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 |
20090005956 | Knocking Determination Device and Knocking Determination Method of Internal Combustion Engine - An engine ECU executes a program including a step of setting a search range of the crank angle of a peak value P that is the largest integrated value in a vibration waveform of an engine detected by calculating integrated values that are integrals of output voltage values of a knock sensor for every five degrees of a crank angle such that the search range may include the crank angle increasing with increase in engine speed NE, and a step of detecting the crank angle of the largest integrated value in the search range, and setting the detected crank angle as the crank angle of peak value P in the vibration waveform. At the crank angle based on the crank angle of peak value P, the vibration waveform is compared with a knock waveform model. | 01-01-2009 |
20090038384 | KNOCKING DETERMINATION DEVICE AND METHOD FOR INTERNAL COMBUSTION ENGINE - Out of synthesized waveforms of vibrations in a first frequency band A to a third frequency band C, a knock magnitude N is calculated by using a portion β having an integrated value greater than a reference magnitude in a knock region but not using a portion having an integrated value greater than the reference magnitude out of the knock region (i.e., a region obtained by excluding the knock region from a knock detecting gate). In a case where knock magnitude N is greater than a determination value V(KX), it is determined that knocking occurs. In contrast, in a case where knock magnitude N is not greater than determination value V(KX), it is determined that no knocking occurs. | 02-12-2009 |
20090043484 | METHOD AND DEVICE FOR CONTROL IGNITION TIMING THROUGH KNOCK CONTROL IN AN INTERNAL COMBUSTION ENGINE - An engine ECU executes a program including: determining whether or not a condition for stopping knocking determination is satisfied; setting a flag of stopping correction of a determination value to “ON”; calculating a knock determination level based on the extracted magnitude value; and when the correction stop flag is not “ON”, decreasing or increasing the determination value in accordance with a knock proportion KC that is a proportion of magnitude values greater than the knock determination level. The knock determination level is calculated even when the correction stop flag is “ON”. | 02-12-2009 |
20090150058 | KNOCK DETERMINATION DEVICE AND METHOD FOR INTERNAL COMBUSTION ENGINE - An engine ECU executes a program including the steps of: calculating a coefficient of correlation K in accordance with a result of comparing a waveform of a vibration of a frequency band including a resonance frequency of an engine with a knock waveform model previously created as a waveform of a vibration caused when the engine knocks (S | 06-11-2009 |
20090158816 | KNOCKING DETERMINATION APPARATUS AND KNOCKING DETERMINATION METHOD FOR INTERNAL COMBUSTION ENGINE - A knocking judgement method for an internal combustion engine, in which an engine ECU executes a program judging whether or not such ones of integrated values calculated by integrating the output of a knock sensor at every five degrees of a crank angle are larger than a tentative knock judgement value, in vibrations of a fourth frequency band containing the resonance frequency of the engine, tentatively judging that a knocking has occurred, in case the integrated value larger than the tentative knock judgement value is a predetermined number or more, and judging that no knocking has occurred, in case the integrated value larger than the tentative knock judgement value is not more than the predetermined number. | 06-25-2009 |
20090165746 | DEVICE AND METHOD FOR CONTROLLING IGNITION TIMING OF INTERNAL COMBUSTION ENGINE - An engine ECU executes a program including: a step (S | 07-02-2009 |
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 |
20100162794 | DEVICE AND METHOD FOR DETERMINING KNOCKING OF INTERNAL COMBUSTION ENGINE - An engine ECU executes a program including the steps of: calculating an absolute value ΔS(I) of the deviation of the vibration waveform detected by a knock sensor and a knock waveform model from each other at each crank angle; when ΔS(I) greater than threshold value ΔS( | 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 |
20100212634 | DEVICE AND METHOD FOR CONTROLLING IGNITION TIMING OF INTERNAL COMBUSTION ENGINE - An engine ECU executes a program that includes the steps of: calculating (S | 08-26-2010 |
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 |