EP1255027B1 - Mechanic control of variable lift of an intake valve of an internal combustion engine - Google Patents

Mechanic control of variable lift of an intake valve of an internal combustion engine Download PDF

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Publication number
EP1255027B1
EP1255027B1 EP01110782A EP01110782A EP1255027B1 EP 1255027 B1 EP1255027 B1 EP 1255027B1 EP 01110782 A EP01110782 A EP 01110782A EP 01110782 A EP01110782 A EP 01110782A EP 1255027 B1 EP1255027 B1 EP 1255027B1
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EP
European Patent Office
Prior art keywords
internal combustion
lifting lever
combustion engine
valve
operates
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
EP01110782A
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German (de)
French (fr)
Other versions
EP1255027A1 (en
Inventor
Bernhard Morrn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STS System Tech Services GmbH
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STS System Tech Services GmbH
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Filing date
Publication date
Application filed by STS System Tech Services GmbH filed Critical STS System Tech Services GmbH
Priority to ES01110782T priority Critical patent/ES2185519T3/en
Priority to AT01110782T priority patent/ATE272787T1/en
Priority to DE50103100T priority patent/DE50103100D1/en
Priority to EP01110782A priority patent/EP1255027B1/en
Priority to US10/137,971 priority patent/US6792903B2/en
Publication of EP1255027A1 publication Critical patent/EP1255027A1/en
Application granted granted Critical
Publication of EP1255027B1 publication Critical patent/EP1255027B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0068—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/1828—Cam, lever, and slide

