EP1264086A1 - Procede et dispositif de refroidissement d'un moteur de vehicule automobile - Google Patents
Procede et dispositif de refroidissement d'un moteur de vehicule automobileInfo
- Publication number
- EP1264086A1 EP1264086A1 EP01907697A EP01907697A EP1264086A1 EP 1264086 A1 EP1264086 A1 EP 1264086A1 EP 01907697 A EP01907697 A EP 01907697A EP 01907697 A EP01907697 A EP 01907697A EP 1264086 A1 EP1264086 A1 EP 1264086A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- coolant
- branch
- engine
- radiator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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 device for cooling an automobile vehicle engine.
- the invention relates more particularly to a cooling device comprising a hydraulic circuit of coolant coolant, associated with a circulation pump thereof through the vehicle engine and different branches of the circuit. Vehicle thermal equipment can be placed in the different branches of the circuit.
- the cooling systems are designed to guarantee that the engines withstand the thermomechanical stresses resulting from combustion.
- additional functions are implemented in addition to the main engine cooling, to improve overall performance or to offer and guarantee benefits to vehicle users, such as, for example, passenger compartment heating .
- the cooling systems are dimensioned from the only operating points at maximum speed and at full load of the engine and are therefore oversized in the majority of vehicle use cases.
- the engine operating parameters are not optimized, which results in a degradation of the performance of the latter, such as increased consumption, a high level of pollutant emission as well as a reduction in the thermal and acoustic comfort of the engine. vehicle.
- Document EP55711 3 describes a system for cooling an engine comprising, a loop of heat-transfer liquid connected to a radiator, and means for regulating the flow rate of the liquid in this loop.
- the flow regulation means are controlled by the operating conditions of the vehicle, in particular by means of sensors. of the temperature of the liquid located in different places of the loop.
- the flow of the heat transfer liquid 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 quantities, without however optimizing the heat exchanges with the heat transfer liquid.
- An object of the present invention is to provide a method of cooling a motor vehicle engine, pal l iant all or part of the drawbacks of the prior art noted above.
- the method of cooling an automobile vehicle engine consists in regulating the volume and the flow rate of a coolant coolant in a hydraulic circuit provided with a branch provided with an actuator. electronically controlled and provided with means forming a radiator, the method comprising a first step of determining the temperature of the coolant, a step of comparing this temperature with a threshold temperature determined from which the engine is said to be "hot” , and, when the temperature of the fluid is higher than the threshold temperature, the flow rate in the radiator branch is regulated so as to maintain the temperature of the cooling liquid around a predetermined set value, characterized in that the representative curve of the opening of the thermostatic valve depending on the temperature of the coolant has a hyster ésis around the set temperature, so as to regulate the temperature of the coolant to said set temperature.
