Transactions of Materials and Heat Treatment

Title：Dead zone compensation strategy and simulation of control characteristics for electro-hydraulic servo valve with differential pressure feedback

Authors： Liang Qiang Liu Fang Liu Hongliang Hu Dongfang Li Qing

Unit： Xinxiang Vocational and Technical College Henan University of Science and Technology Zhengzhou Machinery Design and Research Institute Co. Ltd.

KeyWords： electro-hydraulic servo valve compensation of dead zone pressure feedback control chracteristics proportional gain

ClassificationCode：TH137

year,vol(issue):pagenumber：2022,47(2):158-161

Abstract：

Aiming at the non-linear flow problem caused by dead zone of electro-hydraulic servo valve without spool displacement, based on the analysis of the dead zone model of electro-hydraulic servo valve, a compensation model for the dead zone of electro-hydraulic servo valve with differential pressure feedback was designed to achieve the compensation function of dead zone without displacement feedback. Then, the simulation compensation voltage signal was added to the control system of electro-hydraulic servo valve, and the flow rate of proportional flow valve was rapidly compensated by setting the “voltage-flow” slope of the proportional flow valve in different changing stages. According to the difference of the dead zone for electro-hydraulic servo valve under different inlet and outlet differential pressure, the compensation analysis for the dead zone of electro-hydraulic servo valve was carried out. The simulation results show that under the static control characteristics, when the inlet and outlet differential pressure rises from 2 MPa to 6 MPa, the spool displacement decreases by nearly 0.1 mm (maximum), and the flow dead zone shrinks by about 2%. However, under the dynamic control characteristics, the proposed compensation method reduces the dead zone of electro-hydraulic servo valve to 3%, and the compensation method is completely feasible.

Funds：

河南基础科研基金资助项目（51571084）

作者简介：梁强（1985-），男，学士，讲师,E-mail：xzy13784933322@163.com

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