Definitions

  • the present invention relates to a mechanically controllable valve lift adjustment.
  • the present invention further relates to an internal combustion engine with a mechanical adjustable valve stroke adjustment and a method for regulating the valve strokes in internal combustion engines.
  • a vacuum occurs when the load changes from full to partial load in the intake system, through which more fuel than needed is fed into the cylinders is sucked. This increases the fuel consumption of the internal combustion engine, and unburned fuel may leak into the environment.
  • the object is therefore to provide a device with which the fuel consumption of an internal combustion engine can be reduced.
  • valve lift adjustment according to the invention has additionally a roller rocker arm, which on the one hand matches the working curve of the Lever cooperates and is driven by this and on the other hand with the valve cooperates and moves it.
  • valve lift adjustment has a means with which the lift is rotatable and slidably mounted in a backdrop. This is preferably Means a role.
  • the backdrop takes up the means and thus represents its leadership, within which the medium and with it the lifting lever moves under pressure and / or tension.
  • the backdrop can have any shape which is chosen by the person skilled in the art that the lifting lever preferably along a certain straight line and / or curve is movable.
  • the backdrop preferably has a substantially rectangular shape, whereby the short sides of the rectangle are preferably designed in the form of a semicircle are. This shape of the backdrop is particularly suitable for holding roles.
  • This backdrop can be horizontal or vertical or at any angle Be arranged horizontally or vertically.
  • the internal combustion engine has at least two cylinders, wherein at least one lifting lever is assigned to each cylinder. These are lifting levers through a driven bar located in the housing of the internal combustion engine Slidably mounted is changed in position to increase the stroke of the cylinder adjust. Preferably, the bar is forward and along a straight line moved back.
  • a cylinder two intake valves and accordingly two lifting levers.
  • These two lifting levers can according to the invention either with a driven bar or with two driven strips are moved, in the latter case one each Lifting lever is moved by a bar.
  • the latter embodiment has the Advantage that the lifting lever and thus the valves are adjusted independently of each other can be, which makes the control of the internal combustion engine even more variable can be done. In extreme cases, a so-called 0-stroke is implemented for a valve, while the other valve is fully opened.
  • the bar can be driven in any manner familiar to those skilled in the art.
  • the drive is hydraulic or pneumatic, with a electric solenoid, with an electric motor, preferably a gear has or with a piezomotor.
  • the means that cooperate with the camshaft is a roller.
  • valve control according to the invention is suitable for valves of any kind.
  • the valves are valves of internal combustion engines, particularly preferred Intake valves for internal combustion engines.
  • Another object of the present invention therefore relates to an internal combustion engine, which has at least one valve control according to the invention.
  • Another object of the present invention is a method for control of the stroke of an intake valve of an internal combustion engine using the Valve control according to the invention, in which at least two lifting levers with one driven bar according to the performance requirement of the Internal combustion engine to be moved in the backdrop.
  • the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact, which reduces the stroke of the valve causes.
  • the lifting lever At full load, the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact with the maximum stroke of the valve causes.
  • the present invention has the advantage that the valve lift depending on the performance requirement can be increased or decreased.
  • Valve stroke adjustment reduces the gas exchange work in Otto engines and it this results in fuel savings of up to 10% compared to valve control according to the state of the art.
  • the mechanical control is much easier and thus cheaper to produce than z.
  • the valve control according to the invention is very robust and not maintenance-prone. By using a bar that holds the lift levers in place moves, far fewer components are required than in the prior art.
  • Figure 1a shows the valve control according to the invention for a two-valve cylinder.
  • Figure 1b shows an embodiment of the mounting of the lifting lever in a four-valve cylinder.
  • Figure 2 shows another embodiment of the mounting of the lifting lever in a four-valve cylinder.
  • Figure 3 shows a parallelogram for the drive of the bar.
  • Figure 4 shows two actuators for driving the bar
  • Figure 5 shows two actuators for driving the bar with a power balance 32
  • FIG. 1a the valve control according to the invention for a two-valve engine (an intake and an exhaust valve) is shown.
  • a lever 4 is slidably and rotatably mounted in a link 5 with the roller 30.
  • the lifting lever is moved by the bar 8 and the return spring 14 in the backdrop.
  • the backdrop 5 and the mounting or guidance of the strip 8 are integrated in a cover 11 of the engine, which is mounted on the cylinder head 13 or an intermediate support 12 in a precisely aligned manner.
  • the person skilled in the art understands that the lifting lever 4 can also be held in a specific position within the setting by the strip 8 and the return spring 14.
  • the strip 8 extends perpendicular to the plane of the paper along all of the cylinders or their intake valve which are arranged in a row in the engine.
  • the position of the bar 8 is detected by a displacement sensor (not shown) or, for example, by the revolutions of an electric motor that drives the bar and transmitted to an electronic control unit as the actual value.
  • This control unit regulates the desired position of the intake valve on the basis of a target / actual value comparison.
  • the lifting lever 4 has a further roller 31, which is connected to the camshaft 28 cooperates and which drives the lifting lever 4.
  • the lifting lever 4 has a working curve 6. This work curve is in contact with the roller 7, which is attached to the roller rocker arm 1. The Roller rocker arm 1 in turn moves the valve 3 (partially shown).
  • the left part of the working curve is a circle around the center of the role Roll 30. This ensures a zero stroke in the position shown.
  • the transition from the left (zero stroke range) to the right (stroke range) of the Working curve defines the acceleration ramp of the intake valve movement.
  • the acceleration ramp of the camshaft 28 is only used for acceleration of the lifting lever 4 and no longer acts on the valve acceleration.
  • Figure 1b shows the detail of a four-valve engine (two intake and two exhaust valves).
  • the engine has two intake valves per cylinder, the stroke behavior of which is regulated independently of one another by the two lift levers 4a, 4b, only the lift lever 4a being shown.
  • the strip 8 can be divided into two, which is represented by the strips 15, 16.
  • the strips 15, 16 are driven independently of one another.
  • the valve strokes of the two intake valves can be controlled independently of each other.
  • an inlet valve can be set to the 0 stroke and only the valve stroke of the other valve can be used for torque control.
  • the position of the respective bar 15, 16 is detected and used for control.
  • the strips 15, 16 also extend over all cylinders which are arranged in a row or their valves, the stroke of which changes the respective strip.
  • Figure 2 shows a further embodiment of the mounting of the lifting levers 4a, 4b in a four-valve cylinder.
  • the two lifting levers 4a, 4b are rotatably mounted on a common axis 17.
  • the axis 17 in turn is rotatably supported in a roller bearing 18.
  • the roller bearing 18 can be moved along the backdrop 5 by the bar 8.
  • the bar 8 is not divided into two.
  • the axis 17 can also extend over all cylinders, so that all lifting levers on are lined up one axis and z. B. by spacer sleeves in the valve position being held.
  • Figure 3 shows a possible drive form of the strips 8 or strips 15, 16, which in the present example is a parallelogram formed by the strips 8 and 19 and the two levers 21.
  • the strips 8 and 19 and the levers 21 are rotatably connected to one another in the plane of the paper, with at least two levers being used in a four-cylinder engine and three or more levers 21 being used in a six-cylinder engine.
  • the bar 19 is mounted so that it can be displaced in both directions along the horizontal, which is indicated by the double arrow 20.
  • the bearings 22, which are located in the cylinder head, can be plain or roller bearings.
  • the strip 8 is guided through the bearings 23 in the cylinder head along a vertical line and its position can be determined by displacement sensors.
  • the bar 19 is adjusted by a motor 24 and a screw thread.
  • the position of the bar 8 and thus the set stroke of the inlet valve can be measured by a displacement sensor 25, which detects the position of the bar 19.
  • the position of the strip 8 can also be measured by detecting the engine revolutions.
  • a hydraulic system, a lifting magnet, a stepping motor, a mechanically operated lever or a cable pull are suitable for bringing about the adjustment of the bar 19.
  • the horizontal movement 20 of the bar 19 is supported by the springs 24 and 25.
  • FIG. 4 shows the drive of the strip 8 by at least two actuators 27.
  • actuators 27 can be, for example, lifting magnets, electric motors with or without a gear, piezomotors or mechanical, hydraulic or pneumatic means.
  • FIG. 5 also shows a force balance 32 which interacts with the actuators 27. This arrangement increases the accuracy of the idle valve stroke.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The present invention relates to a mechanically controllable valve lift adjustment. The present invention also relates to an internal combustion engine having a mechanically controllable valve lift adjustment and to a method of controlling the valve lift in internal combustion engines.

