EP2619441B1 - Method for testing and repairing a fuel injector - Google Patents

Method for testing and repairing a fuel injector Download PDF

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Publication number
EP2619441B1
EP2619441B1 EP11767597.5A EP11767597A EP2619441B1 EP 2619441 B1 EP2619441 B1 EP 2619441B1 EP 11767597 A EP11767597 A EP 11767597A EP 2619441 B1 EP2619441 B1 EP 2619441B1
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EP
European Patent Office
Prior art keywords
injector
functional components
nozzle
internal combustion
combustion engine
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EP11767597.5A
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German (de)
French (fr)
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EP2619441A1 (en
Inventor
Martin Bernhaupt
Martin Jordan
Sebastian Rettenbacher
Gerhard Russegger
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/001—Measuring fuel delivery of a fuel injector
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8092—Fuel injection apparatus manufacture, repair or assembly adjusting or calibration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49718—Repairing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49718—Repairing
    • Y10T29/49721—Repairing with disassembling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49764—Method of mechanical manufacture with testing or indicating

Definitions

  • the invention relates to a method for checking and repairing an injector for injecting fuel into the combustion chamber of an internal combustion engine, wherein the injector has a nozzle, a throttle plate and a control valve and a nozzle retaining nut which holds said parts together and with which said parts on a Injector body of the injector are attached.
  • servo-controlled injectors for internal combustion engines in particular in modular common rail injection systems, the control of the injection takes place with the aid of an electronically controlled control or servo valve.
  • the control valve controls the outflow of fuel from the control chamber of an injection nozzle, which realizes the hydraulic actuation of an injection nozzle.
  • Modular common-rail injection systems are injection systems that are primarily used in particularly large engines in which the individual injectors may be mounted at a considerable distance from each other, so that the sole use of a common rail for the injectors is not useful. In such engines, it is therefore intended to assign each individual injector its own high-pressure fuel storage, which is integrated in the injector.
  • each injector has its own high-pressure fuel storage and thus can be used as a stand-alone injector unit.
  • a high-pressure fuel storage is not an ordinary line to understand, but it is at a high-pressure fuel storage to a pressure-resistant vessel with an inlet and a derivative whose diameter is significantly increased compared to the high pressure lines, so delivered from the high-pressure fuel storage a certain amount of injection can be, without causing an immediate pressure drop, such as this would be the case if the injection quantity were taken from an ordinary high-pressure line.
  • the modular injectors to which the present invention relates in addition to the integrated in the injector high-pressure fuel storage on a functional group consisting of a nozzle, a throttle plate and a control valve as functional components, which are bolted to the injector body with a nozzle lock nut.
  • the injection characteristic of an injector is influenced exclusively by the tolerance positions of the functional components described above. In order to ensure that the injection quantity of the individual injectors runs within a very narrow tolerance band, it is often not sufficient for the nozzle, throttle plate and servo valve to be manufactured to a tight tolerance. In many cases, these three functional components with specific features are selectively paired with one another or individual properties only selectively produced or set after the other functional components have been measured for their function-critical features. So that an injector works within a very narrow tolerance range, the right combination of nozzle, throttle plate and servo or control valve is crucial.
