Air-fuel ratio feedback control system having a single air-fuel

Details Air-fuel ratio feedback control system having a single air-fuel Air-fuel ratio feedback control system having a single air-fuel

1991-06-20

1992-04-14

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60285, F02D 4114

Patent

active

051036401

ABSTRACT:
In an air-fuel ratio feedback control system including a single air-fuel ratio sensor downstream of a three-way catalyst converter, the coarse-adjusting term is calculated in accordance with the air-fuel ratio sensor disposed downstream of the catalyst converter, and the gradual change of the coarse-adjusting term is inhibited when the O.sub.2 storage effect is reduced and the duty ratio of the inverting cycle is shorter than a predetermined value.

REFERENCES:
patent: 4177787 (1979-12-01), Hattori et al.
patent: 4364227 (1982-12-01), Yoshida et al.
patent: 5052177 (1991-10-01), Nada
patent: 5070692 (1991-12-01), Nada
patent: 5070693 (1991-12-01), Nada

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