EP3034854B1 - Injecteur de carburant et procédé de reconnaissance au moins du moment de fermeture d'un élément d'injection - Google Patents

Injecteur de carburant et procédé de reconnaissance au moins du moment de fermeture d'un élément d'injection Download PDF

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Publication number
EP3034854B1
EP3034854B1 EP15192634.2A EP15192634A EP3034854B1 EP 3034854 B1 EP3034854 B1 EP 3034854B1 EP 15192634 A EP15192634 A EP 15192634A EP 3034854 B1 EP3034854 B1 EP 3034854B1
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EP
European Patent Office
Prior art keywords
injector
housing
fuel injector
recess
fuel
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
EP15192634.2A
Other languages
German (de)
English (en)
Other versions
EP3034854A1 (fr
Inventor
Marco Stieber
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3034854A1 publication Critical patent/EP3034854A1/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
    • 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time
    • 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
    • F02M2200/241—Acceleration or vibration sensors

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1. Furthermore, the invention relates to a method for detecting at least the firing time of an injection member in a fuel injector by means of a sensor device.
  • a fuel injector according to the preamble of claim 1 is known from DE 10 2011 090 004 A1 the applicant known.
  • the known fuel injector has at the side facing away from an injection opening side of its injector on a trained as a blind hole recess.
  • the recess is formed on an outer end face of the injector and serves to receive a sensor element designed as a piezoelectric element.
  • the sensor element can be closed due to a measurement of the voltage signal on the closing time of an injection member (nozzle needle).
  • structure-borne sound signals are evaluated, which are generated upon impact of the injection member in their seat in the injector.
  • the detection of the closing time of the injection member is used, in particular over the life of the fuel injector, to adjust the injection time or the injection duration of the fuel injector for optimizing, for example, the exhaust gas values. Details regarding the manner in which the sensor element is received or arranged within the recess can not be deduced from the cited document. Moreover, it is known from the prior art to arrange sensor elements by means of an adhesive layer in operative connection with, for example, an injector housing. A disadvantage of such adhesive compounds in particular the durability of the adhesive joint over the life of the fuel injector is considered due to the occurrence of relatively high temperatures and due to media influences.
  • the invention has the object, a fuel injector according to the preamble of claim 1 such that viewed over the life of the fuel injector always reliable and accurate detection of the closing time of the injector is possible.
  • the axial preload is adjustable by means of a spring element. Depending on the dimensioning of the spring element, the required contact force on the sensor element is achieved.
  • the spring element is designed as a compression spring which is supported between a side of the sensor element facing away from the contact surface and a housing element of the injector housing.
  • Such a structural configuration has the particular advantage of a relatively simple mounting of the spring element, since this does not have to be secured or secured by additional, separate fasteners, but is alone positioned by the respective end-face contact between the housing element and the sensor element in its designated position ,
  • the sensor element in a fuel injector which is designed as a common rail injector prevail in the injector very high pressures, for example, more than 2000 bar.
  • the sensor element For the detection of structure-borne noise, it may be advantageous to arrange the sensor element as close as possible to the source of structure-borne noise.
  • a recess arranged within the injector housing for receiving the sensor element if this can be realized relatively easily in terms of production engineering. Therefore, it is provided in a further preferred embodiment of the invention that the recess in the region of a holding body of the injector on the side facing a valve plate is formed as a formed in an end face of the holding body blind hole.
  • the contact surface is in particular formed directly from an end face of the valve plate. In the formation of the contact surface, care must be taken only that a sufficient contact between the sensor element and the valve plate is formed. This is achieved for example by a corresponding low roughness of the contact surface, but which is usually in the for Discussion valve plates, as are commonly used in such fuel injectors, is given.
  • valve plate is clamped axially by means of a nozzle retaining nut axially at least indirectly against the holding body ,
  • the invention also includes a method for detecting at least the closing time of an injection member in a fuel injector by means of a sensor device, wherein the fuel injector according to the above comments is designed according to the invention.
  • a method according to the invention is characterized in that, in addition, the opening time of the injection member is also detected.
  • Such a method allows an even more accurate detection of the injection parameters or an optimized control of the injection member.
