EP2918819A1 - Injecteur de carburant, notamment injecteur à rampe commune - Google Patents

Injecteur de carburant, notamment injecteur à rampe commune Download PDF

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Publication number
EP2918819A1
EP2918819A1 EP15153456.7A EP15153456A EP2918819A1 EP 2918819 A1 EP2918819 A1 EP 2918819A1 EP 15153456 A EP15153456 A EP 15153456A EP 2918819 A1 EP2918819 A1 EP 2918819A1
Authority
EP
European Patent Office
Prior art keywords
fuel
injector
housing
sensor
pressure
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.)
Withdrawn
Application number
EP15153456.7A
Other languages
German (de)
English (en)
Inventor
Torsten Leukert
Bernd Berghaenel
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 EP2918819A1 publication Critical patent/EP2918819A1/fr
Withdrawn legal-status Critical Current

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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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
    • 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
    • F02M2200/24—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
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • 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
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
    • 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
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering

Definitions

  • the invention relates to a fuel injector, in particular a common rail injector, according to the preamble of claim 1. Furthermore, the invention relates to the use of a fuel injector according to the invention.
  • a fuel injector according to the preamble of claim 1 is known from EP 1 042 603 B1 known.
  • the known fuel injector has, within its injector housing, a sensor which is arranged in the region of a drainage bore between a control chamber of the fuel injector and a low-pressure region.
  • the sensor surrounds the drain hole on a sleeve-shaped portion of a component in which the drain hole is formed.
  • In the control chamber of the fuel injector protrudes into an end portion of a nozzle needle designed as an injection member.
  • the movement of the injection member is controlled in a known manner in order to release injection openings formed for injecting fuel into the combustion chamber of an internal combustion engine in the injector housing.
  • the pressure in the control chamber is effected via the outflow of fuel from said control chamber into the low-pressure region via the drainage hole, the drainage bore being closed by means of a closing member in the low-pressure region of the injector housing, which in turn can be actuated by an actuator, for example a solenoid actuator or a piezoactuator can.
  • an actuator for example a solenoid actuator or a piezoactuator can.
  • the known sensor is adapted to detect the pressure or pressure fluctuations in the drain hole caused by the opening of the closing member from the control room, resulting in the position of the Injector (nozzle needle) can be closed.
  • a disadvantage of the known arrangement is that the sensor is arranged in the high-pressure region of the injector and therefore must be designed structurally relatively expensive.
  • the available space for such a sensor in the injector is limited, so that special design solutions that are particularly critical in view of the strength of the injector, must be selected.
  • the invention has the object, a fuel injector, in particular a common rail injector, according to the preamble of claim 1 such that a simplified compared to the prior art construction is made possible, in particular within the Injector housing no or at least only insignificant structural changes caused by the sensor, with the otherwise occurring disadvantages required.
  • a fuel injector with the features of claim 1, characterized in that the sensor has a connectable to the injector housing sensor housing, that the sensor housing is arranged in operative connection with an elastically formed membrane element on which acts on one side of the pressure of the fuel in that, on the side of the membrane element facing away from the fuel, a measuring element for detecting a deformation of the membrane element is arranged in operative connection with the membrane element.
  • the sensor has a connectable to the injector housing sensor housing, that the sensor housing is arranged in operative connection with an elastically formed membrane element on which acts on one side of the pressure of the fuel in that, on the side of the membrane element facing away from the fuel, a measuring element for detecting a deformation of the membrane element is arranged in operative connection with the membrane element.
  • the proposed elastically formed membrane element pressure changes to a relatively large deformation of the membrane element and thus to a relatively easily formed by the particular as a piezo-element measuring element lead to evaluable signal.
