EP3775517A1 - Circuit de refroidissement pour un moteur à combustion interne équipé d'un circuit de recirculation de gaz d'échappement et son procédé de commande - Google Patents
Circuit de refroidissement pour un moteur à combustion interne équipé d'un circuit de recirculation de gaz d'échappement et son procédé de commandeInfo
- Publication number
- EP3775517A1 EP3775517A1 EP19711953.0A EP19711953A EP3775517A1 EP 3775517 A1 EP3775517 A1 EP 3775517A1 EP 19711953 A EP19711953 A EP 19711953A EP 3775517 A1 EP3775517 A1 EP 3775517A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooling
- loop
- temperature
- exhaust gas
- circuit
- 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.)
- Pending
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 203
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 98
- 238000010438 heat treatment Methods 0.000 claims abstract description 66
- 239000000110 cooling liquid Substances 0.000 claims abstract description 57
- 239000002826 coolant Substances 0.000 claims description 31
- 230000001276 controlling effect Effects 0.000 claims description 23
- 239000012809 cooling fluid Substances 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 241000272470 Circus Species 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 55
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000003278 mimic effect Effects 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000019577 caloric intake Nutrition 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
Classifications
-
- 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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/33—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage controlling the temperature of the recirculated gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/08—Cabin heater
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F01P2060/16—Outlet manifold
-
- 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
- F01P2070/00—Details
- F01P2070/04—Details using electrical heating elements
Definitions
- the invention relates to a cooling circuit for an internal combustion engine, in particular for a motor vehicle, equipped with an exhaust gas recirculation circuit and its control method.
- the invention more particularly relates to a cooling circuit for an internal combustion engine equipped with an exhaust gas recirculation circuit, in which is intended to circulate a cooling liquid, said cooling circuit comprising at least:
- a first cooling loop associated with the engine which comprises at least one pump, means for regulating the circulation of the cooling liquid and a cooling radiator,
- a second heating loop which is selectively connected to said first loop by said regulating means and which comprises at least one heater
- a third exhaust gas cooling loop which, associated with said exhaust gas recirculation circuit, comprises at least one heat exchanger for cooling the exhaust gases of said recirculation circuit.
- the invention also relates to a method for controlling such a cooling circuit for an internal combustion engine equipped with an exhaust gas recirculation circuit.
- Exemplary of such a cooling circuit for an internal combustion engine which is equipped with an exhaust gas recirculation circuit, commonly known as "EGR", an acronym for “Exhaust”, are known from the state of the art. Gas Recirculation "in English.
- Non-imitative manner such as an example of such a post-treatment system, a nitrogen oxide trap or a selective reduction of nitrogen oxides (NOx) catalyst.
- such an "EGR" circuit is able to take part of the exhaust gas (or combustion) of the engine and reintroduce them into the engine air intake circuit, by mixing them with the engine. fresh air admitted into the engine.
- this results in a lower emission of nitrogen oxides (NOx) in the exhaust gases of the engine, ie at the source, which subsequently makes it possible to reduce the reduction portion. NOx realized by the post-treatment system.
- NOx nitrogen oxides
- a "high pressure" exhaust gas recirculation circuit further comprises a recirculation duct, connected at one end to the exhaust flow of the engine, at a point upstream of the turbine.
- a turbocharger of the engine and at its other end to the engine intake circuit, at a point downstream of the compressor of the turbocharger.
- An EGR circuit further includes a valve, commonly referred to as an EGR valve, to control the proportion of exhaust gas that is recycled to the engine intake.
- a valve commonly referred to as an EGR valve
- the temperature of all or part of these exhaust gas recirculated is advantageously controlled using at least one heat exchanger, also called "EGR cooler".
- This lacquering phenomenon occurs more particularly in conditions of use of the engine called “low temperatures”, that is to say when the temperatures of the coolant of the engine and / or the engine. ambient air are below 0 ° C, for example between -30 ° C and 0 ° C.
- the exhaust gas recirculation circuit is traversed by exhaust gases that are not sufficiently hot (for example at a temperature below 150.degree. clean up these unburnt hydrocarbon deposits.
