Patent ID: 8151741

Claim:
A control device for a premixed charge compression ignition internal combustion engine having a crankshaft, the engine using light oil or a composite fuel of light oil and other fuels as main fuel and conducting compression ignition of the main fuel in a combustion chamber, comprising: a fuel supply means for supplying the main fuel to the engine; a hydrogen supply means for supplying a gas containing hydrogen to the engine; a fuel supply control means for controlling a main fuel injection timing and a main fuel injection period via the fuel supply means a hydrogen supply control means for controlling a supply timing and a supply period of gas containing hydrogen by way of the hydrogen supply means; and a crank angle position sensor which detects a rotation angle of the crankshaft and supplies a signal of the detected rotation angle to the fuel supply control means and the hydrogen supply control means, wherein the fuel supply control means controls the main fuel injection timing and the main fuel injection period in accordance with the signal of the detected rotation angle that is supplied by the crank angle position sensor, based on a premixed charge compression ignition combustion condition of the engine, and wherein the hydrogen supply control means controls the gas containing hydrogen injection timing and the gas containing hydrogen injection period in accordance with the signal of the detected rotation angle that is supplied by the crank angle position sensor, based on the premixed charge compression ignition combustion condition of the engine, wherein the fuel supply control means retards the main fuel injection timing from top dead center of the engine in a case of the engine being in a moderate and high operating region, and wherein the hydrogen supply control means controls the supply amount of the gas so that a hydrogen concentration of intake air of the engine becomes higher than a flammability limit in concert with when the main fuel injection timing is retarded by the fuel supply control means.