EP1892398A1 - Device making it possible to control a circuit for circulation of a coolant liquid and a circuit for circulation of lubrication oil of a heat engine of a vehicle - Google Patents

Device making it possible to control a circuit for circulation of a coolant liquid and a circuit for circulation of lubrication oil of a heat engine of a vehicle Download PDF

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Publication number
EP1892398A1
EP1892398A1 EP07111593A EP07111593A EP1892398A1 EP 1892398 A1 EP1892398 A1 EP 1892398A1 EP 07111593 A EP07111593 A EP 07111593A EP 07111593 A EP07111593 A EP 07111593A EP 1892398 A1 EP1892398 A1 EP 1892398A1
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EP
European Patent Office
Prior art keywords
coolant
temperature
oil
liquid
circulation
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.)
Withdrawn
Application number
EP07111593A
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German (de)
French (fr)
Inventor
Christian Noiret
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1892398A1 publication Critical patent/EP1892398A1/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/005—Controlling temperature of lubricant
    • 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
    • F01P2037/00—Controlling
    • F01P2037/02—Controlling starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/04—Lubricant cooler
    • 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

Definitions

  • the present invention relates to a device for controlling a coolant circulation circuit and a lubricating oil circulation circuit of a vehicle engine, such as a motor vehicle.
  • the reduction of pollutant emissions, in particular NOx emitted by a diesel engine can be achieved by lowering the temperature of the engine.
  • FIG. 1 represents a cooling circuit of a motor vehicle heat engine 1 traversed by a cooling liquid, such as water, under the action of a circulation pump 2 operating in a closed circuit.
  • This circuit is fed via a calorstat or thermostat 3 with a two-way valve 3a, a liquid inlet 4 of which is connected to an inlet of cooling liquid coming from the cylinder head of the engine 1 via a pipe 5.
  • the latter communicates via conduits 6, 7, 8, respectively with a heater 9 for heating the passenger compartment of the vehicle, a cooling radiator 10 of the engine 1 via the thermostat 3 and a liquid / oil exchanger 11 for cooling the pressurized lubricating oil circulating in the engine 1 via an oil pump 12.
  • the heater 9 and the exchanger 11 are permanently traversed by the coolant while the radiator 10 is traversed by this liquid when the thermostat opens at a predetermined temperature as will be seen below.
  • the heat engine 1 is provided with an exhaust gas turbocharger shown schematically at 13 and whose turbine 14, having its axis rotatably mounted in the body 15 of the turbocharger 13, is driven by the exhaust gas of the engine 1 so that the air entering the turbocharger 13 as symbolized by the arrow F1 is compressed and supplied to the engine, the arrow F2 symbolizing the exhaust gas after passing through the turbocharger, the compressed air outlet to the inlet of the motor 1 not shown.
  • the turbocharger 13 is supplied with pressurized lubricating oil from the heat engine 1 as indicated in AL, this oil passing through the body 15 of the turbocharger 13 to lubricate the bearings of the axis or shaft of the turbine 14 and being removed from the turbocharger as indicated in S.
  • the lubricating oil outlet of the exchanger 11 is connected in particular to the supply inlet AL of the turbocompressor 13.
  • the thermostat 3 opens to provide a flow of coolant to the radiator 10.
  • Such a known thermal engine cooling circuit does not make it possible to reduce both the fuel consumption during cold running of the engine in order to rapidly reduce the mechanical friction losses of the various parts of the engine and the pollutant emissions of the engine by lowering the engine. the coolant temperature of it.
  • the present invention aims to solve the above problem of known cooling circuits of thermal engines.
  • the device for controlling a cooling circuit of a vehicle engine, such as a motor vehicle, traversed by a cooling liquid, such as water, under the a circulating pump action which circuit comprises a thermostatic valve assembly receiving coolant from the engine, a cooling radiator of the engine that can be traversed by the coolant when the thermostatic valve assembly is open, and a liquid / oil exchanger which can be traversed by the coolant for cooling lubricating oil of the engine circulating in the exchanger under the action of a circulation pump, is characterized in that the thermostatic valve assembly is also connected to the liquid / oil exchanger and is controlled according to the temperature of the coolant at its inlet so as to occupy a first position of cooling fluid circulation to the cooling radiator and the liquid / oil exchanger at a lower coolant temperature value at a first set point temperature of about 40 ° C, a second position of switching off the cooling liquid to the liquid / oil exchanger and circulating the coolant through the cooling radiator to a temperature value of
  • a bypass circuit controlled by a control solenoid valve is connected parallel to the pressurized oil inlet and outlet passages, the solenoid valve being controlled at its open position, when the coolant temperature is lower than the second temperature set point, to allow the circulation of oil in the bypass circuit to increase the flow rate of oil passing through the turbocharger as the oil pressure therethrough and heated by the exhaust gas is higher at a predetermined pressure level which corresponds to a normal operating oil pressure of the hot engine.
  • the turbocharger outlet passage is connected to the inlet of the engine lubricating oil circulation pump.
  • the thermostatic valve assembly comprises two thermostats, one of which makes it possible to put the coolant inlet of this thermostat into communication with the cooling radiator when the temperature of the coolant is equal to or greater than the temperature of the coolant.
  • first setpoint temperature and the other allows to communicate this input with the liquid / oil exchanger when the coolant temperature is equal to or greater than the second setpoint temperature.
  • the common inlet of the cooling liquid to the two thermostats is connected by a pipe to the heater for heating the passenger compartment of the vehicle.
  • the shaft 16 of the turbine of the turbocharger 13 is rotatably mounted in the body 15 thereof by at least two axially spaced bearings of which only one is shown.
  • the pressurized lubricating oil from the engine enters the turbocharger 13 through a bore 18 formed in the body 15 and opening into the space between bearing 17 and shaft 16 to provide lubrication thereof.
  • the lubricating oil passes through the body 15 to be evacuated through the outlet bore 19 of the body 15 as symbolized in S. This outlet bore 19 is connected via a conduit 20 to the inlet of the pump with oil 12.
  • a controlled flow bypass circuit 21 connected parallel to the inlet bores 18 and the outlet bores 19 of the pressurized oil, so as to increase the flow rate of oil passing through the turbocharger 13 as the pressure of the oil therethrough and heated by the exhaust gas is greater than a predetermined pressure level which corresponds to a normal operating oil pressure of the hot engine.
  • the bypass circuit 21 comprises a control solenoid valve 22 controlled at its opening position of the circuit 21 to allow the circulation of oil in this circuit as long as the oil pressure value is greater than that of normal operation of the engine. hot.
  • the solenoid valve 22 makes it possible to control the parallel oil flow as close as possible to the normal operating pressure of this engine and, consequently, to increase the bypass flow rate.
  • the solenoid valve 22 can therefore be controlled so that the oil flow can be derived until the temperature or normal operating pressure of the engine is reached to accelerate the warming of the engine lubricating oil.
  • the bypass circuit 21 with solenoid valve 22 can be integrated into the turbocharger or simply attached thereto without modifying the circulation of the various turbocharger fluids comprising oil, air and exhaust gases compared with existing turbochargers. .
  • the coolant circuit of the heat engine 1 is equipped with two thermostatic valves 23, 24 or calorstats, each of the two-way type, known per se and can be opened depending on the rise in temperature d coolant inlet.
  • the thermostatic valve 23 makes it possible to put the inlet 4 of the cooling liquid coming from the engine cylinder head into communication with the cooling radiator 10 while the thermostatic valve 24 makes it possible to put this input into communication with the liquid / oil exchanger 11 .
  • the thermostatic valve 23 for regulating the flow rate of the coolant to the radiator 10 corresponds to that of the prior art, but its opening, instead of usually occurring at a coolant temperature of about 80 ° C, is performed from a lower coolant temperature of about 40 ° C.
  • the two thermostatic valves 23, 24 are closed so that the cooling liquid circulates only through the heater 9. so as to raise the temperature of the engine to heat the vehicle cabin, the solenoid valve 22 is opened to circulate an additional oil flow through the turbocharger 13 to accelerate the rise in temperature lubricating oil.
  • the thermostatic valve 24 is closed, no flow of the coolant flows through the liquid / oil exchanger 11 so as not to cool the lubricating oil flowing in closed circuit in the engine under the action of the oil pump 12.
  • FIG. 3 represents the situation in which the coolant temperature is between the first setpoint temperature of about 40.degree. C. and a second setpoint temperature of about 80.degree.
  • the thermostatic valve 23 is open from the first setpoint temperature and ensures a flow of coolant through the radiator 10 in order to maintain the coolant temperature at a low level.
  • the thermostatic valve 24 remains closed so that no flow of the coolant flows through the liquid / oil exchanger 11 to ensure the temperature rise of the lubricating oil and, of course, the coolant circulates closed circuit through the heater by the action of the water pump 2.
  • the solenoid valve 22 remains open so that an additional oil flow through the turbocharger 13, oil flow is maintained up to to satisfy the engine oil pressure as previously explained in connection with the operation of the bypass circuit 21 valve 22 of Figure 5, so that the warming of the oil is improved.
  • Fig. 4 shows the situation in which the temperature of the coolant is higher than the second set temperature of about 80 ° C. Under these conditions, the thermostatic valve 23 remains open and the other thermostatic valve 24 opens to allow the circulation of the cooling liquid through the exchanger 11 to ensure cooling of the lubricating oil passing through it and the solenoid valve 22 of the bypass circuit 21 is closed. Of course, the coolant continues to circulate through the heater 9.
  • the invention thus makes it possible to thermally manage the coolant circulation circuits and the lubricating oil of a heat engine by accelerating the temperature rise of the lubricating oil while maintaining the temperature of the coolant at a low level remaining compatible with the comfort in the cabin of the vehicle.
  • the invention makes it possible to maintain a fairly significant difference in temperatures between the coolant and the lubricating oil when the requested power to the motor is relatively low.
  • Such a gap makes it possible to reduce the emission of pollutants, in particular NOx emissions, while reducing the consumption of the engine.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Supercharger (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

