EP1402170B1 - Control module for an injector of an accumulator injection system - Google Patents

Control module for an injector of an accumulator injection system Download PDF

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Publication number
EP1402170B1
EP1402170B1 EP02754296A EP02754296A EP1402170B1 EP 1402170 B1 EP1402170 B1 EP 1402170B1 EP 02754296 A EP02754296 A EP 02754296A EP 02754296 A EP02754296 A EP 02754296A EP 1402170 B1 EP1402170 B1 EP 1402170B1
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EP
European Patent Office
Prior art keywords
control
valve body
control module
injector
module according
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Revoked
Application number
EP02754296A
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German (de)
French (fr)
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EP1402170B8 (en
EP1402170A1 (en
Inventor
Wolfgang Bloching
Willibald SCHÜRZ
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Continental Automotive GmbH
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Siemens AG
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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
    • 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
    • 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
    • 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
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1866—Valve seats or member ends having multiple cones

Definitions

  • the present invention relates to a control module for an injector of a storage injection system for controlling and guiding an injector valve body.
  • Injectors for storage injection systems are known in different configurations. Such a known injector is shown for example in Figure 4.
  • fuel is supplied into the surrounding area of the nozzle needle via a high-pressure feed line 30.
  • the nozzle needle 36 is in contact with a control piston 31, which is arranged with one end in a control chamber 32. Via a control valve 33, the pressure in the control chamber 32 can be controlled in a known manner, so that the control chamber 32 with a tank T is connectable.
  • the control chamber 32 opposite side of the control piston 31 is in contact with a low-pressure space 34, which is connected via a low pressure drain 35 to the tank T.
  • the nozzle needle 36 can be lifted in a known manner from its seat and an injection takes place.
  • a control module for an injector of a storage injection system for controlling and guiding a valve body which comprises: a high-pressure inlet for supplying fuel, a guide device for guiding the valve body, a one-piece springless control chamber, a control piston arranged in the control piston, which indirectly with the valve body is in communication and at its end opposite the control chamber with a high pressure area in the valve body is in communication, an inlet throttle, which provides a connection between the high-pressure inlet and control chamber, and an outlet throttle, which in both the open and in the closed Position of the injector provides a connection between the control chamber and a control valve, wherein a nozzle spring is provided for returning the valve body, which surrounds the valve body and is arranged in the high-pressure region.
  • the EP 0 427 266 shows a high-pressure injection unit comprising a housing with a fuel injection timing valve and a stroke-regulating solenoid actuator, which is designed to adjust the amount of fuel to be injected during an injection cycle by means of a stroke-regulating element, which is intended to take a stop portion of an injection valve body and is further embodied optionally, assuming a predetermined stroke regulating position in response to a stroke regulating solenoid actuator energized in advance of the injection timing.
  • the control module according to the invention for an injector allows a permanently leak-free injector in that all functional elements for controlling and guiding the valve body of the injector are integrated in one component. As a result, a minimum number of high-pressure sealing surfaces is achieved.
  • the high-pressure sealing surfaces are formed only as planes, so that no cylindrical guide surfaces, which are necessary as high-pressure sealing surfaces in the prior art, are available. Thereby, an injector can be provided without the existing in the prior art permanent leakage.
  • a high pressure inlet, a guide device for guiding the valve body of the injector, a control chamber, an inlet throttle and an outlet throttle are arranged.
  • a control piston is arranged, which is directly or indirectly connected to the valve body in connection.
  • the control piston stands with its end opposite the control chamber with a high pressure area on the valve body in connection.
  • the control module according to the invention can thus be constructed very compact, so that the overall dimensions of the injector can be further reduced in comparison with the prior art. Furthermore, can be dispensed with by the control module according to the invention in particular on the existing in the prior art long high-pressure line, which is usually performed by the entire injector and can lead to strength problems in addition to their complex production.
  • control module further comprises a bypass throttle, which provides a connection between the high-pressure inlet and the control valve of the injector.
  • a shortened closing time of the injector can be made possible with the bypass throttle.
  • annular channel which is arranged between the high-pressure inlet and the bypass throttle, is preferably provided.
  • the annular channel can be formed either in the control module or in the nozzle housing of the injector. It is also possible that the annular channel is formed by recesses both in the control module and in the nozzle housing.
  • the guide device of the control module is designed as a cylindrical annular approach.
  • the control chamber is provided in the cylindrical projection and the valve body is guided in a central recess formed in the cylindrical projection.
  • connection region is provided either on the outer circumference of the guide device or on the inner circumference of the nozzle housing.
  • the connection area connects the high pressure inlet to the high pressure area on the valve body of the injector.
  • connection region is formed by a channel-like recess or by a plurality of recesses distributed on the circumference of the guide device and / or of the nozzle housing.
