Control method for thermal management system and related apparatuses

Abstract

Provided is a control method for a thermal management system. The thermal management system comprises a controller (1200) and a first refrigerant loop, wherein the first refrigerant loop comprises a compressor (101) and a bypass path (102), an outlet of the compressor (101) is in communication with an inlet of the bypass path (102), and an outlet of the bypass path (102) is in communication with an inlet of the compressor (101). Further provided is a thermal management system, wherein a compressor (101) is started to operate at a first rotation speed, such that at least part of a refrigerant that is output from a compressor (101) is re-input into the compressor (101) by means of a bypass path (102); and when the pressure at an inlet of the compressor (101) reaches a first pressure value and / or the temperature at the inlet of the compressor (101) reaches a first temperature value, the rotation speed of the compressor (101) is increased to a second rotation speed. Further provided is a controller (1200), which executes the control method for a thermal management system. Further provided is a vehicle, which comprises the thermal management system, or comprises the controller (1200). By means of such configurations, the normal use of an air-conditioning system in a low-temperature environment can be realized.

Description

Control method and related device of thermal management system

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on March 8, 2024, with application number 202410276768.5, and priority to the Chinese patent application entitled “Control Method and Related Device for Thermal Management System”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of thermal management technology, and in particular to a control method and related devices for a thermal management system. Background Art

[0003] Vehicles are widely used as convenient means of transportation. Air conditioning systems, a crucial component of vehicles, regulate the cabin temperature and provide a comfortable riding environment for passengers. However, in temperatures of -20°C or lower, the coolant temperature and pressure at the compressor inlet are too low, causing the compressor to malfunction and the air conditioning system to become inoperable. Therefore, further research is needed into thermal management in electric vehicles. Summary of the Invention

[0004] The present application provides a control method and related devices for a thermal management system to achieve normal use of an air-conditioning system in a low-temperature environment.

[0005] In a first aspect, the present application provides a control method for a thermal management system, which is applied to a controller of the thermal management system; the aforementioned thermal management system includes a first refrigerant circuit, the aforementioned first refrigerant circuit includes a compressor and a bypass path, the outlet of the aforementioned compressor is connected to the inlet of the aforementioned bypass path, and the outlet of the aforementioned bypass path is connected to the inlet of the aforementioned compressor.

[0006] The above-mentioned method includes a controller controlling the execution of the following operations: starting the above-mentioned compressor to operate at a first speed so that at least part of the refrigerant output from the above-mentioned compressor is re-input into the above-mentioned compressor through the above-mentioned bypass path; when the inlet pressure of the above-mentioned compressor reaches a first pressure value and / or the inlet temperature of the above-mentioned compressor reaches a first temperature value, increasing the speed of the above-mentioned compressor to a second speed.

[0007] In a specific implementation, in a low-temperature environment, the compressor cannot work stably for a long time due to the low inlet temperature and pressure, but it can also be started and run for a short period of time. Based on this, in the above scheme, during this short period of operation, the compressor is first started at a lower speed, and the high-pressure and high-temperature refrigerant output by the compressor is sent back to the inlet of the compressor through a bypass path to increase the temperature and pressure of the refrigerant at the inlet of the compressor, so as to promote the compressor to continue to run at low temperatures. Then, when the inlet pressure or temperature of the compressor reaches a preset value, the speed of the compressor is increased, and the output power of the compressor is increased while further promoting the compressor to continue to run stably, so as to achieve the normal operation of the compressor at low temperatures, and thus achieve the normal use of the air-conditioning system in a low-temperature environment.

[0008] In one possible embodiment, the thermal management system includes a second refrigerant circuit and a first coolant circuit. The second refrigerant circuit includes the refrigerant flow paths of the compressor, condenser, and cooler; the first coolant circuit includes a first water pump and the coolant flow paths of the cooler. The method further includes a controller controlling the following operation: when the temperature difference between the coolant in the first coolant circuit and the inlet temperature of the compressor is greater than a first threshold, activating the first water pump to circulate the coolant in the first coolant circuit.

[0009] In the above solution, the coolant in the first coolant circuit can be driven to circulate, and then the refrigerant in the second refrigerant circuit can be heated through heat exchange in the cooler to further increase the compressor inlet temperature. In other words, in this solution, the existing coolant is used as a heat source, saving the cost of additional heating.

[0010] In one possible embodiment, the first refrigerant circuit further includes a first valve device, the inlet of the first valve device being in communication with the inlet of the bypass path, and the outlet of the first valve device being in communication with the outlet of the bypass path. During the process of increasing the speed of the compressor to the second speed, the method further includes a controller controlling the following operations: if the suction superheat of the compressor is greater than a second temperature value, reducing the opening of the first valve device; if the suction superheat of the compressor is less than a third temperature value, increasing the opening of the first valve device.

[0011] In the above scheme, the opening of the first valve device can be adjusted to adjust the refrigerant flow rate of the bypass path back to the compressor inlet, and then the temperature of the compressor inlet can be adjusted to maintain the balance of the compressor suction superheat to prevent liquid hammer from causing damage to the compressor.

[0012] In one possible embodiment, the thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the second refrigerant circuit includes the refrigerant flow path of the compressor, the condenser, and the refrigerant flow path of the cooler; the third refrigerant circuit includes the refrigerant flow path of the compressor, the condenser, and the evaporator; the thermal management system further includes a second valve device; the second valve device is disposed at the inlet of the refrigerant flow path of the cooler, or at the inlet of the evaporator. In the process of increasing the speed of the compressor to the second speed, the method further includes a controller controlling the following operations: when the suction superheat of the compressor is greater than the second temperature value, increasing the opening of the second valve device; when the suction superheat of the compressor is less than the third temperature value, reducing the opening of the second valve device.

[0013] In the above scheme, the opening of the second valve device can be adjusted to adjust the refrigerant flow rate returning to the compressor inlet in the second refrigerant circuit or the third refrigerant circuit, and then the temperature at the compressor inlet can be adjusted to maintain the balance of the compressor suction superheat to prevent liquid hammer from causing damage to the compressor.

[0014] In one possible embodiment, the thermal management system further includes a gas-liquid separator and a condenser, wherein the gas-liquid separator is provided at the inlet of the compressor; the refrigerant flow channel inlet of the condenser is connected to the outlet of the compressor and the inlet of the bypass path; the first refrigerant circuit further includes a first valve device, wherein the inlet of the first valve device is connected to the inlet of the bypass path, and the outlet of the first valve device is connected to the outlet of the bypass path. In the process of increasing the speed of the compressor to the second speed, the method further includes a controller controlling the following operations: when the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is greater than the fourth temperature value, reducing the opening of the first valve device; when the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is less than the fifth temperature value, increasing the opening of the first valve device.

