EP2411659A1 - Method for igniting a combustible mixture for a combustion engine - Google Patents

Method for igniting a combustible mixture for a combustion engine

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Publication number
EP2411659A1
EP2411659A1 EP10715975A EP10715975A EP2411659A1 EP 2411659 A1 EP2411659 A1 EP 2411659A1 EP 10715975 A EP10715975 A EP 10715975A EP 10715975 A EP10715975 A EP 10715975A EP 2411659 A1 EP2411659 A1 EP 2411659A1
Authority
EP
European Patent Office
Prior art keywords
signal
spark
duration
mixture
spark plug
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10715975A
Other languages
German (de)
French (fr)
Other versions
EP2411659B1 (en
Inventor
Maxime Makarov
Frederic Auzas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
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Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP2411659A1 publication Critical patent/EP2411659A1/en
Application granted granted Critical
Publication of EP2411659B1 publication Critical patent/EP2411659B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/08—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits having multiple-spark ignition, i.e. ignition occurring simultaneously at different places in one engine cylinder or in two or more separate engine cylinders
    • 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
    • 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

Definitions

  • the present invention relates, in general, to an ignition process for a heat engine.
  • radio frequency spark plugs adapted to generate a branched spark from the tip of an electrode.
  • radiofrequency spark plugs are adapted, in particular by the shape and arrangement of their electrodes, to generate a branched spark when this electrode is powered using an alternating electric signal of higher frequency 1 MHz.
  • a branched spark produced by a radiofrequency candle is more likely to ignite a mixture of oxidant and fuel than a linear spark from a conventional candle, since the branched spark extends into a zone of volume greater than the area in which extends the linear spark produced by a conventional candle.
  • the invention therefore relates more particularly to a method for igniting a mixture of oxidant and fuel in a combustion chamber of a combustion engine using a radiofrequency spark plug generating a branched spark from the tip of an electrode, the spark plug being arranged to open into said combustion chamber of the engine, the method comprising a first step of feeding said spark plug to the using a first AC signal of higher frequency 1 MHz.
  • the document FR2913297 proposes a method of ignition using a radiofrequency ignition plug in which a resonator is controlled during ignition by means of a control signal in the form of a plurality of transmission trains. pulses, each train having a very short duration, for example from 5 to 10 ⁇ s. This command consists in making multi-ignitions.
  • supply of the candle consists of feeding the electrode of the candle with a tip using a higher frequency alternating electric signal. at lMhz, in this case it is a supply of the pointed electrode by alternative signals hereinafter called the first and second alternative electrical signals.
  • This type of ignition process performed by supplying at least one spark plug with an AC electrical signal with a frequency greater than 1 MHz is known as a radiofrequency ignition process.
  • the ignition method of the invention is essentially characterized in that it comprises a second step of feeding said spark plug to using a second signal alternating electric frequency higher than 1 MHz, this second step being subsequent to the first step and being spaced in time with respect to the first step of a spacing period.
  • the spark produced by the candle when powered with an electrical signal of frequency greater than 1 MHz has a shape that branches in the mixture and generally has several branches.
  • the spark has several portions whose diameter decreases going from the origin of the spark (that is to say at the point where the spark ignites) towards its ends (the place where the spark ceases to spread). It has been noticed that the temperature of the spark varies along the spark and decreases with the diameter of the spark portions. The flame in the mixture is initiated at the hottest spots of the mixture, i.e. at the spark portions that have the largest diameters. It has also been found that when two sparks are triggered consecutively and prior to ignition of the mixture, the second spark occurs substantially at the same location as the first spark while having fewer branches.
  • the mixture is preheated in the vicinity of the sparks produced by the first step, then thanks to the second step, producing less branched sparks, the temperature rise continues beyond the temperature obtained by the first step and this to initiate combustion.
  • the mixing volume in which the combustion caused by the second stage is initiated is therefore greater than the volume of mixture which would be ignited via the first step alone.
  • the ignition of the mixture present in the combustion chamber is initiated by at least two distinct signals of respective frequencies greater than 1 MHz which generate respectively at least two radiofrequency sparks.
  • the volume of inflamed mixture is greater than it would be if the ignition was initiated by a single electrical signal.
  • the invention thus makes it possible to reduce the number of ignition misfires and the unburnt fuel volume while increasing the flame propagation speed in the chamber.
  • said spacing time between the first and second steps is less than 10 times the duration of the first step and preferably less than 5 times the duration of the first step.
  • This feature limits the delay between the two candle power signals so as to minimize the risk of cooling the mixture preheated by the first spark, which is a condition that improves the size of the ignited mixture volume.
  • the spacing interval between the first and second steps is greater than the duration of the first step.
  • this minimum delay condition between the two stages / sparks makes it possible to reduce the number of branches of the second spark relative to the first spark. Allowing for an extension of the branches and an increase in the average diameter of the branches of the second spark relative to the first spark. This average diameter is calculated over the length of a given spark branch. It can also be ensured that the spacing interval between the first and second steps is between 1 and 5 times the duration of the first step.
  • said first and second signals have respective frequencies preferably greater than 1 MHz
  • each of said first and second electrical signals has specific parameters such as the voltage amplitude of the signal U, the frequency of the alternating electric signal F, the total duration of the signal D, and that one at least parameters of at least one of said first and second signals are determined during a step prior to said first and second steps as a function of parameters determining the combustion, these parameters determining the combustion being measured and / or estimated and comprising at least one pressure in the combustion chamber P, a temperature T representative of the temperature inside the chamber, the richness of the mixture of fuel and oxidant, and a rate of burnt gases present in the mixture.
  • Determining at least one of the parameters of at least one of the first and second signals as a function of operating characteristics of the engine makes it possible to adapt the nature of the spark produced during the first and / or second step depending on the conditions prevailing in the chamber which optimizes the ignition conditions.
  • the duration of the first step is between 150 and 250 ⁇ s
  • that the duration of the second step is between 150 and 250 ⁇ s and that said spacing interval between the first and second stages is included. between 250 and 750 ⁇ .
  • the first signal is emitted during the entire first step and only during this first step.
  • the second signal is emitted during the entire second step and only during this second step.
