EP1124054A2 - Système d'alimentation en carburant pour un moteur à combustion - Google Patents

Système d'alimentation en carburant pour un moteur à combustion Download PDF

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Publication number
EP1124054A2
EP1124054A2 EP01101901A EP01101901A EP1124054A2 EP 1124054 A2 EP1124054 A2 EP 1124054A2 EP 01101901 A EP01101901 A EP 01101901A EP 01101901 A EP01101901 A EP 01101901A EP 1124054 A2 EP1124054 A2 EP 1124054A2
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
pump
line
combustion engine
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.)
Granted
Application number
EP01101901A
Other languages
German (de)
English (en)
Other versions
EP1124054A3 (fr
EP1124054B1 (fr
Inventor
Christian Treml
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP1124054A2 publication Critical patent/EP1124054A2/fr
Publication of EP1124054A3 publication Critical patent/EP1124054A3/fr
Application granted granted Critical
Publication of EP1124054B1 publication Critical patent/EP1124054B1/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
    • 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
    • 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
    • F02M37/0076—Details of the fuel feeding system related to the fuel tank
    • F02M37/0088—Multiple separate fuel tanks or tanks being at least partially partitioned
    • F02M37/0094—Saddle tanks; Tanks having partition walls
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps

Definitions

  • the invention relates to a fuel supply system for an internal combustion engine with the fuel from a tank via a delivery line to the internal combustion engine pumping fuel pump and with a pressure regulator, of the fuel pressure relevant for the internal combustion engine optionally adjusted to different pressure levels.
  • a fuel supply system for an internal combustion engine with the fuel from a tank via a delivery line to the internal combustion engine pumping fuel pump and with a pressure regulator, of the fuel pressure relevant for the internal combustion engine optionally adjusted to different pressure levels.
  • the hot start problem described could be the rest also in hot operation with low fuel consumption of the internal combustion engine (for example, in stop-and-go operation of the engine driven motor vehicle) can occur by using a corresponding more powerful fuel pump - usually come for this electrically driven fuel pumps for use - solve, but is this is undesirable from the point of view of economy and efficiency.
  • a so-called Internal combustion engine relevant fuel pressure of 3.5 bar sufficient while for the hot start and possibly also for the hot operation with regard to the described vapor bubble formation a "relevant" fuel pressure of e.g. 6 bar would be desirable.
  • a cold start of an internal combustion engine can also be carried out represent a critical operating state because despite possibly reduced electrical voltage to operate the fuel pump sufficiently high fuel pressure level must be provided.
  • the pressure level of 6 bar can be generated if one is usually present Pressure regulator that meets the pressure level of 3.5 that is usually required bar (e.g.), suitably detuned.
  • this pressure regulator is in one of the delivery line Return line branching off from the fuel pump and opening into the fuel tank arranged.
  • this return line is downstream of the pressure regulator cordoned off or at least throttled, this leads due to the lower amount of fuel returned to the tank inevitably becomes one Pressure build-up or to a pressure increase in the delivery line, see above that at least in these clearly limited operating states an excessive fuel pressure of, for example, 6 bar can be provided.
  • the described start and / or hot operation problem arises otherwise also in internal combustion engines working with direct fuel injection in which, on the one hand, with the (electrical) Fuel pump provided fuel pressure started the internal combustion engine and on the other hand at or near the internal combustion engine (and thus in the possibly very hot engine compartment of a motor vehicle) High-pressure fuel pump is arranged, for which the previously mentioned and quasi arranged fuel pump upstream of said pressure regulator represents a pre-feed pump.
  • the so-called relevant for the internal combustion engine Fuel pressure is then the one on the suction side of the High pressure fuel pump applied fuel pressure. This pressure too should, for example, under normal operating conditions of the internal combustion engine of the order of 3.5 bar, in the critical start and / or hot operation conditions again in the range of 6 bar.
  • the reference number 1 denotes the fuel tank of a motor vehicle, in which an electric fuel pump 2 is arranged, which has a Delivery line 3 of a high-pressure fuel pump 4 from one, not shown Internal combustion engine provides the required fuel.
  • high-pressure pump mechanically driven by the internal combustion engine 4 promotes that provided by the electric fuel pump 2
  • Fuel under very high pressure e.g. in the order of 130 bar
