| 摘要 |
A device for detecting the knocking of an internal combustion engine maintaining a favorable knock-detecting state even when a noise component having a small amplitude and lasting long is superposed on an ionic current detection signal. The device comprises a means 1 for detecting the ionic current i that flows through a spark plug 8, a filter 2 means for picking up knock signals Ki from the ionic current, a means 22 for judging the knocking state based on the knock signals, a means 11 for operating a first integrated value Km1 of the knock signals, a means 21 for setting a basic threshold value TH based on the first integrated value, a means 12 for operating a second integrated value Km2 by integrating only those knock signals having amplitudes larger than a lower-limit level among the knock signals, and a means 32 for setting the basic threshold value as the lower-limit level, wherein the occurrence of knocking is judged based on the second integrated value.
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