EP1091115B1 - Fuel supply system and method of operating this system - Google Patents

Fuel supply system and method of operating this system Download PDF

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Publication number
EP1091115B1
EP1091115B1 EP00119392A EP00119392A EP1091115B1 EP 1091115 B1 EP1091115 B1 EP 1091115B1 EP 00119392 A EP00119392 A EP 00119392A EP 00119392 A EP00119392 A EP 00119392A EP 1091115 B1 EP1091115 B1 EP 1091115B1
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EP
European Patent Office
Prior art keywords
fuel
pump
combustion engine
internal combustion
auxiliary pump
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Expired - Lifetime
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EP00119392A
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German (de)
French (fr)
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EP1091115A2 (en
EP1091115A3 (en
Inventor
Rolf Dr. Bosse
Thomas Lang
Henning Meyer
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Volkswagen AG
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Volkswagen AG
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Publication of EP1091115A2 publication Critical patent/EP1091115A2/en
Publication of EP1091115A3 publication Critical patent/EP1091115A3/en
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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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven

Definitions

  • the invention relates to a fuel system for an internal combustion engine of a Motor vehicle with the features mentioned in the preamble of claim 1 and a Method for operating the fuel system with the mentioned in the preamble of claim 7 Features.
  • Fuel delivery systems have at least one fuel pump, which via a Pressure line system from a tank fuel to the internal combustion engine promotes.
  • a pressure regulator is assigned to the fuel pump or integrated into it.
  • a disadvantage of such Kraftstofditionanlagen is that the fuel pump for a very large operating range must be designed in terms of their capacity.
  • the flow rate of such Fuel pump will be insufficient. For example, the starting phase of the Internal combustion engine due to air bubbles in the fuel due to insufficient low flow rate are interrupted.
  • EP 0819458 B1 is a fuel supply device for diesel engines with a Fuel filter, a fuel tank and a high-pressure Einspritrpumpe shown.
  • an inlet line is provided which comprises an additional pump and the Fuel tank connects to the inlet channel of the fuel filter.
  • the high pressure injection pump is supplied with fuel via the outlet channel of the fuel filter and conducts the fuel to the injection line.
  • a fuel return line is shown above which derived from the high-pressure injection pump excess fuel derived becomes.
  • the Pressure of the fuel when entering the high-pressure injection pump in a fixed Area lie. If the fuel pressure in the outlet channel is too high, the fuel over the Bypass line removed and not supplied to the high-pressure injection pump.
  • the invention has for its object to provide a fuel system for a Internal combustion engine of a motor vehicle and a method for operating the Provide fuel system, so that the supply of Internal combustion engine with fuel in all operating phases of the Internal combustion engine is ensured.
  • the fuel system according to the invention for an internal combustion engine of a Motor vehicle has in a pressure line system, an electric auxiliary pump and a Check valve on, parallel to each other and in the flow direction to the fuel pump are arranged, wherein the electric auxiliary pump in a bypass of the Pressure line system between the tank and the fuel pump is located.
  • the electric auxiliary pump and the check valve the fuel from the tank in the flow direction Promote fuel pump.
  • a delivery rate of the fuel pump is detected in a control unit and set depending on a delivery rate of the electric auxiliary pump. Furthermore, it is envisaged that when not switched on electrical auxiliary pump the Promotion of the fuel is carried out exclusively via the check valve.
  • control unit is designed such that based on the speed of the Internal combustion engine a target injection quantity detectable and depending on the Delivery of the fuel pump and / or the electric auxiliary pump is adjustable.
  • the delivery rate of the additional pump in the start phase or also in to increase the acceleration phases of the internal combustion engine So that can Overall, the fuel pump can be made smaller.
  • a fuel pump 12 which via a Pressure line system 14 is connected to a tank 16.
  • suitable adjusting means for the Fuel pump 12, such as a pressure regulator has been omitted.
  • an additional pump 18 is integrated, which is in a bypass 20 of the Pressure line system 14 is housed and parallel to a check valve 22 is located. in the turned off state, the auxiliary pump 18 blocks the bypass 20, and the promotion can only be done by the check valve 22. A reflux of the fuel over the bypass 20 is thus prevented.
  • the fuel pump 12 and the auxiliary pump 18 is associated with a control unit 24, via suitable data lines directly or via known adjusting means with the Booster pump 18 and the fuel pump 12 is connected.
  • the controller 24 may be a Delivery of the fuel pump 12 are detected and the auxiliary pump 18 in dependence be regulated by it.
  • the auxiliary pump 18 are connected to a sufficient To ensure fuel flow to the internal combustion engine. After the start of the Internal combustion engine, for example, when reaching a predetermined speed of Internal combustion engine, the auxiliary pump 18 can be switched off again. It is but advantageous, the auxiliary pump 18 in the acceleration phases of the motor vehicle zuzupar to increase the overall delivery capacity of the fuel delivery system 10 and thus allowing a small design of the fuel pump 12.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

