EP3014099B1 - Fuel delivery system with partial pressure reduction valve in supply line of jet pump - Google Patents

Fuel delivery system with partial pressure reduction valve in supply line of jet pump Download PDF

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Publication number
EP3014099B1
EP3014099B1 EP14723827.3A EP14723827A EP3014099B1 EP 3014099 B1 EP3014099 B1 EP 3014099B1 EP 14723827 A EP14723827 A EP 14723827A EP 3014099 B1 EP3014099 B1 EP 3014099B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
delivery system
filter
valve
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.)
Not-in-force
Application number
EP14723827.3A
Other languages
German (de)
French (fr)
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EP3014099A1 (en
Inventor
Martin Beyer
Hans-Peter Braun
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
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Robert Bosch GmbH
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Publication date
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Publication of EP3014099A1 publication Critical patent/EP3014099A1/en
Application granted granted Critical
Publication of EP3014099B1 publication Critical patent/EP3014099B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F02M37/025—Feeding by means of a liquid fuel-driven jet pump
    • 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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • 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
    • F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank
    • 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
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F02M37/106—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank
    • 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
    • F02M37/44—Filters structurally associated with 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
    • F02M37/22—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
    • F02M37/46—Filters structurally associated with 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
    • F02M37/22—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
    • F02M37/50—Filters arranged in or on fuel tanks

