Fuzzy adaptive output feedback control for nonlinear MIMO systems based on observer

Fuzzy adaptive control method based on observer is proposed for a class of MIMO nonlinear systems. In the design process, the approximation capability of the fuzzy logic system is used, a kind of high-gain observer is introduced, and the output feedback control law and the parameter adaptive law are derived by using Lyapunov method. This control method considers the existence of approximation error and the system's external disturbance, which have an unknown boundary and need not the assumption of measurements of states. It is proved that the tracking performance of the output feedback control can achieve that of the state feedback control.