EP1348072A1 - Method, computer program and control and/or regulation device for operating an internal combustion engine, and corresponding internal combustion engine - Google Patents

Method, computer program and control and/or regulation device for operating an internal combustion engine, and corresponding internal combustion engine

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Publication number
EP1348072A1
EP1348072A1 EP01994597A EP01994597A EP1348072A1 EP 1348072 A1 EP1348072 A1 EP 1348072A1 EP 01994597 A EP01994597 A EP 01994597A EP 01994597 A EP01994597 A EP 01994597A EP 1348072 A1 EP1348072 A1 EP 1348072A1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
internal combustion
combustion engine
fuel line
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
EP01994597A
Other languages
German (de)
French (fr)
Other versions
EP1348072B1 (en
Inventor
Klaus Joos
Jens Wolber
Thomas Frenz
Markus Amler
Hansjoerg Bochum
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 EP1348072A1 publication Critical patent/EP1348072A1/en
Application granted granted Critical
Publication of EP1348072B1 publication Critical patent/EP1348072B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • 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
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure pump
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/065—Introducing corrections for particular operating conditions for engine starting or warming up for starting at hot start or restart
    • 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
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/02—Fuel evaporation in fuel rails, e.g. in common rails
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine

Definitions

  • the invention relates to a method for operating an internal combustion engine, in particular a motor vehicle, in which the fuel is conveyed from a storage container into a fuel line by means of at least one fuel pump and in which the pressure of the fuel is increased depending on an operating state in at least one area of the fuel line.
  • Such a method is known from DE 195 39 885 AI. It is used there on a fuel supply system of an internal combustion engine.
  • the fuel supply system comprises two fuel pumps connected in series and several fuel valves that inject directly into a combustion chamber.
  • a valve device ensures that , during the starting process of the internal combustion engine, one of the two fuel pumps supplies the fuel with an increased pressure Entile fuel promotes. It is thereby achieved that steam bubbles in the fuel line are flushed out of the fuel line or compressed in the fuel line and this makes it possible to start the internal combustion engine in a sufficiently short time.
  • the method proposed in DE 195 39 885 improves the starting behavior of the internal combustion engine considerably. However, it was found that a further improvement in the starting behavior and in particular a shortening of the starting time of the internal combustion engine is desired.
  • the present invention therefore has the task of developing a method of the type mentioned at the outset in such a way that the starting behavior of the internal combustion engine is further improved.
  • This object is achieved in a method of the type mentioned at the outset in that the pressure of the fuel is at least temporarily increased at least in the said area of the fuel line when the internal combustion engine is at rest.
  • the method according to the invention has the advantage that the pressure of the fuel is increased compared to the normal pressure even during the idle time of the internal combustion engine, ie when it is not in operation, which prevents the formation of vapor bubbles from the outset.
  • gas bubbles which have already formed are not flushed out of the fuel lines, but their formation is prevented from the outset. This enables the fuel to be made available to the combustion chambers of the internal combustion engine even faster during the starting process, which accelerates the starting process itself and improves the starting behavior of the internal combustion engine.
  • Increasing the fuel pressure in the fuel line only in the idle state also has the advantage over a constantly increased fuel pressure that the components of the internal combustion engine are subjected to less stress during normal operation. This applies in particular to the fuel pump, the service life of which is extended by the normally lower pressure and also to the fuel lines, which are less susceptible to permeation at the normally lower pressure.
  • the pressure of the fuel is increased at least in the said area of the fuel line in the idle state when the temperature of the internal combustion engine is above a limit value.
  • the formation of vapor bubbles is particularly likely when the fuel in the fuel lines is warm.
  • Such heating of the fuel is in turn to be feared if the internal combustion engine is switched off after a long period of operation and the fuel line, the fuel pump and / or other elements of the fuel system are heated by the hot internal combustion engine due to heat conduction.
  • the increase in fuel pressure in the fuel line also waived in the idle state when the internal combustion engine was started, for example, only for a short time, that is, it did not reach a high operating temperature, and in this respect no heating of the fuel in the fuel line promoting the formation of steam bubbles is to be feared.
  • the pressure of the fuel in the said region of the fuel line remains increased at least during hine of starting the internal combustion engine and preferably during a period after starting the Brennkraftmasc 'is proposed. In this way a safe starting of the internal combustion engine accelerated again and to ensure a quiet "and safe operation of the engine after the start of operation with high reliability.
  • the period of time during which the pressure of the fuel remains increased at least in the area of the fuel line after the internal combustion engine starts depends on the temperature of the internal combustion engine.
  • the likelihood of the formation of vapor bubbles depends on the temperature of the fuel, which in turn depends on the temperature of the internal combustion engine.
  • the pressure of the fuel should remain elevated for a certain period of time, which depends on the temperature of the internal combustion engine. Possibly . the pressure can be lowered again, when the temperature of Brennkraf tMachine 'has fallen below a limit value.
  • a "high-pressure region and a low-pressure region of the fuel line during the phase with increased pressure of the fuel are connected at least in a region of the fuel line, in particular in the resting state of the internal combustion engine with one another.
  • a fuel line with a high-pressure area and a low-pressure area is included, for example
  • the fuel is first conveyed into the low-pressure area of the fuel line by an electric fuel pump and fed to a high-pressure pump driven directly by the internal combustion engine.
  • the fuel is fed directly to the injection valves, which inject the fuel directly into the combustion chambers of the internal combustion engine.
  • the high pressure area and the low pressure area of the fuel line remain separate from one another in the idle state of the internal combustion engine.
  • the high-pressure components in the high-pressure area for example the high-pressure pump, the high-pressure injection valves, a quantity control valve and a pressure control valve, may therefore be exposed to the high pressure in the high-pressure area for a very long period of time. If the high pressure area is connected to the low pressure area during the phase with increased pressure of the fuel, this automatically results in a lowering of the pressure in the high pressure area to a common pressure value, which, however, is higher than the usual pressure value in the low pressure area of the fuel line, so that vapor bubbles are avoided.
  • the components in the high-pressure area of the fuel line are therefore no longer exposed to the particularly high pressure, so that the tightness requirements for these components are alleviated. This reduces the manufacturing costs for the corresponding components and, if necessary, also increases the service life of these components.
  • One way of increasing the pressure of the fuel in said area in the manner mentioned is that a device which sets the pressure of the fuel to a normal level at least in the said area of the fuel line is switched off during the phase with increased fuel pressure becomes.
  • This variant of the method according to the invention is particularly easy to implement.
  • the increase in the pressure of the fuel, at least in the area of the fuel line during the idle state of the internal combustion engine, includes the commissioning of at least one fuel pump after the internal combustion engine has been switched off. Such commissioning of the fuel pump is very easy to implement and contributes to the desired result.
  • the pressure of the fuel to increase at least in said area of the fuel line during the idle state of the internal combustion engine, at least also by increasing the temperature of the fuel in said area of the fuel line.
  • the invention also relates to a computer program which is suitable for carrying out the above method when it is executed on a computer. It is particularly preferred if the computer program is stored on a memory, in particular on a flash memory.
  • the invention relates to a control and / or regulating device for operating an internal combustion engine, in particular a motor vehicle, in which the fuel is conveyed from a storage container into a fuel line by means of at least one fuel pump and in which the pressure of the fuel is dependent on at least one area of the fuel line is increased from an operating state.
  • a control and / or regulating device is known from the market.
  • the control and / or regulating device is suitable for controlling and / or regulating the above method. It is particularly preferred if the control and / or regulating device is provided with a computer program of the type mentioned above.
  • the invention further relates to an internal combustion engine with at least one fuel pump, which fuel in promotes a fuel line, and with a device which can increase the pressure of the fuel at least in a region of the fuel line depending on an operating state of the internal combustion engine.
  • an internal combustion engine is also known from the market. In order to be able to start it better, it is proposed that it be provided with a control and / or regulating device of the type mentioned above.
  • the internal combustion engine have a first pressure setting device with which a normal pressure of the fuel can be adjusted in at least one area of the fuel line.
  • the internal combustion engine is to have a device with which, when the internal combustion engine is at rest, the first pressure setting device can be fluidly separated at least from said area of the fuel line.
  • Figure 1 is a block diagram of an internal combustion engine
  • Figure 2 is a flow diagram of a first method for
  • FIG. 3 shows a flow diagram of a second method for operating the internal combustion engine from FIG. 1.
  • an internal combustion engine bears the reference number 10 overall. It comprises a combustion chamber 12, to which air is supplied via an intake pipe 14. The exhaust gases are discharged via an exhaust pipe 16.
  • the fuel is supplied to the combustion chamber 12 through injection valves 18, only one of which is shown in FIG. 1.
  • the injection valves 18 are connected to a fuel rail 20, which is usually referred to as a “rail”.
  • the fuel is in turn conveyed into the fuel rail 20 by a high pressure pump 22 and pressurized.
  • a high-pressure fuel line 24 is provided between the high-pressure pump 22 and the fuel manifold 20.
