Fault detection method for executing mechanism of aero-engine control system based on sliding-mode observer

The invention provides an aero-engine control system executing mechanism fault detection method based on a sliding-mode observer, and the method comprises the steps: building a fault detection model based on the sliding-mode observer and a Luenberger observer for an aero-engine control system, so as to detect whether an executing mechanism in the aero-engine control system breaks down or not; and when it is determined that the executing mechanisms in the aero-engine control system break down, sliding-mode observers are designed for the multiple executing mechanisms of the aero-engine control system to form a special sliding-mode observer set so as to determine the executing mechanisms which break down in the aero-engine control system, and therefore fault isolation is achieved. According to the method, the sliding-mode observer is introduced, so that a nonlinear system and the condition with uncertainty can be better dealt with, the robustness of the system is improved, strong state estimation performance and