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EP0670414A1 - Cooling system for an internal combustion engine - Google Patents

Cooling system for an internal combustion engine Download PDF

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Publication number
EP0670414A1
EP0670414A1 EP95400428A EP95400428A EP0670414A1 EP 0670414 A1 EP0670414 A1 EP 0670414A1 EP 95400428 A EP95400428 A EP 95400428A EP 95400428 A EP95400428 A EP 95400428A EP 0670414 A1 EP0670414 A1 EP 0670414A1
Authority
EP
European Patent Office
Prior art keywords
liquid
alternator
circuit
cooling system
engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95400428A
Other languages
German (de)
French (fr)
Other versions
EP0670414B1 (en
Inventor
Anne Tugaye
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.)
Renault SAS
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0670414A1 publication Critical patent/EP0670414A1/en
Application granted granted Critical
Publication of EP0670414B1 publication Critical patent/EP0670414B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01P3/00—Liquid cooling
    • F01P3/12—Arrangements for cooling other engine or machine parts
    • 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
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/029—Expansion reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
    • F01P2003/185—Arrangements or mounting of liquid-to-air heat-exchangers arranged in parallel
    • 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
    • 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
    • F01P2060/08—Cabin heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/18—Heater
    • F01P2060/185—Heater for alternators or generators
    • 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
    • F01P3/00—Liquid cooling
    • F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
    • 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

