DE102009045728A1 - Magnetic valve for use in common-rail injector, has valve housing actuated by armatures in uncontrolled state of magnetic coil, where movement of housing is delayed using damping elements in direction of valve seat - Google Patents
Magnetic valve for use in common-rail injector, has valve housing actuated by armatures in uncontrolled state of magnetic coil, where movement of housing is delayed using damping elements in direction of valve seat Download PDFInfo
- Publication number
- DE102009045728A1 DE102009045728A1 DE200910045728 DE102009045728A DE102009045728A1 DE 102009045728 A1 DE102009045728 A1 DE 102009045728A1 DE 200910045728 DE200910045728 DE 200910045728 DE 102009045728 A DE102009045728 A DE 102009045728A DE 102009045728 A1 DE102009045728 A1 DE 102009045728A1
- Authority
- DE
- Germany
- Prior art keywords
- solenoid valve
- valve
- damping element
- damping
- stop surface
- 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.)
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Links
- 238000013016 damping Methods 0.000 title claims abstract description 62
- 230000003111 delayed effect Effects 0.000 title abstract 2
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 239000000446 fuel Substances 0.000 claims description 24
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims 1
- 238000013461 design Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002996 emotional effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- 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
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Description
Stand der TechnikState of the art
Die Einhaltung der Schadstoffgrenzwerte hat seit der Entwicklung von Verbrennungsmotoren die höchste Priorität. Gerade das Common-Rail-Einspritzsystem hat einen entscheidenden Beitrag zur Reduzierung der Schadstoffe geleistet. Der Vorteil der Common-Rail-Systeme liegt in ihrer Unabhängigkeit des Einspritzdruckes von Drehzahl und Last. Für die Einhaltung zukünftiger Abgasgrenzwerte ist jedoch gerade bei diesen Motoren eine signifikante Erhöhung des Einspritzdruckes notwendig.The compliance with the emission limits has been the highest priority since the development of internal combustion engines. Especially the common rail injection system has made a decisive contribution to the reduction of pollutants. The advantage of the common-rail systems lies in their independence of the injection pressure of speed and load. For compliance with future exhaust emission limits, however, a significant increase in the injection pressure is necessary, especially in these engines.
Neuste Injektoren für höchste Einspritzdrücke werden leckagefrei ausgeführt, indem auf eine Niederdruckstufe verzichtet wird. Durch das Fehlen dieser Druckstufe stehen nur geringe Nadelschließkräfte zur Verfügung. Dies führt zu steilen Kennfeldern und somit zu einer schlechten Kleinstmengenfähigkeit. Dieser Nachteil kann jedoch mit sehr schnell schaltenden Ventilen kompensiert werden.The latest injectors for highest injection pressures are leak-free, by dispensing with a low-pressure stage. Due to the lack of this pressure level only small needle closing forces are available. This leads to steep maps and thus to a poor Kleinstmengenfähigkeit. However, this disadvantage can be compensated with very fast switching valves.
