Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2007-10-23
2007-10-23
Cronin, Stephen K. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C701S109000, C123S688000, C073S023320, C204S401000
Reexamination Certificate
active
11480538
ABSTRACT:
A deterioration detecting apparatus for an exhaust gas sensor of an internal combustion engine, the exhaust gas sensor including a sensor element and a heater that heats the sensor element, computes a first sensor characteristic parameter, which is related to a characteristic of the sensor element, by estimating an interchange state of thermal energy between the sensor element and a periphery of the sensor element. The deterioration detecting apparatus senses impedance of the sensor element. The deterioration detecting apparatus computes a second sensor characteristic parameter, which is related to the characteristic of the sensor element, based on the sensed impedance. The deterioration detecting apparatus determines a degree of deterioration of the exhaust gas sensor by comparing the first sensor characteristic parameter and the second sensor characteristic parameter.
REFERENCES:
patent: 6034610 (2000-03-01), Schnaibel et al.
patent: 2004/0000493 (2004-01-01), Yasui et al.
patent: 2004/0089060 (2004-05-01), Suzuki
patent: 2006/0047468 (2006-03-01), Aoki
Gotoh Yoshiyuki
Iida Hisashi
Tashiro Hiroshi
Cronin Stephen K.
Denso Corporation
Hoang Johnny H.
Nixon & Vanderhye P.C.
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