EP2449245B1 - Système de carburant pour un moteur à combustion interne - Google Patents

Système de carburant pour un moteur à combustion interne Download PDF

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Publication number
EP2449245B1
EP2449245B1 EP10718151.3A EP10718151A EP2449245B1 EP 2449245 B1 EP2449245 B1 EP 2449245B1 EP 10718151 A EP10718151 A EP 10718151A EP 2449245 B1 EP2449245 B1 EP 2449245B1
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EP
European Patent Office
Prior art keywords
pressure
fuel
pump
line
fuel 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.)
Active
Application number
EP10718151.3A
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German (de)
English (en)
Other versions
EP2449245A1 (fr
Inventor
Christian Langenbach
Achim Koehler
Jens Grieb
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
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Publication of EP2449245A1 publication Critical patent/EP2449245A1/fr
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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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/205—Quantity of fuel admitted to pumping elements being metered by an auxiliary metering device
    • 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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system
    • 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
    • F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank
    • 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
    • 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
    • F02M69/54—Arrangement of fuel pressure regulators

Definitions

  • the invention relates to a fuel system for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel system is through the DE-C-10 154 133 known.
  • This fuel system has a prefeed pump, a high-pressure pump, a metering device arranged hydraulically between prefeed pump and high-pressure pump, and a zero-delivery line for conveying off leakages from the metering device.
  • suction means are arranged which comprise a Venturi nozzle.
  • the fuel system also has a pressure regulating valve for regulating the pressure in a low pressure region lying between the pre-feed pump and the high-pressure pump.
  • the Venturi nozzle is disposed at the downstream end of the zero delivery line in a drain line of the pressure control valve. If the pressure control valve has several Ab Kunststoffen is available for the function of the Venturi nozzle only a portion of the controlled by the pressure control valve amount of fuel available.
  • the fuel system with the features of claim 1 has the advantage that is available through the arrangement of the Venturi nozzle in the supply line of the pressure control valve, the total by the pressure control valve controlled amount of fuel for the function of the Venturi nozzle available.
  • the feed line is part of a lubricating and / or cooling line of the high-pressure pump, and that the pressure regulating valve has a first opening pressure, from which it connects the feed line to a return line. This ensures that the Venturi nozzle flows through even at a comparatively low pressure in the low pressure range, for example when starting the internal combustion engine, with fuel and the zero discharge leakage is effectively dissipated.
  • the high pressure pump comprises at least one return line for returning a bearing leakage, and that in the return line to the high pressure pump out locking spring-loaded check valve is arranged.
  • the check valve ensures that the fuel pressure can be built up faster when starting.
  • a spring-loaded check valve or a pressure limiting valve is arranged parallel to the prefeed pump, which opens in the direction of feed pump inlet.
  • the check valve or pressure relief valve has the task, for example, in the case of using a pressure-side fuel filter (upstream of the prefeed pump) to protect in a possible blockage of the filter, the feed pump from overloading.
  • a warning signal for example. Issued to a dashboard of the motor vehicle to free the filter from the blockage, or replace the filter.
  • a hand pump is provided for filling the fuel system, for example after a repair or maintenance. Therefore, it is advantageous for such an embodiment that a spring-loaded non-return or a pressure limiting valve is arranged parallel to the prefeed pump, which opens in the direction of the high-pressure pump inlet. During filling, this valve is a bypass to the pre-feed pump, so that not all the fuel has to be pumped through the pre-feed pump for filling.
  • FIG. 1 shows a fuel system 10, which is designed for a so-called. Common Rail injection system of an internal combustion engine 12.
  • fuel rail common rail
  • fuel injectors 16 are connected to the fuel rail 14, injecting the fuel under high pressure into combustion chambers 18 of the internal combustion engine 12.
  • the fuel is conveyed from a fuel tank 20 of a motor vehicle.
  • a fuel filter 24, a throttle 25 and a mechanically or electrically operated prefeed pump 26 are arranged in a fuel delivery path 22, starting from the fuel tank 20.
  • the fuel path first opens to lubricate drive parts in a drive or crank chamber 28 of a high-pressure pump 30, which is preferably designed as a mechanically driven radial piston pump.
  • the course of the fuel in the fuel system 10 is marked with arrows in the drawing.
  • the flow flow of the fuel behind the drive and crank chamber 28 is divided into two parts.
  • the first output of the fuel is an operating line 32 for operating the internal combustion engine 12
  • the second output is a Supply return line 34 of a fuel circuit for lubricating and cooling the high pressure pump 30th
  • the fuel is supplied in the flow direction via a further fuel filter 35 to a metering device 36, which is designed as an electromagnetically controllable, proportional spring-loaded slide valve.
  • the metering device 36 is thus arranged fluidically or hydraulically between the prefeed pump 26 and the high-pressure pump 30 and serves for metering the fuel for the high-pressure pump 30. Downstream of the metering device 36, the fuel flow is divided into two again. On the one hand, a zero-feed line 38 branches off, which opens via a fuel filter 39 in a Venturi nozzle 40. A detailed description of the Venturi nozzle 40 follows later.
