EP2044311A2 - Method for controlling a combustion engine during a temporary stoppage and corresponding control device - Google Patents

Method for controlling a combustion engine during a temporary stoppage and corresponding control device

Info

Publication number
EP2044311A2
EP2044311A2 EP07823332A EP07823332A EP2044311A2 EP 2044311 A2 EP2044311 A2 EP 2044311A2 EP 07823332 A EP07823332 A EP 07823332A EP 07823332 A EP07823332 A EP 07823332A EP 2044311 A2 EP2044311 A2 EP 2044311A2
Authority
EP
European Patent Office
Prior art keywords
engine
valves
intake
exhaust
during
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Withdrawn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
EP07823332A
Other languages
German (de)
French (fr)
Inventor
Vanessa Picron
Claudine Rochette
Benoît BIZET
Anthony Girardin
Claudiu Vasilescu
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.)
Valeo Systemes de Controle Moteur SAS
Original Assignee
Valeo Systemes de Controle Moteur SAS
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 Valeo Systemes de Controle Moteur SAS filed Critical Valeo Systemes de Controle Moteur SAS
Publication of EP2044311A2 publication Critical patent/EP2044311A2/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Withdrawn legal-status Critical Current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
    • 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
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/08—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing for rendering engine inoperative or idling
    • 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
    • F02D41/0002—Controlling intake air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/03—Stopping; Stalling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0203—Variable control of intake and exhaust valves
    • F02D13/0207—Variable control of intake and exhaust valves changing valve lift or valve lift and timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0253—Fully variable control of valve lift and timing using camless actuation systems such as hydraulic, pneumatic or electromagnetic actuators, e.g. solenoid valves
    • 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
    • F02D41/0002—Controlling intake air
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • 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
    • F02D41/0002—Controlling intake air
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • F02D2041/0012—Controlling intake air for engines with variable valve actuation with selective deactivation of cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/28—Control for reducing torsional vibrations, e.g. at acceleration
    • 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
    • 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
    • F02D41/065—Introducing corrections for particular operating conditions for engine starting or warming up for starting at hot start or restart
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/004—Aiding engine start by using decompression means or variable valve actuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N9/00—Starting of engines by supplying auxiliary pressure fluid to their working chambers
    • F02N9/04—Starting of engines by supplying auxiliary pressure fluid to their working chambers the pressure fluid being generated otherwise, e.g. by compressing air
    • 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
    • Y02T10/12—Improving ICE efficiencies
    • 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

  • a method of controlling a heat engine during a temporary stop and corresponding control device is a method of controlling a heat engine during a temporary stop and corresponding control device.
  • the present invention relates to a method for controlling a heat engine during a temporary stop and the corresponding device.
  • a four-stroke engine of a motor vehicle generally comprises a block defining cylinders defining combustion chambers in each of which is mounted a piston connected to a crankshaft connected via the gearbox to the wheels of. motor vehicle to drive them in rotation.
  • an intake duct and an exhaust duct are provided with valves movable between opening and closing positions. The valves are moved between their two positions via camshafts driven by the engine.
  • the combustion engine also includes a fuel combustion chamber supplying device and an engine management unit connected to the fueling device and the ignition circuit in the case of a spark ignition engine.
  • the electricity used in the vehicle is provided by an alternator driven by the engine and connected to the vehicle battery to recharge it.
  • the engine is started by a starter which is connected to the battery and which has an output gear meshing on a ring gear secured to the crankshaft. It is also known to use an alternator-starter which alternately performs alternator and starter functions.
  • the alternator starter controlled as starter allows a fast start of the engine.
  • the actuator is controlled to immobilize the valves as quickly as possible to reduce the noise related to the movement of the valves, noise that could be inconvenient when stopping the engine during which the general sound level is relatively low.
  • the object of the invention is to provide a method and a device facilitating restarting.
  • a control method during a temporary stop of a four-stroke thermal engine comprising a block delimiting cylinders defining combustion chambers which are equipped with pistons and into which open an intake duct and an exhaust duct provided with movable valves between the open positions and the closed positions, the method comprising the steps of detecting the conditions of a temporary stopping of the engine and of control a hold of the intake valves in the closed position after a passage through an intake phase during a last cycle of the engine before the temporary stop.
  • the intake cylinder remains filled until restart so that the starting torque is applied from the first half-turn crankshaft.
  • the exhaust valves are also kept closed during a last engine cycle before the temporary stop.
  • the cylinder which would normally be empty at the end of the exhaust phase is filled with compressed gas so that during start-up the engine benefits from an additional torque resulting from the expansion of this gas.
  • the method comprises the step of cutting the injection during an intake phase preceding the holding of the exhaust valves in the position. closed. This avoids the release of unburned fuel into the atmosphere when the engine is restarted.
  • this relates to a device for controlling the operation of a four-stroke thermal engine
  • a device for controlling the operation of a four-stroke thermal engine comprising a block delimiting cylinders defining combustion chambers which are equipped with pistons and in which a piston intake duct and an exhaust duct provided with valves movable between open and closed positions, the combustion engine also comprising a device for supplying the combustion chambers with fuel and at least one electromagnetic valve actuator, in wherein a management unit is configured to detect conditions of a temporary stopping of the engine and to command a hold of the intake valves in the closed position after a passage through an intake phase during a last cycle of the front engine shutdown.
  • the feed device comprises a combustion chamber injection member and the management unit is arranged to temporarily stop the engine by successively controlling in the combustion chambers a shutdown of the combustion chamber. the injection member and an immobilization of the valve controlled by one actuator.
  • Maintaining the valves in the closed position generates, in the combustion chambers, the establishment of counterpressures which oppose the movements of the pistons and thus accelerate the stopping of the engine.
  • the immobilization of the intake valve in the closed position at the end of an intake phase makes it possible to keep fresh gases in the cylinders, thus making it easier to restart the engine.
