EP1362169A1 - Device and method for cooling a heat engine control element - Google Patents

Device and method for cooling a heat engine control element

Info

Publication number
EP1362169A1
EP1362169A1 EP02704825A EP02704825A EP1362169A1 EP 1362169 A1 EP1362169 A1 EP 1362169A1 EP 02704825 A EP02704825 A EP 02704825A EP 02704825 A EP02704825 A EP 02704825A EP 1362169 A1 EP1362169 A1 EP 1362169A1
Authority
EP
European Patent Office
Prior art keywords
cooling
engine
radiator
valve
exchanger
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
EP02704825A
Other languages
German (de)
French (fr)
Other versions
EP1362169B1 (en
Inventor
Olivier Hibon
René Pannier
Denis Reverseau
Régis GOSSUIN
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
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 filed Critical Renault SAS
Publication of EP1362169A1 publication Critical patent/EP1362169A1/en
Application granted granted Critical
Publication of EP1362169B1 publication Critical patent/EP1362169B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • 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
    • F01P2007/143—Controlling of coolant flow the coolant being liquid using restrictions
    • 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
    • F01P2050/00—Applications
    • F01P2050/30—Circuit boards
    • 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

Definitions

  • the present invention relates to a cooling device for a control member of a thermal engine of a motor vehicle, as well as to a method for permanently supplying coolant to a heat exchanger intended to cool such a member. control.
  • the drive motor of motor vehicles can be cooled by circulating a coolant, in practice water, which passes through the main parts of the engine which should be cooled.
  • the cooling circuit essentially includes a circulation pump driven by the engine and a radiator consisting of a water / air heat exchanger capable of cooling the water circulated by the pump.
  • a thermostatic valve is also generally provided, so as to isolate the part of the main cooling circuit which contains the radiator, for the duration of the cold start where excessive cooling of the engine is not desired. The thermostatic valve opens gradually as a function of the temperature of the circulating water, heated by the engine after the start-up period.
  • Cooling can for example be obtained by circulating the cooling water flowing in the main engine cooling circuit.
  • the addition, without special precautions, of a heat exchanger in the main engine cooling circuit however has the disadvantage that the cooling is not done properly in a constant manner during the engine starting phases when the thermostatic valve is closed and during normal operating phases where the thermostatic valve is open.
  • Another solution consisting in using an independent cooling circuit also requires an additional electric water pump and at least one solenoid valve, which complicates the overall structure and increases the cost as well as the risk of breakdowns.
  • the object of the present invention is to eliminate these difficulties and to ensure the cooling of a control member of a combustion engine of a motor vehicle, for example of the valve control system, which allows constant and permanent cooling whatever or the state of the thermostatic valve.
  • the object of the invention is also to continuously supply a heat exchanger with coolant from the main engine cooling circuit, regardless of the position of the thermostatic valve.
  • the cooling device of the invention is intended to cooperate with a control member of a combustion engine of a motor vehicle.
  • the device comprises a main circuit for the flow of a coolant passing through the engine and including a circulation pump, a thermostatic valve and a radiator.
  • a heat exchanger capable of cooling the control member is mounted in a secondary circuit, downstream of the radiator, between said radiator and the circulation pump.
  • a restriction is mounted in the main circuit in parallel with the exchanger. In this way, a branch of the secondary circuit connecting the exchanger to the restriction is crossed by the coolant in one direction or the other depending on whether the thermostatic valve is open or closed.
  • the exchanger is supplied with coolant at a lower temperature when the thermostatic valve is open, which is the most common case.
  • an aerothermal exchanger intended for heating the passenger compartment of the vehicle is also mounted in the main circuit downstream of the thermostatic valve, with its return pipe connected upstream of the restriction.
  • control member is designed to act on the valves of the engine.
  • the invention also relates, more generally, to a method for permanently supplying coolant to a heat exchanger mounted in a secondary circuit bypassing a main flow circuit, a part of which can be isolated by a closing valve.
