中文摘要：

为了使液压挖掘机达到节能的目的,考虑到混合动力挖掘机具有电量储存单元的特点,针对传统挖掘机转台加速和制动过程中的溢流损耗,提出了一种基于液压马达-发电机的溢流损耗能量回收的转台节能驱动系统。分析了一种基于先导操作手柄压力和回转马达进出口压力的转台工作模式辨别准则。考虑到大惯性负载引起的反转问题和转台冲击,提出了一种基于转台转速的回收马达进口压力动态调整方法以及防反转控制方法。最后建立了多种驱动系统的数学模型,并进行了节能效果和操控性能的仿真研究。结果表明：该系统不仅可以实现转台制动动能的回收,而且可回收转台加速过程中的溢流损耗,同时在防反转控制和防止转台加速度冲击方面均具有良好的控制效果;相对于原驱动系统,新型驱动系统节能约38%。

英文摘要：

In order to reduce energy consumption of hydraulic excavators, a novel driving system that used a hydraulic motor-generator to recover both the orifice loss of the relief valve at the accelerating stage and the kinetic energy at the braking stage of the swing was presented. Then, the new working mode of the swing was characterized by the pilot pressure of the control stick and the pressure of the hydraulic motor. Considering control performance and the recovery efficiency, the control strategies on how to avoid anti-reverse of the swing and how to reduce the pressure shock to the swing were presented. Finally, the different control systems were modeled. Simulations were performed to evaluate the effectiveness of the control system. The results indicate that the proposed system can not only recover the kinetic energy at braking of the swing but also recover the orifice loss of the relief valve at accelerating, it can be effective to avoid anti-reverse and reduce the impact at accelerating and the energy-saving can be about 38%.