EP3026253B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP3026253B1
EP3026253B1 EP15190155.0A EP15190155A EP3026253B1 EP 3026253 B1 EP3026253 B1 EP 3026253B1 EP 15190155 A EP15190155 A EP 15190155A EP 3026253 B1 EP3026253 B1 EP 3026253B1
Authority
EP
European Patent Office
Prior art keywords
region
housing
sensor element
injector
fuel injector
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.)
Active
Application number
EP15190155.0A
Other languages
German (de)
English (en)
Other versions
EP3026253A1 (fr
Inventor
Andreas Hielscher
Holger Rapp
Torsten Leukert
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3026253A1 publication Critical patent/EP3026253A1/fr
Application granted granted Critical
Publication of EP3026253B1 publication Critical patent/EP3026253B1/fr
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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/005—Fuel-injectors combined or associated with other devices the devices being sensors
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/003—Measuring variation of fuel pressure in high pressure line
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/247—Pressure sensors
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8038—Fuel injection apparatus manufacture, repair or assembly the assembly involving use of adhesives, glue or the like

Definitions

  • the invention relates to a fuel injector, in particular a common rail injector, according to the preamble of claim 1.
  • a fuel injector according to the preamble of claim 1 is from the post-published DE 10 2014 209330 A1 the applicant known.
  • a measuring device with a sensor element which is arranged in the region of a supply bore on the injector housing is used in particular for detecting the point in time of the closing of the nozzle needle when it hits its seat in the injector housing and thereby at least indirectly closes the injection opening formed in the injector housing ,
  • the supply bore supplies a high-pressure space, in which the nozzle needle is arranged, with fuel under high pressure.
  • the injector housing in the region of the measuring device on a deformation region which is formed elastically deformable in dependence on the fuel pressure in the supply bore.
  • the deformation area bulges outwards, which can be detected by means of the sensor element.
  • the sensor element is connected to the deformation region by means of an adhesive bond and designed to detect strains or tensile stresses occurring in the contact region to the injector housing, wherein the size or height of the strains is dependent on the pressure in the supply bore.
  • Characteristic of the above-mentioned closing the injection openings through the nozzle needle is that thereby takes place (relatively strong or faster) pressure increase in the supply line, since no more fuel is discharged through the injection openings, wherein the pressure increase is detected by the sensor element.
  • the adhesive bond is exposed not only to different temperatures, but also other environmental influences such as, in particular, soiling or gases which, depending on the composition, can adversely affect the fatigue strength of the adhesive bond.
  • the present invention seeks to protect the region of the adhesive bond between the deformation region and the sensor element from external influences or media that over the prior art, an improved durability, in particular over the life of the fuel injector is achieved.
  • a fuel injector with the characterizing features of claim 1, characterized in that at least the region of the adhesive bond between the deformation region and the sensor element is enclosed by a housing member which seals at least the area of the adhesive bond against the outside environment media-tight.
  • the housing element provided according to the invention, in particular the region of the adhesive bond of the sensor element is protected against environmental influences such as dirt, moisture, oil or similar media.
  • the housing element is filled in the region between the housing element and the adhesive connection with an inert gas. Suitable inert gases include, for example, noble gases (Ne, Ar) or chemically particularly inert gas compounds (CO 2 , SF 6 , or the like).
  • the housing element it is preferred to introduce the inert gas during the production process in the housing element.
  • the housing element by means of a welded joint with the Injector housing is connected, wherein the welding takes place in the desired inert atmosphere.
