EP3350430B1 - Method for determining a substitution temperature of the coolant liquid of a heat engine equipped with an additional heater - Google Patents

Method for determining a substitution temperature of the coolant liquid of a heat engine equipped with an additional heater Download PDF

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Publication number
EP3350430B1
EP3350430B1 EP16775787.1A EP16775787A EP3350430B1 EP 3350430 B1 EP3350430 B1 EP 3350430B1 EP 16775787 A EP16775787 A EP 16775787A EP 3350430 B1 EP3350430 B1 EP 3350430B1
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EP
European Patent Office
Prior art keywords
temperature
additional heater
substitution
heat engine
determining
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EP16775787.1A
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German (de)
French (fr)
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EP3350430A1 (en
Inventor
Cyril BYKOFF
Stephane Guichard
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PSA Automobiles SA
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PSA Automobiles SA
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Publication of EP3350430A1 publication Critical patent/EP3350430A1/en
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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
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/20—Indicating devices; Other safety devices concerning atmospheric freezing conditions, e.g. automatically draining or heating during frosty weather
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2037/00—Controlling
    • F01P2037/02—Controlling starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/18—Heater
    • 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
    • F02D2200/022—Estimation of 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
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • F02D41/086—Introducing corrections for particular operating conditions for idling taking into account the temperature of the engine