  • the injectors are completely bolted during initial assembly and functionally tested on very costly calibrated test benches. Injectors that are outside the specified tolerance limits are dismantled again, one or more functional components are replaced, the injectors are screwed back on and rechecked. After a certain period of operation on the engine, it is further regularly provided that the injectors are cleaned and disassembled, renewed the functional components as needed and then mounted the entire injectors as in the first delivery case and functionally tested. In both cases, in addition to the relatively light and small functional components in each case at the place of manufacture of the injectors with the previously known inspection and repair procedures with the partially very heavy injector bodies, which sometimes weigh 10 kg and more, are handled. In the case of repair, all injectors with the high-pressure fuel storage tanks must be collected and transported to a central location where they can be repaired ( DE 10 2005 004327 ).
  • the invention is therefore based on the object to further develop a method of the type mentioned above, that for the adjustment and repair of the functional components that determine the injection characteristics of the respective injector, the handling of the heavy and cumbersome storage can be avoided.
  • the method according to the invention is therefore characterized in that the functional components nozzle, throttle plate and servo valve are separated from the injector body, a connecting piece serving to connect the functional components to a test stand is screwed with the Furitechnischskomponenten to an injector module using the nozzle retaining nut and injector module connected to a test bench and subjected to a check and then, if necessary, a repair.
  • the injector body can be separated from the functional components, the injector body can remain on the internal combustion engine, while the functional components can be independently subjected to a check and, if necessary, a maintenance, and with little effort already preset new functional components of a second injector module an injector body of an internal combustion engine can be placed so that the internal combustion engine with only little installation effort is ready for use again.
  • a preferred procedure provides that the injector module is broken down into its individual parts connector, servo valve, throttle plate, nozzle and nozzle retaining nut and the new functional components nozzle, throttle plate and servo valve with the new nozzle lock nut with the on Internal combustion engine remaining injector body to be screwed to a new injector.
  • connection piece is preferably screwed to the disassembled functional components and the old nozzle retaining nut, brought back to the production facility and connected to a test rig, which simulates the connection situation in the internal combustion engine.
  • a test rig which simulates the connection situation in the internal combustion engine.
  • connection piece serves to be able to carry out a test of the functional components in the injector module thus formed independently of the injector body on a test stand and as a transport lock for the functional components located in the injector module.
  • the functional components nozzle, throttle plate and servo valve are fixed by the nozzle retaining nut on the injector body. After the expansion There is thus the danger that the parts may become loose or be lost during transport for repair.
  • the method according to the invention is therefore preferably developed in such a way that the connecting piece is inserted into the nozzle retaining nut in such a way that the nozzle, the throttle plate and the control valve are held in place in the nozzle retaining nut.
  • Fig. 1 1 denotes an injector according to the invention, in which the functional components of the injector are arranged in the form of a nozzle 3, a throttle plate 4 and a control valve 5, wherein the functional components are fixed by means of a nozzle retaining nut 6 on the injector body 7, which contains a storage volume.
  • the screw connection between the injector body 7 and the nozzle retaining nut 6 is released and the functional components 3, 4, 5 are removed.
  • the functional components 3, 4, 5 by means of the nozzle lock nut 6 with a connector 8 to the in Fig. 2 shown injector module 2, which holds on the one hand, the functional components 3, 4, 5 during transport for inspection or repair in the nozzle retaining nut 6 and on the other hand to the test stand for checking the functional components 3, 4, 5 in the injector module 2 can be connected.

