EP1305521B1 - Common rail system - Google Patents

Common rail system Download PDF

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Publication number
EP1305521B1
EP1305521B1 EP01949255A EP01949255A EP1305521B1 EP 1305521 B1 EP1305521 B1 EP 1305521B1 EP 01949255 A EP01949255 A EP 01949255A EP 01949255 A EP01949255 A EP 01949255A EP 1305521 B1 EP1305521 B1 EP 1305521B1
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EP
European Patent Office
Prior art keywords
common rail
module
rail system
injectors
pressure
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Expired - Lifetime
Application number
EP01949255A
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German (de)
French (fr)
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EP1305521A1 (en
Inventor
Wilhelm Polach
Friedrich Boecking
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1305521A1 publication Critical patent/EP1305521A1/en
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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
    • 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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M63/0005—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 valves actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F2007/0097—Casings, e.g. crankcases or frames for large diesel engines
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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

Definitions

  • the invention relates to a common rail system for Fuel supply for internal combustion engines, in particular Diesel engines of passenger cars, with a central one High pressure fuel accumulator that over High pressure fuel lines with multiple injectors is connected, their opening and closing movements are each controlled by a control device.
  • DE 197 01 879 is a Fuel injection device for large diesel engines known, in which the control valve on the injector is arranged.
  • the injectors with control valve need relatively much space, which is usually in motor vehicles is tight.
  • the object of the invention is a common rail injection system of the type described at the beginning to provide precise control of the Injection time and the injection quantity guaranteed and is suitable for vehicle engines.
  • the fuel injection system according to the invention simple be built and inexpensive to manufacture.
  • the module can be assembled as a whole.
  • the modular Summary of high pressure fuel storage and Control devices delivers over the conventional Assemble the individual components on the engine Advantage that an overall comparison of the common rail system regardless of the engine. Because according to the invention a control device is assigned to each injector, tolerances can vary greatly from injector to injector be restricted. The limitation of tolerances can via control or by mechanical or hydraulic adjustment done.
  • Line routes much shorter than with conventional systems. It can also be used on a variety of plugs to be dispensed with.
  • the sensor can also be pre-assembled become, which leads to a significant simplification in the Assembly of the common rail system according to the invention leads.
  • the sensors are e.g. to sensors for Examination of exhaust gases or charge air. additionally rail pressure sensors can be integrated into the module.
  • control device is a first control valve member between an open Position in which a connection between the High-pressure fuel storage and the controlled injector is open, and a closed position in which the Connection between the high pressure fuel accumulator and the each injector is closed, depending on the pressure in a control chamber axially displaceable in the Module is included, and a second in the module recorded, axially displaceable control valve member includes a connection between the control room and an unpressurized return depending on the position an axially displaceable actuator, in particular one Piezo actuator, releases, and that the axes of the first Control valve member, the second control valve member and of the actuator at a right angle to each other are arranged.