Definitions

  • the present invention relates to a cooling system for an internal combustion engine fitted to a motor vehicle.
  • the invention relates more particularly to a cooling system adapted to allow the cooling of the alternator driven by the engine.
  • alternators of internal combustion engines are generally fixed on a support mounted on the wall of the engine block so as to allow the drive of the rotor shaft by the crankshaft by means of a simple belt.
  • alternators are made up of electrical components which no longer function perfectly reliably when the ambient temperature becomes too high.
  • the most used method to ensure correct cooling of an alternator consists of adding one or more internal or external fans integral with the rotor shaft.
  • this method does not always allow sufficient cooling, in particular for motor vehicle alternators, the performance of which is higher and higher in an increasingly smaller footprint.
  • the alternator cooling system is connected to the coolant inlet manifold of the engine block.
  • the integration of the alternator in the cooling system at the pump outlet and in parallel with the engine block makes balancing the flow rates difficult and does not ensure a sufficient flow of coolant through the alternator and therefore ensure satisfactory cooling of the latter.
  • the object of the present invention is to further improve the efficiency of a liquid cooling system for an internal combustion engine of a motor vehicle enabling the alternator to be cooled in a simple manner.
  • the liquid cooling system for an internal combustion engine fitted to a motor vehicle comprises an internal circuit passing through the engine block, a main heat exchanger of the liquid / air type and a pump driving the liquid.
  • the cooling system is characterized in that it comprises a derivative cooling circuit serving an alternator driven by the engine by which the coolant introduced into the alternator is taken out of the internal circuit of the engine block and is driven back to the input of said internal circuit.
  • the derived cooling circuit comprises a secondary liquid / air exchanger disposed upstream of the alternator.
  • the circulation inside the derived cooling circuit is controlled by a thermostat.
  • the derivative cooling circuit of the alternator is connected on the one hand, upstream in the direction of the flow of the coolant, to the pipe which connects the outlet of the internal circuit of the engine block at the inlet of the main heat exchanger, and on the other hand downstream, to the pipe which connects the outlet of the main heat exchanger to the inlet of the internal circuit of the block engine.
  • the structural characteristics of the main heat exchanger and of the secondary exchanger are adapted as a function of the respective flow rates of coolant which pass through them.
  • the main heat exchanger and the secondary exchanger are arranged in two separate places in the engine compartment.
  • FIG. 1 therefore shows a cooling system, identified by the reference 1 in the drawing, by liquid (generally water added with an antifreeze and an anti-corrosion product) more particularly intended for the cooling of a combustion engine internal 2, for example of the multicylinder type fitted to a motor vehicle. Only the elements necessary for understanding the invention have been shown.
  • liquid generally water added with an antifreeze and an anti-corrosion product
  • the liquid cooling system presented conventionally comprises an internal circuit 12 (also called water chambers) passing through the engine block 2 to cool the combustion chambers.
  • the coolant is cooled by an air sweep in a radiator constituted by a main liquid / air heat exchanger 4.
  • the liquid is driven by a pump 3 placed immediately upstream of the internal circuit 12 of the engine 2.
  • the pipe 10 connecting the output of the internal circuit 12 to the main exchanger 4 includes a thermostat 5 which defines a bypass connection 13 serving an air heater 6 for heating the home and an expansion tank 7.
  • a pipe 11 ensures the return of the liquid from the main exchanger 4 to the inlet of the internal circuit 12.
  • the cooling system includes plus a derivative cooling circuit 14 comprising a secondary liquid / air exchanger 8 and the alternator 9.
  • the cooling liquid introduced into the alternator is taken at the outlet of the internal circuit 12 of the engine 2 and is turned back at the entrance of the latter.
  • the cooling circuit 14 of the alternator 9 is connected on the one hand, upstream in the direction of the flow of the coolant, to the pipe 10 which connects the outlet of the internal circuit 12 of the engine block 2 at the inlet of the main heat exchanger 4, the connection being able to be made before (cf. FIG. 1) or after the thermostat 5, and on the other hand downstream, to the pipe 11 which connects the outlet of the main heat exchanger 4 at the input of the internal circuit 12 of the engine block 2.
  • connection of the branch circuit 14 intended for cooling the alternator 9, at the outlet of the internal circuit 12 of the engine 2 makes it possible to significantly increase the flow of liquid through the alternator 9 whatever the operating point of the engine. , and therefore to improve the elimination of calories in comparison with known systems in which the derived circuit is supplied upstream of the internal circuit 12 of the motor 2.
  • the higher temperature of the liquid leaving the motor 2 is largely attenuated by the secondary temperature exchanger 8 disposed upstream of the alternator 9.
  • the amount of additional heat transmitted to the coolant by the alternator 9 requires increasing the power which can be removed by the main exchanger 4.
  • the solution adopted in accordance with the present invention d '' using a secondary exchanger 8 disposed in the branch circuit in which only a part of the overall flow circulates makes it possible to reduce the necessary exchange surfaces, moreover this secondary exchanger can be geographically dissociated from the main exchanger, which allows optimize the installation of the cooling system in the engine compartment of the motor vehicle.
  • the separation of the heat exchangers 4 and 8 also makes it possible to use for each of them technical solutions offering different heat exchange characteristics (shapes of the fins, of the bundles, etc.).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

The liquid cooling system for an internal combustion engine (2) fitted to a vehicle includes an internal circuit (12) passing through the engine block, a main liquid/air heat exchanger (4) and a pump (3) circulating the liquid. A further branch of the circuit (14) serves an alternator (9) driven by the engine. This branch draws off some of the liquid leaving the engine block (2) and passes it through the alternator to be returned to the pipe which feeds liquid into the engine block. An auxiliary liquid/air heat exchanger is provided in this branch upstream of the alternator to ensure a supply of cooled liquid to the alternator. The flow in the branch circuit is controlled by a thermostat.

Description

La présente invention concerne un système de refroidissement pour un moteur à combustion interne équipant un véhicule automobile. L'invention concerne plus particulièrement un système de refroidissement adapté pour permettre le refroidissement de l'alternateur entraîné par le moteur.The present invention relates to a cooling system for an internal combustion engine fitted to a motor vehicle. The invention relates more particularly to a cooling system adapted to allow the cooling of the alternator driven by the engine.