Definitions

  • a fuel delivery system may be disposed in a fuel tank of a motor vehicle and may be used to supply an internal combustion engine with fuel.
  • the fuel delivery system may have a fuel filter to purify the fuel of undesirable particles before being supplied to the internal combustion engine.
  • the fuel in the fuel tank and in particular in the fuel filter can outgas. When restarting, this can lead to higher pressure build-up times in the fuel filter, since first the gases must be compressed and liquefied.
  • fuel filters can be kept under pressure under standby conditions, in particular under system pressure. However, this leads to a life-time stress on the fuel filter.
  • the EP 1 126 157 A2 discloses such a fuel supply device.
  • the WO 2006/079 402 A1 proposes to maintain a lower pressure throughout the system via a second pressure valve in the Abstellfall.
  • the WO 2008/052 873 A1 describes the problem that the filter is heavily loaded in the Abstellfall and also proposes to reduce the pressure throughout the system.
  • a fuel delivery system includes a fuel filter that cleans or filters a fuel delivered from a storage pot to an internal combustion engine. Furthermore, the fuel delivery system has a suction jet pump (SSP) for filling the storage tank with fuel from a fuel tank.
  • the fuel filter is hydraulically connected via a tether with the suction jet pump.
  • a first pressure valve is provided which opens automatically in the direction of the suction jet pump when a pressure in the fuel filter exceeds a first threshold.
  • the idea of the invention is based on integrating a pressure valve with a defined opening pressure into a feed of the ejector pump.
  • the opening pressure is between a vapor pressure of the fuel and the system pressure. That is, the opening pressure of the first pressure valve may be selected at the pressure limit for outgassing of the fuel.
  • a subsystem pressure is applied to the fuel filter.
  • the fuel delivery system cost-effective filter housing such as polyoxymethylene (POM)
  • POM polyoxymethylene
  • the overflow of the fuel can be used to feed the ejector. That is, the first pressure valve can pass during operation of the internal combustion engine or the fuel delivery system funded by a fuel pump to the reservoir cup and not required by the internal combustion engine amount of fuel as a flow in the haulage. In this way, the overflow can be used to power the ejector. This in turn allows a higher efficiency of the fuel delivery system compared to previous solutions in which the spill freely flows, i. e.g. was returned to the fuel tank.
  • the fuel delivery system may for example be used in a fuel tank of a motor vehicle.
  • the motor vehicle may be, for example, a motor vehicle with an internal combustion engine, such as an internal combustion engine.
  • the motor vehicle may have an electric drive and be designed as a hybrid vehicle.
  • the fuel delivery system may be arranged in a storage tank or reservoir provided in the fuel tank.
  • the storage pot is arranged as close as possible to the bottom of the fuel tank.
  • an electric fuel pump EKP
  • EKP electric fuel pump
  • the fuel filter can be designed as a fine filter or lifetime filter.
  • the fuel filter is designed to clean the fuel that is passed from the fuel tank or from the storage pot to the internal combustion engine or to the internal combustion engine, from unwanted particles.
  • the fuel filter and in particular the filter housing can be designed to be used at a system pressure of 7 to 8 bar.
  • the fuel can be pumped from the fuel tank into the interior of the storage pot via a suction line of the suction jet pump.
  • the fuel can be pumped out of the storage pot by a fuel pump, in particular an electric fuel pump, to the filter and then through a supply line to an injection system of the internal combustion engine.
  • the suction jet pump can be arranged on the storage pot and designed as a horizontal or vertical suction jet pump. Due to the tethering of the suction jet pump fuel is delivered directly from the fuel filter to a suction line. At the connection point between the suction line and the haulage line, a constriction is provided after which the cross section in the suction line increases again. By increasing the cross section, the pressure in the intake manifold decreases, so that fuel from the fuel tank is sucked through the intake manifold into the storage pot.
  • the suction jet pump By supplying the suction jet pump with fuel directly from the fuel filter, a clean supply of the suction jet pump can be ensured.
  • the direct supply of the suction jet pump from the fuel filter the life of the electric fuel pump can be increased.
  • the suction jet pump can be turned “on” and "off".
  • the first pressure valve may also be referred to as a partial pressure relief valve, pressure relief valve or pressure relief valve.
  • the first pressure valve is arranged on or in the treble line.
  • the first pressure valve has a defined opening pressure. That is, the pressure valve opens only when a predetermined first pressure threshold is exceeded. In this case, when the first threshold value is exceeded, the first pressure valve opens automatically, that is to say without the need for activation.
  • the first pressure valve limits the maximum pressure prevailing in the fuel filter in the shutdown case of the fuel delivery system.
  • the first pressure valve may have a seal and a spring. By means of the spring, the opening pressure or the first threshold value can be determined, for example, via the spring constant.
  • the first threshold value lies between a vapor pressure of the fuel at a shut-off temperature of the fuel delivery system or of the motor vehicle and a system pressure.
  • the vapor pressure of the fuel can correspond to a pressure limit of the outgassing of the fuel. In this case, this vapor pressure can depend both on the temperature and on the type of fuel.
  • the shutdown temperature can be between 0 ° C and 60 ° C, for example.
  • the first threshold is selected such that the first pressure valve opens at the highest possible shutdown temperature in the fuel filter of, for example, 60 ° C and at a fuel having the highest vapor pressure, only when the subsystem pressure in the fuel filter is high enough To prevent outgassing.
  • the first threshold value is between 1.5 bar and 4 bar.
  • the first threshold is greater than 2.2 bar.
  • the first threshold is 2.5 bar.
  • the fuel delivery system further comprises a control unit and a fuel pump for delivering fuel from the storage pot to the fuel filter.
  • the control unit is designed to control the fuel pump in such a way that a supply to the ejector pump is switched off by operating the fuel pump at a pressure which is less than the first threshold value of the first pressure valve.
  • the feeding of the suction jet pump that is to say the supply of the suction jet pump with the propellant fuel
  • the fuel pump which can be designed as an electric fuel pump.
  • the fuel delivery system at sufficiently high tank level in the fuel tank and at normal operating parameters of the injection system or the internal combustion engine are operated at a pressure below the first threshold pressure. In this case, the first pressure valve does not open. As a result, a smaller flow rate of the fuel pump is sufficient to operate the fuel delivery system.
  • the fuel delivery system further comprises a flow line, which is arranged between the fuel filter and the internal combustion engine.
  • a second pressure valve is provided which opens to the fuel tank when a pressure in the flow line exceeds a second threshold.
  • the second threshold is greater than the first threshold.
  • the flow line can also be referred to as a pressure line.
  • the second pressure valve may be similar to the first pressure valve, for example, designed as a spring-loaded pressure relief valve and having a predetermined opening pressure.
  • the opening pressure of the second pressure valve is higher than the first pressure valve, since the temperatures rise towards the internal combustion engine and thus a higher pressure on the combustion engine side of the fuel delivery system is appropriate to avoid outgassing of the fuel.
  • the second pressure valve opens in the direction of the fuel tank and can run, for example, excess funded fuel from the flow line back into the fuel tank or in the storage tank.
  • the second threshold value is between 5 bar and 7.5 bar.
  • the second threshold is 7.5 bar.
  • a first check valve is provided between the fuel pump and the fuel filter, which opens in the direction of the fuel filter.
  • the first check valve may also be referred to as a "check valve".
  • the first check valve is arranged on or in a line between the fuel pump and the fuel filter.
  • the third threshold or the opening pressure of the first check valve may be substantially lower than the first and second threshold values.
  • the third threshold may be between 1 mbar and 2.5 bar.
  • the third threshold may, for example, correspond to a static pressure of the fuel column above the first check valve.
  • the first check valve may prevent leakage of the fuel in an accident and upside down vehicle.
  • a second check valve is provided between the internal combustion engine and the fuel filter on the flow line, which opens in the direction of the internal combustion engine.
  • the second check valve may be similar or identical to the first check valve and performs a similar or identical task.
  • the first and second check valves may prevent undesired backflow of the fuel.
  • the first pressure valve is arranged above the fuel filter when the fuel delivery system is installed in a fuel tank of a motor vehicle.
  • the treble line may branch off in an upper region of the fuel filter and in particular on a cover of the fuel filter.
  • the method comprises the steps of: providing a fuel filter in a fuel tank for purifying fuel conveyed from a storage pot to an internal combustion engine; Providing a suction jet pump in a fuel tank for filling the storage pot with fuel from a fuel tank; hydraulically connecting the ejector pump to the fuel filter via a tether line; Arranging a first pressure valve on the hauling line; and designing the first pressure valve such that this in
  • Direction of the suction jet pump opens when a fuel filter side pressure exceeds a first threshold.
  • the fuel delivery system 1 is arranged on a storage pot 5 in a fuel tank 11.
  • the storage cup 5 is arranged as close to the bottom of the fuel tank 11 and accumulates fuel 9 to ensure a supply of the internal combustion engine 7 with fuel 9 even when cornering and thereby caused sloshing of the fuel 9 in the fuel tank 11.
  • the fuel delivery system 1 has a fuel filter 3, a fuel pump 29 and a suction jet pump 15.
  • the fuel pump 29 delivers fuel 9 from the storage cup 5 to the internal combustion engine 7.
  • the fuel 9 passes on the way to the internal combustion engine 7, the fuel filter 3 and is cleaned of unwanted particles.
  • the fuel 9 can be conveyed in the direction of the engine 7 via a flow line 13.
  • the supply line 13 extends through a tank flange 33 to an injection system 31, which supplies the fuel 9 of the internal combustion engine 7.
  • the suction jet pump 15 is in Fig. 1 shown schematically laterally on the storage cup 5.
  • the suction jet pump 15 at the lowest point that is, for example, at the bottom of the storage pot 5 run.
  • the suction jet pump 15 ensures that the storage cup 5 remains filled with fuel 9 regardless of the level in the fuel tank 11.
  • the suction jet pump 15 is driven via a drive line 17 with fuel 9.
  • the fuel 9 passes directly from the fuel filter 3 in the Trebtechnisch 17 and is guided via a throttle element, such as a nozzle in a connected to the reservoir cup 5 suction line.
  • the jet emerging from the nozzle in the suction line tears fuel 9 from the suction line, so that the fuel 9 of the propulsion jet and the entrained Kraftsoff 9 pass through a mixing channel in the storage pot 5.
  • a first pressure valve 19 is provided on the treble line 17, which automatically opens in the direction of the suction jet pump 15 when the pressure in the fuel filter 3 exceeds a first threshold value. That is, at an output of the fuel filter 3 is a designed as a partial pressure valve first pressure valve 19 is provided. The opening pressure of the first pressure valve 19 is between the relevant vapor pressure of the fuel 9 at the boundary to the outgassing and the operating pressure.
  • an overflow amount that is, an amount of fuel delivered by the fuel pump 29 and not currently required by the engine 7 thanks to the inventive design of the fuel delivery system 1 for feeding the ejector 15 can be used.
  • an increase in the overall efficiency of the fuel delivery system 1 is achieved compared to known systems in which the overflow is discharged freely into the storage tank.
  • the fuel delivery system 1 may include a control unit 27, which is operatively and electrically connected to the fuel pump 29, and can control these.
  • a control unit 27 which is operatively and electrically connected to the fuel pump 29, and can control these.
  • the supply of the suction jet pump 15 via the tethering line 17 "on and off" are.
  • This can be done, for example, by the fuel pump 29 being operated at a low power or at a lower pressure, so that the first threshold value is not exceeded and the first pressure valve 19 remains closed.
  • the power consumption of the fuel delivery system 1 can be further reduced in this operating state. For example, this may make sense with a sufficiently high tank level and normal operating parameters of the injection system 31 or internal combustion engine 7.
  • a second pressure valve 21 may be provided on the flow line 13, which opens to the fuel tank 11 when a pressure in the flow line 13 exceeds a second threshold.
  • the second threshold is between 5 bar and 7.5 bar and is greater than the first threshold, which is, for example, between 1.5 bar and 4 bar.
  • the second pressure valve 21 has a higher opening pressure, since the temperatures rise in the direction of the engine 7 and here higher pressures are needed to prevent outgassing of the fuel 9.
  • a first check valve 23 may further be provided, which opens in the direction of the fuel filter 3. Furthermore, between the internal combustion engine 7 and the fuel filter 3 on the supply line 13, a second check valve 25 may be provided which opens in the direction of the internal combustion engine 7. The first check valve 23 and the second check valve 25 can prevent unwanted backflow of the fuel 9.
  • Fig. 2 are vapor pressure curves of different fuels in a diagram.
  • a temperature in ° C is plotted on the x-axis.
  • a vapor pressure in kPa is plotted.
  • Different fuels may have different vapor pressure profiles as a function of the temperature. For example, a fuel at a temperature of 60 ° C have a vapor pressure of about 220 kPa and 2.2 bar. Another fuel may have a vapor pressure of 50 kPa or 0.5 bar at the same temperature. The individual vapor pressures can be taken into account when choosing the first threshold value.

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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)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Description

Stand der TechnikState of the art

Ein Kraftstoff-Fördersystem kann in einem Kraftstofftank eines Kraftfahrzeugs angeordnet werden und der Versorgung einer Brennkraftmaschine mit Kraftstoff dienen. Dabei kann das Kraftstoff-Fördersystem einen Kraftstofffilter aufweisen, um den Kraftstoff von unterwünschten Partikeln vor der Zuführung zur Brennkraftmaschine zu reinigen.A fuel delivery system may be disposed in a fuel tank of a motor vehicle and may be used to supply an internal combustion engine with fuel. In this case, the fuel delivery system may have a fuel filter to purify the fuel of undesirable particles before being supplied to the internal combustion engine.

Beim Abstellen bzw. im Abstellfall des Kraftfahrzeugs kann der Kraftstoff im Kraftstofftank und insbesondere im Kraftstofffilter ausgasen. Bei einer Wiederinbetriebnahme kann dies zu höheren Druckaufbauzeiten im Kraftstofffilter führen, da zunächst die Gase komprimiert und verflüssigt werden müssen.When parking or when parking the motor vehicle, the fuel in the fuel tank and in particular in the fuel filter can outgas. When restarting, this can lead to higher pressure build-up times in the fuel filter, since first the gases must be compressed and liquefied.

