EP3027882B1 - Fuel distributor and fuel injection system - Google Patents

Fuel distributor and fuel injection system Download PDF

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Publication number
EP3027882B1
EP3027882B1 EP14734757.9A EP14734757A EP3027882B1 EP 3027882 B1 EP3027882 B1 EP 3027882B1 EP 14734757 A EP14734757 A EP 14734757A EP 3027882 B1 EP3027882 B1 EP 3027882B1
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EP
European Patent Office
Prior art keywords
fuel
sensor
distributor
main body
fuel injection
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EP14734757.9A
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German (de)
French (fr)
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EP3027882A1 (en
Inventor
Martin RIEGEL
Jan Kafka
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Robert Bosch GmbH
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Robert Bosch GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors

Definitions

  • the invention relates to a fuel distributor, which serves to distribute fuel to a plurality of fuel injection valves, and a fuel injection system having such a fuel distributor and a plurality of fuel injection valves.
  • the invention relates to the field of fuel injection systems that are used for injection, in particular for port injection, of natural gas in internal combustion engines.
  • the known injector assembly includes a fuel rail, an anvil, and injectors.
  • the fuel rail is used to distribute compressed natural gas to the injectors.
  • a sensor is mounted to the fuel rail, which serves for example for measuring the pressure and the temperature of the natural gas in the fuel rail.
  • the from the DE 10 2010 064 115 A1 known injector arrangement has the disadvantage that the production of the fuel rail, which is formed of aluminum or a stainless steel, especially for larger production volume is uneconomical to manufacture. Further, a sensor and a connection element must be mounted on the fuel rail to connect the sensor on the one hand with the fuel rail and on the other hand with a control device. This requires additional work steps in the production. In addition, the sealing point between the sensor and the fuel rail must be reliably formed, over the life of which there is a risk that the sealing point will leak.
  • the fuel distributor according to the invention with the features of claim 1 and the fuel injection system according to the invention with the features of claim 8 have the advantage that an improved design is possible.
  • economical production of the fuel distributor and of the fuel injection system is possible, at the same time enabling simple production or assembly as well as improved sealing in the region of the sensor.
  • the measures listed in the dependent claims advantageous developments of the fuel distributor specified in claim 1 are possible.
  • the fuel injectors are not part of the fuel distributor.
  • the fuel distributor can also be manufactured and distributed independently of the fuel injection valves.
  • the fuel distributor and the sensor are separate components, which are connected to one another, for example, during a pre-assembly.
  • the sensor and the sensor connection can also be realized by separate components.
  • the senor is part of the fuel distributor. Furthermore, the sensor connection of the sensor is also part of the fuel distributor. Because the sensor connection of the sensor is integrated in the body of the fuel distributor. Depending on the configuration, the entire sensor may be located in the base body. However, the sensor can also protrude at least partially into the fuel space of the main body. Then at least the sensor connection of the sensor is integrated into the main body. It is advantageous that the main body has a manifold which is formed of a plastic. The fuel space is then preferably configured within the manifold. Thus, the fuel can be routed through the manifold and split among the various fuel injectors. If necessary, the fuel space can also serve as a fuel storage. Specifically, the fuel can be introduced as compressed natural gas in the fuel space. While the compressed natural gas is then introduced into the fuel space, the fuel space in the manifold due to its storage function can ensure that the short-term removal of natural gas, the required pressure is ensured.
  • the fuel distributor thus serves advantageously for distributing natural gas to the fuel injection valves.
  • the internal combustion engine can be designed in particular as a diesel or gasoline engine.
  • the natural gas is stored here preferably as compressed natural gas in a gas storage, for example at pressures of about 20 MPa (200 bar). Such a compressed natural gas is also called CNG.
  • CNG compressed natural gas
  • the concept of natural gas is not limited to natural gas but is generally understood.
  • the natural gas can also be obtained artificially by coal gasification. Therefore, the term natural gas and natural gas-like fuels to understand.
  • the main body can thus be at least partially formed of a plastic.
  • the base body may also be formed at least partially from a plastic extrusion.
  • the integration of the sensor in the body can be done by the plastic extrusion.
  • the sensor can be designed as a functional module, which is thereby advantageously integrated into the fuel distributor.
  • the outputs via which the fuel from the fuel chamber to the fuel valves can be performed, are integrated into the main body.
  • the outputs may be formed by cups, to which the fuel injection valves can be fastened, the cups being integrated into the basic body.
  • inlet ports of the fuel injectors can then be inserted into the cups.
  • the fastening of the fuel injection valves can take place, for example, via fastening means configured as clamps.
