EP1907690A1 - Testing device for high pressure injectors of a common rail injection system, and method for testing high pressure injectors - Google Patents

Testing device for high pressure injectors of a common rail injection system, and method for testing high pressure injectors

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Publication number
EP1907690A1
EP1907690A1 EP06705771A EP06705771A EP1907690A1 EP 1907690 A1 EP1907690 A1 EP 1907690A1 EP 06705771 A EP06705771 A EP 06705771A EP 06705771 A EP06705771 A EP 06705771A EP 1907690 A1 EP1907690 A1 EP 1907690A1
Authority
EP
European Patent Office
Prior art keywords
display unit
flow rate
fuel return
rate measurement
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06705771A
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German (de)
French (fr)
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EP1907690B9 (en
EP1907690B1 (en
Inventor
Friedrich Lehnert
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Individual
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Individual
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Priority to PL06705771T priority Critical patent/PL1907690T3/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
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/002—Measuring fuel delivery of multi-cylinder injection pumps
    • 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
    • F02M65/006—Measuring or detecting fuel leakage of fuel injection apparatus
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F19/00—Complete banking systems; Coded card-freed arrangements adapted for dispensing or receiving monies or the like and posting such transactions to existing accounts, e.g. automatic teller machines
    • G07F19/20—Automatic teller machines [ATMs]
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F19/00—Complete banking systems; Coded card-freed arrangements adapted for dispensing or receiving monies or the like and posting such transactions to existing accounts, e.g. automatic teller machines
    • G07F19/20—Automatic teller machines [ATMs]
    • G07F19/205—Housing aspects of ATMs
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the present invention relates to a test device for high pressure injectors of a common rail injection system of an engine assembly, wherein the high pressure injectors each having a fuel return port for a fuel return line.
  • One possible source of error in the common-rail injection system may be a defective high-pressure injector. Such sources of error must be able to diagnose car workshops.
  • the source of error or the faulty high-pressure injector can be found out by comparing the resulting fuel return quantity of the individual cylinders of an engine unit depending on manufacturer specifications at idle or in corresponding speeds among each other.
  • the efficiency of a high-pressure injector may also be affected by the fact that the injection nozzle is dirty. There are known cleaning methods for contaminated high pressure injectors. However, it is not possible to immediately and quickly check the efficiency of the cleaning process or its effectiveness.
  • the return line is located on the side of the nozzle.
  • injectors from Delphi only one side-facing grommet is available.
  • the test tube must have a relatively large volume, since the engines have to run according to the manufacturer's specifications at idle and at appropriate speeds about 1 to 3 minutes and therefore runs back a lot of fuel. Even with a possible defect of an injector nozzle flows a much larger amount of fuel back.
  • the present invention Based on the cited prior art, the present invention, the object or the technical problem of specifying a test device and a method of the type mentioned above, which allows a reliable fault diagnosis, in particular by means of which the verification of the efficiency of a cleaning process is easily possible, and which can be used in a simple way in a variety of engines.
  • test device according to the invention is given by the features of independent claim 1.
  • Advantageous embodiments and further developments are specified in the dependent of the independent claim 1 directly or indirectly dependent claims.
  • test device is accordingly characterized by a flow rate measurement / display unit which can be detachably connected between the fuel return port and the fuel return line.
  • the testing device it is advantageously possible to measure the defectiveness within a circulatory system as a whole from high-pressure injectors.
  • the individual high-pressure injectors of a Engine checked with each other by means of the tester with respect to the return flow of the fuel in the fuel return line. If a high-pressure injector falls outside the frame with regard to the amount of reflux, it can be concluded from the values of the other high-pressure injectors that this high-pressure injector is defective or should first be cleaned in a first step.
  • the circulation of the fuel is closed, so that the possibility is opened to operate the engine for checking purposes over a longer period of time while observing or documenting any changes in the fuel return.
  • test device With the test device according to the invention is also possible in a simple manner to check the efficiency of a cleaning process. First, the flow rate measuring / display unit is mounted and the flow rate is measured. So then the cleaning process is performed. Then, the return flow is measured again by means of the flow rate measurement / display unit. If the cleaning process was successful, a uniform return flow of fuel is evident. If the reflow rates do not or only insignificantly change on an injector, it can be concluded that the high-pressure injector has a defect that can not be eliminated by cleaning procedures.
  • a particularly preferred embodiment is characterized in that between the fuel return port and the flow rate measurement / display unit, a first, in particular flexible, hose unit is arranged.
  • a second, in particular flexible, hose unit can be arranged between the flow rate measurement / display unit and the fuel return line.
  • the display unit can preferably be designed as a digital or pointing device.
  • a structurally particularly simple, economically producible and permanently reliable usable test device is characterized in that the flow rate measuring / display unit is designed as a transparent hollow profile with an internally in the longitudinal direction of the hollow profile slidably arranged float.
  • the hollow profile may preferably consist of glass or plastic.
  • a readable scale is provided on the hollow profile.
  • the flow rate measuring / display unit Depending on the size of the fuel return flow, which via the fuel return port, the flow rate measuring / display unit, the amount of flowing back into the fuel tank, causes depending on the size of a different floating of the float within the hollow profile. This makes it possible in a simple manner, especially in the presence of a mounted scale to read the D, flow rate. This embodiment is technically robust and suitable for use in rough workshop operation. In addition, reliable results are displayed.
  • the method according to the invention for testing the operability of high-pressure injectors of a common-rail injection system of an engine assembly is accordingly characterized in that a flow rate measurement / display unit is detachably used for a predeterminable time interval between the fuel return port of the high-pressure injector and the fuel return portion, and Subsequently, the engine assembly is operated over predetermined time intervals, so that the amount of the returning fuel is measured and / or displayed.
  • a particularly advantageous embodiment of the method according to the invention in terms of handling is characterized in that for producing a communication connection between the fuel return port of the high-pressure injector and the flow rate measurement / display unit and / or between the flow rate measurement / display unit and the fuel return line, one, in particular flexible, hose unit is detachable is connected.
