EP0400210A1 - Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren - Google Patents

Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren Download PDF

Info

Publication number
EP0400210A1
EP0400210A1 EP89118677A EP89118677A EP0400210A1 EP 0400210 A1 EP0400210 A1 EP 0400210A1 EP 89118677 A EP89118677 A EP 89118677A EP 89118677 A EP89118677 A EP 89118677A EP 0400210 A1 EP0400210 A1 EP 0400210A1
Authority
EP
European Patent Office
Prior art keywords
fuel
nozzle
wall
rotationally symmetrical
internal combustion
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Withdrawn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
EP89118677A
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 EP0400210A1 publication Critical patent/EP0400210A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • F02M33/025—Means not otherwise provided for
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/56—Variable venturi

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 displaceable in it, forms a convergent-divergent nozzle which opens into a radial diffuser, and in the vicinity of the narrowest cross section of the nozzle around it circumferential and opening into this gap is provided, in 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 fuel supplied is in the white tere consequence atomized by the air mass flowing transversely to the fuel film, the resulting droplet size decreasing with increasing speed of the air mass flow.
  • the fuel flowing in the radial gap adheres to its walls as a result of adhesion and remains adhering to the walls of the same in a more or less strong film even after it has entered the divergent nozzle area of the nozzle body.
  • the nozzle opens into a strongly outwardly curved radial diffuser, with the result that the fuel film in the area of curvature detaches in the form of larger droplets due to the low air speed there and the centrifuging effect, 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 radial diffuser is formed by a region of the nozzle body which is curved outward in the direction of flow of the mixture and a wall, opposite the throttle body and rotationally symmetrical to the axis of rotation of the throttle body, of a component forming a structural unit with an intake manifold of the internal combustion engine, the wall has a curvature directed towards the throttle body.
  • the nozzle body is curved outwards from the narrowest cross section of the nozzle with minimal radii of curvature, if possible, and that the curvature directed towards the throttle body is curved so far with minimal radii of curvature in the direction of the throttle body that the diffuser function is caused by the Cooperation between the corresponding area of the nozzle body and the curved wall directed towards the throttle body is ensured.
  • the minimal radii of curvature of the area of the nozzle body and the wall ensure that there is no separation of the flow on the components flowing around and that the fuel film does not become detached in the form of larger droplets.
  • the outwardly curved region of the nozzle body is provided with a heating device.
  • 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 expediently being arranged in the immediate vicinity of the inner wall of the relevant section of the nozzle body, the fuel film on the inner wall evaporates almost completely, the more the stronger the wall of the nozzle body is heated.
  • the heating option thus further improves the aerodynamic advantages achieved by the special design of the radial diffuser. It is also considered appropriate, including the rotations to provide a symmetrical wall-mounted component with a heating device. This component can also be heated, for example, electrically and / or by a medium heated by the motor.
  • Reference number 1 denotes an imaginary longitudinal axis of the fuel-air mixture formation device, around which parts of this mixture formation device are formed symmetrically.
  • a nozzle body 2 with its inner wall 3 is essentially rotationally symmetrical.
  • the interior space delimited by the inner wall in the nozzle body tapers downwards continuously in its upper region 4 to a point at reference number 5 of the narrowest clear cross-section.
  • a radial diffuser 6 adjoins this at the bottom.
  • 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 and then at right angles to it radially outwards.
  • 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 widens 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 further the throttle body is moved 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.
  • air is introduced into the fuel gap under higher pressure, approximately 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 masses stream evenly over the circumference of the nozzle body and film-like.
  • the radial diffuser is thus formed by an area of the nozzle body which is curved outward in the flow direction of the mixture and by a wall 15 which is opposite the throttle body and is rotationally symmetrical with respect to the axis of rotation of the throttle body and has a curvature 16 directed towards the throttle body.
  • the wall 15 is part of a component 17, which forms a structural unit 18 with a suction pipe 7 of the internal combustion engine.
  • the figure shows in concrete terms that the nozzle body with the throttle body downstream of the gap opening 12 forms the divergent area of the nozzle, which opens into the radial diffuser, the passage cross section of which tapers continuously up to its radial outlet opening 19, which represents the transition to the suction pipe 7.
  • the required curvature of the wall 15 in the direction of the throttle body is dependent on the fluidic conditions.
  • the operation of the radial diffuser according to the invention which is intended to prevent the air from detaching from the wall 3, is supported in that, in the device shown, both the outwardly curved region of the nozzle body and the component having the wall 15 with a heating device 20 or 21 are provided.
  • the heating device 20 has a heating channel 22 which is arranged in the nozzle body in the region of its inner wall and is of annular design and thus the inner wall completely surrounds the diffuser.
  • the heating duct is provided with an engine cooling water inlet 23 and an opposite engine cooling water outlet 24, the diffuser is thus heated by the hot engine cooling water.
  • 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 nozzle body in the area of the fuel gap and the gap opening has a small wall thickness and an air-guiding cavity 25 which counteract undesired heating of the fuel, which ensures a high heating efficiency of the nozzle body in the area of the diffuser.
  • the heating causes the fuel film on the wall of the diffuser to evaporate almost completely.
  • the associated component 17 passes through a heating channel 26 with engine cooling water inlet 27 and engine cooling water outlet 28.
EP89118677A 1989-05-31 1989-10-07 Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren Withdrawn EP0400210A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3917681A DE3917681A1 (de) 1989-05-31 1989-05-31 Kraftstoff-luft-gemischbildungsvorrichtung fuer verbrennungsmotoren
DE3917681 1989-05-31

