EP0204722A1 - Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion interne. - Google Patents

Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion interne.

Info

Publication number
EP0204722A1
EP0204722A1 EP85905504A EP85905504A EP0204722A1 EP 0204722 A1 EP0204722 A1 EP 0204722A1 EP 85905504 A EP85905504 A EP 85905504A EP 85905504 A EP85905504 A EP 85905504A EP 0204722 A1 EP0204722 A1 EP 0204722A1
Authority
EP
European Patent Office
Prior art keywords
wire
fuel
tension wire
valve
closing
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
EP85905504A
Other languages
German (de)
English (en)
Other versions
EP0204722B1 (fr
Inventor
Rudolf Babitzka
Ernst Linder
Wilhelm Polach
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 EP0204722A1 publication Critical patent/EP0204722A1/fr
Application granted granted Critical
Publication of EP0204722B1 publication Critical patent/EP0204722B1/fr
Expired legal-status Critical Current

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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift

Definitions

  • the invention relates to a device for injecting fuel according to the preamble of the main claim.
  • the closing force of the closing spring element can be changed by axially shifting its support shoulder fixed to the housing, but this requires relatively expensive means.
  • devices of the generic type are known (DE-A1-33 44 396.3), in which the injection is briefly interrupted in each case in a specific area of the operating map to form a clearly separated pre-injection phase. With these devices, it is relatively difficult to correctly coordinate the parameters influencing the course of the injection.
  • the prior art also includes injection nozzles (DE-OS 15 7/6 570), which have an elongated tension wire as a closing spring element. With this design of the closing spring element, a high natural frequency of the oscillatory system formed from the valve closing member and closing spring element can be achieved, but the closing force of the tensioning wire can only be adjusted, but not changed during operation of the machine. Advantages of the invention
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the opening pressure of the injection nozzle or the injection course can be changed during the operation with simple or precisely controllable means. In addition, there is a high spring stiffness of the closing spring element.
  • a design which does not require any additional mechanical means results if the electrical resistance element is formed by the tension wire itself and the current passage through the tension wire can be changed by a value which influences its closing force, or can be controlled according to a predetermined law.
  • the opening pressure of the injection nozzle can be regulated if the injection nozzle is provided with a sensor which detects the opening pressure and, if appropriate, a sensor which detects the lifting of the valve closing member from the valve seat.
  • This second sensor can be a switch, which is formed by the valve closing member and the valve seat itself, and which can advantageously serve at the same time as an injection start or injection timer for an evaluation circuit.
  • the course of the injection itself can be influenced or shaped by temporary intervention in accordance with a specific law if the electrical resistance element that changes the pretension of the tensioning wire is the coil of a magnet, the armature of which is coupled to the tensioning wire and during its tightening movement in the closing direction acts on the tension wire.
  • FIG. 1 shows the injection nozzle of the first embodiment in a longitudinal section with the circuits for the electrical functions of the device
  • FIG. 2 shows a partial longitudinal section through the injection nozzle according to the second embodiment
  • FIG. 3 shows a functional diagram of the injection nozzle according to FIG. 2.
  • the injection nozzle according to FIG. 1 has a nozzle body 10 which is provided with a continuous longitudinal bore 12 which merges into an outwardly directed conical valve seat 14 on the combustion chamber side.
  • Longitudinal bore 12 extends a tension wire 16 which is fixedly connected to a conical valve closing member 18 and forms the closing spring. At the other end, the tensioning wire 16 is firmly connected to a larger-diameter bolt 20, which at the same time serves to support the housing and to make electrical contact with the tensioning wire 16.
  • a support disk 22 made of electrically insulating material is provided for support, which in turn is supported on the upper end face of the nozzle body 10 via an intermediate disk 24.
  • the bolt 20 preferably has a thickened head 26 with a spherically curved surface, which lies in a correspondingly shaped recess in the support disk 22.
  • the nozzle body 10 is firmly and tightly connected to a nozzle holder 30 which is provided with a central bore 32 which merges on the input side into a threaded section into which a connecting piece 34 for a fuel supply line is screwed. Starting at the end, the bore 32 merges into a section with a larger diameter, which is surrounded by a flanged collar 36 of the nozzle holder 30 which detects the nozzle body 10. With this arrangement, a fuel-filled chamber 38 is formed in the interior of the nozzle holder 30 and does not have to be marked breakthroughs in the support plate 22 and the intermediate plate 24 is connected to the longitudinal bore 12 leading to the valve seat 14.