  • the formation time of the flame front core in the combustion chamber is about 2000 ⁇ s, which is particularly fast and that while increasing the rate of ignition successful.
  • the invention also relates to a system for igniting a mixture of oxidant and fuel for a heat engine comprising a current generator and at least one spark plug connected to said generator, said generator being adapted to generate a first signal alternating current of 1 MHz higher frequency and a second AC electrical signal of greater frequency 1 MHz.
  • the system of the invention is characterized in that said generator is adapted to space in time said first and second AC electrical signals with a spacing delay and is adapted to the implementation of the method according to the invention.
  • the first and second signals generated by the current generator are such that they allow the generation, via the candle thus supplied, of sparks spaced apart from each other by the predetermined spacing time delay.
  • the invention also relates to a combustion engine comprising a combustion chamber and the aforementioned ignition system.
  • FIG. 1 represents a view of a peak candle system according to the invention and allowing the implementation of the method according to the invention, and respective zones “a” and “b” having the zones of ignition without the method of the invention (zone “a” ) and with the method of the invention (zone “b”), the zone “b” being greater than the zone ". at ";
  • FIG. 1 represents a view of a peak candle system according to the invention and allowing the implementation of the method according to the invention, and respective zones “a” and “b” having the zones of ignition without the method of the invention (zone “a” ) and with the method of the invention (zone “b”), the zone “b” being greater than the zone “. at “;
  • FIG. 1 represents a view of a peak candle system according to the invention and allowing the implementation of the method according to the invention, and respective zones “a” and “b” having the zones of ignition without the method of the invention (zone “a” ) and with the method of the invention (zone “b”), the zone “b” being greater
  • FIG. 2 shows a time curve of supply of the candle with the abscissa and the ordinate the intensity of the supply signal of the candle, said first and second electrical supply signals of the candle as well as the delay of spacing between these signals are shown in this Figure 2, which therefore describes the signal phasing required to implement the method of the invention
  • FIG. 3 shows the detail of one of the signals represented in FIG. 2, this signal possibly being the first or the second signal because these signals are, in this particular embodiment, identical to each other;
  • FIG. 4a shows a spark emitted when the spark plug receives a first high frequency power supply signal greater than 1 MHz, in this case this first signal is here 5 MHz;
  • FIG. 4b shows a spark emitted when the spark plug receives a second high frequency power supply signal greater than 1 MHz, in this case this second signal is here 5 MHz, this spark of FIG. 4b is less branched than that of FIG. of Figure 4a and an amplitude and a width of spark branch greater than they are in Figure 4a;
  • FIG. 5a represents the flame zone initiated by a single RF radiofrequency spark as is the case in the prior art (FIG. Aa);
  • FIG. 5b represents the flame zone initiated with the method according to the invention which generates two consecutive RF radiofrequency sparks (FIG. 4b) and spaced apart with respect to time, it can be seen that this flame zone of FIG. extent than that of Figure 5a.
  • the invention relates to a method for igniting a mixture of oxidant and fuel in a combustion chamber using a spark plug and the ignition system 10 for carrying out the method according to the invention and a motor including this system.
  • first and second AC electrical signals 4, 5 of frequencies greater than or equal to 1 MHz for a duration of at least 150 ⁇ s, these signals being spaced apart one of the other of a delay 6 between 200 and 600 ⁇ s.
  • This phasing of the signals is represented on the curve 2 where we see the first candle supply signal 4 emitted during a first step 4 followed by a delay without signal 6, itself immediately followed by a second signal 5 as emitted during the second step 5.
  • curve A represents the spark temperature when the spark plug 3 is fed with only a first signal 4; and - the curve B represents the spark temperature when the spark plug 3 is fed via the second signal 5 subsequent to the first signal 6 and within a given signal spacing interval 6.
  • the signal spacing delay must be adjusted during the development of the system according to the operating characteristics of the heat engine in order to adapt the nature of the spark produced to the conditions prevailing in the chamber which makes it possible to optimize the ignition conditions.
  • the spacing time 6 between the first and second signals is chosen to be greater than at least once the duration of the first signal (i.e. the duration of the first step 4), in this case this spacing time 6 and here of 1500 ⁇ s is 3.3 times greater than the duration of the first signal 4 (that is to say 150 ⁇ s).
  • the horizontal dotted line in FIG. 1 represents a minimum temperature threshold necessary for the ignition. In order for the mixture to ignite, this mixture must be heated by the spark at a temperature above the ignition temperature threshold.
  • the possible ignition zone is of a maximum length "a" much smaller than the length "b" defining the possible area of ignition when the candle is powered with the second signal after the first.
  • the ignition zone during the second signal is much greater than the ignition zone during the first signal, which makes it possible to accelerate the flame propagation speed in the chamber and to reduce unburnt and misfires.
  • the mixture ignition zone 8 (8" representing the inflamed mixture volume) in the combustion chamber 2 is more extensive using the method according to the invention, with two successive high frequency spark plug power signals spaced apart from each other by a given minimum delay (Fig. 5b) as the area of ignition resulting from a single signal (Fig. 5a).
  • first or second signal emitted during the first or second step 4, 5 has an alternating voltage U of candle tip (of frequency F) whose amplitude increases starting from the beginning of the supply step of candle up reach a maximum voltage.
  • This first portion X of voltage amplitude increase U corresponds to the spark filament forming portion.
  • this second part Y of the signal corresponds to the period of temperature rise of the filaments of the spark.
  • the signal is emitted over a duration D which corresponds to the duration of the candle feeding step 3.
  • these signal parameters U, F and D of each of the first and / or second signals can be predetermined depending on engine operating parameters such as the pressure P and / or the temperature T in the chamber 2 and / or the richness of the ignited mixture 8.

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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)

Abstract

The invention relates to a method of igniting a mixture of oxidant and fuel (1) in a combustion chamber (2) of a combustion engine using a spark plug (3) arranged so that it protrudes into the combustion chamber of the engine (3), said method including a first step of powering the spark plug using a first alternating electrical signal of a frequency higher than 1 MHz (4). The method also includes a second step of powering the spark plug using a second alternating electrical signal of a frequency higher than 1 MHz (5), said second step taking place after the first step and following a time delay (6).

