EP1334271B1 - Lift and/or pressure-controlled injector with a double slide - Google Patents
Lift and/or pressure-controlled injector with a double slide Download PDFInfo
- Publication number
- EP1334271B1 EP1334271B1 EP01992832A EP01992832A EP1334271B1 EP 1334271 B1 EP1334271 B1 EP 1334271B1 EP 01992832 A EP01992832 A EP 01992832A EP 01992832 A EP01992832 A EP 01992832A EP 1334271 B1 EP1334271 B1 EP 1334271B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injector
- pressure
- injector body
- housing
- slide
- 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.)
- Expired - Lifetime
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Classifications
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- 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
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- 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
- F02M47/025—Hydraulically actuated valves draining the chamber to release the closing pressure
Definitions
- High-pressure storage systems are used today in injection systems on direct-injection internal combustion engines. These have the task of storing the fuel under high pressure. Pressure fluctuations that may arise from the pumping movement and the injection process are to be dampened by the fuel volume contained in the high-pressure accumulator.
- the fuel is injected into the combustion chambers of the internal combustion engines by means of injectors. Start of injection and injection quantity are set on the injectors; these are preferably arranged on the cylinder head of an internal combustion engine.
- EP 1 036 931 A2 relates to a fuel injector arrangement with a nozzle which contains a first bore in which a nozzle needle is slidably mounted.
- the needle cooperates with a seat to control the flow of fuel from a supply chamber to an outlet opening, with an area associated with the needle being exposed to fuel pressure in a control room.
- a control valve that can be operated with fuel pressure controls the supply of fuel to the supply chamber.
- a piston is slidably disposed in the control valve ( Figure 5).
- DE 198 35 494 A1 relates to a pump nozzle unit. This serves to supply fuel to a combustion chamber of direct-injection internal combustion engines with a pump unit for building up an injection pressure. Injectors are provided for injecting the fuel into the combustion chamber.
- the system further comprises a control unit with a control valve, which is designed as an outward opening A valve.
- a valve actuation unit for controlling the pressure build-up in the pump unit is also included.
- an injector design can be achieved in an advantageous manner, which enables both stroke control of the injector body and its pressure control. This allows the latest requirements from the requirements of commercial vehicle engine manufacturers to be taken into account, which require injector control according to two separate principles in order to be able to operate the internal combustion engine at the optimum operating point at all times.
- the configuration of the 3/2-way valve via the stroke of the 3/2-way valve can suddenly relieve the pressure in the nozzle space of the injection nozzle.
- the sudden relief of the nozzle space causes pressure control of the injector in this operating state.
- the sudden relief of the nozzle space takes place when the valve body is controlled in the injector housing, covering the full stroke; if, on the other hand, the injector is operated in partial pressure, one of the slides formed in the injector body can also be closed, while the other slider formed in the injector body is open at its control edge and thus permits a stroke , so that a transition from stroke to pressure control and vice versa of the injector can be achieved in a simple manner and the vertical position of the injector body is defined relative to the injector housing.
- the vertical movement of the injector body in the housing of the injector takes place by means of a piezo actuator provided at one end of the valve body or another electrical actuating element with which the individual slider / control edge combination can be closed or opened differently under the influence of the shortest response times.
- Solenoid valves or piezo actuators can advantageously be used as actuators to relieve the pressure in the control room.
- the single figure shows a longitudinal section through an injector through a 3/2-way valve, on the injector body of which two slide edges offset from one another in the vertical direction are formed.
- the illustration according to the single figure shows the longitudinal section through an injector body on which two-slide / control edges are formed.
- the injector 1 shown in the illustration according to FIG. 1 for injecting fuel under high pressure into the combustion chambers of an internal combustion engine is part of an injection system which comprises a high-pressure plenum (common rail).
- a high-pressure plenum common rail
- the fuel is kept at an extremely high pressure level by means of a pump in order to use the fuel volume in the pump chamber as a damping element for pressure flushing induced by the pump movement or pressure oscillation induced by the movement of the injector in the line system.
- the injector 1 resulting from the illustration according to FIG. 1 essentially comprises an injector body 3 which can be moved vertically in a housing 2.
- the injector body 3 is embedded as a rotationally symmetrical component in a bore in the housing 2.
- a push rod element 4 is arranged opposite this, which is opposite a piston 16, which in turn interacts with a control chamber 15 formed in the injector body 3.
- control chamber 6 On the upper side of the injector body 3 as shown in FIG. 1 there is a control chamber 6, the upper cylindrical end face of which is opposite.
- the control chamber 6 is constantly supplied with fuel under high pressure via a branch 8, so that it is ensured that always one there is sufficient tax amount of fuel in the upper control chamber 6.
- a throttle element is let into the supply line 8, which on the one hand opens into the upper control chamber 6 and on the other hand branches off from the high-pressure plenum inlet.
- the upper control chamber 6 can be relieved of pressure via a relief opening 7, to which an outlet throttle 9 connects.
- the pressure relief of the upper control chamber 6 and thus the induction of the vertical upward and downward movement of the injector body 3 in the housing 2 of the injector takes place by the control of an actuator element 10, which can be designed, for example, as a solenoid valve or as a piezo actuator and the pressure on the controls as a closing element ball element. If the spherical element acting as the closing element is relieved of pressure, its seating area is free, so that a fuel volume which is established in accordance with the flow restrictor configuration 9 flows continuously out of the upper control chamber 6 via the relief opening 7, so that a vertical upward movement of the injector body 3 in the housing 2 of the injector 1 sets.
