EP2459865B1 - Hochdruck-einspritzsystem mit kraftstoffkühlung aus niederdruckbereich - Google Patents

Hochdruck-einspritzsystem mit kraftstoffkühlung aus niederdruckbereich Download PDF

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Publication number
EP2459865B1
EP2459865B1 EP10722121.0A EP10722121A EP2459865B1 EP 2459865 B1 EP2459865 B1 EP 2459865B1 EP 10722121 A EP10722121 A EP 10722121A EP 2459865 B1 EP2459865 B1 EP 2459865B1
Authority
EP
European Patent Office
Prior art keywords
fuel
high pressure
line
mixing point
return
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.)
Not-in-force
Application number
EP10722121.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2459865A1 (de
Inventor
Susanne Spindler
Jochen Walther
Dorothee Sommer
Stefan Kieferle
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 EP2459865A1 publication Critical patent/EP2459865A1/de
Application granted granted Critical
Publication of EP2459865B1 publication Critical patent/EP2459865B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • 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

Definitions

  • the invention relates to a high-pressure injection system, in particular to a high-pressure accumulator injection system for internal combustion engines, with a fuel tank, from which the fuel is passed via a fuel delivery pump and a line system to the high-pressure pump. Due to the compression of the fuel in the high-pressure pump, the fuel temperature rises.
  • the compressed fuel is passed from the high pressure pump through another line in a high-pressure accumulator, which in turn is connected to at least one fuel injection valve.
  • compressed fuel is injected from the fuel injection valve into a combustion chamber.
  • a portion of the fuel injection valve supplied fuel passes via leakage in the fuel injection valve or as a control amount from the fuel injection valve in the return line, wherein these leakage quantities additionally heat by relaxing when flowing through the fuel injection valve.
  • the invention is based on the recognition that in unfavorable conditions (almost empty fuel tank, small volume of fuel, which is often pumped in a circle) and corresponding load cases operating conditions may occur in which the fuel is heated above a permissible limit temperature, so that There is a deterioration (aging) of the fuel, which leads to the reduction of the lubricating properties of the fuel and thus to increased mechanical wear in the system. In addition, due to the increased return temperatures possibly more expensive materials for the execution of the return lines to use.
  • a cooling line is provided for admixing fuel from cooler regions of the low-pressure region between the fuel tank and the high-pressure pump, via which cooler fuel can be added to the fuel return.
  • a first embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling between a fuel pump and the high-pressure pump and this volume flow for cooling via a mixing point the leakage flow from the fuel injectors, which, for example, as a common rail Injectors can be executed.
  • the fuel pump is always ensured that a volume flow is available under sufficient pressure for cooling purposes, so that this design can do without further control mechanisms.
  • An advantage of this design is further that can be omitted by the fuel pump a prefeed pump on the high-pressure pump.
  • a further exemplary embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling from the prefeed pump arranged on the high-pressure pump and supplies this volume flow via a mixing point to the leakage flow from the fuel injection valves.
  • the prefeed pump directly to the high-pressure pump, which may for example be designed as a gear pump, which sucks a volume flow from the fuel tank, the fuel pump can be omitted.
  • An advantage of this design is that the cooling line can be made correspondingly short and therefore cost.
  • a further embodiment of the fuel injection system is characterized in that the cooling line leads directly from the fuel tank to the mixing point with the leakage flow from the fuel injection valve, wherein in the return line from the mixing point back to the fuel tank, for example, a suction pump is arranged so that in the Return line always a lower pressure than in the cooling line prevails.
  • a further exemplary embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling from a return of the high-pressure pump and supplies this volume flow via the mixing point to the leakage flow from the fuel injection valve.
  • An advantage of this design is that the return flow from the high-pressure pump delivers a comparatively large volume flow.
  • an existing return line from the high pressure pump can be arranged so that it connects the return to the mixing point, so that no additional components are needed.
  • the mixing point at which the cooling line and the leakage from the fuel injection valves meet arranged as close as possible to the fuel injection valve.
  • a further exemplary embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling from a return line of the high-pressure pump and this volume flow can be divided via a throttle or a valve so that a subset of the volume flow for cooling through the cooling line the mixing point is passed and another subset is connected directly via the return line of the high-pressure pump with the fuel return to the fuel tank.
  • An advantage of this design is that the volume flow used for cooling can be regulated by the cooling line accordingly.
  • Another embodiment of the fuel injection system is characterized in that a sensor for measuring temperature or a sensor for flow measurement is arranged at the mixing point, so that the volume flow through the cooling line, for example by an adjustable throttle or a valve can be controlled such that always a for Cooling sufficient volume flow through the cooling line is fed to the mixing point.
  • This embodiment has the advantage that, especially at lower system temperatures, no unnecessarily high volume flow is conveyed through the cooling line and thus the overall efficiency of the system is not unnecessarily reduced.
  • Fig. 1 is a well-known from the prior art high pressure injection system shown schematically. From a fuel tank 1, fuel is conveyed to a prefeed pump 4 and to a high-pressure pump 10 by means of a fuel feed pump 2 via a connecting line 3. The fuel tank 1, the fuel delivery pump 2, the connecting line 3 and the prefeed pump 4 are subjected to low pressure and are therefore assigned to the low-pressure region.
