EP1264086B1 - Procede et dispositif de refroidissement d'un moteur de vehicule automobile - Google Patents

Procede et dispositif de refroidissement d'un moteur de vehicule automobile

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Publication number
EP1264086B1
EP1264086B1 EP01907697A EP01907697A EP1264086B1 EP 1264086 B1 EP1264086 B1 EP 1264086B1 EP 01907697 A EP01907697 A EP 01907697A EP 01907697 A EP01907697 A EP 01907697A EP 1264086 B1 EP1264086 B1 EP 1264086B1
Authority
EP
European Patent Office
Prior art keywords
temperature
engine
coolant
branch
vehicle
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.)
Expired - Lifetime
Application number
EP01907697A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1264086A1 (fr
Inventor
Armel Le Lievre
Ludovic Tomasseli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1264086A1 publication Critical patent/EP1264086A1/fr
Application granted granted Critical
Publication of EP1264086B1 publication Critical patent/EP1264086B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/143—Controlling of coolant flow the coolant being liquid using restrictions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
    • 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
    • F01P2023/00—Signal processing; Details thereof
    • 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
    • F01P2025/08—Temperature
    • 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
    • F01P2025/08—Temperature
    • F01P2025/13—Ambient temperature
    • 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
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/62—Load
    • 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
    • F01P2025/64—Number of revolutions
    • 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
    • F01P2025/66—Vehicle speed
    • 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
    • F01P2060/02—Intercooler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/04—Lubricant cooler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • F01P7/048—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using electrical drives
    • 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
    • F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed

