EP2825764B1 - Fuel delivery device, and method for actuating a fuel delivery device - Google Patents

Fuel delivery device, and method for actuating a fuel delivery device Download PDF

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Publication number
EP2825764B1
EP2825764B1 EP13701617.6A EP13701617A EP2825764B1 EP 2825764 B1 EP2825764 B1 EP 2825764B1 EP 13701617 A EP13701617 A EP 13701617A EP 2825764 B1 EP2825764 B1 EP 2825764B1
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Prior art keywords
temperature
fuel
pressure
pump
reservoir
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EP13701617.6A
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German (de)
French (fr)
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EP2825764A1 (en
Inventor
Helmar Gruhl
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0606—Fuel temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3082—Control of electrical fuel pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/248—Temperature sensors
    • 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

Definitions

  • the invention relates to a method for actuating a fuel delivery device according to the preamble of the independent claim.
  • At least one pump delivers fuel to a reservoir.
  • the pressure in the memory is detected, it being distinguished on the basis of at least one speed signal and / or a load signal between at least a first and a second operating state.
  • at least one first pressure control means is used to set the pressure in the first operating state
  • at least one second pressure control means is used in the second operating state.
  • the pump In operating states with low fuel inlet temperatures ( ⁇ 5 - 15 ° C), however, the pump is operated unthrottled and the pressure control is implemented with a high-pressure control valve. This means that the pump absorbs the maximum possible energy and promotes a maximum volume flow at high pressure. This excess quantity is deactivated by the pressure regulating valve (DRV). By controlling the DRV, the potential energy, namely the pressure of the loss volume flow, is converted into thermal energy. The heated fuel quantity is then introduced in modern low-pressure fuel systems directly into the flow of the fuel filter.
  • DRV pressure regulating valve
  • the fuel in the filter is heated, which is necessary for diesel fuel, since it has poor flow properties at low temperatures and can clog the filter by precipitation of a solid phase. This will cause the engine or vehicle to stop.
  • the fuel in the inlet of the high-pressure pump very quickly exceeds the highest possible temperature for this operating state (DRV control), and returns to the suction throttle mode (ZME).
  • DVR control the lowest possible temperature for this operating state
  • ZME suction throttle mode
  • the inlet temperature of the filter and the high-pressure pump drops rapidly again, since only cold fuel from the tank of the vehicle is promoted. If the lower temperature limit for the suction throttle mode is undershot, the system switches back to DRV mode. This means that in cold temperatures often between the two control modes is changed.
  • the method according to the invention for actuating a fuel delivery device with the characterizing features of the independent claim has the advantage that it is not necessary to switch back and forth between two regulation modes.
  • the delivery rate of the feed pump can be increased or reduced, so that always the desired temperature between the feed pump and high-pressure pump is reached. This can avoid that the filter between the feed pump and high-pressure pump clogged at too cold fuel temperatures. Too high temperatures are avoided, which may stress the components and lines too much.
  • Another advantage is given by the ability to regulate the pressure in the high pressure range by means of volume control, as a function of the operating situation of the internal combustion engine, the pressure in the high pressure range can be adjusted very accurately. Furthermore, the fuel in the hydraulic line is supplied with heating fuel via the return line, which prevents clogging of the filter in the hydraulic line.
  • a throttle device on the suction side of the high-pressure pump through which the flow rate of the high-pressure pump is controlled, since this element for the inventive device and the inventive method allows the fuel to flow unhindered to the high-pressure pump.
  • the throttle device allows the demand-based adjustment of the amount of fuel flowing to the high-pressure pump.
  • the FIG. 1 shows a fuel delivery device in a schematic representation.
  • the fuel delivery device has a feed pump 10, which draws fuel from a reservoir 12.
  • fuel is conveyed through a hydraulic line 32 to a suction side of at least one high-pressure pump 16, which is also part of the fuel delivery device.
  • the feed pump 10 has an electric drive, the variable with Power and thus variable speed or constant power and speed can be operated.
  • a high-pressure region 18 which comprises, for example, a high-pressure accumulator 18.
  • injectors 19 are supplied with fuel from the high-pressure region 18, wherein an injector 19 is assigned to each cylinder of the internal combustion engine.
  • the high-pressure pump 16 has at least one pump element, which in turn has a pump piston which is driven in a stroke movement and limits a pump working space.
  • the drive range of the high-pressure pump 16 is driven mechanically, for example via a transmission or a belt drive of the internal combustion engine, so that the speed of the high pressure pump 16 is proportional to the speed of the internal combustion engine.
  • a fuel filter 33 is arranged in the hydraulic line 32 in order to prevent dirt particles from entering the high-pressure pump 16 and the high-pressure region 18.
  • a throttle device 14 may be arranged in order to adapt the amount of fuel delivered by the feed pump 10 to the demand for the pressure in the high-pressure region 18.
  • a branch line 30 can branch off from the hydraulic connection 32.
  • a pressure relief valve 28 is arranged, which opens when exceeding a predetermined opening pressure and abgrest fuel from the hydraulic line 32 into the reservoir 12.
  • the branch line 30 is arranged upstream of the throttle device 14 in the flow direction.
  • the pressure in the high-pressure region 18 can be regulated in addition to regulation by the throttle device 14 via a device for volume control 24 become.
  • the device for flow control 24 may be configured as a pressure control valve 24. This pressure control valve 24 controls excess fuel from the high-pressure region 18 into a return line 26.
  • the return line 26 opens via a mixing point 25 in a portion of the hydraulic line 32 between the feed pump 10 and filter 33rd
  • a temperature sensor 20 is arranged in the hydraulic line 32.
  • the temperature sensor 20 is located in a preferred embodiment in a portion of the hydraulic line 32 between the filter 33 and the high pressure pump 16.
  • the temperature sensor 20 may also be disposed in a portion of the hydraulic line 32 between the mixing point 25 and the filter 33.
  • the temperature sensor 20 is connected to a control device 22 in connection.
  • the control device 22 is connected to the electric drive of the feed pump 10 and can vary the delivery rate of the feed pump 10 by controlling the electric drive of the feed pump 10 with different power.
  • the control device 22 can control the throttling device 14 such that the throttle device 14 completely opens and the entire amount of fuel conveyed by the feed pump 10 reaches the high-pressure pump 16, or that the cross section of the throttle device 14 is reduced, so that only a part of the Feed pump 10 conveyed amount of fuel to the high-pressure pump 16 passes, or that the throttle device 14 is closed and no fuel to the high-pressure pump 16 passes.
  • control device 22 can control the quantity-regulating device 24 in such a way that a desired pressure is established in the high-pressure region 18.
  • An inventive method for operating the fuel delivery device is the controlled heating of the fuel and is used when falling below a predetermined temperature T M in the reservoir 12.
  • T M a predetermined temperature
  • the temperature of the fuel in front of the filter 33 is specifically influenced in order to avoid clogging of the filter.
  • the temperature of the fuel in the reservoir 12 is heated so that it can be quickly switched to a normal control mode for the fuel delivery device.
  • FIG. 2 is a flowchart illustrating the inventive method of operating a fuel delivery device.
  • FIG. 12 is a flowchart illustrating the inventive method of operating a fuel delivery device.
  • the method checks whether the temperature in the storage container 12 is below the minimum temperature T M. This can be done by a temperature sensor in the reservoir 12, which is connected to the control device 22. Alternatively, by the temperature sensor 20 in the hydraulic line 32, the temperature of the fuel from the reservoir 12 can be measured approximately. In this case, it can be ensured by closing the device for quantity control 24 at the high-pressure region 18 that only fuel flows from the reservoir 12 through the hydraulic line 32.
  • the method goes to method step 200.
  • the throttle device 14 is completely opened.
  • the regulation of the pressure in the high-pressure region 18 takes place only via the device for volume control 24. Both the opening of the throttle device 14, as well as the control of the device for flow control 24 via the control device 22nd
  • Excess fuel from the high-pressure region 18 passes through the volume control device 24 and the return line 26 in the hydraulic line 32.
  • the fuel from the high-pressure region 18 has a higher temperature than the fuel from the reservoir 12, since the potential Energy in the high pressure area 18 is converted into thermal energy.
  • the heated fuel from the high-pressure region 18 mixes with the cool fuel from the reservoir 12 at the mixing point 25.
  • the temperature sensor 20 measures the temperature of the fuel in the hydraulic line 32, which results from the mixing of the warmer fuel from the return of the high-pressure region 18 and the reservoir 12. Exceeds the measured temperature at the temperature sensor 20, an upper temperature T o , the flow rate of the feed pump 10 is raised in step 330 by the temperature sensor 20 via the control device 22. In addition, the cross section of the throttle device 14 can be reduced. If the measured temperature falls below a lower temperature T u , the flow rate of the feed pump 10 is reduced in the method step 320 by the temperature sensor 20 via the control device 22.
  • method step 400 it is checked whether the minimum temperature T M in the storage container 12 has been reached. This can be carried out analogously to the methods proposed in method step 100. If the temperature in the storage container 12 is below the temperature T M , the process goes to step 300, otherwise the process in step E is terminated.
  • the check in method step 400 can take place after predefined time intervals, so that, for example, method step 400, in which the temperature in storage container 12 is checked, is carried out only after the expiry of a predetermined time interval. In this case, after the process step 330 or the method step 320, the method step 300 performed until the predetermined time interval has expired.

