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METHOD OF ESTIMATING CATALYST TEMPERATURE OF A MULTI-DISPLACEMENT INTERNAL COMBUSTION ENGINE

  • US 20090301060A1
  • Filed: 06/04/2008
  • Published: 12/10/2009
  • Est. Priority Date: 06/04/2008
  • Status: Active Grant
First Claim
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1. A method of estimating temperature of a catalyst associated with a cylinder bank of a multi-displacement internal combustion engine having multiple cylinder banks associated with multiple catalysts, comprising:

  • setting a temperature estimate of the catalysts associated with the multiple cylinder banks substantially equal to a base model temperature;

    determining deactivation of a cylinder bank of the multiple cylinder banks;

    identifying a catalyst cooldown correction for the catalyst associated with the deactivated cylinder bank from a catalyst cooldown model including time elapsed since deactivation of the cylinder bank; and

    applying the catalyst cooldown correction to the temperature estimate of the catalyst associated with the deactivated cylinder bank to update the temperature estimate of the catalyst.

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