WO2013104612A1 - Unité de commande de soupape hydraulique entièrement variable destinée aux soupapes d'échange gazeux de moteurs à combustion interne à pistons alternatifs, notamment à des moteurs à plusieurs cylindres - Google Patents

Unité de commande de soupape hydraulique entièrement variable destinée aux soupapes d'échange gazeux de moteurs à combustion interne à pistons alternatifs, notamment à des moteurs à plusieurs cylindres Download PDF

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Publication number
WO2013104612A1
WO2013104612A1 PCT/EP2013/050201 EP2013050201W WO2013104612A1 WO 2013104612 A1 WO2013104612 A1 WO 2013104612A1 EP 2013050201 W EP2013050201 W EP 2013050201W WO 2013104612 A1 WO2013104612 A1 WO 2013104612A1
Authority
WO
WIPO (PCT)
Prior art keywords
control unit
internal combustion
valve control
pressure
gas exchange
Prior art date
Application number
PCT/EP2013/050201
Other languages
German (de)
English (en)
Inventor
Murat YAKAN
Alexandra OKOMONSKI
Original Assignee
Schaeffler Technologies AG & Co. KG
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 Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2013104612A1 publication Critical patent/WO2013104612A1/fr

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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
    • 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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column

Definitions

  • Fully variable hydraulic valve control unit for gas exchange valves of reciprocating piston internal combustion engines, in particular multi-cylinder engines, with at least one pressure generating unit driven by the internal combustion engine,
  • a housing unit which is connectable to a cylinder head of the reciprocating internal combustion engine and at least receives the Nehmerajien.
  • Such a fully variable hydraulic valve control unit for gas exchange valves is known from DE-10 2009 01 1 983 A1.
  • This valve control unit is completely integrated in a block which is screwed along the gas exchange valves with a cylinder head of the reciprocating internal combustion engine.
  • Each of the receiver unit is in operative connection with a gas exchange valve, the in turn, is spring-loaded in the closing direction and thereby the actuating direction of the receiving unit is counteracted.
  • the valve control unit is operatively connected to cams of a camshaft whose number corresponds to the number of gas exchange valves or groups of gas exchange valves to be actuated.
  • the cams individually act on pressure generating units, wherein each pressure generating unit assigned to a Nehmeriki and a hydraulic switching valve, which dominates an inner hydraulic line system, which is still assigned a respective pressure accumulator.
  • the known valve control unit is therefore only summarized spatially and has the cylinders of the reciprocating internal combustion engine corresponding individual control units, so that this system is always adapted only to a specific engine and designed accordingly. It must therefore, as previously in mechanical valve controls, a camshaft with the number of cylinders of the internal combustion engine corresponding number of cams are provided and it is a corresponding number of pressure generating units required.
  • the block preferably made of aluminum is therefore very expensive and requires a complex processing. In particular, various holes in the block are required, which must be re-clamped several times during processing.
  • the object of the invention is therefore to simplify the known fully variable hydraulic valve control unit significantly and represent cheaper in construction.
  • the proposed valve control unit should be constructed according to the modular principle and thereby be favorable in terms of repair / maintenance, construction and costs. Summary of the invention
  • valve control unit has three independent units, which can be modified and combined as required by the internal combustion engine.
  • the pressure generating unit formed as a structural unit is designed as at least one independently of the timing of the gas exchange valves controlled high-pressure pump, which is connected by means of a high pressure line to the high-pressure chamber.
  • the high-pressure pump can be designed as desired and only needs to be designed so that it provides a sufficient amount of hydraulic fluid in the required pressure level available. It may, for example, be a pump driven independently of the camshaft, eg. B. a radial pump, act, which can be grown at any point of the reciprocating internal combustion engine.
  • the high-pressure pump is designed as a single-piston pump whose ram is in operative connection with a plurality of cams of a cam disc of a camshaft. Since the pressure generating unit or the high-pressure pump is independent of the timing of the gas exchange valves, a plurality of cams can be arranged on a cam disc. Depending on the size of the reciprocating internal combustion engine, it is also possible to provide two separate high-pressure pumps, which are then connected together to the high-pressure chamber.
  • the high-pressure pump can either be connected directly to the oil pump of the reciprocating internal combustion engine or it can be tapped the oil-carrying lines of the cylinder head.
  • the plunger is preferably connected to the cams via a roller, so that the pump of the cam mechanism ometrie follow easily and the friction at the contact can be kept low.
  • the designed as a structural unit high-pressure chamber is designed as a high-pressure accumulator, with which all switching valves of the reciprocating internal combustion engine are connected together hydraulically.
  • the high-pressure accumulator arranged along the cylinder head is preferably designed as a so-called “common rail” accumulator, which is arranged along the cylinder head with respect to the gas exchange valves All the switching valves are individually attached to the high-pressure accumulator so that hydraulic pressure fluid is continuously available to the switching valves.
