中文摘要：

鉴于混合动力系统或电动驱动系统中具有电量储存单元的特点,提出了一种基于电动机-闭式泵-液压蓄能器的液压挖掘机动臂节能驱动系统,通过液压蓄能器和高压侧相连,提高了液压蓄能器的工作压力范围和驱动系统的效率,分析了节能驱动系统的结构原理及工作特点。以减小蓄能器安装体积、保证动臂非对称油缸的流量匹配和延长蓄能器使用寿命为约束条件,以某20 t液压挖掘机的测试数据对节能驱动系统中液压蓄能器、大排量闭式泵、电动/发电机、小排量闭式泵等主要元件进行了参数匹配。针对所匹配参数建立节能驱动系统的AMESim数学模型进行分析,结果表明,该系统不仅实现了无阀控制和负负载的能量回收,同时蓄能器额定体积降低了50%,仍然可满足动臂非对称油缸两腔的流量差,且蓄能器压力波动满足工况的要求,相对传统动臂节流驱动系统,新型闭式节能驱动系统的节能效果达到了50%左右。

英文摘要：

In view of the characteristic of power storage unit and hydraulic accumulator in the hybrid power system or electric power system,a hydraulic energy-saving driving system based on electric motor-hydraulic closed pumphydraulic accumulator is developed to improve the efficiency of driving system.The pressure range of the hydraulic accumulator and the efficiency of the drive system are improved through linking with the raw chamber and the working principle and characteristics of the proposed system are analyzed.Then,the low energy density of the accumulator,and working cycle,the parameter matching for the proposed energy-saving system are discussed.The matching results are analyzed by the software AMESim.The results show that the energy-saving can be at around 50%,because there is no throttling loss and the potential energy of the boom can be regenerated.It is also observed that the pressure of the hydraulic accumulator can be restrained at its working pressure and that the fuel consumption rate can be reduced by 50%.