Patent ID: 7822533

Claim:
A knocking determination device of an internal combustion engine comprising: a crank position sensor detecting a crank angle of said internal combustion engine; and an operation unit, wherein said operation unit detects a waveform of vibration of said internal combustion engine in a first range of the crank angle, in a manner corresponding to the crank angle, detects a crank angle satisfying a predetermined condition in a second range included in said first range, determines whether said internal combustion engine knocked or not, based on a result of a comparison performed, at the crank angle based on the crank angle satisfying said condition, between said detected waveform and a waveform model having a width smaller than that of said first range and defined as a reference of the waveform of the vibration of said internal combustion engine, detects an operation state of said internal combustion engine, and sets said second range according to the operation state of said internal combustion engine.