WO2008043755A1 - Système d'alimentation en carburant - Google Patents

Système d'alimentation en carburant Download PDF

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Publication number
WO2008043755A1
WO2008043755A1 PCT/EP2007/060705 EP2007060705W WO2008043755A1 WO 2008043755 A1 WO2008043755 A1 WO 2008043755A1 EP 2007060705 W EP2007060705 W EP 2007060705W WO 2008043755 A1 WO2008043755 A1 WO 2008043755A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
branch
supply system
line
pump
Prior art date
Application number
PCT/EP2007/060705
Other languages
German (de)
English (en)
Inventor
Matthias Knüppe
Original Assignee
Continental Automotive Gmbh
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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2008043755A1 publication Critical patent/WO2008043755A1/fr

Links

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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/20—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting means
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/27—Fuel-injection apparatus with filters
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the present invention relates to a fuel supply system for an internal combustion engine according to independent claim 1.
  • Connectors such as quick-fit connections
  • Quick-Fit connections are easy to handle.
  • a disadvantage is a lack of tightness, especially when the connecting components as described above have a low temperature.
  • air bubbles often enter the fuel via Quick-Fit connections.
  • the inclusion of air bubbles in the fuel to be supplied to an internal combustion engine has, on the one hand, the disadvantage that the quantity of fuel supplied to the internal combustion engine varies on account of the trapped volumes of the air bubbles.
  • the air bubbles also lead to significant pressure fluctuations and pressure drops in the fuel supply system. Particularly in internal combustion engines with fuel injection and even more in direct fuel injection, the pressure fluctuations and pressure drops lead to considerable inaccuracies of the injection quantities.
  • the present invention is therefore based on the object of avoiding that the air bubbles present in the fuel reach the combustion chamber of the internal combustion engine.
  • the fuel supply system which comprises a fuel pump, a supply line and a return line
  • fuel can be supplied to the fuel pump via the supply line.
  • a branch which is arranged in the supply line
  • at least a part of the fuel via the return line to a fuel flow in the direction of the branch disposed part of the supply line can be fed again.
  • the fuel supply system comprises a bubble separation device, which is arranged in the branch. The bubble separation device prevents air bubbles contained in fuel in a fuel flow direction upstream of the branch portion of the supply line from entering a fuel flow direction downstream of the branch portion of the supply line.
  • Disturbing air bubbles in fuel typically have a diameter of between 0.5 mm and 10 mm. The larger a bubble is, the stronger is its disruptive influence in the air
  • Einspritsystem Therefore, it is advantageous to use a grid or other bubble separation device having pores with an extension which is smaller than 1 mm, preferably smaller than 0.5 mm.
  • a further advantageous embodiment provides a bubble separation device, which has pores with an expansion which is greater than 0.05 mm, preferably greater than 0.1 mm.
  • the fuel tank for example, air bubbles enter the fuel due to vibrations of the internal combustion engine or the travel of a vehicle.
  • a fuel tank also contains a tank ventilation system, the air bubbles can also be released from the fuel contained in the fuel tank back to the environment, so that sets a balance.
  • the return line opens into a fuel tank, the high-bubble fuel returns to the fuel tank, where the air bubbles through the tank ventilation system can escape from the fuel supply system.
  • a separate venting system can be provided in the return line, via which air bubbles are discharged the fuel supply system to be sent to the environment.
  • High pressure pumps are particularly susceptible to pressure fluctuations due to air entrapment of air due to the high compressibility of air.
  • the invention is particularly suitable for operating a fuel pump, which is designed as a high-pressure pump.
  • the problem of the compressibility of air is exacerbated once again when the high-pressure pump is connected to an accumulator on the high-pressure side.
  • advantageous synergy effects of the invention result with the combined use of a fuel supply system according to the invention for a common rail system.
  • Figure 1 is a fuel supply system
  • FIG. 1 shows a fuel supply system 100, which comprises a fuel tank 1, a pump system 4 and an injection system 20.
