Patent ID: 7565893
Filing Date: 2009-07-28
Classification: F02B,F02D,Y02T

Abstract:
1. An engine assembly comprising: an engine block defining a cylinder bore; a piston disposed within the bore at a position corresponding to at least 50 percent of an intake stroke of the piston, the piston and the cylinder bore partially defining a combustion chamber; and a spark ignited direct injection fuel system including a fuel injector that provides a fuel flow to the combustion chamber during the intake stroke, the fuel flow including a plume having an angular span, the plume having a fuel volume associated therewith, a first portion of the fuel volume associated with the plume including at least 30 percent of the fuel volume and being maintained within the angular span a distance into the cylinder bore corresponding to the piston position, a second portion of the fuel volume including a remainder of the fuel volume associated with the plume and diffusing to a region outside of the angular span as the plume travels the distance into the cylinder bore, the fuel within the plume traveling at a first velocity greater than a second velocity defined by a mean velocity of the piston when the engine is operating at an engine speed of greater than 2000 revolutions per minute.