Method and Apparatus for Estimating the Amount of Reductant Slip in a Selective Catalytic Reduction Device
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United States of America Patent
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Issued Date -
Jul 9, 2015
app pub date -
Jun 26, 2013
filing date -
Jun 26, 2012
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Abandoned
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Abstract
The present disclosure provides a method and apparatus for estimating the amount of ammonia output from an SCR device by determining a NOx conversion efficiency of the SCR device using a variance of a NOx input measurement and a variance of a NOx output measurement, obtaining an estimate of NOx output from the SCR device using the NOx conversion efficiency and using that estimate to determine an estimate of ammonia output from the SCR device.
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