Patent ID: 8056396

Claim:
A knock detection device for an internal combustion engine, the knock detection device comprising: a knock signal output means for outputting an output signal of which waveform is varied according to a knock caused while the internal combustion engine is operated; a multiple-frequency-ranges vibration intensity extraction means for extracting time-varying patterns of vibration intensities in multiple frequency ranges from the output signal of the knock signal output means; and a knock determination means for evaluating a correlation between the time-varying patterns of vibration intensities in multiple frequency ranges and a reference model expressing a feature of the knock in order to make a knock determine on the basis of the correlation; wherein the knock determination means compares a correlation value with a determination threshold in order to make a knock determination, the correlation value being an evaluation of the correlation between the time-varying patterns of vibration intensities in multiple frequency ranges and the reference model expressing a feature of the knock.