EP1523618A1 - Fuel cooling in the return line of a pressure-boosted injection system - Google Patents

Fuel cooling in the return line of a pressure-boosted injection system

Info

Publication number
EP1523618A1
EP1523618A1 EP03732521A EP03732521A EP1523618A1 EP 1523618 A1 EP1523618 A1 EP 1523618A1 EP 03732521 A EP03732521 A EP 03732521A EP 03732521 A EP03732521 A EP 03732521A EP 1523618 A1 EP1523618 A1 EP 1523618A1
Authority
EP
European Patent Office
Prior art keywords
fuel
heat exchanger
pressure pump
bypass line
internal combustion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03732521A
Other languages
German (de)
French (fr)
Inventor
Michael Hoffmann
Magnus Korte
Ulrich Rieger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1523618A1 publication Critical patent/EP1523618A1/en
Withdrawn legal-status Critical Current

Links

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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/20—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for cooling
    • 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
    • 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
    • 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
    • F02M37/20—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 characterised by means for preventing vapour lock
    • 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
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/10—Fuel manifold
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a device for delivering fuel for a common-rail injection system of an internal combustion engine with a first fuel filter downstream after a low-pressure pump and a high-pressure pump connected via a fuel line for an injection rail of the internal combustion engine, and a bypass line following the injection rail, which flows downstream the low-pressure pump connects to the fuel line, the bypass line having a heat exchanger and a second filter.
  • a fuel circuit with a tank and a low-pressure pump connected via a fuel line is already known from US Pat. No. 5,794,598.
  • a fuel filter and then a high pressure pump is provided, which connects to the internal combustion engine.
  • a bypass is arranged, which connects to the fuel line again before or after the fuel filter, the bypass having a heat exchanger.
  • the heat exchanger is designed as a fuel-air or as a fuel-coolant and coolant-air heat exchanger.
  • An additional filter can also be arranged within the bypass.
  • the invention has for its object to design and arrange a fuel circuit for a common rail injection system such that simple and inexpensive cooling is ensured.
  • the heat exchanger is in operative connection with the cooling circuit of an air conditioning system and / or with the engine cooling of the internal combustion engine and / or with a charge air cooling.
  • This ensures that the existing cooling capacity for the internal combustion engine is partially usable for cooling the fuel circuit.
  • the proportion of the fuel volume flow delivered by the high-pressure pump, which is diverted via the bypass line is relatively large.
  • the existing or required cooling capacity of the engine cooling system and / or the charge air cooling system is lower here increases.
  • the available cooling capacity can thus be used for the engine cooling and / or the charge air cooling, since the cooling capacity is correspondingly low for the deactivated fuel component. According to the invention, these oppositely developing or required cooling capacities can be compensated for and optimally used.
  • an additional possibility is that the second fuel filter is arranged in front of the heat exchanger with reference to the flow direction. This prevents contamination of the fuel filter and the high-pressure pump due to residues in the internal combustion engine. Especially with fuel filters with very low cooling performance contamination flow must be avoided.
  • the heat exchanger is designed as a liquid coolant and / or air heat exchanger.
  • the corresponding cooling capacity can thus be achieved.
  • the heat exchanger has a common housing with the second fuel filter or that the heat exchanger is arranged on the second fuel filter. This arrangement simplifies installation and handling.
  • the heat exchanger is arranged in a vehicle-fixed manner directly with a body or directly on the internal combustion engine, in front of the charge air or water cooler and / or in front of the air conditioning condenser.
  • the arrangement of the heat exchanger can be adapted to the space available, in particular when retrofitting.
  • the heat exchanger connects to a charge air tube of the internal combustion engine and is operatively connected to it.
  • the cooling capacity required for the charge air can be used to cool the fuel if the charge air volume flow is low. This also results in very short fuel line lengths, since the charge air cooler is arranged directly in the area of the injection rail.
  • a first check valve is provided within the bypass line with reference to the flow direction after the injection rail. The excess fuel thus flows through the first check valve into the bypass line and can do not flow back into the injection rail due to reversing pressure conditions.
  • a second check valve is provided within the bypass line with respect to the flow direction after the heat exchanger or after the second filter. This second check valve prevents fuel from entering the bypass line from the low pressure pump.
  • Figure 1 is a schematic representation of a fuel circuit with low pressure and high pressure pump and bypass line with heat exchanger.
  • the fuel circuit according to FIG. 1 has a fuel tank 10, from which a fuel line 2 leads to an injection bar 4 of an internal combustion engine, not shown. After the fuel tank 10, a low pressure pump 1 is provided, to which a first fuel filter 7.1 is connected. After the first fuel filter 7.1, the fuel line 2 leads to a High-pressure pump 3, which supplies the injection bar 4 with highly compressed fuel.
  • bypass line 5 leads from the injection rail 4 back to the fuel line 2.
  • the bypass line 5 connects to the fuel line 2 between the low-pressure pump 1 and the high-pressure pump 3.
  • a second fuel filter 7.2 and a heat exchanger 6 connected to it are provided within the bypass line 5.
  • the heat exchanger 6 is in operative connection with a cooling circuit, not shown, or with the charge air cooler and / or the air conditioning system of the internal combustion engine.
  • the high-pressure pump 3 delivers more fuel than is supplied to the internal combustion engine via the injectors 11.1 to 11.4, so that the excessly delivered fuel flows through the bypass line 5 or flows back.
  • a return line 12 is provided to the bypass line 5, via which excess fuel from the injectors flows into the bypass line 5, the connection point of the return line being provided upstream of the second fuel filter 7.2 with respect to the flow direction.
  • a first check valve 8 is provided within the bypass line 5, which prevents the fuel from flowing back from the bypass line 5 into the injection bar 4.
  • a second check valve 9 is provided at the end of the bypass line 5 before connection to the fuel line 2, which prevents the backflow of fuel from the low-pressure pump 1 into the bypass line 5.
  • the bypass line 5 connects in relation to the flow direction upstream of the first fuel filter 7.1 and the first fuel filter 7.1 optionally forms a structural unit with the second fuel filter 7.2.

