Method and Apparatus for Estimating the Amount of Reductant Slip in a Selective Catalytic Reduction Device

摘要

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.

主权项

1. A method for estimating an amount of ammonia output from a selective catalytic reduction (SCR) device, the method comprising the steps of:
determining a NOx conversion efficiency of the SCR device from a variance of a NOx sensor measurement signal at an input of the SCR device and a variance of a NOx sensor measurement signal at an output of the SCR device; estimating an amount of NOx output from the SCR device from the NOx conversion efficiency of the SCR device and a NOx sensor measurement signal at an input to the SCR device; and estimating the amount of ammonia output from the SCR device from the estimated NOx output and the NOx sensor measurement signal at the output of the SCR device.