Apparatus for determining deterioration of three-way catalyst of internal combustion engine
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United States of America Patent
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Nov 24, 1992
Grant Date -
N/A
app pub date -
Nov 15, 1991
filing date -
Nov 20, 1990
priority date (Note) -
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Abstract
An apparatus for determining a deterioration of a condition of a three-way catalyst arranged in an exhaust passage of an internal combustion engine, comprising an upstream O.sub.2 sensor arranged in the exhaust passage upstream of the catalyst and a downstream O.sub.2 sensor arranged in the exhaust passage downstream of the catalyst. An air-fuel ratio feedback correction amount is calculated in accordance with the output of the upstream O.sub.2 sensor, and the rate of change of the air-fuel ratio feedback correction amount is decreased when it is determined that the condition of the catalyst has deteriorated.
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