Air-fuel ratio sensing element

Details Air-fuel ratio sensing element Air-fuel ratio sensing element

1996-11-14

1998-09-22

Dombroske, George M.

Measuring and testing

Gas analysis

Gas of combustion

73 3105, 701109, G01M 1500

Patent

active

058116605

ABSTRACT:
An air-fuel ratio sensing element comprises a pump cell having at least one pair of pump electrodes thereon, a sensor cell having at least one pair of sensor electrodes thereon, and a gas chamber having two surfaces defined by the pump cell and the sensor cell. Two to five gas holes, each having approximately the same diameter and communicating with the gas chamber, are provided for introducing sensed gas into the gas chamber. The gas holes form their projection images on the surface of the sensor cell which has a sensor electrode thereon and faces the gas chamber. The sensor electrode is shaped such that it is dividable into a plurality of similar subsections defined by virtual lines connecting the geometric centroid of the sensor electrode and the center of the projection image of each gas hole.

REFERENCES:
patent: 4298573 (1981-11-01), Fujishiro
patent: 4772376 (1988-09-01), Yukawa et al.
patent: 5591321 (1997-01-01), Pyke

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