  • a delivery line 42 branches off, which opens via a suction valve 44 into a delivery chamber 46 of the high-pressure pump 30, which is connectable to the fuel distributor 14 via a non-return valve 48 blocking the high-pressure pump 30.
  • the fuel located in the drive and crank chamber 28 is fed in the flow direction via a further fuel filter 50 to a pressure regulating valve 52, which is designed as a spring-loaded piston slide valve having two switching stages.
  • the supply return line 34 thus also represents the feed line of the pressure regulating valve 52.
  • the pressure regulating valve 52 comprises, in addition to the input for the supply return line 34, three outputs. In the first switching stage - ie at low fuel pressure in the supply return line 34 - the fuel is conveyed in a return line 54 via a throttle 56 in the fuel tank 20, in the second switching stage - at higher fuel pressure in the supply return line 34 - the fuel is in a flow line 58 promoted, in which the Venturi nozzle 40 is arranged.
  • the return line 54 and the flow line 58 thus represent Abêt Oberen the pressure control valve 52.
  • the flow line 58 opens into the fuel delivery line 22.
  • a third output 60 of the pressure control valve 52 is only used to equalize the pressure when moving the spool in the pressure control valve 52. Again, leaks may occur Leakage fuel is conveyed via a throttle 62 in the return line 54.
  • the high-pressure pump 30 usually has two bearing points for supporting a rotary shaft of an eccentric. These bearings can also leak fuel leakage.
  • the two bearings are in FIG. 1 shown as throttles 63.
  • the leakage of the bearings 63 is returned via the return line 54 to the fuel tank 20.
  • the venturi 40 is in FIG. 2 shown in section. It consists of a tube 64 which is glazed on an outer side and a constriction of the inner cross-section D through two oppositely directed cones 66 and 68, which are brought together in the region of their smallest diameter D.
  • the two cones 66 and 68 have the same tapered cross section D and the same expanded cross-section 3D. All edges in the interior of the tube 64 are rounded according to a streamline shape.
  • the expanded cross-section 3D is about three times as large as the tapered cross-section D.
  • the cone 66 has approximately the length of the tapered cross section D; the length of the cone 68 has a length 3-5D of approximately three to five times the length of the tapered cross-section D in the flow direction 70.
  • a removal channel 72 is provided perpendicular to the tube 64.
  • the cross-section of the take-off channel 72 is substantially smaller relative to the cross-section D and is dimensioned so that it represents a throttle cross section of a zero-feed throttle.
  • the zero-delivery line 38 is connected to this zero-feed throttle 72, whereas the pipe 64 is part of the flow line 58.
  • a channel in a housing of the high-pressure pump 30 may have the Venturi nozzle 40 as an injection-molded part.
  • the Venturi nozzle 40 could alternatively be designed as a screw solution or as an external component.
  • venturi 40 functions as follows when used in the fuel system:
  • a dynamic pressure (dynamic pressure) maximum and a static pressure (static pressure) is minimal.
  • the speed of the flowing fuel increases in proportion to the cross sections D: 3D when flowing through the constricted part of the tube 64, because everywhere the same amount of fuel flows through. Due to the comparatively low pressure in the region of the narrowest point D, a correspondingly low pressure also prevails at the mouth of the zero-feed throttle 72.
  • venturi nozzle 40 forms a suction means at the downstream end of the zero-conveying line 38.
  • the non-inventive fuel system 10 in the in FIG. 1 thus works as follows:
  • Fuel is sucked by the suction effect of the prefeed pump 26 from the fuel tank 20 via the fuel delivery line 22.
  • the fuel is filtered in the fuel filter 24. From there, fuel is supplied via the operating line 32 of the open metering device 36 for operating the internal combustion engine 12, after which the fuel via the suction valve 44 then into the delivery chamber 46 of the There, the fuel is compressed and introduced under high pressure via the check valve 48 into the rail 14 of the internal combustion engine.
  • the prefeed pump 26 usually delivers more fuel than is necessary for the operation of the internal combustion engine 12, even with partially open metering device 36, ie in load operation of the internal combustion engine 12, a certain fuel flow in the supply line 34 is formed, which, however, is less than in overrun mode, so that the pressure control valve 52 opens only partially. While the amount of fuel flowing through the return line 54 is (still) unaffected, the flow of fuel through the flow line 58 is lower, so that the suction power of the Venturi nozzle 40 is lower
  • the spring-loaded pressure control valve 52 When starting the internal combustion engine 12, the spring-loaded pressure control valve 52 is initially closed, so that via the operating line 32 as large as possible fuel pressure at open metering device 36 can build.
  • a fuel leakage occurs at the metering device 36.
  • the leakage is supplied via the zero-delivery line 38 and the zero-feed throttle 72 of the Venturi nozzle 40. Since in the case of the closed metering device 36, the flow line 58 has a large flow, created at the entrance of the take-off tube 72 in the venturi 64 a greater suction than at partially or fully open metering 36- The venturi 40 sucks the leakage from the zero feed line 38th from and promotes them with the remaining fuel to the input of the feed pump 26 in the fuel delivery line 22nd
  • FIG. 3 shows an embodiment of the invention.
  • FIG. 3 It holds that such elements and areas which are functionally equivalent to elements and areas of the fuel system of FIG. 1 , bear the same reference numerals and will not be explained again in detail.
  • the difference to FIG. 1 lies in the arrangement of the Venturi nozzle 40. This is in contrast to FIG. 1 in the supply line 34, that is arranged in the feed line of the pressure control valve 52.
  • the function of this embodiment is substantially identical to the described function of the embodiment in FIG FIG. 1 ,
  • the Venturi nozzle 40 also operates at relatively low flow through the feed line 34.