Definitions

  • the invention relates to a method for determining a substitution temperature of the coolant of a heat engine equipped with an additional heater, as well as to the program allowing the implementation of this method.
  • Vehicles intended to be marketed in very cold countries are generally equipped with an additional heater capable of heating the passenger compartment of the vehicle by programming a departure time some time before the vehicle is started.
  • an additional heater capable of heating the passenger compartment of the vehicle by programming a departure time some time before the vehicle is started.
  • the comfort of the user is greatly improved, since he enters a vehicle whose temperature of the passenger compartment has been warmed up before his arrival.
  • Such an additional heater 1 is connected to the cooling circuit 80 of the engine 10 of the vehicle, as illustrated in the diagram of the figure 1 . More specifically, this diagram represents a heat engine 10 and its cooling circuit 80 in which a coolant circulates.
  • a radiator 6 makes it possible to dissipate the heat of the engine 10 into the air and a degassing means 7 makes it possible to remove the air bubbles which may be present in the cooling circuit 80.
  • the coolant is pumped into a tank then introduced into the cooling circuit 80 via a collector.
  • a so-called water outlet box 5, equipped with a temperature sensor 50, allows the liquid to be reintroduced into the circuit 80 via the collector.
  • the driver of the vehicle will determine the departure time, that is to say the time at which he wants the passenger compartment to be at a suitable temperature, after a long stop of the vehicle and in very cold temperatures (below -10 ° C).
  • the additional heater 1, connected to the cooling circuit 80, will then start several minutes before the scheduled start time, thereby increasing the temperature of the coolant.
  • the air heater or water / air exchanger 4 can then recover this heat and send it back to the passenger compartment via a blower.
  • This heater 1 is used when the vehicle is immobilized during a period of extreme cold, for example overnight at very negative temperatures, of the order of -10 ° C to -35 ° C for example, and the driver wishes find a heated passenger compartment before entering your vehicle.
  • the additional heater 1 is programmed so that the passenger compartment is at a comfortable temperature at one hour prerecorded when the predetermined extreme cold conditions are met.
  • the additional heater 1 uses only part of the cooling circuit 80. Indeed, a solenoid valve 2 as well as a non-return valve 3 allow the liquid to circulate on a short hot loop shown diagrammatically by the arrows on the figure 1 .
  • conduits constituting the unused part of the cooling circuit 80 during the activation of the additional heater 1 are marked with a cross on the diagram of the figure 1 . They include the motor 10 which remains cold and define a long loop separated from the short loop by the solenoid valve 2.
  • the temperature sensor 50 therefore acquires an erroneous coolant temperature Tm with respect to a coolant temperature supposed to represent the overall thermal state of the heat engine 10.
  • Tm erroneous temperature
  • the invention thus allows the engine control not to be subjected to the harmful influence of the additional heater on the value used of the temperature of the coolant. Instabilities and non-starts are therefore eliminated.
  • the cost of implementing the invention is limited, insofar as it only requires software adaptation but no organic modification of the engine cooling circuit.
  • This solution is also compatible with any additional heater system equipped with a solenoid valve for separation between the long loop and the short loop.
  • said heating profiles are produced on the basis of tests at extreme temperatures of use of said additional heater.
  • the maps depend on a duration of activation of said additional heater as well as a time elapsed from the stopping of said additional heater.
  • a temperature loopback is carried out to converge towards the substitution temperature on which the weighting coefficient depends.
  • said loopback is initialized at the measured temperature.
  • said weighting coefficient is corrected using a mapping.
  • the method further comprises a step of determining information allowing the selection of the substitution temperature or of the measured temperature to be transmitted to said engine computer as a function of the operating state of the additional heater.
  • the invention makes it possible to indicate to the engine computer that an additional heater has been used and that the substitution temperature should be used rather than the measured temperature in order to disseminate this information as being the temperature representative of the state. engine thermal.
  • the subject of the invention is also a program comprising software instructions for implementing the method for determining a temperature for replacing a coolant at a measured temperature as defined above, when said program is executed by a processor.
  • an additional heater 1 in connection with the cooling circuit 80 of a heat engine 10, allows a driver to find a heated passenger compartment before entering his vehicle.
  • This heater 1 is used when the vehicle is immobilized during a period of extreme cold, for example overnight at very negative temperatures, of the order of -10 ° C to -35 ° C for example.
  • the additional heater 1 is programmed so that the passenger compartment is at a comfortable temperature at a pre-recorded time.
  • the additional heater 1 When the additional heater 1 is activated, it uses only part of the cooling circuit 80. Indeed, a solenoid valve 2 as well as a non-return valve 3 allow the liquid to circulate on a short hot loop shown diagrammatically by the arrows on the figure 1 .
  • the conduits constituting the unused part of the cooling circuit 80 during the activation of the additional heater 1 are marked with a cross on the diagram of the figure 1 . They include the motor 10 which remains cold and define a long loop separated from the short loop by the solenoid valve 2.
  • the activation of the heater 1 generates an increase in the temperature of the liquid in the long loop by thermal conduction.
  • the temperature sensor 50 therefore acquires an erroneous coolant temperature Tm with respect to a coolant temperature supposed to represent the overall thermal state of the heat engine 10, which gives rise to problems when the engine is driven.
  • the method according to the invention consists in calculating a substitution temperature Ts at a measured temperature Tm.
  • the substitution temperature Ts corresponds to the temperature of the coolant before the additional heater 1 is put into operation. substitution temperature Ts is then diffused towards the engine computer as being the temperature representative of the thermal state of the engine 10.
  • the figure 2 is a representation of the functions of a processing chain 100 which implements the method for determining the substitution temperature Ts of the coolant when an additional heater 1 has been used before starting the heat engine 10.
  • the calculation of the substitution temperature Ts is based on information returned by the additional heater 1 concerning its activation history.
  • a stopwatch measures its duration of activation Dact, as well as the duration that elapses from its stop Dstop. Then, when a user enters the vehicle, this information, as well as the temperature of the liquid Tm measured by the sensor 50 located in the water outlet housing 5, are transmitted to the processing chain 100, for the calculation of the substitution temperature Ts of the coolant.
  • Each of the two curves P1, P2 is integrated into a separate map C1, C2 allowing, for these two extreme temperatures (-12 ° C and -34 ° C), to know the difference ⁇ T between the temperature measured Tm by the sensor 50 and the substitution temperature Ts.
  • a weighting is performed in order to interpolate between the two extreme curves P1, P2.
  • the weighting coefficient Cp can be corrected by a C3 map.
  • the weighting coefficient Cp depends on the substitution temperature Ts, but as this is not yet known, a loopback is carried out in order to rapidly converge towards the substitution temperature Ts which it is desired to determine.
  • the temperature loopback is made by the block 101 which initializes at the temperature Tm measured by the sensor 50.
  • the temperature difference ⁇ T subtracted from the measured temperature Tm is thus determined from a barycenter of data from the C1, C2 maps weighted via weighting coefficients Cp coming from the C3 map.
  • a selection step is provided in the processing chain 200 in order to indicate that when an additional heater 1 has been used, the substitution temperature Ts should be used rather than the temperature Tm coming from the sensor 50.
  • l selection step makes it possible to indicate when it is relevant to use the substitution temperature Ts instead of the temperature Tm read by the sensor 50.
  • a functional block 102 allowing the implementation of this selection step , will keep the value "true” for a few seconds after the vehicle has started when it receives activation information from the heater 1. This will allow the processing chain 200 to switch from one temperature to the other Tm, Ts, in order to distribute reliable information on the thermal state of the engine 10 to the engine computer at all times.
  • An alternative embodiment could consist in placing the sensor 50 for measuring the temperature of the liquid at a greater distance from the additional heater 1, which would greatly reduce the influence of the heater 1 on the acquisition of temperatures.
  • Another alternative embodiment could consist in installing an additional sensor dedicated to this life situation.
  • these two variants are much more expensive than the implementation of the invention insofar as they imply a modification of the cooling circuit 80 as a whole or the addition of a sensor as well as its wiring, and its processing. .
  • the subject of the invention is also a program comprising software instructions for implementing the method for determining a temperature of substitution of a coolant at a measured temperature as defined above, when said program is executed by a processor.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Air-Conditioning For Vehicles (AREA)

Description

L'invention porte sur un procédé de détermination d'une température de substitution du liquide de refroidissement d'un moteur thermique équipé d'un réchauffeur additionnel, ainsi que sur le programme permettant la mise en œuvre de ce procédé.The invention relates to a method for determining a substitution temperature of the coolant of a heat engine equipped with an additional heater, as well as to the program allowing the implementation of this method.

