Engine controller

Details Engine controller Engine controller

2007-05-04

2008-08-19

Vo, Hieu T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C073S023320, C701S115000

Reexamination Certificate

active

07415343

ABSTRACT:
Respective positive terminal electric potentials of exhaust gas sensors are sequentially selectively inputted to an analog input terminal of a multi-channel AD converter through a multiplexer. An offset voltage is applied to respective negative terminals of the exhaust gas sensors. This offset voltage is inputted to another input terminal of the multi-channel AD converter. A microprocessor detects a generating voltage of the exhaust gas sensors by the difference between a digital converting value of the positive terminal electric potential and a digital converting value of the negative terminal electric potential. The microprocessor also individually judges that each of the digital converting values is excessively small and excessively large. Thus, the microprocessor judges the existence of ground, sky short circuit and disconnection abnormalities of the negative terminal and the positive terminal.

REFERENCES:
patent: 4825838 (1989-05-01), Osuga et al.
patent: 6957562 (2005-10-01), Anilovich et al.
patent: 5-107299 (1993-04-01), None
patent: 2001-173496 (2001-06-01), None
patent: 2005-171898 (2005-06-01), None

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