EP3076001A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP3076001A1
EP3076001A1 EP16158236.6A EP16158236A EP3076001A1 EP 3076001 A1 EP3076001 A1 EP 3076001A1 EP 16158236 A EP16158236 A EP 16158236A EP 3076001 A1 EP3076001 A1 EP 3076001A1
Authority
EP
European Patent Office
Prior art keywords
sensor element
injector
fuel injector
fuel
potting compound
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
EP16158236.6A
Other languages
German (de)
English (en)
Other versions
EP3076001B1 (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
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 EP3076001A1 publication Critical patent/EP3076001A1/fr
Application granted granted Critical
Publication of EP3076001B1 publication Critical patent/EP3076001B1/fr
Active legal-status Critical Current
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
    • 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 the applicant known.
  • the known fuel injector it is provided to arrange the sensor element of a measuring device in a recess of the injector.
  • the sensor element embodied as a piezoelectric element, for example, the closing time of a nozzle needle can be detected in order to optimize the activation of the fuel injector.
  • the known sensor element is connected by means of an adhesive connection with the recess and also has electrical connection lines which are connected to the sensor element.
  • the area of the adhesive bond between the injector housing and the sensor element constitutes an area to be protected, which must be protected from the ingress of media which may otherwise reduce the durability of the adhesive bond, particularly over the life of the fuel injector.
  • media-sensitive components in the region of an interface between metallic materials and a plastic extrusion, as they occur, for example, in a component composite formed as a fuel injector, technically complex.
  • a component composite formed as a fuel injector technically complex.
  • the background for these measures is the imperfect sealing between an element made of metallic material and plastic, which manifests itself for example by creeping gaps as well as the non-adherence of components.
  • the present invention seeks to protect the connected to the surface of the injector via an adhesive connection sensor element in the simplest possible way against the access of the functionality and durability impairing media.
  • a fuel injector with the features of claim 1, characterized in that the measuring device is covered with a protective device at least partially, which 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 extrusion on the side remote from the sensor element is arranged 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 potting compound or a Kunststoffumspritzung that protects the sensor element from the influence of particular aggressive media (gases and liquids).
  • a potting compound means a relatively small outlay in terms of apparatus, in particular if the potting compound or the sensor element is arranged, for example, in a recess or recess of the injector housing.
  • the protective device is formed in the simplest case alone by the potting compound or the Kunststoffumspritzung.
  • An embodiment of the fuel injector in which the potting compound is connected to the sensor element in such a way that a compressive stress acting in the direction of the sensor element in the manner of a prestressing force is generated by the potting compound or the plastic extrusion.
  • 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 for transmitting corresponding compressive stresses to the sensor element.
  • Such an embodiment with compressive stresses acting on the sensor element is particularly advantageous, since it is known that the piezoceramics commonly used in the sensor element are very sensitive to internal mechanical tensile stresses, which can lead to the destruction of the ceramic.
  • the compressive stresses provided according to the invention therefore counteract or overcompensate any tensile stresses which may or may not be present, so that a particularly high reliability of the sensor element, in particular over the entire service life of the fuel injector, can be achieved.
  • this is formed as an elastomer, preferably containing silicone.
  • the sensor element is arranged in a recess of the injector housing. This makes it possible, on the one hand, to achieve a particularly good connection and mechanical protection of the potting compound within the depression, and, on the other hand, the sensor element itself is also arranged mechanically relatively well protected.
  • the potting compound or the plastic encapsulation does not project beyond the recess in height.
  • the potting compound or the plastic encapsulation may project beyond the recess and to be connected outside the recess to the surface of the injector housing.
  • Such an arrangement allows an improved transmission or the generation of particularly high compressive stresses on the sensor element by an enlarged connection surface of the potting compound or the plastic encapsulation with the injector.
  • the cover element when using a cover element, it can be provided that the cover element is connected to a region of the injector housing bounding the recess, preferably by laser beam welding.
  • the most complete or comprehensive protection possible of the sensor element is achieved when 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. As a result, in particular the access of media in the region of the adhesive connection is particularly effectively suppressed or prevented.
  • 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 injector housing 11, which consists essentially of metal and may have a multi-part design, in which at least one, preferably several 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 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 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 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 higher the instantaneous fuel pressure in the supply bore 19 is.
  • the fuel injector 10 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 instantaneous position of the nozzle needle 16 for driving the nozzle needle 16, the fuel injector 10 has a measuring device 30.
  • the measuring device 30 comprises a sensor element 32 designed by way of example as a piezoelement 31.
  • the electrode layers of the piezoelectric element 31, which are not shown in detail in the figures, are connected to connecting leads 33, 34 which, in turn, generate voltage signals which can be evaluated by a circuit, not shown, upon deformation of the deformation region 27.
  • the substantially cylindrical or plate-shaped piezoelectric element 31 is connected to the bottom 26 of the recess 24 via an adhesive connection 35.
  • the adhesive bond 35 in the form of an adhesive layer is designed such that, on the one hand, secure attachment of the piezoelectric element 31 to the injector housing 11 is made possible, and, on the other hand, deformations of the deformation region 27 are transferred to the piezoelectric element 31.
  • the piezoelectric element 31 is on both its base 26 and the injector 11 facing away from the end face 36, as well as in the area of its peripheral surface 37 over the entire surface of a potting compound 40 (alternatively a plastic extrusion) covered.
  • 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. In the in the Fig. 2 illustrated embodiment, the potting compound 40 does not reach all the way to the periphery of the recess 24 zoom.
  • the potting compound 40 not only surrounds the piezoelectric element 31, but also serves to guide or protect the connection lines 33, 34, which are also partially surrounded by the potting compound 40.
  • the top 41 of the potting compound 40 is aligned approximately with the outer wall 23 of the injector housing 11, which means that the potting compound 40 does not protrude beyond the recess 24 in height.
  • the potting compound 40 is applied in operative connection with the piezo element 31 and the region of the bottom 26 of the recess 24, that of the potting compound 40 acting in the direction of the bottom 26 of the recess 24 compressive force F or compressive stress on the Piezo element 31 is generated.
  • the potting compound 40a projects beyond the recess 24 in height and is connected to the outer wall 23 of the injector 11 connected to the recess 24 delimiting edge region.
  • Fig. 4 an embodiment of the invention shown, which is essentially derived from the embodiment of the FIGS. 2 and 3 differs in that the piezoelectric element 31 facing away from the top 41 of the potting compound 40 is covered by an existing example of sheet metal and deep-drawn cover 45, the openings 46, 47 for passing through the connecting lines 33, 34 has.
  • the lid-shaped or cup-shaped cover member 45 is connected to a peripherally encircling flange 48 with the outer wall 23 of the injector 11, preferably by a laser weld 49 and is otherwise arranged in operative connection with the environment of the fuel injector 10.
  • the recess 24 completely covering cover 45 is filled in its interior by the potting compound 40c.
  • the attachment of the cover 45 on the injector 11 can be done either after the application or placement of the potting compound 40c, or in advance, is introduced through an unillustrated opening in the cover 45, the potting compound 40c in the area covered by the cover 45 area.
  • Such an embodiment also has the particular advantage that the injection of the elastomer in the area covered by the cover 45 can take place under elevated pressure so that an additional compressive stress can be generated via the cover 45 on the potting compound 40c, which in turn on the Piezo element 31 is transmitted.

