WO2016062570A1 - Method for controlling an electrically controllable suction valve - Google Patents

Method for controlling an electrically controllable suction valve Download PDF

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Publication number
WO2016062570A1
WO2016062570A1 PCT/EP2015/073560 EP2015073560W WO2016062570A1 WO 2016062570 A1 WO2016062570 A1 WO 2016062570A1 EP 2015073560 W EP2015073560 W EP 2015073560W WO 2016062570 A1 WO2016062570 A1 WO 2016062570A1
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WO
WIPO (PCT)
Prior art keywords
suction valve
pressure
pressure pump
internal combustion
combustion engine
Prior art date
Application number
PCT/EP2015/073560
Other languages
German (de)
French (fr)
Inventor
Achim Koehler
Frieder Necker
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
Priority to KR1020177013602A priority Critical patent/KR20170072926A/en
Priority to EP15781621.6A priority patent/EP3209879B1/en
Priority to CN201580057414.0A priority patent/CN107148514B/en
Publication of WO2016062570A1 publication Critical patent/WO2016062570A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time
    • 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
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0606—Fuel temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • 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

Definitions

  • the invention relates to a method for controlling an electrically controllable suction valve for controlling the delivery rate of a high pressure pump in a fuel injection system, in particular in a common rail injection system, an internal combustion engine.
  • a high pressure pump in a fuel injection system serves to deliver fuel to high pressure.
  • the high-pressure pump has at least one pump element with a high-pressure element space, in which the fuel is compressed.
  • the fuel delivered for high pressure is then fed via a high-pressure outlet to a high-pressure accumulator, the so-called rail.
  • a high-pressure accumulator the so-called rail.
  • the fuel under high pressure is injected into a combustion chamber of the internal combustion engine.
  • a suction valve which may be designed for example as a simple check valve. For volume control this is then preceded by a metering unit, which allows the metering of a defined amount of fuel.
  • a metering unit which allows the metering of a defined amount of fuel.
  • an electrically controllable suction valve can also be used for flow control, so that the metering unit can be dispensed with.
  • the electrically controllable suction valve can be designed as a normally open or normally closed valve. In both cases, usually a magnetic actuator acts on a valve member of the suction valve to close this against the spring force of a spring or open.
  • the flow control via an electrically controllable suction valve is generally carried out in such a way that the suction valve remains open during the suction phase of the high-pressure pump in order to fill the high-pressure element space of the high-pressure pump almost completely with fuel. This is still no metering of a defined amount of fuel. This happens only in the subsequent production phase, in which the suction valve remains open until an excess amount of fuel from the high-pressure element chamber has been displaced back into the inlet region of the high-pressure pump. The closing time of the suction valve during the delivery phase therefore determines the delivery rate of the high-pressure pump.
  • the suction valve To promote fuel to high pressure, the suction valve must be closed because otherwise no pressure in the high pressure element space of the high pressure pump can be built.
  • the pressure building up in the high-pressure element chamber when the suction valve is closed loads the engine components of the high-pressure pump, since these must work against this pressure.
  • the load can be minimized by providing a sufficient amount of fuel to lubricate the engine components.
  • this is not always possible, so that the lubrication conditions in the engine room of the high-pressure pump are insufficient.
  • External influences, such as high outside temperatures, can lead to the same result. The result is increased wear on the engine components.
  • the invention is therefore based on the object to provide a method for controlling an electrically controllable suction valve for controlling the flow rate of a high-pressure pump, which has a positive effect on the robustness of the high-pressure pump.
  • the method with the features of claim 1 is proposed.
  • the suction valve is controlled in dependence on at least one parameter, the Has influence on the lubrication conditions in an engine room of the high-pressure pump.
  • the parameter is related to the
  • the suction valve can thus be controlled as a function of the actual lubrication conditions in the engine room of the high-pressure pump, wherein the parameter serves as a trigger for the control of the suction valve.
  • the suction valve is preferably controlled such that it initially remains open in insufficient lubrication conditions to prevent pressure build-up in the high pressure element space of the high-pressure pump. If then a sufficient amount of fuel to lubricate the engine components available, which in turn is indicated by the at least one parameter, the suction valve can be closed.
  • the suction valve designed as a normally open valve, the magnetic plate is energized for this purpose.
  • the energization of the magnetic actuator is terminated for this purpose.
  • the inventive method is therefore ensured that a pressure build-up in the high-pressure element space of the high-pressure pump takes place only when the lubrication conditions in the region of the engine of the high-pressure pump are to be considered sufficient. This is the case, in particular, when there is sufficient fuel in the engine room to form a hydrodynamic lubricant film.
  • a hydrodynamic lubricating film serves to reduce friction in the Contact area of two engine components, such as between a roller and a roller shoe of a cam or Exzentertriebmaschines the high pressure pump. The load on the engine components and the closure of these engine components is significantly reduced in this way, so that the robustness of the high-pressure pump increases.
  • the parameter is preferably used as a trigger in the control of the electrically controllable suction valve.
  • a parameter describing the operating state of the internal combustion engine such as, for example, the rotational speed, the operating time or the like, can be used as the parameter.
