Development of a novel two-stage proportional valve with a pilot digital flow distribution

doi:10.1007/s11465-020-0622-2

Frontiers of Mechanical Engineering

2021, Vol. 16

Issue (2): 420-434 https://doi.org/10.1007/s11465-020-0622-2

本期目录

Development of a novel two-stage proportional valve with a pilot digital flow distribution

Qiang GAO, Yuchuan ZHU(

), Changwen WU, Yulei JIANG

National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

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Abstract：

Pilot two-stage proportional valves are widely used in high-power hydraulic systems. For the purpose of improving the dynamic performance, reliability, and digitization of the traditional proportional valve, a novel two-stage proportional valve with a pilot digital flow distribution is proposed from the viewpoint of the dual nozzle-flapper valve’s working principle. In particular, the dual nozzle-flapper is decoupled by two high-speed on/off valves (HSVs). First, the working principle and mathematical model of the proposed valve are determined. Then, the influences of the control parameters (duty cycle and switching frequency) and structural parameters (fixed orifice’s diameter and main valve’s spring) on the main valve’s motion are analyzed on the basis of theory, simulation, and experiment. In addition, in optimizing the value of the fixed orifice’s diameter, a new design criterion that considers the maximum pressure sensitivity, flow controllability, and flow linearization is proposed to improve the balance between the effective displacement and the displacement fluctuation of the main valve. The new scheme is verified by simulations and experiments. Experimental results of the closed-loop displacement tracking have demonstrated that the delay time of the main valve is always within 3.5 ms under different working conditions, and the tracking error can be significantly reduced using the higher switching frequency. The amplitude–frequency experiments indicate that a −3 dB-frequency of the proposed valve can reach 9.5 Hz in the case of ±50% full scale and 15 Hz in the case of 0%–50% full scale. The values can be further improved by increasing the flow rate of the pilot HSV.

Key words： two-stage proportional valve digital flow distribution high-speed on/off valve position tracking characteristic dynamic performance

收稿日期: 2020-09-11 出版日期: 2021-06-15

Corresponding Author(s): Yuchuan ZHU

引用本文:

. [J]. Frontiers of Mechanical Engineering, 2021, 16(2): 420-434.
Qiang GAO, Yuchuan ZHU, Changwen WU, Yulei JIANG. Development of a novel two-stage proportional valve with a pilot digital flow distribution. Front. Mech. Eng., 2021, 16(2): 420-434.

链接本文:

https://academic.hep.com.cn/fme/CN/10.1007/s11465-020-0622-2
https://academic.hep.com.cn/fme/CN/Y2021/V16/I2/420

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