EP1174596A1 - Elektromagnetischer Hubventilaktuator in einer Brennkraftmaschine - Google Patents

Elektromagnetischer Hubventilaktuator in einer Brennkraftmaschine Download PDF

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Publication number
EP1174596A1
EP1174596A1 EP01401949A EP01401949A EP1174596A1 EP 1174596 A1 EP1174596 A1 EP 1174596A1 EP 01401949 A EP01401949 A EP 01401949A EP 01401949 A EP01401949 A EP 01401949A EP 1174596 A1 EP1174596 A1 EP 1174596A1
Authority
EP
European Patent Office
Prior art keywords
electromagnet
valve
permanent magnet
actuator
magnetization
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
EP01401949A
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English (en)
French (fr)
Other versions
EP1174596B1 (de
Inventor
Stéphane Guerin
Jean-Paul Yonnet
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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 Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1174596A1 publication Critical patent/EP1174596A1/de
Application granted granted Critical
Publication of EP1174596B1 publication Critical patent/EP1174596B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to valve actuators of internal combustion engines.
  • a valve actuator of the aforementioned type generally comprises two electromagnets between which is provided an air gap.
  • a magnetic pallet linked to the valve actuated, movable by electromagnets against storage springs energy.
  • the arrangement thus formed forms a harmonic oscillator in which stores the energy required for rapid switching by the springs and the change of position is controlled using the electromagnets.
  • the valve position is checked by means of the two coils of electromagnets by application of current which generates a field magnetic producing a force F.
  • this force is proportional to the square of the current injected in the coils and inversely proportional to the square of the air gap.
  • This force is also very sensitive to the current injected into the coils.
  • the electromagnet can only attract the pallet or plate because the reversal of the direction of the current in the supply coils does not change the direction of the force exerted on the pallet, because this force is a function of the square I 2 current in the coils.
  • the force curve of a conventional actuator is therefore well suited to holding the valve in the closed or open position, but it is not suitable when carrying out work over the entire stroke of the valve.
  • the actuator On admission, the actuator must be able to provide the necessary energy at switching. This is to compensate for friction losses which rise at about 0.2 J for an 8 mm stroke or lift of the valve, and by therefore from the range of electromagnets.
  • the energy provided by an electromagnet throughout the race above, is equal to the integral of the force.
  • the useful power would be 20 W, which is low compared to its mass, of the order of 1 kg and its large volume.
  • the energy to be supplied is around 1.4 J to fight against pressure in the cylinder chamber when opening the valve.
  • the current actuator has a low power density which limits its use to the control of the intake valves of engines of unit displacement greater than or equal to 500 cm 3 .
  • the efficiency of an actuator is the ratio between mechanical energy returned (useful) and the electrical energy consumed. It is around 30%, losses being due mainly to induced currents and losses by effect Joule.
  • An engine revolution has a duration of 60 ms at 1000 rpm, while a valve transition takes approximately 3.5 ms. We can see that at low speed, the system statistically very often in a stable position, either open or closed.
  • the actuator lends itself well to this operation, since the force produced by the electromagnet is naturally raised to zero air gap.
  • the consumption of electric current weighs heavily in the calculation of the consumption of the vehicle which is done at an average speed of 1600 RPM approximately, representative of the actual use of vehicles which contains a lot driving at low engine speeds.
  • 100 W electrical requires approximately 200 W for the internal combustion engine, approximately 1.5% of fuel consumption per cycle.
