公开(公告)号：US6044815A

公开(公告)日：2000-04-04

申请号：US152497

申请日：1998-09-09

申请人： William de Ojeda

发明人： William de Ojeda

IPC分类号： F01L9/02

CPC分类号： F01L9/02

摘要： A hydraulically-assisted engine valve actuator and method for assisting in the actuation of an engine valve includes a translatable pilot valve that is operably coupled to and controlled by a pilot valve positioning system. A servo piston is in fluid communication with the pilot valve and is operably coupled to the engine valve. The pilot valve positioning system controls translation of the pilot valve to meter hydraulic fluid under pressure to and from the servo piston. The hydraulic fluid under pressure causes the servo piston to closely follow the translation of the pilot valve to effect a desired profile of translational opening and closing motion of the engine valve.