Knocking detection method for internal combustion engines and ignition timing control method therefor
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United States of America Patent
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Feb 4, 1997
Issued Date -
N/A
app pub date -
Apr 6, 1995
filing date -
Sep 30, 1992
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Abstract
The object of the invention is to provide an engine knocking detection method for detecting a knocking from a plurality of characteristic frequency components indicative of a knocking condition, in which false information indicating a false knock occurrence due to an abnormal drop of the background level to be compared with the characteristic components is eliminated. The engine knocking detection method of the invention includes extracting information indicating an occurrence of a knocking through comparison of the characteristic components and corresponding background levels (step 104) and comparing the background levels and corresponding lower limiters when no knocking is taking place (step 109). When any one of the background levels is smaller than a lower limiter corresponding thereto, the lower limiter is adopted and set as a new background for use in the next routine. When any one of the background levels drops abnormally, a corresponding lower limiter thereof is effected to replace the faulty background level, thereby false information indicating the occurrence of a false knocking is prevented from being generated.
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