Air/fuel ratio detector

Details Air/fuel ratio detector Air/fuel ratio detector

1984-12-13

1986-05-27

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204410, 204412, 204425, 204426, 204427, G01N 2758

Patent

active

045914214

ABSTRACT:
An A/F (Air Fuel) ratio detector providing precise control of the operating A/F ratio of an internal combustion engine whether the engine is operating in the fuel-rich or fuel-lean region or at the theoretical (stoichiometric) point. The detector includes both a pump element and a sensor element, each composed of an oxygen-ion-conductive solid electrolyte having formed on both sides thereof a porous electrode. The pump and sensor elements are disposed facing one another with a small gap therebetween. A wall is disposed parallel to the sensor element on the side opposite the gap and is sealed to the solid electrolyte of the sensor element except at a base portion, thereby defining an air compartment open to the atmosphere. An electric current is passed through the pump element, and the resulting potential produced across the sensor element is taken as an indication of the operating A/F ratio.

REFERENCES:
patent: 4158166 (1979-06-01), Isenberg
patent: 4450065 (1984-05-01), Yamada et al.

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