EP1126157A2 - Fuel supply device for a combustion engine of a vehicle - Google Patents

Fuel supply device for a combustion engine of a vehicle Download PDF

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Publication number
EP1126157A2
EP1126157A2 EP00127411A EP00127411A EP1126157A2 EP 1126157 A2 EP1126157 A2 EP 1126157A2 EP 00127411 A EP00127411 A EP 00127411A EP 00127411 A EP00127411 A EP 00127411A EP 1126157 A2 EP1126157 A2 EP 1126157A2
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EP
European Patent Office
Prior art keywords
fuel
pressure
supply device
combustion engine
pressure sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00127411A
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German (de)
French (fr)
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EP1126157A3 (en
EP1126157B1 (en
Inventor
Klaus Joos
Jens Wolber
Thomas Frenz
Markus Amler
Hansjoerg Bochum
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1126157A2 publication Critical patent/EP1126157A2/en
Publication of EP1126157A3 publication Critical patent/EP1126157A3/en
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Publication of EP1126157B1 publication Critical patent/EP1126157B1/en
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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
    • 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
    • F02M37/02—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

Definitions

  • the invention is based on one Fuel supply device for an internal combustion engine of a motor vehicle according to the preamble of claim 1.
  • Such a fuel supply device is through the DE 28 08 731 C2 known.
  • This Fuel supply device has an electric motor driven delivery unit through which the fuel a reservoir to an injection system Internal combustion engine is promoted.
  • a Pressure sensor provided by the fuel pressure is detected downstream of the conveyor unit.
  • the Pressure sensor is connected to a control device through the operation of the electric motor of the conveyor unit in such a way is controlled that the fuel pressure downstream of the Conveyor unit at least approximately equal to one predetermined target pressure is.
  • Through the conveyor unit here only the amount of fuel promoted by the Internal combustion engine is consumed so that none Return flow from the internal combustion engine into the Storage container back is available.
  • Downstream of the Pressure sensor is a throttled flow, so that when operating the conveyor unit, a subset of the this delivered fuel is derived.
  • the delivery unit does not yet provide the internal combustion engine the full delivery rate, with a subset of the Conveyed fuel pumped by the throttled flow is derived, so under certain circumstances the amount of fuel supplied to the internal combustion engine is not is sufficient.
  • the fuel supply device with the features according to claim 1, in contrast, has the advantage that the throttled flow through the valve device only is opened when the fuel pressure is at least approximately has reached the predetermined target pressure, so that in particular at and after the start the whole of the conveyor unit delivered amount of fuel to the internal combustion engine becomes.
  • the valve device ensured that when the internal combustion engine is turned off throttled drain is closed and the fuel pressure in the injection system at least approximately on the predetermined target pressure is maintained. If it is at turned off internal combustion engine due to heating of the If the fuel comes to an increase in pressure, this can be relieved by the valve device.
  • Training according to claim 3 has the advantage that by the Pressure sensor the actual fuel pressure in the Injection system is detected, for example as a result contamination of the fuel filter may be less than the fuel pressure upstream of the fuel filter.
  • FIG. 1 shows a Fuel supply device for an internal combustion engine of a motor vehicle in a schematic representation.
  • a fuel supply device for An internal combustion engine 10 of a motor vehicle is shown.
  • the internal combustion engine 10 has an injection system, through the fuel in the cylinders of the internal combustion engine is injected.
  • the motor vehicle has one Fuel tank 12 in which the Fuel supply device arranged substantially is.
  • the fuel supply device has one Conveyor unit 14, which has an electric motor 16 as a drive by which a pump part 18 is driven.
  • the Electric motor 14 and the pump part 18 are in one common housing 20 arranged.
  • a check valve 22 is integrated, for example in a discharge port 24 leading away from the housing 20 is arranged.
  • the check valve 22 opens in Delivery direction of the delivery unit 14 to the internal combustion engine 10 back and closes in the opposite direction, so that from the engine 10 no fuel in the Conveyor unit 14 can flow back.
  • a pressure relief valve 26 is also integrated, which is arranged upstream of the check valve 22.
  • the pressure relief valve 26 is at an opening pressure set, which is much higher than that usually and if the components of the Fuel supply device downstream of the Delivery unit 14 occurring fuel pressure. Provided by Disorders such as constipation or Kinking of lines, the fuel pressure rises sharply, so opens the pressure relief valve 26 and from Delivery unit 14 delivered fuel in the Flow back reservoir 12 so that damage the conveyor unit 14 or the line 30 is avoided.
