EP0193754B1 - Injection mécanique de carburant - Google Patents

Injection mécanique de carburant Download PDF

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Publication number
EP0193754B1
EP0193754B1 EP86101722A EP86101722A EP0193754B1 EP 0193754 B1 EP0193754 B1 EP 0193754B1 EP 86101722 A EP86101722 A EP 86101722A EP 86101722 A EP86101722 A EP 86101722A EP 0193754 B1 EP0193754 B1 EP 0193754B1
Authority
EP
European Patent Office
Prior art keywords
fuel
injection valve
injection
cylinder
central
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 - Lifetime
Application number
EP86101722A
Other languages
German (de)
English (en)
Other versions
EP0193754A2 (fr
EP0193754A3 (en
Inventor
Herbert Brockhaus
Fritz Dr. Naumann
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.)
Audi AG
Original Assignee
Audi 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 Audi AG filed Critical Audi AG
Priority to AT86101722T priority Critical patent/ATE57423T1/de
Publication of EP0193754A2 publication Critical patent/EP0193754A2/fr
Publication of EP0193754A3 publication Critical patent/EP0193754A3/de
Application granted granted Critical
Publication of EP0193754B1 publication Critical patent/EP0193754B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/52—Arrangement of fuel metering devices
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Definitions

  • the invention relates to a mechanical fuel injection according to the preamble of claim 1.
  • Such a fuel injection is installed under the trademark "Bosch K-Jetronic" as standard in a large number of motor vehicles. It is provided that, in addition to the injection valves assigned to each cylinder, a cold start enrichment valve is provided which additionally injects an additional total into an intake manifold section, which is assigned to all cylinders, during the cold start.
  • the object of the invention is to provide a generic fuel injection system which enables improved fuel metering when idling.
  • a central injection valve which injects fuel into the intake manifold and supplies all cylinders of the motor vehicle via this central injection at idle. Since the cylinder injection valves are then preferably switched off completely, the entire fuel quantity is supplied via the central injection, so that the fuel quantity to be supplied is a multiple (at least four times in the case of the four-cylinder engine) of the fuel quantity to be supplied otherwise by the individual cylinder injection valves.
  • the tolerance differences are not so important and the mixture preparation is significantly improved. The run speed can be further reduced to save fuel.
  • this amount of fuel is, as before, supplied decentrally to the individual cylinders via the cylinder injection valves.
  • the cylinder injection valves are completely closed when idling, so that the fuel supply takes place solely through the central injection valve. This allows the idling to be coordinated exactly.
  • the central injection valve which ensures the idle supply, can run along.
  • the central injection valve is preferably switched off at higher load states when the cylinder injection valves come into action.
  • the central injection valve can also run under partial and full load conditions and can be controlled to maintain the stoichiometric ratio, while the cylinder injection valves do not need to be controlled as well.
  • the AE control can thus be implemented structurally with reduced effort, since only the central injection valve is controlled by the control.
  • Fig. 1 denotes a cylinder of an internal combustion engine which has an inlet opening through which an inlet valve 12 in the open state allows a fuel-air mixture to enter.
  • a suction pipe which has a section 14, leads through to the cylinder, through which air is supplied, which is then divided into sections 16 in front of the individual cylinders.
  • section 16 that is to say in the sections individually assigned to each cylinder 12, there is an injection directly in front of the inlet valve 12 valve 17, which injects fuel via a line 36 upstream of the inlet valve.
  • the amount of air sucked in by an air inlet opening 20 is controlled by a throttle valve 18.
  • a cold start valve 32 which provides a cold start enrichment in a known manner by injecting fuel supplied via a line 30 into the intake manifold.
  • a mixture control device 22 is provided, which is installed in large numbers in series and is state of the art.
  • This mixture control system 22 has an air flow meter 24, which is formed by a baffle plate, in a known manner. The deflection of the air flow meter 24 controls the amount of fuel supplied to the cylinder injection valve 17 via the line 36.
  • an injection valve 44 for central injection of fuel is provided in the intake manifold section 14, that is to say in the intake manifold section which is common to all cylinders.
  • the optimal location is directly behind the throttle valve, where the swirling of the intake air is large and good mixing is guaranteed.
  • the injection directly at the downstream mouth of the bypass bypassing the throttle valve is ideal for idling.
  • the central injection valve 44 is connected via a fuel line 42 to a metering chamber in the mixture control system.
  • the fuel quantities to the cylinder injection valves 17 and the central injection valve 44 are controlled via a fuel quantity divider 40, which is shown in detail in FIG. 2.
  • the fuel quantity divider 40 contains a control piston 58 which is axially movable in a cylindrical bore 54 in a housing 52.
  • a system pressure 56 is applied to the piston 58 from one side, and the piston is raised or lowered in the axial direction by the air flow meter from the other side.
  • the piston has a collar 60 and 62 in the upper and lower region, each of which seals in the bore 54.
  • the piston 58 has a smaller diameter between the two collars 60 and 62.
  • a fuel supply line 64 opens into the bore 54 in the region of the smaller diameter, a fuel outflow 66 which opens into the line 36 for the cylinder injection valve 17 leads away from the bore 54.
  • the collar 60 closes the fuel drain line 66 completely or releases it to an increasing extent.
  • the line 42 which leads to the central injection valve 44, is connected in the fuel quantity divider to the connection 68, which through the collar 60 is optionally dependent on the position of the control piston. can be opened.
  • An incision 72 is provided in the collar 60, which ensures that the line 68 is supplied with fuel even in the idle position of the control piston.
  • the feed line 65 for the central injection valve is opened or closed by a projection 70 of the collar 62, depending on the position of the control piston, the inlet 65 being partially free in the idle position, so that it is connected to the outlet 68.
  • Fig. 2b shows the position of the control piston at partial load, it can be clearly seen that the projection 70 in this case already completely blocks the inlet 65 when the control piston is raised so that the central injection valve 44 no longer receives any fuel.
  • the cylinder injection valves are now connected to the fuel supply, and in the full-load position, as shown in FIG. 2 c, even more fuel flows to the cylinder injection valves 17.
  • a passive overlap of the central injection mode and the cylinder mode is desirable.

