Abnormality diagnosis apparatus for internal combustion engine

Details Abnormality diagnosis apparatus for internal combustion engine Abnormality diagnosis apparatus for internal combustion engine

2008-08-20

2010-11-16

McCall, Eric S (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Fuel system or part thereof

C073S114480, C073S114550, C073S114720

Reexamination Certificate

active

07832260

ABSTRACT:
An abnormality diagnosis apparatus for an internal combustion engine includes an abnormality diagnosis unit, an other fuel contamination determination unit, and a misdiagnosis prohibition unit. The abnormality diagnosis unit determines whether there is an abnormality in a fuel system based on an output from an exhaust gas sensor mounted on an exhaust duct of the internal combustion engine. The other fuel contamination determination unit determines whether an other fuel contaminates a supply fuel supplied to the internal combustion engine. The misdiagnosis prohibition unit conducts one of (a) changing an abnormality determination condition for the abnormality diagnosis in the fuel system and (b) prohibiting the abnormality diagnosis in the fuel system, when the other fuel contamination determination unit determines that the other fuel contaminates the supply fuel.

REFERENCES:
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patent: 7370521 (2008-05-01), Sandmann et al.
patent: 2009/0031704 (2009-02-01), Tanaka
patent: 2009/0031987 (2009-02-01), Tanaka
patent: 11-82117 (1999-03-01), None
patent: 2001-329894 (2001-11-01), None

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