  • the pressure relief valve 26 can for example be one Opening pressure between about 6 and 8 bar.
  • the conveyor unit 14 is preferably in one Storage container 28 arranged in the storage container 12 is inserted and opposite the reservoir 12 has much smaller volume.
  • the Storage container 28 is preferably by means of a Suction jet pump 29 fuel from the reservoir 12 promoted.
  • the reservoir 12 can be several from each other have separate chambers, fuel from or several chambers of the reservoir 12 into the chamber is promoted, in which the conveyor unit 14 is arranged.
  • a Fuel filter 32 Downstream of the Fuel filter 32 is a pressure sensor 34 in line 30 arranged through which the fuel pressure in line 30 downstream of the fuel filter 32 is detected.
  • the Pressure sensor 34 is electronic Control device 36 connected in which the signals of the Pressure sensor 34 in a manner explained in more detail below are processed.
  • the fuel pressure in is controlled by the control device 36 the line 30 evaluated and with a predetermined Target pressure compared.
  • the target pressure can be constant or depending, for example, on operating parameters of the Internal combustion engine to be variable.
  • the control device 36 also regulates the operation of the electric motor 16 of the Conveying unit 14 such that the 14th a quantity of fuel is pumped that is required around line 30 downstream of fuel filter 32 a fuel pressure detected by the pressure sensor 34 generate that is at least approximately equal to the predetermined Target pressure is.
  • the control device 36 preferably the voltage and / or power supply of the Electric motor 16 of the delivery unit 14 clocked, for what a Clock module 38 is provided.
  • the clock module 38 can the RMS value by varying the duty cycle the voltage applied to the electric motor 16 and / or the electric motor 16 supplied current can be changed, so that by the conveyor 14 to achieve the Required delivery pressure required volume is provided.
  • the frequency with which the electric motor 16 is clocked is preferably above an audible range of about 20kHz.
  • a valve device 40 Downstream of the pressure sensor 34 is a valve device 40 arranged through which a throttled outlet 42nd is controlled.
  • the valve device 40 can also be arranged upstream of the pressure sensor 34.
  • the Valve device 40 is a pressure relief valve that the Process depends on the fuel pressure in line 30 controls downstream of the pressure sensor 34.
  • the Valve device 40 is set such that this a fuel pressure in line 30 that opens something is less than the target pressure, which over the Control device 36 by appropriately controlled operation of the conveyor unit 14 is set.
  • the opening pressure the valve device 40 can for example be approximately 80% to 95% of the target pressure. If the target pressure is about 3 bar, for example, the opening pressure the valve device 40 be about 2.8 bar. If the If the target pressure is variable, the opening pressure is Valve device 40 set so that it something is below the lowest intended pressure.
  • the throttled flow 42 is designed such that a sufficiently large amount of fuel flows out of them. It is preferably provided that the suction jet pump 29 is on the drain 42 is connected so that through the drain 42 outflowing amount of fuel the amount of fuel for the Suction jet pump 29 is.
  • the suction jet pump 29 is a Line 44 connected to the outlet 42 and points in known manner on a nozzle 45 through which the jet emerges, and an opening 46 downstream of the nozzle 45, due to the additional fuel from the reservoir 12 enters and is conveyed into the storage container 28.
  • the Process 42 is designed such that the propellant quantity Suction jet pump 29 is sufficient to fill the Ensure storage container 28. It can also be two or more suction jet pumps 29 connected to the drain 42 his.
  • the valve device 40 also ensures that when the internal combustion engine is 10 and not operated conveyor 14 the drain is closed, so that in the injection system of the engine 10 sufficient fuel pressure is maintained.
  • the valve device 40 fulfills one Safety function by changing the fuel pressure in the Injection system of the internal combustion engine 10 is limited because when the opening pressure of the valve device is exceeded 40 the drain is opened.
  • An increase in Fuel pressure can, for example, in overrun mode Internal combustion engine in which no fuel is consumed, or if the fuel heats up after it has been switched off of the engine 10 occur.
  • the storage container 28 with the arranged therein Delivery unit 14, the fuel filter 32, the pressure sensor 34, the valve device 40 with the outlet 42 and the Clock module 38 are preferably one unit summarized outside the reservoir 12th assembled and as a unit in the Storage container 12 is used.
  • the unit can also a level sensor 48 for the level of the Have storage container 12. Through this training the assembly and wiring effort of the components of the Unit kept low. It is also advantageous that by the arrangement of the pressure sensor 34 in the structural unit with the delivery unit 14 a close coupling of the actuator and controlled system achieves what the stability of the scheme favored.

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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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

