EP3076001B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP3076001B1
EP3076001B1 EP16158236.6A EP16158236A EP3076001B1 EP 3076001 B1 EP3076001 B1 EP 3076001B1 EP 16158236 A EP16158236 A EP 16158236A EP 3076001 B1 EP3076001 B1 EP 3076001B1
Authority
EP
European Patent Office
Prior art keywords
sensor element
casting compound
injector housing
injection
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
EP16158236.6A
Other languages
German (de)
English (en)
Other versions
EP3076001A1 (fr
Inventor
Reinhold Melcher
Peter Cromme
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 EP3076001A1 publication Critical patent/EP3076001A1/fr
Application granted granted Critical
Publication of EP3076001B1 publication Critical patent/EP3076001B1/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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • Such a fuel injector is from the post-published DE 10 2014 209 330 A1 known to the applicant.
  • the sensor element of a measuring device is arranged in a recess in the injector housing.
  • the sensor element designed as a piezo element for example, the closing time of a nozzle needle can be detected in order to optimize the control of the fuel injector.
  • the known sensor element is connected to the recess by means of an adhesive connection and moreover has electrical connection lines which are connected to the sensor element.
  • the area of the adhesive connection between the injector housing and the sensor element represents an area to be protected, which must be protected against the ingress of media, which can otherwise reduce the durability of the adhesive connection, particularly when viewed over the service life of the fuel injector.
  • the object of the invention is to protect the sensor element connected to the surface of the injector housing by means of an adhesive connection in the simplest possible manner against the access of media which impair functionality and durability.
  • the measuring device is covered at least in regions with a protective device that prevents the access of media to the sensor element, that the protective device is designed as a potting compound or as a plastic encapsulation, and that the potting compound or plastic encapsulation is arranged on the side facing away from the sensor element in direct operative connection with the external environment or is surrounded by a cover element which is arranged on the side facing away from the sensor element in direct operative connection with the external environment.
  • a casting compound or a plastic encapsulation which protects the sensor element from the influence of, in particular, aggressive media (gases and liquids).
  • a potting compound means a relatively low outlay in terms of device technology, in particular if the potting compound or the sensor element is arranged, for example, in a recess or recess in the injector housing. This means that no additional mechanical components or constructions are required, which usually require additional manufacturing or assembly effort. Rather, in the simplest case, the protective device is formed solely by the casting compound or the plastic encapsulation.
  • the fuel injector in which the potting compound is connected to the sensor element in such a way that a pressure stress acting in the direction of the sensor element in the manner of a pretensioning force is generated by the potting compound or the plastic encapsulation.
  • Such an arrangement can be achieved, for example, if the potting compound or the plastic encapsulation is applied to the sensor element with a specific injection pressure, the potting compound or the plastic encapsulation simultaneously contributing via its connection to the injector housing to the transmission of corresponding compressive stresses to the sensor element.
  • Such an embodiment with compressive stresses acting on the sensor element is particularly advantageous because it is known that the piezoceramics usually used in the sensor element are very sensitive to internal mechanical tensile stresses, which can destroy the ceramic.