  • FIG. 1 is a schematic perspective view of a heat engine incorporating a control device according to the invention
  • FIG. 2 is a partial schematic cross-sectional view of this motor
  • FIG. 3 is a diagram schematically showing the operating cycles of the motor as a function of time.
  • the heat engine comprises a block 10 delimiting four cylinders 1, 2, 3, 4 in line.
  • the cylinders 1 and 4 frame the cylinders 2 and 3.
  • Each cylinder 1, 2, 3, 4 defines a chamber 5 closed on one side by a cylinder head 6 and on the other side by a piston 7 movable to slide in the cylinder 1, 2, 3, 4 between two extreme positions (top dead center and bottom dead center) and connected by a rod 8 to a crankshaft 9 pivotally mounted in the block 10.
  • Each combustion chamber 5 open an intake duct 11 and an exhaust duct 12 which are formed in the cylinder head 6.
  • the intake duct 11 and the exhaust duct 12 are each equipped with a intake valve 13 and an exhaust valve 14 moved between two open and closed positions by electromagnetic actuators 15, 16 respectively.
  • a spark plug 17 is mounted on the cylinder head 6 to open into the combustion chamber 5.
  • the spark plug 17 is connected to an ignition circuit known in itself and not shown here.
  • An injector 18 of a fuel supply device is also mounted on the cylinder head 6.
  • the engine further comprises an alternator starter
  • the alternator starter 19 connected in a manner known per se to the crankshaft 9 by a belt 20.
  • the alternator starter 19 is a device, known in itself, connected to the battery and capable of functioning as an electric motor or as an alternator. When operating as an electric motor, the alternator starter 19 is powered by the battery and provides the crankshaft 9 additional torque to rotate the crankshaft 9. The alternator starter 19 is thus used for starting the engine. When operating as an alternator, the alternator starter 19 is driven by the crankshaft 9 to recharge the battery.
  • the engine further comprises a management unit (or ECU, "Engine Control Unit") belonging to a device for controlling the operation of the engine also comprising the alternator starter 19 and the electromagnetic actuators 15, 16.
  • This management unit shown with the reference 21, is connected in particular to the injectors 18, to the electromagnetic actuators 15, 16, to the ignition circuit and to the alternator starter 19 to to send these.
  • the management unit 21, itself known, comprises for example a microprocessor 22 associated with a memory 23 containing programs executed by the microprocessor 22.
  • the management unit 21 is here also arranged to stop the engine. when the motor vehicle equipped with this engine comes to a stop and restart the engine as soon as the driver passes a speed (in the case of a sequential gearbox) or presses the accelerator (in the case of a gearbox automatic gears).
  • the device for controlling the operation of the motor comprises an additional source of power supply, such as capacitors, connected to the starter 19 and to the actuators 15, 16 for supplying them, for example, depending on the power requirement. of these.
  • the control of the power supply is for example carried out from the management unit 21.
  • the operating cycle of each of the cylinders is a four-stroke cycle comprising an admission time, a compression time, a relaxation time and an exhaust time. Each time represents a quarter cycle of operation, a half-turn of crankshaft.
  • the cycle times of each cylinder are referenced ADM for admission, COMP for compression, DET for expansion and ECH for exhaust and represent a half-turn of crankshaft.
  • A indicates ignition and "I” fuel injection.
  • the pistons are at the top dead center (“TDC") at the end of the compression and exhaust times, and at the bottom dead center at the end of the intake and expansion times.
  • TDC top dead center
  • the same time occurs for the cylinders 1, 3, 4, 2 respectively with a shift of a quarter cycle of operation. tioning.
  • the intake valve 13 is controlled to open during the admission time of the operating cycle of the cylinder
  • the exhaust valve 14 is controlled to open during the exhaust time of the operating cycle of the cylinder, the spark plug 17 is controlled to generate a spark at the end of the compression cycle,
  • the injector 18 is controlled to inject fuel during the intake phase.
  • the management unit 21 controls the temporary shutdown of the engine.
  • Stopping the heat engine (period P2) is performed for each cylinder 1, 2, 3, 4 by deactivating the injection so that the admission time will be carried out without introducing fuel into the combustion chamber 5: 1
  • the management unit 21 controls the actuator 15 which opens the intake valve 13 for the time of introducing air and then closes it. The air is then trapped in the combustion chamber 5, the exhaust valve 14 being kept closed.
  • the order of deactivation of the injection is as follows: cylinder 1, cylinder 3, cylinder 4, cylinder 2.
  • the motor stops here once the cylinder 2 has been deactivated, However, it is likely that the establishment of backpressures causes the engine to stop before.
  • the management unit 21 controls the alternator diverter so that it rotates the crankshaft. 9 while the management unit 21 controls the injection into the cylinder on admission and resume the normal cycle on the other cylinders to restart the engine.
  • the management unit 21 controls the injection into the cylinder on admission and resume the normal cycle on the other cylinders to restart the engine.
  • stopping the engine is obtained by switching off the ignition.
  • the mixture in the intake cylinder is then directly ready for use during startup.
  • the control unit 21 controls the deactivation of an engine. or two of the cylinders 1, 2, 3, 4.
  • the deactivation of one or two of the cylinders 1, 2, 3, 4 causes a balance of the crankshaft 9 which results in a succession of acceleration or deceleration of the crankshaft 9.
  • L management unit 21 then controls 1 'alternator starter 19 so that it:
  • the part of the torque taken and the additional torque to be supplied are here determined by the management unit 21 as a function of the difference between the instantaneous speed output shaft 9 and the nominal rotational speed it should have for the operating speed of the engine.
  • the alternator starter 19 thus makes it possible to compensate for the imbalance of the crankshaft 9 produced by the deactivation of one or more cylinders.