Les véhicules destinés à être commercialisés dans des pays très froids sont généralement équipés d'un réchauffeur additionnel apte à réchauffer l'habitacle du véhicule par programmation d'une heure de départ quelques temps avant la mise en marche du véhicule. Ainsi, le confort de l'utilisateur est grandement amélioré, puisqu'il rentre dans un véhicule dont la température de l'habitacle a été réchauffée avant son arrivée.Vehicles intended to be marketed in very cold countries are generally equipped with an additional heater capable of heating the passenger compartment of the vehicle by programming a departure time some time before the vehicle is started. Thus, the comfort of the user is greatly improved, since he enters a vehicle whose temperature of the passenger compartment has been warmed up before his arrival.

Un tel réchauffeur additionnel 1 est branché sur le circuit de refroidissement 80 du moteur thermique 10 du véhicule, tel qu'illustré sur le schéma de la figure 1. Plus précisément, ce schéma représente un moteur thermique 10 et son circuit de refroidissement 80 dans lequel circule un liquide de refroidissement. Un radiateur 6 permet de dissiper dans l'air la chaleur du moteur 10 et un moyen de dégazage 7 permet d'évacuer les bulles d'air qui peuvent être présentes dans le circuit de refroidissement 80. Le liquide de refroidissement est pompé dans un réservoir puis introduit dans le circuit de refroidissement 80 par l'intermédiaire d'un collecteur. Un boîtier dit de sortie d'eau 5, équipé d'un capteur de température 50, permet de réintroduire le liquide dans le circuit 80 via le collecteur. Le conducteur du véhicule va déterminer l'heure de départ c'est-à-dire l'heure à laquelle il souhaite que l'habitacle soit à une température convenable, après un long arrêt du véhicule et par des températures très froides (en dessous de -10°C). Le réchauffeur additionnel 1, branché sur le circuit de refroidissement 80, se mettra alors en marche plusieurs minutes avant l'heure de départ programmée, augmentant ainsi la température du liquide de refroidissement. L'aérotherme ou échangeur eau/air 4 pourra alors récupérer cette chaleur et la renvoyer vers l'habitacle par l'intermédiaire d'un pulseur.Such an additional heater 1 is connected to the cooling circuit 80 of the engine 10 of the vehicle, as illustrated in the diagram of the figure 1 . More specifically, this diagram represents a heat engine 10 and its cooling circuit 80 in which a coolant circulates. A radiator 6 makes it possible to dissipate the heat of the engine 10 into the air and a degassing means 7 makes it possible to remove the air bubbles which may be present in the cooling circuit 80. The coolant is pumped into a tank then introduced into the cooling circuit 80 via a collector. A so-called water outlet box 5, equipped with a temperature sensor 50, allows the liquid to be reintroduced into the circuit 80 via the collector. The driver of the vehicle will determine the departure time, that is to say the time at which he wants the passenger compartment to be at a suitable temperature, after a long stop of the vehicle and in very cold temperatures (below -10 ° C). The additional heater 1, connected to the cooling circuit 80, will then start several minutes before the scheduled start time, thereby increasing the temperature of the coolant. The air heater or water / air exchanger 4 can then recover this heat and send it back to the passenger compartment via a blower.

Ce réchauffeur 1 est utilisé lorsque le véhicule est immobilisé pendant une période de grand froid, par exemple pendant une nuit à des températures très négatives, de l'ordre de -10°C à -35°C par exemple, et que le conducteur souhaite retrouver un habitacle réchauffé avant de pénétrer dans son véhicule. Dans ce cas, le réchauffeur additionnel 1 est programmé pour que l'habitacle soit à une température confortable à une heure préenregistrée lorsque les conditions de grand froid prédéterminées sont rencontrées. Lorsque le réchauffeur additionnel 1 est activé, il utilise uniquement une partie du circuit de refroidissement 80. En effet, une électrovanne 2 ainsi qu'un clapet anti retour 3 permettent au liquide de circuler sur une boucle courte chaude schématisée par les flèches sur la figure 1. Les conduits constituant la partie non utilisée du circuit de refroidissement 80 lors de l'activation du réchauffeur additionnel 1 sont marqués d'une croix sur le schéma de la figure 1. Ils englobent le moteur 10 qui reste froid et définissent une boucle longue séparée de la boucle courte par l'électrovanne 2.This heater 1 is used when the vehicle is immobilized during a period of extreme cold, for example overnight at very negative temperatures, of the order of -10 ° C to -35 ° C for example, and the driver wishes find a heated passenger compartment before entering your vehicle. In this case, the additional heater 1 is programmed so that the passenger compartment is at a comfortable temperature at one hour prerecorded when the predetermined extreme cold conditions are met. When the additional heater 1 is activated, it uses only part of the cooling circuit 80. Indeed, a solenoid valve 2 as well as a non-return valve 3 allow the liquid to circulate on a short hot loop shown diagrammatically by the arrows on the figure 1 . The conduits constituting the unused part of the cooling circuit 80 during the activation of the additional heater 1 are marked with a cross on the diagram of the figure 1 . They include the motor 10 which remains cold and define a long loop separated from the short loop by the solenoid valve 2.

