초록 ▼

An apparatus for determining oxygen concentration in exhaust gases from an automotive engine is provided which includes a solid electrolytic member of oxygen ion conductive material disposed between a pair of first and second electrodes. In this apparatus, a porous insulating layer is formed on a cy

An apparatus for determining oxygen concentration in exhaust gases from an automotive engine is provided which includes a solid electrolytic member of oxygen ion conductive material disposed between a pair of first and second electrodes. In this apparatus, a porous insulating layer is formed on a cylindrical heater made of ceramics and a first electrode is formed on the outer periphery of the porous insulating layer. A solid electrolytic member is formed as a thin film form on the outer periphery of the first electrode layer and a second electrode is formed on the outer periphery of the solid electrolytic film member. Since the solid electrolytic film is formed such that it overlies the outer periphery of the cylindrical heater, it has an adequate structural strength even if formed to be a thinner film.

대표청구항 ▼

An apparatus for determining the oxygen content in gases comprising: a bar-like ceramic heater having an outer surface; a porous first insulating layer which is formed on said outer surface of said ceramic heater by plasma flame spraying and permits the passage of oxygen molecules, said porous first

An apparatus for determining the oxygen content in gases comprising: a bar-like ceramic heater having an outer surface; a porous first insulating layer which is formed on said outer surface of said ceramic heater by plasma flame spraying and permits the passage of oxygen molecules, said porous first insulating layer having an outer surface; a first electrode formed on said outer surface of said first insulating layer, said first electrode having an outer surface; a solid electrolyte film formed on said outer surface of said first electrode, said solid electrolyte film having an outer surface; a second electrode formed on said outer surface of said solid electrolyte film, said second electrode having an outer surface; a second insulating layer formed between said first and second electrodes to insulate said first and second electrodes from each other; an oxygen diffusion-resistant layer formed on said outer surface of said second electrode to permit oxygen molecules to migrate to said second electrode; and measuring means for applying a prescribed voltage between said first and second electrodes, and for measuring a current flowing therebetween in accordance with the application of said prescribed voltage.