Internal-combustion engines – Charge forming device – Auxiliary control of carburetor fuel metering
Patent
1980-01-04
1981-09-22
Myhre, Charles J.
Internal-combustion engines
Charge forming device
Auxiliary control of carburetor fuel metering
123437, 261 44C, 261 56, 261 69A, 261121B, F02M 700, F02M 906, F02B 300
Patent
active
042903998
ABSTRACT:
A floatless variable venturi type carburetor in which the float chamber is substituted by a fuel pressure regulator. The carburetor has, in addition to the ordinary constituents such as variable orifice, fuel metering jet and air bleed, a fuel valve disposed in the fuel passage leading to the fuel metering jet and adapted to be opened and closed in relation to the turning on and off of the engine key switch, and a fuel pressure regulator adapted to regulate the pressure of the fuel introduced to the fuel metering jet through the fuel valve. The fuel pressure regulator has two regulating chambers, one of which being communicated with the inlet side of the fuel valve while the other being in communication with a venturi vacuum pickup port, so that the fuel pressure regulator maintains a constant pressure differential, by the action of a diaphragm separating two regulating chambers, between the fuel pressure at the inlet side of the fuel metering jet and the venturi vacuum. The fuel pressure regulator also is so constructed that its valve mechanism constitutes a part of a fuel return passage to a fuel tank. The carburetor is advantageously incorporated in a feedback system for controlling the air-fuel ratio of the mixture formed in the carburetor, the system having an exhaust gas sensor disposed in the exhaust system of the engine, a control circuit adapted to produce a control signal in response to the output from the exhaust gas sensor, and an actuator adapted to operate in response to the control signal, and means for varying the opening area of the air bleed in response to the operation of the actuator.
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Morino Toshiharu
Takada Shigetaka
Aisan Industry Co. Ltd.
Myhre Charles J.
Nelli R. A.
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