Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1977-12-23
1979-09-25
Burns, Wendell E.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
F02M 2506
Patent
active
041686845
ABSTRACT:
An EGR (Exhaust Gas Recirculation) control system comprises EGR control valve means including a first fluid chamber the vacuum in which increases and decreases in accordance with operating conditions of the engine whereby EGR control valve means control the recirculated amount of exhaust gases back to the engine and a second fluid chamber receiving therein a suction vacuum to thereby cause multiplication of the vacuum in the first chamber without altering the correspondency between the operating condition of the engine and the degree of opening of the EGR control valve means whereby the variable range of the vacuum in the first fluid chamber is optimally enlarged.
An EGR control system further comprises relief valve means for reducing the EGR ratio below a predetermined constant level upon high speed low load operating condition of the engine and which includes a fluid chamber directly communicating with the first fluid chamber of the EGR control valve means whereby the relief valve means is operated by the vacuum substantially equal to the vacuum in the first fluid chamber of the EGR control valve means.
REFERENCES:
patent: 4040402 (1977-08-01), Nohira et al.
patent: 4041914 (1977-08-01), Sugihara et al.
patent: 4041917 (1977-08-01), Suzuki
patent: 4044739 (1977-08-01), Miura et al.
patent: 4056084 (1977-11-01), Baumgartner
patent: 4066056 (1978-01-01), Nohira et al.
patent: 4069797 (1978-01-01), Nohira et al.
patent: 4092960 (1978-06-01), Nohira et al.
patent: 4094287 (1978-06-01), Nohira
Burns Wendell E.
Nissan Motor Company Limited
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