Adaptive fuzzy output feedback control for MIMO switched nonlinear systems with prescribed performances

This paper proposes an adaptive fuzzy output-feedback control approach for a class of uncertain multiple-input and multiple-output (MIMO) switched nonlinear systems with prescribed performance and immeasurable states. In this research, fuzzy logic systems are used to identify the unknown nonlinear functions, a fuzzy switched state observer is established to observe the unmeasured states. Based on backstepping technique and the prescribed performance theory, a new adaptive fuzzy control method with prescribed performance is developed. It is proved that the proposed control approach can ensure that all the signals of the resulting closed-loop system are bounded, and the tracking errors are within the prescribed performance bounds for all times. Simulation studies illustrate the effectiveness of the proposed approach.