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Catalyst temperature model

  • US 6,295,806 B1
  • Filed: 04/05/2000
  • Issued: 10/02/2001
  • Est. Priority Date: 04/05/2000
  • Status: Expired due to Term
First Claim
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1. A method for monitoring the temperature of a catalyst in a catalytic converter in an exhaust system, the method comprising the steps of:

  • determining a first catalyst temperature;

    determining a stabilized catalyst temperature which includes the steps of determining a quantity of unfueled engine cylinders, and calculating a term to account for a quantity of air pumped through an engine without a corresponding release of combustion energy based on the quantity of unfueled engine cylinders; and

    determining an updated catalyst temperature based on the first catalyst temperature, the stabilized catalyst temperature and an update fraction.

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