  • a parameter may be used which describes the conditions in the engine room, such as the fuel temperature, the fuel pressure or the like.
  • a corresponding sensor for detecting the characteristics is usually already available, so that it can be used. If external influences, such as the outside temperature, should be taken into account in the control of the suction valve, it is also necessary to detect these by means of a corresponding sensor.
  • the start of the internal combustion engine the closing of the suction valve is delayed in time. This has the consequence that the pressure build-up in the high pressure element space of the high pressure pump is delayed in time.
  • the engine room of the high-pressure pump can fill with fuel, so that there are sufficient lubricating conditions at the start of the internal combustion engine.
  • the time delay is 0.1 to 1 second. This period of time has proven to be sufficient in the context of experiments to produce favorable lubrication conditions.
  • the suction valve is opened so that pressure in the high-pressure element chamber of the high-pressure pump is reduced.
  • the pressure reduction in the high pressure element space of High-pressure pump has no effect on the pressure in the connected rail, since the high pressure outlet is usually realized by a check valve, so that it is ensured that a sufficiently high rail pressure when restarting the internal combustion engine is available.
  • the pressure reduction in the high-pressure element space of the high-pressure pump serves primarily to reduce the load on the engine components. Because the suction valve is opened when stopping the engine, fuel from the high-pressure element space is pushed back into the inlet region of the high-pressure pump until a large pressure equalization occurs. Since there is low pressure in the inlet area, the pressure in the high-pressure element space drops.
  • a suction valve designed as a normally open valve is used.
  • the control of the suction valve is carried out in such a way that a drive current is always applied when the suction valve is to be closed. Accordingly, the closing time of the suction valve can be determined via the control.
  • a suction valve designed as a normally closed valve is used in carrying out the method according to the invention.
  • the drive current must be removed. This in turn then the closing time of the suction valve can be fixed.
  • the inventive method allows a low-wear operation of the high-pressure pump.
  • the robustness of the high-pressure pump is thus increased.
  • the method is therefore particularly suitable for fuel injection systems intended for fuel-critical markets.
  • the starting pressure which is currently limited to 300 bar in common-rail high-pressure pumps, can be applied freely.
  • a positive side effect is that no more temperature limits must be kept, which currently apply to start-stop automatic.
  • the operation of a start-stop system is only allowed at temperatures below 60 ° C.
  • the proposed method for controlling the suction valve further allows a quick start of the internal combustion engine, since the rail pressure remains unaffected.
  • any rail pressure can be allowed without violating any limit values. This means that the problem of "start against pressure" is no longer relevant.
  • Fig. 1 is a schematic representation of a high-pressure fuel pump with an electrically controllable suction valve for controlling the flow rate of the high-pressure pump and
  • Fig. 2 is a diagram illustrating a preferred control of a normally open valve open suction valve.
  • the high-pressure pump 2 for a common-rail injection system shown very diagrammatically in FIG. 1 comprises a pump element with a pump piston 5 which is received in a lift-movable manner for limiting a high-pressure element space 4 in a cylinder bore 6 of a housing part 7 of the high-pressure pump 2.
  • an engine 3 which is designed here as a cam engine, the pump piston 5 is driven in a lifting movement.
  • 4 existing fuel is compressed in the high pressure element space and then fed via a high-pressure outlet 9 a high-pressure accumulator (not shown).
  • the filling of the high-pressure element space 4 with fuel takes place via an electrically controllable intake valve 1, which in the present case is designed as a normally open valve.
  • the suction valve 1 has a valve plunger 8 which opens into the high-pressure element chamber 4 of the high-pressure pump 2 and which can be actuated via a magnetic actuator (not shown).
  • a magnetic actuator not shown
  • the magnetic plate must be energized to close the suction valve 1.
  • the energization is indicated by the arrows 10.
  • the closing time of the suction valve 1 determines the delivery rate of the high-pressure pump 2 when the activation takes place in accordance with the representation of FIG.
  • the period of energization falls into the delivery phase of the high-pressure pump 2.
  • the pump piston 5 executes a delivery stroke, that is, it moves from a bottom dead center (UT) moves to a top dead center (TDC) (see dashed line).
  • TDC top dead center
  • the suction valve 1 remains open (see dotted line), so that no pressure in the high pressure element space 4 is able to build up (see dotted line).
  • the pressure buildup occurs only when the suction valve 1 closes. Since it is a normally open valve, the suction valve 1 must be energized for this purpose.
  • the time of energization or the closing time of the suction valve 1 thus determines the flow rate of the high-pressure pump second
  • the closing time is delayed in time in order to allow pressure to build up in the high pressure element space 4 only when it is ensured that sufficient fuel is available for lubricating the engine 3.
  • the time delay can be up to one second, in particular to allow the formation of a hydrodynamic lubricant film between the components of the engine 3.

Abstract

The invention relates to a method for controlling an electrically controllable suction valve (1) for controlling the delivery rate of a high-pressure pump (2) in a fuel injection system, in particular a common-rail injection system, of an internal combustion engine. According to the invention, the suction valve (1) is controlled at least at the start of the internal combustion engine as a function of at least one parameter influencing the lubrication conditions in a power unit chamber (3) of the high-pressure pump (2).

