EP0953735B1 - Method for the temperature control of lubricant oil in a combustion engine - Google Patents

Method for the temperature control of lubricant oil in a combustion engine Download PDF

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Publication number
EP0953735B1
EP0953735B1 EP19990400993 EP99400993A EP0953735B1 EP 0953735 B1 EP0953735 B1 EP 0953735B1 EP 19990400993 EP19990400993 EP 19990400993 EP 99400993 A EP99400993 A EP 99400993A EP 0953735 B1 EP0953735 B1 EP 0953735B1
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EP
European Patent Office
Prior art keywords
oil
temperature
lubrication
regulating
combustion engine
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EP19990400993
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German (de)
French (fr)
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EP0953735A1 (en
Inventor
Gabriel Plassat
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Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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    • 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

Definitions

  • the invention relates to a device for regulating the temperature of the lubricating oil of the mechanical parts an internal combustion engine.
  • the invention applies especially in the automotive field.
  • An internal combustion engine generally includes a cylinder block, cylinder head and oil pan.
  • the oil is sucked into its housing by an oil pump and is distributed in the engine to ensure lubrication of mechanical parts contained in the cylinder block and in the breech.
  • the temperature of the engine lubricating oil constitutes an important parameter making it possible to decrease the friction or passive losses in the motor.
  • So lubricating oil is used for capture the calories from the cylinder head whose temperatures may exceed those of the cylinders or shirts. During normal engine operation, the oil fails calories to the coolant which ensures the thermal oil regulation. This process allows on the one hand the reduction of friction in the engine and on the other hand the use of a low viscosity oil.
  • the lubrication at the top engine is of the "mixed” type, that is to say that the parts mechanical are in metal / metal contact in places and separated by an oil film in other places; while the lubrication is of the "hydrodynamic” type in the low engine, that is, the parts are separated by an oil film.
  • An object of the present invention is to provide a oil temperature regulation process lubrication of the mechanical parts of a internal combustion overcoming all or part of the disadvantages of the prior art noted above.
  • a goal of the present invention is to provide a method of regulation the temperature of the lubricating oil minimizing the friction in the engine compared to the prior art.
  • This object is achieved by the fact that in the process of regulating the temperature of the lubricating oil mechanical parts of an internal combustion engine; the engine comprising a cylinder block, a cylinder head, a casing oil, means for sucking the oil to a first and a second lubrication circuit for mechanical components contained respectively in the cylinder block and in the cylinder head; we regulate the temperatures independently lubricating oil circulating in the first and second lubrication circuits.
  • Another object of the present invention is to provide a oil temperature regulation device lubrication of the mechanical parts of a internal combustion process implementation.
  • the regulatory device the temperature of the lubricating oil of the organs mechanics of an internal combustion engine has first and second temperature regulation means oil respectively from the first lubrication circuit and the second lubrication circuit, means for measuring the oil temperature and control means automatic temperature regulation means of the oil of the first and second lubrication circuits, as a function of the measured oil temperature.
  • first and second regulation means are each switchable by the control means between an inactive state and an active state, the active state the means of regulation being determined for provide either cooling or warming of the oil circulating in the concerned lubrication circuit.
  • the first means of oil regulation are activated to warm the oil circulating in the first circuit of lubrication, the second regulation means being either deactivated or activated to cool the oil circulating in the second lubrication circuit.
  • the reference temperature is between about 80 and 120 degrees.
  • the first means of regulation are deactivated while the second means of regulation are activated to cool the oil circulating in the second lubrication circuit.
  • the first and second regulation means are activated to cool the oil circulating respectively in the first and second lubrication circuits.
  • first and second means for regulating the oil temperature include each an exchanger and associated switching means, the exchangers being located respectively upstream of first and second lubrication circuits, the means of switching allowing to selectively or not select the oil lubrication in heat exchange with the liquid cooling of an engine cooling circuit.
  • switching means heat exchange the coolant and oil from the first lubrication circuit and deactivate heat exchange of coolant with oil of the second lubrication circuit.
  • the switching means set heat exchange the coolant and the oil second lubrication circuit and deactivate the exchange coolant temperature with the first oil lubrication circuit.
