4Shapkness E,Heyne D,Lech R J.Hydraulic swing damping system[Pl.United states patent, US6886278,Dec 18,2003.
5Macleod, Ian J.C.Closed circuit swing control system [P].United states patent,US6520731,Febmary 18,2003.
6Hiroaki I.Introduction of PC200-8 hybrid hydraulic excavators [M ].Tokyo:KOMATSU TECHNIC,2007.
7Saad A K,Yasser H A.Modeling and simulation of hydro mechanically constant power controlled swash plate pumps [J].Fluid Power Systems and Technology,2006 (10):22-37.
8Hiroaki Inoue.Introduction of PC200-8 Hybrid Hydraulic Excavators [M].Tokyo:KOMATSU TECHNIC, 2007.
9Roger Clayton Fales,Francis J.Raab.Hydraulic control system with energy recovery [P].US 6854268B2.2005.2.15.