Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Patent
1979-08-27
1981-02-10
Burns, Wendell E.
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
F02B 4708, F02M 2506
Patent
active
042495032
ABSTRACT:
An exhaust gas recirculation system for an internal combustion engine employs an exhaust gas recirculation control valve in a passageway connecting the engine exhaust passage to the engine intake passage downstream from the throttle valve. The intake passage also provides a choke valve and a carburetor venturi section between the valves. An air conduit having an air control valve therein connects the intake passage between the throttle valve and the choke valve to the intake passage downstream from the throttle valve. Vacuum responsive actuators are provided for each of the control valves and they are operated by vacuum pressure regulated by a regulating valve, which is itself responsive to differential pressure between vacuum intensity in the intake passage upstream from said throttle valve and modified atmospheric pressure. The modified atmospheric pressure is obtained downstream of a restriction in the air conduit. Closing of the choke valve on a cold start of the engine causes high vacuum intake to the air conduit, reducing the exhaust gas recirculation through the exhaust gas recirculation control valve.
REFERENCES:
patent: 3739797 (1973-06-01), Caldwell
patent: 3779222 (1973-12-01), Lorenz
patent: 3818880 (1977-06-01), Dawson
patent: 3884200 (1975-05-01), Caldwell
patent: 3915136 (1975-10-01), Caldwell
patent: 3970061 (1976-07-01), Caldwell
patent: 4033308 (1977-07-01), Hayashi et al.
Nishimura Hiroyuki
Noguchi Takeshi
Umemoto Takashi
Burns Wendell E.
Honda Giken Kogyo Kabushiki Kaisha
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