EP0975865A1 - Kraftstoffinjektor für eine brennkraftmaschine für kraftstoff-/emulsionsbetrieb - Google Patents
Kraftstoffinjektor für eine brennkraftmaschine für kraftstoff-/emulsionsbetriebInfo
- Publication number
- EP0975865A1 EP0975865A1 EP98920523A EP98920523A EP0975865A1 EP 0975865 A1 EP0975865 A1 EP 0975865A1 EP 98920523 A EP98920523 A EP 98920523A EP 98920523 A EP98920523 A EP 98920523A EP 0975865 A1 EP0975865 A1 EP 0975865A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- channel
- additional liquid
- supply channel
- injector
- 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
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 226
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 36
- 239000000839 emulsion Substances 0.000 title claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 238000002347 injection Methods 0.000 claims abstract description 31
- 239000007924 injection Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 4
- 239000002283 diesel fuel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
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
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
- F02M43/04—Injectors peculiar thereto
Definitions
- the invention relates to a fuel injector for an internal combustion engine for fuel / emulsion operation according to the preamble of claim 1.
- a fuel / emulsion operation is increasingly being used, in which, depending on the operating and load condition of the internal combustion engine, either pure fuel or an emulsion formed from fuel and an emulsifiable additional liquid is burned.
- water is used in particular as the additional liquid.
- the emulsion is preferably produced by intensively mixing fuel and additional fluid in the fuel injector of the internal combustion engine.
- a disadvantage of emulsion operation is that water from the emulsion remains in the feed line and inside the fuel injector during breaks in operation and leads to undesirable corrosion there.
- a fuel injector for an internal combustion engine for a fuel / emulsion operation in which the fuel and the additional liquid used to form the emulsion are fed through respective feed channels in parallel to a mixing chamber provided in the fuel injector and there under Utilization of the kinetic flow energy of the supplied liquid flows are intimately mixed with one another.
- measures to prevent water contained in the emulsion from remaining idle during operational breaks and thus possible corrosion are not yet provided here.
- the object of the invention is to provide a fuel injector for an internal combustion engine for fuel / emulsion operation, in which corrosion caused by water used to produce the emulsion is prevented.
- the invention provides a fuel injector for an internal combustion engine for fuel / emulsion operation, which has an injection nozzle formed by a nozzle needle and a nozzle needle cone for injecting fuel into the combustion chamber of the internal combustion engine in response to actuation of the nozzle needle.
- the fuel injector also has a nozzle space surrounding the nozzle needle and one connected to the nozzle space
- Mixing chamber formed fuel volume, as well as a first fuel supply channel opening into the mixing chamber for supplying fuel under high pressure, supplied by a high-pressure line into the fuel volume and a second fuel supply channel also opening into the mixing chamber for parallel supply of an emulsion which forms an emulsion under high pressure with the fuel Additional liquid, in particular water, into the fuel volume, and also an additional liquid supply channel which serves to supply the additional liquid to the second fuel supply channel during the breaks in injection.
- a switching valve device is used to control the quantities of liquid to be supplied to the first and second fuel supply channels.
- the fuel supply channel can be optionally connected to the high-pressure line supplying the fuel by means of the switching valve device for supplying fuel, and that the additional liquid supply channel serving to supply the additional liquid to the second fuel supply channel opens into the second fuel supply channel downstream of the switching valve device in such a way that during an injection pause the additional liquid supply channel opens into the second fuel supply channel the quantity V of the additional liquid supplied to the second fuel inlet channel during a subsequent injection phase from that via the The switching valve device required, fuel under high pressure is completely injected into the combustion chamber of the internal combustion engine.
- the advantage of the fuel injector according to the invention is that the second fuel inlet channel and the fuel volume of the injector are completely flushed with fuel supplied via the second fuel inlet channel and thus no residues of water-based emulsion remain in the fuel injector during breaks in operation, which could cause corrosion.
- the first fuel inlet channel or the second fuel inlet channel can be connected via the switching valve device to a fuel return line, via which fuel displaced from the second liquid inlet channel flows out when the additional liquid is supplied from the additional liquid supply channel.
- a throttle device which limits the flow of fuel is provided in the second fuel supply channel downstream of the switching valve device.
- a throttle device has the advantage that the amount of fuel flowing in via the second fuel supply channel can be controlled in a simple manner.
- Such a throttle device can advantageously be formed by a check valve opening in the direction of the injection flow.
- a throttle device which limits the flow of fuel is also provided in the first fuel feed channel downstream of the switching valve device.
- throttle devices are provided in both the first and the second fuel inlet channel, which are dimensioned such that the amount of fuel flowing through the second fuel inlet channel is sufficient to completely supply the amount V of additional liquid present in the second fuel channel To spend mixing chamber, and that the amount of fuel flowing through both fuel channels is sufficient to completely displace the amount of fuel present in the fuel volume of the injector from the injector.
- both throttle devices can be designed to be controllable.
