EP1840341B1 - Elektromagnetisch angetriebenes Ventil und dessen Ansteuerungsverfahren - Google Patents

Elektromagnetisch angetriebenes Ventil und dessen Ansteuerungsverfahren Download PDF

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Publication number
EP1840341B1
EP1840341B1 EP07013997A EP07013997A EP1840341B1 EP 1840341 B1 EP1840341 B1 EP 1840341B1 EP 07013997 A EP07013997 A EP 07013997A EP 07013997 A EP07013997 A EP 07013997A EP 1840341 B1 EP1840341 B1 EP 1840341B1
Authority
EP
European Patent Office
Prior art keywords
valve
electromagnetically driven
driven valve
oscillating member
temperature
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.)
Expired - Fee Related
Application number
EP07013997A
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English (en)
French (fr)
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EP1840341A2 (de
EP1840341A3 (de
Inventor
Masahiko Asano
Yutaka Sugie
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of EP1840341A2 publication Critical patent/EP1840341A2/de
Publication of EP1840341A3 publication Critical patent/EP1840341A3/de
Application granted granted Critical
Publication of EP1840341B1 publication Critical patent/EP1840341B1/de
Expired - Fee Related 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
    • 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
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
    • F01L2009/2105—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids comprising two or more coils
    • F01L2009/2109—The armature being articulated perpendicularly to the coils axes