  • Another special embodiment of the invention is characterized in that conventional Nozzle holder combinations can be used as injectors.
  • Conventional nozzle holder combinations have the advantage that they are less expensive to manufacture than pressure controlled common rail injectors.
  • cylinder head 1 shows a section of a cylinder head 1 a motor vehicle engine.
  • the top of the cylinder head 1 is covered by a cylinder head cover 2.
  • a Module 3 of a common rail fuel injection system arranged between the cylinder head cover 2 and the cylinder head 1 .
  • the High-pressure fuel accumulator 4 has the shape of a bore, that stretches into the plane of the drawing. Of the High-pressure fuel accumulator 4 is received High-pressure fuel channel 5 off. The High-pressure fuel channel 5 opens into a bore 6, the Longitudinal axis perpendicular to the longitudinal axis of the High-pressure fuel accumulator 4 is arranged.
  • a high-pressure duct 7 extends from the valve bore 6. Passes through the high-pressure channel 7 at high pressure charged fuel from the High-pressure fuel accumulator 4 to an injection nozzle, the is indicated by an arrow 8. A return from the Injection nozzle (not shown) is designated by 48.
  • a low-pressure channel extends from the valve bore 6 9 out, which opens into a return rail 10.
  • the Low pressure channel 9 is at the end of the blind hole trained valve bore 6 arranged.
  • the open end the valve bore 6 is through a plug 11 locked.
  • the sealing plug 11 limits one Control room 12.
  • On the opposite side is the Control room 12 through the end face of a first Control valve member 13 limits the axially displaceable in the valve bore 6 is received.
  • the control room 12 is through a connecting channel 16 which slants through the first Control valve member 13 extends with the mouth region of the High-pressure fuel channel 5 connected.
  • a first sealing surface 14 and a second sealing surface 15 is formed on that first control valve member 13 . Whichever the sealing surfaces 14 and 15 themselves at their associated seat is in plant, the connection between the ' High-pressure fuel accumulator 4 and the high-pressure channel 7 for Injector open or closed.
  • the axial movement of the first control valve member 13 becomes controlled via the pressure in the control room 12.
  • By the Connection channel 16 arrives at high pressure Fuel from the high-pressure fuel reservoir 4 in the Control room 12.
  • valve ball 17 lifts off its seat, then a connection between the control room 12 and a Low pressure channel 18 released. This has the consequence that the pressure in the control chamber 12 decreases and the Connection between the high-pressure fuel accumulator 4 and the high pressure passage 7 from the first control valve member 13 is released.
  • the valve ball 17 is one at the end Rod 19 attached.
  • the rod 19 forms with the Valve ball 17 together a second control valve member.
  • the Longitudinal axis of the second control valve member is perpendicular to Longitudinal axis of the first control valve member 13 is arranged.
  • the second control valve member is over a first one Booster piston 20 and a second booster piston 21 coupled to a piezo actuator 22 which is shown in FIG is shown.
  • the second control valve member 17, 19 and the first booster piston 20 on one arranged common longitudinal axis. This is perpendicular to it second booster piston 21 arranged on a Longitudinal axis with the piezo actuator 22 is arranged.
  • a sensor 24 is integrated in the module 3.
  • the sensor 24 has an annular space 25 for boost pressure measurement on.
  • the sensor 24 has a sensor 26 Temperature measurement on.
  • a control unit 28 is located on the top of the module 3 attached, as indicated in Figure 1.

