农机自动驾驶比例电磁阀精细控制的优化方法

为解决目前脉冲宽度调制（pulse width modulation, PWM）比例电磁阀控制方式的电流纹波大、控制精度不高等问题，本文提出采用双PWM对比例电磁阀进行控制，其中双PWM是指在一个PWM周期内，增加第二个调制。结果表明，双PWM调制模块工作提高了比例电磁阀的控制精准度，减小了比例电磁阀的电流纹波，从而减少对比例电磁阀的冲击，增加了电磁阀的寿命，降低了产品零件的维护和更换成本；而且在非道路机械产品换挡时使控制电流波动降低近1/3，有效减缓了换挡引起的速度突变，消除了换挡顿挫感。 通讯作者: 张胜荣（https://orcid.org/0000-0003-4228-872X） E-mail: shell@lianfly.com
Abstract: To solve the problems of pulse width modulation (PWM) proportional solenoid valve control mode, such as large current ripple and low control precision, a method of dual PWM was adopted to control the proportional solenoid valve. Here, the dual PWM meant a second modulation was added in one PWM period. The results showed that this dual PWM can improve the control precision of the proportional solenoid valve, reduce the current ripple of proportional electromagnet, thus reducing the impulse of the proportional solenoid valve. As a result, it increased the life of solenoid valve, reduced the maintenance and replacement cost of product parts, and decreased the current fluctuation of the non-road mechanical products by nearly 1/3 in the shift, effectively slowing down the velocity jump caused by shifting and eliminating the sense of shift and frustration. Key words: automatic drive proportional electromagnetic valve pulse width modulation