  • the engine thus forms a complementary parking brake that some users use as an additional brake to the handbrake, in particular in the ribs.
  • valves When using electromagnetic actuators, the valves are in an equilibrium position in the middle, so that all the engine chambers are at atmospheric pressure and there is no more additional braking possible.
  • the actuator itself is relatively inexpensive due to its simplicity, but the associated control electronics as well as the valve position, are complex and therefore expensive.
  • the invention aims to remedy the drawbacks of electromagnetic actuators classics by creating an actuator, which while being priced at comes relatively low, has improved performance in areas mentioned above.
  • an electromagnetic valve actuator internal combustion engine comprising an electromagnet comprising a coil supply, a magnetic pallet linked to a drive member of the valve against the action of at least one energy storage spring of switching of said valve, characterized in that in the magnetic body of the electromagnet is interposed a permanent magnet whose magnetization combines to the field generated in said body by said supply coil.
  • the actuator shown in FIG. 1 comprises an electromagnet 1 of which the body of magnetic material, for example of laminated sheet metal, carries a coil supply 2.
  • the body comprises two pole pieces 3,4 joined together by a permanent magnet 5 surrounded by the power coil 2.
  • the magnetization of the permanent magnet 5 is in the present parallel example to the field generated by the supply coil 2 in the magnetic body of the electromagnet.
  • Each pole piece 3,4 of the magnetic body has a portion 6.7 perpendicular to the permanent magnet 5.
  • Each of the portions 6.7 has a first branch of short length 8.9, straight and a second branch longer, L-shaped, 10.11 whose free end is aligned with the free end correspondent of the respective branch 8.9.
  • the stem 16 and the stem of the valve 17 are surrounded by springs helical 18,19 arranged on either side of the magnetic plate 15, and taking support respectively between the corresponding face of said plate and the magnetic body of the electromagnet 1 with regard to the spring 18 and the wall of cylinder head C with regard to spring 19.
  • the actuator comprises an inclined permanent magnet 20, disposed between two pole pieces 21, 22 having inclined ends in contact with the side faces of the magnet 20, the magnet 20 and the ends of the pole pieces 21,22 being surrounded by a supply coil 23.
  • the direction of the magnetization is inclined relative to the field generated by the supply coil 23.
  • the supply of the coil 2 causes the creation in the body of the electromagnet of an electromagnetic field parallel to the direction of magnetization of the permanent magnet and which combines with said magnetization.
  • the pallet is moved up or down, causing it to close or open of the valve 17 and the compression of the corresponding spring 18 or 19.
  • the pallet 15 is held in position by the permanent magnet 5 alone, ie without current consumption.
  • a single electromagnet provides in combination with the two energy storage springs 18,19, the movement of the valve 17 in the direction of opening and closing.
  • the associated spring 18.19 causes the displacement of the pallet 15 to from its points of contact with branches 8.9 to its points of contact with the branches 10,11 of the magnetic circuit of the electromagnet or vice versa.
  • the power consumption required for switching is also reduced by the reduction of losses by Joule effect.
  • the oblique arrangement of the magnet further reduces the size.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Spark Plugs (AREA)
  • Magnetically Actuated Valves (AREA)
EP01401949A 2000-07-20 2001-07-19 Elektromagnetischer Hubventilaktuator in einer Brennkraftmaschine Expired - Lifetime EP1174596B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0009546 2000-07-20
FR0009546A FR2812025B1 (fr) 2000-07-20 2000-07-20 Actionneur electromagnetique de soupape de moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1174596A1 true EP1174596A1 (de) 2002-01-23
EP1174596B1 EP1174596B1 (de) 2005-12-21