- a high-pressure fuel is applied to a bore system provided in the interior of the injector body 3 via the high-pressure plenum inlet 11, which opens into an annular space 20 that extends around the injector body 3.
- a transverse bore 12 which extends perpendicular to the line of symmetry of the injector body 3 and a central bore 13 which is connected thereto and runs coaxially to the line of symmetry of the injector body 3, an inlet throttle element 14 located at the end of the central bore 13 is subjected to fuel under high pressure.
- a control chamber 15 provided in the latter is acted upon by fuel under high pressure.
- the inlet throttle 14 opens into the upper boundary wall 30 of the control chamber 15, which on the other hand is delimited by the piston surface 17 of a piston 16 arranged coaxially to the axis of symmetry of the injector body 3.
- a cylindrical boundary wall 32 of the control chamber 15 is located between the two boundary surfaces 17 and 30.
- control chamber 15 While the control chamber 15 is pressurized within the injector body 3 via the line system 11, 12, 13, 14, the pressure relief of the control chamber 15 within the injector 3 and thus a vertical upward movement of the piston 16 with its piston surface 17 into the control chamber 15 can thereby be achieved be that the pressure relief of the upper control chamber 6, the injector body 3 as a whole, a vertical opening movement is impressed.
- the control chamber 15 can be relieved of pressure by means of a discharge throttle 18 opening into its cylinder wall 32 and an adjoining bore with a corresponding upward movement of the injector body 3 via a pressure relief line 28, so that during the upward movement of the piston 16 with its piston surface 17 into the control chamber 15 whose pressure relief an opening of the nozzle needle of the injector 5 can be achieved from its seat
- a nozzle feed line 21, which is designed to be resistant to high pressure, is also accommodated, via which the fuel injector 5, which is not shown here, can be acted upon by fuel under high pressure.
- the injector body 3 is placed in a position in which the nozzle feed line 21 is closed on the high pressure side by the abutment of a seat surface 22 of the injector 3 on the housing 2. H.
- the high-pressure fuel volume contained in the annular space 20 is in contact with the control space 15 via the bores 12, 13, 14 and thereby closes the nozzle; on the other hand, there is no fuel under high pressure in the nozzle chamber of the injection nozzle 5, since the sealing seat 22 separates the nozzle inlet 21 from the high-pressure collecting chamber inlet 11 on the housing side.
- Relieving the pressure on the upper control chamber 6 by actuating the electric actuator 10 leads to a pressure relief of the upper control chamber 6.
- the cylindrical end face of the injector body 3 moves into it, so that a vertical ascending movement of the injector body 3 in the housing 2 of the injector 1 occurs .
- a first slide 23 moves on the injector body 3 Via a first control edge 24 on the housing side.
- the injector body 3 can be opened further. This leads to the opening of the second slide 25 after passage of the control edge 26 provided on the housing. If the second slide is opened, pressure relief of the control chamber 15 by the outlet throttle 18 occurs in the annular space surrounding the injector body 3, which contains an outlet line 28.
- the nozzle needle of the injection nozzle 5 opens on its seat surface, so that the fuel volume that is present in the nozzle feed line 21 — the seat surface 22 of the injector body 3 is open — can be injected under high pressure.
- the injector is pressure controlled, while in the partial stroke mode, i.e. H. the generation of only one upward movement of the injector body 3, which corresponds to the stroke 27, the injector is stroke-controlled.
- a leakage oil chamber is identified by reference numeral 29, in which fuel from the control chamber 15 collects along the piston 16. This, like the control volume flowing out of the upper control chamber 6 via the relief line 7, and that via the.
- the discharge throttle 18 and the discharge line 28 from the control volume 15 flowing out of the control chamber 15 provided in the injector body are fed back to the fuel tank.
- both the high-pressure plenum inlet 11 to the annular space 20 and the branch 8 to the upper control chamber 6 and the nozzle inlet 21 in the housing 2 of the injector 1 are designed as bores and the housing is made of high-strength metallic material.
- the injector body 3 which can be moved up and down in the housing 2 of the injector 1.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Nozzles (AREA)
Abstract
Description
Bei Einspritzsystemen an direkteinspritzenden Verbrennungskraftmaschinen werden heute Hochdruckspeichersysteme (Common Rail) eingesetzt. Diese haben die Aufgabe, den Kraftstoff unter hohem Druck zu speichern. Druckschwingungen, die etwa durch die Pumpbewegung und den Einspritzvorgang entstehen können, sollen durch das im Hochdruckspeicher enthaltene Kraftstoffvolumen gedämpft werden. Der Kraftstoff wird mittels Injektoren in die Brennräume der Verbrennungskraftmaschinen eingespritzt. An den Injektoren werden Spritzbeginn und Einspritzmenge eingestellt; diese werden vorzugsweise am Zylinderkopf einer Verbrennungskraftmaschine angeordnet.High-pressure storage systems (common rail) are used today in injection systems on direct-injection internal combustion engines. These have the task of storing the fuel under high pressure. Pressure fluctuations that may arise from the pumping movement and the injection process are to be dampened by the fuel volume contained in the high-pressure accumulator. The fuel is injected into the combustion chambers of the internal combustion engines by means of injectors. Start of injection and injection quantity are set on the injectors; these are preferably arranged on the cylinder head of an internal combustion engine.
