False alarm mechanism and control of aircraft hydraulic system

Built-in-Test (BIT) is widely used in aircraft to improve the system's reliability and safety. However, the false alarm of BIT makes it difficult to practical. After investigating the mechanism of false alarm of BIT from sensor failure, signal coupling, unreasonable threshold and uncertainty of fault decision method, an improved fault diagnosis method integrated with sensor redundancy configuration, delay decision and dynamic threshold is proposed. The result from the ground simulation platform indicates the method's effectiveness.