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介绍了国外一种基于双阀芯控制的新型电液比例阀的结构和工作原理,并与基于单阀芯控制模式的普通液压阀进行了比较;在考虑了稳态液动力、瞬态液动力、弹簧预压缩、阀泄漏和重力的基础上,建立了该阀的数学模型,得出了系统的传递函数,应用Matlab对其动态特性进行了仿真研究,得到了阶跃响应曲线和伯德图。结果表明相对于普通液压阀的单阀芯控制模式,双阀芯控制模式更加灵活有效;主阀芯一端弹簧的预压缩和主阀芯所受的重力在该阀的动态特性分析中可以忽略不计,该阀具有良好的响应速度和理想的带宽,并且影响响应速度和带宽的主要因素是先导阀的流量增益和主阀芯一端弹簧的弹性系数。
The structure and working principle of a new electro-hydraulic proportional valve based on dual spool control are introduced and compared with the conventional hydraulic valves based on the single spool control mode. After considering the steady state hydrodynamic, transient hydrodynamic , Spring precompression, valve leakage and gravity, the mathematical model of the valve was established and the transfer function of the system was obtained. The dynamic characteristics of the valve were simulated by Matlab, and the step response curve and Byrd diagram . The results show that the dual valve spool control mode is more flexible and effective than the single valve spool control mode of the conventional hydraulic valve. The precompression of the spring at one end of the main spool and the gravity of the main spool are negligible in the dynamic analysis of the valve The valve has good response speed and ideal bandwidth, and the main factors affecting response speed and bandwidth are the flow gain of the pilot valve and the spring rate of the spring at one end of the main spool.