Oxygen sensing device having means for control of current to pro

Details Oxygen sensing device having means for control of current to pro Oxygen sensing device having means for control of current to pro

1981-02-26

1982-12-28

Tung, T.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

204 1T, G01N 2746

Patent

active

043660398

ABSTRACT:
Disclosed is a device useful for detection of air/fuel ratio of an air-fuel mixture subjected to combustion in a combustor by sensing oxygen in the exhaust gas, using a solid electrolyte concentration cell type oxygen-sensitive element which requires supply of a DC current to flow through its solid electrolyte layer between reference and measurement electrode layers to establish a reference oxygen partial pressure at the interface between the reference electrode and the solid electrolyte. The device comprises a control circuit to vary the intensity of the current for the oxygen-sensitive element in dependence on the magnitude of output voltage of the oxygen-sensitive element at least when a predetermined one of said output voltage and a reference voltage is higher than the other in order to compensate variations of the magnitude of the reference oxygen partial pressure caused mainly by variations of the temperature.

REFERENCES:
patent: 3129154 (1964-04-01), Pry
patent: 3208925 (1965-09-01), Hutchison et al.
patent: 4112893 (1978-09-01), Anzai
patent: 4167163 (1979-09-01), Moder
patent: 4178793 (1979-12-01), Bremer et al.
patent: 4207159 (1980-06-01), Kimura et al.

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