WO2008077904A1 - Système d'injection pour un moteur à combustion interne - Google Patents

Système d'injection pour un moteur à combustion interne Download PDF

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Publication number
WO2008077904A1
WO2008077904A1 PCT/EP2007/064386 EP2007064386W WO2008077904A1 WO 2008077904 A1 WO2008077904 A1 WO 2008077904A1 EP 2007064386 W EP2007064386 W EP 2007064386W WO 2008077904 A1 WO2008077904 A1 WO 2008077904A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
pump
pressure pump
injection system
control valve
Prior art date
Application number
PCT/EP2007/064386
Other languages
German (de)
English (en)
Inventor
Uwe Jung
Christoph Klesse
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 WO2008077904A1 publication Critical patent/WO2008077904A1/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
    • 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
    • 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
    • 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
    • F02M63/023—Means for varying pressure in common rails

Definitions

  • the invention relates to an injection system for an internal combustion engine.
  • injection systems For injecting fuel into the combustion chambers of an internal combustion engine, in particular a diesel internal combustion engine, injection systems are used, which in recent years are increasingly designed as so-called “common rail" systems
  • the fuel to be injected is present in the fuel reservoir at a pressure of up to 2000 bar.
  • Injection systems for internal combustion engines usually have different pumps, by means of which fuel is conveyed to be introduced into combustion chambers of the internal combustion engine.
  • Such injection systems for internal combustion engines place high demands on the accuracy of the injection pressure required for injecting the fuel into the combustion chambers of the internal combustion engine.
  • soot is highly dependent on the preparation of the air / fuel mixture in the respective cylinder of the internal combustion engine.
  • the injection system can achieve a high accuracy of the injection pressure of the fuel into the combustion chambers of the internal combustion engine with suitable control and regulating units.
  • an injection system for an internal combustion engine with a prefeed pump, can be promoted with the fuel from a fuel tank to the suction side of a high-pressure pump.
  • One of the feed pump hydraulically downstream high-pressure pump then delivers fuel into a fuel tank, from where it can then be distributed to the hydraulically coupled to the fuel injectors.
  • a control valve is arranged, through which a fuel flow from the fuel tank to the pre-feed pump can be adjusted. With suitable control of the control valve can be achieved in the fuel storage a predetermined, dependent on the operating parameters of the engine pressure.
  • the invention has for its object to provide an injection system of the type described above, which allows a high accuracy of the injection pressure of the fuel in the combustion chambers of the internal combustion engine and a simple structure of the injection system.
  • the invention is characterized by an injection system for an internal combustion engine, with at least one injector coupled to a fuel reservoir, a prefeed pump for conveying fuel from a fuel tank, a high-pressure pump downstream of the prefeed pump for conveying the fuel into the fuel accumulator, a volumetric flow control valve hydraulically arranged between the prefeed pump and the high-pressure pump, with which the fuel flow from the prefeed pump into the high-pressure pump is adjustable, and a volumetric flow control valve downstream downstream vent valve which is configured and arranged to discharge gases trapped upstream of the high pressure pump in the fuel.
  • venting valve is designed and arranged such that the gases enclosed in the fuel can be discharged from the injection system, in particular in such a way that the gases enclosed in the fuel can be kept away from the high-pressure pump.
  • the venting valve is arranged in a downstream of the volume flow control valve and upstream of the high-pressure pump branching line. This has the advantage that gases in the fuel can be safely removed from the injection system before reaching the high-pressure pump.
  • the conduit branching downstream of the volume flow control valve and upstream of the high pressure pump is hydraulically coupled to the fuel tank. This is particularly advantageous because so trapped in the fuel gases can be safely removed from the injection system in the fuel tank.
  • the vent valve is arranged in the direction of gravity above the at least the high-pressure pump. It can thereby be achieved that gases trapped in the fuel and already reached the high pressure pump can be safely removed from the high pressure pump and / or the entry of gases trapped in the fuel into the high pressure pump can be prevented.
  • the prefeed pump and the high pressure pump constructively form a pump unit, and the conduit branching downstream of the volumetric flow control valve and upstream of the high pressure pump, in which the vent valve is disposed, is disposed within the pump unit.
  • the conduit branching downstream of the volumetric flow control valve and upstream of the high pressure pump, in which the vent valve is disposed is disposed within the pump unit.
  • vent valve a Having opening which is formed so that when used according to the injection system, a fuel mass flow through the opening is feasible, which corresponds to a fuel leakage mass flow of the flow control valve. In this way it is possible to dispense with a leak-free design of the volume flow control valve, and dissipate the fuel leakage mass flow through the opening of the vent valve.