The device has thermostatic valves (23, 24) connected to a lubricating oil/coolant i.e. water, exchanger (11) and controlled based on a coolant temperature at a coolant inlet (4) to occupy coolant flow blocking positions. The values block circulation of coolant towards a cooling radiator (10) and the exchanger at a coolant temperature value lower/higher than respective setting temperatures i.e. 40 and 80 degree Celsius, in respective positions. The valves block the circulation towards the exchanger via the radiator at another value comprised between the setting temperatures, in third position.

Description

La présente invention concerne un dispositif permettant de commander un circuit de circulation d'un liquide de refroidissement ainsi qu'un circuit de circulation d'huile de lubrification d'un moteur de véhicule, tel qu'un véhicule automobile.The present invention relates to a device for controlling a coolant circulation circuit and a lubricating oil circulation circuit of a vehicle engine, such as a motor vehicle.

Les contraintes réglementaires de plus en plus sévères sur les émissions de polluants ainsi que les contraintes de l'environnement visant à protéger la planète par réduction de CO2 imposent aux constructeurs d'automobiles à réduire les émissions de polluants et de CO2 ainsi que la consommation en carburant des véhicules compte tenu également de l'attrait commercial que présentent des véhicules consommant peu.Increasingly stringent regulatory constraints on pollutant emissions as well as environmental constraints to protect the planet through CO2 reduction require vehicle manufacturers to reduce pollutant and CO2 emissions as well as fuel consumption. vehicle fuel also given the commercial appeal of low fuel consumption vehicles.

