Patent ID: 6928966
Filing Date: 2005-08-16
Classification: F01L

Abstract:
1. A valve actuator assembly for an internal combustion engine, the assembly comprising: a movable engine valve; a movable spool valve; a spring biasing the engine valve to a closed position; a driving channel interconnecting the spool valve and the engine valve; an intermediate channel interconnecting the spool valve and first and second on/off valves; a first feedback channel interconnecting the engine valve, the spool valve and a third on/off valve; a second feedback channel interconnecting the engine valve, the spool valve and a fourth on/off valve; a control operable to energize and de-energize the first and second on/off valves to selectively provide fluid flow to and from the spool valve and the driving channel to position the engine valve between an open position and the closed position; and a control operable to energize and de-energize the third and fourth on/off valves to selectively enable and disable the feedback channels to control the motion of the spool valve.