EP1649148B1 - Control device for a valve, particularly a gas exchange valve of an internal combustion engine - Google Patents
Control device for a valve, particularly a gas exchange valve of an internal combustion engine Download PDFInfo
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- EP1649148B1 EP1649148B1 EP05766972A EP05766972A EP1649148B1 EP 1649148 B1 EP1649148 B1 EP 1649148B1 EP 05766972 A EP05766972 A EP 05766972A EP 05766972 A EP05766972 A EP 05766972A EP 1649148 B1 EP1649148 B1 EP 1649148B1
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- control unit
- valve
- cam profiles
- unit according
- valve displacement
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- 230000033001 locomotion Effects 0.000 claims abstract description 10
- 238000006073 displacement reaction Methods 0.000 claims abstract 23
- 230000010363 phase shift Effects 0.000 claims description 12
- 238000004064 recycling Methods 0.000 claims 2
- 238000009841 combustion method Methods 0.000 claims 1
- 230000000295 complement effect Effects 0.000 claims 1
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Classifications
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- 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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/08—Shape of cams
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- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
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- 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
- F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
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- 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
- F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
- F01L13/0047—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction the movement of the valves resulting from the sum of the simultaneous actions of at least two cams, the cams being independently variable in phase in respect of each other
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- 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
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
-
- 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
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- the invention relates to a control device for actuating at least one valve, in particular a gas exchange valve of an internal combustion engine, wherein the valve lift of the at least one valve by overlapping at least two synchronously rotating, mechanically acting on a Hubbetuschistselement cam profiles, namely a first cam profile and a second cam profile generated and can be changed by phase shift between these two cam profiles.
- a valve control unit in which an additional valve lift curve can be generated by using two separately rotating cam profiles that are phase-shiftable in rotation to form a main valve lift curve.
- this mechanical control device no variability of the main valve lift curve is possible.
- the additional valve lift curve is predetermined by the geometry of the camshaft and can not be made infinitely variable.
- the additional valve lift is generated there by a cam profile, which has no contact with the Hubbetuschistselement during the main valve lift of a valve and can protrude from the action area in a base circle region of the main valve lift curve generating cam profile.
- hydraulically / mechanically operating combination devices are known from, for example, WO 00/31385. With those devices, it is possible to produce various additional valve lift curves to a main valve lift curve.
- This combined mechanical / hydraulic device has an extremely complicated structure with a variety of functional elements and a high susceptibility associated with it.
- the invention deals with the problem, the control device according to the above-mentioned earlier patent application PCT / DE 2004/000079 to form a device with at least the possibilities of the mechanical / hydraulic control device according to WO 00/31385.
- the inventively to be created device should be used for example for the braking operation of an internal combustion engine of a motor vehicle and also in a vehicle internal combustion engine for an internal engine charging by fresh air or exhaust gas or to display new combustion processes and for internal exhaust gas recirculation in turn the aforementioned internal combustion engines.
- a valve controller must be able to produce certain auxiliary valve lifts for one main valve lift with respect to a full revolution of a cam profile.
- the invention is based on the general idea, in a control device in which the lifting movement of a valve is generated by a Hubbetuschistselement act on the at least two synchronously rotating cam profiles together for a superposition of the cam profile curves, the cam profiles so with itself on the Hubbetuschistor respect to provide motion overlapping profile curves that each cam profile rotation in addition to a decisive for the stroke main valve lift curve additional valve lift curves of any shape and assignment to each other and opposite the main survey curve can be generated. This makes it possible, starting from desired valve lift curves to generate corresponding cam profile shapes and that by appropriate, conventional computational generation methods.
- Valve control device according to FIG. 1:
- Two synchronously rotating and mutually phase-adjustable camshaft having a first and second cam profile 1 and 2 actuate a designed as a lever with two contact rollers intermediate element in the form of a Hubbetuschists institutes 4, which transmits the resulting adjustment path via a bearing axis on a power transmission lever 5, the via a clearance compensation device 9 actuates a valve.
- the lever 5 is pressed with the valve 6 closed against a stop 8.
- a spring 7 ensures that the Hubbetuschistorselement 4 is always applied via a contact roller on the cam profile 1.
- the phase angle of the two cam profiles 1 and 2 is mutually variable.
- valve movements achievable with the shapes of the cam profiles 1 and 2 shown in FIGS. 2 b and 2 c are explained on the basis of the illustrations in FIGS. 2 a to 4 a.
- Fig. 2b and Fig. 2c show the two synchronously rotating cam profiles 1 and 2 in cross section.
