Method for estimating the sulfur content in the fuel of an internal combustion engine
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United States of America Patent
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Apr 7, 2009
Grant Date -
Nov 16, 2006
app pub date -
Jul 21, 2006
filing date -
Dec 14, 2001
priority date (Note) -
Expired
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Abstract
A method for estimating the sulfur content in the fuel of an internal combustion engine equipped with a catalyser, using a current sulfur concentration value (S.sub.old) and a correction of said current sulfur concentration value (S.sub.old) in order to obtain a new sulfur concentration value (S.sub.new). The method includes the steps of measuring a first time interval (t.sub.1-t.sub.0) which is actually necessary in order to complete a regeneration process to remove sulfur; determining a quantity (SO.sub.xstored) of sulfur stored in the catalyser before the regeneration process to remove sulfur using the current sulfur concentration value (S.sub.old); estimating a second time interval (t.sub.2-t.sub.0) which is theoretically necessary to complete the regeneration process, on the basis of the estimated quantity (SO.sub.xstored) of sulfur stored in the catalyser; and determining a multiplicative correction coefficient as a ratio between the first time interval (t.sub.1-t.sub.0) and the second time interval (t.sub.2-t.sub.0).
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