- the cooling device of a motor vehicle engine is of the type comprising a hydraulic circuit of heat transfer fluid, associated with a circulation pump thereof through the vehicle engine and different branches of the circuit, in which the thermal equipment of the vehicle are 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 means for acquiring information relating to the operating conditions of the vehicle, connected to means for controlling the operation of the actuators, for regulating the volume and the flow rate of fluid in circulation in the hydraulic circuit in order to optimize the operation of the engine, the circuit comprising a branch provided an electronically controlled actuator provided with means forming a radiator, the acquisition means n of information being able to determine the temperature of the cooling fluid, so that, when the temperature of the fluid is greater than a temperature only determined from which the engine is said to be "hot", the control means
- the invention may include one or more of the following characteristics:
- the set temperature is between 60 and 120 degrees approximately
- the batching means cooperate with the information acquisition means, to determine the temperature of the engine intake air, so as to increase the flow rate in said branch when the temperature of the engine intake air increases above a first determined threshold,
- control means increase the flow in the radiator branch when the temperature of the intake air of the engine increases, so as to ensure a maximum flow in the branch when the temperature of the intake air of the engine reaches a second determined threshold
- the footing means cooperate with the information acquisition means, to determine the speed of the vehicle, so as to increase the speed in said branch when the speed of the vehicle increases beyond a first determined threshold,
- control means increase the flow in the radiator branch when the vehicle speed increases, so as to ensure a maximum flow in the branch when the vehicle speed reaches a second determined threshold
- the device comprises ventilation means, or "Moto Fan Group", capable of cooperating with the means forming a radiator, the control means ensuring the control of the ventilation means as a function of the temperature of the coolant, so that the speed of rotation of the ventilation means increases when the temperature of the cooling fluid increases,
- the increase in the speed of rotation of the ventilation means is controlled as a function of the speed of variation of the temperature of the cooling liquid
- the speed of rotation of the ventilation means as a function of the temperature of the coolant describes a straight line whose slope is proportional to the speed of variation of the temperature of the coolant
- the ventilation means are switched on when the temperature of the cooling fluid is higher than the set temperature and the flow rate of the liquid cooling in the radiator branch is substantially maximum
- the loting means cooperate with the information acquisition means to determine the temperature of the air located under the hood of the vehicle so as to turn on the ventilation means when the temperature of the air located under the hood is greater than a determined threshold
- FIG. 1 schematically represents the structure and the operation of an exemplary embodiment of the cooling device according to the invention
- FIG. 2 represents, on the same graph, an example of variation over time t of the temperature T of the cooling liquid and of a first threshold temperature Ti,
- FIG. 3 represents the variation of a set temperature Te as a function of the torque C of the vehicle engine, at constant engine speed,
- FIG. 4 represents the variation in the percentage of opening of the radiator valve as a function of the temperature T of the cooling fluid
- FIG. 5 represents an example of variation of the electric pulse I for controlling the radiator valve as a function of the temperature of the intake air Ta of the engine, at constant torque, constant speed and vehicle speed,
- FIG. 6 represents the state of opening of a bypass valve as a function of the temperature T of the cooling liquid
- FIG. 7 schematically represents an example of coupling of the opening of the bypass valve as a function of the opening of the radiator valve
- FIG. 8 shows two examples of variation of the speed of rotation of a fan motor unit, depending on the variation of the temperature T of the coolant.
- FIG. 1 shows an example of a preferred embodiment of a cooling device according to the invention.
- the cooling device comprises a hydraulic circuit 2 containing a coolant coolant.
- a hydraulic pump 3 is associated with circuit 2, to ensure the circulation of the fluid through the motor 1 and different branches 4, 5, 6, 7, 8, 44 of circuit 2.
- pump 3 is a type pump mechanical, however, the use of an electric pump can also be considered.
- the branches 4, 5, 6, 7, 8, 44 of 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 having circulated in the branches is recovered by a water inlet reader neck 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 actuated pi actuators 14, 15, 16, 17, 18, 29 for regulating the circulation of the fluid therein. the latter.
- the electronically batched pi actuators can be, for example, electrically controlled solenoid valves or 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 acquisition means 22 are connected to means 1 9 for setting the operation of at least part of the actuators 14, 1 5, 16, 17, 1 8, 29, for regulating the volume and the flow rate of fluid in circulation in the hydraulic circuit 2 so optimize engine operation.
- the control means 19 or information processing unit can comprise any suitable computer 20, such as, for example, a "Smart Servitude Box” (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 capable of determining at least one of the following parameters: the engine speed, the engine torque, the vehicle speed, the temperature of the engine lubricating oil , the temperature of the engine coolant, the temperature of the engine exhaust gas, the temperature of the air outside 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, 1 5, 16, 1 7, 1 8, 29 and possibly that of the pump 3.
- the flow rate or volume of the cooling liquid admitted or not to circulate in the different branches 4, 5, 6, 7, 8, 44 of the circuit 2 is a function of the temperature rise state of the engine 1.
- the thermal state of the engine 1 is characterized as a function of the temperature T of the cooling liquid, preferably at the outlet of the engine 1.
