EP1138884A1 - Procédé de commande de l'ouverture préalable d'une soupape d'échappement pour un moteur à distribution électromécanique - Google Patents
Procédé de commande de l'ouverture préalable d'une soupape d'échappement pour un moteur à distribution électromécanique Download PDFInfo
- Publication number
- EP1138884A1 EP1138884A1 EP01400292A EP01400292A EP1138884A1 EP 1138884 A1 EP1138884 A1 EP 1138884A1 EP 01400292 A EP01400292 A EP 01400292A EP 01400292 A EP01400292 A EP 01400292A EP 1138884 A1 EP1138884 A1 EP 1138884A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- opening
- valve
- pilot
- main
- cylinder
- 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
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000007246 mechanism Effects 0.000 title description 3
- 239000007789 gas Substances 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 2
- 230000003042 antagnostic effect Effects 0.000 claims 1
- 239000000567 combustion gas Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 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
-
- 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
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/06—Timing or lift different for valves of same cylinder
Definitions
- the present invention relates to a control method the opening of an exhaust valve for a electromechanical distribution.
- an electromechanical actuator for cause the opening and closing movements of valves in an internal combustion engine, in order to carry out the admission and / or exhaust of combustion in the cylinders of this engine, constitutes a particularly well adapted technology, allowing achieve significant gains with respect to the engine fuel consumption and performance, further reducing pollution from exhaust gases in the air
- Such electromechanical actuators allow particular to obtain a variable adjustment of the angles, that is to say instants of opening and closing of each valve according to the conditions of use of the engine, in particular to optimize fuel efficiency of it.
- this set comprises, associated with the valve stem, one or more electromagnetic windings defining an air gap whose distance is substantially equal to the stroke of the valve head, the rod being integral with a plate transverse in magnetic material, housed in the air gap, so that depending on the current flowing through the coils, this tray is drawn to one side or the other, so that the valve moves from its position from opening to closing, the swash plate on either side of an equilibrium position intermediate.
- valve is controlled by two electromagnets.
- we know systems allowing to obtain the same result with only one winding, thanks to a particular geometry of the armature of the corresponding electromagnet.
- valve stem is also associated with springs working respectively and simultaneously in compression and in extension or vice versa as appropriate, in particular depending on the direction of movement of this valve stem, at opening or closing, the effect of these springs adding to that of the force of attraction electromagnetic exerted on the transverse plate.
- FIGS. 1a, 1b and 1c schematically illustrate a known device of this kind.
- reference 1 designates a rod illustrated in vertical position which has at its lower end a valve head 2 and at its opposite end a bearing surface 3 for a spring 4, mounted between this span and a fixed stop 5.
- the rod 1 has on the side of the valve head 2 a other bearing surface 6 for a second spring 7, mounted between this bearing surface and a fixed guide 8 having a bore through 9 in which slides, according to a movement of back and forth, the corresponding end of the rod 1.
- This rod is also equipped, between the spans support 3 and 6 of springs 4 and 7, of a plate transverse 10 which, if the rod is vertical, extends horizontally, this plate being mounted in an air gap 11 formed between two electromagnets, respectively 12 and 13, each of these electromagnets comprising a yoke 14 in magnetic material and an electrical winding 15, of so that the passage of a current through the windings of two electromagnets cause an effect on the plate 10 of attraction by one of these electromagnets and repulsion by the other, the valve head 2 thus oscillating between two positions where the plate is in contact with one or the other of the electromagnets.
- FIG 1a illustrates the equilibrium position of the assembly thus envisaged, in which the plate 10 is substantially in the middle of the air gap 11 between the two electromagnets 12 and 13, Figure 1b showing the position where this plate moved to be in contact of the electromagnet 12 and Figure 1c that where conversely, the plate is applied against the electromagnet 13.
- the present invention relates to a control method opening an exhaust valve using a electromechanical actuator of the kind described above, which overcomes these disadvantages.
- control method considered, for the opening of an exhaust valve subject to permanence of the effect of a thrust spring, characterized in that it consists in carrying out a gas decompression in the cylinder through an opening prior or "pilot” of this valve, before performed a complete or “main” opening.
- the opening of the valve exhaust is done first under the action of only springs, then supply the electromagnet (s) to bring and capture the valve in full position opening: although gas has started to escape, the pressure remains relatively high, causing disadvantages mentioned above.
- a pilot opening is first produced during which the valve opens and closes under the action of the springs alone, then a so-called opening "main opening” which takes place practically as the classic openings, this time capturing the valve in full open position.
- the valve does not reach its full opening position and is not captured in this position.
- the gases escaping during the entire duration of the pilot opening, then at the start of the main opening the residual pressure is a lot lower than in the prior art when feeding the electromagnet and the power consumption is more low.
- the method according to the invention therefore does not require for its implementation work that a very low overall energy expenditure, the mechanical work absorbed by the gases in the cylinder being minimal and partly offset by the fact that when of the pilot opening, we do not power the electromagnet to capture the valve in the open position.
- pilot opening of the exhaust valve is obtained exclusively by the spring of the actuator.
- the pilot opening then the main opening are made on the same valve exhaust or these openings are made on two different valves from the same cylinder. Also, the pilot opening and the main opening can be performed alternately, from one cycle to the next, on a same exhaust valve to distribute the dissipation thermal.
- valve is used to make the opening pilot and the main opening it's not essential, according to another characteristic of the process of the invention, to capture this valve in the position of closure between the two openings, but only to feed the winding for a fraction of time just necessary to maintain an oscillation of the valve, sufficient to make the main opening: just give it speed, during its return movement, without necessarily reaching the closed position, but a position where, if we cut the current, the springs drive it again in the direction of the opening.
