Air-fuel ratio sensor

Details Air-fuel ratio sensor Air-fuel ratio sensor

1997-01-31

1999-08-10

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204425, 204427, 204428, 204429, G01N 27407

Patent

active

059353996

ABSTRACT:
An air-fuel ratio sensing element comprises a cup-shaped solid electrolyte with one end opened and the other end closed, an external electrode provided on an outer wall surface of the solid electrolyte so as to be exposed to measured gas, and an internal electrode provided on an inner wall surface of the solid electrolyte in a confronting relationship to the external electrode. A first insulating layer, made of a gas-permeable and nonconductive porous material, is provided on the external electrode at least in a region used for detecting of an air-fuel ratio. A second insulating layer is provided outside the first insulating layer and, a heater layer as provided between the first insulating layer and the second insulating layer.

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patent: 4541900 (1985-09-01), Mase et al.
patent: 4578174 (1986-03-01), Kato et al.
patent: 4636293 (1987-01-01), Bayha et al.

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