EP1119704A1 - Pump arrangement for providing fuel at high pressure - Google Patents

Pump arrangement for providing fuel at high pressure

Info

Publication number
EP1119704A1
EP1119704A1 EP99936424A EP99936424A EP1119704A1 EP 1119704 A1 EP1119704 A1 EP 1119704A1 EP 99936424 A EP99936424 A EP 99936424A EP 99936424 A EP99936424 A EP 99936424A EP 1119704 A1 EP1119704 A1 EP 1119704A1
Authority
EP
European Patent Office
Prior art keywords
pump
pressure
fuel
valve
pressure pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99936424A
Other languages
German (de)
French (fr)
Other versions
EP1119704B1 (en
Inventor
Gerhard Geyer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1119704A1 publication Critical patent/EP1119704A1/en
Application granted granted Critical
Publication of EP1119704B1 publication Critical patent/EP1119704B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing
    • F04B49/246—Bypassing by keeping open the outlet valve

Definitions

  • the invention relates to a pump arrangement according to the preamble of patent claim 1.
  • Such a pump arrangement is already known (DE 195 49 108 AI), in which the flow control valve, in its position blocking the flow to the high-pressure pump, controls the fuel supplied by the low-pressure pump to the fuel tank.
  • a flow control valve designed as a slide valve has a more or less large leakage current due to its design.
  • the suction of the leakage current through one or more of the pump elements of the high-pressure pump should be avoided.
  • High-pressure pump in the "zero delivery" operating state does not deliver fuel because the differential pressure valve is not overcome by the leakage current of the flow control valve.
  • the suction valves of the high-pressure pump can be set to a very low opening pressure, which in turn ensures that the pump elements are evenly filled with fuel in the "partial filling" operating state "ensures. Opening pressure tolerances and changes over the lifespan of suction valves set in this way have only a minor influence on the equal delivery of the pump elements.
  • An embodiment of the invention is shown schematically simplified in the drawing using a hydraulic circuit diagram for a pump arrangement for generating high fuel pressure and is explained in more detail in the following description.
  • High-pressure fuel generation is intended for a fuel injection system used in internal combustion engines, in particular a common rail injection system.
  • the pump arrangement has a low-pressure pump 1, which is connected on the suction side to a diesel fuel, for example containing fuel tank 2 is connected.
  • a delivery line 3 extends from the low-pressure pump 1 on the pressure side, in which a flow control valve 4 and a differential pressure valve 5 are arranged in succession downstream. Between the flow control valve 4 and the
  • Differential pressure valve 5 extends from the delivery line 3 to the return line 6 leading to the fuel tank 2.
  • a throttle 7 is arranged in the return line 6.
  • the pump arrangement also includes a high-pressure pump 10 with three pump elements 11. These each have a pump piston 12 and a suction valve 14 and pressure valve 15 connected to a displacement chamber 13 of the pump element 11.
  • the delivery line 3 is connected to the suction valves 14 of the pump elements 11 after a branch following the outflow side of the differential pressure valve 5.
  • Line branches of a high-pressure fuel line 18 extend from the pressure valves 15 of the pump elements 11 and lead to a high-pressure fuel reservoir (not shown) of the fuel injection system.
  • the low-pressure pump 1 and the high-pressure pump 10 of the pump arrangement are each protected against overload by pressure relief valves, not shown.
  • the fuel drawn from the fuel tank 2 by the low-pressure pump 1 is used by the low-pressure pump 1 .
  • the low-pressure pump 1 and the high-pressure pump 10 are constant pumps.
  • the suction valves 14 of the pump elements 11 of the high-pressure pump 10 are, as shown schematically in simplified form, as an unloaded check valve. Deviating from the illustration, the suction valves 14 can also be designed as spring-loaded check valves. It is essential to the invention that the suction valves 14 are set to a very low opening pressure.
  • the differential pressure valve 5 in the delivery line 3 has an opening pressure which is greater than that of the suction valves 14.
  • the flow control valve 4 arranged upstream of the differential pressure valve 5 in the delivery line 3 is designed as a slide valve and consequently has a fuel leakage flow in its closed position, which follows the flow control valve in the throttled return line 6 is derived without switching the differential pressure valve to its open position.

