Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Reexamination Certificate
2005-05-03
2005-05-03
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
C123S090110, C123S090150, C091S318000
Reexamination Certificate
active
06886510
ABSTRACT:
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.
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Bucknor Norman Kenneth
Sun Zongxuan
Denion Thomas
Eshete Zelalem
General Motors Corporation
Marra Kathryn A.
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