EP2307674A1 - Control unit for one or more electromagnetic actuators of a heat engine valve, and different assemblies of such control units and such electromagnetic actuators - Google Patents

Control unit for one or more electromagnetic actuators of a heat engine valve, and different assemblies of such control units and such electromagnetic actuators

Info

Publication number
EP2307674A1
EP2307674A1 EP08875608A EP08875608A EP2307674A1 EP 2307674 A1 EP2307674 A1 EP 2307674A1 EP 08875608 A EP08875608 A EP 08875608A EP 08875608 A EP08875608 A EP 08875608A EP 2307674 A1 EP2307674 A1 EP 2307674A1
Authority
EP
European Patent Office
Prior art keywords
control unit
actuators
control
electromagnetic actuators
palliative
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Withdrawn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
EP08875608A
Other languages
German (de)
French (fr)
Inventor
Nicolas Gelez
Ronan Danioux
Boris Bouchez
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 EP2307674A1 publication Critical patent/EP2307674A1/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Withdrawn legal-status Critical Current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
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • 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
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
    • 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
    • F01L2800/12—Fail safe operation
    • 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
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/023—Temperature of lubricating oil or working fluid
    • 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
    • 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

Definitions

  • a control unit of one or more electromagnetic valve actuators of a heat engine and different sets of such control units and such electromagnetic actuators.
  • the present invention relates to a control unit of one or more electromagnetic valve actuators of a heat engine, such as those used to move motor vehicles. It also relates to different sets of such control units and such electromagnetic actuators.
  • a heat engine generally comprises cylinders which define combustion chambers closed on one side by a cylinder head and on the other by an alternating piston connected to a crankshaft.
  • the engine comprises fuel intake ducts in the combustion chambers and flue gas exhaust ducts, these ducts being respectively equipped with intake valves and exhaust valves.
  • the intake and exhaust valves are actuated to obtain a four-cycle engine operating cycle, namely for each combustion chamber, an intake phase in which air and fuel are introduced into the combustion chamber. combustion, a compression phase of the mixture of air and fuel, an expansion phase in which the burnt gases resulting from the combustion of the mixture relax and an exhaust phase in which the flue gases are discharged out of the chamber of combustion, successive phases in each cylinder on two turns of crankshaft.
  • each valve it is known to use an electromagnetic valve actuator piloted by a control unit connected by connecting means to a main engine management unit of the engine, namely the engine control unit or ECU (English Engine Control Unit) which has in memory of several cartographies in function for example of the outside temperature, the engine load, driving modes ...
  • the control unit acts under the effect of a control program to control the electromagnetic actuator according to a signal of piloting transmitted by the main management unit via the means of liaison.
  • the control signal determines opening and closing angles in a cycle of 720 ° of the crankshaft after a top dead center reference of the piston of the cylinder concerned, and also the water temperature, the oil temperature, the speed engine...
  • This system makes it possible to obtain better performances for the engine.
  • the control unit can not control the actuator, thus causing a stop of the engine.
  • a control unit of one or more electromagnetic actuators of the engine valve said control unit being adapted to be connected by connecting means to a main management unit of the heat engine, the control unit acting under the effect of at least a first control program for controlling the actuator (s) as a function of a signal transmitted to the control unit by the main management unit via the connecting means.
  • the control unit comprises a memory containing palliative information and, in case of interruption of the signal, the control unit implements a second control program for controlling the actuators or actuators as a function of the palliative information.
  • control unit can continue to drive the actuator thus allowing the vehicle to operate and for example to win a garage for a repair.
  • the actuator then behaves in fact like a conventional camshaft providing control of the actuator according to a fixed control profile.
  • the palliative information comprises the opening and closing angles of the valve as a function of a speed of the heat engine.
  • Said control unit may comprise an internal processing unit making it possible to convert a valve opening / closing order into an electric current, said primary, said instruction depending on said signal transmitted to the control unit by the main unit or in case of interruption of the signal, said palliative information.
  • Said control unit operates permanently, for example, either in slave mode with respect to the main management unit, or in stand-alone mode, in the event of signal interruption.
  • the unit may further comprise a voltage converter, able to deliver to said actuator (s) a secondary current whose value of the voltage depends on the voltage value of said primary current.
