EP2090763B1 - Engine cooling circuit - Google Patents

Engine cooling circuit Download PDF

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Publication number
EP2090763B1
EP2090763B1 EP20090152220 EP09152220A EP2090763B1 EP 2090763 B1 EP2090763 B1 EP 2090763B1 EP 20090152220 EP20090152220 EP 20090152220 EP 09152220 A EP09152220 A EP 09152220A EP 2090763 B1 EP2090763 B1 EP 2090763B1
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EP
European Patent Office
Prior art keywords
cooling circuit
coolant
circuit according
engine
flow
Prior art date
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Expired - Fee Related
Application number
EP20090152220
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German (de)
French (fr)
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EP2090763A1 (en
Inventor
Pierre Dumoulin
Armel Le Lievre
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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Publication of EP2090763A1 publication Critical patent/EP2090763A1/en
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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
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • 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
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • 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
    • F01P2031/00—Fail safe
    • F01P2031/16—Fail safe using melting materials

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.
  • the circulation of water 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 is used to directly send the heated water from the engine to the upstream portion of the cooling circuit positioned before said motor, through the housing.
  • 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 cooling circuit has been cut.
  • Such a cooling circuit has drawbacks.
  • the water temperature measured by the thermostat is not very representative of the engine water temperature. Therefore, when the engine overheats, the thermostat will not necessarily open or too late to allow water to reach the radiator and participate in cooling the engine.
  • this circuit requires an additional bypass line between the water outlet housing and the pump to provide reliable temperature measurement at the probe.
  • the invention aims to solve one or more of these disadvantages.
  • the invention thus relates to a cooling circuit of an internal combustion engine of a motor vehicle, comprising a coolant outlet housing adapted to receive coolant from the engine; a pipe permanently conveying coolant from the outlet box to the engine; a cooling radiator adapted to receive coolant from the outlet housing; a temperature probe placed in the housing; a thermostatic valve closing the flow of coolant between the outlet box and the radiator; a deflector disposed in the housing and guiding a flow of coolant to the pipe, the temperature sensor and the thermostatic valve being disposed in this flow.
  • the thermostatic valve is disposed close to the temperature probe.
  • the thermostatic valve comprises a fuse membrane, the melting of this membrane releasing the flow between the housing and the radiator.
  • the thermostatic valve comprises a member whose thermal expansion displaces a seal and releases the flow between the outlet box and the radiator beyond a predefined temperature.
  • the body is made of wax.
  • said pipe has an inlet of which a portion is free of closure, the portion to which the baffle guides the flow.
  • the circuit comprises a device connected in the pipe between the output box and the motor, and comprises a shutter adapted to selectively close the inlet of the pipe except for said portion.
  • said device is a heater.
  • the shutter is slidably mounted in the housing between an open position of the inlet of the pipe and a closed position of the inlet of the pipe except for said portion.
  • the circuit comprises a pump for circulating the coolant in the circuit and connected between the output housing and the motor.
  • the deflector is disposed vis-à-vis the temperature sensor and the thermostatic valve.
  • the invention proposes a cooling circuit provided with an outlet box and a pipe permanently conveying coolant from the outlet box to the engine.
  • a deflector disposed in the housing guides a flow of coolant to the pipe, a thermostatic valve closing the connection to the radiator and a temperature sensor being disposed in this flow.
  • the temperature probe and the thermostatic valve will be subjected to a temperature representative of the engine temperature.
  • the engine control will have a more reliable temperature measurement and the risk of overheating of the engine will be reduced due to an opening of the valve when the coolant reaches its target temperature.
  • 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 closes the flow of liquid between the outlet housing 3 and a radiator 7 below a predetermined 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 returns the radiator cooling liquid 7 to a pump 8.
  • the pump 8 delivers the cooling liquid into the engine pipes 2. After passing through these pipes, the coolant is received in the outlet housing 3. Part of the coolant discharged into these pipes passes through a water / oil radiator 20.
  • a conduit 19 discharges the coolant from the radiator water / 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 duct 13 connecting the outlet housing 3 to the duct 9 via a proportional solenoid valve 14.
  • This secondary duct 13 makes it possible to directly send heated water from the engine 2 to the pump 8, so 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 engine 2 startup phases to accelerate its rate of warming.
  • a pipe permanently conveys liquid from the outlet housing 3 to the engine 2.
  • the figure 2 is a schematic sectional view of the outlet housing 3.
  • the secondary pipe 10 is used to convey the liquid permanently to the engine 2.
  • the use of a pipe for feeding a device allows avoid using a pipe dedicated to the maintenance of the flow when all the valves are closed.
  • a portion of the secondary pipe 10 is free of closure.
  • a shutter 31 is able to selectively close the inlet of the pipe 10, with the exception of a portion intended to convey the cooling liquid permanently to the engine 2.
  • the shutter 31 is slidably mounted in the housing 3 between an open position of the inlet of the pipe 10 and a closed position of this inlet with the exception of the portion intended for the permanent flow.
  • the junction between the pipe 10 and the outlet housing 3 may also have a protrusion not closed by the shutter 31.
  • the permanent passage portion may for example comprise a section between 8 and 20 mm 2 .
  • a deflector 32 is disposed in the housing 3 and guides a coolant flow (illustrated by the dashed arrow) to the closed portion.
  • the deflector 32 is arranged so that the thermostatic valve 5 and the temperature sensor 4 are arranged in this flow.
  • the deflector 32 will advantageously be arranged vis-à-vis the temperature sensor 4 and the thermostatic valve 5, to better guide the flow on these components.
  • the temperature sensor 4 and the thermostatic valve 5 will be subjected to a coolant temperature representative of the engine temperature.
  • the probe 4 and the valve 5 are advantageously arranged close to each other.
  • the deflector 32 illustrated has a rectilinear section.
  • a deflector according to the invention may have any suitable forms for guiding the flow as a function of the geometry of the coolant outlet box 3
  • thermostatic valves 5 Different types of thermostatic valves 5, known to those skilled in the art, may be used.
  • the thermostatic valve may in particular comprise a member 51 whose thermal expansion displaces a seal and thus releases the flow in the conduit 6 between the outlet housing 3 and the radiator 7 beyond a predefined temperature.
  • the dilation member 51 may in particular be made of wax.
  • Other thermostatic valves may have a fusible membrane melting at a safety temperature in order to connect the outlet housing 3 with the radiator 7.
  • Other thermostatic valves 5 may in particular include a thermomechanical closure member.