  • the connection area then results automatically during the assembly of the nozzle housing to the guide device by combining two recesses formed at the corresponding location.
  • the geometric shape of the connection region can be chosen arbitrarily, it is only to ensure that there is a sufficiently large cross section for a sufficient amount of fuel through the recesses.
  • a nozzle spring for returning the valve body is supported on the one hand on the guide device of the control module and on the other hand on a spring plate arranged on the valve body.
  • one or more centering surfaces are provided on the guide device to center the valve body. Thereby, a high movement accuracy of the valve body can be ensured.
  • the injection accuracy and the structure of the injector can be further improved in that preferably the control piston and the valve body are formed as a common component.
  • the valve body is designed as a nozzle needle.
  • the control module for an injector according to the invention is preferably used in storage injection systems such as e.g. Common rail injectors used for diesel engines. Since the control module according to the invention combines all elements for controlling and guiding the nozzle needle in one component, the injector can be made particularly compact and inexpensive. Furthermore, the functional test of this component is significantly simplified and the control module has only a minimum number of high-pressure sealing surfaces. The required high-pressure resistance of the injector can thereby be provided in a particularly cost-effective manner.
  • control module can be achieved by the control module according to the invention, resulting in significant advantages in terms of the switching dynamics of the injector and thereby also on the achievable minimum amounts of injected fuel.
  • control module 1 for an injector of a storage injection system is very compact.
  • the control module 1 includes a high pressure inlet 2 for supplying fuel from a high pressure pump to the injector. Furthermore, the control module 1 comprises a guide device 3 for guiding a valve body 8 of the injector, a control chamber 4, an inlet throttle 5 and an outlet throttle 6.
  • the inlet throttle 5 provides a connection between the high-pressure inlet 2 and the control chamber 4.
  • the outlet throttle 6 connects the control chamber 4 with a control valve 15.
  • the control valve 15 comprises a valve seat 16 and a valve ball 17 and is lifted from the valve seat 16 by means of an actuator (not shown) such as a piezo, a magnetostrictive actuator or a solenoid in a known manner, a connection of the control chamber 4 with a low pressure range ready.
  • an actuator such as a piezo, a magnetostrictive actuator or a solenoid in a known manner, a connection of the control chamber 4 with a low pressure range ready.
  • a bypass throttle 14 is provided in the control module 1, which connects the control valve 15 via an annular channel 13 with the high-pressure inlet 2 (see Figure 1).
  • the guide device 3 is formed as a cylindrical ring approach.
  • the needle guide 18 is formed and at the end of the recess of the control chamber 4 is arranged (see Figure 2).
  • connection regions 19 provide a connection between the high-pressure inlet 2, more precisely the annular channel 13, and a high-pressure region 9, which is located on the nozzle needle 8.
  • the connection regions 19 can be produced, for example, simply by grinding the cylindrical projection 3.
  • a nozzle spring 11 for returning the nozzle needle 8 is supported on the one hand on the guide device 3 and on the other hand on a spring plate 12, which is provided in a known manner on the nozzle needle 8 (see Figure 1).
  • the control valve 15 is actuated by means of an actuator, not shown, such that the valve ball 17 lifts off from its valve seat 16.
  • the nozzle needle 8 can lift off its seat and an injection of fuel takes place.
  • Figure 1 shows the open position of the injector, in which an injection of fuel takes place.
  • the fuel is thus supplied via the high pressure inlet 2 and the annular channel 13 through the connecting portion 19 of the guide device 3 to the high pressure region 9 on the nozzle needle 8.
  • the control valve 15 is closed again by means of the actuator, so that fuel is supplied on the one hand via the inlet throttle 5 and on the other hand via the bypass throttle 14 and the outlet throttle 6 in the control chamber 4.
  • the pressure in the control chamber 4 increases again, so that the control piston 7 is moved downward, so that the nozzle needle 8 closes the injection port again and the injection is completed.
  • the flow direction in the outlet throttle 6 reverses.
  • the nozzle spring 11 provides the closing force for the injector, since the pressure difference between the control chamber 4 and the high-pressure region 9 on the nozzle needle 8 is only relatively small.
  • a permanently leak-free injector can thus be provided, since the high-pressure sealing surfaces 21 and 22 (see FIG. 2) present on the control module 1 are designed only as planes which are relatively easy to seal.
  • a seal in the region of the control piston or the needle guide is no longer necessary, so that no leakage occurs in the non-actuated state of the injector.
  • all the elements for controlling and guiding the nozzle needle are arranged in one component, it is furthermore possible to provide a particularly cost-effective and compact injector become.
  • a minimal volume in the control chamber 4 can be achieved by the inventive design of the injector, resulting in an improved switching dynamics.
  • even very small amounts of fuel can be injected very accurately.
  • the present invention relates to a control module 1 for an injector of a storage injection system for controlling and guiding a valve body 8.
  • the control module comprises a high-pressure inlet 2 for supplying fuel and a guide device 3 for guiding the valve body 8.
  • a control chamber 4 an inlet throttle fifth and an outlet throttle 6 is provided.
  • the inlet throttle 5 connects the high-pressure inlet 2 to the control chamber 4 and the outlet throttle 6 connects the control chamber 4 with a control valve 15.
  • a control piston 7 is arranged, which at its the control chamber 4 opposite end with a high-pressure region 9 on the valve body 8 in connection stands.