Description

Die vorliegende Erfindung betrifft eine mechanisch regelbare Ventilhubverstellung. Die vorliegende Erfindung betrifft ferner einen Verbrennungsmotor mit einer mechanisch regelbaren Ventilhubverstellung und ein Verfahren zum Regeln der Ventilhübe in Verbrennungsmotoren.The present invention relates to a mechanically controllable valve lift adjustment. The present invention further relates to an internal combustion engine with a mechanical adjustable valve stroke adjustment and a method for regulating the valve strokes in internal combustion engines.

Bei Verbrennungsmotoren tritt bei einem Lastwechsel von Voll- auf Teillast ein Unterdruck in der Sauganlage auf, durch den mehr Kraftstoff als benötigt in die Zylinder gesaugt wird. Dadurch erhöht sich der Kraftstoffverbrauch des Verbrennungsmotors, und es gelangt gegebenenfalls unverbrannter Kraftstoff in die Umwelt.In internal combustion engines, a vacuum occurs when the load changes from full to partial load in the intake system, through which more fuel than needed is fed into the cylinders is sucked. This increases the fuel consumption of the internal combustion engine, and unburned fuel may leak into the environment.

Es besteht deshalb die Aufgabe, eine Vorrichtung zur Verfügung zu stellen, mit der der Kraftstoffverbrauch eines Verbrennungsmotors reduziert werden kann.The object is therefore to provide a device with which the fuel consumption of an internal combustion engine can be reduced.

Diese Aufgabe wird durch die Bereitstellung einer mechanisch regelbaren Ventilhubverstellung für eine Brennkraftmaschine, die mehrere Zylinder aufweist, mit:

  • Mindestens einem Hubhebel pro Zylinder, der
    • ein Mittel, mit dem der Hubhebel drehbar und in einer Kulisse verschieblich gelagert ist,
    • ein Antriebsübertragungsmittel, das mit einer Nockenwelle, die den Hubhebel antreibt, zusammenwirkt und
    • eine Arbeitskurve
    aufweist,
  • Einem Mittel, das mit der verschieblichen, drehbaren Lagerung der Hubhebel zusammenwirkt und diese in den Kulissen verschiebt,
  • Einer Nockenwelle, die mit dem Antriebsübertragungsmittel des Hubhebels zusammenwirkt und diesen antreibt,
  • Mindestens einem Ventil pro Zylinder, das mit der Arbeitskurve jeweils eines Hubhebels zusammenwirkt und von diesem bewegt wird,
  • wobei das Mittel, das den Hubhebel verschiebt eine angetriebene Leiste ist, die in dem Gehäuse der Brennkraftmaschine verschieblich gelagert ist, gelöst.
This task is accomplished by providing a mechanically controllable valve lift adjustment for an internal combustion engine that has several cylinders, with:
  • At least one lifting lever per cylinder, the
    • a means with which the lifting lever is rotatably and displaceably mounted in a link,
    • a drive transmission means which cooperates with a camshaft which drives the lifting lever and
    • a working curve
    having,
  • A means that interacts with the movable, rotatable mounting of the lifting levers and moves them in the scenes,
  • A camshaft, which interacts with the drive transmission means of the lifting lever and drives it,
  • At least one valve per cylinder, which interacts with the working curve of a lifting lever and is moved by this,
  • wherein the means that moves the lifting lever is a driven bar that is slidably mounted in the housing of the internal combustion engine.

In einer anderen Ausführungsform weist die erfindungsgemäße Ventilhubverstellung zusätzlich einen Rollenschlepphebel auf, der einerseits mit der Arbeitskurve des Hubhebels zusammenwirkt und von diesem angetrieben wird und andererseits mit dem Ventil zusammenwirkt und dieses bewegt.In another embodiment, the valve lift adjustment according to the invention has additionally a roller rocker arm, which on the one hand matches the working curve of the Lever cooperates and is driven by this and on the other hand with the valve cooperates and moves it.

Erfindungsgemäß weist die Ventilhubverstellung ein Mittel auf, mit dem der Hubhebei drehbar und in einer Kulisse verschieblich gelagert ist. Vorzugsweise ist dieses Mittel eine Rolle.According to the valve lift adjustment has a means with which the lift is rotatable and slidably mounted in a backdrop. This is preferably Means a role.

Die Kulisse nimmt das Mittel auf und stellt somit dessen Führung dar, innerhalb derer sich das Mittel und mit ihm der Hubhebel unter Druck und/oder Zug verschiebt. Die Kulisse kann eine beliebige Form aufweisen, die vom Fachmann so gewählt wird, daß der Hubhebel vorzugsweise entlang einer bestimmten Geraden und/oder Kurve verschiebbar ist.The backdrop takes up the means and thus represents its leadership, within which the medium and with it the lifting lever moves under pressure and / or tension. The The backdrop can have any shape which is chosen by the person skilled in the art that the lifting lever preferably along a certain straight line and / or curve is movable.

