EP3236041A1 - Kühlsystem eines wärmekraftmotors - Google Patents

Kühlsystem eines wärmekraftmotors Download PDF

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Publication number
EP3236041A1
EP3236041A1 EP17167131.6A EP17167131A EP3236041A1 EP 3236041 A1 EP3236041 A1 EP 3236041A1 EP 17167131 A EP17167131 A EP 17167131A EP 3236041 A1 EP3236041 A1 EP 3236041A1
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EP
European Patent Office
Prior art keywords
circuit
fluid
engine
coolant
circuits
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17167131.6A
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English (en)
French (fr)
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EP3236041B1 (de
Inventor
Stéphane Ruby
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
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Renault SAS
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Publication of EP3236041A1 publication Critical patent/EP3236041A1/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F01P2003/027—Cooling cylinders and cylinder heads in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves

Definitions

  • the present invention relates to a cooling system of a heat engine and a method of operating such a system.
  • the invention also relates to a heat engine comprising such a cooling system and a vehicle including a motor vehicle comprising such a motor.
  • a heat engine usually comprises a cylinder block closed by a cylinder head cover. For proper operation of the engine, these housings must be cooled. To do this, the engine is provided with a cooling system in which a coolant is circulated by means of a feed pump and which, in turn, is cooled through a radiator.
  • the operating temperature of an engine is normally much higher than the outside temperature, especially in cold weather. Any startup of the latter is therefore accompanied by a preheating phase during which the performance is not optimal, especially during which the emissions of pollutants of carbon monoxide and unburnt hydrocarbons are much larger than nominal .
  • a motor 100 is known in the state of the art provided with a so-called double cooling cooling system 101, otherwise known as the Anglo-Saxon "split-cooling" system, in which the coolant circulates independently in first and second fluid circuits 104a, 104b respectively of the cylinder housing 103a and the cylinder head housing 103b, the circulation in the first fluid circuit 104a being established once the preheating phase completed from an activation of a valve 108 arranged at the output of this first circuit 104a.
  • double cooling cooling system 101 otherwise known as the Anglo-Saxon "split-cooling" system
  • Such a system 101 makes it possible to minimize the heating time of the engine 100 or of a part thereof, by accelerating the rise in temperature of the coolant at the start of the vehicle, in order to reduce piston friction. and segments in engine drums 100, fuel consumption and pollutant emissions.
  • the engine 100 generally comprises a cylinder head gasket 105 provided with orifices for the circulation of heat transfer fluid between the first and second circuits 104a, 104b and this, in order to facilitate degassing mechanisms in this system.
  • the presence of such holes in the cylinder head gasket 105 then impedes the proper functioning and effectiveness of the double cooling, since a residual parasitic flow rate 106a of heat transfer fluid is present between these two circuits 104a, 104b.
  • the passage of the heat transfer fluid from the first circuit 104a to the second circuit 104b through these orifices results from a pressure difference of the fluid in the first and second circuits 104a, 104b, and to a thermosiphon effect between the circuits 104a and 104b, because the fluids in these two circuits are at different temperatures.
  • the pressure of the fluid in the first circuit 104a is greater than the pressure of this fluid in the second circuit 104b due to the introduction of fluid by the feed pump 107 at the inlet of this first circuit 104a and the presence of the valve 108 which is closed at the output of this first circuit 104a.
  • the parasitic flow 106a has the consequence that a temperature T2 of the fluid in the first circuit 104a evolves more rapidly than a fluid temperature T3 in the same circuit of a system in which there is no double cooling and more slowly that a temperature T1 of the fluid in a first circuit of a double cooling system in which such a parasitic flow 106a is non-existent. Therefore, the first circuit 104a defined in the cylinder housing 103a therefore no longer operates completely in "zero flow", which reduces the temperature T2 of the cylinder block at the expense of fuel consumption and pollutant emissions.
  • the first circuit 104a defined in the cylinder housing 103a comprises a valve 108 arranged at the inlet of this first circuit 104a and this, after the feed pump 107 of the system 101.
  • this valve 108 at the entrance of the first circuit 104a does not completely eliminate the parasitic flow 106a.
  • this arrangement also generates a parasitic circulation 106b of heat transfer fluid in a loop between these two circuits 104a, 104b in a direction illustrated by the arrow F present on the figure 2 , thus not allowing the cooling system to perform dual cooling operation which is fully effective.
  • the present invention aims to overcome these disadvantages related to the state of the art.
  • the invention relates to a cooling system, in particular of the double-cooling type, of a combustion engine of a motor vehicle comprising first and second heat transfer fluid circuits respectively arranged in a cylinder block and a crankcase.
  • the cylinder head of said engine, the first circuit being provided with first and second fluid flow control elements respectively arranged at an input and an output of said first circuit.
  • the invention also relates to a method of operating a cooling system of a thermal engine of a motor vehicle comprising first and second heat transfer fluid circuits respectively arranged in a cylinder head housing and a crankcase of said engine, the method comprising a step of controlling the flow of the coolant in the first circuit from first and second fluid flow control elements.
