Refrigeration control method and vehicle

Abstract

Disclosed are a refrigeration control method and a vehicle. The refrigeration control method is used for a thermal management system (10) of the vehicle. The thermal management system (10) comprises a cooling liquid circuit (11) and a refrigerant circuit (12). The refrigerant circuit comprises a condenser (13), a compressor (16), an evaporator (15) and a first heat exchanger (17) which are connected in series. The compressor comprises an air inlet (18) and an air outlet (19), wherein the air inlet is connected to the evaporator, and the air outlet is connected to the first heat exchanger and the condenser. The cooling liquid circuit comprises a cooling liquid branch (35). The cooling liquid branch passes through the first heat exchanger and comprises a first control valve (37) located upstream of the first heat exchanger. The refrigeration control method comprises: in a refrigeration mode, acquiring the pressure at an air outlet of a compressor; and controlling a first control valve according to the pressure at the air outlet of the compressor, and in response to the pressure being greater than or equal to a first set pressure value, turning on the first control valve, so that a cooling liquid flowing through a cooling liquid branch exchanges heat at a first heat exchanger with a refrigerant flowing through a refrigerant circuit.

Description

Refrigeration control method and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202310710536.1, filed on June 15, 2023, the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to, but is not limited to, the field of vehicle technology, and in particular to a refrigeration control method and a vehicle. Background Art

[0004] With the gradual development of technology, new energy vehicles are gradually entering people's horizons. New energy vehicles are vehicles that use unconventional automotive fuels as their power source. New energy vehicles often have functions such as cooling and heating.

[0005] Summary of the Invention

[0006] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0007] The present application provides a refrigeration control method and a vehicle with high heat exchange efficiency.

[0008] On the one hand, the present application provides a refrigeration control method for a thermal management system of a vehicle, the thermal management system including a coolant circuit and a refrigerant circuit; the refrigerant circuit including a condenser, a compressor, an evaporator and a first heat exchanger connected in series; the compressor including an air inlet and an air outlet, the air inlet being connected to the evaporator, and the air outlet being connected to the first heat exchanger and the condenser; the coolant circuit including a coolant branch; the coolant branch passing through the first heat exchanger and including a first control valve located upstream of the first heat exchanger; the refrigeration control method including: in a refrigeration mode of the vehicle, obtaining the pressure at the air outlet of the compressor; and controlling the first control valve according to the pressure at the air outlet of the compressor, including: in response to the pressure being greater than or equal to a first set pressure value, opening the first control valve so that the coolant flowing through the coolant branch and the refrigerant flowing through the refrigerant circuit exchange heat at the first heat exchanger.

[0009] Optionally, the thermal management system includes a first air duct and a second air duct separately arranged, the evaporator is arranged in the first air duct, and the condenser is arranged in the second air duct; a first damper is provided between the first air duct and the interior of the vehicle, on the air outlet side of the evaporator; a second damper is provided between the second air duct and the outside of the vehicle, on the air outlet side of the condenser; the refrigerant circuit includes a second control valve, and the second control valve is provided between the condenser and the evaporator; the refrigeration control method also includes: obtaining the temperature of the interior of the vehicle; and controlling the second control valve, the first damper and the second damper according to the temperature of the interior of the vehicle, including: opening the second control valve, and opening the first damper and the second damper in response to the temperature of the interior of the vehicle being greater than the set temperature.

[0010] Optionally, the refrigeration control method further includes: acquiring the temperature inside the vehicle; and determining the first set pressure value according to the temperature inside the vehicle.

[0011] Optionally, determining the first set pressure value based on the temperature inside the vehicle includes: determining a temperature value closest to the temperature inside the vehicle based on a mapping relationship between temperature and pressure, and obtaining a pressure value corresponding to the closest temperature value as the first set pressure value, wherein the mapping relationship between temperature and pressure is a mapping relationship between the temperature value inside the vehicle and the set pressure value at the air outlet of the compressor.

