1. H.X. Yao, Theory and Performance of Construction Machinery Engine, Beijing: China Communications Press, (2004).
2. B. Zhao, J. Liu, L. Dai and Z.L. Deng, Energy Saving Analysis of the Hydraulic System in Excavator, Fluid Power Transmission & Control, pp.43-45, April (2007).
3. Z.Y. Huang and X.H. Li, Energy saving measures for hydraulic excavators, Construction Mechanization, pp.50-53, August (2004).
4. F. Gao, P.E. Feng, S.X. Pan and Y. Gao, Summary of energy saving control of hydraulic excavator, Construction Machinery & Maintenance, pp.40-43, December (2001).
5. W.J. Wu and G.R. Liu, Study on Control Methods in Hydraulic Technology, Hydraulics Pneumatics & Seals, pp.19-23, June (2007).