EP0470905B1 - Control casing for the cooling of an automobile engine - Google Patents

Control casing for the cooling of an automobile engine Download PDF

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Publication number
EP0470905B1
EP0470905B1 EP91402193A EP91402193A EP0470905B1 EP 0470905 B1 EP0470905 B1 EP 0470905B1 EP 91402193 A EP91402193 A EP 91402193A EP 91402193 A EP91402193 A EP 91402193A EP 0470905 B1 EP0470905 B1 EP 0470905B1
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EP
European Patent Office
Prior art keywords
heat exchanger
wall
motor
fluid
control box
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.)
Expired - Lifetime
Application number
EP91402193A
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German (de)
French (fr)
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EP0470905A1 (en
Inventor
Hervé Couetoux
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.)
Valeo Thermique Moteur SA
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Valeo Thermique Moteur SA
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Publication of EP0470905A1 publication Critical patent/EP0470905A1/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
    • F01P11/14—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
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/08—Controlling of coolant flow the coolant being cooling-air by cutting in or out of pumps

Definitions

  • the invention relates to a device for cooling a heat engine, in particular a motor vehicle, comprising a heat exchanger for the air cooling of a cooling fluid circulating in thermal contact with the engine, a motor-fan unit suitable for force the circulation of air in contact with the heat exchanger, and a temperature sensor in thermal contact with the coolant, inside the heat exchanger, to control the operation of the motor-fan unit depending on the temperature of the fluid.
  • the motor-fan unit serves to intensify the cooling of the cooling fluid, for example an aqueous solution of an antifreeze liquid, to prevent its temperature from becoming too high.
  • the fan is started by means of switching members when the temperature sensor detects the crossing of a threshold by the temperature of the fluid.
  • the simplest devices include a single fan driven by a single motor supplied with a single voltage. The system can then take two states, fan stopped or fan on, depending on whether the detected temperature is lower or higher than the switching threshold. More elaborate devices include a motor that can be powered directly, or through a ballast resistor, so as to rotate at two different speeds, or a four-brush motor designed to rotate at two different speeds, or two motors each driving a fan. and can be supplied in series or in parallel. These devices have three operating modes depending on the temperature of the coolant. Some devices include, in addition, an electronic variator to continuously vary the speed of the fan motor.
  • the switching members for example relays or electronic components, which ensure the putting on or off of the motor-fan unit, and if necessary the variation of its speed, under the control of the temperature detector, are away from it and the fan motor.
  • the ballast resistor when provided, this ballast resistor being placed in the cooling air stream of the heat exchanger, for its own cooling. This dispersion complicates the assembly and wiring of the device.
  • the temperature sensor is arranged projecting from a closed control unit mounted on an external wall of the heat exchanger, while being in thermal contact with the cooling fluid, inside the heat exchanger for controlling the operation of the motor-fan unit as a function of the temperature, this wall comprising an opening closed by the housing which is limited, towards the interior of the exchanger, by a heat conducting wall, the control unit containing the elements necessary for the switching of the motor-fan unit and being connected directly, by electrical conductors, to an electrical power source and to the power input terminals motor of this group as well as a resistor which can be connected in series with said motor, by means of said switching members, to ensure a speed of ro reduced tation, the ballast resistance being in contact with the coolant.
  • This device has the significant disadvantage that the resistance, which is located near the sensor, has a direct effect on the latter. In fact, in operation, the heat generated by the resistor is transmitted to the sensor, which induces an error in detecting the temperature of the fluid.
  • the object of the invention is to remedy this drawback.
  • the device comprising a heat exchanger for the air cooling of a cooling fluid circulating in thermal contact with the engine, a motor-fan unit capable of forcing the circulation of air in contact with the heat exchanger, and a temperature sensor projecting from a closed control unit mounted on an outer wall of the heat exchanger, while being in thermal contact with the coolant, inside the heat exchanger, to control the operation of the motor-fan unit as a function of the temperature of the fluid, this external wall of the exchanger comprising an opening which is closed in a sealed manner against the coolant by the control unit, the latter being limited, towards the inside of the heat exchanger, by a heat conducting wall, said housing containing the components necessary for switching of the motor-driven fan unit and being connected directly, by electrical conductors, to a source of electrical power and to the power input terminals of the motor of this group as well as a ballast resistor which can be connected in series with the motor of the motor-fan unit, by means of said switching members, to ensure a reduced speed of rotation,