- cam profiles 1, 2 have a basic shape for the generation of a valve lifting movement after a main valve lift curve and a superimposed shape for the generation of an additional stroke movement after an additional valve lift curve.
- additional forms in the cam profiles 1 and 2 are in Fig. 2b in the first cam profile 1 with 1 'and in Fig. 2c in the second cam profile 2 with
- cam profiles 1 and 2 are shown together for a cam profile rotation in Fig. 2d and correspondingly denoted by 1 and 2 at a phase position P 0 of the cam profiles as indicated in Fig. 2c.
- valve lift curve which consists of a main valve lift curve HV and an additional valve lift curve ZV.
- Fig. 2c two further phase positions P1 and P2 of the cam profile 2 are shown, as they are necessary for the Fig. 3 and Fig. 4.
- phase adjustment between the two cam profiles 1 and 2 is here only by way of example by the rotation of the second cam profile 2 with respect to the first cam profile. 1 shown and can of course be realized in the same direction or in opposite directions by the same or different adjustment angle by rotation of the first cam profile 1 relative to the second cam profile 2 or by rotation of both cam profiles. Any other adjustment not mentioned here should be applicable to a control device according to the invention.
- the main valve lift is generated by - in this example - the cam lift of the first cam profile 1 and the maximum stroke range of the cam profile 2.
- a phase angle of the two cam profiles 1, 2 to each other which is indicated in Fig. 2c by the position P 1 of the second cam profile 2 and base for Fig. 2c. 3 forms, the positive elevation 1 'of the first cam profile and the negative inwardly directed recess 2' in the second cam profile 2 by overlay, as can be seen from Fig. 3a.
- cam profile shapes of the two cam profiles 1, 2 are shown in which, taking into account a total of three different phase positions of the two cam profiles 1, 2 to each other, the three valve lift curves shown in Fig. 5a result, that is, a main valve lift curve HV and two Additional valve lift curves ZV.
- the profile curves of the cam profiles 1 and 2 in Fig. 5d arise from the corresponding cam profile shapes of Fig. 5b and Fig. 5c.
- FIGS. 6, 7 and 8 are constructed in the same way as the representation in FIG. 5 and differ from FIG. 5 only by different shapes of the cam profiles 1, 2 and resulting different valve lift curves in FIGS. 6 a, 7 a and Fig. 8a.
- the main valve lift curve is generated by the increasing cam lift of the first cam profile and the decreasing cam lift of the second cam profile 2.
- the additional valve lift is generated here by the decreasing cam lift of the first cam profile 1 and the increasing cam lift of the second cam profile 2.
- the type of generation of the valve lift curves by the two cam profiles 1, 2 described with reference to the examples according to FIGS. 6 and 8 is particularly advantageous. This means that in principle the increasing and decreasing cam profile areas of the two cam profiles 1 and 2 can be used to produce the main valve lift curve and in particular also should.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Die Erfindung betrifft eine Steuereinrichtung zur Betätigung mindestens eines Ventiles, insbesondere eines Gaswechselventiles eines Verbrennungsmotors, bei der die Ventilhubbewegung des mindestens einen Ventiles durch eine Überlagerung mindestens zweier synchron drehender, mechanisch auf ein Hubbetätigungselement einwirkender Nockenprofile, nämlich eines ersten Nockenprofiles und eines zweiten Nockenprofiles erzeugt und durch Phasenverschiebung zwischen diesen beiden Nockenprofilen verändert werden kann.The invention relates to a control device for actuating at least one valve, in particular a gas exchange valve of an internal combustion engine, wherein the valve lift of the at least one valve by overlapping at least two synchronously rotating, mechanically acting on a Hubbetätigungselement cam profiles, namely a first cam profile and a second cam profile generated and can be changed by phase shift between these two cam profiles.
Eine solche Einrichtung ist in der älteren Patentanmeldung PCT/DE 2004/000079 beschrieben. Mit den dort eingesetzten Nockenprofilen ist es allerdings lediglich möglich, eine Ventilhubbewegung mit nur einer einzigen Ventilerhebungskurve zu erzeugen und diese in Form und Verlauf nahezu beliebig durch entsprechende Profilformen und gegenseitiges Phasenverschieben der beiden auf ein gemeinsames Hubbetätigungselement einwirkenden Nockenprofile zu variieren.Such a device is described in the earlier patent application PCT / DE 2004/000079. With the cam profiles used there, however, it is only possible to produce a valve lift with only a single valve lift curve and to vary these in shape and shape almost arbitrarily by corresponding profile shapes and mutual phase shifting of the two acting on a common Hubbetätigungselement cam profiles.
