中文摘要：

高速开关阀在高频脉宽调制（Pulse width modulation,PWM）控制下阀芯可悬浮在某一开度,调节占空比即可改变阀口开度,实现对流量和压力的线性控制,因此在车辆控制系统得到广泛应用。但我国自主开发的高速开关阀PWM控制的有效占空比工作范围小,阀芯较易全开或全闭,为提高阀的可控性和控制精度,需要研究拓宽占空比的工作范围。基于汽车电子稳定程序（Electronic stability program,ESP）的高速开关阀,深入分析阀芯液动力的影响因素,应用AMESim、Matlab软件建立ESP液压系统的联合仿真模型,并经过试验验证,通过仿真得出阀座锥角、入口孔径对阀芯位移的影响,提出拓宽PWM控制占空比有效工作范围的关键参数,为高速开关阀的设计开发提供参考依据。

英文摘要：

High speed on-off valve controlled by pulse width modulation（PWM） of high frequency can get the valve floated at a certain orifice which is adjusted by changing the duty ratio.In consequence,the flow and pressure can be controlled proportionally by the valve so as to it is used widely in vehicle control system.But the duty ratio range of PWM control on high speed on-off valve designed by our country is narrow,and the valve is easy to open and close completely.In order to improve the controllability and control precision of the valve,it is necessary to study how to extend the duty ratio range.Based on the high speed on-off valve for the automotive electronic stability program（ESP）,the flow force of the valve is in-depth analyzed in this paper.Besides,the co-simulation model of hydraulic control unit is established by AMESim and Matlab,which is also verified by test.Consequently,it is shown that the effect of the poppet angle of valve body and diameter of inlet on the displacement of valve.The crucial parameter on the extending of the duty ratio range is acquired.The result can provide references for the design and development of the high speed on-off valve.