  • the high pressure pump 22, the high pressure fuel line 24 and the fuel manifold 20 form a high pressure area of the fuel system
  • a quantity control valve 52 is interposed in the return flow line 50.
  • the quantity control valve 52 is actuated by a magnetic actuator 54. In the de-energized state, the quantity control valve 52 is pressed into its fully open extreme position by a spring 56.
  • the fuel rail 20 is connected to a pressure relief valve 58, which in turn is fluidly connected to the low pressure fuel line 26 at a location between the pressure damper 46 and the filter 30.
  • the pressure relief valve 58 is a spring-loaded ball valve with an opening pressure of approximately 125 bar.
  • the pressure in the fuel rail 20 is detected by a pressure sensor 60, which sends corresponding signals to a control and regulating device 62. This also receives signals from a temperature sensor 64, which taps the temperature of the internal combustion engine 10, for example the temperature of cooling water (not shown).
  • a temperature sensor 64 which taps the temperature of the internal combustion engine 10, for example the temperature of cooling water (not shown).
  • the control and regulating device 62 is also connected to a position transmitter 66 of an ignition lock (not shown).
  • the control and regulating device 62 controls the magnetic actuator 54 of the magnetic control valve 52, the injection valves 18 and the electrical one Fuel pump 32 and the check valve 36 on.
  • the shutoff valve 36 is controlled by the control and regulating device 62 such that it is open and the branch 34a of the branch line 34 is continuous.
  • the fuel delivered by the electric fuel pump 32 from the tank 28 into the low-pressure fuel line 26 is therefore regulated by the pressure regulator 38 to approximately a pressure of 4 bar.
  • the pressure regulator 40 in the second branch 34b of the branch line 34 is not active since it only opens at a pressure of approximately 6 bar in the branch line 34 (it is understood that the pressure in the branch line 34 and the sections 34a and 34b is equal to the pressure in the area of the low-pressure fuel line 26, which lies between the fuel pump 32 and the high-pressure pump 22).
  • the branch line 34 and the components 36, 38 and 40 arranged therein, the low-pressure fuel line 26 and the electric fuel pump 32 thus form a low-pressure region of the fuel line.
  • This "pre-compressed" fuel is compressed to a pressure of approximately 125 bar by the high-pressure pump 22 and is conveyed into the high-pressure fuel line 24 and to the fuel collecting line 20.
  • the flow rate is regulated by the flow control valve 52.
  • An idle state is understood to mean that the internal combustion engine 10 is switched off, that is to say the Crankshaft (not shown) does not rotate and, for example, the ignition is switched off.
  • the method shown in FIG. 2 is stored as a computer program in the control and regulating device 62.
  • a switch-off sequence of the internal combustion engine 10 has been initiated based on the position or a movement of the position transmitter 66 of the ignition lock. If this is the case, it is checked in block 72 whether the temperature T of the internal combustion engine 10 (e.g. the cooling water of the internal combustion engine 10) detected by the temperature sensor 64 is greater than a limit value TG. If this is also the case, the blocking valve 36 is actuated in block 74 by the control and regulating device 62 so that it closes. In block 75, the electric fuel pump 32 is then switched on and, after a specific time interval (block 76), switched off again in block 78. A flag is set in block 80. The program ends in the end block 82. A jump is made to block 82 if the query results of blocks 70 or 72 are negative.
  • T of the internal combustion engine 10 e.g. the cooling water of the internal combustion engine 10
  • the method shown in FIG. 2 has the effect that, when the internal combustion engine 10 is switched off by turning the ignition key in the ignition lock and it is determined that the temperature T of the internal combustion engine is above a limit value TG, the pressure regulator 38 is closed Lock valve 36 is deactivated. If the fuel pump 32 is now switched on in block 75, the pressure control in the low-pressure fuel line 26 is carried out by the second pressure regulator 40 in the branch 34b of the branch line 34, ie the pressure is set to a higher pressure, namely 6 bar in the present case. Due to this increased pressure in the Low pressure fuel line 26 are already created
  • the pressure increase takes place additionally or exclusively due to the heating of the
  • the low-pressure fuel line 26 is fluidly connected to the high-pressure fuel line 24. Accordingly, the same pressure prevails in both fuel lines 24 ′ and 26 and in the fuel collecting line 20, namely the said 6 bar. This pressure is considerably below the pressure that would otherwise be in the high-pressure area of the fuel system. This reduced pressure in the high-pressure area of the fuel system in the idle state of the internal combustion engine considerably reduces the tightness requirements for the components in the high-pressure area, for example the injection valves 18, so that they can be made simpler and cheaper.
  • the blocking valve 36 is opened in block 92, as a result of which the pressure regulator 38 comes into action again and sets the pressure in the low-pressure fuel line 26 to a lower pressure, in the present case 4 bar (the quantity control valve 52 was previously closed, so that the low-pressure fuel line 26 and the high-pressure fuel line 24 are again fluidly separated from each other).
  • the internal combustion engine 10 is then started in block 94 and the flag is deleted in block 96.
  • the method finally ends in block 98. This takes into account that when the temperature of the internal combustion engine is so low that there is no fear of the formation of vapor bubbles in the low-pressure fuel line 26, the internal combustion engine 10 is started with increased pressure of the fuel in the low pressure fuel line 26 is not required.
  • the internal combustion engine 10 is started in block 100.
  • the engine 10 is started by the pressure regulator 40 adjusted increased pressure of the fuel in the low-pressure fuel line 26.
  • the check valve 36 is controlled by the control and regulating device 62 so that it opens (block 103).
  • the first pressure regulator 38 in the branch line 34a is activated again, as a result of which the fuel pressure in the low-pressure fuel line 26 is set to a normal pressure of approximately 4 bar.
  • the time period t in block 102 may depend on the temperature T of the internal combustion engine 10. This ensures that the pressure in the low-pressure fuel line 26 is only reduced to a normal level when the temperature of the internal combustion engine 10 has dropped to such an extent that there is no longer any need to fear the formation of vapor bubbles in the low-pressure fuel line 26.

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

Abstract

The invention relates to a method for operating an internal combustion engine (10), especially an internal combustion engine of a motor vehicle. The inventive method is characterized by delivering the fuel from a storage tank (28) to a fuel line (20, 24, 26, 34) by means of a fuel pump (22, 32). The pressure of the fuel is increased at least in a zone (26) of the fuel line (20, 24, 26, 34) in accordance with an operational state. The pressure of the fuel is at least temporarily increased in said zone (26) of the fuel line (20, 24, 26, 34) in an idle state of the internal combustion engine (10) in order to prevent starting difficulties of the internal combustion engine (10).

Description

Verfahren, Computerprogxamm und Steuer- und/oder Regelcrerät zum Betreiben einer Brennkraftmaschine sowie BrennkraftmaschineMethod, computer program and control and / or regulating device for operating an internal combustion engine and internal combustion engine
Stand der TechnikState of the art
Die Erfindung betrifft ein Verfahren zum Betreiben einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs, bei dem der Kraftstoff aus einem Vorratsbehalter mittels mindestens einer Kraftstoffpumpe in eine Kraftstoffleitung gefördert wird und bei dem der Druck des Kraftstoffs mindestens in einem Bereich der Kraftstoffleitung abhängig von einem Betriebszustand erhöht wird.The invention relates to a method for operating an internal combustion engine, in particular a motor vehicle, in which the fuel is conveyed from a storage container into a fuel line by means of at least one fuel pump and in which the pressure of the fuel is increased depending on an operating state in at least one area of the fuel line.
Ein solches Verfahren ist aus der DE 195 39 885 AI bekannt. Es wird dort an einer Kraftstoffversorgungsanlage einer Brennkraftmaschine angewandt . Die Kraftstoffversorgungsanlage umfasst zwei in Reihe geschaltete Kraftstoffpumpen sowie mehrere, direkt in einen Brennraum einspritzende Kraftstoffventile. Bei dem bekannten Verfahren wird über eine Ventileinrichtung dafür gesorgt, dass' während des Startvorgangs der Brennkraftmaschine eine der beiden Kraftstoffpumpen den Kraftstoff mit einem erhöhten Druck zu den Kraftstoff entilen fördert. Hierdurch wird erreicht, dass Dampfblasen in der Kraftsto fleitung aus der Kraftstoffleitung gespült oder in der Kraftstoffleitung komprimiert werden und hierdurch ein Starten der Brennkraftmaschine in ausreichend kurzer Zeit möglich ist.Such a method is known from DE 195 39 885 AI. It is used there on a fuel supply system of an internal combustion engine. The fuel supply system comprises two fuel pumps connected in series and several fuel valves that inject directly into a combustion chamber. In the known method, a valve device ensures that , during the starting process of the internal combustion engine, one of the two fuel pumps supplies the fuel with an increased pressure Entile fuel promotes. It is thereby achieved that steam bubbles in the fuel line are flushed out of the fuel line or compressed in the fuel line and this makes it possible to start the internal combustion engine in a sufficiently short time.