Definitions

  • the invention relates to a method and a cooling device of a motor vehicle engine.
  • the invention more particularly relates to a cooling device comprising a hydraulic coolant coolant circuit, associated with a circulation pump thereof through the vehicle engine and different branches of the circuit.
  • Thermal equipment of the vehicle can be arranged in the different branches of the circuit.
  • the cooling systems are designed to ensure that the motors withstand the thermomechanical stresses resulting from combustion.
  • complementary functions are implemented in addition to the main cooling of the engine, to improve the overall efficiency or to offer and guarantee services to vehicle users, such as, for example, the heating of the passenger compartment.
  • the cooling systems are dimensioned from the operating points at maximum speed and full load of the engine and are therefore oversized in most cases of use of vehicles.
  • the operating parameters of the engine are not optimized, which results in a degradation of the performance of the latter, such as increased consumption, a high level of pollutant emission and a reduction in the thermal and acoustic comfort of the engine. vehicle.
  • FR-A- 2,456,838 discloses a method and a cooling device of a motor vehicle engine, of the type comprising a hydraulic fluid coolant circuit, associated with a pump 2 for circulation thereof through the engine of the vehicle and different branches of the circuit, in which thermal equipment of the vehicle is arranged, at least some of the branches of the circuit being provided with electronically controlled actuators for regulating the circulation of the fluid therein, the device comprising acquisition means information relating to the operating conditions of the vehicle, connected to means for electronically controlling the operation of the actuators, for regulating the volume and the flow rate of fluid circulating in the hydraulic circuit in order to optimize the operation of the engine, the circuit comprising a branch 8 provided with an actuator 6 controlled and provided with means 3 forming a radiator, the means of ac quisition of information being able to determine the temperature of the cooling fluid, so that when the temperature of the fluid is greater than a threshold temperature of 95 ° C determined from which the engine is said "hot", the means of control regulate the flow rate in the radiator branch so as to maintain the temperature of
  • the document EP557113 describes a cooling system of an engine comprising, a heat transfer fluid loop connected to a radiator, and means for regulating the flow of the liquid in this loop.
  • the flow control means are slaved to the operating conditions of the vehicle, in particular by means of sensors the temperature of the liquid located in different parts of the loop.
  • the flow of the coolant in the radiator loop is controlled in particular to regulate the temperatures of the liquid at the outlet and at the inlet of the engine around respective set values.
  • this system has a complex structure and uses a large number of measured state variables, without optimizing heat exchanges with the coolant.
  • An object of the present invention is to provide a method of cooling a motor vehicle engine, overcoming all or part of the disadvantages of the prior art noted above.
  • a method of cooling a motor vehicle engine consisting in regulating the volume and the flow rate of a coolant in a hydraulic circuit (2) provided with a branch (4) provided with an actuator (14) electronically controlled and provided with means (9) forming a radiator, the method comprising a first step of determining the temperature (T) of the cooling fluid, a step of comparing this temperature with a threshold temperature (T2) determined from which the motor (1) is said to be "hot", and, when the temperature (T) of the fluid is greater than the threshold temperature (T2), the flow rate in the radiator branch (4) is regulated in such a way that to maintain the temperature (T) of the coolant around a set value (Tc) determined, the curve representative of the opening (0) of the thermostatic valve (4) as a function of the temperature (T) of the fluid of remindssem ent having a hysteresis (h1, h2) around the set temperature (Tc1, Tc2), so as to regulate the temperature (T) of the coolant at said
  • Another object of the present invention is to provide a cooling device of a motor vehicle engine, overcoming all or part of the disadvantages of the prior art noted above.
  • a cooling device of a motor vehicle engine of the type comprising a hydraulic circuit (2) of coolant, associated with a pump (3) for circulating it through the engine (1).
  • a hydraulic circuit (2) of coolant associated with a pump (3) for circulating it through the engine (1).
  • thermal equipment (9, 10, 11, 12, 13, 140, 150, 160) of the vehicle are arranged, less some of the branches (4, 5, 6, 7, 8, 44) of the circuit (2) being provided with electronically controlled actuators (14, 15, 16, 17, 18, 29) for regulating the circulation of the fluid in those
  • the device comprising means (22) for acquiring information relating to the operating conditions of the vehicle, connected to means (19) for controlling the operation of the actuators (14, 15, 16, 17, 18, 29 ), to regulate the volume and the flow rate of circulating fluid in the hydraulic circuit (2) in order to optimize the operation of the engine (1)
  • the circuit (2) comprising a branch (4) provided with an actuator (14) controlled electronically and provided with means (9) forming a radiator, the means (22) for acquiring information being able to determine the temperature (T) of
  • FIG. 1 represents a preferred embodiment of a cooling device according to the invention.
  • the cooling device comprises a hydraulic circuit 2 containing a cooling heat transfer fluid.
  • a hydraulic pump 3 is associated with the circuit 2, to ensure the circulation of the fluid through the motor 1 and different branches 4, 5, 6, 7, 8, 44 of the circuit 2.