  • Hydraulic pressure lines are connected to the switching valves leading to a housing unit provided as a third unit, which incorporates hydraulic brakes with slave units, and the hydraulic branches coming from the selector valves, leading directly to the hydraulic brakes If one of the gas exchange valves is now to be opened, one of the switching valves is opened at a certain point in time, so that finally a pressure is applied to a specific receiver unit
  • two separate Hoch horrauche Trenten emanate from one switching valve, for example, to open two gas exchange valves, for example, two intake or two exhaust valves simultaneously.
  • the switching valves designed as two-way quick-acting valves therefore control the start of opening of at least one gas exchange valve and its lifting height. Thereafter, the switching valve is closed.
  • the end of the valve lift is determined by the electrically controlled hydraulic shut-off valve, which keeps the pressure chamber in front of the receiver unit (s) closed or connects to an outflow line. Furthermore, an accumulator capsule is attached to the high-pressure accumulator, which compensates for pressure fluctuations in the system. Also, a temperature sensor is provided which determines the temperature and thus the viscosity of the hydraulic fluid and as a control variable, the opening duration of the switching valves bez. of the Ab tenuventile influenced because the flowing through the valves amount of hydraulic pressure fluid is dependent on the viscosity.
  • the proposed fully variable hydraulic valve control unit is variable in construction, since the central high-pressure accumulator is always acted upon by hydraulic fluid regardless of timing with hydraulic fluid and the opening and closing of Nehmerikien done by switching valves and Ab tenuventile, which in turn are not bound to a block, but arranged arbitrarily and can be connected via pressure lines.
  • engine oil is preferably used for the valve control unit, in which, depending on the load situation of the internal combustion engine, a relatively large amount of air is contained, it is proposed according to the invention to provide corresponding ventilation devices.
  • a quick-release valve is fitted to the high-pressure accumulator.
  • the trained as a "common rail high-pressure accumulator is so, z. B. installed at an angle, that the quick-acting valve is located at the highest point, preferably at the highest end to ensure safe ventilation.
  • FIG. 1 shows a plan view of a fully variable hydraulic valve control unit
  • FIG. 1 a side view of a valve control unit according to Figure 1 and a section through the valve control unit according to the line III-III in Figure 1.
  • 1 generally designates a high-pressure pump which has a punch and a roller tappet 2 which is in operative connection with a plurality of cams of a cam disk 3 of a camshaft.
  • the high-pressure pump 1 is arranged by means of a flange 4 Brennkraftmaschinenfest, so that the connected to the flange 4 pump head 5 is fixed.
  • On the pump head 5 an inlet nozzle 6 and a high-pressure nozzle 7 is mounted, wherein the high-pressure nozzle 7 is connected by means of a high-pressure line 8 with a high-pressure accumulator 9 and supplies it by means of hydraulic pressure fluid.
  • the high-pressure accumulator 9 is designed as a cylindrical pressure tube and thus corresponds to a "common rail" in injection systems
  • a pressure accumulator capsule 10 which compensates for pressure fluctuations in the system is mounted on the high-pressure accumulator 9.
  • Electrically or electromagnetically actuated hydraulic switching valves 11 are attached to the high-pressure accumulator 9.
  • High pressure branches 12 are attached to the switching valves 11 and lead to a housing unit 13.
  • the housing unit is adapted to the position and number of a number of gas exchange valves of the reciprocating internal combustion engine, so that various housing units are available can be made, which are designed for different numbers of gas exchange valves of reciprocating internal combustion engine and also consider whether only one or more intake or exhaust valves are provided per cylinder of the reciprocating internal combustion engine.
  • the housing unit can also be arbitrarily divided and ultimately divided so that a small unit is provided at each gas exchange valve, since the system is fully variable.
  • a hydraulic brake 13a with slave unit 13b is installed in the housing unit 13 per gas exchange valve.
  • a slave unit 13b it is also conceivable for a slave unit 13b to be designed for a plurality of gas exchange valves and to be used e.g. this is operated via a bridge.
  • the housing unit 13 To the housing unit 13 are also electrically or electromagnetically controlled hydraulic shut-off valves 14, which are also designed as two-way quick-acting valves and the pressure chambers of the hydraulic brakes 13a and slave units 13b dominate in the sense that they either complete the pressure chambers or this connect with discharge lines.
  • the discharge lines lead into the free space on the cylinder head of the reciprocating internal combustion engine. Since over the high-pressure pump 1 always sufficient pressure in the high-pressure accumulator 9 is present, the opening of the or the respective gas exchange valves by opening the switching valves 1 1 takes place at the time scheduled for the reciprocating internal combustion engine, the opening time of the switching valves 1 1 determines the lifting height.
  • the or the Abersonventile 14 is controlled in adaptation to the respective closing time of the gas exchange valves or the 14 so that they open the pressure chamber of the hydraulic brakes 13a and slave units 13b and close by discharging the hydraulic fluid or the respective gas exchange valves.
  • the details of the hydraulic brakes 13a with slave units 13b will not be described in detail here, since they are already used in the prior art valve control unit. LIST OF REFERENCE NUMBERS

