EP3894684A1 - Method for heating the liquid coolant of an internal combustion engine after a cold start - Google Patents

Method for heating the liquid coolant of an internal combustion engine after a cold start

Info

Publication number
EP3894684A1
EP3894684A1 EP19823803.2A EP19823803A EP3894684A1 EP 3894684 A1 EP3894684 A1 EP 3894684A1 EP 19823803 A EP19823803 A EP 19823803A EP 3894684 A1 EP3894684 A1 EP 3894684A1
Authority
EP
European Patent Office
Prior art keywords
temperature
engine
coolant
oil
starting
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.)
Granted
Application number
EP19823803.2A
Other languages
German (de)
French (fr)
Other versions
EP3894684B1 (en
Inventor
Francois GUILCHARD
Fabrice Charlette
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.)
Stellantis Auto SAS
Original Assignee
PSA Automobiles SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PSA Automobiles SA filed Critical PSA Automobiles SA
Publication of EP3894684A1 publication Critical patent/EP3894684A1/en
Application granted granted Critical
Publication of EP3894684B1 publication Critical patent/EP3894684B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02D41/06—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
    • 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
    • F02D41/068—Introducing corrections for particular operating conditions for engine starting or warming up for warming-up
    • 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
    • F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
    • F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
    • F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
    • 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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/023—Engine temperature
    • 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
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/024—Engine oil temperature

Definitions

  • TITLE METHOD FOR HEATING THE COOLANT OF AN INTERNAL COMBUSTION ENGINE AFTER A COLD START
  • the invention relates, in general, to the field of control laws for electronic control units, designated ECUs “for Electronic Control Units” in English, for the starting of an internal combustion engine, in particular mounted within 'a motor vehicle.
  • the invention relates more particularly to a method of heating the coolant of an engine after a cold start.
  • the additional boiler heats the branch of the water circuit going to the air heater, thus making it possible to immediately heat the passenger compartment, defrost the windows and preheat the engine of the vehicle before it starts.
  • the additional boiler operates independently of the engine, but it is supplied by the vehicle's electrical circuit and by the engine's fuel circuit.
  • the air heater is an autonomous device used to heat a specific space, such as the passenger compartment of a vehicle. It consists of a heat exchanger fitted with a fan. The heat comes from a hot water or steam network, an electric coil or a gas burner whose exhaust passes inside the exchanger. The forced air circulates outside the heat exchanger of the air heater where it is heated. The jet of hot air produced is then directed towards the space to be heated.
  • the additional boiler therefore preheats the coolant circuit before starting the engine, the operation of this boiler being separate and independent from the operation of the engine.
  • the heat generated by the additional boiler is then transmitted to the interior of the vehicle by a dedicated ventilation system. The passenger compartment and the vehicle engine are therefore heated.
  • a time limited to a reduced time of the use of the additional boiler produces an increase in the temperature of the coolant, designated water temperature, but not in the temperature of the engine oil, designated temperature the oil, which fails to rise sufficiently.
  • the engine oil is heated only by conduction with the engine block of the vehicle which is itself heated by the circulation of the coolant heated by the additional boiler. Too short a period of use of the additional boiler therefore limits the heating of the engine oil.
  • the control laws stored by the electronic control unit for vehicle engines draw up maps for the starting phase of the vehicle engine as a function of the engine speed and of the water temperature, without taking account of the oil temperature.
  • an insufficient temperature of the engine oil leads to losses in terms of friction in the engine, causing stalling and operating problems under engine speed.
  • the electronic control unit applies parameters that are not adapted to the friction losses of the engine, the initialization of the torque structure is then incorrect, causing stalling after starting the engine. In fact, the speed at which the transition takes place between the start-up phase and the post-start-up phase is then too low compared to the friction losses actually seen by the engine.
  • the invention therefore aims to solve these drawbacks by proposing a method of heating the coolant of a motorization system of a vehicle produced just after starting the engine, by correcting the initialization of the engine torque structure during Too short use of the additional boiler.
  • the present invention relates to a method for controlling a motorization system of a vehicle, in particular of a motor vehicle, the motorization system comprising a boiler for heating a coolant circuit before starting. of the motorization system, an electronic control unit executing the control method of the motorization system to control the starting of the engine, and an oil circuit, said control method comprising: measuring the temperature of the coolant and the measurement of the engine oil temperature, comparison of the temperature difference between the coolant temperature and the engine oil temperature against a temperature threshold that can be calibrated according to engine friction losses, if after starting the engine system the temperature difference between the coolant temperature and the oil temperature of the engine is greater than said calibrable temperature threshold, the implementation of a control law comprising an engine speed reference vector determining the starting output which is a function of the oil temperature, and if after starting the system motorization the temperature difference between the temperature of the coolant and the temperature of the engine oil is less than said calibrated temperature threshold, the implementation of a control law comprising a determining engine speed setpoint vector the start output
  • a control law determines an initialization vector of torque setpoint which is a function of the engine oil temperature, and if after starting the engine system the temperature difference between the temperature of the coolant and the oil temperature is less than said calibrated temperature threshold , said method comprises the implementation of a control law comprising a torque setpoint initialization vector which is a function of the temperature of the coolant.
  • the method comprises a step of recording the value of a set of elements which participate in the control of the effective torque produced by the motor in the memory of the electronic control unit.
  • the method comprises carrying out a mapping of the temperatures and of the engine speed, in order to determine the temperature threshold which can be calibrated as a function of the friction losses of the engine.
  • the map is indexed according to the temperature of the engine oil.