Vorzugsweise hat die Kulisse jedoch eine im wesentlichen rechteckige Form, wobei die kurzen Seiten des Rechtecks vorzugsweise in Form eines Halbkreises gestaltet sind. Diese Form der Kulisse eignet sich insbesondere zur Aufnahme von Rollen. Diese Kulisse kann horizontal oder vertikal oder in einem beliebigen Winkel zur Horizontalen bzw. Vertikalen angeordnet sein.However, the backdrop preferably has a substantially rectangular shape, whereby the short sides of the rectangle are preferably designed in the form of a semicircle are. This shape of the backdrop is particularly suitable for holding roles. This backdrop can be horizontal or vertical or at any angle Be arranged horizontally or vertically.

Erfindungsgemäß weist die Brennkraftmaschine mindestens zwei Zylinder auf, wobei jedem Zylinder mindestens ein Hubhebel zugeordnet ist. Diese Hubhebel werden durch eine angetriebene Leiste, die in dem Gehäuse der Brennkraftmaschine verschieblich gelagert ist in ihrer Lage verändert, um den Hub der Zylinder zu verstellen. Vorzugsweise wird die Leiste entlang einer Geraden vor- und zurückbewegt.According to the invention, the internal combustion engine has at least two cylinders, wherein at least one lifting lever is assigned to each cylinder. These are lifting levers through a driven bar located in the housing of the internal combustion engine Slidably mounted is changed in position to increase the stroke of the cylinder adjust. Preferably, the bar is forward and along a straight line moved back.

In einer bevorzugten Ausführungsform der vorliegenden Erfindung weist ein Zylinder zwei Einlaßventile und dementsprechend zwei Hubhebel auf. Diese beiden Hubhebel können erfindungsgemäß entweder mit einer angetriebenen Leiste oder mit zwei angetriebenen Leisten verschoben werden, wobei im letzteren Fall jeweils ein Hubhebel von einer Leiste verschoben wird. Die letztere Ausführungsform hat den Vorteil, daß die Hubhebel und damit die Ventile unabhängig voneinander verstellt werden können, wodurch die Steuerung der Brennkraftmaschine noch variabler erfolgen kann. Im Extremfall wird bei einem Ventil ein sogenannter 0-Hub realisiert, während das andere Ventil vollständig geöffnet wird.In a preferred embodiment of the present invention, a cylinder two intake valves and accordingly two lifting levers. These two lifting levers can according to the invention either with a driven bar or with two driven strips are moved, in the latter case one each Lifting lever is moved by a bar. The latter embodiment has the Advantage that the lifting lever and thus the valves are adjusted independently of each other can be, which makes the control of the internal combustion engine even more variable can be done. In extreme cases, a so-called 0-stroke is implemented for a valve, while the other valve is fully opened.

Die Leiste kann auf jedem dem Fachmann geläufige Weise angetrieben werden. Beispielsweise erfolgt der Antrieb hydraulisch oder pneumatisch, mit einem elektrischen Hubmagnet, mit einem Elektromotor, der vorzugsweise ein Getriebe aufweist oder mit einem Piezomotor.The bar can be driven in any manner familiar to those skilled in the art. For example, the drive is hydraulic or pneumatic, with a electric solenoid, with an electric motor, preferably a gear has or with a piezomotor.

Vorzugsweise ist das Mittel, das mit der Nockenwelle zusammenwirkt, eine Rolle.Preferably, the means that cooperate with the camshaft is a roller.

Die erfindungsgemäße Ventilsteuerung eignet sich für Ventile beliebiger Art. Vorzugsweise sind die Ventile jedoch Ventile von Verbrennungsmotoren, besonders bevorzugt Einlaßventile von Verbrennungsmotoren.The valve control according to the invention is suitable for valves of any kind. Preferably however, the valves are valves of internal combustion engines, particularly preferred Intake valves for internal combustion engines.

Ein weiterer Gegenstand der vorliegenden Erfindung betrifft deshalb einen Verbrennungsmotor, der mindestens eine erfindungsgemäße Ventilsteuerung aufweist.Another object of the present invention therefore relates to an internal combustion engine, which has at least one valve control according to the invention.

Ein weiterer Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Steuerung des Hubes eines Einlaßventiles eines Verbrennungsmotors unter Verwendung der erfindungsgemäßen Ventilsteuerung, bei dem zumindest zwei Hubhebel mit einer angetriebenen Leiste entsprechend der Leistungsanforderung an den Verbrennungsmotor in der Kulisse verschoben werden.Another object of the present invention is a method for control of the stroke of an intake valve of an internal combustion engine using the Valve control according to the invention, in which at least two lifting levers with one driven bar according to the performance requirement of the Internal combustion engine to be moved in the backdrop.

Bei Teillast wird der Hubhebel so verschoben und für eine gewisse Zeit in dieser Stellung gehalten, daß das Ventil oder der Rollenschlepphebel mit einem Teil der Arbeitskurve des Hubhebels in Kontakt steht, der einen reduzierten Hub des Ventils bewirkt.At partial load, the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact, which reduces the stroke of the valve causes.