  • Figure 1 is a block diagram of a first embodiment of the injection system for an internal combustion engine
  • Figure 2 is a block diagram of another embodiment of the injection system.
  • FIG. 1 shows a first embodiment of an injection system for an internal combustion engine, with a fuel tank 10 from which fuel is conveyed by means of a pre-pump 12.
  • the feed pump 12 may be mechanically driven by a drive shaft 27, wherein the drive shaft 27 may be fixedly coupled to a motor shaft of the internal combustion engine.
  • the feed pump 12 is hydraulically coupled on the output side with a form control valve 28, which when exceeded a predetermined fuel pressure at the output side of the feed pump 12, a portion of the funded by the feed pump 12 fuel to the suction side of the feed pump 12 returns and thus keeps the fuel pressure at the output side of the feed pump 12 largely constant.
  • a high-pressure pump 14 Downstream of the pre-feed pump 12, a high-pressure pump 14, which conveys fuel into a fuel reservoir 16 via a fuel storage supply line 44.
  • the high pressure pump 14 may preferably be formed as a radial piston pump or as a series piston pump with a plurality of cylinder units, as are known for use in injection systems of internal combustion engines.
  • an inlet valve 17 is shown schematically in each case as a representative of further inlet valves of the high-pressure pump 14, which are each arranged on the input side of the cylinder units of the high-pressure pump 14.
  • the prefeed pump 12 and the high-pressure pump 14 together form a pump unit 26 in a constructive manner. This is preferably realized in such a way that the prefeed pump 12 and the high-pressure pump 14 are arranged together in a common housing.
  • the prefeed pump 12 and the high-pressure pump 14 preferably have the common drive shaft 27. However, the prefeed pump 12 and the high pressure pump 14 may alternatively have separate drive shafts.
  • the high-pressure pump 14 is connected downstream to the fuel reservoir 16, which in turn hydraulically via lines with the one injector 18 or more injectors 18th is coupled.
  • Each of the injectors 18 is associated with a combustion chamber of the internal combustion engine and each can be controlled so that fuel is injected into the combustion chamber. Excess fuel may be returned from the injectors 18 via an injector return line 46 to the fuel tank 10.
  • a volume flow control valve 22 is arranged, which allows a low-pressure side control of the fuel flow, which is the high-pressure pump 14 to be supplied.
  • the volume flow control valve 22 can be controlled as a function of the fuel pressure measured in the fuel storage 16 by a pressure sensor 24 as well as in dependence on further input variables.
  • the high-pressure pump 14 is connected to a check valve 20 by means of a line 42 branching off downstream of the high-pressure pump 14 and upstream of the fuel reservoir 16.
  • the line 42 branching off downstream of the high-pressure pump 14 and upstream of the fuel accumulator 16 is hydraulically coupled to a purge return line 35.
  • the check valve 20 can open and the fuel delivered by the high-pressure pump 14 can be guided into the fuel tank 10 via the line 42 branching off downstream of the high-pressure pump 14 and upstream of the fuel accumulator 16 and the purge return line 35.
  • a purge line 29 which opens on the output side into the housing of the high-pressure pump 14. This can be done during the Operation of the high-pressure pump 14, the housing of the high pressure pump 14 are flushed, whereby cooling and lubrication of the high-pressure pump 14 is made possible.
  • a purge line valve 32 and hydraulically in series thereto a purge line throttle 34 is arranged in the purge line 29 Brennstoffström.
  • the purge line valve 32 is designed such that it releases the fuel flow passing through the purge line 29 only when an intended fuel pressure on the output side of the prefeed pump 12 is exceeded.
  • the opening pressure difference at the purge line valve 32 must be greater than the opening pressure difference of the inlet valve 17 of the high-pressure pump 14 and the line between them. This is the only way to ensure that the flushing of the high-pressure pump 14 does not begin until the operating pressure of the high-pressure pump 14 has been reached. This ensures that the pressure build-up on the suction side of the high pressure pump 14 is not delayed.
  • the fuel used for Spülungs can leave the high-pressure pump 14 via the purge return line 35 and returned via this in the fuel tank 10.
  • one or more filters 36, 38 are arranged in front of the feed pump 12 and the volume flow control valve 22 for protection against entrained particles in the fuel flow or for separating water.
  • a first filter 36 is hydraulically provided between the fuel tank 10 and the prefeed pump 12 to protect the feed pump 12.
  • a second filter 38 is arranged in order to protect the volume flow control valve 22 and the high-pressure pump 14 before the volume flow control valve 22nd .
  • the first filter 36 and the second filter 38 are preferably provided with venting devices.
  • the purge return line 35 and the injector return line 46 from the injectors 18 are preferably returned to the fuel tank 10.
  • a vent valve 30 is arranged in a downstream of the flow control valve 22 and upstream of the high-pressure pump 14 branching line 40.
