EP0220179B1 - Dispositif pour l'injection continue de carburant - Google Patents

Dispositif pour l'injection continue de carburant Download PDF

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Publication number
EP0220179B1
EP0220179B1 EP85903280A EP85903280A EP0220179B1 EP 0220179 B1 EP0220179 B1 EP 0220179B1 EP 85903280 A EP85903280 A EP 85903280A EP 85903280 A EP85903280 A EP 85903280A EP 0220179 B1 EP0220179 B1 EP 0220179B1
Authority
EP
European Patent Office
Prior art keywords
fuel
carrier air
injection
combustion engine
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.)
Expired
Application number
EP85903280A
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German (de)
English (en)
Other versions
EP0220179A1 (fr
Inventor
Peter Hofbauer
Jürgen SANDHAGEN
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.)
Volkswagen AG
Original Assignee
Volkswagen 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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP0220179A1 publication Critical patent/EP0220179A1/fr
Application granted granted Critical
Publication of EP0220179B1 publication Critical patent/EP0220179B1/fr
Expired 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/08—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the fuel being carried by compressed air into main stream of combustion-air

Definitions

  • the invention relates to a device for the continuous injection of fuel into the intake pipes of a multi-cylinder, mixture-compressing internal combustion engine according to the preamble of patent claim 1.
  • Such a fuel injection device is known for example from DE-A-2 920 636.
  • the carrier air is divided into injection lines leading to the individual intake pipes of the internal combustion engine, and the fuel is then injected into these carrier air injection lines, which are arranged separately from one another.
  • an injection device for a multi-cylinder internal combustion engine in which the fuel metered by a common metering valve is distributed in a cylindrical collecting space on the individual cylinders, and fuel injection lines which open into their intake pipes are distributed.
  • air from the intake line is admixed to these fuel injection lines with the aid of the injector principle.
  • Another injection device has, behind a common metering valve, a device containing a further valve for distributing the fuel to the individual fuel injection lines. However, there is no air supply to the fuel to be injected here.
  • the problem underlying the present invention is to be seen, starting from the known design according to DE-A-2 920 636, to provide an improved injection device which, with the most compact possible design, evenly distributes the fuel-air mixture to the individual cylinders of the internal combustion engine guaranteed cheaper processing.
  • 1 denotes a part of a conventional mixture-compressing internal combustion engine and 2 denotes an intake line system leading to this internal combustion engine, which has an intake manifold 2a and a number of intake pipes 2b assigned to the individual cylinders of internal combustion engine 1 .
  • 9 is an air pump and 4 is a fuel pump, which can either be driven separately or combined with a common drive motor assigned to these two pumps, for example formed by an electric motor, to form a structural unit.
  • the fuel pump 4 draws fuel from a fuel reservoir 3 and conveys it via a fuel line 24, in which a fuel filter 5 is arranged, to a fuel metering device formed by an injection valve 7, which, according to the signals of a control unit 10, is assigned to the respective operating state of the internal combustion engine Delivers fuel quantity.
  • the fuel is injected into a carrier air flow in a mixture formation and distribution device 8, which is supplied via a line 21 from the air pump 9, which is connected on the suction side to the intake line system 2 of the internal combustion engine 1.
  • the carrier air flow used to convey the fuel metered via the injection valve 7 into the cylinders of the internal combustion engine is thus branched off from the air flow drawn in by the internal combustion engine 1.
  • the metering of the fuel is carried out separately into partial carrier air streams previously divided into the individual cylinders of the internal combustion engine, which are then transported via individual injection lines 23 to the intake pipes 2b assigned to the cylinders of the internal combustion engine 1.
  • the mixture conveyed through the injection lines 23 is finally injected continuously in the vicinity of the inlet valves of the internal combustion engine 1 and brought into the combustion chambers with the main air flow when the inlet valves are open.
  • a branch line branching off from the delivery-side conveying air line 21 is indicated, which is connected to a fuel pressure regulator 6 which determines the pressure in the fuel line 24 and which conducts excess fuel via a return line into the fuel reservoir 3.
  • the control unit designated 10 controls the fuel metering Injection valve 7, inter alia, as a function of the amount of air drawn in by the internal combustion engine 1, for which purpose an air flow meter designated by 14 is provided in the intake line system 2, and also as a function of the temperature and the speed of the internal combustion engine, for which purpose corresponding sensors in the form of a cylinder block on the Internal combustion engine 1 arranged temperature sensor 11 and an ignition distributor designated 13 are indicated.
  • a sensor that determines the intake air temperature and is also connected to the control unit for signaling, as is a throttle valve switch 12 that detects the position of the throttle valve 17.
  • 20 is an additional air slide arranged in the intake line system 2, which serves to correct the amount of air supplied especially during warm-up bypassing the throttle valve indicated by 17, while 25 represents an idle speed adjustment screw and 26 an idle mixture adjustment screw.
  • 18 denotes an ignition start switch and 19 denotes a battery for the electrical power supply, which can be formed, for example, by the conventional on-board electrical system battery of a vehicle, while 16 denotes a relay combination via which the fuel pump 4 is actuated when the ignition start switch 18 is actuated and the air pump 9 are switched on.
  • the mixture formation and distribution device 8 is shown on an enlarged scale with an injection valve 7, which does not place the fuel centrally in a carrier air line common to all injection lines 23, but separately into individual cylinders, each connected to an injection line 23 and thus in each case one cylinder injected carrier air injection lines 29 associated with the internal combustion engine.
  • the distribution of the carrier air supplied via line 21 to the individual carrier air injection lines 29 takes place here in a ring-shaped carrier air collecting space 27 which is arranged concentrically to the injection valve 7, into which the carrier air line 21 coming from the air pump 9 opens and from which the carrier air Injection lines 29 go evenly distributed over the circumference.
  • the injection valve 7 has a head part 33, which is held in a valve housing 34 and has a valve body 35 which can be actuated by, for example, electromagnetic means, not shown here.
  • the carrier air injection lines 29 leading separately to the individual cylinders of the internal combustion engine as well as injection openings 36 associated therewith and each opening into these are incorporated, via which the fuel is supplied in quantities assigned to the individual cylinders.
  • the spray openings 36 can open into the carrier air injection lines 29 at those points where they have a nozzle-like constriction 28.
  • the supply of the fuel at such cross-sectional constrictions of the carrier air line has the advantage that the pressure level required for the injection of the fuel and to be applied by the fuel pump can be reduced by the higher air flow velocity occurring at these points (injector effect).
  • the spray openings 36 are aligned in such a way that they inject the fuel in the air flow direction, that is to say in the direction of the downstream ends of the carrier air injection lines 29. In this way, faster fuel transport is ensured even under unfavorable operating conditions and prevents the fuel from flowing back into the carrier air plenum counter to the direction of air flow and there can ensure an uneven distribution of fuel in the individual cylinders of the internal combustion engine.
  • FIG. 2 of the drawing 30 and 31 indicate separate housing parts of the mixture formation and distribution device 8, which are connected to one another or to the injection valve 7 with the interposition of sealing rings 32 and 37.
  • the fuel is not fed centrally into the carrier air at one point and only then is the carrier air / fuel mixture divided into the individual cylinders, but instead only the carrier air is initially applied the individual cylinders are divided and then the fuel, which is also metered separately onto the individual cylinders of the internal combustion engine, is fed into these carrier air partial flows through a single injection valve with a number of spray openings corresponding to the number of cylinders. Since the separate division of the individual phases, namely the gaseous phase of the carrier air and the liquid phase of the fuel, can be carried out much more easily than a division of a two-phase flow required after mixing, the fuel metering can be carried out much more precisely and uniformly here.
  • the injection openings of the injection valve can be designed so precisely that the same amount of fuel is dispensed from them.
  • the distribution of the carrier air to the individual phases is less critical, since small differences in the allocated quantities have no major impact on the running behavior of the Have internal combustion engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

