Thermal management dual cooling control method, system and vehicle for electric vehicle

Abstract

The present application relates to a thermal management dual refrigeration control method, system and automobile for electric vehicles, which includes: adjusting the opening of the electronic expansion valve according to the current state of the vehicle to meet the cooling demand of the power battery; judging whether the temperature TAC of the evaporator is in the temperature range t1-t2 that meets the cooling demand of the passenger compartment, and if so, making further adjustments according to the actual water inlet temperature of the power battery, otherwise continuing to adjust the opening of the electronic expansion valve or the speed of the compressor until the temperature TAC of the evaporator is in the temperature range t1-t2. By adopting different control strategies in the dual refrigeration working mode and presetting different electronic expansion valve opening values ​​for different vehicle states, the cooling requirements of the passenger compartment and the power battery under different working conditions can be met at the same time, the cooling of the passenger compartment is given priority when driving, and while ensuring the cooling effect of the passenger compartment during charging, more cooling capacity is allocated to the power battery as much as possible, so as to better suppress the battery temperature rise caused by high current charging.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicles, and in particular to a thermal management dual-refrigeration control method and system for electric vehicles, and a vehicle. Background Art

[0002] At present, electric vehicles are developing rapidly in my country, with production and sales increasing significantly. In order to improve the driving experience and power battery life, more and more new energy vehicle thermal management systems are configuring liquid cooling modules for power batteries. Figure 1 The thermal management system block diagram is a relatively common low-cost integrated thermal management system, where the electric compressor provides cooling capacity uniformly. The air conditioning system and battery system refrigeration circuits are designed in parallel. The air conditioning system refrigeration circuit is designed with a refrigerant valve, electromagnetic expansion valve, and evaporator. The battery refrigeration circuit is designed with an electronic expansion valve and chiller (heat exchanger), and a temperature and pressure sensor. The system heat is uniformly dissipated by the front-end heat dissipation module. When both the passenger compartment and the power battery require cooling, a dual cooling working mode appears. How to reasonably allocate the cooling power of the two circuits has become a research focus.

[0003] In the related technology, in the common dual cooling mode of the thermal management system, the same cooling power allocation strategy is used for driving and charging. However, the initial charging stage is often high-current charging, which requires a large amount of cooling capacity. Therefore, the cooling power required by the power battery in the charging condition is much greater than the cooling power required in driving. The cooling power allocated to the battery end by the thermal management system is relatively small, resulting in the inability to effectively suppress the temperature rise of the battery charging, causing the battery temperature to rise faster during charging, the charging time to be longer, and the battery life to decay faster. Summary of the invention

[0004] The present application provides a thermal management dual cooling control method, system and vehicle for electric vehicles, which can solve the problem in the related art that during the charging condition, the cooling power allocated to the battery end by the thermal management system is small, resulting in the inability to effectively suppress the temperature rise of the battery charging, causing the battery temperature to rise faster during charging, the charging time to be prolonged, and the battery life to decay faster.

[0005] In a first aspect, the present application provides a thermal management dual cooling control method for electric vehicles, which includes: adjusting the opening of the electronic expansion valve according to the current state of the vehicle to meet the cooling demand of the power battery; determining the temperature T of the evaporator AC Is it within the temperature range t1-t2 that meets the cooling demand of the passenger compartment? If so, further adjustment is made according to the actual water inlet temperature of the power battery. Otherwise, the opening of the electronic expansion valve or the speed of the compressor is continuously adjusted until the temperature T of the evaporator reaches t1. AC It is within the temperature range t1 to t2.

[0006] In combination with the first aspect, in one embodiment, the further adjustment based on the actual water inlet temperature of the power battery includes: determining whether the actual water inlet temperature of the power battery is less than or equal to the target water inlet temperature, and if so, reducing the speed of the compressor, otherwise further adjusting the opening of the electronic expansion valve or the speed of the compressor.