  • a closing valve a method for permanently supplying coolant to a heat exchanger mounted in a secondary circuit bypassing a main flow circuit, a part of which can be isolated by a closing valve.
  • an inversion of the direction of flow in a branch of the secondary circuit is automatically operated as a function of the position of the closing valve, by means of a pressure drop generated in a portion of the main circuit.
  • the valve closes when the temperature of the coolant reaches a determined value.
  • the method of the invention is particularly advantageous when the heat exchanger is used to cool a valve control member of a heat engine, in particular in a motor vehicle.
  • FIG. 1 schematically shows a cooling device according to the invention
  • FIG. 2 illustrates the circulation of the coolant in the device illustrated in Figure 1, when the thermostatic valve is closed;
  • FIG. 3 schematically illustrates the circulation of the coolant in the device illustrated in Figure 1, when the thermostatic valve is open. 5
  • the cooling device of the invention is used in association with a heat engine shown diagrammatically by the dashed frame 1.
  • the heat engine 1 is cooled by a circulation d water flowing in a main flow circuit 2 which includes a circulation pump 3, a
  • the circuit 2 can be more or less filled with cooling water thanks to the existence of a filling jar 6 playing the role of a vase of expansion and mounted in diversion by conduits 7 and 8 on the air / water heat exchanger which constitutes the radiator 5.
  • a filling jar 6 playing the role of a vase of expansion and mounted in diversion by conduits 7 and 8 on the air / water heat exchanger which constitutes the radiator 5.
  • the cooling water conveyed by the line 9 passes through the thermostatic valve 4, the opening and closing of which are controlled by an expansion element 4a on which the temperature of the water passing through the thermostatic valve 4 acts.
  • the passenger compartment of the vehicle In the example illustrated in FIG. 1, the passenger compartment of the vehicle
  • a heating device including an air heater 10 in the form of an air / water heat exchanger which is supplied by the cooling water of the main circuit 2 coming directly from the thermostatic valve 4 by line 11.
  • the outlet of the air heater 10 is connected via line 11 a to a
  • the heat exchanger 14 receives cooling water by
  • FIG. 1 The operation of the device illustrated in FIG. 1 is as follows, with reference to FIGS. 2 and 3.
  • FIG. 3 illustrates the different flows in the device of the invention when the thermostatic valve 4 is completely open. In this case, all of the cooling water coming from the air heater 10 through line 1a is directed by branch 15 through restriction 16 to return via line 22 to the circulation pump 3.
  • the thermostatic valve 4 being open, the cooling water also flows in line 26, passes through the radiator 5 and returns via line 27 to point 19 where the flow separates into two parts.
  • the first part passes through the heat exchanger 14 via the secondary circuit 13 before returning to the circulation pump 3 via the pipe.
  • the second part flows through the branch 17, crosses the restriction 16 before returning via the line 22 to the circulation pump 3.
  • the circulation of water in branch 17 has therefore been reversed compared to that which existed when the thermostatic valve 4 was closed, as illustrated in FIG. 2.
  • the flow rate in the radiator 5 is here maximum, as in the exchanger heat 14.
  • the exchanger 14 is traversed by water which has been cooled by the radiator 5, which improves the cooling of the valve control system.
  • the flow of cooling water coming from the air heater 10 continues, as illustrated in FIG. 2, but the flow of cooling water coming from the radiator 5 begins, as illustrated in FIG. 3.
  • the cooling water flow begins to increase in the heat exchanger 14 and the flow gradually reverses in the branch 17. It can be seen that this inversion occurs from about 5% opening of the thermostatic valve 4.
  • the device of the invention thus makes it possible to obtain an automatic tilting of the direction of flow in the branch 17 of the secondary circuit 13, the supply of cooling water to the heat exchanger 14 being done, either by water cooling from the air heater 10 or the main cooling circuit in the case where no air heater is provided, either by the cooling water coming from the radiator 5 when the thermostatic valve 4 is open.
  • This automatic switchover is obtained in a way extremely simple without requiring the addition of any additional electric pump or any solenoid valve.
  • the absence of a moving part or specific component eliminates all risk of failure.
  • the cooling water supply to the heat exchanger 14 is done permanently and by means of water from the radiator, that is to say after cooling when the thermostatic valve is open, in operation. normal engine.

