EP2944799B1 - Dispositif de détection de la pression de carburant pour un injecteur de carburant, injecteur de carburant et conduite d'amenée de carburant vers un injecteur de carburant - Google Patents

Dispositif de détection de la pression de carburant pour un injecteur de carburant, injecteur de carburant et conduite d'amenée de carburant vers un injecteur de carburant Download PDF

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Publication number
EP2944799B1
EP2944799B1 EP15163236.1A EP15163236A EP2944799B1 EP 2944799 B1 EP2944799 B1 EP 2944799B1 EP 15163236 A EP15163236 A EP 15163236A EP 2944799 B1 EP2944799 B1 EP 2944799B1
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EP
European Patent Office
Prior art keywords
fuel
pressure
injector
fuel injector
measuring element
Prior art date
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Active
Application number
EP15163236.1A
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German (de)
English (en)
Other versions
EP2944799A1 (fr
Inventor
Avraam Meintanis
Hanna Zimmer
Holger Rapp
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
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Robert Bosch GmbH
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Filing date
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Publication of EP2944799A1 publication Critical patent/EP2944799A1/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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • 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
    • F02M65/001—Measuring fuel delivery of a fuel injector
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
    • 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

Definitions

  • the invention relates to a device for detecting the fuel pressure for a fuel injector according to the preamble of the two independent device claims. Furthermore, the invention relates to a fuel injector or a fuel supply line to a fuel injector with a device according to the invention.
  • a device according to the preamble of the independent device claim is already known from practice and comprises a piezoelectric element designed as a pressure sensor, which is arranged on an outer side of a fuel injector near a feed bore formed in the injector housing of the fuel injector.
  • the inlet bore connects a fuel supply line hydraulically coupled to the fuel injector with a high-pressure space formed inside the injector housing, in which the nozzle needle is located.
  • the known device is arranged with its measuring element in the region of a rectilinear portion of the inlet bore, wherein the wall thickness between the inlet bore and the outside of the injector, at which the measuring element designed as a piezoelectric element is formed is relatively thin.
  • a deformation occurring in the wall of the injector housing due to a compressive stress at a pressure increase in the inlet bore can be detected, which typically occurs when the nozzle needle closes the injection openings again after injecting the fuel from the high-pressure chamber into a combustion chamber of an internal combustion engine.
  • the detection of the opening or closing time of the nozzle needle makes it possible, in particular, to compensate over the life of the injector occurring quantity spreads by a corresponding corrected control of the fuel injector.
  • the piezoelectric element is pressed by means of a biasing device against the injector.
  • Such a tensioning device represents an additional constructive measure which increases the manufacturing costs of the fuel injector.
  • this increases the size of the fuel injector so that, given given installation conditions, it is usually not possible to use such a fuel injector without making structural changes to the internal combustion engine.
  • the known device is therefore particularly suitable for laboratory purposes.
  • the applicant also discloses a device for measuring the fuel pressure in a fuel injection valve, in which a radial expansion of a nozzle body is detected by means of a measuring device radially surrounding the nozzle body.
  • the measuring element designed as a measuring sleeve uses this particular strain gauges.
  • known device is usually not suitable to be used in an existing internal combustion engine, since the size of the fuel injector is increased in the region of the nozzle body.
  • the DE102010016424 discloses a fuel injector with an inlet channel in an injector housing on which a pressure sensor is arranged.
  • the DE 10 2009 000983 A1 discloses another fuel injector with a pressure sensor.
  • the invention has the object, a device for detecting the fuel pressure for a fuel injector according to the preamble of the independent claim such that it is suitable, integrated with the simplest possible effort in existing fuel injectors or at this be mounted, or to be arranged independently of the fuel injector in a fuel supply system for the fuel injector.
  • a device for detecting the fuel pressure for a fuel injector according to the preamble of the independent claim such that it is suitable, integrated with the simplest possible effort in existing fuel injectors or at this be mounted, or to be arranged independently of the fuel injector in a fuel supply system for the fuel injector.
  • the invention makes use of the idea that with an increase in pressure in a curved flow path, the fuel-carrying element tends to align itself. This effect can be exemplified by the water pressure is increased in an arcuate, exposed garden hose, whereupon the garden hose tends to reduce its curvature.