Die Kraftstoffversorgungseinrichtung weist ein elektromotorisch angetriebenes Förderaggregat (14) auf, durch das Kraftstoff aus einem Vorratsbehälter (12) zur Brennkaftmaschine (10) gefördert wird. In das Förderaggregat (14) sind ein Druckbegrenzungsventil (26) und ein Rückschlagventil (22) integriert. Stromabwärts des Förderaggregats (14) ist ein Kraftstoffilter (32) angeordnet und stromabwärts des Kraftstoffilters (32) ist ein Drucksensor (34) angeordnet. Der Drucksensor (34) ist mit einer Steuereinrichtung (36) verbunden, durch die der Betrieb des Förderaggregats (14) derart gesteuert wird, daß der Kraftstoffdruck zumindest annähernd gleich einem Solldruck ist. Stromabwärts des Drucksensors (34) ist ein gedrosselter Ablauf (42) vorgesehen, der durch eine Ventileinrichtung (40) druckabhängig derart gesteuert wird, daß der Ablauf (42) bei Überschreiten eines etwas unterhalb des Solldrucks liegenden Kraftstoffdrucks öffnet. An den Ablauf (42) ist wenigstens eine Saugstrahlpumpe (29) angeschlossen. <IMAGE>The fuel supply device has a delivery unit (14) driven by an electric motor, through which fuel is delivered from a storage container (12) to the fuel press (10). A pressure limiting valve (26) and a check valve (22) are integrated in the delivery unit (14). A fuel filter (32) is arranged downstream of the delivery unit (14) and a pressure sensor (34) is arranged downstream of the fuel filter (32). The pressure sensor (34) is connected to a control device (36) by means of which the operation of the delivery unit (14) is controlled in such a way that the fuel pressure is at least approximately equal to a target pressure. Downstream of the pressure sensor (34) there is a throttled outlet (42) which is controlled by a valve device (40) in a pressure-dependent manner in such a way that the outlet (42) opens when a fuel pressure slightly below the target pressure is exceeded. At least one suction jet pump (29) is connected to the outlet (42). <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoffversorgungseinrichtung für eine Brennkraftmaschine eines Kraftfahrzeugs nach der Gattung des Anspruchs 1.The invention is based on one Fuel supply device for an internal combustion engine of a motor vehicle according to the preamble of claim 1.

Eine solche Kraftstoffversorgungseinrichtung ist durch die DE 28 08 731 C2 bekannt. Diese Kraftstoffversorgungseinrichtung weist ein elektromotorisch angetriebenes Förderaggregat auf, durch das Kraftstoff aus einem Vorratsbehälter zu einer Einspritzanlage der Brennkraftmaschine gefördert wird. Außerdem ist ein Drucksensor vorgesehen, durch den der Kraftstoffdruck stromabwärts des Förderaggregats erfaßt wird. Der Drucksensor ist mit einer Steuereinrichtung verbunden, durch die der Betrieb des Elektromotors des Förderaggregats derart gesteuert wird, daß der Kraftstoffdruck stromabwärts des Förderaggregats zumindest annähernd gleich einem vorgegebenen Solldruck ist. Durch das Förderaggregat wird hierbei nur die Kraftstoffmenge gefördert, die von der Brennkraftmaschine verbraucht wird, so daß keine Rücklaufmenge von der Brennkraftmaschine in den Vorratsbehälter zurück vorhanden ist. Stromabwärts des Drucksensors ist ein gedrosselter Ablauf vorhanden, so daß beim Betrieb des Förderaggregats eine Teilmenge des von dieser geförderten Kraftstoffs abgeleitet wird. Dies ermöglicht einen Betrieb des Förderaggregats auch dann, wenn der Kraftstoffbedarf der Brennkraftmaschine sehr gering ist. Insbesondere während und nach dem Starten der Brennkraftmaschine erbringt das Förderaggregat noch nicht die volle Förderleistung, wobei eine Teilmenge des vom Förderaggregat geförderten Kraftstoffs durch den gedrosselten Ablauf abgeleitet wird, so daß unter Umständen die der Brennkraftmaschine zugeführte Kraftstoffmenge nicht ausreichend ist. Darüberhinaus kann durch den gedrosselten Ablauf bei abgestellter Brennkraftmaschine Kraftstoff abfließen, so daß der Kraftstoffdruck in der Einspritzanlage der Brennkraftmaschine sinkt.Such a fuel supply device is through the DE 28 08 731 C2 known. This Fuel supply device has an electric motor driven delivery unit through which the fuel a reservoir to an injection system Internal combustion engine is promoted. In addition, is a Pressure sensor provided by the fuel pressure is detected downstream of the conveyor unit. The Pressure sensor is connected to a control device through the operation of the electric motor of the conveyor unit in such a way is controlled that the fuel pressure downstream of the Conveyor unit at least approximately equal to one predetermined target pressure is. Through the conveyor unit here only the amount of fuel promoted by the Internal combustion engine is consumed so that none Return flow from the internal combustion engine into the Storage container back is available. Downstream of the Pressure sensor is a throttled flow, so that when operating the conveyor unit, a subset of the this delivered fuel is derived. This enables operation of the conveyor unit even if the fuel requirement of the internal combustion engine is very low. Especially during and after starting the The delivery unit does not yet provide the internal combustion engine the full delivery rate, with a subset of the Conveyed fuel pumped by the throttled flow is derived, so under certain circumstances the amount of fuel supplied to the internal combustion engine is not is sufficient. In addition, can be throttled by the Sequence when the internal combustion engine is switched off drain off so that the fuel pressure in the injection system the internal combustion engine sinks.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffversorgungseinrichtung mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, daß durch die Ventileinrichtung der gedrosselte Ablauf erst geöffnet wird, wenn der Kraftstoffdruck zumindest annähernd den vorgegebenen Solldruck erreicht hat, so daß insbesondere zum und nach dem Start die gesamte vom Förderaggregat geförderte Kraftstoffmenge zur Brennkraftmaschine gefördert wird. Außerdem ist durch die Ventileinrichtung sichergestellt, daß bei abgestellter Brennkraftmaschine der gedrosselte Ablauf geschlossen wird und der Kraftstoffdruck in der Einspritzanlage zumindest annähernd auf dem vorgegebenen Solldruck gehalten wird. Wenn es bei abgestellter Brennkraftmaschine infolge einer Erwärmung des Kraftstoffs zu einem Druckanstieg kommt, so kann dieser durch die Ventileinrichtung entlastet werden.The fuel supply device according to the invention with the features according to claim 1, in contrast, has the advantage that the throttled flow through the valve device only is opened when the fuel pressure is at least approximately has reached the predetermined target pressure, so that in particular at and after the start the whole of the conveyor unit delivered amount of fuel to the internal combustion engine becomes. In addition, through the valve device ensured that when the internal combustion engine is turned off throttled drain is closed and the fuel pressure in the injection system at least approximately on the predetermined target pressure is maintained. If it is at turned off internal combustion engine due to heating of the If the fuel comes to an increase in pressure, this can be relieved by the valve device.

