EP1537335B1 - Device for adjusting the pumping capacity of a lubricant pump for an internal combustion engine - Google Patents

Device for adjusting the pumping capacity of a lubricant pump for an internal combustion engine Download PDF

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Publication number
EP1537335B1
EP1537335B1 EP20030740393 EP03740393A EP1537335B1 EP 1537335 B1 EP1537335 B1 EP 1537335B1 EP 20030740393 EP20030740393 EP 20030740393 EP 03740393 A EP03740393 A EP 03740393A EP 1537335 B1 EP1537335 B1 EP 1537335B1
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EP
European Patent Office
Prior art keywords
oil
pressure
piston
vane
engine
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EP20030740393
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German (de)
French (fr)
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EP1537335A1 (en
Inventor
Peter Scholl
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Dr Ing hc F Porsche AG
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Dr Ing hc F Porsche AG
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Priority to DE2002139364 priority Critical patent/DE10239364A1/en
Priority to DE10239364 priority
Application filed by Dr Ing hc F Porsche AG filed Critical Dr Ing hc F Porsche AG
Priority to PCT/EP2003/006971 priority patent/WO2004020831A1/en
Publication of EP1537335A1 publication Critical patent/EP1537335A1/en
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Publication of EP1537335B1 publication Critical patent/EP1537335B1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • F04C14/226Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam by pivoting the cam around an eccentric axis
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00Pressure lubrication
    • F01M1/16Controlling lubricant pressure or quantity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/30Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F04C2/3442Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00Pressure lubrication
    • F01M1/02Pressure lubrication using lubricating pumps
    • F01M2001/0207Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0238Rotary pumps

Description

  • Die Erfindung betrifft eine Einrichtung zur Regelung der Pumpleistung einer Schmiermittelpumpe für eine Brennkraftmaschine nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for regulating the pumping capacity of a lubricant pump for an internal combustion engine according to the preamble of patent claim 1.
  • Es ist allgemein bekannt, bei Verbrennungsmotoren zur Versorgung des Ölkreislaufs starr angetriebene Ölpumpen, die beispielsweise als Außen- oder Innenzahnradpumpen oder als Flügelzellenpumpen ausgebildet sind, einzusetzen. Dabei handelt es sich um Ölpumpen mit variablem oder konstantem Fördervolumen pro Pumpenradumdrehung. Sog. Konstantförderpumpen sind mit einem Druckbegrenzungsventil ausgestattet, mit deren Hilfe der maximale Öldruck eingestellt werden kann. Öffnet das Öldruckbegrenzungsventil bei einem vorab eingestellten Maximalöldruck, so wird das überschüssige Ölvolumen in den Niederdruckteil der Ölpumpe zurückgeführt.It is generally known in internal combustion engines to supply the oil circuit rigidly driven oil pumps, which are designed for example as external or internal gear pumps or vane pumps use. These are oil pumps with variable or constant delivery volume per impeller revolution. So-called. Constant feed pumps are equipped with a pressure relief valve, with the help of which the maximum oil pressure can be adjusted. If the oil pressure relief valve opens at a preset maximum oil pressure, the excess oil volume is returned to the low pressure part of the oil pump.
  • Da der für die Schmierung des Motors erforderliche Ölvolumenstrom nicht immer proportional zur Drehzahl des Motors bzw. zur Drehzahl der Pumpe ist, gibt es Vorschläge, den Öldruck zu regeln, um insbesondere im Teillastbereich die Antriebsleistung der Motorölpumpe reduzieren zu können. So ist beispielsweise aus der JP - OS 9 - 885 33 eine Vorrichtung zur Regelung des Öldrucks einer Zahnradpumpe bekannt, bei der ein vom Druckregelventil überwachter Bypass der Zahnradpumpe druckabhängig geöffnet bzw. geschlossen werden kann. Dazu ist der Kolbenboden mit einer Öffnung bzw. Drossel versehen, die mit einem auf der Rückseite des Kolbenventils ausgebildeten Innenraum in Verbindung steht. Dem Innenraum des Kolbenventils ist ein Steuerventil vorgeschaltet, mit dessen Hilfe der zwischen Vorder- und Rückseite des Kolbenventils herrschende Differenzdruck verändert und damit der Öffnungs - Öldruck eingestellt werden kann.Since the required for the lubrication of the engine oil flow is not always proportional to the speed of the motor or the speed of the pump, there are proposals to regulate the oil pressure in order to reduce the drive power of the engine oil pump especially in the partial load range. For example, from the JP - OS 9 - 885 33 a device for controlling the oil pressure of a gear pump known in which a monitored by the pressure control valve bypass the gear pump can be opened or closed depending on the pressure. For this purpose, the piston head is provided with an opening or throttle, which is in communication with an interior formed on the back of the piston valve. The interior of the piston valve is preceded by a control valve, by means of which the pressure prevailing between the front and rear of the piston valve differential pressure changed and thus the opening - oil pressure can be adjusted.
