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EP2855902A1 - Internal combustion engine fitted with an exhaust gas recirculation (egr) system and associated method for controlling the recirculation of gases - Google Patents

Internal combustion engine fitted with an exhaust gas recirculation (egr) system and associated method for controlling the recirculation of gases

Info

Publication number
EP2855902A1
EP2855902A1 EP13723182.5A EP13723182A EP2855902A1 EP 2855902 A1 EP2855902 A1 EP 2855902A1 EP 13723182 A EP13723182 A EP 13723182A EP 2855902 A1 EP2855902 A1 EP 2855902A1
Authority
EP
European Patent Office
Prior art keywords
egr
cylinder
dedicated
combustion
engine
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.)
Withdrawn
Application number
EP13723182.5A
Other languages
German (de)
French (fr)
Inventor
Julien Chapel
Martin RIBAULT-MENETIERE
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP2855902A1 publication Critical patent/EP2855902A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/02—Cutting-out
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
    • F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
    • 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]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
    • 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
    • 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
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • 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
    • F02M26/43—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 exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
    • F02B47/04—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only
    • F02B47/08—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only the substances including exhaust gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/021—Engine temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
    • F02D2700/05—Controlling by preventing combustion in one or more cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
    • F02D2700/05—Controlling by preventing combustion in one or more cylinders
    • F02D2700/052—Methods therefor
    • F02D2700/056—Methods therefor by interrupting the medium supply
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • 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 invention relates to an internal combustion engine equipped with a gas recirculation system, as well as to the method for controlling the recirculation of gases in such an engine.
  • the gases introduced into these combustion chambers consist on the one hand of air and on the other hand of gasoline or gas oil, in proportions proportionally dosed according to the engines and ignition systems used.
  • the gas mixture is then ignited in the combustion chamber.
  • Some known systems such as the system described in document US2009 / 0308070, comprise a recirculation duct capable of reinjecting all of the exhaust gases from the combustion chamber of one of the cylinders, called cylinder dedicated to the EGR, inside the intake manifold of the engine.
  • the invention proposes to inhibit under certain conditions the combustion inside the combustion chamber of the cylinder dedicated to the EGR during startup.
  • the air from the intake manifold enters the cylinder dedicated to the EGR and then spring to return to the inlet via the recirculation duct. This increases the rate of oxygen intake, which facilitates the engine start at very low temperatures.
  • the invention therefore relates to an internal combustion engine comprising: an air intake manifold, ⁇ an exhaust manifold, a plurality of cylinders each having a combustion chamber, and a recirculation duct suitable for reinject all the exhaust gases from the combustion chamber of at least one of the cylinders, said cylinder dedicated to the EGR, inside the air intake manifold, characterized in that it further comprises a control system configured to temporarily inhibit the combustion inside the chamber of combustion of the cylinder dedicated to the EGR.
  • control system is configured to inhibit combustion in the combustion chamber of the cylinder dedicated to the EGR when a temperature of the internal combustion engine is lower than a threshold temperature.
  • the threshold temperature is less than or equal to minus 10 degrees, preferably equal to minus 20 degrees.
  • control system is configured to provide a blockage of a fuel injection at the cylinder dedicated to the EGR.
  • control system is configured to ensure a blocking of the ignition of a candle associated with the cylinder dedicated to the EGR.
  • the invention further relates to a method for controlling the recirculation of gases in an internal combustion engine comprising: an air intake manifold, an exhaust manifold, ⁇ a plurality of cylinders each having a chamber of combustion, and a recirculation conduit adapted to reinject all of the exhaust gas from the combustion chamber of at least one of the cylinders, said cylinder dedicated to the EGR, inside the intake manifold. characterized in that it comprises the following steps: measuring the temperature of the internal combustion engine, comparing the measured temperature with a threshold temperature value, and inhibiting the combustion inside the combustion chamber associated with the cylinder dedicated to the EGR in the case where the measured temperature of the internal combustion engine is lower than the value of the threshold temperature.
  • the measurement of the engine temperature can be carried out specifically in the context of the method according to the invention or for any other pre-existing function: then the pre-existing temperature measurement is re-used.
  • the method comprises the step of blocking the fuel injection at said cylinder dedicated to the engine. EGR.
  • the method comprises the step of blocking the ignition of a spark plug of said cylinder dedicated to the EGR.
  • the temperature of the internal combustion engine is determined from the measurement of the temperature of the water and / or oil flowing in a circuit adjoining the engine.
  • Figure 1 shows a schematic representation of an internal combustion engine according to the invention provided with an exhaust gas recirculation system
  • Figure 2 shows a diagram of the main steps of the control method of the recirculation of the exhaust gas according to the invention. Identical, similar or similar elements retain the same reference from one figure to another.
  • Figure 1 shows a turbocharged 2.1-4 four-cylinder internal combustion engine 1.
  • the engine 1 comprises an engine block 3 in which are provided 5.1 -5.4 combustion chambers 2.1 -2.4 cylinders.
  • An intake manifold 8 receives air to be introduced into the combustion chamber 5.1 -5.4.
  • the intake air is sucked from outside the vehicle, through an air filter (not shown).
  • the direction of movement of the intake air is symbolized by the arrows 1 1.
  • a valve 12 ensures the management of the air flow introduced into the combustion chambers 5.1 -5.4 as a function of the operating conditions of the engine 1.
  • a fuel injection inside the combustion chamber 5.1 -5.4 is performed by means of injectors referenced 14.1 -14.4.
  • candles 16.1 -16.4 can ignite the gaseous mixture of air and fuel inside the chambers 5.1 -5.4 combustion.
  • an exhaust manifold 17 receives the emissions of gas produced by the combustion and directs them to an exhaust catalyst 19 adapted to treat the fumes before their expulsion to the outside atmosphere in a manner known per se.
  • the flow direction of the exhaust gases is represented by the arrows 20.
  • the cylinders 2.1 -2.3 which operate in a conventional manner, each have an inlet (associated with an inlet valve) in relation to the intake manifold 8 and an outlet (associated with an outlet valve) in relation with the exhaust manifold 17.
