EP1846656A1 - Separation electrique dans des injecteurs de carburant - Google Patents

Separation electrique dans des injecteurs de carburant

Info

Publication number
EP1846656A1
EP1846656A1 EP05823893A EP05823893A EP1846656A1 EP 1846656 A1 EP1846656 A1 EP 1846656A1 EP 05823893 A EP05823893 A EP 05823893A EP 05823893 A EP05823893 A EP 05823893A EP 1846656 A1 EP1846656 A1 EP 1846656A1
Authority
EP
European Patent Office
Prior art keywords
functional unit
electrical
valve
electrically controllable
contact
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.)
Granted
Application number
EP05823893A
Other languages
German (de)
English (en)
Other versions
EP1846656B1 (fr
Inventor
Christoph Butscher
Juergen Frasch
Stephan Wehr
Michael Fleig
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 EP1846656A1 publication Critical patent/EP1846656A1/fr
Application granted granted Critical
Publication of EP1846656B1 publication Critical patent/EP1846656B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
    • 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

Definitions

  • fuel injectors which contain one or more electrically controllable valves.
  • an electrically controllable solenoid or piezoelectric valve can be provided for controlling a needle valve and thus for controlling the course of the injection.
  • Other valves can be used for example for a pressure boosting.
  • the separate testing of the functionality of the individual valves and the components connected to these valves or controlled by these valves is often a challenge.
  • the testing of the various functionalities of the fuel injectors sometimes poses considerable problems.
  • the fuel injector if a malfunction occurs in the assembled state during testing, usually again consuming to disassemble. After the repair or replacement of individual components (eg an electrically controllable valve) and reassembly, the functionality must then be tested again. This method is in many cases too time-consuming and thus unprofitable.
  • an injector body of the fuel injector has at least two separate functional units which are independently functional and independently testable (for example at least with respect to at least one respective functionality).
  • one functional unit may have a control module for controlling a pressure transmission of a fuel pressure and another functional unit may have a nozzle module for actuating an injection process by means of an injection valve member.
  • the functional units are reversibly connected to one another via at least one frictional connection element (for example a union nut) and at least one positioning pin.
  • the two functional units each have at least one electrically controllable valve (for example a solenoid valve).
  • the fuel injector can have at least one electrical injector body contact accessible from an outer side of the injector body, wherein the second electrically controllable valve has at least one valve contact, and wherein the at least one electrical valve contact and the at least one electrical injector body contact at least partially cover at least one of its own Weight are connected to substantially dimensionally stable electrical solid conductor.
  • This electrical connection between valve contacts and injector body contact may preferably also comprise at least one electrical plug contact, in which, for example, the at least one electrical solid conductor is inserted.
  • the fuel injector according to the invention allows a much simplified compared to the prior art manufacturing process.
  • a first functional unit can firstly be produced and tested, for example with respect to the functionality of an electrically controllable valve.
  • a second functional unit is manufactured and tested, again for example with regard to the functionality of an electrically controllable valve.
  • the functional units are reversibly connected to each other by means of the non-positive connecting element, wherein an electrical connection between the at least one injector body contact the least one valve contact is made, for example by inserting into an electrical plug contact.
  • the separate testing of the individual functional units significantly increases the process stability during the production of the fuel injectors and makes it possible to detect errors (for example, electrical faults of the individual valves) at an early stage and to correct them if necessary.
  • the functional units can thus also be produced separately and independently of each other. Even a simple disassembly and repair for maintenance is possible. This reduces overall manufacturing and maintenance costs and increases the reliability of the fuel injectors.
  • Figure 1 is a sectional view of a first functional unit (control unit) and a second control unit (nozzle unit) having fuel injector;
  • FIG. 2A is a perspective view of the separation of the control unit and the nozzle unit
  • Figure 2B is a perspective view of the control unit
  • Figure 2C is a partial perspective view of the nozzle unit
  • FIG. 3A is a perspective view of a control unit positioned by means of positioning pins relative to a nozzle unit;
  • FIG. 3B is a perspective view of the functional units according to FIG. 3A after the control unit and the nozzle unit have been plugged together;