  • the invention also relates to a set of pairs consisting of a said control unit as described above and a said electromagnetic actuator controlled by said control unit.
  • said set comprises means for synchronizing the control units of said pairs.
  • the invention further relates to an assembly of a unit control unit as described above and said electromagnetic actuators, controlled by said control unit.
  • said control unit of said set is provided remote from said actuators.
  • FIG. 1 is a schematic perspective view of a heat engine according to the invention
  • FIG. 2 is a partial schematic cross sectional view of this engine.
  • the heat engine comprises a block 10 defining four cylinders 1, 2, 3, 4 in line.
  • 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 respectively equipped with a gas valve.
  • intake 13 and an exhaust valve 14 moved between two open and closed positions by electromagnetic actuators 15, 16 respectively.
  • Each electromagnetic actuator 15, 16 is controlled by a control unit symbolized at 19, 20. In in another embodiment, such actuators may be provided only at the inlet or only at the exhaust.
  • 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 a main management unit (or ECU, "Engine Control Unit”).
  • This main management unit represented with the reference 21, is connected in particular to the injectors 18, the electromagnetic actuators 15, 16, and the ignition circuit for controlling them.
  • the management unit 21, itself known, comprises, for example, a processing module 22 or calculation module such as a processor associated with a memory 23 containing programs executed by the processing module 22.
  • each of the cylinders is a four-stroke cycle comprising an intake phase (or time), a compression phase, an expansion phase and an exhaust phase.
  • Each phase represents a quarter cycle of operation, ie a half-turn of crankshaft.
  • the management unit 21, which is connected by connecting means 24, 25 to the control units 19, 20 of the electromagnetic actuators 15, 16, transmits to the control units 19, 20 a signal which determines angles of opening and closing of the concerned valve on a cycle of 720 °, the water and oil temperatures, a reference top of a top dead center ... to allow the control units 19 , 20 to control the electromagnetic actuators 15, 16 according to the information contained in the received signal.
  • control unit comprises a memory 26, 27 containing palliative information including, in particular, angles of opening and closing of the valve as a function of the engine speed.
  • the control unit 19, 20 executes a specific control program in using the palliative information contained in the memories 26, 27.
  • the palliative information makes it possible to drive the actuators in a profile corresponding to a standard pipe, that is to say resulting from a compromise between fuel consumption and performances.
  • the control unit is an intelligent unit, always active, operating, for example, either in slave mode relative to the main management unit, or in standalone, in case of interruption of the signal.
  • Said control unit further comprising, for example, an internal processing unit for converting a valve opening / closing command, into an electrical current, said primary, said current depending on said signal transmitted to the control unit by the main unit or, in case of interruption of the signal, said palliative information.
  • Said control unit may also include, a voltage converter, capable of delivering to said one or more actuators a secondary current whose value of the voltage depends on the voltage value of said primary current.
  • Said control unit may, according to a first example, not shown, be the same for all the actuators. It is provided remotely and connected by an electrical connection, for currents intended to feed a coil of an electromagnet, to each of the actuators.
  • Synchronization means are provided to ensure the desired mode of operation of the engine on all the cylinders, for example by relating the internal processing units of each of said control units which can thus be timed relative to each other.
  • palliative information can be directed to a driving profile of the actuator corresponding to a sporty driving, that is to say, optimized to prioritize engine performance.
  • the memory 26, 27 may contain several control programs and different palliative information.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a control unit (19, 20) for one or more electromagnetic actuators (15, 16) of the valve (13, 14) of a heat engine, wherein said control unit can be connected by linking means (24, 25) to a main management unit (21) of the heat engine, the control unit (19, 20) acting under the action of at least a first driving program for driving the actuator based on a signal transmitted to the control unit by the main management unit via the linking means. According to the invention, the control unit includes a memory (26, 27) containing backup information and, in the case of a signal interruption, the control unit runs a second driving program for driving the actuator based on workaround information. The invention also relates to different assemblies of such control units and such electromagnetic actuators.

Description

Unité de commande d'un ou plusieurs actionneurs électromagnétiques de soupape de moteur thermique, et différents ensembles de telles unités de commande et de tels actionneurs électromagnétiques. A control unit of one or more electromagnetic valve actuators of a heat engine, and different sets of such control units and such electromagnetic actuators.
