EP2643581A1 - Kraftstoffinjektor - Google Patents
KraftstoffinjektorInfo
- Publication number
- EP2643581A1 EP2643581A1 EP11788109.4A EP11788109A EP2643581A1 EP 2643581 A1 EP2643581 A1 EP 2643581A1 EP 11788109 A EP11788109 A EP 11788109A EP 2643581 A1 EP2643581 A1 EP 2643581A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve member
- injection valve
- hydraulic
- fuel injector
- stroke
- 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
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
- 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
- F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
- F02M51/066—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
-
- 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
- F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
-
- 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
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
Definitions
- the invention relates to a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine having the features of the preamble of claim 1.
- the fuel injector comprises a magnetic actuator for direct control of a preferably needle-shaped injection valve member, via the stroke movement at least one injection port of the fuel injector is releasable or closable.
- the control of an injection valve member of a fuel substance with an electromagnetic actuator as the actuating means is generally indirect.
- the magnetic actuator comprises a solenoid valve, by means of which a control pressure acting on the injection valve member in a control chamber is variable, so that opening or closing of the injection valve member is effected with change of the control pressure.
- the indirect control proves to be disadvantageous because the required to reduce the control pressure control amount must be fed to a return and then again promoted to high pressure.
- indirectly actuated injection valve members have a delayed response as compared to directly actuated principles. In order to realize a direct control of the injection valve member but so far almost exclusively injector concepts are known which provide for the use of piezoelectric actuators.
- DE 10 2006 015 745 A1 discloses a fuel injector with a directly controlled injection valve member and a magnetic actuator in the form of a solenoid valve.
- a flow channel of a first control chamber can be opened or closed, which is acted upon by an inlet throttle system pressure.
- the injector concept disclosed herein also requires the discharge of a certain amount of purge via a low-pressure end.
- the object of the present invention is to provide a fuel injector with a solenoid actuator that allows direct control of the injection valve member and thus can be operated without backflow.
- the proposed fuel injector should be simple and inexpensive to produce.
- the proposed fuel injector has a magnetic actuator with a liftable anchor element for the direct control of a preferably needle-shaped injection valve member.
- the injection valve member during a first phase of its opening stroke with a hydraulic translator mechanically coupled, which has a control volume limiting hydraulic active surface Ai, which in total with a formed on the injection valve member hydraulic active surface A 2 greater than a formed on the anchor element, the control volume limiting hydraulic Active surface A 3 is, so that due to the area ratio of the relevant in relation to the control volume hydraulic active surfaces Ai, A 2 and A 3, a force gain is effected.
- the injection valve member is mechanically coupled during its closing stroke with the anchor element, the is acted upon in the closing direction of the injection valve member by an armature spring, so that the closing stroke of the injection valve member by means of the armature spring is effected.
- a separate closing spring which acts on the injection valve member in the closing direction with a closing force, is thus unnecessary.
- the elimination of a separate closing spring has the advantage of a reduced manufacturing and voting effort.
- the control volume can be minimized, which has a favorable effect on the response of the input signal.
- the force amplification makes it possible to realize a direct actuation of the injection valve member using a magnetic actuator. The control is therefore carried out without backflow.
- the hydraulic effective area A 2 formed on the injection valve member is selected smaller than the hydraulic effective area A 3 formed on the anchor element.
- the mechanical coupling of the injection stroke is canceled by the hydraulic booster, so that the area ratio of the hydraulic active surfaces relevant in relation to the control volume is now A 2 / A 3 1 amounts to.
- a stop surface on the injection valve member is formed with the hydraulic booster for the mechanical coupling of the egg n p ritzve nti I. The stop surface causes the injection valve member to be entrained during a stroke movement of the hydraulic booster.
- the lifting movement of the hydraulic booster is in turn realized by a lifting movement of the anchor element in the direction of the magnetic actuator and a concomitant lowering of the control pressure in the control volume. Since during this phase of the opening stroke of the injection stroke, the hydraulic active surfaces Ai and A 2 add up and in total are larger than the hydraulic active surface A 3 of the armature element, a force amplification is effected, by means of which the initial high closing force can be overcome.
- a stop is formed on a housing part of the fuel injector.
- the stop serves to unilaterally limit the stroke of the hydraulic translator. This means that the opening stroke of the hydraulic booster is limited in contrast to the opening stroke of the injection valve member.
- the hydraulic booster rests against the stop of the housing part, so that not only the mechanical coupling of the hydraulic booster with the injection valve member but also the hydraulic coupling of the hydraulic booster with the anchor element is released. Only the hydraulic coupling of the injection valve member remains, so that over a surface ratio A 2 / A 3 ⁇ 1, a path gain can be effected.
- the hydraulic booster is disc-shaped or piston-shaped and has a central bore in which the injection valve member is received.
- the stop formed on the injection valve member may be formed, for example, as a radial shoulder in the region of an increase in diameter of the injection valve member.
- the hydraulic booster, the injection valve member and the anchor member arranged coaxially, wherein the armature formed on the hydraulic active surface A 3 is the active surfaces Ai and A 2 opposite.
- the hydraulic booster is acted upon by the pressure force of a spring, by means of which it is ensured that the hydraulic booster rests in the closed position of the injector against the stop of the injection valve member. Therefore, the spring has only to ensure that the hydraulic translator resumes its initial position after an injection process. As a result, a relatively soft spring can be used. At least the spring force is less than that of the armature spring chosen to effect the complete closing stroke of the injection valve member.
