Abstract
This paper focuses on the redundancy of angular speed sensors in an electric vehicle with two independent single wheel drives at the rear axle. Operation of both drives with a single angular speed sensor, e.g. in case of a sensor fault, is investigated. By applying a speed-sensorless control algorithm, operation of the faulty single wheel drive is still possible. Although speed-sensorless control of induction machines is state of the art and has been demonstrated by a variety of publications, stable operation at zero and very low speed is still not reliably possible. In this paper, a stable approach for speed-sensorless control at low and zero speed is proposed, which uses the speed sensor information of the other single wheel drive and the overall vehicle physics. Based on a detailed mechanical drive train model, the influence of the induction machine control strategy and the different road surfaces on the drive dynamics and the resulting torsional vibrations are investigated.
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