%0 Journal Article %T Research on variable pressure characteristics of step variable hydraulic hybrid system based on cartridge value group %A Li, Chunshuang %A Wang, Xin %A Wang, Jiayi %A Wang, Li %A Liu, Xinhui %J The Journal of Engineering %V 2019 %N 13 %P 415-420 %D 2019-01-01 %I Wiley Subscription Services, Inc., A Wiley Company %~ DeepDyve