Oxygen concentration detection apparatus

Details Oxygen concentration detection apparatus Oxygen concentration detection apparatus

1994-12-21

1996-05-21

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204410, 204425, 204426, 204427, G01N 2741, G01N 27409

Patent

active

055186009

ABSTRACT:
An oxygen concentration detection apparatus for an internal combustion engine is capable of starting feedback control of an air-fuel ratio in the shortest time possible after the engine has been started, thereby preventing the blackening of an oxygen concentration sensor 1, incorrect determination of the air-fuel ratio immediately after start of the current supply to a heating element 20, and damage to the oxygen concentration sensor 1 due to a temperature rise of the heating element 20 when the engine is cold started. A heating state of the heating element 20 of a variable resistance type, which heats the oxygen concentration sensor 1, is detected so that the current supply to an oxygen pumping device 18 is controlled in accordance with the detected state of the heating element 20.

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