- the state of the engine 1 is said to be cold.
- the first Ti and / or the second T 2 threshold temperature can be fixed or variable values determined as a function of the type of motor 1.
- the first Ti and / or the second T 2 threshold temperature are variables as a function of the type of the motor 1 and of at least one operating parameter of the motor 1.
- the first Ti and / or second T 2 threshold temperatures are functions of the average power Pm supplied by the motor 1. That is to say that the control means 1 9 cooperate with the acquisition means 22, to calculate the instantaneous average power Pm supplied by the motor 1.
- the control means 19 then calculate the first T-, and / or the second T 2 threshold temperature, as a function of the instantaneous average power Pm and of a determined modeling of the operation of the engine 1.
- the modeling of the engine defines the cold, hot and intermediate states (first T ⁇ t second T 2 threshold temperatures) as a function of the average power Pm supplied by the latter.
- the values of the speed N and of the torque C can be measured by the data acquisition means 22, that is to say tell by appropriate sensors.
- the engine speed N is between 0 and 6000 rpm. approx., while the torque C is between 0 and 350 N. m. about.
- the batching means 1 9 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.
- the average power Pm (t) at time t can be calculated by the following relationship:
- Pm (t) -, in which Pm (t-1) is the average power at the instant (t-1).
- the computer 1 9 and / or the means 21 for storing information 21 may contain the modeling of the operation of the engine 1, defining its cold, hot and intermediate state (first Ti and second temperatures only l T 2 ) as a function of average power Pm. That is to say that for a given type of engine, it is established empirically and / or by calculation of the correspondence tables giving the threshold temperatures Ti and T 2 as a function of the average power Pm of the engine 1. These tables or modelizations, which are function of the type of engine, are for example polynomial functions.
- the first threshold temperature Ti is thus, in general, a decreasing function of the average power.
- the first temperature only can vary between about 20 and 60 degrees, and preferably between 30 and 50 degrees.
- the second threshold temperature T 2 can vary as for between 60 and 100 degrees. 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 cooling liquid with the only two temperatures Ti and T 2 .
- the value of the first threshold temperature Ti can be frozen by the control means 1 9 as soon as the measured temperature T of the cooling liquid reaches the first threshold temperature T L
- FIG. 2 illustrates , on the same graph, an example of variation over time t: of the temperature T of the cooling liquid, and of the first temperature only T ⁇ (Pm) which is a function of the average power.
- the circuit comprises a branch 4 provided with an pi-actuated electronically 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 higher than the second threshold temperature T 2 , the control means 19 regulate the flow in branch 4 of the radiator so as to maintain the temperature T of the coolant around a given setpoint Te.
- the set temperature Te is the temperature of the coolant ensuring optimal operation of the engine 1.
- This setpoint temperature Te is defined, for example, by modeling the motor concerned.
- the set temperature Te is for example between 60 and 120 degrees, and preferably between 80 and 100 degrees approximately.
- the means 1 9 for batching cooperate with the means 22 for acquiring information to determine the set temperature Te as a function of the speed N and / or of the torque C of the motor 1.
- the set temperature Te decreases when the torque C of the motor 1 increases.
- the set temperature Te decreases when the speed N of engine 1 increases.
- FIG. 3 illustrates an example of a curve representative of the variation of the set temperature Te as a function of the torque C of the engine, at constant speed N.
- the curve representative of the variation of the set temperature Te as a function of the torque C at constant speed N can have a general appearance comparable to that of the curve of FIG. 3.
- the actuator 14 of the radiator branch 4 may consist of a thermostatic valve able to be controlled electronically.
- the valve 14 can contain an element capable of expanding or shrinking, to regulate the degree of opening of the valve as a function of its temperature.
- the element capable of expanding can 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 opening percentage% O of the thermostatic valve 14 of radiator as a function of the temperature T of the coolant.
