Observer-based adaptive control for nonlinear switched nonstrict-feedback systems

This paper studies the issue of observer-based adaptive fuzzy control issue for a class of switched time-delay nonlinear systems in nonstrict-feedback form. Firstly, an adaptive output feedback fuzzy backstepping-based control approach is proposed for the switched nonstrict-feedback system. Furthermore, fuzzy logic systems (FLSs) are utilized to model the unknown nonlinear system functions, and backstepping and adaptive technique are applied to construct output feedback controllers for all switched subsystems. The proposed controllers insure that all of the switched signals in the whole closed-loop system are semi-globally uniformly ultimately bounded. In the end, simulation results are given to show the effectiveness of the obtained method.