EP1115975B1 - Systeme d'injection de carburant - Google Patents

Systeme d'injection de carburant Download PDF

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Publication number
EP1115975B1
EP1115975B1 EP99953704A EP99953704A EP1115975B1 EP 1115975 B1 EP1115975 B1 EP 1115975B1 EP 99953704 A EP99953704 A EP 99953704A EP 99953704 A EP99953704 A EP 99953704A EP 1115975 B1 EP1115975 B1 EP 1115975B1
Authority
EP
European Patent Office
Prior art keywords
pressure
pump
feed
fuel
injection system
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
EP99953704A
Other languages
German (de)
English (en)
Other versions
EP1115975A1 (fr
Inventor
Egon Eisenbacher
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP1115975A1 publication Critical patent/EP1115975A1/fr
Application granted granted Critical
Publication of EP1115975B1 publication Critical patent/EP1115975B1/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
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/103—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being a radial piston pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing
    • F04B49/246—Bypassing by keeping open the outlet valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/15—By-passing over the pump

Definitions

  • the invention relates to a fuel injection system for an internal combustion engine, in particular a diesel engine according to the preamble of claim 1.
  • the fuel is supplied via a prefeed pump 2 sucked out of a tank 4 and in a high-pressure pump device 6 with a high pressure pump, not shown and the associated switching elements on the required Brought fuel pressure.
  • the pressurized Fuel is the prescribed common High pressure line, the common rail 8 fed.
  • the Common rail injection system enables a cylinder-specific Control so that, for example, different strong combustion processes in the individual cylinders can be avoided and thus the smooth running of the diesel engine significantly improved compared to conventional systems can be. Because the high injection pressure already at low speeds is available will be optimal Mixture preparation in the cylinders causes that too an improvement in fuel consumption and one Lower exhaust emissions.
  • Fuel to a minimum level, for example 150 bar may be required to run the fuel when starting the engine in the required form atomize.
  • the high pressure pump device 6 Since the high pressure pump device 6 is usually on the internal combustion engine is coupled, this delivers immediately not enough after starting the engine Pressure to bring the fuel to the aforementioned minimum level bring from 150 bar. A larger dimension the high pressure pump device would reduce manufacturing costs of the diesel engine and also increase energy consumption, since this pump is in normal operation, i.e. when the engine is warm would be too big.
  • DE 3315927A1 presented a common rail injection system in which the High pressure pump device 6 when starting the engine a bypass circuit is bypassed, so that the common rail 8 is fed solely by the pre-feed pump 2.
  • the pre-feed pump 2 becomes operational via an auxiliary motor driven so that the performance of the pre-feed pump 2nd sufficient to get the fuel to the required pressure level bring to.
  • US 5 626 121A discloses a common rail injection system shown in which - similar to the one described above Embodiment - when starting the engine the high-pressure pump device 6 via a bypass line bypassed and the common rail 8 via the prefeed pump 2 is brought to the required pressure level.
  • the invention is based on the object to create a fuel injection system in which the Fuel supply with minimal circuitry Effort also when starting the engine in the required Way is guaranteed.
  • the invention is characterized in that downstream the feed pump a pressure relief valve arrangement with a pressure relief valve and one the pressure relief valve provided upstream valve device in which the valve device switches off a pressure or Pressure relief valve has that over the pressure Openable in the common rail against the force of the compression spring is.
  • control spring of the pressure cut-off or pressure relief valve designed such that the pilot pressure must exceed about 150 bar.
  • the supply pressure of the high pressure pump can be also vary by the pressure relief valve assembly electrically or electrohydraulically depending controllable from the operating state of the internal combustion engine is, so that the feed pressure can be varied accordingly is.
  • the pre-feed pump as electrically operated Displacement pump and the high pressure pump as one from the internal combustion engine driven radial piston pump.
  • the pressure relief valve assembly can be one single valve can be summarized.
  • the fuel is fed through a pre-feed pump 2 conveyed from a tank 4, compressed to a feed pressure and via a feed line 14 to the input connection the high-pressure pump device 6 promoted.
  • a pre-feed pump 2 conveyed from a tank 4, compressed to a feed pressure and via a feed line 14 to the input connection the high-pressure pump device 6 promoted.
  • At the shown embodiment has a high pressure pump 16 and an upstream suction throttle valve 18, that in the embodiment shown as a 2-way valve is executed and operated electrically or electrohydraulically is. The control takes place via the not shown Control of the internal combustion engine.
