Method and system for diagnosing deterioration of NOx catalyst
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United States of America Patent
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Jan 2, 2001
Grant Date -
N/A
app pub date -
Feb 12, 1999
filing date -
Feb 12, 1998
priority date (Note) -
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Abstract
A system and method for diagnosing deterioration of a nitrogen oxide (NOx) catalyst for an internal combustion engine. An output signal indicative of concentration of nitrogen oxides (NOx) in exhaust gas passing through the NOx catalyst is generated from a NOx sensor. Rates of change in the detected NOx concentration are calculated a plurality of times over a predetermined period of time after an air/fuel ratio becomes less than a stoichiometric air/fuel ratio. A representative value derived from the calculated rates of change in the detected NOx concentration is compared with a predetermined reference value for determining that the NOx catalyst is deteriorated.
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