Landscapes

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

Abstract

The inventive pump arrangement has a low-pressure pump (1) which draws fuel out of a fuel tank (2) and a high-pressure pump (10) with several pump elements (11). A supply line (3) leads from the low-pressure pump (1) to a suction valve (14) of each of the pump elements (11) respectively. A slide-type flow-regulating valve (4) and a differential pressure valve (5) are located in the supply line (3), the differential pressure valve being arranged on the exit side of the flow-regulating valve. A return line (6) leading to the fuel tank (2) branches off between the two valves (4, 5). The differential pressure valve (5) has an opening pressure that is greater than that of the suction valves (14). This prevents fuel from being drawn through the pump elements (11) when the high-pressure pump (10) is at zero delivery, but also ensures that the pump elements (11) are essentially evenly filled with fuel when the high-pressure pump (10) is operating and is partially full. The inventive pump arrangement for providing fuel at high pressure can be used in fuel injection systems of internal combustion engines, especially common-rail injection systems.

Description

Pumpenanordnung zur KraftstoffhochdruckerzeugungPump arrangement for high-pressure fuel generation
Stand der TechnikState of the art
Die Erfindung geht aus von einer Pumpenanordnung nach der Gattung des Patentanspruchs 1.The invention relates to a pump arrangement according to the preamble of patent claim 1.
Es ist schon eine solche Pumpenanordnung bekannt (DE 195 49 108 AI) , bei welcher das Stromregelventil in seiner den Förderstrom zur Hochdruckpumpe absperrenden Stellung den von der Niederdruckpumpe herangeführten Kraftstoff zum Kraftstoffbehälter absteuert. Ein in Schieberbauart ausgebildetes Stromregelventil hat bauartbedingt einen mehr oder weniger großen Leckstrom. Im Betriebszustand „Nullförderung" der Hochdruckpumpe soll jedoch das Ansaugen des Leckstroms durch eines oder mehrere der Pumpenelemente der Hochdruckpumpe vermieden werden. Dies erfordert das Einstellen der Saugventile der Hochdruckpumpe auf einen relativ hohen Öffnungsdruck mit der nachteiligen Folge, daß im Betriebszustand „Teilfüllung" Öffnungsdruck- und Durchflußtoleranzen eine ungleichmäßige Füllung derSuch a pump arrangement is already known (DE 195 49 108 AI), in which the flow control valve, in its position blocking the flow to the high-pressure pump, controls the fuel supplied by the low-pressure pump to the fuel tank. A flow control valve designed as a slide valve has a more or less large leakage current due to its design. In the “zero delivery” operating state of the high-pressure pump, however, the suction of the leakage current through one or more of the pump elements of the high-pressure pump should be avoided. This requires the suction valves of the high-pressure pump to be set to a relatively high opening pressure, with the disadvantageous consequence that in the “partial filling” operating state opening pressure is and flow tolerances an uneven filling of the
Pumpenelemente und damit eine ungleichförmige Förderung der Hochdruckpumpe bewirken. UnterschiedlichesPump elements and thus a non-uniform delivery of the high pressure pump. Different
Verschleißverhalten der Saugventile über die Lebensdauer der Pumpe kann zu einer weiteren Verschlechterung der Gleichförderung führen. Vorteile der ErfindungWear behavior of the suction valves over the life of the pump can lead to a further deterioration in equal delivery. Advantages of the invention
Die erfindungsgemäße Pumpenanordnung mit den Merkmalen des Patentanspruchs 1 hat demgegenüber den Vorteil, daß dieThe pump arrangement according to the invention with the features of claim 1 has the advantage that the
Hochdruckpumpe im Betriebszustand „Null-Förderung" keinen Kraftstoff fördert, weil das Differenzdruckventil vom Leckstrom des Stromregelventils nicht überwunden wird. Demzufolge können die Saugventile der Hochdruckpumpe auf einen sehr niedrigen Öffnungsdruck eingestellt werden, was wiederum die gleichmäßige Füllung der Pumpenelemente mit Kraftstoff im Betriebszustand „Teilfüllung" sicherstellt. Öffnungsdrucktoleranzen und -änderungen über die Lebensdauer derart eingestellter Saugventile haben nur einen geringen Einfluß auf die Gleichförderung der Pumpenelemente.High-pressure pump in the "zero delivery" operating state does not deliver fuel because the differential pressure valve is not overcome by the leakage current of the flow control valve. As a result, the suction valves of the high-pressure pump can be set to a very low opening pressure, which in turn ensures that the pump elements are evenly filled with fuel in the "partial filling" operating state "ensures. Opening pressure tolerances and changes over the lifespan of suction valves set in this way have only a minor influence on the equal delivery of the pump elements.
