EP1563182A1 - Injecteur dote d'un pointeau a niveaux a entrainement direct pour l'injection de carburant dans un moteur a combustion interne - Google Patents

Injecteur dote d'un pointeau a niveaux a entrainement direct pour l'injection de carburant dans un moteur a combustion interne

Info

Publication number
EP1563182A1
EP1563182A1 EP03767443A EP03767443A EP1563182A1 EP 1563182 A1 EP1563182 A1 EP 1563182A1 EP 03767443 A EP03767443 A EP 03767443A EP 03767443 A EP03767443 A EP 03767443A EP 1563182 A1 EP1563182 A1 EP 1563182A1
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
actuator
nozzle
needle
register
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
Application number
EP03767443A
Other languages
German (de)
English (en)
Other versions
EP1563182B1 (fr
Inventor
Wendelin KLÜGL
Willibald SCHÜRZ
Clemens Senghaas
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.)
Aumovio Germany GmbH
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1563182A1 publication Critical patent/EP1563182A1/fr
Application granted granted Critical
Publication of EP1563182B1 publication Critical patent/EP1563182B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive 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
    • 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
    • F02M61/167—Means 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
    • 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
    • F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical

Definitions

  • the invention relates to an injector for fuel injection into an internal combustion engine, which has a register nozzle needle which is arranged in an axial bore of a nozzle body and closes the existing spray holes of the nozzle body by means of a compression spring in the uncontrolled state, according to the preamble of the main claim ,
  • the problem arises in particular in the case of powerful engines that the injectors, for example under certain operating conditions such as high loads. B. in the acceleration phase have to inject a lot more fuel (gasoline or diesel) into the combustion chambers of the engine than would be necessary at low or normal load. This problem is exacerbated by the fact that the statutory limits for emission protection must also be observed in all operating conditions.
  • a piezoelectric actuator is often used to control the injector since, by applying a pulsed control voltage, it performs a reversible change in length, which can be used to actuate the nozzle needle, in particular also in the case of multiple injection.
  • a servo valve has so far been connected between the actuator and the valve unit, which can be designed with a corresponding transmission ratio and thus indirectly controls the nozzle needle.
  • an injector with a register nozzle needle is also known, which is used to increase the spraying fuel quantity is formed in two stages.
  • the register nozzle needle has a hollow needle into which a second nozzle needle is inserted.
  • both nozzle needles close spray holes which are separated by spring pressure. If the fuel pressure in the nozzle area is increased, then the nozzle needle with the weakest spring pressure opens, ie first the second nozzle needle and, if the fuel pressure continues to increase, the hollow needle in order to achieve the desired injection quantity of the fuel.
  • This type of control of the two nozzle needles is therefore also indirect and can be done via a servo valve.
  • a fuel injector is also known from EP 0995 901 A1, in which a piezoelectric actuator is used to control the nozzle needle.
  • a piezoelectric actuator is used to control the nozzle needle.
  • the actuator is designed in such a way that the spray holes are only closed securely when a correspondingly high control voltage U is applied to the actuator.
  • the actuator is stretched out and exerts a corresponding force on the nozzle needle via a compression spring, which leads to the closing of the spray holes.
  • the nozzle needle is controlled directly by the actuator. It is disadvantageous, however, that if the control voltage is missing, the spray holes are not securely closed, so that fuel can escape in an undesirable manner and at unsuitable times.
  • the main claim has the advantage that, on the one hand, a register nozzle needle with a high injection quantity can be used.
  • the register nozzle needle is directly controlled by a mechanical coupling from an actuator, so that no servo valve is required. It is considered particularly advantageous that the actuator can be controlled very easily by an applied control voltage can, so that both needles can be operated very specifically. In this way it is possible to inject an optimal amount of fuel in every operating situation of the engine.
  • a deflection device is arranged between the actuator and the nozzle needle in the case of an inwardly opening register nozzle needle. This ensures that the spray holes of the two stages are securely closed when the actuator is deactivated, so that the fuel can only escape when the actuator is activated. This advantageously prevents fuel dripping or running on of fuel.
  • the deflection device can be implemented with a lever, at one end of which the actuator presses and the second end of which raises the nozzle needle.
  • the nozzle body is used as an abutment for the lever, so that there is a relative movement between the nozzle body and the nozzle needle.
  • a sleeve is advantageously arranged between the injector and the deflection device.
  • the injector can press the lever over the sleeve.
  • the second end of the lever then presses against a collar plate of the register nozzle needle from below, so that it can lift out of its seat. In this way, a very simple reversal for opening the two stages of the nozzle needles is achieved.
  • a hydraulic converter can be used instead of the lever.
