Characteristics study of electro-hydraulic load-sensing control system for mobile machines

Jiaming Wu, Feng Wang, Bing Xu, Zongxuan Sun

Research output: Contribution to journalArticlepeer-review

Abstract

The hydro-mechanical load-sensing control is an efficient system solution to working function of mobile machines since the system pressure always adapts to the highest load pressure. The main issue of this system is its instability problem caused by hydro-mechanical feedback control. Moreover the pressure margin between system and load pressure set by the load-sensing compensator is usually fixed and has less control flexibility. Therefore, an electro-hydraulic load-sensing control system occurs, where the load pressure is sensed by pressure transducer and load-sensing control is achieved electronically. It eliminates the hydro-mechanical feedback control loop and has more control flexibility. The previous studies mainly focus on the system function, controller design and system efficiency. However the quantitative analysis of system characteristics has not yet been studied. Therefore, in this paper a method is provided to investigate the influences of pump displacement dynamics and preset pressure margin on system control performance. A hydraulic load-sensing control test rig is developed. Results show a good agreement between simulation and test results. The pressure margin fluctuation is reduced by using a pump with faster displacement dynamics and a larger cut-off frequency of load velocity control is obtained with a larger preset pressure margin however this results in lower system efficiency.

Bibliographical note

Funding Information:
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported in part by the National Natural Science Foundation of China under Grant 51875509, in part by the Zhejiang Provincial Natural Science Foundation under Grant LR22E050003, and in part by the NSFC-Shanxi Joint Fund under Grant U1910212.

Publisher Copyright:
© IMechE 2022.

Keywords

  • Electro-hydraulic load-sensing control
  • mobile machines
  • motion control
  • pump displacement control
  • system characteristics

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