A control system for a parking thermal management system and its control method

Abstract

The present invention discloses a control system and a control method. According to the relationship between the ambient temperature, the required outlet air temperature and the upper limit of the first interval, it further judges the relationship between the required outlet air temperature and the ambient temperature or the second interval, and then selects a suitable working mode of the parking thermal management system according to the relationship between the required outlet air temperature and the ambient temperature or the second interval, so as to be beneficial to reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management control. Background Art

[0002] When the thermal management system works, it consumes energy. Therefore, how to reduce the energy consumption of the thermal management system is a technical problem to be solved. Summary of the Invention

[0003] The purpose of the present invention is to provide a control system and a control method, which are beneficial to reducing energy consumption.

[0004] On the one hand, an embodiment of the present invention provides a control method, which is applied to a control system. The control system can control the operation of the parked vehicle thermal management system. The control method includes:

[0005] Obtain the relationship between the ambient temperature and the upper limit of the first interval, and obtain the relationship between the required outlet air temperature and the upper limit of the first interval; according to the relationship between the ambient temperature, the required outlet air temperature and the upper limit of the first interval, select one of the relationship between the required outlet air temperature and the ambient temperature and the relationship between the required outlet air temperature and the second interval to adjust the working mode of the parked vehicle thermal management system;

[0006] Wherein, the required outlet air temperature is determined by at least one of a set temperature signal and a sunlight signal. The working modes of the parked vehicle thermal management system include: a refrigeration mode, a heating mode, or turning off the compressor of the parked vehicle thermal management system.

[0007] On the other hand, an embodiment of the present invention provides a control system. The control system can control the operation of the parked vehicle thermal management system. The control system can select one of the relationship between the required outlet air temperature and the ambient temperature and the relationship between the required outlet air temperature and the second interval to adjust the working mode of the parked vehicle thermal management system according to the relationship between the ambient temperature, the required outlet air temperature and the upper limit of the first interval;

[0008] Wherein, the required outlet air temperature is determined by at least one of a set temperature signal and a sunlight signal. The working modes of the parked vehicle thermal management system include: a refrigeration mode, a heating mode, or turning off the compressor of the thermal management system.

[0009] Based on the above technical solutions, the control system and the control method provided by the embodiments of the present invention can further determine the relationship between the required outlet air temperature and the ambient temperature or the second interval according to the relationship between the ambient temperature, the required outlet air temperature and the upper limit of the first interval, and select a suitable working mode according to the relationship between the required outlet air temperature and the ambient temperature or the second interval, which is beneficial to reducing the energy consumption of the parked vehicle thermal management system. Description of the Drawings

[0010] Figure 1 It is a schematic connection diagram of a parking thermal management system and a control system;

[0011] Figure 2 It is a schematic diagram of the first control process of the control method for the parking thermal management system;

[0012] Figure 3 It is a schematic diagram of the second control process of the control method for the parking thermal management system;

[0013] Figure 4 It is a schematic diagram of the third control process of the control method for the parking thermal management system;

[0014] Figure 5 It is a schematic diagram of the control process of the circulation mode of the parking thermal management system;

[0015] Figure 6 It is a schematic diagram of the control process of the refrigeration mode. Specific embodiments

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. When the vehicle is running, the compressor of the thermal management system is driven by the engine. When the vehicle is parked, the thermal management system also needs to run to ensure the comfort of the occupants. At this time, if the compressor of the thermal management system is driven by the engine, it will waste energy. For example, a freight vehicle will add another thermal management system for thermal management when the vehicle is parked. The compressor of the parking thermal management system is an electric compressor, which is usually driven by the on-vehicle battery. The control method of the technical solution of the present invention is applicable to the parking thermal management system, and of course, it is also applicable to the thermal management systems of other vehicles, such as cars or vehicles or other devices that require thermal management, which will not be described in detail.

