Delco Electronics Corporation

Saturn Corporation

Keith C Mitchell

William J Bolander

Michael R Witkowski

Michael Lee Velliky

Kenneth R Kridner

A vehicle engine utilizes adaptive knock retard in which non-volatile memory cells store slowly changed values based on sensed knock to retard ignition timing. Upon engine start, the values in one or more of the memory cells may be reduced in a proportional manner to provide a more advanced engine ignition timing more appropriate to engine warmup. The proportional reduction is based on the sensed engine coolant temperature at the initiation of engine operation, either by itself or through the difference between it and the stored engine coolant temperature from just before the cessation of the last period of engine operation.

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Ypsilanti, MI, United States of America

Keith C Mitchell