Das in der DE 195 39 885 vorgeschlagene Verfahren verbessert zwar das Startverhalten der Brennkraftmaschine erheblich. Es wurde jedoch festgestellt, dass noch eine weitere Verbesserung des Startverhaltens und hier insbesondere eine Verkürzung der Startzeit der Brennkraftmaschine gewünscht wird. Die vorliegende Erfindung hat daher die Aufgabe, ein Verfahren der eingangs genannten- rt so weiterzubilden, dass das Startverhalten der Brennkraftmaschine nochmals verbessert wird.The method proposed in DE 195 39 885 improves the starting behavior of the internal combustion engine considerably. However, it was found that a further improvement in the starting behavior and in particular a shortening of the starting time of the internal combustion engine is desired. The present invention therefore has the task of developing a method of the type mentioned at the outset in such a way that the starting behavior of the internal combustion engine is further improved.
Diese Aufgabe wird bei einem Verfahren der eingangs genannten Art dadurch gelöst, dass der Druck des Kraftstoffs mindestens in dem besagten Bereich der Kraftstoffleitung in einem Ruhezustand der Brennkraftmaschine wenigstens zeitweise erhöht wird.This object is achieved in a method of the type mentioned at the outset in that the pressure of the fuel is at least temporarily increased at least in the said area of the fuel line when the internal combustion engine is at rest.
Das erfindungsgemäße Verfahren hat den Vorteil, dass bereits während der Standzeit der Brennkraftmaschine, wenn diese also nicht in Betrieb ist, der Druck des Kraftstoffs gegenüber dem normalen Druck erhöht wird, wodurch die Bildung von Dampfblasen von vornherein vermieden wird. Bei dem erfindungsgemäßen Verfahren werden im Gegensatz zum Stand der Technik also bereits entstandene Gasblasen nicht aus den Kraf stoffleitungen gespült, sondern deren Entstehung wird von vornherein verhindert. Dies ermöglicht es, dass den Brennräumen der Brennkraftmaschine der Kraftstoff noch schneller beim Startvorgang zu Verfügung gestellt wird, was den Startvorgang selbst beschleunigt und das Startverhalten der Brennkraftmaschine verbessert.The method according to the invention has the advantage that the pressure of the fuel is increased compared to the normal pressure even during the idle time of the internal combustion engine, ie when it is not in operation, which prevents the formation of vapor bubbles from the outset. In the method according to the invention, in contrast to the prior art, gas bubbles which have already formed are not flushed out of the fuel lines, but their formation is prevented from the outset. This enables the fuel to be made available to the combustion chambers of the internal combustion engine even faster during the starting process, which accelerates the starting process itself and improves the starting behavior of the internal combustion engine.
Die Erhöhung des Kraftstoffdrucks in der Kraftstoffleitung nur im Ruhezustand hat darüber hinaus gegenüber einem ständig erhöhten Kraftstoffdruck den Vorteil, dass die Komponenten der Brennkraftmaschine im Normalbetrieb weniger belastet werden. Dies gilt insbesondere für die Kraftstoffpumpe, deren Lebensdauer durch den im Normalfall niedrigeren Druck verlängert wird und auch für die Kraftstoffleitungen, welche bei den im Normalfall niedrigeren Druck weniger anfällig gegenüber einer Permeation sind.Increasing the fuel pressure in the fuel line only in the idle state also has the advantage over a constantly increased fuel pressure that the components of the internal combustion engine are subjected to less stress during normal operation. This applies in particular to the fuel pump, the service life of which is extended by the normally lower pressure and also to the fuel lines, which are less susceptible to permeation at the normally lower pressure.
Vorteilhafte Weiterbildungen der Erfindung sind in Unteransprüchen angegeben.Advantageous developments of the invention are specified in the subclaims.
In einer ersten Weiterbildung ist genannt, dass der Druck des Kraftstoffs mindestens in dem besagten Bereich der Kraftstoffleitung im Ruhezustand dann erhöht wird, wenn die Temperatur der Brennkraftmaschine oberhalb eines Grenzwerts liegt . Die Bildung von Dampfblasen ist dann besonders wahrscheinlich, wenn der Kraftstoff in den Kraftstoffleitungen warm ist. Eine solche Erwärmung des Kraftstoffs ist wiederum dann zu befürchten, wenn die Brennkraftmaschine nach einem längeren Betrieb abgestellt wird und durch Wärmeleitung die Kraftstoffleitung, die Kraftstoffpumpe und/oder andere Elemente des KraftstoffSystems von der heißen Brennkraftmaschine erwärmt werden.In a first development it is mentioned that the pressure of the fuel is increased at least in the said area of the fuel line in the idle state when the temperature of the internal combustion engine is above a limit value. The formation of vapor bubbles is particularly likely when the fuel in the fuel lines is warm. Such heating of the fuel is in turn to be feared if the internal combustion engine is switched off after a long period of operation and the fuel line, the fuel pump and / or other elements of the fuel system are heated by the hot internal combustion engine due to heat conduction.
Durch die erfindungsgemäße Weiterbildung des Verfahrens wird diese Erwärmung des Kraftstoffs in derThrough the development of the method according to the invention, this heating of the fuel in the
Kraftstoffleitung berücksichtigt. Andererseits wird auf die Erhöhung des Kraftstoffdrucks in der Kraftstoffleitung auch im Ruhezustand dann verzichtet, wenn die Brennkraftmaschine z.B. nur kurzzeitig gestartet wurde, sie also keine hohe Betriebstemperatur erreicht hat, und insoweit auch keine die Entstehung von Dampfblasen fördernde Erwärmung des Kraftstoffes in der Kraf stoffleitung zu befürchten ist.Fuel line taken into account. On the other hand, the increase in fuel pressure in the fuel line also waived in the idle state when the internal combustion engine was started, for example, only for a short time, that is, it did not reach a high operating temperature, and in this respect no heating of the fuel in the fuel line promoting the formation of steam bubbles is to be feared.
Weiter wird vorgeschlagen, dass der Druck des Kraftstoffs in dem besagten Bereich der Kraftstoffleitung mindestens während des Startens der Brennkraftmaschine und vorzugsweise während eines Zeitraums nach dem Starten der Brennkraftmasc'hine erhöht bleibt . Hierdurch wird ein sicheres Starten der Brennkraftmaschine nochmals beschleunigt und ein ruhiger "und sicherer Betrieb der Brennkraftmaschine nach dem Startvorgang mit hoher Zuverlässigkeit sichergestellt.Next, the pressure of the fuel in the said region of the fuel line remains increased at least during hine of starting the internal combustion engine and preferably during a period after starting the Brennkraftmasc 'is proposed. In this way a safe starting of the internal combustion engine accelerated again and to ensure a quiet "and safe operation of the engine after the start of operation with high reliability.
Dabei wird besonders bevorzugt, wenn die Zeitdauer, während der nach dem Start der Brennkraftmaschine der Druck des Kraftstoffs mindestens in dem besagten Bereich der Kraftstoffleitung erhöht bleibt, von der Temperatur der Brennkraftmaschine abhängt. Wie oben ausgeführt wurde, hängt die Wahrscheinlichkeit der Bildung von Dampfblasen von der Temperatur des Kraftstoffs ab, welche wiederum von der Temperatur der Brennkraftmaschine abhängt . Beim Betrieb einer sehr heißen Brennkraftmaschine, z.B. einer Brennkraftmaschine, die nach längerer Betriebsdauer und kurzem Zwischenstopp wieder angelassen wird, ist die Gefahr des Entstehens von Dampfblasen besonders ausgeprägt. In diesem Fall sollte der Druck des Kraftstoffs über einen bestimmten Zeitraum erhöht bleiben, welcher von der Temperatur der Brennkraftmaschine abhängt . Ggf . kann der Druck wieder abgesenkt werden, wenn die Temperatur der Brennkraf'tmaschine unterhalb eines Grenzwertes abgesunken ist . Bei einer besonders bevorzugten Weiterbildung des erfindungsgemäßen Verfahrens sind ein' Hochdruckbereich und ein Niederdruckbereich der Kraftstoffleitung während der Phase mit erhöhtem Druck des Kraftstoffs mindestens in einem Bereich der Kraftstoffleitung, insbesondere im Ruhezustand der Brennkraftmaschine, miteinander verbunden. Eine solche Kraftstoffleitung mit einem Hochdruckbereich und einem Niederdruckbereich kommt z.B. beiIt is particularly preferred if the period of time during which the pressure of the fuel remains increased at least in the area of the fuel line after the internal combustion engine starts depends on the temperature of the internal combustion engine. As stated above, the likelihood of the formation of vapor bubbles depends on the temperature of the fuel, which in turn depends on the temperature of the internal combustion engine. When operating a very hot internal combustion engine, for example an internal combustion engine which is restarted after a long period of operation and a short stopover, the risk of steam bubbles occurring is particularly pronounced. In this case, the pressure of the fuel should remain elevated for a certain period of time, which depends on the temperature of the internal combustion engine. Possibly . the pressure can be lowered again, when the temperature of Brennkraf tMachine 'has fallen below a limit value. In a particularly preferred development of the method according to the invention a "high-pressure region and a low-pressure region of the fuel line during the phase with increased pressure of the fuel are connected at least in a region of the fuel line, in particular in the resting state of the internal combustion engine with one another. Such a fuel line with a high-pressure area and a low-pressure area is included, for example
Brennkraftmaschinen mit Benzindirekteinspritzung (BDE) zum Einsatz.Internal combustion engines with gasoline direct injection (BDE) are used.
