中文摘要：

根据液压混合挖掘机动力系统的驱动结构、工作原理和负载特性，提出了其参数匹配方法．以蓄能器安装空间最小、蓄能器使用寿命最长和发动机工作点的稳定性为约束条件，从最大限度地发挥辅助驱动单元削峰填谷功能和降低系统装机功率的角度，对液压蓄能器的工作压力和体积、发动机功率、泵／马达的排量等参数的设计依据及其匹配进行分析，利用AMEsim软件建立仿真模型，以用于节能驱动系统中蓄能器的工作压力和额定体积的仿真．结果表明，进行参数匹配后，发动机的工作点切换满足稳定性的要求，且蓄能器的压力波动满足工况的要求．相对于原始驱动系统，其节能效果显著，节能比率为11．21％．

英文摘要：

Based on the driving structure, working principle and working condition of a parallel hydraulic hybrid system in an excavator, the parameter design and matching were studied. Considering the installa- tion, service life and the stableness of the engine, a method how to set the working pressure of the hydrau- lic accumulator was proposed. Then, to show the hybrid system＇s greatest advantage at its working area and reduce the power of the enegine and the pump/motor, the parameter design of engine power and pump/motor displacement were studied. The matching results were analyzed using the built hydraulic hy- brid excavator model based on AMEsim software. The results show that it can improve the distribution of engine＇s working points and restrain the pressure of the hydraulic accumulator without sacrificing the sta- bility of the engine. The energy saving of the hybrid system is at around 11.21%. The working pressure and rated volume of accumulator in different energy-saving system are brought forward.