Schnellschaltende Ventile haben häufig das Problem, dass aufgrund eines Prellens Kennfeldwelligkeiten auftreten. Das Nadelprellen tritt bei einem harten Anschlag von Metall auf Metall in Verbindung mit einer schnellen Ventilnadel in Erscheinung. Gerade die Preller beim Schließen haben einen besonders negativen Einfluss auf die Injektorfunktion und führen im Allgemeinen zu großen Hub/Hub-Streuungen. Ein weiteres Problem ist der Sitzverschleiß. Eine hohe Einschlagenergie, die bei einer ungebremsten Nadelbewegung vorhanden ist, führt zu einer Zerrüttung des Sitzes. Undichtigkeiten und Hubdrift sind die Folge. Es ist aus dem Stand der Technik an sich bekannt, dass ein Prellen aufgrund eines harten mechanischen Anschlags mit Hilfe eines hydraulischen Quetschspaltes bekämpft werden kann. Dieser hydraulische Anschlag hat die positive Eigenschaft, dass die Bremskraft potentiell mit dem Ventilhub zunimmt. Bei richtiger Auslegung des Quetschspalts kann die Ventilnadel abrupt abgebremst werden, ähnlich einem mechanischen Anschlag, ohne dass ein Prellen in Erscheinung tritt. Diese Technik wird heute regelmäßig am oberen Hubanschlag bei gattungsgemäßen Magnetventilen eingesetzt. In
Bei einer einfachen Übertragung eines hydraulischen Quetschspalts auf den unteren Hubanschlag tritt jedoch folgendes Problem auf: Zum einen soff der Einschlagimpuls gebremst werden, zum anderen muss sichergestellt sein, dass das Ventil zu jeder Zeit schließt. Rein mechanisch betrachtet ist ein System mit zwei Anschlägen, Ventilsitz und hydraulischer Anschlag, mechanisch überbestimmt. Der hydraulische Anschlag müsste somit relativ „weich” ausgelegt sein, d. h., dass die bremsende Kraft nicht abrupt, sondern mit abnehmendem Hub relativ sanft ansteigt. Theoretisch ist eine derartige Auslegung für eine bestimmte Temperatur möglich. In der Praxis muss die Ventilbewegung für einen großen Temperaturbereich des Fluids ausgelegt sein. So sind Temperaturbereiche von –30°C (Kaltstart) bis zu 150°C und mehr (Volllastbetrieb) die Regel. Da die hydraulische Bremskraft eines Quetschspaltes direkt proportional zu der Viskosität des Fluids, die wiederum stark von der Temperatur abhängig ist, abhängt, ist eine optimale Auslegung eines unteren hydraulischen Hubanschlags im gesamten Temperaturbereich somit nicht möglich.In a simple transfer of a hydraulic squish gap on the lower stroke stop, however, the following problem occurs: Firstly, the impact impulse be braked, on the other hand, it must be ensured that the valve closes at any time. From a purely mechanical point of view, a system with two stops, valve seat and hydraulic stop, is mechanically overdetermined. The hydraulic stop would thus have to be designed relatively "soft", d. h., That the braking force does not increase abruptly, but relatively gently with decreasing stroke. Theoretically, such a design for a certain temperature is possible. In practice, the valve movement must be designed for a wide temperature range of the fluid. Temperature ranges from -30 ° C (cold start) up to 150 ° C and more (full load operation) are the rule. Since the hydraulic braking force of a squish gap is directly proportional to the viscosity of the fluid, which in turn is highly dependent on the temperature, an optimal design of a lower hydraulic stroke stop in the entire temperature range is thus not possible.
Offenbarung der ErfindungDisclosure of the invention
Ausgehend von dem dargelegten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Magnetventil mit den Merkmalen des Oberbegriffs des Anspruchs 1 derart weiterzubilden, dass ein Prellen am unteren Anschlag vermieden wird.Based on the stated prior art, the invention has the object, a solenoid valve with the features of the preamble of
Diese Aufgabe wird bei einem Magnetventil mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved in a solenoid valve having the features of
Vorteilhafte Weiterbildungen des erfindungsgemäßen Magnetventils sind in den Unteransprüchen angegeben. In den Rahmen der Erfindung fallen sämtliche Kombinationen aus zumindest zwei von in der Beschreibung, den Ansprüchen und/oder den Figuren offenbarten Merkmalen.Advantageous developments of the solenoid valve according to the invention are specified in the subclaims. All combinations of at least two features disclosed in the description, the claims and / or the figures fall within the scope of the invention.
Um einerseits einen hydraulisch weich wirkenden Anschlag auszubilden und andererseits es zu ermöglichen, dass das Magnetventil trotz des Vorhandenseins von Fremdpartikeln im Quetschspalt schließen kann ist es in einer vorteilhaften Ausgestaltung der Erfindung vorgesehen, dass das Dämpfungselement axial bewegbar angeordnet ist und von einer Druckfeder in Richtung des Magnetankers belastet ist und, dass bei geschossenem Ventilsitz zwischen dem Dämpfungselement und der hydraulischen Anschlagfläche ein Quetschspalt ausgebildet ist.On the one hand to form a stop acting hydraulically soft and on the other hand to allow the solenoid valve to close despite the presence of foreign particles in the nip, it is provided in an advantageous embodiment of the invention that the damping element is arranged axially movable and by a compression spring in the direction of Magnetic armature is loaded and that is formed with a closed valve seat between the damping element and the hydraulic stop surface, a squish gap.
