Exhaust gas sensor for determining A/F ratio

Details Exhaust gas sensor for determining A/F ratio Exhaust gas sensor for determining A/F ratio

1987-12-23

1989-04-25

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204412, G01N 2758

Patent

active

048245496

ABSTRACT:
An oxgen sensor for detecting a measurement gas such as exhaust gases existing in an external space, which has a sensing element having a gas-diffusion space which communicates with the external space. The gas-diffusion space has a predetermined resistance to diffusion of the measurement gas therethrough, and includes a first portion to which the measurement gas diffuses along a first diffusion path, and a second portion to which the measurement gas diffuses through the first portion along a second diffusion path which has a larger length than the first diffusion path. The sensing element has a first sensing unit for producing a first output representative of an oxygen concentration of an atmosphere in the first portion of the gas-diffusion space, a first pumping unit responsive to the first output, for controlling the oxygen concentration of the atmosphere in the first portion of the gas-diffusion space, a second sensing unit for producing a second ouput representative of an oxygen concentration of an atmosphere in the second portion of the gas-diffusion space, and a second pumping unit responsive to the second output, for for controlling the oxygen concentration of the atmosphere in the second portion of the gas-diffusion space.

REFERENCES:
patent: 4285790 (1981-08-01), Isenberg
patent: 4728411 (1988-03-01), Mase et al.

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