  • the cylinder 2.4 said cylinder dedicated to the EGR, has an inlet connected to the intake manifold 8 and an outlet also connected to the intake manifold 8 via a conduit 22 for recirculating gases.
  • the duct 22 thus ensures the reinjection of all the exhaust gases from the combustion chamber 5.4 of the cylinder 2.4 dedicated to the EGR inside the air intake manifold 8.
  • the flow direction of the gases in the duct 22 is indicated by the arrows 24.
  • the engine 1 further comprises a turbocharger 23 comprising a compression stage 25 and a stage 26 of relaxation.
  • the compression stage compresses the intake air to optimize the filling of combustion chambers 5.1-5.4.
  • the flow of the exhaust gas rotates a turbine of the stage 26 of expansion which then drives in rotation a turbine of the stage 25 of compression via a shaft 29 coupling connecting the two turbines between them.
  • the flow of the exhaust gas thus allows compression of the gases at the intake.
  • a first 31 and a second 32 heat exchangers are intended to cool, respectively, the air entering the intake manifold 8 and the gas flowing in the conduit 22 to avoid introducing too hot gases in 5.1 -5.4 combustion chambers, which would result in a loss of volumetric efficiency.
  • a second catalyst 33 exhaust is installed on the path of the recirculation conduit 22 to perform the treatment of exhaust gases from the cylinder 2.4 dedicated to the EGR before their reinjection into the collector 8 air intake.
  • the engine 1 also comprises sensors 35 and 36 for determining the temperature of a liquid of an auxiliary circuit of the engine, namely a water circuit of the engine or an engine oil circuit.
  • the vehicle also includes a sensor 37 for measuring the outside temperature.
  • These sensors 35-37 are in connection with a computer 40, said engine control computer, connected to a memory 41 containing instructions for managing the control of the various elements of the architecture of the engine.
  • This computer 40 thus ensures in particular the control of the injectors 14.1 -14.4 and where appropriate (for gasoline engines) spark plugs 16.1 -16.4 independently of each other.
  • the computer 40 and the memory 41 form the control system of the engine 1.
  • a first step 101 the computer 40 determines the temperature TM of the engine 1.
  • This temperature TM can be determined by means of one or both sensors 35, 36 for measuring the temperature of the water or oil flowing in one of the auxiliary circuits of the engine.
  • the sensor 37 At the start of the engine and provided that the vehicle has remained sufficient time to stop, it is even possible to directly use the value returned by the sensor 37 for measuring the outside temperature because in this case, all the elements of the vehicle have a temperature a priori substantially equal to the outside temperature of the vehicle environment.
  • the computer 40 compares the measured temperature TM with a threshold temperature TS below which operation of the engine 1 in a conventional EGR mode could disrupt the engine start.
  • this threshold temperature is less than minus 10 degrees and preferably equal to minus 20 degrees.
  • the computer 40 controls, in a step 103, the engine 1 according to a conventional EGR operating mode.
  • the conditions of fuel injection, air supply and ignition are then identical for all cylinders 2.1 -2.4 of the engine.
  • the exhaust gases from the cylinder 2.4 dedicated to the EGR are then reinjected into the intake manifold 8 via the recirculation conduit 22.
  • the computer 40 detects that the measured temperature TM is lower than the threshold temperature TS, the computer 40 inhibits, in a step 104, the combustion inside the combustion chamber 5.4 of the dedicated cylinder 2.4. at the EGR.
  • the other cylinders 2.1 -2.3 which are not dedicated to the EGR are controlled conventionally.
  • the air introduced into the combustion chamber 5.4 of the cylinder 2.4 dedicated to the EGR is thus reinjected as such into the air collector 8 via the recirculation duct 22.
  • This phenomenon of air reinjection is explained by the fact that the valves of cylinders 2.1 -2.4 are controlled by a camshaft whose profile is the same regardless of the cylinder considered. This makes it possible to increase the oxygen content in the air-fuel mixture in order to facilitate the starting of the engine 1 at very low temperatures.
  • the computer 40 blocks, in a step 105, the injection of fuel into the cylinder 2.4 dedicated to the EGR by a suitable control of the corresponding injector 14.4.
  • the computer 40 also blocks, in a step 106, the ignition of the spark plug 16.4 of the cylinder 2.4 dedicated to the EGR in the case of a gasoline engine.
  • the computer 40 controls the engine 1 in the conventional operating mode EGR.
  • the control system of the engine 1 makes it possible to temporarily inhibit the combustion inside the combustion chamber 5.4 of the cylinder 2.4 dedicated to the EGR during the period during which the temperature of the engine 1 is below the temperature threshold TS.
  • the skilled person can of course modify the architecture shown in the figures without departing from the scope of the invention described above. It will thus be able to modify the number of cylinders 2.1 -2.4 of the engine as well as the number of cylinders dedicated to the EGR. The skilled person may also consider any other system to effectively inhibit the combustion in the cylinder 2.4 dedicated to the EGR at low temperatures.
  • the combustion at the level of the cylinder 2.4 dedicated to the EGR is inhibited when the engine 1 has other operating conditions than operation at low temperatures in which an increase in the oxygen level at the intake is necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The invention concerns an internal combustion engine (1) comprising an air intake manifold (8), an exhaust manifold (17), a plurality of cylinders (2.1-2.4) each having a combustion chamber (5.1-5.4), and a recirculation conduit (22) capable of reinjecting all the exhaust gases from the combustion chamber (5.4) of at least one of the cylinders (2.4), referred to as the EGR-dedicated cylinder, into the air intake manifold (8). According to the invention, the engine (1 ) further comprises a control system (40, 41) configured to temporarily inhibit combustion inside the combustion chamber (5.4) of the EGR-dedicated cylinder (2.4). The invention also relates to the associated method for controlling the recirculation of gases.

