EP0661437B1 - Fuel supply system for a vehicle with Otto engine - Google Patents

Fuel supply system for a vehicle with Otto engine Download PDF

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Publication number
EP0661437B1
EP0661437B1 EP94118841A EP94118841A EP0661437B1 EP 0661437 B1 EP0661437 B1 EP 0661437B1 EP 94118841 A EP94118841 A EP 94118841A EP 94118841 A EP94118841 A EP 94118841A EP 0661437 B1 EP0661437 B1 EP 0661437B1
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EP
European Patent Office
Prior art keywords
pump
fuel
fuel tank
fuel supply
injection unit
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.)
Expired - Lifetime
Application number
EP94118841A
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German (de)
French (fr)
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EP0661437A1 (en
Inventor
Erwin Brunnhofer
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Technoflow Tube Systems GmbH
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Technoflow Tube Systems GmbH
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Publication of EP0661437A1 publication Critical patent/EP0661437A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • 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
    • F02M37/0017—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor related to fuel pipes or their connections, e.g. joints or sealings
    • 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
    • F02M37/0076—Details of the fuel feeding system related to the fuel tank

Definitions

  • the invention is based on a fuel supply system for a motor vehicle with a gasoline engine, the one Has a fuel injection system with an injection rail, with fuel tank, pump, flow line system from Fuel tank to the fuel rail, return line system from the fuel rail to the fuel tank, where the return line system via a means for pressure regulation is connected to the injection rail, where fuel tank, pump, flow line system and Injection bar form a fuel supply device, whose pump with the gasoline engine running according to promotes its different operating conditions, the fuel tank with a venting device provided and otherwise from the free Atmosphere is separated.
  • the characteristic flow pipe system denotes single, multiple and branched flow lines. Accordingly, of course the term return line system. In the fuel tank can be atmospheric pressure or an overpressure.
  • a fuel supply system of the type mentioned Type from which the invention is based is from US-A-4 926 829 known.
  • this known fuel supply system becomes during the operation of the gasoline engine essentially continuously excess fuel from the injection rail via a return line into the Fuel tank returned.
  • the return line points a throttle device in the fuel tank with which the fuel flows through the return line can be restricted so that there is in the return line forms a fuel backlog, as it were.
  • the fuel flowing through the return line or Fuel that is stuck in the return line is the Exposed to a variety of heat sources, For example, the heat that is arranged in the engine block Injection bar arises or from that Gearbox of the motor vehicle is being developed.
  • the invention is based on the technical problem disturbing fuel losses and fuel changes due to fuel evaporation in fuel supply systems for a motor vehicle with a gasoline engine avoid.
  • the invention teaches to solve this technical problem a fuel supply system of the aforementioned Kind, which is characterized in that the means a controllable overflow valve for pressure regulation which overflow valve is only briefly at Commissioning of the gasoline engine via a starter control device for the gasoline engine and / or the pressure the pump is controllable in the open position, and that at least the fuel tank, the flow pipe system and the fuel rail is insulated.
  • the overflow valve On the pressure of the pump when starting up of the gasoline engine in the open position controlled, so you will control or regulate the pump so that a pressure pulse when starting the gasoline engine arises while the pump is running Gasoline engine and all operating conditions in the fuel rail a constant static fuel pressure maintained.
  • the invention takes into account the fact that Fuel supply system for a motor vehicle with Otto engine affect a variety of heat sources, namely the fuel pump with its engine if this Unit is arranged in the fuel tank on the engine block arranged injection bar, the heat to the over the return line system delivers returning fuel, the exhaust system when it's near the fuel tank is arranged, and also the transmission of the Motor vehicle that heats up while driving. in the the rest is heat introduced by solar radiation and hot engine exhaust that flows to the flow line system and the return line system as well as on the Soak in the fuel tank. Since according to the invention the return line system with normal operation of the motor vehicle is, as it were, turned off in relation to the prevention of annoying heat input great advantage if only the fuel tank, the flow line system and the injection rail are insulated.
  • the return line system is also heat insulating isolate.
  • the invention is based on the knowledge that that the disruptive influences of the described Heat sources and others by the combination of the specified Features practically completely interrupted can be so that a disturbing Evaporation of fuel with the resulting Disadvantages no longer occurs. It is understood that thermal insulation according to the rules of thermal insulation and Insulation technology is set up, namely under Taking the physics of the relationships into account Operation of the motor vehicle and also in relation to the Fuel and its temperature behavior.
  • the invention suppresses the permanent fuel circulation via the flow line system, the injection rail and the return line system.
  • the Pump set up in different ways be.
  • An embodiment of the invention provides that the pump with the gasoline engine running under all operating conditions a constant, maintains static fuel pressure.