[0015] In the above scheme, the opening of the first valve device can be adjusted to adjust the refrigerant flow rate of the bypass path returning to the compressor inlet, and then the refrigerant flow rate entering the condenser can be adjusted to maintain the outlet subcooling of the condenser refrigerant flow channel, so as to adjust the performance and stability of the system operation.

[0016] In one possible embodiment, the aforementioned thermal management system further includes a gas-liquid separator, which is arranged at the inlet of the aforementioned compressor; the aforementioned thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the aforementioned second refrigerant circuit includes the aforementioned compressor, the refrigerant flow channel of the condenser and the refrigerant flow channel of the cooler; the aforementioned third refrigerant circuit includes the aforementioned compressor, the refrigerant flow channel of the condenser and the evaporator; the aforementioned thermal management system further includes a second valve device; the aforementioned second valve device is arranged at the inlet of the refrigerant flow channel of the aforementioned cooler, or at the inlet of the aforementioned evaporator. In the aforementioned process of increasing the speed of the aforementioned compressor to the second speed, the aforementioned method further includes a controller controlling the following operations to be performed: when the degree of subcooling at the outlet of the refrigerant flow channel of the aforementioned condenser is greater than the fourth temperature value, increasing the opening of the aforementioned second valve device; when the degree of subcooling at the outlet of the refrigerant flow channel of the aforementioned condenser is less than the fifth temperature value, reducing the opening of the aforementioned second valve device.

[0017] In the above scheme, the opening of the second valve device is adjusted to adjust the refrigerant flow rate flowing into the condenser in the second refrigerant circuit or the third refrigerant circuit, and then the subcooling balance at the outlet of the condenser refrigerant flow channel is adjusted to adjust the performance and stability of the thermal management system.

[0018] In one possible embodiment, the thermal management system further includes a second coolant circuit, comprising a coolant flow path of the condenser, a heater core, and a second water pump. The method further includes a controller controlling the following operation: when the outlet pressure of the compressor reaches a second pressure value and / or the output power of the compressor reaches a first power value, activating the second water pump and operating it at a first duty cycle.

[0019] In the above solution, the second coolant circuit is started only when the compressor can operate stably and can provide a certain amount of heat, so that the coolant in the circuit can obtain heat from the condenser through heat exchange.

[0020] In one possible embodiment, the thermal management system further includes a blower for delivering hot air generated by the heater core; the method further includes a controller controlling the execution of the following operations: increasing the duty cycle of the second water pump to a second duty cycle according to the rotation speed of the compressor and the air volume of the blower.

[0021] In the above solution, the circulation speed of the second coolant circuit is increased by increasing the duty cycle of the second water pump, so as to further obtain heat from the first condenser through heat exchange, and quickly increase the temperature of the coolant in the second coolant circuit.

[0022] In one possible embodiment, the first refrigerant circuit further includes a first valve device, the inlet of the first valve device is connected to the inlet of the bypass path, and the outlet of the first valve device is connected to the outlet of the bypass path. In the process of increasing the duty cycle of the second water pump to the second duty cycle according to the rotation speed of the compressor and the air volume of the blower, the method further includes a controller controlling the following operations: when the outlet pressure of the compressor is less than the third pressure value and the inlet pressure of the compressor is less than the upper limit of the compressor inlet pressure, reducing the opening of the first valve device; when the outlet pressure of the compressor is greater than the fourth pressure value and the inlet pressure of the compressor is less than the lower limit of the compressor inlet pressure, increasing the opening of the first valve device.

[0023] In the above solution, by adjusting the opening of the first valve device, the inlet and outlet pressures of the compressor can be made to meet the preset pressure range, thereby ensuring that the output power of the compressor meets the demand.

[0024] In one possible embodiment, the aforementioned thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the aforementioned second refrigerant circuit includes the aforementioned compressor, the refrigerant flow channel of the condenser and the refrigerant flow channel of the cooler; the aforementioned third refrigerant circuit includes the aforementioned compressor, the refrigerant flow channel of the condenser and the evaporator; the aforementioned thermal management system also includes a second valve device; the aforementioned second valve device is arranged at the refrigerant flow channel inlet of the aforementioned cooler, or at the inlet of the aforementioned evaporator.

[0025] In the process of increasing the duty cycle of the second water pump to the second duty cycle according to the rotational speed of the compressor and the air volume of the blower, the method also includes a controller controlling the execution of the following operations: when the outlet pressure of the compressor is less than the third pressure value and the inlet pressure of the compressor is less than the upper limit value of the inlet pressure of the compressor, reducing the opening of the second valve device; when the outlet pressure of the compressor is greater than the fourth pressure value and the inlet pressure of the compressor is less than the lower limit value of the inlet pressure of the compressor, increasing the opening of the second valve device.

[0026] In the above solution, by adjusting the opening of the second valve device, the inlet and outlet pressures of the compressor can be made to meet the preset pressure range, thereby ensuring that the output power of the compressor meets the demand.

[0027] In one possible embodiment, the thermal management system further includes a blower configured to transport hot air generated by the heater core. The method further includes a controller controlling the following operation: turning on the blower when the coolant temperature in the second coolant circuit reaches a sixth temperature value.

[0028] In the above solution, the blower is turned on only when the coolant in the warm air circuit rises to a certain temperature, thereby avoiding blowing cold air to the user and improving the user experience.

[0029] In one possible embodiment, the thermal management system further includes a third valve device; the inlet of the third valve device is connected to the outlet of the compressor and the inlet of the bypass path. After the second water pump is turned on, the controller further controls the following operation: increasing the opening of the third valve device based on the outlet pressure and temperature of the compressor.

[0030] In the above solution, the third valve assembly is opened slightly before the second water pump is activated, helping to quickly increase the air pressure and temperature at the compressor inlet. After the second water pump is activated, indicating that heating can be provided by the warm air circuit, the third valve assembly is opened wider to increase the flow from the compressor to the condenser, thereby increasing the amount of heat transferred to the warm air circuit.

[0031] In a possible embodiment, the thermal management system further includes a blower, which is used to transport hot air generated by the heater core; before starting the compressor, the method further includes a controller controlling the following operation to be performed: turning on the blower.

[0032] In the above solution, the blower is started before the compressor is started. The sound generated when the blower is working can reduce the noise generated when the compressor is working, reduce the noise in the passenger compartment, and improve the user experience.

[0033] In one possible embodiment, the aforementioned thermal management system is a thermal management system in a vehicle, and before increasing the speed of the aforementioned compressor to the second speed, it also includes: determining the output power of the aforementioned compressor based on the external ambient temperature, the internal temperature of the vehicle and the model size of the aforementioned vehicle; and determining the aforementioned second speed based on the aforementioned output power.

