Oxygen concentration detection with sensor current limitation

Details Oxygen concentration detection with sensor current limitation Oxygen concentration detection with sensor current limitation

1997-10-08

1999-08-10

Warden, Robert

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204406, 204427, 204428, 2057845, G01N 2726

Patent

active

059354003

ABSTRACT:
An A/F sensor is driven by a voltage applied thereto at a command issued by a microprocessor, outputting an A/F detection signal which is linearly proportional to the concentration of oxygen. The microprocessor controls the voltage applied to the A/F sensor to bring a current flowing through the A/F sensor to a predetermined value in a zone outside a predetermined air-fuel ratio detection zone. In this outside zone, the applied voltage is controlled in accordance with a characteristic different from a positive characteristic in a normal positive characteristic in a voltage-current relation. That is, in a rich zone outside the air-fuel ratio detection zone, the applied voltage is controlled so as to make the applied voltage approach a maximum value of the electromotive force of the A/F sensor. In a lean zone outside the air-fuel ratio detection zone, on the other hand, the applied voltage is controlled so as to make the applied voltage approach a minimum value of the electromotive force of the A/F sensor.

REFERENCES:
patent: 4665874 (1987-05-01), Kawanabe et al.
patent: 4702816 (1987-10-01), Hashimoto et al.
patent: 4818362 (1989-04-01), Asakura et al.
patent: 4908575 (1990-03-01), Usami et al.

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