[0012] Optionally, controlling the first control valve according to the pressure at the air outlet of the compressor includes: in response to the pressure being greater than or equal to the first set pressure value and less than a second set pressure value, adjusting the opening of the first control valve according to the real-time pressure at the air outlet of the compressor; wherein the opening of the first control valve is proportional to the pressure at the air outlet; when the pressure is equal to the second set pressure value, the opening of the first control valve is maximum.

[0013] Optionally, controlling the first control valve according to the pressure at the air outlet of the compressor includes: closing the first control valve in response to the pressure being less than a third set pressure value.

[0014] Optionally, the thermal management system includes a condenser fan arranged on the air inlet side of the condenser, and the condenser fan is configured to supply air to the condenser; the refrigeration control method also includes: obtaining the temperature inside the vehicle; and determining the speed of the condenser fan based on the temperature inside the vehicle and the pressure at the air outlet of the compressor.

[0015] Optionally, determining the rotational speed of the condenser fan based on the temperature inside the vehicle and the pressure at the air outlet of the compressor includes: determining the first set pressure value based on the temperature inside the vehicle; in response to the pressure at the air outlet of the compressor being less than the first set pressure value, adjusting the rotational speed of the condenser fan based on the pressure at the air outlet of the compressor; wherein the rotational speed of the condenser fan is proportional to the pressure at the air outlet of the compressor.

[0016] Optionally, the thermal management system includes a temperature sensor and a condenser fan arranged on the air inlet side of the condenser, the temperature sensor is arranged on the condenser and is configured to detect the surface temperature of the condenser; the condenser fan is configured to supply air to the condenser; the refrigeration control method also includes: increasing the speed of the condenser fan and obtaining the temperature of the temperature sensor; in response to the temperature increase of the temperature sensor, further increasing the speed of the condenser fan; in response to the temperature decrease of the temperature sensor, reducing the speed of the condenser fan.

[0017] Optionally, the second set pressure value is a fixed value, and the range of the second set pressure value is between 24 bar and 26 bar.

[0018] Optionally, the third set pressure value is a fixed value, and the third set pressure value is 1.8 bar.

[0019] On the other hand, the present application provides a vehicle, including a thermal management system and a controller, wherein the controller is connected to the thermal management system and is configured to execute the cooling control method as described in any of the above embodiments.

[0020] The refrigeration control method provided in the present application can open the first control valve when the pressure at the air outlet of the compressor is greater than or equal to the first set pressure value, so that the coolant flowing through the coolant branch and the refrigerant flowing through the refrigerant circuit can exchange heat at the first heat exchanger, so that in the refrigeration mode, the refrigerant from the compressor can be condensed by both the condenser and the first heat exchanger, so that the condensation of the refrigerant is more complete, the heat exchange efficiency is higher, and the user experience is good.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and explanatory and are not limiting of the present application. Other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] FIG1 is a schematic diagram showing a thermal management system of a vehicle according to an exemplary embodiment of the present application.

[0024] FIG2 is a flow chart showing a refrigeration control method according to an exemplary embodiment of the present application.

[0025] FIG3 is another flow chart of a refrigeration control method according to an exemplary embodiment of the present application.

[0026] FIG4 is another flow chart showing a refrigeration control method according to an exemplary embodiment of the present application.

[0027] FIG5 is another flow chart showing a refrigeration control method according to an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0028] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0029] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, technical or scientific terms used in this application should have the ordinary meaning understood by a person of ordinary skill in the art to which this application belongs. The terms "first," "second," and similar words used in this specification and claims do not indicate any order, quantity, or importance, but are simply used to distinguish different components. Similarly, terms such as "a" or "an" do not indicate a quantitative limitation, but rather indicate the presence of at least one. "Multiple" or "several" means two or more. Unless otherwise indicated, terms such as "front," "rear," "lower," and / or "upper," "top," and "bottom" are used for ease of description only and are not limited to a single position or spatial orientation. Terms such as "include" or "comprises" mean that the elements or objects listed before "include" or "comprises" include the elements or objects listed after "include" or "comprises," and their equivalents, and do not exclude other elements or objects. The words “connected” or “connected” and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0030] As used in this application and the appended claims, the singular forms "a," "an," "said," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0031] When some vehicles are in cooling mode, they rely only on a single condenser to transfer heat from inside the vehicle to outside the vehicle. When the temperature inside the vehicle is high, the heat dissipation rate is slow, resulting in low heat exchange efficiency and poor user experience.