  • Suction throttle valve 18 In its spring-loaded basic position it is Suction throttle valve 18 biased into a flow position. By activation via the motor control the suction throttle valve 18 brought into its blocking position are so that the supply to the high pressure pump 16 is interrupted is. This can be the case, for example, if the Injection system done so that the fuel supply to the cylinders is interrupted.
  • the suction throttle valve 18 should be made continuously adjustable, so that a suction throttle control of the high pressure pump 16th is possible.
  • the high pressure pump 16 is usually on the Crankshaft of the internal combustion engine is driven while the pre-feed pump 2 is a large-sized fuel pump which is also powered by the internal combustion engine becomes. Alternatively, this could be your own, for example have electric drive.
  • the pressurized fuel is over a High pressure line 20 promoted in the common rail 8, and from this via the injection nozzles 10 into the cylinder chambers injected.
  • a pressure modulation or Switched pressure relief valve 24 which at shown embodiment as a pressure relief valve is executed. This locks in its spring-loaded Home position the connection between the return line 22 and a tank line 26.
  • the pressure at the entrance of the feed pressure relief valve 24 is via a control line 30 to act against the control spring 28 End face of the valve member of the feed pressure relief valve 24 out. If a preset is exceeded Maximum feed pressure in the return line 22 the feed pressure relief valve 24 is in its flow position brought so that a via the tank line 26 Connection to tank 4 is opened.
  • the feed pressure relief valve shown in Figure 2 24 can also be designed as an electrically operated valve be controlled via the motor control he follows. With suitable control then the feed pressure to the high-pressure pump device 6 is modulated be so that the pressure in the common rail 8th is adjustable.
  • the invention differs Switching only insignificant from conventional common rail injection systems.
  • the feed pressure relief valve 24 is shown Embodiment a pressure shutdown or Pressure relief valve 32 upstream, that of a Compression spring 34 is biased into its closed position.
  • the compression spring 34 has a much higher spring rate as the control spring 28 and is in the embodiment shown chosen so that a control pressure in the range of 150 bar must be applied to the force of the compression spring 34 to overcome. In contrast, a pressure of below is sufficient 10 bar in the control line 30 to the power of Oversteer control spring 28.
  • the valve member of the pressure cut-off valve 32 is in the opening direction of the pressure acted upon in a high pressure control line 36, via the the pressure in the Common-Rai1 8 to the pressure cut-off valve 32 is reported.
  • the pressure cut-off valve is located during the starting process 32 due to the force of the compression spring 34 in its Locked position so that the return line 22 to the tank 4th is cordoned off.
  • the pre-feed pump 2 delivers at maximum Performance and is designed to provide the required Can deliver starting pressure of about 150 bar.
  • the Suction throttle valve 18 is in a flow position, so that the pressurized via the pre-feed pump 2 Fuel over the suction and not shown Pressure check valves of the high pressure pump 16 in the High pressure line 20 is promoted.
  • the delivers High pressure pump 16 makes a negligible contribution to Compression of the fuel 20. That is, the pressure in the common rail 8 is essentially by the effect brought the pre-feed pump 2 to that minimum level, that to an acceptable atomization of the fuel is required.
  • the pressure in the common rail 8 is via the high pressure control line 36 to the control side of the pressure cut-off valve 32 reported.
  • Pressure levels e.g. 150 bar
  • the pressure shut-off valve 32 is in its flow position brought so that the connection of the return line 22 open to the feed pressure relief valve 24 becomes.
  • the circuit according to the invention has one essential simpler structure than the injection systems described at the beginning, because in principle only the pre-feed pump 2 and the suction throttle valve 18 in view of that during pressure level of about 150 required for the starting process are to be dimensioned bar. As an additional component only the pressure cut-off valve 32 must be provided, that upstream of the feed pressure relief valve 24 is. By a large dimension feed pump 2 can thus a quick starting behavior of the internal combustion engine with minimal energy consumption and low device technology Ensure effort.
  • valve and Control means are provided to inject the feed pressure the feed line 14 during the starting process on the to bring required high pressure level.
  • a pressure relief valve can also be used.
  • a fuel injection system for one Internal combustion engine with a pre-feed pump and a high pressure pump, from the pressurized fuel to one Common Rail is eligible.
  • the supply pressure of the high pressure pump is high Brought pressure level, so that in the common rail very quickly the one required for optimal atomization Pressure builds up.

