Patent ID: 7353814

Claim:
An apparatus for controlling fuel injection of an internal combustion engine that has a fuel injection valve, comprising: a feedback correction value that is changed based on an actual air-fuel ratio to conform the actual air-fuel ratio to a target air-fuel ratio of the engine; a limit value of the feedback correction value; a fuel injection time controlling the fuel injection valve, the fuel injection time being set based on the target air-fuel ratio and the feedback correction value; a permissible minimum time of the fuel injection time, wherein, when a value of the fuel injection time is determined to be less than the permissible minimum time based on the target air-fuel ratio, the apparatus limits a lowest value of the feedback correction value to the limit value, the feedback correction value includes a proportional term and an integral term, the proportional term being computed based on a difference between an actual fuel injection amount and a theoretical fuel injection amount that is required for an actual air-fuel ratio to be equal to the target air-fuel ratio, the integral term being computed based on a process for accumulating the difference at predetermined intervals, and wherein the apparatus initializes the integral term when the apparatus has canceled limiting the feedback correction value as an intake air amount of the engine increases, when limiting the feedback correction value is canceled as the intake air amount of the engine increases, the apparatus initializes the integral term based on a condition that the integral term has a value that decreases the feedback correction value.