  • Another Embodiment provides that the pump to one Control or regulating device is connected, which the delivery rate and / or the delivery pressure of the pump in Dependence on the speed and the load of the Otto engine controls.
  • the components fuel tank, flow line system and return line system made of plastic exist and consequently have poor heat conduction.
  • These components can be a heat insulating Coating made of thermal insulation plastic, e.g. B. polyurethane have, e.g. B. cohesive with the components connected is. That can be done in manufacturing Respects in a simple manner, e.g. B. by extrusion coating Reach components with the thermal insulation plastic.
  • the fuel supply system shown in the figures is for a motor vehicle with a petrol engine determined that a fuel injection system and one Injection bar has. The motor vehicle and his Gasoline engines were not drawn.
  • Fuel tank 1 include Fuel tank 1, a pump 2, a flow line system 3 from the fuel tank 1 to the fuel rail 4 and a Return line system 5 from the injection bar 4 to Fuel tank 1.
  • the fuel tank 1 is with a Ventilation device 6 provided and the rest of the separate atmosphere.
  • Fuel tank 1, pump 2, flow line system 3 and Injection strip 4 form a fuel supply device, whose pump 2 with the gasoline engine running in accordance with promotes its different operating conditions.
  • the Return line system 5 is controllable Overflow valve 7 connected to the injection bar 4, which overflow valve 7 only briefly Commissioning of the gasoline engine controllable in open position is. So there is no surplus funding that a constant during the operation of the gasoline engine Overflow of the overflow valve and a fuel circulation would require.
  • the overflow valve 7 is via a starter control device 9 for the gasoline engine and / or the pressure of the pump 2 when the Gasoline engine controllable in open position.
  • the pump 2 has a very high efficiency, so the power loss is small and thus the amount of heat is also small is generated by the pump 2 and its drive. In any case is the heat generated by the running pump 2 by suitable measures uncoupled from the fuel tank 1. Appropriate thermal insulation measures could be used be carried out, even if the Pump 2 is located in the fuel tank 1 with its drive.
  • the exemplary embodiment is the pump 2 with its drive however arranged outside the fuel tank 1 and consequently, the one created by the running pump 2 Heat decoupled from the fuel tank 1 in this way.
  • the Fuel supply can be set up accordingly.
  • a Possibility is the arrangement and interpretation so to make sure that the pump 2 with the gasoline engine running and all operating conditions in the injection bar 4 one maintains constant static fuel pressure. Should about the pressure of the fuel when the Otto engine overflow valve 7 briefly opened are, the pump 2 generates a corresponding Pressure pulse that is directly or indirectly for the Control of the overflow valve 7 can be used. It but there is also the possibility of pump 2 to one Control or regulating device 10 to connect the Delivery rate and / or the delivery pressure of the pump 2 in Controls depending on the speed of the gasoline engine.
  • the components fuel tank 1, flow line system 3, Return line system 5 advantageously consist of Plastic.
  • a thermally insulating coating 8 made of thermally insulating plastic to provide the cohesive with the components is connected, as the embodiment suggests.
  • FIG. 2 shows the invention Fuel supply system for a motor vehicle with Otto engine, which is a fuel injection system with fuel rail 4, and which basically as for FIG. 1 is constructed, but a return line system 5 from the injection bar 4 to the fuel tank 1 does not have.
  • the pump 2 is with her Drive arranged outside of the fuel tank 1.
  • the Pump 2 is connected to a control or regulating device 10 connected, which the discharge pressure of the pump 2 in Controls depending on the speed of the gasoline engine. To this extent, this control is based on demand Fuel supply.
  • fuel supply system additionally with a return line system To provide overflow valve, which is already in the explained only briefly Commissioning of the gasoline engine controllable in open position is. It can be thermally insulated.

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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

Die Erfindung geht aus von einem Kraftstoff-Versorgungssystem für ein Kraftfahrzeug mit Ottomotor, der ein Kraftstoffeinspritzsystem mit Einspritzleiste aufweist, mit Kraftstofftank, Pumpe, Vorlaufleitungssystem vom Kraftstofftank zur Einspritzleiste, Rücklaufleitungssystem von der Einspritzleiste zum Kraftstofftank, wobei das Rücklaufleitungssystem über ein Mittel zur Druckregulierung an die Einspritzleiste angeschlossen ist, wobei Kraftstofftank, Pumpe, Vorlaufleitungssystem und Einspritzleiste eine Kraftstoffzuführeinrichtung bilden, deren Pumpe bei laufendem Ottomotor nach Maßgabe von dessen unterschiedlichen Betriebsbedingungen fördert, wobei der Kraftstofftank mit einer Entlüftungseinrichtung versehen und im übrigen von der freien Atmosphäre getrennt ist. - Das Merkmal Vorlaufleitungssystem bezeichnet einfache, mehrfache und verzweigte Vorlaufleitungen. Entsprechend versteht sich der Begriff Rücklaufleitungssystem. Im Kraftstofftank kann Atmosphärendruck oder auch ein Überdruck herrschen.The invention is based on a fuel supply system for a motor vehicle with a gasoline engine, the one Has a fuel injection system with an injection rail, with fuel tank, pump, flow line system from Fuel tank to the fuel rail, return line system from the fuel rail to the fuel tank, where the return line system via a means for pressure regulation is connected to the injection rail, where fuel tank, pump, flow line system and Injection bar form a fuel supply device, whose pump with the gasoline engine running according to promotes its different operating conditions, the fuel tank with a venting device provided and otherwise from the free Atmosphere is separated. - The characteristic flow pipe system denotes single, multiple and branched flow lines. Accordingly, of course the term return line system. In the fuel tank can be atmospheric pressure or an overpressure.

