EP3018337B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP3018337B1
EP3018337B1 EP15190124.6A EP15190124A EP3018337B1 EP 3018337 B1 EP3018337 B1 EP 3018337B1 EP 15190124 A EP15190124 A EP 15190124A EP 3018337 B1 EP3018337 B1 EP 3018337B1
Authority
EP
European Patent Office
Prior art keywords
sensor element
housing
fuel injector
injector
fuel
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
EP15190124.6A
Other languages
German (de)
English (en)
Other versions
EP3018337A1 (fr
Inventor
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 EP3018337A1 publication Critical patent/EP3018337A1/fr
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Publication of EP3018337B1 publication Critical patent/EP3018337B1/fr
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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
    • 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
    • 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
    • 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
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering

Definitions

  • 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 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.
  • a fuel injector in which a pressure sensor is screwed by means of a biasing plate against the injector body.
  • the invention has the object, a fuel injector according to the preamble of claim 1, wherein the sensor element is connected to the deformation region via an adhesive bond, such that a reliable over the operating life of the fuel injector compound or Coupling of the sensor element is achieved at the deformation region by means of the adhesive connection.
  • This object is achieved with a fuel injector with the characterizing features of claim 1.
  • the support device is arranged in operative connection with the sensor element such that a force component is achieved on the sensor element by means of the support device, which is aligned at least substantially perpendicular to the sensor surface or to the adhesive connection.
  • the support device is supported on the side of the sensor element facing away from the adhesive connection via an elastic intermediate element on the sensor element.
  • the elastic intermediate element causes for a mechanical relief of the sensor element or the avoidance of mechanical damage to the sensor element and on the other hand, the application of an elastic biasing force on the sensor element, which is particularly suitable for deformation of the deformation region and an associated movement of the sensor element with respect to to allow or allow the support device. This in turn improves the resolution or accuracy of the deformation of the deformation region detected by the sensor element.
  • this has a preferably made of metal housing, which is connected to the injector by means of a welded joint, preferably by means of a laser weld.
  • a connection can be relatively easily integrated in the manufacturing process of the fuel injector and enables a secure and reliable connection of the housing to the injector housing.
  • the sensor element is designed as a piezoelectric element. Such a sensor element enables a reliable and reliable detection of stresses in the surface of the deformation region and thus a conclusion on the deformation of the deformation region, caused by the fuel pressure, at relatively low production costs.
  • the support device is arranged in operative connection with the sensor element only in a partial region of the sensor element, preferably in a radially encircling partial region of the sensor element.
  • the support means is supported on the piezoelectric element via an annular portion which is flush with the outer periphery of the piezoelectric element.
  • the housing is cup-shaped and seals the sensor element against the environment media-tight.
  • the access of media which affects the functionality of the sensor element, so that the reliability of the measuring device is increased, is prevented, in particular over the service life of the fuel injector.
  • 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 be produced particularly easily and accurately in terms of production technology and, moreover, enable the formation of a flat surface for connecting the sensor element in the region of the adhesive connection in a relatively simple manner.
  • 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.
  • 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.
  • a nozzle needle 16 serving as an injection member is arranged in a liftable manner in the direction of the double arrow 17.
  • this forms 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 in the Combustion chamber of the internal combustion engine is avoided.
  • the nozzle needle 16 In the other, not shown, lifted from the sealing seat position of the nozzle needle 16, 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 of the high-pressure chamber 15 with fuel under high pressure takes place via a valve disposed within the injector housing 11 or formed in components of the fuel injector 10 Supply bore 19, which in particular eccentrically to the longitudinal axis 21 of the injector 11 in an edge region of the fuel injector 10, at least substantially parallel to the longitudinal axis 21 extends.
  • 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 arranged for example in operative connection 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 fuel injector 10 For detecting the instantaneous fuel pressure in the branch 28 or in the supply bore 19 and thus also in the high-pressure chamber 15, which is used as an indication of the instantaneous position of the nozzle needle 16 for controlling the nozzle needle 16, the fuel injector 10 has a measuring device 30.
  • 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. On the side of the piezoelectric element 31 opposite the adhesive joint 34, this is arranged in operative connection with a support device 35.
  • the support means 35 comprises a support ring 36, preferably made of metal, which is in operative connection with a partial region of the adhesive surface 34 opposite end face of the piezoelectric element 31, in particular via an annular peripheral outer portion 37, with the interposition of an elastic, preferably also annular intermediate member 38 is arranged with the piezoelectric element 31.
  • the support ring 36 is rigidly connected to the (metallic) injector housing 11 via a weld seam 39, which at least partially surrounds its outer circumference and which is preferably designed as a laser weld seam. It is essential that an at least substantially perpendicular to the surface of the piezoelectric element 31 acting axial force F is generated by the rigid connection of the support ring 36 and the support means 35 to the piezoelectric element 31, which also acts on the adhesive connection 34 via the piezoelectric element 31.
  • the electrical contacting of the piezoelectric element 31 takes place in a manner known per se, and therefore not shown, on the end face of the piezoelectric element 31 opposite the adhesive joint 34 in the central region of the piezoelectric element 31, i. in the released from the support ring 36 central region of the piezoelectric element 31st
  • modified support means 40 differs from the support means 35 by the use of a cup-shaped housing 41 instead of the support ring 36.
  • the housing 41 is connected in analogy to the support ring 36 via a welded joint 39 with the injector 11. Due to the cup-shaped design of the housing 41, a media-tight seal of both the sensor element 32, as well as the recess 24 is achieved on the injector 11.
  • housing wall 42 of the housing 41 has two openings 43, 44 are formed through which two, the electrical contacting of the piezoelectric element 31 serving contact pins or connector elements 45, 46 protrude.
  • the plug elements 45, 46 are sealing in the region of the openings 43, 44 with the housing 11 and rigidly connected.
  • a contact element 47, 48 formed by way of example as a compression spring, in particular with their two electrodes serving the electrical contacting of the piezo element 31 (which, for the sake of simplicity not shown in the drawing).
  • 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, 31a 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, at least indirectly to a position of the nozzle needle 16 in the injector housing 11 close.
  • the fuel injector 10 described so far can be modified or modified in many ways without departing from the spirit of the invention, so in particular the shape or structure of the piezoelectric element 31, 31a may differ from the illustrated embodiments.

