Air-fuel ratio control system

Details Air-fuel ratio control system Air-fuel ratio control system

1979-07-10

1981-02-24

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 123440, 123489, F01N 315

Patent

active

042519896

ABSTRACT:
An air-fuel ratio control system comprises a comparator circuit for comparing a predetermined reference level with an output signal of a first oxygen sensor disposed upstream of a three-way catalyst for purifying the exhaust gas in the exhaust system of an internal combustion engine, the comparator circuit producing a signal indicative of whether the output signal of the first oxygen sensor is higher (lean) or lower (rich) than a predetermined air-fuel ratio, a delay circuit for delaying at least one of the output signals of the comparator circuit, and a delay time adjusting circuit for adjusting the delay time of the signal delayed by the delay circuit, in accordance with the value of the output signal of a second oxygen sensor disposed downstream of the three-way catalyst.

REFERENCES:
patent: 3782347 (1974-01-01), Schmidt
patent: 3875907 (1975-04-01), Wessel
patent: 3939654 (1976-02-01), Creps
patent: 3990411 (1976-11-01), Toelle
patent: 4007589 (1977-02-01), Neidhard
patent: 4130095 (1978-12-01), Bowler

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