Ein Kraftstoff-Versorgungssystem der eingangs genannten Art, von dem die Erfindung ausgeht, ist aus US-A-4 926 829 bekannt. Bei diesem bekannten Kraftstoff-Versorgungssystem wird während des Betriebs des Ottomotors im wesentlichen kontinuierlich überschüssiger Kraftstoff aus der Einspritzleiste über eine Rückführleitung in den Kraftstofftank zurückgeführt. Dabei weist die Rückführleitung in dem Kraftstofftank eine Drosseleinrichtung auf, mit der der Kraftstofffluß durch die Rückführleitung eingeschränkt werden kann, so daß sich in der Rückführleitung gleichsam ein Kraftstoffrückstau ausbildet. Der durch die Rückführleitung fließende Kraftstoff bzw. in der Rückführleitung aufgestaute Kraftstoff ist der Einwirkung einer Mehrzahl von Wärmequellen ausgesetzt, beispielsweise der Wärme, die in der am Motorblock angeordneten Einspritzleiste entsteht oder die von dem Getriebe des Kraftfahrzeuges entwickelt wird. Obwohl die Pumpe bei dem bekannten Kraftstoff-Versorgungssystem innerhalb eines speziellen Behälters in dem Kraftstofftank angeordnet ist, resultieren nichtsdestoweniger auch Erwärmungen des Kraftstoffs durch die als Wärmequelle wirkende Kraftstoffpumpe mit ihrem Motor. Eine nicht zu vernachlässigende Wärmeeinleitung in das Kraftstoff-Versorgungssystem wird hier in Kauf genommen. Sie ist nachteilig und bewirkt umweltbelastende Kraftstoffverluste sowie für den Betrieb des Ottomotors nachteilige Kraftstoffveränderungen durch Kraftstoffverdampfung. Die leicht verdampfenden Komponenten des Kraftstoffs destillieren sich ab.A fuel supply system of the type mentioned Type from which the invention is based is from US-A-4 926 829 known. In this known fuel supply system becomes during the operation of the gasoline engine essentially continuously excess fuel from the injection rail via a return line into the Fuel tank returned. The return line points a throttle device in the fuel tank with which the fuel flows through the return line can be restricted so that there is in the return line forms a fuel backlog, as it were. The fuel flowing through the return line or Fuel that is stuck in the return line is the Exposed to a variety of heat sources, For example, the heat that is arranged in the engine block Injection bar arises or from that Gearbox of the motor vehicle is being developed. Although the Pump in the known fuel supply system inside a special container in the fuel tank is arranged, nevertheless result Heating of the fuel as a heat source acting fuel pump with its engine. One not too neglecting heat input into the fuel supply system is accepted here. she is disadvantageous and causes environmentally harmful fuel losses as well as for the operation of the gasoline engine adverse fuel changes due to fuel evaporation. The easily evaporating components of the Fuel distill off.

Der Erfindung liegt das technische Problem zugrunde, störende Kraftstoffverluste und Kraftstoffveränderungen durch Kraftstoffverdampfungen bei Kraftstoff-Versorgungssystemen für ein Kraftfahrzeug mit Ottomotor zu vermeiden. The invention is based on the technical problem disturbing fuel losses and fuel changes due to fuel evaporation in fuel supply systems for a motor vehicle with a gasoline engine avoid.