  • the temperature difference between the temperature of the coolant and the engine oil temperature above said calibrable temperature threshold is determined by the generation of a code by the electronic control unit.
  • the temperature difference between the temperature of the coolant and the engine oil temperature below said calibrable temperature threshold is determined by the generation of a code by the electronic control unit.
  • the present invention also relates to an electronic control unit for a motorization system of a vehicle, configured to implement the method of controlling a motorization system of a vehicle as briefly described above.
  • the present invention also relates to a motor vehicle comprising such an electronic control unit.
  • FIG. 1 schematically illustrates the detection of the temperature difference between the temperature of the coolant and the temperature of the engine oil, just after the engine start-up phase
  • FIG. 2 schematically illustrates the application of the engine speed setpoint vector determining the starting output
  • FIG. 3 schematically illustrates the application of the torque setpoint initialization vector.
  • the embodiments described relate more particularly to an implementation of the method for controlling a motorization system according to the invention within a motor vehicle.
  • any implementation in a different context, in particular in any type of vehicle, is also covered by the present invention.
  • FIG. 1 represents a diagram of the detection of the temperature difference between the temperature of the coolant 1 and the temperature of the engine oil 2, at the instant after starting of the engine, that is to say at the time of the transition between the starting phase and the post-starting phase of the engine, during the initialization of all the elements which participate in the control of the effective torque produced by engine.
  • the regime from which the transition takes place between the start-up phase and the post-start-up phase is generally mapped by a table indexed in water temperature.
  • this indexing according to the water temperature is unsuitable in the case of the use of an additional boiler for a short period because the temperature of the water is high while that of the oil does not is not.
  • the water temperature is not a parameter which takes into account the actual friction losses of the engine, unlike the oil temperature.
  • the initialization torque used to initiate the torque structure is then too low compared to the actual torque and the temperature difference between the water temperature and the oil temperature generates an under-speed of the engine, the regulator idling struggling to restore engine speed to its setpoint. The friction losses are therefore reflected in the engine by driving under speed and engine stalling.
  • FIG. 1 represents a diagram for detecting the temperature difference between the temperature of the coolant 1 and the temperature of the engine oil 2.
  • a calibrable temperature threshold 3 When the engine starts 4, and that the difference between the temperature of the coolant cooling 1 and the engine oil temperature 2 is higher than a calibrable temperature threshold 3, then the critical situation likely to generate an engine stall or driving under speed is identified, the two conditions mentioned must necessarily be 5.
  • a specific SITUATION_DE_VIE_CRITIQUE code is created 6.
  • a message can then be displayed on a screen on board the vehicle, indicating that said critical situation has been identified. The screen then displays a text indicating that the SITUATION_DE_VIE_CRITIQUE code is TRUE 8.
  • FIG. 2 represents a diagram of application of the method according to the invention to the transition regime from starting to the engine torque structure, if the temperature difference between the temperature of the coolant 1 and the oil temperature of the engine 2 has exceeded the calibrable temperature threshold 3, then the critical situation likely to generate an engine stall or driving under-speed is identified, these two conditions must necessarily be met.
  • a specific SITUATION_DE_VIE_CRITIQUE code is created 6.
  • a message can then be displayed on a screen on board the vehicle, indicating that said critical situation has been identified.
  • the transition speed to the engine torque structure 11 is produced from a table indexed as a function of the oil temperature of the engine 2, making it possible to obtain a target vector of the engine speed determining the output of start depending on engine oil temperature 10.
  • the critical situation n is not identified 7.
  • a message can then be displayed on a screen on board the vehicle, indicating that said critical situation has not been identified.
  • the transition speed to the engine torque structure 11 is produced from a table indexed as a function of the temperature of the coolant 1, a vector of engine speed setpoint determining the starting output as a function of the coolant temperature 12.
  • FIG. 3 represents a diagram of application of the method according to the invention to the initialization torque of all the elements which participate in the control of the effective torque produced by the engine, when the temperature difference between the liquid temperature of cooling 1 and the engine oil temperature 2 has exceeded the calibrable temperature threshold 3.
  • the initialization torque of all the elements which participate in the control of the effective torque produced by the engine 14 is then produced from a table indexed as a function of the oil temperature of the engine 2, in order to obtain a torque setting initialization vector as a function of the oil temperature 13.
  • the initialization torque of all the elements which participate in the control of the effective torque produced by the engine 14 is then produced by a table indexed as a function of the temperature of the coolant 1 and a vector is obtained as a function of the temperature of the coolant 1 of the torque for initializing the torque setpoint 15.
  • the method according to the invention therefore makes it possible to avoid stalling of the engine only by means of the vehicle control laws and without the addition of additional parts.
  • the electronic control unit takes into account the temperature of the engine oil rather than that of the coolant after the cold start of the engine, thus making it possible to avoid losses by friction.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The invention relates to a method for controlling a propulsion system, comprising a heater to heat a liquid-coolant circuit before the start, an oil circuit, said method involving measuring the temperature of the liquid (1) and measuring the temperature of the engine oil (2), comparing the difference between these two temperatures with a temperature threshold that can be calibrated as a function of friction losses by the engine, if, after the start, the difference is above said calibratable temperature threshold, a control law determines an engine speed setpoint vector that determines the exiting of the start (10) which is dependent on the temperature of the oil (2) and if, after the start, the difference is below said calibratable temperature threshold, a control law determines an engine speed setpoint vector that determines the exiting of the start (10) which is dependent on the temperature of the liquid (1).