Abstract

The invention relates to a fuel circuit in a common-rail injection system, comprising a low-pressure pump (1), a high pressure pump (3) and a bypass line (5), for the injection rail (4), whereby said bypass line (5) has a second fuel filter (7.2) and a heat exchanger (6). The bypass line (5) returns excess fuel into the fuel line (2) between the low pressure pump (1) and the high pressure pump (3).

Description

Kraftstoffkühlung im Rücklauf eines druckübersetzten Fuel cooling in the return of a pressurized
Einspritzsystemsinjection
Die Erfindung bezieht sich auf eine Vorrichtung zum Fördern von Kraftstoff für ein common-rail Einspritzsystem einer Brennkraftmaschine mit einem ersten Kraftstoffilter stromab nach einer Niederdruckpumpe und einer über eine Kraftstoffleitung verbundenen Hochdruckpumpe für eine Einspritzleiste der Brennkraftmaschine sowie einer an die Einspritzleiste anschließenden Bypassleitung, die stromab nach der Niederdruckpumpe an die Kraftstoffleitung anschließt, wobei die Bypassleitung einen Wärmetauscher und einen zweiten Filter aufweist .The invention relates to a device for delivering fuel for a common-rail injection system of an internal combustion engine with a first fuel filter downstream after a low-pressure pump and a high-pressure pump connected via a fuel line for an injection rail of the internal combustion engine, and a bypass line following the injection rail, which flows downstream the low-pressure pump connects to the fuel line, the bypass line having a heat exchanger and a second filter.
Es ist bereits ein Kraftstoffkreislauf mit einem Tank und einer über eine Kraftstoffleitung verbundenen Niederdruckpumpe aus der US 5,794,598 bekannt. Nach der Niederdruckpumpe ist ein Kraftstoffilter und anschließend eine Hochdruckpumpe vorgesehen, die an die Brennkraftmaschine anschließt. Von der Hochdruckpumpe ausgehend ist ein Bypass angeordnet, der vor oder nach dem Kraftstoffilter wieder an die Kraftstoffleitung anschließt, wobei der Bypass einen Wärmetauscher aufweist. Der Wärmetauscher ist als Kraftstoff-Luft oder als Kraftstoff- Kühlmittel und Kühlmittel-Luft Wärmetauscher ausgebildet. Innerhalb des Bypass kann auch ein zusätzlicher Filter angeordnet sein. Der Erfindung liegt die Aufgabe zugrunde, einen Kraftstoffkreislauf für ein common-rail Einspritzsystem derart auszubilden und anzuordnen, daß eine einfache und kostengünstige Kühlung gewährleistet ist.A fuel circuit with a tank and a low-pressure pump connected via a fuel line is already known from US Pat. No. 5,794,598. After the low pressure pump, a fuel filter and then a high pressure pump is provided, which connects to the internal combustion engine. Starting from the high-pressure pump, a bypass is arranged, which connects to the fuel line again before or after the fuel filter, the bypass having a heat exchanger. The heat exchanger is designed as a fuel-air or as a fuel-coolant and coolant-air heat exchanger. An additional filter can also be arranged within the bypass. The invention has for its object to design and arrange a fuel circuit for a common rail injection system such that simple and inexpensive cooling is ensured.
Gelöst wird die Aufgabe erfindungsgemäß dadurch, daß der Wärmetauscher mit dem Kühlkreislauf einer Klimaanlage und/oder mit der Motorkühlung der Brennkraftmaschine und/oder mit einer Ladeluf kühlung in Wirkverbindung steht . Hierdurch wird erreicht, daß die vorhandene Kühlleistung für die Brennkraftmaschine teilweise für die Kühlung des Kraftstoffkreislaufs nutzbar ist. In den Betriebspunkten niedriger Leistung der Brennkraftmaschine ist der über die Bypassleitung abgesteuerte Anteil des durch die Hochdruckpumpe geförderten Kraftstoffvolumenstroms relativ groß. Die vorhandene bzw. benötigte Kühlleistung der Motorkühlung und/oder der Ladeluftkühlung ist hierbei geringer.