The fuel delivery system is designed, so that between the tank (16) and the fuel pump (12) an electric auxiliary pump (18) is positioned, which is arranged parallel to a non-return valve (22) in a Bypass line (20) of the pressure line system (14). The auxiliary pump and the fuel pump is assigned a control unit (24), across which a regulation of the conveying power of the auxiliary pump, results depending on a conveying power of the fuel pump.

Description

Die Erfindung betrifft eine Kraftstoffanlage für eine Verbrennungskraftmaschine eines Kraftfahrzeuges mit den im Oberbegriff des Anspruchs 1 genannten Merkmalen und ein Verfahren zum Betrieb der Kraftstoffanlage mit den im Oberbegriff des Anspruchs 7 genannten Merkmalen.The invention relates to a fuel system for an internal combustion engine of a Motor vehicle with the features mentioned in the preamble of claim 1 and a Method for operating the fuel system with the mentioned in the preamble of claim 7 Features.

Kraftstoffförderanlagen weisen zumindest eine Kraftstoffpumpe auf, die über ein Druckleitungssystem aus einem Tank Kraftstoff zur Verbrennungskraftmaschine fördert. Dabei wird im allgemeinen ein Druckregler der Kraftstoffpumpe zugeordnet oder in diese integriert. Nachteilig an derartigen Kraftstofförderanlagen ist, dass die Kraftstoffpumpe für einen sehr großen Betriebsbereich hinsichtlich ihrer Förderleistung ausgelegt sein muss. In bestimmten Betriebsphasen der Verbrennungskraftmaschine kann jedoch die Förderleistung einer solchen Kraftstoffpumpe nicht ausreichend sein. So kann beispielsweise die Startphase der Verbrennungskraftmaschine durch Lufteinschlüsse im Kraftstoff infolge einer unzureichend niedrigen Förderleistung unterbrochen werden.Fuel delivery systems have at least one fuel pump, which via a Pressure line system from a tank fuel to the internal combustion engine promotes. there In general, a pressure regulator is assigned to the fuel pump or integrated into it. A disadvantage of such Kraftstofförderanlagen is that the fuel pump for a very large operating range must be designed in terms of their capacity. In particular Operating phases of the internal combustion engine, however, the flow rate of such Fuel pump will be insufficient. For example, the starting phase of the Internal combustion engine due to air bubbles in the fuel due to insufficient low flow rate are interrupted.

In der EP 0819458 B1 ist eine Kraftstoffzufuhrvorrichtung für Dieselmotoren mit einem Kraftstofffilter, einen Kraftstofftank und einer Hochdruck-Einspritrpumpe dargestellt. Des Weiteren ist eine Einlassleitung vorgesehen, die eine Zusatzpumpe umfasst und den Kraftstofftank mit dem Eintrittskanal des Kraftstofffilters verbindet. Die Hochdruck-Einspritzpumpe wird über den Austrittskanal des Kraftstofffilters mit Kraftstoff versorgt und leitet den Kraftstoff an die Einspritzleitung. Femer ist eine Kraftstoffrückfuhrleitung gezeigt, über welche von der Hochdruck-Einspritzpumpe kommender überschüssiger Kraftstoff abgeleitet wird. Um die Funktionsfähigkeit der Hochdruck-Einspritzpumpe zu gewährleisten, muss der Druck des Kraftstoffes beim Eintritt in die Hochdruck- Einspritzpumpe in einem festgelegten Bereich liegen. Ist der Kraftstoffdruck im Austrittskanal zu hoch, wird der Kraftstoff über die Umgehungsleitung abgeführt und nicht der Hochdruck-Einspritzpumpe zugeleitet.In EP 0819458 B1 is a fuel supply device for diesel engines with a Fuel filter, a fuel tank and a high-pressure Einspritrpumpe shown. Of Furthermore, an inlet line is provided which comprises an additional pump and the Fuel tank connects to the inlet channel of the fuel filter. The high pressure injection pump is supplied with fuel via the outlet channel of the fuel filter and conducts the fuel to the injection line. Furthermore, a fuel return line is shown above which derived from the high-pressure injection pump excess fuel derived becomes. To ensure the functionality of the high pressure injection pump, the Pressure of the fuel when entering the high-pressure injection pump in a fixed Area lie. If the fuel pressure in the outlet channel is too high, the fuel over the Bypass line removed and not supplied to the high-pressure injection pump.

