EP2642112B1 - Ventilateur d'injection - Google Patents

Ventilateur d'injection Download PDF

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Publication number
EP2642112B1
EP2642112B1 EP13155422.2A EP13155422A EP2642112B1 EP 2642112 B1 EP2642112 B1 EP 2642112B1 EP 13155422 A EP13155422 A EP 13155422A EP 2642112 B1 EP2642112 B1 EP 2642112B1
Authority
EP
European Patent Office
Prior art keywords
valve needle
spring
end position
valve
injection valve
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.)
Not-in-force
Application number
EP13155422.2A
Other languages
German (de)
English (en)
Other versions
EP2642112A1 (fr
Inventor
Ralf Kromer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2642112A1 publication Critical patent/EP2642112A1/fr
Application granted granted Critical
Publication of EP2642112B1 publication Critical patent/EP2642112B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • 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

Definitions

  • the present invention relates to an injection valve, in particular for injecting fuel into a combustion chamber.
  • FIG. 1 shows a diagram by on the vertical axis a mass 1 of the injected fuel is plotted. On the horizontal axis a drive time 2 of the valve needle is applied. The diagram shows a mass profile 3 of the injected mass 1 of fuel over the activation period 2. Furthermore, a partial lift region 4, a transition region 5 and a full stroke region 6 are identified. At very short opening times in Operahub Schl 4, the stop of the valve needle is not reached.
  • the valve needle For longer opening times in the full-stroke range 6, the valve needle, after it has reached the stop and as long as voltage is applied to the corresponding actuator for the valve needle, at the stop.
  • the transition region 5 is located between the partial lifting region 4 and the full stroke region 6. In this transitional region 5, the valve needle is rebounded from the stop and thus moves in the closing direction at an increased speed. In the transition region in the case of previously known injection valves, this leads to a more or less pronounced decrease in the mass profile 3.
  • WO01 / 38722 A1 discloses a brake spring on the nozzle side of a solenoid valve injection valve.
  • the injection valve according to the invention with the features of claim 1 now makes it possible, in particular in a controlled over the actual opening and / or closing timing control of the valve needle to avoid a drop in the mass profile in the transition region. Due to the injector according to the invention without the axial valve needle stop, the amount of fuel injected increases steadily in the course of the driving time. This leads to a favorable control behavior. The disturbances in the transitional area are eliminated.
  • an injection valve in particular for injecting fuel into a combustion chamber, comprising a housing with at least one injection opening. About this at least one injection port, the fuel from the injection valve is injected into the corresponding combustion chamber. In particular, this is a combustion chamber of an internal combustion engine.
  • a linearly movable valve needle is provided in the housing, with the valve needle closing the at least one injection opening in a first end position and allowing a maximum flow of the fuel through the at least one injection opening in the second end position. Furthermore, an actuator for moving the valve needle between the two end positions is provided.
  • the injection valve is designed so that the valve needle to the second end position is abruptly braked and abuts in the second end position at no, relative to the housing stationary stop.
  • according to the invention eliminates the known axial end stop in the second end position for the valve needle. This avoids that in a transition region between a Operahub Council and a Vollhub Scheme the valve needle rebounds at the axial stop.
  • a braking device for stop-free braking of the valve needle at the second end position.
  • the valve needle is braked shortly before reaching the second end position over a certain Nietumble away, so that the valve needle comes to a standstill in the second end position, without hitting an axial stop.
  • this braking device comprises a spring.
  • the spring is particularly preferably designed as a spiral spring and is according to the invention on a side remote from the injection opening of the valve needle in the housing. Shortly before reaching the second end position, the valve needle runs on this spring and is thus braked.
  • the spring is designed as a progressive spring. This is possible for example by a variable design of the individual gradients of the coil spring.
  • the braking device preferably comprises a hydraulic pad.
  • This hydraulic pad is preferably designed as a fuel-filled chamber in the housing of the injection valve.
  • the hydraulic fluid, in particular the fuel, in the hydraulic cushion is displaced by means of the movement of the valve needle and thus the valve needle is braked.
  • the valve needle runs when moving in the direction of the second end position on the spring and preferably in addition to the hydraulic pad.
  • the invention does not speak of an axial stop, since the spring and preferably in addition the hydraulic pad on which the valve needle runs, in the axial direction is movable and flexible.
  • the spring used, and preferably additionally the hydraulic pad still has a certain mobility or flexibility in the axial direction even after reaching the second end position.
  • the braking device is designed to drive the actuator and thus can decelerate the valve needle in the second end position.
  • the injection valve is designed as a magnetic injection valve.
  • the actuator includes a solenoid for moving the valve pins.
  • the braking device controls the solenoid such that a braking force acts on the valve needle.
  • the valve needle is braked to the second end position by means of a special drive curve for the solenoid.
  • the braking device for example, the spring, the hydraulic pad and the driving of the actuator with each other.
  • FIG. 2 shows for an inventive injection valve 100, as shown in FIG. 3 is shown, a diagram with the mass profile 3. On the vertical axis, the mass 1 of the injected fuel is recorded. The control period 2 of the valve needle is recorded on the horizontal axis. The mass profile 3 shows the respective mass flow of fuel through the at least one injection opening of the injection valve. Furthermore, a partial lift area 4, a transition area 5 and a full lift area 6 are indicated.
  • valve needles in injection valves according to the prior art in the second end position strike against an axial stop fixed relative to the housing. This bounces the previously known Valve needles back and there is the kink in the mass curve 3 in the transition region 5 (see FIG. 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)

