• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    1 4Abstract The present invention relates to a Cooling system for an electric power unit in a vehicle (1).The cooling system comprises a high temperature cooling circuit (6) with a circulating coolantcooling power electronics (5), a first radiator (8) arranged in the high temperature coolingcircuit (6), a low temperature cooling circuit (15) with a circulating coolant cooling an electricenergy storage (4) and a second radiator (17) arranged in the low temperature cooling circuit(15). The cooling system comprises first flow means (18, 19) able to direct coolant in the lowtemperature cooling circuit (15) past the second radiator (17) and second flow means (36-39)able to direct coolant in the high temperature cooling circuit to the first radiator (8) where it iscooled in a first step and then to the second radiator (17) where it is cooled in a second step before it is used to cool the power electronics (5). (Pig. i)
    公开号:SE1650808A1
    申请号:SE1650808
    申请日:2016-06-09
    公开日:2017-12-10
    发明作者:Mustonen Markus
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    A cooling system for an electric power unit in a vehicle BACKGROUND OF THE INVENTION AND PRIOR ART The present invention relates to a Cooling system for an electric power unit in a vehicle according to the preamble of claim 1.
    Hybrid vehicles may be powered by an electric power unit in combination with some otherform of power unit such as a combustion engine. The electric power unit may comprise anelectric machine which altemately works as motor and generator, an electric energy storagefor storing of electrical energy and power electronics for controlling the flow of electricalenergy between the electrical energy storage and the electric machine. The power electronicsmay include a DC converter and an inverter for conducting electrical energy between theelectrical energy storage and the electric machine. The electrical energy storage and the powerelectronics are heated during operation. The electrical energy storage and power electronicsare designed to operate within a specific temperature range. The electrical energy storage mayhave an optimal efficient operating temperature within the temperature range of 20-25°C. Thepower electronics can usually withstand a temperature up to about 60-70 °C. Consequently, itis suitable to cool the electrical energy storage and the power electronics with coolant ofdifferent temperatures. Furthermore, the efficiency of the electrical energy storage is reducedthan it has a too low temperature. Consequently, it is also suitable to heat the electrical energy storage during operating conditions when it has a too low temperature.
    DE 10 2014 115 377 Al shows a cooling system for a motor vehicle comprising at least a firstradiator and a second radiator mounted in a front region of the motor vehicle. The coolingsystem comprises a first circuit which cools electric batteries and a second circuit which coolspower electronic components. The cooling system comprises valves which are able toselectively connect the first circuit to the first radiator and the second circuit to the secondradiator. Furthermore, the valves are able to separate the first circuit from the first radiator andconnect the second circuit to the first radiator and the second radiator which radiators arearranged in parallel. Alternatively, the valves are able to separate the second circuit from the second radiator and connect the first circuit to the parallel arranged radiators.
    SUMMARY OF THE INVENTION The object of the present invention is to provide a cooling system for cooling of an electricenergy storage and power electronics which is able to prevent heating of the power electronicsto a too high temperature during operating conditions when the surrounding air temperature and the cooling demand are very high.
    The above mentioned object is achieved by the cooling system according to the characterizedpart of claim l. The power electronics are cooled by coolant in a high temperature coolingcircuit and the electric energy storage is cooled by coolant in a low temperature coolingcircuit. The use of two cooling circuits with different coolant temperatures makes it possibleto provide an individual cooling of the electric energy storage and the power electronics.During occasions when the surround air temperature is higher or close to an optimal efficientoperating temperature of the electrical energy storage, it is not possible to cool the coolant inthe second radiator by surrounding air to a temperature low enough to cool the electricalenergy storage. ln this case, the electric energy storage is to be cooled by the refrigerationsystem. During such operating conditions, the first flow means directs the coolant in the lowtemperature cooling circuit, via the bypass line, past the second radiator. Since the lowtemperature cooling circuit does not use the second radiator, it can be used by the hightemperature cooling circuit. As a consequence, the second flow means directs coolant fromthe high temperature cooling circuit, which has been cooled in a first step in the first radiator,to the second radiator. When the coolant has been cooled in a second step in the secondradiator, the coolant is directed back to the high temperature cooling circuit. Since the coolantis directed in series through the first radiator and the second radiator, it is possible to cool thecoolant to a low temperature. lt is substantially always possible to cool the coolant in thesecond step in the second radiator to a temperature low enough to cool the power electronicsto an efficient operating temperature. Consequently, no additional radiator has to be used forcooling the coolant in the high temperature cooling circuit during operating conditions when the surrounding air temperature and the cooling demand are very high.