- the illustrated fuel injector has a magnetic actuator 1 for actuating an injection valve member 2.
- the injection valve member 2 is guided for releasing and closing at least one injection opening 3 in a liftable manner in a nozzle body 13.
- the solenoid actuator 1 has a likewise liftable anchor element 4, which limits a control volume 5 with a hydraulic active surface A 3 in the axial direction.
- the armature element 4 moves in the direction of the actuator and thus causes a pressure drop in the control volume 5.
- control volume 5 further formed by a formed on a hydraulic translator 6 hydraulic effective area Ai and a formed on the injection valve member 2 hydraulic Impact surface A 2 is limited, there is a hydraulic coupling of this with the anchor element 4. That is, the hydraulic booster 6 and the injection valve member 2 follow the movement of the anchor member 4. Since the sum of the hydraulic effective areas A [and A 2 is greater than the area A 3 , an increase of the force is effected via the area ratio during this first phase of the opening stroke of the opening stroke of the electric drive. To ensure that both the hydraulic transmission 6 and the injection valve member 2 follow the movement of the armature element 4, the hydraulic booster 6 and the injection valve member 2 via a formed on the injection valve member 2 stop surface 8 are mechanically coupled.
- a stop 10 is formed on a housing part 9. If the hydraulic booster 6 comes into abutment with the stopper 10, the mechanical coupling with the injection valve member 2 is released and the injection valve member 2 continues the movement alone.
- the mechanical coupling takes place in the present case in a simple manner, namely by the injection valve member 2 is received in a central bore 11 of the hydraulic booster 6 and to form the stop surface 8 has a region with increased outer diameter, wherein the outer diameter greater than the inner diameter of the central bore 11 is selected is.
- a spring 12 which applies a compressive force to the hydraulic translator 6 in the direction of the abutment surface 8, places the abutment of the hydraulic translator 6 against the abutment surface 8 during the first phase of the opening stroke of the eccentric injection valve 2 or in the closed position of the injector safely.
- the energization of the magnetic actuator 1 is terminated.
- An anchor element 4 in the closing direction with a pressure force acting anchor spring 7 ensures the return of the anchor element 4.
- the return of the spring 10 is also effected via the pressure force of the armature spring 7.
- the spring force of the armature spring 7 is therefore chosen to be relatively high. In any case, the spring force of the armature spring 7 is selected higher than the spring force of the spring 12, which acts on the hydraulic booster in the opening direction of the injection valve member 2.
- a separate closing spring for returning the injection valve member 2 is dispensable, whereby the manufacturing and tuning effort is reduced.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010044205 DE102010044205A1 (de) | 2010-11-22 | 2010-11-22 | Kraftstoffinjektor |
PCT/EP2011/070513 WO2012069393A1 (de) | 2010-11-22 | 2011-11-21 | Kraftstoffinjektor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2643581A1 true EP2643581A1 (de) | 2013-10-02 |
EP2643581B1 EP2643581B1 (de) | 2016-07-06 |
Family
ID=45044561
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11788109.4A Not-in-force EP2643581B1 (de) | 2010-11-22 | 2011-11-21 | Kraftstoffinjektor |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2643581B1 (de) |
CN (1) | CN103221677B (de) |
DE (1) | DE102010044205A1 (de) |
WO (1) | WO2012069393A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014205910A1 (de) * | 2014-03-31 | 2015-10-01 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
US10197025B2 (en) * | 2016-05-12 | 2019-02-05 | Briggs & Stratton Corporation | Fuel delivery injector |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001522140A (ja) * | 1997-11-03 | 2001-11-13 | ディーゼル エンジン リターダーズ,インコーポレイテッド | カスケード電磁アーマチュア |
DE102004035280A1 (de) * | 2004-07-21 | 2006-03-16 | Robert Bosch Gmbh | Kraftstoffinjektor mit direkter mehrstufiger Einspritzventilgliedansteuerung |
DE102006015745A1 (de) | 2006-04-04 | 2007-10-11 | Robert Bosch Gmbh | Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied |
DE102007002758A1 (de) * | 2006-04-04 | 2007-10-11 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102007028490A1 (de) * | 2007-06-21 | 2008-12-24 | Robert Bosch Gmbh | Koppler zur Hubübertragung mittels Scherkraft, Injektor, sowie Verfahren zur Hubübertragung |
DE102008042227A1 (de) * | 2008-09-19 | 2010-04-01 | Robert Bosch Gmbh | Kraftstoff-Injektor |
DE102009047559A1 (de) * | 2009-12-07 | 2011-06-09 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102010028835A1 (de) * | 2010-05-11 | 2011-11-17 | Robert Bosch Gmbh | Kraftstoffinjektor |
-
2010
- 2010-11-22 DE DE201010044205 patent/DE102010044205A1/de not_active Withdrawn
-
2011
- 2011-11-21 WO PCT/EP2011/070513 patent/WO2012069393A1/de active Application Filing
- 2011-11-21 CN CN201180055757.5A patent/CN103221677B/zh not_active Expired - Fee Related
- 2011-11-21 EP EP11788109.4A patent/EP2643581B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2012069393A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN103221677A (zh) | 2013-07-24 |
EP2643581B1 (de) | 2016-07-06 |
WO2012069393A1 (de) | 2012-05-31 |
DE102010044205A1 (de) | 2012-05-24 |
CN103221677B (zh) | 2016-03-09 |
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