Description

Die Erfindung betrifft ein Verfahren zum Betätigen einer Kraftstofffördereinrichtung nach dem Oberbegriff des unabhängigen Anspruches.The invention relates to a method for actuating a fuel delivery device according to the preamble of the independent claim.

Stand der TechnikState of the art

Aus der Druckschrift DE 199 16 100 A1 sind bspw. ein Verfahren und eine Vorrichtung zur Steuerung einer Brennkraftmaschine, insbesondere einer Brennkraftmaschine mit einem Common-Rail-System, bekannt. Bei dem Verfahren fördert wenigstens eine Pumpe Kraftstoff in einen Speicher. Der Druck in dem Speicher wird erfasst, wobei ausgehend von wenigstens einem Drehzahlsignal und/oder einem Lastsignal zwischen mindestens einem ersten und einem zweiten Betriebszustand unterschieden wird. Dabei wird zur Einstellung des Drucks in dem ersten Betriebszustand wenigstens ein erstes Druckregelmittel und in dem zweiten Betriebszustand wenigstens ein zweites Druckregelmittel verwendet.From the publication DE 199 16 100 A1 are, for example, a method and an apparatus for controlling an internal combustion engine, in particular an internal combustion engine with a common rail system, known. In the method, at least one pump delivers fuel to a reservoir. The pressure in the memory is detected, it being distinguished on the basis of at least one speed signal and / or a load signal between at least a first and a second operating state. In this case, at least one first pressure control means is used to set the pressure in the first operating state, and at least one second pressure control means is used in the second operating state.

