| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device of an internal combustion engine, which sufficiently reduces combustion noise of a fuel injection device of the internal combustion engine, particularly, specific vibration strength in a specific frequency area. SOLUTION: This fuel injection control device has: a crank angle sensor 19 outputting a crank angle signalΔθof the multicylinder internal combustion engine; an injection control means AO injecting fuel from a fuel injection valve 14 of the internal combustion engine 1; a combustion sound sensor 6 arranged by one in a position respectively different in a distance between respective cylinders and detecting a sound or vibration generated in response to combustion from the respective cylinders; a combustion detecting period setting means A3 setting a combustion detecting section #nE with every cylinder for detecting that the respective cylinders are put in a combustion state; an identification means A2 identifying the sound or the vibration with every cylinder, based on output of the crank angle sensor and a detecting result of a combustion vibration detecting means in the combustion detecting section #nE; and a correcting means A4 correcting an injection control quantity of the injection control means with every cylinder in response to vibration strength indexes RK#1 to RK#4 being an identification result of the identification means A2. COPYRIGHT: (C)2008,JPO&INPIT
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