EP2173999B1 - Device for generating radiofrequency plasma - Google Patents
Device for generating radiofrequency plasma Download PDFInfo
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- EP2173999B1 EP2173999B1 EP08827797.5A EP08827797A EP2173999B1 EP 2173999 B1 EP2173999 B1 EP 2173999B1 EP 08827797 A EP08827797 A EP 08827797A EP 2173999 B1 EP2173999 B1 EP 2173999B1
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- European Patent Office
- Prior art keywords
- voltage
- generator
- control unit
- plug
- voltage generator
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- 238000005259 measurement Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 description 11
- 230000006870 function Effects 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P9/00—Electric spark ignition control, not otherwise provided for
- F02P9/002—Control of spark intensity, intensifying, lengthening, suppression
- F02P9/007—Control of spark intensity, intensifying, lengthening, suppression by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P23/00—Other ignition
- F02P23/04—Other physical ignition means, e.g. using laser rays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
- F02P2017/121—Testing characteristics of the spark, ignition voltage or current by measuring spark voltage
Definitions
- the present invention relates generally to the field of radiofrequency plasma generating devices comprising spark plugs for initiating the combustion of fuel in a combustion chamber of an internal combustion engine.
- a device is known for example from the publication of a patent application FR 2,895,169 .
- the candles of radio frequency plasma generation devices are adapted to generate sparks or plasma to enable initiation of combustion.
- the mastery over time of the quality of sparks produced by a candle is therefore paramount.
- the present invention aims to provide a radiofrequency plasma generating device for controlling the quality of sparks produced by a radiofrequency candle.
- the radiofrequency plasma generation device of the invention is essentially characterized in that the electronic control unit comprises means for measuring the values representative of the evolution over time of the output voltage of the voltage generator, and in that the device comprises means for varying the voltage and / or the frequency of the electric current applied to said power supply terminal of the candle according to values measured by said measuring means.
- the device of the invention therefore makes it possible to change the supply voltage of a candle according to voltage evolution measurements which are representative of the state of wear or fouling of the candle or, for example , defective sparks (sharing, too small ).
- the supply voltage of a worn or fouled candle tends to decrease less quickly than the supply voltage of a new spark plug. It can therefore be envisaged thanks to the device of the invention to vary the voltage generated by the generator according to the state of the candle and in particular its ability to dissipate electrical energy to produce sparks. For example one can make sure to increase the nominal voltage setpoint that must provide the generator to a given candle.
- the electronic control unit it is possible for the electronic control unit to have means for comparing the measured values with theoretical values pre-recorded in a memory of the device.
- This embodiment makes it possible to check the state of a candle as a function of prerecorded values which have been measured by measurements on test bench of typical candles.
- the electronic control unit is electrically connected to said voltage generator and that the generator of voltage is adapted to vary the output voltage of the generator according to a control signal of the generator delivered by the electronic control unit.
- the invention enables the control unit receiving the output voltage measurements of the generator to process these measurements to generate a control signal from the generator so that the generator finally adapts its output voltage thereby improving the quality of the output. spark produced by the candle.
- the electronic control unit prefferably connected to said voltage generator and for the voltage generator to be adapted to vary the frequency of electrical current generated at the output of the generator as a function of a control signal. of the generator delivered by the electronic control unit.
- This embodiment allows the electrical control unit which receives the output voltage measurements from the generator to process these measurements to generate a control signal of the generator such that the generator finally adapts its output frequency.
- This embodiment improves the quality of the spark produced by the candle by adjusting the supply frequency.
- said switch it is possible for said switch to be adapted to vary the frequency of the electric current applied to said candle power terminal according to said signal. command generated by said electronic control unit.
- control signal of the switch is used to vary the frequency of the supply current of the spark plug.
- the radiofrequency plasma generation device may comprise several ignition assemblies of the predefined type, each switch of each ignition assembly being connected to said voltage generator and to said control unit.
- This embodiment makes it possible to control a plurality of spark plugs according to the same principle of measuring the evolution over time of the output voltage of the generator when one of the candles is powered and, depending on this measurement, to evaluate the spark plug. state of wear of this candle to possibly act on its supply voltage.
- each ignition assembly can receive a control signal specific to this ignition assembly.
- This characteristic makes it possible to independently control each switch of each ignition assembly and consequently makes it possible to control the supply delay of each spark plug and, if appropriate, the frequency of this power supply when the switch is adapted to vary the frequency as a function of the signal. clean.
- each switch is adapted to define the frequency of the electric current supplying the candle to which it is connected according to the own control signal that it receives.
- each switch is adapted to define the frequency of the electric current supplying the spark plug to which it is connected so that the frequency supplying this spark plug is equal to the frequency of the own control signal that it receives.
- said means for varying the voltage and / or the frequency of electric current to be adapted to vary as a function of the said values measured by the said measuring means, each of the voltages and / or the frequency of the currents. applied to the power terminals of each of the candles.
- the invention also relates to a method for controlling the plasma generating device according to the invention essentially characterized in that an electric supply current is applied to a power supply terminal of a spark plug, and then measured values representative of the evolution over time of the output voltage of the voltage generator and these measured values are compared with pre-recorded theoretical values and the supply voltage applied to the spark plug terminal is varied according to the observed difference between these measured values with pre-recorded theoretical values.
- the observation of the difference between the measured values representative of the evolution over time of the output voltage of the voltage generator and the pre-recorded theoretical values makes it possible to determine the state of a candle and in particular its transfer rate. 'energy.
- the theoretical value may be a parameter such as a rate of energy transfer which is a parameter evaluating the energy transfer speed of a new or model spark plug.
