Oxygen sensor monitoring
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United States of America Patent
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Mar 26, 2002
Grant Date -
N/A
app pub date -
Nov 30, 1998
filing date -
Nov 30, 1998
priority date (Note) -
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Abstract
A gas sensor deterioration monitor, particularly suited for use in an exhaust stream from an internal combustion engine. Under certain engine operating conditions, the output signal from the sensor is transformed through a Fourier Transformation into a frequency domain signal. Ratios of the magnitudes of certain odd and even harmonics are compared to corresponding reference values for a new sensor. Deviations beyond certain limits indicate a sensor that has deteriorated substantially.
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