Mathematical Modeling and Simulation of Automotive Internal Combustion Engine

This paper presents a mathematical model of internal combustion engine dynamics namely air, fuel and rotational dynamics. Engine under study is naturally aspirated spark ignition four-stroke internal combustion engine with electronic fuel injection system. The purpose of model development is to provide a simple system level model for design of model-based control methods and fault diagnostics. Such type of model is known as mean value engine model. Novel features of this model are: constant volume cycle is used for approximation of combustion process; fittings equations and constants are avoided except only for estimation of frictional mean effective pressure. The model is verified at steady state with the data of engine test bed facility which results in 1-4% overall accuracy. Most of the models available in literature are specific to a certain brand or make because of their use of curve fittings, thus limiting their general use. Here a model is proposed which is not confined to a certain engine model; rather it is a generic one, thus having a significant research value.