双电磁铁比例方向阀零位位置控制死区补偿方法研究

Dead zone compensation method of zero position control of double electromagnet proportional direction valve

针对双电磁铁驱动并带有阀心位置传感器的比例方向阀位置控制在零位存在死区的问题,运用Simulink对阀心位置控制系统进行了建模,对零位死区的形成原因进行了研究。通过仿真,对形成零位死区的各个影响因素对死区时间的影响程度进行了分析;基于不同的影响因素,提出了零位电流阶跃与衰减式位置指令跳跃的补偿策略;比较了该控制策略与其他控制方法对阀心位置的控制性能,最后通过实验进行了验证。研究结果表明:采用该位置控制补偿策略可以有效地消除由于系统非线性和时变性所带来的比例方向阀的零位位置控制死区,改善了阀心位置的响应波形。

Aiming at the problem of proportional directional valve position control in zero position,which is driven by two electromagnet and with valve center position sensor, the valve center position control system was modeled by Simulink, the cause of zero dead zone was studied. The influence of the factors forming zero dead zone on the time of dead zone was analyzed by simulation. The compensation strategies of zero current step and attenuated position instruction jump were proposed according to different factors, and the compensation performances of different compensation methods were compared. Finally, it was verified by experiments.The results indicate that the dead zone of zero position control and response waveform of the valve,which due to the nonlinear and time-varying system can be effectively eliminated by the position control compensation method.