EP 1 036 931 A2 bezieht sich auf eine Kraftstoffinjektoranordnung mit einer Düse, die eine erste Bohrung enthält, in der eine Düsennadel gleitend gelagert ist. Die Nadel wirkt mit einem Sitz zusammen, um den Kraftstofffluss von einer Zufuhrkammer zu einer Auslassöffnung zu steuern, wobei eine der Nadel zugeordnete Fläche dem Kraftstoffdruck in einem Steuerraum ausgesetzt ist. Ein mit Kraftstoffdruck betätigbares Steuerventil steuert die Versorgung der Zufuhrkammer mit Kraftstoff. Ein Kolben ist gleitend in dem Steuerventil angeordnet (Figur 5).EP 1 036 931 A2 relates to a fuel injector arrangement with a nozzle which contains a first bore in which a nozzle needle is slidably mounted. The needle cooperates with a seat to control the flow of fuel from a supply chamber to an outlet opening, with an area associated with the needle being exposed to fuel pressure in a control room. A control valve that can be operated with fuel pressure controls the supply of fuel to the supply chamber. A piston is slidably disposed in the control valve (Figure 5).
DE 198 35 494 A1 bezieht sich auf eine Pump- Düse- Einheit. Diese dient der Kraftstoffzufuhr in einen Verbrennungsraum von direkteinspritzenden Verbrennungskraftmaschinen mit einer Pumpeneinheit zum Aufbau eines Einspritzdrucks. Zum Einspritzen des Kraftstoffes in den Verbrennungsraum sind Einspritzdüsen vorgesehen. Ferner umfasst das System eine Steuereinheit mit einem Steuerventil, das als nach außen öffnendes A-Ventil ausgebildet ist. Ferner ist eine Ventilbetätigungseinheit zur Steuerung des Druckaufbaus in der Pumpeneinheit umfasst. Um eine Pumpe- Düse- Einheit mit einer Steuereinheit zu schaffen, die einen einfachen Aufbau hat, kleinbauend ist und die insbesondere eine kurze Ansprechzeit hat, ist gemäß der Lösung aus DE 198 35 494 A1 bekannt, die Ventilbetätigungseinheit als einen piezoelektrischen Aktor auszubilden.DE 198 35 494 A1 relates to a pump nozzle unit. This serves to supply fuel to a combustion chamber of direct-injection internal combustion engines with a pump unit for building up an injection pressure. Injectors are provided for injecting the fuel into the combustion chamber. The system further comprises a control unit with a control valve, which is designed as an outward opening A valve. A valve actuation unit for controlling the pressure build-up in the pump unit is also included. In order to create a pump-nozzle unit with a control unit which has a simple construction, is of small construction and which in particular has a short response time, it is known according to the solution from DE 198 35 494 A1 to design the valve actuation unit as a piezoelectric actuator.
Mit der erfindungsgemäß vorgeschlagenen Lösung lässt sich auf vorteilhafte Weise eine Injektorbauform erzielen, die sowohl eine Hubsteuerung des Injektorkörpers als auch dessen Drucksteuerung ermöglicht. Damit kann neuesten Anforderungen aus den Pflichtenhälften von Nutzkraftfahzeugmotorenherstellern Rechnung getragen werden, die eine Injektorsteuerung nach zwei getrennten Prinzipien fordern, um die Verbrennungskraftmaschine stets im optimalen Betriebspunkt betreiben zu können.With the solution proposed according to the invention, an injector design can be achieved in an advantageous manner, which enables both stroke control of the injector body and its pressure control. This allows the latest requirements from the requirements of commercial vehicle engine manufacturers to be taken into account, which require injector control according to two separate principles in order to be able to operate the internal combustion engine at the optimum operating point at all times.
Im erfindungsgemäß vorgeschlagenen Injektor lässt sich durch die Konfiguration des 3/2-Wege-Ventils über den Hub des 3/2-Wege-Ventils der Druck im Düsenraum der Einspritzdüse schlagartig entlasten. Die schlagartige Entlastung des Düsenraumes bewirkt in diesem Betriebszustand eine Drucksteuerung des Injektors. Die schlagartige Entlastung des Düsenraumes erfolgt bei Durchsteuerung des Ventilkörpers im Gehäuse des Injektors unter Zurücklegung des vollen Hubweges; wird der Injektor hingegen im Teildruck betrieben, kann einer der im Injektorkörper ausgebildeten Schieber auch geschlossen sein, während der jeweils andere im Injektorkörper ausgebildete Schieber an seiner Steuerkante geöffnet ist und somit einen Hub zulässt Die Schieber sind am im Injektorgehäuse in vertikaler Richtung bewegbaren Ventilkörper versetzt aufgenommen, so daß sich ein Übergang von Hubauf Drucksteuerung und umgekehrt des Injektors auf einfache Weise erzielen läßt und die vertikale Position des Injektorkörpers relativ zum Injektorgehäuse definiert ist.In the injector proposed according to the invention, the configuration of the 3/2-way valve via the stroke of the 3/2-way valve can suddenly relieve the pressure in the nozzle space of the injection nozzle. The sudden relief of the nozzle space causes pressure control of the injector in this operating state. The sudden relief of the nozzle space takes place when the valve body is controlled in the injector housing, covering the full stroke; if, on the other hand, the injector is operated in partial pressure, one of the slides formed in the injector body can also be closed, while the other slider formed in the injector body is open at its control edge and thus permits a stroke , so that a transition from stroke to pressure control and vice versa of the injector can be achieved in a simple manner and the vertical position of the injector body is defined relative to the injector housing.