Um die Bildung von Dampfblasen zu vermeiden können Kraftstofffilter im Abstellfall unter Druck, insbesondere unter Systemdruck gehalten werden. Dies führt jedoch zu einer über die Lebensdauer höheren Beanspruchung der Kraftstofffilter.In order to avoid the formation of vapor bubbles, fuel filters can be kept under pressure under standby conditions, in particular under system pressure. However, this leads to a life-time stress on the fuel filter.

Die EP 1 126 157 A2 offenbart eine solche Kraftstoffversorgungseinrichtung.The EP 1 126 157 A2 discloses such a fuel supply device.

Die WO 2006 / 079 402 A1 schlägt vor über ein zweites Druckventil im Abstellfall einen geringeren Druck im gesamten System aufrecht zu erhalten.The WO 2006/079 402 A1 proposes to maintain a lower pressure throughout the system via a second pressure valve in the Abstellfall.

Die WO 2008 / 052 873 A1 beschreibt das Problem, dass der Filter im Abstellfall hoch belastet ist und schlägt ebenfalls vor den Druck im gesamten System zu reduzieren.The WO 2008/052 873 A1 describes the problem that the filter is heavily loaded in the Abstellfall and also proposes to reduce the pressure throughout the system.

Offenbarung der ErfindungDisclosure of the invention

Es kann daher ein Bedarf an einem verbesserten Kraftstoff-Fördersystem und einem entsprechenden Herstellungsverfahren für ein Kraftstoff-Fördersystem bestehen, die insbesondere eine geringere Beanspruchung des Kraftstofffilters über die Lebensdauer ermöglichen.There may therefore be a need for an improved fuel delivery system and a corresponding method of manufacturing a fuel delivery system, which in particular, allow for less fuel filter life stress.

Dieser Bedarf kann durch den Gegenstand der vorliegenden Erfindung gemäß dem unabhängigen Anspruch gedeckt werden. Vorteilhafte Ausführungsformen der vorliegenden Erfindung sind in den abhängigen Ansprüchen beschrieben. Im Folgenden werden Merkmale, Einzelheiten und mögliche Vorteile einer Vorrichtung gemäß Ausführungsformen der Erfindung im Detail diskutiert.This need can be met by the subject matter of the present invention according to the independent claim. Advantageous embodiments of the present invention are described in the dependent claims. In the following, features, details and possible advantages of a device according to embodiments of the invention will be discussed in detail.

Gemäß der Erfindung wird ein Kraftstoff-Fördersystem vorgestellt. Das Kraftstoff-Fördersystem weist einen Kraftstofffilter auf, der einen aus einem Speichertopf zu einer Brennkraftmaschine geförderten Kraftstoff reinigt bzw. filtert. Ferner weist das Kraftstoff-Fördersystem eine Saugstrahlpumpe (SSP) zum Befüllen des Speichertopfs mit Kraftstoff aus einem Kraftstofftank auf. Der Kraftstofffilter ist dabei über eine Treibleitung mit der Saugstrahlpumpe hydraulisch verbunden. An der Treibleitung ist ein erstes Druckventil vorgesehen ist, welches automatisch in Richtung der Saugstrahlpumpe öffnet, wenn ein Druck im Kraftstofffilter einen ersten Schwellenwert übersteigt.According to the invention, a fuel delivery system is presented. The fuel delivery system includes a fuel filter that cleans or filters a fuel delivered from a storage pot to an internal combustion engine. Furthermore, the fuel delivery system has a suction jet pump (SSP) for filling the storage tank with fuel from a fuel tank. The fuel filter is hydraulically connected via a tether with the suction jet pump. At the treble line a first pressure valve is provided which opens automatically in the direction of the suction jet pump when a pressure in the fuel filter exceeds a first threshold.

Anders ausgedrückt basiert die Idee der Erfindung darauf, ein Druckventil mit einem definierten Öffnungsdruck in eine Speisung der Saugstrahlpumpe zu integrieren. Der Öffnungsdruck liegt dabei zwischen einem Dampfdruck des Kraftstoffs und dem Systemdruck. Das heißt, der Öffnungsdruck des ersten Druckventils kann an der Druckgrenze zur Ausgasung des Kraftstoffs gewählt sein. Hierbei liegt also im Abstellfall des Kraftfahrzeugs ein Teilsystemdruck am Kraftstofffilter an.In other words, the idea of the invention is based on integrating a pressure valve with a defined opening pressure into a feed of the ejector pump. The opening pressure is between a vapor pressure of the fuel and the system pressure. That is, the opening pressure of the first pressure valve may be selected at the pressure limit for outgassing of the fuel. In the case of a shutdown of the motor vehicle, a subsystem pressure is applied to the fuel filter.

Hierdurch kann vorteilhaft die Druckbelastung und damit auch der Verschleiß des Kraftstofffilters bzw. des Filtergehäuses im Abstellfall des Kraftfahrzeugs reduziert werden. Gleichzeitig kann ein Ausgasen des Kraftstoffs und damit unnötig verzögerte Widerstartzeiten der Brennkraftmaschine verhindert werden.In this way, advantageously, the pressure load and thus also the wear of the fuel filter and the filter housing in the Abstellfall of the motor vehicle can be reduced. At the same time, outgassing of the fuel and thus unnecessarily delayed re-start times of the internal combustion engine can be prevented.

Ferner können dank der erfindungsgemäßen Ausgestaltung des Kraftstoff-Fördersystems kostengünstige Filtergehäuse, beispielsweise aus Polyoxymethylen (POM), auch bei höheren Systemdrücken während der Fahrt ohne Einbußen der Lebensdauer des Kraftstofffilters verwendet werden. Die höheren Systemdrücke während der Fahrt können dabei dadurch ausgeglichen werden, dass im Abstellfall der Kraftstofffilter auf einem geringeren Druck gehalten wird als während der Fahrt. Auf diese Weise steigt die Gesamtbelastung des Kraftstofffilters über seine Lebensdauer nicht gegenüber bekannten Kraftstoff-Fördersystemen.Furthermore, thanks to the inventive design of the fuel delivery system cost-effective filter housing, such as polyoxymethylene (POM), even at higher system pressures while driving without sacrificing the life of the fuel filter can be used. The higher system pressures while driving can thereby be compensated be that in the Abstellfall the fuel filter is kept at a lower pressure than while driving. In this way, the total load of the fuel filter over its lifetime does not increase over known fuel delivery systems.

Durch die Anordnung des ersten Druckventils in der Treibleitung, die den Kraftstofffilter mit der Saugstrahlpumpe verbindet, kann die Überströmmenge des Kraftstoffs zur Speisung der Saugstrahlpumpe verwendet werden. Das heißt, das erste Druckventil kann bei Betrieb der Brennkraftmaschine bzw. des Kraftstoff-Fördersystems eine von einer Kraftstoffpumpe zum Speichertopf geförderte und von der Brennkraftmaschine nicht benötigte Kraftstoffmenge als Überströmmenge in die Treibleitung durchlassen. Auf diese Weise kann die Überströmmenge zur Speisung der Saugstrahlpumpe verwendet werden. Dies ermöglicht wiederrum einen höheren Wirkungsgrad des Kraftstoff-Fördersystems im Vergleich zu bisherigen Lösungen, bei denen die Überströmmenge frei abgeströmt, d.h. z.B. dem Kraftstofftank wieder zugeführt wurde.By arranging the first pressure valve in the treble line, which connects the fuel filter with the suction jet pump, the overflow of the fuel can be used to feed the ejector. That is, the first pressure valve can pass during operation of the internal combustion engine or the fuel delivery system funded by a fuel pump to the reservoir cup and not required by the internal combustion engine amount of fuel as a flow in the haulage. In this way, the overflow can be used to power the ejector. This in turn allows a higher efficiency of the fuel delivery system compared to previous solutions in which the spill freely flows, i. e.g. was returned to the fuel tank.