  • the hydraulic forces that lead to a reduction in the curvature of the flow path generate in the flow path for the fuel-limiting wall, a mechanical stress and thus a deformation that can be detected by means of the addressed piezoelectric element.
  • the fuel supply device prefferably be designed as an inlet channel formed in the injector housing which opens into the high-pressure chamber, for the inlet channel to have two bore sections arranged at an angle to one another, which form the flow path for the fuel, and for the measuring element to be in the transitional region is arranged between the two bore sections.
  • the measuring element is arranged on the outside of the injector housing.
  • no hydraulic seal in the region of the measuring element is required, so that this can be made relatively simple and thus inexpensive to produce.
  • no additional space is required within the injector housing to accommodate the measuring element.
  • the measuring element is connected by means of a material connection with the injector.
  • high-temperature-resistant adhesives are suitable for this purpose.
  • the measuring element is arranged in the region of a hydraulically connectable with the fuel injector fuel supply, which forms the fuel supply device.
  • This solution has the particular advantage that neither the fuel injector must be changed in terms of its size or structural design over the prior art, nor that additional installation space is required at the installation of the fuel injector in the internal combustion engine.
  • such a solution of the arrangement of the device is therefore also suitable, for example, for a subsequent or optional arrangement.
  • This basic idea of the example not according to the invention makes use of the idea that the connection between a fuel reservoir (rail) and the fuel injector takes place by means of a rigid connecting line which has sections arranged at an angle to connect the rail to the respective fuel injector.
  • the measuring element is arranged directly, possibly with the interposition of a connecting layer, on the outside of the fuel supply line.
  • This solution has in particular the Advantage that no structural changes must be made to the existing fuel supply.
  • the connection between the measuring element and the Kraftstoffzumol technisch takes place in analogy to the connection of the measuring element with the injector preferably by a cohesive connection.
  • the measuring element in the region of an insertable into the fuel supply line adapter element.
  • Such a solution has the particular advantage that the installation location or the location of the measuring element is not necessarily connected to formed in the fuel supply, in an angle or curved sections arranged. Rather, the adapter element can also be used in a straight-line section of the connecting line, wherein the adapter element is designed in this case such that the fuel is guided within the adapter element in a curved or at an angle to each other standing sections.
  • such a design has the particular advantage that the provided for detecting the pressure changes sections of the fuel guide can be specially adapted, for example, by a particularly large angle in which the fuel-carrying areas are arranged to each other to a pressure change at a particularly large voltage signal on To produce piezoelectric element.
  • the measuring element is arranged in the region of a fuel supply line which can be hydraulically connected to the fuel injector, that the measuring element is arranged in the region of an adapter element which can be inserted into the fuel supply line, and that the adapter element has a membrane which is elastically deformable by the fuel pressure has, in the region of the measuring element is arranged.
  • a design of the measuring element has the advantage of a particularly good detection of pressure fluctuations or the ability to detect even relatively small pressure fluctuations.
  • the invention also includes a fuel injector with a device according to the invention.
  • Fig. 1 is shown in a combustion chamber, not shown, a self-igniting internal combustion engine facing end portion of a fuel injector 10.
  • the fuel injector 10 serves to inject fuel into the combustion chamber of the internal combustion engine and is part of a known common rail injection system.
  • the fuel injector 10 has an injector housing 11 which by way of example, not limitation, comprises a nozzle body 12 facing the combustion chamber of the internal combustion engine and a residual housing 17 connected to the nozzle body 12 and axially connected to the nozzle body 12 with housing elements 13a, 13b ,
  • a plurality of injection openings 14 are formed in the nozzle body 12 .
  • a substantially blind-hole-shaped recess 15 is formed in the nozzle body 12, in which along a longitudinal axis 16, a nozzle needle 18 is arranged to be liftable. In the in the Fig. 1 the illustrated, lowered position of the nozzle needle 18, this closes the injection openings 14 indirectly to form a sealing seat 19 on the inside of the nozzle body 12.
  • the control chamber sleeve 22 is supported on the side facing away from the injection openings 14 with its end face on the opposite end face of the housing member 13b.
