Patent ID: 7874200

Claim:
A knocking determination device for an internal combustion engine, comprising: a waveform detecting unit that detects a vibration waveform of a frequency band corresponding to a radial mode as a resonance mode of combustion pressure propagation in a cylinder of said internal combustion engine; a storage unit that stores in advance a vibration waveform of the frequency band corresponding to said radial mode; and a determining unit that determines whether knocking occurred in said internal combustion engine or not, based on a result of comparison between said detected waveform and said stored waveform, wherein the vibration waveform stored in advance by the storage unit is a knock waveform model corresponding to a knocking state of said internal combustion engine, wherein the comparison is between the detected waveform after the detected waveform has been normalized, and the vibration waveform stored in advance has a magnitude represented by a dimensionless number ranging from 0 to 1, and wherein the determining unit calculates a coefficient of correlation K corresponding to a deviation between the normalized vibration waveform and the knock waveform model.