Cependant, l'activation du réchauffeur 1 engendre une augmentation de la température du liquide dans la boucle longue par conduction thermique. Le capteur de température 50 acquiert donc une température du liquide de refroidissement erronée Tm par rapport à une température du liquide de refroidissement censée représenter l'état thermique global du moteur thermique 10.However, the activation of the heater 1 generates an increase in the temperature of the liquid in the long loop by thermal conduction. The temperature sensor 50 therefore acquires an erroneous coolant temperature Tm with respect to a coolant temperature supposed to represent the overall thermal state of the heat engine 10.

L'utilisation d'une telle température erronée Tm entraine des problèmes au démarrage du moteur 10 ainsi que pendant toute la durée de fonctionnement pendant laquelle le moteur 10 n'a pas encore atteint un état thermique stabilisé. Ces problèmes sont par exemple des problèmes liés à une mauvaise combustion, qui entraînent des à-coups, toussotements, voire même des calages du moteur 10, et génèrent également une surconsommation de carburant et par conséquent une élévation des émissions de particules polluantes.The use of such an erroneous temperature Tm causes problems when starting the engine 10 as well as during the entire operating time during which the engine 10 has not yet reached a stabilized thermal state. These problems are for example problems linked to poor combustion, which cause jolts, coughing, or even stalling of the engine 10, and also generate overconsumption of fuel and consequently an increase in emissions of polluting particles.

On connait des documents FR2996168A1 et FR2996253A1 un procédé de détermination d'une température de substitution du liquide de refroidissement conforme au préambule de la revendication 1.We know documents FR2996168A1 and FR2996253A1 a method for determining a substitution temperature for the coolant according to the preamble of claim 1.

L'invention vise à remédier efficacement à ces inconvénients en proposant un procédé de détermination d'une température de substitution à une température mesurée d'un liquide de refroidissement pour un pilotage d'un moteur thermique, ledit moteur thermique étant associé à un circuit de refroidissement en relation avec un réchauffeur additionnel, caractérisé en ce que, lorsque ledit réchauffeur additionnel a été utilisé préalablement au démarrage du moteur thermique, ledit procédé comporte :

  • une étape de calcul de ladite température de substitution comprenant :
    • une étape de calcul d'un écart de température à partir de cartographies intégrant les deux profils d'échauffement établis pour au moins deux températures d'utilisation dudit réchauffeur additionnel et d'un coefficient de pondération permettant l'interpolation des profils d'échauffement, et
    • une étape de soustraction dudit écart à ladite température mesurée, et
  • une étape de transmission à un calculateur moteur de ladite température de substitution pour assurer ledit pilotage du moteur thermique.
The invention aims to effectively remedy these drawbacks by proposing a method for determining a substitution temperature for a measured temperature of a coolant for controlling a heat engine, said heat engine being associated with a circuit for cooling in connection with an additional heater, characterized in that, when said additional heater has been used prior to starting the heat engine, said method comprises:
  • a step of calculating said substitution temperature comprising:
    • a step of calculating a temperature difference from maps integrating the two heating profiles established for at least two operating temperatures said additional heater and a weighting coefficient allowing the interpolation of the heating profiles, and
    • a step of subtracting said deviation from said measured temperature, and
  • a step of transmitting said substitution temperature to an engine computer to ensure said control of the heat engine.

L'invention permet ainsi au pilotage moteur de ne pas subir l'influence néfaste du réchauffeur additionnel sur la valeur utilisée de la température du liquide de refroidissement. Les instabilités et les non-démarrages sont donc supprimés. Le coût de mise en œuvre de l'invention est limité, dans la mesure où elle nécessite uniquement une adaptation logicielle mais aucune modification organique du circuit de refroidissement du moteur. Cette solution est en outre compatible avec tout système de réchauffeur additionnel équipé d'une électrovanne de séparation entre la boucle longue et la boucle courte.The invention thus allows the engine control not to be subjected to the harmful influence of the additional heater on the value used of the temperature of the coolant. Instabilities and non-starts are therefore eliminated. The cost of implementing the invention is limited, insofar as it only requires software adaptation but no organic modification of the engine cooling circuit. This solution is also compatible with any additional heater system equipped with a solenoid valve for separation between the long loop and the short loop.

Selon une mise en œuvre, lesdits profils d'échauffement sont réalisés sur la base d'essais à des températures extrêmes d'utilisation dudit réchauffeur additionnel.According to one implementation, said heating profiles are produced on the basis of tests at extreme temperatures of use of said additional heater.