Description

DESCRIPTION DESCRIPTION
TITRE : PROCEDE DE CHAUFFAGE DU LIQUIDE DE REFROIDISSEMENT D'UN MOTEUR A COMBUSTION INTERNE APRES UN DEMARRAGE A FROID TITLE: METHOD FOR HEATING THE COOLANT OF AN INTERNAL COMBUSTION ENGINE AFTER A COLD START
Domaine technique Technical area
L'invention concerne, de façon générale, le domaine des lois de commande d'unités de contrôle électronique, désignés ECU « pour Electronic Control Unit » en anglais, pour le démarrage d'un moteur à combustion interne, en particulier monté au sein d'un véhicule automobile. The invention relates, in general, to the field of control laws for electronic control units, designated ECUs “for Electronic Control Units” in English, for the starting of an internal combustion engine, in particular mounted within 'a motor vehicle.
L'invention porte plus particulièrement sur un procédé de chauffage du liquide de refroidissement d'un moteur après un démarrage à froid. The invention relates more particularly to a method of heating the coolant of an engine after a cold start.
Technique antérieure Prior art
De manière connue, le chauffage rapide de l'habitacle d'un véhicule est obtenu grâce à l'utilisation d'une chaudière additionnelle chauffant le liquide de refroidissement du moteur, notamment en hiver lorsque les températures sont les plus froides. In known manner, rapid heating of the passenger compartment of a vehicle is obtained through the use of an additional boiler heating the engine coolant, especially in winter when the temperatures are coldest.
En effet, la chaudière additionnelle chauffe la branche du circuit d'eau allant à l'aérotherme, permettant ainsi de chauffer immédiatement l'habitacle, de dégivrer les vitres et de préchauffer le moteur thermique du véhicule avant son démarrage. La chaudière additionnelle fonctionne indépendamment du moteur mais elle est alimentée par le circuit électrique du véhicule et par le circuit de carburant du moteur. In fact, the additional boiler heats the branch of the water circuit going to the air heater, thus making it possible to immediately heat the passenger compartment, defrost the windows and preheat the engine of the vehicle before it starts. The additional boiler operates independently of the engine, but it is supplied by the vehicle's electrical circuit and by the engine's fuel circuit.
L'aérotherme est un appareil autonome servant à chauffer un espace spécifique, tel que l'habitacle d'un véhicule. Il est composé d'un échangeur de chaleur muni d'un ventilateur. La chaleur provient d'un réseau d'eau chaude ou de vapeur, d'un serpentin électrique ou d'un brûleur à gaz dont l'échappement passe à l'intérieur de l'échangeur. L'air pulsé circule à l'extérieur de l'échangeur de l'aérotherme où il est réchauffé. Le jet d'air chaud produit est alors dirigé vers l'espace à chauffer. The air heater is an autonomous device used to heat a specific space, such as the passenger compartment of a vehicle. It consists of a heat exchanger fitted with a fan. The heat comes from a hot water or steam network, an electric coil or a gas burner whose exhaust passes inside the exchanger. The forced air circulates outside the heat exchanger of the air heater where it is heated. The jet of hot air produced is then directed towards the space to be heated.
La chaudière additionnelle préchauffe donc le circuit de liquide de refroidissement avant le démarrage du moteur, le fonctionnement de cette chaudière étant séparé et autonome du fonctionnement du moteur. La chaleur générée par la chaudière additionnelle est ensuite transmise à l'intérieur du véhicule par un système de ventilation dédié. L'habitacle ainsi que le moteur du véhicule sont donc chauffés. The additional boiler therefore preheats the coolant circuit before starting the engine, the operation of this boiler being separate and independent from the operation of the engine. The heat generated by the additional boiler is then transmitted to the interior of the vehicle by a dedicated ventilation system. The passenger compartment and the vehicle engine are therefore heated.
Cependant, une durée limitée à un temps réduit de l'utilisation de la chaudière additionnelle produit une augmentation de la température du liquide de refroidissement, désignée température de l'eau, mais pas de la température de l'huile du moteur, désignée température de l'huile, qui ne parvient pas à s'élever suffisamment. En effet, l'huile du moteur est chauffée uniquement par conduction avec le bloc moteur du véhicule qui est lui-même réchauffé par la circulation du liquide de refroidissement chauffé par la chaudière additionnelle. Une durée trop courte d'utilisation de la chaudière additionnelle limite donc le réchauffement de l'huile du moteur. However, a time limited to a reduced time of the use of the additional boiler produces an increase in the temperature of the coolant, designated water temperature, but not in the temperature of the engine oil, designated temperature the oil, which fails to rise sufficiently. Indeed, the engine oil is heated only by conduction with the engine block of the vehicle which is itself heated by the circulation of the coolant heated by the additional boiler. Too short a period of use of the additional boiler therefore limits the heating of the engine oil.
Or, les pertes de frottements dans le moteur dépendent de la viscosité de l'huile en fonction de la température. Une température insuffisante de l'huile de moteur a alors pour conséquence des pertes au niveau des frottements dans le moteur, occasionnant des problèmes de calage et de fonctionnement en sous régime du moteur. On connaît par le document US8763577B2 un moteur à combustion interne pourvu d'un système de réchauffage pour chauffer le liquide de refroidissement du moteur. Dans ce cas, la température du liquide de refroidissement et de l'huile de moteur sont déterminées. Si la différence de température entre ces deux températures est supérieure à une valeur seuil donnée, alors la quantité de carburant de départ augmente. However, the friction losses in the engine depend on the viscosity of the oil as a function of the temperature. An insufficient temperature of the engine oil then results in losses in terms of friction in the engine, causing stalling and operating problems under engine speed. Document US8763577B2 discloses an internal combustion engine provided with a heating system for heating the engine coolant. In this case, the temperature of the coolant and engine oil are determined. If the temperature difference between these two temperatures is greater than a given threshold value, then the quantity of starting fuel increases.
