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pressure Control of a Large-scale Hydraulic Power Unit Using π Bridge Network

Chinese Journal of Mechanical Engineering 2011年第3期24卷 386-391页

作者： FENG Bin GONG Guofang YANG Huayong The State Key Lab of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

The steady state and dynamic characteristics of pressure output of a hydraulic power unit are important to the hydraulic system *** of the compact structure,the B-half bridge resistance network is widely used in the pilot controlled pressure relief *** the steady-state pressure error might be unacceptably big in those pressure control systems.A constant pressure power unit is typically assumed in analysis of steady state and dynamic behavior of hydraulic *** flow-pressure relationship seems to be much complex,in particular when big flow variation takes *** this paper,the π bridge hydraulic resistance network pilot stage is designed in order to get better flow-pressure *** on the similarity of electrical circuits,the main factors influencing flow-pressure characteristics are ***,the optimum diameters of both constant hydraulic resistor and dynamic resistor are ***-pressure characteristics are compared with different constant hydraulic resistors,dynamic resistor and spring stiffness by simulations and *** of simulations and experiments show that flow-pressure characteristics depend very little on the spring stiffness in whole flow *** controlled pressure characteristics can be achieved with suitable constant *** can be reduced with the small diameter of the dynamic ***-pressure characteristics of pressure relief valve can be improved with a π bridge pilot *** proposed pressure control method will provide some positive guidelines and be helpful to design a high performance hydraulic system with large flow.

关键词： two stage pressure relief valve π bridge resistor network flow-pressure characteristics

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