Mixture carburation device for the operation in idling conditions in progression of an internal combustion engine
AssigneeAlpha Romeo S.p.A.
InventorsGiampaolo Garcea, Gennaro Police, Angelo Ciccarone
Life of this patent
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Abstract
A fuel feeding system for internal combustion engines, of the type comprising a carburettor with a throttle controlling the main flow of fuel-air mixture to the cylinders, the carburettor further comprising a pre-mixing chamber for the air-fuel mixture, which communicates with the engine intake duct by means of ports located both upstream and downstream of the throttle in its closed condition, said pre-mixing chamber feeding also with air-fuel mixture a secondary chamber, communicating both with the atmospheric air and with the intake duct downstream of the said throttle, whereby the fuel-air ratio is kept constant both at idling and at low RPM of the engine.
Claims8
A carburettor for an internal combustion engine, more particularly for a motor vehicle, said carburettor being of the kind essentially formed by at least a principal system for metering and forming the mixture drawn by the engine during its operation at fair and high powers, by at least an additional system called for idling and progression for metering and forming the mixture drawn by the engine during its operation at no power and at small powers, and by at least one throttle for throttling the mixture fed to the engine, the position of the throttle governing the magnitude of the power delivered by the engine when operating, the improvement wherein said carburettor is characterized in that said idling and progression system is essentially formed by at least one emulsion chamber and a compensation chamber, said at least one emulsion chamber and said compensation chamber communicating each by means of a calibrated hole with a duct which in turn communicates with the intake duct of the engine upstream of the throttle, at least one hole being provided in the feed duct in the vicinity of the throttle edge so as to arrive upstream of the throttle when the latter is closed, that is in the position of maximum throttling, and to come downstream of the throttle when the latter is in a position of slight opening, the feeding duct being put in communication through said at least one hole with a duct, said at least one emulsion chamber and compensation chamber communicating each with said duct and thus communicating each with the intake duct upstream of the throttle when the throttle is closed, downstream of the throttle when the latter is slightly open, said at least one emulsion chamber being in communication with the intake duct in the area downstream of the throttle through a respective calibrated hole and being further in communication with the float chamber through a calibrated hole, whereas said compensation chamber is in communication with the intake duct in the area downstream of the throttle through an adjustable section port, said at least one emulsion chamber being also in communication with said compensation chamber through a respective calibrated hole.
Dependencies are inferred from the claim text.