- the mixing chamber is designed as an annular space surrounding the nozzle needle, that the two fuel supply channels open into the mixing chamber on opposite sides, and that the additional liquid supply channel opens into the second fuel supply channel near the mixing chamber. It is thereby achieved that water stored during the injection break is conveyed into the mixing chamber at the beginning of the injection phase regardless of the amount of water and forms an emulsion together with the fuel introduced through the first fuel inlet channel.
- the two fuel inlet channels in the fuel injector advantageously run essentially parallel to the longitudinal axis of the injector on opposite sides of the nozzle needle.
- the first fuel inlet channel can be connected to a fuel return line via the switching valve device.
- the second fuel inlet channel branches off downstream of the switching device and upstream of the throttle device provided in the first fuel inlet channel from the first fuel inlet channel, as a result of which the fuel flow supplied to the first fuel inlet channel by the high-pressure injection line is divided between the first and second fuel inlet channels.
- the additional liquid supply channel opens downstream of the throttle device provided in the second fuel feed channel, which in this exemplary embodiment can be designed either as a controllable throttle device or as a check valve opening in the injection direction with a corresponding throttle effect.
- the switching valve device is designed as a 3/2-way valve which blocks the first fuel inlet channel during the injection breaks and connects the second fuel inlet channel to the return line and which connects both fuel inlet channels with the fuel during the injection phase supplying high pressure line connects.
- the figure shows a schematic cross-sectional view of a fuel injector for an internal combustion engine for fuel / emulsion operation according to an embodiment of the invention.
- the figure shows a fuel injector 1, which is used to supply fuel / emulsion to the combustion chamber of an internal combustion engine.
- the fuel or the emulsion is, in particular, diesel fuel and an emulsion formed from diesel fuel and water.
- the fuel injector 1 contains a nozzle needle 2, which together with a nozzle needle cone 3, which serves as a valve seat for the nozzle needle 2, forms an injection nozzle 15.
- the nozzle needle 2 is by means of a control mechanism known as such and not specifically shown in the figure in the sense of opening and closing
- the nozzle needle 2 is surrounded in the lower part of the fuel injector 1 by a fuel volume which is formed by an annular nozzle chamber 4 surrounding the nozzle needle 2 and an annular mixing chamber 5 also surrounding the nozzle needle 2.
- the first fuel inlet channel 10 is coupled to a connection C of the multi-way valve 6 and optionally via a connection A thereof to a high-pressure line 7, which supplies fuel under high pressure, for example from a common rail rail or can be connected to a connection B thereof.
- the connection B is connected to a return line 8, which discharges excess fuel from the fuel injector 1.
- the second fuel inlet channel 11 branches off from the first fuel inlet 10 downstream of the multi-way valve 6.
- a throttle device 12 is connected downstream of the branching point 16 in the first fuel inlet channel 10, and a check valve 13 is connected in the second fuel inlet channel 11.
- An additional liquid supply channel 9 is connected to the second fuel supply channel 11 immediately downstream of the check valve 13.
- the additional liquid supply channel 9 is used to supply the additional liquid, in particular water, which is used to produce the fuel / water emulsion in the mixing chamber 5.
- the mouth of the additional liquid supply channel 9 in the second fuel supply channel 11 is so far downstream of the multi-way valve 6 that the maximum amount V of additional liquid required for producing the emulsion required for an injection process is completely absorbed in the second fuel supply channel 11, as in the drawing with the double arrow 17 is shown.
- a leakage oil line 14 is used to discharge leakage and control quantities occurring at the injector.
- the multi-way valve 6 is switched to the position I shown in the figure. In this position I, the inflow of fuel from the high-pressure line 7 to the first fuel inlet channel 10 is interrupted. The first fuel inlet channel 10 is through
- Multi-way valve 6 switched from the switching position I into the switching position II, the connection between the connections B and C of the multi-way valve 6 being interrupted and at the same time the connections A and C are connected to one another and thus the inflow of fuel from the high-pressure line 7 into the first fuel inlet channel
- the second fuel inlet channel 11 is also connected to the high-pressure line 7 via the branching point 16, so that fuel under high pressure from the high-pressure line 7 also into the second fuel inlet channel
- the flow conditions in the fuel injector 1 are set so that the amount V of the additional liquid is completely displaced into the mixing chamber 5 by the fuel that is requested via the switching valve device 6 into the second fuel inlet channel 11.
- the amount of fuel flowing in through both fuel inlet channels 10, 11 is dimensioned such that it is sufficient to inject the emulsion formed completely into the combustion chamber of the internal combustion engine, so that the fuel inlet channels and the fuel volume 4, 5 of the fuel injector are flushed completely with the inflowing fuel, so that no water remains from the emulsion in the fuel injector, which could cause corrosion.
- the throttle devices 12, 13 are dimensioned and matched to one another such that the amount of fuel flowing through the second fuel supply channel 11 is sufficient at the beginning of the injection phase to completely shift the additional liquid amount V stored in the second fuel supply channel 11 into the mixing chamber 5, from where it is there
- the emulsion formed is completely injected into the combustion chamber of the internal combustion engine from the fuel volume 4, 5 of the injector 1 via the fuel demanded via both fuel supply channels 10, 11.