  • the detection of the opening time of the injection member is due to a pressure drop in a control chamber in the injector.
  • a corresponding valve member lifts from a seat and allows outflow of fuel from the control chamber in a low pressure region of the fuel injector, whereby structure-borne noise signals are generated, which allow a conclusion about the opening time of the injection member by means of the sensor device.
  • the Indian Fig. 1 Area-wise illustrated fuel injector 10 is used for injecting fuel into the combustion chamber of an internal combustion engine, not shown.
  • the fuel injector 10 is designed as a so-called common-rail injector for self-igniting internal combustion engines, wherein in the fuel injector 10, for example, a system pressure of more than 2000bar prevails.
  • the fuel injector 10 has a multi-part injector housing 11.
  • the injector housing 11 comprises in particular a holding body 12, a valve plate 13 adjoining it in the axial direction on the side facing the combustion chamber, a throttle plate 14 and a nozzle body 15.
  • In the nozzle body 15 is at least one, but in practice a plurality of injection ports 16 for Injection of fuel formed in the combustion chamber of the internal combustion engine.
  • the nozzle body 15 is partially radially surrounded by a nozzle retaining nut 17 which clamps the nozzle body 15 under axial intermediate position of the valve plate 13 and the throttle plate 14 against the holding body 12, as is known from the prior art per se.
  • a high-pressure chamber 20 is formed, in which fuel under system pressure fuel can be stored. Further, within the high-pressure chamber 20, a nozzle needle 22 arranged in a liftable manner in the direction of the double arrow 21 is arranged as an injection member. In the in the Fig. 1 shown position, the nozzle needle 22 is in its lowered position, in which this rests on the inside of the nozzle body 15 to form a sealing seat and thereby at least indirectly closes the injection ports 16, to inject fuel into the combustion chamber To avoid internal combustion engine. In her raised, in the Fig. 1 unrecognizable position, the nozzle needle 22, the injection ports 16 free, so that fuel is discharged from the high-pressure chamber 20 via the injection ports 16 into the combustion chamber of the internal combustion engine.
  • the supply of the high-pressure chamber 20 with fuel under system pressure takes place in a manner known per se by a high-pressure bore, not shown in the figures, formed in the injector housing 11.
  • the injection ports 16 opposite the end of the nozzle needle 22 is disposed radially within a valve member 25, which in turn is axially against the valve plate 13 facing away from the end face of the throttle plate 14 is supported.
  • a control chamber 26 is formed, which serves in a known manner, the control of the lifting movement of the nozzle needle 22.
  • the control chamber 26 via a in the Fig. 1 merely indicated drain hole 27 in a low pressure region of the injector 11 pressure relieved. This is done via a in the Fig. 1 also not shown valve element which can be controlled for example by means of a solenoid actuator or by means of a piezoelectric actuator and serves to open the drain hole 27 and close.
  • the sensor device 30 additionally serves to detect the opening time of the nozzle needle 22.
  • the sensor device 30 has a sensor element 31, which is in the form of a Piezoelectric element is formed.
  • the sensor element 31 is designed to detect structure-borne noise, as typically occurs when the nozzle needle 22 encounters its sealing seat within the nozzle body 15 when the injection openings 16 are closed.
  • the pressure relief of the control chamber 26 is detected via a structure-borne noise measurement, in which the taking place by releasing the drain hole 27 pressure reduction in the control chamber 26 is detected.
  • the sensor element 31 is located with a sensitive to the measurement of structure-borne sound contact surface 35 on a contact surface 34 which formed by the holding body 12 facing end face of the valve plate 13 is.
  • the recess 33 is formed in the illustrated embodiment as a bore with a circular cross-sectional area and disposed at a distance a from a fuel-carrying portion 36 of the injector 11.
  • a further recess 41 also passes as a through hole having a relatively small cross-section, which serves to receive an electrical connection line 42 for the sensor element 31.
  • the connecting line 42 can be designed, for example, in the form of enameled wires, so that the diameter or cross section of the connecting line 42 is as small as possible.
  • the connecting line 42 is guided in a manner not shown, for example in the region of the connector of the fuel injector 10, so that at the same time the electrical contact of the fuel injector 10, the sensor element 31 is electrically contacted.
  • a spring element 45 is supported in the form of a compression spring 46 from.
  • the compression spring 46 is electrically insulated from the sensor element 31 and the injector housing 11, so that the injector housing 11 can serve as electrical ground for the sensor element 31.
  • the spring element 45 is arranged under pretension between the base 39 and the sensor element 31, that in which in the Fig.
  • the fuel injector 10 described so far can be modified or modified in many ways, without departing from the spirit of the invention.
  • a non-conductive elastomer instead of a compression spring 46 as a spring element 45, which is arranged under prestress in the recess 33.