  • the switching means exchange heat the first and second coolant and oil lubrication circuits.
  • the limit temperature is between about 140 and 180 degrees.
  • maximum temperature stabilized coolant is a fixed value known by the control means, or a variable value measured in real time.
  • the cooling circuit has two branches in parallel, each of the two tracks of the same bypass comprises a valve constituting the switching means associated with the exchanger concerned.
  • Figure 1 partially and schematically an internal combustion engine which has a cylinder block 1, a cylinder head 2, an oil pan 3 and means 12 oil suction.
  • the suction means 12 can be consist of an oil pump.
  • Oil pump 12 sucks crankcase oil 3 through a strainer 13 to a first circuit 4A of lubrication of the mechanical organs contained in the cylinder housing 1 and to a second lubrication circuit 4B of the mechanical organs contained in the cylinder head 2.
  • the mechanical parts intended to be lubricated in the block cylinder 1 include, for example, the bearings of the crankshaft, the big ends as well as the contacts pistons / shirts.
  • the mechanical parts intended to be lubricated in cylinder head 2 include bearings camshaft as well as the cam / tappet contacts or cam / rocker arm.
  • the first 4A and second 4B lubrication circuits can constitute two parts of a same lubrication circuit. That is, the oil sucked by the pump 12 is shared, at a branch, between the cylinder block 1 and the cylinder head 2.
  • the engine also has a circuit 9 of cooling in which a liquid circulates cooling.
  • circuit 9 of cooling is partially represented so schematic in Figure 1.
  • the oil temperature regulation device lubrication comprises first means 5, 8A, 8B for regulating the temperature of the oil circulating in the first lubrication circuit 4A and second means 6, 7A, 7B for regulating the temperature of the oil circulating in the second lubrication circuit 4B.
  • the regulating device of the lubrication oil temperature also means 10 for measuring the temperature of lubricating oil.
  • These measuring means 10 can be consist of a probe immersed in the oil sump 3 or by any other equivalent means.
  • the device includes also means 11 for automatically controlling the means 6, 7A, 7B; 5, 8A, 8B for temperature regulation of first 4A and second 4B lubrication circuits depending on the oil temperature measured by means 10 of measured.
  • the control means 11 comprise, by example, electronic data processing means of the calculator type or any other equivalent means.
  • the first and second means for regulating the oil temperature each consist of an exchanger 5, 6 associated with means 8A, 8B; 7A, 7B respective switching.
  • These means 7A, 7B; 8A, 8B switching are intended to put or not the coolant in heat exchange with lubricating oil.
  • the exchangers 5, 6 are located upstream respectively first 4A and second 4B lubrication circuits, i.e. upstream of the cylinder block 1 and the cylinder head 2.
  • the switching means associated with each exchanger 5, 6 consist of a pair of valves 8A, 8B; 7A, 7B whether or not to allow coolant circulation in the exchanger 9. That is to say that the circuit 9 of lubrication has two parallel branches allowing whether or not to carry out, in the lubrication circuit 4A, 4B concerned, the heat exchange between the oil and the cooling.
  • Each of the two parallel paths of the same bypass comprises a valve 7A, 7B; 8A, 8B respectively. So when a first 7A, 8A valve from the valve pair 7A, 7B; 8A, 8B is open and the second valve 7B, 8B is closed, the coolant circulates in the exchanger 6, 5 concerned. When the second valve 7B, 8B is open and the first valve 7A, 8A closed, the coolant does not circulate in the exchanger 6, 5 concerned.
  • the control means 11 when the means 10 for measuring the lubricating oil temperature measure a temperature below a reference temperature Tr, the control means 11 put in heat exchange the coolant and oil from the first 4A circuit lubrication, and deactivate the heat exchange of the oil cooling of the second 4B circuit lubrication (figure 2).
  • the reference temperature Tr can be the temperature Stabilized maximum coolant ts in normal engine operation. This temperature Ts maximum stabilized coolant, which is known and / or measured for each type of engine, can be between about 80 and 120 degrees.
  • the liquid of cooling is heat exchanged with the oil in the exchanger 6 of the cylinder head lubrication circuit 4B 2, but not in the exchanger 5 of the lubrication circuit 4A of the cylinder block 1.
  • the temperature of the coolant stabilizes around a temperature, for example, about 90 degrees, while that the temperature of the lubricating oil continues to warm up well beyond 90 degrees.
  • This stabilized maximum temperature Ts of the cooling is either a fixed value known by the means 11 control, a value measured in real time.
  • the regulating device according to the invention includes means for measuring the temperature of the liquid cooling (not shown).
  • control means 11 place the means 7A, 7B; 8A, 8B switching so as to put in heat exchange the coolant and the oil first 4A and second 4B lubrication circuits.
  • the oil intended for circulate in the cylinder block 1 and in the cylinder head 2. This prevents certain mechanical components such as bearing bearings are damaged with oil too hot. Indeed, during this third phase, the coolant temperature is always stabilized around 90 degrees.
  • the device for regulating the temperature of the lubricating oil according to the invention reduced significantly the friction in the engine compared to prior art.

