EP3746647B1 - Degassing vessel for motor vehicle cooling circuit - Google Patents

Degassing vessel for motor vehicle cooling circuit Download PDF

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Publication number
EP3746647B1
EP3746647B1 EP19701366.7A EP19701366A EP3746647B1 EP 3746647 B1 EP3746647 B1 EP 3746647B1 EP 19701366 A EP19701366 A EP 19701366A EP 3746647 B1 EP3746647 B1 EP 3746647B1
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EP
European Patent Office
Prior art keywords
heating element
heat exchange
liquid
exchange circuit
jar
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EP19701366.7A
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German (de)
French (fr)
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EP3746647A1 (en
Inventor
Valentin MAZET
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Renault SAS
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Renault SAS
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    • 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
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/029—Expansion reservoirs
    • 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
    • F01P11/18—Indicating devices; Other safety devices concerning coolant pressure, coolant flow, or liquid-coolant level
    • 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
    • F01P2070/00—Details
    • F01P2070/04—Details using electrical heating elements

Definitions

  • the subject of the invention is fluid heat exchange circuits.
  • the boiling of a heat transfer fluid in such a circuit causes premature erosion of the fluid conduits of the circuit, resulting in a risk of liquid leakage.
  • the invention proposes rapid pressurization of the complete cooling circuit to limit the risk of boiling in the cooling circuit, in particular in the EGR exchangers, and therefore the need for coolant flow.
  • the document FROM 10 2011 108041 A1 presents such a solution.
  • the volume of gas is preferably configured to make it possible to absorb expansions of the liquid in the temperature range of use of said liquid.
  • the heat exchange circuit is advantageously further configured to be able to be closed with respect to the external environment so as to be sealed against said liquid and said gas, while allowing circulation of the liquid in a loop from the degassing jar to the jar degassing, preferably through at least one heat exchanger.
  • the degassing jar is equipped with a heating element, the heating element being placed so as to remain out of the liquid under the intended conditions of use, and being configured to allow the gas surmounting the liquid to be directly heated, preferably without be in contact with the liquid.
  • the heating element if the heating element does not remain entirely out of the liquid for the entire range of use of the exchange circuit, at least the heating element is configured for, over the range of use of the exchange circuit exchange, cause when activated, a more rapid rise in the temperature of the gas than it causes a rise in the temperature of the liquid circulating in the exchange circuit.
  • the heating element can typically comprise an electrical resistance, but other types of heating elements are possible, for example a heat exchanger with a second circulation of a second fluid.
  • the jar may include a closure cap in the upper part of the jar, the cap carrying the heating element.
  • At least one portion of the heating element is placed at a portion of the wall of the jar distinct from the cap.
  • the liquid pressure sensor is located closer to the heat exchanger than to the degassing tank.
  • the electronic control unit can be configured to activate the heating element when the pressure sensor transmits to it a measurement in deviation from a pressure setpoint value, or when boiling is detected via a predefined profile of pressure waves.
  • High frequency pressure waves can for example be indicative of the start of boiling of the liquid, which we wish to avoid, in order to limit erosion of the heat exchange circuit by cavitation.
  • the circuit may further include a liquid temperature sensor or estimator connected to the control unit.
  • the liquid pressure sensor is located closer to the heat exchanger than to the degassing tank.
  • the temperature estimator may include a temperature sensor, placed for example on the liquid circuit.
  • the electronic control unit can be configured to trigger heating by the heating element if a pair of values (pressure temperature) obtained using the temperature estimator and using the pressure sensor are found. on a predefined side of a recorded threshold curve, on the side of higher temperatures and lower pressures in relation to the threshold curve.
  • the threshold curve can correspond to a boiling threshold curve of the liquid.
  • the electronic control unit can be configured to, when activating the heating element, cause the sending of a constant heating power of a predefined level, for a predefined heating time.
  • the heating element can thus transmit a given quantity of energy before a new evaluation by the control unit, and before if necessary triggering the sending of another equivalent quantity of energy if the risk of boiling of the liquid remains effective.
  • the electronic control unit can be configured to estimate the position of a pair of values (pressure temperature) obtained using the temperature estimator and the using the pressure sensor, in relation to a map comprising a series of threshold curves or comprising a threshold surface, and the control unit can be configured to, upon activation of the heating element, cause the sending at least two different heating powers for at least two different positions of the point on the map.
  • the different heating powers can be obtained, on average, for example by sending several successive quantities of energy, each quantity corresponding to the supply of the heating element with the same electrical power for the same duration, the number of quantities and the time interval separating the quantities, being adapted to obtain on average the desired heating power.
  • the different heating powers can be obtained by powering the heating element, for a predefined duration, at an electrical power which is adapted as a function of the heating power determined from the mapping.
  • the invention also relates to a motor vehicle with a burnt gas recirculation system, the burnt gas recirculation system being cooled by a heat exchange circuit as described above.
  • a heat exchange circuit according to the invention comprises a heat exchanger 10 crossed by a liquid 8, which is brought by pipes 2, using a pump 14, from the heat exchanger 10 to a jar of degassing 3 of the circuit, then again towards the heat exchanger 10.
  • the liquid 8 passes through at least a second heat exchanger (not shown in the figures), in order to yield / respectively recover at least part of the calories stored / respectively released, at the level of the exchanger 10.
  • said second heat exchanger can be a unit heater which makes it possible to heat air blown towards the passenger compartment of the vehicle.
  • the jar 3 includes a closure cap 4.
  • the jar 3 is equipped with a heating element, designated by the reference 5 on the figure 1 .
  • the heating element is carried by the cap 4.
  • the heating element designated by the reference 6 on the figure 2
  • the heating element can be carried by the walls of the jar, above the level of the liquid 8.
  • the degassing jar is sized, and is placed in the thermal circuit so that the liquid 8 present in this jar is surmounted by a gaseous volume 9.
  • the heating element is connected to an electronic control unit 7 which triggers and/or regulates the electrical power supply to the heating element as a function of values, respectively P, T, delivered by a temperature sensor. pressure 11 and by a temperature sensor 12.
  • the Qcons setpoint sent by the electronic control unit 7 to the heating element 5, makes it possible to trigger an increase in temperature and pressure of the gas volume 9, therefore rapid pressurization liquid 8, in order to delay its boiling.
  • the electronic control unit 7 can for this purpose compare the values P, T to values recorded in a map 13, in order to determine whether the liquid 8 is in conditions close to boiling, or not.
  • the heat exchange circuit 1 may comprise a cooling circuit of a motor (motor not shown) which is connected to the heat exchanger 10. Consequently, the liquid 8 circulating in the degassing tank may be liquid circulating through the vehicle's engine to exchange calories.
  • the heat exchange circuit equipped with a degassing tank according to the invention makes it possible to tolerate use at a higher temperature of the heat transfer liquid, therefore to limit the flow rate thereof, which ultimately makes it possible to limit consumption. in fuel of the vehicle equipped with the heat exchange circuit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Description

