WO2012155162A1 - Ensemble pompe à haute pression destinée à pomper du carburant depuis un réservoir dans un récipient à haute pression - Google Patents

Ensemble pompe à haute pression destinée à pomper du carburant depuis un réservoir dans un récipient à haute pression Download PDF

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Publication number
WO2012155162A1
WO2012155162A1 PCT/AT2012/000125 AT2012000125W WO2012155162A1 WO 2012155162 A1 WO2012155162 A1 WO 2012155162A1 AT 2012000125 W AT2012000125 W AT 2012000125W WO 2012155162 A1 WO2012155162 A1 WO 2012155162A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
pressure
fuel
line
metering unit
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.)
Ceased
Application number
PCT/AT2012/000125
Other languages
German (de)
English (en)
Inventor
Günther PRUMMER
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
Priority to EP12721698.4A priority Critical patent/EP2710252B1/fr
Publication of WO2012155162A1 publication Critical patent/WO2012155162A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails
    • F02M63/027—More than one high pressure pump feeding a single common rail
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0275—Arrangement of common rails
    • F02M63/028—Returnless common rail 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
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston

Definitions

  • High pressure pump assembly for pumping fuel from a tank into a high pressure vessel
  • the invention relates to a high-pressure pump arrangement for pumping fuel from a tank into a high-pressure vessel, wherein at least one of pump cylinder and pump piston existing pump element is provided, the pump chamber via a suction valve with a fed by a fuel supply pump suction and a pressure valve with the high-pressure vessel in combination wherein the pump element has a leakage line for returning leakage fuel flowing between the pump piston and the pump cylinder into the pump suction space, and wherein the fuel supply comprises a metering unit and at least one purge line having a throttle for discharging one of the metering unit from the fuel supply downstream of the metering unit Flushing leads away in a low pressure range.
  • Such high-pressure pump arrangements are used, for example, in so-called “common-rail systems" in which the high-pressure pump serves to pump fuel from a fuel tank into a high-pressure vessel, the so-called rail, the fuel in the high-pressure vessel being kept under sufficient pressure. to allow injection of the fuel into the combustion chamber of the internal combustion engine.
  • the high pressure pump provides the high pressure fuel stored in the rail for all operating conditions of the engine. In some dynamic operating points, the flow rate of the high pressure pump must be above the full load required by the engine stationary. On the other hand, however, only a small flow rate of the high pressure pump is required at part load or idling of the engine.
  • the regulation of the flow rate of the high-pressure pump in the rail takes place via an electronically controlled metering unit which determines the inflow quantity to the high-pressure pump as a function of the fuel pressure in the rail.
  • a heating of the fuel is on the one hand in principle desirable when using fuel with high viscosity and high proportion of abrasive solids, so-called heavy oil, since the promotion and injection of heavy oil heating up to 150 ° is required to achieve the necessary injection viscosity ,
  • heating of the pump elements can be observed to an extent which can lead to undesirably high temperatures, especially at low flow rates.
  • a controlled metering unit of the high-pressure fuel supplied by the high-pressure pump in spite of the lower losses, there is a significant heating of the pump units designed as piston pumps.
  • the pump elements of a high pressure pump are usually arranged in series, with 2 to 6 cylinders side by side usual. A V or W arrangement in several rows is possible. In this case, the pump elements further away from the metering unit receive a low-pressure fuel, which has already flushed through one or more suction chambers of pump elements and was warmed up accordingly.
  • conventional high-pressure pumps lent between the pump piston and pump cylinder from the pump room down through leaking fuel collected, for example, in an annular groove and returned through a leak oil hole in the suction chamber, as shown in Figure 2.
  • the leakage quantities are of the order of magnitude of the metering quantities and lead to an undesirably high and uneven heating of the high-pressure pump due to the said recirculation and the resulting circulation.
  • the pump elements furthest from the fuel supply line are thereby heated the most. This reduces the delivery rate of these elements and also adversely affects their service life.
  • High-pressure pump arrangements known from the prior art have a flushing line with a throttle arranged in the flushing line between the metering unit and the pump elements. This line is also referred to as a zero feed line, and the corresponding throttle as a zero feed throttle.
  • This flushing line or zero delivery line comes into play when fuel is not to be delivered by the high-pressure pump arrangement, the metering unit is closed accordingly and systematically even with closed metering unit still fuel exiting from the outlet.
  • the purge line branches off from the fluid connection present between the metering unit and the suction valve, which leads to a low-pressure area.
  • About the purge line exiting the closed metering unit leakage fuel is kept away from the high-pressure fuel pump. This happens because at relatively low differential pressure, the leakage quantity of the closed metering unit into the flushing line and from there into the low pressure rich, without the opening pressure of the suction valve is exceeded.
  • the minimum required opening pressure of the suction valve is thereby determined by the pressure level in the low pressure area plus the required pressure difference across the zero feed throttle, which is required to discharge the leaking from the metering leakage fuel, minus the minimum pressure in the working space of the high pressure fuel umpe during the intake.
