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@conference{Airamezani2016cics,
author = {M. Aliramezani and K. Ebrahimi and C. R. Koch and R. E. Hayes},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Waterloo ON},
title = {{NO}x sensor ammonia cross sensitivity analysis using a simplified physic-based model},
pages = {6},
url = {/~ckoch/open_access/Airamezani2016cics.pdf},
abstract = {A simplified physic-based NOx sensor model is developed to remove
ammonia cross sensitivity from production NOx sensors. A linear model
is used to consider the effect of ammonia contamination on the NOx
sensor output signal using a cross sensitivity factor. The effect
of temperature on NOx sensor cross sensitivity to ammonia is then
investigated by simulating NH3 oxidation inside the sensor. The model
considers the effect of temperature on cross sensitivity based on
three global reactions. N2O, NO and NO2 are considered as productions
of NH3 oxidation inside the sensor. Finally, a relation is derived
for cross sensitivity factor in terms of concentration of N2O, NO
and NO2.This model provides a simplified physic-based model for detailed
NOX sensor cross sensitivity analysis.},
groups = {conferences},
month = may,
owner = {ckoch},
timestamp = {2016.04.08},
year = {2016}
}
@conference{Aliramezani2016aac,
author = {M. Aliramezani and C. R. Koch and R. E. Hayes},
booktitle = {IFAC Advances in Automotive Controls Conference (AAC), Sweden},
title = {Estimating tailpipe NOx concentration using a dynamic NOx/ammonia cross sensitivity model coupled to a three state control oriented SCR model},
number = {11},
pages = {8--13},
publisher = {Elsevier},
url = {/~ckoch/open_access/Aliramezani2016aac.pdf},
volume = {49},
abstract = {A dynamic $NO_x$ sensor model is developed to remove ammonia cross
sensitivity from production $NO_x$ sensors mounted downstream of
Diesel-engine selective catalytic reduction (SCR) systems. The model
is validated for large amounts of ammonia slip during different engine
transients. A three-state nonlinear control oriented SCR model is
also developed to predict the $NH_3$ concentration downstream of
the SCR ($NH_3$ slip). $NH_3$ slip is then used as an input for modeling
the cross sensitivity of a production $NO_x$ sensor and calculating
the actual $NO_x$ concentration in the presence of $NH_3$ contamination.
The cross sensitivity is considered to be a function of temperature,
normalized ammonia slip rate (NASR) and time. The validation results
show that the developed model has an acceptable accuracy for the
actual $NO_x$ concentration downstream of the SCR. This model should
be of utility for engine emission control strategies such as SCR
control.},
groups = {conferences},
journal = {IFAC-PapersOnLine},
month = jun,
owner = {ckoch},
timestamp = {2016.01.29},
year = {2016}
}
@conference{Arthur2003,
author = {D. M. Arthur and M. D. Checkel and C. R. Koch},
title = {Developing Hydrogen Infrastructure through near-term intermediate technology},
booktitle = {Hydrogen and Fuel Cells 2003 conference and trade show, Vancouver},
year = {2003},
month = {June},
groups = {conferences},
owner = {ckoch}
}
@conference{Atkins,
author = {M. A. Atkins and C. R. Koch},
booktitle = {SAE Paper 2003-01-0081},
title = {A Well-to-Wheel Comparison of Several Powertrain Technologies},
url = {/~ckoch/open_access/Atkins.pdf},
groups = {conferences},
month = {March},
owner = {ckoch},
year = {2003}
}
@conference{Audet2009sae,
author = {A. Audet and C. R. Koch},
booktitle = {SAE Paper 2009-01-1135},
title = {Actuator comparison for closed loop control of {HCCI} combustion timing},
pages = {8},
url = {/~ckoch/open_access/Audet2009sae.pdf},
abstract = {Homogeneous Charge Compression Ignition (HCCI) is an emerging combustion
technology due to its increased efficiency and decreased \nox emissions.
One of the most challenging aspects of HCCI is the regulation of
the combustion timing. Unlike conventional combustion modes there
is no direct control over the start of combustion. Autoignition timing
is a function of the temperature, pressure and composition of the
mixture, so to adjust the combustion timing of HCCI changes have
to be made to these. Both variable valve timing and variable fuel
octane number are effective inputs to achieve cycle-to-cycle combustion
control of HCCI combustion timing. The application of these control
methods are investigated in this paper. A one-cylinder Ricardo engine
is fitted with a 4-valve spark ignition cylinder head equipped with
camshaft phasers. These phasers independently adjust both the intake
and exhaust camshaft phasing. By modifying the intake valve timing
the effective compression ratio is changed, which affects the temperature-pressure
condition of the mixture. Variable fuel octane is realized using
two independent fuel injector systems, one equipped with iso-Octane
and the other with n-Heptane. The CA50 (crank angle of 50\% mass
fraction burned) is regulated using feedback control and two separate
actuators for combustion timing are implemented; intake camshaft
phasing and variable fuel octane. These actuators are compared according
to their range of operation and ability to reject system disturbances.
The different combustion controllers are subjected to disturbances
of both engine speed and engine load (changes in injected fuel energy).
The results show the benefits and limitations of each actuator.},
groups = {conferences},
owner = {ckoch},
timestamp = {2009.03.31},
year = {2009}
}
@conference{CICS2008a,
author = {A. Audet and C. R. Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
title = {Experimental {HCCI} Cyclic Variations using Camshaft Phasing},
pages = {6},
url = {/~ckoch/open_access/CICS2008a.pdf},
abstract = {The effect of valve timing on cyclic variation of Homogeneous Charge
Compression Ignition (HCCI) combustion is experimentally investigated.
The understanding of the effect engine parameters have on the cyclic
variations of HCCI is needed to control the combustion phasing of
HCCI. Cyclic variation control is necessary since the load range
of HCCI is partially limited by high cyclic variations seen at the
misfire limit. A one-cylinder Ricardo engine with a Mercedes 4-valve
camshaft phasing cylinder head is operated at a constant speed, intake
temperature and intake pressure. Using camshaft phasers the timing
of both the intake and exhaust valves are independently changed at
different levels of engine load and fuel octane number. Phasing the
intake valves primarily effects the effective compression ratio of
the engine, and it is observed that decreasing the effective compression
ratio increases the cyclic variation of the timing of HCCI but has
little effect on the cyclic variation of Indicated Mean Effective
Pressure (IMEP). Phasing of the exhaust valves is used to obtain
negative valve overlap which results in trapped residuals. Increases
in these trapped residuals is seen to effect both cyclic variation
of combustion phasing as well as IMEP mainly through charge temperature.},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2008.03.27},
year = {2008}
}
@conference{CICS2010c,
author = {J. Boddez and D. Checkel. and C. R. Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
title = {{Mode Switiching Development for a Natural Gas SI- HCCI engine}},
pages = {6},
url = {/~ckoch/open_access/CICS2010c.pdf},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2010.04.06},
year = {2010}
}
@conference{CICS2013,
author = {D. Bullock and A. Schramm and A. Momenimovahed and C. R. Koch and J. S. Olfert},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Quebec City, QB},
title = {Effects of Transient Valve Timing on Particulate Emission Concentration of a {Homogeneous Charge Compression Ignition Engine}},
pages = {6},
url = {/~ckoch/open_access/CICS2013.pdf},
abstract = {To quantify the particle emissions from a Homogeneous Charge Compression
Ignition (HCCI) engine, a fast-response differential mobility spectrometer
(DMS) is used during transient operation to measure momentary changes
in particle concentration and size distribution. The DMS has a time
response of 500 ms (10-90% rise time) and a sample rate of 2 Hz is
used while the engine is operated at approximately 820 rpm or 7 cycles/s.
A single cylinder engine with electromagnetic valves is used to test
the effect of changing valve timing on particle emissions. During
steady-state operation of the single cylinder engine at both 60deg
and 180deg of symmetric negative valve overlap (NVO), average particle
emissions of 6.0x10^7 and 5.7x10^7 cm-3 respectively are measured.
These values agree well within error. The geometric mean diameters
(GMD) of both tests are also comparable at 15 nm and 16 nm, respectively.
Particulate emissions are then recorded while switching the valve
timing between 60deg and 180deg NVO in order to see the effect of a change
in engine operating conditions. An order of magnitude increase in
particle concentration coincides with the valve timing changes. These
concentration spikes range from 1 x10^8 to 3 x108 cm-3. This variability
is attributed to the time response limitation of the DMS causing
some samples to be taken during the first cycle after the valve timing
change versus some being taken during subsequent cycles. After a
spike in particle concentration due to a timing change, the value
quickly returns to steady-state levels. The GMD remains at 15 nm
throughout the test, suggesting that while the particle concentration
increases due to timing changes, the mechanism for particle formation
does not change.},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2013.05.02},
year = {2013}
}
@conference{Buss_2011,
author = {M. Bussiere and D. Nobes and C. R. Koch},
booktitle = {23rd Canadian Congress of Applied Mechanics},
title = {The oscillatory behavior of a symmetric airfoil hinged at its aerodynamic centre in the wake of a circular cylinder},
note = {CANCAM 2011},
pages = {5},
url = {/~ckoch/open_access/Buss_2011.pdf},
abstract = {A NACA 0012 airfoil free to rotate about its aerodynamic center is
placed in the wake of a circular cylinder. The cylinder produces
a periodic pattern of swirling vortices which cause pressure fluctuations
across the airfoil and ultimately cause it to oscillate in a sustained
periodic manner. This oscillatory behavior is characterized by the
oscillation amplitude and frequency as well as the amplitude and
frequency of pressure fluctuations measured on either side of the
airfoil. How these characteristics vary with distance along the center
of the cylinder wake is described.},
groups = {conferences},
month = {June},
owner = {ckoch},
timestamp = {2011.07.14},
year = {2011}
}
@conference{Buss_2012,
author = {M. Bussiere and D. S. Nobes and C. R. Koch},
booktitle = {16th Int Symp on Applications of Laser Techniques to Fluid Mechanics},
title = {A Combinatorial vortex detection and characterization algorithm for {2C2D} {PIV} data},
note = {Lisbon 2012},
pages = {5},
url = {/~ckoch/open_access/Buss_2012.pdf},
abstract = {In this study, the vortical wake conditions of water flowing past
an oscillating symmetric airfoil are described with velocity vector
fields obtained from particle image velocimetry (PIV) data. Vortices
are identified and characterized with a combinatorial algorithm and
were found to agree well with the Burgers vortex model. Velocity
vector fields obtained experimentally are often accompanied by undesirable
effects which are not present in numerical data. The algorithm overcomes
these limitations in the data sets by making use of three separate
detection methods to provide dependable vortex detection in a wide
range of wake conditions.},
groups = {conferences},
month = {July},
owner = {ckoch},
timestamp = {2012.08.25},
year = {2012}
}
@conference{Kerry-aaar-2016,
author = {K. Chen and C. R. Koch and J. S. Olfert},
title = {Development of a Universal Aerosol Conditioning Device for Particle Measurement.},
booktitle = {35th Annual American Association for Aerosol Research Conference},
year = {2016},
address = {Portland, Oregon, Oct 17--21},
groups = {conferences},
owner = {ckoch},
timestamp = {2017-02-28}
}
@conference{Chladny2006,
author = {R. R. Chladny and C. R. Koch},
booktitle = {IEEE International Conference on Control Applications, Munich, Germany},
title = {Flatness-Based Tracking of an Electromechanical {VVT} actuator with magnetic flux sensor},
pages = {1663 to 1668},
url = {/~ckoch/open_access/Chladny2006.pdf},
abstract = {A flatness-based end controller of an automotive solenoid valve has
been demonstrated in both simulation and on an actuator test-bench.
