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For the development of complex control algorithms and strategies the engine and powertrain test bed offers a number of advantages over the development in the prototype vehicle. The paper discusses how state-of-the-art simulation techniques can contribute to a continuous development process, which is based upon offline simulation using hardware in the loop, the utilization of modern test bed technology up to vehicle adjustment. The integration of hardware-in-the-loop testing together with vehicle and transmission simulation on the testbed allows to speed up the optimization of fuel consumption, emissions and driveability in an early stage in the development process. The available software tools are presented and application examples are given.

The new generation of ZÖLLNER dynamometers has been developed in order to fulfill the steadily rising needs for the testing of prime movers (especially in engine development). These requirements concern above all a simple operating interface, high stability of steady state operating points, high reproducibility of measurements as well as short response times for instationary applications. In order to achieve these aims a number of development goals were defined: New operating and parameter configuration concept Intelligent software for optimized controller adjustment Power electronics with fully controlled thyristor bridge Optimization of exciter coils (regarding inductivity and resistance) The new performance testing devices were themselves put to test - this report describes the field test results achieved with an eddy current dynamometer B-220 AE (with controller PRE 5) on a test bed at AVL in Graz / Austria.