[0032] In view of this, the present application provides a cooling control method and a vehicle. The vehicle may be a new energy vehicle. The vehicle includes a thermal management system and a controller, the controller being connected to the thermal management system and configured to execute the cooling control method.

[0033] As shown in FIG1 , the thermal management system 10 includes a coolant circuit 11 and a refrigerant circuit 12. The coolant circuit 11 is indicated by the dashed arrow in FIG1 , and the refrigerant circuit 12 is indicated by the solid arrow in FIG1 . The refrigerant circuit 12 includes a condenser 13, a second control valve 14, an evaporator 15, a compressor 16, and a first heat exchanger 17, which are connected in series. The second control valve 14 is disposed between the condenser 13 and the evaporator 15. The compressor 16 includes an air inlet 18 and an air outlet 19. The air inlet 18 is connected to the evaporator 15, and the air outlet 19 is connected to the first heat exchanger 17 and the condenser 13. The first heat exchanger 17 and the condenser 13 are connected in series. A first sensor 20 is disposed on the pipeline connected to the air inlet 18 of the compressor 16, and a second sensor 21 is disposed on the pipeline connected to the air outlet 19 of the compressor 16. The first sensor 20 and the second sensor 21 may be temperature and pressure sensors that can be used to detect pressure and temperature, thereby adjusting the speed of the compressor 16 based on the detected pressure and temperature. In this embodiment, the air outlet 19 of the compressor 16 is connected to one end of the first heat exchanger 17, the other end of the first heat exchanger 17 is connected to one end of the condenser 13, the other end of the condenser 13 is connected to one end of the second control valve 14, the other end of the second control valve 14 is connected to one end of the evaporator 15, and the other end of the evaporator 15 is connected to the air inlet 18 of the compressor 16. A controller is connected to the second control valve 14 and can control the opening / closing of the second control valve 14 and the opening degree of the second control valve 14. The second control valve 14 may be a solenoid valve or an electronic expansion valve.

[0034] In some embodiments, the thermal management system 10 includes a first air duct 22 and a second air duct 23, which are arranged separately. The evaporator 15 is arranged in the first air duct 22, and the condenser 13 is arranged in the second air duct 23. This allows the evaporator 15 and the condenser 13 to be arranged separately. A first damper 24 is arranged between the first air duct 22 and the interior of the vehicle, on the air outlet side of the evaporator 15. The first damper 24 is arranged to open and close between the first air duct 22 and the interior of the vehicle. The first damper 24 can be rotated to open, thereby enabling communication between the first air duct 22 and the interior of the vehicle. A second damper 25 is arranged between the second air duct 23 and the exterior of the vehicle, on the air outlet side of the condenser 13. The second damper 25 is arranged to open and close between the second air duct 23 and the exterior of the vehicle, and can be rotated to open, thereby enabling communication between the second air duct 23 and the exterior of the vehicle.

[0035] In some embodiments, a third damper 26 is provided between the first air duct 22 and the exterior of the vehicle, on the air outlet side of the evaporator 15. The third damper 26 is openably (e.g., rotatably) disposed between the first air duct 22 and the exterior of the vehicle. The third damper 26 can be rotated to open, thereby enabling communication between the first air duct 22 and the exterior of the vehicle. A fourth damper 27 is provided between the second air duct 23 and the interior of the vehicle, on the air outlet side of the condenser 13. The fourth damper 27 is openably (e.g., rotatably) disposed between the second air duct 23 and the interior of the vehicle. The fourth damper 27 can be rotated to open, thereby enabling communication between the second air duct 23 and the interior of the vehicle. Among them, the controller can be connected to the first damper 24, the second damper 25, the third damper 26 and the fourth damper 27, so that by controlling the first damper 24, the second damper 25, the third damper 26 and the fourth damper 27, the air outlet side of the evaporator 15 in the first air duct 22 can be connected to at most one of the interior of the vehicle and the outside of the vehicle, and the air outlet side of the condenser 13 in the second air duct 23 can be connected to at most one of the interior of the vehicle and the outside of the vehicle.