The simulation model provides an accurate representation of the real
system and allows for the development of control strategies. The
simulation results are contrasted with those of an actuator test-bench
equipped with 42 volt automotive solenoid valves and a pressure chamber
to simulate valve opening with exhaust gas pressures. A flux-based
sensor which is suitable for real engine operation is used for position
estimation in the soft-landing control.},
groups = {conferences},
keywords = {engines, solenoids, nonlinear control, modeling, magnetic field measurement},
month = {October},
owner = {ckoch},
year = {2006}
}
@conference{Chladny2006a,
author = {R. R. Chladny and C. R. Koch},
booktitle = {2006 American Controls Conference (ACC), Minneapolois, MN, USA. Received Best Paper in Session award.},
title = {Magnetic Flux-Based Position Sensor for Control of an Electromechanical {VVT} Actuator},
pages = {3979 to 3984},
url = {/~ckoch/open_access/Chladny2006a.pdf},
abstract = {A promising method for enhancing automotive internal combustion engine
efficiency uses solenoid actuators to directly control gas exchange
valves. Mitigation of valve seating velocities is challenging due
to phenomena such as magnetic saturation and pressure disturbances.
Production implementation of an electromagnetic valvetrain will require
the development of cost effective yet accurate sensors for robust
feedback control. A method of magnetic flux-based armature position
measurement is presented. Also provided is an overview of the modeling,
control design, and experimental and simulated results acquired to
date using such a sensor configuration.},
groups = {conferences},
month = {June},
owner = {ckoch},
year = {2006}
}
@conference{Ebrahimi2016aac,
author = {K. Ebrahimi and M. Aliramezani and C. R. Koch},
booktitle = {IFAC Advances in Automotive Controls Conference (AAC), Sweden},
title = {An HCCI Control Oriented Model that Includes Combustion Efficiency},
number = {11},
pages = {327--332},
publisher = {Elsevier},
url = {/~ckoch/open_access/Ebrahimi2016aac.pdf},
volume = {49},
abstract = {A control oriented model that includes combustion timing, engine load
and combustion efficiency for Homogeneous Charge Compression Ignition
(HCCI) engines is developed. In HCCI engines, a lean homogeneous
air-fuel mixture auto-ignites due to compression and combustion occurs
at lower temperatures compared to spark ignition and diesel engines.
The low HCCI combustion temperature results in low $\mathrm{NO_X}$
level, however unburnt HC and CO levels are high. Higher thermal
efficiencies are realized for higher combustion efficiencies when
combustion timings is appropriate. First, the effects of valve timing
and fueling rate on combustion efficiency are investigated experimentally.
Then, the influence of combustion efficiency on HC and CO emissions
is studied. A physics based control oriented model of HCCI engine
combustion efficiency and emission for future control design is developed.
This model includes the effect of trapped residual gas and fueling
rate on combustion timing and output power. The developed model has
acceptable accuracy for combustion timing, load and combustion efficiency
prediction compared to experimental data. This model is useful for
combustion timing and load control in HCCI engines while simultaneously
considering the constraints of combustion efficiency and emission.},
groups = {conferences},
journal = {IFAC-PapersOnLine},
month = {June},
owner = {ckoch},
timestamp = {2016.01.29},
year = {2016}
}
@conference{Ebrahimi2015_sae,
author = {K. Ebrahimi and C. R. Koch},
booktitle = {SAE Paper 2015-01-0822},
title = {Model Predictive Control for Combustion Timing and Load Control in {HCCI} engines},
pages = {15},
url = {/~ckoch/open_access/Ebrahimi2015_sae.pdf},
abstract = {A Model Predictive Control (MPC) strategy for Homogeneous Charge Compression
Ignition (HCCI) combustion timing and output work control that takes
into account actuator constraints is designed. The MPC is based on
the linearized version of a nonlinear Control Oriented Model (COM).
The COM for the HCCI engine has combustion timing and engine load
as outputs and valve timing and fueling rate as the the inputs.The
COM model is developed and validated and found to be accurate enough
for control purposes and can be implemented in real-time. A Detailed
Physical Model (DPM) is used to test the controller using the valve
timing and fueling rate as constrained actuators. Constraints on
combustion timing and output work are also considered to prevent
engine knock or misfire. The simulation results show that the developed
controller works over a range of conditions and can maintain HCCI
combustion timing and load in their desired values.},
groups = {conferences},
owner = {ckoch},
timestamp = {2015.04.19},
year = {2015}
}
@conference{Ebrahimi_acc2018,
author = {K. Ebrahimi and C. R. Koch},
booktitle = {2018 American Controls Conference (ACC), Milwakee, USA},
title = {Real-time Control of {HCCI} Engine Using Model Predictive Control},
pages = {1622-1628},
url = {/~ckoch/open_access/Ebrahimi_acc2018.pdf},
groups = {conferences},
month = {June},
owner = {ckoch},
timestamp = {2018-07-01},
year = {2018}
}
@conference{CICS2014,
author = {K. Ebrahimi and A. Schramm and C. R. Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Windsor, ON},
title = {Effects of Asymmetric Valve Timing with Constant {NVO} Duration on {HCCI} Engine Combustion Characteristics},
pages = {6},
url = {/~ckoch/open_access/CICS2014.pdf},
abstract = {Homogeneous Charge Compression Ignition (HCCI) engine combustion characteristics
are investigated by changing the amount of trapped residual gas and
compression ratio cycle-by-cycle by keeping the Negative Valve Overlap
(NVO) duration constant and only varying the Exhaust Valve Closing
(EVC) and Intake Valve Opening (IVO) timings. Three different NVO
durations are tested. Rate of heat release, which is calculated from
the in-cylinder pressure trace, and the exhaust gas emission measurements
information are used to examine the HCCI engine combustion features.
Combustion timing and burn duration are significantly affected by
the level of trapped residual gas with this valve timing strategy.
The measurements indicate that fuel efficiency, output torque and
Indicated Mean Effective Pressure (IMEP) are improved when IVO and
EVC timings are advanced simultaneously with constant NVO duration.
CO concentration is reduced with the retarded EVC and IVO timings
while CO2 concentration reaches its minimum with symmetric NVO.},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2014.04.23},
year = {2014}
}
@conference{Ebrahimi_acc2014,
author = {K. Ebrahimi and Alexander Schramm and C. R. Koch},
booktitle = {2014 American Controls Conference (ACC), Portland, USA},
title = {Feedforward/Feedback Control of {HCCI} combustion timing},
pages = {6},
url = {/~ckoch/open_access/Ebrahimi_acc2014.pdf},
abstract = {Homogeneous Charge Compression Ignition (HCCI) engines have the advantage
of low Nitrogen Oxides ($NO_x$) and soot emissions. In HCCI engines,
a lean premixed air-fuel mixture is compressed until the temperature
is high enough for combustion to occur. HCCI engines have a limited
operating range and are limited by knock at high loads and misfire
at low loads. They are without a direct source to initiate ignition
so HCCI requires combustion timing control. Some of the factors that
affect HCCI combustion timing are mixture composition, pressure and
temperature at the time of inlet valve closing. One effective way
to control HCCI combustion timing is Variable Valve Timing (VVT).
VVT changes the amount of trapped residual gas and the effective
compression ratio. These factors have a strong effect on HCCI combustion
timing. One main advantage of VVT is that it is fast enough to handle
rapid transients. Based on a simplified control oriented model that
models the effect of trapped residual gas on combustion timing, a
Feedforward/Feedback controller is designed for HCCI combustion timing
control . The controller requires feedforward information of the
valve timing and feedback information of the combustion timing. This
controller tracks the desired combustion timing trajectory both in
simulation and experiment by modulating the trapped residual gas
using VVT actuation.},
groups = {conferences},
month = {June},
owner = {ckoch},
timestamp = {2014.06.10},
year = {2014}
}
@conference{Ebrahimi2013_sae,
author = {K. Ebrahimi and A. Schramm and C. R. Koch},
booktitle = {SAE Paper 2013-01-0588},
title = {A Control Oriented Model with Variable Valve Timing for {HCCI} Combustion Timing Control},
pages = {12},
url = {/~ckoch/open_access/Ebrahimi2013_sae.pdf},
abstract = {Homogeneous Charge Compression Ignition (HCCI) is a promising concept
for combustion engines to reduce both emissions and fuel consumption.
HCCI combustion control is a challenging issue because there is no
direct initiator of combustion. Variable Valve Timing (VVT) is being
used in SI engines to improve engine efficiency. When VVT is used
in conjunction with HCCI combustion it is an effective way to control
the start of combustion. VVT changes the amount of trapped residual
gas and the effective compression ratio for each cycle both of which
have a strong effect on combustion timing in HCCI engines. To control
HCCI combustion, a physics based control oriented model is developed
that includes the effect of trapped residual gas on combustion timing.