Abstract

The invention relates to a common rail system for supplying fuel to internal combustion engines, especially diesel engines of passenger vehicles, comprising a central high pressure fuel accumulator (4) which is connected to several injectors by high pressure fuel lines (5, 7,8), the opening and closing movements of said injectors each being controlled by a control device (13; 17, 19), respectively. The aim of the invention is to provide a common rail system that is suitable for vehicle motors . To this end, the high pressure fuel accumulator (4) and the control devices (13; 17, 19) are combined in one module which is permanently connected to the injectors by high pressure fuel lines (7,8).

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Common-Rail-System zur Kraftstoffversorgung von Brennkraftmaschinen, insbesondere Dieselmotoren von Personenkraftwagen, mit einem zentralen Kraftstoffhochdruckspeicher, der über Kraftstoffhochdruckleitungen mit mehreren Injektoren verbunden ist, deren Öffnungs- und Schließbewegungen jeweils von einer Steuereinrichtung gesteuert werden.The invention relates to a common rail system for Fuel supply for internal combustion engines, in particular Diesel engines of passenger cars, with a central one High pressure fuel accumulator that over High pressure fuel lines with multiple injectors is connected, their opening and closing movements are each controlled by a control device.

In Common-Rail-Einspritzsystemen fördert eine Hochdruckpumpe, eventuell unter Zuhilfenahme einer Vorförderpumpe, den einzuspritzenden Kraftstoff aus einem Kraftstofftank in den zentralen Kraftstoffhochdruckspeicher, der als Common-Rail bezeichnet wird. Von dem Rail führen Kraftstoffleitungen zu den einzelnen Injektoren, die den Zylindern der Brennkraftmaschine zugeordnet sind. Die Injektoren werden in Abhängigkeit von den Betriebsparametern der Brennkraftmaschine einzeln mit Hilfe eines Steuergeräts angesteuert, um Kraftstoff in den Brennraum der Brennkraftmaschine einzuspritzen.In common rail injection systems, one delivers High pressure pump, possibly with the help of a Pre-feed pump, the fuel to be injected from one Fuel tank in the central High-pressure fuel accumulator, known as a common rail becomes. Fuel lines lead from the rail to the individual injectors that hold the cylinders of the Internal combustion engine are assigned. The injectors will depending on the operating parameters of the Internal combustion engine individually using a control unit driven to fuel in the combustion chamber of the Inject internal combustion engine.

Aus der DE 197 01 879 ist eine Kraftstoffeinspritzeinrichtung für Großdieselmotoren bekannt, bei der das Steuerventil jeweils am Injektor angeordnet ist. Die Injektoren mit Steuerventil benötigen relativ viel Bauraum, der bei Kraftfahrzeugen in der Regel knapp bemessen ist.DE 197 01 879 is a Fuel injection device for large diesel engines known, in which the control valve on the injector is arranged. The injectors with control valve need relatively much space, which is usually in motor vehicles is tight.

Aus der DE 43 04 967 A1 und der korrespondierenden US 5,431, 142 ist ein Common-Rail-System zur Kraftstoffversorgung von Brennkraftmaschinen bekannt, mit einem zentralen Kraftstoffhochdruckspeicher, der über Kraftstoffhochdruckleitungen mit mehreren Injektoren verbunden ist, deren Öffnungs- und Schließbewegungen von einer Steuereinrichtung gesteuert werden, wobei der Kraftstoffhochdruckspeicher und die Steuereinrichtung in einem Modul zusammengefasst sind, das über Kraftstoffhochdruckleitungen fest mit den Injektoren verbunden ist. Bei diesem Common-Rail-System wird ein Verteiler benötigt, der nacheinander die verschiedenen Injektoren mit der einen Steuereirichtung verbindet. Die Steuereinrichtung besteht im wesentlichen aus zwei von einem Steuergerät sequentiell angesteuerten Magnetventilen, von denen eines für den Einspritzbeginn und das andere für die Beendigung des Einspritzvorgangs sorgt. Wegen des relativ großen Totvolumens des Verteilers und der sequentiellen Ansteuerung von Magnetventilen können kleinste Einspritzmengen - wenn überhaupt - nicht mit der erforderlichen Genauigkeit zugemessen werden.From DE 43 04 967 A1 and the corresponding US 5,431, 142 is a common rail system for Known fuel supply for internal combustion engines a central high-pressure fuel accumulator that over High pressure fuel lines with multiple injectors is connected, the opening and closing movements of a control device can be controlled, the High-pressure fuel accumulator and the control device in are summarized in a module that is about High pressure fuel lines fixed to the injectors connected is. With this common rail system a Distributor needed, the one after the other Connects injectors with the one control device. The Control device essentially consists of two of a control unit sequentially controlled solenoid valves, one for the start of injection and the other for the completion of the injection process ensures. Because of the relatively large dead volume of the distributor and the sequential control of solenoid valves can smallest injection quantities - if at all - not with the required accuracy can be measured.

Aufgabe der Erfindung ist es, ein Common-Rail-Einspritzsystem der eingangs geschilderten Art bereitzustellen, das eine exakte Steuerung der Einspritzzeit sowie der Einspritzmenge gewährleistet und für Fahrzeugmotoren geeignet ist. Darüber hinaus soll das erfindungsgemäße Kraftstoffeinspritzsystem einfach aufgebaut und kostengünstig herstellbar sein. The object of the invention is a common rail injection system of the type described at the beginning to provide precise control of the Injection time and the injection quantity guaranteed and is suitable for vehicle engines. In addition, the fuel injection system according to the invention simple be built and inexpensive to manufacture.

