Air/fuel ratio sensor having resistor for limiting leak current

Details Air/fuel ratio sensor having resistor for limiting leak current Air/fuel ratio sensor having resistor for limiting leak current

1990-11-26

1993-08-17

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204410, 204425, 204426, 204431, 204432, G01N 2746

Patent

active

052365697

ABSTRACT:
An air/fuel ratio sensor with a sensing element having an electrochemical oxygen pumping cell including a first oxygen ion-conductive solid electrolyte body, and a first and a second electrode formed on the first solid electrolyte body, an electrochemical oxygen sensing cell including a second oxygen ion-conductive solid electrolyte body, and a third and a fourth electrode formed on the second solid electrolyte body, the second and third electrodes being exposed to exhaust gases which are produced as a result of combustion of an air-fuel mixture and which are introduced into the sensing element, under a predetermined diffusion resistance. One of the first and second electrodes is connected to a reference conductor having a reference potential for permitting a pump current to flow through the oxygen pumping cell, while the third electrode is connected to the reference conductor via an electrical resistor so that an amount of a leak current which leaks from the oxygen pumping cell to the oxygen sensing cell is determined by an electrical resistance value of the electrical resistor.

REFERENCES:
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patent: 4818362 (1989-04-01), Asakura et al.
patent: 4897174 (1990-01-01), Wang et al.
patent: 4990235 (1991-02-01), Chujo
patent: 5028309 (1991-07-01), Nishizawa et al.
patent: 5032248 (1991-07-01), Kanamaru et al.
patent: 5080765 (1992-01-01), Wang et al.

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