EP1479879A1 - Dispositif électromagnétique de soupape avec circuit de courants de Foucault pour arrêtement passif du rotor - Google Patents

Dispositif électromagnétique de soupape avec circuit de courants de Foucault pour arrêtement passif du rotor Download PDF

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Publication number
EP1479879A1
EP1479879A1 EP04008732A EP04008732A EP1479879A1 EP 1479879 A1 EP1479879 A1 EP 1479879A1 EP 04008732 A EP04008732 A EP 04008732A EP 04008732 A EP04008732 A EP 04008732A EP 1479879 A1 EP1479879 A1 EP 1479879A1
Authority
EP
European Patent Office
Prior art keywords
electromagnet
armature
current circuit
anchor
eddy current
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
EP04008732A
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German (de)
English (en)
Other versions
EP1479879B1 (fr
EP1479879B2 (fr
Inventor
Helmut Dr. Kellermann
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=33039171&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1479879(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP1479879A1 publication Critical patent/EP1479879A1/fr
Publication of EP1479879B1 publication Critical patent/EP1479879B1/fr
Application granted granted Critical
Publication of EP1479879B2 publication Critical patent/EP1479879B2/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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • 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
    • F01L9/40—Methods of operation thereof; Control of valve actuation, e.g. duration or lift
    • F01L2009/409—Determination of valve speed