In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Kraftstoffversorgungseinrichtung angegeben. Die Ausbildung gemäß Anspruch 3 bietet den Vorteil, daß durch den Drucksensor der tatsächliche Kraftstoffdruck in der Einspritzanlage erfaßt wird, der beispielsweise infolge einer Verschmutzung des Kraftstoffilters geringer sein kann als der Kraftstoffdruck stromaufwärts des Kraftstoffilters.In the dependent claims are advantageous Refinements and developments of the invention Fuel supply device specified. Training according to claim 3 has the advantage that by the Pressure sensor the actual fuel pressure in the Injection system is detected, for example as a result contamination of the fuel filter may be less than the fuel pressure upstream of the fuel filter.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Kraftstoffversorgungseinrichtung für eine Brennkraftmaschine eines Kraftfahrzeugs in schematischer Darstellung.An embodiment of the invention is in the drawing shown and in the following description explained. 1 shows a Fuel supply device for an internal combustion engine of a motor vehicle in a schematic representation.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In der Figur ist eine Kraftstoffversorgungseinrichtung für eine Brennkraftmaschine 10 eines Kraftfahrzeugs dargestellt. Die Brennkraftmaschine 10 weist eine Einspritzanlage auf, durch die Kraftstoff in die Zylinder der Brennkraftmaschine eingespritzt wird. Das Kraftfahrzeug weist einen Kraftstoffvorratsbehälter 12 auf, in dem die Kraftstoffversorgungseinrichtung im wesentlichen angeordnet ist. Die Kraftstoffversorgungseinrichtung weist ein Förderaggregat 14 auf, das einen Elektromotor 16 als Antrieb aufweist, durch den ein Pumpenteil 18 angetrieben wird. Der Elektromotor 14 und der Pumpenteil 18 sind in einem gemeinsamen Gehäuse 20 angeordnet. In das Förderaggregat 14 ist ein Rückschlagventil 22 integriert, das beispielsweise in einem vom Gehäuse 20 abführenden Druckstutzen 24 angeordnet ist. Das Rückschlagventil 22 öffnet in Förderrichtung des Förderaggregats 14 zur Brennkraftmaschine 10 hin und schließt in entgegengesetzter Richtung, so daß von der Brennkraftmaschine 10 kein Kraftstoff in das Förderaggregat 14 zurückfließen kann. In das Förderaggregat 14 ist außerdem ein Druckbegrenzungsventil 26 integriert, das stromaufwärts des Rückschlagventils 22 angeordnet ist. Das Druckbrenzungsventil 26 ist auf einen Öffnungsdruck eingestellt, der wesentlich höher ist, als der üblicherweise und bei korrekter Funktion der Komponenten der Kraftstoffversorgungseinrichtung stromabwärts des Förderaggregats 14 auftretende Kraftstoffdruck. Sofern durch Störungen, wie beispielsweise eine Verstopfung oder Abknicken von Leitungen, der Kraftstoffdruck stark ansteigt, so öffnet das Druckbegrenzungsventil 26 und läßt vom Förderaggregat 14 geförderten Kraftstoff in den Vorratsbehälter 12 zurückfließen, so daß eine Beschädigung des Förderaggregats 14 oder der Leitung 30 vermieden wird. Das Druckbegrenzungsventil 26 kann beispielsweise auf einen Öffnungsdruck zwischen etwa 6 und 8 bar eingestellt sein.In the figure is a fuel supply device for An internal combustion engine 10 of a motor vehicle is shown. The internal combustion engine 10 has an injection system, through the fuel in the cylinders of the internal combustion engine is injected. The motor vehicle has one Fuel tank 12 in which the Fuel supply device arranged substantially is. The fuel supply device has one Conveyor unit 14, which has an electric motor 16 as a drive by which a pump part 18 is driven. The Electric motor 14 and the pump part 18 are in one common housing 20 arranged. In the conveyor 14 a check valve 22 is integrated, for example in a discharge port 24 leading away from the housing 20 is arranged. The check valve 22 opens in Delivery direction of the delivery unit 14 to the internal combustion engine 10 back and closes in the opposite direction, so that from the engine 10 no fuel in the Conveyor unit 14 can flow back. In the conveyor unit 14, a pressure relief valve 26 is also integrated, which is arranged upstream of the check valve 22. The pressure relief valve 26 is at an opening pressure set, which is much higher than that usually and if the components of the Fuel supply device downstream of the Delivery unit 14 occurring fuel pressure. Provided by Disorders such as constipation or Kinking of lines, the fuel pressure rises sharply, so opens the pressure relief valve 26 and from Delivery unit 14 delivered fuel in the Flow back reservoir 12 so that damage the conveyor unit 14 or the line 30 is avoided. The pressure relief valve 26 can for example be one Opening pressure between about 6 and 8 bar.

