EP2173977A1 - Valve train actuating device - Google Patents

Valve train actuating device

Info

Publication number
EP2173977A1
EP2173977A1 EP08801530A EP08801530A EP2173977A1 EP 2173977 A1 EP2173977 A1 EP 2173977A1 EP 08801530 A EP08801530 A EP 08801530A EP 08801530 A EP08801530 A EP 08801530A EP 2173977 A1 EP2173977 A1 EP 2173977A1
Authority
EP
European Patent Office
Prior art keywords
gas exchange
exchange valve
crankshaft
actuating device
decompression
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.)
Granted
Application number
EP08801530A
Other languages
German (de)
French (fr)
Other versions
EP2173977B1 (en
Inventor
Marcus Hergert
Kai Kanning
Stefan Rudert
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.)
Mercedes Benz Group AG
Original Assignee
Daimler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler AG filed Critical Daimler AG
Publication of EP2173977A1 publication Critical patent/EP2173977A1/en
Application granted granted Critical
Publication of EP2173977B1 publication Critical patent/EP2173977B1/en
Active legal-status Critical Current
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
    • 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
    • F01L13/065—Compression release engine retarders of the "Jacobs Manufacturing" type
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0273—Multiple actuations of a valve within an engine cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake

Definitions

  • the invention relates to a gas exchange valve actuating device according to the preamble of claim 1.
  • the invention has for its object to provide a decompression brake device with a maximum braking power in different operating conditions.
  • the object is achieved in each case by the features of patent claim 1, wherein further embodiments of the invention can be taken from the subclaims.
  • the invention is based on a gas exchange valve actuating device, in particular for an internal combustion engine, with at least one firing camshaft which is phase-adjustable by means of a firing camshaft adjusting device to a crankshaft, and with a decompression brake device comprising at least one brake cam and at least one Dekompressionsgas monventil.
  • the gas exchange valve actuating device comprises an adjusting device which is provided to set a Dekompressionsgas crispventilbe- actuating time.
  • a “decompression gas exchange valve actuation time” should in particular be understood to mean a time that is related to the crankshaft, in particular a phase time point related to the crankshaft, at which the decompression gas exchange valve is actuated by the decompression brake device. and in particular is opened, the Dekompressionsgas grillventi! can be made in one piece or in several parts with a gas outlet.
  • “provided” is meant in particular specially equipped, designed and / or programmed
  • the brake cam is arranged on the firing camshaft.
  • a decompression brake device with an adjustable gas exchange valve actuation time which can be produced in a particularly simple and cost-effective manner.
  • an arrangement of the brake cam on a brake camshaft is conceivable.
  • the decompression gas exchange valve actuation timing at which the brake cam disposed on the firing camshaft actuates the decompression gas exchange valve can be set particularly easily.
  • the adjusting device is at least partially designed in one piece with the Befashionungsnockenwellenverstellvorraum. As a result, material, components and costs can be saved and the decompression brake can be made very compact.
  • a control unit provided to set the decompressing gas change valve actuation timing is proposed.
  • the decompression brake device can be adapted particularly flexibly to different operating conditions.
  • control unit is provided to set the Dekompressionsgaswech- selventilbetuschists time in dependence on a speed of the crankshaft.
  • a braking power adapted to the operating state can be set.
  • Dependence on further or alternative parameters that appear reasonable to a person skilled in the art, for example as a function of a loading state or a driver's request.
  • the brake camshaft actuation time is shifted in the direction of a top dead center with a decreasing rotational speed of the crankshaft.
  • a “top dead center” should be understood in particular a position of the crankshaft, in which a direction of movement of a piston attached to the crankshaft is changed or a position of the piston at which a compression of a gas enclosed in a cylinder by the piston is maximum.
  • FIG. 1 shows a gas exchange valve actuating device in the closed state
  • FIG. 2 shows a gas exchange valve actuating device in the open state at a top dead center of a crankshaft.
  • FIG. 1 shows a cross section through a gas exchange valve actuating device for an internal combustion engine with a firing camshaft 10, which is phase-adjustable by means of a firing camshaft adjusting device 11 to a crankshaft 12.