Dispositif pour l'injection continue de carburant dans le tuyau d'admission d'un moteur à combustion interne, à plusieurs cylindres et à compression du mélange, avec une pompe à air (9) pour le transport d'un écoulement d'air porteur déviant du tuyau d'admission (2) et avec une pompe à carburant (4) transportant le carburant d'un récipient de réserve de carburant (3) à un dispositif de dosage (7) ajoutant le carburant en fonction de l'état de fonctionnement du moteur à combustion interne (1) à l'écoulement d'air porteur. Afin de déterminer le dosage le plus régulier et exacte possible du carburant pour les divers cylindres du moteur à combustion interne, il convient de prévoir des moyens pour répartir l'air porteur sur les conduites d'injection (29) d'air porteur attribuées séparément aux différents cylindres du moteur à combustion interne. En outre, le dispositif de dosage doit être formé de conduites de pulvérisation (36) adjointes séparément aux conduites d'injection d'air porteur (29) par une soupape d'injection (7) et débouchant dans celles-ci.

Claims (3)

1. Dispositif d'injection continue de carburant dans les tubes d'aspiration (26) d'un moteur à combustion interne (1) à plusieurs cylindres, compressant un mélange, comportant une pompe d'air (9) envoyant un courant d'air de support partant du conduit d'aspiration (2), ainsi qu'une pompe de carburant (4) qui envoie le carburant à partir d'un réservoir de carburant (3) vers un dispositif de dosage (7) ajoutant de manière dosée le carburant au courant d'air de support, en fonction de l'état de fonctionnement du moteur à combustion interne, des moyens étant prévus pour répartir le courant d'air de support entre les conduits d'injection d'air de support (29), associés séparément aux différents cylindres du moteur à combustion interne, et le dispositif de dosage (7), ayant la forme d'une soupape d'injection comportant un corps de soupape (35) réglable par rapport à un élément de tête (33), délivrant le carburant par des orifices de pulvérisation (36) séparés, débouchant dans les différents conduits d'injection de l'air de support, caractérisé en ce qu'il est prévu, dans l'élément de tête (33) de la soupape d'injection (7), un collecteur d'air de support (27) annulaire, entourant concentriquement la soupape d'injection (7), relié à la pompe d'air (9), collecteur duquel partent les différents conduits d'injection d'air de support (29), régulièrement répartis sur le pourtour.
2. Dispositif d'injection selon la revendication 1, caractérisé en ce que les orifices de pulvérisation (36) de la soupape d'injection (7) débouchent chacun dans des zones (28), rétrécies dans leur section transversale à la manière de buses, des conduits d'injection de l'air de support (29).
3. Dispositif d'injection selon la revendication 1 ou 2, caractérisé en ce que les orifices de pulvérisation (36) de la soupape d'injection (7) sont dirigés vers les extrémités aval des conduits d'injection de l'air de support (29).
EP85903280A 1984-07-13 1985-07-08 Dispositif pour l'injection continue de carburant Expired EP0220179B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3425856 1984-07-13
DE3425856 1984-07-13

