EP0400212A1 - Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren - Google Patents

Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren Download PDF

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Publication number
EP0400212A1
EP0400212A1 EP89118681A EP89118681A EP0400212A1 EP 0400212 A1 EP0400212 A1 EP 0400212A1 EP 89118681 A EP89118681 A EP 89118681A EP 89118681 A EP89118681 A EP 89118681A EP 0400212 A1 EP0400212 A1 EP 0400212A1
Authority
EP
European Patent Office
Prior art keywords
heating
fuel
nozzle
nozzle body
gap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89118681A
Other languages
German (de)
English (en)
French (fr)
Inventor
Martin Prof. Dr. Feldinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of EP0400212A1 publication Critical patent/EP0400212A1/de
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M15/00—Carburettors with heating, cooling or thermal insulating means for combustion-air, fuel, or fuel-air mixture
    • F02M15/02—Carburettors with heating, cooling or thermal insulating means for combustion-air, fuel, or fuel-air mixture with heating means, e.g. to combat ice-formation
    • F02M15/022—Carburettors with heating, cooling or thermal insulating means for combustion-air, fuel, or fuel-air mixture with heating means, e.g. to combat ice-formation near to manually operated throttle valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M33/00—Other apparatus for treating combustion-air, fuel or fuel-air mixture
    • F02M33/02—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel
    • F02M33/04—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel returning to the intake passage
    • F02M33/06—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel returning to the intake passage with simultaneous heat supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M9/00—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position
    • F02M9/12—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having other specific means for controlling the passage, or for varying cross-sectional area, of fuel-air mixing chambers
    • F02M9/127—Axially movable throttle valves concentric with the axis of the mixture passage
    • F02M9/133—Axially movable throttle valves concentric with the axis of the mixture passage the throttle valves having mushroom-shaped bodies