- the main opening can be carried out before or after the end of the pilot opening.
- the average energy dissipated in the windings of the corresponding actuators, necessary for the valve control carrying out the main opening is half that corresponding to the solution using a single valve, permanently dedicated to this opening main.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Description
Claims (8)
- Procédé de commande de l'ouverture d'une soupape d'échappement du gaz de combustion, prévue sur un cylindre d'un moteur à combustion interne, au moyen d'un actionneur électromécanique comportant une tige de commande (1) portant un plateau transversal (10) se déplaçant dans un entrefer (11) délimité par un ou plusieurs électroaimants (12, 13) attirant alternativement le plateau en combinaison avec un effort créé par des ressorts antagonistes (4, 7) agissant sur la tige, le plateau se déplaçant de façon oscillante à partir d'une position d'équilibre intermédiaire entre deux positions finales dans lesquelles il entre en contact avec un électroaimant, caractérisé en ce qu'il consiste à réaliser une décompression du gaz dans le cylindre grâce à une ouverture préalable ou "pilote" de cette soupape, avant que ne soit réalisée une ouverture complète ou "principale".
- Procédé selon la revendication 1, caractérisé en ce que, lors de l'ouverture pilote, la soupape n'atteint pas sa position finale de pleine ouverture.
- Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que l'ouverture pilote de la soupape d'échappement est obtenue exclusivement par le ressort de l'actionneur.
- Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'ouverture pilote puis l'ouverture principale sont réalisées sur la même soupape d'échappement.
- Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'ouverture pilote puis l'ouverture principale sont réalisées sur deux soupapes différentes du même cylindre.
- Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'ouverture pilote puis l'ouverture principale sont réalisées alternativement d'un cycle sur l'autre sur une même soupape d'échappement.
- Procédé selon la revendication 4, caractérisé en ce qu'on alimente l'enroulement de l'électroaimant pendant une fraction de temps juste nécessaire pour entretenir une oscillation de la soupape, suffisante pour réaliser l'ouverture principale.
- Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'ouverture principale est réalisée avant ou après la fin de l'ouverture pilote.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0001492 | 2000-02-07 | ||
| FR0001492A FR2804716B1 (fr) | 2000-02-07 | 2000-02-07 | Procede de commande de l'ouverture d'une soupape d'echappement pour un moteur a distribution electromecanique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1138884A1 true EP1138884A1 (fr) | 2001-10-04 |
| EP1138884B1 EP1138884B1 (fr) | 2019-01-30 |
Family
ID=8846720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01400292.7A Expired - Lifetime EP1138884B1 (fr) | 2000-02-07 | 2001-02-06 | Procédé de commande de l'ouverture préalable d'une soupape d'échappement pour un moteur à distribution électromécanique |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1138884B1 (fr) |
| FR (1) | FR2804716B1 (fr) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3403242A1 (de) * | 1984-01-31 | 1985-08-01 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Nockentrieb mit einem rollenstoessel |
| EP0471614A1 (fr) * | 1990-08-17 | 1992-02-19 | Regie Nationale Des Usines Renault S.A. | Dispositif d'actionnement pour soupape notamment dans un moteur à combustion interne |
| US5129369A (en) * | 1989-12-20 | 1992-07-14 | Isuzu Ceramics Research Institute Co., Ltd. | Electromagnetic valve control system |
| US5765513A (en) * | 1996-11-12 | 1998-06-16 | Ford Global Technologies, Inc. | Electromechanically actuated valve |
| DE19733140A1 (de) | 1997-07-31 | 1999-02-04 | Fev Motorentech Gmbh & Co Kg | Verfahren zur Beeinflussung der Gemischbildung in Zylindern von Kolbenbrennkraftmaschinen durch Veränderung des Ventilhubs |
| DE19810609A1 (de) * | 1998-03-12 | 1999-09-16 | Lsp Innovative Automotive Sys | Elektromagnetische Stelleinrichtung |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09317419A (ja) * | 1996-05-28 | 1997-12-09 | Toyota Motor Corp | 吸排気用電磁駆動弁の異常検出方法 |
-
2000
- 2000-02-07 FR FR0001492A patent/FR2804716B1/fr not_active Expired - Fee Related
-
2001
- 2001-02-06 EP EP01400292.7A patent/EP1138884B1/fr not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3403242A1 (de) * | 1984-01-31 | 1985-08-01 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Nockentrieb mit einem rollenstoessel |
| US5129369A (en) * | 1989-12-20 | 1992-07-14 | Isuzu Ceramics Research Institute Co., Ltd. | Electromagnetic valve control system |
| EP0471614A1 (fr) * | 1990-08-17 | 1992-02-19 | Regie Nationale Des Usines Renault S.A. | Dispositif d'actionnement pour soupape notamment dans un moteur à combustion interne |
| US5765513A (en) * | 1996-11-12 | 1998-06-16 | Ford Global Technologies, Inc. | Electromechanically actuated valve |
| DE19733140A1 (de) | 1997-07-31 | 1999-02-04 | Fev Motorentech Gmbh & Co Kg | Verfahren zur Beeinflussung der Gemischbildung in Zylindern von Kolbenbrennkraftmaschinen durch Veränderung des Ventilhubs |
| DE19810609A1 (de) * | 1998-03-12 | 1999-09-16 | Lsp Innovative Automotive Sys | Elektromagnetische Stelleinrichtung |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1138884B1 (fr) | 2019-01-30 |
| FR2804716B1 (fr) | 2002-05-10 |
| FR2804716A1 (fr) | 2001-08-10 |
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