Tailored Cylinder Models for System Level Engine Modelling

The model of the cylinder block represents the most challenging part of the engine model when establishing appropriate balance between the level of detail of the model and its computational speed. Furthermore its coupling to the gas path model significantly influences the performance of the overall engine model. The paper addresses various couplings of the 0D gas path models and the surrogate and the crank angle resolved cylinder block models. In addition two innovative coupling approaches are presented and discussed: 1. coupling of the mean value gas path model and the crank angle resolved cylinder model and 2. time domain decoupled interaction between the filling and emptying gas path model and the crank angle resolved cylinder model. In the paper physical background of the models is presented along with their characteristics and computational performances in terms of RT factors.