  • the bolt 20 fastened to the tensioning wire 16 is made of electrically conductive material and is contacted with a connecting pin 40 which is led out laterally from the chamber 38 in a pressure-tight manner.
  • the housing of the injection nozzle consisting of the nozzle body 10, the nozzle holder 30 and the connecting piece 34 is provided with a second connecting pin 42. Both connecting points 40, 42 are surrounded by a protective capsule 44 which is captively placed on a lateral elevation 46 of the nozzle holder 30.
  • a receptacle for a pressure sensor 48 which detects the fuel pressure in the chamber 38 and reports it as an electrical signal to a regulator 50, is also provided on the nozzle holder 30 offset by 90 to increase 46.
  • the controller 50 is connected to a circuit 52 of a current source 54, which leads over the tension wire 16 and the parts 14, 18 of the valve formed at the nozzle opening acting as a switch.
  • the current flowing in the circuit 52 heats the tension wire 16, its pretensioning or closing force changing with the current strength.
  • the controller 50 regulates the current intensity in accordance with the speed n and a parameter p e which signals the load on the machine, the actual value of the fuel pressure in the injection nozzle being continuously reported back to the controller 50.
  • the control range is expediently chosen so that there are temperature influences from nozzles body 10 and the fuel located in the longitudinal bore 12 have as little effect on the quality of the control.
  • An evaluation circuit 56 for the signal pulses generated by opening and closing the valve 14, 18 at the nozzle opening is also connected to the circuit 52 in a suitable manner. These signal pulses can be evaluated to determine the start of spraying or the spraying duration in the various operating states. Furthermore, the signal pulse produced when the valve is opened, in cooperation with the pressure sensor 48, is used to precisely determine the fuel opening pressure p ö in devices in which the fuel pressure rises even further after the valve is opened.
  • a simple embodiment of the injection nozzle was chosen as the exemplary embodiment.
  • the support disk 22 could also be supported on the nozzle body 10 by means of a correspondingly preloaded helical spring.
  • the bolt 20 could also be connected to the tensioning wire 16 in an axially adjustable manner.
  • the injection nozzle according to FIG. 2 has a nozzle body 60 with a central longitudinal bore 62 which, like the longitudinal bore 12 according to FIG. 1, merges into an outwardly directed conical valve seat on the combustion chamber side.
  • a tensioning wire 64 extends through the longitudinal bore 62 and is connected to the valve closing member and the latter Closing spring forms. At the other end, the tensioning wire 64 is firmly connected to a larger-diameter bolt 66, which is supported on a shoulder 72 of the nozzle body 60 via an armature disk 68 of an electromagnet 70.
  • the shoulder 72 is formed at the transition from the longitudinal bore 62 into a larger bore 74 in an enlarged head part 76 of the nozzle body 60, which receives the electromagnet 70.
  • the fuel is guided laterally through a connecting piece 78 and a transverse bore 80 into the longitudinal bore 62 and through this to the valve seat and to the ejection opening.
  • the electromagnet 70 has a coil 82 which is connected to a control circuit via connection contacts 84, 86.
  • the connection contacts 84, 86 are electrically insulated and pressure-tight; passed through a disk 88 which is screwed into the head part 76.
  • the disk 88 presses the housing of the electromagnet 70 against a shoulder 90 of the head part 76, these parts also being sealed pressure-tight to the outside by suitable means.
  • the excited electromagnet 70 exerts on the armature disk
  • Valve adds to the biasing force of the tension wire 64.
  • the opening pressure p ö of the injection nozzle can be changed in the desired sense or can be varied if the electromagnet 70 is designed accordingly.
  • the electromagnet 70 receives a variable current pulse shortly after the start of the injection, as a result of which, depending on the length of the pulse, the injection is temporarily throttled until completely interrupted and only fully resumes after the magnetic disk 68 has dropped.
  • FIG. 3 shows such an injection curve as a function of the injection quantity q over time t, 3 different curves illustrating the influence of the pulse length for the start of injection.

Landscapes

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

Abstract

Le dispositif comprend un fil tendu (16, 64) qui ferme élastiquement une soupape (18) qui s'ouvre vers l'extérieur. La tension de précontrainte du fil tendu (16, 64) dépend du courant d'un circuit électrique (52) qui traverse un élément résistant électrique (16, 82) incorporé dans le gicleur. L'élément résistant peut être constitué par le fil (16) lui-même ou par la bobine (82) d'un électro-aimant (70) dont l'armature (68) est couplée avec le fil tendu (64). Ainsi la pression d'ouverture (poe) du gicleur et son fonctionnement peuvent être facilement commandés et suivre une loi prédéterminée.
EP85905504A 1984-11-10 1985-10-25 Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion interne Expired EP0204722B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3441140 1984-11-10
DE19843441140 DE3441140A1 (de) 1984-11-10 1984-11-10 Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0204722A1 true EP0204722A1 (fr) 1986-12-17
EP0204722B1 EP0204722B1 (fr) 1989-07-26

