EP2914827B1 - Cooling management for an engine system equipped with a partial exhaust gas recirculation device - Google Patents

Cooling management for an engine system equipped with a partial exhaust gas recirculation device Download PDF

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Publication number
EP2914827B1
EP2914827B1 EP13783038.6A EP13783038A EP2914827B1 EP 2914827 B1 EP2914827 B1 EP 2914827B1 EP 13783038 A EP13783038 A EP 13783038A EP 2914827 B1 EP2914827 B1 EP 2914827B1
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European Patent Office
Prior art keywords
loop
heat transfer
transfer fluid
circulation
engine
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EP13783038.6A
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German (de)
French (fr)
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EP2914827A1 (en
Inventor
Adrien Pillot
Jérôme J. LAURENT
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Renault SAS
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Renault SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P2005/105—Using two or more pumps
    • 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
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/08—Cabin heater

Definitions

  • the invention relates to the management of the cooling of an engine system equipped with a partial exhaust gas recirculation device, in particular of a diesel engine system.
  • the invention can thus find an application in the automotive field.
  • An engine system is generally cooled by a cooling circuit.
  • an internal combustion engine makes it possible to transform the initial energy supplied by the fuel into movement of the crankshaft. Part of the energy is transformed into thermal energy distributed in the exhaust gases and in losses at the walls of the combustion chamber. Combustion can lead to chamber temperatures of the order of 800°C, whereas the cylinder heads of combustion chambers, when they are made of aluminum alloy, are generally designed to withstand temperatures of 250°C maximum only. To limit the temperatures to acceptable values for good thermomechanical behavior of the motor, it is necessary to evacuate sufficient calories to the environment.
  • the cooling circuit thus prevents the engine from overheating.
  • this circuit can make it possible to relatively quickly ensure an optimal thermal level of one or more other components of the powertrain, to contribute for example to the heating performance of the passenger compartment.
  • An EGR (Exhaust Gas Recirculation) or EGR (Exhaust Gas Recirculation) device thus makes it possible to inject fresh air mixed with exhaust gases into the combustion chamber. This recovery of exhaust gases can reduce nitrogen oxide (NOx) emissions.
  • NOx nitrogen oxide
  • Such a cold loop system thus involves two separate cooling circuits connected to each other.
  • an EGR cooler also called an EGR exchanger
  • an EGR exchanger designed to cool the exhaust gases intended to be reintroduced into the engine intake, into a cooling circuit of the engine itself.
  • a so-called hot loop cooling circuit can comprise an EGR exchanger and an engine cooler, designed to cool an engine, on the same heat transfer fluid circulation loop.
  • the temperature of the EGR device is thus close to the temperature of the engine.
  • a thermostat device makes it possible to maintain the temperature of the heat transfer fluid leaving the engine at a predetermined value, for example 90° C.
  • a so-called mixed-loop cooling circuit can comprise an engine and a radiator in fluid communication so as to form a heat transfer fluid circulation loop, and an EGR exchanger arranged in fluid communication with the radiator so as to form an additional loop. circulation of the heat transfer fluid.
  • a thermostat can make it possible to close a valve on the loop serving the motor, so that when the temperature is below a threshold, for example 90°, the motor is not cooled by the heat transfer fluid.
  • a pump placed between the EGR exchanger and the radiator makes it possible to guarantee circulation of the coolant in the additional loop only, so as to cool the EGR exchanger.
  • GB2473437-A describes such a cooling circuit.
  • the cooling of the partial exhaust gas recirculation device it is possible to better control the temperature in this device and/or the temperature of the engine, or even possibly the temperature of other cooling consumer stations, such as for example a air heater managing the sending of hot gases into the passenger compartment.
  • a air heater managing the sending of hot gases into the passenger compartment.
  • the partial exhaust gas recirculation device can be an EGR device.
  • the cooler of the partial exhaust gas recirculation device is then called an EGR cooler.
  • This piloting of the third loop of a mixed loop circuit can thus be carried out independently of the (de)coupling between the loops.
  • the coupling device can comprise a thermostat arranged to open and close the second loop according to a measured temperature value or estimated, for example as a function of the temperature of the exhaust gases leaving the combustion chamber.
  • the second loop remains closed, so that the heat transfer fluid circulates only in the first and the third loop.
  • a threshold for example 90° C. or other
  • the at least one value received, from which the control signal of the third loop is produced can comprise a temperature value, for example a measured temperature value of the exhaust gases of the engine or heat transfer fluid leaving the engine.
  • provision may be made to reduce the cooling of the partial exhaust gas recirculation device when the temperature measured at the engine outlet is below a threshold, for example 85°, 105° C. or other.
  • the partial exhaust gas recirculation device may be less cooled than if the second pump were operating at the minimum of its capacities.
  • This can be advantageous as the radiator is designed and sized to cool the engine. The radiator can thus provide a relatively high cooling power. By limiting the cooling of the partial exhaust gas recirculation device, it is possible to prevent the temperature of the gases in this device from being too low.
  • control signal can be formulated in such a way as to avoid the boiling of the coolant. In fact, if the heat transfer fluid does not flow quickly enough, it risks evaporating.
  • control signal can be formulated in such a way as to limit the circulation of the heat transfer fluid in the EGR exchanger in the event of detection of the risk of engine overheating.
  • engine overheating it is meant here that the temperature of the coolant at the outlet of the engine exceeds a threshold value, for example a threshold value to which it is subject, for example 90° C., or else a triggering threshold value, for example example 110°C, or other.
  • the cooling circuit may prove to be insufficient to maintain the temperature around the desired threshold, for example 90°.
  • the circulation of heat transfer fluid in the third loop it is possible to limit the quantity of heat transfer fluid withdrawn by this third loop, and therefore allow a greater circulation of heat transfer fluid in the second loop (radiator), which can thus contribute to the engine cooling.
  • the operating point of the engine can be determined from, for example, the engine load and the engine speed.
  • the invention is not limited by the way in which a risk of engine overheating is detected.
  • the at least one value received and from which the control signal of the third loop is developed can be a temperature value, a Boolean parameter value indicative of the state of the EGR , a parameter value indicative of the engine speed, for example a number of revolutions per minutes, a parameter value indicative of the position of the accelerator pedal, and/or other.
  • control signal can be sent to the second pump in order to control this second pump.
  • the second pump can be an electric pump.
  • control signal can make it possible to control a supply voltage of the second pump.
  • the opening duty cycle (OCR) of the second pump goes from 100% to 50%
  • the flow in the radiator can be reduced by half
  • the invention is in no way limited by a control of the second pump.
  • a two- or three-way valve could be provided between the engine, the radiator and the EGR exchanger.
  • the heat transfer fluid from the engine is mainly redirected to the radiator rather than to the EGR exchanger, thus making it possible to cool the engine more than when a greater part of the fluid is taken from the third loop.
  • This two- or three-way valve can be controlled by a management device implementing the method described above.
  • the two-way or three-way valve can be a variable-flow valve.
  • the section of this valve can thus be controlled so as to reduce the flow in the third loop, for example during the start-up phase.
  • the cooling circuit can be a mixed loop circuit.
  • the receiving means may comprise, for example, an input pin, an input port and or other
  • the processing means may comprise a processor core or CPU (Central Processing Unit), a processor or the like.
  • CPU Central Processing Unit
  • the transmission means can for example comprise an output pin, an output port or the like.
  • the engine system comprising a partial exhaust gas recirculation device, the management device described above and the cooling circuit.
  • the engine of this vehicle may for example be a diesel engine, or not.
  • opening a loop it is meant that fluid communication is ensured so that the fluid can traverse the loop in the same direction, for example by opening a valve arranged on the loop.
  • closing a loop it is meant that part of the loop is isolated so as to prevent the circulation of fluid in the loop, for example by closing a valve placed on the loop.
  • a cooling circuit 1 comprises a heater 14, located in the passenger compartment of a motor vehicle not shown as a whole, and an engine 10, connected by conduits so as to form a first loop 21 for circulating heat transfer fluid.
  • Circuit 1 further comprises a radiator 11 arranged on a second heat transfer fluid circulation loop 22.
  • a first pump 12 makes it possible to circulate heat transfer fluid on this second loop so as to reduce the temperature of the engine.
  • a thermostat 13 placed at the output of motor 10 makes it possible to open and close this second loop 22 according to the temperature measured at the output of motor 10.
  • the unit heater 14 can be arranged on the first loop 21, so as to be able to benefit from the circulation of the heat transfer fluid.
  • a jar 15 can constitute a reserve of heat transfer liquid.
  • An EGR exchanger 16 can be placed on a third loop 23.
  • the conduits of this third loop 23 form a connection in parallel with respect to the second loop 22.
  • a second pump 17 can make it possible to circulate fluid between the EGR exchanger 16 and the engine radiator 11.
  • the curve 101 corresponds to temperature values of the coolant at the outlet of the engine 10 in the cooling system 1 of the figure 1 .
  • the curve 161 corresponds to temperature values at the outlet of the EGR exchanger 16 of the circuit of the figure 1 .
  • the curve 200 corresponds to the temperature values of the heat transfer fluid at the outlet of the EGR exchanger 16, when the pump 17 is uncontrolled and maintained at 100% of its capacity.
  • the engine temperature then increases throughout a starting phase until it reaches a threshold value, for example 90° C.
  • a threshold value for example 90° C.
  • the engine temperature increases linearly.
  • the thermostat 13 of the figure 1 makes it possible to close the second heat transfer fluid circulation loop 22 as long as this temperature value of the heat transfer liquid close to the motor 10 is less than 90°.
  • the radiator 11 thus only serves to cool the EGR exchanger 16.
  • the heat transfer fluid is relatively cold and the EGR exchanger 16 can be maintained at relatively low temperatures, for example around 45°C.
  • a management device for example a processor 18 on board the motor vehicle and further comprising the motor system, makes it possible to adapt the flow rate of the second electric pump 17, so as to optimize the operation of the various consumers and to limit the emission of polluting nitrogen oxides.
  • This processor 18 receives signals from various sensors not shown, for example a heat transfer fluid temperature sensor at the engine outlet, and generates a control signal for the second pump 17, so that the latter modulates the flow of coolant.
  • curve 161 may exhibit oscillations slightly greater than 50° C. during this start-up phase. Such temperature values are particularly advantageous in the sense that they make it possible to reconcile low emission of nitrogen oxides and limited risk of clogging.
  • the thermostat 13 opens the second loop 22, that is to say the pump 12 brings heat transfer fluid into the engine 10.
  • the temperature of the coolant is then controlled around 90°.
  • the loops 21, 22 and 23 being in fluid communication with each other, the temperature of the EGR exchanger quickly reaches 90°C.
  • Such a value which would correspond to relatively high levels of pollution and in the start-up phase, remains acceptable here because the EGR is generally inactive when the engine is sufficiently stressed.
  • the heat transfer fluid for example a glycol liquid
  • the heat transfer fluid circulates in the third loop in a clockwise direction in the diagram of the figure 1 .
  • heat transfer fluid arrives in the third loop 23 through what was then the outlet of the radiator 11, according to the arrow referenced 25 on the figure 1 .
  • the heat transfer fluid maintained at a temperature close to 55° C. in the third loop, is mixed with heat transfer fluid whose temperature is close to 90°, since coming from the engine 10, and, quickly, the temperature of the fluid in the EGR exchanger becomes close to that of the fluid in the engine 10.
  • the coolant fluid continues to circulate in the EGR exchanger in the same direction, that is to say on the figure 1 from right to left, but that, on the other hand, the circulation of the coolant in the radiator has been reversed.
  • the heat transfer fluid circulates from left to right on the figure 1 in the radiator 11.
  • the heat transfer fluid circulates from left to right in the radiator 11 of the figure 1 .
  • the radiator 11 is therefore designed to allow the circulation of the heat transfer fluid in both directions.
  • a management method can be implemented by the processor 18 of the figure 1 .
  • a temperature value of the coolant at the engine outlet T M is received, a value of a state_EGR parameter, indicative of the state of an EGR actuator, a value of a parameter of engine load pedal_pos and an engine rpm parameter value rpm_mot.
  • the state_EGR parameter can correspond to the position of the electric actuator linked to the management of the EGR.
  • the engine load parameter can for example be a mean effective pressure value (MEP) on the accelerator pedal.
  • MEP mean effective pressure value
  • the temperature value of the coolant T M is compared with a threshold value, for example 105° C. or 110° C.
  • step 203 a value of a control signal S is generated as a function of the parameter values pedal_pos and consist_mot. More precisely, a first two-dimensional map, called engine cooling map, can make it possible to read a control signal value as a function of the values of these two parameters. This first map is designed to, depending on the operating point of the engine, control the flow in the third loop so as to cool the EGR relatively little and to use the resources of the radiator to further cool the engine.
  • test 202 is negative, that is to say if the temperature is below the threshold value, then it is considered that the vehicle is in a starting or normal operating situation, with a limited risk of overheating.
  • the control value of the second electric pump is still developed according to the parameter values pedal_pos and regime_mot, but using a second two-dimensional map, different from the first map, during a step 204.
  • This second map is designed to control the flow so as to optimize the operation of the EGR, in particular so as to avoid clogging by amalgams.
  • the command signal value generated is transmitted in order to control the electric pump 17.
  • a loop can be set up with an output test 206, for example a test to check that the engine is still on, and a step of introducing a latency time 207, between the execution of two loops.
  • the invention is in no way limited by the way in which the electric pump is controlled.
  • the invention is not limited either to the use of mapping to produce the control signal, or even to particular mappings.
  • the engine cooling map used during step 203 can for example lead to a reduction of 30, 40 or 50% of the RCO for controlling the electric pump 17 when the engine is under relatively little demand, and to a reduction of 90% of this command when the values of the variables pedal_pos and regime_mot correspond to an over-solicitation of the engine.
  • the reliability map implemented in step 204 can also be designed to lower the flow rate in the third loop 23, for example to 40% of the maximum flow rate of the second pump, when the variables pedal_pos and regime_mot risk corresponding to a Beginning phase.
  • This sensor can provide measurement values that can make it possible to better discriminate start-up situations, and therefore to provide a management more suited to these start-up situations during which the third loop is isolated from the second loop.
  • the processor 18 can receive the values read by this sensor and be arranged to, when these values exceed a threshold, increase the flow rate in the third loop 23. It is in fact necessary to avoid the boiling of the heat transfer fluid in this third loop 23.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Description

