Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle diagnosis or maintenance indication
Reexamination Certificate
2008-02-19
2009-12-22
Rogers, David A. (Department: 2856)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle diagnosis or maintenance indication
C073S001060, C073S023310, C073S023320, C701S029000, C701S035000, C340S514000, C340S632000
Reexamination Certificate
active
07636624
ABSTRACT:
A gas sensor diagnostic method (or apparatus) is arranged to periodically obtain sensor output values of a gas sensor such as an oxygen sensor for an internal combustion engine, and to determine local extreme values from the sensor output values obtained during a period of interruption of fuel supply to the engine. Moreover, the local extreme values are compared with a first predetermined threshold level. When the number of the local extreme values reaches a predetermined first number, a diagnosis is performed to determine whether the gas sensor is in an improper condition or not, in accordance with results of the comparison of the local extreme values with the first threshold level.
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Fukagai Reina
Hirata Masaki
Ieda Norikazu
Inagaki Hiroshi
Suzuki Takahiro
Flynn ,Thiel, Boutell & Tanis, P.C.
NGK Spark Plug Co. Ltd.
Rogers David A.
Suzuki Motor Corporation
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