L'invention a pour objet les circuits d'échanges thermiques par fluide. L'ébullition d'un fluide caloporteur dans un tel circuit provoque une érosion prématurée des conduits de fluide du circuit, d'où un risque de fuite de liquide. Il existe un besoin pour permettre de retarder l'ébullition d'un liquide caloporteur dans un tel circuit.The subject of the invention is fluid heat exchange circuits. The boiling of a heat transfer fluid in such a circuit causes premature erosion of the fluid conduits of the circuit, resulting in a risk of liquid leakage. There is a need to enable the boiling of a heat transfer liquid to be delayed in such a circuit.

Par exemple, il faut limiter l'ébullition du liquide de refroidissement dans les circuits de refroidissement des moteurs thermiques. De nombreux composants présents sur le circuit de refroidissement apportent localement beaucoup d'énergie thermique, ce qui augmente le risque d'ébullition. Un exemple est le système EGR (Exhaust Gas Recirculation) utilisé pour réduire la production de NOx (oxydes d'azote) lors de la combustion. Ce système EGR nécessite de refroidir les gaz d'échappement recirculés. Le risque d'ébullition dans les échangeurs thermiques est élevé, ce qui nécessite d'avoir des débits de liquide de refroidissement dans ces échangeurs conséquents. L'augmentation du débit accroît la consommation globale en énergie du véhicule, et sa consommation en carburant.For example, it is necessary to limit the boiling of the coolant in the cooling circuits of heat engines. Many components present on the cooling circuit provide a lot of thermal energy locally, which increases the risk of boiling. An example is the EGR (Exhaust Gas Recirculation) system used to reduce the production of NOx (nitrogen oxides) during combustion. This EGR system requires cooling the recirculated exhaust gases. The risk of boiling in heat exchangers is high, which requires significant coolant flow rates in these exchangers. The increase in flow rate increases the overall energy consumption of the vehicle, and its fuel consumption.

