Control method and device for vehicle cooling system

Abstract

This invention provides a control method and apparatus for a vehicle cooling system, belonging to the field of vehicle control. The method includes: switching between battery pack cooling mode and passenger compartment cooling mode by adjusting the compressor speed and the switching valve on the cooling circuit, in either battery pack cooling mode or passenger compartment cooling mode. When simultaneously cooling the passenger compartment and battery pack using both battery pack cooling mode and passenger compartment cooling mode, the air conditioning compressor speed is determined jointly by both modes. Furthermore, the opening degree of the second switching valve in the second cooling circuit corresponding to the battery pack cooling mode is determined by the first target speed of the air conditioning compressor. This allows for adjustment of the compressor speed and the opening degree of the switching valve according to different cooling needs, thereby meeting the cooling requirements of different modes and improving the flexibility and accuracy of the vehicle cooling system.

Description

Technical Field

[0001] This invention relates to the field of vehicle control, and in particular to a control method and apparatus for a vehicle cooling system. Background Technology

[0002] Currently, new energy vehicles generally use a shared air conditioning compressor for both the passenger compartment and the battery pack as a cooling source. This air conditioning compressor can cool the passenger compartment or the battery pack individually, or it can cool both the passenger compartment and the battery pack simultaneously.

[0003] In related technologies, during the cooling process of an air conditioning compressor, when switching between cooling the passenger compartment, cooling the battery pack, or simultaneously cooling both the passenger compartment and the battery pack, only the valve on the circuit with cooling demand is opened, while the valves on other circuits without cooling demand are closed. This ensures that the air conditioning compressor cools the corresponding circuit. For example, if the passenger compartment is currently being cooled by the air conditioning compressor, and the battery pack also needs cooling, then the switch valve on the circuit corresponding to the battery pack needs to be opened, so that the air conditioning compressor can simultaneously cool both the passenger compartment and the battery pack.

[0004] However, the above solution does not adjust the compressor speed and valve opening according to different cooling needs when switching between different modes, which results in low flexibility and accuracy of vehicle cooling system cooling in different modes, leading to a poor user experience. Summary of the Invention

[0005] This invention provides a control method and apparatus for a vehicle cooling system, which can solve the problems of low flexibility and accuracy in vehicle cooling systems in related technologies. The technical solution is as follows:

[0006] On one hand, a control method for a vehicle cooling system is provided, the method comprising:

[0007] In the first cooling mode, if a cooling demand corresponding to the second cooling mode is received, a first target speed of the air conditioning compressor is determined based on the first cooling mode and the second cooling mode. The first target speed is used to meet the cooling demand corresponding to the first cooling mode and the second cooling mode. The first cooling mode includes one of a passenger cabin cooling mode for cooling the passenger cabin and a battery pack cooling mode for cooling the battery pack. The second cooling mode includes the other of the passenger cabin cooling mode and the battery pack cooling mode.

[0008] If the first cooling mode is the battery pack cooling mode, then after adjusting the first switching valve in the first cooling circuit corresponding to the passenger compartment cooling mode from the closed state to the open state, the speed of the air conditioning compressor is adjusted to the first target speed. During the process of adjusting the speed of the air conditioning compressor to the first target speed, the opening degree of the second switching valve in the second cooling circuit corresponding to the battery pack cooling mode is adjusted to the first target opening degree. The second switching valve is in the open state in the battery pack cooling mode, and the first target opening degree is determined according to the first target speed of the air conditioning compressor.

[0009] If the first cooling mode is the passenger cabin cooling mode, then during the process of adjusting the speed of the air conditioning compressor to the first target speed, the second switching valve in the second cooling circuit is adjusted from the closed state to the second target opening degree. In the passenger cabin cooling mode, the first switching valve is in the open state, and the second target opening degree is determined according to the first target speed of the compressor.

[0010] Optionally, determining the first target speed of the air conditioner compressor based on the first cooling mode and the second cooling mode includes:

[0011] Determine the first speed of the air conditioner compressor corresponding to the first cooling mode and determine the second speed of the air conditioner compressor corresponding to the second cooling mode;

[0012] The first target rotational speed is determined based on the first rotational speed and the second rotational speed.

[0013] Optionally, when the first cooling mode is the passenger compartment cooling mode, determining the first speed of the air conditioning compressor corresponding to the first cooling mode includes:

[0014] Obtain the current ambient temperature, the current sunlight intensity, the actual evaporator temperature, and the rate of temperature change of the actual evaporator temperature;

[0015] The target evaporator temperature of the air conditioner evaporator is determined based on the ambient temperature and the light intensity.

[0016] The first rotational speed is determined based on the target evaporator temperature, the actual evaporator temperature, the ambient temperature, and the rate of temperature change.

[0017] Optionally, when the first cooling mode is the passenger compartment cooling mode, determining the second speed of the air conditioning compressor corresponding to the second cooling mode includes:

[0018] The average battery temperature, ambient temperature, battery cooling inlet temperature in the second cooling circuit, and target inlet temperature of the battery pack are obtained. The target inlet temperature is determined based on the highest cell temperature of the battery in the battery pack.

[0019] The second initial speed of the air conditioning compressor is determined based on the average battery temperature and the ambient temperature.

[0020] The third compensation speed is determined based on the battery cooling inlet temperature and the target inlet temperature.

[0021] The second rotational speed is determined based on the second initial rotational speed and the third compensated rotational speed.

[0022] Optionally, the method further includes:

[0023] If the passenger cabin cooling mode and the battery pack cooling mode are activated, and a cooling demand to deactivate the battery pack cooling mode is received, then the third speed of the air conditioning compressor corresponding to the passenger cabin cooling mode is determined. When the passenger cabin cooling mode and the battery pack cooling mode are activated simultaneously, the first switch valve and the second switch valve are in the open state.

[0024] During the process of reducing the speed of the air conditioner compressor to the third speed, the second switching valve on the second refrigeration circuit is closed.

[0025] Optionally, the method further includes:

[0026] If the passenger cabin cooling mode and the battery pack cooling mode are activated, and a cooling demand to deactivate the passenger cabin cooling mode is received, then the fourth speed of the air conditioning compressor corresponding to the battery pack cooling mode is determined and the fourth target opening degree of the second switching valve is determined. When the passenger cabin cooling mode and the battery pack cooling mode are activated simultaneously, the first switching valve and the second switching valve are in the open state.

[0027] After the speed of the air conditioner compressor drops to the fourth speed, the first switching valve in the first refrigeration circuit is adjusted to the closed state. During the process of the air conditioner compressor speed dropping to the fourth speed, the opening degree of the second switching valve is adjusted to the fourth target opening degree.

[0028] Optionally, the method further includes:

[0029] In battery pack cooling mode, if a cooling demand is received that the battery pack cooling mode is turned off and the passenger compartment cooling mode is turned on, the fifth speed of the air conditioning compressor corresponding to the passenger compartment cooling mode is determined. Then, the first switch valve is adjusted from the closed state to the open state, the second switch valve is closed, and the speed of the air conditioning compressor is adjusted to the fifth speed.

