EP2044316A1 - Verfahren zum einspritzen von brennstoff mittels eines brennstoffeinspritzsystems - Google Patents
Verfahren zum einspritzen von brennstoff mittels eines brennstoffeinspritzsystemsInfo
- Publication number
- EP2044316A1 EP2044316A1 EP06777813A EP06777813A EP2044316A1 EP 2044316 A1 EP2044316 A1 EP 2044316A1 EP 06777813 A EP06777813 A EP 06777813A EP 06777813 A EP06777813 A EP 06777813A EP 2044316 A1 EP2044316 A1 EP 2044316A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel injection
- valve
- injection valve
- holding current
- time
- 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.)
- Withdrawn
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 98
- 238000002347 injection Methods 0.000 title claims abstract description 85
- 239000007924 injection Substances 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims description 38
- 238000007789 sealing Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 208000031872 Body Remains Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000003466 welding Methods 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
-
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
-
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
- F02M51/0617—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature having two or more electromagnets
Definitions
- the invention relates to a method for injecting fuel by means of a fuel injection system according to the preamble of claim 1 and according to the preamble of claim 12 with respect to a fuel injection system according to the invention.
- a fuel injection valve which has a core, a magnetic coil and an acted upon by the solenoid in a stroke direction against a return spring armature and a valve needle.
- the valve needle is fixedly connected to both the armature and a valve closing body which cooperates with a tight sealing seat and forms a movable valve member.
- an auxiliary body is arranged between the armature and the valve closing body, which is movable relative to the valve needle.
- the valve needle is designed in such a way with a driving means, that with a movement of the auxiliary body in the stroke direction, the valve needle can be accelerated in the same direction and a quick opening of the fuel injection valve is made possible.
- a disadvantage of the fuel injection valve known from the above-mentioned document is in particular that although the ⁇ fmungsmos of the fuel injection valve can be done quickly, but the closing movement is linearly delayed with time. This adversely affects the throttle phase of the fuel injection valve and causes poor mixture preparation due to a fuel jet having the shape of a cone, wherein the cone angle is small.
- a large cone angle of the exiting fuel jet is desirable, so that the divergence of the exiting fuel jet
- Fuel jet can fill the combustion chamber well with a fuel-air mixture, which in turn ensures a uniform and complete combustion of the fuel-air mixture in the combustion chamber of an internal combustion engine.
- the inventive method for injecting fuel or a fuel injection system with a fuel injection valve and a control unit having the characterizing features of claim 1 or of claim 12, has the advantage that the valve needle is briefly stopped during the closing operation, so that the Gap, which has formed because of the stroke of the valve needle between the valve seat and valve closing body remains constant for a certain period.
- This throttling of the fuel injection valve which corresponds to an extension of the closing operation, has an advantageous effect on the jet angle close to the jet at the nozzle exit, i. the nozzle-near beam angle is increased by the method according to the invention. This results in a better atomization of the expanded fuel jet and thus improved air detection, whereby the ignitability of the formed fuel-air mixture is increased.
- Another advantage of the invention is an expansion of the spatial and temporal tolerance of the assignment of the beam and the spark. That means the actual
- Ignition timing of the optimal, calculated or determined in a simulation ignition timing may be premature as well as delayed by a small tolerance time.
- An expansion of spatial tolerance means that even a more dilute fuel-air mixture in the
- Combustion chamber can be optimally ignited.
- the injected fuel is throttled in the valve seat of the nozzle.
- This effect is adjustable in response to a stroke of the valve needle and therefore adaptable to various embodiments of fuel injectors. It is also advantageous that the throttling of the fuel injection valve can be switched on and off again by means of a control device provided for this purpose.
- a double coil can be used, which can optionally be switched on or off for faster opening and closing of the fuel injection valve.
- Fig. 2 is a current-time diagram of the current, as according to the invention
- FIG. 3 shows a stroke-time diagram of the valve needle according to the method according to the invention
- FIG. 5 shows an inventive fuel injection system consisting of a
- Fuel injection valve and a control unit for the targeted injection of fuel are provided.
- Fig. 7 shows a detail VII of the fuel injection valve according to the invention in Fig. 1, the difference between a single cone angle and a
- a control unit 9 which is part of a fuel injection system 1 according to the invention, determines in a first method step that for the opening phase 10 and the closing phase 11 of the fuel injection valve 1 in total one
- Time span t ges 15 is provided. Within this time span t ges 15, which results from summation of a time period t a 16 and a time period t s 17, an opening phase 10 for the fuel injection valve 2 which corresponds to the time period t a 16 and to an ordinate of the state-time Diagram applied state "1" corresponds and a closing phase 11, which corresponds to the time period t s 17 and the plotted on an abscissa of the state-time diagram state "0" determined.
