Air/fuel ratio sensor

Details Air/fuel ratio sensor Air/fuel ratio sensor

1986-09-29

1988-08-23

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, G01N 2746

Patent

active

047658800

ABSTRACT:
An air/fuel ratio sensor having an unambiguous output with respect to both the fuel-rich and the fuel-lean regions and which does not require the introduction of atmospheric air. The sensor is composed of first and second elements, each having porous electrodes formed on opposite sides of an oxygen-ion-conductive electrolyte plate. The two elements are arranged to define between them a gas compartment communicating with the atmosphere to be detected via one or more diffusion limiting portions. One of the elements serves as an oxygen concentration differential electrochemical cell and the other one as an oxygen pump. An internal reference oxygen source is formed on the side of one of the elements opposite the gas compartment, and a small current is caused to flow the first element so as to transfer oxygens from the gas compartment to the oxygen source. The second element pumps oxygen into or out of the gas compartment in such a manner that the air/fuel ratio of the gas in the gas compartment is held at a predetermined value.

REFERENCES:
patent: 3691023 (1972-09-01), Ruka et al.
patent: 3700577 (1972-10-01), Grauer
patent: 4207159 (1980-06-01), Kimura et al.
patent: 4450065 (1984-05-01), Yamada et al.
patent: 4496455 (1985-01-01), Linder et al.
patent: 4502939 (1985-03-01), Holfelder et al.
patent: 4574627 (1986-03-01), Sakurai et al.

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