Bei einem solchen Kraftstoffsystem wird der Kraftstoff zunächst von einer elektrischen Kraftstoffpumpe in den Niederdruckbereich der Kraftstoffleitung gefördert und einer von der Brennkraftmaschine direkt angetriebenen Hochdruckpumpe zugeführt. Diese fördert den Kraftstoff unter sehr hohem Druck (bis zu 120 bar) in eine Kraftstoff- Sammelleitung, welche auch als "Rail" bezeichnet wird. Von dieser wird der Kraftstoff direkt den Einspritzventilen zugeführt, welche den Kraftstoff unmittelbar in die Brennräume der Brennkraftmaschine einspritzen.In such a fuel system, the fuel is first conveyed into the low-pressure area of the fuel line by an electric fuel pump and fed to a high-pressure pump driven directly by the internal combustion engine. This pumps the fuel under very high pressure (up to 120 bar) into a fuel manifold, which is also referred to as a "rail". From there, the fuel is fed directly to the injection valves, which inject the fuel directly into the combustion chambers of the internal combustion engine.
Üblicherweise bleiben im Ruhezustand der Brennkraftmaschine der Hochdruckbereich und der Niederdruckbereich der Kraftstoffleitung voneinander getrennt. Die Hochdruckkomponenten des Hochdruckbereichs, z.B. die Hochdruckpumpe, die Hochdruckeinspritzventile, ein Mengensteuerventil und ein Drucksteuerventil, sind somit u.U. während eines sehr langen Zeitraums dem hohen Druck im Hochdruckbereich ausgesetzt. Wird der Hochdruckbereich mit dem Niederdruckbereich während der Phase mit erhöhtem Druck des Kraftstoffs verbunden, ergibt sich hierdurch automatisch eine Absenkung des Drucks im Hochdruckbereich auf einen gemeinsamen Druckwert, welcher jedoch höher liegt als der übliche Druckwert im Niederdruckbereich der Kraftstoffleitung, so dass Dampfblasen vermieden werden.Usually, the high pressure area and the low pressure area of the fuel line remain separate from one another in the idle state of the internal combustion engine. The high-pressure components in the high-pressure area, for example the high-pressure pump, the high-pressure injection valves, a quantity control valve and a pressure control valve, may therefore be exposed to the high pressure in the high-pressure area for a very long period of time. If the high pressure area is connected to the low pressure area during the phase with increased pressure of the fuel, this automatically results in a lowering of the pressure in the high pressure area to a common pressure value, which, however, is higher than the usual pressure value in the low pressure area of the fuel line, so that vapor bubbles are avoided.
Die Komponenten im Hochdruckbereich der Kraftstoffleitung sind somit nicht mehr dem besonders hohen Druck ausgesetzt, so dass die Dichtheitsanforderung an diese Komponenten entschärft sind. Hierdurch werden die Fertigungskosten für die entsprechenden Komponenten reduziert und ggf. erhöht sich auch die Lebensdauer dieser Komponenten.The components in the high-pressure area of the fuel line are therefore no longer exposed to the particularly high pressure, so that the tightness requirements for these components are alleviated. This reduces the manufacturing costs for the corresponding components and, if necessary, also increases the service life of these components.
Eine Möglichkeit, den Druck des Kraftstoffs in dem besagten Bereich in der besagten Weise zu erhöhen, besteht darin, dass eine Einrichtung, welche den Druck des Kraftstoffs mindestens in dem besagten Bereich der Kraftstoffleitung auf ein normales Niveau einstellt, während der Phase mit erhöhten Kraftstoffdruck ausgeschaltet wird. Diese Variante des erfindungsgemäßen Verfahrens ist besonders einfach zu realisieren.One way of increasing the pressure of the fuel in said area in the manner mentioned is that a device which sets the pressure of the fuel to a normal level at least in the said area of the fuel line is switched off during the phase with increased fuel pressure becomes. This variant of the method according to the invention is particularly easy to implement.
Möglich ist auch, dass die Erhöhung des Drucks des Kraftstoffs mindestens in dem besagten Bereich der Kraf stoffleitung während des Ruhezustands der Brennkraftmaschine die Inbetriebnahme mindestens einer Kraftstoffpumpe nach dem Abschalten der Brennkraftmaschine beinhaltet. Eine solche Inbetriebnahme der Kraftstoffpumpe ist sehr leicht realisierbar und trägt zu dem gewünschten Ergebnis bei .It is also possible that the increase in the pressure of the fuel, at least in the area of the fuel line during the idle state of the internal combustion engine, includes the commissioning of at least one fuel pump after the internal combustion engine has been switched off. Such commissioning of the fuel pump is very easy to implement and contributes to the desired result.
Möglich ist auch, dass die Erhöhung des Drucks des Kraftstoffs mindestens in dem besagten Bereich der Kraftstoffleitung während des Ruhezustands der Brennkraftmaschine mindestens auch durch eine Temperaturerhöhung des Kraftstoffs in dem besagten Bereich der Kraftstoffleitung erfolgt. Diese Variante des erfindungsgemäßen Verfahrens macht sich die ansonsten gefürchtete Erhöhung der Temperatur des Kraftstoffs zu Nutze: Durch die Wärmeleitung von der heißen Brennkraftmaschine kann es zu einer solchenIt is also possible for the pressure of the fuel to increase at least in said area of the fuel line during the idle state of the internal combustion engine, at least also by increasing the temperature of the fuel in said area of the fuel line. This variant of the The method according to the invention makes use of the otherwise feared increase in the temperature of the fuel: heat conduction from the hot internal combustion engine can lead to such an increase
Temperaturerhöhung kommen, welche wegen des abgeschlossenen Volumens des Kraftstoffs in der Kraftstoffleitung zu der gewünschten Druckerhöhung führt. Bei dieser Weiterbildung des erfindungsgemäßen Verfahrens wird also die Druckerhöhung auf besonders einfache Art und Weise bewirkt.Temperature increase, which leads to the desired pressure increase due to the closed volume of fuel in the fuel line. In this development of the method according to the invention, the pressure increase is effected in a particularly simple manner.
Die Erfindung betrifft auch ein Computerprogramm, welches zur Durchführung des obigen Verfahrens geeignet ist, wenn es auf einem Computer ausgeführt wird. Dabei ist besonders bevorzugt , wenn das Computerprogramm auf einem Speicher , insbesondere auf einem Flash-Memory, abgespeichert ist.The invention also relates to a computer program which is suitable for carrying out the above method when it is executed on a computer. It is particularly preferred if the computer program is stored on a memory, in particular on a flash memory.
Ferner betrifft die Erfindung ein Steuer- und/oder Regelgerät zum Betreiben einer Brennkraftmaschine, insbesondere eines Kraftfahrzeugs, bei der der Kraftstoff aus einem Vorratsbehalter mittels mindestens einer Kraftstoffpumpe in eine Kraftstoffleitung gefördert wird und bei der der Druck des Kraftstoffs mindestens in einem Bereich der Kraftstoffleitung abhängig von einem Betriebszustand erhöht wird. Ein solches Steuer- und/oder Regelgerät ist vom Markt her bekannt . Um den Startvorgang der Brennkraftmaschine zu beschleunigen, wird erfindungsgemäß vorgeschlagen, dass das Steuer- und/oder Regelgerät zur Steuerung und/oder Regelung des obigen Verfahrens geeignet ist. Besonders bevorzugt ist dabei, wenn das Steuer- und/oder Regelgerät mit einem Computerprogramm der oben genannten Art versehen ist.Furthermore, the invention relates to a control and / or regulating device for operating an internal combustion engine, in particular a motor vehicle, in which the fuel is conveyed from a storage container into a fuel line by means of at least one fuel pump and in which the pressure of the fuel is dependent on at least one area of the fuel line is increased from an operating state. Such a control and / or regulating device is known from the market. In order to accelerate the starting process of the internal combustion engine, it is proposed according to the invention that the control and / or regulating device is suitable for controlling and / or regulating the above method. It is particularly preferred if the control and / or regulating device is provided with a computer program of the type mentioned above.
Die Erfindung betrifft weiterhin eine Brennkraftmaschine mit mindestens einer Kraftstoffpumpe, welche Kraftstoff in eine Kraftstoffleitung fördert, und mit einer Einrichtung, welche den Druck des Kraftstoffs mindestens in einem Bereich der Kraftstoffleitung abhängig von einem Betriebszustand der Brennkraftmaschine erhöhen kann. Auch eine solche Brennkraftmaschine ist vom Markt her bekannt. Um sie besser starten zu können wird vorgeschlagen, dass sie mit einem Steuer- und/oder Regelgerät der oben genannten Art versehen ist .The invention further relates to an internal combustion engine with at least one fuel pump, which fuel in promotes a fuel line, and with a device which can increase the pressure of the fuel at least in a region of the fuel line depending on an operating state of the internal combustion engine. Such an internal combustion engine is also known from the market. In order to be able to start it better, it is proposed that it be provided with a control and / or regulating device of the type mentioned above.
