EP2112347B1 - Engine cooling circuit - Google Patents

Engine cooling circuit Download PDF

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Publication number
EP2112347B1
EP2112347B1 EP09155629.0A EP09155629A EP2112347B1 EP 2112347 B1 EP2112347 B1 EP 2112347B1 EP 09155629 A EP09155629 A EP 09155629A EP 2112347 B1 EP2112347 B1 EP 2112347B1
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EP
European Patent Office
Prior art keywords
coolant
valve
outlet box
opening
cooling
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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.)
Active
Application number
EP09155629.0A
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German (de)
French (fr)
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EP2112347A1 (en
Inventor
Pierre Dumoulin
Armel Le Lievre
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.)
PSA Automobiles SA
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PSA Automobiles SA
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Publication of EP2112347A1 publication Critical patent/EP2112347A1/en
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Publication of EP2112347B1 publication Critical patent/EP2112347B1/en
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Classifications

    • 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
    • F01P11/028—Deaeration devices
    • 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
    • F01P11/0285—Venting devices
    • 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
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
    • 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
    • F01P2060/02—Intercooler
    • 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
    • F01P2060/04—Lubricant cooler
    • F01P2060/045—Lubricant cooler for transmissions

Definitions

  • the invention relates to the cooling circuits of motor vehicle engines, and in particular the structure of coolant outlet housings receiving the heated coolant from the engine and provided with means for measuring a temperature of the liquid located in the engine.
  • the box is the structure of coolant outlet housings receiving the heated coolant from the engine and provided with means for measuring a temperature of the liquid located in the engine.
  • the document FR 2 903 143 discloses a motor vehicle engine cooling circuit.
  • This circuit comprises a water outlet housing provided with a temperature sensor and a thermostat.
  • the housing comprises an outlet main pipe for transporting water to a radiator whose function is to cool said water, the cooled water being then conveyed by means of a pipe to the inlet of a water pump located upstream of the engine.
  • the pump helps to circulate the cooled water in the engine and the heated water is then recovered in the housing.
  • the housing comprises a first secondary water outlet pipe for supplying a heater with water and whose function is to create heating in the passenger compartment of the motor vehicle. The water recovered at the outlet of the heater is routed to the pump inlet for re-injection into the engine cooling circuit.
  • the circulation of water in this first secondary pipe is controlled by means of a first solenoid valve placed between the housing and the heater.
  • the housing has a second secondary outlet pipe which connects directly to the pipe connecting the radiator to the inlet of the pump, and constituting a bypass portion bypassing the radiator and the heater.
  • Water circulation in the second secondary pipe is controlled by means of a second solenoid valve, more precisely a proportional solenoid valve placed between the housing and the inlet of the pump.
  • This bypass portion directly sends the heated water from the engine to the upstream portion of the cooling circuit positioned before said engine.
  • a 4 mm diameter branch tubing connects the housing part where the temperature sensor is installed to the pump inlet.
  • the tubing has no means of closure and remains permanently open and thus ensures a low flow of water near the probe when the connection to the radiator has been cut.
  • a degassing housing receives coolant through a pipe from the radiator, and another pipe from the outlet housing.
  • the degassing box eliminates bubbles in the coolant.
  • the pipe coming from the outlet housing is in particular a motor protection against breaks in the cylinder head gasket. The water recovered at the outlet of said housing is fed back into the pipe joining the radiator at the inlet of the pump.
  • the invention aims to solve one or more of these disadvantages.
  • the invention thus relates to a cooling circuit of an engine according to the subject of claim 1.
  • no duct directly connects the outlet box to the degassing box.
  • the circuit includes a diesel engine delivering coolant in the outlet housing.
  • the circuit further comprises an automatic transmission cooling exchanger equipped with a temperature probe and a pump receiving cooling liquid from the radiator via a conduit in which a circuit withdraws coolant in the conduit, passes through the cooling exchanger and delivers the coolant into the conduit, and wherein the open command controls the opening of the first valve when the temperature measured by the probe temperature exceeds a second threshold.
  • the circuit does not have a bypass between a point upstream of the automatic transmission cooling exchanger and a point of the cooling circuit downstream of the output box.
  • the circuit includes a coolant temperature probe in the output housing, the opening control controlling the opening of the first valve when the temperature measured by the temperature sensor exceeds the first threshold.
  • the circuit further comprises a heater adapted to receive cooling liquid from the outlet housing; a second valve closing the flow of coolant between the outlet box and the heater; a pump suitable for discharging coolant into the aerator when the internal combustion engine is stopped ; and the opening command controlling the opening of the second valve when the internal combustion engine is stopped.
  • the circuit further comprises a pump driving the cooling liquid into the engine, an output of the heater being connected to this pump; a bypass conduit directly connecting the output box to said pump; and, a third valve closing the coolant flow in the bypass duct, the control selectively controlling the opening of the third valve.
  • the circuit comprises a secondary radiator; an intake air cooling exchanger, adapted to receive coolant from the engine and to discharge this coolant in the output housing; a pump generating a flow between the intake air exchanger and the secondary radiator in a secondary circuit; the outlet housing being provided with a fourth valve closing the flow of coolant from the intake air cooling exchanger; the command intermittently controlling the stopping of the pump and the opening of the fourth valve.
  • the output housing further comprises a sliding actuator whose position defines the opening or closing of the first to fourth valves.
  • the invention provides a cooling circuit provided with a coolant outlet housing separated from a cooling radiator by a shut-off valve opening when the coolant temperature in the housing exceeds a threshold.
  • a degassing housing receives coolant from the radiator.
  • a valve opening command controls intermittent valve openings even when the temperature of the coolant in the outlet housing is below said threshold.
  • the invention allows intermittently degassing the coolant in the water box without complicating the cooling circuit, without impairing the warming of the engine.
  • the invention is particularly useful when the engine used is of the diesel type, this type of engine having a slower rise in temperature, and therefore a lower frequency of opening of the valve putting the output box in communication with the radiator.
  • the figure 1 illustrates a cooling circuit 1 of an internal combustion engine 2.
