The influence of valve-pump weight ratios on the dynamic response of leaking valve-pump parallel control hydraulic systems

Ding, Haigang; Zhao, Jiyun; Cheng, Gang; Wright, Steve; Yao, Yufeng

Abstract

© 2018 by the authors. A new leaking valve-pump parallel control (LVPC) oil hydraulic system is proposed to improve the performance of dynamic response of present variable speed pump control (VSPC) system, which is an oil hydraulic control system with saving energy. In the LVPC, a control valve is operating at leaking status, together with a variable speed pump, to regulate the system flow of hydraulic oil simultaneously. Therefore, the degree of valve control and pump control can be adjusted by regulating the valve-pump weight ratio. The LVPC system design, mathematical model development, system parameter and control performance analysis are carried out systematically followed by an experimental for validation process. Results have shown that after introducing the valve control, the total leakage coefficient increases significantly over a wide range with the operating point and this further increases damping ratios and reduces the velocity stiffness. As the valve-pump weight ratio determines the flow distribution between the valve and the pump and the weight factors of the valve and/or the pump controls determines the response speed of the LVPC system, thus if the weight factors are constrained properly, the LVPC system will eventually have a large synthetic open-loop gain and it will respond faster than the VSPC system. The LVPC will enrich the control schemes of oil hydraulic system and has potential value in application requiring of fast response.

• Journal Article Type: Article
• Acceptance Date: Jul 13, 2018
• Online Publication Date: Jul 22, 2018
• Publication Date: Jul 22, 2018
• Deposit Date: Aug 3, 2018
• Publicly Available Date: Aug 3, 2018
• Journal: Applied Sciences (Switzerland)
• Electronic ISSN: 2076-3417
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 8
• Issue: 7
• Article Number: 1201
• DOI: https://doi.org/10.3390/app8071201
• Keywords: rapid response, leaking valve-pump parallel control, variable speed pump control, parallel valve control, valve-pump weight ratio
• Public URL: https://uwe-repository.worktribe.com/output/865247
• Publisher URL: http://dx.doi.org/10.3390/app8071201
• Contract Date: Aug 3, 2018