Description

Beschreibung Titel  Description title
Verfahren zur Ansteuerung eines elektrisch ansteuerbaren Saugventils  Method for controlling an electrically controllable suction valve
Die Erfindung betrifft ein Verfahren zur Ansteuerung eines elektrisch ansteuerbaren Saugventils zur Regelung der Fördermenge einer Hochdruckpumpe in einem Kraftstoffeinspritzsystem, insbesondere in einem Common-Rail-Einspritzsystem, einer Brennkraftmaschine. The invention relates to a method for controlling an electrically controllable suction valve for controlling the delivery rate of a high pressure pump in a fuel injection system, in particular in a common rail injection system, an internal combustion engine.
Stand der Technik State of the art
Eine Hochdruckpumpe in einem Kraftstoffeinspritzsystem, insbesondere in einem Common-Rail-Einspritzsystem, dient der Förderung von Kraftstoff auf Hochdruck. Hierzu weist die Hochdruckpumpe mindestens ein Pumpenelement mit einem Hochdruck- Elementraum auf, in dem der Kraftstoff komprimiert wird. Der auf Hochdruck geförderte Kraftstoff wird anschließend über einen Hochdruckabgang einem Hochdruckspeicher, dem so genannten Rail, zugeführt. Über an den Hochdruckspeicher angeschlossene Einspritzventile wird dann der unter hohem Druck stehende Kraftstoff in einen Brennraum der Brennkraftmaschine eingespritzt. A high pressure pump in a fuel injection system, particularly in a common rail injection system, serves to deliver fuel to high pressure. For this purpose, the high-pressure pump has at least one pump element with a high-pressure element space, in which the fuel is compressed. The fuel delivered for high pressure is then fed via a high-pressure outlet to a high-pressure accumulator, the so-called rail. About connected to the high-pressure accumulator injectors then the fuel under high pressure is injected into a combustion chamber of the internal combustion engine.
Die Befüllung eines Hochdruck- Elementraums einer Hochdruckpumpe erfolgt in der Regel über ein Saugventil, das beispielsweise als einfaches Rückschlagventil ausgelegt sein kann. Zur Mengenregelung ist diesem dann eine Zumesseinheit vorgeschaltet, welche die Zumessung einer definierten Kraftstoffmenge ermöglicht. Alternativ kann zur Mengenregelung aber auch ein elektrisch ansteuerbares Saugventil eingesetzt werden, so dass die Zumesseinheit entfallen kann. Das elektrisch ansteuerbare Saugventil kann dabei als stromlos offenes oder als stromlos geschlossenes Ventil ausgebildet sein. In beiden Fällen wirkt üblicherweise ein Magnetsteller auf ein Ventil- glied des Saugventils ein, um dieses entgegen der Federkraft einer Feder zu schließen oder zu öffnen. The filling of a high pressure element space of a high-pressure pump is usually via a suction valve, which may be designed for example as a simple check valve. For volume control this is then preceded by a metering unit, which allows the metering of a defined amount of fuel. Alternatively, however, an electrically controllable suction valve can also be used for flow control, so that the metering unit can be dispensed with. The electrically controllable suction valve can be designed as a normally open or normally closed valve. In both cases, usually a magnetic actuator acts on a valve member of the suction valve to close this against the spring force of a spring or open.
Die Mengenregelung über ein elektrisch ansteuerbares Saugventil erfolgt in der Regel in der Weise, dass das Saugventil während der Saugphase der Hochdruckpumpe geöffnet bleibt, um den Hochdruck- Elementraum der Hochdruckpumpe nahezu vollständig mit Kraftstoff zu füllen. Damit ist noch keine Zumessung einer definierten Kraftstoffmenge erfolgt. Dies geschieht erst in der anschließenden Förderphase, in der das Saugventil solange geöffnet bleibt bis eine überschüssige Menge Kraftstoff aus dem Hochdruck- Elementraum zurück in den Zulaufbereich der Hochdruckpumpe verdrängt wurde. Der Schließzeitpunkt des Saugventils während der Förderphase bestimmt demnach die Fördermenge der Hochdruckpumpe. The flow control via an electrically controllable suction valve is generally carried out in such a way that the suction valve remains open during the suction phase of the high-pressure pump in order to fill the high-pressure element space of the high-pressure pump almost completely with fuel. This is still no metering of a defined amount of fuel. This happens only in the subsequent production phase, in which the suction valve remains open until an excess amount of fuel from the high-pressure element chamber has been displaced back into the inlet region of the high-pressure pump. The closing time of the suction valve during the delivery phase therefore determines the delivery rate of the high-pressure pump.