  • the circuit 1 comprises a casing 3 of coolant outlet.
  • a temperature sensor 4 and a thermostatic valve 5 are arranged in the outlet housing 3.
  • the thermostatic valve 5 selectively releases the flow of liquid between the outlet housing 3 and a radiator 7 above a threshold temperature.
  • the function of the radiator 7 is to cool the coolant, in this case water, flowing in the cooling circuit 1.
  • the thermostatic valve 5 closes one end of a duct 6 joining the outlet housing 3 and the radiator 7.
  • a duct 9 brings the cooling liquid of the radiator 7 to a pump 8.
  • the pump 8 delivers the cooling liquid into the pipes of the engine 2. After having passed through these pipes, the coolant is received in the outlet housing 3. Part of the coolant discharged into these engine pipes passes through a water / oil radiator 20.
  • a conduit 19 discharges the cooling liquid from the water radiator / oil 20 in the outlet housing 3.
  • the cooling circuit 1 further comprises a first secondary pipe 10 connecting the outlet housing 3 to the pump 8.
  • the circuit comprises a peripheral connected in the secondary pipe 10, in this case a heater 11.
  • the cooling circuit 1 comprises a second secondary pipe 13 connecting the outlet housing 3 to the pipe 9 via a valve 14.
  • This secondary pipe 13 makes it possible to directly send heated water from the engine 2 to the pump 8, so that that coolant reaches the pump 8 with a lower pressure drop than that generated by the heater 11 in the secondary pipe 10.
  • the solenoid valve 14 is in particular open during the starting phases of the engine 2 to accelerate its operation. warming speed.
  • a degassing housing 18 is intended to remove bubbles present in the coolant.
  • the housing 18 receives cooling liquid from the radiator 7 via a pipe 17.
  • the degassed cooling liquid is discharged into the pipe 9.
  • an opening command of the valve 5 causes intermittent openings of this valve even when the temperature of the coolant in the outlet housing 3 is below the opening threshold.
  • the intermittent openings of the valve 5 make it possible to degas the coolant from the outlet housing 3 without unduly delaying the heating of the engine 2 and without increasing the complexity of the cooling circuit.
  • the illustrated cooling circuit has no conduit directly connecting the outlet housing 3 to the degassing housing 18.
  • the control can control the opening of the valve 5 according to the ambient temperature, the water temperature and the information concerning the engine speed or load. In the starting phase of the engine, if the water temperature is equal to the ambient temperature, the control can open the valve 5 for several seconds. The control can make intermittent openings of the valve 5 with a duty cycle advantageously less than 5%.
  • an automatic gearbox 24 serves as transmission to the engine 2.
  • the gearbox 24 comprises a cooling exchanger 25, typically of water / oil type, as well as a temperature sensor 26.
  • a conduit 22 withdraws coolant on the pipe 9 downstream of the radiator 7 and delivers it to the inlet of the exchanger 25.
  • a pipe 23 draws coolant at the outlet of the exchanger 25 and delivers it to the pipe 9 downstream of the sewing of the pipe 22.
  • a cooling water circuit thus feeds the exchanger 25.
  • the control opens the valve 5 when the temperature measured by the temperature sensor 26 exceeds a threshold, even when the temperature in the outlet housing 3 is less than the opening threshold of the valve 5.
  • the automatic gearbox 24 can be cooled even during a heating phase of the engine 2, without for ant require a complex cooling circuit.
  • the cooling circuit 1 illustrated does not show a shunt between a point upstream of the cooling exchanger 25 and a point of the cooling circuit downstream of the outlet housing 3.
  • the opening of the valve 5 may also be controlled according to additional information from the gearbox.
  • the opening of the valve 5 will be electronically controlled.
  • the temperature probe 4 will allow the control to determine when the temperature of the coolant in the outlet housing exceeds the threshold beyond which the engine 2 is to be cooled.
  • the valve 5 will then be open beyond this threshold.
  • the thermostatic valve may of course include a security causing its automatic opening when the liquid of cooling reaches a temperature too high.
  • the valve may thus comprise a wax member whose expansion causes it to open.
  • the outlet housing 3 further comprises a valve closing the flow of the coolant to the heater 11.
  • the control can open this valve and close the valve 5, to allow the supply of the heater with coolant that has not been cooled in the radiator 7.
  • a lending function conditioning of the passenger compartment may in particular be carried out.
  • the flow in the heater 11 may be generated by means of a dedicated pump.
  • the cooling circuit 1 also comprises an intake air cooling circuit, used, for example, for cooling compressed intake air by a turbine.
  • a pump 27 delivers cooling liquid into a conduit 30 leading to an inlet of an air / water intake air heat exchanger 31.
  • An outlet of the exchanger 31 delivers the cooling liquid to a secondary radiator 21 via a The radiator 21 is typically disposed in the front of the vehicle, close to the radiator 7.
  • An inlet of the exchanger 31 receives coolant from the engine 2. In this case, this inlet receives coolant from the pipe 19.
  • An outlet of the exchanger 31 is connected to the outlet housing 3 via a conduit 29.
  • a valve closes the communication between the exchanger 31 and the housing of 3.
  • this valve will be closed and the pump 27 will be engaged so that the radiator 21 cools the coolant through the exchanger 31.
  • this valve will be open and pump 27 will be stopped, so that hot coolant will be taken from the pipe 19, pass through the heat exchanger 31 to heat the intake air, and will be discharged into the outlet housing 3.
  • the control will realize the opening of this valve as a function of information on the need for hot air at the engine inlet, depending on the outside temperature, as a function of the temperature measured by the probe 4 and according to the engine speed or load.
  • the figure 2 schematically represents a coolant outlet box 3 and its valves for supplying different parts of the cooling circuit 1.
  • the valve 34 closes the pipe 10 towards the heater 11.
  • the valve 33 closes the pipe 29 coming from the exchanger 31.
  • the valve 35 closes the pipe 13.
  • the control 32 controls the opening and closing of these valves.
  • the figure 3 represents the circuit supplied during an intermittent opening of the valve 5. Coolant is discharged through the outlet housing 3 into the radiator 7. Coolant is discharged by the radiator 7 into the degassing housing 18, and in the exchanger 25. The coolant exiting the degassing housing 18 and the exchanger 25 is discharged to the outlet housing 3.
  • the figure 4 represents the circuit 1 supplied during an opening of the valve 34 when the engine 2 is stopped.
  • Valve 34 is open, while valves 5,33 and 35 are closed.
  • the coolant is discharged through the outlet housing 3 to the heater 11, passes through the motor and is forced into the outlet housing 3.
  • the figure 5 represents the circuit 1 supplied during a heating of the intake air.
  • the valve 35 is open so that the flow rate discharged by the pump 8 into the engine 2 is increased. Coolant from the engine 2 passes through the exchanger 31.
  • the valve 33 is open, so that the coolant discharged by the exchanger 31 is received by the outlet housing 3.
  • the outlet housing 3 may comprise a sliding actuator whose position defines the opening or closing of the valves 5, 33, 34 and 35.
  • the valves 5, 33, 34 and 35 may be all or nothing or proportional valves.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Air-Conditioning For Vehicles (AREA)

