DE102010001254A1 - Fuel injection device for use as common rail injection system for self-ignition combustion engine, has fuel injector injecting fuel into combustion chamber, where ventilation of device into fuel tank takes place in low-pressure region - Google Patents
Fuel injection device for use as common rail injection system for self-ignition combustion engine, has fuel injector injecting fuel into combustion chamber, where ventilation of device into fuel tank takes place in low-pressure region Download PDFInfo
- Publication number
- DE102010001254A1 DE102010001254A1 DE201010001254 DE102010001254A DE102010001254A1 DE 102010001254 A1 DE102010001254 A1 DE 102010001254A1 DE 201010001254 DE201010001254 DE 201010001254 DE 102010001254 A DE102010001254 A DE 102010001254A DE 102010001254 A1 DE102010001254 A1 DE 102010001254A1
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- Germany
- Prior art keywords
- fuel
- pressure pump
- combustion engine
- high pressure
- low
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/007—Venting means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
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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)
Abstract
Description
Technisches GebietTechnical area
Die Erfindung betrifft eine Kraftstoffeinspritzvorrichtung für eine Brennkraftmaschine mit einem Kraftstofftank, aus dem mittels einer Vordruckpumpe gesteuert über eine Zumesseinheit und ein Überströmventil Kraftstoff zu einer Hochdruckpumpe gefördert wird, von der der Kraftstoff in einen Hochdruckspeicher weitergefördert wird, aus dem der Kraftstoff über zumindest einen Kraftstoffinjektor in einen Brennraum der Brennkraftmaschine einspritzbar ist und wobei eine Entlüftung der Kraftstoffeinspritzvorrichtung in den Kraftstofftank erfolgt.The invention relates to a fuel injection device for an internal combustion engine with a fuel tank, controlled by means of a pre-pressure pump via a metering unit and an overflow valve fuel to a high-pressure pump, from which the fuel is conveyed into a high-pressure accumulator, from which the fuel via at least one fuel injector in a combustion chamber of the internal combustion engine can be injected and wherein a venting of the fuel injection device takes place in the fuel tank.
Eine derartige Kraftstoffeinspritzvorrichtung ist aus der
Weiterhin sind Kraftstoffeinspritzvorrichtungen bekannt, bei denen eine Entlüftung nur mit einem hohen Zulaufdruck, der deutlich höher als 3 bar sein muss, entlüftet werden können. Dabei erfolgt dann die Entlüftung über den Hochdruckbereich, der durch den Summenöffnungsdruck eines Saugventils und eines Rückschlagventils definiert ist oder aber über das Überströmventil.Furthermore, fuel injectors are known in which a vent only with a high inlet pressure, which must be significantly higher than 3 bar, can be vented. In this case, then the venting takes place via the high-pressure region, which is defined by the sum of the opening pressure of a suction valve and a check valve or via the overflow valve.
Problematisch bei allen Systemen ist, dass die Entlüftung relativ lange dauert und zumindest teilweise ein hoher Entlüftungsdruck erforderlich ist. Dies ist aber für einen zuverlässigen Betrieb der Kraftstoffeinspritzvorrichtung nachteilig. Gegebenenfalls ist durch diese Entlüftungssysteme auch das Auftreten von Schäden an einzelnen Komponenten der Kraftstoffeinspritzvorrichtung nicht ausgeschlossen.The problem with all systems is that the vent takes a relatively long time and at least partially a high venting pressure is required. However, this is disadvantageous for a reliable operation of the fuel injection device. Optionally, the occurrence of damage to individual components of the fuel injection device is not excluded by these ventilation systems.
Der Erfindung liegt die Aufgabe zu Grunde, eine Entlüftung für eine Kraftstoffeinspritzvorrichtung bereitzustellen, die bei geringem schaltungstechnischem Aufwand schnell und zuverlässig arbeitet.The invention is based on the object to provide a vent for a fuel injection device, which works quickly and reliably with low circuit complexity.
Diese Aufgabe wird dadurch gelöst, dass die Entlüftung im Niederdruckbereich der Hochdruckpumpe erfolgt. Diese Ausgestaltung hat den Vorteil, dass die Entlüftung genau in dem Bereich erfolgt, aus zu dem die beispielsweise aus einem leergefahrenen Kraftstofftank angesaugte Luft problemlos und ohne irgendeine Beschädigungsgefahr der durchströmten Komponenten abgeführt werden kann. Andererseits ist durch die Entlüftung erst im Niederdruckbereich der Hochdruckpumpe sichergestellt, dass auch tatsächlich alle Leitungen und Systeme des Niederdrucksystems vollständig entlüftet werden und die Komponenten des Hochdrucksystems frei von Luft bleiben.This object is achieved in that the venting takes place in the low-pressure region of the high-pressure pump. This embodiment has the advantage that the venting takes place precisely in the region from which the air taken in, for example, from an empty fuel tank, can be removed without any problems and without any risk of damaging the through-flowed components. On the other hand, it is ensured by the venting only in the low-pressure region of the high-pressure pump, that actually all lines and systems of the low pressure system are completely vented and remain the components of the high pressure system free of air.
