EP1825125A1 - Method for operating a fuel system of a combustion engine - Google Patents

Method for operating a fuel system of a combustion engine

Info

Publication number
EP1825125A1
EP1825125A1 EP05797117A EP05797117A EP1825125A1 EP 1825125 A1 EP1825125 A1 EP 1825125A1 EP 05797117 A EP05797117 A EP 05797117A EP 05797117 A EP05797117 A EP 05797117A EP 1825125 A1 EP1825125 A1 EP 1825125A1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
combustion engine
value
internal combustion
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
EP05797117A
Other languages
German (de)
French (fr)
Other versions
EP1825125B1 (en
Inventor
Guenter Veit
Stefan Keller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1825125A1 publication Critical patent/EP1825125A1/en
Application granted granted Critical
Publication of EP1825125B1 publication Critical patent/EP1825125B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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
    • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/141—Introducing closed-loop corrections characterised by the control or regulation method using a feed-forward control element
    • 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
    • F02D2200/0602—Fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/31—Control of the fuel pressure

Definitions

  • the invention firstly relates to a method for operating a fuel system of an internal combustion engine, in which a pressure control device is precontrolled with a pilot signal, which is determined taking into account a desired pressure in a region of the fuel system, in particular a fuel pressure accumulator.
  • the invention further relates to a computer program, an electrical storage medium for a control and / or regulating device of an internal combustion engine, a control and / or regulating device for an internal combustion engine, and an internal combustion engine, in particular for a motor vehicle.
  • EP 1 086 307 Bl A method of the aforementioned type is known from EP 1 086 307 Bl.
  • Both the high-pressure fuel pump and the pressure control valve are controlled by a controller with which a certain Pressure can be set or adjusted in the fuel pressure accumulator.
  • a feedforward control is provided.
  • the pressure control valve is thereby precontrolled, inter alia, depending on a desired pressure in the fuel pressure accumulator.
  • the present invention has the object, a method of the type mentioned so on to form that the pressure in the fuel pressure accumulator with even higher
  • This object is achieved in a method of the type mentioned in that in the determination of the pilot signal, a value for a passing through the pressure regulating device fuel quantity is taken into account.
  • a value for a passing through the pressure regulating device fuel quantity is taken into account.
  • the control signal which is required to maintain a certain pressure in a region of the fuel system depends on the amount of fuel which flows out of the region through the pressure control device.
  • the desired pressure can be set with much higher accuracy and better dynamics.
  • the required control actions are correspondingly smaller, which also benefits the dynamics of adjusting the pressure in the fuel pressure accumulator.
  • a pressure regulating device when using the method according to the invention, can be used which is manufactured with greater tolerances, since the greater the tolerances, the greater the dependence of the control signal required for a certain pressure in the region on the fuel quantity flowing through the pressure regulating device. with which the pressure control device is made. However, since this dependency is considered according to the invention, the corresponding tolerances of the pressure control device only play a diminished role.
  • a quantity of fuel delivered by a high-pressure fuel pump is taken into account in determining the value for the fuel quantity flowing through the pressure regulating device. This is based on the idea that when a certain pressure level is to be maintained in the fuel pressure accumulator, for example, the greater the amount of fuel delivered by the high-pressure fuel pump, the greater the amount of fuel flowing through the pressure control device.
  • Pressure control device is thereby simplified and at the same time its precision is improved.
  • Pressure control device flowing through amount of fuel considerably.
  • the method according to the invention is simple to implement when a factor is determined from the value for a fuel quantity flowing through the pressure regulating device, with which a raw pilot signal which takes into account a desired pressure in the region of the fuel system, in particular in the fuel pressure accumulator is determined, is applied.
  • Figure 1 is a schematic representation of an internal combustion engine with a fuel system with a pressure control device
  • FIG. 2 shows a flow diagram of a method for determining a pilot control signal for precontrol of the pressure control device of FIG. 1.
  • An internal combustion engine carries the reference numeral 10 in its entirety in FIG. 1. It comprises a fuel system, which is denoted by 12.
  • Part of the fuel system 12 is a fuel tank 14, from which an electrically driven prefeed pump 16 conveys the fuel to a mechanically driven high-pressure fuel pump 18. Their delivery rate can be adjusted by a quantity control valve or metering unit 20.
  • the high-pressure fuel pump 18 delivers the fuel into a fuel pressure accumulator 22, to which a plurality of injectors 24 are connected.
  • the fuel pressure accumulator 22 is also referred to as "rail".
  • the injectors 24 inject the fuel directly into them directly
  • Combustion chambers 26 a During operation of the internal combustion engine 10, a crankshaft 28 is set in rotation, the speed of which is detected by a sensor 29 and which drives the high-pressure fuel pump 18 via a mechanical connection 30.
  • an adjustable or controllable pressure control device 32 This may, for example, be a pressure regulating valve with a spring-loaded valve element.
  • the biasing force of the force acting on the valve element spring can be varied by means of an electromagnetic actuator.