  • a fuel return 11 is arranged, which is connected via a return line 12 and a further return line 22 to the fuel tank 1.
  • a high-pressure lines 13 leads from the high-pressure pump 10, a high-pressure lines 13 to a high-pressure accumulator 14, which is also referred to as a common rail, which is connected via further high-pressure lines 15 to the fuel injection valves 20.
  • the presence of a high pressure accumulator 14 is not necessarily required.
  • the fuel compressed by the high-pressure pump 10 is injected by opening the fuel injection valves 20 into a combustion chamber.
  • a portion of the fuel injection valve 20 supplied fuel is expanded in the fuel injection valve 20 and passes as a control amount or leakage amount in the return line 21, which the fuel injection valve 20, possibly via a further return line 22, with that described in paragraph 1 Low pressure range, in particular with the fuel tank 1 connects.
  • the flow direction of the fuel is shown in the schematic drawing in each case by arrows next to the corresponding lines.
  • a pressure relief valve 16 is arranged, which is connected via the return line 17 with a mixing point 24 at which meet the flow rates from the return line 17 from the pressure relief valve 16 and the return line 21 from the fuel injection valve 20 and from where this Volumetric flow passes through a further return line 22 into the fuel tank 1. If the pressure in the high-pressure accumulator 14 exceeds a maximum predetermined value, then the pressure relief valve 16 opens and the overpressure in the high-pressure accumulator 14 is reduced by the venting of fuel into the return line 17.
  • cooler fuel from the low-pressure region is mixed with the leakage amount from the fuel injection valve by means of a cooling line to reduce the temperatures in the return lines 21 and 22.
  • Fig. 2 a first embodiment of the high-pressure injection system according to the invention is shown, compared to the illustration in Fig. 1 contains an additional cooling line 5, which leads from the low-pressure region of the injection system to a mixing point 23 at which the cooler fuel from the cooling line 5 mixed with the fuel from the leakage of the fuel injection valve 20 and thus the temperature in the return lines 21 and 22nd lowered accordingly.
  • the cooling line 5 is fed by the fuel delivery pump 2, so that the fuel can flow through the cooling line 5 to the mixing point 23.
  • the fuel delivery pump 2 is controlled so that always a sufficient amount of cooler fuel is conveyed through the cooling line 5 to the mixing point 23.
  • the fuel delivery pump 2 is to be designed so that the pressure in the connecting line 3 and the cooling line 5 is always higher than the pressure at the mixing point 23, so that the flow direction as shown in FIG Fig. 2 established.
  • the prefeed pump 4 can be omitted.
  • Fig. 3 a further embodiment of the high-pressure injection system according to the invention is shown, in which the additional cooling line 5 is arranged between the prefeed pump 4 and the mixing point 23, via which cooler fuel from the low-pressure region is pumped to the mixing point 23, wherein the prefeed pump must be designed so that it generates a pressure higher than the pressure in the return line 21 in order to ensure the flow direction from the mixing point 23 via the return lines 21 and 22 to the fuel tank 1. If the prefeed pump 4 has sufficient suction power to draw in the fuel from the fuel tank 1, the fuel feed pump 2 can be dispensed with.
  • Fig. 4 another embodiment is shown in which the cooling line 5 is disposed between the return 11 of the high-pressure pump 10 and the mixing point 23 of the volume flows from the leakage of the fuel injection valve 20, wherein the return 11 of the high-pressure pump 10 must be designed so that in the return 11, a higher pressure than the pressure in the return line 21 prevails in order to ensure the flow direction from the mixing point 23 via the return lines 21 and 22 to the fuel tank 1.
  • the return line 12 of the high-pressure pump 10 is omitted.
  • either the fuel delivery pump 2 or the feed pump 4 can be omitted.
  • Fig. 5 another embodiment is shown, in which the cooling line 5 is arranged between the fuel tank 1 and the mixing point 23.
  • a vacuum pump 25 is arranged in the return line 22, wherein the vacuum pump 25 must be designed so that in the return 21 and 22, a lower pressure than in the cooling line 5 and the mixing point 23 prevails, the flow direction from the mixing point 23 via the return lines 21st and 22 to ensure the fuel tank 1.
  • either the fuel pump 2 or the feed pump 4 can be omitted.
  • Fig. 6 another embodiment is shown, which differs from the representation in Fig. 2 the return line 17 between pressure relief valve 16 and mixing point 23 is arranged, wherein the return line 17 can be made shorter than in the other embodiments.
  • Fig. 7 another embodiment is shown, wherein different from Fig. 4 the cooling line 5 is not fed directly from the return 11 of the high-pressure pump 10, but the volume flow in the cooling line 5 is regulated by a arranged in the return line 12 of the high-pressure pump 10 valve 7.
  • Fig. 8 another embodiment is shown, wherein different from Fig. 7 the volume flow through the return line 12 of the high pressure pump 10 is limited by a throttle 6 and thus ensures that always a sufficient volume flow through the cooling line 5 reaches the mixing point 23.
  • a flow meter 26 is arranged between the fuel injection valves 20 and the mixing point 23 and a temperature sensor 27 at the mixing point 23, with which the flow through the cooling line 5 via the valve 7 is controlled.
  • this control can be controlled both via both parameters (flow and temperature) and via one of the two parameters.
  • the measuring element for the other measured variable can then be omitted.
  • a controllable valve 7 can also be analog Fig. 8 a variable throttle 6 can be used instead of the valve 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP10722121.0A 2009-07-27 2010-06-08 Hochdruck-einspritzsystem mit kraftstoffkühlung aus niederdruckbereich Not-in-force EP2459865B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009028023A DE102009028023A1 (de) 2009-07-27 2009-07-27 Hochdruck-Einspritzsystem mit Kraftstoffkühlung aus Niederdruckbereich
PCT/EP2010/057966 WO2011012363A1 (de) 2009-07-27 2010-06-08 Hochdruck-einspritzsystem mit kraftstoffkühlung aus niederdruckbereich