Description

MOTEUR A COMBUSTION INTERNE MUNI D'UN SYSTEME DE  INTERNAL COMBUSTION ENGINE WITH A SYSTEM OF
RECIRCULATION DES GAZ D'ECHAPPEMENT (EGR) ET PROCEDE DE COMMANDE DE LA RECIRCULATION DES GAZ ASSOCIE  EXHAUST GAS RECIRCULATION (EGR) AND METHOD FOR CONTROLLING THE GAS RECIRCULATION THEREOF
DOMAINE TECHNIQUE DE L'INVENTION [oooi ] L'invention porte sur un moteur à combustion interne muni d'un système de recirculation des gaz, ainsi que sur le procédé de commande de la recirculation des gaz dans un tel moteur. TECHNICAL FIELD OF THE INVENTION The invention relates to an internal combustion engine equipped with a gas recirculation system, as well as to the method for controlling the recirculation of gases in such an engine.
ETAT DE LA TECHNIQUE STATE OF THE ART
[ooo2] Dans un moteur à combustion interne, les quatre temps du cycle thermodynamique - admission de gaz combustible et d'air, compression du mélange gazeux, détente due à l'explosion du mélange, échappement - se déroulent successivement dans des enceintes des cylindres du moteur thermique, dites chambres de combustion. Les gaz introduits dans ces chambres de combustion sont constitués d'une part d'air et d'autre part d'essence ou de gasoil, selon des proportions dosées de manière adéquate suivant les moteurs et les systèmes d'allumage utilisés. Le mélange gazeux est alors enflammé dans la chambre de combustion. [ooo2] In an internal combustion engine, the four stages of the thermodynamic cycle - fuel gas and air intake, compression of the gas mixture, expansion due to the explosion of the mixture, exhaust - take place successively in the enclosures of the cylinders of the engine, said combustion chambers. The gases introduced into these combustion chambers consist on the one hand of air and on the other hand of gasoline or gas oil, in proportions proportionally dosed according to the engines and ignition systems used. The gas mixture is then ignited in the combustion chamber.
[ooo3] Les gaz d'échappement des moteurs à combustion interne équipant la plupart des véhicules automobiles contiennent un certain nombre de polluants dont il est souhaitable de réduire les rejets dans l'atmosphère (notamment des oxydes d'azote, du monoxyde de carbone, des hydrocarbures imbrûlés, des particules et du dioxyde de carbone). Les réglementations applicables en matière de pollution par des véhicules automobiles abaissent régulièrement les plafonds de rejets acceptables. [ooo4] Une grande partie des polluants générés par un moteur à combustion interne est due à une combustion incomplète du carburant. Pour réduire les rejets polluants pénétrant dans la ligne d'échappement, il est connu de faire recirculer les gaz d'échappement vers l'admission d'air de la chambre de combustion. Un tel système est connu sous l'acronyme anglo-saxon de EGR pour « Exhaust Gas Recirculation ». [ooo5] Certains systèmes connus, tels que le système décrit dans le document US2009/0308070, comportent un conduit de recirculation apte à réinjecter la totalité des gaz d'échappement issus de la chambre de combustion d'un des cylindres, appelé cylindre dédié à l'EGR, à l'intérieur du collecteur d'admission du moteur. [ooo3] The exhaust gases of internal combustion engines in most motor vehicles contain a number of pollutants which it is desirable to reduce emissions to the atmosphere (including nitrogen oxides, carbon monoxide, unburned hydrocarbons, particulates and carbon dioxide). The regulations applicable to pollution by motor vehicles regularly lower the limits of acceptable discharges. [Ooo4] Much of the pollutants generated by an internal combustion engine is due to incomplete combustion of the fuel. To reduce the pollutant discharges entering the exhaust line, it is known to recirculate the exhaust gas to the air intake of the combustion chamber. Such a system is known by the Anglo-Saxon acronym EGR for "Exhaust Gas Recirculation". [Ooo5] Some known systems, such as the system described in document US2009 / 0308070, comprise a recirculation duct capable of reinjecting all of the exhaust gases from the combustion chamber of one of the cylinders, called cylinder dedicated to the EGR, inside the intake manifold of the engine.
[ooo6] Une telle architecture permet d'avoir naturellement et de manière continue une forte recirculation des gaz d'échappement. Pour un moteur ayant un cylindre dédié à l'EGR, le taux de recirculation des gaz d'échappement augmente en même temps que diminue le nombre de cylindres. Ainsi, le taux de recirculation est de 25% pour un moteur à quatre cylindres et de 33% pour un moteur à trois cylindres. [ooo6] Such an architecture makes it possible to have naturally and continuously a strong recirculation of the exhaust gases. For an engine having a cylinder dedicated to the EGR, the recirculation rate of the exhaust gas increases as the number of cylinders decreases. Thus, the recirculation rate is 25% for a four-cylinder engine and 33% for a three-cylinder engine.
[ooo7] Une des conséquences de la mise en œuvre d'un système EGR est que le mélange admis dans les chambres de combustion est appauvri en oxygène, ce qui peut perturber le démarrage du moteur en cas de très basses températures, par exemple inférieures ou égales à moins 20 degrés Celsius. OBJET DE L'INVENTION [ooo7] One of the consequences of implementing an EGR system is that the mixture admitted into the combustion chambers is depleted of oxygen, which can disturb the starting of the engine in case of very low temperatures, for example lower or equal to minus 20 degrees Celsius. OBJECT OF THE INVENTION
[ooo8] L'invention a pour but de remédier à cet inconvénient. [Ooo8] The invention aims to overcome this disadvantage.
[ooo9] A cet effet, l'invention propose d'inhiber sous certaines conditions la combustion à l'intérieur de la chambre de combustion du cylindre dédié à l'EGR lors du démarrage. Ainsi, l'air issu du collecteur d'admission entre dans le cylindre dédié à l'EGR puis ressort pour retourner à l'admission via le conduit de recirculation. On augmente ainsi le taux d'oxygène à l'admission, ce qui facilite le démarrage du moteur à très basses températures. [Ooo9] For this purpose, the invention proposes to inhibit under certain conditions the combustion inside the combustion chamber of the cylinder dedicated to the EGR during startup. Thus, the air from the intake manifold enters the cylinder dedicated to the EGR and then spring to return to the inlet via the recirculation duct. This increases the rate of oxygen intake, which facilitates the engine start at very low temperatures.