Zur Förderung von Kraftstoff auf Hochdruck muss das Saugventil geschlossen sein, da ansonsten kein Druck im Hochdruck- Elementraum der Hochdruckpumpe aufgebaut werden kann. Der sich bei geschlossenem Saugventil im Hochdruck- Elementraum aufbauende Druck belastet die Triebwerkskomponenten der Hochdruckpumpe, da diese gegen diesen Druck arbeiten müssen. Die Belastung kann dadurch minimiert werden, dass eine ausreichende Menge Kraftstoff zur Schmierung der Triebwerkskomponenten zur Verfügung gestellt wird. In Abhängigkeit vom jeweiligen Betriebszustand der Brennkraftmaschine, beispielsweise bei kleinen Drehzahlen oder Neustart der Brennkraftmaschine, ist dies jedoch nicht immer möglich, so dass die Schmierbedingungen im Triebwerksraum der Hochdruckpumpe unzureichend sind. Zum gleichen Ergebnis können externe Einflüsse, wie beispielsweise hohe Außentemperaturen, führen. Die Folge ist ein erhöhter Verschleiß an den Triebwerkskomponenten. To promote fuel to high pressure, the suction valve must be closed because otherwise no pressure in the high pressure element space of the high pressure pump can be built. The pressure building up in the high-pressure element chamber when the suction valve is closed loads the engine components of the high-pressure pump, since these must work against this pressure. The load can be minimized by providing a sufficient amount of fuel to lubricate the engine components. Depending on the respective operating state of the internal combustion engine, for example at low speeds or restart of the internal combustion engine, this is not always possible, so that the lubrication conditions in the engine room of the high-pressure pump are insufficient. External influences, such as high outside temperatures, can lead to the same result. The result is increased wear on the engine components.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Ansteuerung eines elektrisch ansteuerbaren Saugventils zur Regelung der Fördermenge einer Hochdruckpumpe anzugeben, das einen positiven Effekt auf die Robustheit der Hochdruckpumpe hat. Insbesondere soll durch das angegebene Verfahren der Verschleiß im Bereich des Triebwerks der Hochdruckpumpe gemindert werden. Zur Lösung der Aufgabe wird das Verfahren mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen. The invention is therefore based on the object to provide a method for controlling an electrically controllable suction valve for controlling the flow rate of a high-pressure pump, which has a positive effect on the robustness of the high-pressure pump. In particular, should be reduced by the specified method of wear in the engine of the high-pressure pump. To solve the problem, the method with the features of claim 1 is proposed. Advantageous developments of the invention can be found in the dependent claims.
Offenbarung der Erfindung Disclosure of the invention
Bei dem vorgeschlagenen erfindungsgemäßen Verfahren zur Ansteuerung eines elektrisch ansteuerbaren Saugventils zur Regelung der Fördermenge einer Hochdruckpumpe in einem Kraftstoffeinspritzsystem, insbesondere in einem Common- Rail- Einspritzsystem, einer Brennkraftmaschine, wird zumindest beim Start der Brennkraftmaschine das Saugventil in Abhängigkeit von mindestens einem Parameter angesteuert, der Einfluss auf die Schmierbedingungen in einem Triebwerksraum der Hochdruckpumpe besitzt. Das heißt, dass der Parameter in einer Beziehung zu den In the proposed method according to the invention for controlling an electrically controllable suction valve for controlling the flow rate of a high-pressure pump in a fuel injection system, in particular in a common rail injection system, an internal combustion engine, at least the start of the internal combustion engine, the suction valve is controlled in dependence on at least one parameter, the Has influence on the lubrication conditions in an engine room of the high-pressure pump. This means that the parameter is related to the
Schmierbedingungen im Triebwerksraum steht und demzufolge eine Bewertung derselben ermöglicht. Das Saugventil kann somit in Abhängigkeit von den tatsächlichen Schmierbedingungen im Triebwerksraum der Hochdruckpumpe angesteuert werden, wobei der Parameter als Trigger für die Ansteuerung des Saugventils dient. Lubricating conditions in the engine room and therefore allows an evaluation of the same. The suction valve can thus be controlled as a function of the actual lubrication conditions in the engine room of the high-pressure pump, wherein the parameter serves as a trigger for the control of the suction valve.
Über eine mit dem Saugventil verbundene Steuereinheit wird das Saugventil bevorzugt derart angesteuert, dass es bei unzureichenden Schmierbedingungen zunächst geöffnet bleibt, um einen Druckaufbau im Hochdruck- Elementraum der Hochdruckpumpe zu verhindern. Steht dann eine ausreichende Menge Kraftstoff zur Schmierung der Triebwerkskomponenten zur Verfügung, was wiederum durch den mindestens einen Parameter angezeigt wird, kann das Saugventil geschlossen werden. Bei einem als stromlos offenes Ventil ausgebildeten Saugventil wird hierzu der Magnetsteller bestromt. Bei einem als stromlos geschlossenes Ventil ausgebildeten Saugventil wird hierzu die Bestromung des Magnetstellers beendet. About a connected to the suction valve control unit, the suction valve is preferably controlled such that it initially remains open in insufficient lubrication conditions to prevent pressure build-up in the high pressure element space of the high-pressure pump. If then a sufficient amount of fuel to lubricate the engine components available, which in turn is indicated by the at least one parameter, the suction valve can be closed. In a suction valve designed as a normally open valve, the magnetic plate is energized for this purpose. In a designed as a normally closed valve suction valve the energization of the magnetic actuator is terminated for this purpose.
