具有压差反馈的电液伺服阀死区补偿策略及控制特性仿真  

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

作　　者：梁强[1] 刘芳[1] 刘红亮[1] 胡东方 李庆 Liang Qiang;Liu Fang;Liu Hongliang;Hu Dongfang;Li Qing(Department of Automobile Engineering,Xinxiang Vocational and Technical College,Xinxiang 453000,China;School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471000,China;Zhengzhou Machinery Design and Research Institute Co.,Ltd.,Zhengzhou 450000,China)

机构地区：[1]新乡职业技术学院汽车技术系,河南新乡453000 [2]河南科技大学材料科学与工程学院,河南洛阳471000 [3]郑州机械设计研究院有限公司,河南郑州450000

出　　处：《锻压技术》2022年第2期158-161,166,共5页Forging & Stamping Technology

基　　金：河南基础科研基金资助项目(51571084)。

摘　　要：针对无阀芯位移电液伺服阀死区引起的流量非线性问题,在分析电液伺服阀死区模型的基础上,设计得到了一种具有压差反馈的电液伺服阀死区补偿模型,实现了无需通过位移反馈便能达到对死区的补偿作用。模拟补偿电压信号增加到电液伺服阀的控制系统中,并通过设置比例流量阀在不同变化阶段的"电压-流量"斜率来达到快速补偿比例流量阀流量的作用。针对不同进、出口压差条件下的电液伺服阀死区差异,对电液伺服阀死区进行补偿分析。仿真结果表明:静态控制特性下,当进、出口压差从2 MPa升至6 MPa时,阀芯位移降低近0.1 mm(最大值),流量死区缩小约2%;动态控制特性下,所提出的补偿方法可以将电液伺服阀死区减小到3%,补偿方法是完全可行的。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.

关 键 词：电液伺服阀 死区补偿 压力反馈 控制特性 比例增益 

分 类 号：TH137[机械工程—机械制造及自动化]