[0030] Optionally, the method further includes:

[0031] In the passenger cabin cooling mode, if a cooling demand is received that the battery pack cooling mode is turned on and the passenger cabin cooling mode is turned off, the sixth speed of the air conditioning compressor corresponding to the battery pack cooling mode is determined, the first switch valve is closed, and the second switch valve is adjusted from the closed state to the open state, and the speed of the air conditioning compressor is adjusted to the sixth speed.

[0032] Optionally, in the process of adjusting the speed of the air conditioner compressor to the first target speed, adjusting the second switching valve in the second refrigeration circuit from the closed state to the second target opening degree includes:

[0033] After adjusting the speed of the air conditioner compressor to the seventh speed according to the first speed change rate, the second switch valve is adjusted from the closed state to the third target opening degree and the second switch valve is kept at the third target opening degree for a first preset time. After the first preset time, the opening degree of the second switch valve is increased from the third target opening degree to the second target opening degree, and the speed of the air conditioner compressor is adjusted to the first target speed according to the second speed change rate.

[0034] On the other hand, a control device for a vehicle cooling system is provided, the device comprising:

[0035] The first determining module is used to determine a first target speed of the air conditioning compressor based on the first cooling mode and the second cooling mode if a cooling demand corresponding to the second cooling mode is received in the first cooling mode. The first target speed is used to meet the cooling demand corresponding to the first cooling mode and the second cooling mode. The first cooling mode includes one of a passenger cabin cooling mode for cooling the passenger cabin and a battery pack cooling mode for cooling the battery pack. The second cooling mode includes the other of the passenger cabin cooling mode and the battery pack cooling mode.

[0036] The first adjustment module is used to, if the first cooling mode is the battery pack cooling mode, adjust the first switching valve in the first cooling circuit corresponding to the occupant cabin cooling mode from the closed state to the open state, and then adjust the speed of the air conditioning compressor to the first target speed. In the process of adjusting the speed of the air conditioning compressor to the first target speed, the opening degree of the second switching valve in the second cooling circuit corresponding to the battery pack cooling mode is adjusted to the first target opening degree. The second switching valve is in the open state in the battery pack cooling mode, and the first target opening degree is determined according to the first target speed of the air conditioning compressor.

[0037] The second adjustment module is used to adjust the second switching valve in the second refrigeration circuit from a closed state to a second target opening degree when the speed of the air conditioning compressor is adjusted to the first target speed if the first refrigeration mode is the occupant cabin refrigeration mode. The first switching valve is in an open state in the occupant cabin refrigeration mode, and the second target opening degree is determined according to the first target speed of the compressor.

[0038] Optionally, the first determining module includes:

[0039] The first determining submodule is used to determine the first speed of the air conditioner compressor corresponding to the first cooling mode and the second speed of the air conditioner compressor corresponding to the second cooling mode;

[0040] The second determining submodule is used to determine the first target rotational speed based on the first rotational speed and the second rotational speed.

[0041] Optionally, the first determining submodule is used to:

[0042] When the first cooling mode is the occupant cabin cooling mode, the current ambient temperature, the current sunlight intensity, the actual evaporator temperature, and the temperature change rate of the actual evaporator temperature are obtained.

[0043] The target evaporator temperature of the air conditioner evaporator is determined based on the ambient temperature and the light intensity.

[0044] The first rotational speed is determined based on the target evaporator temperature, the actual evaporator temperature, the ambient temperature, and the rate of temperature change.

[0045] Optionally, the first determining submodule is used to:

[0046] When the first cooling mode is the occupant cabin cooling mode, the average battery temperature, ambient temperature, battery cooling inlet temperature and target inlet temperature corresponding to the battery pack are obtained. The target inlet temperature is determined based on the highest cell temperature of the battery in the battery pack.

[0047] The second initial speed of the air conditioning compressor is determined based on the average battery temperature and the ambient temperature.

[0048] The third compensation speed is determined based on the battery cooling inlet temperature and the target inlet temperature.

[0049] The second rotational speed is determined based on the second initial rotational speed and the third compensated rotational speed.

[0050] Optionally, the device further includes:

[0051] The second determining module is used to determine the third speed of the air conditioning compressor corresponding to the passenger cabin cooling mode if a cooling demand to turn off the battery pack cooling mode is received when the passenger cabin cooling mode and the battery pack cooling mode are turned on. When the passenger cabin cooling mode and the battery pack cooling mode are turned on at the same time, the first switching valve and the second switching valve are in the open state.

[0052] The third adjustment module is used to close the second switching valve on the second refrigeration circuit during the process of reducing the speed of the air conditioner compressor to the third speed.

[0053] Optionally, the device further includes:

[0054] The third determining module is used to determine the fourth speed of the air conditioning compressor corresponding to the battery pack cooling mode and the fourth target opening degree of the second switching valve if a cooling demand to close the passenger compartment cooling mode is received when the passenger compartment cooling mode and the battery pack cooling mode are both turned on. When the passenger compartment cooling mode and the battery pack cooling mode are turned on at the same time, the first switching valve and the second switching valve are in the open state.

[0055] The fourth adjustment module is used to adjust the first switching valve in the first refrigeration circuit to the closed state after the speed of the air conditioner compressor drops to the fourth speed, wherein the opening degree of the second switching valve is adjusted to the fourth target opening degree during the process of the air conditioner compressor speed dropping to the fourth speed.

[0056] Optionally, the device further includes:

[0057] The fourth determining module is used to, in the battery pack cooling mode, if a cooling demand is received indicating that the battery pack cooling mode is turned off and the passenger compartment cooling mode is turned on, determine the fifth speed of the air conditioning compressor corresponding to the passenger compartment cooling mode, then adjust the first switching valve from the closed state to the open state, close the second switching valve, and adjust the speed of the air conditioning compressor to the fifth speed.

[0058] Optionally, the device further includes:

[0059] The fifth determining module is used to determine the sixth speed of the air conditioning compressor corresponding to the battery pack cooling mode when a cooling demand is received in the occupant cabin cooling mode, and after closing the first switching valve and adjusting the second switching valve from the closed state to the open state, adjust the speed of the air conditioning compressor to the sixth speed.

[0060] Optionally, the second adjustment module is used for:

[0061] After adjusting the speed of the air conditioner compressor to the seventh speed according to the first speed change rate, the second switch valve is adjusted from the closed state to the third target opening degree and the second switch valve is kept at the third target opening degree for a first preset time. After the first preset time, the opening degree of the second switch valve is increased from the third target opening degree to the second target opening degree, and the speed of the air conditioner compressor is adjusted to the first target speed according to the second speed change rate.

