• 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:
    18 Abstract The present invention relates to a Cooling system Cooling a combustion engine (2) andat least one further object (14) in a vehicle (l). The cooling system comprises aradiator (ll, ll°), and a main line circuit (4) comprising a first coolant pump (7), afirst valve device (8) receiving coolant from the combustion engine (2) and directing itto a radiator inlet line (Sa, Sa°) and/or to a radiator bypass line (4c), and a second valvedevice (9) receiving coolant from a radiator outlet line (Sa, Sa°) and/or a radiatorbypass line (4c) and directing it to the radiator outlet line (Sa, Sa°) and/or an engineinlet line (4a). The cooling system comprises an auXiliary circuit (6) for cooling of thefurther object (3). The auXiliary circuit (6) comprises a second coolant pump (l2), afirst return line (6b) and a second return line (6c) directing coolant from the auXiliary line circuit (6) to the engine inlet line (4a) or to the radiator inlet line (Sa, Sa°). (Pig. i)
    公开号:SE1650827A1
    申请号:SE1650827
    申请日:2016-06-13
    公开日:2017-12-14
    发明作者:Kardos Zoltan；Hall Ola
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    A cooling system for a combustion engine and a further objectBACKGROUND OF THE INVENTION AND PRIOR ARTThe present invention relates to a Cooling system for a combustion engine and a furtherobject according to the preamble of Claim l.
    A Cooling system in a heavy vehicle is many times used to Cool a combustion engineand at least one further Object demanding a lower Operating temperature than thecombustion engine. The further Object may be the working medium of a WHR systemcooled in a condenser, charge air cooled in a charge air Cooler, an electric machine, anelectric energy storage and power electronics of a hybrid vehicle etc. ln this Case, it isnecessary to Create at least two different Coolant temperature levels in the Coolingsystem. The Coolant of the higher temperature is directed to the combustion engine andthe Coolant of the lower temperature is directed to the further object.
    A drive train of a hybrid vehicle may be driven by an electrical machine and acombustion engine. The electrical machine works as an engine and drives the vehicleduring certain Operating Conditions such as at low speeds and accelerations of thevehicle. During certain Operating conditions, the electrical machine works as agenerator where it supplies electrical energy to a battery. The combustion engine maydrive the vehicle independently Or together with the electrical machine. The electricalmachine is heated during operation. Conventional Cooling of electrical machines maybe performed by air Or water led past an external surface of a housing enclosing theelectrical machine. A more effective Cooling method is to spray Oil On the statorwindings of the electrical machine. The Coolant in a Cooling system Cooling thecombustion engine may also be used to cool the Oil in a heat exchanger before it issprayed into the electrical machine. The Cooling system may also Cool the electricenergy storage and the power electronics of the hybrid vehicle.
    US 2015/0133053 shows a hybrid vehicle Cooling system comprising a closed loopcoolant flowpath including at least one valve directing coolant floW to a combustionengine or a combustion engine bypass, a thermostat directing coolant floW from thecombustion engine or the combustion engine bypass to a radiator or a radiator bypass,hybrid poWertrain components to be cooled, a mechanically coolant pump and anelectrically coolant pump pumping coolant through the closed loop coolant flowpath.
    SUMMARY OF THE INVENTIONThe object of the present invention is to provide a cooling system providing anefficient cooling of a combustion engine and a further component When both are inoperation and When only one of them is in operation.