    According to an embodiment of the invention, the second flow means comprises a firstconnection line having an extension between a first end connected to the high temperaturecooling circuit in a position downstream of the first radiator and a second end connected tothe low temperature cooling circuit in a position upstream of the second radiator, a first valvedevice configured to control the coolant flow through the first connection line, a secondconnection line having an extension between a first end connected to the low temperaturecooling circuit in a position downstream of the second radiator and a second end connected to the high temperature cooling circuit in a position downstream of the first end of the first 3 connection line, and a second Valve device configured to control the coolant flow through thesecond connection line. The first connection line and the first valve device make it easy todirect coolant, which has been cooled in a first step in the first radiator, to the second radiatorin the low temperature cooling circuit. The second connection line and the second valvedevice make it easy to direct the coolant back to the high temperature cooling circuit as soon as the coolant has been cooled in the second radiator.
    According to an embodiment of the invention, the first valve device is a first three way valvearranged in the first end or the second end of the first connection line. Thus, the first threeway valve may be arranged in a connection point between the first connection line and thehigh temperature cooling circuit or in a connection point between the first connection line andthe low temperature cooling circuit. Alternatively, the first valve device may comprise a twoway valve arranged in the first connection line in a position between its ends and acomplimentary two way valve arranged in a suitable position of the high temperature cooling circuit or the low temperature cooling circuit.
    According to an embodiment of the invention, the second valve device is a second three wayvalve arranged in the first end or the second end of the second connection line. Thus, thesecond three way valve may be arranged in a connection point between the second connectionline and the high temperature cooling circuit or in a connection point between the secondconnection line and the low temperature cooling circuit. Alternatively, the second valvedevice comprises a two way valve arranged in the second connection line in a positionbetween its ends and a complimentary two way valve arranged in a suitable position of the high temperature cooling circuit or the low temperature cooling circuit.
    According to an embodiment of the invention, the first flow means comprises a bypass linehaving an extension between an first end connected to the low temperature cooling circuit in aposition upstream of the second radiator and an second end connected to the low temperaturecooling circuit in a position downstream of the second radiator, and a bypass valve deviceconfigured to control the coolant flow through the bypass line. The bypass line and the bypassvalve device make it easy to alternatively direct the coolant in the low temperature coolingcircuit to the second radiator or past the second radiator. The bypass valve device may be athree way valve arranged in the first end or the second end of the bypass line. Alternatively,the bypass valve device comprises a two way valve arranged in the bypass line in a positionbetween said ends and a two way valve arranged in a suitable position in the low temperature cooling circuit. 4 According to an embodiment of the invention, the first end of the bypass line is arranged in aposition upstream of the second end of the first connection line in the low temperature coolingcircuit. Such a design is necessary in order to avoid miXing of the coolants in the lowtemperature cooling circuit with the coolant in the high temperature cooling circuit. Thesecond end of the bypass line is arranged in a position downstream of the first end of thesecond connection line in the low temperature cooling circuit. Such a design is also necessary in order to avoid miXing of the coolants in the respective cooling circuits.
    According to an embodiment of the invention, the cooling system comprises a control unitconfigured to receive information about the temperature of the electrical energy storage andthe temperature of the power electronics, and to control the cooling system by means of theseinformation. ln this case, the control unit may receive information about the temperature ofthe coolant when it has cooled the electrical energy storage in the low temperature coolingcircuit and the temperature of the coolant when it has cooled the power electronics in the hightemperature cooling circuit. lf the temperature of the electrical energy storage and/or thepower electronics are not within an efficient operating temperature range, the control unitprovides measures adjusting the cooling power in the high temperature cooling circuit and/or the low temperature cooling circuit.