Durch das erfindungsgemäße Verfahren ist demnach sichergestellt, dass ein Druckaufbau im Hochdruck- Elementraum der Hochdruckpumpe erst dann erfolgt, wenn die Schmierbedingungen im Bereich des Triebwerks der Hochdruckpumpe als ausreichend zu bewerten sind. Dies ist insbesondere der Fall, wenn eine zur Ausbildung eines hydrodynamischen Schmierfilms ausreichende Menge Kraftstoff im Triebwerksraum vorhanden ist. Ein hydrodynamischer Schmierfilm dient der Verringerung der Reibung im Kontaktbereich zweier Triebwerkskomponenten, wie beispielsweise zwischen einer Rolle und einem Rollenschuh eines Nocken- oder Exzentertriebwerks der Hochdruckpumpe. Die Belastung der Triebwerkskomponenten sowie der Verschließ an diesen Triebwerkskomponenten wird auf diese Weise deutlich gemindert, so dass die Robustheit der Hochdruckpumpe steigt. The inventive method is therefore ensured that a pressure build-up in the high-pressure element space of the high-pressure pump takes place only when the lubrication conditions in the region of the engine of the high-pressure pump are to be considered sufficient. This is the case, in particular, when there is sufficient fuel in the engine room to form a hydrodynamic lubricant film. A hydrodynamic lubricating film serves to reduce friction in the Contact area of two engine components, such as between a roller and a roller shoe of a cam or Exzentertriebwerks the high pressure pump. The load on the engine components and the closure of these engine components is significantly reduced in this way, so that the robustness of the high-pressure pump increases.
Wie bereits erwähnt, wird der Parameter bei der Ansteuerung des elektrisch ansteuerbaren Saugventils bevorzugt als Trigger verwendet. Dies setzt voraus, dass der Parameter Rückschlüsse auf die Schmierbedingungen im Triebwerksraum der Hochdruckpumpe zulässt. Als Parameter kann daher insbesondere eine den Betriebszustand der Brennkraftmaschine beschreibende Kenngröße, wie beispielsweise die Drehzahl, die Betriebsdauer oder dergleichen, verwendet werden. Alternativ oder ergänzend kann eine Kenngröße verwendet werden, welche die Bedingungen im Triebwerksraum beschreibt, wie beispielsweise die Kraftstofftemperatur, der Kraftstoffdruck oder dergleichen. Eine entsprechende Sensorik zur Erfassung der Kenngrößen ist in der Regel bereits vorhanden, so dass hierauf zurückgegriffen werden kann. Sofern externe Einflüsse, wie beispielsweise die Außentemperatur, bei der Ansteuerung des Saugventils Berücksichtigung finden sollen, gilt es diese ebenfalls mittels einer entsprechenden Sensorik zu erfassen. As already mentioned, the parameter is preferably used as a trigger in the control of the electrically controllable suction valve. This assumes that the parameter permits conclusions about the lubrication conditions in the engine room of the high-pressure pump. Therefore, a parameter describing the operating state of the internal combustion engine, such as, for example, the rotational speed, the operating time or the like, can be used as the parameter. Alternatively or additionally, a parameter may be used which describes the conditions in the engine room, such as the fuel temperature, the fuel pressure or the like. A corresponding sensor for detecting the characteristics is usually already available, so that it can be used. If external influences, such as the outside temperature, should be taken into account in the control of the suction valve, it is also necessary to detect these by means of a corresponding sensor.
Um sicherzustellen, dass ein Druckaufbau im Hochdruck- Elementraum der Hochdruckpumpe nur dann erfolgt, wenn die Schmierbedingungen im Triebwerksraum ausreichend sind, wird ferner vorgeschlagen, dass beim Start der Brennkraftmaschine das Schließen des Saugventils zeitlich verzögert wird. Dies hat zur Folge, dass auch der Druckaufbau im Hochdruck- Elementraum der Hochdruckpumpe zeitlich verzögert wird. Während dieser Zeitspanne kann sich der Triebwerksraum der Hochdruckpumpe mit Kraftstoff füllen, so dass beim Start der Brennkraftmaschine ausreichende Schmierbedingungen vorliegen. Vorzugsweise beträgt die zeitliche Verzögerung 0,1 bis 1 Sekunde. Diese Zeitspanne hat sich im Rahmen von Versuchen als ausreichend erwiesen, um günstige Schmierbedingungen herzustellen. To ensure that a pressure build-up in the high-pressure element space of the high-pressure pump takes place only when the lubrication conditions in the engine room are sufficient, it is further proposed that the start of the internal combustion engine, the closing of the suction valve is delayed in time. This has the consequence that the pressure build-up in the high pressure element space of the high pressure pump is delayed in time. During this period, the engine room of the high-pressure pump can fill with fuel, so that there are sufficient lubricating conditions at the start of the internal combustion engine. Preferably, the time delay is 0.1 to 1 second. This period of time has proven to be sufficient in the context of experiments to produce favorable lubrication conditions.