In der US 5878718 ist eine Kraftstoffversorgungsanlage und ein Verfahren zum Betreiben einer Brennkraftmaschine beschrieben, wobei die Kraftstoffversorgungsantage einen Kraftstoffvorratsbehälter, eine erste und eine zweite Kraftstoffpumpe und mindestens ein Kraftstoffventil, über das der Kraftstoff in den Brennraum der Brennkraftmaschine gelangt, aufweist. Die beiden Kraftstoffpumpen sind in Reihe hintereinander geschaltet. Es soll das Problem gelöst werden, dass sich bei inaktiver Brennkraftmaschine in der Kraftstoffverbindungsleitung zwischen der ersten und der zweiten Kraftstoffpumpe bzw. zwischen der zweiten Kraftstoffpumpe und dem mindestens einen Kraftstoffventil Dampfblasen bilden, die lange Anlasszeiten zum Starten der Brennkraftmaschine zur Folge haben. Zur Lösung dieses Problems wird in der US 5878718 vorgeschlagen, die gesamte Kraftstoffmenge mittels der ersten Kraftstoffpumpe in die Leitung in Richtung der zweiten Kraftstoffpumpe zu fördern, ohne das Kraftstoff über die Ausgleichsleitung zurück in den Kraftstoffvorratsbehälter fließen kann. Parallel zur zweiten Kraftstoffpumpe ist eine Durchlasseinrichtung vorgesehen, über welche der von der ersten Kraftstoffpumpe geförderte Kraftstoff in die Druckleitung für das zumindest eine Kraftstoffventil gelangt. Das Druckventil wird derart angesteuert, dass der von der ersten Kraftstoffpumpe geförderte, überschüssige Kraftstoff zurück in den Kraftstoffvorratsbehälter gelangt, nachdem die Dampfblasen komprimiert wurden.In US 5878718 a fuel supply system and a method for operating a Internal combustion engine described, wherein the Kraftstoffversorgungsantage a Fuel tank, a first and a second fuel pump and at least one Fuel valve, via which the fuel enters the combustion chamber of the internal combustion engine, having. The two fuel pumps are connected in series in series. It should be that Problem to be solved that in inactive internal combustion engine in the Fuel line between the first and the second fuel pump or Steam bubbles between the second fuel pump and the at least one fuel valve form, which have long start times for starting the internal combustion engine result. to Solution to this problem is proposed in US 5878718, the total amount of fuel by means of the first fuel pump in the line in the direction of the second fuel pump Feed, without the fuel over the equalization line back into the fuel tank can flow. Parallel to the second fuel pump, a passage means is provided, via which of the fuel pumped by the first fuel pump in the pressure line for the at least one fuel valve passes. The pressure valve is controlled such that the of The first fuel pump delivered, excess fuel back into the Fuel tank passes after the vapor bubbles have been compressed.

Der Erfindung liegt die Aufgabe zugrunde, eine Kraftstoffanlage für eine Verbrennungskraftmaschine eines Kraftfahrzeuges und ein Verfahren zum Betrieb der Kraftstoffanlage zur Verfügung zu stellen, so dass die Versorgung der Verbrennungskraftmaschine mit Kraftstoff in allen Betriebsphasen der Verbrennungskraftmaschine sichergestellt ist.The invention has for its object to provide a fuel system for a Internal combustion engine of a motor vehicle and a method for operating the Provide fuel system, so that the supply of Internal combustion engine with fuel in all operating phases of the Internal combustion engine is ensured.

Diese Aufgabe wird durch die in den unabhängigen Ansprüchen angegebenen Merkmale gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved by the features specified in the independent claims solved. Advantageous developments of the invention are specified in the subclaims.