- the voltage generator 5 is supplied with direct current by a battery 2 and generates a variable voltage current available at the generator output.
- An ignition assembly 9 comprises a radiofrequency candle 4 and a switch 7 selectively connecting the radiofrequency candle 4 to the output of the voltage generator 5 so that the candle 4 is selectively powered.
- the switch 7 comprises a control terminal of the switch which is adapted to receive a control signal of the switch V1 (or V2, V3, V4 according to the ignition assembly concerned) and as a function of this signal to connect Electrically or not the generator 5 to a candle terminal 4.
- V1 or V2, V3, V4 according to the ignition assembly concerned
- the device A of the invention also comprises an electronic control unit UC which is connected to an engine control unit ECU CM with which it communicates in order to manage the ignition device A according to the needs of the engine equipped with this device. ignition of the invention.
- the electronic control unit UC is also connected to the voltage generator 5 so as to transmit control signals of the generator Sg.
- control signals Sg of the generator are interpreted by the generator which varies the generator output voltage according to the control signals Sg.
- control signal of the voltage generator Sg is a function for comparing at least one of the measured values (which are values representative of the evolution over time of the output voltage of the generator) with at least one set value prerecorded in a memory of the device. This comparison between a measured real value and a theoretical value makes it possible to determine the state of wear of the candle.
- the output voltage of the generator varies according to the measured state of wear of the spark plug 4 which must be powered or which is supplied by the generator.
- the electronic control unit UC is also connected to the output of the voltage generator 5 by a measurement circuit M measuring the electrical voltage at the generator output 5.
- the electronic control unit further comprises a memory in which are stored theoretical values representative of the energy transfer rate of a candle at different stages of its life.
- the electronic control unit UC also comprises a frequency generator, in this case a fixed frequency, which generates the different control signals V1 (V2, V3, V4) applied to the terminals of the switches 7 to which this frequency generator 8 is connected.
- This frequency is fixedly chosen to correspond to a resonant frequency of the candles so as to generate a plasma of large volume, in this case only the supply voltage is variable. .
- a rate of energy transfer is an example of a value representative of the evolution over time of the output voltage of the generator 5 which is connected to the candle transferring the energy produced by the generator.
- the electronic control unit 7 thus controls the generation of the sparks by transmitting a switch control signal V1 to the switch 7 which connects a spark plug terminal to the output 7 of the generator 5.
- the switch On receipt of this signal V1 the switch connects the power supply terminal of the candle 4 to the output of the generator 5 which produces an output voltage of value set by the control signal Sg of the generator.
- the spark plug 4 then generates sparks and discharges the energy at a certain speed which depends on the state of the spark plug 4.
- the electronic control unit UC receives voltage measurements M by means of measurement of values representative of the evolution of the generator output voltage 5.
- At least two measurements are made to determine the voltage decay rate at the generator output and more particularly the energy transfer rate of the powered spark plug.
- the electronic control unit UC performs an acquisition of the voltage at the output of the voltage booster 5 at the beginning of the turning on of the control stage 7, ie at the moment when the signal V1 is transmitted to the switch 7.
- This acquisition of value Vdebut_all (x) representative of the output voltage of the generator is performed at the beginning of the supply of the candle by the generator.
- V start_all (x) is stored in the memory of the control unit.
- the calculation unit 6 performs an acquisition of the output voltage of the spark plug. voltage booster 5.
- Vfin_all (x) representative of the generator output voltage shortly before stopping the supply of the spark plug is acquired is stored in the memory of the electronic control unit UC.
- This value representative of the wear rate of an order candle "x" is compared with theoretical values of energy transfer rate to generate a correction value for generating a control signal of the generator Sg fixing the voltage setpoint at the output of the generator at the beginning of the supply of a given candle "x".
- the correction value can be obtained by linear interpolation through a table that is a function of the "energy transfer rate".
- a table establishes a correspondence between a measured "energy transfer rate” and a theoretical “energy transfer rate” corresponding to a given correction value used to define a nominal output voltage setpoint of the generator.
- the corrective factor obtained via the data table can be added to the rated voltage setpoint for a new reference component in order to determine the new rated voltage setpoint at the output of the generator, this new setpoint taking account of the wear of the candle.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Plasma Technology (AREA)
Description
La présente invention concerne, de façon générale, le domaine des dispositif de génération de plasma radiofréquence comportant des bougies d'allumage pour initier la combustion de carburant dans une chambré de combustion d'un moteur à explosion. Un tel dispositif est connu par exemple de la publication de demande de brevet
Plus particulièrement, l'invention concerne un dispositif de génération de plasma radiofréquence comprenant :
- un générateur de tension ; et
- au moins un ensemble d'allumage, le dit ensemble d'allumage comportant :
- une bougie d'allumage adaptée à générer une étincelle lorsqu'un niveau de tension est appliqué sur cette bougie ; et
- un interrupteur disposé entre une borne d'alimentation de la bougie et une sortie du générateur de tension, l'interrupteur étant adapté pour relier électriquement et de façon sélective la sortie du générateur de tension à ladite borne d'alimentation de la bougie à réception d'un signal de commande appliqué sur une borne de commande dudit interrupteur ;
- a voltage generator; and
- at least one ignition assembly, said ignition assembly comprising:
- a spark plug adapted to generate a spark when a voltage level is applied to the spark plug; and
- a switch disposed between a power supply terminal of the spark plug and an output of the voltage generator, the switch being adapted to selectively and electrically connect the output of the voltage generator to said power supply terminal of the spark plug; a control signal applied to a control terminal of said switch;
Les bougies des dispositifs de génération de plasma radiofréquence sont adaptées pour générer des étincelles ou plasma afin de permettre d'initier une combustion. La maitrise dans le temps de la qualité des étincelles produites par une bougie est donc primordiale.The candles of radio frequency plasma generation devices are adapted to generate sparks or plasma to enable initiation of combustion. The mastery over time of the quality of sparks produced by a candle is therefore paramount.