  • the invention also relates to a heat engine comprising such a cooling system.
  • the invention also relates to a motor vehicle comprising this heat engine.
  • the figure 4 is a schematic representation of a cooling system 2 of a heat engine 1 of a motor vehicle.
  • This engine 1 can be a gasoline engine or a diesel engine including supercharged or a motor operating according to a technology called "Flex Fuel” and whose fuel system and carburetion allows it to use indifferently fuels as varied as the gasoline, bioethanol or a mixture of both.
  • the cooling system 2 is implemented in a diesel engine 1 comprising a main circuit 3 provided with components of the engine 1 such as a degassing jar 18, a supercharging module engine 1 comprising a turbocharger 20, a heat exchanger 21 such as a heater or a motor oil exchanger 19 better known by the acronym "EMO" for evacuating heat generated at the oil sump engine.
  • a diesel engine 1 comprising a main circuit 3 provided with components of the engine 1 such as a degassing jar 18, a supercharging module engine 1 comprising a turbocharger 20, a heat exchanger 21 such as a heater or a motor oil exchanger 19 better known by the acronym "EMO" for evacuating heat generated at the oil sump engine.
  • Such a motor 1 comprises a cylinder casing 6 provided with a plurality of cylinders can be arranged in line. Above the cylinder block 6, along an axis substantially parallel to the vertical axis of the cylinders, is fixed a second housing, said cylinder head cover 5.
  • This cylinder head cover 5 comprises a lower face which is intended to be fixed on an upper face of this cylinder casing 6, which being disposed below this cylinder head housing 5.
  • This cylinder head housing 5 contains in particular the distribution composed mainly of valves and camshafts.
  • This engine 1 also comprises a cylinder head gasket 16 placed between the cylinder head housing 5 and the cylinder casing 6 and in particular between the above-mentioned upper and lower faces.
  • This cooling system 2 may be of the double cooling type, often known as the Anglo-Saxon "split-cooling" mode and in which the coolant circulates independently in a first circuit 7a defined in the cylinder casing 6 and a second circuit 7b included in the cylinder head housing 5, the circulation in the first circuit 7a being established only once a preheating phase of the cylinder block 6 is completed.
  • the main circuit 3 of this cooling system 2 comprises an internal cooling circuit 4 inside the engine 1 which is provided with: a feed pump 9, first and second circuits 7a, 7b of fluid as well as first and second connection areas 8a, 8b.
  • the feed pump 9 is intended to circulate the heat transfer fluid still called cooling fluid in the internal cooling circuit 4 of the engine 1.
  • the first and second circuits 7a, 7b are respectively included in the cylinder block 6 and the cylinder head housing 5.
  • the first circuit 7a is substantially isolated from the second fluid circuit 7b, so the cylinder block 6 and the cylinder head housing 5 are cooled separately with a heat transfer fluid which circulates independently in these first and second circuits 7a, 7b .
  • the engine 1 comprises a cylinder head gasket 16 arranged between the cylinder block 6 and the cylinder head housing 5.
  • This cylinder head gasket 16 may comprise orifices made only in a part 14 of this gasket. 16, for circulation of the coolant between the first and second circuits 7a, 7b.
  • Such a cylinder head gasket 16 provided with these orifices contributes to degassing the first circuit 7a defined in the cylinder casing 6.
  • gas bubbles formed in the first circuit 7a must be able to pass from this first circuit 7a towards the second circuit 7b to be discharged from the internal circuit 4, to the degassing jar 18.
  • Such degassing can take place immediately after the filling of the cooling system 2 in heat transfer fluid, but also during operation of the engine 1 by the creation of gas bubbles in the coolant under the effect of the thermal generated by the combustion in the first circuit 7a.
  • first and second circuits 7a, 7b each comprise an inlet 10a, 11a through which the coolant is introduced in the flow direction F1 in said circuit and an outlet 10b, 11b through which this fluid is discharged in the direction of circulation F3.
  • the inputs 10a, 11a of these first and second circuits 7a, 7b are interconnected in the first connection zone 8a of the internal cooling circuit 4.
  • the outputs 10b, 11b of these two circuits 7a, 7b are also interconnected in the second connection zone 8b of this internal cooling circuit 4.
  • the first connection zone 8a is also connected to a fluid inlet duct 12a of the internal circuit 4 connected in particular to an output of a radiator 17 but also to component outputs of the motor 1 mentioned above.
  • This inlet duct 12a comprises the supply pump 9 provided with an outlet connected directly to the first connection zone 8a.
  • the feed pump 9 contributes to circulating the heat transfer fluid that it receives in particular from this radiator 17 and / or the components of the engine 1, in the first and second circuits 7a, 7b via this first zone. connection 8a.
  • the second connection zone 8b is connected to a fluid discharge conduit 12b of the internal circuit 4.
  • This exhaust duct 12b is in particular connected to the inputs of the radiator 17 and the other components of the engine 1 so that the Heat transfer fluid is transmitted to them according to the activation / deactivation of valves 19 and / or thermostats 19 arranged in the main cooling circuit 3.
  • This radiator 17 included in the main circuit 3 constitutes a heat exchanger for cooling the coolant at the outlet of the internal circuit 4 at the exhaust duct 12b.
  • the radiator 17 is able to send back then the heat transfer fluid cooled to the internal circuit 4 via the inlet conduit 12a provided with the feed pump 9.