  • both nozzle needles of the register nozzle needle are pressed against the spray holes with a compression spring, the spray holes are securely closed when the actuator is de-energized. Furthermore, the springs ensure that there is no mechanical play between the actuator and the register nozzle needle, so that the actuator movement can be transmitted directly to the nozzle needles.
  • the invention is based on the object of designing an injector for fuel injection with a piezoelectric actuator which actuates a register nozzle needle directly. This problem is solved with the features of the main claim.
  • FIG. 1 shows a schematic representation of a first exemplary embodiment of the invention
  • FIG. 2 shows a cross section through a nozzle body
  • FIG. 3 shows a section of a nozzle body with a register nozzle needle
  • FIG. 4 shows a further exemplary embodiment with a deflection device which has a hydraulic converter.
  • an injector housing 1 which has a high-pressure connection 12 for the fuel supply in the upper part.
  • a nozzle body 4 is screwed onto the injector housing 1 by means of a nozzle clamping nut 6.
  • a register nozzle needle 5 is arranged in the inside of the nozzle body 4, as will be explained in more detail in FIG. 3.
  • a hydraulic lash adjuster 2 is provided in the upper part of the injector housing 1 along the central axis, for example as an open hydraulic bearing
  • the lower end of the hydraulic bearing 2 is closed by a base plate to which the upper part of a piezoelectric actuator 3 is attached.
  • the actuator 3 is closed with a base plate 7, which acts on a deflection device 9 via a sleeve 8.
  • a control voltage is applied to the actuator 3, this lengthens accordingly and then presses via the sleeve 8 onto the deflection device 9, which in this case is essentially formed from two levers.
  • one lever is enough.
  • two levers 9 have been provided here, which bear against corresponding two sides of a collar plate 10 of a register nozzle needle 5.
  • the levers 9 are designed so that the
  • the levers 9 are supported with their abutments on the nozzle body 4.
  • the lever ratio can of course be used in the construction of the levers, for example to increase the stroke of the register nozzle needle 5.
  • a compression spring 11 is arranged inside the sleeve 8, which ensures that, on the one hand, the stroke transmission of the actuator 3 is free of play.
  • the spring force when the actuator 3 is not activated, i.e. when the actuator 3 is de-energized the register nozzle needles 5 are pressed against the corresponding spray holes 16, 19, so that these are closed in a fuel-tight manner.
  • the hydraulic force of the fuel pressure also acts as a closing force. This ensures that the drive system always has play-free contact with the base plate 7, the levers 9 and the flange plate 10 of the register nozzle needle 5.
  • An electrical connection for the actuator 3 is provided in the upper right part of FIG. 1 (without reference numerals).
  • the fuel flows through the high-pressure connection 12 of the injector housing 1 and flows past the hydraulic lash adjuster 2 and the actuator 3 to the nozzle assembly 4, 5.
  • a nozzle needle guide 13 is provided, which has four ground key surfaces.
  • a cross section of the nozzle body 4 is shown in FIG. 2 for better understanding. The cross section was drawn at the section line A-A ( Figure 1). It first shows the annular nozzle clamping nut 6, which surrounds the nozzle body 4. in the
  • the register nozzle needle 5 can be seen in the center as well as the four sharpened key surfaces, which the fuel can flow past.
  • FIG 3 shows a second embodiment of the invention in which the nozzle body 4 of Figure 1 has been replaced.
  • the register nozzle needle 5 consists of a hollow needle 15 and a central nozzle needle 17, which are coaxially assembled and each have a collar plate 14 and 18, respectively.
  • the collar plate 18 of the central nozzle needle 17 protrudes with a predetermined distance s over the collar plate 14 of the hollow needle 15 and at least partially covers it.
  • the length of the two nozzle needles is dimensioned such that, when the spray holes 16, 19 are closed, the collar plate 18 protrudes by the predetermined distance s.
  • the central nozzle needle 17 can therefore only move when the hollow needle 15 has completed a stroke corresponding to the distance s.
  • the central nozzle needle 17 is then entrained.
  • two compression springs 20, 21 are provided which press on the corresponding collar plates 14, 18. They thus keep the spray holes 16, 19 closed when the actuator is de-energized.
  • the deflection device 9 described for FIG. 1 can again be used as the valve drive, which then attaches again below the collar plate 14 and presses it upward when the actuator is expanded.
  • the stroke of the two nozzle needles 15, 17 can now be controlled with the amplitude of a control voltage on the actuator.
  • a control voltage With a smaller control voltage, only the hollow needle 15 initially moves until its stroke corresponds to the distance s.
  • the central nozzle needle 17 is then entrained and all the spray holes 16, 19 of the two stages are opened.
  • FIG. 4 shows a further exemplary embodiment of the invention for direct actuation of the register nozzle needle 5.
  • the levers of the deflection device 9 have been replaced by a hydraulic converter.
  • the base plate of the actuator 3 is now as
  • Actuator piston 23 is formed which, when the actuator 3 is extended, presses on a pressure chamber 22 filled with fuel. In accordance with the pressure, the fuel now flows via a connecting line 24 into a lifting chamber 25 which surrounds the hollow needle 15 in an annular manner.
  • the flange plate 14 of the hollow needle 15 is also formed in this case as a piston, which first entrains the hollow needle 15 and then the central nozzle needle 17, as was described above. The remaining parts of FIG. 4 have already been explained for FIG. 3.