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

Claims (6)

  1. Système d'injection de carburant, comportant une pompe de pré-alimentation (2) pour envoyer le carburant d'un réservoir (4) dans une pompe haute pression (16), au moyen de laquelle le carburant peut être envoyé dans une rampe commune (8), dans laquelle sont disposées des buses d'injection (10) pour injecter, dans les cylindres (12) d'un moteur à combustion inteme, le carburant mis sous pression, un dispositif de soupapes de limitation de pression, comportant une soupape de limitation de pression (24) et un dispositif de soupape (32) placé en amont de la soupape de limitation de pression (24), étant prévu en aval de la pompe de pré-alimentation (2), la liaison entre la pompe de pré-alimentation (2) et la soupape de limitation de pression (24) pouvant être commandées par ce dispositif de soupape (32) en fonction de la pression dans la rampe commune (8), de telle façon que, pendant l'opération de démarrage du moteur à combustion interne, la pression d'alimentation soit augmentée, dans la rampe commune (8), au niveau de pression nécessaire pour l'injection,
       caractérisé en ce que
       le dispositif de soupape (32) présente une soupape de coupure ou de limitation de pression, pouvant être commandée, à l'encontre de la force d'un ressort de pression (34), au moyen de la pression dans la rampe commune (8).
  2. Système d'injection de carburant suivant la revendication 1, caractérisé en ce que le ressort de pression (34) est conçu de telle façon que la pression de commande en augmentation dépasse environ 150 bar.
  3. Système d'injection de carburant suivant l'une des revendications précédentes, caractérisé en ce qu'en amont de la pompe haute pression (16), est placée une soupape de bobine d'absorption (18), au moyen de laquelle l'alimentation en carburant vers la pompe haute pression (16) peut être coupée.
  4. Système d'injection de carburant suivant l'une des revendications précédentes, caractérisé en ce que la soupape de limitation de pression (24, 32) peut être commandé électriquement ou électro-hydrauliquement, pour faire varier la pression d'alimentation.
  5. Système d'injection de carburant suivant l'une des revendications précédentes, caractérisé en ce que la pompe de pré-alimentation (2) est une pompe à pistons plongeurs et rotative, entraínée électriquement, et/ou que la pompe haute pression (16) est une pompe radiale à pistons, entraínée par le moteur à combustion interne.
  6. Système d'injection de carburant suivant l'une des revendications précédentes, caractérisé en ce que le dispositif de soupape de limitation de pression (24, 32) est réalisé sous la forme d'une soupape unique.
EP99953704A 1998-09-24 1999-09-02 Systeme d'injection de carburant Expired - Lifetime EP1115975B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19843940A DE19843940A1 (de) 1998-09-24 1998-09-24 Kraftstoffeinspritzsystem
DE19843940 1998-09-24
PCT/DE1999/002791 WO2000017516A1 (fr) 1998-09-24 1999-09-02 Systeme d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1115975A1 EP1115975A1 (fr) 2001-07-18
EP1115975B1 true EP1115975B1 (fr) 2003-11-12

Family

ID=7882178

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99953704A Expired - Lifetime EP1115975B1 (fr) 1998-09-24 1999-09-02 Systeme d'injection de carburant

Country Status (3)

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EP (1) EP1115975B1 (fr)
DE (2) DE19843940A1 (fr)
WO (1) WO2000017516A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19912666A1 (de) 1999-03-20 2000-09-21 Bosch Gmbh Robert Brennstoffeinspritzentil
DE102004046095B4 (de) * 2004-09-23 2018-02-15 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102005003592A1 (de) * 2005-01-26 2006-08-03 Daimlerchrysler Ag Kraftstoffversorgungseinrichtung
DE102007016764A1 (de) 2007-04-07 2008-10-09 Audi Ag Verfahren zum Betreiben eines Kraftstoffeinspritzsystems im Startvorgang und Kraftstoffeinspritzsystem hierzu

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19539885A1 (de) * 1995-05-26 1996-11-28 Bosch Gmbh Robert Kraftstoffversorgungsanlage und Verfahren zum Betreiben einer Brennkraftmaschine
DE19612412B4 (de) * 1996-03-28 2006-07-06 Siemens Ag Regelung für ein Druckfluid-Versorgungssystem, insbesondere für den Hochdruck in einem Kraftstoff-Einspritzsystem
DE19618707C2 (de) * 1996-05-09 1998-12-17 Siemens Ag Verfahren und Vorrichtung zur Regelung eines Kraftstoffvolumenstromes

Also Published As

Publication number Publication date
EP1115975A1 (fr) 2001-07-18
DE59907743D1 (de) 2003-12-18
DE19843940A1 (de) 2000-03-30
WO2000017516A1 (fr) 2000-03-30

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