Air fuel ratio detection using current-limited sensor with diffe

Details Air fuel ratio detection using current-limited sensor with diffe Air fuel ratio detection using current-limited sensor with diffe

1997-12-23

1999-11-30

Warden, Sr., Robert J.

Electrolysis: processes, compositions used therein, and methods

Electrolytic analysis or testing

For oxygen or oxygen containing compound

204424, 204425, 204428, G01F 164, G01N 1700, G01N 2726

Patent

active

059936410

ABSTRACT:
An A/F sensor outputs a linear air-fuel ratio detection signal proportional to the oxygen concentration in an exhaust gas from an engine upon application of a voltage. A computer controls the applied-voltage in a stoichiometric control region, a lean burn control region, an atmosphere detection region and a rich control region to have a fixed value such that the change rate of the applied-voltage is reduced to be less than that in other regions. In addition, when changing the voltage applied to the A/F sensor, the computer variably sets the voltage change speed sequentially. Thus, the influence of the capacitive characteristic of the A/F sensor is eliminated.

REFERENCES:
patent: 4534330 (1985-08-01), Osuga et al.
patent: 4553424 (1985-11-01), Sakurai et al.
patent: 4658790 (1987-04-01), Kitahara
patent: 4664773 (1987-05-01), Suzuki et al.
patent: 4707241 (1987-11-01), Nakagawa et al.
patent: 4882030 (1989-11-01), Suzuki et al.

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