| 摘要 |
PROBLEM TO BE SOLVED: To suppress degradation of an exhaust emission caused by a individual difference of an injection valve. SOLUTION: This fuel injection controller has injection valves 3 which respectively inject fuel into cylinders 2 of an engine 1, an exhaust emission purifying catalyst 5 and an air-fuel ratio sensor 6 which are provided in an exhaust emission passage 4, a fuel injection amount calculating means 9 which calculates a fuel injection amount TAU according to both an output of the air-fuel ratio sensor 6 and an operation state of the engine 1, an air-fuel ratio control variable setting means 10 for setting an air-fuel ratio control variable TDR(L) of an air-fuel ratio correction coefficient FAF which corrects the fuel injection amount TAU such that an air-fuel ratio is shifted to a rich side or a lean side, and a fuel injection amount increase/decrease means 11 for increasing or decreasing the fuel injection amount TAU, which is calculated by the fuel injection amount calculating means 9 by use of the air-fuel ratio control variable TDR(L), by a prescribed increase constant a or a prescribed decrease constantβso as to feed the increased or decreased fuel injection amount TAU to each the cylinder 2. Thereby, because the fuel injection amount TAU is increased or decreased to be fed to each the cylinder 2, the air-fuel ratio becomes rich. Accordingly, an amount of hydrogen in an exhaust gas is stably increased, while deviation from richness of the output of the air-fuel ratio sensor 6 can be corrected by adjustment control.
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