Evaluation of a motor vehicle oxygen sensor performance
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United States of America Patent
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Apr 1, 2003
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N/A
app pub date -
Jul 12, 2000
filing date -
Jul 12, 1999
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Abstract
The invention relates to the performance evaluation of an oxygen gas sensor in a motor vehicle, where the oxygen gas sensor is used to measure the oxygen content of the combusted air fuel mixture of a motor vehicle exhaust. The method involves measuring the fall time for the detected oxygen level to fall to a pre-determined lower threshold after the fuel supply to the engine has been cut off, and if the measured fall time exceeds a pre-set time, producing an oxygen sensor degradation signal.
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