    According to an embodiment of the invention, the cooling system is configured to receiveinformation about surrounding air temperature and to control the valve devices such thatcoolant from the high temperature cooling circuit is cooled in a first step in the first radiatorand in a second step in the second radiator when the surrounding air temperature eXceeds apredeterrnined temperature. ln case surrounding air temperature is higher or close to anefficient operating temperature of the electrical energy storage, it is not possible to use thesecond radiator for cooling the coolant in the low temperature cooling circuit to a temperaturelow enough to cool the electrical energy storage. In this case, the control unit directs thecoolant in the low temperature cooling circuit to the bypass line by means of the bypass valve.lf the temperature of the power electronics is high at the same time, the control unit controlsthe valve devices such that the coolant in the high temperature cooling circuit is cooled in afirst step in the first radiator and in a second step in the second radiator before it is directed tothe power electronics. This measure results in that the coolant will be cooled to a temperature low enough to cool the power electronics to an efficient operating temperature.
    According to an embodiment of the invention, the cooling system comprises a first radiatorfan configured to provide a first air flow through a first part of the first radiator and thesecond radiator, and a second radiator fan configured to provide a second air flow through a second part of the first radiator and a condenser in the refrigeration system. ln some cases, it is favorable to provide air flows of different sizes through the radiators. Said first part of thefirst radiator is arranged in a position downstream of the second radiator with respect to theintended flow direction of the first air flow. In this case, the coolant in the low temperaturecooling circuit is cooled to a lower temperature than the coolant in the high temperaturecooling circuit. Such a temperature difference between the coolants in the respective coolingcircuits is necessary in order to provide a cooling of the electric energy storage to a lower temperature than the power electronics.
    According to an embodiment of the invention, said second part of the first radiator is arrangedin a position downstream of the condenser in the refrigeration system with respect to thedirection of the second air flow. Such an arrangement of the condenser and the first radiator isadvantageous since the refrigerant usually needs to be cooled to a lower temperature than the coolant in the high temperature cooling circuit.
    According to an embodiment of the invention, each radiator fan may be driven by an electricmotor. The speed of an electric motor is easily adjustable and thus the speed of the radiatorfans and the cooling air flow rates through the radiators and the condenser. The speed of theradiator fans may be controlled by a control unit. The control unit may receive informationabout the temperature of the electric energy storage and power electronics and to control theradiator fans in order to continuously maintain an efficient operating temperature of the electric energy storage and power electronics.
    BRIEF DESCRIPTION OF THE DRAWING In the following a preferred embodiment of the invention is described, as an example, andwith reference to the attached drawing, in which: Fig. l shows a cooling system according to an embodiment of the invention.
    DETAILED DESCRIPTION OF A PREFERRED EMB ODIMENT OF THE INVENTION Fig. l shows a cooling system for a schematically indicated hybrid vehicle l. The hybridvehicle l is a powered by an electric machine 2 and a combustion engine 3. The electricmachine works alternately as motor and generator. The hybrid vehicle l comprises an electricenergy storage 4 for storing of electrical energy and power electronics 5 for controlling theflow of electrical energy between the electrical energy storage 4 and the electric machine 2.The electrical energy storage 4 and the power electronics 5 are heated during operation. Thus, the electrical energy storage 4 and the power electronics 5 need to be cooled during operation. 6 The electrical energy storage 4 and the power electronics 5 are design to work within arespective specific temperature range. The electrical energy storage 4 is designed to have alower temperature than the power electronics 5. The electrical energy storage 4 may have anoptimal efficiency temperature within the temperature range of 20-25°C. The powerelectronics 5 can usually withstand a temperature up to about 60-70 °C. During certainoperating conditions such as after a cold start, the temperature of the electrical energy storage4 can be too low. In this case, it is suitable to use the cooling system for heating the electrical energy storage 4.
