EP2449245A1 - Système de carburant pour un moteur à combustion interne - Google Patents

Système de carburant pour un moteur à combustion interne

Info

Publication number
EP2449245A1
EP2449245A1 EP10718151A EP10718151A EP2449245A1 EP 2449245 A1 EP2449245 A1 EP 2449245A1 EP 10718151 A EP10718151 A EP 10718151A EP 10718151 A EP10718151 A EP 10718151A EP 2449245 A1 EP2449245 A1 EP 2449245A1
Authority
EP
European Patent Office
Prior art keywords
pressure
pump
fuel
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.)
Granted
Application number
EP10718151A
Other languages
German (de)
English (en)
Other versions
EP2449245B1 (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
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2449245A1 publication Critical patent/EP2449245A1/fr
Application granted granted Critical
Publication of EP2449245B1 publication Critical patent/EP2449245B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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.
  • DE 199 26 308 A1 shows a common rail fuel system in which a prefeed pump delivers a fuel flow via a fuel line from a tank to a high-pressure pump. Between pre-feed pump and
  • High-pressure pump is arranged a metering device with which the amount of fuel reaching the high-pressure pump can be influenced.
  • a zero feed line in which a zero-feed throttle is arranged, opens.
  • About the zero feed line is one when closed
  • the object of the invention is to improve the efficiency of the fuel system.
  • suction means is a pressure reduction in the zero feed line or at the end, so that an opening pressure of an intake valve of the
  • High pressure pump can remain low, which improves their efficiency (the opening pressure of the intake valve must always be higher than the highest occurring pressure level plus the required differential pressure across the zero delivery line and possibly there existing zero flow throttle with a safety margin and taking into account a lifetime drift).
  • the diameter of the zero feed throttle can be kept relatively small, so that in the normal delivery case only comparatively little fuel on the zero feed line "lost". This improves the filling of a delivery chamber of the high-pressure pump, and especially when starting the efficiency when the necessary pressure for this almost alone must be applied by the prefeed pump.
  • the suction means comprise a Venturi nozzle.
  • the zero feed line opens into that region of the Venturi nozzle, in which the lowest pressure prevails.
  • a Venturi nozzle builds easily and without moving parts. It is therefore inexpensive and works practically wear-free. Since in a fuel system almost always necessary for the operation of a venturi fuel flows are present, no additional drives for the Venturi nozzle are necessary.
  • the fuel system has a pressure regulating valve for regulating the pressure in a lying between the feed pump and high pressure pump low pressure region, and when the Venturi nozzle is arranged in a Abêtön the pressure control valve.
  • Pressure control valve controls in general then a lot of fuel from when the metering device is closed.
  • the suction power of the Venturi nozzle is particularly large if and only if due to the closed
  • the invention works even more effectively when the spill line, in which the venturi nozzle is arranged, opens into a feed line to the prefeed pump. This makes it possible to promote the leakage fuel immediately back to the input of the prefeed pump to him back into the fuel circuit for operating the internal combustion engine or for lubricating and cooling the
  • the diversion line in which the Venturi nozzle is arranged, opens into a return line, which leads back into a fuel tank.
  • the recirculated fuel may cool in the fuel tank, which facilitates the temperature management of the fuel system.
  • the Venturi nozzle is arranged in a feed line of the pressure regulating valve. If the pressure regulating valve has a plurality of diversion lines, to which different opening pressures of the pressure regulating valve are assigned, the function of the Venturi nozzle is ensured, regardless of which diversion line is currently active.
  • 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 is already at a comparatively low pressure in the low pressure range,
  • Return line for returning a bearing leakage comprises, 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. It is also advantageous that 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.
  • Pressure relief valve has the task, for example, in the case of using a pressure-side fuel filter (upstream of the prefeed pump) in a possible blockage of the filter the
  • Pre-feed pump to protect against overload.
  • 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. This valve is when filling a bypass to the feed pump, so not the entire
  • Fuel must be pumped through the pre-feed pump for filling.
  • FIG. 1 shows a fuel system in a first embodiment with a
  • Figure 2 is a sectional view of the Venturi nozzle of Figure 1;
  • FIG. 3 shows a fuel system in a second embodiment with a
  • Figure 4 shows a fuel system in a third embodiment with a
  • Zero delivery line which opens in a Venturi nozzle in a return line of a pressure control valve
  • Figure 5 shows the fuel system of Figure 1 with a check valve in one
  • FIG. 6 shows the fuel system of Figure 1 with a check valve in one
  • Figure 7 shows a fuel system in a fourth embodiment with a
  • High-pressure pump of Figure 1 is arranged.
  • 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 is conveyed under high pressure into a fuel rail (common rail) 14 and stored there, wherein 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.
  • fuel rail common rail
  • the fuel is from a fuel tank 20 of a motor vehicle
  • Fuel path opens first for lubrication of drive parts in one
  • 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 in the drawing with arrows
  • 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 a service line 32 to
  • 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 branches off a zero feed line 38, 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 from the metering device 36, which discharges via a suction valve 44 into a delivery chamber 46 of the high-pressure pump 30, which via a blocking to the high pressure pump 30 back
  • Check valve 48 is connected to the fuel rail 14.
  • 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 control valve 52 which acts as a spring-loaded
  • Piston spool valve is designed with two switching stages.
  • Supply return 34 thus also provides the control of the
  • the pressure control valve 52 includes 34 adjacent to the input for the supply return line three outputs.
  • 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 jerk in the supply return line 34 - the fuel 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 Abêtönen 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.
  • 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 Figure 1 as chokes
  • the leakage of the bearings 63 is returned via the return line 54 to the fuel tank 20.
  • Venturi nozzle 40 is shown in section in FIG. It consists of a smooth-walled on an outer tube 64 with a narrowing of the inner cross-section D by 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 inside the tube
  • 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 in the flow direction 70 has a length 3-5D of about three to five times the length of the tapered
  • 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 also alternatively as a
  • venturi 40 functions as follows in the present invention:
  • Zero delivery throttle 72 a correspondingly low pressure. This creates between the mouth of the zero feed throttle 72 in the interior of the Venturi nozzle 40 and the beginning of the zero feed line 38, a pressure difference through which
  • the fuel system 10 in the embodiment shown in Figure 1 thus operates as follows:
  • Fuel tank 20 sucked through the fuel delivery line 22.
  • the fuel is filtered in the fuel filter 24.
  • fuel is supplied to the operation of the internal combustion engine 12 via the operating line 32 of the open metering device 36, after which the fuel via the suction valve 44 then into the delivery chamber 46 of the High-pressure pump 30 passes. There, the fuel is compressed and introduced under high pressure via the check valve 48 in 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 by this, the fuel flow through the
  • Pressure control valve 52 is initially closed so that the largest possible fuel pressure can be established with open metering device 36 via the operating line 32.
  • 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 tube 64, a greater suction than partially or fully open metering device 36.
  • the Venturi nozzle 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 a second embodiment of the invention.
  • the same reference numerals and will not be explained in detail again lie in the arrangement of the Venturi nozzle 40.
  • this is arranged in the supply line 34, that is to say in the feed line of the pressure regulating valve 52.
  • the function of this embodiment is substantially identical to the described function of the embodiment in Figure 1.
  • the Venturi nozzle 40 also operates at relatively low flow through the feed line 34.
  • FIG. 4 shows a third embodiment of the invention.
  • the essential elements and regions that are functionally equivalent to elements and regions of the fuel system of Figure 1 the same reference numerals and will not be explained in detail again.
  • the difference from FIG. 1 lies in the arrangement of the Venturi nozzle 40.
  • the supply line 34 that is to say in the feed line of the pressure regulating valve 52.
  • the function of this embodiment is substantially identical to the described function of the embodiment in Figure 1.
  • the Venturi nozzle 40 also operates at relatively low flow through the feed line 34.
  • FIG. 4 shows a third embodiment of the
  • Figure 5 shows an extension to Figure 1. Here is additionally in the
  • Fuel system 10 are built faster and easier.
  • FIG. 6 shows a modification of FIG. 5, in which the check valve 74 is arranged in a line for removing bearing leaks of the high-pressure pump 30 to the fuel delivery line 22.
  • Aue here is the check valve 74 to limit the bearing leakage in the starting case.
  • Figure 7 shows a fourth embodiment of the invention and is a modification of Figure 5. However, this embodiment is also applicable to the others
  • Pre-feed pump 26 was arranged, here is the fuel filter 24 on the
  • a hand pump 76 is preferably provided for filling the fuel system after repair or maintenance. In the flow direction, two front and rear of the hand pump 76 to the fuel tank 20 blocking out
  • Check valve 78 and in the direction of feed pump inlet opening spring-loaded check valve 80 is provided.
  • the check valve 78 serves as a bypass when filling the fuel system 10, so that not all the fuel for filling by the feed pump 26 must be pumped.
  • the check valve 80 protects in case of blockage of the

