Electric vehicle thermal management system suitable for alpine regions and control method

Abstract

The invention discloses an electric vehicle thermal management system suitable for an alpine region and a control method, and belongs to the technical field of automobiles, the electric vehicle thermal management system suitable for the alpine region comprises a warm air heating loop, a fuel oil heating loop and a control loop, the battery heat management loop comprises a first heat exchanger and a second heat exchanger, the battery pack water cooling plate is selectively communicated with the first heat exchanger or the second heat exchanger, the first heat exchanger is selectively communicated with the warm air heating loop, and the second heat exchanger is selectively communicated with the refrigerating loop; and the motor heat dissipation loop comprises a heat dissipation device, and the motor heat dissipation loop is selectively communicated with the warm air heating loop. The fuel heater with the corresponding power is selected only by referring to the maximum heating requirement of the system, and the rest are controlled and adjusted by the system, so that the compatibility is good.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobiles, in particular to an electric vehicle thermal management system suitable for high-cold regions and a control method. BACKGROUND

[0002] When a pure electric commercial vehicle is used in a high-cold region, the power battery seriously attenuates in a low-temperature environment, and a heating device needs to be arranged to ensure the battery temperature. At present, the heating type of the power battery of a commercial vehicle has been gradually changed from film heating to water heating. With the continuous increase of the power of the power battery, the required heating power is also increasing. Taking a 600kWh power battery as an example, the required heating power is usually more than 18kW. When the vehicle is used in a cold region, the cab also has a heating demand. According to the space of the cab, the required stable heating power usually varies from 3kW to 10kW.

[0003] Two independent high-voltage PTC heaters are usually arranged at the vehicle end to meet the battery and cab heating demands. Considering heat loss, the total power of the two heaters selected is usually more than 30kW. For a pure electric vehicle, this part of the power demand seriously increases the power consumption of the whole vehicle, and intensifies the user's anxiety about the driving range of the pure electric vehicle. In view of this problem, the common solution at the vehicle end at present is to use a fuel heater to heat the battery and the cab. The most economical way is to use a large-power fuel heater to provide heat for the battery and the cab at the same time. However, the minimum stable operating power of the large-power fuel heater (usually 20%-30% of the maximum power) is usually greater than the minimum stable power demand of the cab (usually 3kW-5kW for medium and heavy trucks). This leads to the fact that when the cab heating function is used alone, the fuel heater is easy to enter the thermal protection shutdown, resulting in the failure of the heating function. In order to avoid this problem, two fuel heaters with different powers are usually used to meet the battery and cab heating demands, which increases the cost and arrangement difficulty of the whole vehicle. Users in high-cold regions usually also have the demand of preheating the battery and the cab, and corresponding solutions also need to be proposed.

[0004] Patent CN202510745520.3 discloses a thermal management system of a hybrid electric vehicle, which uses a fuel heater to heat the battery, the engine and the cab at low temperature. The battery capacity of a hybrid electric vehicle is generally small, and the required heating power is also reduced compared with a large-capacity pure electric vehicle. The patent does not involve the selection of a large-power fuel heater and the problem of considering the separate cab heating.

[0005] Patent CN202411981741.2 discloses a thermal management system of a battery and a fuel heater for a heating system. The patent does not consider the selection of a large-power fuel heater and the problem of considering the separate cab heating to avoid the thermal protection shutdown. SUMMARY

[0006] The application aims to provide a high-cold-region electric vehicle thermal management system and a control method.

[0007] The application provides the following solutions:

[0008] In a first aspect, the application discloses a high-cold-region electric vehicle thermal management system, comprising:

[0009] A warm air heating circuit, wherein the warm air heating circuit comprises a fuel heater;

[0010] A battery thermal management circuit, wherein the battery thermal management circuit comprises a first heat exchanger and a second heat exchanger, a battery pack water cooling plate is selectively connected to the first heat exchanger or the second heat exchanger, the first heat exchanger is selectively connected to the warm air heating circuit, and the second heat exchanger is selectively connected to a refrigeration circuit;

[0011] A motor heat dissipation circuit, wherein the motor heat dissipation circuit comprises a radiator, and the motor heat dissipation circuit is selectively connected to the warm air heating circuit.

