Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1994-08-31
1995-05-30
Niebling, John
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204426, 204429, G01N 2726
Patent
active
054198283
ABSTRACT:
An air fuel ratio detecting apparatus by which a stable oxygen ion limit current may be obtained, including a working electrode and a gas diffusion resistance layer laminated in this order on a first surface of a solid electrolyte. An ambient air introduction duct and an electric heater are laminated in this order on a second surface of the electrolyte. The gas diffusion resistance layer is composed of a gas permeation layer and gas shield layer, which is provided on a surface of the gas diffusion resistance layer. Since the surface of the gas permeation layer is covered by the gas shield layer, the gas to be measured enters into the gas diffusion resistance layer from only side faces of gas diffusion resistance layer. A cell is preferably baked in a one-piece manner. A porosity of the gas permeation layer is in a preferable range of from about 2 to about 60%, a thickness of the gas permeation layer is preferably in a range of from about 5 to about 300 .mu.m, and a porosity of the gas shield layer is preferably no more than 10%. Also, the periphery of the cell is preferably covered by a protective layer.
REFERENCES:
patent: 4282080 (1981-08-01), Muller et al.
patent: 4356065 (1982-10-01), Dietz
patent: 5169513 (1992-12-01), Mase et al.
patent: 5288389 (1994-02-01), Yamada et al.
Fukaya Tomoji
Nakano Syuichi
Sugiyama Tomio
Suzuki Masatoshi
Bell Bruce F.
Niebling John
Nippondenso Co. Ltd.
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