Aus DE 197 33 322 A1 ist eine Ventil-Steuereinheit bekannt, bei der durch die Verwendung zweier getrennt rotierender und in der Rotation phasenverschiebbarer Nockenprofile zu einer Haupt-Ventilerhebungskurve auch eine Zusatz-Ventilerhebungskurve erzeugbar ist. Bei dieser mechanisch arbeitenden Steuereinrichtung ist keine Veränderbarkeit der Haupt-Ventilerhebungskurve möglich. Gleichzeitig ist die Zusatz-Ventilerhebungskurve durch die Geometrie der Nockenwelle vorgegeben und kann nicht stufenlos variabel gestaltet werden. Die Zusatz-Ventilerhebung wird dort durch ein Nockenprofil erzeugt, das während der Haupt-Ventilerhebung eines Ventils keinen Kontakt zu dem Hubbetätigungselement besitzt und erst in einem Grundkreisbereich des die Haupt-Ventilerhebungskurve erzeugenden Nockenprofiles aus dessen Aktionsbereich herausragen kann.From DE 197 33 322 A1, a valve control unit is known, in which an additional valve lift curve can be generated by using two separately rotating cam profiles that are phase-shiftable in rotation to form a main valve lift curve. In this mechanical control device, no variability of the main valve lift curve is possible. At the same time, the additional valve lift curve is predetermined by the geometry of the camshaft and can not be made infinitely variable. The additional valve lift is generated there by a cam profile, which has no contact with the Hubbetätigungselement during the main valve lift of a valve and can protrude from the action area in a base circle region of the main valve lift curve generating cam profile.
Um Zusatz-Ventilerhebungen neben einer Ventil-Haupterhebung erzielen zu können, sind hydraulisch/mechanisch arbeitende Kombinationseinrichtungen aus beispielsweise WO 00/31385 bekannt. Mit jenen Einrichtungen ist es möglich, verschiedenartige Zusatz-Ventilerhebungskurven zu einer Haupt-Ventilerhebungskurve zu erzeugen. Jene kombiniert mechanisch/hydraulisch arbeitende Einrichtung besitzt einen äußerst komplizierten Aufbau mit einer Vielzahl an Funktionselementen und einer damit verbundenen hohen Störanfälligkeit.In order to be able to achieve additional valve lifts in addition to a main valve lift, hydraulically / mechanically operating combination devices are known from, for example, WO 00/31385. With those devices, it is possible to produce various additional valve lift curves to a main valve lift curve. This combined mechanical / hydraulic device has an extremely complicated structure with a variety of functional elements and a high susceptibility associated with it.
Die Erfindung beschäftigt sich mit dem Problem, die Steuereinrichtung nach der eingangs erwähnten älteren Patentanmeldung PCT/DE 2004/000079 zu einer Einrichtung mit mindestens den Möglichkeiten der mechanisch/hydraulisch arbeitenden Steuereinrichtung nach WO 00/31385 auszubilden. Die erfindungsgemäß zu schaffende Einrichtung soll beispielsweise einsetzbar sein für den Bremsbetrieb eines Verbrennungsmotors eines Kraftfahrzeuges sowie ebenfalls bei einem Fahrzeug-Verbrennungsmotor für eine interne Motoraufladung durch Frischluft oder Abgas oder zur Darstellung neuer Brennverfahren sowie für eine interne Abgasrückführung bei wiederum den vorgenannten Verbrennungsmotoren. In all diesen Anwendungsbereichen muss eine Ventilsteuereinrichtung dazu in der Lage sein, zu einem Haupt-Ventilhub mit Bezug auf eine volle Umdrehung eines Nockenprofiles bestimmte Zusatzventilerhebungen erzeugen zu können.The invention deals with the problem, the control device according to the above-mentioned earlier patent application PCT / DE 2004/000079 to form a device with at least the possibilities of the mechanical / hydraulic control device according to WO 00/31385. The inventively to be created device should be used for example for the braking operation of an internal combustion engine of a motor vehicle and also in a vehicle internal combustion engine for an internal engine charging by fresh air or exhaust gas or to display new combustion processes and for internal exhaust gas recirculation in turn the aforementioned internal combustion engines. In all of these applications, a valve controller must be able to produce certain auxiliary valve lifts for one main valve lift with respect to a full revolution of a cam profile.
Gelöst wird dieses Problem durch eine Steuereinrichtung mit sämtlichen Merkmalen des Patentanspruchs.This problem is solved by a control device having all the features of the patent claim.
