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

1990-02-21

1991-10-01

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, F01N 320

Patent

active

050521772

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 coarse-adjusting term is calculated integrally in accordance with the output of the air-fuel ratio sensor, and a fine-adjusting term is calculated differentially at every reversion of the actual air-fuel ratio in accordance with the coarse-adjusting term and the fine-adjusting term. When a time of the reversion of the output of the air-fuel ratio sensor is small, the calculation of the coarse-adjusting term is prohibited.

REFERENCES:
patent: 4223644 (1980-09-01), Latsch
patent: 4303049 (1981-12-01), Ikeura
patent: 4586893 (1986-05-01), Somerville
patent: 4676215 (1987-06-01), Blocher
patent: 4817383 (1989-04-01), Masui

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