- the throttle device 13 arranged in the second fuel inlet channel 11 can be formed by a check valve opening in the direction of the injection flow.
- the multi-way valve 6 is switched back to the position shown in the figure. After the injection process, the entire interior of the fuel injector 1 is completely flushed with fuel, so that, in the event of a break in operation of the internal combustion engine, no corrosion can occur due to water present in the interior of the fuel injector 1 from the emulsion.
- Switching valve device multi-way valve
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
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19715785 | 1997-04-16 | ||
DE19715785A DE19715785C2 (de) | 1997-04-16 | 1997-04-16 | Kraftstoffinjektor für eine Brennkraftmaschine für Kraftstoff/Emulsionsbetrieb |
PCT/EP1998/002192 WO1998046875A1 (de) | 1997-04-16 | 1998-04-11 | Kraftstoffinjektor für eine brennkraftmaschine für kraftstoff/emulsionsbetrieb |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0975865A1 true EP0975865A1 (de) | 2000-02-02 |
EP0975865B1 EP0975865B1 (de) | 2002-03-13 |
Family
ID=7826623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98920523A Expired - Lifetime EP0975865B1 (de) | 1997-04-16 | 1998-04-11 | Kraftstoffinjektor für eine brennkraftmaschine für kraftstoff-/emulsionsbetrieb |
Country Status (5)
Country | Link |
---|---|
US (1) | US6223699B1 (de) |
EP (1) | EP0975865B1 (de) |
AT (1) | ATE214461T1 (de) |
DE (2) | DE19715785C2 (de) |
WO (1) | WO1998046875A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19939426A1 (de) * | 1999-08-20 | 2001-03-01 | Bosch Gmbh Robert | Kraftstoffeinspritzsystem für eine Brennkraftmaschine |
CA2633846C (en) * | 2008-06-27 | 2009-12-29 | Westport Power Inc. | Fuel injection valve and method for co-injecting a liquid and a gaseous fuel into the combustion chamber of an internal combustion engine |
DE102015203607B4 (de) * | 2015-02-27 | 2019-12-19 | Mtu Friedrichshafen Gmbh | Brennkraftmaschine sowie Verfahren zum Betreiben einer Brennkraftmaschine |
DE102016000761A1 (de) * | 2016-01-27 | 2017-07-27 | Roman TANIEL | Emulgiersystem und Emulgierverfahren |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1202610B (it) * | 1987-03-03 | 1989-02-09 | Parmenide Srl | Dispositivo per l'iniezione in motori a combustione interna di emulsioni combustibili a rapporto prontamente variabile |
US5170751A (en) * | 1990-05-23 | 1992-12-15 | Mitsubishi Jukogyo Kabushiki Kaisha | Water-injection diesel engine |
US5174247A (en) * | 1992-01-22 | 1992-12-29 | Mitsubishi Jukogyo Kabushiki Kaisha | Water injection diesel engine |
JP3241133B2 (ja) * | 1992-12-25 | 2001-12-25 | 三菱重工業株式会社 | 二種流体噴射装置 |
DE4337048C2 (de) * | 1993-10-29 | 1996-01-11 | Daimler Benz Ag | Kraftstoffeinspritzanlage für eine Brennkraftmaschine |
DE4435823C1 (de) * | 1994-10-07 | 1995-12-14 | Mtu Friedrichshafen Gmbh | Bifluide Einspritzdüse |
DE4445980C2 (de) * | 1994-12-22 | 1999-12-30 | Mtu Friedrichshafen Gmbh | Einspritzsystem |
EP0760425B1 (de) * | 1995-08-30 | 2000-11-15 | Robert Bosch Gmbh | Einspritzeinrichtung |
DE19535703C2 (de) * | 1995-09-26 | 1997-07-31 | Mtu Friedrichshafen Gmbh | Brennstoffeinspritzsystem |
-
1997
- 1997-04-16 DE DE19715785A patent/DE19715785C2/de not_active Expired - Fee Related
-
1998
- 1998-04-11 AT AT98920523T patent/ATE214461T1/de not_active IP Right Cessation
- 1998-04-11 DE DE59803339T patent/DE59803339D1/de not_active Expired - Fee Related
- 1998-04-11 WO PCT/EP1998/002192 patent/WO1998046875A1/de active IP Right Grant
- 1998-04-11 US US09/403,141 patent/US6223699B1/en not_active Expired - Fee Related
- 1998-04-11 EP EP98920523A patent/EP0975865B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9846875A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0975865B1 (de) | 2002-03-13 |
US6223699B1 (en) | 2001-05-01 |
DE59803339D1 (de) | 2002-04-18 |
DE19715785A1 (de) | 1998-10-29 |
WO1998046875A1 (de) | 1998-10-22 |
DE19715785C2 (de) | 1999-12-09 |
ATE214461T1 (de) | 2002-03-15 |
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