[0034] In the above solution, the output power of the compressor is determined based on the ambient temperature and the size of the vehicle, and the compressor speed is then determined, so that the heating demand of the vehicle can be met while reducing unnecessary power output.

[0035] In a second aspect, the present application provides a thermal management system comprising a controller and a first refrigerant circuit, wherein the first refrigerant circuit comprises a compressor and a bypass path, wherein the outlet of the compressor is connected to the inlet of the bypass path, and the outlet of the bypass path is connected to the inlet of the compressor. The controller is configured to control the following operations: starting the compressor at a first speed so that at least a portion of the refrigerant output from the compressor is re-input into the compressor via the bypass path; and when the inlet pressure of the compressor reaches a first pressure value and / or the inlet temperature of the compressor reaches a first temperature value, increasing the speed of the compressor to a second speed.

[0036] In one possible embodiment, the thermal management system includes a second refrigerant circuit and a first coolant circuit. The second refrigerant circuit includes the refrigerant flow paths of the compressor, condenser, and cooler. The first coolant circuit includes a first water pump and the coolant flow paths of the cooler. The controller is further configured to control the following operation: when the temperature difference between the coolant in the first coolant circuit and the inlet temperature of the compressor is greater than a first threshold, activating the first water pump to circulate the coolant in the first coolant circuit.

[0037] In one possible embodiment, the first refrigerant circuit further includes a first valve device, the inlet of the first valve device being in communication with the inlet of the bypass path, and the outlet of the first valve device being in communication with the outlet of the bypass path. During the process of increasing the speed of the compressor to the second speed, the controller is further configured to control the following operations: if the suction superheat of the compressor is greater than a second temperature value, reducing the opening of the first valve device; and if the suction superheat of the compressor is less than a third temperature value, increasing the opening of the first valve device.

[0038] In one possible embodiment, the thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the second refrigerant circuit includes the refrigerant flow path of the compressor, the condenser, and the refrigerant flow path of the cooler; the third refrigerant circuit includes the refrigerant flow path of the compressor, the condenser, and the evaporator; the thermal management system further includes a second valve device; the second valve device is disposed at the inlet of the refrigerant flow path of the cooler, or at the inlet of the evaporator. In the process of increasing the speed of the compressor to the second speed, the controller is further used to control the execution of the following operations: when the suction superheat of the compressor is greater than the second temperature value, increasing the opening of the second valve device; when the suction superheat of the compressor is less than the third temperature value, reducing the opening of the second valve device.

[0039] In one possible embodiment, the thermal management system further includes a gas-liquid separator and a condenser, wherein the gas-liquid separator is provided at the inlet of the compressor; the refrigerant flow channel inlet of the condenser is connected to the outlet of the compressor and the inlet of the bypass path; the first refrigerant circuit further includes a first valve device, wherein the inlet of the first valve device is connected to the inlet of the bypass path, and the outlet of the first valve device is connected to the outlet of the bypass path. In the process of increasing the speed of the compressor to the second speed, the controller is further used to control the execution of the following operations: when the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is greater than the fourth temperature value, reducing the opening of the first valve device; when the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is less than the fifth temperature value, increasing the opening of the first valve device.

[0040] In one possible embodiment, the aforementioned thermal management system further includes a gas-liquid separator, which is arranged at the inlet of the aforementioned compressor; the aforementioned thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the aforementioned second refrigerant circuit includes the aforementioned compressor, the refrigerant flow channel of the condenser and the refrigerant flow channel of the cooler; the aforementioned third refrigerant circuit includes the aforementioned compressor, the refrigerant flow channel of the condenser and the evaporator; the aforementioned thermal management system further includes a second valve device; the aforementioned second valve device is arranged at the inlet of the refrigerant flow channel of the aforementioned cooler, or at the inlet of the aforementioned evaporator. In the aforementioned process of increasing the speed of the aforementioned compressor to the second speed, the aforementioned controller is also used to control the execution of the following operations: when the degree of subcooling at the outlet of the refrigerant flow channel of the aforementioned condenser is greater than the fourth temperature value, increasing the opening of the aforementioned second valve device; when the degree of subcooling at the outlet of the refrigerant flow channel of the aforementioned condenser is less than the fifth temperature value, reducing the opening of the aforementioned second valve device.

[0041] In one possible embodiment, the thermal management system further includes a second coolant circuit, comprising a coolant flow path of the condenser, a heater core, and a second water pump. The controller is further configured to control the following operation: when the outlet pressure of the compressor reaches a second pressure value and / or the output power of the compressor reaches a first power value, activating the second water pump and operating it at a first duty cycle.

[0042] In one possible embodiment, the thermal management system further includes a blower configured to deliver hot air generated by the heater core. The method further includes increasing the duty cycle of the second water pump to a second duty cycle based on the speed of the compressor and the air volume of the blower.

[0043] In one possible embodiment, the first refrigerant circuit further includes a first valve device, the inlet of the first valve device is connected to the inlet of the bypass path, and the outlet of the first valve device is connected to the outlet of the bypass path. In the process of increasing the duty cycle of the second water pump to the second duty cycle according to the rotation speed of the compressor and the air volume of the blower, the controller is also used to control the execution of the following operations: when the outlet pressure of the compressor is less than the third pressure value and the inlet pressure of the compressor is less than the upper limit value of the inlet pressure of the compressor, the opening of the first valve device is reduced; when the outlet pressure of the compressor is greater than the fourth pressure value and the inlet pressure of the compressor is less than the lower limit value of the inlet pressure of the compressor, the opening of the first valve device is increased.

[0044] In one possible embodiment, the thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the second refrigerant circuit includes the refrigerant flow path of the compressor, the condenser, and the refrigerant flow path of the cooler; the third refrigerant circuit includes the refrigerant flow path of the compressor, the condenser, and the evaporator; the thermal management system also includes a second valve device; the second valve device is arranged at the inlet of the refrigerant flow path of the cooler, or at the inlet of the evaporator. In the process of increasing the duty cycle of the second water pump to the second duty cycle according to the rotation speed of the compressor and the air volume of the blower, the controller is also used to control the following operations: when the outlet pressure of the compressor is less than the third pressure value and the inlet pressure of the compressor is less than the upper limit value of the inlet pressure of the compressor, the opening of the second valve device is reduced; when the outlet pressure of the compressor is greater than the fourth pressure value and the inlet pressure of the compressor is less than the lower limit value of the inlet pressure of the compressor, the opening of the second valve device is increased.

[0045] In one possible embodiment, the thermal management system further includes a blower configured to transport the hot air generated by the heater core. The method further includes: turning on the blower when the coolant temperature of the second coolant circuit reaches a sixth temperature value.

[0046] In one possible embodiment, the thermal management system further includes a third valve device; an inlet of the third valve device is connected to the outlet of the compressor and the inlet of the bypass path. After the second water pump is turned on, the controller is further configured to control the following operation: increasing the opening of the third valve device based on the outlet pressure and temperature of the compressor.

