EP1892389B1 - 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
EP1892389B1
EP1892389B1 EP07111596A EP07111596A EP1892389B1 EP 1892389 B1 EP1892389 B1 EP 1892389B1 EP 07111596 A EP07111596 A EP 07111596A EP 07111596 A EP07111596 A EP 07111596A EP 1892389 B1 EP1892389 B1 EP 1892389B1
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EP
European Patent Office
Prior art keywords
coolant
oil
solenoid valve
temperature
circulation
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EP07111596A
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German (de)
French (fr)
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EP1892389A1 (en
Inventor
Christian Noiret
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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Classifications

    • 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
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F02B39/14—Lubrication of pumps; Safety measures therefor

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 an automobile vehicle.
  • Such a device is known to DE 4 400 201 A1 .
  • the reduction of pollutant emissions, in particular NOx emitted by a diesel engine can be achieved by lowering the temperature of the engine.
  • the figure 1 represents a cooling circuit of a motor vehicle engine 1 traversed by a cooling liquid, such as water, under the action of a circulation pump 2 operating in a closed circuit.
  • a cooling liquid such as water
  • 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.
  • 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 in order to allow the circulation of oil in the bypass circuit to increase the flow rate of oil passing through through the turbocharger as long as the oil pressure therethrough and heated by the exhaust gas is greater than a predetermined pressure level which corresponds to a normal engine operating oil pressure while hot.
  • the turbocharger outlet passage is connected to the inlet of the engine lubricating oil circulation pump.
  • the control solenoid valve is controlled at its closed position when the temperature of the coolant is higher than the second set temperature.
  • the solenoid valve assembly comprises two two-way solenoid valves, a first solenoid valve connected in series in the bypass line of the liquid / oil exchanger, and a second solenoid valve connected in series between the inlet of the solenoid valve. exchanger and the point of connection of the bypass line to the connection line of the oil pump to the exchanger, the first solenoid valve being open and the second solenoid valve being closed when the coolant temperature is less than the second setpoint temperature, while the first solenoid valve is closed and the second solenoid valve is open when the coolant temperature is higher than the second setpoint temperature.
  • the solenoid valve assembly comprises a three-way solenoid valve.
  • 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, only one of which 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 normal operating temperature or pressure of the motor 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. .
  • liquid / oil exchanger 11 comprises a bypass line 23 connected to the inlet and the lubricating oil outlet of the exchanger 11 and a solenoid valve 24 is associated with the bypass line 23 to control in all or nothing the flow of oil flowing through the pipe 23.
  • the portion 25a of the line 25 connecting the oil pump 12 to the inlet of the exchanger 11 and which is situated between this inlet and the connection junction of the bypass line 23 to the pipe 25, is provided with a solenoid valve 26 for controlling in all or nothing the oil flow through the exchanger 11.
  • the figure 2 represents the state of the circulation circuits of the coolant and the lubricating oil of the engine 1 when the temperature of the coolant at the inlet 4 of the thermostat 3 is lower than a first set temperature of about 40 ° vs.
  • the thermostat valve 3a occupies a closed position for passage of the cooling liquid towards the radiator 10 and the cooling liquid can circulate in closed circuit through the heater 9 in order to guarantee the rise in temperature of the liquid cooling system to satisfy the comfort of the passenger compartment of the vehicle and through the exchanger 11.
  • the solenoid valve 22 is controlled so as to allow an additional oil flow in the bypass circuit 21 through the turbocharger 13 to accelerate the climb in temperature of the lubricating oil.
  • the solenoid valve 24 is driven to its open position while the solenoid valve 26 is driven to its closed position to ensure the circulation of the lubricating oil through the bypass line 23 and, Therefore, to prevent the circulation of the lubricating oil through the exchanger 11 so as not to cool this oil.
  • the figure 3 represents the state of the circulation circuits of the coolant and lubricating oil of the engine 1 at a temperature of the coolant higher than the first set temperature, but lower than a second setpoint temperature of about 100 ° vs.
  • the valve 3a of the thermostat 3 opens from this first setpoint temperature to ensure the passage of the coolant through the radiator 10 to maintain the temperature of the liquid at a low level.
  • the solenoid valve 22 and the two other solenoid valves 24, 26 occupy their same open and closed position as figure 2 so that the exchanger 11 is short-circuited so as not to cool the lubricating oil and an additional flow of oil passes through the turbocharger 13 to accelerate the temperature rise of the lubricating oil up to the satisfaction of the pressure of this oil as explained previously.
  • the figure 4 represents the state of the coolant circulation circuits and the engine lubricating oil at a coolant temperature higher than the second set temperature.
  • the valve 3a of the thermostat 3 remains in its opening position for passage of the cooling liquid through the radiator 10, the cooling liquid continues to circulate in the heater 9 and the heat exchanger 11, but the solenoid valve 22 is controlled at its closing position of the bypass circuit 21, the solenoid valve 24 is controlled at its closed position preventing the passage of oil under lubricating pressure through the bypass line 23 and the solenoid valve 26 is driven to its open position to allow the oil under pressure from pump 12 to cross the exchanger 11 and to be cooled by the coolant passing through this exchanger.
  • 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 power demanded from the engine 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.

