Study on energy regeneration system for hybrid hydraulic excavator

Nowadays, with the development of global energy crisis´s compression and high fuel expenditure, the demands for energy saving and green emission of construction machineries, especially hydraulic excavators, have been rapidly increased. Meanwhile, the power efficiency of the conventional hydraulic excavators is very low. This study deals with the method to regenerate potential energy on the boom system of the hybrid hydraulic excavator. The novel hydraulic circuit as well as the control strategy are introduced to make sure that the performance of the system is satisfied and maximize the energy regeneration capability. The model of the proposed system and the control strategy are built and simulated by AMEsim and Matlab software while the system parameters are taken from a real system. The results show that the proposed energy recovery system and control strategy can improve energy recovery efficiency and optimize working performance of the system.