A cette fin, l'invention propose une mise sous pression rapide du circuit de refroidissement complet pour limiter le risque d'ébullition dans le circuit de refroidissement, en particulier dans les échangeurs EGR, et donc le besoin en débit de liquide de refroidissement. Le document DE 10 2011 108041 A1 présente un telle solution.To this end, the invention proposes rapid pressurization of the complete cooling circuit to limit the risk of boiling in the cooling circuit, in particular in the EGR exchangers, and therefore the need for coolant flow. The document FROM 10 2011 108041 A1 presents such a solution.

A cette fin un circuit d'échange thermique, peut comprendre :

  • un circuit de canalisations dans lesquelles circule un liquide destiné à transporter des calories en vue d'une régulation thermique ;
  • un bocal de dégazage connecté au circuit de canalisations, configuré pour réserver un volume d'expansion dans lequel ledit liquide se trouve surmonté d'un volume de gaz.
To this end, a heat exchange circuit may include:
  • a circuit of pipes in which a liquid circulates intended to transport calories for thermal regulation;
  • a degassing tank connected to the piping circuit, configured to reserve an expansion volume in which said liquid is surmounted by a volume of gas.

Le volume de gaz est de préférence configuré pour permettre d'absorber des dilatations du liquide dans la plage d'utilisation en température dudit liquide.The volume of gas is preferably configured to make it possible to absorb expansions of the liquid in the temperature range of use of said liquid.

Le circuit d'échange thermique est avantageusement en outre configuré pour pouvoir être fermé vis-à-vis du milieu extérieur de manière à être étanche audit liquide et audit gaz, tout en autorisation une circulation du liquide en boucle du bocal de dégazage vers le bocal de dégazage, de préférence au travers d'au moins un échangeur thermique.The heat exchange circuit is advantageously further configured to be able to be closed with respect to the external environment so as to be sealed against said liquid and said gas, while allowing circulation of the liquid in a loop from the degassing jar to the jar degassing, preferably through at least one heat exchanger.

Le bocal de dégazage est équipé d'un élément chauffant, l'élément chauffant étant placé de manière à rester hors du liquide dans les conditions prévues d'utilisation, et étant configuré pour permettre de chauffer directement le gaz surmontant le liquide, de préférence sans être en contact avec le liquide.The degassing jar is equipped with a heating element, the heating element being placed so as to remain out of the liquid under the intended conditions of use, and being configured to allow the gas surmounting the liquid to be directly heated, preferably without be in contact with the liquid.

Selon un mode de réalisation, si l'élément chauffant ne reste pas intégralement hors du liquide pour toute la plage d'utilisation du circuit d'échange, du moins l'élément chauffant est configuré pour, sur la plage d'utilisation du circuit d'échange, provoquer lorsqu'il est activé, une élévation plus rapide de la température du gaz qu'il ne provoque d'élévation de la température du liquide circulant dans le circuit d'échange.According to one embodiment, if the heating element does not remain entirely out of the liquid for the entire range of use of the exchange circuit, at least the heating element is configured for, over the range of use of the exchange circuit exchange, cause when activated, a more rapid rise in the temperature of the gas than it causes a rise in the temperature of the liquid circulating in the exchange circuit.

L'élément chauffant peut typiquement comprendre une résistance électrique, mais d'autres types d'éléments chauffant sont envisageable, par exemple un échangeur thermique avec une seconde circulation d'un second fluide.The heating element can typically comprise an electrical resistance, but other types of heating elements are possible, for example a heat exchanger with a second circulation of a second fluid.

Le bocal peut comprendre un bouchon de fermeture en partie supérieure du bocal, le bouchon portant l'élément chauffant.The jar may include a closure cap in the upper part of the jar, the cap carrying the heating element.

Selon un autre mode de réalisation, qui peut se combiner au précédent, au moins une portion de l'élément chauffant est placée au niveau d'une portion de paroi du bocal distincte du bouchon.According to another embodiment, which can be combined with the previous one, at least one portion of the heating element is placed at a portion of the wall of the jar distinct from the cap.

