Patent ID: 7802554

Claim:
A direct injection spark ignition internal combustion engine comprising: a fuel injection valve; and a fuel injection control device that controls fuel injection such that a fuel is injected from an upper area of an engine cylinder toward the top face of a piston through the fuel injection valve, wherein the fuel injection control device switches a thrust force of the fuel injected from the fuel injection valve between at least two levels, wherein the thrust force of the injected fuel becomes weaker when the position of the piston is high in the engine cylinder compared to when the position of the piston is low in the engine cylinder, wherein the fuel injection control device changes a thrust force switching piston position, which is the position of the piston at which the thrust force of the injected fuel is switched, based on at least one of the engine load, the engine speed, and the engine temperature, and wherein the fuel injection control device changes the thrust force switching piston position such that the thrust force switching piston position is highest when the engine load is equal to a predetermined engine load, the thrust force switching piston position is lowered as the engine load decreases below the predetermined engine load, and the thrust force switching piston position is lowered as the engine load increases above the predetermined engine load.