  • the first circuit 7a of the internal circuit 4 comprises first and second regulating elements 15a, 15b of the flow of the fluid. These first and second regulating elements 15a, 15b are respectively arranged at the input 10a and the output 10b of said first circuit 7a. Moreover, these regulation elements 15a, 15b are located between the first and second connection zones. 8a, 8b. More precisely, these first and second regulating elements 15a, 15b are located in close proximity to these first and second connection zones 8a, 8b, respectively.
  • the first regulation element 15a is defined to allow / prohibit a circulation of the coolant at the inlet 10a of the first circuit 7a as a function of a temperature Tm of said fluid present in the first circuit 7a of said housing.
  • This first regulating element 15a may be a thermostat provided with a temperature sensor immersed in the heat transfer fluid present in this first circuit 7a or watered by this fluid. It may be a temperature sensor included in the body of the thermostat or a remote sensor arranged in this first circuit 7a.
  • This thermostat may for example be a wax thermostat comprising two flaps arranged at both ends of a wax bulb and whose operation is well known in the state of the art.
  • this first regulation element 15a may be a valve controlled for example by a cooling system processing unit 2 which is connected to a temperature sensor located in the first circuit 7a.
  • the second regulating element 15b is defined to allow a circulation of the coolant at the outlet 10b of the first circuit 7a in a single flow direction F2 of said fluid from the first connection zone 8a to the second connection zone 8b of said system 2 or from the input 10a to the output 10b of this first circuit 7a.
  • This second regulating element 15b may be a non-return valve.
  • a non-return valve may comprise a hollow cylindrical body enclosing a movable member which here takes the form of a ball, and a spring which constantly urges the ball against a seat.
  • the spring is able to compress under the action of a compressive force exerted by the heat transfer fluid flow on the ball so that the latter moves from an initial rest position where the output 10b of the first circuit 7a is closed. at a position where this output 10b is open and the fluid can then be removed from the first circuit 7a. As soon as the fluid no longer exerts such a force, the ball returns to its rest position under the action of a restoring force of the spring.
  • the second regulating element 15b may be a thermostat that may have the same characteristics as the thermostat described for the first regulation element 15b.
  • this second element 15b may be a valve controlled for example by the cooling system processing unit 2 which is connected to a temperature sensor located in the first circuit 7a and / or the first regulation element 15a .
  • the second regulating element 15b can then be connected synchronously with the first regulating element 15a so as to allow / prohibit the circulation of the heat transfer fluid at the outlet 10b of the first circuit 7a substantially simultaneously with said first regulating element 15a.
  • the invention also relates to a method of operating the cooling system 2.
  • This method comprises a step 21 for starting the engine 1.
  • this method provides a step 22 for circulating the coolant in the internal circuit 4.
  • the supply pump 9 whose output is connected to the first connection zone 8a is then likely to provide fluid supply of the first and second circuits 7a, 7b.
  • the method then comprises a step 23 for controlling the flow rate of the coolant in the first circuit 7a from the first and second fluid flow regulating elements 15a, 15b.
  • a step 23 allows to implement a preheating process of the engine 1 to improve the performance of the latter and thus reduce pollutant emissions and fuel consumption.
  • this step 23 comprises a sub-step of prohibiting the circulation of the coolant in the first circuit 7a by the first and / or the second fluid flow regulating element 15a, 15b when a measured temperature Tm fluid present in the first circuit 7a of the cylinder housing 6 is substantially lower than a reference temperature Tf.
  • This reference temperature Tf is defined according to the characteristics of the engine 1 and preferably corresponds to a preheating end temperature of the cylinder casing 6.
  • the natural movement of the heat transfer fluid to make a residual parasitic circulation loop is then eliminated due to the arrangement of the first and second regulating elements 15a, 15b respectively at the entrance and the output of this first circuit 7a. More specifically, this arrangement of these regulating elements 15a, 15b limits or eliminates the effects that may result from the fluid pressure difference in the first and second circuits 7a, 7b and / or the difference in fluid temperature in the latter. is likely to be at the origin of a phenomenon called "thermosiphon". Under these conditions, the heat transfer fluid flow rate in the first circuit 7a is then zero. In addition, the feed pump 9 supplies only the second circuit 7b which is defined in the breech housing 5.
  • This step 23 also comprises a sub-step 25 of authorization of circulation of the coolant in the first circuit 7a by the first and second fluid flow control elements 15a, 15b when a measured temperature Tm of the fluid present in the first circuit 7a of the cylinder casing 6 is substantially greater than or equal to the reference temperature Tf.
  • the heat transfer fluid circulated by the feed pump 9 flows in both the first and second circuits 7a, 7b. This heat transfer fluid travels in particular the first circuit 7a through the first and second regulating elements 15a, 15b until being discharged from the internal circuit 4 after passing through the second connection zone 8b.
  • the invention accelerates the rise in temperature of the cylinder block 6 and helps reduce vehicle consumption and pollutant emissions.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP17167131.6A 2016-04-19 2017-04-19 Kühlsystem eines brennkraftmotors Active EP3236041B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1653441A FR3050233B1 (fr) 2016-04-19 2016-04-19 Systeme de refroidissement d'un moteur thermique

