Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1977-09-29
1979-04-10
Burns, Wendell E.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
F02M 2506
Patent
active
041482867
ABSTRACT:
An engine exhaust gas recirculation system has an E.G.R. passage for recirculating exhaust gases from an exhaust system of an engine back into an intake system thereof downstream of a throttle valve. The E.G.R. passage has a restriction orifice therein and an E.G.R. control valve responsive to a vacuum signal to control the recirculation of exhaust gases through the E.G.R. passage. A pressure comparator and modulator is pneumatically connected to the E.G.R. passage upstream and downstream of the restriction orifice, to the carburetor venturi, to the intake manifold and to the E.G.R. control valve and operative to compare the venturi vacuum with the exhaust gas pressure difference across the restriction orifice thereby to modulate the intake manifold vacuum to be fed to the E.G.R. control valve so that the latter is controlled by the thus modulated vacuum to keep the exhaust gas pressure difference proportional to the venturi vacuum whereby the volumetric quantity of recirculated exhaust gases is made proportional to the volumetric quantity of engine intake air.
REFERENCES:
patent: 3814070 (1974-06-01), Wertheimer
patent: 3926161 (1975-12-01), Wertheimer
patent: 4075992 (1978-02-01), Linder et al.
Kohama Tokio
Nohira Hidetaka
Obayashi Hideki
Ozaki Tadashi
Burns Wendell E.
Nippon Soken Inc.
Toyota Jidosha Kogyo Kabushiki Kaisha
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