Active fault tolerant control with sliding mode observer

In this paper, the fault tolerant control problem is studied and the actuator fault resulting from loss of actuator effectiveness is considered. A fault tolerant controller consisting of two parts is proposed and each part can be designed separately. One part aims to maintain the stability and desired performance of the system and the other part is used to compensate the fault with the fault reconstruction information. The sliding mode observer is designed for the state estimation and the fault reconstruction. The regional pole placement is applied to assign the poles in a specified disk and improve the system performance. The Lyapunov function approach is considered for the design of the first part controller and the designed parameter matrix can be solved by linear matrix inequality (LMI) technique with multi-constraint conditions. Simulation studies are undertaken in an aircraft system to show the efficiency of the proposed scheme.