Abstract

The device has an oil/liquid exchanger (11) with a bypass line (23) connected to lubrication oil inlet and outlet of the exchanger. Flow of oil through the line is controlled by solenoid valves (24, 26) driven based on a temperature of a coolant e.g. water, at an inlet (4) of a thermostat (3). The valves occupy a position to stop lubrication oil circulation through the exchanger and to circulate the oil in the line at a temperature value. The valves take another position to stop the oil circulation in the line and to allow circulation of the oil in the exchanger at another temperature value.

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 d'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 an automobile vehicle.

Un tel dispositif est connu du DE 4 400 201 A1 .Such a device is known to DE 4 400 201 A1 .

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 du 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 fuel consumption during the cold running of a vehicle engine requires a rapid reduction of frictional mechanical 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.The figure 1 represents a cooling circuit of a motor vehicle 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 est alimenté par une vanne thermostatique comprenant une entrée recevant du liquide de refroidissement provenant du moteur et une sortie du liquide de refroidissement reliée à un radiateur de refroidissement, l'entrée de réception du liquide de refroidissement étant également reliée à un aérotherme pour le chauffage de l'habitacle du véhicule et à un échangeur liquide/huile pour le refroidissement de l'huile de lubrification du moteur circulant dans l'échangeur sous l'action d'une pompe de circulation, est caractérisé en ce que la vanne thermostatique est pilotée de manière à occuper une position de fermeture de passage du liquide de refroidissement au radiateur à une température de ce liquide inférieure à une première température de consigne d'environ 40°C et une position d'ouverture de circulation du liquide de refroidissement à travers le radiateur à une température de ce liquide supérieure à la première température de consigne et en ce que l'échangeur liquide/huile comprend une conduite de dérivation raccordée aux entrée et sortie d'huile de lubrification de l'échangeur et à débit d'huile contrôlé par un ensemble formant électrovanne piloté en fonction de la température du liquide de refroidissement à l'entrée de la vanne thermostatique de manière à occuper une première position de coupure de circulation d'huile de lubrification au travers de l'échangeur et de circulation d'huile de lubrification dans la conduite de dérivation de l'échangeur à une valeur de température du liquide de refroidissement inférieure à une seconde température de consigne d'environ 100°C et une seconde position de coupure de circulation d'huile de lubrification dans la conduite de dérivation de l'échangeur liquide/huile et de circulation d'huile de lubrification au travers de l'échangeur à une valeur de température du 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 action of a circulation pump, which circuit is fed by a thermostatic valve comprising an inlet receiving coolant from the engine and an outlet of the coolant connected to a cooling radiator, the inlet for receiving the coolant being also connected to a heater for heating the passenger compartment of the vehicle and a liquid / oil exchanger for cooling the engine lubricating oil circulating in the exchanger under the action of a circulation pump, is characterized in that the thermostatic valve is controlled to occupy a passage closure position coolant to the radiator at a temperature of this liquid lower than a first set temperature of about 40 ° C and a position of opening of circulation of the coolant through the radiator at a temperature of this liquid higher than the first set temperature and in that the liquid / oil exchanger comprises a bypass line connected to the inlet and outlet of lubricating oil of the exchanger and oil flow controlled by a solenoid valve assembly controlled according to the the temperature of the coolant at the inlet of the thermostatic valve so as to occupy a first position of cut-off of lubricating oil circulation through the exchanger and circulation of lubricating oil in the bypass line of the exchanger at a coolant temperature value lower than a second setpoint temperature of about 10 0 ° C and a second lubrication oil circulation cut-off position in the bypass line of the liquid / oil exchanger and lubricating oil circulation through the exchanger to a liquid temperature value of cooling higher than the second set temperature.

