EP2917554B1 - Kraftstoffeinspritzungsanordnung - Google Patents

Kraftstoffeinspritzungsanordnung Download PDF

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Publication number
EP2917554B1
EP2917554B1 EP13792715.8A EP13792715A EP2917554B1 EP 2917554 B1 EP2917554 B1 EP 2917554B1 EP 13792715 A EP13792715 A EP 13792715A EP 2917554 B1 EP2917554 B1 EP 2917554B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
fuel
valve
injection valve
duct
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
EP13792715.8A
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English (en)
French (fr)
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EP2917554A1 (de
Inventor
Anton Wintersteller
Mikael Troberg
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.)
Wartsila Finland Oy
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Wartsila Finland Oy
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Publication of EP2917554A1 publication Critical patent/EP2917554A1/de
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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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/44—Valves, e.g. injectors, with valve bodies arranged side-by-side

Definitions

  • the present invention relates to a fuel injection arrangement for injecting liquid fuel into a cylinder of a piston engine in accordance with the preamble of claim 1.
  • each cylinder of the engine can be provided with more than one fuel injector.
  • dual-fuel engines can be provided with one injector for the operation on liquid fuel and with another injector for injecting a small amount of liquid pilot fuel when the engine is operated on a gaseous fuel.
  • engines using only liquid fuel can be provided with different injectors for different loads.
  • a problem concerning especially dual-fuel engines is that the amount of fuel injected through one of the fuel injectors is very small.
  • these engines are usually provided with conventional fuel injection pumps for supplying the fuel at a high pressure to the fuel injectors when the engine is operated on a liquid fuel, and with a common rail system for supplying the liquid fuel to the pilot fuel injectors when the engine is operated on a gaseous fuel.
  • This kind of system enables very small injection amounts and makes it possible to meet even very stringent emission regulations.
  • two separate fuel injection systems increase the complexity of the engine.
  • Such a system is known for example from the document GB2003550 A .
  • the object of the present invention is to provide an improved fuel injection arrangement for injecting liquid fuel into a cylinder of a piston engine.
  • the characterizing features of the arrangement according to the invention are given in the characterizing part of claim 1.
  • a fuel injection arrangement comprises a first fuel injection valve, a second fuel injection valve, a pressure medium source for supplying fuel to the first fuel injection valve and to the second fuel injection valve, a selector valve for selectively allowing flow from the pressure medium source to the first fuel injection valve or to the second fuel injection valve, a fuel supply duct for connecting the pressure medium source to the selector valve, a first fuel duct for connecting the first fuel injection valve to the selector valve, and a second fuel duct for connecting the second fuel injection valve to the selector valve.
  • the arrangement further comprises means for regulating pressure in the second fuel duct between the selector valve and the second fuel injection valve.
  • the same source of pressurized fuel can be used for supplying fuel to different fuel injectors that are used for injecting different amounts of fuel at different pressures.
  • the need for separate fuel supply systems for the different fuel injection valves can thus be eliminated, which helps to make the fuel injection system less complicated and expensive.