  • said outer wall belongs to a fluid box defining at least one fluid chamber into which the temperature sensor penetrates.
  • the opening of the outer wall and the tubular and annular parts of the wall of the control unit have forms of substantially revolution around the same axis.
  • the heat exchanger 1 comprises a fluid box 2 defining at least one chamber 3 filled with a cooling fluid, for example an aqueous solution of an antifreeze product, and a bundle of tubes provided with 'fins 4, at least part of the tubes being in communication with the chamber 3.
  • a cooling fluid for example an aqueous solution of an antifreeze product
  • An outer wall 5 of the fluid box 2, limiting the chamber 3, has a circular opening 6, which is closed by a control unit 7, with the interposition of an annular seal 8.
  • the housing 7 is formed by a sole 9 made of a metal which is a good conductor of heat, for example aluminum, applied to the wall 5 and closing off the opening 6, and a plastic cover 10, located outside of the fluid box 2 and cooperating with the sole 9 to define a closed space 11.
  • the sole 9 has a tubular part 12, projecting inside the chamber 3 and closed at its free end, as well as an annular part 13 surrounding the part 12.
  • This annular part is formed by an internal cylindrical wall element 14 and d an external cylindrical wall element 15 interconnected by an end wall element 16 so as to delimit an annular space 17 separated from the chamber 3 and communicating with the space 11.
  • the tubular part 12 and the annular part 13 have forms of revolution around the axis of opening 6.
  • the tubular part 12 and the annular part 13 respectively contain a temperature sensor 18, for example a thermistor, and a ballast resistor 19 which are in thermal contact, via the wall of the sole 9, with the cooling fluid. contained in chamber 3, which bathes this wall.
  • the internal space 11 of the control unit 7 contains a printed circuit 20 connected to the sensor 18 and to the resistor 19, and carrying switching members such as relays 21 and electronic components 22.
  • the printed circuit 20 is also connected by conductors 23 located in the space 11 to electrical connection terminals 24 mounted on the cover 10 and projecting outside the housing.
  • terminals are intended to be connected directly, by electrical conductors, on the one hand to a power source, for example the storage battery and / or the vehicle alternator, on the other hand to the input terminals the power of the motor of a motor-fan unit, so that the motor, depending on the state of the switching members, themselves controlled by the temperature sensor 18, is supplied practically under the voltage of the source, or under reduced voltage, by being connected in series with the ballast resistor 19, or either off.
  • a power source for example the storage battery and / or the vehicle alternator
  • the annular part 13 of the sole 9 is spaced radially from the axial tubular part 12, leaving between them an annular space 25 filled with cooling fluid, which allows the heat given off by the resistor 19 not to have a significant influence on the temperature detected by the sensor 18, while allowing this heat to be removed by the fluid circulating in the annular space.
  • Means not shown may be provided to ensure rapid mounting of the control unit on the fluid box 2, for example of the bayonet type.
  • Additional connection terminals can be provided on the housing when information other than the coolant temperature, for example from an on-board computer, must be taken into account when controlling the motor-fan unit.
  • annular part of the sole of the control unit can be eliminated when the device does not include a ballast resistance.

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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 Or The Like Of Electrical Apparatus (AREA)

Description

L'invention concerne un dispositif de refroidissement d'un moteur thermique, notamment de véhicule automobile, comprenant un échangeur de chaleur pour le refroidissement par air d'un fluide de refroidissement circulant en contact thermique avec le moteur, un groupe moto-ventilateur propre à forcer la circulation de l'air en contact avec l'échangeur de chaleur, et un capteur de température en contact thermique avec le fluide de refroidissement, à l'intérieur de l'échangeur de chaleur, pour commander le fonctionnement du groupe moto-ventilateur en fonction de la température du fluide.The invention relates to a device for cooling a heat engine, in particular a motor vehicle, comprising a heat exchanger for the air cooling of a cooling fluid circulating in thermal contact with the engine, a motor-fan unit suitable for force the circulation of air in contact with the heat exchanger, and a temperature sensor in thermal contact with the coolant, inside the heat exchanger, to control the operation of the motor-fan unit depending on the temperature of the fluid.