Les alternateurs des moteurs à combustion interne sont généralement fixés sur un support monté sur la paroi du bloc moteur de façon à permettre l'entraînement de l'arbre du rotor par le vilebrequin par l'intermédiaire d'une simple courroie. Or, les alternateurs sont constitués de composants électriques qui ne fonctionnent plus de façon parfaitement fiable lorsque la température ambiante devient trop élevée.The alternators of internal combustion engines are generally fixed on a support mounted on the wall of the engine block so as to allow the drive of the rotor shaft by the crankshaft by means of a simple belt. However, alternators are made up of electrical components which no longer function perfectly reliably when the ambient temperature becomes too high.

Il en résulte que le dégagement de chaleur produit par l'alternateur en fonctionnement et par l'environnement du moteur, engendre une augmentation de la température ambiante rendant nécessaire de prévoir un dispositif de refroidissement de l'alternateur.As a result, the heat generated by the alternator in operation and by the engine environment, increases the ambient temperature making it necessary to provide a cooling device for the alternator.

La méthode la plus utilisée pour assurer un refroidissement correct d'un alternateur consiste en l'adjonction d'un ou plusieurs ventilateurs internes ou externes solidaires de l'arbre du rotor. Toutefois, cette méthode ne permet pas toujours un refroidissement suffisant en particulier pour les alternateurs de véhicule automobile dont les performances sont de plus en plus élevées dans un encombrement de plus en plus réduit.The most used method to ensure correct cooling of an alternator consists of adding one or more internal or external fans integral with the rotor shaft. However, this method does not always allow sufficient cooling, in particular for motor vehicle alternators, the performance of which is higher and higher in an increasingly smaller footprint.

Une autre méthode qui permet d'obtenir un refroidissement plus efficace a été développée notamment dans le document FR-A-2.658.959. Elle consiste à ménager des canaux dans l'alternateur et à y faire circuler le liquide collecteur de calories utilisé pour refroidir le moteur. Le document JP-A-83557/1984 divulgue ainsi un système de refroidissement par liquide pour un moteur de véhicule automobile adapté pour permettre la circulation du liquide de refroidissement à l'intérieur de l'alternateur.Another method which makes it possible to obtain more efficient cooling has been developed in particular in document FR-A-2,658.959. It consists of creating channels in the alternator and circulating therein the calorie-collecting liquid used to cool the engine. Document JP-A-83557/1984 thus discloses a liquid cooling system for a motor vehicle engine adapted to allow the circulation of the coolant inside the alternator.

Selon ce document de l'art antérieur le système de refroidissement de l'alternateur est raccordé au collecteur d'entrée du liquide de refroidissement du bloc moteur. L'intégration de l'alternateur dans le système de refroidissement à la sortie de la pompe et en parallèle au bloc moteur rend l'équilibrage des débits difficile et ne permet pas d'assurer un débit suffisant du liquide de refroidissement à travers l'alternateur et donc d'assurer un refroidissement satisfaisant de ce dernier.According to this document of the prior art, the alternator cooling system is connected to the coolant inlet manifold of the engine block. The integration of the alternator in the cooling system at the pump outlet and in parallel with the engine block makes balancing the flow rates difficult and does not ensure a sufficient flow of coolant through the alternator and therefore ensure satisfactory cooling of the latter.

Le but de la présente invention est d'améliorer encore l'efficacité d'un système de refroidissement par liquide pour moteur à combustion interne de véhicule automobile permettant de réaliser de façon simple le refroidissement de l'alternateur.The object of the present invention is to further improve the efficiency of a liquid cooling system for an internal combustion engine of a motor vehicle enabling the alternator to be cooled in a simple manner.

Le système de refroidissement par liquide pour moteur à combustion interne équipant un véhicule automobile selon l'invention comporte un circuit interne traversant le bloc moteur, un échangeur de chaleur principal du type liquide/air et une pompe entraînant le liquide.The liquid cooling system for an internal combustion engine fitted to a motor vehicle according to the invention comprises an internal circuit passing through the engine block, a main heat exchanger of the liquid / air type and a pump driving the liquid.

