This paper addresses the problems of observerbased fault reconstruction and fault-tolerant control for TakagiSugeno fuzzy descriptor systems subject to time delays and external disturbances. A novel fuzzy descriptor learning observer is constructed to achieve simultaneous reconstruction of system states and actuator faults. Sufficient conditions for existence of the proposed observer are explicitly provided. Utilizing the reconstructed fault information, a reconfigurable fuzzy faulttolerant controller based on the separation property is designed to compensate for the impact of actuator faults on system performance by stabilizing the closed-loop system. In addition, the design of the fault reconstruction observer and the fault-tolerant controller is formulated in terms of linear matrix inequalities that can be conveniently solved using convex optimization techniques. At last, simulation results on a truck trailer system are presented to verify the effectiveness of the proposed approaches.
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