Description

PROCEDE D'ALLUMAGE D'UN MELANGE DE COMBURANT POUR MOTEUR METHOD FOR IGNITING A FUEL MIXTURE FOR A MOTOR
THERMIQUETHERMAL
La présente invention concerne, de façon générale, un procédé d'allumage pour moteur thermique.The present invention relates, in general, to an ignition process for a heat engine.
Il est connu dans le domaine des procédés d'allumage pour moteur thermique des procédés utilisant des bougies d'allumage conventionnelle que l'on retrouve par exemple dans les documents brevets US 6, 085, 733 ou US 2002/0144672. De telles bougies conventionnelles permettent de générer une étincelle linéaire s 'étendant entre des électrodes de la bougie .It is known in the field of thermal engine ignition processes processes using conventional spark plugs found in, for example, US Patent Nos. 6, 085, 733 or US 2002/0144672. Such conventional candles make it possible to generate a linear spark extending between electrodes of the candle.
Pour répondre aux problèmes de défauts d'allumages engendrés par des bougies conventionnelles qui ne peuvent générer que des étincelles linéaires il a été proposé, des bougies d'allumage radiofréquence adaptées à générer une étincelle ramifiée depuis la pointe d'une électrode. Contrairement aux bougies traditionnelles qui ne permettent que de générer des étincelles linéaires, des telles bougies d'allumage radiofréquence sont adaptées, en particulier par la forme et la disposition de leurs électrodes, à générer une étincelle ramifiée lorsque cette électrode est alimentée à l'aide d'un signal électrique alternatif de fréquence supérieure 1 MHz . Une étincelle ramifiée produite à l'aide d'une bougie radiofréquence a plus de chances d'enflammer un mélange de comburant et de carburant qu'une étincelle linéaire d'une bougie conventionnelle, puisque l'étincelle ramifiée s'étend dans une zone de volume supérieur à la zone dans laquelle s'étend l'étincelle linéaire produite par une bougie conventionnelle .In order to respond to the problems of ignition failures caused by conventional spark plugs which can only generate linear sparks, it has been proposed that radio frequency spark plugs adapted to generate a branched spark from the tip of an electrode. Unlike traditional candles that only allow to generate linear sparks, such radiofrequency spark plugs are adapted, in particular by the shape and arrangement of their electrodes, to generate a branched spark when this electrode is powered using an alternating electric signal of higher frequency 1 MHz. A branched spark produced by a radiofrequency candle is more likely to ignite a mixture of oxidant and fuel than a linear spark from a conventional candle, since the branched spark extends into a zone of volume greater than the area in which extends the linear spark produced by a conventional candle.
L'invention concerne donc plus particulièrement, un procédé d'allumage d'un mélange de comburant et de carburant dans une chambre de combustion d'un moteur thermique à l'aide d'une bougie d'allumage radiofréquence générant une étincelle ramifiée depuis la pointe d'une électrode, la bougie étant disposée de manière à déboucher dans ladite chambre de combustion du moteur, le procédé comprenant une première étape d'alimentation de ladite bougie à l'aide d'un premier signal électrique alternatif de fréquence supérieure 1 MHz.The invention therefore relates more particularly to a method for igniting a mixture of oxidant and fuel in a combustion chamber of a combustion engine using a radiofrequency spark plug generating a branched spark from the tip of an electrode, the spark plug being arranged to open into said combustion chamber of the engine, the method comprising a first step of feeding said spark plug to the using a first AC signal of higher frequency 1 MHz.
Le document FR2913297 propose un procédé d'allumage à l'aide d'une bougie d'allumage radiofréquence dans lequel on commande un résonateur pendant l'allumage par l'intermédiaire d'un signal de commande sous forme d'une pluralité de trains d'impulsions, chaque train ayant une durée très faible, par exemple de 5 à lOμs. Cette commande consiste à réaliser des multi-allumages .The document FR2913297 proposes a method of ignition using a radiofrequency ignition plug in which a resonator is controlled during ignition by means of a control signal in the form of a plurality of transmission trains. pulses, each train having a very short duration, for example from 5 to 10μs. This command consists in making multi-ignitions.
Pour la compréhension de l'invention ci-après décrite, le terme « alimentation de la bougie » consiste en l'alimentation de l'électrode de la bougie dotée d'une pointe à l'aide d'un signal électrique alternatif de fréquence supérieure à lMhz, en l'occurrence il s'agit d'une alimentation de l'électrode pointue par des signaux alternatifs ci-après nommés les premier et second signaux électriques alternatifs.For the understanding of the invention described below, the term "supply of the candle" consists of feeding the electrode of the candle with a tip using a higher frequency alternating electric signal. at lMhz, in this case it is a supply of the pointed electrode by alternative signals hereinafter called the first and second alternative electrical signals.
Ce type de procédé d'allumage réalisé en alimentant au moins une bougie à l'aide d'un signal électrique alternatif de fréquence supérieure à IMHz est connu sous le nom de procédé d'allumage radiofréquence .This type of ignition process performed by supplying at least one spark plug with an AC electrical signal with a frequency greater than 1 MHz is known as a radiofrequency ignition process.
