Diagnostic method and control apparatus for gas sensor
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United States of America Patent
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Dec 22, 2009
Grant Date -
Aug 21, 2008
app pub date -
Feb 19, 2008
filing date -
Feb 21, 2007
priority date (Note) -
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Abstract
A gas sensor diagnostic method (or apparatus) is arranged to periodically obtain sensor output values of a gas sensor such as an oxygen sensor for an internal combustion engine, and to determine local extreme values from the sensor output values obtained during a period of interruption of fuel supply to the engine. Moreover, the local extreme values are compared with a first predetermined threshold level. When the number of the local extreme values reaches a predetermined first number, a diagnosis is performed to determine whether the gas sensor is in an improper condition or not, in accordance with results of the comparison of the local extreme values with the first threshold level.
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