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

Abstract

The invention relates to a control module (1) for an injector of an accumulator injection system, used to control and guide a valve body (8). Said control module comprises a high pressure supply line (2) for supplying fuel, and a guiding device (3) for guiding the valve body (8). A control room (4), an inlet throttle (5) and an outlet throttle (6) are also provided. The inlet throttle (5) connects the high pressure supply line (2) to the control chamber (4) and the outlet throttle (6) connects the control chamber (4) to a control valve (15). A control piston (7) is arranged in the control chamber (4), the end of said control piston opposite the control chamber (4) being connected to a high pressure region (9) on the valve body (8).

Description

Die vorliegende Erfindung betrifft ein Steuermodul für einen Injektor eines Speichereinspritzsystems zur Steuerung und Führung eines Injektorventilkörpers.The present invention relates to a control module for an injector of a storage injection system for controlling and guiding an injector valve body.

Injektoren für Speichereinspritzsysteme sind in unterschiedlichen Ausgestaltungen bekannt. Ein derartiger bekannter Injektor ist beispielsweise in Figur 4 dargestellt. Hierbei wird über eine Hochdruckzuleitung 30 Kraftstoff in den Umgebungsbereich der Düsennadel 36 zugeführt. Die Düsennadel 36 steht mit einem Steuerkolben 31 in Kontakt, welcher mit einem Ende in einem Steuerraum 32 angeordnet ist. Über ein Steuerventil 33 kann der Druck im Steuerraum 32 in bekannter Weise gesteuert werden, so dass der Steuerraum 32 mit einem Tank T verbindbar ist. Die dem Steuerraum 32 entgegengesetzte Seite des Steuerkolbens 31 ist mit einem Niederdruckraum 34 in Kontakt, welcher über einen Niederdruckablauf 35 mit dem Tank T verbunden ist. Dadurch kann die Düsennadel 36 in bekannter Weise von ihrem Sitz abheben und eine Einspritzung erfolgen.Injectors for storage injection systems are known in different configurations. Such a known injector is shown for example in Figure 4. In this case, fuel is supplied into the surrounding area of the nozzle needle via a high-pressure feed line 30. The nozzle needle 36 is in contact with a control piston 31, which is arranged with one end in a control chamber 32. Via a control valve 33, the pressure in the control chamber 32 can be controlled in a known manner, so that the control chamber 32 with a tank T is connectable. The control chamber 32 opposite side of the control piston 31 is in contact with a low-pressure space 34, which is connected via a low pressure drain 35 to the tank T. As a result, the nozzle needle 36 can be lifted in a known manner from its seat and an injection takes place.

Bei dem in Figur 4 gezeigten Injektorkonzept tritt jedoch in der Düsennadelführung 37 und in der Führung 38 des Steuerkolbens 31 eine Dauerleckage auf, da die mit Hochdruck beaufschlagten Räume über Dichtspalte mit dem Niederdruckraum 34 in Verbindung stehen. Somit strömt eine Kraftstoffmenge vom Hochdruckbereich über die beiden Führungen 37 und 38 zum Niederdruckraum 34. Diese Dauerleckage verursacht jedoch einen nicht zu vernachlässigenden Wirkungsgradverlust.In the injector concept shown in FIG. 4, however, permanent leakage occurs in the nozzle needle guide 37 and in the guide 38 of the control piston 31, since the spaces subjected to high pressure are in communication with the low-pressure space 34 via sealing gaps. Thus, an amount of fuel flows from the high pressure area via the two guides 37 and 38 to the low pressure space 34. However, this permanent leakage causes a not insignificant loss of efficiency.

Aus der EP 0 333 096 ist ein Steuermodul für ein Injektor eines Speichereinspritzsystems zur Steuerung und Führung eines Ventilkörpers bekannt, welches umfasst: Einen Hochdruckzulauf zum Zuführen von Kraftstoff, eine Führungsvorrichtung zur Führung des Ventilkörpers, einen einteiligen federlosen Steuerraum, einen im Steuerraum angeordneten Steuerkolben, welcher mittelbar mit den Ventilkörper in Verbindung steht und an seinem dem Steuerraum entgegengesetzten Ende mit einem Hochdruckbereich im Ventilkörper in Verbindung steht, eine Zulaufdrossel, welche eine Verbindung zwischen dem Hochdruckzulauf und Steuerraum bereitstellt, und eine Ablaufdrossel, welche sowohl in der geöffneten als auch in der geschlossenen Position des Injektors eine Verbindung zwischen dem Steuerraum und einem Steuerventil bereitstellt, wobei eine Düsenfeder zur Rückstellung des Ventilkörpers vorgesehen ist, die den Ventilkörper umschließt und im Hochdruckbereich angeordnet ist.From the EP 0 333 096 a control module for an injector of a storage injection system for controlling and guiding a valve body is known, which comprises: a high-pressure inlet for supplying fuel, a guide device for guiding the valve body, a one-piece springless control chamber, a control piston arranged in the control piston, which indirectly with the valve body is in communication and at its end opposite the control chamber with a high pressure area in the valve body is in communication, an inlet throttle, which provides a connection between the high-pressure inlet and control chamber, and an outlet throttle, which in both the open and in the closed Position of the injector provides a connection between the control chamber and a control valve, wherein a nozzle spring is provided for returning the valve body, which surrounds the valve body and is arranged in the high-pressure region.

Die EP 0 427 266 zeigt eine Hochdruckeinspritzeinheit umfassend ein Gehäuse mit einem Kraftstoffeinspritzzeitsteuerventil und einen hubregulierenden Solenoid-Aktuator, der ausgeführt ist, um die Menge des während eines Einspritzzyklus einzuspritzenden Kraftstoff mittels eines hubregulierenden Elements anzupassen, das vorgesehen ist, um einen Stoppabschnitt eines Einspritzventilkörpers zu ergreifen und ferner ausgeführt ist, wahlweise eine vorbestimmte Hubregulierungsposition einzunehmen in Antwort auf einen Hubregulierungssolonoidaktuator, der im Vorfeld des Einspritzzeitpunkts erregt wird.The EP 0 427 266 shows a high-pressure injection unit comprising a housing with a fuel injection timing valve and a stroke-regulating solenoid actuator, which is designed to adjust the amount of fuel to be injected during an injection cycle by means of a stroke-regulating element, which is intended to take a stop portion of an injection valve body and is further embodied optionally, assuming a predetermined stroke regulating position in response to a stroke regulating solenoid actuator energized in advance of the injection timing.

Es ist daher Aufgabe der vorliegenden Erfindung, bei einfachem Aufbau und einfacher, kostengünstiger Herstellbarkeit ein dauerleckagefreies Steuermodul bzw. einen dauerleckagefreien Injektor für Speichereinspritzsysteme bereitzustellen.It is therefore an object of the present invention, with a simple structure and simple, cost-effective manufacturability to provide a permanently leak-free control module or a permanently leak-free injector for storage injection systems.