  • the pump 3 is a pump of the type mechanical, however, the use of an electric pump can also be considered.
  • the branches 4, 5, 6, 7, 8, 44 of the circuit 2 are supplied with cooling liquid from a housing 122, or "water outlet housing” (BSE).
  • BSE water outlet housing
  • the housing 122 which is fixed to the engine 1, and preferably to the cylinder head of the engine 1, collects the coolant having circulated in the engine 1.
  • the coolant circulating in the branches is recovered by a water inlet manifold 23 before its recirculation in the engine 1.
  • the branches 4, 5, 6, 7, 8, 44 of the circuit 2 are provided with respective electronically controlled actuators 14, 15, 16, 17, 18, 29 for regulating the circulation of the fluid in these this.
  • the electronically controlled actuators may be, for example, solenoid valves or electrically controlled thermostatic valves, that is to say controlled thermostats.
  • the device comprises means 22 for acquiring information relating to the operating conditions of the vehicle.
  • the means of acquisition are connected to means 19 for controlling the operation of at least a portion of the actuators 14, 15, 16, 17, 18, 29 to regulate the volume and the flow rate of circulating fluid in the hydraulic circuit 2 so as to optimize the engine operation.
  • the control means 19 or information processing unit may comprise any appropriate computer 20, such as, for example, an "Intelligent Service Enclosure" (BSI) of known type.
  • the computer 20 is associated with information storage means 21 comprising, for example, a programmable memory and / or a read-only memory.
  • the computer 20 is also connected to means 22 for acquiring information relating to the operating conditions of the vehicle, comprising, for example, various sensors or other computers such as an engine control computer.
  • the information acquisition means 22 are able to determine at least one of the following parameters: the engine speed, the engine torque, the vehicle speed, the temperature of the engine lubricating oil , the engine coolant temperature, the engine exhaust temperature, the outside air temperature of the vehicle and the temperature inside the passenger compartment.
  • the various information relating to the operating conditions of the vehicle are processed and analyzed by the computer 20, to control the operation of the actuators 14, 15, 16, 17, 18, 29 and possibly that of the pump 3.
  • the flow rate or volume of coolant admitted or not to circulate in the different branches 4, 5, 6, 7, 8, 44 of the circuit 2 is a function of the heating state of the engine 1.
  • the thermal state of the engine 1 is characterized as a function of the temperature T of the coolant, preferably at the output of the engine 1.
  • T 1 a first threshold temperature
  • T 2 a second threshold temperature
  • the state of the engine 1 is said to be hot.
  • the state of the engine 1 is said intermediate.
  • the first T 1 and / or the second T 2 threshold temperature may be fixed or variable values determined according to the type of the engine 1.
  • the first T 1 and / or the second T 2 threshold temperature are variables depending of the type of the engine 1 and at least one operating parameter of the engine 1.
  • the first T 1 and / or the second T 2 threshold temperatures are functions of the average power P m supplied by the engine 1. that is, the control means 19 cooperate with the acquisition means 22 to calculate the instantaneous average power Pm supplied by the engine 1.
  • the control means 19 then calculate the first T 1 and / or the second T 2 threshold temperature, as a function of the instantaneous mean power Pm and a determined modeling of the operation of the engine 1.
  • the engine modeling defines the cold states, hot and intermediate (first T 1 and second T 2 threshold temperatures) depending on the average power Pm provided by the latter.
  • the values of the speed N and the torque C can be measured by the data acquisition means 22, that is to say -say by appropriate sensors.
  • the engine speed N is between 0 and 6000 rpm. approximately, while the torque C is between 0 and 350 Nm approximately.
  • the control means 19 then calculate the power P (t) supplied by the engine at time t and the average power Pm (t) supplied by the engine at time t.
  • Pm ( t - 1 ) + k P ( t ) vs + k Pm (t-1) is the mean power at time (t-1)
  • P (t) is the instantaneous power at time t
  • c and k are weighting coefficients.
  • the computer 19 and / or the information storage means 21 may contain the modeling of the operation of the engine 1, defining its cold, hot and intermediate state (first T 1 and second threshold temperatures T 2 ) as a function of the average power Pm. That is to say that for a given type of engine, one establishes empirically and / or by calculation of the tables of correspondence giving the threshold temperatures T 1 and T 2 according to the average power Pm of the engine 1. These tables or modelizations, which depend on the type of motor, are for example polynomial functions.
  • the first threshold temperature T 1 is thus, in general, a decreasing function of the average power.
  • the first threshold temperature T 1 can vary between about 20 and 60 degrees, and preferably between 30 and 50 degrees.
  • the second threshold temperature T 2 may vary for its part between 60 and 100 degrees approximately. However, the second threshold temperature T 2 is generally substantially constant around the value of 80 degrees.
  • control means 19 cooperate with the data acquisition means 22 to compare the temperature T of the coolant with the two threshold temperatures T 1 and T 2 .
  • the value of the first threshold temperature T 1 can be fixed by the control means 19 as soon as the measured temperature T of the coolant reaches the first threshold temperature T 1 .