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 normal 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 in order to allow the circulation of oil in the bypass circuit to increase the flow rate of oil passing through through the turbocharger as long as the oil pressure therethrough and heated by the exhaust gas is greater than a predetermined pressure level which corresponds to a normal engine operating oil pressure while hot.

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.

L'électrovanne de régulation est pilotée à sa position de fermeture lorsque la température du liquide de refroidissement est supérieure à la seconde température de consigne.The control solenoid valve is controlled at its closed position when the temperature of the coolant is higher than the second set temperature.

Selon une première variante de réalisation, l'ensemble formant électrovanne comprend deux électrovannes à deux voies, une première électrovanne raccordée en série dans la conduite de dérivation de l'échangeur liquide/huile et une seconde électrovanne raccordée en série entre l'entrée de l'échangeur et le point de raccordement de la conduite de dérivation à la conduite de raccordement de la pompe à huile à l'échangeur, la première électrovanne étant ouverte et la seconde électrovanne étant fermée lorsque la température du liquide de refroidissement est inférieure à la seconde température de consigne, tandis que la première électrovanne est fermée et la seconde électrovanne est ouverte lorsque la température du liquide de refroidissement est supérieure à la seconde température de consigne.According to a first variant embodiment, the solenoid valve assembly comprises two two-way solenoid valves, a first solenoid valve connected in series in the bypass line of the liquid / oil exchanger, and a second solenoid valve connected in series between the inlet of the solenoid valve. exchanger and the point of connection of the bypass line to the connection line of the oil pump to the exchanger, the first solenoid valve being open and the second solenoid valve being closed when the coolant temperature is less than the second setpoint temperature, while the first solenoid valve is closed and the second solenoid valve is open when the coolant temperature is higher than the second setpoint temperature.

Selon une deuxième variante de réalisation, l'ensemble formant électrovanne comprend une électrovanne à trois voies.According to a second variant embodiment, the solenoid valve assembly comprises a three-way solenoid valve.

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 relative à 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 du 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 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 première température de consigne ;
  • la figure 4 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 supérieure à une 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, characteristics, details and advantages thereof will appear more clearly in the following explanatory description with reference to the accompanying diagrammatic drawings given solely by way of example. relating to an embodiment of the invention and in which:
  • the figure 1 represents a heat engine provided with known circuits for circulating coolant and circulation of lubricating oil of this engine;
  • the figure 2 represents a heat engine equipped with circuits according to the invention allowing the circulation of the cooling liquid and lubricating oil of the engine at a coolant temperature lower than a first setpoint temperature;
  • the figure 3 is a view similar to that of the figure 2 representing the condition of the coolant circulation circuits and the engine lubricating oil at a coolant temperature above the first setpoint temperature;
  • the figure 4 is a view similar to that of the figure 2 and representing the condition of the coolant flow circuits and the engine lubricating oil at a coolant temperature above a second setpoint temperature; and
  • the figure 5 is an enlarged sectional view along line V - V of the figure 2 and representing a device for accelerating the temperature rise of the lubricating oil passing through the turbocharger of the heat engine of the 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 heat 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 combustion engine of the figure 1 , have 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, only one of which 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 normal operating temperature or pressure of the motor 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, l'échangeur liquide/huile 11 comprend une conduite de dérivation 23 raccordée à l'entrée et à la sortie d'huile de lubrification de l'échangeur 11 et une électrovanne 24 est associée à la conduite de dérivation 23 pour contrôler en tout ou rien le débit d'huile circulant à travers la conduite 23.Furthermore, the liquid / oil exchanger 11 comprises a bypass line 23 connected to the inlet and the lubricating oil outlet of the exchanger 11 and a solenoid valve 24 is associated with the bypass line 23 to control in all or nothing the flow of oil flowing through the pipe 23.