L'invention concerne la gestion du refroidissement d'un système de moteur équipé d'un dispositif de recirculation partielle des gaz d'échappement, en particulier d'un système de moteur Diesel.The invention relates to the management of the cooling of an engine system equipped with a partial exhaust gas recirculation device, in particular of a diesel engine system.

L'invention peut ainsi trouver une application dans le domaine de l'automobile.The invention can thus find an application in the automotive field.

Un système de moteur est généralement refroidi par un circuit de refroidissement.An engine system is generally cooled by a cooling circuit.

Ainsi, un moteur à combustion interne permet de transformer l'énergie initiale fournie par le carburant en mouvement du vilebrequin. Une partie de l'énergie est transformée en énergie thermique répartie dans les gaz d'échappement et dans des pertes aux parois de la chambre de combustion. La combustion peut conduire à des températures de chambre de l'ordre de 800°C, alors que les culasses des chambres de combustion, lorsqu'elles sont réalisées en alliage d'aluminium, sont en général conçues pour supporter des températures de 250°C maximum seulement. Pour limiter les températures à des valeurs acceptables pour une bonne tenue thermomécanique du moteur, il est nécessaire d'évacuer suffisamment de calories vers l'environnement.Thus, an internal combustion engine makes it possible to transform the initial energy supplied by the fuel into movement of the crankshaft. Part of the energy is transformed into thermal energy distributed in the exhaust gases and in losses at the walls of the combustion chamber. Combustion can lead to chamber temperatures of the order of 800°C, whereas the cylinder heads of combustion chambers, when they are made of aluminum alloy, are generally designed to withstand temperatures of 250°C maximum only. To limit the temperatures to acceptable values for good thermomechanical behavior of the motor, it is necessary to evacuate sufficient calories to the environment.

Le circuit de refroidissement permet ainsi d'éviter la surchauffe du moteur. En outre ce circuit peut permettre d'assurer de façon relativement rapide un niveau thermique optimal d'un ou plusieurs autres composants du groupe motopropulseur, pour contribuer par exemple aux prestations de chauffage de l'habitacle.The cooling circuit thus prevents the engine from overheating. In addition, this circuit can make it possible to relatively quickly ensure an optimal thermal level of one or more other components of the powertrain, to contribute for example to the heating performance of the passenger compartment.

Il est par ailleurs connu de récupérer une partie des gaz d'échappement du moteur pour les introduire à l'admission du moteur. Un dispositif EGR (de l'anglais « Exhaust Gas Recirculation ») ou circuit RGE (« Recyclage des Gaz d'Echappements ») permet ainsi d'injecter dans la chambre de combustion de l'air frais mélangé à des gaz d'échappement. Cette récupération des gaz d'échappement peut permettre de diminuer les émissions d'oxyde d'azote (NOx).It is also known to recover part of the exhaust gases from the engine in order to introduce them into the intake of the engine. An EGR (Exhaust Gas Recirculation) or EGR (Exhaust Gas Recirculation) device thus makes it possible to inject fresh air mixed with exhaust gases into the combustion chamber. This recovery of exhaust gases can reduce nitrogen oxide (NOx) emissions.