  • Such fastening means are preferably attached to the cups, wherein the fastening means then fix the inlet nozzle of the respective fuel injection valve to the cup.
  • the fuel injection system can be made of a small number of components and assembled in a simple manner.
  • the cups may be advantageously formed from a plastic.
  • the cups can also be integrated in an advantageous manner in the body.
  • the base body can be advantageously stabilized by a plurality of stiffening ribs.
  • the use of materials can be reduced and the production costs are reduced.
  • the sensor can be configured advantageously both as a pressure sensor and as a temperature sensor.
  • a further sensor is provided with a sensor connection, wherein at least the sensor connection of the further sensor is integrated into the base body.
  • more than two sensors are more than two sensors, if this makes sense in the respective application.
  • only one sensor connection is provided, as this reduces the space required and the assembly is simplified.
  • Fig. 1 shows a fuel injection system 1 with a fuel distributor 2 and a plurality of fuel injection valves 3, 4 in a three-dimensional representation according to an embodiment of the invention.
  • the fuel distributor 2 is particularly suitable for distributing natural gas, in particular CNG, to the fuel injection valves 3, 4.
  • the fuel distributor 2 can also be used to distribute other fuels.
  • the fuel injection system 1 is particularly suitable for the intake manifold injection of natural gas in internal combustion engines.
  • the fuel injection system 1 of the invention is also suitable for other applications.
  • the fuel distributor 2 has a main body 5 with a distributor pipe 6. Furthermore, a sensor 7 with a sensor connection 8 is provided. At least the sensor connection 8 of the sensor 7 is integrated in the main body 5. As a result, the sensor connection 8 is connected to the distributor tube 6. In this case, the sensor connection 8 is preferably configured in one piece with the distributor tube 6.
  • the main body can be formed for this purpose in particular from a plastic. In the embodiment of the main body 5, however, different plastics can be used.
  • the main body 5 with the distributor tube 6 and the sensor connection 8 can be formed at least partially from a plastic extrusion coating. As a result, the sensor connection 8 can be integrated into the main body 5 by the plastic extrusion coating.
  • the interior space 9 serves as a fuel space 9.
  • a fuel line can be connected to a connection 10 of the main body 5 in order to introduce compressed natural gas or other fuels into the fuel space 9.
  • the fuel distributor 2 also has outputs 11, 12.
  • the outputs 11, 12 are formed by cups 11, 12, to which the fuel injection valves 3, 4 are attached.
  • inlet stubs 13, 14 of the fuel injection valves 3, 4 are inserted into the cups 11, 12 at least in sections.
  • fasteners 15, 16 configured as brackets 15, 16, the respective fuel injection valve 3, 4 is then connected to the cup 11, 12 at its inlet connection 13, 14.
  • the fuel injection valves 3, 4 are then fixed to the cups 11, 12 of the fuel distributor 2.
  • the cups 11, 12 are formed of a plastic.
  • the cups 11, 12 are integrated into the main body 5.
  • the cups 11, 12 may be formed together with the manifold 6 of a molded plastic.
  • the outputs 11, 12 can be integrated into the main body 5 in an advantageous manner.
  • the outputs 11, 12 can also be designed modified.
  • fuel in particular natural gas
  • the sensor 7 is preferably designed as a pressure and temperature sensor 7.
  • a signal and / or power line can be connected to the sensor connection 8 in order to transmit at least one measurement signal and if necessary to supply the sensor 7 with energy.
  • the manifold 6 extends along a longitudinal axis 20.
  • the main body 5 in this embodiment on the manifold 6 a plurality of stiffening ribs 21, 22, 23.
  • stiffening ribs 21, 22, 23 are marked here.
  • a part of the stiffening ribs 21, 22 extends in a circumferential direction with respect to the longitudinal axis 20.
  • Another part of the stiffening ribs 23 extends parallel to the longitudinal axis 20.
  • the fuel distributor 2 and the fuel injection system 1 can be made in a compact construction.
  • the required work steps can be reduced.
  • a cost reduction is possible.
  • the risk of leaking sealing points between the manifold 6 and the sensor port 8 and the manifold 6 and the cups 11, 12 avoided from the outset, since such sealing points due to the integration of the sensor terminal 8 in the main body 5 and the cups 11, 12 in the Base 5 omitted.
  • the fuel injection system 1 may also have more than two fuel injection valves 3, 4.
  • the number of outputs 11, 12, in particular cups 11, 12, can be adapted to the particular application.
  • an extension of the distributor tube 6 along the longitudinal axis 20 can be predetermined accordingly.
  • a suitable embodiment of the fuel distributor 2 and of the fuel injection system 1 can be selected.
  • the fuel injection system 1 and the fuel distributor 2 have the advantage that a compact design is made possible. Because of the integration of the sensor terminal 8 in the main body 5 related separate connectors are saved, with a space-saving design is possible. Accordingly, the space requirement in the area of the outlets 11, 12 or the cups 11, 12 of the distributor tube 6 can be reduced. In particular, mechanical connection points between the cups 11, 12 and the distributor tube 6, in particular screw thread, can be omitted here. This also approaches or the like can be omitted, which are otherwise required for the mechanical stability of such screw thread or other mechanical connection points.

