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Method and system for optimizing fuel and reductant consumption

  • US 9,103,248 B2
  • Filed: 01/31/2013
  • Issued: 08/11/2015
  • Est. Priority Date: 01/19/2006
  • Status: Active Grant
First Claim
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1. A system for optimizing consumption of fuel and reductant for an internal combustion engine system, the system comprising:

  • a combustion engine producing a flow of engine exhaust emissions;

    a doser configured to introduce a reducing agent into the engine exhaust emissions flow;

    a cost ratio determining module configured to determine a reductant-to-fuel cost ratio value from among plural predetermined reductant-to-fuel cost ratio values;

    at least one exhaust after-treatment device including a selective catalytic reduction (SCR) catalyst adapted to convert the engine exhaust emissions to converted exhaust emissions through a reduction process utilizing the reducing agent; and

    a mode determining module configured to determine an operating mode of the combustion engine and the after-treatment device based on both the determined reductant-to-fuel cost ratio value and a geographic position of a vehicle,wherein the exhaust emissions downstream the selective catalytic reduction (SCR) catalyst is below a target emissions level while operating in the determined operating mode.

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