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Air injection control for preheated catalysts

  • US 5,390,488 A
  • Filed: 12/27/1993
  • Issued: 02/21/1995
  • Est. Priority Date: 12/27/1993
  • Status: Expired due to Fees
First Claim
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1. A method for admitting a quantity of supplemental air to an exhaust gas path of an internal combustion engine having a supplementally heated exhaust gas treatment means for catalytically treating engine exhaust gas, comprising the steps of:

  • detecting a vehicle startup command;

    activating supplemental heating of the exhaust gas treatment means upon detecting the vehicle startup command;

    sensing temperature of the exhaust gas treatment means;

    comparing exhaust gas treatment means temperature to a predetermined temperature;

    initiating admission of supplemental air to the exhaust gas path at a commanded rate when the exhaust gas treatment means temperature exceeds the predetermined temperature; and

    enabling engine starting after initiating admission of supplemental air to the exhaust gas path.

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