Zur Lösung dieses technischen Problems lehrt die Erfindung ein Kraftstoff-Versorgungssystem der eingangs genannten Art, welches dadurch gekennzeichnet ist, daß das Mittel zur Druckregulierung ein steuerbares Überströmventil ist, welches Überströmventil lediglich kurzzeitig bei Inbetriebnahme des Ottomotors über eine Anlaß-Steuereinrichtung für den Ottomotor und/oder über den Druck der Pumpe in Offenstellung steuerbar ist, und daß zumindest der Kraftstofftank, das Vorlaufleitungssystem und die Einspritzleiste wärmedämmend isoliert sind. - Wird das Überströmventil über den Druck der Pumpe bei Inbetriebnahme des Ottomotors in die Offenstellung gesteuert, so wird man die Pumpe so steuern oder regeln, daß bei Inbetriebnahme des Ottomotors ein Druckimpuls entsteht, während im übrigen die Pumpe bei dem laufenden Ottomotor und allen Betriebsbedingungen in der Einspritzleiste einen konstanten statischen Kraftstoffdruck aufrechterhält.The invention teaches to solve this technical problem a fuel supply system of the aforementioned Kind, which is characterized in that the means a controllable overflow valve for pressure regulation which overflow valve is only briefly at Commissioning of the gasoline engine via a starter control device for the gasoline engine and / or the pressure the pump is controllable in the open position, and that at least the fuel tank, the flow pipe system and the fuel rail is insulated. - Becomes the overflow valve on the pressure of the pump when starting up of the gasoline engine in the open position controlled, so you will control or regulate the pump so that a pressure pulse when starting the gasoline engine arises while the pump is running Gasoline engine and all operating conditions in the fuel rail a constant static fuel pressure maintained.

Die Erfindung berücksichtigt die Tatsache, daß auf das Kraftstoff-Versorgungssystem für ein Kraftfahrzeug mit Ottomotor eine Mehrzahl von Wärmequellen einwirken, nämlich die Kraftstoffpumpe mit ihrem Motor, wenn dieses Aggregat im Kraftstofftank angeordnet ist, die am Motorblock angeordnete Einspritzleiste, die Wärme an den über das Rücklaufleitungssystem rücklaufenden Kraftstoff abgibt, die Auspuffanlage, wenn sie in der Nähe des Kraftstofftanks angeordnet ist, und auch das Getriebe des Kraftfahrzeuges, welches sich im Fahrbetrieb erwärmt. Im übrigen erfolgt eine Wärmeeinleitung durch Sonneneinstrahlung und heiße Motorabluft, die auf das Vorlaufleitungssystem und das Rücklaufleitungssystem sowie auf den Kraftstofftank einwirken. Da erfindungsgemäß das Rücklaufleitungssystem bei normalem Betrieb des Kraftfahrzeuges gleichsam ausgeschaltet ist, wird in bezug auf die Verhinderung störender Wärmeeinleitung bereits ein großer Vorteil erreicht, wenn lediglich der Kraftstofftank, das Vorlaufleitungssystem und die Einspritzleiste wärmedämmend isoliert sind. Es empfiehlt sich jedoch, auch das Rücklaufleitungssystem wärmedämmend zu isolieren. Die Erfindung geht von der Erkenntnis aus, daß die störenden Einflüsse der beschriebenen Wärmequellen und weiterer durch die Kombination der angegebenen Merkmale praktisch vollständig unterbrochen werden können, und zwar so, daß eine störende Kraftstoffverdunstung mit den daraus resultierenden Nachteilen nicht mehr eintritt. Es versteht sich, daß die Wärmedämmung nach den Regeln der Wärmedämm- und Isolationstechnik eingerichtet wird, und zwar unter Berücksichtigung der Physik der Zusammenhänge beim Betrieb des Kraftfahrzeuges und auch in bezug auf den Kraftstoff und sein Temperaturverhalten.The invention takes into account the fact that Fuel supply system for a motor vehicle with Otto engine affect a variety of heat sources, namely the fuel pump with its engine if this Unit is arranged in the fuel tank on the engine block arranged injection bar, the heat to the over the return line system delivers returning fuel, the exhaust system when it's near the fuel tank is arranged, and also the transmission of the Motor vehicle that heats up while driving. in the the rest is heat introduced by solar radiation and hot engine exhaust that flows to the flow line system and the return line system as well as on the Soak in the fuel tank. Since according to the invention the return line system with normal operation of the motor vehicle is, as it were, turned off in relation to the prevention of annoying heat input great advantage if only the fuel tank, the flow line system and the injection rail are insulated. However, it is recommended the return line system is also heat insulating isolate. The invention is based on the knowledge that that the disruptive influences of the described Heat sources and others by the combination of the specified Features practically completely interrupted can be so that a disturbing Evaporation of fuel with the resulting Disadvantages no longer occurs. It is understood that thermal insulation according to the rules of thermal insulation and Insulation technology is set up, namely under Taking the physics of the relationships into account Operation of the motor vehicle and also in relation to the Fuel and its temperature behavior.