Publications (2)

Publication Number Publication Date
EP2459865A1 EP2459865A1 (de) 2012-06-06
EP2459865B1 true EP2459865B1 (de) 2015-03-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP10722121.0A Not-in-force EP2459865B1 (de) 2009-07-27 2010-06-08 Hochdruck-einspritzsystem mit kraftstoffkühlung aus niederdruckbereich

Country Status (6)

Country Link
US (1) US20120118268A1 (zh)
EP (1) EP2459865B1 (zh)
JP (1) JP2013500429A (zh)
CN (1) CN102472217B (zh)
DE (1) DE102009028023A1 (zh)
WO (1) WO2011012363A1 (zh)

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CN105332836A (zh) * 2015-11-25 2016-02-17 常州机电职业技术学院 喷油器自洁方法
DE102016001360A1 (de) 2016-01-20 2017-07-20 Karlheinrich Winkelmann Verfahren und Vorrichtung zur Kühlung von Kraftstoff von Verbrennungskraftmaschinen bei gleichzeitiger Konditionierung ihrer Verbrennungsluft
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Also Published As

Publication number Publication date
EP2459865A1 (de) 2012-06-06
WO2011012363A1 (de) 2011-02-03
US20120118268A1 (en) 2012-05-17
DE102009028023A1 (de) 2011-02-03
CN102472217B (zh) 2014-07-09
JP2013500429A (ja) 2013-01-07
CN102472217A (zh) 2012-05-23

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