In der Druckschrift DE 10 2009 029 596 A1 wird ein weiteres Verfahren und eine Anordnung zur Steuerung einer Brennkraftmaschine beschrieben.In the publication DE 10 2009 029 596 A1 Another method and arrangement for controlling an internal combustion engine will be described.

In modernen Common-Rail-Systemen wird nur die benötigte Kraftstoffmenge auf Hochdruck komprimiert und ins Rail gefördert, was durch eine Saugdrosselung der Pumpe bzw. Hochdruckpumpe erreicht wird. Die Druckregelung im Rail wird in den meisten Betriebszuständen durch diese Mengenbilanz umgesetzt. Die geförderte Kraftstoffmenge entspricht dabei der benötigten Menge. Dadurch wird auch nur die tatsächlich benötigte Energie durch die Hochdruckpumpe aufgenommen.In modern common-rail systems, only the required amount of fuel is compressed to high pressure and conveyed into the rail, which is achieved by a suction throttling of the pump or high-pressure pump. The pressure control in the rail is implemented in most operating states by this mass balance. The subsidized fuel quantity corresponds to the required amount. As a result, only the energy actually required is absorbed by the high-pressure pump.

Bei Betriebszuständen mit niedrigen Kraftstoffzulauftemperaturen (< 5 - 15 °C) wird jedoch die Pumpe ungedrosselt betrieben und die Druckregelung mit einem Hochdruckregelventil umgesetzt. Dies bedeutet, dass die Pumpe die maximal mögliche Energie aufnimmt und einen maximalen Volumenstrom bei hohem Druck fördert. Dieser Mengenüberschuss wird durch das Druckregelventil (DRV) abgesteuert. Durch das Absteuern des DRV wird die potentielle Energie, nämlich der Druck des Verlustvolumenstroms, in thermische Energie gewandelt. Die aufgeheizte Kraftstoffmenge wird dann bei modernen Niederdruckkraftstoffsystemen direkt in den Vorlauf des Kraftstofffilters eingeleitet.In operating states with low fuel inlet temperatures (<5 - 15 ° C), however, the pump is operated unthrottled and the pressure control is implemented with a high-pressure control valve. This means that the pump absorbs the maximum possible energy and promotes a maximum volume flow at high pressure. This excess quantity is deactivated by the pressure regulating valve (DRV). By controlling the DRV, the potential energy, namely the pressure of the loss volume flow, is converted into thermal energy. The heated fuel quantity is then introduced in modern low-pressure fuel systems directly into the flow of the fuel filter.

Durch dieses Prinzip wird der Kraftstoff im Filter aufgeheizt, was bei Dieselkraftstoff notwendig ist, da dieser bei niedrigen Temperaturen schlechte Fließeigenschaften hat und durch Ausscheidung einer festen Phase den Filter verstopfen kann. Dies führt dazu, dass der Motor bzw. das Fahrzeug stehen bleibt. Da der Kraftstoff im Zulauf der Hochdruckpumpe dadurch sehr schnell die für diesen Betriebszustand (DRV-Regelung) höchstmögliche Temperatur überschreitet, wird in den Saugdrosselmodus (ZME) zurückgeschaltet. In diesem Fall sinkt die Zulauftemperatur des Filters und der Hochdruckpumpe schnell wieder ab, da nur kalter Kraftstoff aus dem Tank des Fahrzeugs gefördert wird. Wird dann die untere Temperaturgrenze für den Saugdrosselmodus unterschritten, wird wieder in den DRV-Modus zurückgeschaltet. Dies führt dazu, dass bei kalten Temperaturen häufig zwischen beiden Regelmodi gewechselt wird.By this principle, the fuel in the filter is heated, which is necessary for diesel fuel, since it has poor flow properties at low temperatures and can clog the filter by precipitation of a solid phase. This will cause the engine or vehicle to stop. As a result, the fuel in the inlet of the high-pressure pump very quickly exceeds the highest possible temperature for this operating state (DRV control), and returns to the suction throttle mode (ZME). In this case, the inlet temperature of the filter and the high-pressure pump drops rapidly again, since only cold fuel from the tank of the vehicle is promoted. If the lower temperature limit for the suction throttle mode is undershot, the system switches back to DRV mode. This means that in cold temperatures often between the two control modes is changed.

Offenbarung der ErfindungDisclosure of the invention

Das erfindungsgemäße Verfahren zum Betätigen einer Kraftstofffördereinrichtung mit den kennzeichnenden Merkmalen des unabhängigen Anspruches hat den Vorteil, dass nicht zwischen zwei Regelmodi hin und her geschaltet werden muss.The method according to the invention for actuating a fuel delivery device with the characterizing features of the independent claim has the advantage that it is not necessary to switch back and forth between two regulation modes.

