METHOD AND SYSTEM FOR IMPROVING DIAGNOSIS OF A CATALYST
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United States of America
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Jan 23, 2020
app pub date -
Jul 19, 2018
filing date -
Jul 19, 2018
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Abstract
Methods and systems are provided for diagnosing operation of a catalyst in the presence of oxygen sensor degradation over a vehicle life cycle. The methods and systems described herein filter the output of one oxygen sensor according to a time constant of a different oxygen sensor so that determination of a catalyst index ratio is compensated for oxygen sensor degradation.
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