  • the pressure medium source can be a high-pressure fuel injection pump.
  • the second fuel injection valve can be, for instance, a pilot fuel valve, which is configured for injecting smaller amounts of fuel than the first fuel injection valve.
  • the arrangement comprises means for controlling opening and/or closing timing of the second fuel injection valve.
  • the means can be for example a control valve. This enables accurate control of the timing of the second fuel injection valve and of the amount of fuel injected through the second fuel injection valve.
  • the arrangement comprises an overflow duct branching from the second fuel duct and a throttle that is arranged in the overflow duct for regulating the pressure in the second fuel duct.
  • a pressure reducing valve can be used for regulating the pressure in the second fuel duct.
  • the fuel injection arrangement according to the invention is suitable particularly for large internal combustion engines, such as main or auxiliary engines of ships, engines of offshore applications or engines that are used at power plants for producing electricity.
  • the invention is beneficial especially in dual-fuel engines, which can be operated both on liquid and gaseous fuel, and in which a small amount of liquid pilot fuel is used when the engine is operated in a gas mode.
  • the invention can also be utilized in other engines, in which two or more fuel injectors are used for each cylinder.
  • Figure 1 shows a schematic view of a fuel injection arrangement according to an embodiment of the invention.
  • the arrangement comprises a first fuel injection valve 1 and a second fuel injection valve 2, which are arranged to inject liquid fuel into a cylinder 11 of a piston engine.
  • the second fuel injection valve 2 is configured for injecting smaller amounts of fuel than the first fuel injection valve 1.
  • the second fuel injection valve 2 is a pilot fuel valve, which is used in a dual-fuel engine for injecting a small amount of liquid fuel into the cylinder 11. Burning liquid fuel initiates combustion of the gas-air mixture in the cylinder 11.
  • the second fuel injection valve 2 could also be used in other than dual-fuel engines for injecting fuel at low loads.
  • Each cylinder 11 of the engine is provided with a similar fuel injection arrangement.
  • the fuel injection valves 1, 2 are part of a fuel injection unit 12, which is used for injecting the fuel directly into the combustion chamber of the cylinder 11.
  • the fuel injection valves 1, 2 do not need to be arranged in a common fuel injection unit, but they can also be separate and one or both of the fuel injection valves 1, 2 could also be used for injecting fuel into a pre-combustion chamber.
  • Both fuel injection valves 1, 2 are of a conventional type.
  • Each fuel injection valve 1, 2 comprises a nozzle 1 a, 2a, which is arranged at the end of the fuel injection valve 1, 2, and a fuel gallery 1 d, 2d, which is arranged inside the body of the fuel injection valve 1, 2.
  • Each fuel injection valve 1, 2 is also provided with a valve needle 1 b, 2b for opening and closing flow communication between the fuel gallery 1 d, 2d and the nozzle 1 a, 2a.
  • the valve needle 1 b, 2b is kept in a closed position by a spring 1 c, 2c.
  • Many other constructions of the fuel injection valves 1, 2 are possible instead of the construction shown in the figure.
  • the valve needles 1 b, 2b could be coaxial and both fuel injection valves 1, 2 could utilize a common nozzle part having separate nozzle holes for each of the fuel injection valves 1, 2.
  • Both fuel injection valves 1, 2 are connected to a pressure medium source 3, which is in the embodiment of the figure a high-pressure fuel injection pump.
  • the fuel does not need to be supplied to the fuel injection valves 1, 2 directly from the fuel injection pump 3, but it can be pressurized by the pump 3 and stored in a chamber before being supplied to the fuel injection valves 1, 2.