  • Figure 3 C is a perspective view of a non-positive connection of the two functional units of Figure 3B by means of a union nut;
  • FIG. 4 shows a flowchart of a method according to the invention.
  • FIG. 1 shows an overall view of a preferred exemplary embodiment of an injector body 110 for a common-rail injection system.
  • the injector body 110 can be dismantled at the butt joints 124, 126, 128 and 130 into substantially five functional modules 132, 134, 136, 138, 140: a control module 132, a sealing plate 134, a line connection module 136, a pressure booster module 138 and a nozzle module 140.
  • the pressure translator module 138 essentially serves to translate a fuel pressure which is provided by an external pressure source, for example via a high-pressure common rail, at the fuel injector (for example 1000 bar) into a second pressure (for example 2200 bar). so that two working pressures are available for the injection process.
  • the nozzle module 140 has an injection valve member 146 (only symbolically indicated in FIG. 1), for example a nozzle needle, which controls the actual injection process into the combustion chamber of an internal combustion engine (for example via injection openings).
  • the modules 132, 134, 136 and 140 are grouped in this embodiment into two functional units 148, 150: one comprising the control module 132 and the sealing plate 134 Control unit 148 and a nozzle unit 150 comprising the line connection module 136, the pressure booster module 138 and the nozzle module 140.
  • These two functional units 148 and 150 are separated from each other by the second butt joint 126 and are reversibly connected by a cap nut 152.
  • the functional units 148, 150 are still connected to one another via the positioning pins 154 (only one of the positioning pins 154 can be seen in the sectional view according to FIG Line connection module 136 are included.
  • the injector body 110 has two solenoid valves 111, 112: a first solenoid valve 111 arranged in the control module 132 for controlling the pressure transmission in the pressure booster module 138, and a second solenoid valve 112 arranged in the nozzle module 140 for controlling the actual injection process via the injection valve member 146.
  • the separability of the two functional units 148, 150 along the second butt 126 causes the ("dry") control module 132 and the "wet" portion of the injector body 110 below the first butt 124 to be separately designed, manufactured, and tested. to be assembled afterwards.
  • the separability for maintenance purposes for example, easily replace individual components of the injector body 110, which accommodates the "system repair idea” (SIS).
  • SIS system repair idea
  • the solenoid valve 112 in the nozzle module 140 is electrically actuated via two electrical valve contacts 114.
  • the injector body 110 has at its upper end an electrical injector body contact 116 accessible from above.
  • the realization of a disassembly of the injector body 110 or a simple modular assembly consists in the illustrated modular design of the injector body 110 in such a way to electrically connect the valve contacts 114 to the injector body contact 116 that further ensures easy assembly and disassembly of the injector body.
  • two conductor channels 120 are provided in this embodiment, which extend through the modules 138, 136 and 134.
  • the conductor channels 120 are formed by bores in the pressure booster module 138, in the line connection module 136 and in the sealing plate 134. When the injector body 110 is assembled, these bores are in each case flush with the butt joints 128 and 126, so that a single, continuous conductor channel 120 results.
  • the individual holes of the conductor channel 120 have in this embodiment in the individual modules 138, 136, 134 each have a straight course. A curved course of the holes can be realized with the inventive solution.
  • the bores in the individual modules 138, 136, 134 each have a different inclination to an injector axis 142.
  • the conductor channel 120 in the pressure booster module 138 has an inclination of 1 ° to the injector axis 142
  • the inclination in this embodiment in the line connection module 136 is 2.2 °.
  • the connection between the two electrical valve contacts 114 of the solenoid valve 112 and the injector body 116 in this embodiment partially via two solid conductors 118.
  • the solid conductors 118 extend through the two conductor channels 120 and connect the valve contacts 114 with electrical plug contacts 122, which in turn an electrical connection 144 (for example, two cables each soldered at one end to an electrical plug contact 122 and at another end to the injector body contact 116) are connected to the injector body contact 116.
  • the solid conductors 118 are permanently or detachably electrically connected to the valve contacts 114 of the solenoid valve 112.
  • connection of the solid conductors 118 with the plug contacts 122 is reversible, so that this connection can be made during assembly of the injector body 110, so when mating control unit 148 and nozzle unit 150 by simply pressing in the solid conductor 118 into the plug contacts 122.