Landscapes

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

Abstract

The invention relates to a device for cooling a vehicle combustion engine control element comprising a principal coolant flow circuit which passes through the engine (1) and includes a circulation pump (3), a thermostatic valve (4) and a radiator (5). Said inventive device is characterised by the fact that a heat exchanger (14) that can cool the control element is mounted in a secondary circuit (13), downstream of the radiator, between said radiator (5) and the circulation pump (3). Furthermore, a restrictor (16) is mounted in the principal circuit in parallel with the exchanger (14). A branch (17) of the secondary circuit connects the exchanger (14) to the restrictor (16) and in this way the coolant can pass through said branch in either direction depending on whether the thermostatic valve (4) is open or closed.

Description

Dispositif et procédé de refroidissement d'un organe de commande d'un moteur thermique.Device and method for cooling a control member of a heat engine.
La présente invention est relative à un dispositif de refroidissement pour un organe de commande d'un moteur therrmque de véhicule automobile, ainsi qu'à un procédé d'alimentation permanente en liquide de refroidissement d'un échangeur de chaleur destiné à refroidir un tel organe de commande.The present invention relates to a cooling device for a control member of a thermal engine of a motor vehicle, as well as to a method for permanently supplying coolant to a heat exchanger intended to cool such a member. control.
Le moteur d'entraînement des véhicules automobiles peut être refroidi par la mise en circulation d'un liquide de refroidissement, en pratique de l'eau, qui traverse les principales parties du moteur qu'il convient de refroidir. Le circuit de refroidissement inclut essentiellement une pompe de circulation entraînée par le moteur et un radiateur constitué d'un échangeur de chaleur eau/air capable de refroidir l'eau mise en circulation par la pompe. Une vanne thermostatique est également prévue en général, de façon à isoler la partie du circuit principal de refroidissement qui contient le radiateur, pendant la durée du démarrage à froid où un refroidissement excessif du moteur n'est pas souhaité. La vanne thermostatique s'ouvre progressivement en fonction de la température de l'eau mise en circulation, réchauffée par le moteur après la période de démarrage.The drive motor of motor vehicles can be cooled by circulating a coolant, in practice water, which passes through the main parts of the engine which should be cooled. The cooling circuit essentially includes a circulation pump driven by the engine and a radiator consisting of a water / air heat exchanger capable of cooling the water circulated by the pump. A thermostatic valve is also generally provided, so as to isolate the part of the main cooling circuit which contains the radiator, for the duration of the cold start where excessive cooling of the engine is not desired. The thermostatic valve opens gradually as a function of the temperature of the circulating water, heated by the engine after the start-up period.
Le fonctionnement des moteurs à combustion interne nécessite une alimentation en carburant dans les cylindres du moteur ainsi qu'un échappement des gaz brûlés, ces opérations étant réalisées au moyen de soupapes dont le mouvement est généralement commandé par un système de distribution adapté au régime de fonctionnement du moteur. Dans certains moteurs à combustion, il est prévu de commander le mouvement des différentes soupapes au moyen d'un système électrohydraulique ditThe operation of internal combustion engines requires a fuel supply in the engine cylinders as well as an exhaust of the burnt gases, these operations being carried out by means of valves whose movement is generally controlled by a distribution system adapted to the operating regime. of the motor. In certain combustion engines, provision is made for controlling the movement of the various valves by means of an electro-hydraulic system known as
"camless", dans lequel les mouvements des différentes soupapes sont pilotés en fonction d'un diagramme de distribution, la charge du moteur étant en outre contrôlée par le temps d'ouverture des soupapes d'admission. La puissance consommée par un tel système de commande des soupapes entraîne cependant un certain nombre d'inconvénients. Il convient en particulier de pouvoir refroidir convenablement le dispositif de commande."camless", in which the movements of the different valves are controlled according to a distribution diagram, the engine load being further controlled by the opening time of the intake valves. The power consumed by such a control system for valves, however, cause a number of drawbacks. In particular, it is necessary to be able to cool the control device properly.
