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Robust lateral controller for four-wheel steer cars with actuator constraints

Leith, D.J. and Leithead, W.E. and Vilaplana, M. (2005) Robust lateral controller for four-wheel steer cars with actuator constraints. In: Proceedings of the 44th IEEE Conference on Decision and Control, 2005 and 2005 European Control Conference. CDC-ECC '05. IEEE, pp. 5101-5106. ISBN 0-7803-9567-0

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Abstract

In this paper we study a new steering controller for cars equipped with 4-wheel steer-by-wire. The controller commands front and rear steering angles with the objective of tracking reference yaw rate and sideslip signals corresponding to the desired vehicle handling behaviour. The controller compensates for changes in vehicle dynamics with forward speed and incorporates an anti-windup scheme to mitigate the effects of the saturation or failure of the rear steering actuators. We analyse the robust stability and performance of the resulting non-linear control system.