Dans un tel dispositif, le groupe moto-ventilateur sert à intensifier le refroidissement du fluide de refroidissement, par exemple une solution aqueuse d'un liquide antigel, pour éviter que sa température devienne trop élevée. A cet effet, le ventilateur est mis en marche au moyen d'organes de commutation lorsque le capteur de température détecte le franchissement d'un seuil par la température du fluide. Les dispositifs les plus simples comprennent un seul ventilateur entraîné par un seul moteur alimenté sous une seule tension. Le système peut alors prendre deux états, ventilateur arrêté ou ventilateur en marche, selon que la température détectée est inférieure ou supérieure au seuil de commutation. Des dispositifs plus élaborés comprennent un moteur pouvant être alimenté directement, ou à travers une résistance ballast, de façon à tourner à deux vitesses différentes, ou un moteur à quatre balais conçu pour tourner à deux vitesses différentes, ou encore deux moteurs entraînant chacun un ventilateur et pouvant être alimentés en série ou en parallèle. Ces dispositifs présentent trois modes de fonctionnement en fonction de la température du fluide de refroidissement. Certains dispositifs comportent, par ailleurs, un variateur électronique pour faire varier de façon continue la vitesse du moteur du ventilateur.In such a device, the motor-fan unit serves to intensify the cooling of the cooling fluid, for example an aqueous solution of an antifreeze liquid, to prevent its temperature from becoming too high. To this end, the fan is started by means of switching members when the temperature sensor detects the crossing of a threshold by the temperature of the fluid. The simplest devices include a single fan driven by a single motor supplied with a single voltage. The system can then take two states, fan stopped or fan on, depending on whether the detected temperature is lower or higher than the switching threshold. More elaborate devices include a motor that can be powered directly, or through a ballast resistor, so as to rotate at two different speeds, or a four-brush motor designed to rotate at two different speeds, or two motors each driving a fan. and can be supplied in series or in parallel. These devices have three operating modes depending on the temperature of the coolant. Some devices include, in addition, an electronic variator to continuously vary the speed of the fan motor.

Dans les dispositifs connus, les organes de commutation, par exemple relais ou composants électroniques, qui assurent la mise en ou hors service du groupe moto-ventilateur, et le cas échéant la variation de sa vitesse, sous la commande du détecteur de température, sont éloignés de celui-ci et du moteur du ventilateur. Il en est de même de la résistance ballast, lorqu'elle est prévue, cette résistance ballast étant placée dans le courant d'air de refroidissement de l'échangeur de chaleur, pour son propre refroidissement. Cette dispersion complique le montage et le câblage du dispositif.In known devices, the switching members, for example relays or electronic components, which ensure the putting on or off of the motor-fan unit, and if necessary the variation of its speed, under the control of the temperature detector, are away from it and the fan motor. The same applies to the ballast resistor, when provided, this ballast resistor being placed in the cooling air stream of the heat exchanger, for its own cooling. This dispersion complicates the assembly and wiring of the device.

Dans le document GB-A-981 907, il est décrit un autre dispositif selon lequel le capteur de température est disposé en saillie sur un boîtier de commande fermé monté sur une paroi extérieure de l'échangeur de chaleur, en étant en contact thermique avec le fluide de refroidissement, à l'intérieur de l'échangeur de chaleur pour commander le fonctionnement du groupe moto-ventilateur en fonction de la température, cette paroi comportant une ouverture obturée par le boîtier qui est limitée, vers l'intérieur de l'échangeur, par une paroi conductrice de chaleur, le boîtier de commande contenant les organes nécessaires à la commutation du groupe moto-ventilateur et étant reliés directement, par des conducteurs électriques, à une source d'alimentation électrique et aux bornes d'entrée de puissance du moteur de ce groupe ainsi qu'une résistance qui peut être branchée en série avec ledit moteur, au moyen desdits organes de commutation, pour assurer une vitesse de rotation réduite, la résistance ballast étant en contact avec le fluide de refroidissement.In document GB-A-981 907, another device is described according to which the temperature sensor is arranged projecting from a closed control unit mounted on an external wall of the heat exchanger, while being in thermal contact with the cooling fluid, inside the heat exchanger for controlling the operation of the motor-fan unit as a function of the temperature, this wall comprising an opening closed by the housing which is limited, towards the interior of the exchanger, by a heat conducting wall, the control unit containing the elements necessary for the switching of the motor-fan unit and being connected directly, by electrical conductors, to an electrical power source and to the power input terminals motor of this group as well as a resistor which can be connected in series with said motor, by means of said switching members, to ensure a speed of ro reduced tation, the ballast resistance being in contact with the coolant.