  • a control chamber 26 is limited, which is hydraulically pressure relieved via a drain hole 27 in a low pressure region of the fuel injector 10, not shown.
  • the movement of the nozzle needle 18 is controlled in a manner known per se.
  • the actuation of the valve member takes place in a likewise known manner, for example by a solenoid actuator or a piezoactuator.
  • the recess 15 in the nozzle body 12 defines a high pressure chamber 28, which is connected via an inlet channel 30 and a fuel supply line 60 with a high pressure source 31 (rail).
  • the inlet channel 30 has two Bore sections 32, 33, which are arranged at an angle ⁇ to each other. While the bore portion 32 formed in the housing member 13a is parallel to the longitudinal axis 16, the second bore portion 33 located in the housing member 13b inclines toward the high pressure space 28.
  • the control chamber 26 is hydraulically connected to the high-pressure chamber 28.
  • a radially encircling annular groove 34 is formed in the control chamber sleeve 22, which opens into the control chamber 26 via a connecting bore 35.
  • the annular groove 34 is hydraulically connected via a gap filter 36 to the high-pressure chamber 28.
  • Essential to the invention is the arrangement or design of a device 50 for detecting the fuel pressure in the inlet channel 30.
  • the device 50 designed as a piezoelectric element 51 measuring element 52 which on the outer peripheral wall of the injector 11 in the transition region between the two housing elements 13a, 13b is arranged.
  • the arrangement of the measuring element 52 is such that it is located at the level of the kink between the two bore sections 32, 33.
  • the connection of the measuring element 52 to the injector housing 11 is preferably carried out by a cohesive connection, in particular by a heat-resistant adhesive layer 54.
  • the piezoelectric element 51 is coupled via an electrically connecting line 55 with a control device, not shown, which serves at least indirectly the control of the fuel injector 10.
  • a control of the fuel injector 10 and the actuator for controlling the outflow of fuel from the control chamber 26 in causes the low pressure region of the fuel injector 10 that the prevailing in the closing direction hydraulic pressure in the control chamber 26 is reduced, whereupon the nozzle needle 28 lifts against the spring force of the closing spring 25 of the sealing seat 19.
  • fuel flows from the high-pressure chamber 28 and the injection openings 14 into the combustion chamber of the internal combustion engine.
  • fuel flows via the inlet channel 30 into the high-pressure space 28, the pressure in the inlet channel 30 being reduced compared to the closed nozzle needle 18.
  • the drainage channel 27 is closed by deactivating the actuator of the fuel injector 10.
  • a voltage signal U of the piezoelectric element 51, the pressure P within the high-pressure chamber 28 or the inlet channel 30, and a pressure signal U are detected over the time t Flow rate Q through the injection openings 14.
  • a negative voltage signal U is generated by the piezoelectric element 51.
  • the hydraulic pressure in the inlet channel 30 is substantially constant, since the fuel quantity flowing into the high-pressure chamber 28 corresponds to the amount of fuel flowing out through the injection openings 14.
  • the pressure P in the high-pressure chamber 28 or the inlet channel 30 begins to rise again to its original value, since the closing movement of the nozzle needle 18 begins at this time.
  • the associated pressure increase in the inlet channel 30 is detected by means of the piezoelectric element 51, which generates a positive voltage pulse U.
  • the device 50 is arranged between the high-pressure source 31 and the fuel injector 10 a, wherein it is essential that the device 50 is arranged separately from the fuel injector 10 a in the region of the fuel supply line 60.
  • the fuel supply line 60 has in the in the Fig. 2 illustrated embodiment, a curved trained portion 61 with a radius of curvature r.
  • the piezoelectric element 51a is connected to the portion 61 on the convex side of the portion 61 with the interposition of an adhesive layer 54a.
  • the piezoelectric element 51a is arranged in the region of an adapter element 65 interposed in the fuel supply line 60.
  • This embodiment has the advantage that the fuel guide in the region of the adapter element 65 can be adapted especially for the best possible detection of pressure fluctuations by the piezoelectric element 51a, for example by a smaller radius of curvature r or at a greater angle to each other inclined bore sections for fuel guidance.
  • Last is in the 4 and 5 an example not according to the invention is shown, in which, with the use of an adapter element 70, which is also integrated into the fuel supply line 60 to the fuel injector 10a, the piezoelectric element 51b is disposed on an outer surface of the adapter element 70.
  • the adapter element 70 has a branch 71 which is acted upon by the hydraulic pressure and which is delimited by a high-pressure membrane 72.
  • the high-pressure membrane 72 is in turn arranged in operative connection with the piezoelectric element 51b. According to the presentation of the Fig. 5 If there is an increase in pressure, a deformation or deformation of the high-pressure membrane 72 takes place, which can be detected by means of the piezoelement 51b.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (5)