Durch die Ansteuerung der Förderpumpe abhängig von der Temperatur in der hydraulischen Leitung im Zulauf der Hochdruckpumpe lässt sich die Fördermenge der Förderpumpe anheben oder reduzieren, so dass immer die gewünschte Temperatur zwischen Förderpumpe und Hochdruckpumpe erreicht wird. Dadurch kann vermieden werden, dass der Filter zwischen Förderpumpe und Hochdruckpumpe bei zu kalten Kraftstofftemperaturen verstopft. Es werden auch zu hohe Temperaturen vermieden, die eventuell die Bauteile und Leitungen zu stark beanspruchen.By controlling the feed pump depending on the temperature in the hydraulic line in the inlet of the high-pressure pump, the delivery rate of the feed pump can be increased or reduced, so that always the desired temperature between the feed pump and high-pressure pump is reached. This can avoid that the filter between the feed pump and high-pressure pump clogged at too cold fuel temperatures. Too high temperatures are avoided, which may stress the components and lines too much.

In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen des erfindungsgemäßen Verfahrens angegeben.In the dependent claims advantageous refinements and developments of the method according to the invention are given.

Vorteilhaft ist die Anordnung einer Abzweigleitung mit einer Einrichtung zur Mengenregulierung zwischen der hydraulischen Leitung und dem Vorratsbehälter, da durch die Abzweigleitung erwärmter Kraftstoff abgesteuert wird, welcher zu einer schnellen Erwärmung des Kraftstoffs im Vorratsbehälter führt.Advantageously, the arrangement of a branch line with a device for regulating the quantity between the hydraulic line and the reservoir, as heated fuel is diverted through the branch line, which leads to a rapid heating of the fuel in the reservoir.

Ein weiterer Vorteil wird durch die Möglichkeit gegeben den Druck im Hochdruckbereich durch eine Einrichtung zur Mengenregulierung zu regulieren, da dadurch abhängig von der Betriebssituation der Brennkraftmaschine der Druck im Hochdruckbereich sehr genau eingestellt werden kann. Des Weiteren wird der Kraftstoff in der hydraulischen Leitung über die Rücklaufleitung mit erwärmen Kraftstoff versorgt, welcher ein Verstopfen des Filters in der hydraulischen Leitung verhindert.Another advantage is given by the ability to regulate the pressure in the high pressure range by means of volume control, as a function of the operating situation of the internal combustion engine, the pressure in the high pressure range can be adjusted very accurately. Furthermore, the fuel in the hydraulic line is supplied with heating fuel via the return line, which prevents clogging of the filter in the hydraulic line.

Vorteilhaft ist eine Drosseleinrichtung auf der Saugseite der Hochdruckpumpe durch die die Fördermenge der Hochdruckpumpe regelbar ist, da dieses Element für die erfindungsgemäße Vorrichtung und das erfindungsgemäße Verfahren den Kraftstoff ungehindert zur Hochdruckpumpe strömen lässt. Für andere Regelmodi erlaubt die Drosseleinrichtung die bedarfsgerechte Anpassung der Kraftstoffmenge, die zur Hochdruckpumpe strömt.Advantageously, a throttle device on the suction side of the high-pressure pump through which the flow rate of the high-pressure pump is controlled, since this element for the inventive device and the inventive method allows the fuel to flow unhindered to the high-pressure pump. For other control modes, the throttle device allows the demand-based adjustment of the amount of fuel flowing to the high-pressure pump.

Ein Vorteil ergibt sich, wenn die Fördermenge der Förderpumpe angehoben wird, wenn durch den Temperatursensor eine Temperatur in der hydraulischen Leitung gemessen wird, die höher als eine obere Temperatur To ist. Durch den Anstieg der Fördermenge der Förderpumpe gelangt eine größere Menge an kühleren Kraftstoff aus dem Vorratsbehälter in die hydraulische Leitung, so dass die Temperatur wieder gesenkt wird bis eine Temperatur unterhalb der oberen Temperatur To erreicht istAn advantage arises when the delivery rate of the feed pump is raised when a temperature in the hydraulic line which is higher than an upper temperature T o is measured by the temperature sensor. Due to the increase in the delivery rate of the feed pump, a larger amount of cooler fuel from the reservoir enters the hydraulic line, so that the temperature is lowered again until a temperature below the upper temperature T o is reached

Ein Vorteil ergibt sich, wenn die Fördermenge der Förderpumpe reduziert wird, wenn durch den Temperatursensor eine Temperatur in der hydraulischen Leitung gemessen wird, die niedriger als eine untere Temperatur Tu ist. Durch die Reduzierung der Fördermenge der Förderpumpe gelangt eine geringere Menge an kühleren Kraftstoff aus dem Vorratsbehälter in die hydraulische Leitung, so dass die Temperatur wieder erhöht wird.An advantage arises when the delivery rate of the feed pump is reduced when a temperature in the hydraulic line which is lower than a lower temperature T u is measured by the temperature sensor. By reducing the delivery of the feed pump passes a smaller amount of cooler fuel from the reservoir into the hydraulic line, so that the temperature is increased again.

Durch die beiden vorher beschriebenen Maßnahmen kann sicher gestellt werden, dass sich die Temperatur des Kraftstoffs in der hydraulischen Leitung zwischen der unteren Temperatur Tu und der oberen Temperatur To befindet. Dadurch wird ein Versulzen des Filters durch zu niedrige Temperaturen und eine zu hohe Beanspruchung der Komponeten der Kraftstofffördereinrichtung bei zu hohen Kraftstofftemperaturen vermieden.By the two previously described measures can be ensured that the temperature of the fuel in the hydraulic line between the lower temperature T u and the upper temperature T o is. This avoids turbulence of the filter due to excessively low temperatures and excessive stress on the components of the fuel delivery device when the fuel temperatures are too high.

