KNOCK DETERMINATION DEVICE AND KNOCK DETERMINATION METHOD FOR INTERNAL COMBUSTION ENGINE

摘要

An engine ECU executes a program including the steps of: extracting vibration intensities of a plurality of frequency bands from vibration detected by a knock sensor, multiplying the extracted vibration intensity of each frequency band by a weight coefficient and adding the results in correspondence with crank angles to calculate integrated values of every five degrees (S104); calculating a coefficient of correlation K based on a result of comparison between a vibration waveform of a frequency band E and a knock waveform model prepared in advance (S116); calculating a knock intensity N (S118); determining occurrence of knocking in accordance with the calculated coefficient of correlation K and the knock intensity N (S122); and determining no occurrence of knocking in accordance with the calculated coefficient of correlation K and the knock intensity N (S126).