[ooi o] L'invention concerne donc un moteur à combustion interne comportant: un collecteur d'admission d'air, · un collecteur d'échappement, une pluralité de cylindres ayant chacun une chambre de combustion, et un conduit de recirculation apte à réinjecter la totalité des gaz d'échappement issus de la chambre de combustion d'au moins un des cylindres, dit cylindre dédié à l'EGR, à l'intérieur du collecteur d'admission d'air, caractérisé en ce qu'il comporte en outre un système de commande configuré pour inhiber temporairement la combustion à l'intérieur de la chambre de combustion du cylindre dédié à l'EGR. [Ooi o] The invention therefore relates to an internal combustion engine comprising: an air intake manifold, · an exhaust manifold, a plurality of cylinders each having a combustion chamber, and a recirculation duct suitable for reinject all the exhaust gases from the combustion chamber of at least one of the cylinders, said cylinder dedicated to the EGR, inside the air intake manifold, characterized in that it further comprises a control system configured to temporarily inhibit the combustion inside the chamber of combustion of the cylinder dedicated to the EGR.
[ooi i] Selon une réalisation, le système de commande est configuré pour inhiber la combustion dans la chambre de combustion du cylindre dédié à l'EGR lorsqu'une température du moteur à combustion interne est inférieure à une température seuil. [0012] Selon une réalisation, la température seuil est inférieure ou égale à moins 10 degrés, de préférence égale à moins 20 degrés. According to one embodiment, the control system is configured to inhibit combustion in the combustion chamber of the cylinder dedicated to the EGR when a temperature of the internal combustion engine is lower than a threshold temperature. According to one embodiment, the threshold temperature is less than or equal to minus 10 degrees, preferably equal to minus 20 degrees.
[0013] Selon une réalisation, le système de commande est configuré pour assurer un blocage d'une injection de carburant au niveau du cylindre dédié à l'EGR. In one embodiment, the control system is configured to provide a blockage of a fuel injection at the cylinder dedicated to the EGR.
[0014] Selon une réalisation, le système de commande est configuré pour assurer un blocage de l'allumage d'une bougie associée au cylindre dédié à l'EGR. According to one embodiment, the control system is configured to ensure a blocking of the ignition of a candle associated with the cylinder dedicated to the EGR.
[0015] L'invention concerne en outre un procédé de commande de la recirculation des gaz dans un moteur à combustion interne comportant: un collecteur d'admission d'air, un collecteur d'échappement, · une pluralité de cylindres ayant chacun une chambre de combustion, et un conduit de recirculation apte à réinjecter la totalité des gaz d'échappement issus de la chambre de combustion d'au moins un des cylindres, dit cylindre dédié à l'EGR, à l'intérieur du collecteur d'admission d'air, caractérisé en ce qu'il comporte les étapes suivantes: mesurer de la température du moteur à combustion interne, comparer la température mesurée avec une valeur de température seuil, et inhiber la combustion à l'intérieur de la chambre de combustion associée au cylindre dédié à l'EGR dans le cas où la température mesurée du moteur à combustion interne est inférieure à la valeur de la température seuil. [0016] La mesure de la température du moteur peut être réalisée spécifiquement dans le cadre du procédé selon l'invention ou pour toute autre fonction préexistante : on remploi alors la mesure de température préexistante. The invention further relates to a method for controlling the recirculation of gases in an internal combustion engine comprising: an air intake manifold, an exhaust manifold, · a plurality of cylinders each having a chamber of combustion, and a recirculation conduit adapted to reinject all of the exhaust gas from the combustion chamber of at least one of the cylinders, said cylinder dedicated to the EGR, inside the intake manifold. characterized in that it comprises the following steps: measuring the temperature of the internal combustion engine, comparing the measured temperature with a threshold temperature value, and inhibiting the combustion inside the combustion chamber associated with the cylinder dedicated to the EGR in the case where the measured temperature of the internal combustion engine is lower than the value of the threshold temperature. The measurement of the engine temperature can be carried out specifically in the context of the method according to the invention or for any other pre-existing function: then the pre-existing temperature measurement is re-used.
[0017] Selon une mise en œuvre, pour inhiber la combustion à l'intérieur de la chambre de combustion du cylindre dédié à l'EGR, le procédé comporte l'étape de bloquer l'injection de carburant au niveau dudit cylindre dédié à l'EGR. According to one embodiment, to inhibit the combustion inside the combustion chamber of the cylinder dedicated to the EGR, the method comprises the step of blocking the fuel injection at said cylinder dedicated to the engine. EGR.
[0018] Selon une mise en œuvre, pour inhiber la combustion à l'intérieur de la chambre de combustion du cylindre dédié à l'EGR, le procédé comporte l'étape de bloquer l'allumage d'une bougie dudit cylindre dédié à l'EGR. According to one implementation, to inhibit the combustion inside the combustion chamber of the cylinder dedicated to the EGR, the method comprises the step of blocking the ignition of a spark plug of said cylinder dedicated to the EGR.
[0019] Selon une mise en œuvre, on arrête d'inhiber la combustion dans la chambre de combustion du cylindre dédié à l'EGR lorsque la température du moteur à combustion interne devient supérieure à la température seuil. According to one embodiment, it stops to inhibit the combustion in the combustion chamber of the cylinder dedicated to the EGR when the temperature of the internal combustion engine becomes greater than the threshold temperature.
[0020] Selon une mise en œuvre, la température du moteur à combustion interne est déterminée à partir de la mesure de la température de l'eau et/ou de l'huile circulant dans un circuit annexe au moteur. BREVE DESCRIPTION DES FIGURES According to one embodiment, the temperature of the internal combustion engine is determined from the measurement of the temperature of the water and / or oil flowing in a circuit adjoining the engine. BRIEF DESCRIPTION OF THE FIGURES
[0021 ] L'invention sera mieux comprise à la lecture de la description qui suit et à l'examen des figures qui l'accompagnent. Ces figures ne sont données qu'à titre illustratif mais nullement limitatif de l'invention. The invention will be better understood on reading the description which follows and the examination of the figures that accompany it. These figures are given for illustrative but not limiting of the invention.
