LOW TEMPERATURE UREA INJECTION METHOD
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United States of America Patent
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Issued Date -
Mar 4, 2010
app pub date -
Mar 10, 2008
filing date -
Mar 22, 2007
priority date (Note) -
Abandoned
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Abstract
The invention relates to a method for injecting urea in an exhaust line of an engine (1), the urea containing ammonia which is used for chemically reducing, during a selective catalytic reduction reaction, or SCR reaction, the nitrogen oxides produced by the engine, the injection being performed upstream of a catalyst (3) in which the reaction takes place, the process comprising the following steps: the temperature in the exhaust line of the engine is measured (7); an amount of urea to be injected is determined (5), from a known relation between the temperature and the amount of urea to be injected for all possible operating temperature values; a determined urea amount is injected (6) in the engine exhaust line.
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