Dans ce contexte, la présente invention a pour but de proposer un dispositif de génération de plasma radiofréquence permettant de maîtriser la qualité des étincelles produites par une bougie radiofréquence.In this context, the present invention aims to provide a radiofrequency plasma generating device for controlling the quality of sparks produced by a radiofrequency candle.
A cette fin, le dispositif de génération de plasma radiofréquence de l'invention, par ailleurs conforme à la définition générique qu'en donne le préambule défini précédemment, est essentiellement caractérisé en ce que l'unité électronique de commande comporte des moyens de mesure de valeurs représentatives de l'évolution dans le temps de la tension de sortie du générateur de tension, et en ce que le dispositif comporte des moyens de variation de la tension et/ou de la fréquence du courant électrique appliqué à ladite borne d'alimentation de la bougie en fonction de valeurs mesurées par lesdits moyens de mesure.For this purpose, the radiofrequency plasma generation device of the invention, moreover in accordance with the generic definition given in the preamble defined above, is essentially characterized in that the electronic control unit comprises means for measuring the values representative of the evolution over time of the output voltage of the voltage generator, and in that the device comprises means for varying the voltage and / or the frequency of the electric current applied to said power supply terminal of the candle according to values measured by said measuring means.
Ce nouveau dispositif est particulièrement avantageux car il permet :
- d'une part de mesurer des paramètres liés à l'évolution de la tension de sortie du générateur, cette évolution étant représentative de l'état de la bougie alimentée par le générateur ; et
- d'autre part de faire varier la tension et / ou la fréquence du courant électrique d'alimentation de cette bougie, sachant que cette tension et cette fréquence sont des paramètres déterminant la qualité de l'étincelle générée.
- on the one hand to measure parameters related to the evolution of the output voltage of the generator, this evolution being representative of the state of the candle fed by the generator; and
- on the other hand to vary the voltage and / or the frequency of the electric power supply of this candle, knowing that this voltage and this frequency are parameters determining the quality of the spark generated.
Le dispositif de l'invention permet donc de faire évoluer la tension d'alimentation d'une bougie en fonction de mesures d'évolution de tension qui sont représentatives de l'état d'usure ou d'encrassement de la bougie ou, par exemple, d'étincelles défaillantes (partage, trop petites...).The device of the invention therefore makes it possible to change the supply voltage of a candle according to voltage evolution measurements which are representative of the state of wear or fouling of the candle or, for example , defective sparks (sharing, too small ...).
En effet comme le montre la
On peut par exemple faire en sorte que l'unité électronique de commande comporte des moyens de comparaison des valeurs mesurées avec des valeurs théoriques préenregistrées dans une mémoire du dispositif.For example, it is possible for the electronic control unit to have means for comparing the measured values with theoretical values pre-recorded in a memory of the device.
Ce mode de réalisation permet de vérifier l'état d'une bougie en fonction de valeurs préenregistrées qui ont été mesurées par de mesures sur banc d'essai de bougies types.This embodiment makes it possible to check the state of a candle as a function of prerecorded values which have been measured by measurements on test bench of typical candles.
Selon l'invention, on fait en sorte que l'unité électronique de commande soit reliée électriquement audit générateur de tension et que le générateur de tension soit adapté à faire varier la tension de sortie du générateur en fonction d'un signal de commande du générateur délivré par l'unité électronique de commande.According to the invention, it is ensured that the electronic control unit is electrically connected to said voltage generator and that the generator of voltage is adapted to vary the output voltage of the generator according to a control signal of the generator delivered by the electronic control unit.
L'invention permet à l'unité de commande qui reçoit les mesures de tensions de sortie du générateur de traiter ces mesures afin de générer un signal de commande du générateur afin que celui-ci adapte finalement sa tension de sortie améliorant ainsi la qualité de l'étincelle produite par la bougie.The invention enables the control unit receiving the output voltage measurements of the generator to process these measurements to generate a control signal from the generator so that the generator finally adapts its output voltage thereby improving the quality of the output. spark produced by the candle.
On peut par exemple faire en sorte que l'unité électronique de commande soit reliée électriquement audit générateur de tension et que le générateur de tension soit adapté à faire varier la fréquence de courant électrique généré en sortie du générateur en fonction d'un signal de commande du générateur délivré par l'unité électronique de commande.For example, it is possible for the electronic control unit to be electrically connected to said voltage generator and for the voltage generator to be adapted to vary the frequency of electrical current generated at the output of the generator as a function of a control signal. of the generator delivered by the electronic control unit.
Ce mode de réalisation permet à l'unité électrique de commande qui reçoit les mesures de tensions de sortie du générateur de traiter ces mesures pour générer un signal de commande du générateur tel que le générateur adapte finalement sa fréquence de sortie. Ce mode de réalisation améliore la qualité de l'étincelle produite par la bougie par adaptation de la fréquence d'alimentation.This embodiment allows the electrical control unit which receives the output voltage measurements from the generator to process these measurements to generate a control signal of the generator such that the generator finally adapts its output frequency. This embodiment improves the quality of the spark produced by the candle by adjusting the supply frequency.
On peut par exemple faire en sorte que ledit interrupteur soit adapté à faire varier la fréquence du courant électrique appliqué à ladite borne d'alimentation de la bougie en fonction dudit signal de commande généré par ladite unité électronique de commande.For example, it is possible for said switch to be adapted to vary the frequency of the electric current applied to said candle power terminal according to said signal. command generated by said electronic control unit.
