高速开关阀的复合PWM控制策略分析与优化

针对单一PWM控制的高速开关阀（HSV）存在响应慢和功耗大的问题，从信号产生机理出发，提出了一种复合PWM控制策略，该复合PWM由基准PWM、激励PWM、高频PWM及反向PWM组成。首先，给出复合PWM的作用机制与工作原理；其次，通过仿真分析了激励PWM、高频PWM及反向PWM的占空比在不同工况下对高速开关阀性能的影响规律；最后，分别为激励PWM、高频PWM及反向PWM的占空比设计了相应的基于状态量反馈的闭环控制器。结果表明:与单一PWM控制相比，所提出的复合PWM控制器可以有效减少线圈的功耗和阀芯的关闭时间，线圈电流在阀芯最大开口维持阶段降低约80%，阀芯关闭时间减少约62.5%。 

Analysis and optimization on compound PWM control strategy of high-speed on/off valve

Aimed at slow response and high-power consumption of high-speed on/off valve (HSV) controlled by single PWM signal, a compound PWM control strategy proposed from the point of view of the digital signal generation mechanism, which consists of reference PWM, excitation PWM, high-frequency PWM and reverse PWM. First, mechanism and working principle of compound PWM control strategy are given. Next, the influence rules of duty cycle of excitation PWM, high-frequency PWM and reverse PWM signals on performance of HSV are studied by simulation under different boundary conditions. Finally, the closed-loop controllers of these PWM's duty cycle are designed based on state variable feedback. Simulation results show that the proposed compound PWM controller can reduce power consumption and closing time of HSV effectively. The coil current is reduced by 80% at maximum position of the ball valve, and closing time of HSV is shortened by 62.5% approximately, compared with single PWM control strategy.