Failure diagnostic method and apparatus for atmospheric pressure sensors
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United States of America Patent
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Apr 10, 2007
Grant Date -
Aug 17, 2006
app pub date -
Feb 14, 2006
filing date -
Feb 15, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To identify a failed atmospheric pressure sensor in a control apparatus having two atmospheric pressure detecting systems as a failsafe. A first comparing unit outputs an abnormal signal when a difference between atmospheric pressures detected by two sensors is larger than a threshold value. An atmospheric pressure estimating unit estimates the atmospheric pressure from an engine revolution, a throttle opening, and a manifold pressure. The difference calculating unit calculates a difference between the detected atmospheric pressure and the estimated atmospheric pressure. The difference calculating unit calculates a difference between the detected atmospheric pressure and the estimated atmospheric pressure. When an abnormal signal is outputted from the first comparing unit, a second comparing unit compares the differences in response thereto. The failed atmospheric pressure sensor is identified according to which one of the differences is larger.
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