    The above mentioned object is achieved by the cooling system according to thecharacterized part of claim l. The cooling system comprises a main line circuit forcooling of the combustion engine and an auXiliary line circuit for cooling of the furtherobject. In case the combustion engine and the further object are both in operation, thefirst coolant pump circulates a coolant floW in the main line circuit and the secondcoolant pump circulates a coolant floW in the auXiliary line circuit. The auXiliary linecircuit receives a coolant floW from a radiator outlet line. Thus, coolant at the loWesttemperature in the cooling system is directed to the further object via the auXiliary linecircuit. By means of the first valve device and the second valve device in the main linecircuit it is possible to create a coolant floW to the combustion engine at a highertemperature. The auXiliary circuit comprises a first return line and a second retum linedirecting the coolant from the further object to an engine inlet line in the main linecircuit and to a radiator inlet line. Thus, a part of the coolant leaving the auXiliary linecircuit can be mixed With the coolant in the engine inlet line for cooling of thecombustion engine and a remaining part of the coolant can be directed to the radiatorand thus past the combustion engine.ln case the combustion engine is not in operation, it is usually not necessary to cool thecombustion engine. The first coolant pump is shut off such that the coolant floW in themain line circuit stops. The second coolant pump circulates coolant in the auXiliaryline circuit. During such operating conditions, the auXiliary line circuit receives coolantfrom the radiator and it directs the coolant back to the radiator When it has cooled thefurther object via the second return line. The coolant is circulated in a closed circuitWhich in this case is defined by the auXiliary line circuit and the radiator circuit.ln case the further object not is in operation, it is not necessary to cool the furtherobject. The second coolant pump is shut off such that the coolant floW in the auXiliaryline circuit stops. The first coolant pump provides a coolant floW through the main linecircuit. The first valve device makes it possible to direct the coolant floW leaving thecombustion engine to the radiator or to the radiator bypass line. The second valvedevice directs the coolant from the radiator and/or the radiator bypass line to thecombustion engine. Thus, the coolant is circulated in a closed circuit Which in this caseis defined by the main line circuit and the radiator circuit.
    According to an embodiment of the invention, the second return line comprises a thirdvalve device controlling the coolant floW in the first return line and the second return.Such a third valve device may distribute the coolant floW in the auXiliary circuit tobetween first retum line and the second return line in an adjustable manner. The thirdvalve device may be a three Way valve arranged in a connection point of the secondreturn line and the radiator inlet line. ln this case, the third valve device is designed asa single valve component.
    According to an embodiment of the invention, the first coolant pump is mechanicallydriven. Preferably, the first coolant pump is driven by the combustion engine. ln such acase, the coolant floW through the main line circuit is automatically stopped When thecombustion engine is not in operation. The second coolant pump may be electricallydriven. ln this case, it is easy to control the coolant floW rate circulated in the auXiliarycircuit. Furthermore, it is easy to shut of the second coolant pump such that the coolantflow through the auXiliary line Circuit is stopped When the further object is not inoperation.
    According to an embodiment of the invention, the further object is an electricalmachine. Alternatively or in combination, the coolant flow through the auXiliary linecircuit may cool an electrical energy storage and power electronics controlling thetransfer of electric energy between the electrical machine and the electrical energystorage. The electrical machine may be directly or indirectly cooled by the coolantflow in the auXiliary line circuit. In the latter case, the coolant flow in the auXiliary linecircuit cools an oil in a heat eXchanger whereupon the oil cools the electric machine.According to a further altemative, the further object will be the Working medium in anAC system. During hot days, it is desirable to operate an AC system in a vehicle whenthe combustion engine is not in operation. In this case, the cooling system may coolsthe working medium in a condenser of the AC system.
    According to an embodiment of the invention, a cooling air stream through the radiatoris provided by a mechanically driven radiator fan and an electrically driven auXiliaryradiator fan. In this case, it is possible to increase the cooling of the coolant in theradiator by means of the electrically driven auXiliary radiator fan.
    According to an embodiment of the invention, the radiator is divided in a main radiatorand an auxiliary radiator. The main radiator may be used to cool the coolant flowdirected to the combustion engine. The auXiliary radiator may be used to cool thecoolant flow directed to the further object. The coolant flow directed to the furtherobject may be cooled in a first step in the main radiator and in a second step in theauXiliary radiator. Alternatively, the coolant flow directed to the further object iscooled in one step in the auXiliary radiator. ln this case, the coolant flow through theauXiliary radiator has to be small in order to cool the coolant f to a low temperature.Furthermore, the auxiliary radiator may be arranged in a position in the vehicle whereit is cooled by air of ambient temperature while the main radiator is arranged in aposition where it is cooled by air of a higher temperature. The main radiator may forexample be arranged in a position downstream of another cooler such as a charge aircooler with respect to the direction of the cooling air stream.
    According to an embodiment of the invention, the auXiliary line circuit receivescoolant from a main radiator outlet line and/or an auXiliary radiator outlet line. Thecoolant flow leaving the auXiliary radiator has usually a lower temperature than thecoolant leaving the main radiator. ln this case, it is possible to direct coolant from themain radiator, coolant from the auXiliary radiator or a miXture of coolant from theradiators to the auXiliary line circuit for cooling of the further object. Thus, it ispossible to direct coolant at temperature within a relatively large temperature range tothe further object.