Le circuit peut comprendre en outre :

  • un échangeur thermique traversé par le liquide ;
  • un capteur de pression du liquide ;
  • une unité de commande électronique connectée à l'élément chauffant et au capteur de pression.
The circuit may also include:
  • a heat exchanger crossed by the liquid;
  • a liquid pressure sensor;
  • an electronic control unit connected to the heating element and the pressure sensor.

De manière préférentielle, le capteur de pression de liquide se trouve plus proche de l'échangeur thermique que du bocal de dégazage.Preferably, the liquid pressure sensor is located closer to the heat exchanger than to the degassing tank.

L'unité de commande électronique peut être configurée pour actionner l'élément chauffant lorsque le capteur de pression lui transmet une mesure en écart par rapport à une valeur de consigne de pression, ou bien lorsque l'ébullition est détectée via un profil prédéfini d'ondes de pressions.The electronic control unit can be configured to activate the heating element when the pressure sensor transmits to it a measurement in deviation from a pressure setpoint value, or when boiling is detected via a predefined profile of pressure waves.

Des ondes de pression haute fréquence peuvent être par exemple indicatives d'un début d'ébullition du liquide, que l'on souhaite éviter, afin de limiter l'érosion du circuit d'échange thermique par cavitation.High frequency pressure waves can for example be indicative of the start of boiling of the liquid, which we wish to avoid, in order to limit erosion of the heat exchange circuit by cavitation.

Le circuit peut comprendre en outre un capteur ou un estimateur de température du liquide, connecté à l'unité de commande.The circuit may further include a liquid temperature sensor or estimator connected to the control unit.

De manière préférentielle, le capteur de pression de liquide se trouve plus proche de l'échangeur thermique que du bocal de dégazage. L'estimateur de température peut comprendre un capteur de température, placé par exemple sur le circuit de liquide.Preferably, the liquid pressure sensor is located closer to the heat exchanger than to the degassing tank. The temperature estimator may include a temperature sensor, placed for example on the liquid circuit.

L'unité de commande électronique peut être configurée pour déclencher un chauffage par l'élément chauffant si un couple de valeurs (pression température) obtenu à l'aide de l'estimateur de température et à l'aide du capteur de pression, se trouve d'un côté prédéfini d'une courbe seuil enregistrée, du côté des températures supérieures et des pressions inférieures par rapport à la courbe seuil. La courbe seuil peut correspondre à une courbe seuil d'ébullition du liquide.The electronic control unit can be configured to trigger heating by the heating element if a pair of values (pressure temperature) obtained using the temperature estimator and using the pressure sensor are found. on a predefined side of a recorded threshold curve, on the side of higher temperatures and lower pressures in relation to the threshold curve. The threshold curve can correspond to a boiling threshold curve of the liquid.

Par exemple, l'unité de commande électronique peut être configurée pour, lors de l'activation de l'élément chauffant, provoquer l'envoi d'une puissance de chauffe constante de niveau prédéfini, pendant un temps de chauffe prédéfini. L'élément chauffant peut ainsi transmettre une quantité d'énergie donnée avant une nouvelle évaluation par l'unité de commande, et avant au besoin le déclenchement de l'envoi d'une autre quantité d'énergie équivalente si le risque d'ébullition du liquide reste effectif.For example, the electronic control unit can be configured to, when activating the heating element, cause the sending of a constant heating power of a predefined level, for a predefined heating time. The heating element can thus transmit a given quantity of energy before a new evaluation by the control unit, and before if necessary triggering the sending of another equivalent quantity of energy if the risk of boiling of the liquid remains effective.

Selon un autre mode de réalisation qui peut se combiner au précédent, l'unité de commande électronique peut être configurée pour estimer la position d'un couple de valeurs (pression température) obtenu à l'aide de l'estimateur de température et à l'aide du capteur de pression, par rapport à une cartographie comprenant une suite de courbes seuils ou comprenant une surface seuil, et l'unité de commande peut être configurée pour, lors de l'activation de l'élément chauffant, provoquer l'envoi d'au moins deux puissances de chauffe différentes pour au moins deux positions différentes du point sur la cartographie.According to another embodiment which can be combined with the previous one, the electronic control unit can be configured to estimate the position of a pair of values (pressure temperature) obtained using the temperature estimator and the using the pressure sensor, in relation to a map comprising a series of threshold curves or comprising a threshold surface, and the control unit can be configured to, upon activation of the heating element, cause the sending at least two different heating powers for at least two different positions of the point on the map.