  • the solid conductors 118 can be easily removed again from the plug contacts 122, and thus the injector body 110 can be broken down again into the two functional units 148, 150 without unsoldering of electrical connections.
  • the solid conductors 118 are stiff enough that they on the one hand do not change their shape substantially under their own weight and thus thread easily through the conductor channels 120 with their different inclinations to Injektorachse 142 and plug into the plug contacts 122.
  • the solid conductors should have a certain plasticity, so that no mechanical stresses occur at the transition between sections of the conductor channels 120 with different angles of inclination.
  • the term "solid conductor” does not necessarily restrict the selection of materials to solid materials, but it is also possible, for example, to use waveguides (tubes) as solid conductors 118, provided they have sufficient mechanical rigidity. In the exemplary embodiment illustrated in FIG.
  • the solid conductors 118 have CuSn ⁇ with a Brinell hardness between 80 and 90 HB as the material which is otherwise used, for example, as a welding filler.
  • the material which is otherwise used for example, as a welding filler.
  • These materials meet the above requirements for hardness and plasticity and are also easily connected by welding with the valve contacts 114.
  • the hardness of the materials should be between 50 and 100 HB, preferably between 60 and 95 HB and particularly advantageously between 75 and 90 HB.
  • FIGS. 2A to 2C the composition of the fuel injector from the two individual functional units 148 and 150 is shown in perspective.
  • Figure 2 A can be seen how the control unit 148 and the nozzle unit 150 along the butt joint 126 can be separated from each other by the union nut 152 is released.
  • the nozzle unit 150 has a fuel supply nozzle 210, via which the nozzle unit 150 can be supplied with fuel.
  • This fuel supply nozzle 210 may for example be connected to a high-pressure accumulation chamber (common rail).
  • the sealing plate 134 see FIG.
  • FIG. 2B shows a control unit in perspective view. It can be seen here that the injector body contact 116, which is arranged on the upper side of the control unit 148, has four individual connection bolts 212 in this exemplary embodiment. In each case one of the two solenoid valves 111, 112 can be actuated via in each case two of these connection bolts 212.
  • FIG. 2B shows the upper end of the nozzle unit 150 in a perspective partial view. It can be seen that the upper ends of the solid conductors 118 protrude from the line connection module 136.
  • the solid conductors 118 are encased for insulation against the injector body 110 with shrink tubing 214, but the upper ends are stripped to make contact.
  • the functional units 148, 150 are plugged together, the upper ends of the solid conductors 118 are pushed through conductor channels 120 in the sealing plate 134 and inserted into the plug contacts 122.
  • O-rings 216 are plugged, which are intended to additionally prevent the penetration of fuel from the nozzle unit 150 along the solid conductors 118 into the control unit 148.
  • FIG. 2C also shows the openings of the positioning bores 156 into which the positioning pins 154 of the control unit 148 are inserted when the two functional units 148, 150 are joined, in order to ensure exact positioning of the control unit 148 relative to the nozzle unit 150. blind "insertion of the solid conductors 118 in the plug contacts 122 to allow.
  • FIGS. 3A to 3C an assembly of the functional units 148, 150 is shown in perspective.
  • the positioning pins 154 which, as shown in Figure 2B, in this Ausftihrungsbeispiel fixedly connected to the control unit 148, inserted into the positioning holes 156 of the nozzle unit 150.
  • the control unit 148 is positioned relative to the nozzle unit 150, so that both functional units 148, 150 can no longer rotate relative to one another.
  • the plug contacts 122 relative to the upper ends of the solid conductors 118 already have the correct position.
  • FIG. 4 schematically shows a schematic flow chart of a method according to the invention for producing a fuel injector. The illustrated process steps do not necessarily have to be carried out in the sequence shown, and it is also possible to carry out further process steps not shown in FIG. 4.
  • a first functional unit 148 of a fuel injector is produced, which has at least one injector body contact 116 and at least one first electrically controllable valve 111.
  • a second functional unit 150 is produced in method step 414, which has at least one second electrically activatable valve 112 with at least one electrical valve contact 114.
  • a second functionality of this second functional unit 150 in particular an electrical function of the second electrically controllable valve 112, is checked.
  • both functional units 148, 150 are then positioned relative to one another by at least one positioning pin 154.
  • the first functional unit 148 and the second functional unit 150 are reversibly connected to each other at a butt joint 126 by means of at least one non-positive connecting element 152, wherein an electrical connection between the at least one injector body contact 116 and the at least one valve contact 114 is established.