Diese Aufgabe wird durch ein Steuermodul für einen Injektor mit den Merkmalen des Anspruchs 1 bzw. einen Injektor mit den Merkmalen des Anspruchs 11 gelöst. Bevorzugte Weiterbildungen sind Gegenstand der abhängigen Ansprüche.This object is achieved by a control module for an injector with the features of claim 1 and an injector with the features of claim 11. Preferred developments are the subject of the dependent claims.

Das erfindungsgemäße Steuermodul für einen Injektor ermöglicht einen dauerleckagefreien Injektor dadurch, dass alle Funktionselemente zur Steuerung und Führung des Ventilkörpers des Injektors in einem Bauteil integriert sind. Dadurch wird eine minimale Anzahl von Hochdruckdichtflächen erreicht. Die Hochdruckdichtflächen sind dabei nur als Ebenen ausgebildet, so dass keine zylinderförmigen Führungsflächen, welche als Hochdruck-Abdichtflächen im Stand der Technik notwendig sind, vorhanden sind. Dadurch kann ein Injektor ohne die im Stand der Technik vorhandene Dauerleckage bereitgestellt werden. Im erfindungsgemäßen Steuermodul sind dabei ein Hochdruckzulauf, eine Führungsvorrichtung zur Führung des Ventilkörpers des Injektors, ein Steuerraum, eine Zulaufdrossel und eine Ablaufdrossel angeordnet. Im Steuerraum ist ein Steuerkolben angeordnet, welcher mittelbar oder unmittelbar mit dem Ventilkörper in Verbindung steht. Der Steuerkolben steht dabei mit seinem dem Steuerraum entgegengesetzten Ende mit einem Hochdruckbereich am Ventilkörper in Verbindung. Das erfindungsgemäße Steuermodul kann somit auch sehr kompakt aufgebaut werden, so dass die Gesamtabmessungen des Injektors im Vergleich mit dem Stand der Technik weiter verringert werden können. Weiterhin kann durch das erfindungsgemäße Steuermodul insbesondere auch auf die im Stand der Technik vorhandene lange Hochdruckleitung verzichtet werden, welche üblicherweise durch den gesamten Injektorkörper geführt ist und neben ihrer aufwendigen Herstellung auch zu Festigkeitsproblemen führen kann.The control module according to the invention for an injector allows a permanently leak-free injector in that all functional elements for controlling and guiding the valve body of the injector are integrated in one component. As a result, a minimum number of high-pressure sealing surfaces is achieved. The high-pressure sealing surfaces are formed only as planes, so that no cylindrical guide surfaces, which are necessary as high-pressure sealing surfaces in the prior art, are available. Thereby, an injector can be provided without the existing in the prior art permanent leakage. In the control module according to the invention, a high pressure inlet, a guide device for guiding the valve body of the injector, a control chamber, an inlet throttle and an outlet throttle are arranged. In the control chamber, a control piston is arranged, which is directly or indirectly connected to the valve body in connection. The control piston stands with its end opposite the control chamber with a high pressure area on the valve body in connection. The control module according to the invention can thus be constructed very compact, so that the overall dimensions of the injector can be further reduced in comparison with the prior art. Furthermore, can be dispensed with by the control module according to the invention in particular on the existing in the prior art long high-pressure line, which is usually performed by the entire injector and can lead to strength problems in addition to their complex production.

Vorzugsweise umfasst das erfindungsgemäße Steuermodul weiter eine Bypassdrossel, welche eine Verbindung zwischen dem Hochdruckzulauf und dem Steuerventil des Injektors bereitstellt.Preferably, the control module according to the invention further comprises a bypass throttle, which provides a connection between the high-pressure inlet and the control valve of the injector.

Mit der Bypassdrossel kann insbesondere eine verkürzte Schließzeit des Injektors ermöglicht werden.In particular, a shortened closing time of the injector can be made possible with the bypass throttle.

Um eine besonders kostengünstige Herstellbarkeit des Injektors zu ermöglichen, ist vorzugsweise ein Ringkanal, welcher zwischen dem Hochdruckzulauf und der Bypassdrossel angeordnet ist, vorgesehen. Dabei kann der Ringkanal entweder im Steuermodul oder im Düsengehäuse des Injektors ausgebildet sein. Es ist auch möglich, dass der Ringkanal durch Ausnehmungen sowohl im Steuermodul als auch im Düsengehäuse gebildet ist.In order to enable a particularly cost-effective manufacturability of the injector, an annular channel, which is arranged between the high-pressure inlet and the bypass throttle, is preferably provided. In this case, the annular channel can be formed either in the control module or in the nozzle housing of the injector. It is also possible that the annular channel is formed by recesses both in the control module and in the nozzle housing.

Gemäß einer bevorzugten Ausgestaltung der vorliegenden Erfindung ist die Führungsvorrichtung des Steuermoduls als zylinderringförmiger Ansatz ausgebildet. Besonders bevorzugt ist dabei der Steuerraum im zylinderförmigen Ansatz vorgesehen und der Ventilkörper ist in einer im zylinderförmigen Ansatz gebildeten mittleren Ausnehmung geführt.According to a preferred embodiment of the present invention, the guide device of the control module is designed as a cylindrical annular approach. Particularly preferably, the control chamber is provided in the cylindrical projection and the valve body is guided in a central recess formed in the cylindrical projection.