Publications (1)

Publication Number Publication Date
EP0400210A1 true EP0400210A1 (de) 1990-12-05

Family

ID=6381747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89118677A Withdrawn EP0400210A1 (de) 1989-05-31 1989-10-07 Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren

Country Status (4)

Country Link
US (1) US5012788A (ja)
EP (1) EP0400210A1 (ja)
JP (1) JPH0396648A (ja)
DE (1) DE3917681A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5245977A (en) * 1991-07-03 1993-09-21 Tecogen, Inc. Flow proportioning mixer for gaseous fuel and air and internal combustion engine gas fuel mixer system
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

Citations (3)

* 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
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1973362A (en) * 1932-05-13 1934-09-11 Weiertz Axel Hugo Carburetor
US2034048A (en) * 1932-09-28 1936-03-17 Leibing Automotive Devices Inc Carburetor
US2084340A (en) * 1933-04-18 1937-06-22 Ralph B Hartsough Carburetor for internal combustion engines
US2646264A (en) * 1949-09-07 1953-07-21 Su Carburetter Co Ltd Self-feeding carburetor for internal-combustion engines
US2572338A (en) * 1950-07-28 1951-10-23 Universal Oil Prod Co Autothermic cracking reactor
DE2058992A1 (de) * 1970-12-01 1972-06-08 Daimler Benz Ag In einem Ansaugkanal einer gemischverdichtenden Brennkraftmaschine angeordnetes axial bewegliches Drosselorgan

Patent Citations (3)

* 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
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

Also Published As

Publication number Publication date
DE3917681A1 (de) 1990-12-06
JPH0396648A (ja) 1991-04-22
US5012788A (en) 1991-05-07

Similar Documents

Publication Publication Date Title
EP2129888B1 (de) Ladefluidansaugmodul und verbrennungskraftmaschine
DE102012000543B4 (de) Abgasrückführungssystem für einen verbrennungsmotor
DE3032067C2 (ja)
EP0214251B1 (de) Ladungsdrall- und/oder -turbulenzeinrichtung für verbrennungsmotore
DE10116643C2 (de) Hubkolbenbrennkraftmaschine
DE69913149T2 (de) Katalysatorsystem für brennkraftmaschinen mit getrennter abfuhr und zwei katalysatoren
DE4119206A1 (de) Brennstoffeinspritzvorrichtung fuer brennkraftmaschinen
DE2319034A1 (de) Kraftstoffeinspritzvorrichtung fuer brennkraftmaschinen
DE2213124A1 (de) Vorrichtung zum Einspritzen von Kraftstoff in Brennkraftmaschinen
EP2370687A1 (de) Brennkraftmaschine
DE102009056544B4 (de) Verbrennungsmotor mit einem Turbolader und einer Rückführung für die Abgase
DE4420247B4 (de) Abgasrückführungseinrichtung für Verbrennungsmotoren, insbesondere mit Plastesaugrohren
DE2949096C2 (de) Gemischbildner für Brennkraftmaschinen
DE102013106748A1 (de) Verbessertes Mischen für die Abgasrückführung
EP1152125A1 (de) Verfahren und Vorrichtung zur Kühlung eines Einström-Wellenbereichs einer Dampfturbine
EP0400210A1 (de) Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren
DE3614115C2 (ja)
DE2753826A1 (de) Turbolader
EP0400212A1 (de) Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren
EP3473930B1 (de) Düse für eine brennkammer eines triebwerks
EP0263369B1 (de) Luftvorwärmvorrichtung für eine Brennkraftmaschine
DE2748407A1 (de) Kraftstoff-einspritzduese mit zugeordneter luftzufuhr
DE2712729A1 (de) Vorrichtung zur umlenkung eines abgasstromes
DE2743124A1 (de) Kraftstoffoerdervorrichtung fuer ueberschallstroemung im ansaugrohr eines verbrennungsmotors
DE19647301A1 (de) Verfahren zur Gemischbereitung für eine Otto-Brennkraftmaschine sowie Brennkraftmaschine zur Durchführung des Verfahrens

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19900911

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19910504

R18W Application withdrawn (corrected)

Effective date: 19910504