  • the memory 23 here further comprises control laws of the alternator starter 19 as a function of the cylinder or cylinders deactivated. It is possible to control the starter motor 19 either according to the speed detected by the detector 24, or according to one of the control laws stored in the memory 23. It is also possible to combine these two control modes. to optimize the imbalance compensation.
  • the invention is not limited to the embodiment described and variants can be made without departing from the scope of the invention as defined by the claims.
  • the invention is applicable to any type of engine and for example to a non-controlled ignition engine such as a diesel engine, a direct or indirect injection engine.
  • a non-controlled ignition engine such as a diesel engine, a direct or indirect injection engine.
  • the number of cylinders can be different from four.
  • valves can be immobilized in the open position or in an intermediate position during the temporary shutdown, this solving the problem of noise but not allowing the establishment of counterpressures to accelerate the stopping of the engine.

Abstract

The invention relates to a method for controlling, during a temporary stoppage, a four-stroke combustion engine comprising a block delimiting cylinders which define combustion chambers (5) which are equipped with pistons (7) into which there open an intake pipe (11) and an exhaust pipe (12) both provided with valves (13, 14) that can move between open positions and closed positions, the method comprising steps of detecting conditions of a temporary stoppage of the engine and of commanding that the exhaust valves be kept in the closed position once the engine has gone through an intake phase during the last engine cycle prior to the stoppage.

Description

Procédé de commande d'un moteur thermique lors d'un arrêt temporaire et dispositif de commande correspondant.A method of controlling a heat engine during a temporary stop and corresponding control device.
La présente invention concerne un procédé de com- mande d'un moteur thermique lors d'un arrêt temporaire et le dispositif correspondant.The present invention relates to a method for controlling a heat engine during a temporary stop and the corresponding device.
ARRIERE PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION
Un moteur thermique à quatre temps de véhicule automobile comporte généralement un bloc délimitant des cylindres définissant des chambres de combustion dans chacune desquelles est monté un piston relié à un vilebrequin relié via la boîte de vitesses à des roues du. véhicule automobile pour entraîner celles-ci en rotation. Dans chaque chambre de combustion, débouche un conduit d'admission et un conduit d'échappement pourvu de soupapes mobiles entre des positions d'ouverture et de fermeture. Les soupapes sont déplacées entre leurs deux positions par l'intermédiaire d'arbres à came entraînés par le moteur thermique. Le moteur thermique comporte égale- ment un dispositif d'alimentation des chambres de combustion en carburant et une unité de gestion du moteur reliée au dispositif d'alimentation et au circuit d'allumage dans le cas d'un moteur à allumage commandé. L'électricité utilisée à bord du véhicule est fournie par un alternateur entraîné par le moteur thermique et relié à la batterie du véhicule pour recharger celle-ci. Le démarrage du moteur est assuré par un démarreur qui est relié à la batterie et qui a un pignon de sortie engrenant sur une couronne dentée solidaire du vilebrequin. II est également connu d'utiliser un alternodé- marreur qui assure alternativement les fonctions d'alternateur et de démarreur .A four-stroke engine of a motor vehicle generally comprises a block defining cylinders defining combustion chambers in each of which is mounted a piston connected to a crankshaft connected via the gearbox to the wheels of. motor vehicle to drive them in rotation. In each combustion chamber, an intake duct and an exhaust duct are provided with valves movable between opening and closing positions. The valves are moved between their two positions via camshafts driven by the engine. The combustion engine also includes a fuel combustion chamber supplying device and an engine management unit connected to the fueling device and the ignition circuit in the case of a spark ignition engine. The electricity used in the vehicle is provided by an alternator driven by the engine and connected to the vehicle battery to recharge it. The engine is started by a starter which is connected to the battery and which has an output gear meshing on a ring gear secured to the crankshaft. It is also known to use an alternator-starter which alternately performs alternator and starter functions.
L' alternodémarreur piloté comme démarreur permet un démarrage rapide du moteur. Lorsque le moteur équipe un véhicule automobile, il est dès lors possible d'envi- sager d'arrêter temporairement le moteur à chaque fois que le véhicule s'immobilise (par exemple dans un embouteillage ou à un feu rouge) et de redémarrer le moteur dès que le conducteur signifie son intention d'avancer par exemple en passant une vitesse. Lorsque le moteur thermique est en cours d'arrêt, l'actionneur est piloté pour immobiliser les soupapes le plus rapidement possible afin de diminuer le bruit lié au déplacement des soupapes, bruit qui pourrait s'avérer incommodant lors de l'arrêt du moteur pendant lequel le niveau sonore général est relativement faible.The alternator starter controlled as starter allows a fast start of the engine. When the engine is fitted to a motor vehicle, it is therefore possible to remember to temporarily stop the engine each time the vehicle comes to a standstill (for example in a traffic jam or at a red light) and restart the engine as soon as the driver signifies his intention to advance, for example by passing a speed. When the engine is stopped, the actuator is controlled to immobilize the valves as quickly as possible to reduce the noise related to the movement of the valves, noise that could be inconvenient when stopping the engine during which the general sound level is relatively low.
Toutefois, le redémarrage fréquent du moteur pose des problèmes de recharge de la batterie et donc de di- mensionnement de celle-ci . OBJET DE L'INVENTIONHowever, the frequent restart of the engine poses problems of recharging the battery and therefore of size of the latter. OBJECT OF THE INVENTION
L'invention a pour but de fournir un procédé et un dispositif facilitant le redémarrage.The object of the invention is to provide a method and a device facilitating restarting.