Dans ce mode de réalisation, le signal de commande de l'interrupteur est utilisé pour faire varier la fréquence du courant d'alimentation de la bougie.In this embodiment, the control signal of the switch is used to vary the frequency of the supply current of the spark plug.
On peut par exemple faire en sorte que le dispositif de génération de plasma radiofréquence comporte plusieurs ensembles d'allumage du type prédéfini, chaque interrupteur de chaque ensemble d'allumage étant relié audit générateur de tension et à ladite unité de commande.For example, it is possible for the radiofrequency plasma generation device to comprise several ignition assemblies of the predefined type, each switch of each ignition assembly being connected to said voltage generator and to said control unit.
Ce mode de réalisation permet de commander plusieurs bougies d'allumage selon le même principe de mesure de l'évolution dans le temps de la tension de sortie du générateur lorsqu'une des bougie est alimentée puis en fonction de cette mesure d'évaluer l'état d'usure de cette bougie pour éventuellement agir sur sa tension d'alimentation.This embodiment makes it possible to control a plurality of spark plugs according to the same principle of measuring the evolution over time of the output voltage of the generator when one of the candles is powered and, depending on this measurement, to evaluate the spark plug. state of wear of this candle to possibly act on its supply voltage.
On peut par exemple faire en sorte que chaque ensemble d'allumage reçoive un signal de commande propre à cet ensemble d'allumage.For example, it is possible for each ignition assembly to receive a control signal specific to this ignition assembly.
Cette caractéristique permet de commander indépendamment chaque interrupteur de chaque ensemble d'allumage et par conséquent permet de commander le délai d'alimentation de chaque bougie et éventuellement la fréquence de cette alimentation lorsque l'interrupteur est adapté à faire varier la fréquence en fonction du signal propre.This characteristic makes it possible to independently control each switch of each ignition assembly and consequently makes it possible to control the supply delay of each spark plug and, if appropriate, the frequency of this power supply when the switch is adapted to vary the frequency as a function of the signal. clean.
Dans un mode de réalisation préférentiel associé au précédent on fait en sorte que chaque interrupteur soit adapté à définir la fréquence du courant électrique alimentant la bougie à laquelle il est relié en fonction du signal de commande propre qu'il reçoit.In a preferred embodiment associated with the preceding one is made so that each switch is adapted to define the frequency of the electric current supplying the candle to which it is connected according to the own control signal that it receives.
Préférentiellement chaque interrupteur est adapté à définir la fréquence du courant électrique alimentant la bougie à laquelle il est relié de manière à ce que la fréquence alimentant cette bougie soit égale à la fréquence du signal de commande propre qu'il reçoit.Preferably each switch is adapted to define the frequency of the electric current supplying the spark plug to which it is connected so that the frequency supplying this spark plug is equal to the frequency of the own control signal that it receives.
On peut par exemple faire en sorte que lesdits moyens de variation de la tension et/ou de la fréquence de courant électrique soient adaptés pour faire varier en fonction des dites valeurs mesurées par lesdits moyens de mesure, chacune des tensions et/ou fréquence des courants électriques appliqués aux bornes d'alimentation de chacune des bougies.For example, it is possible for said means for varying the voltage and / or the frequency of electric current to be adapted to vary as a function of the said values measured by the said measuring means, each of the voltages and / or the frequency of the currents. applied to the power terminals of each of the candles.
L'invention concerne également un procédé de commande du dispositif de génération de plasma selon l'invention essentiellement caractérisé en ce qu'on applique un courant électrique d'alimentation à une borne d'alimentation d'une bougie d'allumage, puis on mesure des valeurs représentatives de l'évolution dans le temps de la tension de sortie du générateur de tension et on compare ces valeurs mesurées avec des valeurs théoriques préenregistrées et on fait varier la tension d'alimentation appliquée à la borne de la bougie en fonction de l'écart constaté entre ces valeurs mesurées avec des valeurs théoriques préenregistrées. L'observation de l'écart entre les valeurs mesurées représentatives de l'évolution dans le temps de la tension de sortie du générateur de tension et des valeurs théoriques préenregistrées permet de déterminer l'état d'une bougie et notamment son taux de transfert d'énergie. Il est à noter que la valeur théorique peut être un paramètre tel qu'un taux de transfert d'énergie qui est un paramètre évaluant la vitesse de transfert d'énergie d'une bougie neuve ou modèle.The invention also relates to a method for controlling the plasma generating device according to the invention essentially characterized in that an electric supply current is applied to a power supply terminal of a spark plug, and then measured values representative of the evolution over time of the output voltage of the voltage generator and these measured values are compared with pre-recorded theoretical values and the supply voltage applied to the spark plug terminal is varied according to the observed difference between these measured values with pre-recorded theoretical values. The observation of the difference between the measured values representative of the evolution over time of the output voltage of the voltage generator and the pre-recorded theoretical values makes it possible to determine the state of a candle and in particular its transfer rate. 'energy. It should be noted that the theoretical value may be a parameter such as a rate of energy transfer which is a parameter evaluating the energy transfer speed of a new or model spark plug.
Grâce à cette détermination de l'état de la bougie on fait varier en conséquence la tension d'alimentation de cette bougie de manière à en améliorer le fonctionnement de cette bougie. En l'occurrence on peut augmenter la consigne de tension nominale du générateur au fur et à mesure de l'usure / encrassement de la bougie, c'est-à-dire au fur et à mesure de la diminution du taux de transfert d'énergie de cette bougie.With this determination of the state of the candle is varied accordingly the supply voltage of the candle so as to improve the operation of this candle. In this case, it is possible to increase the nominal voltage setpoint of the generator as the spark plug wear / fouling progresses, that is to say as the transfer rate of the spark plug decreases. energy of this candle.
