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WO2016059079A1 - Soupape d'injection de fluide dans une chambre de combustion d'un moteur à combustion interne - Google Patents

Soupape d'injection de fluide dans une chambre de combustion d'un moteur à combustion interne Download PDF

Info

Publication number
WO2016059079A1
WO2016059079A1 PCT/EP2015/073722 EP2015073722W WO2016059079A1 WO 2016059079 A1 WO2016059079 A1 WO 2016059079A1 EP 2015073722 W EP2015073722 W EP 2015073722W WO 2016059079 A1 WO2016059079 A1 WO 2016059079A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
chamber
fluid
injection
injection valve
Prior art date
Application number
PCT/EP2015/073722
Other languages
German (de)
English (en)
Inventor
Wendelin KLÜGL
Original Assignee
Continental Automotive 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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2016059079A1 publication Critical patent/WO2016059079A1/fr

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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves

Definitions

  • Injection valve for injecting fluid into a combustion chamber of an internal combustion engine
  • the invention relates to an injection valve for injecting fluid into a combustion chamber of an internal combustion engine.
  • an injection valve for injecting fluid into a combustion chamber of an internal combustion engine for this purpose.
  • the injection valve has an injector body with a fluid inlet for supplying pressurized fuel fluid and a fluid outlet. Furthermore, the injection valve has a nozzle body with a hydraulically coupled to the fluid inlet recess, in which a Dü- sennadel is arranged axially movable.
  • the nozzle needle un ⁇ terbindet in a closed position, a fluid flow inlet injection openings of the nozzle body and passes this otherwise free.
  • the injector further has a control chamber which is hydraulically ge ⁇ coupled with the fluid inlet, and with the nozzle needle.
  • the injection valve has a control valve with a valve body and a valve chamber.
  • the valve chamber is hydraulically coupled to the control room.
  • the valve chamber can be hydraulically coupled to the fluid outlet.
  • an actuator is provided, which can be coupled to the valve body for actuating the control valve.
  • the valve space is additionally hydraulically coupled with the recess in the nozzle body.
  • the control room is via a throttle with the
  • Valve chamber hydraulically coupled. This contributes to the fact that when opening or closing the control valve usually in the control room a much higher pressure prevails, as in the valve chamber.
  • the hydraulic coupling of the valve chamber with the recess in the nozzle body is suppressed when energized (actuated) actuator. Consequently, the valve space during the injections is not in fluid communication with the recess in the nozzle body, so that it can not lead to an unintentional pressure loss / pressure drop there.
  • the hydraulic coupling between the valve chamber and the recess of the nozzle body is formed as a bore, which opens into the valve chamber in the region of the valve body.
  • a bore can be relatively easy to introduce manufacturing technology in the throttle plate.
  • the valve body closes the bore when actuated actuator and thus prevents the hydraulic coupling between the valve chamber and the recess.
  • the fluid inlet to the recess of the nozzle body is formed with a diaphragm.
  • a pressure difference increase is generated in the fluid inlet.
  • the diaphragm has a diameter of at least 0.6 mm.
  • the increase in the usual aperture diameter helps to reduce the pressure loss in the recess in the nozzle body (nozzle chamber).
  • an inlet throttle is provided between the fluid inlet and the control chamber.
  • a spring element which exerts a force on the valve body in the closing direction of the control valve.
  • the spring ⁇ element is preferably a compression spring.
  • the spring element contributes to a safe closure of the control valve.
  • the spring element ensures that the control valve is securely closed even with a non-pressurized injection valve.
  • Figure 1 is a schematic sectional view of an injection ⁇ valve
  • FIG. 2 shows an enlarged sectional view of the injection valve from FIG. 1.
  • the injection valve 10 comprises an in ⁇ jektor redesign 20, in which is formed a fluid inlet 30th
  • the fluid inlet 30 is hydraulically coupled to a high-pressure fuel storage, such as a so-called common rail, and is thus supplied with a pressurized fuel.
  • a pressurized fuel For example, the pressure is up to 2500 bar or higher.
  • the term "fluid" can comprise a fuel or fuel, for example a diesel ⁇ or gasoline fuel. However, the term may also include other substances, for example organic compounds such as urea.
  • the injection valve 10 has a nozzle body 40 in which a In the recess 50, a nozzle needle 60 is disposed axially movable with respect to a longitudinal axis of the nozzle needle 60.
  • the nozzle needle 60 is seated in a closed position near a tip of the nozzle body 40 on an associated nozzle needle seat 70 and prevents fluid flow through one If the nozzle needle 60 is released from the nozzle needle seat 70, a fluid flow is released a combustion chamber seal 110 v esigned.
  • the recess 50 and the nozzle needle 60 are hydraulically coupled via an aperture 120 to the fluid inlet 30.
  • the diaphragm 120 is inserted in a throttle plate 130.
  • the injection valve 10 furthermore has a control chamber 150 which is hydraulically connected via an inlet throttle 140 in the throttle valve. Seiplatte 130 is coupled to the fluid inlet 30.
  • Control chamber 150 is also hydraulically coupled to the nozzle needle 60.
  • the control chamber 150 is also hydraulically coupled to a valve chamber 160 of a control valve 170 via an outlet throttle 180 in the throttle plate 130.
  • the control valve 170 is disposed in a valve plate 190 and is referred to as a servo valve.
  • the control valve 170 has a valve body 200, which is arranged axially movably in the valve space 160. In a closed position of the control valve 170 of the valve body 200 is seated on an associated valve seat and prevents a flow of fluid from the valve chamber 160 to a fluid outlet 210.
  • the fluid flow 210 is hydraulically coupled to a low ⁇ pressure range, such as a fuel tank.