  • Aus der EP 1 043 504 A2 ist eine Flügelzellenpumpe bekannt, bei der ein Hubring in einem Gehäuse schiebbar oder einseitig in einer ortsfesten Lagerstelle schwenkbar gelagert ist, wobei zur Einstellung einer bestimmten Exzentrizität der Lage des Hubringes eine schieb- und/oder drehbare Kurve vorgesehen ist, die mittels eines von einem Druckregelkreis angesteuerten Stellgliedes verlagerbar ist.From the EP 1 043 504 A2 a vane pump is known in which a cam ring is slidably mounted in a housing or on one side pivotally in a fixed bearing, wherein for adjusting a certain eccentricity of the position of the cam ring a sliding and / or rotatable curve is provided by means of a pressure control loop actuated actuator is displaced.
  • Aus der DE 43 02 610 A1 ist eine Flügelzellenpumpe mit variablem Fördervolumen bekannt, bei der durch eine Veränderung der Lage des Hubringes zur Rotordrehachse der Volumenstrom eingestellt werden kann. Darüber hinaus wird neben der reinen Maximalöldruckbegrenzung bzw. der Fördervolumenregelung eine zusätzliche Begrenzung des Fördervolumens in Abhängigkeit von der Temperatur und/oder der Drehzahl des Motors vorgeschlagen. Dazu sind aufwendige temperaturabhängige Stellglieder sowie zusätzliche Druckregelsysteme erforderlich, die neben der Maximalöldruckbegrenzung eine Verstellung des Hubringes der Flügelzellenpumpe und damit ggf. eine Reduzierung des geförderten Ölvolumenstromes bewirken.From the DE 43 02 610 A1 is a variable displacement vane pump known, in which by adjusting the position of the cam ring to the rotor axis of rotation of the flow rate can be adjusted. In addition, an additional limitation of the delivery volume as a function of the temperature and / or the speed of the engine is proposed in addition to the pure maximum oil pressure limitation or the delivery volume control. For this purpose, complex temperature-dependent actuators and additional pressure control systems are required, which cause an adjustment of the stroke ring of the vane pump and thus possibly a reduction of the funded oil volume flow in addition to the maximum oil pressure limitation.
  • Es ist daher Aufgabe der Erfindung, für eine volumenstromgeregelte Flügelzellenpumpe eine Vorrichtung zu schaffen, mit der auf einfache Art und Weise ein bedarfsgerechte Schmierölversorgung der Brennkraftmaschine erfolgt, so dass die aufgenommene Leistung der Ölpumpe durch eine Absenkung des Öldrucks in bestimmten Betriebszuständen reduzierbar ist.It is therefore an object of the invention to provide for a volume flow controlled vane pump, a device with a simple way a needs-based lubricating oil supply of the engine takes place, so that the absorbed power of the oil pump can be reduced by lowering the oil pressure in certain operating conditions.
  • Die Lösung der Aufgabe erfolgt durch die im Anspruch 1 angegebenen Merkmale.The solution of the problem is achieved by the features specified in claim 1.
