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

1991-07-24

1992-07-07

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60285, F01N 320

Patent

active

051272253

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 and the O.sub.2 adjusting term are calculated in accordance with the air-fuel ratio sensor, and a proportional amount of said O.sub.2 adjusting term is reduced in accordance with a degree of a deterioration of said catalyst converter, when the catalyst converter is deteriorated, to thus improve the drivability of a vehicle.

REFERENCES:
patent: 4691562 (1987-09-01), Abthoff et al.
patent: 5052177 (1991-10-01), Nada
patent: 5070692 (1991-12-01), Nada
patent: 5070693 (1991-12-01), Nada

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