EP0758047B1 - Method for operating an hydraulically driven and regulated camshaft phasing device for internal combustion engine - Google Patents

Method for operating an hydraulically driven and regulated camshaft phasing device for internal combustion engine Download PDF

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Publication number
EP0758047B1
EP0758047B1 EP96108399A EP96108399A EP0758047B1 EP 0758047 B1 EP0758047 B1 EP 0758047B1 EP 96108399 A EP96108399 A EP 96108399A EP 96108399 A EP96108399 A EP 96108399A EP 0758047 B1 EP0758047 B1 EP 0758047B1
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EP
European Patent Office
Prior art keywords
camshaft
controlled
internal combustion
valve
operating
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.)
Expired - Lifetime
Application number
EP96108399A
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German (de)
French (fr)
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EP0758047A1 (en
Inventor
Roland Barth
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP0758047A1 publication Critical patent/EP0758047A1/en
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Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/34403—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using helically teethed sleeve or gear moving axially between crankshaft and camshaft
    • F01L1/34406—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using helically teethed sleeve or gear moving axially between crankshaft and camshaft the helically teethed sleeve being located in the camshaft driving pulley
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34446—Fluid accumulators for the feeding circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/01—Starting

Definitions

  • the invention relates to one according to the preamble features of the claim 1 designed method for operating a hydraulically controlled / regulated Camshaft adjusting device for internal combustion engines.
  • EP-B 0 245 791 describes one operated according to the generic method Camshaft adjusting device known in which the mechanical actuating device by appropriate choice of the direction of a helical or helical toothing is designed relative to the direction of rotation of the camshaft so that at Failure of the control / regulating hydraulics in the late position to the stop brought. This is to ensure engine operation when the internal combustion engine is cold started with the generic hydraulic system principally to quickly undo towards early adjustment, however, e.g. Early adjustment to be achieved within one second no longer ensured during longer breaks in operation of the internal combustion engine due to leaks in one of the two valves, the pressure level in the pressure accumulator is reduced.
  • the invention has for its object the generic operating method for a camshaft adjusting device with a simple structure to improve that a rapid early adjustment of the camshaft can be achieved depending on the start is.
  • valve-controlled pressure accumulator connectable to the hydraulic circuit advantageously, with a simple structure, a method for the fastest possible Early adjustment of the camshaft achieved when starting the internal combustion engine.
  • the method according to the invention is schematic with reference to one in the drawing Hydraulic circuit shown for a camshaft adjusting device described.
  • a camshaft adjusting device 1 of a not shown Internal combustion engine comprises a mechanical actuating device 2 and one hydraulic actuating device 3.
  • the mechanical actuating device 2 effects about their teeth 4 and 5 according to the drive direction according to the arrow "A" of the driven wheel 6 when the hydraulic actuating device 3 is ineffective a late position of a camshaft 7, a piston 8 of the Actuator 3 assumes an end position "B".
  • the pump 9, supply line 11, return line 12 and 4/3-way valve 13 in essentially formed hydraulic circuit 16 is upstream of the check valve 10 A pressure accumulator 19 via a line 17 and a 2/2-way valve 18 connected.
  • the one arranged in series with the pressure accumulator 19 Electromagnetically actuated 2/2-way valve 18 has in the with Pump-side hydraulic circuit 16 connected pressure accumulator inlet path 17 'a seat valve 20.
  • the seat valve 20 serves to retain Pressure medium from the hydraulic circuit 16 in the pressure accumulator 19.
  • control unit 21 denotes an electronic control unit, which is connected via signal lines 22 is connected to an ignition system 23.
  • Another control line 24 is connected the electromagnetically actuated 4/3-way valve 13 connected such that the Inlet line 11 with the control chamber 14 in the late position of the camshaft 7 standing piston 8 is connectable.
  • the control unit 21 further signal line 25 to the electromagnetically actuated 2/2-way valve 18, to close the pressure accumulator 19 with the inlet line 11 via its outlet path 17 " connect.

Description

Die Erfindung bezieht sich auf ein nach Oberbegriffsmerkmalen des Patentanspruches 1 gestaltetes Verfahren zum Betreiben einer hydraulisch gesteuerten/geregelten Nockenwellen-Verstellvorrichtung für Brennkraftmaschinen.The invention relates to one according to the preamble features of the claim 1 designed method for operating a hydraulically controlled / regulated Camshaft adjusting device for internal combustion engines.