Definitions

  • the invention generally relates to an electromagnetically driven valve, and more particularly, relates to a pivot-type electromagnetically driven valve that is used for an internal combustion engine and driven by electromagnetic force and elastic force and to a means of driving the same.
  • the electromagnetically driven valve has a problem in that its sliding resistance at low temperature is different from that at high temperature, so that its controllability also varies. Moreover, when variable lift control is used to hold a disc out of contact with a core, if coil current fluctuates due to load-induced fluctuations in battery voltage, it is impossible to control the holding of the electromagnetically driven valve in a stable manner.
  • the invention aims to provide an electromagnetically driven valve that can be driven in a stable manner.
  • the invention relates to an electromagnetically driven valve that is operated by a combined action of electromagnetic force and elastic force.
  • the electromagnetically driven valve includes a valve element that has a valve stem and moves in reciprocating motion in a direction in which the valve stem extends; an oscillating member that is interlocked with the valve element at a driving end, extending to a pivoting end, from which a central axis extends and the oscillating member oscillates around the central axis; a core of an electromagnet that oscillates the oscillating member; and a permanent magnet that is located on the outer side of the driving end of the oscillating member and is positioned in such a way that a magnetic flux passing through the oscillating member and the core becomes greater.
  • the magnetic flux passing through the oscillating member and the core becomes greater, thereby reducing electric power consumption and making the valve less subject to the effects of voltage when the valve is held at an intermediate lift position.
  • an electromagnetically driven valve is provided that improves controllability and ensures stable operation.
  • an electromagnetically driven valve is provided that ensures stable operation.
  • FIG. 1 is a cross-sectional view of an electromagnetically driven valve in accordance with an exemplary embodiment.
  • An electromagnetically driven valve 1 operates by the combined action of electromagnetic force and elastic force.
  • the electromagnetically driven valve 1 includes a valve element 14 that has a valve stem 12 serving as a valve shaft and moves in reciprocal motion in the direction in which the valve stem 12 extends (arrow 10); a disc 30 serving as an oscillating member that is interlocked with the valve element 14 at driving end 32 and that oscillates around an axis 35, located at pivoting end 33; coils 62 and 162 that drive an upper electromagnet 60 and a lower electromagnet 160 that oscillate the disc 30; a power supply 200 that supplies electric current to the coils 62 and 162; and an electronic control unit (ECU) 100 serving as a control portion that controls the flow of electric current from the power supply 200 to the coils 62 and 162.
  • ECU electronice control unit
  • the ECU 100 controls the flow of electric current so that electric current is supplied from the power supply 200 to the coils 62 and 162 in cycles. Specifically, the ECU 100 controls the number of current cycles, the cycle length, and the current value during the initial period of operation in accordance with the voltage and temperature.
  • a U-shaped housing 51 is a base member, and various elements are installed in the housing 51.
  • the upper electromagnet 60 and the lower electromagnet 160 respectively include cores 61 and 161, which are made of magnetic material, and the coils 62 and 162, which are wound around the cores 61 and 161.
  • the flow of electric current to the coils 62 and 162 generates a magnetic field, which drives the disc 30.
  • the disc 30 is arranged between the upper electromagnet 60 and the lower electromagnet 160, and the disc is attracted to either of them by the attraction force of the upper electromagnet 60 and the lower electromagnet 160. This causes the disc 30 to move in reciprocal motion between the upper electromagnet 60 and the lower electromagnet 160.
  • the reciprocal motion of the disc 30 is transmitted to a stem 46 through a long hole 22 and a pin 21.
  • the electromagnetically driven valve 1 in this embodiment constitutes one of an intake valve or exhaust valve in an internal combustion engine such as a gasoline engine and diesel engine.
  • the embodiment section describes the case where a valve element serves as an intake valve fitted to an intake port 18, however this is applicable to a valve element that serves as an exhaust valve.
  • FIG 1 shows the pivot-type electromagnetically driven valve 1.
  • the disc 30 is used as a driving mechanism.
  • the housing 51 is installed on a cylinder head 41; and the lower electromagnet 160 is arranged on the side closer to the cylinder head 41, while the upper electromagnet 60 is arranged on the side farther from the cylinder head 41.
  • the coil 62 which configures the upper electromagnet 60, and the coil 162, which configures the lower electromagnet 160, are connected by a wire 202.
  • the coil 62 is connected to the power supply 200 by a wire 201
  • the coil 162 is connected to the power supply 200 by a wire 203. In other words, the coils 62 and 162 are connected in series to the power supply 200.
  • the disc 30 includes an arm portion 31 and a bearing portion 38, and the arm portion 31 extends from driving end 32 to pivoting end 33.
  • the arm portion 31 is a member that is attracted by the upper electromagnet 60 and the lower electromagnet 160; so that it oscillates (or pivots) in the direction indicated by the arrow 30a.
  • the bearing portion 38 is set at an end of the arm portion 31, and the arm portion 31 pivots around the bearing portion 38. It is possible for the upper surface of the arm portion 31 to come into contact with the upper electromagnet 60, and it is possible for the lower surface of the arm portion 31 to come into contact with the lower electromagnet 160.
  • the bearing portion 38 is cylindrical, and a torsion bar 36 is accommodated therein.
  • a first end of the torsion bar 36 is fitted into the housing 51 by means of a spline fitting, while the other end is fitted into the bearing portion 38 of the disk 30. Consequently, when the bearing portion 38 pivots, a force in the opposite direction to the rotation is transmitted from the torsion bar 36 to the bearing portion 38. Thus a reaction force is constantly applied to the bearing portion 38 in a neutral direction.
  • the stem 46 is provided in such a way that force is imparted to it from the disc 30, and the stem 46 is guided by a stem guide 45. The stem 46 and the disc 30 can oscillate in the direction indicated by the arrow 30a.
  • the housing 51 has a projection 52, and pivoting end 33 of the disk 30 is accommodated therein.
  • a bearing 59 is arranged between the bearing portion 38 and the projection 52 of the housing 51.
  • the intake port 18 is provided in the lower part of the cylinder head 41.
  • the intake port 18 is a passage for the introduction of intake air into a combustion chamber, and either air-fuel mixture or air passes through the intake port 18.
  • a valve seat 42 is provided between the intake port 18 and the combustion chamber, thereby improving the sealability of the valve element 14.
  • the valve element 14 is installed on the cylinder head 41 as an intake valve.