Une grande partie des trajets des véhicules automobiles étant de courte durée, le fonctionnement à froid des moteurs thermiques de ces véhicules conditionne très fortement les résultats relatifs à la consommation de tels moteurs et la pollution occasionnée par ceux-ci.Since a large part of motor vehicle trips is short-lived, the cold running of the engines of these vehicles strongly conditions the results relating to the consumption of such engines and the pollution caused by them.

La réduction de la consommation en carburant lors du fonctionnement à froid d'un moteur de véhicule nécessite de réduire rapidement les pertes mécaniques par frottement des différentes pièces du moteur, ces pertes mécaniques étant importantes à cause de la viscosité élevée de l'huile de lubrification du moteur lors du démarrage à froid de celui-ci.The reduction of the fuel consumption during the cold running of a vehicle engine requires a rapid reduction of the mechanical friction losses of the various parts of the engine, these mechanical losses being high because of the high viscosity of the lubricating oil. engine during cold start of it.

En outre, la réduction des émissions de polluants, en particulier des NOx émis par un moteur thermique de type diesel, peut être obtenue en abaissant la température d'eau du moteur thermique.In addition, the reduction of pollutant emissions, in particular NOx emitted by a diesel engine, can be achieved by lowering the temperature of the engine.

La figure 1 représente un circuit de refroidissement d'un moteur thermique 1 de véhicule automobile parcouru par un liquide de refroidissement, tel que de l'eau, sous l'action d'une pompe de circulation 2 fonctionnant en circuit fermé. Ce circuit est alimenté par l'intermédiaire d'un calorstat ou thermostat 3 à vanne 3a à deux voies dont une entrée de liquide 4 est reliée à une arrivée de liquide de refroidissement en provenance de la culasse du moteur 1 par l'intermédiaire d'une conduite 5. Cette dernière communique par l'intermédiaire de conduites 6, 7, 8, avec respectivement un aérotherme 9 pour le chauffage de l'habitacle du véhicule, un radiateur de refroidissement 10 du moteur 1 par l'intermédiaire du thermostat 3 et un échangeur liquide/huile 11 permettant de refroidir l'huile de lubrification sous pression circulant dans le moteur 1 par l'intermédiaire d'une pompe à huile 12.FIG. 1 represents a cooling circuit of a motor vehicle heat engine 1 traversed by a cooling liquid, such as water, under the action of a circulation pump 2 operating in a closed circuit. This circuit is fed via a calorstat or thermostat 3 with a two-way valve 3a, a liquid inlet 4 of which is connected to an inlet of cooling liquid coming from the cylinder head of the engine 1 via a pipe 5. The latter communicates via conduits 6, 7, 8, respectively with a heater 9 for heating the passenger compartment of the vehicle, a cooling radiator 10 of the engine 1 via the thermostat 3 and a liquid / oil exchanger 11 for cooling the pressurized lubricating oil circulating in the engine 1 via an oil pump 12.

L'aérotherme 9 et l'échangeur 11 sont traversés en permanence par le liquide de refroidissement tandis que le radiateur 10 est traversé par ce liquide lorsque le thermostat s'ouvre à une température déterminée comme on le verra ci-dessous.The heater 9 and the exchanger 11 are permanently traversed by the coolant while the radiator 10 is traversed by this liquid when the thermostat opens at a predetermined temperature as will be seen below.

Le moteur thermique 1 est pourvu d'un turbocompresseur à gaz d'échappement représenté schématiquement en 13 et dont la turbine 14, ayant son axe monté à rotation dans le corps 15 du turbocompresseur 13, est entraînée par les gaz d'échappement du moteur 1 de manière que l'air entrant dans le turbocompresseur 13 comme symbolisé par la flèche F1 soit comprimé et fourni au moteur, la flèche F2 symbolisant l'échappement des gaz après passage dans le turbocompresseur, la sortie d'air comprimé vers l'admission du moteur 1 n'étant pas représentée.The heat engine 1 is provided with an exhaust gas turbocharger shown schematically at 13 and whose turbine 14, having its axis rotatably mounted in the body 15 of the turbocharger 13, is driven by the exhaust gas of the engine 1 so that the air entering the turbocharger 13 as symbolized by the arrow F1 is compressed and supplied to the engine, the arrow F2 symbolizing the exhaust gas after passing through the turbocharger, the compressed air outlet to the inlet of the motor 1 not shown.

Le turbocompresseur 13 est alimenté en huile de lubrification sous pression provenant du moteur thermique 1 comme indiqué en AL, cette huile traversant le corps 15 du turbocompresseur 13 pour lubrifier les paliers de l'axe ou arbre de la turbine 14 et étant évacuée du turbocompresseur comme indiqué en S.The turbocharger 13 is supplied with pressurized lubricating oil from the heat engine 1 as indicated in AL, this oil passing through the body 15 of the turbocharger 13 to lubricate the bearings of the axis or shaft of the turbine 14 and being removed from the turbocharger as indicated in S.

La sortie en huile de lubrification de l'échangeur 11 est reliée notamment à l'entrée d'alimentation AL du turbocompresseur 13.The lubricating oil outlet of the exchanger 11 is connected in particular to the supply inlet AL of the turbocompressor 13.

Lorsque la température du liquide de refroidissement à l'entrée 4 du thermostat 3 atteint une température habituelle d'environ 80°C, le thermostat 3 s'ouvre pour fournir un débit de liquide de refroidissement au radiateur 10.When the temperature of the coolant at the inlet 4 of the thermostat 3 reaches a usual temperature of about 80 ° C, the thermostat 3 opens to provide a flow of coolant to the radiator 10.