Das Kraftstoff-Fördersystem kann beispielsweise in einem Kraftstofftank eines Kraftfahrzeugs eingesetzt werden. Das Kraftfahrzeug kann beispielsweise ein Kraftfahrzeug mit einer Brennkraftmaschine, wie zum Beispiel einem Verbrennungsmotor, sein. Ferner kann das Kraftfahrzeug einen elektrischen Antrieb aufweisen und als Hybridfahrzeug ausgeführt sein. Dabei kann das Kraftstoff-Fördersystem einen in einem im Kraftstofftank vorgesehenen Speichertopf bzw. Reservoir angeordnet sein. Der Speichertopf ist dabei möglichst nah am Boden des Kraftstofftanks angeordnet. Neben dem Kraftstofffilter können im Kraftstofftank und insbesondere im Speichertopf eine Elektrokraftstoffpumpe (EKP) gegebenenfalls mit einem Vorfilter und eine Saugstrahlpumpe vorgesehen sein.The fuel delivery system may for example be used in a fuel tank of a motor vehicle. The motor vehicle may be, for example, a motor vehicle with an internal combustion engine, such as an internal combustion engine. Furthermore, the motor vehicle may have an electric drive and be designed as a hybrid vehicle. In this case, the fuel delivery system may be arranged in a storage tank or reservoir provided in the fuel tank. The storage pot is arranged as close as possible to the bottom of the fuel tank. In addition to the fuel filter, an electric fuel pump (EKP) can optionally be provided with a pre-filter and a suction jet pump in the fuel tank and in particular in the storage pot.

Der Kraftstofffilter kann als Feinfilter bzw. Lebensdauerfilter ausgeführt sein. Dabei ist der Kraftstofffilter ausgeführt, den Kraftstoff, der aus dem Kraftstofftank bzw. aus dem Speichertopf zur Brennkraftmaschine bzw. zum Verbrennungsmotor geleitet wird, von unerwünschten Partikeln zu reinigen. Der Kraftstofffilter und insbesondere das Filtergehäuse kann ausgeführt sein, bei einem Systemdruck von 7 bis 8 bar eingesetzt zu werden.The fuel filter can be designed as a fine filter or lifetime filter. In this case, the fuel filter is designed to clean the fuel that is passed from the fuel tank or from the storage pot to the internal combustion engine or to the internal combustion engine, from unwanted particles. The fuel filter and in particular the filter housing can be designed to be used at a system pressure of 7 to 8 bar.

Der Kraftstoff kann zum Beispiel über eine Saugleitung der Saugstrahlpumpe aus dem Kraftstofftank ins Innere des Speichertopfs gepumpt werden. Aus dem Speichertopf kann der Kraftstoff durch eine Kraftstoffpumpe, insbesondere eine Elektrokraftstoffpumpe zum Filter und anschließend durch eine Vorlaufleitung zu einem Einspritzsystem der Brennkraftmaschine gepumpt werden.For example, the fuel can be pumped from the fuel tank into the interior of the storage pot via a suction line of the suction jet pump. The fuel can be pumped out of the storage pot by a fuel pump, in particular an electric fuel pump, to the filter and then through a supply line to an injection system of the internal combustion engine.

Die Saugstrahlpumpe kann am Speichertopf angeordnet und als liegende oder stehende Saugstrahlpumpe ausgeführt sein. Durch die Treibleitung der Saugstrahlpumpe wird Kraftstoff direkt aus dem Kraftstofffilter an eine Saugleitung geliefert. An der Verbindungsstelle zwischen Saug- und Treibleitung ist eine Verengung vorgesehen, nach der sich der Querschnitt in der Saugleitung wieder vergrößert. Durch die Vergrößerung des Querschnitts sinkt der Druck im Saugrohr, so dass Kraftstoff aus dem Kraftstofftank durch das Saugrohr in den Speichertopf gesaugt wird.The suction jet pump can be arranged on the storage pot and designed as a horizontal or vertical suction jet pump. Due to the tethering of the suction jet pump fuel is delivered directly from the fuel filter to a suction line. At the connection point between the suction line and the haulage line, a constriction is provided after which the cross section in the suction line increases again. By increasing the cross section, the pressure in the intake manifold decreases, so that fuel from the fuel tank is sucked through the intake manifold into the storage pot.

Durch die Versorgung der Saugstrahlpumpe mit Kraftstoff direkt aus dem Kraftstofffilter kann eine saubere Speisung der Saugstrahlpumpe gewährleistet werden. Durch die direkte Speisung der Saugstrahlpumpe aus dem Kraftstofffilter kann die Lebensdauer der Elektrokraftstoffpumpe erhöht werden. Ferner kann durch das Vorsehen des ersten Druckventils an der Treibleitung der Saugstrahlpumpe wie weiter unter erläutert die Saugstrahlpumpe "an-" und "ausgeschaltet" werden.By supplying the suction jet pump with fuel directly from the fuel filter, a clean supply of the suction jet pump can be ensured. The direct supply of the suction jet pump from the fuel filter, the life of the electric fuel pump can be increased. Further, by providing the first pressure valve on the tether line of the suction jet pump, as explained further below, the suction jet pump can be turned "on" and "off".

Das erste Druckventil kann auch als Teildruckentlastungsventil, Druckbegrenzungsventil oder Überdruckventil bezeichnet werden. Das erste Druckventil ist an bzw. in der Treibleitung angeordnet. Dabei weist das erste Druckventil einen definierten Öffnungsdruck auf. Das heißt, das Druckventil öffnet lediglich, wenn ein vorgegebener erster Druck-Schwellenwert überschritten ist. Dabei öffnet das erste Druckventil bei Überschreiten des ersten Schwellenwerts automatisch, das heißt ohne die Notwendigkeit einer Ansteuerung. Insbesondere begrenzt das erste Druckventil den im Abstellfall des Kraftstoff-Fördersystems maximal im Kraftstofffilter herrschenden Druck. Beispielsweise kann das erste Druckventil eine Dichtung und eine Feder aufweisen. Mittels der Feder kann zum Beispiel über die Federkonstante der Öffnungsdruck bzw. der erste Schwellenwert festgelegt werden.The first pressure valve may also be referred to as a partial pressure relief valve, pressure relief valve or pressure relief valve. The first pressure valve is arranged on or in the treble line. In this case, the first pressure valve has a defined opening pressure. That is, the pressure valve opens only when a predetermined first pressure threshold is exceeded. In this case, when the first threshold value is exceeded, the first pressure valve opens automatically, that is to say without the need for activation. In particular, the first pressure valve limits the maximum pressure prevailing in the fuel filter in the shutdown case of the fuel delivery system. For example, the first pressure valve may have a seal and a spring. By means of the spring, the opening pressure or the first threshold value can be determined, for example, via the spring constant.

Gemäß der Erfindung liegt der erste Schwellenwert zwischen einem Dampfdruck des Kraftstoffs bei einer Abstelltemperatur des Kraftstoff-Fördersystems bzw. des Kraftfahrzeugs und einem Systemdruck. Der Dampfdruck des Kraftstoffs kann dabei einer Druckgrenze der Ausgasung des Kraftstoffs entsprechen. Dabei kann dieser Dampfdruck sowohl von der Temperatur als auch von der Art des Kraftstoffs abhängen. Die Abstelltemperatur kann dabei zum Beispiel zwischen 0°C und 60°C liegen.According to the invention, the first threshold value lies between a vapor pressure of the fuel at a shut-off temperature of the fuel delivery system or of the motor vehicle and a system pressure. The vapor pressure of the fuel can correspond to a pressure limit of the outgassing of the fuel. In this case, this vapor pressure can depend both on the temperature and on the type of fuel. The shutdown temperature can be between 0 ° C and 60 ° C, for example.

