Device for detection of air/fuel ratio from oxygen partial press

Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating

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G01N 2758

Patent

active

043046525

ABSTRACT:
A device having a probe of the oxygen concentration cell type to be disposed in a combustion gas to detect actual air/fuel ratio values of an air-fuel mixture subjected to combustion. The probe has a gas impermeable layer of a solid electrolyte such as zirconia, a porous reference electrode layer made of a catalytic material such as platinum and formed on the solid electrolyte layer, a porous gas-diffusion layer covering the reference electrode layer and a porous and noncatalytic measurement electrode layer formed on the solid electrolyte layer so as to be spaced from the reference electrode layer. A DC power supply is connected to the probe to force a constant current of an adequate intensity to flow through the solid electrolyte layer between the two electrode layers. Depending on the direction of the current flow, an output voltage of this device becomes indicative of air/fuel ratio values above or below the stoichiometric air/fuel ratio.

REFERENCES:
patent: 3719564 (1973-03-01), Lilly et al.
patent: 3738341 (1973-06-01), Loos
patent: 4005001 (1977-01-01), Pebler
patent: 4207159 (1980-06-01), Kimura et al.
patent: 4224113 (1980-09-01), Kimura et al.

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