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 le débit d'eau interne moteur 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, la circulation du liquide de refroidissement est progressivement rétablie.It is known to use valves to completely cut the engine internal water flow during 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, the circulation of coolant is gradually restored.

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. 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, en traversant le boîtier. 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 le circuit de refroidissement a été coupé.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. The circulation of water 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 is used to directly send the heated water from the engine to the upstream portion of the cooling circuit positioned before said motor, through the housing. 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 cooling circuit has been cut.

Un tel circuit de refroidissement présente des inconvénients. D'une part, en cas de défaillance de la sonde, la température d'eau mesurée par le thermostat est peu représentative de la température d'eau moteur. Par conséquent, lors d'une surchauffe du moteur, le thermostat ne s'ouvrira pas forcément ou trop tardivement pour permettre à l'eau d'atteindre le radiateur et de participer au refroidissement du moteur. Par ailleurs, ce circuit nécessite une conduite de dérivation supplémentaire entre le boîtier de sortie d'eau et la pompe pour assurer une mesure de température fiable au niveau de la sonde.Such a cooling circuit has drawbacks. On the one hand, in the event of a probe failure, the water temperature measured by the thermostat is not very representative of the engine water temperature. Therefore, when the engine overheats, the thermostat will not necessarily open or too late to allow water to reach the radiator and participate in cooling the engine. Furthermore, this circuit requires an additional bypass line between the water outlet housing and the pump to provide reliable temperature measurement at the probe.

