Failure diagnostic method and apparatus for atmospheric...

Details Failure diagnostic method and apparatus for atmospheric... Failure diagnostic method and apparatus for atmospheric...

2007-04-10

2007-04-10

Vo, Hieu T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

Reexamination Certificate

active

11353002

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.

REFERENCES:
patent: 6584960 (2003-07-01), Kishibata et al.
patent: 6-201496 (1994-07-01), None
patent: 10-176582 (1998-06-01), None
patent: 2003-307152 (2003-10-01), None

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