Il est en outre connu de refroidir les dispositifs de recirculation partielle des gaz d'échappement, par exemple l'EGR, afin d'améliorer l'efficacité de ces dispositifs. Les émissions d'oxyde d'azote croissent en effet avec la température.It is also known to cool partial exhaust gas recirculation devices, for example EGR, in order to improve the effectiveness of these devices. Nitrogen oxide emissions increase with temperature.

Il a été envisagé de prévoir un deuxième circuit de refroidissement dimensionné pour le dispositif de recirculation des gaz d'échappement. Un tel système de boucle froide implique ainsi deux circuits de refroidissement distincts et connectés entre eux.Provision has been made for a second cooling circuit sized for the exhaust gas recirculation device. Such a cold loop system thus involves two separate cooling circuits connected to each other.

Il a également été envisagé de disposer un refroidisseur EGR, dit aussi échangeur EGR, conçu pour refroidir les gaz d'échappement destinés à être réintroduits à l'admission du moteur, dans un circuit de refroidissement du moteur lui-même.Provision has also been made for an EGR cooler, also called an EGR exchanger, designed to cool the exhaust gases intended to be reintroduced into the engine intake, into a cooling circuit of the engine itself.

En particulier, un circuit de refroidissement dit à boucle chaude, peut comprendre un échangeur EGR et un refroidisseur moteur, conçu pour refroidir un moteur, sur une même boucle de circulation de fluide caloporteur. Dans un circuit à boucle chaude, la température du dispositif EGR est ainsi proche de la température du moteur. Un dispositif de thermostat permet de maintenir la température du fluide caloporteur en sortie du moteur à une valeur prédéterminée, par exemple 90°C.In particular, a so-called hot loop cooling circuit can comprise an EGR exchanger and an engine cooler, designed to cool an engine, on the same heat transfer fluid circulation loop. In a hot loop circuit, the temperature of the EGR device is thus close to the temperature of the engine. A thermostat device makes it possible to maintain the temperature of the heat transfer fluid leaving the engine at a predetermined value, for example 90° C.

Or, une telle valeur de température du fluide caloporteur, de l'ordre de 70 à 95° C, reste relativement élevée pour l'EGR, de sorte qu'il existe un besoin pour un système qui permettrait de réduire les émissions d'oxydes d'azote.However, such a temperature value of the heat transfer fluid, of the order of 70 to 95° C., remains relatively high for the EGR, so that there is a need for a system which would make it possible to reduce the emissions of oxides nitrogen.

Il a été envisagé de découpler temporairement le circuit de refroidissement de l'EGR du circuit de refroidissement du moteur. Ainsi, un circuit de refroidissement dit à boucle mixte peut comprendre un moteur et un radiateur en communication fluide de façon à former une boucle de circulation de fluide caloporteur, et un échangeur EGR disposé en communication fluide avec le radiateur de façon à former une boucle supplémentaire de circulation du fluide caloporteur. Un thermostat peut permettre de fermer une vanne sur la boucle desservant le moteur, de sorte que lorsque la température est en deçà d'un seuil, par exemple 90°, le moteur n'est pas refroidi par le fluide caloporteur. En revanche, même si la boucle du moteur est ainsi fermée, une pompe placée entre l'échangeur EGR et le radiateur permet de garantir une circulation du fluide caloporteur dans la boucle supplémentaire seulement, de façon à refroidir l'échangeur EGR. GB2473437-A décrit un tel circuit de refroidissement.Consideration was given to temporarily decoupling the EGR cooling circuit from the engine cooling circuit. Thus, a so-called mixed-loop cooling circuit can comprise an engine and a radiator in fluid communication so as to form a heat transfer fluid circulation loop, and an EGR exchanger arranged in fluid communication with the radiator so as to form an additional loop. circulation of the heat transfer fluid. A thermostat can make it possible to close a valve on the loop serving the motor, so that when the temperature is below a threshold, for example 90°, the motor is not cooled by the heat transfer fluid. On the other hand, even if the engine loop is thus closed, a pump placed between the EGR exchanger and the radiator makes it possible to guarantee circulation of the coolant in the additional loop only, so as to cool the EGR exchanger. GB2473437-A describes such a cooling circuit.

Il existe un besoin pour un refroidissement plus adapté.There is a need for more suitable cooling.

Il est proposé un procédé de gestion du refroidissement d'un système de moteur équipé d'un dispositif de recirculation partielle des gaz d'échappement, au moyen d'un circuit de refroidissement comprenant :

  • un dispositif de radiateur apte à abaisser la température d'un fluide caloporteur,
  • un dispositif d'aérotherme situé dans l'habitacle,
  • un moteur en communication fluide avec le dispositif d'aérotherme de façon à former une première boucle de circulation de fluide caloporteur,
  • un premier moyen de circulation de fluide disposé pour faire circuler du fluide caloporteur issu du radiateur dans le moteur, par exemple une première pompe, de façon à former une deuxième boucle de circulation de fluide caloporteur,
  • un refroidisseur (ou échangeur) du dispositif de recirculation partielle des gaz d'échappement, pour refroidir ledit dispositif de recirculation partielle des gaz d'échappement, et en communication fluide avec le radiateur, de façon à former une troisième boucle de circulation du fluide caloporteur,
  • un deuxième moyen de circulation de fluide pour faire circuler du fluide caloporteur issu du radiateur dans le refroidisseur du dispositif de recirculation partielle des gaz d'échappement, par exemple une deuxième pompe,
  • un dispositif de découplage agencé pour dans un premier mode, fermer la deuxième boucle de façon à autoriser la circulation de fluide caloporteur uniquement dans la première boucle et la troisième boucle, et dans un deuxième mode, ouvrir la deuxième boucle de façon à avoir une circulation de fluide caloporteur dans les trois boucles au même moment.
A method is proposed for managing the cooling of an engine system equipped with a partial exhaust gas recirculation device, by means of a cooling circuit comprising:
  • a radiator device capable of lowering the temperature of a heat transfer fluid,
  • an air heater device located in the passenger compartment,
  • a motor in fluid communication with the unit heater device so as to form a first heat transfer fluid circulation loop,
  • a first fluid circulation means arranged to circulate heat transfer fluid from the radiator in the engine, for example a first pump, so as to form a second heat transfer fluid circulation loop,
  • a cooler (or exchanger) of the partial exhaust gas recirculation device, for cooling said partial exhaust gas recirculation device, and in fluid communication with the radiator, so as to form a third circulation loop for the heat transfer fluid ,
  • a second fluid circulation means for circulating heat transfer fluid from the radiator in the cooler of the partial exhaust gas recirculation device, for example a second pump,
  • a decoupling device arranged to, in a first mode, close the second loop so as to allow the circulation of heat transfer fluid only in the first loop and the third loop, and in a second mode, open the second loop so as to have a circulation of coolant in all three loops at the same time.

Le procédé comprend :

  • recevoir au moins une valeur d'un paramètre relatif au système de moteur, ladite au moins une valeur d'un paramètre relatif au système de moteur comprend au moins une valeur de comparer la valeur de température à un seuil,
  • élaborer un signal de commande de la troisième boucle en fonction d'au moins une valeur reçue, de telle sorte que
  • si la valeur de température est inférieure au seuil, on élabore le signal de commande de façon à optimiser le fonctionnement du dispositif de recirculation partielle des gaz d'échappement, et
  • si la valeur de température est supérieure au seuil, on élabore le signal de commande de façon à limiter une élévation de la température du moteur en réduisant le refroidissement du dispositif de recirculation partielle des gaz d'échappement, et
    • envoyer le signal de commande vers la troisième boucle afin d'adapter le refroidissement à la situation du système de moteur.
The process includes:
  • receiving at least one engine system parameter value, said at least one engine system parameter value comprises at least one value to compare the temperature value to a threshold,
  • generating a control signal for the third loop as a function of at least one value received, such that
  • if the temperature value is below the threshold, the control signal is processed so as to optimize the operation of the partial exhaust gas recirculation device, and
  • if the temperature value is greater than the threshold, the control signal is formulated so as to limit a rise in the temperature of the engine by reducing the cooling of the partial exhaust gas recirculation device, and
    • send the control signal to the third loop in order to adapt the cooling to the situation of the engine system.

Ainsi, en pilotant le refroidissement du dispositif de recirculation partielle des gaz d'échappement, on peut mieux contrôler la température dans ce dispositif et/ou la température du moteur, voire éventuellement la température d'autres postes consommateurs de refroidissement, comme par exemple un aérotherme gérant l'envoi de gaz chauds dans l'habitacle. En assurant ainsi un meilleur contrôle de la température des différents postes consommateurs de refroidissement, on peut permettre d'optimiser la combustion, et donc de réduire encore l'émission d'oxydes d'azote.Thus, by controlling the cooling of the partial exhaust gas recirculation device, it is possible to better control the temperature in this device and/or the temperature of the engine, or even possibly the temperature of other cooling consumer stations, such as for example a air heater managing the sending of hot gases into the passenger compartment. By thus ensuring better control of the temperature of the various cooling consumer stations, it is possible to optimize combustion, and therefore to further reduce the emission of nitrogen oxides.