Le refroidissement peut par exemple être obtenu par une circulation de l'eau de refroidissement s'écoulant dans le circuit principal de refroidissement du moteur. L'adjonction, sans précautions particulières, d'un échangeur de chaleur dans le circuit principal de refroidissement du moteur, présente cependant l'inconvénient que le refroidissement ne se fait pas convenablement d'une manière constante pendant les phases de démarrage du moteur lorsque la vanne thermostatique est fermée et pendant les phases de fonctionnement normal où la vanne thermostatique est ouverte. Une autre solution consistant à utiliser un circuit de refroidissement indépendant, nécessite par ailleurs une pompe à eau électrique supplémentaire et au moins une électro vanne, ce qui complique la structure d'ensemble et en augmente le coût ainsi que les risques de pannes.Cooling can for example be obtained by circulating the cooling water flowing in the main engine cooling circuit. The addition, without special precautions, of a heat exchanger in the main engine cooling circuit, however has the disadvantage that the cooling is not done properly in a constant manner during the engine starting phases when the thermostatic valve is closed and during normal operating phases where the thermostatic valve is open. Another solution consisting in using an independent cooling circuit, also requires an additional electric water pump and at least one solenoid valve, which complicates the overall structure and increases the cost as well as the risk of breakdowns.
La présente invention a pour objet de supprimer ces difficultés et d'assurer le refroidissement d'un organe de commande d'un moteur à combustion de véhicule automobile, par exemple du système de pilotage des soupapes, qui permette le refroidissement constant et permanent quel que soit l'état de la vanne thermostatique.The object of the present invention is to eliminate these difficulties and to ensure the cooling of a control member of a combustion engine of a motor vehicle, for example of the valve control system, which allows constant and permanent cooling whatever or the state of the thermostatic valve.
L'invention a également pour objet d'alimenter en permanence un échangeur de chaleur en liquide de refroidissement provenant du circuit principal de refroidissement du moteur, et ce quelle que soit la position de la vanne thermostatique.The object of the invention is also to continuously supply a heat exchanger with coolant from the main engine cooling circuit, regardless of the position of the thermostatic valve.
Le dispositif de refroidissement de l'invention est destiné à coopérer avec un organe de commande d'un moteur à combustion de véhicule automobile. Le dispositif comprend un circuit principal d'écoulement d'un liquide de refroidissement traversant le moteur et incluant une pompe de circulation, une vanne thermostatique et un radiateur. Un échangeur de chaleur capable de refroidir l'organe de comande est monté dans un circuit secondaire, en aval du radiateur, entre ledit radiateur et la pompe de circulation. Une restriction est montée dans le circuit principal en parallèle de l'échangeur. De cette manière, une branche du circuit secondaire reliant l'échangeur à la restriction, est traversée par le liquide de refroidissement dans un sens ou dans l'autre selon que la vanne thermostatique est ouverte ou fermée.The cooling device of the invention is intended to cooperate with a control member of a combustion engine of a motor vehicle. The device comprises a main circuit for the flow of a coolant passing through the engine and including a circulation pump, a thermostatic valve and a radiator. A heat exchanger capable of cooling the control member is mounted in a secondary circuit, downstream of the radiator, between said radiator and the circulation pump. A restriction is mounted in the main circuit in parallel with the exchanger. In this way, a branch of the secondary circuit connecting the exchanger to the restriction is crossed by the coolant in one direction or the other depending on whether the thermostatic valve is open or closed.
On obtient ainsi de façon simple un basculement automatique de l'alimentation de l'échangeur en liquide de refroidissement. De plus, l'échangeur est alimenté en liquide de refroidissement à température inférieure lorsque la vanne thermostatique est ouverte, ce qui est le cas le plus fréquent.This automatically obtains an automatic changeover of the supply of the exchanger with coolant. In addition, the exchanger is supplied with coolant at a lower temperature when the thermostatic valve is open, which is the most common case.
Dans un mode de réalisation préféré, un échangeur aérothermique destiné au réchauffement de l'habitacle du véhicule est en outre monté dans le circuit principal en aval de la vanne thermo statique, avec sa canalisation de retour reliée en amont de la restriction.In a preferred embodiment, an aerothermal exchanger intended for heating the passenger compartment of the vehicle is also mounted in the main circuit downstream of the thermostatic valve, with its return pipe connected upstream of the restriction.
Dans une utilisation préférée de l'invention, l'organe de commande est conçu pour agir sur les soupapes du moteur.In a preferred use of the invention, the control member is designed to act on the valves of the engine.
L'invention concerne également, de manière plus générale, un procédé d'alimentation permanente en liquide de refroidissement d'un échangeur de chaleur monté dans un circuit secondaire en dérivation d' un circuit principal d'écoulement dont une partie peut être isolée par une vanne de fermeture. Selon ce procédé, une inversion du sens de l'écoulement dans une branche du circuit secondaire, est automatiquement opérée en fonction de la position de la vanne de fermeture, au moyen d'une perte de charge générée dans une portion du circuit principal.The invention also relates, more generally, to a method for permanently supplying coolant to a heat exchanger mounted in a secondary circuit bypassing a main flow circuit, a part of which can be isolated by a closing valve. According to this method, an inversion of the direction of flow in a branch of the secondary circuit is automatically operated as a function of the position of the closing valve, by means of a pressure drop generated in a portion of the main circuit.