The control oriented model is obtained by taking a physics based
model of the reaction kinetics and transient dynamics and systematically
reducing the model using simplification of reaction mechanisms. This
method allows different fuels to be incorporated using a standard
methodology. The reduced order model consists of these five stages:
intake, compression, combustion, expansion and exhaust. This model
fills the gap between complex models with highly detailed chemical
kinetics and simple black box dynamic models that have been used
in model based control.},
groups = {conferences},
owner = {ckoch},
timestamp = {2013.01.23},
year = {2013}
}
@conference{CICS2011b,
author = {K. Ebrahimi and M. Shahbakhti and C. R. Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
title = {Comparison of Butanol/n-Heptane as a Blended fuel in an {HCCI} engines},
pages = {6},
url = {/~ckoch/open_access/CICS2011b.pdf},
abstract = {Butanol and n-heptane fuel blends are compared to Primary Reference
Fuel blends of iso-octane and n-heptane by measuring 98 steady-state
HCCI combustion operating points. The volume percentage of the blended
fuel with n-heptane and fuel equivalence ratio are varied while all
other engine parameters are held constant. The experimental results
show that HCCI operation is possible with Butanol blends up to 48.5%
and with iso-octane blends up to 63%. Higher indicated thermal efficiencies
when running the engine on blends of butanol are obtained compared
to the PRF blends and the Butanol blends have a later start of combustion
and a slower rate of heat release compared to the PRF blends. Operating
points that have the same thermal efficiency but a lower volume percent
of butanol compared to iso-octane have been found and this could
be an advantage since a smaller amount of secondary fuel would be
required.},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2010.03.01},
year = {2011}
}
@conference{CICS2008b,
author = {A. Ghazimirsaied and M. Shahbakhti and A. Audet and C. R. Koch},
title = {Characterizing Cyclic Variations in an {HCCI} Engine using Chaotic and Statistical Methods},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
year = {2008},
month = {May},
pages = {6},
abstract = {This paper investigates the cyclic variation of ignition timing in
an Homogeneous Charge Compression Ignition (HCCI) engine using a
range of experimental data collected from a single-cylinder Ricardo
engine. Under certain operating conditions, HCCI engines can exhibit
large cyclic variations in ignition timing. Cyclic variability ranging
from stochastic to deterministic patterns can be observed. This work
applies two methods to study patterns of CA50 (Crank angle of 50\%
fuel burnt) cyclic variation in an HCCI engine. Nine points ranging
from the misfire to knock limit within the HCCI mode are experimentally
measured by varying the intake manifold temperature. The return map
techniques used in nonlinear dynamics and chaos theory are applied
to observe possible deterministic structures inherent in these points.
Probability distribution for cyclic combustion timing is the second
approach examined. Experimental data of 338 different points over
a wide range of operating conditions are examined to find out the
conditions where a normal distribution for CA50 is observed. Three
common statistical testing methods are used to verify the hypothesis
of having a normal distribution for each data point.},
groups = {conferences},
owner = {ckoch},
timestamp = {2008.03.27}
}
@conference{CICS2011a,
author = {A. Ghazimirsaied and M. Shahbakhti and C. R. Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
title = {Ignition timing criteria for partial burn operation in an {HCCI} engine},
pages = {6},
url = {/~ckoch/open_access/CICS2011a.pdf},
abstract = {Homogeneous Charge Compression Ignition (HCCI) has the potential to
improve the efficiency of Spark Ignition (SI) or Compression Ignition
(CI) engines particularly at part load near the partial burn/misfire
limit. Two challenges of HCCI combustion are: maintaining constant
ignition timing despite no direct mechanism to initiate combustion,
and to expand the part load region of HCCI near the misfire limit.
An accurate criteria of ignition timing is critical to accomplish
this. The crank angle where the maximum pressure occurs (ThetaPmax)
is proposed as a robust criteria for distinguishing between normal
and misfire HCCI combustion modes. Particularly near the partial
burn/misfire limit, this method is found to be more reliable than
the existing methods of CA50 (Crank angle of 50 percent mass fraction
burned). Using (ThetaPmax), normal and partial burn engine cycles
can be determined cycle by cycle for fuels exhibiting a cool flame.
The performance of this new criteria is then analyzed for different
engine loads at both constant fueling and constant equivalence ratio
at 329 HCCI experimental operating points, each with 100 cycles of
cylinder pressure data. For operating points with high cyclic variation
ThetaPmax is found to be more reliable than CA50. Thus ThetaPmax
could be used in future feedback algorithms to help control to stabilize
ignition timing in these regions extending the useful operating range
of HCCI.},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2010.03.01},
year = {2011}
}
@conference{CICS2010a,
author = {A. Ghazimirsaied and M. Shahbakhti and C. R. Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
title = {{Recognizing partial burn operation in an HCCI engine}},
pages = {6},
url = {/~ckoch/open_access/CICS2010a.pdf},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2010.03.01},
year = {2010}
}
@conference{CICS2009b,
author = {A. Ghazimirsaied and M. Shahbakhti and C. R. Koch},
title = {Partial-burn crankangle limit criteria comparison on an experimental {HCCI} engine},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
year = {2009},
month = {May},
pages = {6},
abstract = {Misfire and partial-burn criteria are defined using crank angle based
engine parameters and investigated on an experimental Homogeneous
charge compression ignition (HCCI) single-cylinder engine at 59 operating
conditions. The best criteria to distinguish between normal, partial
burn and misfire operating conditions for this engine are: the standard
deviation of CA10 (Crank angle at which 10 percent of fuel mass has
burned) and burn duration. The partial burn limit for five different
blends of isooctane and n-heptane fuels is presented. Increasing
the manifold pressure at each specific fuel octane number results
in a lower equivalence ratio partial burn limit for the engine operating
points tested},
groups = {conferences},
owner = {ckoch},
timestamp = {2009.03.31}
}
@conference{Ghazi_ices09,
author = {A. Ghazimirsaiied and M. Shahbakhti and C. R. Koch},
booktitle = {ASME 2009 Int. Comb. Engine Conf., Milwwaukee, USA},
title = {Nonlinear Dynamics in Cyclic Variations of Combustion Phasing in an {HCCI} Engine},
pages = {8},
url = {/~ckoch/open_access/Ghazi_ices09.pdf},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2008.11.21},
year = {2009}
}
@conference{ICUAS2013,
author = {Sepehr P Khaligh and Alex Martinez and Farbod Fahimi and Charles Robert Koch},
booktitle = {Int. Conf. on Unmanned Aircraft Systems},
title = {A {HIL} Testbed for Small Unmanned Helicopter's Initial Controller Gain Tuning},
pages = {8},
url = {/~ckoch/open_access/ICUAS2013.pdf},
abstract = {A Hardware-In-The-Loop (HIL) testbed design for small unmanned helicopters
is described. The testbed provides a safe and low-cost platform to
implement control algorithms and tune the control gains in a controlled
environment. Specifically, it allows for testing the robustness of
the controller to external disturbances by emulating the hover condition.
A 6-DOF nonlinear mathematical model of the helicopter has been validated
in real flight tests. This model is implemented in real-time to estimates
the states of the helicopter which are then used to determine the
actual control signals on the testbed. A damping system with a negligible
parasitic effect on the dynamics of the helicopter around hover is
incorporated into the testbed design to minimize the structural stress
on the fuselage in the case of controller failure or a subsystem
malfunction. Three experiments including the longitudinal, lateral
and heading control tests are performed. Experimental results show
that the HIL testbed allows for designing a controller which is robust
to the external disturbances, and achieves an accuracy of +-2cm in
the position control along the longitudinal and lateral axes in hover,
and that of +-1 deg around the yaw axis on the heading trajectory
tracking.},
groups = {conferences},
owner = {ckoch},
timestamp = {2013.05.07},
year = {2013}
}
@conference{Koch2002,
author = {C. R. Koch and A. F. Lynch and R. R. Chladny},
title = {Modeling and control of solenoid valves for internal combustion engines},
booktitle = {Proc. of the 2nd IFAC Conference on Mechatronic Systems, Berkeley, CA.},
year = {2002},
month = {December},
abstract = {This paper considers the modeling and control of solenoid valve actuators
used for gas exchange in internal combustion engines. Solenoid valves
are an emerging technology which offers performance benefits over
traditional camshaft based valve timing. Maintaining the impact velocity
of the armature and valve is a primary performance requirement in
order to minimize acoustic noise and mechanical wear. To control
this velocity, the finite element method (FEM) is used to generate
static force and flux data which is validated experimentally. A flatness-based
control provides linear tracking error dynamics assuming current
control. A reduced-order nonlinear velocity/disturbance observer
ensures linear estimate error dynamics for constant force disturbances.
The estimated state feedback is simulated using the FEM model flux
and force data and acceptable impact velocity and acceleration are
achieved in face of model uncertainty disturbance.},
groups = {conferences},
keywords = {Electromagnetic Devices, Valves, Finite Element Method, Internal Combustion Engines, Nonlinear Control, State Observers, Feedforward Compensation},
owner = {ckoch}
}
@conference{Koch2004,
author = {C. R. Koch and A. F. Lynch and S. K. Chung},
title = {Flatness-based automotive solenoid valve control},
booktitle = {Proc. of Nonlinear Control Systems Stuttgart Germany, Elsevier Science},
year = {2004},
month = {September},
pages = {1091 -1096},
abstract = {This paper considers the control of solenoid valve actuators used
for gas exchange in internal combustion engines. Solenoid valves
offer performance benefits over traditional camshaft-based valve
timing. Maintaining the impact velocity of the armature and valve
is an important performance specification. Flatness-based control
provides linear stable tracking error dynamics assuming voltage control.
