WO2009016310A2 - Moteur a combustion et procede de commande d'un moteur a combustion - Google Patents
Moteur a combustion et procede de commande d'un moteur a combustion Download PDFInfo
- Publication number
- WO2009016310A2 WO2009016310A2 PCT/FR2008/051373 FR2008051373W WO2009016310A2 WO 2009016310 A2 WO2009016310 A2 WO 2009016310A2 FR 2008051373 W FR2008051373 W FR 2008051373W WO 2009016310 A2 WO2009016310 A2 WO 2009016310A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- power
- supply
- combustion engine
- tip
- Prior art date
Links
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
- F02P23/00—Other ignition
- F02P23/04—Other physical ignition means, e.g. using laser rays
- F02P23/045—Other physical ignition means, e.g. using laser rays using electromagnetic microwaves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
- F02D41/3035—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the premixed charge compression-ignition mode
- F02D41/3041—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the premixed charge compression-ignition mode with means for triggering compression ignition, e.g. spark plug
Definitions
- the present invention generally relates to the field of ignition of fuel / oxidant mixture in a combustion chamber of an internal combustion engine.
- the invention relates to an internal combustion engine comprising: - a pulse current generator; at least one electrode having at least one tip;
- a means for controlling the power supply of said electrode by said generator and a combustion chamber in which is positioned the tip of said electrode, this point being remote from the inner wall of the chamber by a minimum distance (D) away.
- the invention also relates to a method of controlling an internal combustion engine comprising:
- a pulsed current generator at least one electrode having at least one tip;
- a means for controlling the power supply of said electrode by said generator and a combustion chamber in which is positioned the tip of said electrode, said tip being remote from the inner wall of the chamber by a minimum distance (D); a piston slidably mounted in the chamber between a top dead center position and a bottom dead center position.
- Combustions inside a combustion chamber are often not phased at the most opportune moments to optimize the operation of an engine. A dispersion of the ignition timing from one cycle to another or from one engine speed to another can adversely affect engine performance and can promote the generation of pollutants or unburnt materials.
- the present invention aims to provide an engine and a method for better control of the moment of ignition of the combustion / fuel mixture in the combustion chamber.
- the engine of the invention which is also in accordance with the generic definition given in the preamble defined above, is essentially characterized in that the current generator and the electrode are adapted so that the power density (R ) generated during the supply of said electrode is less than 10 power 5 watts per cubic centimeter, this power density (R) being equal to the power supply power (Pmax) of said electrode divided by the minimum distance (D) of high distance to the cube.
- control method of the invention which is moreover in conformity with the generic definition given in the preamble defined above, is essentially characterized by admitting a mixture of oxidant and fuel in the chamber of combustion and during the passage of the piston from its bottom dead position to its top dead position, prior to the arrival of the piston at the top dead center, generates a pulsed supply current of said electrode such that the power density generated when powering said electrode is less than 10 power 5 watts per cubic centimeter, this power density being calculated by dividing the power supply power of said electrode by the minimum distance of high distance cube.
- the "minimum distance of distance D" is the smallest distance measurable in a straight line between the tip of the electrode of the candle and the wall of the chamber and without intersection with an element of this candle. This minimum distance is the shortest path between the tip of the spark plug electrode and the ground electrode formed by the chamber wall. If an electric discharge should occur between the tip of this electrode and the chamber wall, the minimum length of the electric arc formed by this discharge would be equal to this minimum distance D.
- the risk of occurrence of an electric discharge is determined by the minimum distance D and the power supply of the electrode or by the power density depending on the power supply and this minimum distance D.
- the spark plug has a single pointed electrode which is electrically insulated from the inner chamber wall.
- this inner wall constitutes a ground electrode.
- the power supply noted by the sequence Pmax is the average power, that is to say the average value of the electrical power delivered to the electrode over a period of time. uninterrupted supply of this electrode.
- the auto ignition of the oxidant / fuel mixture is triggered in a preferred manner at the location of the stratum containing the free radicals and / or the hydrocarbon species produced by the ionization when the pressure and temperature conditions in the room are expected.