    The cooling system comprises a high temperature cooling circuit 6 with a circulating coolant.The high temperature cooling circuit 6 is indicated by a double line in fig. l. The hightemperature cooling circuit 6 comprises an expansion tank 7. The high temperature coolingcircuit further comprises a first radiator 8 where the coolant is cooled. The coolant enters thefirst radiator 8 via a first radiator inlet line 8a and leaves the first radiator via a first radiatoroutlet line 8b. The first radiator outlet line 8b directs the coolant to a pump 9 which circulatesthe coolant in the high temperature cooling circuit 6. The pump 9 directs the coolant to a firstheat eXchanger l0. The coolant cools an oil in the first heat eXchanger l0 which is circulatedin circuit ll for cooling of the electric machine 2. The coolant leaving the first heat eXchangerl0 enters the power electronics 5. A temperature sensor l4 measures the temperature of thecoolant leaving the power electronics 5. Finally, the coolant in the high temperature coolingcircuit 6 is retumed to the first radiator 8. Consequently, the coolant in the high temperature cooling circuit is used to cool the power electronics 5.
    The cooling system comprises a low temperature cooling circuit l5 with a circulating coolant.The low temperature cooling circuit l5 comprises an expansion tank l6. The low temperaturecooling circuit l5 further comprises a second radiator l7 where the coolant in the lowtemperature cooling circuit l5 is cooled. The coolant enters the second radiator l7 via asecond radiator inlet line l7a and leaves the second radiator l7 via a second radiator outletline l7b. The second radiator inlet line l7a comprises a bypass valve device l9. The bypassvalve device l9 can direct the coolant to the second radiator l7 or to a bypass line 18directing the coolant past the second radiator l7 and to the second radiator outlet line l7b.The second radiator outlet line l7b directs the coolant to a pump 20 which circulates thecoolant in the low temperature cooling circuit l5. The pump20 directs the coolant to a chiller2l where the coolant in the low temperature cooling circuit l5 is cooled. Thereafter thecoolant enters a second heat eXchanger 22 where the coolant can be heated by coolant fromthe cooling system cooling the combustion engine 3. ln this case, a second heating circuit 23with coolant is used to heat the coolant in the low temperature cooling circuit. The control unit l2 regulates the coolant flow to the second heat eXchanger 22 by means of a valve 24. 7 Alternatively, an electric heater can be used to heat the coolant in the low temperature Coolingcircuit. The coolant leaving the second heat exchanger 22 enters the electrical energy storage4. A temperature sensor 25 measures the temperature of the coolant when it leaves theelectrical energy storage 4. lt is also possible to measures the temperature of the coolantbefore it enters the electrical energy storage 4. Finally, the coolant in the low temperaturecooling circuit 15 is returned to the second radiator l7. Consequently, the coolant in the lowtemperature cooling circuit is used to cool the electrical energy storage 4 but it can also be used to heat the electrical energy storage 4.
    The cooling system comprises a first connection line 38 having an extension between a firstend 381 connected to the high temperature cooling circuit 6 in a position downstream of thefirst radiator 8 and a second end 382 connected to the low temperature cooling circuit l5 in aposition upstream of the second radiator l7. A first valve device in the form of a first threeway valve 36 is configured to control the coolant flow through the first connection line 38.The cooling system further comprises a second connection line 39 having an extensionbetween a first end 391 connected to the low temperature cooling circuit 6 in a positiondownstream of the second radiator l7 and a second end 392 connected to the high temperaturecooling circuit 6 in a position downstream of the first end 381 of the first connection line 38.A second valve device in the form of a second three way valve 37 configured to control thecoolant flow through the second connection line 39. A first end l81 of the bypass line l8 isarranged in a position upstream of the second radiator l7 and the second end 382 of the firstconnection line 38. The second end l82 of the bypass line l8 is arranged in a positiondownstream of the second radiator l7 and the first end 391 of the second connection line 39.The bypass valve device l8 and the three way valves 36, 37 are controlled by the control unitl2.