  • the pump 3 is a conventional fuel injection pump, which can be adjusted for choosing appropriate fuel injection timing and quantity at different loads.
  • the fuel injection arrangement is provided with a fuel supply duct 5 for delivering the fuel from the fuel injection pump 3 to the fuel injection valves 1, 2.
  • the selector valve 4 is a three-way valve, which is provided with one inlet port 4a and with a first outlet port 4b and a second outlet port 4c.
  • a first fuel duct 6 connects the first outlet port 4b of the selector valve 4 to the first fuel injection valve 1, and a second fuel duct 7 connects the second outlet port 4c to the second fuel injection valve 2.
  • the inlet port 4a of the selector valve 4 is connected to the fuel supply duct 5.
  • the selector valve 4 is a solenoid valve.
  • the selector valve 4 When the engine is operated on liquid fuel, the selector valve 4 is in a position allowing flow from the fuel injection pump 3 to the first fuel injection valve 1 and preventing flow to the second fuel injection valve 2. The timing of the fuel injection and the quantity of the injected fuel is adjusted by the fuel injection pump 3 in a conventional manner.
  • the valve needle 1 b When the pressure in the fuel gallery 1d of the first fuel injection valve 1 is high enough, the valve needle 1 b is pushed against the spring 1 c, and the first fuel injection valve 1 is opened. Fuel is thus injected through the nozzle 1 a of the first fuel injection valve 1 into the combustion chamber of the cylinder 11.
  • the spring 1 c pushes the valve needle 1 b of the first fuel injection valve 1 into a closed position when the pressure in the fuel gallery 1 d drops enough and the fuel injection is consequently terminated.
  • the selector valve 4 When the engine is operated in a gas mode, the selector valve 4 is switched into a position, in which flow from the fuel injection pump 3 to the second fuel injection valve 2 is allowed and flow from the fuel injection pump 3 to the first fuel injection valve 1 is prevented. In the gas mode, only a small amount of liquid fuel is used. The whole amount supplied by the fuel injection pump 3 is thus not needed. Therefore, the arrangement is provided with means 9 for controlling the opening of the second fuel injection valve 2. In the embodiment of the figure, the arrangement is provided with a control valve 9, which is used for actuating the second fuel injection valve 2. With the control valve 9, opening of the second fuel injection valve 2 can be prevented even in the case the pressure in the fuel gallery 2d would be high enough for moving the valve needle 2b against the spring 2c.
  • the opening and closing moments of the second fuel injection valve 2 are thus determined by the control valve 9, which enables accurate timing.
  • the control valve 9 is electrically operated. Also other kinds of actuators could be used for controlling the opening and/or closing timing of the second fuel injection valve 2.
  • the arrangement is further provided with an overflow duct 10, through which the excess fuel can be returned into a tank 12.
  • the overflow duct 10 is connected to the second fuel duct 7, i.e. between the selector valve 4 and the second fuel injection valve 2.
  • the injection pressure needed in the second fuel injection valve 2 is lower than the maximum pressure of the fuel injection pump 3. Therefore, the overflow duct 10 is provided with means 8 for regulating the pressure in the second fuel duct 7.
  • the means are an adjustable throttle 8.
  • the overflow duct 10 could be provided with a pressure reducing valve. With the pressure regulating means, the injection pressure of the second fuel injection valve 2 can be adjusted to an appropriate level irrespective of the pressure of the fuel injection pump 3.