[0062] The beneficial effects of the technical solutions provided by the embodiments of the present invention include at least the following:

[0063] This invention provides a control method and apparatus for a vehicle cooling system. It allows switching between battery pack cooling mode and passenger compartment cooling mode by adjusting the compressor speed and a switching valve in the cooling circuit. When simultaneously cooling the passenger compartment and battery pack using both modes, the air conditioning compressor speed is determined jointly by both modes. Furthermore, the opening degree of the second switching valve in the second cooling circuit corresponding to the battery pack cooling mode is determined by the first target speed of the air conditioning compressor. This allows for adjustment of the compressor speed and valve opening according to different cooling needs, thereby meeting the cooling requirements of different modes and improving the flexibility and accuracy of the vehicle cooling system. Attached Figure Description

[0064] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1 This is a schematic diagram of the vehicle cooling system involved in the vehicle cooling system control method provided in the embodiments of the present invention;

[0066] Figure 2 This is a flowchart of a control method for a vehicle cooling system provided in an embodiment of the present invention;

[0067] Figure 3 This is a flowchart of another vehicle cooling system control method provided in an embodiment of the present invention;

[0068] Figure 4 This is a flowchart of a method for determining a first rotational speed provided in an embodiment of the present invention;

[0069] Figure 5 This is a flowchart of a method for determining a target evaporator temperature provided by an embodiment of the present invention;

[0070] Figure 6 This is a relation table corresponding to a first correspondence provided in an embodiment of the present invention;

[0071] Figure 7 This is a relation table corresponding to a second correspondence provided in an embodiment of the present invention;

[0072] Figure 8 This is a relation table corresponding to a third correspondence provided in an embodiment of the present invention;

[0073] Figure 9 This is a flowchart of another method for determining the first rotational speed provided in an embodiment of the present invention;

[0074] Figure 10 This is a table showing the correspondence between the target evaporator temperature and the first initial speed of the air conditioning compressor, provided in an embodiment of the present invention.

[0075] Figure 11 This is a correspondence table showing the relationship between the second difference, ambient temperature, and first compensated speed provided in the embodiments of the present invention;

[0076] Figure 12 This is a relation table corresponding to a fourth correspondence provided in an embodiment of the present invention;

[0077] Figure 13 This is a flowchart of a method for determining a second rotational speed provided in an embodiment of the present invention;

[0078] Figure 14 This is a relation table corresponding to a fifth correspondence provided in an embodiment of the present invention;

[0079] Figure 15 This is a relation table corresponding to a sixth correspondence provided in an embodiment of the present invention;

[0080] Figure 16 This is a relationship table corresponding to a seventh correspondence provided in an embodiment of the present invention;

[0081] Figure 17 This is a relation table corresponding to an eighth correspondence provided in an embodiment of the present invention;

[0082] Figure 18 This is a table showing the correspondence between the first rotational speed, the second rotational speed, and the second basic opening degree provided in this embodiment of the invention.

[0083] Figure 19 This is a schematic diagram of the structure of a control device for a vehicle cooling system provided in an embodiment of the present invention. Detailed Implementation

[0084] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0085] Figure 1 This is a schematic diagram of a vehicle cooling system involved in a control method for a vehicle cooling system provided in an embodiment of the present invention. This control method for the cooling system can be applied to a controller. For example... Figure 1 As shown, the cooling system includes: a first refrigeration circuit corresponding to the passenger compartment cooling mode for cooling the passenger compartment and a second refrigeration circuit corresponding to the battery pack cooling mode for cooling the battery pack. The first refrigeration circuit consists of an air conditioning compressor, a condenser, a first switching valve, and an evaporator connected in sequence. The second refrigeration circuit consists of a circuit consisting of an air conditioning compressor, a condenser, a heat exchanger, and a second switch installed in the heat exchanger, and a circuit consisting of a battery pack, a battery water pump, a heat exchanger, and a second switch installed in the heat exchanger. Thus, when the first switching valve is open, the first refrigeration circuit cools the passenger compartment to achieve the purpose of cooling the passenger compartment; when the second switching valve is open, the second refrigeration circuit cools the battery pack to achieve the purpose of cooling the battery pack.

[0086] Please refer to Figure 2 This document illustrates a flowchart of a control method for a vehicle cooling system provided by an embodiment of the present invention. In this embodiment, the control method for the vehicle cooling system is applied to a controller, which controls the system. Figure 1 The equipment shown is part of the vehicle's refrigeration system. (Reference) Figure 2 The method may include:

[0087] Step 201: In the first cooling mode, if a cooling demand corresponding to the second cooling mode is received, determine the first target speed of the air conditioner compressor based on the first cooling mode and the second cooling mode.

[0088] The first target rotation speed is used to meet the cooling requirements corresponding to the first cooling mode and the second cooling mode; the first cooling mode includes one of the crew cabin cooling mode for cooling the crew cabin and the battery pack cooling mode for cooling the battery pack; the second cooling mode includes the other of the crew cabin cooling mode and the battery pack cooling mode.

[0089] Step 202: If the first cooling mode is the battery pack cooling mode, then after adjusting the first switching valve in the first cooling circuit corresponding to the passenger compartment cooling mode from the closed state to the open state, the speed of the air conditioning compressor is adjusted to the first target speed. During the process of adjusting the speed of the air conditioning compressor to the first target speed, the opening degree of the second switching valve in the second cooling circuit corresponding to the battery pack cooling mode is adjusted to the first target opening degree. The second switching valve is in the open state in the battery pack cooling mode, and the first target opening degree is determined according to the first target speed of the air conditioning compressor.

[0090] Step 203: If the first cooling mode is the passenger cabin cooling mode, then during the process of adjusting the speed of the air conditioning compressor to the first target speed, the second switch valve in the second cooling circuit is adjusted from the closed state to the second target opening degree. The first switch valve is in the open state in the passenger cabin cooling mode, and the second target opening degree is determined according to the first target speed of the compressor.

[0091] In summary, the embodiments of the present invention provide a control method for a vehicle cooling system. This method allows switching between battery pack cooling mode and passenger compartment cooling mode by adjusting the compressor speed and the switching valve in the cooling circuit. When simultaneously cooling the passenger compartment and battery pack using both battery pack and passenger compartment cooling modes, the air conditioning compressor speed is determined jointly by both modes. Furthermore, the opening degree of the second switching valve in the second cooling circuit corresponding to the battery pack cooling mode is determined by the first target speed of the air conditioning compressor. This allows for adjustment of the compressor speed and the opening degree of the switching valve according to different cooling needs, thereby meeting the cooling requirements of different modes and improving the flexibility and accuracy of the vehicle cooling system.

[0092] Figure 3 This is a flowchart of another control method for a vehicle cooling system provided in an embodiment of the present invention. This method can be applied to a controller. (Reference) Figure 3 The control method for the vehicle cooling system includes:

[0093] Step 301: In the first cooling mode, if a cooling demand corresponding to the second cooling mode is received, determine the first speed of the air conditioner compressor corresponding to the first cooling mode and determine the second speed of the air conditioner compressor corresponding to the second cooling mode.

[0094] The first cooling mode includes one of a passenger cabin cooling mode for cooling the passenger compartment and a battery pack cooling mode for cooling the battery pack. The second cooling mode includes the other of a passenger cabin cooling mode and a battery pack cooling mode. In one embodiment of the invention, when the first cooling mode includes a passenger cabin cooling mode, the second cooling mode includes a battery pack cooling mode; in another embodiment of the invention, when the first cooling mode includes a battery pack cooling mode, the second cooling mode includes a passenger cabin cooling mode.

[0095] In this invention, the target rotational speed is used to meet the cooling requirements corresponding to the first cooling mode and the second cooling mode. When the first cooling mode is the passenger compartment cooling mode, the cooling requirement corresponding to the first cooling mode is determined based on the ambient temperature outside the vehicle, and the cooling requirement corresponding to the second cooling mode is determined based on the temperature of the battery pack. The specific steps for determining the first rotational speed of the air conditioning compressor corresponding to the first cooling mode and the second rotational speed of the air conditioning compressor corresponding to the second cooling mode are described below.