    The hybrid vehicle l comprises a refrigeration system 26 with a circulating refrigerant. Therefrigeration system 26 comprises a condenser 27 where the refrigerant condenses. Theliquefied refrigerant is directed to an expansion valve 28 where it experiences a pressure dropand a significantly lower temperature. Thereafter, the refrigerant enters an evaporator in theform of the chiller 2l in the low temperature cooling circuit. The refrigerant is heated by thecoolant in the chiller 2l such that it vaporizes. The vaporized refrigerant is directed to acompressor 29. The compressor 29 provides a compression of the refrigerant such that it hasan increased pressure and an increased temperature when it leaves the compressor 29 and enters the condenser 27.
    The cooling system comprises a first radiator fan 30 driven by a first electric motor 3 l. The control unit l2 controls the first electric motor 3l and the speed of the first radiator fan 30. 8 The radiator fan 30 provides a first air flow 32 through a half of the first radiator 8 in the hightemperature cooling circuit and the second radiator 17 in the low temperature cooling circuitl5. The second radiator l7 is arranged in a position upstream of the first radiator 8 withrespect to the flow direction of the first air flow 32. Thus, the coolant in the second radiatorl7 is cooled to a lower temperature than the coolant in the first radiator 8. The cooling systemcomprises a second radiator fan 33 driven by a second electric motor 34. The control unit l2controls the second electric motor 34 and the speed of the second radiator fan 33. The secondradiator fan 33 provides a second air flow 35 through a remaining half of the first radiator 8and the condenser 27 of the refrigeration system. The condenser 27 of the refrigerant system26 is arranged in a position upstream of the first radiator 8 with respect to the flow directionof the second air flow 35. Usually, the refrigerant is cooled to a lower temperature in thecondenser 27 than the coolant in the first radiator 8 but it depends on condenser load, condenser performance and radiator performance.
    During operation of the hybrid vehicle l, the control unit l2 receives information about thetemperature of the coolant from the first temperature sensor l4 and information about thetemperature of the coolant from the second temperature sensor 25. The temperatures of thecoolants are related to the temperatures of the electrical energy storage 4 and the powerelectronics 5. Altematively, temperature sensors may be used which directly measures thetemperatures of the electrical energy storage 4 and the power electronics 5. The control unitl2 controls the speed of the first radiator fan 30 and the second radiator fan 33 and thus thecooling of the coolant in the first radiator 8. The coolant is cooled in the first radiator 8 to atemperature at which it provides a suitable cooling of the power electronics 5. The controlunit l2 controls the speed of the second radiator fan 34 and the cooling of the coolant in thesecond radiator l7. The coolant in the low temperature cooling circuit l5 is cooled in the second radiator l7 and/or in the chiller 2l before it cools the electrical energy storage 4.
    In case the electrical energy storage 4 has a too low temperature, the control unit l2 canreduce the actual speed of the first radiator fan 30 and the cooling of the coolant the secondradiator l7. Altematively, the control unit l2 can reduce the actual speed of the secondradiator fan 33 and reduce the cooling of the refrigerant in the condenser 27. Furthermore, thecontrol unit l2 can set the bypass valve device l9 in a bypass position in which it directs thecoolant flow, via the bypass line l8, past the second radiator l7. The control unit l2 also canshut off the compressor 29 of the compressor refrigeration system 26. As a result, the coolantreceives no cooling in the chiller 2l. Finally, the control unit l2 may open the valve 24 suchthat the coolant cooling the combustion engine 3 heats the coolant in the second heat eXchanger 22 before it enters the electrical energy storage 4. 9 ln case the electrical energy storage 4 has a too high temperature, the control unit 12 canincrease the speed of the first fan 30 such that the coolant is cooled to a lower temperature inthe second radiator 17. Alternately or in combination, the control unit 12 can activate thecompressor 29 and provide a cooling of the coolant in a second step in the chiller 21 before itenters the electrical energy storage 4. ln order to further increase the cooling of the secondcoolant, the control unit 12 can increase the actual speed of the radiator fan 33 such that therefrigerant receives a lower condensation temperature in the condenser 27 resulting in an increased cooling of the coolant in the chiller 21. ln case the power electronics 5 has a too low temperature, the control unit 12 can reduce theactual speed of the radiator fan 30 and/or the actual speed of the second fan 33 such that the coolant leaving the first