- In den Betriebspunkten hoher Leistung der Brennkraftmaschine ist dagegen der abgesteuerte Anteil des durch die Hochdruckpumpe geförderten Kraftstoffvolumenstroms relativ klein, weil der Kraftstoffdurchsatz durch die Brennkraftmaschine im Verhältnis zur Hochdruckpumpenleistung stärker ansteigt . Die zur Verfügung stehende Kühlleistung kann somit für die Motorkühlung und/oder die Ladeluftkühlung verwendet werden, da die Kühlleistung für den abgesteuerten Kraftstoffanteil entsprechend gering ausfällt. Erfindungsgemäß können diese sich gegensätzlich entwickelnden bzw. benötigten Kühlleistungen kompensiert und optimal ausgenutzt werden.The object is achieved in that the heat exchanger is in operative connection with the cooling circuit of an air conditioning system and / or with the engine cooling of the internal combustion engine and / or with a charge air cooling. This ensures that the existing cooling capacity for the internal combustion engine is partially usable for cooling the fuel circuit. At the operating points of low power of the internal combustion engine, the proportion of the fuel volume flow delivered by the high-pressure pump, which is diverted via the bypass line, is relatively large. The existing or required cooling capacity of the engine cooling system and / or the charge air cooling system is lower here increases. The available cooling capacity can thus be used for the engine cooling and / or the charge air cooling, since the cooling capacity is correspondingly low for the deactivated fuel component. According to the invention, these oppositely developing or required cooling capacities can be compensated for and optimally used.
Eine zusätzliche Möglichkeit ist gemäß einer Weiterbildung, daß der zweite Kraftstoffilter mit Bezug zur Strömungsrichtung vor dem Wärmetauscher angeordnet ist. Somit wird eine Verschmutzung des Kraftstoffilters und der Hochdruckpumpe aufgrund von Rückständen in der Brennkraftmaschine verhindert. Gerade bei Kraftstoffiltern mit sehr geringem, die Kühlleistung steigerndem Strömungsquerschnitt ist eine Verschmutzung unbedingt zu vermeiden.According to a further development, an additional possibility is that the second fuel filter is arranged in front of the heat exchanger with reference to the flow direction. This prevents contamination of the fuel filter and the high-pressure pump due to residues in the internal combustion engine. Especially with fuel filters with very low cooling performance contamination flow must be avoided.
Ferner ist es vorteilhaft, daß der Wärmetauscher als Flüssigkühlmittel- und/oder Luftwärmetauscher ausgebildet ist. Damit kann die entsprechende Kühlleistung erreicht werden.It is also advantageous that the heat exchanger is designed as a liquid coolant and / or air heat exchanger. The corresponding cooling capacity can thus be achieved.
Hierzu ist es vorteilhaft, daß der Wärmetauscher mit dem zweiten Kraftstoffilter ein gemeinsames Gehäuse aufweist oder der Wärmetauscher an dem zweiten Kraftstoffilter angeordnet ist. Diese Anordnung vereinfacht den Einbau und die Handhabung.For this purpose, it is advantageous that the heat exchanger has a common housing with the second fuel filter or that the heat exchanger is arranged on the second fuel filter. This arrangement simplifies installation and handling.
Vorteilhaft ist es hierzu auch, daß der Wärmetauscher fahrzeugfest unmittelbar mit einer Karosserie oder unmittelbar an der Brennkraftmaschine, vor dem Ladeluft- oder Wasserkühler und/oder vor dem Klimakondensator angeordnet ist. Die Anordnung des Wärmetauschers kann den Bauraumverhältnissen, insbesondere bei einer Nachrüstung, angepaßt werden.It is also advantageous for this that the heat exchanger is arranged in a vehicle-fixed manner directly with a body or directly on the internal combustion engine, in front of the charge air or water cooler and / or in front of the air conditioning condenser. The arrangement of the heat exchanger can be adapted to the space available, in particular when retrofitting.