Ce dispositif présente l'inconvénient non négligeable selon lequel la résistance, qui est logée à proximité du capteur, a un effet direct sur ce dernier. En effet, en fonctionnement, la chaleur générée par la résistance est transmise au capteur ce qui induit une erreur de détection de la température du fluide.This device has the significant disadvantage that the resistance, which is located near the sensor, has a direct effect on the latter. In fact, in operation, the heat generated by the resistor is transmitted to the sensor, which induces an error in detecting the temperature of the fluid.

Le but de l'invention est de remédier à cet inconvénient.The object of the invention is to remedy this drawback.

A cet effet, le dispositif selon l'invention, comprenant un échangeur de chaleur pour le refroidissement par air d'un fluide de refroidissement circulant en contact thermique avec le moteur, un groupe moto-ventilateur propre à forcer la circulation de l'air en contact avec l'échangeur de chaleur, et un capteur de température disposé en saillie sur un boîtier de commande fermé monté sur une paroi extérieure de l'échangeur de chaleur, en étant en contact thermique avec le fluide de refroidissement, à l'intérieur de l'échangeur de chaleur, pour commander le fonctionnement du groupe moto-ventilateur en fonction de la température du fluide, cette paroi extérieure de l'échangeur comportant une ouverture qui est obturée de façon étanche au fluide de refroidissement par le boîtier de commande, ce dernier étant limité, vers l'intérieur de l'échangeur de chaleur, par une paroi conductrice de la chaleur, ledit boîtier contenant les organes nécessaires à la commutation du groupe moto-ventilateur et étant relié directement, par des conducteurs électriques, à une source d'alimentation électrique et aux bornes d'entrée de puissance du moteur de ce groupe ainsi qu'une résistance ballast qui peut être branchée en série avec le moteur du groupe moto-ventilateur, au moyen desdits organes de commutation, pour assurer une vitesse de rotation réduite, la résistance ballast étant en contact thermique avec le fluide de refroidissement, est caractérisé en ce que la paroi présente une partie tubulaire en saillie pour loger le capteur de température et une partie annulaire en saillie, entourant la partie tubulaire, pour loger la résistance ballast, la partie tubulaire et la partie annulaire étant séparées l'une de l'autre par un espace libre annulaire rempli par le fluide de refroidissement.To this end, the device according to the invention, comprising a heat exchanger for the air cooling of a cooling fluid circulating in thermal contact with the engine, a motor-fan unit capable of forcing the circulation of air in contact with the heat exchanger, and a temperature sensor projecting from a closed control unit mounted on an outer wall of the heat exchanger, while being in thermal contact with the coolant, inside the heat exchanger, to control the operation of the motor-fan unit as a function of the temperature of the fluid, this external wall of the exchanger comprising an opening which is closed in a sealed manner against the coolant by the control unit, the latter being limited, towards the inside of the heat exchanger, by a heat conducting wall, said housing containing the components necessary for switching of the motor-driven fan unit and being connected directly, by electrical conductors, to a source of electrical power and to the power input terminals of the motor of this group as well as a ballast resistor which can be connected in series with the motor of the motor-fan unit, by means of said switching members, to ensure a reduced speed of rotation, the ballast resistance being in thermal contact with the cooling fluid, is characterized in that the wall has a projecting tubular part for housing the temperature sensor and a projecting annular part, surrounding the tubular part, for housing the ballast resistance, the tubular part and the annular part being separated from each other by a space free ring filled with coolant.

