比值控制系统电磁阀故障诊断与容错控制

Fault diagnosis and fault-tolerant control of solenoid valves in ratio control systems

目的:提出一种基于数据驱动的比值控制系统电磁阀故障诊断与容错控制方法。方法:将正常信号波动变化率作为故障检测的依据,利用比值系统故障传播的滞后特性建立故障定位算法。利用故障发生前后信号的差值及比值建立故障估计算法。利用故障调节区间内的响应超调量建立故障分离算法。根据故障诊断结果重构控制信号实现容错控制。结果:该方法故障检测准确率、定位准确率和分离准确率分别为96%,98.6%和96%,故障估计误差小于0.06%,容错补偿误差小于0.5%、结论:该方法可应用于一般比值系统电磁阀的故障诊断和容错控制,对于微弱故障能实现精准诊断和逆补偿,具有实时性强、运算量少及诊断精度高等优点。

Aims:A data-driven fault diagnosis and fault-tolerant control method of the solenoid valves of ratio control systems was proposed.Methods:The normal signal fluctuation rate was used as the basis for fault detection.A fault location algorithm was established according to the characteristic of fault propagation in the ratio system.A fault estimation algorithm was established by using the difference and ratio of the signals before and after the fault occurred.A fault separation algorithm was established by using the response overshoot in the fault adjustment interval.The fault tolerance control was realized by reconstructing the control signal according to the fault diagnosis results.Results:The fault detection accuracy,positioning accuracy,and separation accuracy of this method were 96%,98.6%,and 96%,respectively.The fault estimation error was less than 0.06%;and the fault tolerance compensation error was less than 0.5%.Conclusions:This method can be applied to the fault diagnosis and fault-tolerant control of solenoid valves in the general ratio system,and can achieve accurate diagnosis and inverse compensation for weak faults,which has the advantages of real-time,less computation and high diagnostic accuracy.