La présente invention concerne une unité de commande d'un ou plusieurs actionneurs électromagnétiques de soupape de moteur thermique, tels que ceux utilisés pour mouvoir les véhicules automobiles. Elle concerne aussi différents ensembles de telles unités de commande et de tels actionneurs électromagnétiques.The present invention relates to a control unit of one or more electromagnetic valve actuators of a heat engine, such as those used to move motor vehicles. It also relates to different sets of such control units and such electromagnetic actuators.
ARRIERE PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION
Un moteur thermique comprend généralement des cylindres qui définissent des chambres de combustion fermées d'un côté par une culasse et de l'autre par un piston alternatif relié à un vilebrequin. Le moteur comprend des conduits d'admission de combustible dans les chambres de combustion et des conduits d'échappement des gaz brûlés, ces conduits étant respectivement équipés de soupapes d'admission et de soupapes d'échappement. Les soupapes d'admission et d'échappement sont actionnées pour obtenir un cycle de fonctionnement du moteur à quatre temps, à savoir pour chaque chambre de combustion, une phase d'admission dans laquelle l'air et le carburant sont introduits dans la chambre de combustion, une phase de compression du mélange d'air et de carburant , une phase de détente dans laquelle les gaz brûlés résultant de la combustion du mélange se détendent et une phase d'échappement dans laquelle les gaz brûlés sont évacués hors de la chambre de combustion, phases qui se succèdent dans chaque cylindre sur deux tours de vilebrequin .A heat engine generally comprises cylinders which define combustion chambers closed on one side by a cylinder head and on the other by an alternating piston connected to a crankshaft. The engine comprises fuel intake ducts in the combustion chambers and flue gas exhaust ducts, these ducts being respectively equipped with intake valves and exhaust valves. The intake and exhaust valves are actuated to obtain a four-cycle engine operating cycle, namely for each combustion chamber, an intake phase in which air and fuel are introduced into the combustion chamber. combustion, a compression phase of the mixture of air and fuel, an expansion phase in which the burnt gases resulting from the combustion of the mixture relax and an exhaust phase in which the flue gases are discharged out of the chamber of combustion, successive phases in each cylinder on two turns of crankshaft.
Pour actionner chaque soupape, il est connu de recourir à un actionneur électromagnétique de soupape piloté par une unité de commande reliée par des moyens de liaison à une unité principale de gestion du moteur thermique, à savoir l'unité de contrôle moteur ou ECU (de l'anglais "Engine Control Unit") qui dispose en mémoire de plusieurs cartographies en fonction par exemple de la température extérieure, de la charge du moteur, de modes de conduite... L'unité de commande agit sous l'effet d'un programme de pilotage pour piloter l'actionneur électromagnétique en fonction d'un signal de pilotage transmis par l'unité principale de gestion via les moyens de liaison. Le signal de pilotage détermine des angles d'ouverture et de fermeture dans un cycle de 720° du vilebrequin après un point mort haut de référence du piston du cylindre concerné, et également la température d'eau, la température d'huile, le régime moteur...To actuate each valve, it is known to use an electromagnetic valve actuator piloted by a control unit connected by connecting means to a main engine management unit of the engine, namely the engine control unit or ECU (English Engine Control Unit) which has in memory of several cartographies in function for example of the outside temperature, the engine load, driving modes ... The control unit acts under the effect of a control program to control the electromagnetic actuator according to a signal of piloting transmitted by the main management unit via the means of liaison. The control signal determines opening and closing angles in a cycle of 720 ° of the crankshaft after a top dead center reference of the piston of the cylinder concerned, and also the water temperature, the oil temperature, the speed engine...
Ce système permet l'obtention de meilleures performances pour le moteur. Toutefois, en cas d'absence de signal provenant de l'unité principale de gestion, par exemple en raison d'une rupture de la liaison entre l'unité principale de gestion et l'unité de commande, l'unité de commande ne peut piloter l'actionneur, engendrant ainsi un arrêt du moteur thermique.This system makes it possible to obtain better performances for the engine. However, if there is no signal from the main management unit, for example due to a break in the link between the main management unit and the control unit, the control unit can not control the actuator, thus causing a stop of the engine.