Selon l'invention le système de refroidissement est caractérisé en ce qu'il comprend un circuit de refroidissement dérivé desservant un alternateur entraîné par le moteur par lequel le liquide de refroidissement introduit dans l'alternateur est prélevé en sortie du circuit interne du bloc moteur et est refoulé à l'entrée dudit circuit interne.According to the invention, the cooling system is characterized in that it comprises a derivative cooling circuit serving an alternator driven by the engine by which the coolant introduced into the alternator is taken out of the internal circuit of the engine block and is driven back to the input of said internal circuit.

Selon une autre caractéristique du système de refroidissement objet de l'invention, le circuit de refroidissement dérivé comporte un échangeur secondaire liquide/air disposé en amont de l'alternateur.According to another characteristic of the cooling system which is the subject of the invention, the derived cooling circuit comprises a secondary liquid / air exchanger disposed upstream of the alternator.

Selon une autre caractéristique du système de refroidissement objet de l'invention, la circulation à l'intérieur du circuit de refroidissement dérivé est pilotée par un thermostat.According to another characteristic of the system cooling object of the invention, the circulation inside the derived cooling circuit is controlled by a thermostat.

Selon une autre caractéristique du système de refroidissement objet de l'invention, le circuit dérivé de refroidissement de l'alternateur est raccordé d'une part, en amont dans le sens de l'écoulement du liquide de refroidissement, à la canalisation qui relie la sortie du circuit interne du bloc moteur à l'entrée de l'échangeur de chaleur principal, et d'autre part en aval, à la canalisation qui relie la sortie de l'échangeur de chaleur principal à l'entrée du circuit interne du bloc moteur.According to another characteristic of the cooling system which is the subject of the invention, the derivative cooling circuit of the alternator is connected on the one hand, upstream in the direction of the flow of the coolant, to the pipe which connects the outlet of the internal circuit of the engine block at the inlet of the main heat exchanger, and on the other hand downstream, to the pipe which connects the outlet of the main heat exchanger to the inlet of the internal circuit of the block engine.

Selon une autre caractéristique du système de refroidissement objet de l'invention, les caractéristiques structurelles de l'échangeur de chaleur principal et de l'échangeur secondaire sont adaptés en fonction des débits respectifs de liquide de refroidissement qui les traversent.According to another characteristic of the cooling system which is the subject of the invention, the structural characteristics of the main heat exchanger and of the secondary exchanger are adapted as a function of the respective flow rates of coolant which pass through them.

Selon une autre caractéristique du système de refroidissement objet de l'invention, l'échangeur de chaleur principal et l'échangeur secondaire sont disposés en deux endroits distincts du compartiment moteur.According to another characteristic of the cooling system which is the subject of the invention, the main heat exchanger and the secondary exchanger are arranged in two separate places in the engine compartment.

On comprendra mieux les buts, aspects et avantages de la présente invention, d'après la description donnée ci-après d'un mode de réalisation de l'invention appliqués à un moteur à combustion interne, ce mode de réalisation étant donné à titre d'exemple non limitatif, en se référant au dessin annexé, dans lequel :
   - la figure 1 représente schématiquement un système de refroidissement selon l'invention.The objects, aspects and advantages of the present invention will be better understood from the description given below of an embodiment of the invention applied to an internal combustion engine, this embodiment being given by way of nonlimiting example, with reference to the appended drawing, in which:
- Figure 1 schematically shows a cooling system according to the invention.

La figure 1 présente donc un système de refroidissement, repéré par la référence 1 sur le dessin, par liquide (généralement de l'eau additionnée d'un antigel et d'un produit anticorrosion) plus particulièrement destiné au refroidissement d'un moteur à combustion interne 2 par exemple du type multicylindre équipant un véhicule automobile. Seuls les éléments nécessaires à la compréhension de l'invention ont été figurés.FIG. 1 therefore shows a cooling system, identified by the reference 1 in the drawing, by liquid (generally water added with an antifreeze and an anti-corrosion product) more particularly intended for the cooling of a combustion engine internal 2, for example of the multicylinder type fitted to a motor vehicle. Only the elements necessary for understanding the invention have been shown.

