Air/fuel ratio detector

Details Air/fuel ratio detector Air/fuel ratio detector

1984-12-17

1988-02-02

Terapane, John F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, 422 98, G01N 2726

Patent

active

H00004278

ABSTRACT:
An air/fuel ratio detector comprising a pump and an electrochemical cell in which both the pump and electrochemical cell comprise an oxygen ion conductive solid electrolyte sandwiched between porous electrodes. One of the elements has an insulating substrate formed on a portion of the electrolyte. Over the substrate is formed a layer of semiconducting metal oxide. The cell and pump face each other with the cell providing an EMF and the pump being pumped by a pump current. The size of the resistance of the metal oxide layer indicates whether the air/fuel mixture is rich or lean relative to a stoichiometric mixture and the values of the EMF and pump current indicate the deviation from stoichiometry.

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