Cependant, les lois de commande stockées par l'unité de contrôle électronique pour moteur de véhicules élaborent des cartographies pour la phase de démarrage du moteur du véhicule en fonction du régime du moteur et de la température de l'eau, sans tenir compte de la température de l'huile. Or, une température insuffisante de l'huile de moteur entraîne des pertes au niveau des frottements dans le moteur occasionnant des problèmes de calage et de fonctionnement en sous régime du moteur. En utilisant des cartographies basées principalement sur la température de l'eau et non sur la température de l'huile, l'unité de contrôle électronique applique des paramètres non adaptés aux pertes par frottement du moteur, l'initialisation de la structure couple est alors incorrecte, engendrant des calages après le démarrage du moteur. En effet, le régime à partir duquel s'opère la transition entre la phase de démarrage et la phase d'après démarrage est alors trop bas par rapport aux pertes de frottement réellement vues par le moteur. However, the control laws stored by the electronic control unit for vehicle engines draw up maps for the starting phase of the vehicle engine as a function of the engine speed and of the water temperature, without taking account of the oil temperature. However, an insufficient temperature of the engine oil leads to losses in terms of friction in the engine, causing stalling and operating problems under engine speed. By using maps mainly based on the water temperature and not on the oil temperature, the electronic control unit applies parameters that are not adapted to the friction losses of the engine, the initialization of the torque structure is then incorrect, causing stalling after starting the engine. In fact, the speed at which the transition takes place between the start-up phase and the post-start-up phase is then too low compared to the friction losses actually seen by the engine.
L'invention vise donc à résoudre ces inconvénients en proposant un procédé de chauffage du liquide de refroidissement d'un système de motorisation d'un véhicule réalisé juste après le démarrage du moteur, en corrigeant l'initialisation de la structure couple moteur lors d'une utilisation trop courte de la chaudière additionnelle. The invention therefore aims to solve these drawbacks by proposing a method of heating the coolant of a motorization system of a vehicle produced just after starting the engine, by correcting the initialization of the engine torque structure during Too short use of the additional boiler.
Résumé de l’invention Summary of the invention
Pour parvenir à ce résultat, la présente invention concerne un procédé de commande d'un système de motorisation d'un véhicule, notamment d'un véhicule automobile, le système de motorisation comprenant une chaudière pour chauffer un circuit de liquide de refroidissement avant le démarrage du système de motorisation, une unité de contrôle électronique exécutant le procédé de commande du système de motorisation pour contrôler le démarrage du moteur, et un circuit d'huile, ledit procédé de commande comprenant : la mesure de la température du liquide de refroidissement et la mesure de la température de l'huile du moteur, la comparaison de l'écart de température entre la température du liquide de refroidissement et la température de l'huile du moteur vis-à-vis d'un seuil de température calibrable en fonction des pertes par frottement du moteur, si après démarrage du système de motorisation l'écart de température entre la température du liquide de refroidissement et la température de l'huile du moteur est supérieur audit seuil de température calibrable, la mise en oeuvre d'une loi de commande comprenant un vecteur de consigne de régime moteur déterminant la sortie de démarrage qui est fonction de la température de l'huile, et si après démarrage du système de motorisation l'écart de température entre la température du liquide de refroidissement et la température de l'huile du moteur est inférieur audit seuil de température calibrable, la mise en oeuvre d'une loi de commande comprenant un vecteur de consigne de régime moteur déterminant la sortie de démarrage qui est fonction de la température du liquide de refroidissement. To achieve this result, the present invention relates to a method for controlling a motorization system of a vehicle, in particular of a motor vehicle, the motorization system comprising a boiler for heating a coolant circuit before starting. of the motorization system, an electronic control unit executing the control method of the motorization system to control the starting of the engine, and an oil circuit, said control method comprising: measuring the temperature of the coolant and the measurement of the engine oil temperature, comparison of the temperature difference between the coolant temperature and the engine oil temperature against a temperature threshold that can be calibrated according to engine friction losses, if after starting the engine system the temperature difference between the coolant temperature and the oil temperature of the engine is greater than said calibrable temperature threshold, the implementation of a control law comprising an engine speed reference vector determining the starting output which is a function of the oil temperature, and if after starting the system motorization the temperature difference between the temperature of the coolant and the temperature of the engine oil is less than said calibrated temperature threshold, the implementation of a control law comprising a determining engine speed setpoint vector the start output which is a function of the coolant temperature.
Avantageusement, si après démarrage du système de motorisation, l'écart de température entre la température du liquide de refroidissement et la température de l'huile du moteur est inférieur audit seuil de température calibrable, une loi de commande détermine un vecteur d'initialisation de consigne de couple qui est fonction de la température de l'huile du moteur, et si après démarrage du système de motorisation l'écart de température entre la température du liquide de refroidissement et la température de l'huile est inférieur audit seuil de température calibrable, ledit procédé comprend la mise en œuvre d'une loi de commande comprenant un vecteur d'initialisation de consigne de couple qui est fonction de la température du liquide de refroidissement. Advantageously, if after starting the engine system, the temperature difference between the temperature of the coolant and the engine oil temperature is less than said calibrable temperature threshold, a control law determines an initialization vector of torque setpoint which is a function of the engine oil temperature, and if after starting the engine system the temperature difference between the temperature of the coolant and the oil temperature is less than said calibrated temperature threshold , said method comprises the implementation of a control law comprising a torque setpoint initialization vector which is a function of the temperature of the coolant.