RESUME DE L ' INVENTION A cet effet, on prévoit, selon l'invention, un procédé de commande lors d'un arrêt temporaire d'un moteur thermique à quatre temps comportant un bloc délimitant des cylindres définissant des chambres de combustion qui sont équipées de pistons et dans lesquelles débouchent un conduit d'admission et un conduit d'échappement pourvus de soupapes mobiles entre des positions d'ouverture et des positions de fermeture, le procédé comportant les étapes de détecter les conditions d'un arrêt temporaire du moteur et de commander un maintien des soupapes d'admission en position fermée après un passage par une phase d'admission lors d'un dernier cycle du moteur avant l'arrêt temporaire.SUMMARY OF THE INVENTION For this purpose, provision is made, according to the invention, for a control method during a temporary stop of a four-stroke thermal engine comprising a block delimiting cylinders defining combustion chambers which are equipped with pistons and into which open an intake duct and an exhaust duct provided with movable valves between the open positions and the closed positions, the method comprising the steps of detecting the conditions of a temporary stopping of the engine and of control a hold of the intake valves in the closed position after a passage through an intake phase during a last cycle of the engine before the temporary stop.
Ainsi, le cylindre à l'admission reste rempli jusqu'au redémarrage de sorte que le couple de démarrage s'applique dès le premier demi-tour de vilebrequin. De préférence, les soupapes d'échappement sont également maintenues fermées lors d'un dernier cycle moteur avant 1 ' arrêt temporaire .Thus, the intake cylinder remains filled until restart so that the starting torque is applied from the first half-turn crankshaft. Preferably, the exhaust valves are also kept closed during a last engine cycle before the temporary stop.
Ainsi, lors de l'arrêt temporaire, le cylindre qui serait normalement vide en fin de phase d'échappement se trouve rempli de gaz comprimé de sorte que lors du démarrage le moteur bénéficie d'un couple supplémentaire résultant de la détente de ce gaz .Thus, during the temporary stop, the cylinder which would normally be empty at the end of the exhaust phase is filled with compressed gas so that during start-up the engine benefits from an additional torque resulting from the expansion of this gas.
Selon un aspect avantageux de 1 ' invention en relation avec un moteur comportant une injection directe de carburant, le procédé comporte l'étape de couper l'injection lors d'une phase d'admission précédant le maintien des soupapes d'échappement dans la position fermée. On évite ainsi de rejeter dans l'atmosphère du carburant non brûlé lors du redémarrage du moteur. Selon un autre aspect de 1 ' invention, celle-ci concerne un dispositif de commande du fonctionnement d'un moteur thermique à quatre temps comportant un bloc délimitant des cylindres définissant des chambres de combustion qui sont équipées de pistons et dans lesquelles dé- bouchent un conduit d'admission et un conduit d'échappement pourvus de soupapes mobiles entre des positions d'ouverture et de fermeture, le moteur thermique comportant également un dispositif d'alimentation des chambres de combustion en carburant et au moins un actionneur électromagnétique de soupape, dans lequel une unité de gestion est configurée pour détecter des conditions d'un arrêt temporaire du moteur et commander un maintien des soupapes d'admission en position fermée après un passage par une phase d'admission lors d'un dernier cycle du mo- teur avant l'arrêt.According to an advantageous aspect of the invention in connection with an engine comprising a direct injection of fuel, the method comprises the step of cutting the injection during an intake phase preceding the holding of the exhaust valves in the position. closed. This avoids the release of unburned fuel into the atmosphere when the engine is restarted. According to another aspect of the invention, this relates to a device for controlling the operation of a four-stroke thermal engine comprising a block delimiting cylinders defining combustion chambers which are equipped with pistons and in which a piston intake duct and an exhaust duct provided with valves movable between open and closed positions, the combustion engine also comprising a device for supplying the combustion chambers with fuel and at least one electromagnetic valve actuator, in wherein a management unit is configured to detect conditions of a temporary stopping of the engine and to command a hold of the intake valves in the closed position after a passage through an intake phase during a last cycle of the front engine shutdown.
Selon un mode de réalisation particulier, le dispositif d'alimentation comprend un organe d'injection par chambre de combustion et l'unité de gestion est agencée pour arrêter temporairement le moteur en commandant suc- cessivement dans les chambres de combustion un arrêt de l'organe d'injection et une immobilisation de la soupape commandée par 1 ' actionneur .According to a particular embodiment, the feed device comprises a combustion chamber injection member and the management unit is arranged to temporarily stop the engine by successively controlling in the combustion chambers a shutdown of the combustion chamber. the injection member and an immobilization of the valve controlled by one actuator.
Le maintien des soupapes en position de fermeture engendre, dans les chambres de combustion, l'établisse- ment de contre-pressions qui s'opposent aux mouvements des pistons et vont donc accélérer l'arrêt du moteur. En outre, l'immobilisation de la soupape d'admission en position de fermeture à la fin d'une phase d'admission permet de conserver des gaz frais dans les cylindres, faci- Iitant ainsi le redémarrage du moteur.Maintaining the valves in the closed position generates, in the combustion chambers, the establishment of counterpressures which oppose the movements of the pistons and thus accelerate the stopping of the engine. In addition, the immobilization of the intake valve in the closed position at the end of an intake phase makes it possible to keep fresh gases in the cylinders, thus making it easier to restart the engine.
D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit d'un mode de réalisation particulier non limitatif de 1 ' invention . BREVE DESCRIPTION DES DESSINSOther characteristics and advantages of the invention will emerge on reading the following description of a particular non-limiting embodiment of the invention. BRIEF DESCRIPTION OF THE DRAWINGS
II sera fait référence aux dessins annexés, parmi lesquels :Reference will be made to the appended drawings, among which:
- la figure 1 est une vue schématique en perspective d'un moteur thermique incorporant un dispositif de commande conforme à l'invention,FIG. 1 is a schematic perspective view of a heat engine incorporating a control device according to the invention,
- la figure 2 est une vue schématique partielle en coupe transversale de ce moteur,FIG. 2 is a partial schematic cross-sectional view of this motor,
- la figure 3 est un diagramme montrant schémati- quement les cycles de fonctionnement du moteur en fonc- tion du temps.FIG. 3 is a diagram schematically showing the operating cycles of the motor as a function of time.
