Abstract
In this chapter, mean-value models (MVM) of the most important subsystems of SI and Diesel engines are introduced. In this book, the notion of MVM will be used for a specific set of models as defined below. First, a precise definition of the term MVM is given. This family of models is then compared to other models used in engine design and optimization. The main engine sub models are then discussed, namely the air system that determines how much air is inducted into the cylinder; the fuel system that determines how much fuel is inducted into the cylinder; the torque generation system that determines how much torque is produced by the air and fuel in the cylinder as determined by the first two parts; the engine inertial system that determines the engine speed; the engine thermal system that determines the dynamic thermal behavior of the engine; the pollution formation system that models the engine-out emission; and the pollution abatement system that models the behavior of the catalysts, the sensors, and other relevant equipment in the exhaust pipe.
All these models are control oriented models (COM), i.e., they model the input-output behavior of the systems with reasonable precision but low computational complexity They include, explicitly, all relevant transient (dynamic) effects. Typically, these COM are represented by systems of nonlinear differential equations. Only physics-based COM will be discussed, i.e., models that are based on physical principles and on a few experiments necessary to identify some key parameters.
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© 2010 Springer-Verlag Berlin Heidelberg
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Guzzella, L., Onder, C.H. (2010). Mean-Value Models. In: Introduction to Modeling and Control of Internal Combustion Engine Systems. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-10775-7_2
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DOI: https://doi.org/10.1007/978-3-642-10775-7_2
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-10774-0
Online ISBN: 978-3-642-10775-7
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