Avantageusement et de façon non limitative, le dispositif de recirculation partielle des gaz d'échappement peut être un dispositif EGR. Le refroidisseur du dispositif de recirculation partielle des gaz d'échappement est alors dit refroidisseur EGR.Advantageously and without limitation, the partial exhaust gas recirculation device can be an EGR device. The cooler of the partial exhaust gas recirculation device is then called an EGR cooler.

Ce pilotage de la troisième boucle d'un circuit à boucle mixte peut ainsi être effectué indépendamment du (dé)couplage entre les boucles.This piloting of the third loop of a mixed loop circuit can thus be carried out independently of the (de)coupling between the loops.

Avantageusement et de façon non limitative, le dispositif de couplage peut comprendre un thermostat agencé pour ouvrir et fermer la deuxième boucle en fonction d'une valeur de température mesurée ou estimée, par exemple en fonction de la température des gaz d'échappement en sortie de la chambre de combustion.Advantageously and in a non-limiting way, the coupling device can comprise a thermostat arranged to open and close the second loop according to a measured temperature value or estimated, for example as a function of the temperature of the exhaust gases leaving the combustion chamber.

Avantageusement et de façon non limitative, tant que la valeur de température reçue par le dispositif de thermostat est inférieure à un seuil, par exemple 90°C ou autre, la deuxième boucle reste fermée, de sorte que le fluide caloporteur circule seulement dans la première et la troisième boucle. Lorsque la température dépasse la valeur seuil, la deuxième boucle est ouverte, et le fluide caloporteur circule à la fois dans la première, la deuxième et la troisième boucle.Advantageously and in a non-limiting manner, as long as the temperature value received by the thermostat device is below a threshold, for example 90° C. or other, the second loop remains closed, so that the heat transfer fluid circulates only in the first and the third loop. When the temperature exceeds the threshold value, the second loop is opened, and the heat transfer fluid circulates simultaneously in the first, the second and the third loop.

Avantageusement et de façon non limitative, la au moins une valeur reçue, à partir de laquelle est élaboré le signal de commande de la troisième boucle, peut comprendre une valeur de température, par exemple une valeur de température mesurée des gaz d'échappement du moteur ou du fluide caloporteur en sortie du moteur.Advantageously and in a non-limiting manner, the at least one value received, from which the control signal of the third loop is produced, can comprise a temperature value, for example a measured temperature value of the exhaust gases of the engine or heat transfer fluid leaving the engine.

Par exemple, on pourra prévoir de réduire le refroidissement du dispositif de recirculation partielle des gaz d'échappement lorsque la température mesurée en sortie du moteur est inférieure à un seuil, par exemple 85°, 105°C ou autre.For example, provision may be made to reduce the cooling of the partial exhaust gas recirculation device when the temperature measured at the engine outlet is below a threshold, for example 85°, 105° C. or other.

En particulier, en phase de démarrage, le dispositif de recirculation partielle des gaz d'échappement peut être moins refroidi que si la deuxième pompe fonctionnait au minimum de ses capacités. Ceci peut être avantageux dans la mesure où le radiateur est conçu et dimensionné pour refroidir le moteur. Le radiateur peut ainsi fournir une puissance de refroidissement relativement élevée. En limitant le refroidissement du dispositif de recirculation partielle des gaz d'échappement, on peut éviter que la température des gaz dans ce dispositif soit trop basse.In particular, during the start-up phase, the partial exhaust gas recirculation device may be less cooled than if the second pump were operating at the minimum of its capacities. This can be advantageous as the radiator is designed and sized to cool the engine. The radiator can thus provide a relatively high cooling power. By limiting the cooling of the partial exhaust gas recirculation device, it is possible to prevent the temperature of the gases in this device from being too low.

En effet, si l'émission d'oxyde d'azote augmente avec la température, il existe toutefois un risque de colmatage par amalgames lorsque la température ambiante est relativement froide, par exemple inférieure à 10°C, et lorsque le niveau d'hydrocarbures est relativement élevé. Un amalgame de suies, avec condensation d'eau sur des parois froides du refroidisseur EGR risque de réduire la section de passage des gaz et peut entraîner à terme un colmatage total du refroidisseur. Un tel encrassement risque d'imposer au client des réparations multiples. En outre la norme anti pollution, par exemple la norme Euro6, risque de ne pas être respectée.Indeed, if the emission of nitrogen oxide increases with the temperature, there is however a risk of clogging by amalgams when the ambient temperature is relatively cold, for example less than 10°C, and when the level of hydrocarbons is relatively high. An amalgam of soot, with water condensation on the cold walls of the EGR cooler, risks reducing the section through which the gases pass and can eventually lead to total clogging of the cooler. Such fouling may require the customer to make multiple repairs. In addition, the anti-pollution standard, for example the Euro6 standard, may not be respected.

Ainsi, en limitant le refroidissement de l'échangeur EGR lors du démarrage, on peut maintenir la température du dispositif EGR à des valeurs suffisamment élevées pour éviter un colmatage, tout en étant suffisamment basse pour garantir une relativement faible émission d'oxydes d'azote.Thus, by limiting the cooling of the EGR exchanger during start-up, it is possible to maintain the temperature of the EGR device at values high enough to avoid clogging, while being low enough to guarantee a relatively low emission of nitrogen oxides.

Avantageusement et de façon non limitative, le signal de commande peut être élaboré de façon à éviter l'ébullition du liquide de refroidissement. En effet si le fluide caloporteur ne s'écoule pas assez rapidement, il risque de s'évaporer.Advantageously and in a non-limiting way, the control signal can be formulated in such a way as to avoid the boiling of the coolant. In fact, if the heat transfer fluid does not flow quickly enough, it risks evaporating.

Avantageusement et de façon non limitative, le signal de commande peut être élaboré de façon à limiter la circulation du fluide caloporteur dans l'échangeur EGR en cas de détection de risque de surchauffe moteur. Par « surchauffe moteur », on entend ici que la température du fluide caloporteur en sortie du moteur dépasse une valeur seuil, par exemple une valeur seuil à laquelle elle est asservie, par exemple 90°C, ou bien une valeur seuil de déclenchement, par exemple 110°C, ou autre.Advantageously and in a non-limiting way, the control signal can be formulated in such a way as to limit the circulation of the heat transfer fluid in the EGR exchanger in the event of detection of the risk of engine overheating. By "engine overheating", it is meant here that the temperature of the coolant at the outlet of the engine exceeds a threshold value, for example a threshold value to which it is subject, for example 90° C., or else a triggering threshold value, for example example 110°C, or other.

En effet, lorsque le moteur est relativement sollicité, le circuit de refroidissement peut s'avérer insuffisant pour maintenir la température autour du seuil souhaité, par exemple 90°. En limitant la circulation de fluide caloporteur dans la troisième boucle, on peut limiter la quantité de fluide caloporteur prélevée par cette troisième boucle, et donc permettre une plus grande circulation de fluide caloporteur dans la deuxième boucle (radiateur), ce qui peut ainsi participer au refroidissement du moteur.Indeed, when the engine is relatively stressed, the cooling circuit may prove to be insufficient to maintain the temperature around the desired threshold, for example 90°. By limiting the circulation of heat transfer fluid in the third loop, it is possible to limit the quantity of heat transfer fluid withdrawn by this third loop, and therefore allow a greater circulation of heat transfer fluid in the second loop (radiator), which can thus contribute to the engine cooling.

On peut détecter un risque de surchauffe lorsque la température du moteur ou la température du fluide caloporteur dans la première, deuxième et/ou troisième boucle atteint un seuil de température, ou bien encore selon le point de fonctionnement du moteur. Le point de fonctionnement du moteur peut être déterminé à partir par exemple de la charge du moteur et du régime moteur. De manière générale, l'invention n'est pas limitée par la façon dont on détecte un risque de surchauffe moteur.It is possible to detect a risk of overheating when the temperature of the engine or the temperature of the heat transfer fluid in the first, second and/or third loop reaches a temperature threshold, or even according to the operating point of the engine. The operating point of the engine can be determined from, for example, the engine load and the engine speed. In general, the invention is not limited by the way in which a risk of engine overheating is detected.

Avantageusement et de façon non limitative, la au moins une valeur reçue et à partir de laquelle on élabore le signal de commande de la troisième boucle, peut être une valeur de température, une valeur de paramètre booléen indicatif de l'état de l'EGR, une valeur de paramètre indicatif du régime du moteur, par exemple un nombre de tours par minutes, une valeur de paramètre indicatif de la position de la pédale d'accélérateur, et/ou autre.Advantageously and in a non-limiting way, the at least one value received and from which the control signal of the third loop is developed, can be a temperature value, a Boolean parameter value indicative of the state of the EGR , a parameter value indicative of the engine speed, for example a number of revolutions per minutes, a parameter value indicative of the position of the accelerator pedal, and/or other.