- lacquering phenomenon a lacquering of the EGR valve results in a bonding of the shutter of the valve (usually a valve or a flap) on its seat, which prevents the opening of the valve and thus the dosing of gases. recycled exhaust.
- the most difficult conditions are those of use at low temperatures, especially when the temperatures of the engine coolant and / or the ambient air are below 0 ° C. .
- the object of the invention is in particular to propose a new design of a cooling circuit for an internal combustion engine to solve the aforementioned drawbacks of the state of the art.
- the invention proposes a cooling circuit of the type described above, characterized in that said third exhaust gas cooling loop comprises at least one pump, heating means constituted by an immersion heater or an electric heater. adapted to heat the cooling liquid circulating in said third loop and controlled control means selectively to isolate the third loop from the rest of the cooling circuit.
- the third exhaust gas cooling loop is temporarily isolated to form a closed loop so as to raise the temperature of the cooling liquid more rapidly by means of associated heating means and independently of the rest of the cooling circuit. .
- the heat exchanger can be used more quickly to cool the part of the exhaust gases that are put in recirculation through the exhaust gas recirculation circuit equipping the engine.
- the emissions of pollutants such as nitrogen oxides (NOx) are then imitated because of the faster use of the exhaust gas recirculation circuit and this especially in low temperature conditions. in particular cold start of the engine.
- pollutants such as nitrogen oxides (NOx)
- the cooling solution reaches more quickly the first threshold temperature at which the cooling of the exhaust gas is started by the heat exchanger so that the cooling is obtained more quickly without exposing itself.
- control means of the third loop are selectively controlled between at least one closing position in which the said control means isolate the third loop from the rest of the cooling circuit so that the third loop operates in a closed loop, and an open position in which the third exhaust gas cooling loop is in communication with at least one other loop of the cooling circuit;
- control means are capable of occupying at least one intermediate position between said open and closed positions;
- the heating means of the third loop are selectively controlled between an inactive state and an active state in which said heating means heat the cooling liquid;
- the cooling circuit comprises means for measuring the temperature for measuring the temperature of the cooling liquid in the third loop as well as the first loop and / or the second loop;
- the third exhaust gas cooling loop is connected to the second heating loop
- the first cooling loop associated with the engine comprises at least a first branch, of high temperature, comprising at least the cooling radiator, and a second branch, said low temperature, comprising at least one other cooling radiator.
- the third exhaust gas cooling loop is connected to the second low temperature branch of the first cooling loop;
- the first high temperature branch and the second low temperature branch of the first cooling loop are connected to each other;
- the first high temperature branch and the second low temperature branch of the first cooling loop are independent of one another.
- the invention also proposes a method for controlling a cooling circuit of an internal combustion engine said cooling circuit comprising at least temperature measuring means capable of measuring the temperature of the cooling element in the third loop, a temperature comparator, said third loop comprising a pump, control means capable of being placed in at least one open position or in a closed position, heating means selectively controlled between an active state and an inactive state, characterized in that said control method comprises at least:
- control step which consists, when the temperature of the cooling liquid is lower than said first temperature of threshold, to control at least:
- control means in the closed position to isolate the third cooling loop from the rest of the cooling circuit
- the heating means in said active state for heating the cooling liquid to increase the temperature until at least the first temperature is reached;
- control method comprises at least one control step consisting, when the temperature of the cooling liquid is at least equal to the first temperature of the temperature, in controlling the circulating flow of the exhaust gas the engine to establish a circulation desd its exhaust gases through the heat exchanger of the third loop to cool the recirculating exhaust gas;
- the control method comprises a control step of controlling at least the heating means in the inactive state to stop heat the cooling liquid;
- the control method comprises a control step of controlling at least the heating means in the active state to continue to heating the cooling liquid for a specified period of time or until the temperature of the coolant reaches a given value, such as a second threshold temperature above the first temperature;
- the control method comprises a control step of at least controlling the control means in an intermediate position; between the said full open and closed positions to bring the third cooling loop partially in communication with at least one other loop of the cooling circuit having a cooling liquid;
- the control method comprises a control step of at least controlling the control means in position; opening to fully bring the third cooling loop into communication with at least one other loop of the cooling circuit.