Claims (9)

  1. Injecteur de carburant (10), 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),
    au moins une ouverture d'injection (12) reliée au moins indirectement à l'espace (15) sous haute pression et formée dans le boîtier d'injecteur (11) pour injecter du carburant dans la chambre de combustion d'un moteur à combustion interne,
    un organe d'injection qui libère ou ferme la ou les ouvertures d'injection (12),
    un dispositif de mesure (30) qui saisit au moins indirectement la pression qui règne dans l'espace (15) sous haute pression ou l'alésage d'alimentation (19),
    le dispositif de mesure (35) étant configuré pour saisir la déformation élastique d'une partie déformable (27) disposée de manière à coopérer au moins indirectement avec l'alésage d'alimentation (19) ou 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
    une force est appliquée sur l'élément de capteur (32) en direction de la partie déformable (27) au moyen d'un dispositif de soutien (35; 40) et
    en ce que par l'intermédiaire d'un élément intermédiaire élastique (38), le dispositif de soutien (35; 40) s'appuie sur l'élément de capteur (32) par le côté de l'élément de capteur (32) non tourné vers la liaison collée (34).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que le dispositif de soutien (35; 40) est relié rigidement au boîtier d'injecteur (11).
  3. Injecteur de carburant selon la revendication 1, caractérisé en ce que le dispositif de soutien (35; 40) présente un boîtier (41) réalisé de préférence en métal et relié au boîtier d'injecteur (11) au moyen d'une liaison soudée (39), de préférence au moyen d'un cordon de soudure formé au laser.
  4. Injecteur de carburant selon l'une des revendications 1 à 3, caractérisé en ce que l'élément de capteur (32) est configuré comme piézo-élément (31; 31a).
  5. Injecteur de carburant selon l'une des revendications 1 à 4, caractérisé en ce que le dispositif de soutien (35; 40) n'est relié fonctionnellement à l'élément de capteur (32) que dans une partie (37) de l'élément de capteur (32), notamment dans une partie (37) périphérique de la bordure de l'élément de capteur (32).
  6. Injecteur de carburant selon l'une des revendications 3 à 5, caractérisé en ce qu'il présente des éléments de fiche (45, 46) disposés rigidement sur le boîtier (41) et permettant de réaliser le contact électrique avec l'élément de capteur (32) et en ce que les éléments de fiche (45, 46) sont disposés de manière à coopérer électriquement avec l'élément de capteur (32) et en particulier avec le côté de l'élément de capteur (32) situé face à la liaison collée (34) au moyen d'éléments de contact (47, 48) placés élastiquement.
  7. Injecteur de carburant selon l'une des revendications 3 à 6, caractérisé en ce que le boîtier (41) est configuré en forme de godet et en ce qu'il assure l'étanchéité de l'élément de capteur (32) vis-à-vis du fluide de l'environnement.
  8. Injecteur de carburant selon l'une des revendications 1 à 7, 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).
  9. Injecteur de carburant selon l'une des revendications 1 à 8, caractérisé en ce que la partie déformable (27) est disposée au niveau de l'alésage d'alimentation (19) ou d'un dérivation (28) coopérant avec l'alésage d'alimentation (19).
EP15190124.6A 2014-11-07 2015-10-16 Injecteur de carburant Active EP3018337B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014222811.5A DE102014222811A1 (de) 2014-11-07 2014-11-07 Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP3018337A1 EP3018337A1 (fr) 2016-05-11
EP3018337B1 true EP3018337B1 (fr) 2018-03-14

