Carburation devices for internal combustion engines
AssigneeSociete Industrielle de Brevets et d'Etudes S.I.B.E.
InventorFrancois Mennesson
Life of this patent
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Abstract
A carburetor has a main throttle and an auxiliary throttle which is automatically opened in proportion to the air flow in the induction pipe. Fuel is delivered to the induction pipe through a passage whose cross-section is metered in accordance with the position of the auxiliary throttle. The richness of the air-fuel mixture is automatically adjusted by a system comprising a probe which is sensitive to the conditions prevailing in the exhaust pipe. The system periodically opens an air path to the fuel passage and the duration of each opening period is automatically determined for a correct richness to be achieved.
Claims8
A carburation device for internal combustion engines, comprising:
- an induction pipe;
- driver actuated main throttle means in said pipe;
- auxiliary throttle means located in said induction pipe upstream of said main throttle means and which automatically and progressively open in proportion to the increase in the flow rate of air in said induction pipe;
- a source of fuel at substantially atmospheric pressure;
- conduit means for delivery of fuel from said source to a portion of said induction pipe between said main throttle means and auxiliary throttle means;
- metering means operatively connected to said auxiliary throttle means and metering the flow rate of fuel in said conduit means wherein an air flow section determined by the auxiliary throttle means is in proportion to a fuel flow section metered by said metering means and the mixture of air and fuel delivered to said induction pipe has a substantially constant richness during normal operation;
- a solenoid valve which, in energized conditions, fully opens an air path to said fuel conduit means and under de-energized conditions fully closes the path;
- and means responsive to a parameter of the engine exhaust gas and which repetitively energizes the solenoid valve for a fraction of the repetition period which is such that the total time during which the valve is fully open during a predetermined time duration is adjusted in dependence on said exhaust gas parameter.
Dependencies are inferred from the claim text.