    According to an embodiment of the invention, the cooling system comprises aconnection line arranged between the main radiator outlet line and the auXiliaryradiator outlet line and a valve member controlling the coolant flow through theconnection line. When the valve member is in a closed position, there will be nocoolant flow between the main radiator outlet line and the auXiliary radiator outlet line.The valve member may be set in an open position when the main radiator is able todirect coolant of a sufficient low temperature to the auXiliary line circuit for cooling ofthe further object. Furthermore, the valve member may be set in an open position whenthe main radiator and the auXiliary radiator need to be used for cooling of thecombustion engine when it is highly loaded at the same time as the further object is notin operation.
    According to an embodiment of the invention, the cooling system comprises a controlunit configured to receive information about at least one operating parameter and tocontrol including valves in view of information about said operating parameter. Thecontrol unit may estimate the cooling demand of the combustion engine and the furtherobject by means of the operating parameter and estimate a suitable coolant temperatureand coolant flow rate to direct to the combustion engine and to the further object atwhich they maintain an efficient operating temperature. One of said operatingparameters may be related to the temperature of the combustion engine. ln this case,the control unit may receive information from a temperature sensor sensing thetemperature of the coolant leaving the combustion engine. Alternatively, a temperaturesensor may sense the temperature of a suitable part of the combustion engine. Oneoperating parameter may be related to the temperature of the further object. ln thiscase, the control unit may receive information from a temperature sensor sensing thetemperature of the coolant leaving the further object. Altematively, a temperaturesensor may sense the temperature of a suitable part of the further object. ln order tocontrol the temperature of the coolant, it can be suitable to have a temperature sensorsensing the temperature of the coolant entering the further object and a temperaturesensor sensing the temperature of the coolant leaving the further object. The controlunit may of course receive information from further operating parameters.
    According to an embodiment of the invention, the first valve device is a three Wayvalve. The three Way valve may comprises one inlet opening and two outlet openings.The three Way valve receives, via the inlet opening, a coolant floW from thecombustion engine and directs a first part of it, via a first outlet opening, to the radiatorline and a second part of it, via the second outlet opening, to the radiator bypass line.ln this case, the first valve device is designed as a single valve. Preferably, the firstvalve device is adjustable in a stepless manner. In this case, it is possible to vary thecoolant floW rate to the radiator line and the radiator bypass line With a high accuracy.
    According to an embodiment of the invention, the second valve device is a three Wayvalve. The three Way valve receives a coolant floW from the radiator bypass line anddirects a part of it to the auXiliary circuit and a remaining part of it to the engine inletline. lt may also direct coolant from the main radiator to the engine inlet line. In thiscase, the second valve device is designed as a single valve. Preferably, the secondvalve device is adjustable in a stepless manner. In this case, it is possible to adjust thecoolant floW rate to the auXiliary circuit and the engine inlet line With a high accuracy.
    BRIEF DESCRIPTION OF THE DRAVVINGSIn the following preferred embodiments of the invention is described, as examples,With reference to the attached drawings, in which:Fig. l shows a cooling system according to a first embodiment of the invention,Fig. 2 shows a cooling system according to a second embodiment of theinvention,Fig. 3 shows a front view of a first embodiment of the divided radiator in Fig. 2,Fig. 4 shows a front view of a second embodiment of the divided radiator inFig. 2 andFig. 5 shows a front view of a third embodiment of the divided radiator in Fig.2.
    DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THEINVENTIONFig. l shows a schematically disclosed hybrid vehicle l powered by a combustionengine 2 and an electrical machine 3. The combustion engine 2 may be a diesel engine.The combustion engine 2 and the electrical machine 3 may drive the vehicleindependently or together. During certain operating conditions, the electrical machine3 works as a generator where it supplies electrical energy to an electrical energystorage in the vehicle l. The vehicle l comprises a cooling system with a circulatedcoolant. The cooling system comprises a main line circuit 4 in which the coolant coolsthe combustion engine 2, a radiator line circuit 5 in which the coolant is cooled and anauXiliary line circuit 6 in which the coolant cools the electrical machine 3.