  • an injection bar 5 provided on the internal combustion engine, from which the assigned to the individual internal combustion engine cylinders, only symbolically represented fuel injection valves 6 supplied become.
  • a shut-off valve 9 from a leakage line 10, which in a in the tank 1 leading return line 11 opens, and the low fuel leakage the high pressure pump 4 are discharged.
  • a pressure regulator 12 is located in the delivery line 3 upstream of the high-pressure pump 4 arranged, one of which ends in the return line 11 already mentioned Diverter line 22 branches off, so that the pressure regulator 12 is only one such amount of fuel via the delivery line 3 of the high pressure pump 4 for Provides that under normal operating conditions there, i.e. on whose suction side, the so-called pressure of the internal combustion engine e.g. 6 bar (measured as a differential pressure in relation to the environment). The excess of, required to achieve this relevant pressure the fuel pump 2 delivered and therefore not required amount of fuel is from the pressure regulator 12 via the control line 22 and the return line 11 returned to tank 1.
  • the pressure regulator 12 is a fuel filter 13 upstream, but this is immaterial.
  • a check valve (not shown) is provided in the fuel pump 2 and the filter 13, so that it is only when the engine is turned off is necessary to simultaneously close the shut-off valve 9 already mentioned, to ensure that even when the internal combustion engine is at a standstill at least for a certain period upstream of the high pressure pump 4 the so-called fuel pressure relevant for the internal combustion engine (from 6 bar as differential pressure) is maintained or remains.
  • the object of the present invention to show improvements.
  • the pressure regulator is arranged in the delivery line and that the fuel pump is formed from two pump units which, depending on the regulated pressure level, deliver in parallel or in series.
  • the fuel pump at least two pump stages has or consists of two individual pumps at all - (both mentioned Variants should be under the chosen term "Pump units" fall) - which flow in different ways can be switched to each other.
  • the pump units are connected in series, it is on the suction side of the downstream pump unit already has an increased fuel Pressure level, namely that of the upstream Pump unit is provided.
  • each of the pump units able to generate a delivery pressure of 3 bar, so that the fuel pressure on the pressure side of the unit is 3 bar above that lie on the suction side of the unit.
  • the pump units are connected in parallel, only a pressure level of 3 bar is set on their common pressure side, which is fluidically linked by parallel connection or side-by-side arrangement, but it can then advantageously (again viewed in simplified terms) promote or provide twice the amount of fuel be as if the two pump sets are connected in series.
  • the particular advantage of a fuel supply system according to the invention is that the required amount of fuel can be provided at a favorable pressure level for different operating states of the internal combustion engine with relatively little effort and at the same time as being optimally efficient and without having to accept the disadvantages that have arisen in the prior art . If a large quantity of fuel is requested by the internal combustion engine, a lower fuel pressure level is completely sufficient, while if a high pressure level is required, an at least slightly reduced quantity of fuel is requested.
  • the proposed fuel supply system can meet these requirements fully meet.
  • Most favorable pressure level for the pressure relevant for the internal combustion engine can be set. Since usually two different pressure levels, namely a higher one (for example 6 bar overpressure compared to atmosphere) as well as a lower (for example, 3.5 bar overpressure) are sufficient with regard to a particularly simple and safe structure of such a variable pressure regulator in the delivery line in series two pressure regulators be arranged with different pressure control values, which are optional by connecting their diverter line to one that ends in the tank Return line can be activated.
  • the Pump units of the fuel pump are either connected in series, whereby simply provide a higher pressure with a lower flow rate can be, or the pump units are connected in parallel to each other, which makes it easier and more efficient to use a higher one at a lower delivery pressure Flow rate can be offered.
  • the two pump assemblies of the fuel pump according to the invention can be connected in series or in parallel by means of a changeover valve or automatically by means of a pressure relief valve provided in a suitably arranged line connection, depending on the pressure value set by the pressure regulator, as well as from the two preferred exemplary embodiments of the two explained below Invention emerges.
  • a changeover valve or automatically by means of a pressure relief valve provided in a suitably arranged line connection, depending on the pressure value set by the pressure regulator, as well as from the two preferred exemplary embodiments of the two explained below Invention emerges.
