Analysis of modeling and simulation methodologies for vehicular propulsion systems

In this paper, three different modeling and simulation methods (forward dynamic, quasi-static backwards, and inverse dynamic) will be compared and the simulation results using these methods will be analyzed. The base line vehicle used in this paper consists of a conventional drive train with a natural aspirated engine. From a Forward Dynamic (FDM) model, a Forward Quasi-static (FQM) and a Backward Quasi-static Model (BQM) for the engine will be derived. The difference in simulation results for the base line vehicle used on representative driving cycles (NEDC, FTP75) will be discussed. The forward dynamic model contains a scalable engine model based on physical laws. The accuracy of this model will be investigated by comparing simulation results with measured quasi-static efficiency data of actual engines. The work presented in this paper will form the basis to develop a modeling, simulation and design method which can be used for quick (alternative, or hybrid) drive train specification, or (supervisory) control calibration with sufficient accuracy.

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