Ausführungsbeispieleembodiments

Bevorzugte Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert.Preferred embodiments of the invention are illustrated in the drawing and explained in more detail in the following description.

Es zeigen:

  • Figur 1 eine Kraftstofffördereinrichtung in einer schematischen Darstellung entsprechend einem ersten Ausführungsbeispiel der Erfindung und
  • Figur 2 ein Flussablaufdiagramm für ein Verfahren zum Betreiben einer Kraftstofffördereinrichtung.
Show it:
  • FIG. 1 a fuel delivery device in a schematic representation according to a first embodiment of the invention and
  • FIG. 2 a flow chart for a method for operating a fuel conveyor.

Die Figur 1 zeigt eine Kraftstofffördereinrichtung in einer schematischen Darstellung. Die Kraftstofffördereinrichtung weist eine Förderpumpe 10 auf, die Kraftstoff aus einem Vorratsbehälter 12 ansaugt. Durch die Förderpumpe 10 wird Kraftstoff durch eine hydraulische Leitung 32 zu einer Saugseite wenigstens einer Hochdruckpumpe 16 gefördert, die ebenfalls Bestandteil der Kraftstofffördereinrichtung ist. Die Förderpumpe 10 weist einen elektrischen Antrieb auf, der mit veränderlicher Leistung und damit variabler Drehzahl oder konstanter Leistung und Drehzahl betrieben werden kann.The FIG. 1 shows a fuel delivery device in a schematic representation. The fuel delivery device has a feed pump 10, which draws fuel from a reservoir 12. By the feed pump 10 fuel is conveyed through a hydraulic line 32 to a suction side of at least one high-pressure pump 16, which is also part of the fuel delivery device. The feed pump 10 has an electric drive, the variable with Power and thus variable speed or constant power and speed can be operated.

Durch die wenigstens eine Hochdruckpumpe 16 wird Kraftstoff, welcher von der Saugseite der Hochdruckpumpe 16 stammt, komprimiert und in einen Hochdruckbereich 18 gefördert, der beispielsweise einen Hochdruckspeicher 18 umfasst. Aus dem Hochdruckbereich 18 werden ein oder mehrere Injektoren 19 mit Kraftstoff versorgt, wobei jedem Zylinder der Brennkraftmaschine ein Injektor 19 zugeordnet ist.Due to the at least one high-pressure pump 16, fuel which originates from the suction side of the high-pressure pump 16 is compressed and conveyed into a high-pressure region 18, which comprises, for example, a high-pressure accumulator 18. One or more injectors 19 are supplied with fuel from the high-pressure region 18, wherein an injector 19 is assigned to each cylinder of the internal combustion engine.

Die Hochdruckpumpe 16 weist wenigstens ein Pumpenelement auf, das wiederum einen Pumpenkolben aufweist, der in einer Hubbewegung angetrieben wird und einen Pumpenarbeitsraum begrenzt. Der Antriebsbereich der Hochdruckpumpe 16 wird mechanisch, beispielsweise über ein Getriebe oder einen Riementrieb von der Brennkraftmaschine angetrieben, so dass die Drehzahl der Hochdruckpumpe 16 proportional zur Drehzahl der Brennkraftmaschine ist.The high-pressure pump 16 has at least one pump element, which in turn has a pump piston which is driven in a stroke movement and limits a pump working space. The drive range of the high-pressure pump 16 is driven mechanically, for example via a transmission or a belt drive of the internal combustion engine, so that the speed of the high pressure pump 16 is proportional to the speed of the internal combustion engine.

In der hydraulischen Leitung 32 ist ein Kraftstofffilter 33 angeordnet, um zu verhindern, dass Schmutzpartikel in die Hochdruckpumpe 16 und in den Hochdruckbereich 18 gelangen.A fuel filter 33 is arranged in the hydraulic line 32 in order to prevent dirt particles from entering the high-pressure pump 16 and the high-pressure region 18.

In der hydraulischen Verbindung 32 kann eine Drosseleinrichtung 14 angeordnet sein, um die von der Förderpumpe 10 geförderte Kraftstoffmenge an den Bedarf für den Druck im Hochdruckbereich 18 anzupassen.In the hydraulic connection 32, a throttle device 14 may be arranged in order to adapt the amount of fuel delivered by the feed pump 10 to the demand for the pressure in the high-pressure region 18.

Des Weiteren kann von der hydraulischen Verbindung 32 eine Abzweigleitung 30 abzweigen. In der Abzweigleitung 30 ist ein Überdruckventil 28 angeordnet, welches bei der Überschreitung eines vorgegebenen Öffnungsdruckes öffnet und Kraftstoff aus der hydraulischen Leitung 32 in den Vorratsbehälter 12 absteuert. Die Abzweigleitung 30 ist in Strömungsrichtung vor der Drosseleinrichtung 14 angeordnet.Furthermore, a branch line 30 can branch off from the hydraulic connection 32. In the branch line 30, a pressure relief valve 28 is arranged, which opens when exceeding a predetermined opening pressure and absteuert fuel from the hydraulic line 32 into the reservoir 12. The branch line 30 is arranged upstream of the throttle device 14 in the flow direction.