Die Aufgabe ist bei einem Common-Rail-System zur Kraftstoffversorgung von Brennkraftmaschinen mit den Merkmalen des kennzeichnenden Teils des Anspruchs 1 gelöst.The task is for a common rail system Fuel supply for internal combustion engines with the Features of the characterizing part of claim 1 solved.

Vorteile der ErfindungAdvantages of the invention

Das Modul kann als Ganzes montiert werden. Die modulare Zusammenfassung von Kraftstoffhochdruckspeicher und Steuereinrichtungen liefert gegenüber dem herkömmlichen Zusammenbauen der einzelnen Komponenten am Motor den Vorteil, dass ein Gesamtabgleich des Common-Rail-Systems unabhängig vom Motor ermöglicht wird. Da erfindungsgemäß jedem injektor eine Steuereinrichtung zugeordnet ist, können die Toleranzen von Injektor zu Injektor stark eingeschränkt werden. Die Einschränkung der Toleranzen kann über die Ansteuerung oder durch mechanische bzw. hydraulische Anpassung erfolgen.The module can be assembled as a whole. The modular Summary of high pressure fuel storage and Control devices delivers over the conventional Assemble the individual components on the engine Advantage that an overall comparison of the common rail system regardless of the engine. Because according to the invention a control device is assigned to each injector, tolerances can vary greatly from injector to injector be restricted. The limitation of tolerances can via control or by mechanical or hydraulic adjustment done.

Außerdem sind die zu überbrückenden In addition, those to be bridged

Leitungswege viel kürzer als bei herkömmlichen Systemen. Darüber hinaus kann auf eine Vielzahl von Steckern verzichtet werden.Line routes much shorter than with conventional systems. It can also be used on a variety of plugs to be dispensed with.

Eine besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass mindestens ein Sensor in das Modul integriert ist. Der Sensor kann ebenfalls vormontiert werden, was zu einer erheblichen Vereinfachung in der Montage des erfindungsgemäßen Common-Rail-Systems führt. Bei den Sensoren handelt es sich z.B. um Sensoren zur Untersuchung der Abgase oder der Ladeluft. Zusätzlich können Raildrucksensoren in das Modul integriert werden.This is a special embodiment of the invention characterized that at least one sensor in the module is integrated. The sensor can also be pre-assembled become, which leads to a significant simplification in the Assembly of the common rail system according to the invention leads. The sensors are e.g. to sensors for Examination of exhaust gases or charge air. additionally rail pressure sensors can be integrated into the module.

Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass die Steuereinrichtung ein erstes Steuerventilglied, das zwischen einer geöffneten Stellung, in der eine Verbindung zwischen dem Kraftstoffhochdruckspeicher und dem angesteuerten Injektor geöffnet ist, und einer geschlossenen Stellung, in der die Verbindung zwischen dem Kraftstoffhochdruckspeicher und dem jeweiligen Injektor geschlossen ist, in Abhängigkeit von dem Druck in einem Steuerraum axial verschiebbar in dem Modul aufgenommen ist, und ein zweites in dem Modul aufgenommenes, axial verschiebbares Steuerventilglied umfasst, das eine Verbindung zwischen dem Steuerraum und einem drucklosen Rücklauf in Abhängigkeit von der Stellung eines axial verschiebbaren Aktors, inbesondere eines Piezoaktors, freigibt, und dass die Achsen des ersten Steuerventilgliedes, des zweiten Steuerventilgliedes und des Aktors jeweils in einem rechten Winkel zueinander angeordnet sind. Dadurch ergibt sich ein äußerst kompaktes, druckgesteuertes Common-Rail-Einspritzsystem, das nur wenig Bauraum benötigt.Another special embodiment of the invention is characterized in that the control device is a first control valve member between an open Position in which a connection between the High-pressure fuel storage and the controlled injector is open, and a closed position in which the Connection between the high pressure fuel accumulator and the each injector is closed, depending on the pressure in a control chamber axially displaceable in the Module is included, and a second in the module recorded, axially displaceable control valve member includes a connection between the control room and an unpressurized return depending on the position an axially displaceable actuator, in particular one Piezo actuator, releases, and that the axes of the first Control valve member, the second control valve member and of the actuator at a right angle to each other are arranged. This results in an extremely compact, pressure-controlled common rail injection system that does little Installation space required.

Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass herkömmliche Düsenhalterkombinationen als Injektoren verwendet werden. Herkömmliche Düsenhalterkombinationen haben den Vorteil, dass sie in der Herstellung kostengünstiger sind als druckgesteuerte Common-Rail-Injektoren.Another special embodiment of the invention is characterized in that conventional Nozzle holder combinations can be used as injectors. Conventional nozzle holder combinations have the advantage that they are less expensive to manufacture than pressure controlled common rail injectors.

Bei einer Brennkraftmaschine mit einem Zylinderkopf und einem Zylinderkopfdeckel ist die oben angegebene Aufgabe dadurch gelöst, dass ein vorab beschriebenes Modul zwischen dem Zylinderkopf und dem Zylinderkopfdeckel montiert ist. Durch die sich daraus ergebende kompakte Bauform ergibt sich ein ansprechender ästhetischer Gesamteindruck der Brennkraftmaschine.In an internal combustion engine with a cylinder head and a cylinder head cover is the task specified above solved in that a previously described module between the cylinder head and the cylinder head cover is mounted. Due to the resulting compact design an appealing overall aesthetic impression of Internal combustion engine.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein Ausführungsbeispiel der Erfindung im Einzelnen beschrieben ist. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein.Further advantages, features and details of the invention result from the following description, in which with reference to the drawing an embodiment the invention is described in detail. You can those mentioned in the claims and in the description Features individually for themselves or in any Combination be essential to the invention.

Zeichnungdrawing

In der Zeichnung zeigen:

Figur 1
die Ansicht eines Längsschnitts durch ein erfindungsgemäßes Common-Rail-System; und
Figur 2
die Ansicht eines Schnitts entlang der Linie II-II in Figur 1.
The drawing shows:
Figure 1
the view of a longitudinal section through a common rail system according to the invention; and
Figure 2
the view of a section along the line II-II in Figure 1.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 sieht man einen Ausschnitt eines Zylinderkopfs 1 eines Kraftfahrzeugmotors. Die Oberseite des Zylinderkopfs 1 ist durch einen Zylinderkopfdeckel 2 abgedeckt. Zwischen dem Zylinderkopfdeckel 2 und dem Zylinderkopf 1 ist ein Modul 3 eines Common-Rail-Kraftstoffeinspritzsystems angeordnet.1 shows a section of a cylinder head 1 a motor vehicle engine. The top of the cylinder head 1 is covered by a cylinder head cover 2. Between the cylinder head cover 2 and the cylinder head 1 is a Module 3 of a common rail fuel injection system arranged.

In dem Modul 3 ist ein zentraler Kraftstoffhochdruckspeicher 4 ausgebildet. Der Kraftstoffhochdruckspeicher 4 hat die Form einer Bohrung, die sich in die Zeichenebene hineinerstreckt. Von dem Kraftstoffhochdruckspeicher 4 geht ein Kraftstoffhochdruckkanal 5 aus. Der Kraftstoffhochdruckkanal 5 mündet in eine Bohrung 6, deren Längsachse senkrecht zu der Längsachse des Kraftstoffhochdruckspeichers 4 angeordnet ist.In module 3 there is a central one High-pressure fuel accumulator 4 formed. The High-pressure fuel accumulator 4 has the shape of a bore, that stretches into the plane of the drawing. Of the High-pressure fuel accumulator 4 is received High-pressure fuel channel 5 off. The High-pressure fuel channel 5 opens into a bore 6, the Longitudinal axis perpendicular to the longitudinal axis of the High-pressure fuel accumulator 4 is arranged.