Bei Vollast wird der Hubhebel so verschoben und für eine gewisse Zeit in dieser Stellung gehalten, daß das Ventil oder der Rollenschlepphebel mit einem Teil der Arbeitskurve des Hubhebels in Kontakt steht, der den maximalen Hub des Ventils bewirkt. At full load, the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact with the maximum stroke of the valve causes.

Die vorliegende Erfindung hat den Vorteil, daß der Ventilhub je nach Leistungsanforderung vergrößert oder verringert werden kann. Durch die erfindungsgemäße Ventilhubverstellung wird die Ladungswechselarbeit in Otto-Motoren reduziert und es ergeben sich Kraftstoffeinsparungen bis zu 10% im Vergleich zur Ventilsteuerung gemäß dem Stand der Technik. Die mechanische Steuerung ist wesentlich einfacher und damit kostengünstiger herzustellen als z. B. elektronische Steuerungen des Ventilhubes. Die erfindungsgemäße Ventilsteuerung ist sehr robust und nicht wartungsanfällig. Durch den Einsatz einer Leiste, die die Hubhebel in ihrer Lage verschiebt, werden wesentlich weniger Bauteile benötigt als beim Stand der Technik.The present invention has the advantage that the valve lift depending on the performance requirement can be increased or decreased. By the invention Valve stroke adjustment reduces the gas exchange work in Otto engines and it this results in fuel savings of up to 10% compared to valve control according to the state of the art. The mechanical control is much easier and thus cheaper to produce than z. B. electronic controls of Valve stroke. The valve control according to the invention is very robust and not maintenance-prone. By using a bar that holds the lift levers in place moves, far fewer components are required than in the prior art.

Im folgenden wird die Erfindung anhand der Abbildungen 1 bis 5 erläutert. Diese Erlauterungen sind lediglich beispielhaft und schränken den allgemeinen Erfindungsgedanken nicht ein.The invention is explained below with reference to FIGS. 1 to 5 . These explanations are only examples and do not limit the general idea of the invention.

Abbildung 1a zeigt die erfindungsgemäße Ventilsteuerung für einen Zweiventilzylinder. Figure 1a shows the valve control according to the invention for a two-valve cylinder.

Abbildung 1b zeigt eine Ausführungsform der Lagerung der Hubhebel bei einem Vierventilzylinder. Figure 1b shows an embodiment of the mounting of the lifting lever in a four-valve cylinder.

Abbildung 2 zeigt eine weitere Ausführungsform der Lagerung der Hubhebel bei einem Vierventilzylinder. Figure 2 shows another embodiment of the mounting of the lifting lever in a four-valve cylinder.

Abbildung 3 zeigt ein Parallelogramm zum Antrieb der Leiste. Figure 3 shows a parallelogram for the drive of the bar.

Abbildung 4 zeigt zwei Aktuatoren zum Antrieb der Leiste Figure 4 shows two actuators for driving the bar

Abbildung 5 zeigt zwei Aktuatoren zum Antrieb der Leiste mit einer Kraftwaage 32 Figure 5 shows two actuators for driving the bar with a power balance 32

In Figur 1a ist die erfindungsgemäße Ventilsteuerung für einen Zweiventilmotor (ein Einlaß- und ein Auslaßventil) dargestellt. Ein Hubhebel 4 ist mit der Rolle 30 in einer Kulisse 5 verschieblich und drehbar gelagert. Der Hubhebel wird durch die Leiste 8 und die Rückstellfeder 14 in der Kulisse verschoben. Die Kulisse 5 und die Lagerung bzw. Führung der Leiste 8 ist in einem Deckel 11 des Motors integriert, der genau ausgerichtet auf dem Zylinderkopf 13 oder einem Zwischenträger 12 montiert ist. Der Fachmann versteht, daß der Hubhebel 4 durch die Leiste 8 und die Rückstellfeder 14 auch in einer bestimmten Position innerhalb der Kulisse gehalten werden kann. Die Leiste 8 erstreckt sich senkrecht zur Papierebene entlang aller in dem Motor vorhandener Zylinder bzw. deren Einlaßventil, die in einer Reihe angeordnet sind. Die Position der Leiste 8 wird durch einen Wegsensor (nicht dargestellt) oder beispielsweise durch die Umdrehungen eines Elektromotors, der die Leiste antreibt erfaßt und einem elektronischen Steuergerät als Istwert übermittelt. Dieses Steuergerät regelt die gewünschte Stellung des Einlaßventils anhand eines Soll/Istwert-Vergleichs.In Figure 1a , the valve control according to the invention for a two-valve engine (an intake and an exhaust valve) is shown. A lever 4 is slidably and rotatably mounted in a link 5 with the roller 30. The lifting lever is moved by the bar 8 and the return spring 14 in the backdrop. The backdrop 5 and the mounting or guidance of the strip 8 are integrated in a cover 11 of the engine, which is mounted on the cylinder head 13 or an intermediate support 12 in a precisely aligned manner. The person skilled in the art understands that the lifting lever 4 can also be held in a specific position within the setting by the strip 8 and the return spring 14. The strip 8 extends perpendicular to the plane of the paper along all of the cylinders or their intake valve which are arranged in a row in the engine. The position of the bar 8 is detected by a displacement sensor (not shown) or, for example, by the revolutions of an electric motor that drives the bar and transmitted to an electronic control unit as the actual value. This control unit regulates the desired position of the intake valve on the basis of a target / actual value comparison.