Definitions

  • the invention relates to a fuel-air mixture formation device for internal combustion engines with a rotationally symmetrical nozzle body which, together with a rotationally symmetrical throttle body which can be displaced therein, forms a convergent-divergent nozzle which opens into an intake manifold of the internal combustion engine, and also in the vicinity of the narrowest cross section of the nozzle is provided around this circumferential and into this gap into which at least one fuel supply line opens.
  • the fuel is fed across the entire circumference of the nozzle in a film-like manner transversely to the direction of flow of the air flowing through the nozzle.
  • the main mass of the supplied fuel is subsequently due to the cross to the force
  • the mass of air flowing is atomized, the resulting droplet size decreasing with increasing velocity of the air mass flow.
  • the fuel flowing in the radial gap adheres to its walls as a result of adhesion and, even after passing into the divergent nozzle area of the nozzle body, remains adhered to the walls of the nozzle body in a more or less strong film up to the end of the nozzle body.
  • the fuel film detaches in the form of larger droplets due to the low air velocity there, in contrast to the much smaller droplets in the core flow of the fuel-air mixture.
  • the result is a stronger fuel film in the intake manifold with the consequent disadvantage of an uneven mixture composition for the individual cylinders and for one and the same cylinder during successive work cycles, which leads to an unsteady load on the engine and causes changes in the average exhaust gas composition, so that even after Catalyst a deterioration in the exhaust gas quality is recorded.
  • the nozzle body is provided with a heating device in the divergent nozzle area.
  • the heating should begin as close as possible to the point at which the fuel is supplied, thus the gap that opens into the nozzle. It can be done, for example, electrically and / or preferably - by a medium heated by the engine, in particular cooling water, lubricating oil, exhaust gas.
  • the heating device should expediently be arranged in the immediate vicinity of the inner wall of the relevant section of the nozzle body, the one located on the inner wall evaporates The film of fuel is almost completely removed, the more the wall of the nozzle body is heated up.
  • the fuel-air mixture passing into the intake manifold thus contains only fuel droplets of very small diameter in addition to fuel vapor, which are subsequently hardly centrifuged due to changes in the intake manifold's curvature and thus reduce the intake manifold wetting to an insignificant size for practical engine operation.
  • the nozzle body is also prevented from icing up by heating the nozzle body in the divergent nozzle area.
  • the heating device extends over the entire length of the nozzle body arranged downstream of the gap and thus heating of the nozzle body takes place from the fuel inlet area to the intake manifold;
  • the suction pipe in particular the area of the suction pipe facing the nozzle end, is expediently heated by means of a heating device. This heating can also be done, for example, electrically and / or by a medium heated by the engine.
  • the heating device can be designed such that it has heating channels arranged in the nozzle body in the region of its inner wall with a heating medium inlet and a heating medium outlet.
  • the heating channels can pass through helically arranged heating fins, the heating medium expediently flowing through the nozzle through the nozzle against the direction of flow of the fuel-air mixture.
  • the heating element is to be heated.
  • the thermal resistance between the heating device and the fuel-carrying components should be kept as large as possible by means of suitable measures. This can be ensured, for example, by insulating materials and / or small heat conducting cross sections and / or long heat conducting paths between the heating device and the fuel-carrying components.
  • an imaginary longitudinal axis of the fuel-air mixture formation device around which parts of this mixture formation device are formed symmetrically, is designated by 1.
  • Formed essentially rotationally symmetrical is a nozzle body 2 with its inner wall 3.
  • the interior space delimited by the inner wall in the nozzle body tapers downward in its upper region 4 to a point at reference number 5 of the narrowest clear cross-section.
  • This is followed at the bottom by a straight diffuser 6, which opens into a suction pipe 7 of the internal combustion engine.
  • Air is applied to the fuel-air mixture formation device at the top via an air filter (not shown).
  • the main air mass flow therefore flows in the direction of arrow L from top to bottom.
  • a throttle body 8 which is likewise rotationally symmetrical about the longitudinal axis and is adjustable in the direction of the longitudinal axis according to double arrow A, is used in connection with the nozzle body.
  • An upper part of the throttle body expands continuously from above and opens into a substantial lower part of the throttle body, which tapers continuously from top to bottom. The passage for the air mass flow between the nozzle body and the throttle body is thus narrowed the more the throttle body is shifted downward.
  • the nozzle body forms a convergent-divergent nozzle together with the throttle body.
  • the wall of the nozzle body is provided with a fuel feed bore 9 which merges into a fuel gap 11 via a fuel ring channel 10.
  • the fuel gap lies in a cross-sectional plane in the area of the narrowest clear cross-section and has a gap opening 12 directed towards the interior of the nozzle body.
  • the gap opening like the circumferential fuel gap, thus extends over 360 °.
  • the fuel ring channel is designed with a relatively small flow resistance, while the fuel gap has a relatively high flow resistance.
  • the fuel gap is overridden Substance air introduced at higher pressure almost under ambient air pressure.
  • the fuel gap is connected via an air ring duct 13 and bores 14 to an interior section, not shown in more detail, in the nozzle body, in which practically the air pressure in the environment prevails, while in the gap opening 12 there is an air pressure of approximately half the ambient pressure, and the air at this point flows at the speed of sound.
  • the air supply prevents the formation of vapor bubbles, since the fuel is practically under atmospheric pressure.
  • the air supply and the fuel gap adjoining it are dimensioned such that some air is mixed with the fuel in them. This gives the fuel emerging from the gap opening 12 a higher speed than without such an admixture of air. As a result, the fuel is supplied to the combustion air or the air mass flow evenly over the circumference of the nozzle body and in film form.
  • the straight diffuser is provided with a heating device 15, which causes the fuel film located on the wall of the diffuser to evaporate almost completely.
  • FIG. 1 shows an embodiment of a heating device 15 with a heating channel 16 arranged in the nozzle body in the region of its inner wall.
  • the heating channel is designed in a ring shape and completely surrounds the inner wall of the diffuser. It has a downstream engine cooling water inlet 17 and an upstream engine cooling water outlet 18, based on the flow passing through the diffuser, so that the diffuser is heated in countercurrent by the hot engine cooling water. So that the fuel supplied radially to the diffuser is not heated by the engine cooling water - which could subsequently lead to the formation of vapor bubbles - the thermal resistance between the engine cooling water and the fuel-carrying ducts is kept as large as possible by constructive design of the fuel-air mixture formation device.
  • the heating channel is formed between a first, inner, the diffuser ring element 19 and a second, outer ring element 20, the inner ring element is provided at its upstream end with a radially outwardly extending ring plate 21, between this and that
  • the fuel gap is formed in a separate component forming the upper region of the nozzle body.
  • the outer ring element lying on the outside of the inner ring element is spaced apart from the ring plate 21 with an equally radially outwardly extending ring plate 22, which is supported in the region of its free outer end by an insulating ring 23 on the ring plate 21.
  • An annular air gap 24 is formed between the two ring plates, in the area of the air ring channel and the gap opening the ring plate 21 has a reduced plate thickness and the thickness of the inner ring element in the area of the gap opening is also reduced.
  • the reduced thickness of the inner ring element and the ring plate 21 causes a reduction in the heat conducting cross sections through these components and thus an increased thermal resistance, in the same direction the air gap located between the two ring plates and the insulating ring between the ring plates.
  • the wall of the intake manifold opposite the diffuser end is also provided with a heating device 26, which has a heating channel 27 symmetrical to the axis of rotation of the throttle body and an engine cooling water inlet 28 and an engine cooling water outlet 29 at the same distance from this axis having.
  • FIG. 1 shows a fuel-air mixture formation device designed in accordance with the left half of the figure, but in which the heating device 15 has a helically arranged heating rib 30 which is connected to the inner ring element and passes through the heating duct.
  • the heating rib is arranged in such a way that the engine cooling water flows through the diffuser through the heating duct against the direction of flow of the fuel-air mixture.
  • FIG. 2 shows in the left half of the figure a configuration of the fuel-air mixture formation device according to the invention which corresponds to the left half of FIG. 1, but in which a helical, electrically heatable heating coil 31 is inserted into the heating duct.
  • the electrical supply lines to the heating coil are not shown in this image area.
  • the engine cooling water can be electrically heated by means of the heating coil in the warm-up phase of the internal combustion engine. When the operating temperature of the engine is reached, the heating coil is switched off and the inner wall of the diffuser is only heated using the hot engine cooling water.
  • FIG. 2 illustrates a variant in which the heating of the inner wall of the diffuser does not take place via a heating medium flowing through a heating channel, but rather insulated, electrical heating coils 32 directly penetrate the ring element 19 forming the diffuser.
  • an exterior Ring element 20 are dispensed with, the ring plate 22 is received by the ring element 19.
  • the inner wall of the diffuser is only heated electrically.
  • FIG. 3 shows a further embodiment of the fuel-air mixture formation device according to the invention, in which the diffuser is designed as a radial diffuser. Parts which correspond in their function to the embodiments in FIGS. 1 and 2 are identified by the same reference numerals.
  • the device shown in FIG. 3 is provided with a heating channel 16 with an opposite engine cooling water inlet 17 and engine cooling water outlet 18.
  • the device according to FIG 3 the same measures - except for the insulating ring 23 - as described under Figures 1 and 2, provided.
EP89118681A 1989-05-31 1989-10-07 Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren Withdrawn EP0400212A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893917680 DE3917680A1 (de) 1989-05-31 1989-05-31 Kraftstoff-luft-gemischbildungsvorrichtung fuer verbrennungsmotoren
DE3917680 1989-05-31