Die erfindungsgemäße Kraftstoffanlage für eine Verbrennungskraftmaschine eines Kraftfahrzeuges weist in einem Druckleitungssystem eine elektrische Zusatzpumpe und ein Rückschlagventil auf, die parallel zueinander und in Strömungsrichtung zur Kraftstoffpumpe angeordnet sind, wobei die elektrische Zusatzpumpe in einem Bypass des Druckleitungssystems zwischen dem Tank und der Kraftstoffpumpe liegt.The fuel system according to the invention for an internal combustion engine of a Motor vehicle has in a pressure line system, an electric auxiliary pump and a Check valve on, parallel to each other and in the flow direction to the fuel pump are arranged, wherein the electric auxiliary pump in a bypass of the Pressure line system between the tank and the fuel pump is located.

Dadurch, dass sich zwischen dem Tank und der Kraftstoffpumpe eine elektrische Zusatzpumpe befindet, die parallel zu dem Rückschlagventil angeordnet ist, kann die Förderleistung der Kraftstoffpumpe unterstützt werden.Characterized in that between the tank and the fuel pump, an electric auxiliary pump located parallel to the check valve, the flow rate of the Supported fuel pump.

Nach dem erfindungsgemäßen Verfahren ist es vorgesehen, dass die elektrische Zusatzpumpe und das Rückschlagventil den Kraftstoff aus dem Tank in Strömungsrichtung zur Kraftstoffpumpe fördern.According to the inventive method, it is provided that the electric auxiliary pump and the check valve, the fuel from the tank in the flow direction Promote fuel pump.

Vorteilhafterweise wird eine Förderleistung der Kraftstoffpumpe in einem Steuergerät erfasst und in Abhängigkeit davon eine Förderleistung der elektrischen Zusatzpumpe eingestellt. Femer ist es vorgesehen, dass bei nicht zugeschalteter elektrischer Zusatzpumpe die Förderung des Kraftstoffes ausschließlich über das Rückschlagventil erfolgt.Advantageously, a delivery rate of the fuel pump is detected in a control unit and set depending on a delivery rate of the electric auxiliary pump. Furthermore, it is envisaged that when not switched on electrical auxiliary pump the Promotion of the fuel is carried out exclusively via the check valve.

Vorteilhafterweise ist das Steuergerät derart ausgebildet, dass anhand der Drehzahl der Verbrennungskraftmaschine eine Solleinspritzmenge feststellbar und abhängig davon die Förderleistung der Kraftstoffpumpe und/oder der elektrischen Zusatzpumpe einstellbar ist.Advantageously, the control unit is designed such that based on the speed of the Internal combustion engine a target injection quantity detectable and depending on the Delivery of the fuel pump and / or the electric auxiliary pump is adjustable.

Besonders vorteilhaft ist es, die Förderleistung der Zusatzpumpe in der Startphase oder auch in den Beschleunigungsphasen der Verbrennungskraftmaschine zu erhöhen. Damit kann insgesamt die Kraftstoffpumpe kleiner ausgelegt werden.It is particularly advantageous for the delivery rate of the additional pump in the start phase or also in to increase the acceleration phases of the internal combustion engine. So that can Overall, the fuel pump can be made smaller.

Die Erfindung wird nachfolgend in einem Ausführungsbeispiel anhand der zugehörigen Zeichnung, die eine erfindungsgemäße Kraftstofförderanlage zeigt, näher erläutert.The invention will be described below in an embodiment with reference to the associated Drawing showing a Kraftstofförderanlage invention, explained in more detail.

Die Kraftstofförderanlage 10 beinhaltet eine Kraftstoffpumpe 12, die über ein Druckleitungssystem 14 mit einem Tank 16 verbunden ist. Aus Gründen der Übersichtlichkeit ist auf die Darstellung der Verbrennungskraftmaschine und geeigneter Stellmittel für die Kraftstoffpumpe 12, wie beispielsweise einen Druckregler, verzichtet worden.The Kraftstofförderanlage 10 includes a fuel pump 12, which via a Pressure line system 14 is connected to a tank 16. For the sake of clarity on the representation of the internal combustion engine and suitable adjusting means for the Fuel pump 12, such as a pressure regulator has been omitted.