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

Description

Die Erfindung betrifft ein Verfahren zum Überprüfen und Instandsetzen eines Injektors zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine, wobei der Injektor eine Düse, eine Drosselplatte und ein Steuerventil sowie eine Düsenspannmutter aufweist, die die genannten Teile zusammenhält und mit welcher die genannten Teile an einem Injektorkörper des Injektors befestigt sind.The invention relates to a method for checking and repairing an injector for injecting fuel into the combustion chamber of an internal combustion engine, wherein the injector has a nozzle, a throttle plate and a control valve and a nozzle retaining nut which holds said parts together and with which said parts on a Injector body of the injector are attached.

Bei servogesteuerten Injektoren für Brennkraftmaschinen, insbesondere in modularen Common-Rail-Einspritzsystemen, erfolgt die Steuerung der Einspritzung mit Hilfe eines elektronisch angesteuerten Steuer- bzw. Servoventils. Das Steuerventil steuert den Abfluss von Kraftstoff aus dem Steuerraum einer Einspritzdüse, der die hydraulische Betätigung einer Einspritzdüse realisiert. Unter modularen Common-Rail-Einspritzsystemen versteht man Einspritzsysteme, die vorrangig bei besonders großen Motoren zum Einsatz gelangen, bei welchen die einzelnen Injektoren unter Umständen in erheblichem Abstand voneinander angebracht sind, sodass die alleinige Verwendung eines gemeinsamen Rails für die Injektoren nicht sinnvoll ist. Bei solchen Motoren ist es daher vorgesehen, jedem einzelnen Injektor einen eigenen Hochdruckraftstoffspeicher zuzuordnen, der in den Injektor integriert ist. Eine solche Bauweise wird als modularer Aufbau bezeichnet, da jeder einzelne Injektor über seinen eigenen Hochdruckraftstoffspeicher verfügt und somit als eigenständige Injektoreinheit eingesetzt werden kann. Unter einem Hochdruckkraftstoffspeicher ist hierbei nicht eine gewöhnliche Leitung zu verstehen, sondern es handelt sich bei einem Hochdruckkraftstoffspeicher um ein druckfestes Gefäß mit einer Zu- und einer Ableitung, dessen Durchmesser im Vergleich zu den Hochdruckleitungen erheblich vergrößert ist, damit aus dem Hochdruckkraftstoffspeicher eine gewisse Einspritzmenge abgegeben werden kann, ohne dass es zu einem sofortigen Druckabfall kommt, wie dies der Fall wäre, wenn die Einspritzmenge aus einer gewöhnlichen Hochdruckleitung entnommen würde.In servo-controlled injectors for internal combustion engines, in particular in modular common rail injection systems, the control of the injection takes place with the aid of an electronically controlled control or servo valve. The control valve controls the outflow of fuel from the control chamber of an injection nozzle, which realizes the hydraulic actuation of an injection nozzle. Modular common-rail injection systems are injection systems that are primarily used in particularly large engines in which the individual injectors may be mounted at a considerable distance from each other, so that the sole use of a common rail for the injectors is not useful. In such engines, it is therefore intended to assign each individual injector its own high-pressure fuel storage, which is integrated in the injector. Such a design is referred to as a modular design, since each injector has its own high-pressure fuel storage and thus can be used as a stand-alone injector unit. Under a high-pressure fuel storage is not an ordinary line to understand, but it is at a high-pressure fuel storage to a pressure-resistant vessel with an inlet and a derivative whose diameter is significantly increased compared to the high pressure lines, so delivered from the high-pressure fuel storage a certain amount of injection can be, without causing an immediate pressure drop, such as this would be the case if the injection quantity were taken from an ordinary high-pressure line.

Die modularen Injektoren, auf die sich die vorliegende Erfindung bezieht, weisen neben dem im Injektorkörper integrierten Hochdruckkraftstoffspeicher eine Funktionsgruppe auf, die aus einer Düse, einer Drosselplatte und einem Steuerventil als Funktionskomponenten besteht, die mit einer Düsenspannmutter mit dem Injektorkörper verschraubt werden. Die Einspritzcharakteristik eines Injektors wird dabei ausschließlich durch die Toleranzlagen der oben beschriebenen Funktionskomponenten beeinflusst. Um sicherzustellen, dass die Einspritzmenge der einzelnen Injektoren in einem sehr engen Toleranzband verläuft, reicht es oft nicht aus, dass Düse, Drosselplatte und Servoventil in einer engen Toleranz hergestellt werden. Vielfach werden diese drei Funktionskomponenten mit bestimmten Merkmalen gezielt zueinander gepaart bzw. einzelne Eigenschaften erst gezielt hergestellt bzw. eingestellt, nachdem die anderen Funktionskomponenten auf ihre funktionskritischen Merkmale vermessen wurden. Damit ein Injektor in einem sehr engen Toleranzband arbeitet, ist also die richtige Kombination von Düse, Drosselplatte und Servo- bzw. Steuerventil entscheidend.The modular injectors to which the present invention relates, in addition to the integrated in the injector high-pressure fuel storage on a functional group consisting of a nozzle, a throttle plate and a control valve as functional components, which are bolted to the injector body with a nozzle lock nut. The injection characteristic of an injector is influenced exclusively by the tolerance positions of the functional components described above. In order to ensure that the injection quantity of the individual injectors runs within a very narrow tolerance band, it is often not sufficient for the nozzle, throttle plate and servo valve to be manufactured to a tight tolerance. In many cases, these three functional components with specific features are selectively paired with one another or individual properties only selectively produced or set after the other functional components have been measured for their function-critical features. So that an injector works within a very narrow tolerance range, the right combination of nozzle, throttle plate and servo or control valve is crucial.

