METHOD AND DEVICES EQUIPPED WITH A HIGH-PASS FILTER FOR APPRAISAL OF THE KNOCKING IN EVERY CYLINDER OF AN INTERNAL COMBUSTION ENGINE
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United States of America Patent
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Issued Date -
Mar 5, 2009
app pub date -
Jan 17, 2007
filing date -
Jan 24, 2006
priority date (Note) -
Abandoned
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Abstract
The invention relates to the field of methods and devices for evaluating the knocking inside every cylinder of an internal combustion engine by making advantageous use of the ionisation current generated during the combustion of the fuel in each cylinder of said engine. The invention develops over various phases, each of which is repeated continually for each cycle of said combustion engine and is characterised by the fact that ionisation current values are selected during determined lengths of time, and said values are entered in a high-pass filter, the values determined by said filter then being squared and the value Vd calculated, said value being the relation between the value of the sum of the squares of said values obtained by said filter and a known normalisation coefficient, thus generating the spark at the spark plug in each cylinder on the basis of said value Vd.
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