OBJET DE L'INVENTIONOBJECT OF THE INVENTION
II serait donc intéressant de disposer d'un moyen permettant d'améliorer la fiabilité du moteur thermique.It would therefore be advantageous to have a means to improve the reliability of the engine.
RESUME DE L'INVENTIONSUMMARY OF THE INVENTION
A cet effet, on' prévoit, selon l'invention, une unité de commande d'un ou plusieurs actionneurs électromagnétiques de soupape de moteur thermique, ladite unité de commande étant apte à être reliée par des moyens de liaison à une unité principale de gestion du moteur thermique, l'unité de commande agissant sous l'effet d'au moins un premier programme de pilotage pour piloter le ou les actionneurs en fonction d'un signal transmis à l'unité de commande par l'unité principale de gestion via les moyens de liaison. L'unité de commande comprend une mémoire conte- nant des informations palliatives et, en cas d'interruption du signal, l'unité de commande met en œuvre un second programme de pilotage pour piloter les ou les actionneurs en fonction des informations palliatives.To this end, it 'provides, according to the invention, a control unit of one or more electromagnetic actuators of the engine valve, said control unit being adapted to be connected by connecting means to a main management unit of the heat engine, the control unit acting under the effect of at least a first control program for controlling the actuator (s) as a function of a signal transmitted to the control unit by the main management unit via the connecting means. The control unit comprises a memory containing palliative information and, in case of interruption of the signal, the control unit implements a second control program for controlling the actuators or actuators as a function of the palliative information.
Ainsi, en cas d'absence de signal, l'unité de commande peut continuer à piloter l'actionneur en permettant ainsi au véhicule de fonctionner et par exemple de gagner un garage pour une réparation. L'actionneur se comporte alors en fait comme un arbre à came classique assurant le pilotage de l'actionneur selon un profil de commande fixe.Thus, in the absence of a signal, the control unit can continue to drive the actuator thus allowing the vehicle to operate and for example to win a garage for a repair. The actuator then behaves in fact like a conventional camshaft providing control of the actuator according to a fixed control profile.
Selon un mode de réalisation, les informations palliatives comprennent les angles d'ouverture et de fermeture de la soupape en fonction d'un régime du moteur thermique.According to one embodiment, the palliative information comprises the opening and closing angles of the valve as a function of a speed of the heat engine.
Ladite unité de commande pourra comprendre une unité de traitement interne permettant de convertir un ordre d' ouverture/fermeture de soupape, en un courant électrique, dit primaire, ladite instruction dépendant dudit signal transmis à l'unité de commande par l'unité principale ou, en cas d'interruption du signal, desdites informations palliatives .Said control unit may comprise an internal processing unit making it possible to convert a valve opening / closing order into an electric current, said primary, said instruction depending on said signal transmitted to the control unit by the main unit or in case of interruption of the signal, said palliative information.
Ladite unité de commande fonctionne en permanence, par exemple, soit en mode esclave par rapport à l'unité' principale de gestion, soit en autonome, en cas d'interruption du signal.Said control unit operates permanently, for example, either in slave mode with respect to the main management unit, or in stand-alone mode, in the event of signal interruption.
L'unité pourra en outre comprendre un convertisseur de tension, apte à délivrer audit ou auxdits actionneurs un courant secondaire dont la valeur de la tension dépend de la valeur de tension dudit courant primaire.The unit may further comprise a voltage converter, able to deliver to said actuator (s) a secondary current whose value of the voltage depends on the voltage value of said primary current.
L'invention concerne aussi un ensemble de paires constituée d'une dite unité de commande telle que décrite plus haut et d'un dit actionneur électromagnétique piloté par ladite unité de commande .The invention also relates to a set of pairs consisting of a said control unit as described above and a said electromagnetic actuator controlled by said control unit.
Selon un mode de réalisation, ledit ensemble comprend des moyens de synchronisation des unités de commande desdites paires.According to one embodiment, said set comprises means for synchronizing the control units of said pairs.
L'invention concerne encore un ensemble d'une unité de commande telle que décrite plus haute et de dits action- neurs électromagnétiques, pilotés par ladite unité de commande .The invention further relates to an assembly of a unit control unit as described above and said electromagnetic actuators, controlled by said control unit.