[0036] In some embodiments, the thermal management system 10 includes a fifth damper 28 disposed between the first air duct 22 and the second air duct 23. The fifth damper 28 is disposed between the first air duct 22 and the second air duct 23 in an openable and closable manner (e.g., rotatable). When the fifth damper 28 is in a first position, the first air duct 22 and the second air duct 23 are connected; when the fifth damper 28 is in a second position, the first air duct 22 and the second air duct 23 are disconnected. Thus, when the ambient temperature is too cold or too hot, the fifth damper 28 can be opened to mix the air. For example, when the ambient temperature is low and the temperature inside the vehicle is higher than the ambient temperature, the fifth damper 28 can be opened to connect the first air duct 22 and the second air duct 23, and the higher temperature inside the vehicle can be used to heat the condenser 13, thereby reducing energy consumption.

[0037] In some embodiments, the thermal management system 10 includes a condenser fan 29 disposed on the air inlet side of the condenser 13 and an evaporator fan 30 disposed on the air inlet side of the evaporator 15. The condenser fan 29 and the evaporator fan 30 may be blowers. The evaporator fan 30 is disposed in the first air duct 22 and is used to supply air to the evaporator 15. Air from the outside and / or inside of the vehicle can be delivered to the air inlet side of the evaporator 15. The condenser fan 29 is disposed in the second air duct 23 and is used to supply air to the condenser 13. Air from the outside and / or inside of the vehicle can be delivered to the air inlet side of the condenser 13. Thus, by disposing the evaporator fan 30 in the first air duct 22 and the condenser fan 29 in the second air duct 23, the condenser 13 and the evaporator 15 can be provided with independent air inlets.

[0038] In some embodiments, the coolant circuit 11 includes a first sub-coolant circuit 31, which includes a battery 32. The coolant can circulate in the first sub-coolant circuit 31 so that the coolant passes through the battery 32, thereby cooling or heating the battery 32 and maintaining the battery 32 within a suitable operating temperature range. The coolant can be a mixture of water and ethylene glycol.

[0039] In some embodiments, the coolant circuit 11 includes a second sub-coolant circuit 33, which includes a main coolant circuit 34 and a branch coolant circuit 35. The main coolant circuit 34 includes an electrical component 36. The electrical component 36 may include an on-board charger (OBC), a DC-DC converter, an autonomous driving domain controller (ADCU), a motor, etc. The coolant can circulate in the main coolant circuit 34 so that the coolant passes through the electrical component 36, thereby cooling the electrical component 36. The branch coolant circuit 35 passes through the first heat exchanger 17 and includes a first control valve 37 located upstream of the first heat exchanger 17. The first control valve 37 may be a proportional valve. A controller is connected to the first control valve 37 to control the opening and closing of the first control valve 37, and can also be used to control the opening degree of the first control valve 37. When the first control valve 37 is in an open state, coolant can be delivered to the first heat exchanger 17 so that the coolant and refrigerant can exchange heat at the first heat exchanger 17; when the first control valve 37 is in a closed state, the coolant does not flow through the first heat exchanger 17.