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

Description

Stand der TechnikState of the art

Die Erfindung betrifft einen Brennstoffverteiler, der zur Verteilung von Brennstoff auf mehrere Brennstoffeinspritzventile dient, und ein Brennstoffeinspritzsystem mit solch einem Brennstoffverteiler und mehreren Brennstoffeinspritzventilen. Speziell betrifft die Erfindung das Gebiet der Brennstoffeinspritzsysteme, die zur Einspritzung, insbesondere zur Saugrohreinspritzung, von Erdgas bei Brennkraftmaschinen dienen.The invention relates to a fuel distributor, which serves to distribute fuel to a plurality of fuel injection valves, and a fuel injection system having such a fuel distributor and a plurality of fuel injection valves. Specifically, the invention relates to the field of fuel injection systems that are used for injection, in particular for port injection, of natural gas in internal combustion engines.

Aus der DE 10 2010 064 115 A1 ist eine Injektoranordnung für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen bekannt. Die bekannte Injektoranordnung umfasst eine Brennstoffverteilerleiste, einen Gegenhalter und Einspritzventile. Die Brennstoffverteilerleiste dient zum Verteilen von komprimiertem Erdgas auf die Einspritzventile. Ferner ist an die Brennstoffverteilerleiste ein Sensor montiert, der beispielsweise zum Messen des Druckes und der Temperatur des Erdgases in der Brennstoffverteilerleiste dient.From the DE 10 2010 064 115 A1 An injector arrangement for fuel injection systems of mixture-compression, spark-ignited internal combustion engines is known. The known injector assembly includes a fuel rail, an anvil, and injectors. The fuel rail is used to distribute compressed natural gas to the injectors. Further, a sensor is mounted to the fuel rail, which serves for example for measuring the pressure and the temperature of the natural gas in the fuel rail.

Die aus der DE 10 2010 064 115 A1 bekannte Injektoranordnung hat den Nachteil, dass die Herstellung der Brennstoffverteilerleiste, die aus Aluminium oder einem Edelstahl gebildet ist, gerade für größere Produktionsvolumen unwirtschaftlich in der Herstellung ist. Ferner müssen an der Brennstoffverteilerleiste ein Sensor und ein Anschlusselement montiert werden, um den Sensor einerseits mit der Brennstoffverteilerleiste und andererseits mit einer Steuereinrichtung zu verbinden. Hierfür sind zusätzliche Arbeitsschritte in der Fertigung erforderlich. Außerdem muss die Dichtstelle zwischen dem Sensor und der Brennstoffverteilerleiste zuverlässig ausgebildet werden, wobei über die Lebensdauer das Risiko besteht, dass die Dichtstelle undicht wird.The from the DE 10 2010 064 115 A1 known injector arrangement has the disadvantage that the production of the fuel rail, which is formed of aluminum or a stainless steel, especially for larger production volume is uneconomical to manufacture. Further, a sensor and a connection element must be mounted on the fuel rail to connect the sensor on the one hand with the fuel rail and on the other hand with a control device. This requires additional work steps in the production. In addition, the sealing point between the sensor and the fuel rail must be reliably formed, over the life of which there is a risk that the sealing point will leak.

Offenbarung der ErfindungDisclosure of the invention

Der erfindungsgemäße Brennstoffverteiler mit den Merkmalen des Anspruchs 1 und das erfindungsgemäße Brennstoffeinspritzsystem mit den Merkmalen des Anspruchs 8 haben den Vorteil, dass eine verbesserte Ausgestaltung ermöglicht ist. Insbesondere ist eine wirtschaftliche Herstellung des Brennstoffverteilers und des Brennstoffeinspritzsystems möglich, wobei zugleich eine einfache Fertigung oder Montage sowie eine verbesserte Abdichtung im Bereich des Sensors ermöglicht sind.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Anspruch 1 angegebenen Brennstoffverteilers möglich. Die Brennstoffeinspritzventile sind keine Bestandteile des Brennstoffverteilers. Insbesondere kann der Brennstoffverteiler auch unabhängig von den Brennstoffeinspritzventilen hergestellt und vertrieben werden.
Bei einer herkömmlichen Ausgestaltung handelt es sich bei dem Brennstoffverteiler und dem Sensor um voneinander getrennte Bauteile, die beispielsweise bei einer Vormontage miteinander verbunden werden. Bei einer herkömmlichen Ausgestaltung können auch der Sensor und der Sensoranschluss durch getrennte Bauteile realisiert sein. Bei der erfindungsgemäßen Ausgestaltung des Brennstoffverteilers ist der Sensor Bestandteile des Brennstoffverteilers. Ferner ist hierbei auch der Sensoranschluss des Sensors Bestandteil des Brennstoffverteilers. Denn der Sensoranschluss des Sensors ist in den Grundkörper des Brennstoffverteilers integriert. Je nach Ausgestaltung kann sich hierbei der gesamte Sensor in dem Grundkörper befinden. Allerdings kann der Sensor auch zumindest teilweise in den Brennstoffraum des Grundkörpers ragen. Dann ist zumindest der Sensoranschluss des Sensors in den Grundkörper integriert.
Vorteilhaft ist es, dass der Grundkörper ein Verteilerrohr aufweist, das aus einem Kunststoff gebildet ist. Der Brennstoffraum ist dann vorzugsweise innerhalb des Verteilerrohrs ausgestaltet. Somit kann der Brennstoff durch das Verteilerrohr geführt und auf die verschiedenen Brennstoffeinspritzventile aufgeteilt werden. Der Brennstoffraum kann hierbei gegebenenfalls auch als Brennstoffspeicher dienen. Speziell kann der Brennstoff als komprimiertes Erdgas in den Brennstoffraum eingebracht werden. Während das komprimierte Erdgas dann in den Brennstoffraum eingebracht wird, kann der Brennstoffraum im Verteilerrohr aufgrund seiner Speicherfunktion gewährleisten, dass bei der kurzzeitigen Entnahme von Erdgas der erforderliche Druck gewährleistet ist.The fuel distributor according to the invention with the features of claim 1 and the fuel injection system according to the invention with the features of claim 8 have the advantage that an improved design is possible. In particular, economical production of the fuel distributor and of the fuel injection system is possible, at the same time enabling simple production or assembly as well as improved sealing in the region of the sensor.
The measures listed in the dependent claims advantageous developments of the fuel distributor specified in claim 1 are possible. The fuel injectors are not part of the fuel distributor. In particular, the fuel distributor can also be manufactured and distributed independently of the fuel injection valves.
In a conventional embodiment, the fuel distributor and the sensor are separate components, which are connected to one another, for example, during a pre-assembly. In a conventional embodiment, the sensor and the sensor connection can also be realized by separate components. In the embodiment of the fuel distributor according to the invention, the sensor is part of the fuel distributor. Furthermore, the sensor connection of the sensor is also part of the fuel distributor. Because the sensor connection of the sensor is integrated in the body of the fuel distributor. Depending on the configuration, the entire sensor may be located in the base body. However, the sensor can also protrude at least partially into the fuel space of the main body. Then at least the sensor connection of the sensor is integrated into the main body.
It is advantageous that the main body has a manifold which is formed of a plastic. The fuel space is then preferably configured within the manifold. Thus, the fuel can be routed through the manifold and split among the various fuel injectors. If necessary, the fuel space can also serve as a fuel storage. Specifically, the fuel can be introduced as compressed natural gas in the fuel space. While the compressed natural gas is then introduced into the fuel space, the fuel space in the manifold due to its storage function can ensure that the short-term removal of natural gas, the required pressure is ensured.