[0017] An embodiment of the technical solution of the present invention provides a control method, which is applied to a control system that can control the operation of the parking thermal management system. This embodiment also provides a control system for the parking thermal management system. Please refer to Figure 1, the parking heat management system includes a compressor 10, a four-way reversing valve 4, a throttle valve 6, a first heat exchanger 20, a second heat exchanger 30, and a circulation air damper 50. The outlet of the compressor 10 can be connected to the first port of the first heat exchanger 20 through the four-way reversing valve 4. The second port of the first heat exchanger 20 can be connected to the first port of the second heat exchanger 30 through the throttle valve 6. The second port of the second heat exchanger 30 is connected to the inlet of the compressor 10 through the four-way reversing valve 4 and a gas-liquid separator 90. In this embodiment, the parking heat management system is applied to a vehicle. The first heat exchanger 20 is disposed in the air-conditioning box of the vehicle for adjusting the temperature of the passenger compartment. The second heat exchanger 30 is disposed outside the air-conditioning box for heat exchange with ambient air. It can be understood that when the heat management system is in heating mode, the first heat exchanger 20 serves as a condenser and the second heat exchanger 30 serves as an evaporator. When the heat management system is in cooling mode, the first heat exchanger 20 serves as an evaporator and the second heat exchanger 30 serves as a condenser. More specifically, the four-way reversing valve 4 includes a first communication port 401, a second communication port 402, a third communication port 403, and a fourth communication port 404. Among them, the outlet of the compressor 10 is connected to the first communication port 401. The second communication port 402 is connected to the first port of the first heat exchanger 20. The second port of the first heat exchanger 20 is connected to the first port of the second heat exchanger 30 through the throttle valve 6. The second port of the second heat exchanger 30 is connected to the third communication port 403. The fourth communication port 404 is connected to the inlet of the compressor 10 through the gas-liquid separator 90. The four-way reversing valve 4 includes a first working state and a second working state. In the first working state of the four-way reversing valve 4, the first communication port 401 is connected to the second communication port 402, and the third communication port 403 is connected to the fourth communication port 404. In the second working state of the four-way reversing valve 4, the first communication port 401 is connected to the third communication port 403, and the second communication port 402 is connected to the fourth communication port 404. When the heat management system executes the heating mode, the four-way reversing valve 4 is in the first working state, that is: the outlet of the compressor 10 is connected to the first port of the first heat exchanger 20. The second port of the first heat exchanger 20 can be connected to the first port of the second heat exchanger 30 through the throttle valve 6. The second port of the second heat exchanger 30 is connected to the inlet of the compressor 10 through the gas-liquid separator 90. When the heat management system executes the cooling mode, the four-way reversing valve 4 is in the second working state. In this embodiment, when the heat management system is in heating mode, the first heat exchanger 20 serves as a condenser and the second heat exchanger 30 serves as an evaporator. Among them, in this embodiment, the first port of the second heat exchanger 30 is the inlet of the evaporator, and the second port of the second heat exchanger is the outlet of the evaporator. Figure 1 The heat management system shown is only a specific form for implementing the technical solution of the present invention. Any heat management system that can achieve heating and cooling in the vehicle interior is applicable to the technical solution of the present invention.

[0018] The control system of the thermal management system includes a controller 100 and a sensor (not shown). The controller 100 is signal-connected to the compressor 10, and the controller 100 can control the state of the compressor 10, such as turning on or off the compressor 10. The controller 10 is signal-connected to the throttle valve 6, and the controller 100 can adjust the opening degree of the throttle valve 6 and the opening and closing of the throttle valve. The controller is signal-connected to the motor that drives the circulation air door to move, and can drive the air door to rotate by controlling the motor to act. The controller 100 is signal-connected to the sensor and can obtain the sensing signal to obtain the corresponding detected quantity. Specifically, the sensor is arranged at the rearview mirror of the vehicle to monitor the ambient temperature. Of course, the first sensor can also be arranged at other positions. When the controller adjusts the circulation air door 50 to close the outside circulation air inlet, the air entering the vehicle interior comes from the ambient air. When the controller adjusts the circulation air door 50 to close the inside circulation air inlet, the air entering the vehicle interior comes from the vehicle interior.

[0019] The controller 100 includes a control circuit. The control circuit at least includes a processing unit 110 and a storage unit 120. The storage unit 120 is used to store relevant parameters, and the processing unit 110 is used for information processing, such as calculation, judgment, and comparison, etc. In this embodiment, the controller 100 includes a driving circuit 130, or rather, the driving circuit 130 and the control circuit are both arranged in the controller 100. In this way, the control circuit outputs a control signal to the driving circuit 130, and the driving circuit 130 generates a corresponding driving signal. At this time, the controller 100 outputs a driving signal to the compressor 10 and the throttle valve 6, so that the compressor 10 and the throttle valve 6 make corresponding actions. In another embodiment, the driving circuit 130 and the control circuit are separately arranged. The controller 100 includes a control circuit, and the driving circuit 130 is integrally arranged with the controlled object, such as being integrally arranged with components such as the compressor 10 and the throttle valve 6, which will not be described in detail.