Die Erfindung beruht auf dem allgemeinen Gedanken, bei einer Steuereinrichtung, bei der die Hubbewegung eines Ventils durch ein Hubbetätigungselement erzeugt wird, auf das mindestens zwei synchron zueinander drehende Nockenprofile gemeinsam für eine Überlagerung der Nockenprofilkurven einwirken, die Nockenprofile derart mit sich an dem Hubbetätigungselement bezüglich dessen Bewegung überlagernden Profilkurven zu versehen, dass je Nockenprofilumdrehung neben einer für die Hubbewegung maßgebenden Haupt-Ventilerhebungskurve zusätzliche Ventilerhebungskurven beliebiger Form sowie Zuordnung untereinander und gegenüber der Haupterhebungskurve generierbar sind. Damit ist es möglich, ausgehend von gewünschten Ventilerhebungskurven entsprechende Nockenprofilformen zu generieren und zwar durch entsprechende, übliche rechnerische Generierungsverfahren.The invention is based on the general idea, in a control device in which the lifting movement of a valve is generated by a Hubbetätigungselement act on the at least two synchronously rotating cam profiles together for a superposition of the cam profile curves, the cam profiles so with itself on the Hubbetätigungselement respect To provide motion overlapping profile curves that each cam profile rotation in addition to a decisive for the stroke main valve lift curve additional valve lift curves of any shape and assignment to each other and opposite the main survey curve can be generated. This makes it possible, starting from desired valve lift curves to generate corresponding cam profile shapes and that by appropriate, conventional computational generation methods.
Beispiele hierzu, an denen die Erfindung noch näher erläutert wird, werden nachstehend anhand gezeichneter Ausführungsbeispiele erläutert.Examples on which the invention will be explained in more detail will be explained below with reference to drawn embodiments.
In der Zeichnung zeigen:
- Fig. 1
- ein Beispiel einer zur Durchführung der Erfindung geeigneten Steuereinrichtung,
- Fig. 2
- zwei synchron drehende, zur gemeinsamen Betätigung eines Hubbetätigungselementes bestimmte Nockenprofile (Teil b, Teil c) mit einer Darstellung der sich an dem Hubbetätigungselement überlagernden Profilkurven dieser beiden Nockenprofile (Teil d) in einer Phasenstellung P0 sowie der durch diese Nockenprofile mit Bezug auf die Ventilhubbewegung erzielbaren Ventilerhebungskurve mit einer Haupt-Ventilerhebungskurve(HV) und einer Zusatz-Ventilerhebungskurve (ZV) (Teil a),
- Fig. 3
- eine aus der Fig. 2 abgeleitete gleiche Darstellung für gegeneinander phasenverschobene Nockenprofile bei einer ersten Phasenverschiebung um einen Wert P1,
- Fig. 4
- eine aus der Fig. 2 abgeleitete gleiche Darstellung für gegeneinander phasenverschobene Nockenprofile bei einer zweiten Phasenverschiebung um einen Wert P2,
- Fig. 5
- eine Darstellung wie in den Fig. 2 bis 4 für andersartig geformte Nockenprofile mit jeweils in der gleichen Zeichnung dargestellten unterschiedlichen Phasenverschiebungspositionen zwischen den beiden Nockenprofilen,
- Fig. 6
- eine mit der Fig. 5 übereinstimmende Darstellungsweise für anders geformte Nockenprofile,
- Fig. 7
- eine mit den Fig. 5, 6 übereinstimmende Darstellungsweise für weitere unterschiedliche Nockenprofilformen.
- Fig. 8
- eine mit den Fig. 5, 6 und 7 übereinstimmende Darstellungsweise für weitere unterschiedliche Nockenprofilformen.
- Fig. 1
- an example of a control device suitable for carrying out the invention,
- Fig. 2
- two synchronously rotating, for common actuation of a Hubbetätigungselementes certain cam profiles (Part b, Part c) with a representation of the Hubbetätigungselement overlying profile curves of these two cam profiles (Part d) in a phase position P 0 and by these cam profiles with respect to the valve lift achievable valve lift curve with a main valve lift curve (HV) and an additional valve lift curve (ZV) (part a),
- Fig. 3
- a derived from Fig. 2 same representation for mutually phase-shifted cam profiles at a first phase shift by a value P1,
- Fig. 4
- a derived from FIG. 2 the same representation for mutually phase-shifted cam profiles in a second phase shift by a value P2,
- Fig. 5
- 2 shows an illustration as in FIGS. 2 to 4 for differently shaped cam profiles, each with different phase shift positions between the two cam profiles shown in the same drawing;
- Fig. 6
- FIG. 5 shows a representation of differently shaped cam profiles in accordance with FIG. 5;
- Fig. 7
- a with Figs. 5, 6 matching representation for other different cam profile shapes.