In Weiterbildung der Erfindung wird vorgeschlagen, dass beim Stopp der Brennkraftmaschine das Saugventil geöffnet wird, so dass Druck im Hochdruck- Elementraum der Hochdruckpumpe abgebaut wird. Der Druckabbau im Hochdruck- Elementraum der Hochdruckpumpe hat keine Auswirkungen auf den Druck im angeschlossenen Rail, da der Hochdruckabgang in der Regel durch ein Rückschlagventil realisiert wird, so dass sichergestellt ist, dass ein ausreichend hoher Raildruck beim erneuten Start der Brennkraftmaschine zur Verfügung steht. Der Druckabbau im Hochdruck- Elementraum der Hochdruckpumpe dient vorrangig der Verringerung der Belastung der Triebwerkskomponenten. Denn wird das Saugventil beim Stopp der Brennkraftmaschine geöffnet, wird Kraftstoff aus dem Hochdruck- Elementraum zurück in den Zulaufbereich der Hochdruckpumpe geschoben, bis sich ein weitgehender Druckausgleich einstellt. Da im Zulaufbereich Niederdruck herrscht, sinkt der Druck im Hochdruck- Elementraum. In a further development of the invention, it is proposed that when the internal combustion engine stops, the suction valve is opened so that pressure in the high-pressure element chamber of the high-pressure pump is reduced. The pressure reduction in the high pressure element space of High-pressure pump has no effect on the pressure in the connected rail, since the high pressure outlet is usually realized by a check valve, so that it is ensured that a sufficiently high rail pressure when restarting the internal combustion engine is available. The pressure reduction in the high-pressure element space of the high-pressure pump serves primarily to reduce the load on the engine components. Because the suction valve is opened when stopping the engine, fuel from the high-pressure element space is pushed back into the inlet region of the high-pressure pump until a large pressure equalization occurs. Since there is low pressure in the inlet area, the pressure in the high-pressure element space drops.
Gemäß einer ersten bevorzugten Ausführungsform der Erfindung wird ein als stromlos offenes Ventil ausgebildetes Saugventil verwendet. Die Ansteuerung des Saugventils erfolgt in der Weise, dass ein Ansteuerstrom immer dann angelegt wird, wenn das Saugventil geschlossen werden soll. Über die Ansteuerung ist demnach der Schließzeitpunkt des Saugventils festlegbar. According to a first preferred embodiment of the invention, a suction valve designed as a normally open valve is used. The control of the suction valve is carried out in such a way that a drive current is always applied when the suction valve is to be closed. Accordingly, the closing time of the suction valve can be determined via the control.
Alternativ wird vorgeschlagen, dass ein als stromlos geschlossenes Ventil ausgebildetes Saugventil bei der Durchführung des erfindungsgemäßen Verfahrens verwendet wird. Um das Saugventil zu schließen, muss der Ansteuerstrom weggenommen werden. Hierüber ist dann wiederum der Schließzeitpunkt des Saugventils festlegbar. Alternatively, it is proposed that a suction valve designed as a normally closed valve is used in carrying out the method according to the invention. To close the suction valve, the drive current must be removed. This in turn then the closing time of the suction valve can be fixed.
Unabhängig davon, ob ein als stromlos offenes oder als stromlos geschlossenes Ventil ausgebildetes Saugventil verwendet wird, ermöglicht das erfindungsgemäße Verfahren einen weitgehend verschleißarmen Betrieb der Hochdruckpumpe. Die Robustheit der Hochdruckpumpe wird somit gesteigert. Das Verfahren eignet sich daher insbesondere für Kraftstoffeinspritzsysteme, die für kraftstoffkritische Märkte gedacht sind. Regardless of whether a designed as normally open or normally closed valve suction valve is used, the inventive method allows a low-wear operation of the high-pressure pump. The robustness of the high-pressure pump is thus increased. The method is therefore particularly suitable for fuel injection systems intended for fuel-critical markets.
Ferner kann bei Brennkraftmaschinen, die eine Start- Stopp Automatik aufweisen, der Startdruck, der derzeit bei Common-Rail-Hochdruckpumpen auf 300 bar beschränkt ist, frei appliziert werden. Ein positiver Nebeneffekt ist, dass auch keine Temperaturbegrenzungen mehr eingehalten werden müssen, die derzeit für Start- Stopp Automatiken gelten. Derzeit gilt, dass der Betrieb einer Start- Stopp Automatik nur bei Temperaturen von weniger als 60°C erlaubt ist. Das vorgeschlagene Verfahren zur Ansteuerung des Saugventils ermöglicht weiterhin einen schnellen Start der Brennkraftmaschine, da der Raildruck unbeeinflusst bleibt. Zudem kann ein beliebiger Railstanddruck erlaubt werden, ohne etwaige Grenzwerte zu verletzen. Das heißt, dass die Problematik„Start gegen Druck" nicht mehr relevant ist. Furthermore, in internal combustion engines which have a start-stop automatic, the starting pressure, which is currently limited to 300 bar in common-rail high-pressure pumps, can be applied freely. A positive side effect is that no more temperature limits must be kept, which currently apply to start-stop automatic. Currently, the operation of a start-stop system is only allowed at temperatures below 60 ° C. The proposed method for controlling the suction valve further allows a quick start of the internal combustion engine, since the rail pressure remains unaffected. In addition, any rail pressure can be allowed without violating any limit values. This means that the problem of "start against pressure" is no longer relevant.