  • the injection valve 10 has an actuator 220, which is designed as a piezoelectric actuator. Alternatively, other materials, such as a magnetostrictive material, may be used for the actuator 220.
  • the actuator 220 is integrated into the injector body 20 in an invar sleeve and has an actuator head plate 230 and an actuator bottom plate 240.
  • the actuator 220 is mechanically coupled to the injector body 20 via the actuator head plate 230 and the invar sleeve.
  • the actuator 220 can be coupled to the control valve 170, in particular to the valve body 200, for actuation via the actuator bottom plate 240.
  • the actuator 220 is surrounded by a tube spring 250, which biases this.
  • the injection valve 10 is closed. Via the fluid inlet 30, the recess 50, the control chamber 150 and the valve chamber 160 are completely filled with fluid under high pressure.
  • a fluid connection formed in the throttle plate 130 which may be formed, for example, as a bypass throttle, is provided.
  • This fluid connection ⁇ 260 also couples the recess 50 with the valve chamber 160.
  • This fluid communication 260 opens into the The combustion chamber side end of the valve chamber 160 in the same so that when open control valve 170, the valve body 200, the fluid connection 260 prevents. By a balance of forces acting on the valve body 200 of the control valve 170, the valve body 200 is in the closed position.
  • the nozzle needle 60 is also in the closed position.
  • the actuator 220 When the actuator 220 is energized, the actuator 220 expands in its longitudinal direction and actuates the control valve 170. As a result, the control valve 170 is opened and the pressure in the valve chamber 160 decreases. As a result of this pressure drop, fluid flows via the outlet throttle 180 into the valve chamber 160. At the same time, less fluid flows via the inlet throttle 140 into the control chamber 150, so that the pressure in the control chamber 150 decreases, but less so compared to the valve chamber 160. For example, the pressure drops to 1300 to 1400 bar.
  • valve body 200 is thereby in a position in which it shoots the fluid connection 260, so that no fluid from the recess 50 can enter the valve chamber 160.
  • the control valve 170 closes, pushing the valve body 200 back into its valve seat.
  • the fluid connection 260 between the recess 50 and the valve chamber 160 opens due to the axial movement of the valve body 200.
  • the pressure in the valve chamber 160, in the control chamber 150 and in the recess 50 builds up again.
  • the force acting on the nozzle needle 60 force ratio ensures that the nozzle needle 60 is moved back to its closed position.
  • valve body 200 is closed.
  • the fluid connection 260 with the recess 50.
  • FIG. Figure 2 shows a schematic, enlarged sectional view of the valve plate 190 with the control valve 170 and the throttle plate 130 with the aperture 120, the inlet throttle 140, the outlet throttle 180 and the fluid connection 260. Furthermore, the control chamber 150 is partially shown.
  • the valve body 200 is disposed in the valve space 160 and has the shape of a valve mushroom.
  • the valve chamber 160 is at its Aktornahen end with the fluid drain 210 in a couplable fluid connection, at its aktorfernen end is the valve chamber 160 via the outlet throttle 180 with the control chamber in fluid ⁇ connection.
  • the fluid connection 260 exists between the valve chamber 160 and the recess 50 at the actuator-remote end of the valve chamber 160.
  • the valve body 200 is accommodated axially displaceably in the valve chamber 160 and has the shape of a valve mushroom.
  • Valve space 160 causes.
  • the valve body 200 closes the opening into the actuator remote end of the valve chamber 160
  • Fluid connection 260 so that the hydraulic coupling between the valve chamber 160 and the recess 50 is completely prevented.
  • This can be closed via the valve body 200 fluid connection 260, which may be formed as a bypass throttle 260, thus ensuring a minimum leakage during operation of the injection valve 10.
  • the bypass throttle 260 at the piezo additional information, eg. B. in the form of sensor signals or force pulses, which can be used for the injection quantity controls.
  • a spring element 280 is provided in the valve space 160, which acts on the valve body 200 and exerts a force on the valve body 200 in the closing direction of the control valve 170.
  • the spring element 280 serves to securely close the control valve 170 even in the case of a non-pressurized injection valve 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une soupape d'injection (10) destinée à injecter du fluide dans une chambre de combustion d'un moteur à combustion interne. La soupape d'injection (10) comprend un corps d'injecteur (20) qui est pourvu d'une entrée de fluide (30) destinée à amener du carburant liquide sous pression et d'une sortie de fluide (210). En outre, le corps de buse (40) comporte un évidement (50) qui est accouplé hydrauliquement à l'entrée de fluide (30) et dans lequel une aiguille de buse (60) est disposée de façon à être mobile axialement ; dans une position fermée, l'aiguille de buse (60) empêche un écoulement de fluide par un orifice d'injection (80) du corps de buse (40), sinon elle l'autorise. En outre, la soupape d'injection (10) comporte une chambre de commande (150) qui est accouplée hydrauliquement à l'entrée de fluide (30) et à l'aiguille de buse (60). En outre, il est prévu une soupape de commande (170) pourvue d'un corps de soupape (200) et d'une chambre de soupape (160) qui est accouplée hydrauliquement à une chambre de commande (150) ; en fonction d'une position de fermeture du corps de soupape (200), la chambre de soupape (160) peut être accouplée hydrauliquement à la sortie de fluide (210). Il est également prévu un actionneur (220) qui peut être accouplé au corps de soupape (200) pour actionner la soupape de commande (170). La soupape d'injection (10) est caractérisée en ce que la chambre de soupape (160) est accouplée hydrauliquement au corps de buse (40) en plus de l'évidement (50).
PCT/EP2015/073722 2014-10-15 2015-10-13 Soupape d'injection de fluide dans une chambre de combustion d'un moteur à combustion interne WO2016059079A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014220841.6A DE102014220841A1 (de) 2014-10-15 2014-10-15 Einspritzventil zum Einspritzen von Fluid in einen Brennraum einer Brennkraftmaschine
DE102014220841.6 2014-10-15