[0007] In combination with the first aspect, in one embodiment, further adjusting the opening of the electronic expansion valve or the speed of the compressor includes: determining whether the current opening of the electronic expansion valve is the maximum opening P that meets the cooling demand of the power battery. max If yes, the speed of the compressor is further adjusted, otherwise the opening of the electronic expansion valve is increased.

[0008] In combination with the first aspect, in one implementation, further adjusting the rotation speed of the compressor includes: determining whether the rotation speed of the compressor is a maximum rotation speed, if so, maintaining the maximum rotation speed, otherwise increasing the rotation speed.

[0009] In combination with the first aspect, in one embodiment, the opening of the electronic expansion valve or the speed of the compressor is continuously adjusted until the temperature T of the evaporator reaches AC In the temperature range t1 to t2, including: if T AC <t1, it is determined whether the current opening of the electronic expansion valve is the maximum opening P that meets the cooling demand of the power battery. max If yes, the speed of the compressor is further adjusted, otherwise the opening of the electronic expansion valve is increased.

[0010] In combination with the first aspect, in one embodiment, the opening of the electronic expansion valve or the speed of the compressor is continuously adjusted until the temperature T of the evaporator reaches AC In the temperature range t1 to t2, it also includes: if T AC ≥t2, it is determined whether the speed of the compressor is the maximum speed, and if so, the opening of the electronic expansion valve is further adjusted, otherwise the speed is increased.

[0011] In combination with the first aspect, in one embodiment, further adjusting the opening of the electronic expansion valve includes: determining whether the current opening of the electronic expansion valve is the minimum opening P that meets the cooling demand of the power battery. min If so, maintain the maximum speed of the compressor, otherwise reduce the opening of the electronic expansion valve.

[0012] In combination with the first aspect, in one embodiment, adjusting the opening of the electronic expansion valve according to the current state of the vehicle to meet the cooling demand of the power battery includes: if the vehicle is currently in a driving state, adjusting the opening of the electronic expansion valve to a minimum opening P that meets the cooling power demand of the power battery. minIf it is in the charging state, the opening of the electronic expansion valve is adjusted to a preset value according to the current ambient temperature so that the opening of the electronic expansion valve meets the cooling power requirement of the power battery.

[0013] In the second aspect, an embodiment of the present application provides a thermal management dual refrigeration control system for an electric vehicle, comprising: a judgment module, which is used to judge whether the temperature TAC of the evaporator is within the temperature range t1 to t2 that meets the cooling demand of the passenger compartment; a control module, which is used to adjust the opening of the electronic expansion valve according to the current state of the vehicle so as to meet the cooling demand of the power battery, and when the temperature TAC of the evaporator is within the temperature range t1 to t2, further adjustment is made according to the actual water inlet temperature of the power battery, and when it is not within the temperature range t1 to t2, the opening of the electronic expansion valve is continued to be adjusted until the temperature TAC of the evaporator is within the temperature range t1 to t2.

[0014] In a second aspect, an embodiment of the present application provides a vehicle, which includes the above-mentioned thermal management dual refrigeration control system for electric vehicles.

[0015] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0016] By adopting different control strategies in the dual cooling working mode and presetting different electronic expansion valve opening values ​​for different vehicle states, the cooling needs of the passenger compartment and the power battery under different working conditions can be met at the same time. The cooling of the passenger compartment is given priority when driving. When charging, while ensuring the cooling effect of the passenger compartment, more cooling capacity is allocated to the power battery as much as possible, thereby better suppressing the battery temperature rise caused by high-current charging, shortening the charging time, and extending the battery. It is simple and reliable, easy to implement, and low-cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a block diagram of a thermal management system in the related art;

[0019] Figure 2 A flow chart of a thermal management dual cooling control method for electric vehicles provided by an embodiment of the present invention;

[0020] Figure 3 A flow chart of a dual cooling mode control method provided by an embodiment of the present invention;

[0021] Figure 4A flowchart for starting the refrigeration mode of an electric vehicle provided in an embodiment of the present invention.

