EP3018337A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP3018337A1
EP3018337A1 EP15190124.6A EP15190124A EP3018337A1 EP 3018337 A1 EP3018337 A1 EP 3018337A1 EP 15190124 A EP15190124 A EP 15190124A EP 3018337 A1 EP3018337 A1 EP 3018337A1
Authority
EP
European Patent Office
Prior art keywords
sensor element
housing
fuel injector
injector
region
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
EP15190124.6A
Other languages
German (de)
English (en)
Other versions
EP3018337B1 (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
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3018337A1 publication Critical patent/EP3018337A1/fr
Application granted granted Critical
Publication of EP3018337B1 publication Critical patent/EP3018337B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00Fuel-injectors combined or associated with other devices
    • F02M57/005Fuel-injectors combined or associated with other devices the devices being sensors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24Fuel-injection apparatus with sensors
    • F02M2200/247Pressure sensors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8038Fuel injection apparatus manufacture, repair or assembly the assembly involving use of adhesives, glue or the like
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084Fuel injection apparatus manufacture, repair or assembly involving welding or soldering

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 in the known fuel injector by means of an adhesive bond with the deformation region and adapted to detect occurring in the contact region to the injector housing strains or tensile stresses, the size or height of the strains depending 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 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.
  • 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 means is rigidly connected to the injector. Due to the rigid connection of the support device with the injector housing in particular the required acting on the sensor element support force is generated.
  • the support device may be supported on the sensor element on the side of the sensor element facing away from the adhesive connection via an elastic intermediate 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 senor element is designed as a piezoelectric element.
  • 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.
  • This in turn, has the advantage that, in the case of a deformation of the deformation region, the central region of the deformation region, which is arranged in overlap with the sensor element or the piezoelectric element and which experiences a maximum deflection relative to a rest position, is not arranged in operative connection with the support device. This in turn favors the accuracy or resolution of the sensor element and thus the accuracy of the measurement results.
  • 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 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.
  • 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).
  • a blind hole-shaped recess 24 is formed, 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 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 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 piezo 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 has 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 outward 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 deviating from the idea of the invention, in particular the shape or structure of the piezoelectric element 31, 31a may deviate from the illustrated embodiments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
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 true EP3018337A1 (fr) 2016-05-11
EP3018337B1 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)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3088729A1 (fr) * 2015-04-30 2016-11-02 Robert Bosch Gmbh Injecteur de carburant et dispositif et procede de montage d'un dispositif de mesure
EP3222844A1 (fr) * 2016-03-23 2017-09-27 Robert Bosch GmbH Injecteur de carburant
EP3076001B1 (fr) * 2015-04-02 2020-07-08 Robert Bosch GmbH Injecteur de carburant

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015206032A1 (de) 2015-04-02 2016-10-06 Robert Bosch Gmbh Kraftstoffinjektor und Verfahren zum Herstellen eines Kraftstoffinjektors
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
DE102017209560A1 (de) 2017-06-07 2018-12-13 Robert Bosch Gmbh Kraftstoffinjektor
DE102019200232A1 (de) * 2019-01-10 2020-07-16 Robert Bosch Gmbh Kraftstoffinjektor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2105602A2 (fr) * 2008-03-28 2009-09-30 Denso Corporation Capteur de pression de carburant/assemblage de capteur, appareil d'injection de carburant, et appareil de détection de pression
EP2918820A1 (fr) * 2014-03-14 2015-09-16 Robert Bosch Gmbh Injecteur de carburant, notamment injecteur à rampe commune
EP2918819A1 (fr) * 2014-03-13 2015-09-16 Robert Bosch Gmbh Injecteur de carburant, notamment injecteur à rampe commune

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2105602A2 (fr) * 2008-03-28 2009-09-30 Denso Corporation Capteur de pression de carburant/assemblage de capteur, appareil d'injection de carburant, et appareil de détection de pression
EP2918819A1 (fr) * 2014-03-13 2015-09-16 Robert Bosch Gmbh Injecteur de carburant, notamment injecteur à rampe commune
EP2918820A1 (fr) * 2014-03-14 2015-09-16 Robert Bosch Gmbh Injecteur de carburant, notamment injecteur à rampe commune

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3076001B1 (fr) * 2015-04-02 2020-07-08 Robert Bosch GmbH Injecteur de carburant
EP3088729A1 (fr) * 2015-04-30 2016-11-02 Robert Bosch Gmbh Injecteur de carburant et dispositif et procede de montage d'un dispositif de mesure
EP3222844A1 (fr) * 2016-03-23 2017-09-27 Robert Bosch GmbH Injecteur de carburant

Also Published As

Publication number Publication date
DE102014222811A1 (de) 2016-05-12
EP3018337B1 (fr) 2018-03-14

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