Wide range air/fuel ratio sensor having one electrochemical cell

Details Wide range air/fuel ratio sensor having one electrochemical cell Wide range air/fuel ratio sensor having one electrochemical cell

1997-12-01

1999-12-28

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204402, 204425, 204427, 204429, G01N 27407

Patent

active

060076887

ABSTRACT:
There are proposed an air/fuel ratio sensor which can detect a wide range of an air/fuel ratio and provides a simple structure, a superior mechanical strength or durability and a reduced manufacture cost, and a method of detecting the air/fuel ratio using the air/fuel ratio sensor. An air/fuel ratio sensor 1 is formed of a detecting portion 2 and a heater portion 3 laminated via a porous body 16. In the detecting portion 2, on an inner face of a plate-like solid electrolytic body 5, a reference electrode 7 is provided for controlling an oxygen gas diffusion rate, and on an outer face of the solid electrolytic body 5, a measurement electrode 6 is provided. A surface of the measurement electrode 6, on which the diffusion rate is not controlled, is covered with a protective layer 14 having an ventilation property to a degree to which the diffusion rate is not substantially controlled. A lead portion 7b of the reference electrode 7 is a porous layer which substantially controls the diffusion rate. The lead portion 7b is exposed to an exhaust gas via a connecting hole 13 which connects the lead potion 7b and the protective layer 14.

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