Darüber hinaus ist es besonders vorteilhaft, wenn der Hub der Druckfeder mittels eines Anschlags begrenzt ist. Dadurch lässt sich der Ort, an dem die hydraulische Dämpfung einsetzt, genau bestimmen und er lässt sich insbesondere auch nahe des unteren Ventilsitzes anordnen.Moreover, it is particularly advantageous if the stroke of the compression spring is limited by means of a stop. As a result, the location where the hydraulic damping begins to determine accurately and he can be arranged in particular also near the lower valve seat.
In einer alternativen Ausführungsform der Erfindung ist es vorgesehen, dass das Dämpfungselement ortsfest angeordnet ist, wobei bei auf dem Ventilsitz aufsitzendem Schließglied zwischen der hydraulischen Anschlagfläche und der Gegenfläche des Magnetankers ein Quetschspalt ausgebildet ist und wobei das Dämpfungselement in Axialrichtung verformbar ist. Auch bei dieser Ausführungsform wird es ermöglicht, dass das Magnetventil trotz des Vorhandenseins von Fremdpartikeln im Quetschspalt schließen kann.In an alternative embodiment of the invention, it is provided that the damping element is arranged in a stationary manner, with a seated on the valve seat closing member between the hydraulic stop surface and the counter surface of the armature is formed a nip and wherein the damping element in the axial direction is deformable. Also in this embodiment, it is possible that the solenoid valve can close despite the presence of foreign particles in the nip.
Um ein Ankleben des Ventils beim Abheben von seinem Sitz zu vermeiden ist es weiterhin besonders vorteilhaft, dass die hydraulische Anschlagfläche und die Gegenfläche des Magnetankers gekippt zueinander angeordnet sind.To avoid sticking of the valve when lifting from its seat, it is furthermore particularly advantageous that the hydraulic stop surface and the counter surface of the magnet armature are arranged tilted to each other.
Um die Dämpfung einstellen zu können ist es in einer weiteren bevorzugten Ausführungsform vorgesehen, dass die hydraulische Anschlagfläche wenigstens eine Durchgangsöffnung aufweist.In order to adjust the damping, it is provided in a further preferred embodiment that the hydraulic stop surface has at least one passage opening.
Ein Kraftstoff-Injektor, insbesondere Common-Rail-Injektor mit einem erfindungsgemäßen Magnetventil hat den Vorteil, dass dessen Kleinstmengenfähigkeit auch über die Lebensdauer des Kraftstoff-Injektors stets gewährleistet ist.A fuel injector, in particular common rail injector with a solenoid valve according to the invention has the advantage that its smallest quantity capability is always guaranteed over the life of the fuel injector.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnungen.Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings.