    The main line circuit 4 comprises an engine inlet line 4a directing coolant to thecombustion engine 2. The inlet engine line 4a is provided with a first coolant pump 7circulating the coolant in the main line circuit 4. The first coolant pump 7 ismechanically driven by the combustion engine 2. The first coolant pump 7 circulatesthe coolant through the combustion engine 2. The coolant leaving the combustionengine 2 is received in an engine outlet line 4b. A first valve device in the form of afirst three way valve 8 is arranged at an end of the engine outlet line 4b. The first threeway Valve 8 has an inlet receiving coolant from the engine outlet line 4b, an outletdirecting coolant to a radiator bypass line 4c and an outlet directing coolant to aradiator inlet line 5a in a radiator line circuit 5.
    The main circuit 4 comprises further a second valve device in the form of a secondthree way valve 9. The second three way valve 9 is adjustable in a stepless manner.The second three way valve 9 has an inlet receiving coolant from the radiator bypassline 4c, an outlet directing coolant to the engine inlet line 4a and a third opening whichmay be an inlet or an outlet. The third opening may work as an inlet receiving coolantfrom a radiator outlet line 5b in the radiator circuit 5 and directing it to the engine inletline 3. Altematively, the third opening works as an outlet and directs coolant from theradiator bypass line 4c to the radiator outlet line 5b. The first three way valve 8 and thesecond three way valve 9 are controlled by a control unit 10. The radiator line circuit 5also comprises a radiator 11 for cooling of the coolant in the main line circuit 4 and theauXiliary line circuit 6.
    The auxiliary line circuit 6 comprises a first line 6a receiving coolant from the radiatoroutlet line 5b. The first line including a second coolant pump 12 and a heat eXchanger13. The second coolant pump 12 is electrically driven by a not shown electrical motor.The electrical pump 12 is controlled by the control unit 10. The coolant in the first line6a has the task to cool an oil in the heat eXchanger 13. The oil is circulates by an oilpump 14 in an oil circuit 15 cooling the electrical machine 3. Altematively or incombination, the coolant may cool components associated to the electrical machine 3such an electrical energy storage and power electronics controlling the flow of electricenergy between the electrical machine 3 and the electrical energy storage. TheauXiliary line circuit 6 comprises a first return line 6b directing coolant from a positiondownstream of the heat eXchanger 13 to the engine inlet line 4a. The auXiliary linecircuit 6 comprises a second return line 6c directing coolant from a positiondownstream of the heat eXchanger 13 to the radiator inlet line 5a. A valve device in theform of a third three way valve 16 is arranged in a connection point of the secondreturn line 6c and the radiator inlet line 5a.
    In this case, a charge air Cooler 17 is arranged in a position upstream of the radiatorll. A radiator fan 19, an auXiliary radiator fan 20 and the ram air provide a cooling airstream through the charge air cooler 15 and the radiator ll during operation of thevehicle 1. The radiator fan 19 is driven by the combustion engine 2. The auXiliaryradiator fan 20 is driven by an electric motor 21. Thus, the auXiliary radiator fan 20 isdriven independently of the radiator fan 19. The control unit 10 controls the speed ofthe auXiliary radiator fan 20. A first temperature sensor 22 senses the temperature ofthe coolant in the engine outlet line 4b. Thus, the first temperature sensor 22 senses atemperature related to the temperature of the combustion engine 2. A secondtemperature sensor 23 senses the temperature of the coolant in the auXiliary circuit 6 inan upstream position of the heat eXchanger 13. Thus, the second temperature sensor 23senses a temperature related to the temperature of the electrical machine 3.
