变转速泵控系统建压过程中流量死区特性分析

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (1): 54-60.

变转速泵控系统建压过程中流量死区特性分析

强彦^1,2, 王亚强¹, 赵春丽¹, 李维¹, 罗小梅³, 魏列江¹

1.兰州理工大学能源与动力工程学院, 甘肃兰州 730050;
2.兰州理工大学甘肃省液压气动工程技术研究中心, 甘肃兰州 730050;
3.中国北方车辆研究所北京 100072

收稿日期:2019-03-12 出版日期:2021-02-28 发布日期:2021-03-11
作者简介:强彦(1982-),女,甘肃白银人,硕士,讲师.
基金资助:
国家自然科学基金(51765033)

Characteristic analysis of flow-dead-zone in pressure building of variable speed pump control system

QIANG Yan^1,2, WANG Ya-qiang¹, ZHAO Chun-li¹, LI Wei¹, LUO Xiao-mei³, WEI Lie-jiang¹

1. College of Energy and Power Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. Hydraulic and Pneumatic Engineering Technology Research Center of Gansu Province, Lanzhou Univ. of Tech., Lanzhou 730050, China;
3. China North Vehicle Research Institute, Beijing 100072, China

Received:2019-03-12 Online:2021-02-28 Published:2021-03-11

摘要/Abstract

摘要： 为揭示泵控系统中液压泵在控制过程中出现流量死区的机理,针对泵控系统在启动和换向过程中必需重新建压的特点,考虑压差流与剪切流导致的液压泵内泄漏以及油液可压缩性,建立包含流量死区的液压泵数学模型.通过分析得到:液压泵流量死区的宽度随液压泵的出口容腔、负载压力、油温和启动加速度的增大而增大,随液压泵排量的增大而减小.为此,以齿轮泵为例建立Simulink-Amesim联合仿真模型,进一步研究不同负载压力、油温和启动加速度对流量死区宽度的影响,并验证理论分析结果.结果表明:液压泵流量死区宽度与负载压力和启动加速度均呈线性关系,与油温接近指数关系.

关键词: 泵控系统, 流量死区, 泄漏, 齿轮泵, Simulink-Amesim

Abstract: In order to reveal dominant mechanism of the flow-dead-zone of a hydraulic pump in pump control system, a mathematical model of the hydraulic pump, including the flow-dead-zone, is established in this paper. The model takes into account the leakage in the hydraulic pump caused by differential pressure flow and shear flow as well as the compressibility of oil. Through analyses of the mathematical model, it is concluded that the width of the flow-dead-zone of the hydraulic pump increases with increase of the outlet cavity, load pressure, oil temperature and start-up acceleration of the hydraulic pump, and decreases with increase of displacement of the hydraulic pump. For this reason, taking a gear pump as an example, a Simulink-Amesim joint simulation model is established to study further effects of different load pressure, oil temperature and start-up acceleration on the dead zone width, and verify the results from theoretical analyses. The results show that the dead zone width of hydraulic pump flow has a linear relationship with load pressure and start-up acceleration, and is close to an exponential relationship with oil temperature.

Key words: pump control system, flow-dead-zone, leakage, gear pump, Simulink-Amesim

中图分类号:

TH137.51

强彦, 王亚强, 赵春丽, 李维, 罗小梅, 魏列江. 变转速泵控系统建压过程中流量死区特性分析[J]. 兰州理工大学学报, 2021, 47(1): 54-60.

QIANG Yan, WANG Ya-qiang, ZHAO Chun-li, LI Wei, LUO Xiao-mei, WEI Lie-jiang. Characteristic analysis of flow-dead-zone in pressure building of variable speed pump control system[J]. Journal of Lanzhou University of Technology, 2021, 47(1): 54-60.

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