[0022] La figure 1 montre une représentation schématique d'un moteur à combustion interne selon l'invention muni d'un système de recirculation des gaz d'échappement ; [0022] Figure 1 shows a schematic representation of an internal combustion engine according to the invention provided with an exhaust gas recirculation system;
[0023] La figure 2 montre un diagramme des étapes principales du procédé de commande de la recirculation des gaz d'échappement selon l'invention. [0024] Les éléments identiques, similaires ou analogues conservent la même référence d'une figure à l'autre. Figure 2 shows a diagram of the main steps of the control method of the recirculation of the exhaust gas according to the invention. Identical, similar or similar elements retain the same reference from one figure to another.
DESCRIPTION D'EXEMPLES DE REALISATION DE L'INVENTION DESCRIPTION OF EXAMPLES OF EMBODIMENT OF THE INVENTION
[0025] La figure 1 montre un moteur 1 à combustion interne à quatre cylindres 2.1 -2.4 turbocompressé. Le moteur 1 comprend un bloc moteur 3 dans lequel sont ménagés des chambres 5.1 -5.4 de combustion des cylindres 2.1 -2.4. [0025] Figure 1 shows a turbocharged 2.1-4 four-cylinder internal combustion engine 1. The engine 1 comprises an engine block 3 in which are provided 5.1 -5.4 combustion chambers 2.1 -2.4 cylinders.
[0026] Un collecteur 8 d'admission reçoit de l'air à introduire dans les chambres 5.1 -5.4 de combustion. L'air d'admission est aspiré depuis l'extérieur du véhicule, par l'intermédiaire d'un filtre à air (non représenté). Le sens de déplacement de l'air d'admission est symbolisé par les flèches 1 1 . Une vanne 12 assure la gestion du débit d'air introduit dans les chambres 5.1 -5.4 de combustion en fonction des conditions de fonctionnement du moteur 1 . An intake manifold 8 receives air to be introduced into the combustion chamber 5.1 -5.4. The intake air is sucked from outside the vehicle, through an air filter (not shown). The direction of movement of the intake air is symbolized by the arrows 1 1. A valve 12 ensures the management of the air flow introduced into the combustion chambers 5.1 -5.4 as a function of the operating conditions of the engine 1.
[0027] Une injection de carburant à l'intérieur les chambres 5.1 -5.4 de combustion est effectuée au moyen d'injecteurs référencés 14.1 -14.4. En outre, dans le cas d'un moteur à essence, des bougies 16.1 -16.4 permettent d'enflammer le mélange gazeux d'air et de carburant à l'intérieur des chambres 5.1 -5.4 de combustion. A fuel injection inside the combustion chamber 5.1 -5.4 is performed by means of injectors referenced 14.1 -14.4. In addition, in the case of a gasoline engine, candles 16.1 -16.4 can ignite the gaseous mixture of air and fuel inside the chambers 5.1 -5.4 combustion.
[0028] Par ailleurs, un collecteur 17 d'échappement reçoit les émissions de gaz produites par la combustion et les dirige vers un catalyseur d'échappement 19 adapté à traiter les fumées avant leur expulsion vers l'atmosphère extérieure de façon connue en soi. Le sens de circulation des gaz d'échappement est représenté par les flèches 20. Furthermore, an exhaust manifold 17 receives the emissions of gas produced by the combustion and directs them to an exhaust catalyst 19 adapted to treat the fumes before their expulsion to the outside atmosphere in a manner known per se. The flow direction of the exhaust gases is represented by the arrows 20.
[0029] Les cylindres 2.1 -2.3, qui fonctionnent de manière classique, présentent chacun une entrée (associée à une soupape d'entrée) en relation avec le collecteur 8 d'admission et une sortie (associée à une soupape de sortie) en relation avec le collecteur 17 d'échappement. Le cylindre 2.4, dit cylindre dédié à l'EGR, présente une entrée reliée au collecteur 8 d'admission et une sortie reliée également au collecteur 8 d'admission par l'intermédiaire d'un conduit 22 de recirculation des gaz. Le conduit 22 assure ainsi la réinjection de la totalité des gaz d'échappements issus de la chambre 5.4 de combustion du cylindre 2.4 dédié à l'EGR à l'intérieur du collecteur 8 d'admission d'air. Le sens de circulation des gaz dans le conduit 22 est indiqué par les flèches 24. [0030] Le moteur 1 comporte en outre un turbocompresseur 23 comprenant un étage 25 de compression et un étage 26 de détente. L'étage 25 de compression comprime l'air d'admission afin d'optimiser le remplissage des chambres 5.1 -5.4 de combustion. L'écoulement des gaz d'échappement entraîne en rotation une turbine de l'étage 26 de détente qui entraîne alors en rotation une turbine de l'étage 25 de compression par l'intermédiaire d'un arbre 29 d'accouplement reliant les deux turbines entre elles. L'écoulement des gaz d'échappement permet ainsi de réaliser une compression des gaz au niveau de l'admission. The cylinders 2.1 -2.3, which operate in a conventional manner, each have an inlet (associated with an inlet valve) in relation to the intake manifold 8 and an outlet (associated with an outlet valve) in relation with the exhaust manifold 17. The cylinder 2.4, said cylinder dedicated to the EGR, has an inlet connected to the intake manifold 8 and an outlet also connected to the intake manifold 8 via a conduit 22 for recirculating gases. The duct 22 thus ensures the reinjection of all the exhaust gases from the combustion chamber 5.4 of the cylinder 2.4 dedicated to the EGR inside the air intake manifold 8. The flow direction of the gases in the duct 22 is indicated by the arrows 24. The engine 1 further comprises a turbocharger 23 comprising a compression stage 25 and a stage 26 of relaxation. The compression stage compresses the intake air to optimize the filling of combustion chambers 5.1-5.4. The flow of the exhaust gas rotates a turbine of the stage 26 of expansion which then drives in rotation a turbine of the stage 25 of compression via a shaft 29 coupling connecting the two turbines between them. The flow of the exhaust gas thus allows compression of the gases at the intake.
