Nonsingular Fixed-Time Fault-Tolerant Fuzzy Control for Switched Uncertain Nonlinear Systems

This article investigates the adaptive fixed-time fault-tolerant tracking fuzzy control issue for nonlinear switched systems with dynamic uncertainties. Actuator faults considered in this article simultaneously contain the loss of effectiveness and time-varying bias fault depending on the switching signal. The generated scheme extends the fixed-time convergence to switched nonlinear systems with unmodeled dynamics. An improved adaptive fixed-time fault-tolerant controller is proposed by employing the backstepping method and fuzzy logic estimator. In particular, the presented framework removes the singularity, and the convergence time is assignable for any initial condition. Finally, a numerical simulation example and a resistor-capacitor-inductor circuit system example are given to prove the system output can converge to a desired trajectory within a fixed time.