Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Reexamination Certificate
2006-06-20
2006-06-20
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
C123S090440, C123S347000, C123S350000
Reexamination Certificate
active
07063055
ABSTRACT:
An engine valve actuation system is provided. The system includes an engine valve moveable between a closed position and an open position. A spring is operatively connected to the engine valve to bias the engine valve towards the closed position. An actuator is operatively connected to the engine valve and is operable to selectively engage the engine valve to prevent the engine valve from returning to the closed position and to release the engine valve to allow the engine valve to return to the closed position. A sensor is configured to provide information related to the operation of the actuator. A controller is configured to transmit a signal to the actuator to engage the engine valve to prevent the engine valve from returning to the closed position and to release the engine valve to the allow the engine valve to return to the closed position. The controller is further configured to receive a signal from said sensor and to identify when the actuator fails to engage the engine valve in response to the transmitted signal or when the actuator fails to release the engine valve.
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Bloms Jason Kenneth
Faletti James J.
Holtman Richard Herman
Leman Scott Alan
Pierpont David Andrew
Caterpillar Inc.
Chang Ching
Denion Thomas
Finnegan Henderson Farabow Garrett & Dunner LLP
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