Dans un mode d'utilisation préféré, la vanne se ferme lorsque la température du liquide de refroidissement atteint une valeur déterminée. Le procédé de l'invention est particulièrement avantageux lorsque l'échangeur de chaleur est utilisé pour refroidir un organe de commande des soupapes d'un moteur thermique, notamment dans un véhicule automobile.In a preferred mode of use, the valve closes when the temperature of the coolant reaches a determined value. The method of the invention is particularly advantageous when the heat exchanger is used to cool a valve control member of a heat engine, in particular in a motor vehicle.
L'invention sera mieux comprise à l'étude d'un mode de réalisation particulier pris à titre d'exemple nullement limitatif et illustré par les dessins annexés, sur lesquels :The invention will be better understood from the study of a particular embodiment taken by way of nonlimiting example and illustrated by the appended drawings, in which:
- la figure 1 représente schématiquement un dispositif de refroidissement selon l'invention;- Figure 1 schematically shows a cooling device according to the invention;
- la figure 2 illustre la circulation du liquide de refroidissement dans le dispositif illustré sur la figure 1, lorsque la vanne thermostatique est fermée; et- Figure 2 illustrates the circulation of the coolant in the device illustrated in Figure 1, when the thermostatic valve is closed; and
- la figure 3 illustre schématiquement la circulation du liquide de refroidissement dans le dispositif illustré sur la figure 1, lorsque la vanne thermostatique est ouverte. 5 Tel qu'il est représenté sur la figure 1 , de manière schématique, le dispositif de refroidissement de l'invention est utilisé en association avec un moteur thermique schématisé par le cadre en tirets 1. Le moteur thermique 1 est refroidi par une circulation d'eau s'écoulant dans un circuit principal d'écoulement 2 qui inclut une pompe de circulation 3, une- Figure 3 schematically illustrates the circulation of the coolant in the device illustrated in Figure 1, when the thermostatic valve is open. 5 As shown in FIG. 1, schematically, the cooling device of the invention is used in association with a heat engine shown diagrammatically by the dashed frame 1. The heat engine 1 is cooled by a circulation d water flowing in a main flow circuit 2 which includes a circulation pump 3, a
10 vanne thermostatique 4 et un radiateur 5 placé à l'extérieur du moteur 1. Le circuit 2 peut être plus ou moins rempli d'eau de refroidissement grâce à l'existence d'un bocal de remplissage 6 jouant le rôle de vase d'expansion et monté en dérivation par les conduits 7 et 8 sur l'échangeur de chaleur air/eau qui constitue le radiateur 5. A la sortie de la pompe de circulation10 thermostatic valve 4 and a radiator 5 placed outside the engine 1. The circuit 2 can be more or less filled with cooling water thanks to the existence of a filling jar 6 playing the role of a vase of expansion and mounted in diversion by conduits 7 and 8 on the air / water heat exchanger which constitutes the radiator 5. At the outlet of the circulation pump
15 3, l'eau de refroidissement véhiculée par la conduite 9, traverse la vanne thermostatique 4 dont l'ouverture et la fermeture sont commandées par un élément à dilatation 4a sur lequel agit la température de l'eau traversant la vanne thermostatique 4.15 3, the cooling water conveyed by the line 9 passes through the thermostatic valve 4, the opening and closing of which are controlled by an expansion element 4a on which the temperature of the water passing through the thermostatic valve 4 acts.
Dans l'exemple illustré sur la figure 1, l'habitacle du véhiculeIn the example illustrated in FIG. 1, the passenger compartment of the vehicle
20 automobile qui est équipé du moteur 1 comprend un dispositif de chauffage incluant un aérotherme 10 sous la forme d'un échangeur de chaleur air/eau qui est alimenté par l'eau de refroidissement du circuit principal 2 provenant directement de la vanne thermostatique 4 par la conduite 11. La sortie de l'aérotherme 10 est reliée par la conduite 11 a à un20 automobile which is equipped with the engine 1 comprises a heating device including an air heater 10 in the form of an air / water heat exchanger which is supplied by the cooling water of the main circuit 2 coming directly from the thermostatic valve 4 by line 11. The outlet of the air heater 10 is connected via line 11 a to a
25 circuit secondaire 13, dans lequel est monté un échangeur de chaleur 14 capable de refroidir le système de pilotage des différentes soupapes du moteur 1 , ce système n'étant pas représenté sur la figure. La conduite de sortie l ia provenant de l'aérotherme 10 débouche au point 12 dans une branche 15 du circuit secondaire 13, la branche 15 contenant une25 secondary circuit 13, in which is mounted a heat exchanger 14 capable of cooling the control system of the various valves of the engine 1, this system not being shown in the figure. The outlet pipe l ia coming from the air heater 10 opens at point 12 in a branch 15 of the secondary circuit 13, the branch 15 containing a
