Ignition timing control system for internal combustion engine
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United States of America Patent
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-
May 4, 2004
Grant Date -
Dec 11, 2003
app pub date -
Jun 10, 2003
filing date -
Jun 11, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
An ignition timing control system for an internal combustion engine includes an electronic control unit. In a transition state where an in-cylinder EGR rate varies, the unit calculates an ignition timing corresponding to the in-cylinder EGR rate by means of linear interpolation based on ignition timings for EGR and non-EGR operations determined from maps, sets a retard amount based on the ratio of the in-cylinder EGR rate to a target EGR rate, and performs ignition timing control based on a corrected ignition timing obtained by subtracting the retard amount from the calculated ignition timing, thus preventing occurrences of knocking due to excessively advanced ignition timing, and deteriorated fuel consumption and drivability.
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