In Weiterbildung der Erfindung ist an den Innenraum der Hochdruckpumpe eine Entlüftungsleitung angeschlossen. Die aus dem beispielsweise leergefahrenen Kraftstofftank angesaugte Luft sammelt sich in dem Innenraum vor dem Eintritt in den Hochdruckförderteil der Hochdruckpumpe und kann (ebenso wie der im normalen Betrieb hier eintretende Kraftstoff) gezielt abgeführt werden. Diese gezielte (mengenmäßige) Abführung ist in allgemeiner Form durch den Durchmesser der Entlüftungsleitung eingestellt.In a further development of the invention, a vent line is connected to the interior of the high-pressure pump. The sucked from the example emptied fuel tank air accumulates in the interior before entering the high-pressure delivery section of the high-pressure pump and (as well as the entering here in normal operation fuel) can be selectively dissipated. This targeted (quantitative) discharge is set in general terms by the diameter of the vent line.
In weiterer Ausgestaltung der Erfindung weist die Entlüftungsleitung eine Drossel auf. Durch eine solche Drossel ist die Menge der abgeführten Luft beziehungsweise im Normalbetrieb des abgeführten Kraftstoffs genau einstellbar. Dabei beträgt in weiterer Ausgestaltung der Erfindung der Drosseldurchmesser 0,1 bis 1 mm, vorzugsweise 0,4 bis 0,6 mm. Hier ist eine genaue Abstimmung in Abhängigkeit des Fördervolumens der Vordruckpumpe vorzunehmen. In jedem Fall wird durch diese Ausgestaltung eine schnelle Entlüftung erreicht, wobei aber andererseits im Normalbetrieb keine übermäßig hohe Kraftstoffmenge aus dem Innenraum abgeführt wird.In a further embodiment of the invention, the vent line to a throttle. By such a throttle, the amount of discharged air or in normal operation of the discharged fuel is precisely adjustable. In another embodiment of the invention, the throttle diameter is 0.1 to 1 mm, preferably 0.4 to 0.6 mm. Here is an exact vote depending on the delivery volume of the pre-pressure pump to make. In any case, this embodiment achieves a rapid venting, but on the other hand, in normal operation, no excessively high amount of fuel is discharged from the interior.
In Weiterbildung der Erfindung ist der Drosseldurchmesser veränderbar. Eine solche Veränderung ist beispielsweise manuell oder über einen entsprechenden auf Luft ansprechenden Sensor automatisch einstellbar. Damit ist dann erreicht, dass tatsächlich nur dann, wenn Luft in dem Kraftstoffniederdruckbereich der Hochdruckpumpe vorhanden ist, eine Entlüftung durchgeführt wird.In a further development of the invention, the throttle diameter is variable. Such a change is automatically adjustable, for example, manually or via a corresponding air-responsive sensor. This then ensures that only when air is present in the fuel low pressure region of the high pressure pump, a vent is performed.
In weiterer Ausgestaltung mündet die Entlüftungsleitung in eine Kraftstoffrücklaufleitung ein. Dadurch ist nur ein sehr geringer leitungstechnischer Aufwand nötig.In a further embodiment, the vent line opens into a fuel return line. As a result, only a very small line engineering effort is needed.
In Weiterbildung der Erfindung sind Lagerstellen der Hochdruckpumpenantriebswelle mit einem Entlüftungskanal verschaltet, der ebenfalls in die Kraftstoffrücklaufleitung einmündet. Durch diese Ausgestaltung erfolgt zusätzlich auch eine Entlüftung in diesem Bereich, wobei dadurch zusätzlich sichergestellt ist, dass die Lagerstellen durch eine gezielte geringe Durchströmung mit Kraftstoff zuverlässig geschmiert werden. So ist es für eine schnelle und zuverlässige Entlüftung denkbar dem Innenraum der Hochdruckpumpe bedarfsweise durch den veränderbaren Drosseldurchmesser zu entlüften, während durch die Lagerstellen dauernd eine geringe Kraftstoffmenge abgeführt wird.In a further development of the invention, bearings of the high-pressure pump drive shaft are interconnected with a venting channel, which also opens into the fuel return line. In addition, this embodiment is also a Venting in this area, thereby additionally ensuring that the bearings are reliably lubricated by a targeted low flow with fuel. So it is conceivable for a quick and reliable vent the interior of the high-pressure pump, if necessary, to vent through the variable throttle diameter, while constantly through the bearings a small amount of fuel is dissipated.
Kurzbeschreibung der ZeichnungBrief description of the drawing
Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in der Figur dargestelltes Ausführungsbeispiel der Erfindung näher beschrieben ist.Further advantageous embodiments of the invention are described in the drawings, in which an illustrated in the figure embodiment of the invention is described in detail.
