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

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

1990-11-20

1991-12-10

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, F01N 228

Patent

active

050706934

ABSTRACT:
In an air-fuel ratio feedback system including a single air-fuel ratio sensor downstream of or within a three-way catalyst converter, an idling coarse-adjusting term is calculated integrally in accordance with the output of the air-fuel ratio sensor in an idling state of an engine. After the output of the air-fuel ratio sensor is inverted, the idling coarse-adjusting term is first rapidly changed, and thereafter, is slowly changed.

REFERENCES:
patent: 4173952 (1979-11-01), Asano
patent: 4173956 (1979-11-01), Ikeura
patent: 4840027 (1989-06-01), Okumura

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