Description

L'invention se rapporte à un dispositif de régulation de la température de l'huile de lubrification des organes mécaniques d'un moteur à combustion interne. L'invention s'applique notamment au domaine de l'automobile.The invention relates to a device for regulating the temperature of the lubricating oil of the mechanical parts an internal combustion engine. The invention applies especially in the automotive field.

Un moteur à combustion interne comprend en général un carter cylindre, une culasse et un carter d'huile. L'huile est aspirée dans son carter par une pompe à huile et est distribuée dans le moteur pour assurer la lubrification des organes mécaniques contenus dans le carter cylindre et dans la culasse.An internal combustion engine generally includes a cylinder block, cylinder head and oil pan. The oil is sucked into its housing by an oil pump and is distributed in the engine to ensure lubrication of mechanical parts contained in the cylinder block and in the breech.

La température de l'huile de lubrification du moteur constitue un paramètre important permettant de diminuer les frottements ou pertes passives dans le moteur.The temperature of the engine lubricating oil constitutes an important parameter making it possible to decrease the friction or passive losses in the motor.

A ce titre, il est connu par le document FR 2 544 793 un procédé pour la mise en température rapide et la régulation thermique de l'huile de lubrification d'un moteur. Ce procédé consiste à ménager, au niveau des zones supérieures des cylindres ou chemises du moteur, un échange thermique entre le fluide de refroidissement du circuit de refroidissement du moteur et l'huile de lubrification. L'huile aspirée dans le carter d'huile vient en échange thermique avec le liquide de refroidissement avant d'assurer la lubrification de la culasse. Une partie de l'huile ayant circulé dans la culasse circule dans le carter cylindre avant de retourner dans le carter d'huile. Lors des démarrages à froid du moteur, l'huile est mise rapidement en température, par une circulation en boucle au moyen d'une pompe volumétrique et par échange thermique avec la culasse. Ainsi, l'huile de lubrification est utilisée pour capter les calories provenant de la culasse dont les températures peuvent dépasser celles des cylindres ou chemises. En fonctionnement normal du moteur, l'huile cède des calories au liquide de refroidissement ce qui assure la régulation thermique de l'huile. Ce procédé permet d'une part la diminution des frottements dans le moteur et d'autre part l'utilisation d'une huile de faible viscosité. As such, it is known from document FR 2 544 793 a process for rapid warm-up and regulation of the engine lubricating oil. This process consists in sparing, at the level of the upper zones of the engine cylinders or liners, a heat exchange between the coolant in the cooling circuit of the engine and lubricating oil. Oil drawn into the sump of oil comes in heat exchange with the liquid of cooling before lubricating the cylinder head. Part of the oil that has circulated in the cylinder head circulates in the cylinder block before returning to the oil pan. When the engine is started cold, the oil is put rapidly in temperature, by loop circulation at by means of a positive displacement pump and by heat exchange with the breech. So lubricating oil is used for capture the calories from the cylinder head whose temperatures may exceed those of the cylinders or shirts. During normal engine operation, the oil fails calories to the coolant which ensures the thermal oil regulation. This process allows on the one hand the reduction of friction in the engine and on the other hand the use of a low viscosity oil.

Cependant, on constate que malgré le procédé du document FR 2 544 793, les frottements restent importants dans le moteur.However, we note that despite the process of document FR 2 544 793, friction remains high in the engine.

Par ailleurs, on sait que la lubrification dans le haut moteur est du type "mixte", c'est-à-dire que les pièces mécaniques sont en contact métal/métal par endroits et séparés par un film d'huile à d'autres endroits; tandis que la lubrification est du type "hydrodynamique" dans le bas moteur, c'est-à-dire que les pièces sont séparées par un film d'huile.Furthermore, we know that the lubrication at the top engine is of the "mixed" type, that is to say that the parts mechanical are in metal / metal contact in places and separated by an oil film in other places; while the lubrication is of the "hydrodynamic" type in the low engine, that is, the parts are separated by an oil film.

De plus, des essais réalisés par la demanderesse ont révélé d'une part que les frottements dans le haut moteur (culasse) décroissent lorsque le nombre de Sommerfeld S=µN/P croít (µ étant la viscosité dynamique de l'huile exprimée en Pa.s, N le régime en tours/min. et P la charge en N), et d'autre part que les frottements croissent dans le bas moteur (bloc cylindre) lorsque le nombre de Sommerfeld croít. Ainsi, à régime et charge constants, pour diminuer les frottements dans le haut moteur il faut diminuer la température de l'huile, et pour diminuer les frottements dans le bas moteur il faut augmenter la température de l'huile.In addition, tests carried out by the applicant have revealed on the one hand that the friction in the high engine (cylinder head) decrease when the Sommerfeld number S = µN / P increases (µ being the dynamic viscosity of the oil expressed in Pa.s, N the speed in revolutions / min. and P the load in N), and on the other hand that the friction increases at the bottom engine (cylinder block) when the Sommerfeld number increases. Thus, at constant speed and load, to reduce the friction in the upper engine, the temperature must be reduced oil, and to reduce friction in the lower engine the oil temperature must be increased.

Un but de la présente invention est de proposer un procédé de régulation de la température de l'huile de lubrification des organes mécaniques d'un moteur à combustion interne palliant tout ou partie des inconvénients de l'art antérieur relevés ci-dessus. En particulier, un but de la présente invention est de proposer un procédé de régulation de la température de l'huile de lubrification minimisant les frottements dans le moteur par rapport à l'art antérieur.An object of the present invention is to provide a oil temperature regulation process lubrication of the mechanical parts of a internal combustion overcoming all or part of the disadvantages of the prior art noted above. In particular, a goal of the present invention is to provide a method of regulation the temperature of the lubricating oil minimizing the friction in the engine compared to the prior art.

Ce but est atteint par le fait que dans le procédé de régulation de la température de l'huile de lubrification des organes mécaniques d'un moteur à combustion interne; le moteur comportant un bloc cylindre, une culasse, un carter d'huile, des moyens d'aspiration de l'huile vers un premier et un second circuit de lubrification des organes mécaniques contenus respectivement dans le carter cylindre et dans la culasse; on régule de manière indépendante les températures de l'huile de lubrification circulant dans les premier et second circuits de lubrification.This object is achieved by the fact that in the process of regulating the temperature of the lubricating oil mechanical parts of an internal combustion engine; the engine comprising a cylinder block, a cylinder head, a casing oil, means for sucking the oil to a first and a second lubrication circuit for mechanical components contained respectively in the cylinder block and in the cylinder head; we regulate the temperatures independently lubricating oil circulating in the first and second lubrication circuits.

Un autre but de la présente invention est de proposer un dispositif de régulation de la température de l'huile de lubrification des organes mécaniques d'un moteur à combustion interne de mise en oeuvre du procédé.Another object of the present invention is to provide a oil temperature regulation device lubrication of the mechanical parts of a internal combustion process implementation.

Ce but est atteint par le fait que le dispositif de régulation de la température de l'huile de lubrification des organes mécaniques d'un moteur à combustion interne comporte des premiers et seconds moyens de régulation de la température de l'huile respectivement, du premier circuit de lubrification et du second circuit de lubrification, des moyens de mesure de la température de l'huile et des moyens de commande automatiques des moyens de régulation de la température de l'huile des premier et second circuits de lubrification, en fonction de la température mesurée de l'huile.This goal is achieved by the fact that the regulatory device the temperature of the lubricating oil of the organs mechanics of an internal combustion engine has first and second temperature regulation means oil respectively from the first lubrication circuit and the second lubrication circuit, means for measuring the oil temperature and control means automatic temperature regulation means of the oil of the first and second lubrication circuits, as a function of the measured oil temperature.