DESCRIPTION DETAILLEE DE L'INVENTION En référence aux figures, le moteur thermique comporte un bloc 10 délimitant quatre cylindres 1, 2, 3, 4 en ligne. Les cylindres 1 et 4 encadrent les cylindres 2 et 3. Chaque cylindre 1, 2, 3, 4 définit une chambre 5 fermée d'un côté par une culasse 6 et de l'autre côté par un piston 7 mobile à coulissement dans le cylindre 1, 2, 3, 4 entre deux positions extrêmes (point mort haut et point mort bas) et reliée par une bielle 8 à un vilebre- quin 9 monté à pivotement dans le bloc 10. Dans chaque chambre de combustion 5, débouchent un conduit d'admission 11 et un conduit d'échappement 12 qui sont ménagés dans la culasse 6. Le conduit d'admission 11 et le conduit d'échappement 12 sont équipés res- pectivement d'une soupape d'admission 13 et d'une soupape d'échappement 14 déplacées entre deux positions d'ouverture et de fermeture par des actionneurs électromagnétiques 15, 16 respectivement.DETAILED DESCRIPTION OF THE INVENTION With reference to the figures, the heat engine comprises a block 10 delimiting four cylinders 1, 2, 3, 4 in line. The cylinders 1 and 4 frame the cylinders 2 and 3. Each cylinder 1, 2, 3, 4 defines a chamber 5 closed on one side by a cylinder head 6 and on the other side by a piston 7 movable to slide in the cylinder 1, 2, 3, 4 between two extreme positions (top dead center and bottom dead center) and connected by a rod 8 to a crankshaft 9 pivotally mounted in the block 10. In each combustion chamber 5 open an intake duct 11 and an exhaust duct 12 which are formed in the cylinder head 6. The intake duct 11 and the exhaust duct 12 are each equipped with a intake valve 13 and an exhaust valve 14 moved between two open and closed positions by electromagnetic actuators 15, 16 respectively.
Une bougie 17 est montée sur la culasse 6 pour déboucher dans la chambre de combustion 5. La bougie 17 est reliée à un circuit d'allumage connu en lui-même et non représenté ici .A spark plug 17 is mounted on the cylinder head 6 to open into the combustion chamber 5. The spark plug 17 is connected to an ignition circuit known in itself and not shown here.
Un injecteur 18 d'un dispositif d'alimentation en carburant est monté également sur la culasse 6. Le moteur comprend en outre un alternodémarreurAn injector 18 of a fuel supply device is also mounted on the cylinder head 6. The engine further comprises an alternator starter
19 relié de façon connue en elle-même au vilebrequin 9 par une courroie 20. L 'alternodémarreur 19 est un dispositif, connu en lui-même, relié à la batterie et susceptible de fonctionner comme un moteur électrique ou comme un alternateur. Lorsqu'il fonctionne comme un moteur électrique, 1 ' alternodémarreur 19 est alimenté par la batterie et fournit au vilebrequin 9 un couple additionnel pour entraîner en rotation le vilebrequin 9. L 'alternodémarreur 19 est ainsi utilisé pour le démarrage du mo- teur thermique. Lorsqu'il fonctionne comme un alternateur, 1 ' alternodémarreur 19 est entraîné par le vilebrequin 9 pour recharger la batterie.19 connected in a manner known per se to the crankshaft 9 by a belt 20. The alternator starter 19 is a device, known in itself, connected to the battery and capable of functioning as an electric motor or as an alternator. When operating as an electric motor, the alternator starter 19 is powered by the battery and provides the crankshaft 9 additional torque to rotate the crankshaft 9. The alternator starter 19 is thus used for starting the engine. When operating as an alternator, the alternator starter 19 is driven by the crankshaft 9 to recharge the battery.
Le moteur comprend en outre une unité de gestion (ou ECU, "Engine Control Unit") appartenant à un disposi- tif de commande du fonctionnement du moteur comprenant également 1 ' alternodémarreur 19 et les actionneurs électromagnétiques 15, 16. Cette unité de gestion, représentée avec la référence 21, est reliée notamment aux injec- teurs 18, aux actionneurs électromagnétiques 15, 16, au circuit d'allumage et à l ' alternodémarreur 19 pour com- mander ceux-ci. L'unité de gestion 21, connue en elle- même, comprend par exemple un microprocesseur 22 associé à une mémoire 23 contenant des programmes exécutés par le microprocesseur 22. L'unité de gestion 21 est ici égale- ment agencée pour arrêter le moteur thermique lorsque le véhicule automobile équipé de ce moteur s'immobilise et pour redémarrer celui-ci dès que le conducteur passe une vitesse (dans le cas d'une boîte de vitesses séquentielle) ou appuie sur l'accélérateur (dans le cas d'une boîte de vitesses automatique) .The engine further comprises a management unit (or ECU, "Engine Control Unit") belonging to a device for controlling the operation of the engine also comprising the alternator starter 19 and the electromagnetic actuators 15, 16. This management unit, shown with the reference 21, is connected in particular to the injectors 18, to the electromagnetic actuators 15, 16, to the ignition circuit and to the alternator starter 19 to to send these. The management unit 21, itself known, comprises for example a microprocessor 22 associated with a memory 23 containing programs executed by the microprocessor 22. The management unit 21 is here also arranged to stop the engine. when the motor vehicle equipped with this engine comes to a stop and restart the engine as soon as the driver passes a speed (in the case of a sequential gearbox) or presses the accelerator (in the case of a gearbox automatic gears).