Landscapes

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

Claims (9)

  1. Injecteur de carburant (10) comprenant un boîtier d'injecteur (11) dans lequel est disposé de manière déplaçable en va-et-vient un organe d'injection (22) pour fermer et ouvrir au moins une ouverture d'injection (16) réalisée dans le boîtier d'injecteur (11), et comprenant un dispositif de capteur (30) pour détecter au moins l'instant de fermeture de l'organe d'injection (22), le dispositif de capteur (30) présentant un élément de capteur (31) réalisé sous forme d'élément piézoélectrique, qui est disposé dans un évidement (33) du boîtier d'injecteur (11) en contact d'application contre le boîtier d'injecteur (11) et qui est réalisé de manière à détecter l'instant de fermeture de l'organe d'injection (22) sur la base d'un signal de bruit de structure, l'élément de capteur (31) s'appliquant avec précontrainte axiale contre une surface de contact (34),
    caractérisé en ce que
    l'évidement (33) est disposé complètement à l'intérieur du boîtier d'injecteur (11) ou l'évidement (33), à l'exception d'un évidement supplémentaire (41) pour recevoir une conduite de raccordement électrique (42) pour l'élément de capteur (31), est disposé complètement à l'intérieur du boîtier d'injecteur (11).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    la précontrainte axiale peut être ajustée au moyen d'un élément de ressort (45).
  3. Injecteur de carburant selon la revendication 2,
    caractérisé en ce que
    l'élément de ressort (45) est réalisé sous forme de ressort de compression (46) qui s'appuie entre un côté de l'élément de capteur (31) opposé à la surface de contact (34) et un élément de boîtier (12) du boîtier d'injecteur (11).
  4. Injecteur de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    l'évidement (33) est réalisé de manière étanche aux fluides par rapport à une région guidant le carburant (36) du boîtier d'injecteur (11).
  5. Injecteur de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    l'évidement (33) est réalisé, dans la région d'un élément de boîtier (12) du boîtier d'injecteur (11) réalisé sous forme de corps de retenue, sur le côté tourné vers une plaque de soupape (13), en tant qu'alésage borgne disposé dans une surface frontale (37) de l'élément de boîtier (12).
  6. Injecteur de carburant selon la revendication 5,
    caractérisé en ce que
    la surface de contact (34) est formée par une surface frontale de la plaque de soupape (13).
  7. Injecteur de carburant selon la revendication 5 ou 6,
    caractérisé en ce que
    la plaque de soupape (13) est précontrainte axialement au moins indirectement contre l'élément de boîtier (12) au moyen d'un écrou de serrage de buse (17).
  8. Procédé pour détecter au moins l'instant de fermeture d'un organe d'injection (22) dans un injecteur de carburant (10) au moyen d'un dispositif de capteur (30), l'injecteur de carburant (10) étant réalisé selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que
    l'instant d'ouverture de l'organe d'injection (22) est également détecté.
  9. Procédé selon la revendication 8,
    caractérisé en ce que
    la détection de l'instant d'ouverture de l'organe d'injection (22) s'effectue sur la base d'une réduction de pression dans un espace de commande (26) dans le boîtier d'injecteur (11).
EP15192634.2A 2014-12-15 2015-11-02 Injecteur de carburant et procédé de reconnaissance au moins du moment de fermeture d'un élément d'injection Active EP3034854B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014225894.4A DE102014225894A1 (de) 2014-12-15 2014-12-15 Kraftstoffinjektor und Verfahren zur Erkennung zumindest des Schließzeitpunkts eines Einspritzglieds

Publications (2)

Publication Number Publication Date
EP3034854A1 EP3034854A1 (fr) 2016-06-22
EP3034854B1 true EP3034854B1 (fr) 2018-06-27

Family

ID=54365167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15192634.2A Active EP3034854B1 (fr) 2014-12-15 2015-11-02 Injecteur de carburant et procédé de reconnaissance au moins du moment de fermeture d'un élément d'injection

Country Status (2)

Country Link
EP (1) EP3034854B1 (fr)
DE (1) DE102014225894A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110052357B (zh) * 2019-05-15 2021-06-15 哈尔滨工业大学 一种应用于高粘度流体喷射的阀门可调式压电微喷机构

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19813756A1 (de) * 1998-03-27 1999-10-07 Siemens Ag Messung des Drucks eines Fluids
DE102009000741A1 (de) * 2009-02-10 2010-08-12 Robert Bosch Gmbh Verfahren zum Bestimmen eines Nadelschließens
DE102011090004A1 (de) 2011-12-28 2013-07-04 Robert Bosch Gmbh Verfahren und Anordnung zum Bestimmen eines Nadelschließens einer Ventilnadel

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
DE102014225894A1 (de) 2016-06-16
EP3034854A1 (fr) 2016-06-22

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