Les différentes puissances de chauffe peuvent être obtenues, en moyenne, par exemple en envoyant plusieurs quantités d'énergie successives, chaque quantité correspondant à l'alimentation de l'élément chauffant avec une même puissance électrique pendant une même durée, le nombre de quantités et l'intervalle de temps séparant les quantités, étant adaptés pour obtenir en moyenne la puissance de chauffe désirée.The different heating powers can be obtained, on average, for example by sending several successive quantities of energy, each quantity corresponding to the supply of the heating element with the same electrical power for the same duration, the number of quantities and the time interval separating the quantities, being adapted to obtain on average the desired heating power.

Selon un autre mode de réalisation, les différentes puissances de chauffe peuvent être obtenues en alimentant l'élément chauffant, pendant une durée prédéfinie, à une puissance électrique qui est adaptée en fonction de la puissance de chauffe déterminée à partir de la cartographie.According to another embodiment, the different heating powers can be obtained by powering the heating element, for a predefined duration, at an electrical power which is adapted as a function of the heating power determined from the mapping.

L'invention concerne également un véhicule automobile avec système de recirculation des gaz brûlés, le système de recirculation des gaz brûlés étant refroidi par un circuit d'échange thermique tel que décrit précédemment.The invention also relates to a motor vehicle with a burnt gas recirculation system, the burnt gas recirculation system being cooled by a heat exchange circuit as described above.

Quelques buts, caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante, donnée uniquement à titre d'exemple non limitatif, et faite en référence aux dessins annexés sur lesquels :

  • La figure 1 illustre un circuit d'échange thermique, plus particulièrement un circuit de refroidissement d'un échangeur EGR selon l'invention;
  • La figure 2 illustre un bocal de dégazage d'une autre variante de réalisation d'un circuit d'échange thermique selon l'invention.
Some aims, characteristics and advantages of the invention will appear on reading the following description, given solely by way of non-limiting example, and made with reference to the appended drawings in which:
  • There figure 1 illustrates a heat exchange circuit, more particularly a cooling circuit of an EGR exchanger according to the invention;
  • There figure 2 illustrates a degassing tank of another alternative embodiment of a heat exchange circuit according to the invention.

Tel qu'illustré sur la figure 1, un circuit d'échange thermique selon l'invention comprend un échangeur thermique 10 traversé par un liquide 8, qui est amené par des canalisations 2, à l'aide d'une pompe 14, de l'échangeur thermique 10 vers un bocal de dégazage 3 du circuit, puis de nouveau vers l'échangeur thermique 10. De manière préférentielle, dans le circuit d'échange thermique 1, le liquide 8 traverse au moins un deuxième échangeur thermique (non représenté sur les figures), afin de céder / respectivement récupérer au moins une partie des calories emmagasinées / respectivement cédées, au niveau de l'échangeur 10.As illustrated on the figure 1 , a heat exchange circuit according to the invention comprises a heat exchanger 10 crossed by a liquid 8, which is brought by pipes 2, using a pump 14, from the heat exchanger 10 to a jar of degassing 3 of the circuit, then again towards the heat exchanger 10. Preferably, in the heat exchange circuit 1, the liquid 8 passes through at least a second heat exchanger (not shown in the figures), in order to yield / respectively recover at least part of the calories stored / respectively released, at the level of the exchanger 10.

A titre d'exemple, ledit deuxième échangeur thermique peut être un aérotherme qui permet de réchauffer un air pulsé vers l'habitacle du véhicule.For example, said second heat exchanger can be a unit heater which makes it possible to heat air blown towards the passenger compartment of the vehicle.

Le bocal 3 comprend un bouchon de fermeture 4. Le bocal 3 est équipé d'un élément chauffant, désigné par la référence 5 sur la figure 1. Dans le mode de réalisation de la figure 1, l'élément chauffant est porté par le bouchon 4.The jar 3 includes a closure cap 4. The jar 3 is equipped with a heating element, designated by the reference 5 on the figure 1 . In the embodiment of the figure 1 , the heating element is carried by the cap 4.