- the inventive method for targeted injection of fuel by means of a fuel injection system 1 comprises, as shown in Fig. 5, a fuel injection valve 2 with a magnetic coil 3, which cooperates with an acted upon by a return spring 4 anchor 5, which together with a valve needle 6 an axially movable Valve part forms and a control unit 9 for driving the fuel injection valve 2.
- a valve closing body 7 is provided, which forms a sealing seat with a valve seat body 8.
- control unit 9 is in a first process step for the fuel injection valve 2, an opening phase 10 with a first holding current 12 and in a second process step after the opening phase 10 beginning closing phase 11 with a second holding current 13 before.
- the second method step is a targeted extension of a throttle phase of the fuel injection valve 2 during the period of time determined by the time t a 16 and a switch-off time t c 21.
- a widening of the injected fuel jet 25 takes place, ie a single jet cone angle 39 of the conical single fuel jet 25 is increased, the total cone angle 40 remains almost constant. This is shown in FIG.
- the current flow in the solenoid 3 during the closing phase 11 of the fuel injector 2 is set so that the magnetic field generated by the second holding current 13 causes a certain magnetic force, so that the valve needle 6 experiences a defined non-zero stroke 14 and this constant over a defined period of time, which is shorter than the closing phase 11 remains constant.
- the stroke 14 caused by the second holding current 13 is smaller than the stroke 14 caused by the first holding current 12.
- Fig. 2 shows a current-time diagram of the current, as it is impressed according to the method according to the invention by means of the control unit 9 of the magnetic coil 3.
- a bias current 1 ⁇ n 19 for biasing.
- the current in the magnetic coil 3 increases to the time t m 20 to the value I 103x 44, after in the solenoid coil 3, the bias current 1 ⁇ n 19 has flowed.
- Fig. 2 shows the drop in the current flowing in the magnetic coil 3 of I 103x 44 to the time until the end of the opening phase 10 constant first holding current 13. The duration of the first holding current 12 in the
- ⁇ ffhungsphase 10 is also defined by the control unit 9.
- the control unit 9 determines a lower current intensity of the second holding current 13 than that of the first holding current 12 and a switch-off time t c 21 within the closing phase 11 of the fuel injection valve 2.
- Fig. 3 shows a stroke-time diagram of the method according to the invention, wherein in a third step within the time t b 18, a stroke 14 of the valve needle 6 is set to zero.
- a stroke 14 of the valve needle 6 At a time t ⁇ j 22, which is later than t ⁇ 20, the stroke 14 of the valve needle 6 has risen to a time constant to the end of the opening phase 10 maximum stroke 23.
- the stroke 14 of the valve needle 6 has dropped to less than half of this maximum lift 23 and remains until the switch-off time t c 21 in the closing phase 11 constant over time.
- different slopes having variants of a closing operation 41, 42 and 43 for the fuel injection valve 2 are applicable.
- Opening phase 10 and in the closing phase 11 emits an injection amount of fuel that increases linearly with time until the turn-off time t c 21 and after the turn-off time t c 21 until the end of the closing phase 11 is constant in time zero, with small injection quantities, in particular during the opening and closing of the fuel injection valve 2, the injection quantity as a function of the injection time may deviate from the linear relationship, this non-linear deviation being corrected in the control unit 9 by corresponding characteristic curves.
- FIG. 5 shows a fuel injection system 1 according to the invention with a fuel injection valve 2 and a control unit 9 for the targeted injection of fuel.
- the fuel injection valve 2 comprises a magnetic coil 3 which is wound on a coil carrier 26.
- the bobbin 26 is encapsulated in a valve housing 27.
- the bobbin 26 is penetrated by serving as an inner pole core 29, which is designed tubular.
- the valve housing 27 can serve. Downstream of the inner pole 29, an armature 5 is arranged, the z. B. is integrally formed on a valve needle 6.
- valve needle 6 is preferably by welding in operative connection with a in
- Embodiment conical valve closing body 7 which forms a sealing seat with a valve seat surface 32 of a valve seat body 8. Upstream of the sealing seat, a swirl disk 33 is provided. In the valve seat body 8, at least one injection opening 34 is formed, from which the fuel is injected into the combustion chamber, not shown.
- the armature 5 is acted upon in the idle state of the fuel injection valve 1 by a return spring 4, that the fuel injection valve 2 by the pressure of the valve closing body. 7 is kept closed on the valve seat body 8.
- the return spring 4 is arranged in a recess of the inner pole 29 and is brought via a flange and by an adjusting sleeve 38 to bias.
- the fuel which is supplied via a central fuel supply 35, flows through the fuel injection valve 2 through the recess of the inner pole 29 and reaches the sealing seat and the injection opening 34.