  • thereby relatively small pressure fluctuations can be determined particularly simple, safe and reliable.
  • this is designed as a piezoelectric element.
  • Such an element has the advantage of a relatively high sensitivity with a compact design and low production costs.
  • the sensor housing has a channel for the fuel, which connects the fuel in the injector leading bore hydraulically with the membrane element.
  • the bore is the supply bore, that a branch branches off from the supply bore in the direction of the sensor housing, and that a receptacle for the sensor housing is formed in the injector housing.
  • the supply bore which serves to supply the high-pressure chamber with the fuel under high pressure, usually in relation to the cross section of the injector at an edge region of the injector in the longitudinal direction, so that a relatively short connection between the supply bore and the sensor via the branch is made possible.
  • the branch as well as the receptacle formed on the outer wall of the injector housing for the sensor housing are therefore also relatively easy to produce.
  • the sensor housing is connected to the receptacle by means of a threaded connection or by means of a welded connection.
  • a weld is preferred.
  • such a welded connection can be generated by means of a laser beam. This has the advantage that a high welding quality is made possible with simple process technology monitoring of the welding process.
  • a relatively simple adaptation of the sensor to a wide variety of requirements or system pressures is achieved when the membrane element is made of metal and is pressure-tightly connected to the sensor housing by means of a welded connection.
  • the membrane element is formed as a deep-drawn component and has a reduced wall thickness in the region of the piezoelectric element.
  • a clamping device for adjusting a force acting on the piezoelectric element biasing force.
  • the clamping device has clamping means for changing the biasing force.
  • the clamping means may be formed, for example in the form of clamping screws.
  • such a clamping device also allows the generation of a relatively high biasing force, which is therefore necessary or useful to compensate for expansions due to temperature influences.
  • the invention also includes the use of a fuel injector according to the invention in self-igniting internal combustion engines. This is the in the fuel injection system prevailing system pressure preferably more than 2000 bar.
  • an inventive fuel injector 10 is shown, as it serves as part of a so-called common-rail injection system for injecting fuel into the combustion chamber of an internal combustion engine, not shown.
  • the common rail injection system in this case has a system pressure of more than 2000 bar.
  • the fuel injector 10 comprises an injector housing 11, which in the illustrated embodiment consists essentially of three, in the axial direction adjoining components: On the combustion chamber, not shown Internal side facing the internal combustion engine, the injector 11 has a nozzle body 12, to which an intermediate plate 13, and in turn to this on the side facing away from the nozzle body 12, a holding body 14 connects.
  • the mentioned components of the injector 11 are in particular using a in the Fig. 1 Not shown nozzle retaining nut, as known from the prior art, axially clamped together sealingly.
  • the nozzle body 12 is at least one, but preferably a plurality of injection openings 15 for injecting the high-pressure fuel into the combustion chamber of the internal combustion engine is formed.
  • the nozzle body 12 forms in a blind hole-shaped recess 16 a high-pressure chamber 17, which is hydraulically connected via an inflow channel 18 to a seat 19 of the recess 16.
  • injection member in the form of a nozzle needle 25 is arranged.
  • the injection openings 15 are released in a raised position of the nozzle needle 25 for injecting fuel into the combustion chamber of the internal combustion engine.
  • the nozzle needle 25 is radially guided in the high-pressure chamber 17 within a holding body 27, wherein between the holding body 27 and a collar 28 of the nozzle needle 25 is designed as a closing spring compression spring 29 is arranged, the force is applied to the nozzle needle 25 in the direction of its closed position.
  • a low pressure region 31 of the injector 11 is formed in the holding body 14.
  • a coupler piston 35 is arranged in a recess 34, which forms on the nozzle needle 25 side facing a blind hole-shaped receptacle 36 for a cylindrically shaped upper end portion 37 of the nozzle needle 25.
  • the receptacle 36 serves to radially guide the end portion 37, wherein a different volume is formed depending on the position of the end portion 37 within a compensation chamber 39 in the receptacle 36.