  • the corresponding drive signal supplies a control and regulating device 34, which receives inter alia input signals from a pressure sensor 36, which detects the pressure in the fuel pressure accumulator 22.
  • the pressure control device 32, the fuel pressure accumulator 22, the control and regulating device 34 and the pressure sensor 36 thus form a closed controlled system.
  • a desired pressure in the fuel pressure accumulator 22 is defined depending on the state and operating variables of the internal combustion engine 10.
  • the state and operating variables which can influence the desired pressure in the fuel pressure accumulator 22 include, for example, the operating mode of the internal combustion engine 10, the load or the torque, which depends on the Internal combustion engine 10 is to be made, the speed detected by the sensor 29, with which the crankshaft 28 rotates, a temperature of the internal combustion engine 10, et cetera.
  • the pressure control device 32 is piloted. This means that, taking into account the desired pressure of the control and regulating device 34 with the interposition of a final stage, a pilot signal in the form of a pilot control current I DRV is generated. Due to the closed loop described above then only correspondingly small deviations must be compensated. The provision of the pilot current I DRV will now be explained in detail with reference to FIG. 2:
  • the speed nmot of the crankshaft 28 provided by the rotational speed sensor 29 is fed into a characteristic curve 38 which determines from the rotational speed nmot a delivery rate q ro p of the high-pressure fuel pump 18.
  • the characteristic curve 38 is based on the assumption that the metering unit 20 is set so that it does not limit the delivery rate of the high-pressure fuel pump 18.
  • QiNj is the amount of fuel that is injected from the injectors 24 into the combustion chambers 26.
  • q C0 N is the Abgres fuel quantity, which is used by the injectors 24 for the actuation thereof, and which is returned via a designated in Figure 1 at 42 return line to the fuel tank 14.
  • the amount of fuel qi NJ is also controlled by the control and regulating device 34 depending on state and Operating variables and determined depending on the desired torque. Depending on this, the return flow fuel quantity q C0 N results, for example, by means of a characteristic curve.
  • the sum value formed in 40 corresponds to that
  • This value is fed together with the value provided by the pressure sensor 36 for the actual pressure pr_ist, which prevails in the fuel pressure accumulator 22, in a map 46 which generates a correction factor KF.
  • This is multiplied in 48 by a raw pilot current I * DRV , which was generated by means of a characteristic curve 50, into which a desired pressure pr soll, which should prevail in the fuel pressure accumulator 22, was fed.
  • the result of the multiplication in block 48 is the pilot control current I DRV ⁇ with which the pressure control device 32 is precontrolled .
  • the correction factor KF takes into account that the current required to be applied to the
  • Pressure control device 32 to set a specific opening pressure, from the flowing through the pressure control device 32 fuel quantity q D Rv and the current actual pressure pr_ist, in the fuel pressure accumulator 22nd prevails, depends.
  • the method described is stored as a computer program in a memory of the control and regulating device 34.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

In a fuel system for an internal combustion engine, the fuel is pumped by a high-pressure fuel pump into a fuel pressure accumulator, from which it is supplied into at least one combustion chamber via at least one injector. A value is provided for the actual pressure in the fuel pressure accumulator. A pressure regulating device using which the fuel may be extracted from the fuel pressure accumulator is precontrolled using a precontrol signal, which is ascertained taking into account a setpoint pressure in the fuel pressure accumulator. A value for a fuel quantity flowing through the pressure regulating device is taken into account when ascertaining the precontrol signal.

Description

Verfahren zum Betreiben eines KraftstoffSystems einer BrennkraftmaschineMethod for operating a fuel system of an internal combustion engine
Stand der TechnikState of the art
Die Erfindung betrifft zunächst ein Verfahren zum Betreiben eines KraftstoffSystems einer Brennkraftmaschine, bei dem eine Druckregeleinrichtung mit einem Vorsteuersignal vorgesteuert wird, welches unter Berücksichtigung eines Soll-Drucks in einem Bereich des KraftstoffSystems, insbesondere einem Kraftstoffdruckspeicher, ermittelt wird.The invention firstly relates to a method for operating a fuel system of an internal combustion engine, in which a pressure control device is precontrolled with a pilot signal, which is determined taking into account a desired pressure in a region of the fuel system, in particular a fuel pressure accumulator.
Die Erfindung betrifft ferner ein Computerprogramm, ein elektrisches Speichermedium für eine Steuer- und/oder Regeleinrichtung einer Brennkraftmaschine, eine Steuer- und/oder Regeleinrichtung für eine Brennkraftmaschine, sowie eine Brennkraftmaschine, insbesondere für ein Kraftfahrzeug.The invention further relates to a computer program, an electrical storage medium for a control and / or regulating device of an internal combustion engine, a control and / or regulating device for an internal combustion engine, and an internal combustion engine, in particular for a motor vehicle.