Im einzelnen bestehen im Rahmen der Erfindung mehrere Möglichkeiten der weiteren Ausbildung und Gestaltung. Stets empfiehlt es sich, mit einer Pumpe zu arbeiten, die einen Wirkungsgrad von über 80 % aufweist und folglich nur in geringem Maße Verlustwärme produziert. Stets empfiehlt es sich fernerhin, die durch die laufende Pumpe entstehende Wärme von dem Kraftstofftank abzukoppeln. Das kann durch entsprechende Maßnahmen zur Unterbrechung der Wärmeleitung bzw. Maßnahmen zur Wärmedämmung erfolgen, das kann aber auch dadurch geschehen, daß die Pumpe außerhalb des Kraftstofftanks angeordnet ist.There are several in the scope of the invention Opportunities for further training and design. It is always advisable to work with a pump, which has an efficiency of over 80% and consequently only produces a small amount of heat. Always it is also recommended that the current Pump heat generated by the fuel tank disconnect. This can be done by taking appropriate measures Interruption of heat conduction or measures for thermal insulation done, but this can also be done by that the pump is placed outside the fuel tank is.

Die Erfindung unterdrückt die permanente Kraftstoffumwälzung über das Vorlaufleitungssystem, die Einspritzleiste und das Rücklaufleitungssystem. Dazu kann die Pumpe auf unterschiedliche Art und Weise eingerichtet sein. Eine Ausführungsform der Erfindung sieht vor, daß die Pumpe bei laufendem Ottomotor unter allen Betriebsbedingungen in der Einspritzleiste einen konstanten, statischen Kraftstoffdruck aufrechterhält. Eine andere Ausführungsform sieht vor, daß die Pumpe an eine Steuer- oder Regeleinrichtung angeschlossen ist, welche die Fördermenge und/oder den Abgabedruck der Pumpe in Abhängigkeit von der Drehzahl und der Belastung des Ottomotors steuert.The invention suppresses the permanent fuel circulation via the flow line system, the injection rail and the return line system. For this, the Pump set up in different ways be. An embodiment of the invention provides that the pump with the gasoline engine running under all operating conditions a constant, maintains static fuel pressure. Another Embodiment provides that the pump to one Control or regulating device is connected, which the delivery rate and / or the delivery pressure of the pump in Dependence on the speed and the load of the Otto engine controls.

Bei dem erfindungsgemäßen Kraftstoff-Versorgungssystem empfiehlt es sich, weitgehend auch die Wärmeleitung zum Kraftstofftank hin zu unterdrücken. Dazu lehrt die Erfindung, daß die Bauteile Kraftstofftank, Vorlaufleitungssystem und Rücklaufleitungssystem aus Kunststoff bestehen und folglich eine schlechte Wärmeleitung aufweisen. Diese Bauteile können eine wärmedämmende Beschichtung aus Wärmedamm-Kunststoff, z. B. Polyurethan aufweisen, die, z. B. stoffschlüssig, mit den Bauteilen verbunden ist. Das läßt sich in fertigungstechnischer Hinsicht auf einfache Weise, z. B. durch Umspritzen der Bauteile mit dem Wärmedamm-Kunststoff, erreichen.In the fuel supply system according to the invention it is advisable to largely also conduct heat Suppress fuel tank. To this end, the invention teaches that the components fuel tank, flow line system and return line system made of plastic exist and consequently have poor heat conduction. These components can be a heat insulating Coating made of thermal insulation plastic, e.g. B. polyurethane have, e.g. B. cohesive with the components connected is. That can be done in manufacturing Respects in a simple manner, e.g. B. by extrusion coating Reach components with the thermal insulation plastic.

Das technische Problem, welches der Erfindung zugrundeliegt, kann für besonders einfache Fälle auch durch eine Unterkombination der Merkmale des Patentanspruches 1 weitgehend gelöst werden. Dazu ist Gegenstand der Erfindung ein Kraftstoff-Versorgungssystem nach dem unabhängigen Patentanspruch 9. Bei dem Kraftstoff-Versorgungssystem nach diesem Patentanspruch 9 erfolgt eine bedarfsabhängige Kraftstoffzufuhr. Sie unterdrückt die Kraftstoffumwälzung. Auch bei dieser Ausführungsform ist ein Rücklaufleitungssystem von der Einspritzleiste zum Kraftstofftank angeordnet und über ein steuerbares Überströmventil an die Einspritzleiste angeschlossen, welches Überströmventil lediglich kurzzeitig bei Inbetriebnahme des Ottomotors in Offenstellung steuerbar ist. In diesem Falle ist auch das Rücklaufleitungssystem wärmedämmend isoliert.The technical problem on which the invention is based can also be used for a particularly simple case Sub-combination of the features of claim 1 largely solved. This is the subject of the invention a fuel supply system after independent claim 9. In the fuel supply system according to this claim 9 takes place on-demand fuel supply. It suppresses the Fuel circulation. Also in this embodiment is a return line system from the injection rail arranged to the fuel tank and via a controllable Overflow valve connected to the injection rail, which overflow valve only for a short time Commissioning of the gasoline engine controllable in open position is. In this case there is also the return line system insulated.

