Chemistry: electrical and wave energy – Processes and products
Patent
1985-10-04
1987-05-19
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204410, 204412, 204425, G01N 2758
Patent
active
046665668
ABSTRACT:
A method of effecting determination whether a measurement gas is a rich-burned exhaust gas or a lean-burned exhaust gas, by using an oxygen concentration sensor which includes at least one solid electrolyte member of an oxygen-ion conductive material, and at least two electrodes, one electrode being an electrode which is exposed to the measurement gas through diffusion-resistance means, the steps of: applying an electric current to the electrode exposed to the measurement gas through the diffusion-resistance means, such that the electric current flows in one of opposite directions depending upon whether the measurement gas is a rich-burned exhaust gas or a lean-burned exhaust gas, so as to maintain an atmosphere adjacent to the electrode exposed to the measurement gas through the diffusion-resistance means to be stoichiometric; and detecting one of a change in the direction of flow of the electric current, and a change in polarity of a voltage which gives the electric current, and thereby effecting the determination.
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IEEE Transactions on Electron Devices, vol. ED-29 (1982) Jan. No. 1, New York "Oscillatory-Mode Oxygen Sensor" by Robert E. Hetrick, W. A. Fate & Wm. C. Vassell.
Mizutani Yoshihiko
Shibata Kazuyoshi
Kaplan G. L.
NGK Insulators Ltd.
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