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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.
US 8,230,677 B2
Michigan Technological University, Houghton, MI (US)
Certificate of Correction
Devarakonda, Maruthi; Parker, Gordon; and Johnson, John, "NOx control systems and methods for controlling NOx emissions" (2012). Michigan Tech Patents. 116.