De manière avantageuse, le procédé comprend une étape d'enregistrement de la valeur d'un ensemble d'éléments qui participent au contrôle du couple efficace produit par le moteur dans la mémoire de l'unité de contrôle électronique. Advantageously, the method comprises a step of recording the value of a set of elements which participate in the control of the effective torque produced by the motor in the memory of the electronic control unit.
Avantageusement, le procédé comprend la réalisation d'une cartographie des températures et du régime du moteur, pour déterminer le seuil de température calibrable en fonction des pertes par frottement du moteur. Advantageously, the method comprises carrying out a mapping of the temperatures and of the engine speed, in order to determine the temperature threshold which can be calibrated as a function of the friction losses of the engine.
De manière avantageuse, la cartographie est indexée selon la température de l'huile du moteur. Advantageously, the map is indexed according to the temperature of the engine oil.
Avantageusement, l'écart de température entre la température du liquide de refroidissement et la température de l'huile du moteur supérieur audit seuil de température calibrable est déterminé par la génération d'un code par l'unité de contrôle électronique. Advantageously, the temperature difference between the temperature of the coolant and the engine oil temperature above said calibrable temperature threshold is determined by the generation of a code by the electronic control unit.
De manière avantageuse, l'écart de température entre la température du liquide de refroidissement et la température de l'huile du moteur inférieur audit seuil de température calibrable est déterminé par la génération d'un code par l'unité de contrôle électronique. Advantageously, the temperature difference between the temperature of the coolant and the engine oil temperature below said calibrable temperature threshold is determined by the generation of a code by the electronic control unit.
La présente invention vise également une unité de contrôle électronique pour un système de motorisation d'un véhicule, configurée pour mettre en œuvre le procédé de commande d'un système de motorisation d'un véhicule tel que brièvement décrit ci-dessus. The present invention also relates to an electronic control unit for a motorization system of a vehicle, configured to implement the method of controlling a motorization system of a vehicle as briefly described above.
La présente invention vise aussi un véhicule automobile comprenant une telle unité de contrôle électronique. The present invention also relates to a motor vehicle comprising such an electronic control unit.
Brève description des dessins Brief description of the drawings
L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple, et se référant aux dessins annexés donnés à titre d'exemples non limitatifs, dans lesquels des références identiques sont données à des objets semblables et sur lesquels : The invention will be better understood on reading the description which follows, given solely by way of example, and referring to the appended drawings given by way of nonlimiting examples, in which identical references are given to similar objects. and on which:
[Fig. 1] illustre schématiquement la détection de l'écart de température entre la température du liquide de refroidissement et la température de l'huile du moteur, juste après la phase de démarrage du moteur ; [Fig. 1] schematically illustrates the detection of the temperature difference between the temperature of the coolant and the temperature of the engine oil, just after the engine start-up phase;
[Fig. 2] illustre schématiquement l'application du vecteur de consigne du régime moteur déterminant la sortie de démarrage ; [Fig. 2] schematically illustrates the application of the engine speed setpoint vector determining the starting output;
[Fig. 3] illustre schématiquement l'application du vecteur d'initialisation de consigne de couple. [Fig. 3] schematically illustrates the application of the torque setpoint initialization vector.
Description des modes de réalisation Description of the embodiments
Il faut noter que les figures exposent l'invention de manière détaillée pour mettre en œuvre l'invention, lesdites figures pouvant bien entendu servir à mieux définir l'invention le cas échéant. It should be noted that the figures show the invention in detail to implement the invention, said figures can of course be used to better define the invention if necessary.
Dans ce qui va suivre, les modes de réalisation décrits s'attachent plus particulièrement à une mise en œuvre du procédé de commande d'un système de motorisation selon l'invention au sein d'un véhicule automobile. Cependant, toute mise en œuvre dans un contexte différent, en particulier dans tout type de véhicule, est également visée par la présente invention. In what follows, the embodiments described relate more particularly to an implementation of the method for controlling a motorization system according to the invention within a motor vehicle. However, any implementation in a different context, in particular in any type of vehicle, is also covered by the present invention.
La figure 1 représente un schéma de la détection de l'écart de température entre la température du liquide de refroidissement 1 et la température de l'huile du moteur 2, à l'instant suivant le démarrage du moteur, c'est-à-dire au moment de la transition entre la phase de démarrage et la phase d'après démarrage du moteur, lors de l'initialisation de l'ensemble des éléments qui participent au contrôle du couple efficace produit par le moteur. FIG. 1 represents a diagram of the detection of the temperature difference between the temperature of the coolant 1 and the temperature of the engine oil 2, at the instant after starting of the engine, that is to say at the time of the transition between the starting phase and the post-starting phase of the engine, during the initialization of all the elements which participate in the control of the effective torque produced by engine.
Le régime à partir duquel s'opère la transition entre la phase de démarrage et la phase d'après démarrage est généralement cartographié par une table indexée en température de l'eau. Cependant, cette indexation en fonction de la température de l'eau est inadaptée dans le cas de l'utilisation d'une chaudière additionnelle pendant une courte durée car la température de l'eau est élevée tandis que celle de l'huile ne l'est pas. The regime from which the transition takes place between the start-up phase and the post-start-up phase is generally mapped by a table indexed in water temperature. However, this indexing according to the water temperature is unsuitable in the case of the use of an additional boiler for a short period because the temperature of the water is high while that of the oil does not is not.