Selon un mode de réalisation, la dite unité de commande dudit ensemble est prévue distantes desdits action- neurs .According to one embodiment, said control unit of said set is provided remote from said actuators.
D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit d'un mode de mise en œuvre particulier non limitatif de 1 ' invention.Other features and advantages of the invention will emerge on reading the following description of a particular non-limiting embodiment of the invention.
BREVE DESCRIPTION DES DESSINSBRIEF 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 conforme à l'invention,FIG. 1 is a schematic perspective view of a heat engine according to the invention,
- la figure 2 est une vue schématique partielle en coupe transversale de ce moteur.- Figure 2 is a partial schematic cross sectional view of this engine.
DESCRIPTION DETAILLEE DE L'INVENTION En référence aux figures, le moteur thermique conforme à l'invention comporte un bloc 10 délimitant quatre cylindres 1, 2, 3, 4 en ligne. 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 vilebrequin 9 monté à pivotement dans le bloc 10.DETAILED DESCRIPTION OF THE INVENTION With reference to the figures, the heat engine according to the invention comprises a block 10 defining four cylinders 1, 2, 3, 4 in line. 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.
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 respectivement 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. Chaque actionneur électromagnétique 15, 16 est piloté par une unité de commande symbolisée en 19, 20. Dans un autre mode de réalisation, il pourra être prévu de tels actionneurs uniquement à l'admission ou uniquement à 1 ' échappement .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 respectively equipped with a gas valve. intake 13 and an exhaust valve 14 moved between two open and closed positions by electromagnetic actuators 15, 16 respectively. Each electromagnetic actuator 15, 16 is controlled by a control unit symbolized at 19, 20. In In another embodiment, such actuators may be provided only at the inlet or only at the exhaust.
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.An injector 18 of a fuel supply device is also mounted on the cylinder head 6.
Le moteur comprend en outre une unité principale de gestion (ou ECU, "Engine Control Unit") . Cette unité principale de gestion, représentée avec la référence 21, est reliée notamment aux injecteurs 18, aux actionneurs électromagnétiques 15, 16, et au circuit d'allumage pour commander ceux-ci. L'unité de gestion 21, connue en elle-même, comprend par exemple un module de traitement 22 ou de calcul tel qu'un processeur associé à une mémoire 23 contenant des programmes exécutés par le module de traitement 22.The engine further comprises a main management unit (or ECU, "Engine Control Unit"). This main management unit, represented with the reference 21, is connected in particular to the injectors 18, the electromagnetic actuators 15, 16, and the ignition circuit for controlling them. The management unit 21, itself known, comprises, for example, a processing module 22 or calculation module such as a processor associated with a memory 23 containing programs executed by the processing module 22.
De façon connue en soi, le cycle de fonctionnement de chacun des cylindres est un cycle à quatre temps comportant une phase (ou temps) d'admission, une phase de compression, une phase de détente et une phase d'échappement. Chaque phase représente un quart de cycle de fonctionnement, soit un demi-tour de vilebrequin.In a manner known per se, the operating cycle of each of the cylinders is a four-stroke cycle comprising an intake phase (or time), a compression phase, an expansion phase and an exhaust phase. Each phase represents a quarter cycle of operation, ie a half-turn of crankshaft.
En mode de fonctionnement normal, l'unité de gestion 21, qui est reliée par des moyens de liaison 24, 25 aux unités de commande 19, 20 des actionneurs électromagnétiques 15, 16, transmet aux unités de commande 19, 20 un signal qui détermine des angles d'ouverture et de fermeture de la soupape concernée sur un cycle de 720°, les températures d'eau et d'huile, un top de référence d'un point mort haut... afin de permettre aux unités de commande 19, 20 de piloter les actionneurs électromagnétiques 15, 16 en fonction des informations contenues dans le signal reçu.In normal operating mode, the management unit 21, which is connected by connecting means 24, 25 to the control units 19, 20 of the electromagnetic actuators 15, 16, transmits to the control units 19, 20 a signal which determines angles of opening and closing of the concerned valve on a cycle of 720 °, the water and oil temperatures, a reference top of a top dead center ... to allow the control units 19 , 20 to control the electromagnetic actuators 15, 16 according to the information contained in the received signal.