[0020] The control method of the control system will be introduced below with the parking thermal management system. Below with Figure 1 The control method of the thermal management system will be introduced with the thermal management system shown in the figure. A control method is applied to the control system. The control system can control the operation of the parking thermal management system. Specifically, the operation of the thermal management system includes: the working mode of the thermal management system and the circulation mode of the thermal management system. Among them, the working mode of the thermal management system includes: the heating mode, the cooling mode, or turning off the compressor of the thermal management system. The circulation mode of the thermal management system includes: the inside circulation or the outside circulation. Please refer to Figures 2 - 4 , in the first embodiment of this control method, the control method of the thermal management system includes:

[0021] Judge the relationship between the ambient temperature and the upper limit of the first interval, and judge the relationship between the required outlet air temperature and the upper limit of the first interval; according to the relationship between the ambient temperature, the required outlet air temperature and the upper limit of the first interval, select one of the relationship between the required outlet air temperature and the sum of the ambient temperature and the second interval to adjust the working mode of the thermal management system. Among them, "adjusting the working mode of the thermal management system according to the relationship between the required outlet air temperature and the second interval" includes "adjusting the working mode of the thermal management system according to the relationship between the required outlet air temperature and the upper limit of the second interval" and "adjusting the working mode of the thermal management system according to the relationship between the required outlet air temperature and the lower limit of the second interval". Judgment is a way for the controller to obtain the above relationship. In other embodiments, the above relationship can also be input to the controller as the judgment result of other devices, which will not be described in detail. Among them, the required outlet air temperature is determined by at least one of the set temperature signal and the sunlight signal.

[0022] Judge the relationship between the ambient temperature and the first interval, and judge the relationship between the required outlet air temperature and the first interval; if both the ambient temperature and the required outlet air temperature are less than the upper limit of the first interval, judge the relationship between the ambient temperature and the required outlet air temperature. If the ambient temperature is greater than the required outlet air temperature, the thermal management system executes the refrigeration mode; if the ambient temperature is less than or equal to the required outlet air temperature, turn off the compressor of the thermal management system.

[0023] Among them, the first interval is a set temperature interval (T1, T2). The first interval can be set according to experience, or calculated based on set conditions and operation methods. The upper limit of the first interval is T2, and the lower limit of the first interval is T1. In this embodiment, the first interval is the temperature interval (12°C, 25°C), and of course, it can also be other temperature intervals. The upper limit of the first interval can be a set value or a temperature range, such as fluctuating by 0.5°C around 25°C. The first interval is used to distinguish the range where the ambient temperature and the required outlet air temperature are located. The second interval is a set temperature interval (T3, T4). The second interval can be a set value according to experience, or calculated based on set conditions and operation methods. The upper limit of the second interval is T4, and the lower limit of the first interval is T3. In this embodiment, the first interval is the temperature (28°C, 34°C), and of course, it can also be other temperature intervals. The upper limit of the second interval can be a set value or a temperature range, such as fluctuating by 0.5°C around 34°C, and the lower limit of the second interval is greater than or equal to the upper limit of the first interval. The ambient temperature and the required outlet air temperature are important factors affecting comfort and energy consumption. By establishing a connection between the ambient temperature and the required outlet air temperature through the upper limit of the first interval, based on the relationship between the ambient temperature, the required outlet air temperature and the upper limit of the first interval, further comparing the relationship between the wind temperature and the ambient temperature to judge the working mode of the thermal management system, or further comparing the relationship between the required outlet air temperature and the second interval to judge the working mode of the thermal management system, and selecting an appropriate working mode according to the relationship between the required outlet air temperature and the ambient temperature or the second interval can not only save energy but also improve comfort. The following specifically gives an embodiment. Judge the relationship between the ambient temperature and the upper limit of the first interval, and judge the relationship between the required outlet air temperature and the upper limit of the first interval; when it is determined that the ambient temperature is less than the upper limit of the first interval, if the required outlet air temperature is less than the upper limit of the first interval, adjust the working mode of the thermal management system according to the relationship between the ambient temperature and the required outlet air temperature; if the required outlet air temperature is greater than the upper limit of the first interval, adjust the working mode of the thermal management system according to the relationship between the required outlet air temperature and the upper limit of the second interval; when it is determined that the ambient temperature is greater than the upper limit of the first interval, if the required outlet air temperature is less than the upper limit of the first interval, the thermal management system executes the cooling mode; if the required outlet air temperature is greater than the upper limit of the first interval, adjust the working mode of the thermal management system according to the relationship between the required outlet air temperature and the lower limit of the second interval.