Bei der Wahl des ersten Schwellenwerts bzw. des Öffnungsdrucks des ersten Druckventils kann zum Beispiel ein Worst Case berücksichtigt werden. Das heißt, dass der erste Schwellenwert, so gewählt wird, dass das erste Druckventil bei der höchstmöglichen Abstelltemperatur im Kraftstofffilter von beispielsweise 60°C und bei einem Kraftstoff mit dem höchsten Dampfdruck, erst öffnet, wenn der Teilsystemdruck im Kraftstofffilter hoch genug ist, um ein Ausgasen zu verhindern.When choosing the first threshold value or the opening pressure of the first pressure valve, for example, a worst case can be taken into account. That is, the first threshold is selected such that the first pressure valve opens at the highest possible shutdown temperature in the fuel filter of, for example, 60 ° C and at a fuel having the highest vapor pressure, only when the subsystem pressure in the fuel filter is high enough To prevent outgassing.

Gemäß einem weiteren Ausführungsbeispiel der Erfindung liegt der erste Schwellenwert zwischen 1,5 bar und 4 bar. Vorzugsweise ist der erste Schwellenwert größer als 2,2 bar. Insbesondere liegt der erste Schwellenwert bei 2,5 bar.According to a further embodiment of the invention, the first threshold value is between 1.5 bar and 4 bar. Preferably, the first threshold is greater than 2.2 bar. In particular, the first threshold is 2.5 bar.

Gemäß einem weiteren Ausführungsbeispiel der Erfindung weist das Kraftstoff-Fördersystem ferner eine Steuereinheit und eine Kraftstoffpumpe zum Fördern von Kraftstoff aus dem Speichertopf zum Kraftstofffilter auf. Die Steuereinheit ist ausgeführt, die Kraftstoffpumpe derart anzusteuern, dass eine Speisung der Saugstrahlpumpe abgeschaltet wird, indem die Kraftstoffpumpe mit einem Druck betrieben wird, der kleiner ist als der erste Schwellenwert des ersten Druckventils.According to a further embodiment of the invention, the fuel delivery system further comprises a control unit and a fuel pump for delivering fuel from the storage pot to the fuel filter. The control unit is designed to control the fuel pump in such a way that a supply to the ejector pump is switched off by operating the fuel pump at a pressure which is less than the first threshold value of the first pressure valve.

Anders ausgedrückt, kann die Speisung der Saugstrahlpumpe, das heißt die Versorgung der Saugstrahlpumpe mit dem Treibmittel Kraftstoff über die Treibleitung "an-" und "ausgeschalten" werden. Dies kann durch entsprechende Ansteuerung der Kraftstoffpumpe, die als Elektrokraftstoffpumpe ausgeführt sein kann, geschehen. Auf diese Weise kann eine geringere Leistungsaufnahme des Kraftstoff-Fördersystem realisiert werden. Beispielsweise kann das Kraftstoff-Fördersystem bei ausreichend hohem Tankfüllstand im Kraftstofftank und bei normalen Betriebsparametern des Einspritzsystems bzw. des Verbrennungsmotors bei einem unter dem ersten Schwellenwert liegenden Druck betrieben werden. In diesem Fall öffnet das erste Druckventil nicht. Hierdurch ist eine geringere Fördermenge der Kraftstoffpumpe ausreichend um das Kraftstoff-Fördersystem zu betreiben.In other words, the feeding of the suction jet pump, that is to say the supply of the suction jet pump with the propellant fuel, can be "switched on" and "switched off" via the tether line. This can be done by appropriate control of the fuel pump, which can be designed as an electric fuel pump. In this way, a lower power consumption of the fuel delivery system can be realized. For example, the fuel delivery system at sufficiently high tank level in the fuel tank and at normal operating parameters of the injection system or the internal combustion engine are operated at a pressure below the first threshold pressure. In this case, the first pressure valve does not open. As a result, a smaller flow rate of the fuel pump is sufficient to operate the fuel delivery system.

Gemäß der Erfindung weist das Kraftstoff-Fördersystem ferner eine Vorlaufleitung auf, die zwischen dem Kraftstofffilter und der Brennkraftmaschine angeordnet ist. An bzw. in der Vorlaufleitung ist ein zweites Druckventil vorgesehen, welches zum Kraftstofftank öffnet, wenn ein Druck in der Vorlaufleitung einen zweiten Schwellenwert übersteigt. Der zweite Schwellenwert ist dabei größer als der erste Schwellenwert.
Die Vorlaufleitung kann auch als Druckleitung bezeichnet werden. Das zweite Druckventil kann ähnlich zum ersten Druckventil zum Beispiel als federbeaufschlagtes Überdruckventil ausgeführt sein und einen vorgegebenen Öffnungsdruck aufweisen. Der Öffnungsdruck des zweiten Druckventils liegt dabei höher als beim ersten Druckventil, da die Temperaturen zur Brennkraftmaschine hin steigen und damit ein höherer Druck auf der Brennmaschinenseite des Kraftstoff-Fördersystems angemessen ist um eine Ausgasung des Kraftstoffs zu vermeiden. Das zweite Druckventil öffnet dabei in Richtung zum Kraftstofftank und lässt zum Beispiel überschüssigen geförderten Kraftstoff aus der Vorlaufleitung zurück in den Kraftstofftank bzw. in den Speichertopf laufen.
Gemäß einem weiteren Ausführungsbeispiel der Erfindung liegt der zweite Schwellenwert zwischen 5 bar und 7,5 bar. Vorzugsweise liegt der zweite Schwellenwert bei 7,5 bar.According to the invention, the fuel delivery system further comprises a flow line, which is arranged between the fuel filter and the internal combustion engine. At or in the flow line, a second pressure valve is provided which opens to the fuel tank when a pressure in the flow line exceeds a second threshold. The second threshold is greater than the first threshold.
The flow line can also be referred to as a pressure line. The second pressure valve may be similar to the first pressure valve, for example, designed as a spring-loaded pressure relief valve and having a predetermined opening pressure. The opening pressure of the second pressure valve is higher than the first pressure valve, since the temperatures rise towards the internal combustion engine and thus a higher pressure on the combustion engine side of the fuel delivery system is appropriate to avoid outgassing of the fuel. The second pressure valve opens in the direction of the fuel tank and can run, for example, excess funded fuel from the flow line back into the fuel tank or in the storage tank.
According to a further embodiment of the invention, the second threshold value is between 5 bar and 7.5 bar. Preferably, the second threshold is 7.5 bar.

Gemäß der Erfindung ist zwischen der Kraftstoffpumpe und dem Kraftstofffilter ein erstes Rückschlagventil vorgesehen, welches in Richtung des Kraftstofffilters öffnet. Das erste Rückschlagventil kann auch als "check valve" bezeichnet werden. Dabei ist das erste Rückschlagventil an bzw. in einer Leitung zwischen der Kraftstoffpumpe und dem Kraftstofffilter angeordnet.According to the invention, a first check valve is provided between the fuel pump and the fuel filter, which opens in the direction of the fuel filter. The first check valve may also be referred to as a "check valve". In this case, the first check valve is arranged on or in a line between the fuel pump and the fuel filter.

Der dritte Schwellenwert bzw. der Öffnungsdruck des ersten Rückschlagventils kann dabei wesentlich geringer sein als der erste und der zweite Schwellenwert. Beispielsweise kann der dritte Schwellenwert zwischen 1 mbar und 2,5 bar liegen. Insbesondere kann der dritte Schwellenwert zum Beispiel einem statischen Druck der Kraftstoffsäule über dem ersten Rückschlagventil entsprechen. Das erste Rückschlagventil kann zum Beispiel bei einem Unfall und kopfüber positioniertem Fahrzeug ein Auslaufen des Kraftstoffs verhindern.The third threshold or the opening pressure of the first check valve may be substantially lower than the first and second threshold values. For example, the third threshold may be between 1 mbar and 2.5 bar. In particular, the third threshold may, for example, correspond to a static pressure of the fuel column above the first check valve. For example, the first check valve may prevent leakage of the fuel in an accident and upside down vehicle.