  • Mit der vorgeschlagenen Einrichtung kann auf einfache Art und Weise bei einer Flügelzellenpumpe die zur Schmierölversorgung der Brennkraftmaschine erforderliche Antriebsleistung in Abhängigkeit von Betriebsparametern der Brennkraftmaschine gesteuert werden. Damit können die für die verschiedenen Betriebszustände des Motors erforderlichen Öldrücke eingestellt bzw. angepasst werden, so dass aufgrund der reduzierten Aufnahmeleistung gegenüber einer ungeregelten Ölpumpe ein weiteres Kraftstoffeinsparpotential vorhanden ist. Die vorgeschlagene Einrichtung zur Reduzierung des Öldrucks ist auf einfache Art und Weise bei bereits in Betrieb befindlichen Flügelzellenpumpen nachrüstbar.With the proposed device, the drive power required for supplying the lubricating oil to the internal combustion engine can be controlled in a simple manner in a vane-cell pump as a function of operating parameters of the internal combustion engine. Thus, the required for the various operating conditions of the engine oil pressures can be adjusted or adjusted, so that due to the reduced power consumption over an unregulated oil pump, a further fuel economy potential is available. The proposed device for reducing the oil pressure can be retrofitted in a simple manner with vane pumps already in operation.
  • Durch die in den Unteransprüchen angegebenen Merkmale sind weitere vorteilhafte Ausgestaltungen und Verbesserungen der erfindungsgemäßen Regelung der Pumpleistung einer Schmiermittelpumpe möglich.The features specified in the dependent claims further advantageous embodiments and improvements of the invention control of the pump power of a lubricant pump are possible.
  • Die auf der Kolbenrückseite des Druckregelventils dem Motoröldruck entgegen gerichtete Kraft wird durch eine Spiralfeder erzeugt, die in einer auf der Rückseite des Kolbens vorgesehenen Aufnahmeöffnung geführt und abgestützt ist.The force directed against the engine oil pressure on the piston rear side of the pressure regulating valve is generated by a helical spring, which is guided and supported in a receiving opening provided on the rear side of the piston.
  • Zur druckabhängigen Steuerung des Ölvolumenstroms ist in einer vom Regelventil zum Tank führenden Hydraulikleitung ein Ventilelement integriert, über das der zur Saugseite der Ölpumpe zurückführbare Ölstrom einstellbar ist.For pressure-dependent control of the oil volume flow, a valve element is integrated in a hydraulic line leading from the control valve to the tank, via which the oil flow which can be returned to the suction side of the oil pump is adjustable.
  • Der Öldruck bzw. der von der Ölpumpe geförderte Ölvolumenstrom wird in Abhängigkeit von Betriebsparametern der Brennkraftmaschine, wie Drehzahl, Last oder Motoröltemperatur gesteuert.The oil pressure or the oil volume flow delivered by the oil pump is controlled as a function of operating parameters of the internal combustion engine, such as rotational speed, load or engine oil temperature.
  • Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend näher erläutert.An embodiment of the invention is illustrated in the drawing and will be explained in more detail below.
  • Es zeigen:
  • Fig. 1
    eine schematischen Gesamtansicht einer Einrichtung zur Regelung der Pumpleistung einer Flügelzellenpumpe in einer ersten Betriebsstellung,
    Fig. 2
    die Einrichtung in einer zweiten Betriebsstellung,
    Fig. 3
    eine graphische Darstellung einer betriebspunktabhängigen Öldrucksteuerung und
    Fig. 4
    ein Blockschaltbild für eine kalibrierte Öldrucksteuerung.
    Show it:
    Fig. 1
    3 shows a schematic overall view of a device for regulating the pumping capacity of a vane pump in a first operating position,
    Fig. 2
    the device in a second operating position,
    Fig. 3
    a graphical representation of an operating point-dependent oil pressure control and
    Fig. 4
    a block diagram for a calibrated oil pressure control.
