EP3018337B1 - Fuel injector - Google Patents

Fuel injector 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
injector
housing
fuel injector
support
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)
French (fr)
Other versions
EP3018337A1 (en
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
Priority to DE102014222811.5A priority Critical patent/DE102014222811A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3018337A1 publication Critical patent/EP3018337A1/en
Application granted granted Critical
Publication of EP3018337B1 publication Critical patent/EP3018337B1/en
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

Description

    State of the art
  • 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. In the case of the known fuel injector, 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. In particular, 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. With an increase in 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.
  • During operation of the internal combustion engine, 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.
    From the EP 2 918 819 A1 In addition, a fuel injector is known in which a pressure sensor is screwed by means of a biasing plate against the injector body.
  • Disclosure of the invention
  • Based on the illustrated prior art, 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. In other words, this means that in addition to the connection of the sensor element via the adhesive connection, the sensor element is subjected to force in the direction of the deformation region by means of the mentioned support means such that even with a decrease or failure of the adhesive bond via the support means contacting or conditioning of the sensor element is achieved at the deformation area. Preferably, 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. According to the invention, 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.
  • Advantageous developments of the fuel injector according to the invention are given in the dependent claims.
  • In structurally preferred embodiment of the support means, it is provided that 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.
  • In structurally preferred implementation of the support means, 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. Such 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.
    It is very particularly preferred if 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.
    Moreover, it is very particularly preferred if 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. When using an example a round Cross-section having piezoelectric element as a sensor element, it may be provided that the support means is supported on the piezoelectric element via an annular portion which is flush with the outer periphery of the piezoelectric element. As a result, the particular advantage is achieved that the central region of the sensor element is not arranged in operative connection with the support means. 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 greatest 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.
  • In particular, when using a piezoelectric element as a sensor element this is usually contacted electrically on the opposite end surface of the adhesive bond. To realize a particularly simple and reliable contacting of the sensor element, it is provided that rigidly arranged plug elements for electrically contacting the sensor element are provided on the housing, and that the plug elements by means of elastically arranged contact elements in electrical operative connection with the sensor element, in particular with the adhesive connection opposite Side of the sensor element, are arranged or connected. This makes it possible that in a deformation or movement of the sensor element, for example, in its central region despite the housing rigidly arranged electrical connector elements, the electrical contact with the surface of the sensor element is made possible, although the distance between the surface of the sensor element to the rigid arranged connector elements on the housing changes.
  • In addition, it is particularly preferred if the housing is cup-shaped and seals the sensor element against the environment media-tight. As a result, in particular 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.
  • Particularly preferred is the arrangement of the deformation region in the region of the supply bore or a branch arranged in operative connection with the supply bore. 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. As a result, in particular, the connection between the addressed components thermally relatively little claimed. When using a branch beyond the particular advantage is achieved that despite the combustion chamber distant arrangement of the sensor element can be arranged at almost any location in the circumferential direction of the injector.
  • In addition, 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.
  • Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing.
  • This shows in:
  • Fig. 1
    a greatly simplified, partially sectioned side view of a fuel injector according to the invention with a measuring device for at least indirectly detecting the fuel pressure in the fuel injector,
    Fig. 2
    a first support means according to the invention, which is arranged in operative connection with a sensor element, in the region of the connection point to the injector in a partially cut representation and
    Fig. 3
    one opposite Fig. 2 modified support device, also in partially cut representation.
  • The same elements or elements with the same function are provided in the figures with the same reference numerals.
  • 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. In the illustrated, lowered position of the nozzle needle 16, 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. 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 (system 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).
  • In one of the injection openings 12 and the combustion chamber 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. In addition, it is mentioned that instead of a blind hole-shaped 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. On the side facing away from the recess 24 of the injector 11, the injector 11 is arranged for example in operative connection with a branch 28, which in turn opens into the supply hole 19. As a result, 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. Because the wall thickness of the injector housing 11 is reduced in the region of 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.
  • 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
  • The in the Fig. 3 shown 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. On the side facing away from the piezoelectric element 31 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. On the side of the plug elements 45, 46 facing the piezoelectric element 31, these are connected to the surface of the piezoelement 31 via 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).
  • During operation of the fuel injector 10, 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. Fuel injector (10), in particular common rail injector, having an injector housing (11) in which a high pressure space (15) is formed which can be supplied with pressurized fuel via a supply bore (19) which is arranged in the injector housing (11), having at least one injection opening (12) which is connected at least indirectly to the high pressure space (15), said injection opening (12) being formed in the injector housing (11) and has the purpose of injecting fuel into the combustion chamber of an internal combustion engine, having an injection element (16) which opens or closes at least one injection opening (12), and having a measuring device (30) for at least indirectly detecting the pressure in the high pressure space (15) or the supply bore (19), wherein the measuring device (35) is designed to detect elastic deformation of a deformation region (27) which is arranged at least indirectly in an operative connection to the supply bore (19) or the high pressure space (15), and wherein the measuring device (30) has a sensor element (32) which is connected to the surface of the deformation region (27) via a bonded connection (34),
    characterized
    in that forces are applied to the sensor element (32) in the direction of the deformation region (27) by means of a support device (35; 40), wherein the support device (35; 40) is supported on the side of the sensor element (32) facing away from the bonded connection (34) on the sensor element (32) via an elastic intermediate element (38).
  2. Fuel injector according to Claim 1,
    characterized
    in that the support device (35; 40) is rigidly connected to the injector housing (11).
  3. Fuel injector according to Claim 1,
    characterized
    in that the support device (35; 40) has a housing (41) which is preferably composed of metal and is connected to the injector housing (11) by means of a welded connection (39), preferably by means of a laser weld seam.
  4. Fuel injector according to one of Claims 1 to 3,
    characterized
    in that the sensor element (32) is embodied as a piezoelement (31, 31a).
  5. Fuel injector according to one of Claims 1 to 4,
    characterized
    in that the support device (35; 40) is arranged only in a subregion (37) of the sensor element (32), preferably in a subregion (37) of the sensor element (32) which circulates around the edge, in an operative connection to the sensor element (32).
  6. Fuel injector according to one of Claims 3 to 5,
    characterized
    in that plug elements (45, 46) which are rigidly arranged on the housing (41) are provided for forming the electrical contact with the sensor element (32), and in that, by means of elastically arranged contact elements (47, 48), the plug elements (45, 46) are arranged in an electrical operative connection to the sensor element (32), in particular to the side of the sensor element (32) lying opposite the bonded connection (34).
  7. Fuel injector according to one of Claims 3 to 6,
    characterized
    in that the housing (41) is embodied in a beaker shape and seals the sensor element (32) with respect to the surroundings in a media-tight fashion.
  8. Fuel injector according to one of Claims 1 to 7,
    characterized
    in that the deformation region (27) is arranged in the region of a blind-hole-shaped depression (24) or a flattened portion of the injector housing (11).
  9. Fuel injector according to one of Claims 1 to 8,
    characterized
    in that
    the deformation region (27) is arranged in the region of the supply bore (19) or of a branch (28) which is arranged in an operative connection to the supply bore (19) .
EP15190124.6A 2014-11-07 2015-10-16 Fuel injector Active EP3018337B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102014222811.5A DE102014222811A1 (en) 2014-11-07 2014-11-07 Fuel injector

