| 摘要 |
A knock control apparatus normalizes a knock frequency magnitude and a background noise level to substantially the same levels in all the engine operating conditions in consideration of a variation in an ionic current level due to an environment, the number of revolutions per minute of the engine, an engine load, etc. A frequency magnitude calculation part includes a frequency magnitude detector for detecting the magnitude of a specific frequency based on an output of an ionic current detector, an ionic current area calculator for calculating an ionic current area in a prescribed range during the combustion stroke of a cylinder concerned based on the output of the ionic current detector, a corrector for correcting the detected specific frequency magnitude based on the calculated ionic current area, a knock determiner for determining based on the corrected specific frequency magnitude whether the engine is knocking, and a control parameter correction amount setter for setting an amount of correction for an ignition timing control parameter based on the determination result.
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