EP0975856A1 - Dispositif de commande hydraulique pour au moins une soupape de cylindre - Google Patents

Dispositif de commande hydraulique pour au moins une soupape de cylindre

Info

Publication number
EP0975856A1
EP0975856A1 EP98917027A EP98917027A EP0975856A1 EP 0975856 A1 EP0975856 A1 EP 0975856A1 EP 98917027 A EP98917027 A EP 98917027A EP 98917027 A EP98917027 A EP 98917027A EP 0975856 A1 EP0975856 A1 EP 0975856A1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
control device
hydraulically
control
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
EP98917027A
Other languages
German (de)
English (en)
Other versions
EP0975856B1 (fr
Inventor
Ulrich Letsche
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
DaimlerChrysler 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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP0975856A1 publication Critical patent/EP0975856A1/fr
Application granted granted Critical
Publication of EP0975856B1 publication Critical patent/EP0975856B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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

Definitions

  • H y draulic control device for at least one _ ___ ⁇ _ ⁇ »_ I
  • the invention relates to a hydraulic control device for at least one lift valve according to the preamble of patent claim 1.
  • a valve control which articulates a linearly movable lift valve. It comprises a valve stem on which a helical compression spring acts in the valve closing direction and at times an oil pressure spring in the valve opening direction. It also comprises a control piston which is fixedly connected to the valve stem, is arranged in a working space and can be acted upon by a working fluid and in the area of its end positions partially delimits a diving space belonging to the working space and which can be hydraulically separated from it. If the control piston is immersed in one of its diving rooms, i.e. if it is in the area of its end position, the diving space is relieved of pressure, whereby the pressure in the working space stabilizes this valve position. However, if the control piston and thus the valve stem remain in an undefined middle position as a result of a malfunction, resetting and switching off this malfunction is only possible with great effort.
  • the object of the present invention is to provide a control device of the type mentioned at the beginning with which malfunctions can be compensated for by simple means.
  • the object is achieved by the features mentioned in the characterizing part of claim 1. This ensures that the pressure of the second, hydraulically controllable spring means can be lowered separately and quickly to such an extent that the pressure force of the first spring means outweighs that of the " second, hydraulically controllable spring means.
  • a reset movement of the same can thus be triggered by actuation of the auxiliary control member,
  • the auxiliary control element can be actuated directly together with the actuation of the actuator or indirectly through the actuation of the actuator and the resulting actuation process.
  • this can be mechanical, electronic, electrical, electromagnetic or pneumatic, in the latter case, however, the control is preferably carried out via the same actuator which enables the control piston to be controlled.
  • auxiliary control member has a 2/2-way valve function. This function can be implemented within the framework of the existing hydraulic system by particularly simple means.
  • auxiliary control member is connected via control lines to a pressure supply line and a pressure relief line which can be acted upon by the actuator.
  • FIG. 1 shows an embodiment of a hydraulic control device according to the invention for a linearly movable lift valve of an internal combustion engine with a helical compression spring acting in the valve closing direction and a combination of a valve spring acting in the valve opening direction. ner coil and an oil pressure spring in a closed position of the lift valve,
  • FIG. 2 shows the control device according to FIG. 1 in a central position of the lift valve
  • Fig. 3 shows the control device of FIG. 1 in its central position, but with the reset movement of the lift valve triggered
  • FIG. 4 shows the control device according to FIG. 1 in a representation with the lift valve fully open (lower end position).
  • An internal combustion engine in particular for driving a motor vehicle, has, in a manner known per se, a plurality of cylinders, the combustion chambers of which are each provided with at least one lift valve for supplying a fuel / air mixture or for removing the exhaust gas.
  • the lift valves are controlled by motor electronics serving as the central control unit. 1 to 4, a hydraulic control device described in more detail below is provided for actuating each lift valve 1.
  • Each lift valve 1 has a valve stem 2 and a spring receptacle 3 firmly connected to it.
  • the valve stem 2 is acted upon via the spring receptacle 3 by a prestressed compression spring 4 serving as the first spring means in the valve closing direction with a force which holds the lift valve 1 in its rest position shown in FIG. 1.
  • the valve stem 2 is linearly displaceably mounted with a piston region in a cylinder guide 5, which is part of a housing 6.
  • the cylinder guide 5 is widened at one point to a working space 33 which is penetrated by the piston area of the valve stem 2, the piston area in the working space 33 opening up a control piston 7 which is integrally connected to the valve stem 2 in the exemplary embodiment shown. points.
  • the control piston 7 comprises a lower and an upper plunger 8 and 9, each of which plunges into pressure chambers 34 and 35 in the region of an end position of the valve stem 2.
  • the pressure chambers 34, 35 are designed such that they are hydraulically separated from the remaining volume of the working chamber 33 by the plungers 8 and 9 in the end positions of the valve stem 2.
  • the work space is part of a hydraulic system described in more detail below, the pressure of which is controlled by at least one hydraulic pump (not shown) by corresponding supply lines 38 serving to build up pressure and by a return line 39 serving to relieve pressure.
