• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (20): 262-270.doi: 10.3901/JME.2018.20.262

• 控制元件与系统 • 上一篇    下一篇

基于流量前馈与压力反馈复合控制的电液负载敏感系统

程敏1, 于今1, 丁孺琦2, 蔡乐平3   

  1. 1. 重庆大学机械传动国家重点实验室 重庆 400044;
    2. 华东交通大学载运工具与装备教育部重点实验室 南昌 330013;
    3. 上海船舶设备研究所 上海 200031
  • 收稿日期:2017-06-28 修回日期:2018-01-20 出版日期:2018-10-20 发布日期:2018-10-20
  • 通讯作者: 程敏(通信作者),男,1987年出生,博士,副教授。主要研究方向为流体传动与控制。E-mail:chengmin@cqu.edu.cn
  • 作者简介:于今,男,1964年出生,博士,副教授。研究方向为流体传动与控制;丁孺琦,男,1987年出生,博士,讲师。研究方向为流体传动与控制。
  • 基金资助:
    国家自然科学基金(51605050,91748210)、重庆市基础与前沿研究计划(cstc2016jcyjA0253)、中央高校基本科研业务费(106112017CDJXY110002)和江西省自然科学基金(20161BAB206150)资助项目。

Electrohydraulic Load Sensing System via Compound Control of Flow Feedforward and Pressure Feedback

CHENG Min1, YU Jin1, DING Ruqi2, CAI Leping3   

  1. 1. State Key Laboratory of Mechanical Transmissions, Chongqing 400044;
    2. Key Laboratory of Conveyance and Equipment, Ministry of Education, Nanchang 330013;
    3. Shanghai Marine Equipment Research Institute, Shanghai 200031
  • Received:2017-06-28 Revised:2018-01-20 Online:2018-10-20 Published:2018-10-20

摘要: 为提高现有负载敏感系统动态和能耗特性,提出一种基于流量前馈与压力反馈复合控制的电液负载敏感系统。该系统通过负载实时流量需求来前馈控制变量泵斜盘摆角,并结合压力裕度反馈控制对泵排量进行调节,具有响应速度快,稳定裕度高和压力裕度低等特点。以现有压力反馈型和流量前馈型电液负载敏感系统为对比研究对象,建立系统数学模型,并在响应速度、阻尼性能等方面进行对比理论分析,还基于2 t液压挖掘机的试验平台进行对比研究。研究结果表明,相比现有压力反馈型负载敏感系统,所提出的系统具有较高的响应速度和阻尼性能,并且可减小压力裕度目标值以降低系统能耗;此外,所提出的系统通过压力闭环实现供需流量动态匹配,从而避免了由流量过匹配造成的压力冲击和能量损失。

关键词: Rotor37, 刀具干涉, 数值模拟, 叶根倒角, 最小角度, 电液控制, 负载敏感, 工程机械, 流量匹配, 压力反馈

Abstract: To improve the dynamic behaviour and energy efficiency of the existing load sensing technology, an electrohydraulic load sensing (ELS) system is proposed via compound control of flow feedforward and pressure feedback. In this system, the pump displacement is regulated by real-time flow requirement and pressure feedback loop, which is featured by fast response, high stability margin and small pressure margin. The theoretical analysis was carried out to study the response and damping performance in comparison to the existing ELS system via pressure feedback or flow matching, and the corresponding tests on a 2 t hydraulic excavator were also implemented. The results indicate that the proposed system has the advantages of faster response, higher damping performance, and smaller energy consumption through smaller pressure margin. Moreover, dynamic flow matching of the supplement and requirement is fulfilled by pressure feedback, so pressure impacts and energy losses caused by flow excess are avoided in the proposed system.

Key words: electrohydraulic control, flow matching, load sensing, mobile machinery, pressure feedback

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