- the invention is applied to engines of the HCCI type, that is to say engines whose combustion is not initiated by a spark plug but whose combustion is self initiated when the only pressure conditions , temperature and mixing composition in the chamber are combined.
- the ionization of the mixture by supplying the electrode makes it possible to prepare the auto-inflammation by creating preferred areas of self-ignition, without it being the power supply of the electrode that triggers this inflammation. Indeed, on this type of engine, the auto-ignition can take place while the electrode is no longer powered.
- the power supply of the electrode with a low level of electrical power is also energy efficient compared to a power supply with a high electrical power.
- the power density generated during the supply of said electrode may be less than 10 watts per cubic centimeter.
- This embodiment makes it possible to define a volume power range for which it is certain that no self-ignition can be triggered by the ionization, at the moment of this ionization, the self-ignition occurring only later, once the pressure in the chamber has increased due to the rise of the piston towards the top dead center of the engine.
- the self-ignition is not initiated by the electrode but is initiated by the conditions of pressure and temperature which improves the quality of combustion.
- the power density R generated during the supply of said electrode may be between 10 power and 10 power 4 watts per cubic centimeter.
- This embodiment makes it possible to define a range for which it is certain that no autoignition can be triggered by the ionization alone, and for which it is certain that the level of ionization is sufficient to reduce the autoignition dispersions. in a significative way.
- the pulse current generator prefferably adapted to generate a single-pulse current.
- This embodiment facilitates the development of the motor power supply because only the transmitted power and the discharge rate are to be defined.
- the pulse current generator prefferably be adapted to generate an alternating current.
- This alternative embodiment of the above allows an ionization of the mixture over a longer period than in the single pulse embodiment, which favors the creation of ionized strata of greater volume.
- the pulse current generator is preferably adapted to generate an alternating current of frequency between 1 and 10 Megahertz and preferably between 1 and 5 Megahertz. This choice of frequency appears desirable to improve the quantity of radical species produced.
- This embodiment makes it possible to prevent the ignition being initiated by the electrode, this ignition being triggered on its own as soon as the pressure and temperature conditions in the chamber are reached.
- the pulsed current supply duration of the electrode is between 1 and 20 milliseconds. This time corresponds to the time necessary to generate sufficient free radicals and allow self-ignition repeatable over time. Still according to the method of the invention, it is possible to make sure that the pulsed supply current of the electrode is a single pulse current or is a radio frequency current of frequency between 1 and 5 Megahertz.
- the power density R generated by the generator around the electrode is such that the temperature around the electrode at the time of ionization is less than 800 ° Kelvin and preferably less than 500 ° Kelvin. This feature prevents the power supply of the electrode from being the cause of the inflammation.
- FIG. 1 represents a sectional view of a combustion chamber of an engine according to the invention
- FIG. 2 represents three types of electrodes that may be suitable for the implementation of the invention
- Figure 3 shows two types of power supply currents that may be suitable for supplying the electrode of an engine of the invention
- FIG. 4 shows pressure evolution curves in a combustion chamber of a motor of the prior art, each curve of this figure corresponds to a clean engine cycle, the superposition of these curves on the same graph highlights the dispersion over time of the autoignition moments between the different motor cycles
- FIG. 5 represents a graph similar to that of FIG. 4 but whose measurements of evolution of pressure are performed on an engine according to the invention, this graph highlighting the reduction of the autoignition dispersion.
- the invention relates to an internal combustion engine such as that shown in Figure 1.
- This engine comprises a combustion chamber 1 in which slides a piston movable between a top dead center in which the volume of the chamber is minimum and a bottom dead point in which the volume of the chamber is maximum.
- This motor comprises a single pointed electrode whose tip is disposed inside the chamber at a distance D from the inner wall of the chamber. This distance D is the minimum distance
- the electrode 5 is selectively powered by a pulse current generator 6 as a function of a command generated by a control means 7.
