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Hydraulic Accumulator-Motor-Generator Energy Regeneration System for a Hybrid Hydraulic Excavator

查看全文 作　　者：LIN [1,2]Tianliang;WANG [1]Qingfeng 高影响力作者 机构地区：[1]State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;[2]College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China高影响力机构 出　　处：《Chinese Journal of Mechanical Engineering》索引2012年第25卷第6期,共9页高影响力期刊 基　　金：supported by National Natural Science Foundation of China(Grant No. 50875233);National Hi-tech Research and Development Program of China(863 Program, Grant No. 2010AA044401);Open Fund of the State Key Lab of Flow Power Transmission and Control(Grant No. GZKF-201111);National Youth Science Foundofion of China(Grant No. 51205140);Fundamental Research Funds for the Central University of China(Grant No. JB-ZR1208);Scientific Research Funds of Huaqiao University, China(Grant No. 11BS409) 摘　　要：Though the traditional energy regeneration system(ERS) which used a hydraulic motor and a generator in hybrid excavators can regenerate part of the energy, the power of the motor and the generator should be larger and the time for regenerating energy is so short. At first, the structure of new ERS that combines the advantages of an electric and hydraulic accumulator is analyzed. The energy can be converted into both the electric energy and the hydraulic energy at the lowering of the boom and the generator can still works when the boom stops going down. Then, a method how to set the working pressure of the hydraulic accumulator is proposed. To avoid the excess loss, extra noise and shock pressure, a two-level pressure threshold method that the generator starts to work at the rising edge of the high pressure threshold and stops working at the falling edge of the low pressure threshold is presented to characterize the working mode of the generator. The control strategies on how to control the boom velocity at the lowering of the boom and how to improve the recovery efficiency when the boom stops going down are presented. The test bench of hybrid excavator with ERS is constructed, with which the studies on the influences of ERS on energy conversion efficiency and control performance are carried out. Experimental results show that the proposed ERS features better speed control performance of the boom than traditional ERS. It is also observed that an estimated 45% of the total potential energy could be regenerated at the lowering of the boom in the proposed ERS, and the power level of the generator and the hydraulic motor could be reduced by 60%. Hence, the proposed ERS has obvious advantages over the traditional ERS on the improvement of energy regeneration time, energy efficiency, control performance and economy. 关 键 词：能量回收系统 液压蓄能器 液压挖掘机 混合动力 发电机 电动机 再生系统 工作压力
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