Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1984-09-14
1986-11-11
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204426, 204427, 204406, G01N 2746
Patent
active
046221263
ABSTRACT:
An engine air/fuel ratio sensing device for measuring the oxygen partial pressure or concentration in the exhaust gas of an engine. The device has a sensor and a control circuit coupled to each other. The sensor consists of an electrolyte oxygen pump cell and an electrolyte oxygen sensor cell, both cells having a gap portion therebetween. The oxygen pump cell pumps oxygen into ambient gas when electrically energized. The sensor cell produces an electromotive force when there is an oxygen partial pressure difference thereacross due to the pumping of the pump cell. The control circuit has a differential amplifier which receives as an input the electromotive force for comparison with a predetermined reference voltage. The amplifier continuously provides an output, used for driving a pumping current through the pump cell, until the electromotive force reaches the reference voltage at which an equilibrium condition for the pumping current is established. The differential amplifier accomplishes this function with a series combination of a feedback resistor and a feedback capacitor.
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Engine Sensors: State of the Art (Fleming).
Oxygen Sensing by Electrochemical Pumping (Hetrick et al).
Mitsubishi Denki & Kabushiki Kaisha
Tung T.
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