[0022] In the figure:

[0023] 1. Electronic expansion valve; 2. Power battery; 3. Evaporator; 4. Passenger compartment; 5. Compressor; 6. Condenser; 7. Refrigerant valve; 8. Solenoid expansion valve; 9. Heat exchanger; 10. Electronic water pump; 11. Water outlet temperature sensor; 12. Water inlet temperature sensor; 13. Kettle; 14. Temperature and pressure sensor. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] The embodiments of the present application provide a thermal management dual cooling control method, system and vehicle for electric vehicles, which can solve the problem in the related art that during the charging condition, the cooling power allocated to the battery end by the thermal management system is small, resulting in the inability to effectively suppress the temperature rise of the battery charging, causing the battery temperature to rise faster during charging, prolonging the charging time, and accelerating the attenuation of the battery life.

[0026] See also Figure 1 As shown, it is an integrated thermal management system that is relatively common in the relevant technology. The compressor 5 provides cooling capacity uniformly. The refrigeration circuits of the air-conditioning system and the battery system adopt a parallel integrated design. The refrigeration circuit of the air-conditioning system is designed with a refrigerant valve 7 and an electromagnetic expansion valve 8 (the opening cannot be adjusted), and an evaporator 3. The battery refrigeration circuit is designed with an electronic expansion valve 1 (the opening can be adjusted) and a chiller (heat exchanger 9), and a temperature and pressure sensor 14. The heat dissipation of the system is uniformly dissipated by the front-end heat dissipation module.

[0027] Figure 2 The present invention provides a thermal management dual cooling control method for electric vehicles, which may include: adjusting the opening of the electronic expansion valve 1 according to the current state of the vehicle to meet the cooling demand of the power battery 2; determining the temperature T of the evaporator 3 AC Whether it is within the temperature range t1-t2 that meets the cooling demand of the passenger compartment 4, if so, further adjustment is made according to the actual water inlet temperature of the power battery 2, otherwise, the opening of the electronic expansion valve 1 or the speed of the compressor 5 is continued to be adjusted until the temperature T of the evaporator 3 reaches ACIn the temperature range t1 to t2. In this embodiment, by adopting different control strategies in the dual cooling working mode and presetting different electronic expansion valve 1 opening values ​​for different vehicle states, the cooling requirements of the passenger compartment and the power battery under different working conditions can be met at the same time. The cooling of the passenger compartment is given priority during driving. When charging, while ensuring the cooling effect of the passenger compartment, more cooling capacity is allocated to the power battery as much as possible, thereby better suppressing the battery temperature rise caused by high current charging, shortening the charging time, and extending the battery life. It is simple, reliable, easy to implement, and low cost.

[0028] See also Figure 3 As shown, in some embodiments, the further adjustment according to the actual water inlet temperature of the power battery 2 may include: determining whether the actual water inlet temperature of the power battery 2 is less than or equal to the target water inlet temperature, if so, reducing the speed of the compressor 5, otherwise further adjusting the opening of the electronic expansion valve 1 or the speed of the compressor 5. In this embodiment, the temperature T AC When the temperature is within the range t1 to t2 that meets the cooling demand of the passenger compartment 4, it means that the cooling demand of the passenger compartment 4 is met. By comparing the actual water inlet temperature of the power battery 2 with the target value, if it is less than the target value, it means that the cooling demand of the power battery 2 is met, then the rotation speed of the compressor 5 is reduced, thereby reducing the cooling capacity and reducing energy consumption. If it is greater than the target value, it means that the cooling demand of the power battery 2 is not met, then further adjustments are made to meet the cooling demand of the power battery 2.