Family

ID=6249999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85905504A Expired EP0204722B1 (fr) 1984-11-10 1985-10-25 Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion interne

Country Status (5)

Country Link
US (1) US4779596A (fr)
EP (1) EP0204722B1 (fr)
JP (1) JPS62500733A (fr)
DE (2) DE3441140A1 (fr)
WO (1) WO1986002979A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3936619A1 (de) * 1989-11-03 1991-05-08 Man Nutzfahrzeuge Ag Verfahren zum einspritzen eines brennstoffes in einen brennraum einer luftverdichtenden, selbstzuendenden brennkraftmaschine, sowie vorrichtungen zur durchfuehrung dieses verfahrens
US5329908A (en) * 1993-06-08 1994-07-19 Cummins Engine Company, Inc. Compressed natural gas injection system for gaseous fueled engines
DE4325904C2 (de) * 1993-08-02 1995-07-20 Daimler Benz Ag Für eine Dieselbrennkraftmaschine vorgesehene Kraftstoffeinspritzanlage mit einer den Kraftstoff fördernden Hochdruckpumpe in eine gemeinsame Versorgungsleitung (Common-Rail) für alle Einspritzdüsen
DE19618698A1 (de) * 1996-05-09 1997-11-13 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
US5986871A (en) * 1997-11-04 1999-11-16 Caterpillar Inc. Method of operating a fuel injector
JP5383132B2 (ja) * 2008-03-28 2014-01-08 株式会社デンソー 燃圧センサ搭載構造、燃圧検出システム、燃料噴射装置、それに用いられる圧力検出装置及び蓄圧式燃料噴射装置システム
JP5154495B2 (ja) 2009-04-03 2013-02-27 株式会社日本自動車部品総合研究所 燃料噴射弁及び燃料噴射弁の内部電気接続方法
CA2832055A1 (fr) * 2009-08-27 2011-03-24 Mcalister Technologies, Llc Isolateur ceramique et ses procedes d'utilisation et de fabrication
EP2470773B1 (fr) * 2009-08-27 2015-04-29 McAlister Technologies, LLC Injecteur de carburant avec senseur pour la detection de combustion

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE711940C (de) * 1938-06-25 1941-10-09 Rudolf L Orange Dipl Ing Selbstaetige Nadelduese
GB622224A (en) * 1946-05-07 1949-04-28 Robert Francis Darling Improvements in or relating to stop valves, particularly applicable to oil sprayers for liquid fuel burners
US3442456A (en) * 1966-11-01 1969-05-06 Holley Carburetor Co Injection nozzle
US3791408A (en) * 1972-05-31 1974-02-12 Yuken Kogyo Co Ltd Electromagnetic pressure-telecontrolling valve
DE2508390A1 (de) * 1975-02-26 1976-09-09 Bosch Gmbh Robert Einspritz-magnetventil
US4275693A (en) * 1977-12-21 1981-06-30 Leckie William H Fuel injection timing and control apparatus
GB2054033A (en) * 1979-07-20 1981-02-11 Lucas Industries Ltd I.C. engine fuel injection nozzle
DE3008619A1 (de) * 1980-03-06 1981-09-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzventil fuer brennkraftmaschinen
JPS56159530A (en) * 1980-05-13 1981-12-08 Diesel Kiki Co Ltd Injection controller for fuel injection valve of internal- combustion engine
JPS575526A (en) * 1980-06-11 1982-01-12 Diesel Kiki Co Ltd Method of detecting injection flow in fuel injection valve
JPS59101575A (ja) * 1982-12-01 1984-06-12 Diesel Kiki Co Ltd 内燃機関用燃料噴射弁
US4640252A (en) * 1984-01-28 1987-02-03 Mazda Motor Corporation Fuel injection system for diesel engine
JPS60204961A (ja) * 1984-03-29 1985-10-16 Mazda Motor Corp デイ−ゼルエンジンの燃料噴射装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8602979A1 *

Also Published As

Publication number Publication date
JPS62500733A (ja) 1987-03-26
DE3441140A1 (de) 1986-05-15
US4779596A (en) 1988-10-25
EP0204722B1 (fr) 1989-07-26
WO1986002979A1 (fr) 1986-05-22
DE3571855D1 (en) 1989-08-31

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