Der Druck im Hochdruckbereich 18 kann zusätzlich zur Regelung durch die Drosseleinrichtung 14 über eine Einrichtung zur Mengenregelung 24 geregelt werden. Die Einrichtung zur Mengenregelung 24 kann als Druckregelventil 24 ausgestaltet sein. Dieses Druckregelventil 24 steuert überschüssigen Kraftstoff aus dem Hochdruckbereich 18 in eine Rücklaufleitung 26 ab. Die Rücklaufleitung 26 mündet über einen Mischpunkt 25 in einen Abschnitt der hydraulischen Leitung 32 zwischen Förderpumpe 10 und Filter 33.The pressure in the high-pressure region 18 can be regulated in addition to regulation by the throttle device 14 via a device for volume control 24 become. The device for flow control 24 may be configured as a pressure control valve 24. This pressure control valve 24 controls excess fuel from the high-pressure region 18 into a return line 26. The return line 26 opens via a mixing point 25 in a portion of the hydraulic line 32 between the feed pump 10 and filter 33rd

In der hydraulischen Leitung 32 ist ein Temperatursensor 20 angeordnet. Der Temperatursensor 20 befindet sich in einer bevorzugten Ausführungsform in einem Abschnitt der hydraulischen Leitung 32 zwischen dem Filter 33 und der Hochdruckpumpe 16. Der Temperatursensor 20 kann auch in einem Abschnitt der hydraulischen Leitung 32 zwischen dem Mischpunkt 25 und dem Filter 33 angeordnet sein.In the hydraulic line 32, a temperature sensor 20 is arranged. The temperature sensor 20 is located in a preferred embodiment in a portion of the hydraulic line 32 between the filter 33 and the high pressure pump 16. The temperature sensor 20 may also be disposed in a portion of the hydraulic line 32 between the mixing point 25 and the filter 33.

Der Temperatursensor 20 steht mit einer Steuereinrichtung 22 in Verbindung. Die Steuereinrichtung 22 ist mit dem elektrischen Antrieb der Förderpumpe 10 verbunden und kann die Fördermenge der Förderpumpe 10 variieren, indem sie den elektrischen Antrieb der Förderpumpe 10 mit unterschiedlicher Leistung ansteuert.The temperature sensor 20 is connected to a control device 22 in connection. The control device 22 is connected to the electric drive of the feed pump 10 and can vary the delivery rate of the feed pump 10 by controlling the electric drive of the feed pump 10 with different power.

Es ist eine Verbindung zwischen der Steuereinrichtung 22 und der Drosseleinrichtung 14 vorgesehen. Die Steuereinrichtung 22 kann die Drosseleinrichtung 14 so ansteuern, dass die Drosseleinrichtung 14 vollständig öffnet und die gesamte von der Förderpumpe 10 geförderte Menge an Kraftstoff zur Hochdruckpumpe 16 gelangt, oder dass der Querschnitt der Drosseleinrichtung 14 reduziert ist, so dass nur ein Teil der von der Förderpumpe 10 geförderte Menge an Kraftstoff zur Hochdruckpumpe 16 gelangt, oder dass die Drosseleinrichtung 14 geschlossen ist und kein Kraftstoff zur Hochdruckpumpe 16 gelangt.There is provided a connection between the control device 22 and the throttle device 14. The control device 22 can control the throttling device 14 such that the throttle device 14 completely opens and the entire amount of fuel conveyed by the feed pump 10 reaches the high-pressure pump 16, or that the cross section of the throttle device 14 is reduced, so that only a part of the Feed pump 10 conveyed amount of fuel to the high-pressure pump 16 passes, or that the throttle device 14 is closed and no fuel to the high-pressure pump 16 passes.

Des Weiteren besteht eine Verbindung zwischen der Steuereinrichtung 22 und der Einrichtung zur Mengenregulierung 24. Die Steuereinrichtung 22 kann die Einrichtung zur Mengenregulierung 24 so ansteuern, dass sich im Hochdruckbereich 18 ein gewünschter Druck einstellt.Furthermore, there is a connection between the control device 22 and the quantity-regulating device 24. The control device 22 can control the quantity-regulating device 24 in such a way that a desired pressure is established in the high-pressure region 18.

Ein erfindungsgemäßes Verfahren zum Betreiben der Kraftstofffördereinrichtung dient dem kontrollierten Erwärmen des Kraftstoffes und wird beim Unterschreiten einer vorgegebenen Temperatur TM im Vorratsbehälter 12 eingesetzt. Durch das erfindungsgemäße Verfahren wird die Temperatur des Kraftstoffes vor dem Filter 33 gezielt beeinflusst, um ein Verstopfen des Filters zu vermeiden. Des Weiteren wird die Temperatur des Kraftstoffes im Vorratsbehälter 12 erwärmt, so dass schnell in einen normalen Regelmodus für die Kraftstofffördereinrichtung umgeschaltet werden kann.An inventive method for operating the fuel delivery device is the controlled heating of the fuel and is used when falling below a predetermined temperature T M in the reservoir 12. By means of the method according to the invention, the temperature of the fuel in front of the filter 33 is specifically influenced in order to avoid clogging of the filter. Furthermore, the temperature of the fuel in the reservoir 12 is heated so that it can be quickly switched to a normal control mode for the fuel delivery device.