  • Beschreibung des AusführungsbeispielsDescription of the embodiment
  • Die in Fig. 1 und 2 schematisch dargestellte Flügelzellenpumpe 2 weist einen Rotor 4 auf, der drehfest mit einer Antriebswelle 6 verbunden ist. Im Rotor 4 sind radial nach außen verlaufende Ausnehmungen 8 vorgesehen, in denen auf bekannte Art und Weise längsverschiebbare Rotorflügel 10 aufgenommen sind. Rotor 4 und die darin aufgenommenen Rotorflügel 10 sind von einem Hubring 12 umschlossen, so dass zwischen Rotor 4, Hubring 12 und zwischen zwei jeweils benachbarten Rotorflügeln 10 entsprechende Ölförderräume 14 ausgebildet sind. Der Hubring 12 ist an einem gehäusefesten Punkt um eine Achse 16 schwenkbar gelagert; damit ist seine Lage bezüglich der Rotordrehachse zur Einstellung einer bestimmten Ölfördermenge pro Umdrehung veränderbar. Dazu weist der Hubring 12 eine der Lagerachse 16 gegenüberliegende eine Anlenkzunge 18 auf, die mit einem Führungszapfen 20 versehen ist, der nach Art einer Kulissenführung mit einem Kulissenfenster 22 einer Stellstange 24 zusammenwirkt. Die Stellstange 24 ist am Außenumfang eines in einem Druckregelventil 26 geführten Stellkolbens 28 angebunden.In the Fig. 1 and 2 Vane pump 2 shown schematically has a rotor 4 which is rotatably connected to a drive shaft 6. In the rotor 4 radially outwardly extending recesses 8 are provided, in which in a known manner longitudinally displaceable rotor blades 10 are added. Rotor 4 and the rotor blades 10 received therein are enclosed by a cam ring 12, so that corresponding oil delivery chambers 14 are formed between rotor 4, cam ring 12 and between two adjacent rotor blades 10. The cam ring 12 is pivotally mounted on a housing-fixed point about an axis 16; so that its position relative to the rotor axis for adjusting a certain oil flow per revolution is variable. For this purpose, the cam ring 12 has a bearing axis 16 opposite a coupling tongue 18 which is provided with a guide pin 20 which cooperates with a gate window 22 of an actuating rod 24 in the manner of a slotted guide. The control rod 24 is connected to the outer circumference of a guided in a pressure control valve 26 actuating piston 28.
  • Zwischen dem Gehäuse 32 und der Kolben - Vorderseite 34 ist ein erster Druckraum 36 ausgebildet, der mit der Druckseite der Flügelzellenpumpe 2 in Verbindung steht. Auf der Kolbenrückseite 37 ist im Stellkolben 28 eine Aufnahmeöffnung 38 vorgesehen, in der eine Spiralfeder 40 aufgenommen bzw. geführt ist. Die Spiralfeder 40 stützt sich an ihrem einen Ende am Boden der Kolbenrückseite 37 und an ihrem anderen Ende an einem Verschlusselement 42 des Druckregelventils 26 ab. Zwischen Verschlusselement 42 und Kolbenrückseite ist ein zweiter Druckraum 44 ausgebildet, der über eine im Verschlusselement 42 vorgesehene Öffnung 46 und eine daran angeschlossene Hydraulikleitung 48 mit dem Eingang 50 eines Regelventils 52 verbunden ist. Der Eingang 50 des Regelventils 52 wird von einem Stellkolben 54 überwacht, der von einem am Regelventil 52 vorgesehenen Elektromagneten 56 gesteuert ist. Der Ausgang 58 des Regelventils 52 ist mit dem Öltank bzw. dem Ölvorratsbehälter 60 der Brennkraftmaschine verbunden, in den wiederum die Saugseite der Flügelzellenpumpe 2 einmündet. Die beiden im Druckregelventil 26 ausgebildeten Druckräume 36 und 44 stehen über eine im Stellkolben 28 ausgebildete Drossel, die im vorliegenden Ausführungsbeispiel als Stufenbohrung 62 ausgebildet ist, in Verbindung.Between the housing 32 and the piston - front side 34, a first pressure chamber 36 is formed, which is in communication with the pressure side of the vane pump 2. On the piston rear side 37, a receiving opening 38 is provided in the adjusting piston 28, in which a coil spring 40 is received or guided. The coil spring 40 is supported at its one end on the bottom of the piston rear side 37 and at its other end on a closure element 42 of the pressure regulating valve 26 from. Between the closure element 42 and the piston rear side, a second pressure chamber 44 is formed, which is connected via an opening 46 provided in the closure element 42 and a hydraulic line 48 connected thereto to the inlet 50 of a control valve 52. The input 50 of the control valve 52 is monitored by a control piston 54, which is controlled by an opening provided on the control valve 52 electromagnet 56. The output 58 of the control valve 52 is connected to the oil tank or the oil reservoir 60 of the internal combustion engine, in turn, the suction side of the vane pump. 2 opens. The two formed in the pressure control valve 26 pressure chambers 36 and 44 are connected via a formed in the actuator piston 28 throttle, which is formed in the present embodiment as a stepped bore 62, in conjunction.
