Patent ID: 8205489

Claim:
A knocking determination device for an internal combustion engine, comprising: a crank position sensor ( 306 ) detecting a crank angle of said internal combustion engine ( 100 ); a knock sensor ( 300 ) detecting a magnitude of vibration of said internal combustion engine ( 100 ), said magnitude being associated with a crank angle; and an operation unit ( 200 ), said operation unit ( 200 ) detecting a waveform of vibration in a first interval of crank angle, based on the magnitude of vibration of said internal combustion engine ( 100 ), said operation unit ( 200 ) calculating a first value based on a difference between a magnitude on said detected waveform and a magnitude on a waveform model determined in advance as a reference waveform of vibration of said internal combustion engine ( 100 ), in a second interval of crank angle, said operation unit ( 200 ) calculating a second value such that the second value is smaller as the number of revolutions of an output shaft of, said internal combustion engine ( 100 ) is smaller, said operation unit ( 200 ) calculating a third value based on said first value and said second value, and said operation unit ( 200 ) determining whether or not knocking has occurred in said internal combustion engine ( 100 ), based on said third value.