EP1174596B1 - Actionneur électromagnétique de soupape de moteur à combustion interne - Google Patents
Actionneur électromagnétique de soupape de moteur à combustion interne Download PDFInfo
- Publication number
- EP1174596B1 EP1174596B1 EP01401949A EP01401949A EP1174596B1 EP 1174596 B1 EP1174596 B1 EP 1174596B1 EP 01401949 A EP01401949 A EP 01401949A EP 01401949 A EP01401949 A EP 01401949A EP 1174596 B1 EP1174596 B1 EP 1174596B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electromagnet
- valve
- actuator
- permanent magnet
- field generated
- 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 - Lifetime
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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 the valve actuators of internal combustion engines.
- a valve actuator of the aforementioned type generally comprises two electromagnets between which is formed a gap.
- a magnetic paddle connected to the valve to operate, movable by electromagnets against storage springs energy.
- the arrangement thus formed forms a harmonic oscillator in which storage of energy necessary for rapid switching is ensured by the springs and the change of position is controlled using electromagnets.
- This system is simple in appearance but has limitations techniques.
- the position of the valve is controlled by means of the two coils electromagnets by application of current that generates a field magnetic generating a force F.
- this force is proportional to the square of the injected current in the coils and inversely proportional to the square of the 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 stress curve of a conventional actuator is therefore well adapted to keeping the valve in the closed or open position, but it is not suitable to the realization of a work on the whole race of the valve.
- the actuator must be able to provide the necessary energy at switching. This is to compensate for the friction losses that approximately 0.2 J for a stroke or lift of 8 mm from the valve, and consequence of 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 big volume.
- the energy to be supplied is of the order of 1.4 J to fight against the 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 cubic capacity greater than or equal to 500 cm 3 .
- the efficiency of an actuator is the ratio of mechanical energy restored (useful) and the electrical energy consumed. It is around 30%, the mainly due to induced currents and loss of Joule.
- a motor revolution has a duration of 60 ms at 1000 rpm, whereas Valve transition lasts about 3.5 ms.
- Valve transition lasts about 3.5 ms.
- the actuator lends itself well to this operation, since the force produced by the electromagnet is naturally raised to zero gap.
- the consumption of electric current weighs heavily in the calculating the vehicle's consumption at an average speed of 1600 RPM approximately, representative of the actual use of vehicles which contains a lot urban driving at low engine speed.
- 100 W electric require about 200 W for the engine, which is about 1.5% of the fuel consumption per cycle.
- the current actuators have a relatively large height because of the stacking of springs, two electromagnets and a tray actuator or pallet.
- the engine thus forms a complementary parking brake that some users use as additional brake to the parking brake, especially in the coasts.
- valves When using electromagnetic actuators, valves are in equilibrium position in the middle, so that all engine chambers are at atmospheric pressure and there is more than additional braking possible.
- the actuator itself is relatively cheap in because of its simplicity, but the associated control electronics as well as the position sensor of the valve, are complex and therefore expensive.
- the invention aims to remedy the disadvantages of the actuators electromagnetic effects by creating an actuator, which while being a relatively low cost price, shows performance improved in the areas mentioned above.
- an electromagnetic actuator of internal combustion engine valve comprising an electromagnet having a feed reel, a magnetic pallet connected to a drive member of the valve against the action of at least one switching energy storage spring of said valve and a permanent magnet interposed in the magnetic body of the electromagnet whose magnetization combines with the field generated in said body by said power supply coil, characterized in that the magnetic body of the electromagnet comprising two pole pieces each comprising a first and second branches defining between them air gaps, said pallet being movably mounted in the air gaps defined by the first and second branches of two pole pieces, said magnet permanent is disposed between said pole pieces.
- the actuator represented in FIG. 1 comprises an electromagnet 1 whose the body made of magnetic material, for example laminated metal sheets, carries a coil supply 2.
- the body comprises two pole pieces 3,4 joined together by a permanent magnet 5 surrounded by the supply coil 2.
- the magnetization of the permanent magnet 5 is in this 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 a first branch of short length 8.9, rectilinear and a second branch longer, in L, 10,11, the free end of which is aligned with the free end respective branch 8.9.
- the stem 16 and the tail of the valve 17 are surrounded by springs helical 18,19 disposed 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 arranged 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 feed reel 23.
- the direction of the magnetization is inclined relative to the field generated by the feed reel 23.
- FIG. 2 is in all respects similar to that of Figure 1 and will not be described.
- the feeding 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 position of the pallet 15 is maintained by the permanent magnet 5 alone, ie without power consumption.
- a single electromagnet ensures in combination with both energy storage springs 18,19, the displacement of the valve 17 in the direction of opening and closing.
- the associated spring 18, 19 causes the pallet 15 to move 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 Joule losses.
- the oblique arrangement of the magnet makes it possible to further reduce the bulk.
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)
Description
- l'aimant permanent est placé dans le corps de l'électroaimant de manière que son aimantation soit parallèle au champ engendré dans ledit corps par ladite bobine d'alimentation ;
- l'aimant permanent est placé dans le corps de l'électroaimant de manière que son aimantation soit inclinée par rapport au champ engendré dans ledit corps par ladite bobine d'alimentation.
