Oxygen concentration detecting apparatus

Details Oxygen concentration detecting apparatus Oxygen concentration detecting apparatus

1992-11-18

1994-08-16

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Electrolytic

123704, 204425, 204426, 204427, G01N 27409, G01N 2741, F02M 2507

Patent

active

053384318

ABSTRACT:
An oxygen concentration detecting apparatus having, a pumping cell and a sensing cell, electrodes formed on both surfaces of each of the pumping and sensing cells, a related support structure forming a closed space by being connected with the pumping and sensing cells, an opening communicating between the closed space and the surrounding environment, an electromotive force detector for detecting an electromotive force generated between the electrodes of the sensing cell, a voltage source for applying a voltage between the electrodes of the pumping cell, a current detector for detecting as a signal representing the oxygen concentration a current flowing in the pumping cell when a voltage is applied between the electrodes of the pumping cell, and a controller for controlling the voltage so that the electromotive force is constant at a specified value at which value the above-mentioned current is 70% or less of the limiting current.

REFERENCES:
patent: 4272329 (1981-06-01), Hetrick et al.
patent: 4772376 (1988-09-01), Yukawa et al.
patent: 4823760 (1989-04-01), Nishida
patent: 4938861 (1990-07-01), Kurosawa et al.
patent: 4990235 (1991-02-01), Chujo
SAE 880133, Closed Loop Control Of The EGR Rate Using The Oxygen Sensor, Mar. 1988.

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