In order to incorporate voltage constraints, magnetic saturation,
and to ensure an appropriate position-velocity-acceleration profile,
the flat output is parameterized with a spline basis. Non-linear
programming is used to obtain optimal spline coefficients for the
flat output trajectory.},
groups = {conferences},
keywords = {Nonlinear Control, Feedback Linearization, Feedforward Compensation, Electromagnetic Devices, Internal Combustion Engines},
owner = {ckoch}
}
@conference{Lynch2003,
author = {A. F. Lynch and C. R. Koch},
title = {Control of Precision Electromagnetic Actuators: Active Magnetic Bearings and Solenoid Valve Actuators},
booktitle = {Proceedings of the Second CSME Biennial Symposium on Mechatronics, Calgary AB},
year = {2003},
month = {June},
groups = {conferences},
owner = {ckoch}
}
@conference{CICS2007b,
author = {M.Shahbakhti and R. Lupul and A. Audet and C. R. Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
title = {Experimental Study of {HCCI} Cyclic Variations for Low-Octane {PRF} Fuel Blends},
pages = {6},
url = {/~ckoch/open_access/CICS2007b.pdf},
abstract = {The operating range of Homogeneous Charge Compression Ignition (HCCI)
engines is limited by the knock boundary on one side and by high
cyclic variations (misfire) on the other side. A challenging problem
for HCCI engines is achieving cycle-by-cycle ignition control due
to these variations. To control combustion in HCCI engines, it is
essential to understand how parameters affect the cyclic variations
of HCCI combustion. This paper investigates cyclic variability of
HCCI combustion using experimental data collected at 360 operating
points from a single cylinder Ricardo engine. The engine is fueled
with four different blends of Primary Reference Fuels PRFs (iso-octane
and nheptane) at octane values of 0, 10, 20 and 40 over a wide range
of equivalence ratios, intake temperatures, intake pressures, Exhaust
Gas Recirculation (EGR) rates, and engine speeds. The experimental
results show there are three main distinct patterns of cyclic variations
for combustion peak pressure (Pmax), Indicated Mean Effective Pressure
(IMEP) and ignition timing. These patterns include normal cyclic
variations, periodic cyclic variations and cyclic variations with
weak/misfired ignitions. The results also show cyclic variation of
HCCI combustion is highly dependant on the location of the start
of combustion and there is less cyclic variation in the first stage
of HCCI combustion compared to that of the second stage for the PRF
blends studied.},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2007.03.16},
year = {2007}
}
@conference{ICEF2011,
author = {Masoud Mashkournia and Adrian Audet and Charles Robert Koch},
booktitle = {Proceedings of the ASME 2011 Dynamic Systems and Control Conference, Morgantown, USA},
title = {Knock detection and control in an {HCCI} engine using {DWT}},
doi = {10.1115/ICEF2011-60076},
pages = {391-399},
publisher = {ASME},
url = {/~ckoch/open_access/ICEF2011.pdf},
abstract = {The novel application of the Discrete Wavelet Transform (DWT) in a
real time controller is used to detect and subsequently control knock
in a Homogeneous Charge Compression Ignition (HCCI) engine. Classical
Fourier techniques for knock detection are discussed and compared
to Wavelet Transforms. The Discrete Wavelet Transform filter bank
is chosen as the best method for knock detection due to its good
time-resolution and low computational requirements. The DWT method
is compared with the root mean squared value of the pressure trace
as the benchmark method for determining knock and the two methods
are linearly correlated. Using the DWT method for knock detection
and modulating fuel octane, both a Proportional Integral (PI) and
PI with Feed-forward control are implemented. Both of these methods
reduce knock intensity for a step increase in engine load. The combination
of Feed-forward with PI feedback is found to be slightly more effective
than just PI feedback control.},
groups = {conferences},
owner = {ckoch},
timestamp = {2011.04.04},
year = {2011}
}
@conference{CICS2012,
author = {M. Mashkournia and C. R. Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Toronto, ON},
title = {Cycle by Cycle Actuation of Intake Valve Closing in {HCCI}},
pages = {6},
url = {/~ckoch/open_access/CICS2012.pdf},
abstract = {Homogeneous Charge Compression Ignition (HCCI) has the potential to
improve automobile efficiency in part load operation. However, challenges
of limited operating range as well as difficulty in mode switching
from spark ignition to HCCI limit the practical use of HCCI technology.
One system that shows promise for fast actuation and control of HCCI
is fully variable valve timing. A fully variable electromagnetic
valve timing system has been installed on a single cylinder research
engine. Running in HCCI, the intake valve closing event is switched
cycle by cycle between 180 degrees before top dead center (bTDC)
to early valve closing during the intake stroke at 230 degrees bTDC
in order to modify the effective compression ratio. A return map
of the combustion timing for each cycle indicates deterministic ignition
timing when cycling between these two operating points. Each operating
point at steady state is then compared to the switched case by examining
the return map, IMEP and maximum pressure rise rate.},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2012.04.21},
year = {2012}
}
@conference{Hadi_asme_2014,
author = {Nazaripoor, H. and Koch, Charles R. and Bhattacharjee, Subir},
booktitle = {ASME Int Conf. Montreal Ca},
title = {Dynamics Of Thin Liquid Bilayers Subjected To An External Electric Field},
number = {1},
pages = {7},
url = {/~ckoch/open_access/Hadi_asme_2014.pdf},
abstract = {Spatiotemporal evolution of liquid-liquid interface leading to dewetting
and pattern formation is investigated for thin liquid bilayeres subjected
to the long range electrostatic force and the short range van der
Waals forces. Based on the 2D weakly non-linear thin film equation
three dimensional structure evolution is numerically simulated. A
combined finite difference for the spatial dimensions and an adaptive
time step ODE solver is used to solve the governing equation. For
initially non-wetting surfaces, the stabilizing effects of viscosity
and interfacial tension and the destabilizing effect of the Hamaker
constant are investigated. Electrostatic interaction is calculated
analytically for both perfect dielectric-perfect dielectric and ionic
conductive-perfect dielectric bilayers. Ionic conductive-perfect
dielectric bi-layers based on the electric permittivity ratio of
layers are found to be stabilized or deformed in response to the
applied externalelectric field.},
groups = {conferences},
month = nov,
owner = {ckoch},
timestamp = {2014.12.14},
year = {2014}
}
@conference{Buss_2015,
author = {D. S. Nobes and M. Bussiere and C. R. Koch},
booktitle = {10th Pacific Symp on Flow Visualization and Image Processing},
title = {The Vortex Field Behind A Single And Tandem Flapping Airfoil},
note = {Naples},
pages = {19},
url = {/~ckoch/open_access/Buss_2015.pdf},
groups = {conferences},
month = {June},
owner = {ckoch},
timestamp = {2015.04.26},
year = {2015}
}
@conference{Setayesgar_2012,
author = {D. S. Nobes and A. Setayeshgar and M. G. Lipsett and C. R. Koch},
title = {Investigating the Particles Motion in Ultrasonic Acoustic Wave Field Using {PIV/PTV}},
booktitle = {International Congress on Ultrasonics, Poland},
year = {2012},
volume = {1433},
publisher = {AIP},
month = sep,
pages = {719-722},
doi = {http://dx.doi.org/10.1063/1.3703283},
url = {http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.3703283},
groups = {conferences},
owner = {ckoch},
timestamp = {2011.08.12}
}
@conference{Setayesgar_2011,
author = {D. S. Nobes and A. Setayeshgar and M. G. Lipsett and C. R. Koch},
booktitle = {International Congress on Ultrasonics, Poland},
title = {Investigating the Particles Motion in Ultrasonic Acoustic Wave Field Using {PIV/PTV}},
pages = {4},
publisher = {AIP},
url = {/~ckoch/open_access/Setayesgar_2011.pdf},
groups = {conferences},
month = sep,
owner = {ckoch},
timestamp = {2011.08.12},
year = {2011}
}
@conference{Sabbagh_asme_2014,
author = {Sabbagh, R. and Lipsett, M. G. and Koch, Charles R. and Nobes, David S.},
booktitle = {ASME Int Conf. Montreal Ca},
title = {Theoretical And Experimental Study Of Hydrocyclone Performance And Equivalent Settling Area},
note = {IMECE2014-37482},
number = {1},
url = {/~ckoch/open_access/Sabbagh_asme_2014.pdf},
abstract = {Predicting the performance of a solid-liquid separation process can
help in comparing different separators for selection and design.
This can be applied to hydrocyclone technology which is used widely
in industry due to being an inexpensive device that is easy to operate
and maintain and which has no moving parts. Environmental concerns
and technological issues in separation processes are motivating the
design of higher ?efficiency systems with less capital and operating
costs. There is a need therefore for, methods to compare different
?separation technologies. In spite of extensive research into hydrocyclone
performance, a mathematical model that can predict the performance
of a hydrocyclone for comparison with other centrifugal separators
is rare in the literature. The main objective of this research is
to apply theoretical and ?experimental approaches to study hydrocyclone
performance ?in order to propose an applicable separation performance
?model that represents the whole hydrocyclone operating range. A
mathematical model is developed to explore the performance of the
separator and to predict the hydrocyclone's equivalent area as compared
to a continuous gravity settling tank. A performance chart that can
be used for selection and design of hydrocyclones is the result of
the model.},
groups = {conferences},
month = nov,
owner = {ckoch},
timestamp = {2014.04.13},
year = {2014}
}
@conference{Sabbagh_FPS_2014,
author = {R. Sabbagh and M. G. Lipsett and C. R. Koch and D. S. Nobes},
title = {Hydrocyclone Performance Comparison under the influence of underflow pumping},
pages = {2},
url = {/~ckoch/open_access/Sabbagh_FPS_2014.pdf},
abstract = {A mathematical model is developed to predict the performance of hydrocyclones
for solid-liquid separation. This model is based on residence time
theory combined with estimation of average vertical velocity according
to locus of zero vertical velocity resulted from equilibrium orbit
theory for hydrocyclones. The tangential velocity component is also
related to that radial distance of inlet particle from the hydrocyclone
centerline. This mathematical model is then used to develop the equivalent
area factor that indicates the area of a gravity settling time with
the same separation performance as in the hydrocyclone. A performance
chart is developed from the model and is compared with literature.
It is shown that the chart obtained in the current study is in good
agreement with experimental data. This performance chart can be used
now as a guideline for selecting and design of hydrocyclones. An
experimental setup is also designed for validating the model and
resulted chart.},
groups = {conferences},
journal = {European Conference on Fluid-Particle Separation (FPS) October 2014, Lyon, Fr},
owner = {ckoch},
timestamp = {2014.10.15},
year = {2014}
}
@conference{Setthaler2013sae,
author = {R. Seethaler and M. Mashkournia and R. R. Chladny and J. Zhao and C. R. Koch},
booktitle = {SAE Paper 2013-01-0594},
title = {Closed Loop Electromagnetic Valve Actuation Motion Control on a Single Cylinder Engine},
pages = {8},
url = {/~ckoch/open_access/Setthaler2013sae.pdf},
abstract = {In an effort to improve the efficiency of internal combustion engines,
much focus has been put into variable valve actuation technologies
in recent years. Electromagnetic solenoid valves can provide the
cycle-by-cycle flexible valve timing needed for throttleless engine
control or high efficiency combustion modes such as Homogeneous Charge
Compression Ignition. One challenge with electromagnetic solenoid
intake and exhaust valves is the robust control of the motion to
achieve smooth landing under a variety of operating conditions. Promising
algorithms have been demonstrated under test-bench conditions, but
no work to date has demonstrated a robust electromagnetic valve-train
on a functional engine that also satisfies soft landing and transition
timing criteria. In this work, two previously developed valve motion
controllers are experimentally tested on a single cylinder test engine.
