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浙江大学学报(工学版)
浙江大学学报(工学版)
机械与能源工程     
带旁路压力补偿的电液流量匹配系统
徐兵1,程敏1,2,杨华勇1,张军辉1
1. 浙江大学 流体动力与机电系统国家重点实验室,浙江 杭州 310027;2. 重庆大学 机械工程学院,重庆 400044
Electrohydraulic flow matching system with bypass pressure compensation
XU Bing1, CHENG Min1, 2, YANG Hua yong1, ZHANG Jun hui1
1. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;
2. College of Mechanical Engineering, Chongqing University, Chongqing 400044, China
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摘要：

针对负载敏感系统效率低、响应慢的问题,提出一种带旁路压力补偿的电液流量匹配系统.该系统根据负载流量需求直接控制泵的排量,引入旁路压力补偿回路以解决由过流匹配带来的压力冲击和能量损失.建立该系统与机液负载敏感系统的数学模型,并对两者的动态特性进行对比分析.建立基于2 t液压挖掘机的实验样机,进行典型工况下动臂提升动作以及动臂/铲斗复合动作实验研究.理论与实验结果表明：所提出的系统通过采用旁路压力补偿和流量匹配方法,提高了压力可控性和阻尼性能,系统压力裕度和响应时间相比机液负载敏感系统分别降低了06～07 MPa 和 05 s,同时负载速度振荡减小,提高了所提出系统的效率和操控性能.
Abstract:

An electrohydraulic flow matching system with bypass pressure compensation was proposed aiming at the low efficiency and slow response of the load sensing systems. In the system, the pump displacement was directly controlled based on load flow requirements. The bypass pressure compensation circuit was introduced to solve the problems of pressure impact and energy loss caused by flow excess. The mathematical models of  load sensing system and the proposed system were established, and their dynamic behaviors were analyzed and compared. An experimental prototype was developed based on a 2 ton hydraulic excavator. The experimental tests were conducted under the typical working conditions of boom lifting motion and boom/bucket compound motion. The theoretical and experimental results indicated that the pressure controllability and damping performance were improved in the proposed system by using the bypass pressure compensation and the flow matching method. The pressure margin and the response time were reduced by 06～07 MPa and 05 s, respectively, in contrast to those of the load sensing system. Meanwhile, the oscillation of load velocity was reduced. Therefore, the  efficiency and  controllability of the proposed system were improved.
出版日期: 2015-10-15
:  TH 137.5  
基金资助:

国家自然科学基金资助项目(51375431);国家科技支撑计划资助项目(2013BAF07B01).
作者简介: 徐兵(1971-)，男，教授，博导，从事流体传动与控制方面的研究.ORCID:0000 0003 0236 7896.E-mail：bxu@zju.edu.cn
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引用本文:

徐兵,程敏,杨华勇,张军辉. 带旁路压力补偿的电液流量匹配系统[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008 973X.2015.09.020.

XU Bing, CHENG Min, YANG Hua yong, ZHANG Jun hui. Electrohydraulic flow matching system with bypass pressure compensation. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008 973X.2015.09.020.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008 973X.2015.09.020    或    http://www.zjujournals.com/eng/CN/Y2015/V49/I9/1762

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