EP1346148A1 - Fuel injection valve - Google Patents
Fuel injection valveInfo
- Publication number
- EP1346148A1 EP1346148A1 EP01989418A EP01989418A EP1346148A1 EP 1346148 A1 EP1346148 A1 EP 1346148A1 EP 01989418 A EP01989418 A EP 01989418A EP 01989418 A EP01989418 A EP 01989418A EP 1346148 A1 EP1346148 A1 EP 1346148A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- injection valve
- fuel injection
- swirl
- valve according
- 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- Withdrawn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
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
- 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
-
- 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
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached 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
- 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
- F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
Definitions
- the invention relates to a fuel injector according to the preamble of the main claim.
- AI is a fuel injection valve for the direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignited
- Internal combustion engine which has a guide and seat area at the downstream end of the fuel injection valve, which is formed by three disc-shaped elements.
- a swirl element is embedded between a guide element and a valve seat element.
- the guide element serves to guide an axially movable valve needle projecting through it, while a valve closing section of the valve needle interacts with a valve seat surface of the valve seat element.
- the swirl element has an inner opening area with a plurality of swirl channels which are not connected to the outer circumference of the swirl element. The entire opening area extends completely over the axial thickness of the swirl element.
- a disadvantage of the fuel injector known from the abovementioned publication is in particular that Fixed swirl angle that cannot be adapted to different operating conditions such as partial and full load operation of an internal combustion engine. As a result, the cone opening angle of the injected mixture cloud cannot be adapted to the different operating states, which leads to inhomogeneities in the combustion, increased fuel consumption and increased exhaust gas emissions.
- the fuel injector according to the invention with the characterizing features of the main claim has the advantage that the swirl is adjustable depending on the operating state of the fuel injector, whereby a spray pattern adapted to the operating state of the fuel injector can be generated. This enables the mixture formation and the combustion process to be optimized.
- the influence on the jet opening angle is advantageously effected via the pressure of the fuel flowing through the fuel injection valve, which produces a variable throttle effect according to the operating state by means of an elastic metering ring and thereby enables a direct influence on the swirl intensity.
- the simple and inexpensive shape of the metering ring which is easy to manufacture from an elastic material and can be used without problems in standard fuel injection valves with conventional swirl preparation, is particularly advantageous.
- the flexibility in the choice of the swirl disk is advantageous since the spray pattern can be shaped by any shape and number of swirl channels and can nevertheless be adapted to the operating state.
- Another advantage is that the setting of the static flow through the fuel injection valve can also be carried out by the measure according to the invention, whereby scatter in the static flow can be reduced, which in turn has a positive effect on the fuel consumption and the exhaust gas values.
- Fig. 1 shows an axial section through an embodiment of an inventive
- FIG. 2 shows a schematic section through the spray-side end of the fuel injector designed according to the invention along the line II-II in FIG. 1, and
- FIG. 3 shows a schematic section in area III in FIG. 1.
- the fuel injection valve 1 is designed in the form of a fuel injection valve for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines.
- Fuel injection valve 1 is particularly suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
- the fuel injection valve 1 comprises a nozzle body 2, in which the valve needle 3 is arranged.
- the valve needle 3 is operatively connected to a valve closing body 4, which cooperates with a valve seat surface 6 arranged on a valve seat body 5 to form a sealing seat.
- the fuel injector 1 is an inwardly opening fuel injector 1 which has at least one spray opening 7.
- the nozzle body 2 is sealed by a seal 8 against the outer pole 9 of a magnetic circuit.
- a magnetic coil 10 is encapsulated in a coil housing 11 and wound on a coil support 12, which bears against an inner pole 13 of the magnetic circuit.
- the inner pole 13 and the outer pole 9 are separated from one another by a gap 26 and are supported on a connecting component 29.
- the magnet coil 10 is excited via a line 19 by an electrical current that can be supplied via an electrical plug contact 17.
- the plug contact 17 is surrounded by a plastic sheath 18, which can be molded onto the inner pole 13.
- valve needle 3 is guided in a valve needle guide 14, which is disc-shaped.
- a paired adjusting washer 15 is used for stroke adjustment.
- An armature 20 is located on the other side of the adjusting washer 15. This armature is non-positively connected via a first flange 21 to the valve needle 3, which is connected to the first flange 21 by a weld seam 22.
- a return spring 23 is supported, which in the present design of the Fuel injector 1 is biased by a sleeve 24.
- a guide disk 34 On the inlet side of the sealing seat, a guide disk 34 is formed, which ensures a central alignment of the valve needle 3 and thus counteracts tilting of the valve needle 3 and subsequent inaccuracies in the metered amount of fuel.