  • the pressure build-up and the pressure relief in the hydraulic system are also controlled by means of an electromagnetic switching valve 46 serving as an actuator, which is actuated in a merely indicated manner by corresponding switching signals from the motor electronics.
  • a total of five ring channels 22, 24, 27, 29, 31 are provided over the length of the piston area, four ring channels 22, 24, 27, 29 above the control piston 7 and thus Above the working space 33 and another ring channel 31 are arranged below the working space 33.
  • the ring channel 22 is connected directly to the supply line 38, while the ring channels 29 and 31 can be connected either to the further supply line 38 or to the return line 39 via connecting lines 30, 32 and a soft-shaped branch of the electromagnetic switching valve 46.
  • the ring channel 27 is connected to a control slide 40 via a control line 28 for controlling an auxiliary control element in the form of a 2/2 way valve.
  • the annular channel 24 closes on the one hand via a connecting line to the return line 39 and on the other hand via a control line 26 to a working space of the control slide 40 of the 2/2-way valve 37 on.
  • the work space 33 is connected to the supply line 38 via a connecting line 36.
  • a pressure chamber 20 adjoins the cylinder guide 5, which is connected via a line 21 to a further hydraulic volume 43.
  • Pressure chamber 20 and hydraulic volume 43 together form an oil pressure spring, which is connected in series with a helical compression spring 45, which presses the hydraulic volume 43 via a cylinder 44.
  • the structure and function of this hydraulic unit correspond to a hydraulic control device, as described in the unpublished German patent application 196 21 951.5, so that reference is made to the disclosure in this patent application for further explanations.
  • the spring means designed in this way loads the valve stem 2 in the valve opening direction, the pressure chamber 20 simultaneously forming a displacement for the valve stem 2.
  • the pressure chamber 20 can be connected to the working chamber via channels 11 and 14, which run coaxially in the piston region of the valve stem 2, and from there via the connecting line 36 designed as a pressure line to the supply line 38, in that a ball 17 mounted in an extension 19 of the channel 11 passes through a sufficient gradient between the pressure of the oil pressure spring and the current supply pressure against the force of a preloaded compression spring 18 and the supply pressure on the underside of the ball is deflected from its rest position shown in the drawings. This is the case if the supply pressure is greatly reduced when the valve is not fully extended. As explained, the oil pressure spring is relaxed to the supply pressure, whereupon the valve closes due to the force of the helical compression spring 4.
  • the piston area of the valve stem 2 and the control piston 7 move during a working cycle back and forth between two end positions.
  • the pressure chambers 34 or 35 which are separated from the working chamber 33 by the plungers 8 or 9, can alternatively be connected to the annular channels 29, 31 by grooves 15, 16 provided in the piston region "of the valve stem 2 above and below the control piston 7 1 shows the position of the valve stem 2 and its piston area in an upper end position, in which the pressure chamber 35 acts via the groove 16 and the connecting line 30, is relieved of pressure in the state shown and its piston region in the opposite, lower end position, in which the pressure chamber 34 acts via the groove 15 and the pressure line 32, is depressurized in the state shown.
  • the pressure-relieved pressure chamber 34 or 35 can be acted upon by a changeover of the switching valve 46 with the supply pressure, so that with appropriate dimensioning of the force relationships, the globe valve from its upper end position by the pressure of the oil pressure spring on the end face 2 'and from it lower end position is moved by the pressure of the compression spring 4 on the spring holder 3.
  • valve stem 2 is moved to the opposite end position after the movement has been triggered by the respectively more tensioned spring means.
  • the mode of operation corresponds to the function of the control devices, as in the DE 195 01 495 Cl or DE 196 21 951.5 are described. Pressure is applied via the ring channel 22 in the cylinder guide 5 and an annular groove 13 serving as a control groove, and control channels 11, 12 in the piston area of the valve stem 2.
  • an auxiliary control element is assigned to the pressure chamber 20, which is formed by a 2/2-way valve with a working chamber 37 and a control slide 40, a control line 28, a return spring 41 and a connecting line 26.
  • the pressure chamber 20 and the working space 37 for the control slide 40 are hydraulically connected to one another, but the connection in the rest position of the control slide 40 is interrupted by the latter.
  • the return spring 41 is largely relaxed, the control line 28 is relieved of pressure.
  • the connecting line 26 is relieved of pressure in any situation, since it is in permanent connection with the connecting line 25 via the ring channel 24.
  • the valve stem 2 is in an undefined medium would be according to FIG.
  • the activated auxiliary control member releases the connection between the pressure chamber 20 and the connecting line 26, whereby the oil pressure spring is relieved of pressure and the piston region of the valve stem 2 is pushed back from its central position by the compression spring 4 into the end position according to FIG. 1 . If the lift valve 1 has reached its upper end position, the hydraulic connection between the ring channels 27 and 29 via the control groove 10 no longer exists, but rather a connection of the ring channels 27 and 24 now relieves the pressure in the control line 28 and thus resets the control slide 40 in its rest position ensured by the force of the compression spring 41.

