System for detecting deterioration of exhaust gas purifying catalyst for automobile engine
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United States of America Patent
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-
Nov 9, 1999
Grant Date -
N/A
app pub date -
Jul 7, 1997
filing date -
Jul 5, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A diagnosis of deterioration and/or normality of an exhaust gas purifying catalyst is made by comparing a ratio of reversal frequencies of outputs from oxygen sensors disposed on opposite sides of the exhaust gas purifying catalyst with a threshold ratio. Discrimination is performed on both normality and deterioration in a standard gas quantity zone, on only normality in a large gas quantity zone, and on only deterioration in a small gas quantity zone, and nothing is made in an extra large gas quantity zone.
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