Method and apparatus for determining deterioration of three-way catalysts in double air-fuel ratio sensor system
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United States of America Patent
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Feb 18, 1992
Grant Date -
N/A
app pub date -
Jul 18, 1989
filing date -
Jul 20, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a double air-fuel ratio sensor system having three-way catalysts, a full O.sub.2 storage amount of the three-way catalysts is estimated and compared with a predetermined amount. When the estimated full O.sub.2 storage amount is smaller than the predetermined amount, the three-way catalysts are determined to have deteriorated.
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