Desweiteren verfügt der Hubhebel 4 über eine weitere Rolle 31, die mit der Nockenwelle 28 zusammenwirkt und die den Hubhebel 4 antreibt.Furthermore, the lifting lever 4 has a further roller 31, which is connected to the camshaft 28 cooperates and which drives the lifting lever 4.

Im unteren Teil weist der Hubhebel 4 eine Arbeitskurve 6 auf. Diese Arbeitskurve steht in Kontakt mit der Rolle 7, die an dem Rollenschlepphebel 1 angebracht ist. Der Rollenschlepphebel 1 wiederum bewegt das Ventil 3 (teilweise dargestellt).In the lower part, the lifting lever 4 has a working curve 6. This work curve is in contact with the roller 7, which is attached to the roller rocker arm 1. The Roller rocker arm 1 in turn moves the valve 3 (partially shown).

Der linke Teil der Arbeitskurve ist bevorlugt ein Kreis um den Rollenmittelpunkt der Rolle 30. Damit wird ein Nullhub in der dargestellten Stellung gewährleistet.The left part of the working curve is a circle around the center of the role Roll 30. This ensures a zero stroke in the position shown.

Der Übergang vom linken (Nullhubbereich) in den rechten (Hubbereich) der Arbeitskurve definiert die Beschleunigungsrampe der Einlaßventilbewegung. Die Beschleunigungsrampe der Nockenwelle 28 dient nur mehr zur Beschleunigung des Hubhebels 4 und wirkt nicht mehr auf die Ventilbeschleunigung.The transition from the left (zero stroke range) to the right (stroke range) of the Working curve defines the acceleration ramp of the intake valve movement. The acceleration ramp of the camshaft 28 is only used for acceleration of the lifting lever 4 and no longer acts on the valve acceleration.

Wird z. B. ein Verbrennungsmotor in Teillast betrieben, wird der Hubhebel 4 in der Kulisse 5 so verschoben, daß der Rollenschlepphebel 1 mit dem linken Teil der Arbeitskurve 6 zusammenwirkt, so daß der Hub des Ventils 3 reduziert ist. Bei Volllast hingegen wird der Hubhebel 4 in der Kulisse 5 so verschoben, daß der rechte Teil der Arbeitskurve 6 mit dem Rollenschlepphebel 1 in Kontakt steht, so daß der Hub des Ventils 3 maximal ist. Is z. B. operated an internal combustion engine in partial load, the lifting lever 4 is in the Backdrop 5 moved so that the rocker arm 1 with the left part of the Working curve 6 interacts so that the stroke of the valve 3 is reduced. At full load however, the lifting lever 4 is shifted in the setting 5 so that the right Part of the working curve 6 is in contact with the roller rocker arm 1 so that the Stroke of valve 3 is maximum.

Figur 1b zeigt den Ausschnitt eines Vierventilmotors (zwei Einlaß- und zwei Auslaßventile). In diesem Fall weist der Motor pro Zylinder zwei Einlaßventile auf, deren Hubverhalten durch die beiden Hubhebel 4a, 4b unabhängig voneinander geregelt wird, wobei nur der Hubhebel 4a dargestellt ist. Bei diesem Beispiel kann die Leiste 8 zweigeteilt, was durch die Leisten 15, 16 dargestellt ist. Die Leisten 15, 16 werden unabhängig voneinander angetrieben. Mit dieser Anordnung können die Ventilhübe der beiden Einlaßventile unabhängig voneinander geregelt werden. Es kann z.B. ein Einlaßventil auf den 0-Hub gestellt werden und nur der Ventilhub des anderen Ventils zur Drehmomentenregelung eingesetzt werden. Auch bei dieser Ausführungsform wird die Position der jeweiligen Leiste 15, 16 erfaßt und zur Regelung eingesetzt. Auch die Leisten 15, 16, erstrecken sich über alle Zylinder, die in einer Reihe angeordnet sind bzw. deren Ventile, deren Hub die jeweilige Leiste verändert. Figure 1b shows the detail of a four-valve engine (two intake and two exhaust valves). In this case, the engine has two intake valves per cylinder, the stroke behavior of which is regulated independently of one another by the two lift levers 4a, 4b, only the lift lever 4a being shown. In this example, the strip 8 can be divided into two, which is represented by the strips 15, 16. The strips 15, 16 are driven independently of one another. With this arrangement, the valve strokes of the two intake valves can be controlled independently of each other. For example, an inlet valve can be set to the 0 stroke and only the valve stroke of the other valve can be used for torque control. In this embodiment, the position of the respective bar 15, 16 is detected and used for control. The strips 15, 16 also extend over all cylinders which are arranged in a row or their valves, the stroke of which changes the respective strip.