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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)

Claims (5)

  1. Système de carburant (10) pour un moteur à combustion interne (12) en particulier d'un véhicule automobile, lequel système de carburant comprend une pompe de pré-refoulement (26), une pompe haute pression (30), un dispositif de dosage (36) disposé hydrauliquement entre la pompe de pré-refoulement (26) et la pompe haute pression (30) et une conduite de refoulement nul (38) pour évacuer des fuites du dispositif de dosage (36), des moyens d'aspiration (40) étant disposés dans la conduite de refoulement nul (38) ou à son extrémité située en aval, lesquels moyens d'aspiration comportent un venturi (40), et le système de carburant (10) comprenant une soupape de régulation de pression (52) pour la régulation de la pression dans une zone basse pression située entre la pompe de pré-refoulement (26) et la pompe haute pression (30), caractérisé en ce que le venturi (40) est disposé dans une conduite de commande de fermeture (34) de la soupape de régulation de pression (52).
  2. Système de carburant (10) selon la revendication 1, caractérisé en ce que la conduite de commande de fermeture (34) fait partie d'une conduite de lubrification et/ou de refroidissement de la pompe haute pression (30), et en ce que la soupape de régulation de pression (52) présente une première pression d'ouverture à partir de laquelle elle raccorde la conduite de commande de fermeture (34) à une conduite de retour (54).
  3. Système de carburant (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la pompe haute pression (30) comporte au moins une conduite de recirculation (54) pour remettre en circulation un fuite de palier, et en ce qu'une soupape antiretour (74) sollicitée par ressort se bloquant en direction de la pompe haute pression (30) est disposée dans la conduite de recirculation (54).
  4. Système de carburant (10) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une soupape antiretour sollicitée par ressort ou une soupape de limitation de pression (80) est disposée parallèlement à la pompe de pré-refoulement (26), laquelle soupape s'ouvre en direction de l'entrée de la pompe de pré-refoulement.
  5. Système de carburant (10) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une soupape antiretour sollicitée par ressort ou une soupape de limitation de pression (78) est disposée parallèlement à la pompe de pré-refoulement (26), laquelle soupape s'ouvre en direction de l'entrée de la pompe haute pression.
EP10718151.3A 2009-06-30 2010-04-30 Système de carburant pour un moteur à combustion interne Active EP2449245B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009027335A DE102009027335A1 (de) 2009-06-30 2009-06-30 Kraftstoffsystem für eine Brennkraftmaschine
PCT/EP2010/055891 WO2011000599A1 (fr) 2009-06-30 2010-04-30 Système de carburant pour un moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP2449245A1 EP2449245A1 (fr) 2012-05-09
EP2449245B1 true EP2449245B1 (fr) 2013-08-14