Avantageusement et de façon non limitative, le signal de commande peut être envoyé vers la deuxième pompe afin de piloter cette deuxième pompe. Par exemple, on pourra prévoir de commander le débit de cette deuxième pompe. Un débit relativement faible entrainera un refroidissement relativement peu efficace.Advantageously and in a non-limiting manner, the control signal can be sent to the second pump in order to control this second pump. For example, provision could be made to control the flow rate of this second pump. A relatively low flow rate will result in relatively inefficient cooling.

Avantageusement et de façon non limitative, la deuxième pompe peut être une pompe électrique.Advantageously and without limitation, the second pump can be an electric pump.

Avantageusement et de façon non limitative, le signal de commande peut permettre de piloter une tension d'alimentation de la deuxième pompe.Advantageously and in a non-limiting way, the control signal can make it possible to control a supply voltage of the second pump.

Par exemple, lorsque le rapport cyclique d'ouverture (RCO) de la deuxième pompe passe de 100% à 50%, le débit dans le radiateur peut être diminué de moitié.For example, when the opening duty cycle (OCR) of the second pump goes from 100% to 50%, the flow in the radiator can be reduced by half.

L'invention n'est en rien limitée par une commande de la deuxième pompe.The invention is in no way limited by a control of the second pump.

Par exemple, on pourrait prévoir de piloter directement le radiateur de façon à limiter l'abaissement de température effectué au sein du radiateur lorsque la deuxième boucle est ouverte.For example, provision could be made to drive the radiator directly so as to limit the lowering of temperature carried out within the radiator when the second loop is open.

Selon un autre exemple, on pourrait prévoir une vanne deux ou trois voies entre le moteur, le radiateur et l'échangeur EGR. En cas de surchauffe moteur, le fluide caloporteur issu du moteur est principalement redirigé vers le radiateur plutôt que vers l'échangeur EGR, permettant ainsi de refroidir davantage le moteur que lorsqu'une plus grande partie de fluide est prélevée dans la troisième boucle. Cette vanne deux ou trois voies peut être pilotée par un dispositif de gestion mettant en œuvre le procédé décrit ci-dessus.According to another example, a two- or three-way valve could be provided between the engine, the radiator and the EGR exchanger. In the event of engine overheating, the heat transfer fluid from the engine is mainly redirected to the radiator rather than to the EGR exchanger, thus making it possible to cool the engine more than when a greater part of the fluid is taken from the third loop. This two- or three-way valve can be controlled by a management device implementing the method described above.

Selon encore un autre exemple, la vanne deux ou trois voies peut être une vanne à débit variable. La section de cette vanne peut ainsi être pilotée de façon à réduire le débit dans la troisième boucle par exemple en phase de démarrage.According to yet another example, the two-way or three-way valve can be a variable-flow valve. The section of this valve can thus be controlled so as to reduce the flow in the third loop, for example during the start-up phase.

En gérant ainsi plus finement le fonctionnement de la troisième boucle que dans l'art antérieur dans lequel la deuxième pompe est soit arrêtée soit à 100% de ses capacités, on peut ainsi assurer un refroidissement plus optimal et donc limiter les émissions polluantes.By thus managing the operation of the third loop more finely than in the prior art in which the second pump is either stopped or at 100% of its capacity, it is thus possible to ensure more optimal cooling and therefore to limit polluting emissions.

Il est en outre proposé un dispositif de gestion du refroidissement du moteur équipé d'un dispositif de recirculation partielle des gaz d'échappement pour un circuit de refroidissement comprenant :

  • un dispositif de radiateur apte à abaisser la température d'un fluide caloporteur,
  • un dispositif d'aérotherme situé dans l'habitacle,
  • un moteur, en communication fluide avec le dispositif d'aérotherme, de façon à former une première boucle de circulation de fluide caloporteur,
  • un premier moyen de circulation de fluide disposé pour faire circuler du fluide caloporteur issu du radiateur dans le moteur, par exemple une première pompe, de façon à former une deuxième boucle de circulation de fluide caloporteur,
  • un refroidisseur (ou échangeur) du dispositif de recirculation partielle des gaz d'échappement, en communication fluide avec le radiateur, de façon à former une troisième boucle de circulation du fluide caloporteur.
    un deuxième moyen de circulation de fluide pour faire circuler du fluide caloporteur issu du radiateur dans le refroidisseur du dispositif de recirculation partielle des gaz d'échappement, par exemple une deuxième pompe,
    • un dispositif de découplage agencé pour dans un premier mode, fermer la deuxième boucle de façon à autoriser la circulation de fluide caloporteur uniquement dans la première boucle et la troisième boucle, et dans un deuxième mode, ouvrir la deuxième boucle de façon à avoir une circulation de fluide caloporteur dans la deuxième et la troisième boucle au même moment.
There is also proposed an engine cooling management device equipped with a partial exhaust gas recirculation device for a cooling circuit comprising:
  • a radiator device capable of lowering the temperature of a heat transfer fluid,
  • an air heater device located in the passenger compartment,
  • a motor, in fluid communication with the unit heater device, so as to form a first heat transfer fluid circulation loop,
  • a first fluid circulation means arranged to circulate heat transfer fluid from the radiator in the engine, for example a first pump, so as to form a second heat transfer fluid circulation loop,
  • a cooler (or exchanger) of the partial exhaust gas recirculation device, in fluid communication with the radiator, so as to form a third circulation loop for the heat transfer fluid.
    a second fluid circulation means for circulating heat transfer fluid from the radiator in the cooler of the partial exhaust gas recirculation device, for example a second pump,
    • a decoupling device arranged to, in a first mode, close the second loop so as to allow the circulation of heat transfer fluid only in the first loop and the third loop, and in a second mode, open the second loop so as to have a circulation of coolant in the second and third loop at the same time.

Le dispositif de gestion comprend :

  • des moyens de réception pour recevoir au moins une valeur d'un paramètre relatif au système de moteur, par exemple une valeur de température, de régime moteur, d'état d'activation d'un dispositif EGR, ou autre.
  • des moyens de traitement pour élaborer un signal de commande de la troisième boucle en fonction de cette au moins une valeur reçue, de façon à réduire le refroidissement du dispositif de recirculation partielle des gaz d'échappement, et
des moyens de transmission pour transmettre le signal de commande élaboré vers la troisième boucle, le dispositif comprenat un ou plusieurs processeurs numériques du traitement du signal, tel qu'un microprocesseur et/ou un microcontrôleur, et un produit programme d'ordinateur comprenant des instructions pour effectuer les étapes du procédé de l'invention.The management device includes:
  • receiving means for receiving at least one value of a parameter relating to the engine system, for example a value of temperature, engine speed, activation state of an EGR device, or the like.
  • processing means for generating a control signal for the third loop as a function of this at least one value received, so as to reduce the cooling of the partial exhaust gas recirculation device, and
transmission means for transmitting the generated control signal to the third loop, the device comprising one or more digital signal processing processors, such as a microprocessor and/or a microcontroller, and a computer program product comprising instructions to carry out the steps of the method of the invention.

Le circuit de refroidissement peut être un circuit à boucle mixte.The cooling circuit can be a mixed loop circuit.

Les moyens de réception peuvent comprendre par exemple, un pin d'entrée, un port d'entrée et ou autreThe receiving means may comprise, for example, an input pin, an input port and or other

Les moyens de traitement peuvent comprendre un cœur de processeur ou CPU (de l'anglais « Central Processing Unit »), un processeur ou autre.The processing means may comprise a processor core or CPU (Central Processing Unit), a processor or the like.

Les moyens de transmission peuvent par exemple comprendre un pin de sortie, un port de sortie ou autre.The transmission means can for example comprise an output pin, an output port or the like.

Il est en outre proposé un système de moteur comprenant un dispositif de recirculation partielle des gaz d'échappement, le dispositif de gestion décrit ci-dessus et le circuit de refroidissement. Le moteur de ce véhicule peut être par exemple un moteur Diesel, ou non.There is also proposed an engine system comprising a partial exhaust gas recirculation device, the management device described above and the cooling circuit. The engine of this vehicle may for example be a diesel engine, or not.

Il est en outre proposé un véhicule automobile, comprenant le système de moteur décrit ci-dessus.There is further provided a motor vehicle, comprising the engine system described above.

Par « ouvrir une boucle », on entend qu'on assure une communication fluide de sorte que le fluide puisse parcourir la boucle dans un même sens, par exemple un ouvrant une vanne disposée sur la boucle.By “opening a loop”, it is meant that fluid communication is ensured so that the fluid can traverse the loop in the same direction, for example by opening a valve arranged on the loop.

Par « fermer une boucle », on entend que l'on isole une partie de la boucle de façon à empêcher la circulation de fluide dans la boucle, par exemple en fermant une vanne disposée sur la boucle.By “closing a loop”, it is meant that part of the loop is isolated so as to prevent the circulation of fluid in the loop, for example by closing a valve placed on the loop.

