CN109808548B - Thermal management system and method of extended range electric vehicle and vehicle - Google Patents
Thermal management system and method of extended range electric vehicle and vehicle Download PDFInfo
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- CN109808548B CN109808548B CN201811645707.2A CN201811645707A CN109808548B CN 109808548 B CN109808548 B CN 109808548B CN 201811645707 A CN201811645707 A CN 201811645707A CN 109808548 B CN109808548 B CN 109808548B
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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Abstract
The invention discloses a thermal management system and method of an extended range electric vehicle and the vehicle, and relates to the technical field of vehicles. The thermal management system includes an engine cooling circuit for cooling an engine; a motor cooling circuit for cooling the motor; the power battery circulation loop is used for heating or cooling the power battery; a first heat exchanger connected with the engine cooling circuit and the motor cooling circuit; the second heat exchanger is connected with the motor cooling loop and the power battery circulating loop; the heat generated by the engine is transferred to the first heat exchanger through the engine cooling loop and then transferred to the second heat exchanger through the motor cooling loop until entering the power battery circulation loop to heat the power battery. The invention also provides a corresponding method and a vehicle, and the vehicle comprises the thermal management system. The invention can effectively improve the energy utilization rate.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a thermal management system and method of an extended-range electric vehicle and the vehicle.
Background
Under the drive of increasingly stringent automobile fuel consumption and emission regulations, more and more host plants start the development of pure electric vehicles, but the pure electric vehicles still face various technical difficulties at present, so that the pure electric vehicles still cannot be popularized in a large area at present.
One of the problems is that when the ambient temperature around the vehicle is low, due to the heating requirements of a power battery and a passenger compartment under the low-temperature condition, the existing solution is to adopt PTC electric heating, and the consequence of the PTC electric heating is that a large amount of energy is consumed by the PTC electric heating, so that the pure electric endurance mileage of the vehicle is greatly reduced, the use experience of a user is greatly reduced, and the large-area popularization of the pure electric vehicle is greatly influenced.
Disclosure of Invention
It is an object of a first aspect of the present invention to provide a thermal management system for an extended range electric vehicle that is capable of utilizing heat generated by the engine to heat the power battery and the passenger compartment.
It is another object of the first aspect of the present invention to provide a thermal management system for an extended range electric vehicle that can improve the range of the vehicle.
It is an object of a second aspect of the present invention to provide a method of thermal management for an extended range electric vehicle that is capable of utilizing heat generated by the engine to heat the power battery and the passenger compartment.
It is an object of a third aspect of the invention to provide a vehicle comprising a thermal management system as described above, which thermal management system is capable of improving the range of the vehicle.
According to a first aspect of the invention, there is provided a thermal management system for an extended range electric vehicle, comprising:
an engine cooling circuit for cooling the engine;
a motor cooling circuit for cooling the motor;
the power battery circulation loop is used for heating or cooling the power battery;
a first heat exchanger connected with the engine cooling circuit and the motor cooling circuit; and
the second heat exchanger is connected with the motor cooling loop and the power battery circulation loop;
the heat generated by the engine is transferred to the first heat exchanger through the engine cooling loop and then transferred to the second heat exchanger through the motor cooling loop until entering the power battery circulation loop to heat the power battery.
Further, the engine cooling circuit comprises an engine water jacket, a first electronic control valve and an engine electronic water pump, the engine water jacket, the first electronic control valve, the first heat exchanger and the engine electronic water pump are sequentially connected, and engine coolant in the engine cooling circuit starts from the engine electronic water pump, flows through the engine water jacket, the first electronic control valve and the first heat exchanger, and finally returns to the engine electronic water pump.
Further, the engine cooling circuit further comprises a thermostat and an engine radiator;
the engine cooling liquid starts from the engine electronic water pump, flows through the engine water jacket and the thermostat and finally returns to the engine electronic water pump; and
the engine cooling liquid starts from the engine electronic water pump, flows through the engine water jacket, the thermostat and the engine radiator, and finally returns to the engine electronic water pump.
