Patent ID: 8186151
Filing Date: 2012-05-29
Classification: F01N,Y02T

Abstract:
1. Method for initiating a regeneration mode in a selective catalytic reduction device of an aftertreatment system utilizing hydrocarbons as a reductant, comprising: monitoring a temperature within said aftertreatment system; monitoring a fuel dosing rate to said selective catalytic reduction device; monitoring an initial conversion efficiency; creating a plurality of determined equations by fitting a curve to test data to estimate changes in a conversion efficiency of said selective catalytic reduction device over time, each determined equation defined for a respective temperature range; selecting one of the plurality of determined equations based upon said monitored temperature and said monitored fuel dosing rate; estimating changes in said conversion efficiency based upon said equation and said initial conversion efficiency; and initiating a regeneration mode for said selective catalytic reduction device based upon said estimated changes in conversion efficiency.