30 restriction 16, capable de créer une perte de charge dans l'écoulement. L'eau s'écoulant dans la conduite l ia à la sortie de l'aérotherme 10 se sépare au point 12 en deux flux, le premier par la branche 15, et le deuxième par une branche 17 du circuit secondaire 13.30 restriction 16, capable of creating a pressure drop in the flow. The water flowing in the line l ia at the outlet of the air heater 10 separates at point 12 into two flows, the first by the branch 15, and the second by a branch 17 of the secondary circuit 13.
L'échangeur de chaleur 14 reçoit de l'eau de refroidissement parThe heat exchanger 14 receives cooling water by
35. la conduite 18 qui est reliée au point 19 à la branche 17. En sortie de l'échangeur 14, l'eau revient par la conduite 20 en aval de la restriction 16 au point 21. La conduite de sortie 22 de la restriction 16 revient sur l'admission de la pompé de circulation 3 en traversant le moteur 1 de façon à en refroidir les parties appropriées. 5 Dans le mode de réalisation illustré sur la figure 1, on a également représenté un alternateur 23 refroidi par circulation d'eau et alimenté par la conduite 24 branchée sur la conduite l ia en sortie de l'aérotherme 10, l'eau de refroidissement revenant par la conduite 25 après avoir traversé l'alternateur 23 sur la conduite 22 en amont de l'admission35. line 18 which is connected at point 19 to branch 17. At the outlet of the exchanger 14, the water returns via the pipe 20 downstream of the restriction 16 at point 21. The outlet pipe 22 of the restriction 16 returns to the intake of the circulation pump 3 by passing through the engine 1 so to cool the appropriate parts. 5 In the embodiment illustrated in FIG. 1, there is also shown an alternator 23 cooled by circulation of water and supplied by line 24 connected to line l ia at the outlet of the air heater 10, the cooling water returning via line 25 after passing through the alternator 23 on line 22 upstream of the intake
10 de la pompe de circulation 3.10 of the circulation pump 3.
La circulation de l'eau de refroidissement dans le radiateur 5 se fait grâce à la conduite d'alimentation 26 dont l'entrée est plus ou moins obturée par la vanne thermostatique 4 en fonction de la température de l'eau de refroidissement traversant la vanne 4. L'eau de refroidissementThe circulation of the cooling water in the radiator 5 takes place thanks to the supply line 26, the inlet of which is more or less blocked by the thermostatic valve 4 as a function of the temperature of the cooling water passing through the valve. 4. Cooling water
15 ayant traversé le radiateur 5 revient par la conduite 27 sur la branche 17 du circuit secondaire 13 au point 19.15 having passed through the radiator 5 returns via line 27 to branch 17 of the secondary circuit 13 at point 19.
Le fonctionnement du dispositif illustré sur la figure 1 est le suivant, en référence aux figures 2 et 3.The operation of the device illustrated in FIG. 1 is as follows, with reference to FIGS. 2 and 3.
Lorsque la vanne thermostatique 4 est fermée, c'est-à-direWhen the thermostatic valve 4 is closed, i.e.
20 pendant la phase de démarrage à froid du moteur 1, l'eau de refroidissement ne pénètre pas dans la conduite 26 et ne traverse donc pas le radiateur 5. C'est ce qui a été représenté en traits fins sur la figure 2. Au contraire, l'eau de refroidissement mise en circulation par la pompe 3 s'écoule par la conduite 9 à travers la vanne 4, puis par la conduite l i a20 during the cold start phase of the engine 1, the cooling water does not enter the line 26 and therefore does not pass through the radiator 5. This has been shown in thin lines in FIG. 2. At on the contrary, the cooling water circulated by the pump 3 flows through line 9 through valve 4, then through line lia
25 travers l'aérotherme 10, les conduites dans lesquelles circule l'eau de refroidissement ayant été représentées sur la figure 2 en traits de plus grande largeur. A la sortie de l'aérotherme 10, l'eau provenant de la conduite 1 la se sépare en deux flux. Le premier par la branche 15 traverse la restriction 16 qui crée une perte de charge, puis revient par la conduite25 through the air heater 10, the conduits in which the cooling water circulates having been shown in FIG. 2 in larger lines. At the outlet of the air heater 10, the water coming from the pipe 1 separates it into two flows. The first through the branch 15 crosses the restriction 16 which creates a pressure drop, then returns via the pipe
30. 22 sur la pompe de circulation 3. Le deuxième flux retourne également à la pompe de circulation 3, cette fois en passant par la branche 17 puis par l'échangeur de chaleur 14 en traversant le circuit secondaire 13. Ce deuxième flux évite la perte de charge due à la restriction 16. Indépendamment, l'alternateur 23 est alimenté par la conduite 24 en eau de30. 22 on the circulation pump 3. The second flow also returns to the circulation pump 3, this time passing through the branch 17 then through the heat exchanger 14 by crossing the secondary circuit 13. This second flow avoids the pressure drop due to restriction 16. Independently, the alternator 23 is supplied by line 24 with
35 refroidissement provenant de l'aérotherme 10. La figure 3 illustre les différents écoulements dans le dispositif de l'invention lorsque la vanne thermostatique 4 est complètement ouverte. Dans ce cas, la totalité de l'eau de refroidissement provenant de l'aérotherme 10 par la conduite 1 la se dirige par la branche 15 à travers la restriction 16 pour revenir par la conduite 22 à la pompe de circulation 3.35 cooling from the heater 10. FIG. 3 illustrates the different flows in the device of the invention when the thermostatic valve 4 is completely open. In this case, all of the cooling water coming from the air heater 10 through line 1a is directed by branch 15 through restriction 16 to return via line 22 to the circulation pump 3.