  • the housing element is evacuated in the region between the housing element and the adhesive bond.
  • this is cup-shaped and surrounds the measuring device completely, with the exception of the deformation region.
  • the housing element has a flange-like area with a connection surface, wherein the connection surface by means of a welded or adhesive connection, preferably by means of a laser weld, is connected to the injector.
  • the welding of the housing element to the injector housing preferably takes place either under an inert atmosphere or under a vacuum.
  • connection elements or connecting cables For electrical contacting of the sensor element, it is necessary to connect this with corresponding connection elements or connecting cables.
  • connection elements or connecting cables For this purpose, it is provided in a further constructive embodiment of the invention that in a wall of the housing element at least one opening for carrying out an electrical contacting of the sensor element is formed, wherein the at least one opening is formed sealed.
  • the particular advantage is achieved that a directed in the direction of the sensor element force is generated, which can be used in addition to contacting.
  • At least one elastically arranged contact element serving for electrical contacting of the sensor element is provided within the housing, which is connected in electrical operative connection with the sensor element, in particular with the side of the sensor element opposite the adhesive connection ,
  • the sensor element is designed as a piezoelectric element.
  • a design of the sensor element as a piezoelectric element has the advantage that such piezoelectric elements can be produced with relatively low costs and are very well suited for detecting the deformations of the deformation region in question with regard to the resolution or measurement accuracy and sampling rate.
  • the arrangement of the deformation region in the region of the supply bore or a branch arranged in operative connection with the supply bore is particularly preferred.
  • This has the advantage that the connection point between the deformation region and the sensor element can be arranged in a region relatively distant from the combustion chamber, in which lower temperatures prevail, in particular during operation of the internal combustion engine, than in a region of the injector housing which is close to the combustion chamber.
  • the connection between the addressed components thermally relatively little claimed.
  • a structural design of the deformation region in the region of a blind-hole-shaped depression or a flattening of the injector housing is preferred. Both variants can manufacture particularly simple and accurate manufacture and also allow the formation of a flat surface for mounting the sensor element by means of the adhesive connection in a relatively simple manner.
  • the Indian Fig. 1 fuel injector 10 shown greatly simplified is designed as a so-called common rail injector, and is used to inject fuel into the combustion chamber, not shown, of an internal combustion engine, in particular a self-igniting internal combustion engine.
  • the fuel injector 10 has an essentially made of metal, possibly multi-part design injector housing 11, in which on the combustion chamber of the internal combustion engine side facing at least one, preferably a plurality of injection openings 12 are arranged for injecting the fuel. Within the injector housing 11, this forms a high-pressure chamber 15, in which a nozzle needle 16 serving as an injection member is arranged in a liftable manner in the direction of the double arrow 17.
  • lowered Position of the nozzle needle 16 forms this together with the inner wall of the high-pressure chamber 15 and the injector 11 a sealing seat, so that the injection openings 12 are at least indirectly closed, such that the injection of fuel from the high-pressure chamber 15 is avoided in the combustion chamber of the internal combustion engine ,
  • this releases the injection openings 12 for injecting the fuel into the combustion chamber of the internal combustion engine.
  • the movement of the nozzle needle 16, in particular for releasing the injection openings 12 takes place in a manner known per se by means of an actuator, not shown, which can be actuated via a voltage supply line 18 by a control device of the internal combustion engine.