  • a particularly advantageous embodiment of the method according to the invention is characterized in that the flow rate measuring / display unit is used in a first time interval, then the high pressure injectors is subjected to a cleaning process and then the flow rate measurement / display unit in a second time interval is used.
  • FIG. 1 is a highly schematic representation of the use of a test device with a flow rate measuring / display unit for a high pressure injector of a common rail injection system
  • Fig. 2 highly schematic representation of the high-pressure injector without
  • Embodiment of a flow rate measuring / display unit designed as a glass tube with plastic floating body and 4a to c highly schematic diagram of four high pressure injectors of a 4-cylinder unit with fuel circuit in the normal operating state (Fig. 4a), in the operating state when testing an injector (Fig.4b) and in the operating state when checking all four injectors (Fig. 4c).
  • the supplied fuel is led up to the injection nozzle and parts of the unneeded fuel flow back. If the injection nozzle or the high-pressure injector 50 is defective or contaminated, a greatly increased amount of fuel flows back into the fuel tank 56 via a fuel return connection 52 of the high-pressure injector 50 and via a connected fuel return line 54.
  • the reflux of the fuel is shown in the figures with the arrows R.
  • a test device 10 which has a flow rate measurement / display unit 12.
  • the fuel return line 54 is released from the fuel return port 52.
  • a connection between the fuel return connection 52 and the flow rate measurement / display unit 12 is established via a first flexible hose unit 20.
  • the flow rate measurement / display unit 12 is connected to the return line 54 via a second flexible hose unit 22.
  • the fuel return flow rate can now be determined and displayed via the flow rate measurement / display unit 12. If the flow rate measurement is carried out before and after a cleaning Performed operation of the high-pressure injector 50, it can be determined based on the display, whether the cleaning process was successful or if there is another defect.
  • the first hose unit 20 is released from the fuel return port 52 and the second hose unit 22 is released from the fuel return line 54. Subsequently, the fuel return line 54 is in turn connected via the fuel return port 52 to the high pressure injector 50.
  • FIG. 12.1 A constructive embodiment of the flow rate measurement / display unit 12 is shown schematically in FIG.
  • This unit 12.1 is designed as a glass tube having top and bottom terminal units 33 for the first tube unit 20 and second tube unit 22, wherein within the unit 12.1 a float body unit 14 is provided, which is longitudinally displaceable within the unit 12 and depending on the flow rate takes different positions. Furthermore, the unit 12.1 has a readable scale 16 by means of which the magnitude of the flow rate can be specified.
  • This embodiment provides a commercially viable test device available that can be easily used and ensures a durable reliable function even under tough workshop conditions.
  • Fig. 4 the four high-pressure injectors 50 of a 4-cylinder unit are shown, which is supplied via an injection line E from the fuel tank 56 from fuel and the fuel return line 54 in the direction R superfluous fuel back to the fuel tank 56.
  • Fig. 4a shows a highly schematic without further illustration of the necessary for the operation of the engine unit control, regulating and delivery units the normal operating condition.
  • Fig. 4b the state is shown, in which the left high-pressure injector 50 is checked.
  • the first flexible hose unit 20 is connected via the fuel return port 52 of the high pressure injector 50, which in turn is connected to the flow rate measuring / display unit 12.
  • the flow rate measurement / display unit 12 is in turn connected via a second flexible hose unit 22 to the return line 54, so that a total of in conjunction with the supply of the fuel in the injection direction E results in a fuel circuit.
  • an increased compared to the normal operating condition fuel quantity flows back, which is measured or displayed on the flow rate measurement / display unit 12.
  • Figure 4c illustrates the condition that all four high pressure injectors 50 are tested by means of the flow rate measurement / display unit 12, each high pressure injector 50 being located in communication with the flow rate meter / display unit 12 within a fuel flow loop.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Finance (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Accounting & Taxation (AREA)
  • Business, Economics & Management (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The device has a flow rate measuring unit/indicating unit (12) removably attached between a fuel return port (52) and a fuel return pipeline (54) of high-pressure injectors (50). Flexible tube units (20, 22) are arranged between the fuel return port and the unit (12), and the fuel return pipeline and the unit (12), respectively. A separate signaling unit (30) is connected to the unit (12).

Description

BESCHREIBUNG DESCRIPTION
Prüfeinrichtung für Hochdruck-Injektoren eines Common-Rail-Einspritzsystems und Verfahren zum Prüfen von Hochdruck-InjektorenTesting device for high pressure injectors of a common rail injection system and method for testing high pressure injectors
TECHNISCHES GEBIETTECHNICAL AREA
Die vorliegende Erfindung betrifft eine Prüfeinrichtung für Hochdruck-Injektoren eines Common-Rail-Einspritzsystems eines Motorenaggregats, wobei die Hochdruck-Injektoren jeweils einen Kraftstoffrücklaufanschluss für eine Kraftstoffrücklaufleitung aufweisen.The present invention relates to a test device for high pressure injectors of a common rail injection system of an engine assembly, wherein the high pressure injectors each having a fuel return port for a fuel return line.
Eine mögliche Fehlerquelle beim Common-Rail-Einspritzsystem kann ein defekter Hochdruck-Injektor sein. Derartige Fehlerquellen müssen KFZ- Werkstätten diagnostizieren können. Die Fehlerquelle beziehungsweise den fehlerhaften Hochdruck-Injektor kann man herausfinden, in dem man die anfallende Kraftstoffrücklaufmenge der einzelnen Zylinder eines Motorenaggregats je nach Herstellervorgaben im Leerlauf oder in entsprechenden Drehzahlen untereinander vergleicht.One possible source of error in the common-rail injection system may be a defective high-pressure injector. Such sources of error must be able to diagnose car workshops. The source of error or the faulty high-pressure injector can be found out by comparing the resulting fuel return quantity of the individual cylinders of an engine unit depending on manufacturer specifications at idle or in corresponding speeds among each other.