Selon une mise en œuvre, les cartographies dépendent d'une durée d'activation dudit réchauffeur additionnel ainsi que d'une durée écoulée à partir de l'arrêt dudit réchauffeur additionnel.According to one implementation, the maps depend on a duration of activation of said additional heater as well as a time elapsed from the stopping of said additional heater.

Selon une mise en œuvre, un rebouclage de température est effectué pour converger vers la température de substitution dont dépend le coefficient de pondération.According to one implementation, a temperature loopback is carried out to converge towards the substitution temperature on which the weighting coefficient depends.

Selon une mise en œuvre, ledit rebouclage est initialisé à la température mesurée.According to one implementation, said loopback is initialized at the measured temperature.

Selon une mise en œuvre, ledit coefficient de pondération est corrigé à l'aide d'une cartographie.According to one implementation, said weighting coefficient is corrected using a mapping.

Selon une mise en œuvre, le procédé comporte en outre une étape de détermination d'une information permettant la sélection de la température de substitution ou de la température mesurée à transmettre audit calculateur moteur en fonction de l'état de fonctionnement du réchauffeur additionnel. Ainsi l'invention permet d'indiquer au calculateur moteur qu'un réchauffeur additionnel a été utilisé et qu'il convient d'utiliser la température de substitution plutôt que la température mesurée afin de diffuser cette information comme étant la température représentative de l'état thermique du moteur.According to one implementation, the method further comprises a step of determining information allowing the selection of the substitution temperature or of the measured temperature to be transmitted to said engine computer as a function of the operating state of the additional heater. Thus, the invention makes it possible to indicate to the engine computer that an additional heater has been used and that the substitution temperature should be used rather than the measured temperature in order to disseminate this information as being the temperature representative of the state. engine thermal.

L'invention a également pour objet un programme comportant des instructions logicielles pour la mise en œuvre du procédé de détermination d'une température de substitution d'un liquide de refroidissement à une température mesurée tel que défini précédemment, lorsque ledit programme est exécuté par un processeur.The subject of the invention is also a program comprising software instructions for implementing the method for determining a temperature for replacing a coolant at a measured temperature as defined above, when said program is executed by a processor.

L'invention sera mieux comprise à la lecture de la description qui suit et à l'examen des figures qui l'accompagnent. Ces figures ne sont données qu'à titre illustratif mais nullement limitatif de l'invention.

  • La figure 1, déjà décrite, est une représentation schématique simplifiée d'un moteur thermique associé à un circuit de refroidissement en relation avec un réchauffeur additionnel;
  • La figure 2 est un diagramme des blocs fonctionnels d'une chaîne de traitement permettant la mise en œuvre du procédé de détermination d'une température de substitution du liquide de refroidissement selon la présente invention;
  • Les figures 3a et 3b sont des représentations graphiques de profils d'échauffement établis respectivement à -12°C et à -34°C pour un réchauffeur additionnel activé durant 30 minutes, ces profils illustrent l'augmentation de la température du liquide de refroidissement en fonction du temps.
The invention will be better understood on reading the description which follows and on examining the figures which accompany it. These figures are given only by way of illustration but in no way limit the invention.
  • The figure 1 , already described, is a simplified schematic representation of a heat engine associated with a cooling circuit in relation to an additional heater;
  • The figure 2 is a diagram of the functional blocks of a processing chain allowing the implementation of the method for determining a substitution temperature of the coolant according to the present invention;
  • The Figures 3a and 3b are graphical representations of heating profiles established respectively at -12 ° C and -34 ° C for an additional heater activated for 30 minutes, these profiles illustrate the increase in the temperature of the coolant as a function of time.

Comme cela est illustré par la figure 1, un réchauffeur additionnel 1, en relation avec le circuit de refroidissement 80 d'un moteur thermique 10, permet à un conducteur de retrouver un habitacle réchauffé avant de pénétrer dans son véhicule. Ce réchauffeur 1 est utilisé lorsque le véhicule est immobilisé pendant une période de grand froid, par exemple pendant une nuit à des températures très négatives, de l'ordre de -10°C à -35°C par exemple. Dans ce cas, le réchauffeur additionnel 1 est programmé pour que l'habitacle soit à une température confortable à une heure préenregistrée.As illustrated by the figure 1 , an additional heater 1, in connection with the cooling circuit 80 of a heat engine 10, allows a driver to find a heated passenger compartment before entering his vehicle. This heater 1 is used when the vehicle is immobilized during a period of extreme cold, for example overnight at very negative temperatures, of the order of -10 ° C to -35 ° C for example. In this case, the additional heater 1 is programmed so that the passenger compartment is at a comfortable temperature at a pre-recorded time.