  • a decompression brake device 13 is arranged, which comprises a brake cam 14 and a decompression gas exchange valve 15.
  • the gas exchange valve actuating device comprises an adjusting device 16, by means of which a decompression device gas exchange valve timing at which the Dekompressionsgas monventi! 13 is opened, can be adjusted.
  • the brake cam 14 of the decompression brake device 13 is disposed on the firing camshaft 10. Via a brake cam follower 17, which is arranged on a brake rocker arm 18, the brake cam 14 is connected to the brake rocker arm 18.
  • the brake cam follower 17 follows the movement of the brake cam 14, whereby the brake rocker arm 18 performs a pivoting movement.
  • the brake rocker arm 18 is connected via a suitable device 27 with the decompression gas exchange valve 15 and the decompression gas exchange valve 15 is opened by the pivoting movement of the brake rocker arm 18 ( Figure 2).
  • rocker arm 26 About another rocker arm 26 is the Dekompressionsgas grillventi! 15, which also forms an exhaust gas outlet valve for a firing operation, connected to an exhaust cam 19.
  • the rocker arm 26 follows the movements of the exhaust cam 19 via a cam follower 25.
  • the gas 24 enclosed in a cylinder 20 is compressed by a movement of a piston 21 and a pressure is built up.
  • a maximum built-up pressure of the gas 24 enclosed in the cylinder 20, which is reached when the decompression gas exchange valve 15 remains closed, increases in particular with an increasing rotational speed of the crankshaft 12.
  • the rotational speed of the crankshaft 12 corresponds in particular to a rotational speed of the internal combustion engine.
  • An energy that is expended to compress the gas 24 depends, in particular, on the pressure built up in the cylinder 20. By opening the decompression gas exchange valve 15, the energy expended is dissipated in particular as heat energy and a braking effect is created.
  • a decompression gas exchange valve actuation time is set via a phase angle between the crankshaft 12 and the firing camshaft 10 at which the decompression gas exchange valve 15 is opened.
  • the pressure built up in the cylinder 20 is always less than or equal to a maximum allowable cylinder pressure.
  • the firing camshaft 10 is rotated by the adjusting device 16 against the crankshaft 12.
  • the pressure in the cylinder 20 is built up faster than at a low speed. Since the built-up pressure at a high speed is greater than at a low speed, especially at a high speed of the pressure built up in the cylinder 20 may exceed the maximum allowable cylinder pressure. To avoid this, the decompression gas exchange valve 15 is opened before reaching a top dead center 23, especially at a high speed.
  • the control unit 22 shifts the decompression gas exchange valve timing with decreasing speed in the direction of top dead center 23.
  • the maximum pressure built up of the gas 24 enclosed in the cylinder 20 remains below the maximum allowable cylinder pressure.
  • the decompression gas exchange valve 15 is then opened at top dead center 23 when the pressure built up in the cylinder 20 reaches a maximum and maximum braking power can be achieved. In principle, however, the decompression gas exchange valve 15 can also be opened at an earlier point in time if a small braking power is sufficient.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The invention relates to a valve train actuating device, particularly for an internal combustion engine, having at least one firing camshaft (10), which can be phase-shifted toward a crankshaft (12) by means of a firing camshaft adjusting device (11), and having a decompression brake device (13) comprising at least one brake cam (14) and at least one decompression valve train (15). The invention provides that the valve train actuating device comprises an adjusting device (16) intended for adjusting a decompression valve train point of time.

Description

Gaswechselventilbetätigungsvorrichtung Gas exchange valve actuating device
Die Erfindung betrifft eine Gaswechselventilbetätigungsvorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a gas exchange valve actuating device according to the preamble of claim 1.
Es sind bereits Gaswechselventilbetätigungsvorrichtungen. insbesondere für Brennkraftmaschinen, mit zumindest einer Befeuerungsnockenwelle, die mittels einer Befeuerungs- nockenwellenverstellvorrichtung phasenverstellbar zu einer Kurbelwelle ist, und mit einer Dekompressionsbremsvorrichtung, die zumindest einen Bremsnocken und zumindest ein Dekompressionsgaswechselventil umfasst, bekannt.There are already gas exchange valve actuators. in particular for internal combustion engines, with at least one firing camshaft which is phase-adjustable by means of a firing camshaft adjusting device to a crankshaft, and with a decompression brake device comprising at least one brake cam and at least one Dekompressionsgaswechselventil known.