[0096] like Figure 4 As shown, in one embodiment of the present invention, when the first cooling mode is the passenger cabin cooling mode, the first speed of the air conditioning compressor corresponding to the first cooling mode is determined, including steps 3011-3013:

[0097] Step 3011: Obtain the current ambient temperature, the current sunlight intensity, the actual evaporator temperature, and the temperature change rate of the actual evaporator temperature.

[0098] In one embodiment of the present invention, the current ambient temperature can be obtained by a temperature sensor installed outside the vehicle, and the current light intensity can be determined by a light intensity measuring instrument installed outside the vehicle.

[0099] In one embodiment of the present invention, the temperature change rate of the actual evaporator temperature can be the average of the temperature change rate over a preset time period, or the temperature change rate can be determined based on the actual evaporator temperature at the previous moment, the actual evaporator temperature at the current moment, and the difference between the previous moment and the current moment.

[0100] Step 3012: Determine the target evaporator temperature of the air conditioner evaporator based on the ambient temperature and light intensity.

[0101] In one embodiment of the present invention, such as Figure 5 As shown, the target evaporator temperature of the air conditioner evaporator is determined based on the ambient temperature and light intensity, including steps 30121-30124.

[0102] Step 30121: Determine the target air outlet temperature of the air conditioner based on the ambient temperature, light intensity, and the first correspondence.

[0103] The first correspondence is the relationship between ambient temperature, light intensity, and target air outlet temperature. In one embodiment of this application, the first correspondence can be... Figure 6 The correspondence table can also be the first function corresponding to the ambient temperature, light intensity and target air outlet temperature. For example, the ambient temperature and light intensity are the independent variables of the first function, and the target air outlet temperature is the dependent variable.

[0104] In one embodiment of this application, when it is not possible to... Figure 6 When at least one of the corresponding ambient temperature and light intensity is found, the first function can be used to determine the target air outlet temperature corresponding to that ambient temperature and light intensity.

[0105] Step 30122: Determine the target interior temperature of the vehicle based on the ambient temperature, the initial temperature set by the user, and the second correspondence.

[0106] The second correspondence is the correspondence between the initial temperature, the ambient temperature, and the target vehicle interior temperature. In one embodiment of the present invention, the second correspondence can be... Figure 7 The correspondence table can also be a second function relating ambient temperature, initial temperature, and target vehicle interior temperature. For example, ambient temperature and initial temperature can be used as independent variables of the second function, and target vehicle interior temperature can be used as the dependent variable of the second function.

[0107] Step 30123: Determine the first compensation temperature of the air outlet based on the first difference and the third correspondence between the actual temperature inside the vehicle and the target temperature inside the vehicle.

[0108] In one embodiment of the present invention, the actual temperature inside the vehicle is the temperature inside the passenger compartment collected by a temperature sensor installed inside the vehicle.

[0109] The third correspondence is the correspondence between the first difference and the first compensation temperature, and this correspondence can be... Figure 8 The correspondence table shown can also be obtained through... Figure 8 The corresponding table shown defines the third function between the first difference and the first compensation temperature.

[0110] Step 30124: Compensate the target air outlet temperature based on the first compensation temperature to obtain the target evaporator temperature.

[0111] In one embodiment of the present invention, the target evaporator temperature is obtained by adding the first compensation temperature and the target air outlet temperature.

[0112] Step 3013: Determine the first rotation speed based on the target evaporator temperature, the actual evaporator temperature, the ambient temperature, and the rate of temperature change of the actual evaporator temperature.

[0113] like Figure 9 As shown, in one embodiment of the present invention, determining the first rotational speed based on the target evaporator temperature, the actual evaporator temperature, the ambient temperature, and the temperature change rate of the actual evaporator temperature includes steps 30131-30134.

[0114] Step 30131: Determine the first initial speed of the air conditioning compressor based on the target evaporator temperature.

[0115] In one embodiment of the present invention, the first initial rotational speed corresponding to the target evaporator temperature is determined based on the correspondence between the target evaporator temperature and the first initial rotational speed of the air conditioning compressor. This correspondence can be as follows: Figure 10 The corresponding relationship table is shown.

[0116] Step 30132: Determine the first compensation speed of the air conditioning compressor based on the second difference between the actual evaporator temperature and the target evaporator temperature and the ambient temperature.

[0117] The actual current evaporator temperature can be determined by a temperature sensor installed on the evaporator.

[0118] In one embodiment of the present invention, the first compensation speed is determined based on the correspondence between the second difference, ambient temperature, and the first compensation speed. This correspondence can be as follows: Figure 11 The corresponding relationship table is shown.

[0119] Step 30133: Determine the second compensation speed based on the temperature change rate.

[0120] In one embodiment of the present invention, the second compensation speed is determined according to a fourth correspondence between the temperature change rate and the second compensation speed. This fourth correspondence may be as follows: Figure 12 The corresponding relationship table is shown.

[0121] Step 30134: Determine the first speed based on the first initial speed, the first compensated speed, and the second compensated speed.

[0122] In one embodiment of the present invention, the sum of the first initial rotational speed, the first compensated rotational speed, and the second compensated rotational speed is used as the first rotational speed.

[0123] The first rotational speed is determined through steps 3011-3013 above, and the second rotational speed is determined through steps 3014-3017 below. Steps 3011-3013 can be performed before or after steps 3014-3017. The order in which steps 3011-3013 and steps 3014-3017 are performed can be set according to the actual situation.

[0124] In one embodiment of the present invention, such as Figure 13 As shown, determining the second speed of the air conditioner compressor corresponding to the second cooling mode includes steps 3014-3017:

[0125] Step 3014: Obtain the average battery temperature, ambient temperature, battery cooling inlet temperature and target inlet temperature corresponding to the battery pack.

[0126] In one embodiment of the present invention, the battery pack is a battery group composed of multiple battery cells, and the average temperature of the battery pack is the average temperature of the multiple battery cells in the battery pack.

[0127] The target inlet temperature is determined based on the highest cell temperature of the batteries in the battery pack. In one embodiment of the invention, the target inlet temperature is determined by a fifth correspondence between the highest cell temperature of the individual batteries in the battery pack and the target inlet temperature. This fifth correspondence can be as follows: Figure 14 The corresponding relationship table is shown.

[0128] Step 3015: Determine the second initial speed of the air conditioning compressor based on the average battery temperature and ambient temperature.

[0129] In one embodiment of the present invention, a second initial rotational speed is determined based on a sixth correspondence between the average battery temperature, the ambient temperature, and the second rotational speed of the air conditioning compressor. This sixth correspondence can be as follows: Figure 15 The corresponding relationship table is shown.

[0130] Step 3016: Determine the third compensation speed based on the battery cooling inlet temperature and the target inlet temperature.

[0131] In one embodiment of the present invention, a third difference between the battery cooling inlet temperature and the target inlet temperature is determined. Based on a seventh correspondence between the third difference and the third compensation speed, the third compensation speed corresponding to the third difference is determined. This seventh correspondence can be as follows: Figure 16 The corresponding relationship table is shown.

[0132] Step 3017: Determine the second speed based on the second initial speed and the third compensated speed.