Die Erfindung wird nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen: The invention will be explained in more detail with reference to the accompanying drawings. These show:
Fig. 1 eine schematische Darstellung einer Kraftstoffhochdruckpumpe mit einem elektrisch ansteuerbaren Saugventil zur Regelung der Fördermenge der Hochdruckpumpe und Fig. 1 is a schematic representation of a high-pressure fuel pump with an electrically controllable suction valve for controlling the flow rate of the high-pressure pump and
Fig. 2 ein Diagramm zur Darstellung einer bevorzugten Ansteuerung eines als stromlos offenes Ventil ausgebildeten Saugventils. Fig. 2 is a diagram illustrating a preferred control of a normally open valve open suction valve.
Ausführliche Beschreibung der Zeichnungen Detailed description of the drawings
Die in der Figur 1 sehr schematisch dargestellte Hochdruckpumpe 2 für ein Common- Rail- Einspritzsystem umfasst ein Pumpenelement mit einem Pumpenkolben 5, der zur Begrenzung eines Hochdruck- Elementraums 4 in einer Zylinderbohrung 6 eines Gehäuseteils 7 der Hochdruckpumpe 2 hubbeweglich aufgenommen ist. Über ein Triebwerk 3, das vorliegend als Nockentriebwerk ausgebildet ist, ist der Pumpenkolben 5 in einer Hubbewegung antreibbar. Im Förderhub des Pumpenkolbens, während dessen sich das Volumen im Hochdruck- Elementraum 4 verkleinert, wird im Hochdruck-Elementraum 4 vorhandener Kraftstoff komprimiert und anschließend über einen Hochdruckabgang 9 einem Hochdruckspeicher (nicht dargestellt) zugeführt. Die Befüllung des Hochdruck- Elementraums 4 mit Kraftstoff erfolgt über ein elektrisch ansteuerbares Saugventil 1, das vorliegend als stromlos offenes Ventil ausgebildet ist. Das Saugventil 1 besitzt einen in den Hochdruck- Elementraum 4 der Hochdruckpumpe 2 öffnenden Ventilstößel 8, der über einen Magnetsteller (nicht dargestellt) betätigbar ist. Als stromlos offenes Ventil muss der Magnetsteller bestromt werden, um das Saugventil 1 zu schließen. In der Fig. 1 ist die Bestromung mittels der Pfeile 10 angedeutet. Der Schließzeitpunkt des Saugventils 1 bestimmt die Fördermenge der Hochdruckpumpe 2, wenn die Ansteuerung entsprechend der Darstellung der Fig. 2 erfolgt. The high-pressure pump 2 for a common-rail injection system shown very diagrammatically in FIG. 1 comprises a pump element with a pump piston 5 which is received in a lift-movable manner for limiting a high-pressure element space 4 in a cylinder bore 6 of a housing part 7 of the high-pressure pump 2. About an engine 3, which is designed here as a cam engine, the pump piston 5 is driven in a lifting movement. In the delivery stroke of the pump piston, during which the volume in the high-pressure element space 4 decreases, 4 existing fuel is compressed in the high pressure element space and then fed via a high-pressure outlet 9 a high-pressure accumulator (not shown). The filling of the high-pressure element space 4 with fuel takes place via an electrically controllable intake valve 1, which in the present case is designed as a normally open valve. The suction valve 1 has a valve plunger 8 which opens into the high-pressure element chamber 4 of the high-pressure pump 2 and which can be actuated via a magnetic actuator (not shown). As normally open valve, the magnetic plate must be energized to close the suction valve 1. In Fig. 1, the energization is indicated by the arrows 10. The closing time of the suction valve 1 determines the delivery rate of the high-pressure pump 2 when the activation takes place in accordance with the representation of FIG.
Wie der Fig. 2 zu entnehmen ist, fällt der Zeitraum der Bestromung (durchgezogene Linie) in die Förderphase der Hochruckpumpe 2. Denn während der Bestromung des Saugventils 1 führt der Pumpenkolben 5 einen Förderhub aus, das heißt, dass er sich von einem unteren Totpunkt (UT) zu einem oberen Totpunkt (OT) bewegt (siehe gestrichelte Linie). Zu Beginn des Förderhubs des Pumpenkolbens 5 bleibt das Saugventil 1 geöffnet (siehe strichpunktierte Linie), so dass sich kein Druck im Hochdruck- Elementraum 4 aufzubauen vermag (siehe punktierte Linie). Der Druckaufbau erfolgt erst, wenn das Saugventil 1 schließt. Da es sich um ein stromlos offenes Ventil handelt, muss hierzu das Saugventil 1 bestromt werden. Der Zeitpunkt der Bestromung bzw. der Schließzeitpunkt des Saugventils 1 bestimmt demnach die Fördermenge der Hochdruckpumpe 2. As can be seen from FIG. 2, the period of energization (solid line) falls into the delivery phase of the high-pressure pump 2. During the energization of the intake valve 1, the pump piston 5 executes a delivery stroke, that is, it moves from a bottom dead center (UT) moves to a top dead center (TDC) (see dashed line). At the beginning of the delivery stroke of the pump piston 5, the suction valve 1 remains open (see dotted line), so that no pressure in the high pressure element space 4 is able to build up (see dotted line). The pressure buildup occurs only when the suction valve 1 closes. Since it is a normally open valve, the suction valve 1 must be energized for this purpose. The time of energization or the closing time of the suction valve 1 thus determines the flow rate of the high-pressure pump second
Dies macht sich das vorgeschlagene erfindungsgemäße Verfahren zunutze, indem der Schließzeitpunkt zeitlich verzögert wird, um einen Druckaufbau im Hochdruck- Elementraum 4 erst dann zu gestatten, wenn sichergestellt ist, dass ausreichend Kraftstoff zur Schmierung des Triebwerks 3 zur Verfügung steht. Die zeitliche Verzögerung kann bis zu einer Sekunde betragen, um insbesondere die Ausbildung eines hydrodynamischen Schmierfilms zwischen den Komponenten des Triebwerks 3 zu ermöglichen. This makes use of the proposed method according to the invention, in that the closing time is delayed in time in order to allow pressure to build up in the high pressure element space 4 only when it is ensured that sufficient fuel is available for lubricating the engine 3. The time delay can be up to one second, in particular to allow the formation of a hydrodynamic lubricant film between the components of the engine 3.