Der Erfindung liegt die Aufgabe zugrunde, eine Dekompressionsbremsvorrichtung mit einer maximalen Bremsleistung in unterschiedlichen Betriebszuständen bereitzustellen. Die Aufgabe wird jeweils gelöst durch die Merkmale des Patentanspruchs 1 , wobei weitere Ausgestaltungen der Erfindung den Unteransprüchen entnommen werden können.The invention has for its object to provide a decompression brake device with a maximum braking power in different operating conditions. The object is achieved in each case by the features of patent claim 1, wherein further embodiments of the invention can be taken from the subclaims.
Die Erfindung geht aus von einer Gaswechselventilbetätigungsvorrichtung, insbesondere für eine Brennkraftmaschine, mit zumindest einer Befeuerungsnockenwelle, die mittels einer Befeuerungsnockenwellenverstellvorrichtung phasenverstellbar zu einer Kurbelwelle ist, und mit einer Dekompressionsbremsvorrichtung, die zumindest einen Bremsnocken und zumindest ein Dekompressionsgaswechselventil umfasst. Es wird vorgeschlagen, dass die Gaswechselventilbetätigungsvorrichtung eine Verstellvorrichtung umfasst, die dazu vorgesehen ist, einen Dekompressionsgaswechselventilbe- tätigungszeitpunkt einzustellen. Unter einem „Dekompressionsgaswechselventilbetäti- gungszeitpunkt" soll insbesondere ein auf die Kurbelwelle bezogener Zeitpunkt, insbesondere ein auf die Kurbelwelle bezogener Phasenzeitpunkt, verstanden werden, an dem das Dekompressionsgaswechselventil durch die Dekompressionsbremsvorrichtung betä- tigt und insbesondere geöffnet wird, wobei das Dekompressionsgaswechselventi! einteilig oder mehrteilig mit einem Gasauslassventil ausgeführt sein kann. Unter „vorgesehen" soll insbesondere speziell ausgestattet, ausgelegt und/oder programmiert verstanden werden. Durch einen einstellbaren Gaswechselventilbetätigungszeitpunkt kann eine Dekompres- sionsbremsvorrichtung mit einer maximalen Bremsleistung in unterschiedlichen Betriebs- zuständen einfach bereitgestellt werden.The invention is based on a gas exchange valve actuating device, in particular for an internal combustion engine, with at least one firing camshaft which is phase-adjustable by means of a firing camshaft adjusting device to a crankshaft, and with a decompression brake device comprising at least one brake cam and at least one Dekompressionsgaswechselventil. It is proposed that the gas exchange valve actuating device comprises an adjusting device which is provided to set a Dekompressionsgaswechselventilbe- actuating time. A "decompression gas exchange valve actuation time" should in particular be understood to mean a time that is related to the crankshaft, in particular a phase time point related to the crankshaft, at which the decompression gas exchange valve is actuated by the decompression brake device. and in particular is opened, the Dekompressionsgaswechselventi! can be made in one piece or in several parts with a gas outlet. By "provided" is meant in particular specially equipped, designed and / or programmed By an adjustable gas exchange valve actuation time, a decompression brake device with a maximum braking power in different operating states can be easily provided.
Weiter wird vorgeschlagen, dass der Bremsnocken auf der Befeuerungsnockenwelle angeordnet ist. Dadurch kann eine besonders einfach und kostengünstig herstellbare De- kompressionsbremsvorrichtung mit einem einstellbaren Gaswechselventilbetätigungszeit- punkt bereitgestellt werden. Grundsätzlich ist aber auch eine Anordnung des Bremsnockens auf einer Bremsnockenwelle denkbar.It is further proposed that the brake cam is arranged on the firing camshaft. As a result, it is possible to provide a decompression brake device with an adjustable gas exchange valve actuation time which can be produced in a particularly simple and cost-effective manner. In principle, however, an arrangement of the brake cam on a brake camshaft is conceivable.
