Electro-mechanical braking force actuators are considered to substitute conventional brake boosters in electric and hybrid-electric vehicles in the forthcoming years. Due to nonlinearities like stick-slip friction effects and parameter uncertainties on one hand and the need for precise tracking of the master-cylinder position on the other hand, the controller design is a non-trivial task. First the system is analyzed in detail, then the main use-cases are identified. A model is set up and validated against test-rig measurements. A sliding mode control law for the braking-force actuator is derived from a sufficiently detailed model of the vehicles brake system dynamics. It features a simple structure with few controller parameters leading to a remarkably reduced effort in controller parametrization. Since the controller is robust with respect to the model uncertainties, no adaptation of the controller is needed during operation. The experimental results demonstrate that the sliding mode controller concept is superior to a standard PI controller with a setting found by the well-known T-sum tuning rule.
Modelling, control & implementation of an electro-mechanic braking force actuator for HEV and EV
2013
6 Seiten, Bilder, Tabellen, Quellen
Aufsatz (Konferenz)
Englisch
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