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

1990-12-28

1991-12-10

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, F01N 228

Patent

active

050706926

ABSTRACT:
In an air-fuel ratio feedback system including a single air-fuel ratio sensor downstream of or within a three-way catalyst converter, a warming-up O.sub.2 storage term AF.sub.CCRO is calculated in a warming-up mode, and a coarse-adjusting term AF.sub.C and an after-warming-up term AF.sub.CCRO, are calculated in an after-warming-up mode. The warming-up O.sub.2 storage term AF.sub.CCRO is weakly dependent on an O.sub.2 storage amount of the catalyst converter but the after-warming-up O.sub.2 storage term AF.sub.CCRO, is strongly dependent on the O.sub.2 storage amount of the catalyst converter.

REFERENCES:
patent: 4027477 (1977-06-01), Storey
patent: 4153023 (1979-05-01), Asano
patent: 4155335 (1979-05-01), Hosaka
patent: 4167924 (1979-09-01), Carlson
patent: 4817384 (1989-04-01), Okumura et al.
patent: 4840027 (1989-06-01), Okumura
patent: 4941318 (1990-07-01), Matsuoka

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