Ist ferner die Verstellvorrichtung dazu vorgesehen, eine PhasenversteNung zwischen der Kurbelwelle und der Befeuerungsnockenwelle einzustellen, kann der Dekompressions- gaswechselventilbetätigungszeitpunkt, an dem der auf der Befeuerungsnockenwelle angeordnete Bremsnocken das Dekompressionsgaswechselventil betätigt, besonders einfach eingestellt werden.Further, if the adjusting device is provided to set a phase shift between the crankshaft and the firing camshaft, the decompression gas exchange valve actuation timing at which the brake cam disposed on the firing camshaft actuates the decompression gas exchange valve can be set particularly easily.
Weiter ist es vorteilhaft, wenn die Verstellvorrichtung zumindest teilweise einstückig mit der Befeuerungsnockenwellenverstellvorrichtung ausgeführt ist. Dadurch können Material, Bauteile und Kosten eingespart werden und die Dekompressionsbremsvorrichtung kann besonders kompakt ausgeführt werden.Further, it is advantageous if the adjusting device is at least partially designed in one piece with the Befeuerungsnockenwellenverstellvorrichtung. As a result, material, components and costs can be saved and the decompression brake can be made very compact.
Ferner wird eine Steuereinheit, die dazu vorgesehen ist, den Dekompressionsgaswech- selventilbetätigungszeitpunkt einzustellen, vorgeschlagen. Durch eine Steuereinheit kann die Dekompressionsbremsvorrichtung besonders flexibel an verschiedene Betriebszu- stände angepasst werden.Further, a control unit provided to set the decompressing gas change valve actuation timing is proposed. By means of a control unit, the decompression brake device can be adapted particularly flexibly to different operating conditions.
Vorteilhafterweise ist die Steuereinheit dazu vorgesehen, den Dekompressionsgaswech- selventilbetätigungszeitpunkt in Abhängigkeit von einer Drehzahl der Kurbelwelle einzustellen. Dadurch kann eine an den Betriebszustand angepasste Bremsleistung eingestellt werden. Insbesondere kann durch eine Einstellung in Abhängigkeit von der Drehzahl der Kurbelwelle, die insbesondere einer Drehzahl einer Brennkraftmaschine entspricht, ein zu hoher Zylinderdruck vermieden werden. Grundsätzlich ist aber auch eine Einstellung in Abhängigkeit von weiteren oder alternativen, dem Fachmann als sinnvoll erscheinenden Parametern möglich, wie beispielsweise in Abhängigkeit von einem Beladungszustand oder einem Fahrerwunsch.Advantageously, the control unit is provided to set the Dekompressionsgaswech- selventilbetätigungs time in dependence on a speed of the crankshaft. As a result, a braking power adapted to the operating state can be set. In particular, can be avoided by setting in dependence on the speed of the crankshaft, which corresponds in particular to a speed of an internal combustion engine, too high a cylinder pressure. Basically, but also a setting in Dependence on further or alternative parameters that appear reasonable to a person skilled in the art, for example as a function of a loading state or a driver's request.
Erfolgt die Einstellung in Abhängigkeit von einer Drehzahl der Kurbelwelle, so wird insbesondere vorgeschlagen, dass der Bremsnockenwellenbetätigungszeitpunkt mit einer kleiner werdenden Drehzahl der Kurbelwelle in Richtung eines oberen Totpunkts verschoben wird. Unter einem „oberen Totpunkt" soll insbesondere eine Stellung der Kurbelwelle verstanden werden, bei der eine Bewegungsrichtung eines an der Kurbelwelle befestigten Kolbens geändert wird bzw. eine Stellung des Kolbens, an dem eine Kompression eines in einem Zylinder eingeschlossenen Gases durch den Kolben maximal ist. Durch eine derartige Einstellung kann auch in einem Betriebszustand mit einer kleinen Drehzahl ein maximales Bremsmoment bereitgestellt werden.If the adjustment is made as a function of a rotational speed of the crankshaft, it is in particular proposed that the brake camshaft actuation time is shifted in the direction of a top dead center with a decreasing rotational speed of the crankshaft. A "top dead center" should be understood in particular a position of the crankshaft, in which a direction of movement of a piston attached to the crankshaft is changed or a position of the piston at which a compression of a gas enclosed in a cylinder by the piston is maximum. By setting such a maximum braking torque can be provided even in an operating state with a low speed.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In den Zeichnungen ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawings, an embodiment of the invention is shown. The description and claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.
