Diagnostic system for monitoring catalyst performance
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United States of America Patent
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Oct 12, 2004
Grant Date -
Feb 13, 2003
app pub date -
Aug 10, 2001
filing date -
Aug 10, 2001
priority date (Note) -
Expired
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Abstract
A diagnostic system for monitoring catalyst performance in an exhaust system comprises a plurality of treatment devices catalytically treating an exhaust gas stream, and a plurality of gas sensors for monitoring the catalyst performance of the treatment devices to determine when sulfur poisoning occurs. An on-board diagnostic system receives signals from the gas sensors, and, based upon response time differentials between sensors, determines whether the treatment devices are experiencing sulfur poisoning.
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