A mathematical model of proportional lowering valve was built to meet the requirement of electro-hydraulic lifter on high-power tractors. To improve the response characteristic and control accuracy of the hydraulic system, the model of the valve was established based on state space method. Then the influence on the dynamic characteristics of the valve was analyzed with respect to the parameter varieties of the components with the simulation and 4 steps Runge - Kutta method was adopted with Matlab/Simulink edited so as to obtain the optimum combination of the valve parameters. At last, the diameter of damping hole on pilot valve was 1. 0 mm, the diameter of damping hole on main valve was 1. 2 mm, the diameter of mainvalve larger face was 20 mm, and the diameter of pilot valve was 8 mm.%为改善液压系统响应特性,提高控制精度,基于状态空间法,建立了大功率拖拉机电液提升器比例下降阀的动态数学模型及仿真模型,在Matlab/Simulink中进行仿真及参数优化设计,选用四阶龙格库塔算法,得到阀结构参数和性能参数对开闭过程、流量变化动态特性的影响.最终确定先导阀阻尼孔直径为1.0mm,主阀阻尼孔直径为1.2 mm,主阀大端直径为20 mm,先导阀阀芯直径为8 mm.
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