Publications (2)

Publication Number Publication Date
EP3236041A1 true EP3236041A1 (de) 2017-10-25
EP3236041B1 EP3236041B1 (de) 2019-09-11

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EP17167131.6A Active EP3236041B1 (de) 2016-04-19 2017-04-19 Kühlsystem eines brennkraftmotors

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EP (1) EP3236041B1 (de)
FR (1) FR3050233B1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002002917A1 (de) * 2000-07-01 2002-01-10 Robert Bosch Gmbh Vorrichtung zum kühlen einer brennkraftmaschine
FR2856426A1 (fr) * 2004-08-19 2004-12-24 Mark Iv Systemes Moteurs Sa Circuit de refroidissement comportant un organe de regulation du flux
FR2860833A1 (fr) * 2003-10-08 2005-04-15 Peugeot Citroen Automobiles Sa Circuit de refroidissement d'un moteur a combustion interne constitue d'au moins trois passages de refroidissement
EP2383447A2 (de) * 2010-04-28 2011-11-02 Audi AG Kühlmittelkreislauf für eine Brennkraftmaschine
JP2013096301A (ja) * 2011-10-31 2013-05-20 Toyota Motor Corp エンジンの冷却制御装置
EP2876274A1 (de) * 2013-11-25 2015-05-27 Volkswagen Aktiengesellschaft Kühlsystem

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2848248B1 (fr) * 2002-12-06 2006-08-04 Renault Sa Circuit de refroidissement de moteur a combustion interne
JP5257713B2 (ja) * 2011-02-10 2013-08-07 アイシン精機株式会社 車両用冷却装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002002917A1 (de) * 2000-07-01 2002-01-10 Robert Bosch Gmbh Vorrichtung zum kühlen einer brennkraftmaschine
FR2860833A1 (fr) * 2003-10-08 2005-04-15 Peugeot Citroen Automobiles Sa Circuit de refroidissement d'un moteur a combustion interne constitue d'au moins trois passages de refroidissement
FR2856426A1 (fr) * 2004-08-19 2004-12-24 Mark Iv Systemes Moteurs Sa Circuit de refroidissement comportant un organe de regulation du flux
EP2383447A2 (de) * 2010-04-28 2011-11-02 Audi AG Kühlmittelkreislauf für eine Brennkraftmaschine
JP2013096301A (ja) * 2011-10-31 2013-05-20 Toyota Motor Corp エンジンの冷却制御装置
EP2876274A1 (de) * 2013-11-25 2015-05-27 Volkswagen Aktiengesellschaft Kühlsystem

Also Published As

Publication number Publication date
FR3050233B1 (fr) 2019-10-11
FR3050233A1 (fr) 2017-10-20
EP3236041B1 (de) 2019-09-11

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