- a swirl disk 35 is arranged between the guide disk 34 and the valve seat body 5 and has swirl channels 36.
- a measuring ring 37 is provided between the guide disk 34 and the swirl disk 35, on the one hand, and the nozzle body 2, on the other hand, which a measuring ring 37 is provided, which is preferably made of an elastic material and which is deformable under the influence of the system pressure prevailing in the fuel injector 1. A detailed description of the metering ring can be found in FIGS. 2 and 3.
- Fuel channels 30a and 30b run in the valve needle guide 14 and in the armature 20.
- the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25.
- the fuel injector 1 is sealed by a seal 28 against a fuel line, not shown.
- the armature 20 In the idle state of the fuel injection valve 1, the armature 20 is acted on by the return spring 23 against its stroke direction in such a way that the valve closing body 4 is held in sealing contact with the valve seat ⁇ .
- the magnet coil 10 When the magnet coil 10 is excited, it builds up a magnetic field which moves the armature 20 against the spring force of the return spring 23 in the stroke direction, the stroke being achieved by a position between the inner pole 12 and the Anchor 20 located working gap 27 is predetermined.
- the armature 20 also carries the flange 21, which is welded to the valve needle 3, in the lifting direction.
- the armature 20 drops from the inner pole 13 after the magnetic field has been sufficiently reduced by the pressure of the return spring 23, as a result of which the flange 21, which is operatively connected to the valve needle 3, moves counter to the stroke direction.
- the valve needle 3 is thereby moved in the same direction, as a result of which the valve-closure member 4 is seated on the valve seat surface 6 and the fuel injection valve 1 is closed.
- FIG. 2 shows an excerpt, schematic representation of a section along the line II-II through the outflow end of the fuel injector 1 shown in FIG. 1. Elements already described are provided with the same reference numerals in all the figures.
- the section shown through the valve needle 3 and the swirl disk 35 shows the metering ring 37 already mentioned above in two different operating states of the fuel injector 1.
- the swirl disk 35 is cut in one plane, the inlet side of an inlet end 38 of the metering ring 37 through the fuel injector 1 runs.
- the number of swirl channels 36 in swirl disk 35 was limited to four in order to make the schematic representation clearer. However, more or fewer swirl channels 36 are also possible.
- a swirl chamber 44 is formed, which is preferably dimensioned so that the swirl flow that remains remains homogeneous.
- the volume of the swirl chamber 44 should be large be enough to avoid undesirable throttling effects, but small enough to minimize dead volume. This is particularly important in full load operation, so that the stoichiometry of the injected mixture cloud is ensured.
- the Zumeßring ⁇ 37 is preferably made of an elastomeric material and designed in the form of a ring. It rests with an outer side 39 on an inner wall 40 of the nozzle body 2. With an outflow-side end face 41, it is supported on the valve seat body 5. A gap 42 is formed between the metering ring 37 and the swirl disk 35, the radial width of which, depending on the fuel pressure during operation of the fuel injector 1, is variable due to the elasticity of the metering ring 37.
- the pressure of the fuel flowing through the fuel injection valve 1 is dimensioned such that there is a balance of forces which acts uniformly on the metering ring 37 in the radial and axial directions.
- the gap 42 then has its smallest radial extent.
- the fuel flow is also minimal, which leads to only a slight twisting of the fuel flowing comparatively slowly through the swirl channels 36.
- a mixture cloud injected into the combustion chamber of the internal combustion engine also has only a slight widening, that is to say a small beam opening angle. This corresponds to the requirements for the mixture cloud in part-load operation.
- the metering ring 37 experiences a deformation due to a shift in the force ratio acting in the radial and axial direction, which increases the axial expansion of the metering ring 37 and the radially inward expansion decreases , Accordingly, the gap 42 between the Metering ring 37 and the swirl disk 35, so that the throttling effect of the gap 42 decreases.
- the amount of fuel flowing through the swirl channels 36 and their speed increase, which also increases the swirl. This results in an expansion of the mixture cloud injected into the combustion chamber, which thus has a larger jet opening angle and fills the combustion chamber 'homogeneously.
- the different states of the elastic metering ring 37 are each represented by a separate line.
- the line denoted by 37a denotes the basic state with a uniform loading of the metering ring 37 in the axial and radial directions, while the dashed line 37b represents the state of the maximum pressure and thus the maximum radial width of the gap 42.
- FIG. 3 shows an excerpt from a sectional illustration of a detail from the fuel injector 1 according to the invention shown in FIG. 1 in area III in FIG. 1.