L'invention vise à résoudre un ou plusieurs de ces inconvénients. L'invention porte ainsi sur un circuit de refroidissement d'un moteur à combustion interne de véhicule automobile, comprenant un boîtier de sortie de liquide de refroidissement apte à recevoir du liquide de refroidissement en provenance du moteur ; une canalisation acheminant de façon permanente du liquide de refroidissement depuis le boîtier de sortie vers le moteur ; un radiateur de refroidissement apte à recevoir du liquide de refroidissement en provenance du boîtier de sortie ; une sonde de température placée dans le boîtier ; une vanne thermostatique obturant l'écoulement du liquide de refroidissement entre le boîtier de sortie et le radiateur ; un déflecteur disposé dans le boîtier et guidant un écoulement de liquide de refroidissement jusqu'à la canalisation, la sonde de température et la vanne thermostatique étant disposées dans cet écoulement.The invention aims to solve one or more of these disadvantages. The invention thus relates to a cooling circuit of an internal combustion engine of a motor vehicle, comprising a coolant outlet housing adapted to receive coolant from the engine; a pipe permanently conveying coolant from the outlet box to the engine; a cooling radiator adapted to receive coolant from the outlet housing; a temperature probe placed in the housing; a thermostatic valve closing the flow of coolant between the outlet box and the radiator; a deflector disposed in the housing and guiding a flow of coolant to the pipe, the temperature sensor and the thermostatic valve being disposed in this flow.

Selon une variante, la vanne thermostatique est disposée à proximité de la sonde de température.According to one variant, the thermostatic valve is disposed close to the temperature probe.

Selon encore une variante, la vanne thermostatique comprend une membrane fusible, la fusion de cette membrane libérant l'écoulement entre le boîtier et le radiateur.According to another variant, the thermostatic valve comprises a fuse membrane, the melting of this membrane releasing the flow between the housing and the radiator.

Selon une autre variante, la vanne thermostatique comprend un organe dont la dilatation thermique déplace un joint d'étanchéité et libère l'écoulement entre le boîtier de sortie et le radiateur au-delà d'une température prédéfinie.According to another variant, the thermostatic valve comprises a member whose thermal expansion displaces a seal and releases the flow between the outlet box and the radiator beyond a predefined temperature.

Selon encore une autre variante, l'organe est réalisé en cire.According to yet another variant, the body is made of wax.

Selon une variante, ladite canalisation présente une entrée dont une portion est dénuée de fermeture, portion vers laquelle le déflecteur guide l'écoulement.According to a variant, said pipe has an inlet of which a portion is free of closure, the portion to which the baffle guides the flow.

Selon une autre variante, le circuit comprend un périphérique connecté dans la canalisation entre le boîtier de sortie et le moteur, et comprend un obturateur apte à fermer sélectivement l'entrée de la canalisation à l'exception de ladite portion.According to another variant, the circuit comprises a device connected in the pipe between the output box and the motor, and comprises a shutter adapted to selectively close the inlet of the pipe except for said portion.

Selon encore une autre variante, ledit périphérique est un aérotherme.According to yet another variant, said device is a heater.

Selon une variante, l'obturateur est monté coulissant dans le boîtier entre une position d'ouverture de l'entrée de la canalisation et une position de fermeture de l'entrée de la canalisation à l'exception de ladite portion.Alternatively, the shutter is slidably mounted in the housing between an open position of the inlet of the pipe and a closed position of the inlet of the pipe except for said portion.

Selon encore une autre variante, le circuit comprend une pompe assurant la circulation du liquide de refroidissement dans le circuit et connectée entre le boîtier de sortie et le moteur.According to yet another variant, the circuit comprises a pump for circulating the coolant in the circuit and connected between the output housing and the motor.