Gemäß einer bevorzugten Ausfuhrungsform der erfindungsgemäßen Lösung ist schließlich vorgesehen, daß der Wärmetauscher an ein Ladeluftröhr der Brennkraftmaschine anschließt und mit diesem in Wirkverbindung steht . Die für die Ladeluft notwendige Kühlleistung kann bei geringem Ladeluftvolumenstrom für die Kühlung des Kraftstoffs verwendet werden. Hierbei ergeben sich zudem sehr kurze Kraftstoffleitungslängen, da der Ladeluftkühler unmittelbar im Bereich der Einspritzleiste angeordnet ist .According to a preferred embodiment of the solution according to the invention, it is finally provided that the heat exchanger connects to a charge air tube of the internal combustion engine and is operatively connected to it. The cooling capacity required for the charge air can be used to cool the fuel if the charge air volume flow is low. This also results in very short fuel line lengths, since the charge air cooler is arranged directly in the area of the injection rail.
Von besonderer Bedeutung ist für die vorliegende Erfindung, daß innerhalb der Bypassleitung mit Bezug zur Strömungsrichtung nach der Einspritzleiste ein erstes Rückschlagventil vorgesehen ist. Der überschüssig anstehende Kraftstoff fließt somit über das erste Rückschlagventil in die Bypassleitung ab und kann aufgrund umkehrender Druckverhältnisse nicht mehr in die Einspritzleiste zurückströmen.It is of particular importance for the present invention that a first check valve is provided within the bypass line with reference to the flow direction after the injection rail. The excess fuel thus flows through the first check valve into the bypass line and can do not flow back into the injection rail due to reversing pressure conditions.
Im Zusammenhang mit der erfindungsgemäßen Ausbildung und Anordnung ist es von Vorteil, daß innerhalb der Bypassleitung mit Bezug zur Strömungsrichtung nach dem Wärmetauscher oder nach dem zweiten Filter ein zweites Rückschlagventil vorgesehen ist. Dieses zweite Rückschlagventil verhindert einen Kraftstoffeintritt in die Bypassleitung ausgehend von der Niederdruckpumpe .In connection with the design and arrangement according to the invention, it is advantageous that a second check valve is provided within the bypass line with respect to the flow direction after the heat exchanger or after the second filter. This second check valve prevents fuel from entering the bypass line from the low pressure pump.
Vorteilhaft ist es ferner, daß die Bypassleitung mit Bezug zur Strömungsrichtung' nach der Niederdruckpumpe und/oder vor dem ersten Kraftstoffilter anschließt und der erste Kraftstoffilter sowie der zweite Kraftstoffilter ein gemeinsames Gehäuse aufweisen. Hierdurch wird die Anordnung eines getrennten Filtergehäuses vermieden und der Wartungsaufwand reduziert.It is also advantageous that the bypass line with respect to the flow direction 'after the low-pressure pump and / or before the first fuel filter connects, and the first fuel and the second fuel filter have a common housing. This avoids the arrangement of a separate filter housing and reduces the maintenance effort.
Weitere Vorteile und Einzelheiten der Erfindung sind in den Patentansprüchen und in der Beschreibung erläutert und in der Figur dargestellt. Es zeigt:Further advantages and details of the invention are explained in the patent claims and in the description and shown in the figure. It shows:
Figur 1 eine schematische Darstellung eines Kraftstoffkreislaufs mit Niederdruck- und Hochdruckpumpe sowie Bypassleitung mit Wärmetauscher.Figure 1 is a schematic representation of a fuel circuit with low pressure and high pressure pump and bypass line with heat exchanger.
Der Kraftstoffkreislauf gemäß Figur 1 weist einen Kraftstofftank 10 auf, von dem aus eine Kraftstoffleitung 2 zu einer Einspritzleiste 4 einer nicht dargestellten Brennkraftmaschine führt. Nach dem Kraftstofftank 10 ist eine Niederdruckpumpe 1 vorgesehen, an die ein erster Kraftstoffilter 7.1 anschließt. Nach dem ersten Kraftstoffilter 7.1 führt die Kraftstoffleitung 2 zu einer Hochdruckpumpe 3, die die Einspritzleiste 4 mit hochverdichtetem Kraftstoff versorgt.The fuel circuit according to FIG. 1 has a fuel tank 10, from which a fuel line 2 leads to an injection bar 4 of an internal combustion engine, not shown. After the fuel tank 10, a low pressure pump 1 is provided, to which a first fuel filter 7.1 is connected. After the first fuel filter 7.1, the fuel line 2 leads to a High-pressure pump 3, which supplies the injection bar 4 with highly compressed fuel.