Die vertikale Bewegung des Injektorkörpers im Gehäuse des Injektors erfolgt durch einen an einem Ende des Ventilkörpers vorgesehenen Piezoaktor oder eines anderen elektrischen Stellelementes, mit dem sich unter Einwirkung kürzester Ansprechzeiten unterschiedlich ein Schließen - bzw. Öffnen der einzelnen Schieber/Steuerkantenkombination erzielen lässt. Als Aktoren zur Druckentlastung des Steuerraumes lassen sich vorteilhaft Magnetventile oder Piezoaktoren einsetzen.The vertical movement of the injector body in the housing of the injector takes place by means of a piezo actuator provided at one end of the valve body or another electrical actuating element with which the individual slider / control edge combination can be closed or opened differently under the influence of the shortest response times. Solenoid valves or piezo actuators can advantageously be used as actuators to relieve the pressure in the control room.
Anhand der Zeichnung wird die Erfindung nachstehend näher erläutert.The invention is explained in more detail below with the aid of the drawing.
Die einzige Figur zeigt, einen Längsschnitt durch einen Injektor durch ein 3/2-Wege-Ventil, an dessen Injektorkörper zwei zueinander in vertikaler Richtung versetzte Schieberkanten ausgebildet sind.The single figure shows a longitudinal section through an injector through a 3/2-way valve, on the injector body of which two slide edges offset from one another in the vertical direction are formed.
Der Darstellung gemäß der einzigen Figur ist der Längsschnitt durch einen Injektorkörper entnehmbar, an dem Zweischieber-/Steuerkanten ausgebildet sind.The illustration according to the single figure shows the longitudinal section through an injector body on which two-slide / control edges are formed.
Der in der Darstellung gemäß Figur 1 wiedergegebene Injektor 1 zum Einspritzen von unter hohem Druck stehenden Kraftstoff in die Brennräume einer Verbrennungskraftmaschine ist Bestandteil eines Einspritzsystems, welches einen Hochdrucksammelraum (Common Rail) umfaßt. Im Hochdrucksammelraum (Common Rail) wird der Kraftstoff mittels einer Pumpe auf einem extrem hohen Druckniveau gehalten, um das im Pumpenraum vorliegende Kraftstoffvolumen als Dämpfungselement für durch die Pumpenbewegung induzierte Druckspülungen bzw. durch die Bewegung des Injektors im Leitungssystem induzierte Druckschwingung zu nutzen.The injector 1 shown in the illustration according to FIG. 1 for injecting fuel under high pressure into the combustion chambers of an internal combustion engine is part of an injection system which comprises a high-pressure plenum (common rail). In the high-pressure accumulation chamber (common rail), the fuel is kept at an extremely high pressure level by means of a pump in order to use the fuel volume in the pump chamber as a damping element for pressure flushing induced by the pump movement or pressure oscillation induced by the movement of the injector in the line system.
Der aus der Darstellung gemäß Figur 1 hervorgehende Injektor 1 umfaßt im wesentlichen ein in einem Gehäuse 2 vertikal bewegbaren Injektorkörper 3. Der Injektorkörper 3 ist als rotationssymmetrisches Bauteil in einer Bohrung des Gehäuses 2 eingelassen. Am unteren Ende des Injektorkörpers 3 ist diesem gegenüberliegend ein Druckstangenelement 4 angeordnet, welches einem Kolben 16 gegenüberliegt, der seinerseits mit einem im Injektorkörper 3 ausgebildeten Steuerraum 15 zusammenwirkt.The injector 1 resulting from the illustration according to FIG. 1 essentially comprises an injector body 3 which can be moved vertically in a housing 2. The injector body 3 is embedded as a rotationally symmetrical component in a bore in the housing 2. At the bottom At the end of the injector body 3, a push rod element 4 is arranged opposite this, which is opposite a piston 16, which in turn interacts with a control chamber 15 formed in the injector body 3.
An der Oberseite des Injektorkörpers 3 gemäß der Darstellung aus Figur 1 befindet sich, dessen oberer zylindrischer Stirnfläche gegenüberliegend, ein Steuerraum 6. Der Steuerraum 6 ist konstant über einen Abzweig 8 mit unter hohem Druck stehenden Kraftstoff versorgt, so daß gewährleistet ist, daß stets eine ausreichende Steuermenge von Kraftstoff im oberen Steuerraum 6 vorliegt. In die Zuleitung 8, die einerseits in den oberen Steuerraum 6 mündet und andererseits vom Hochdrucksammelraum - Zulauf abzweigt ist ein Drosselelement eingelassen. Der obere Steuerraum 6 ist über eine Entlastungsöffnung 7, an welche sich eine Ablaufdrossel 9 anschließt, druckentlastbar. Die Druckentlastung des oberen Steuerraumes 6 und damit die Induzierung der vertikalen Auf- bzw. Abbewegung des Injektorkörpers 3 im Gehäuse 2 des Injektors erfolgt durch die Ansteuerung eines Aktorelementes 10, welches beispielsweise als ein Magnetventil oder als ein Piezoaktor ausgebildet sein kann und den Druck auf das als Schließelement dienende Kugelelement steuert. Wird das als Schließelement fungierende Kugelelement druckentlastet, gibt es seine Sitzfläche frei, so daß ein entsprechend der Ablaufdrosselkonfiguration 9 sich einstellendes Kraftstoffvolumen kontinuierlich über die Entlastungsöffnung 7 aus dem oberen Steuerraum 6 abfließt, so daß sich eine vertikale Hochfahrbewegung des Injektorkörpers 3 im Gehäuse 2 des Injektors 1 einstellt.On the upper side of the injector body 3 as shown in FIG. 1 there is a control chamber 6, the upper cylindrical end face of which is opposite. The control chamber 6 is constantly supplied with fuel under high pressure via a branch 8, so that it is ensured that always one there is sufficient tax amount of fuel in the upper control chamber 6. A throttle element is let into the supply line 8, which on the one hand opens into the upper control chamber 6 and on the other hand branches off from the high-pressure plenum inlet. The upper control chamber 6 can be relieved of pressure via a relief opening 7, to which an outlet throttle 9 connects. The pressure relief of the upper control chamber 6 and thus the induction of the vertical upward and downward movement of the injector body 3 in the housing 2 of the injector takes place by the control of an actuator element 10, which can be designed, for example, as a solenoid valve or as a piezo actuator and the pressure on the controls as a closing element ball element. If the spherical element acting as the closing element is relieved of pressure, its seating area is free, so that a fuel volume which is established in accordance with the flow restrictor configuration 9 flows continuously out of the upper control chamber 6 via the relief opening 7, so that a vertical upward movement of the injector body 3 in the housing 2 of the injector 1 sets.
