Research on the Compensation Technology of Dynamic Characteristic Difference for High Speed on/off Valve

doi:10.3901/JME.2025.24.285

Abstract

Abstract: High speed on/off valve(HSV) is the core control component of digital hydraulic systems, offering advantages such as fast response, strong contamination resistance, and simple design. Dynamic characteristic is the key performance indicator of HSVs, directly determining the response speed and control accuracy of the systems. Therefore, in applications where multiple HSVs are used synchronously or cooperatively, ensuring consistency in dynamic characteristic of each HSV is particularly crucial. However, even with the improvement in machining precision, the use of high-performance materials, and the optimization of assembly process, discrepancies in dynamic characteristic within the same batch of HSVs still cannot be completely eliminated. To address this issue, the traditional approach of improving consistency through enhanced manufacturing precision is bypassed. Instead, it proposes an innovative method to compensate for differences in dynamic characteristic via optimizing control algorithm. Firstly, a dynamic characteristic mathematical model of HSV is developed. Based on this model, the effects of initial coil current and electromagnetic force on the dynamic characteristic are analyzed. Then, a multi-voltage compound driving algorithm is proposed to compensate for differences in dynamic characteristic of HSVs. The algorithm adjusts the driving voltage at each stage of the HSV's movement in a targeted manner, thereby modifying the switching delay time and moving time. By doing so, the differences in the dynamic characteristic among the HSVs are effectively eliminated. Finally, a dynamic characteristic difference compensation experiment is conducted on three HSVs of the same batch. The effectiveness of the compensation algorithm is validated by testing the variation of dynamic characteristic and pressure-flow characteristic. The results show that, after compensation, the maximum difference in switching delay time and moving time among the three HSVs is reduced from 1.94 ms to 0.01 ms. Additionally, the maximum difference rate in switching delay time and moving time is decreased from 29.79% to 1.67%. The maximum difference rate in pressure-flow characteristic is dropped from 9.73% to 3.03%.

Key words: high speed on/off valve, dynamic performance, flow characteristic, consistency, compensation

CLC Number:

TG156

ZHONG Qi, HUANG Yi, CHEN Zhaohang, XU Enguang, WANG Junxian, HE Xianjian, WANG Jun, LI Yanbiao, YANG Huayong. Research on the Compensation Technology of Dynamic Characteristic Difference for High Speed on/off Valve[J]. Journal of Mechanical Engineering, 2025, 61(24): 285-294.

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