A nonlinear dynamic modelling of SI engines for controller design

A control-oriented nonlinear dynamic SI engine model is developed to represent a spark-ignited engine over a wide range of operating conditions. The model includes intake manifold dynamics, fuel film dynamics, and engine rotational dynamics with transport delays inherent in the four-stroke engine cycles. The model is mathematically compact enough to run in real time, and can be used as an embedded model within a control algorithm or an observer. The model is validated with engine-dynamometer experimental data in steady and transient operating conditions, and its accuracy over a wide operating range is proved to be within ±5% Also, the model can be used in the design and development of a powertrain controller.