  1. Dispositif (50) pour la détection d'une pression de carburant (P) pour un injecteur de carburant (10; 10a), avec un élément de mesure (52) constitué par un élément piézoélectrique (51; 51a) pour la détection de la pression de carburant (P), dans lequel l'élément de mesure (52) est configuré pour détecter une déformation d'une paroi limitant le chemin d'écoulement d'un dispositif de fourniture de carburant à une chambre à haute pression (28) formée dans le boîtier d'injecteur (11), dans lequel le dispositif de fourniture de carburant forme dans la région de l'élément de mesure (52) un chemin d'écoulement incurvé ou coudé pour le carburant,
    caractérisé en ce que le dispositif de fourniture de carburant est réalisé sous la forme d'un canal d'arrivée (30) formé dans le boîtier d'injecteur (11), qui débouche dans la chambre à haute pression (28), en ce que le canal d'arrivée (30) présente deux parties d'alésage (32, 33) disposées avec un angle (α) l'une par rapport à l'autre, qui forment le chemin d'écoulement pour le carburant, et en ce que l'élément de mesure est disposé dans la région de transition entre les deux parties d'alésage (32, 33).
  2. Dispositif selon la revendication 1, caractérisé en ce que l'élément de mesure (52) est disposé sur le côté extérieur du boîtier d'injecteur (11).
  3. Dispositif selon la revendication 2, caractérisé en ce que l'élément de mesure (52) est assemblé au boîtier d'injecteur (11) au moyen d'une liaison matérielle, en particulier au moyen d'une couche de colle (54).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'élément de mesure (52) est configuré ou est disposé de façon à détecter des déformations en raison de contraintes de compression.
  5. Injecteur de carburant (10) avec un dispositif (50) selon l'une quelconque des revendications 1 à 4.
EP15163236.1A 2014-05-16 2015-04-10 Dispositif de détection de la pression de carburant pour un injecteur de carburant, injecteur de carburant et conduite d'amenée de carburant vers un injecteur de carburant Active EP2944799B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014209330.9A DE102014209330A1 (de) 2014-05-16 2014-05-16 Vorrichtung zur Erfassung des Kraftstoffdrucks für einen Kraftstoffinjektor, Kraftstoffinjektor sowie Kraftstoffzuführleitung zu einem Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP2944799A1 EP2944799A1 (fr) 2015-11-18
EP2944799B1 true EP2944799B1 (fr) 2019-02-06

