EP2202404A1 - Injecteur piézoélectrique - Google Patents

Injecteur piézoélectrique Download PDF

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Publication number
EP2202404A1
EP2202404A1 EP09174296A EP09174296A EP2202404A1 EP 2202404 A1 EP2202404 A1 EP 2202404A1 EP 09174296 A EP09174296 A EP 09174296A EP 09174296 A EP09174296 A EP 09174296A EP 2202404 A1 EP2202404 A1 EP 2202404A1
Authority
EP
European Patent Office
Prior art keywords
contact elements
piezo injector
connector
injector
electrically conductive
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Withdrawn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
EP09174296A
Other languages
German (de)
English (en)
Inventor
Holger Rapp
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 EP2202404A1 publication Critical patent/EP2202404A1/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Withdrawn legal-status Critical Current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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details

Definitions

  • the invention relates to a piezoelectric injector which is preferably used in the automotive sector.
  • a piezoactuator can be used in such a way that, taking advantage of the so-called piezoelectric effect, it is possible to control the needle stroke of a valve of the piezo injector.
  • the piezoelectric actuator is constructed of a material having a suitable crystal structure so that when an external electrical voltage is applied, a mechanical reaction takes place which, depending on the crystal structure and the contact areas of the electrical voltage, represents a pressure or tension in a predeterminable direction. Piezoinjectors equipped with this are suitable, for example, for applications in which lifting movements take place under high operating forces and high clock frequencies.
  • a piezoelectric actuator for a piezoelectric injector is described, which is used under control of a nozzle needle for the injection of fuel into the combustion chamber of an internal combustion engine of a motor vehicle.
  • the actuation of the piezo injector is carried out by a control unit in which all operating parameters of the current vehicle state are evaluated, from which then a situational injection time results, in which the piezoelectric actuator of the piezoelectric injector is loaded.
  • the charge on the piezoactuator keeps the piezo injector open and fuel is injected.
  • the charge of the piezoelectric actuator is discharged again by the control unit.
  • the discharge of the piezoelectric actuator must be ensured in order to prevent uncontrolled injection of potentially large quantities of fuel through the piezo injector excluded.
  • a discrete discharge resistor which is connected in parallel to the piezoelectric actuator in the piezo injector.
  • a typical resistance value is 180 k ⁇ . This resistor is welded before the encapsulation of plug contacts of the piezo injector between terminal lugs of the plug and then encapsulated with.
  • the invention has for its object to design a piezoelectric injector so that the functionality of the bleeder is maintained and the costs caused by it saved or at least reduced.
  • the object is achieved by a piezo injector according to claim 1.
  • the piezoinjector with an electrically contactable piezoelectric actuator for controlling an actuator, with which a fluid can be metered has a connector, whose contact elements mounted in a contact carrier are electrically connected to the piezoelectric actuator.
  • the contact elements are mounted on the connector or the contact carrier in an electrically conductive plastic, so that in a blocked external discharge of the piezoelectric actuator, an automatic discharge of the piezoelectric actuator is possible. This function can be realized in an advantageous manner without separate steps in the production.
  • the connector may be formed of electrically conductive plastic, which is externally accessible.
  • the formation of the contact carrier made of electrically conductive plastic omits a high-resistance contact with the surface of the piezo injector. By bridging the contact elements with a resistance value in the range of 80 - 260 k ⁇ , preferably 180 k ⁇ , so can meet safety requirements without further components.
  • FIG. 1 shows in a longitudinal section through a Injektorkopfteil a first embodiment and FIG. 2 in a section II - II off FIG. 1 A second embodiment of the piezo injector according to the invention.
  • FIGS. 1, 2 illustrated Injektorkopfteil 10 as an integral part of a piezoelectric injector 12 according to the invention has a holding body 11 with a terminal 13 for fuel, which is metered by means of a piezaktor 14 shown only partially.
  • a flow channel 16 connects the piezoelectric actuator 14 with the terminal 13th
  • an electrical terminal compartment 17 is attached to the holding body 11.
  • a radially projecting connector 18 as part of a partial encapsulation 19 of the piezoelectric injector 12, a base support 21, a contact carrier 22 and a filler 23 is arranged.
  • electrical lines 24 are included, which emanate from contact elements 26 of the connector plug 18 and lead to which in the piezoelectric actuator 14.
  • the pin-shaped contact elements 26 protrude perpendicularly from a bottom plate 27 of the Connector plug 18 freestanding in a box-shaped receiving space 28 which serves to receive a mating connector.
  • the electrical contact between the piezoelectric actuator 14 connected to the electrical lines 24 and the contact elements 26 is arranged in a manner not shown.
  • the contact elements 26 are anchored, preferably by injection, and are aligned and guided by this.
  • the filling piece 23, which adjoins the contact carrier 22, serves to equalize the volume in order to achieve uniform wall thicknesses for the extrusion coating 19.
  • the contact carrier 22 is formed from the electrically conductive plastic, so that here the electrical path between the contact elements 26 is formed.
  • the electrical path is applied in an insulated manner in the injector head part 10 of the piezoinjector 12 and the high-resistance contact with the surface of the piezo injector 12 is completely eliminated.
  • Both embodiments have in common that the electrical resistance of the electrical path between the contact elements 26 may be in the range of 80-260 k ⁇ and is preferably 180 k ⁇ .