Further, the motor cooling circuit comprises a motor controller water jacket, a motor water jacket, a second electric control valve, a motor radiator, a third electric control valve and a motor electronic water pump, wherein the motor controller water jacket, the motor water jacket, the second electric control valve, the motor radiator, the third electric control valve, the motor electronic water pump and the first heat exchanger are sequentially connected, and motor cooling liquid in the motor cooling circuit starts from the motor electronic water pump, flows through the first heat exchanger, the motor controller water jacket, the motor water jacket, the second electric control valve, the motor radiator and the third electric control valve, and finally returns to the motor electronic water pump.
Further, the motor cooling loop further comprises a heating electronic water pump, an electric heater, a warm air device, a fourth electronic control valve, a fifth electronic control valve and the second heat exchanger;
the motor cooling liquid starts from the motor electronic water pump, flows through the first heat exchanger, the motor controller water jacket, the motor water jacket, the second electric control valve, the heating electronic water pump, the electric heater, the warm air device, the fourth electric control valve, the second heat exchanger, the fifth electric control valve and the third electric control valve, and finally returns to the motor electronic water pump; and
the motor cooling liquid flows from the heating electronic water pump, flows through the electric heater, the warm air device, the fourth electric control valve, the second heat exchanger and the fifth electric control valve, and finally returns to the heating electronic water pump.
Further, the power battery circulation loop comprises the power battery and the second heat exchanger, and power battery cooling liquid in the power battery circulation loop starts from the second heat exchanger, flows through the power battery and finally returns to the second heat exchanger.
Further, still include: the cooling system comprises an environment temperature sensor, an engine water temperature sensor, a motor water temperature sensor and a battery water temperature sensor, wherein the environment temperature sensor is used for detecting the environment temperature, the engine water temperature sensor is used for detecting the temperature of engine cooling liquid, the motor water temperature sensor is used for detecting the temperature of the motor cooling liquid, and the battery water temperature sensor is used for detecting the temperature of the power battery cooling liquid.
According to a second aspect of the present invention, there is provided a method of thermal management of an extended range electric vehicle, comprising:
starting an engine cooling circuit;
starting a motor cooling loop;
starting a power battery circulation loop;
the heat generated by the engine is transferred to the first heat exchanger through the engine cooling loop and then transferred to the second heat exchanger through the motor cooling loop until entering the power battery circulating loop to heat the power battery.
Further, the starting engine cooling circuit includes:
detecting whether the ambient temperature is lower than a first temperature;
if yes, detecting whether the temperature of the engine coolant is higher than a second temperature;
if the temperature of the engine coolant is higher than the second temperature, controlling the engine coolant to flow from the engine electronic water pump, flow through the engine water jacket, the first electronic control valve and the first heat exchanger, and finally return to the engine electronic water pump; and is
Controlling the engine coolant to flow from the engine electronic water pump, pass through the engine water jacket and the thermostat and finally return to the engine electronic water pump; and is
Controlling the engine coolant to flow from the engine electronic water pump, pass through the engine water jacket, the thermostat and the engine radiator and finally return to the engine electronic water pump;
if the temperature of the engine coolant is higher than the second temperature, the starter motor cooling circuit includes:
controlling the motor cooling liquid to flow from a motor electronic water pump, flow through a first heat exchanger, a motor controller water jacket, a motor water jacket, a second electric control valve, a heating electronic water pump, an electric heater, a warm air device, a fourth electric control valve, a second heat exchanger, a fifth electric control valve and a third electric control valve, and finally return to the motor electronic water pump;
if the temperature of the engine coolant is lower than a second temperature, controlling the engine coolant to start from the engine electronic water pump, flow through the engine water jacket and the thermostat, and finally return to the engine electronic water pump;
if the temperature of the engine coolant is less than a second temperature, the starter motor cooling circuit includes: controlling the motor cooling liquid to flow from the motor electronic water pump, flow through the first heat exchanger, the motor controller water jacket, the motor water jacket, the second electronic control valve and the third electronic control valve, and finally return to the motor electronic water pump; and is
Controlling the motor cooling liquid to flow from the heating electronic water pump, flow through the electric heater, the warm air device, the fourth electric control valve, the second heat exchanger and the fifth electric control valve, and finally return to the heating electronic water pump;
wherein the thermal management method further comprises:
detecting whether the temperature of the cooling liquid of the power battery is higher than a third temperature;
and if so, controlling the motor cooling liquid to directly flow to the fifth electric control valve from the fourth electric control valve.
