Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Reexamination Certificate
2005-08-30
2005-08-30
Demon, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
C123S090150, C123S090160, C123S090310, C251S030010, C251S129030, C251S129060, C251S129070, C251S129080, C029S025350, C029S254000
Reexamination Certificate
active
06935287
ABSTRACT:
An engine valve actuation system is provided that includes an engine valve that is movable between a first position where the engine valve prevents a flow of fluid and a second position where the engine valve allows a flow of fluid. A cam assembly is operatively connected to the engine valve to move the engine valve between the first position and the second position in a predetermined actuation pattern. A valve actuator having a piezo electric device is operable to change the movement of the engine valve from the predetermined actuation pattern. A controller is adapted to control the piezo electric device to achieve a desired valve actuation pattern.
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Caterpillar Inc
Demon Thomas
Finnegan Henderson Farabow Garrett & Dunner
Riddle Kyle M.
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