Selon une autre particularité les premiers et seconds moyens de régulation sont chacun commutables par les moyens de commande entre un état inactif et un état actif, l'état actif les moyens de régulation étant déterminé pour assurer soit un refroidissement soit un réchauffement de l'huile circulant dans le circuit de lubrification concerné.According to another feature the first and second regulation means are each switchable by the control means between an inactive state and an active state, the active state the means of regulation being determined for provide either cooling or warming of the oil circulating in the concerned lubrication circuit.

Selon une autre particularité lorsque la température de l'huile est inférieure à une température de référence, les premiers moyens de régulation de l'huile sont activés pour réchauffer l'huile circulant dans le premier circuit de lubrification, les seconds moyens de régulation étant soit désactivés soit activés pour refroidir l'huile circulant dans le second circuit de lubrification.According to another particular feature when the temperature of the oil is below a reference temperature, the first means of oil regulation are activated to warm the oil circulating in the first circuit of lubrication, the second regulation means being either deactivated or activated to cool the oil circulating in the second lubrication circuit.

Selon une autre particularité la température de référence est comprise entre 80 et 120 degrés environ.According to another particular feature, the reference temperature is between about 80 and 120 degrees.

Selon une autre particularité lorsque la température de l'huile de lubrification est comprise entre la température de référence et une température limite, les premiers moyens de régulation sont désactivés tandis que les seconds moyens de régulation sont activés pour refroidir l'huile circulant dans le second circuit de lubrification.According to another particular feature when the temperature of the lubricating oil is between the temperature of reference and a limit temperature, the first means of regulation are deactivated while the second means of regulation are activated to cool the oil circulating in the second lubrication circuit.

Selon une autre particularité lorsque la température de l'huile de lubrification est supérieure à une température limite, les premiers et seconds moyens de régulation sont activés pour refroidir l'huile circulant respectivement dans les premiers et second circuit de lubrification.According to another particular feature when the temperature of the lubricating oil is higher than a limit temperature, the first and second regulation means are activated to cool the oil circulating respectively in the first and second lubrication circuits.

Selon une autre particularité les premiers et seconds moyens de régulation de la température de l'huile comportent chacun un échangeur et des moyens de commutation associés, les échangeurs étant situés en amont respectivement des premiers et seconds circuits de lubrification, les moyens de commutation permettant de mettre sélectivement ou non l'huile de lubrification en échange thermique avec le liquide de refroidissement d'un circuit de refroidissement du moteur.According to another feature the first and second means for regulating the oil temperature include each an exchanger and associated switching means, the exchangers being located respectively upstream of first and second lubrication circuits, the means of switching allowing to selectively or not select the oil lubrication in heat exchange with the liquid cooling of an engine cooling circuit.

Selon une autre particularité lorsque la température de l'huile de lubrification est inférieure à la température maximale stabilisée du liquide de refroidissement en lors du fonctionnement normal du moteur, les moyens de commutation mettent en échange thermique le liquide de refroidissement et l'huile du premier circuit de lubrification et désactivent l'échange thermique du liquide de refroidissement avec l'huile du second circuit de lubrification.According to another particular feature when the temperature of the lubricating oil is below the maximum temperature stabilized coolant when normal engine operation, switching means heat exchange the coolant and oil from the first lubrication circuit and deactivate heat exchange of coolant with oil of the second lubrication circuit.

Selon une autre particularité lorsque la température de l'huile de lubrification est comprise entre la température maximale stabilisée du liquide de refroidissement et une température limite, les moyens de commutation mettent en échange thermique le liquide de refroidissement et l'huile du second circuit de lubrification et désactivent l'échange thermique du liquide de refroidissement avec l'huile du premier circuit de lubrification. According to another particular feature when the temperature of the lubricating oil is between the temperature maximum stabilized coolant and a limit temperature, the switching means set heat exchange the coolant and the oil second lubrication circuit and deactivate the exchange coolant temperature with the first oil lubrication circuit.

Selon une autre particularité lorsque la température de l'huile de lubrification est supérieure à une température limite, les moyens de commutation mettent en échange thermique le liquide de refroidissement et l'huile des premier et second circuits de lubrification.According to another particular feature when the temperature of the lubricating oil is higher than a limit temperature, the switching means exchange heat the first and second coolant and oil lubrication circuits.

Selon une autre particularité la température limite est comprise entre 140 et 180 degrés environ.According to another particular feature, the limit temperature is between about 140 and 180 degrees.

Selon une autre particularité température maximale stabilisée du liquide de refroidissement est une valeur fixe connue par les moyens de commande, ou une valeur variable mesurée en temps réel.According to another particularity maximum temperature stabilized coolant is a fixed value known by the control means, or a variable value measured in real time.

Selon une autre particularité le circuit de refroidissement comporte deux dérivations en parallèle, chacune des deux voies d'une même dérivation comporte une vanne constituant les moyens de commutation associés à l'échangeur concerné.According to another particular feature the cooling circuit has two branches in parallel, each of the two tracks of the same bypass comprises a valve constituting the switching means associated with the exchanger concerned.

