Patent ID: 7077106

Claim:
A spark ignition internal combustion engine comprising: a spark plug for each cylinder; two intake valves for each cylinder; direct fuel injector for injecting fuel into a cylinder in such a manner as to form a rich layer at the center of the cylinder; a port fuel injector that injects fuel within an intake port to direct the fuel toward said two intake valves; and injection control means for causing said direct fuel injector and said port fuel injector to inject fuel on the same engine cycle; wherein, when each of said two intake valves is divided into an inner region and an outer region with a dividing line that runs orthogonal to a line segment joining the centers of said two intake valves and passes through the center of either of said two intake valves, said port fuel injector is positioned so that the amount of the fuel directed toward said outer region is larger than the amount of the fuel directed toward said inner region.