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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.

Patent Number

8,230,677

Assignee

Michigan Technological University, Houghton, MI (US)

Application Number

12/324,533

Date Filed

11-26-2008

Certificate of Correction

No

Issue Date

7-31-2012

Disciplines

Engineering

NOx control systems and methods for controlling NOx emissions

Included in

Engineering Commons

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