- FIG. 1 is a diagrammatic view showing a first embodiment of a cooling circuit according to the invention comprising respectively a first cooling loop of the motor, a second heating loop and a third cooling loop. exhaust gases of an EGR circulating motor and illustrating, with the engine stopped, a circu it in which the third loop of cooling of the exhaust gas is selectively connected by means control at the second heating loop;
- FIG. 2 is a schematic view showing the cooling circuit according to FIG. 1 during a first operating phase corresponding to a cold start in low temperature conditions and which illustrates the control means of the third an exhaust gas cooling loop in a closed position in which said third loop is isolated from the remainder of the cooling circuit to operate in a closed loop to accelerate the temperature rise of the cooling die, said cooling fluid passing through the heat exchanger being circulated by the pump and heated by the associated heating means until at least a first threshold temperature is reached from which starts a second operating phase in which a circulation exhaust gas is established through the heat exchanger for cooling with the aid of the cooling liquid;
- FIG. 3 is a schematic view showing a cooling circuit according to FIG.
- FIG. 4 is a schematic view showing a cooling circuit according to FIG. 1 during a fourth operating phase during which the cooling liquid of the third exhaust gas cooling loop is at a higher temperature; at the second threshold temperature and which illustrates the control means of the third loop occupying an open position in which said third loop is fully in communication with the second heating loop of the cooling circuit;
- FIG. 5 is a graph which, for the first embodiment, represents on the ordinate the temperature (in degrees Celsius: ° C) of the coolant as a function of time (in seconds: s) is plotted on the abscissa and which respectively illustrates by a curve (CEGR) the evolution of the coolant temperature in the third cooling loop, by a curve (CMOT) the change in the temperature of the coolant in the first cooling loop and the opening progressive valve forming the regulating means of the third loop;
- FIG. 6 is a schematic view showing a second embodiment of a cooling circuit according to the invention in which the third exhaust gas cooling loop is connected to a second low temperature branch of the first cooling loop and illustrating another implementation of the third exhaust gas cooling loop than that of the first embodiment of FIGS. 1 to 4;
- FIG. 7 is a diagrammatic view that represents a variant embodiment of the cooling circuit according to the second embodiment of FIG. 6 in which the first high temperature branch and the second low temperature branch of the first heating loop. Engine-related cooling is independent of each other.
- FIGS. 1 to 4 show an example of a cooling circuit 10 for an internal combustion engine 12, especially a motor vehicle, in which a cooling fluid is intended to be selectively circulated.
- the cooling circuit 10 is equipped with an exhaust gas recirculation circuit (not shown), commonly known as EGR circulation.
- cooling liquid should be interpreted broadly as referring to a coolant fluid that can be used not only to cool but also to heat up while realizing calorie intake.
- the cooling circuit 10 comprises at least a first cooling loop 14 which is associated with the internal combustion engine 12.
- the first cooling loop 14 comprises at least one pump 16 for circulating the cooling liquid in the cooling circuit.
- the first cooling loop 14 comprises at least a first pipe 18 which is connected to the internal combustion engine 12 to ensure cooling during its operation.
- the pump 16 is arranged in said first pipe 18, upstream of the internal combustion engine 12.
- the first cooling loop 14 comprises regulation means 20 for controlling the circulation of the cooling liquid, in particular as a function of operating parameters. of the engine 12.
- the means 20 for regulating the first cooling loop 14 is a thermostat (or thermostatic valve).
- the thermostat is for example of the passive type, that is to say controlled in opening by the coolant when a given threshold temperature is reached.
- the thermostat is controlled so that it can be controlled in opening for more than one threshold temperature.
- the regulation means 20 are arranged at the junction of the first pipe 18 with a second pipe 22 in which is arranged a cooling radiator 24.
- the first cooling loop 14 comprises a bypass line 26, said bypass, said bypass line 26 being connected to the second pipe 22 respectively upstream and downstream of the radiator 24 cooling.
