基于PLC的水泵试验台电动阀门PI控制的实现

阀门控制是水泵试验台自动控制系统的一个关键。采用工业控制计算机,根据专家系统确定最优工况的各试验流量,通过泵参数测量仪接收传感器的数据,对采集的相应数据进行处理分析并向PLC发出指令,PLC采用PI控制方法,通过PI控制的参数设定及自整定。根据PI调节的输出与输入的偏差成正比,还与偏差对时间的积分成正比,消除了控制过程中产生的静差,实现了阀门闭环调节的精确控制。设计了监控软件、PLC软件、PLC与工控计算机的通信软件,实现了水泵试验的控制、数据采集和处理。试验表明,PI控制方法对水泵试验中流量的调节具有较好的稳定性和动态特性。

Realization of the electric valve's PI control in pump test-bed based on PLC

The control of electric valve is important to the auto-control system of the pump test-bed. The control system of electric valve adopts industrial computer, which determines the optimal operating conditions of the test flux according to expert system. With sensor data received from the pump parameter measuring instrument, the industrial computer analyses acquisition of the corresponding data and sends instructions to the PLC. In the PLC, the PI control method is adopted, with the enactment and self-adjustment of the PI parameter, in which the output of PI regulator is proportional to the import of the deviation, and is also proportional to the deviation time to the integral. The PI control method eliminates the static error of the control process and achieves a closed-loop adjustment of the precise Valve control. The monitoring software, PLC software, the communication software of PLC and industrial computer are designed. And the control, data acquisition and processing of pump test are achieved. The experiment indicates that the PI control method has fairly good stability and dynamic behavior to the flux adjustment in water pump testing.