Model-based approach for sensor fault-tolerant drive systems

Abstract

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

Implementation and Test of a Fault-Tolerant Wheel Hub Drive System for an Electric Vehicle

“…6. To avoid false alarms, these methods are applied to a voter, which evaluates the method and, if necessary, initiates error handling [12]. Fig.…”

“…To achieve this, current observers are used as residual generators, as also described in [16] and [17]. By analyzing the residuals, the faulty sensor can be isolated, and the respective phase current can be generated from the remaining sensors or from the current observer [12].…”

“…In this case, the fault detection for the rotor position is deactivated (especially in H-topologies). Conversely, the fault detection of the current measurement is deactivated to stop the mutual influence in the recognition of a rotor position error [12].…”