In this work, preliminary results concerning the development of a fault-tolerant control scheme for hypersonic vehicles are presented to provide stable tracking of a suitable trajectory that may allow recovery from inlet unstart conditions. The fault-tolerant module is integrated in a previously developed flight control architecture that comprises a robust adaptive inner-loop controller and a self-optimizing guidance scheme. First, the performance of the baseline robust adaptive controller during the mode transition from start to unstart regime is analyzed. It is shown that the inner-loop controller succeeds in maintaining level flight in unstart regime until the limits of performance of the vehicles are reached. The selection of reference trajectories that maximize the endurance of the vehicle is obtained as a solution of an optimal control problem. The design of an adaptive tracking controller to follow a sub-optimal modification of these reference trajectories and its implementation in the flight controller is presented and simulation results are discussed.
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