D'autres caractéristiques et avantages de l'invention apparaítront à la lecture de la description détaillée qui va suivre, pour la compréhension de laquelle on se reportera aux dessins annexés, dans lesquels :

  • la figure 1 représente une vue en perspective, schématique et partielle, d'un moteur pourvu d'un dispositif de régulation de la température de l'huile de lubrification selon l'invention,
  • la figure 2 représente schématiquement le principe de fonctionnement du dispositif de régulation de la température de l'huile de lubrification de la figure 1.
Other characteristics and advantages of the invention will appear on reading the detailed description which follows, for the understanding of which reference will be made to the appended drawings, in which:
  • FIG. 1 represents a schematic and partial perspective view of an engine provided with a device for regulating the temperature of the lubricating oil according to the invention,
  • FIG. 2 schematically represents the operating principle of the device for regulating the temperature of the lubricating oil of FIG. 1.

L'invention va à présent être décrite en référence aux figures 1 et 2.The invention will now be described with reference to Figures 1 and 2.

La figure 1 représente partiellement et schématiquement un moteur à combustion interne qui comporte un bloc cylindre 1, une culasse 2, un carter d'huile 3 et des moyens 12 d'aspiration de l'huile. Les moyens 12 d'aspiration peuvent être constitués d'une pompe à huile. La pompe 12 à huile aspire l'huile du carter 3 par une crépine 13 vers un premier circuit 4A de lubrification des organes mécaniques contenus dans le carter cylindre 1 et vers un second circuit 4B de lubrification des organes mécaniques contenus dans la culasse 2. Les organes mécaniques destinés à être lubrifiés dans le bloc cylindre 1 comprennent, par exemple, les paliers du vilebrequin, les têtes de bielles ainsi que les contacts pistons/chemises. Les organes mécaniques destinés à être lubrifiés dans la culasse 2 comprennent quant à eux les paliers d'arbre à cames ainsi que les contacts came/poussoir ou came/culbuteur.Figure 1 partially and schematically an internal combustion engine which has a cylinder block 1, a cylinder head 2, an oil pan 3 and means 12 oil suction. The suction means 12 can be consist of an oil pump. Oil pump 12 sucks crankcase oil 3 through a strainer 13 to a first circuit 4A of lubrication of the mechanical organs contained in the cylinder housing 1 and to a second lubrication circuit 4B of the mechanical organs contained in the cylinder head 2. The mechanical parts intended to be lubricated in the block cylinder 1 include, for example, the bearings of the crankshaft, the big ends as well as the contacts pistons / shirts. The mechanical parts intended to be lubricated in cylinder head 2 include bearings camshaft as well as the cam / tappet contacts or cam / rocker arm.

Comme représenté à la figure 1, les premier 4A et second 4B circuits de lubrification peuvent constituer deux parties d'un même circuit de lubrification. C'est-à-dire que l'huile aspirée par la pompe 12 se partage, au niveau d'une dérivation, entre le carter cylindre 1 et la culasse 2.As shown in Figure 1, the first 4A and second 4B lubrication circuits can constitute two parts of a same lubrication circuit. That is, the oil sucked by the pump 12 is shared, at a branch, between the cylinder block 1 and the cylinder head 2.

Le moteur comporte également un circuit 9 de refroidissement dans lequel circule un liquide de refroidissement. Par soucis de simplification, le circuit 9 de refroidissement est représenté partiellement de manière schématique à la figure 1.The engine also has a circuit 9 of cooling in which a liquid circulates cooling. For the sake of simplification, circuit 9 of cooling is partially represented so schematic in Figure 1.

Le dispositif de régulation de la température de l'huile de lubrification selon l'invention comporte des premiers moyens 5, 8A, 8B de régulation de la température de l'huile circulant dans le premier circuit 4A de lubrification et des seconds moyens 6, 7A, 7B de régulation de la température de l'huile circulant dans le second circuit 4B de lubrification.The oil temperature regulation device lubrication according to the invention comprises first means 5, 8A, 8B for regulating the temperature of the oil circulating in the first lubrication circuit 4A and second means 6, 7A, 7B for regulating the temperature of the oil circulating in the second lubrication circuit 4B.

Comme représenté à la figure 2, le dispositif de régulation de la température de l'huile de lubrification comporte également des moyens 10 de mesure de la température de l'huile de lubrification. Ces moyens 10 de mesure peuvent être constitués d'une sonde plongeant dans le carter d'huile 3 ou de tout autre moyen équivalent. Le dispositif comporte également des moyens 11 de commande automatiques des moyens 6, 7A, 7B; 5, 8A, 8B de régulation en température des premier 4A et second 4B circuits de lubrification en fonction de la température de l'huile mesurée par les moyens 10 de mesure. Les moyens 11 de commande comportent, par exemple, des moyens électroniques de traitement de données du type calculateur ou tout autre moyen équivalent.As shown in Figure 2, the regulating device of the lubrication oil temperature also means 10 for measuring the temperature of lubricating oil. These measuring means 10 can be consist of a probe immersed in the oil sump 3 or by any other equivalent means. The device includes also means 11 for automatically controlling the means 6, 7A, 7B; 5, 8A, 8B for temperature regulation of first 4A and second 4B lubrication circuits depending on the oil temperature measured by means 10 of measured. The control means 11 comprise, by example, electronic data processing means of the calculator type or any other equivalent means.

Dans l'exemple représenté à la figure 1, les premiers et seconds moyens de régulation de la température de l'huile sont constitués chacun d'un échangeur 5, 6 associé à des moyens 8A, 8B; 7A, 7B de commutation respectifs. Ces moyens 7A, 7B; 8A, 8B de commutation sont destinés à mettre ou non le liquide de refroidissement en échange thermique avec l'huile de lubrification.In the example shown in Figure 1, the first and second means for regulating the oil temperature each consist of an exchanger 5, 6 associated with means 8A, 8B; 7A, 7B respective switching. These means 7A, 7B; 8A, 8B switching are intended to put or not the coolant in heat exchange with lubricating oil.