[0012] Preferably, the battery thermal management circuit further comprises a first three-way reversing valve, and the battery pack water cooling plate is selectively connected to the first heat exchanger or the second heat exchanger through the first three-way reversing valve;

[0013] The warm air heating circuit further comprises a first three-way proportional valve, and the first heat exchanger is selectively connected to the warm air heating circuit through the first three-way proportional valve;

[0014] The motor heat dissipation circuit further comprises a second three-way proportional valve, and the motor heat dissipation circuit is selectively connected to the warm air heating circuit through the second three-way proportional valve; and a two-way proportional valve is connected between the warm air heating circuit and the second three-way proportional valve;

[0015] The refrigeration circuit further comprises an electronic expansion valve, and the second heat exchanger is selectively connected to the refrigeration circuit through the electronic expansion valve.

[0016] Preferably, the warm air heating circuit further comprises a warm air core, the warm air core is connected in parallel to the first heat exchanger, and the first three-way proportional valve is selectively connected to the warm air core or the first heat exchanger;

[0017] The motor cooling circuit also includes a multi-function controller heating component and a motor heating component. The multi-function controller heating component and the motor heating component are connected in parallel with the warm air heating circuit. The second three-way proportional valve can be selectively connected to the multi-function controller heating component and the motor heating component or to the warm air heating circuit.

[0018] Preferably, the warm air heating circuit further includes a fuel heater body temperature sensor and a fuel heater outlet temperature sensor. The fuel heater body temperature sensor is used to detect the temperature of the fuel heater body, and the fuel heater outlet temperature sensor is used to detect the temperature of the liquid medium flowing through the fuel heater outlet.

[0019] The battery thermal management circuit also includes a battery inlet temperature sensor for detecting the temperature of the liquid medium flowing through the battery thermal management circuit.

[0020] The motor cooling circuit also includes a radiator outlet temperature sensor for detecting the temperature of the liquid medium flowing through the motor cooling circuit.

[0021] Preferably, the battery thermal management circuit further includes a first water pump, which serves as a power source for circulating the liquid medium in the battery thermal management circuit;

[0022] The warm air heating circuit also includes a second water pump, which serves as the power source for circulating the liquid medium in the warm air heating circuit;

[0023] The motor cooling circuit also includes a third water pump, which serves as the power source for circulating the liquid medium in the motor cooling circuit.

[0024] Secondly, this application also discloses a control method for an electric vehicle thermal management system suitable for high-altitude and cold regions, used to control the aforementioned electric vehicle thermal management system suitable for high-altitude and cold regions, the control method comprising:

[0025] Upon receiving the cab heating command and the target temperature of the liquid medium in the heating circuit, the fuel heater is started. The heating circuit is connected to the heating core through the first three-way proportional valve for cab heating. The operating power of the fuel heater is adjusted according to the outlet temperature of the fuel heater.

[0026] When the temperature of the fuel heater body reaches the first preset value, the motor heat dissipation circuit is connected to the warm air heating circuit through the second three-way proportional valve to dissipate heat from the battery thermal management circuit, and the opening of the two-way proportional valve is adjusted according to the temperature of the fuel heater body.

[0027] Preferably, when the temperature of the multi-function controller heating component or the motor heating component reaches a second preset value and the temperature of the fuel heater body reaches a first preset value, the motor heat dissipation circuit is simultaneously connected to the multi-function controller heating component, the motor heating component, and the warm air heating circuit through the second three-way proportional valve.

[0028] Preferably, after receiving the battery heating command and the target temperature of the liquid medium in the battery thermal management circuit, the battery pack water cooling plate is connected to the first heat exchanger through the first three-way reversing valve, the fuel heater is started, and the battery thermal management circuit is connected to the warm air heating circuit through the first three-way proportional valve for heating the battery thermal management circuit.

[0029] Adjust the operating power of the fuel heater according to the battery inlet temperature.

[0030] Preferably, upon receiving the battery heating command and the target temperature of the liquid medium in the battery thermal management circuit, the cab heating command and the target temperature of the liquid medium in the warm air heating circuit, the first three-way reversing valve is controlled to connect the battery pack water-cooled plate to the first heat exchanger, and the first three-way proportional valve is controlled to connect the warm air heating circuit to both the warm air core and the first heat exchanger simultaneously; this is used to simultaneously perform cab heating and battery heating.

[0031] Adjust the opening of the first three-way proportional valve to control the cab heating temperature, and adjust the fuel heater power according to the battery inlet temperature.

[0032] Thirdly, the present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, and the processor executes the program to implement the steps in the control method of the electric vehicle thermal management system suitable for high-altitude and cold regions described above.