Um die mit dem Steuer- und/oder Regelgerät mögliche Erhöhung des Drucks des Kraftstoffs in der Kra tstoffleitung bei der erfindungsgemäßen Brennkraftmaschine auf möglichst einfache Art und Weise realisieren zu können, wird vorgeschlagen, dass die Brennkraftmaschine eine erste Druckeinstelleinrichtung aufweist, mit der ein normaler Druck des Kraftstoffs mindestens in einem Bereich der Kraftstoffleitung eingestellt werden kann.In order to be able to achieve the possible increase in the pressure of the fuel in the fuel line in the internal combustion engine according to the invention in the simplest possible manner with the control and / or regulating device, it is proposed that the internal combustion engine have a first pressure setting device with which a normal pressure of the fuel can be adjusted in at least one area of the fuel line.
Weiterhin -wird vorgeschlagen, dass sie eine zweite Druckeiηstelleinrichtung aufweist, mit der ein erhöhter Druck des Kraftstoffs mindestens in dem besagten Bereich der Kraftstoffleitung eingestellt werden kann, wobei die erste und die zweite Druckeinstelleinrichtung jeweils mindestens mit dem besagten Bereich der Kraftstoffleitung verbunden sind. Ferner soll die Brennkraftmaschine eine Einrichtung aufweisen, mit der im Ruhezustand der Brennkraftmaschine die erste Druckeinstelleinrichtung mindestens von dem besagten Bereich der Kraftstoffleitung fluidisch getrennt werden kann.It is also proposed that it have a second pressure setting device with which an increased pressure of the fuel can be set at least in said area of the fuel line, the first and second pressure setting devices each being connected at least to said area of the fuel line. Furthermore, the internal combustion engine is to have a device with which, when the internal combustion engine is at rest, the first pressure setting device can be fluidly separated at least from said area of the fuel line.
Die Montage der besagten Komponenten wird dadurch vereinfacht, dass die Druckeinstelleinrichtungen und die Trenneinrichtung in ein Modul integriert sind. ZeichnungThe assembly of said components is simplified in that the pressure setting devices and the separating device are integrated in one module. drawing
Nachfolgend wird ein Ausführungsbeispiel der Erfindung unter Bezugnahme auf die beiliegende Zeichnung im Detail erläutert .An exemplary embodiment of the invention is explained in detail below with reference to the accompanying drawing.
In der Zeichnung zeigen:The drawing shows:
Figur 1 ein Blockschaltbild einer Brennkraftmaschine;Figure 1 is a block diagram of an internal combustion engine;
Figur 2 ein Flussdiagramm eines ersten Verfahrens zumFigure 2 is a flow diagram of a first method for
Betreiben der Brennkraftmaschine von Figur 1; undOperating the internal combustion engine of Figure 1; and
Figur 3 ein Flussdiagramm eines zweiten Verfahrens zum Betreiben der Brennkraftmaschine von Figur 1.FIG. 3 shows a flow diagram of a second method for operating the internal combustion engine from FIG. 1.
Beschreibung des AusführungsbeispielsDescription of the embodiment
In Figur 1 trägt eine Brennkraftmaschine insgesamt das Bezugszeichen 10. Sie umfasst einen Brennraum 12, dem Luft über ein Ansaugrohr 14 zugeführt wird. Die Abgase werden über ein Abgasrohr 16 abgeleitet .In FIG. 1, an internal combustion engine bears the reference number 10 overall. It comprises a combustion chamber 12, to which air is supplied via an intake pipe 14. The exhaust gases are discharged via an exhaust pipe 16.
Der Kraftstoff wird dem Brennraum 12 durch Einspritzventile 18 zugeführt, von denen in Figur 1 nur eines dargestellt ist. Die Einspritzventile 18 sind an eine üblicherweise als "Rail" bezeichnete Kraftstoff-Sammelleitung 20 angeschlossen. Der Kraftstoff wird in die Kraftstoff- Sammelleitung 20 wiederum durch eine Hochdruckpumpe 22 gefördert und unter Druck gesetzt. Zwischen Hochdruckpumpe 22 und Kraftstoff-Sammelleitung 20 ist eine Hochdruck- Kraftstoffleitung 24 vorgesehen. Die Hochdruckpumpe 22, die Hochdruck-Kraftstoffleitung 24 und die Kraftstoff- Sammelleitung 20 bilden einen Hochdruckbereich des KraftstoffSystems The fuel is supplied to the combustion chamber 12 through injection valves 18, only one of which is shown in FIG. 1. The injection valves 18 are connected to a fuel rail 20, which is usually referred to as a “rail”. The fuel is in turn conveyed into the fuel rail 20 by a high pressure pump 22 and pressurized. A high-pressure fuel line 24 is provided between the high-pressure pump 22 and the fuel manifold 20. The high pressure pump 22, the high pressure fuel line 24 and the fuel manifold 20 form a high pressure area of the fuel system
22 und Kraftstoff-Sammelleitung 20 mit der Hochdruck- Kraftstoffleitung 24 und andererseits zwischen Druckdämpfer 46 und der Hochdruckpumpe 22 mit der Niederdruck- Kraftstoffleitung 26 verbunden. In der Rückströmleitung 50 ist ein Mengensteuerventil 52 zwischengeschaltet .22 and fuel manifold 20 connected to the high pressure fuel line 24 and on the other hand between the pressure damper 46 and the high pressure pump 22 to the low pressure fuel line 26. A quantity control valve 52 is interposed in the return flow line 50.
Bei diesem handelt es sich um ein 2/2 -Schaltventil, welches in seiner Extremstellung die Rückströmleitung 50 vollständig sperrt und in der anderen Extremstellung die Rückströmleitung 50 vollständig freigibt. Das Mengensteuerventil 52 wird durch einen Magnetsteller 54 betätigt. Im stromlosen Zustand wird das Mengensteuerventil 52 durch eine Feder 56 in seine vollständig geöffnete Extremstellung gedrückt .This is a 2/2 switching valve, which completely blocks the return flow line 50 in its extreme position and completely releases the return flow line 50 in the other extreme position. The quantity control valve 52 is actuated by a magnetic actuator 54. In the de-energized state, the quantity control valve 52 is pressed into its fully open extreme position by a spring 56.
Die Kraftstoff-Sammelleitung 20 ist mit einem Druckbegrenzungsventil 58 verbunden, welches wiederum fluidisch mit der Niederdruck-Kraftstoffleitung 26 an einer Stelle zwischen dem Druckdämpfer 46 und dem Filter 30 verbunden ist. Bei dem Druckbegrenzungsventil 58 handelt es sich um ein federbelastetes Kugelventil mit einem Öffnungsdruck von ungefähr 125 bar.The fuel rail 20 is connected to a pressure relief valve 58, which in turn is fluidly connected to the low pressure fuel line 26 at a location between the pressure damper 46 and the filter 30. The pressure relief valve 58 is a spring-loaded ball valve with an opening pressure of approximately 125 bar.
Der Druck in der Kraftstoff-Sammelleitung 20 wird von einem Drucksensor 60 erfasst, der entsprechende Signale an ein Steuer- und Regelgerät 62 leitet. Dieses erhält ferner noch Signale von einem Temperatursensor 64, welcher die Temperatur der Brennkraftmaschine 10, z.B. die Temperatur von Kühlwasser (nicht dargestellt) abgreift. Eingangsseitig ist das Steuer- und Regelgerät 62 noch mit einem Stellungsgeber 66 eines Zündschlosses (nicht dargestellt) verbunden. Ausgangsseitig steuert das Steuer- und Regelgerät 62 den Magnetsteller 54 des Magnetsteuerventils 52, die Einspritzventile 18, die elektrische Kraftstoffpumpe 32 und das Sperrventil 36 an.The pressure in the fuel rail 20 is detected by a pressure sensor 60, which sends corresponding signals to a control and regulating device 62. This also receives signals from a temperature sensor 64, which taps the temperature of the internal combustion engine 10, for example the temperature of cooling water (not shown). On the input side, the control and regulating device 62 is also connected to a position transmitter 66 of an ignition lock (not shown). On the output side, the control and regulating device 62 controls the magnetic actuator 54 of the magnetic control valve 52, the injection valves 18 and the electrical one Fuel pump 32 and the check valve 36 on.