Description

L'invention concerne les circuits de refroidissement de moteurs de véhicules automobiles, et en particulier la structure de boîtiers de sortie de liquide de refroidissement recevant le liquide de refroidissement réchauffé en provenance du moteur et doté de moyens permettant de mesurer une température du liquide situé dans le boîtier.The invention relates to the cooling circuits of motor vehicle engines, and in particular the structure of coolant outlet housings receiving the heated coolant from the engine and provided with means for measuring a temperature of the liquid located in the engine. The box.

Il est connu d'utiliser des vannes permettant de couper complètement l'écoulement d'eau de refroidissement vers le radiateur durant les phases de démarrage. Ainsi, les inerties thermiques du moteur sont réduites et il atteint le plus rapidement possible sa température optimale de fonctionnement. Lorsque le moteur atteint une température suffisante et dépasse un seuil, l'écoulement de l'eau de refroidissement vers le radiateur est libéré.It is known to use valves to completely cut the flow of cooling water to the radiator during the startup phases. Thus, the thermal inertia of the engine is reduced and it reaches as quickly as possible its optimum operating temperature. When the engine reaches a sufficient temperature and exceeds a threshold, the flow of cooling water to the radiator is released.

Le document FR 2 903 143 décrit un circuit de refroidissement de moteur de véhicule automobile. Ce circuit comprend un boîtier de sortie d'eau muni d'une sonde de température et d'un thermostat. Le boîtier comprend une canalisation principale de sortie pour transporter l'eau vers un radiateur dont la fonction est de refroidir ladite eau, l'eau ainsi refroidie étant ensuite acheminée au moyen d'une canalisation vers l'entrée d'une pompe à eau située en amont du moteur. La pompe contribue à faire circuler l'eau refroidie dans le moteur et l'eau ainsi réchauffée est ensuite récupérée dans le boîtier. Le boîtier comporte une première canalisation secondaire de sortie d'eau destinée à alimenter un aérotherme en eau et dont la fonction est de créer du chauffage dans l'habitacle du véhicule automobile. L'eau récupérée à la sortie de l'aérotherme est acheminée vers l'entrée de la pompe pour être réinjectée dans le circuit de refroidissement du moteur. La circulation d'eau dans cette première canalisation secondaire est pilotée au moyen d'une première électrovanne placée entre le boîtier et l'aérotherme. Le boîtier possède une deuxième canalisation secondaire de sortie qui vient se connecter directement sur la canalisation reliant le radiateur à l'entrée de la pompe, et constituant une portion de dérivation court-circuitant le radiateur et l'aérotherme. La circulation d'eau dans la deuxième canalisation secondaire est pilotée au moyen d'une deuxième électrovanne, plus précisément une électrovanne proportionnelle placée entre le boîtier et l'entrée de la pompe. Cette portion de dérivation permet d'envoyer directement de l'eau réchauffée en provenance du moteur vers la partie amont du circuit de refroidissement positionnée avant ledit moteur. Une tubulure de dérivation d'un diamètre de 4 mm relie la partie du boîtier où est implantée la sonde de température à l'entrée de la pompe. La tubulure ne dispose d'aucun moyen de fermeture et reste en permanence ouverte et permet donc d'assurer une faible circulation d'eau à proximité de la sonde lorsque la liaison vers le radiateur a été coupée. Un boîtier de dégazage reçoit du liquide de refroidissement par une canalisation provenant du radiateur, et par une autre canalisation provenant du boîtier de sortie. Le boîtier de dégazage élimine les bulles présentes dans le liquide de refroidissement. La canalisation provenant du boîtier de sortie constitue notamment une protection du moteur contre les ruptures de joint de culasse. L'eau récupérée à la sortie dudit boîtier est réinjectée dans la canalisation joignant le radiateur à l'entrée de la pompe.The document FR 2 903 143 discloses a motor vehicle engine cooling circuit. This circuit comprises a water outlet housing provided with a temperature sensor and a thermostat. The housing comprises an outlet main pipe for transporting water to a radiator whose function is to cool said water, the cooled water being then conveyed by means of a pipe to the inlet of a water pump located upstream of the engine. The pump helps to circulate the cooled water in the engine and the heated water is then recovered in the housing. The housing comprises a first secondary water outlet pipe for supplying a heater with water and whose function is to create heating in the passenger compartment of the motor vehicle. The water recovered at the outlet of the heater is routed to the pump inlet for re-injection into the engine cooling circuit. The circulation of water in this first secondary pipe is controlled by means of a first solenoid valve placed between the housing and the heater. The housing has a second secondary outlet pipe which connects directly to the pipe connecting the radiator to the inlet of the pump, and constituting a bypass portion bypassing the radiator and the heater. Water circulation in the second secondary pipe is controlled by means of a second solenoid valve, more precisely a proportional solenoid valve placed between the housing and the inlet of the pump. This bypass portion directly sends the heated water from the engine to the upstream portion of the cooling circuit positioned before said engine. A 4 mm diameter branch tubing connects the housing part where the temperature sensor is installed to the pump inlet. The tubing has no means of closure and remains permanently open and thus ensures a low flow of water near the probe when the connection to the radiator has been cut. A degassing housing receives coolant through a pipe from the radiator, and another pipe from the outlet housing. The degassing box eliminates bubbles in the coolant. The pipe coming from the outlet housing is in particular a motor protection against breaks in the cylinder head gasket. The water recovered at the outlet of said housing is fed back into the pipe joining the radiator at the inlet of the pump.

