关键词: 油液混合, 液压挖掘机, 差动流量分配, 能量回收利用

Abstract: Traditional hydraulic excavators have energy loss during operating process.Aiming at this problem，a recovery system for boom potential energy of hydraulic hybrid excavator was proposed to improve fuel economy as well as environmental performance of excavators. The main design parameters of boom potential energy recovery were analyzed, and the virtual prototype and the mathematic models of hydraulic components were established. Based on the approach that flow distribution was derived from the outlet differential pressure between main power sources and auxiliary, an applicable control strategy of hydraulic excavator's potential energy recycling was designed. The simulation results indicated that the energy utilization ratio of proposed excavator was improved obviously, while the operating performance was unaffected. Therefore the effectiveness of designed system scheme and control strategy was verified.

Key words: hydraulic hybrid, hydraulic excavator, differential flow distribution, energy recycling