Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For oxygen or oxygen containing compound
Reexamination Certificate
2008-02-20
2011-11-08
Olsen, Kaj K (Department: 1724)
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
For oxygen or oxygen containing compound
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.
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Japanese Office Action dated Dec. 9, 2008 issued in corresponding Japanese Application No. 2007-039907, with English translation.
Kawaki Yohei
Kawase Tomoo
Kurokawa Eiichi
Suzuki Toshiyuki
Denso Corporation
Nixon & Vanderhye P.C.
Olsen Kaj K
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