[0029] See also Figure 3 As shown, in some embodiments, further adjusting the opening of the electronic expansion valve 1 or the speed of the compressor 5 may include: determining whether the current opening of the electronic expansion valve 1 is the maximum opening P that meets the cooling demand of the power battery 2. max If yes, the speed of the compressor 5 is further adjusted, otherwise the opening of the electronic expansion valve 1 is increased. In this embodiment, when the actual water inlet temperature of the power battery 2 is greater than or equal to the target water inlet temperature, it means that the cooling demand of the power battery 2 is not met. By comparing the current opening of the electronic expansion valve 1 with the maximum opening P that meets the cooling demand of the power battery 2, the cooling demand of the power battery 2 is not met. max , less than the maximum opening P max Adjust to the maximum opening P max It satisfies the cooling demand of power battery 2, which is equal to the maximum opening P max The rotation speed of the compressor 5 is adjusted to meet the cooling demand of the power battery 2 .

[0030] See also Figure 3As shown, in some embodiments, further adjusting the speed of the compressor 5 may include: determining whether the speed of the compressor 5 is the maximum speed, if so, maintaining the maximum speed, otherwise increasing the speed. In this embodiment, when the electronic expansion valve 1 has been adjusted to the maximum opening P max When the rotation speed of the compressor 5 is adjusted to the maximum rotation speed, more cooling capacity can be allocated to the power battery as much as possible.

[0031] See also Figure 3 As shown, in some embodiments, the opening of the electronic expansion valve 1 or the speed of the compressor 5 is continuously adjusted until the temperature T of the evaporator 3 reaches AC The temperature range t1 to t2 may include: AC <t1, it is determined whether the current opening of the electronic expansion valve 1 is the maximum opening P that meets the cooling demand of the power battery 2. max If so, the speed of the compressor 5 is further adjusted, otherwise the opening of the electronic expansion valve 1 is increased. In this embodiment, when the temperature T of the evaporator 3 AC When it is less than t1, it means that the cooling demand of the passenger compartment 4 is met and there is a surplus. By comparing the current opening of the electronic expansion valve 1 with the maximum opening P that meets the cooling demand of the power battery 2 max , less than the maximum opening P max Adjust to the maximum opening P max , so as to ensure the cooling effect of the passenger compartment while allocating more cooling capacity to the power battery as much as possible, which is equal to the maximum opening P max The rotation speed of the compressor 5 is reduced, thereby reducing the refrigeration capacity and reducing energy consumption.

[0032] See also Figure 3 As shown, in some embodiments, the opening of the electronic expansion valve 1 or the speed of the compressor 5 is continuously adjusted until the temperature T of the evaporator 3 reaches AC In the temperature range t1-t2, it can also include: if T AC ≥t2, it is determined whether the speed of the compressor 5 is the maximum speed. If so, the opening of the electronic expansion valve 1 is further adjusted. Otherwise, the speed is increased. In this embodiment, when the temperature T AC When it is greater than t2, it indicates that the cooling demand of the passenger compartment 4 is not met. By judging the rotation speed of the compressor 5, if it is the maximum rotation speed, the opening of the electronic expansion valve 1 is adjusted to meet the cooling demand of the passenger compartment 4; if it is not the maximum rotation speed, the rotation speed is increased to meet the cooling demand of the passenger compartment 4.

[0033] See also Figure 3 As shown, in some embodiments, further adjusting the opening of the electronic expansion valve 1 includes: determining whether the current opening of the electronic expansion valve 1 is the minimum opening P that meets the cooling demand of the power battery 2.min If yes, the maximum speed of the compressor 5 is maintained, otherwise the opening of the electronic expansion valve 1 is reduced. In this embodiment, when the speed of the compressor 5 is already at the maximum speed, the opening of the electronic expansion valve 1 is adjusted to the minimum opening P that meets the cooling demand of the power battery 2. min , so that it can meet the cooling needs of the passenger compartment 4.

[0034] See also Figure 3 As shown, in some embodiments, adjusting the opening of the electronic expansion valve 1 according to the current state of the vehicle to meet the cooling demand of the power battery 2 may include: if the vehicle is currently in a driving state, adjusting the opening of the electronic expansion valve 1 to a minimum opening P that meets the cooling power demand of the power battery 2 min If it is in the charging state, the opening of the electronic expansion valve 1 is adjusted to a preset value according to the current ambient temperature, so that the opening of the electronic expansion valve 1 meets the cooling power requirement of the power battery 2.