According to a third aspect of the invention, the invention provides a vehicle, which comprises a vehicle body and further comprises the thermal management system, wherein the thermal management system is connected with the vehicle body.
According to the heat management system and method of the range-extended electric vehicle and the vehicle, the range-extended system is added on the pure electric vehicle, when the vehicle is in a low-temperature environment, the range-extended engine is started to start the vehicle, and therefore the problem of difficulty in low-temperature cold start of the vehicle due to the charge and discharge limit value of the power battery in the low-temperature environment is well solved.
Further, by adding a first heat exchanger and starting the extended range engine, the heat management system of the invention can transfer heat generated by the engine to the first heat exchanger from the engine cooling loop and then to the second heat exchanger from the motor cooling loop until the heat enters the power battery circulation loop to heat the power battery. Therefore, the heat management system can fully utilize energy, can effectively save the energy of the vehicle compared with a method of heating a power battery by PTC electric heating, and the part of energy can be used for providing driving power, so that the driving mileage of the vehicle can be effectively improved, and the large-area popularization of electric vehicles is facilitated. Meanwhile, on the basis of keeping the heat management structure of the pure electric vehicle unchanged, the heat of the engine is reasonably utilized only by adding the first heat exchanger, so that the development cost is further reduced.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a functional block diagram of a thermal management system of an extended range electric vehicle according to one embodiment of the present invention;
FIG. 2 is a functional block diagram of a thermal management system of an extended range electric vehicle according to another embodiment of the present invention;
FIG. 3 is a flow chart of a method of thermal management of an extended range electric vehicle according to one embodiment of the present invention.
Detailed Description
FIG. 1 is a functional block diagram of a thermal management system of an extended range electric vehicle according to one embodiment of the present invention. As shown in fig. 1, the thermal management system of the extended range electric vehicle includes an engine cooling circuit 1, a motor cooling circuit 2, a power battery circulation circuit 3, a first heat exchanger 4, and a second heat exchanger 5. The engine cooling circuit 1 is used to cool the engine 11. The motor cooling circuit 2 is used for cooling the motor 21. The power battery circulation loop 3 is used for heating or cooling the power battery 31. The first heat exchanger 4 is connected to the engine cooling circuit 1 and the motor cooling circuit 2. The second heat exchanger 5 is connected with the motor cooling loop 2 and the power battery circulation loop 3. The heat generated by the engine 11 is transferred to the first heat exchanger 4 by the engine cooling circuit 1, and then transferred to the second heat exchanger 5 by the motor cooling circuit 2 until entering the power battery circulation circuit 3 to heat the power battery 31.
According to the thermal management system of the range-extended electric vehicle, the range-extended system is added on the pure electric vehicle, when the vehicle is in a low-temperature environment, the range-extended engine is started to start the vehicle, and therefore the problem of difficulty in low-temperature cold start of the vehicle due to the charge and discharge limit value of the power battery in the low-temperature environment is well solved.
Further, by adding a first heat exchanger and starting the extended range engine, the thermal management system of the present invention can transfer the heat generated by the engine from the engine cooling circuit 1 to the first heat exchanger 4, and then from the electric machine cooling circuit 2 to the second heat exchanger 5, until entering the power battery circulation circuit 3 to heat the power battery. Therefore, the heat management system can fully utilize energy, can effectively save the energy of the vehicle compared with a method of heating a power battery by PTC electric heating, and the part of energy can be used for providing driving power, so that the driving mileage of the vehicle can be effectively improved, and the large-area popularization of electric vehicles is facilitated. Meanwhile, on the basis of keeping the heat management structure of the pure electric vehicle unchanged, the heat of the engine is reasonably utilized only by adding the first heat exchanger, so that the development cost is further reduced.
Specifically, in one embodiment of the present invention, FIG. 2 is a functional block diagram of a thermal management system of an extended range electric vehicle, according to another embodiment of the present invention. As shown in fig. 2, the engine cooling circuit 1 includes an engine water jacket 12, a first electronic control valve 13, the first heat exchanger 4 and an engine electronic water pump 14 which are connected in sequence, and engine coolant in the engine cooling circuit 1 flows from the engine electronic water pump 14, through the engine water jacket 12, the first electronic control valve 13 and the first heat exchanger 4, and finally returns to the engine electronic water pump 14.