Für die Erstauslieferung werden die Injektoren bei der Erstmontage komplett verschraubt und an sehr aufwendig geeichten Prüfständen funktionsgeprüft. Injektoren, die außerhalb der festgelegten Toleranzgrenzen liegen, werden wieder zerlegt, ein oder mehrere Funktionskomponenten werden ausgetauscht, die Injektoren wieder verschraubt und neuerlich geprüft. Nach einer bestimmten Betriebszeit am Motor ist es weiters regelmäßig vorgesehen, dass die Injektoren gereinigt und zerlegt werden, die Funktionskomponenten je nach Bedarf erneuert und anschließend die kompletten Injektoren wie im Erstauslieferungsfall montiert und funktionsgeprüft werden. In beiden Fällen muss bei den bisher bekannten Überprüfungs- und Instandsetzungsverfahren neben den relativ leichten und kleinen Funktionskomponenten jeweils am Herstellungsort der Injektoren auch mit den teilweise sehr schweren Injektorkörpern, die mitunter 10 kg und mehr wiegen, hantiert werden. Im Falle der Instandsetzung müssen die gesamten Injektoren mit den Hochdruckkraftstoffspeichern gesammelt und an eine zentrale Stelle transportiert werden, wo sie repariert werden können ( DE 10 2005 004327 ).For the initial delivery, the injectors are completely bolted during initial assembly and functionally tested on very costly calibrated test benches. Injectors that are outside the specified tolerance limits are dismantled again, one or more functional components are replaced, the injectors are screwed back on and rechecked. After a certain period of operation on the engine, it is further regularly provided that the injectors are cleaned and disassembled, renewed the functional components as needed and then mounted the entire injectors as in the first delivery case and functionally tested. In both cases, in addition to the relatively light and small functional components in each case at the place of manufacture of the injectors with the previously known inspection and repair procedures with the partially very heavy injector bodies, which sometimes weigh 10 kg and more, are handled. In the case of repair, all injectors with the high-pressure fuel storage tanks must be collected and transported to a central location where they can be repaired ( DE 10 2005 004327 ).

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art dahingehend weiterzubilden, dass zur Einstellung und Instandsetzung der Funktionskomponenten, die die Einspritzcharakteristik des jeweiligen Injektors bestimmen, das Hantieren mit den schweren und unhandlichen Speichern vermieden werden kann.The invention is therefore based on the object to further develop a method of the type mentioned above, that for the adjustment and repair of the functional components that determine the injection characteristics of the respective injector, the handling of the heavy and cumbersome storage can be avoided.

Zur Lösung dieser Aufgabe ist das erfindungsgemäße Verfahren daher dadurch gekennzeichnet, dass die Funktionskomponenten Düse, Drosselplatte und Servoventil vom Injektorkörper getrennt werden, ein dem Verbinden der Funktionskomponenten mit einem Prüfstand dienendes Anschlussstück mit Hilfe der Düsenspannmutter mit den Furiktionskomponenten zu einem Injektormodul verschraubt wird und das Injektormodul an einen Prüfstand angeschlossen und einer Überprüfung und danach ggf. einer Instandsetzung unterzogen wird. Dadurch, dass der Injektorkörper von den Funktionskomponenten getrennt werden kann, kann der Injektorkörper an der Brennkraftmaschine verbleiben, während die Funktionskomponenten unabhängig von diesem einer Überprüfung und ggf. einer Wartung unterzogen werden können, wobei mit geringem Aufwand auch bereits voreingestellte neue Funktionskomponenten eines zweiten Injektormoduls auf einen Injektorkörper einer Brennkraftmaschine aufgesetzt werden können, sodass die Brennkraftmaschine mit nur geringem Montageaufwand erneut einsatzbereit ist. Eine bevorzugte Verfahrensweise sieht dazu vor, dass das Injektormodul in seine Einzelteile Anschlussstück, Servoventil, Drosselplatte, Düse und Düsenspannmutter zerlegt wird und die neuen Funktionskomponenten Düse, Drosselplatte und Servoventil mit der neuen Düsenspannmutter mit dem an der Brennkraftmaschine verbliebenen Injektorkörper zu einem neuen Injektor verschraubt werden. Das übrige Anschlussstück wird bevorzugt mit den demontierten Funktionskomponenten und der alten Düsenspannmutter verschraubt, zur Fertigungseinrichtung zurück gebracht und an einen Prüfstand angeschlossen, der die Anschlusssituation in der Brennkraftmaschine simuliert. Nach der Überprüfung und Instandsetzung wird das Injektormodul wieder zur Brennkraftmaschine zurücktransportiert und kann dort zum Tausch der Funktionskomponenten eines weiteren Injektors verwendet werden. Auf diese Weise wird die Instandsetzung erheblich vereinfacht, da nur die kleinen Funktionskomponenten zur Fertigungseinrichtung gebracht werden müssen, wodurch der Aufwand für den Transport sowie die Transportkosten bedeutend reduziert werden.To solve this problem, the method according to the invention is therefore characterized in that the functional components nozzle, throttle plate and servo valve are separated from the injector body, a connecting piece serving to connect the functional components to a test stand is screwed with the Furiktionskomponenten to an injector module using the nozzle retaining nut and injector module connected to a test bench and subjected to a check and then, if necessary, a repair. Because the injector body can be separated from the functional components, the injector body can remain on the internal combustion engine, while the functional components can be independently subjected to a check and, if necessary, a maintenance, and with little effort already preset new functional components of a second injector module an injector body of an internal combustion engine can be placed so that the internal combustion engine with only little installation effort is ready for use again. A preferred procedure provides that the injector module is broken down into its individual parts connector, servo valve, throttle plate, nozzle and nozzle retaining nut and the new functional components nozzle, throttle plate and servo valve with the new nozzle lock nut with the on Internal combustion engine remaining injector body to be screwed to a new injector. The remaining connection piece is preferably screwed to the disassembled functional components and the old nozzle retaining nut, brought back to the production facility and connected to a test rig, which simulates the connection situation in the internal combustion engine. After checking and repairing the injector module is transported back to the engine and can be used there to exchange the functional components of another injector. In this way, the repair is greatly simplified, since only the small functional components must be brought to the manufacturing facility, whereby the cost of transport and transport costs are significantly reduced.

