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Study on the Effect of Structural Parameters on the Linear Control Performance of High Speed On-Off Valve Based on Flow Field Analysis
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on October 05, 2020 by SAE International in United States
High speed on-off valve under the control of high frequency pulse width modulation (PWM) can make control linearly as proportional valve does. It is because its valve opening is adjusted linearly by duty ratio within a certain range. It is significant for high speed on-off valve to achieve precise linear control performance. In practice the performance is influenced not only by control strategy, but also the structural parameters of the valve, such as seat angle, spool diameter of valve and so on. In this paper, it is indicated that the effects of structural parameters on linear control performance of high speed on-off valve is exerted by flow force since different structural parameters bring about different valve opening-flow force characteristics. Accordingly, the relationship between the valve structural parameters and flow force is emphasized. Firstly, the mathematic model of the high speed on-off valve is established, including the flow force mathematic expression being derived in detailed. Secondly, the flow field of high speed on-off valve is simulated via the computational fluid dynamic (CFD) so that the pressure and velocity fields of the valve are acquired, flow force is reported as well. Consequently, it is analyzed that the effects of structural parameters on the valve's linear control performance. The results are verified by the tests are taken at the ESC testing bench, which are references for the development of high-speed on-off valve.