The controllers are compared for the opening transition of the exhaust
valve with large variations in combustion pressure. A new control
algorithm that combines favorable aspects of both methods is also
presented. The new algorithm is shown to operate reliably under a
wide range of operating conditions. An analysis indicates that the
electrical energy consumed by the camless valve system is comparable
to that of an equivalent conventional low friction cam-based valve
train.},
groups = {conferences},
owner = {ckoch},
timestamp = {2013.01.23},
year = {2013}
}
@conference{Setayesgar_2013,
author = {A. Setayeshgar and M. G. Lipsett and C. R. Koch and D. S. Nobes},
booktitle = {10th International Symposium on Particle Image Velocimitry, Delft Ntherlands, 2-4 July},
title = {Measurement of particle dynamics in a coherent acoustic field},
pages = {2},
url = {/~ckoch/open_access/Setayesgar_2013.pdf},
abstract = {A variety of forces can be used to separate fine particles from water
in industrial processes. A coherent standing acoustic field can apply
a pressure difference across a small particle such that the particle
is forced to nodes or anti-nodes in the field depending on particle/liquid
properties. The motion of an individual particle which is a result
of the balance of forces on the particle, including particle-to-particle
interaction is of interest. This study develops a method to measure
individual particle motion using a particle tracking velocimetry
(PTV) approach. These results are aimed to investigate the effects
of particle loading and are used to test the current theory which
only addresses single particle motion in a standing acoustic field.
This paper focuses on the application and validation of a PTV-based
experiential measurement technique used to determine the forces applied
on individual particles.},
groups = {conferences},
owner = {ckoch},
timestamp = {2013.07.19},
year = {2013}
}
@conference{CICS2010b,
author = {M. Shahbakhti and A. Ghazimirsaied and A. Audet and C. R. Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
title = {Combustion characteristics of bio-Butanol/n-Heptane blend fuels in an {HCCI} engine},
pages = {6},
url = {/~ckoch/open_access/CICS2010b.pdf},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2010.03.01},
year = {2010}
}
@conference{DSCC_2011,
author = {M. Shahbakhti and A. Ghazimirsaied and C. R. Koch},
booktitle = {Proceedings of the ASME 2011 Dynamic Systems and Control Conference},
title = {Modeling Ranges Of Cyclic Variability For {HCCI} Ignition Timing Control},
pages = {8},
url = {/~ckoch/open_access/DSCC_2011.pdf},
groups = {conferences},
month = nov,
owner = {ckoch},
timestamp = {2012.04.21},
year = {2011}
}
@conference{CICS2009a,
author = {M. Shahbakhti and A. Ghazimirsaied and C. R. Koch},
title = {The Effect of Operating Conditions on {HCCI} Exhaust Gas Temperature},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
year = {2009},
month = {May},
pages = {6},
abstract = {To successfully use an exhaust aftertreatment system to overcome high
HC and CO emissions in Homogeneous Charge Compression Ignition (HCCI)
engines requires high exhaust gas temperatures for oxidation catalysts.
Low exhaust gas temperature in certain HCCI conditions is a limiting
factor to obtain a large desirable operating range in HCCI engines.
This paper investigates the influence of combustion chamber charge
conditions on the exhaust gas temperature in a single cylinder experimental
engine at over 160 operating points. For the conditions tested, more
than half of the collected data exhibits an exhaust gas temperature
below 300$^\circ$C which is below the light-off temperature of typical
catalytic converters in the market. Location of ignition timing is
found as a main factor to influence HCCI exhaust gas temperature.
HCCI combustion occurring immediately after TDC indicates a lower
exhaust temperature compared to the HCCI combustion that occurs late
after TDC. HCCI ignition timing also influences HC and CO and NOx
emissions and advancing ignition towards TDC causes lower HC and
CO but higher NOx emissions. In addition, results at a constant load
condition indicate longer burn duration and higher fueling rate in
Spark Ignition (SI) mode lead to have higher exhaust gas temperature
in SI mode comparing to that of HCCI mode.},
groups = {conferences},
owner = {ckoch},
timestamp = {2009.03.31}
}
@conference{Shahbakhti_ices09,
author = {M. Shahbakhti and C. R. Koch},
title = {Predicting the Distribution of Combustion Timing Ensemble in an {HCCI} Engine},
booktitle = {ICES2009 Paper},
year = {2009},
month = {May},
pages = {12},
groups = {conferences},
owner = {ckoch},
timestamp = {2008.09.12}
}
@conference{Shahbakhti2009sae,
author = {M. Shahbakhti and C. R. Koch},
title = {Dynamic Modeling of {HCCI} Combustion Timing in Transient Fueling Operation},
booktitle = {SAE Paper 2009-01-1136},
year = {2009},
month = {April},
pages = {16},
abstract = {A physics-based control-oriented model is developed to dynamically
predict cycle-to-cycle combustion timing in transient fueling conditions
for Homogeneous Charge Compression Ignition (HCCI) engines. The model
simulates the engine cycle from the intake stroke to the exhaust
stroke and includes the thermal coupling dynamics caused by the residual
gases from one cycle to the next cycle. A residual gas model, a modified
knock integral model, a fuel burn rate model, and thermodynamic models
for the gas state in combustion and exhaust strokes are incorporated
to simulate the engine cycle. The gas exchange process, generated
work and completeness of combustion are predicted using semi-empirical
correlations. The resulting model is parameterized for the combustion
of Primary Reference Fuel (PRF) blends using 5703 simulations from
a detailed thermo-kinetic model. Semi-empirical correlations in the
model are parameterized using the experimental data obtained from
a single-cylinder engine. The dynamics of fuel transport from intake
port into the cylinder is described using the wall wetting fuel dynamic
model. Step Air Fuel Ratio (AFR) excursions are used to excite the
HCCI engine to determine},
groups = {conferences},
owner = {ckoch},
timestamp = {2009.03.31}
}
@conference{CICS2007a,
author = {M. Shahbakhti and C. R. Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
title = {Thermo-Kinetic Combustion Modeling Of An {HCCI} Engine To Analyze Ignition Timing For Control Applications},
pages = {6},
url = {/~ckoch/open_access/CICS2007a.pdf},
abstract = {Ignition timing in Homogeneous Charge Compression Ignition (HCCI)
engines is dominated by thermo-kinetic reactions that are dependant
on the charge properties. A single zone thermodynamic model, coupled
to a kinetic mechanism, is developed to predict the ignition timing
of Primary Reference Fuels (PRFs) in an HCCI engine. The model, consisting
of 120 chemical reactions and 58 species, is validated against the
experimental data from a single cylinder engine for various operating
conditions. The model is able to predict the effects of different
charge parameters on the HCCI ignition timing. This model is used
to perform a sensitivity analysis of HCCI ignition timing to the
variations of engine charge properties in order to examine the relative
importance of different charge properties for control applications.
The sensitivity analysis is done for these main charge variables:
initial temperature, initial pressure, Exhaust Gas Recirculation
(EGR) rate, equivalence ratio, and octane number. The simulation
results show that the sensitivity of HCCI ignition timing is dependant
on the crank angle position of the Start of Combustion (SOC). The
highest sensitivity of HCCI ignition timing is always seen to the
variation of the charge temperature.},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2007.03.16},
year = {2007}
}
@conference{Shahbakhti_acc2007,
author = {M. Shahbakhti and C. R. Koch},
booktitle = {2007 American Controls Conference (ACC), New York, USA},
title = {Control Oriented Modeling of Combustion Phasing for an {HCCI} Engine},
pages = {3979 to 3984},
url = {/~ckoch/open_access/Shahbakhti_acc2007.pdf},
abstract = {A promising method for enhancing emission and fuel consumption of
internal combustion engines is the Homogeneous Charge, Compression
Ignition (HCCI) engine. Control of ignition timing is the major challenge
before the potential benefits of HCCI combustion can be fully realized
in production applications. The goal of this paper is to develop
a real time model for predicting combustion phasing for HCCI control
applications. The standard Knock-Integral model is developed and
linked with semi-empirical correlations for gas exchange process
and fuel heat release to predict HCCI combustion phasing (CA50, crank
angle where 50\% of the fuel is burnt). The MKIM model is parameterized
using a thermokinetic simulation model. Experimental data from a
single cylinder engine at several HCCI operation conditions and three
fuel blends is used to validate the model.},
groups = {conferences},
month = {July},
owner = {ckoch},
timestamp = {2007.03.16},
year = {2007}
}
@conference{ifac2007,
author = {M. Shahbakhti and R. Lupul and C. R. Koch},
title = {Sensitivity Analysis And Modeling Of {HCCI} Auto-Ignition Timing},
booktitle = {Proceedings of Fifth IFAC Symposium on Advances in Automotive Control, Monterey Coast, California, USA},
year = {2007},
month = {August},
pages = {8},
abstract = {To control auto-ignition timing in a Homogeneous Charge Compression
Ignition (HCCI) engine, it is essential to be able to predict the
auto-ignition timing. Since charge properties influence the auto-ignition
timing, a control-oriented model is further developed to predict
the HCCI auto-ignition timing and the sensitivity to the charge properties
is examined. The simulation results show that in the studied range
the Start of Combustion (SOC) is the most sensitive to the variation
of charge temperature and the least sensitive to the variation of
Exhaust Gas Recirculation (EGR) rate and the sensitivity to charge
temperature increases with decreasing EGR rate.},
groups = {conferences},
owner = {ckoch},
timestamp = {2007.03.16}
}
@conference{jrcice2007_40032,
author = {M. Shahbakhti and R. Lupul and C. R. Koch},
title = {Cyclic Variations of Ignition Timing in an {HCCI} Engine},
booktitle = {Proceedings of JRCICE2007 2007 ASME/IEEE Joint Rail Conference \& Internal Combustion Engine Spring Technical Conf.,Pueblo, Colorado, USA},
year = {2007},
month = {March},
pages = {6},
abstract = {Understanding the effect of modifying the properties of the engine
charge on the cyclic variations of ignition timing is one essential
aspect of being able to predict and control the ignition timing in
Homogeneous Charge Compression Ignition (HCCI) engines. This paper
investigates cyclic variability of HCCI ignition timing using the
experimental data from two different engines at over 300 operating
points for five different blends of iso-octane and n-heptane. Experimental
results indicate that the cyclic variations of HCCI auto-ignition
timing decrease with an increase in the intake manifold temperature
and mixture richness, but it increases with an increase in the EGR
rate.},
groups = {conferences},
owner = {ckoch},
timestamp = {2007.03.16}
}
@conference{Shahbakhti2007,
author = {M. Shahbakhti and R. Lupul and C. R. Koch},
booktitle = {SAE Paper 2007-01-0222},
title = {Predicting {HCCI} Auto-Ignition Timing by Extending a Modified Knock-Integral Method},
url = {/~ckoch/open_access/Shahbakhti2007.pdf},
abstract = {One major challenge in Homogeneous Charge Compression Ignition (HCCI)
combustion is the difficulty in controlling the timing of auto-ignition
which is dependant on mixture conditions. Understanding the effect
of modifying the properties of the engine charge on the start of
combustion is essential to be able to predict and control the auto-ignition
timing. The purpose of this work is to develop a realtime model for
predicting HCCI auto-ignition timing. The standard Livengood and
Wu Knock-Integral Method (KIM) is modified to work with values that
are easier to measure compared with the instantaneous in-cylinder
parameters required in the original KIM. This modified Knock-Integral
Method (MKIM) is developed and is then parameterized using HCCI Thermokinetic
Kinetic Model (TKM) simulations for a single cylinder engine. Estimating
the MKIM parameters is done using an off-line optimization technique.