Aus der EP-B 0 245 791 ist eine nach dem gattungsgemäßen Verfahren betriebene Nockenwellen-Verstellvorrichtung bekannt, bei der die mechanische Stelleinrichtung durch entsprechende Wahl der Richtung einer Schräg- oder Schraubverzahnung relativ zur Drehrichtung der Nockenwelle so ausgelegt ist, daß bei Ausfall der Steuer-/Regel-Hydraulik die Nockenwelle in Spät-Stellung auf Anschlag gebracht ist. Diese zur Sicherung des Motorbetriebes getroffene Auslegung ist zwar bei einem Kaltstart der Brennkraftmaschine mit dem gattungsgemäßen Hydrauliksystem prinzipiell rasch rückgängig zu machen in Richtung Früh-Verstellung, jedoch ist eine z.B. innerhalb einer Sekunde zu erzielende Früh-Verstellung dann nicht mehr sichergestellt bei längeren Betriebspausen der Brennkraftmaschine mit durch Leckagen an einem der beiden Ventile abgesenktem Druckniveau im Druckspeicher. EP-B 0 245 791 describes one operated according to the generic method Camshaft adjusting device known in which the mechanical actuating device by appropriate choice of the direction of a helical or helical toothing is designed relative to the direction of rotation of the camshaft so that at Failure of the control / regulating hydraulics in the late position to the stop brought. This is to ensure engine operation when the internal combustion engine is cold started with the generic hydraulic system principally to quickly undo towards early adjustment, however, e.g. Early adjustment to be achieved within one second no longer ensured during longer breaks in operation of the internal combustion engine due to leaks in one of the two valves, the pressure level in the pressure accumulator is reduced.

Der Erfindung liegt die Aufgabe zugrunde, das gattungsgemäße Betriebs-Verfahren für eine Nockenwellen-Verstellvorrichtung mit einfachem Aufbau so zu verbessern, daß eine startabhängig rasche Früh-Verstellung der Nockenwelle erzielbar ist.The invention has for its object the generic operating method for a camshaft adjusting device with a simple structure to improve that a rapid early adjustment of the camshaft can be achieved depending on the start is.

Diese Aufgabe ist mit dem Patentanspruch 1 dadurch gelöst, daß bei einem Start der Brennkraftmaschine ein in dem Druckspeicher über ein gesondertes Wegeventil gesteuert bevorratet gehaltenes Druckmedium in Abhängigkeit eines Startsignals über das Wegeventil gesteuert freigegeben wird zur Beaufschlagung des Verstellkolbens für eine Früh-Verstellung der Nockenwelle durch die Stelleinrichtung. This object is achieved with claim 1 in that at a start the internal combustion engine in the pressure accumulator via a separate directional valve controlled pressure medium held in dependence on a start signal controlled via the directional valve is released to act on the Adjusting piston for an early adjustment of the camshaft by the adjusting device.

Mit der Erfindung eines aus dem Hydraulikkreis aufladbaren und über ein Startsignal ventilgesteuert an den Hydraulikkreis anschließbaren Druckspeichers ist in vorteilhafter Weise bei einfachem Aufbau ein Verfahren zur raschestmöglichen Früh-Verstellung der Nockenwelle bei einem Start der Brennkraftmaschine erzielt. Bei entsprechender Dimensionierung des Hydraulikkreises kann der Druckanstieg im Hydraulikkreis beim Motorstart im wesentlichen nach einer Sprungfunktion erfolgen, womit in vorteilhafter Weise eine Früh-Stellung in Bruchteilen einer Sekunde erzielt ist.With the invention of a rechargeable from the hydraulic circuit and a Start signal is valve-controlled pressure accumulator connectable to the hydraulic circuit advantageously, with a simple structure, a method for the fastest possible Early adjustment of the camshaft achieved when starting the internal combustion engine. With appropriate dimensioning of the hydraulic circuit, the pressure increase in the hydraulic circuit when the engine starts, essentially after a step function take place, which advantageously an early position in fractions of a Second is achieved.

Mit dem erfindungsgemäßen Verfahren ist es zur Schonung von mit den Hydraulikkreis verbundenen Einrichtungen vorteilhaft, den Druck im Hydraulikkreis beim Abstellen der Brennkraft gezielt abzusenken.With the method according to the invention it is to protect the Hydraulic circuit connected devices advantageous, the pressure in the hydraulic circuit selectively lower when switching off the internal combustion engine.

Das erfindungsgemäße Verfahren ist anhand eines in der Zeichnung schematisch dargestellten Hydraulikkreises für eine Nockenwellen-Verstellvorrichtung beschrieben.The method according to the invention is schematic with reference to one in the drawing Hydraulic circuit shown for a camshaft adjusting device described.