Lorsque le réchauffeur additionnel 1 est activé, il utilise uniquement une partie du circuit de refroidissement 80. En effet, une électrovanne 2 ainsi qu'un clapet anti retour 3 permettent au liquide de circuler sur une boucle courte chaude schématisée par les flèches sur la figure 1. Les conduits constituant la partie non utilisée du circuit de refroidissement 80 lors de l'activation du réchauffeur additionnel 1 sont marqués d'une croix sur le schéma de la figure 1. Ils englobent le moteur 10 qui reste froid et définissent une boucle longue séparée de la boucle courte par l'électrovanne 2.When the additional heater 1 is activated, it uses only part of the cooling circuit 80. Indeed, a solenoid valve 2 as well as a non-return valve 3 allow the liquid to circulate on a short hot loop shown diagrammatically by the arrows on the figure 1 . The conduits constituting the unused part of the cooling circuit 80 during the activation of the additional heater 1 are marked with a cross on the diagram of the figure 1 . They include the motor 10 which remains cold and define a long loop separated from the short loop by the solenoid valve 2.

Cependant, l'activation du réchauffeur 1 engendre une augmentation de la température du liquide dans la boucle longue par conduction thermique. Le capteur de température 50 acquiert donc une température du liquide de refroidissement erronée Tm par rapport à une température du liquide de refroidissement censée représenter l'état thermique global du moteur thermique 10, ce qui engendre des problèmes lors du pilotage du moteur. Pour éviter de tels problèmes, le procédé selon l'invention consiste à calculer une température de substitution Ts à une température mesurée Tm. La température de substitution Ts correspond à la température du liquide de refroidissement avant la mise en fonctionnement du réchauffeur additionnel 1. Cette température de substitution Ts est ensuite diffusée vers le calculateur moteur comme étant la température représentative de l'état thermique du moteur 10.However, the activation of the heater 1 generates an increase in the temperature of the liquid in the long loop by thermal conduction. The temperature sensor 50 therefore acquires an erroneous coolant temperature Tm with respect to a coolant temperature supposed to represent the overall thermal state of the heat engine 10, which gives rise to problems when the engine is driven. To avoid such problems, the method according to the invention consists in calculating a substitution temperature Ts at a measured temperature Tm. The substitution temperature Ts corresponds to the temperature of the coolant before the additional heater 1 is put into operation. substitution temperature Ts is then diffused towards the engine computer as being the temperature representative of the thermal state of the engine 10.

La figure 2 est une représentation des fonctions d'une chaîne de traitement 100 qui met en œuvre le procédé de détermination de la température de substitution Ts du liquide de refroidissement lorsqu'un réchauffeur additionnel 1 a été utilisé préalablement au démarrage du moteur thermique 10.The figure 2 is a representation of the functions of a processing chain 100 which implements the method for determining the substitution temperature Ts of the coolant when an additional heater 1 has been used before starting the heat engine 10.

Le calcul de la température de substitution Ts se base sur des informations renvoyées par le réchauffeur additionnel 1 concernant son historique d'activation. En effet, lorsque le réchauffeur 1 est activé, un chronomètre mesure sa durée d'activation Dact, ainsi que la durée qui s'écoule à partir de son arrêt Dstop. Puis, lorsqu'un utilisateur entre dans le véhicule, ces informations, ainsi que la température du liquide Tm mesurée par le capteur 50 situé dans le boîtier de sortie d'eau 5, sont transmises à la chaîne de traitement 100, pour le calcul de la température de substitution Ts du liquide de refroidissement.The calculation of the substitution temperature Ts is based on information returned by the additional heater 1 concerning its activation history. In fact, when the heater 1 is activated, a stopwatch measures its duration of activation Dact, as well as the duration that elapses from its stop Dstop. Then, when a user enters the vehicle, this information, as well as the temperature of the liquid Tm measured by the sensor 50 located in the water outlet housing 5, are transmitted to the processing chain 100, for the calculation of the substitution temperature Ts of the coolant.

Par ailleurs, des essais d'utilisation du réchauffeur additionnel 1 muni de l'électrovanne 2 et du clapet anti retour 3 ont été réalisés sur un véhicule. Ces essais ont montré que la température Tm du liquide de refroidissement lue par le capteur 50 subissait un échauffement lié à la durée d'activation Dact du réchauffeur 1 et à la durée après activation Dstop du réchauffeur 1. Les profils d'échauffement du liquide de refroidissement obtenus lors des essais sont différents en fonction de la température extérieure. Les graphiques des figures 3a et 3b représentent les profils d'échauffement P1, P2 aux températures extrêmes d'utilisation du réchauffeur additionnel 1. Ces températures extrêmes sont fixées à -12°C et -34°C pour cet exemple de réalisation. Chacune des deux courbes P1, P2 est intégrée dans une cartographie distincte C1, C2 permettant, pour ces deux températures extrêmes (-12°C et -34°C), de connaitre l'écart ΔT entre la température mesurée Tm par le capteur 50 et la température de substitution Ts.Furthermore, tests of use of the additional heater 1 provided with the solenoid valve 2 and the non-return valve 3 were carried out on a vehicle. These tests have shown that the temperature Tm of the coolant read by the sensor 50 undergoes heating linked to the activation time Dact of the heater 1 and to the time after activation Dstop of the heater 1. The heating profiles of the coolant cooling obtained during the tests are different depending on the outside temperature. The graphics of Figures 3a and 3b represent the heating profiles P1, P2 at the extreme temperatures of use of the additional heater 1. These extreme temperatures are fixed at -12 ° C and -34 ° C for this exemplary embodiment. Each of the two curves P1, P2 is integrated into a separate map C1, C2 allowing, for these two extreme temperatures (-12 ° C and -34 ° C), to know the difference ΔT between the temperature measured Tm by the sensor 50 and the substitution temperature Ts.