  • Im nachfolgenden wird die Funktionsweise der Einrichtung zur Regelung der Pumpleistung der Flügelzellenpumpe näher erläutert. Die vom Motor der Brennkraftmaschine starr angetriebene Flügelzellenpumpe fördert in Abhängigkeit von Betriebsparametern, die anhand des Steuerdiagramms in Fig. 3 noch näher erläutert werden, einen bestimmten Ölvolumenstrom zu den Verbrauchern der Brennkraftmaschine. Dabei ist der Druckraum 36 des Druckregelventils 26 mit der Druckseite der Flügelzellenpumpe 2 verbunden. In Abhängigkeit von dem im ersten Druckraum 36 herrschenden Öldruck wird die Lage des Hubringes 12 bezogen auf die Rotordrehachse und damit die Ölfördermenge pro Rotorumdrehung eingestellt. Damit kann, wie allgemein bekannt ist, der von der Flügelzellenpumpe 2 geförderte Ölvolumenstrom zwischen einer Maximalfördermenge (siehe Fig. 1) und einer Nullfördermenge (siehe Fig. 2) stufenlos eingestellt werden. Durch die nachfolgend näher erläuterte Ansteuerung des Druckregelventils 26 können, wie bereits eingangs erläutert, zur weiteren Reduzierung der aufgenommenen Antriebsleistung der Flügelzellenpumpe 2 in Abhängigkeit von Betriebsparametern, wie Drehzahl, Öltemperatur oder Lastzustand der Brennkraftmaschine die Ölfördermenge und damit der Öldruck zur Reduzierung der aufgenommenen Antriebsleistung angepaßt werden. Der Stellkolben 54 des Regelventils 52 wird über ein im Motorsteuergerät abgelegtes Kennlinienfeld angesteuert. Bei der in Fig. 1 dargestellten Position des Stellkolbens 54 wird der Eingang 50 des Regelventils 52 vollständig verschlossen; damit ist der Druck im ersten und im zweiten Druckraum 36, 44 gleich groß, so dass der Stellkolben 28 aufgrund der Spiralfeder 40 eine Position innerhalb der Ventilbohrung 30 einnimmt, bei der die Exzentrizität der Lage des Hubringes 12 bezogen auf die Rotordrehachse der Flügelzellenpumpe 2 maximal ist. Gibt der Stellkolben 54 den Eingang 50 frei (siehe Fig. 2), so fließt über die Stufenbohrung 62 ein bestimmter Ölvolumenstrom über die Hydraulikleitung 48 zum Ölvorratsbehälter 60 und damit zur Saugseite der Flügelzellenpumpe 2 ab. Aufgrund der Drosselwirkung der Stufenbohrung 62 wird zwischen der Vorder- und der Kolbenrückseite 34, 37 ein Differenzdruck erzeugt, so dass der Druck im zweiten Druckraum 44 gegenüber dem im ersten Druckraum 36 abgesenkt ist. Damit verändert sich die Verstellcharakteristik des Stellkolbens 28 und dieser wird, wie in Fig. 2 dargestellt, entgegen der Federkraft der Spiralfeder 40 in Richtung des Verschlusselementes 42 bewegt. Damit wird über die Stellstange 24 und die Anlenkzunge 18 die Lage des Hubringes 12 bezogen auf die Rotordrehachse dergestalt verändert, dass die Ölfördermenge der Flügelzellenpumpe 2 und damit der Öldruck reduziert wird. Entsprechend dem in Fig. 3 dargestellten Kennlinienfeld, welches im Motorsteuergerät abgelegt ist, können in Abhängigkeit von Öltemperatur und Drehzahl der Brennkraftmaschine beliebige Ölvolumenströme eingestellt werden, die dem entsprechenden Öldruckbedarf des Motors angepasst sind. So wird beispielsweise bei niedrigen Drehzahlen ein deutlich geringerer Öldruck für eine ausreichende Lagerversorgung benötigt, als bei hohen Drehzahlen. Extrem hohe bzw. niedrige Öltemperaturen erfordern einen höheren Öldruck, um einerseits dem höheren Kühlungsbedarf der Lager gerecht zu werden und andererseits den Leitungsdruckverlust und den Lagereintrittsdruck bei niedrigen Öltemperaturen kompensieren zu können. Darüber hinaus wird bei einem durch die Stellung der Drosselklappe signalisierten hohen Lastzustand des Motors ein höherer Öldruck als bei kleineren und mittleren Lasten benötigt.In the following, the operation of the device for controlling the pump power of the vane pump will be explained in more detail. The rigidly driven by the engine of the engine vane pump promotes depending on operating parameters, based on the control diagram in Fig. 3 will be explained in more detail, a certain oil