Air-fuel ratio sensor used to control an internal combustion...

Details Air-fuel ratio sensor used to control an internal combustion... Air-fuel ratio sensor used to control an internal combustion...

G - Physics

08

B

340/147

G08B 1/08 (2006.01) G01N 27/406 (2006.01)

Patent

CA 1248198

ABSTRACT OF THE DISCLOSURE An air-fuel ratio sensor installed in exhaust gas emitted by an internal combustion engine for detect- ing from the exhaust composition the air-fuel ratio in the engine becoming equal to a stoichiometric air-fuel ratio. The sensor comprises a solid electrolytic layer of zirconia, a pair of electrodes formed on both sides of the electrolytic layer, and a cover provided over the electrolytic layer to enclose one of the electrodes, with a diffusion room formed between the cover and the electrolytic layer and with a gas diffusion hole formed to communicate the diffusion room with the outside of the sensor. The electrode in the diffusion room works as a positive electrode, while another electrode works as a negative electrode to conduct a current between these electrodes so as to control the oxygen concentration in the diffusion room as a reference oxygen concentration. The fact that the air-fuel ratio has become equal to the stoichiometric air-fuel ratio is detected from a voltage appearing between the electrodes.

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