EP3032088A1 - Injecteur - Google Patents

Injecteur Download PDF

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Publication number
EP3032088A1
EP3032088A1 EP15192626.8A EP15192626A EP3032088A1 EP 3032088 A1 EP3032088 A1 EP 3032088A1 EP 15192626 A EP15192626 A EP 15192626A EP 3032088 A1 EP3032088 A1 EP 3032088A1
Authority
EP
European Patent Office
Prior art keywords
injector
sensor
pressure
pressure rod
rod
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Withdrawn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
EP15192626.8A
Other languages
German (de)
English (en)
Inventor
Hanna Zimmer
Udo Schaich
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 EP3032088A1 publication Critical patent/EP3032088A1/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Withdrawn legal-status Critical Current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
    • 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
    • F02M2200/244—Force 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

Definitions

  • the invention relates to an injector having an injector body and a nozzle body, wherein the injector has a high-pressure line carrying a fluid and a surface which is pressurized by the fluid or deformable by mechanical stresses, the injector having a sensor for detecting a change, in particular a deformation of the surface ,
  • Such an injector is from the EP 1 042 603 B1 known.
  • This injector is a fuel injector for injecting a fuel, wherein in the injector, a bore for guiding a nozzle orifice controlling a nozzle needle is arranged.
  • the nozzle opening can be supplied via a high pressure line of the fuel.
  • pressure changes which are transmitted to the injector or a surface of the injector, which cause a deformation of the surface and which in turn can be absorbed by a sensor, are triggered in the fuel ,
  • the sensor is embedded in an annular recess in the injector and glued for example in the recess.
  • the invention has for its object to provide an injector with at least one sensor for detecting a change in a surface, in particular a deformation of the surface at the injector, wherein the sensor is to be attached to the injector that a reliable function of the injector and the Sensor is ensured.
  • a pressure rod is arranged or connected to the injector and that the sensor is arranged on the pressure rod.
  • a deformation of the surface detected by the sensor may have arisen due to dynamic pressure changes or different pressure changes in the injector.
  • the recorded characteristic profiles of, for example, deformation can be analyzed and evaluated by appropriate evaluation algorithms with a corresponding evaluation device. According to the evaluation results, parameters at the device to which the injector belongs can be changed and optimized.
  • the sensor is not located directly in or on the changing surface of the injector, but can basically be arranged at any position of the pressure rod, which in turn is preferably arranged on the injector in a region of a clearly detectable change or deformation of the surface. Due to the constructive and material engineering design of the push rod a consistent signal quality can be ensured. In addition, no significant intervention in the injector is necessary by this configuration.
  • the surface is preferably an outer surface of the injector, in particular of the injector body and / or optionally of the nozzle body.
  • the senor is arranged at least approximately in the center of the pressure rod. This is due to the symmetrical arrangement, the preferred embodiment, thereby ensuring a consistent signal quality is ensured.
  • the pressure rod between the injector and a cooperating with the injector abutment is clamped.
  • the abutment is formed, for example, as a pot-shaped housing and takes in the cup-shaped interior of the push rod with the sensor.
  • the cup-shaped abutment can be attached to the injector, for example by means of a peripheral mounting flange, for example screwed or welded.
  • the connection of the pot-shaped abutment with the component can be designed hermetically sealed depending on the requirement, so that in the cup-shaped recess a constant volume of air is included, which ensures constant measurement conditions and prevents contamination of the measurement setup.
  • the trapped volume of air does not necessarily have to be hermetically sealed off from the environment, but serves once to protect the measurement setup against, for example, external mechanical damage and at the same time as a rigid abutment of the pressure rod.
  • the abutment is designed so that it can absorb the resulting deformations of the surface, which can be absorbed by the pressure forces from the pressure oscillations and the resulting compressive stress in the pressure rod over the life of the injector.
  • a conceivable attenuation of the signal due to stiffness losses is to be kept as low as possible, as these can weaken the measurement signal and possibly detune it.
  • suitable material pairings in the structure consisting of the pressure rod and the abutment with respect to the rigidity and the thermal expansion coefficients of the components to be selected and possibly taken into account can serve as an additional calibration aid for evaluation software.
  • the pressure rod is at least partially formed with a well-defined geometry, namely in particular cylindrical.
  • a regular adjustment of the "resting pressure level" is useful for checking the functionality of the system, for example, temperature influences capture and correct. From a functional point of view, however, this is not absolutely necessary since the measurement principle is based on a simple pressure change and not the absolute pressure change.
  • the pressure rod on a central and cylindrical taper which is bordered by opposite conically widening end portions.
  • the at least one sensor is arranged in the region of the taper.
  • the at least one pressure sensor is preferably glued to the pressure measuring rod in a suitable manner.
  • the corresponding attachment may include a mechanical bias applied to the sensor.
  • the attachment may include a spring and / or damping element. It is important that the contact surfaces between the pressure rod and the sensor at any time have contact with each other and not stand out even during a dynamic pressure change. The assignment of the components to each other should not change during operation, with a change would be given for example by a rotation of the push rod. For example, a constructive fixation in the required position, a stable signal over the life of the injector can be detected and evaluated.
