Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1978-08-11
1980-06-17
Myhre, Charles J.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
123119EC, F02M 3900
Patent
active
042078490
ABSTRACT:
An air-fuel ratio control apparatus for an internal combustion engine has an air valve disposed in an intake passage downstream of a throttle valve to cooperate therewith to define an air pressure chamber and operative to maintain a substantially constant pressure therein. A fuel circuit includes a fuel discharge port open to the intake passage and a fuel-metering orifice operatively associated with the air valve such that the fuel-flowing section of the orifice is varied in proportion to the air-flowing section of the air valve. A constant differential fuel pressure valve is disposed in the fuel circuit to maintain a substantially constant fuel pressure difference across the fuel metering orifice during normal engine operation. The differential fuel pressure valve is mechanically operatively connected to a piston-cylinder assembly into which the fuel pressure upstream of the fuel-metering orifice is introduced. The position of the piston relative to the cylinder is varied when the engine operating condition is varied. The movement of the piston varies the fuel-flowing section of the differential fuel pressure valve thereby to vary the fuel pressure difference across the fuel-metering orifice whereby the air-fuel ratio is varied when the engine operating condition is varied.
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patent: 3835828 (1974-09-01), Knapp
patent: 3894523 (1975-07-01), Stumpp
patent: 3993034 (1976-11-01), Passara et al.
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Ando Tsuneo
Minoura Mikio
Motosugi Katsuhiko
Sekiya Setsuro
Sumiyoshi Masaharu
Aisan Industry Co. Ltd.
Myhre Charles J.
Nelli Raymond A.
Toyota Jidosha Kogyo Kabushiki Kaisha
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