  • the compressive stresses provided according to the invention therefore counteract or overcompensate tensile stresses that may or may not exist, so that a particularly high reliability of the sensor element, in particular over the entire operating life of the fuel injector, can be achieved.
  • the potting compound In a preferred embodiment of the potting compound, it is designed as an elastomer, preferably containing silicone.
  • the sensor element is arranged in a recess in the injector housing.
  • this enables particularly good connection and mechanical protection of the casting compound to be achieved within the depression, and on the other hand the sensor element itself is also arranged in a relatively well protected manner.
  • the potting compound or the plastic encapsulation does not protrude the height of the recess.
  • the potting compound or the plastic encapsulation may project above the recess in height and to be connected to the surface of the injector housing outside the recess. Such an arrangement enables improved transmission or the generation of particularly high compressive stresses to the sensor element through an enlarged connecting area of the sealing compound or the plastic encapsulation with the injector housing.
  • the cover element is connected to a region of the injector housing which delimits the depression, preferably by means of laser beam welding.
  • the potting compound or the plastic encapsulation covers the sensor element on the end face facing away from the injector housing and in the circumferential direction.
  • Fuel injector 10 shown in a highly simplified manner, 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 injector housing 11 consisting essentially of metal, possibly of multiple parts, in which at least one, preferably a plurality of injection openings 12 for injecting the fuel are arranged on the side facing the combustion chamber of the internal combustion engine.
  • this forms a high-pressure chamber 15, in which a nozzle needle 16 serving as an injection element is arranged in a direction of movement in the direction of the double arrow 17.
  • a nozzle needle 16 serving as an injection element is arranged in a direction of movement in the direction of the double arrow 17.
  • this forms a sealing seat together with the inner wall of the high-pressure chamber 15 or the injector housing 11, so that the injection openings 12 are at least indirectly closed, such that the injection of fuel from the high-pressure chamber 15 into the Combustion chamber of the internal combustion engine is avoided.
  • the nozzle needle 16 In the other, not shown, position of the nozzle needle 16, which is lifted from the sealing seat, the latter opens 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 to open the injection openings 12, takes place in a manner known per se by means of an actuator, not shown, which can be controlled by a control device of the internal combustion engine via a voltage supply line 18.
  • the actuator can in particular be a magnetic actuator or else a piezo actuator.
  • the high-pressure chamber 15 is supplied with fuel under high pressure (system pressure) via a supply bore 19 arranged inside the injector housing 11 or formed in components of the fuel injector 10, which is in particular eccentric to the longitudinal axis 21 of the injector housing 11 in an edge region of the fuel injector 10, at least in the Runs essentially parallel to the longitudinal axis 21.
  • the supply bore 19 is also connected via a fuel connection piece, not shown, to a fuel line 22, which in turn is coupled to a fuel reservoir 25 (rail).
  • a blind hole-shaped depression 24 is formed in the outer wall 23 thereof, so that the wall thickness of the injector housing 11 is reduced in the region of the depression 24.
  • the injector housing 11 can also have a flattened area, in the area of which the wall thickness of the injector housing 11 is reduced.
  • the flat base 26 of the recess 24 forms part of a deformation region 27.
  • 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 side facing the depression 24 as a deformation region 27 in the manner of an elastically deformable membrane, the deformation, which is formed as a curvature, The greater the instantaneous fuel pressure in the supply bore 19, the greater.