In this way, when the engine 11 is operating, the heat it generates can be transferred through the first heat exchanger 4 and eventually used to heat the power cell 31. Therefore, the heat management system can greatly improve the energy utilization rate.
Further, as shown in fig. 2, the engine cooling circuit 1 may further include a thermostat 15 and an engine radiator 16.
The engine coolant flows from the engine electronic water pump 14, through the engine water jacket 12 and the thermostat 15, and finally returns to the engine electronic water pump 14.
The flow direction of the engine coolant is set to the above-described flow direction, which is set in consideration of the fact that the temperature of the engine coolant is low (generally regarded as not reaching 70 ℃) when the engine 11 is just started, and the main purpose is to raise the temperature of the coolant at this time, and thus the heat generated by the engine is mainly used to heat the engine coolant. Meanwhile, the temperature of the engine coolant is quickly increased, and the emission of harmful substances of the engine is favorably reduced.
Besides, the engine coolant can also flow from the engine electronic water pump 14, through the engine water jacket 12, the thermostat 15 and the engine radiator 16, and finally return to the engine electronic water pump 14.
The flow direction of the engine coolant is set to the above flow direction, which is set to dissipate heat generated by the engine through the engine radiator 16, in consideration of the fact that when the temperature of the engine coolant is high, it is necessary to dissipate a part of heat in the engine coolant to continue cooling the engine.
Further, as shown in fig. 2, the motor cooling circuit 2 includes a motor controller water jacket 22, a motor water jacket 23, a second electronic control valve 24, a motor radiator 25, a third electronic control valve 26, a motor electronic water pump 27, and the first heat exchanger 4, which are connected in sequence, and the motor coolant in the motor cooling circuit 2 starts from the motor electronic water pump 27, flows through the first heat exchanger 4, the motor controller water jacket 22, the motor water jacket 23, the second electronic control valve 24, the motor radiator 25, and the third electronic control valve 26, and finally returns to the motor electronic water pump 27.
Setting the flow direction of the motor coolant to the above-described flow direction is set in consideration of the need to dissipate part of the heat when the temperature of the motor coolant in the motor cooling circuit 2 is too high, so that the motor coolant can better cool the motor 21 and the motor controller.
Further, as shown in fig. 2, the motor cooling circuit 2 further includes a heating electric water pump 28, an electric heater 29, a heater 6, a fourth electric control valve 7, a fifth electric control valve 8, and the second heat exchanger 5.
The motor coolant can flow from the motor electronic water pump 27, through the first heat exchanger 4, the motor controller water jacket 22, the motor water jacket 23, the second electronic control valve 24, the heating electronic water pump 28, the electric heater 29, the heater 6, the fourth electronic control valve 7, the second heat exchanger 5, the fifth electronic control valve 8 and the third electronic control valve 26, and finally back to the motor electronic water pump 27. It should be noted that, here, only the motor electronic water pump 27 or the heating electronic water pump 28 needs to operate, and does not need to operate together.
The flow direction of the motor coolant is set to the above-mentioned flow direction because when the engine 11 generates heat and needs to use the heat for heating the power battery 31, the heat generated by the engine 11 can be transferred to the second heat exchanger 5 through the first heat exchanger 4 and finally enters the power battery circulation circuit 3 to heat the power battery 31 and the passenger compartment.
Furthermore, the motor coolant may also flow from the heating electronic water pump 28, through the electric heater 29, the heater unit 6, the fourth electrically controlled valve 7, the second heat exchanger 5, and the fifth electrically controlled valve 8, and finally back to the heating electronic water pump 28.
The above-described flow direction of the motor coolant is set to a flow direction in which sufficient heat cannot be generated for heating the power battery 31 and the passenger compartment when the engine 11 is just operating, and for this reason, the above-described flow direction is set, and the cycle is mainly to transfer heat generated by the electric heater 29 to the heating device 6 and the second heat exchanger 5 for heating the passenger compartment and the power battery 31, respectively, and of course, the energy source of the electric heater 29 is a part of the output power of the engine 11. Here, the electric heater 29 may be a PTC electric heater. The flow direction of the motor coolant corresponds to the case where the temperature of the engine coolant is low (it is considered that the temperature is not higher than 70 ℃) immediately after the engine 11 starts operating. In this case, the engine 11 outputs mainly power for driving the vehicle and part of the power for supplying energy to the electric heater 29 to meet the heating requirements of the power battery 31 and the passenger compartment.
