Patent ID: 7637247

Claim:
A device for determining knocking of an internal combustion engine, comprising an operation unit, wherein said operation unit detects a magnitude of vibration in a first frequency band that includes a frequency of vibration due to knocking, out of vibration occurring in said internal combustion engine, said operation unit detects a magnitude of vibration in a second frequency band that includes said first frequency band and that is broader than said first frequency band, out of the vibration occurring in said internal combustion engine, said operation unit detects a waveform of the vibration in the second frequency band, based on the magnitude of the vibration in said second frequency band, said operation unit determines whether or not a magnitude greater than a predetermined threshold value is detected from the vibration in said second frequency band, when it is determined that the magnitude greater than said predetermined threshold value is detected from the vibration in said second frequency band, said operation unit determines whether or not knocking has occurred based on a result of comparison between the waveform detected from the magnitude of the vibration in said second frequency band and a waveform model that is a reference of the vibration occurring in said internal combustion engine and on the magnitude of the vibration in said first frequency band, and when it is determined that the magnitude greater than said predetermined threshold value is not detected from the vibration in said second frequency band, said operation unit determines that knocking has not occurred.