电气比例阀压力自校正控制策略研究

电气比例阀压力输出控制具有时变、非线性特点,常规PID控制方法很难适应其响应快速、控制精确高的要求,深入分析了电气比例阀结构与工作原理,建立了电气比例阀非线性数学模型。提出采用PID参数自适应整定的模糊PID控制策略,详细分析了模糊PID控制器的设计方法。在软件MATLAB/Simulink中对控制系统进行了设计与仿真,并将控制效果与常规PID控制和模糊控制效果进行了比较分析。结果表明:模糊PID控制算法能使比例阀压力输出控制具有更好的动静态特性和自适应能力。

Pressure Self-tuning Control Strategy of Electric Proportional Valve

 Pressure output control of electric proportional valve has characteristics of time variation and non-linearity. Conventional PID control methods are difficult to meet the requirements of fast response and precise control. For this reason, we establish a mathematical model of electric proportional valve by analyzing structure and working principle of electric proportional valve. The fuzzy PID control strategy is proposed based on adaptive PID parameter tuning. The design method of fuzzy PID controller is analyzed in detail. A control system is designed and simulated in the software MATLAB/Simulink, and we compare the control effect with conventional PID control effect and fuzzy control effect. The results show that the fuzzy PID control algorithm can make the proportional valve pressure output control have better dynamic and static characteristics and adaptive ability.