Transactions of Materials and Heat Treatment

Title：Simulation analysis on control scheme and loop characteristics for asymmetric pump-controlled hydraulic system

Authors： Wang Haiyan Yuan Hewei Li Feng Zhang Qiang

Unit： Hebei Zhuozhou Technician College Henan Vocational and Technical College of Communications Hebei University of Science and Technology Henan Ruizhi Hydraulic Equipment Co. Ltd.

KeyWords： pump-controlled hydraulic system loop characteristics hydraulic cylinder flow variable displacement variable rotation speed

ClassificationCode：TH137

year,vol(issue):pagenumber：2022,47(2):162-166

Abstract：

In order to solve the problem of hydraulic cylinder flow mismatch in closed pump control system and improve the energy efficiency of hydraulic system, a control method of asymmetric pump-controlled hydraulic system with variable displacement and variable rotation speed was designed. Then, through the comprehensive control of two degrees of freedom, the displacement was adjusted, and the control function of telescopic position and movement speed of the hydraulic cylinder was realized. Meanwhile, the control speed and control displacement were overlapped to obtain a faster system response speed. Furthermore, the control scheme and loop characteristics of the asymmetric pump-controlled hydraulic system were simulated and analyzed respectively from the aspects of speed open-loop and closed-loop control schemes and load characteristics. The results show that an asymmetrical speed was formed in the speed open-loop control system, while the speed closed-loop control system exhibits a more stable state to achieve higher position control accuracy and a stable operation state which could obtain better position control performance. The closed-loop speed could keep stable state and is basically not affected by the load.

Funds：

河南省高等学校青年骨干教师培养计划项目（2017-GGJS242）

作者简介：王海燕（1974-），女，学士，高级讲师,E-mail：yuanhewei2021@163.com

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