Un but recherché par la présente invention est d'améliorer le volume de mélange enflammé et aussi de réduire les inflammations de mélange ratées malgré l'alimentation électrique de la bougie. A cette fin, le procédé d'allumage de l'invention, par ailleurs conforme à la définition générique qu'en donne le préambule défini précédemment, est essentiellement caractérisé en ce que qu'il comprend une seconde étape d'alimentation de ladite bougie à l'aide d'un second signal électrique alternatif de fréquence supérieure 1 MHz, cette seconde étape étant postérieure à la première étape et étant espacée dans le temps par rapport à la première étape d'un délai d'espacement. L'étincelle produite par la bougie lorsqu'elle est alimentée avec un signal électrique de fréquence supérieure à 1 MHz a une forme qui se ramifie dans le mélange et comporte généralement plusieurs branches. L'étincelle comporte plusieurs portions dont le diamètre va en décroissant en allant de l'origine de l'étincelle (c'est-à-dire à l'endroit où se déclenche l'étincelle) vers ses extrémités (l'endroit où l'étincelle cesse de s'étendre) . Il a été remarqué que la température de l'étincelle varie le long de l'étincelle et décroit avec le diamètre des portions d'étincelles. La flamme dans le mélange est initiée aux endroits les plus chauds du mélange, c'est-à-dire au niveau des portions d'étincelle qui ont les diamètres les plus importants. Il a également été constaté que lorsque deux étincelles sont déclenchées consécutivement et préalablement à l'inflammation du mélange, la seconde étincelle se produit sensiblement au même endroit que la première étincelle tout en ayant moins de ramifications. Ainsi, le mélange est préchauffé au voisinage des étincelles produites grâce à la première étape, puis grâce à la seconde étape, produisant des étincelles moins ramifiées, l'élévation de température se poursuit au delà de la température obtenue grâce à la première étape et cela jusqu'à initier la combustion. Le volume de mélange où s'initie la combustion provoquée par la seconde étape est donc supérieur au volume de mélange qui serait enflammé via la seule première étape.A goal sought by the present invention is to improve the volume of inflamed mixture and also to reduce misbehaving mixture inflammations despite the power supply of the candle. To this end, the ignition method of the invention, moreover in conformity with the generic definition given in the preamble defined above, is essentially characterized in that it comprises a second step of feeding said spark plug to using a second signal alternating electric frequency higher than 1 MHz, this second step being subsequent to the first step and being spaced in time with respect to the first step of a spacing period. The spark produced by the candle when powered with an electrical signal of frequency greater than 1 MHz has a shape that branches in the mixture and generally has several branches. The spark has several portions whose diameter decreases going from the origin of the spark (that is to say at the point where the spark ignites) towards its ends (the place where the spark ceases to spread). It has been noticed that the temperature of the spark varies along the spark and decreases with the diameter of the spark portions. The flame in the mixture is initiated at the hottest spots of the mixture, i.e. at the spark portions that have the largest diameters. It has also been found that when two sparks are triggered consecutively and prior to ignition of the mixture, the second spark occurs substantially at the same location as the first spark while having fewer branches. Thus, the mixture is preheated in the vicinity of the sparks produced by the first step, then thanks to the second step, producing less branched sparks, the temperature rise continues beyond the temperature obtained by the first step and this to initiate combustion. The mixing volume in which the combustion caused by the second stage is initiated is therefore greater than the volume of mixture which would be ignited via the first step alone.
Ainsi l'inflammation du mélange présent dans la chambre de combustion est initiée par au moins deux signaux distincts de fréquences respectives supérieures à 1 MHz qui génèrent respectivement au moins deux d'étincelles radiofréquence .Thus, the ignition of the mixture present in the combustion chamber is initiated by at least two distinct signals of respective frequencies greater than 1 MHz which generate respectively at least two radiofrequency sparks.
Grâce à l'invention le volume de mélange enflammé est supérieur à ce qu'il serait si l'inflammation n'était initiée que par un seul signal électrique. L'invention permet donc de réduire le nombre de ratés d'allumage et le volume de carburant imbrûlé tout en augmentant la vitesse de propagation de flamme dans la chambre.Thanks to the invention the volume of inflamed mixture is greater than it would be if the ignition was initiated by a single electrical signal. The invention thus makes it possible to reduce the number of ignition misfires and the unburnt fuel volume while increasing the flame propagation speed in the chamber.
On peut également faire en sorte que ledit délai d'espacement entre les première et seconde étapes soit inférieur à 10 fois la durée de la première étape et préférentiellement inférieur à 5 fois la durée de la première étape .It can also be ensured that said spacing time between the first and second steps is less than 10 times the duration of the first step and preferably less than 5 times the duration of the first step.
Cette caractéristique limite le délai entre les deux signaux d'alimentation de la bougie de manière à minimiser le risque de refroidissement du mélange préchauffé par la première étincelle, ce qui est une condition améliorant la taille du volume de mélange enflammé.This feature limits the delay between the two candle power signals so as to minimize the risk of cooling the mixture preheated by the first spark, which is a condition that improves the size of the ignited mixture volume.
On peut également faire en sorte que le délai d'espacement entre les première et seconde étapes soit supérieur à la durée de la première étape.It can also be ensured that the spacing interval between the first and second steps is greater than the duration of the first step.
Il a été remarqué que cette condition de délai minimum entre les deux étapes/étincelles permet de réduire le nombre de ramifications de la seconde étincelle par rapport à la première étincelle. Permettant ainsi un allongement des ramifications et un accroissement du diamètre moyen des ramifications de la seconde étincelle par rapport à la première étincelle. Ce diamètre moyen est calculé sur la longueur d'une branche d'étincelle donnée. On peut également faire en sorte que le délai d'espacement entre les première et seconde étapes soit compris entre 1 et 5 fois la durée de la première étape.It has been noted that this minimum delay condition between the two stages / sparks makes it possible to reduce the number of branches of the second spark relative to the first spark. Allowing for an extension of the branches and an increase in the average diameter of the branches of the second spark relative to the first spark. This average diameter is calculated over the length of a given spark branch. It can also be ensured that the spacing interval between the first and second steps is between 1 and 5 times the duration of the first step.
Avec un tel délai d'espacement des première et seconde étapes, on a remarqué que l'on obtient un volume de mélange enflammé maximum et cela étant vrai pour divers mélanges comburant/carburant plus ou moins riches.With such a spacing interval of the first and second stages, it has been noticed that a volume of maximum ignited mixture and this is true for various mixtures oxidizer / fuel more or less rich.
On peut également faire en sorte que lesdits premier et second signaux aient des fréquences respectives préférentiellement supérieures à 1 MHzIt can also be ensured that said first and second signals have respective frequencies preferably greater than 1 MHz
Avec de tels niveaux de fréquences il est plus aisé d'entretenir une étincelle sur toute la durée de l'alimentation de la bougie permettant ainsi un échauffement optimum du mélange par la première étape d'alimentation puis un allumage d'un volume important de mélange grâce à la seconde étape d'alimentation de la bougie. Dès lors, le front de flammes se propage des filaments de l'étincelle générée par la seconde étape d'alimentation de la bougie en allant vers les parois de la chambre de combustion dans laquelle débouche la bougie.With such frequency levels it is easier to maintain a spark over the entire duration of the supply of the candle allowing an optimum heating of the mixture by the first step of feeding and ignition of a large volume of mixture thanks to the second step of feeding the candle. Therefore, the flame front propagates filaments of the spark generated by the second step of supplying the candle towards the walls of the combustion chamber into which the candle opens.
