Exhaust gas recirculation system for an internal combustion engi

Details Exhaust gas recirculation system for an internal combustion engi Exhaust gas recirculation system for an internal combustion engi

1978-11-22

1980-09-16

Burns, Wendell E.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

F02M 2506

Patent

active

042223571

ABSTRACT:
Disclosed herein is a back pressure control type EGR system for an internal combustion engine, wherein a vacuum modulator has an air introducing chamber which is selectively opened, in accordance with the pressure of recirculated exhaust gas, to a vacuum line connecting an EGR port with a vacuum operated flow control valve. The air introducing chamber is further connected to another vacuum port formed slightly above the EGR port via another vacuum line. Switching valve devices responsive to the temperature of the engine are located on the vacuum lines for stopping the EGR operation when the engine is cold.

REFERENCES:
patent: 4041917 (1977-08-01), Suzuki et al.
patent: 4090482 (1978-05-01), Yoshida
patent: 4092960 (1978-06-01), Nohira et al.

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