Les échangeurs 5, 6 sont situés en amont respectivement des premier 4A et second 4B circuits de lubrification, c'est-à-dire en amont respectivement du carter cylindre 1 et de la culasse 2.The exchangers 5, 6 are located upstream respectively first 4A and second 4B lubrication circuits, i.e. upstream of the cylinder block 1 and the cylinder head 2.

Les moyens de commutation associés à chaque échangeur 5, 6 sont constitués d'une paire de vannes 8A, 8B; 7A, 7B autorisant ou non la circulation du liquide de refroidissement dans l'échangeur 9. C'est-à-dire que le circuit 9 de lubrification comporte deux dérivations en parallèle permettant de réaliser ou non, dans le circuit de lubrification 4A, 4B concerné, l'échange thermique entre l'huile et le liquide de refroidissement.The switching means associated with each exchanger 5, 6 consist of a pair of valves 8A, 8B; 7A, 7B whether or not to allow coolant circulation in the exchanger 9. That is to say that the circuit 9 of lubrication has two parallel branches allowing whether or not to carry out, in the lubrication circuit 4A, 4B concerned, the heat exchange between the oil and the cooling.

Chacun des deux chemins parallèles d'une même dérivation comporte une vanne 7A, 7B; 8A, 8B respective. Ainsi, lorsqu'une première 7A, 8A vanne de la paire de vanne 7A, 7B; 8A, 8B est ouverte et la seconde vanne 7B, 8B est fermée, le liquide de refroidissement circule dans l'échangeur 6, 5 concerné. Lorsque la seconde vanne 7B, 8B est ouverte et la première vanne 7A, 8A fermée, le liquide de refroidissement ne circule pas dans l'échangeur 6, 5 concerné. Each of the two parallel paths of the same bypass comprises a valve 7A, 7B; 8A, 8B respectively. So when a first 7A, 8A valve from the valve pair 7A, 7B; 8A, 8B is open and the second valve 7B, 8B is closed, the coolant circulates in the exchanger 6, 5 concerned. When the second valve 7B, 8B is open and the first valve 7A, 8A closed, the coolant does not circulate in the exchanger 6, 5 concerned.

Selon l'invention, lorsque les moyens 10 de mesure de la température de l'huile de lubrification mesurent une température inférieure à une température de référence Tr, les moyens 11 de commande mettent en échange thermique le liquide de refroidissement et l'huile du premier 4A circuit de lubrification, et désactivent l'échange thermique du liquide de refroidissement avec l'huile du second 4B circuit de lubrification (figure 2). Dans l'exemple non limitatif décrit ci-après, la température de référence Tr peut être la température Ts maximale stabilisée du liquide de refroidissement en fonctionnement normal du moteur. Cette température Ts maximale stabilisée du liquide de refroidissement, qui est connue et/ou mesurée pour chaque type de moteur, peut être comprise entre 80 et 120 degrés environ. C'est-à-dire que lorsque la température de l'huile est inférieure une température Ts égale, par exemple, à 90 environ, le liquide de refroidissement est mis en échange thermique avec l'huile dans l'échangeur du circuit 4A de lubrification du carter cylindre 1, mais pas dans l'échangeur 6 du circuit 4B de lubrification de la culasse 2.According to the invention, when the means 10 for measuring the lubricating oil temperature measure a temperature below a reference temperature Tr, the control means 11 put in heat exchange the coolant and oil from the first 4A circuit lubrication, and deactivate the heat exchange of the oil cooling of the second 4B circuit lubrication (figure 2). In the nonlimiting example described below, the reference temperature Tr can be the temperature Stabilized maximum coolant ts in normal engine operation. This temperature Ts maximum stabilized coolant, which is known and / or measured for each type of engine, can be between about 80 and 120 degrees. Which means when the oil temperature is lower one temperature Ts equal, for example, to approximately 90, the cooling is heat exchanged with the oil in the exchanger of the crankcase lubrication circuit 4A cylinder 1, but not in exchanger 6 of circuit 4B of lubrication of the cylinder head 2.

De cette façon, on accélère le réchauffement de l'huile de lubrification des organes mécaniques du carter cylindre 1 sans accélérer le réchauffement de l'huile de lubrification des organes mécaniques de la culasse 2. En effet, dans cette première phase qui suit le démarrage à froid du moteur, on a constaté que la température du liquide de refroidissement augmente plus vite que celle de l'huile de lubrification.In this way, the heating of the oil is accelerated. lubrication of the mechanical components of the cylinder block 1 without accelerate the heating of the lubricating oil mechanical components of the cylinder head 2. Indeed, in this first phase following the cold start of the engine, we have found that the coolant temperature increases faster than that of lubricating oil.

Lorsque la température de l'huile de lubrification est comprise entre la température Ts maximale stabilisée du liquide de refroidissement et une température limite Tmax comprise entre 140 et 180 degrés environ, les moyens 7A, 7B; 8A, 8B de commutation mettent en échange thermique le liquide de refroidissement et l'huile du second 4B circuit de lubrification et désactivent l'échange thermique de l'eau avec l'huile du premier (4A) circuit de lubrification, pour ne pas refroidir cette dernière. When the temperature of the lubricating oil is between the stabilized maximum temperature Ts of the coolant and a limit temperature Tmax between about 140 and 180 degrees, the means 7A, 7B; 8A, 8B switching switch the heat exchange coolant and oil from the second 4B circuit lubrication and deactivate heat exchange of water with oil from the first (4A) lubrication circuit, so as not to cool the latter.