  • a pressure relief valve provided in a suitably arranged line connection, depending on the pressure value set by the pressure regulator, as well as from the two preferred exemplary embodiments of the two explained below Invention emerges.
  • FIGS. 1 and 2 fuel supply systems according to the invention are shown, based on the already explained prior art illustration according to FIG. 3, the same reference numbers being used for the same elements.
  • the pressure regulator 12 arranged in the delivery line 3 is composed, as it were, of two pressure regulators 12a, 12b connected in series with different pressure control values, with a control line 22a and 22b branching off each pressure regulator 12a, one of which can optionally be connected to the return line 11 leading to the tank 1 via a 3/2-way valve 20, which is preferably designed as an electromagnetic valve.
  • the two pressure regulators 12a, 12b are mechanical pressure regulators which are customary per se and which, by controlling a certain amount of fluid or, in this case, fuel in the return line 11 in the delivery line 3, set a certain pressure level. This pressure level is usually defined in relation to the atmospheric pressure, ie a conventional pressure regulator receives the atmospheric pressure as the so-called input control pressure, so that the regulated fluid pressure in the delivery line 3 is determined as the differential pressure in relation to the atmospheric pressure.
  • the pressure regulator 12a provided here directly downstream of the filter 13 For example, a pressure level of 3.5 bar when its drain line 22a the 3/2-way valve 20 is connected to the return line 11. Is this Connection interrupted by switching over the 3/2-way valve 20, so this first pressure regulator 12a is not active. Then at the same time Connection between the control line 22b of the second pressure regulator 12b and the return line 11, so that the latter pressure regulator 12b is activated or is in the delivery line 3 compared to the Pressure regulator 12a sets a higher pressure level of, for example, 6 bar.
  • this associated switching position of the 3/2-way valve is otherwise under the reference number 20 'shown, this position especially for the start the internal combustion engine and in hot operation of the same is selected while the switching position shown under the reference number 20 and this resulting lower pressure level of 3.5 bar in normal operation of the Internal combustion engine should be relevant.
  • each pump unit 2a, 2b is a suction line 23a, 23b assigned, one in the latter towards the pump unit 2b opening check valve 27b is provided.
  • the pressure line 24b of the second pump unit 2b opens directly into the delivery line 3, while the pressure line 24a of the first pump unit 2a branches into two sub-branches 24a ', 24a " can.
  • the first sub-branch 24a 'of the pressure line 24a of the first pump unit 2a opens into the delivery line 3 while passing a check valve 27a, while the second sub-branch 24a'', in which a pressure relief valve 25 is arranged, in the suction line 23b of the second pump unit 2b
  • the pressure limiting valve 25 is designed for the lower pressure control value of the pressure regulator 12, ie here for the pressure value of 3.5 bar of the pressure regulator 12a.
  • the pressure regulator 12a is active, it is positioned in the delivery line 3 a pressure of 3.5 bar, due to the pressure relief valve 25 the branch 24a "blocked so that the first pump unit 2a the Feeds fuel via the branch 24a 'into the delivery line 3. As a result the first pump unit 2a is then the second pump unit 2b connected in parallel in terms of flow.
  • the pressure line 24a of the first pump unit 2a opens into a 3/2-way valve 26, which is preferably designed as an electromagnetic valve, or generally a changeover valve 26, from which optionally the first branch 24a ', which opens into the delivery line 3, or the second branch 24a "opening in the suction line 23b of the second pump unit 2b can be activated.
  • a 3/2-way valve 26 which is preferably designed as an electromagnetic valve, or generally a changeover valve 26, from which optionally the first branch 24a ', which opens into the delivery line 3, or the second branch 24a "opening in the suction line 23b of the second pump unit 2b can be activated.
  • the pressure regulator 12a is active and is thus positioned in the delivery line 3 a pressure of 3.5 bar, the changeover valve 26 or the latter 3/2-way valve 26 switched such that the first Pump unit 2a the fuel via the branch 24a 'in the delivery line 3 promotes. As a result, the first pump unit 2a is then the second pump unit 2b connected in parallel in terms of flow.
  • the switch valve becomes at the same time 26 switched such that the first pump unit 2a the fuel via the branch 24a "to the suction side of the second pump unit 2b and thus in the suction line 23 b promotes. So that's the first Pump unit 2a with the second pump unit 2b in terms of flow connected in series, making it simple and efficient The required increased pressure level of 6 bar can be generated.
  • the associated switching position of the changeover valve designed as a 3/2-way valve 26 is otherwise shown at reference number 26 '.