    During operation when only the electrical machine 3 is in operation, the combustionengine 2 does not need to be cooled. Since the first coolant pump 7 is driven by thecombustion engine 2, the first coolant pump 7 is not either in operation. Thus, there isno coolant flow in the main circuit 4. The control unit 10 sets the first three way valve8 and the second three way valve 9 in closed positions in which they prevent a coolantflow between the main line circuit 4 and the radiator circuit 5. In this case, theelectrical machine 3 is to be cooled. The control unit ll receives information from thetemperature sensor 23 about the temperature of the coolant leaving the heat eXchanger13 which is related to the temperature of the electrical machine 3. In view of thisinformation, the control unit ll activates the second coolant pump 12 such that itcirculates a suitable coolant flow through the heat eXchanger 13 in the auxiliary linecircuit 6. The control unit 10 sets the third three way valve 16 in a position such that itdirects the coolant flow in the second retum line 6c to the radiator inlet line Sa and theradiator ll. When the coolant has been cooled in the radiator ll, it is received in theradiator outlet line 5b. Since the second three way valve 9 is in a closed position, theentire coolant flow in the radiator outlet line Sb is directed to the auXiliary circuit line6. Furthermore, the control unit 10 has the possibility to start the auxiliary coolant fan20 in order to cool the coolant to a lower temperature in the radiator ll before it isdirected to the heat eXchanger 13.
    During operation When the combustion engine 2 only is in operation, the electricalmachine 3 does not need to be cooled. The control unit l0 shut off the electrical pumpl2 and sets the third three Way Valve l6 in a closed position such that the coolant floWin the auXiliary line circuit is stopped. Since the first coolant pump 7 is driven by thecombustion engine 2, the coolant pump 7 circulates a coolant floW in the main linecircuit 4. The control unit ll receives information from the temperature sensor 22about the temperature of the coolant in the engine outlet line 4b Which is related to thetemperature of the combustion engine 2. In case the combustion engine 2 has a too lowtemperature, the control unit l0 sets the first three Way Valve 8 in a position such that itdirects the coolant floW in the second return line 4b to the radiator bypass line 4c.Further, the control unit l0 sets the second three Way Valve 9 in a position such that itdirects the coolant floW from the radiator bypass line 4c to the engine inlet line 4a. lncase the combustion engine 2 has a too high temperature, the control unit l0 sets thefirst three Way Valve 8 in a position such that it directs the coolant floW in the secondretum line 4b to the radiator inlet line Sa. Further, the control unit l0 sets the secondthree Way Valve 9 in a position such that it directs the coolant floW from the radiatoroutlet line Sb to the engine inlet line 4a. Also in this case, the control unit l0 has thepossibility to start the auXiliary coolant fan 20 in order to cool the coolant to a lowertemperature in the radiator ll before it is directed to the combustion engine 2.
    During operation When the combustion engine 2 and the electrical machine 3 is inoperation, the combustion engine 2 and the electrical machine 3 are to be cooled. Thecontrol unit l0 receives information about the temperatures of the combustion engine 2and the electrical machine 3 from the temperature sensors 22, 23. In view of thisinformation, the control unit l0 controls the first three Way Valve 8 such that a part ofthe coolant floW in the engine outlet line 4b is directed to the radiator bypass line 4cand a remaining part of the coolant floW to the radiator inlet line Sa. The control unitl0 controls the second three Way Valve 9 such that a part of the coolant floW in theradiator bypass line 4c is directed to engine inlet line 4a and a remaining part of thecoolant floW in the radiator bypass line 4c is directed to the radiator outlet line 5b. Thecontrol unit l0 controls the second coolant pump l2 in order to provide a suitable11coolant flow in the auxiliary Circuit 6. The control unit 10 controls the third three wayvalve 16 in order to supply a part of the coolant flow in the auXiliary circuit 6, via thefirst return line 6b, to the engine inlet line 4a and a remaining part of the coolant flowin the auXiliary circuit 6, via the second return line 6c, to the radiator inlet line Sa. Thecoolant flow in the first return line 6b is mixed with the coolant in the engine inlet line4a before the miXture is directed to the combustion engine 2. The coolant flow in thesecond return line 6c is mixed with the coolant from the engine outlet line 4b in theradiator inlet line Sa before the miXture is directed to the radiator ll. In this case, it ispossible for the control unit l0 to control the three way valves 8, 9, l6 such thatcoolant at a suitable temperature and flow rate is directed to the combustion engine 2and coolant at a suitable temperature and a flow rate is directed to the heat exchanger13 for cooling of the electrical machine 3.
