Integrated Fault Estimation and Accommodation Design for Discrete-Time Takagi–Sugeno Fuzzy Systems With Actuator Faults

Abstract

This paper addresses the problem of integrated robust \nfault estimation (FE) and accommodation for discrete-time \nTakagi–Sugeno (T–S) fuzzy systems. First, a multiconstrained \nreduced-order FE observer (RFEO) is proposed to achieve FE for \ndiscrete-time T–S fuzzy models with actuator faults. Based on the \nRFEO, a new fault estimator is constructed. Then, using the information \nof online FE, a new approach for fault accommodation \nbased on fuzzy-dynamic output feedback is designed to compensate \nfor the effect of faults by stabilizing the closed-loop systems. Moreover, \nthe RFEO and the dynamic output feedback fault-tolerant \ncontroller are designed separately, such that their design parameters \ncan be calculated readily. Simulation results are presented to \nillustrate our contributions.