- Fig. 8
- a with Figs. 5, 6 and 7 matching representation for other different cam profile shapes.
Zwei synchron drehende und gegeneinander phasenverstellbare Nockenwellen mit einem ersten und zweiten Nockenprofil 1 bzw. 2 betätigen ein als einen Hebel mit zwei Kontaktrollen gestaltetes Zwischenelement in der Form eines Hubbetätigungselementes 4, welches den resultierenden Verstellweg über eine Lagerachse auf einen Kraftübertragungs-Hebel 5 überträgt, der über eine Spielausgleichsvorrichtung 9 ein Ventil betätigt. Durch die Kraft der Spielausgleichsvorrichtung 9 wird der Hebel 5 bei geschlossenem Ventil 6 gegen einen Anschlag 8 gedrückt. Eine Feder 7 stellt sicher, dass das Hubbetätigungselement 4 immer über eine Kontaktrolle am Nockenprofil 1 anliegt. Die Phasenlage der beiden Nockenprofile 1 und 2 ist gegeneinander veränderbar.Two synchronously rotating and mutually phase-adjustable camshaft having a first and
Die mit den in Fig. 2b und Fig. 2c gezeichneten Formen der Nockenprofile 1 und 2 erreichbaren Ventilbewegungen werden anhand der Darstellungen in den Fig. 2a bis Fig. 4a erläutert.The valve movements achievable with the shapes of the
Fig. 2b und Fig. 2c zeigen die beiden synchron drehenden Nockenprofile 1 und 2 im Querschnitt.Fig. 2b and Fig. 2c show the two synchronously rotating
Diese beiden Nockenprofile 1, 2 besitzen eine Grundform für die Erzeugung einer Ventil-Hubbewegung nach einer Haupt-Ventilerhebungskurve und eine überlagerte Form für die Erzeugung einer Zusatz-Hubbewegung nach einer Zusatz-Ventilerhebungskurve. Diese Zusatzformen in den Nockenprofilen 1 und 2 sind in der Fig. 2b in dem ersten Nockenprofil 1 mit 1' und in der Fig. 2c in dem zweiten Nockenprofil 2 mitThese two
2' eingetragen. Diese beiden Nockenerhebungen 1', 2' sind für eine gegenseitige Überlagerung mit einer daraus resultierenden Beaufschlagung des Hubbetätigungselementes 4 nach beispielsweise Fig. 1 ausgelegt. Die Profilkurven der Nockenprofile 1 und 2 sind gemeinsam für eine Nockenprofilumdrehung in Fig. 2d wiedergegeben und entsprechend mit 1 und 2 bezeichnet bei einer Phasenstellung P0 der Nockenprofile entsprechend der Angabe in Fig. 2c.2 'registered. These two cam lobes 1 ', 2' are designed for a mutual overlap with a resulting action on the Hubbetätigungselementes 4 for example Fig. 1. The profile curves of the cam profiles 1 and 2 are shown together for a cam profile rotation in Fig. 2d and correspondingly denoted by 1 and 2 at a phase position P 0 of the cam profiles as indicated in Fig. 2c.
Die Überlagerung dieser beiden Nockenprofilverläufe erzeugt an dem zu betätigenden Ventil mit Bezug auf eine volle Umdrehung der Nockenprofile 1, 2 eine Ventilerhebungskurve, die sich zusammensetzt aus einer Haupt-Ventilerhebungskurve HV und einer Zusatz-Ventilerhebungskurve ZV.The superimposition of these two cam profile curves generated on the valve to be actuated with respect to a full revolution of the cam profiles 1, 2, a valve lift curve, which consists of a main valve lift curve HV and an additional valve lift curve ZV.