  • the senor is a strain gauge sensor. This is the preferred embodiment, with corresponding strain gauge sensors being available in a variety of designs.
  • the pressure rod is separated from a fluid-carrying region, in particular the high-pressure line, of the injector.
  • the fluid-carrying region or the high-pressure line causes or causes the aforementioned pressurization.
  • the injector is preferably a fuel injector as part of a fuel injection system or a reducing agent injector of an exhaust aftertreatment system.
  • the injector thus serves to inject a fuel or a reducing agent.
  • Such an injector is installed on an internal combustion engine and by means of, for example, the fuel injector fuel is injected into an associated combustion chamber of the internal combustion engine. Due to the characteristic curves mentioned above and recorded, it is then possible, for example, to modify and optimize an activation of the fuel injector or of a fuel pump.
  • the in FIG. 1 injector shown is preferably a fuel injector, is injected with the pressurized fuel, which is taken, for example, a high-pressure accumulator of a common-rail injection system in a combustion chamber of an internal combustion engine on which the injection system is installed.
  • the injector can also be any other injector.
  • a pot-shaped abutment 12 Arranged on the injector is a pot-shaped abutment 12, which is explained below, which has a pressure rod 15 with a sensor 16 for detecting a change in a pressurized or mechanical stress deformable surface of the injector absorbs.
  • the fuel is in particular diesel fuel and the internal combustion engine is preferably a self-igniting internal combustion engine.
  • the injector has an injector body 1, which is screwed to a nozzle body 2 by means of a union nut 3.
  • a bore 4, 4a is incorporated, in which a nozzle needle 5 and a cooperating with the nozzle needle 5 actuating rod 6 are arranged axially movable.
  • a nozzle needle tip 7 of the nozzle needle 5 cooperates with a nozzle body seat 8 and closes at least one nozzle opening 9, which is arranged in the nozzle body 2 below the nozzle body seat 8.
  • the nozzle needle tip 7 In an open position of the nozzle needle 5, the nozzle needle tip 7 is in a spaced position relative to the nozzle body seat 8 and then releases a flow connection through a high-pressure bore 10, 10a embedded in the injector body 1 and the nozzle body 2 to the at least one nozzle opening 9. In this position, for example, fuel introduced from the high-pressure accumulator into the high-pressure line 10, 10a is injected through the at least one nozzle opening 9 into the associated combustion chamber of the internal combustion engine.
  • the nozzle needle 5 is adjusted, for example via the actuating rod 6 of a built-in injector body 1 actuator directly or indirectly in the open position and the closed position, to provide an electrical connection between the actuator and a control unit, a control line is provided by an actuator cable bore 11th is guided through the injector body 1.
  • the nozzle needle 5 is adjusted via a hydraulic control system.
  • a cup-shaped abutment 12 is attached to the injector body 1.
  • the pot-shaped abutment 12 has a peripheral fastening edge 13, in the region of which a circumferential weld seam 14 connects the cup-shaped abutment 12 tightly with the injector body 1 and absorbs and transmits the required abutment forces.
  • cup-shaped abutment 12 is an in FIG. 2 arranged closer to the pressure rod 15, on which distributed circumferentially sensors 16 are mounted to accommodate changes.
  • the changes are, in particular, a surface deformation of the injector body 1 in the region of the high-pressure line 10. This region of the injector body constitutes the surface described above.
  • the cup-shaped abutment 12 is arranged on the injector body 1 in such a way that the pressure rod 15 is arranged exactly perpendicular in the region of the high-pressure line 10 or oriented perpendicular to it.
  • FIG. 2 shown cross section through a portion of the injector body 1 and the cup-shaped abutment 10 welded thereto shows in detail the structure of the measuring device.
  • Trained as a housing cup-shaped abutment 12 is connected in the region of circumferential mounting edge 13 by means of the weld 14 with the injector 1.
  • the pot-shaped abutment 12 may have stiffening structures in the region of the pot periphery and is particularly stiff in the region of the pot bottom 17, a stiffening attachment plate 19 being arranged in the interior 18 formed by the cup-shaped abutment 12.
  • the push rod 15 is clamped, for example, facing each other conical relationship conical end portions 27 having a defined geometric taper 26 in its central region, for example in the form of a Border cylinder section.
  • the conical or conical end portions 27 are used in particular to ensure "smooth transitions", while the region of the taper 26 can be adjusted in its configuration to the load cases in shape and cross-section to an optimum.
  • four sensors 16 are arranged on the pressure rod 15, distributed over the circumference thereof, in particular adhesively bonded, the sensors 16 preferably being designed as strain gauge sensors or as MEMS pressure-strain sensors.
  • Each of the sensors 16 is connected to contacts 21a, 21b via cabling 20a, 20b. An electrical connection to an evaluation unit is made via lines connected to the contacts 21a, 21b. Each of the four sensors 16 may have their own contacts 21a, 21b or all four sensors 16 are connected to common contacts 21a, 21b.
  • the pressure rod 15 is aligned perpendicular to the deforming surface, wherein the high pressure line 10 is followed by a high-pressure area 22 of the injector body 1 or the high-pressure area 22 is the high pressure line 10.
  • the injector 1 In particular in the region of the high-pressure region 22, a membrane-forming wall 23 forming the surface can form, which can deform within the dashed region 24 (shown in a covered manner) in the direction of the pressure rod 15.
  • the injector body 1 has a wall region 25 with reduced stresses.
  • the changes thus recorded with the measuring device are evaluated by the evaluation device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP15192626.8A 2014-12-10 2015-11-02 Injecteur Withdrawn EP3032088A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014225348.9A DE102014225348A1 (de) 2014-12-10 2014-12-10 Injektor

