To provide a fuel injection control device of an internal combustion engine achieving compatibility between a reduction in noises and NOx and a reduction in PM contained in discharge air.
The pressure of a fuel supplied to an injector 12 in pilot injection is set to be lower than the pressure of the fuel supplied to the injector 12 in main injection. Thus, the fuel jetted from the injector 12 in the pilot injection generates a thick mixture around the injector 12. Therefore, the ignitability of the fuel is improved even with a small amount of the pilot injection. On the other hand, in the main injection and after injection, the injector 12 jets the fuel at a pressure higher than that in the pilot injection. Therefore, the atomized fuel is supplied to a combustion chamber 18 that becomes high in pressure by the combustion of the fuel, and the combustion of the fuel is uniformized. Thus, the reduction in the noises and NOx and the reduction in the PM contained in the discharge air in the main injection and the after injection are achieved.
ITO MASAHARU
SASAKI SATORU
DENSO CORP