Im Normalbetrieb der Brennkraftmaschine 10 wird das Sperrventil 36 von dem Steuer- und Regelgerät 62 so angesteuert, dass es geöffnet ist und der Zweig 34a der Zweigleitung 34 durchgängig ist. Der von der elektrischen Kraftstoffpumpe 32 aus dem Tank 28 in die Niederdruck- Kraftstoffleitung 26 geförderte Kraftstoff wird daher durch den Druckregler 38 ungefähr auf einen Druck von 4 bar eingeregelt. Der Druckregler 40 im zweiten Zweig 34b der Zweigleitung 34 ist nicht akitv, da dieser erst bei einem Druck von ungefähr 6 bar in der Zweigleitung 34 öffnet (es versteht sich, dass der Druck in der Zweigleitung 34 und den Abschnitten 34a und 34b gleich dem Druck in dem Bereich der Niederdruck-Kraftstoffleitung 26 ist, welcher zwischen der Kraftstoffpumpe 32 und der Hochdruckpumpe 22 liegt) .In normal operation of the internal combustion engine 10, the shutoff valve 36 is controlled by the control and regulating device 62 such that it is open and the branch 34a of the branch line 34 is continuous. The fuel delivered by the electric fuel pump 32 from the tank 28 into the low-pressure fuel line 26 is therefore regulated by the pressure regulator 38 to approximately a pressure of 4 bar. The pressure regulator 40 in the second branch 34b of the branch line 34 is not active since it only opens at a pressure of approximately 6 bar in the branch line 34 (it is understood that the pressure in the branch line 34 and the sections 34a and 34b is equal to the pressure in the area of the low-pressure fuel line 26, which lies between the fuel pump 32 and the high-pressure pump 22).
Die Zweigleitung 34 und die in ihr angeordneten Komponenten 36, 38 und 40, die Niederdruck-Kraftstoffleitung 26 und die elektrische Kraftstoffpumpe 32 bilden also einen Niederdruckbereich der Kraftstoffleitung. Von der Hochdruckpumpe 22 wird dieser auf 4 bar "vorverdichtete" Kraftstoff auf einen Druck von ungefähr 125 bar verdichtet und in die Hochdruck-Kraftstoffleitung 24 und zur Kraftstoff-Sammelleitung 20 hin gefördert. Die Durchflussmenge wird durch das Mengensteuerventil 52 geregelt .The branch line 34 and the components 36, 38 and 40 arranged therein, the low-pressure fuel line 26 and the electric fuel pump 32 thus form a low-pressure region of the fuel line. This "pre-compressed" fuel is compressed to a pressure of approximately 125 bar by the high-pressure pump 22 and is conveyed into the high-pressure fuel line 24 and to the fuel collecting line 20. The flow rate is regulated by the flow control valve 52.
Um die Brennkraftmaschine 10 möglichst schnell starten zu können, läuft während des Ruhezustands der Brennkraftmaschine 10 ein Verfahren ab, welches nun unter Bezugnahme auf Figur 2 im Detail erläutert wird. Unter einem Ruhezustand wird verstanden, dass die Brennkraftmaschine 10 ausgeschaltet ist, sich also die Kurbelwelle (nicht dargestellt) nicht dreht und beispielsweise auch die Zündung ausgeschaltet ist. Das in Figur 2 dargestellte Verfahren ist als Computerprogramm im Steuer- und Regelgerät 62 abgelegt .In order to be able to start the internal combustion engine 10 as quickly as possible, a process runs during the idle state of the internal combustion engine 10, which is now explained in detail with reference to FIG. 2. An idle state is understood to mean that the internal combustion engine 10 is switched off, that is to say the Crankshaft (not shown) does not rotate and, for example, the ignition is switched off. The method shown in FIG. 2 is stored as a computer program in the control and regulating device 62.
Nach einem Startblock 68 wird im Block 70 geprüft, ob aufgrund der Stellung bzw. einer Bewegung des Stellungsgebers 66 des Zündschlosses eine Ausschaltsequenz der Brennkraftmaschine 10 eingeleitet wurde. Ist dies der Fall, wird im Block 72 geprüft, ob die vom Temperatursensor 64 erfasste Temperatur T der Brennkraftmaschine 10 (z.B. des Kühlwassers der Brennkraftmaschine 10) größer ist als ein Grenzwert TG. Ist auch dies der Fall, wird im Block 74 vom Steuer- und Regelgerät 62 das Sperrventil 36 so angesteuert, dass es schließt. Im Block 75 wird dann die elektrische Kraftstoffpumpe 32 eingeschaltet und nach Ablauf eines bestimmten Zeitintervalls (Block 76) im Block 78 wieder ausgeschaltet. Im Block 80 wird ein Flag gesetzt. Das Programm endet im Endblock 82. Zum Block 82 wird auch gesprungen, wenn die Abfrageergebnisse der Blöcke 70 oder 72 negativ sind.After a start block 68, it is checked in block 70 whether a switch-off sequence of the internal combustion engine 10 has been initiated based on the position or a movement of the position transmitter 66 of the ignition lock. If this is the case, it is checked in block 72 whether the temperature T of the internal combustion engine 10 (e.g. the cooling water of the internal combustion engine 10) detected by the temperature sensor 64 is greater than a limit value TG. If this is also the case, the blocking valve 36 is actuated in block 74 by the control and regulating device 62 so that it closes. In block 75, the electric fuel pump 32 is then switched on and, after a specific time interval (block 76), switched off again in block 78. A flag is set in block 80. The program ends in the end block 82. A jump is made to block 82 if the query results of blocks 70 or 72 are negative.
Durch das in Figur 2 dargestellte Verfahren wird bewirkt, dass dann, wenn die Brennkraftmaschine 10 durch eine Drehung des Zündschlüssels im Zündschloss ausgeschaltet wird, und wenn festgestellt wird, dass die Temperatur T der Brennkraftmaschine oberhalb eines Grenzwerts TG liegt, der Druckregler 38 durch das geschlossene Sperrventil 36 deaktiviert wird. Wird nun die Kraftstoffpumpe 32 im Block 75 eingeschaltet, erfolgt die Druckregelung in der Niederdruck-Kraftstoffleitung 26 durch den zweiten Druckregler 40 im Zweig 34b der Zweigleitung 34, d.h. der Druck wird auf einen höheren Druck, nämlich vorliegend 6 bar, eingestellt. Durch diesen erhöhten Druck in der Niederdruck-Kraftstoffleitung 26 werden bereits entstandeneThe method shown in FIG. 2 has the effect that, when the internal combustion engine 10 is switched off by turning the ignition key in the ignition lock and it is determined that the temperature T of the internal combustion engine is above a limit value TG, the pressure regulator 38 is closed Lock valve 36 is deactivated. If the fuel pump 32 is now switched on in block 75, the pressure control in the low-pressure fuel line 26 is carried out by the second pressure regulator 40 in the branch 34b of the branch line 34, ie the pressure is set to a higher pressure, namely 6 bar in the present case. Due to this increased pressure in the Low pressure fuel line 26 are already created
Dampfblasen komprimiert und die Entstehung neuerVapor bubbles compress and new ones emerge
Dampfblasen zuverlässig verhindert . In einem nicht dargestellten Ausführungsbeispiel erfolgt die Druckerhöhung zusätzlich oder ausschließlich aufgrund der Erwärmung desVapor bubbles reliably prevented. In an embodiment, not shown, the pressure increase takes place additionally or exclusively due to the heating of the
Kraftstoffes durch Wärmeleitung von der heißen Brennkraftmaschine.Fuel by heat conduction from the hot internal combustion engine.
Das das 2/2 -Mengensteuerventil 52 im stromlosen Ruhezustand der Brennkraftmaschine 10 von der Feder 56 in seine vollständig geöffnete Stellung gedrückt wird, ist die Niederdruck-Kraftstoffleitung 26 fluidisch mit der Hochdruck-Kraftstoffleitung 24 verbunden. In beiden Kraftstoffleitungen 24' und 26 und in der Kraftstoff- Sammelleitung 20 herrscht demnach der gleiche Druck, nämlich die besagten 6 bar. Dieser Druck liegt erheblich unterhalb des sonst im Hochdruckbereich des KraftstoffSystems liegenden Druck. Durch diesen im Ruhezustand der Brennkrtaftmaschine abgesenkten Druck im Hochdruckbereich des KraftstoffSystems werden die Dichrigkeitsanforderungen an die Komponenten im Hochdruckbereich, beispielsweise die Einspritzventile 18, erheblich reduziert, so dass diese einfacher und preiswerter ausgebildet sein können.Since the 2/2 quantity control valve 52 is pressed into its fully open position by the spring 56 in the de-energized idle state of the internal combustion engine 10, the low-pressure fuel line 26 is fluidly connected to the high-pressure fuel line 24. Accordingly, the same pressure prevails in both fuel lines 24 ′ and 26 and in the fuel collecting line 20, namely the said 6 bar. This pressure is considerably below the pressure that would otherwise be in the high-pressure area of the fuel system. This reduced pressure in the high-pressure area of the fuel system in the idle state of the internal combustion engine considerably reduces the tightness requirements for the components in the high-pressure area, for example the injection valves 18, so that they can be made simpler and cheaper.