[0047] In a possible embodiment, the thermal management system further includes a blower, which is used to deliver hot air generated by the heater core; before starting the compressor, the controller is further used to control the execution of the following operation: turning on the blower.

[0048] In one possible embodiment, the aforementioned thermal management system is a thermal management system in a vehicle, and before increasing the speed of the aforementioned compressor to the second speed, it also includes: determining the output power of the aforementioned compressor based on the external ambient temperature, the internal temperature of the vehicle and the model size of the aforementioned vehicle; and determining the aforementioned second speed based on the aforementioned output power.

[0049] In a third aspect, the present application provides a controller comprising a processor and a memory, wherein the memory is used to store computer programs or computer instructions, and the processor is used to execute the computer programs or computer instructions stored in the memory, so that the controller executes any method described in the first aspect above.

[0050] In a fourth aspect, the present application provides a vehicle, the vehicle comprising the thermal management system as described in any one of the second aspects above, or the vehicle comprising the controller as described in the third aspect above.

[0051] In a fifth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program or computer instructions, and the computer program or computer instructions are executed by a processor to implement the method described in any one of the first aspects above.

[0052] In a sixth aspect, the present application provides a computer program product. When the aforementioned computer program product is executed by a processor, the method described in any one of the aforementioned first aspects will be implemented.

[0053] The solutions provided in the second to sixth aspects are used to implement or cooperate with the corresponding methods provided in the first aspect, and therefore can achieve the same or corresponding beneficial effects as the corresponding methods in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG1 is a schematic diagram of a partial structure of a thermal management system provided in an embodiment of the present application;

[0055] FIG2 is a schematic diagram of a method flow chart provided in an embodiment of the present application;

[0056] 3 to 11 are partial structural diagrams of a thermal management system provided in an embodiment of the present application;

[0057] FIG12 is a schematic diagram of the structure of the controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] In the embodiment of the present application, "multiple" refers to two or more. In the embodiment of the present application, "and / or" is used to describe the association relationship of associated objects, indicating three relationships that can exist independently. For example, A and / or B can be expressed as follows: A exists alone, B exists alone, or A and B exist at the same time. The description methods such as "at least one of a1, a2, ... and an" used in the embodiment of the present application include the situation where any one of a1, a2, ... and an exists alone, and also include any combination of any multiple of a1, a2, ... and an, each of which can exist alone; for example, the description method of "at least one of a, b and c" includes the situation where a is alone, b is alone, c is alone, a and b combination, a and c combination, b and c combination, or abc combination.

[0059] In this application, the terms "first," "second," and the like are used to distinguish between identical or similar items having substantially the same function or effect. It should be understood that "first," "second," and "nth" do not have a logical or temporal dependency, nor do they limit the quantity or order of execution. It should also be understood that although the following description uses the terms "first," "second," and the like to describe various elements, these elements should not be limited by these terms. These terms are simply used to distinguish one element from another.

[0060] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between the various embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0061] For example, the connection described in the embodiments of the present application refers to the connectivity of the coolant channel or the refrigerant channel, or the connectivity achieved by adjusting the relevant valve device, etc.

[0062] In order to ensure the normal operation of the air-conditioning system in a low-temperature environment, the existing solution is to use a heater to preheat the coolant or refrigerant so that the compressor can operate normally in low-temperature environments. However, the heater is expensive and consumes additional electricity, which reduces the driving range. In order to achieve the normal operation of the air-conditioning system in a low-temperature environment at a low cost, after in-depth analysis, it was found that the compressor can be started and operated briefly even in low-temperature environments. However, due to the low ambient temperature, the temperature and pressure at the compressor inlet are too low, which does not meet the requirements for stable operation of the compressor (for example, the compressor inlet pressure must reach 1 atmosphere and the inlet temperature must be above -20°C). Therefore, the compressor will stop operating after a short period of operation (for example, 1 to 5 minutes), making the compressor unable to operate normally. Based on this, an embodiment of the present application provides a control method for a thermal management system. The control method of the thermal management system can take advantage of the short operating time of the compressor to return the high-temperature and high-pressure refrigerant output by the compressor to the compressor inlet to increase the temperature and pressure of the refrigerant at the compressor inlet, thereby prompting the compressor to continue operating to achieve normal operation of the compressor in low temperatures.

[0063] The embodiments of the present application are applicable to vehicles, and are also applicable to thermal management scenarios with other cooling (heat dissipation) and / or heating requirements. This application is mainly introduced by taking the application scenario of a vehicle as an example. For example, the embodiments of the present application can be applied to traditional fuel vehicles and electric vehicles. Among them, the electric vehicle is a vehicle suitable for driving by an electric drive. The electric vehicle can be a pure electric vehicle (pure electric vehicle / battery electric vehicle, pure EV / battery EV), a hybrid electric vehicle (hybrid electric vehicle, HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV) or a new energy vehicle (NEV), etc.

[0064] Before introducing the control method of the thermal management system provided in the embodiment of the present application, the partial thermal management circuit (including the refrigerant circuit and / or the coolant circuit) included in the thermal management system in the embodiment of the present application is first exemplarily introduced. For ease of understanding, please refer to Figure 1 for example. As shown in Figure 1, the thermal management system of the embodiment of the present application may include a refrigerant circuit L1. The refrigerant circuit L1 may include a compressor 101 and a bypass path 102. Exemplarily, the outlet of the compressor 101 is connected to the inlet of the bypass path 102. The outlet of the bypass path 102 is connected to the inlet of the compressor 101.

[0065] In a specific implementation, the thermal management system of the embodiment of the present application may further include a controller (not shown). The controller may control the opening or closing of the components in the thermal management system, and may also control the opening of the valve device, etc. For example, the controller may send a control instruction to the component or valve device so that the component or valve device performs a corresponding operation according to the control instruction. Thus, various cooling modes, heating modes, or heat dissipation modes may be implemented. This embodiment of the present application will not be described in detail.

[0066] For example, the opening of the valve assembly refers to the size of the opening of the valve in the valve assembly. Specifically, a larger opening indicates a larger opening of the valve, and a greater flow rate can pass through the valve. Conversely, a smaller opening indicates a smaller opening of the valve, and a smaller flow rate can pass through the valve.

[0067] Based on the thermal management system described above, an embodiment of the present application provides a control method for the thermal management system. For example, referring to FIG2 , the method includes but is not limited to the following steps.

[0068] S201 , the controller controls the compressor 101 to start and operate at a first speed, so that at least a portion of the refrigerant output from the compressor 101 is re-input into the compressor 101 through the bypass path 102 .