Über den Hochdrucksammelraumzulauf 11, der in einem ringförmig sich um den Injektorkörper 3 erstreckenden Ringraum 20 mündet, wird ein im inneren des Injektorkörpers 3 vorgesehenes Bohrungssystem mit unter hohem Druck stehenden Kraftstoff beaufschlagt. Über eine Querbohrung 12, die sich senkrecht zur Symmetrielinie des Injektorkörpers 3 erstreckt und eine mit dieser in Verbindung stehende, koaxial zur Symmetrielinie des Injektorkörpers 3 verlaufende Zentralbohrung 13, wird ein am Ende der Zentralbohrung 13 liegendes Zulaufdrosselelement 14 mit unter hohem Druck stehenden Kraftstoff beaufschlagt. Über das Zulaufdrosselelement 14 am Ende der Zentralbohrung 13 im Injektorkörper 3 wird ein in diesem vorgesehener Steuerraum 15 mit unter hohem Druck stehenden Kraftstoff beaufschlagt. Die Zulaufdrossel 14 mündet in der oberen Begrenzungswand 30 des Steuerraumes 15, der andererseits von der Kolbenfläche 17 eines koaxial zur Symmetrieachse des Injektorkörpers 3 angeordneten Kolbens 16 begrenzt ist. Zwischen den beiden Begrenzungsflächen 17 bzw. 30 befindet sich eine zylindrische Begrenzungswand 32 des Steuerraumes 15. Der Kolben 16, der durch Druckbeaufschlagung bzw. Druckentlastung des Streuerraumes 15 eine vertikale Bewegung ausführt, liegt mit seiner der Kolbenfläche 17 gegenüberliegenden Fläche an einer Druckstange 4 an, die mechanisch mit der Einspritzdüse 5 verbunden ist. Somit kann durch Druckbeaufschlagung bzw. Druckentlastung des Steuerraumes 15 eine Bewegung der Einspritzdüse aus ihrem Sitz erreicht werden, d. h. ein Öffnen oder ein Schließen der Einspritzdüse.A high-pressure fuel is applied to a bore system provided in the interior of the injector body 3 via the high-pressure plenum inlet 11, which opens into an annular space 20 that extends around the injector body 3. Via a transverse bore 12 which extends perpendicular to the line of symmetry of the injector body 3 and a central bore 13 which is connected thereto and runs coaxially to the line of symmetry of the injector body 3, an inlet throttle element 14 located at the end of the central bore 13 is subjected to fuel under high pressure. Via the inlet throttle element 14 at the end of the central bore 13 in the injector body 3, a control chamber 15 provided in the latter is acted upon by fuel under high pressure. The inlet throttle 14 opens into the upper boundary wall 30 of the control chamber 15, which on the other hand is delimited by the piston surface 17 of a piston 16 arranged coaxially to the axis of symmetry of the injector body 3. A cylindrical boundary wall 32 of the control chamber 15 is located between the two boundary surfaces 17 and 30. The piston 16, which is acted upon by pressure or pressure relief of the spreader chamber 15 executes a vertical movement, its surface opposite the piston surface 17 bears against a push rod 4 which is mechanically connected to the injection nozzle 5. Movement of the injection nozzle from its seat, ie opening or closing of the injection nozzle, can thus be achieved by pressurizing or relieving pressure in the control chamber 15.
