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控制系统中的传感器、执行器和被控对象的故障检测与诊断往往是把执行器和被控对象视为一个整体来研究,这不利于故障的决策与处理.对此,设计了非线性系统故障诊断的滑模观测器,提出一种诊断被控对象故障的方法,即对非线性系统和执行器同时进行观测,根据两观测器残差的变化情况判断出非线性系统中传感器、执行器和被控对象故障.最后以单输入单输出非线性系统为例进行仿真,验证了该方法的有效性.
In the control system, the fault detection and diagnosis of the sensors, actuators and controlled objects often study the actuator and the controlled object as a whole, which is not conducive to the decision-making and processing of the faults.In this context, a nonlinear system A sliding mode observer for fault diagnosis is proposed to diagnose the fault of the controlled object by observing both the nonlinear system and the actuator at the same time. According to the variation of the observer residuals, the sensors and actuators in the nonlinear system And fault of the controlled object.Finally, the simulation of a single-input and single-output nonlinear system is performed to verify the effectiveness of the proposed method.