Um einen besonders kompakten Aufbau des erfindungsgemäßen Steuermoduls bereitzustellen, ist entweder am Außenumfang der Führungsvorrichtung oder am Innenumfang des Düsengehäuses ein Verbindungsbereich vorgesehen. Der Verbindungsbereich verbindet den Hochdruckzulauf mit dem Hochdruckbereich am Ventilkörper des Injektors. Somit kann der erfindungsgemäße Verbindungsbereich einfach hergestellt werden.In order to provide a particularly compact design of the control module according to the invention, a connection region is provided either on the outer circumference of the guide device or on the inner circumference of the nozzle housing. The connection area connects the high pressure inlet to the high pressure area on the valve body of the injector. Thus, the connection region of the invention can be easily manufactured.

Besonders bevorzugt ist der Verbindungsbereich durch eine kanalartige Ausnehmung oder durch mehrere, am Umfang der Führungsvorrichtung und/oder des Düsengehäuses verteilte Ausnehmungen gebildet. Der Verbindungsbereich ergibt sich dabei dann automatisch bei der Montage des Düsengehäuses an die Führungsvorrichtung durch Kombination zweier an entsprechender Stelle gebildeten Ausnehmungen. Die geometrische Form des Verbindungsbereichs kann dabei beliebig gewählt werden, es ist nur sicherzustellen, dass durch die Ausnehmungen ein ausreichend großer Querschnitt für eine ausreichende Menge von Kraftstoff vorhanden ist.Particularly preferably, the connection region is formed by a channel-like recess or by a plurality of recesses distributed on the circumference of the guide device and / or of the nozzle housing. The connection area then results automatically during the assembly of the nozzle housing to the guide device by combining two recesses formed at the corresponding location. The geometric shape of the connection region can be chosen arbitrarily, it is only to ensure that there is a sufficiently large cross section for a sufficient amount of fuel through the recesses.

Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung stützt sich eine Düsenfeder zur Rückstellung des Ventilkörpers einerseits an der Führungsvorrichtung des Steuermoduls und andererseits an einem am Ventilkörper angeordneten Federteller ab.According to a further preferred embodiment of the present invention, a nozzle spring for returning the valve body is supported on the one hand on the guide device of the control module and on the other hand on a spring plate arranged on the valve body.

Um die Genauigkeit des Injektors während des Einspritzens von Kraftstoff weiter zu verbessern, sind an der Führungsvorrichtung eine oder mehrere Zentrierflächen vorgesehen, um den Ventilkörper zu zentrieren. Dadurch kann eine hohe Bewegungsgenauigkeit des Ventilkörpers sichergestellt werden.In order to further improve the accuracy of the injector during the injection of fuel, one or more centering surfaces are provided on the guide device to center the valve body. Thereby, a high movement accuracy of the valve body can be ensured.

Die Einspritzgenauigkeit und der Aufbau des Injektors kann weiter dadurch verbessert werden, dass vorzugsweise der Steuerkolben und der Ventilkörper als ein gemeinsames Bauteil ausgebildet sind. Besonders bevorzugt ist der Ventilkörper dabei als Düsennadel ausgebildet.The injection accuracy and the structure of the injector can be further improved in that preferably the control piston and the valve body are formed as a common component. Particularly preferably, the valve body is designed as a nozzle needle.

Das erfindungsgemäße Steuermodul für einen Injektor wird vorzugsweise bei Speichereinspritzsystemen wie z.B. Common-Rail-Injektoren für Dieselmotoren verwendet. Da das erfindungsgemäße Steuermodul alle Elemente zur Steuerung und Führung der Düsennadel in einem Bauteil vereinigt, kann der Injektor besonders kompakt und kostengünstig hergestellt werden. Weiterhin wird die Funktionsprüfung dieses Bauteils deutlich vereinfacht und das Steuermodul weist nur eine minimale Anzahl von Hochdruckdichtflächen auf. Die erforderliche Hochdruckfestigkeit des Injektors kann dadurch auf besonders kostengünstige Weise bereitgestellt werden.The control module for an injector according to the invention is preferably used in storage injection systems such as e.g. Common rail injectors used for diesel engines. Since the control module according to the invention combines all elements for controlling and guiding the nozzle needle in one component, the injector can be made particularly compact and inexpensive. Furthermore, the functional test of this component is significantly simplified and the control module has only a minimum number of high-pressure sealing surfaces. The required high-pressure resistance of the injector can thereby be provided in a particularly cost-effective manner.

Weiterhin kann durch das erfindungsgemäße Steuermodul ein minimales Volumen des Steuerraums erreicht werden, woraus sich wesentliche Vorteile im Hinblick auf die Schaltdynamik des Injektors und dadurch auch auf die erzielbaren Kleinstmengen von eingespritztem Kraftstoff ergeben.Furthermore, a minimal volume of the control chamber can be achieved by the control module according to the invention, resulting in significant advantages in terms of the switching dynamics of the injector and thereby also on the achievable minimum amounts of injected fuel.

Nachfolgend wird die Erfindung anhand eines bevorzugten Ausführungsbeispiels in Verbindung mit der Zeichnung beschrieben. In der Zeichnung ist:

Figur 1
eine schematische Schnittdarstellung eines Injektors mit einem Steuermodul gemäß einem Ausführungsbeispiel der vorliegenden Erfindung;
Figur 2
eine vergrößerte schematische Schnittansicht des in Figur 1 gezeigten Steuermoduls;
Figur 3
eine Schnittdarstellung entlang der Linie A-A von Figur 2; und
Figur 4
ein Injektor für ein Speichereinspritzsystem gemäß dem Stand der Technik.
The invention will be described with reference to a preferred embodiment in conjunction with the drawings. In the drawing is:
FIG. 1
a schematic sectional view of an injector with a control module according to an embodiment of the present invention;
FIG. 2
an enlarged schematic sectional view of the control module shown in Figure 1;
FIG. 3
a sectional view taken along the line AA of Figure 2; and
FIG. 4
an injector for a storage injection system according to the prior art.