Von der Einspritzleiste 4 führt, neben dem Anschluß von Injektoren 11.1 bis 11.4, eine Bypassleitung 5 zurück an die Kraftstoffleitung 2. Die Bypassleitung 5 schließt hierbei zwischen der Niederdruckpumpe 1 und der Hochdruckpumpe 3 an die Kraftstoffleitung 2 an.In addition to the connection of injectors 11.1 to 11.4, a bypass line 5 leads from the injection rail 4 back to the fuel line 2. The bypass line 5 connects to the fuel line 2 between the low-pressure pump 1 and the high-pressure pump 3.
Innerhalb der Bypassleitung 5 ist ein zweiter Kraftstoffilter 7.2 sowie ein daran anschließender Wärmetauscher 6 vorgesehen. Der Wärmetauscher 6 steht hierbei mit einem nicht dargestellten Kühlkreislauf bzw. mit dem Ladeluftkühler und/oder der Klimaanlage der Brennkraftmaschine in Wirkverbindung.A second fuel filter 7.2 and a heat exchanger 6 connected to it are provided within the bypass line 5. The heat exchanger 6 is in operative connection with a cooling circuit, not shown, or with the charge air cooler and / or the air conditioning system of the internal combustion engine.
Die Hochdruckpumpe 3 fördert mehr Kraftstoff, als über die Injektoren 11.1 bis 11.4 der Brennkraftmaschine zugeführt wird, so daß der überschüssig geförderte Kraftstoff über die Bypassleitung 5 abfließt bzw. zurückfließt. An die Bypassleitung 5 anschließend ist eine Rücklaufleitung 12 vorgesehen, über die überschüssiger Kraftstoff der Injektoren in die Bypassleitung 5 fließt, wobei die Anschlußstelle der Rücklaufleitung mit Bezug zur Strömungsrichtung vor dem zweiten Kraftstoffilter 7.2 vorgesehen ist.The high-pressure pump 3 delivers more fuel than is supplied to the internal combustion engine via the injectors 11.1 to 11.4, so that the excessly delivered fuel flows through the bypass line 5 or flows back. A return line 12 is provided to the bypass line 5, via which excess fuel from the injectors flows into the bypass line 5, the connection point of the return line being provided upstream of the second fuel filter 7.2 with respect to the flow direction.
Anschließend an die Einspritzleiste 4 ist innerhalb der Bypassleitung 5 ein erstes Rückschlagventil 8 vorgesehen, das eine Rückstrδmung des Kraftstoffs von der Bypassleitung 5 in die Einspritzleiste 4 verhindert. Zudem ist am Ende der Bypassleitung 5 vor dem Anschluß an die Kraftsto fleitung 2 ein zweites Rückschlagventil 9 vorgesehen, welches das Rückströmen von Kraftstoff von der Niederdruckpumpe 1 in die Bypassleitung 5 verhindert. In einem nicht dargestellten Ausführungsbeispiel ist es vorgesehen, daß die Bypassleitung 5 mit Bezug zur Strömungsrichtung vor dem ersten Kraftstoffilter 7.1 anschließt und der erste Kraftstoffilter 7.1 mit dem zweiten Kraftstoffilter 7.2 wahlweise eine Baueinheit bildet. Following the injection bar 4, a first check valve 8 is provided within the bypass line 5, which prevents the fuel from flowing back from the bypass line 5 into the injection bar 4. In addition, a second check valve 9 is provided at the end of the bypass line 5 before connection to the fuel line 2, which prevents the backflow of fuel from the low-pressure pump 1 into the bypass line 5. In an exemplary embodiment, not shown, it is provided that the bypass line 5 connects in relation to the flow direction upstream of the first fuel filter 7.1 and the first fuel filter 7.1 optionally forms a structural unit with the second fuel filter 7.2.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Niederdruckpumpe1 low pressure pump
2 Kraftstoffleitung2 fuel line
3 Hochdruckpumpe3 high pressure pump
4 Einspritzleiste4 fuel rail
5 Bypassleitung5 bypass line
6 Wärmetauscher6 heat exchangers
7.1 erster Kraftstoffilter7.1 first fuel filter
7.2 zweiter Kraftstoffilter7.2 second fuel filter
8 erstes Rückschlagventil8 first check valve
9 zweites Rückschlagventil9 second check valve
10 Kraftstofftank10 fuel tank
11.1 Injektor11.1 injector
11.2 Injektor11.2 injector
11.3 Injektor11.3 injector
11.4 Injektor11.4 injector
12 Rücklaufleitung 12 return line