- the swirl disk 35 was cut in the region of a swirl channel 36.
- the arrow indicates the direction of flow of the fuel.
- the unloaded state of the metering ring 37 is again designated 37a, the state loaded with maximum pressure is 37b.
- the invention is not restricted to the exemplary embodiments shown and can also be used in particular in the case of fuel injection valves 1 with piezoelectric or magnetostrictive actuators 10 and in any design variants of fuel injection valves 1.
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10063258 | 2000-12-19 | ||
DE10063258A DE10063258A1 (en) | 2000-12-19 | 2000-12-19 | Fuel injector |
PCT/DE2001/004750 WO2002050429A1 (en) | 2000-12-19 | 2001-12-15 | Fuel injection valve |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1346148A1 true EP1346148A1 (en) | 2003-09-24 |
Family
ID=7667763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01989418A Withdrawn EP1346148A1 (en) | 2000-12-19 | 2001-12-15 | Fuel injection valve |
Country Status (6)
Country | Link |
---|---|
US (1) | US20030168529A1 (en) |
EP (1) | EP1346148A1 (en) |
JP (1) | JP2004516411A (en) |
CZ (1) | CZ20022806A3 (en) |
DE (1) | DE10063258A1 (en) |
WO (1) | WO2002050429A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005023793B4 (en) * | 2005-05-19 | 2012-01-12 | Ulrich Schmid | Device for generating swirl in a fuel injection valve |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2941536A1 (en) * | 1979-10-13 | 1981-04-23 | Robert Bosch Gmbh, 7000 Stuttgart | Diesel engine injection nozzle - has swirl chamber with auxiliary spray hole built into needle |
GB2123481B (en) * | 1982-06-19 | 1985-04-17 | Lucas Ind Plc | C i engine fuel injection nozzles |
JPS60183268U (en) * | 1984-05-14 | 1985-12-05 | 株式会社豊田中央研究所 | Intermittent volute injection valve |
US4993643A (en) * | 1988-10-05 | 1991-02-19 | Ford Motor Company | Fuel injector with variable fuel spray shape or pattern |
JP2628742B2 (en) * | 1989-03-10 | 1997-07-09 | 株式会社日立製作所 | Electromagnetic fuel injection valve |
US5570841A (en) * | 1994-10-07 | 1996-11-05 | Siemens Automotive Corporation | Multiple disk swirl atomizer for fuel injector |
JPH09250428A (en) * | 1996-03-19 | 1997-09-22 | Toyota Motor Corp | Fuel injection valve of variable swirl flow strength type |
DE19736682A1 (en) | 1997-08-22 | 1999-02-25 | Bosch Gmbh Robert | Fuel injector for internal combustion engine |
US5996912A (en) * | 1997-12-23 | 1999-12-07 | Siemens Automotive Corporation | Flat needle for pressurized swirl fuel injector |
EP1041274B1 (en) * | 1998-10-09 | 2010-09-08 | Jun Arimoto | Fuel injection valve for diesel engine |
US6279844B1 (en) * | 1999-03-18 | 2001-08-28 | Siemens Automotive Corporation | Fuel injector having fault tolerant connection |
US6065692A (en) * | 1999-06-09 | 2000-05-23 | Siemens Automotive Corporation | Valve seat subassembly for fuel injector |
-
2000
- 2000-12-19 DE DE10063258A patent/DE10063258A1/en not_active Withdrawn
-
2001
- 2001-12-15 CZ CZ20022806A patent/CZ20022806A3/en unknown
- 2001-12-15 EP EP01989418A patent/EP1346148A1/en not_active Withdrawn
- 2001-12-15 WO PCT/DE2001/004750 patent/WO2002050429A1/en not_active Application Discontinuation
- 2001-12-15 JP JP2002551290A patent/JP2004516411A/en active Pending
- 2001-12-15 US US10/204,112 patent/US20030168529A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO0250429A1 * |
Also Published As
Publication number | Publication date |
---|---|
CZ20022806A3 (en) | 2004-04-14 |
JP2004516411A (en) | 2004-06-03 |
DE10063258A1 (en) | 2002-07-11 |
WO2002050429A1 (en) | 2002-06-27 |
US20030168529A1 (en) | 2003-09-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20030721 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HOHL, GUENTHER Inventor name: YILDIRIM, FEVZI Inventor name: KEIM, NORBERT Inventor name: HUEBEL, MICHAEL |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE FR GB IT |
|
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 |
|
18D | Application deemed to be withdrawn |
Effective date: 20050701 |