Device for judging deterioration of catalyst of engine
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United States of America Patent
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-
Apr 14, 1998
Grant Date -
N/A
app pub date -
Nov 29, 1996
filing date -
Dec 7, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
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 judgement of deterioration of the three-way catalyst is performed when the three-way catalyst starts to be activated. At this time, the lower the temperature of the downstream O.sub.2 sensor, the lower the threshold level is made.
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