In das Druckleitungssystem 14 ist eine Zusatzpumpe 18 integriert, die in einem Bypass 20 des Druckleitungssystems 14 untergebracht ist und parallel zu einem Rückschlagventil 22 liegt. Im ausgeschalteten Zustand blockiert die Zusatzpumpe 18 den Bypass 20, und die Förderung kann ausschließlich durch das Rückschlagventil 22 erfolgen. Ein Rückfluß des Kraftstoffs über den Bypass 20 ist somit verhindert.In the pressure line system 14, an additional pump 18 is integrated, which is in a bypass 20 of the Pressure line system 14 is housed and parallel to a check valve 22 is located. in the turned off state, the auxiliary pump 18 blocks the bypass 20, and the promotion can only be done by the check valve 22. A reflux of the fuel over the bypass 20 is thus prevented.

Weiterhin ist der Kraftstoffpumpe 12 und der Zusatzpumpe 18 ein Steuergerät 24 zugeordnet, das über geeignete Datenleitungen direkt oder auch über bekannte Stellmittel mit der Zusatzpumpe 18 und der Kraftstoffpumpe 12 verbunden ist. Über das Steuergerät 24 kann eine Förderleistung der Kraftstoffpumpe 12 erfaßt werden und die Zusatzpumpe 18 in Abhängigkeit davon geregelt werden.Furthermore, the fuel pump 12 and the auxiliary pump 18 is associated with a control unit 24, via suitable data lines directly or via known adjusting means with the Booster pump 18 and the fuel pump 12 is connected. About the controller 24 may be a Delivery of the fuel pump 12 are detected and the auxiliary pump 18 in dependence be regulated by it.

Befindet sich die Verbrennungskraftmaschine in einer Startphase, so kann mittels des Steuergerätes 24 die Zusatzpumpe 18 zugeschaltet werden, um einen ausreichenden Kraftstoffstrom zur Verbrennungskraftmaschine zu gewährleisten. Nach dem Start der Verbrennungskraftmaschine, beispielsweise mit Erreichen einer vorgegebenen Drehzahl der Verbrennungskraftmaschine, kann die Zusatzpumpe 18 wieder abgeschaltet werden. Es ist jedoch vorteilhaft, die Zusatzpumpe 18 in den Beschleunigungsphasen des Kraftfahrzeuges zuzuschalten, um insgesamt die Förderleistung der Kraftstofförderanlage 10 zu erhöhen und damit eine kleine Auslegung der Kraftstoffpumpe 12 zu ermöglichen.If the internal combustion engine is in a starting phase, then by means of the Control unit 24, the auxiliary pump 18 are connected to a sufficient To ensure fuel flow to the internal combustion engine. After the start of the Internal combustion engine, for example, when reaching a predetermined speed of Internal combustion engine, the auxiliary pump 18 can be switched off again. It is but advantageous, the auxiliary pump 18 in the acceleration phases of the motor vehicle zuzuschalten to increase the overall delivery capacity of the fuel delivery system 10 and thus allowing a small design of the fuel pump 12.

Denkbar ist auch, bei sehr niedrigen Drehzahlen, beispielsweise im Leerlauf der Verbrennungskraftmaschine, die Kraftstoffpumpe 12 abzuschalten und die Förderung nur über die Zusatzpumpe 18 zu betreiben. Da die Kraftstoffpumpe 12 zur Förderung wesentlich höherer Volumina ausgelegt ist, als dies in den Leerlaufphasen der Verbrennungskraftmaschine notwendig ist, besteht für die Förderung über die Kraftstoffpumpe 12 in einem solchen Fall ein ungünstiger Wirkungsgrad.It is also conceivable, at very low speeds, for example, at idle the Internal combustion engine, the fuel pump 12 to turn off and the promotion only about to operate the auxiliary pump 18. As the fuel pump 12 to promote much higher Volumes is designed as this in the idling phases of the internal combustion engine is necessary exists for the promotion via the fuel pump 12 in such a case unfavorable efficiency.

