Patent application number | Description | Published |
20080262705 | Internal Combustion Engine Knock Determination Device and Knock Determination Method - An engine ECU executes: calculating 15-degrees integrated value integrating vibration intensity for each of six crank angle ranges; detecting an amount of change in the 15-degrees integrated value between ignition cycles; specifying two ranges having larger amounts of change; specifying a crank angle having intensity larger than that of a neighboring crank angle in a search range determined to be the same as the specified ranges; calculating a coefficient of correlation K corresponding to a difference between a vibration waveform and a knock waveform model while the specified crank angle is matched with a timing at which intensity peaks in the knock waveform model; and, if the coefficient of correlation K is larger than a threshold value K( | 10-23-2008 |
20080294328 | Internal Combustion Engine Knock Determination Device and Knock Determination Method - An engine ECU executes a program including: the step (S | 11-27-2008 |
20100162793 | DEVICE AND METHOD FOR DETERMINING KNOCKING OF INTERNAL COMBUSTION ENGINE - An engine ECU executes a program including calculating a correlation coefficient by dividing the sum of respective absolute values, which are each a difference between a magnitude in an engine vibration waveform and a magnitude in a knock waveform model for every crank angle, by an area corresponding to magnitudes equal to or larger than a positive reference value in the knock waveform model, and determining whether or not knocking has occurred based on the correlation coefficient. | 07-01-2010 |
20100162795 | KNOCKING DETERMINATION DEVICE AND KNOCKING DETERMINATION METHOD FOR INTERNAL COMBUSTION ENGINE - An engine ECU executes a program including the steps of: detecting a magnitude of vibration of an engine (S | 07-01-2010 |
20110146384 | KNOCK DETERMINATION DEVICE AND KNOCK DETERMINATION METHOD FOR INTERNAL COMBUSTION ENGINE - An engine ECU executes operations including: 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; calculating a coefficient of correlation based on a result of comparison between a vibration waveform of a frequency band and a knock waveform model prepared in advance; calculating a knock intensity; determining occurrence of knocking in accordance with the calculated coefficient of correlation and the knock intensity; and determining no occurrence of knocking in accordance with the calculated coefficient of correlation and the knock intensity. | 06-23-2011 |