Un tel circuit connu de refroidissement de moteur thermique ne permet pas de réduire à la fois la consommation en carburant en fonctionnement à froid du moteur pour réduire rapidement les pertes mécaniques par frottement des différentes pièces du moteur et les émissions de polluants du moteur par abaissement de la température du liquide de refroidissement de celui-ci.Such a known thermal engine cooling circuit does not make it possible to reduce both the fuel consumption during cold running of the engine in order to rapidly reduce the mechanical friction losses of the various parts of the engine and the pollutant emissions of the engine by lowering the engine. the coolant temperature of it.

La présente invention a pour but de résoudre le problème ci-dessus des circuits de refroidissement connus de moteurs thermiques.The present invention aims to solve the above problem of known cooling circuits of thermal engines.

A cet effet, selon l'invention, le dispositif permettant de commander un circuit de refroidissement d'un moteur thermique de véhicule, tel qu'un véhicule automobile, parcouru par un liquide de refroidissement, tel que de l'eau, sous l'action d'une pompe de circulation, lequel circuit comprend un ensemble formant vanne thermostatique recevant du liquide de refroidissement provenant du moteur, un radiateur de refroidissement du moteur pouvant être parcouru par le liquide de refroidissement lorsque l'ensemble formant vanne thermostatique est ouvert, et un échangeur liquide/huile pouvant être parcouru par le liquide de refroidissement pour refroidir de l'huile de lubrification du moteur circulant dans l'échangeur sous l'action d'une pompe de circulation, est caractérisé en ce que l'ensemble formant vanne thermostatique est raccordé également à l'échangeur liquide/huile et est commandé en fonction de la température du liquide de refroidissement à son entrée de manière à occuper une première position de coupure de circulation du liquide de refroidissement vers le radiateur de refroidissement et l'échangeur liquide/huile à une valeur de température du liquide de refroidissement inférieure à une première température de consigne d'environ 40°C, une seconde position de coupure de circulation du liquide de refroidissement vers l'échangeur liquide/huile et de circulation du liquide de refroidissement à travers le radiateur de refroidissement à une valeur de température du liquide de refroidissement comprise entre la première température de consigne et une seconde température de consigne d'environ 80°C, et une troisième position de circulation du liquide de refroidissement à travers le radiateur de refroidissement et l'échangeur liquide/huile à une température de liquide de refroidissement supérieure à la seconde température de consigne.For this purpose, according to the invention, the device for controlling a cooling circuit of a vehicle engine, such as a motor vehicle, traversed by a cooling liquid, such as water, under the a circulating pump action, which circuit comprises a thermostatic valve assembly receiving coolant from the engine, a cooling radiator of the engine that can be traversed by the coolant when the thermostatic valve assembly is open, and a liquid / oil exchanger which can be traversed by the coolant for cooling lubricating oil of the engine circulating in the exchanger under the action of a circulation pump, is characterized in that the thermostatic valve assembly is also connected to the liquid / oil exchanger and is controlled according to the temperature of the coolant at its inlet so as to occupy a first position of cooling fluid circulation to the cooling radiator and the liquid / oil exchanger at a lower coolant temperature value at a first set point temperature of about 40 ° C, a second position of switching off the cooling liquid to the liquid / oil exchanger and circulating the coolant through the cooling radiator to a temperature value of coolant between the first set temperature and a second set point temperature of about 80 ° C, and a third coolant flow position through the cooling radiator and the liquid / oil exchanger at a temperature of coolant higher than the second storage temperature e.

Lorsque le moteur thermique est pourvu d'un turbocompresseur à gaz d'échappement comportant un passage d'entrée et un passage de sortie d'huile sous pression pour la lubrification des paliers de l'axe de la turbine du turbocompresseur, un circuit de dérivation à débit contrôlé par une électrovanne de régulation est branché parallèlement aux passages d'entrée et de sortie d'huile sous pression, l'électrovanne étant pilotée à sa position d'ouverture, lorsque la température du liquide de refroidissement est inférieure à la seconde température de consigne, de façon à permettre la circulation d'huile dans le circuit de dérivation pour augmenter le débit de circulation d'huile passant à travers le turbocompresseur tant que la pression d'huile le traversant et réchauffée par les gaz d'échappement est supérieure à un niveau de pression prédéterminé qui correspond à une pression d'huile de fonctionnement normale du moteur à chaud.When the combustion engine is provided with an exhaust gas turbocharger having an inlet passage and a pressurized oil outlet passage for lubricating the bearings of the turbine axis of the turbocharger, a bypass circuit controlled by a control solenoid valve is connected parallel to the pressurized oil inlet and outlet passages, the solenoid valve being controlled at its open position, when the coolant temperature is lower than the second temperature set point, to allow the circulation of oil in the bypass circuit to increase the flow rate of oil passing through the turbocharger as the oil pressure therethrough and heated by the exhaust gas is higher at a predetermined pressure level which corresponds to a normal operating oil pressure of the hot engine.

Le passage de sortie du turbocompresseur est relié à l'entrée de la pompe de circulation de l'huile de lubrification du moteur.The turbocharger outlet passage is connected to the inlet of the engine lubricating oil circulation pump.

De préférence, l'ensemble formant vanne thermostatique comprend deux thermostats, dont l'un permet de mettre en communication l'entrée du liquide de refroidissement de ce thermostat avec le radiateur de refroidissement lorsque la température du liquide de refroidissement est égale ou supérieure à la première température de consigne et l'autre permet de mettre en communication cette entrée avec l'échangeur liquide/huile lorsque la température du liquide de refroidissement est égale ou supérieure à la seconde température de consigne.Preferably, the thermostatic valve assembly comprises two thermostats, one of which makes it possible to put the coolant inlet of this thermostat into communication with the cooling radiator when the temperature of the coolant is equal to or greater than the temperature of the coolant. first setpoint temperature and the other allows to communicate this input with the liquid / oil exchanger when the coolant temperature is equal to or greater than the second setpoint temperature.