Diese zeigen in:These show in:
In der
Innerhalb eines Injektorkörpers
Von einer oberen Stirnseite
Der in seinem unteren Abschnitt hülsenförmige Anker
Erfindungsgemäß ist vorgesehen, dass der untere Abschnitt des Ankers
Das Dämpfungselement
Um ein Kleben des Dämpfungsrings
Sobald das Magnetventil
Bei dem in der
Ergänzend wird erwähnt, dass die Dämpfungseigenschaften der Dämpfungsringe
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 102006021735 A1 [0003] DE 102006021735 A1 [0003]
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910045728 DE102009045728A1 (en) | 2009-10-15 | 2009-10-15 | Magnetic valve for use in common-rail injector, has valve housing actuated by armatures in uncontrolled state of magnetic coil, where movement of housing is delayed using damping elements in direction of valve seat |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910045728 DE102009045728A1 (en) | 2009-10-15 | 2009-10-15 | Magnetic valve for use in common-rail injector, has valve housing actuated by armatures in uncontrolled state of magnetic coil, where movement of housing is delayed using damping elements in direction of valve seat |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102009045728A1 true DE102009045728A1 (en) | 2011-04-21 |
Family
ID=43798685
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200910045728 Withdrawn DE102009045728A1 (en) | 2009-10-15 | 2009-10-15 | Magnetic valve for use in common-rail injector, has valve housing actuated by armatures in uncontrolled state of magnetic coil, where movement of housing is delayed using damping elements in direction of valve seat |
Country Status (1)
Country | Link |
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DE (1) | DE102009045728A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009046373A1 (en) | 2009-11-04 | 2011-05-05 | Robert Bosch Gmbh | Magnetic valve e.g. pressure-balanced valve for use in common rail-injector for injecting diesel into combustion chamber of diesel internal combustion engine, has damping chamber connected with low-pressure area by connection |
DE102009046371A1 (en) | 2009-11-04 | 2011-05-05 | Robert Bosch Gmbh | Magnetic valve for fuel injector, comprises armature which is actuated by magnetic coil, where armature is provided as closing unit which controls aperture for fluid, where damping device has damping area |
DE102011083005A1 (en) | 2011-09-20 | 2013-03-21 | Man Diesel & Turbo Se | Method for rinsing armature space of magnetic valve utilized for e.g. controlling mass flow of liquid in internal combustion engine, involves supplying rinsing fluid set under flushing pressure to armature chamber |
ITBO20130169A1 (en) * | 2013-04-17 | 2014-10-18 | Magneti Marelli Spa | ELECTROMAGNETIC FUEL INJECTOR WITH BRAKING DEVICE |
DE102014215879A1 (en) * | 2014-08-11 | 2016-02-11 | Continental Teves Ag & Co. Ohg | Electromagnetic valve |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006021735A1 (en) | 2006-05-10 | 2007-11-15 | Robert Bosch Gmbh | Solenoid valve with flooded anchor space |
-
2009
- 2009-10-15 DE DE200910045728 patent/DE102009045728A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006021735A1 (en) | 2006-05-10 | 2007-11-15 | Robert Bosch Gmbh | Solenoid valve with flooded anchor space |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009046373A1 (en) | 2009-11-04 | 2011-05-05 | Robert Bosch Gmbh | Magnetic valve e.g. pressure-balanced valve for use in common rail-injector for injecting diesel into combustion chamber of diesel internal combustion engine, has damping chamber connected with low-pressure area by connection |
DE102009046371A1 (en) | 2009-11-04 | 2011-05-05 | Robert Bosch Gmbh | Magnetic valve for fuel injector, comprises armature which is actuated by magnetic coil, where armature is provided as closing unit which controls aperture for fluid, where damping device has damping area |
DE102011083005A1 (en) | 2011-09-20 | 2013-03-21 | Man Diesel & Turbo Se | Method for rinsing armature space of magnetic valve utilized for e.g. controlling mass flow of liquid in internal combustion engine, involves supplying rinsing fluid set under flushing pressure to armature chamber |
DE102011083005B4 (en) | 2011-09-20 | 2024-05-08 | Man Energy Solutions Se | Method for flushing an armature chamber of a solenoid valve intended for controlling a fluid mass flow and solenoid valve |
ITBO20130169A1 (en) * | 2013-04-17 | 2014-10-18 | Magneti Marelli Spa | ELECTROMAGNETIC FUEL INJECTOR WITH BRAKING DEVICE |
EP2792877A1 (en) * | 2013-04-17 | 2014-10-22 | Magneti Marelli S.p.A. | Electromagnetic fuel injector with braking device |
US9322374B2 (en) | 2013-04-17 | 2016-04-26 | MAGNETI MARELLI S.p.A. | Electromagnetic fuel injector with braking device |
DE102014215879A1 (en) * | 2014-08-11 | 2016-02-11 | Continental Teves Ag & Co. Ohg | Electromagnetic valve |
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