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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)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP01101901A 2000-02-09 2001-01-27 Système d'alimentation en carburant pour un moteur à combustion Expired - Lifetime EP1124054B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10005589 2000-02-09
DE2000105589 DE10005589A1 (de) 2000-02-09 2000-02-09 Kraftstoffversorgungsanlage für eine Brennkraftmaschine

Publications (3)

Publication Number Publication Date
EP1124054A2 true EP1124054A2 (fr) 2001-08-16
EP1124054A3 EP1124054A3 (fr) 2002-06-19
EP1124054B1 EP1124054B1 (fr) 2006-03-29

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Family Applications (1)

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EP01101901A Expired - Lifetime EP1124054B1 (fr) 2000-02-09 2001-01-27 Système d'alimentation en carburant pour un moteur à combustion

Country Status (2)

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EP (1) EP1124054B1 (fr)
DE (2) DE10005589A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002099264A1 (fr) * 2001-06-06 2002-12-12 Robert Bosch Gmbh Procede, programme informatique et organe de commande et/ou de reglage pour le fonctionnement d'un moteur a combustion interne et systeme de carburant pour un moteur a combustion interne
EP1555423A2 (fr) 2004-01-16 2005-07-20 Siemens Aktiengesellschaft Procédé pour ajuster le débit d'une pompe à carburant admettant le carburant d'un réservoir à carburant et pompe à carburant pour un tel procédé
EP1799992A2 (fr) * 2004-09-24 2007-06-27 Millennium Industries Corp. Systeme de distribution de carburant a pompes multiples
EP1923562A1 (fr) * 2006-11-16 2008-05-21 C.R.F. Societa Consortile per Azioni Ajustement de carburant et dispositif de réglage pour une pompe à haute pression
EP1978237A1 (fr) 2007-03-26 2008-10-08 Honda Motor Co., Ltd Dispositif d'approvisionnement en carburant d'un véhicule
WO2010032121A2 (fr) * 2008-09-19 2010-03-25 Toyota Jidosha Kabushiki Kaisha Appareil d'alimentation en carburant et procédé d'alimentation en carburant pour moteur à combustion interne

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10149237A1 (de) * 2001-10-05 2003-04-24 Bosch Gmbh Robert Verfahren, Computerprogramm und Steuer- und/oder Regelgerät zum Betreiben einer Brennkraftmaschine mit Direkteinspritzung
DE10259685A1 (de) * 2002-12-19 2004-07-01 Bayerische Motoren Werke Ag Rückführleitungsverschaltung einer Hochdruckpumpe einer Kraftstoffversorgungsanlage für eine Brennkraftmaschine
DE10360091A1 (de) * 2003-12-20 2005-07-21 Deutz Ag Hubkolbenbrennkraftmaschine mit einer Hilfspumpe
DE102004009792B3 (de) * 2004-02-28 2005-09-22 Daimlerchrysler Ag Kraftstoffzuführeinrichtung zur Versorgung der Injektoren an Brennräumen einer Brennkraftmaschine mit Kraftstoff
DE102005008380A1 (de) * 2005-02-23 2006-08-31 Siemens Ag Kraftstoffversorgungseinrichtung für ein Kraftfahrzeug

Citations (1)

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Publication number Priority date Publication date Assignee Title
DE4443836A1 (de) 1994-12-09 1996-06-13 Bosch Gmbh Robert Einrichtung zur Kraftstoffversorgung für eine Brennkraftmaschine