[0040] In some embodiments, the thermal management system 10 further includes a refrigerant branch 38, and the coolant circuit 11 includes a third sub-coolant circuit 39. The refrigerant branch 38 can be connected between the condenser 13 and the air inlet 18 of the compressor 16. The refrigerant branch 38 is connected in parallel with the evaporator 15. The refrigerant branch 38 includes a third control valve 40 and a second heat exchanger 41. The third control valve 40 is positioned upstream of the second heat exchanger 41 and between the condenser 13 and the second heat exchanger 41. The third control valve 40 can be a solenoid valve or an electronic expansion valve. A controller can control the opening and closing of the third control valve 40 to connect and disconnect the refrigerant branch 38. When the third control valve 40 is open, the refrigerant branch 38 is connected. At this time, the refrigerant flowing out of the condenser 13 can flow to the third control valve 40 and pass through the second heat exchanger 41. The third sub-cooling liquid circuit 39 passes through the second heat exchanger 41 , and the second heat exchanger 41 can be used to achieve heat exchange between the coolant in the third sub-cooling liquid circuit 39 and the refrigerant in the refrigerant branch 38 .

[0041] In some embodiments, the third sub-coolant circuit 39 includes a heater 42 for heating the coolant. Heater 42 may be a high-voltage coolant heater (HVCH). When the third control valve 40 is open and the heater 42 is on, the heated coolant flowing through the heater 42 exchanges heat with the refrigerant flowing through the refrigerant branch 38 at the second heat exchanger 41. Under low-temperature conditions, the coolant heated by the heater 42 can be used to increase the temperature at the second heat exchanger 41, thereby heating the refrigerant circuit 12 and gradually increasing the temperature inside the vehicle.

[0042] In some embodiments, the coolant circuit 11 includes a fourth sub-coolant circuit 43, which includes a radiator 44. Radiator 44 is used to cool the coolant. Optionally, radiator 44 includes a water tank 45 and a cooling fan 46. Cooling fan 46 can be positioned directly opposite water tank 45 to cool the coolant.

[0043] In some embodiments, the coolant circuit 11 includes a circuit control valve 47, and the first sub-coolant circuit 31, the second sub-coolant circuit 33, the third sub-coolant circuit 39, and the fourth sub-coolant circuit 43 are connected to the circuit control valve 47. A controller is connected to the circuit control valve 47 to control the circuit control valve 47, thereby controlling the first sub-coolant circuit 31, the second sub-coolant circuit 33, the third sub-coolant circuit 39, and the fourth sub-coolant circuit 43 to selectively communicate with each other.

[0044] In this embodiment, the circuit control valve 47 includes a first four-way valve 48 and a second four-way valve 49. The first sub-coolant circuit 31, the second sub-coolant circuit 33, the third sub-coolant circuit 39, and the fourth sub-coolant circuit 43 are all connected to the first four-way valve 48 and the second four-way valve 49. Using the first four-way valve 48 and the second four-way valve 49 to integrate the first sub-coolant circuit 31, the second sub-coolant circuit 33, the third sub-coolant circuit 39, and the fourth sub-coolant circuit 43 can further reduce assembly time and costs.

[0045] 1 and 2 , a cooling control method is used in a thermal management system 10 of a vehicle. The cooling control method includes steps S101 and S102 .

[0046] In step S101 , in the cooling mode of the vehicle, the pressure at the air outlet 19 of the compressor 16 is obtained. In the cooling mode, the controller may obtain the pressure at the air outlet 19 of the compressor 16 via the second sensor 21 .

[0047] In step S102, the first control valve 37 is controlled according to the pressure at the air outlet 19 of the compressor 16. The opening and closing of the first control valve 37 can be controlled, and the opening degree of the first control valve 37 can also be controlled. If the pressure is greater than or equal to the first set pressure value, the first control valve 37 is opened so that the coolant flowing through the coolant branch 35 and the refrigerant flowing through the refrigerant circuit 12 exchange heat at the first heat exchanger 17. At this time, the first heat exchanger 17 is equivalent to a water-cooled condenser (WCC). In this way, in the cooling mode, the condenser 13 and the first heat exchanger 17 can be used to condense the refrigerant from the compressor 16, so that the condensation of the refrigerant is more complete, thereby making the cooling effect of the evaporator 15 better, the heat exchange efficiency higher, and the user experience better.

[0048] 1 and 3 , in some embodiments, the refrigeration control method further includes steps S201 and S202 .

[0049] In step S201, the temperature inside the vehicle is acquired. Acquiring the temperature inside the vehicle may refer to acquiring the temperature inside the vehicle cabin.

