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METHOD TO MONITOR HC-SCR CATALYST NOX REDUCTION PERFORMANCE FOR LEAN EXHAUST APPLICATIONS

  • US 20100307140A1
  • Filed: 06/09/2009
  • Published: 12/09/2010
  • Est. Priority Date: 06/09/2009
  • Status: Active Grant
First Claim
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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;

    selecting an equation to estimate changes in a conversion efficiency of said selective catalytic reduction device 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.

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