EP2250366B1 - Optimisation de la frequence d'excitation d'une bougie radiofrequence - Google Patents

Optimisation de la frequence d'excitation d'une bougie radiofrequence Download PDF

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Publication number
EP2250366B1
EP2250366B1 EP09720587.6A EP09720587A EP2250366B1 EP 2250366 B1 EP2250366 B1 EP 2250366B1 EP 09720587 A EP09720587 A EP 09720587A EP 2250366 B1 EP2250366 B1 EP 2250366B1
Authority
EP
European Patent Office
Prior art keywords
frequency
resonator
spark
value
power supply
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.)
Not-in-force
Application number
EP09720587.6A
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German (de)
English (en)
French (fr)
Other versions
EP2250366A1 (fr
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
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Renault SAS
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Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP2250366A1 publication Critical patent/EP2250366A1/fr
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Publication of EP2250366B1 publication Critical patent/EP2250366B1/fr
Not-in-force legal-status Critical Current
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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
    • 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
    • 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

Definitions

  • the present invention generally relates to radiofrequency plasma spark plugs, intended to equip the combustion chambers of an internal combustion engine, for application to automotive ignition.
  • the invention relates more particularly to the operation of the radiofrequency high-voltage power supply of such a spark plug, based on the resonance phenomenon in an RLC circuit, the resonance frequency of which is determined by intrinsic parameter values of the spark plug.
  • the figure 1 illustrates a plasma generating device according to the invention.
  • This device is provided with a plasma generation resonator 30, representing a first subsystem of the radiofrequency plug, and comprising in series a resistor R 0 , an inductance L 0 and a capacitance C 0 , the values of which are fixed during the embodiment by the geometry and the nature of the materials used, so that the resonator has a resonance frequency greater than 1 MHz.
  • the device is also provided with a radiofrequency power supply module 20, applying an excitation signal U in the form of a voltage at a reference frequency Fc on an output interface to which the plasma generation resonator 30 is connected.
  • a control module 10 supplies the reference frequency Fc to the supply module 20.
  • the excitation of a radiofrequency candle is not stationary, as shown in FIG. figure 2 .
  • the module of command sends a plasma generation command (ignition command) to the power supply module, adapted to trigger the excitation of the resonator.
  • the excitation frequency is then close to the resonance frequency of the resonator.
  • the voltage at the output of the resonator becomes high enough for a spark to form.
  • the formation of the spark at the output of the resonator, occurring substantially at time t_d of the plasma generation control, represents a second subsystem 40 of the radiofrequency candle, the parameters of which modify the resonance conditions of the system as a whole.
  • a spark in a gas like any electric conductor, is characterized by a capacitance C d , modeled on the figure 1 at the output of the radiofrequency resonator 30.
  • R 0 , L 0 and C 0 specific to the resonator, which determine the resonant frequency of the system, this is no longer the case during the formation of a spark, the specific characteristics of the latter indeed changing this resonant frequency.
  • the resonance frequency which is specific to the sparkless resonator with a quality coefficient greater than 100
  • the resonant frequency of the system decreases by several tens of kHz taking into account the additional capacity linked to the presence of the spark at the exit of the resonator, which is sufficient to cause a drop in the quality coefficient of the order of 25% and therefore a significant decrease in the efficiency of the radiofrequency candle.
  • this application to automotive ignition requires the use of resonators with a high quality factor, whose excitation frequency is always close to the resonance frequency of the entire system.
  • the reception of this request is made during a phase of optimizing the excitation frequency of the resonator during which the radiofrequency power supply is configured to apply on its output interface a voltage at a set frequency, which is unfit. to allow the generation of plasma of the resonator.
  • the radiofrequency power supply is configured to apply on its output interface a voltage at a set frequency, which is unfit. to allow the generation of plasma of the resonator.
  • such a system allows to perfectly preset the power supply to the resonance frequency specific to the spark-free spark plug, but on the other hand, does not allow to take into account the triggering of the spark, which, as we saw , modifies the resonance conditions to the detriment of the efficiency of the candle.
  • This solution therefore involves modifying the voltage at the output of the resonator. Indeed, when receiving a request for determining an optimum excitation frequency, the power supply module applies on the output interface a voltage that does not allow the resonator to generate a plasma. Then, once this optimal frequency is determined, the power module applies on its output interface a voltage at this optimum frequency, during an operating phase of the plasma generating device, during which a plasma must be generated. Also, this embodiment requires the implantation of a probe HT at the output of the resonator, which poses a serious technical problem in the case of a car candle.
  • the invention aims to solve one or more of these disadvantages.
  • the invention thus proposes a radiofrequency plasma generation device, comprising a power supply module applying on an output interface an excitation signal at a reference frequency, adapted to allow the formation of a spark at the output of a resonator.
  • plasma generator connected to the output interface of the power supply module, and a control module supplying the reference frequency to the power supply module during a radio frequency plasma generation control, said device being characterized in that that the control module comprises means for determining an optimum excitation frequency, suitable for adapting the reference frequency to the resonance conditions of the device after formation of the spark.