Ein Verfahren der eingangs genannten Art ist aus der EP 1 086 307 Bl bekannt. Diese offenbart ein KraftstoffSystem, bei dem zum einen die Fördermenge einer Hochdruck- Kraftstoffpumpe und zum anderen der Öffnungsdruck eines Druckregelventils beeinflusst werden kann, welches an einen Kraftstoffdruckspeicher ("Rail") angeschlossen ist. Sowohl die Hochdruck-Kraftstoffpumpe als auch das Druckregelventil werden von einem Regler angesteuert, mit dem ein bestimmter Druck im Kraftstoffdruckspeicher eingestellt beziehungsweise eingeregelt werden kann. Zur Erhöhung der Dynamik und Präzision der Druckregelung ist dabei eine Vorsteuerung vorgesehen. Das Druckregelventil wird dabei unter anderem abhängig von einem Soll-Druck im Kraftstoffdruckspeicher vorgesteuert.A method of the aforementioned type is known from EP 1 086 307 Bl. This discloses a fuel system in which on the one hand the flow rate of a high-pressure fuel pump and on the other hand, the opening pressure of a pressure control valve can be influenced, which is connected to a fuel pressure accumulator ("rail"). Both the high-pressure fuel pump and the pressure control valve are controlled by a controller with which a certain Pressure can be set or adjusted in the fuel pressure accumulator. To increase the dynamics and precision of the pressure control while a feedforward control is provided. The pressure control valve is thereby precontrolled, inter alia, depending on a desired pressure in the fuel pressure accumulator.
Die vorliegende Erfindung hat die Aufgabe, ein Verfahren der eingangs genannten Art so weiter zu bilden, dass der Druck im Kraftstoffdruckspeicher mit noch höhererThe present invention has the object, a method of the type mentioned so on to form that the pressure in the fuel pressure accumulator with even higher
Genauigkeit eingestellt und /oder die Druckregeleinrichtung preiswerter hergestellt werden kann.Set accuracy and / or the pressure control device can be manufactured cheaper.
Diese Aufgabe wird bei einem Verfahren der eingangs genannten Art dadurch gelöst, dass bei der Ermittlung des Vorsteuersignals ein Wert für eine durch die Druckregeleinrichtung hindurchströmende Kraftstoffmenge berücksichtigt wird. Bei einem Computerprogramm, einem elektrischen Speichermedium, einer Steuer- und/oder Regeleinrichtung, und einer Brennkraftmaschine der eingangs genannten Art wird die gestellte Aufgabe entsprechend gelöst.This object is achieved in a method of the type mentioned in that in the determination of the pilot signal, a value for a passing through the pressure regulating device fuel quantity is taken into account. In a computer program, an electrical storage medium, a control and / or regulating device, and an internal combustion engine of the type mentioned, the object is achieved accordingly.
Vorteile der ErfindungAdvantages of the invention
Erfindungsgemäß wurde erkannt, dass das Steuersignal, welches erforderlich ist, um einen bestimmten Druck in einem Bereich des KraftstoffSystems, beispielweise einem Kraftstoffdruckspeicher zu halten, von der Kraftstoffmenge, welche aus dem Bereich durch die Druckregeleinrichtung hindurchströmt, abhängt. Indem diese Kraftstoffmenge beziehungsweise ein dieser wenigstens in etwa entsprechender Wert bei der Bestimmung des Vorsteuersignals berücksichtigt wird, mit dem die Druckregeleinrichtung angesteuert wird, kann der gewünschte Druck mit deutlich höherer Genauigkeit und besserer Dynamik eingestellt werden. Die erforderlichen Reglereingriffe sind entsprechend kleiner, was ebenfalls der Dynamik der Einstellung des Drucks im Kraftstoffdruckspeicher zugute kommt.According to the invention, it has been recognized that the control signal which is required to maintain a certain pressure in a region of the fuel system, for example a fuel pressure accumulator, depends on the amount of fuel which flows out of the region through the pressure control device. By this fuel quantity or one of these at least approximately corresponding value in the determination of the pilot signal is taken into account, with which the pressure control device is controlled, the desired pressure can be set with much higher accuracy and better dynamics. The required control actions are correspondingly smaller, which also benefits the dynamics of adjusting the pressure in the fuel pressure accumulator.
Bei Anwendung des erfindungsgemäßen Verfahrens kann darüber hinaus eine Druckregeleinrichtung verwendet werden, die mit größeren Toleranzen hergestellt ist, da die Abhängigkeit des für einen bestimmten Druck in dem Bereich erforderlichen Steuersignals von der durch die Druckregeleinrichtung hindurchströmenden Kraftstoffmenge umso größer ist, je größer die Toleranzen sind, mit denen die Druckregeleinrichtung hergestellt ist. Da erfindungsgemäß diese Abhängigkeit jedoch berücksichtigt wird, spielen die entsprechenden Toleranzen der Druckregeleinrichtung nur noch eine verminderte Rolle.In addition, when using the method according to the invention, a pressure regulating device can be used which is manufactured with greater tolerances, since the greater the tolerances, the greater the dependence of the control signal required for a certain pressure in the region on the fuel quantity flowing through the pressure regulating device. with which the pressure control device is made. However, since this dependency is considered according to the invention, the corresponding tolerances of the pressure control device only play a diminished role.