Das erfindungsgemäße Verfahren ist dahingehend ausgebildet, dass das Verschrauben des Anschlussstücks mit den Funktionskomponenten zu dem Injektormodul am Ort der Brennkraftmaschine erfolgt, dass das Injektormodul danach zu einem vom Ort der Brennkraftmaschine entfernten Prüfstand transportiert wird und die Funktionskomponenten überprüft werden, und dass die Instandsetzung der Funktionskomponenten in einer vom Ort der Brennkraftmaschine entfernten Fertigungseinrichtung erfolgt, ohne dass der Injektorkörper ebenfalls zur Fertigungseinrichtung transportiert wird. Prinzipiell dient das Anschlussstück dazu, eine Prüfung der Funktionskomponenten im so gebildeten Injektormodul unabhängig vom Injektorkörper an einem Prüfstand durchführen zu können sowie als Transportsicherung für die im Injektormodul befindlichen Funktionskomponenten.The inventive method is designed such that the screwing of the connector with the functional components to the injector module takes place at the location of the internal combustion engine, that the injector module is then transported to a test bench remote from the location of the internal combustion engine and the functional components are checked, and that the repair of the functional components takes place in a remote from the location of the internal combustion engine manufacturing equipment, without the injector body is also transported to the manufacturing facility. In principle, the connection piece serves to be able to carry out a test of the functional components in the injector module thus formed independently of the injector body on a test stand and as a transport lock for the functional components located in the injector module.

In der Einbausituation an der Brennkraftmaschine werden die Funktionskomponenten Düse, Drosselplatte und Servoventil von der Düsenspannmutter am Injektorkörper fixiert. Nach dem Ausbau besteht somit die Gefahr, dass die Teile sich lockern bzw. bei Transport zur Instandsetzung verloren gehen. Das erfindungsgemäße Verfahren ist daher bevorzugt dahingehend weitergebildet, dass das Anschlussstück derart in die Düsenspannmutter eingesetzt wird, dass die Düse, die Drosselplatte und das Steuerventil in der Düsenspannmutter festgehalten werden.In the installation situation on the internal combustion engine, the functional components nozzle, throttle plate and servo valve are fixed by the nozzle retaining nut on the injector body. After the expansion There is thus the danger that the parts may become loose or be lost during transport for repair. The method according to the invention is therefore preferably developed in such a way that the connecting piece is inserted into the nozzle retaining nut in such a way that the nozzle, the throttle plate and the control valve are held in place in the nozzle retaining nut.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung schematisch dargstellten Ausführungsbeispieles näher erläutert.The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing.

In Fig. 1 ist mit 1 ein erfindungsgemäßer Injektor bezeichnet, bei welchem die Funktionskomponenten des Injektors in Form einer Düse 3, einer Drosselplatte 4 und eines Steuerventils 5 angeordnet sind, wobei die Funktionskomponenten mittels einer Düsenspannmutter 6 am Injektorkörper 7, der ein Speichervolumen enthält, fixiert sind.In Fig. 1 1 denotes an injector according to the invention, in which the functional components of the injector are arranged in the form of a nozzle 3, a throttle plate 4 and a control valve 5, wherein the functional components are fixed by means of a nozzle retaining nut 6 on the injector body 7, which contains a storage volume.