Abbildung 2 zeigt eine weitere Ausführungsform der Lagerung der Hubhebel 4a, 4b bei einem Vierventilzylinder. In diesem Fall sind die beiden Hubhebel 4a, 4b auf einer gemeinsamen Achse 17 drehfest gelagert. Die Achse 17 wiederum ist in einem Wälzlager 18 drehbar gelagert. Das Wälzlager 18 kann entlang der Kulisse 5 von der Leiste 8 verschoben werden. Die Leiste 8 ist nicht zweigeteilt. Figure 2 shows a further embodiment of the mounting of the lifting levers 4a, 4b in a four-valve cylinder. In this case, the two lifting levers 4a, 4b are rotatably mounted on a common axis 17. The axis 17 in turn is rotatably supported in a roller bearing 18. The roller bearing 18 can be moved along the backdrop 5 by the bar 8. The bar 8 is not divided into two.

Die Achse 17 kann sich auch über alle Zylinder erstrecken, so daß alle Hubhebel auf einer Achse aufgereiht sind und z. B. durch Abstandshülsen in der Ventilposition gehalten werden.The axis 17 can also extend over all cylinders, so that all lifting levers on are lined up one axis and z. B. by spacer sleeves in the valve position being held.

Abbildung 3 zeigt eine mögliche Antriebsform der Leisten 8 bzw. der Leisten 15, 16, die bei dem vorliegenden Beispiel als Parallelogramm, das durch die Leisten 8 und 19 und die beiden Hebel 21 gebildet wird. Im folgenden wird nur noch auf die Leisten 8 und 19 Bezug genommen wird. Die Leisten 8 und 19 und die Hebel 21 sind in der Papierebene drehbar miteinander verbunden, wobei bei einem Vierzylindermotor mindestens zwei und bei einem Sechszylindermotor auch drei oder mehrere Hebel 21 eingesetzt werden. Die Leiste 19 ist mittels Lagern entlang der Horizontalen in beide Richtungen verschieblich gelagert, was durch den Doppelpfeil 20 angedeutet ist. Die Lager 22, die sich im Zylinderkopf befinden, können Gleit- oder Wälzlager sein. Die Leiste 8 wird durch die Lager 23 im Zylinderkopf entlang einer Vertikalen geführt und ihre Position kann durch Wegsensoren ermittelt werden. Die Leiste 19 wird über einen Motor 24 und über ein Schraubengewinde verstellt. In diesem Fall kann die Position der Leiste 8 und damit der eingestellte Hub des Einlaßventils durch einen Wegsensor 25, der die Position der Leiste 19 erfaßt, gemessen werden. Ebenso kann die Position der Leiste 8 durch die Erfassung der Motorumdrehungen gemessen werden. Der Fachmann erkennt, das viele andere Mittel beispielsweise eine Hydraulik, ein Hubmagnet, ein Schrittmotor, ein mechanisch betätigter Hebel oder ein Seilzug geeignet sind, die Verstellung der Leiste 19 zu bewerkstelligen. Die horizontale Bewegung 20 der Leiste 19 wird durch die Federn 24 und 25 unterstützt. Figure 3 shows a possible drive form of the strips 8 or strips 15, 16, which in the present example is a parallelogram formed by the strips 8 and 19 and the two levers 21. In the following, reference will only be made to strips 8 and 19. The strips 8 and 19 and the levers 21 are rotatably connected to one another in the plane of the paper, with at least two levers being used in a four-cylinder engine and three or more levers 21 being used in a six-cylinder engine. The bar 19 is mounted so that it can be displaced in both directions along the horizontal, which is indicated by the double arrow 20. The bearings 22, which are located in the cylinder head, can be plain or roller bearings. The strip 8 is guided through the bearings 23 in the cylinder head along a vertical line and its position can be determined by displacement sensors. The bar 19 is adjusted by a motor 24 and a screw thread. In this case, the position of the bar 8 and thus the set stroke of the inlet valve can be measured by a displacement sensor 25, which detects the position of the bar 19. The position of the strip 8 can also be measured by detecting the engine revolutions. Those skilled in the art will recognize that many other means, for example a hydraulic system, a lifting magnet, a stepping motor, a mechanically operated lever or a cable pull, are suitable for bringing about the adjustment of the bar 19. The horizontal movement 20 of the bar 19 is supported by the springs 24 and 25.

Figur 4 zeigt den Antrieb der Leiste 8 durch mindestens zwei Aktuatoren 27. Diese Aktuatoren können beispielsweise Hubmagneten, Elektromotoren mit oder ohne Getriebe, Piezomotoren bzw. mechanische, hydraulische oder pneumatische Mittel sein. FIG. 4 shows the drive of the strip 8 by at least two actuators 27. These actuators can be, for example, lifting magnets, electric motors with or without a gear, piezomotors or mechanical, hydraulic or pneumatic means.

Figur 5 zeigt zusätzlich zu Figur 4 noch eine Kraftwaage 32, die mit den Aktuatoren 27 zusammenwirkt. Durch diese Anordnung wird die Genauigkeit des Leerlaufventilhubes erhöht. In addition to FIG. 4, FIG. 5 also shows a force balance 32 which interacts with the actuators 27. This arrangement increases the accuracy of the idle valve stroke.