Or, la température de l'eau n'est pas un paramètre qui tient compte des pertes de frottements réelles du moteur, contrairement à la température de l'huile. Le couple d'initialisation utilisé pour initier la structure couple est alors trop bas par rapport au couple réel et l'écart de température entre la température de l'eau et la température de l'huile engendre un sous-régime du moteur, le régulateur de ralenti peinant à rétablir le régime moteur sur sa consigne. Les pertes de frottements se traduisent donc au niveau du moteur par une conduite en sous-régime et des calages du moteur. However, the water temperature is not a parameter which takes into account the actual friction losses of the engine, unlike the oil temperature. The initialization torque used to initiate the torque structure is then too low compared to the actual torque and the temperature difference between the water temperature and the oil temperature generates an under-speed of the engine, the regulator idling struggling to restore engine speed to its setpoint. The friction losses are therefore reflected in the engine by driving under speed and engine stalling.
La figure 1 représente un schéma de détection de l'écart de température entre la température du liquide de refroidissement 1 et la température de l'huile du moteur 2. Lorsque le moteur démarre 4, et que l'écart entre la température du liquide de refroidissement 1 et la température de l'huile du moteur 2 est supérieure à un seuil de température calibrable 3, alors la situation critique susceptible de générer un calage du moteur ou une conduite en sous-régime est identifiée, les deux conditions citées devant nécessairement être réunies 5. Dans ce cas, par exemple, un code spécifique SITUATION_DE_VIE_CRITIQUE est créé 6. Selon un mode de réalisation, un message peut s'afficher alors sur un écran à bord du véhicule, indiquant que ladite situation critique a été identifiée. L'écran affiche alors un libellé traduisant que le code SITUATION_DE_VIE_CRITIQUE est VRAI 8. Dans le cas contraire, c'est-à-dire si l'écart entre la température du liquide de refroidissement 1 et la température de l'huile du moteur 2 est inférieur ou égal audit seuil de température calibrable 3, alors la situation critique n'est pas identifiée 7. Dans ce cas, un message indiquant SITUATION_DE_VIE_CRITIQUE est FAUX 9 s'affiche sur l'écran de bord du véhicule. FIG. 1 represents a diagram for detecting the temperature difference between the temperature of the coolant 1 and the temperature of the engine oil 2. When the engine starts 4, and that the difference between the temperature of the coolant cooling 1 and the engine oil temperature 2 is higher than a calibrable temperature threshold 3, then the critical situation likely to generate an engine stall or driving under speed is identified, the two conditions mentioned must necessarily be 5. In this case, for example, a specific SITUATION_DE_VIE_CRITIQUE code is created 6. According to one embodiment, a message can then be displayed on a screen on board the vehicle, indicating that said critical situation has been identified. The screen then displays a text indicating that the SITUATION_DE_VIE_CRITIQUE code is TRUE 8. Otherwise, that is, if the difference between the coolant temperature 1 and the engine oil temperature 2 is less than or equal to said calibrable temperature threshold 3, then the critical situation is not identified 7. In this case, a message indicating SITUATION_DE_VIE_CRITIQUE est FAUX 9 is displayed on the vehicle dashboard screen.
La figure 2 représente un schéma d'application du procédé selon l'invention au régime de transition du démarrage vers la structure couple moteur, si l'écart de température entre la température du liquide de refroidissement 1 et la température d'huile du moteur 2 a dépassé le seuil de température calibrable 3, alors la situation critique susceptible de générer un calage du moteur ou une conduite en sous-régime est identifiée, ces deux conditions devant nécessairement être réunies. Dans ce cas, par exemple, un code spécifique SITUATION_DE_VIE_CRITIQUE est créé 6. Selon un mode de réalisation, un message peut s'afficher alors sur un écran à bord du véhicule, indiquant que ladite situation critique a été identifiée. Dans ce cas le régime de transition vers la structure couple moteur 11 est réalisé à partir d'une table indexée en fonction de la température de l'huile du moteur 2, permettant d'obtenir un vecteur de consigne du régime moteur déterminant la sortie de démarrage en fonction de la température de l'huile du moteur 10. FIG. 2 represents a diagram of application of the method according to the invention to the transition regime from starting to the engine torque structure, if the temperature difference between the temperature of the coolant 1 and the oil temperature of the engine 2 has exceeded the calibrable temperature threshold 3, then the critical situation likely to generate an engine stall or driving under-speed is identified, these two conditions must necessarily be met. In this case, for example, a specific SITUATION_DE_VIE_CRITIQUE code is created 6. According to one embodiment, a message can then be displayed on a screen on board the vehicle, indicating that said critical situation has been identified. In this case, the transition speed to the engine torque structure 11 is produced from a table indexed as a function of the oil temperature of the engine 2, making it possible to obtain a target vector of the engine speed determining the output of start depending on engine oil temperature 10.
Dans le cas contraire, c'est-à-dire si l'écart entre la température du liquide de refroidissement 1 et la température de l'huile du moteur 2 est inférieur ou égale audit seuil de température calibrable 3, alors la situation critique n'est pas identifiée 7. Selon un mode de réalisation, un message peut s'afficher alors sur un écran à bord du véhicule, indiquant que ladite situation critique n'a pas été identifiée. Dans ce cas, le régime de transition vers la structure couple moteur 11 est réalisé à partir d'une table indexée en fonction de la température du liquide de refroidissement 1, on obtient alors un vecteur de consigne du régime moteur déterminant la sortie de démarrage en fonction de la température du liquide de refroidissement 12. Otherwise, that is to say if the difference between the temperature of the coolant 1 and the temperature of the engine oil 2 is less than or equal to said calibrable temperature threshold 3, then the critical situation n is not identified 7. According to one embodiment, a message can then be displayed on a screen on board the vehicle, indicating that said critical situation has not been identified. In this case, the transition speed to the engine torque structure 11 is produced from a table indexed as a function of the temperature of the coolant 1, a vector of engine speed setpoint determining the starting output as a function of the coolant temperature 12.
