正负脉冲电压驱动的电磁螺纹插装阀动态特性分析

Analysis of Dynamic Response Characteristics of Solenoid Valve Driven by Positive and Negative Pulse Voltage

提出了一种基于PWM技术的正负脉冲电压控制策略,用于提高锥阀式电磁螺纹插装阀启闭动态响应速度,使其满足数字液压技术的要求。在分析电磁螺纹插装阀结构和工作原理基础上,建立了电磁螺纹插装阀的数学模型,并在AMESim软件中搭建电磁螺纹插装阀及其测试系统的多物理场耦合建模,研究不同正负脉冲电压持续时间条件下电磁螺纹插装阀线圈电流、阀芯位移、电磁力的变化规律,确定了电磁螺纹插装阀响应速度最快时正负脉冲电压控制策略的最优控制参数。利用半实物仿真系统搭建SCV硬件在环测试实验台,对所提正负脉冲控制策略进行验证。实验表明,与常规电压控制策略相比,当正负脉冲电压控制策略中正负脉冲电压持续时间都为10 ms时,电磁螺纹插装阀的开启时间由30 ms缩短到13.5 ms,其关闭时间由139 ms缩短到14 ms。研究结果为电磁螺纹插装阀的高响应化和数字液压技术的发展提供参考。

A positive and negative pulse voltage control strategy based on pulse width modulation(PWM)technology is proposed to improve the dynamic response speed of the solenoid screw-in cartridge valve(SCV)with poppet valve and meet the requirements of digital hydraulic technology.Based on the analysis of the structure and working principle of the solenoid screw-in cartridge valve,the mathematical model of the solenoid screw-in cartridge valve is established,and the multi-physical field coupling model of the electromagnetic threaded cartridge valve and its test system is built by AMESim.The variation laws of coil current,spool displacement,solenoid force of the SCV under different positive and negative pulse voltage durations are studied by the established model to determine the optimal control parameters of positive and negative pulse voltage control strategy when the response speed of SCV is the fastest.The hardware-in-the-loop test bench of SCV is built by semi-physical simulation system to verify the proposed positive and negative pulse control strategy.The experimental results indicate that compared with the conventional voltage control strategy,when the duration of positive and negative pulse voltage in the positive and negative pulse voltage control strategy is 10 ms,the opening and closing times of the SCV are reduced from 30 ms to 13.5 ms and 139 ms to 14 ms,respectively.The results of the study provide a reference for the high responsiveness of solenoid threaded cartridge valves and the development of digital hydraulics.