WO2016059059A1 - 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

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Publication number
WO2016059059A1
WO2016059059A1 PCT/EP2015/073691 EP2015073691W WO2016059059A1 WO 2016059059 A1 WO2016059059 A1 WO 2016059059A1 EP 2015073691 W EP2015073691 W EP 2015073691W WO 2016059059 A1 WO2016059059 A1 WO 2016059059A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
chamber
valve body
control chamber
control
Prior art date
Application number
PCT/EP2015/073691
Other languages
German (de)
English (en)
Inventor
Vincent Dian
Willibald SCHÜRZ
Diego TURRADO BLANCO
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 WO2016059059A1 publication Critical patent/WO2016059059A1/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
    • 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
    • F02M2200/705—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for filling or emptying hydraulic chamber, e.g. for compensating clearance or thermal expansion
    • 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
    • F02M2200/708—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with hydraulic chambers formed by a movable sleeve
    • 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. Furthermore, the invention relates to an internal combustion engine. Due to increasingly stringent legal regulations regarding permissible pollutant emissions of internal combustion engines, which are arranged in motor vehicles, it is necessary to take various measures that contribute to reducing pollutant emissions. A possible starting point here is to optimize the operation of injection valves of the internal combustion engine.
  • An object of the invention is to describe an injection valve which enables reliable and precise operation.
  • an injection valve for injecting fluid into a combustion chamber of an internal combustion engine.
  • the injection valve has an injector body with a fluid inlet and a fluid outlet. Furthermore, the injection valve has a nozzle body with a hydraulically coupled to the fluid inlet recess in which a nozzle needle is arranged axially movable. The nozzle needle prevents fluid flow through an injection opening of the nozzle body in a closed position and otherwise releases it.
  • the injection valve further has a control chamber, which is hydraulically coupled to the fluid inlet and the nozzle needle.
  • the A ⁇ injection valve also has a control valve with a valve body and a valve chamber. The valve chamber is hydraulic with the Control room coupled.
  • 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 body is additionally coupled directly to the control chamber in such a way that a force component, which depends on a pressure prevailing in the control chamber, can be transmitted to the valve 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 in the rule
  • Control chamber a much higher pressure prevails, as in the valve chamber. Due to the direct, additional coupling of VEN til stressess with the control chamber can be ge ⁇ controls a precise closing of the control valve, for example by discharging the actuator.
  • direct coupling is meant a coupling without interposed choke or the like. As a result, the force component is transmitted almost undamped to the valve body. Furthermore, the direct allows
  • Coupling of the valve body with the control chamber that a high closing force can be achieved to close the valve.
  • the direct coupling contributes to a high injection accuracy and precise controllability of the injection valve.
  • an injection quantity of the fluid which depends on the movement of the nozzle needle, can be controlled particularly well.
  • tolerances in the nozzle needle movement can be compensated by the direct coupling of the control chamber with the valve body.
  • the injection valve has a me ⁇ chanic coupling element for transmitting the force component, wherein a valve space associated with the end of the coupling element mechanically interacts with the valve body and a Ven- til ecology remote end of the coupling element is hydraulically coupled to the control chamber.
  • the mechanical coupling element is designed as a pin or pin.
  • the mechanical Kop ⁇ pelelement is disposed axially movable in a bore connecting the control chamber and the valve chamber. This provides a secure guidance of the coupling element when transmitting the
  • the coupling element is fitted into the bore such that a forming sealing gap between the bore and the coupling element in the dynamic operation of the injection valve substantially prevents a fluid exchange between the control chamber and the valve chamber.
  • the sealing gap is preferably about 1 ⁇ m. This results in a mating clearance between the coupling element and the bore, so that no pinching of the pin occurs.
  • the sealing gap is virtually sealed.
  • the hydraulic coupling between the control chamber and the valve chamber is defined, for example, only by an outlet throttle between the control chamber and the valve chamber. In other words, in the dynamic operation of the injection valve, a fluid exchange between the control chamber and the valve chamber is prevented, in particular substantially prevented.
  • the sealing gap is approximately
  • the sealing gap in about 0.5 ym to 1.5 ym.
  • the sealing gap is approximately
  • Force component dependent on a control chamber facing surface of the coupling element is dependent on a cross-sectional area of the coupling element.
  • the injection valve has a spring element which exerts a force on the valve body in a closing direction of the control valve.
  • the Fe ⁇ derelement is preferably a compression spring.