L'entrée commune d'arrivée du liquide de refroidissement aux deux thermostats est reliée par une conduite à l'aérotherme pour le chauffage de l'habitacle du véhicule.The common inlet of the cooling liquid to the two thermostats is connected by a pipe to the heater for heating the passenger compartment of the vehicle.

L'invention sera mieux comprise, et d'autres buts, caractéristiques, détails et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention et dans lesquels :

  • la figure 1 représente un moteur thermique pourvu de circuits connus de circulation de liquide de refroidissement et de circulation d'huile de lubrification de ce moteur ;
  • la figure 2 représente un moteur thermique équipé de circuits conformes à l'invention permettant la circulation de liquide de refroidissement et d'huile de lubrification du moteur à une température du liquide de refroidissement inférieure à une première température de consigne ;
  • la figure 3 est une vue semblable à celle de la figure 2 et représentant l'état des circuits de circulation du liquide de refroidissement et de l'huile de lubrification du moteur à une température du liquide de refroidissement comprise entre la première température de consigne et une seconde température de consigne ;
  • la figure 4 est une vue semblable à celle de la figure 2 représentant l'état des circuits de circulation du liquide de refroidissement et de l'huile de lubrification du moteur à une température du liquide de refroidissement supérieure à la seconde température de consigne ; et
  • la figure 5 est une vue en coupe agrandie suivant la ligne V-V de la figure 2 et représentant un dispositif permettant d'accélérer la montée en température de l'huile de lubrification traversant le turbocompresseur du moteur thermique des figures 2 à 4.
The invention will be better understood, and other objects, features, details and advantages thereof will appear more clearly in the following explanatory description made with reference to the accompanying schematic drawings given solely by way of example illustrating a embodiment of the invention and in which:
  • FIG. 1 represents a heat engine provided with known circuits for circulation of coolant and circulation of lubricating oil of this engine;
  • FIG. 2 represents a heat engine equipped with circuits according to the invention allowing the circulation of coolant and lubricating oil of the engine at a temperature of the coolant lower than a first setpoint temperature;
  • FIG. 3 is a view similar to that of FIG. 2 and showing the state of the circulation circuits of the coolant and the oil lubricating the engine at a coolant temperature between the first setpoint temperature and a second setpoint temperature;
  • FIG. 4 is a view similar to that of FIG. 2 showing the state of the coolant circulation circuits and the engine lubricating oil at a coolant temperature higher than the second set temperature; and
  • Figure 5 is an enlarged sectional view along line VV of Figure 2 and showing a device for accelerating the rise in temperature of the lubricating oil passing through the turbocharger of the engine of Figures 2 to 4.

Les différents éléments ou composants des circuits de circulation du liquide de refroidissement et d'huile de lubrification du moteur thermique 1 représentés aux figures 2 à 4 et identiques ou accomplissant les mêmes fonctions que ceux des circuits de circulation du liquide de refroidissement et de l'huile du lubrification du moteur thermique de la figure 1, portent les mêmes références et ne seront pas à nouveau détaillés.The various elements or components of the circulation circuits of the coolant and lubricating oil of the engine 1 shown in Figures 2 to 4 and identical or performing the same functions as those of the coolant circulation circuits and the lubricating oil of the heat engine of Figure 1, bear the same references and will not be detailed again.

Selon l'invention, comme représenté aux figures 2 à 5, l'arbre 16 de la turbine du turbocompresseur 13 est monté à rotation dans le corps 15 de celui-ci par au moins deux paliers axialement espacés dont un seul est représenté.According to the invention, as shown in Figures 2 to 5, the shaft 16 of the turbine of the turbocharger 13 is rotatably mounted in the body 15 thereof by at least two axially spaced bearings of which only one is shown.

L'huile de lubrification sous pression provenant du moteur pénètre dans le turbocompresseur 13 au travers d'un perçage 18 réalisé dans le corps 15 et débouchant dans l'espace entre palier 17 et arbre 16 pour assurer une lubrification de ceux-ci. L'huile de lubrification traverse le corps 15 pour être évacuée au travers du perçage de sortie 19 du corps 15 comme symbolisé en S. Ce perçage de sortie 19 est raccordé par l'intermédiaire d'un conduit 20 à l'entrée de la pompe à l'huile 12.The pressurized lubricating oil from the engine enters the turbocharger 13 through a bore 18 formed in the body 15 and opening into the space between bearing 17 and shaft 16 to provide lubrication thereof. The lubricating oil passes through the body 15 to be evacuated through the outlet bore 19 of the body 15 as symbolized in S. This outlet bore 19 is connected via a conduit 20 to the inlet of the pump with oil 12.

Dans le but d'accélérer la montée en température de l'huile de lubrification du moteur 1 traversant le turbocompresseur 13, il est prévu un circuit de dérivation à débit contrôlé 21 branché parallèlement aux perçages d'entrée 18 et de sortie 19 de l'huile sous pression, de manière à augmenter le débit de circulation d'huile passant à travers le turbocompresseur 13 tant que la pression de l'huile le traversant et réchauffée par les gaz d'échappement est supérieure à un niveau de pression prédéterminé qui correspond à une pression d'huile de fonctionnement normale du moteur à chaud.In order to accelerate the rise in temperature of the lubricating oil of the engine 1 passing through the turbocharger 13, there is provided a controlled flow bypass circuit 21 connected parallel to the inlet bores 18 and the outlet bores 19 of the pressurized oil, so as to increase the flow rate of oil passing through the turbocharger 13 as the pressure of the oil therethrough and heated by the exhaust gas is greater than a predetermined pressure level which corresponds to a normal operating oil pressure of the hot engine.