Das Förderaggregat 14 ist vorzugsweise in einem Speicherbehälter 28 angeordnet, der in den Vorratsbehälter 12 eingesetzt ist und gegenüber dem Vorratsbehälter 12 ein wesentlich kleineres Volumen besitzt. In den Speicherbehälter 28 wird vorzugsweise mittels einer Saugstrahlpumpe 29 Kraftstoff aus dem Vorratsbehälter 12 gefördert. Der Vorratsbehälter 12 kann mehrere voneinander getrennte Kammern aufweisen, wobei Kraftstoff aus einer oder mehreren Kammern des Vorratsbehälters 12 in die Kammer gefördert wird, in der das Förderaggregat 14 angeordnet ist.The conveyor unit 14 is preferably in one Storage container 28 arranged in the storage container 12 is inserted and opposite the reservoir 12 has much smaller volume. In the Storage container 28 is preferably by means of a Suction jet pump 29 fuel from the reservoir 12 promoted. The reservoir 12 can be several from each other have separate chambers, fuel from or several chambers of the reservoir 12 into the chamber is promoted, in which the conveyor unit 14 is arranged.

Von der Druckseite des Förderaggregats 14 führt zur Brennkraftmaschine 10 eine Leitung 30 ab, in der ein Kraftstoffilter 32 angeordnet ist. Stromabwärts des Kraftstoffilters 32 ist in der Leitung 30 ein Drucksensor 34 angeordnet, durch den der Kraftstoffdruck in der Leitung 30 stromabwärts des Kraftstoffilters 32 erfaßt wird. Der Drucksensor 34 ist mit einer elektronischen Steuereinrichtung 36 verbunden, in der die Signale des Drucksensors 34 in nachfolgend noch näher erläuterter Weise verarbeitet werden. Durch den Drucksensor 34 wird der tatsächlich in der Einspritzanlage der Brennkraftmaschine 10 herrschende Kraftstoffdruck erfaßt, der beispielsweise infolge einer Verschmutzung des Kraftstoffilters 32 geringer sein kann als der Kraftstoffdruck stromaufwärts des Kraftstoffilters 32.From the pressure side of the delivery unit 14 leads to Internal combustion engine 10 from a line 30 in which a Fuel filter 32 is arranged. Downstream of the Fuel filter 32 is a pressure sensor 34 in line 30 arranged through which the fuel pressure in line 30 downstream of the fuel filter 32 is detected. The Pressure sensor 34 is electronic Control device 36 connected in which the signals of the Pressure sensor 34 in a manner explained in more detail below are processed. By the pressure sensor 34 actually in the injection system of the internal combustion engine 10 prevailing fuel pressure is detected, for example due to contamination of the fuel filter 32 less can be as the fuel pressure upstream of the Fuel filter 32.

Durch die Steuereinrichtung 36 wird der Kraftstoffdruck in der Leitung 30 ausgewertet und mit einem vorgegebenen Solldruck verglichen. Der Solldruck kann dabei konstant sein oder abhängig beispielsweise von Betriebsparametern der Brennkraftmaschine variabel sein. Die Steuereinrichtung 36 regelt außerdem den Betrieb des Elektromotors 16 des Förderaggregats 14 derart, daß durch das Förderaggregat 14 eine Kraftstoffmenge gefördert wird, die erforderlich ist, um in der Leitung 30 stromabwärts des Krafstoffilters 32 einen vom Drucksensor 34 erfaßten Kraftstoffdruck zu erzeugen, der zumindest annähernd gleich dem vorgegebenen Solldruck ist. Durch die Steuereinrichtung 36 wird vorzugsweise die Spannungs- und/oder Stromversorgung des Elektromotors 16 des Förderaggregats 14 getaktet, wozu ein Taktmodul 38 vorgesehen ist. Durch das Taktmodul 38 kann durch eine Variation des Tastverhältnisses der Effektivwert der an den Elektromotor 16 angelegten Spannung und/oder des dem Elektromotor 16 zugeführten Stroms verändert werden, so daß durch das Förderaggregat 14 die zur Erreichung des Solldrucks erforderliche Fördermenge bereitgestellt wird. Die Frequenz mit der der Elektromotor 16 getaktet betrieben wird, liegt vorzugsweise oberhalb eines hörbaren Bereichs von etwa 20kHz.The fuel pressure in is controlled by the control device 36 the line 30 evaluated and with a predetermined Target pressure compared. The target pressure can be constant or depending, for example, on operating parameters of the Internal combustion engine to be variable. The control device 36 also regulates the operation of the electric motor 16 of the Conveying unit 14 such that the 14th a quantity of fuel is pumped that is required around line 30 downstream of fuel filter 32 a fuel pressure detected by the pressure sensor 34 generate that is at least approximately equal to the predetermined Target pressure is. Through the control device 36 preferably the voltage and / or power supply of the Electric motor 16 of the delivery unit 14 clocked, for what a Clock module 38 is provided. Through the clock module 38 can the RMS value by varying the duty cycle the voltage applied to the electric motor 16 and / or the the electric motor 16 supplied current can be changed, so that by the conveyor 14 to achieve the Required delivery pressure required volume is provided. The frequency with which the electric motor 16 is clocked is preferably above an audible range of about 20kHz.