[0033] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the control method for an electric vehicle thermal management system suitable for high-altitude and cold regions as described in any one of the first aspects.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] 1. This application uses only one fuel heater to achieve stable heating of the battery and cab, reducing the overall vehicle cost and layout difficulty. Excess heat in the heating circuit is released to the outside through the motor cooling circuit, avoiding thermal protection shutdown of the fuel heater. For different battery heating power requirements and different cab heating power requirements, only the fuel heater with the corresponding power needs need to be selected with reference to the maximum heating demand of the system. The rest is controlled and adjusted by the system. It has good compatibility and is suitable for medium and heavy trucks with high battery heating power requirements.

[0036] 2. This application addresses the common need for users in cold regions to preheat the battery and cab, and provides a method for remotely preheating the battery and cab without requiring the entire vehicle to be connected to high-voltage electricity, thus improving the overall vehicle safety.

[0037] 3. The system in this application also takes into account the summer battery cooling and cab cooling needs, making it a comprehensive system. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of an electric vehicle thermal management system suitable for high-altitude and cold regions provided in an embodiment of the present invention;

[0039] Figure 2 This is a system function interface diagram of an electric vehicle thermal management system suitable for high-altitude and cold regions provided in an embodiment of the present invention;

[0040] Figure 3 This is a flowchart illustrating the method for remotely preheating the battery and cab provided in an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0042] 1-Electric refrigeration compressor; 2-Refrigerant temperature sensor; 3-Condenser; 4-Refrigerant pressure sensor; 5-Refrigerant shut-off valve; 6-Thermal expansion valve; 7-Evaporator; 8-Evaporator temperature sensor; 9-Electronic expansion valve; 10-Second heat exchanger; 11-Refrigerant temperature and pressure sensor; 12-Fuel heater; 13-Fuel heater body temperature sensor; 14-First water pump; 15-First three-way reversing valve; 16-First heat exchanger; 17-Fuel heater outlet temperature sensor; 8-Battery inlet water temperature sensor; 19-Battery pack water-cooling plate; 20-Second water pump; 21-First three-way proportional valve; 22-Heater core; 23-Driver's cab interior temperature sensor; 24-Blower; 25-Second three-way proportional valve; 26-Two-way proportional valve; 27-First check valve; 28-Second check valve; 29-Radiator; 30-Electric fan; 31-Radiator outlet temperature sensor; 32-Third water pump; 33-Multi-function controller heating element; 34-Motor heating element; Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0045] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0046] It should be understood that although the terms first, second, third, etc., may be used in the embodiments of this application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, first may also be referred to as second without departing from the scope of the embodiments of this application, and similarly, second may also be referred to as first.

[0047] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0048] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0049] It should be noted that any symbols and / or numbers present in the specification that are not marked in the accompanying drawings are not reference numerals.

[0050] Example 1

[0051] See Figure 1 As shown in the figure, an embodiment of the present invention provides a thermal management system for electric vehicles suitable for high-altitude and cold regions, comprising:

[0052] The heating circuit includes a fuel heater 12.

[0053] The battery thermal management circuit includes a first heat exchanger 16 and a second heat exchanger 10. The battery pack water-cooled plate 19 can be selectively connected to the first heat exchanger 16 or the second heat exchanger 10. The first heat exchanger 16 can be selectively connected to the warm air heating circuit, and the second heat exchanger 10 can be selectively connected to the cooling circuit.

[0054] The motor cooling circuit includes a radiator 29 and can be optionally connected to a warm air heating circuit.

[0055] This application uses only one fuel heater to achieve stable heating of the battery and cab, reducing the overall vehicle cost and layout difficulty. Excess heat in the heating circuit is released to the outside through the motor cooling circuit, avoiding thermal protection shutdown of the fuel heater. For different battery heating power requirements and different cab heating power requirements, only the corresponding fuel heater power needs to be selected with reference to the maximum heating requirement of the system. The rest is controlled and adjusted by the system. It has good compatibility and is suitable for medium and heavy trucks with high battery heating power requirements.

[0056] See Figure 1 As shown, the battery thermal management circuit also includes a first three-way reversing valve 15, and the battery pack water cooling plate 19 can be selectively connected to the first heat exchanger 16 or the second heat exchanger 10 through the first three-way reversing valve 15.

[0057] The warm air heating circuit also includes a first three-way proportional valve 21, and the first heat exchanger 16 can be selectively connected to the warm air heating circuit through the first three-way proportional valve 21.

[0058] The motor cooling circuit also includes a second three-way proportional valve 25, which can be selectively connected to the warm air heating circuit via the second three-way proportional valve 25; a two-way proportional valve 26 is connected between the warm air heating circuit and the second three-way proportional valve 25.