Un tel circuit de refroidissement présente des inconvénients. D'une part, le dégazage du liquide de refroidissement nécessite plusieurs conduits pour assurer une protection en cas de rupture de joint de culasse, ce qui accroît encore le coût et la complexité du circuit de refroidissement. D'autre part, ce document ne propose pas de solution au refroidissement d'une boîte de vitesses automatique, celle-ci pouvant atteindre une température critique plus rapidement que le moteur notamment en cycle urbain. Des solutions envisagées font appel à un conduit de dérivation additionnel repiqué en amont de l'aérotherme, ce qui accroît le coût et la complexité du circuit de refroidissement. Par ailleurs, l'alimentation de l'aérotherme durant un arrêt du moteur à combustion interne ne donne pas satisfaction. En outre, les solutions connues permettant d'utiliser le circuit de refroidissement pour basculer un radiateur de refroidissement d'air d'admission entre un mode de refroidissement et un mode de chauffage ne donnent pas entièrement satisfaction.Such a cooling circuit has drawbacks. On the one hand, the degassing of the coolant requires several ducts to provide protection in case of rupture of the cylinder head gasket, which further increases the cost and complexity of the cooling circuit. On the other hand, this document does not propose a solution to the cooling of an automatic gearbox, which can reach a critical temperature faster than the engine, particularly in the urban cycle. Solutions envisaged use an additional bypass duct placed upstream of the heater, which increases the cost and complexity of the cooling circuit. In addition, the power supply of the heater during a shutdown of the internal combustion engine is not satisfactory. In addition, known solutions for using the cooling circuit to switch an intake air cooling radiator between a cooling mode and a heating mode are not entirely satisfactory.

L'invention vise à résoudre un ou plusieurs de ces inconvénients. L'invention porte ainsi sur un circuit de refroidissement d'un moteur conformément à l'objet de la revendication 1.The invention aims to solve one or more of these disadvantages. The invention thus relates to a cooling circuit of an engine according to the subject of claim 1.

Selon une variante, aucun conduit ne relie directement le boîtier de sortie au boîtier de dégazage.According to a variant, no duct directly connects the outlet box to the degassing box.

Selon encore une variante, le circuit inclut un moteur diesel refoulant du liquide de refroidissement dans le boîtier de sortie.According to another variant, the circuit includes a diesel engine delivering coolant in the outlet housing.

Selon une autre variante, le circuit comprend en outre un échangeur de refroidissement d'une boîte de vitesses automatique muni d'une sonde de température et une pompe recevant du liquide de refroidissement en provenance du radiateur par l'intermédiaire d'un conduit dans lequel un circuit prélève du liquide de refroidissement dans le conduit, traverse l'échangeur de refroidissement et refoule le liquide de refroidissement dans le conduit, et dans lequel la commande d'ouverture commande l'ouverture de la première vanne lorsque la température mesurée par la sonde de température dépasse un deuxième seuil.According to another variant, the circuit further comprises an automatic transmission cooling exchanger equipped with a temperature probe and a pump receiving cooling liquid from the radiator via a conduit in which a circuit withdraws coolant in the conduit, passes through the cooling exchanger and delivers the coolant into the conduit, and wherein the open command controls the opening of the first valve when the temperature measured by the probe temperature exceeds a second threshold.

Selon encore une autre variante, le circuit ne présente pas de dérivation entre un point en amont de l'échangeur de refroidissement de boîte de vitesses automatique et un point du circuit de refroidissement en aval du boîtier de sortie.According to yet another variant, the circuit does not have a bypass between a point upstream of the automatic transmission cooling exchanger and a point of the cooling circuit downstream of the output box.

Selon une variante, le circuit comporte une sonde de la température du liquide de refroidissement dans le boîtier de sortie, la commande d'ouverture commandant l'ouverture de la première vanne lorsque la température mesurée par cette sonde de température dépasse le premier seuil.Alternatively, the circuit includes a coolant temperature probe in the output housing, the opening control controlling the opening of the first valve when the temperature measured by the temperature sensor exceeds the first threshold.

Selon encore une variante, le circuit comprend en outre un aérotherme apte à recevoir du liquide de refroidissement en provenance du boîtier de sortie ; une deuxième vanne obturant l'écoulement du liquide de refroidissement entre le boîtier de sortie et l'aérotherme ; une pompe apte à refouler du liquide de refroidissement dans l'aérateur lorsque le moteur à combustion interne est arrêté ; et la commande d'ouverture commandant l'ouverture de la deuxième vanne lorsque le moteur à combustion interne est arrêté.According to another variant, the circuit further comprises a heater adapted to receive cooling liquid from the outlet housing; a second valve closing the flow of coolant between the outlet box and the heater; a pump suitable for discharging coolant into the aerator when the internal combustion engine is stopped ; and the opening command controlling the opening of the second valve when the internal combustion engine is stopped.

Selon encore une variante, le circuit comprend en outre une pompe refoulant le liquide de refroidissement dans le moteur, une sortie de l'aérotherme étant raccordée à cette pompe ; un conduit de dérivation raccordant directement le boîtier de sortie à ladite pompe ; et, une troisième vanne obturant l'écoulement du liquide de refroidissement dans le conduit de dérivation, la commande commandant sélectivement l'ouverture de la troisième vanne.According to another variant, the circuit further comprises a pump driving the cooling liquid into the engine, an output of the heater being connected to this pump; a bypass conduit directly connecting the output box to said pump; and, a third valve closing the coolant flow in the bypass duct, the control selectively controlling the opening of the third valve.

Selon une autre variante, le circuit comprend un radiateur secondaire ; un échangeur de refroidissement d'air d'admission, apte à recevoir du liquide de refroidissement en provenance du moteur et à refouler ce liquide de refroidissement dans le boîtier de sortie ; une pompe générant un écoulement entre l'échangeur d'air d'admission et le radiateur secondaire dans un circuit secondaire ; le boîtier de sortie étant muni d'une quatrième vanne obturant l'écoulement du liquide de refroidissement en provenance de l'échangeur de refroidissement d'air d'admission ; la commande commandant par intermittence l'arrêt de la pompe et l'ouverture de la quatrième vanne.According to another variant, the circuit comprises a secondary radiator; an intake air cooling exchanger, adapted to receive coolant from the engine and to discharge this coolant in the output housing; a pump generating a flow between the intake air exchanger and the secondary radiator in a secondary circuit; the outlet housing being provided with a fourth valve closing the flow of coolant from the intake air cooling exchanger; the command intermittently controlling the stopping of the pump and the opening of the fourth valve.

Selon encore une autre variante, le boîtier de sortie comprend en outre un actionneur coulissant dont la position définit l'ouverture ou la fermeture des première à quatrième vannes.According to another variant, the output housing further comprises a sliding actuator whose position defines the opening or closing of the first to fourth valves.