Claims (8)

  1. Kraftstoff-Einspritzungsanordnung zum Einspritzen von Kraftstoff in einen Zylinder (11) einer Kolbenkraftmaschine, wobei die Anordnung ein erstes Kraftstoff-Einspritzventil (1), ein zweites Kraftstoff-Einspritzventil (2), eine Druckmedienquelle (3) zum Zuführen von Kraftstoff zu dem ersten Kraftstoff-Einspritzventil (1) und zu dem zweiten Kraftstoff-Einspritzventil (2), ein Wahlventil (4) zum selektiven Ermöglichen eines Stroms von der Druckmedienquelle (3) zu dem ersten Kraftstoff-Einspritzventil (1) oder zu dem zweiten Kraftstoff-Einspritzventil (2), eine Kraftstoff-Zufuhrleitung (5) zum Verbinden der Druckmedienquelle (3) mit dem Wahlventil (4), eine erste Kraftstoffleitung (6) zum Verbinden des ersten Kraftstoff-Einspritzventils (1) mit dem Wahlventil (4), eine zweite Kraftstoffleitung (7) zum Verbinden des zweiten Kraftstoff-Einspritzventils (2) mit dem Wahlventil (4), und Mittel (8) zum Regulieren des Drucks in der zweiten Kraftstoffleitung (7) zwischen dem Wahlventil (4) und dem zweiten Kraftstoff-Einspritzventil (2) umfasst, dadurch gekennzeichnet, dass die Anordnung eine Überlaufleitung (10) umfasst, die von der zweiten Kraftstoffleitung (7) abzweigt, und die Überlaufleitung (10) mit Mitteln (8) zum Regulieren des Drucks in der zweiten Kraftstoffleitung (7) versehen ist.
  2. Kraftstoff-Einspritzungsanordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Druckmedienquelle (3) eine Hochdruck-Kraftstoffeinspritzpumpe ist.
  3. Kraftstoff-Einspritzungsanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das zweite Kraftstoff-Einspritzventil (2) zum Einspritzen kleinerer Kraftstoffmengen als das erste Kraftstoff-Einspritzventil (1) konfiguriert ist.
  4. Kraftstoff-Einspritzungsanordnung nach Anspruch 3, dadurch gekennzeichnet, dass das zweite Kraftstoff-Einspritzventil (2) ein Zündkraftstoffventil ist.
  5. Kraftstoff-Einspritzungsanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Anordnung Mittel (9) zum Steuern der Öffnungs- und/oder Schließzeiten des zweiten Kraftstoff-Einspritzventils (2) umfasst.
  6. Kraftstoff-Einspritzungsanordnung nach Anspruch 5, dadurch gekennzeichnet, dass die Anordnung ein Steuerventil (9) zum Steuern der Öffnungs- und/oder Schließzeiten des zweiten Kraftstoff-Einspritzventils (2) umfasst.
  7. Kraftstoff-Einspritzungsanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Mittel (8) zum Regulieren des Drucks in der zweiten Kraftstoffleitung (7) eine Drossel ist.
  8. Kraftstoff-Einspritzungsanordnung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Mittel (8) zum Regulieren des Drucks in der zweiten Kraftstoffleitung (7) ein Druckminderungsventil ist.
EP13792715.8A 2012-10-18 2013-10-14 Kraftstoffeinspritzungsanordnung Active EP2917554B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20126081A FI124743B (fi) 2012-10-18 2012-10-18 Polttoaineen ruiskutusjärjestely
PCT/FI2013/050983 WO2014060646A1 (en) 2012-10-18 2013-10-14 Fuel injection arrangement

Publications (2)

Publication Number Publication Date
EP2917554A1 EP2917554A1 (de) 2015-09-16
EP2917554B1 true EP2917554B1 (de) 2017-02-08

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EP13792715.8A Active EP2917554B1 (de) 2012-10-18 2013-10-14 Kraftstoffeinspritzungsanordnung

Country Status (5)

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EP (1) EP2917554B1 (de)
KR (1) KR102034334B1 (de)
CN (1) CN104755742B (de)
FI (1) FI124743B (de)
WO (1) WO2014060646A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3021498C (en) 2016-04-19 2019-12-17 Nissan Motor Co., Ltd. High activity alloy-based electrode catalyst, and membrane electrode assembly and fuel cell using high activity alloy-based electrode catalyst

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH623114A5 (de) * 1977-09-01 1981-05-15 Sulzer Ag
DE10040738B4 (de) * 1999-08-19 2012-12-13 Avl List Gmbh Einspritzeinrichtung für eine Brennkraftmaschine mit einer als Doppelnadeldüse ausgeführten Einspritzdüse
DE10160258A1 (de) * 2001-12-07 2003-06-18 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
JP2006017059A (ja) * 2004-07-02 2006-01-19 Toyota Motor Corp エンジンの燃料供給装置
FI123513B (fi) * 2010-12-02 2013-06-14 Waertsilae Finland Oy Polttoaineen syöttöyksikkö, menetelmä sen käyttämiseksi ja polttomoottori
FI123474B (en) * 2012-01-19 2013-05-31 Waertsilae Finland Oy Fuel injection system

Also Published As

Publication number Publication date
EP2917554A1 (de) 2015-09-16
WO2014060646A1 (en) 2014-04-24
KR102034334B1 (ko) 2019-10-18
FI20126081A (fi) 2014-04-19
KR20150070212A (ko) 2015-06-24
FI124743B (fi) 2015-01-15
CN104755742A (zh) 2015-07-01
CN104755742B (zh) 2017-04-19

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