Der Wirkungsgrad eines Hochdruck-Injektors kann auch dadurch beeinträchtigt sein, dass die Einspritzdüse verschmutzt ist. Es sind Reinigungsverfahren für verschmutzte Hochdruck-Injektoren bekannt. Es ist jedoch nicht möglich, die Effizienz des Reinigungsvorgangs beziehungsweise dessen Wirksamkeit umgehend und rasch zu überprüfen.The efficiency of a high-pressure injector may also be affected by the fact that the injection nozzle is dirty. There are known cleaning methods for contaminated high pressure injectors. However, it is not possible to immediately and quickly check the efficiency of the cleaning process or its effectiveness.
STAND DER TECHNIKSTATE OF THE ART
Es ist bekannt, bei Hochdruck-Injektoren eines Common-Rail-Einspritzsystems im Rahmen einer Fehlerdiagnose die Kraftstoffrücklaufmenge anhand eines Prüfröhrchens zu überprüfen. Dazu entfernt man die Anschlüsse der Kraftstoffrücklaufleitung von den Injektoren und ersetzt diese durch ein Plexiglasröhrchen mit Originalsteckanschlüssen. Das Plexiglasröhrchen wird hierbei in einfacher Art und Weise von oben auf den Kraftstoffrücklaufleitungsanschluss des Injektors aufgesteckt. In manchen Fällen ist es nicht möglich das Prüfröhrchen aufzustecken, da nicht genügend Platz nach oben im Motorraum vorhanden ist. Abhängig von dem jeweiligen Hersteller werden jedoch auch Hochdruck-Injektoren eingesetzt, deren Anschlüsse für die Kraftstoffrücklaufleitung seitlich angeordnet sind. Dadurch ist ein einfaches Aufstecken des bekannten Prüfröhrchen nicht möglich. Bei Injektoren der Firma Siemens sitzt der Rücklauf seitlich an der Düse. Bei Injektoren der Firma Delphi steht lediglich eine seitlich nach oben weisende Tülle zur Verfügung. In manchen Fällen muss das Prüfröhrchen ein relativ großes Volumen aufweisen, da die Motoren zum Teil laut Herstellervorgaben im Leerlauf und unter entsprechenden Drehzahlen ca. 1 bis 3 Minuten laufen müssen und dementsprechend viel Kraftstoff zurückläuft. Auch bei einem eventuellen Defekt einer Injektordüse fließt eine wesentlich größere Kraftstoffmenge zurück.In the case of high-pressure injectors of a common-rail injection system, it is known to check the fuel return quantity on the basis of a test tube as part of a fault diagnosis. To do this, remove the connections of the fuel return line from the injectors and replace them with a Plexiglas tube with original plug connections. The plexiglass tube is here attached in a simple manner from above on the fuel return line connection of the injector. In some cases it is not possible to put on the test tube because there is not enough space up in the engine compartment. Depending on the manufacturer, however, high-pressure injectors are also used. whose connections for the fuel return line are arranged laterally. As a result, a simple plugging the known test tube is not possible. For Siemens injectors, the return line is located on the side of the nozzle. In the case of injectors from Delphi, only one side-facing grommet is available. In some cases, the test tube must have a relatively large volume, since the engines have to run according to the manufacturer's specifications at idle and at appropriate speeds about 1 to 3 minutes and therefore runs back a lot of fuel. Even with a possible defect of an injector nozzle flows a much larger amount of fuel back.
DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION
Ausgehend von dem genannten Stand der Technik liegt der vorliegenden Erfindung die Aufgabe beziehungsweise das technische Problem zugrunde, eine Prüfeinrichtung und ein Verfahren der eingangs genannten Art anzugeben, die eine zuverlässige Fehlerdiagnose ermöglicht, insbesondere mittels derer die Überprüfung der Effizienz eines Reinigungsvorganges problemlos möglich ist, und die in einfacher Art und Weise in den unterschiedlichsten Motoren eingesetzt werden kann.Based on the cited prior art, the present invention, the object or the technical problem of specifying a test device and a method of the type mentioned above, which allows a reliable fault diagnosis, in particular by means of which the verification of the efficiency of a cleaning process is easily possible, and which can be used in a simple way in a variety of engines.
Die erfindungsgemäße Prüfeinrichtung ist durch die Merkmale des unabhängigen Anspruchs 1 gegeben. Vorteilhafte Ausgestaltungen und Weiterbildungen sind in den von dem unabhängigen Anspruch 1 direkt oder indirekt abhängigen Ansprüche angegeben.The test device according to the invention is given by the features of independent claim 1. Advantageous embodiments and further developments are specified in the dependent of the independent claim 1 directly or indirectly dependent claims.
Das erfindungsgemäße Verfahren ist durch die Merkmale des unabhängigen Anspruchs 9 gegeben. Vorteilhafte Ausgestaltungen und Weiterbildungen sind in den von dem unabhängigen Anspruch 9 direkt oder indirekt abhängige Ansprüche angegeben.The inventive method is given by the features of independent claim 9. Advantageous embodiments and further developments are specified in the dependent directly from the independent claim 9 or claims.
Die erfindungsgemäße Prüfeinrichtung ist demgemäß gekennzeichnet durch eine Durchflussmengenmess-/anzeigeeinheit, die lösbar zwischen Kraftstoffrücklauf- anschluss und Kraftstoffrücklaufleitung anschließbar ist.The test device according to the invention is accordingly characterized by a flow rate measurement / display unit which can be detachably connected between the fuel return port and the fuel return line.