Stromabwärts des Drucksensors 34 ist eine Ventileinrichtung 40 angeordnet, durch die ein gedrosselter Ablauf 42 gesteuert wird. Die Ventileinrichtung 40 kann auch stromaufwärts des Drucksensors 34 angeordnet sein. Die Ventileinrichtung 40 ist ein Druckbegrenzungsventil, das den Ablauf abhängig vom Kraftstoffdruck in der Leitung 30 stromabwärts des Drucksensors 34 steuert. Die Ventileinrichtung 40 ist derart eingestellt, daß diese bei einem Kraftstoffdruck in der Leitung 30 öffnet, der etwas geringer ist als der Solldruck, der über die Steuereinrichtung 36 durch entsprechend gesteuerten Betrieb des Förderaggregats 14 eingestellt wird. Der Öffnungsdruck der Ventileinrichtung 40 kann beispielsweise etwa 80% bis 95% des Solldrucks betragen. Wenn der Solldruck beispielsweise etwa 3 bar beträgt, so kann der Öffnungsdruck der Ventileinrichtung 40 etwa 2,8 bar betragen. Wenn der Solldruck variabel ist, so ist der Öffnungsdruck der Ventileinrichtung 40 derart eingestellt, daß er etwas unterhalb des geringsten vorgesehenen Solldrucks liegt.Downstream of the pressure sensor 34 is a valve device 40 arranged through which a throttled outlet 42nd is controlled. The valve device 40 can also be arranged upstream of the pressure sensor 34. The Valve device 40 is a pressure relief valve that the Process depends on the fuel pressure in line 30 controls downstream of the pressure sensor 34. The Valve device 40 is set such that this a fuel pressure in line 30 that opens something is less than the target pressure, which over the Control device 36 by appropriately controlled operation of the conveyor unit 14 is set. The opening pressure the valve device 40 can for example be approximately 80% to 95% of the target pressure. If the target pressure is about 3 bar, for example, the opening pressure the valve device 40 be about 2.8 bar. If the If the target pressure is variable, the opening pressure is Valve device 40 set so that it something is below the lowest intended pressure.

Beim Starten der Brennkraftmaschine 10 ist ein großer Kraftstoffbedarf vorhanden, wobei jedoch das Förderaggregat 14 je nach Spannung des Bordnetzes des Kraftfahrzeugs unter Umständen noch nicht die volle Förderleistung erreicht. Wenn der Kraftstoffdruck in der Leitung 30 noch nicht den Solldruck erreicht, so wird der Elektromotor 16 des Förderaggregats 14 durch die Steuereinrichtung 36 mit der vollen Spannung betrieben. Solange der Kraftstoffdruck noch deutlich unterhalb des Solldrucks liegt, wird der gedrosselte Ablauf 42 durch die Ventileinrichtung 40 geschlossen gehalten, so daß die gesamte vom Förderaggregat 14 geförderte Kraftstoffmenge zur Brennkraftmaschine gelangt. Erst wenn der Kraftstoffdruck annähernd den vorgegebenen Solldruck erreicht hat, wird durch die Ventileinrichtung 40 der gedrosselte Ablauf 42 geöffnet. Wenn der Kraftstoffdruck während des Betriebs des Förderaggregats 14 den Solldruck erreicht hat, so ist der Ablauf 42 durch die Ventileinrichtung 40 dauernd geöffnet, so daß Kraftstoff durch den Ablauf 42 abfließt. When starting the engine 10 is a big one There is a fuel requirement, but the delivery unit 14 depending on the voltage of the vehicle electrical system Under certain circumstances the full delivery rate has not yet been reached. If the fuel pressure in line 30 is not yet Target pressure is reached, the electric motor 16 of the Conveyor unit 14 by the control device 36 with the operated at full voltage. As long as the fuel pressure is still there is significantly below the target pressure restricted flow 42 through the valve device 40 kept closed so that the whole of the conveyor 14 amount of fuel delivered to the internal combustion engine reached. Only when the fuel pressure is close to has reached the specified target pressure, the The valve device 40 of the throttled outlet 42 opens. If the fuel pressure during the operation of the Delivery unit 14 has reached the target pressure, is the Drain 42 continuously opened by valve device 40, so that fuel flows through the outlet 42.

