This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Nonlinear, Closed Loop, SI Engine Control Observers
Annotation ability available
Sector:
Language:
English
Abstract
Conventional electronic engine control systems suffer from poor transient air/fuel ratio control accuracy. This is true of speed-throttle, speed-density, and mass air flow (MAF) control systems with either single point (or central) or port fuel injection. The reason for this is that they fail to
-
1.
compensate for the nonlinear dynamics of the fuel film in the intake manifold or in the vicinity of the intake valves.
-
2.
estimate correctly the air mass flow at the location of the injector(s).
This paper presents a nonlinear fuel film compensation network and a nonlinear closed loop observer. The nonlinear fuel film compensator gives improved global cancellation of the fuel film dynamics, while the closed loop observer has improved robustness with respect to modelling error and measurement noise. The closed loop observer is based on a modified constant gain extended Kalman filter. Besides improved robustness, an extra bonus of using the new observer configuration is that it is capable of doing condition monitoring while at the same time carrying out its basic air/fuel ratio control task. The new controller has been tested on a multicylinder engine with excellent results over the entire operating range of the engine.
Recommended Content
Authors
Citation
Hendricks, E., Vesterholm, T., and Sorenson, S., "Nonlinear, Closed Loop, SI Engine Control Observers," SAE Technical Paper 920237, 1992, https://doi.org/10.4271/920237.Also In
References
- Hendricks, E. Sorenson, S. C. “SI Engine Controls and Mean Value Engine Modelling” SAE Technical Paper No. 910258 1991
- Hendricks, E. Sorenson, S. C. “Mean Value Engine Modelling of Spark Ignition Engines” SAE Technical Paper No. 900616 1990
- Cassidy, J. F. Athens, M. Lee, W. H. “On the Design of Electronic Automotive Engine Controls Using Linear Quadratic Control Theory” IEEE Trans. on Automatic Control AC-25 5 1980
- Morris, R. L. Powell, B. K. “Modern Control Applications in Idle Speed Control Paper No. WA4-11:45 1983 American Control Conference (ACC) 1983
- Hendricks, E. Poulsen, N. “Minimum Energy Control of Large Diesel Engines” SAE Technical Paper No. 861191 1986
- Hendricks, E. “Transient Errors in Classical SI Engine Controllers” 1991 American Control Conference (1991 ACC) Paper No. TP-14 1991
- Aquino, C. F. “Transient A/F Control Characteristics of the 5 Liter Central Fuel Injection System” SAE Technical Paper No. 810494 in SP-487 1981
- Harrington, D. L. Bolt, J. A. Analysis and Digital Simulation of Carburetor Metering” SAE Technical Paper No. 700082 1970
- Nishiyama, R. Ohkubo, S. Washino, S. “An Analysis of Controlled Factors Improving Transient A/F Control Characteristics” SAE Technical Paper No. 890761 in SP-788 1989
- Benninger, N. F. Plapp, G. “Requirements and Performance of Engine Management Systems under Transient Conditions” SAE Technical Paper No. 910083 1991
- Hendricks, E. Vesterholm, T. “The Analysis of Mean Value SI Engine Models” SAE Technical Paper 1992
- Lillelund, J. Hendricks, E. “A PC Engine Control Development System” SAE Technical Paper No. 910259 1991
- Hendricks, E. Sorenson, S. C. “Mean Value Modelling of Spark Ignition Engines” SAE Technical Paper No. 900616 1991
- Kwakernaak, H. Sivan, R. Linear Optimal Control Systems Wiley Interscience, Inc. NY, NY 1972
- Gelb, A. Applied Optimal Estimation The M. I. T. Press Cambridge MA 1989
- Vesterholm, T. Hendricks, E. “Higher Order Continuous SI Engine Observers” American Control Conference 1992
- Safonov, M. Athens, M. “Robustness and Computational Aspects of Nonlinear Stochastic Estimators and Regulators” IEEE Transactions on Automatic Control AC-23 4 1978