System and method for variable valve actuation in an internal combustion engine
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United States of America Patent
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Feb 3, 2009
Grant Date -
Apr 20, 2006
app pub date -
Jul 27, 2005
filing date -
Oct 14, 2004
priority date (Note) -
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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.
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