Bei einer vorteilhaften Weiterbildung des erfindungsgemäßen Verfahrens wird bei der Ermittlung des Werts für die durch die Druckregeleinrichtung hindurchströmende Kraftstoffmenge eine von einer Hochdruck-Kraftstoffpumpe geförderte Kraftstoffmenge berücksichtigt. Dem liegt der Gedanke zugrunde, dass dann, wenn ein bestimmtes Druckniveau beispielsweise im Kraftstoffdruckspeicher gehalten werden soll, die durch die Druckregeleinrichtung hindurchströmende Kraftstoffmenge umso größer ist, je größer die von der Hochdruck-Kraftstoffpumpe geförderte Kraftstoffmenge ist. Die Ermittlung des Vorsteuersignals für dieIn an advantageous development of the method according to the invention, a quantity of fuel delivered by a high-pressure fuel pump is taken into account in determining the value for the fuel quantity flowing through the pressure regulating device. This is based on the idea that when a certain pressure level is to be maintained in the fuel pressure accumulator, for example, the greater the amount of fuel delivered by the high-pressure fuel pump, the greater the amount of fuel flowing through the pressure control device. The determination of the pilot signal for the
Druckregeleinrichtung wird hierdurch vereinfacht und gleichzeitig wird dessen Präzision verbessert.Pressure control device is thereby simplified and at the same time its precision is improved.
Wird die Hochdruck-Kraftstoffpumpe mechanisch von der Brennkraftmaschine angetrieben, hängt die von ihr geförderte Kraftstoffmenge direkt von der Drehzahl der Brennkraftmaschine ab. Die Berücksichtigung dieser Drehzahl vereinfacht die Ermittlung der durch dieIf the high-pressure fuel pump is mechanically driven by the internal combustion engine, that depends on it Promoted fuel quantity directly from the speed of the internal combustion engine. The consideration of this speed simplifies the determination of the by the
Druckregeleinrichtung hindurchströmenden Kraftstoffmenge erheblich.Pressure control device flowing through amount of fuel considerably.
Bei der Ermittlung des Werts für die durch die Druckregeleinrichtung hindurchströmende Kraftstoffmenge kann auch eine über einen Injektor in einen Brennraum gelangende Kraftstoffmenge berücksichtigt werden. Auch dies dient zur Erhöhung der Präzision bei der Ermittlung der durch die Druckregeleinrichtung hindurchströmenden Kraftstoffmenge und somit letztlich zur präziseren Ermittlung des Vorsteuersignals.When determining the value for the fuel quantity flowing through the pressure regulating device, it is also possible to take account of an amount of fuel passing through an injector into a combustion chamber. This also serves to increase the precision in the determination of the amount of fuel flowing through the pressure regulating device and thus ultimately for a more precise determination of the pilot control signal.
In die gleiche Richtung zielt auch jene Weiterbildung des erfindungsgemäßen Verfahrens, bei der bei der Ermittlung des Werts für die durch die Druckregeleinrichtung hindurchströmende Kraftstoffmenge eine von einem Injektor abgesteuerte Kraftstoffmenge berücksichtigt wird. Eine solche Kraftstoffmenge wird für die Betätigung des Injektors benötigt.In the same direction also aims that further development of the method according to the invention, in which, when determining the value for the fuel quantity flowing through the pressure regulating device, an amount of fuel diverted by an injector is taken into account. Such an amount of fuel is needed for the actuation of the injector.
Programmtechnisch einfach zu realisieren ist das erfindungsgemäße Verfahren dann, wenn aus dem Wert für eine durch die Druckregeleinrichtung hindurchströmende Kraftstoffmenge ein Faktor ermittelt wird, mit dem ein Roh- Vorsteuersignal, welches unter Berücksichtigung eines Soll- Drucks in dem Bereich des KraftstoffSystems, insbesondere in dem Kraftstoffdruckspeicher ermittelt wird, beaufschlagt wird.The method according to the invention is simple to implement when a factor is determined from the value for a fuel quantity flowing through the pressure regulating device, with which a raw pilot signal which takes into account a desired pressure in the region of the fuel system, in particular in the fuel pressure accumulator is determined, is applied.
Dazuhin kann bei der Ermittlung des Faktors auch ein Wert für den aktuellen Druck in dem Bereich des KraftstoffSystems, insbesondere in dem Kraftstoffdruckspeicher berücksichtigt werden, denn auch dieser hat einen Einfluss auf das Vorsteuersignal, mit dem die Druckregeleinrichtung zur Einstellung eines bestimmten Drucks im Kaftstoffdruckspeicher angesteuert werden muss.In addition, when determining the factor, a value for the current pressure in the area of the fuel system, in particular in the fuel system, can also be obtained Fuel pressure accumulator are taken into account, because this also has an influence on the pilot signal, with which the pressure control device must be controlled to set a certain pressure in Kaftstoffdruckspeicher.