Eine Nockenwellen-Verstellvorrichtung 1 einer nicht näher gezeigten Brennkraftmaschine umfaßt eine mechanische Stelleinrichtung 2 und eine hydraulische Betätigungseinrichtung 3. Die mechanische Stelleinrichtung 2 bewirkt über ihre Verzahnungen 4 und 5 entsprechend der Antriebsrichtung gemäß Pfeil "A" des Abtriebsrades 6 bei unwirksamer hydraulischer Betätigungseinrichtung 3 eine Spät-Stellung einer Nockenwelle 7, wobei ein Kolben 8 der Betätigungseinrichtung 3 eine Endstellung "B" einnimmt. A camshaft adjusting device 1 of a not shown Internal combustion engine comprises a mechanical actuating device 2 and one hydraulic actuating device 3. The mechanical actuating device 2 effects about their teeth 4 and 5 according to the drive direction according to the arrow "A" of the driven wheel 6 when the hydraulic actuating device 3 is ineffective a late position of a camshaft 7, a piston 8 of the Actuator 3 assumes an end position "B".

Weiter ist die Brennkraftmaschine mit einer z. B. von ihr angetriebenen Schmierölpumpe 9 ausgerüstet, die über ein Rückschlagventil 10 in eine Zulaufleitung 11 der hydraulischen Betätigungseinrichtung 3 fördert. Dieser ist weiter eine Rücklaufleitung 12 zugeordnet. Ein elektromagnetisch gesteuertes 4/3-Wegeventil 13 verbindet die Leitungen 11,12 mit beidseitig des Kolbens 8 vorgesehenen Steuerkammern 14,15 zur jeweils betriebspunktabhängig gezielten Verstellung in Richtung früh oder spät der Nockenwelle 7.Next is the internal combustion engine with a z. B. driven by her lubricating oil pump 9 equipped, which via a check valve 10 in an inlet line 11 hydraulic actuator 3 promotes. This is also a return line 12 assigned. An electromagnetically controlled 4/3-way valve 13 connects the lines 11, 12 with control chambers provided on both sides of the piston 8 14, 15 for the specific adjustment depending on the operating point in the direction early or late camshaft 7.

Dem aus Pumpe 9, Zulaufleitung 11, Rücklaufleitung 12 und 4/3-Wegeventil 13 im wesentlichen gebildeten Hydraulikkreis 16 ist stromauf des Rückschlagventils 10 über eine Leitung 17 und ein 2/2-Wegeventil 18 ein Druckspeicher 19 angeschlossen. Das mit dem Druckspeicher 19 in Reihe angeordnete, elektromagnetisch betätigbare 2/2-Wegeventil 18 weist in dem mit dem pumpenseitigen Hydraulikkreis 16 in Verbindung stehenden Druckspeicher-Zulaufweg 17' ein Sitzventil 20 auf. Das Sitzventil 20 dient der Rückhaltung von Druckmedium aus dem Hydraulikkreis 16 im Druckspeicher 19.The pump 9, supply line 11, return line 12 and 4/3-way valve 13 in essentially formed hydraulic circuit 16 is upstream of the check valve 10 A pressure accumulator 19 via a line 17 and a 2/2-way valve 18 connected. The one arranged in series with the pressure accumulator 19 Electromagnetically actuated 2/2-way valve 18 has in the with Pump-side hydraulic circuit 16 connected pressure accumulator inlet path 17 'a seat valve 20. The seat valve 20 serves to retain Pressure medium from the hydraulic circuit 16 in the pressure accumulator 19.

Mit 21 ist eine elektronische Steuereinheit bezeichnet, die über Signalleitungen 22 mit einer Zündanlage 23 in Verbindung steht. Eine weitere Steuerleitung 24 ist mit dem elektromagnetisch betätigbaren 4/3-Wegeventil 13 derart verbunden, daß die Zulaufleitung 11 mit der Steuerkammer 14 des in Spät-Stellung der Nockenwelle 7 stehenden Kolbens 8 verbindbar ist. Schließlich führt von der Steuereinheit 21 eine weitere Signalleitung 25 zum elektromagnetisch betätigbaren 2/2-Wegeventil 18, um über dessen Ablaufweg 17" den Druckspeicher 19 mit der Zulaufleitung 11 zu verbinden.21 denotes an electronic control unit, which is connected via signal lines 22 is connected to an ignition system 23. Another control line 24 is connected the electromagnetically actuated 4/3-way valve 13 connected such that the Inlet line 11 with the control chamber 14 in the late position of the camshaft 7 standing piston 8 is connectable. Finally, one leads from the control unit 21 further signal line 25 to the electromagnetically actuated 2/2-way valve 18, to close the pressure accumulator 19 with the inlet line 11 via its outlet path 17 " connect.

