Research on Comprehensive Cascade Fault Diagnosis Technology for Vehicle Management System Actuator Control Subsystem Based on Associated Fault Mode Library

As vehicle management system, which consists of a large number of subsystems, is highly integrated, it is hard to find the source of cascading faults. In order to quickly locate fault(s) of vehicle management system to the line replaceable unit(s), this paper takes the actuator control subsystem of vehicle management system as an example. The actuator control subsystem is a three-tier cascade system, containing three vehicle management computers as the primary controller, three actuator controllers as the secondary controller, two ailerons as the lowest level devices. When a comprehensive analysis of performance monitoring built-in test faults was made, associated fault mode libraries were established based on different minimum maintenance units. After using simulation data and real fault data to test the model built by associated fault mode libraries, we applied the associated fault mode libraries to comprehensively diagnose the fault(s) of vehicle management system, and finally found the line replaceable unit(s) that caused the fault(s). The single positioning rate at which fault mode libraries can locate a fault to a single LRU is around 99.895%, and for comprehensive fault diagnosis, we got 100% correct rate. The results show that the method is reliable and effective and provides effective support for enhanced fault diagnosis of vehicle management system.