[0059] The refrigeration circuit also includes an electronic expansion valve 9, and the second heat exchanger 10 can be selectively connected to the refrigeration circuit via the electronic expansion valve 9. The refrigeration circuit is existing technology, and its internal structure will not be described in detail.

[0060] See Figure 1 As shown, the warm air heating circuit also includes a warm air core 22, which is connected in parallel with the first heat exchanger 16. The first three-way proportional valve 21 can be selectively connected to the warm air core 22 or to the first heat exchanger 16.

[0061] The motor cooling circuit also includes a multi-function controller heating element 33 and a motor heating element 34. The multi-function controller heating element 33 and the motor heating element 34 are connected in parallel with the warm air heating circuit. The second three-way proportional valve 25 can be selectively connected to the multi-function controller heating element 33 and the motor heating element 34 or to the warm air heating circuit.

[0062] See Figure 1 As shown, the warm air heating circuit also includes a fuel heater body temperature sensor 13 and a fuel heater outlet temperature sensor 17. The fuel heater body temperature sensor 13 is used to detect the temperature of the fuel heater body 16, and the fuel heater outlet temperature sensor 17 is used to detect the temperature of the liquid medium flowing through the fuel heater outlet.

[0063] The battery thermal management circuit also includes a battery inlet temperature sensor 18, used to detect the temperature of the liquid medium flowing through the battery thermal management circuit;

[0064] The motor cooling circuit also includes a radiator outlet temperature sensor 31, used to detect the temperature of the liquid medium flowing through the motor cooling circuit.

[0065] See Figure 1 As shown, the battery thermal management circuit also includes a first water pump 14, which serves as the power source for circulating the liquid medium in the battery thermal management circuit.

[0066] The warm air heating circuit also includes a second water pump 20, which serves as the power source for the circulation of the liquid medium in the warm air heating circuit;

[0067] The motor cooling circuit also includes a third water pump 32, which serves as the power source for circulating the liquid medium in the motor cooling circuit.

[0068] Example 2

[0069] This application provides a control method for an electric vehicle thermal management system suitable for high-altitude and cold regions. The control method includes:

[0070] After receiving the cab heating command and the target temperature of the liquid medium in the heating circuit, the fuel heater 12 is started. The heating circuit is connected to the heating core 22 through the first three-way proportional valve 21 for cab heating. The operating power of the fuel heater 12 is adjusted according to the outlet temperature of the fuel heater.

[0071] When the temperature of the fuel heater body reaches the first preset value, the motor heat dissipation circuit is connected to the warm air heating circuit through the second three-way proportional valve 25 to dissipate heat to the battery thermal management circuit, and the opening of the two-way proportional valve 26 is adjusted according to the temperature of the fuel heater body.

[0072] After entering the cab heating mode, the fuel heater body generates a large amount of heat. The second three-way proportional valve 25 is set to the IG port fully open and the H port closed. The motor heat dissipation circuit is connected to the warm air heating circuit, and the two-way proportional valve 26 is opened. The opening degree is controlled according to the fuel heater body temperature feedback from the fuel heater body temperature sensor 13, so that some heat is dissipated through the radiator 29 to ensure that the fuel heater 12 stops due to lack of heat protection.

[0073] When the temperature of the multi-function controller heating element 33 or the motor heating element 34 reaches the second preset value and the temperature of the fuel heater body reaches the first preset value, the motor heat dissipation circuit is simultaneously connected to the multi-function controller heating element 33, the motor heating element 34 and the warm air heating circuit through the second three-way proportional valve 25.

[0074] When the multi-function controller heating component 33 or the motor heating component 34 in the motor cooling circuit, as well as the fuel heater body, all need to dissipate heat, the second three-way proportional valve 25 can be set to the state where both the IG and HG ports are open.

[0075] Upon receiving the battery heating command and the target temperature of the liquid medium in the battery thermal management circuit, the battery pack water cooling plate 19 is connected to the first heat exchanger 16 through the first three-way reversing valve 15, and the battery thermal management circuit is connected to the warm air heating circuit through the first three-way proportional valve 21. The fuel heater 12 is then started to heat the battery thermal management circuit.

[0076] Adjust the operating power of the fuel heater 12 according to the battery inlet temperature.

[0077] When only the battery needs heating, the first three-way reversing valve 15 is switched to the AC port open and the B port closed, and the first three-way proportional valve 21 is set to the DE port fully open and the F port closed. The fuel heater 12 is started and runs at the preset initial power. The operating power is controlled in a closed loop according to the battery inlet water temperature feedback from the battery inlet water temperature sensor 18 to ensure that the battery inlet water temperature is within the range of the battery requested water temperature Tbat ± 3℃.