Abstract

Unité de commande de soupape hydraulique entièrement variable destinée aux soupapes d'échange gazeux de moteurs à combustion interne à pistons alternatifs, notamment à des moteurs à plusieurs cylindres, comprenant : au moins une unité de production de pression entraînée par le moteur à combustion interne; au moins un frein hydraulique (13a) présentant une unité réceptrice (13b) pour commander les soupapes d'échange gazeux; au moins une soupape de commande (11) hydraulique de préférence commandée électriquement; au moins une chambre haute pression qui est en liaison active avec l'unité de production de pression; et une unité boîtier (13) qui peut être reliée à une culasse du moteur à combustion interne à pistons alternatifs et qui loge les freins hydrauliques (13a) et les unités réceptrices (13b). Selon l'invention, l'unité de commande de soupape présente trois unités structurales indépendantes qui, selon les exigences du moteur à combustion interne, peuvent être modifiées et combinées, et l'unité de production de pression réalisée en tant qu'une unité structurale, se présente sous la forme d'au moins une pompe haute pression (1) qui est commandée indépendamment des temps de commande des soupapes d'échange gazeux et est reliée à la chambre haute pression au moyen d'une ligne haute pression (8).
PCT/EP2013/050201 2012-01-12 2013-01-08 Unité de commande de soupape hydraulique entièrement variable destinée aux soupapes d'échange gazeux de moteurs à combustion interne à pistons alternatifs, notamment à des moteurs à plusieurs cylindres WO2013104612A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012200366.5 2012-01-12
DE102012200366A DE102012200366A1 (de) 2012-01-12 2012-01-12 Vollvariable hydraulische Ventilsteuereinheit für Gaswechselventile von Hubkolbenbrennkraftmaschinen, insbesondere mehrzylindrischen Maschinen

Publications (1)

Publication Number Publication Date
WO2013104612A1 true WO2013104612A1 (fr) 2013-07-18

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PCT/EP2013/050201 WO2013104612A1 (fr) 2012-01-12 2013-01-08 Unité de commande de soupape hydraulique entièrement variable destinée aux soupapes d'échange gazeux de moteurs à combustion interne à pistons alternatifs, notamment à des moteurs à plusieurs cylindres

Country Status (2)