Publications (2)

Publication Number Publication Date
EP0220179A1 EP0220179A1 (fr) 1987-05-06
EP0220179B1 true EP0220179B1 (fr) 1988-06-08

Family

ID=6240563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85903280A Expired EP0220179B1 (fr) 1984-07-13 1985-07-08 Dispositif pour l'injection continue de carburant

Country Status (4)

Country Link
US (1) US4690118A (fr)
EP (1) EP0220179B1 (fr)
DE (1) DE3563240D1 (fr)
WO (1) WO1986000669A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4709681A (en) * 1986-03-04 1987-12-01 Volkswagen Ag Fuel injection device
US4708117A (en) * 1986-04-14 1987-11-24 Colt Industries Inc. Multi-point fuel injection apparatus
US4840163A (en) * 1987-01-08 1989-06-20 Colt Industries Inc. Electromagnet, valve assembly and fuel metering apparatus
US4794901A (en) * 1987-06-16 1989-01-03 Industrial Technology Research Institute Low pressure air assisted fuel injection apparatus for engine
US5009212A (en) * 1990-01-17 1991-04-23 Mccord Winn Textron Inc. Port fuel injection and induction system for internal combustion engine
DE4007788A1 (de) * 1990-03-12 1991-09-19 Bosch Gmbh Robert Vorrichtung zur einspritzung eines brennstoff-gas-gemisches
GB2247917A (en) * 1990-09-14 1992-03-18 Ford Motor Co I.c.engine fuel and air intake system
JP2996525B2 (ja) * 1991-03-20 2000-01-11 株式会社日立製作所 燃料噴射弁
JP2573118Y2 (ja) * 1992-02-03 1998-05-28 国産電機株式会社 内燃機関用燃料噴射装置
JPH0666226A (ja) * 1992-08-11 1994-03-08 Mitsubishi Electric Corp 内燃機関の燃料噴射装置
US5474046A (en) * 1994-03-07 1995-12-12 Corona; Jose M. B. Fuel injection system
US5666927A (en) * 1996-07-26 1997-09-16 Siemens Automotive Corporation Fuel/air supply system for a fuel injector and methods of operation
CN103233837A (zh) * 2013-04-24 2013-08-07 安徽中鼎动力有限公司 一种燃油连续喷射装置

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE314252C (fr) *
DE274727C (fr) *
US1977200A (en) * 1930-04-19 1934-10-16 Robert Suczek Internal combustion engine
GB862718A (en) * 1959-04-15 1961-03-15 Continental Motors Corp Fuel injection system for internal combustion engines
GB1061829A (en) * 1964-12-07 1967-03-15 Bendix Corp Fuel injection systems for internal combustion engines
DE2033051A1 (de) * 1970-07-03 1972-01-05 Bosch Gmbh Robert Elektrisch gesteuerte Kraftstoffeinspritzeinrichtung
DE2638666A1 (de) * 1976-08-27 1978-03-02 Volkswagenwerk Ag Kraftstoff-einspritzeinrichtung
US4224915A (en) * 1978-04-19 1980-09-30 Volkswagenwerk Aktiengesellschaft Fuel injection apparatus
DE2900691A1 (de) * 1979-01-10 1980-07-24 Volkswagenwerk Ag Kraftstoff-einspritzeinrichtung
JPS5641452A (en) * 1979-09-12 1981-04-18 Toyota Central Res & Dev Lab Inc Fuel injection device of multicylinder internal combustion engine
DE3102266A1 (de) * 1981-01-24 1982-08-19 Pierburg Gmbh & Co Kg, 4040 Neuss Brennstoffversorgungseinrichtung
DE3366996D1 (en) * 1983-01-20 1986-11-20 Pierburg Gmbh & Co Kg Fuel-supply device for a mixture-compressing internal-combustion engine
JPS59131575U (ja) * 1983-02-23 1984-09-04 トヨタ自動車株式会社 電子制御機関用燃料噴射弁
IN160390B (fr) * 1983-05-19 1987-07-11 Wisdom Shirley A
DE3560960D1 (en) * 1984-05-29 1987-12-17 Volkswagen Ag Method for continuous fuel injection and device for carrying out the method

Also Published As

Publication number Publication date
EP0220179A1 (fr) 1987-05-06
DE3563240D1 (en) 1988-07-14
WO1986000669A1 (fr) 1986-01-30
US4690118A (en) 1987-09-01

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