Selon l'invention, l'unité de commande comprend une mémoire 26, 27 contenant des informations palliatives corn- portant, notamment, des angles d'ouverture et de fermeture de la soupape en fonction du régime moteur.According to the invention, the control unit comprises a memory 26, 27 containing palliative information including, in particular, angles of opening and closing of the valve as a function of the engine speed.
En cas d'absence de signal, par exemple en raison d'une rupture de liaison entre l'unité de commande 19, 20 et l'unité de gestion 21, l'unité de commande 19, 20 exécute un programme de pilotage spécifique en utilisant les informations palliatives contenues dans les mémoires 26, 27. De préférence, les informations palliatives permettent un pilotage des actionneurs selon un profil correspondant à une conduite standard, c'est-à-dire résultant d'un compromis entre la consommation de carburant et les performances.In the absence of a signal, for example due to a link break between the control unit 19, 20 and the management unit 21, the control unit 19, 20 executes a specific control program in using the palliative information contained in the memories 26, 27. Preferably, the palliative information makes it possible to drive the actuators in a profile corresponding to a standard pipe, that is to say resulting from a compromise between fuel consumption and performances.
L'unité de commande est une unité intelligente, toujours active, fonctionnant, par exemple, soit en mode esclave par rapport à l'unité principale de gestion, soit en autonome, en cas d'interruption du signal. Ladite unité de commande comprenant en outre, par exemple, une unité de traitement interne permettant de convertir un ordre d'ouverture/fermeture de soupape, en un courant électrique, dit primaire, ledit courant dépendant dudit signal transmis à l'unité de commande par l'unité principale ou, en cas d'interruption du signal, desdites informations palliatives .The control unit is an intelligent unit, always active, operating, for example, either in slave mode relative to the main management unit, or in standalone, in case of interruption of the signal. Said control unit further comprising, for example, an internal processing unit for converting a valve opening / closing command, into an electrical current, said primary, said current depending on said signal transmitted to the control unit by the main unit or, in case of interruption of the signal, said palliative information.
Ladite unité de commande pourra aussi comprendre, un convertisseur de tension, apte à délivrer audit ou aux- dits actionneurs un courant secondaire dont la valeur de la tension dépend de la valeur de tension dudit courant primaire .Said control unit may also include, a voltage converter, capable of delivering to said one or more actuators a secondary current whose value of the voltage depends on the voltage value of said primary current.
Ladite unité de commande pourra, selon un premier exemple, non représenté, être la même pour tous les actionneurs. Elle est prévue distante et reliée par une connexion électrique, pour de courants destinés à alimenté une bobine d'un électro-aimant, à chacun des actionneurs.Said control unit may, according to a first example, not shown, be the same for all the actuators. It is provided remotely and connected by an electrical connection, for currents intended to feed a coil of an electromagnet, to each of the actuators.
Selon un autre mode de réalisation correspondant à celui illustré, elle pourra être prévue au niveau de chaque actionneur. Des moyens de synchronisation, non représentés, sont prévus pour assurer le mode de fonctionnement voulu du moteur sur l'ensemble des cylindres, par exemple en mettant en relation les unités de traitement interne de chacune desdites unités de commande qui pourront ainsi être cadencées les unes par rapport aux autres .According to another embodiment corresponding to that illustrated, it may be provided at each actuator. Synchronization means, not shown, are provided to ensure the desired mode of operation of the engine on all the cylinders, for example by relating the internal processing units of each of said control units which can thus be timed relative to each other.
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 l'invention tel que défini par les revendications.Of course, the invention is not limited to the embodiment described and variations can be made without departing from the scope of the invention as defined by the claims.
En particulier, sur les véhicules sportifs, les informations palliatives peuvent être orientées vers un profil de pilotage de l'actionneur correspondant à une conduite sportive, c'est-à-dire optimisé pour privilégier les performances du moteur.In particular, on sports vehicles, palliative information can be directed to a driving profile of the actuator corresponding to a sporty driving, that is to say, optimized to prioritize engine performance.
En outre, la mémoire 26, 27 peut contenir plusieurs programmes de pilotage et des informations palliatives différentes . In addition, the memory 26, 27 may contain several control programs and different palliative information.