Der Brennstoffverteiler dient somit in vorteilhafter Weise zum Verteilen von Erdgas auf die Brennstoffeinspritzventile. Hierbei kann auch ein Mischbetrieb einer Brennkraftmaschine mit Erdgas und einem anderen Brennstoff ermöglicht werden. Die Brennkraftmaschine kann insbesondere als Diesel- oder Ottomotor ausgestaltet sein. Das Erdgas wird hierbei vorzugsweise als komprimiertes Erdgas in einem Gasspeicher gespeichert, beispielsweise bei Drücken von etwa 20 MPa (200 bar). Solch ein komprimiertes Erdgas wird auch als CNG bezeichnet. Der Begriff des Erdgases ist allerdings nicht auf natürliches Erdgas beschränkt, sondern allgemein zu verstehen. Beispielsweise kann das Erdgas auch künstlich durch Kohlevergasung gewonnen werden. Daher sind unter dem Begriff Erdgas auch erdgasähnliche Brennstoffe zu verstehen.The fuel distributor thus serves advantageously for distributing natural gas to the fuel injection valves. In this case, a mixed operation of an internal combustion engine with natural gas and another fuel can be made possible. The internal combustion engine can be designed in particular as a diesel or gasoline engine. The natural gas is stored here preferably as compressed natural gas in a gas storage, for example at pressures of about 20 MPa (200 bar). Such a compressed natural gas is also called CNG. The concept of natural gas, however, is not limited to natural gas but is generally understood. For example, the natural gas can also be obtained artificially by coal gasification. Therefore, the term natural gas and natural gas-like fuels to understand.

Durch die Kunststoffausführung des Verteilerrohrs kann somit speziell für einen Erdgasbetrieb eine gerade bei großen Produktionsvolumen wirtschaftliche Herstellung erzielt werden. Der Grundkörper kann somit zumindest teilweise aus einem Kunststoff gebildet sein. Hierbei kann der Grundkörper auch zumindest teilweise aus einer Kunststoffumspritzung gebildet sein. Die Integration des Sensors in den Grundkörper kann hierbei durch die Kunststoffumspritzung erfolgen. Der Sensor kann hierbei als Funktionsbaugruppe ausgestaltet sein, die dadurch in vorteilhafter Weise in den Brennstoffverteiler integriert wird.Due to the plastic design of the distributor tube, it is thus possible to achieve economical production, especially for natural gas operation, especially with large production volumes. The main body can thus be at least partially formed of a plastic. Here, the base body may also be formed at least partially from a plastic extrusion. The integration of the sensor in the body can be done by the plastic extrusion. In this case, the sensor can be designed as a functional module, which is thereby advantageously integrated into the fuel distributor.

In vorteilhafter Weise können auch die Ausgänge, über die der Brennstoff aus dem Brennstoffraum zu den Brennstoffventilen führbar ist, in den Grundkörper integriert werden. Insbesondere können die Ausgänge durch Tassen gebildet sein, an denen die Brennstoffeinspritzventile befestigbar sind, wobei die Tassen in den Grundkörper integriert sind. Bei der Montage können dann Einlassstutzen der Brennstoffeinspritzventile in die Tassen eingefügt werden. Die Befestigung der Brennstoffeinspritzventile kann beispielsweise über als Klammern ausgestaltete Befestigungsmittel erfolgen. Solche Befestigungsmittel werden vorzugsweise an den Tassen befestigt, wobei die Befestigungsmittel dann den Einlassstutzen des jeweiligen Brennstoffeinspritzventils an der Tasse fixieren. Somit kann das Brennstoffeinspritzsystem aus einer geringen Anzahl aus Bauteilen hergestellt und in einfacher Weise montiert werden. Die Tassen können hierbei in vorteilhafter Weise aus einem Kunststoff gebildet sein. Dabei können die Tassen in vorteilhafter Weise ebenfalls in den Grundkörper integriert werden.Advantageously, the outputs, via which the fuel from the fuel chamber to the fuel valves can be performed, are integrated into the main body. In particular, the outputs may be formed by cups, to which the fuel injection valves can be fastened, the cups being integrated into the basic body. During assembly, inlet ports of the fuel injectors can then be inserted into the cups. The fastening of the fuel injection valves can take place, for example, via fastening means configured as clamps. Such fastening means are preferably attached to the cups, wherein the fastening means then fix the inlet nozzle of the respective fuel injection valve to the cup. Thus, the fuel injection system can be made of a small number of components and assembled in a simple manner. The cups may be advantageously formed from a plastic. The cups can also be integrated in an advantageous manner in the body.

