09 shaver ecosm12
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Robust Oxygen Fraction Estimation for
Diesel Engines Utilizing Variable Intake
Valve Actuation
Presented By:
Greg ShaverAuthors:
Lyle Kocher Karla Stricker
D. G. Van Alstine Greg Shaver
Herrick Labs
School of Mechanical Engineering
Purdue University
IFAC E-COSM12
Rueil-Malmaison, France
October 24, 2012
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Motivation for In-Cylinder Oxygen
Fraction Estimation
Oxygen Fraction Estimator
Development
Analysis Stability, Convergence,
and Robustness
Experimental Results
Conclusions
Presentation Overview
EGR VALVE
Exhaust
Intake Manifold
Exhaust Manifold
CAC
EGR Cooler
FRESH AIR
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Gas Exchange
Process
Combustion Process
Conventional
combustion
Advanced combustion
strategies (i.e. PCCI,
RCCI)
EGR valve
position
VGT
position
Intake Valve
modulation
Engine
speed
Exhaust gas
enthalpy
mIVC
Fcyl
ECR
TIVC
mixing
Fuel
Injection
Torque
Emissions
Fuel
consumption
Exhaust gas
enthalpy
Motivation for Oxygen Fraction Estimation
Gas Exchange Handshaking
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Motivation for In-Cylinder Oxygen
Fraction Estimation
Oxygen Fraction Estimator
Development
Analysis Stability, Convergence,
and Robustness
Experimental Results
Conclusions
Presentation Overview
EGR VALVE
Exhaust
Intake Manifold
Exhaust Manifold
CAC
EGR Cooler
FRESH AIR
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Oxygen Fraction Dynamics
In-Cylinder O2
Can not directly measure but can estimate
me - trapped fresh charge mass
mres - trapped residual mass
Fem - proxy can be measured post-turbine
Fim - production viable sensor not available
e res emcyl
e res
im
m m F
m
FF m
120 ee
W
m N
em evc
resem
P V
m RT
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Oxygen Fraction Dynamics
imim amb c em egr im e
im im
RTF F W F W F W
P V
emem eo e f em egr em t em em
RTF F W W F W F W
P V
vol im d e
im
P VW
RT
- physically-based model
(incorporates impact of flexible
intake valve actuation)
Wegr - EGR Flow estimator
Wf - ECM commandWc - mass airflow sensor
Wt - analytical functions based
upon map data & man.
pressures and turbo speed
vol
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Motivation for In-Cylinder Oxygen
Fraction Estimation
Oxygen Fraction Estimator
Development
Analysis Stability, Convergence,
and Robustness
Experimental Results
Conclusions
Presentation Overview
EGR VALVE
Exhaust
Intake Manifold
Exhaust Manifold
CAC
EGR Cooler
FRESH AIR
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Oxygen Fraction Estimator Analysis
im egr
im e em egr t
k WL
k W k W W l
2 2
2
1 1
2 2
2 2
im em
im e em em em em im e
V g g
V k W V k g g lg k W V
Choose:
Lyapunov
eqn.
candidate:
201
2
im ek W
im e
V t V t e
k W
2 2
em em em em em em em em em
em emem
em
lg k g g k g g k g
k gl k
g
em emg g g g A g k g L Cg EstimatorError:
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em em em
em
k gl kg
32 2132 1312 , 1350
0.5l l
em
k
For practical purposes,
Utilize knowledge of the physical system
to find bounds for physical parameters
Where reflectsup to a 10% error
in turbine flow
estimate
Parameters for calibration: Turbine mass estimate error:
Acceptable exhaust O2
estimation error:
0.5%em em em em emg g g F F is acceptable
emg
Oxygen Fraction Estimator Analysis
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Motivation for In-Cylinder Oxygen
Fraction Estimation
Oxygen Fraction Estimator
Development
Analysis Stability, Convergence,
and Robustness
Experimental Results
Conclusions
Presentation Overview
EGR VALVE
Exhaust
Intake Manifold
Exhaust Manifold
CAC
EGR Cooler
FRESH AIR
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Oxygen Fraction Estimator Results2300 rpm & 522 N-m
Increase inEGR fraction
from ~ 12%
to 24%
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Oxygen Fraction Estimator Convergence2300 rpm & 522 N-m
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Motivation for In-Cylinder Oxygen
Fraction Estimation
Oxygen Fraction Estimator
Development
Analysis Stability, Convergence,
and Robustness
Experimental Results
Conclusions
Presentation Overview
EGR VALVE
Exhaust
Intake Manifold
Exhaust Manifold
CAC
EGR Cooler
FRESH AIR
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In-Cylinder O2fraction is critical to control of combustion processes
Model-based observer designed for in-cylinder O2fraction estimation
AnalysisExponential stability results demonstrated, but rate dependent on operating point
Robustness to turbine flow estimation/measurement uncertainty demonstrated
Lower gain bound derived from expected turbine flow error & acceptable Femerror
Experimental results shown for in-cylinder oxygen fraction estimator
Future workexplore possible extension to: Robustness to other uncertainties (e.g., EGR flow, fuel flow, etc.) Tunable error convergence rates
Is there an upper gain bound? Very likely. What is it, and why?
Conclusions
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EGR Flow calculation from ECMnot reliable at higher EGR Flows
Developed high gain estimator
strategy based upon the intakemanifold filling dynamics
im im im imim comp cac eng im egr egr im im
R Rp W T W T W T
V V
im im
egr
im im egr
V pW
R T
2im im comp cac eng im imim
RW T W T p
V
EGR Flow Estimator
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