Mit der erfindungsgemäßen Prüfeinrichtung ist es vorteilhaft möglich, die Fehlerhaftigkeit innerhalb eines Kreislaufsystems insgesamt von Hochdruck- Injektoren zu messen. Hierzu werden die einzelnen Hochdruck-Injektoren eines Motors miteinander mittels der Prüfeinrichtung bezüglich der Rückflussmenge des Kraftstoffes in der Kraftstoffrücklaufleitung überprüft. Fällt ein Hochdruck- Injektor bezüglich der Rückflussmenge aus dem Rahmen, so kann aufgrund der Werte der übrigen Hochdruck-Injektoren daraus geschlossen werden, dass dieser Hochdruck-Injektor defekt ist oder in einem ersten Schritt zunächst einmal gereinigt werden sollte. Dabei ist der Kreislauf des Kraftstoffs geschlossen, so dass die Möglichkeit eröffnet wird, den Motor zu Überprüfungszwecken über einen längeren Zeitraum zu betreiben und dabei eventuellen Veränderungen des Kraftstoffrückflusses zu beobachten beziehungsweise zu dokumentieren.With the testing device according to the invention, it is advantageously possible to measure the defectiveness within a circulatory system as a whole from high-pressure injectors. For this purpose, the individual high-pressure injectors of a Engine checked with each other by means of the tester with respect to the return flow of the fuel in the fuel return line. If a high-pressure injector falls outside the frame with regard to the amount of reflux, it can be concluded from the values of the other high-pressure injectors that this high-pressure injector is defective or should first be cleaned in a first step. In this case, the circulation of the fuel is closed, so that the possibility is opened to operate the engine for checking purposes over a longer period of time while observing or documenting any changes in the fuel return.
Mit der erfindungsgemäßen Prüfvorrichtung ist ebenfalls in einfacher Art und Weise möglich, die Effizienz eines Reinigungsvorganges zu prüfen. Zunächst wird die Durchflussmengenmess-/anzeigeeinheit montiert und die Durchflussmenge gemessen. So dann wird der Reinigungsvorgang durchgeführt. Dann wird erneut der Rückfluss mittels der Durchflussmengenmess-/anzeigeeinheit gemessen. War der Reinigungsvorgang erfolgreich, zeigt sich eine gleichmäßige Rückflussmenge an Kraftstoff. Falls sich die Rückflussmengen nicht oder nur unwesentlich an einem Injektor verändert, kann daraus geschlossen werden, dass der Hochdruck- Injektor einen Defekt aufweist, der nicht durch Reinigungsverfahren beseitigt werden kann.With the test device according to the invention is also possible in a simple manner to check the efficiency of a cleaning process. First, the flow rate measuring / display unit is mounted and the flow rate is measured. So then the cleaning process is performed. Then, the return flow is measured again by means of the flow rate measurement / display unit. If the cleaning process was successful, a uniform return flow of fuel is evident. If the reflow rates do not or only insignificantly change on an injector, it can be concluded that the high-pressure injector has a defect that can not be eliminated by cleaning procedures.
Eine besonders bevorzugte Ausgestaltung zeichnet sich dadurch aus, dass zwischen dem Kraftstoff rücklaufanschluss und der Durchflussmengenmess-/ anzeigeeinheit eine erste, insbesondere flexible, Schlaucheinheit angeordnet ist. Dabei kann gemäß einer weiteren vorteilhaften Ausgestaltung zwischen der Durchflussmengenmess- /anzeigeeinheit und der Kraftstoffrücklaufleitung eine zweite, insbesondere flexible, Schlaucheinheit angeordnet werden.A particularly preferred embodiment is characterized in that between the fuel return port and the flow rate measurement / display unit, a first, in particular flexible, hose unit is arranged. In this case, according to a further advantageous embodiment, a second, in particular flexible, hose unit can be arranged between the flow rate measurement / display unit and the fuel return line.
Durch das Vorsehen von flexiblen Schlaucheinheiten vor und /oder hinter der Durchflussmengenmess- /anzeigeeinheit ist ein problemloser Einsatz der Prüfeinrichtung auch bei beengten Raumverhältnissen innerhalb des jeweiligen Motorenaggregats möglich. Es ist auch denkbar, dass eine separate Anzeigeeinheit vorhanden ist, die mit der Durchflussmengenmess- /anzeigeeinheit kommuniziert.By providing flexible hose units in front of and / or behind the flow rate measuring / display unit, trouble-free use of the testing device is possible even in confined spaces within the respective engine assembly. It is also conceivable that there is a separate display unit which communicates with the flow rate measurement / display unit.
Die Anzeigeeinheit kann bevorzugt als digitale oder Zeigereinheit ausgebildet sein. Ein konstruktiv besonders einfache, wirtschaftlich herstellbare und dauerhaft zuverlässig einsetzbare Prüfeinrichtung zeichnet sich dadurch aus, dass die Durchflussmengenmess-/anzeigeeinheit als transparentes Hohlprofil mit einem innenseitig in Längsrichtung des Hohlprofils verschieblich angeordnetem Schwimmkörper ausgebildet ist. Das Hohlprofil kann bevorzugt aus Glas oder Kunststoff bestehen.The display unit can preferably be designed as a digital or pointing device. A structurally particularly simple, economically producible and permanently reliable usable test device is characterized in that the flow rate measuring / display unit is designed as a transparent hollow profile with an internally in the longitudinal direction of the hollow profile slidably arranged float. The hollow profile may preferably consist of glass or plastic.
Weiterhin ist gemäß einer vorteilhaften Ausgestaltung an dem Hohlprofil eine ablesbare Skala vorhanden.Furthermore, according to an advantageous embodiment, a readable scale is provided on the hollow profile.
In Abhängigkeit der Kraftstoffrückflussmenge, die über den Kraftstoffrücklauf- anschluss, die Durchflussmengenmess-/anzeigeeinheit die Menge des in den Kraftstofftank zurückfließenden Kraftstoffes, bewirkt je nach Größe ein unterschiedliches Aufschwimmen des Schwimmkörpers innerhalb des Hohlprofils. Dadurch ist es in einfacher Art und Weise möglich, insbesondere bei Vorhandensein einer montierten Skala, die D,urchflussmenge abzulesen. Diese Ausgestaltung ist technisch robust und für den Einsatz im rauhen Werkstattbetrieb geeignet. Darüber hinaus werden zuverlässige Ergebnisse angezeigt.Depending on the size of the fuel return flow, which via the fuel return port, the flow rate measuring / display unit, the amount of flowing back into the fuel tank, causes depending on the size of a different floating of the float within the hollow profile. This makes it possible in a simple manner, especially in the presence of a mounted scale to read the D, flow rate. This embodiment is technically robust and suitable for use in rough workshop operation. In addition, reliable results are displayed.
