Exhaust gas recirculation device

Details Exhaust gas recirculation device Exhaust gas recirculation device

1973-10-12

1978-03-21

Burns, Wendell E.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

F02M 2506

Patent

active

040797104

ABSTRACT:
An exhaust gas recirculation system whereby a part of exhaust gas is recirculated to the downstream of the carburetor throttle valve through an exhaust recirculation passage for removing the nitrogen oxides in exhaust gas discharged from an internal combustion engine, wherein a pressure control valve is provided in the after-flow of the flow control valve which controls the rate of exhaust gas recirculated to the downstream of the throttle valve disposed halfway in said exhaust recirculation passage, said pressure control valve being arranged such that its opening will be reduced when negative pressure in the downstream of the throttle valve is high and that said opening will be enlarged when said negative pressure is low, whereby the amount of exhaust gas taken into the engine is made basically proportional to the air intake so that the recirculation ratio will be maintained substantially constant over a wide range of operation.

REFERENCES:
patent: 3491736 (1970-01-01), Walker
patent: 3507260 (1970-04-01), Walker
patent: 3739797 (1973-06-01), Caldwell
patent: 3774583 (1973-11-01), King
patent: 3818880 (1974-06-01), Dawson

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