[0078] Upon receiving the battery heating command and the target temperature of the liquid medium in the battery thermal management circuit, the cab heating command and the target temperature of the liquid medium in the warm air heating circuit, the system controls the first three-way reversing valve 15 to connect the battery pack water-cooled plate 19 to the first heat exchanger 16, and controls the first three-way proportional valve 21 to connect the warm air heating circuit to both the warm air core 22 and the first heat exchanger 16 simultaneously; this is used to simultaneously heat the cab and the battery.

[0079] Adjust the opening degree 21 of the first three-way proportional valve to control the heating temperature of the cab, and adjust the power of the fuel heater 12 according to the battery inlet water temperature.

[0080] When the battery needs heating and the cab needs heating, the first three-way reversing valve 15 is switched to the AC port open and the B port closed, and the first three-way proportional valve 21 is set to the DE and DF ports open. The fuel heater 12 is started and runs at a preset high power. The target water temperature in the cab is controlled by adjusting the opening degree of the first three-way proportional valve 21. The power of the fuel heater 12 is controlled in a closed loop according to the battery inlet water temperature feedback from the battery inlet water temperature sensor 18, so as to take into account both cab heating and battery heating.

[0081] Example 3

[0082] This invention provides a specific structure of a thermal management system, its corresponding operating mode, and remote control process:

[0083] I. Thermal Management System

[0084] 1. The refrigeration system includes an electric refrigeration compressor 1 connected via refrigerant piping, a refrigerant temperature sensor 2, a condenser 3, a refrigerant pressure sensor 4, a refrigerant shut-off valve 5, a thermostatic expansion valve 6, an evaporator 7, an evaporator temperature sensor 8, an electronic expansion valve 9, a second heat exchanger 10, and a refrigerant temperature and pressure sensor 11.

[0085] 2. The battery heating system includes a fuel heater 12 connected via a coolant pipeline, a fuel heater body temperature sensor 13, a first water pump 14, a first three-way reversing valve 15, a first heat exchanger 16, a fuel heater outlet temperature sensor 17, a battery inlet temperature sensor 18, and a battery pack water cooling plate 19.

[0086] 3. The heating system includes a second water pump 20, a first three-way proportional valve 21, a heater core 22, an interior temperature sensor 23, a blower 24, a second three-way proportional valve 25, a two-way proportional valve 26, a first check valve 27, and a second check valve 28, all connected via coolant pipes.

[0087] 4. The motor cooling system includes a radiator 29, an electric fan 30, a radiator outlet temperature sensor 31, a third water pump 32, a multi-function controller heating element 33, and a motor heating element 34, all connected by coolant pipes.

[0088] 5. The control system includes essential components such as a thermal management controller, air conditioning controller, battery management system, all-in-one controller, motor controller, and gateway controller, as well as optional remote control APP client, remote information processing control unit (TBOX), and vehicle controller (VCU). See [link to relevant documentation]. Figure 3 As shown.

[0089] II. Working Mode

[0090] Mode 1 Single Cab Cooling

[0091] After receiving the user's cooling intention, the air conditioning controller controls the blower 24 to start and sends the cab cooling request and target evaporator temperature to the thermal management controller. The thermal management controller controls the refrigerant shut-off valve 5 to open, the electronic expansion valve 9 to close, and the electric refrigeration compressor 1 to start. The speed is calculated based on the preset feedforward amount and the difference between the feedback value of the evaporator surface temperature sensor 8 and the target evaporator surface temperature. The speed of the electric fan 30 is controlled based on the feedback value of the refrigerant pressure sensor 4. At the same time, the speed of the electric fan 30 is increased or the speed of the electric refrigeration compressor 1 is decreased based on the feedback value of the refrigerant temperature sensor 2, so as to protect the electric refrigeration compressor 1 and prevent irreversible failure.

[0092] Mode 2 Single Battery Cooling Mode

[0093] When the thermal management controller receives a battery cooling request from the battery management system, it controls the first three-way reversing valve 15 to switch the AB port to be open and the C port to be closed, starts the first water pump 14 and runs it at the set speed, closes the refrigerant shut-off valve 5, opens the electronic expansion valve 9 to the preset opening degree, starts the electric refrigeration compressor 1, and calculates the speed based on the preset feedforward amount and the difference between the feedback value of the battery inlet water temperature sensor 18 and the target battery inlet water temperature. The opening degree of the electronic expansion valve 9 is controlled based on the superheat calculated from the temperature and pressure values ​​collected by the refrigerant temperature and pressure sensor 11 at the outlet of the second heat exchanger, so as to ensure that the system superheat is within the normal range, such as 5℃-8℃.