  • a high-pressure pump assembly of the type mentioned is inventively developed such that the at least one purge line is in communication with the pump suction, so that the pump suction is flowed through by the flushing.
  • the invention thus consists essentially in that the flushing line. is connected to the pump suction of at least one pump element for discharging the leaking at the closed metering leakage fuel.
  • the throttle in the purge line is in this case dimensioned such that the passing through the metering unit fuel quantity is dissipated so that the opening pressure of the suction valves of the pump elements is not exceeded when no high-pressure delivery is desired. Only when the metering unit meters larger amounts of fuel can not be discharged from the throttle in the purge line enough fuel, whereby the opening pressure of the suction valves is exceeded and fuel enters the pump chamber of the pump elements.
  • the invention is preferably embodied such that a supply line of the fuel feed opens into the pump suction space and leads away from the pump suction space a separate discharge for the flushing quantity.
  • the high-pressure pump arrangement comprises a multi-piston pump
  • the invention is advantageously further developed in that a plurality of pump elements connected in at least one row are provided, the pump suction chambers of which are in communication with one another and are supplied with fuel from the fuel supply in succession , And that at the end of the row arranged pump element the Flush line is connected.
  • the high-pressure pump arrangement according to the invention is further developed such that downstream of the metering unit, another purge line having a throttle leads away into a low-pressure area for discharging a purge volume coming from the metering unit, this further purge line being arranged upstream of the pump suction chamber.
  • This further purge line is thus arranged at a point in the circuit which corresponds to the order of the previously known purge line.
  • flushing quantities can be discharged directly into the low-pressure region of the high-pressure pump arrangement, however, a preferred embodiment of the present invention results if the flushing line is connected downstream of the restrictor to a cooling system of a high-pressure fuel line.
  • cooling systems of high-pressure fuel lines are known from the prior art and are for example in a double-walled piping system of the high-pressure lines, wherein the relatively cool fuel from the purge line or from the purge lines is passed through the outer lumen of the double-walled high-pressure lines, whereby the inner fuel line and the therein high pressure fuel to be cooled.
  • FIG. 2 shows a section according to the line II-II of Fig.l
  • Figure 3 shows the structure of a high-pressure pump assembly according to the present invention
  • 4 shows a block diagram of a high-pressure pump arrangement according to the prior art
  • FIG. 5 shows a block diagram of the high-pressure pump arrangement according to the invention.
  • the pump piston 4 moves in the pump cylinders 5 of the individual pump elements up and down.
  • the contact between see roller tappet 3 and cam 1 is maintained by compression springs 6.
  • the quantity of fuel determined by the metering unit is sucked in via a suction valve 7 and then pressed into the rail during the upward gear via a pressure valve 8.
  • the fuel pumping down between the pump piston 4 and the pump cylinder 5 from the pump chamber 9 is collected in an annular groove 10 and returned through a leakage oil bore 11 into the pump suction chamber 12, as shown in FIGS. 1 and 2.
  • the leakage quantities are of the order of magnitude of the metering quantities and lead to an undesirably high and uneven heating of the high-pressure pump.
  • the pump elements furthest from the fuel supply line are thereby heated the most.
  • FIGS. 4 and 5 the interconnection of the individual components of the high-pressure pump arrangement can be seen particularly clearly.
  • fuel is supplied from the tank to the low-pressure pump 17, which delivers the fuel at a constant rate to the metering unit 15.
  • the metering unit 15 controls the amount of fuel that reaches the pump elements.
  • a return line 18 is provided with a suitable non-return valve 19 in order to reclaim unneeded fuel into the fuel feed from the tank.
  • the fuel passes to the metering unit 15 to the pump elements 14 to 14c, where the promotion to high pressure and the high-pressure fuel in the Hoch horrsamm- ler 20 collected and fed via a line 21 to the injectors of the injection system.
  • a flushing or zero delivery line 22 with a zero feed throttle 23 is arranged between the metering unit 15 and the pump elements or their suction chambers, so that the fuel coming from the metering unit 15 is superfluously attributed to the pump elements 14 to 14c, is discharged into the low-pressure region of the injection system or the high-pressure pump assembly without the pump elements 14 to 14c are reached.
  • flushing lines 24, 24 ' are arranged in the flow direction downstream of the pump elements 14 to 14c, so that a flushing quantity which is conducted from the metering unit 15 in the direction of the pump elements 14 to 14c Pump suction of the pump elements 14 to 14 c flows through before the flushing lines 24 and 24 'are achieved with the corresponding throttles 25 and 25'. After the throttles 25 or 25 ', a discharge of the flushing quantity takes place either directly into the low-pressure rich or the tank of the injection device, or the flushing amount is, as already described above, used for cooling the high-pressure fuel lines.
  • a further bypass line is arranged at the position of the zero delivery line or purge line 22 from the prior art, which also has a throttle 27.
  • this bypass line even with the metering unit completely closed, a minimal amount of flushing can be conveyed to the pump elements 14 to 14c, so that corresponding cooling of the pump elements or the suction chambers of the pump elements takes place even in the zero flow case.