De préférence, le dispositif de commande du fonctionnement du moteur comprend une source additionnelle d'alimentation en énergie, comme des condensateurs, reliée à 1 ' aiternodémarrage 19 et aux actionneurs 15, 16 pour alimenter ceux-ci par exemple en fonction du besoin en puissance de ceux-ci. La commande de l'alimentation est par exemple effectuée à partir de l'unité de gestion 21.Preferably, the device for controlling the operation of the motor comprises an additional source of power supply, such as capacitors, connected to the starter 19 and to the actuators 15, 16 for supplying them, for example, depending on the power requirement. of these. The control of the power supply is for example carried out from the management unit 21.
De façon connue en soi, le cycle de fonctionne- ment de chacun des cylindres est un cycle à quatre temps comportant un temps d'admission, un temps de compression, un temps de détente et un temps d'échappement. Chaque temps représente un quart de cycle de fonctionnement, soit un demi-tour de vilebrequin. En référence à la figure 3, les temps des cycles de chaque cylindre sont référencés ADM pour admission, COMP pour compression, DET pour détente et ECH pour échappement et représentent un demi-tour de vilebrequin. "A" indique l'allumage et "I" l'injection du carburant. De façon connue en soi, les pistons se trouvent au point mort haut ("PMH") à la fin des temps de compression et d'échappement, et au point mort bas à la fin des temps d'admission et de détente. De façon connue en soi, le même temps intervient pour les cylindres 1, 3, 4, 2 res- pectivement avec un décalage d'un quart de cycle de fonc- tionnement .In a manner known per se, the operating cycle of each of the cylinders is a four-stroke cycle comprising an admission time, a compression time, a relaxation time and an exhaust time. Each time represents a quarter cycle of operation, a half-turn of crankshaft. With reference to FIG. 3, the cycle times of each cylinder are referenced ADM for admission, COMP for compression, DET for expansion and ECH for exhaust and represent a half-turn of crankshaft. "A" indicates ignition and "I" fuel injection. In known manner, the pistons are at the top dead center ("TDC") at the end of the compression and exhaust times, and at the bottom dead center at the end of the intake and expansion times. In a manner known per se, the same time occurs for the cylinders 1, 3, 4, 2 respectively with a shift of a quarter cycle of operation. tioning.
En mode de fonctionnement normal (période Pl sur la figure 3), pour chaque cylindre 1, 2, 3, 4 :In normal operating mode (period P1 in FIG. 3), for each cylinder 1, 2, 3, 4:
- la soupape d'admission 13 est commandée pour s'ouvrir pendant le temps d'admission du cycle de fonctionnement du cylindre,the intake valve 13 is controlled to open during the admission time of the operating cycle of the cylinder,
- la soupape d'échappement 14 est commandée pour s'ouvrir pendant le temps d'échappement du cycle de fonctionnement du cylindre, - la bougie 17 est commandée pour générer une étincelle à la fin du cycle de compression,the exhaust valve 14 is controlled to open during the exhaust time of the operating cycle of the cylinder, the spark plug 17 is controlled to generate a spark at the end of the compression cycle,
- l'injecteur 18 est commandé pour injecter du carburant pendant la phase d'admission.the injector 18 is controlled to inject fuel during the intake phase.
Lorsque le conducteur commande un ralentissement du véhicule jusqu'à l'immobilisation de celui-ci sans couper le contact, l'unité de gestion 21 commande l'arrêt temporaire du moteur thermique .When the driver controls a slowdown of the vehicle until the immobilization thereof without turning off the ignition, the management unit 21 controls the temporary shutdown of the engine.
L'arrêt du moteur thermique (période P2 ) est réalisé pour chaque cylindre 1, 2, 3, 4 en désactivant l'injection de sorte que le temps d'admission va être effectué sans introduire de carburant dans la chambre de combustion 5 : l'unité de gestion 21 commande l'action- neur 15 qui ouvre la soupape d'admission 13 le temps d'introduire de l'air puis la referme. L'air est alors emprisonné dans la chambre de combustion 5, la soupape d'échappement 14 étant maintenue fermée. L'ordre de dé- sactivation de l'injection est le suivant : cylindre 1, cylindre 3, cylindre 4, cylindre 2. Pour les besoins de l'explication, le moteur s'arrête ici une fois le cylin- dre 2 désactivé, il est toutefois probable que l'établissement des contre-pressions provoque l'arrêt du moteur avant .Stopping the heat engine (period P2) is performed for each cylinder 1, 2, 3, 4 by deactivating the injection so that the admission time will be carried out without introducing fuel into the combustion chamber 5: 1 The management unit 21 controls the actuator 15 which opens the intake valve 13 for the time of introducing air and then closes it. The air is then trapped in the combustion chamber 5, the exhaust valve 14 being kept closed. The order of deactivation of the injection is as follows: cylinder 1, cylinder 3, cylinder 4, cylinder 2. For the sake of explanation, the motor stops here once the cylinder 2 has been deactivated, However, it is likely that the establishment of backpressures causes the engine to stop before.
Lorsque le conducteur passe une vitesse pour avancer, l'unité de gestion 21 commande 1 'alternodémar- reur pour que celui-ci entraîne en rotation le vilebre- quin 9 tandis que l'unité de gestion 21 commande l'injection dans le cylindre à l'admission et reprend le cycle normal sur les autres cylindres pour redémarrer le moteur. Dans le cas d'un moteur dans lequel le mélange air/carburant est effectué en amont de la soupape d'admission, l'arrêt du moteur est obtenu en coupant l'allumage. Le mélange dans le cylindre à l'admission est alors directement prêt à 1 ' emploi lors du démarrage . Une autre fonctionnalité possible avec le moteur thermique de l'invention va maintenant être décrite.When the driver passes a speed to advance, the management unit 21 controls the alternator diverter so that it rotates the crankshaft. 9 while the management unit 21 controls the injection into the cylinder on admission and resume the normal cycle on the other cylinders to restart the engine. In the case of an engine in which the air / fuel mixture is made upstream of the intake valve, stopping the engine is obtained by switching off the ignition. The mixture in the intake cylinder is then directly ready for use during startup. Another possible functionality with the heat engine of the invention will now be described.