En d'autres termes, en fonction de l'état constaté de la bougie on peut décider d'appliquer à cette bougie une tension d'alimentation différente de ce appliquée lors des première et seconde mesures.In other words, depending on the state of the candle it can be decided to apply to this candle a supply voltage different from that applied during the first and second measurements.
D'autres caractéristiques et avantages de l'invention ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels:
- la
figure 1 représente le dispositif de génération de plasma de l'invention ; - la
figure 2 représente deux courbes d'évolution de la tension de sortie du générateur de tension en fonction du temps pour une bougie neuve et pour une bougie usée.
- the
figure 1 represents the plasma generating device of the invention; - the
figure 2 represents two curves of evolution of the output voltage of the voltage generator as a function of time for a new spark plug and for a worn spark plug.
Comme annoncé précédemment, l'invention concerne un dispositif de génération de plasma radiofréquence A comprenant :
- un générateur de
tension 5; et - plusieurs ensembles d'allumage 9 sensiblement identiques entre eux.
- a
voltage generator 5; and - several ignition assemblies 9 substantially identical to each other.
Le générateur de tension 5 est alimenté en courant continu par une batterie 2 et génère un courant de tension variable disponible en sortie de générateur.The
Un ensemble d'allumage 9 comporte une bougie radiofréquence 4 et un interrupteur 7 reliant sélectivement la bougie radiofréquence 4 à la sortie du générateur de tension 5 de façon à ce que cette bougie 4 soit alimentée sélectivement.An
L'interrupteur 7 comporte une borne de commande de l'interrupteur qui est adaptée pour recevoir un signal de commande de l'interrupteur V1 (ou V2, V3, V4 selon l'ensemble d'allumage concerné) et en fonction de ce signal relier électriquement ou non le générateur 5 à une borne de bougie 4. Lorsque la bougie 4 reçoit une tension d'alimentation suffisante du générateur 5, celle-ci génère des étincelles formant un plasma et la tension en sortie du générateur 5 décroit dans le temps tout au long de la période de génération d'étincelles.The
Le dispositif A de l'invention comporte également une unité électronique de commande UC qui est reliée à une unité de commande moteur ECU CM avec laquelle elle communique afin de gérer le dispositif d'allumage A en fonction des besoins du moteur doté de ce dispositif d'allumage de l'invention.The device A of the invention also comprises an electronic control unit UC which is connected to an engine control unit ECU CM with which it communicates in order to manage the ignition device A according to the needs of the engine equipped with this device. ignition of the invention.
L'unité électronique de commande UC est également reliée au générateur de tension 5 de manière à transmettre des signaux de commande du générateur Sg.The electronic control unit UC is also connected to the
Ces signaux de commande Sg du générateur sont interprétés par le générateur qui fait varier la tension de sortie de générateur en fonction des signaux de commande Sg.These control signals Sg of the generator are interpreted by the generator which varies the generator output voltage according to the control signals Sg.
En l'occurrence on fait en sorte que le signal de commande du générateur de tension Sg soit une fonction de comparaison de l'une au moins des valeurs mesurées (qui sont des valeurs représentatives de l'évolution dans le temps de la tension en sortie du générateur) avec au moins une valeur de consigne préenregistrée dans une mémoire du dispositif. Cette comparaison entre une valeur réelle mesurée et une valeur théorique permet de déterminer l'état d'usure de la bougie.In this case, it is arranged that the control signal of the voltage generator Sg is a function for comparing at least one of the measured values (which are values representative of the evolution over time of the output voltage of the generator) with at least one set value prerecorded in a memory of the device. This comparison between a measured real value and a theoretical value makes it possible to determine the state of wear of the candle.
Ainsi la tension de sortie du générateur varie en fonction de l'état d'usure mesuré de la bougie 4 qui doit être alimentée ou qui est alimentée par le générateur.Thus, the output voltage of the generator varies according to the measured state of wear of the
L'unité de commande électronique UC est également reliée à la sortie du générateur de tension 5 par un circuit de mesure M effectuant des mesures de la tension électrique en sortie de générateur 5.The electronic control unit UC is also connected to the output of the
L'unité de commande électronique comporte en outre une mémoire dans laquelle sont stockées des valeurs théoriques représentatives du taux de transfert d'énergie d'une bougie à différents stades de sa vie.The electronic control unit further comprises a memory in which are stored theoretical values representative of the energy transfer rate of a candle at different stages of its life.
Dans un mode particulier de réalisation de l'invention l'unité de commande électronique UC comporte également un générateur de fréquence en l'occurrence d'une fréquence fixe qui génère les différents signaux V1 (V2, V3, V4) de commande appliqués sur les bornes des l'interrupteurs 7 auxquels est relié ce générateur de fréquence 8. Cette fréquence est choisie fixe pour correspondre à une fréquence de résonance des bougies de manière à générer un plasma de volume important, en ce cas seule la tension d'alimentation est variable.In a particular embodiment of the invention, the electronic control unit UC also comprises a frequency generator, in this case a fixed frequency, which generates the different control signals V1 (V2, V3, V4) applied to the terminals of the
Il est à noter qu'un taux de transfert d'énergie est un exemple de valeur représentative de l'évolution dans le temps de la tension de sortie du générateur 5 qui est relié à la bougie transférant l'énergie produite par le générateur.It should be noted that a rate of energy transfer is an example of a value representative of the evolution over time of the output voltage of the
L'unité de commande électronique 7 commande donc la génération des étincelles en transmettant un signal de commande d'interrupteur V1 à l'interrupteur 7 qui relie une borne de bougie à la sortie 7 du générateur 5.The
A réception de ce signal V1 l'interrupteur relie la borne d'alimentation de la bougie 4 à la sortie du générateur 5 qui produit une tension de sortie de valeur fixée par le signal Sg de commande du générateur.On receipt of this signal V1 the switch connects the power supply terminal of the
La bougie 4 génère alors des étincelles et décharge de l'énergie à une certaine vitesse qui dépend de l'état de la bougie 4.The
Il est à noter que le fonctionnement d'une bougie 4 à radiofréquence dépend de :
- la fréquence de résonance de la bougie 4 qui varie selon l'état d'usure de cette bougie,
- la tension de consigne de début d'allumage fixée par calibration, c'est-à-dire la tension de sortie délivrée par le générateur 5 ;
- la durée d'étincelle fixée par calibration.
