EP0416202A2 - Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren - Google Patents

Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren Download PDF

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Publication number
EP0416202A2
EP0416202A2 EP90107906A EP90107906A EP0416202A2 EP 0416202 A2 EP0416202 A2 EP 0416202A2 EP 90107906 A EP90107906 A EP 90107906A EP 90107906 A EP90107906 A EP 90107906A EP 0416202 A2 EP0416202 A2 EP 0416202A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
throttle body
fuel
interior
air
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Withdrawn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
EP90107906A
Other languages
German (de)
English (en)
French (fr)
Inventor
Uwe Neutzer
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 EP0416202A2 publication Critical patent/EP0416202A2/de
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
    • F02M19/02—Metering-orifices, e.g. variable in diameter
    • F02M19/0228—Ring nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

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 therein, forms a convergent-divergent nozzle which opens into an intake manifold of the internal combustion engine, a fuel air gap rotating around the convergent-divergent nozzle opens into the nozzle with a circumferential gap opening and fuel mixed with air is injected from the gap opening approximately transversely to the direction of the main air mass flow into the nozzle.
  • Such a mixture formation device is known from DE 36 43 882 A1.
  • the air mass flow is controlled by means of the throttle body, with a more or less large negative pressure being established in the intake manifold and thus on the wall of the throttle body, depending on the load condition of the engine. This causes closing forces on the throttle body, which must be applied when the throttle body is opened.
  • the object of the invention is to develop a mixture formation device of the type mentioned so that a compensation of the closing forces caused by the negative pressure on the throttle body is achieved.
  • the throttle body has an interior sealed off from the nozzle and is provided with at least one pressure compensation recess connecting the nozzle to the interior.
  • the pressure in the area of the nozzle thus reaches the closed interior of the throttle body via the pressure compensation recess and, due to its opposite direction of action to the pressure acting outside the throttle body, causes pressure compensation and - depending on the size of the effective area in the interior of the throttle body - a compensation of the closing forces.
  • the size of the active surface should be selected so that low closing forces are still present on the engine, regardless of the installation position of the mixture formation device. If necessary, forces introduced into the throttle body by restoring means must also be taken into account.
  • the throttle body is axially displaceably mounted in the inflow region of the nozzle on a guide element mounted centrally to the nozzle in the housing of the device, the interior of the hollow body being designed as a bearing-side recess in the throttle body, with a sealing element between the Throttle body and housing.
  • the throttle body is thus sealed off from the inflow region of the nozzle via a separate sealing element, which is advantageously designed as a rolling diaphragm, bellows or the like.
  • the pressure compensation recess is advantageously designed as a pressure compensation bore.
  • the figure shows a longitudinal section through the fuel-air mixture formation device according to the invention for a gasoline engine in the region of the nozzle body and throttle body and the associated housing section, the left half of the figure illustrating the device when the throttle body is in the idle position and the right half in the full load position.
  • an imaginary longitudinal axis of the fuel-air mixture formation device for the gasoline engine, around which parts of this mixture formation device are formed symmetrically, is designated by 1.
  • a nozzle body 2 with its inner wall 3 is shaped essentially rotationally symmetrically.
  • the interior space delimited by the inner wall in the nozzle body tapers from its lower region 4 upwards continuously to a point with the narrowest clear cross-section.
  • This is followed at the top by a diffuser 5, which opens into a suction pipe (not shown) of the internal combustion engine.
  • the fuel-air mixture formation device is acted upon by air through the openings 6 via an air filter (also not shown).
  • the main air mass flow therefore flows in the direction of arrow L from bottom to top.
  • a throttle body 7, likewise rotationally symmetrical about the longitudinal axis 1, is used, which can be adjusted in the direction of the longitudinal axis according to double arrow A.
  • the throttle body 7 is essentially a cone with an upward Tip 8 formed, it also has a cylindrical neck 9 below.
  • the nozzle body 2 forms, together with the throttle body 7, a convergent-divergent nozzle 10 with a narrowest cross section that is variable due to the adjustment possibility of the throttle body 7.
  • the nozzle body 2 is divided into an upper nozzle body part 2a and a lower nozzle body part 2b in the area of the variable narrowest nozzle cross section. Between them a fuel air gap 11 is formed, which opens into the nozzle 10 via a circumferential gap opening 12, with fuel mixed with air being injected from the gap opening approximately transversely to the direction of the main air mass flow L into the nozzle 10.
  • the lower nozzle body part 2b is provided with a fuel supply bore 13 which merges into a fuel ring channel 14 arranged in the nozzle body part 2b in a rotationally symmetrical manner with respect to the longitudinal axis 1 and which opens into the fuel air gap 11 via a fuel gap 15 connected to it.
  • the air supply takes place via at least one bore 16 in the upper nozzle body part 2a, which opens into an air ring channel 17 which is likewise arranged rotationally symmetrically with respect to the longitudinal axis 1 and which is connected to the fuel air gap 11.
  • the throttle body 7 is guided via a guide tube 18 arranged concentrically to the longitudinal axis 1, which is fixedly connected to a housing part 34 receiving the nozzle body 2, which is located below the throttle body 7 and the openings 6 for the main air mass flow L and is part of the housing of the mixture formation device is.
  • the housing part 34 is provided with a bore arranged concentrically to the longitudinal axis 1, into which the guide tube 18 is pressed is.
  • the tapered half of the throttle body 7 is provided with a corresponding bore 19 which passes through the guide tube 18 in such a way that the throttle body 7 can be moved on the guide tube 18 between the two positions shown.
  • the throttle body 7, starting from the bore 19, has a central bore into which a flexible rod 20 is inserted and soldered to the throttle body 7.
  • the end of the rod 20 facing away from the tip 8 of the throttle body 7 is connected in an articulated manner to a lever 21 which is pivotably mounted below the outlet opening of the guide tube 18 at a distance from the longitudinal axis 1 in the housing part 34.
  • Reference numbers 22 and 23 denote the fastening points of rod 20 and lever 21 or lever 21 and housing part 34.
  • the housing part 34 has a flange element 24 concentric to the longitudinal axis 1 at a distance from the guide tube 18, which covers the cylindrical shoulder 9 on the inside in each operating position of the throttle body 7.
  • One end of a rolling diaphragm 25 is clamped between the flange element 24 and the housing part 34, the other end of which is fixed between the cylindrical projection 9 and a clamping ring 26 surrounding it.
  • the sealing of the lower, open end of the throttle body 7 by means of the rolling diaphragm 25 serves, in cooperation with a bore 28, which is introduced into the conical region of the throttle body 7 and opens into the interior 27 of the throttle body 7, to relieve the pressure of the throttle body 7 at the variable, due to the negative pressure Closing forces caused in the system.
  • the Bore 28 thus causes pressure equalization between the nozzle 10 and the interior 27 of the throttle body 7.
  • the respective pressure force-transmitting surfaces projected in the arrow directions A are to be coordinated with one another in such a way that only small closing forces act on the throttle body 7 when the pressure equalization problem is taken into account.
  • the inside diameter of the cylindrical extension 9 corresponds approximately to the inside diameter of the nozzle body 2 in the area of the gap opening 2 and the bore 28 opens out at a distance from the longitudinal axis 1 which corresponds approximately to the smallest distance of the nozzle body 2 from the longitudinal axis 1, into the nozzle 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Fuel-Injection Apparatus (AREA)
EP90107906A 1989-09-08 1990-04-26 Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren Withdrawn EP0416202A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3929838A DE3929838A1 (de) 1989-09-08 1989-09-08 Kraftstoff-luft-gemischbildungsvorrichtung fuer verbrennungsmotoren
DE3929838 1989-09-08