[0035] In order to ensure the cooling effect of the passenger compartment, the temperature range of the evaporator 3 in the dual cooling mode is defined according to the ambient temperature and light intensity of the vehicle use area, the lower temperature limit t1 and the upper temperature limit t2;

[0036] In order to meet the cooling power requirement of the power battery 2, the opening range of the electronic expansion valve 1 is determined according to the superheat, and the minimum opening P min and maximum opening P max , and define a target water inlet temperature t3 for driving and a target water inlet temperature t4 for charging;

[0037] In the charging dual cooling working mode, the opening of the electronic expansion valve 1 is calibrated at different ambient temperatures. On the premise that the cooling rate of the passenger compartment 4 meets the regulations, the maximum opening of the electronic expansion valve 1 at different ambient temperatures is verified and calibrated through experiments, as shown in the following table (Table 1):

[0038] Ambient temperature (℃) Electronic expansion valve opening T＜30 P1 30≤T＜33 P2 33≤T＜36 P3 36≤T＜39 P4 T≥39 P5

[0039] When the thermal management controller receives cooling requirements from the passenger compartment 4 and the power battery 2 at the same time, it first determines whether the vehicle is in driving or charging state. If it is in driving state, the cooling of the passenger compartment 4 is prioritized, and the electronic expansion valve 1 is adjusted to the minimum opening; if it is in charging state, while ensuring the cooling effect of the passenger compartment 4, more cooling capacity is allocated to the power battery 2 as much as possible, and the opening of the electronic expansion valve 1 is adjusted to a preset value according to the current ambient temperature.

[0040] Next step is to determine the passenger compartment evaporator 3 temperature T AC The temperature range is T AC Divided into three temperature ranges: T AC <t1,t1≤T AC <t2,TAC ≥t2.

[0041] When T AC When t1 is less than, the current opening of the electronic expansion valve 1 is determined. If it is not at the maximum opening P max , then increase the opening, otherwise reduce the speed of compressor 5, and then re-judge the evaporator 3 temperature T AC The temperature range in which it is located;

[0042] When t1≤T AC When t2 is less than, first compare the water inlet temperature of the power battery 2 with the target value (differentiate between driving and charging target water temperatures). If the water inlet temperature is ≤ the target value, reduce the speed of the compressor 5. Otherwise, determine the current opening of the electronic expansion valve 1. If it is not at the maximum opening P max , then increase the opening, otherwise determine the speed of compressor 5, if it is at the maximum speed state, maintain the maximum speed, otherwise increase the speed. Finally, re-determine the temperature T of evaporator 3 AC The temperature range in which it is located;

[0043] When T AC ≥t2, determine the current speed of the compressor 5. If it is not the maximum speed, increase the speed. Otherwise, determine the opening of the electronic expansion valve 1. If the current opening is the minimum opening P min , then keep the compressor 5 at the highest speed, otherwise reduce the opening degree. Then re-judge the evaporator 3 temperature T AC The temperature range.

[0044] The embodiment of the present invention further provides a thermal management dual refrigeration control system for electric vehicles, which may include: a judgment module, which is used to judge the temperature T of the evaporator 3 AC Whether it is within the temperature range t1-t2 that meets the cooling demand of the passenger compartment 4; a control module, which is used to adjust the opening of the electronic expansion valve 1 according to the current state of the vehicle to meet the cooling demand of the power battery 2, and at the temperature T of the evaporator 3 AC When the temperature is within the temperature range t1 to t2, further adjustment is made according to the actual water inlet temperature of the power battery 2. When the temperature is not within the temperature range t1 to t2, the opening of the electronic expansion valve 1 is continuously adjusted until the temperature T of the evaporator 3 reaches t1. ACIn the temperature range t1 to t2. In the dual cooling working mode, different electronic expansion valve opening values ​​can be preset for the driving state and the charging state, and the passenger compartment evaporator temperature can be zoned. Different control strategies are adopted in different intervals to meet the cooling needs of the passenger compartment 4 and the power battery 2 under different working conditions. When driving, the cooling of the passenger compartment 4 is given priority. When charging, the cooling effect of the passenger compartment 4 is taken into account, and more cooling capacity is allocated to the power battery 2 as quickly as possible to better suppress the battery temperature rise caused by high-current charging. This strategy is simple, reliable, easy to implement, and low-cost.

