On-line catalyst monitoring using a Kalman filter
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.
DaimlerChrysler Corporation
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Wei Anson
Wang Lee