Selon un autre mode de réalisation illustré en figure 2, l'élément chauffant, désigné par la référence 6 sur la figure 2, peut être porté par des parois du bocal, au dessus du niveau du liquide 8.According to another embodiment illustrated in figure 2 , the heating element, designated by the reference 6 on the figure 2 , can be carried by the walls of the jar, above the level of the liquid 8.

Sur les figures 1 et 2, le bocal de dégazage est dimensionné, et est placé dans le circuit thermique de manière à ce que le liquide 8 présent dans ce bocal soit surmonté d'un volume gazeux 9.On the figures 1 and 2 , the degassing jar is sized, and is placed in the thermal circuit so that the liquid 8 present in this jar is surmounted by a gaseous volume 9.

Pour revenir à la figure 1, l'élément chauffant, ici référencé 5, est connecté à une unité de commande électronique 7 qui déclenche et/ou qui régule l'alimentation électrique de l'élément chauffant en fonction de valeurs, respectivement P, T, délivrées par un capteur de pression 11 et par un capteur de température 12. La consigne Qcons envoyée par l'unité de commande électronique 7 à l'élément chauffant 5, permet de déclencher une élévation de température et de pression du volume gazeux 9, donc une mise en pression rapide du liquide 8, afin de retarder l'ébullition de celui-ci.To return to the figure 1 , the heating element, here referenced 5, is connected to an electronic control unit 7 which triggers and/or regulates the electrical power supply to the heating element as a function of values, respectively P, T, delivered by a temperature sensor. pressure 11 and by a temperature sensor 12. The Qcons setpoint sent by the electronic control unit 7 to the heating element 5, makes it possible to trigger an increase in temperature and pressure of the gas volume 9, therefore rapid pressurization liquid 8, in order to delay its boiling.

L'unité de commande électronique 7 peut à cet effet comparer les valeurs P, T à des valeurs enregistrées dans une cartographie 13, afin de déterminer si le liquide 8 est dans des conditions proches de l'ébullition, ou non.The electronic control unit 7 can for this purpose compare the values P, T to values recorded in a map 13, in order to determine whether the liquid 8 is in conditions close to boiling, or not.

Selon un mode de réalisation, le circuit d'échange thermique 1 peut comprendre un circuit de refroidissement d'un moteur (moteur non représenté) qui est connectée à l'échangeur thermique 10. Par conséquent, le liquide 8 circulant dans le bocal de dégazage peut être du liquide circulant au travers du moteur du véhicule pour échanger des calories.According to one embodiment, the heat exchange circuit 1 may comprise a cooling circuit of a motor (motor not shown) which is connected to the heat exchanger 10. Consequently, the liquid 8 circulating in the degassing tank may be liquid circulating through the vehicle's engine to exchange calories.

Le circuit d'échange thermique équipé d'un bocal de dégazage selon l'invention, permet de tolérer une utilisation à plus haute température du liquide caloporteur, donc de limiter le débit de celui-ci, ce qui au final permet de limiter la consommation en carburant du véhicule équipé du circuit d'échange thermique .The heat exchange circuit equipped with a degassing tank according to the invention makes it possible to tolerate use at a higher temperature of the heat transfer liquid, therefore to limit the flow rate thereof, which ultimately makes it possible to limit consumption. in fuel of the vehicle equipped with the heat exchange circuit.

Claims (10)