Claims

Ansprüche claims
1. Verfahren zur Ansteuerung eines elektrisch ansteuerbaren Saugventils (1) zur Regelung der Fördermenge einer Hochdruckpumpe (2) in einem Kraftstoffeinspritzsystem, insbesondere in einem Common-Rail-Einspritzsystem, einer Brennkraftmaschine, dadurch gekennzeichnet, dass zumindest beim Start der Brennkraftmaschine das1. A method for controlling an electrically controllable suction valve (1) for controlling the flow rate of a high-pressure pump (2) in a fuel injection system, in particular in a common rail injection system, an internal combustion engine, characterized in that at least at the start of the internal combustion engine
Saugventil (1) in Abhängigkeit von mindestens einem die Schmierbedingungen in einem Triebwerksraum (3) der Hochdruckpumpe (2) beeinflussenden Parameter angesteuert wird. Suction valve (1) in response to at least one of the lubrication conditions in an engine room (3) of the high pressure pump (2) influencing parameters is controlled.
2. Verfahren nach Anspruch 1, 2. The method according to claim 1,
dadurch gekennzeichnet, dass der Parameter bei der Ansteuerung des elektrisch ansteuerbaren Saugventils (1) als Trigger verwendet wird, wobei vorzugsweise eine den Betriebszustand der Brennkraftmaschine beschreibende Kenngröße, wie beispielsweise die Drehzahl, die Betriebsdauer oder dergleichen, und/oder eine die Be- dingungen im Triebwerksraum (3) beschreibende Kenngröße, wie beispielsweise diecharacterized in that the parameter in the control of the electrically controllable suction valve (1) is used as a trigger, wherein preferably a the operating state of the internal combustion engine descriptive characteristic, such as the speed, the operating time or the like, and / or one of the conditions in Engine room (3) descriptive characteristic, such as the
Kraftstofftemperatur, der Kraftstoffdruck oder dergleichen, als Parameter verwendet werden. Fuel temperature, the fuel pressure or the like, are used as parameters.
3. Verfahren nach Anspruch 1 oder 2, 3. The method according to claim 1 or 2,
dadurch gekennzeichnet, dass beim Start der Brennkraftmaschine das Schließen descharacterized in that at the start of the internal combustion engine closing the
Saugventils (1) und damit der Druckaufbau in einem Hochdruck- Elementraum (4) der Hochdruckpumpe (2) zeitlich verzögert wird, wobei vorzugsweise die zeitliche Verzögerung 0,1 bis 1 Sekunde beträgt. Suction valve (1) and thus the pressure build-up in a high pressure element space (4) of the high-pressure pump (2) is delayed in time, wherein preferably the time delay is 0.1 to 1 second.
4. Verfahren nach einem der vorhergehenden Ansprüche, 4. The method according to any one of the preceding claims,
dadurch gekennzeichnet, dass beim Stopp der Brennkraftmaschine das Saugventil (1) geöffnet wird, so dass Druck im Hochdruck- Elementraum (4) der Hochdruckpumpe (2) abgebaut wird. characterized in that at the stop of the internal combustion engine, the suction valve (1) is opened, so that pressure in the high pressure element space (4) of the high-pressure pump (2) is reduced.
5. Verfahren nach einem der vorhergehenden Ansprüche, 5. Method according to one of the preceding claims,
dadurch gekennzeichnet, dass ein stromlos offenes Ventil als Saugventil (1) verwendet wird. characterized in that a normally open valve is used as a suction valve (1).
6. Verfahren nach einem der Ansprüche 1 bis 4, 6. The method according to any one of claims 1 to 4,
dadurch gekennzeichnet, dass ein stromlos geschlossenes Ventil als Saugventil (1) verwendet wird. characterized in that a normally closed valve is used as a suction valve (1).
PCT/EP2015/073560 2014-10-24 2015-10-12 Method for controlling an electrically controllable suction valve WO2016062570A1 (en)

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