Internal-combustion engines – Four-cycle – Having subcharger associated with the cylinder
Reexamination Certificate
2006-05-02
2006-05-02
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Four-cycle
Having subcharger associated with the cylinder
Reexamination Certificate
active
07036483
ABSTRACT:
Dual-lobed cams mounted on the intake camshaft of a diesel engine selectively retard timing of the intake valve closure. The purpose of retarding timing of the intake valves is to retard valve closing sufficiently to shorten the effective compression strokes of the pistons and thus reduce the effective compression ratio. This occurs when the intake valves remain open past piston bottom dead center for a desired period into the normal compression stroke phase of engine operation. This reduces compression pressures so that combustion temperatures are reduced and exhaust emissions, primarily NOx, may be thus limited under conditions of warmed-up engine operation. Dual-lobed cams may also be employed to retard timing of the intake valve opening to throttle admitted air during cold running conditions to effect higher in-cylinder charge temperatures to reduce hydrocarbon and white smoke emissions due to poor ignition and incomplete combustion.
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El Tahry Sherif H.
Krieger Roger B.
Benton Jason
General Motors Corporation
Marra Kathryn A.
Yuen Henry C.
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