Energy saving control of electro-hydraulic position servo based on pump valve coordinated control

LIU Hua1, WANG Cheng-wen1,2, ZHAO Bin1,2
(1.College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2.The State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310058, China)

Abstract: Aiming at low energy efficiency of the valvecontrolled position servo system, an energysaving system was proposed to coordinate control the pump speed and independent metering. Different control strategies were designed for impedance and overrun conditions. Firstly, according to the principle of the system, the mathematical model of the position servo system with pump valve coordinated control was established. The coupling problem of this system was analyzed. Then, the feedforward feedback controller was designed in the pressure loop to improve the control effect. Finally, AMESim and MATLAB were used to establish cosimulation model for simulation analysis. The results indicate that the energy efficiency of the proposed energysaving control strategy is higher than that of load sensing control strategy. The feedforward feedback controller effectively reduces the pressure fluctuation caused by coupling, and improves the pressure control accuracy.
Key words: separate meter in and meter out; electro-hydraulic load sensing; pump and value coordinated control; feedforward and feedback control