Zeichnungendrawings
Nachfolgend wird ein besonders bevorzugtes Ausführungsbeispiel der vorliegenden Erfindung unterHereinafter, a particularly preferred embodiment of the present invention below
Bezugnahme auf die beiliegende Zeichnung näher erläutert. In der Zeichnung zeigen:With reference to the accompanying drawings explained in more detail. In the drawing show:
Figur 1 eine schematische Darstellung einer Brennkraftmaschine mit einem KraftstoffSystem mit einer Druckregeleinrichtung; undFigure 1 is a schematic representation of an internal combustion engine with a fuel system with a pressure control device; and
Figur 2 ein Flussdiagramm eines Verfahrens zur Ermittlung eines Vorsteuersignals zur Vorsteuerung der Druckregeleinrichtung von Figur 1.FIG. 2 shows a flow diagram of a method for determining a pilot control signal for precontrol of the pressure control device of FIG. 1.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Eine Brennkraftmaschine trägt in Figur 1 insgesamt das Bezugszeichen 10. Sie umfasst ein KraftstoffSystem, welches mit 12 bezeichnet ist.An internal combustion engine carries the reference numeral 10 in its entirety in FIG. 1. It comprises a fuel system, which is denoted by 12.
Teil des KraftstoffSystems 12 ist ein Kraftstoffbehälter 14, aus dem eine elektrisch angetriebene Vorförderpumpe 16 den Kraftstoff zu einer mechanisch angetriebenen Hochdruck- Kraftstoffpumpe 18 fördert. Deren Förderleistung kann durch ein Mengensteuerventil oder eine Zumesseinheit 20 eingestellt werden. Die Hochdruck-Kraftstoffpumpe 18 fördert den Kraftstoff in einen Kraftstoffdruckspeicher 22, an den mehrere Injektoren 24 angeschlossen sind. Der Kraftstoffdruckspeicher 22 wird auch als "Rail" bezeichnet. Die Injektoren 24 spritzen den Kraftstoff direkt in ihnen unmittelbar zugeordnetePart of the fuel system 12 is a fuel tank 14, from which an electrically driven prefeed pump 16 conveys the fuel to a mechanically driven high-pressure fuel pump 18. Their delivery rate can be adjusted by a quantity control valve or metering unit 20. The high-pressure fuel pump 18 delivers the fuel into a fuel pressure accumulator 22, to which a plurality of injectors 24 are connected. The fuel pressure accumulator 22 is also referred to as "rail". The injectors 24 inject the fuel directly into them directly
Brennräume 26 ein. Im Betrieb der Brennkraftmaschine 10 wird eine Kurbelwelle 28 in Drehung versetzt, deren Drehzahl von einem Sensor 29 erfasst wird und welche über eine mechanische Verbindung 30 die Hochdruck- Kraftstoffpumpe 18 antreibt.Combustion chambers 26 a. During operation of the internal combustion engine 10, a crankshaft 28 is set in rotation, the speed of which is detected by a sensor 29 and which drives the high-pressure fuel pump 18 via a mechanical connection 30.
Zur Einstellung eines bestimmten Drucks im Kraftstoffdruckspeicher 22 ist dieser mit einer einstellbaren beziehungsweise ansteuerbaren Druckregeleinrichtung 32 verbunden. Bei dieser kann es sich beispielsweise um ein Druckregelventil mit einem federbelasteten Ventilelement handeln. Um den Öffnungsdruck eines solches Druckregelventils einstellen zu können, kann mittels einer elektromagnetischen Betätigungseinrichtung die Vorspannkraft der auf das Ventilelement wirkenden Feder variiert werden. Das entsprechende Ansteuersignal liefert eine Steuer- und Regeleinrichtung 34, die unter anderem Eingangssignale von einem Drucksensor 36 erhält, welcher den Druck im Kraftstoffdruckspeicher 22 erfasst. Die Druckregeleinrichtung 32, der Kraftstoffdruckspeicher 22, die Steuer- und Regeleinrichtung 34 und der Drucksensor 36 bilden also eine geschlossene Regelstrecke.To set a certain pressure in the fuel pressure accumulator 22, this is connected to an adjustable or controllable pressure control device 32. This may, for example, be a pressure regulating valve with a spring-loaded valve element. In order to adjust the opening pressure of such a pressure control valve, the biasing force of the force acting on the valve element spring can be varied by means of an electromagnetic actuator. The corresponding drive signal supplies a control and regulating device 34, which receives inter alia input signals from a pressure sensor 36, which detects the pressure in the fuel pressure accumulator 22. The pressure control device 32, the fuel pressure accumulator 22, the control and regulating device 34 and the pressure sensor 36 thus form a closed controlled system.