Publications (2)

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

Family

ID=54359795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15190124.6A Active EP3018337B1 (en) 2014-11-07 2015-10-16 Fuel injector

Country Status (2)

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

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015206032A1 (en) 2015-04-02 2016-10-06 Robert Bosch Gmbh Fuel injector and method of manufacturing a fuel injector
DE102015208069A1 (en) 2015-04-30 2016-11-03 Robert Bosch Gmbh Fuel injector
EP3088729B1 (en) * 2015-04-30 2018-07-04 Robert Bosch Gmbh Fuel injector and device and method for assembly of a measuring device
DE102015223902A1 (en) 2015-12-01 2017-06-01 Robert Bosch Gmbh Sensor device and fuel injector with a sensor device
DE102015225047A1 (en) 2015-12-14 2017-06-14 Robert Bosch Gmbh Sensor device and fuel injector with a sensor device
DE102016204801A1 (en) * 2016-03-23 2017-09-28 Robert Bosch Gmbh Fuel injector
DE102017209560A1 (en) 2017-06-07 2018-12-13 Robert Bosch Gmbh Fuel injector
WO2020144194A1 (en) * 2019-01-10 2020-07-16 Robert Bosch Gmbh Fuel injector

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5383132B2 (en) * 2008-03-28 2014-01-08 株式会社デンソー Fuel pressure sensor mounting structure, fuel pressure detection system, fuel injection device, pressure detection device and pressure accumulation fuel injection device system used therefor
DE102014204629A1 (en) * 2014-03-13 2015-09-17 Robert Bosch Gmbh Fuel injector, in particular common rail injector
DE102014204746A1 (en) * 2014-03-14 2015-09-17 Robert Bosch Gmbh Fuel injector, in particular common rail injector
DE102014209330A1 (en) 2014-05-16 2015-11-19 Robert Bosch Gmbh Device for detecting the fuel pressure for a fuel injector, fuel injector and fuel supply line to a fuel injector

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
EP3018337A1 (en) 2016-05-11
DE102014222811A1 (en) 2016-05-12

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