Eine vorteilhafte Weiterbildung der erfindungsgemäßen Pumpenanordnung ist im Anspruch 2 angegeben.An advantageous development of the pump arrangement according to the invention is specified in claim 2.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung anhand eines Hydraulikschaltplans für eine Pumpenanordnung zur Kraftstoffhochdruckerzeugung schematisch vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert .An embodiment of the invention is shown schematically simplified in the drawing using a hydraulic circuit diagram for a pump arrangement for generating high fuel pressure and is explained in more detail in the following description.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Die dargestellte Pumpenanordnung zurThe pump arrangement shown for
Kraftstoffhochdruckerzeugung ist für ein in Brennkraftmaschinen eingesetztes Kraftstoffeinspritzsystem, insbesondere Common-Rail-Einspritzsystem, bestimmt. Die Pumpenanordnung weist eine Niederdruckpumpe 1 auf, welche saugseitig an einen beispielsweise Dieselkraftstoff enthaltenden Kraftstoffbehälter 2 angeschlossen ist . Von der Niederdruckpumpe 1 geht druckseitig eine Förderleitung 3 aus, in welcher stromabwärts aufeinanderfolgend ein Stromregelventil 4 und ein Differenzdruckventil 5 angeordnet sind. Zwischen dem Stromregelventil 4 und demHigh-pressure fuel generation is intended for a fuel injection system used in internal combustion engines, in particular a common rail injection system. The pump arrangement has a low-pressure pump 1, which is connected on the suction side to a diesel fuel, for example containing fuel tank 2 is connected. A delivery line 3 extends from the low-pressure pump 1 on the pressure side, in which a flow control valve 4 and a differential pressure valve 5 are arranged in succession downstream. Between the flow control valve 4 and the
Differenzdruckventil 5 geht von der Förderleitung 3 eine zum Kraftstoffbehälter 2 führende Rücklaufleitung 6 aus. In der Rücklaufleitung 6 ist eine Drossel 7 angeordnet .Differential pressure valve 5 extends from the delivery line 3 to the return line 6 leading to the fuel tank 2. A throttle 7 is arranged in the return line 6.
Zu der Pumpenanordnung gehört außerdem eine Hochdruckpumpe 10 mit drei Pumpenelementen 11. Diese weisen jeweils einen Pumpenkolben 12 und ein an einen Verdrängerraum 13 des Pumpenelements 11 angeschlossenes Saugventil 14 und Druckventil 15 auf. Die an einem Hubring 16 durch Federkraft abgestützten Pumpenkolben 12 sind von einer Exzenterwelle 17 antreibbar, welche ebenso wie die Niederdruckpumpe 1 mit der nicht dargestellten Brennkraftmaschine gekoppelt ist. Die Förderleitung 3 ist nach einer abströmseitig auf das Differenzdruckventil 5 folgenden Verzweigung an die Saugventile 14 der Pumpenelemente 11 angeschlossen. Von den Druckventilen 15 der Pumpenelemente 11 gehen Leitungszweige einer Kraftstoffhochdruckleitung 18 aus, welche zu einem nicht dargestellten Kraftstoffhochdruckspeicher des Kraftstoffeinspritzsystems führt. Die Niederdruckpumpe 1 und die Hochdruckpumpe 10 der Pumpenanordnung sind jeweils durch nicht dargestellte Druckbegrenzungsventile vor Überlastung geschützt .The pump arrangement also includes a high-pressure pump 10 with three pump elements 11. These each have a pump piston 12 and a suction valve 14 and pressure valve 15 connected to a displacement chamber 13 of the pump element 11. The pump pistons 12, which are supported by spring force on a cam ring 16, can be driven by an eccentric shaft 17, which, like the low-pressure pump 1, is coupled to the internal combustion engine (not shown). The delivery line 3 is connected to the suction valves 14 of the pump elements 11 after a branch following the outflow side of the differential pressure valve 5. Line branches of a high-pressure fuel line 18 extend from the pressure valves 15 of the pump elements 11 and lead to a high-pressure fuel reservoir (not shown) of the fuel injection system. The low-pressure pump 1 and the high-pressure pump 10 of the pump arrangement are each protected against overload by pressure relief valves, not shown.
Der von der Niederdruckpumpe 1 aus dem Kraftstoffbehälter 2 angesaugte Kraftstoff wird von dem alsThe fuel drawn from the fuel tank 2 by the low-pressure pump 1 is used by the
