液压混合动力挖掘机的能量回收效率分析

为提高挖掘机的燃油经济性并降低排放,采用基于压力共轨(CPR)的配置方式构造液压混合动力挖掘机,并针对回转系统耗能大且能量回收潜力大的特点,利用Simula-tion X对回转系统建立仿真模型,分析了影响能量回收效率的主要因素.结果表明,所提出的挖掘机回转系统在制动时不仅可以有效地完成能量的回收,而且能量回收效率随液压蓄能器容积和回转系统制动前速度的增大而增加.文中还通过模拟实验对仿真得出的结论进行了验证,发现实验结果与仿真结果相吻合.

Analysis of Energy Recovery Efficiency of Hydraulic Hybrid Excavator

In order to improve the fuel economy and reduce the emission of hydraulic excavators,a hydraulic hybrid excavator with the configuration based on the Common Pressure Rail is constructed.Then,by taking into consideration the high energy consumption and great energy recovery potential of the swing system,a simulation model of the swing system is established with Simulation X,and the main factors affecting the energy recovery efficiency(ERE) are analyzed.The results show that the proposed swing system effectively recovers the energy in breaking,and that the ERE increases with the hydraulic accumulator volume and the initial braking speed.In addition,some experiments are carried out to verify the conclusions drawn by simulation,finding that there exists a good accordance between the simulated and the experimental results.