La figure 3 représente un schéma d'application du procédé selon l'invention au couple d'initialisation de l'ensemble des éléments qui participent au contrôle du couple efficace produit par le moteur, lorsque l'écart de température entre la température de liquide de refroidissement 1 et la température de l'huile du moteur 2 a dépassé le seuil de température calibrable 3. Comme précédemment, lorsque par exemple le code SITUATION_DE_VIE_CRITIQUE est créé 6 et que le conducteur reçoit un message sur un écran de bord du véhicule lui signalant que la situation critique est identifiée 8, le couple d'initialisation de l'ensemble des éléments qui participent au contrôle du couple efficace produit par le moteur 14 est alors réalisé à partir d'une table indexée en fonction de la température de l'huile du moteur 2, afin d'obtenir un vecteur d'initialisation de consigne du couple en fonction de la température d'huile 13. FIG. 3 represents a diagram of application of the method according to the invention to the initialization torque of all the elements which participate in the control of the effective torque produced by the engine, when the temperature difference between the liquid temperature of cooling 1 and the engine oil temperature 2 has exceeded the calibrable temperature threshold 3. As before, when for example the code SITUATION_DE_VIE_CRITIQUE is created 6 and the driver receives a message on a vehicle dashboard signaling that the critical situation is identified 8, the initialization torque of all the elements which participate in the control of the effective torque produced by the engine 14 is then produced from a table indexed as a function of the oil temperature of the engine 2, in order to obtain a torque setting initialization vector as a function of the oil temperature 13.
En revanche, si la situation critique n'est pas identifiée 7 (par exemple, le code SITUATION_DE_VIE_CRITIQUE n'est pas créé), le couple d'initialisation de l'ensemble des éléments qui participent au contrôle du couple efficace produit par le moteur 14 est alors réalisé par une table indexée en fonction de la température du liquide de refroidissement 1 et on obtient un vecteur en fonction de la température du liquide de refroidissement 1 du couple d'initialisation de consigne de couple 15. On the other hand, if the critical situation is not identified 7 (for example, the SITUATION_DE_VIE_CRITIQUE code is not created), the initialization torque of all the elements which participate in the control of the effective torque produced by the engine 14 is then produced by a table indexed as a function of the temperature of the coolant 1 and a vector is obtained as a function of the temperature of the coolant 1 of the torque for initializing the torque setpoint 15.
Le procédé selon l'invention permet donc d'éviter les calages du moteur uniquement par l'intermédiaire des lois de commande du véhicule et sans ajout de pièces supplémentaires. The method according to the invention therefore makes it possible to avoid stalling of the engine only by means of the vehicle control laws and without the addition of additional parts.
En effet, l'unité de contrôle électronique prend en compte la température de l'huile du moteur plutôt que celle du liquide de refroidissement après le démarrage à froid du moteur, permettant ainsi d'éviter les pertes par frottement. Indeed, the electronic control unit takes into account the temperature of the engine oil rather than that of the coolant after the cold start of the engine, thus making it possible to avoid losses by friction.

Claims

REVENDICATIONS
1. Procédé de commande d'un système de motorisation d'un véhicule, notamment d'un véhicule automobile, le système de motorisation comprenant une chaudière pour chauffer un circuit de liquide de refroidissement avant le démarrage du système de motorisation, une unité de contrôle électronique exécutant le procédé de commande du système de motorisation pour contrôler le démarrage du moteur, et un circuit d'huile, caractérisé en ce que ledit procédé de commande comprend : 1. Method for controlling a motorization system of a vehicle, in particular of a motor vehicle, the motorization system comprising a boiler for heating a coolant circuit before starting the motorization system, a control unit electronics executing the motor system control method for controlling engine starting, and an oil circuit, characterized in that said control method comprises:
la mesure de la température du liquide de refroidissement (1) et la mesure de la température de l'huile du moteur (2), measuring the coolant temperature (1) and measuring the engine oil temperature (2),
la comparaison de l'écart de température entre la température du liquide de refroidissement (1) et la température de l'huile du moteur (2) vis-à-vis d'un seuil de température calibrable (3) en fonction des pertes par frottement du moteur, comparison of the temperature difference between the temperature of the coolant (1) and the temperature of the engine oil (2) with respect to a calibrated temperature threshold (3) as a function of losses by engine friction,
si, après démarrage du système de motorisation, l'écart de température entre la température du liquide de refroidissement (1) et la température de l'huile du moteur (2) est supérieur audit seuil de température calibrable (3), la mise en oeuvre d'une loi de commande comprenant un vecteur de consigne de régime moteur déterminant la sortie de démarrage (10) qui est fonction de la température de l'huile (2), et if, after starting the engine system, the temperature difference between the temperature of the coolant (1) and the temperature of the engine oil (2) is greater than said calibrable temperature threshold (3), work of a control law comprising an engine speed setpoint vector determining the starting output (10) which is a function of the oil temperature (2), and
si, après démarrage du système de motorisation, l'écart de température entre la température du liquide de refroidissement (1) et la température de l'huile du moteur (2) est inférieur audit seuil de température calibrable (3), la mise en oeuvre d'une loi de commande comprenant un vecteur de consigne de régime moteur déterminant la sortie de démarrage (10) qui est fonction de la température du liquide de refroidissement (1). if, after starting the engine system, the temperature difference between the temperature of the coolant (1) and the temperature of the engine oil (2) is less than said calibrable temperature threshold (3), work of a control law comprising an engine speed setpoint vector determining the starting output (10) which is a function of the temperature of the coolant (1).
