Patent ID: 7206691

Claim:
A knock determination device for an internal combustion engine, comprising: means for detecting a magnitude of a vibration of said internal combustion engine at a first frequency band; means for detecting a magnitude of a vibration of said internal combustion engine at a second frequency band that is different from said first frequency band; crank angle detecting means for detecting a crank angle of said internal combustion engine; waveform detecting means for detecting a waveform of a vibration of said internal combustion engine at predetermined crank angle intervals as based on the magnitude of the vibration at said first frequency band; storing means for storing in advance a waveform of a vibration of said internal combustion engine; and determining means for determining whether said internal combustion engine knocks, as based on a result of comparing the detected waveform with the stored waveform as well as on the magnitude of the vibration at said second frequency band.