Fuzzy fault-tolerant attitude tracking control for Mars Entry Vehicle under partial loss of actuator effectiveness

In this paper, we design a fuzzy fault-tolerant tracking controller for the Mars Entry Vehicle (MEV) with the partial failure of actuator, external disturbance and input delays. Firstly, we divide the attitude system of MEV into slow subsystem and fast subsystem. By using the slow subsystem, we can get angular velocity and then choose this angular velocity as the reference angular velocity for the fast subsystem. By designing a robust state feedback control in the fast subsystem, a algorithm of delay-dependent actuator effectiveness coefficient-dependent simultaneously is obtained. Thus, the controller can not only be sensitive to time delay and attenuate the disturbances, but also be able to tolerate partial loss of actuator effectiveness. Finally, numerical simulation are using to prove the method effectiveness.