Family

ID=52814929

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EP15163236.1A Active EP2944799B1 (fr) 2014-05-16 2015-04-10 Dispositif de détection de la pression de carburant pour un injecteur de carburant, injecteur de carburant et conduite d'amenée de carburant vers un injecteur de carburant

Country Status (2)

Country Link
EP (1) EP2944799B1 (fr)
DE (1) DE102014209330A1 (fr)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014222806A1 (de) 2014-11-07 2016-05-12 Robert Bosch Gmbh Kraftstoffinjektor
DE102014222808A1 (de) 2014-11-07 2016-05-12 Robert Bosch Gmbh Kraftstoffinjektor und Verfahren zum Herstellen eines Kraftstoffinjektors
DE102014222811A1 (de) 2014-11-07 2016-05-12 Robert Bosch Gmbh Kraftstoffinjektor
DE102014223659A1 (de) 2014-11-20 2016-05-25 Robert Bosch Gmbh Kraftstoffinjektor
DE102014223661A1 (de) 2014-11-20 2016-05-25 Robert Bosch Gmbh Kraftstoffinjektor
DE102014223775A1 (de) 2014-11-21 2016-05-25 Robert Bosch Gmbh Kraftstoffinjektor
DE102015201970A1 (de) 2015-02-04 2016-08-04 Robert Bosch Gmbh Bauteileverbund, Verfahren zum Herstellen eines Bauteileverbunds und Kraftstoffinjektor
DE102015202725A1 (de) 2015-02-16 2016-08-18 Robert Bosch Gmbh Kraftstoffinjektor und Verfahren zur Herstellung eines Piezoelements für einen Kraftstoffinjektor
DE102015206023A1 (de) 2015-04-02 2016-10-06 Robert Bosch Gmbh Kraftstoffinjektor
EP3088723B1 (fr) 2015-04-30 2019-06-12 Robert Bosch Gmbh Injecteur de carburant
DE102015211186A1 (de) 2015-04-30 2016-11-03 Robert Bosch Gmbh Kraftstoffinjektor
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
DE102015208488A1 (de) 2015-04-30 2016-11-03 Robert Bosch Gmbh Kraftstoffinjektor sowie Vorrichtung und Verfahren zur Montage einer Messeinrichtung
DE102015224683A1 (de) 2015-12-09 2017-06-14 Robert Bosch Gmbh Kraftstoffinjektor
DE102015225070A1 (de) 2015-12-14 2017-06-14 Robert Bosch Gmbh Verfahren und Prüfeinrichtung zum Prüfen einer Sensoreinrichtung an einem Kraftstoffinjektor
DE102016219067A1 (de) 2016-09-30 2018-04-05 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine
GB2559798B (en) * 2017-02-20 2020-03-11 Delphi Automotive Systems Lux Fuel injector
DE102017209692A1 (de) 2017-06-08 2018-12-13 Robert Bosch Gmbh Verfahren zum Ermitteln einer Einspritzbeginnverzugsdauer bei einem Kraftstoffinjektor
DE102017213127A1 (de) 2017-07-31 2019-01-31 Robert Bosch Gmbh Verfahren zum Ermitteln eines Kalibrierungsfaktors für einen Drucksensor eines Kraftstoffinjektors
DE102017213126A1 (de) 2017-07-31 2019-01-31 Robert Bosch Gmbh Verfahren zum Ermitteln einer von einem Kraftstoffinjektor abgegebenen Kraftstoffmenge
DE102017215967A1 (de) 2017-09-11 2019-03-14 Robert Bosch Gmbh Verfahren zum Ermitteln eines charakteristischen Zeitpunktes einer Kraftstoffeinspritzung
DE102017221973A1 (de) 2017-12-05 2019-06-06 Robert Bosch Gmbh Verfahren zum Ermitteln eines charakteristischen Zeitpunktes einer Kraftstoffeinspritzung
DE102018211665A1 (de) 2018-07-12 2020-01-16 Robert Bosch Gmbh Verfahren zum Ermitteln einer Schallgeschwindigkeit
CN109268184B (zh) * 2018-09-07 2021-11-30 机科发展科技股份有限公司 针阀体偶件开启压力测量方法
DE102018221604A1 (de) * 2018-12-13 2020-06-18 Robert Bosch Gmbh Kraftstoffinjektor

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WO2012115036A1 (fr) * 2011-02-25 2012-08-30 本田技研工業株式会社 Dispositif de détection de la pression intérieure d'un cylindre d'un moteur à combustion interne du type à injection directe

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Publication number Publication date
DE102014209330A1 (de) 2015-11-19
EP2944799A1 (fr) 2015-11-18

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