Fault detection and isolation system and method

Abstract

The invention discloses a fault detection and isolation system and a method. The system and method monitor the fault occurrence probability of a FDI system output by introducing an active monitoring module. The active monitoring module applies an external excitation signal to an actuator when the failure occurrence probability is greater than a failure occurrence probability threshold. If the measured value of the actuator control amount is not changed after the application of the external excitation signal, the actuator is indeed faulty, so that the fault condition of the actuator can be quickly confirmed. If the measured value of the actuator control amount does not match the measured value under normal conditions after the application of the external excitation signal, the actuator is not faulty. The fault detection and isolation system and the method provided by the invention can solve the problem of diagnostic fuzzy and false alarm caused by failure of redundant actuator, and improve the fault detection speed and robustness.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis, in particular to a fault detection and isolation system and method. Background technique [0002] Fault detection and isolation (FDI) is an important and challenging problem in many engineering applications. In the field of aeronautical and aerospace engineering, although the flight system is composed of high-level redundant fault-tolerant hardware failure Established with software faults, the robust fault diagnosis system is still used in the flight safety assessment of monitors and aircraft. In some cases, if a fault can be detected and identified quickly, then appropriate reconfiguration control actions can be taken. [0003] Fault isolation refers to the technical measures that the aircraft judges the normal working status of each part of the system or equipment subsystems under the real-time working environment, and narrows down to the final judgment of the faulty subsystem or a cer...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a system and method for fault detection and isolation, which can solve the problem of ambiguous diagnosis and false alarm caused by faults of redundant actuators, and improve the speed of fault detection

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