Proportionalmagnetventil ausgebildeten Stromregelventil 4 mengenmäßig bemessen und durch das geöffnete Differenzdruckventil 5 an die Hochdruckpumpe 10 abgegeben. Diese hebt den Druck des geförderten Kraftstoffes auf ein relativ hohes Druckniveau an und gibt diesen durch die Kraftstoffhochdruckleitung 18 in den KraftstoffSpeicher ab, an den Kraftstoffinjektoren der Brennkraftmaschine angeschlossen sind. Ein geringer Teil des Förderstroms der Niederdruckpumpe 1 gelangt nach dem Stromregelventil 4 durch die gedrosselte Rücklaufleitung 6 zurück in den Kraftstoffbehälter 2. Die vom Kraftstoffbedarf der Brennkraftmaschine abhängige Förderung der Hochdruckpumpe 10 wird als mit dem Stromregelventil 4 eingestellte Mengenregelung durch Saugdrosselung bezeichnet.Proportional solenoid valve designed flow control valve 4 dimensioned and delivered through the open differential pressure valve 5 to the high pressure pump 10. This raises the pressure of the fuel delivered to a relatively high pressure level and passes it through High-pressure fuel line 18 into the fuel accumulator, to which fuel injectors of the internal combustion engine are connected. After the flow control valve 4, a small part of the delivery flow of the low-pressure pump 1 passes through the throttled return line 6 back into the fuel tank 2.
Von der Bauart her sind die Niederdruckpumpe 1 und die Hochdruckpumpe 10 Konstantpumpen.In terms of type, the low-pressure pump 1 and the high-pressure pump 10 are constant pumps.
Die Saugventile 14 der Pumpenelemente 11 der Hochdruckpumpe 10 sind, wie schematisch vereinfacht dargestellt, als unbelastetes Rückschlagventil ausgebildet. Abweichend von der Darstellung können die Saugventile 14 auch als federbelastete Rückschlagventile ausgebildet sein. Erfindungswesentlich ist jedoch, daß die Saugventile 14 auf einen sehr niedrigen Öffnungsdruck eingestellt sind. Demgegenüber hat das Differenzdruckventil 5 in der Förderleitung 3 einen Öffnungsdruck, der größer ist als derjenige der Saugventile 14. Das stromaufwärts des Differenzdruckventils 5 in der Förderleitung 3 angeordnete Stromregelventil 4 ist in Schieberbauart ausgeführt und hat demzufolge in seiner Schließstellung einen Kraftstoff- Leckstrom, welcher nach dem Stromregelventil in die gedrosselte Rücklaufleitung 6 abgeleitet wird, ohne das Differenzdruckventil in seine Durchlaßstellung zu schalten.The suction valves 14 of the pump elements 11 of the high-pressure pump 10 are, as shown schematically in simplified form, as an unloaded check valve. Deviating from the illustration, the suction valves 14 can also be designed as spring-loaded check valves. It is essential to the invention that the suction valves 14 are set to a very low opening pressure. In contrast, the differential pressure valve 5 in the delivery line 3 has an opening pressure which is greater than that of the suction valves 14. The flow control valve 4 arranged upstream of the differential pressure valve 5 in the delivery line 3 is designed as a slide valve and consequently has a fuel leakage flow in its closed position, which follows the flow control valve in the throttled return line 6 is derived without switching the differential pressure valve to its open position.
In der Sperrstellung des Stromregelventils 4 wird daher mittels des Differenzdruckventils 5 sichergestellt, daß die Pumpenelemente 11 keinen Kraftstoff ansaugen können und die Hochdruckpumpe 10 im Betriebszustand „Null-Förderung" arbeitet. Für einen Betriebszustand „Teil-Förderung" wird mittels des Stromregelventils 4 ein Kraftstoff-Förderstrom eingestellt, dessen Druck das Differenzdruckventil 5 umschaltet, so daß die Pumpenelemente 11 Kraftstoff ansaugen und in die Kraftstoffhochdruckleitung 18 abgeben können. Dabei ist durch den niedrigen Öffnungsdruck der Saugventile 14 eine gleichmäßige Füllung der Pumpenelemente 11 erzielt. Mit der Gleichförderung der Pumpenelemente 11 werden Druckschwankungen im Kraftstoffhochdruckbehälter weitgehend vermieden. In the locked position of the flow control valve 4, it is therefore ensured by means of the differential pressure valve 5 that the pump elements 11 cannot draw in fuel and the high pressure pump 10 operates in the “zero delivery” operating state by means of the flow control valve 4, a fuel delivery flow is set, the pressure of which switches the differential pressure valve 5, so that the pump elements 11 can suck in fuel and discharge it into the high-pressure fuel line 18. The low opening pressure of the suction valves 14 results in a uniform filling of the pump elements 11. With equal delivery of the pump elements 11, pressure fluctuations in the high-pressure fuel tank are largely avoided.