Das Verfahren wird vorzugsweise nach einem Start der Brennkraftmaschine eingesetzt. Die Figur 2 zeigt ein Flussablaufdiagramm, welches das erfinderische Verfahren zum Betreiben einer Kraftstofffördereinrichtung darstellt.The method is preferably used after a start of the internal combustion engine. The FIG. 2 FIG. 12 is a flowchart illustrating the inventive method of operating a fuel delivery device. FIG.

Das Verfahren überprüft nach dem Start S im Verfahrensschritt 100, ob die Temperatur im Vorratsbehälter 12 die Minimaltemperatur TM unterschreitet. Dies kann durch einen Temperatursensor im Vorratsbehälter 12 erfolgen, welcher mit der Steuereinrichtung 22 verbunden ist. Alternativ kann durch den Temperatursensor 20 in der hydraulischen Leitung 32 die Temperatur des Kraftstoffes aus dem Vorratsbehälter 12 nährungsweise gemessen werden. Hierbei kann durch das Schließen der Einrichtung zur Mengenregelung 24 am Hochdruckbereich 18 sichergestellt werden, dass nur Kraftstoff aus dem Vorratsbehälter 12 durch die hydraulische Leitung 32 strömt.After the start S in method step 100, the method checks whether the temperature in the storage container 12 is below the minimum temperature T M. This can be done by a temperature sensor in the reservoir 12, which is connected to the control device 22. Alternatively, by the temperature sensor 20 in the hydraulic line 32, the temperature of the fuel from the reservoir 12 can be measured approximately. In this case, it can be ensured by closing the device for quantity control 24 at the high-pressure region 18 that only fuel flows from the reservoir 12 through the hydraulic line 32.

Ist die Temperatur im Vorratsbehälter 12 kleiner als die Minimaltemperatur TM wird zum Verfahrensschritt 200 gegangen. Im Verfahrensschritt 200 wird die Drosseleinrichtung 14 vollständig geöffnet. Die Regelung des Drucks im Hochdruckbereich 18 erfolgt nur noch über die Einrichtung zur Mengenregelung 24. Sowohl das Öffnen der Drosseleinrichtung 14, als auch die Steuerung der Einrichtung zur Mengenregelung 24 erfolgen über die Steuereinrichtung 22.If the temperature in the storage container 12 is smaller than the minimum temperature T M , the method goes to method step 200. In method step 200, the throttle device 14 is completely opened. The regulation of the pressure in the high-pressure region 18 takes place only via the device for volume control 24. Both the opening of the throttle device 14, as well as the control of the device for flow control 24 via the control device 22nd

Überschüssiger Kraftstoff aus dem Hochdruckbereich 18 gelangt über die Einrichtung zur Mengenregelung 24 und die Rücklaufleitung 26 in die hydraulische Leitung 32. Der Kraftstoff aus dem Hochdruckbereich 18 weist eine höhere Temperatur auf als der Kraftstoff aus dem Vorratsbehälter 12, da die potentielle Energie im Hochdruckbereich 18 in thermische Energie umgewandelt wird. Der erwärmte Kraftstoff aus dem Hochdruckbereich 18 vermischt sich am Mischpunkt 25 mit dem kühlen Kraftstoff aus dem Vorratsbehälter 12.Excess fuel from the high-pressure region 18 passes through the volume control device 24 and the return line 26 in the hydraulic line 32. The fuel from the high-pressure region 18 has a higher temperature than the fuel from the reservoir 12, since the potential Energy in the high pressure area 18 is converted into thermal energy. The heated fuel from the high-pressure region 18 mixes with the cool fuel from the reservoir 12 at the mixing point 25.

Im Verfahrensschritt 300 wird durch den Temperatursensor 20 die Temperatur des Kraftstoffes in der hydraulischen Leitung 32 gemessen, welche sich durch das Mischen des wärmeren Kraftstoffes aus dem Rücklauf des Hochdruckbereiches 18 und dem Vorratsbehälter 12 ergibt. Überschreitet die gemessenen Temperatur am Temperatursensor 20 eine obere Temperatur To, so wird im Verfahrensschritt 330 durch den Temperatursensor 20 über die Steuereinrichtung 22 die Fördermenge der Förderpumpe 10 angehoben. Zusätzlich kann auch der Querschnitt der Drosseleinrichtung 14 reduziert werden. Unterschreitet die gemessenen Temperatur eine untere Temperatur Tu, so wird im Verfahrensschritt 320 durch den Temperatursensor 20 über die Steuereinrichtung 22 die Fördermenge der Förderpumpe 10 reduziert.In method step 300, the temperature sensor 20 measures the temperature of the fuel in the hydraulic line 32, which results from the mixing of the warmer fuel from the return of the high-pressure region 18 and the reservoir 12. Exceeds the measured temperature at the temperature sensor 20, an upper temperature T o , the flow rate of the feed pump 10 is raised in step 330 by the temperature sensor 20 via the control device 22. In addition, the cross section of the throttle device 14 can be reduced. If the measured temperature falls below a lower temperature T u , the flow rate of the feed pump 10 is reduced in the method step 320 by the temperature sensor 20 via the control device 22.