Selon une autre variante, le déflecteur est disposé en vis-à-vis de la sonde de température et de la vanne thermostatique.According to another variant, the deflector is disposed vis-à-vis the temperature sensor and the thermostatic valve.

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 vue en coupe d'un boîtier de sortie de liquide de refroidissement d'un circuit selon l'invention.
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 sectional view of a coolant outlet housing of a circuit according to the invention.

L'invention propose un circuit de refroidissement muni d'un boîtier de sortie et d'une canalisation acheminant de façon permanente du liquide de refroidissement depuis le boîtier de sortie vers le moteur. Un déflecteur disposé dans le boîtier guide un écoulement du liquide de refroidissement jusqu'à la canalisation, une vanne thermostatique obturant la liaison vers le radiateur et une sonde de température étant disposées dans cet écoulement.The invention proposes a cooling circuit provided with an outlet box and a pipe permanently conveying coolant from the outlet box to the engine. A deflector disposed in the housing guides a flow of coolant to the pipe, a thermostatic valve closing the connection to the radiator and a temperature sensor being disposed in this flow.

Ainsi, la sonde de température et la vanne thermostatique seront soumises à une température représentative de la température moteur. Ainsi, le contrôle moteur disposera d'une mesure de température plus fiable et les risques de surchauffe du moteur seront réduits du fait d'une ouverture de la vanne lorsque le liquide de refroidissement atteint sa température de consigne.Thus, the temperature probe and the thermostatic valve will be subjected to a temperature representative of the engine temperature. Thus, the engine control will have a more reliable temperature measurement and the risk of overheating of the engine will be reduced due to an opening of the valve when the coolant reaches its target temperature.

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 obture sélectivement l'écoulement du liquide entre le boîtier de sortie 3 et un radiateur 7 en dessous d'une température déterminée. 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 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 closes the flow of liquid between the outlet housing 3 and a radiator 7 below a predetermined 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 returns the radiator cooling liquid 7 to a pump 8. The pump 8 delivers the cooling liquid into the engine pipes 2. After passing through these pipes, the coolant is received in the outlet housing 3. Part of the coolant discharged into these pipes passes through a water / oil radiator 20. A conduit 19 discharges the coolant from the radiator water / 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 électrovanne proportionnelle 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 duct 13 connecting the outlet housing 3 to the duct 9 via a proportional solenoid valve 14. This secondary duct 13 makes it possible to directly send heated water from the engine 2 to the pump 8, so 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 engine 2 startup phases to accelerate its rate of warming.

Dans le circuit de refroidissement 1 selon l'invention, une canalisation achemine de façon permanente du liquide depuis le boîtier de sortie 3 jusqu'au moteur 2. La figure 2 est une vue en coupe schématique du boîtier de sortie 3. En l'occurrence, la canalisation secondaire 10 est utilisée pour acheminer le liquide de façon permanente jusqu'au moteur 2. L'utilisation d'une canalisation destinée à alimenter un périphérique permet d'éviter d'utiliser une canalisation dédiée au maintien de l'écoulement lorsque l'ensemble des vannes sont fermées.In the cooling circuit 1 according to the invention, a pipe permanently conveys liquid from the outlet housing 3 to the engine 2. The figure 2 is a schematic sectional view of the outlet housing 3. In this case, the secondary pipe 10 is used to convey the liquid permanently to the engine 2. The use of a pipe for feeding a device allows avoid using a pipe dedicated to the maintenance of the flow when all the valves are closed.