    Fig. 2 shows a second embodiment of the cooling system. In this case, the radiator hasbeen divided into a main radiator ll and an auxiliary radiator lla. In this case, thecoolant flow in the second return line 6c of the auXiliary line circuit 6 is directed to amain radiator inlet Sa. Alternatively, the coolant flow in the second retum line 6c isdirected to an auXiliary radiator inlet line Sa' , which is indicated with dotted line inFig. 2. The main radiator ll comprises a main radiator outlet line Sb and the auXiliaryradiator ll' comprises an auXiliary radiator outlet line Sb”. A valve member 24 isarranged in a connection line 2S between the main radiator outlet line Sb and theauxiliary radiator outlet line Sb”. The auXiliary line circuit 6 receives coolant from theauXiliary radiator outlet line Sb' or the main radiator outlet line Sb.
    Fig. 3 shows a first embodiment of a divided radiator according to the above. In thiscase, coolant is directed from the main radiator inlet line Sa to an inlet tube l la of themain radiator ll. The auxiliary radiator ll' is arranged below the main radiator ll. Asmall passage 26 is arranged between a lower portion of the inlet tube lla of the mainradiator ll and an upper portion of an inlet tube lla' of the auxiliary radiator ll”.Thus, a small part of the coolant flow rate supplied to the main radiator ll is directedto the auxiliary radiator ll”. A main part of the coolant flow is directed from the inlettank lla, via a cooling portion llb in which the coolant is cooled by an air stream, to12an Outlet tube llc of the main radiator ll. The outlet tank llc is connected to the mainradiator outlet line Sb. Thus, a small part of the coolant flow entering the main radiatorinlet tank lla is directed, via the small passage 26, to the auXiliary radiator inlet tanklla”. The coolant in the auxiliary radiator inlet tank lla' is directed, via a coolingportion llb' in which the coolant is cooled by an air stream, to an outlet tube llc' ofthe auxiliary radiator ll”. The auXiliary radiator outlet tank llc' is connected to theauxiliary radiator outlet line Sb”. An auXiliary radiator fan 20 is able to provide acooling air stream through the auXiliary radiator ll”. The small coolant flow throughthe auxiliary radiator ll' results in that the coolant in the auxiliary radiator outlet lineSb' usually has a lower temperature than the coolant in the radiator outlet line Sb.
    Fig. 4 shows a second embodiment of a divided radiator according to the above. ln thiscase, the coolant in the second retum line 6c is directed to an auXiliary inlet line Sa'marked with dotted lines in Fig. 2. The coolant is cooled in the auXiliary radiator ll'before it enters the auxiliary radiator outlet line Sb”. The coolant in the engine outletline 4b is directed to the main radiator inlet line Sa. The coolant is cooled in the mainradiator ll before it enters the radiator outlet line Sb. The coolant flow through theauxiliary radiator ll' is dimensioned to be smaller than the coolant flow through themain radiator ll. As a consequence, the coolant in the auxiliary radiator outlet line Sb'directed to the further object 3 usually has a lower temperature than the coolant in theradiator outlet line Sb directed to the combustion engine 2.
    Fig. S shows a third embodiment of a divided radiator according to the above. ln thiscase, the coolant in the second return line 6c and the engine outlet line 4b is directed tothe main radiator inlet line Sa. The main radiator inlet line Sa directs the coolant flowto the inlet tank lla of the main radiator ll. The coolant flow is directed from the inlettank lla, via a cooling portion llb, to an outlet tube llc of the main radiator ll. lnthis case, there is an opening between a lower part of the main radiator outlet tank lland an upper portion of an auXiliary radiator inlet tube lla”. Consequently, a part ofthe coolant flow is directed from the main radiator outlet tank llc to the main radiatoroutlet line Sb and a remaining part of the coolant enters the auxiliary radiator inlet tubella”. The coolant flow in the auXiliary radiator ll' is directed from the inlet tank lla°,13via a Cooling portion llh', to the outlet tube llc' of the auXiliary radiator ll'. In thiscase, the coolant flow leaving the auXiliary radiator via the auXiliary radiator outlet lineSh' has been cooled in two step. Consequently, the coolant in the auXiliary radiatoroutlet line Sh' has a lower temperature than the coolant in the radiator outlet line Sh.