[0133] In one embodiment of the present invention, the sum of the second initial speed and the third compensated speed is used as the second speed.

[0134] Step 302: Determine the target speed based on the first speed and the second speed.

[0135] In one embodiment of the present invention, the sum of the first rotational speed and the second rotational speed is used as the target rotational speed.

[0136] It should be noted that the target speed of the air conditioning compressor in battery pack cooling mode and passenger cabin cooling mode is determined through steps 301-302, and the speed of the air conditioning compressor is adjusted according to the target speed. The specific process of adjusting the speed of the air conditioning compressor will be described below according to different situations.

[0137] The following is an example of switching from battery pack cooling mode to both battery pack cooling mode and passenger cabin cooling mode. For details, please refer to step 303.

[0138] Step 303: If the first cooling mode is the battery pack cooling mode, then after adjusting the first switch valve in the first cooling circuit corresponding to the passenger compartment cooling mode from the closed state to the open state, the speed of the air conditioning compressor is adjusted to the target speed. During the process of adjusting the speed of the air conditioning compressor to the target speed, the opening degree of the second switch valve in the second cooling circuit corresponding to the battery pack cooling mode is adjusted to the first target opening degree.

[0139] In one embodiment of the present invention, in the battery pack cooling mode, the first switching valve is in a closed state, and the second switching valve is in an open state; wherein, the first switching valve is a refrigerant solenoid valve, and the second switching valve is an electronic expansion valve, the first target opening degree of which can be adjusted according to different situations.

[0140] The first target opening degree is determined based on the target speed of the air conditioning compressor. In one embodiment of this application, the corresponding first basic opening degree can be determined according to the correspondence table between the target speed and the first basic opening degree. Then, the first compensation opening degree is determined through the eighth correspondence between the superheat of the refrigerant at the outlet of the second switching valve and the first compensation opening degree. This eighth correspondence is as follows: Figure 17 As shown, the sum of the first basic opening and the first compensated opening is taken as the first target opening.

[0141] In another embodiment of this application, after determining the target speed through the first speed and the second speed, the target speed, the first speed, and the second speed can be stored accordingly, so that the first target opening can be determined based on the first speed and the second speed corresponding to the target speed. Specifically, as shown in the example... Figure 18As shown, the corresponding second basic opening is determined according to the correspondence table of the first speed, the second speed, and the second basic opening. Then, the first compensation opening is determined by the eighth correspondence between the superheat of the refrigerant at the outlet of the second switching valve and the first compensation opening. The sum of the second basic opening and the first compensation opening is taken as the first target opening.

[0142] The superheat of the refrigerant at the outlet of the second switching valve is the difference between the collected refrigerant temperature and the saturation temperature. It is determined by the collected refrigerant temperature and pressure at that time. Specifically, the saturation temperature corresponding to the refrigerant pressure is determined by the correspondence between the refrigerant pressure and the saturation temperature. The difference between the saturation temperature and the collected refrigerant temperature is taken as the superheat of the refrigerant.

[0143] It should be noted that after storing any of the above correspondence tables, a corresponding function relationship will be established based on the correspondence table, so that the value of the corresponding parameter can be found based on the correspondence table or the function relationship.

[0144] The following example illustrates the specific process of switching between battery pack cooling mode and passenger cabin cooling mode.

[0145] In battery pack cooling mode, the second switching valve is open with a certain degree of opening, while the first switching valve is closed. When there is a cooling demand in the passenger compartment, the air conditioning compressor speed needs to increase, requiring the first switching valve to open. Due to the increased compressor speed, the second switching valve's opening degree also needs to increase. To prevent excessive refrigerant pressure during switching, which could cause the compressor to stop, the first switching valve is opened for a second preset time before adjusting the air conditioning compressor speed. The rate of change of the compressor speed is limited to a second target speed within this second preset time. After the second preset time, the speed is adjusted according to a third target speed. The opening degree of the second switching valve is limited to 80% of the first target opening degree within the second preset time, and then adjusted to the first target opening degree after the second preset time. The third target speed is greater than the second target speed. The second preset time, second target speed, and third target speed can be set according to actual conditions. For example, the first preset time can be 5 seconds, the second target speed can be 600 rpm / s, and the third target speed can be 1200 rpm / s.

[0146] The following is an example of switching from the passenger cabin cooling mode to the battery pack cooling mode and the passenger cabin cooling mode. For details, please refer to step 304.

[0147] Step 304: If the first cooling mode is the passenger cabin cooling mode, then during the process of adjusting the speed of the air conditioning compressor to the target speed, the second switch valve in the second cooling circuit is adjusted from the closed state to the second target opening degree.

[0148] In the occupant cabin cooling mode, the first switch valve is in the open state, and the second switch valve is in the closed state.

[0149] In one embodiment of the present invention, during the process of adjusting the speed of the air conditioner compressor to the target speed, adjusting the second switching valve in the second refrigeration circuit from the closed state to the second target opening degree includes:

[0150] After adjusting the air conditioner compressor speed to the seventh speed according to the first speed change rate, the second switch valve is adjusted from the closed state to the third target opening degree and held at the third target opening degree for a first preset time. After the first preset time, the opening degree of the second switch valve is increased from the third target opening degree to the second target opening degree, and the air conditioner compressor speed is adjusted to the first target speed according to the second speed change rate. The first speed change rate, the third target opening degree, the first preset time, the second target opening degree, and the second speed change rate can be set according to actual conditions.

[0151] For example: When cooling a single passenger compartment, the second electronic valve is closed and the first switching valve is open. If the battery requires cooling, the first switching valve needs to be opened and the compressor speed increased; the first switching valve itself does not need to operate. In this situation, the compressor speed needs to be increased slowly first, and then the opening of the second switching valve adjusted. The compressor speed change rate is limited to the first speed change rate. After the compressor speed reaches the seventh speed at this change rate for a third preset time, to ensure a certain battery cooling capacity during the compressor speed change time, the second switching valve is fixed at a third target opening. After the first preset time, the second switching valve operates to the second target opening, and the compressor speed also changes according to the second speed change rate. During the entire switching period, the first switching valve remains open without any change in operation. For example: the first speed change rate is 50 rpm / s; the third preset time is 5 seconds; the second speed change rate is 1200 rpm / s; and the third target opening is half of the second target opening.

[0152] The second target opening degree of the second switching valve is determined based on the first target speed of the compressor. The method for determining the second target opening degree is the same as that for determining the first target opening degree; for details, please refer to the method for determining the first target opening degree, which will not be repeated here.

[0153] After steps 301-304, the system can enter a dual-cooling mode that simultaneously operates in both the passenger cabin cooling mode and the battery pack cooling mode. The following steps will switch the passenger cabin cooling mode and the battery pack cooling mode to other modes. In one embodiment, steps 305-306 will switch the dual-cooling mode to a single-cooling mode of the passenger cabin cooling mode. In another embodiment, steps 307-308 will switch the dual-cooling mode to a single-cooling mode of the battery pack cooling mode.

[0154] Step 305: If the passenger cabin cooling mode and battery pack cooling mode are activated, and a cooling demand to deactivate the battery pack cooling mode is received, then determine the third speed of the air conditioning compressor corresponding to the passenger cabin cooling mode.