Lorsque le moteur est soumis à une charge constante (c'est-à-dire que le régime du moteur thermique est constant et le vilebrequin 9 tourne à une vitesse nomi- nale) , l'unité de gestion 21 commande la désactivation d'un ou deux des cylindres 1, 2, 3, 4. La désactivation d'un ou de deux des cylindres 1, 2, 3, 4 engendre un dé- séquilibrage du vilebrequin 9 qui se traduit en une succession d'accélération ou de décélération du vilebrequin 9. Un détecteur 24, monté sur le bloc 10 pour détecter la vitesse instantanée du vilebrequin 9 et relié à l'unité de gestion 21, transmet à l'unité de gestion 21 un signal représentatif de la vitesse instantanée du vilebrequin 9. L'unité de gestion 21 commande alors 1 ' alternodémarreur 19 de manière que celui-ci :When the engine is subjected to a constant load (i.e., the engine speed is constant and the crankshaft 9 rotates at a nominal speed), the control unit 21 controls the deactivation of an engine. or two of the cylinders 1, 2, 3, 4. The deactivation of one or two of the cylinders 1, 2, 3, 4 causes a balance of the crankshaft 9 which results in a succession of acceleration or deceleration of the crankshaft 9. A detector 24, mounted on the block 10 to detect the instantaneous speed of the crankshaft 9 and connected to the management unit 21, transmits to the management unit 21 a signal representative of the instantaneous speed of the crankshaft 9. L management unit 21 then controls 1 'alternator starter 19 so that it:
- prélève une part de couple plus importante sur le vilebrequin 9 lorsque le vilebrequin 9 accélère pour ramener le vilebrequin 9 à sa vitesse nominale,- takes a greater share of torque on the crankshaft 9 when the crankshaft 9 accelerates to bring the crankshaft 9 to its nominal speed,
- prélève une part de couple moins importante ou fournisse un couple additionnel lorsque le vilebrequin 9 décélère pour ramener le vilebrequin 9 à sa vitesse nominale.- Take a smaller torque or provide additional torque when the crankshaft 9 decelerates to bring the crankshaft 9 to its nominal speed.
La part de couple prélevée et le couple additionnel à fournir sont ici déterminés par l'unité de gestion 21 en fonction de la différence entre la vitesse instan- tanée de l'arbre de sortie 9 et la vitesse de rotation nominale que celui-ci devrait avoir pour le régime de fonctionnement du moteur.The part of the torque taken and the additional torque to be supplied are here determined by the management unit 21 as a function of the difference between the instantaneous speed output shaft 9 and the nominal rotational speed it should have for the operating speed of the engine.
L ' alternodémarreur 19 permet ainsi de compenser le déséquilibrage du vilebrequin 9 produit par la désac- tivation d'un ou plusieurs cylindres.The alternator starter 19 thus makes it possible to compensate for the imbalance of the crankshaft 9 produced by the deactivation of one or more cylinders.
La mémoire 23 comporte ici en outre des lois de commande de 1 ' alternodémarreur 19 en fonction du ou des cylindres désactivés. Il est possible de commander l'al- ternodémarreur 19 soit en fonction de la vitesse détectée par le détecteur 24, soit en fonction d'une des lois de commande mémorisée dans la mémoire 23. Il est également possible de combiner ces deux modes de commandes en vue d'optimiser la compensation du déséquilibrage. Bien entendu, l'invention n'est pas limitée au mode de réalisation décrit et on peut y apporter des variantes de réalisation sans sortir du cadre de 1 ' invention tel que défini par les revendications.The memory 23 here further comprises control laws of the alternator starter 19 as a function of the cylinder or cylinders deactivated. It is possible to control the starter motor 19 either according to the speed detected by the detector 24, or according to one of the control laws stored in the memory 23. It is also possible to combine these two control modes. to optimize the imbalance compensation. Of course, the invention is not limited to the embodiment described and variants can be made without departing from the scope of the invention as defined by the claims.
En particulier, l'invention est applicable à tout type de moteur et par exemple à un moteur à allumage non commandé comme un moteur diesel, un moteur à injection directe ou indirecte. Le nombre de cylindres peut être différent de quatre.In particular, the invention is applicable to any type of engine and for example to a non-controlled ignition engine such as a diesel engine, a direct or indirect injection engine. The number of cylinders can be different from four.
Les soupapes peuvent être immobilisées en posi- tion ouverte ou dans une position intermédiaire lors de l'arrêt temporaire, ceci résolvant le problème du bruit mais ne permettant toutefois pas d'établir des contre- pressions pour accélérer l'arrêt du moteur.The valves can be immobilized in the open position or in an intermediate position during the temporary shutdown, this solving the problem of noise but not allowing the establishment of counterpressures to accelerate the stopping of the engine.
Bien que l'invention ait été décrite en relation avec un moteur dont toutes les soupapes peuvent être commandées individuellement par un actionneur électromagnétique, l'invention s'applique également à un moteur équipé d'un actionneur permettant une désactivation partielle seulement . Although the invention has been described in connection with an engine in which all the valves can be controlled individually by an electromagnetic actuator, the invention also applies to a motor equipped with an actuator allowing partial deactivation only.

Claims

REVENDICATIONS
1. Procédé de commande lors d'un arrêt temporaire d'un moteur thermique à quatre temps comportant un bloc délimitant des cylindres définissant des chambres de combustion (5) qui sont équipées de pistons (7) et dans lesquelles débouchent un conduit d'admission (11) et un conduit d'échappement (12) pourvus de soupapes (13, 14) mobiles entre des positions d'ouverture et des positions de fermeture, caractérisé en ce que le procédé comporte les étapes de détecter des conditions d'un arrêt temporaire du moteur et de commander un maintien des soupapes d'admission en position fermée après un passage par une phase d'admission lors d'un dernier cycle du moteur avant l'arrêt.1. Control method during a temporary stop of a four-stroke thermal engine comprising a block defining cylinders defining combustion chambers (5) which are equipped with pistons (7) and into which open an intake duct (11) and an exhaust duct (12) provided with valves (13, 14) movable between open and closed positions, characterized in that the method comprises the steps of detecting conditions of a shutdown temporary engine and control a hold of the intake valves in the closed position after a passage through an intake phase during a last cycle of the engine before stopping.
