传感器和执行器故障检测与隔离方法

Method of fault detection and isolation for sensors and actuators

设计构造一种基于观测器的故障检测与定位方法,该方法对多输入多输出随机系统中传感器和执行器同时发生的故障或分别发生的故障进行检测和定位.为确定故障位置,先将原系统按传感器个数划分成若干子系统,使每个子系统与特定的传感器故障不相关而与其他传感器故障相关,再为每个子系统设计一个观测器,使其对特定的执行器故障不敏感而对其他执行器故障的敏感度最大.由此,利用观测器的信息统计量,经逻辑判别便可确定系统中传感器或执行器故障位置.

A novel observer-based approach for fault detection and location is proposed to detect and locate sensor faults and/or actuator faults in a multi-input multi-output stochastic system. To find fault locations, the original system is divided into several subsystems by the number of sensors in the system; each of which is made insensitive to a specified sensor fault while sensitive to other sensor faults. Furthermore, for each subsystem, an observer is designed with the observer innovation being made insensitive to specified actuator fault while sensitive to other actuator faults. Thus, from the statistics of the observer innovation, sensor faults and/or actuator faults can be located by logic inferring.