电控直线电机变排量负载敏感系统仿真分析  

Simulation Analysis of Variable Displacement with Electric Control Linear Motor in Load Sensitive System

作　　者：王伟 罗瑜[1] 罗艳蕾[1] 杜黎 陈旺 WANG Wei;LUO Yu;LUO Yan-lei;DU Li;CHEN Wang(College of Mechanical Engineering, Guizhou University, Guiyang, Guizhou 550025)

机构地区：[1]贵州大学机械工程学院,贵州贵阳550025

出　　处：《液压与气动》2021年第7期49-57,共9页Chinese Hydraulics & Pneumatics

基　　金：国家自然科学基金(51965011);贵州省教育厅创新群体重大研究项目(黔教合KY字[2017]029);贵州省科技计划项目(黔科合平台人才[2018]5781-23)。

摘　　要：传统负载敏感系统是通过机-液反馈控制,具有鲁棒性差、易振荡、难以实现精确的排量调节等缺点。据此,提出了电控直线电机变排量负载敏感系统,利用直线电机代替变量缸来调节轴向柱塞泵排量,并利用流量前馈结合压差反馈的方式对直线电机进行控制,实现液压系统的负载敏感功能。利用AMESim-MATLAB联合仿真对电控直线电机变排量负载敏感系统进行仿真研究,并与传统机-液负载敏感系统在响应速度以及鲁棒性方面进行对比。结果表明,电控直线电机变排量负载敏感系统在单泵多执行变负载工况下,可以实现传统负载敏感系统功能;该系统相对于传统负载敏感系统具有更优异的鲁棒性以及响应速度,能够克服传统负载敏感系统响应慢、易振荡等缺点。对电控直线电机变排量负载敏感系统变压差控制进行了进一步的分析,结果表明,该系统可以通过调整控制系统中压力裕度的值实现变压差控制,大大增加了负载敏感系统的负载适应范围,可以根据不同工况调整压差大小。The traditional load sensing system is controlled by mechanical-hydraulic feedback,which has the disadvantages of poor robustness,oscillation and inaccurate displacement regulation.Aiming at these shortcomings,the load sensing system with electric linear motor is proposed.The displacement of axial piston pump is adjusted by linear motor instead of variable cylinder,and the linear motor is controlled by flow feedforward combined with differential pressure feedback to realize load sensing function.The co-simulation of AMESim-MATLAB is used to simulate the load sensing system with electric linear motor.The results show that the variable displacement load sensing system can realize the function of traditional load sensing system under the condition of single pump with multiple variable loads.Compared with the traditional load sensing system,the variable displacement load sensing system has better robustness and response speed,which overcomes the shortcomings of the traditional load sensing system,such as slow response and easy oscillation.The variable pressure differential control with electric linear motor is studied further.Comparing with the traditional load sensing system,the load sensing system with electric linear motor can realize the variable pressure difference control by adjusting the value of pressure margin in control system.This convenient regulatory scheme extends the load adaptability of the load sensing system,and can adjust the differential pressure according to different operated conditions flexibly.

关 键 词：负载敏感 直线电机 前馈控制 变压差 

分 类 号：TH137[机械工程—机械制造及自动化]