Meanwhile, as shown in fig. 2, the power battery circulation loop 3 includes the power battery 31 and the second heat exchanger 5, and the power battery coolant in the power battery circulation loop 3 is sent out by the second heat exchanger 5, flows through the power battery 31, and finally returns to the second heat exchanger 5.
In this way, the heat in the second heat exchanger 5 can enter the power battery 31 to raise the temperature of the power battery 31. Here, when the temperature of the power battery 31 reaches a predetermined temperature, for example, 10 ℃, at this time, the power battery 31 is already able to operate normally, and therefore, the motor coolant can be caused to flow directly from the fourth electronic control valve 7 to the fifth electronic control valve 8 by controlling the fourth electronic control valve 7 and the fifth electronic control valve 8.
Meanwhile, since the second heat exchanger 5 does not need to absorb heat of the motor coolant, that is, the motor coolant does not need to absorb excessive heat from the first heat exchanger 4, it is possible to reduce the engine coolant flowing into the first heat exchanger 4 by controlling the opening degree of the first electrically controlled valve 13.
The opening of the first electronic control valve 13 is determined by the temperature of the power battery 31 and the temperature of the motor coolant, and since the heater unit 6 is located in the motor cooling circuit 2, if the heater unit 6 can provide enough heat to the passenger compartment, for example, the temperature of the motor coolant has reached 65 ℃, the opening of the first electronic control valve 13 needs to be decreased (if the opening is not decreased, the temperature of the motor coolant will continue to increase, and the heater unit 6 will not absorb more heat, so the temperature of the coolant in the motor cooling circuit 2 will be too high, which may affect the normal operation of the motor and the motor controller), and if the heat provided by the heater unit 6 is not enough to heat the passenger compartment, the opening of the first electronic control valve 13 needs to be increased. Similarly, as mentioned above, when the temperature of the power battery 31 reaches a predetermined temperature, such as 10 ℃, the opening degree of the first electrically-controlled valve 13 is also decreased, and when the power battery 31 needs to be heated, the opening degree of the first electrically-controlled valve 13 needs to be increased appropriately. This is done on the premise that sufficient heat is generated during operation of the engine 11, such as when the engine 11 has been operating for a period of time and the engine coolant has reached a certain temperature, such as 70 ℃.
In addition, as shown in fig. 2, the thermal management system further includes an ambient temperature sensor 41, an engine water temperature sensor 42, a motor water temperature sensor 43, and a battery water temperature sensor 44, wherein the ambient temperature sensor 41 is configured to detect an ambient temperature, the engine water temperature sensor 42 is configured to detect a temperature of engine coolant, the motor water temperature sensor 43 is configured to detect a temperature of motor coolant, and the battery water temperature sensor 44 is configured to detect a temperature of power battery coolant.
Further, in one embodiment of the present invention, fig. 3 is a flowchart of a thermal management method of an extended range electric vehicle according to one embodiment of the present invention. As shown in fig. 3, the thermal management method includes:
s10, starting the engine cooling circuit;
s20, starting a motor cooling loop;
s30, starting a power battery circulation loop;
the heat generated by the engine is transferred to the first heat exchanger through the engine cooling loop and then transferred to the second heat exchanger through the motor cooling loop until entering the power battery circulating loop to heat the power battery.
Specifically, said starting said engine cooling circuit comprises:
detecting whether the ambient temperature is lower than a first temperature;
if yes, detecting whether the temperature of the engine coolant is higher than a second temperature;
if the temperature of the engine coolant is higher than the second temperature, controlling the engine coolant to flow from the engine electronic water pump, flow through the engine water jacket, the first electronic control valve and the first heat exchanger, and finally return to the engine electronic water pump; and is
Controlling the engine coolant to flow from the engine electronic water pump, pass through the engine water jacket and the thermostat and finally return to the engine electronic water pump; and is
Controlling the engine coolant to flow from the engine electronic water pump, pass through the engine water jacket, the thermostat and the engine radiator and finally return to the engine electronic water pump;
if the temperature of the engine coolant is higher than the second temperature, the starter motor cooling circuit includes:
the control motor cooling liquid starts from a motor electronic water pump, flows through a first heat exchanger, a motor controller water jacket, a motor water jacket, a second electric control valve, a heating electronic water pump, an electric heater, a warm air device, a fourth electric control valve, a second heat exchanger, a fifth electric control valve and a third electric control valve, and finally returns to the motor electronic water pump.