2. Procédé selon la revendication 1, caractérisé en ce que les soupapes d'échappement sont également maintenues fermées lors du dernier cycle du moteur avant l'arrêt. 2. Method according to claim 1, characterized in that the exhaust valves are also kept closed during the last cycle of the engine before stopping.
3. Procédé selon la revendication 1, en relation avec un moteur comportant une injection directe de carburant, caractérisé en ce qu'il comporte l'étape de couper l'injection lors d'une phase d'admission précédant le maintien des soupapes d'échappement en position fermée. 3. Method according to claim 1, in connection with a motor comprising a direct injection of fuel, characterized in that it comprises the step of cutting the injection during an intake phase preceding the maintenance of the valves. exhaust in closed position.
4. Dispositif de commande d'un moteur thermique à quatre temps comportant un bloc (10) délimitant des cylindres définissant des chambres de combustion (5) qui sont équipées de pistons (7) et dans lesquelles débouchent un conduit d'admission (11) et un conduit d'échap- pement (12) pourvus de soupapes (13, 14) mobiles entre des positions d'ouverture et des positions de fermeture, le moteur thermique comportant également un dispositif d'alimentation des chambres de combustion en carburant et au moins un actionneur électromagnétique de soupape, ca- ractérisé en ce qu'il comporte une unité de gestion (21) configurée pour détecter des conditions d'un arrêt temporaire du moteur et commander un maintien des soupapes d'admission et des soupapes d'échappement en position fermée après un passage par une phase d'admission lors d'un dernier cycle du moteur avant l'arrêt.4. Control device for a four-stroke thermal engine comprising a block (10) delimiting cylinders defining combustion chambers (5) which are equipped with pistons (7) and into which an intake duct (11) opens and an exhaust duct (12) provided with valves (13, 14) movable between open and closed positions, the combustion engine also having a combustion chamber supply device and less an electromagnetic valve actuator, characterized in that it comprises a management unit (21) configured to detect conditions of a temporary stopping of the engine and to command a hold of the intake valves and the exhaust valves in the closed position after a passage through an intake phase during a last cycle of the engine before the stop.
5. Dispositif selon la revendication 4, dans lequel, le dispositif d'alimentation comprenant un organe d'injection (19) par chambre de combustion (5), l'unité de gestion (21) est agencée pour arrêter temporairement le moteur en commandant successivement dans les chambres de combustion un arrêt de l'organe d'injection et une immobilisation de la soupape (13, 14) commandée par l'ac- tionneur .5. Device according to claim 4, wherein, the feed device comprising an injection member (19) by combustion chamber (5), the management unit (21) is arranged to temporarily stop the engine by controlling successively in the combustion chambers a stop of the injection member and an immobilization of the valve (13, 14) controlled by the actuator.
6. Dispositif selon la revendication 4, compre- nant un actionneur (16) électromagnétique commandant chaque soupape d'échappement (14), l'unité de gestion (21) étant agencée pour commander ledit actionneur en position de fermeture lors de l'arrêt temporaire du moteur.6. Device according to claim 4, com- prizing an electromagnetic actuator (16) controlling each exhaust valve (14), the management unit (21) being arranged to control said actuator in the closed position during the shutdown. temporary engine.
7. Dispositif selon la revendication 4, dans Ie- quel le bloc (10) délimitant des première, deuxième, troisième et quatrième chambres de combustion (1, 2, 3, 4) , la première et la quatrième chambre de combustion (1, 4) encadrant les deuxième et troisième chambres de combustion (2, 3), l'unité de gestion (21) est agencée pour commander l'arrêt de l'injection et l'immobilisation des soupapes . 7. Device according to claim 4, in which the block (10) delimiting first, second, third and fourth combustion chambers (1, 2, 3, 4), the first and the fourth combustion chamber (1, 4) flanking the second and third combustion chambers (2, 3), the management unit (21) is arranged to control the stop of the injection and the immobilization of the valves.
EP07823332A 2006-07-25 2007-07-25 Method for controlling a combustion engine during a temporary stoppage and corresponding control device Withdrawn EP2044311A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0606798A FR2904371B1 (en) 2006-07-25 2006-07-25 DEVICE FOR MONITORING THE OPERATION OF AN ENGINE ASSOCIATED WITH AN ELECTROMAGNETIC ACTUATOR OF VALVES AND AN ALTERNATOR STARTER
PCT/FR2007/001274 WO2008012431A2 (en) 2006-07-25 2007-07-25 Method and device for controlling a combustion engine during a temporary stoppage

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EP2044311A2 true EP2044311A2 (en) 2009-04-08

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EP (1) EP2044311A2 (en)
JP (1) JP5086346B2 (en)
FR (1) FR2904371B1 (en)
WO (1) WO2008012431A2 (en)

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KR20110047202A (en) * 2008-07-30 2011-05-06 발레오 시스템므 드 꽁트롤르 모뙤르 Control units for one or more electromagnetic actuators of heat engine valves, and various assemblies of such control units and electromagnetic actuators
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US20090287399A1 (en) 2009-11-19
FR2904371B1 (en) 2012-08-31
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US8155864B2 (en) 2012-04-10
JP2009544890A (en) 2009-12-17
WO2008012431A3 (en) 2008-03-13
WO2008012431A2 (en) 2008-01-31

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