Dans un mode de réalisation de l'invention, ladite parois extérieure appartient à une boîte à fluide définissant au moins une chambre de fluide dans laquelle pénètre le capteur de température.In one embodiment of the invention, said outer wall belongs to a fluid box defining at least one fluid chamber into which the temperature sensor penetrates.

Avantageusement, l'ouverture de la paroi extérieure et les parties tubulaire et annulaire de la paroi du boîtier de commande ont des formes sensiblement de révolution autour d'un même axe.Advantageously, the opening of the outer wall and the tubular and annular parts of the wall of the control unit have forms of substantially revolution around the same axis.

D'autres avantages de l'invention ressortiront de la description détaillée ci-après, et de la figure unique annexée, représentant une partie d'un échangeur de chaleur selon l'invention, en élévation et partiellement en coupe.Other advantages of the invention will emerge from the detailed description below, and from the appended single figure, showing part of a heat exchanger according to the invention, in elevation and partially in section.

L'échangeur de chaleur 1, partiellement représenté, comprend une boîte à fluide 2 définissant au moins une chambre 3 remplie d'un fluide de refroidissement, par exemple d'une solution aqueuse d'un produit antigel, et un faisceau de tubes muni d'ailettes 4, une partie au moins des tubes étant en communication avec la chambre 3. Une paroi extérieure 5 de la boîte à fluide 2, limitant la chambre 3, présente une ouverture circulaire 6, qui est obturée par un boîtier de commande 7, avec interposition d'un joint d'étanchéité annulaire 8. Le boîtier 7 est formé d'une semelle 9 en métal bon conducteur de la chaleur, par exemple en aluminium, appliquée sur la paroi 5 et obturant l'ouverture 6, et d'un capot en matière plastique 10, situé à l'extérieur de la boîte à fluide 2 et coopérant avec la semelle 9 pour définir un espace fermé 11. La semelle 9 présente une partie tubulaire 12, en saillie à l'intérieur de la chambre 3 et fermée à son extrémité libre, ainsi qu'une partie annulaire 13 entourant la partie 12. Cette partie annulaire est formée d'un élément de paroi cylindrique interne 14 et d'un élément de paroi cylindrique externe 15 reliés entre eux par un élément de paroi d'extrémité 16 de façon à délimiter un espace annulaire 17 séparé de la chambre 3 et communiquant avec l'espace 11. La partie tubulaire 12 et la partie annulaire 13 ont des formes de révolution autour de l'axe de l'ouverture 6.The heat exchanger 1, partially shown, comprises a fluid box 2 defining at least one chamber 3 filled with a cooling fluid, for example an aqueous solution of an antifreeze product, and a bundle of tubes provided with 'fins 4, at least part of the tubes being in communication with the chamber 3. An outer wall 5 of the fluid box 2, limiting the chamber 3, has a circular opening 6, which is closed by a control unit 7, with the interposition of an annular seal 8. The housing 7 is formed by a sole 9 made of a metal which is a good conductor of heat, for example aluminum, applied to the wall 5 and closing off the opening 6, and a plastic cover 10, located outside of the fluid box 2 and cooperating with the sole 9 to define a closed space 11. The sole 9 has a tubular part 12, projecting inside the chamber 3 and closed at its free end, as well as an annular part 13 surrounding the part 12. This annular part is formed by an internal cylindrical wall element 14 and d an external cylindrical wall element 15 interconnected by an end wall element 16 so as to delimit an annular space 17 separated from the chamber 3 and communicating with the space 11. The tubular part 12 and the annular part 13 have forms of revolution around the axis of opening 6.