On peut également faire en sorte que chacun des dits premier et second signaux électriques ait des paramètres propres que sont l'amplitude de tension du signal U, la fréquence du signal électrique alternatif F, la durée totale du signal D, et que l'un au moins des paramètres de l'un au moins des dits premier et second signaux soit déterminé lors d'une étape préalable aux dites première et seconde étapes en fonction de paramètres déterminant la combustion, ces paramètres déterminant la combustion étant mesurés et/ou estimés et comprenant au moins une pression dans la chambre de combustion P, une température T représentative de la température à l'intérieur de la chambre, la richesse du mélange de carburant et de comburant, et un taux de gaz brûlés présent dans le mélange. Le fait de déterminer l'un au moins des paramètres de l'un au moins des premier et second signaux en fonction de caractéristiques de fonctionnement du moteur thermique (pression, température, richesse de carburant) permet d'adapter la nature de l'étincelle produite lors de la première et/ou de la seconde étape en fonction des conditions régnant dans la chambre ce qui permet d'optimiser les conditions d'allumage.It can also be done so that each of said first and second electrical signals has specific parameters such as the voltage amplitude of the signal U, the frequency of the alternating electric signal F, the total duration of the signal D, and that one at least parameters of at least one of said first and second signals are determined during a step prior to said first and second steps as a function of parameters determining the combustion, these parameters determining the combustion being measured and / or estimated and comprising at least one pressure in the combustion chamber P, a temperature T representative of the temperature inside the chamber, the richness of the mixture of fuel and oxidant, and a rate of burnt gases present in the mixture. Determining at least one of the parameters of at least one of the first and second signals as a function of operating characteristics of the engine (pressure, temperature, fuel efficiency) makes it possible to adapt the nature of the spark produced during the first and / or second step depending on the conditions prevailing in the chamber which optimizes the ignition conditions.
On peut également faire en sorte que la durée de la première étape soit comprise entre 150 et 250 μs, que la durée de la seconde étape soit comprise entre 150 et 250 μs et que ledit délai d'espacement entre les première et seconde étapes soit compris entre 250 et 750 με .It is also possible to ensure that the duration of the first step is between 150 and 250 μs, that the duration of the second step is between 150 and 250 μs and that said spacing interval between the first and second stages is included. between 250 and 750 με.
La combinaison de signaux d'alimentation de bougie de fréquences supérieures à IMHz avec des durées des première et seconde étapes d'alimentation comprises entre 150 et 250 μs et un délai d'espacement entre ces étapes compris entre 250 et 750 μs permet d'augmenter de façon surprenante la longueur moyenne des étincelles ramifiées générées lors de la seconde étape d'alimentation, réduisant ainsi de manière significative le nombre de défauts d'allumage.The combination of candle power supply signals of frequencies greater than IMHz with durations of the first and second supply stages of between 150 and 250 μs and a spacing delay between these steps of between 250 and 750 μs makes it possible to increase surprisingly the average length of the branched sparks generated during the second feeding step, thus significantly reducing the number of ignition defects.
Pour la compréhension de l'invention, le premier signal est émis durant toute la première étape et uniquement durant cette première étape. De même le second signal est émis durant toute la seconde étape et uniquement durant cette seconde étape.For the understanding of the invention, the first signal is emitted during the entire first step and only during this first step. Similarly, the second signal is emitted during the entire second step and only during this second step.
Avec ces durées des première et seconde étapes et du délai d'espacement entre les première et seconde étapes, on a constaté que le temps de formation du noyau de front de flamme dans la chambre de combustion est d'environ 2000 μs, ce qui est particulièrement rapide et cela tout en augmentant le taux d'allumages réussi.With these durations of the first and second steps and the spacing interval between the first and second steps, it has been found that the formation time of the flame front core in the combustion chamber is about 2000 μs, which is particularly fast and that while increasing the rate of ignition successful.
L'invention porte également sur un système d'allumage d'un mélange de comburant et de carburant pour moteur thermique comprenant un générateur de courant et au moins une bougie d'allumage reliée au dit générateur, ledit générateur étant adapté à générer un premier signal électrique alternatif de fréquence supérieure 1 MHz et un second signal électrique alternatif de fréquence supérieure 1 MHz. Le système de l'invention est caractérisé en ce que ledit générateur est adapté à espacer dans le temps lesdits premier et second signaux électrique alternatif d'un délai d'espacement et est adapté à la mise en œuvre du procédé selon l'invention.The invention also relates to a system for igniting a mixture of oxidant and fuel for a heat engine comprising a current generator and at least one spark plug connected to said generator, said generator being adapted to generate a first signal alternating current of 1 MHz higher frequency and a second AC electrical signal of greater frequency 1 MHz. The The system of the invention is characterized in that said generator is adapted to space in time said first and second AC electrical signals with a spacing delay and is adapted to the implementation of the method according to the invention.
Les premier et second signaux générés par le générateur de courant sont tels qu'ils permettent la génération, via la bougie ainsi alimentée, d'étincelles espacées entre elles du délai temporel d'espacement prédéterminé. Ainsi le système de l'invention présente les mêmes avantages que ceux décrits en relation avec le procédé de l'invention.The first and second signals generated by the current generator are such that they allow the generation, via the candle thus supplied, of sparks spaced apart from each other by the predetermined spacing time delay. Thus the system of the invention has the same advantages as those described in relation to the method of the invention.
L'invention porte également sur un moteur thermique comprenant une chambre de combustion et le système d'allumage précité.The invention also relates to a combustion engine comprising a combustion chamber and the aforementioned ignition system.
