US 5,520,864 AGranted

Controlled mixture formation

OwnerBeat Freiinventor

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Abstract

Controlled mixture formation. This invention pertains to the generation of homogenous mixtures having a freely selectable composition and is produced by using a rotary distribution cup driven by its own motor, with metered quantities of fuel being supplied to the pre-chamber of a rotary fuel distribution cup via a feed pipe extending through a metering valve in such a manner that the composition of the mixture produced in each case can be adjusted, irrespective of the amount of the air, over the entire operating range of the internal combustion engine, with the fuel being radially distributed by centrifugal force, very finely divided and mixed with air in a mixing chamber wherein the quantity and composition of the mixture are adjusted by means of the metering valve in conjunction with a control valve in such a way that the production of the mixture and its conveyance take place at approximately ambient pressure, with a motor performance graph establishing the optimum setting for the metering and regulating valves for mixture production at approximately ambient pressure while improving fuel consumption and the exhaust gas quality, with the invention, in connection with the noted control system being especially suitable for the best possible operation of four-stroke engines with lean fuel mixtures at lambda values of at least 1.5.

Claims19

Dependent claims

A process for continuously generating fuel-air mixtures of a freely selectable composition in a mixing chamber including an air inlet, a mixture outlet, an axial central feed pipe for liquid fuel, with the feed pipe being operatively associated with a metering valve, and a rotary fuel distributor having a separate driving motor, and a central prechamber, with the prechamber having a bottom and at least one lateral opening for the liquid fuel, an annular channel being provided between the rotary distributor and a wall of said mixing chamber, with the liquid fuel being delivered to the rotary distributor via the prechamber, said process comprising:

(a) dividing the liquid fuel into fine drops by utilizing a rotary distributor in the form of a distributor cup, said distributor cup being open at the top and having an annular distributor plate with an upper annular distributing surface in communication with the central prechamber via the lateral opening and an ascending cylinder, with the cylinder having an ascending inner surface and an upper distributing edge;
(b) arranging the central feed pipe in the central prechamber so that the feed pipe extends axially without contact into said prechamber, with an outlet opening of the feed pipe being arranged at a sufficient axial distance from the bottom of the prechamber so that the liquid fuel can emerge unimpeded in any desired controlled amount from the outlet opening of the feed pipe;
(c) immediately radially carrying away the delivered liquid fuel via the bottom of the prechamber due to centrifugal force and conducting the liquid fuel, via the lateral opening, to the annular distributing surface of the rotary distributor cup;
radially spreading out said liquid fuel and forming a continuous film on the distributing surface and on the inner ascending surface of the cylinder;
continuously dividing said continuous film on the distributing surface of the ascending cylinder;
delivering the divided droplets in the form of extremely fine fuel droplets;
and intimately mixing the fine fuel droplets with air flowing in the annular channel;
and
(d) freely selecting the composition of the fuel-air mixture, in each case, by metering the fuel component of the fuel-air mixture via the metering valve irrespective of the amount of air being present.

6 more elements

A mixture generating apparatus having a mixing chamber with a wall, an air inlet, a mixture outlet, a fixed feed pipe having a free end and an outlet opening operatively associated with a metering valve and a rotary distributor, with the rotary distributor being independently driven, a central prechamber having a bottom and at least one lateral opening, with an annular channel being provided between the rotary distributor and the wall of the mixing chamber, wherein:

(a) the distributor consists of a rotary cup having a distributing plate and an annular distributing surface, with the distributing surface communicating with the prechamber via said at least one lateral opening;
and an ascending cylinder having an upper distributing edge;
and
(b) the free end of the feed pipe extending axially and without contact into the prechamber, with said outlet opening being disposed at an axial distance from the bottom of the prechamber in such a manner so as to enable the liquid fuel to emerge unimpeded and to be immediately carried away, due to centrifugal force, by the bottom of the prechamber and to be supplied via the lateral opening to the distributing surface of the rotary cup and to be radially spread out thereon in the form of a film and to be finely divided at the upper distributing edge.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 08/387,807Filed 21 Feb 1995
Granted: 28 May 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F02M 17/16
Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 -…:…
F02D 35/0046
Using exhaust gas sensors: controlling fuel supply
F02M 69/06
Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel:…
F02B 1/04
With positive ignition: with fuel-air mixture admission into cylinder