Von der Ventilbohrung 6 geht ein Hochdruckkanal 7 aus. Durch den Hochdruckkanal 7 gelangt mit Hochdruck beaufschlagter Kraftstoff aus dem Kraftstoffhochdruckspeicher 4 zu einer Einspritzdüse, die durch einen Pfeil 8 angedeutet ist. Ein Rücklauf von der (nicht dargestellten) Einspritzdüse ist mit 48 bezeichnet.A high-pressure duct 7 extends from the valve bore 6. Passes through the high-pressure channel 7 at high pressure charged fuel from the High-pressure fuel accumulator 4 to an injection nozzle, the is indicated by an arrow 8. A return from the Injection nozzle (not shown) is designated by 48.

Außerdem geht von der Ventilbohrung 6 ein Niederdruckkanal 9 aus, der in ein Rücklaufrail 10 mündet. Der Niederdruckkanal 9 ist am Ende der als Sackloch ausgebildeten Ventilbohrung 6 angeordnet. Das offene Ende der Ventilbohrung 6 ist durch einen Verschlussstopfen 11 verschlossen. Der Verschlussstopfen 11 begrenzt einen Steuerraum 12. Auf der gegenüberliegenden Seite wird der Steuerraum 12 durch die Stirnfläche eines ersten Steuerventilglieds 13 begrenzt, das axial verschiebbar in der Ventilbohrung 6 aufgenommen ist. Der Steuerraum 12 ist durch einen Verbindungskanal 16, der schräg durch das erste Steuerventilglied 13 verläuft, mit dem Mündungsbereich des Kraftstoffhochdruckkanals 5 verbunden. Außerdem sind an dem ersten Steuerventilglied 13 eine erste Dichtfläche 14 und eine zweite Dichtfläche 15 ausgebildet. Je nachdem, welche der Dichtflächen 14 und 15 sich an ihrem zugehörigen Sitz in Anlage befindet, ist die Verbindung zwischen dem' Kraftstoffhochdruckspeicher 4 und dem Hochdruckkanal 7 zur Einspritzdüse geöffnet oder geschlossen.In addition, a low-pressure channel extends from the valve bore 6 9 out, which opens into a return rail 10. The Low pressure channel 9 is at the end of the blind hole trained valve bore 6 arranged. The open end the valve bore 6 is through a plug 11 locked. The sealing plug 11 limits one Control room 12. On the opposite side is the Control room 12 through the end face of a first Control valve member 13 limits the axially displaceable in the valve bore 6 is received. The control room 12 is through a connecting channel 16 which slants through the first Control valve member 13 extends with the mouth region of the High-pressure fuel channel 5 connected. Also on that first control valve member 13 a first sealing surface 14 and a second sealing surface 15 is formed. Whichever the sealing surfaces 14 and 15 themselves at their associated seat is in plant, the connection between the ' High-pressure fuel accumulator 4 and the high-pressure channel 7 for Injector open or closed.

Die axiale Bewegung des ersten Steuerventilglieds 13 wird über den Druck in dem Steuerraum 12 gesteuert. Durch den Verbindungskanal 16 gelangt mit Hochdruck beaufschlagter Kraftstoff aus dem Kraftstoffhochdruckspeicher 4 in den Steuerraum 12.The axial movement of the first control valve member 13 becomes controlled via the pressure in the control room 12. By the Connection channel 16 arrives at high pressure Fuel from the high-pressure fuel reservoir 4 in the Control room 12.