In this way, in a low-temperature environment, such as a first temperature of-10 ℃, when the range extender engine is used to start the vehicle, and the temperature of the engine coolant is higher than a second temperature, such as 70 ℃, at this time, the engine can generate enough heat, and the heat can be transferred to the motor cooling loop through the first heat exchanger, absorbed by the heating air device and absorbed by the second heat exchanger to heat the passenger compartment and the power battery respectively. It should be noted that the engine will generate heat continuously, and the more heat is generated as the operating time increases. The heat required by the passenger compartment and the power battery is relatively stable, if the power battery is heated to 10 ℃, the heat is not required, after the passenger compartment reaches a certain temperature, the heat is not required to be provided temporarily, and the motor cooling liquid in the motor cooling loop cannot have too high temperature, if the temperature reaches 65 ℃, the heat is not required, and the heat is required to be dissipated through a radiator. Therefore, the heat entering the first heat exchanger needs to be controlled, and the key of the control is to control the opening degree of the first electrically controlled valve, and the small opening degree can reduce the heat entering the first heat exchanger. And conversely many. While the remaining engine coolant dissipates heat through the other two passageways. It can be understood that the controller in the thermal management system can monitor the working conditions of each loop and each component at any time, and further take appropriate measures to make the thermal management system work smoothly. For example, if the opening degree of the first electrically controlled valve is large, the amount of the engine coolant entering the other two passages is relatively small.
Meanwhile, if the temperature of the engine coolant is lower than a second temperature, the engine coolant is controlled to flow from the engine electronic water pump, flow through the engine water jacket and the thermostat and finally return to the engine electronic water pump;
if the temperature of the engine coolant is less than a second temperature, the starter motor cooling circuit includes:
controlling the motor cooling liquid to flow from the motor electronic water pump, flow through the first heat exchanger, the motor controller water jacket, the motor water jacket, the second electronic control valve and the third electronic control valve, and finally return to the motor electronic water pump; and is
And controlling the motor cooling liquid to flow from the heating electronic water pump, flow through the electric heater, the warm air device, the fourth electric control valve, the second heat exchanger and the fifth electric control valve and finally return to the heating electronic water pump.
This occurs when the engine coolant temperature is below a second temperature, such as 70 c, just after engine operation. At the moment, the heat generated by the operation of the engine is used for increasing the temperature of the engine coolant, meanwhile, the engine mainly outputs power for driving the vehicle, and part of the output power is used for providing energy to the electric heater so as to meet the requirements of power battery heating and passenger compartment heating.
Meanwhile, in an embodiment of the present invention, the thermal management method further includes:
detecting whether the temperature of the cooling liquid of the power battery is higher than a third temperature;
and if so, controlling the motor cooling liquid to directly flow to the fifth electric control valve from the fourth electric control valve.
Here, the third temperature may be 10 ℃. Meanwhile, when the temperature of the power battery reaches 10 ℃, the power source of the vehicle is switched to the power battery instead of the engine.
In addition, in another embodiment of the invention, a vehicle is further provided, which comprises a vehicle body and the thermal management system, wherein the thermal management system is connected with the vehicle body.
Because the vehicle comprises the thermal management system, the extended-range engine is added to the pure electric vehicle, when the vehicle is in a low-temperature environment, the extended-range engine is started to start the vehicle, and therefore the problem of difficulty in low-temperature cold start of the vehicle due to the charge and discharge limit value of the power battery in the low-temperature environment is well solved.
Further, by adding a first heat exchanger and starting the extended range engine, the heat management system of the invention can transfer heat generated by the engine to the first heat exchanger from the engine cooling loop and then to the second heat exchanger from the motor cooling loop until the heat enters the power battery circulation loop to heat the power battery. Therefore, the heat management system can fully utilize energy, can effectively save the energy of the vehicle compared with a method of heating a power battery by PTC electric heating, and the part of energy can be used for providing driving power, so that the driving mileage of the vehicle can be effectively improved, and the large-area popularization of electric vehicles is facilitated. Meanwhile, on the basis of keeping the heat management structure of the pure electric vehicle unchanged, the heat of the engine is reasonably utilized only by adding the first heat exchanger, so that the development cost is further reduced.