In Fig. 2c sind zwei weitere Phasenstellungen P1 und P2 des Nockenprofils 2 eingezeichnet, wie diese für die Fig. 3 und Fig. 4 notwendig sind.In Fig. 2c, two further phase positions P1 and P2 of the
Die Fig. 3 und 4 zeigen jeweils eine Phasenverschiebung zwischen den beiden Nockenprofilen 1 und 2 durch jeweils ausschließlich eine Verdrehung des zweiten Nockenprofiles 2 gegenüber dem ersten Nockenprofil 1, und zwar um den Phasenwinkel P1 in Fig.3 und den Phasenwinkel P2 in Fig. 4, durch die entsprechend den Darstellungen in den Fig. 3 und 4 unterschiedliche Zusatz-Ventilerhebungskurven ZV entstehen. Die Phasenverstellung zwischen den beiden Nockenprofilen 1 und 2 ist hier nur beispielhaft durch die Verdrehung des zweiten Nockenprofiles 2 gegenüber dem ersten Nockenprofil 1 dargestellt und kann selbstverständlich auch durch Verdrehung des ersten Nockenprofiles 1 gegenüber dem zweiten Nockenprofil 2 oder durch Verdrehung beider Nockenprofile gleichsinnig oder gegensinnig um gleiche oder unterschiedliche Verstellwinkel realisiert werden. Jede weitere hier nicht erwähnte Verstellmöglichkeit soll für eine erfindungsgemäße Steuereinrichtung anwendbar sein.3 and 4 each show a phase shift between the two
Bei den Nockenprofil-Formen nach den Fig. 2 bis 4 wird die Hauptventilerhebung durch - in diesem Beispiel - den Nockenhub des ersten Nockenprofiles 1 sowie den Maximalhubbereich des Nockenprofiles 2 generiert. Dabei ist die Hauptventilerhebung unabhängig von der Phasenlage des zweiten Nockenprofiles 2 gegenüber dem ersten Nockenprofil 1. Bei einer Phasenlage der beiden Nockenprofile 1, 2 zueinander, die in Fig. 2c durch die Stellung P1 des zweiten Nockenprofiles 2 angegeben ist und Basis für Fig. 3 bildet, heben sich die positive Erhebung 1' des ersten Nockenprofiles und die negativ nach innen gerichtete Ausnehmung 2' in dem zweiten Nockenprofil 2 durch Überlagerung auf, wie dies aus der Fig. 3a ersichtlich ist.In the cam profile shapes according to FIGS. 2 to 4, the main valve lift is generated by - in this example - the cam lift of the
Zu der Überlagerung der Nockenprofile, die jeweils die Ventilerhebungskurven ergeben, ist bezüglich der zeichnerischen Darstellung zu bemerken, dass jeweils zwischen den Darstellungen in den Teilen a bis d sowie zwischen den Profilkurven der Nockenprofile 1 und 2 keine maßstäbliche Übereinstimmung gegeben ist. Dies ergibt sich daraus, dass zwischen den bewegten Ventilen und den bewegungsauslösenden Nockenprofilen 1, 2 eine Übersetzung durch zwischengeschaltete Kraftübertragungselemente erfolgt. Die Darstellungen sollen nur den prinzipiellen Zusammenhang erläutern.With respect to the superimposition of the cam profiles, which respectively yield the valve lift curves, it should be noted with respect to the drawing that there is no true-to-scale agreement between the representations in parts a to d and between the profile curves of
In Fig. 5 sind Nockenprofilformen der beiden Nockenprofile 1, 2 dargestellt, bei denen sich unter Berücksichtigung von insgesamt drei unterschiedlichen Phasenstellungen der beiden Nockenprofile 1, 2 zueinander die in Fig. 5a gezeigten drei Ventilerhebungskurven ergeben, das heißt eine Haupt-Ventilerhebungskurve HV und zwei Zusatz-Ventilerhebungskurven ZV. Die Profilkurven der Nockenprofile 1 und 2 in Fig. 5d ergeben sich aus den entsprechenden Nockenprofilformen aus Fig. 5b und Fig. 5c.In Fig. 5 cam profile shapes of the two
Die Darstellungen in den Fig. 6, 7 und 8 sind in gleicher Weise aufgebaut wie die Darstellung in Fig. 5 und unterscheiden sich gegenüber Fig. 5 lediglich durch unterschiedliche Formen der Nockenprofile 1, 2 sowie daraus resultierender unterschiedlicher Ventilerhebungskurven in Fig. 6a, 7a und Fig. 8a.The illustrations in FIGS. 6, 7 and 8 are constructed in the same way as the representation in FIG. 5 and differ from FIG. 5 only by different shapes of the cam profiles 1, 2 and resulting different valve lift curves in FIGS. 6 a, 7 a and Fig. 8a.
