Failure diagnostic method and apparatus for manifold...

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant

Reexamination Certificate

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Reexamination Certificate

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11354077

ABSTRACT:
To identify a failed manifold pressure sensor in a control apparatus having two manifold pressure detection systems as a. A calculating unit calculates a difference between the manifold pressure detected by two sensors. A first comparing unit outputs an abnormal signal when the difference is larger than a threshold value. A calculating unit calculates a difference between the manifold pressure and the atmospheric pressure. A difference calculating unit calculates a difference between the manifold pressure and the atmospheric pressure. When the abnormal signal is outputted from the first comparing unit while an engine is stopped, a second comparing unit compares the differences in response thereto. Depending on which one of the differences is larger, it is determined which one of the manifold pressure sensors is abnormal.

REFERENCES:
patent: 5808189 (1998-09-01), Toyoda
patent: 7100571 (2006-09-01), Hasegawa
patent: 2006/0184309 (2006-08-01), Hasegawa
patent: 10-176582 (1998-06-01), None
patent: 2003-307152 (2003-10-01), None

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