C'est-à-dire que lorsque la température de l'huile est comprise entre la température Ts maximale stabilisée du liquide de refroidissement et une température limite Tmax égale de préférence à 155 degrés environ, le liquide de refroidissement est mis en échange thermique avec l'huile dans l'échangeur 6 du circuit 4B de lubrification de la culasse 2, mais pas dans l'échangeur 5 du circuit 4A de lubrification du carter cylindre 1.That is, when the oil temperature is between the stabilized maximum temperature Ts of the coolant and a limit temperature Tmax preferably equal to about 155 degrees, the liquid of cooling is heat exchanged with the oil in the exchanger 6 of the cylinder head lubrication circuit 4B 2, but not in the exchanger 5 of the lubrication circuit 4A of the cylinder block 1.

De cette manière, on refroidit l'huile qui circule dans la culasse 2, mais pas l'huile destinée à lubrifier le bloc cylindre 1. En effet, dans cette deuxième phase, la température du liquide de refroidissement se stabilise autour d'une température égale, par exemple, à 90 degrés environ, tandis que la température de l'huile de lubrification continue de s'échauffer bien au-delà de 90 degrés.In this way, the oil circulating in the cylinder head 2, but not the oil intended to lubricate the cylinder block 1. Indeed, in this second phase, the temperature of the coolant stabilizes around a temperature, for example, about 90 degrees, while that the temperature of the lubricating oil continues to warm up well beyond 90 degrees.

Cette température Ts maximale stabilisée du liquide de refroidissement est soit une valeur fixe connue par les moyens 11 de commande, soit une valeur mesurée en temps réel. Dans ce derniers cas, le dispositif de régulation selon l'invention comporte des moyens de mesure de la température du liquide de refroidissement (non représentés).This stabilized maximum temperature Ts of the cooling is either a fixed value known by the means 11 control, a value measured in real time. In in the latter case, the regulating device according to the invention includes means for measuring the temperature of the liquid cooling (not shown).

Enfin, lorsque la température de l'huile de lubrification est supérieure à une température limite Tmax comprise entre 140 et 180 degrés environ, les moyens 11 de commande placent les moyens 7A, 7B; 8A, 8B de commutation de façon à mettre en échange thermique le liquide de refroidissement et l'huile des premier 4A et second 4B circuits de lubrification.Finally, when the temperature of the lubricating oil is higher than a limit temperature Tmax between 140 and approximately 180 degrees, the control means 11 place the means 7A, 7B; 8A, 8B switching so as to put in heat exchange the coolant and the oil first 4A and second 4B lubrication circuits.

Ainsi, on effectue un refroidissement de l'huile destinée à circuler dans le carter cylindre 1 et dans la culasse 2. Ceci permet d'éviter que certains organes mécaniques tels que des coussinets des paliers ne soient endommagés avec une huile trop chaude. En effet, durant cette troisième phase, la température du liquide de refroidissement est toujours stabilisée autour de 90 degrés. Thus, the oil intended for circulate in the cylinder block 1 and in the cylinder head 2. This prevents certain mechanical components such as bearing bearings are damaged with oil too hot. Indeed, during this third phase, the coolant temperature is always stabilized around 90 degrees.

On constate que le dispositif de régulation de la température de l'huile de lubrification selon l'invention réduit significativement les frottements dans le moteur par rapport à l'art antérieur.It can be seen that the device for regulating the temperature of the lubricating oil according to the invention reduced significantly the friction in the engine compared to prior art.

Cette diminution des pertes passives dans le moteur peut s'expliquer notamment par le fait que les températures de l'huile dans le haut et dans le bas moteur régulées selon l'invention sont mieux adaptées aux modes de lubrifications des organes mécaniques lubrifiés.This reduction in passive losses in the motor can can be explained in particular by the fact that the temperatures of the oil in the top and in the bottom engine regulated according to the invention are better suited to the modes of lubrication lubricated mechanical parts.

Bien que l'invention ait été décrite en liaison avec des modes de réalisation particuliers, elle comprend tous les équivalents techniques des moyens décrits.Although the invention has been described in connection with particular embodiments, it includes all technical equivalents of the means described.

Claims (14)

