Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Reexamination Certificate
2005-08-09
2005-08-09
Huynh, Hai (Department: 3747)
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
C123S321000, C123S090160
Reexamination Certificate
active
06925976
ABSTRACT:
A variable valve actuation system for providing discrete exhaust and intake valve lift profiles for various operating modes of an internal combustion engine. The variable valve actuation system includes exhaust and intake rocker assemblies, exhaust and intake hydraulic extension devices operatively coupling corresponding rocker assemblies with respective engine valves and exhaust and intake control valves for selectively supplying the pressurized hydraulic fluid to the extension devices so as to independently switch them between a pressurized condition and a depressurized condition. The engine further includes an exhaust brake provided to initiate a small lift of the exhaust valve during the engine braking operation while the exhaust extension device maintains the exhaust valve open during a compression stroke for bleeder-compression release braking. The exhaust and intake valves can be adjusted independently to provide combinations of valve lift modes.
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Ratinaud, F. “Les freins moteurs,” Dossier v. 2415 pp. 30-36, Mar. 1999.
Harttey John P.
Israel Mark A.
Berenato White & Stavish LLC
Huynh Hai
Jenara Enterprises Ltd.
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