Publications (1)

Publication Number Publication Date
WO2016059079A1 true WO2016059079A1 (fr) 2016-04-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/073722 WO2016059079A1 (fr) 2014-10-15 2015-10-13 Soupape d'injection de fluide dans une chambre de combustion d'un moteur à combustion interne

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Country Link
DE (1) DE102014220841A1 (fr)
WO (1) WO2016059079A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006067015A1 (fr) * 2004-12-22 2006-06-29 Robert Bosch Gmbh Injecteur de systeme d'injection de carburant d'un moteur a combustion interne
EP1870594A1 (fr) * 2006-06-21 2007-12-26 Denso Corporation Injecteur de carburant
DE102007005382A1 (de) * 2007-02-02 2008-08-07 Robert Bosch Gmbh Leckagefreier Injektor
EP2354526A2 (fr) * 2010-01-28 2011-08-10 Robert Bosch GmbH Injecteur de carburant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001330A1 (de) * 2008-04-23 2009-10-29 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006067015A1 (fr) * 2004-12-22 2006-06-29 Robert Bosch Gmbh Injecteur de systeme d'injection de carburant d'un moteur a combustion interne
EP1870594A1 (fr) * 2006-06-21 2007-12-26 Denso Corporation Injecteur de carburant
DE102007005382A1 (de) * 2007-02-02 2008-08-07 Robert Bosch Gmbh Leckagefreier Injektor
EP2354526A2 (fr) * 2010-01-28 2011-08-10 Robert Bosch GmbH Injecteur de carburant

Also Published As

Publication number Publication date
DE102014220841A1 (de) 2016-04-21

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