La portion 25a de la conduite 25 raccordant la pompe à huile 12 à l'entrée de l'échangeur 11 et qui est située entre cette entrée et la jonction de raccordement de la conduite de dérivation 23 à la conduite 25, est pourvue d'une électrovanne 26 permettant de contrôler en tout ou rien le débit d'huile au travers de l'échangeur 11.The portion 25a of the line 25 connecting the oil pump 12 to the inlet of the exchanger 11 and which is situated between this inlet and the connection junction of the bypass line 23 to the pipe 25, is provided with a solenoid valve 26 for controlling in all or nothing the oil flow through the exchanger 11.

La figure 2 représente l'état des circuits de circulation du liquide de refroidissement et de l'huile de lubrification du moteur 1 lorsque la température du liquide de refroidissement à l'entrée 4 du thermostat 3 est inférieure à une première température de consigne d'environ 40°C. Dans ces conditions, la vanne 3a du thermostat occupe une position de fermeture de passage du liquide de refroidissement vers le radiateur 10 et le liquide de refroidissement peut circuler en circuit fermé au travers de l'aérotherme 9 afin de garantir la montée en température du liquide de refroidissement pour satisfaire au confort de l'habitacle du véhicule et au travers de l'échangeur 11. En outre, l'électrovanne 22 est pilotée de manière à permettre un débit d'huile supplémentaire dans le circuit de dérivation 21 au travers du turbocompresseur 13 afin d'accélérer la montée en température de l'huile de lubrification. Enfin, l'électrovanne 24 est pilotée à sa position d'ouverture tandis que l'électrovanne 26 est pilotée à sa position de fermeture afin d'assurer la circulation de l'huile de lubrification au travers de la conduite de dérivation 23 et, par conséquent, d'empêcher la circulation de l'huile de lubrification au travers de l'échangeur 11 afin de ne pas refroidir cette huile.The figure 2 represents the state of the circulation circuits of the coolant and the lubricating oil of the engine 1 when the temperature of the coolant at the inlet 4 of the thermostat 3 is lower than a first set temperature of about 40 ° vs. Under these conditions, the thermostat valve 3a occupies a closed position for passage of the cooling liquid towards the radiator 10 and the cooling liquid can circulate in closed circuit through the heater 9 in order to guarantee the rise in temperature of the liquid cooling system to satisfy the comfort of the passenger compartment of the vehicle and through the exchanger 11. In addition, the solenoid valve 22 is controlled so as to allow an additional oil flow in the bypass circuit 21 through the turbocharger 13 to accelerate the climb in temperature of the lubricating oil. Finally, the solenoid valve 24 is driven to its open position while the solenoid valve 26 is driven to its closed position to ensure the circulation of the lubricating oil through the bypass line 23 and, Therefore, to prevent the circulation of the lubricating oil through the exchanger 11 so as not to cool this oil.

