智能电气阀门定位器的设计与自适应控制

Design of Intelligent Electrical-Pneumatic Valve Positioner and Adaptive Control

针对传统阀门定位器的调节过程繁琐,精度较差的劣势,结合系统低功耗的要求,设计了MSP430F149作为微处理器的智能阀门定位器的硬件和软件;对阀门和气动执行器设备不确定性,提出了PID参数自整定的设计方法,自动辨识系统所需的控制参数,并引入模糊自适应算法进行在线校正;采用综合Bang-bang控制和模糊自适应算法的自适应控制器,满足了系统快速性和控制精度的要求;实验结果表明:控制系统调节时间约4s,超调量控制在2%之内,具有理论和应用价值。

Traditional valve positioner is difficult to adjust in application,and its precision is unsatisfied.With the idea of low power consumption,the hardware and software of intelligent valve positioner is designed based on the micro controller MSP430F149.With regard to uncertainty of valve and pneumatic actuator,PID parameter tuning method is bring out,it can automatically identify PID parameter through manual key press operation to avoid many live-debugging processes.Fuzzy adaptive arithmetic is adopted to calibrate control parameter on line.The complex controller combines the Bang-bang control and fuzzy adaptive arithmetic,satisfies the requirements of fast-position and high precision.Experiment indicates the settling time of the system is 4 seconds;the overshoot is confined to 2%,thus the method is valuable in theory and application.