Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1984-12-13
1986-03-25
Kaplan, G. L.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
60276, 123489, 204406, 204425, 204426, 338 34, G01N 2758
Patent
active
045781729
ABSTRACT:
An air/fuel ratio detector capable of producing an unambiguous output for both fuel-rich and fuel-lean regions. A solid-electrolyte oxygen-concentration-difference-actuated electrochemical cell sensor element is provided having a porous electrode formed on both sides of an oxygen-ion-conductive solid electrolyte. A solid-electrolyte oxygen pump element is also provided with a porous electrode formed on both sides of an oxygen-ion-conductive solid electrolyte. An oxygen reference element has a metal oxide semiconductor layer formed on one side of a substrate made of an air-impermeable member. The electrochemical cell sensor element and the pump element are disposed facing one another with a small gap therebetween. An air compartment open to the atmosphere is formed between that side of the pump element opposite the side facing the small gap and the side of the reference element opposite the side having the metal oxide semiconductor layer. The air/fuel ratio is detected both by a change in the electrical properties of the oxygen reference element and by output signal provided by at least one of the electromotive force of the electrochemical cell sensor element and a pump current flowing through the pump element.
REFERENCES:
patent: 4187486 (1980-02-01), Takahasi et al.
patent: 4224113 (1980-09-01), Kimura et al.
patent: 4264425 (1981-04-01), Kimura et al.
patent: 4298573 (1981-11-01), Fujishiro
patent: 4450065 (1984-05-01), Yamada et al.
Hirate Shintaro
Yamada Tetsusyo
Kaplan G. L.
Mitsubishi Denki K.K.
NGK Spark Plug Co.
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