Gegenüber den anderen Ventilerhebungskurven weisen diejenigen nach Fig. 6 und Fig. 8 bezüglich der Haupt-Ventilerhebungskurve HV dahingehend eine Besonderheit auf, dass hier auch diese Haupt-Ventilerhebungskurve HV durch entsprechende Nockenprofile 1, 2 und deren Phasenverschiebung gegeneinander verändert wird.With respect to the other valve lift curves, those of FIGS. 6 and 8 have a special feature with respect to the main valve lift curve HV in that here too this main valve lift curve HV is changed by corresponding
Zu den Nockenprofilformen in der Fig. 6 ist zu bemerken, dass hier die Haupt-Ventilerhebungskurve durch den zunehmenden Nockenhub des ersten Nockenprofiles und den abnehmenden Nockenhub des zweiten Nockenprofiles 2 generiert wird. Die Zusatz-Ventilerhebung wird hier durch den abnehmenden Nockenhub des ersten Nockenprofiles 1 und den zunehmenden Nockenhub des zweiten Nockenprofiles 2 generiert. Bei einer Veränderung der Phasenlage zwischen erstem und zweitem Nockenprofil 1, 2 verändert sich proportional mit der betreffenden Phasenverschiebung die Haupt-Ventilerhebung zusammen mit der zugehörigen Zusatz-Ventilerhebung.It should be noted with regard to the cam profile shapes in FIG. 6 that here the main valve lift curve is generated by the increasing cam lift of the first cam profile and the decreasing cam lift of the
Bei allen Ausführungen nach der vorliegenden Erfindung ist die mit Bezug auf die Beispiele nach Fig. 6 und Fig. 8 beschriebene Art der Generierung der Ventilerhebungskurven durch die beiden Nockenprofile 1, 2 besonders vorteilhaft. Dies bedeutet, dass zur Erzeugung der Haupt-Ventilerhebungskurve grundsätzlich die zu- und abnehmenden Nockenprofilbereiche der beiden Nockenprofile 1 und 2 herangezogen werden können und insbesondere auch sollen.In all embodiments according to the present invention, the type of generation of the valve lift curves by the two
Alle in der Beschreibung und in den nachfolgenden Ansprüchen dargestellten Merkmale können sowohl einzeln als auch in beliebiger Form miteinander erfindungswesentlich sein.All features shown in the description and in the following claims may be essential to the invention both individually and in any desired form.
Claims (14)
- A control unit for operating at least one valve, in particular a gas exchange valve (6) of an internal combustion engine in which- the valve lifting movement of the at least one valve (6) is variable by superimposing at least two synchronously rotating cam profiles which act on a lift operating element (4), namely generating a first came profile (1) and a second cam profile (2), and being variable by phase shift between these two cam profiles (1, 2),- both cam profiles (1, 2) have specially shaped areas which, when superimposed, generate at least one additional valve displacement (additional valve displacement curve ZV) are complementary to one of the two cam profiles (1, 2) over a full revolution of each of these cam profiles (1, 2), whereby at least this at least one additional valve displacement curve (ZV) is variable in shape and assignment to the main valve displacement curve (HV) by phase shift between the two cam profiles (1, 2).
- The control unit according to Claim 1, having a plurality of additional valve displacement curves (ZV),
characterized in that
the additional valve displacement curves (ZV) are variable in their assignment to one another by phase shift. - The control unit according to Claim 1 or 2,
characterized in that
the main valve displacement curve (HV) is also variable simultaneously with the additional valve displacement curve (ZV). - The control unit according to any one of the preceding claims,
characterized in that
the main valve displacement curve (HV) is variable in opposition to the additional valve displacement curve (ZV), i.e., when there is a reduction in the main valve displacement there is an increase in the additional valve displacement and vice versa. - The control unit according to Claim 1 or 2,
characterized in that
the additional valve displacement curve (ZV) can be varied while the main valve displacement curve (HV) remains unchanged. - The control unit according to any one of the preceding claims,
characterized in that
the additional valve displacement can be varied down to a zero displacement. - The control unit according to any one of Claims 1 through 5,
characterized in that
the additional valve displacement can be varied to a minimal displacement which does not yield an effective valve opening cross section that is for gas flow. - The control unit according to any one of the preceding claims,
characterized in that
the additional valve displacement can be varied by phase displacement between the two cam profiles (1, 2) down to a minimal lift or a zero lift and it recurs with a further phase shift in an altered phase relation (Figure 7). - The control unit according to any one of the preceding claims,
characterized in that
this unit is used at the intake and/or exhaust ends for internal exhaust recycling during engine operation. - The control unit according to any one of the preceding claims,
