The paper presents an approach to reliably detect and treat sensor faults in drive systems. For detecting errors in current and rotor position sensors, model-based methods (sensorless position estimation, current observers) are used. Sensor faults in the drive system may cause erroneous or oscillating torques. In vehicles with wheel hub drives on the rear axle and without additional driving safety systems, such faults could even result in driving conditions that are difficult to control. The error detection system is verified by measurements on a test bench. Vehicle tests on a test track prove the effectiveness of the procedures for in-vehicle use
In electric vehicles with wheel hub drives, fault tolerance of the drives is a desirable feature. This paper reports on design, implementation and tests of a fault tolerant multiphase wheel-hub drive system. Most suitable topologies of motor and converter are selected, and a model-based fault detection is described. In addition, the handling of faults in order to avoid unwanted braking or oscillating torque is discussed. The complete fault-tolerant wheel hub drive is tested on a test bench, and experimental results from a test in a concept car demonstrate the effectiveness of the solution
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