Beim Starten der Brennkraftmaschine 10 wird folgendermaßen vorgegangen (das entsprechende und in Figur 3 dargestellte Verfahren ist ebenfalls als Computerprogramm im Steuer- und Regelgerät 62 abgelegt) :When starting the internal combustion engine 10, the procedure is as follows (the corresponding method shown in FIG. 3 is also stored as a computer program in the control and regulating device 62):
Nach einem Startblock 84 wird im Block 86 abgefragt, ob z.B. aufgrund einer entsprechenden Bewegung des Schlüssels im Zündschloss, welche durch den Stellungsgeber 66 erfasst wird, eine Einschaltsequenz der Brennkraftmaschine 10 abläuft. Ist dies der Fall, wird im Block 88 abgefragt, ob das Flag gesetzt.ist. Ist dies ebenfalls der Fall, was darauf hinweist, dass während des vorhergegangenen Ruhezustands der Brennkraftmaschine 10 ein erhöhter Kraftstoffdruck in der Niederdruck-Kraftstoffleitung 26 eingestellt wurde, wird im Block 90 die vom Temperatursensor 64 festgestellte Temperatur T der Brennkraftmaschine 10 abgefragt und mit einem Grenzwert TG verglichen .After a start block 84, a query is made in block 86 as to whether, for example, due to a corresponding movement of the key in the ignition lock, which is detected by the position transmitter 66, an activation sequence of the internal combustion engine 10 expires. If this is the case, a query is made in block 88 as to whether the flag is set . is. If this is also the case, which indicates that an increased fuel pressure in the low-pressure fuel line 26 was set during the previous idle state of the internal combustion engine 10, the temperature T of the internal combustion engine 10 determined by the temperature sensor 64 is queried in block 90 and with a limit value TG compared .
Liegt die tatsächliche Temperatur T der Brennkraftmaschine 10 unterhalb des Grenzwerts TG, wird im Block 92 das Sperrventil 36 geöffnet, wodurch der Druckregler 38 wieder in Aktion tritt und den Druck in der Niederdruck- Kraftstoffleitung 26 auf einen niedrigeren Druck, vorliegend 4 bar, einstellt (das Mengensteuerventil 52 wurde zuvor geschlossen, so das die Niederdruck- Kraftstoffleitung 26 und die Hochdruck-Kraftstof leitung 24 wieder fluidisch voneinander getrennt sind) . Anschließend wird im Block 94 die Brennkraftmaschine 10 gestartet und im Block 96 das Flag gelöscht. Das Verfahren endet schließlich im Block 98. Hierdurch wird berücksichtigt, dass dann, wenn die Temperatur der Brennkraftmaschine so niedrig ist, dass die Bildung von Dampfblasen in der Niederdruck- Kraftstoffleitung 26 nicht zu befürchten ist, das Starten der Brennkraftmaschine 10 mit erhöhtem Druck des Kraftstoffs in der Niederdruck-Kraftstoffleitung 26 nicht erforderlich ist.If the actual temperature T of the internal combustion engine 10 is below the limit value TG, the blocking valve 36 is opened in block 92, as a result of which the pressure regulator 38 comes into action again and sets the pressure in the low-pressure fuel line 26 to a lower pressure, in the present case 4 bar ( the quantity control valve 52 was previously closed, so that the low-pressure fuel line 26 and the high-pressure fuel line 24 are again fluidly separated from each other). The internal combustion engine 10 is then started in block 94 and the flag is deleted in block 96. The method finally ends in block 98. This takes into account that when the temperature of the internal combustion engine is so low that there is no fear of the formation of vapor bubbles in the low-pressure fuel line 26, the internal combustion engine 10 is started with increased pressure of the fuel in the low pressure fuel line 26 is not required.
Liegt die tatsächliche Temperatur T der Brennkraftmaschine jedoch oberhalb des Grenzwerts TG, liegt also ein sog. "Heißstart" vor, wird im Block 100 die Brennkraftmaschine 10 gestartet. Der Start der Brennkraftmaschine 10 erfolgt in diesem Fall also mit dem durch den Druckregler 40 eingestellten erhöhten Druck des Kraftstoffs in der Niederdruck-Kraftstoffleitung 26. Nach einem Zeitablauf t, welcher im Block 102 festgestellt wird, wird das Sperrventil 36 von dem Steuer- und Regelgerät 62 so angesteuert, dass es öffnet (Block 103) . Hierdurch wird wieder der erste Druckregler 38 in der Zweigleitung 34a aktiviert, wodurch der Kraftstoffdruck in der Niederdruck- Kraftstoffleitung 26 auf einen normalen Druck von ungefähr 4 bar eingestellt wird.However, if the actual temperature T of the internal combustion engine is above the limit value TG, ie if there is a so-called "hot start", the internal combustion engine 10 is started in block 100. In this case, the engine 10 is started by the pressure regulator 40 adjusted increased pressure of the fuel in the low-pressure fuel line 26. After a time t, which is determined in block 102, the check valve 36 is controlled by the control and regulating device 62 so that it opens (block 103). As a result, the first pressure regulator 38 in the branch line 34a is activated again, as a result of which the fuel pressure in the low-pressure fuel line 26 is set to a normal pressure of approximately 4 bar.
Dadurch, dass der Druck in der Niederdruck- Kraftstoffleitung 26 erst nach Ablauf einer bestimmten Zeit nach dem Starten der Brennkraftmaschine 10 abgesenkt wird, wird sichergestellt, dass während des gesamten Startvorgangs der Brennkraftmaschine 10 und auch noch während eines ausreichend langen Zeitraums, während dem die Brennkraftmaschine 10 abkühlen kann, ein erhöhter Kraftstoffdruck vorliegt und hierdurch das Vorhandensein von Dampfblasen in der Niederdruck-Kraftstoffleitung 26 verhindert wird. Im Block 104 wird das Flag gelöscht.The fact that the pressure in the low-pressure fuel line 26 is only lowered after a certain time has elapsed after starting the internal combustion engine 10 ensures that during the entire starting process of the internal combustion engine 10 and also for a sufficiently long period during which the internal combustion engine 10 can cool down, there is an increased fuel pressure, and the presence of vapor bubbles in the low-pressure fuel line 26 is thereby prevented. In block 104, the flag is cleared.
In einem nicht dargestellten Ausführungsbeispiel kann die Zeitdauer t im Block 102 von der Temperatur T der Brennkraftmaschine 10 abhängen. Hierdurch wird sichergestellt, dass der Druck in der Niederdruck- Kraftstoffleitung 26 erst dann wieder auf ein normales Niveau abgesenkt wird, wenn die Temperatur der Brennkraftmaschine 10 soweit abgesunken ist, dass eine Bildung von Dampfblasen in der Niederdruck- Kraftstoffleitung 26 nicht mehr zu befürchten ist. In an exemplary embodiment not shown, the time period t in block 102 may depend on the temperature T of the internal combustion engine 10. This ensures that the pressure in the low-pressure fuel line 26 is only reduced to a normal level when the temperature of the internal combustion engine 10 has dropped to such an extent that there is no longer any need to fear the formation of vapor bubbles in the low-pressure fuel line 26.

Claims

Ansprüche Expectations
1. Verfahren zum Betreiben einer Brennkraftmaschine (10) insbesondere eines Kraftfahrzeugs, bei dem der Kraftstoff aus einem Vorratsbehalter (28) mittels mindestens einer Kraftstoffpumpe ("22, 32) in eine Kraftstoffleitung (20, 24, 26, 34) gefördert wird und bei dem der Druck des Kraftstoffs mindestens in einem Bereich (26) der1. Method for operating an internal combustion engine (10), in particular a motor vehicle, in which the fuel is conveyed from a storage container (28) by means of at least one fuel pump ("22, 32) into a fuel line (20, 24, 26, 34) and at which the pressure of the fuel at least in a region (26) of the
Kraftstoffleitung (20, 24, 26, 34) abhängig von einem Betriebszustand erhöht wird, dadurch gekennzeichnet, dass der Druck des Kraftstoffs mindestens in dem besagten Bereich (24) der Kraftstof leitung (20, 24, 26, 34) in einem Ruhezustand der Brennkraftmaschine (10) wenigstens zeitweise erhöht wird (75) .Fuel line (20, 24, 26, 34) is increased depending on an operating state, characterized in that the pressure of the fuel at least in said area (24) of the fuel line (20, 24, 26, 34) in an idle state of the internal combustion engine (10) is increased at least temporarily (75).
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Druck des Kraftstoffs mindestens in dem besagten Bereich (24) der Kraftstoffleitung (20, 24, 26, 34) im2. The method according to claim 1, characterized in that the pressure of the fuel at least in said area (24) of the fuel line (20, 24, 26, 34) in
Ruhezustand dann erhöht -wird (75) , wenn die Temperatur (T) der Brennkraftmaschine (10) oberhalb eines Grenzwerts (TG) liegt (72) .The idle state is then increased (75) when the temperature (T) of the internal combustion engine (10) is above a limit value (TG) (72).
