Limit current type oxygen concentration detection having oxygen

Details Limit current type oxygen concentration detection having oxygen Limit current type oxygen concentration detection having oxygen

1998-04-22

2000-08-01

Warden, Sr., Robert J.

Electrolysis: processes, compositions used therein, and methods

Electrolytic analysis or testing

For oxygen or oxygen containing compound

204408, 204426, 204427, 204428, G01N 2741

Patent

active

060961872

ABSTRACT:
A detecting unit of an oxygen sensor as an A/F sensor has a solid electrolyte layer and a diffusion resistance layer and generates a current value according to the concentration of oxygen in an exhaust gas by applying a voltage across electrodes on an exhaust gas side and an atmosphere side of the solid electrolyte layer. An oxygen supply/exhaust unit has a solid electrolyte layer and a pair of electrodes formed on both faces of the solid electrolyte layer, and supplies oxygen near to the electrode on the atmosphere side of the detecting unit or exhausts oxygen near the electrode. A control unit controls, in response to a limit current value detected by a current detection unit, the amount of supply or exhaust of oxygen of the oxygen supply/exhaust unit on the basis of the detected current value. A control target value of a current flowing in the solid electrolyte layer is variably set so that amount of oxygen moving in the solid electrolyte layers are equal, thereby controlling the amount of supply or exhaust of oxygen of the oxygen supply/exhaust unit.

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