  • the compensation chamber 39 is connected to the low-pressure region 31 in a pressure-relieving manner via a connecting bore 40.
  • the coupler piston 35 is encompassed radially by a coupler sleeve 42, which is supported axially on the intermediate plate 13 via a biting edge 43.
  • the coupler sleeve 42 is acted upon by means of a further compression spring 44, which is supported on the underside of a piezoelectric actuator 50, axially against the intermediate plate 13.
  • a coupler space 45 is formed between the intermediate plate 13 facing side of the coupler piston 35, the intermediate plate 13 and the coupler sleeve 42.
  • the piezoelectric actuator 50 is connected via connecting lines 51, 52 electrically connected to a voltage source, not shown.
  • a fuel source 58 rail
  • the pressure of the fuel prevailing in the supply bore 57 is detected by means of a sensor 60.
  • the Indian Fig. 2 Sensor 60 shown in greater detail has a sensor housing 61 with a carrier piece 62.
  • the metal support member 62 is configured to be connected to the injector housing 11 on the outside of the injector housing 11 of the fuel injector 10.
  • the injector housing 11 preferably in one of the at least one Injection opening 15 axially relatively widely spaced area, a blind hole-shaped receptacle 63 on.
  • a hydraulic connection is formed, which proceeds in the form of a branch 64 approximately at right angles from the supply bore 57 and opens centrally in the bottom 65 of the receptacle 63.
  • the support piece 62 has, at a region associated with the receptacle 63, an external thread 66 which cooperates with an internal thread 67 formed in the wall of the receptacle 63.
  • an external thread 66 which cooperates with an internal thread 67 formed in the wall of the receptacle 63.
  • a radially circumferential weld 69 is formed, which is preferably generated by a laser beam, as in a portion of the Fig. 2 for explanation.
  • the carrier piece 62 which is of essentially cylindrical design in the exemplary embodiment shown, has in its longitudinal axis a channel in the form of a through bore 71 which is aligned with the branch 64 and which widens by way of example, and not limitation, on the side facing away from the branch 64 in diameter.
  • the end region 72 of the support piece 62 facing the bottom 65 of the receptacle 63 rests against the bottom 65 of the receptacle 63, so that the fuel located in the branch 64 passes directly from the branch 64 into the region of the through bore 71.
  • the carrier piece 62 On the side of the carrier piece 62 opposite the end region 72, the latter has an annular end face 73, via which the carrier piece 62 is connected to a membrane element 75, preferably by a radially encircling weld seam 76 (FIG. Fig. 3 ), which is also preferably formed as a laser beam weld.
  • a membrane element 75 On the side of the carrier piece 62 opposite the end region 72, the latter has an annular end face 73, via which the carrier piece 62 is connected to a membrane element 75, preferably by a radially encircling weld seam 76 (FIG. Fig. 3 ), which is also preferably formed as a laser beam weld.
  • the membrane element 75 is made of metal and is preferably formed as a deep-drawn part. It has a cup-shaped cross-section, wherein the thickness S of the membrane element 75 in the region of the end face 73 is greater than the thickness s of the membrane element 75 in the axial direction of the through hole 71.
  • a significant elastic deformation of the wall thickness s having end face 77 of the membrane element 75 causes.
  • a corresponding expansion or curvature of the end face 77 of the membrane element 75 takes place, which manifests itself on the side facing away from the fuel of the membrane element 75 in a corresponding tensile stress and deflection of the material of the membrane element 75.
  • a measuring element in the form of a piezoelectric element 80 is connected to the end face 77 on the side of the end face 77 of the membrane element 75 facing away from the fuel, for example by a adhesive bond.
  • the membrane element 75 facing away from the side of the piezoelectric element 80 is arranged in operative connection with a clamping device 81.
  • the clamping device 81 is used to generate a bias on the piezoelectric element 80.
  • the clamping device 81 is in the form of a biasing plate 82 which is connected by means of at least two clamping screws 83, 84 with arms of the support piece 62.
  • the pretensioning force acting on the piezoelectric element 80 can be adjusted continuously.
  • To transfer the biasing force are located between the piezoelectric element 80 and the biasing plate 82 is still a contacting layer 85 and an insulator layer 86.
  • the piezoelectric element 80 is in particular connected to an evaluation circuit, not shown, that of the piezoelectric element 80 evaluates voltage signal generated due to the pressure P of the fuel, in order to conclude from the pressure P or a pressure change in the high-pressure chamber 17.

