Abstract
Keywords: HiL Simulator, Crank Angle Synchronous Engine Model, Cylinder-by-Cylinder Engine Model, Cylinder Pressure Based Engine Management Systems
This contribution presents a hardware-in-the-loop (HiL) simulator for function development and testing of future cylinder pressure based engine management systems. The simulator is based on a crank-angle synchronous cylinder-by-cylinder model of a CRDI diesel engine. It is divided into subsystems for the air and exhaust path, the exhaust turbocharger and the cylinder group. As distributed parameter models are computationally still too timeconsuming for real-time applications a lumped parameter approach is used. The combustion process is approximated by an empirical model. Pilot and main injection are treated separately. The overall engine model is implemented into a dSPACE real-time computer system. Together with an engine control unit, real actuator components and dummy loads the multiprocessor system forms the hardware configuration of the HiL test system. The HiL simulator is validated using measurements of an Opel 1.9L common rail diesel engine. Emphasis is placed on the correct representation of cylinder pressure characteristics (e.g. mean indicated pressure, location of mass fraction burned 50%) which are essential for feedback combustion control.