Exhaust gas purification apparatus for an internal combustion en

Details Exhaust gas purification apparatus for an internal combustion en Exhaust gas purification apparatus for an internal combustion en

1982-11-30

1985-11-19

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60290, 60293, F01N 322

Patent

active

045533881

ABSTRACT:
An exhaust gas purification apparatus in an internal combustion engine comprising a control device for biasing the air-fuel ratio of the exhaust gas toward the rich side or the lean side from the theoretical perfect air-fuel ratio in accordance with an operating condition of the engine. The control device can include a control valve controlled to open and close according to the output signal of an exhaust gas sensor interposed in a secondary air introducing passage connected to the exhaust passage of the engine upstream of the catalyzer. The control device can also include a device for causing a delay in opening or a delay in closing of the control valve in accordance with the operating condition of the engine.

REFERENCES:
patent: 3751915 (1973-08-01), Ranft
patent: 3869858 (1975-03-01), Goto
patent: 4169440 (1979-10-01), Taplin
patent: 4211074 (1980-07-01), Hattori
patent: 4250706 (1981-02-01), Mitsuda
patent: 4385491 (1983-05-01), Sakurai

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