Pour toutes les températures intermédiaires (]-12°C;-34°C[), une pondération est réalisée afin d'interpoler entre les deux courbes extrêmes P1, P2. Le coefficient de pondération Cp peut être corrigé par une cartographie C3. Le coefficient de pondération Cp dépend de la température de substitution Ts, mais celle-ci n'étant pas encore connue, un rebouclage est effectué afin de converger rapidement vers la température de substitution Ts que l'on souhaite déterminer. Le rebouclage de température est fait par le bloc 101 qui s'initialise à la température Tm mesurée par le capteur 50.For all intermediate temperatures (] -12 ° C; -34 ° C [), a weighting is performed in order to interpolate between the two extreme curves P1, P2. The weighting coefficient Cp can be corrected by a C3 map. The weighting coefficient Cp depends on the substitution temperature Ts, but as this is not yet known, a loopback is carried out in order to rapidly converge towards the substitution temperature Ts which it is desired to determine. The temperature loopback is made by the block 101 which initializes at the temperature Tm measured by the sensor 50.

L'écart de température ΔT soustrait à la température mesurée Tm est ainsi déterminé à partir d'un barycentre de données issues des cartographies C1, C2 pondérées via des coefficients de pondération Cp provenant de la cartographie C3.The temperature difference ΔT subtracted from the measured temperature Tm is thus determined from a barycenter of data from the C1, C2 maps weighted via weighting coefficients Cp coming from the C3 map.

Une étape de sélection est prévue dans chaîne de traitement 200 afin d'indiquer que lorsqu'un réchauffeur additionnel 1 a été utilisé, il convient d'utiliser la température de substitution Ts plutôt que la température Tm issue du capteur 50. Autrement dit, l'étape de sélection permet d'indiquer quand il est pertinent d'utiliser la température de substitution Ts à la place de la température Tm lue par le capteur 50. Pour cela un bloc fonctionnel 102, permettant la mise en œuvre de cette étape de sélection, conservera la valeur « vraie » pendant quelques secondes après le démarrage du véhicule lorsqu'il reçoit des informations d'activation du réchauffeur 1. Ceci permettra à la chaîne de traitement 200 de basculer d'une température à l'autre Tm, Ts, afin de diffuser au calculateur moteur une information fiable de l'état thermique du moteur 10 à tout instant.A selection step is provided in the processing chain 200 in order to indicate that when an additional heater 1 has been used, the substitution temperature Ts should be used rather than the temperature Tm coming from the sensor 50. In other words, l selection step makes it possible to indicate when it is relevant to use the substitution temperature Ts instead of the temperature Tm read by the sensor 50. For this, a functional block 102, allowing the implementation of this selection step , will keep the value "true" for a few seconds after the vehicle has started when it receives activation information from the heater 1. This will allow the processing chain 200 to switch from one temperature to the other Tm, Ts, in order to distribute reliable information on the thermal state of the engine 10 to the engine computer at all times.

Une variante de réalisation pourrait consister à placer le capteur de mesure 50 de la température du liquide à une plus grande distance du réchauffeur additionnel 1, ce qui permettrait de réduire fortement l'influence du réchauffeur 1 sur l'acquisition des températures. Une autre variante de réalisation pourrait consister à implanter un capteur supplémentaire dédié à cette situation de vie. Toutefois, ces deux variantes sont nettement plus onéreuses que la mise en œuvre de l'invention dans la mesure où elles impliquent une modification du circuit de refroidissement 80 dans sa globalité ou l'ajout d'un capteur ainsi que son câblage, et son traitement.An alternative embodiment could consist in placing the sensor 50 for measuring the temperature of the liquid at a greater distance from the additional heater 1, which would greatly reduce the influence of the heater 1 on the acquisition of temperatures. Another alternative embodiment could consist in installing an additional sensor dedicated to this life situation. However, these two variants are much more expensive than the implementation of the invention insofar as they imply a modification of the cooling circuit 80 as a whole or the addition of a sensor as well as its wiring, and its processing. .