Nachfolgend wird unter Bezugnahme auf die Fig. 1 bis 3 ein Ausführungsbeispiel gemäß der vorliegenden Erfindung beschrieben.Hereinafter, an embodiment according to the present invention will be described with reference to Figs.

Wie insbesondere in Figur 1 gezeigt, ist das erfindungsgemäße Steuermodul 1 für einen Injektor eines Speichereinspritzsystems sehr kompakt aufgebaut. Das Steuermodul 1 umfasst einen Hochdruckzulauf 2, um Kraftstoff von einer Hochdruckpumpe zum Injektor zuzuführen. Weiter umfasst das Steuermodul 1 eine Führungsvorrichtung 3 zur Führung eines Ventilkörpers 8 des Injektors, einen Steuerraum 4, eine Zulaufdrossel 5 und eine Ablaufdrossel 6. Die Zulaufdrossel 5 stellt eine Verbindung zwischen dem Hochdruckzulauf 2 und dem Steuerraum 4 bereit. Die Ablaufdrossel 6 verbindet den Steuerraum 4 mit einem Steuerventil 15. Das Steuerventil 15 umfasst einen Ventilsitz 16 sowie eine Ventilkugel 17 und wird mittels eines Aktors (nicht gezeigt), wie beispielsweise eines Piezos, eines magnetostriktiven Aktors oder eines Solenoids vom Ventilsitz 16 abgehoben und stellt in bekannter Weise eine Verbindung des Steuerraums 4 mit einem Niedrigdruckbereich bereit. Weiterhin ist eine Bypassdrossel 14 im Steuermodul 1 vorgesehen, welche das Steuerventil 15 über einen Ringkanal 13 mit dem Hochdruckzulauf 2 verbindet (vgl. Figur 1).As shown in particular in Figure 1, the control module 1 according to the invention for an injector of a storage injection system is very compact. The control module 1 includes a high pressure inlet 2 for supplying fuel from a high pressure pump to the injector. Furthermore, the control module 1 comprises a guide device 3 for guiding a valve body 8 of the injector, a control chamber 4, an inlet throttle 5 and an outlet throttle 6. The inlet throttle 5 provides a connection between the high-pressure inlet 2 and the control chamber 4. The outlet throttle 6 connects the control chamber 4 with a control valve 15. The control valve 15 comprises a valve seat 16 and a valve ball 17 and is lifted from the valve seat 16 by means of an actuator (not shown) such as a piezo, a magnetostrictive actuator or a solenoid in a known manner, a connection of the control chamber 4 with a low pressure range ready. Farther is a bypass throttle 14 is provided in the control module 1, which connects the control valve 15 via an annular channel 13 with the high-pressure inlet 2 (see Figure 1).

Wie insbesondere aus den Figuren 2 und 3 ersichtlich ist, ist die Führungsvorrichtung 3 als zylinderringförmige Ansatz ausgebildet. In der inneren, zentralen Ausnehmung der Führungsvorrichtung 3 ist die Nadelführung 18 ausgebildet und am Ende der Ausnehmung ist der Steuerraum 4 angeordnet (vgl. Figur 2).As can be seen in particular from Figures 2 and 3, the guide device 3 is formed as a cylindrical ring approach. In the inner, central recess of the guide device 3, the needle guide 18 is formed and at the end of the recess of the control chamber 4 is arranged (see Figure 2).

Wie in Figur 1 gezeigt, ist der Steuerkolben 7 einstückig mit der Düsennadel 8 ausgebildet, so dass die Führung 18 des Steuerkolbens 7 gleichzeitig auch die Führung für die Nadel ist. Wie in Figur 3 gezeigt, sind am Außenumfang der Führungsvorrichtung 3 vier Verbindungsbereiche 19 sowie vier Zentrierflächen 20 ausgebildet. Die Verbindungsbereiche 19 stellen eine Verbindung zwischen dem Hochdruckzulauf 2, genauer dem Ringkanal 13, und einem Hochdruckbereich 9 bereit, welcher sich an der Düsennadel 8 befindet. Die Verbindungsbereiche 19 können beispielsweise einfach mittels Anschleifen des zylindrischen Ansatzes 3 hergestellt werden.As shown in Figure 1, the control piston 7 is formed integrally with the nozzle needle 8, so that the guide 18 of the control piston 7 is also the guide for the needle. As shown in FIG. 3, four connecting regions 19 and four centering surfaces 20 are formed on the outer circumference of the guide device 3. The connection regions 19 provide a connection between the high-pressure inlet 2, more precisely the annular channel 13, and a high-pressure region 9, which is located on the nozzle needle 8. The connection regions 19 can be produced, for example, simply by grinding the cylindrical projection 3.

Eine Düsenfeder 11 zur Rückstellung der Düsennadel 8 stützt sich einerseits an der Führungsvorrichtung 3 ab und andererseits an einem Federteller 12, welcher in bekannter Weise an der Düsennadel 8 vorgesehen ist (vgl. Figur 1).A nozzle spring 11 for returning the nozzle needle 8 is supported on the one hand on the guide device 3 and on the other hand on a spring plate 12, which is provided in a known manner on the nozzle needle 8 (see Figure 1).