  • FIG. 2 illustrates, on the same graph, an example of variation over time t: of the temperature T of the coolant, and of the first threshold temperature T 1 (Pm), which is a function of the average power .
  • the circuit comprises a branch 4 provided with an electronically controlled actuator 14 and provided with means 9 forming a radiator.
  • the radiator means 9 can be coupled to a fan motor unit 30, which can also be controlled by the control means 19.
  • the information acquisition means 22 determine the temperature T of the cooling fluid, so that when the latter is greater than the second threshold temperature T 2 , the control means 19 regulate the flow in the radiator branch 4 so as to maintain the temperature T of the coolant around a setpoint value Tc determined.
  • the set temperature Tc is the temperature of the coolant ensuring optimum operation of the engine 1.
  • This setpoint temperature Tc is defined, for example, by modeling the engine concerned.
  • the set temperature Tc is, for example, between 60 and 120 degrees, and preferably between 80 and 100 degrees.
  • control means 19 cooperate with the information acquisition means 22 for determining the target temperature Tc as a function of the speed N and / or the torque C of the engine 1.
  • the target temperature Tc decreases when the torque C of the motor 1 increases.
  • the setpoint temperature Tc decreases when the speed N of the motor 1 increases.
  • FIG. 3 illustrates an exemplary curve representative of the variation of the setpoint temperature Tc as a function of the torque C of the motor, at constant speed N.
  • the curve representative of the variation of the set temperature Tc as a function of the torque C at constant speed N may have a general appearance comparable to that of the curve of FIG.
  • the actuator 14 of the radiator branch 4 may consist of a thermostatic valve that can be controlled electronically.
  • the valve 14 may contain a member adapted to expand or retract, to regulate the degree of opening of the valve according to its temperature.
  • the expandable member may also be electrically heated to control the opening and closing of the valve in real time.
  • FIG. 4 represents two examples of variation of the% O opening percentage of the thermostatic valve 14 of radiator as a function of the temperature T of the coolant.
  • FIG. 4 illustrates two examples of regulation of the temperature T of the coolant around two different temperature Tc1, Tc2 respectively.
  • the opening curve O of the thermostatic valve 14 has a first hysteresis h1 around the first setpoint temperature Tc1 and a second hysteresis h2 around the second setpoint temperature Tc2.
  • the sequencing of the closing phases F1, progressive opening F2, opening F3, and progressive closing F4 of the valve 14 is symbolized by arrows.
  • the first setpoint temperature Tc1 may correspond, for example, to a phase of high load on the motor, while the second setpoint temperature Tc2, which is higher, may correspond to a lower load on the motor.
  • the actuator 14 of the radiator branch 4 may consist of an electronically controlled proportional valve.
  • the control means 19 can increase the opening of the valve. 14 proportional.
  • the control means 19 can reduce the opening of the valve 14 proportional.
  • control means 19 can cooperate with the information acquisition means 22 to determine the temperature Ta of the intake air of the engine 1 and to increase the flow rate of the cooling fluid in the radiator branch 4 when the temperature Ta of the air intake of the engine 1 increases beyond a first threshold S1 determined.
  • control means 19 can provide a maximum flow rate in the radiator branch 4 when the temperature Ta of the intake air of the engine 1 reaches a determined second threshold S2.
  • the first S1 and second S2 temperature thresholds for the intake air can be of the order of 40 degrees and 60 degrees respectively.
  • FIG. 5 represents an example of variation of the pulse or electric intensity I of control of the radiator valve 14, as a function of the temperature Ta of the intake air of the engine, at speed N, torque C and speed of the constant vehicle.
  • I1 designates the electric pulse delivered to the actuator 14 (proportional solenoid valve or thermovalve) for a given setpoint temperature Tc1.
  • This electrical pulse I1 which is between 0 and 100% of the maximum pulse, defines a determined partial opening of the actuator 14.
  • the Electrical pulse 1 delivered to the actuator 14 tends to I1.
  • the electric pulse I delivered to the actuator 14 increases and tends towards the maximum pulse (100%), that is to say to a total opening of the valve 14. This means that, for a given setpoint temperature Tc defining a given flow rate in the radiator branch 4, the increase in the intake temperature Ta can generate an increase in flow, even when the setpoint temperature Tc does not vary.
  • control means 19 can cooperate with the information acquisition means 22 for determining the speed of the vehicle, so as to increase the speed of the vehicle. flow in said branch 4 when the speed of the vehicle increases beyond a first determined threshold.
  • control means 19 can provide a maximum flow in the radiator branch 4 when the speed of the vehicle reaches a second determined threshold.
  • the variation curve of the pulse or electrical intensity 1 for controlling the radiator valve 14 as a function of vehicle speed may have a general appearance similar to that of the curve of FIG. 5.
  • the first and second vehicle speed thresholds may be of the order of half the maximum permitted speed and the maximum speed, respectively.
  • the circuit 2 comprises another branch 5 provided with an electronically controlled actuator 15 and associated with means 10 forming a direct return of fluid or bypass.
  • the control means 19 can regulate the circulation of the cooling fluid in the bypass branch 5 as a function of the temperature T of this fluid.