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)
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 true EP3076001A1 (fr) 2016-10-05
EP3076001B1 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)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3179090A1 (fr) * 2015-12-09 2017-06-14 Robert Bosch Gmbh Injecteur de carburant

Citations (6)

* 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
US20060053894A1 (en) * 2004-09-16 2006-03-16 Denso Corporation Pressure sensor
EP2216540A1 (fr) * 2007-11-02 2010-08-11 Denso Corporation Soupape et dispositif d'injection de carburant
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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014222811A1 (de) * 2014-11-07 2016-05-12 Robert Bosch Gmbh Kraftstoffinjektor
DE102014222796A1 (de) * 2014-11-07 2016-05-12 Robert Bosch Gmbh Injektor
DE102015201970A1 (de) 2015-02-04 2016-08-04 Robert Bosch Gmbh Bauteileverbund, Verfahren zum Herstellen eines Bauteileverbunds und Kraftstoffinjektor

Patent Citations (6)

* 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
US20060053894A1 (en) * 2004-09-16 2006-03-16 Denso Corporation Pressure sensor
EP2216540A1 (fr) * 2007-11-02 2010-08-11 Denso Corporation Soupape et dispositif d'injection de carburant
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3179090A1 (fr) * 2015-12-09 2017-06-14 Robert Bosch Gmbh Injecteur de carburant

Also Published As

Publication number Publication date
DE102015206023A1 (de) 2016-10-06
EP3076001B1 (fr) 2020-07-08

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