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Application Number Title Priority Date Filing Date
EP10718151.3A Active EP2449245B1 (fr) 2009-06-30 2010-04-30 Système de carburant pour un moteur à combustion interne

Country Status (7)

Country Link
EP (1) EP2449245B1 (fr)
JP (1) JP5508526B2 (fr)
KR (1) KR101696498B1 (fr)
CN (1) CN102472219B (fr)
DE (1) DE102009027335A1 (fr)
RU (1) RU2556470C2 (fr)
WO (1) WO2011000599A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010043531A1 (de) * 2010-11-08 2012-05-10 Robert Bosch Gmbh Kraftstoffeinspritzsystem einer Brennkraftmaschine
DE102012212062A1 (de) * 2012-07-11 2014-01-16 Robert Bosch Gmbh Niederdruckkreislauf für ein Kraftstoffeinspritzsystem, Kraftstoffeinspritzsystem sowie Verfahren zum Betreiben eines Kraftstoffeinspritzsystems
DE102013208707A1 (de) * 2013-05-13 2014-11-13 Robert Bosch Gmbh Überstromventil für eine Hochdruckpumpe in einem Kraftstoffeinspritzsystem
DE102013212145A1 (de) * 2013-06-25 2015-01-08 Robert Bosch Gmbh Pumpe
DE102013226649A1 (de) * 2013-12-19 2015-06-25 Robert Bosch Gmbh Kraftstoffversorgungseinrichtung eines Kraftstoffeinspritzsystems einer Brennkraftmaschine sowie Überströmventil dazu
CN105332886B (zh) * 2014-06-26 2020-07-10 罗伯特·博世有限公司 泵组件
US9638153B2 (en) * 2015-02-20 2017-05-02 Ford Global Technologies, Llc Method for cooling a direct injection pump
US9670867B2 (en) * 2015-06-25 2017-06-06 Ford Global Technologies, Llc Systems and methods for fuel injection
JP6586931B2 (ja) * 2016-08-26 2019-10-09 株式会社デンソー リリーフ弁装置、および、それを用いる高圧ポンプ
GB2556078B (en) * 2016-11-17 2020-02-26 Delphi Tech Ip Ltd Venturi flow circuit
CN108150324B (zh) * 2017-12-27 2020-01-03 潍柴动力股份有限公司 用于发动机燃油***的高压油泵及发动机燃油***
DE102018211338A1 (de) * 2018-07-10 2020-01-16 Robert Bosch Gmbh Kraftstofffördereinrichtung für kryogene Kraftstoffe und Verfahren zum Betreiben einer Kraftstofffördereinrichtung
DE102020114417A1 (de) * 2020-05-29 2021-12-02 Liebherr-Components Deggendorf Gmbh Hochdruckpumpe

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SU1093573A1 (ru) * 1983-02-23 1984-05-23 Sheremet Pavel Z Система топливоподачи дизел
DE19810867C2 (de) * 1998-03-13 2000-02-24 Bosch Gmbh Robert Kraftstoffpumpen-Anordnung
DE19926308A1 (de) 1999-06-09 2000-12-21 Bosch Gmbh Robert Pumpenanordnung für Kraftstoff
DE10154133C1 (de) * 2001-11-03 2003-02-13 Bosch Gmbh Robert Kraftstoffsystem
JP3915718B2 (ja) * 2003-03-11 2007-05-16 株式会社デンソー 燃料供給ポンプ
JP2004316518A (ja) * 2003-04-15 2004-11-11 Denso Corp 高圧燃料供給装置
DE102006031685B4 (de) * 2005-08-11 2017-10-05 Andreas Stihl Ag & Co. Kg Verbrennungsmotor und Verfahren zu dessen Betrieb
DE102007000855B4 (de) * 2006-12-27 2020-06-10 Denso Corporation Kraftstofffördergerät und Speicherkraftstoffeinspritzsystem, das dieses aufweist

Also Published As

Publication number Publication date
DE102009027335A1 (de) 2011-01-05
CN102472219A (zh) 2012-05-23
WO2011000599A1 (fr) 2011-01-06
JP5508526B2 (ja) 2014-06-04
KR20120029445A (ko) 2012-03-26
CN102472219B (zh) 2015-06-17
EP2449245A1 (fr) 2012-05-09
KR101696498B1 (ko) 2017-01-13
JP2012531557A (ja) 2012-12-10
RU2012103044A (ru) 2013-08-27
RU2556470C2 (ru) 2015-07-10

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