  • the actuator may in particular be a magnetic actuator or else a piezoactuator.
  • the supply bore 19 is also connected via a fuel connection, not shown, with a fuel line 22, which in turn is coupled to a fuel reservoir 25 (rail).
  • axially relatively far-spaced portion of the injector 11 is formed in the outer wall 23 by way of example a blind hole-shaped recess 24, so that the wall thickness of the injector 11 is reduced in the region of the recess 24.
  • the injector housing 11 may also have a flattening, in the region of which the wall thickness of the injector housing 11 is reduced.
  • the flat bottom 26 of the recess 24 forms part of a deformation region 27.
  • the injector 11 is for example in operative connection arranged with a branch 28, which in turn opens into the supply hole 19.
  • the fuel pressure currently prevailing in the supply bore 19 also acts in the injector housing 11 on the side facing away from the recess 24.
  • the wall section 29 of the injector housing 11 acts on the recess 24 facing side as a deformation region 27 in the manner of an elastically deformable membrane, wherein the deformation, which forms as a curvature, the higher the instantaneous fuel pressure in the supply bore 19 or the branch 28 is, the greater.
  • the fuel injector 10 has a measuring device 30 on.
  • the measuring device 30 comprises a sensor element 32 designed as a piezo element 31.
  • the piezoelectric element 31 is connected to the deformation region 27 via a material connection in the form of an adhesive connection 34.
  • the adhesive bond 34 is formed over a portion of the surface of the bottom 26 of the recess 24, such that a radially encircling, adhesive-free region 36 is formed between the adhesive bond 34 and a peripheral wall 35 delimiting the recess 24.
  • the piezoelectric element 31, in particular having a round cross-section, or the measuring device 30 is protected against external environmental influences by means of a pot-shaped or cup-shaped housing 40 with a preferably round cross-section.
  • the housing 40 on the base 26 of the recess 24 facing side by way of example a flange-like peripheral edge portion 41 which is connected to the bottom 26 of the recess 24 in the adhesive-free region 36.
  • Particularly preferred for connecting the housing 40 to the injector housing 11 or the base 26 of the recess 24 is the formation of a welded connection, in particular a laser welding connection, such that a completely circumferential laser weld seam 42 is produced.
  • the formation of the welded connection or the laser weld seam 42 takes place according to the invention in an inert atmosphere, or under vacuum, so that in the interior 44 of the housing 40, that is, in particular in the region between the housing 40 and the adhesive connection 34 either an inert gas, or vacuum is formed.
  • the housing 40 which consists in particular of metal, has two apertures 46, 47 in a wall 45 arranged approximately parallel to the surface of the sensor element 32, through which either electrically sealed connecting leads 48, 49 are guided, which are connected to the sensor element 32 or the piezo element 31 are connected, or two plug elements, which are on the piezoelectric element 31 side facing, ie within the interior 45 of the housing 40, with elastically formed contact elements 53, 54, for example in the form of compression springs connected.
  • the contact elements 53, 54 are electrically conductive on the surface of the piezoelectric element 31, in particular in the region of arranged there electrodes of the piezoelectric element 31 (not shown) to the voltages generated by the piezoelectric element 31 in a deformation via the connecting lines 48, 49 a supply not shown control or evaluation.
  • the deformation region 27 elastically deforms outwardly as a function of the fuel pressure prevailing in the supply bore 19.
  • This deformation is transmitted via the adhesive connection 34 to the piezoelectric element 31 and there generates, as a function of the deformation or the tensile stresses, electrical voltages which can be used by means of a suitable evaluation circuit to close at least indirectly on a position of the nozzle needle 16 in the injector housing 11 ,
  • the fuel injector 10 described so far can be modified or modified in many ways, so in particular the shape or structure of the piezoelectric element 31 can deviate from the illustrated embodiments.