Claims (13)

  1. Fuel system for an internal combustion engine of a motor vehicle, having a tank (16) and a fuel delivery system (10) which comprises a fuel pump (12) for delivering fuel from the tank (16) to the internal combustion engine via a pressure line system (14), an electric auxiliary pump (18) and a non-return valve (22) being arranged parallel to one another in the pressure line system (14) and the electric auxiliary pump (18) being located in a bypass of the pressure line system (14) between the tank (16) and the fuel pump (12), characterized in that the electric auxiliary pump (18) and the non-return valve (22) are arranged in the flow direction to the fuel pump (12).
  2. Fuel system according to Claim 1, characterized in that, when the electric auxiliary pump (18) is not switched on, the fuel is delivered to the fuel pump (12) exclusively via the non-return valve (22).
  3. Fuel system according to Claim 1 or 2, characterized in that the electric auxiliary pump (18) and the fuel pump (12) are assigned a control unit (24) by means of which a delivery rate of the electric auxiliary pump (18) is regulated as a function of a delivery rate of the fuel pump (12).
  4. Fuel system according to Claim 3, characterized in that the control unit (24) is designed in such a way that a desired injection quantity can be determined from the rotational speed of the internal combustion engine and, as a function thereof, the delivery rate of the fuel pump (12) and/or the electric auxiliary pump (18) can be adjusted.
  5. Fuel system according to Claim 3 or 4, characterized in that the control unit (24) is designed in such a way that the delivery rate of the electric auxiliary pump (18) can be increased in a starting phase and/or an acceleration phase of the internal combustion engine.
  6. Fuel system according to Claim 3 or 4, characterized in that the control unit (24) is designed in such a way that, in an idling phase of the internal combustion engine, the delivery takes place exclusively via the electric auxiliary pump (18).
  7. Method of operating a fuel system for an internal combustion engine of a motor vehicle, having a tank (16) and a fuel delivery system (10) which delivers fuel from the tank (16) to the internal combustion engine by means of a fuel pump (12) via a pressure line system (14), an electric auxiliary pump (18) and a non-return valve (22) being arranged parallel to one another in the pressure line system (14) and the electric auxiliary pump (18) being located in a bypass of the pressure line system (14) between the tank (16) and the fuel pump (12), characterized in that the electric auxiliary pump (18) and the non-return valve (22) deliver the fuel from the tank (16) in the flow direction to the fuel pump (12).
  8. Method according to Claim 7, characterized in that a delivery rate of the fuel pump (12) is detected in a control unit and, as a function thereof, a delivery rate of the electric auxiliary pump (18) is adjusted.
  9. Method according to Claim 8, characterized in that, when the electric auxiliary pump (18) is not switched on, the fuel is delivered to the fuel pump (12) exclusively via the non-return valve (32).
  10. Method according to Claim 8 or 9, characterized in that the delivery rate of the fuel pump (12) is estimated from a rotational speed of the internal combustion engine and a desired injection quantity is derived therefrom.
  11. Method according to one of Claims 7 to 10, characterized in that the delivery rate of the auxiliary pump (18) is increased in a starting phase of the internal combustion engine.
  12. Method according to one of Claims 7 to 10, characterized in that the delivery rate of the auxiliary pump (18) is increased in an acceleration phase of the internal combustion engine.
  13. Method according to one of Claims 7 to 10, characterized in that the delivery takes place via the auxiliary pump (18) in an idling phase of the internal combustion engine.
EP00119392A 1999-10-07 2000-09-12 Fuel supply system and method of operating this system Expired - Lifetime EP1091115B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19948149 1999-10-07
DE19948149A DE19948149A1 (en) 1999-10-07 1999-10-07 Fuel delivery system and method for operating the fuel delivery system

Publications (3)

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EP1091115A2 EP1091115A2 (en) 2001-04-11
EP1091115A3 EP1091115A3 (en) 2001-12-05
EP1091115B1 true EP1091115B1 (en) 2005-08-17

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EP00119392A Expired - Lifetime EP1091115B1 (en) 1999-10-07 2000-09-12 Fuel supply system and method of operating this system

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AT (1) ATE302342T1 (en)
DE (2) DE19948149A1 (en)

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DE10360091A1 (en) * 2003-12-20 2005-07-21 Deutz Ag Reciprocating piston engine has fuel feed system with separate auxiliary pump with electric drive, and parallel bypass with back pressure valve

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ATE302342T1 (en) 2005-09-15
DE50010959D1 (en) 2005-09-22
EP1091115A2 (en) 2001-04-11
EP1091115A3 (en) 2001-12-05
DE19948149A1 (en) 2001-04-12

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