Publications (1)

Publication Number Publication Date
EP0400212A1 true EP0400212A1 (de) 1990-12-05

Family

ID=6381746

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89118681A Withdrawn EP0400212A1 (de) 1989-05-31 1989-10-07 Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren

Country Status (3)

Country Link
EP (1) EP0400212A1 (ja)
JP (1) JPH0396646A (ja)
DE (1) DE3917680A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1243774A3 (de) * 2001-03-23 2004-01-28 Robert Bosch Gmbh Beheizbare Drosselvorrichtung für Brennkraftmaschinen
DE102007037359A1 (de) 2007-08-08 2009-02-12 Deutsches Zentrum für Luft- und Raumfahrt e.V. Drosselvorrichtung für ein strömendes Medium

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9318951U1 (de) * 1993-11-30 1994-02-17 Kabisch Herbert Vorrichtung zur Herstellung von Gemischen aus Gasen und Flüssigkeiten, insbesondere von Luft und Brenn- und Kraftstoffen
GB0622565D0 (en) * 2006-11-13 2006-12-20 Airbus Uk Ltd Water scavenging system
DE102020118118A1 (de) 2020-07-09 2022-01-13 Audi Aktiengesellschaft Strahlpumpe sowie Antriebseinrichtung für ein Kraftfahrzeug

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008699A (en) * 1976-04-05 1977-02-22 Ford Motor Company Extended throttle bore multi-stage carburetor
FR2492001A2 (fr) * 1979-12-06 1982-04-16 Bosch Pierburg System Ohg Dispositif de formation du melange pour moteurs a combustion interne
EP0084639A2 (en) * 1982-01-27 1983-08-03 Keiun Kodo Variable venturi carburetor
DE3643882A1 (de) * 1986-12-22 1988-06-30 Vdo Schindling Kraftstoff-luft-gemischaufbereitungsvorrichtung fuer verbrennungsmotoren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008699A (en) * 1976-04-05 1977-02-22 Ford Motor Company Extended throttle bore multi-stage carburetor
FR2492001A2 (fr) * 1979-12-06 1982-04-16 Bosch Pierburg System Ohg Dispositif de formation du melange pour moteurs a combustion interne
EP0084639A2 (en) * 1982-01-27 1983-08-03 Keiun Kodo Variable venturi carburetor
DE3643882A1 (de) * 1986-12-22 1988-06-30 Vdo Schindling Kraftstoff-luft-gemischaufbereitungsvorrichtung fuer verbrennungsmotoren

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1243774A3 (de) * 2001-03-23 2004-01-28 Robert Bosch Gmbh Beheizbare Drosselvorrichtung für Brennkraftmaschinen
DE102007037359A1 (de) 2007-08-08 2009-02-12 Deutsches Zentrum für Luft- und Raumfahrt e.V. Drosselvorrichtung für ein strömendes Medium

Also Published As

Publication number Publication date
DE3917680A1 (de) 1991-01-17
JPH0396646A (ja) 1991-04-22

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