Das erfindungsgemäße Verfahren zum Prüfen der Funktionsfähigkeit von Hochdruck-Injektoren eines Common-Rail-Einspritzsystems eines Motorenaggregats, zeichnet sich demgemäß dadurch aus, dass für ein vorgebbaren Zeitintervall zwischen dem Kraftstoffrücklaufanschluss des Hochdruck-Injektors und der Kraftstoffrücklaufteilung eine Durchflussmengenmess-/anzeigeeinheit lösbar eingesetzt wird und anschließend das Motorenaggregat über vorgebbare Zeitintervalle betrieben wird, so dass die Menge des zurückfließenden Kraftstoffs gemessen und /oder angezeigt wird.The method according to the invention for testing the operability of high-pressure injectors of a common-rail injection system of an engine assembly is accordingly characterized in that a flow rate measurement / display unit is detachably used for a predeterminable time interval between the fuel return port of the high-pressure injector and the fuel return portion, and Subsequently, the engine assembly is operated over predetermined time intervals, so that the amount of the returning fuel is measured and / or displayed.
Eine hinsichtlich der Handhabung besonders vorteilhafte Ausgestaltung des erfindungsgemäßen Verfahrens zeichnet sich dadurch aus, dass zum Herstellen einer Kommunikationsverbindung zwischen Kraftstoffrücklaufanschluss des Hochdruck-Injektors und der Durchflussmengenmess-/anzeigeeinheit und/oder zwischen der Durchflussmengenmess-/anzeigeeinheit und der Kraftstoffrücklaufleitung eine, insbesondere flexible Schlaucheinheit lösbar angeschlossen wird.A particularly advantageous embodiment of the method according to the invention in terms of handling is characterized in that for producing a communication connection between the fuel return port of the high-pressure injector and the flow rate measurement / display unit and / or between the flow rate measurement / display unit and the fuel return line, one, in particular flexible, hose unit is detachable is connected.
Um in einfacher Art und Weise die Funktionalität sämtlicher Hochdruck- Injektoren im Vergleich untereinander überprüfen zu können, zeichnet sich eine besonders vorteilhafte Weiterbildung dadurch aus, dass für jeden Hochdruck- Injektoren des Motorenaggregats jeweils eine Durchflussmengenmess-/ anzeigeeinheit innerhalb des vorgebbaren Zeitintervalls eingesetzt wird.In order to be able to check the functionality of all high-pressure injectors in comparison with one another in a simple manner, one becomes apparent Particularly advantageous development characterized in that for each high-pressure injectors of the engine unit each a flow rate measurement / display unit is used within the predetermined time interval.
Um die Effizienz eines durchgeführten Reinigungsprozesses zu dokumentieren zeichnet sich eine besonders vorteilhafte Ausgestaltung des erfindungsgemäßen Verfahrens dadurch aus, dass die Durchflussmengenmess- /anzeigeeinheit in einem ersten Zeitintervall eingesetzt wird, anschließend die Hochdruck-Injektoren einem Reinigungsprozess unterzogen wird und dann die Durchflussmengenmess /anzeigeeinheit in einem zweiten Zeitintervall eingesetzt wird.To document the efficiency of a performed cleaning process, a particularly advantageous embodiment of the method according to the invention is characterized in that the flow rate measuring / display unit is used in a first time interval, then the high pressure injectors is subjected to a cleaning process and then the flow rate measurement / display unit in a second time interval is used.
Weitere Ausführungsformen und Vorteile der Erfindung ergeben sich durch die in den Ansprüchen ferner aufgeführten Merkmale sowie durch das nachstehend angegebene Ausführungsbeispiel. Die Merkmale der Ansprüche können in beliebiger Weise miteinander kombiniert werden, insoweit sie sich nicht offensichtlich gegenseitig ausschließen.Further embodiments and advantages of the invention will become apparent from the features further listed in the claims and by the embodiment given below. The features of the claims may be combined in any manner as far as they are not obviously mutually exclusive.
KURZE BESCHREIBUNG DER ZEICHNUNGBRIEF DESCRIPTION OF THE DRAWING
Die Erfindung sowie vorteilhafte Ausführungsformen und Weiterbildungen derselben werden im Folgenden anhand des in der Zeichnung dargestellten Beispiels näher beschrieben und erläutert. Die der Beschreibung und der Zeichnung zu entnehmenden Merkmale können einzeln für sich oder zu mehreren in beliebiger Kombination erfindungsgemäß angewandt werden. Es zeigen:The invention and advantageous embodiments and developments thereof are described in more detail below and explained with reference to the example shown in the drawing. The features to be taken from the description and the drawing can be applied individually according to the invention or to a plurality of them in any desired combination. Show it:
Fig. 1 stark schematisierte Darstellung des Einsatzes einer Prüfeinrichtung mit einer Durchflussmengenmess- /anzeigeeinheit für einen Hochdruck-Injektor eines Common-Rail-Einspritzsystems,1 is a highly schematic representation of the use of a test device with a flow rate measuring / display unit for a high pressure injector of a common rail injection system,
Fig. 2 stark schematisierte Darstellung des Hochdruck-Injektors ohneFig. 2 highly schematic representation of the high-pressure injector without
Prüfeinrichtung bei angeschlossener Kraftstoffrücklaufleitung,Testing device with connected fuel return line,
Fig. 3 stark schematisierte Darstellung einer konstruktivenFig. 3 highly schematic representation of a constructive
Ausführungsform einer Durchflussmengenmess- /anzeigeeinheit, ausgebildet als Glasröhrchen mit Kunststoffschwimmkörper und Fig. 4a bis c stark schematisierte Prinzipdarstellung von vier Hochdruck- Injektoren eines 4-Zylinderaggregats mit Kraftstoffkreislauf im normalen Betriebszustand (Fig. 4a), im Betriebszustand beim Prüfen eines Injektors (Fig.4b) und im Betriebszustand beim Überprüfen aller vier Injektoren (Fig. 4c).Embodiment of a flow rate measuring / display unit, designed as a glass tube with plastic floating body and 4a to c highly schematic diagram of four high pressure injectors of a 4-cylinder unit with fuel circuit in the normal operating state (Fig. 4a), in the operating state when testing an injector (Fig.4b) and in the operating state when checking all four injectors (Fig. 4c).