Im folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung ausführlicher erläutert. Es zeigen in schematischer Darstellung

Fig. 1
ein erfindungsgemäßes Kraftstoff-Versorgungssystem für ein Kraftfahrzeug mit Ottomotor und
Fig. 2
eine andere Ausführungsform eines erfindungsgemäßen Kraftstoff-Versorgungssystems.
In the following, the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. They show a schematic representation
Fig. 1
an inventive fuel supply system for a motor vehicle with a gasoline engine and
Fig. 2
another embodiment of a fuel supply system according to the invention.

Das in den Figuren dargestellte Kraftstoff-Versorgungssystem ist für ein Kraftfahrzeug mit Ottomotor bestimmt, der ein Kraftstoffeinspritzsystem und eine Einspritzleiste aufweist. Das Kraftfahrzeug und sein Ottomotor wurden nicht gezeichnet.The fuel supply system shown in the figures is for a motor vehicle with a petrol engine determined that a fuel injection system and one Injection bar has. The motor vehicle and his Gasoline engines were not drawn.

Zu dem Kraftstoff-Versorgungssystem nach Fig. 1 gehören ein Kraftstofftank 1, eine Pumpe 2, ein Vorlaufleitungssystem 3 vom Kraftstofftank 1 zur Einspritzleiste 4 und ein Rücklaufleitungssystem 5 von der Einspritzleiste 4 zum Kraftstofftank 1. Der Kraftstofftank 1 ist mit einer Entlüftungseinrichtung 6 versehen und im übrigen von der freien Atmosphäre getrennt.1 include Fuel tank 1, a pump 2, a flow line system 3 from the fuel tank 1 to the fuel rail 4 and a Return line system 5 from the injection bar 4 to Fuel tank 1. The fuel tank 1 is with a Ventilation device 6 provided and the rest of the separate atmosphere.

Kraftstofftank 1, Pumpe 2, Vorlaufleitungssystem 3 und Einspritzleiste 4 bilden eine Kraftstoffzuführeinrichtung, deren Pumpe 2 bei laufendem Ottomotor nach Maßgabe von dessen unterschiedlichen Betriebsbedingungen fördert. Das Rücklaufleitungssystem 5 ist über ein steuerbares Überströmventil 7 an die Einspritzleiste 4 angeschlossen, welches Überströmventil 7 lediglich kurzzeitig bei Inbetriebnahme des Ottomotors in Offenstellung steuerbar ist. Es findet also keine Überschußförderung statt, die während des Betriebes des Ottomotors ein fortwährendes Überströmen des Überströmventils und eine Kraftstoffumwälzung erforderlich machen würde.Fuel tank 1, pump 2, flow line system 3 and Injection strip 4 form a fuel supply device, whose pump 2 with the gasoline engine running in accordance with promotes its different operating conditions. The Return line system 5 is controllable Overflow valve 7 connected to the injection bar 4, which overflow valve 7 only briefly Commissioning of the gasoline engine controllable in open position is. So there is no surplus funding that a constant during the operation of the gasoline engine Overflow of the overflow valve and a fuel circulation would require.

Der Kraftstofftank 1, das Vorlaufleitungssystem 3, die Einspritzleiste 4 und das Rücklaufleitungssystem 5, vorzugsweise einschließlich des Überströmventils 7, sind wärmedämmend isoliert, und zwar im Ausführungsbeispiel durch eine Beschichtung 8. Man könnte aber auch Vakuumisolierungen oder dgl. anwenden. Das Überströmventil 7 ist über eine Anlaßsteuereinrichtung 9 für den Ottomotor und/oder über den Druck der Pumpe 2 bei Inbetriebnahme des Ottomotors in Offenstellung steuerbar. Die Pumpe 2 hat einen sehr hohen Wirkungsgrad, so daß die Verlustleistung gering ist und damit auch die Wärmemenge gering ist, die von der Pumpe 2 und ihrem Antrieb erzeugt wird. Jedenfalls wird die durch die laufende Pumpe 2 entstehende Wärme durch geeignete Maßnahmen von dem Kraftstofftank 1 abgekoppelt. Dazu könnten entsprechende wärmedämmende Maßnahmen durchgeführt werden, und zwar auch dann, wenn sich die Pumpe 2 mit ihrem Antrieb in dem Kraftstofftank 1 befindet. Nach bevorzugter Ausführungsform der Erfindung und im Ausführungsbeispiel ist die Pumpe 2 mit ihrem Antrieb jedoch außerhalb des Kraftstofftanks 1 angeordnet und folglich ist die durch die laufende Pumpe 2 entstehende Wärme auf diese Weise von dem Kraftstofftank 1 abgekoppelt.The fuel tank 1, the flow line system 3, the Injection bar 4 and the return line system 5, preferably including the overflow valve 7 insulated, in the embodiment through a coating 8. But you could also do vacuum insulation or the like. Apply. The overflow valve 7 is via a starter control device 9 for the gasoline engine and / or the pressure of the pump 2 when the Gasoline engine controllable in open position. The pump 2 has a very high efficiency, so the power loss is small and thus the amount of heat is also small is generated by the pump 2 and its drive. In any case is the heat generated by the running pump 2 by suitable measures uncoupled from the fuel tank 1. Appropriate thermal insulation measures could be used be carried out, even if the Pump 2 is located in the fuel tank 1 with its drive. According to a preferred embodiment of the invention and in The exemplary embodiment is the pump 2 with its drive however arranged outside the fuel tank 1 and consequently, the one created by the running pump 2 Heat decoupled from the fuel tank 1 in this way.