L'invention a également pour objet un programme comportant des instructions logicielles pour la mise en œuvre du procédé de détermination d'une température de substitution d'un liquide de refroidissement à une température mesurée tel que défini précédemment, lorsque ledit programme est exécuté par un processeur.The subject of the invention is also a program comprising software instructions for implementing the method for determining a temperature of substitution of a coolant at a measured temperature as defined above, when said program is executed by a processor.

Claims (8)

  1. A method for determining a substitution temperature (Ts) for substituting a coolant liquid at a measured temperature (Tm) in order to control a heat engine (10), said heat engine (10) being associated with a cooling circuit (80) in relation with an additional heater (1),
    characterized in that, when said additional heater (1) has been used prior to the starting of the heat engine (10), said method comprises:
    - a step of calculating said substitution temperature (Ts) including:
    a step of calculating a pressure difference (ΔT) from maps (C1, C2) integrating the two heating profiles (P1, P2) established for at least two usage temperatures of said additional heater (1) and of a weighting coefficient (Cp) permitting the interpolation of the heating profiles (P1, P2), and
    a step of subtraction of said difference (ΔT) to said measured temperature (Tm), and
    - a step of transmission to an engine computer of said substitution temperature (Ts) to ensure said control of the heat engine.
  2. The method according to Claim 1, characterized in that said heating profiles (P1, P2) are realized on the basis of tests at extreme usage temperatures of said additional heater (1).
  3. The method according to Claim 1 or 2, characterized in that the maps (C2, C2) depend on an activation duration (Dact) of said additional heater (1) and an elapsed duration (Dstop) from the stoppage of said additional heater (1).
  4. The method according to any one of Claims 1 to 3, characterized in that a temperature loopback is carried out to converge towards the substitution temperature (Ts) on which the weighting coefficient (Cp) depends.
  5. The method according to Claim 4, characterized in that said loopback is initialized at the measured temperature (Tm).
  6. The method according to any one of Claims 1 to 5, characterized in that said weighting coefficient (Cp) is corrected by means of a map (C3).
  7. The method according to any one of Claims 1 to 6, characterized in that it further comprises a step of determining an item of information permitting the selection of the substitution temperature (Ts) or of the measured temperature (Tm) to transmit to said engine computer as a function of the operating state of the additional heater (1).
  8. A program comprising software instructions for the implementation of the method for determining a substitution temperature (Ts) for substituting a coolant liquid at a measured temperature (Tm) according to any one of the preceding claims, when said program is executed by a processor.
EP16775787.1A 2015-09-18 2016-09-06 Method for determining a substitution temperature of the coolant liquid of a heat engine equipped with an additional heater Active EP3350430B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1558787A FR3041377B1 (en) 2015-09-18 2015-09-18 METHOD FOR DETERMINING A TEMPERATURE OF SUBSTITUTING THE COOLANT OF A THERMAL MOTOR EQUIPPED WITH AN ADDITIONAL HEATER
PCT/FR2016/052206 WO2017046477A1 (en) 2015-09-18 2016-09-06 Method for determining a substitution temperature of the coolant liquid of a heat engine equipped with an additional heater

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EP3350430A1 EP3350430A1 (en) 2018-07-25
EP3350430B1 true EP3350430B1 (en) 2020-05-13

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CN111140357B (en) * 2019-12-26 2021-03-16 潍柴动力股份有限公司 Method and device for determining first starting temperature of engine and electronic equipment

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US7757649B2 (en) * 2007-06-04 2010-07-20 Denso Corporation Controller, cooling system abnormality diagnosis device and block heater determination device of internal combustion engine
KR101339257B1 (en) * 2012-09-24 2013-12-09 현대자동차 주식회사 System and method for cooling engine of vehicle
FR2996253B1 (en) * 2012-10-01 2014-10-10 Peugeot Citroen Automobiles Sa DEVICE FOR CALCULATING AN OIL TEMPERATURE MODEL FOR A THERMAL MOTOR EQUIPPED WITH AN ADDITIONAL HEATER
FR2996168B1 (en) * 2012-10-02 2014-10-10 Peugeot Citroen Automobiles Sa DEVICE FOR CALCULATING A TEMPERATURE OF SUBSTITUTING THE COOLANT OF A THERMAL MOTOR EQUIPPED WITH AN ADDITIONAL HEATER
US10371083B2 (en) * 2012-12-13 2019-08-06 GM Global Technology Operations LLC Systems and methods for fuel control during cold starts
FR3011100B1 (en) * 2013-09-24 2015-10-09 Peugeot Citroen Automobiles Sa METHOD FOR CONTROLLING THE OPERATION OF A COOLANT COOLING HEATER
EP2873826B1 (en) * 2013-11-15 2019-03-27 Volvo Car Corporation Heat storage in engine cooling system

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CN108124457A (en) 2018-06-05
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FR3041377B1 (en) 2017-10-06
EP3350430A1 (en) 2018-07-25
FR3041377A1 (en) 2017-03-24

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