Landscapes

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

Claims (8)

  1. Injecteur (10) de carburant, en particulier injecteur à rail commun, présentant un boîtier d'injecteur (11) dans lequel est formé un espace (15) sous haute pression qui peut être alimenté en carburant sous pression par l'intermédiaire d'un alésage d'alimentation (19) disposé dans le boîtier d'injecteur (11), et présentant au moins une ouverture d'injection (12) formée dans le boîtier d'injecteur (11) et reliée au moins indirectement à l'espace (15) sous haute pression, pour injecter du carburant dans l'espace de combustion d'un moteur à combustion interne, un organe d'injection (16) qui libère ou ferme la ou les ouvertures d'injection (12) et un dispositif de mesure (30) qui saisit au moins indirectement la pression qui règne dans l'espace (15) sous haute pression ou dans l'alésage d'alimentation (19), le dispositif de mesure (30) étant configuré pour détecter une déformation élastique d'une partie déformable (27) interagissant au moins indirectement avec l'alésage d'alimentation (19) ou le l'espace (15) sous haute pression,
    le dispositif de mesure (30) présentant un élément de capteur (32) relié par l'intermédiaire d'une liaison collée (34) à la surface de la partie déformable (27), caractérisé en ce que
    au moins la partie de la liaison collée (34) disposée entre la partie déformable (27) et l'élément de capteur (32) est entourée par un élément de boîtier (40) qui assure l'étanchéité aux fluides d'au moins la partie occupée par la liaison collée (34) vis-à-vis de l'environnement extérieur, l'élément de boîtier (40) étant rempli d'un gaz inerte dans la partie située entre l'élément de boîtier (40) et la liaison collée (34) .
  2. Injecteur de carburant selon l'une de la revendication 1, caractérisé en ce que l'élément de boîtier (40) est configuré en forme de godet et entoure complètement le dispositif de mesure (30) à l'exception de la partie occupée par la partie déformable (27).
  3. Injecteur de carburant selon l'une des revendications 1 ou 2, caractérisé en ce que l'élément de boîtier (40) présente une partie périphérique (41) en bride qui est reliée de manière étanche au boîtier d'injecteur (11) au moyen d'une liaison soudée ou collée et de préférence au moyen d'un cordon de soudure (42) formé par laser.
  4. Injecteur de carburant selon l'une des revendications 1 à 3, caractérisé en ce qu'au moins une perforation (46, 47) permettant le passage d'un contact électrique avec l'élément de capteur (32) est formée dans une paroi (45) de l'élément de boîtier (40) et en ce que la partie occupée par la ou les perforations (46, 47) est rendue étanche.
  5. Injecteur de carburant selon la revendication 4, caractérisé en ce qu'au moins un élément de contact (53, 54) disposé élastiquement et servant à assurer le contact électrique l'élément de capteur (32) est prévu à l'intérieur de l'élément de boîtier (40) et est relié de manière à interagir électriquement avec l'élément de capteur (32), en particulier avec le côté de l'élément de capteur (32) situé face à la liaison collée (34).
  6. Injecteur de carburant selon l'une des revendications 1 à 5, caractérisé en ce que l'élément de capteur (32) est configuré comme piézo-élément (31).
  7. Injecteur de carburant selon l'une des revendications 1 à 6, caractérisé en ce que la partie déformable (27) est disposée au niveau d'un creux (24) en forme de trou aveugle ou d'un aplatissement du boîtier d'injecteur (11).
  8. Injecteur de carburant selon l'une des revendications 1 à 7, caractérisé en ce que la partie déformable (27) est disposée au niveau de l'alésage d'alimentation (19) ou d'une dérivation (28) interagissant avec l'alésage d'alimentation (19).
EP15190155.0A 2014-11-20 2015-10-16 Injecteur de carburant Active EP3026253B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014223661.4A DE102014223661A1 (de) 2014-11-20 2014-11-20 Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP3026253A1 EP3026253A1 (fr) 2016-06-01
EP3026253B1 true EP3026253B1 (fr) 2018-04-11

Family

ID=54359809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15190155.0A Active EP3026253B1 (fr) 2014-11-20 2015-10-16 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP3026253B1 (fr)
DE (1) DE102014223661A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5223555B2 (ja) * 2008-02-19 2013-06-26 株式会社デンソー 燃料噴射装置及び蓄圧式燃料噴射装置システム
JP5154495B2 (ja) * 2009-04-03 2013-02-27 株式会社日本自動車部品総合研究所 燃料噴射弁及び燃料噴射弁の内部電気接続方法
JP5703912B2 (ja) * 2011-04-01 2015-04-22 株式会社デンソー 電子部品装置
JP5522108B2 (ja) * 2011-04-01 2014-06-18 株式会社デンソー センサ装置
DE102014209330A1 (de) 2014-05-16 2015-11-19 Robert Bosch Gmbh Vorrichtung zur Erfassung des Kraftstoffdrucks für einen Kraftstoffinjektor, Kraftstoffinjektor sowie Kraftstoffzuführleitung zu einem Kraftstoffinjektor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DE102014223661A1 (de) 2016-05-25
EP3026253A1 (fr) 2016-06-01

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