L'invention sera mieux comprise en référence aux figures, lesquelles illustrent des modes de réalisation non limitatifs.

  • La figure 1 représente schématiquement un exemple de système de refroidissement selon un mode de réalisation de l'invention.
  • La figure 2 est un graphique montrant des valeurs de température du fluide caloporteur en sortie du moteur et du fluide caloporteur en sortie de l'échangeur EGR, avec ou sans pilotage de la deuxième pompe, en fonction du temps.
  • La figure 3 est un logigramme d'un exemple de procédé selon un mode de réalisation de l'invention.
The invention will be better understood with reference to the figures, which illustrate non-limiting embodiments.
  • The figure 1 schematically represents an example of a cooling system according to one embodiment of the invention.
  • The picture 2 is a graph showing temperature values of the coolant at the outlet of the engine and of the coolant at outlet of the EGR exchanger, with or without control of the second pump, depending on the time.
  • The picture 3 is a flowchart of an exemplary method according to one embodiment of the invention.

En référence à la figure 1, un circuit de refroidissement 1 comprend un aérotherme 14, situé dans l'habitacle d'un véhicule automobile non représenté dans son ensemble, et un moteur 10, raccordés par des conduits de façon à former une première boucle 21 de circulation de fluide caloporteur.With reference to the figure 1 , a cooling circuit 1 comprises a heater 14, located in the passenger compartment of a motor vehicle not shown as a whole, and an engine 10, connected by conduits so as to form a first loop 21 for circulating heat transfer fluid.

Le circuit 1 comprend en outre un radiateur 11 disposé sur une deuxième boucle de circulation de fluide caloporteur 22. Une première pompe 12 permet de faire circuler du fluide caloporteur sur cette deuxième boucle de façon à réduire la température du moteur. Un thermostat 13 placé en sortie du moteur 10 permet d'ouvrir et de fermer cette deuxième boucle 22 selon la température mesurée en sortie du moteur 10.Circuit 1 further comprises a radiator 11 arranged on a second heat transfer fluid circulation loop 22. A first pump 12 makes it possible to circulate heat transfer fluid on this second loop so as to reduce the temperature of the engine. A thermostat 13 placed at the output of motor 10 makes it possible to open and close this second loop 22 according to the temperature measured at the output of motor 10.

D'autres consommateurs, par exemple l'aérotherme 14, peuvent être disposés sur la première boucle 21, de façon à pouvoir bénéficier de la circulation du fluide caloporteur.Other consumers, for example the unit heater 14, can be arranged on the first loop 21, so as to be able to benefit from the circulation of the heat transfer fluid.

En outre, un bocal 15 peut constituer une réserve de liquide caloporteur.In addition, a jar 15 can constitute a reserve of heat transfer liquid.

Un échangeur EGR 16 peut être placé sur une troisième boucle 23. Les conduits de cette troisième boucle 23 forment un branchement en parallèle par rapport à la deuxième boucle 22. Une deuxième pompe 17 peut permettre de faire circuler du fluide entre l'échangeur EGR 16 et le radiateur du moteur 11.An EGR exchanger 16 can be placed on a third loop 23. The conduits of this third loop 23 form a connection in parallel with respect to the second loop 22. A second pump 17 can make it possible to circulate fluid between the EGR exchanger 16 and the engine radiator 11.

En référence à la figure 2, la courbe 101 correspond à des valeurs de température du liquide caloporteur en sortie du moteur 10 dans le système de refroidissement 1 de la figure 1. La courbe 161 correspond à des valeurs de température en sortie de l'échangeur EGR 16 du circuit de la figure 1. Enfin, la courbe 200 correspondent à des valeurs de température du fluide caloporteur en sortie de l'échangeur EGR 16, lorsque la pompe 17 est non pilotée et maintenue à 100% de ses capacités.With reference to the picture 2 , the curve 101 corresponds to temperature values of the coolant at the outlet of the engine 10 in the cooling system 1 of the figure 1 . The curve 161 corresponds to temperature values at the outlet of the EGR exchanger 16 of the circuit of the figure 1 . Finally, the curve 200 corresponds to the temperature values of the heat transfer fluid at the outlet of the EGR exchanger 16, when the pump 17 is uncontrolled and maintained at 100% of its capacity.

Les valeurs de température de ces courbes 101, 161 et 200 sont indicatives, ces courbes servant principalement à expliquer l'utilité de l'invention.The temperature values of these curves 101, 161 and 200 are indicative, these curves mainly serving to explain the usefulness of the invention.

A l'instant t=0 le moteur est allumé. La température du moteur croît alors pendant toute une phase de démarrage jusqu'à atteindre une valeur seuil, par exemple 90° C. Dans cet exemple la température du moteur croît linéairement. Le thermostat 13 de la figure 1 permet de fermer la deuxième boucle de circulation de fluide caloporteur 22 tant que cette valeur de température du liquide caloporteur à proximité du moteur 10 est inférieure à 90°.At time t=0 the engine is on. The engine temperature then increases throughout a starting phase until it reaches a threshold value, for example 90° C. In this example, the engine temperature increases linearly. The thermostat 13 of the figure 1 makes it possible to close the second heat transfer fluid circulation loop 22 as long as this temperature value of the heat transfer liquid close to the motor 10 is less than 90°.

Pendant cette phase de démarrage, le radiateur 11 sert ainsi uniquement au refroidissement de l'échangeur EGR 16.During this start-up phase, the radiator 11 thus only serves to cool the EGR exchanger 16.

Si la deuxième pompe 17 est laissée à 100% de ses capacités, alors le fluide caloporteur est relativement froid et l'échangeur EGR 16 peut être maintenu à des températures relativement faibles, par exemple autour de 45°C. Or, il n'est généralement pas souhaitable que les gaz réinjectés par l'EGR soient refroidis par du fluide caloporteur ayant une température en deçà de 50°C car il existe un risque de colmatage.If the second pump 17 is left at 100% of its capacity, then the heat transfer fluid is relatively cold and the EGR exchanger 16 can be maintained at relatively low temperatures, for example around 45°C. However, it is generally undesirable for the gases reinjected by the EGR to be cooled by heat transfer fluid having a temperature below 50° C. because there is a risk of clogging.

Un dispositif de gestion, par exemple un processeur 18 embarqué dans le véhicule automobile et comprenant en outre le système de moteur, permet d'adapter le débit de la deuxième pompe électrique 17, de façon à optimiser le fonctionnement des différents consommateurs et de limiter l'émission d'oxydes d'azotes polluants.A management device, for example a processor 18 on board the motor vehicle and further comprising the motor system, makes it possible to adapt the flow rate of the second electric pump 17, so as to optimize the operation of the various consumers and to limit the emission of polluting nitrogen oxides.

Ce processeur 18 reçoit des signaux issus de différents capteurs non représentés, par exemple un capteur de température du fluide caloporteur à la sortie du moteur, et génère un signal de commande de la deuxième pompe 17, de sorte que celle-ci module le débit de fluide caloporteur.This processor 18 receives signals from various sensors not shown, for example a heat transfer fluid temperature sensor at the engine outlet, and generates a control signal for the second pump 17, so that the latter modulates the flow of coolant.

En pilotant la pompe électrique 17, de façon à réduire le débit de fluide caloporteur dans la troisième boucle 23 pendant cette phase de démarrage, on peut éviter de maintenir l'échangeur EGR à des températures trop faibles. Ainsi, la courbe 161 peut présenter des oscillations légèrement supérieures à 50°C pendant cette phase de démarrage. De telles valeurs de température sont particulièrement avantageuses en ce sens qu'elles permettent de concilier faible émission d'oxydes d'azotes et risque de colmatage limité.By controlling the electric pump 17, so as to reduce the flow of coolant in the third loop 23 during this start-up phase, it is possible to avoid maintaining the EGR exchanger at temperatures that are too low. Thus, curve 161 may exhibit oscillations slightly greater than 50° C. during this start-up phase. Such temperature values are particularly advantageous in the sense that they make it possible to reconcile low emission of nitrogen oxides and limited risk of clogging.

Lorsque la température du moteur atteint 90°C, alors le thermostat 13 ouvre la deuxième boucle 22, c'est-à-dire que la pompe 12 amène du fluide caloporteur dans le moteur 10. La température du liquide de refroidissement est alors asservie autour de 90°. Les boucles 21, 22 et 23 étant en communication fluide l'une avec l'autre, la température de l'échangeur EGR atteint rapidement les 90°C. Une telle valeur, qui correspondrait à des niveaux de pollution relativement élevés et en phase de démarrage, reste ici acceptable car l'EGR est en général inactif lorsque le moteur est suffisamment sollicité.When the engine temperature reaches 90° C., then the thermostat 13 opens the second loop 22, that is to say the pump 12 brings heat transfer fluid into the engine 10. The temperature of the coolant is then controlled around 90°. The loops 21, 22 and 23 being in fluid communication with each other, the temperature of the EGR exchanger quickly reaches 90°C. Such a value, which would correspond to relatively high levels of pollution and in the start-up phase, remains acceptable here because the EGR is generally inactive when the engine is sufficiently stressed.