radiator 8 receives a somewhat higher temperature. ln case the power electronics 5 has a too high temperature, the control unit 12 can increase thespeed of the first fan 30 and/or the speed of the second fan 33 such that the first coolant iscooled to a lower temperature in the radiator 8. However, in case the surrounding air has atemperature of 20°C or higher, it is not possible to use the second radiator 17 for cooling ofthe coolant in the low temperature cooling circuit 15 to a temperature sufficiently low to coolthe electrical energy storage 4 to an efficient operating temperature. ln this case, therefrigeration system 26 has to supply the entire cooling power of the electrical energy storage4. The control unit 12 controls the bypass valve device 19 such that it directs the coolant inthe low temperature cooling circuit, via the bypass line 18, past the second radiator 17.Furthermore, the control unit 12 controls the first three way valve 36 such that it directs thecoolant leaving the first radiator 8, via the first connection line 38, to the second radiator inletline 17a in a position downstream of the bypass valve device 19. Furthermore, the control unit12 controls the second three way valve 37 such that it directs the coolant leaving the secondradiator 17, via the second connection line 39, back to the first radiator outlet line 17a in aposition downstream of the first three way valve 36 in the high temperature cooling circuit 6.ln this case, the coolant in the high temperature cooling circuit is cooled in the first radiator 8in a first step and in the second radiator 17 in a second step. This measure results in a lower temperature of the coolant directing to the power electronics 5.
    Consequently, the control unit 12 has a lot of options to regulate the temperature of thecoolant in the low temperature cooling circuit 15 before it cools the electrical energy storage 4and the coolant in the high temperature cooling circuit 6 before it cools the power electronics5. The control unit 12 has access to information about the most energy efficient option to coolthe electrical energy storage 4 and the power electronics 5 to a temperature within an efficiency operating temperature range. The most energy efficient option can be defined as a minimum supply of electric energy to the radiator fans 30, 31 and to the compressor 29 of the refrigeration system 26.
    The invention is in no Way confined to the embodiment to Which the draWings refer but may be Varied freely Within the scopes of the claims.
    权利要求:
    Claims (15)
    [1] 1. A cooling system for an electric power unit in a vehicle (1), wherein the electric power unitcomprises an electric machine (2), an electric energy storage (4) for storing of electricalenergy and power electronics (5) for controlling the flow of electrical energy between theelectrical energy storage (4) and the electric machine (2), and wherein the cooling systemcomprises a high temperature cooling circuit (6) with a circulating coolant cooling the powerelectronics (5), a first radiator (8) arranged in the high temperature cooling circuit (6), a lowtemperature cooling circuit (15) with a circulating coolant cooling the electric energy storage(4), a second radiator (17) arranged in the low temperature cooling circuit (15) and arefrigeration system (26) configured to cool the coolant in the low temperature cooling circuit(15) in a chiller (21), characterized in that the cooling system comprises first flow means (18,19) able to direct coolant in the low temperature cooling circuit (15) past the second radiator(17) and second flow means (36-39) able to direct coolant in the high temperature coolingcircuit to the first radiator (8) where it is cooled in a first step and then to the second radiator (17) where it is cooled in a second step before it is used to cool the power electronics (5).
    [2] 2. A cooling system according to claim 1, characterized in that the second flow meanscomprises a first connection line (38) having an extension between a first end (381) connectedto the high temperature cooling circuit (6) in a position downstream of the first radiator (8)and a second end (382) connected to the low temperature cooling circuit (15) in a positionupstream of the second radiator (17), a first valve device (36) configured to control thecoolant flow through the first connection line (38), a second connection line (39) having anextension between a first end (391) connected to the low temperature cooling circuit (6) in aposition downstream of the second radiator (17) and a second end (392) connected to the hightemperature cooling circuit (6) in a position downstream of the first end (381) of the firstconnection line (38), and a second valve device (37) configured to control the coolant flow through the second connection line (39).
    [3] 3. A cooling system according to claim 2, characterized in that the first valve device is a threeway valve (36) arranged at the first end (381) or the second end (382) of the first connectionline (38).