Je nach Anwendungsfall kann der Grundkörper in vorteilhafter Weise von einer Vielzahl von Versteifungsrippen stabilisiert werden. Hierdurch kann auch der Materialeinsatz reduziert und der Herstellungsaufwand verringert werden.Depending on the application, the base body can be advantageously stabilized by a plurality of stiffening ribs. As a result, the use of materials can be reduced and the production costs are reduced.

Der Sensor kann in vorteilhafter Weise sowohl als Druck- als auch als Temperatursensor ausgestaltet sein. Bei einer abgewandelten Ausgestaltung ist es allerdings auch denkbar, dass ein weiterer Sensor mit einem Sensoranschluss vorgesehen ist, wobei zumindest der Sensoranschluss des weiteren Sensors in den Grundkörper integriert ist. Denkbar sind auch mehr als zwei Sensoren, wenn dies im jeweiligen Anwendungsfall sinnvoll ist. Bevorzugter Weise ist jedoch nur ein Sensoranschluss vorgesehen, da sich hierdurch der Platzbedarf reduziert und die Montage vereinfacht wird.The sensor can be configured advantageously both as a pressure sensor and as a temperature sensor. In a modified embodiment, however, it is also conceivable that a further sensor is provided with a sensor connection, wherein at least the sensor connection of the further sensor is integrated into the base body. Also conceivable are more than two sensors, if this makes sense in the respective application. Preferably, however, only one sensor connection is provided, as this reduces the space required and the assembly is simplified.

Kurze Beschreibung der ZeichnungShort description of the drawing

Bevorzugte Ausführungsbeispiele der Erfindung sind in der nachfolgenden Beschreibung unter Bezugnahme auf die beigefügte Zeichnung näher erläutert. Es zeigt:

  • Fig. 1 ein Brennstoffeinspritzsystem mit einem Brennstoffverteiler in einer räumlichen Darstellung entsprechend einem Ausführungsbeispiel der Erfindung.
Preferred embodiments of the invention are explained in more detail in the following description with reference to the accompanying drawings. It shows:
  • Fig. 1 a fuel injection system with a fuel distributor in a spatial representation according to an embodiment of the invention.

Ausführungsformen der ErfindungEmbodiments of the invention

Fig. 1 zeigt ein Brennstoffeinspritzsystem 1 mit einem Brennstoffverteiler 2 und mehreren Brennstoffeinspritzventilen 3, 4 in einer räumlichen Darstellung entsprechend einem Ausführungsbeispiel der Erfindung. Der Brennstoffverteiler 2 eignet sich besonders zur Verteilung von Erdgas, insbesondere von CNG, auf die Brennstoffeinspritzventile 3, 4. Der Brennstoffverteiler 2 kann allerdings auch zur Verteilung anderer Brennstoffe dienen. Entsprechend eignet sich das Brennstoffeinspritzsystem 1 besonders zur Saugrohreinspritzung von Erdgas bei Brennkraftmaschinen. Das Brennstoffeinspritzsystem 1 der Erfindung eignet sich jedoch auch für andere Anwendungsfälle. Fig. 1 shows a fuel injection system 1 with a fuel distributor 2 and a plurality of fuel injection valves 3, 4 in a three-dimensional representation according to an embodiment of the invention. The fuel distributor 2 is particularly suitable for distributing natural gas, in particular CNG, to the fuel injection valves 3, 4. However, the fuel distributor 2 can also be used to distribute other fuels. Accordingly, the fuel injection system 1 is particularly suitable for the intake manifold injection of natural gas in internal combustion engines. However, the fuel injection system 1 of the invention is also suitable for other applications.

