Apparatus for detecting failure of exhaust gas sensor...

Details Apparatus for detecting failure of exhaust gas sensor... Apparatus for detecting failure of exhaust gas sensor...

2005-08-30

2005-08-30

Garber, Charles (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Gas or liquid analyzer

C123S690000

Reexamination Certificate

active

06935155

ABSTRACT:
An apparatus for detecting a failure of an exhaust gas sensor disposed in an exhaust manifold is provided. The apparatus comprises a control unit. The control unit compares detection values of the exhaust gas sensor detected under different element temperatures of the exhaust gas sensor. The control unit detects a failure of the exhaust gas sensor based on the comparison result. In one embodiment, the different states include a state in which the element temperature is maintained at higher level and a state in which the element temperature is maintained at lower level. The element temperature can be controlled by a response assignment control scheme. In one embodiment, the detection values are subjected to a filtering process and/or a statistical process using a successive least squares method. The control unit compares the statistically processed detection values to detect a failure of the exhaust gas sensor.

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Definition of “Percentage” from The American Heritage® Dictionary of the English Language, Third Edition copyright © 1992 by Houghton Mifflin Company.

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