Family

ID=54359795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15190124.6A Active EP3018337B1 (fr) 2014-11-07 2015-10-16 Injecteur de carburant

Country Status (2)

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EP (1) EP3018337B1 (fr)
DE (1) DE102014222811A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015206023A1 (de) * 2015-04-02 2016-10-06 Robert Bosch Gmbh Kraftstoffinjektor
DE102015206032A1 (de) 2015-04-02 2016-10-06 Robert Bosch Gmbh Kraftstoffinjektor und Verfahren zum Herstellen eines Kraftstoffinjektors
EP3088729B1 (fr) * 2015-04-30 2018-07-04 Robert Bosch Gmbh Injecteur de carburant et dispositif et procede de montage d'un dispositif de mesure
DE102015208069A1 (de) 2015-04-30 2016-11-03 Robert Bosch Gmbh Kraftstoffinjektor
DE102015223902A1 (de) 2015-12-01 2017-06-01 Robert Bosch Gmbh Sensorvorrichtung und Kraftstoffinjektor mit einer Sensorvorrichtung
DE102015225047A1 (de) 2015-12-14 2017-06-14 Robert Bosch Gmbh Sensorvorrichtung und Kraftstoffinjektor mit einer Sensorvorrichtung
DE102016204801A1 (de) * 2016-03-23 2017-09-28 Robert Bosch Gmbh Kraftstoffinjektor
DE102017209560A1 (de) 2017-06-07 2018-12-13 Robert Bosch Gmbh Kraftstoffinjektor
DE102019200232A1 (de) * 2019-01-10 2020-07-16 Robert Bosch Gmbh Kraftstoffinjektor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5383132B2 (ja) * 2008-03-28 2014-01-08 株式会社デンソー 燃圧センサ搭載構造、燃圧検出システム、燃料噴射装置、それに用いられる圧力検出装置及び蓄圧式燃料噴射装置システム
DE102014204629A1 (de) * 2014-03-13 2015-09-17 Robert Bosch Gmbh Kraftstoffinjektor, insbesondere Common-Rail-Injektor
DE102014204746A1 (de) * 2014-03-14 2015-09-17 Robert Bosch Gmbh Kraftstoffinjektor, insbesondere Common-Rail-Injektor
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
DE102014222811A1 (de) 2016-05-12
EP3018337A1 (fr) 2016-05-11

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