Classifications

• • 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
  • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
  • F02D41/0047—Controlling exhaust gas recirculation [EGR]
  • F02D41/0065—Specific aspects of external EGR control
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
  • F02M26/38—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in parallel
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M2026/001—Arrangements; Control features; Details
  • F02M2026/006—EGR specially adapted for intake systems having two or more fuel injectors per cylinder
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
  • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
  • F02M26/20—Feeding recirculated exhaust gases directly into the combustion chambers or into the intake runners
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
  • F02M26/39—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in series
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
  • F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
  • F02M26/44—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which a main EGR passage is branched into multiple passages
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/40—Engine management systems

Definitions

• the present invention relates to combustion in internal combustion engines, and more particularly to compression ignition engines of the diesel type, for automotive vehicles.
• the present invention essentially relates to the management of the external recycled exhaust gases (EGR) and to the manner of introducing these gases into the combustion chamber in order to obtain the desired effects, and in particular a stratification of the gases admixed. s in the combustion chamber.
• Patent Application GB-A-2 328 716 FORD
• FORD seeks to obtain a stratification of the EGR gases in the combustion chamber around the axis of the cylinder by introducing these gases by means of a specific duct which brings the EGR gas at the point of the control valve.
• the fresh air intake duct has a pivoting flap that regulates the flow of fresh gases in the intake duct.
• the objective sought in this prior document is essentially to maintain the recycled exhaust gas in the center of the combustion chamber.
• US-A-5918577 discloses a radial stratification system of burnt gases in the combustion chamber of an internal combustion engine by re-suction through the exhaust valves of gases previously removed during the exhaust phase .
• the exhaust gases in question are therefore residual gases, that is to say recycled exhaust gases.
• US-A-6318348 also mentions a radial stratification of the gases admitted into the combustion chamber, the whole of the charge being rotated along the axis of the cylinder and the residual flue gases being maintained preferentially on the circumference of the cylinder. Again, it is a stratification of recycled exhaust gases called "internal”, which are maintained preferentially on the circumference of the cylinder.
• British Patent Application GB-A-2 298 896 uses two intake ducts, one of which is divided into two parts by a partition, so as to be able to introduce through the corresponding intake valve, an air mixture and EGR gas. Radial or vertical stratification is obtained by controlling the flow of the admitted EGR gas.
• French patent application FR-A-2 859765 (RENAULT) describes the use of two intake ducts receiving a mixture of air and EGR gas, each of the ducts being able to be supplied with additional air or additional EGR gas. .
• British Patent Application GB-A-2328980 discloses a branching of an EGR gas bypass duct in the air intake duct in a cylinder and furthermore describes the addition of a device allowing orient the admitted gases by sticking them against the walls of the combustion chamber in order to obtain a radial stratification.
• the residual gases i.e. the internal exhaust gases
• the external recycled exhaust gases so that the problems which arise for the stratification of these gases are different, depending on whether it is residual gas or external gas.
• the object of the present invention is to stratify the external recycled exhaust gases (EGR) around the axis of the cylinder in the combustion chamber of a cylinder. particularly simple and effective way.
• EGR external recycled exhaust gases
• the internal combustion engine for a motor vehicle is of the type comprising several cylinders each provided with at least one intake duct for air and gas.
• the air intake duct comprises an air flow control valve, mounted in the air intake duct upstream of the junction point.
• Control means are able to act on the recycled exhaust gas flow control valve (EGR) and on the air flow control valve so as to admit alternately through the intake duct, or the air is recycled exhaust gas (EGR).