[0045] An embodiment of the present invention further provides an automobile, which includes the above-mentioned thermal management dual refrigeration control system for electric vehicles.

[0046] See also Figure 4 , the vehicle is powered on and the cooling requirements of the passenger compartment 4 and the power battery 2 are determined in real time.

[0047] 1) There is no cooling demand for the passenger compartment 4 and the power battery 2. If the thermal management system is currently in cooling state, the cooling is turned off, otherwise the current off state is maintained;

[0048] 2) If the passenger compartment 4 requires cooling and the power battery 2 does not, the power battery cooling is turned off, the opening of the electronic expansion valve 1 is adjusted to 0, the refrigerant valve 7 is opened, and the cooling is turned on according to the single passenger compartment cooling mode strategy.

[0049] 3) If the passenger compartment 4 has no cooling demand but the power battery 2 requires cooling, the passenger compartment cooling is turned off, the refrigerant valve 7 is closed, the electronic expansion valve 1 is opened, and the cooling is turned on according to the single power battery cooling mode strategy.

[0050] 4) When the passenger compartment 4 and the power battery 2 require cooling, the refrigerant valve 7 and the electronic expansion valve 1 are opened, and the cooling is performed according to Figure 3 Dual cooling mode control method turns on dual cooling;

[0051] The dual cooling mode control method is further described below with reference to an example.

[0052] Determine the heat load of the passenger compartment 4 according to the use area, and determine the temperature range of the evaporator 3 in the dual cooling mode, such as 9 to 12°C, the lowest temperature t1 = 9°C, and the highest temperature t2 = 12°C;

[0053] Next, determine the opening range of the electronic expansion valve according to the overheat of the battery cooling circuit, such as the minimum opening P min =200° and maximum opening P max =450°; define the target water inlet temperature based on the battery heat generation and heat exchange efficiency, such as the target water inlet temperature t3 = 20°C for driving ， The target water inlet temperature for charging is t4 = 15°C;

[0054] Next, in the charging dual cooling working mode, the opening of the electronic expansion valve is calibrated at different ambient temperatures. On the premise that the passenger compartment cooling rate meets the regulations, the maximum opening of the electronic expansion valve at different ambient temperatures is verified and calibrated through experiments, as shown in the following table (Table 2):

[0055]

[0056]

[0057] See also Figure 3 After receiving the dual cooling demand, the thermal management controller confirms the current vehicle status through the CAN message. If it is in the driving state, the electronic expansion valve 1 is first adjusted to the minimum opening of 200°; if it is in the charging state, the electronic expansion valve 1 opening preset in Table 2 is checked according to the current ambient temperature, and the electronic expansion valve 1 is adjusted to the preset opening.

[0058] Next, the passenger compartment 4 evaporator temperature T AC Control is divided into three intervals.

[0059] When T AC When the temperature is less than 9℃, the current opening of the electronic expansion valve 1 is determined. If it is not at the maximum opening P max , then increase the opening, otherwise reduce the compressor speed, and then re-judge the evaporator 3 temperature T AC The temperature range in which it is located;

[0060] When 9℃≤T AC When the temperature is less than 12℃, the water inlet temperature of the power battery 2 is first compared with the target value (differentiating between driving and charging target water temperatures). If the water inlet temperature is ≤ the target value, the speed of the compressor 5 is reduced. Otherwise, the current opening of the electronic expansion valve 1 is determined. If it is not at the maximum opening P max , then increase the opening, otherwise determine the speed of compressor 5, if it is at the maximum speed state, maintain the maximum speed, otherwise increase the speed. Finally, re-determine the temperature T of evaporator 3 AC The temperature range in which it is located;

[0061] When T AC ≥12℃, determine the current speed of compressor 5. If it is not the maximum speed, increase the speed. Otherwise, determine the opening of electronic expansion valve 1. If the current opening is the minimum opening P min , then keep the compressor 5 at the highest speed, otherwise reduce the opening degree. Then re-judge the evaporator 3 temperature T AC The temperature range.

