| 摘要 |
PROBLEM TO BE SOLVED: To detect vibration resulting from knocking by suppressing noise, and distinguish a vibration waveform resulting from knocking from a vibration waveform resulting from noise by a vibration waveform in which the vibration resulting from noise may be taken. SOLUTION: An engine ECU 200 comprises a band pass filter (1) 410 extracting only the vibration of a first frequency band A, a band pass filter (2) 420 extracting only the vibration of a second frequency band B, a band pass filter (3) 430 extracting only the vibration of a third frequency band C, and a band pass filter (4) 440 extracting only the vibration of a fourth frequency band D including the first to third frequency bands. The engine ECU 200 determines whether knocking occurs or not based on the peak values of the intensity of vibration in the vibration waveform of the fourth frequency band D and the synthetic waveform of the first to third frequency bands. COPYRIGHT: (C)2007,JPO&INPIT
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