Claims (8)

  1. Mechanically controllable valve lift adjustment system for an internal combustion engine which comprises a plurality of cylinders, with:
    at least one lifting lever (4) per cylinder which comprises
    a means (30) by which the lifting lever (4) is mounted so as to be rotatable and displaceable in a link (5),
    a means (31), which co-operates with a camshaft (28) driving the lifting lever (4), and
    an operating cam (6),
    a means (8) which co-operates with the means (30) of the lifting lever (4) and displaces these in the links (5),
    a camshaft (28) which co-operates with the means (31) of the lifting lever (4) and drives this,
    at least one valve per cylinder, which valve co-operates with the operating cam (6) of each respective lifting lever (4) and is moved by this,
    characterised in that the means (8) is a driven rail which is mounted so as to be displaceable in the housing (11, 12) of the internal combustion engine.
  2. Mechanically controllable valve lift adjustment system for an internal combustion engine which comprises a plurality of cylinders, with:
    at least one lifting lever (4) per cylinder which comprises
    a means (30) by which the lifting lever (4) is mounted so as to be rotatable and displaceable in a link (5),
    a means (31), which co-operates with a camshaft (28) driving the lifting lever (4), and
    an operating cam (6),
    a means (8) which co-operates with the means (30) of the lifting lever (4) and displaces these in the links (5),
    a camshaft (28) which co-operates with the means (31) of the lifting lever (4) and drives this,
    a roller drag lever (1) which co-operates with the operating cam (6) of the lifting lever (4) and is driven by this,
    at least one valve per cylinder, which valve co-operates with the operating cam (6) of each respective lifting lever (4) and is moved by this,
    characterised in that the means (8) is a driven rail which is mounted so as to be displaceable in the housing (11, 12) of the internal combustion engine.
  3. Mechanically controllable valve lift adjustment system according to claim 1 or 2, characterised in that two lifting levers (4) are associated with one cylinder, which levers are displaced together by one rail (8) or independently of one another by two rails (15, 16).
  4. Mechanically controllable valve lift adjustment system according to any one of claims 1 to 3, characterised in that the position of the rail (8, 15, 16, 19) is detected and this position is set as the actual value for controlling the valve lift.
  5. Mechanically controllable valve lift adjustment system according to any one of claims 1 to 4, characterised in that the rail (8, 15, 16) is driven by a parallelogram.
  6. Mechanically controllable valve lift adjustment system according to any one of claims 1 to 5, characterised in that the valve is an intake valve of an internal combustion engine.
  7. Internal combustion engine, characterised in that it comprises at least one mechanically controllable valve lift adjustment system according to any one of claims 1 to 6.
  8. Method for controlling the lift of an intake valve of an internal combustion engine using a mechanically controllable valve lift adjustment system according to any one of claims 1 to 6, characterised in that at least two lifting levers (4) are displaced in the link (5) by way of a driven rail (8, 15, 16) according to the power requirement to be met by the internal combustion engine.
EP01110782A 2001-05-03 2001-05-03 Mechanic control of variable lift of an intake valve of an internal combustion engine Expired - Lifetime EP1255027B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ES01110782T ES2185519T3 (en) 2001-05-03 2001-05-03 MECHANICAL REGULATION OF THE RUNNING VALVE OF A COMBUSTION ENGINE.
AT01110782T ATE272787T1 (en) 2001-05-03 2001-05-03 MECHANICAL CONTROL OF THE STROKE ADJUSTMENT OF THE INLET VALVE OF AN INTERNAL COMBUSTION ENGINE
DE50103100T DE50103100D1 (en) 2001-05-03 2001-05-03 Mechanical regulation of the stroke adjustment of the intake valve of an internal combustion engine
EP01110782A EP1255027B1 (en) 2001-05-03 2001-05-03 Mechanic control of variable lift of an intake valve of an internal combustion engine
US10/137,971 US6792903B2 (en) 2001-05-03 2002-05-03 Mechanical control of the intake valve lift adjustment in an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01110782A EP1255027B1 (en) 2001-05-03 2001-05-03 Mechanic control of variable lift of an intake valve of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP1255027A1 EP1255027A1 (en) 2002-11-06
EP1255027B1 true EP1255027B1 (en) 2004-08-04

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EP01110782A Expired - Lifetime EP1255027B1 (en) 2001-05-03 2001-05-03 Mechanic control of variable lift of an intake valve of an internal combustion engine

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US (1) US6792903B2 (en)
EP (1) EP1255027B1 (en)
AT (1) ATE272787T1 (en)
DE (1) DE50103100D1 (en)
ES (1) ES2185519T3 (en)

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Also Published As

Publication number Publication date
ES2185519T1 (en) 2003-05-01
US6792903B2 (en) 2004-09-21
ES2185519T3 (en) 2005-03-16
EP1255027A1 (en) 2002-11-06
US20020162522A1 (en) 2002-11-07
DE50103100D1 (en) 2004-09-09
ATE272787T1 (en) 2004-08-15

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