EP1288450A1 - Dispositif de commande de soupape pour moteur à combustion interne - Google Patents
Dispositif de commande de soupape pour moteur à combustion interne Download PDFInfo
- Publication number
- EP1288450A1 EP1288450A1 EP02292012A EP02292012A EP1288450A1 EP 1288450 A1 EP1288450 A1 EP 1288450A1 EP 02292012 A EP02292012 A EP 02292012A EP 02292012 A EP02292012 A EP 02292012A EP 1288450 A1 EP1288450 A1 EP 1288450A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- electromagnet
- rod
- control
- opening
- 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
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000000452 restraining effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000003079 width control Methods 0.000 description 1
Images
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 a device for electromagnetic type, to control the opening and closing an internal combustion engine valve.
- an internal combustion engine has a combustion chamber in which a mixture is admitted fuel at selected times in the operating cycle.
- This cycle includes, in particular, a period of admission to the course of valve (s) is (are) open and a compression period during which this (or these) valve (s) is (are) closed.
- the opening command and closing of the valves is achieved by a synchronization mechanical type with the other engine components such as the crankshaft.
- valves whose opening and closing command is made from electrical way, for example using one (or two) electromagnet (s) acting on a moving part causing the opening and closing movement of the valve combination with one or two springs.
- the command to open and close valves can be done electronically and, from this In fact, the opening and closing moments can be chosen at will, which offers additional possibilities operating control of internal combustion engines.
- FIG. 1 represents a known control device valve.
- valve 10 is represented in closed position, that is to say applied against its seat 12. In this position, the interior 14 of the room of combustion is insulated from the outer part 16.
- valve head 10 From the valve head 10 is secured a tail 18 forming a rod exiting the combustion chamber.
- the valve 10 is kept in the closed state, that is to say applied against its seat 12, thanks to a spring 20 whose one end is integral with an outer wall of the combustion chamber and whose other end 22 bears against a stop 24 secured to the rod 18 in the vicinity of its free end 26.
- two electromagnets 28 are furthermore provided, and 30 which control the displacement of a moving magnetic plate 32.
- the latter is secured to a rod 34 of the same axis as the rod 18, and this rod passes through the magnetic circuits of two electromagnets 28 and 30.
- the electromagnet 28, furthest from the chamber of combustion, is intended to attract the plate 32 so that, as shown, it is applied against a face 36 of the magnetic circuit of this electromagnet 28.
- the end 38 of the rod 34 which is turned towards the chamber is slightly away from the end 26 of the rod 18; so the valve 10 is held in the closed position by the action of the spring 20.
- the separation between the rods 34 and 18 by a game 40 called a distribution set, makes it possible to close complete valve, despite thermal expansion which may be more important for the stem 18, close to the combustion chamber, only for the rest of the device command, however subject to heating by currents of Foucault.
- This game 40 also makes it possible to free oneself, in a some extent, manufacturing tolerances on the lengths stems 18 and 34.
- the second end of the rod 34 is integral with a stop 42 against which supports a spring 44 whose other end 46 has a fixed position.
- the second electromagnet 30 makes it possible to control the valve 10 in the open position.
- the coil of this electromagnet 30 is activated after deactivation of the coil of the electromagnet 28.
- the electromagnet 28 is deactivated, which makes it possible to separate the plate 32 of the face 36 of the magnetic circuit of the electromagnet 28. This separation is facilitated by the action of the 44. In these conditions, the end 38 of the rod 34 comes into contact with the end 26 of the stem 18, or tail, of valve. Then, the electromagnet 30 is activated to attract the movable platen 32 to one side of its magnetic circuit, this attraction to overcome the action of the spring 20.
- the invention overcomes this disadvantage.
- the device of command includes a means to limit the impact velocity of the actuating rod against the rod integral with the valve, this means exerting a holding force on the rod actuating.
- This restraining force is, for example, exerted thanks to a power supply from the electromagnet commanding the closing, after the start of the opening command of the valve.
- the holding force, thus exerted on the rod of actuation makes it possible to reduce the speed of impact, by example of 0.9 m / sec. at 0.25 m / sec.
- the intensity of the current electric in the coil of the control electromagnet of closing is reduced to zero during a first period. Then a current pulse of intensity is then applied significantly lower than the expected intensity for the control of closing the valve, this pulse thus exerting the force restraint that limits the speed of impact, and therefore noise.
- the temporal position of the current pulse of retained, its intensity and duration are, for example, determined empirically.
- the cancellation of the current in the coil allows make sure that the moving plate moves away from the face corresponding of the electromagnet.