Der gedrosselte Ablauf 42 ist derart ausgelegt, daß durch diesen eine ausreichend große Kraftstoffmenge abfließt. Vorzugsweise ist vorgesehen, daß die Saugstrahlpumpe 29 an den Ablauf 42 angeschlossen ist, so daß die durch den Ablauf 42 abfließende Kraftstoffmenge die Treibmenge für die Saugstrahlpumpe 29 ist. Die Saugstrahlpumpe 29 ist über eine Leitung 44 mit dem Ablauf 42 verbunden und weist in bekannter Weise eine Düse 45 auf, durch die der Treibstrahl austritt, und eine der Düse 45 nachgeordnete Öffnung 46, durch die zusätzlicher Kraftstoff aus dem Vorratsbehälter 12 eintritt und in den Speicherbehälter 28 gefördert wird. Der Ablauf 42 ist derart ausgelegt, daß die Treibmenge der Saugstrahlpumpe 29 ausreicht, um eine Füllung des Speicherbehälters 28 sicherzustellen. Es können auch zwei oder mehr Saugstrahlpumpen 29 an den Ablauf 42 angeschlossen sein.The throttled flow 42 is designed such that a sufficiently large amount of fuel flows out of them. It is preferably provided that the suction jet pump 29 is on the drain 42 is connected so that through the drain 42 outflowing amount of fuel the amount of fuel for the Suction jet pump 29 is. The suction jet pump 29 is a Line 44 connected to the outlet 42 and points in known manner on a nozzle 45 through which the jet emerges, and an opening 46 downstream of the nozzle 45, due to the additional fuel from the reservoir 12 enters and is conveyed into the storage container 28. The Process 42 is designed such that the propellant quantity Suction jet pump 29 is sufficient to fill the Ensure storage container 28. It can also be two or more suction jet pumps 29 connected to the drain 42 his.

Durch die Ventileinrichtung 40 ist außerdem sichergestellt, daß bei abgestellter Brennkraftmaschine 10 und nicht betriebenem Förderaggregat 14 der Ablauf geschlossen ist, so daß in der Einspritzanlage der Brennkraftmaschine 10 ein ausreichender Kraftstoffdruck aufrechterhalten wird. Darüberhinaus erfüllt die Ventileinrichtung 40 eine Sicherheitsfunktion, indem der Kraftstoffdruck in der Einspritzanlage der Brennkraftmaschine 10 begrenzt wird, da bei Überschreiten des Öffnungsdrucks der Ventileinrichtung 40 der Ablauf geöffnet wird. Eine Erhöhung des Kraftstoffdrucks kann beispielsweise im Schubbetrieb der Brennkraftmaschine, bei dem kein Kraftstoff verbraucht wird, oder bei einer Erwärmung des Kraftstoffs nach dem Abstellen der Brennkraftmaschine 10 auftreten.The valve device 40 also ensures that when the internal combustion engine is 10 and not operated conveyor 14 the drain is closed, so that in the injection system of the engine 10 sufficient fuel pressure is maintained. In addition, the valve device 40 fulfills one Safety function by changing the fuel pressure in the Injection system of the internal combustion engine 10 is limited because when the opening pressure of the valve device is exceeded 40 the drain is opened. An increase in Fuel pressure can, for example, in overrun mode Internal combustion engine in which no fuel is consumed, or if the fuel heats up after it has been switched off of the engine 10 occur.

Der Speicherbehälter 28 mit dem darin angeordneten Förderaggregat 14, dem Kraftstoffilter 32, dem Drucksensor 34, der Ventileinrichtung 40 mit dem Ablauf 42 sowie das Taktmodul 38 sind vorzugsweise zu einer Baueinheit zusammengefaßt, die außerhalb des Vorratsbehälters 12 zusammengebaut und als eine Baueinheit in den Vorratsbehälter 12 eingesetzt wird. Die Baueinheit kann außerdem auch einen Füllstandsgeber 48 für den Füllstand des Vorratsbehälters 12 aufweisen. Durch diese Ausbildung wird der Montage- und Verkabelungsaufwand der Komponenten der Baueinheit gering gehalten. Außerdem ist es vorteilhaft, daß durch die Anordnung des Drucksensors 34 in der Baueinheit mit dem Förderaggregat 14 eine enge Kopplung von Stellglied und Regelstrecke erreicht, was die Stabilität der Regelung begünstigt.The storage container 28 with the arranged therein Delivery unit 14, the fuel filter 32, the pressure sensor 34, the valve device 40 with the outlet 42 and the Clock module 38 are preferably one unit summarized outside the reservoir 12th assembled and as a unit in the Storage container 12 is used. The unit can also a level sensor 48 for the level of the Have storage container 12. Through this training the assembly and wiring effort of the components of the Unit kept low. It is also advantageous that by the arrangement of the pressure sensor 34 in the structural unit with the delivery unit 14 a close coupling of the actuator and controlled system achieves what the stability of the scheme favored.

