Air/fuel ratio sensor

Details Air/fuel ratio sensor Air/fuel ratio sensor

1987-12-21

1989-05-23

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204421, 204424, 204426, G01N 2746

Patent

active

048328189

ABSTRACT:
An air/fuel ratio sensor to be used for controlling the ratio between the air and fuel through the detection of the air and the fuel in the exhaust gas of gas and oil combustion appliances, automobile engines or the like. The air/fuel ratio sensor has a first electrode on one face having porous zirconia electrolytic plate of through-holes, a second electrode containing at least electron -O.sup.2- ion mixed conductor on the other face. The controlling of the air/fuel ratio from the excessive fuel to the excessive air may be performed with a high S/N ratio under conditions ranging from excessive fuel to excessive air, through the measurement of the changes in the electric resistance of the second electrode by the third electrode provided on the second electrode. The sensor is simple in construction and is small and thin.

REFERENCES:
patent: Re28792 (1976-04-01), Ruka et al.
patent: 3922204 (1975-11-01), Tseung et al.
patent: 4345985 (1982-08-01), Tohda et al.
patent: 4374468 (1983-02-01), Takeshita et al.
patent: 4487680 (1984-12-01), Logothetis et al.
patent: 4601883 (1986-07-01), Sekido et al.
patent: 4692429 (1985-04-01), Sekido et al.

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