- FIG. 4 illustrates two examples of regulating the temperature T of the coolant around respectively two set set temperatures Tel, Tc2.
- the opening curve O of the thermostatic valve 14 has a first hysteresis h1 around the first set temperature Tel and a second hysteresis h2 around the second set temperature Tc2.
- the sequence of closing phases F 1, progressive opening F2, opening F3, and progressive closing F4 of the valve 14 is symbolized by arrows.
- the first setpoint temperature Tel may correspond, for example, to a phase of high demand on the motor, while the second setpoint temperature Tc2, which is higher, may correspond to a lower request on the motor.
- the actuator 14 of the branch 4 of the radiator can consist of a proportional valve controlled electronically.
- the control means 19 can increase the opening of the valve 14 proportional.
- the control means 1 9 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 increase the flow rate of the cooling fluid in the branch 4 of the radiator when the air temperature Ta engine 1 intake increases beyond a first determined threshold S 1.
- control means 19 can ensure maximum flow in the radiator branch 4 when the temperature Ta of the intake air of the engine 1 reaches a second determined 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 electric pulse or current I for controlling the valve
- 11 designates the electrical pulse delivered to the actuator 14 (proportional solenoid valve or thermovalve) for a given setpoint temperature Tel.
- This electrical pulse 11 which is between 0 and 100% of the maximum pulse, defines a partial opening of the determined actuator 14.
- the electrical pulse I delivered to the actuator 14 tends towards 11.
- the lottery means 19 can cooperate with the information acquisition means 22 to determine the speed of the vehicle, so as to increase the flow in lad ite branch 4 when the vehicle speed increases beyond a first determined threshold.
- the footing means 19 can ensure maximum flow in the branch 4 of the radiator when the vehicle speed reaches a second determined threshold.
- the curve of variation of the electric pulse or intensity I 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 can be of the order of half the maximum authorized speed and the maximum speed respectively.
- the circuit 2 comprises another branch 5 provided with an electronically controlled actuator 1 5 and associated with means 10 forming direct return of fluid or bypass.
- the means 1 9 for batching can regulate the circulation of the cooling fluid in the branch 5 of bypass as a function of the temperature T of this fluid.
- the quantity of fluid admitted to circulate in the branch 5 by-pass increases when the temperature of the fluid increases from the first Ti towards the second threshold temperature T 2 .
- the electronically lot pi actuator 15 of the bypass branch 5 is of the proportional type.
- the control means 19 can limit the circulation of fluid in the branch 5 bypass to a determined leakage rate.
- the actuator 1 5 of the branch 5 by-pass is partially open Of.
- the partial opening Of of the actuator 1 5 can ensure a leakage rate in the branch 5 by- pass between 1/50 th to about 1/5 th of the maximum flow of branch 5.
- the control means 19 at least temporarily control the total opening O of the bypass actuator 1 5 ( Figure 6). Furthermore, when the temperature of the fluid is between the first Ti and second threshold temperatures T 2 , the degree of opening of the actuator 15 can be at least temporarily proportional to the temperature T of the cooling fluid. More precisely, between 1 ⁇ and T 2 , the opening of the bypass actuator 1 5 increases when the temperature T of the fluid increases and decreases when the temperature T of the fluid decreases. The variation in the opening of the actuator 15 can 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 have a hysteresis H. That is to say, the increase in the opening of the actuator 1 5 begins after the temperature of the liquid T exceeds the first reference temperature Ti by a first determined value E. Likewise, the reduction in the opening of the actuator 15 begins after the temperature T of the liquid becomes lower, by a first determined value E, than the second reference temperature T 2 . That is to say that the openings and closings of the actuator 1 5 are produced in a manner offset relative to the temperature thresholds Ti and T 2 respectively .
- the E values of these offsets are, for example, of the order of 5 degrees.
