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Determination of a Nonlinear, Unified and Robust Individual Cylinder Air Fuel Ratio Estimator
Technical Paper
2000-01-0262
ISSN: 0148-7191, e-ISSN: 2688-3627
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Event:
SAE 2000 World Congress
Language:
English
Abstract
The optimization of fuel efficiency and the minimization of the residual gas fraction require individual cylinder control of the amounts of inducted air mass and injected fuel mass. Determination of an individual cylinder air/fuel ratio (AFR) regulator is based on the measured AFR for each cylinder, using 4 proportional UEGO sensors. The innovative character of this study describes a unified and robust individual cylinder AFR estimator, using a single measuring point: a proportional oxygen sensor located in the exhaust manifold.
The model used for the estimator is a state model such that the dimension of the state and measurement matrices are unique, whatever the manifold configuration and the sensor position (confluence point or exhaust manifold: unified model), the engine speed (robust model). The study and validation of the estimator was done on an exhaust gas simulator from the exhaust valves to the catalytic converter
The nonlinear and nonstationary behaviour of the exhaust gas propagation process, and thus of the AFR estimator has been brought into evidence. Three estimators with criteria for « breakup of models » have been developped (kalman estimator, estimator with stochastic nonstationary noise state variable, state reconstructor).
The estimator's quality improves with its complexity, the state reconstructor requires setting up a state matrix map of the exhaust manifold.
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Authors
Citation
Fantini, J., Chamaillard, Y., Gouy, F., and Peron, L., "Determination of a Nonlinear, Unified and Robust Individual Cylinder Air Fuel Ratio Estimator," SAE Technical Paper 2000-01-0262, 2000, https://doi.org/10.4271/2000-01-0262.Also In
References
- HASEGAWA Y. and al. « Individual Cylinder Air Fuel Ratio Feedback Control Using an Observer » SAE Paper 940376
- CARNEVALE C. HADJI M. « Cylinder to Cylinder AFR Control with an Asymetrical Exhaust Manifold in a GDI System » SAE Paper 981064
- GRIZZLE J. DOBBINS K. COOK J. «Individual Cylinder Air-Fuel Ratio Control with a Single EGO Sensor» 1991 IEEE Transactions on Vehiclular Technology 40 1
- AMSTUTZ A. FEKETE N. POWELL D. «Model Based Air-Fuel Ratio Control in SI Engine with a Switch-Type EGO Sensor» SAE 940972
- KAINZ J. L. SMITH J. C. «Individual Cylinder Fuel Control with a Switching Oxygen Sensor » SAE 99-01-0546