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP09174296A 2008-12-23 2009-10-28 Injecteur piézoélectrique Withdrawn EP2202404A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008055119A DE102008055119A1 (de) 2008-12-23 2008-12-23 Piezoinjektor

Publications (1)

Publication Number Publication Date
EP2202404A1 true EP2202404A1 (fr) 2010-06-30

Family

ID=41559672

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09174296A Withdrawn EP2202404A1 (fr) 2008-12-23 2009-10-28 Injecteur piézoélectrique

Country Status (2)

Country Link
EP (1) EP2202404A1 (fr)
DE (1) DE102008055119A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2547660A (en) * 2016-02-24 2017-08-30 Delphi Int Operations Luxembourg Sarl Fuel injector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003071123A1 (fr) * 2002-02-19 2003-08-28 Siemens Aktiengesellschaft Injecteur presentant une meilleure geometrie de connexion
EP1587152A2 (fr) * 2004-04-15 2005-10-19 Robert Bosch Gmbh Dispositif avec actionneur piézoélectrique
DE102005042759A1 (de) * 2004-09-09 2006-04-13 Denso Corp., Kariya Piezoelektrischer Aktor
EP1758237A1 (fr) * 2005-08-22 2007-02-28 Robert Bosch Gmbh Dispositif comprenant un actionneur piézoélectrique et un procédé de sa fabrication

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10026005B4 (de) 2000-05-25 2004-07-08 Robert Bosch Gmbh Piezoaktor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003071123A1 (fr) * 2002-02-19 2003-08-28 Siemens Aktiengesellschaft Injecteur presentant une meilleure geometrie de connexion
EP1587152A2 (fr) * 2004-04-15 2005-10-19 Robert Bosch Gmbh Dispositif avec actionneur piézoélectrique
DE102005042759A1 (de) * 2004-09-09 2006-04-13 Denso Corp., Kariya Piezoelektrischer Aktor
EP1758237A1 (fr) * 2005-08-22 2007-02-28 Robert Bosch Gmbh Dispositif comprenant un actionneur piézoélectrique et un procédé de sa fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2547660A (en) * 2016-02-24 2017-08-30 Delphi Int Operations Luxembourg Sarl Fuel injector
WO2017144313A1 (fr) * 2016-02-24 2017-08-31 Delphi International Operations Luxembourg S.À R.L. Injecteur de carburant

Also Published As

Publication number Publication date
DE102008055119A1 (de) 2010-07-01

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