Während die Druckbeaufschlagung des Steuerraumes 15 innerhalb des Injektorkörpers 3 über das Leitungssystem 11,12,13,14 erfolgt, kann die Druckentlastung des Steuerraumes 15 innerhalb des Injektors 3 und damit eine vertikale Auffahrbewegung des Kolbens 16 mit seiner Kolbenfläche 17 in den Steuerraum 15 dadurch erreicht werden, dass über die Druckentlastung des oberen Steuerraumes 6 dem Injektorkörper 3 als Ganzes eine vertikale Auffahrbewegung aufgeprägt wird. Der Steuerraum 15 ist durch eine in seiner Zylinderwandung 32 mündende Ablaufdrossel 18 und eine sich daran anschließende Bohrung bei entsprechender Auffahrbewegung des Injektorkörpers 3 über eine Druckentlastungsleitung 28, die Leckölleitung druckentlastbar, so daß bei Auffahrbewegungen des Kolbens 16 mit seiner Kolbenfläche 17 in den Steuerraum 15 bei dessen Druckentlastung eine Öffnung der Düsennadel der Einspritzdüse 5 aus ihrem Sitz erzielbar istWhile the control chamber 15 is pressurized within the injector body 3 via the line system 11, 12, 13, 14, the pressure relief of the control chamber 15 within the injector 3 and thus a vertical upward movement of the piston 16 with its piston surface 17 into the control chamber 15 can thereby be achieved be that the pressure relief of the upper control chamber 6, the injector body 3 as a whole, a vertical opening movement is impressed. The control chamber 15 can be relieved of pressure by means of a discharge throttle 18 opening into its cylinder wall 32 and an adjoining bore with a corresponding upward movement of the injector body 3 via a pressure relief line 28, so that during the upward movement of the piston 16 with its piston surface 17 into the control chamber 15 whose pressure relief an opening of the nozzle needle of the injector 5 can be achieved from its seat
Im Gehäuse 2 des Injektors 1 ist darüber hinaus eine Düsenzulaufleitung 21, die hochdruckfest ausgelegt ist, aufgenommen, über welche die Einspritzdüse 5, die hier nicht dargestellt ist, mit unter hohem Druck stehenden Kraftstoff beaufschlagbar ist. In der in Figur 1 dargestellten Zeichnung ist der Injektorkörper 3 in einer Position gestellt, in der die Düsenzulaufleitung 21 durch Anliegen einer Sitzfläche 22 des Injektors 3 am Gehäuse 2 hochdruckseitig geschlossen ist, d. h. das im Ringraum 20 enthaltene unter hohem Druck stehende Kraftstoffvolumen liegt zwar über die Bohrungen 12, 13, 14 am Steuerraum 15 an und verschließt dadurch die Düse; andererseits steht im Düsenraum der Einspritzdüse 5 kein unter hohem Druck stehender Kraftstoff an, da der Dichtsitz 22 den Düsenzulauf 21 vom Hochdrucksammelraumzulauf 11 gehäuseseitig abtrennt.In the housing 2 of the injector 1, a nozzle feed line 21, which is designed to be resistant to high pressure, is also accommodated, via which the fuel injector 5, which is not shown here, can be acted upon by fuel under high pressure. In the drawing shown in Figure 1, the injector body 3 is placed in a position in which the nozzle feed line 21 is closed on the high pressure side by the abutment of a seat surface 22 of the injector 3 on the housing 2. H. the high-pressure fuel volume contained in the annular space 20 is in contact with the control space 15 via the bores 12, 13, 14 and thereby closes the nozzle; on the other hand, there is no fuel under high pressure in the nozzle chamber of the injection nozzle 5, since the sealing seat 22 separates the nozzle inlet 21 from the high-pressure collecting chamber inlet 11 on the housing side.
Eine Entlastung des oberen Steuerraum 6 durch Ansteuerung des elektrischen Aktors 10 führt zu einer Druckentlastung des oberen Steuerraums 6. Dadurch fährt die zylindrische Stirnfläche des Inj ektorkörpers 3 in diesen ein, so daß sich eine vertikale Auffahrbewegung des Injektorkörpers 3 im Gehäuse 2 des Injektors 1 einstellt. Je nachdem, welches Steuervolumen über die Entlastungsöffnung 7 und die sich anschließende Ablaufdrossel 9 aus dem oberen Steuerraum 6 entwichen ist, fährt ein erster Schieber 23 am Injektorkörper 3 über eine gehäuseseitig ausgebildete erste Steuerkante 24. Dadurch ist bei Öffnung der Dichtfläche 22 und damit der Druckbeaufschlagung der Düsenzulaufleitung 21 zur Einspritzdüse 5 sichergestellt, dass kein unter hohem Druck stehender Kraftstoff direkt in eine Ablaufleitung 28 eintreten kann, d. h. der Injektor ist leckölseitig geschlossen. In diesem Teilhubmodus ist sicherzustellen, daß das aus dem oberen Steuerraum 6 entwichene Steuervolumen dem Injektor 3 gerade einen Hubweg 27 aufprägt, welcher ausreichend bemessen ist, um die Steuerkante 24 gehäuseseitig und die Injektorkörperseitig vorgesehene Schieberkante 23 zur Überdeckung zu bringen.Relieving the pressure on the upper control chamber 6 by actuating the electric actuator 10 leads to a pressure relief of the upper control chamber 6. As a result, the cylindrical end face of the injector body 3 moves into it, so that a vertical ascending movement of the injector body 3 in the housing 2 of the injector 1 occurs , Depending on which control volume has escaped from the upper control chamber 6 via the relief opening 7 and the subsequent discharge throttle 9, a first slide 23 moves on the injector body 3 Via a first control edge 24 on the housing side. When the sealing surface 22 is opened and the pressure on the nozzle feed line 21 to the injection nozzle 5 is opened, this ensures that no fuel under high pressure can enter a discharge line 28 directly, ie the injector is closed on the leakage oil side. In this partial stroke mode, it must be ensured that the control volume escaping from the upper control chamber 6 just impresses a stroke 27 on the injector 3, which is dimensioned sufficiently to bring the control edge 24 on the housing side and the slide edge 23 provided on the injector body side to overlap.