La figure 3 représente l'état des circuits de circulation du liquide de refroidissement et de l'huile de lubrification du moteur 1 à une température du liquide de refroidissement supérieure à la première température de consigne, mais inférieure à une seconde température de consigne d'environ 100°C. Dans ces conditions, la vanne 3a du thermostat 3 s'ouvre à partir de cette première température de consigne pour assurer le passage du liquide de refroidissement au travers du radiateur 10 afin de maintenir la température de ce liquide à un faible niveau. L'électrovanne 22 ainsi que les deux autres électrovannes 24, 26 occupent leur même position d'ouverture et de fermeture qu'en figure 2 de manière que l'échangeur 11 soit court-circuité afin de ne pas refroidir l'huile de lubrification et qu'un débit d'huile supplémentaire traverse le turbocompresseur 13 pour accélérer la montée en température de l'huile de lubrification à concurrence de satisfaire la pression de cette huile comme expliqué précédemment.The figure 3 represents the state of the circulation circuits of the coolant and lubricating oil of the engine 1 at a temperature of the coolant higher than the first set temperature, but lower than a second setpoint temperature of about 100 ° vs. Under these conditions, the valve 3a of the thermostat 3 opens from this first setpoint temperature to ensure the passage of the coolant through the radiator 10 to maintain the temperature of the liquid at a low level. The solenoid valve 22 and the two other solenoid valves 24, 26 occupy their same open and closed position as figure 2 so that the exchanger 11 is short-circuited so as not to cool the lubricating oil and an additional flow of oil passes through the turbocharger 13 to accelerate the temperature rise of the lubricating oil up to the satisfaction of the pressure of this oil as explained previously.

La figure 4 représente 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. Dans ces conditions, la vanne 3a du thermostat 3 reste à sa position d'ouverture de passage du liquide de refroidissement au travers du radiateur 10, le liquide de refroidissement continue de circuler dans l'aérotherme 9 et l'échangeur 11, mais l'électrovanne 22 est pilotée à sa positon de fermeture du circuit de dérivation 21, l'électrovanne 24 est pilotée à sa position de fermeture empêchant le passage d'huile sous pression de lubrification à travers la conduite de dérivation 23 et l'électrovanne 26 est pilotée à sa position d'ouverture pour permettre à l'huile sous pression provenant de la pompe 12 de traverser l'échangeur 11 et d'être refroidie par le liquide de refroidissement traversant cet échangeur.The figure 4 represents the state of the coolant circulation circuits and the engine lubricating oil at a coolant temperature higher than the second set temperature. Under these conditions, the valve 3a of the thermostat 3 remains in its opening position for passage of the cooling liquid through the radiator 10, the cooling liquid continues to circulate in the heater 9 and the heat exchanger 11, but the solenoid valve 22 is controlled at its closing position of the bypass circuit 21, the solenoid valve 24 is controlled at its closed position preventing the passage of oil under lubricating pressure through the bypass line 23 and the solenoid valve 26 is driven to its open position to allow the oil under pressure from pump 12 to cross the exchanger 11 and to be cooled by the coolant passing through this exchanger.

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 power demanded from the engine 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 (6)

