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Advanced Nonlinear Observer Control of SI Engines
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English
Abstract
In earlier work it has been shown that a nearly ideal solution to the problem of accurate estimation of the air mass flow to a central fuel injection (CFI) (or throttle body (TBI)) or EFI (or multi-point (MPI)) equipped engine is provided by using a closed loop nonlinear observer for the engine. With proper design this observer was shown to be both accurate and robust with respect to modelling end measurement errors. It is based on a Constant Gain Extended Kalman Filter (CGEKF).
Since the publication of this work, another type of observer has emerged in the literature for which claims of great robustness have been made. This observer is based on new developments in the area of nonlinear control theory and is called a Sliding Mode Observer (SMO).
In this paper these two types of observers are compared theoretically and experimentally on an engine mounted on a dynamometer. A very aggressive driving scenario is assumed for these tests. It is shown that while the sliding mode observer does have certain robustness characteristics, these are not of a higher order than those of a CGEKF based observer. Moreover the mode of operation of the SMO is inherently noisy which degrades its performance when compared to the CGEKF. Both observers can be realized in currently available engine control microprocessors.
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Authors
Citation
Kaidantzis, P., Rasmussen, P., Jensen, M., Vesterholm, T. et al., "Advanced Nonlinear Observer Control of SI Engines," SAE Technical Paper 930768, 1993, https://doi.org/10.4271/930768.Also In
References
- Hendricks E. Vesterholm T. Sorensen S. C. “The Analysis of Mean Value SI Engine Models” Society of Automotive Engineers (SAE) Technical Paper No. 920682 1992
- Vesterholm T. Hendricks E. “Higher Order Continuous SI Engine Observers” 1992 American Control Conference (ACC), Paper No. WM1, 14:20-14:40 June 1992
- Safanov M. G. Athans M. “Robustness and Computational Aspects of Nonlinear Stochastic Estimators and Regulators” IEEE Transactions on Automatic Control. AC-23 4 1978
- Slotine J.-J. E. Hedrick J. K. Misawa E. A. “On Sliding Observers for Nonlinear Systems” Transactions of the American Society of Mechanical Engineers (ASME)-Journal of Dynamic Systems, Measurement and Control 109 245 252 September 1987
- Misawa E. A. Nonlinear State Estimation Using Sliding Observers Ph.D. thesis Massachusetts Institute of Technology February 1988
- Hendricks E. Sorensen S. C. “Mean Value Modelling of Spark Ignition Engines” SAE Technical Paper 900616 1990
- Kaidantzis P. Rasmussen P. Observer Control of Spark Ignition Engines Masters Thesis Technical University of Denmark, Institute of Automatic Control Systems August 1992
- Filippov A. F. “Differential Equations with Discontinuous Right Hand Sides” American Mathematical Society Translations, Series 2 42 1964