- the resonant frequency of the
candle 4 which varies according to the state of wear of this candle, - the set ignition start voltage set by calibration, that is to say the output voltage delivered by the
generator 5; - the duration of spark fixed by calibration.
Comme on peut le voir sur la
On constate que la vitesse de déchéance de tension est supérieure pour la bougie neuve par rapport à la bougie usée.As can be seen on the
It is found that the speed of lapse of tension is higher for the new spark plug compared to the used spark plug.
L'unité de commande électronique UC reçoit des mesures de tension M grâce à des moyens de mesure de valeurs représentatives de l'évolution de la tension en sortie de générateur 5.The electronic control unit UC receives voltage measurements M by means of measurement of values representative of the evolution of the
Au moins deux mesures sont effectuées pour déterminer la vitesse de déchéance de tension en sortie de générateur et plus particulièrement le taux de transfert d'énergie de la bougie alimentée.At least two measurements are made to determine the voltage decay rate at the generator output and more particularly the energy transfer rate of the powered spark plug.
Plus précisément l'unité de commande électronique UC réalise une acquisition de la tension en sortie de l'élévateur de tension 5 au début de la mise en conduction de l'étage de commande 7 c'est-à-dire au moment où le signal V1 est transmis à l'interrupteur 7. Cette acquisition de valeur Vdébut_all(x) représentative de la tension de sortie du générateur est réalisée au début de l'alimentation de la bougie par le générateur. Vdébut_all(x) est mémorisée dans la mémoire de l'unité de commande.More precisely, the electronic control unit UC performs an acquisition of the voltage at the output of the
Lorsque l'interrupteur ou étage de commande 7 cesse de relier la bougie 4 à la sortie de générateur 5, après un temps égal à la durée d'étincelle, l'unité de calcul 6 réalise une acquisition de la tension de sortie de l'élévateur de tension 5.When the switch or control
La valeur Vfin_all(x) représentative de la tension de sortie de générateur peu avant l'arrêt de l'alimentation de la bougie est acquise est mémorisée dans la mémoire de l'unité de commande électronique UC.The value Vfin_all (x) representative of the generator output voltage shortly before stopping the supply of the spark plug is acquired is stored in the memory of the electronic control unit UC.
Il est à noter que ces moments de début et de fin sont facilement calculables puisqu'ils sont déterminés par l'unité de commande elle-même qui commande l'interrupteur 7, via le signal V1.It should be noted that these start and end times are easily calculable since they are determined by the control unit itself which controls the
Etant donné qu'il y a plusieurs ensembles d'allumage 9, « x » représente le numéros d'ordre des bougies multi étincelles des cylindres n°1, 2, 3 et 4 d'un moteur à quatre cylindres.Since there are
Après avoir mémorisé pour chaque bougie d'ordre « x » les valeurs de tension Vdébut_all(x) et Vfin_all(x) on calcule alors pour chaque bougie une valeur représentative de l'évolution dans le temps de la tension en sortie de générateur, c'est-à-dire représentative de la tension d'alimentation de chaque bougie d'ordre « x ».After having memorized for each order candle "x" the voltage values V start (x) and V fin_all (x), then for each candle, a value representative of the evolution over time of the generator output voltage is calculated, c that is, representative of the supply voltage of each order candle "x".
En l'occurrence cette valeur représentative est le
Cette valeur représentative du taux d'usure de d'une bougie d'ordre « x » est comparée avec des valeurs théoriques de taux de transfert d'énergie pour générer une valeur de correction permettant de générer un signal de commande du générateur Sg fixant la consigne de tension en sortie du générateur au moment du début de l'alimentation d'une bougie « x » donnée.This value representative of the wear rate of an order candle "x" is compared with theoretical values of energy transfer rate to generate a correction value for generating a control signal of the generator Sg fixing the voltage setpoint at the output of the generator at the beginning of the supply of a given candle "x".
La valeur de correction peut-être en l'occurrence obtenue par une interpolation linéaire à travers une table fonction du « taux de transfert d'énergie». Une telle table établie une correspondance entre un « taux de transfert d'énergie» mesuré et un « taux de transfert d'énergie » théorique auquel correspond une valeur de correction donnée utilisée pour définir une consigne de tension de sortie nominale du générateur.In this case, the correction value can be obtained by linear interpolation through a table that is a function of the "energy transfer rate". Such a table establishes a correspondence between a measured "energy transfer rate" and a theoretical "energy transfer rate" corresponding to a given correction value used to define a nominal output voltage setpoint of the generator.
