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DOSING AGENT INJECTION CONTROL FOR SELECTIVE CATALYTIC REDUCTION CATALYSTS

  • US 20100028230A1
  • Filed: 04/03/2009
  • Published: 02/04/2010
  • Est. Priority Date: 07/30/2008
  • Status: Active Grant
First Claim
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1. A dosing control system comprising:

  • a selective catalytic reduction (SCR) analysis module that estimates ammonia (NH3) stored by an SCR catalyst, maximum NH3 storage capacity of said SCR catalyst, NH3 slip downstream of said SCR catalyst, NH3 oxidation, and NH3 conversion through reaction with nitrogen oxides (NOx), wherein said NH3 stored is estimated based an amount of dosing agent injected, said NH3 slip, said NH3 oxidation, and said NH3 conversion; and

    a dosing management module that controls dosing agent injection into an exhaust system upstream of said SCR catalyst based on said NH3 stored by said SCR catalyst and said maximum NH3 storage capacity.

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