  • the valve element 14 includes the valve stem 12 extending in the longitudinal direction and a bell portion 13 attached at the end of the valve stem 12.
  • the valve stem 12 is guided by a stem guide 43 and is fitted with a spring retainer 19.
  • the spring retainer 19 is energized in the upward direction by a valve spring 17.
  • both the spring retainer 19 and the valve stem 12 are energized by the valve spring 17.
  • the ECU 100 controls electric current flowing from the power supply 200 to the coils 62 and 162.
  • the ECU 100 obtains temperature and voltage data from a temperature sensor 102 and a voltage sensor 101.
  • the voltage sensor 101 monitors voltage from the power supply 200.
  • the temperature sensor 102 detects temperature (water temperature, air temperature, or the temperature of the electromagnetically driven valve 1).
  • the ECU 100 is connected to a memory unit 104, in which various map data are stored, including the current cycles and the current values that flows into the coils 62 and 162.
  • FIG 2 is a schematic circuit diagram of the electromagnetically driven valve shown in FIG 1 .
  • the two coils 62 and 162 are connected in series to the power supply 200.
  • This embodiment describes an example where the two electromagnets 60 and 160 are arranged on the upper and lower sides respectively, but this example is non-limiting, and more electromagnets may be provided.
  • FIG 3 is a graph that indicates the relationship between the valve lift and electric current during the initial period of operation.
  • FIG 4 is a cross-sectional view of the electromagnetically driven valve indicating the neutral position.
  • FIG. 5 is a cross-sectional view of the electromagnetically driven valve showing a closed-valve state. With reference to FIG 1 to FIG 5 , motion mechanism of the electromagnetically driven valve is described. In the neutral state, the arm portion 31 on the disc 30 is positioned on the center of the upper electromagnet 60 and the lower electromagnet 160, as shown in FIG 4 . This condition continues until a time t10, at which point a electric current I flows to the coils 62 and 162 until a time t11.
  • the distance between the arm portion 31 and the upper electromagnet 60 is made slightly shorter than that between the arm portion 31 and the lower electromagnet 160, a large force acts between the arm portion 31 and the upper electromagnet 60, so that at time t11, the valve element 14 moves from the neutral position toward the closed-valve position.
  • the arm portion 31 can be held by the upper electromagnet 60 as long as a small holding electric current is supplied to the coil 62.
  • FIG. 6 shows a map of current values in relation to different temperatures and voltages.
  • FIG 7 shows a map of cycle lengths in relation to different temperatures and voltages.
  • FIG 8 shows a map of the number of cycles in relation to different temperatures and voltages.
  • the electric current for the initial period of operation will be calculated from the four current values I23, I33, I24, and I34 on the electric current map.
  • the ECU 100 calculates the length of each cycle based on the FIG 7 cycle length map. Under the above-mentioned temperature and voltage conditions, the ECU 100 calculates the cycle length based on the cycle lengths L23, L33, L24, and L34 on the cycle length map.
  • the ECU 100 also calculates the number of cycles based on the FIG 8 map of the number of cycles. Under the above-mentioned temperature and voltage conditions, the ECU 100 calculates the number of cycles based on the numbers of cycles N23, N33, N24, and N34 on the map.
  • the map data shown in the FIG 6 through FIG 8 are stored in the memory unit 104, and the ECU 100 can always access the memory unit 104.
  • the electric current, cycle length, and number of cycles for the initial period of operation are mapped according to the temperature and voltage, and are then controlled to conform to the map based on monitoring values that are input from the temperature and voltage sensors.
  • the normal set value for over-current is momentarily increased.
  • the difference between the measured temperature and the heat-resistance limit temperature of the coils 62 and 162 is greater than under normal operating conditions.
  • the amount by which the electric current is increased is therefore set so that the amount of temperature increase in the coils, due to their heating by the increased electric current, will be equal to the increased temperature difference between the measured temperature and the heat-resistance limit temperature of the coils 62 and 162.
  • the number of cycles for the initial period of operation when the temperature is very low is set so that the temperature of an actuator rises enough to lower the high sliding resistance almost to the sliding resistance level under normal operating conditions. That is, the flow of electric current is controlled so that the upper and lower electromagnets 60 and 160 are heated.
  • the controllability of the electromagnetically driven valve 1 can be improved by accelerating its heating when the temperature is low and the sliding resistance is high.
  • FIG. 9 is a cross-sectional view of an electromagnetically driven valve in accordance with the invention.
  • a permanent magnet 300 is provided on the outer side of driving end 32 of an arm portion 31.
  • the permanent magnet 300 is positioned so that it is apart from a core 161.
  • the arm portion 31 is held in a position where it is not in direct contact with the core 161.
  • An electromagnetically driven valve 1 in accordance with the invention is an electromagnetically driven valve that is operated by the combined action of electromagnetic force and elastic force.
  • the electromagnetically driven valve 1 includes a valve element 14 that has a valve stem 12 and moves in reciprocal motion in the direction in which the valve stem 12 extends; a disc 30 that is interlocked with the valve element 14 at driving end 32 and that oscillates around an axis 35, located at pivoting end 33; a core 161 of an lower electromagnet 160 that oscillates the disc 30; a permanent magnet 300 arranged on the outer side of the disc 30 and positioned in such a way that a magnetic flux that passes through the disc 30 and the core 161 in a direction indicated by arrow 301 becomes greater.
  • the amount of lift of the valve element 14 is made variable, and the permanent magnet 300 is arranged on the outer side of the disc 30 in order to reduce electric current (power consumption) when holding the disc 30 out of contact with the core 161.
  • the permanent magnet 300 is positioned apart from the core 161 and close to driving end 32, yet not in direct contact with an arm portion 31.
  • the arrangement of the permanent magnet 300 in this way increases the flow of the magnetic flux generated by the permanent magnet as indicated by the arrow 301. As a result, power consumption can be reduced and the valve can be made less subject to the effects of voltage when the arm portion 31 is held at the intermediate lift position, so that a highly controllable electromagnetically driven valve 1 is provided.
  • the electromagnetically driven valve is not limited to the single-disc driven type, and it may be structured so that an electromagnet is arranged between two parallel disks.
  • the invention can be used, for example, in the field of electromagnetically driven valves for internal combustion engines that are mounted in vehicles.

