ENGINE VALVE AKTUATOR ASSEMBLY WITH DUAL HYDRAULIC FEEDBACK

摘要

A valve actuator assembly (10) for an engine includes a movable engine valve (20) and a movable spool valve (34). The valve actuator assembly (10) also includes a driving channel (42) interconnecting the spool valve (34) and the engine valve (20) and a first feedback channel (46) and a second feedback channel (52) interconnecting the spool valve (34) and the engine valve (20). The valve actuator assembly includes an actuator (53) operatively cooperating with the spool valve (34) to position the spool valve to prevent and allow fluid flow in and out of the driving channel (42) to position the engine valve (20). The valve actuator assembly (10) further includes a first (64) on/off valve and a second on/off valve (76) in fluid communication with the first feedback channel (64) and the second feedback channel (52) to enable and disable the first feedback channel (46) and the second feedback channel (52), whereby the first on/off valve (64) and the second on/off valve (76) control motion of the spool valve. <IMAGE>