D'autres caractéristiques et avantages de l'invention ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels :

  • la figure 1 est une représentation schématique d'un circuit de refroidissement de véhicule automobile ;
  • la figure 2 est une représentation schématique du circuit d'eau alimenté par le boîtier de sortie de la figure 1 ;
  • la figure 3 représente le circuit d'eau de la figure 2 lors d'une commande de dégazage et de refroidissement d'une boîte de vitesse ;
  • la figure 4 représente le circuit d'eau de la figure 2 lors d'une commande d'alimentation de l'aérotherme à l'arrêt du moteur ;
  • la figure 5 représente le circuit d'eau de la figure 2 lors d'une commande de réchauffage d'air d'admission.
Other characteristics and advantages of the invention will emerge clearly from the description which is given hereinafter, by way of indication and in no way limitative, with reference to the appended drawings, in which:
  • the figure 1 is a schematic representation of a motor vehicle cooling circuit;
  • the figure 2 is a schematic representation of the water circuit fed by the output box of the figure 1 ;
  • the figure 3 represents the water circuit of the figure 2 during a control of degassing and cooling of a gearbox;
  • the figure 4 represents the water circuit of the figure 2 during a power supply control of the heater at the engine stop;
  • the figure 5 represents the water circuit of the figure 2 during an intake air heating control.

L'invention propose un circuit de refroidissement muni d'un boîtier de sortie de liquide de refroidissement séparé d'un radiateur de refroidissement par une vanne d'obturation s'ouvrant lorsque la température du liquide de refroidissement dans le boîtier dépasse un seuil. Un boîtier de dégazage reçoit du liquide de refroidissement en provenance du radiateur. Une commande d'ouverture de la vanne commande des ouvertures intermittentes de la vanne même lorsque la température du liquide de refroidissement dans le boîtier de sortie est inférieure audit seuil.The invention provides a cooling circuit provided with a coolant outlet housing separated from a cooling radiator by a shut-off valve opening when the coolant temperature in the housing exceeds a threshold. A degassing housing receives coolant from the radiator. A valve opening command controls intermittent valve openings even when the temperature of the coolant in the outlet housing is below said threshold.

L'invention permet de dégazer de façon intermittente le liquide de refroidissement dans la boîte à eau sans complexifier le circuit de refroidissement, sans pour autant nuire au réchauffement du moteur. L'invention s'avère particulièrement utile lorsque le moteur utilisé est du type diesel, ce type de moteur ayant une montée en température plus lente, et donc une fréquence plus réduite d'ouverture de la vanne mettant en communication la boîte de sortie et le radiateur.The invention allows intermittently degassing the coolant in the water box without complicating the cooling circuit, without impairing the warming of the engine. The invention is particularly useful when the engine used is of the diesel type, this type of engine having a slower rise in temperature, and therefore a lower frequency of opening of the valve putting the output box in communication with the radiator.

La figure 1 illustre un circuit de refroidissement 1 d'un moteur à combustion interne 2. Le circuit 1 comprend un boîtier 3 de sortie de liquide de refroidissement. Une sonde 4 de température et une vanne thermostatique 5 sont disposées dans le boîtier de sortie 3. La vanne thermostatique 5 libère sélectivement l'écoulement du liquide entre le boîtier de sortie 3 et un radiateur 7 au-dessus d'une température seuil. La fonction du radiateur 7 est de refroidir le liquide de refroidissement, en l'occurrence de l'eau, s'écoulant dans le circuit de refroidissement 1. La vanne thermostatique 5 obture une extrémité d'un conduit 6 joignant le boîtier de sortie 3 et le radiateur 7. Un conduit 9 ramène le liquide de refroidissement du radiateur 7 jusqu'à une pompe 8. La pompe 8 refoule le liquide de refroidissement dans des canalisations du moteur 2. Après avoir traversé ces canalisations, le liquide de refroidissement est reçu dans le boîtier de sortie 3. Une partie du liquide de refroidissement refoulé dans ces canalisations du moteur traverse un radiateur eau/huile 20. Un conduit 19 déverse le liquide de refroidissement provenant du radiateur eau/huile 20 dans le boîtier de sortie 3.The figure 1 illustrates a cooling circuit 1 of an internal combustion engine 2. The circuit 1 comprises a casing 3 of coolant outlet. A temperature sensor 4 and a thermostatic valve 5 are arranged in the outlet housing 3. The thermostatic valve 5 selectively releases the flow of liquid between the outlet housing 3 and a radiator 7 above a threshold temperature. The function of the radiator 7 is to cool the coolant, in this case water, flowing in the cooling circuit 1. The thermostatic valve 5 closes one end of a duct 6 joining the outlet housing 3 and the radiator 7. A duct 9 brings the cooling liquid of the radiator 7 to a pump 8. The pump 8 delivers the cooling liquid into the pipes of the engine 2. After having passed through these pipes, the coolant is received in the outlet housing 3. Part of the coolant discharged into these engine pipes passes through a water / oil radiator 20. A conduit 19 discharges the cooling liquid from the water radiator / oil 20 in the outlet housing 3.

Le circuit de refroidissement 1 comporte de plus une première canalisation secondaire 10 connectant le boîtier de sortie 3 à la pompe 8. Le circuit comprend un périphérique connecté dans la canalisation secondaire 10, en l'occurrence un aérotherme 11. Le circuit de refroidissement 1 comporte une seconde canalisation secondaire 13 raccordant le boîtier de sortie 3 au conduit 9 par l'intermédiaire d'une vanne 14. Cette canalisation secondaire 13 permet d'envoyer directement de l'eau réchauffée en provenance du moteur 2 vers la pompe 8, de sorte que du liquide de refroidissement atteigne la pompe 8 avec une perte de charge inférieure à celle générée par l'aérotherme 11 dans la canalisation secondaire 10. L'électrovanne 14 est en particulier ouverte durant les phases de démarrage du moteur 2 afin d'accélérer sa vitesse de réchauffement.The cooling circuit 1 further comprises a first secondary pipe 10 connecting the outlet housing 3 to the pump 8. The circuit comprises a peripheral connected in the secondary pipe 10, in this case a heater 11. The cooling circuit 1 comprises a second secondary pipe 13 connecting the outlet housing 3 to the pipe 9 via a valve 14. This secondary pipe 13 makes it possible to directly send heated water from the engine 2 to the pump 8, so that that coolant reaches the pump 8 with a lower pressure drop than that generated by the heater 11 in the secondary pipe 10. The solenoid valve 14 is in particular open during the starting phases of the engine 2 to accelerate its operation. warming speed.