Once the parameters have been identified, the MKIM needs only the
rate of Exhaust Gas Recirculated (EGR), equivalence ratio, intake
manifold temperature and intake manifold pressure to predict auto-ignition
timing. The MKIM is validated with the experimental data from the
single cylinder engine in HCCI operation by varying equivalence ratio,
EGR level, engine speed, and intake temperature for three different
blends of Primary Reference Fuels (PRF) at octane values of 0, 10
and 20.},
groups = {conferences},
month = {April},
owner = {ckoch},
year = {2007}
}
@conference{Shahidi_asme_2013,
author = {Shahidi, S. and Koch, Charles R. and Bhattacharjee, Subir},
booktitle = {ASME Int Conf. San Diego, November 15-21,2013},
title = {A Milli-Fluidic Device for Electrical Impedance Spectroscopy of Complex Liquids},
doi = {10.1115/IMECE2013-65293},
number = {1},
url = {/~ckoch/open_access/Shahidi_asme_2013.pdf},
abstract = {Rapid characterization of complex liquids such as solutions, mixtures,
dispersions, and emulsions is useful in a variety of industrial applications
ranging from cosmetics, pharmaceuticals, to petroleum production.
An electrical impedance spectroscopy (EIS) based technique for rapidly
determining the characteristics of liquid-liquid mixtures is presented
in this study. A milli-fluidic liquid film impedance measurement
cell is developed employing 3D printing technology. The cell is tested
using glycerol-water mixtures followed by castor oil in water emulsion
samples. Frequency response analysis and equivalent circuit modeling
are performed on each sample to quantify the emulsion properties
in the form of equivalent capacitance and resistance. The developed
technique provides a robust experimental platform for applying EIS
to investigation and rapid estimation of different properties of
oil-water emulsions.},
groups = {conferences},
month = nov,
owner = {ckoch},
timestamp = {2013.11.17},
year = {2013}
}
@conference{Slepicka2016aac,
author = {C. Slepicka and C. R. Koch},
booktitle = {IFAC Advances in Automotive Controls Conference (AAC), Sweden},
title = {Iterative Learning Controller on Dual-fuel Control of Homogeneous Charge Compression Ignition},
number = {11},
pages = {347--352},
publisher = {Elsevier},
url = {/~ckoch/open_access/Slepicka2016aac.pdf},
volume = {49},
abstract = {An Iterative Learning Controller (ILC) is used to control a dual-fuel
Homogeneous Charge Compression (HCCI) engine. The engine is a CFR
engine with a modified head for in-cylinder pressure measurement
ports and was operated at 100$^\circ$C intake heating, 800 RPM and
a compression ratio of 11:1. To control combustion timing and load,
the amount of iso-octane and n-heptane injected into the manifold
are used as inputs. The metrics used for combustion timing and load
are CA50, crank angle when 50\% of the fuel is burned, and gross
IMEP, respectively. Using these inputs and outputs a system identification
was performed using an ARMAX model. This model is then used to generate
a norm optimal control. The norm optimal control is compared to a
model-less control strategy that involve populating the off-diagonal
of the learning matrix using a Jacobian estimate inverse. Both systems
are used to follow a reference trajectory involving a step input
in IMEP then CA50. The model-less control outperforms the norm optimal
in both convergence speed and final iteration error. Application
of non-causal filters within the iteration is also tested using a
zero-phase filter and a Gaussian filter. The zero-phase has faster
convergence than either the Gaussian or filter-less and has better
final iteration error. This gives the best ILC control as model-less
with zero-phase filter. This control is then compared to two PI controllers.
It was found that the ILC outperforms the PI controllers after 3
iterations.},
groups = {conferences},
journal = {IFAC-PapersOnLine},
month = {June},
owner = {ckoch},
timestamp = {2016.01.29},
year = {2016}
}
@conference{Supeene,
author = {G. Supeene and C. R. Koch and S. Bhattacharjee},
title = {Numerically Modeled Dynamic Response of Perfect and Leaky Dielectrical Droplets in an Electric Field},
booktitle = {Proceedings of ICMENS 2005},
year = {2005},
pages = {p99},
groups = {conferences},
owner = {ckoch}
}
@conference{Swan2006,
author = {K. Swan and M. Shahbakhti and C. R. Koch},
booktitle = {SAE Paper 2006-01-1086},
title = {Predicting Start of Combustion Using a Modified Knock Integral Method for an {HCCI} Engine},
pages = {10},
url = {/~ckoch/open_access/Swan2006.pdf},
groups = {conferences},
month = {March},
owner = {ckoch},
year = {2006}
}
@conference{Tsai_cdc2008,
author = {C. M. Tsai and C. R. Koch and M. Saif},
booktitle = {47th IEEE Conference on Decision and Control (CDC), Cancun, Mexico,},
title = {Cycle Adaptive Feedforward Approach Control of an Electromagnetic Valve Actuator},
pages = {5698 - 5703},
url = {/~ckoch/open_access/Tsai_cdc2008.pdf},
abstract = {An electromagnetic valvetrain on an internal combustion engine can
improve the engine thermal efficiency but requires control to achieve
soft landing and to avoid excessive wear and noise. Since the valves
open and close repetitively, cycle adaptive control can be utilized.