Le circuit de dérivation 21 comprend une électrovanne de régulation 22 pilotée à sa position d'ouverture du circuit 21 pour permettre la circulation d'huile dans ce circuit tant que la valeur de pression d'huile est supérieure à celle de fonctionnement normale du moteur à chaud. L'électrovanne 22 permet de piloter le débit d'huile parallèle au plus près de la pression normale de fonctionnement de ce moteur et, par conséquent, d'augmenter le débit de dérivation.The bypass circuit 21 comprises a control solenoid valve 22 controlled at its opening position of the circuit 21 to allow the circulation of oil in this circuit as long as the oil pressure value is greater than that of normal operation of the engine. hot. The solenoid valve 22 makes it possible to control the parallel oil flow as close as possible to the normal operating pressure of this engine and, consequently, to increase the bypass flow rate.

L'électrovanne 22 peut donc être pilotée de manière que le débit d'huile puisse être dérivé jusqu'à ce que la température ou pression de fonctionnement normale du moteur soit atteinte afin d'accélérer le réchauffement de l'huile de lubrification du moteur.The solenoid valve 22 can therefore be controlled so that the oil flow can be derived until the temperature or normal operating pressure of the engine is reached to accelerate the warming of the engine lubricating oil.

Le circuit de dérivation 21 à électrovanne 22 peut être intégré dans le turbocompresseur ou tout simplement fixé à celui-ci sans modifier la circulation des différents fluides du turbocompresseur comprenant l'huile, l'air et les gaz d'échappement par rapport aux turbocompresseurs existants.The bypass circuit 21 with solenoid valve 22 can be integrated into the turbocharger or simply attached thereto without modifying the circulation of the various turbocharger fluids comprising oil, air and exhaust gases compared with existing turbochargers. .

Par ailleurs, le circuit du liquide de refroidissement du moteur thermique 1 est équipé de deux vannes thermostatiques 23, 24 ou calorstats, chacune du type à deux voies, connues en soi et pouvant s'ouvrir en fonction de l'élévation de la température d'entrée du liquide de refroidissement.Furthermore, the coolant circuit of the heat engine 1 is equipped with two thermostatic valves 23, 24 or calorstats, each of the two-way type, known per se and can be opened depending on the rise in temperature d coolant inlet.

La vanne thermostatique 23 permet de mettre en communication l'entrée 4 du liquide de refroidissement provenant de la culasse du moteur avec le radiateur de refroidissement 10 tandis que la vanne thermostatique 24 permet de mettre en communication cette entrée avec l'échangeur liquide/huile 11.The thermostatic valve 23 makes it possible to put the inlet 4 of the cooling liquid coming from the engine cylinder head into communication with the cooling radiator 10 while the thermostatic valve 24 makes it possible to put this input into communication with the liquid / oil exchanger 11 .

La vanne thermostatique 23 permettant de réguler le débit du liquide de refroidissement vers le radiateur 10 correspond à celle de l'art antérieur, mais son ouverture, au lieu de se produire habituellement à une température du liquide de refroidissement d'environ 80°C, s'effectue à partir d'une température du liquide de refroidissement plus basse d'environ 40°C.The thermostatic valve 23 for regulating the flow rate of the coolant to the radiator 10 corresponds to that of the prior art, but its opening, instead of usually occurring at a coolant temperature of about 80 ° C, is performed from a lower coolant temperature of about 40 ° C.

Comme représenté en figure 2, lorsque la température du liquide de refroidissement est inférieure à la première température de consigne de 40°C, les deux vannes thermostatiques 23, 24 sont fermées de sorte que le liquide de refroidissement circule uniquement à travers l'aérotherme 9 de manière à faire monter la température du moteur pour assurer le chauffage de l'habitacle du véhicule, l'électrovanne 22 est ouverte de manière à faire circuler un débit d'huile supplémentaire au travers du turbocompresseur 13 afin d'accélérer la montée en température de l'huile de lubrification. Enfin, du fait que la vanne thermostatique 24 soit fermée, aucun débit du liquide de refroidissement ne circule à travers l'échangeur liquide/huile 11 afin de ne pas refroidir l'huile de lubrification circulant en circuit fermé dans le moteur sous l'action de la pompe à huile 12.As shown in FIG. 2, when the temperature of the cooling liquid is lower than the first set temperature of 40 ° C., the two thermostatic valves 23, 24 are closed so that the cooling liquid circulates only through the heater 9. so as to raise the temperature of the engine to heat the vehicle cabin, the solenoid valve 22 is opened to circulate an additional oil flow through the turbocharger 13 to accelerate the rise in temperature lubricating oil. Finally, because the thermostatic valve 24 is closed, no flow of the coolant flows through the liquid / oil exchanger 11 so as not to cool the lubricating oil flowing in closed circuit in the engine under the action of the oil pump 12.

La figure 3 représente la situation selon laquelle la température du liquide de refroidissement est comprise entre la première température de consigne d'environ 40°C et une seconde température de consigne d'environ 80°C. Dans ces conditions, la vanne thermostatique 23 est ouverte à partir de la première température de consigne et permet d'assurer un débit de liquide de refroidissement au travers du radiateur 10 afin de maintenir la température du liquide de refroidissement à un faible niveau. La vanne thermostatique 24 reste fermée de sorte qu'aucun débit du liquide de refroidissement ne circule à travers l'échangeur liquide/huile 11 afin de garantir la montée en température de l'huile de lubrification et, bien entendu, du liquide de refroidissement circule en circuit fermé au travers de l'aérotherme sous l'action de la pompe à eau 2. L'électrovanne 22 reste ouverte de façon qu'un débit d'huile supplémentaire traverse le turbocompresseur 13, débit d'huile qui est maintenu à concurrence de satisfaire la pression d'huile moteur comme expliqué précédemment en liaison avec le fonctionnement du circuit de dérivation 21 à vanne 22 de la figure 5, de sorte que le réchauffement de l'huile est amélioré.FIG. 3 represents the situation in which the coolant temperature is between the first setpoint temperature of about 40.degree. C. and a second setpoint temperature of about 80.degree. Under these conditions, the thermostatic valve 23 is open from the first setpoint temperature and ensures a flow of coolant through the radiator 10 in order to maintain the coolant temperature at a low level. The thermostatic valve 24 remains closed so that no flow of the coolant flows through the liquid / oil exchanger 11 to ensure the temperature rise of the lubricating oil and, of course, the coolant circulates closed circuit through the heater by the action of the water pump 2. The solenoid valve 22 remains open so that an additional oil flow through the turbocharger 13, oil flow is maintained up to to satisfy the engine oil pressure as previously explained in connection with the operation of the bypass circuit 21 valve 22 of Figure 5, so that the warming of the oil is improved.

