Device for judging deterioration of catalyst of engine
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United States of America Patent
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Apr 28, 1998
Grant Date -
N/A
app pub date -
Oct 21, 1996
filing date -
Oct 26, 1995
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Abstract
A device for judging the deterioration of a three-way catalyst comprising an upstream O.sub.2 sensor and a downstream O.sub.2 sensor which are arranged in the exhaust passage upstream and downstream of the three-way catalyst respectively. When the ratio of length of the output signal response curve of the downstream O.sub.2 sensor and the length of the output signal response curve of the upstream O.sub.2 sensor is over a threshold level, it is judged that the three-way catalyst has deteriorated. The threshold value is reduced as the mean value of the air-fuel ratio becomes off from the stoichiometric air-fuel ratio.
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