Gemäß der Erfindung ist zwischen der Brennkraftmaschine und dem Kraftstofffilter an der Vorlaufleitung ein zweites Rückschlagventil vorgesehen, welches in Richtung der Brennkraftmaschine öffnet. Das zweite Rückschlagventil kann ähnlich oder identisch zum ersten Rückschlagventil ausgeführt sein und erfüllt eine ähnliche bzw. identische Aufgabe. Insbesondere können das erste und das zweite Rückschlagventil ein unerwünschtes Zurückfließen des Kraftstoffs verhindern.
Gemäß einem weiteren Ausführungsbeispiel der Erfindung ist das erste Druckventil oberhalb des Kraftstofffilters angeordnet, wenn das Kraftstoff-Fördersystem in einen Kraftstofftank eines Kraftfahrzeugs eingebaut ist. Beispielsweise kann die Treibleitung in einem oberen Bereich des Kraftstofffilters und insbesondere an einem Deckel des Kraftstofffilters abzweigen. Durch die Anordnung des ersten Druckventils oberhalb des Kraftstofffilters bzw. im oberen Bereich des Kraftstofffilters kann sichergestellt werden, dass falls sich dennoch Gase im Kraftstofffilter bilden, diese zum Beispiel über das erste Druckventil und die Saugstrahlpumpe entweichen können.According to the invention, a second check valve is provided between the internal combustion engine and the fuel filter on the flow line, which opens in the direction of the internal combustion engine. The second check valve may be similar or identical to the first check valve and performs a similar or identical task. In particular, the first and second check valves may prevent undesired backflow of the fuel.
According to a further exemplary embodiment of the invention, the first pressure valve is arranged above the fuel filter when the fuel delivery system is installed in a fuel tank of a motor vehicle. For example, the treble line may branch off in an upper region of the fuel filter and in particular on a cover of the fuel filter. By arranging the first pressure valve above the fuel filter or in the upper region of the fuel filter, it can be ensured that if gases nevertheless form in the fuel filter, they can escape, for example, via the first pressure valve and the suction jet pump.

Weiterhin wird ein Verfahren zum Herstellen eines oben beschriebenen Kraftstoff-Fördersystems vorgestellt. Das Verfahren weist die folgenden Schritte auf: Vorsehen eines Kraftstofffilters in einem Kraftstofftank zum Reinigen von Kraftstoff, der aus einem Speichertopf zu einer Brennkraftmaschine gefördert wird; Vorsehen einer Saugstrahlpumpe in einem Kraftstofftank zum Befüllen des Speichertopfs mit Kraftstoff aus einem Kraftstofftank; hydraulisches Verbinden der Saugstrahlpumpe mit dem Kraftstofffilter über eine Treibleitung; Anordnen eines ersten Druckventils an der Treibleitung; und Ausgestalten des ersten Druckventils derart, dass dieses inFurthermore, a method for producing a fuel delivery system described above is presented. The method comprises the steps of: providing a fuel filter in a fuel tank for purifying fuel conveyed from a storage pot to an internal combustion engine; Providing a suction jet pump in a fuel tank for filling the storage pot with fuel from a fuel tank; hydraulically connecting the ejector pump to the fuel filter via a tether line; Arranging a first pressure valve on the hauling line; and designing the first pressure valve such that this in

Richtung der Saugstrahlpumpe öffnet, wenn ein Kraftstofffilter-seitiger Druck einen ersten Schwellenwert übersteigt.Direction of the suction jet pump opens when a fuel filter side pressure exceeds a first threshold.

Weitere Merkmale und Vorteile der vorliegenden Erfindung werden dem Fachmann aus der nachfolgenden Beschreibung beispielhafter Ausführungsformen, die jedoch nicht als die Erfindung beschränkend auszulegen sind, unter Bezugnahme auf die beigelegten Zeichnungen ersichtlich.

Fig. 1
zeigt einen schematischen Aufbau eines Kraftstoff-Fördersystems gemäß einem Ausführungsbeispiel der Erfindung
Fig. 2
zeigt Dampfdruckkurven verschiedener Kraftstoffe
Other features and advantages of the present invention will become apparent to those skilled in the art from the following description of exemplary embodiments, which are not to be construed as limiting the invention with reference to the accompanying drawings.
Fig. 1
shows a schematic structure of a fuel delivery system according to an embodiment of the invention
Fig. 2
shows vapor pressure curves of different fuels

Alle Figuren sind lediglich schematische Darstellungen erfindungsgemäßer Vorrichtungen bzw. ihrer Bestandteile gemäß Ausführungsbeispielen der Erfindung. Insbesondere Abstände und Größenrelationen sind in den Figuren nicht maßstabsgetreu wiedergegeben. In den verschiedenen Figuren sind sich entsprechende Elemente mit den gleichen Referenznummern versehen.All figures are merely schematic representations of devices according to the invention or of their components according to embodiments of the invention. In particular, distances and size relationships are not shown to scale in the figures. In the various figures, corresponding elements are provided with the same reference numbers.

In Fig. 1 ist das Kraftstoff-Fördersystem 1 an einem Speichertopf 5 in einem Kraftstofftank 11 angeordnet. Der Speichertopf 5 ist möglichst nahe am Boden des Kraftstofftanks 11 angeordnet und akkumuliert Kraftstoff 9, um auch bei einer Kurvenfahrt und den dadurch verursachten Schwappbewegungen des Kraftstoffs 9 im Kraftstofftank 11 eine Versorgung der Brennkraftmaschine 7 mit Kraftstoff 9 sicherstellen zu können.In Fig. 1 For example, the fuel delivery system 1 is arranged on a storage pot 5 in a fuel tank 11. The storage cup 5 is arranged as close to the bottom of the fuel tank 11 and accumulates fuel 9 to ensure a supply of the internal combustion engine 7 with fuel 9 even when cornering and thereby caused sloshing of the fuel 9 in the fuel tank 11.

Das Kraftstoff-Fördersystem 1 weist einen Kraftstofffilter 3, eine Kraftstoffpumpe 29 und eine Saugstrahlpumpe 15 auf. Die Kraftstoffpumpe 29 fördert Kraftstoff 9 aus dem Speichertopf 5 zur Brennkraftmaschine 7. Dabei passiert der Kraftstoff 9 auf dem Weg zur Brennkraftmaschine 7 den Kraftstofffilter 3 und wird von unerwünschten Partikeln gereinigt. Nach dem Kraftstofffilter 3 kann der Kraftstoff 9 in Richtung der Brennkraftmaschine 7 über eine Vorlaufleitung 13 gefördert werden. Die Vorlaufleitung 13 verläuft dabei durch einen Tankflansch 33 zu einem Einspritzsystem 31, welches den Kraftstoff 9 der Brennkraftmaschine 7 zuführt.The fuel delivery system 1 has a fuel filter 3, a fuel pump 29 and a suction jet pump 15. The fuel pump 29 delivers fuel 9 from the storage cup 5 to the internal combustion engine 7. The fuel 9 passes on the way to the internal combustion engine 7, the fuel filter 3 and is cleaned of unwanted particles. After the fuel filter 3, the fuel 9 can be conveyed in the direction of the engine 7 via a flow line 13. The supply line 13 extends through a tank flange 33 to an injection system 31, which supplies the fuel 9 of the internal combustion engine 7.