La figure 4 représente la situation selon laquelle la température du liquide de refroidissement est supérieure à la seconde température de consigne d'environ 80°C. Dans ces conditions, la vanne thermostatique 23 reste ouverte et l'autre vanne thermostatique 24 s'ouvre de manière à permettre la circulation du liquide de refroidissement au travers de l'échangeur 11 pour assurer le refroidissement de l'huile de lubrification le traversant et l'électrovanne 22 du circuit de dérivation 21 est fermée. Bien entendu, le liquide de refroidissement continue à circuler au travers de l'aérotherme 9.Fig. 4 shows the situation in which the temperature of the coolant is higher than the second set temperature of about 80 ° C. Under these conditions, the thermostatic valve 23 remains open and the other thermostatic valve 24 opens to allow the circulation of the cooling liquid through the exchanger 11 to ensure cooling of the lubricating oil passing through it and the solenoid valve 22 of the bypass circuit 21 is closed. Of course, the coolant continues to circulate through the heater 9.

L'invention permet donc la gestion thermique des circuits de circulation de liquide de refroidissement et de l'huile de lubrification d'un moteur thermique en accélérant la montée en température de l'huile de lubrification tout en maintenant la température du liquide de refroidissement à un niveau faible restant compatible avec le confort dans l'habitacle du véhicule. L'invention permet de maintenir un écart assez significatif de températures entre le liquide de refroidissement et l'huile de lubrification lorsque la puissance demandée au moteur est relativement faible. Un tel écart permet de réduire l'émission de polluants, en particulier les émissions de NOx, tout en diminuant la consommation du moteur.The invention thus makes it possible to thermally manage the coolant circulation circuits and the lubricating oil of a heat engine by accelerating the temperature rise of the lubricating oil while maintaining the temperature of the coolant at a low level remaining compatible with the comfort in the cabin of the vehicle. The invention makes it possible to maintain a fairly significant difference in temperatures between the coolant and the lubricating oil when the requested power to the motor is relatively low. Such a gap makes it possible to reduce the emission of pollutants, in particular NOx emissions, while reducing the consumption of the engine.

Claims (5)