Landscapes

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

Abstract

Lors de la fabrication d'injecteurs de carburant destinés à l'injection directe de carburant dans la chambre de combustion d'un moteur à combustion interne, des soupapes (111, 112) situées à l'intérieur d'un corps d'injecteur (110) doivent être contactées électriquement et commandées par l'extérieur. En général, ceci implique que la fonctionnalité des soupapes (111, 112) peut uniquement être contrôlée après montage complet des injecteurs de carburant. Selon l'invention, l'injecteur de carburant comporte un corps d'injecteur présentant au moins deux unités fonctionnelles (148, 150) séparées, essentiellement indépendantes. Ces unités fonctionnelles (148, 150) sont connectées mutuellement de façon réversible par l'intermédiaire d'un élément de connexion (152) et d'au moins une tige de positionnement (154). Les deux unités fonctionnelles (148, 150) peuvent être fabriquées et testées séparément. De ce fait, le procédé de fabrication et l'entretien des injecteurs de carburant sont simplifiés considérablement et les injecteurs de carburant ainsi fabriqués sont moins sensibles aux parasites.
EP05823893.2A 2005-01-31 2005-12-16 Separation electrique dans des injecteurs de carburant Not-in-force EP1846656B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005004327A DE102005004327A1 (de) 2005-01-31 2005-01-31 Elektrische Trennung in Kraftstoffinjektoren
PCT/EP2005/056850 WO2006081896A1 (fr) 2005-01-31 2005-12-16 Separation electrique dans des injecteurs de carburant

Publications (2)

Publication Number Publication Date
EP1846656A1 true EP1846656A1 (fr) 2007-10-24
EP1846656B1 EP1846656B1 (fr) 2017-04-12

Family

ID=35810302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05823893.2A Not-in-force EP1846656B1 (fr) 2005-01-31 2005-12-16 Separation electrique dans des injecteurs de carburant

Country Status (4)

Country Link
US (1) US7571715B2 (fr)
EP (1) EP1846656B1 (fr)
DE (1) DE102005004327A1 (fr)
WO (1) WO2006081896A1 (fr)

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US8316825B1 (en) * 2008-08-04 2012-11-27 French Iii Jack M Adjustable racing injector
AT510462B1 (de) * 2010-09-22 2014-04-15 Bosch Gmbh Robert Verfahren zum überprüfen und instandsetzen eines kraftstoffinjektors
DE102018007614B4 (de) * 2018-09-25 2023-04-27 Otto-Von-Guericke-Universität Magdeburg Injektor und Verfahren zur Einspritzung von Kraftstoff und einer Zusatzflüssigkeit sowie Verwendung des Injektors
EP3935276A4 (fr) * 2019-04-15 2022-10-19 Cummins, Inc. Injecteur de carburant avec trous de buse orientables radialement utilisant des splines
US11939940B2 (en) 2021-10-04 2024-03-26 Billet Machine And Fabrication, Inc. Fuel injector

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Also Published As

Publication number Publication date
US20080121215A1 (en) 2008-05-29
EP1846656B1 (fr) 2017-04-12
DE102005004327A1 (de) 2006-08-03
WO2006081896A1 (fr) 2006-08-10
US7571715B2 (en) 2009-08-11

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