WSEAS Transactions on Systems and Control
Print ISSN: 1991-8763, E-ISSN: 2224-2856
Volume 11, 2016
Research on the High-speed On/off Valve with High Pressure and Large Flow Rate Based on Phase Shift PWM Control
Authors: , , ,
Abstract: To reduce the chatter amplitude and widen the range of the effective duty cycle of the high-speed on/off valve in digital variable displacement pump systems, this paper presents a new strategy, phase shift PWM (PS-PWM) control strategy. The theoretical and simulation analysis results indicate that this strategy could improve the dynamic response speed and steady precision significantly. In addition, to improve the control precision and reduce the leakage under high pressure and large flow rate, a new type of high-speed on/off valve with two DOF of the spool is developed. The duty cycle of this valve is increased significantly, which reaches 0~90%. The floating compensation mechanism of this valve is designed to realize the wear self-compensation. So this valve can guarantee the high control precision, low leakage and high efficiency under high pressure and large flow rate.
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Keywords: Digital variable displacement pump system, High-speed on/off valve, Duty cycle, Control precision, Phase shift PWM, Two DOF of the spool, Floating compensation mechanism, Wear self-compensation
Pages: 71-80
WSEAS Transactions on Systems and Control, ISSN / E-ISSN: 1991-8763 / 2224-2856, Volume 11, 2016, Art. #10