Landscapes

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

Abstract

La présente invention concerne un système de carburant (10) pour un moteur à combustion interne (12) notamment d'un véhicule à moteur, lequel comporte une pompe de pré-alimentation (26), une pompe à haute pression (30), un dispositif de dosage (36) disposé hydrauliquement entre la pompe de pré-alimentation (26) et la pompe à haute pression (30) et un conduit à refoulement nul (38) pour évacuer des fuites du dispositif de dosage (36). Dans le système de carburant (10), des moyens d'aspirations sont disposés dans le conduit à refoulement nul (38) ou à son extrémité aval.
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 true EP2449245A1 (fr) 2012-05-09
EP2449245B1 EP2449245B1 (fr) 2013-08-14

Family

ID=42338242

Family Applications (1)

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)

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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 用于发动机燃油系统的高压油泵及发动机燃油系统
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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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

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Also Published As

Publication number Publication date
CN102472219B (zh) 2015-06-17
JP5508526B2 (ja) 2014-06-04
RU2012103044A (ru) 2013-08-27
KR101696498B1 (ko) 2017-01-13
RU2556470C2 (ru) 2015-07-10
WO2011000599A1 (fr) 2011-01-06
JP2012531557A (ja) 2012-12-10
EP2449245B1 (fr) 2013-08-14
DE102009027335A1 (de) 2011-01-05
CN102472219A (zh) 2012-05-23
KR20120029445A (ko) 2012-03-26

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