• These control means may for example comprise an electronic control unit installed in the motor vehicle and suitably programmed or include electronic circuits capable of delivering control signals for the control valves.
• the alternative intake of recycled air and exhaust gas enables the combustion chamber in the cylinder to be fed sequentially and thus to obtain a stratification of the recycled exhaust gases in the combustion chamber. around the axis of the cylinder. Indeed, the speed of the admitted gases depends on various factors related to the operation of the engine and in particular the speed and the position of the piston which moves in the cylinder. The different gases being admitted sequentially into the combustion chamber, will have a different speed resulting in stratification of these gases in the combustion chamber.
• means are provided for regulating the speed of the gases admitted into the cylinder.
• These means may comprise, for example, an adjustable flap mounted in the air intake duct downstream of the point of junction.
• the position control of such a flap can be provided by signals generated by the electronic control unit.
• the means for controlling the velocity of the gases admitted to the cylinder may comprise means for controlling the opening movements of intake valves.
• These control means may for example comprise sensors for speed and / or position of the piston. The signals from these sensors can be transmitted to an electronic control unit generating control signals for the intake valves.
• the means for regulating the speed of the gases admitted into the cylinder may comprise different mobile members also used to control the aerodynamics of the gases in the combustion chamber, for example a swirl flap, it is to say a shutter capable of creating a rotational movement of the gases in the combustion chamber around the axis of the cylinder, this movement being called "swirl”.
• each intake duct comprises an air flow control valve, mounted in the air intake duct upstream of the junction point.
• Another aspect of the invention relates to a method for controlling the intake of recycled air and exhaust gas (EGR) in a cylinder of an internal combustion engine of a motor vehicle, in which it is admitted in the cylinder, alternatively either air or recycled exhaust gas (EGR).
• EGR recycled air and exhaust gas
• the alternative admission sequences are piloted as a function of the position or the speed of the piston in the cylinder.
• the speed of the gases admitted to the cylinder can also be controlled.
• FIG. 1 the upper part of a cylinder 1 of an internal combustion engine and in particular of a diesel-type compression ignition engine is shown schematically.
• the engine comprises several identical cylinders.
• Different intake and exhaust ports are provided at the junction between the cylinder head, not shown, and the cylinder 1.
• a first intake duct 3 opens into a first inlet 4 and allows the sequential admission, either a stream of fresh air shown schematically by the arrow 5, conveyed in a bypass 3a, or an external recycled exhaust stream
• a second inlet duct 7 opens into a second inlet orifice 8 and also allows the admission of either a stream of fresh air, shown schematically by an arrow 5, conveyed in a bypass 7a, or, sequentially, a stream of recycled exhaust gas EGR symbolized by an arrow 6 and conveyed in a branch 7b.
• the cylinder also comprises two exhaust ducts 9 and 10 which each open into an exhaust port 11, 12, and allow the escape of the combustion gases in a flow materialized by the arrow 6 by an exhaust duct 13 in which the two ducts 9 and 10 meet.
• a fuel injector 14 able to inject a cloud of fuel at a suitable time in the combustion chamber.
• the four orifices 4, 8, 11 and 12 are, in the illustrated example, arranged substantially at regular intervals around the periphery of the cylinder 1.
• the orifices are of circular section and may be alternately open and closed by means of valves, represented.
• the intake ports 4 and 8 are arranged on the same side of the cylinder 1, while the exhaust ports 11 and 12 are arranged on the other side.
• An external bypass circuit materialized by the duct 15, stitched on the exhaust duct 13, allows the recirculation of a part of the exhaust gas, shown schematically by an arrow 6, in the direction of admission.
• a controlled valve 16 called “EGR valve” regulates the flow of recycled exhaust gas EGR according to the operation of the combustion engine.
• EGR valve regulates the flow of recycled exhaust gas EGR according to the operation of the combustion engine.
• a controlled control valve In each of the bypass duct 3a, a valve 17a is mounted and in the bypass duct 3b, a valve 17b.