Da eine Kraftstoffumwälzung nicht mehr stattfindet, muß die Kraftstoffzuführung entsprechend eingerichtet werden. Eine Möglichkeit besteht darin, die Anordnung und Auslegung so zu treffen, daß die Pumpe 2 bei laufendem Ottomotor und allen Betriebsbedingungen in der Einspritzleiste 4 einen konstanten statischen Kraftstoffdruck aufrechterhält. Soll über den Druck des Kraftstoffes bei Inbetriebnahme des Ottomotors das Überströmventil 7 kurzzeitig geöffnet werden, so erzeugt die Pumpe 2 einen entsprechenden Druckimpuls, der unmittelbar oder mittelbar für die Steuerung des Überströmventils 7 ausgenutzt werden kann. Es besteht aber auch die Möglichkeit, die Pumpe 2 an eine Steuer- oder Regeleinrichtung 10 anzuschließen, welche die Fördermenge und/oder den Abgabedruck der Pumpe 2 in Abhängigkeit von der Drehzahl des Ottomotors steuert.Since fuel circulation no longer takes place, the Fuel supply can be set up accordingly. A Possibility is the arrangement and interpretation so to make sure that the pump 2 with the gasoline engine running and all operating conditions in the injection bar 4 one maintains constant static fuel pressure. Should about the pressure of the fuel when the Otto engine overflow valve 7 briefly opened are, the pump 2 generates a corresponding Pressure pulse that is directly or indirectly for the Control of the overflow valve 7 can be used. It but there is also the possibility of pump 2 to one Control or regulating device 10 to connect the Delivery rate and / or the delivery pressure of the pump 2 in Controls depending on the speed of the gasoline engine.

Die Bauteile Kraf stofftank 1, Vorlaufleitungssystem 3, Rücklaufleitungssystem 5 bestehen zweckmäßigerweise aus Kunststoff. Hier besteht die Möglichkeit, die Bauteile mit einer wärmedämmenden Beschichtung 8 aus Wärmedämm-Kunststoff zu versehen, die stoffschlüssig mit den Bauteilen verbunden ist, wie es das Ausführungsbeispiel andeutet.The components fuel tank 1, flow line system 3, Return line system 5 advantageously consist of Plastic. Here it is possible to use the components a thermally insulating coating 8 made of thermally insulating plastic to provide the cohesive with the components is connected, as the embodiment suggests.

In der Fig. 2 erkennt man das erfindungsgemäße Kraftstoff-Versorgungssystem für ein Kraftfahrzeug mit Ottomotor, der ein Kraftstoffeinspritzsystem mit Einspritzleiste 4 aufweist, und welches grundsätzlich wie zur Fig. 1 beschrieben aufgebaut ist, jedoch ein Rücklaufleitungssystem 5 von der Einspritzleiste 4 zum Kraftstofftank 1 nicht aufweist. Hier ist lediglich der Kraftstofftank 1 wärmedämmend isoliert. Die Pumpe 2 ist mit ihrem Antrieb außerhalb des Kraftstofftanks 1 angeordnet. Die Pumpe 2 ist an eine Steuer- oder Regeleinrichtung 10 angeschlossen, welche den Abgabedruck der Pumpe 2 in Abhängigkeit von der Drehzahl des Ottomotors steuert. Insoweit erfolgt über diese Steuerung eine bedarfsabhängige Kraftstoffzufuhr. Es besteht aber auch die Möglichkeit, das in der Fig. 2 dargestellte Kraftstoff-Versorgungssystem zusätzlich mit einem Rücklaufleitungssystem mit Überströmventil zu versehen, welches in der schon erläuterten Art und Weise lediglich kurzzeitig bei Inbetriebnahme des Ottomotors in Offenstellung steuerbar ist. Es kann wärmedämmend isoliert sein.2 shows the invention Fuel supply system for a motor vehicle with Otto engine, which is a fuel injection system with fuel rail 4, and which basically as for FIG. 1 is constructed, but a return line system 5 from the injection bar 4 to the fuel tank 1 does not have. Here is just the fuel tank 1 insulated. The pump 2 is with her Drive arranged outside of the fuel tank 1. The Pump 2 is connected to a control or regulating device 10 connected, which the discharge pressure of the pump 2 in Controls depending on the speed of the gasoline engine. To this extent, this control is based on demand Fuel supply. But there is also the possibility that shown in Fig. 2 fuel supply system additionally with a return line system To provide overflow valve, which is already in the explained only briefly Commissioning of the gasoline engine controllable in open position is. It can be thermally insulated.