Definitions

  • the present invention relates to an electric valve train for internal combustion engines according to the preamble of claim 1.
  • Such a valve train is known from DE 197 22 632 A1.
  • the valves are powered by a motor driven by the crankshaft Mechanically controlled camshaft.
  • electric controlled valve trains researched, as this a higher power yield promise low fuel consumption.
  • two basic variants namely so-called stroke actuators, in which the actuators for valve control are actuated by electromagnets and So-called rotary actuators, in which a cam is used to actuate the valve acting electric motor is provided.
  • Electric valve drives with Lift actuators are provided with an axially displaceable armature, which is an armature plate having.
  • a problem with such stroke actuators is that the armature is tightened an electromagnet at a relatively high speed on the attracting Electromagnet strikes. For reasons of acoustics and driving comfort, it is but absolutely necessary that the anchor plate touches down as gently as possible. Though one tries to control the electromagnets accordingly placing the anchor plate on the attracting electromagnet as gently as possible to reach.
  • the control of the armature movement is control engineering so far very difficult to control.
  • a motor requires an expensive sensor to measure armature movement, which must have a high path resolution and a large signal bandwidth. High computing power is also required for the valve control, a Sensor evaluation electronics, shielded wiring of the sensors as well controller parameterization tailored to the respective stroke actuators. All this is associated with high costs.
  • the object of the invention is therefore to provide an electric valve train with a To create stroke actuator in which the speed of the armature shortly before Impact of the anchor plate is reduced in a technically simple manner and the effort for regulating or controlling the armature movement is reduced accordingly.
  • the starting point of the invention is a working according to the stroke actuator principle electric valve train.
  • the valve train has a displaceably arranged Anchor with an anchor plate.
  • the anchor plate is between a first and arranged a second electromagnet.
  • a magnetic field can be generated that moves the armature into one or another direction.
  • the essence of the invention is that at least one in the magnetic field area the electromagnet an "eddy circuit" is provided.
  • Eddy current circuit becomes associated with the movement of the armature Electromagnets induce an eddy current.
  • the eddy current is a magnetic vortex field (magnetic field) that is the cause of its Origin, namely the change in the magnetic flux in the magnetic circuit, counteracts.
  • the anchor becomes vortex field shortly before the anchor plate hits the associated electromagnets wear-free at a lower speed braked.
  • the eddy current circuit thus creates one that acts on the armature "Braking force".
  • the Anchor movement then active by appropriate control or regulation of the Coil currents of the electromagnets are controlled or regulated. Since the The speed of the anchor is lower in this last phase before touchdown than in the prior art, the subsequent control or regulation is the Technically easier to control anchor movement.
  • the magnetic field lines always run in closed paths (Freedom of source of the magnetic field) exist with regard to the arrangement of the Eddy current circuit certain freedoms. It is essential that the eddy circuit so is arranged so that it includes the maximum magnetic flux as possible.
  • the eddy current circuit is directly on the Coil of the associated electromagnet arranged.
  • a "switch element" is preferably provided in the eddy current circuit Eddy currents can only flow in a given current direction and that in the blocks opposite current direction. This has the advantage of being the anchor only when moving towards the electromagnet by eddy currents is braked and a detachment of the armature plate from the electromagnet, the would in principle also cause eddy currents, is not hindered. Without such a switch element would namely when the anchor plate is detached Eddy currents are induced in the eddy circuit by the electromagnet. This Eddy currents would shift the armature when detached from Counteract electromagnets. The removal process would be relatively slow. Around To prevent this, preferably an eddy circuit with a switch element used, the current flows only in one direction.
  • the switch element is preferably a diode. It is important that the Diode is switched so that when the armature plate approaches the Electromagnets eddy currents can flow in the eddy circuit and when detaching The armature plate from the electromagnet blocked eddy currents through the diode become.
  • the eddy current circuit is a "short-circuit ring" educated.
  • the short-circuit ring can be a flat, plate-shaped, slotted, ring-shaped component, the ends of which are electrically connected to one another via the diode are connected.
  • the diode can be used together with the coil of the electromagnet and the short-circuit ring be installed.
  • the loss voltage across the diode due to the junction voltage of the semiconductor material is always the same, it lends itself to the Short circuit ring made of several turns (short circuit coil), because with it the current is reduced, but the voltage across the diode remains the same and therefore the power loss in the diode is reduced.
  • Each of the two electromagnets is preferably a separate eddy current circuit assigned.
  • the implementation of the invention is simple and inexpensive and according to today's Knowledge lasts.
  • the magnetic circuit is not through the eddy current circuit, at least not significantly influenced.
  • the arrangement of an eddy circuit the electromagnet takes up little or no additional space.
  • On The advantage over conventional stroke actuators is that the sensor for Sensing the armature movement can be omitted or the requirements on the Sensor can be reduced because the anchor plate is passive through the eddy circuit is braked. This reduces the requirements for the required Computing power of the control unit, which saves costs for the entire system.
  • FIGs 1 and 2 show an electromagnetic valve train 1 with an armature, which is formed by an anchor shaft 2 and an anchor plate 3.
  • the anchor is with its anchor plate 3 axially displaceable between two electromagnets 4, 5 arranged, which are shown only schematically here.
  • the Electromagnet 4 becomes the armature from the central or neutral position shown in FIG. 1 moved upwards in the direction of arrow 6.
  • the Electromagnet 5 By energizing the Electromagnet 5, the armature is directed in the opposite direction of arrow 7 shifted.
  • the anchor or the anchor shaft acts on one to be controlled Valve (not shown) of the internal combustion engine.
  • Each of the two Electromagnets 4, 5 have a magnet or excitation coil 8.
  • FIG. 1 is the Situation shown that the electromagnet 4 is switched off and the electromagnet 5 is excited, which is indicated by magnetic field lines 9.
  • the magnet 5 thus pulls the anchor straight on, whereby the anchor or the anchor plate 3 in the direction of Electromagnet 5 is pulled.
  • Figure 2 shows a position of the armature just before placing the anchor plate 3 on the magnet 5.
  • an "eddy current circuit" on the electromagnet 5 is provided in the form of a short-circuit ring 10, which better from the Figures 3 and 4 can be seen.
  • FIG. 3 shows a perspective view of the electromagnet 5.
  • the electromagnet 5 has a yoke or an iron core 11 with a central leg 12 and two outer legs 13, 14. On the middle leg 12 is the Excitation coil or excitation winding 8 of the electromagnet 8 arranged, which has two electrical connections 15, 16.
  • the plate-shaped short-circuit ring 10 On the middle section 12 of the yoke 11 or on the excitation coil 8 is the plate-shaped short-circuit ring 10 arranged.
  • Figure 4 shows a preferred embodiment of the short-circuit ring 10.
  • Der Short-circuit ring 10 has a slot 17.
  • the two legs 18, 19 of the Short-circuit ring 10 are via electrical lines 20, 21 and a diode 22 electrically connected to each other.
  • the short circuit ring 10, the electrical Lines 20, 21 and the diode 22 form an eddy circuit. It is essential that in the "eddy current circuit” eddy currents only flow in one direction can and blocked in the opposite current direction by the diode 22 are.
  • the diode 22 is designed so that when the armature or Anchor plate (see FIGS. 1, 2) eddy currents flow onto the electromagnet 5 can.
  • the eddy currents create an induction field that corresponds to the armature movement counteracts and brakes the anchor.
  • electromagnets 5 When lifting the anchor plate from In principle, electromagnets 5 would also induce eddy currents, because the magnetic flux also changes when taking off. These eddy currents would move into the opposite due to the opposite anchor movement Flow towards. A current flow in the short-circuit ring 10 in the opposite However, direction is blocked by diode 22.
  • diode 22 prevents to lift the Armature or the armature plate from the electromagnet an emergence of Eddy currents in the eddy circuit 10, i.e. a "sticking" of the anchor plate prevented.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Electromagnets (AREA)
EP04008732A 2003-05-10 2004-04-13 Dispositif électromagnétique de soupape avec circuit de courants de Foucault pour arrêtement passif du rotor Expired - Lifetime EP1479879B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10321036A DE10321036A1 (de) 2003-05-10 2003-05-10 Elektrischer Ventiltrieb mit Kurzschlussring
DE10321036 2003-05-10

Publications (3)

Publication Number Publication Date
EP1479879A1 true EP1479879A1 (fr) 2004-11-24
EP1479879B1 EP1479879B1 (fr) 2005-10-12
EP1479879B2 EP1479879B2 (fr) 2009-09-23