Country Link
DE (1) DE102012200366A1 (fr)
WO (1) WO2013104612A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0726923A (ja) * 1993-07-07 1995-01-27 Zexel Corp 内燃機関のバルブ制御装置
WO1997006355A1 (fr) * 1995-08-08 1997-02-20 Diesel Engine Retarders, Inc. Moteurs a combustion interne a commande combinee de came et de soupape electro-hydaulique
WO2001020150A1 (fr) * 1999-09-17 2001-03-22 Diesel Engine Retarders, Inc. Accumulateur a volume captif pour systeme a perte de mouvement
DE102006008676A1 (de) * 2006-02-24 2007-08-30 Schaeffler Kg Zylinderkopf einer Brennkraftmaschine mit elektrohydraulischer Ventilsteuerung
EP1832722A2 (fr) * 2006-03-06 2007-09-12 Delphi Technologies, Inc. Régleur de jeu de soupape doté d'une capacité de déplacement à vide électro-hydraulique
EP2226477A1 (fr) * 2009-03-05 2010-09-08 Schaeffler Technologies AG & Co. KG Unité hydraulique pour culasse de moteur à combustion interne dotée d'une commande hydraulique variable de soupape
US20100326384A1 (en) * 2009-06-30 2010-12-30 Francesco Vattaneo Electronically controlled hydraulic system for variable actuation of the valves of an internal combustion engine, with fast filling of the high pressure side of the system
DE102009043649A1 (de) * 2009-09-29 2011-03-31 Schaeffler Technologies Gmbh & Co. Kg Hydraulischer Ventiltrieb einer Brennkraftmaschine
EP2381075A2 (fr) * 2010-04-26 2011-10-26 Schaeffler Technologies AG & Co. KG Unité hydraulique pour une tête de cylindre d'un moteur à combustion interne dotée d'une commande de soupape hydraulique variable à échange de gaz

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4741307A (en) * 1987-02-17 1988-05-03 Pacific Diesel Brave Co. Apparatus and method for compression release retarding of an engine

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0726923A (ja) * 1993-07-07 1995-01-27 Zexel Corp 内燃機関のバルブ制御装置
WO1997006355A1 (fr) * 1995-08-08 1997-02-20 Diesel Engine Retarders, Inc. Moteurs a combustion interne a commande combinee de came et de soupape electro-hydaulique
WO2001020150A1 (fr) * 1999-09-17 2001-03-22 Diesel Engine Retarders, Inc. Accumulateur a volume captif pour systeme a perte de mouvement
DE102006008676A1 (de) * 2006-02-24 2007-08-30 Schaeffler Kg Zylinderkopf einer Brennkraftmaschine mit elektrohydraulischer Ventilsteuerung
EP1832722A2 (fr) * 2006-03-06 2007-09-12 Delphi Technologies, Inc. Régleur de jeu de soupape doté d'une capacité de déplacement à vide électro-hydraulique
EP2226477A1 (fr) * 2009-03-05 2010-09-08 Schaeffler Technologies AG & Co. KG Unité hydraulique pour culasse de moteur à combustion interne dotée d'une commande hydraulique variable de soupape
DE102009011983A1 (de) 2009-03-05 2010-09-09 Schaeffler Technologies Gmbh & Co. Kg Hydraulikeinheit für einen Zylinderkopf einer Brennkraftmaschine mit hydraulisch variablem Gaswechselventiltrieb
US20100326384A1 (en) * 2009-06-30 2010-12-30 Francesco Vattaneo Electronically controlled hydraulic system for variable actuation of the valves of an internal combustion engine, with fast filling of the high pressure side of the system
DE102009043649A1 (de) * 2009-09-29 2011-03-31 Schaeffler Technologies Gmbh & Co. Kg Hydraulischer Ventiltrieb einer Brennkraftmaschine
EP2381075A2 (fr) * 2010-04-26 2011-10-26 Schaeffler Technologies AG & Co. KG Unité hydraulique pour une tête de cylindre d'un moteur à combustion interne dotée d'une commande de soupape hydraulique variable à échange de gaz

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