Claims (4)

  1. Soupape d'injection, en particulier pour l'injection de carburant dans une chambre de combustion, comprenant :
    - un boîtier avec au moins une ouverture d'injection,
    - une aiguille de soupape déplaçable linéairement dans le boîtier, l'aiguille de soupape, dans une première position d'extrémité, fermant l'au moins une ouverture d'injection et, dans la deuxième position d'extrémité, permettant un débit maximal du carburant à travers l'au moins une ouverture d'injection, et
    - un actionneur pour déplacer l'aiguille de soupape entre les deux positions d'extrémité,
    - l'aiguille de soupape pouvant être freinée sans butée vers la deuxième position d'extrémité et ne s'appliquant contre aucune butée dans la deuxième position d'extrémité,
    caractérisée en ce que
    la soupape d'injection est réalisée sous forme de soupape magnétique d'injection et l'actionneur comprend une bobine magnétique pour déplacer l'aiguille de soupape et en ce qu'un dispositif de freinage pour le freinage sans butée de l'aiguille de soupape est prévu au niveau de la deuxième position d'extrémité, le dispositif de freinage comprenant un ressort et le ressort étant disposé de telle sorte que juste avant d'atteindre la deuxième position d'extrémité, l'aiguille de soupape avance jusqu'à ce ressort et soit ainsi freinée, le ressort se trouvant sur un côté de l'aiguille de soupape opposé à l'ouverture d'injection dans le boîtier et le ressort étant réalisé sous forme de ressort progressif.
  2. Soupape d'injection selon la revendication 1, caractérisée en ce que le ressort est réalisé sous forme de ressort spiral.
  3. Soupape d'injection selon la revendication 1 ou 2, caractérisée en ce que le dispositif de freinage comprend en outre un tampon hydraulique.
  4. Soupape d'injection selon la revendication 3, caractérisée en ce que le tampon hydraulique est réalisé sous forme de chambre remplie de carburant dans le boîtier.
EP13155422.2A 2012-03-19 2013-02-15 Ventilateur d'injection Not-in-force EP2642112B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201210204297 DE102012204297A1 (de) 2012-03-19 2012-03-19 Einspritzventil

Publications (2)

Publication Number Publication Date
EP2642112A1 EP2642112A1 (fr) 2013-09-25
EP2642112B1 true EP2642112B1 (fr) 2016-04-20

Family

ID=47710036

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13155422.2A Not-in-force EP2642112B1 (fr) 2012-03-19 2013-02-15 Ventilateur d'injection

Country Status (2)

Country Link
EP (1) EP2642112B1 (fr)
DE (1) DE102012204297A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11270428A (ja) * 1998-03-24 1999-10-05 Zexel:Kk 筒内噴射装置
WO2001038722A1 (fr) * 1999-11-27 2001-05-31 Robert Bosch Gmbh Soupape d'injection de carburant
WO2011125946A1 (fr) * 2010-04-01 2011-10-13 日立オートモティブシステムズ株式会社 Soupape d'injection de carburant électromagnétique
EP2527637A1 (fr) * 2011-05-23 2012-11-28 Continental Automotive GmbH Injecteur pour injection de fluides

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6363913B1 (en) * 2000-06-09 2002-04-02 Caterpillar Inc. Solid state lift for micrometering in a fuel injector
DE102004004006A1 (de) * 2004-01-27 2005-08-11 Robert Bosch Gmbh Integrierter hydraulischer Druckübersetzer für Kraftstoffinjektoren an Hochdruckspeichereinspritzsystemen
DE102004035313A1 (de) * 2004-07-21 2006-02-16 Robert Bosch Gmbh Kraftstoffinjektor mit zweistufigem Übersetzer
JP4968180B2 (ja) * 2008-05-27 2012-07-04 株式会社デンソー インジェクタ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11270428A (ja) * 1998-03-24 1999-10-05 Zexel:Kk 筒内噴射装置
WO2001038722A1 (fr) * 1999-11-27 2001-05-31 Robert Bosch Gmbh Soupape d'injection de carburant
WO2011125946A1 (fr) * 2010-04-01 2011-10-13 日立オートモティブシステムズ株式会社 Soupape d'injection de carburant électromagnétique
EP2554829A1 (fr) * 2010-04-01 2013-02-06 Hitachi Automotive Systems, Ltd. Soupape d'injection de carburant electromagnetique
EP2527637A1 (fr) * 2011-05-23 2012-11-28 Continental Automotive GmbH Injecteur pour injection de fluides

Also Published As

Publication number Publication date
EP2642112A1 (fr) 2013-09-25
DE102012204297A1 (de) 2013-09-19

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