  1. Heat exchange circuit (1), comprising:
    - a pipeline circuit (2) in which pipelines a liquid (8) circulates which is intended to transport calories for thermal regulation;
    - a degassing jar (3) connected to the pipeline circuit (2), configured to reserve an expansion volume in which said liquid is located topped by a volume of gas (9),
    characterized in that the degassing jar (3) is equipped with a heating element (5,6), the heating element being placed so as to remain out of the liquid (8) in the planned conditions of use, and being configured to make it possible to directly heat the gas (9) topping the liquid (8).
  2. Heat exchange circuit according to Claim 1, the jar (3) comprising a sealing stopper (4) in the top part of the jar, the stopper (4) bearing the heating element (5).
  3. Heat exchange circuit according to Claim 1 or 2, wherein the jar (3) comprises a sealing stopper (4) in the top part of the jar, and wherein at least a portion of the heating element (6) is placed level with a portion of wall of the jar distinct from the stopper (4).
  4. Heat exchange circuit according to one of Claims 1 to 3, also comprising:
    - a heat exchanger (10) passed through by the liquid;
    - a liquid pressure sensor (11);
    - an electronic control unit (7) connected to the heating element (5) and to the pressure sensor (11).
  5. Heat exchange circuit according to Claim 4, wherein the electronic control unit (7) is configured to actuate the heating element (5, 6) when the pressure sensor (11) transmits to it a measurement of a predefined profile of pressure waves.
  6. Heat exchange circuit according to one of Claims 4 or 5, also comprising a sensor (12) or an estimator of the temperature of the liquid, connected to the electronic control unit (7).
  7. Heat exchange circuit according to Claim 6, wherein the electronic control unit (7) is configured to trigger a heating by the heating element (5, 6) if a pair of pressure and temperature values (P, T) obtained using the temperature estimator (12) and using the pressure sensor (11), is located on a predefined side of a threshold curve recorded in a mapping (13), on the side of the higher temperatures and of the lower pressures relative to the threshold curve.
  8. Heat exchange circuit according to one of Claims 4 to 7, wherein the electronic control unit (7) is configured to, upon the activation of the heating element (5, 6), provoke the sending of a constant heating power of predefined level, for a predefined heating time.
  9. Heat exchange circuit according to Claim 7, wherein the electronic control unit (7) is configured to estimate the position of a pair of pressure and temperature values (P, T) obtained using the temperature estimator (12) and using the pressure sensor (11), relative to a mapping (13) comprising a series of threshold curves or comprising a threshold surface, and the control unit (7) is configured to, upon the activation of the heating element (5, 6), provoke the sending of at least two different heating powers for at least two different positions of the point (P, T) on the mapping.
  10. Motor vehicle with waste gas recirculation system, the waste gas recirculation system comprising a heat exchange circuit (1) according to any one of the preceding claims for cooling the waste gas recirculation system.
EP19701366.7A 2018-01-29 2019-01-29 Degassing vessel for motor vehicle cooling circuit Active EP3746647B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1850650A FR3077332B1 (en) 2018-01-29 2018-01-29 DEGASSING JAR FOR AUTOMOTIVE COOLING CIRCUIT
PCT/EP2019/052039 WO2019145550A1 (en) 2018-01-29 2019-01-29 Degassing vessel for motor vehicle cooling circuit

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EP3746647A1 EP3746647A1 (en) 2020-12-09
EP3746647B1 true EP3746647B1 (en) 2024-01-24

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EP (1) EP3746647B1 (en)
CN (1) CN111727308A (en)
FR (1) FR3077332B1 (en)
WO (1) WO2019145550A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2693763B1 (en) * 1992-07-17 1994-09-02 Peugeot Improvements to the cooling circuits of internal combustion engines.
SE530868C2 (en) * 2007-02-09 2008-09-30 Volvo Lastvagnar Ab Cooling
FR2923261A1 (en) * 2007-11-06 2009-05-08 Renault Sas Expansion tank for cooling circuit of vehicle's internal combustion engine, has container including chamber provided with parts that contain liquid and air, respectively, and other chamber that receives pressurization unit pressurizing air
FR2949509B1 (en) * 2009-09-03 2011-11-25 Peugeot Citroen Automobiles Sa INTERNAL COMBUSTION ENGINE HAVING A COOLING CIRCUIT WITH A BYPASS
DE102011108041B4 (en) * 2011-07-19 2022-01-20 Daimler Ag Heatable device for controlling the system pressure in a coolant circuit for an internal combustion engine
FR2979693B1 (en) * 2011-09-06 2013-08-23 Valeo Systemes Thermiques ELECTRICAL HEATING DEVICE FOR A MOTOR VEHICLE, AND HEATING AND / OR AIR CONDITIONING APPARATUS THEREFOR
CN202789250U (en) * 2012-08-27 2013-03-13 亚普汽车部件股份有限公司 Fuel tank capable of controlling internal temperature

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FR3077332A1 (en) 2019-08-02
EP3746647A1 (en) 2020-12-09
WO2019145550A1 (en) 2019-08-01
CN111727308A (en) 2020-09-29
FR3077332B1 (en) 2020-05-01

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