Exhaust gas purifying method of an internal combustion engine

Details Exhaust gas purifying method of an internal combustion engine Exhaust gas purifying method of an internal combustion engine

1980-07-28

1983-03-08

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60289, 60290, F01N 322

Patent

active

043757464

ABSTRACT:
An air-fuel ratio discrimination signal, having two voltage levels depending upon whether the air-fuel ratio of the engine is rich or lean in comparison with a predetermined air-fuel ratio, is generated in accordance with the sensed signal from a sensor which detects the concentration of a particular component in the exhaust gas. Then, the amount of secondary air supplied into the exhaust system of the engine is gradually increased or decreased in accordance with the level of the air-fuel ratio discrimination signal. Furthermore, the amount of secondary air supplied into the exhaust system is additionally increased or decreased in accordance with the average value of the air-fuel ratio discrimination signal.

REFERENCES:
patent: 4119074 (1978-10-01), Masaki
patent: 4131089 (1978-12-01), Fujishiro
patent: 4175386 (1979-11-01), Katahira
patent: 4203394 (1980-05-01), Aono
patent: 4211074 (1980-07-01), Hattori

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