  • the quantity of fluid allowed to circulate in the bypass branch 5 increases as the temperature of the fluid increases from the first T 1 to the second threshold temperature T 2 .
  • the electronically controlled actuator 15 of the bypass branch is of the proportional type.
  • the control means 19 can limit the flow of fluid in the bypass branch 5 to a determined leakage rate. That is, the actuator 15 of the bypass branch 5 is partially open Of. For example, the partial opening Of of the actuator 15 can provide a leakage flow in the bypass branch 5 between 1/50 to about 1/5 maximum flow from the branch 5.
  • the control means 19 at least temporarily control the total opening O of the bypass actuator 15 (FIG. 6).
  • the degree of opening of the actuator 15 may be at least temporarily proportional to the temperature T of the cooling fluid. More specifically, between T 1 and T 2 , the opening of the bypass actuator 15 increases when the temperature T of the fluid increases and decreases when the temperature T of the fluid decreases. The variation of the opening of the actuator 15 may be proportional to the temperature of the fluid T.
  • the curve representative of the opening of the actuator 15 as a function of the temperature T of the fluid can exhibit a hysteresis H. That is to say that the increase in the opening of the actuator 15 begins. after the temperature of the liquid T exceeds the first reference temperature T 1 of a first determined value E. Likewise, the decrease in the opening of the actuator 15 begins after the temperature T of the liquid becomes lower, from a first determined value E, to the second reference temperature T 2 . That is to say that the openings and closures of the actuator 15 are made offset with respect to the temperature thresholds T 1 and T 2, respectively .
  • the values E of these offsets are, for example, of the order of 5 degrees.
  • control means 19 can control the actuator 15 of the branch 5 by-pass as a function of the opening and closing of the actuator 14 of the branch 4 radiator.
  • FIG. 7 illustrates the percentage of opening% O of the actuators 15, 14 of the branches 5 of bypass and radiator 4 as a function of the temperature T of the coolant.
  • the control means 19 can close the actuator 15 of the bypass branch 5 when the actuator 14 of the radiator branch 4 is Similarly, the actuator 15 of the branch 5 bypass is open O when the actuator 14 of the radiator branch 4 is closed F.
  • the opening of the actuator 15 of the branch 5 by -pass is inversely proportional to the opening of the actuator 14 of the branch 4 radiator.
  • closures and openings of the actuator 15 of the bypass branch 5 can be made with a temperature offset R determined with respect to the openings and closures of the actuator 14 of the radiator branch 4.
  • the temperature offset R may be of the order of a few degrees, for example five degrees.
  • control means 19 can control the ventilation means 30 as a function of the temperature of the coolant. More precisely, the speed of rotation of the ventilation means 30 can increase when the temperature T of the coolant increases.
  • the speed V of rotation of the ventilation means 30 increases in proportion to the speed of variation of the temperature of the coolant. d T d t .
  • FIG. 8 illustrates two examples of lines d1 and d2 representing the speed of rotation of the fan motor unit as a function of the temperature T of the liquid.
  • the two straight lines d1 and d2 have different slopes each representative of a speed of variation d T d t the temperature T of the coolant.
  • the speed of variation d T d t the temperature T of the coolant can be calculated by the control means 19.
  • the ventilation means 30 are started when the temperature T of the cooling fluid is greater than the set temperature Tc and the flow rate of the cooling liquid in the radiator branch 4 is substantially maximum.
  • control means 19 can cooperate with the information acquisition means 22 for determining the temperature of the air located under the hood of the vehicle, so as to start the ventilation means 30 when the temperature of the the air under the hood is above a certain threshold.
  • the information acquisition means 22 may be shaped to detect a possible failure of at least one of the electronically controlled actuators.
  • the control means 19 can ensure the free circulation of the fluid in at least some of the branches, and preferably in all branches. That is, when a system failure is detected, all valves in circuit 2 are open.
  • the cooling device according to the invention while being of simple structure, makes it possible to manage the heat exchanges in real time and in an optimum manner.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Air-Conditioning For Vehicles (AREA)
EP01907697A 2000-03-17 2001-01-25 Procede et dispositif de refroidissement d'un moteur de vehicule automobile Expired - Lifetime EP1264086B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0003436 2000-03-17
FR0003436A FR2806444B1 (fr) 2000-03-17 2000-03-17 Dispositif de refroidissement d'un moteur de vehicule automobile
PCT/FR2001/000238 WO2001069056A1 (fr) 2000-03-17 2001-01-25 Procede et dispositif de refroidissement d'un moteur de vehicule automobile

Publications (2)

Publication Number Publication Date
EP1264086A1 EP1264086A1 (fr) 2002-12-11
EP1264086B1 true EP1264086B1 (fr) 2006-10-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01907697A Expired - Lifetime EP1264086B1 (fr) 2000-03-17 2001-01-25 Procede et dispositif de refroidissement d'un moteur de vehicule automobile

Country Status (7)

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FR2806444A1 (fr) 2001-09-21
DE60123587T2 (de) 2007-08-09
US6880495B2 (en) 2005-04-19
FR2806444B1 (fr) 2002-06-07
WO2001069056A1 (fr) 2001-09-20
ES2273806T3 (es) 2007-05-16
DE60123587D1 (de) 2006-11-16
US20030196612A1 (en) 2003-10-23
JP4606683B2 (ja) 2011-01-05
EP1264086A1 (fr) 2002-12-11
JP2003528241A (ja) 2003-09-24

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