[0050] In step S202, the second control valve 14, the first damper 24, and the second damper 25 are controlled based on the vehicle's interior temperature. If the vehicle's interior temperature exceeds a set temperature, the second control valve 14 is opened, and the first damper 24 and the second damper 25 are opened. The set temperature may be a user-set temperature. The refrigerant circuit 12 can be connected and disconnected by controlling the opening and closing of the second control valve 14. The amount of refrigerant flowing through the evaporator 15 can be controlled by controlling the opening degree of the second control valve 14. When the second control valve 14 is opened, the refrigerant circuit 12 is connected, and refrigerant can flow through the evaporator 15, the compressor 16, the first heat exchanger 17, the condenser 13, and the second control valve 14. At this point, the evaporator 15 can be used for cooling, lowering the vehicle's interior temperature. The condenser 13 can be used for heating, raising the vehicle's interior temperature. Opening the first damper 24 connects the first air duct 22 to the interior of the vehicle, allowing the cool air from the outlet side of the evaporator 15 to flow into the vehicle. Opening the second damper 25 connects the second air duct 23 to the exterior of the vehicle, allowing the hot air from the outlet side of the condenser 13 to flow outward. At this point, the third damper 26 and the fourth damper 27 can be closed. This puts the vehicle in cooling mode.

[0051] In some embodiments, the cooling control method further includes: determining a first set pressure value according to the temperature inside the vehicle. In this way, the first set pressure value can adapt to different temperatures inside the vehicle, and has better adaptability.

[0052] In some embodiments, determining a first set pressure value based on the vehicle's interior temperature includes determining, based on a temperature-pressure mapping relationship, a temperature value closest to the vehicle's interior temperature, and obtaining a pressure value corresponding to the closest temperature value as the first set pressure value. The temperature-pressure mapping relationship is a mapping relationship between the vehicle's interior temperature and the set pressure value at the compressor's air outlet. The mapping relationships between different temperatures and pressures can form multiple data groups, for example, data group 1 [temperature 1 - pressure 1], data group 2 [temperature 2 - pressure 2], ..., data group N [temperature N - pressure N]. The temperature value closest to the current vehicle's interior temperature can be compared and identified among the multiple data groups. Temperature 1, Temperature 2, ..., Temperature N in the data groups can be compared with the current vehicle's interior temperature to determine the temperature value closest to the current vehicle's interior temperature. Based on the temperature value closest to the vehicle's interior temperature, a pressure value corresponding to the closest temperature value can be obtained as the first set pressure value. This allows for a faster comparison process, thereby accelerating the acquisition of the first set pressure value.

[0053] In some embodiments, controlling the first control valve 37 based on the pressure at the air outlet 19 of the compressor 16 includes adjusting the opening of the first control valve 37 based on the real-time pressure at the air outlet 19 of the compressor 16 if the pressure is greater than or equal to a first set pressure value and less than a second set pressure value. The second set pressure value may be a fixed value, ranging from 24 bar to 26 bar. The opening of the first control valve 37 is proportional to the pressure at the air outlet 19 of the compressor 16. That is, the greater the pressure at the air outlet 19 of the compressor 16, the greater the opening of the first control valve 37, thereby increasing the flow rate of coolant through the first heat exchanger 17 and accelerating the heat exchange rate, thereby reducing the pressure at the air outlet 19 of the compressor 16. When the pressure is equal to the second set pressure value, the first control valve 37 is at its maximum opening. In this way, the opening of the first control valve 37 can be adjusted to the maximum before the compressor 16 reaches the critical pressure value, so that the flow rate of the coolant flowing through the first heat exchanger 17 is maximized, the heat exchange speed is faster, and the pressure of the compressor 16 can be reduced more quickly, thereby playing an explosion-proof role.

