Switching Frequency Improvement of a High Speed on/off Valve Based on Pre-excitation Control Algorithm

Qi Zhong ¹Xiaotian Li ²Yongxin Mao ²Enguang Xu ²Tiwei Jia ²Yanbiao Li ²Huayong Yang³

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作者信息

1. College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China;State Key Laboratory of Fluid Power and Mechatronic Systems,Zhejiang University,Hangzhou 310027,China;Key Laboratory of Special Purpose Equipment and Advanced Processing Technology,Ministry of Education and Zhejiang Province,Zhejiang University of Technology,Hangzhou 310023,China
2. College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Key Laboratory of Special Purpose Equipment and Advanced Processing Technology,Ministry of Education and Zhejiang Province,Zhejiang University of Technology,Hangzhou 310023,China
3. State Key Laboratory of Fluid Power and Mechatronic Systems,Zhejiang University,Hangzhou 310027,China
折叠

Abstract

The high-speed on/off valve(HSV)serves as the fundamental component responsible for generating discrete fluids within digital hydraulic systems.As the switching frequency of the HSV increases,the properties of the generated dis-crete fluid approach those of continuous fluids.Therefore,a higher frequency response characteristic of HSV is the key to ensure the control accuracy of digital hydraulic systems.However,the current research mainly focuses on its dynamic performance,but neglect its FRC.This paper presents a theoretical analysis demonstrating that the FRC of the HSV can be enhanced by minimizing its switching time.The maximum switching frequency(MSF)is mainly determined by opening dynamic performance when HSV operates with low switching duty ratio(SDR),whereas the closing dynamic performance limits the MSF when HSV operates with high SDR.Building upon these findings,the pre-excitation control algorithm(PECA)is proposed to reduce the switching time of the HSV,and consequently enhance its FRC.Experimental results demonstrate that PECA shortens the opening delay time of HSV by 1.12 ms,the closing delay time by 2.54 ms,and the closing moving time by 0.47 ms in comparison to the existing advanced control algorithms.As a result,a larger MSF of 417 Hz and a wider controllable SDR range from 20％to 70％were achieved at a switching frequency of 250 Hz.Thus,the proposed PFCA in this paper has been verified as an effective and promising approach for enhancing the control performance of digital hydraulic systems.

Key words

High speed on/off valve/Switching frequency/Pre-excitation/Dynamic performance/Switching duty ratio

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基金项目

National Natural Science Foundation of China(52005441)

Young Elite Scientist Sponsorship Program by CAST of China(2022-2024QNRC001)

Zhejiang Provincial Natural Science Foundation of China(LQ21E050017)

Zhejiang Provincial"Pioneer"and"Leading Goose"R&D Program of China(2022C01122)

Zhejiang Provincial"Pioneer"and"Leading Goose"R&D Program of China(2022C01132)

State Key Laboratory of Mechanical System and Vibration of China(MSV202316)

Fundamental Research Funds for the Provincial Universities of Zhejiang of China(RF-A2023007)

Research Project of ZJUT of China(GYY-ZH-2023075)

出版年

2024

中国机械工程学报

中国机械工程学会

中国机械工程学报

CSTPCD

影响因子：0.765

ISSN：1000-9345

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