Exhaust gas purifying apparatus for automobile multi-cylinder en

Details Exhaust gas purifying apparatus for automobile multi-cylinder en Exhaust gas purifying apparatus for automobile multi-cylinder en

1978-08-11

1980-08-05

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60293, 60294, 60301, F01N 315, F01N 310

Patent

active

042155428

ABSTRACT:
An exhuast gas purifying apparatus for use in an automobile multi-cylinder engine of the type which has exhaust ports communicating with engine cylinders and through which exhaust gases are emitted subsequent to combustion of an air-fuel mixture. The exhaust gas purifying apparatus comprising a reducing catalyst unit and a three-way catalyst unit which are disposed in a main exhaust manifold which is connected at one end to a first group of the exhaust ports and at the other end to the atmosphere, and an auxiliary exhaust manifold connected at one end to a second group of the exhaust ports and at the other end to a portion of the main exhaust manifold at a location downstream of the reducing catalyst unit and upstream from the three-way catalyst unit. A pressure operated valve is disposed in a secondary air supply passage for introducing a secondary air into the auxiliary exhaust manifold by the utilization of the pulsating flow of the exhaust gases through the auxiliary exhaust manifold. This secondary air supply passage also has a control valve for regulating the flow of the secondary air therethrough during the opening of the pressure operated valve.

REFERENCES:
patent: 3767764 (1973-10-01), Dolbear
patent: 3791144 (1974-02-01), Lang
patent: 3906722 (1975-09-01), Garcea
patent: 3984975 (1976-10-01), Price
patent: 4077208 (1978-03-01), Sawada
patent: 4165611 (1979-08-01), Ishikawa

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