Current sensor fault-tolerant control scheme for induction machine in electric vehicle applications using RISE-algebraic estimation approach

This paper describes an active current sensor fault-tolerant control (FTC) scheme for an induction motor (IM) drives that propels an Electric Vehicle (EV). The proposed strategy includes two parts : one part for fault detection and isolation (FDI) against the line current sensor failures and the other for the FTC reconfiguration. A model based FDI method is developed consisting on a combination of the Robust Integral Sign of the Error (RISE) observer with the algebraic approach to estimate the current residuals dynamics in the stationary reference frame. After detecting the fault occurrence, a decision-making logic unit is then performed to identify the faulty sensors and simultaneously calculates the appropriate current signal that will be used by a Field-Oriented Control (FOC) based speed control scheme. The proposed sensor FTC strategy can be universally applied with any speed control schemes involving IM drives. Besides, the developed fault estimator is simple with a 1-D model, depending only on the input-output measurements and their derivatives and do not require a bank of observers. The robustness of the generated residuals to load torque disturbances and the ability of diagnosing the recovery of a sensor from a fault are also demonstrated. Simulation are carried out to show the effectiveness of the proposed FTC architecture.