Dabei zeigen:Showing:
Fig. 1 eine Gaswechselventilbetätigungsvorrichtung in geschlossenem Zustand und Fig. 2 eine Gaswechselventilbetätigungsvorrichtung in geöffnetem Zustand an einem oberen Totpunkt einer Kurbelwelle.1 shows a gas exchange valve actuating device in the closed state and FIG. 2 shows a gas exchange valve actuating device in the open state at a top dead center of a crankshaft.
Figur 1 zeigt einen Querschnitt durch eine Gaswechselventilbetätigungsvorrichtung für eine Brennkraftmaschine mit einer Befeuerungsnockenwelle 10, die mittels einer Befeue- rungsnockenwellenverstellvorrichtung 11 phasenverstellbar zu einer Kurbelwelle 12 ist. In der Gaswechselventilbetätigungsvorrichtung ist eine Dekompressionsbremsvorrichtung 13 angeordnet, die einen Bremsnocken 14 und ein Dekompressionsgaswechselventil 15 umfasst. Um eine maximale Bremsleistung erzielen zu können, umfasst die Gaswechsel- ventilbetätigungsvorrichtung eine Verstellvorrichtung 16, mittels der ein Dekompressions- gaswechselventilbetätigungszeitpunkt, an dem das Dekompressionsgaswechselventi! 13 geöffnet wird, eingestellt werden kann.FIG. 1 shows a cross section through a gas exchange valve actuating device for an internal combustion engine with a firing camshaft 10, which is phase-adjustable by means of a firing camshaft adjusting device 11 to a crankshaft 12. In the gas exchange valve operating device, a decompression brake device 13 is arranged, which comprises a brake cam 14 and a decompression gas exchange valve 15. In order to achieve a maximum braking power, the gas exchange valve actuating device comprises an adjusting device 16, by means of which a decompression device gas exchange valve timing at which the Dekompressionsgaswechselventi! 13 is opened, can be adjusted.
Der Bremsnocken 14 der Dekompressionsbremsvorrichtung 13 ist auf der Befeuerungsnockenwelle 10 angeordnet. Über einen Bremsnockenfolger 17, der an einem Bremskipphebel 18 angeordnet ist, ist der Bremsnocken 14 mit dem Bremskipphebel 18 verbunden. Der Bremsnockenfolger 17 folgt der Bewegung des Bremsnockens 14, wodurch der Bremskipphebel 18 eine Schwenkbewegung ausführt. In einem Bremsbetrieb, in dem die Dekompressionsbremsvorrichtung 13 aktiviert ist, wird der Bremskipphebel 18 über eine geeignete Vorrichtung 27 mit dem Dekompressionsgaswechselventil 15 verbunden und das Dekompressionsgaswechselventil 15 wird durch die Schwenkbewegung des Bremskipphebels 18 geöffnet (Figur 2).The brake cam 14 of the decompression brake device 13 is disposed on the firing camshaft 10. Via a brake cam follower 17, which is arranged on a brake rocker arm 18, the brake cam 14 is connected to the brake rocker arm 18. The brake cam follower 17 follows the movement of the brake cam 14, whereby the brake rocker arm 18 performs a pivoting movement. In a braking operation in which the decompression brake device 13 is activated, the brake rocker arm 18 is connected via a suitable device 27 with the decompression gas exchange valve 15 and the decompression gas exchange valve 15 is opened by the pivoting movement of the brake rocker arm 18 (Figure 2).