Ausführungsform der ErfindungEmbodiment of the invention
Die einzige Figur zeigt in schematischer Darstellung den Niederdruckbereich einer Kraftstoffeinspritzvorrichtung für eine Brennkraftmaschine. Diese Kraftstoffeinspritzvorrichtung ist als ein Common-Rail-Einspritzsystem insbesondere für selbstzündende Brennkraftmaschinen ausgebildet. Bei einem Common-Rail-Einspritzsystem wird der Kraftstoff von einer Hochdruckpumpe
Der Hochdruckpumpe
Strömungsausgangsseitig der Zumesseinheit
Das Gehäuse
Von den Hochdruckkomponenten der Hochdruckpumpe
Der Innenraum des Gehäuses
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 101006000002 A1 [0002] DE 101006000002 A1 [0002]
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010001254 DE102010001254A1 (en) | 2010-01-27 | 2010-01-27 | Fuel injection device for use as common rail injection system for self-ignition combustion engine, has fuel injector injecting fuel into combustion chamber, where ventilation of device into fuel tank takes place in low-pressure region |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010001254 DE102010001254A1 (en) | 2010-01-27 | 2010-01-27 | Fuel injection device for use as common rail injection system for self-ignition combustion engine, has fuel injector injecting fuel into combustion chamber, where ventilation of device into fuel tank takes place in low-pressure region |
Publications (1)
Publication Number | Publication Date |
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DE102010001254A1 true DE102010001254A1 (en) | 2011-07-28 |
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DE201010001254 Ceased DE102010001254A1 (en) | 2010-01-27 | 2010-01-27 | Fuel injection device for use as common rail injection system for self-ignition combustion engine, has fuel injector injecting fuel into combustion chamber, where ventilation of device into fuel tank takes place in low-pressure region |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011084356A1 (en) | 2011-10-12 | 2013-04-18 | Robert Bosch Gmbh | High-pressure fuel pump i.e. radial piston pump, for fuel injection system, has housing portion comprising bore for ventilating engine compartment of pump and throttle, and edge filter inserted into bore for formation of throttle |
DE102012200706A1 (en) | 2012-01-19 | 2013-07-25 | Robert Bosch Gmbh | Fuel injecting device for a combustion engine, has fuel tank connected with machine room of a high pressure pump by a booster pump engaged in a primary pressure line, where a filter engages in the primary pressure line |
DE102013201357A1 (en) | 2013-01-29 | 2014-07-31 | Robert Bosch Gmbh | high pressure pump |
DE102014207186A1 (en) | 2014-04-15 | 2015-10-15 | Robert Bosch Gmbh | Injector |
DE102014209214A1 (en) | 2014-05-15 | 2015-11-19 | Robert Bosch Gmbh | Fuel injection device for an internal combustion engine |
WO2017148599A1 (en) * | 2016-03-03 | 2017-09-08 | Robert Bosch Gmbh | Method for controlling an electromagnetically controllable suction valve |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006000002A1 (en) | 2005-01-28 | 2006-08-03 | Denso Corp., Kariya | Fuel supply device for pressure accumulation fuel injection system, has throttle insert arranged upstream of control valve to limit flow rate of fuel filtered by fuel filter, where high pressure of feed pump is applied on filter |
-
2010
- 2010-01-27 DE DE201010001254 patent/DE102010001254A1/en not_active Ceased
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006000002A1 (en) | 2005-01-28 | 2006-08-03 | Denso Corp., Kariya | Fuel supply device for pressure accumulation fuel injection system, has throttle insert arranged upstream of control valve to limit flow rate of fuel filtered by fuel filter, where high pressure of feed pump is applied on filter |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011084356A1 (en) | 2011-10-12 | 2013-04-18 | Robert Bosch Gmbh | High-pressure fuel pump i.e. radial piston pump, for fuel injection system, has housing portion comprising bore for ventilating engine compartment of pump and throttle, and edge filter inserted into bore for formation of throttle |
DE102012200706A1 (en) | 2012-01-19 | 2013-07-25 | Robert Bosch Gmbh | Fuel injecting device for a combustion engine, has fuel tank connected with machine room of a high pressure pump by a booster pump engaged in a primary pressure line, where a filter engages in the primary pressure line |
DE102013201357A1 (en) | 2013-01-29 | 2014-07-31 | Robert Bosch Gmbh | high pressure pump |
WO2014118181A1 (en) | 2013-01-29 | 2014-08-07 | Robert Bosch Gmbh | High-pressure pump |
DE102014207186A1 (en) | 2014-04-15 | 2015-10-15 | Robert Bosch Gmbh | Injector |
DE102014209214A1 (en) | 2014-05-15 | 2015-11-19 | Robert Bosch Gmbh | Fuel injection device for an internal combustion engine |
WO2017148599A1 (en) * | 2016-03-03 | 2017-09-08 | Robert Bosch Gmbh | Method for controlling an electromagnetically controllable suction valve |
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