In der Steuer- und Regeleinrichtung 34 wird abhängig von Zustands- und Betriebsgrößen der Brennkraftmaschine 10 ein Soll-Druck im Kraftstoffdruckspeicher 22 definiert. Zu den Zustands- und Betriebsgrößen, welche den Soll-Druck im Kraftstoffdruckspeicher 22 beeinflussen können, gehört beispielsweise die Betriebsart der Brennkraftmaschine 10, die Last- beziehungsweise das Drehmoment, welches von der Brennkraftmaschine 10 geleistet werden soll, die vom Sensor 29 erfasste Drehzahl, mit welcher sich die Kurbelwelle 28 dreht, eine Temperatur der Brennkraftmaschine 10, et cetera.In the control and regulating device 34, a desired pressure in the fuel pressure accumulator 22 is defined depending on the state and operating variables of the internal combustion engine 10. The state and operating variables which can influence the desired pressure in the fuel pressure accumulator 22 include, for example, the operating mode of the internal combustion engine 10, the load or the torque, which depends on the Internal combustion engine 10 is to be made, the speed detected by the sensor 29, with which the crankshaft 28 rotates, a temperature of the internal combustion engine 10, et cetera.
Um eine möglichst gute Dynamik bei der Einstellung des Drucks im Kraftstoffdruckspeicher 22 realisieren zu können, wird die Druckregeleinrichtung 32 vorgesteuert. Dies bedeutet, dass unter Berücksichtigung des Soll-Drucks von der Steuer- und Regeleinrichtung 34 unter Zwischenschaltung einer Endstufe ein Vorsteuersignal in Form eines Vorsteuerstroms IDRV erzeugt wird. Durch den oben beschriebenen geschlossenen Regelkreis müssen dann nur noch entsprechend geringe Regelabweichungen ausgeregelt werden. Die Bereitstellung des Vorsteuerstroms IDRV wird nun unter Bezugnahme auf Figur 2 im Detail erläutert:In order to achieve the best possible dynamics in the adjustment of the pressure in the fuel pressure accumulator 22, the pressure control device 32 is piloted. This means that, taking into account the desired pressure of the control and regulating device 34 with the interposition of a final stage, a pilot signal in the form of a pilot control current I DRV is generated. Due to the closed loop described above then only correspondingly small deviations must be compensated. The provision of the pilot current I DRV will now be explained in detail with reference to FIG. 2:
Die vom Drehzahlsensor 29 bereitgestellte Drehzahl nmot der Kurbelwelle 28 wird in eine Kennlinie 38 eingespeist, die aus der Drehzahl nmot eine Fördermenge qrop der Hochdruck- Kraftstoffpumpe 18 ermittelt. Die Kennlinie 38 basiert dabei auf der Annahme, dass die Zumesseinheit 20 so eingestellt ist, dass sie die Förderleistung der Hochdruck- Kraftstoffpumpe 18 nicht beschränkt. In einem Additionsblock 40 wird ferner die Summe aus einerThe speed nmot of the crankshaft 28 provided by the rotational speed sensor 29 is fed into a characteristic curve 38 which determines from the rotational speed nmot a delivery rate q ro p of the high-pressure fuel pump 18. The characteristic curve 38 is based on the assumption that the metering unit 20 is set so that it does not limit the delivery rate of the high-pressure fuel pump 18. In addition block 40, the sum of a
Kraftstoffmenge qiNJ und einer Kraftstoffmenge qC0N gebildet. Bei qiNj handelt es sich um jene Kraftstoffmenge, welche von den Injektoren 24 in die Brennräume 26 eingespritzt wird.Fuel quantity qi NJ and a fuel quantity q C0 N formed. QiNj is the amount of fuel that is injected from the injectors 24 into the combustion chambers 26.
Bei qC0N handelt es sich um die Absteuer-Kraftstoffmenge, die von den Injektoren 24 für deren Betätigung verwendet wird, und die über eine in Figur 1 mit 42 bezeichnete Rückströmleitung zum Kraftstoffbehälter 14 zurückgeführt wird. Die Kraftstoffmenge qiNJ wird von der Steuer- und Regeleinrichtung 34 ebenfalls abhängig von Zustands- und Betriebsgrößen und abhängig vom gewünschten Drehmoment bestimmt. Abhängig hiervon ergibt sich beispielsweise mittels einer Kennlinie die Rückström-Kraftstoffmenge qC0N-At q C0 N is the Absteuer fuel quantity, which is used by the injectors 24 for the actuation thereof, and which is returned via a designated in Figure 1 at 42 return line to the fuel tank 14. The amount of fuel qi NJ is also controlled by the control and regulating device 34 depending on state and Operating variables and determined depending on the desired torque. Depending on this, the return flow fuel quantity q C0 N results, for example, by means of a characteristic curve.