Family

ID=33039171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04008732A Expired - Lifetime EP1479879B2 (fr) 2003-05-10 2004-04-13 Dispositif électromagnétique de soupape avec circuit de courants de Foucault pour arrêtement passif du rotor

Country Status (2)

Country Link
EP (1) EP1479879B2 (fr)
DE (2) DE10321036A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009095125A1 (fr) * 2008-01-30 2009-08-06 Robert Bosch Gmbh Procédé pour la commande d'électrovannes
WO2016139176A1 (fr) * 2015-03-05 2016-09-09 Continental Automotive Gmbh Dispositif comprenant un moteur électrique pourvu d'un rotor magnétique doux et dispositif comprenant au moins un induit, fait d'un matériau magnétique doux, d'un actionneur magnétique

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19722632A1 (de) * 1997-05-30 1998-12-03 Schaeffler Waelzlager Ohg Antrieb zur periodischen Beaufschlagung wenigstens eines Ventils
US5868108A (en) * 1996-12-13 1999-02-09 Fev Motorentechnik Gmbh & Co. Kg Method for controlling an electromagnetic actuator operating an engine valve
EP0959479A2 (fr) * 1998-04-28 1999-11-24 Siemens Automotive Corporation Procédé de régulation pour la vitesse de l'armature d'un actionneur électromagnétique
WO2000028192A1 (fr) * 1998-11-06 2000-05-18 Siemens Automotive Corporation Procede de compensation pour commande de flux d'un actionneur electromagnetique
EP1073183A2 (fr) * 1999-07-29 2001-01-31 Isuzu Motors Limited Dispositif de ralentissement à courant de Foucault
US6373678B1 (en) * 1999-05-03 2002-04-16 Fev Motorentechnik Gmbh Method of regulating the armature impact speed in an electromagnetic actuator by controlling the current supply based on performance characteristics
US6427651B1 (en) * 1999-05-27 2002-08-06 Fev Motorentechnik Gmbh Method for controlling the final position of a gas exchange valve actuated by an electromagnetic actuator in an internal combustion piston engine
US6499447B2 (en) * 2000-03-16 2002-12-31 Bayerische Motoren Werke Aktiengesellschaft Process for operating an electromagnetic actuator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4244247A1 (de) * 1992-12-24 1994-07-07 Kuhnke Gmbh Kg H Elektromagnetische Anordnung
DE29703585U1 (de) † 1997-02-28 1998-06-25 Fev Motorentech Gmbh & Co Kg Elektromagnetischer Aktuator mit magnetischer Auftreffdämpfung
JP3935008B2 (ja) * 2002-07-16 2007-06-20 本田技研工業株式会社 エンジンの動弁装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5868108A (en) * 1996-12-13 1999-02-09 Fev Motorentechnik Gmbh & Co. Kg Method for controlling an electromagnetic actuator operating an engine valve
DE19722632A1 (de) * 1997-05-30 1998-12-03 Schaeffler Waelzlager Ohg Antrieb zur periodischen Beaufschlagung wenigstens eines Ventils
US5884591A (en) * 1997-05-30 1999-03-23 Ina Walzlager Schaeffler Ohg Drive mechanism for periodically moving at least one valve
EP0959479A2 (fr) * 1998-04-28 1999-11-24 Siemens Automotive Corporation Procédé de régulation pour la vitesse de l'armature d'un actionneur électromagnétique
WO2000028192A1 (fr) * 1998-11-06 2000-05-18 Siemens Automotive Corporation Procede de compensation pour commande de flux d'un actionneur electromagnetique
US6373678B1 (en) * 1999-05-03 2002-04-16 Fev Motorentechnik Gmbh Method of regulating the armature impact speed in an electromagnetic actuator by controlling the current supply based on performance characteristics
US6427651B1 (en) * 1999-05-27 2002-08-06 Fev Motorentechnik Gmbh Method for controlling the final position of a gas exchange valve actuated by an electromagnetic actuator in an internal combustion piston engine
EP1073183A2 (fr) * 1999-07-29 2001-01-31 Isuzu Motors Limited Dispositif de ralentissement à courant de Foucault
US6499447B2 (en) * 2000-03-16 2002-12-31 Bayerische Motoren Werke Aktiengesellschaft Process for operating an electromagnetic actuator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009095125A1 (fr) * 2008-01-30 2009-08-06 Robert Bosch Gmbh Procédé pour la commande d'électrovannes
WO2016139176A1 (fr) * 2015-03-05 2016-09-09 Continental Automotive Gmbh Dispositif comprenant un moteur électrique pourvu d'un rotor magnétique doux et dispositif comprenant au moins un induit, fait d'un matériau magnétique doux, d'un actionneur magnétique

Also Published As

Publication number Publication date
EP1479879B1 (fr) 2005-10-12
EP1479879B2 (fr) 2009-09-23
DE10321036A1 (de) 2004-11-25
DE502004000098D1 (de) 2005-11-17

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