A cyclic adaptive feedforward approach controller for automotive
electromagnetic valve is presented. This method uses a Nelder-Mead
direct search algorithm with the goal of setting constant initial
conditions for the landing control. Simulation and testbench results
are presented and they show that the approach control works well
for disturbances that are slow compared to the valve travel time.},
groups = {conferences},
month = {December},
owner = {ckoch},
timestamp = {2009.04.16},
year = {2008}
}
@conference{Tzanetakis2006,
author = {T. Tzanetakis and M. Thomson and C. R. Koch},
title = {Multi-Zone Modeling of a Primary Reference Fuelled {HCCI} Engine,},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting},
year = {2006},
month = {May},
pages = {6},
groups = {conferences},
owner = {ckoch}
}
@conference{Wang-Z_cfd_2017,
author = {Zichuan Wang and Morris R Flynn and Charles Robert Koch},
title = {Model order reduction and boundary control of incompressible Boussinesq flow},
booktitle = {Society of Canada},
year = {2017},
date = {2017-06-19},
pages = {9},
abstract = {The time evolution of a two dimensional incompressible, density stratified, Boussinesq flow in a rectangular cavity is numerically simulated for a range of parameters. Boundary control is then implemented along the upper boundary by adjusting the fluid temperature. More specifically, the top boundary condition of the cavity is a fixed function of space that is modulated by the control input. The resulting numerical simulation for the fluid density and velocity is computed using finite differences in the vertical direction and a spectral method in the horizontal direction. To develop the control strategy, the flow is simulated and a sequence of snapshots of the density and velocity fields are collected. Then, a reduced order modelling method suitable for a linear quadratic regulator (LQR) of the Boussinesq flow is developed using the proper orthogonal decomposition (POD)/Galerkin approach. The reduced order model (ROM) is obtained by projecting the governing equations of the flow onto the sub space spanned by a finite number of basis functions obtained using the method of snapshots. For the flow in question, the POD method based on the snapshots yields six POD modes which capture 99% of the flow energy. The feasibility of this method is assessed using a LQR boundary controller that is designed based on the reduced order model. The cost functional which is minimized in the LQR control design is defined to be the norm of the difference between the actual density field and the desired density field in the cavity. The weighting parameter of the cost functional is found to play a critical role in the process of controller design. The effectiveness of the control is evaluated under both steady and transient flow conditions. In conclusion, a relatively simple feedback control scheme applied on the boundary of a turbulent flow improves the performance in regulating the density field to its desired final state compared to open-loop control.},
groups = {conferences},
owner = {ckoch},
timestamp = {2018-01-23}
}
@conference{Airamezani2017cics,
author = {M. Aliramezani and K. Ebrahimi and C. R. Koch and R. E. Hayes},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Montreal},
title = {Investigating the effect of temperature on {NO}x sensor cross sensitivity to ammonia using a simplified physic-based model},
eventdate = {2017-05-15},
pages = {6},
url = {/~ckoch/open_access/Airamezani2017cics.pdf},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2017-03-28},
year = {2017}
}
@conference{Nazaripoor_icc2017,
author = {H. Nazaripoor and B. Khorshidi and C. R. Koch and M. Sadrzadeh},
title = {Electrohydrodynamic instabilities in heated thin liquid films},
booktitle = {7th International Colloids Conference, Sitges, Spain},
year = {2017},
note = {One page poster},
month = {June},
abstract = {Dynamic and instability in thin liquid films have gained extensive attention as they present in nature and many technological applications like in our eye's cornea, liquid and foam emulsions, coatings and soft lithography. Instabilities in thin liquid films can be generated applying external forces like mechanical, electrical and thermal forces. For the ultrathin films of nanometer thickness range, the role of intermolecular interactions (non-polar and polar) becomes significant. More recently these liquid films have been used in soft lithography, and a broad variety of micro and nano-sized features are generated using the electrically induced perturbation method, so-called electrohydrodynamic (EHD) lithography. In this method, a thin polymer film (with a thickness of h) is spin coated on an electrically conductive substrate and confined with a mounted conductive substrate at a distance of d, then heated to above the film's glass transition temperature (T>Tg). The gap between the film and the top substrate filled with air or any other film layer. Applying electric field induces electrostatic Maxwell stress at the film interface that results in the formation of patterns. Depending on electrical and geometrical properties of this system, pillars, bicontinuous, holes and roll-like structure can form over particular annealing time. In the EHD patterning process, it is assumed that the pattern formation process is performed in an isothermal condition. However, the presence of thermal gradient across the film can generate thermocapillary (TC) forces at the interface in addition to the electrical forces. In this study, the governing equations re-formulated for the EHD instabilities of the heated liquid film using long-wave approximation. Linear stability analysis and non-linear analysis, using numerical simulation, performed to investigate the thermal and electrical properties of film and the bounding layer on the dynamics, instability, and pattern formation process. Results showed the formation of more features with smaller size when the TC forces added to the electrical forces.},
groups = {conferences},
owner = {ckoch},
timestamp = {2017-06-09}
}
@conference{Ebrahimi2018_sae,
author = {K. Ebrahimi and C. R. Koch},
booktitle = {SAE Paper 2018-01-1250},
title = {Symmetric Negative Valve Overlap effects on energy distribution of a single cylinder {HCCI} engine},
pages = {15},
url = {/~ckoch/open_access/Ebrahimi2018_sae.pdf},
abstract = {The effects of Variable Valve Timing (VVT) on Homogeneous Charge Compression Ignition (HCCI) engine energy distribution and waste heat recovery are investigated using a fully flexible Electromagnetic Variable Valve Timing (EVVT) system. The experiment is carried out in a single cylinder, 657 cc, port fuel injection engine fueled with n-heptane. Exergy analysis is performed to understand the relative contribution of different loss mechanisms in HCCI engines and how VVT changes these contributions. It is found that HCCI engine brake thermal efficiency, the
Combined Heat and Power (CHP) power to heat ratio, the first and the second law efficiencies are improved
with proper valve timing. Further analysis is preformed by applying the first and second law of thermodynamics
to compare HCCI energy and exergy distribution to Spark Ignition (SI) combustion using Primary Reference Fuel (PRF). HCCI demonstrates higher fuel efficiency and power to heat and energy loss ratios compared to SI. The results are applicable for the development of micro-CHP systems using an HCCI engine operating at a constant
engine speed with varying loads.},
groups = {conferences},
owner = {ckoch},
timestamp = {2018-04-03},
year = {2018}
}
@conference{Klikach2018cics,
author = {R. Klikach and K. Ebrahimi and C. R. Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Toronto},
title = {Experimental Investigation and Analysis of Natural Gas {RCCI} on a Modifed {GDI} Engine using {NVO}},
eventdate = {2018-05-15},
pages = {6},
url = {/~ckoch/open_access/Klikach2018cics.pdf},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2018-03-28},
year = {2018}
}
@conference{Symko2018cics,
author = {G. Symko and M. Aliramezani and C. R. Koch and R. E. Hayes},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Toronto},
title = {Axial insulation rings - testing and simulation of pressure drop and temperature transients in engine exhaust catalysts},
eventdate = {2018-05-15},
pages = {6},
url = {/~ckoch/open_access/Symko2018cics.pdf},
groups = {conferences},
month = {May},
owner = {ckoch},
timestamp = {2018-03-28},
year = {2018}
}
@conference{Ebrahimi_acc2013,
author = {K. Ebrahimi and C. R. Koch},
booktitle = {2013 American Controls Conference (ACC), Washington, USA},
title = {{HCCI} Combustion Timing Control with Variable Valve Timing},
pages = {3979 to 3984},
url = {/~ckoch/open_access/Ebrahimi_acc2013.pdf},
abstract = {Homogeneous Charge Compression Ignition (HCCI) is a promising concept
for combustion engines to reduce both emissions and fuel consumption.
In HCCI engines, a homogeneous air-fuel mixture auto-ignites due
to compression, which is unlike traditional spark ignition and diesel
engines where ignition is started with either a spark or fuel injection.
HCCI combustion control is a challenging issue because there is no
direct initiator of combustion in HCCI engines. Variable Valve Timing
(VVT) is one effective way to control the combustion timing in HCCI
engines. VVT changes the amount of trapped residual gas and the effective
compression ratio both of which have a strong effect on combustion
timing. In order to control HCCI combustion, a physics based control
oriented model is developed that includes the effect of trapped residual
gas on combustion timing. The control oriented model is obtained
by model order reduction of complex chemical kinetic reaction mechanisms.
This method allows different fuels to be incorporated using a standard
methodology and fills the gap between complex models with highly
detailed chemical kinetics and simple black box models that have
been used in model based control. The control oriented model is used
to develop ignition timing PI control using simulation. The PI control
modulates the trapped residual gas using variable valve timing as
the actuator. The results indicate that the controller can track
step changes in HCCI combustion timing.},
groups = {conferences},
month = {June},
owner = {ckoch},
timestamp = {2018-04-03},
year = {2013}
}
@conference{cics_JM_2023,
author = {J McNally and D Gordon and E Sperling and M Shahbakhti and C R Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Edmonton, AB},
date = {2023-03-13},
title = {Performance and Emission Investigation of Hydrogen Diesel Dual Fuel Combustion},
groups = {conferences},
owner = {ckoch},
timestamp = {2023-03-13},
year = {2023}
}
@conference{cics_MA_2019,
author = {Masoud Aliramezani and Armin Norouzi and Charles Robert Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Kelowna, BC},
date = {2019-03-13},
title = {A control oriented diesel engine {NOx} emission model for on board diagnostics and engine control with sensor feedback},
url = {/~ckoch/open_access/cics_MA_2019.pdf},
groups = {conferences},
owner = {ckoch},
timestamp = {2019-03-13},
year = {2019}
}
@conference{AAC_AN_2019,
author = {Armin Norouzi and Khashayar Ebrahimi and Charles Robert Koch},
title = {Integral Discrete-time Sliding Mode Control of Homogeneous Charge Compression Ignition ({HCCI}) Engine Load and Combustion Timing},
booktitle = {9th IFAC Int. Sym. on Advances in Automotive Control, Orleons, France},
year = {2019},
date = {2019-03-13},
groups = {conferences},
owner = {ckoch},
timestamp = {2019-03-13}
}
@conference{CCECE_AN_2019,
author = {A. Norouzi and C. R. Koch},
booktitle = {Canadian Conference of Electrical and Computer Engineering},
title = {Robotic Manipulator Control Using {PD}-type Fuzzy Iterative Learning Control},
