System and apparatus for enhancing exhaust aftertreatment startup emissions control
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United States of America Patent
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Jun 16, 2015
Grant Date -
May 15, 2014
app pub date -
Jan 22, 2014
filing date -
Mar 11, 2010
priority date (Note) -
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Abstract
An aftertreatment system including a method which provides a selective catalytic reduction (SCR) catalyst disposed in an exhaust stream of an engine; determines that an ammonia pre-load condition for the SCR catalyst is present; determines a first amount of ammonia pre-load in response to the ammonia pre-load condition; injects an amount of ammonia or urea into the exhaust stream in response to the first amount of ammonia; and adsorbs a second amount of ammonia onto the SCR catalyst in response to injecting an amount of ammonia or urea, where the second amount of ammonia is either the injected amount of ammonia or an amount of ammonia resulting from hydrolysis from the injected amount of urea.
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