| 摘要 |
An ion current detection apparatus for detecting an ion current caused by combustion in a cylinder of an internal combustion engine comprises an ion current detection circuit for detecting the ion current, a gain adjustment circuit for controlling to keep the magnitude of low frequency components of the detected ion current at a constant value, an amplifier for amplifying high frequency components of the detected ion current and outputting a high frequency component detection signal, a magnitude detection circuit for detecting the magnitude of the detected ion current to output an ion current detection signal when the detected magnitude is larger than a predetermined value, and a comparator for comparing the high frequency component detection signal with the ion current detection signal delayed by a delay circuit to output a knocking detection signal.
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