| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device of a multi-cylinder diesel engine capable of reducing the sound pressure level of a sound emitted from an engine in a specific frequency band. SOLUTION: This fuel injection control device comprises a noise meter 16 measuring the sound emitted from the multi-cylinder diesel engine 10, an FFT 17 analyzing the frequency of an emitted sound signal measured by the noise meter 16, and an ECU 15 controlling the injection of a fuel for each cylinder 11. The ECU 15 interferes combustion/radiation noises from the cylinders 11 with each other by changing the fuel injection control constants of the specific cylinder based on the results of the analysis of the FFT 17. The fuel injection control constants are corrected in the order of pilot injection timing, pilot injection amount, main injection timing, and injection pressure until an actual frequency component analyzed by the FFT 17 matches a specified target value. COPYRIGHT: (C)2005,JPO&NCIPI
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