Mais, la vanne thermostatique 4 étant ouverte, l'eau de refroidissement s'écoule également dans la conduite 26, traverse le radiateur 5 et revient par la conduite 27 jusqu'au point 19 où le flux se sépare en deux parties. La première partie traverse l'échangeur de chaleur 14 par le circuit secondaire 13 avant de revenir à la pompe de circulation 3 par la conduiteHowever, the thermostatic valve 4 being open, the cooling water also flows in line 26, passes through the radiator 5 and returns via line 27 to point 19 where the flow separates into two parts. The first part passes through the heat exchanger 14 via the secondary circuit 13 before returning to the circulation pump 3 via the pipe.
22. La deuxième partie, au contraire, s'écoule par la branche 17, traverse la restriction 16 avant de revenir par la conduite 22 à la pompe de circulation 3.22. The second part, on the contrary, flows through the branch 17, crosses the restriction 16 before returning via the line 22 to the circulation pump 3.
La circulation de l'eau dans la branche 17 a donc été inversée par rapport à celle qui existait lorsque la vanne thermostatique 4 était fermée, comme illustré sur la figure 2. Le débit dans le radiateur 5 est ici maximal, comme dans l'échangeur de chaleur 14. De plus, l'échangeur 14 est traversé par de l'eau qui a été refroidie par le radiateur 5, ce qui améliore le refroidissement du système de commande des soupapes. Au cours de la phase d'ouverture progressive de la vanne thermo statique 4, le flux d'eau de refroidissement provenant de l'aérotherme 10 continue, comme illustré sur la figure 2, mais le flux d'eau de refroidissement provenant du radiateur 5 commence, comme illustré sur la figure 3. Le débit d'eau de refroidissement commence à augmenter dans l'échangeur de chaleur 14 et le flux s'inverse progressivement dans la branche 17. On constate que cette inversion se produit à partir d'environ 5% d'ouverture de la vanne thermo statique 4.The circulation of water in branch 17 has therefore been reversed compared to that which existed when the thermostatic valve 4 was closed, as illustrated in FIG. 2. The flow rate in the radiator 5 is here maximum, as in the exchanger heat 14. In addition, the exchanger 14 is traversed by water which has been cooled by the radiator 5, which improves the cooling of the valve control system. During the progressive opening phase of the thermostatic valve 4, the flow of cooling water coming from the air heater 10 continues, as illustrated in FIG. 2, but the flow of cooling water coming from the radiator 5 begins, as illustrated in FIG. 3. The cooling water flow begins to increase in the heat exchanger 14 and the flow gradually reverses in the branch 17. It can be seen that this inversion occurs from about 5% opening of the thermostatic valve 4.
Le dispositif de l'invention permet ainsi d'obtenir une bascule automatique du sens d'écoulement dans la branche 17 du circuit secondaire 13, l'alimentation en eau de refroidissement de l'échangeur de chaleur 14 se faisant, soit par l'eau de refroidissement en provenance de l'aérotherme 10 ou du circuit principal de refroidissement dans le cas où aucun aérotherme n'est prévu, soit par l'eau de refroidissement provenant du radiateur 5 lorsque la vanne thermostatique 4 est ouverte. Ce basculement automatique est obtenu d'une façon extrêmement simple sans nécessiter l'adjonction d'une quelconque pompe électrique supplémentaire, ni d'une quelconque électrovanne. L'absence de pièce en mouvement ou de composant spécifique supprime tous risques de panne. De plus, l'alimentation en eau de refroidissement de l'échangeur de chaleur 14 se fait de façon permanente et au moyen d'eau provenant du radiateur, c'est-à-dire après refroidissement lorsque la vanne thermostatique est ouverte, en fonctionnement normal du moteur.The device of the invention thus makes it possible to obtain an automatic tilting of the direction of flow in the branch 17 of the secondary circuit 13, the supply of cooling water to the heat exchanger 14 being done, either by water cooling from the air heater 10 or the main cooling circuit in the case where no air heater is provided, either by the cooling water coming from the radiator 5 when the thermostatic valve 4 is open. This automatic switchover is obtained in a way extremely simple without requiring the addition of any additional electric pump or any solenoid valve. The absence of a moving part or specific component eliminates all risk of failure. In addition, the cooling water supply to the heat exchanger 14 is done permanently and by means of water from the radiator, that is to say after cooling when the thermostatic valve is open, in operation. normal engine.
Bien que dans l'exemple illustré, on ait représenté l'adjonction d'un échangeur aérothermique 10, on comprendra que le dispositif de l'invention puisse également fonctionner en l'absence de cet échangeur, l'eau de refroidissement issue de la vanne thermostatique 4 revenant alors directement sur le circuit secondaire 13. Although in the example illustrated, the addition of an aerothermal exchanger 10 has been shown, it will be understood that the device of the invention can also operate in the absence of this exchanger, the cooling water coming from the valve thermostatic 4 then returning directly to the secondary circuit 13.

