Exhaust gas recirculation sensor

Details Exhaust gas recirculation sensor Exhaust gas recirculation sensor

1987-05-29

1991-09-17

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, G01N 2741

Patent

active

050492543

ABSTRACT:
An electrochemical device and method measures the percentage of exhaust gas for circulation in a combined intake air and exhaust gas mixture of an internal combustion engine. Two electrochemical pump cells and a support structure form a restricted volume in communication through an aperture to an ambient of intake air and exhaust gas mixture. Constant voltage is applied across a first pump cell to cause oxygen molecules inside the volume to be pumped out. A constant voltage across the second pump cell causes dissociation of all CO.sub.2 and H.sub.2 O molecules inside the volume. Current flowing in the second pump cell is measured, the current being proportional to the percentage of CO.sub.2 plus H.sub.2 O inside the volume and also proportional to the percentage of CO.sub.2 plus H.sub.2 O in the combined intake air and exhaust gas mixture.

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"Basic Electrical Engineering", Fitzgerald et al, 2nd ed., 1957, p. 25.

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