Claims (5)

Kraftstoffversorgungseinrichtung für eine Brennkraftmaschine eines Kraftfahrzeugs mit einem elektromotorisch angetriebenen Förderaggregat (14), durch das Kraftstoff aus einem Vorratsbehälter (12) zu einer Einspritzanlage der Brennkraftmaschine (10) gefördert wird, mit einem Drucksensor (34), durch den der Kraftstoffdruck stromabwärts des Förderaggregats (14) erfaßt wird, mit einer mit dem Drucksensor (34) verbundenen Steuereinrichtung (36), durch die der Betrieb des Förderaggregats (14) derart gesteuert wird, daß der Kraftstoffdruck zumindest annähernd gleich einem Solldruck ist, und mit einem stromabwärts des Förderaggregats (14) angeordneten gedrosselten Ablauf (42), dadurch gekennzeichnet, daß der Ablauf (42) durch eine Ventileinrichtung (40) abhängig vom Kraftstoffdruck gesteuert wird, wobei die Ventileinrichtung (40) den Ablauf bei Überschreiten eines unterhalb des Solldrucks liegenden Kraftstoffdrucks öffnet, und daß in das Förderaggregat (14) ein Rückschlagventil (22) integriert ist.Fuel supply device for one Internal combustion engine of a motor vehicle with a electric motor driven conveyor unit (14), by the fuel from a reservoir (12) to one Injection system of the internal combustion engine (10) is promoted with a pressure sensor (34) through which the fuel pressure downstream of the conveyor unit (14) is detected with a control device (36) connected to the pressure sensor (34), through which the operation of the conveyor unit (14) such is controlled that the fuel pressure is at least approximately is equal to a target pressure, and with a downstream of the Conveying unit (14) arranged throttled outlet (42), characterized in that the drain (42) by a Valve device (40) depending on the fuel pressure is controlled, the valve device (40) the sequence if a pressure below the target pressure is exceeded Fuel pressure opens, and that in the delivery unit (14) a check valve (22) is integrated. Kraftstoffversorgungseinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Ventileinrichtung (40) den Ablauf (42) bei Überschreiten von etwa 80% bis 95% des Solldrucks öffnet. Fuel supply device according to claim 1, characterized characterized in that the valve device (40) the sequence (42) when about 80% to 95% of the target pressure is exceeded opens. Kraftstoffversorgungseinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zwischen dem Förderaggregat (14) und dem Drucksensor (34) ein Kraftstoffilter (32) angeordnet ist, so daß durch den Drucksensor (34) der Kraftstoffdruck stromabwärts des Kraftstoffilters (32) erfaßt wird.Fuel supply device according to claim 1 or 2, characterized in that between the conveyor unit (14) and a fuel filter (32) is arranged on the pressure sensor (34) is, so that the fuel pressure by the pressure sensor (34) downstream of the fuel filter (32) is detected. Kraftstoffversorgungseinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß in das Förderaggregat (14) stromaufwärts des Rückschlagventils (22) ein Druckbegrenzungsventil (26) integriert ist.Fuel supply device according to one of the claims 1 to 3, characterized in that in the conveyor unit (14) upstream of the check valve (22) Pressure relief valve (26) is integrated. Kraftstoffversorgungseinrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß an den Ablauf (42) wenigstens eine Saugstrahlpumpe (29) angeschlossen ist, durch die Kraftstoff zwischen verschiedenen Kammern des Vorratsbehälters (12) und/oder aus dem Vorratsbehälter (12) in einen Speicherbehälter (28) gefördert wird, aus dem das Förderaggregat (14) Kraftstoff ansaugt.Fuel supply device according to one of the preceding claims, characterized in that the Drain (42) at least one suction jet pump (29) is connected by the fuel between various chambers of the storage container (12) and / or the storage container (12) into a storage container (28) is promoted from which the delivery unit (14) fuel sucks.
EP00127411A 2000-02-15 2000-12-14 Fuel supply device for an internal combustion engine of a vehicle Expired - Lifetime EP1126157B1 (en)

Applications Claiming Priority (2)

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DE10006622A DE10006622A1 (en) 2000-02-15 2000-02-15 Device for supplying a motor vehicle's internal combustion engine with fuel has a feeder unit driven by an electric motor to feed fuel from a reservoir to an internal combustion engine, also pressure-limiting and reverse flow valves.
DE10006622 2000-02-15

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EP1126157A2 true EP1126157A2 (en) 2001-08-22
EP1126157A3 EP1126157A3 (en) 2002-03-20
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US6474310B2 (en) 2002-11-05
EP1126157A3 (en) 2002-03-20
KR20010082019A (en) 2001-08-29
JP2001254655A (en) 2001-09-21
DE50013301D1 (en) 2006-09-21
US20010018908A1 (en) 2001-09-06
DE10006622A1 (en) 2001-08-16
EP1126157B1 (en) 2006-08-09

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