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A Nonlinear Wall-Wetting Model for the Complete Operating Region of a Sequential Fuel Injected SI Engine
Technical Paper
2000-01-1260
ISSN: 0148-7191, e-ISSN: 2688-3627
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Event:
SAE 2000 World Congress
Language:
English
Abstract
The wall-wetting dynamics represent a very important subsystem of the air/fuel path of an SI engine. The precise feedforward control of the air/fuel ratio requires a valid model of the wall-wetting dynamics over the whole operating region of the engine.
A global wall-wetting model has been developed for a production SPFI gasoline engine. This model is capable of describing the wall-wetting dynamics not only in a fixed operating point, but also for radical changes of the operating point. Its structure specifically allows for model-based compensator design and on-line parameter identification.
Earlier, related publications discussed linear model structures. Those models described the dynamics around a fixed operating point only. This paper shows how one global model for the whole operating range can be constructed from a linear model and its parameter range. New functions describe the changes of the total amount of fuel in the intake manifold during transient stages of the engine operation. Measurements conducted on a dynamic engine test bench show good results for this approach.
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Authors
- Michael R. Simons - Measurement and Control Laboratory, Swiss Federal Institute of Technology (ETH)
- Marzio Locatelli - Measurement and Control Laboratory, Swiss Federal Institute of Technology (ETH)
- Christopher H. Onder - Measurement and Control Laboratory, Swiss Federal Institute of Technology (ETH)
- Hans P. Geering - Measurement and Control Laboratory, Swiss Federal Institute of Technology (ETH)
Citation
Simons, M., Locatelli, M., Onder, C., and Geering, H., "A Nonlinear Wall-Wetting Model for the Complete Operating Region of a Sequential Fuel Injected SI Engine," SAE Technical Paper 2000-01-1260, 2000, https://doi.org/10.4271/2000-01-1260.Also In
References
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- Heywood John B. Internal Combustion Engine Fundamentals Mc Graw Hill Singapore 1995
- Kendlbacher Christoph VDI Verlag Düsseldorf 1994
- Locatelli Marzio Nonlinear Modeling of the Wall-Wetting Dynamics of an SI-Engine Measurement and Control Laboratory ETH Zurich 1999
- Onder Christopher H. Geering Hans P. Model Identification for the A/F Path of an SI Engine SAE Paper 970612 Detroit, MI 1997
- Onder Christopher H. Roduner Christian A. Simons Michael R. Geering Hans P. Wall-Wetting Parameters over the Operating Region of a Sequential Fuel-Injected SI Engine SAE Paper 980792 Detroit, MI 1998
- Simons Michael R. Shafai Esfandiar Geering Hans P. On-Line Identification Scheme for Various Wall-Wetting Models SAE Paper 980793 Detroit, MI 1998