  1. Device for controlling a cooling circuit of an internal combustion engine (1) of a vehicle, such as a motor vehicle, through which flows a coolant, such as water, due to the action of a circulating pump (2), which circuit is fed via a thermostatic valve comprising an inlet (4) receiving coolant coming from the engine (1) and a coolant outlet connected to a cooling radiator (10), the inlet receiving the coolant also being connected to a heater matrix for heating the passenger compartment of the vehicle and to a coolant/oil heat exchanger (11) for cooling the lubricating oil of the engine (1) circulating through the heat exchanger (11) due to the action of a circulating pump (12), characterized in that the thermostatic valve is electronically guided so as to occupy a closed position to prevent the passage of the coolant to the radiator at a temperature of this coolant which is lower than a first temperature setting of approximately 40°C and an open position to allow circulation of the coolant through the radiator at a temperature of this coolant which is higher than the first temperature setting and in that the coolant/oil heat exchanger comprises a by-pass pipe connected to the lubricating oil inlet and outlet of the heat exchanger and with an oil flow controlled by an assembly forming a solenoid valve which is electronically guided according to the temperature of the coolant at the inlet (4) of the thermostatic valve so as to occupy a first position to cut off circulation of lubricating oil through the heat exchanger and circulate lubricating oil through the by-pass pipe of the heat exchanger at a temperature value of the coolant which is lower than a second temperature setting of approximately 100°C and a second position to cut off circulation of lubricating oil through the by-pass pipe of the coolant/oil heat exchanger (11) and circulate lubricating oil through the heat exchanger at a temperature value of the coolant which is higher than the second temperature setting.
  2. Device according to Claim 1, characterized in that, when the internal combustion engine (1) is provided with an exhaust gas turbocharger (13) including a pressurized oil inlet passage (18) and a pressurized oil outlet passage (19) for the lubrication of the bearings (17) of the shaft (16) of the turbine of the turbocharger (13), a by-pass circuit (21) with a flow controlled by a control solenoid valve (22) is connected in parallel with the pressurized oil inlet and outlet passages (18,19), the solenoid valve (22) being electronically guided to its open position, when the temperature of the coolant is lower than the second temperature setting, so as to allow the circulation of oil through the by-pass circuit (21) to increase the oil circulation flow passing through the turbocharger (13) as long as the pressure of oil going through it and heated by the exhaust gases is higher than a preset pressure level which corresponds to a normal operating oil pressure of the engine when hot.
  3. Device according to Claim 2, characterized in that the outlet passage (19) of the turbocharger (13) is connected to the inlet of the lubricating oil circulating pump (12) of the engine.
  4. Device according to Claim 2 or 3, characterized in that the control solenoid valve is electronically guided to its closed position when the temperature of the coolant is higher than the second temperature setting.
  5. Device according to one of the preceding claims, characterized in that the assembly forming a solenoid valve comprises two two-way solenoid valves, a first solenoid valve connected in series in the by-pass pipe of the coolant/oil heat exchanger and a second solenoid valve connected in series between the inlet of the heat exchanger and the connection point of the by-pass pipe to the pipe connecting the oil pump to the heat exchanger, in that the first solenoid valve is open and the second solenoid valve is closed when the temperature of the coolant is lower than the second temperature setting and in that the first solenoid valve is closed and the second solenoid valve is open when the temperature of the coolant is higher than the second temperature setting.
  6. Device according to one of Claims 1 to 4, characterized in that the assembly forming a solenoid valve comprises a three-way solenoid valve.
EP07111596A 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 Active EP1892389B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0653337A FR2904857B1 (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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EP1892389A1 EP1892389A1 (en) 2008-02-27
EP1892389B1 true EP1892389B1 (en) 2009-02-11

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EP (1) EP1892389B1 (en)
AT (1) ATE422605T1 (en)
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CN107905867A (en) * 2017-12-22 2018-04-13 潍柴西港新能源动力有限公司 Engine start and stop booster protects system
CN109538328A (en) * 2018-12-30 2019-03-29 江西腾勒动力有限公司 A kind of cold and hot control structure of engine motor oil
CN113847140B (en) * 2021-09-08 2023-03-03 东风汽车集团股份有限公司 Range extender lubricating and cooling system, hybrid electric vehicle and control method

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Publication number Priority date Publication date Assignee Title
US4348991A (en) * 1980-10-16 1982-09-14 Cummins Engine Company, Inc. Dual coolant engine cooling system
JPS57124029A (en) * 1981-01-23 1982-08-02 Hitachi Ltd Lubricating oil controller for exhaust gas turbo-supercharger
DE4400201A1 (en) * 1994-01-05 1995-02-02 Daimler Benz Ag Liquid-cooled internal combustion engine with lubricant cooling
DE19750814C5 (en) * 1997-11-17 2005-08-18 Modine Manufacturing Co., Racine Heat exchangers, in particular oil coolers
ES2249094B1 (en) * 2003-07-29 2007-06-01 Valeo Termico, S.A. OIL TEMPERATURE REGULATION SYSTEM FOR VEHICLES EQUIPPED WITH A LIQUID COOLING CIRCUIT AND ITS CORRESPONDING PROCEDURE.

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FR2904857A1 (en) 2008-02-15
ATE422605T1 (en) 2009-02-15
DE602007000534D1 (en) 2009-03-26
EP1892389A1 (en) 2008-02-27
FR2904857B1 (en) 2008-11-07

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