Patent ID: 7571708
Filing Date: 2009-08-11
Classification: F02B,Y02T

Abstract:
1. An engine assembly comprising: an engine block defining a cylinder bore; a piston disposed within the cylinder bore and reciprocally displaceable from a first position during an intake stroke to a second position corresponding to a position between 70 percent and 100 percent of the intake stroke, the cylinder bore and the piston 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 directed toward an upper surface of the piston when the piston is in the first and the second positions, the entire fuel flow provided by the fuel injector defining a flow pattern having a central axis extending at an angle relative to the cylinder bore and intersecting the upper surface of the piston when the piston is in the second position, the entire fuel flow defining an outer periphery extending around the central axis, the outer periphery having a radially innermost portion circumferentially aligned with the injector relative to the cylinder bore and a radially outermost portion opposite the radially innermost portion, the radially outermost portion extending in a direction toward the piston and intersecting the upper surface of the piston when the piston is in the second position.