Un boîtier de dégazage 18 est destiné à éliminer les bulles présentes dans le liquide de refroidissement. Le boîtier 18 reçoit du liquide de refroidissement provenant du radiateur 7 par l'intermédiaire d'une conduite 17. Le liquide de refroidissement dégazé est refoulé dans la conduite 9. Selon l'invention, une commande d'ouverture de la vanne 5 provoque des ouvertures intermittentes de cette vanne même lorsque la température du liquide de refroidissement dans le boîtier de sortie 3 est inférieure au seuil d'ouverture. Les ouvertures intermittentes de la vanne 5 permettent de dégazer le liquide de refroidissement du boîtier de sortie 3 sans retarder excessivement le réchauffement du moteur 2 et sans accroître la complexité du circuit de refroidissement. Ainsi, le circuit de refroidissement illustré ne présente aucun conduit reliant directement le boîtier de sortie 3 au boîtier de dégazage 18.A degassing housing 18 is intended to remove bubbles present in the coolant. The housing 18 receives cooling liquid from the radiator 7 via a pipe 17. The degassed cooling liquid is discharged into the pipe 9. According to the invention, an opening command of the valve 5 causes intermittent openings of this valve even when the temperature of the coolant in the outlet housing 3 is below the opening threshold. The intermittent openings of the valve 5 make it possible to degas the coolant from the outlet housing 3 without unduly delaying the heating of the engine 2 and without increasing the complexity of the cooling circuit. Thus, the illustrated cooling circuit has no conduit directly connecting the outlet housing 3 to the degassing housing 18.

La commande pourra commander l'ouverture de la vanne 5 en fonction de la température ambiante, de la température d'eau et d'informations concernant le régime ou la charge du moteur. Dans la phase de démarrage du moteur, si la température d'eau est égale à la température ambiante, la commande pourra ouvrir la vanne 5 pendant plusieurs secondes. La commande pourra réaliser des ouvertures intermittentes de la vanne 5 avec un rapport cyclique avantageusement inférieur à 5 %.The control can control the opening of the valve 5 according to the ambient temperature, the water temperature and the information concerning the engine speed or load. In the starting phase of the engine, if the water temperature is equal to the ambient temperature, the control can open the valve 5 for several seconds. The control can make intermittent openings of the valve 5 with a duty cycle advantageously less than 5%.

Dans l'exemple illustré, une boîte de vitesses automatique 24 sert de transmission au moteur 2. La boîte de vitesses 24 comprend un échangeur de refroidissement 25, typiquement de type eau/huile, ainsi qu'une sonde de température 26. Un conduit 22 prélève du liquide de refroidissement sur la canalisation 9 en aval du radiateur 7 et le refoule à l'entrée de l'échangeur 25. Un conduit 23 prélève du liquide de refroidissement en sortie de l'échangeur 25 et le refoule dans la canalisation 9 en aval du piquage de la canalisation 22. Lorsque la vanne 5 est ouverte, un circuit d'eau de refroidissement alimente ainsi l'échangeur 25. La commande ouvre la vanne 5 lorsque température mesurée par la sonde de température 26 dépasse un seuil, même lorsque la température dans le boîtier de sortie 3 est inférieure au seuil d'ouverture de la vanne 5. Ainsi, la boîte de vitesses automatique 24 peut être refroidie même durant une phase de réchauffement du moteur 2, sans pour autant nécessiter un circuit de refroidissement complexe. En particulier, le circuit de refroidissement 1 illustré ne présente pas de dérivation entre un point en amont de l'échangeur de refroidissement 25 et un point du circuit de refroidissement en aval du boîtier de sortie 3. L'ouverture de la vanne 5 pourra également être commandée en fonction d'informations complémentaires provenant de la boîte de vitesses.In the illustrated example, an automatic gearbox 24 serves as transmission to the engine 2. The gearbox 24 comprises a cooling exchanger 25, typically of water / oil type, as well as a temperature sensor 26. A conduit 22 withdraws coolant on the pipe 9 downstream of the radiator 7 and delivers it to the inlet of the exchanger 25. A pipe 23 draws coolant at the outlet of the exchanger 25 and delivers it to the pipe 9 downstream of the sewing of the pipe 22. When the valve 5 is open, a cooling water circuit thus feeds the exchanger 25. The control opens the valve 5 when the temperature measured by the temperature sensor 26 exceeds a threshold, even when the temperature in the outlet housing 3 is less than the opening threshold of the valve 5. Thus, the automatic gearbox 24 can be cooled even during a heating phase of the engine 2, without for ant require a complex cooling circuit. In particular, the cooling circuit 1 illustrated does not show a shunt between a point upstream of the cooling exchanger 25 and a point of the cooling circuit downstream of the outlet housing 3. The opening of the valve 5 may also be controlled according to additional information from the gearbox.

L'ouverture de la vanne 5 sera commandée électroniquement. La sonde de température 4 permettra à la commande de déterminer lorsque la température du liquide de refroidissement dans le boîtier de sortie dépasse le seuil au-delà duquel le moteur 2 doit être refroidi. La vanne 5 sera alors ouverte au-delà de ce seuil. La vanne thermostatique pourra bien entendu comprendre une sécurité provoquant son ouverture automatique lorsque le liquide de refroidissement atteint une température trop élevée. La vanne pourra ainsi comprendre un organe en cire dont la dilatation provoque son ouverture.The opening of the valve 5 will be electronically controlled. The temperature probe 4 will allow the control to determine when the temperature of the coolant in the outlet housing exceeds the threshold beyond which the engine 2 is to be cooled. The valve 5 will then be open beyond this threshold. The thermostatic valve may of course include a security causing its automatic opening when the liquid of cooling reaches a temperature too high. The valve may thus comprise a wax member whose expansion causes it to open.