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

Claims (2)

  1. Elektromagnetisch angetriebenes Ventil, das durch die kombinierte Wirkung einer elektromagnetischen Kraft und einer elastischen Kraft betätigt wird, dadurch gekennzeichnet, dass das Ventil aufweist.
    ein Ventilelement (14), das einen Ventilschaft (12) aufweist und sich in einer Auf- und Abbewegung in einer Richtung bewegt, in der sich der Ventilschaft erstreckt;
    ein schwingendes Element (30), das mit dem Ventilelement an einem Antriebsende (32) verbunden ist, das sich zu einem drehbar gelagerten Ende (33) erstreckt, von dem sich eine Mittelachse erstreckt, und wobei das schwingende Element um die Mittelachse geschwungen wird,
    Kerne (61, 161) eines Elektromagneten, der das schwingende Element in Schwingung versetzt, und
    einen Dauermagneten (300), der auf der Außenseite des schwingenden Elements angeordnet ist, der so positioniert ist, dass er von den Kernen entfernt angeordnet ist, und der in einer derartigen Position angeordnet ist, dass ein Magnetfluss, der durch das schwingende Element und die Kerne gelangt, zunimmt.
  2. Elektromagnetisch angetriebenes Ventil nach Anspruch 1, wobei
    die Spule eine obere Spule (62) und eine untere Spule (162) beinhaltet, und das schwingende Element (30) zwischen der oberen Spule und der unteren Spule angeordnet ist.
EP07013997A 2005-08-08 2006-07-26 Elektromagnetisch angetriebenes Ventil und dessen Ansteuerungsverfahren Expired - Fee Related EP1840341B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005229605A JP2007046499A (ja) 2005-08-08 2005-08-08 電磁駆動弁
EP06015546A EP1752624A1 (de) 2005-08-08 2006-07-26 Elektromagnetisch angetriebenes Ventil und dessen Ansteuerungsverfahren

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP06015546A Division EP1752624A1 (de) 2005-08-08 2006-07-26 Elektromagnetisch angetriebenes Ventil und dessen Ansteuerungsverfahren

Publications (3)

Publication Number Publication Date
EP1840341A2 EP1840341A2 (de) 2007-10-03
EP1840341A3 EP1840341A3 (de) 2007-12-19
EP1840341B1 true EP1840341B1 (de) 2008-12-17

Family

ID=37402596

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06015546A Withdrawn EP1752624A1 (de) 2005-08-08 2006-07-26 Elektromagnetisch angetriebenes Ventil und dessen Ansteuerungsverfahren
EP07013997A Expired - Fee Related EP1840341B1 (de) 2005-08-08 2006-07-26 Elektromagnetisch angetriebenes Ventil und dessen Ansteuerungsverfahren