Claims

REVENDICATIONS
1 -Dispositif de refroidissement d'un organe de corn ande d'un moteur à combustion de véhicule automobile comprenant un circuit principal d'écoulement d'un liquide de refroidissement traversant le moteur (1) et incluant une pompe de circulation (3), une vanne thermostatique (4) et un radiateur (5), caractérisé par le fait qu'un échangeur de chaleur (14) capable de refroidir l'organe de cornmande est monté dans un circuit secondaire (13), en aval du radiateur, entre ledit radiateur (5) et la pompe de circulation (3), qu'une restriction (16) est montée dans le circuit principal en parallèle de l'échangeur (14), une branche (17) du circuit secondaire reliant l'échangeur (14) à la restriction1 -Device for cooling a horn member of a combustion engine of a motor vehicle comprising a main circuit for the flow of a coolant passing through the engine (1) and including a circulation pump (3), a thermostatic valve (4) and a radiator (5), characterized in that a heat exchanger (14) capable of cooling the control member is mounted in a secondary circuit (13), downstream of the radiator, between said radiator (5) and the circulation pump (3), that a restriction (16) is mounted in the main circuit in parallel with the exchanger (14), a branch (17) of the secondary circuit connecting the exchanger ( 14) restriction
(16), étant traversée par le liquide de refroidissement dans un sens ou dans l'autre selon que la vanne thermo statique (4) est ouverte ou fermée.(16), being traversed by the coolant in one direction or the other depending on whether the thermostatic valve (4) is open or closed.
2-Dispositif selon la revendication 1 , caractérisé par le fait qu'un échangeur aérothermique (10) destiné au réchauffement de l'habitacle du véhicule est monté dans le circuit principal en aval de la vanne thermostatique (4), avec sa canalisation de retour (1 la) reliée en amont de la restriction.2-Device according to claim 1, characterized in that an aerothermal exchanger (10) for heating the passenger compartment of the vehicle is mounted in the main circuit downstream of the thermostatic valve (4), with its return line (1 la) linked upstream of the restriction.
3-Dispositif selon les revendications 1 ou 2, caractérisé par le fait que l'organe de commande agit sur les soupapes du moteur. 4-Procédé d'alimentation permanente en liquide de refroidissement d'un échangeur de chaleur (14) monté dans un circuit secondaire (13) en dérivation d'un circuit principal d'écoulement (2) dont une partie peut être isolée par une vanne de fermeture (4), dans lequel une inversion du sens de l'écoulement dans une branche (17) du circuit secondaire, est automatiquement opérée en fonction de la position de la vanne de fermeture (4), au moyen d'une perte de charge générée dans une portion du circuit principal.3-Device according to claims 1 or 2, characterized in that the control member acts on the valves of the engine. 4-Method for permanent supply of coolant to a heat exchanger (14) mounted in a secondary circuit (13) bypassing a main flow circuit (2), part of which can be isolated by a valve closing (4), in which a reversal of the direction of flow in a branch (17) of the secondary circuit, is automatically operated according to the position of the closing valve (4), by means of a loss of load generated in a portion of the main circuit.
5-Procédé selon la revendication 4, caractérisé par le fait que la vanne (4) se ferme lorsque la température du liquide de refroidissement atteint une valeur déterminée.5-A method according to claim 4, characterized in that the valve (4) closes when the temperature of the coolant reaches a determined value.
6-Procédé selon les revendications 4 ou 5, caractérisé par le fait que l'échangeur de chaleur (14) est utilisé pour refroidir un organe de commande des soupapes d'un moteur thermique. 6-A method according to claims 4 or 5, characterized in that the heat exchanger (14) is used to cool a valve control member of a heat engine.
EP02704825A 2001-02-19 2002-02-14 Device and method for cooling a heat engine control element Expired - Lifetime EP1362169B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0102225 2001-02-19
FR0102225A FR2821120B1 (en) 2001-02-19 2001-02-19 DEVICE AND METHOD FOR COOLING A CONTROL UNIT OF A HEAT ENGINE
PCT/FR2002/000560 WO2002066804A1 (en) 2001-02-19 2002-02-14 Device and method for cooling a heat engine control element

Publications (2)

Publication Number Publication Date
EP1362169A1 true EP1362169A1 (en) 2003-11-19
EP1362169B1 EP1362169B1 (en) 2006-09-06

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EP02704825A Expired - Lifetime EP1362169B1 (en) 2001-02-19 2002-02-14 Device and method for cooling a heat engine control element

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EP (1) EP1362169B1 (en)
DE (1) DE60214515T2 (en)
ES (1) ES2266450T3 (en)
FR (1) FR2821120B1 (en)
WO (1) WO2002066804A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2875885B1 (en) * 2004-09-27 2006-12-01 Renault Sas COOLING DEVICE FOR AUTOMATIC GEARBOX OF MOTOR VEHICLE AND ASSOCIATED METHOD
FR2883807B1 (en) * 2005-04-01 2008-09-12 Renault Sas DEVICE AND METHOD FOR COOLING THE ENGINE AND A VEHICLE ORGAN
ES2334616A1 (en) * 2008-02-04 2010-03-12 Universidade De Santiago De Compostela Superconducting current limiter integrated in the heat exchanger of a thermoacoustic refrigerator
FR2945482B1 (en) * 2009-05-18 2011-05-06 Peugeot Citroen Automobiles Sa ADJUSTABLE RESTRICTION, CIRCUIT CIRCUIT OF A FLUID AND VEHICLE EQUIPPED WITH THIS RESTRICTION

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
FR2341041A1 (en) * 1976-02-10 1977-09-09 Chausson Usines Sa DEVICE FOR REGULATING THE TEMPERATURE OF A SUPERCHARGED DIESEL ENGINE
FR2659127B1 (en) * 1990-03-05 1992-07-03 Peugeot FOUR-WAY CONNECTION OF COMPACT FORM AND ITS USE ON THE COOLING CIRCUIT OF A MOTOR VEHICLE.
JP3555269B2 (en) * 1995-08-31 2004-08-18 株式会社デンソー Vehicle cooling water temperature control system
FR2748428B1 (en) * 1996-05-07 1998-06-19 Renault COOLING SYSTEM FOR HYBRID PROPULSION VEHICLE
JP3111922B2 (en) * 1997-04-02 2000-11-27 トヨタ自動車株式会社 Cylinder head structure of internal combustion engine equipped with solenoid valve

Non-Patent Citations (1)

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Title
See references of WO02066804A1 *

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DE60214515D1 (en) 2006-10-19
DE60214515T2 (en) 2007-02-15
FR2821120A1 (en) 2002-08-23
EP1362169B1 (en) 2006-09-06
WO2002066804A1 (en) 2002-08-29
FR2821120B1 (en) 2003-04-18
ES2266450T3 (en) 2007-03-01

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