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 une vue d'une pointe de bougie du système selon l'invention et permettant la mise en œuvre du procédé selon l'invention, et des zones respectives « a » et « b » présentant les zones d'inflammation sans le procédé de l'invention (zone « a ») et avec le procédé de l'invention (zone « b ») , la zone « b » étant plus importante que la zone «. a » ; la figure 2 présente une courbe temporelle d'alimentation de la bougie avec en abscisse le temps et en ordonnée l'intensité du signal d'alimentation de la bougie, lesdits premier et second signaux d'alimentation électrique de la bougie ainsi que le délai d'espacement entre ces signaux sont représentés sur cette figure 2, qui décrit donc le phasage de signaux nécessaire pour mettre en œuvre le procédé de l'invention ; - la figure 3 présente le détail d'un des signaux représentés sur la figure 2, ce signal pouvant être le premier ou le second signal car ces signaux sont, dans ce mode particulier de réalisation, identiques entre eux ; - la figure 4a présente une étincelle émise lorsque la bougie reçoit un premier signal d'alimentation de fréquence élevée supérieure à 1 MHz, en l'occurrence ce premier signal est ici de 5 MHz ;Other features and advantages of the invention will emerge clearly from the description which is given below, by way of indication and in no way limiting, with reference to the accompanying drawings, in which: - Figure 1 represents a view of a peak candle system according to the invention and allowing the implementation of the method according to the invention, and respective zones "a" and "b" having the zones of ignition without the method of the invention (zone "a" ) and with the method of the invention (zone "b"), the zone "b" being greater than the zone ". at "; FIG. 2 shows a time curve of supply of the candle with the abscissa and the ordinate the intensity of the supply signal of the candle, said first and second electrical supply signals of the candle as well as the delay of spacing between these signals are shown in this Figure 2, which therefore describes the signal phasing required to implement the method of the invention; FIG. 3 shows the detail of one of the signals represented in FIG. 2, this signal possibly being the first or the second signal because these signals are, in this particular embodiment, identical to each other; FIG. 4a shows a spark emitted when the spark plug receives a first high frequency power supply signal greater than 1 MHz, in this case this first signal is here 5 MHz;
- la figure 4b présente une étincelle émise lorsque la bougie reçoit un second signal d'alimentation de fréquence élevée supérieure à 1 MHz, en l'occurrence ce second signal est ici de 5 MHz, cette étincelle de la figure 4b est moins ramifiée que celle de la figure 4a et à une amplitude et une largeur de branche d'étincelle supérieures à ce qu'elles sont sur la figure 4a ;FIG. 4b shows a spark emitted when the spark plug receives a second high frequency power supply signal greater than 1 MHz, in this case this second signal is here 5 MHz, this spark of FIG. 4b is less branched than that of FIG. of Figure 4a and an amplitude and a width of spark branch greater than they are in Figure 4a;
- la figure 5a représente la zone de flamme initiée par une seule étincelle radiofréquence RF comme c'est le cas dans l'art antérieur (Figure Aa) ;FIG. 5a represents the flame zone initiated by a single RF radiofrequency spark as is the case in the prior art (FIG. Aa);
- la figure 5b représente la zone de flamme initiée avec le procédé selon l'invention qui génère deux étincelles radiofréquence RF consécutives (Figure 4b) et espacées entre elles dans le temps, on constate que cette zone de flamme de la figure 5b est largement plus étendue que celle de la figure 5a. Comme annoncé précédemment, l'invention concerne un procédé d'allumage d'un mélange de comburant et de carburant dans une chambre de combustion à l'aide d'une bougie ainsi que le système d'allumage 10 permettant la mise en œuvre du procédé selon l'invention et un moteur incluant ce système. La figure 1 représente une bougie d'allumage 3 reliée au générateur G qui est adapté à délivrer des premier et second signaux électriques alternatifs 4, 5 de fréquences supérieures ou égales à 1 MHz pendant une durée d'au moins 150μs, ces signaux étant espacés l'un de l'autre d'un délai 6 compris entre 200 et 600 μs . Ce phasage des signaux est représenté sur la courbe 2 où l'on voit le premier signal 4 d'alimentation de bougie 3 émis durant une première étape 4 suivi d'un délai sans signal 6, lui-même immédiatement suivi d'un second signal 5 émis durant la seconde étape 5. Comme on peut le constater sur la figure 1 : - la courbe A représente la température d'étincelle lorsque la bougie 3 est alimentée avec uniquement un premier signal 4 ; et - la courbe B représente la température d'étincelle lorsque la bougie 3 est alimentée via le second signal 5 postérieurement au premier signal 6 et dans un délai d'espacement de signaux 6 donné. Le délai d'espacement de signaux doit être ajusté lors de la mise au point du système en fonction de caractéristiques de fonctionnement du moteur thermique afin d'adapter la nature de l'étincelle produite aux conditions régnant dans la chambre ce qui permet d'optimiser les conditions d'allumage.FIG. 5b represents the flame zone initiated with the method according to the invention which generates two consecutive RF radiofrequency sparks (FIG. 4b) and spaced apart with respect to time, it can be seen that this flame zone of FIG. extent than that of Figure 5a. As previously announced, the invention relates to a method for igniting a mixture of oxidant and fuel in a combustion chamber using a spark plug and the ignition system 10 for carrying out the method according to the invention and a motor including this system. FIG. 1 represents a spark plug 3 connected to the generator G which is adapted to deliver first and second AC electrical signals 4, 5 of frequencies greater than or equal to 1 MHz for a duration of at least 150 μs, these signals being spaced apart one of the other of a delay 6 between 200 and 600 μs. This phasing of the signals is represented on the curve 2 where we see the first candle supply signal 4 emitted during a first step 4 followed by a delay without signal 6, itself immediately followed by a second signal 5 as emitted during the second step 5. As can be seen in FIG. 1: curve A represents the spark temperature when the spark plug 3 is fed with only a first signal 4; and - the curve B represents the spark temperature when the spark plug 3 is fed via the second signal 5 subsequent to the first signal 6 and within a given signal spacing interval 6. The signal spacing delay must be adjusted during the development of the system according to the operating characteristics of the heat engine in order to adapt the nature of the spark produced to the conditions prevailing in the chamber which makes it possible to optimize the ignition conditions.
