Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1987-03-09
1988-09-20
Kaplan, G. L.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204412, 204425, 338 34, G01N 2758
Patent
active
047723769
ABSTRACT:
An air/fuel ratio sensor has an oxygen sensor cell including a primary measuring element in direct contact with a gas such as exhaust gases of an automotive engine, and an oxygen pump cell formed by inner and outer electrodes and a cover of an oxygen ion conductive solid electrolyte which confines the primary measuring element within a gas diffusion control space, and which has a small gas diffusion hole. The primary measuring element is formed with a central opening whose center lies right below the gas diffusion hole, in order to reduce a burden imposed on the oxygen pump cell and prevent overshoot in a sensor response characteristic. The oxygen sensor cell may be composed of the primary measuring element of a transition metal oxide connected with a pair of electrodes for measurement of an electrical resistance of the primary element, or may be composed of an oxygen ion conductive solid electrolyte substrate sandwiched between a reference electrode and the primary measuring element which serves as a measuring electrode.
REFERENCES:
patent: 4579643 (1986-04-01), Mase et al.
Ichikawa Satoru
Kimura Shinji
Munakata Fumio
Touda Masayuki
Yukawa Fumio
Kaplan G. L.
Nissan Motor Co,. Ltd.
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