Zur Durchführung des erfindungsgemäßen Verfahrens wird die Verschraubung zwischen Injektorkörper 7 und Düsenspannmutter 6 gelöst und die Funktionskomponenten 3, 4, 5 abgenommen. In der Folge werden die Funktionskomponenten 3, 4, 5 mittels der Düsenspannmutter 6 mit einem Anschlussstück 8 zu dem in Fig. 2 gezeigten Injektormodul 2 verbunden, welches zum Einen die Funktionskomponenten 3, 4, 5 während des Transports zur Überprüfung bzw. Instandsetzung in der Düsenspannmutter 6 festhält und zum Anderen an den Prüfstand zum Überprüfen der Funktionskomponenten 3, 4, 5 im Injektormodul 2 angeschlossen werden kann.To carry out the method according to the invention, the screw connection between the injector body 7 and the nozzle retaining nut 6 is released and the functional components 3, 4, 5 are removed. As a result, the functional components 3, 4, 5 by means of the nozzle lock nut 6 with a connector 8 to the in Fig. 2 shown injector module 2, which holds on the one hand, the functional components 3, 4, 5 during transport for inspection or repair in the nozzle retaining nut 6 and on the other hand to the test stand for checking the functional components 3, 4, 5 in the injector module 2 can be connected.

Claims (2)

  1. Method for testing and repairing an injector for injecting fuel into the combustion chamber of an internal combustion engine, wherein the injector has a nozzle, a throttle plate and a control valve and also a nozzle clamping nut which holds the stated parts together and by means of which the stated parts are fastened to an injector body of the injector, characterized in that the functional components nozzle (3), throttle plate (4) and control valve (5) are separated from the injector body (7), an attachment piece (8) which serves for connecting the functional components (3, 4, 5) to a test stand is screwed by way of the nozzle clamping nut (6) to the functional components (3, 4, 5) to form an injector module (2), and the injector module (2) is connected to a test stand and subjected to testing and subsequently, if necessary, repair work, wherein the screwing of the attachment piece (8) to the functional components (3, 4, 5) to form the injector module (2) is performed in situ on the internal combustion engine, the injector module (2) is subsequently transported to a test stand at a location remote from the internal combustion engine, and the functional components (3, 4, 5) are tested, and the repair of the functional components (3, 4, 5) is performed in a manufacturing facility remote from the location of the internal combustion engine, without the injector body (7) likewise being transported to the manufacturing facility.
  2. Method according to Claim 1, characterized in that the attachment piece (8) is screwed to the nozzle clamping nut (6) such that the nozzle (3), the throttle plate (4) and the control valve (5) are held fixedly in the nozzle clamping nut (6).
EP11767597.5A 2010-09-22 2011-09-22 Method for testing and repairing a fuel injector Active EP2619441B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1578/2010A AT510462B1 (en) 2010-09-22 2010-09-22 METHOD FOR CHECKING AND REPAIRING A FUEL INJECTOR
PCT/AT2011/000390 WO2012037590A1 (en) 2010-09-22 2011-09-22 Method for testing and repairing a fuel injector

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EP2619441A1 EP2619441A1 (en) 2013-07-31
EP2619441B1 true EP2619441B1 (en) 2015-09-09

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EP11767597.5A Active EP2619441B1 (en) 2010-09-22 2011-09-22 Method for testing and repairing a fuel injector

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US (1) US9228552B2 (en)
EP (1) EP2619441B1 (en)
JP (1) JP5718469B2 (en)
KR (1) KR101495511B1 (en)
CN (1) CN103109073B (en)
AT (1) AT510462B1 (en)
WO (1) WO2012037590A1 (en)

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US10125713B2 (en) * 2016-12-06 2018-11-13 GM Global Technology Operations LLC Method of detecting a clogging of a fuel injector in an internal combustion engine

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Publication number Publication date
KR20130080846A (en) 2013-07-15
EP2619441A1 (en) 2013-07-31
JP2013537949A (en) 2013-10-07
US9228552B2 (en) 2016-01-05
WO2012037590A1 (en) 2012-03-29
AT510462B1 (en) 2014-04-15
CN103109073A (en) 2013-05-15
AT510462A1 (en) 2012-04-15
CN103109073B (en) 2016-06-15
US20130185908A1 (en) 2013-07-25
JP5718469B2 (en) 2015-05-13
KR101495511B1 (en) 2015-02-26

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