Family

ID=8852749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01401949A Expired - Lifetime EP1174596B1 (de) 2000-07-20 2001-07-19 Elektromagnetischer Hubventilaktuator in einer Brennkraftmaschine

Country Status (5)

Country Link
EP (1) EP1174596B1 (de)
AT (1) ATE313702T1 (de)
DE (1) DE60116000T2 (de)
ES (1) ES2250321T3 (de)
FR (1) FR2812025B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2851292A1 (fr) * 2003-02-18 2004-08-20 Peugeot Citroen Automobiles Sa Actionneur electromecanique de soupape pour moteur a combustion interne et moteur a combustion interne muni d'un tel ationneur
US7097150B2 (en) 2003-02-18 2006-08-29 Peugeot Citroen Automobiles Sa Electromechanical valve control actuator for internal combustion engines and internal combustion engine equipped with such an actuator
US7111595B2 (en) 2003-02-18 2006-09-26 Peugeot Citroen Automobiles Sa Electromechanical valve control actuator for internal combustion engines
US7146943B2 (en) 2003-02-18 2006-12-12 Peugeot Citroen Automobiles Sa Electromechanical valve actuator for internal combustion engines and internal combustion engine equipped with such an actuator
EP1568858A3 (de) * 2004-02-27 2009-01-21 Peugeot Citroen Automobiles SA Elektromagnetische Ventilsteuerungseinrichtung für Brennkraftmaschine
US7487749B2 (en) 2003-02-18 2009-02-10 Peugeot Citroen Automobiles Sa Electromechanical valve actuator for internal combustion engines and internal combustion engine equipped with such an actuator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7124720B2 (en) 2004-03-25 2006-10-24 Ford Global Technologies, Llc Permanent magnet electromagnetic actuator for an electronic valve actuation system of an engine
US7249579B2 (en) 2004-03-25 2007-07-31 Ford Global Technologies, Llc Enhanced permanent magnet electromagnetic actuator for an electronic valve actuation system of an engine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0034955A1 (de) * 1980-02-20 1981-09-02 DUCELLIER & Cie Zündspule für Verbrennungsmotoren
US4829947A (en) * 1987-08-12 1989-05-16 General Motors Corporation Variable lift operation of bistable electromechanical poppet valve actuator
DE19824537A1 (de) * 1998-06-03 1999-12-09 Lsp Innovative Automotive Sys Elektromagnetische Stelleinrichtung
JPH11350929A (ja) * 1998-06-11 1999-12-21 Toyota Motor Corp 電磁駆動バルブ
FR2784222A1 (fr) * 1998-10-06 2000-04-07 Sagem Actionneur electromagnetique de soupape
EP1010866A2 (de) * 1998-12-07 2000-06-21 Toyota Jidosha Kabushiki Kaisha Elektromagnetischer Ventilbetätiger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0034955A1 (de) * 1980-02-20 1981-09-02 DUCELLIER & Cie Zündspule für Verbrennungsmotoren
US4829947A (en) * 1987-08-12 1989-05-16 General Motors Corporation Variable lift operation of bistable electromechanical poppet valve actuator
DE19824537A1 (de) * 1998-06-03 1999-12-09 Lsp Innovative Automotive Sys Elektromagnetische Stelleinrichtung
JPH11350929A (ja) * 1998-06-11 1999-12-21 Toyota Motor Corp 電磁駆動バルブ
FR2784222A1 (fr) * 1998-10-06 2000-04-07 Sagem Actionneur electromagnetique de soupape
EP1010866A2 (de) * 1998-12-07 2000-06-21 Toyota Jidosha Kabushiki Kaisha Elektromagnetischer Ventilbetätiger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 03 30 March 2000 (2000-03-30) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2851292A1 (fr) * 2003-02-18 2004-08-20 Peugeot Citroen Automobiles Sa Actionneur electromecanique de soupape pour moteur a combustion interne et moteur a combustion interne muni d'un tel ationneur
EP1450012A1 (de) * 2003-02-18 2004-08-25 Peugeot Citroen Automobiles SA Elektromechanische Ventilbetätigungsvorrichtung für Brennkraftmaschine und Brennkraftmaschine mit dieser Ventilbetätigungsvorrichtung
US7097150B2 (en) 2003-02-18 2006-08-29 Peugeot Citroen Automobiles Sa Electromechanical valve control actuator for internal combustion engines and internal combustion engine equipped with such an actuator
US7111595B2 (en) 2003-02-18 2006-09-26 Peugeot Citroen Automobiles Sa Electromechanical valve control actuator for internal combustion engines
US7146943B2 (en) 2003-02-18 2006-12-12 Peugeot Citroen Automobiles Sa Electromechanical valve actuator for internal combustion engines and internal combustion engine equipped with such an actuator
US7182051B2 (en) 2003-02-18 2007-02-27 Peugeot Citroen Automobiles Sa Electromechanical valve actuator for internal combustion engines and internal combustion engine equipped with such an actuator
US7487749B2 (en) 2003-02-18 2009-02-10 Peugeot Citroen Automobiles Sa Electromechanical valve actuator for internal combustion engines and internal combustion engine equipped with such an actuator
EP1568858A3 (de) * 2004-02-27 2009-01-21 Peugeot Citroen Automobiles SA Elektromagnetische Ventilsteuerungseinrichtung für Brennkraftmaschine

Also Published As

Publication number Publication date
DE60116000T2 (de) 2006-07-27
FR2812025B1 (fr) 2003-01-24
EP1174596B1 (de) 2005-12-21
FR2812025A1 (fr) 2002-01-25
ATE313702T1 (de) 2006-01-15
ES2250321T3 (es) 2006-04-16
DE60116000D1 (de) 2006-01-26

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