Der Brennstoffverteiler 2 weist einen Grundkörper 5 mit einem Verteilerrohr 6 auf. Ferner ist ein Sensor 7 mit einem Sensoranschluss 8 vorgesehen. Zumindest der Sensoranschluss 8 des Sensors 7 ist in den Grundkörper 5 integriert. Dadurch ist der Sensoranschluss 8 mit dem Verteilerrohr 6 verbunden. Hierbei ist der Sensoranschluss 8 vorzugsweise einstückig mit dem Verteilerrohr 6 ausgestaltet. Der Grundkörper kann hierfür insbesondere aus einem Kunststoff gebildet sein. Bei der Ausgestaltung des Grundkörpers 5 können allerdings auch unterschiedliche Kunststoffe zum Einsatz kommen. Der Grundkörper 5 mit dem Verteilerrohr 6 und dem Sensoranschluss 8 kann zumindest teilweise aus einer Kunststoffumspritzung gebildet sein. Hierdurch kann der Sensoranschluss 8 durch die Kunststoffumspritzung in den Grundkörper 5 integriert werden.The fuel distributor 2 has a main body 5 with a distributor pipe 6. Furthermore, a sensor 7 with a sensor connection 8 is provided. At least the sensor connection 8 of the sensor 7 is integrated in the main body 5. As a result, the sensor connection 8 is connected to the distributor tube 6. In this case, the sensor connection 8 is preferably configured in one piece with the distributor tube 6. The main body can be formed for this purpose in particular from a plastic. In the embodiment of the main body 5, however, different plastics can be used. The main body 5 with the distributor tube 6 and the sensor connection 8 can be formed at least partially from a plastic extrusion coating. As a result, the sensor connection 8 can be integrated into the main body 5 by the plastic extrusion coating.

In dem Verteilerrohr 6 ist ein Innenraum 9 ausgebildet. Der Innenraum 9 dient als Brennstoffraum 9. An einen Anschluss 10 des Grundkörpers 5 kann eine Brennstoffleitung angeschlossen werden, um komprimiertes Erdgas oder andere Brennstoffe in den Brennstoffraum 9 einzuleiten.In the manifold 6, an interior 9 is formed. The interior space 9 serves as a fuel space 9. A fuel line can be connected to a connection 10 of the main body 5 in order to introduce compressed natural gas or other fuels into the fuel space 9.

Der Brennstoffverteiler 2 weist außerdem Ausgänge 11, 12 auf. In diesem Ausführungsbeispiel sind die Ausgänge 11, 12 durch Tassen 11, 12 gebildet, an denen die Brennstoffeinspritzventile 3, 4 befestigt sind. Zur Befestigung der Brennstoffeinspritzventile 3, 4 an dem Brennstoffverteiler 2 werden Einlassstutzen 13, 14 der Brennstoffeinspritzventile 3, 4 zumindest abschnittsweise in die Tassen 11, 12 eingefügt. Über als Klammern 15, 16 ausgestaltete Befestigungsmittel 15, 16 wird dann das jeweilige Brennstoffeinspritzventil 3, 4 an seinem Einlassstutzen 13, 14 mit der Tasse 11, 12 verbunden. Somit sind die Brennstoffeinspritzventile 3, 4 dann an den Tassen 11, 12 des Brennstoffverteilers 2 fixiert.The fuel distributor 2 also has outputs 11, 12. In this embodiment, the outputs 11, 12 are formed by cups 11, 12, to which the fuel injection valves 3, 4 are attached. For fastening the fuel injection valves 3, 4 to the fuel distributor 2, inlet stubs 13, 14 of the fuel injection valves 3, 4 are inserted into the cups 11, 12 at least in sections. By means of fasteners 15, 16 configured as brackets 15, 16, the respective fuel injection valve 3, 4 is then connected to the cup 11, 12 at its inlet connection 13, 14. Thus, the fuel injection valves 3, 4 are then fixed to the cups 11, 12 of the fuel distributor 2.

Die Tassen 11, 12 sind aus einem Kunststoff gebildet. Hierbei sind die Tassen 11, 12 in den Grundkörper 5 integriert. Speziell können die Tassen 11, 12 zusammen mit dem Verteilerrohr 6 aus einem gespritzten Kunststoff gebildet sein.The cups 11, 12 are formed of a plastic. Here, the cups 11, 12 are integrated into the main body 5. Specifically, the cups 11, 12 may be formed together with the manifold 6 of a molded plastic.

Somit können die Ausgänge 11, 12 in vorteilhafter Weise in den Grundkörper 5 integriert werden. Die Ausgänge 11, 12 können hierbei auch abgewandelt ausgestaltet sein. Somit kann aus dem Brennstoffraum 9 Brennstoff, insbesondere Erdgas, über die Ausgänge 11, 12 und die Einlassstutzen 13, 14 der Brennstoffeinspritzventile 3, 4 in die Brennstoffeinspritzventile 3, 4 geführt werden.Thus, the outputs 11, 12 can be integrated into the main body 5 in an advantageous manner. The outputs 11, 12 can also be designed modified. Thus, from the fuel chamber 9 fuel, in particular natural gas, via the outputs 11, 12 and the inlet ports 13, 14 of the fuel injection valves 3, 4 are guided in the fuel injection valves 3, 4.

Der Sensor 7 ist vorzugsweise als Druck- und Temperatursensor 7 ausgestaltet. An den Sensoranschluss 8 kann hierbei eine Signal- und/oder Stromleitung angeschlossen werden, um zumindest ein Messsignal zu übertragen und um den Sensor 7 gegebenenfalls mit Energie zu versorgen. In diesem Ausführungsbeispiel erstreckt sich das Verteilerrohr 6 entlang einer Längsachse 20. Es sind allerdings auch gebogene Ausgestaltungen des Verteilerrohrs 6 denkbar.The sensor 7 is preferably designed as a pressure and temperature sensor 7. In this case, a signal and / or power line can be connected to the sensor connection 8 in order to transmit at least one measurement signal and if necessary to supply the sensor 7 with energy. In this embodiment, the manifold 6 extends along a longitudinal axis 20. However, there are also curved embodiments of the manifold 6 conceivable.

