Systems, methods, and apparatus for reductant dosing in an SCR aftertreatment system
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United States of America Patent
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Jan 5, 2015
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Mar 3, 2014
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Abstract
Systems, methods and apparatus disclosed that include an internal combustion engine and an exhaust system that includes an exhaust aftertreatment system with an SCR catalyst. A NOx sensor downstream of the SCR catalyst is provided along with techniques for estimating an amount of NOx and NH3 at the tailpipe to decouple the impact of cross-sensitivity of the NOx sensor to NOx and NH3. Feedback control of the reductant dosing amount based on these estimates is also provided.
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