[0054] In some embodiments, controlling the first control valve 37 based on the pressure at the air outlet 19 of the compressor 16 includes closing the first control valve 37 if the pressure is less than a third set pressure value. The third set pressure value can be determined based on the temperature inside the vehicle. The third set pressure value can also be a fixed value, such as 1.8 bar, which is not limited in this application. Closing the first control valve 37 when the pressure is less than the third set pressure value allows the interior of the vehicle to be maintained at a comfortable temperature, thereby enhancing the user experience.

[0055] In some embodiments, the cooling control method further includes determining the rotational speed of the condenser fan 29 based on the vehicle interior temperature and the pressure at the air outlet 19 of the compressor 16. The first set pressure value can be determined based on the vehicle interior temperature. The rotational speed of the condenser fan 29 can be determined based on the relationship between the pressure at the air outlet 19 of the compressor 16 and the first set pressure value.

[0056] 1 and 4 , in some embodiments, the rotation speed of the condenser fan 29 is determined according to the temperature inside the vehicle and the pressure at the air outlet 19 of the compressor 16 , including steps S301 and S302 .

[0057] In step S301 , a first set pressure value is determined according to the temperature inside the vehicle.

[0058] In step S302, if the pressure at the air outlet 19 of the compressor 16 is less than the first set pressure value, the speed of the condenser fan 29 is adjusted based on the pressure at the air outlet 19 of the compressor 16. The speed of the condenser fan 29 is proportional to the pressure at the air outlet 19 of the compressor 16. That is, the higher the pressure at the air outlet 19 of the compressor 16, the faster the speed of the condenser fan 29. In this way, the speed of the condenser fan 29 can be adjusted based on the pressure at the air outlet 19 of the compressor 16. When the pressure is high, the speed of the condenser fan 29 can be increased, thereby improving the heat exchange efficiency of the condenser 13 and reducing the pressure at the air outlet 19 of the compressor 16.

[0059] 1 and 5 , in some embodiments, the thermal management system 10 includes a temperature sensor (not shown) and a condenser fan 29 disposed on the air inlet side of the condenser 13. The temperature sensor is disposed on the condenser 13 to detect the surface temperature of the condenser 13. The refrigeration control method further includes steps S401 and S402.

[0060] In step S401 , the rotation speed of the condenser fan 29 is controlled to increase, and the temperature of the temperature sensor is acquired.

[0061] In step S402, the speed of the condenser fan 29 is adjusted based on the temperature change of the temperature sensor. If the temperature of the temperature sensor increases, the speed of the condenser fan 29 is controlled to increase further. If the temperature of the temperature sensor decreases, the speed of the condenser fan 29 is controlled to decrease. When the speed of the condenser fan 29 increases and the temperature of the temperature sensor increases, the speed of the condenser fan 29 can be increased; when the speed of the condenser fan 29 increases and the temperature of the temperature sensor remains unchanged, the speed of the condenser fan 29 can be maintained unchanged; when the speed of the condenser fan 29 increases and the temperature of the temperature sensor decreases, the speed of the condenser fan 29 can be controlled to decrease. In this way, by controlling the speed of the condenser fan 29, the pressure at the air outlet 19 of the compressor 16 can be maintained at an appropriate level, thereby improving the cooling effect of the evaporator 15 and enhancing the user's comfort.

[0062] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0063] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A refrigeration control method for a thermal management system of a vehicle, the thermal management system comprising a coolant circuit and a refrigerant circuit; the refrigerant circuit comprising a condenser, a compressor, an evaporator and a first heat exchanger connected in series; the compressor comprising an air inlet and an air outlet, the air inlet being connected to the evaporator, and the air outlet being connected to the first heat exchanger and the condenser; the coolant circuit comprising a coolant branch; the coolant branch passing through the first heat exchanger and comprising a first control valve located upstream of the first heat exchanger; the refrigeration control method comprising: In a cooling mode of the vehicle, obtaining a pressure at the air outlet of the compressor; as well as Controlling the first control valve according to the pressure at the air outlet of the compressor comprises: In response to the pressure being greater than or equal to a first set pressure value, the first control valve is opened to allow the coolant flowing through the coolant branch circuit to exchange heat with the refrigerant flowing through the refrigerant circuit at the first heat exchanger.