Thus, it should be understood by those skilled in the art that while exemplary embodiments of the present invention have been illustrated and described in detail herein, many other variations or modifications which are consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (7)
1. A thermal management system for an extended range electric vehicle, comprising:
an engine cooling circuit for cooling the engine;
a motor cooling circuit for cooling the motor;
the power battery circulation loop is used for heating or cooling the power battery;
a first heat exchanger connected with the engine cooling circuit and the motor cooling circuit; and
the second heat exchanger is connected with the motor cooling loop and the power battery circulation loop;
the heat generated by the engine is transferred to the first heat exchanger through the engine cooling loop and then transferred to the second heat exchanger through the motor cooling loop until entering the power battery circulation loop to heat the power battery;
the motor cooling loop comprises a motor controller water jacket, a motor water jacket, a second electric control valve, a motor radiator, a third electric control valve and a motor electronic water pump, wherein the motor controller water jacket, the motor water jacket, the second electric control valve, the motor radiator, the third electric control valve, the motor electronic water pump and the first heat exchanger are sequentially connected, and motor cooling liquid in the motor cooling loop starts from the motor electronic water pump, flows through the first heat exchanger, the motor controller water jacket, the motor water jacket, the second electric control valve, the motor radiator and the third electric control valve and finally returns to the motor electronic water pump;
the motor cooling loop further comprises a heating electronic water pump, an electric heater, a warm air device, a fourth electric control valve, a fifth electric control valve and the second heat exchanger;
the motor cooling liquid starts from the motor electronic water pump, flows through the first heat exchanger, the motor controller water jacket, the motor water jacket, the second electric control valve, the heating electronic water pump, the electric heater, the warm air device, the fourth electric control valve, the second heat exchanger, the fifth electric control valve and the third electric control valve, and finally returns to the motor electronic water pump; and
the motor cooling liquid flows from the heating electronic water pump, flows through the electric heater, the warm air device, the fourth electric control valve, the second heat exchanger and the fifth electric control valve, and finally returns to the heating electronic water pump.
2. The thermal management system of claim 1, wherein the engine cooling circuit comprises an engine water jacket, a first electronic control valve, and an engine electronic water pump, the engine water jacket, the first electronic control valve, the first heat exchanger, and the engine electronic water pump are connected in sequence, and engine coolant in the engine cooling circuit is routed from the engine electronic water pump, flows through the engine water jacket, the first electronic control valve, and the first heat exchanger, and finally returns to the engine electronic water pump.
3. The thermal management system of claim 2, wherein the engine cooling circuit further comprises a thermostat and an engine radiator;
the engine cooling liquid starts from the engine electronic water pump, flows through the engine water jacket and the thermostat and finally returns to the engine electronic water pump; and
the engine cooling liquid starts from the engine electronic water pump, flows through the engine water jacket, the thermostat and the engine radiator, and finally returns to the engine electronic water pump.
4. The thermal management system of claim 1, wherein the power cell circulation loop comprises the power cell and the second heat exchanger, and wherein power cell coolant in the power cell circulation loop exits the second heat exchanger, flows through the power cell, and finally returns to the second heat exchanger.
5. The thermal management system of claim 1, further comprising: an environment temperature sensor, an engine water temperature sensor, a motor water temperature sensor and a battery water temperature sensor, wherein,
the environment temperature sensor is used for detecting the environment temperature, the engine water temperature sensor is used for detecting the temperature of engine cooling liquid, the motor water temperature sensor is used for detecting the temperature of the motor cooling liquid, and the battery water temperature sensor is used for detecting the temperature of the power battery cooling liquid.