url = {/~ckoch/open_access/CCECE_AN_2019.pdf},
groups = {conferences},
owner = {ckoch},
timestamp = {2019-03-13},
year = {2019}
}
@conference{SCC_DG_2019,
author = {David Gordon and Christian Wouters and Shota Kinoshita and Maximilian Wick and Bastian Lehrheuer and Jakob Andert and Stefan Pischinger and Charles R Koch},
booktitle = {Symposium of Combustion Control, Aachen Germany},
date = {2019-06-26},
title = {{HCCI} Combustion Stability Improvement Using a Rapid Ignition System},
url = {/~ckoch/open_access/SCC_DG_2019.pdf},
groups = {conferences},
owner = {ckoch},
timestamp = {2020-05-22},
year = {2019}
}
@conference{cics_AN_2019,
author = {Armin Norouzi and Masoud Aliramezani and Charles Robert Koch},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Kelowna, BC},
date = {2019-03-13},
title = {Diesel Engine {NOx} Reduction Using a {PD}-type Fuzzy Iterative Learning Control with a Fast Response {NOx} Sensor},
url = {/~ckoch/open_access/cics_AN_2019.pdf},
owner = {ckoch},
timestamp = {2019-03-13},
year = {2019}
}
@conference{CCTA_2020,
author = {Armin Norouzi and David Carl Gordon and Masoud Aliramezani and Charles Robert Koch},
booktitle = {2020 IEEE Conference on Control Technology and Applications (CCTA)},
title = {Machine Learning-based Diesel Engine-Out NOx Reduction Using a plug-in PD-type Iterative Learning Control},
organization = {IEEE},
pages = {450--455},
url = {/~ckoch/open_access/CCTA_2020.pdf},
groups = {conferences},
owner = {ckoch},
timestamp = {2020-12-26},
year = {2020}
}
@conference{sae2021_MA,
author = {Masoud Aliramezani and Charles Robert Koch},
date = {2021-01-04},
title = {Response characteristics of an amperometric NOx-O2 sensor at non diffusion-rate-determining conditions},
note = {SAE 2021-01-0678},
url = {/~ckoch/open_access/sae2021_MA.pdf},
groups = {conferences},
journal = {SAE 2021-01-0678},
owner = {ckoch},
timestamp = {2021-03-03},
year = {2021}
}
@conference{Norouzi2020,
author = {Armin Norouzi and Charles Robert Koch},
title = {Integration of {PD}-type Iterative Learning Control with Adaptive Sliding Mode Control},
doi = {10.1016/j.ifacol.2020.12.1717},
number = {2},
pages = {6213--6218},
publisher = {{IFAC}-{PapersOnLine}, Elsevier {BV}},
volume = {53},
groups = {conferences},
journal = {{IFAC}-{PapersOnLine}},
year = {2020}
}
@conference{Aliramezani2020,
author = {Masoud Aliramezani and Armin Norouzi and Charles Robert Koch},
date = {2020-07-15},
title = {Support vector machine for a diesel engine performance and {NOx} emission control-oriented model},
doi = {10.1016/j.ifacol.2020.12.916},
number = {2},
pages = {13976--13981},
publisher = {{IFAC}-{PapersOnLine}, Elsevier {BV}},
url = {/~ckoch/open_access/Aliramezani2020.pdf},
volume = {53},
groups = {conferences},
journal = {{IFAC}-{PapersOnLine}},
year = {2020}
}
@conference{Xie2020,
author = {Junyao Xie and Charles Robert Koch and Stevan Dubljevic},
date = {2020-07-15},
title = {Internal Model Controller Design of Linearized Ginzburg-Landau Equation},
doi = {10.1016/j.ifacol.2020.12.1523},
number = {2},
pages = {7728--7733},
publisher = {{IFAC}-{PapersOnLine}, Elsevier {BV}},
volume = {53},
groups = {conferences},
journal = {{IFAC}-{PapersOnLine}},
year = {2020}
}
@conference{ICEF2010-35087,
author = {Ahmad Ghazimirsaied and Mahdi Shahbakhti and Charles Robert Koch},
booktitle = {Proceedings of the ASME Internal Combustion Engine Division 2010 Fall Conference},
date = {2010-10-15},
title = {COMPARISON OF CRANKANGLE BASED IGNITION TIMING METHODS ON AN HCCI ENGINE},
eventdate = {September 12-15, 2010},
location = {San Antonio, Texas, USA},
url = {/~ckoch/open_access/ICEF2010-35087.pdf},
groups = {conferences},
year = {2010}
}
@conference{Shahpouri2021,
author = {Shahpouri, Saeid and Norouzi, Armin and Hayduk, Christopher and Rezaei, Reza and Shahbakhti, Mahdi and Koch, Charles Robert},
booktitle = {Modeling, {Estimation} and {Control} {Conference} {MECC} 2021},
date = {2021-01},
title = {Soot {Emission} {Modeling} of a {Compression} {Ignition} {Engine} {Using} {Machine} {Learning}},
doi = {10.1016/j.ifacol.2021.11.274},
language = {en},
number = {20},
pages = {826--833},
url = {https://www.sciencedirect.com/science/article/pii/S2405896321023181},
urldate = {2022-02-25},
volume = {54},
abstract = {Control of real driving soot emissions in diesel vehicles requires accurate predictive models for engine-out soot emissions. This paper presents an innovative modeling approach that combines a physics-based model and a black-box model to predict soot from a 4.5-liter compression ignition engine under varying load and speed conditions. The physical model is based on an experimentally validated 1D engine model in GT-power. In contrast, the black-box model is designed by investigating different machine learning approaches, including a Bayesian neural network (BNN), support vector machine (SVM), regression tree, and an ensemble of regression tree. The experimental data from running the engine at 219 load and speed conditions are collected and used for training and testing the soot model. The least absolute shrinkage and selection operator (LASSO) feature selection method is used on the GT model outputs to find the most critical parameters in soot prediction. The grey-box modeling results are compared with those from the black-box as well as the physical model. The results show that the grey-box SVM and black-box single hidden layer BNN method provide the best performance with a coefficient of determination (R2) of 0.95. For most cases, grey-box models outperform the black-box models with the same Machine Learning (ML) algorithm by comparing R2 of the test data, but this difference becomes negligible when a single hidden layer neural network is used.},
file = {:Shahpouri2021 - Soot Emission Modeling of a Compression Ignition Engine Using Machine Learning (1).html:URL},
groups = {conferences},
issn = {2405-8963},
journal = {IFAC-PapersOnLine},
keywords = {Diesel engines, Soot emissions, Machine learning, grey-box modeling, Physical model, data-driven modeling},
year = {2021}
}
@conference{IFAC2023_AW,
author = {Alexander Winkler and Weizhou Wang and Armin Norouzi and David Gordon and Charles Robert Koch and Jakob Andert},
date = {2022-11-10},
title = {Integrating Recurrent Neural Networks into Model Predictive Control for Thermal Torque Derating of Electric Machines},
doi = {https://doi.org/10.1016/j.ifacol.2023.10.1010},
note = {22nd IFAC World Congress},
number = {2},
pages = {8254-8259},
url = {https://www.sciencedirect.com/science/article/pii/S2405896323013939},
volume = {56},
groups = {conferences},
issn = {2405-8963},
journal = {IFAC-PapersOnLine},
year = {2023}
}
@conference{Norouzi2022,
author = {Armin Norouzi and Saeid Shahpouri and David Gordon and Alexander Winkler and Eugen Nuss and Dirk Abel and Jakob Andert and Mahdi Shahbakhti and Charles Robert Koch},
title = {Machine Learning Integrated with Model Predictive Control for Imitative Optimal Control of Compression Ignition Engines},
doi = {10.1016/j.ifacol.2022.10.256},
number = {24},
pages = {19--26},
publisher = {Elsevier {BV}},
volume = {55},
groups = {conferences},
journal = {{IFAC}-{PapersOnLine}},
year = {2022}
}
@conference{cics_DG_2019,
author = {D. Gordon and C.R. Koch and C. Wouters and B. Lehrheuer and S. Pischinger and M. Wick and J. Andert},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Kelowna, BC},
date = {2019-03-13},
title = {{NVO} peak pressure based in-cycle control for {HCCI} combustion using direct water injection},
url = {/~ckoch/open_access/cics_DG_2019.pdf},
groups = {conferences},
owner = {ckoch},
timestamp = {2019-03-13},
year = {2019}
}
@conference{cics_SS_2022,
author = {S. Shahpouri and A. Norouzi and C. Hayduk and R. Rezaei and C.R. Koch and M. Shahbakhti},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Ottawa, ON},
date = {2021-03-13},
title = {Modeling of a Single-Fuel Hydrogen Spark ignition and a Dual-FuelDiesel-Hydrogen Engines},
groups = {conferences},
owner = {ckoch},
timestamp = {2022-03-13},
year = {2022}
}
@conference{cics_DG_2023,
author = {D Gordon and E Sperling and A Norouzi and C R Koch and A Winkler and J Andert},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Edmonton, AB},
title = {Deep Neural Network based Performance and Emission Modelling},
year = {2023},
date = {2023-03-13},
groups = {conferences},
owner = {ckoch},
timestamp = {2023-03-13},
url = {/~ckoch/open_access/cics_DG_2019.pdf}
}
@conference{cics_DGI_2023,
author = {D Gordon and E Sperling and A Norouzi and C R Koch and A Winkler and J Andert},
booktitle = {Combustion Institute/Canadian Section (CI/CS) Spring Technical Meeting , Edmonton, AB},
title = {MPC implementation for HCCI Combustion using a Deep Neural Network based model},
year = {2023},
date = {2023-03-13},
groups = {conferences},
owner = {ckoch},
timestamp = {2023-03-13}
}
@conference{Cassol2023,
author = {Guilherme Ozorio Cassol and Charles Robert Koch and Stevan Dubljevic},
booktitle = {2023 American Control Conference ({ACC})},
date = {2023-05},
title = {Predictive Controller Design for a {PDE}-{ODE} system with mixed discrete-continuous constrained actuation},
doi = {https://doi.org/10.23919/acc55779.2023.10156649},
publisher = {{IEEE}},
groups = {conferences},
year = {2023}
}
@conference{ErfanCMAS2023,
author = {E Hajiparvaneh and H. Alizadeh and C R Koch and V Hosseini},
booktitle = {Community Modeling and Analysis System {CMAS} Conference},
date = {2023-10-16},
title = {Sensitivity analysis of ambient NO2 concentration to primary emission sources in Alberta},
location = {Chapel Hill, NC},
groups = {conferences},
year = {2023}
}
@conference{ccme_SM_2023,
author = {S Moghadasi and A Salahi and H Borhan and C R Koch and M Shahbakhti},
booktitle = {Canadian Society of Mechanical Engineers (CSME) 2023 International Congress, Sherbrooke, QC},
date = {2024-01-25},
title = {Performance and Emission Investigation of Hydrogen Diesel Dual Fuel Combustion},
groups = {conferences},
owner = {ckoch},
timestamp = {2023-03-13},
year = {2023}
}
@conference{ccme_AS_2023,
author = {A Salahi and S Moghadasi and H Borhan and C R Koch and M Shahbakhti},
booktitle = {Canadian Society of Mechanical Engineers (CSME) 2023 International Congress, Sherbrooke, QC},
date = {2024-01-25},
title = {Imitative Learning Control of a LSTM-NMPC Controller on PEM Fuel Cell for Computational Cost Reduction},
groups = {conferences},
owner = {ckoch},
timestamp = {2023-03-13},
year = {2023}
}
@conference{ccme_AY_2023,
author = {A Yasami and A Vafamand and A Jordan and H Borhan and C R Koch and M Shahbakhti},
booktitle = {Canadian Society of Mechanical Engineers (CSME) 2023 International Congress, Sherbrooke, QC},
date = {2024-01-25},
title = {Control of a Modified Double Inverted Pendulum Using Machine Learning Based Model Predictive Control},
groups = {conferences},
owner = {ckoch},
timestamp = {2023-03-13},
year = {2023}
}
@conference{ccme_AH_2022,
author = {H. Abediasl and V Hosseini and C R Koch and M Shahbakhti},
booktitle = {Canadian Society of Mechanical Engineers (CSME) 2022 International Congress, Edmonton, AB},
date = {2023-01-25},
title = {Emission Measurement of University Fleet Vehicles through On-road Remote Sensing and Identification of High NOx Emitters},
groups = {conferences},
owner = {ckoch},
timestamp = {2022-06-05},
year = {2022}
}
@conference{ccme_AA_2022,
author = {A Ansari and H Abediasl and P Rakeshkumar Patel and V Hosseini and C R Koch and M Shahbakhti},
booktitle = {Canadian Society of Mechanical Engineers (CSME) 2022 International Congress, Edmonton, AB},
date = {2023-01-25},
title = {Estimating Instantaneous Fuel Consumption of Vehicles by using Machine Learning and Real-time On-board Diagnostics (OBD) Data},
groups = {conferences},
owner = {ckoch},
timestamp = {2022-06-05},
year = {2022}
}
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