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The Analysis of Mean Value SI Engine Models
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1992 by SAE International in United States
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Mean value engine models (MVEMs) seek to predict dynamically the mean values of important SI engine variables such as the crank shaft speed, the manifold pressure and the theoretical air/fuel ratio (lambda). Previous work also shows that such models can be made quite accurate, both for stationary and transient operating modes. Because these models can be made mathematically simple and compact, they are also tractable for direct mathematical and physical analysis.
In this paper an analysis of a mean value engine model is carried out which reveals the underlying structure of the problems which face engine control system designers. In particular it is shown that an SI engine is extremely nonlinear and time dependent. Because of this, conventional control strategies using conventional sensors cannot be made to operate correctly in the transient regime. An “ideal” nonlinear compensator is also described for the fueling dynamics which works over a wide operating range.
|Technical Paper||SI Engine Controls and Mean Value Engine Modelling|
|Technical Paper||Predicting the Port Air Mass Flow of SI Engines in Air/Fuel Ratio Control Applications|
|Technical Paper||Engine Dynamics: Time-Based Versus Crank-Angle Based|
CitationHendricks, E. and Vesterholm, T., "The Analysis of Mean Value SI Engine Models," SAE Technical Paper 920682, 1992, https://doi.org/10.4271/920682.
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