La partie tubulaire 12 et la partie annulaire 13 contiennent respectivement un capteur de température 18, par exemple une thermistance, et une résistance ballast 19 qui sont en contact thermique, par l'intermédiaire de la paroi de la semelle 9, avec le fluide de refroidissement contenu dans la chambre 3, qui baigne cette paroi. L'espace interne 11 du boîtier de commande 7 contient un circuit imprimé 20 relié au capteur 18 et à la résistance 19, et portant des organes de commutation tels que des relais 21 et des composants électroniques 22. Le circuit imprimé 20 est également relié par des conducteurs 23 situés dans l'espace 11 à des bornes de raccordement électrique 24 montées sur le capot 10 et faisant saillie à l'extérieur du boîtier. Ces bornes sont destinées à être raccordées directement, par des conducteurs électriques, d'une part à une source d'alimentation, par exemple la batterie d'accumulateurs et/ou l'alternateur du véhicule, d'autre part aux bornes d'entrée de puissance du moteur d'un groupe moto-ventilateur, de façon que le moteur, en fonction de l'état des organes de commutation, eux-mêmes pilotés par le capteur de température 18, soit alimenté pratiquement sous la tension de la source, ou sous une tension réduite, en étant branché en série avec la résistance ballast 19, ou soit hors circuit.The tubular part 12 and the annular part 13 respectively contain a temperature sensor 18, for example a thermistor, and a ballast resistor 19 which are in thermal contact, via the wall of the sole 9, with the cooling fluid. contained in chamber 3, which bathes this wall. The internal space 11 of the control unit 7 contains a printed circuit 20 connected to the sensor 18 and to the resistor 19, and carrying switching members such as relays 21 and electronic components 22. The printed circuit 20 is also connected by conductors 23 located in the space 11 to electrical connection terminals 24 mounted on the cover 10 and projecting outside the housing. These terminals are intended to be connected directly, by electrical conductors, on the one hand to a power source, for example the storage battery and / or the vehicle alternator, on the other hand to the input terminals the power of the motor of a motor-fan unit, so that the motor, depending on the state of the switching members, themselves controlled by the temperature sensor 18, is supplied practically under the voltage of the source, or under reduced voltage, by being connected in series with the ballast resistor 19, or either off.

La partie annulaire 13 de la semelle 9 est écartée radialement de la partie tubulaire axiale 12, laissant entre elles un espace annulaire 25 rempli de fluide de refroidissement, qui permet à la chaleur dégagée par la résistance 19 de ne pas influencer de façon sensible la température détectée par le capteur 18, tout en permettant d'évacuer cette chaleur par le fluide circulant dans l'espace annulaire.The annular part 13 of the sole 9 is spaced radially from the axial tubular part 12, leaving between them an annular space 25 filled with cooling fluid, which allows the heat given off by the resistor 19 not to have a significant influence on the temperature detected by the sensor 18, while allowing this heat to be removed by the fluid circulating in the annular space.

Des moyens non représentés peuvent être prévus pour assurer un montage rapide du boîtier de commande sur la boîte à fluide 2, par exemple du type à baïonnette.Means not shown may be provided to ensure rapid mounting of the control unit on the fluid box 2, for example of the bayonet type.

Des bornes de raccordement supplémentaires peuvent être prévues sur le boîtier lorsque des informations autres que la température du fluide de refroidissement, provenant par exemple d'un ordinateur de bord, doivent être prises en compte pour la commande du groupe moto-ventilateur.Additional connection terminals can be provided on the housing when information other than the coolant temperature, for example from an on-board computer, must be taken into account when controlling the motor-fan unit.

Bien entendu, la partie annulaire de la semelle du boîtier de commande peut être supprimée lorsque le dispositif ne comporte pas de résistance ballast.Of course, the annular part of the sole of the control unit can be eliminated when the device does not include a ballast resistance.

Claims (4)

