Since some years ago it is possible for Daimler AG to test power steering functionalities in a laboratory without the necessity to go directly to test vehicles. The today computational power allows computing vehicle dynamics and steering model on real time in order to connect mathematical models to the real device EPS. Some late improvements in the control strategy for the load motor led to a muck better-performance of the test benches. With help of this improvement a wider frequency range up to about 3 Hz can be tested. In addition to the possibility of simulating higher dynamical maneuvers today, the interaction of the EPS with other devices can be also evaluated by means of combined test benches. In the future, more detailed models for the steering will be developed in order include e.g. effects of ratio ripple and static/dynamic friction in the rack and in the ball screw. The validity of the HiL results for combined test benches must be checked intensively through comparison with real test results for special maneuvers like µ-split and corner braking. In addition to this, tools to test functionality related to driver assistance systems like lane keeping must be created.
Functional testing of an electric power steering using HiL simulations
2014
15 Seiten, Bilder, 5 Quellen
Aufsatz (Konferenz)
Englisch
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