Patent ID: 7918085

Claim:
A fuel injection control device for an internal-combustion engine which includes fuel injecting means for injecting fuel into a combustion chamber, and a catalysis provided to an exhaust path of said internal-combustion engine, said fuel injection control device comprising: fuel cut processing executing means for performing fuel cut processing which is processing for inhibiting fuel injection from said fuel injection means corresponding to the operation state of said internal-combustion engine; and post-fuel-cut-processing rich air/fuel ratio control means for controlling the fuel amount injected from said fuel injecting means such that the air/fuel ratio of gas flowing into said catalysis is richer than the theoretical air/fuel ratio after said fuel cut processing, wherein said post-fuel-cut-processing rich air/fuel ratio control means adjusts the fuel amount injected from said fuel injecting means such that the air/fuel ratio of the gas flowing into said catalysis is adjusted to a first rich air/fuel ratio, which is a value less than 11, for a predetermined short period of time alone from the end of said fuel cut processing, following which said air/fuel ratio is switched to a second rich air/fuel ratio, which is a value equal to or greater than 11 and less than the theoretical air/fuel ratio, immediately after said short period of time.