Über einen weiteren Kipphebel 26 ist das Dekompressionsgaswechselventi! 15, das zugleich ein Abgasauslassventil für einen Befeuerungsbetrieb bildet, mit einem Auslassnocken 19 verbunden. Der Kipphebel 26 folgt über einen Nockenfolger 25 den Bewegungen des Auslassnockens 19. Durch den Auslassnocken 19 und den Kipphebel 26 wird insbesondere in einem Befeuerungsbetrieb das Dekompressionsgaswechselventil 15, das dann das Abgasauslassventil bildet, geöffnet.About another rocker arm 26 is the Dekompressionsgaswechselventi! 15, which also forms an exhaust gas outlet valve for a firing operation, connected to an exhaust cam 19. The rocker arm 26 follows the movements of the exhaust cam 19 via a cam follower 25. The exhaust cam 19 and the rocker arm 26, in particular in a firing operation, open the decompression gas exchange valve 15, which then forms the exhaust gas outlet valve.
Die Verstellvorrichtung 16, die den Dekompressionsgaswechselventilbetätigungszeitpunkt einstellt, ist, da der Bremsnocken 14 auf der Befeuerungsnockenwelle 10 angeordnet ist, vorteilhafterweise einteilig mit der Befeuerungsnockenwellenverstellvorrichtung 11 ausgeführt.The adjusting device 16, which sets the decompression gas exchange valve timing, since the brake cam 14 is disposed on the firing camshaft 10 is advantageously carried out in one piece with the firing camshaft adjuster 11.
Insbesondere im Bremsbetrieb wird das in einem Zylinder 20 eingeschlossene Gas 24 durch eine Bewegung eines Kolbens 21 komprimiert und ein Druck wird aufgebaut. Ein maximal aufgebauter Druck des in dem Zylinder 20 eingeschlossenen Gases 24, der erreicht wird, wenn das Dekompressionsgaswechselventil 15 geschlossen bleibt, steigt insbesondere mit einer größer werdenden Drehzahl der Kurbelwelle 12 an. Die Drehzahl der Kurbelwelle 12 entspricht insbesondere einer Drehzahl der Brennkraftmaschine. Eine Energie, die zu einer Kompression des Gases 24 aufgewendet wird, hängt insbesondere von dem in dem Zylinder 20 aufgebauten Druck ab. Durch das Öffnen des De- kompressionsgaswechselventils 15 wird die aufgewendete Energie insbesondere als eine Wärmeenergie abgeführt und es entsteht eine Bremswirkung. Mittels einer Steuereinheit 22 wird über einen Phasenwinkel zwischen der Kurbelwelle 12 und der Befeuerungsnockenwelle 10 ein Dekompressionsgaswechselventilbetätigungs- zeitpunkt eingestellt, an dem das Dekompressionsgaswechselventil 15 geöffnet wird. Der in dem Zylinder 20 aufgebaute Druck bleibt immer kleiner oder gleich wie ein maximal zulässiger Zylinderdruck. Zur Einstellung des Phasenwinkels wird die Befeuerungsnockenwelle 10 durch die Verstellvorrichtung 16 gegen die Kurbelwelle 12 verdreht.In particular, in the braking operation, the gas 24 enclosed in a cylinder 20 is compressed by a movement of a piston 21 and a pressure is built up. A maximum built-up pressure of the gas 24 enclosed in the cylinder 20, which is reached when the decompression gas exchange valve 15 remains closed, increases in particular with an increasing rotational speed of the crankshaft 12. The rotational speed of the crankshaft 12 corresponds in particular to a rotational speed of the internal combustion engine. An energy that is expended to compress the gas 24 depends, in particular, on the pressure built up in the cylinder 20. By opening the decompression gas exchange valve 15, the energy expended is dissipated in particular as heat energy and a braking effect is created. By means of a control unit 22, a decompression gas exchange valve actuation time is set via a phase angle between the crankshaft 12 and the firing camshaft 10 at which the decompression gas exchange valve 15 is opened. The pressure built up in the cylinder 20 is always less than or equal to a maximum allowable cylinder pressure. To adjust the phase angle, the firing camshaft 10 is rotated by the adjusting device 16 against the crankshaft 12.
