On-line catalyst monitoring using a kalman filter
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 from a preselected parameter of the model; and
using the index to judge performance of the catalytic converter.
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Abstract
A method of non-intrusive monitoring of catalyst performance in an automotive exhaust system uses a model of catalytic converter operation emphasizing oxygen storage capacity dominance. Model parameters are identified using a recursive Kalman filtering technique. A catalyst diagnostic index is derived from at least one identified parameter, and the index is used to judge converter performance.
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Citations
9 Claims
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1. A method of on-line, non-intrusive monitoring of a catalytic converter, the method comprising:
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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 from a preselected parameter of the model; and
using the index to judge performance of the catalytic converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification