Air fuel ratio control apparatus having air-fuel ratio control p

Details Air fuel ratio control apparatus having air-fuel ratio control p Air fuel ratio control apparatus having air-fuel ratio control p

1997-06-30

2000-05-02

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123697, F02D 4130

Patent

active

060559721

ABSTRACT:
An air-fuel ratio sensor of a limit current type is used for an air-fuel ratio feedback control. When the air-fuel ratio sensor is in a semi-activated state, the air-fuel ratio sensor is driven into an electromotive force generating mode by a current externally applied thereto thereby to shift an electromotive force changing point so that an air-fuel ratio at which the electromotive force changes stepwisely is shifted from the stoichiometric ratio point to a lean zone. When the air-fuel ratio sensor is in a completely activated state, the air-fuel ratio sensor is applied with a voltage to produce a limit current varying with an air-fuel ratio so that a feedback control is performed based on the advanced control theory by using a linear current output characteristics.

REFERENCES:
patent: 4543176 (1985-09-01), Harada et al.
patent: 5544640 (1996-08-01), Thomas et al.
patent: 5709198 (1998-01-01), Sagisaka et al.

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