  • the downstream of the volume flow control valve 22 and upstream of the high-pressure pump 14 branching line 40 ends on the output side downstream of the fuel tank 10 and upstream of the Vorför- derpumpe 12.
  • the vent valve 30 it is possible, located in the lines located, trapped in the fuel gases in the fuel tank 10 , This may be important in particular when commissioning the injection system when air has collected in the lines after a standstill of the injection system.
  • the venting valve 30 is preferably arranged in the direction of gravity above the high-pressure pump 14, particularly preferably above the inlet valve 17 of the high-pressure pump 14, so that a reliable discharge of gases enclosed in the fuel, in particular from the high-pressure pump 14 of the injection system, is possible.
  • the downstream of the volume flow control valve 22 and upstream of the high-pressure pump 14 branching line 40 and the vent valve 30 are preferably formed within the pump unit 26.
  • the downstream of the volume Current control valve 22 and upstream of the high-pressure pump 14 branching line 40 and the vent valve 30 in the housing of the pump unit 26 additional joints avoided and a particularly high density of the injection system can be achieved.
  • the vent valve 30 has an opening through which a fuel mass flow can flow, which corresponds to a fuel leakage mass flow of the volume flow control valve 22. It can thus be achieved that, if the volume flow control valve 22 does not completely prevent the fuel mass flow, ie has a fuel leakage mass flow, the fuel leakage mass flow can be removed via the venting valve 30 and is not conveyed by the high-pressure pump 14 to the injectors. It is thus possible to design the volume flow control valve 22 as a slide valve, which can be particularly cost-effective.
  • the inlet valve 17 of the high-pressure pump 14 preferably has an opening pressure difference of at least 1.0 bar.
  • the prefeed pump 12 delivers fuel from the fuel tank 10, wherein the intermediate first filter 36 can clean the fuel of particulate pollution and free water fractions, to prevent wear and corrosion in the injection system.
  • the admission pressure control valve 28 the pressure of the high-pressure pump 14 is to be supplied. limited to the fuel.
  • the prefeed pump 12 supplies the fuel via the second filter 38 to the volume flow control valve 22. At this, the fuel flow rate for the suction side of the high pressure pump 14 can be adjusted.
  • the high-pressure pump 14 supplies the fuel storage 16 via the fuel storage supply line 44, the amount of fuel required for the injectors 18. If an inadmissibly high pressure is reached in the fuel reservoir 16, then the check valve 20 opens and fuel can be returned from the fuel reservoir 16 into the fuel tank 10.
  • the fuel pressure produced on the pressure side of the prefeed pump 12 is initially so low that the admission pressure control valve 28 is closed.
  • a pressure build-up on the pressure side of the feed pump 12 wherein a portion of the fuel flow is guided via the downstream of the flow control valve 22 and upstream of the high-pressure pump 14 branching line 40 to the vent valve 30 and optionally located in the lines, trapped in the fuel gases can be removed via the venting device of the second filter 38 at least partially from the injection system.
  • the inlet valve 17 opens the high-pressure pump 14 and the high-pressure pump 14 delivers fuel into the fuel reservoir 16.
  • the purge line valve can Open 32 and fuel is conveyed through the purge line 29 and used to purge the high-pressure pump 14.
  • trapped in the fuel gases can in this case by means of Vortex- pump 12 from the vent valve 30 at least partially returned via the purge line 29 and the purge return line 35 to the fuel tank 10 and discharged from the injection system. It can thus be achieved that the gases enclosed in the fuel are kept away from the inlet valve 17 of the high-pressure pump 14. This makes it possible to ensure that the cylinder units of the high-pressure pump 14 operate uniformly, as a result of which a uniform delivery of the high-pressure pump 14 can be achieved.
  • FIG. 2 shows a further embodiment of the injection system. Below, essentially only the differences of the further embodiment to the first embodiment of the injection system are described.
  • the line 40 branching downstream of the volume flow control valve 22 and upstream of the high pressure pump 14 discharges upstream of the fuel tank 10 into the purge return line 35, providing hydraulic coupling between the line branching downstream of the volumetric flow control valve 22 and upstream of the high pressure pump 14 40 and the fuel tank 10 is given.
  • the feed pump 12 and the high pressure pump 14 are coupled together in this embodiment via the common drive shaft 27, but otherwise formed separately.
  • the mode of operation of the second embodiment of the injection system differs from the function of the first embodiment of the injection system in that the optionally located in the lines, inserted in the fuel. closed gases via the downstream of the volume flow control valve 22 and upstream of the high-pressure pump 14 branching line 40 and subsequently returned directly via the purge return line 35 to the fuel tank 10 and can be discharged from the injection system.
  • the optionally located in the lines inserted in the fuel. closed gases via the downstream of the volume flow control valve 22 and upstream of the high-pressure pump 14 branching line 40 and subsequently returned directly via the purge return line 35 to the fuel tank 10 and can be discharged from the injection system.