[0094] Mode 3: Battery cooling + cab cooling mode

[0095] Based on the single-battery cooling mode, the air conditioning controller controls the blower 24 to start, the thermal management controller controls the refrigerant shut-off valve 5 to open, and the electric refrigeration compressor 1 comprehensively considers the target evaporator surface temperature and the target battery inlet water temperature to simultaneously meet the cooling needs of the battery and the cab.

[0096] Mode 4 Battery Self-Circulation Mode

[0097] After receiving the battery self-circulation mode request sent by the battery management system, the thermal management controller controls the first three-way reversing valve 15 to switch the AB port to conduction and the C port to non-conduction state, turns on the first water pump 14 and runs it at the set speed, and the cooling system and fuel heater 12 are not started, so as to achieve the effect of uniform temperature inside the battery.

[0098] Mode 5 Single-drive cooling mode

[0099] After the thermal management controller receives a signal from the multi-function controller heating component 33 or the motor controller indicating that the temperature of the motor heating component 34 has reached a preset value, it controls the third water pump 32 to start and run at a preset low speed. Then, the speed of the third water pump 32 is obtained by looking up a table based on the feedback value of the radiator outlet temperature sensor 31 and the temperature of the heating component body. After the speed of the third water pump 32 increases to the maximum value, the electric fan 30 starts to remove the heat of the coolant flowing through the radiator. The speed of the electric fan 30 is controlled according to the radiator outlet temperature sensor 31 to ensure that the inlet water temperature of the multi-function controller heating component 33 is less than the set value, such as 60°C.

[0100] Mode 6 Single Battery Heating Mode

[0101] After receiving the battery heating request and target water temperature Tbat from the battery thermal management system, the thermal management controller controls the first three-way reversing valve 15 to switch the AC port to open and the B port to closed, starts the first water pump 14 and runs it at the set speed, controls the first three-way proportional valve 21 to be fully open at the DE port and closed at the F port, then controls the second water pump 20 to work, starts the fuel heater 12 and runs it at the preset initial power. The operating power is controlled in a closed loop according to the feedback value of the battery inlet water temperature sensor 18 to ensure that the battery inlet water temperature is within the range of the battery requested water temperature Tbat ±3℃.

[0102] Mode 7 Single Cab Heating Mode

[0103] After receiving the user's heating intention, the air conditioning controller controls the blower 24 to start and sends the cab heating request and target water temperature Tcab to the thermal management controller. The thermal management controller controls the first three-way proportional valve 21 to be fully open at port EF and closed at port D. Then, it controls the second water pump 20 to work. The fuel heater 12 starts and runs at the preset initial power. The power of the fuel heater 12 is controlled in a closed loop according to the feedback value of the fuel heater outlet temperature sensor 17 to ensure that it is within the range of target water temperature Tcab ± 3℃.

[0104] Mode 8: Battery heating + cab heating mode

[0105] After receiving the battery heating request and target water temperature Tbat from the battery thermal management system, and the cab heating request and target water temperature Tcab from the air conditioning controller, the thermal management controller controls the first three-way reversing valve 15 to switch the AC port to be open and the B port to be closed. It also controls the first three-way proportional valve 21 to be open at both the DE and DF ports. The opening of the DE and DF ports is calibrated according to the preset values. Then, it controls the second water pump 20 to work at the preset speed. The fuel heater 12 starts and runs at the preset high power. The target water temperature in the cab is controlled by adjusting the opening of the first three-way proportional valve 21. The power of the fuel heater 12 is controlled in a closed loop according to the feedback value of the battery inlet temperature sensor 18, so as to take into account both cab heating and battery heating.

[0106] Mode 9: Fuel heater anti-shutdown cooling mode

[0107] This mode can be entered based on mode 7. When the thermal management controller detects that the feedback value of the fuel heater body temperature sensor 13 reaches the preset value (lower than the thermal protection temperature of the fuel heater 12, which can be calibrated), it controls the second three-way proportional valve 25 to be in the state of full opening of the IG port and closed of the H port. The two-way proportional valve 26 is opened, and the opening degree is controlled according to the feedback value of the fuel heater body temperature sensor 13, so that some heat is dissipated through the radiator to ensure that the fuel heater 12 does not shut down due to thermal protection. In this mode, the electric fan 30 can be turned on as needed to improve the heat dissipation effect. This mode is compatible with the single electric drive heat dissipation mode of mode 5. The second three-way proportional valve 25 can be set to the state of both IG and HG ports being open.