- the metal electrode 5 is pointed and is electrically insulated by a ceramic body of the wall of the combustion chamber 1 also called cylinder head.
- the electrode When supplied by the current generator with a voltage of 20 to 30 kV, the electrode causes the formation of a corona discharge also known by the term "corona" discharge associated or not with a homogeneous discharge known under the term of glow 8 discharge for incandescent discharge.
- This type of discharge occurs when the volumetric power supply electrical power is less than 10 power 5 watts per cubic centimeter. It should be noted that this power density R is equal to the average power supply power Pmax of said electrode 5 divided by the minimum distance D of high distance to the cube.
- This discharge modifies the chemical composition of the gas by partially cracking the gas in a zone limited to a few millimeters, or even 1 or 2 centimeters around the tip of the electrode.
- the feeding of the electrode allowing this partial cracking takes place after the valves 3 and 4 of the engine are closed and shortly before the start of operation. compression or during this compression.
- the energy or power supply of the electrode is chosen by the control means 7 which is a calculator, this power being variable as a function of the engine speed.
- the duration of the power supply is chosen to be between 1 and 20 milliseconds.
- FIGS. 2a, 2b and 2c show three types of electrodes respectively having one, two or four points, each of these electrodes being adapted to form the electrode of the motor according to the invention and to implement the method of the invention . It has been found that it is preferable for an electrode to have no more than four points in order to promote the quality of the discharge.
- the tip (s) of each electrode is (are) provided with a peak radius of curvature of between 10 and 100 ⁇ m.
- Each of these electrodes can be fed in a single pulse manner with an electric current of the type of that of FIG. 3a or with a multi-pulse current with an alternating electric current of frequency 1 and 5 Megahertz. In each case, it is ensured that the power supply is limited, below a level which could generate premature ignition and above a level allowing partial cracking.
- the power supply power of said electrode must be between 10 power 2 and 10 power 4 watts per cubic centimeter and the duration of this power between 1 and 20 ms.
- FIGS. 4 and 5 each show examples of pressure changes in combustion chambers of engine for portions of motor cycles or auto-inflammations occur.
- the pressure in the chamber 1 is recorded as a function of time, this chamber containing a propane / air mixture of richness 0.5.
- the first rise in pressure is due to compression, that is to say the displacement of the piston from its bottom dead center to its top dead center.
- the second pressure rise offset in time with respect to the first corresponds to the self-ignition of the mixture.
- FIG. 4 which shows the operation of a motor of the prior art
- the delay between the beginning of the first rise in pressure (around 100 milliseconds) and the beginning of the second rise in pressure is variable as a function of cycles and a disparity of almost 100 ms can be observed between an early self-ignition cycle and a late self-ignition cycle.
- FIG. 5 which represents the operation of an engine according to the invention and operating according to the method of the invention, it can be seen that the distortion of the ignition delay between different cycles is practically nil. It is thus easier to anticipate the moment of self-ignition from one motor cycle to another by performing partial cracking by supplying the electrode with reduced power prior to self-ignition.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Spark Plugs (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200880105589A CN101796293A (zh) | 2007-07-25 | 2008-07-21 | 内燃发动机及控制内燃发动机的方法 |
