Patent ID: 7500468

Claim:
A device for determining knocking of an internal combustion engine, comprising: a crank position sensor detecting a crank angle of said internal combustion engine; a knock sensor detecting a magnitude of vibration of said internal combustion engine in association with the crank angle; and an operation unit, wherein said operation unit detects a waveform of vibration in a first interval from a first crank angle to a second crank angle, based on the magnitude of vibration of said internal combustion engine, said operation unit determines whether or not a predetermined condition is satisfied, based on a result of comparison between said detected waveform and a waveform model predetermined for use as a reference waveform of vibration in a second interval of at most said first interval, said operation unit calculates an integrated value by integrating magnitudes that are included in said detected waveform and that are in a third interval of at most said first interval, based on whether or not said condition is satisfied, and said operation unit determines whether or not knocking has occurred in said internal combustion engine, based on said integrated value.