Fault tolerant control for neutral systems with delayed inputs

In the present paper, the design problem of fault tolerant control for neutral time delay systems with delayed inputs is studied. The proposed control law is composed into two terms, a nominal control and an additive control. The first term presents the designed state feedback proposed to develop a control strategy which maintains the stability and the desired performance in closed loop system, even in presence of faults. In this case, the Linear Matrix Inequality (LMI) resolution method is applied to determine the feedback gain of the controller. The second one is based on adding an additive fault corrective term to the nominal law. Therefore, the use of unknown inputs observers (UIO) presents an efficient solution for the fault detection and estimation. Finally, the effectiveness of the proposed strategy is proven through a numerical example by the application of the theoretical results to a neutral time delay system with delayed inputs.