Failure determination system and method for temperature...

Thermal measuring and testing – Temperature measurement – Combined with diverse art device

Reexamination Certificate

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C374S001000, C702S099000, C702S104000, C701S034000

Reexamination Certificate

active

07429128

ABSTRACT:
A failure determination system for determining failures of temperature sensors, which is capable of easily and accurately determining failures of the sensors in actual operating temperature ranges thereof, even when the ranges are different from each other. Temperatures detected by exhaust gas temperature sensors are stored as initial temperatures when the engine has stopped. Temperatures detected by the respective sensors after stoppage of the engine are made dimensionless based on the corresponding initial temperatures to thereby calculate dimensionless values. An estimated dimensionless value of a temperature to be detected when each sensor is normal is set in advance as an estimated normal value. Failures of the sensors are determined based on results of comparisons of the dimensionless values with the estimated normal value.

REFERENCES:
patent: 6684154 (2004-01-01), Isobe et al.
patent: 7147366 (2006-12-01), Melby et al.
patent: 7275425 (2007-10-01), Buck et al.
patent: 2005/0102076 (2005-05-01), Kariya et al.
patent: 2006/0052931 (2006-03-01), Shikama et al.
patent: 2007/0045112 (2007-03-01), Tashiro
patent: 2006-057455 (2006-03-01), None
Japanese Office Action, issued on Jan. 29, 2008, for corresponding Japanese Application No. 2005-245064.

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