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DE3247915A1 (de) * 1982-12-24 1984-07-12 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffoerderanlage fuer brennkraftmaschinen, insbesondere in kraftfahrzeugen
DE3520660A1 (de) * 1985-06-08 1986-12-11 Bosch Gmbh Robert Verfahren und vorrichtung zum sicheren betrieb einer brennkraftmaschine
US4829964A (en) * 1986-06-03 1989-05-16 Mitsubishi Denki Kabushibi Kaisha Fluid pressure regulator
DE3811773A1 (de) * 1988-04-08 1989-10-19 Pierburg Gmbh Brennstoffversorgungseinrichtung fuer eine brennkraftmaschine
DE19530261A1 (de) * 1994-08-26 1996-02-29 Volkswagen Ag Niederdruck-Kraftstoffördersystem mit Hochdruckspeicherung
JPH08312485A (ja) * 1995-05-22 1996-11-26 Sanshin Ind Co Ltd 船外機用エンジンの燃料噴射装置
US5623907A (en) * 1995-06-09 1997-04-29 Walbro Corporation Liquid propane fuel delivery system
JP3063610B2 (ja) * 1996-03-07 2000-07-12 三菱自動車工業株式会社 内燃機関用燃料供給装置
US5708201A (en) * 1996-05-24 1998-01-13 Pierburg Instruments, Inc. Fuel delivery measurement system with automatic pump matching
DE19626689C1 (de) * 1996-07-03 1997-11-20 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überwachung eines Einspritzsystems
DE19631167B4 (de) * 1996-08-01 2005-08-11 Siemens Ag Referenzdruckventil
DE19709737B4 (de) * 1997-03-10 2005-12-22 Robert Bosch Gmbh Kraftstofförderanlage für eine Brennkraftmaschine, insbesondere in einem Kraftfahrzeug

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4443836A1 (de) 1994-12-09 1996-06-13 Bosch Gmbh Robert Einrichtung zur Kraftstoffversorgung für eine Brennkraftmaschine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002099264A1 (fr) * 2001-06-06 2002-12-12 Robert Bosch Gmbh Procede, programme informatique et organe de commande et/ou de reglage pour le fonctionnement d'un moteur a combustion interne et systeme de carburant pour un moteur a combustion interne
EP1555423A2 (fr) 2004-01-16 2005-07-20 Siemens Aktiengesellschaft Procédé pour ajuster le débit d'une pompe à carburant admettant le carburant d'un réservoir à carburant et pompe à carburant pour un tel procédé
EP1555423A3 (fr) * 2004-01-16 2011-02-23 Continental Automotive GmbH Procédé pour ajuster le débit d'une pompe à carburant admettant le carburant d'un réservoir à carburant et pompe à carburant pour un tel procédé
EP1799992A2 (fr) * 2004-09-24 2007-06-27 Millennium Industries Corp. Systeme de distribution de carburant a pompes multiples
EP1799992A4 (fr) * 2004-09-24 2010-06-02 Millennium Ind Corp Systeme de distribution de carburant a pompes multiples
EP1923562A1 (fr) * 2006-11-16 2008-05-21 C.R.F. Societa Consortile per Azioni Ajustement de carburant et dispositif de réglage pour une pompe à haute pression
US7603986B2 (en) 2006-11-16 2009-10-20 C.R.f Societa Consortio per Azioni Fuel adjustment and filtering device for a high-pressure pump
EP1978237A1 (fr) 2007-03-26 2008-10-08 Honda Motor Co., Ltd Dispositif d'approvisionnement en carburant d'un véhicule
US7500473B2 (en) 2007-03-26 2009-03-10 Honda Motor Co., Ltd. Vehicle fuel supply device
WO2010032121A2 (fr) * 2008-09-19 2010-03-25 Toyota Jidosha Kabushiki Kaisha Appareil d'alimentation en carburant et procédé d'alimentation en carburant pour moteur à combustion interne
WO2010032121A3 (fr) * 2008-09-19 2010-05-27 Toyota Jidosha Kabushiki Kaisha Appareil d'alimentation en carburant et procédé d'alimentation en carburant pour moteur à combustion interne
CN102159821A (zh) * 2008-09-19 2011-08-17 丰田自动车株式会社 用于内燃发动机的燃料供给装置和燃料供给方法

Also Published As

Publication number Publication date
DE10005589A1 (de) 2001-08-16
EP1124054A3 (fr) 2002-06-19
DE50109340D1 (de) 2006-05-18
EP1124054B1 (fr) 2006-03-29

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