ENGINE VALVE ACTUATOR ASSEMBLY WITH DUAL HYDRAULIC FEEDBACK

摘要

A valve actuator assembly for an engine includes a movable engine valve and a movable spool valve. The valve actuator assembly also includes a driving channel interconnecting the spool valve and the engine valve and a first feedback channel and a second feedback channel interconnecting the spool valve and the engine valve. The valve actuator assembly includes an actuator operatively cooperating with the spool valve to position the spool valve to prevent and allow fluid flow in and out of the driving channel to position the engine valve. The valve actuator assembly further includes a first on/off valve and a second on/off valve in fluid communication with the first feedback channel and the second feedback channel to enable and disable the first feedback channel and the second feedback channel, whereby the first on/off valve and the second on/off valve control motion of the spool valve.