[0062] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0063] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0064] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A thermal management dual cooling control method for electric vehicles, characterized in that: It includes: The opening of the electronic expansion valve (1) is adjusted according to the current state of the vehicle so as to meet the cooling demand of the power battery (2); Determine the temperature T of the evaporator (3) AC Whether the temperature is within a temperature range t1 to t2 that satisfies the cooling demand of the passenger compartment (4); if so, further adjustment is made according to the actual water inlet temperature of the power battery (2); otherwise, the opening of the electronic expansion valve (1) or the speed of the compressor (5) is continuously adjusted until the temperature T of the evaporator (3) reaches the value T AC In the temperature range t1 to t2; Specifically, when T AC When t1 is less than, the current opening of the electronic expansion valve (1) is determined. If it is not at the maximum opening P max , then increase the opening, otherwise reduce the speed of the compressor (5) and then re-determine the temperature T of the evaporator (3) AC In the temperature range; when t1≤T AC When t2 is less than, the water inlet temperature of the power battery (2) is first compared with the target value. If the water inlet temperature is less than or equal to the target value, the speed of the compressor (5) is reduced. Otherwise, the current opening of the electronic expansion valve (1) is determined. If it is not at the maximum opening P max , then increase the opening, otherwise determine the speed of the compressor (5), if it is at the maximum speed state, maintain the maximum speed, otherwise increase the speed; finally re-determine the temperature T of the evaporator (3) AC In the temperature range; when T AC ≥t2, the current speed of the compressor (5) is determined. If it is not the maximum speed, the speed is increased. Otherwise, the opening of the electronic expansion valve (1) is determined. If the current opening is the minimum opening P min , then keep the compressor (5) at the highest speed, otherwise reduce the opening degree; then re-determine the temperature T of the evaporator (3) AC The temperature range.

2. The thermal management dual cooling control method for electric vehicles according to claim 1, characterized in that: The step of adjusting the opening of the electronic expansion valve (1) according to the current state of the vehicle so as to meet the cooling demand of the power battery (2) comprises: If the vehicle is currently in a driving state, the opening of the electronic expansion valve (1) is adjusted to a minimum opening P that meets the cooling power requirement of the power battery (2). min If it is in the charging state, the opening of the electronic expansion valve (1) is adjusted to a preset value according to the current ambient temperature, so that the opening of the electronic expansion valve (1) meets the cooling power requirement of the power battery (2).

3. A thermal management dual refrigeration control system for electric vehicles, applicable to the thermal management dual refrigeration control method for electric vehicles according to any one of claims 1-2, characterized in that: It includes: A judgment module is used to judge the temperature T of the evaporator (3) AC whether the temperature is within a temperature range t1 to t2 that satisfies the cooling demand of the passenger compartment (4); The control module is used to adjust the opening of the electronic expansion valve (1) according to the current state of the vehicle so as to meet the cooling demand of the power battery (2) and to adjust the temperature T of the evaporator (3). AC When the temperature is within the temperature range t1 to t2, further adjustment is made according to the actual water inlet temperature of the power battery (2); when the temperature is not within the temperature range t1 to t2, the opening of the electronic expansion valve (1) is continuously adjusted until the temperature T of the evaporator (3) reaches t1. AC It is within the temperature range t1 to t2.

4. A car, characterized in that: It includes the thermal management dual refrigeration control system for electric vehicles as described in claim 3.

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