Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Reexamination Certificate
2007-04-17
2007-04-17
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
C123S090130, C123S090140, C123S090270
Reexamination Certificate
active
11033784
ABSTRACT:
A method and apparatus for hydraulically actuating a gas exchange valve using a low-pressure, substantially constant flow fluid source applied to at least one actuator cylinder piston coupled to the gas exchange valve. The actuator piston slides within the actuator cylinder upon application of pressure from the fluid for actuating the gas exchange valve. The pressure is continuously variable and builds upon application to the cylinder piston until the valve unseats. A pressure sensor is used to monitor the pressure to provide feedback about the operation of system and to provide variable motion control of the gas exchange valve.
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Denion Thomas
Eshete Zelalem
Temic Automotive of North America, Inc.
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