Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2005-04-19
2005-04-19
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
C073S023310, C204S401000, C204S424000
Reexamination Certificate
active
06882927
ABSTRACT:
A failure diagnostic apparatus for a gas concentration detecting apparatus is provided, which can early detect disconnection in a cell included in the gas concentration detecting apparatus. The gas concentration detecting apparatus is provided, which includes cells each of which pumps out oxygen in a gas detection chamber, thereby generating an electric current corresponding to the concentration of oxygen in the gas detection chamber. A heater which heats each of the cells to an activation temperature is provided. A period during which a predetermined electric current should flow in the cell after the heater starts heating is detected. A determination on whether there is disconnection is made based on whether each of electric currents flowing in the cells is appropriate.
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Oliff & Berridg,e PLC
Toyota Jidosha & Kabushiki Kaisha
Vo Hieu T.
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