Adaptive Control of Systems with Unknown Dead-zones

Dead-zone nonlinear characteristics are encountered in many physical components of control systems. They are usually unknown and may vary with time. A robust model reference adaptive controller with an adaptive inverse of dead-zone is developed. Based on the parameter match equation of adaptive control, the tracking error of closed loop system and normalized parameter estimate error is given. It is proved that all of the signals in the closed loop are bounded. A missile automatic pilot with the presented adaptive control scheme is simulated. Simulations show the perfect tracking performance of closed loop system.