- la Fig.1 est une vue schématique en coupe d'un actionneur électromagnétique de soupape à un électroaimant suivant l'invention ; et
- la Fig.2 est une vue schématique partielle en coupe d'une variante d'actionneur électromagnétique de soupape suivant l'invention.
Claims (3)
- Actionneur électromagnétique de soupape de moteur à combustion interne comprenant un électroaimant comportant une bobine d'alimentation (2;23), une palette magnétique (15) liée à un organe d'entraínement (16) de la soupape (17) à l'encontre de l'action d'au moins un ressort (18,19) de stockage d'énergie de commutation de ladite soupape, et un aimant permanent (5;20) interposé dans le corps magnétique de l'électroaimant dont l'aimantation se combine au champ engendré dans ledit corps par ladite bobine d'alimentation (2;23), caractérisé en ce que le corps magnétique de l'électroaimant comprenant deux pièces polaires (3,4), comprenant chacune une première et une seconde branches (8,9,10,11) définissant entre elles des entrefers (13,14), ladite palette (15) étant montée déplaçable dans les entrefers définis par les première et seconde branches (8,9,10,11) de deux pièces polaires, ledit aimant permanent (5;20) est disposé entre lesdites pièces polaires (3,4).
- Actionneur suivant la revendication 1, caractérisé en ce que l'aimant permanent (5) est placé dans le corps de l'électroaimant de manière que son aimantation soit parallèle au champ engendré dans ledit corps par ladite bobine d'alimentation (2).
- Actionneur suivant la revendication 1, caractérisé en ce que l'aimant permanent (20) est placé dans le corps de l'électroaimant de manière que son aimantation soit inclinée par rapport au champ engendré dans ledit corps par ladite bobine d'alimentation (23).
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 EP1174596A1 (fr) | 2002-01-23 |
EP1174596B1 true EP1174596B1 (fr) | 2005-12-21 |
Family
ID=8852749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01401949A Expired - Lifetime EP1174596B1 (fr) | 2000-07-20 | 2001-07-19 | Actionneur électromagnétique de soupape de moteur à combustion interne |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1174596B1 (fr) |
AT (1) | ATE313702T1 (fr) |
DE (1) | DE60116000T2 (fr) |
ES (1) | ES2250321T3 (fr) |
FR (1) | FR2812025B1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2851289B1 (fr) | 2003-02-18 | 2007-04-06 | Peugeot Citroen Automobiles Sa | Actionneur electromecanique de soupape pour moteur a combustion interne et moteur a combustion interne muni d'un tel actionneur |
FR2851291B1 (fr) | 2003-02-18 | 2006-12-08 | Peugeot Citroen Automobiles Sa | Actionneur electromecanique de commande de soupape pour moteur a combustion interne et moteur a combustion interne muni d'un tel actionneur |
FR2851292B1 (fr) | 2003-02-18 | 2007-02-23 | Peugeot Citroen Automobiles Sa | Actionneur electromecanique de soupape pour moteur a combustion interne et moteur a combustion interne muni d'un tel ationneur |
FR2851290B1 (fr) | 2003-02-18 | 2007-02-09 | Peugeot Citroen Automobiles Sa | Actionneur electromecanique de commande de soupape pour moteur a combustion interne |
FR2851367B1 (fr) | 2003-02-18 | 2008-02-29 | Peugeot Citroen Automobiles Sa | Actionneur electromecanique de soupape pour moteur a combustion interne et moteur a combustion interne muni d'un tel actionneur |
FR2866923B1 (fr) * | 2004-02-27 | 2006-06-30 | Peugeot Citroen Automobiles Sa | Dispositif d'actionnement electromagnetique de soupape pour moteur a combustion interne |
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 |
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 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0034955B1 (fr) * | 1980-02-20 | 1984-10-24 | DUCELLIER & Cie | Bobine d'allumage pour moteurs à combustion interne |
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 |
JP3547115B2 (ja) * | 1998-06-11 | 2004-07-28 | トヨタ自動車株式会社 | 電磁駆動バルブ |
FR2784222B1 (fr) * | 1998-10-06 | 2000-12-22 | Sagem | Actionneur electromagnetique de soupape |
JP4126787B2 (ja) * | 1998-12-07 | 2008-07-30 | トヨタ自動車株式会社 | 電磁駆動装置 |
-
2000
- 2000-07-20 FR FR0009546A patent/FR2812025B1/fr not_active Expired - Fee Related
-
2001
- 2001-07-19 AT AT01401949T patent/ATE313702T1/de not_active IP Right Cessation
- 2001-07-19 DE DE60116000T patent/DE60116000T2/de not_active Expired - Lifetime
- 2001-07-19 ES ES01401949T patent/ES2250321T3/es not_active Expired - Lifetime
- 2001-07-19 EP EP01401949A patent/EP1174596B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE60116000T2 (de) | 2006-07-27 |
FR2812025B1 (fr) | 2003-01-24 |
ES2250321T3 (es) | 2006-04-16 |
FR2812025A1 (fr) | 2002-01-25 |
ATE313702T1 (de) | 2006-01-15 |
EP1174596A1 (fr) | 2002-01-23 |
DE60116000D1 (de) | 2006-01-26 |
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