Le boîtier de sortie 3 comprend en outre une vanne obturant l'écoulement du liquide de refroidissement vers l'aérotherme 11. Lorsque le moteur 2 est arrêté, par exemple à l'arrêt du véhicule ou lorsque le moteur électrique est en mode propulsion pour un véhicule hybride, la commande pourra ouvrir cette vanne et fermer la vanne 5, pour permettre l'alimentation de l'aérotherme avec du liquide de refroidissement qui n'aura pas été refroidi dans le radiateur 7. Ainsi, le chauffage de l'habitacle pourra être réalisé lorsque le moteur 2 est à l'arrêt. Une fonction de prêt conditionnement de l'habitacle pourra notamment être réalisée. L'écoulement dans l'aérotherme 11 pourra être généré au moyen d'une pompe dédiée.The outlet housing 3 further comprises a valve closing the flow of the coolant to the heater 11. When the engine 2 is stopped, for example when the vehicle is stopped or when the electric motor is in propulsion mode for a hybrid vehicle, the control can open this valve and close the valve 5, to allow the supply of the heater with coolant that has not been cooled in the radiator 7. Thus, the heating of the passenger can be realized when the engine 2 is stopped. A lending function conditioning of the passenger compartment may in particular be carried out. The flow in the heater 11 may be generated by means of a dedicated pump.

Le circuit de refroidissement 1 comprend également un circuit de refroidissement d'air d'admission, utilisé par exemple pour refroidir de l'air d'admission comprimé par une turbine. Une pompe 27 refoule du liquide de refroidissement dans un conduit 30 débouchant sur une entrée d'un échangeur air/eau d'air d'admission 31. Une sortie de l'échangeur 31 refoule le liquide de refroidissement dans un radiateur secondaire 21 par l'intermédiaire d'un conduit 28. Le radiateur 21 est typiquement disposé dans la façade avant du véhicule, à proximité du radiateur 7. Une entrée de l'échangeur 31 reçoit du liquide de refroidissement provenant du moteur 2. En l'occurrence, cette entrée reçoit du liquide de refroidissement provenant de la canalisation 19. Une sortie de l'échangeur 31 est connectée au boîtier de sortie 3 par l'intermédiaire d'un conduit 29. Une vanne obture la communication entre l'échangeur 31 et le boîtier de sortie 3. Ainsi, pour réaliser le refroidissement de l'air d'admission, cette vanne sera fermée et la pompe 27 sera enclenchée pour que le radiateur 21 refroidisse le liquide de refroidissement traversant l'échangeur 31. Pour réaliser épisodiquement un réchauffage de l'air d'admission, par exemple pour l'activation de fonctions de type récupération thermique à l'échappement ou la régénération d'organes de dépollution tels que des filtres à particules ou des pièges à NOx, cette vanne sera ouverte et la pompe 27 sera arrêtée, de sorte que du liquide de refroidissement chaud sera prélevée dans la canalisation 19, traversera l'échangeur 31 pour réchauffer l'air d'admission, et sera refoulé dans le boîtier de sortie 3. La commande réalisera l'ouverture de cette vanne en fonction d'informations sur le besoin en air chaud en entrée de moteur, en fonction de la température extérieure, en fonction de la température mesurée par la sonde 4 et en fonction du régime ou de la charge du moteur.The cooling circuit 1 also comprises an intake air cooling circuit, used, for example, for cooling compressed intake air by a turbine. A pump 27 delivers cooling liquid into a conduit 30 leading to an inlet of an air / water intake air heat exchanger 31. An outlet of the exchanger 31 delivers the cooling liquid to a secondary radiator 21 via a The radiator 21 is typically disposed in the front of the vehicle, close to the radiator 7. An inlet of the exchanger 31 receives coolant from the engine 2. In this case, this inlet receives coolant from the pipe 19. An outlet of the exchanger 31 is connected to the outlet housing 3 via a conduit 29. A valve closes the communication between the exchanger 31 and the housing of 3. Thus, to achieve the cooling of the intake air, this valve will be closed and the pump 27 will be engaged so that the radiator 21 cools the coolant through the exchanger 31. For real episodically a reheating of the intake air, for example for the activation of functions of thermal recovery type exhaust or the regeneration of pollution control organs such as particulate filters or NOx traps, this valve will be open and pump 27 will be stopped, so that hot coolant will be taken from the pipe 19, pass through the heat exchanger 31 to heat the intake air, and will be discharged into the outlet housing 3. The control will realize the opening of this valve as a function of information on the need for hot air at the engine inlet, depending on the outside temperature, as a function of the temperature measured by the probe 4 and according to the engine speed or load.

La figure 2 représente de façon schématique un boîtier de sortie de liquide de refroidissement 3 et ses vannes permettant d'alimenter différentes parties du circuit de refroidissement 1. La vanne 34 obture la canalisation 10 vers l'aérotherme 11. La vanne 33 obture la canalisation 29 provenant de l'échangeur 31. La vanne 35 obture la canalisation 13. La commande 32 permet de commander l'ouverture et la fermeture de ces vannes.The figure 2 schematically represents a coolant outlet box 3 and its valves for supplying different parts of the cooling circuit 1. The valve 34 closes the pipe 10 towards the heater 11. The valve 33 closes the pipe 29 coming from the exchanger 31. The valve 35 closes the pipe 13. The control 32 controls the opening and closing of these valves.

La figure 3 représente le circuit alimenté lors d'une ouverture intermittente de la vanne 5. Du liquide de refroidissement est refoulé par le boîtier de sortie 3 dans le radiateur 7. Du liquide de refroidissement est refoulé par le radiateur 7 dans le boîtier de dégazage 18, et dans l'échangeur 25. Le liquide de refroidissement sortant du boîtier de dégazage 18 et de l'échangeur 25 est refoulé vers le boîtier de sortie 3.The figure 3 represents the circuit supplied during an intermittent opening of the valve 5. Coolant is discharged through the outlet housing 3 into the radiator 7. Coolant is discharged by the radiator 7 into the degassing housing 18, and in the exchanger 25. The coolant exiting the degassing housing 18 and the exchanger 25 is discharged to the outlet housing 3.

La figure 4 représente le circuit 1 alimenté lors d'une ouverture de la vanne 34 lorsque le moteur 2 est arrêté. La vanne 34 est ouverte, tandis que les vannes 5,33 et 35 sont fermées. Le liquide de refroidissement est refoulé par le boîtier de sortie 3 vers l'aérotherme 11, traverse le moteur et est refoulé dans le boîtier de sortie 3.The figure 4 represents the circuit 1 supplied during an opening of the valve 34 when the engine 2 is stopped. Valve 34 is open, while valves 5,33 and 35 are closed. The coolant is discharged through the outlet housing 3 to the heater 11, passes through the motor and is forced into the outlet housing 3.