Bei einer hohen Drehzahl wird der Druck in dem Zylinder 20 schneller aufgebaut als bei einer niedrigen Drehzahl. Da der aufgebaute Druck bei einer hohen Drehzahl größer ist als bei einer niedrigen Drehzahl, kann insbesondere bei einer hohen Drehzahl der in dem Zylinder 20 aufgebaute Druck den maximal zulässigen Zylinderdruck überschreiten. Um das zu vermeiden, wird insbesondere bei einer hohen Drehzahl das Dekompressionsgaswechselventil 15 vor Erreichen eines oberen Totpunkts 23 geöffnet.At a high speed, the pressure in the cylinder 20 is built up faster than at a low speed. Since the built-up pressure at a high speed is greater than at a low speed, especially at a high speed of the pressure built up in the cylinder 20 may exceed the maximum allowable cylinder pressure. To avoid this, the decompression gas exchange valve 15 is opened before reaching a top dead center 23, especially at a high speed.
Bei einer niedrigen Drehzahl wird der Druck in dem Zylinder 20 langsam aufgebaut und der maximal zulässige Zylinderdruck wird später erreicht. Um eine maximale Bremsleistung zu erzielen, verschiebt die Steuereinheit 22 den Dekompressionsgaswechselventil- betätigungszeitpunkt mit kleiner werdender Drehzahl in Richtung des oberen Totpunkts 23. Bei einer sehr kleinen Drehzahl bleibt der maximal aufgebaute Druck des in dem Zylinder 20 eingeschlossenen Gases 24 unterhalb des maximal zulässigen Zylinderdrucks. Das Dekompressionsgaswechselventil 15 wird dann am oberen Totpunkt 23 geöffnet, wenn der in dem Zylinder 20 aufgebaute Druck ein Maximum erreicht und eine maximale Bremsleistung erzielt werden kann. Grundsätzlich kann das Dekompressionsgaswechselventil 15 aber auch zu einem früheren Zeitpunkt geöffnet werden, wenn eine kleine Bremsleistung ausreichend ist. At a low speed, the pressure in the cylinder 20 is built up slowly and the maximum allowable cylinder pressure is reached later. In order to achieve maximum braking power, the control unit 22 shifts the decompression gas exchange valve timing with decreasing speed in the direction of top dead center 23. At a very low speed, the maximum pressure built up of the gas 24 enclosed in the cylinder 20 remains below the maximum allowable cylinder pressure. The decompression gas exchange valve 15 is then opened at top dead center 23 when the pressure built up in the cylinder 20 reaches a maximum and maximum braking power can be achieved. In principle, however, the decompression gas exchange valve 15 can also be opened at an earlier point in time if a small braking power is sufficient.

Claims

Patentansprüche claims
1. Gaswechselventilbetätigungsvorrichtung, insbesondere für eine Brennkraftmaschine, mit zumindest einer Befeuerungsnockenwelle (10), die mittels einer Befeue- rungsnockenwellenverstellvorrichtung (11) phasenverstellbar zu einer Kurbelwelle (12) ist, und mit einer Dekompressionsbremsvorrichtung (13). die zumindest einen Bremsnocken (14) und zumindest ein Dekompressionsgaswechselventil (15) um- fasst, gekennzeichnet durch eine Verstellvorrichtung (16), die dazu vorgesehen ist, einen Dekompressionsgas- wechselventilbetätigungszeitpunkt einzustellen.A gas exchange valve actuating device, in particular for an internal combustion engine, having at least one firing camshaft (10) which is phase-adjustable to a crankshaft (12) by means of a firing camshaft adjusting device (11) and a decompression brake device (13). the at least one brake cam (14) and at least one Dekompressionsgaswechselventil (15) comprises, characterized by an adjusting device (16) which is intended to set a Dekompressionsgas- changeover valve actuation time.
2. Gaswechselventilbetätigungsvorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der Bremsnocken (14) auf der Befeuerungsnockenwelle (10) angeordnet ist.2. Gas exchange valve actuating device according to claim 1, characterized in that the brake cam (14) on the firing camshaft (10) is arranged.
3. Gaswechselventilbetätigungsvorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Verstellvorrichtung (16) dazu vorgesehen ist, eine Phasenverstellung zwischen der Kurbelwelle (12) und der Befeuerungsnockenwelle (10) einzustellen.3. gas exchange valve actuating device according to claim 2, characterized in that the adjusting device (16) is provided to adjust a phase adjustment between the crankshaft (12) and the firing camshaft (10).
4. Gaswechselventilbetätigungsvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verstellvorrichtung (16) zumindest teilweise einstückig mit der Befeuerungsno- ckenwellenverstellvorrichtung (11) ausgeführt ist. 4. Gas exchange valve actuating device according to one of the preceding claims, characterized in that the adjusting device (16) at least partially in one piece with the firing covewellenvestellvorrichtung (11) is executed.
5. Gaswechselventübetätigungsvorrichtung nach einem der vorhergehenden Ansprüche, gekennzeichnet durch eine Steuereinheit (22), die dazu vorgesehen ist, den Dekompressionsgaswechsel- ventilbetätigungszeitpunkt einzustellen.5. Gas exchange valve actuating device according to one of the preceding claims, characterized by a control unit (22) which is provided to set the Dekompressionsgaswechsel- valve actuation time.
6. Gaswechselventilbetätigungsvorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Steuereinheit (22) dazu vorgesehen ist, den Dekompressionsgaswechselventil- betätigungszeitpunkt in Abhängigkeit von einer Drehzahl der Kurbelwelle (12) einzustellen.6. gas exchange valve actuating device according to claim 5, characterized in that the control unit (22) is provided to adjust the Dekompressionsgaswechselventil- actuation time in dependence on a speed of the crankshaft (12).
7. Verfahren für eine Gaswechselventilbetätigungsvorrichtung, insbesondere für eine Brennkraftmaschine, mit zumindest einer Befeuerungsnockenwelle (10), die mittels einer Befeuerungsnockenwellenverstellvorrichtung (11) phasenverstellbar zu einer Kurbelwelle (12) ist, und mit einer Dekompressionsbremsvorrichtung (13), die zumindest einen Bremsnocken (14) und zumindest ein Dekompressionsgaswechsel- ventil (15) umfasst, insbesondere für eine Gaswechselventilbetätigungsvorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass ein Gaswechselventilbetätigungszeitpunkt in Abhängigkeit von einer Drehzahl der7. A method for a Gaswechselventilbetätigungsvorrichtung, in particular for an internal combustion engine, with at least one firing camshaft (10) by means of a Befürnungsnockenwellenverstellvorrichtung (11) is phase adjustable to a crankshaft (12), and with a decompression brake device (13), the at least one brake cam (14 ) and at least one Dekompressionsgaswechsel- valve (15), in particular for a gas exchange valve actuating device according to one of claims 1 to 6, characterized in that a gas exchange valve actuation time in dependence on a speed of
Kurbelwelle (12) eingestellt wird.Crankshaft (12) is set.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass der Bremsnockenwellenbetätigungszeitpunkt mit einer kleiner werdenden Drehzahl der Kurbelwelle (12) in Richtung eines oberen Totpunkts (23) verschoben wird. 8. The method according to claim 7, characterized in that the Bremsnockenwellenbetätigungszeitpunkt with a decreasing speed of the crankshaft (12) in the direction of a top dead center (23) is moved.
EP08801530.0A 2007-08-11 2008-08-07 Valve train actuating device Active EP2173977B1 (en)

Applications Claiming Priority (2)

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DE102007038078A DE102007038078A1 (en) 2007-08-11 2007-08-11 Gas exchange valve actuating device
PCT/EP2008/006487 WO2009021666A1 (en) 2007-08-11 2008-08-07 Valve train actuating device

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JP (1) JP5335792B2 (en)
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DE102007038078A1 (en) 2009-02-12
WO2009021666A1 (en) 2009-02-19
CN101784758A (en) 2010-07-21
US8230837B2 (en) 2012-07-31
JP5335792B2 (en) 2013-11-06
CN101784758B (en) 2012-07-04
RU2445472C2 (en) 2012-03-20
JP2010535981A (en) 2010-11-25
EP2173977B1 (en) 2017-03-01
RU2010108417A (en) 2011-09-20

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