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)
  • Glass Compositions (AREA)
  • Lens Barrels (AREA)

Claims (5)

1. Système mécanique d'injection de carburant pour un moteur à combustion interne, comprenant une pompe de carburant, un accumulateur de carburant, un doseur de mélange (22) avec un distributeur de débit de carburant (40) qui, par un déplacement commandé par le débitmetre d'air (24), ouvre une amenée de carburant vers des injecteurs (17, 32, 44) par des fentes de dosage incorporées, un injecteur de cylindre (17) étant associé à chaque cylindre du moteur à combustion interne, le système comprenant en outre un injecteur central de départ à froid (32) pour l'enrichissement au départ à froid et un débitmètre d'air (24) qui est associé au doseur de mélange et qui commande le distributeur de débit de carburant (40), caractérisé en ce qu'il est prévu, dans un tronçon du collecteur d'admission (14) commun à tous le cylindres, un autre injecteur central de carburant (44) qui délivre du carburant en quantité prédéfinissable lors de la marche au ralenti, et en ce que les fentes de dosage pour tous les injecteurs de cylindre (17) sont complètement fermées lors de la marche au ralenti et il est prévu, pour l'injecteur central (44), une fente de dosage supplémentaire qui s'ouvre au moins lors de la marche au ralenti.
2. Système d'injection de carburant selon la revendication 1, caractérisé en ce que l'injecteur central (44) est disposé en aval du papillon des gaz (18), à proximité immediate de celui-ci.
3. Système d'injection de carburant selon la revendication 2, caractérisé en ce que l'injecteur central (44) est disposé à proximite immédiate de la dérivation de ralenti du papillon des gaz.
4. Système d'injection de carburant selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'en cas de moteur en V, un injecteur central est prévu dans chacune des deux branches d'admission de mélange.
5. Utilisation du système d'injection de carburant selon l'une quelconque des revendications 1 à 4 pour la commande ou le réglage du rapport stoechiométrique du mélange air-carburant, dans lequel l'injecteur central est commandé.
EP86101722A 1985-03-08 1986-02-11 Injection mécanique de carburant Expired - Lifetime EP0193754B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86101722T ATE57423T1 (de) 1985-03-08 1986-02-11 Mechanische kraftstoffeinspritzung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3508224 1985-03-08
DE19853508224 DE3508224A1 (de) 1985-03-08 1985-03-08 Mechanische kraftstoffeinspritzung

Publications (3)

Publication Number Publication Date
EP0193754A2 EP0193754A2 (fr) 1986-09-10
EP0193754A3 EP0193754A3 (en) 1989-05-10
EP0193754B1 true EP0193754B1 (fr) 1990-10-10

Family

ID=6264561

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101722A Expired - Lifetime EP0193754B1 (fr) 1985-03-08 1986-02-11 Injection mécanique de carburant

Country Status (3)

Country Link
EP (1) EP0193754B1 (fr)
AT (1) ATE57423T1 (fr)
DE (1) DE3508224A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006079172A1 (fr) * 2005-01-27 2006-08-03 Orbital Engine Company (Australia) Pty Limited Systeme d’injection de carburant pour moteur a combustion interne

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418672A (en) * 1980-03-06 1983-12-06 Robert Bosch Gmbh Fuel supply system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1229914A (fr) * 1967-09-04 1971-04-28
DE2337198C2 (de) * 1973-07-21 1981-09-17 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur Verminderung der schädlichen Anteile des Abgases
DE2737849C2 (de) * 1977-08-23 1984-11-29 Volkswagenwerk Ag, 3180 Wolfsburg Mehrzylindrige Otto-Brennkraftmaschine
DE3344596C2 (de) * 1983-12-09 1985-11-14 Daimler-Benz Ag, 7000 Stuttgart Kraftstoffeinspritzanlage für gemischverdichtende, fremdgezündete Brennkraftmaschinen
DE3511997A1 (de) * 1985-04-02 1986-10-09 Volkswagen AG, 3180 Wolfsburg Anordnung fuer fahrzeuge, insbesondere personenkraftfahrzeuge

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418672A (en) * 1980-03-06 1983-12-06 Robert Bosch Gmbh Fuel supply system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
AUTOMOBILTECHNISCHE ZEITSCHRIFT, Band 75, Nr. 11, November 1973, Seiten 393-398, Stuttgart, R. Schwartz et al.: "K-Jetronic-kontinuierliche Benzineinspritzung von Bosch" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006079172A1 (fr) * 2005-01-27 2006-08-03 Orbital Engine Company (Australia) Pty Limited Systeme d’injection de carburant pour moteur a combustion interne

Also Published As

Publication number Publication date
EP0193754A2 (fr) 1986-09-10
ATE57423T1 (de) 1990-10-15
DE3508224A1 (de) 1986-09-11
EP0193754A3 (en) 1989-05-10
DE3508224C2 (fr) 1987-02-05

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