La durée d'espacement 6 entre les premier et second signaux est choisie pour être supérieure à au moins une fois la durée du premier signal (c'est-à-dire la durée de la première étape 4), en l'occurrence, cette durée d'espacement 6 et ici de 1500 μs soit 3.3 fois supérieur à la durée du premier signal 4 (c'est-à-dire 150 μs) . La ligne horizontale en pointillés de la figure 1 représente un seuil de température minimum nécessaire à l'inflammation. Pour que le mélange s'enflamme, il faut donc que ce mélange se trouve chauffé par l'étincelle à une température supérieure au seuil de température d'inflammation.The spacing time 6 between the first and second signals is chosen to be greater than at least once the duration of the first signal (i.e. the duration of the first step 4), in this case this spacing time 6 and here of 1500 μs is 3.3 times greater than the duration of the first signal 4 (that is to say 150 μs). The horizontal dotted line in FIG. 1 represents a minimum temperature threshold necessary for the ignition. In order for the mixture to ignite, this mixture must be heated by the spark at a temperature above the ignition temperature threshold.
Ainsi, dans le cas où la bougie est alimentée via le premier signal, la zone d'inflammation possible est d'une longueur maximale « a » largement plus faible que la longueur « b » définissant la zone d'inflammation possible lorsque la bougie est alimentée avec le second signal postérieur au premier .Thus, in the case where the candle is fed via the first signal, the possible ignition zone is of a maximum length "a" much smaller than the length "b" defining the possible area of ignition when the candle is powered with the second signal after the first.
Ainsi la zone d'inflammation durant le second signal est largement supérieure à la zone d'inflammation durant le premier signal, ce qui permet d'accélérer la vitesse de propagation de flamme dans la chambre et réduire les imbrûlés et ratés d'allumage.Thus, the ignition zone during the second signal is much greater than the ignition zone during the first signal, which makes it possible to accelerate the flame propagation speed in the chamber and to reduce unburnt and misfires.
Cette augmentation de la zone potentielle d'inflammation résulte : - du fait que l'étincelle 9 de la seconde étape 5This increase in the potential zone of ignition results from: the fact that the spark 9 of the second step 5
(visible sur la figure 4b déclenchée 500 μs après celle de la figure 4a générée lors de la première étape) est plus longue et moins ramifiée que l'étincelle 7 de la première étape 4 ; et - du fait que l'étincelle 9 de la seconde étape 5 (figure 4b) a un diamètre moyen de branche supérieur au diamètre moyen de branche de l'étincelle 7 de la première étape 4 (figure 4a) ; et(Visible in Figure 4b triggered 500 μs after that of Figure 4a generated in the first step) is longer and less branched than the spark 7 of the first step 4; and because the spark 9 of the second step 5 (FIG. 4b) has a branch average diameter greater than the average branch diameter of the spark 7 of the first step 4 (FIG. 4a); and
- du fait que la température T dans la zone d'étincelle de la seconde étape 5 est supérieure à la température T dans la zone d'étincelle de la première étape 4.since the temperature T in the spark zone of the second step 5 is greater than the temperature T in the spark zone of the first step 4.
En conséquence, et comme le confirment les figures 5a et 5b, la zone d'inflammation de mélange 8 (« 8 » représentant le volume de mélange enflammé) dans la chambre de combustion 2 est plus étendue en utilisant le procédé selon l'invention, avec deux signaux d'alimentation de bougie haute fréquence successifs et espacés l'un de l'autre d'un délai minimum donné (figure 5b) que la zone d'inflammation résultant d'un seul signal (figure 5a). Enfin, comme le montre la figure 3 un signal donnéAs a result, and as confirmed by FIGS. 5a and 5b, the mixture ignition zone 8 ("8" representing the inflamed mixture volume) in the combustion chamber 2 is more extensive using the method according to the invention, with two successive high frequency spark plug power signals spaced apart from each other by a given minimum delay (Fig. 5b) as the area of ignition resulting from a single signal (Fig. 5a). Finally, as shown in Figure 3 a given signal
(premier ou second signal émis lors de la première ou seconde étape 4, 5) a une tension alternative U de pointe de bougie (de fréquence F) dont l'amplitude va en augmentant en partant du début de l'étape d'alimentation de bougie jusqu'à atteindre une tension maximale. Cette première partie X d'augmentation d'amplitude de tension U correspond à la partie de formation de filaments d'étincelle. Puis après avoir atteint ce maximum la tension U se réduit jusqu'à se stabiliser à un seuil donné, cette seconde partie Y du signal correspond à la période de montée en température des filaments de l'étincelle. Le signal est émis sur une durée D qui correspond à la durée de l'étape d'alimentation de bougie 3. Pour améliorer le procédé selon l'invention, ces paramètres de signal U, F et D de chacun des premier et/ou second signaux peuvent être prédéterminés en fonction de paramètres de fonctionnement du moteur que sont la pression P et/ou la température T dans la chambre 2 et /ou la richesse du mélange enflammé 8. (first or second signal emitted during the first or second step 4, 5) has an alternating voltage U of candle tip (of frequency F) whose amplitude increases starting from the beginning of the supply step of candle up reach a maximum voltage. This first portion X of voltage amplitude increase U corresponds to the spark filament forming portion. Then, after reaching this maximum the voltage U is reduced until it stabilizes at a given threshold, this second part Y of the signal corresponds to the period of temperature rise of the filaments of the spark. The signal is emitted over a duration D which corresponds to the duration of the candle feeding step 3. To improve the method according to the invention, these signal parameters U, F and D of each of the first and / or second signals can be predetermined depending on engine operating parameters such as the pressure P and / or the temperature T in the chamber 2 and / or the richness of the ignited mixture 8.

Claims

REVENDICATIONS
1) Procédé d'allumage d'un mélange de comburant et de carburant (1) dans une chambre de combustion (2) d'un moteur thermique à l'aide d'une bougie d'allumage (3) radiofréquence générant une étincelle ramifiée depuis la pointe d'une électrode, la bougie étant disposée de manière à déboucher dans ladite chambre de combustion du moteur (2), le procédé comprenant une première étape d'alimentation de ladite bougie à l'aide d'un premier signal électrique alternatif de fréquence supérieure 1 MHz (4), caractérisé en ce qu'il comprend une seconde étape d'alimentation de ladite bougie à l'aide d'un second signal électrique alternatif de fréquence supérieure 1 MHz (5), cette seconde étape étant postérieure à la première étape et espacée dans le temps par rapport à la première étape d'un délai d'espacement (6).1) A method for igniting a mixture of oxidant and fuel (1) in a combustion chamber (2) of a heat engine by means of a radiofrequency spark plug (3) generating a branched spark from the tip of an electrode, the spark plug being arranged to open into said combustion chamber of the engine (2), the method comprising a first step of feeding said spark plug with a first alternating electric signal 1 MHz higher frequency (4), characterized in that it comprises a second step of supplying said spark plug with a second AC signal of higher frequency 1 MHz (5), this second step being posterior in the first step and spaced in time from the first step of a spacing interval (6).
