液位传感器容错控制方法研究

Liquid level sensor fault-tolerant control system research

摘要:

传统的PID(比例-积分-微分)控制法在液位过程控制中占据主要地位,但由于液位控制系统,特别是其系统传感器容易发生故障,使得PID控制法具有抗故障能力不足的缺陷,对生产生活造成重大损失,因此需采用容错控制方法使得液位传感器发生故障时仍能较为正常运行,提出状态观测器估计传感器液位故障值的容错控制方法,使状态观测器对故障状态产生观测跟踪,将故障状态作用于原控制器,并使原控制器弃置已经存在故障的传感器信号,使得故障值被抵消。

关键词:液位传感器;状态观测器;容错控制

Abstract:

Traditional PID (proportional integral differential) control occupied the main position in the process of liquid level control, but because of the liquid level control system, especially the system of the malfunction of the sensor is easy to make PID control method has the defects of lack of ability to resist failure, caused heavy losses of life in the production, so the need of fault diagnosis for liquid level control system running state and judge for abnormal situation, and provide the basis for system maintenance, according to the results of the diagnosis of the fault-tolerant control system makes the liquid level sensor failure could be run normally, still put forward state observer to estimate liquid level sensor fault values of fault-tolerant control system, the state observer for fault status tracking, and the fault state role in the original controller and make the original controller dumping existing fault of sensor signal, the fault value is offset.

Key words:liquid level sensor; Fault diagnosis; State observer; Fault-tolerant control