Implementation details and test results for a transient engine dynamometer and hardware in the loop vehicle model

A state-of-the-art transient dynamometer engine test system has been developed in the Powertrain Control Research Laboratory (PCRL) at the University of Wisconsin-Madison. This system includes a hydrostatic dynamometer capable of excitation in excess of 300 Hz, integrated with a controller running the dynamic driveline equations in real time to calculate the instantaneous engine loads during transients. This hardware-in-the-loop (HIL) virtual engine loading system can be a powerful tool for use in engine and powertrain research, as well as control and diagnostic algorithm development and validation. This paper describes the system and presents experimental open loop and closed loop HIL data from the transient dynamometer system that represents the virtual vehicle