Par exemple on peut additionner le facteur correctif obtenu via la table de données à la consigne de tension nominale pour un composant de référence neuf afin de déterminer la nouvelle consigne de tension nominale en sortie du générateur, cette nouvelle consigne tenant compte de l'usure de la bougie.For example, the corrective factor obtained via the data table can be added to the rated voltage setpoint for a new reference component in order to determine the new rated voltage setpoint at the output of the generator, this new setpoint taking account of the wear of the candle.
Claims (9)
- Device for generating radiofrequency plasma (A) comprising:- a voltage generator (5); and- at least one ignition assembly (9) comprising a spark plug (4) suitable for generating a spark between two electrodes of the plug when a voltage level is applied to this plug (4); and- an electronic control unit (UC) suitable for generating a control signal (V1), the electronic control unit (UC) includes means (M) of measuring values representative of the trend over time of the output voltage from the voltage generator (5), characterized in that the ignition assembly comprises a switch (7) positioned between a power supply terminal of the plug (4) and an output of the voltage generator (5), the switch (7) being suitable for electrically and selectively connecting the output of the voltage generator (5) to said power supply terminal of the plug (4) upon receipt of said control signal (V1) applied to a control terminal of said switch (7), said control terminal being electrically connected to the electronic control unit (UC), in that the device includes means of varying the voltage of the electrical current applied to said power supply terminal of the plug according to values measured by said measuring means (M), and in that the electronic control unit (UC) is electrically connected to said one voltage generator (5) and the voltage generator (5) is suitable for varying the output voltage of the generator according to a control signal for the generator (Sg) delivered by the electronic control unit (UC).
- Device for generating radiofrequency plasma according to Claim 1, characterized in that the electronic control unit (UC) includes means of comparing measured values with theoretical values prestored in a memory of the device.
- Device for generating radiofrequency plasma according to either one of the preceding claims, characterized in that the electronic control unit (UC) is electrically connected to said voltage generator (5) and in that the voltage generator is suitable for varying the frequency of the electrical current generated at the output of the generator (5) according to a control signal for the generator (Sg) delivered by the electronic control unit (UC).
- Device for generating radiofrequency plasma according to any one of the preceding claims, characterized in that said switch (7) is suitable for varying the frequency of the electrical current applied to said power supply terminal of the plug (4) according to said control signal (V1) generated by said electronic control unit (UC).
- Device for generating radiofrequency plasma according to any one of the preceding claims, characterized in that it includes a number of ignition assemblies (9) of the predefined type, each switch (7) of each ignition assembly being connected to said voltage generator (5) and to said control unit (UC).
- Device for generating radiofrequency plasma according to Claim 5, characterized in that each ignition assembly (9) receives a control signal (V1, V2, V3, V4) specific to this ignition assembly (9).
- Device for generating radiofrequency plasma according to Claim 5, characterized in that said means of varying the voltage and/or the frequency of the electrical current are suitable for varying, according to said values measured by said measuring means (M), each of the voltages and/or frequencies of the electrical currents applied to the power supply terminals of each of the plugs (4).
- Method of controlling the device for generating plasma according to any one of the preceding claims, characterized in that an electrical power supply current is applied to a power supply terminal of a spark plug (4), then values representative of the trend over time of the output voltage of the voltage generator (5) are measured and these measured values are compared with prestored theoretical values and the power supply voltage applied to the terminal of the plug (4) is varied according to the difference observed between these measured values and prestored theoretical values.
- Method of controlling the device for generating plasma according to Claim 8, characterized in that, to measure values representative of the trend over time of the output voltage of the voltage generator (5), a first measurement of the output voltage of the voltage generator is taken from the moment when a given plug of the device starts to be powered (Vstart_all(x)) then, after said first measurement, a second measurement of the output voltage of the voltage generator is taken before interrupting the power supply to this plug (Vend_all(x)).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0705773A FR2919901B1 (en) | 2007-08-08 | 2007-08-08 | RADIOFREQUENCY PLASMA GENERATION DEVICE |
PCT/FR2008/051433 WO2009024713A1 (en) | 2007-08-08 | 2008-07-30 | Device for generating radiofrequency plasma |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2173999A1 EP2173999A1 (en) | 2010-04-14 |
EP2173999B1 true EP2173999B1 (en) | 2016-09-07 |
Family
