Jet for the production of a vaporized idling mixture in an inter

Details Jet for the production of a vaporized idling mixture in an inter Jet for the production of a vaporized idling mixture in an inter

1981-03-26

1982-09-14

Miles, Tim R.

Gas and liquid contact apparatus

Fluid distribution

Valved

261DIG38, 261121B, F02M 308

Patent

active

043494897

DESCRIPTION:

BRIEF SUMMARY
This invention relates to the process for the production of an idling vaporized mixture to be fed into the inlet manifold of an internal combustion engine; it includes a slow-running jet to be fitted to an auxlilary idling carburettor required for the implementaion of the invention.
It is well-known that in an internal combustion engine the idling speed, when the main butterfly throttle is closed, is normally provided by an auxiliary carburettor fitted with a slow-running jet. For needle valve type jets of existing design, a single chamber is provided to produce the air-fuel mixture.
This type of jet has several disadvantages. Firstly, the mixture produced is not completely homogeneous and results in considerable waste of fuel when the engine is idling. Now, for town driving, consumption at this engine speed greatly influences the average consumption of the vehicle; furthermore, the exhaust gases which are incompletely burned when the engine is idling, represent a serious source of pollution.
Furthermore, known types of slow-running jets with mobile needle-valves close with relative abruptness when the engine speed is increased from idling to a faster rate; this occasionally prevents a smooth increase in speed and may cause the engine to stall.
The object of this invention is to remedy the faults of slow-running jets of known design.
The principal object of the invention is to provide a perfected process for the production of the slow-running vaporized mixture, thus ensuring that this mixture is completely homogeneous.
A further object of the invention is to produce in consequence considerable economies of fuel, particularly when the vehicle is being driven in towns or in built-up areas.
Another object of the invention is to provide a smooth transfer of the engine speed from the idling speed to higher speeds, thus eliminating any risk of stalling the engine.
Finally, this invention is designed to improve a principal vaporized mixture at intermediate or even higher engine speeds in order to improve combustion and permit considerable fuel economy at these engine speeds.
The process forming the subject of this invention is of the type in which a flow of idling fuel C.sub.r is mixed with a flow of idling air A.sub.r in an auxiliary slow-running carburettor; in this invention, the mixture is produced in two phases: chamber, and which consists in mixing the slow-running fuel flow C.sub.r with an auxiliary intake of air A.sub.a, smaller than flow A.sub.r, in order to obtain a highly vaporized premixture M.sub.P of air and fuel, chamber, which consists in mixing the premixture M.sub.p with the idling air flow A.sub.r.
The most satisfactory premixture M.sub.p is obtained by using an auxiliary air intake A.sub.a of between approximately 2% and 20% of the slow-running air inlet A.sub.r.
Experiments have shown that this procedure results in the production of a homogeneous vapour mixture which provides notable fuel consumption economy while the engine is idling.
The homogeneity of the vapour mixture obtained is still further improved in the following manner: chamber to form the premixture M.sub.p are positioned approximately at right angles to each other or secant and less than 30.degree. from the perpendicular, and centrifugal at its immediate outlet and is then directed longitudinally towards the mixing chamber, A.sub.r and the premixture M.sub.p entering the chamber through inlets which are approximatly at right angles or secant and less than 30.degree. from the perpendicular.
A vaporized mixture of exceptional homogeneity is thus obtained, which meets the optimum conditions required to minimize fuel consumption and pollution when the engine is idling.
A further characteristic of this invention is that the premixture M.sub.p is formed by means of a flow of fuel C.sub.r which can be varied in inverse proportion to the engine speed so that it is at its maximum at the idling speed and decreases progressively at intermediate speeds up to its minimum, nil or very low value at high engine speeds.
In this manner, the engin

REFERENCES:
patent: 2962269 (1960-11-01), Stanton
patent: 3313532 (1967-04-01), Carlson et al.
patent: 3408054 (1968-10-01), Walker
patent: 3503594 (1970-03-01), Goto
patent: 3952076 (1976-04-01), Chatelain
patent: 4075296 (1978-02-01), Orsini et al.
patent: 4146594 (1979-03-01), Raud

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