2) Procédé selon la revendication 1, caractérisé en ce que ledit délai d'espacement (6) entre les première et seconde étapes est inférieur à 10 fois la durée de la première étape et préférentiellement inférieur à 5 fois la durée de la première étape.2) Method according to claim 1, characterized in that said spacing interval (6) between the first and second steps is less than 10 times the duration of the first step and preferably less than 5 times the duration of the first step.
3) Procédé selon l'une au moins des revendications précédentes, caractérisé en ce que le délai d'espacement (6) entre les première et seconde étapes est supérieur à la durée de la première étape.3) Method according to at least one of the preceding claims, characterized in that the spacing time (6) between the first and second steps is greater than the duration of the first step.
4) Procédé selon les revendications 2 et 3, caractérisé en ce que le délai d'espacement (6) entre les première et seconde étapes est compris entre 1 et 5 fois la durée de la première étape. 5) Procédé selon l'une au moins des revendications précédentes, caractérisé en ce que lesdits premier et second signaux (4,5) ont des fréquences respectives préférentiellement supérieures à 1 MHz . 6) Procédé selon l'une au moins des revendications précédentes, caractérisé en ce que chacun des dits premier et second signaux électriques (4, 5) a des paramètres propres que sont l'amplitude de tension du signal (U), la fréquence du signal électrique alternatif (F) , la durée totale du signal (D), et en ce que l'un au moins des paramètres de l'un au moins des dits premier et second signaux (4, 5) est déterminé lors d'une étape préalable aux dites première et seconde étapes en fonction de paramètres déterminant la combustion, ces paramètres déterminant la combustion étant mesurés et/ou estimés et comprenant au moins une pression dans la chambre de combustion (P) , une température (T) représentative de la température à l'intérieur de la chambre (2), la richesse du mélange de carburant et de comburant, et un taux de gaz brûlés présent dans le mélange.4) Method according to claims 2 and 3, characterized in that the spacing interval (6) between the first and second steps is between 1 and 5 times the duration of the first step. 5) Method according to at least one of the preceding claims, characterized in that said first and second signals (4,5) have respective frequencies preferably greater than 1 MHz. 6) Method according to at least one of the preceding claims, characterized in that each of said first and second electrical signals (4, 5) has specific parameters such as the voltage amplitude of the signal (U), the frequency of the alternating electric signal (F), the total duration of the signal (D), and that at least one of the parameters of at least one of said first and second signals (4, 5) is determined during a a step prior to said first and second steps as a function of parameters determining the combustion, these parameters determining the combustion being measured and / or estimated and comprising at least one pressure in the combustion chamber (P), a temperature (T) representative of the temperature inside the chamber (2), the richness of the mixture of fuel and oxidizer, and a rate of flue gas present in the mixture.
7) Procédé selon l'une au moins des revendications précédentes, caractérisé en ce que la durée de la première étape est comprise entre 150 et 250 us et en ce que la durée de la seconde étape est comprise entre 150 et 250 μs et en ce que ledit délai d'espacement entre les première et seconde étapes est compris entre 250 et 750 μs .7) Method according to at least one of the preceding claims, characterized in that the duration of the first step is between 150 and 250 us and in that the duration of the second step is between 150 and 250 μs and in that said spacing interval between the first and second steps is between 250 and 750 μs.
8) Système d'allumage (10) d'un mélange de comburant et de carburant pour moteur thermique comprenant un générateur de courant (G) et au moins une bougie d'allumage (3) reliée au dit générateur (G), ledit générateur (G) étant adapté à générer un premier signal électrique alternatif de fréquence supérieure 1 MHz (4) et un second signal électrique alternatif de fréquence supérieure 1 MHz (5), caractérisé en ce que ledit générateur (G) est adapté à espacer dans le temps lesdits premier et second signaux électrique alternatif (4, 5) d'un délai d'espacement et est adapté à la mise en œuvre du procédé selon l'une au moins des revendications 1 à 7. 9) Moteur thermique comprenant une chambre de combustion et le système d'allumage (10) selon la revendication 8. 8) Ignition system (10) of a mixture of oxidant and fuel for a heat engine comprising a current generator (G) and at least one spark plug (3) connected to said generator (G), said generator (G) being adapted to generate a first 1 MHz higher frequency AC electrical signal (4) and a second 1 MHz higher frequency AC electrical signal (5), characterized in that said generator (G) is adapted to space in the time said first and second electrical signals alternating (4, 5) with a spacing delay and is adapted to the implementation of the method according to at least one of claims 1 to 7. 9) A combustion engine comprising a combustion chamber and the ignition system (10) according to claim 8.
EP10715975.8A 2009-03-24 2010-03-24 Method for igniting a combustible mixture for a combustion engine Not-in-force EP2411659B1 (en)

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FR0951854A FR2943739B1 (en) 2009-03-24 2009-03-24 METHOD FOR IGNITING A FUEL MIXTURE FOR A HEAT ENGINE
PCT/FR2010/050535 WO2010109137A1 (en) 2009-03-24 2010-03-24 Method for igniting a combustible mixture for a combustion engine

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EP2411659B1 (en) 2017-08-02
JP5628283B2 (en) 2014-11-19
US8550059B2 (en) 2013-10-08
CN102362066A (en) 2012-02-22
KR20120020102A (en) 2012-03-07
US20120048225A1 (en) 2012-03-01
FR2943739A1 (en) 2010-10-01
RU2549874C2 (en) 2015-05-10
RU2011142729A (en) 2013-04-27
JP2012521517A (en) 2012-09-13
WO2010109137A1 (en) 2010-09-30
MX2011009982A (en) 2011-12-08
CN102362066B (en) 2015-08-05
FR2943739B1 (en) 2015-09-04

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