| 摘要 |
An engine ECU executes a program including the steps of: calculating a magnitude value LOG(V) by logarithmically converting a magnitude V of vibration occurring in an engine, calculating a median V( 50 ) and a standard deviation sigma of magnitude values LOG(V); and setting, to the product of the standard deviation sigma and a factor A, a first upper limit of a determination value V(KX) that is to be compared with a knock magnitude N for determining whether or not knocking has occurred, and setting a first lower limit of the determination value V(KX) to the product of the standard deviation sigma and a factor B.
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