6. A method of thermal management for an extended range electric vehicle, comprising:
starting an engine cooling circuit;
starting a motor cooling loop;
starting a power battery circulation loop;
the heat generated by the engine is transferred to the first heat exchanger through the engine cooling loop and then transferred to the second heat exchanger through the motor cooling loop until entering the power battery circulating loop to heat the power battery;
the starter engine cooling circuit includes:
detecting whether the ambient temperature is lower than a first temperature;
if yes, detecting whether the temperature of the engine coolant is higher than a second temperature;
if the temperature of the engine coolant is higher than the second temperature, controlling the engine coolant to flow from the engine electronic water pump, flow through the engine water jacket, the first electronic control valve and the first heat exchanger, and finally return to the engine electronic water pump; controlling the engine coolant to flow from the engine electronic water pump, flow through the engine water jacket and the thermostat and finally return to the engine electronic water pump; and is
Controlling the engine coolant to flow from the engine electronic water pump, pass through the engine water jacket, the thermostat and the engine radiator and finally return to the engine electronic water pump;
if the temperature of the engine coolant is higher than the second temperature, the starter motor cooling circuit includes:
controlling the motor cooling liquid to flow from a motor electronic water pump, flow through a first heat exchanger, a motor controller water jacket, a motor water jacket, a second electric control valve, a heating electronic water pump, an electric heater, a warm air device, a fourth electric control valve, a second heat exchanger, a fifth electric control valve and a third electric control valve, and finally return to the motor electronic water pump;
if the temperature of the engine coolant is lower than a second temperature, controlling the engine coolant to start from the engine electronic water pump, flow through the engine water jacket and the thermostat, and finally return to the engine electronic water pump;
if the temperature of the engine coolant is less than a second temperature, the starter motor cooling circuit includes:
controlling the motor cooling liquid to flow from the motor electronic water pump, flow through the first heat exchanger, the motor controller water jacket, the motor water jacket, the second electronic control valve and the third electronic control valve, and finally return to the motor electronic water pump; and is
Controlling the motor cooling liquid to flow from the heating electronic water pump, flow through the electric heater, the warm air device, the fourth electric control valve, the second heat exchanger and the fifth electric control valve, and finally return to the heating electronic water pump;
wherein the thermal management method further comprises:
detecting whether the temperature of the cooling liquid of the power battery is higher than a third temperature;
and if so, controlling the motor cooling liquid to directly flow to the fifth electric control valve from the fourth electric control valve.
7. A vehicle comprising a body, further comprising a thermal management system according to any of claims 1-5, the thermal management system being coupled to the body.
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| CN111497599B (en) * | 2020-04-26 | 2021-11-19 | 上海元城汽车技术有限公司 | Thermal management method, device and system of extended range electric vehicle |
| CN112046337A (en) * | 2020-09-03 | 2020-12-08 | 安徽维德电源有限公司 | Thermal management system of electric industrial vehicle and control method thereof |
| CN112693365B (en) * | 2021-01-04 | 2022-11-29 | 吉林大学 | Power coupling heat control system of extended range electric automobile and control method thereof |
| CN113074070A (en) * | 2021-03-29 | 2021-07-06 | 天津易鼎丰动力科技有限公司 | Method for reducing oil consumption and emission in warming process of extended-range electric automobile engine |
| CN113561852B (en) * | 2021-08-31 | 2023-07-11 | 岚图汽车科技有限公司 | Energy-saving range-extending PHEV thermal management system |
| CN115179721A (en) * | 2022-08-19 | 2022-10-14 | 中国第一汽车股份有限公司 | Vehicle thermal management system and hybrid vehicle with same |
| CN117227587B (en) * | 2023-10-17 | 2024-07-12 | 赛力斯汽车有限公司 | Low-temperature mode control method, device and equipment for range-extended automobile |
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| CN204885359U (en) * | 2015-07-16 | 2015-12-16 | 金龙联合汽车工业（苏州）有限公司 | Group battery temperature control system |
| CN106004336B (en) * | 2016-07-05 | 2018-03-06 | 重庆长安汽车股份有限公司 | A kind of thermal management system of whole of mixed electrical automobile |
| CN206664207U (en) * | 2017-03-13 | 2017-11-24 | 广州汽车集团股份有限公司 | A kind of vehicle changes in temperature circulatory system and automobile |
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| CN108281735B (en) * | 2018-01-05 | 2020-06-26 | 贵州吉利发动机有限公司 | Battery heat-insulation system and method for electric automobile |
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| CN108995552A (en) * | 2018-07-26 | 2018-12-14 | 浙江吉利新能源商用车有限公司 | A kind of heat management system and extended-range vehicle for extended-range vehicle |
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