Bei einer weiteren, darüber hinausgehenden Druckentlastung des oberen Steuerraumes 6 durch Öffnung der Entlastungsöffnung 7 bzw. Ansteuerung des elektrischen Aktors 10 ist ein weiteres Auffahren des Injektorkörpers 3 möglich. Dadurch kommt es zum Öffnen des zweiten Schiebers 25 nach Passage der gehäuseseitig vorgesehenen Steuerkante 26. Ist der zweite Schieber geöffnet, so tritt eine Druckentlastung des Steuerraumes 15 durch die Ablaufdrossel 18 in den den Injektorkörper 3 umgebenden Ringraum ein, welcher eine Ablaufleitung 28 enthält. Durch das Öffnen des zweiten Schiebers bei einer Durchsteuerung des Ventilkörpers 3, d. h. dem Erzeugen der vollen vertikalen Hubbewegung des Injektorkörpers 3 im diesen umgebenden Gehäuse 2, ist eine schlagartige Druckentlastung des Steuerraumes 15 möglich, so dass der Kolben 16 mit seiner Kolbenfläche 17 in diesen einfährt. In diesem Betriebszustand öffnet die Düsennadel der Einspritzdüse 5 an ihrer Sitzfläche, so dass das in der Düsenzuleitung 21 anstehende -die Sitzfläche 22 des Injektorkörpers 3 ist geöffnet- unter hohem Druck stehende Kraftstoffvolumen eingespritzt werden kann.In the case of a further, additional pressure relief of the upper control chamber 6 by opening the relief opening 7 or actuating the electrical actuator 10, the injector body 3 can be opened further. This leads to the opening of the second slide 25 after passage of the control edge 26 provided on the housing. If the second slide is opened, pressure relief of the control chamber 15 by the outlet throttle 18 occurs in the annular space surrounding the injector body 3, which contains an outlet line 28. By opening the second slide when controlling the valve body 3, d. H. the generation of the full vertical stroke movement of the injector body 3 in the housing 2 surrounding it, a sudden pressure relief of the control chamber 15 is possible, so that the piston 16 with its piston surface 17 moves into it. In this operating state, the nozzle needle of the injection nozzle 5 opens on its seat surface, so that the fuel volume that is present in the nozzle feed line 21 — the seat surface 22 of the injector body 3 is open — can be injected under high pressure.
In diesem Zustand ist der Injektor druckgesteuert, während im Teilhubmodus, d. h. der Erzeugung lediglich einer Auffahrbewegung des Injektorkörpers 3, welche dem Hubweg 27 entspricht der Injektor hubgesteuert ist.In this state, the injector is pressure controlled, while in the partial stroke mode, i.e. H. the generation of only one upward movement of the injector body 3, which corresponds to the stroke 27, the injector is stroke-controlled.
Mit Bezugszeichen 29 ist ein Leckölraum identifiziert, in welchem sich am Kolben 16 entlangströmender Kraftstoff aus dem Steuerraum 15 sammelt. Dieser wird, wie auch das über die Entlastungsleitung 7 aus dem oberen Steuerraum 6 abströmende Steuervolumen sowie das über die. Ablaufdrossel 18 und die Ablaufleitung 28 aus dem im Injektorkörper 3 vorgesehenen Steuerraum 15 abströmende Steuervolumen, wieder dem Kraftstoffbehälter zugeführt.A leakage oil chamber is identified by reference numeral 29, in which fuel from the control chamber 15 collects along the piston 16. This, like the control volume flowing out of the upper control chamber 6 via the relief line 7, and that via the. The discharge throttle 18 and the discharge line 28 from the control volume 15 flowing out of the control chamber 15 provided in the injector body are fed back to the fuel tank.
Der Vollständigkeit halber sei erwähnt, daß aus Festigkeitsgründen und um einen dauerfesten Betrieb der erfindungsgemäßen Injektorkonfiguration zu gewährleisten, sowohl der Hochdrucksammelraumzulauf 11 zum Ringraum 20 als auch der Abzweig 8 zum oberen Steuerraum 6 sowie der Düsenzulauf 21 im Gehäuse 2 des Injektors 1 als Bohrungen gestaltet sind und das Gehäuse aus hochfestem metallischen Werkstoff gefertigt ist. Gleiches gilt für den im Gehäuse 2 des Injektors 1 auf- und abbewegbaren Injektorkörper 3.For the sake of completeness, it should be mentioned that, for reasons of strength and to ensure permanent operation of the injector configuration according to the invention, both the high-pressure plenum inlet 11 to the annular space 20 and the branch 8 to the upper control chamber 6 and the nozzle inlet 21 in the housing 2 of the injector 1 are designed as bores and the housing is made of high-strength metallic material. The same applies to the injector body 3 which can be moved up and down in the housing 2 of the injector 1.
Claims (7)
- Injector for injecting fuel into the combustion chamber of an internal combustion engine, having an injector body (3) which can be moved in a housing (2) and whose vertical stroke movement takes place relative to the housing (2) by means of a control space (6) which is pressure-relieved by means of an actuator (10), and by means of a vertical reciprocating movement of the injector body (3) a nozzle inflow line (21) which is provided in the housing (2) of the injector and to which fuel under high pressure is applied is closed or opened with respect to the injection nozzle (5), characterized in that a first slide (23) and a further slide (25) are formed on the injector body (3) offset from one another in order to control the reciprocating movement and/or pressure of the injector, and in that a control space (15) which can be affected via a high pressure inflow (11) is formed in the injector body (3), the slides (23) and (25) interacting at the housing end with control edges (24) and (26) and controlling a connection between the nozzle inflow line (21) and the control space (15) and an outflow line (28).
- Injector according to Claim 1, characterized in that a partial travel distance (27) for closing the first slide (23) is shorter than the travel distance necessary to open the further slide (25) in order to relieve the pressure in the control space (15) in the injector body (3).
- Injector according to Claim 2, characterized in that the control space (15) can be pressure-relieved via an outflow throttle (18).
- Injector according to Claim 1, characterized in that the injector body (3) contains a bore system (12), (13) and an inflow throttle (14) by means of which the control space (15) is kept constantly at high pressure.
- Injector according to Claim 1, characterized in that a piston/thrust rod arrangement (4), (16) is mechanically connected to the injection nozzle (5) and opens the injection nozzle (5) when the control space (15) is pressure-relieved.