[0069] In a specific implementation, due to the low ambient temperature, the inlet pressure of the compressor is too low (for example, lower than 1 atmosphere, etc.). This causes the compressor to fail to work properly, and the thermal management system to fail to operate normally. In this case, although the compressor cannot operate normally for a long time, it can be started and run for a short period of time. Based on this, the controller can first control the compressor to start and run the compressor at a lower speed (that is, the first speed mentioned above). So that at least part of the refrigerant output from the compressor 101 is re-input into the compressor 101 through the bypass path 102. Since the refrigerant output from the compressor 101 is high-temperature and high-pressure refrigerant, the high-temperature and high-pressure refrigerant flows back to the compressor 101 through the bypass path 102, which can increase the temperature and pressure of the refrigerant at the inlet of the compressor 101. This prompts the compressor to continue running.

[0070] For example, the first speed can be a pre-set initial speed for the compressor. In one possible implementation, the setting of the initial speed takes into account environmental constraints in scenarios with low temperature and / or pressure. Even if environmental conditions do not meet the requirements for stable operation of the compressor, the compressor can start and operate at the initial speed for a period of time. The embodiments of this application do not limit the specific value and method for obtaining the first speed.

[0071] Illustratively, the bypass path 102 may be a pipeline or a flow channel integrated on a substrate, etc., and the embodiment of the present application does not impose any limitation on this.

[0072] S202 : When the inlet pressure of the compressor 101 reaches a first pressure value and / or the inlet temperature of the compressor 101 reaches a first temperature value, the controller controls the compressor 101 to increase the speed to a second speed.

[0073] In a specific implementation, after the high-temperature and high-pressure refrigerant output by the compressor 101 is diverted back to the inlet of the compressor 101 through the bypass path 102, the pressure and temperature at the inlet of the compressor 101 will gradually increase. When the inlet pressure of the compressor 101 reaches a first pressure value, or when the inlet temperature of the compressor 101 reaches a first temperature value, or when both are met, the controller can send a control instruction to the compressor 101 to increase the speed of the compressor 101 to a second speed. This increases the output power of the compressor 101 while further promoting the continued stable operation of the compressor, thereby achieving normal operation of the compressor 101 at low temperatures.

[0074] For example, the first pressure value or the first temperature value may be pre-set, and the embodiment of the present application does not impose any limitation on this.

[0075] For example, in one possible implementation, the inlet pressure of the compressor 101 and the inlet temperature of the compressor 101 have the following corresponding relationship: inlet temperature = saturation temperature corresponding to the inlet pressure + suction superheat. Specifically, the saturation temperature corresponding to the inlet pressure can be obtained by looking up a table when the inlet pressure is known, and this will not be described in detail here. For an introduction to the suction superheat, please refer to the subsequent related introduction, which will not be described in detail here. Based on this, it can be seen that when the suction superheat remains stable, the inlet pressure is determined, and the inlet temperature is also determined accordingly. Therefore, for example, this corresponding relationship also exists between the first pressure value and the first temperature value.

[0076] In one possible implementation, the thermal management system may be a thermal management system in a vehicle. The value of the second speed may be determined based on the required output power of the compressor 101. The required output power may be determined based on the ambient temperature outside the vehicle, the temperature inside the vehicle, and the model size of the vehicle. For example, a mapping relationship table of the ambient temperature outside the vehicle, the temperature inside the vehicle, and the model size of the vehicle with the required output power may be pre-configured. The required output power may be determined by looking up the table. For example, in a specific implementation, a temperature sensor may be provided on the vehicle to detect the ambient temperature outside the vehicle and the temperature inside the vehicle. The controller may obtain the ambient temperature outside the vehicle and the temperature inside the vehicle detected by the temperature sensor. The model size of the vehicle is also pre-configured and may be obtained by the controller. Then, the controller performs a table lookup based on the obtained ambient temperature outside the vehicle, the temperature inside the vehicle, and the model size of the vehicle to obtain the required output power.

[0077] In addition, a mapping table of the required output power and the speed of the compressor 101 can be pre-configured. By looking up the table, the second speed corresponding to the required output power can be determined. Alternatively, these mapping tables can be omitted and the required output power and / or the second speed can be calculated using a corresponding calculation method. This embodiment of the present application does not impose any restrictions on this.

[0078] In another possible implementation, if the thermal management system is not limited to a thermal management system in a vehicle, but can also be a thermal management system in other devices or environments, the second speed can be directly preset without the need for table lookup or calculation. Of course, the second speed is greater than the first speed.

[0079] It is understood that the above description of the second speed is merely an example and does not limit the embodiments of the present application. The embodiments of the present application do not limit the specific value and acquisition method of the second speed.

[0080] In another possible implementation, after the controller controls the compressor 101 to increase its speed to the second speed, it may further control the compressor 101 to increase its speed to a third speed to meet a higher output power requirement. The third speed is greater than the second speed. It is understood that the controller may adjust the compressor speed one or more times based on the required compressor output power, and this embodiment of the application does not limit the adjustment of the compressor speed.

[0081] In one possible implementation, as shown in Figure 3, the thermal management system further includes a refrigerant circuit L2 and a coolant circuit L3. The refrigerant circuit L2 includes the refrigerant flow path of the compressor 101, the condenser 103, and the refrigerant flow path of the cooler 104. The coolant circuit L3 includes a water pump 106 and the coolant flow path of the cooler 104.

[0082] As shown in Figure 3, d 11 Indicates the inlet of the refrigerant flow channel of the condenser 103, d 12 Indicates the outlet of the refrigerant flow channel of the condenser 103. In addition, the condenser 103 also includes a coolant flow channel. 13 represents the inlet of the coolant flow channel of the condenser 103, d 14 Indicates the outlet of the coolant flow channel of the condenser 103. 21 represents the inlet of the refrigerant flow channel of the cooler 104, d 22 represents the outlet of the refrigerant flow channel of the cooler 104, d 23 represents the inlet of the coolant flow channel of the cooler 104, d 24It represents the outlet of the coolant flow channel of the cooler 104. The connection relationship between the various components in the refrigerant circuit L2 and the coolant circuit L3 can be exemplified in FIG3 and will not be described in detail here.

[0083] For example, as shown in FIG3 , the thermal management system may further include a valve device 105. The valve device 105 may be provided at the inlet of the cooler 104. Specifically, the inlet of the valve device 105 is connected to the outlet of the condenser 103. 12 The outlet of the valve device 105 is connected to the inlet of the refrigerant flow channel of the cooler 104. 21 connection. Exemplarily, the valve device 105 can adjust the opening. The valve device 105 can be, for example, an expansion valve, etc. Alternatively, the valve device 105 can be a valve with a switching function, for example, a shut-off valve (SOV), etc. It can be understood that the description of the type of valve device 105 here is only an example and does not constitute a limitation on the embodiments of the present application. Exemplarily, the valve device 105 can cool down and reduce the pressure of the high-temperature and high-pressure liquid refrigerant from the condenser 103, and output low-temperature and low-pressure refrigerant to the cooler 104. In addition, the valve device 105 also has the function of adjusting the flow rate.