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

Abstract

Système d'injection pour un moteur à combustion interne, comprenant : au moins un injecteur (18) couplé à un accumulateur de carburant (16) ; une pompe de pré-alimentation (12) pour acheminer du carburant à partir d'un réservoir de carburant (10) ; une pompe à haute pression (14) disposée en aval de la pompe de pré-alimentation (12) pour acheminer du carburant dans l'accumulateur de carburant (16) ; une soupape (22) de commande de débit volumique disposée hydrauliquement entre la pompe de pré-alimentation (12) et la pompe à haute pression (14), soupape qui permet de régler le flux de carburant de la pompe de pré-alimentation (12) dans la pompe à haute pression (14) ; et une soupape de désaérage (30), qui est disposée en aval de la soupape (22) de commande de débit volumique et qui est conçue et disposée pour évacuer les gaz qui sont inclus dans le carburant en amont de la pompe à haute pression (14).
PCT/EP2007/064386 2006-12-21 2007-12-20 Système d'injection pour un moteur à combustion interne WO2008077904A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006060754.6 2006-12-21
DE200610060754 DE102006060754A1 (de) 2006-12-21 2006-12-21 Einspritzanlage für eine Brennkraftmaschine

Publications (1)

Publication Number Publication Date
WO2008077904A1 true WO2008077904A1 (fr) 2008-07-03

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PCT/EP2007/064386 WO2008077904A1 (fr) 2006-12-21 2007-12-20 Système d'injection pour un moteur à combustion interne

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DE (1) DE102006060754A1 (fr)
WO (1) WO2008077904A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014072678A2 (fr) * 2012-11-07 2014-05-15 Perkins Engines Company Limited Ensemble de pompe et vanne

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015048983A1 (fr) * 2013-10-04 2015-04-09 Volvo Truck Corporation Système d'injection de carburant pour carburants à faible viscosité
DE102017221333B4 (de) 2017-11-28 2021-01-28 Vitesco Technologies GmbH Toleranz- und Verschleißkompensation einer Kraftstoffpumpe
DE102017221342B4 (de) * 2017-11-28 2021-01-28 Vitesco Technologies GmbH Toleranz- und Verschleißkompensation einer Kraftstoffpumpe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0039304A1 (fr) * 1980-04-28 1981-11-04 Stanadyne Inc. Dispositif de réglage de déphasage d'une pompe d'injection de carburant
DE19858084C1 (de) * 1998-12-16 2000-04-20 Siemens Ag Einspritzsystem und zugehöriges Betriebsverfahren
EP1088984A2 (fr) * 1999-09-30 2001-04-04 Siemens Aktiengesellschaft Système d'injection pour un moteur à combustion interne

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10153185A1 (de) * 2001-10-27 2003-05-15 Bosch Gmbh Robert Kraftstoffeinspritzanlage mit verbesserter Fördermengenregelung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0039304A1 (fr) * 1980-04-28 1981-11-04 Stanadyne Inc. Dispositif de réglage de déphasage d'une pompe d'injection de carburant
DE19858084C1 (de) * 1998-12-16 2000-04-20 Siemens Ag Einspritzsystem und zugehöriges Betriebsverfahren
EP1088984A2 (fr) * 1999-09-30 2001-04-04 Siemens Aktiengesellschaft Système d'injection pour un moteur à combustion interne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014072678A2 (fr) * 2012-11-07 2014-05-15 Perkins Engines Company Limited Ensemble de pompe et vanne
WO2014072678A3 (fr) * 2012-11-07 2014-08-07 Perkins Engines Company Limited Ensemble de pompe et vanne

Also Published As

Publication number Publication date
DE102006060754A1 (de) 2008-06-26

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