Method for error diagnosis of an ambient-pressure sensor and...

Details Method for error diagnosis of an ambient-pressure sensor and... Method for error diagnosis of an ambient-pressure sensor and...

2006-05-12

2008-12-09

Beaulieu, Yonel (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle diagnosis or maintenance indication

C701S029000

Reexamination Certificate

active

07463960

ABSTRACT:
In a method for error diagnosis of an ambient-pressure sensor and an intake-manifold pressure sensor of an internal combustion engine, a defective intake-manifold pressure sensor or a defective ambient-pressure sensor is unambiguously detected by measuring the signals of the ambient-pressure sensor and the intake-manifold pressure sensor with the internal combustion engine stopped, and comparing the ambient pressure represented by the sensor signal of the ambient-pressure sensor to the intake-manifold pressure represented by the sensor signal of the intake-manifold pressure sensor to determine a pressure difference. If the determined pressure difference is greater than a predetermined maximum value, at least one additional sensor signal is measured with the internal combustion engine running, which additional sensor signal is used for identifying the defective sensor.

REFERENCES:
patent: 5848381 (1998-12-01), Ishii et al.
patent: 5880361 (1999-03-01), Taniguchi
patent: 6208917 (2001-03-01), McKissick et al.
patent: 6687601 (2004-02-01), Bale et al.

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