[0024] Furthermore, adjusting the working mode of the thermal management system according to the relationship between the ambient temperature and the required outlet air temperature includes: judging the relationship between the ambient temperature and the required outlet air temperature; if the ambient temperature is greater than the required outlet air temperature, the thermal management system executes the cooling mode; if the ambient temperature is less than or equal to the required outlet air temperature, turn off the compressor of the thermal management system.

[0025] In this way, when the ambient temperature and the required outlet air temperature are within a reasonable range, for example, when both are less than the lower limit of the first interval, the relationship between the ambient temperature and the required outlet air temperature is judged. When the ambient temperature is less than or equal to the required outlet air temperature, the compressor of the thermal management system is turned off, which not only takes into account comfort but also can save energy; instead of directly judging the relationship between the ambient temperature and the required outlet air temperature, this can avoid too large a difference between the ambient temperature and the required outlet air temperature, and can prevent the compressor of the thermal management system from being turned on unnecessarily, wasting energy.

[0026] Please refer to Figure 6 If it is determined that the thermal management system executes the refrigeration mode, the control method further includes: judging the relationship between the ambient temperature or the required outlet air temperature and the lower limit of the first interval. If it is determined that the ambient temperature or the required outlet air temperature is less than the lower limit of the first interval, the thermal management system executes the first refrigeration mode; if it is determined that the ambient temperature or the required outlet air temperature is within the first interval, the thermal management system executes the second refrigeration mode, where the evaporation temperature of the first refrigeration mode is less than the evaporation temperature of the second refrigeration mode. When the thermal management system executes the refrigeration mode, the relationship between the ambient temperature or the required outlet air temperature and the lower limit of the first interval is further judged, and different evaporation temperatures are adopted in different temperature ranges, which can not only improve comfort but also save energy.

[0027] After the controller judges the relationship between the ambient temperature, the required outlet air temperature and the upper limit of the first interval, if it is determined that the ambient temperature is less than the upper limit of the first interval and the required outlet air temperature is greater than the upper limit of the first interval, the controller 100 judges the working mode of the thermal management system according to the relationship between the required outlet air temperature and the second interval. Specifically, if it is determined that the required outlet air temperature is greater than the upper limit of the first interval and less than the upper limit of the second interval, the compressor of the thermal management system is turned off, and the thermal management system executes the external circulation; if it is determined that the required outlet air temperature is greater than the upper limit of the second interval, the thermal management system executes the heating mode, and the thermal management system executes the external circulation. When the required outlet air temperature is greater than the upper limit of the first interval, that is, greater than the ambient temperature, there is still a temperature range to turn off the compressor instead of turning on the compressor for heating to save energy.

[0028] The following content describes the situation where the ambient temperature is greater than the upper limit of the first interval. After the controller 100 determines the relationship between the ambient temperature, the required outlet air temperature, and the first interval, if it is determined that the ambient temperature is greater than the upper limit of the first interval, the controller adjusts the working mode of the thermal management system according to the relationship between the required outlet air temperature and the upper limit of the first interval. Specifically, if it is determined that the required outlet air temperature is less than the upper limit of the first interval, the thermal management system executes the refrigeration mode. At this time, since the ambient temperature is greater than the required outlet air temperature, the thermal management system executes the refrigeration mode to meet the comfort requirements. When the required outlet air temperature is less than the upper limit of the first interval, the relationship between the required outlet air temperature and the lower limit of the first interval can be further determined. If the required outlet air temperature is within the first interval, the thermal management system is adjusted to execute the second refrigeration mode. If the required outlet air temperature is less than the lower limit of the first interval, the thermal management system is adjusted to execute the first refrigeration mode. Similarly, selecting different refrigeration modes according to the relationship between the required outlet air temperature and the lower limit of the first interval is beneficial for energy conservation. Furthermore, the control method also includes the control method for the circulation mode of the thermal management system. The control method for the circulation mode of the thermal management system includes: judging the working mode of the thermal management system and judging the circulation mode according to the working mode of the thermal management system. When the thermal management system executes the refrigeration mode, the thermal management system executes the internal circulation, that is, the circulation damper opens the internal circulation air outlet and closes the external circulation air outlet. This can quickly cool down, which is beneficial for energy conservation.

