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Systems and methods for estimating particulate load in a particulate filter

  • US 8,161,738 B2
  • Filed: 11/26/2008
  • Issued: 04/24/2012
  • Est. Priority Date: 11/26/2008
  • Status: Active Grant
First Claim
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1. A method for regenerating a particulate filter, comprising:

  • determining a temperature, a flow rate, and a total pressure drop of an exhaust gas flowing through a particulate filter,wherein the total pressure drop of the exhaust gas is determined by determining inlet contraction losses, outlet expansion losses, inlet channel losses, outlet channel losses and permeable layer losses of the exhaust gas through the particulate filter, and wherein at least one of the losses is determined based on the determined temperature;

    determining an Euler number and a Reynolds number corresponding to the fluid flowing through the particulate filter;

    determining a corrected soot layer permeability based on the temperature;

    calculating an estimated soot load of the particulate filter based on the total pressure drop and the corrected soot layer permeability, wherein calculating the estimated soot load comprises;

    determining a Stokes-Cunningham correction factor to the soot layer permeability, andcalculating the product of the Euler number, the Reynolds number, and the Stokes-Cunningham correction factor to the soot layer permeability; and

    causing regeneration of the particulate filter when the estimated soot load is greater than or equal to a threshold value.

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