[0084] Exemplarily, as shown in FIG3 , the coolant circuit L3 may further include a target device 107. The target device 107 may, for example, include one or more of the following: an electric drive, a battery, and a radiator. The electric drive is a device that drives the vehicle. The electric drive may, for example, include a power distribution unit (PDU), a microcontroller unit (MCU), a modular drivetrain concept (MDC), an electric drive unit (EDU), or a motor. The coolant circuit L3 may, for example, be a heat dissipation circuit for the target device 107.

[0085] In a specific implementation, if the inlet pressure and temperature of the compressor 101 are too low before or after starting the compressor 101, for example, lower than the temperature of the coolant in the coolant circuit L3, the coolant circuit L3 can be activated to exchange heat with the refrigerant in the refrigerant circuit L2, thereby increasing the temperature of the refrigerant in the refrigerant circuit L2 and thereby raising the inlet pressure and temperature of the compressor 101.

[0086] For example, in a specific implementation, a temperature sensor monitors the temperature of the coolant in the coolant circuit L3. The monitored temperature is then compared with the compressor inlet temperature. When the temperature difference between the temperature of the coolant in the coolant circuit L3 and the inlet temperature of the compressor 101 is greater than a first threshold, the water pump 106 is started to drive the coolant circulation in the coolant circuit L3. This achieves heat exchange with the refrigerant in the refrigerant circuit L2. For example, the value of the first threshold can be, for example, greater than or equal to zero, which is not limited in this embodiment of the present application.

[0087] In one possible implementation, in FIG3 , before starting the compressor 101, the controller may first control the opening of the valve device 105 to be adjusted to an initial opening. This allows the refrigerant circulation in the refrigerant circuit L2 to be opened after the compressor 101 is started, and the refrigerant is returned to the inlet of the compressor 101 according to a certain initial flow rate. It is understood that the initial opening may be a preset opening or an opening calculated according to a certain algorithm. The embodiment of the present application does not limit the specific value and acquisition method of the initial opening.

[0088] In a possible implementation, please refer to Figure 4 for example. In Figure 4, the refrigerant circuit L1 may also include a valve device 108. The inlet of the valve device 108 is connected to the inlet of the bypass path 102, and the outlet of the valve device 108 is connected to the outlet of the bypass path 102. For example, the valve device 108 can adjust the opening. The valve device 108 can be, for example, an expansion valve, etc. Alternatively, the valve device 108 can be a valve with a switching function, for example, a shut-off valve (SOV), etc. It will be understood that the description of the type of valve device 108 here is only an example and does not constitute a limitation on the embodiments of the present application. The valve device 108 is provided in the bypass path 102, and the flow rate and / or pressure of the refrigerant sent back to the inlet of the compressor 101 can be controlled by adjusting the valve device 108.

[0089] For example, in one possible implementation, in FIG4 , before starting the compressor 101, the controller may first control the opening of the valve device 108 to be adjusted to an initial opening. This allows the refrigerant circulation in the refrigerant circuit L1 to be opened after the compressor 101 is started, and the high-temperature and high-pressure refrigerant output by the compressor 101 is directed back to the inlet of the compressor 101 according to a certain initial flow rate. It is understood that the initial opening may be a preset opening or an opening calculated according to a certain algorithm. The embodiment of the present application does not limit the specific value and acquisition method of the initial opening.

[0090] In one possible implementation, see Figure 5 for an example. The thermal management system may further include a refrigerant circuit L4. Refrigerant circuit L4 may include a compressor 101, a refrigerant flow path of a condenser 103, an evaporator 109, and a valve device 110. The valve device 110 is disposed at the inlet of the evaporator 109. The connection relationship between the various components in the refrigerant circuit L4 can be seen in Figure 5 for an example, and will not be described in detail here.

[0091] Exemplarily, the valve device 110 can adjust its opening. The valve device 110 can be, for example, an expansion valve. Alternatively, the valve device 110 can be a valve with an on / off function, such as a stop valve. It will be understood that the description of the types of valve devices 110 herein is merely illustrative and does not constitute a limitation on the embodiments of the present application. The valve device 110 can be used to cool and reduce the pressure of the high-temperature, high-pressure liquid refrigerant from the condenser 103, obtaining a low-temperature, low-pressure refrigerant that is input into the evaporator 109. In addition, the valve device 110 can also adjust the flow rate.

[0092] For example, in one possible implementation, in FIG5 , before starting the compressor 101, the controller may first control the opening of the valve device 110 to be adjusted to an initial opening. This allows the refrigerant circulation in the refrigerant circuit L4 to be opened after the compressor 101 is started, and the refrigerant is returned to the inlet of the compressor 101 according to a certain initial flow rate. It is understood that the initial opening may be a preset opening or an opening calculated according to a certain algorithm. The embodiment of the present application does not limit the specific value and acquisition method of the initial opening.

[0093] For example, in one possible implementation, for the case where the refrigerant circuit L1 includes a valve device 108, such as the case shown in Figure 4 or Figure 5 above, the suction superheat balance of the compressor 101 can be maintained by adjusting the opening of the valve device 108. The suction superheat of the compressor 101 refers to the difference between the temperature of the gas sucked into the compressor 101 and the saturation temperature corresponding to the pressure of the suction gas. Too much or too little suction superheat will affect the performance and stability of the compressor 101, for example, problems such as liquid hammer or excessive exhaust temperature may occur. Therefore, the suction superheat is generally controlled within a certain range. For example, the suction superheat of the compressor = the saturation temperature corresponding to the compressor suction temperature (i.e., inlet temperature) - the suction pressure (i.e., inlet pressure).

[0094] For example, during the process of increasing the speed of the compressor 101 to the second speed, the opening of the valve device 108 can be adjusted to adjust the suction superheat of the compressor 101. For example, it is assumed that the suction superheat of the compressor 101 is preferably maintained within a range less than the second temperature value and greater than the third temperature value. For example, the second and third temperature values ​​can be pre-set or determined based on the actual operating requirements of the compressor 101, which is not limited in this embodiment of the present application. Therefore, during the process of increasing the speed of the compressor 101 to the second speed, the controller can obtain the suction superheat of the compressor 101. For example, after measuring the temperature and pressure at the inlet of the compressor 101 using a temperature sensor and a pressure sensor, the saturation temperature corresponding to the pressure is determined by looking up a table. Then, the suction superheat of the compressor 101 is calculated based on the above-mentioned compressor suction superheat calculation formula. The calculated suction superheat of the compressor 101 is then compared with the above-mentioned second and third temperature values.

