| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device for an internal combustion engine capable of reducing rotational fluctuation of the internal combustion engine due to individual difference of fuel injection valves of each cylinder, and capable of preventing deterioration of exhaust gas performance by suppressing abnormal dropping of an excess air ratio of each cylinder. SOLUTION: Pmi of each cylinder is conformed to a target Pmi by correction of a fuel injection amount with respect to each cylinder to reduce rotational fluctuation of the engine due to dispersion of combustion pressures. At this time, in the #4 cylinder with an insufficient Pmi, the excess air ratio drops below aλlower limit due to increase correction of the injection amount for achieving the target Pmi, but it is maintained at an excess air ratio equivalent to theλlower limit by limiting the increase correction. Besides, fuel to the #1 cylinder is increased for an insufficient portion of the fuel injection amount to the #4 cylinder to conform an average Pmi to the target Pmi. COPYRIGHT: (C)2011,JPO&INPIT
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