- the fuel injection valve 2 is closed as soon as the magnetic coil 3 exciting current is turned off and the magnetic field is reduced so far that the return spring 4 pushes the armature 5 from the inner pole 29, whereby the valve needle 6 moves in the outflow direction and the valve closing body 7 touches on the valve seat body 8 ,
- Control unit 9 and fuel injection valve 2 form the fuel injection system 1 according to the invention for injecting fuel into a combustion chamber, not shown, of an internal combustion engine, wherein the fuel injection valve 2 undergoes a throttling during the closing phase 11.
- Fig. 6 shows a possible injection hole geometry, which has a great influence on the expression of the jet-widening effect, wherein a large ratio of the step diameter D to the spray hole diameter d is advantageous and the spray hole can be tapered.
- Fig. 7 the detail VII of Fig. 1 is shown enlarged. This clarifies the difference between the single cone angle and the total cone angle.
- the invention is not limited to the illustrated embodiment. In particular, any combinations of the various features are possible.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2006/064340 WO2008009313A1 (de) | 2006-07-17 | 2006-07-17 | Verfahren zum einspritzen von brennstoff mittels eines brennstoffeinspritzsystems |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2044316A1 true EP2044316A1 (de) | 2009-04-08 |
Family
ID=37950626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06777813A Withdrawn EP2044316A1 (de) | 2006-07-17 | 2006-07-17 | Verfahren zum einspritzen von brennstoff mittels eines brennstoffeinspritzsystems |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100154750A1 (de) |
EP (1) | EP2044316A1 (de) |
JP (1) | JP2009543969A (de) |
CN (1) | CN101484678A (de) |
WO (1) | WO2008009313A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5053868B2 (ja) | 2008-01-07 | 2012-10-24 | 日立オートモティブシステムズ株式会社 | 燃料噴射制御装置 |
US8468810B2 (en) * | 2009-12-04 | 2013-06-25 | Tenneco Automotive Operating Company Inc. | NOx elimination injector firing control circuit |
US9638135B2 (en) * | 2013-07-31 | 2017-05-02 | Walbro Llc | Fuel shut-off solenoid system |
DE102014225394A1 (de) * | 2014-12-10 | 2016-06-16 | Continental Automotive Gmbh | Düsenkörper und Fluid-Einspritzventil |
CN109642533B (zh) * | 2016-08-26 | 2021-03-02 | 日立汽车系统株式会社 | 燃料喷射装置的控制装置 |
DE102016219888B3 (de) * | 2016-10-12 | 2017-11-23 | Continental Automotive Gmbh | Betreiben eines Kraftstoffinjektors mit hydraulischem Anschlag |
CN111779586A (zh) * | 2020-06-30 | 2020-10-16 | 上海交通大学 | 一种全参数可调的直喷喷油器驱动器 |
DE102021200876A1 (de) * | 2021-02-01 | 2022-08-04 | Robert Bosch Gesellschaft mit beschränkter Haftung | Verfahren zum Betreiben eines Magnetventils |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4219154A (en) * | 1978-07-10 | 1980-08-26 | The Bendix Corporation | Electronically controlled, solenoid operated fuel injection system |
US4922878A (en) * | 1988-09-15 | 1990-05-08 | Caterpillar Inc. | Method and apparatus for controlling a solenoid operated fuel injector |
DE19855547A1 (de) * | 1998-12-02 | 2000-06-08 | Bosch Gmbh Robert | Elektromagnetisch betätigbares Ventil |
JP4110751B2 (ja) * | 2001-06-18 | 2008-07-02 | 株式会社日立製作所 | インジェクタ駆動制御装置 |
JP2003083202A (ja) * | 2001-09-10 | 2003-03-19 | Nippon Soken Inc | 燃料噴射弁 |
JP2004092573A (ja) * | 2002-09-03 | 2004-03-25 | Hitachi Ltd | 燃料噴射装置および制御方法 |
-
2006
- 2006-07-17 US US11/988,070 patent/US20100154750A1/en not_active Abandoned
- 2006-07-17 JP JP2009519801A patent/JP2009543969A/ja active Pending
- 2006-07-17 CN CNA2006800553662A patent/CN101484678A/zh active Pending
- 2006-07-17 EP EP06777813A patent/EP2044316A1/de not_active Withdrawn
- 2006-07-17 WO PCT/EP2006/064340 patent/WO2008009313A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2008009313A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20100154750A1 (en) | 2010-06-24 |
JP2009543969A (ja) | 2009-12-10 |
CN101484678A (zh) | 2009-07-15 |
WO2008009313A1 (de) | 2008-01-24 |
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Legal Events
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Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
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GRAP | Despatch of communication of intention to grant a patent |
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RIC1 | Information provided on ipc code assigned before grant |
Ipc: F02M 61/18 20060101ALI20110906BHEP Ipc: F02M 45/12 20060101ALI20110906BHEP Ipc: F02M 51/06 20060101ALI20110906BHEP Ipc: F02D 41/20 20060101AFI20110906BHEP |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20120201 |