Oxygen concentration detecting apparatus

Details Oxygen concentration detecting apparatus Oxygen concentration detecting apparatus

1995-06-07

1996-08-20

Bell, Bruce F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204408, 204425, 204427, 204401, 422 83, 422 98, G01N 2726

Patent

active

055475523

ABSTRACT:
To shorten the time during which oxygen concentration cannot be detected, the temperature of an oxygen concentration sensor is detected by negatively biasing the sensor using a bias control circuit. A microcomputer estimates a saturated current thereof at one time before the current flowing through the sensor section ends rising based on a current detected by a current detecting circuit at that time. Further, the sensor is positively biased right after the elapse of a negative bias voltage application period by the bias control circuit. The microcomputer determines the air-fuel ratio based on the current flowing through the sensor at that time. The period in which the negative bias is applied is variably set appropriately by the microcomputer in response to changes of engine temperature and intake air amount. Furthermore, to activate the sensor quickly, the temperature of the sensor section is detected and a heater is controlled based thereon.

REFERENCES:
patent: 4543176 (1985-09-01), Harada et al.
patent: 4626338 (1986-12-01), Kondo et al.
patent: 4882030 (1989-11-01), Suzuki et al.
patent: 5405521 (1995-04-01), Nakamori et al.

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