流体机械2024，Vol.52Issue(9)：16-22,7.DOI:10.3969/j.issn.1005-0329.2024.09.003
基于复合PWM的高速开关阀先导控制电液换向阀特性试验研究
Experimental study on characteristics of electro-hydraulic directional valve with high-speed on-off valve pilot control based on composite PWM
摘要
Abstract
In order to address the problems of imprecise flow control&large pressure impact in traditional hydraulic support directional valves,a high-speed on/off valve-based electro-hydraulic directional valve control hydraulic cylinder scheme was proposed.A test platform was built to study the pilot valve characteristics,and compare the response speed of the electro-hydraulic directional valve when using high-speed&conventional electromagnetic on/off valves as pilot stages.Due to the short lag time of the high-speed on/off valve,the main valve control chamber pressure rises quickly,enabling faster response.Methods of pulse width modulation(PWM)&pulse frequency modulation(PFM)were proposed to control the displacement of the main valve core.Results show that the core's steady-state displacement undergoes four stages,exhibiting a proportional opening effect within a specific duty cycle range.The adjustment of the displacement of the main valve core can be achieved by the high-speed on/off valve throughout the stroke under 10 MPa liquid supply pressure,the control interval of composite PWM signals is 30%～65%duty cycle,whereas the control interval of conventional PWM signal is 35%～50%duty cycle.The composite PWM signals have wider adjustment interval compared with conventional PWM signals,which are more suitable for proportional control of directional valve core displacement.The results can provide reference for the design&development of hydraulic support control valves.关键词
高速开关阀/电液换向阀/脉宽调制信号/位置控制Key words
high speed on/off valve/electrohydraulic directional valve/PWM signal/position control分类
机械制造引用本文复制引用
卢德来,李智源,王伟,廖瑶瑶,张敬阳..基于复合PWM的高速开关阀先导控制电液换向阀特性试验研究[J].流体机械,2024,52(9):16-22,7.基金项目
国家自然科学基金项目(51905368) （51905368）
中国煤炭科工集团科技创新创业基金项目(2023-2-TD-ZD012) （2023-2-TD-ZD012）
山西省基础研究计划项目(202303021211064) （202303021211064）
