NOx CONTROL SYSTEMS AND METHODS FOR CONTROLLING NOx EMISSIONS
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United States of America Patent
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Issued Date -
Oct 18, 2012
app pub date -
Jun 29, 2012
filing date -
Nov 26, 2007
priority date (Note) -
Abandoned
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Abstract
An exhaust aftertreatment system comprising a selective reduction catalyst, a NOx sensor or an NH3 sensor, a urea injector, and a dosing control unit, wherein the dosing control unit calculates the rate of urea injection by estimating the concentrations of NO and NO2 in the exhaust downstream of the SCR catalyst.
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