  • the fuel injector 10 has a measuring device 30 for detecting the time profile of the fuel pressure in the supply bore 19 and thus also in the high-pressure chamber 15, which is used as an indication of the current position of the nozzle needle 16 for actuating the nozzle needle 16.
  • the measuring device 30 comprises a sensor element 32 designed as a piezo element 31, for example.
  • the electrode layers of the piezo element 31, which are not shown in detail in the figures, are connected to connecting lines 33, 34, which in turn generate voltage signals that can be evaluated by a circuit (not shown) when the deformation region 27 is deformed.
  • the essentially cylindrical or plate-shaped piezo element 31 is connected to the base 26 of the recess 24 via an adhesive connection 35.
  • the adhesive connection 35 in the form of an adhesive layer is designed such that, on the one hand, a secure attachment of the piezo element 31 to the injector housing 11 is made possible, and on the other hand, deformations of the deformation region 27 are transmitted to the piezo element 31.
  • the piezo element 31 is covered on its end face 36 facing away from the base 26 or the injector housing 11, as well as in the area of its circumferential surface 37 over the entire area by a casting compound 40 (alternatively a plastic encapsulation).
  • the potting compound 40 is arranged in direct operative connection with the environment, ie that it is exposed.
  • the potting compound 40 is in particular an elastomer, preferably containing silicone. At the in the Fig. 2 In the illustrated embodiment, the potting compound 40 does not quite reach the circumference of the recess 24.
  • the potting compound 40 not only surrounds the piezo element 31, but also serves to guide and protect the connecting lines 33, 34, which are also surrounded in regions by the potting compound 40.
  • the one in the Fig. 2 The illustrated exemplary embodiment aligns the upper side 41 of the potting compound 40 approximately with the outer wall 23 of the injector housing 11, which means that the potting compound 40 does not protrude the height of the recess 24.
  • the potting compound 40 is applied in operative connection with the piezo element 31 and the area of the base 26 of the depression 24 such that a pressure force F or compressive stress acting on the base 26 of the depression 24 acts on the potting compound 40 Piezo element 31 is generated.
  • the sealing compound 40a projects above the recess 24 in height and is with the outer wall 23 of the injector housing 11 is connected to the edge region delimiting the recess 24.
  • Last is in the Fig. 4 an embodiment of the invention shown, which differs essentially from the embodiment of the 2 and 3 differs in that the upper side 41 of the casting compound 40 facing away from the piezo element 31 is covered by a deep-drawn cover element 45, for example made of sheet metal, which has openings 46, 47 for the passage of the connecting lines 33, 34.
  • the cover element or cup-shaped cover element 45 is connected to the outer wall 23 of the injector housing 11 by a circumferential flange region 48, preferably by means of a laser weld seam 49, and is otherwise operatively connected to the surroundings of the fuel injector 10.
  • the covering element 45 which completely covers the recess 24, is filled in its interior by the casting compound 40c.
  • the cover element 45 can be attached to the injector housing 11 either after the application or arrangement of the casting compound 40c, or else in advance, the casting compound 40c being introduced into the area covered by the cover element 45 through an opening (not shown) in the cover element 45.
  • Such an embodiment also has the particular advantage that the injection of the elastomer into the area covered by the cover element 45 can take place under increased pressure, so that an additional compressive stress can be generated by the cover element 45 on the potting compound 40c, which in turn affects the Piezo element 31 is transmitted.
  • the fuel injector 10 described so far can be modified or modified in a variety of ways without deviating from the inventive concept.