[0108] Remote control process:

[0109] Solution for remotely preheating the battery and cab:

[0110] See Figure 2As shown, the user sends a vehicle wake-up signal via the vehicle's mobile app. This signal, transmitted through the vehicle's remote information processing controller and gateway controller, wakes up the vehicle controller, battery management system, and thermal management controller. Based on the current cell temperature fed back by the battery management system and the cabin temperature fed back by the air conditioning controller, the system determines whether preheating is needed. If preheating is required, the user sets a target cell temperature or cabin temperature via the app. The battery management system then sends a battery heating request and a target coolant temperature (Tbat) based on the set target cell temperature. Upon receiving the request, the thermal management controller operates according to mode 6. Heating stops when the cell temperature reaches the target temperature and restarts when the cell temperature drops below 3°C below the target temperature. The heating system is designed to maintain the battery cell temperature near the target temperature and prevent frequent start-stop cycles. The air conditioning controller sends a heating request to the cab based on the set target temperature. Upon receiving the request, the thermal management controller enters mode 7. When the feedback value from the cab interior temperature sensor 23 reaches the target temperature, the fuel heater 12 continues to operate, keeping the cab temperature near the target temperature. Based on the feedback value from the fuel heater body temperature sensor 13, the controller selects whether to enter mode 9, while preventing the fuel heater 12 from shutting down due to thermal protection. If both the cab and the battery have heating requests simultaneously, the system enters mode 8. During this process, the user can view the current battery cell temperature and cab temperature in real time via the APP and can choose to turn off the heating at any time.

[0111] Example 4

[0112] This embodiment provides an electronic device. Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. See also: Figure 4 The electronic device 1000 includes a processor 1001 and a memory 1002. The memory 1002 stores computer-readable instructions. When the computer-readable instructions are executed by the processor 1001, the steps in any of the control methods for the electric vehicle thermal management system suitable for high-altitude and cold regions described above are performed. Through the above technical solution, the processor 1001 and the memory 1002 are interconnected and communicate with each other via a communication bus and / or other forms of connection mechanisms (not shown). The memory 1002 stores a processor-executable computer program. When the electronic device 1000 is running, the processor 1001 executes the computer program to perform the control method for the electric vehicle thermal management system suitable for high-altitude and cold regions in any of the optional implementations of the above embodiments.

[0113] Example 5

[0114] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a control method for an electric vehicle thermal management system suitable for high-altitude and cold regions, as provided in all embodiments of this application.

[0115] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0116] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of transmitting, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0117] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0118] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, and C++—as well as conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric vehicle thermal management system suitable for high cold regions, characterized by, The system comprises: a warm air heating circuit comprising a fuel heater (12); a battery thermal management circuit comprising a first heat exchanger (16), a second heat exchanger (10), a battery pack water cooling plate (19) being selectively connected with the first heat exchanger (16) or the second heat exchanger (10), the first heat exchanger (16) being selectively connected with the warm air heating circuit, and the second heat exchanger (10) being selectively connected with a refrigeration circuit; a motor heat dissipation circuit comprising a radiator (29), the motor heat dissipation circuit being selectively connected with the warm air heating circuit.

2. The electric vehicle thermal management system suitable for high-cold regions according to claim 1, wherein: the battery thermal management circuit further comprises a first three-way directional valve (15), the battery pack water cooling plate (19) being selectively connected with the first heat exchanger (16) or the second heat exchanger (10) through the first three-way directional valve (15); the warm air heating circuit further comprises a first three-way proportional valve (21), the first heat exchanger (16) being selectively connected with the warm air heating circuit through the first three-way proportional valve (21); the motor heat dissipation circuit further comprises a second three-way proportional valve (25), the motor heat dissipation circuit being selectively connected with the warm air heating circuit through the second three-way proportional valve (25), and a two-way proportional valve (26) being connected between the warm air heating circuit and the second three-way proportional valve (25); the refrigeration circuit further comprises an electronic expansion valve (9), the second heat exchanger (10) being selectively connected with the refrigeration circuit through the electronic expansion valve (9).

