基于PWM技术的开关电磁阀流量特性研究

Research on Flow Characteristic of Switch Solenoid Valve Based on PWM Technology

在分析开关电磁阀工作过程的基础上,给出了基于PWM技术控制开关电磁阀流量时,根据开关电磁阀的临界频率和截止频率设计PWM频率的方法。基于开关电磁阀的电压平衡方程、运动学方程以及流体方程导出了开关电磁阀的临界频率和截止频率的表达式。实验结果表明:利用开关电磁阀模型计算的临界频率和截止频率与实测值基本一致,误差达到了工程设计的标准。并分析了占空比、流量与PWM控制频率之间的关系。

Based on analyzing the working process of switch solenoid valve, the design method of PWM frequency based on the valve’s critical frequency and cut-off frequency was given, by using PWM technology to control the valve.Using the switch valve’s voltage balance equation, kinematics equation and fluid equation, the expressions of the critical frequency and cut-off frequency were given.The experimental results show that the critical frequency and cut-off frequency are basically the same with the measured values and the error meets engineering design standards.The relationship of the PWM duty ratio, the flow and the PWM frequency was ana-lyzed.