• a valve 18a is mounted and in the bypass duct 7b, a valve 18b.
• control of these different control valves makes it possible to open or close the bypass ducts concerned. In this way, it is possible to admit into the intake port 4 via the intake duct 3, alternatively, either fresh air symbolized by the arrow 5 by the bypass duct. 3a when the control valve 17a is open, or a stream of recycled exhaust gas symbolized by the arrow 6 by the bypass duct 3b when the control valve 17b is open.
• the control valve 17a is open, the control valve 17b is closed and vice versa. In this way, the gases admitted through the intake duct 3 are sequentially fresh air, then EGR recycled exhaust gas or vice versa.
• the intake duct 7 which can alternatively convey a fresh air flow symbolized by the arrow 5, by the bypass duct 7a when the control valve 18a is open and, sequentially, a EGR gas flow through the bypass duct 7b when the control valve 18b is open.
• the control valves 18a and 18b are alternately, either open or closed, and when one of them is open, the other is closed, so the intake duct 7 sequentially conveys either a fresh air flow or an EGR gas flow.
• the speed of the gases admitted by the intake ducts 3 and 7 is dependent on the speed of the piston which moves inside the cylinder 1.
• the different types of gas being admitted into the combustion chamber sequentially, each The sequence will therefore have a different speed during admission to the combustion chamber.
• control valves 17a, 17b and 18a, 18b are arranged in the respective bypass ducts 3a, 3b and 7a, 7b, upstream of the junction point 21 or 22, where the respective bypass ducts 3a, 3b and 7a, 7b join to form the single inlet duct 3 or 7.
• a closing action of one of the control valves makes it possible to completely block the flow of the gas considered in the duct in which the regulating valve considered is mounted.
• the flow of gas admitted during the sequence corresponding to the closing of one of the control valves and the opening of the other control valve is indeed a gas consisting solely of either fresh air or recycled exhaust gas (EGR).
• EGR fresh air or recycled exhaust gas
• the adjustable flaps 19, 20, when they are provided are mounted in the intake ducts 3, 7 downstream of the junction points 21, 22 so as to act on the speed of the admitted gas flow, which whatever its nature.
• the control of the different control valves 17a, 17b and 18a, 18b, as of the EGR valve 16, and the shutters 19, 20 when present, is carried out by means of an electronic control unit 23, denoted ECU on the figure.
• This electronic control unit receives, by the connections symbolized by the arrow 24, different parameters of the operation of the engine and can generate various control signals that are transmitted through the connection to the EGR valve 16, through the connections 26 and 27 to the movable flaps 19 and 20, through the connections 28 and 29 to the control valves 17a and 17b, and through the connections 30. and 31 to the control valves 18a and 18b.
• the gas sequences in the combustion chamber are then generated as a function of the control strategies of the control valves 17a, 17b and 18a, 18b defined for example by a control software stored in the electronic control unit. 23.
• the speed of the admitted gases can be punctured by the position of the flaps 19 and 20.
• variable distribution device in another mode of regulation, not described in the figure, it is also possible to envisage using a variable distribution device by appropriately controlling, by signals transmitted by the electronic control unit, the opening movements. and closing the intake and exhaust valves.
• the cylinder 1 has had two intake ducts, it will of course be understood that the invention applies to other structures, for example comprising a single intake duct.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Exhaust-Gas Circulating Devices (AREA)
• Output Control And Ontrol Of Special Type Engine (AREA)
• Characterised By The Charging Evacuation (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=37027859

Family Applications (1)

Country Status (5)

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• 2005
  • 2005-11-21 FR FR0511765A patent/FR2893672B1/fr not_active Expired - Fee Related
• 2006
  • 2006-10-19 WO PCT/FR2006/051064 patent/WO2007057587A1/fr active Application Filing
  • 2006-10-19 EP EP06820320A patent/EP1952008A1/de not_active Withdrawn
  • 2006-10-19 RU RU2008125122/06A patent/RU2392471C2/ru not_active IP Right Cessation
  • 2006-10-19 CN CN2006800432418A patent/CN101313140B/zh not_active Expired - Fee Related

Non-Patent Citations (1)

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