[0029] If it is determined that the required outlet air temperature is greater than the upper limit of the first interval, the working mode of the thermal management system is adjusted according to the relationship between the required outlet air temperature and the second interval. If it is determined that the required outlet air temperature is less than the lower limit of the second interval, the thermal management system executes the third refrigeration mode. If it is determined that the required outlet air temperature is greater than the lower limit of the second interval, the compressor of the thermal management system is turned off.

[0030] Furthermore, if it is determined that the ambient temperature is greater than the upper limit of the first interval, the control method of the control system further includes the control method of the circulation mode of the thermal management system. Specifically, if the required outlet air temperature is less than the lower limit of the second interval, the thermal management system is in the cooling mode at this time, and the thermal management system executes the internal circulation. The execution of the internal circulation by the thermal management system can quickly cool down and is more conducive to energy conservation. If the required outlet air temperature is greater than the upper limit of the second interval, the thermal management system executes the internal circulation or the external circulation. At this time, the ambient air can be used to reduce the temperature inside the vehicle without turning on the cooling mode, which can also save energy. If the required outlet air temperature is within the second interval, it operates according to the operating mode of the damper in the previous cycle. It should be noted here that: if the thermal management system executed the external circulation in the previous cycle, the thermal management system executes the external circulation this time; if the thermal management system executed the internal circulation in the previous cycle, the thermal management system executes the internal circulation. Generally, when executing the internal circulation, the thermal management system executes the cooling or heating mode. When the required outlet air temperature is within the second interval, continuing the previous damper circulation mode is more conducive to temperature continuity, achieving both energy conservation and comfort.

[0031] Please refer to Figure 5 。In other embodiments, the control system can also independently control the circulation mode of the thermal management system. Specifically, the working mode of the thermal management system is judged, and the circulation mode of the thermal management system is judged according to the working mode of the thermal management system. More specifically, if the thermal management system executes the cooling mode or the heating mode, the thermal management system executes the internal circulation;

[0032] If the compressor of the thermal management system is turned off, the controller judges the relationship between the ambient temperature and the upper limit of the first interval. If the ambient temperature is less than the upper limit of the first interval, the thermal management system executes the external circulation; if the ambient temperature is greater than the upper limit of the first interval, the relationship between the required outlet air temperature and the second interval is judged. If the required outlet air temperature is less than the lower limit of the second interval, the thermal management system executes the internal circulation; if the required outlet air is greater than the upper limit of the second interval, the thermal management system executes the external circulation; if the required outlet air temperature is within the second interval, it operates according to the previous circulation mode of the thermal management system, that is, if the thermal management system executed the internal circulation in the previous cycle, it executes the internal circulation this time; if the thermal management system executed the external circulation in the previous cycle, it executes the external circulation this time.

[0033] It should be noted that: the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify the present invention or make equivalent replacements. All technical solutions and their improvements that do not depart from the spirit and scope of the present invention shall be covered within the scope of the claims of the present invention.

Claims

1. A control method for a parking thermal management system, applied to a control system that can control the operation of the parking thermal management system. The control method includes: Obtaining the relationship between the ambient temperature and the upper limit of the first interval, and obtaining the relationship between the required outlet air temperature and the upper limit of the first interval; Selecting one of the relationship between the required outlet air temperature and the ambient temperature and the relationship between the required outlet air temperature and the second interval according to the relationships between the ambient temperature, the required outlet air temperature and the upper limit of the first interval to adjust the working mode of the parking thermal management system; Wherein, the upper limit of the first interval is less than or equal to the lower limit of the second interval, the required outlet air temperature is determined by at least one of a set temperature signal and a sunlight signal, and the working modes of the parking thermal management system include: a refrigeration mode, a heating mode, or turning off the compressor of the parking thermal management system.

2. The control method according to claim 1, characterized in that If the ambient temperature is less than or equal to the upper limit of the first interval and the required outlet air temperature is less than or equal to the upper limit of the first interval, adjust the working mode of the parking thermal management system according to the relationship between the required outlet air temperature and the ambient temperature; if the ambient temperature is less than or equal to the upper limit of the first interval and the required outlet air temperature is greater than the upper limit of the first interval, adjust the working mode of the parking thermal management system according to the relationship between the required outlet air temperature and the upper limit of the second interval; If the ambient temperature is greater than the upper limit of the first interval and the required outlet air temperature is less than or equal to the upper limit of the first interval, the parking thermal management system executes the refrigeration mode; If the ambient temperature is greater than the upper limit of the first interval and the required outlet air temperature is greater than the upper limit of the first interval, adjust the working mode of the parking thermal management system according to the relationship between the required outlet air temperature and the lower limit of the second interval.

