Extending of the Duty Ratio Range of Pulse Width Modulation Control on High Speed on-off Valve

Abstract

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.