Wenn eine Ventilkugel 17 von ihrem Sitz abhebt, dann wird eine Verbindung zwischen dem Steuerraum 12 und einem Niederdruckkanal 18 freigegeben. Das hat dann zur Folge, dass der Druck in dem Steuerraum 12 abnimmt und die Verbindung zwischen dem Kraftstoffhochdruckspeicher 4 und dem Hochdruckkanal 7 von dem ersten Steuerventilglied 13 freigegeben wird. Die Ventilkugel 17 ist am Ende einer Stange 19 befestigt. Die Stange 19 bildet mit der Ventilkugel 17 zusammen ein zweites Steuerventilglied. Die Längsachse des zweiten Steuerventilglieds ist senkrecht zur Längsachse des ersten Steuerventilglieds 13 angeordnet.If a valve ball 17 lifts off its seat, then a connection between the control room 12 and a Low pressure channel 18 released. This has the consequence that the pressure in the control chamber 12 decreases and the Connection between the high-pressure fuel accumulator 4 and the high pressure passage 7 from the first control valve member 13 is released. The valve ball 17 is one at the end Rod 19 attached. The rod 19 forms with the Valve ball 17 together a second control valve member. The Longitudinal axis of the second control valve member is perpendicular to Longitudinal axis of the first control valve member 13 is arranged.

Das zweite Steuerventilglied ist über einen ersten Übersetzerkolben 20 und einen zweiten Übersetzerkolben 21 mit einem Piezoaktor 22 gekoppelt, der in Figur 2 dargestellt ist. Dabei sind das zweite Steuerventilglied 17, 19 und der erste Übersetzerkolben 20 auf einer gemeinsamen Längsachse angeordnet. Senkrecht dazu ist der zweite Übersetzerkolben 21 angeordnet, der auf einer Längsachse mit dem Piezoaktor 22 angeordnet ist.The second control valve member is over a first one Booster piston 20 and a second booster piston 21 coupled to a piezo actuator 22 which is shown in FIG is shown. The second control valve member 17, 19 and the first booster piston 20 on one arranged common longitudinal axis. This is perpendicular to it second booster piston 21 arranged on a Longitudinal axis with the piezo actuator 22 is arranged.

Schließlich ist in das Modul 3 ein Sensor 24 integriert. Der Sensor 24 weist einen Ringraum 25 zur Ladedruckmessung auf. Darüber hinaus weist der Sensor 24 einen Fühler 26 zur Temperaturmessung auf. Finally, a sensor 24 is integrated in the module 3. The sensor 24 has an annular space 25 for boost pressure measurement on. In addition, the sensor 24 has a sensor 26 Temperature measurement on.

Auf der Oberseite des Moduls 3 ist ein Steuergerät 28 aufgesetzt, wie in Figur 1 angedeutet ist.A control unit 28 is located on the top of the module 3 attached, as indicated in Figure 1.

Claims (5)

  1. Common rail system for supplying fuel to internal combustion engines, in particular diesel engines of passenger cars, having a central fuel high-pressure accumulator (4) which is connected to a plurality of injectors via fuel high-pressure lines (5, 7), the opening and closing movements of said injectors being controlled by a control device and the fuel high-pressure accumulator (4) and the control device being combined in a module which is permanently connected to the injectors via fuel high-pressure lines (5, 7), characterized in that the opening and closing movements are controlled by one control device (13; 17, 19) per injector.
  2. Common rail system according to Claim 1, characterized in that at least one sensor (24) is integrated into the module (3).
  3. Common rail system according to one of the preceding claims, characterized in that the control device comprises a first control valve element (13) which is accommodated in the module (3) between an opened position, in which a connection between the fuel high-pressure accumulator (4) and the actuated injector is opened, and a closed position, in which the connection between the fuel high-pressure accumulator (4) and the respective injector is closed, so as to be axially displaceable as a function of the pressure in a control space (12), and comprises a second axially displaceable control valve element (17, 19) which is accommodated in the module (3) and clears a connection between the control space (12) and a pressureless return line (18) as a function of the position of an axially displaceable actuator (22), in particular of a piezo actuator, and in that the longitudinal axes of the first control valve element (13), of the second control valve element (17, 19) and of the actuator (22) are each arranged at a right angle to one another.
  4. Common rail system according to one of the preceding claims, characterized in that conventional nozzle holder combinations are used as injectors.
  5. Internal combustion engine having a cylinder head (1) and a cylinder head cover (2), characterized in that a module (3) according to one of the preceding claims is mounted between the cylinder head (1) and the cylinder head cover (2).
EP01949255A 2000-06-29 2001-06-12 Common rail system Expired - Lifetime EP1305521B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10031733 2000-06-29
DE10031733A DE10031733A1 (en) 2000-06-29 2000-06-29 Common Rail System
PCT/DE2001/002179 WO2002001068A1 (en) 2000-06-29 2001-06-12 Common rail system