- the branch pipe 26 comprises a jar 28 degassing.
- the cooling circuit 10 comprises a second heating loop 30 comprising at least one main duct 32 in which is arranged a heater 34.
- the second heating loop 30 is connected selectively to the first first loop 14, in particular via the regulation means 20.
- the main pipe 32 of the second heating loop 30 is connected to the first pipe 18 of the first loop 14, respectively to the level of the regulation means 20 formed by the thermostat and upstream of the pump 16.
- the second heating loop 30 comprises at least a first pipe 36 and a second pipe 38 of the iaison with a third loop 40 for cooling the exhaust gas.
- the third exhaust gas cooling loop 40 is associated with the circu it (not shown) of exhaust gas recirculation equipping the engine 12.
- the third exhaust gas cooling loop 40 comprises at least one heat exchanger 42 for cooling the exhaust gases of said recirculation circuit.
- the third exhaust gas cooling loop 40 comprises at least one pump 44 and heating means 46 able to heat the cooling liquid flowing in said third loop.
- the pump 44 of the third loop 40 is selectively controlled between a standby state and a running state in which the pump 44 circulates the cooling liquid at least in the third exhaust gas cooling loop 40. .
- the means 46 for heating the third exhaust gas cooling loop 40 are selectively controlled between an inactive state and an active state in which said heating means 46 heat the cooling liquid.
- the heating means 46 is intended to transfer calories to the cooling liquid of the third loop 40 so as to increase the temperature thereof.
- the heating means 46 it is possible to accelerate the rise in temperature of the cooling l id and thereby make it possible to use the heat exchanger 42 more rapidly to cool at least part of the exhaust gases. recirculated through the EGR circulation.
- the means 46 for heating the third loop 40 are for example selected from a list comprising means such as an immersion heater, an electric heater, an energy storage jar.
- the heating means 46 of the third loop 40 comprise at least one immersion heater.
- the means 46 for heating the third loop 40 may however be constituted by any source capable of transferring calories to the cooling liquid.
- the means 46 for heating could also be constituted by a heat recovery device of the type "EH RS” acronym for (“Energy Recovery Heat System”) in English.
- the third exhaust gas cooling loop 40 has control means 48 which are selectively controlled to isolate the third loop 40 from the rest of the cooling circuit 10, particularly with respect to the part at which the third loop 40 is connected.
- the control means 48 for controlling the third loop 40 are selectively controlled between at least:
- control means 48 are capable of occupying at least one intermediate position between the said opening and closing positions.
- control means 48 consist of at least one valve, such as a three-way valve.
- control means 48 are capable of successively occupying several intermediate positions in order to progressively establish communication between the third loop 40 and the cooling circuit 10 after the third loop 40 has been isolated in order to operate. in closed loop.
- control means 48 are constituted by a thermostat, controlled or not in opening, or any other equivalent control means.
- the cooling circuit 10 comprises temperature measuring means for measuring the temperature of the cooling liquid in the third loop 40 and in the first loop 14 and / or the second loop 30.
- the third exhaust gas cooling loop 40 comprises temperature measuring means 50, such as at least one sensor, for measuring the temperature of the cooling fluid circulating in said third loop 40.
- the means 50 for measuring temperature associated with said third loop 40 are arranged upstream of the heat exchanger 42 along the direction of circulation of the cooling liquid.
- the cooling circuit 1 0 comprises means 52 for measuring temperature, such as at least one sensor, for measuring the temperature of the cooling liquid in at least one of the first and second loop desd ites.
- the means 52 for measuring temperature are arranged in the first conduit 18, downstream of the engine 1 2.
- the means 52 for measuring the temperature are able to measure the temperature of the cooling liquid circulating in the first reactor 18 which is connected on the one hand to the second heating loop 30 and, on the other hand, selectively at the first cooling loop 14 depending on the position of the control means 20.
- the third exhaust gas cooling loop 40 is selectively connected to the second heating loop 30 through said first condensate 36 and the second condensate conduit 38.