3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der Druck des Kraftstoffs in dem besagten Bereich (26) der Kraftstoffleitung (20, 24, 26, 34) mindestens während des Startens (100) der Brennkraftmaschine (10) und vorzugsweise während eines3. The method according to any one of claims 1 or 2, characterized in that the pressure of the fuel in said area (26) of the fuel line (20, 24, 26, 34) at least during the start (100) of the internal combustion engine (10) and preferably during a
ERSATZBLATT Zeitraums (102) nach dem Starten (100) der Brennkraftmaschine (10) erhöht bleibt.SUBSTITUTE SHEET Period (102) after starting (100) the internal combustion engine (10) remains increased.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Zeitdauer, während der nach dem Start der4. The method according to claim 3, characterized in that the time period during which after the start of
Brennkraftmaschine der Druck des Kraftstoffs mindestens in dem besagten Bereich der Kraftstoffleitung erhöht bleibt, von der Temperatur der Brennkraftmaschine abhängt.Internal combustion engine, the pressure of the fuel remains elevated at least in said area of the fuel line, depending on the temperature of the internal combustion engine.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Hochdruckbereich (20, 24) und ein Niederdruckbereich (26, 34) der. Kraftstoffleitung (20, 24, 26, 34) während der Phase mit- erhöhtem Druck des Kraftstoffs mindestens in einem Bereich' (26) der Kra tsto fleitung (20, 24, 26, 34), insbesondere im Ruhezustand der Brennkraftmaschine (10), miteinander verbunden sind.5. The method according to any one of the preceding claims, characterized in that a high pressure area (20, 24) and a low pressure area (26, 34). Fuel line (20, 24, 26, 34) during the phase with increased pressure of the fuel at least in a region ' (26) of the fuel line (20, 24, 26, 34), in particular when the internal combustion engine (10) is at rest, are interconnected.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Einrichtung (38), welche den Druck des Kraftstoffs mindestens in dem besagten Bereich (26) der Kraftstoffleitung (20, 24, 26, 34) auf ein normales Niveau einstellt, während der Phase mit erhöhtem •Kraftstoffdruck ausgeschaltet wird (74).6. The method according to any one of the preceding claims, characterized in that a device (38) which adjusts the pressure of the fuel to a normal level at least in said region (26) of the fuel line (20, 24, 26, 34) while the phase with increased • fuel pressure is switched off (74).
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Erhöhung des Drucks des Kraftstoffs mindestens in dem besagten Bereich (26) der Kraftstoffleitung (20, 24, 26, 34) während des Ruhezustands der Brennkraftmaschine (10) die Inbetriebnahme mindestens einer Kraftstoffpumpe (32) nach dem Abschalten (70) der Brennkraftmaschine (10) beinhaltet (75) .7. The method according to any one of the preceding claims, characterized in that the increase in the pressure of the fuel at least in said area (26) of the fuel line (20, 24, 26, 34) during the idle state of the internal combustion engine (10) the commissioning of at least one Fuel pump (32) after switching off (70) the internal combustion engine (10) includes (75).
8. Verfahren nach einem der vorhergehenden Ansprüche,8. The method according to any one of the preceding claims,
TT dadurch gekennzeichnet, dass die Erhöhung, des Drucks des Kraftstoffs mindestens in dem besagten Bereich (26) der Kraftstoffleitung (20, 24, 26, 34) während des Ruhezustands der Brennkraftmaschine (10) mindestens auch durch eine Temperaturerhöhung des Kraftstoffs in dem besagten Bereich (26) der Kraftstoffleitung (20, 24, 26, 34) erfolgt.TT characterized in that the increase in the pressure of the fuel at least in said area (26) of the fuel line (20, 24, 26, 34) during the idle state of the internal combustion engine (10) at least also by an increase in temperature of the fuel in said area ( 26) of the fuel line (20, 24, 26, 34).
9. Computerprogramm, dadurch gekennzeichnet, dass es zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 8 geeignet ist, wenn es auf einem Computer ausgeführt wird.9. Computer program, characterized in that it is suitable for performing the method according to one of claims 1 to 8 when it is executed on a computer.
10. Computerprogramm nach Anspruch 9, dadurch gekennzeichnet, dass es auf einem Speicher, insbesondere auf einem Flash-Memory, abgespeichert ist.10. Computer program according to claim 9, characterized in that it is stored on a memory, in particular on a flash memory.
11. Steuer- und/oder Regelgerät (62) zum Betreiben einer Brennkraftmaschine (10) insbesondere eines Kraftfahrzeugs, bei der der Kraftstoff aus einem Vorratsbehalter (28) mittels mindestens einer Kraftstoffpumpe (22, 32) in eine Kraftstoffleitung (20, 24, 26, 34) gefördert wird und bei der der Druck des Kraftstoffs mindestens in einem Bereich (26) der Kraftstoffleitung (20, 24, 26, 34) abhängig von einem Betriebszustand erhöht wird, dadurch gekennzeichnet, dass es zur Steuerung und/oder Regelung des Verfahrens nach einem der Ansprüche 1 bis 8 geeignet ist.11. Control and / or regulating device (62) for operating an internal combustion engine (10), in particular a motor vehicle, in which the fuel from a storage container (28) by means of at least one fuel pump (22, 32) into a fuel line (20, 24, 26 , 34) and in which the pressure of the fuel is increased at least in an area (26) of the fuel line (20, 24, 26, 34) depending on an operating state, characterized in that it is used to control and / or regulate the method is suitable according to one of claims 1 to 8.
12. Steuer- und/oder Regelgerät (62) nach Anspruch 11, dadurch gekennzeichnet, dass es mit einem Computerprogramm nach einem der Ansprüche 9 oder 10 versehen ist.12. Control and / or regulating device (62) according to claim 11, characterized in that it is provided with a computer program according to one of claims 9 or 10.
13. Brennkraftmaschine (10) mit mindestens einer Kraftstoffpumpe (22, 32) , welche Kraftstoff in eine Kraftstoffleitung (20, 24, 26, 34) fördert, und mit einer Einrichtung (32, 36, 38) , welche den Druck des Kraftstoffs13. Internal combustion engine (10) with at least one fuel pump (22, 32), which delivers fuel into a fuel line (20, 24, 26, 34), and with a device (32, 36, 38) that controls the pressure of the fuel
ERSATZBLATT mindestens in einem Bereich (26) der Kraftstoffleitung (20, 24, 26, 34) abhängig von einem Betriebszustand der Brennkraftmaschine (10) erhöhen kann, dass es mit einem Steuer- und/oder Regelgerät (62) nach einem der Ansprüche 11 oder 12 versehen ist.SUBSTITUTE SHEET at least in one area (26) of the fuel line (20, 24, 26, 34), depending on an operating state of the internal combustion engine (10), it can be increased by a control and / or regulating device (62) according to one of claims 11 or 12 is provided.
14. Brennkraftmaschine nach Anspruch 13, dadurch gekennzeichnet, dass sie eine erste Druckeinstelleinrichtung (38) aufweist, mit der ein normaler Druck des Kraftstoffs mindestens in einem Bereich (26) der Kraftstoffleitung (20, 24, 26, 34) eingestellt werden kann, dass sie eine zweite Druckeinstelleinrichtung (40) aufweist, mit der ein erhöhter Druck des Kraftstoffs mindestens in dem besagten Bereich (26) der Kraftstoffleitung (20, 24, 26, 34) eingestellt werden kann, wobei die erste (38) und die zweite14. Internal combustion engine according to claim 13, characterized in that it has a first pressure setting device (38) with which a normal pressure of the fuel can be set at least in a region (26) of the fuel line (20, 24, 26, 34) that it has a second pressure setting device (40) with which an increased pressure of the fuel can be set at least in said area (26) of the fuel line (20, 24, 26, 34), the first (38) and the second
Druckeinstelleinrichtung (40) jeweils mindestens mit dem besagten Bereich (26) der Kraftstoffleitung (20, 24, 26, 34) verbunden sind, und dass sie ferner eine Einrichtung (36) aufweist, mit der im Ruhezustand derPressure setting device (40) are each connected at least to said area (26) of the fuel line (20, 24, 26, 34), and that it further comprises a device (36) with which the
Brennkraftmaschine (10) die erste Druckeinstelleinrichtung (38) mindestens von dem besagten Bereich (26) der Kraftstoffleitung (20, 24, 26, 34) fluidisch getrennt werden kann.Internal combustion engine (10), the first pressure setting device (38) can be at least fluidly separated from said area (26) of the fuel line (20, 24, 26, 34).
15. Brennkraftmaschine nach Anspruch 14, dadurch gekennzeichnet, dass die Druckeinstelleinrichtungen (38, 40) und die Trenneinrichtung (36) in ein Modul integriert sind.15. Internal combustion engine according to claim 14, characterized in that the pressure setting devices (38, 40) and the separating device (36) are integrated in one module.
ERSATZBLATT SUBSTITUTE SHEET
EP01994597A 2000-12-12 2001-12-06 Method, computer program and control and/or regulation device for operating an internal combustion engine, and corresponding internal combustion engine Expired - Lifetime EP1348072B1 (en)

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US20030145830A1 (en) 2003-08-07
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