Landscapes

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

Abstract

L'invention concerne un dispositif de commande hydraulique destiné à au moins une soupape de cylindre (1), qui comporte une tige à soupape (2) pouvant être déplacée par deux ressorts agissant en sens opposés, la tige à soupape (2) étant commandée hydrauliquement dans la zone de ses positions extrêmes. Selon l'invention, le dispositif de commande hydraulique comporte un ensemble ressort (20, 43) à régulation hydraulique auquel est affecté un organe de commande auxiliaire (37, 40, 41) agissant hydrauliquement, au moyen duquel le liquide de travail de l'ensemble ressort (20, 43) peut être détendu.
EP98917027A 1997-04-17 1998-03-20 Soupape avec dispositif de commande hydraulique Expired - Lifetime EP0975856B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19716042 1997-04-17
DE19716042A DE19716042C1 (de) 1997-04-17 1997-04-17 Hydraulische Steuervorrichtung für wenigstens ein Hubventil
PCT/EP1998/001630 WO1998048151A1 (fr) 1997-04-17 1998-03-20 Dispositif de commande hydraulique pour au moins une soupape de cylindre

Publications (2)

Publication Number Publication Date
EP0975856A1 true EP0975856A1 (fr) 2000-02-02
EP0975856B1 EP0975856B1 (fr) 2001-12-19

Family

ID=7826782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98917027A Expired - Lifetime EP0975856B1 (fr) 1997-04-17 1998-03-20 Soupape avec dispositif de commande hydraulique

Country Status (5)

Country Link
US (1) US6167853B1 (fr)
EP (1) EP0975856B1 (fr)
JP (1) JP3348201B2 (fr)
DE (2) DE19716042C1 (fr)
WO (1) WO1998048151A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19853355C1 (de) * 1998-11-19 2000-08-31 Daimler Chrysler Ag Hydraulisch steuerbares Hubventil
DE10124869C2 (de) 2001-05-22 2003-06-26 Caterpillar Motoren Gmbh & Co Hydraulische Steuereinrichtung für gleichwirkende Motorventile eines Dieselmotors
JP2004197588A (ja) * 2002-12-17 2004-07-15 Mitsubishi Motors Corp 内燃機関の動弁装置
GB2423794B (en) 2005-03-01 2008-09-10 Ford Global Tech Llc An internal combustion engine having cylinder disablement and gas recirculation
US7302920B2 (en) * 2005-06-16 2007-12-04 Zheng Lou Variable valve actuator
US7156058B1 (en) * 2005-06-16 2007-01-02 Zheng Lou Variable valve actuator
US7290509B2 (en) * 2005-08-01 2007-11-06 Zheng Lou Variable valve actuator
US7370615B2 (en) * 2005-08-01 2008-05-13 Lgd Technology, Llc Variable valve actuator
US7766302B2 (en) * 2006-08-30 2010-08-03 Lgd Technology, Llc Variable valve actuator with latches at both ends
US8978604B2 (en) 2012-03-31 2015-03-17 Jiangsu Gongda Power Technologies Co., Ltd. Variable valve actuator

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3836725C1 (fr) * 1988-10-28 1989-12-21 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De
US5193495A (en) * 1991-07-16 1993-03-16 Southwest Research Institute Internal combustion engine valve control device
US5221072A (en) 1992-01-14 1993-06-22 North American Philips Corporation Resilient hydraulic actuator
DE19501495C1 (de) * 1995-01-19 1995-11-23 Daimler Benz Ag Hydraulische Ventilsteuervorrichtung
JP3368518B2 (ja) * 1995-06-30 2003-01-20 三菱自動車工業株式会社 多段開度弁装置
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
DE19621951C1 (de) * 1996-05-31 1997-07-10 Daimler Benz Ag Hydraulische Venbtilsteuervorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9848151A1 *

Also Published As

Publication number Publication date
DE59802536D1 (de) 2002-01-31
JP2000515605A (ja) 2000-11-21
DE19716042C1 (de) 1998-05-07
EP0975856B1 (fr) 2001-12-19
US6167853B1 (en) 2001-01-02
JP3348201B2 (ja) 2002-11-20
WO1998048151A1 (fr) 1998-10-29

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