Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2005-07-27
2009-02-03
Eshete, Zelalem (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090160, C123S090120
Reexamination Certificate
active
07484483
ABSTRACT:
A system and method for actuating one or more engine valves is provided. In particular, systems and methods for providing variable valve actuation to improve engine performance are provided. Embodiments of the present invention may be used in conjunction with positive power, engine braking, and/or exhaust gas recirculation operation of an internal combustion engine. In one embodiment, the system comprises: a valve train element; a housing disposed intermediate the valve train element and the engine valve; an outer piston slidably disposed in a bore formed in the housing, the outer piston having a cavity formed therein; an inner piston slidably disposed in the outer piston cavity; and a valve in communication with the outer piston cavity, the valve having more than one position, wherein the position of the valve determines the timing of the engine valve event.
REFERENCES:
patent: 5829397 (1998-11-01), Vorih et al.
patent: 6192841 (2001-02-01), Vorih et al.
patent: 6374784 (2002-04-01), Tisher et al.
patent: 2003/0106532 (2003-06-01), Tian et al.
patent: 2004/0103868 (2004-06-01), Engelberg
Swanbon Bruce A.
Vanderpoel Richard E.
Yang Zhou
Eshete Zelalem
Jacobs Vehicle Systems, Inc.
Kelley Drye & Warren LLP
Yohannan, Esq. David R.
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