    [4] 4. A cooling system according to claim 2 or 3, characterized in that the second valve device isa three way valve (37) arranged at the first end (391) or the second end (392) of the second connection line (39). 12
    [5] 5. A Cooling system according to any one of the preceding c1aims, characterized in that thefirst flow means comprises a bypass 1ine (18) having an extension between a first end (181)connected to the 1ow temperature coo1ing circuit (15) in a position upstream of the secondradiator (17) and a second end (182) connected to the 1ow temperature coo1ing circuit (15) in aposition downstream of the second radiator (17), and a bypass va1ve device (19) configured to contro1 the coo1antf1ow through the bypass 1ine (18).
    [6] 6. A coo1ing system according to c1aim 5, characterized in that the bypass va1ve device is athree way va1ve (19) arranged at the first end (181) or the second end (182) of the bypass 1ine(18).
    [7] 7. A coo1ing system according to c1aim 5 or 6, characterized in that the first end (181) of thebypass 1ine (18) is arranged in a position upstream of the second end (382) of the first connection 1ine (38) in the 1ow temperature coo1ing circuit (15).
    [8] 8. A coo1ing system according to any one of the c1aims 5 to 7, characterized in that the secondend (182) of the bypass 1ine (18) is arranged in a position downstream of the first end (391) of the second connection 1ine (39) in the 1ow temperature coo1ing circuit (15).
    [9] 9. A coo1ing system according to any one of the preceding c1aims, characterized in that thecoo1ing system comprises a contro1 unit (12) configured to receive information about thetemperature of the e1ectrica1 energy storage (4) and the temperature of the power e1ectronics (5), and to contro1 the coo1ing system by means of this information.
    [10] 10. A coo1ing system according to any one of the preceding c1aims, characterized in that thecoo1ing system is configured to receive information about surround air temperature (40), andto contro1 the va1ve devices (36, 37) such that the coo1ant in the high temperature coo1ingcircuit is coo1ed in a first step in the first radiator (8) and in a second step in the second radiator (17) when the surrounding air temperature (40) eXceeds a predetermined temperature.
    [11] 11. A coo1ing system according to any one of the preceding c1aims, characterized in that itcomprises a first radiator fan (30) configured to provide a first air flow (32) through a firstpart of the first radiator (8) and the second radiator (17), and a second radiator fan (33)configured to provide a second air flow (35) through a second part of the first radiator (8) and a condenser (27) of the refrigeration system (26).
    [12] 12. 1312. A coo1ing system according to c1aim 11 characterized in that said first part of the firstradiator (8) is arranged in a position doWnstream of the second radiator (17) With respect to the intended floW direction of the first air floW (32).
    [13] 13. A coo1ing system according to c1aim 9 or 10, characterized in that said second part of thefirst radiator (8) is arranged in a position doWnstream of the condenser (27) of the refrigeration system With respect to the floW direction of the second air floW (35).
    [14] 14. A coo1ing system according to any one of the preceding c1aims, characterized in that each radiator fans (30, 33) is driven by an e1ectric motor (31, 34).
    [15] 15. A coo1ing system according to c1aim 14, characterized in that the speed of the radiator fans (30, 33) are contro11ed by a contro1 unit (12).
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    法律状态:
    优先权:
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    SE1650808A|SE542204C2|2016-06-09|2016-06-09|A cooling system for an electric power unit in a vehicle|SE1650808A| SE542204C2|2016-06-09|2016-06-09|A cooling system for an electric power unit in a vehicle|
    PCT/SE2017/050530| WO2017213573A1|2016-06-09|2017-05-19|A cooling system for an electric power unit in a vehicle|
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    CN201780033682.8A| CN109362232A|2016-06-09|2017-05-19|A kind of cooling system for the electric power unit in vehicle|
    BR112018072907-8A| BR112018072907A2|2016-06-09|2017-05-19|cooling system for an electric motor unit in a vehicle|
    EP17810636.5A| EP3469199B1|2016-06-09|2017-05-19|Cooling system for cooling an electric power unit|
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