    During operation of the emhodiment shown in Fig. 2, when only the electrical machine3 needs to he cooled, the second coolant pump l2 circulates a coolant flow through theauXiliary line circuit 6 and the radiator circuit S. There is no coolant flow in the maincircuit 4. The control unit l0 sets the first three way valve 8 and the second three wayvalve 9 in closed positions in which they prevent a coolant flow hetween the main linecircuit 4 and the radiator circuit S. The control unit ll receives information from thetemperature sensor 23 ahout the temperature of the coolant leaving the heat eXchangerl3 which is related to the temperature of the electrical machine 3. In view of thisinformation, the control unit ll activates the second coolant pump l2 such that itcirculates a suitahle coolant flow rate through the heat eXchanger l3 in the auxiliaryline circuit 6. In the emhodiments shown in Fig. 4 and 6, the control unit l0 mayregulate the valve memher 24 such that coolant from the main radiator outlet line Sa orcoolant from the auXiliary radiator outlet line Sa' is directed to the auXiliary line circuit6 and the heat exchanger l3.
    During operation when the comhustion engine 2 only is in operation, the electricalmachine 3 does not need to he cooled. The control unit 10 shut off the second coolantpump l2 such that the coolant flow in the auXiliary line circuit 6 is stopped. Since thefirst coolant pump 7 is driven hy the comhustion engine 2, it is automatically inoperation as soon as the comhustion engine 2 is in operation. The first coolant pump 7circulates a coolant flow in the main line circuit 4. The control unit ll receivesinformation from the temperature sensor 22 ahout the temperature of the coolant in theengine outlet line 4h which is related to the temperature of the comhustion engine 2. Incase the comhustion engine 2 has a too low temperature, the control unit l0 sets thefirst three way valve 8 in a position such that it directs the coolant flow in the secondretum line 4h to the radiator hypass line 4c. Further, the control unit 10 sets the secondthree way valve 9 in a position such that it directs the coolant flow from the radiator14bypass line 4c to the engine inlet line 4a. In case the combustion engine 2 has a toohigh temperature, the control unit 10 sets the first three way Valve 8 in a position suchthat it directs the coolant flow in the second return line 4b to the radiator inlet line Sa.Further, the control unit l0 sets the second three way Valve 9 in a position such that itdirects the coolant flow from the radiator outlet line Sb to the engine inlet line 4a. Alsoin this case, the control unit l0 has the possibility to start the auXiliary coolant fan 20in order to cool the coolant to a lower temperature in the radiator ll before it isdirected to the combustion engine 2. ln the embodiments shown in Fig. 4 and 6, thecontrol unit l0 may open the Valve member 24 such that coolant from the mainradiator outlet line Sa and coolant from the auXiliary radiator outlet line Sa' aredirected to the engine inlet line 4a.
    During operation when the combustion engine 2 and the electrical machine 3 is inoperation, the combustion engine 2 and the electrical machine are to be cooled. Thecontrol unit l0 receives information about the temperatures of the combustion engine 2and the electrical machine 3 from the temperature sensors 22, 23. In view of thisinformation, the control unit l0 controls the first three way Valve 8 such that a part ofthe coolant flow from the engine outlet line 4b is directed to the radiator bypass line 4cand a remaining part of the coolant flow to the radiator inlet line Sa. The control unitl0 controls the second three way Valve 9 such that a part of the coolant flow in theradiator bypass line 4c is directed to engine inlet line 4a and a remaining part of thecoolant flow in the radiator bypass line 4c is directed to the radiator outlet line Sb. Thecontrol unit l0 controls the second coolant pump l2 in order to provide a suitablecoolant flow in the auXiliary circuit 6. Furthermore, it is possible for the control unit l0to control the three way Valves 8, 9 and the Valve member 24 such that coolant at asuitable temperature and flow rate is directed to the combustion engine 2 and coolantat a lower temperature and a flow rate is directed to the heat eXchanger l3 for coolingof the electrical machine 3.
    The invention is not restricted to the described embodiment but may be Varied freelywithin the scope of the claims.