Une portion de la canalisation secondaire 10 est dénuée de fermeture. Un obturateur 31 est apte à fermer sélectivement l'entrée de la canalisation 10, à l'exception d'une portion destinée à acheminer le liquide de refroidissement de façon permanente jusqu'au moteur 2. L'obturateur 31 est monté coulissant dans le boîtier 3 entre une position d'ouverture de l'entrée de la canalisation 10 et une position de fermeture de cette entrée à l'exception de la portion destinée à l'écoulement permanent. La jonction entre la canalisation 10 et le boîtier de sortie 3 pourra également présenter une excroissance non obturée par l'obturateur 31. La portion de passage permanent pourra par exemple comprendre une section comprise entre 8 et 20 mm2.A portion of the secondary pipe 10 is free of closure. A shutter 31 is able to selectively close the inlet of the pipe 10, with the exception of a portion intended to convey the cooling liquid permanently to the engine 2. The shutter 31 is slidably mounted in the housing 3 between an open position of the inlet of the pipe 10 and a closed position of this inlet with the exception of the portion intended for the permanent flow. The junction between the pipe 10 and the outlet housing 3 may also have a protrusion not closed by the shutter 31. The permanent passage portion may for example comprise a section between 8 and 20 mm 2 .

Un déflecteur 32 est disposé dans le boîtier 3 et guide un écoulement de liquide de refroidissement (illustré par la flèche en pointillé) jusqu'à la portion dénuée de fermeture. Le déflecteur 32 est disposé de sorte que la vanne thermostatique 5 et la sonde de température 4 sont disposées dans cet écoulement. Le déflecteur 32 sera avantageusement disposé en vis-à-vis de la sonde de température 4 et de la vanne thermostatique 5, afin de mieux guider l'écoulement sur ces composants.A deflector 32 is disposed in the housing 3 and guides a coolant flow (illustrated by the dashed arrow) to the closed portion. The deflector 32 is arranged so that the thermostatic valve 5 and the temperature sensor 4 are arranged in this flow. The deflector 32 will advantageously be arranged vis-à-vis the temperature sensor 4 and the thermostatic valve 5, to better guide the flow on these components.

Ainsi, la sonde de température 4 et la vanne thermostatique 5 seront soumises à une température de liquide de refroidissement représentative de la température moteur. Afin de diminuer la taille nécessaire pour le déflecteur 32, la sonde 4 et la vanne 5 sont avantageusement disposées à proximité l'une de l'autre. Le déflecteur 32 illustré présente une section rectiligne. Cependant, un déflecteur selon l'invention pourra présenter toutes formes appropriées au guidage de l'écoulement en fonction de la géométrie du boîtier de sortie de liquide de refroidissement 3Thus, the temperature sensor 4 and the thermostatic valve 5 will be subjected to a coolant temperature representative of the engine temperature. In order to reduce the size required for the deflector 32, the probe 4 and the valve 5 are advantageously arranged close to each other. The deflector 32 illustrated has a rectilinear section. However, a deflector according to the invention may have any suitable forms for guiding the flow as a function of the geometry of the coolant outlet box 3

Différents types de vannes thermostatiques 5, connus de l'homme du métier, pourront être utilisés. La vanne thermostatique pourra notamment comprendre un organe 51 dont la dilatation thermique déplace un joint d'étanchéité et libère ainsi l'écoulement dans le conduit 6 entre le boîtier de sortie 3 et le radiateur 7 au-delà d'une température prédéfinie. L'organe de dilatation 51 pourra notamment être réalisé en cire. D'autres vannes thermostatiques pourront présenter une membrane fusible, fondant à une température de sécurité afin de mettre en communication le boîtier de sortie 3 avec le radiateur 7. D'autres vannes thermostatiques 5 pourront notamment comprendre un organe d'obturation thermomécanique.Different types of thermostatic valves 5, known to those skilled in the art, may be used. The thermostatic valve may in particular comprise a member 51 whose thermal expansion displaces a seal and thus releases the flow in the conduit 6 between the outlet housing 3 and the radiator 7 beyond a predefined temperature. The dilation member 51 may in particular be made of wax. Other thermostatic valves may have a fusible membrane melting at a safety temperature in order to connect the outlet housing 3 with the radiator 7. Other thermostatic valves 5 may in particular include a thermomechanical closure member.