Le système de refroidissement par liquide présenté comporte classiquement un circuit interne 12 (encore appelées chambres d'eau) traversant le bloc moteur 2 pour refroidir les chambres de combustion. Le liquide de refroidissement est refroidi par un balayage d'air dans un radiateur constitué par un échangeur de chaleur principal 4 liquide/air. Le liquide est entraîné par une pompe 3 placée immédiatement en amont du circuit interne 12 du moteur 2. La canalisation 10 reliant la sortie du circuit interne 12 à l'échangeur principal 4 comporte un thermostat 5 qui définit un branchement de by-pass 13 desservant un aérotherme 6 pour le chauffage de l'habitat et un vase d'expansion 7. Une canalisation 11 assure le retour du liquide de l'échangeur principal 4 à l'entrée du circuit interne 12.The liquid cooling system presented conventionally comprises an internal circuit 12 (also called water chambers) passing through the engine block 2 to cool the combustion chambers. The coolant is cooled by an air sweep in a radiator constituted by a main liquid / air heat exchanger 4. The liquid is driven by a pump 3 placed immediately upstream of the internal circuit 12 of the engine 2. The pipe 10 connecting the output of the internal circuit 12 to the main exchanger 4 includes a thermostat 5 which defines a bypass connection 13 serving an air heater 6 for heating the home and an expansion tank 7. A pipe 11 ensures the return of the liquid from the main exchanger 4 to the inlet of the internal circuit 12.

Le système de refroidissement comprend de plus un circuit de refroidissement dérivé 14 comportant un échangeur secondaire liquide/air 8 et l'alternateur 9. Suivant la réalisation de l'invention, le liquide de refroidissement introduit dans l'alternateur est prélevé en sortie du circuit interne 12 du moteur 2 et est refoulé à l'entrée de ce dernier.The cooling system includes plus a derivative cooling circuit 14 comprising a secondary liquid / air exchanger 8 and the alternator 9. According to the embodiment of the invention, the cooling liquid introduced into the alternator is taken at the outlet of the internal circuit 12 of the engine 2 and is turned back at the entrance of the latter.

A cet effet, le circuit 14 de refroidissement de l'alternateur 9 est raccordé d'une part, en amont dans le sens de l'écoulement du liquide de refroidissement, à la canalisation 10 qui relie la sortie du circuit interne 12 du bloc moteur 2 à l'entrée de l'échangeur de chaleur principal 4, la connexion pouvant être réalisée avant (Cf figure 1) ou après le thermostat 5, et d'autre part en aval, à la canalisation 11 qui relie la sortie de l'échangeur de chaleur principal 4 à l'entrée du circuit interne 12 du bloc moteur 2.For this purpose, the cooling circuit 14 of the alternator 9 is connected on the one hand, upstream in the direction of the flow of the coolant, to the pipe 10 which connects the outlet of the internal circuit 12 of the engine block 2 at the inlet of the main heat exchanger 4, the connection being able to be made before (cf. FIG. 1) or after the thermostat 5, and on the other hand downstream, to the pipe 11 which connects the outlet of the main heat exchanger 4 at the input of the internal circuit 12 of the engine block 2.

La connexion du circuit dérivé 14 destiné au refroidissement de l'alternateur 9, à la sortie du circuit interne 12 du moteur 2, permet d'accroître sensiblement le débit de liquide à travers l'alternateur 9 quel que soit le point de fonctionnement du moteur, et donc d'améliorer l'élimination des calories en comparaison des systèmes connus dans lesquels le circuit dérivé est alimenté en amont du circuit interne 12 du moteur 2. La température plus élevée du liquide en sortie de moteur 2 est largement atténuée par l'échangeur de température secondaire 8 disposé en amont de l'alternateur 9.The connection of the branch circuit 14 intended for cooling the alternator 9, at the outlet of the internal circuit 12 of the engine 2, makes it possible to significantly increase the flow of liquid through the alternator 9 whatever the operating point of the engine. , and therefore to improve the elimination of calories in comparison with known systems in which the derived circuit is supplied upstream of the internal circuit 12 of the motor 2. The higher temperature of the liquid leaving the motor 2 is largely attenuated by the secondary temperature exchanger 8 disposed upstream of the alternator 9.