  • the spring element contributes to a safe closing of the control valve.
  • the spring element ensures that the control valve is securely closed even with a non-pressurized injection valve.
  • the actuator is designed to generate a measurement signal which is representative of the force component.
  • Information from an opening start and closing of the nozzle needle can be determined from this measurement signal, since characteristic changes in the prevailing pressure in the control space occur at this time.
  • this measurement signal for example, the injection quantity accuracy can be determined particularly well.
  • the actuator for actuating the valve body is hydraulically coupled to the valve body.
  • a hydraulic clearance compensation integrated into the valve body is provided.
  • FIG. 3 shows a first diagram representation of three voltage curves of an actuator at the time of opening a nozzle needle
  • FIG. 4 shows a second diagram representation of a needle lift profile at the time of opening a nozzle needle
  • Figure 5 is a third diagram showing three voltage waveforms of the actuator at the time of closing of a nozzle needle and Figure 6 is a fourth diagram showing three Nadelhubverrise at the time of closing a due ⁇ nozzle needle.
  • the injection valve 1 shows a schematic sectional view of an injection valve 1.
  • the injection valve 1 has a
  • Injector body 2 in which a fluid inlet 3 is formed
  • the fluid inlet 3 is hydraulically coupled to a high-pressure power accumulator, such as a so-called common rail, and thus is pressurized r
  • the pressure is, for example, up to 2500 bar or higher.
  • the term "fluid" may include a fuel, such as a diesel or gasoline fuel, but the term may include other materials, such as organic compounds such as urea.
  • the injection valve 1 has a nozzle body 4, in which a recess 5 is formed.
  • a nozzle needle 6 is arranged axially movable with respect to a longitudinal axis of the nozzle needle 6.
  • the nozzle needle 6 is seated in a closed position near a tip of the nozzle body 4 on an associated needle valve seat and prevents fluid flow through one or more injection ports 7. If the nozzle needle 6 lifts off from the needle valve seat, a fluid flow is released.
  • the nozzle needle 6 is biased by a nozzle spring 20.
  • the nozzle body 4 is connected via a nozzle retaining nut 18 with the
  • Injector body 2 mechanically coupled. Furthermore, a combustion chamber seal 19 is provided.
  • the recess 5 and the nozzle needle 6 are hydraulically coupled via a nozzle orifice 22 to the fluid inlet 3.
  • the nozzle diaphragm 22 is inserted in a throttle plate 17.
  • the injection valve 1 further has a control chamber 8, which is hydraulically coupled via an inlet throttle 21 of the throttle plate 17 with the fluid inlet 3.
  • the control chamber 8 is further hydraulically coupled to the nozzle needle 6.
  • the control chamber 8 is also hydraulically coupled to a valve space 11 of a control valve 9 via an outlet throttle 23 of the Dros ⁇ selplatte 17.
  • the control valve 9 is arranged in a Ven ⁇ tilplatte 16 and is referred to as a servo valve.
  • the control valve 9 has a valve body 10 which is arranged axially movable in the valve chamber 11.
  • valve body 10 In a closed position of Control valve 9, the valve body 10 is seated on an associated valve seat and prevents fluid flow from the Ven ⁇ tilraum 11 to a fluid drain (not shown).
  • the fluid drain is hydraulically coupled to a low pressure region, such as a fuel tank.
  • the injection valve 1 has an actuator 12, which is designed as a piezoelectric actuator. Alternatively, other materials, such as a magnetostrictive material, may be used for the actuator 12.
  • the actuator 12 is integrated into the injector body 2 and has an actuator head plate 13 and an actuator ⁇ bottom plate 14. About the actuator head plate 13, the actuator 12 is mechanically coupled to the injector body 2.
  • the actuator 12 can be coupled to the control valve 9, in particular to the valve body 10, via the actuator bottom plate 14 in order to actuate it.
  • the actuator 12 is surrounded by a wave spring 15, which biases this.
  • the wave spring 15 seals the actuator 12 itself against the fluid.
  • the injection valve 1 is closed. About the fluid inlet 3, the recess 5, the control chamber 8 and the valve chamber 11 are completely filled with fluid under high pressure.
  • the valve body 10 of the control valve 9 By a balance of forces acting on the valve body 10 of the control valve 9, the valve body 10 is in the closed position.
  • the nozzle needle 6 By another balance of forces, the nozzle needle 6 is also in the closed position.