2. The refrigeration control method according to claim 1, wherein: The thermal management system comprises a first air duct and a second air duct which are separated from each other, the evaporator is arranged in the first air duct, and the condenser is arranged in the second air duct; a first air door is arranged between the first air duct and the interior of the vehicle and on the air outlet side of the evaporator; a second air door is arranged between the second air duct and the exterior of the vehicle and on the air outlet side of the condenser; the refrigerant circuit comprises a second control valve, and the second control valve is arranged between the condenser and the evaporator; The refrigeration control method further comprises: obtaining a temperature of an interior of the vehicle; and According to the temperature inside the vehicle, controlling the second control valve, the first damper, and the second damper comprises: In response to the temperature of the interior of the vehicle being greater than a set temperature, the second control valve is opened, and the first damper and the second damper are opened.

3. The refrigeration control method according to claim 1, further comprising: obtaining a temperature inside the vehicle; The first set pressure value is determined according to the temperature inside the vehicle.

4. The refrigeration control method according to claim 3, wherein: The step of determining the first set pressure value according to the temperature inside the vehicle includes: Based on the mapping relationship between temperature and pressure, a temperature value closest to the temperature inside the vehicle is determined, and a pressure value corresponding to the closest temperature value is obtained as the first set pressure value, wherein the mapping relationship between temperature and pressure is a mapping relationship between the temperature value inside the vehicle and the set pressure value at the air outlet of the compressor.

5. The refrigeration control method according to any one of claims 1 to 4, wherein: The controlling the first control valve according to the pressure at the air outlet of the compressor comprises: In response to the pressure being greater than or equal to the first set pressure value and less than a second set pressure value, adjusting the opening of the first control valve according to the real-time pressure at the air outlet of the compressor; The opening of the first control valve is proportional to the pressure at the gas outlet; when the pressure is equal to the second set pressure value, the opening of the first control valve is maximum.

6. The refrigeration control method according to any one of claims 1 to 5, wherein: The controlling the first control valve according to the pressure at the air outlet of the compressor comprises: In response to the pressure being less than a third set pressure value, the first control valve is closed.

7. The refrigeration control method according to claim 1, wherein: The thermal management system includes a condenser fan disposed on an air inlet side of the condenser, the condenser fan being configured to supply air to the condenser; The refrigeration control method further comprises: obtaining a temperature inside the vehicle; The rotation speed of the condenser fan is determined according to the temperature inside the vehicle and the pressure at the air outlet of the compressor.

8. The refrigeration control method according to claim 7, wherein: The step of determining the rotation speed of the condenser fan according to the temperature inside the vehicle and the pressure at the air outlet of the compressor comprises: determining the first set pressure value according to the temperature inside the vehicle; In response to the pressure at the air outlet of the compressor being less than the first set pressure value, the speed of the condenser fan is adjusted according to the pressure at the air outlet of the compressor; wherein the speed of the condenser fan is proportional to the pressure at the air outlet of the compressor.

9. The refrigeration control method according to claim 1, wherein: The thermal management system includes a temperature sensor and a condenser fan arranged on the air inlet side of the condenser, wherein the temperature sensor is arranged on the condenser and is configured to detect the surface temperature of the condenser; The condenser fan is configured to supply air to the condenser; The refrigeration control method further comprises: Increasing the rotation speed of the condenser fan and obtaining the temperature of the temperature sensor; In response to an increase in the temperature of the temperature sensor, further increasing the rotation speed of the condenser fan; In response to a decrease in the temperature of the temperature sensor, the rotational speed of the condenser fan is decreased.

10. The refrigeration control method according to claim 5, wherein: The second set pressure value is a fixed value, and the range of the second set pressure value is between 24 bar and 26 bar.

11. The refrigeration control method according to claim 6, wherein: The third set pressure value is a fixed value, and the third set pressure value is 1.8 bar. 12 . A vehicle, comprising a thermal management system and a controller, wherein the controller is connected to the thermal management system and is configured to execute the cooling control method according to claim 1 .

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