[0095] For example, when the suction superheat of the compressor 101 is greater than the second temperature value, the controller can control the valve device 108 to open more, thereby reducing the high-temperature, high-pressure refrigerant flowing back to the inlet of the compressor 101, thereby reducing the temperature rise rate at the inlet of the compressor 101. When the suction superheat of the compressor 101 is less than the third temperature value, the controller can control the valve device 108 to open more, thereby increasing the high-temperature, high-pressure refrigerant flowing back to the inlet of the compressor 101, thereby increasing the temperature rise rate at the inlet of the compressor 101. Specifically, by adjusting the opening of the valve device 108, the refrigerant flow rate flowing back to the inlet of the compressor 101 through the bypass path 102 is adjusted, thereby adjusting the temperature at the inlet of the compressor 101 to maintain a balanced suction superheat of the compressor 101, thereby preventing liquid hammer from causing damage to the compressor 101.

[0096] For example, in one possible implementation, when the refrigerant circuit L2 includes a valve device 105, such as in the situations shown in Figures 3, 4, or 5, the opening of the valve device 105 can be adjusted to maintain a balanced suction superheat of the compressor 101. For example, during the process of increasing the speed of the compressor 101 to the second speed, the opening of the valve device 105 can be adjusted to adjust the suction superheat of the compressor 101. Similarly, assuming that the suction superheat of the compressor 101 is preferably maintained within a range below a second temperature value and above a third temperature value, the controller compares the calculated suction superheat of the compressor 101 with the second and third temperature values. If the suction superheat of the compressor 101 is greater than the second temperature value, the controller can control the opening of the valve device 105 to increase. This increases the amount of low-temperature, low-pressure refrigerant returning to the inlet of the compressor 101, thereby reducing the refrigerant temperature at the inlet of the compressor 101. If the suction superheat of compressor 101 is less than the third temperature value, the controller can control the opening of valve device 105 to decrease. This reduces the amount of low-temperature, low-pressure refrigerant returning to the inlet of compressor 101, thereby increasing the refrigerant temperature at the inlet of compressor 101. Specifically, by adjusting the opening of valve device 105, the refrigerant flow rate returning to the inlet of compressor 101 in refrigerant circuit L2 is adjusted, thereby adjusting the temperature at the inlet of compressor 101 to maintain a balanced suction superheat of compressor 101 and prevent liquid hammer from causing damage to compressor 101.

[0097] For example, in one possible implementation, for the refrigerant circuit L4 described above, such as the situation shown in FIG5 , the opening of the valve device 110 can be adjusted to maintain a balanced intake superheat of the compressor 101. For example, during the process of increasing the speed of the compressor 101 to the second speed, the opening of the valve device 110 can be adjusted to adjust the intake superheat of the compressor 101. Similarly, assuming that the intake superheat of the compressor 101 is preferably maintained within a range below a second temperature value and above a third temperature value, the controller compares the calculated intake superheat of the compressor 101 with the second and third temperature values. If the intake superheat of the compressor 101 is greater than the second temperature value, the controller can control the opening of the valve device 110 to increase. This increases the amount of low-temperature, low-pressure refrigerant returning to the inlet of the compressor 101, thereby reducing the refrigerant temperature at the inlet of the compressor 101. If the intake superheat of the compressor 101 is less than the third temperature value, the controller can control the opening of the valve device 110 to decrease. This reduces the amount of low-temperature, low-pressure refrigerant flowing back to the inlet of the compressor 101, thereby increasing the refrigerant temperature at the inlet of the compressor 101. Specifically, by adjusting the opening of the valve device 110, the refrigerant flow rate in the refrigerant circuit L4 flowing back to the inlet of the compressor 101 is adjusted, thereby adjusting the temperature at the inlet of the compressor 101 to maintain the suction superheat balance of the compressor 101, thereby preventing liquid hammer from causing damage to the compressor 101.

[0098] In a possible implementation, if the thermal management system further includes a gas-liquid separator, the gas-liquid separator is provided at the inlet of the compressor 101. For ease of understanding, please refer to FIG6 for example, FIG6 is shown in conjunction with FIG5 as an example, and FIG3 and FIG4 are similar and will not be described in detail. In FIG6, the outlet of the gas-liquid separator is connected to the inlet of the compressor 101. The outlet of the gas-liquid separator is connected to the outlet of the valve device 108 and the outlet of the refrigerant flow channel of the cooler 104. 22 , and the outlet of the evaporator 109 is connected. In this case, during the process of increasing the speed of the compressor 101 to the second speed, the opening of one or more of the valve device 108, the valve device 105, and the valve device 110 can be adjusted based on the subcooling degree to maintain the subcooling balance of the condenser 103.

[0099] Exemplarily, the subcooling degree at the outlet of the condenser 103 refers to the difference between the refrigerant saturation temperature corresponding to the outlet pressure of the refrigerant flow channel of the condenser 103 and the refrigerant temperature at the outlet of the refrigerant flow channel of the condenser 103. Excessive or insufficient subcooling will affect the performance and stability of the thermal management system. Therefore, the subcooling degree should generally be controlled within a certain range. Exemplarily, subcooling degree = saturation temperature corresponding to the outlet pressure of the refrigerant flow channel of the condenser 103 - refrigerant temperature at the outlet of the refrigerant flow channel of the condenser 103. If there is no pressure sensor at the outlet of the refrigerant flow channel of the condenser, the outlet pressure of the refrigerant flow channel of the condenser in the above formula can be approximately replaced by the exhaust pressure of the compressor 101.

[0100] For example, it is assumed that the degree of supercooling at the outlet of the refrigerant flow channel of the condenser 103 is maintained in a range of less than the fourth temperature value and greater than the fifth temperature value. For example, the fourth temperature value and the fifth temperature value may be pre-set, or may be determined according to the actual working requirements of the thermal management system, and the embodiment of the present application does not limit this. Then, in the process of increasing the speed of the compressor 101 to the second speed, the controller can obtain the degree of supercooling at the outlet of the refrigerant flow channel of the condenser 103 in real time. And compare the degree of supercooling at the outlet of the refrigerant flow channel of the condenser 103 with the above-mentioned fourth temperature value and the fifth temperature value.

[0101] In one possible implementation, when the degree of subcooling at the outlet of the refrigerant flow passage of condenser 103 is greater than a fourth temperature value, the controller may control the opening of valve device 108 to decrease. This reduces the amount of high-temperature, high-pressure refrigerant flowing back to the inlet of compressor 101, thereby reducing the degree of subcooling at the outlet of the refrigerant flow passage of condenser 103. When the degree of subcooling at the outlet of the refrigerant flow passage of condenser 103 is less than a fifth temperature value, the controller may control the opening of valve device 108 to increase. This increases the amount of high-temperature, high-pressure refrigerant flowing back to the inlet of compressor 101, thereby increasing the degree of subcooling at the outlet of the refrigerant flow passage of condenser 103. Specifically, by adjusting the opening of valve device 108, the flow rate of refrigerant flowing back from bypass path 102 to the inlet of compressor 101 is adjusted, thereby adjusting the flow rate of refrigerant entering condenser 103 to maintain the degree of subcooling at the outlet of the refrigerant flow passage of condenser 103, thereby adjusting the performance and stability of system operation.