3. The control method according to claim 2, wherein The "adjusting the working mode of the parking thermal management system according to the relationship between the required outlet air temperature and the ambient temperature" includes: Judging the relationship between the ambient temperature and the required outlet air temperature; if the ambient temperature is greater than the required outlet air temperature, the parking thermal management system executes the refrigeration mode; if the ambient temperature is less than or equal to the required outlet air temperature, turn off the compressor of the parking thermal management system.

4. The control method according to claim 1 or 2, characterized in that, "Selecting the relationship between the required outlet air temperature and the second interval to adjust the working mode of the parking thermal management system" includes "adjusting the working mode of the parking thermal management system according to the relationship between the required outlet air temperature and the upper limit of the second interval"; It includes: judging the relationship between the required outlet air temperature and the upper limit of the second interval. If it is determined that the required outlet air temperature is less than the upper limit of the second interval, turn off the compressor of the parking thermal management system; if it is determined that the required outlet air temperature is greater than the upper limit of the second interval, the parking thermal management system executes the heating mode.

5. The control method according to claim 1 or 2, characterized in that "Adjusting the working mode of the parking thermal management system according to the relationship between the required outlet air temperature and the second interval" includes "adjusting the working mode of the parking thermal management system according to the relationship between the required outlet air temperature and the lower limit of the second interval"; including: judging the relationship between the required outlet air temperature and the lower limit of the second interval. If the required outlet air temperature is less than the lower limit of the second interval, the parking thermal management system executes the refrigeration mode. If the required outlet air temperature is greater than the lower limit of the second interval and less than the upper limit of the second interval, the compressor of the parking thermal management system is turned off.

6. The control method according to any one of claims 1-3, characterized in that, If it is determined that the parking thermal management system executes the refrigeration mode, the control method further includes: Judging the relationship between the required outlet air temperature and the first interval. If the required outlet air temperature is less than the lower limit of the first interval, the parking thermal management system executes the first refrigeration mode. If the required outlet air temperature is within the first interval, the parking thermal management system executes the second refrigeration mode. If the required outlet air temperature is greater than the upper limit of the first interval, the parking thermal management system executes the third refrigeration mode; wherein, the evaporation temperature of the first refrigeration mode and the evaporation temperature of the second refrigeration mode are both less than the evaporation temperature of the third refrigeration mode, and the evaporation temperature of the first refrigeration mode is less than the evaporation temperature of the second refrigeration mode.

7. The control method according to claim 1, wherein The control method further includes the control method of the circulation mode of the parking thermal management system. The control method of the circulation mode of the parking thermal management system includes: judging the working mode of the parking thermal management system and controlling the circulation mode of the parking thermal management system according to the working mode of the parking thermal management system; the circulation mode includes internal circulation or external circulation.

8. The control method according to claim 7, wherein If it is determined that the parking thermal management system executes the refrigeration mode or the heating mode, the parking thermal management system executes the internal circulation; If the compressor of the parking thermal management system is turned off, judge the relationship between the ambient temperature and the upper limit of the first interval. If the ambient temperature is less than the upper limit of the first interval, the parking thermal management system executes the external circulation; if the ambient temperature is greater than the upper limit of the first interval, judge the relationship between the required outlet air temperature and the second interval. If the required outlet air temperature is less than the lower limit of the second interval, the parking thermal management system executes the internal circulation. If the required outlet air is greater than the upper limit of the second interval, the parking thermal management system executes the external circulation; if the required outlet air temperature is within the second interval, it runs according to the previous circulation mode of the parking thermal management system.

9. A control system for a parking thermal management system, the control system being capable of controlling the operation of the parking thermal management system, and the control system being capable of selecting one of the relationship between the required outlet air temperature and the ambient temperature and the relationship between the required outlet air temperature and the second interval to adjust the working mode of the parking thermal management system according to the ambient temperature, the required outlet air temperature and the relationship with the upper limit of the first interval; Among them, The upper limit of the first interval is less than or equal to the lower limit of the second interval, and the required outlet air temperature is determined by at least one of the set temperature signal and the sunlight signal. The working modes of the parking thermal management system include: a refrigeration mode, a heating mode, or turning off the compressor of the parking thermal management system.

10. The control system according to claim 9, wherein The control system can control the circulation mode of the parking thermal management system according to the working mode of the parking thermal management system, and the circulation mode includes an internal circulation or an external circulation.

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