Air-fuel ratio control system for internal combustion engines

Details Air-fuel ratio control system for internal combustion engines Air-fuel ratio control system for internal combustion engines

1993-10-15

1995-04-18

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, F01N 320

Patent

active

054067898

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine having a catalytic converter arranged in the exhaust system, and an air-fuel ratio sensor arranged upstream of the catalytic converter calculates an air-fuel ratio correction amount by means of proportional control and integral control based on an output from the air-fuel ratio sensor, and controls an air-fuel ratio of a mixture supplied to the engine, based on the air-fuel ratio correction amount. A control frequency at which the air-fuel ratio control is carried out is increased when deterioration of the catalytic converter is detected.

REFERENCES:
patent: 4703619 (1987-11-01), Chujo
patent: 5165230 (1992-11-01), Kayanuma
patent: 5203165 (1993-04-01), Wild
patent: 5220788 (1993-06-01), Kurita

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