Patent ID: 6651612
Filing Date: 2003-11-25
Classification: F02B,F02F,Y02T

Abstract:
An in-cylinder injection type, spark-ignition internal combustion engine, comprising:a spark plug disposed at an upper portion of a cylinder; a fuel injection valve through which fuel is directly injected into the cylinder; and a piston having a top face and a cavity formed in a first part of the top face, the cavity being located closer to the fuel injection valve with respect to a center of the piston so as to bring the fuel injected through the fuel injection valve toward the spark plug, wherein a space formed in the cylinder at a top dead center of a compression stroke of the piston includes a first space in which a center of the cavity is located, and a second space, the first space being located on one side of a plane that passes through a center axis of the spark plug in parallel with a center axis of the cylinder and is perpendicular to a radial direction in which the center of the cavity deviates from the center of the piston, and the second space being located on the other side of the plane, the top face of the piston is designed to set a volumetric difference between the first space and the second space to be within a range between 6:4 and 5:5.