[0031 ] Un premier 31 et un second 32 échangeurs thermiques sont destinés à refroidir, respectivement, l'air entrant dans le collecteur 8 d'admission et les gaz circulant dans le conduit 22 afin d'éviter d'introduire des gaz trop chauds dans les chambres 5.1 -5.4 de combustion, ce qui entraînerait une perte de rendement volumétrique. A first 31 and a second 32 heat exchangers are intended to cool, respectively, the air entering the intake manifold 8 and the gas flowing in the conduit 22 to avoid introducing too hot gases in 5.1 -5.4 combustion chambers, which would result in a loss of volumetric efficiency.
[0032] De préférence, un deuxième catalyseur 33 d'échappement est installé sur le chemin du conduit 22 de recirculation afin d'effectuer le traitement des gaz d'échappement issus du cylindre 2.4 dédié à l'EGR avant leur réinjection dans le collecteur 8 d'admission d'air. Preferably, a second catalyst 33 exhaust is installed on the path of the recirculation conduit 22 to perform the treatment of exhaust gases from the cylinder 2.4 dedicated to the EGR before their reinjection into the collector 8 air intake.
[0033] Le moteur 1 comporte également des capteurs 35 et 36 permettant de déterminer la température d'un liquide d'un circuit annexe du moteur, à savoir un circuit d'eau du moteur ou un circuit d'huile du moteur. Le véhicule comporte également un capteur 37 de mesure de la température extérieure. Ces capteurs 35-37 sont en relation avec un calculateur 40, dit calculateur de commande moteur, connecté à une mémoire 41 contenant des instructions pour gérer la commande des différents éléments de l'architecture du moteur. Ce calculateur 40 assure ainsi notamment la commande des injecteurs 14.1 -14.4 et le cas échéant (pour les moteurs à essence) des bougies 16.1 -16.4 d'allumage indépendamment les uns des autres. Le calculateur 40 et la mémoire 41 forment le système de commande du moteur 1 . The engine 1 also comprises sensors 35 and 36 for determining the temperature of a liquid of an auxiliary circuit of the engine, namely a water circuit of the engine or an engine oil circuit. The vehicle also includes a sensor 37 for measuring the outside temperature. These sensors 35-37 are in connection with a computer 40, said engine control computer, connected to a memory 41 containing instructions for managing the control of the various elements of the architecture of the engine. This computer 40 thus ensures in particular the control of the injectors 14.1 -14.4 and where appropriate (for gasoline engines) spark plugs 16.1 -16.4 independently of each other. The computer 40 and the memory 41 form the control system of the engine 1.
[0034] On décrit ci-après, en référence avec la figure 2, les différentes étapes du procédé de commande de la recirculation des gaz d'échappement mis en œuvre par le moteur 1 selon l'invention. [0035] Dans une première étape 101 , le calculateur 40 détermine la température TM du moteur 1 . Cette température TM peut être déterminée au moyen d'un ou des deux capteurs 35, 36 de mesure de la température de l'eau ou de l'huile circulant dans un des circuits annexes du moteur. Au moment du démarrage du moteur thermique et sous réserve que le véhicule soit resté suffisamment de temps à l'arrêt, il est même possible d'utiliser directement la valeur retournée par le capteur 37 de mesure de la température extérieure car dans ce cas, tous les éléments du véhicule ont une température a priori sensiblement égale à la température extérieure de l'environnement du véhicule. [0036] Dans une étape 102, le calculateur 40 compare ensuite la température mesurée TM avec une température seuil TS en dessous de laquelle un fonctionnement du moteur 1 suivant un mode EGR classique risquerait de perturber le démarrage du moteur. Dans un exemple, cette température seuil est inférieure à moins 10 degrés et de préférence égale à moins 20 degrés. [0037] Dans le cas où la température mesurée TM est supérieure à la température seuil TS, alors le calculateur 40 commande, dans une étape 103, le moteur 1 suivant un mode de fonctionnement EGR classique. Les conditions d'injection de carburant, d'apport d'air et d'allumage sont alors identiques pour tous les cylindres 2.1 -2.4 du moteur. Les gaz d'échappement issus du cylindre 2.4 dédiés à l'EGR sont alors réinjectés dans le collecteur 8 d'admission via le conduit 22 de recirculation. Described below, with reference to Figure 2, the various steps of the control method of the exhaust gas recirculation implemented by the engine 1 according to the invention. In a first step 101, the computer 40 determines the temperature TM of the engine 1. This temperature TM can be determined by means of one or both sensors 35, 36 for measuring the temperature of the water or oil flowing in one of the auxiliary circuits of the engine. At the start of the engine and provided that the vehicle has remained sufficient time to stop, it is even possible to directly use the value returned by the sensor 37 for measuring the outside temperature because in this case, all the elements of the vehicle have a temperature a priori substantially equal to the outside temperature of the vehicle environment. In a step 102, the computer 40 then compares the measured temperature TM with a threshold temperature TS below which operation of the engine 1 in a conventional EGR mode could disrupt the engine start. In one example, this threshold temperature is less than minus 10 degrees and preferably equal to minus 20 degrees. In the case where the measured temperature TM is greater than the threshold temperature TS, then the computer 40 controls, in a step 103, the engine 1 according to a conventional EGR operating mode. The conditions of fuel injection, air supply and ignition are then identical for all cylinders 2.1 -2.4 of the engine. The exhaust gases from the cylinder 2.4 dedicated to the EGR are then reinjected into the intake manifold 8 via the recirculation conduit 22.
