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Method for monitoring the conversion capacity of a catalytic converter

  • US 5,938,715 A
  • Filed: 04/07/1998
  • Issued: 08/17/1999
  • Est. Priority Date: 04/07/1997
  • Status: Expired due to Term
First Claim
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1. A method for monitoring the conversion capacity of a catalytic converter for an internal combustion engine, which comprises:

  • measuring an inlet temperature of an exhaust gas upstream of a catalytic converter;

    measuring a first outlet temperature of the exhaust gas downstream of the catalytic converter;

    calculating a second outlet temperature from the inlet temperature according to a temperature model;

    comparing the first outlet temperature and the second outlet temperature, and assessing a conversion capacity of the catalytic converter on the basis of the comparison; and

    utilizing the second outlet temperature to determine a conversion capacity of a raw emissions catalytic converter having no catalytic coating and operating under substantially the same conditions as the catalytic converter.

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