WEGE ZUM AUSFÜHREN DER ERFINDUNGWAYS FOR CARRYING OUT THE INVENTION
In Fig. 2 sind stark schematisiert die Kraftstoff fließ Verhältnisse bei einem Hochdruck-Injektor eines Common-Rail-Einspritzsystems eines nicht näher dargestellten Motorenaggregats dargestellt.In Fig. 2, the fuel flow conditions in a high-pressure injector of a common rail injection system of a motor assembly, not shown in detail are highly schematized.
Aus einem Kraftstofftank 56 wird einem Hochdruck-Injektor 50 Kraftstoff zugeführt. Sämtliche Steuer-, Regelungs,- und Förderbaueinheiten sind in den Figuren nicht dargestellt. Die Fließrichtung des Kraftstoffes bis hin zum Einspritzort ist in den Figuren mit Pfeilen E dargestellt.From a fuel tank 56, fuel is supplied to a high-pressure injector 50. All control, regulation, and Förderbaueinheiten are not shown in the figures. The direction of flow of the fuel up to the point of injection is shown in the figures with arrows E.
Innerhalb des Hochdruck-Injektors 50 wird der zugeführte Kraftstoff bis heran zur Einspritzdüse geführt und Teile des nicht benötigten Kraftstoffs fließen zurück. Ist die Einspritzdüse beziehungsweise der Hochdruck-Injektor 50 defekt oder verschmutzt, fließt eine stark erhöhte Kraftstoffmenge über einen Kraftstoffrück- laufanschluss 52 des Hochdruck-Injektors 50 und über eine angeschlossene Kraftstoffrücklaufleitung 54 in den Kraftstofftank 56 zurück. Der Rückfluss des Kraftstoffes ist in den Figuren mit den Pfeilen R dargestellt.Within the high-pressure injector 50, the supplied fuel is led up to the injection nozzle and parts of the unneeded fuel flow back. If the injection nozzle or the high-pressure injector 50 is defective or contaminated, a greatly increased amount of fuel flows back into the fuel tank 56 via a fuel return connection 52 of the high-pressure injector 50 and via a connected fuel return line 54. The reflux of the fuel is shown in the figures with the arrows R.
Um zu überprüfen, ob der Hochdruck-Injektor 50 defekt ist oder ob ein zuvor erfolgter Reinigungsvorgang Verbesserungen mit sich gebracht hat, wird gemäß Fig. 1 eine Prüfeinrichtung 10 eingesetzt, die eine Durchflussmengenmess- /anzeigeeinheit 12 aufweist. In einem ersten Schritt wird die Kraftstoff rück- laufleitung 54 von dem Kraftstoffrücklaufanschluss 52 gelöst. Daran anschließend wird über eine erste flexible Schlaucheinheit 20 eine Verbindung zwischen dem Kraftstoffrücklaufanschluss 52 und der Durchflussmengenmess-/anzeigeeinheit 12 hergestellt. Weiterhin wird die Durchflussmengenmess-/anzeigeeinheit 12 über eine zweite flexible Schlaucheinheit 22 mit der Rücklaufleitung 54 verbunden. Beim Betrieb des Hochdruck-Injektors 50 kann nunmehr die Kraftstoffrückflussmenge über die Durchflussmengenmess-/anzeigeeinheit 12 ermittelt und angezeigt werden. Wird die Durchf lussmengenmessung vor und nach einem Reinigungs- Vorgangs des Hochdruck-Injektors 50 durchgeführt, so kann aufgrund der Anzeige ermittelt werden, ob der Reinigungsvorgang erfolgreich war oder ob ein anderer Defekt vorliegt.In order to check whether the high-pressure injector 50 is defective or whether a previously performed cleaning process has brought about improvements, according to FIG. 1 a test device 10 is used, which has a flow rate measurement / display unit 12. In a first step, the fuel return line 54 is released from the fuel return port 52. Subsequently, a connection between the fuel return connection 52 and the flow rate measurement / display unit 12 is established via a first flexible hose unit 20. Furthermore, the flow rate measurement / display unit 12 is connected to the return line 54 via a second flexible hose unit 22. During operation of the high-pressure injector 50, the fuel return flow rate can now be determined and displayed via the flow rate measurement / display unit 12. If the flow rate measurement is carried out before and after a cleaning Performed operation of the high-pressure injector 50, it can be determined based on the display, whether the cleaning process was successful or if there is another defect.
Es ist auch möglich, eine separate Auswerteinheit 30 an die Durchfluss- mengenmess-/anzeigeeinheit 12 anzuschließen, die die gemessene Ist- Durchflussmenge beispielsweise mit gespeicherten Soll-Durchflussmengen vergleicht und auswertet.It is also possible to connect a separate evaluation unit 30 to the flow rate measurement / display unit 12, which compares and evaluates the measured actual flow rate, for example, with stored desired flow rates.
Sobald der Messvorgang beendet ist, wird die erste Schlaucheinheit 20 von dem Kraftstoffrücklaufanschluss 52 gelöst und die zweite Schlaucheinheit 22 wird von der Kraftstoffrücklaufleitung 54 gelöst. Daran anschließend wird die Kraftstoffrücklaufleitung 54 wiederum über den Kraftstoffrücklaufanschluss 52 an den Hochdruck-Injektor 50 angeschlossen.Once the measuring operation is completed, the first hose unit 20 is released from the fuel return port 52 and the second hose unit 22 is released from the fuel return line 54. Subsequently, the fuel return line 54 is in turn connected via the fuel return port 52 to the high pressure injector 50.