Publications (1)

Publication Number Publication Date
EP0416202A2 true EP0416202A2 (de) 1991-03-13

Family

ID=6388882

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90107906A Withdrawn EP0416202A2 (de) 1989-09-08 1990-04-26 Kraftstoff-Luft-Gemischbildungsvorrichtung für Verbrennungsmotoren

Country Status (6)

Country Link
US (1) US5029564A (pt)
EP (1) EP0416202A2 (pt)
JP (1) JPH03172569A (pt)
AU (1) AU5683690A (pt)
BR (1) BR9004058A (pt)
DE (1) DE3929838A1 (pt)

Families Citing this family (8)

* 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, 51377 Leverkusen Vorrichtung zur Herstellung von Gemischen aus Gasen und Flüssigkeiten, insbesondere von Luft und Brenn- und Kraftstoffen
US5718205A (en) * 1996-06-27 1998-02-17 Kia Motors Corporation Fuel injection system with variable injection position
JPH11350981A (ja) * 1998-06-11 1999-12-21 Aisan Ind Co Ltd スロットル弁制御装置
US6264175B1 (en) * 1999-11-16 2001-07-24 Ming Ching Wang Automatic adjustment carburetor offering fuel economy and low pollution
DE10149673A1 (de) * 2001-10-09 2003-04-24 Bosch Gmbh Robert Vorrichtung zur Entlüftung von Komponenten im Ansaugtrakt einer Verbrennungskraftmaschine
US7128059B2 (en) * 2004-01-13 2006-10-31 Mahle Technology, Inc. Air induction system and evaporative emissions control device
US10082092B2 (en) * 2014-04-03 2018-09-25 Ford Global Technologies, Llc Method and system for vacuum generation using a throttle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2836215A1 (de) * 1978-08-18 1980-03-06 Bosch Gmbh Robert Kraftstoffversorgungsanlage
JPS60192846A (ja) * 1984-03-15 1985-10-01 Nissan Motor Co Ltd 内燃機関の燃料供給装置
JPS6327542A (ja) * 1986-07-22 1988-02-05 Kawaguchi Kagaku Kogyo Kk ゴム組成物
DE3643882A1 (de) * 1986-12-22 1988-06-30 Vdo Schindling Kraftstoff-luft-gemischaufbereitungsvorrichtung fuer verbrennungsmotoren

Also Published As

Publication number Publication date
JPH03172569A (ja) 1991-07-25
BR9004058A (pt) 1991-09-03
AU5683690A (en) 1991-03-14
DE3929838A1 (de) 1991-03-14
US5029564A (en) 1991-07-09

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