  • the resonance frequency of the sparkless resonator is greater than 1 MHz and the difference between said fixed value and the resonance frequency of the sparkless resonator is in a range between 0 and 100 kHz.
  • the determination means are adapted to set the reference frequency to a value lower than the resonance frequency of the sparkless resonator.
  • the determination means are adapted to modulate the reference frequency during the duration of the plasma generation control.
  • the determination means are adapted to successively set the reference frequency to a first value of the order of magnitude of the resonance frequency of the sparkless resonator, at the moment of the triggering of the plasma generation control and to a second value decreased by a predetermined frequency step with respect to said first value, substantially at the moment of spark formation.
  • the determination means are adapted to control a decrease in the reference frequency from a first fixed value, according to a frequency step adjustable in real time, from the moment of the formation of the spark.
  • the first fixed value is of the order of magnitude of the resonance frequency of the sparkless resonator.
  • the device comprises an electrical measurement module of the supply of the resonator connected to the control module, the means of determination determining the value of the frequency step according to received electrical measurements.
  • the electrical measurement module of the resonator supply is adapted to measure the relative amplitude of the current at the input of the resonator.
  • the invention also relates to an ignition system of an internal combustion engine, characterized in that it comprises at least one plasma generating device as just described.
  • the invention proposes to adapt in real time the frequency of the excitation signal supplied by the power supply module to the radiofrequency resonator during a plasma generation control, in order to maintain the maximum quality factor of the resonator, including after the triggering the spark.
  • control module of the plasma generating device integrates means for determining an optimum excitation frequency, adapted to adapt the reference frequency Fc the resonance conditions of the device after formation of the spark.
  • the reference frequency is set to a value lower than the resonance frequency of the sparkless resonator.
  • the radiofrequency supply module of the resonator is set beforehand at a frequency lower than the resonance frequency of the sparkless resonator in order to excite the resonator. Knowing that during the formation of the spark, the natural frequency of the device as a whole typically decreases by several tens of kHz, the control module fixes for example the reference frequency to a value in a range between 0 and 100 kHz below the resonance frequency specific to the spark-free resonator.
  • the device is naturally in optimal operating conditions taking into account the formation of the spark and the quality factor reaches its maximum.
  • another embodiment is not to set once and for all the set frequency before sending the plasma generation command to a value optimized to take into account the resonance conditions after formation of the spark as it has just been seen, but on the contrary, to modulate the reference frequency during the duration of the control of plasma generation.
  • the means for determining the control module are adapted to successively set the reference frequency Fc to a first value of the order of magnitude of the resonance frequency of the spark-free resonator, at the moment t_0 of the triggering of the control of plasma generation, and at a second value decreased by the predetermined frequency step with respect to this first value, substantially at time t_d of the formation of the spark.
  • the reference frequency of a value of 50 kHz is reduced with respect to an initial value corresponding to the value of the resonance frequency of the sparkless resonator, at the instant t_d of the plasma generation control.
  • a variant provides for optimizing in real time the adaptation of the excitation frequency during the plasma generation control, taking into account the random variation of the parameters of the real spark. More precisely, the means for determining the control module are then adapted to control the decrease of the reference frequency at the time of the formation of the spark, according to a frequency step that is not previously fixed, but on the contrary adjustable in real time. depending on the parameters of the actual spark.
  • the device according to the invention comprises, with reference to the figure 3 , a module 50 for electrical measurement of the supply of the resonator, connected to the control module 10.
  • the control module detects an electrical measurement representative of the formation of the spark (via a reception interface not shown) and determines then an optimal excitation frequency according to these electrical measurements, adapted to the current resonance conditions with a spark formed.
  • the electrical measurements make it possible, for example, to determine the adjustable frequency step of which it is necessary to reduce the reference frequency used as the frequency of control for the power supply module to optimize in real time the resonant system as a whole.
  • the electrical measurement module of the resonator supply is for example adapted to measure the relative amplitude of the current at the input of the resonator.
  • the amplitude of the current at the input of the resonator is checked and compared with the amplitude of the preceding alternation. If, at the end of the transient phase t_d where the spark is formed, there is a drop in the current (due to the formation of the spark), then the set frequency supplied to the power supply module of a no frequency determined in real time according to the measured current drop, so that the radio frequency supply of the resonator adapts in real time to the current resonant conditions of the device as a whole.
  • the device according to the invention therefore makes it possible to maintain the maximum quality factor of the radiofrequency candle, whatever the operating regime of its operation.
  • the proposed solution is easy to implement, inexpensive and allows to control the supplies of radio frequency candles in real time and cylinder by cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Plasma Technology (AREA)
EP09720587.6A 2008-02-28 2009-02-19 Optimisation de la frequence d'excitation d'une bougie radiofrequence Not-in-force EP2250366B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0851276A FR2928240B1 (fr) 2008-02-28 2008-02-28 Optimisation de la frequence d'excitation d'une bougie radiofrequence.
PCT/FR2009/050264 WO2009112731A1 (fr) 2008-02-28 2009-02-19 Optimisation de la frequence d'excitation d'une bougie radiofrequence