Der in 40 gebildete Summenwert entspricht jenerThe sum value formed in 40 corresponds to that
Kraftstoffmenge, welche von den Injektoren 24 insgesamt aus dem Kraftstoffdruckspeicher 22 abgerufen wird. Dieser Summenwert wird in 44 von der Kraftstoffmenge qrop abgezogen, die von der Hochdruck-Kraftstoffpumpe 18 in den Kraftstoffdruckspeicher 22 gefördert wird. In den Blöcken 40 und 44 wird also eine erste Mengenbilanz für den Kraftstoffdruckspeicher erstellt. Die im Block 44 erhaltene Differenz entspricht einer Kraftstoffmenge qDRV, die aus dem Kraftstoffdruckspeicher 22 durch die Druckregeleinrichtung 32 hindurch ab- und über eine Leitung 45 zum Kraftstoffbehälter 14 zurückströmt.Amount of fuel which is retrieved from the injectors 24 in total from the fuel pressure accumulator 22. This sum value is subtracted in 44 from the fuel quantity q ro p, which is conveyed by the high-pressure fuel pump 18 in the fuel pressure accumulator 22. In blocks 40 and 44, therefore, a first mass balance for the fuel pressure accumulator is created. The difference obtained in block 44 corresponds to a fuel quantity q DRV which flows from the fuel pressure accumulator 22 through the pressure regulating device 32 and flows back via a line 45 to the fuel tank 14.
Dieser Wert wird zusammen mit dem vom Drucksensor 36 bereitgestellten Wert für den Ist-Druck pr_ist, welcher im Kraftstoffdruckspeicher 22 herrscht, in ein Kennfeld 46 eingespeist, welches einen Korrekturfaktor KF erzeugt. Dieser wird in 48 mit einem Roh-Vorsteuerstrom I*DRV multipliziert, der mittels einer Kennlinie 50 erzeugt wurde, in die ein Soll-Druck pr soll, der im Kraftstoffdruckspeicher 22 herrschen soll, eingespeist wurde. Das Ergebnis der Multiplikation im Block 48 ist der Vorsteuerstrom IDRVΛ mit dem die Druckregeleinrichtung 32 vorgesteuert wird.This value is fed together with the value provided by the pressure sensor 36 for the actual pressure pr_ist, which prevails in the fuel pressure accumulator 22, in a map 46 which generates a correction factor KF. This is multiplied in 48 by a raw pilot current I * DRV , which was generated by means of a characteristic curve 50, into which a desired pressure pr soll, which should prevail in the fuel pressure accumulator 22, was fed. The result of the multiplication in block 48 is the pilot control current I DRVΛ with which the pressure control device 32 is precontrolled .
Durch den Korrekturfaktor KF wird berücksichtigt, dass der Strom, der erforderlich ist, um an derThe correction factor KF takes into account that the current required to be applied to the
Druckregeleinrichtung 32 einen bestimmten Öffnungsdruck einzustellen, von der durch die Druckregeleinrichtung 32 hindurchströmenden Kraftstoffmenge qDRv und vom aktuellen Ist-Druck pr_ist, der im Kraftstoffdruckspeicher 22 herrscht, abhängt. Das beschriebene Verfahren ist als Computerprogramm in einem Speicher der Steuer- und Regeleinrichtung 34 abgelegt. Pressure control device 32 to set a specific opening pressure, from the flowing through the pressure control device 32 fuel quantity q D Rv and the current actual pressure pr_ist, in the fuel pressure accumulator 22nd prevails, depends. The method described is stored as a computer program in a memory of the control and regulating device 34.

Claims

Ansprüche claims
1. Verfahren zum Betreiben eines KraftstoffSystems (12) einer Brennkraftmaschine (10) , bei dem eine Druckregeleinrichtung (32) mit einem Vorsteuersignal (IDRV) vorgesteuert wird, welches unter Berücksichtigung eines1. A method for operating a fuel system (12) of an internal combustion engine (10), in which a pressure control device (32) with a pilot signal (I DRV ) is precontrolled, which takes into account a
Soll-Drucks (pr soll) in einem Bereich desTarget pressure (pr soll) in a range of
KraftstoffSystems (12), insbesondere einemFuel system (12), in particular a
Kraftstoffdruckspeicher (22), ermittelt wird, dadurch gekennzeichnet, dass bei der Ermittlung des Vorsteuersignals (IDRV) ein Wert für eine durch dieFuel pressure accumulator (22), is determined, characterized in that in the determination of the pilot signal (I D RV) is a value for one by the
Druckregeleinrichtung (32) hindurchströmendePressure control device (32) flowing therethrough
Kraftstoffmenge (qDRv) berücksichtigt wird.Fuel quantity (q D Rv) is taken into account.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass bei der Ermittlung des Werts für die durch die Druckregeleinrichtung (32) hindurchströmende2. The method according to claim 1, characterized in that in the determination of the value for by the pressure regulating device (32) flowing therethrough
Kraftstoffmenge (qDRv) eine von einer Hochdruck- Kraftstoffpumpe (18) geförderte Kraftstoffmenge (qrop) berücksichtigt wird.Fuel quantity (q D Rv) is considered by a high-pressure fuel pump (18) funded amount of fuel (q ro p).