Par ailleurs, dans les systèmes de l'art antérieur, la quantité de chaleur supplémentaire transmis au liquide de refroidissement par l'alternateur 9 nécessite d'augmenter la puissance évacuable par l'échangeur principal 4. La solution adoptée conformément à la présente invention d'utiliser un échangeur secondaire 8 disposé dans le circuit dérivé dans lequel ne circule qu'une partie du débit global permet de réduire les surfaces d'échanges nécessaires, de plus cet échangeur secondaire peut être géographiquement dissocié de l'échangeur principal, ce qui permet d'optimiser l'implantation du système de refroidissement dans le compartiment moteur du véhicule automobile. La séparation des échangeurs de chaleur 4 et 8 permet également d'utiliser pour chacun d'eux des solutions techniques offrant des caractéristiques d'échanges thermiques différentes (formes des ailettes, des faisceaux, etc.).Furthermore, in the systems of the prior art, the amount of additional heat transmitted to the coolant by the alternator 9 requires increasing the power which can be removed by the main exchanger 4. The solution adopted in accordance with the present invention d '' using a secondary exchanger 8 disposed in the branch circuit in which only a part of the overall flow circulates makes it possible to reduce the necessary exchange surfaces, moreover this secondary exchanger can be geographically dissociated from the main exchanger, which allows optimize the installation of the cooling system in the engine compartment of the motor vehicle. The separation of the heat exchangers 4 and 8 also makes it possible to use for each of them technical solutions offering different heat exchange characteristics (shapes of the fins, of the bundles, etc.).

Le fonctionnement d'un tel système est le suivant. Quand le moteur est froid, le thermostat 5 est fermé et le liquide ne circule pas dans l'échangeur principal 4 mais seulement dans le circuit dérivé 14 et dans le circuit de by-pass 13 desservant l'aérotherme 6. Quand le moteur s'échauffe le thermostat s'ouvre permettant alors au liquide de circuler tout à la fois dans l'échangeur principal 4, dans l'aérotherme 6, et dans le circuit dérivé 14 desservant l'alternateur 9.The operation of such a system is as follows. When the engine is cold, the thermostat 5 is closed and the liquid does not circulate in the main exchanger 4 but only in the branch circuit 14 and in the by-pass circuit 13 serving the air heater 6. When the engine heats up the thermostat opens, allowing the liquid to circulate at the same time in the main exchanger 4, in the air heater 6, and in the branch circuit 14 serving the alternator 9.

Bien entendu, l'invention n'est nullement limitée au mode de réalisation décrit et illustré qui n'a été donné qu'à titre d'exemple.Of course, the invention is in no way limited to the embodiment described and illustrated, which has been given only by way of example.

Au contraire, l'invention comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci sont effectuées suivant son esprit.On the contrary, the invention includes all the technical equivalents of the means described and their combinations if these are carried out according to the spirit.

Ainsi, il est possible de commander la circulation du liquide de refroidissement dans le circuit dérivé en fonction de la température du liquide en utilisant un thermostat spécifique ou en connectant l'entrée du circuit dérivé à la canalisation de sortie du liquide qui relie le bloc moteur 2 à l'échangeur de chaleur principal 4, ou après le thermostat 5.Thus, it is possible to control the circulation of the coolant in the bypass circuit depending on the temperature of the liquid by using a specific thermostat or by connecting the input of the bypass circuit to the liquid outlet pipe which connects the engine block 2 at the main heat exchanger 4, or after the thermostat 5.