Claims

REVENDICATIONS
1. Unité de commande (19, 20) d'un ou plusieurs ac- tionneurs (15, 16) électromagnétiques de soupape (13, 14) de moteur thermique, ladite unité de commande étant apte à être reliée par des moyens de liaison (24, 25) à une unité principale de gestion (21) du moteur thermique, l'unité de commande agissant sous l'effet d'au moins un premier programme de pilotage pour piloter le ou les actionneurs en fonction d'un signal transmis à l'unité de commande par l'unité principale de gestion via les moyens de liaison, caractérisé en ce que l'unité de commande comprend une mémoire (26, 27) contenant des informations palliatives et en ce que, en cas d'interruption du signal, l'unité de commande met en œuvre un second programme de pilotage pour piloter les ou les actionneurs en fonction des informations palliatives .1. Control unit (19, 20) of one or more electromagnetic actuators (15, 16) of the heat engine valve (13, 14), said control unit being able to be connected by connecting means ( 24, 25) to a main control unit (21) of the heat engine, the control unit acting under the effect of at least a first control program for controlling the actuator (s) as a function of a signal transmitted to the control unit by the main management unit via the connecting means, characterized in that the control unit comprises a memory (26, 27) containing palliative information and that, in case of interruption of the signal, the control unit implements a second control program for controlling the actuators or actuators according to the palliative information.
2. Unité de commande selon la revendication 1, dans lequel les informations palliatives comprennent les angles d'ouverture et de fermeture de la soupape en fonction d'un régime du moteur thermique.2. Control unit according to claim 1, wherein the palliative information comprises the opening and closing angles of the valve according to a speed of the engine.
3. Unité de commande selon la revendication 1 ou 2 comprenant en outre une unité de traitement interne permettant de convertir un ordre d'ouverture/fermeture de soupape, en un courant électrique, dit primaire, ledit courant dépendant dudit signal transmis à l'unité de commande par l'unité principale ou, en cas d'interruption du signal, desdites informations palliatives.3. Control unit according to claim 1 or 2 further comprising an internal processing unit for converting a valve opening / closing order, into an electrical current, said primary, said current depending on said signal transmitted to the unit command by the main unit or, in case of interruption of the signal, said palliative information.
4. Unité de commande selon la revendication 3 dans laquelle ladite unité de traitement fonctionne en permanence, soit en mode esclave par rapport à l'unité principale de gestion, soit en autonome, en cas d'interruption du signal .4. Control unit according to claim 3 wherein said processing unit operates continuously, either in slave mode relative to the main management unit, or in standalone, in case of interruption of the signal.
5. Unité de commande selon les revendications 3 ou 4 comprenant, en outre, un convertisseur de tension, apte à délivrer audit ou auxdits actionneurs un courant secondaire dont la valeur de la tension dépend de la valeur de tension dudit courant primaire.5. Control unit according to claims 3 or 4 further comprising a voltage converter, able to deliver to said actuator (s) a secondary current. whose value of the voltage depends on the voltage value of said primary current.
6. Ensemble de paires constituée d'une dite, unité de commande selon l'une quelconque des revendication précédentes et d'un dit actionneur électromagnétique piloté par ladite unité de commande.6. Set of pairs consisting of a said control unit according to any one of the preceding claims and an electromagnetic actuator controlled by said control unit.
7. Ensemble selon la revendication 5 comprenant des moyens de synchronisation des unités de commande desdites paires .7. The assembly of claim 5 comprising means for synchronizing the control units of said pairs.
8. Ensemble d'une unité de commande selon l'une quelconque des revendications précédentes et de dits ac- tionneurs électromagnétiques, pilotés par ladite unité de commande .8. An assembly of a control unit according to any one of the preceding claims and said electromagnetic actuators, controlled by said control unit.
9. Ensemble selon la revendication 7 dans laquelle la dite unité de commande est prévue distantes desdits ac- tionneurs . 9. The assembly of claim 7 wherein said control unit is provided remote from said actuators.
EP08875608A 2008-07-30 2008-07-30 Control unit for one or more electromagnetic actuators of a heat engine valve, and different assemblies of such control units and such electromagnetic actuators Withdrawn EP2307674A1 (en)

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JP5385386B2 (en) 2014-01-08
JP2011529547A (en) 2011-12-08
US20110178696A1 (en) 2011-07-21

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