Claims (9)

  1. A fuel supply system for a motor vehicle with a spark-ignition engine, which comprises a fuel injection system with an injection unit (4), - having a fuel tank (1), a pump (2), a flow line system (3) from the fuel tank (1) to the injection unit (4), and a return line system (5) from the injection unit (4) to the fuel tank (1), wherein the return line system (5) is attached to the injection unit (4) via a means for pressure regulation,
    wherein the pump (2), the flow line system (3) and the injection unit (4) form a fuel supply device, the pump (2) of which delivers according to the different operating conditions of the spark-ignition engine when the latter is running, wherein the fuel tank is provided with a venting device and is otherwise separated from the free atmosphere, characterised in that
    the means for pressure regulation is a controllable overflow valve (7), which overflow valve (7) can be set to the open position merely momentarily when the spark-ignition engine is started, via a starting control device (9) for the spark-ignition engine and/or via the pressure of the pump (2),
    and that at least the fuel tank (1), the flow line system (3) and the injection unit (4) are thermally insulated.
  2. A fuel supply system according to claim 1, characterised in that the pump (2) has an efficiency higher than 80 % and thereby has a reduced power loss.
  3. A fuel supply system according to either one of claims 1 or 2, characterised in that the heat generated by the working pump (2) is isolated from the fuel tank (1).
  4. A fuel supply system according to any one of claims 1 to 3, characterised in that the pump (2) is disposed outside the fuel tank (1).
  5. A fuel supply system according to any one of claims 1 to 4, characterised in that when the spark-ignition engine is running the pump (2) maintains a constant static fuel pressure in the injection unit (4) under all operating conditions.
  6. A fuel supply system according to any one of claims 1 to 4, characterised in that the pump (2) is attached to a control or regulating device (10) which controls the amount delivered by and/or the delivery pressure of the pump (2) depending on the speed of the spark-ignition engine.
  7. A fuel supply system according to any one of claims 1 to 6, characterised in that the fuel tank (1), flow line system (3) and return line system (5) components consist of synthetic material.
  8. A fuel supply system according to claim 7, characterised in that the components have a thermally insulating coating of thermally insulating synthetic material, which is joined to the components by a material bond.
  9. A fuel supply system for a motor vehicle with a spark-ignition engine, which comprises a fuel injection system with an injection unit (4), - having a fuel tank (1), a pump (2), a flow line system (3) from the fuel tank (1) to the injection unit (4), and a return line system (5) from the injection unit (4) to the fuel tank (1), wherein the return line system (5) is attached to the injection unit (4) via a means for pressure regulation, wherein the pump (2) is attached to a control or regulating device (10) which controls the amount delivered by and/or the delivery pressure of the pump depending on the speed and/or on the fuel consumption of the spark-ignition engine, wherein the fuel tank (1) is provided with a venting device (6) and is otherwise separated from the free atmosphere, characterised in that
    the fuel tank (1) is thermally insulated and the pump (2) is disposed outside the fuel tank (1), and that the means for pressure regulation is a controllable overflow valve (7), which overflow valve (7) can be set to the open position merely momentarily when the spark-ignition engine is started.
EP94118841A 1993-12-28 1994-11-30 Fuel supply system for a vehicle with Otto engine Expired - Lifetime EP0661437B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4344777 1993-12-28
DE4344777A DE4344777C2 (en) 1993-12-28 1993-12-28 Fuel supply system for a motor vehicle with a gasoline engine

Publications (2)

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EP0661437A1 EP0661437A1 (en) 1995-07-05
EP0661437B1 true EP0661437B1 (en) 1998-01-21

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US (1) US5584279A (en)
EP (1) EP0661437B1 (en)
JP (1) JP2651125B2 (en)
BR (1) BR9405275A (en)
DE (2) DE4344777C2 (en)
ES (1) ES2114120T3 (en)

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EP0661437A1 (en) 1995-07-05
JP2651125B2 (en) 1997-09-10
ES2114120T3 (en) 1998-05-16
DE4344777C2 (en) 1998-06-04
JPH084616A (en) 1996-01-09
US5584279A (en) 1996-12-17
DE4344777A1 (en) 1995-06-29
DE59405099D1 (en) 1998-02-26
BR9405275A (en) 1995-09-19

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