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On-line catalyst monitoring using a Kalman filter

  • US 7,043,899 B2
  • Filed: 05/26/2004
  • Issued: 05/16/2006
  • Est. Priority Date: 05/26/2004
  • Status: Active Grant
First Claim
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1. A method of on-line, non-intrusive monitoring of a catalytic converter, the method comprising:

  • modeling dynamic behavior of a catalytic converter using an oxygen storage dominant model;

    identifying parameters in the model using a recursive Kalman filtering technique;

    deriving a catalyst diagnostic index using said model parameters identified by said Kalman filtering technique; and

    using the index to judge performance of the catalytic converter.

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