Internal-combustion engines – Spark ignition timing control – Electronic control
Reexamination Certificate
2007-06-13
2008-10-28
Huynh, Hai H (Department: 3747)
Internal-combustion engines
Spark ignition timing control
Electronic control
Reexamination Certificate
active
07441543
ABSTRACT:
An engine ECU executes a program including a step of calculating a correlation coefficient K representing a degree of agreement between a vibration waveform and a knock waveform model, a step of calculating a knock magnitude N by dividing a peak value P of magnitude in the vibration waveform by BGL, a step of determining whether knocking has occurred based on a combination of the correlation coefficient K and the knock magnitude N, in such a manner as to determine that knocking has not occurred in at least one of the case where the correlation coefficient K is smaller than a threshold value K(1) and the case where the knock magnitude N is smaller than a threshold value N(1), and a step of retarding ignition timing by a retarding amount corresponding to the combination of the correlation coefficient K and the knock magnitude N, if knocking has occurred.
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Kaneko Rihito
Kasashima Kenji
Oe Shuhei
Senda Kenji
Takemura Yuuichi
Denso Corporation
Huynh Hai H
Nippon Soken Inc.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Toyota Jidosha & Kabushiki Kaisha
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