- the third exhaust gas cooling loop 40 is intended to operate either in a closed loop or an open loop when said third loop 40 is in total or partial communication with the second heating loop 30.
- the invention also relates to a method for controlling a cooling circuit 10 for an internal combustion engine 12 with an EGR circulating circuit.
- FIGS. 2 to 4 certain parts of the cooling circuit 10 have been shown with a thicker line in order to facilitate understanding by illustrating the circulation of the cooling element during the different operating phases.
- the most critical operating conditions correspond to use at low temperatures when the outside temperature and / or that of the coolant is below 0 ° C.
- the control method comprises at least one step of comparing the temperature T of the cooling solution with a first threshold temperature TS1, preferably the temperature T of the coolant of the third cooling loop 40.
- the value of the second threshold temperature TS1 is approximately 20 ° C.
- the temperature T of the coolant is measured elsewhere in the cooling circuit.
- the temperature T of the cooling fluid of the third cooling loop 40 is advantageously determined by the means 50 for measuring the temperature.
- the first temperature TS1 is a reference temperature from which the heat exchanger 42 is used to cool the exhaust gases of said exhaust gas recirculation circuit.
- control means 48 are then controlled in the open position and the circulating circuit EGR so that the heat exchanger 42 the third loop 40 is traversed by the exhaust gas recirculation to cool them.
- the heat exchanger 42 of the third loop 40 is not used to cool the cooling gases. 'exhaust. This will also be the case in the low temperature, typically winter conditions, the heat exchanger 42 then not being preferentially used to cool the exhaust gas EGR circuit.
- the amount of pollutants, and especially nitrogen oxides (NOx) emitted by the engine 12 is higher than that obtained when the Heat exchanger 42 is used to cool the exhaust gas.
- the invention proposes to accelerate the rise in temperature of the cooling fluid circulating in the third cooling loop 40 in order to be able to use the heat exchanger 42 and thus the EGR circuit more rapidly so as to reduce emissions of nitrogen oxides (NOx).
- NOx nitrogen oxides
- the control method comprises a control step of controlling at least the control means 48 in the closed position.
- Controlling the control means 48 in the closed position has the consequence of isolating the third cooling loop 40 from the rest of the cooling circuit 10.
- the heating means 46 are then controlled in an active state to heat the cooling liquid to increase the temperature T until it reaches at least the first threshold temperature TS1.
- the pump 44 is controlled in a running state to ensure a circulation of the cooling liquid in the third cooling loop 40 which operates in a closed loop.
- the third loop 40 is temporarily isolated to form a closed loop so as to accelerate the rise in temperature of the cooling liquid through the heating means 46.
- the calories delivered by the heating means 46 are used solely for heating the cooling liquid of the third loop 40, independently of the rest of the cooling circuit 10.
- the heat exchanger 42 can be used more quickly to cool the exhaust gas recirculated through the exhaust gas recirculation circuit equipping the motor 1 2.
- the exhaust gas recirculation circuit is then also used more quickly, which is accompanied, according to the desired purpose, a imitation of pollutant emissions such as nitrogen oxides (NOx).
- pollutant emissions such as nitrogen oxides (NOx).
- the valve forming the control means 48 being in the closed position, the curve Cv corresponding to the percentage (%) of opening of the valve is at a zero value, equal to zero.
- the temperature of the cooling liquid in the third cooling loop 40 will increase until at least the first temperature TS1 is reached.
- the control method comprises at least a step of controlling the exhaust gas recirculation circuit Equipping the engine 12 to establish a circulation of its exhaust gas through the heat exchanger 42 of the third loop 40 to cool the exhaust gas recirculation.
- the control method comprises a control step of controlling at least the heating means 46 in an inactive state.
- the cooling liquid then ceases to be heated with the heating means 46.
- the temperature T of the cooling liquid will continue to increase because the exhaust gas cooled in the heat exchanger 42 then transfer calories to it.
- the control method comprises a control step of keeping the heating means 46 in an active state.
- the cooling liquid is then heated with the heating means 46, for example for at least a predetermined period of time or until the temperature of the cooling liquid reaches a given value.