Ainsi, il est possible en lieu et place d'un circuit dérivé spécifique au refroidissement de l'alternateur 9 tel que représenté à la figure 1, de modifier le circuit de by-pass de l'aérotherme pour y inclure les chambres d'eau de l'alternateur 9 et l'échangeur de chaleur secondaire 8 qui sont alors disposés en série avec l'aérotherme 6.Thus, it is possible in place of a derivative circuit specific to the cooling of the alternator 9 as shown in FIG. 1, to modify the bypass circuit of the air heater to include the water chambers of the alternator 9 and the secondary heat exchanger 8 which are then arranged in series with the air heater 6.

Claims (5)

[1] Système de refroidissement par liquide pour moteur à combustion interne (2) équipant un véhicule automobile, comportant un circuit interne (12) traversant le bloc moteur (2), un échangeur de chaleur principal (4) du type liquide/air et une pompe (3) entraînant le liquide, caractérisé en ce qu'il comprend un circuit de refroidissement dérivé (14) desservant un alternateur (9) entraîné par le moteur (2) par lequel le liquide de refroidissement introduit dans l'alternateur (9) est prélevé en sortie du circuit interne (12) du bloc moteur (2) et est refoulé à l'entrée dudit circuit interne (12), ledit circuit de refroidissement dérivé (14) comportant un échangeur secondaire liquide/air (8) disposé en amont de l'alternateur (9). [1] Liquid cooling system for an internal combustion engine (2) fitted to a motor vehicle, comprising an internal circuit (12) passing through the engine block (2), a main heat exchanger (4) of the liquid / air type and a pump (3) driving the liquid, characterized in that it comprises a derivative cooling circuit (14) serving an alternator (9) driven by the engine (2) by which the coolant introduced into the alternator (9 ) is taken from the internal circuit (12) of the engine block (2) and is discharged at the input of said internal circuit (12), said derived cooling circuit (14) comprising a secondary liquid / air exchanger (8) arranged upstream of the alternator (9). [2] Système de refroidissement par liquide selon la revendication 1, caractérisé en ce que la circulation à l'intérieur dudit circuit de refroidissement dérivé (14) est pilotée par un thermostat. [2] Liquid cooling system according to claim 1, characterized in that the circulation inside said derived cooling circuit (14) is controlled by a thermostat. [3] Système de refroidissement par liquide selon l'une quelconque des revendications 1 à 2, caractérisé en ce que ledit circuit dérivé (14) de refroidissement de l'alternateur (9) est raccordé d'une part, en amont dans le sens de l'écoulement du liquide de refroidissement, à la canalisation (10) qui relie la sortie du circuit interne (12) du bloc moteur (2) à l'entrée de l'échangeur de chaleur principal (4), et d'autre part en aval, à la canalisation (11) qui relie la sortie de l'échangeur de chaleur principal (4) à l'entrée du circuit interne (12) du bloc moteur (2). [3] Liquid cooling system according to any one of claims 1 to 2, characterized in that said derivative circuit (14) for cooling the alternator (9) is connected on the one hand, upstream in the direction of the coolant flow, to the pipe (10) which connects the outlet of the internal circuit (12) of the engine block (2) at the inlet of the main heat exchanger (4), and secondly downstream, to the pipe (11) which connects the outlet of the main heat exchanger (4) to the input of the internal circuit (12) of the engine block (2). [4] Système de refroidissement par liquide selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les caractéristiques structurelles de l'échangeur de chaleur principal (4) et de l'échangeur secondaire (8) sont adaptés en fonction des débits respectifs de liquide de refroidissement qui les traversent. [4] Liquid cooling system according to any one of claims 1 to 3, characterized in that the structural characteristics of the main heat exchanger (4) and the secondary exchanger (8) are adapted according to the respective coolant flows through them. [5] Système de refroidissement par liquide selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'échangeur de chaleur principal (4) et l'échangeur secondaire (8) sont disposés en deux endroits distincts du compartiment moteur. [5] Liquid cooling system according to any one of claims 1 to 4, characterized in that the main heat exchanger (4) and the secondary exchanger (8) are arranged in two separate places in the engine compartment.
EP19950400428 1994-03-01 1995-02-28 Cooling system for an internal combustion engine Expired - Lifetime EP0670414B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9402314A FR2716932B1 (en) 1994-03-01 1994-03-01 Cooling system for an internal combustion engine of a motor vehicle.
FR9402314 1994-03-01