flow to the consumers of the internal combustion engine. In this case, the pressure chamber 36 of the pressure regulating valve 26 is connected to the pressure side of the vane pump 2. Depending on the pressure prevailing in the first pressure chamber 36 oil pressure, the position of the cam ring 12 is adjusted relative to the rotor axis of rotation and thus the oil flow per rotor revolution. Thus, as is well known, funded by the vane pump 2 oil flow between a maximum flow rate (see Fig. 1 ) and a zero flow rate (see Fig. 2 ) are infinitely adjustable. As explained in the introduction, the activation of the pressure control valve 26 explained in greater detail below can be used to further reduce the input drive power of the vane pump 2 as a function of operating parameters such as speed, oil temperature or load state of the internal combustion engine, thus matching the oil delivery rate and thus the oil pressure to reduce the input drive power become. The control piston 54 of the control valve 52 is controlled via a stored in the engine control unit characteristic field. At the in Fig. 1 shown position of the actuating piston 54, the input 50 of the control valve 52 is completely closed; Thus, the pressure in the first and in the second pressure chamber 36, 44 of equal size, so that the actuating piston 28 due to the coil spring 40 occupies a position within the valve bore 30, wherein the eccentricity of the position of the cam ring 12 relative to the rotor axis of rotation of the vane pump 2 maximum is. If the control piston 54 releases the input 50 (see Fig. 2 ), so flows through the stepped bore 62, a certain oil volume flow via the hydraulic line 48 to the oil reservoir 60 and thus to the suction side of the vane pump 2 from. Due to the throttling effect of the stepped bore 62, a differential pressure is generated between the front and the piston rear side 34, 37, so that the pressure in the second pressure chamber 44 is lowered relative to that in the first pressure chamber 36. This changes the adjustment characteristic of the adjusting piston 28 and this is, as in Fig. 2 shown, against the spring force of the coil spring 40 moves in the direction of the closure element 42. Thus, the position of the cam ring 12 is changed over the adjusting rod 24 and the coupling tongue 18 relative to the rotor axis such that the oil flow rate of the vane pump 2 and thus the oil pressure is reduced. According to the in Fig. 3 shown characteristic field, which is stored in the engine control unit, depending on the oil temperature and engine speed any oil volume flows can be adjusted, which are adapted to the corresponding oil pressure requirements of the engine. Thus, for example, at low speeds, a significantly lower oil pressure is needed for a sufficient stock supply, as at high speeds. Extremely high or low oil temperatures require a higher oil pressure, on the one hand to meet the higher cooling requirements of the bearings and on the other hand to be able to compensate for the line pressure loss and the bearing inlet pressure at low oil temperatures. In addition, at a signaled by the position of the throttle high load condition of the engine, a higher oil pressure is required than for smaller and medium loads.
  • Bei Motoren, die zur Kolbenkühlung Ölspritzdüsen verwenden, die bei einem bestimmten Schwellenöldruck öffnen, besteht nunmehr die Möglichkeit, die Kolbenspritzdüsen über das im Motorsteuergerät hinterlegte Kennfeld zu steuern. Dadurch werden zusätzlich die Reibungsverluste gesenkt und der erforderliche Förderstrom zur Motorversorgung verringert.In the case of engines which use oil spray nozzles for piston cooling which open at a specific threshold oil pressure, it is now possible to control the piston spray nozzles via the characteristic map stored in the engine control unit. This additionally reduces the friction losses and reduces the required flow rate to the motor supply.