Nachfolgend wird die Funktionsweise des Injektors mit dem erfindungsgemäßen Steuermodul 1 beschrieben. Wenn eine Einspritzung von Kraftstoff erfolgen soll, wird das Steuerventil 15 mittels eines nicht dargestellten Aktors derart betätigt, dass sich die Ventilkugel 17 von ihrem Ventilsitz 16 abhebt. Dadurch entsteht über die Ablaufdrossel 6 eine Verbindung zwischen dem Steuerraum 4 und einem Niederdruckbereich des Injektors, so dass der Druck im Steuerraum 4 sinkt. Dadurch kann sich der Steuerkolben 7 in den Steuerraum 4 in die in Figur 1 dargestellte Position bewegen. Somit kann sich die Düsennadel 8 von ihrem Sitz abheben und eine Einspritzung von Kraftstoff erfolgt. Figur 1 zeigt die geöffnete Stellung des Injektors, in welcher eine Einspritzung von Kraftstoff erfolgt.The operation of the injector with the control module 1 according to the invention will be described below. If an injection of fuel is to take place, the control valve 15 is actuated by means of an actuator, not shown, such that the valve ball 17 lifts off from its valve seat 16. This creates a connection between the control chamber 4 and a low pressure region of the injector via the outlet throttle 6, so that the pressure in the control chamber 4 decreases. This allows the control piston 7 in the control chamber 4 in the in Figure 1 shown position move. Thus, the nozzle needle 8 can lift off its seat and an injection of fuel takes place. Figure 1 shows the open position of the injector, in which an injection of fuel takes place.

Der Kraftstoff wird somit über den Hochdruckzulauf 2 und den Ringkanal 13 durch den Verbindungsbereich 19 der Führungsvorrichtung 3 zum Hochdruckbereich 9 an der Düsennadel 8 zugeführt.The fuel is thus supplied via the high pressure inlet 2 and the annular channel 13 through the connecting portion 19 of the guide device 3 to the high pressure region 9 on the nozzle needle 8.

Wenn die Einspritzung beendet werden soll, wird das Steuerventil 15 mittels des Aktors wieder geschlossen, so dass Kraftstoff einerseits über die Zulaufdrossel 5 und andererseits über die Bypassdrossel 14 und die Ablaufdrossel 6 in den Steuerraum 4 zugeführt wird. Dadurch steigt der Druck im Steuerraum 4 wieder an, so dass der Steuerkolben 7 nach unten bewegt wird, so dass die Düsennadel 8 die Einspritzöffnung wieder verschließt und die Einspritzung abgeschlossen ist. Es sei angemerkt, dass während des Befüllens des Steuerraumes 4 mit Kraftstoff sich die Strömungsrichtung in der Ablaufdrossel 6 umkehrt. Die Düsenfeder 11 stellt dabei die Schließkraft für den Injektor bereit, da die Druckdifferenz zwischen dem Steuerraum 4 und dem Hochdruckbereich 9 an der Düsennadel 8 nur relativ klein ist.When the injection is to be ended, the control valve 15 is closed again by means of the actuator, so that fuel is supplied on the one hand via the inlet throttle 5 and on the other hand via the bypass throttle 14 and the outlet throttle 6 in the control chamber 4. As a result, the pressure in the control chamber 4 increases again, so that the control piston 7 is moved downward, so that the nozzle needle 8 closes the injection port again and the injection is completed. It should be noted that during the filling of the control chamber 4 with fuel, the flow direction in the outlet throttle 6 reverses. The nozzle spring 11 provides the closing force for the injector, since the pressure difference between the control chamber 4 and the high-pressure region 9 on the nozzle needle 8 is only relatively small.

Durch die erfindungsgemäße Ausbildung des Steuermoduls 1 kann somit ein dauerleckagefreier Injektor bereitgestellt werden, da die am Steuermodul 1 vorhandenen Hochdruckdichtflächen 21 und 22 (vgl. Figur 2) nur als Ebenen ausgebildet sind, welche relativ einfach abdichtbar sind. Somit ist erfindungsgemäß eine Abdichtung im Bereich des Steuerkolbens bzw. der Nadelführung nicht mehr notwendig, so dass keine Leckage im nichtbetätigten Zustand des Injektors auftritt. Da erfindungsgemäß alle Elemente zur Steuerung und Führung der Düsennadel in einem Bauteil angeordnet sind, kann weiterhin auch ein besonders kostengünstig herstellbarer und kompakter Injektor bereitgestellt werden. Darüberhinaus kann durch die erfindungsgemäße Ausbildung des Injektors ein minimales Volumen im Steuerraum 4 erreicht werden, was zu einer verbesserten Schaltdynamik führt. Weiterhin können dadurch auch Kleinstmengen von Kraftstoff sehr genau eingespritzt werden. Somit kann mit der vorliegenden Erfindung zum ersten Mal ein dauerleckagefreier Injektor bereitgestellt werden, wodurch sich der Wirkungsgrad des Injektors im Vergleich mit dem Stand der Technik deutlich verbessert.As a result of the design of the control module 1 according to the invention, a permanently leak-free injector can thus be provided, since the high-pressure sealing surfaces 21 and 22 (see FIG. 2) present on the control module 1 are designed only as planes which are relatively easy to seal. Thus, according to the invention a seal in the region of the control piston or the needle guide is no longer necessary, so that no leakage occurs in the non-actuated state of the injector. Since, according to the invention, all the elements for controlling and guiding the nozzle needle are arranged in one component, it is furthermore possible to provide a particularly cost-effective and compact injector become. In addition, a minimal volume in the control chamber 4 can be achieved by the inventive design of the injector, resulting in an improved switching dynamics. Furthermore, even very small amounts of fuel can be injected very accurately. Thus, with the present invention for the first time a permanently leak-free injector can be provided, whereby the efficiency of the injector in comparison with the prior art significantly improved.

