### Active fault tolerant control of aeroengine afterburner control system

• Received:2022-09-28 Revised:2023-02-01 Online:2023-02-06 Published:2023-02-06
• Supported by:
National Key Basic Research Program of China;National Science and Technology Major Project

Abstract: To improve the fault tolerance and reliability of fuel control system of aeroengine afterburner, a novel adaptive integral robust fault tolerant control(AIRFTC) is constructed for fuel metering unit(FMU) with unmatched disturbances, sensor fault and internal leakage fault. The proposed nonlinear unknown input observer(NUIO) based on adaptive parameter estimation can effectively estimate the system state and sensor fault, while not moderated by unmatched disturbances and internal leakage fault. The introduced filter error function combines the integral robust control with adaptive control to address internal leakage faults under sensor noise and unmatched disturbances. By Lyapunov method, we can prove that the displacement of FMU can track reference signal asymptotically. The simulation results show that the control performances of AIRFTC are as low as 0.0356, 0.0018, 0.0136, 25.1973 and 4×10-4 in terms of maximum tracking error, the average tracking error, the standard value of tracking error, ITAE and ITSE, respectively. This paper can provide a novel method and glimpse for aeroengine health management.

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