[0038] En revanche, lorsque le calculateur 40 détecte que la température mesurée TM est inférieure à la température seuil TS, le calculateur 40 inhibe, dans une étape 104, la combustion à l'intérieur de la chambre 5.4 de combustion du cylindre 2.4 dédié à l'EGR. Les autres cylindres 2.1 -2.3 qui ne sont pas dédiés à l'EGR sont commandés de manière classique. L'air introduit dans la chambre 5.4 de combustion du cylindre 2.4 dédié à l'EGR est ainsi réinjecté tel quel dans le collecteur 8 d'air via le conduit 22 de recirculation. Ce phénomène de réinjection de l'air s'explique par le fait que les soupapes des cylindres 2.1 -2.4 sont commandées par un arbre à cames dont le profil est le même quel que soit le cylindre considéré. Cela permet d'augmenter le taux d'oxygène dans le mélange air-carburant afin de faciliter le démarrage du moteur 1 à très basses températures. On the other hand, when the computer 40 detects that the measured temperature TM is lower than the threshold temperature TS, the computer 40 inhibits, in a step 104, the combustion inside the combustion chamber 5.4 of the dedicated cylinder 2.4. at the EGR. The other cylinders 2.1 -2.3 which are not dedicated to the EGR are controlled conventionally. The air introduced into the combustion chamber 5.4 of the cylinder 2.4 dedicated to the EGR is thus reinjected as such into the air collector 8 via the recirculation duct 22. This phenomenon of air reinjection is explained by the fact that the valves of cylinders 2.1 -2.4 are controlled by a camshaft whose profile is the same regardless of the cylinder considered. This makes it possible to increase the oxygen content in the air-fuel mixture in order to facilitate the starting of the engine 1 at very low temperatures.
[0039] A cet effet, le calculateur 40 bloque, dans une étape 105, l'injection de carburant dans le cylindre 2.4 dédié à l'EGR par une commande adaptée de l'injecteur 14.4 correspondant. De préférence, mais ce n'est pas obligatoire, le calculateur 40 bloque également, dans une étape 106, l'allumage de la bougie 16.4 du cylindre 2.4 dédié à l'EGR dans le cas d'un moteur à essence. For this purpose, the computer 40 blocks, in a step 105, the injection of fuel into the cylinder 2.4 dedicated to the EGR by a suitable control of the corresponding injector 14.4. Preferably, but this is not mandatory, the computer 40 also blocks, in a step 106, the ignition of the spark plug 16.4 of the cylinder 2.4 dedicated to the EGR in the case of a gasoline engine.
[0040] Dès que le calculateur 40 détecte que, après une certaine durée de fonctionnement, la température TM du moteur dépasse la température seuil TS, le calculateur 40 commande le moteur 1 dans le mode de fonctionnement classique EGR. Ainsi, le système de commande du moteur 1 permet d'inhiber temporairement la combustion à l'intérieur de la chambre 5.4 de combustion du cylindre 2.4 dédié à l'EGR, pendant la période durant laquelle la température du moteur 1 est inférieure à la température seuil TS. [0041 ] L'homme du métier pourra bien entendu modifier l'architecture présentée dans les figures sans sortir du cadre de l'invention décrite ci-dessus. Il pourra ainsi modifier le nombre de cylindres 2.1 -2.4 du moteur ainsi que le nombre de cylindres dédiés à l'EGR. L'homme du métier pourra également envisager tout autre système permettant d'inhiber efficacement la combustion dans le cylindre 2.4 dédié à l'EGR en cas de basses températures. En variante également, la combustion au niveau du cylindre 2.4 dédié à l'EGR est inhibée lorsque le moteur 1 présente d'autres conditions de fonctionnement qu'un fonctionnement à basses températures dans lesquelles une augmentation du taux d'oxygène à l'admission est nécessaire. As soon as the computer 40 detects that after a certain period of operation, the engine temperature TM exceeds the threshold temperature TS, the computer 40 controls the engine 1 in the conventional operating mode EGR. Thus, the control system of the engine 1 makes it possible to temporarily inhibit the combustion inside the combustion chamber 5.4 of the cylinder 2.4 dedicated to the EGR during the period during which the temperature of the engine 1 is below the temperature threshold TS. The skilled person can of course modify the architecture shown in the figures without departing from the scope of the invention described above. It will thus be able to modify the number of cylinders 2.1 -2.4 of the engine as well as the number of cylinders dedicated to the EGR. The skilled person may also consider any other system to effectively inhibit the combustion in the cylinder 2.4 dedicated to the EGR at low temperatures. In a variant also, the combustion at the level of the cylinder 2.4 dedicated to the EGR is inhibited when the engine 1 has other operating conditions than operation at low temperatures in which an increase in the oxygen level at the intake is necessary.

Claims

REVENDICATIONS
1. Moteur (1 ) à combustion interne comportant: An internal combustion engine (1) comprising:
un collecteur (8) d'admission d'air, un collecteur (17) d'échappement, · une pluralité de cylindres (2.1 -2.4) ayant chacun une chambre an air intake manifold (8), an exhaust manifold (17), · a plurality of cylinders (2.1-2.4) each having a chamber
(5.1 -5.4) de combustion, et un conduit (22) de recirculation apte à réinjecter la totalité des gaz d'échappement issus de la chambre (5.4) de combustion d'au moins un des cylindres (2.4), dit cylindre dédié à l'EGR, à l'intérieur du collecteur (8) d'admission d'air, caractérisé en ce qu'il comporte en outre un système de commande (40, 41 ) configuré pour inhiber temporairement la combustion à l'intérieur de la chambre (5.4) de combustion du cylindre (2.4) dédié à l'EGR. (5.1 -5.4) combustion, and a recirculation conduit (22) adapted to reinject all the exhaust gas from the combustion chamber (5.4) of at least one of the cylinders (2.4), said cylinder dedicated to the EGR, inside the manifold (8) of air intake, characterized in that it further comprises a control system (40, 41) configured to temporarily inhibit combustion inside the combustion chamber (5.4) of the cylinder (2.4) dedicated to the EGR.
2. Moteur selon la revendication 1 , caractérisé en ce que le système de commande (40, 41 ) est configuré pour inhiber la combustion dans la chambre2. Engine according to claim 1, characterized in that the control system (40, 41) is configured to inhibit the combustion in the chamber
(5.4) de combustion du cylindre (2.4) dédié à l'EGR lorsqu'une température (TM) du moteur à combustion interne est inférieure à une température seuil (TS). (5.4) combustion of the cylinder (2.4) dedicated to the EGR when a temperature (TM) of the internal combustion engine is less than a threshold temperature (TS).