- control means 19 can control the actuator 15 of the branch
- FIG 7 it shows the percentage of opening% O of the actuators 1 5, 14 of the branches 5 of bypass and radiator
- control means 1 9 can close F the actuator 15 of the branch
- the actuator 14 of branch 4 radiator when the actuator 14 of branch 4 radiator is open O.
- the actuator 15 of the branch 5 bypass is open O when the actuator 14 of the branch 4 radiator is closed F.
- the opening of the actuator 1 5 of the branch 5 bypass is inversely proportional to the opening of the actuator 14 of the branch 4 radiator.
- the closings and openings of the actuator 1 5 of the branch 5 bypass can be produced with a temperature offset R determined with respect to the openings and closings of the actuator 14 of the branch 4 radiator.
- the temperature shift R can be of the order of a few degrees, for example five degrees.
- the piotage means 1 9 can control the ventilation means 30 depending on the temperature of the coolant. More specifically, the speed of rotation of the ventilation means 30 can increase when the temperature T of the cooling liquid increases.
- the speed V of rotation of the ventilation means 30 increases in proportion to the speed of
- FIG. 8 illustrates two examples of lines d 1 and d 2 representing the speed of rotation of the motor fan unit as a function of the temperature T of the liquid.
- the two lines d1 and d2 have different slopes, each representative of a speed of variation - of the temperature T of the coolant.
- the speed of variation - of temperature dt is the speed of variation - of temperature dt
- T coolant can be calculated by means 1 9 of loting.
- the ventilation means 30 are switched on when the temperature T of the cooling fluid is higher than the set temperature Te and the flow rate of the cooling liquid in the branch 4 radiator is substantially maximum.
- the means 1 9 of loting can cooperate with the means 22 for acquiring information to determine the temperature of the air located under the hood of the vehicle, so as to start the ventilation means 30 when the air temperature under the hood is above a certain threshold.
- the means 22 for acquiring information can be configured to detect a possible defect in at least one of the electronically controlled actuators.
- the control means 1 9 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 of the valves in circuit 2 are open.
- the cooling device according to the invention while being of simple structure, makes it possible to manage heat exchanges in real time and in an optimum manner.
Landscapes
- 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)
Abstract
Description
Claims
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 true EP1264086A1 (fr) | 2002-12-11 |
EP1264086B1 EP1264086B1 (fr) | 2006-10-04 |
Family
ID=8848203
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)
Country | Link |
---|---|
US (1) | US6880495B2 (fr) |
EP (1) | EP1264086B1 (fr) |
JP (1) | JP4606683B2 (fr) |
DE (1) | DE60123587T2 (fr) |
ES (1) | ES2273806T3 (fr) |
FR (1) | FR2806444B1 (fr) |
WO (1) | WO2001069056A1 (fr) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6867395B2 (en) * | 2002-10-22 | 2005-03-15 | General Motors Corporation | Variable flow thermostat and method for variably controlling engine temperature |
JP2004353602A (ja) * | 2003-05-30 | 2004-12-16 | Nippon Thermostat Co Ltd | 電子制御サーモスタットの制御方法 |
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2000
- 2000-03-17 FR FR0003436A patent/FR2806444B1/fr not_active Expired - Fee Related
-
2001
- 2001-01-25 US US10/221,153 patent/US6880495B2/en not_active Expired - Fee Related
- 2001-01-25 JP JP2001567912A patent/JP4606683B2/ja not_active Expired - Fee Related
- 2001-01-25 EP EP01907697A patent/EP1264086B1/fr not_active Expired - Lifetime
- 2001-01-25 WO PCT/FR2001/000238 patent/WO2001069056A1/fr active IP Right Grant
- 2001-01-25 DE DE60123587T patent/DE60123587T2/de not_active Expired - Lifetime
- 2001-01-25 ES ES01907697T patent/ES2273806T3/es not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
---|---|
FR2806444A1 (fr) | 2001-09-21 |
EP1264086B1 (fr) | 2006-10-04 |
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 |
JP2003528241A (ja) | 2003-09-24 |
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