  1. Apparatus for cooling a heat engine, especially for a motor vehicle, comprising a heat exchanger (1) for the air cooling of a coolant fluid flowing in thermal contact with the engine, a motorised fan unit for inducing forced circulation of the air in contact with the heat exchanger, and a temperature sensor (18) projecting from a closed control box mounted on an outer wall (5) of the heat exchanger, being in thermal contact with the coolant fluid within the heat exchanger so as to control the operation of the motorised fan unit according to the temperature of the fluid, the said outer wall (5) of the heat exchanger having an aperture (6) which is obturated, sealingly against the coolant fluid, by the control box (7), the latter being bounded towards the interior of the heat exchanger by a thermally conductive wall (9), the said control box containing the devices (21, 22) which are necessary for the switching of the motorised fan unit and being connected directly, through electrical conductors, to an electrical power source and to the power input terminals of the motor of the said unit, together with a ballast resistor (19) which may be connected in series with the motor of the motorised fan unit via the said switching devices, so as to produce a reduced speed of rotation, the ballast resistor being in thermal contact with the coolant fluid, characterised in that the wall (9) has a projecting tubular portion for accommodating the temperature sensor, and a projecting annular portion surrounding the tubular portion for accommodating the ballast resistor, the tubular portion and the annular portion being separated from each other by a free annular space (25) which is filled with the coolant fluid.
  2. Apparatus according to Claim 1, characterised in that the outer wall (5) of the heat exchanger is part of a fluid header (2) which defines at least one fluid chamber (3), into which the temperature sensor penetrates.
  3. Apparatus according to Claim 1, characterised in that the aperture in the outer wall (5) of the heat exchanger, and the tubular and annular portions of the wall of the control box, are shaped substantially as bodies of revolution about a common axis.
  4. Apparatus according to one of the preceding Claims, characterised in that the switching devices are mounted on a printed circuit (20) which is disposed inside the control box.
EP91402193A 1990-08-08 1991-08-06 Control casing for the cooling of an automobile engine Expired - Lifetime EP0470905B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9010148A FR2665727B1 (en) 1990-08-08 1990-08-08 COOLING DEVICE FOR A HEAT ENGINE, CONTROL UNIT FORMING PART OF THIS DEVICE, HEAT EXCHANGER AND FLUID BOX FOR HEAT EXCHANGER EQUIPPED WITH THIS CONTROL UNIT.
FR9010148 1990-08-08

Publications (2)

Publication Number Publication Date
EP0470905A1 EP0470905A1 (en) 1992-02-12
EP0470905B1 true EP0470905B1 (en) 1995-07-19

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Application Number Title Priority Date Filing Date
EP91402193A Expired - Lifetime EP0470905B1 (en) 1990-08-08 1991-08-06 Control casing for the cooling of an automobile engine

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US (1) US5174248A (en)
EP (1) EP0470905B1 (en)
DE (1) DE69111330T2 (en)
ES (1) ES2075943T3 (en)
FR (1) FR2665727B1 (en)

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US5359969A (en) * 1994-01-05 1994-11-01 Caterpillar Inc. Intermittent cooling fan control
US5623400A (en) * 1995-04-28 1997-04-22 Chiang; Chao-Cheng Control system for smoke exhauster
FR2734348B1 (en) * 1995-05-18 1997-07-04 Valeo Thermique Moteur Sa HEAT EXCHANGER PROVIDED WITH A TEMPERATURE SENSOR FOR A MOTOR VEHICLE
US20080036567A1 (en) * 2006-08-08 2008-02-14 Steven Glassburn Method of controlling an operating temperature of existing vehicle engine cooling fan on and off cycles
DE102006041890B4 (en) * 2006-09-06 2013-05-02 Bayerische Motoren Werke Aktiengesellschaft Sensor receiving device and motor vehicle
DE102006054035A1 (en) * 2006-11-16 2008-05-21 Behr Gmbh & Co. Kg cooler
DE102006059859A1 (en) * 2006-12-15 2008-06-19 Behr Gmbh & Co. Kg Electric module e.g. for coolant cooler of motor vehicle, has heat transference connection formed between electric module and heat-transfer device
DE102007023407A1 (en) * 2007-05-18 2008-11-20 GM Global Technology Operations, Inc., Detroit Motor vehicle with linearly controlled engine fan
DE102007044385A1 (en) * 2007-09-17 2009-04-02 Sitronic Gesellschaft für elektrotechnische Ausrüstung mbH. & Co. KG Coolant circuit for controlling the temperature of a coolant and motor vehicle so
JP7239264B2 (en) * 2017-12-04 2023-03-14 矢崎総業株式会社 Circuit body for vehicle

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Also Published As

Publication number Publication date
DE69111330T2 (en) 1996-01-04
FR2665727B1 (en) 1994-07-08
EP0470905A1 (en) 1992-02-12
ES2075943T3 (en) 1995-10-16
US5174248A (en) 1992-12-29
FR2665727A1 (en) 1992-02-14
DE69111330D1 (en) 1995-08-24

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