  • Im Zusammenhang mit der vorgeschlagenen betriebspunktabhängigen Öldrucksteuerung ist weiterhin eine Selbstkalibrierung vorgesehen. Wie anhand von Fig. 4 veranschaulicht, wird dabei der Soll - Öldruck mit dem ist - Öldruck verglichen. Weicht der Ist - Öldruck vom Soll - Öldruck um ein vorher definiertes Δp ab, so wird die Steuerkurve durch einen Korrekturfaktor so lange verschoben, bis das Δp dem vorgegebenen Kriterium entspricht. Hintergrund für die vorgesehene Selbstkalibrierung ist die Tatsache, dass sich der Ölbedarf des Motors über seine Lebensdauer aufgrund von Lagerverschleiss, Pumpenverschleiss oder sich ändernder Ölviskosität verändert.In connection with the proposed operating point-dependent oil pressure control a self-calibration is still provided. As based on Fig. 4 illustrated, the target oil pressure is compared with the is - oil pressure. If the actual oil pressure deviates from the setpoint oil pressure by a previously defined Δp, then the control curve is replaced by a Correction factor shifted until the Δp corresponds to the specified criterion. The background to the planned self-calibration is the fact that the oil requirement of the engine changes over its service life due to bearing wear, pump wear or changing oil viscosity.

Claims (6)

  1. Device for regulating the pumping capacity of an engine-oil pump, designed as a vane-cell pump (2), for an internal combustion engine, which vane-cell pump (2) has a rotor body, rotor vanes which are radially displaceable in the rotor body and a lifting ring, of which the position with respect to the rotor axis of rotation can be set as a function of operating parameters of the internal combustion engine in order to vary the feed volume, there being formed on the piston rear side of an actuating piston (28) guided in a valve bore (30) of a pressure-regulating valve (26) a pressure space (44) in which a spring element (40) is additionally received, and with a hydraulic line (48) which is connected to the pressure space (44) and which leads via a regulating valve (52) to the suction side of the vane-cell pump, the feed volume of the vane-cell pump being variable as a function of an oil volume flow set in the throttle bore (62), characterized in that the lifting ring (12) is articulated on the actuating piston (28) which is acted upon on a piston front side (34) by the engine-oil pressure, the piston front side (34) being connected to the piston rear side (37) via a throttle bore (62) arranged in the actuating piston.
  2. Device according to Claim 1, characterized in that the actuating piston (28) has on its rear side a reception orifice (38) in which the spring element (40) is at least partially guided and supported, the latter being designed as a helical spring.
  3. Device according to Claim 1 or 2, characterized in that the oil stream returnable to the suction side of the vane-cell pump (2) can be set via the regulating valve (52) arranged in the hydraulic line (48).
  4. Device according to Claim 3, characterized in that the oil stream is controlled as a function of operating parameters of the internal combustion engine, such as rotational speed, load or engine-oil temperature.
  5. Device according to one of the preceding claims, characterized in that, for an oil-pressure control of the vane-cell pump as a function of the operating point, a characteristic map is stored in a control unit, by means of which characteristic map the oil pressure is fixed as a function of the rotational speed, of the engine-oil temperature or of the load state of the internal combustion engine.
  6. Device according to Claim 5, characterized in that the characteristic map can be calibrated by means of a correcting factor.
EP20030740393 2002-08-28 2003-07-01 Device for adjusting the pumping capacity of a lubricant pump for an internal combustion engine Expired - Fee Related EP1537335B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE2002139364 DE10239364A1 (en) 2002-08-28 2002-08-28 Device for controlling the pump output of a lubricant pump for an internal combustion engine
DE10239364 2002-08-28
PCT/EP2003/006971 WO2004020831A1 (en) 2002-08-28 2003-07-01 Device for adjusting the pumping capacity of a lubricant pump for an internal combustion engine

Publications (2)

Publication Number Publication Date
EP1537335A1 EP1537335A1 (en) 2005-06-08
EP1537335B1 true EP1537335B1 (en) 2008-09-24

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EP20030740393 Expired - Fee Related EP1537335B1 (en) 2002-08-28 2003-07-01 Device for adjusting the pumping capacity of a lubricant pump for an internal combustion engine

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Country Link
US (1) US7549848B2 (en)
EP (1) EP1537335B1 (en)
JP (1) JP2005520096A (en)
AT (1) AT409285T (en)
DE (2) DE10239364A1 (en)
WO (1) WO2004020831A1 (en)

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DE50310547D1 (en) 2008-11-06
AT409285T (en) 2008-10-15
US20050232785A1 (en) 2005-10-20
DE10239364A1 (en) 2004-03-18
WO2004020831A1 (en) 2004-03-11
JP2005520096A (en) 2005-07-07
EP1537335A1 (en) 2005-06-08
US7549848B2 (en) 2009-06-23

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