Lorsque le système de moteur est dans la phase de démarrage, le fluide caloporteur, par exemple un liquide glycolé, circule dans la troisième boucle dans le sens des aiguilles d'une montre sur le schéma de la figure 1.When the engine system is in the starting phase, the heat transfer fluid, for example a glycol liquid, circulates in the third loop in a clockwise direction in the diagram of the figure 1 .

Lorsque le dispositif de thermostat 13 ouvre la deuxième boucle 22, du fluide caloporteur arrive dans la troisième boucle 23 par ce qui était alors la sortie du radiateur 11, selon la flèche référencée 25 sur la figure 1. Dit autrement, le fluide caloporteur, maintenu à une température proche de 55°C dans la troisième boucle, est mélangé à du fluide caloporteur dont la température est proche de 90°, puisque issu du moteur 10, et, rapidement, la température du fluide dans l'échangeur EGR devient proche de celle du fluide dans le moteur 10. On pourra relever qu'après une telle stabilisation le fluide caloporteur continue à circuler dans l'échangeur EGR dans le même sens, c'est-à-dire sur la figure 1 de droite à gauche, mais qu'en revanche, la circulation du fluide caloporteur dans le radiateur a été inversée. En phase de démarrage, le fluide caloporteur circule de gauche à droite sur la figure 1 dans le radiateur 11. En revanche, en régime permanent, le fluide caloporteur circule de gauche à droite dans le radiateur 11 de la figure 1.When the thermostat device 13 opens the second loop 22, heat transfer fluid arrives in the third loop 23 through what was then the outlet of the radiator 11, according to the arrow referenced 25 on the figure 1 . In other words, the heat transfer fluid, maintained at a temperature close to 55° C. in the third loop, is mixed with heat transfer fluid whose temperature is close to 90°, since coming from the engine 10, and, quickly, the temperature of the fluid in the EGR exchanger becomes close to that of the fluid in the engine 10. It may be noted that after such stabilization the coolant fluid continues to circulate in the EGR exchanger in the same direction, that is to say on the figure 1 from right to left, but that, on the other hand, the circulation of the coolant in the radiator has been reversed. In the start-up phase, the heat transfer fluid circulates from left to right on the figure 1 in the radiator 11. On the other hand, in steady state, the heat transfer fluid circulates from left to right in the radiator 11 of the figure 1 .

Le radiateur 11 est donc conçu pour permettre la circulation du fluide caloporteur dans les deux sens.The radiator 11 is therefore designed to allow the circulation of the heat transfer fluid in both directions.

En référence à la figure 3, un procédé de gestion peut être mis en œuvre par le processeur 18 de la figure 1.With reference to the picture 3 , a management method can be implemented by the processor 18 of the figure 1 .

Lors d'une étape 201 on reçoit une valeur de température du liquide de refroidissement à la sortie du moteur TM, une valeur d'un paramètre state_EGR, indicatif de l'état d'un actuateur EGR, une valeur d'un paramètre de charge moteur pedal_pos et une valeur de paramètre de régime moteur regime_mot.During a step 201, a temperature value of the coolant at the engine outlet T M is received, a value of a state_EGR parameter, indicative of the state of an EGR actuator, a value of a parameter of engine load pedal_pos and an engine rpm parameter value rpm_mot.

Le paramètre state_EGR peut correspondre à la position de l'actuateur électrique lié à la gestion de l'EGR.The state_EGR parameter can correspond to the position of the electric actuator linked to the management of the EGR.

Le paramètre de charge moteur peut par exemple être une valeur de pression moyenne effective (PME) sur la pédale d'accélération.The engine load parameter can for example be a mean effective pressure value (MEP) on the accelerator pedal.

Puis au cours d'un test 202 on compare la valeur de température du liquide de refroidissement TM à une valeur seuil, par exemple 105°C ou 110°C.Then, during a test 202, the temperature value of the coolant T M is compared with a threshold value, for example 105° C. or 110° C.

Si cette valeur de température est supérieure à cette valeur seuil, et que la valeur state_EGR indique que l'échangeur EGR est hors fonctionnement, alors il est considéré que le véhicule est dans une situation de risque de surchauffe. On passe à l'étape 203 au cours de laquelle on élabore une valeur d'un signal de commande S en fonction des valeurs de paramètre pedal_pos et régime_mot. Plus précisément, une première cartographie deux dimensions, dite cartographie de refroidissement moteur, peut permettre de lire une valeur de signal de commande en fonction des valeurs de ces deux paramètres. Cette première cartographie est conçue pour, selon le point de fonctionnement du moteur, piloter le débit dans la troisième boucle de façon à refroidir relativement peu l'EGR et à utiliser les ressources du radiateur pour refroidir davantage le moteur.If this temperature value is greater than this threshold value, and the state_EGR value indicates that the EGR exchanger is out of operation, then it is considered that the vehicle is in a situation of risk of overheating. Proceeding to step 203 during which a value of a control signal S is generated as a function of the parameter values pedal_pos and régime_mot. More precisely, a first two-dimensional map, called engine cooling map, can make it possible to read a control signal value as a function of the values of these two parameters. This first map is designed to, depending on the operating point of the engine, control the flow in the third loop so as to cool the EGR relatively little and to use the resources of the radiator to further cool the engine.

Si le test 202 est négatif, c'est-à-dire si la température est en deçà de la valeur seuil, alors il est considéré que le véhicule est dans une situation de démarrage ou de fonctionnement normal, avec un risque de surchauffe limité.If test 202 is negative, that is to say if the temperature is below the threshold value, then it is considered that the vehicle is in a starting or normal operating situation, with a limited risk of overheating.

La valeur de commande de la deuxième pompe électrique est élaborée toujours en fonction des valeurs de paramètre pedal_pos et regime_mot, mais à l'aide d'une deuxième cartographie deux dimensions, différente de la première cartographie, au cours d'une étape 204.The control value of the second electric pump is still developed according to the parameter values pedal_pos and regime_mot, but using a second two-dimensional map, different from the first map, during a step 204.

Cette deuxième cartographie, dite cartographie de fiabilité, est conçue pour piloter le débit de façon à optimiser le fonctionnement de l'EGR, en particulier de façon à éviter les colmatages par amalgames.This second map, called reliability map, is designed to control the flow so as to optimize the operation of the EGR, in particular so as to avoid clogging by amalgams.

Puis, au cours d'une étape 205, la valeur de signal de commande élaborée est transmise afin de piloter la pompe électrique 17.Then, during a step 205, the command signal value generated is transmitted in order to control the electric pump 17.

Ces différentes étapes 201, 202, 205, 203 ou 204 sont répétées régulièrement. Une boucle peut être mise en place avec un test de sortie 206, par exemple un test pour vérifier que le moteur est toujours allumé, et une étape d'introduction d'un temps de latence 207, entre l'exécution de deux boucles.These different steps 201, 202, 205, 203 or 204 are repeated regularly. A loop can be set up with an output test 206, for example a test to check that the engine is still on, and a step of introducing a latency time 207, between the execution of two loops.

L'invention n'est en rien limitée par la façon dont on pilote la pompe électrique. Par exemple on pourrait prévoir de piloter la pompe uniquement en fonction de la température.The invention is in no way limited by the way in which the electric pump is controlled. For example, provision could be made to control the pump solely as a function of the temperature.

L'invention n'est pas non plus limitée à l'utilisation de cartographie pour élaborer le signal de commande, ni même à des cartographies particulières.The invention is not limited either to the use of mapping to produce the control signal, or even to particular mappings.

La cartographie de refroidissement moteur utilisée au cours de l'étape 203 peut par exemple conduire à une réduction de 30, 40 ou 50% du RCO de commande de la pompe électrique 17 lorsque le moteur relativement peu sollicité, et à une réduction de 90% de cette commande lorsque les valeurs des variables pedal_pos et regime_mot correspondent à une sur-sollicitation du moteur. Dans ce cas là, afin d'éviter la surchauffe du moteur, on peut en effet réduire le débit de la troisième boucle 23 à 10% de sa valeur maximale, afin d'envoyer davantage de fluide caloporteur refroidi par le radiateur 11 vers le moteur 10.The engine cooling map used during step 203 can for example lead to a reduction of 30, 40 or 50% of the RCO for controlling the electric pump 17 when the engine is under relatively little demand, and to a reduction of 90% of this command when the values of the variables pedal_pos and regime_mot correspond to an over-solicitation of the engine. In this case, in order to avoid overheating of the motor, it is in fact possible to reduce the flow rate of the third loop 23 to 10% of its maximum value, in order to send more heat transfer fluid cooled by the radiator 11 to the motor. 10.