  • the fuel tank is connected to the pump system 4 via a line 2, in which a fuel filter 3 is arranged.
  • the pump system 4 comprises a prefeed pump 5 mechanically driven by a shaft 8, a pressure limiting valve 6, a volumetric flow control valve 10 (VCV), a high pressure pump 13 also driven by the shaft 8, a high pressure filter 17 and a high pressure relief valve 18.
  • the volumetric flow control valve 10 is preferably an electrical operated proportional 3/2 way valve (3 connections, two switching positions).
  • the injection system 20 is designed as a common rail system. It comprises a pressure accumulator 21 and at least one injector 22.
  • Fuel is conveyed from the fuel tank 1 to the pump system 4 via the line 2 by means of the prefeed pump 5 from the fuel tank 1.
  • the fuel filter 3 is connected in the line 2. So that the prefeed pump 5 on the output side does not generate too high a pressure, the pressure limiting valve 6 is arranged at the outlet of the prefeed pump, via which fuel can be discharged into the line 2.
  • the feed line 7 has a branch 9, to which a return line 11 is connected. Through the return line 11, fuel is supplied to the high pressure pump 13 to cool and lubricate.
  • the return line 11 opens into the fuel tank. 1
  • the high-pressure outlet of the high-pressure pump 13 is connected to the pressure accumulator 21 via the high-pressure line 14.
  • About the high pressure filter 17 and the high pressure relief valve 18 can fuel from the high pressure line 14 in the return line
  • the injector 22 which is connected to the pressure accumulator 21 injections can be made in the combustion chamber of an internal combustion engine. So that excess fuel can be removed from the injector, the injector has a valve, by means of which fuel is passed via the line 23 back into the tank.
  • FIG. 2 shows a tee or a branch 7, which corresponds to the prior art. Visible is the supply line 7, from which the return line 11 leads away.
  • the supply line 7 is subdivided into a part 7a arranged upstream of the branch in the fuel flow direction and into a part 7b arranged in the direction of fuel flow after the branching.
  • the fuel flow direction is indicated in the different regions of the branch 7 by arrows. Due to the flow of the fuel, air bubbles 19 are present in all lines and sub-lines 7, 7a, 7b, 9, 11.
  • FIG. 3 shows the branch 9 in which a bubble separation device 12 designed as a grid is arranged.
  • FIG. 3, in combination with FIG. 1, represents an embodiment of the invention.
  • the grid 12 is perpendicular to the feed line 7.
  • air bubbles 19 contained in fuel are prevented from reaching a part 7b of the supply pipe 7b arranged in the fuel flow direction after the branching in a part 7a of the supply pipe arranged in the fuel flow direction before the branching.
  • the air bubbles are discharged via the return line. This will prevent the air bubbles in the high-pressure pump and the injection system located downstream of the high-pressure pump are compressed. As a result, very stable pressure conditions can be achieved in the injection system.
  • FIG. 4 shows the branch 9 which, in combination with FIG. 1, discloses a further embodiment of the invention.
  • a flat grid 12 is disposed at an inclined angle to the feed line 7. This ensures that the air bubbles 19 are more easily torn by the flow in the return line 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Pour éliminer les bulles d'air dans le carburant qui doit être amené à un moteur à combustion interne avant que le carburant n'atteigne le moteur à combustion interne, il est proposé selon l'invention un nouveau système (100) d'alimentation en carburant. Ce dernier comprend une pompe à carburant (5, 13), un conduit d'amenée (7) et un conduit de retour (11). Le carburant peut être amené à la pompe à carburant (5, 13) par le conduit d'amenée (7). Une ramification (9) disposée dans le conduit d'amenée (7) permet de ramener une partie du carburant par le conduit de retour (11) dans une partie (7a) du conduit d'amenée (7) disposée en amont de la ramification (9) dans la direction d'écoulement du carburant. Dans la ramification (9) est disposé un dispositif (12) de séparation des bulles qui empêche les bulles d'air (19) que contient le carburant dans la partie (7a) du conduit d'amenée (7) disposée en amont de la ramification (9) dans la direction d'écoulement du carburant de passer dans une partie (7b) du conduit d'amenée (7) disposée en aval de la ramification (9) dans la direction d'écoulement du carburant.
PCT/EP2007/060705 2006-10-10 2007-10-09 Système d'alimentation en carburant WO2008043755A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610047976 DE102006047976A1 (de) 2006-10-10 2006-10-10 Kraftstoffversorgungssystem
DE102006047976.9 2006-10-10

Publications (1)

Publication Number Publication Date
WO2008043755A1 true WO2008043755A1 (fr) 2008-04-17