Publications (1)

Publication Number Publication Date
EP3032088A1 true EP3032088A1 (fr) 2016-06-15

Family

ID=54365165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15192626.8A Withdrawn EP3032088A1 (fr) 2014-12-10 2015-11-02 Injecteur

Country Status (2)

Country Link
EP (1) EP3032088A1 (fr)
DE (1) DE102014225348A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10330063B2 (en) 2015-04-22 2019-06-25 Robert Bosch Gmbh Fuel injector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1042603B1 (fr) 1997-12-22 2003-04-09 Stanadyne Corporation Controle de la duree pour les injecteurs a rail commun
DE102005053683A1 (de) * 2005-11-10 2007-05-16 Bosch Gmbh Robert Kraftstoffeinspritzsystem für Brennkraftmaschinen
EP1854993A1 (fr) * 2006-05-12 2007-11-14 Delphi Technologies, Inc. Soupape d'injection du carburant
DE102010016424A1 (de) * 2009-04-21 2010-11-25 Denso Corporation, Kariya-City Kraftstoffeinspritzventil
DE102014209324A1 (de) * 2014-05-16 2015-11-19 Robert Bosch Gmbh Kraftstoffinjektor, insbesondere Common-Rail-Injektor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1042603B1 (fr) 1997-12-22 2003-04-09 Stanadyne Corporation Controle de la duree pour les injecteurs a rail commun
DE102005053683A1 (de) * 2005-11-10 2007-05-16 Bosch Gmbh Robert Kraftstoffeinspritzsystem für Brennkraftmaschinen
EP1854993A1 (fr) * 2006-05-12 2007-11-14 Delphi Technologies, Inc. Soupape d'injection du carburant
DE102010016424A1 (de) * 2009-04-21 2010-11-25 Denso Corporation, Kariya-City Kraftstoffeinspritzventil
DE102014209324A1 (de) * 2014-05-16 2015-11-19 Robert Bosch Gmbh Kraftstoffinjektor, insbesondere Common-Rail-Injektor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10330063B2 (en) 2015-04-22 2019-06-25 Robert Bosch Gmbh Fuel injector
EP3286428B1 (fr) * 2015-04-22 2021-08-18 Robert Bosch GmbH Injecteur de carburant

Also Published As

Publication number Publication date
DE102014225348A1 (de) 2016-06-16

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