Gas sensor control apparatus designed to ensure accuracy of...

Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For oxygen or oxygen containing compound

Reexamination Certificate

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C204S425000, C204S406000

Reexamination Certificate

active

08052863

ABSTRACT:
The gas sensor control apparatus develops a first voltage based on a first reference voltage at a negative terminal of a gas sensor device through a resistor and a second voltage based on a second reference voltage at a positive terminal of the gas sensor device. A controller samples through the resistor a sensor current, as created upon the development of the first and second voltage for measuring the concentration of gas. When the impedance of the gas sensor device is measured, the controller alternates the first voltage across the first reference voltage. The value (i.e., a zero-point) of the voltage applied to the gas sensor device when the sensor current is zero (i.e., 0 mA) depends upon the first and second reference voltages. The zero-point is corrected by regulating the second reference voltage to match an applying voltage characteristic to the gas sensor device correctly.

REFERENCES:
patent: 4419190 (1983-12-01), Dietz et al.
patent: 2004/0195097 (2004-10-01), Suzuki et al.
patent: 2004/0217001 (2004-11-01), Hada et al.
patent: 2004/0222094 (2004-11-01), Ieda et al.
patent: 57-187646 (1982-11-01), None
patent: 2000-227364 (2000-08-01), None
patent: 2000-329739 (2000-11-01), None
patent: 2004-251891 (2004-09-01), None
Japanese Office Action dated Dec. 9, 2008 issued in corresponding Japanese Application No. 2007-039907, with English translation.

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