Gas sensor for measuring air-fuel ratio and method of manufactur

Chemistry: electrical and wave energy – Apparatus – Electrolytic

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20415318, 204425, 204426, 264 61, 264 62, 419 1, 419 8, 419 9, 419 10, 419 19, 419 46, 427123, 427124, 427125, 4271263, G01N 27407

Patent

active

050322486

ABSTRACT:
The invention relates to a gas sensor for measuring an air-fuel ratio of an air-fuel mixture of an internal combustion engine and to a method of manufacturing the gas sensor. The sensor of the invention comprises: a solid state electrolyte layer made of an oxygen ion conductive metal oxide; a first electrode of a porous thin film having the catalyst function which was coated on one surface of the solid state electrolyte layer; a second electrode of a porous thin film having the catalyst function which was coated on the other surface of the solid state electrolyte layer; an electrode shielding layer made of a sintered material of ultra fine particulates whose average grain diameter is 1 .mu.m or less which covers the surface other than the region of a predetermined area of the second electrode; and a gas diffusion layer made of a porous electric insulative metal oxide which covers the region of the predetermined area of at least the second electrode.

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patent: 4121988 (1978-10-01), Sano et al.
patent: 4164462 (1979-08-01), Ichikawa et al.
patent: 4177112 (1979-12-01), Suzuki et al.
patent: 4383906 (1983-05-01), Sano et al.
patent: 4402820 (1983-09-01), Sano et al.
patent: 4626337 (1986-12-01), Hotta et al.

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