Eine konstruktive Ausführungsform der Durchflussmengenmess-/anzeigeeinheit 12 ist in Fig. 3 schematisch dargestellt. Diese Einheit 12.1 ist als Glasröhrchen ausgebildet, das oberseitig und unterseitig Anschlusseinheiten 33 für die erste Schlaucheinheit 20 beziehungsweise zweite Schlaucheinheit 22 aufweist, wobei innerhalb der Einheit 12.1 eine Schwimmkörpereinheit 14 vorhanden ist, die längs- verschieblich innerhalb der Einheit 12 gelagert ist und je nach Durchflussmenge unterschiedliche Positionen einnimmt. Des Weiteren besitzt die Einheit 12.1 eine ablesbare Skala 16 mittels derer die Größenordnung der Durchflussmenge spezifiziert werden kann. Diese Ausführungsform stellt eine wirtschaftlich günstig herstellbare Prüfvorrichtung zur Verfügung, die einfach eingesetzt werden kann und auch unter robusten Werkstattbedingungen eine dauerhaft zuverlässige Funktion gewährleistet.A constructive embodiment of the flow rate measurement / display unit 12 is shown schematically in FIG. This unit 12.1 is designed as a glass tube having top and bottom terminal units 33 for the first tube unit 20 and second tube unit 22, wherein within the unit 12.1 a float body unit 14 is provided, which is longitudinally displaceable within the unit 12 and depending on the flow rate takes different positions. Furthermore, the unit 12.1 has a readable scale 16 by means of which the magnitude of the flow rate can be specified. This embodiment provides a commercially viable test device available that can be easily used and ensures a durable reliable function even under tough workshop conditions.
In Fig. 4 sind stark schematisiert die vier Hochdruck-Injektoren 50 eines 4-Zylinderaggregats dargestellt, denen über eine Einspritzleitung E vom Kraftstofftank 56 aus Kraftstoff zugeführt wird und die über die Kraftstoffrücklaufleitung 54 in Richtung R überflüssigen Kraftstoff wieder dem Kraftstofftank 56 zuführen.In Fig. 4, the four high-pressure injectors 50 of a 4-cylinder unit are shown, which is supplied via an injection line E from the fuel tank 56 from fuel and the fuel return line 54 in the direction R superfluous fuel back to the fuel tank 56.
Fig. 4a zeigt stark schematisiert ohne nähere Darstellung der für den Betrieb des Motoraggregats erforderlichen Steuer-, Regel- und Fördereinheiten den normalen Betriebszustand. In Fig. 4b ist der Zustand dargestellt, in dem der linke Hochdruck-Injektor 50 geprüft wird. Hierbei ist über den Kraftstoffrücklaufanschluss 52 des Hochdruck- Injektors 50 die erste flexible Schlaucheinheit 20 angeschlossen, die wiederum an die Durchflussmengenmess-/anzeigeeinheit 12 angeschlossen ist. Die Durchfluss- mengenmess-/anzeigeeinheit 12 ist wiederum über eine zweite flexible Schlaucheinheit 22 an die Rücklaufleitung 54 angeschlossen, so dass sich insgesamt in Verbindung mit der Zuführung des Kraftstoffs im Einspritzrichtung E wiederum ein Kraftstoffkreislauf ergibt. Bei Störungen des entsprechenden Hochdruck-Injektors 50 fließt eine gegenüber dem normalen Betriebszustand erhöhte Kraftstoff menge zurück, was über die Durchflussmengenmess-/ anzeigeeinheit 12 gemessen beziehungsweise angezeigt wird.Fig. 4a shows a highly schematic without further illustration of the necessary for the operation of the engine unit control, regulating and delivery units the normal operating condition. In Fig. 4b, the state is shown, in which the left high-pressure injector 50 is checked. Here, the first flexible hose unit 20 is connected via the fuel return port 52 of the high pressure injector 50, which in turn is connected to the flow rate measuring / display unit 12. The flow rate measurement / display unit 12 is in turn connected via a second flexible hose unit 22 to the return line 54, so that a total of in conjunction with the supply of the fuel in the injection direction E results in a fuel circuit. In case of disturbances of the corresponding high-pressure injector 50, an increased compared to the normal operating condition fuel quantity flows back, which is measured or displayed on the flow rate measurement / display unit 12.
In Fig. 4c ist der Zustand dargestellt, der alle vier Hochdruck-Injektoren 50 mittels der Durchflussmengenmess-/ anzeigeeinheit 12 geprüft werden, wobei jeder Hochdruck-Injektor 50 in Verbindung mit der Durchflussmengenmess-/ anzeigeeinheit 12 innerhalb eines Kraftstoffflusskreislaufs angeordnet ist. Figure 4c illustrates the condition that all four high pressure injectors 50 are tested by means of the flow rate measurement / display unit 12, each high pressure injector 50 being located in communication with the flow rate meter / display unit 12 within a fuel flow loop.

Claims

Ansprücheclaims
01. Prüfeinrichtung (10) für Hochdruck-Injektoren (50) eines Common-Rail- Einspritzsystems eines Motorenaggregats, wobei die Hochdruck- Injektoren (50) jeweils einen Kraftstoffrücklaufanschluss (52) für eine Kraftstoffrücklaufleitung (54) aufweisen,01. Test device (10) for high-pressure injectors (50) of a common rail injection system of an engine assembly, wherein the high-pressure injectors (50) each have a fuel return port (52) for a fuel return line (54),
- gekennzeichnet durch- marked by
- eine Durchflussmengenmess-/anzeigeeinheit (12), die lösbar zwischen Kraftstoffrücklaufanschluss (52) und Kraftstoffrücklaufleitung (54) anschließbar ist.- A flow rate measurement / display unit (12) which is detachably connectable between the fuel return port (52) and the fuel return line (54).
02. Prüfeinrichtung nach Anspruch 1,02. Test device according to claim 1,
- dadurch gekennzeichnet, dass- characterized in that
- zwischen dem Kraftstoffrücklaufanschluss (52) und der Durchfluss- mengenmess-/anzeigeeinheit (12) eine erste, insbesondere flexible, Schlaucheinheit (20) angeordnet ist.- Between the fuel return port (52) and the flow rate measurement / display unit (12) a first, in particular flexible, hose unit (20) is arranged.