Beim Start der nicht näher gezeigten Brennkraftmaschine mittels eines Zündschlüssels 26 bewirken Signale auf den Leitungen 24 und 25 eine Steuerung der Wegeventile 13 und 18 derart, daß aus dem im wesentlichen gefüllten Druckspeicher 19 Druckmedium über die Leitung 11 dem Kolben 8 im Steuerraum 14 für eine Verlagerung aus der Spät- in eine Früh-Verstellung der Nockenwelle 7 zugeführt wird, wobei der Druckaufbau am Kolben 8 in vorteilhafter Weise nach Art einer Sprungfunktion erfolgt. Mit diesem erfindungsgemäßen Betriebs-Verfahren kann bei jedem Start, insbesondere Kaltstart der Brennkraftmaschine, eine vorteilhafte Früh-Verstellung der Nockenwelle 7 mit erheblich reduzierter Ventilüberschneidung erzielt werden zur Absenkung nachteilig wirkender Anteile im Abgas.When starting the internal combustion engine, not shown in detail, by means of a Ignition key 26 cause signals on lines 24 and 25 to control the directional control valves 13 and 18 such that from the substantially filled Pressure accumulator 19 pressure medium via line 11 to piston 8 in the control room 14 for a shift from the late to an early adjustment of the camshaft 7 is supplied, the pressure build-up on the piston 8 in an advantageous manner according to Art a jump function takes place. With this operating method according to the invention can with each start, especially cold start of the internal combustion engine advantageous early adjustment of the camshaft 7 with significantly reduced Valve overlap can be achieved in order to reduce the disadvantageously acting parts in the Exhaust gas.

Um eventuell den Bedarf an Steuerstrom der Wegeventile 13 und 18 gering zu halten, können diese z. B. hydraulisch vorgesteuert sein.In order to possibly reduce the need for control current of the directional control valves 13 and 18 can hold this z. B. be hydraulically piloted.

Claims (3)

  1. A method of operating an open-loop/closed-loop hydraulically controlled camshaft adjusting device for internal combustion engines,
    wherein a mechanical adjusting means (2) designed for retarded adjustment of the camshaft (7) is controlled by a piston (8) which is hydraulically actuated at at least one end and
    which is supplied with a pressure medium from a hydraulic circuit (16) via a control valve (13) which operates in dependence on the operating point, wherein
    the pressure medium is acted upon by a pressure reservoir (19),
       characterised in that
    when the engine starts, a pressure medium stored in the pressure reservoir (19) and controlled by a separate directional control valve (18) is released in controlled manner via the directional valve (18) in dependence on a start signal in order to actuate the adjusting piston (8) for early adjustment of the camshaft (7) by the adjusting means (2).
  2. A method according to claim 1,
    characterised by use of an electromagnetically actuated 2/2-way valve (18) which is in series with the pressure reservoir (19) and
    comprises a seat valve (20) in the feed path (17') of the pressure reservoir connected to the hydraulic circuit (16) on the pump side.
  3. A method according to claims 1 and 2,
    characterised by use of a pilot-controlled electromagnetically operated 2/2-way valve (18).
EP96108399A 1995-08-09 1996-05-28 Method for operating an hydraulically driven and regulated camshaft phasing device for internal combustion engine Expired - Lifetime EP0758047B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19529277A DE19529277A1 (en) 1995-08-09 1995-08-09 Method for operating a hydraulically controlled / regulated camshaft adjusting device for internal combustion engines
DE19529277 1995-08-09

Publications (2)

Publication Number Publication Date
EP0758047A1 EP0758047A1 (en) 1997-02-12
EP0758047B1 true EP0758047B1 (en) 1999-06-30

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EP96108399A Expired - Lifetime EP0758047B1 (en) 1995-08-09 1996-05-28 Method for operating an hydraulically driven and regulated camshaft phasing device for internal combustion engine

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US (1) US5704317A (en)
EP (1) EP0758047B1 (en)
DE (2) DE19529277A1 (en)
ES (1) ES2134535T3 (en)

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Also Published As

Publication number Publication date
US5704317A (en) 1998-01-06
ES2134535T3 (en) 1999-10-01
DE19529277A1 (en) 1997-02-13
DE59602318D1 (en) 1999-08-05
EP0758047A1 (en) 1997-02-12

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