BRPI0814068-5A2A BRPI0814068A2 (pt) | 2007-07-25 | 2008-07-21 | Motor de combustão interna, e método para controlar o mesmo |
EP08826725A EP2171259A2 (fr) | 2007-07-25 | 2008-07-21 | Moteur a combustion et procede de commande d'un moteur a combustion |
US12/670,402 US20100212631A1 (en) | 2007-07-25 | 2008-07-21 | Combustion engine and method of controlling a combustion engine |
JP2010517459A JP2010534294A (ja) | 2007-07-25 | 2008-07-21 | 燃焼機関及び燃焼機関の制御方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0705437 | 2007-07-25 | ||
FR0705437A FR2919343B1 (fr) | 2007-07-25 | 2007-07-25 | Moteur a combustion et procede de commande d'un moteur a combustion. |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009016310A2 true WO2009016310A2 (fr) | 2009-02-05 |
WO2009016310A3 WO2009016310A3 (fr) | 2009-04-09 |
Family
ID=39125229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2008/051373 WO2009016310A2 (fr) | 2007-07-25 | 2008-07-21 | Moteur a combustion et procede de commande d'un moteur a combustion |
Country Status (9)
Country | Link |
---|---|
US (1) | US20100212631A1 (fr) |
EP (1) | EP2171259A2 (fr) |
JP (1) | JP2010534294A (fr) |
KR (1) | KR20100057621A (fr) |
CN (1) | CN101796293A (fr) |
BR (1) | BRPI0814068A2 (fr) |
FR (1) | FR2919343B1 (fr) |
RU (1) | RU2010106652A (fr) |
WO (1) | WO2009016310A2 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010066336A1 (fr) * | 2008-12-11 | 2010-06-17 | Bayerische Motoren Werke Aktiengesellschaft | Moteur à combustion interne et procédé pour la combustion à allumage par compression |
US20120145136A1 (en) * | 2010-12-14 | 2012-06-14 | John Antony Burrows | Multi-event corona discharge ignition assembly and method of control and operation |
DE102012110362A1 (de) * | 2012-10-30 | 2014-04-30 | Borgwarner Beru Systems Gmbh | Koronazündeinrichtung und Verfahren zum Herstellen eines Zündkopfes für eine Koronazündeinrichtung |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010045175B4 (de) * | 2010-09-04 | 2014-03-27 | Borgwarner Beru Systems Gmbh | Zünder zum Zünden eines Brennstoff-Luft-Gemisches mittels einer HF-Korona-Entladung und Motor mit solchen Zündern |
JP6237329B2 (ja) | 2014-02-26 | 2017-11-29 | マツダ株式会社 | 直噴ガソリンエンジン |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4138980A (en) * | 1974-08-12 | 1979-02-13 | Ward Michael A V | System for improving combustion in an internal combustion engine |
US4556020A (en) * | 1981-07-06 | 1985-12-03 | General Motors Corporation | Method and means for stimulating combustion especially of lean mixtures in internal combustion engines |
US4820957A (en) * | 1986-02-18 | 1989-04-11 | Aleksandar Zivkovich | Process for burning a carbonaceous fuel using a high energy alternating current wave |
US6232704B1 (en) * | 1998-04-20 | 2001-05-15 | Daimlerchrysler Ag | Spark plug with specific electrode structure |
US20040129241A1 (en) * | 2003-01-06 | 2004-07-08 | Freen Paul Douglas | System and method for generating and sustaining a corona electric discharge for igniting a combustible gaseous mixture |
EP1515408A2 (fr) * | 2003-09-12 | 2005-03-16 | Renault s.a.s. | Bougie de génération de plasma à inductance intégrée |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4287862A (en) * | 1977-10-03 | 1981-09-08 | Nippon Soken, Inc. | Otto-cycle internal combustion engine |
US4515117A (en) * | 1982-09-17 | 1985-05-07 | Yukio Kajino | Method of and apparatus for igniting internal combustion engine |
IT1204274B (it) * | 1986-04-24 | 1989-03-01 | Claudio Filippone | Dispositivo di accensione a controllo elettronico di plasma,per motori a combustione interna |