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

L'invention concerne un ensemble pompe à haute pression destiné à pomper du carburant depuis un réservoir dans un récipient à haute pression, au moins un élément pompe constitué d'un cylindre de pompe et d'un piston de pompe présentant une chambre de pompe pouvant être reliée, par l'intermédiaire d'une soupape d'aspiration, à une chambre d'aspiration alimentée par une amenée de carburant et, par l'intermédiaire d'une soupape de refoulement, au récipient à haute pression. L'élément pompe comporte une conduite de fuite destinée à recycler le carburant de fuite s'écoulant entre le piston de pompe et le cylindre de pompe dans la chambre d'aspiration ; l'amenée de carburant comporte une unité de dosage ; et au moins une conduite de balayage comportant un papillon et destinée à évacuer une quantité de balayage venant de l'unité de dosage dans une zone basse pression, part de l'amenée de carburant en aval de l'unité de dosage. La ou les conduites de balayage (24, 24') sont reliées à la chambre d'aspiration (12), de telle sorte que la quantité de balayage traverse la chambre d'aspiration (12).
PCT/AT2012/000125 2011-05-18 2012-05-03 Ensemble pompe à haute pression destinée à pomper du carburant depuis un réservoir dans un récipient à haute pression Ceased WO2012155162A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12721698.4A EP2710252B1 (fr) 2011-05-18 2012-05-03 Ensemble pompe à haute pression destinée à pomper du carburant depuis un réservoir dans un récipient à haute pression

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA708/2011 2011-05-18
AT7082011A AT511504B1 (de) 2011-05-18 2011-05-18 Hochdruckpumpenanordnung zum pumpen von brennkraftstoff aus einem tank in einen hochdruckbehälter

Publications (1)

Publication Number Publication Date
WO2012155162A1 true WO2012155162A1 (fr) 2012-11-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT2012/000125 Ceased WO2012155162A1 (fr) 2011-05-18 2012-05-03 Ensemble pompe à haute pression destinée à pomper du carburant depuis un réservoir dans un récipient à haute pression

Country Status (3)

Country Link
EP (1) EP2710252B1 (fr)
AT (1) AT511504B1 (fr)
WO (1) WO2012155162A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021102709A1 (de) 2021-02-05 2022-08-11 Joachim Risse Hochdruckpumpe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004111437A1 (fr) * 2003-05-27 2004-12-23 Robert Bosch Gmbh Dispositif pour regler une section d'ecoulement variable
US20090159053A1 (en) * 2007-12-21 2009-06-25 Caterpillar Inc. Pumping element for a fluid pump and method
US20100226795A1 (en) * 2009-03-05 2010-09-09 Cummins Intellectual Properties, Inc. High pressure fuel pump with parallel cooling fuel flow

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11280603A (ja) * 1998-03-27 1999-10-15 Aisan Ind Co Ltd 高圧燃料供給ポンプ
JP2000297674A (ja) * 1999-04-15 2000-10-24 Aisan Ind Co Ltd 高圧燃料ポンプシステム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004111437A1 (fr) * 2003-05-27 2004-12-23 Robert Bosch Gmbh Dispositif pour regler une section d'ecoulement variable
US20090159053A1 (en) * 2007-12-21 2009-06-25 Caterpillar Inc. Pumping element for a fluid pump and method
US20100226795A1 (en) * 2009-03-05 2010-09-09 Cummins Intellectual Properties, Inc. High pressure fuel pump with parallel cooling fuel flow

Also Published As

Publication number Publication date
EP2710252B1 (fr) 2016-03-23
AT511504A1 (de) 2012-12-15
EP2710252A1 (fr) 2014-03-26
AT511504B1 (de) 2013-11-15

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