3. Moteur selon la revendication 2, caractérisé en ce que la température seuil (TS) est inférieure ou égale à moins 10 degrés, de préférence égale à moins 20 degrés. 3. Engine according to claim 2, characterized in that the threshold temperature (TS) is less than or equal to minus 10 degrees, preferably equal to minus 20 degrees.
4. Moteur selon l'une des revendications 1 à 3, caractérisé en ce que le système de commande (40, 41 ) est configuré pour assurer un blocage d'une injection de carburant au niveau du cylindre (2.4) dédié à l'EGR. 4. Motor according to one of claims 1 to 3, characterized in that the control system (40, 41) is configured to ensure a blockage of a fuel injection at the cylinder (2.4) dedicated to the EGR .
5. Moteur selon l'une des revendications 1 à 4, caractérisé en ce que le système de commande (40, 41 ) est configuré pour assurer un blocage de l'allumage d'une bougie (16.4) associée au cylindre (2.4) dédié à l'EGR. 5. Motor according to one of claims 1 to 4, characterized in that the control system (40, 41) is configured to ensure a blocking of the ignition of a candle (16.4) associated with the cylinder (2.4) dedicated at the EGR.
6. Procédé de commande de la recirculation des gaz dans un moteur (1 ) à combustion interne comportant: un collecteur (8) d'admission d'air, un collecteur (17) d'échappement, · une pluralité de cylindres (2.1 -2.4) ayant chacun une chambreA method of controlling the recirculation of gases in an internal combustion engine (1) comprising: an air intake manifold (8), an exhaust manifold (17), a plurality of cylinders (2.1), 2.4) each having a room
(5.1 -5.4) de combustion, et un conduit (22) de recirculation apte à réinjecter la totalité des gaz d'échappement issus de la chambre (5.4) de combustion d'au moins un des cylindres (2.4), dit cylindre dédié à l'EGR, à l'intérieur du collecteur (8) d'admission d'air, caractérisé en ce qu'il comporte les étapes suivantes: mesurer de la température (TM) du moteur à combustion interne, comparer la température mesurée (TM) avec une valeur de température seuil (TS), et · inhiber la combustion à l'intérieur de la chambre (5.4) de combustion associée au cylindre (2.4) dédié à l'EGR dans le cas où la température mesurée (TM) du moteur à combustion interne est inférieure à la valeur de la température seuil (TS). (5.1 -5.4) combustion, and a recirculation conduit (22) adapted to reinject all the exhaust gas from the combustion chamber (5.4) of at least one of the cylinders (2.4), said cylinder dedicated to the EGR, inside the air intake manifold (8), characterized in that it comprises the following steps: measuring the temperature (TM) of the internal combustion engine, comparing the measured temperature (TM) ) with a threshold temperature value (TS), and · inhibiting the combustion inside the combustion chamber (5.4) associated with the cylinder (2.4) dedicated to the EGR in the case where the measured temperature (TM) of the internal combustion engine is less than the value of the threshold temperature (TS).
7. Procédé selon la revendication 6, caractérisé en ce que, pour inhiber la combustion à l'intérieur de la chambre (5.4) de combustion du cylindre (2.4) dédié à l'EGR, il comporte l'étape de bloquer l'injection de carburant au niveau dudit cylindre (2.4) dédié à l'EGR. 7. Method according to claim 6, characterized in that, to inhibit combustion inside the combustion chamber (5.4) of the cylinder (2.4) dedicated to the EGR, it comprises the step of blocking the injection fuel at said cylinder (2.4) dedicated to the EGR.
8. Procédé selon la revendication 6 ou 7, caractérisé en ce que, pour inhiber la combustion à l'intérieur de la chambre (5.4) de combustion du cylindre (2.4) dédié à l'EGR, il comporte l'étape de bloquer l'allumage d'une bougie (16.4) dudit cylindre (2.4) dédié à l'EGR. 8. Method according to claim 6 or 7, characterized in that, to inhibit the combustion inside the combustion chamber (5.4) of the cylinder (2.4) dedicated to the EGR, it comprises the step of blocking the igniting a candle (16.4) of said cylinder (2.4) dedicated to the EGR.
9. Procédé selon l'une des revendications 6 à 8, caractérisé en ce qu'on arrête d'inhiber la combustion dans la chambre (5.4) de combustion du cylindre (2.4) dédié à l'EGR lorsque la température (TM) du moteur à combustion interne devient supérieure à la température seuil (TS). 9. Method according to one of claims 6 to 8, characterized in that it stops inhibiting the combustion in the chamber (5.4) of combustion of the cylinder (2.4) dedicated to the EGR when the temperature (TM) of the internal combustion engine becomes higher than the threshold temperature (TS).
10. Procédé selon l'une des revendications 6 à 9, caractérisé en ce que la température (TM) du moteur à combustion interne est déterminée à partir de la mesure de la température de l'eau et/ou de l'huile circulant dans un circuit annexe au moteur. 10. Method according to one of claims 6 to 9, characterized in that the temperature (TM) of the internal combustion engine is determined from the measurement of the temperature of the water and / or the oil flowing in an auxiliary circuit to the engine.
EP13723182.5A 2012-05-24 2013-04-18 Internal combustion engine fitted with an exhaust gas recirculation (egr) system and associated method for controlling the recirculation of gases Withdrawn EP2855902A1 (en)

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FR1254756A FR2990996B1 (en) 2012-05-24 2012-05-24 INTERNAL COMBUSTION ENGINE WITH AN EXHAUST GAS RECIRCULATION SYSTEM (EGR) AND METHOD OF CONTROLLING THE GAS RECIRCULATION THEREFOR
PCT/FR2013/050853 WO2013175091A1 (en) 2012-05-24 2013-04-18 Internal combustion engine fitted with an exhaust gas recirculation (egr) system and associated method for controlling the recirculation of gases

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