Claims

Ansprüche Expectations
1. Pumpenanordnung zur Kraftstoffhochdruckerzeugung für ein in Brennkraftmaschinen eingesetztes1. Pump arrangement for high-pressure fuel generation for one used in internal combustion engines
Kraftstoffeinspritzsystem, insbesondere Common-Rail- Einspritzsystem, mit einer Kraftstoff aus einem Kraftstoffbehälter (2) ansaugenden Niederdruckpumpe (1) , einer Hochdruckpumpe (10) mit mehreren Pumpenelementen (11) , einer von der Niederdruckpumpe (1) zu der Hochdruckpumpe (10) führenden Förderleitung (3) , an welche ein SaugventilFuel injection system, in particular common rail injection system, with a low-pressure pump (1) drawing fuel from a fuel tank (2), a high-pressure pump (10) with a plurality of pump elements (11), one leading from the low-pressure pump (1) to the high-pressure pump (10) Delivery line (3) to which a suction valve
(14) des jeweiligen Pumpenelements (11) angeschlossen ist, einem Stromregelventil (4) in Schieberbauart in der(14) of the respective pump element (11) is connected, a flow control valve (4) in the slide type in the
Förderleitung (3) , sowie mit einer ausgangsseitig des Stromregelventils (4) angeschlossenen Rücklaufleitung (6) , dadurch gekennzeichnet, daß die Rücklaufleitung (6) zwischen dem StromregelventilDelivery line (3), as well as with a return line (6) connected on the output side of the flow control valve (4), characterized in that the return line (6) is between the flow control valve
(4) und der Hochdruckpumpe (10) an die Förderleitung (3) angeschlossen ist und daß in der Förderleitung (3) zwischen dem Anschluß der(4) and the high pressure pump (10) is connected to the delivery line (3) and that in the delivery line (3) between the connection of the
Rücklaufleitung (6) und den Saugventilen (14) derReturn line (6) and the suction valves (14) of the
Hochdruckpumpe (10) ein Differenzdruckventil (5) angeordnet ist, dessen Öffnungsdruck größer ist als derjenige derHigh pressure pump (10) a differential pressure valve (5) is arranged, the opening pressure is greater than that of
Saugventile (14) . Suction valves (14).
2. Pumpenanordnung nach Anspruch 1, dadurch gekennzeichnet, daß das Saugventil (14) der Pumpenelemente (11) ein unbelastetes oder ein federbelastetes Rückschlagventil ist. 2. Pump arrangement according to claim 1, characterized in that the suction valve (14) of the pump elements (11) is an unloaded or a spring-loaded check valve.
EP99936424A 1998-10-07 1999-06-08 Pump arrangement for providing fuel at high pressure Expired - Lifetime EP1119704B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19846157 1998-10-07
DE19846157A DE19846157A1 (en) 1998-10-07 1998-10-07 Pump arrangement for high-pressure fuel generation
PCT/DE1999/001664 WO2000020753A1 (en) 1998-10-07 1999-06-08 Pump arrangement for providing fuel at high pressure

Publications (2)

Publication Number Publication Date
EP1119704A1 true EP1119704A1 (en) 2001-08-01
EP1119704B1 EP1119704B1 (en) 2002-12-18

Family

ID=7883677

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99936424A Expired - Lifetime EP1119704B1 (en) 1998-10-07 1999-06-08 Pump arrangement for providing fuel at high pressure

Country Status (5)

Country Link
US (1) US6581577B1 (en)
EP (1) EP1119704B1 (en)
JP (1) JP2002526716A (en)
DE (2) DE19846157A1 (en)
WO (1) WO2000020753A1 (en)

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DE19846157A1 (en) 2000-04-13
US6581577B1 (en) 2003-06-24
JP2002526716A (en) 2002-08-20
WO2000020753A1 (en) 2000-04-13
EP1119704B1 (en) 2002-12-18
DE59903863D1 (en) 2003-01-30

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