Family Applications Before (1)

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EP06015546A Withdrawn EP1752624A1 (de) 2005-08-08 2006-07-26 Elektromagnetisch angetriebenes Ventil und dessen Ansteuerungsverfahren

Country Status (5)

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US (1) US20070028873A1 (de)
EP (2) EP1752624A1 (de)
JP (1) JP2007046499A (de)
CN (1) CN1912357A (de)
DE (1) DE602006004303D1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2969694B1 (fr) * 2010-12-22 2015-08-07 Valeo Sys Controle Moteur Sas Procede de commande d'un actionneur de soupape et dispositif de commande correspondant.
US9322480B2 (en) * 2012-11-12 2016-04-26 Ford Global Technologies, Llc Turbocharger arrangement and set of feedbacks for electric actuator control
JP6337705B2 (ja) * 2014-09-03 2018-06-06 株式会社デンソー 可変バルブタイミング装置
CN110213875A (zh) * 2015-05-11 2019-09-06 株式会社荏原制作所 电磁铁控制装置、电磁铁、电磁铁控制方法及电磁铁系统
CN104882242B (zh) * 2015-05-28 2017-05-03 常熟理工学院 用于电子多臂阅读机构的电磁铁

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
JP2610187B2 (ja) * 1989-04-28 1997-05-14 株式会社いすゞセラミックス研究所 バルブの駆動装置
US5375738A (en) * 1993-10-27 1994-12-27 Nordson Corporation Apparatus for dispensing heated fluid materials
DE19628860B4 (de) * 1996-07-17 2008-07-31 Bayerische Motoren Werke Aktiengesellschaft Elektromagnetische Betätigungsvorrichtung für ein Brennkraftmaschinen-Hubventil
DE19651846B4 (de) * 1996-12-13 2005-02-17 Fev Motorentechnik Gmbh Verfahren zur elektromagnetischen Betätigung eines Gaswechselventils ohne Polflächenberührung
US6354253B1 (en) * 1998-11-20 2002-03-12 Toyota Jidosha Kabushiki Kaisha Solenoid valve device
JP4126787B2 (ja) * 1998-12-07 2008-07-30 トヨタ自動車株式会社 電磁駆動装置
DE19914593C1 (de) * 1999-03-31 2000-09-07 Daimler Chrysler Ag Verfahren zum Betrieb von Aktoren zur elektromagnetischen Ventilsteuerung
JP3715460B2 (ja) * 1999-03-31 2005-11-09 株式会社日立製作所 機関弁の電磁駆動装置
IT1311131B1 (it) * 1999-11-05 2002-03-04 Magneti Marelli Spa Metodo per il controllo di attuatori elettromagnetici perl'azionamento di valvole di aspirazione e scarico in motori a
JP2001336431A (ja) * 2000-05-29 2001-12-07 Toyota Motor Corp 電磁駆動弁を有する内燃機関
ITBO20000366A1 (it) * 2000-06-23 2001-12-23 Magneti Marelli Spa Attuatore elettromagnetico per l'azionamento delle valvole di un motore a scoppio .
DE10035759A1 (de) * 2000-07-22 2002-01-31 Daimler Chrysler Ag Elektromagnetischer Aktuator zur Betätigung eines Gaswechselventils einer Brennkraftmaschine
DE10053596A1 (de) * 2000-10-28 2002-05-02 Daimler Chrysler Ag Elektromagnetischer Aktuator zur Betätigung eines Stellgliedes
ITBO20000678A1 (it) * 2000-11-21 2002-05-21 Magneti Marelli Spa Metodo di controllo di un azionatore elettromagnetico per il comando di una valvola di un motore
DE10120401A1 (de) * 2001-04-25 2002-10-31 Daimler Chrysler Ag Vorrichtung zur Betätigung eines Gaswechselventils

Also Published As

Publication number Publication date
EP1752624A1 (de) 2007-02-14
JP2007046499A (ja) 2007-02-22
DE602006004303D1 (de) 2009-01-29
US20070028873A1 (en) 2007-02-08
EP1840341A2 (de) 2007-10-03
CN1912357A (zh) 2007-02-14
EP1840341A3 (de) 2007-12-19

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