[0155] When the occupant cabin cooling mode and the battery pack cooling mode are activated simultaneously, the first and second switching valves are in the open state.

[0156] In the embodiments of this application, when the highest temperature of a single cell in the battery pack is lower than a preset temperature threshold or the average temperature of the battery pack is lower than a preset temperature threshold, the cooling requirement to turn off the battery pack cooling mode can be triggered.

[0157] It should be noted that the method for determining the third speed of the air conditioning compressor corresponding to the passenger compartment cooling mode is the same as the method for determining the first speed of the air conditioning compressor corresponding to the passenger compartment cooling mode. For details, please refer to steps 3011-3013, which will not be repeated here.

[0158] Step 306: During the process of reducing the speed of the air conditioner compressor to the third speed, close the second switch valve on the second refrigeration circuit.

[0159] For example, when switching from simultaneous cooling of the passenger compartment and battery pack to single-passenger compartment cooling, the compressor speed decreases slightly and therefore needs to decrease slowly. The rate of change of compressor speed within 30 seconds is limited to 100 rpm / s. After 30 seconds, the compressor speed decreases and changes to the third speed. During this period, the second switching valve needs to operate at a fixed opening of 80 for 30 seconds and then close after 30 seconds. The first switching valve remains open.

[0160] Step 307: If the passenger compartment cooling mode and the battery pack cooling mode are activated, and a cooling demand to deactivate the passenger compartment cooling mode is received, then determine the fourth speed of the air conditioning compressor corresponding to the battery pack cooling mode and determine the fourth target opening degree of the second switching valve.

[0161] When the occupant cabin cooling mode and the battery pack cooling mode are activated simultaneously, the first and second switching valves are in the open state.

[0162] In the embodiments of this application, the cooling requirement to turn off the crew cabin cooling mode can be controlled by the user by triggering the corresponding off button for the crew cabin cooling.

[0163] It should be noted that the method for determining the fourth speed of the air conditioner compressor corresponding to the battery pack cooling mode is the same as the method for determining the second speed. For details, please refer to steps 3014-3017, which will not be repeated here.

[0164] The fourth target opening degree is determined based on the fourth speed of the air conditioning compressor. In one embodiment of this application, the corresponding third basic opening degree can be determined according to the correspondence table between the fourth speed and the third basic opening degree. Then, the third compensation opening degree is determined by the correspondence between the superheat of the refrigerant at the outlet of the second switching valve and the third compensation opening degree. The sum of the third basic opening degree and the third compensation opening degree is taken as the fourth target opening degree.

[0165] Step 308: After the speed of the air conditioner compressor drops to the fourth speed, the first switching valve in the first refrigeration circuit is adjusted to the closed state. During the process of the air conditioner compressor speed dropping to the fourth speed, the opening degree of the second switching valve is adjusted to the fourth target opening degree.

[0166] For example, when switching from simultaneous cooling of the crew compartment and battery to single-battery pack cooling, the compressor speed drops significantly. Therefore, the compressor speed needs to decrease rapidly, with the rate of change limited to 600 rpm / s within 5 seconds, and then restored to 1200 rpm / s after 5 seconds. After the compressor speed is adjusted to the sixth speed, the first switching valve closes again after 5 seconds. At the same time, during the compressor speed decrease, the opening of the second switching valve is limited to 80% of the fourth target opening within 5 seconds, and then restored to the fourth target opening after 5 seconds.

[0167] It should be noted that after entering the passenger cabin cooling mode through steps 305-306 or the battery pack cooling mode through steps 307-308, the passenger cabin cooling mode and the battery pack cooling mode can be switched under certain conditions.

[0168] In battery pack cooling mode, if a cooling demand is received that the battery pack cooling mode is turned off and the passenger compartment cooling mode is turned on, the fifth speed of the air conditioning compressor corresponding to the passenger compartment cooling mode is determined. Then, the first switch valve is adjusted from the closed state to the open state, the second switch valve is closed, and the speed of the air conditioning compressor is adjusted to the fifth speed.

[0169] It should be noted that the method for determining the fifth speed of the air conditioning compressor corresponding to the passenger compartment cooling mode is the same as the method for determining the first speed of the air conditioning compressor corresponding to the passenger compartment cooling mode. For details, please refer to steps 3011-3013, which will not be repeated here.

[0170] For example, when switching from single battery pack cooling mode to single passenger compartment cooling mode, first open the first switch valve, then close the second switch valve, and finally adjust the compressor to the fifth speed.

[0171] In the passenger compartment cooling mode, if a cooling demand is received that the battery pack cooling mode is turned on and the passenger compartment cooling mode is turned off, the sixth speed of the air conditioning compressor corresponding to the battery pack cooling mode is determined, the first switch valve is closed, and the second switch valve is adjusted from the closed state to the open state, and the speed of the air conditioning compressor is adjusted to the sixth speed.

[0172] During the process of adjusting the air conditioning compressor speed to the sixth speed, the rate of change of the air conditioning compressor speed can be determined according to the temperature inside the passenger compartment. For example, the rate of change of the compressor speed is determined according to the temperature inside the passenger compartment: 100 rpm / s when the temperature inside the passenger compartment is below 32 degrees, 200 rpm / s when the temperature inside the passenger compartment is between 32 and 38 degrees, and 600 rpm / s when the temperature inside the passenger compartment is above 38 degrees. The rate of change of the compressor speed is 1200 rpm / s.

[0173] It should be noted that the method for determining the sixth speed of the air conditioner compressor corresponding to the battery pack cooling mode is the same as the method for determining the second speed. For details, please refer to steps 3014-3017, which will not be repeated here.

[0174] In one embodiment of the present invention, adjusting the second switching valve from a closed state to an open state includes: adjusting the opening degree of the second switching valve to a fifth target opening degree, which is determined based on a sixth rotational speed.

[0175] It should be noted that the method for determining the fifth target opening is the same as that for determining the fourth target opening. The method for determining the fifth target opening can be found in the method for determining the fourth target opening, and will not be repeated here.

[0176] When switching from single-occupant cabin cooling to single-battery cooling, first open the second switch valve to 60% of the fifth target opening, then close the first switch valve, and then adjust the compressor speed to the sixth speed.

[0177] Figure 19 This invention provides a control device for a vehicle cooling system, which may include:

[0178] The first determining module 1901 is used to determine a first target speed of the air conditioning compressor based on the first and second cooling modes when a cooling demand corresponding to the second cooling mode is received in the first cooling mode. The first target speed is used to meet the cooling demand corresponding to the first and second cooling modes. The first cooling mode includes one of a passenger cabin cooling mode for cooling the passenger cabin and a battery pack cooling mode for cooling the battery pack. The second cooling mode includes the other of a passenger cabin cooling mode and a battery pack cooling mode.

[0179] The first adjustment module 1902 is used to adjust the speed of the air conditioning compressor to a first target speed after adjusting the first switching valve in the first refrigeration circuit corresponding to the passenger compartment refrigeration mode from the closed state to the open state if the first refrigeration mode is the battery pack refrigeration mode. In the process of adjusting the speed of the air conditioning compressor to the first target speed, the opening degree of the second switching valve in the second refrigeration circuit corresponding to the battery pack refrigeration mode is adjusted to the first target opening degree. The second switching valve is in the open state in the battery pack refrigeration mode. The first target opening degree is determined according to the first target speed of the air conditioning compressor.

