Gas sensor and method for controlling gas sensor

Details Gas sensor and method for controlling gas sensor Gas sensor and method for controlling gas sensor

1998-02-26

2000-01-04

Warden, Sr., Robert J.

Electrolysis: processes, compositions used therein, and methods

Electrolytic analysis or testing

For oxygen or oxygen containing compound

205781, 204425, 204426, G01F 164, G01N 1700, G01N 2726

Patent

active

060106158

ABSTRACT:
Disclosed is a method for controlling a gas sensor comprising the steps of pumping-processing oxygen contained in a measurement gas introduced from external space into a first chamber by using a main pumping cell so that a partial pressure of oxygen in the first chamber is controlled to have a predetermined value at which a predetermined gas component as a measurement objective is not decomposable; decomposing the predetermined gas component contained in the measurement gas in a second chamber by the aid of a catalytic action and/or electrolysis by using a detecting pumping cell to pumping-process oxygen produced during the decomposition; and measuring the predetermined gas component contained in the measurement gas on the basis of a pumping current which flows during the pumping process; wherein the oxygen to be pumped out by the detecting pumping cell is pumped out toward an inner pumping electrode which is fixed to have a base electric potential (ground electric potential), of the main pumping cell. Accordingly, it is possible to facilitate miniaturization of a control circuit system of the gas sensor and reduction of the weight thereof.

REFERENCES:
patent: 4645572 (1987-02-01), Nishizawa et al.
patent: 5145566 (1992-09-01), Logothetis et al.
patent: 5217588 (1993-06-01), Wang et al.
patent: 5763763 (1998-06-01), Kato et al.
patent: 5879525 (1999-03-01), Kato
Kato et al., Thick Film Zr02 NOx Sensors, SAE Technical Paper Series, paper 960334, (Month unknown) 1996.

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