  • the actuator 12 If the actuator 12 is acted upon by voltage, then the actuator 12 expands and actuates the control valve 9. As a result, the control valve 9 is opened and the pressure in the valve chamber 11 decreases. For example, the pressure drops by 90% to, for example, 200 bar. Due to this pressure drop, fluid flows through the outlet throttle 0
  • valve chamber 11 In the valve chamber 11 from. At the same time less fluid flows through the inlet throttle 21 into the control chamber 8, so that the pressure in the control chamber 8 decreases, but less than compared to the valve chamber 11. For example, the pressure drops to 1300 to 1400 bar the force acting on the nozzle needle 6 force ratio is changed, so that the nozzle needle 6 lifts off from its associated needle valve seat and fluid exits through the injection ports 7. If the actuator 12 is discharged, the control valve 9 closes again, wherein the valve body 10 is pressed back into its valve seat. As a result, the pressure builds up in the valve chamber 11, in the control chamber 8 and in the recess 5 again. The force acting on the nozzle needle 6 balance of power ensures that the nozzle needle 6 is moved back to its closed position.
  • valve body 10 is additionally coupled directly to the control chamber 8. This will be described with the aid of FIG.
  • FIG. 2 shows a schematic, enlarged sectional view of the valve plate 16 with the control valve 9 and the throttle plate 17. Furthermore, the control chamber 8 is partially shown.
  • the valve body 10 is coupled via a mechanical coupling element 24, which is designed as a pin, directly to the control chamber 8.
  • the coupling element 24 is fitted axially movably in a bore 29.
  • the bore 29 connects the valve chamber 11 with the control chamber 8.
  • a valve body 10 facing the end 25 of the valve body 10 is mechanically coupled to the coupling element 24.
  • a valve body 10 facing away from the end 26 faces the control chamber 8.
  • the Ven ⁇ til Economics 10 is separated from the coupling element 24th This he ⁇ makes it possible that the valve body 10 and the Coupling element 24 axially, in particular axially to each other, from ⁇ can judge.
  • Control valve 9 is securely closed.
  • the coupling ⁇ elements 24 and its cross-sectional area can be adjusted in a simple manner, the closing force for closing the control valve 9 precisely.
  • a sealing gap 30 is provided with about 1 ym.
  • a Paa ⁇ approximately play between the bore 29 and the coupling element 24 is set, which causes the dynamic operation of the injection valve 1 is almost no fuel over the sealing gap 30 can flow into the valve chamber. 11
  • the sealing gap 30 is almost dense in dynamic operation.
  • a spring element 28 is provided, which acts on a spring plate 27 and exerts a force on the valve body 10 in the closing direction of the control valve 9.
  • the spring element 28 serves to securely close the control valve 9 even with a non-pressurized injection valve 1.
  • a hydraulic coupling with a play compensation integrated in the valve body 10 is provided instead of a mechanical coupling between the actuator 12 and the valve body 10 which is subject to idling.
  • the actuator 12 is hydraulically connected via a coupling pin 31 to the valve body 10 for actuating the valve body
  • a central bore is introduced into the valve body 10, in which the coupling pin 31 is fitted.
  • the coupling pin 31 defines in the central bore with the valve body 10 a coupling volume 32.
  • a sealing gap is formed, which is analogous to above in about 1 ym.
  • valve space In the exemplary embodiment can be found at about half the height of the valve body 10, two radial bores 33, which the valve space
  • valve body 10 also directly via the coupling element 24 with the control chamber. 8 is coupled. Due to the described force transfer to the valve body 10 by means of the coupling element 24 is always ensured despite the hydraulic clearance compensation that the valve body 10 closes tight and thus no fluid can flow through the valve seat.
  • a voltage U applied to the actuator 12 is plotted in volts (V) against a time t in milliseconds (ms). There are three voltage ⁇ courses when opening the nozzle needle 6 shown.
  • FIG. 4 shows a second schematic diagram representation correlating to FIG. 3, wherein a needle stroke n in millimeters (mm) is plotted against the time t in milliseconds (ms).
  • the needle stroke is understood to mean an axial movement of the nozzle needle 6. Shown are three Nadelhubverstructure at the time of opening the nozzle needle 6, have been determined from the voltage waveforms and plotted against time.
