2Flueckiger L, Bohac S V, Cowland C N, et al. Development of a fully flexible hydraulic valve actuation engine, part Ⅱ: impact on MPFI engines[M]. Michigan:GPC, Ann Arbor,2002.
3Turner C W, Babbitt G R, Balton C S, et al. Design and control of a two-stage electro-hydraulic valve actuation system[C]. SAE 2004-01-1265.
4Hedrick J K, Albert P. Variable valve timing by means of a hydraulic actuation[C]. SAE 2000-01-1220.
5Flueckiger L, Bohac S V, Cowland C N, et al. Development of a fully flexible hydraulic valve actuation engine, part I: hydraulic valve actuation system development[M]. Michigan: GPC, Ann Arbor, 2002.
6Hedrick J K, Albert P. Variable valve timing by means of a hydraulic actuation[C], SAE 2000-01-1220.