characterized in that
this unit is used at the exhaust end for decompression (engine braking operation) during operation of the engine. - The control unit according to any one of the preceding claims,
characterized in that
this unit is used for internal charging at the exhaust end during engine operation. - The control unit according to any one of the preceding claims,
characterized in that
this unit is used at the exhaust end and/or at the intake end to implement a new combustion method during engine operation. - The control unit according to any one of the preceding claims,
characterized in that
multiple additional valve displacement curves (ZV) can be generated as a function of the phase shift between the two cam profiles (1, 2) and can be varied in the same direction or in different directions. - The control unit according to any one of the preceding claims,
characterized in that
by means of this control unit, it is possible to switch between engine operation, engine operation with internal exhaust gas recycling and engine braking operation.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004034710 | 2004-07-17 | ||
PCT/DE2005/001218 WO2006007817A1 (en) | 2004-07-17 | 2005-07-12 | Control device for a valve, particularly a gas exchange valve of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
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EP1649148A1 EP1649148A1 (en) | 2006-04-26 |
EP1649148B1 true EP1649148B1 (en) | 2006-12-13 |
Family
ID=35134440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP05766972A Active EP1649148B1 (en) | 2004-07-17 | 2005-07-12 | Control device for a valve, particularly a gas exchange valve of an internal combustion engine |
Country Status (6)
Country | Link |
---|---|
US (1) | US7311072B2 (en) |
EP (1) | EP1649148B1 (en) |
JP (1) | JP2008506878A (en) |
CN (1) | CN1839250B (en) |
DE (2) | DE112005000030D2 (en) |
WO (1) | WO2006007817A1 (en) |
Families Citing this family (13)
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DE102006021933A1 (en) * | 2006-05-11 | 2007-11-15 | Schaeffler Kg | Drag lever system for use in cylinder head of internal combustion engine, has outer lever including side walls with supporting surfaces for respective opposing surfaces so that start-up unit of inner lever is held at distance to lifting cam |
GB2447466B (en) * | 2007-03-13 | 2011-11-16 | Mechadyne Plc | Variable valve actuation system for an internal combustion engine |
GB2449096A (en) * | 2007-05-10 | 2008-11-12 | Mechadyne Plc | Variable valve actuating system for i.c. engines |
GB2456760B (en) | 2008-01-22 | 2012-05-23 | Mechadyne Plc | Variable valve actuating mechanism with lift deactivation |
CN101581238B (en) * | 2008-05-13 | 2013-07-17 | 麦加戴恩公共有限公司 | Variable valve driving system for internal combustion engine |
WO2010096437A2 (en) | 2009-02-17 | 2010-08-26 | Cummins Inc. | Variable valve actuation apparatus, system, and method |
GB0920152D0 (en) * | 2009-11-18 | 2009-12-30 | Camcon Ltd | Rotary electromagnetic actuator |
US9765658B2 (en) | 2011-03-02 | 2017-09-19 | Delphi Technologies, Inc. | Valve train system for an internal combustion engine |
CN103422923B (en) * | 2013-08-27 | 2015-10-28 | 上海理工大学 | There is the double peak cam design method of diesel exhaust recirculation function |
DE102016201499B4 (en) * | 2016-02-01 | 2021-03-11 | Mtu Friedrichshafen Gmbh | Valve drive for an internal combustion engine, internal combustion engine with such a valve drive, and method for operating a valve drive |
CN109804151B (en) | 2016-10-06 | 2022-03-29 | 沃尔沃卡车集团 | Internal combustion engine and method for controlling braking torque of engine |
SE541865C2 (en) * | 2017-03-22 | 2020-01-02 | Scania Cv Ab | Four-stroke internal combustion engine and thereto related vehicle and method |
DE102017205034B4 (en) * | 2017-03-24 | 2021-12-02 | Mtu Friedrichshafen Gmbh | Method for operating an internal combustion engine and an internal combustion engine |
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2005
- 2005-07-12 JP JP2007520657A patent/JP2008506878A/en active Pending
- 2005-07-12 CN CN2005800007809A patent/CN1839250B/en active Active
- 2005-07-12 DE DE112005000030T patent/DE112005000030D2/en not_active Expired - Fee Related
- 2005-07-12 DE DE502005000233T patent/DE502005000233D1/en active Active
- 2005-07-12 US US10/574,000 patent/US7311072B2/en active Active
- 2005-07-12 WO PCT/DE2005/001218 patent/WO2006007817A1/en active IP Right Grant
- 2005-07-12 EP EP05766972A patent/EP1649148B1/en active Active
Also Published As
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US20070039577A1 (en) | 2007-02-22 |
WO2006007817A1 (en) | 2006-01-26 |
EP1649148A1 (en) | 2006-04-26 |
DE502005000233D1 (en) | 2007-01-25 |
JP2008506878A (en) | 2008-03-06 |
CN1839250A (en) | 2006-09-27 |
DE112005000030D2 (en) | 2006-10-05 |
US7311072B2 (en) | 2007-12-25 |
CN1839250B (en) | 2011-01-05 |
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