3. The electric vehicle thermal management system suitable for high-cold regions according to claim 2, wherein: the warm air heating circuit further comprises a warm air core (22), the warm air core (22) being connected in parallel with the first heat exchanger (16), and the first three-way proportional valve (21) being selectively connected with the warm air core (22) or the first heat exchanger (16); the motor heat dissipation circuit further comprises a multi-in-one controller heat generating component (33) and a motor heat generating component (34), the multi-in-one controller heat generating component (33) and the motor heat generating component (34) being connected in parallel with the warm air heating circuit, and the second three-way proportional valve (25) being selectively connected with the multi-in-one controller heat generating component (33) and the motor heat generating component (34) or the warm air heating circuit.

4. The electric vehicle thermal management system suitable for high-cold regions according to claim 1, wherein: the warm air heating circuit further comprises a fuel heater body temperature sensor (13) and a fuel heater water outlet temperature sensor (17), the fuel heater body temperature sensor (13) being used for detecting the temperature of the fuel heater body, and the fuel heater water outlet temperature sensor (17) being used for detecting the temperature of the liquid medium flowing through the fuel heater water outlet. The battery thermal management circuit further comprises a battery water inlet temperature sensor (18) for detecting the temperature of the liquid medium flowing through the battery thermal management circuit. The motor heat dissipation circuit further comprises a radiator outlet temperature sensor (31) for detecting the temperature of the liquid medium flowing through the motor heat dissipation circuit.

5. The electric vehicle thermal management system suitable for high-cold regions according to claim 1, wherein, The battery thermal management circuit further comprises a first water pump (14) for providing circulation power for the liquid medium in the battery thermal management circuit. The warm air heating circuit further comprises a second water pump (20) for providing circulation power for the liquid medium in the warm air heating circuit. The motor heat dissipation circuit further comprises a third water pump (32) for providing circulation power for the liquid medium in the motor heat dissipation circuit.

6. A control method of an electric vehicle thermal management system suitable for high-cold regions, characterized by, The control method for the electric vehicle thermal management system suitable for high-cold regions according to any one of claims 1-5, wherein, After receiving the cabin heating instruction and the target temperature of the liquid medium in the warm air heating circuit, the fuel heater (12) is started, the warm air heating circuit is connected to the warm air core (22) through the first three-way proportional valve (21), and the cabin is heated, and the operating power of the fuel heater (12) is adjusted according to the outlet temperature of the fuel heater. When the temperature of the fuel heater body reaches a first preset value, the motor heat dissipation circuit is connected to the warm air heating circuit through the second three-way proportional valve (25), and the battery thermal management circuit is cooled, and the opening degree of the two-way proportional valve (26) is adjusted according to the temperature of the fuel heater body.

7. The control method for the electric vehicle thermal management system suitable for high-cold regions according to claim 6, wherein, When the temperature of the multi-in-one controller heating component (33) or the motor heating component (34) reaches a second preset value and when the temperature of the fuel heater body reaches a first preset value, the motor heat dissipation circuit is connected to the multi-in-one controller heating component (33) and the motor heating component (34) and the warm air heating circuit through the second three-way proportional valve (25).

8. The control method for the electric vehicle thermal management system suitable for high-cold regions according to claim 6, wherein, After receiving the battery heating instruction and the target temperature of the liquid medium in the battery thermal management circuit, the battery pack water cooling plate (19) is connected to the first heat exchanger (16) through the first three-way reversing valve (15), the battery thermal management circuit is connected to the warm air heating circuit through the first three-way proportional valve (21), and the fuel heater (12) is started to heat the battery thermal management circuit. The operating power of the fuel heater (12) is adjusted according to the temperature of the battery water inlet.

9. The control method for the electric vehicle thermal management system suitable for high-cold regions according to claim 6, wherein, After receiving the battery heating instruction, the target temperature of the liquid medium in the battery thermal management loop, the cabin heating instruction and the target temperature of the liquid medium in the warm air heating loop, the first three-way reversing valve (15) is controlled to connect the battery pack water cooling plate (19) with the first heat exchanger (16), and the first three-way proportional valve (21) is controlled to connect the warm air heating loop with the warm air core (22) and the first heat exchanger (16) at the same time, so as to simultaneously perform cabin heating and battery heating. The first three-way proportional valve opening (21) is adjusted to control the cabin heating temperature, and the fuel heater (12) power is adjusted according to the battery water inlet temperature.

10. An electronic device comprising a memory and a processor, said memory storing a computer program operable on said processor, characterized in that, The processor implements the steps in the control method of the electric vehicle thermal management system suitable for high-cold regions in any one of claims 6 to 9 when executing the program.

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