FUEL VOLATILITY RECOGNITION METHOD DURING THE POST-CRANKING STEP OF AN INTERNAL COMBUSTION ENGINE
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United States of America Patent
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Issued Date -
Apr 30, 2009
app pub date -
Sep 15, 2008
filing date -
Sep 13, 2007
priority date (Note) -
Abandoned
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Abstract
A fuel volatility recognition method during the post-cranking step of an internal combustion engine; the recognition method contemplates the steps of: starting the internal combustion engine; adjusting the enrichment of the mixture burnt in the cylinders of the internal combustion engine according to a previously determined historic fuel volatility value; detecting the time evolution of the angular speed of a crankshaft of the internal combustion engine during the post-cranking step; determining the noise contained in the angular speed of the crankshaft by filtering the angular speed itself by means of a high-pass filter; comparing the noise contained in the angular speed of the crankshaft against at least one predetermined threshold value; and recognizing the fuel volatility according to the result of the comparison between the noise contained in the angular speed of the crankshaft and the predetermined recognition threshold.
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