- the invention relates, in general, to a device valve control system for an internal combustion engine, this device comprising an electromagnetic means, such as a electromagnet, controlling the movement of an element actuator, such as a rod, for controlling the displacement of a rod integral with the valve, the positions of the actuating element and the rod integral with the valve such that, when the valve is in the closed position, a clearance separates one end of the actuating element from a end of the rod secured to the valve, and these ends come into contact when ordering the opening of the valve.
- This device is characterized in that it comprises a means to limit, during the opening phase of the valve, the impact speed of the end of the control element against the end of the rod secured to the valve.
- the speed limiting means of impact includes a means to exercise on the element actuating a restraining force after the start of the valve opening control.
- the means for exerting a retaining force comprises for example, a means for supplying current to an electromagnet intended for the closing command.
- the intensity of the pulse of the current is substantially less than the intensity of the current supplying the electromagnet when the valve is to be kept in closed position.
- the device preferably comprises a spring acting on the rod secured to the valve to maintain the latter in closed position.
- the actuating element comprises, according to a embodiment, a rod integral with a movable plate on which acts an electromagnet control closing the valve.
- a spring can be provided to push the actuating element towards the opening control position of the valve.
- the invention also relates to a combustion engine internal having a valve control device of the type defined above.
- Figure 2 is a diagram showing a circuit current control applied to the coil of the electromagnet 28 ( Figure 1).
- This circuit 50 has an input 52 on which is applied a value i ref reference or reference intensity.
- This circuit also comprises a feedback input 54 receiving a signal representative of the intensity of the current in the coil of the electromagnet 28; the latter is represented by a block 56 in FIG. 2.
- the error signal produced from the reference signal of the feedback signal i is applied to a correction block 58 which supplies a control signal of the block 56.
- This signal of control is converted to a power signal by a pulse width control 60 which outputs a signal u to the actuator 56.
- a set of current on the input 52 which corresponds to the setpoint represented by the curve 64 of Figure 3.
- This figure is a diagram on which the time in milliseconds has been plotted on the abscissa and on the ordinate the intensity of the current in the coil of the electromagnet 28.
- a current of intensity I 1 of the order of 10 amperes is applied in the example. Then, to open the valve 10, that is to say to move the valve 10 away from its seat 12, the intensity of the current flowing through the coil is canceled, which corresponds to the falling edge 66 of the reference curve 64. , approximately 0.5 ms after the cancellation of the set point, a pulse of retention of intensity I 2 is provided , substantially lower than the intensity I 1 , of the order of 3 A in the example, for a duration of the order of 0.3 ms. After this pulse 68, the intensity of the current in the coil of the electromagnet 28 is reduced to zero.
- the curve 70 in lines ends represents the actual evolution of the current in the coil of the electromagnet 28.
- the difference between the instruction 64 and the actual intensity 70 is, in a classical way, due to the delay of enslavement and inductances, as well as induction of high intensity appearing for low values gap.
- the invention can be used to to slow down the beginning of the movement of the actuating element good for an opening phase than closing. So, at beginning of the valve closing command, one can feed by running the electromagnet for controlling the opening.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
Claims (8)
- Dispositif de commande de soupape pour moteur à combustion interne, ce dispositif comprenant un moyen électromagnétique, tel qu'un électroaimant (28), commandant le déplacement d'un élément d'actionnement, tel qu'une tige (34), destiné à commander le déplacement d'une tige (18) solidaire de la soupape, les positions de l'élément d'actionnement et de la tige solidaire de la soupape étant telles que, lorsque la soupape est en position fermée, un jeu (40) sépare une extrémité (38) de l'élément d'actionnement (34) d'une extrémité (26) de la tige (18) solidaire de la soupape (10), et ces extrémités entrent en contact lors de la commande d'ouverture de la soupape, caractérisé en ce qu'il comprend, pour exercer sur l'élément d'actionnement (34) une force de retenue après le début de la commande d'ouverture de soupape (10), un moyen pour alimenter en courant un électroaimant (28) destiné à la commande de fermeture.
- Dispositif selon la revendication 1, caractérisé en ce qu'il comprend, pour alimenter l'électroaimant (28) de commande de fermeture, lors de la phase d'ouverture de la soupape, un moyen qui, après l'annulation du courant dans la bobine de l'électroaimant (28), produit une impulsion de retenue (68).
- Dispositif selon la revendication 2, caractérisé en ce que l'intensité de l'impulsion du courant de retenue est sensiblement inférieure à l'intensité du courant alimentant l'électroaimant lorsque la soupape (10) doit être maintenue en position fermée.
- Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il comporte un ressort (20) agissant sur la tige solidaire de la soupape pour maintenir cette dernière en position fermée.
- Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'élément d'actionnement (34) comporte une tige solidaire d'un plateau mobile (32) sur lequel agit un électroaimant (28) de commande de fermeture de la soupape.