La figure 5 représente le circuit 1 alimenté lors d'un réchauffement de l'air d'admission. La vanne 35 est ouverte de sorte que le débit refoulé par la pompe 8 dans le moteur 2 est accru. Du liquide de refroidissement provenant du moteur 2 traverse l'échangeur 31. La vanne 33 est ouverte, de sorte que le liquide de refroidissement refoulé par l'échangeur 31 est reçu par le boîtier de sortie 3.The figure 5 represents the circuit 1 supplied during a heating of the intake air. The valve 35 is open so that the flow rate discharged by the pump 8 into the engine 2 is increased. Coolant from the engine 2 passes through the exchanger 31. The valve 33 is open, so that the coolant discharged by the exchanger 31 is received by the outlet housing 3.

Le boîtier de sortie 3 pourra comprendre un actionneur coulissant dont la position définit l'ouverture ou la fermeture des vannes 5, 33,34 et 35. Les vannes 5, 33,34 et 35 pourront être des vannes tout ou rien ou proportionnelles.The outlet housing 3 may comprise a sliding actuator whose position defines the opening or closing of the valves 5, 33, 34 and 35. The valves 5, 33, 34 and 35 may be all or nothing or proportional valves.

Claims (8)

  1. A cooling circuit (1) of an engine including an outlet box (3) of the coolant originating from the engine (2); a radiator (7) for cooling the coolant originating from the outlet box; a degassing box (18) of the coolant originating from the radiator; a first valve (5) closing off the flow of the coolant between the outlet box and the radiator, the first valve (5) opening when the temperature of the coolant in the outlet box (3) exceeds a first threshold, further including an opening command (32) of the first valve (5), commanding intermittent openings of the first valve (5) even when the temperature of the coolant in the outlet box (3) is lower than said first threshold, characterized in that no duct directly connects the outlet box (3) to the degassing box (18).
  2. The cooling circuit according to Claim 1, including a diesel engine delivering coolant in the outlet box (3) .
  3. The cooling circuit according to any one of the preceding claims, further including a cooling exchanger (25) of an automatic gearbox (24) provided with a temperature sensor (26); a pump receiving coolant originating from the radiator (7) by means of a duct (9); in which a circuit (22, 23) takes coolant in the duct (9), passes through the cooling exchanger (25) and delivers the coolant in the duct (23), and in which the opening command (32) commands the opening of the first valve (5) when the temperature exceeds a second threshold.
  4. The cooling circuit according to any one of the preceding claims, including a sensor (4) of the temperature of the coolant in the outlet box (3), the opening command (32) commanding the opening of the first valve (5) when the temperature measured by this temperature sensor (4) exceeds the first threshold.
  5. The cooling circuit according to any one of the preceding claims, further including a heater (11) able to receiver coolant originating from the outlet box (3); a second valve (34) closing off the flow of the coolant between the outlet box (3) and the heater (11); a pump able to deliver coolant in the heater when the internal combustion engine is stopped; the opening command (32) commanding the opening of the second valve when the internal combustion engine is stopped.
  6. The cooling circuit according to Claim 5, further including a pump (8) delivering coolant in the engine, an outlet of the heater being connected to this pump; a bypass duct (13) directly connecting the outlet box (3) to said pump (8); a third valve (35) closing off the flow of the coolant in the bypass duct, the control (32) controlling selectively the opening of the third valve.
  7. The cooling circuit according to any one of the preceding claims, including a secondary radiator (21); a cooling exchanger of intake air (31), able to receive coolant originating from the engine (2) and to deliver this coolant in the outlet box (3); a pump (27) generating a flow between the intake air exchanger (31) and the secondary radiator (21) in a secondary circuit (28, 30); the outlet box (3) being provided with a fourth valve (33) closing off the flow of the coolant originating from the intake air cooling exchanger (31); the command (32) commanding by intermittence the stoppage of the pump (22) and the opening of the fourth valve (33).
  8. The cooling circuit according to Claims 1, 5, 6 and 7, in which the outlet box (3) includes a sliding actuator, the position of which defines the opening or closure of the first to fourth valves.
EP09155629.0A 2008-04-01 2009-03-19 Engine cooling circuit Active EP2112347B1 (en)

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FR3002976A1 (en) * 2013-03-05 2014-09-12 Peugeot Citroen Automobiles Sa METHOD FOR OPERATING A COOLING CIRCUIT
FR3036134B1 (en) * 2015-05-13 2019-04-19 Psa Automobiles Sa. ENGINE COOLING FLUID OUTPUT HOUSING
FR3036135A1 (en) * 2015-05-13 2016-11-18 Peugeot Citroen Automobiles Sa ENGINE COOLING CIRCUIT
FR3051872B1 (en) * 2016-05-24 2018-06-15 Peugeot Citroen Automobiles Sa POWER UNIT OF A VEHICLE
FR3051873B1 (en) * 2016-05-24 2018-06-15 Peugeot Citroen Automobiles Sa POWER UNIT OF A VEHICLE
FR3051871B1 (en) * 2016-05-24 2018-06-15 Peugeot Citroen Automobiles Sa CALORIE EXCHANGE CONTROL DEVICE BETWEEN A MANUAL GEARBOX OF A VEHICLE AND A HEAT PUMP FLUID
FR3079559A1 (en) * 2018-03-27 2019-10-04 Psa Automobiles Sa WATER OUTPUT BOX AND THERMAL MANAGEMENT DEVICE OF A VEHICLE MOTOR POWERTRAIN
FR3085999B1 (en) * 2018-09-13 2020-09-04 Psa Automobiles Sa PROCESS FOR PROTECTION AGAINST GLAZING FROM A HEAT TRANSFER FLUID IN A COOLING SYSTEM OF A THERMAL ENGINE
FR3087488B1 (en) * 2018-10-23 2020-12-18 Psa Automobiles Sa PROCESS FOR EARLY OPENING OF A COLD THERMOSTAT IN AN ENGINE COOLING SYSTEM
FR3088677B1 (en) * 2018-11-20 2020-11-13 Psa Automobiles Sa METHOD AND DEVICE FOR COOLING AN INTERNAL COMBUSTION ENGINE

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