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Model-Based Multivariable Speed and Air-to-Fuel Ratio Control of an Sl Engine
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Abstract
In conventional engine control typically several heuristic controllers influence each other. To avoid the inherent conflicts, the following concept is investigated:
A single model-based multivariable controller is used to control speed and air-to-fuel ratio simultaneously. The dynamic compensator is always in the loop. Thus, the stability of the system is not compromised by a change of structure.
The commanded throttle position is now an output of the compensator. Therefore, an interpretation of the position of the accelerator is used to obtain the speed setpoint of the multivariable controller (“fly-by-wire”). The position of the driver pedal is interpreted as a desired acceleration of the vehicle.
To increase the bandwidth of the control system, a feed-forward is introduced. The feed-forward for the throttle setpoint is a function of the speed setpoint. Feed-forward does not change any stability characteristics.
Implementing this concept on a dynamic test bench shows the possibility for following the highest acceleration which occurs in the FTP cycle within the given tolerances.
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Citation
Onder, C. and Geering, H., "Model-Based Multivariable Speed and Air-to-Fuel Ratio Control of an Sl Engine," SAE Technical Paper 930859, 1993, https://doi.org/10.4271/930859.Also In
References
- Murthy T.K.S. Brebbia C.A. Computers in Design Construction and Operation of Automobiles Berlin Springer 1987
- Aquino C.F. Transient A/F Control Characteristics of the 5 Liter Central Fuel Injection Engine SAE Paper 810494 1981
- Wiedenmann H.M. Raff L. Noack R. Heated Zirconia Oxygen Sensor for Stoichiometric and Lean Air-Fuel Ratios SAE Paper 840141 1984
- Powell J.D. A Review of IC Engine Models for Control System Design, IFAC 10th World Congress on Automatic Control Munich, Germany 1987 3 233 238
- Spitzmüller T. Stadler T. Digitale Steuerung und Regelung von parallelen, dynamischen Systemen im Zeit-Multiplexerbetrieb Measurement and Control Lab., Swiss Federal Institute of Technology (ETH) Zurich 1991 92
- Eckardt D. 1990
- Onder Ch. Bestimmung eines einfachen dynami-schen Modells des Motors Measurement and Control Lab., Swiss Federal Institute of Technology (ETH) Zurich 1987
- Onder Ch. Messungen der Wandfilmdynamik an einern BMW M30 Motor Measurement and Control Lab., Swiss Federal Institute of Technology (ETH) Zurich 1991
- Onder Ch. Mathernatische Modelle fUr die Dynamik von Lambdasonden Measurement and Control Lab., Swiss Federal Institute of Technology (ETH) Zurich 1992
- Geering H.P. ICX, a custom VLSI-chip for engine control Proceedings of the 5th IAVD Congress Geneva 1989
- Geering H.P. 1986
- Baumgartner Ch.E. Geering H.P. Onder Ch.H. Shafai E. Robust Multivariable Idle Speed Control Proceedings of the 1986 American Control Conference Seattle, WA 1986 258 265
- Baumgartner Ch.E. Onder Ch.H. Geering H.P. Multivariable Control of Lean-Bum Engines, IFAC 10th World Congress of Autonomic Control Munich 1987 3 245 249
- Kiencke U. Cao C.T. 1988
- Hundertmark D.
- Demel H. Diem E. Lenz H.P. Quantitative Determination of the Fuel Film in Inlet Manifolds of SI Engines MTZ Motortechnische Zeitschrift 44 1983 7 8
- Benninger N.F. Glöckler O. 1990
- Braun H.S. Krämer G. T'heissen M.