Somit betrifft die vorliegenden Erfindung ein Steuermodul 1 für einen Injektor eines Speichereinspritzsystems zur Steuerung und Führung eines Ventilkörpers 8. Das Steuermodul umfasst einen Hochdruckzulauf 2 zum Zuführen von Kraftstoff und eine Führungsvorrichtung 3 zur Führung des Ventilkörpers 8. Weiter ist ein Steuerraum 4, eine Zulaufdrossel 5 und eine Ablaufdrossel 6 vorgesehen. Die Zulaufdrossel 5 verbindet den Hochdruckzulauf 2 mit dem Steuerraum 4 und die Ablaufdrossel 6 verbindet den Steuerraum 4 mit einem Steuerventil 15. Im Steuerraum 4 ist ein Steuerkolben 7 angeordnet, welcher an seinem dem Steuerraum 4 entgegengesetzten Ende mit einem Hochdruckbereich 9 am Ventilkörper 8 in Verbindung steht.Thus, the present invention relates to a control module 1 for an injector of a storage injection system for controlling and guiding a valve body 8. The control module comprises a high-pressure inlet 2 for supplying fuel and a guide device 3 for guiding the valve body 8. Further, a control chamber 4, an inlet throttle fifth and an outlet throttle 6 is provided. The inlet throttle 5 connects the high-pressure inlet 2 to the control chamber 4 and the outlet throttle 6 connects the control chamber 4 with a control valve 15. In the control chamber 4, a control piston 7 is arranged, which at its the control chamber 4 opposite end with a high-pressure region 9 on the valve body 8 in connection stands.

Die vorhergehende Beschreibung des Ausführungsbeispiels gemäß der vorliegenden Erfindung dient nur zu illustrativen Zwecken und nicht zum Zwecke der Beschränkung der Erfindung. Im Rahmen der Erfindung sind verschiedene Änderungen und Modifikationen möglich, ohne den Umfang der Erfindung sowie ihrer Äquivalente zu verlassen.The foregoing description of the embodiment according to the present invention is for illustrative purposes only and not for the purpose of limiting the invention. Various changes and modifications are possible within the scope of the invention without departing from the scope of the invention and its equivalents.

Claims (11)

  1. Control module (1) for an injector of an accumulator injection system for the control and guidance of a valve body (8), comprising
    - a high-pressure inflow (2) for the delivery of fuel;
    - a guide device (3) for guiding the valve body (8);
    - a springless control space (4) designed as a cylindrical bore of constant diameter;
    - a control piston (7) which is arranged in the control space (4) and which is connected indirectly or directly to the valve body (8) and is connected at its end opposite the control space (4) to a high-pressure region (9) on the valve body (8);
    - an inflow throttle (5) which makes a connection between the high-pressure inflow (2) and the control space (4); and
    - an outflow throttle (6) which makes a connection between the control space (4) and a control valve (15) both in the open position and the closed position of the injector;
    - a nozzle spring (11) for the return of the valve body (8) being provided, which surrounds the valve body (8) and is arranged in the high-pressure region (9)
    characterized in that the guide device (3) is designed as an extension in the form of a cylindrical ring, with an inner central recess in which a needle guide (18) is formed, and the control space (4) is arranged at the end of the recess (18).
  2. Control module according to Claim 1, characterized by a bypass throttle (14) which makes a connection between the high-pressure inflow (2) and the control valve (15).
  3. Control module according to Claim 2, characterized by an annular duct (13) which is arranged between the high-pressure inflow (2) and the bypass throttle (14).
  4. Control module according to Claim 3, characterized in that the annular duct (13) is formed in the control module (1) and/or in a nozzle housing (10).
  5. Control module according to Claims 1 to 4, characterized in that a connection region (19), which connects the high-pressure inflow (2) to the high-pressure region (9) on the valve body (8), is provided on the outer circumference of the guide device (3) or on the inner circumference of the nozzle housing (10).
  6. Control module according to Claim 5, characterized in that the connection region (19) is formed by a duct-like recess or by a plurality of recesses distributed on the outer circumference of the guide device (3) and/or on the inner circumference of the nozzle housing (10).
  7. Control module according to one of Claims 1 to 6, characterized in that a nozzle spring (11) for the return of the valve body (8) is supported, on the one hand, on the guide device (3) and, on the other hand, on a spring plate (12) arranged on the valve body (8).
  8. Control module according to one of Claims 1 to 7, characterized in that centering surfaces (20) for centering the valve body (8) are provided on the guide device (3).
  9. Control module according to one of Claims 1 to 8, characterized in that the control piston (4) and the valve body (8) are designed as a common one-piece component.
  10. Control module according to one of Claims 1 to 9, characterized in that the valve body (8) is designed as a nozzle needle.
  11. Injector for an accumulator injection system having a control module (1) according to one of Claims 1 to 10.
EP02754296A 2001-07-02 2002-07-01 Control module for an injector of an accumulator injection system Revoked EP1402170B8 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10131953A DE10131953A1 (en) 2001-07-02 2001-07-02 Control module for an injector of a storage injection system
DE10131953 2001-07-02
PCT/DE2002/002383 WO2003004862A1 (en) 2001-07-02 2002-07-01 Control module for an injector of an accumulator injection system

Publications (3)

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EP1402170A1 EP1402170A1 (en) 2004-03-31
EP1402170B1 true EP1402170B1 (en) 2008-01-16
EP1402170B8 EP1402170B8 (en) 2008-03-19

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EP (1) EP1402170B8 (en)
JP (1) JP4200096B2 (en)
DE (2) DE10131953A1 (en)
WO (1) WO2003004862A1 (en)

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EP1402170B8 (en) 2008-03-19
US6986474B2 (en) 2006-01-17
DE10131953A1 (en) 2003-01-23
EP1402170A1 (en) 2004-03-31
WO2003004862A1 (en) 2003-01-16
JP4200096B2 (en) 2008-12-24
DE50211560D1 (en) 2008-03-06
JP2004532956A (en) 2004-10-28
US20040169094A1 (en) 2004-09-02

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