La cartographie de fiabilité mise en œuvre à l'étape 204 peut également être conçue pour abaisser le débit dans la troisième boucle 23, par exemple à 40% du débit maximal de la deuxième pompe, lorsque les variables pedal_pos et regime_mot risquent de correspondent à une phase de démarrage.The reliability map implemented in step 204 can also be designed to lower the flow rate in the third loop 23, for example to 40% of the maximum flow rate of the second pump, when the variables pedal_pos and regime_mot risk corresponding to a Beginning phase.

En variante, on pourrait prévoir d'ajouter un capteur de température positionné en entrée du refroidisseur EGR. Ce capteur peut fournir des valeurs de mesure pouvant permettre de mieux discriminer les situations de démarrage, et donc de prévoir une gestion plus adaptée à ces situations de démarrage au cours desquelles la troisième boucle est isolée de la deuxième boucle.As a variant, provision could be made to add a temperature sensor positioned at the inlet of the EGR cooler. This sensor can provide measurement values that can make it possible to better discriminate start-up situations, and therefore to provide a management more suited to these start-up situations during which the third loop is isolated from the second loop.

En outre, le processeur 18 peut recevoir les valeurs lues par ce capteur et être agencé pour, lorsque ces valeurs dépassent un seuil, augmenter le débit dans la troisième boucle 23. Il convient en effet d'éviter l'ébullition du fluide caloporteur dans cette troisième boucle 23.In addition, the processor 18 can receive the values read by this sensor and be arranged to, when these values exceed a threshold, increase the flow rate in the third loop 23. It is in fact necessary to avoid the boiling of the heat transfer fluid in this third loop 23.

Claims (6)

  1. Method for the cooling management of an engine system equipped with a partial exhaust gas recirculation device by means of a cooling circuit, comprising:
    a radiator device capable of lowering the temperature of a heat transfer fluid,
    an air heater device situated inside the passenger compartment,
    an engine that is in fluid communication with the air heater device in such a way as to form a first loop for the circulation of heat transfer fluid,
    a first fluid circulation means so arranged as to cause heat transfer fluid exiting from the radiator to circulate in the engine in such a way as to form a second loop for the circulation of heat transfer fluid,
    a heat exchanger of the partial exhaust gas recirculation device, intended to cool said partial exhaust gas recirculation device, and in fluid communication with the radiator, in such a way as to form a third loop for the circulation of the heat transfer fluid,
    a second fluid circulation means intended to cause heat transfer fluid exiting from the radiator to circulate in the heat exchanger of the partial exhaust gas recirculation device,
    a decoupling device so arranged, in a first mode, as to close the second loop in such a way as to permit the circulation of heat transfer fluid only in the first loop and the third loop, and, in a second mode, as to open the second loop in such a way as to obtain circulation of heat transfer fluid in the second and the third loops at the same time,
    the method involving:
    receiving (201) at least one value of a parameter relating to the engine system (TM, status_EGR, pedal_pos, engine_speed), said at least one value of a parameter relating to the engine system comprising a temperature value (TM),
    comparing (202) the temperature value with a threshold (THR1),
    formulating (202, 203, 204) a control signal for the third loop (S) depending on said at least one received value, in such a way that
    if the temperature value (TM) is lower than the threshold (THR1), the control signal is formulated (204) in such a way as to optimize the operation of the partial exhaust gas recirculation device, and
    if the temperature value (TM) is greater than the threshold (THR1), the control signal is formulated (203) in such a way as to limit any rise in the temperature of the engine, by reducing the cooling of the partial exhaust gas recirculation device, and
    sending (205) the control signal toward the third loop in order to adapt the cooling to the engine system situation.
  2. Method according to Claim 1, wherein the control signal is sent (205) toward the second means of circulating fluid in order to control the flow generated by said second means.
  3. Device for the cooling management of an engine system equipped with a partial exhaust gas recirculation device for a cooling circuit, comprising:
    a radiator device (11) capable of lowering the temperature of a heat transfer fluid,
    an air heater device (14) situated inside the passenger compartment,
    an engine (10) that is cooled and is in fluid communication with the air heater device in such a way as to form a first loop for the circulation of heat transfer fluid (21),
    a first fluid circulation means (12) so arranged as to cause heat transfer fluid exiting from the radiator to circulate in the engine in such a way as to form a second loop for the circulation of heat transfer fluid (22) ,
    a heat exchanger (16) of the partial exhaust gas recirculation device, intended to cool said partial exhaust gas recirculation device, and in fluid communication with the radiator in such a way as to form a third loop for the circulation of the heat transfer fluid (23),
    a second fluid circulation means (17) intended to cause heat transfer fluid exiting from the radiator to circulate in the cooler of the partial exhaust gas recirculation device,
    a decoupling device (13) so arranged, in a first mode, as to close the second loop in such a way as to permit the circulation of heat transfer fluid only in the first loop and the third loop, and, in a second mode, as to open the second loop in such a way as to obtain a circulation of heat transfer fluid in the second and the third loops at the same time,
    the management device comprising:
    receiving means for receiving at least one value of a parameter relating to the engine system,
    processing means for formulating a control signal for the third loop depending on said at least one received value, in such a way as to reduce the cooling of the partial exhaust gas recirculation device, and
    transmission means for transmitting the formulated control signal toward the third loop, in order to adapt the cooling to the engine system situation,
    the device being characterized in that it comprises one or a plurality of digital processors for processing the signal, such as a microprocessor, and/or a microcontroller and a computer program product comprising instructions for performing the stages of the method of Claim 1 or 2.
  4. Engine system comprising a partial exhaust gas recirculation device, the management device (18) according to Claim 3 and the cooling circuit.
  5. Engine system according to Claim 4, wherein the coupling device includes a thermostat (13) so arranged as to open and close the second loop depending on a measured temperature value.
  6. Automobile comprising an engine system according to Claim 4 or 5.
EP13783038.6A 2012-10-31 2013-10-24 Cooling management for an engine system equipped with a partial exhaust gas recirculation device Active EP2914827B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1260398A FR2997448B1 (en) 2012-10-31 2012-10-31 COOLING MANAGEMENT OF A MOTOR SYSTEM EQUIPPED WITH A PARTIAL EXHAUST GAS RECIRCULATION DEVICE
PCT/EP2013/072221 WO2014067836A1 (en) 2012-10-31 2013-10-24 Cooling management for an engine system equipped with a partial exhaust gas recirculation device

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EP2914827A1 EP2914827A1 (en) 2015-09-09
EP2914827B1 true EP2914827B1 (en) 2022-08-24

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CN109372644B (en) * 2018-10-30 2021-12-21 潍柴动力股份有限公司 Engine thermal protection method and device

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FR2882105B1 (en) * 2005-02-14 2007-04-06 Peugeot Citroen Automobiles Sa DEVICE FOR THERMALLY REGULATING RECIRCULATED GASES OF AN INTERNAL COMBUSTION ENGINE
FR2884864B1 (en) * 2005-04-25 2010-12-10 Renault Sas DEVICE AND METHOD FOR COOLING THE ENGINE AND A VEHICLE ORGAN
FR2936566B1 (en) * 2008-09-30 2010-10-15 Renault Sas COOLING CIRCUIT FOR THE THERMAL CONTROL OF THE ENGINE INDEPENDENTLY OF OTHER CONSUMERS
SE534270C2 (en) * 2008-11-05 2011-06-21 Scania Cv Ab Arrangement for cooling of recirculating exhaust gases of an internal combustion engine
JP2010190046A (en) * 2009-02-16 2010-09-02 Denso Corp Exhaust heat recovery control device for internal combustion engine
JP2010196493A (en) * 2009-02-23 2010-09-09 Tokyo Radiator Mfg Co Ltd Cooling device for egr cooler
JP2010209736A (en) * 2009-03-09 2010-09-24 Toyota Motor Corp Engine warm-up control device
US8047184B2 (en) * 2009-07-31 2011-11-01 Ford Global Technologies, Llc EGR cooler bypass strategy
GB2473437B (en) * 2009-09-09 2015-11-25 Gm Global Tech Operations Inc Cooling system for internal combustion engines
US8615983B2 (en) * 2010-05-07 2013-12-31 GM Global Technology Operations LLC Heat exchanger method and apparatus for engine exhaust gas recirculation system
DE102010035174A1 (en) * 2010-08-23 2012-02-23 Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) Cooling system for vehicle i.e. motor car, has bypass pipe branched off from cooling circuit connected between radiator of exhaust recirculation system and heater of passenger compartment and leading into another cooling circuit
KR20120063260A (en) * 2010-12-07 2012-06-15 현대자동차주식회사 Apparatus of cooling system for vehicle and controlling method using the same

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WO2014067836A1 (en) 2014-05-08
CN104769248A (en) 2015-07-08
FR2997448B1 (en) 2018-11-09
CN104769248B (en) 2019-04-26
EP2914827A1 (en) 2015-09-09
FR2997448A1 (en) 2014-05-02

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