In this paper,the principle of hybrid hydraulic excavator system is expounded and analysis from the aspects of the components of hybrid energy sources, the system structure and the way of energy recovery and release. Base on the way of energy release, the hydraulic hybrid excavator system is divided into torque-coupling type and flow-coupling type,analyzing their principle and control method to summarize the energy saving principle and technical difficulties. The flow-coupling type is also divided into oil supply type and oil confluence type base on the position of the confluence. The principle and characteristics of hydraulic hybrid excavator system base on accumulator-hydraulic cylinder is also discussed aiming to solve the problem of flow-coupling. According to the above,the development directions of hydraulic hybrid excavators are proposed ' such as developing more high performance and cost-effective new components to suit the operating conditions of excavators, optimize the energy management strategy and further research on energy recovery objects.%该文从混合动力能量源的组成、系统结构型式、能量回收与释放方式等方面阐述了液压挖掘机混合动力系统原理,并对比分析其各自的特点.将油液混合动力液压挖掘机系统以能量释放方式分为扭矩耦合式、流量耦合式的油液混合动力系统,分析其系统原理及控制方法,总结其节能原理及技术难点.在流量耦合式油液混合动力系统分析中,以合流位置的不同,将其分为泵前供油与泵后合流的流量耦合,并针对不同能量源产生的流量耦合问题,阐明基于蓄能器-液压缸型式的油液混合动力系统原理及特性.油液混合动力液压挖掘机的发展方向包括开发适应挖掘机作业工况的高性能且高性价比的新元件、优化能量管理策略及对能量回收对象的进一步研究.
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