Family

ID=38924375

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/060705 WO2008043755A1 (fr) 2006-10-10 2007-10-09 Système d'alimentation en carburant

Country Status (2)

Country Link
DE (1) DE102006047976A1 (fr)
WO (1) WO2008043755A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20082209A1 (it) * 2008-12-12 2010-06-13 Bosch Gmbh Robert Impianto e metodo per alimentare combustibile fra un serbatoio ed un motore a combustione interna
ITMI20091355A1 (it) * 2009-07-29 2011-01-30 Bosch Gmbh Robert Impianto di alimentazione carburante ad un motore a combustione interna
WO2014016181A1 (fr) * 2012-07-24 2014-01-30 Continental Automotive Gmbh Système d'injection pour moteur à combustion interne

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8702074U1 (de) * 1987-02-11 1987-04-30 Schwefer, Hans Jürgen, Dipl.-Ing., 5100 Aachen Einrichtung an einem Fahrzeug mit einem nachtankbaren Behälter für kohlenwasserstoffhaltige Fluide
JPH05157014A (ja) * 1991-12-09 1993-06-22 Toyota Motor Corp ディーゼル機関の気泡排出装置
DE19823003A1 (de) * 1997-06-19 1998-12-24 Volkswagen Ag Fördereinheit für Flüssigkeiten, insbesondere Kraftstoff-Förder- oder Ölpumpen von Verbrennungsmotoren
EP1088984A2 (fr) * 1999-09-30 2001-04-04 Siemens Aktiengesellschaft Système d'injection pour un moteur à combustion interne
EP1215390A1 (fr) * 2000-12-14 2002-06-19 Filtrauto Dispositif d'alimentation en carburant pour moteur à combustion interne et filtre à carburant pour un tel dispositif
DE202005017702U1 (de) * 2005-09-19 2006-03-09 Tögel, Herwig Vorrichtung zum Betreiben eines Dieselmotors mit Kraftstoffen auf pflanzlichen Ölen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7182869B2 (en) * 2004-10-07 2007-02-27 Ti Group Automotive Systems, L.L.C. Fuel filter arrangement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8702074U1 (de) * 1987-02-11 1987-04-30 Schwefer, Hans Jürgen, Dipl.-Ing., 5100 Aachen Einrichtung an einem Fahrzeug mit einem nachtankbaren Behälter für kohlenwasserstoffhaltige Fluide
JPH05157014A (ja) * 1991-12-09 1993-06-22 Toyota Motor Corp ディーゼル機関の気泡排出装置
DE19823003A1 (de) * 1997-06-19 1998-12-24 Volkswagen Ag Fördereinheit für Flüssigkeiten, insbesondere Kraftstoff-Förder- oder Ölpumpen von Verbrennungsmotoren
EP1088984A2 (fr) * 1999-09-30 2001-04-04 Siemens Aktiengesellschaft Système d'injection pour un moteur à combustion interne
EP1215390A1 (fr) * 2000-12-14 2002-06-19 Filtrauto Dispositif d'alimentation en carburant pour moteur à combustion interne et filtre à carburant pour un tel dispositif
DE202005017702U1 (de) * 2005-09-19 2006-03-09 Tögel, Herwig Vorrichtung zum Betreiben eines Dieselmotors mit Kraftstoffen auf pflanzlichen Ölen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20082209A1 (it) * 2008-12-12 2010-06-13 Bosch Gmbh Robert Impianto e metodo per alimentare combustibile fra un serbatoio ed un motore a combustione interna
ITMI20091355A1 (it) * 2009-07-29 2011-01-30 Bosch Gmbh Robert Impianto di alimentazione carburante ad un motore a combustione interna
WO2011012402A1 (fr) * 2009-07-29 2011-02-03 Robert Bosch Gmbh Système d’alimentation en carburant pour moteur à combustion interne
US8851051B2 (en) 2009-07-29 2014-10-07 Robert Bosch Gmbh Fuel supply system for an internal combustion engine
WO2014016181A1 (fr) * 2012-07-24 2014-01-30 Continental Automotive Gmbh Système d'injection pour moteur à combustion interne
US10174735B2 (en) 2012-07-24 2019-01-08 Continental Automotive Gmbh Injection device for an internal combustion engine

Also Published As

Publication number Publication date
DE102006047976A1 (de) 2008-05-15

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