03. Prüfeinrichtung nach Anspruch 1 oder 2,03. Test device according to claim 1 or 2,
- dadurch gekennzeichnet, dass- characterized in that
- zwischen der Durchflussmengenmess-/anzeigeeinheit (12) und der Kraftstoffrücklaufleitung (54) eine zweite, insbesondere flexible, Schlaucheinheit (22) angeordnet ist.- Between the flow rate measurement / display unit (12) and the fuel return line (54) a second, in particular flexible, hose unit (22) is arranged.
04. Prüfeinrichtung nach einem oder mehreren der vorstehenden Ansprüche,04. Test device according to one or more of the preceding claims,
- dadurch gekennzeichnet, dass- characterized in that
- an die Durchflussmengenmess-/anzeigeeinheit (12) eine separate Anzeigeeinheit (30) angeschlossen ist.- A separate display unit (30) is connected to the flow rate measurement / display unit (12).
05. Prüfeinrichtung nach einem oder mehreren der vorstehenden Ansprüche,05. Test device according to one or more of the preceding claims,
- dadurch gekennzeichnet, dass- characterized in that
- die Durchflussmengenmess-/anzeigeeinheit (12) /Anzeigeeinheit (30) eine digitale oder Zeigeranzeigeeinheit aufweist. - The flow rate measurement / display unit (12) / display unit (30) has a digital or pointer display unit.
06. Prüfeinrichtung nach einem oder mehreren der Ansprüche 1 bis 3,06. Test device according to one or more of claims 1 to 3,
- dadurch gekennzeichnet, dass- characterized in that
- die Durchflussmengenmess-/anzeigeeinheit (12) als transparentes Hohlprofil (12.1) mit einem innenseitig in Längsrichtung des Hohlprofils (12.1) verschieblich angeordnetem Schwimmkörper (14) ausgebildet ist.- The flow rate measuring / display unit (12) is designed as a transparent hollow profile (12.1) with an inside in the longitudinal direction of the hollow profile (12.1) slidably disposed float (14).
07. Prüfeinrichtung nach Anspruch 6, dadurch gekennzeichnet, dass07. Test device according to claim 6, characterized in that
- das Hohlprofil (12.1) aus Glas oder Kunststoff besteht.- The hollow profile (12.1) made of glass or plastic.
08. Prüf einrichtung nach Anspruch 6 oder 7,08. Test device according to claim 6 or 7,
- dadurch gekennzeichnet, dass- characterized in that
- das Hohlprofil (12.1) eine ablesbare Skala aufweist.- The hollow profile (12.1) has a readable scale.
09. Verfahren zum Prüfen der Funktionsfähigkeit von Hochdruck-Injektoren (50) eines Common-Rail-Einspritzsystems eines Motorenaggregats,09. Method for testing the operability of high-pressure injectors (50) of a common-rail injection system of an engine assembly,
- dadurch gekennzeichnet, dass- characterized in that
- für ein vorgebbaren Zeitintervall zwischen dem Kraftstoffrücklauf- anschluss (52) des Hochdruck-Injektors (50) und der Kraftstoffrück- laufteilung (54) eine Durchflussmengenmess-/anzeigeeinheit (12) lösbar eingesetzt wird und anschließend das Motorenaggregat über vorgebbare Zeitintervalle betrieben wird, so dass die Menge des zurückfließenden Kraftstoffs gemessen und/oder angezeigt wird.for a predefinable time interval between the fuel return connection (52) of the high-pressure injector (50) and the fuel return divider (54), a flow rate measuring / indicating unit (12) is detachably inserted and then the engine assembly is operated over predefinable time intervals, then that the amount of the returning fuel is measured and / or displayed.
10. Verfahren nach Anspruch 9,10. The method according to claim 9,
- dadurch gekennzeichnet, dass- characterized in that
- zum Herstellen einer Kommunikationsverbindung zwischen Kraftstoff- rücklaufanschluss (52) des Hochdruck-Injektors (50) und der Durchfluss- tnengenmess-/anzeigeeinheit (12) und/oder zwischen der Durchfluss- mengenmess-/anzeigeeinheit (12) und der Kraftstoffrücklaufleitung eine, insbesondere flexible Schlaucheinheit (20, 22) lösbar angeschlossen wird.for establishing a communication connection between the fuel return port (52) of the high-pressure injector (50) and the flow rate measurement / display unit (12) and / or between the flow rate measurement / display unit (12) and the fuel return line one, in particular flexible hose unit (20, 22) is detachably connected.
11. Verfahren nach Anspruch 9 oder 10,11. The method according to claim 9 or 10,
- dadurch gekennzeichnet, dass- characterized in that
- für jeden Hochdruck-Injektoren (50) des Motorenaggregats jeweils eine Durchflussmengenmess-/anzeigeeinheit (12) innerhalb des vorgebbaren Zeitintervalls eingesetzt wird.- one for each high-pressure injector (50) of the engine unit Flow rate measurement / display unit (12) is used within the predetermined time interval.
12. Verfahren nach einem oder mehreren der Ansprüche 9 bis 11,12. The method according to one or more of claims 9 to 11,
- dadurch gekennzeichnet, dass- characterized in that
- die Durchflussmengenmess-/anzeigeeinheit (12) in einem ersten Zeitintervall eingesetzt wird,the flow rate measurement / display unit (12) is used in a first time interval,
- anschließend die Hochdruck-Injektoren einem Reinigungsprozess unterzogen wird und dann- Then the high-pressure injectors is subjected to a cleaning process and then
- die Durchflussmengenmess-/anzeigeeinheit (12) in einem zweiten Zeitintervall eingesetzt wird. - The flow rate measurement / display unit (12) is used in a second time interval.
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US8047062B2 (en) 2011-11-01
EP1907690B9 (en) 2011-09-07
EP1907690B1 (en) 2011-03-30
DE112006002615A5 (en) 2008-06-26
ES2363790T3 (en) 2011-08-16
PL1907690T3 (en) 2011-09-30
DE502006009213D1 (en) 2011-05-12
ATE503925T1 (en) 2011-04-15
JP5094718B2 (en) 2012-12-12
WO2007012298A1 (en) 2007-02-01
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US20090114035A1 (en) 2009-05-07
DK1907690T3 (en) 2011-07-11

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