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Fault-tolerant Electric Vehicle during Multi-current sensor failure by achieving IFOC of IM Drive

Electric vehicles (EVs) require greater reliability in torque accuracy for a better dynamics and safety. Any EV must meet the stringent functional safety standards of ISO 26262. However, in the case of a current sensor failure, it is more likely that the said safety standards are not met. In this article, an algorithm is developed based on the measurements of machine's terminal voltages and power constraints which ensures the required torque accuracy for a high-performance Induction Motor based EV at the event of a current sensor failure. When the sensors are healthy, standard current sensor based indirect field-oriented control (IFOC) is implemented. However, at the event of one or more number of current sensor failure, voltage sensors and power constraints based FOC is implemented. The experimental results confirm that with the proposed algorithm the drive does not lose the desired dynamics of the FOC and ensures torque accuracy at the event of a current sensor failure even during starting and high-speed operations.