  1. Method for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine, the engine comprising a cylinder block (1), a cylinder head (2), an oil sump (3), means (12) for drawing oil towards a first (4A) and a second (4B) lubrication system for the mechanical bodies contained in the cylinder casing (1) and the cylinder head (2) respectively, characterised in that it consists in independently regulating the temperatures of the lubrication oil circulating in the first (4A) and second (4B) lubrication systems.
  2. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine, the engine comprising a cylinder block (1), a cylinder head (2), an oil sump (3), means (12) for drawing oil towards a first (4A) and a second (4B) lubrication system for the mechanical bodies contained in the cylinder casing (1) and the cylinder head respectively, implementing the method according to Claim 1, characterised in that it comprises first (5, 8A, 8B) and second (6, 7A, 7B) regulation means independently regulating the oil temperatures of the first lubrication system (4A) and the second lubrication system (4B) respectively, means (10) for measuring the oil temperature and automatic control means (11) for the means (5, 8A, 8B; 6 7A, 7B) of regulating the oil temperature of the first (4A) and second (4B) lubrication systems, as a function of the measured temperature of the oil.
  3. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to Claim 2, characterised in that first (5, 8A, 8B) and second (6, 7A, 7B) regulation means are each switchable by the control means (11) between an inactive state and an active state, the active state the regulation means (5, 8A, 8B, 6, 7A, 7B) being determined so as to ensure either cooling or heating of the oil circulating in the lubrication system (4A, 4B) concerned.
  4. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to Claim 2 or 3 characterised in that when the oil temperature is lower than a reference temperature (Tr), the first oil regulation means (5) are activated so as to heat the oil circulating in the first lubrication system (4A), the second regulation means (6) either being deactivated or activated so as to cool the oil circulating in the second (4B) lubrication system.
  5. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to Claim 4 characterised in that the reference temperature (Tr) is between 80 and 120 degrees approximately.
  6. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to any one of Claims 2 to 5 characterised in that when the temperature of the lubrication oil is between the reference temperature (Tr) and a limiting temperature (Tmax), the first regulation means (5) are deactivated while the second regulation means (6) are activated so as to cool the oil circulating in the second lubrication system (4A).
  7. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to any one of Claims 2 to 6 characterised in that when the temperature of the lubrication oil is greater than a limiting temperature (Tmax), the first (5) and second (6) regulation means are activated so as to cool the oil circulating in the first (4A) and second (4A) lubrication systems respectively.
  8. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to Claim 2 characterised in that the first and second means for regulating the oil temperature each comprise an exchanger (5, 6) and associated switching means (7A, 7B; 8A, 8B), the exchangers (5, 6) being located upstream of the first (4A) and second (4B) lubrication systems respectively, the switching means (7A, 7B; 8A, 8B) making it possible to selectively put or not put the lubrication oil into heat exchange with the coolant of a cooling system (9) for the engine.
  9. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to Claim 8 characterised in that when the temperature of the lubrication oil is lower than the stabilised maximum temperature (Ts) of the coolant during the normal operation of the engine, the switching means (7A, 7B; 8A, 8B) put into heat exchange the coolant and the oil of the first (4A) lubrication system and deactivate the heat exchange of the coolant with the oil of the second (4b) lubrication system.
  10. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to Claim 9 characterised in that when the temperature of the lubrication oil is between the stabilised maximum temperature (Ts) of the coolant and a limiting temperature (Tmax), the switching means (7A, 7B; 8A, 8B) put into heat exchange the coolant and the oil of the second (4B) lubrication system and deactivate the heat exchange of the coolant with the oil of the first (4A) lubrication system.
  11. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to Claim 10 characterised in that when the temperature of the lubrication oil is higher than a limiting temperature (Tmax), the switching means (7A, 7B; 8A, 8B) put into heat exchange the coolant and the oil of the first (4A) and second (4B) lubrication systems.
  12. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to any one of Claims 6, 7, 10 and 11, characterised in that the limiting temperature (Tmax) is between 140 and 180 degrees approximately.
  13. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to any one of Claims 9 to 11 characterised in that the stabilised maximum temperature (Ts) of the coolant is a fixed value known by the control means (11), or a variable value measured in real time.
  14. Device for regulating the temperature of the lubrication oil for the mechanical bodies of an internal combustion engine according to any one of Claims 8, 9, 10, 11 and 13, characterised in that the cooling system (9) comprises two parallel branches, each of the two channels of the same branch comprising a valve (7A, 7B, 8A, 8B) constituting the switching means associated with the exchanger (5, 6) concerned.
EP19990400993 1998-04-30 1999-04-23 Method for the temperature control of lubricant oil in a combustion engine Expired - Lifetime EP0953735B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9805462A FR2778204B1 (en) 1998-04-30 1998-04-30 METHOD FOR REGULATING THE TEMPERATURE OF THE MECHANICAL LUBRICATING OIL OF AN INTERNAL COMBUSTION ENGINE
FR9805462 1998-04-30

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EP0953735A1 EP0953735A1 (en) 1999-11-03
EP0953735B1 true EP0953735B1 (en) 2003-05-21

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DE102006019086B4 (en) * 2006-04-23 2020-03-26 Att Automotivethermotech Gmbh Method and device for active oil temperature control in motor vehicles with internal combustion engines
DE102008018322A1 (en) * 2008-04-11 2009-10-15 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Combustion engine controlling method, involves detecting temperature of engine oil, initiating measure for increase of oil pressure and detecting measure for reducing oil temperature

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Publication number Priority date Publication date Assignee Title
FR2128899A5 (en) * 1971-03-08 1972-10-27 Semt
US4248293A (en) * 1979-01-16 1981-02-03 Honda Giken Kogyo Kabushiki Kaisha Apparatus for cooling engine oil
ATE4340T1 (en) * 1979-09-28 1983-08-15 Caterpillar Tractor Co. FLUID FOLLOWING CIRCULATOR.
US4512300A (en) * 1984-04-17 1985-04-23 Cummins Engine Company, Inc. Oil temperature control system for internal combustion engine
FR2605677B1 (en) * 1986-10-24 1990-09-14 Renault LUBRICATION DEVICE FOR INTERNAL COMBUSTION ENGINE
DE3843827A1 (en) * 1988-12-24 1990-07-05 Kloeckner Humboldt Deutz Ag INTERNAL COMBUSTION ENGINE WITH TWO HYDRAULIC LIQUID CIRCUITS
JPH04111505U (en) * 1991-03-15 1992-09-28 本田技研工業株式会社 Refueling system in internal combustion engines
DE4325141A1 (en) * 1993-07-27 1995-02-02 Kloeckner Humboldt Deutz Ag Internal combustion engine
EP0775813B1 (en) * 1995-11-24 2003-03-05 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine

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EP0953735A1 (en) 1999-11-03
DE69908018T2 (en) 2004-04-01
FR2778204A1 (en) 1999-11-05
DE69908018D1 (en) 2003-06-26

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