  • Figures 5 and 6 show further Diagrammdar ⁇ positions with voltage waveforms and Nadelhubverierin at the time of closing the nozzle needle. 6

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  • 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 (1) destinée à injecter du fluide dans une chambre de combustion d'un moteur à combustion interne, laquelle soupape d'injection comprend un corps d'injecteur (2) pourvu d'une entrée de fluide (3) et d'une sortie de fluide, et un corps de buse (4) pourvu d'un évidement (5) accouplé hydrauliquement à l'entrée de fluide(3). Dans l'évidement (5), une aiguille de buse (6) est disposée de façon à être mobile axialement ; en position fermée, l'aiguille de buse (6) empêche un écoulement de fluide par un orifice d'injection (7) du corps de buse (4), sinon elle le permet. En outre, il est prévu une chambre de commande (8) qui est accouplé hydrauliquement à l'entrée de fluide (3), à la sortie de fluide et à l'aiguille de buse (6). La soupape d'injection (1) comporte une soupape de commande (9) pourvue d'un corps de soupape (10) et d'une chambre de soupape (11) qui est accouplée hydrauliquement à la chambre de commande (8) ; en fonction d'une position de fermeture du corps de soupape (10), la chambre de soupape (11) est accouplée hydrauliquement à la sortie de fluide. En outre, il est prévu un actionneur (12) qui est accouplé au corps de soupape (10) pour actionner la soupape de commande (9) ; le corps de soupape (10) est en outre accouplé directement à la chambre de commande (8) de sorte qu'une composante de force, qui dépend d'une pression régnant dans l'espace de commande (8), peut être transmise au corps de soupape (10).
PCT/EP2015/073691 2014-10-15 2015-10-13 Soupape d'injection de fluide dans une chambre de combustion d'un moteur à combustion interne WO2016059059A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014220890.4 2014-10-15
DE102014220890.4A DE102014220890A1 (de) 2014-10-15 2014-10-15 Einspritzventil zum Einspritzen von Fluid in einen Brennraum einer Brennkraftmaschine

Publications (1)

Publication Number Publication Date
WO2016059059A1 true WO2016059059A1 (fr) 2016-04-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/073691 WO2016059059A1 (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) DE102014220890A1 (fr)
WO (1) WO2016059059A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016220071A1 (de) * 2016-10-14 2018-04-19 Continental Automotive Gmbh Servoinjektor mit minimalen Ventilraumvolumen
DE102016220074B4 (de) * 2016-10-14 2023-02-02 Vitesco Technologies GmbH Piezo-Common-Rail-Injektor mit hydraulischem Spielausgleich über Bewegung des Ventilsitzes
DE102019220172A1 (de) * 2019-12-19 2021-06-24 Vitesco Technologies GmbH Kraftstoffinjektor für eine Brennkraftmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0816670A1 (fr) * 1996-07-02 1998-01-07 Siemens Automotive Corporation Injecteur commande par élément piézoélectrique avec amplification de la course
EP0909891A1 (fr) * 1997-10-18 1999-04-21 Robert Bosch Gmbh Vanne de commande de fluide
WO2001031192A1 (fr) * 1999-10-23 2001-05-03 Robert Bosch Gmbh Injecteur du systeme d'injection de carburant de moteurs a combustion interne dote d'une precontrainte hydraulique du dispositif demultiplicateur de pression
DE10140524A1 (de) * 2001-08-17 2003-02-27 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE102009000170A1 (de) * 2009-01-13 2010-07-15 Robert Bosch Gmbh Kraftstoffinjektor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4325589B2 (ja) * 2004-07-06 2009-09-02 株式会社デンソー コモンレール用インジェクタ
DE102005030132A1 (de) * 2005-06-28 2007-01-04 Siemens Ag Injektor, insbesondere Kraftstoffinjektor
DE102011090060A1 (de) * 2011-12-28 2013-07-04 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0816670A1 (fr) * 1996-07-02 1998-01-07 Siemens Automotive Corporation Injecteur commande par élément piézoélectrique avec amplification de la course
EP0909891A1 (fr) * 1997-10-18 1999-04-21 Robert Bosch Gmbh Vanne de commande de fluide
WO2001031192A1 (fr) * 1999-10-23 2001-05-03 Robert Bosch Gmbh Injecteur du systeme d'injection de carburant de moteurs a combustion interne dote d'une precontrainte hydraulique du dispositif demultiplicateur de pression
DE10140524A1 (de) * 2001-08-17 2003-02-27 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE102009000170A1 (de) * 2009-01-13 2010-07-15 Robert Bosch Gmbh Kraftstoffinjektor

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