- the value given is that of a second temperature of only TS2.
- the cooling fluid of the third loop 40 is then respectively heated by the heating means 46 and by the exhaust gases of the EGR circuit which pass through the heat exchanger 42 to be cooled.
- the cooling circuit 10 starts a third phase of operation when the temperature T of the cooling liquid is at least equal to a second threshold temperature TS2.
- the value of the second threshold temperature TS2 is approximately 50 ° C.
- control method then preferably comprises a control step of controlling at least the control means 48 in at least one intermediate position to put the third cooling loop 40 partially in communication with one another. with at least one other loop of the cooling circuit 10.
- the third cooling loop 40 is gradually brought into communication with the second heating loop 30.
- the cooling fluid of the third loop 40 mixes with the cooling liquid of the second heating loop 30.
- the temperature of the cooling fluid of the second heating loop 30 is lower than the temperature of the cooling liquid of the third loop 40, ie lower than said second threshold temperature TS2.
- the cooling fluid of the third loop 40 will therefore transfer, to the second heating loop 30 comprising the heater 34, the calories absorbed through the heat exchanger 42 during cooling of the exhaust gas EGR circuit.
- the increase in the temperature of the cooling cylinder is beneficial for the engine 12 in terms of consumption because it helps to reduce friction and is likely to provide thermal comfort in case of demand.
- control means 48 are controlled to partially open and allow a progressive circulation through the first conduction 36 of the Iaison, the third loop 40 to the second heating loop 30.
- the temperature T of the cooling liquid continues to grow.
- control method then comprises a control step consisting of controlling the control means 48 in the open position to completely bring the third cooling loop 40 in fluid relation with at least one other loop of the cooling circuit.
- the cooling fluid circulating in the third exhaust gas cooling loop 40 is then circulated in the remainder of the cooling circuit 10 so that its rise in temperature continues with the operation of the engine 12.
- the operation of the cooling circuit 10 is carried out conventionally with, when the temperature of the cooling liquid reaches a given value, the opening of the regulating means 20 to ensure a circulation of the liquid of cooling through at least the cooling radiator 24.
- FIG. 6 shows a second embodiment of a cooling circuit 10 according to the invention.
- the cooling circuit 10 comprises a first cooling loop 14 associated with the motor 12 which differs from that of the first embodiment.
- the first cooling loop 14 associated with the motor 12 comprises at least a first branch 14A, said high temperature (similar to the first cooling loop described above), and further comprises a second branch 14B, said low temperature.
- high temperature designates a part of the cooling circuit in which the coolant circulates at a temperature which is higher than that of the coolant circulating in another part of the cooling circuit, then qualified by comparison of "low temperature”.
- the first branch 14A comprises at least the radiator 24 cooling, said high temperature radiator (or HT).
- the second branch 14B comprises at least one other radiator 54 cooling, said low-temperature radiator (or BT).
- the third exhaust gas cooling loop 40 is here connected to the second low temperature branch 14B of the first cooling loop 14.
- the second branch 14B low temperature comprises at least one pipe 56 in which is arranged the radiator 54 cooling.
- the pipe 56 is connected at one end, downstream, to the third cooling loop 40, preferably at the level of the control means 48.
- the first branch 14A high temperature and the second branch 14B low temperature of the first loop 14 are connected, fluently connected to one another.
- the pipe 56 is connected at the other end, upstream, to the second pipe 22 of the first high temperature branch 14A, preferably downstream of the high temperature cooling radiator 24.
- the third exhaust gas cooling loop 40 is connected to the remainder of the cooling circuit 10 via the pipe 56 communicating with the second leg 14B on the one hand and by a pipe 58 on the other hand.
- the pipe 58 is connected to the second pipe 22 of the first branch 14A of the first cooling loop 14.
- the pipe 58 is the one through which the return of the cooling liquid, when the third loop 40 does not work in a closed loop.
- the operating phases of the third exhaust gas cooling loop 40 in this second embodiment are similar to those described for the first embodiment.