Publications (2)

Publication Number Publication Date
EP1305521A1 EP1305521A1 (en) 2003-05-02
EP1305521B1 true EP1305521B1 (en) 2004-09-22

Family

ID=7647239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01949255A Expired - Lifetime EP1305521B1 (en) 2000-06-29 2001-06-12 Common rail system

Country Status (5)

Country Link
US (1) US20020170528A1 (en)
EP (1) EP1305521B1 (en)
JP (1) JP2004502077A (en)
DE (2) DE10031733A1 (en)
WO (1) WO2002001068A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983855A (en) * 1973-07-12 1976-10-05 C.A.V. Limited Fuel injection system
GB2102882B (en) * 1981-07-24 1985-09-11 Lucas Ind Plc Combined fuel injection pump and injector units for c.i. engines
DE3633136A1 (en) * 1986-09-30 1988-04-07 Daimler Benz Ag MAGNETIC VALVE-CONTROLLED INJECTION DEVICE FOR PUMP AND NOZZLE FOR AIR COMPRESSING ENGINES
JP2636379B2 (en) * 1988-11-07 1997-07-30 トヨタ自動車株式会社 Fuel injection device
US5036824A (en) * 1989-06-21 1991-08-06 General Motors Corporation Fuel injection
RU2085757C1 (en) * 1991-10-11 1997-07-27 Катерпиллар Инк. Valve and actuator unit for hydraulically operated nozzle with electronic control
JPH06257529A (en) * 1993-02-18 1994-09-13 Robert Bosch Gmbh Fuel injector for internal combustion engine
US5325834A (en) * 1993-08-03 1994-07-05 Caterpillar Inc. Method of and conversion kit for converting an engine to hydraulically-actuated fuel injection system
DE9410232U1 (en) * 1994-06-27 1995-11-02 Bosch Gmbh Robert Fuel injection device for internal combustion engines
DE19701879A1 (en) * 1997-01-21 1998-07-23 Bosch Gmbh Robert Fuel injection device for internal combustion engines
DE19716221B4 (en) * 1997-04-18 2007-06-21 Robert Bosch Gmbh Fuel injection device with pre-injection and main injection in internal combustion engines, in particular for hard to ignite fuels
DE19742073A1 (en) * 1997-09-24 1999-03-25 Bosch Gmbh Robert Fuel injection arrangement for internal combustion engines
DE19750298A1 (en) * 1997-11-13 1999-05-20 Man Nutzfahrzeuge Ag Internal combustion motor fuel injection for diesel motors in common rail system
US6102004A (en) * 1997-12-19 2000-08-15 Caterpillar, Inc. Electronic control for a hydraulically activated, electronically controlled injector fuel system and method for operating same
US6260537B1 (en) * 1998-02-20 2001-07-17 Delphi Technologies, Inc. Side feed fuel injector and integrated fuel rail/intake manifold
DE19812170A1 (en) * 1998-03-19 1999-09-23 Daimler Chrysler Ag Fuel injection system for multicylinder internal combustion engine

Also Published As

Publication number Publication date
DE10031733A1 (en) 2002-01-17
US20020170528A1 (en) 2002-11-21
DE50103785D1 (en) 2004-10-28
EP1305521A1 (en) 2003-05-02
JP2004502077A (en) 2004-01-22
WO2002001068A1 (en) 2002-01-03

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