Air-to-fuel ratio sensor

Details Air-to-fuel ratio sensor Air-to-fuel ratio sensor

1997-07-21

2000-06-20

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, 204429, 2057845, G01N 27407

Patent

active

060774096

ABSTRACT:
An air-to-fuel (A/F) ratio sensor includes an insulation layer, two solid electrolyte layers made of a porous composite ceramic formed at both sides of the insulation layer, each solid electrolyte layer having an internal electrode layer on its boundary surface with the insulation layer and an external electrode layer on its other surface, and a diffusion barrier layer made of a porous composite ceramic, covering one of the external electrode layers. The A/F ratio sensor provides a linear A/F ratio signal by controlling only a pumping current for a reference partial pressure of oxygen. Thus, the A/F ratio sensor operates by a simpler driving principle, thereby simplifying the driving circuit thereof.

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Jong-Heun Lee, et al. Sensors and Actuators, Limiting current and wide range etc. 1996 month unavailable, pp. 278-284.

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