[0180] The second adjustment module 1903 is used to adjust the second switching valve in the second refrigeration circuit from the closed state to the second target opening degree during the process of adjusting the speed of the air conditioning compressor to the first target speed if the first refrigeration mode is the passenger cabin refrigeration mode. The first switching valve is in the open state in the passenger cabin refrigeration mode, and the second target opening degree is determined according to the first target speed of the compressor.

[0181] Optionally, the first determining module 1901 includes:

[0182] The first determining submodule is used to determine the first speed of the air conditioner compressor corresponding to the first cooling mode and to determine the second speed of the air conditioner compressor corresponding to the second cooling mode.

[0183] The second determining submodule is used to determine the first target speed based on the first speed and the second speed.

[0184] Optionally, the first determining submodule is used for:

[0185] When the first cooling mode is the occupant cabin cooling mode, the current ambient temperature, the current sunlight intensity, the actual evaporator temperature, and the temperature change rate of the actual evaporator temperature are obtained.

[0186] Determine the target evaporator temperature of the air conditioner evaporator based on ambient temperature and light intensity;

[0187] The first rotational speed is determined based on the target evaporator temperature, the actual evaporator temperature, the ambient temperature, and the rate of temperature change.

[0188] Optionally, the first determining submodule is used for:

[0189] When the first cooling mode is the crew cabin cooling mode, the average battery temperature, ambient temperature, battery cooling inlet temperature and target inlet temperature in the second cooling circuit are obtained. The target inlet temperature is determined based on the highest cell temperature of the battery in the battery pack.

[0190] The second initial speed of the air conditioning compressor is determined based on the average battery temperature and the ambient temperature.

[0191] The third compensation speed is determined based on the battery cooling inlet temperature and the target inlet temperature.

[0192] The second speed is determined based on the second initial speed and the third compensation speed.

[0193] Optionally, the device also includes:

[0194] The second determining module is used to determine the third speed of the air conditioning compressor corresponding to the passenger compartment cooling mode if a cooling demand to turn off the battery pack cooling mode is received when the passenger compartment cooling mode and the battery pack cooling mode are turned on. When the passenger compartment cooling mode and the battery pack cooling mode are turned on at the same time, the first switching valve and the second switching valve are in the open state.

[0195] The third adjustment module is used to close the second switching valve on the second refrigeration circuit during the process of reducing the speed of the air conditioner compressor to the third speed.

[0196] Optionally, the device also includes:

[0197] The third determining module is used to determine the fourth speed of the air conditioning compressor corresponding to the battery pack cooling mode and the fourth target opening degree of the second switching valve if a cooling demand to close the passenger compartment cooling mode is received when the passenger compartment cooling mode and the battery pack cooling mode are both activated. When the passenger compartment cooling mode and the battery pack cooling mode are activated at the same time, the first switching valve and the second switching valve are in the open state.

[0198] The fourth adjustment module is used to adjust the first switching valve in the first refrigeration circuit to the closed state after the speed of the air conditioner compressor drops to the fourth speed. During the process of the air conditioner compressor speed dropping to the fourth speed, the opening degree of the second switching valve is adjusted to the fourth target opening degree.

[0199] Optionally, the device also includes:

[0200] The fourth determining module is used to determine the fifth speed of the air conditioning compressor corresponding to the passenger compartment cooling mode if a cooling demand is received in the battery pack cooling mode to be turned off and the passenger compartment cooling mode to be turned on. Then, the first switching valve is adjusted from the closed state to the open state, the second switching valve is closed, and the speed of the air conditioning compressor is adjusted to the fifth speed.

[0201] Optionally, the device also includes:

[0202] The fifth determining module is used to determine the sixth speed of the air conditioning compressor corresponding to the battery pack cooling mode when a cooling demand is received in the passenger compartment cooling mode, and the battery pack cooling mode is turned on and the passenger compartment cooling mode is turned off. After closing the first switching valve and adjusting the second switching valve from the closed state to the open state, the speed of the air conditioning compressor is adjusted to the sixth speed.

[0203] Optional, a second adjustment module is used for:

[0204] After adjusting the air conditioner compressor speed to the seventh speed according to the first speed change rate, the second switch valve is adjusted from the closed state to the third target opening degree and the second switch valve is kept at the third target opening degree for a first preset time. After the first preset time, the opening degree of the second switch valve is increased from the third target opening degree to the second target opening degree, and the air conditioner compressor speed is adjusted to the first target speed according to the second speed change rate.

[0205] In summary, the embodiments of the present invention provide a control device for a vehicle cooling system. This device can switch between battery pack cooling mode and passenger compartment cooling mode by adjusting the compressor speed and the switching valve in the cooling circuit. When simultaneously cooling the passenger compartment and battery pack using both battery pack and passenger compartment cooling modes, the air conditioning compressor speed is determined jointly by both modes. Furthermore, the opening degree of the second switching valve in the second cooling circuit corresponding to the battery pack cooling mode is determined by the first target speed of the air conditioning compressor. This allows for adjustment of the compressor speed and the opening degree of the switching valve according to different cooling needs, thereby meeting the cooling requirements of different modes and improving the flexibility and accuracy of the vehicle cooling system.

[0206] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0207] It should be noted that the switching device for the vehicle control system provided in the above embodiments is only an example of the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the vehicle cooling system control device and the vehicle cooling system control method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process can be found in the method embodiments, which will not be repeated here.

[0208] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for a vehicle cooling system, characterized in that, The method includes: In the first cooling mode, if a cooling demand corresponding to the second cooling mode is received, a first target speed of the air conditioning compressor is determined based on the first cooling mode and the second cooling mode. The first target speed is used to meet the cooling demand corresponding to the first cooling mode and the second cooling mode. The first cooling mode includes one of a passenger cabin cooling mode for cooling the passenger cabin and a battery pack cooling mode for cooling the battery pack. The second cooling mode includes the other of the passenger cabin cooling mode and the battery pack cooling mode. If the first cooling mode is the battery pack cooling mode, then after adjusting the first switching valve in the first cooling circuit corresponding to the passenger compartment cooling mode from the closed state to the open state, the speed of the air conditioning compressor is adjusted to the first target speed. During the process of adjusting the speed of the air conditioning compressor to the first target speed, the opening degree of the second switching valve in the second cooling circuit corresponding to the battery pack cooling mode is adjusted to the first target opening degree. The second switching valve is in the open state in the battery pack cooling mode, and the first target opening degree is determined according to the first target speed of the air conditioning compressor. If the first cooling mode is the passenger cabin cooling mode, then during the process of adjusting the speed of the air conditioning compressor to the first target speed, the second switching valve in the second cooling circuit is adjusted from the closed state to the second target opening degree. In the passenger cabin cooling mode, the first switching valve is in the open state, and the second target opening degree is determined according to the first target speed of the compressor. Determining the first target speed of the air conditioner compressor based on the first cooling mode and the second cooling mode includes: Determine the first speed of the air conditioner compressor corresponding to the first cooling mode and determine the second speed of the air conditioner compressor corresponding to the second cooling mode; The first target rotational speed is determined based on the first rotational speed and the second rotational speed; When the first cooling mode is the passenger cabin cooling mode, determining the first speed of the air conditioning compressor corresponding to the first cooling mode includes: Obtain the current ambient temperature, the current sunlight intensity, the actual evaporator temperature, and the rate of temperature change of the actual evaporator temperature; The target air outlet temperature of the air conditioner is determined based on the ambient temperature, the light intensity, and the first correspondence. The target interior temperature of the vehicle is determined based on the ambient temperature, the initial temperature set by the user, and the second correspondence. The first compensation temperature of the air outlet is determined based on the first difference and the third correspondence between the actual temperature inside the vehicle and the target temperature inside the vehicle. The target evaporator temperature is obtained by compensating the target air outlet temperature based on the first compensation temperature. The second compensation speed is determined based on the temperature change rate; the first initial speed of the air conditioning compressor is determined based on the target evaporator temperature; the first compensation speed of the air conditioning compressor is determined based on the second difference between the actual evaporator temperature and the target evaporator temperature and the ambient temperature; the second compensation speed is determined based on the temperature change rate; and the first speed is determined based on the first initial speed, the first compensation speed, and the second compensation speed.