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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)
EP15153456.7A 2014-03-13 2015-02-02 Injecteur de carburant, notamment injecteur à rampe commune Withdrawn EP2918819A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014204629.7A DE102014204629A1 (de) 2014-03-13 2014-03-13 Kraftstoffinjektor, insbesondere Common-Rail-Injektor

Publications (1)

Publication Number Publication Date
EP2918819A1 true EP2918819A1 (fr) 2015-09-16

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ID=52432745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15153456.7A Withdrawn EP2918819A1 (fr) 2014-03-13 2015-02-02 Injecteur de carburant, notamment injecteur à rampe commune

Country Status (2)

Country Link
EP (1) EP2918819A1 (fr)
DE (1) DE102014204629A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3018337A1 (fr) * 2014-11-07 2016-05-11 Robert Bosch Gmbh Injecteur de carburant
EP3088729A1 (fr) * 2015-04-30 2016-11-02 Robert Bosch Gmbh Injecteur de carburant et dispositif et procede de montage d'un dispositif de mesure
EP3159533A1 (fr) * 2015-10-20 2017-04-26 Robert Bosch Gmbh Injecteur de carburant

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014219242A1 (de) 2014-09-24 2016-03-24 Robert Bosch Gmbh Kraftstoffinjektor und Verwendung eines Kraftstoffinjektors
DE102014222309A1 (de) 2014-10-31 2016-05-04 Robert Bosch Gmbh Kraftstoffinjektor
DE102014222292A1 (de) 2014-10-31 2016-05-04 Robert Bosch Gmbh Kraftstoffinjektor
DE102014222288A1 (de) 2014-10-31 2016-05-04 Robert Bosch Gmbh Kraftstoffinjektor
DE102014226437A1 (de) 2014-12-18 2016-06-23 Robert Bosch Gmbh Kraftstoffinjektor
DE102014226435A1 (de) 2014-12-18 2016-06-23 Robert Bosch Gmbh Kraftstoffinjektor
DE102016204801A1 (de) 2016-03-23 2017-09-28 Robert Bosch Gmbh Kraftstoffinjektor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2100002A (en) * 1981-06-05 1982-12-15 Bosch Gmbh Robert Fluid pressure sensors
EP1042603B1 (fr) 1997-12-22 2003-04-09 Stanadyne Corporation Controle de la duree pour les injecteurs a rail commun
US20090038589A1 (en) * 2007-08-07 2009-02-12 Dingle Philip J G Fuel injector and method for controlling fuel injectors
EP2105602A2 (fr) * 2008-03-28 2009-09-30 Denso Corporation Capteur de pression de carburant/assemblage de capteur, appareil d'injection de carburant, et appareil de détection de pression
US20100251998A1 (en) * 2009-04-03 2010-10-07 Denso Corporation Fuel injection valve
US20100263629A1 (en) * 2009-04-17 2010-10-21 Denso Corporation Fuel injection valve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2100002A (en) * 1981-06-05 1982-12-15 Bosch Gmbh Robert Fluid pressure sensors
EP1042603B1 (fr) 1997-12-22 2003-04-09 Stanadyne Corporation Controle de la duree pour les injecteurs a rail commun
US20090038589A1 (en) * 2007-08-07 2009-02-12 Dingle Philip J G Fuel injector and method for controlling fuel injectors
EP2105602A2 (fr) * 2008-03-28 2009-09-30 Denso Corporation Capteur de pression de carburant/assemblage de capteur, appareil d'injection de carburant, et appareil de détection de pression
US20100251998A1 (en) * 2009-04-03 2010-10-07 Denso Corporation Fuel injection valve
US20100263629A1 (en) * 2009-04-17 2010-10-21 Denso Corporation Fuel injection valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3018337A1 (fr) * 2014-11-07 2016-05-11 Robert Bosch Gmbh Injecteur de carburant
EP3088729A1 (fr) * 2015-04-30 2016-11-02 Robert Bosch Gmbh Injecteur de carburant et dispositif et procede de montage d'un dispositif de mesure
EP3159533A1 (fr) * 2015-10-20 2017-04-26 Robert Bosch Gmbh Injecteur de carburant

Also Published As

Publication number Publication date
DE102014204629A1 (de) 2015-09-17

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