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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
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No.9 Gaoguannong,Daxue Road,Hangzhou,China
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310009
E-mail:
meem_contribute@163.com
Abstract: Aiming at the serious throttling and overflow loss of the traditional quantitative hydraulic system of the loader, the susceptible load disturbance of the system flow, and the inability of the boom bucket to compound the action, a dual-spool electro-hydraulic load sensing system was proposed on the electric loader and the control strategy in different working modes was designed. The characteristics of the electro-hydraulic load sensing system were studied. Firstly, the working principle of the traditional quantitative hydraulic system of the loader and the electro-hydraulic load sensing system of the double spool were compared. Secondly, the working characteristics and energy consumption characteristics of the dual-spool electro-hydraulic load sensing system were analyzed theoretically, and the control strategies of the individual action and compound action of the boom bucket under the condition of impedance extension and beyond retraction were formulated. Finally, the electromechanical and hydraulic co-simulation model was built by AMESim and LMS Virtual. Lab Motion software, and the operating characteristics and energy-saving characteristics of the dual-spool electro-hydraulic load sensing system on the loader were simulated and analyzed. The results show that the double spool electro-hydraulic load sensitive system can realize the switching of working mode according to different load conditions, and the flow rate of the actuator can be only related to the electro-hydraulic proportional valve opening in separate action and compound action, which is not affected by load changes, and the control performance is greatly improved; in one working cycle, the energy consumption of the double spool electro-hydraulic load sensitive system is reduced by about 71.8% compared with the traditional quantitative hydraulic system. The simulation results show that the proposed system improves the smoothness and efficiency of the loader operation.
Key words: wheel loaders; hydraulic system; independent control of import and export; variable torque control; load-sensitive systems; energy-saving features
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