Method and device for detecting an incorrectly connected...

Details Method and device for detecting an incorrectly connected... Method and device for detecting an incorrectly connected...

2006-10-18

2009-12-29

Raevis, Robert R (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Fluid pressure

C073S114760

Reexamination Certificate

active

07637140

ABSTRACT:
An incorrectly connected differential pressure sensor with a high and a low pressure connection to an exhaust gas duct in parallel with a particle filter can be detected by checking at least one predefined criterion stable operating conditions. If stable operating conditions are present, at least one uncorrected differential pressure value is determined from sensor signals of the differential pressure sensor. In a first detection, the uncorrected differential pressure value representing the stable conditions is checked whether it satisfies a first predefined error criterion. In a second detection after the end of the engine operation, a value is determined for an offset parameter of a differential pressure sensor characteristic, a corrected minimum differential pressure value is determined as a function of the determined offset parameter value and the uncorrected differential pressure value, and a check is made whether the corrected minimum differential pressure value satisfies a second predefined error criterion.

REFERENCES:
patent: 7096009 (2006-08-01), Mousseau et al.
patent: 2004/0040285 (2004-03-01), Strohmaier et al.
patent: 2004/0214558 (2004-10-01), Chang et al.
patent: 2005/0059439 (2005-03-01), White et al.
patent: 101 12 138 (2002-09-01), None
patent: 101 45 863 (2003-04-01), None

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