Im Verfahrensschritt 400 wird überprüft, ob die Minimaltemperatur TM im Vorratsbehälter 12 erreicht wurde. Dies kann analog zu den im Verfahrensschritt 100 vorgeschlagenen Methoden durchgeführt werden. Falls die Temperatur im Vorratsbehälter 12 unter der Temperatur TM liegt, wird zum Verfahrensschritt 300 gegangen, ansonsten wird das Verfahren im Verfahrensschritt E beendet.In method step 400, it is checked whether the minimum temperature T M in the storage container 12 has been reached. This can be carried out analogously to the methods proposed in method step 100. If the temperature in the storage container 12 is below the temperature T M , the process goes to step 300, otherwise the process in step E is terminated.

Alternativ kann auch solange die Fördermenge der Förderpumpe 10 angehoben werden bis ein Überschreiten der gemessenen Temperatur am Temperatursensor 20 einer oberen Temperatur TO nicht mehr verhindert werden kann, weil die Fördermenge der Förderpumpe 10 ihr Maximum erreicht hat. Danach wird im Verfahrensschritt 400 überprüft, ob die Minimaltemperatur TM im Vorratsbehälter 12 erreicht wurde.Alternatively, as long as the delivery rate of the feed pump 10 are raised until exceeding the measured temperature at the temperature sensor 20 an upper temperature T O can not be prevented because the delivery of the feed pump 10 has reached its maximum. Thereafter, it is checked in method step 400 whether the minimum temperature T M in the storage container 12 has been reached.

Die Überprüfung im Verfahrensschritt 400 kann nach vorgegebenen Zeitintervallen erfolgen, so dass beispielsweise nur nach dem Ablauf eines vorgegebenen Zeitintervalls der Verfahrensschritt 400 durchgeführt wird, bei dem die Temperatur im Vorratsbehälter 12 überprüft wird. In diesem Fall wird nach dem Verfahrensschritt 330 oder dem Verfahrensschritt 320 der Verfahrensschritt 300 durchgeführt bis das vorgegebene Zeitintervall abgelaufen ist.The check in method step 400 can take place after predefined time intervals, so that, for example, method step 400, in which the temperature in storage container 12 is checked, is carried out only after the expiry of a predetermined time interval. In this case, after the process step 330 or the method step 320, the method step 300 performed until the predetermined time interval has expired.

Claims (6)

  1. Method for operating a fuel delivery device for a fuel injection device of an internal combustion engine with a delivery pump (10) which delivers fuel from a reservoir (12) via a hydraulic line (32) to a high-pressure pump (16), the high-pressure pump (16) delivering fuel into a high-pressure region (18), a temperature sensor (20) being arranged in the hydraulic line (32), which temperature sensor (20) is connected to a control device (22), characterized in that, if a minimum temperature TM is undershot in the reservoir (12), the delivery quantity of the delivery pump (10) is varied in a manner dependent on the temperature in the hydraulic line (32), which temperature was measured by the temperature sensor (20), in order to raise the temperature in the reservoir (12).
  2. Method according to Claim 1, characterized in that the pressure in the high-pressure region (18) is regulated via the device for quantity regulation (24) if the temperature of the fuel in the reservoir (12) undershoots the minimum temperature TM.
  3. Method according to Claim 1 or 2, characterized in that the throttle device (14) is opened completely if the temperature of the fuel in the reservoir (12) undershoots the minimum temperature TM.
  4. Method according to either of Claims 1 and 2, characterized in that the delivery quantity of the delivery pump (10) is raised if a temperature which is higher than an upper temperature To is measured in the hydraulic line (32) by way of the temperature sensor (20).
  5. Method according to Claim 4, characterized in that the cross section of the throttle device (14) is reduced if the delivery pump (10) has reached its maximum delivery quantity.
  6. Method according to one of Claims 1 to 3, characterized in that the delivery quantity of the delivery pump (10) is reduced if a temperature which is lower than a lower temperature TU is measured in the hydraulic line (32) by way of the temperature sensor (20).
EP13701617.6A 2012-03-13 2013-01-24 Fuel delivery device, and method for actuating a fuel delivery device Active EP2825764B1 (en)

Applications Claiming Priority (2)

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DE201210203867 DE102012203867A1 (en) 2012-03-13 2012-03-13 Fuel delivery device and method for actuating a fuel delivery device
PCT/EP2013/051357 WO2013135409A1 (en) 2012-03-13 2013-01-24 Fuel delivery device, and method for actuating a fuel delivery device

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EP2825764B1 true EP2825764B1 (en) 2016-01-20

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US10934933B2 (en) * 2018-08-31 2021-03-02 Paccar Inc Fuel gelling prevention using engine auto start functionality

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DE19818421B4 (en) * 1998-04-24 2017-04-06 Robert Bosch Gmbh Fuel supply system of an internal combustion engine
DE19916100A1 (en) 1999-04-09 2000-10-12 Bosch Gmbh Robert Method and device for controlling an internal combustion engine
DE102010031628A1 (en) * 2009-08-17 2011-02-24 Robert Bosch Gmbh Fuel delivery device for a fuel injection device of an internal combustion engine
DE102009029596B4 (en) * 2009-09-18 2018-06-14 Robert Bosch Gmbh Method for controlling an internal combustion engine
DE102009043072A1 (en) * 2009-09-25 2011-03-31 Volkswagen Ag Method for operating internal combustion engine, particularly of motor vehicle, involves conveying fuel by fuel pump of fuel tank into fuel line with predetermined pressure

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DE102012203867A1 (en) 2013-09-19
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