Publications (2)

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EP0670414A1 true EP0670414A1 (en) 1995-09-06
EP0670414B1 EP0670414B1 (en) 1998-05-20

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EP19950400428 Expired - Lifetime EP0670414B1 (en) 1994-03-01 1995-02-28 Cooling system for an internal combustion engine

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EP (1) EP0670414B1 (en)
DE (1) DE69502520T2 (en)
FR (1) FR2716932B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2744398A1 (en) * 1996-02-06 1997-08-08 Valeo Equip Electr Moteur Motor vehicle with liquid-cooled alternator to supplement heating
EP0835989A1 (en) * 1996-09-13 1998-04-15 SMH Management Services AG Vehicle with cooling arrangement for an internal combustion engine
GB2322411A (en) * 1997-02-20 1998-08-26 Bosch Gmbh Robert I.c. engine fuel-injection valve with additional supply line eg for water
GB2475079A (en) * 2009-11-05 2011-05-11 Ford Global Tech Llc Vehicle engine cooling system comprising three branches

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Publication number Priority date Publication date Assignee Title
US2188172A (en) * 1937-01-06 1940-01-23 Gen Electric Heat transfer system
DE3044422A1 (en) * 1980-11-26 1982-06-03 Audi Nsu Auto Union Ag, 7107 Neckarsulm MOTOR VEHICLE WITH AN INTERNAL COMBUSTION ENGINE
JPS5875464A (en) * 1981-10-28 1983-05-07 Hino Motors Ltd Cooling device for retarder
US4864974A (en) * 1987-03-23 1989-09-12 Mitsubishi Denki Kabushiki Kaisha Cooling apparatus for a starter motor and/or a generator for a car

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Publication number Priority date Publication date Assignee Title
US2188172A (en) * 1937-01-06 1940-01-23 Gen Electric Heat transfer system
DE3044422A1 (en) * 1980-11-26 1982-06-03 Audi Nsu Auto Union Ag, 7107 Neckarsulm MOTOR VEHICLE WITH AN INTERNAL COMBUSTION ENGINE
JPS5875464A (en) * 1981-10-28 1983-05-07 Hino Motors Ltd Cooling device for retarder
US4864974A (en) * 1987-03-23 1989-09-12 Mitsubishi Denki Kabushiki Kaisha Cooling apparatus for a starter motor and/or a generator for a car

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Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 170 (E - 189) 27 July 1983 (1983-07-27) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2744398A1 (en) * 1996-02-06 1997-08-08 Valeo Equip Electr Moteur Motor vehicle with liquid-cooled alternator to supplement heating
EP0835989A1 (en) * 1996-09-13 1998-04-15 SMH Management Services AG Vehicle with cooling arrangement for an internal combustion engine
GB2322411A (en) * 1997-02-20 1998-08-26 Bosch Gmbh Robert I.c. engine fuel-injection valve with additional supply line eg for water
GB2322411B (en) * 1997-02-20 1999-03-17 Bosch Gmbh Robert Fuel-injection valve for internal combustion engines
GB2475079A (en) * 2009-11-05 2011-05-11 Ford Global Tech Llc Vehicle engine cooling system comprising three branches
US8291870B2 (en) 2009-11-05 2012-10-23 Ford Global Technologies, Llc Cooling systems
US8408165B2 (en) 2009-11-05 2013-04-02 Ford Global Technologies, Llc Cooling systems
GB2475079B (en) * 2009-11-05 2015-02-18 Ford Global Tech Llc Cooling systems

Also Published As

Publication number Publication date
DE69502520T2 (en) 1999-01-28
DE69502520D1 (en) 1998-06-25
FR2716932B1 (en) 1996-03-29
EP0670414B1 (en) 1998-05-20
FR2716932A1 (en) 1995-09-08

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