Claims

DaimlerChrysler AGPatentansprüche DaimlerChrysler AG patent claims
1. Vorrichtung zum Fördern von Kraftstoff für ein common-rail Einspritzsystem einer Brennkraftmaschine mit einem ersten Kraftstoffilter (7.1) stromab nach einer Niederdruckpumpe (1) und einer über eine Kraftstoffleitung (2) verbundenen Hochdruckpumpe (3) für eine Einspritzleiste (4) der Brennkraftmaschine sowie einer an die Einspritzleiste (4) anschließenden Bypassleitung (5) , die stromab nach der Niederdruckpumpe (1) an die Kraftstoffleitung (2) anschließt, wobei die Bypassleitung (5) einen Wärmetauscher (6) und einen zweiten Filter (7.2) aufweist, d a d u r c h g e k e nn z e i c h n e t , daß der Wärmetauscher (6) mit einem Kühlkreislauf einer Klimaanlage und/oder der Brennkraftmaschine und/oder einer Ladeluftkühlung in Wirkverbindung steht .1. Device for delivering fuel for a common rail injection system of an internal combustion engine with a first fuel filter (7.1) downstream after a low pressure pump (1) and a high pressure pump (3) connected via a fuel line (2) for an injection rail (4) of the internal combustion engine and a bypass line (5) which adjoins the injection bar (4) and which connects downstream of the low pressure pump (1) to the fuel line (2), the bypass line (5) having a heat exchanger (6) and a second filter (7.2), characterized in that the heat exchanger (6) is operatively connected to a cooling circuit of an air conditioning system and / or the internal combustion engine and / or charge air cooling.
2. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß der zweite Kraftstoffilter (7.2) in Strδmungsrichtung vor dem Wärmetauscher (6) angeordnet ist. 2. Device according to claim 1, characterized in that the second fuel filter (7.2) is arranged in the flow direction upstream of the heat exchanger (6).
3. Vorrichtung nach Anspruch 1 oder 2 , d a d u r c h g e k e n n z e i c h n e t , daß der Wärmetauscher (6) luftgekühlt ausgebildet ist.3. Device according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that the heat exchanger (6) is air-cooled.
4. Vorrichtung nach einem der vorhergehenden Ansprüche, d a du r c h g e k e n n z e i c h n e t , daß der Wärmetauscher (6) mit dem zweiten Kraftstoffilter (7.2) ein gemeinsames Gehäuse aufweist oder der Wärmetauscher (6) an dem zweiten Kraftstoffilter (7.2) angeordnet ist.4. Device according to one of the preceding claims, that the heat exchanger (6) with the second fuel filter (7.2) has a common housing or the heat exchanger (6) is arranged on the second fuel filter (7.2).
5. Vorrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß der Wärmetauscher (6) fahrzeugfest unmittelbar mit einer Karosserie oder unmittelbar an der Brennkraftmaschine, vor dem Ladeluft- oder Wasserkühler und/oder vor dem Klimakondensator angeordnet ist .5. Device according to one of the preceding claims, that the heat exchanger (6) is arranged directly on the vehicle directly with a body or directly on the internal combustion engine, in front of the charge air or water cooler and / or in front of the air conditioning condenser.
6. Vorrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß der Wärmetauscher (6) an ein Ladeluftrohr der Brennkraftmaschine anschließt und mit diesem in Wirkverbindung steht . 6. Device according to one of the preceding claims, characterized in that the heat exchanger (6) connects to a charge air pipe of the internal combustion engine and is in operative connection therewith.
7. Vorrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß innerhalb der Bypassleitung (5) stromab nach der7. Device according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that within the bypass line (5) downstream after the
Einspritzleiste (4) ein erstes Rückschlagventil (8) vorgesehen ist.Injection strip (4) a first check valve (8) is provided.
8. Vorrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß innerhalb der Bypassleitung (5) stromab nach dem Wärmetauscher (6) oder nach dem zweiten Filter (7.2) ein zweites Rückschlagventil (9) vorgesehen ist.8. Device according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that a second check valve (9) is provided downstream of the heat exchanger (6) or after the second filter (7.2) within the bypass line (5).
9. Vorrichtung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß die Bypassleitung (5) stromab nach der Niederdruckpumpe (1) und vor dem ersten Kraftstoffilter (7.1) an die Kraftstoffleitung (2) anschließt.9. Device according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the bypass line (5) downstream of the low pressure pump (1) and before the first fuel filter (7.1) to the fuel line (2).
10. Vorrichtung nach Anspruch 9, d a d u r c h g e k e n n z e i c h n e t , daß der erste Kraftstoffilter (7.1) und der zweite10. The apparatus of claim 9, d a d u r c h g e k e n n z e i c h n e t that the first fuel filter (7.1) and the second
Kraftstoffilter (7.2) ein gemeinsames Gehäuse aufweisen. Fuel filter (7.2) have a common housing.
EP03732521A 2002-07-18 2003-06-03 Fuel cooling in the return line of a pressure-boosted injection system Withdrawn EP1523618A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10232514A DE10232514A1 (en) 2002-07-18 2002-07-18 Fuel cooling in the return of a pressure-intensified injection system
DE10232514 2002-07-18
PCT/EP2003/005764 WO2004009990A1 (en) 2002-07-18 2003-06-03 Fuel cooling in the return line of a pressure-boosted injection system

Publications (1)

Publication Number Publication Date
EP1523618A1 true EP1523618A1 (en) 2005-04-20

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EP03732521A Withdrawn EP1523618A1 (en) 2002-07-18 2003-06-03 Fuel cooling in the return line of a pressure-boosted injection system

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Country Link
US (1) US7150270B2 (en)
EP (1) EP1523618A1 (en)
JP (1) JP4203474B2 (en)
KR (1) KR20050021507A (en)
CN (1) CN100400847C (en)
DE (1) DE10232514A1 (en)
WO (1) WO2004009990A1 (en)

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US20050150480A1 (en) 2005-07-14
JP4203474B2 (en) 2009-01-07
CN1668840A (en) 2005-09-14
CN100400847C (en) 2008-07-09
WO2004009990A1 (en) 2004-01-29
DE10232514A1 (en) 2004-01-29
JP2005539167A (en) 2005-12-22
KR20050021507A (en) 2005-03-07
US7150270B2 (en) 2006-12-19

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