Die Saugstrahlpumpe 15 ist in Fig. 1 schematisch seitlich am Speichertopf 5 dargestellt. Vorzugsweise kann die Saugstrahlpumpe 15 am tiefsten Punkt, das heißt zum Beispiel am Boden des Speichertopfes 5 verlaufen. Die Saugstrahlpumpe 15 sorgt dafür, dass der Speichertopf 5 unabhängig vom Füllstand im Kraftstofftank 11 mit Kraftstoff 9 gefüllt bleibt. Dabei wird die Saugstrahlpumpe 15 über eine Treibleitung 17 mit Kraftstoff 9 angetrieben. Der Kraftstoff 9 gelangt direkt aus dem Kraftstofffilter 3 in die Treibleitung 17 und wird über ein Drosselelement, beispielsweise eine Düse, in eine mit dem Speichertopf 5 verbundene Saugleitung geführt. Der aus der Düse in die Saugleitung austretende Treibstrahl reißt Kraftstoff 9 aus der Saugleitung mit, so dass der Kraftstoff 9 des Treibstrahls und der mitgerissene Kraftsoff 9 über einen Mischkanal in den Speichertopf 5 gelangen.The suction jet pump 15 is in Fig. 1 shown schematically laterally on the storage cup 5. Preferably, the suction jet pump 15 at the lowest point, that is, for example, at the bottom of the storage pot 5 run. The suction jet pump 15 ensures that the storage cup 5 remains filled with fuel 9 regardless of the level in the fuel tank 11. In this case, the suction jet pump 15 is driven via a drive line 17 with fuel 9. The fuel 9 passes directly from the fuel filter 3 in the Trebleitung 17 and is guided via a throttle element, such as a nozzle in a connected to the reservoir cup 5 suction line. The jet emerging from the nozzle in the suction line tears fuel 9 from the suction line, so that the fuel 9 of the propulsion jet and the entrained Kraftsoff 9 pass through a mixing channel in the storage pot 5.

Wenn das Kraftfahrzeug abgestellt wird, das heißt wenn zum Beispiel die Brennkraftmaschine 7 nicht mehr läuft und gegebenenfalls der Zündschlüssel abgezogen ist, sinkt der Druck im Kraftstoff-Fördersystem 1. Bei bekannten Kraftstoff-Fördersystemen kann dies dazu führen, dass der im System und insbesondere im Kraftstofffilter befindliche Kraftstoff ausgast. Eine Ausgasung des Kraftstoffs 9 führt wiederrum zu verzögerten Startzeiten, da das Gas vor dem Start zunächst komprimiert werden muss. Wird der Kraftstofffilter dagegen auch im Abstellfall auf dem Betriebssystemdruck von zum Beispiel 7,5 bar gehalten, so kann es zu einem vorzeitigen Verschleiß des Kraftstofffilters kommen.When the motor vehicle is switched off, that is, when, for example, the internal combustion engine 7 is no longer running and possibly the ignition key is removed, the pressure in the fuel delivery system 1 decreases. In known fuel delivery systems, this can lead to damage in the system and in particular in the Fuel filter outgassing located fuel filter. Outgassing of the fuel 9 leads in turn to delayed start times, since the gas must first be compressed before starting. On the other hand, if the fuel filter is kept at the operating system pressure of 7.5 bar, for example, in the case of a shutdown, premature wear of the fuel filter can occur.

Bei dem erfindungsgemäßen Kraftstoff-Fördersystem 1 ist an der Treibleitung 17 ein erstes Druckventil 19 vorgesehen, das automatisch in Richtung der Saugstrahlpumpe 15 öffnet, wenn der Druck im Kraftstofffilter 3 einen ersten Schwellenwert übersteigt. Das heißt, an einem Ausgang des Kraftstofffilters 3 ist ein als Teildruckventil ausgeführtes erstes Druckventil 19 vorgesehen. Der Öffnungsdruck des ersten Druckventils 19 liegt zwischen dem relevanten Dampfdruck des Kraftstoffs 9 an der Grenze zur Ausgasung und dem Betriebssystemdruck.In the fuel delivery system 1 according to the invention, a first pressure valve 19 is provided on the treble line 17, which automatically opens in the direction of the suction jet pump 15 when the pressure in the fuel filter 3 exceeds a first threshold value. That is, at an output of the fuel filter 3 is a designed as a partial pressure valve first pressure valve 19 is provided. The opening pressure of the first pressure valve 19 is between the relevant vapor pressure of the fuel 9 at the boundary to the outgassing and the operating pressure.

Hierdurch wird eine Beanspruchung des Filtergehäuses über die Lebensdauer des Kraftstofffilters 3 deutlich reduziert werden. Die Zeitdauer mit hohen Drücken wird wesentlich reduziert, da im Abstellfall lediglich ein Teildruck im Kraftstofffilter 3 ansteht. Dieser Teildruck gewährleistet, dass der Kraftstoff 9 nicht ausgast. Auf diese Weise können kurze Wiederstartzeiten der Brennkraftmaschine 7 sichergestellt werden.As a result, a stress on the filter housing over the life of the fuel filter 3 can be significantly reduced. The period of time with high pressures is substantially reduced, since in the Abstellfall only a partial pressure in the fuel filter 3 is pending. This partial pressure ensures that the fuel 9 does not outgas. On In this way, short restart times of the internal combustion engine 7 can be ensured.

Bei Betrieb des Kraftstoff-Fördersystems 1 kann eine Überströmmenge, das heißt, eine von der Kraftstoffpumpe 29 geförderte und von der Brennkraftmaschine 7 aktuell nicht benötigte Kraftstoffmenge dank der erfindungsgemäßen Ausgestaltung des Kraftstoff-Fördersystems 1 zur Speisung der Saugstrahlpumpe 15 genutzt werden. Damit wird im Vergleich zu bekannten Systemen, bei denen die Überströmmenge frei in den Speichertopf abgeströmt wird, eine Steigerung des Gesamtwirkungsgrads des Kraftstoff-Fördersystems 1 erreicht.During operation of the fuel delivery system 1, an overflow amount, that is, an amount of fuel delivered by the fuel pump 29 and not currently required by the engine 7 thanks to the inventive design of the fuel delivery system 1 for feeding the ejector 15 can be used. Thus, an increase in the overall efficiency of the fuel delivery system 1 is achieved compared to known systems in which the overflow is discharged freely into the storage tank.

Ferner kann das Kraftstoff-Fördersystems 1 eine Steuereinheit 27 aufweisen, die funktional bzw. elektrisch mit der Kraftstoffpumpe 29 verbunden ist, und diese ansteuern kann. Durch eine geeignete Wahl des ersten Schwellenwertes des ersten Druckventils 19 und eine entsprechende Ansteuerung der Kraftstoffpumpe 29 durch die Steuereinheit 27 kann die Speisung der Saugstrahlpumpe 15 über die Treibleitung 17 "an- und abgeschaltet" werden. Dies kann zum Beispiel dadurch geschehen, dass die Kraftstoffpumpe 29 mit einer geringen Leistung bzw. unter geringerem Druck betrieben wird, so dass der erste Schwellenwert nicht überschritten wird und das erste Druckventil 19 geschlossen bleibt. Auf diese Weise kann die Leistungsaufnahme des Kraftstoff-Fördersystems 1 in diesem Betriebszustand weiter reduziert werden. Beispielsweise kann dies bei ausreichend hohem Tankfüllstand und normalen Betriebsparametern des Einspritzsystems 31 bzw. Brennkraftmaschine 7 sinnvoll sein.Further, the fuel delivery system 1 may include a control unit 27, which is operatively and electrically connected to the fuel pump 29, and can control these. By a suitable choice of the first threshold value of the first pressure valve 19 and a corresponding control of the fuel pump 29 by the control unit 27, the supply of the suction jet pump 15 via the tethering line 17 "on and off" are. This can be done, for example, by the fuel pump 29 being operated at a low power or at a lower pressure, so that the first threshold value is not exceeded and the first pressure valve 19 remains closed. In this way, the power consumption of the fuel delivery system 1 can be further reduced in this operating state. For example, this may make sense with a sufficiently high tank level and normal operating parameters of the injection system 31 or internal combustion engine 7.