Dispositif permettant de commander un circuit de refroidissement d'un moteur thermique (1) de véhicule, tel qu'un véhicule automobile, parcouru par un liquide de refroidissement, tel que de l'eau, sous l'action d'une pompe de circulation (2), lequel circuit comprend un ensemble formant vanne thermostatique (23,24) recevant du liquide de refroidissement provenant du moteur (1), un radiateur de refroidissement (10) du moteur pouvant être parcouru par le liquide de refroidissement lorsque l'ensemble formant vanne thermostatique est ouvert, et un échangeur liquide/huile (11) pouvant être parcouru par le liquide de refroidissement pour refroidir de l'huile de lubrification du moteur (1) circulant dans l'échangeur (11) sous l'action d'une pompe de circulation (12), caractérisé en ce que l'ensemble formant vanne thermostatique (23,24) est raccordé également à l'échangeur liquide/huile et est commandé en fonction de la température du liquide de refroidissement à son entrée (4) de manière à occuper une première position de coupure de circulation du liquide de refroidissement vers le radiateur de refroidissement (10) et l'échangeur liquide/huile (11) à une valeur de température du liquide de refroidissement inférieure à une première température de consigne d'environ 40°C, une seconde position de coupure de circulation du liquide de refroidissement vers l'échangeur liquide/huile (11) et de circulation du liquide de refroidissement à travers le radiateur de refroidissement (10) à une valeur de température du liquide de refroidissement comprise entre la première température de consigne et une seconde température de consigne d'environ 80°C, et une troisième position de circulation du liquide de refroidissement à travers le radiateur de refroidissement (10) et l'échangeur liquide/huile (11) à une température du liquide de refroidissement supérieure à la seconde température de consigne.Device for controlling a cooling circuit of a heat engine (1) of a vehicle, such as a motor vehicle, traversed by a cooling liquid, such as water, under the action of a circulation pump (2), which circuit comprises a thermostatic valve assembly (23,24) receiving coolant from the engine (1), wherein a cooling radiator (10) of the engine can be traversed by the coolant when the assembly thermostatic valve is open, and a liquid / oil exchanger (11) which can be traversed by the coolant to cool lubricating oil of the engine (1) circulating in the exchanger (11) under the action of a circulation pump (12), characterized in that the thermostatic valve assembly (23,24) is also connected to the liquid / oil exchanger and is controlled as a function of the temperature of the coolant at its inlet (4). ) in such a way as to occupy a first position in which the cooling liquid circulates towards the cooling radiator (10) and the liquid / oil exchanger (11) at a temperature value of the coolant lower than a first set temperature d about 40 ° C, a second position of cooling liquid circulation to the liquid / oil exchanger (11) and circulation of the coolant through the cooling radiator (10) to a temperature value of the liquid a first cooling temperature between a first set temperature and a second set point temperature of about 80 ° C, and a third coolant circulation position through the cooling radiator (10) and the liquid / oil exchanger (11). ) at a temperature of the liquid of cooling higher than the second set temperature. Dispositif selon la revendication 1, caractérisé en ce que, lorsque le moteur thermique (1) est pourvu d'un turbocompresseur à gaz d'échappement (13) comportant un passage d'entrée (18) et un passage de sortie (19) d'huile sous pression pour la lubrification des paliers (17) de l'axe (16) de la turbine du turbocompresseur (13), un circuit de dérivation (21) à débit contrôlé par une électrovanne de régulation (22) est branché parallèlement aux passages d'entrée et de sortie (18,19) d'huile sous pression, l'électrovanne (22) étant pilotée à sa position d'ouverture, lorsque la température du liquide de refroidissement est inférieure à la seconde température de consigne, de façon à permettre la circulation d'huile dans le circuit de dérivation (21) pour augmenter le débit de circulation d'huile passant à travers le turbocompresseur (13) tant que la pression d'huile le traversant et réchauffée par les gaz d'échappement est supérieure à un niveau de pression prédéterminé qui correspond à une pression d'huile de fonctionnement normal du moteur à chaud.Device according to claim 1, characterized in that , when the heat engine (1) is provided with an exhaust gas turbocharger (13) having an inlet passage (18) and an outlet passage (19) d pressurized oil for the lubrication of the bearings (17) of the turbocharger turbine shaft (13) (13), a flow-controlled bypass circuit (21) is connected in parallel with the control electrovalve (22). inlet and outlet passages (18,19) of pressurized oil, the solenoid valve (22) being controlled at its open position, when the coolant temperature is lower than the second setpoint temperature, so as to allow the circulation of oil in the bypass circuit (21) to increase the flow rate of oil passing through the turbocharger (13) as the oil pressure therethrough and heated by the exhaust gas is greater than a pressure level predetermined that corresponds to a normal operating oil pressure of the hot engine. Dispositif selon la revendication 2, caractérisé en ce que le passage de sortie (19) du turbocompresseur (13) est relié à l'entrée de la pompe de circulation (12) de l'huile de lubrification du moteur.Device according to claim 2, characterized in that the outlet passage (19) of the turbocharger (13) is connected to the inlet of the circulation pump (12) of the engine lubricating oil. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'ensemble formant vanne thermostatique comprend deux thermostats (23,24), dont l'un (23) permet de mettre en communication l'entrée (4) du liquide de refroidissement de ce thermostat avec le radiateur de refroidissement (10) lorsque la température du liquide de refroidissement est égale ou supérieure à la première température de consigne et l'autre (24) permet de mettre en communication cette entrée avec l'échangeur liquide/huile (11) lorsque la température du liquide de refroidissement est égale ou supérieure à la seconde température de consigne.Device according to one of the preceding claims, characterized in that the thermostatic valve assembly comprises two thermostats (23, 24), one (23) of which allows the inlet (4) of the coolant to communicate with each other. of this thermostat with the cooling radiator (10) when the temperature of the coolant is equal to or greater than the first set temperature and the other (24) makes it possible to put this inlet in communication with the liquid / oil exchanger ( 11) when the coolant temperature is equal to or greater than the second set temperature. Dispositif selon la revendication 4, caractérisé en ce que l'entrée commune (4) d'arrivée du liquide de refroidissement aux deux thermostats (23,24) est reliée à l'aérotherme (9) pour le chauffage de l'habitacle du véhicule par une conduite (6).Device according to Claim 4, characterized in that the common inlet (4) for supplying the cooling liquid to the two thermostats (23, 24) is connected to the heater (9) for heating the passenger compartment of the vehicle. by a pipe (6).
EP07111593A 2006-08-09 2007-07-03 Device making it possible to control a circuit for circulation of a coolant liquid and a circuit for circulation of lubrication oil of a heat engine of a vehicle Withdrawn EP1892398A1 (en)

Applications Claiming Priority (1)

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FR0653336A FR2904856B1 (en) 2006-08-09 2006-08-09 DEVICE FOR CONTROLLING A CIRCUIT CIRCUIT FOR A COOLANT AND A LUBRICATING OIL CIRCUIT FOR A VEHICLE HEAT ENGINE

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014018729A1 (en) 2014-12-16 2015-06-25 Daimler Ag Cooling device for cooling an internal combustion engine
US9279360B2 (en) 2013-05-23 2016-03-08 Yamaha Hatsudoki Kabushiki Kaisha Cooling apparatus for internal combustion engine and motorcycle including the same

Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS57124029A (en) * 1981-01-23 1982-08-02 Hitachi Ltd Lubricating oil controller for exhaust gas turbo-supercharger
FR2776707A1 (en) * 1998-03-31 1999-10-01 Peugeot Motor vehicle heat exchange management system
US20020050251A1 (en) 2000-09-18 2002-05-02 Eizo Takahashi Cooling apparatus for liquid-cooled internal combustion engine
WO2004022941A1 (en) * 2002-09-04 2004-03-18 Ford Global Technologies, Llc Engine cooling systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57124029A (en) * 1981-01-23 1982-08-02 Hitachi Ltd Lubricating oil controller for exhaust gas turbo-supercharger
FR2776707A1 (en) * 1998-03-31 1999-10-01 Peugeot Motor vehicle heat exchange management system
US20020050251A1 (en) 2000-09-18 2002-05-02 Eizo Takahashi Cooling apparatus for liquid-cooled internal combustion engine
WO2004022941A1 (en) * 2002-09-04 2004-03-18 Ford Global Technologies, Llc Engine cooling systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9279360B2 (en) 2013-05-23 2016-03-08 Yamaha Hatsudoki Kabushiki Kaisha Cooling apparatus for internal combustion engine and motorcycle including the same
EP2806134B1 (en) * 2013-05-23 2018-01-31 Yamaha Hatsudoki Kabushiki Kaisha Cooling apparatus for internal combustion engine and motorcycle including the same
DE102014018729A1 (en) 2014-12-16 2015-06-25 Daimler Ag Cooling device for cooling an internal combustion engine

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FR2904856B1 (en) 2008-11-14

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