Patent ID: 6941929

Claim:
A combustion control system of an internal combustion engine comprising: a specific gravity detecting section which detects a specific gravity of fuel used in the engine; a combustion control section which controls combustion in the engine on the basis of the specific gravity; and a temperature detecting section which detects an engine temperature indicative value; an engine speed detecting section which detects an engine speed; a load detecting section which detects a load of the engine; and a fuel injection apparatus; wherein the combustion control section controls a fuel injection timing of the fuel injection apparatus by obtaining a standard fuel injection timing from a map indicative of a relationship among the standard fuel injection timing, the engine speed and the load, by obtaining one of a correction value and a correction coefficient of the fuel injection timing on the basis of the engine temperature indicative value and the specific gravity, and by correcting the standard fuel injection timing by one of the correction value and the correction coefficient.