Claims (11)

  1. Internal combustion engine cooling circuit (1) comprising a coolant outlet box (3) able to receive coolant from the engine (2); a line (10) permanently carrying coolant from the outlet box (3) to the engine (2); a cooling radiator (7) able to receive coolant from the outlet box; a temperature sensor (4) positioned in the box (3); a thermostatic valve (5) shutting off the flow of coolant between the outlet box and the radiator; characterized in that it further comprises a deflector (32) positioned in the box (3) and guiding a flow of coolant to the line, the temperature sensor (4) and the thermostatic valve (5) being positioned in this flow.
  2. Cooling circuit according to Claim 1, in which the deflector (32) is positioned facing the temperature sensor (4) and the thermostatic valve (5).
  3. Cooling circuit according to Claim 1 or 2, in which the thermostatic valve (5) is positioned near the temperature sensor (4).
  4. Cooling circuit according to Claim 1 or 2, in which the thermostatic valve (5) comprises a meltable membrane, the melting of this membrane opening the flow between the box and the radiator.
  5. Cooling circuit according to Claim 1 or 2, in which the thermostatic valve comprises a member (51) the thermal expansion of which moves a seal and opens the flow between the outlet box (3) and the radiator (7) when the temperature surpasses a predefined temperature.
  6. Cooling circuit according to Claim 5, in which the said member (51) is made of wax.
  7. Cooling circuit according to any one of the preceding claims, in which the line (10) has an inlet one portion of which is unclosed, towards which portion the deflector guides the flow.
  8. Cooling circuit according to Claim 7, comprising a peripheral (11) connected in the line between the outlet box and the engine, and comprising a shut-up member (31) capable selectively of closing the entry to the line (10) with the exception of the said portion.
  9. Cooling circuit according to Claim 8, in which the said peripheral is a unit heater (11).
  10. Cooling circuit according to Claim 8 or 9, in which the said shut-off member (31) is mounted in the box such that it can slide between a position in which the entrance to the line is open and a position in which the entrance to the line is closed with the exception of the said portion.
  11. Cooling circuit according to any one of the preceding claims, comprising a pump (8) for circulating the coolant around the circuit and which is connected between the outlet box (3) and the engine (2).
EP20090152220 2008-02-14 2009-02-05 Engine cooling circuit Expired - Fee Related EP2090763B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0850933A FR2927660B1 (en) 2008-02-14 2008-02-14 ENGINE COOLING CIRCUIT

Publications (2)

Publication Number Publication Date
EP2090763A1 EP2090763A1 (en) 2009-08-19
EP2090763B1 true EP2090763B1 (en) 2010-11-17

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Application Number Title Priority Date Filing Date
EP20090152220 Expired - Fee Related EP2090763B1 (en) 2008-02-14 2009-02-05 Engine cooling circuit

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EP (1) EP2090763B1 (en)
DE (1) DE602009000354D1 (en)
ES (1) ES2355793T3 (en)
FR (1) FR2927660B1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1091666A (en) * 1965-10-25 1967-11-22 British Thermostat Co Ltd Improvements in thermostatically-controlled valves
FR2618847B1 (en) * 1987-07-31 1992-08-14 Peugeot COOLANT OUTLET HOUSING FOR DIESEL ENGINE
US4981260A (en) * 1989-10-23 1991-01-01 Automotive Products Company Failsafe thermostat for water-cooled engines
DE19537068A1 (en) * 1995-10-05 1997-04-10 Bayerische Motoren Werke Ag Thermostatic valve for the cooling circuit of an internal combustion engine
FR2903143B1 (en) 2006-06-29 2008-09-26 Peugeot Citroen Automobiles Sa COOLING SYSTEM OF A MOTOR VEHICLE ENGINE COMPRISING A LIQUID CIRCULATION TUBE FOR A TEMPERATURE PROBE

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DE602009000354D1 (en) 2010-12-30
ES2355793T3 (en) 2011-03-31
FR2927660A1 (en) 2009-08-21
FR2927660B1 (en) 2010-02-12
EP2090763A1 (en) 2009-08-19

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