Landscapes

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

Abstract

L'invention concerne un injecteur piézo-électrique doté d'un pointeau à niveaux (5) à entraînement direct pour l'injection de carburant dans un moteur à combustion interne. Pour ouvrir les orifices d'injection (16, 19), les deux aiguilles (15, 17) du pointeau à niveaux (5) ne sont pas actionnées, comme cela est usuellement le cas, par une servovalve ou par la pression du carburant développée dans l'injecteur, mais directement par l'actionneur (3) piézo-électrique. Cet actionneur (3) piézo-électrique présente ainsi l'avantage de commander directement les deux aiguilles (15, 17) au moyen de l'amplitude d'une tension de commande qui lui est appliquée. Lorsqu'ils ne sont pas activés, des ressorts de pression (11; 20, 21) maintiennent les orifices d'injection (16, 19) des deux niveaux fermés.
EP03767443A 2002-11-20 2003-11-20 Injecteur dote d'un pointeau a niveaux a entrainement direct pour l'injection de carburant dans un moteur a combustion interne Expired - Lifetime EP1563182B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2002154186 DE10254186A1 (de) 2002-11-20 2002-11-20 Injektor mit einer direkt angetriebenen Register-Düsennadel für die Kraftstoffeinspritzung in einen Verbrennungsmotor
DE10254186 2002-11-20
PCT/DE2003/003850 WO2004046540A1 (fr) 2002-11-20 2003-11-20 Injecteur dote d'un pointeau a niveaux a entrainement direct pour l'injection de carburant dans un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1563182A1 true EP1563182A1 (fr) 2005-08-17
EP1563182B1 EP1563182B1 (fr) 2012-01-11

Family

ID=32318582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03767443A Expired - Lifetime EP1563182B1 (fr) 2002-11-20 2003-11-20 Injecteur dote d'un pointeau a niveaux a entrainement direct pour l'injection de carburant dans un moteur a combustion interne

Country Status (3)

Country Link
EP (1) EP1563182B1 (fr)
DE (1) DE10254186A1 (fr)
WO (1) WO2004046540A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE10307003B3 (de) * 2003-02-19 2004-05-13 Siemens Ag Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine
DE10336327B4 (de) * 2003-08-07 2016-03-17 Robert Bosch Gmbh Injektor für Kraftstoff-Einspritzsysteme von Brennkraftmaschinen, insbesondere von direkteinspritzenden Dieselmotoren
DE102004011095A1 (de) * 2004-03-06 2005-09-22 Robert Bosch Gmbh Kraftstoffeinspritzventil
DE102004060550A1 (de) * 2004-12-16 2006-07-06 Robert Bosch Gmbh Kraftstoffeinspritzdüse
EP1693562B1 (fr) * 2005-01-19 2007-05-30 Delphi Technologies, Inc. Soupape d'injection de carburant
DE602005005159T2 (de) 2005-01-19 2009-04-30 Delphi Technologies, Inc., Troy Kraftstoffeinspritzventil
DE102005024707A1 (de) * 2005-05-30 2006-12-07 Robert Bosch Gmbh Kraftstoffeinspritzdüse
DE102005054361A1 (de) * 2005-11-15 2007-05-24 Fev Motorentechnik Gmbh Hochdruckkraftstoffinjektor
EP1996812B1 (fr) * 2006-03-10 2012-05-16 Volvo Lastvagnar AB Système d'injection de carburant
EP1843038B1 (fr) * 2006-04-07 2009-03-18 Continental Automotive GmbH Injecteur de carburant avec corps à surfaces d'étanchéité coniques haute pression
DE102006031567A1 (de) * 2006-07-07 2008-01-10 Siemens Ag Einspritzsystem und Verfahren zum Herstellen eines Einspritzsystems
DE102007036571B3 (de) * 2007-08-03 2009-04-02 Continental Automotive Gmbh Injektor und Vorrichtung mit einem Gefäß und einem das Gefäß umschließenden Gehäuse
DE102012211233A1 (de) 2012-06-29 2014-01-02 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102012216688A1 (de) 2012-09-18 2014-03-20 Robert Bosch Gmbh Brennstoffeinspritzventil
CN103195627A (zh) * 2013-03-26 2013-07-10 哈尔滨工程大学 直接控制式压电喷油器

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Also Published As

Publication number Publication date
EP1563182B1 (fr) 2012-01-11
DE10254186A1 (de) 2004-06-17
WO2004046540A1 (fr) 2004-06-03

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