- Dispositif selon la revendication 5, caractérisé en ce qu'il comporte un électroaimant (30) agissant sur le plateau mobile (32) pour commander l'ouverture de la soupape (10).
- Dispositif selon la revendication 6, caractérisé en ce qu'il comporte un ressort (44) pour pousser l'élément d'actionnement (34) vers la position de commande d'ouverture de la soupape (10).
- Moteur à combustion interne comportant un dispositif de commande de soupape selon l'une des revendications précédentes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0111239 | 2001-08-30 | ||
| FR0111239A FR2829177B1 (fr) | 2001-08-30 | 2001-08-30 | Dispositif de commande de soupape pour moteur a combustion interne |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1288450A1 true EP1288450A1 (fr) | 2003-03-05 |
| EP1288450B1 EP1288450B1 (fr) | 2006-02-08 |
Family
ID=8866821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02292012A Expired - Lifetime EP1288450B1 (fr) | 2001-08-30 | 2002-08-09 | Dispositif de commande de soupape pour moteur à combustion interne |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1288450B1 (fr) |
| AT (1) | ATE317493T1 (fr) |
| DE (1) | DE60209098T2 (fr) |
| FR (1) | FR2829177B1 (fr) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3882883A (en) * | 1973-11-19 | 1975-05-13 | Fairmont Railway Motors Inc | Closed-open center hydraulic valve assembly |
| JPH11236980A (ja) * | 1998-02-23 | 1999-08-31 | Nissan Motor Co Ltd | 弁駆動装置 |
| EP0959479A2 (fr) * | 1998-04-28 | 1999-11-24 | Siemens Automotive Corporation | Procédé de régulation pour la vitesse de l'armature d'un actionneur électromagnétique |
| DE19832196A1 (de) * | 1998-07-17 | 2000-01-20 | Bayerische Motoren Werke Ag | Verfahren zur Reduzierung der Auftreffgeschwindigkeit eines Ankers eines elektromagnetischen Aktuators |
| JP2000314305A (ja) * | 1999-04-30 | 2000-11-14 | Toyota Motor Corp | 電磁駆動弁 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19529155B4 (de) * | 1995-08-08 | 2007-05-24 | Fev Motorentechnik Gmbh | Verfahren zur Messung des Ventilspiels an einem durch einen elektromagnetischen Aktuator betätigten Gaswechselventil |
| FR2812684B1 (fr) * | 2000-08-01 | 2002-10-25 | Sagem | Procede et dispositif de commande d'ouverture de soupape a actionneur electromagnetique |
| DE10112999A1 (de) * | 2001-03-17 | 2002-09-19 | Bayerische Motoren Werke Ag | Verfahren beim Abstellen einer Brennkraftmaschine mit elektromagnetisch betätigten Gaswechselventilen |
-
2001
- 2001-08-30 FR FR0111239A patent/FR2829177B1/fr not_active Expired - Fee Related
-
2002
- 2002-08-09 EP EP02292012A patent/EP1288450B1/fr not_active Expired - Lifetime
- 2002-08-09 AT AT02292012T patent/ATE317493T1/de not_active IP Right Cessation
- 2002-08-09 DE DE60209098T patent/DE60209098T2/de not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3882883A (en) * | 1973-11-19 | 1975-05-13 | Fairmont Railway Motors Inc | Closed-open center hydraulic valve assembly |
| JPH11236980A (ja) * | 1998-02-23 | 1999-08-31 | Nissan Motor Co Ltd | 弁駆動装置 |
| EP0959479A2 (fr) * | 1998-04-28 | 1999-11-24 | Siemens Automotive Corporation | Procédé de régulation pour la vitesse de l'armature d'un actionneur électromagnétique |
| DE19832196A1 (de) * | 1998-07-17 | 2000-01-20 | Bayerische Motoren Werke Ag | Verfahren zur Reduzierung der Auftreffgeschwindigkeit eines Ankers eines elektromagnetischen Aktuators |
| JP2000314305A (ja) * | 1999-04-30 | 2000-11-14 | Toyota Motor Corp | 電磁駆動弁 |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 1999, no. 13 30 November 1999 (1999-11-30) * |
| PATENT ABSTRACTS OF JAPAN vol. 2000, no. 14 5 March 2001 (2001-03-05) * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2829177B1 (fr) | 2005-12-02 |
| DE60209098D1 (de) | 2006-04-20 |
| EP1288450B1 (fr) | 2006-02-08 |
| ATE317493T1 (de) | 2006-02-15 |
| DE60209098T2 (de) | 2007-07-12 |
| FR2829177A1 (fr) | 2003-03-07 |
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