FR2649759B1 (fr) * | 1989-07-13 | 1994-06-10 | Siemens Bendix Automotive Elec | Dispositif d'allumage pour moteur a combustion interne |
US5239973A (en) * | 1990-10-12 | 1993-08-31 | Mitsubishi Denki Kabushiki Kaisha | Ignition apparatus for an internal combustion engine |
-
2007
- 2007-07-25 FR FR0705437A patent/FR2919343B1/fr not_active Expired - Fee Related
-
2008
- 2008-07-21 BR BRPI0814068-5A2A patent/BRPI0814068A2/pt not_active IP Right Cessation
- 2008-07-21 JP JP2010517459A patent/JP2010534294A/ja not_active Withdrawn
- 2008-07-21 WO PCT/FR2008/051373 patent/WO2009016310A2/fr active Application Filing
- 2008-07-21 EP EP08826725A patent/EP2171259A2/fr not_active Withdrawn
- 2008-07-21 RU RU2010106652/06A patent/RU2010106652A/ru not_active Application Discontinuation
- 2008-07-21 US US12/670,402 patent/US20100212631A1/en not_active Abandoned
- 2008-07-21 CN CN200880105589A patent/CN101796293A/zh active Pending
- 2008-07-21 KR KR1020107004025A patent/KR20100057621A/ko not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4138980A (en) * | 1974-08-12 | 1979-02-13 | Ward Michael A V | System for improving combustion in an internal combustion engine |
US4556020A (en) * | 1981-07-06 | 1985-12-03 | General Motors Corporation | Method and means for stimulating combustion especially of lean mixtures in internal combustion engines |
US4820957A (en) * | 1986-02-18 | 1989-04-11 | Aleksandar Zivkovich | Process for burning a carbonaceous fuel using a high energy alternating current wave |
US6232704B1 (en) * | 1998-04-20 | 2001-05-15 | Daimlerchrysler Ag | Spark plug with specific electrode structure |
US20040129241A1 (en) * | 2003-01-06 | 2004-07-08 | Freen Paul Douglas | System and method for generating and sustaining a corona electric discharge for igniting a combustible gaseous mixture |
EP1515408A2 (fr) * | 2003-09-12 | 2005-03-16 | Renault s.a.s. | Bougie de génération de plasma à inductance intégrée |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010066336A1 (fr) * | 2008-12-11 | 2010-06-17 | Bayerische Motoren Werke Aktiengesellschaft | Moteur à combustion interne et procédé pour la combustion à allumage par compression |
US8347850B2 (en) | 2008-12-11 | 2013-01-08 | Bayerische Motoren Werke Aktiengesellschaft | Internal-combustion engine and homogeneous charge compression ignition process |
US20120145136A1 (en) * | 2010-12-14 | 2012-06-14 | John Antony Burrows | Multi-event corona discharge ignition assembly and method of control and operation |
KR20130140629A (ko) * | 2010-12-14 | 2013-12-24 | 페더럴-모굴 이그니션 컴퍼니 | 멀티이벤트 코로나 방전 점화 어셈블리와 제어 및 동작 방법 |
KR101928326B1 (ko) * | 2010-12-14 | 2018-12-12 | 페더럴-모굴 이그니션 컴퍼니 | 멀티이벤트 코로나 방전 점화 어셈블리와 제어 및 동작 방법 |
DE102012110362A1 (de) * | 2012-10-30 | 2014-04-30 | Borgwarner Beru Systems Gmbh | Koronazündeinrichtung und Verfahren zum Herstellen eines Zündkopfes für eine Koronazündeinrichtung |
DE102012110362B4 (de) * | 2012-10-30 | 2015-10-15 | Borgwarner Ludwigsburg Gmbh | Koronazündeinrichtung und Verfahren zum Herstellen eines Zündkopfes für eine Koronazündeinrichtung |
US9464618B2 (en) | 2012-10-30 | 2016-10-11 | Borgwarner Ludwigsburg Gmbh | Corona ignition device and method for producing an ignition head for a corona ignition device |
Also Published As
Publication number | Publication date |
---|---|
FR2919343A1 (fr) | 2009-01-30 |
BRPI0814068A2 (pt) | 2015-01-06 |
WO2009016310A3 (fr) | 2009-04-09 |
EP2171259A2 (fr) | 2010-04-07 |
RU2010106652A (ru) | 2011-08-27 |
CN101796293A (zh) | 2010-08-04 |
KR20100057621A (ko) | 2010-05-31 |
JP2010534294A (ja) | 2010-11-04 |
FR2919343B1 (fr) | 2013-08-16 |
US20100212631A1 (en) | 2010-08-26 |
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