Ferner kann an der Vorlaufleitung 13 ein zweites Druckventil 21 vorgesehen sein, das zum Kraftstofftank 11 öffnet, wenn ein Druck in der Vorlaufleitung 13 einen zweiten Schwellenwert übersteigt. Der zweite Schwellenwert liegt zum Beispiel zwischen 5 bar und 7,5 bar und ist größer als der erste Schwellenwert, der zum Beispiel zwischen 1,5 bar und 4 bar liegt. Das zweite Druckventil 21 weist einen höheren Öffnungsdruck auf, da die Temperaturen in Richtung zur Brennkraftmaschine 7 steigen und hier höhere Drücke benötigt werden um eine Ausgasung des Kraftstoffs 9 zu verhindern.Further, a second pressure valve 21 may be provided on the flow line 13, which opens to the fuel tank 11 when a pressure in the flow line 13 exceeds a second threshold. For example, the second threshold is between 5 bar and 7.5 bar and is greater than the first threshold, which is, for example, between 1.5 bar and 4 bar. The second pressure valve 21 has a higher opening pressure, since the temperatures rise in the direction of the engine 7 and here higher pressures are needed to prevent outgassing of the fuel 9.

Zwischen der Kraftstoffpumpe 29 und dem Kraftstofffilter 3 kann ferner ein erstes Rückschlagventil 23 vorgesehen sein, welches in Richtung des Kraftstofffilters 3 öffnet. Des Weiteren kann zwischen der Brennkraftmaschine 7 und dem Kraftstofffilter 3 an der Vorlaufleitung 13 ein zweites Rückschlagventil 25 vorgesehen sein, welches in Richtung der Brennkraftmaschine 7 öffnet. Das erste Rückschlagventil 23 und das zweite Rückschlagventil 25 können dabei ein unerwünschtes Zurückfließen des Kraftstoffs 9 verhindern.Between the fuel pump 29 and the fuel filter 3, a first check valve 23 may further be provided, which opens in the direction of the fuel filter 3. Furthermore, between the internal combustion engine 7 and the fuel filter 3 on the supply line 13, a second check valve 25 may be provided which opens in the direction of the internal combustion engine 7. The first check valve 23 and the second check valve 25 can prevent unwanted backflow of the fuel 9.

In Fig. 2 sind Dampfdruckkurven verschiedener Kraftstoffe in einem Diagramm dargestellt. Auf der x-Achse ist dabei eine Temperatur in °C aufgetragen. Auf der y-Achse ist ein Dampfdruck in kPa aufgetragen. Dabei können unterschiedliche Kraftstoffe unterschiedliche Dampfdruckverläufe in Abhängigkeit von der Temperatur aufweisen. Beispielsweise kann ein Kraftstoff bei einer Temperatur von 60°C einen Dampfdruck von ca. 220 kPa bzw. 2,2 bar aufweisen. Ein anderer Kraftstoff kann bei der gleichen Temperatur einen Dampfdruck von 50 kPa bzw. 0,5 bar aufweisen. Die einzelnen Dampfdrücke können bei der Wahl des ersten Schwellenwertes berücksichtigt werden.In Fig. 2 are vapor pressure curves of different fuels in a diagram. A temperature in ° C is plotted on the x-axis. On the y-axis, a vapor pressure in kPa is plotted. Different fuels may have different vapor pressure profiles as a function of the temperature. For example, a fuel at a temperature of 60 ° C have a vapor pressure of about 220 kPa and 2.2 bar. Another fuel may have a vapor pressure of 50 kPa or 0.5 bar at the same temperature. The individual vapor pressures can be taken into account when choosing the first threshold value.

Abschließend wird angemerkt, dass Ausdrücke wie "aufweisend" oder ähnliche nicht ausschließen sollen, dass weitere Elemente oder Schritte vorgesehen sein können. Des Weiteren sei darauf hingewiesen, dass "eine" oder "ein" keine Vielzahl ausschließen. Außerdem können in Verbindung mit den verschiedenen Ausführungsformen beschriebene Merkmale beliebig miteinander kombiniert werden. Es wird ferner angemerkt, dass die Bezugszeichen in den Ansprüchen nicht als den Umfang der Ansprüche beschränkend ausgelegt werden sollen.Finally, it should be noted that terms such as "having" or the like are not intended to exclude that other elements or steps may be provided. It should also be noted that "a" or "an" does not exclude a multitude. In addition, features described in connection with the various embodiments may be combined with each other as desired. It is further noted that the reference signs in the claims should not be construed as limiting the scope of the claims.

Claims (5)

  1. Fuel delivery system (1), the fuel delivery system (1) having a fuel filter (3) which cleans fuel (9) sucked in from a storage pot (5); a suction jet pump (15) for filling the storage pot (5) with fuel (9) from a fuel tank (11); wherein a drive line (17) connects the suction jet pump (15) to the fuel filter (3); wherein a first pressure, valve (19) is provided on the drive line (17), said first pressure valve (19) opening automatically in the direction of the suction jet pump (15) when a pressure on the fuel filter side exceeds a first threshold value, wherein the first threshold value is between a vapour pressure of the fuel (9) at a switch-off temperature of the fuel delivery system (1) and a system pressure, wherein a first non-return valve (23) is provided between the fuel pump (29) and the fuel filter (3), said first non-return valve (23) opening in the direction of the fuel filter (3), wherein a feed line (13) for connecting to an internal combustion engine (7) is provided downstream of the fuel filter (3), wherein a second pressure valve (21) is provided on the feed line (13), said second pressure valve (21) opening towards the fuel tank (11) when a pressure in the feed line (13) exceeds a second threshold value; characterized in that a second non-return valve (25) is provided in the feed line (13), said second non-return valve (25) opening in the direction of the internal combustion engine (7), and in that the second threshold value of the second pressure valve (21) is greater than the first threshold value of the first pressure valve (19).
  2. Fuel delivery system (1) according to Claim 1, wherein the first threshold value is between 1.5 bar and 4 bar.
  3. Fuel delivery system (1) according to either of Claims 1 and 2, also having a control unit (27), and a fuel pump (29) for delivering fuel (9) from the storage pot (5) to the fuel filter (3); wherein the control unit (27) is designed to control the fuel pump (29) such that feeding of the suction jet pump (15) is stopped by the fuel pump (29) being operated at a pressure which is less than the first threshold value of the first pressure valve (19).
  4. Fuel delivery system (1) according to Claim 1, wherein the second threshold value is between 5 bar and 7.5 bar.
  5. Fuel delivery system (1) according to one of Claims 1 to 4, wherein the first pressure valve (19) is arranged above the fuel filter (3) when the fuel delivery system (1) is installed in a fuel tank (11) of a motor vehicle.
EP14723827.3A 2013-06-26 2014-05-15 Fuel delivery system with partial pressure reduction valve in supply line of jet pump Not-in-force EP3014099B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013212267.5A DE102013212267A1 (en) 2013-06-26 2013-06-26 Fuel delivery system with partial pressure relief valve to drive line of a suction jet pump
PCT/EP2014/059923 WO2014206632A1 (en) 2013-06-26 2014-05-15 Fuel delivery system with partial pressure relief valve on the drive line of a suction jet pump

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EP3014099A1 EP3014099A1 (en) 2016-05-04
EP3014099B1 true EP3014099B1 (en) 2017-04-05

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EP14723827.3A Not-in-force EP3014099B1 (en) 2013-06-26 2014-05-15 Fuel delivery system with partial pressure reduction valve in supply line of jet pump

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US (1) US20160138537A1 (en)
EP (1) EP3014099B1 (en)
CN (1) CN105339643A (en)
DE (1) DE102013212267A1 (en)
WO (1) WO2014206632A1 (en)

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EP3014099A1 (en) 2016-05-04
CN105339643A (en) 2016-02-17
DE102013212267A1 (en) 2014-12-31
US20160138537A1 (en) 2016-05-19
WO2014206632A1 (en) 2014-12-31

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