ID=39204603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08827797.5A Not-in-force EP2173999B1 (en) | 2007-08-08 | 2008-07-30 | Device for generating radiofrequency plasma |
Country Status (10)
Country | Link |
---|---|
US (1) | US8656897B2 (en) |
EP (1) | EP2173999B1 (en) |
JP (1) | JP5238026B2 (en) |
KR (1) | KR20100052473A (en) |
CN (1) | CN101815859B (en) |
BR (1) | BRPI0815098A2 (en) |
FR (1) | FR2919901B1 (en) |
MX (1) | MX2010001514A (en) |
RU (1) | RU2474723C2 (en) |
WO (1) | WO2009024713A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009059649B4 (en) * | 2009-12-19 | 2011-11-24 | Borgwarner Beru Systems Gmbh | HF ignition device |
JP2012159033A (en) * | 2011-01-31 | 2012-08-23 | Imagineering Inc | Engine |
JP5907149B2 (en) * | 2013-11-28 | 2016-04-20 | 株式会社デンソー | Control device for internal combustion engine |
GB2584435B (en) * | 2019-05-31 | 2022-01-26 | Caterpillar Energy Solutions Gmbh | Method and system for detecting a component exchange in an ignition system of a spark-ignited engine |
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JPS5756668A (en) * | 1980-09-18 | 1982-04-05 | Nissan Motor Co Ltd | Plasma igniter |
JPS62135668A (en) * | 1985-12-06 | 1987-06-18 | Nippon Denso Co Ltd | Device for preventing smoldering of ignition plug |
GB8600270D0 (en) * | 1986-01-07 | 1986-02-12 | Lucas Ind Plc | Pulse generating circuit |
EP0344349B1 (en) * | 1988-06-03 | 1994-12-07 | Robert Bosch Gmbh | Detecting misfiring in spark ignition engines |
FR2649759B1 (en) * | 1989-07-13 | 1994-06-10 | Siemens Bendix Automotive Elec | IGNITION DEVICE FOR INTERNAL COMBUSTION ENGINE |
US5815047A (en) * | 1993-10-29 | 1998-09-29 | Applied Materials, Inc. | Fast transition RF impedance matching network for plasma reactor ignition |
RU2106518C1 (en) * | 1995-01-11 | 1998-03-10 | Уфимское агрегатное конструкторское бюро "Молния" | Capacitor-type ignition system of gas-turbine engine |
US5775298A (en) * | 1996-12-09 | 1998-07-07 | General Motors Corporation | Internal combustion engine control |
JP2000038978A (en) * | 1998-07-21 | 2000-02-08 | Yanmar Diesel Engine Co Ltd | Ignition device for internal combustion engine |
US6135099A (en) * | 1999-02-26 | 2000-10-24 | Thomas C. Marrs | Ignition system for an internal combustion engine |
US6112730A (en) * | 1999-02-26 | 2000-09-05 | Thomas C. Marrs | Ignition system with clamping circuit for use in an internal combustion engine |
RU2256091C2 (en) * | 1999-10-06 | 2005-07-10 | Роберт Бош Гмбх | Method and device for internal combustion engine ignition |
DE19953710B4 (en) * | 1999-11-08 | 2010-06-17 | Robert Bosch Gmbh | Method and device for measurement window positioning for ion current measurement |
US6424232B1 (en) * | 1999-11-30 | 2002-07-23 | Advanced Energy's Voorhees Operations | Method and apparatus for matching a variable load impedance with an RF power generator impedance |
DE10003109A1 (en) * | 2000-01-26 | 2001-08-02 | Bosch Gmbh Robert | Method for generating a sequence of high-voltage ignition sparks and high-voltage ignition device |
FR2827916B1 (en) * | 2001-07-25 | 2003-10-31 | Inst Francais Du Petrole | METHOD FOR CONTROLLING THE IGNITION PARAMETERS OF A SPARK PLUG FOR AN INTERNAL COMBUSTION ENGINE AND IGNITION DEVICE USING SUCH A METHOD |
FR2859830B1 (en) * | 2003-09-12 | 2014-02-21 | Renault Sas | PLASMA GENERATION CANDLE WITH INTEGRATED INDUCTANCE. |
FR2859869B1 (en) * | 2003-09-12 | 2006-01-20 | Renault Sa | PLASMA GENERATION SYSTEM. |
JP4320630B2 (en) * | 2004-10-22 | 2009-08-26 | 株式会社デンソー | Engine control system |
DE102005036968A1 (en) * | 2005-08-05 | 2007-02-15 | Siemens Ag | Plasma ignition system and method of operation |
US7121270B1 (en) * | 2005-08-29 | 2006-10-17 | Vimx Technologies Inc. | Spark generation method and ignition system using same |
FR2895169B1 (en) * | 2005-12-15 | 2008-08-01 | Renault Sas | OPTIMIZING THE EXCITATION FREQUENCY OF A RESONATOR |
FR2895170B1 (en) * | 2005-12-15 | 2008-03-07 | Renault Sas | OPTIMIZING THE EXCITATION FREQUENCY OF A RESONATOR |
WO2007121391A2 (en) * | 2006-04-14 | 2007-10-25 | Federal-Mogul Corporation | Spark plug circuit |
-
2007
- 2007-08-08 FR FR0705773A patent/FR2919901B1/en not_active Expired - Fee Related
-
2008
- 2008-07-30 MX MX2010001514A patent/MX2010001514A/en active IP Right Grant
- 2008-07-30 CN CN200880102481XA patent/CN101815859B/en not_active Expired - Fee Related
- 2008-07-30 BR BRPI0815098-2A2A patent/BRPI0815098A2/en not_active IP Right Cessation
- 2008-07-30 US US12/672,286 patent/US8656897B2/en active Active
- 2008-07-30 KR KR1020107002795A patent/KR20100052473A/en active IP Right Grant
- 2008-07-30 WO PCT/FR2008/051433 patent/WO2009024713A1/en active Application Filing
- 2008-07-30 JP JP2010519495A patent/JP5238026B2/en not_active Expired - Fee Related
- 2008-07-30 RU RU2010108323/07A patent/RU2474723C2/en active
- 2008-07-30 EP EP08827797.5A patent/EP2173999B1/en not_active Not-in-force
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US8656897B2 (en) | 2014-02-25 |
FR2919901A1 (en) | 2009-02-13 |
EP2173999A1 (en) | 2010-04-14 |
BRPI0815098A2 (en) | 2015-02-18 |
KR20100052473A (en) | 2010-05-19 |
RU2010108323A (en) | 2011-09-20 |
JP2010535976A (en) | 2010-11-25 |
WO2009024713A1 (en) | 2009-02-26 |
FR2919901B1 (en) | 2010-02-26 |
CN101815859B (en) | 2012-05-30 |
WO2009024713A9 (en) | 2009-04-23 |
MX2010001514A (en) | 2010-03-10 |
US20110163673A1 (en) | 2011-07-07 |
CN101815859A (en) | 2010-08-25 |
RU2474723C2 (en) | 2013-02-10 |
JP5238026B2 (en) | 2013-07-17 |
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