Publications (2)

Publication Number Publication Date
EP2250366A1 EP2250366A1 (fr) 2010-11-17
EP2250366B1 true EP2250366B1 (fr) 2013-07-10

Family

ID=39855029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09720587.6A Not-in-force EP2250366B1 (fr) 2008-02-28 2009-02-19 Optimisation de la frequence d'excitation d'une bougie radiofrequence

Country Status (10)

Country Link
US (1) US8656880B2 (zh)
EP (1) EP2250366B1 (zh)
JP (1) JP2011513625A (zh)
KR (1) KR101580223B1 (zh)
CN (1) CN101981305B (zh)
BR (1) BRPI0907782A2 (zh)
FR (1) FR2928240B1 (zh)
MX (1) MX2010009442A (zh)
RU (1) RU2516295C2 (zh)
WO (1) WO2009112731A1 (zh)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2934942B1 (fr) * 2008-08-05 2010-09-10 Renault Sas Controle de la frequence d'excitation d'une bougie radiofrequence.
WO2012097205A2 (en) * 2011-01-13 2012-07-19 Federal-Mogul Ignition Company Corona ignition system having selective enhanced arc formation
JP5658729B2 (ja) * 2012-11-29 2015-01-28 日本特殊陶業株式会社 点火システム
US20140218005A1 (en) * 2013-02-06 2014-08-07 General Electric Company Anode depletion sensor hardware circuit
DE102013111062B4 (de) * 2013-10-07 2017-03-16 Borgwarner Ludwigsburg Gmbh Verfahren zum Einstellen einer Anregungsfrequenz eines Schwingkreises einer Koronazündeinrichtung
AU2015338676B2 (en) * 2014-10-30 2020-08-27 North-West University Ignition system for an internal combustion engine and a control method thereof
CN105003376B (zh) * 2015-07-20 2017-04-26 英国Sunimex有限公司 一种发动机射频点火控制方法和装置
US10424467B2 (en) * 2017-03-13 2019-09-24 Applied Materials, Inc. Smart RF pulsing tuning using variable frequency generators
JP6723477B2 (ja) * 2017-11-09 2020-07-15 三菱電機株式会社 点火装置
CN109768702B (zh) * 2018-12-27 2020-12-25 金国卫 用于寻找消毒电源谐振电路谐振频率点的模控电路

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JPS61210270A (ja) * 1985-03-15 1986-09-18 Nippon Soken Inc 圧電素子駆動装置
FR2649759B1 (fr) * 1989-07-13 1994-06-10 Siemens Bendix Automotive Elec Dispositif d'allumage pour moteur a combustion interne
RU2094646C1 (ru) * 1994-02-10 1997-10-27 Научно-исследовательский институт машиностроения Главного управления ракетно-космической техники Комитета РФ по оборонным отраслям промышленности Высокочастотная электроразрядная система воспламенения
US5568801A (en) * 1994-05-20 1996-10-29 Ortech Corporation Plasma arc ignition system
US6334302B1 (en) * 1999-06-28 2002-01-01 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Variable specific impulse magnetoplasma rocket engine
AU5496300A (en) * 1999-09-15 2001-04-17 Knite, Inc. Ignition system for stratified fuel mixtures
DE102004058925A1 (de) * 2004-12-07 2006-06-08 Siemens Ag Hochfrequenz-Plasmazündvorrichtung für Verbrennungskraftmaschinen, insbesondere für direkt einspritzende Otto-Motoren
CN1693699A (zh) * 2005-06-16 2005-11-09 王刚毅 提高内燃发动机燃烧效率的微波点火系统
DE102005036968A1 (de) * 2005-08-05 2007-02-15 Siemens Ag Plasma-Zündsystem und Verfahren zu dessen Betrieb
FR2895170B1 (fr) * 2005-12-15 2008-03-07 Renault Sas Optimisation de la frequence d'excitation d'un resonateur
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JP5117202B2 (ja) * 2008-01-24 2013-01-16 本田技研工業株式会社 エンジン
FR2934942B1 (fr) 2008-08-05 2010-09-10 Renault Sas Controle de la frequence d'excitation d'une bougie radiofrequence.

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Publication number Publication date
US8656880B2 (en) 2014-02-25
KR101580223B1 (ko) 2015-12-24
BRPI0907782A2 (pt) 2016-06-07
FR2928240A1 (fr) 2009-09-04
JP2011513625A (ja) 2011-04-28
US20110048355A1 (en) 2011-03-03
FR2928240B1 (fr) 2016-10-28
RU2010139661A (ru) 2012-04-10
MX2010009442A (es) 2010-11-30
KR20110000642A (ko) 2011-01-04
CN101981305B (zh) 2013-03-27
EP2250366A1 (fr) 2010-11-17
CN101981305A (zh) 2011-02-23
WO2009112731A1 (fr) 2009-09-17
RU2516295C2 (ru) 2014-05-20

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