2. The method according to claim 1, characterized in that, When the first cooling mode is the passenger cabin cooling mode, determining the second speed of the air conditioning compressor corresponding to the second cooling mode includes: The average battery temperature, ambient temperature, battery cooling inlet temperature in the second cooling circuit, and target inlet temperature of the battery pack are obtained. The target inlet temperature is determined based on the highest cell temperature of the battery in the battery pack. The second initial speed of the air conditioning compressor is determined based on the average battery temperature and the ambient temperature. The third compensation speed is determined based on the battery cooling inlet temperature and the target inlet temperature. The second rotational speed is determined based on the second initial rotational speed and the third compensated rotational speed.

3. The method according to claim 1, characterized in that, The method further includes: If the passenger cabin cooling mode and the battery pack cooling mode are activated, and a cooling demand to deactivate the battery pack cooling mode is received, then the third speed of the air conditioning compressor corresponding to the passenger cabin cooling mode is determined. When the passenger cabin cooling mode and the battery pack cooling mode are activated simultaneously, the first switch valve and the second switch valve are in the open state. During the process of reducing the speed of the air conditioner compressor to the third speed, the second switching valve on the second refrigeration circuit is closed.

4. The method according to claim 1, characterized in that, The method further includes: If the passenger cabin cooling mode and the battery pack cooling mode are activated, and a cooling demand to deactivate the passenger cabin cooling mode is received, then the fourth speed of the air conditioning compressor corresponding to the battery pack cooling mode is determined and the fourth target opening degree of the second switching valve is determined. When the passenger cabin cooling mode and the battery pack cooling mode are activated simultaneously, the first switching valve and the second switching valve are in the open state. After the speed of the air conditioner compressor drops to the fourth speed, the first switching valve in the first refrigeration circuit is adjusted to the closed state. During the process of the air conditioner compressor speed dropping to the fourth speed, the opening degree of the second switching valve is adjusted to the fourth target opening degree.

5. The method according to claim 1, characterized in that, The method further includes: In battery pack cooling mode, if a cooling demand is received that the battery pack cooling mode is turned off and the passenger compartment cooling mode is turned on, the fifth speed of the air conditioning compressor corresponding to the passenger compartment cooling mode is determined. Then, the first switch valve is adjusted from the closed state to the open state, the second switch valve is closed, and the speed of the air conditioning compressor is adjusted to the fifth speed.

6. The method according to claim 1, characterized in that, The method further includes: In the passenger cabin cooling mode, if a cooling demand is received that the battery pack cooling mode is turned on and the passenger cabin cooling mode is turned off, the sixth speed of the air conditioning compressor corresponding to the battery pack cooling mode is determined, the first switch valve is closed, and the second switch valve is adjusted from the closed state to the open state, and the speed of the air conditioning compressor is adjusted to the sixth speed.

7. The method according to claim 1, characterized in that, The process of adjusting the speed of the air conditioner compressor to the first target speed, including adjusting the second switching valve in the second refrigeration circuit from the closed state to the second target opening degree, includes: After adjusting the speed of the air conditioner compressor to the seventh speed according to the first speed change rate, the second switch valve is adjusted from the closed state to the third target opening degree and the second switch valve is kept at the third target opening degree for a first preset time. After the first preset time, the opening degree of the second switch valve is increased from the third target opening degree to the second target opening degree, and the speed of the air conditioner compressor is adjusted to the first target speed according to the second speed change rate.

8. A control device for a vehicle cooling system, characterized in that, The device includes: The determining module is used to, in the first cooling mode, if a cooling demand corresponding to the second cooling mode is received, determine a first target speed of the air conditioning compressor based on the first cooling mode and the second cooling mode. The first target speed is used to meet the cooling demand corresponding to the first cooling mode and the second cooling mode. The first cooling mode includes one of a passenger cabin cooling mode for cooling the passenger cabin and a battery pack cooling mode for cooling the battery pack. The second cooling mode includes the other of the passenger cabin cooling mode and the battery pack cooling mode. The first adjustment module is used to, if the first cooling mode is the battery pack cooling mode, adjust the first switching valve in the first cooling circuit corresponding to the occupant cabin cooling mode from the closed state to the open state, and then adjust the speed of the air conditioning compressor to the first target speed. In the process of adjusting the speed of the air conditioning compressor to the first target speed, the opening degree of the second switching valve in the second cooling circuit corresponding to the battery pack cooling mode is adjusted to the first target opening degree. The second switching valve is in the open state in the battery pack cooling mode, and the first target opening degree is determined according to the first target speed of the air conditioning compressor. The second adjustment module is used to adjust the second switching valve in the second refrigeration circuit from the closed state to the second target opening degree during the process of adjusting the speed of the air conditioning compressor to the first target speed if the first refrigeration mode is the occupant cabin refrigeration mode. The first switching valve is in the open state in the occupant cabin refrigeration mode, and the second target opening degree is determined according to the first target speed of the compressor. The determining module is configured to: determine a first speed of the air conditioner compressor corresponding to the first cooling mode and determine a second speed of the air conditioner compressor corresponding to the second cooling mode; and determine a first target speed based on the first speed and the second speed. When the first cooling mode is the occupant cabin cooling mode, the determining module is used to: Obtain the current ambient temperature, the current sunlight intensity, the actual evaporator temperature, and the rate of temperature change of the actual evaporator temperature; The target air outlet temperature of the air conditioner is determined based on the ambient temperature, the light intensity, and the first correspondence. The target interior temperature of the vehicle is determined based on the ambient temperature, the initial temperature set by the user, and the second correspondence. The first compensation temperature of the air outlet is determined based on the first difference and the third correspondence between the actual temperature inside the vehicle and the target temperature inside the vehicle. The target evaporator temperature is obtained by compensating the target air outlet temperature based on the first compensation temperature. The second compensation speed is determined based on the temperature change rate; the first initial speed of the air conditioning compressor is determined based on the target evaporator temperature; the first compensation speed of the air conditioning compressor is determined based on the second difference between the actual evaporator temperature and the target evaporator temperature and the ambient temperature; the second compensation speed is determined based on the temperature change rate; and the first speed is determined based on the first initial speed, the first compensation speed, and the second compensation speed.

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