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 21, 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 capable of storing a quantity of sulfur and NO.sub.x groups. The method provides use of a current sulfur concentration value (S.sub.old) and a correction of the 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 estimating a first value (NO.sub.xstored1) of the total quantity of NO.sub.x groups stored in the catalyser (11) by means of a model of NO.sub.x group production by the engine, estimating a second value (NO.sub.xstored2) of the total quantity of NO.sub.x groups stored by the catalyser by means of a model of storage of the catalyser, and determining an additive correction coefficient (D) as the difference between the first estimated value (NO.sub.xstored1) and the second estimated value (NO.sub.xstored2).
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