Ferner weist der Grundkörper 5 in diesem Ausführungsbeispiel an dem Verteilerrohr 6 eine Vielzahl von Versteifungsrippen 21, 22, 23 auf. Zur Vereinfachung der Darstellung sind hierbei nur die Versteifungsrippen 21 bis 23 gekennzeichnet. Ein Teil der Versteifungsrippen 21, 22 erstreckt sich hierbei in einer Umfangsrichtung bezüglich der Längsachse 20. Ein anderer Teil der Versteifungsrippen 23 erstreckt sich parallel zu der Längsachse 20.Furthermore, the main body 5 in this embodiment on the manifold 6 a plurality of stiffening ribs 21, 22, 23. To simplify the illustration, only the stiffening ribs 21 to 23 are marked here. A part of the stiffening ribs 21, 22 extends in a circumferential direction with respect to the longitudinal axis 20. Another part of the stiffening ribs 23 extends parallel to the longitudinal axis 20.

Somit können der Brennstoffverteiler 2 und das Brennstoffeinspritzsystem 1 in einer kompakten Bauweise ausgeführt werden. In der Fertigung können hierbei die benötigten Arbeitsschritte reduziert werden. Ferner ist eine Kostenreduzierung möglich. Insbesondere kann durch einen zumindest teilweisen Einsatz von Kunststoff eine erhebliche Kosteneinsparung gegenüber metallischen Ausgestaltungen, insbesondere aus Aluminium oder Edelstahl, erzielt werden. Ferner wird das Risiko von undichten Dichtstellen zwischen dem Verteilerrohr 6 und dem Sensoranschluss 8 beziehungsweise dem Verteilerrohr 6 und den Tassen 11, 12 von vornherein vermieden, da solche Dichtstellen aufgrund der Integration des Sensoranschlusses 8 in den Grundkörper 5 beziehungsweise der Tassen 11, 12 in den Grundkörper 5 entfallen.Thus, the fuel distributor 2 and the fuel injection system 1 can be made in a compact construction. In manufacturing, the required work steps can be reduced. Furthermore, a cost reduction is possible. In particular, can be achieved by an at least partial use of plastic, a significant cost savings compared to metallic designs, in particular of aluminum or stainless steel. Furthermore, the risk of leaking sealing points between the manifold 6 and the sensor port 8 and the manifold 6 and the cups 11, 12 avoided from the outset, since such sealing points due to the integration of the sensor terminal 8 in the main body 5 and the cups 11, 12 in the Base 5 omitted.

Das Brennstoffeinspritzsystem 1 kann auch mehr als zwei Brennstoffeinspritzventile 3, 4 aufweisen. Die Anzahl der Ausgänge 11, 12, insbesondere Tassen 11, 12, kann hierbei an den jeweiligen Anwendungsfall angepasst werden. Hierbei kann insbesondere eine Erstreckung des Verteilerrohrs 6 entlang der Längsachse 20 entsprechend vorgegeben werden. Somit kann insbesondere in Bezug auf die Anzahl der Zylinder der Brennkraftmaschine eine geeignete Ausgestaltung des Brennstoffverteilers 2 und des Brennstoffeinspritzsystems 1 gewählt werden.The fuel injection system 1 may also have more than two fuel injection valves 3, 4. The number of outputs 11, 12, in particular cups 11, 12, can be adapted to the particular application. In particular, an extension of the distributor tube 6 along the longitudinal axis 20 can be predetermined accordingly. Thus, in particular with regard to the number of cylinders of the internal combustion engine, a suitable embodiment of the fuel distributor 2 and of the fuel injection system 1 can be selected.

Außerdem haben das Brennstoffeinspritzsystem 1 und der Brennstoffverteiler 2 den Vorteil, dass eine kompakte Ausgestaltung ermöglicht wird. Denn durch die Integration des Sensoranschlusses 8 in den Grundkörper 5 werden diesbezügliche separate Anschlussstücke eingespart, wobei eine Raum sparendere Ausgestaltung ermöglicht wird. Entsprechend kann der Platzbedarf im Bereich der Ausgänge 11, 12 beziehungsweise der Tassen 11, 12 des Verteilerrohrs 6 verringert werden. Insbesondere können hierbei mechanische Verbindungsstellen zwischen den Tassen 11, 12 und dem Verteilerrohr 6, insbesondere Schraubgewinde, entfallen. Dadurch können auch Ansätze oder dergleichen entfallen, die für die mechanische Stabilität solcher Schraubgewinde oder anderer mechanischer Verbindungsstellen ansonsten erforderlich sind.In addition, the fuel injection system 1 and the fuel distributor 2 have the advantage that a compact design is made possible. Because of the integration of the sensor terminal 8 in the main body 5 related separate connectors are saved, with a space-saving design is possible. Accordingly, the space requirement in the area of the outlets 11, 12 or the cups 11, 12 of the distributor tube 6 can be reduced. In particular, mechanical connection points between the cups 11, 12 and the distributor tube 6, in particular screw thread, can be omitted here. This also approaches or the like can be omitted, which are otherwise required for the mechanical stability of such screw thread or other mechanical connection points.

Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele beschränkt.The invention is not limited to the described embodiments.

Claims (8)

  1. Fuel distributor (2), which serves for the distribution of fuel, in particular natural gas, to multiple fuel injection valves (3, 4), having a main body (5) in which a fuel chamber (9) is provided, wherein the main body (5) has a distributor pipe (6), wherein an interior space (9) is formed in the distributor pipe (6), wherein the interior space (9) serves as fuel chamber (9),
    and multiple outlets (11, 12), via which the fuel can be conducted from the fuel chamber (9) to the fuel injection valves (3, 4), wherein at least one sensor (7) is provided, wherein the sensor (7) is provided with a sensor connector (8), wherein, here, a signal and/or electrical line can be connected to the sensor connector (8) for the purposes of transmitting at least one measurement signal and for the purposes of possibly supplying energy to the sensor (7),
    characterized
    in that at least the sensor connector (8) of the sensor (7) is integrated into the main body (5), wherein the main body (5) is formed at least partially from a plastics injection-moulded encapsulation, wherein the sensor connector (8) of the sensor (7) is integrated into the main body (5) by the plastics injection-moulded encapsulation, wherein the sensor connector (8) is formed in one piece with the distributor pipe (6).
  2. Fuel distributor according to Claim 1,
    characterized
    in that the distributor pipe (6) is formed from a plastic.
  3. Fuel distributor according to either of Claims 1 and 2,
    characterized
    in that the outlets (11, 12) are integrated into the main body (5).
  4. Fuel distributor according to one of Claims 1 to 3,
    characterized
    in that the outlets (11, 12) are formed by cups (11, 12) to which the fuel injection valves (3, 4) can be fastened, and in that the cups (11, 12) are integrated into the main body (5).
  5. Fuel distributor according to Claim 4,
    characterized
    in that the cups (11, 12) are formed from a plastic.
  6. Fuel distributor according to one of Claims 1 to 5,
    characterized
    in that the main body (5) has a multiplicity of stiffening ribs (21, 22, 23).
  7. Fuel distributor according to one of Claims 1 to 6,
    characterized
    in that the sensor (7) is formed as a pressure and/or temperature sensor (7).
  8. Fuel injection system (1) having a fuel distributor (2) according to one of Claims 1 to 7 and multiple fuel injection valves (3, 4), wherein the fuel injection valves (3, 4) are fastened by fastening means (15, 16) to the outlets (11, 12) of the fuel distributor (2).
EP14734757.9A 2013-07-31 2014-06-13 Fuel distributor and fuel injection system Active EP3027882B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013214965.4A DE102013214965A1 (en) 2013-07-31 2013-07-31 Fuel distributor and fuel injection system
PCT/EP2014/062357 WO2015014526A1 (en) 2013-07-31 2014-06-13 Fuel distributor and fuel injection system

Publications (2)

Publication Number Publication Date
EP3027882A1 EP3027882A1 (en) 2016-06-08
EP3027882B1 true EP3027882B1 (en) 2018-01-10

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EP (1) EP3027882B1 (en)
CN (1) CN105556109B (en)
BR (1) BR112016001752A2 (en)
DE (1) DE102013214965A1 (en)
WO (1) WO2015014526A1 (en)

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Publication number Priority date Publication date Assignee Title
CN108930612A (en) * 2017-05-27 2018-12-04 罗伯特·博世有限公司 Fuel injection device and fuel heating means
CN115750149A (en) * 2022-12-06 2023-03-07 哈尔滨工程大学 Cylindrical gas rail outer cover of LNG gas internal combustion engine

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DE19746563A1 (en) * 1997-10-22 1999-04-29 Bosch Gmbh Robert Fuel injection system for IC engine
US6247450B1 (en) * 1999-12-27 2001-06-19 Detroit Diesel Corporation Electronic controlled diesel fuel injection system
DE10058130A1 (en) * 2000-11-22 2002-05-23 Bosch Gmbh Robert Fuel injection system for internal combustion engine has high pressure collection chamber in which fuel is held under high pressure and at least one fuel injection valve connected to the collection chamber
JP4134681B2 (en) * 2002-10-31 2008-08-20 日産自動車株式会社 High pressure fuel piping for internal combustion engines
ITBO20040114A1 (en) * 2004-02-27 2004-05-27 Magneti Marelli Powertrain Spa BI-MATERIAL FUEL MANIFOLD FOR AN INTERNAL COMBUSTION ENGINE WITH DIRECT FUEL INJECTION AND METHOD FOR ITS REALIZATION
JP4695042B2 (en) * 2006-08-10 2011-06-08 株式会社ニッキ Add-on gas fuel injection system
DE102008040901A1 (en) * 2008-07-31 2010-02-04 Robert Bosch Gmbh Fuel pressure accumulator for an injection system for internal combustion engines
DE102012001076A1 (en) * 2012-01-20 2013-07-25 Veritas Ag Method for increasing a fatigue strength of a hollow body and associated hollow body

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CN105556109B (en) 2018-10-02
BR112016001752A2 (en) 2017-08-01
WO2015014526A1 (en) 2015-02-05
CN105556109A (en) 2016-05-04
EP3027882A1 (en) 2016-06-08
DE102013214965A1 (en) 2015-02-05

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