- Injector according to Claim 1, characterized in that the control space (6) which controls the vertical reciprocating movement of the injector body (3) can be affected by the high-pressure collecting space inflow (11) via a branch (8) and can be pressure-relieved by means of an actuable actuator (10) with an outflow throttle element which is connected upstream.
- Injector according to Claim 1, characterized in that, when a seat surface (22) on an annular space (20) in the housing (2) of the injector (1) is opened, high pressure is applied to the nozzle inflow line (21) and at the same time the first slide (23), (24) is closed and the injection nozzle (5) is opened by opening the second slide (25), (26) into the outflow line (28), by relieving the pressure in the control space (15).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10053903A DE10053903A1 (en) | 2000-10-31 | 2000-10-31 | Stroke and pressure controlled injector with double slide |
| DE10053903 | 2000-10-31 | ||
| PCT/DE2001/003658 WO2002036958A1 (en) | 2000-10-31 | 2001-09-21 | Lift and/or pressure-controlled injector with a double slide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1334271A1 EP1334271A1 (en) | 2003-08-13 |
| EP1334271B1 true EP1334271B1 (en) | 2004-12-29 |
Family
ID=7661639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01992832A Expired - Lifetime EP1334271B1 (en) | 2000-10-31 | 2001-09-21 | Lift and/or pressure-controlled injector with a double slide |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6848630B2 (en) |
| EP (1) | EP1334271B1 (en) |
| JP (1) | JP2004512464A (en) |
| AT (1) | ATE286208T1 (en) |
| DE (2) | DE10053903A1 (en) |
| WO (1) | WO2002036958A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10141221B4 (en) * | 2001-08-23 | 2009-07-30 | Robert Bosch Gmbh | Pressure-stroke controlled injector for fuel injection systems |
| DE10336411A1 (en) * | 2003-08-08 | 2005-03-03 | Robert Bosch Gmbh | Fuel injection device for an internal combustion engine |
| JP4078320B2 (en) * | 2004-02-27 | 2008-04-23 | 三菱重工業株式会社 | Poppet valve device and electronically controlled fuel injection device including the same |
| DE102004030446A1 (en) * | 2004-06-24 | 2006-01-12 | Robert Bosch Gmbh | Fuel injector |
| DE102005014180A1 (en) * | 2005-03-29 | 2006-10-05 | Robert Bosch Gmbh | Fuel injector for internal combustion (IC) engine, has pilot space formed on injection valve member facing side of pilot piston and opened into pilot connection arranged with solenoid-operated pilot control valve |
| DK177456B1 (en) * | 2011-06-27 | 2013-06-17 | Man Diesel & Turbo Deutschland | A fuel valve for large turbocharged two stroke diesel engines |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD103691A1 (en) * | 1973-04-06 | 1974-02-05 | ||
| JPH07117012B2 (en) * | 1986-09-05 | 1995-12-18 | トヨタ自動車株式会社 | Unit Injector |
| US5397055A (en) * | 1991-11-01 | 1995-03-14 | Paul; Marius A. | Fuel injector system |
| US5263645A (en) * | 1991-11-01 | 1993-11-23 | Paul Marius A | Fuel injector system |
| AT408134B (en) | 1995-06-06 | 2001-09-25 | Avl Verbrennungskraft Messtech | STORAGE INJECTION SYSTEM FOR DIESEL 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 |
| DE29708369U1 (en) * | 1997-05-09 | 1997-07-10 | FEV Motorentechnik GmbH & Co. KG, 52078 Aachen | Controllable injection valve for fuel injection on internal combustion engines |
| DE19742073A1 (en) * | 1997-09-24 | 1999-03-25 | Bosch Gmbh Robert | Fuel injection arrangement for internal combustion engines |
| DE19835494C2 (en) * | 1998-08-06 | 2000-06-21 | Bosch Gmbh Robert | Pump-nozzle unit |
| GB9823134D0 (en) * | 1998-10-23 | 1998-12-16 | Lucas Ind Plc | Valve |
| GB9905896D0 (en) * | 1999-03-16 | 1999-05-05 | Lucas Ind Plc | Fuel injector arrangement |
| DE19923421C2 (en) * | 1999-05-21 | 2003-03-27 | Bosch Gmbh Robert | injector |
| US6227459B1 (en) * | 1999-08-02 | 2001-05-08 | Caterpillar Inc. | Valve with self-centering, self-sealing seat component |
| DE19939448A1 (en) * | 1999-08-20 | 2001-03-01 | Bosch Gmbh Robert | Injector |
-
2000
- 2000-10-31 DE DE10053903A patent/DE10053903A1/en not_active Ceased
-
2001
- 2001-09-21 US US10/169,123 patent/US6848630B2/en not_active Expired - Lifetime
- 2001-09-21 DE DE50104994T patent/DE50104994D1/en not_active Expired - Lifetime
- 2001-09-21 WO PCT/DE2001/003658 patent/WO2002036958A1/en active IP Right Grant
- 2001-09-21 EP EP01992832A patent/EP1334271B1/en not_active Expired - Lifetime
- 2001-09-21 AT AT01992832T patent/ATE286208T1/en not_active IP Right Cessation
- 2001-09-21 JP JP2002539683A patent/JP2004512464A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US6848630B2 (en) | 2005-02-01 |
| ATE286208T1 (en) | 2005-01-15 |
| DE10053903A1 (en) | 2002-05-29 |
| JP2004512464A (en) | 2004-04-22 |
| EP1334271A1 (en) | 2003-08-13 |
| DE50104994D1 (en) | 2005-02-03 |
| WO2002036958A1 (en) | 2002-05-10 |
| US20030089792A1 (en) | 2003-05-15 |
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