2. Procédé de commande d'un système de motorisation d'un véhicule selon la revendication 1, caractérisé en ce que 2. Method for controlling a motorization system of a vehicle according to claim 1, characterized in that
si, après démarrage du système de motorisation, l'écart de température entre la température du liquide de refroidissement (1) et la température de l'huile du moteur (2) est inférieur audit seuil de température calibrable (3), une loi de commande détermine un vecteur d'initialisation de consigne de couple (13) qui est fonction de la température de l'huile du moteur (2), et if, after starting the engine system, the temperature difference between the temperature of the coolant (1) and the temperature of the engine oil (2) is less than said calibrable temperature threshold (3), a law of command determines a torque setpoint initialization vector (13) which is a function of the engine oil temperature (2), and
si, après démarrage du système de motorisation, l'écart de température entre la température du liquide de refroidissement (1) et la température de l'huile (2) est inférieur audit seuil de température calibrable (3), la mise en oeuvre d'une loi de commande comprenant un vecteur d'initialisation de consigne de couple (13) qui est fonction de la température du liquide de refroidissement (1). if, after starting the motorization system, the temperature difference between the temperature of the coolant (1) and the oil temperature (2) is less than said calibrable temperature threshold (3), the implementation of a control law comprising a torque setpoint initialization vector (13) which is a function of the temperature of the coolant (1).
3. Procédé de commande d'un système de motorisation d'un véhicule selon la revendication précédente comprenant une étape d'enregistrement de la valeur d'un ensemble d'éléments qui participent au contrôle du couple efficace produit par le moteur dans la mémoire de l'unité de contrôle électronique. 3. Method for controlling a motorization system of a vehicle according to the preceding claim comprising a step of recording the value of a set of elements which participate in the control of the effective torque produced by the engine in the memory of the electronic control unit.
4. Procédé de commande d'un système de motorisation d'un véhicule selon l'une des revendications précédentes, comprenant la réalisation d'une cartographie des températures et du régime du moteur, pour déterminer le seuil de température calibrable (3) en fonction des pertes par frottement du moteur. 4. Method for controlling a motorization system of a vehicle according to one of the preceding claims, comprising carrying out a map of the temperatures and of the engine speed, in order to determine the calibrated temperature threshold (3) as a function engine friction losses.
5. Procédé de commande d'un système de motorisation d'un véhicule selon la revendication précédente, caractérisé en ce que la cartographie est indexée selon la température de l'huile du moteur (2). 5. Method for controlling a motorization system of a vehicle according to the preceding claim, characterized in that the mapping is indexed according to the temperature of the engine oil (2).
6. Procédé de commande d'un système de motorisation d'un véhicule selon les revendications précédentes dans lequel l'écart de température entre la température du liquide de refroidissement (1) et la température de l'huile du moteur (2) supérieur audit seuil de température calibrable (3) est déterminé par la génération d'un code (8) par l'unité de contrôle électronique. 6. A method of controlling a motorization system of a vehicle according to the preceding claims wherein the temperature difference between the temperature of the coolant (1) and the temperature of the engine oil (2) greater than said calibrable temperature threshold (3) is determined by the generation of a code (8) by the electronic control unit.
7. Procédé de commande d'un système de motorisation d'un véhicule selon les revendications précédentes dans lequel l'écart de température entre la température du liquide de refroidissement (1) et la température de l'huile du moteur (2) inférieur audit seuil de température calibrable (3) est déterminé par la génération d'un code (9) par l'unité de contrôle électronique. 7. A method of controlling a motorization system of a vehicle according to the preceding claims wherein the temperature difference between the temperature of the coolant (1) and the temperature of the engine oil (2) lower than said calibrable temperature threshold (3) is determined by the generation of a code (9) by the electronic control unit.
8. Unité de contrôle électronique pour un système de motorisation d'un véhicule, configurée pour mettre en oeuvre le procédé de commande d'un système de motorisation d'un véhicule selon l'une des revendications précédentes. 8. Electronic control unit for a motorization system of a vehicle, configured to implement the method for controlling a motorization system of a vehicle according to one of the preceding claims.
9. Véhicule automobile comprenant une unité de contrôle électronique selon la revendication précédente. 9. Motor vehicle comprising an electronic control unit according to the preceding claim.
EP19823803.2A 2018-12-10 2019-11-19 Method for heating the cooling liquid of an internal combustion engine after a cold start Active EP3894684B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1872575A FR3089563B1 (en) 2018-12-10 2018-12-10 METHOD OF HEATING THE COOLANT OF AN INTERNAL COMBUSTION ENGINE AFTER A COLD START
PCT/FR2019/052755 WO2020120852A1 (en) 2018-12-10 2019-11-19 Method for heating the liquid coolant of an internal combustion engine after a cold start

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EP3894684B1 EP3894684B1 (en) 2023-01-18

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US7277791B2 (en) * 2005-10-19 2007-10-02 International Engine Intellectual Property Company, Llc Strategy for detecting use of a block heater and for modifying temperature-dependent variables to account for its use
JP4897715B2 (en) * 2008-01-28 2012-03-14 ヤンマー株式会社 Diesel engine control device
DE102008015283B3 (en) 2008-03-20 2009-09-03 Continental Automotive Gmbh Method and control device for starting an internal combustion engine, which has a heating device for heating a cooling liquid
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