- the first embodiment illustrated in FIGS. 1 to 4 and the second embodiment of FIG. 6 are non-imitative examples of implementation of an exhaust gas cooling loop associated with a circulating EGR of FIG. a motor 1 2 to internal combustion.
- FIG. 7 shows a variant of real isation of the second embodiment which has just been described.
- the first high temperature branch 14A and the second low temperature branch 14B of the first cooling loop 14 are here independent of each other.
- a portion of the pipe 56 connects the input of the radiator 54 cooling low temperature to the third loop 40 tand is that the other party connects as previously the output of the radiator 54 to the third loop 40, here at the level of the control means 48.
- the maximum temperature reached by the cooling fluid circulating in the second low temperature branch 14B of the first loop 14 and in the third loop 40 will advantageously be less than the maximum temperature that can be reached by the coolant liquid in the first branch 14A high temperature.
- the invention proposes a cooling circuit 10 for an internal combustion engine 12 equipped with an exhaust gas recirculation circuit, comprising at least a first cooling loop 14 associated with the engine 12. a second heating loop 30 which comprises at least one heater 34, and a third exhaust gas cooling loop 40 which comprises at least one heat exchanger 42 for cooling the exhaust gases from the recirculation circuit circuit 10 wherein said third exhaust gas cooling loop 40 comprises at least one pump 44, heating means 46 for selectively heating the cooling fluid flowing in said third loop 40 and control means 48 selectively controlled to isolate the third loop 40 from the remainder of the cooling circuit 10, and a method of controlling such a circuit uit 10 of cooling.
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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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1852647A FR3079558B1 (fr) | 2018-03-27 | 2018-03-27 | Circuit de refroidissement pour un moteur a combustion interne equipe d'un circuit de recirculation de gaz d'echappement et son procede de commande |
PCT/EP2019/057644 WO2019185663A1 (fr) | 2018-03-27 | 2019-03-26 | Circuit de refroidissement pour un moteur à combustion interne équipé d'un circuit de recirculation de gaz d'échappement et son procédé de commande |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3775517A1 true EP3775517A1 (fr) | 2021-02-17 |
Family
ID=62092146
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19711953.0A Pending EP3775517A1 (fr) | 2018-03-27 | 2019-03-26 | Circuit de refroidissement pour un moteur à combustion interne équipé d'un circuit de recirculation de gaz d'échappement et son procédé de commande |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3775517A1 (fr) |
FR (1) | FR3079558B1 (fr) |
WO (1) | WO2019185663A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020115018A1 (de) * | 2020-06-05 | 2021-12-09 | Volkswagen Aktiengesellschaft | Kühlkreislaufanordnung einer Verbrennungskraftmaschine |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6321697B1 (en) * | 1999-06-07 | 2001-11-27 | Mitsubishi Heavy Industries, Ltd. | Cooling apparatus for vehicular engine |
FR2895450B1 (fr) * | 2005-12-28 | 2008-03-07 | Renault Sas | Disositif de gestion thermique pour vehicule automobile |
FR2914694A1 (fr) * | 2007-04-05 | 2008-10-10 | Renault Sas | Systeme de gestion des echanges thermiques d'un moteur de vehicule automobile |
SE532709C2 (sv) * | 2008-03-06 | 2010-03-23 | Scania Cv Ab | Kylarrangemang hos en överladdad förbränningsmotor |
SE535877C2 (sv) * | 2010-05-25 | 2013-01-29 | Scania Cv Ab | Kylarrangemang hos ett fordon som drivs av en överladdad förbränningsmotor |
-
2018
- 2018-03-27 FR FR1852647A patent/FR3079558B1/fr active Active
-
2019
- 2019-03-26 EP EP19711953.0A patent/EP3775517A1/fr active Pending
- 2019-03-26 WO PCT/EP2019/057644 patent/WO2019185663A1/fr unknown
Also Published As
Publication number | Publication date |
---|---|
FR3079558B1 (fr) | 2023-11-03 |
WO2019185663A1 (fr) | 2019-10-03 |
FR3079558A1 (fr) | 2019-10-04 |
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