| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device for an internal combustion engine capable of restraining torque fluctuation of the internal combustion engine, while restraining lowering of air-fuel ratio controllability and emission. SOLUTION: At a time of an uniform combustion operation of the engine 11, an increase/decrease correction of an fuel injection amount by a feedback correction coefficient FAF is carried out to control an air-fuel ration of the engine 11 to be a stoichiometrical air-fuel ratio. At the time, a spark advance/spark delay correction of fuel injection timing is carried out for decreasing the torque fluctuation of the engine 11, depending on the increase/decrease correction of the fuel injection amount. That is, at a time of the increase correction of the fuel injection amount, the spark delay correction of the fuel injection timing by a fuel injection timing correction amount AINJ is carried out. At a time of the decrease correction of the fuel injection amount, the spark advance correction of the fuel injection timing by the fuel injection timing correction amount AINJ is carried out. By the above fuel injection timing correction, excessive change in output torque of the engine 11 according to the increase/decrease correction of the fuel injection amount is restrained, resulting in the torque fluctuation d1n is also restrained.
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