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Hochdruck-Kraftstoffpumpe (18) mechanisch (30) von der Brennkraftmaschine (10) angetrieben wird, und dass bei der Ermittlung des Werts für die durch die Druckregeleinrichtung (32) hindurchströmende Kraftstoffmenge (qDRv) eine Drehzahl (nmot) der Brennkraftmaschine (10) berücksichtigt wird.3. The method according to claim 2, characterized in that the high-pressure fuel pump (18) mechanically (30) from the internal combustion engine (10) is driven, and that in the determination of the value for by the pressure control device (32) flowing therethrough Fuel quantity (q D Rv) a speed (nmot) of the internal combustion engine (10) is taken into account.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei der Ermittlung des Werts für die durch die Druckregeleinrichtung (32) hindurchströmende Kraftstoffmenge (qDRv) eine über einen Injektor (24) in einen Brennraum (26) gelangende Kraftstoffmenge (qΪNj) berücksichtigt wird.4. The method according to any one of the preceding claims, characterized in that in determining the value of the through the pressure control device (32) through flowing fuel quantity (q D Rv) via an injector (24) into a combustion chamber (26) reaching amount of fuel (q JN j).
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei der Ermittlung des Werts für die durch die Druckregeleinrichtung (32) hindurchströmende Kraftstoffmenge (qDRv) eine von einem Injektor (24) abgesteuerte Kraftstoffmenge (qcoN) berücksichtigt wird.5. The method according to any one of the preceding claims, characterized in that in the determination of the value for the through the pressure control device (32) through flowing fuel quantity (q D Rv) from an injector (24) diverted fuel quantity (qcoN) is taken into account.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass aus dem Wert für eine durch die Druckregeleinrichtung (32) hindurchströmende Kraftstoffmenge (qDRv) ein Faktor (KF) ermittelt wird, mit dem ein Roh-Vorsteuersignal (I* DRV) I welches unter Berücksichtigung eines Soll-Drucks (pr soll) in dem Bereich des KraftstoffSystems (12), insbesondere in dem Kraftstoffdruckspeicher (22), ermittelt wird, beaufschlagt wird.6. The method according to any one of the preceding claims, characterized in that from the value for a by the pressure control device (32) through flowing fuel quantity (q D Rv) a factor (KF) is determined with which a raw pilot signal (I * D RV ) I which under the consideration of a target pressure (pr soll) in the range of the fuel system (12), in particular in the fuel pressure accumulator (22) is determined, is acted upon.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei der Ermittlung des Faktors (KF) ein Wert für den aktuellen Druck (pr ist) in dem Bereich des KraftstoffSystems (12), insbesondere in dem Kraftstoffdruckspeicher (22), berücksichtigt wird.7. The method according to any one of the preceding claims, characterized in that in the determination of the factor (KF), a value for the current pressure (pr ist) in the region of the fuel system (12), in particular in the fuel pressure accumulator (22) is taken into account ,
8. Computerprogramm, dadurch gekennzeichnet, dass es zur Anwendung in einem Verfahren nach einem der vorhergehenden8. Computer program, characterized in that it is for use in a method according to one of the preceding
Ansprüche programmiert ist. Claims is programmed.
9. Elektrisches Speichermedium für eine Steuer- und/oder Regeleinrichtung (34) einer Brennkraftmaschine (10), dadurch gekennzeichnet, dass auf ihm ein Computerprogramm zur Anwendung in einem Verfahren der Ansprüche 1 bis 7 abgespeichert ist.9. An electrical storage medium for a control and / or regulating device (34) of an internal combustion engine (10), characterized in that a computer program for use in a method of claims 1 to 7 is stored on it.
10. Steuer- und/oder Regeleinrichtung (34) für eine Brennkraftmaschine (10) , dadurch gekennzeichnet, dass sie zur Anwendung in einem Verfahren nach einem der Ansprüche 1 bis 7 programmiert ist.10. control and / or regulating device (34) for an internal combustion engine (10), characterized in that it is programmed for use in a method according to one of claims 1 to 7.
11. Brennkraftmaschine (10), insbesondere für ein11. internal combustion engine (10), in particular for a
Kraftfahrzeug, dadurch gekennzeichnet, dass sie eine Steuer- und/oder Regeleinrichtung (34) umfasst, welche zur Anwendung in einem Verfahren nach einem der Ansprüche 1 bis 7 programmiert ist. Motor vehicle, characterized in that it comprises a control and / or regulating device (34) which is programmed for use in a method according to one of claims 1 to 7.
EP05797117A 2004-12-09 2005-10-20 Method for operating a fuel system of a combustion engine Active EP1825125B1 (en)

Applications Claiming Priority (2)

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DE102004059330A DE102004059330A1 (en) 2004-12-09 2004-12-09 Method for operating a fuel system of an internal combustion engine
PCT/EP2005/055417 WO2006061288A1 (en) 2004-12-09 2005-10-20 Method for operating a fuel system of a combustion engine

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ATE455949T1 (en) 2010-02-15
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DE102004059330A1 (en) 2006-06-14
JP4518515B2 (en) 2010-08-04
US20080257314A1 (en) 2008-10-23
EP1825125B1 (en) 2010-01-20
US9611800B2 (en) 2017-04-04

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