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  • 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)

Claims (6)

  1. Injecteur de carburant (10), notamment injecteur à rampe de distribution commune, comprenant un boîtier d'injecteur (11) dans lequel est formé un espace de haute pression (15) qui peut être alimenté en carburant sous pression par le biais d'un trou d'alimentation (19) disposé dans le boîtier d'injecteur (11), comprenant au moins une ouverture d'injection (12) formée dans le boîtier d'injecteur (11) et reliée au moins indirectement à l'espace de haute pression (15), destinée à injecter du carburant dans la chambre de combustion d'un moteur à combustion interne, comprenant au moins un organe d'injection (16) qui libère ou qui ferme l'ouverture d'injection (12), et comprenant un dispositif de mesure (30) destiné à détecter au moins indirectement la pression dans l'espace de haute pression (15) ou le trou d'alimentation (19), le dispositif de mesure (30) étant configuré pour détecter une déformation élastique d'une zone de déformation (27) disposée en liaison fonctionnelle au moins indirectement avec le trou d'alimentation (19) ou l'espace de haute pression (15), et le dispositif de mesure (30) possédant un élément capteur (32) qui est relié à la surface de la zone de déformation (27) par le biais d'une liaison collée (35), le dispositif de mesure (30) étant recouvert au moins dans certaines zones par un dispositif de protection, et le dispositif de protection étant réalisé sous la forme d'une masse de scellement (40 ; 40a ; 40c) ou d'enrobage en matière plastique,
    caractérisé en ce que
    la masse de scellement (40 ; 40a ; 40c) ou l'enrobage en matière plastique est disposé(e) sur le côté opposé à l'élément capteur (32) en liaison fonctionnelle directe avec l'environnement ou est entouré(e) d'un élément de recouvrement (45) qui est disposé sur le côté opposé à l'élément capteur (32) en liaison fonctionnelle directe avec l'environnement, la masse de scellement (40 ; 40a ; 40c) ou l'enrobage en matière plastique étant relié(e) à l'élément capteur (32) de telle sorte qu'une force de pression (F) ou une contrainte de pression agissant en direction de l'élément capteur (32) est générée par la masse de scellement (40 ; 40a ; 40c) ou l'enrobage en matière plastique, la masse de scellement (40 ; 40a ; 40c) ou l'enrobage en matière plastique recouvrant l'élément capteur (32) sur la face frontale (36) à l'opposé du boîtier d'injecteur (11) ainsi qu'au niveau de sa surface périphérique (37).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que la masse de scellement (40 ; 40a ; 40c) est un élastomère, de préférence contenant du silicone.
  3. Injecteur de carburant selon l'une des revendications 1 à 2, caractérisé en ce que l'élément capteur (32) est disposé dans une cavité (24) du boîtier d'injecteur (11).
  4. Injecteur de carburant selon la revendication 3, caractérisé en ce que la masse de scellement (40) ou l'enrobage en matière plastique ne fait pas saillie hors de la cavité (24) en hauteur.
  5. Injecteur de carburant selon la revendication 3, caractérisé en ce que la masse de scellement (40a) ou l'enrobage en matière plastique fait saillie hors de la cavité (24) en hauteur et est relié au boîtier d'injecteur (11) en dehors de la cavité (24).
  6. Injecteur de carburant selon l'une des revendications 3 à 5, caractérisé en ce que l'élément de recouvrement (45) est relié à une zone du boîtier d'injecteur (11) qui délimite la cavité (24), de préférence par un cordon de soudage par faisceau laser (49) .
EP16158236.6A 2015-04-02 2016-03-02 Injecteur de carburant Active EP3076001B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015206023.3A DE102015206023A1 (de) 2015-04-02 2015-04-02 Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP3076001A1 EP3076001A1 (fr) 2016-10-05
EP3076001B1 true EP3076001B1 (fr) 2020-07-08

Family

ID=55451112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16158236.6A Active EP3076001B1 (fr) 2015-04-02 2016-03-02 Injecteur de carburant

Country Status (2)

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EP (1) EP3076001B1 (fr)
DE (1) DE102015206023A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015224709A1 (de) * 2015-12-09 2017-06-14 Robert Bosch Gmbh Kraftstoffinjektor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3018339A1 (fr) * 2014-11-07 2016-05-11 Robert Bosch Gmbh Injecteur
EP3018337A1 (fr) * 2014-11-07 2016-05-11 Robert Bosch Gmbh Injecteur de carburant

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4775816A (en) * 1987-11-09 1988-10-04 Stanadyne, Inc. Piezoelectric sensor
US5575264A (en) * 1995-12-22 1996-11-19 Siemens Automotive Corporation Using EEPROM technology in carrying performance data with a fuel injector
JP4419847B2 (ja) * 2004-09-16 2010-02-24 株式会社デンソー 圧力センサ
JP5079650B2 (ja) * 2007-11-02 2012-11-21 株式会社デンソー 燃料噴射弁及び燃料噴射装置
DE102012221084A1 (de) * 2012-11-19 2014-05-22 Robert Bosch Gmbh Drucksensor und Komponente einer Brennstoffeinspritzanlage mit einem Drucksensor
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
DE102015201970A1 (de) 2015-02-04 2016-08-04 Robert Bosch Gmbh Bauteileverbund, Verfahren zum Herstellen eines Bauteileverbunds und Kraftstoffinjektor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3018339A1 (fr) * 2014-11-07 2016-05-11 Robert Bosch Gmbh Injecteur
EP3018337A1 (fr) * 2014-11-07 2016-05-11 Robert Bosch Gmbh Injecteur de carburant

Also Published As

Publication number Publication date
EP3076001A1 (fr) 2016-10-05
DE102015206023A1 (de) 2016-10-06

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