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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
Add:
No.9 Gaoguannong,Daxue Road,Hangzhou,China
P.C:
310009
E-mail:
meem_contribute@163.com
Abstract: Aiming at the problems of fast response but high energy consumption in the crane valve control system, high efficiency but low control accuracy in the pump control system, a multi actuator electro-hydraulic system with variable speed and displacement dual power source pump valve collaboration was established. Firstly, a multi-mode control strategy was proposed, in which one power source was unloaded and the other power source was in operation in a single action micro motion mode. Due to the small swing angle of the hydraulic pump and slow dynamic responded of the system at low flow rates, a dual variable mode control system was adopted at low flow rates. Accurate flow matching was achieved through adaptive adjustment of valve core position and pressure closed-loop control of power source. Secondly,in the single action fast motion mode, the dual power sources merge to drive the single actuator, by controlling the relevant parameters of the electro-hydraulic power source to compensate for pump leakage caused by load changes, the speed of the actuator was controlled in real-time. In the composite fast motion mode, multiple actuators were driven separately by the dual power source shunt. By adjusting the relevant parameters of a single power source, the speed of each actuator was controlled in real-time and the system flow proportional shunt was achieved. Then, a joint simulation model and experimental platform for the system AMESim simulink were established. Finally, simulation and experimental analysis were conducted on the control characteristics of the built system with different set flow rates and under the same set pressure difference.The research results indicate that the system can achieve flow compensation when load changes,and comparing with the constant speed pump valve collaborative pressure flow composite control system, the flow control accuracy is optimized by about 14.76% in single action micro motion mode, and the dynamic response time is reduced by about 0.12 s. In the single action fast motion mode, the flow change decreases by about 6.21%, and the system energy consumption decreases by about 13.94kJ. By utilizing the composite fast motion mode, the system is able to decrease its energy consumption by an approximate amount 50.31kJ. Meanwhile, the system has better traffic stability than traditional anti-flow saturation loads sensitive systems.
Key words: truck crane; variable speed and displacement; pumpvalve cooperative electro-hydraulic system; pressure closedloop control; proportionalintegralderivative(PID) controller; flow control characteristics; pump leakage
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