LEARNING METHOD OF LEARNING VALUE FOR JUDGING KNOCK INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To prevent generation of error learning caused by a high learning frequency by learning a signal level of an ion signal in which a knock signal is not superposed, and updating the learning value, in the case where it is judged that the learning value for detecting generation of knock and which is learnt beforehand and preserved is an abnormal condition. ;SOLUTION: In the case where a learning value for judging knock is learnt, in an electronic control device 6, an A/D converting value of a knock signal from iron current detected by an ion current measuring circuit 25 is set as a signal level NIONKNK. A coefficient is multiplied by a learning value memorized in a learning zone, and it is judged that the knock signal is a signal level which is not superposed or not. In the case where it is judged that the knock signal is not superposed, when a fluctuating ratio of the knock signal is lower than a prescribed ratio and an abnormal condition of the learning value is judged, a present obtained signal level NIONKNK is learnt as a learning value of a back ground level and the learning value is reserved in a memory device 8.;COPYRIGHT: (C)2000,JPO