    权利要求:
    Claims (13)
    [1] l. A cooling system configured to cool a combustion engine (2) and at least one furtherobject (3) in a vehicle (l), Wherein the cooling system comprises - a radiator circuit comprising a radiator (ll, ll°), a radiator inlet line (Sa, Sa°)directing coolant to the radiator (ll, ll°) and a radiator outlet line (Sb, Sb°) receivingcoolant from the radiator (ll, ll°), and - a main line circuit (4) comprising a first coolant pump (7) circulating coolant in themain circuit (4), a radiator bypass line (4c) directing coolant past the radiator (ll, ll°),a first valve device (8) receiving coolant from the combustion engine (2) and directingit to the radiator inlet line (Sa, Sa°) and/or to the radiator bypass line (4c), an engineinlet line (4a) directing coolant to the combustion engine (2), and a second valvedevice (9) receiving coolant from the radiator outlet line (Sa, Sa°) and/or the radiatorbypass line (4c) and directing it to the radiator outlet line (Sa, Sa°) and/or the engineinlet line (4a), characterized in that the cooling system comprises - an auXiliary circuit (6) comprising an second coolant pump (l2) configured tocirculate coolant in the auXiliary circuit (6), a cooling line (6a) receiving coolant fromthe radiator outlet line (Sb, Sb°) for cooling of the further object (3), a first return line(6b) directing coolant from the cooling line (6a) to the engine inlet line (4a) and asecond return line (6c) directing coolant from the cooling line (6a) to the radiator inlet line (Sa, Sa°).
    [2] 2. A cooling system according to claim l, characterized in that the second retum line(6c) comprises a third valve device (l6) controlling the coolant flow in the first retum line (6b) and the second return line (6c).
    [3] 3. A cooling system according to claim 2, characterized in that the third valve device(l6) is a three Way valve arranged in a connection point of the second retum line (6c) and the radiator inlet line (Sa, Sa°). 16
    [4] 4. A cooling system according to any one of the preceding claims, characterized in that the first coolant pump (l2) is mechanically driven.
    [5] 5. A cooling system according to any one of the preceding claims, characterized in that the second coolant pump (l2) is electrically driven.
    [6] 6. A cooling system according to any one of the preceding claims, characterized in that the further object is an electrical machine (3).
    [7] 7. A cooling system according to any one of the preceding claims, characterized in thata cooling air stream through the radiator (ll, ll°) is provided by a mechanically driven radiator fan (19) and an electrically driven auXiliary radiator fan (20).
    [8] 8. A cooling system according to any one of the preceding claims, characterized in that the radiator is divided in a main radiator (ll) and an auXiliary radiator (l l°).
    [9] 9. A cooling system according to claim 8, characterized in that the auxiliary line circuit(6) receives coolant from a main radiator outlet line 5b and/or an auXiliary radiator outlet line (5b°).
    [10] l0. A cooling system according to claim 9, characterized in that it comprises aconnection line (25) arranged between the main radiator outlet line 5b and the auxiliaryradiator outlet line (5b°) and a valve member (24) controlling the coolant floW through the connection line (25).
    [11] ll. A cooling system according to any one of the preceding claims, characterized inthat it comprises a control unit (l0) configured to receive information about at leastone operating parameter (23, 24) and to control including valves (8, 9, l6, 24) in view of information about said operating parameter (23, 24).
    [12] l2. A cooling system according to any one of the preceding claims, characterized in that the first valve device is a three Way valve (8). 17
    [13] 13. A Cooling system according to any one of the preceding claims, characterized in that the second Valve device is a three Way Valve (9).
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    同族专利:
    公开号 | 公开日
    DE102017005336A1|2017-12-14|
    SE541223C2|2019-05-07|
    DE102017005336B4|2021-08-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    SE533942C2|2008-06-09|2011-03-08|Scania Cv Ab|Arrangement of a supercharged internal combustion engine|
    US9096207B2|2010-12-31|2015-08-04|Cummins Inc.|Hybrid vehicle powertrain cooling system|
    SE541792C2|2016-05-19|2019-12-17|Scania Cv Ab|A cooling system for a combustion engine and a further object|
    SE539919C2|2016-05-19|2018-01-16|Scania Cv Ab|A cooling system for a combustion engine and a further object|DE102018211425A1|2018-07-10|2020-01-16|Volkswagen Aktiengesellschaft|Cooling system for a motor vehicle with cover devices for influencing the supply of cooling air to coolant coolers|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1650827A|SE541223C2|2016-06-13|2016-06-13|A cooling system for a combustion engine and a further object|SE1650827A| SE541223C2|2016-06-13|2016-06-13|A cooling system for a combustion engine and a further object|
    DE102017005336.7A| DE102017005336B4|2016-06-13|2017-06-02|Cooling system for an internal combustion engine and another object|
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