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The Scientific World Journal
Volume 2014, Article ID 184909, 14 pages
Research Article

A Novel Energy Recovery System for Parallel Hybrid Hydraulic Excavator

1School of Mechanical Engineering, China University of Mining and Technology, Xuzhou 221116, China
2Shanghai Chuangli Group Co., Ltd., Shanghai 201706, China

Received 11 March 2014; Accepted 4 August 2014; Published 22 October 2014

Academic Editor: Mario L. Ferrari

Copyright © 2014 Wei Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Hydraulic excavator energy saving is important to relieve source shortage and protect environment. This paper mainly discusses the energy saving for the hybrid hydraulic excavator. By analyzing the excess energy of three hydraulic cylinders in the conventional hydraulic excavator, a new boom potential energy recovery system is proposed. The mathematical models of the main components including boom cylinder, hydraulic motor, and hydraulic accumulator are built. The natural frequency of the proposed energy recovery system is calculated based on the mathematical models. Meanwhile, the simulation models of the proposed system and a conventional energy recovery system are built by AMESim software. The results show that the proposed system is more effective than the conventional energy saving system. At last, the main components of the proposed energy recovery system including accumulator and hydraulic motor are analyzed for improving the energy recovery efficiency. The measures to improve the energy recovery efficiency of the proposed system are presented.