[0102] In another possible implementation, if the outlet subcooling of the refrigerant flow channel of the condenser 103 is greater than the fourth temperature value, the controller can control the opening of the valve device 105 to increase. This increases the refrigerant flowing into the condenser 103, thereby reducing the subcooling of the outlet of the refrigerant flow channel of the condenser 103. If the outlet subcooling of the refrigerant flow channel of the condenser 103 is less than the fifth temperature value, the controller can control the opening of the valve device 105 to decrease. This reduces the refrigerant flowing into the condenser 103, thereby increasing the subcooling of the outlet of the condenser 103. Specifically, by adjusting the opening of the valve device 105, the refrigerant flow rate flowing into the condenser 103 in the refrigerant circuit L2 is adjusted, and then the subcooling balance of the outlet of the refrigerant flow channel of the condenser 103 is adjusted to adjust the performance and stability of the thermal management system.

[0103] In another possible implementation, if the outlet subcooling of the condenser 103 is greater than the fourth temperature value, the controller can control the opening of the valve device 110 to increase. In order to increase the refrigerant flowing into the condenser 103, thereby reducing the outlet subcooling of the refrigerant flow channel of the condenser 103. If the outlet subcooling of the refrigerant flow channel of the condenser 103 is less than the fifth temperature value, the controller can control the opening of the valve device 110 to decrease. In order to reduce the refrigerant flowing into the condenser 103, thereby increasing the outlet subcooling of the refrigerant flow channel of the condenser 103. Specifically, by adjusting the opening of the valve device 110, the refrigerant flow rate passing through the condenser 103 in the refrigerant circuit L4 is adjusted, and then the subcooling of the outlet of the condenser 103 is adjusted to adjust the performance and stability of the thermal management system.

[0104] In a possible implementation, the thermal management system may further include a coolant circuit L5. For ease of understanding, please refer to FIG7 for example. FIG7 is taken as an example in combination with FIG5 above, and the same applies to FIG3 and FIG4 , which will not be described in detail. As shown in FIG7 , the coolant circuit L5 includes a coolant flow channel of the condenser 103, a heater core 111 and a water pump 112. For example, in a specific implementation, the water pump 112 is generally closed during the above process. Until the compressor 101 is turned on, when the outlet pressure of the compressor 101 reaches the second pressure value, or the output power of the compressor 101 reaches the first power value, or both of these conditions are met, the controller can control the water pump 112 to turn on, and control the water pump 112 to operate at a first duty cycle. After the water pump 112 is turned on, it can drive the coolant circulation in the coolant circuit L5, and increase the temperature of the coolant through heat exchange with the condenser 103.

[0105] For example, a water pump's duty cycle refers to the proportion of a high level signal within a signal cycle. For example, during a continuous period of actual operation, the water pump's high level accumulates for a duration, and its low level accumulates for b durations, and so on. Therefore, the water pump's duty cycle is a / (a+b). For example, a water pump's duty cycle is typically expressed as a percentage.

[0106] For example, the second pressure value and the first power value may be pre-configured or further determined based on the operating requirements of the compressor 101, and this embodiment of the present application does not limit this. Similarly, the first duty cycle may be pre-set or determined based on actual operating requirements, and this embodiment of the present application does not limit this.

[0107] In the above solution, when the outlet pressure of compressor 101 reaches the second pressure value or the output power of compressor 101 reaches the first power value, it indicates that compressor 101 is operating stably and can provide a certain amount of heat. Based on this, coolant loop L5 is activated, allowing the coolant in this loop to obtain heat from condenser 103 through heat exchange, preparing for subsequent heating.

[0108] In one possible implementation, the first duty cycle is the initial duty cycle of the water pump 112. As the operation of the compressor 101 becomes more and more stable, the duty cycle of the water pump 112 can be increased to a second duty cycle. Specifically, the duty cycle of the water pump 112 can be adjusted according to the speed of the compressor 101. For example, in one possible implementation, a mapping relationship table of the speed of the compressor 101 and the duty cycle of the water pump 112 can be pre-configured. When the speed of the compressor 101 reaches a preset speed, the duty cycle corresponding to the preset speed, i.e., the second duty cycle, can be obtained by looking up the table. Then, the controller controls the water pump 112 to operate at the second duty cycle.

[0109] In one possible implementation, in the process of increasing the duty cycle of the water pump 112 to the second duty cycle, it is also necessary to ensure that the inlet and outlet pressures of the compressor 101 are maintained within a certain preset range so as to meet the output power requirement of the compressor 101. For example, in a specific implementation, the compressor 101 has an inlet pressure upper limit and an inlet pressure lower limit. The compressor 101 can only work normally when the inlet pressure is within this range. The controller can maintain the inlet and outlet pressure balance of the compressor 101 by adjusting the opening of one or more of the valve device 108, the valve device 105 and the valve device 110. For ease of understanding, take the valve device 108 as an example.

[0110] For example, while increasing the duty cycle of water pump 112 to the second duty cycle, the controller may obtain the outlet pressure and inlet pressure of compressor 101. When the outlet pressure of compressor 101 is less than the third pressure value and the inlet pressure of compressor 101 is less than the upper limit of the inlet pressure of compressor 101, the controller controls the valve device 108 to decrease its opening. This allows the outlet pressure of compressor 101 to gradually increase, thereby meeting the output power requirement. When the outlet pressure of compressor 101 is greater than the fourth pressure value and the inlet pressure of compressor 101 is less than the lower limit of the inlet pressure of compressor 101, the controller controls the valve device 108 to increase its opening. This allows the inlet pressure of compressor 101 to gradually increase, thereby meeting the output power requirement.

[0111] For example, the fourth pressure value is greater than or equal to the third pressure value. The third and fourth pressure values ​​may be preset or determined according to actual application needs, and this embodiment of the present application does not limit this.

[0112] Similarly, in another possible implementation, in the process of increasing the duty cycle of the water pump 112 to the second duty cycle, the controller can obtain the outlet pressure and inlet pressure of the compressor 101. When the outlet pressure of the compressor 101 is less than the third pressure value and the inlet pressure of the compressor 101 is less than the upper limit of the inlet pressure of the compressor 101, the controller controls to reduce the opening of the valve device 105. This allows the outlet pressure of the compressor 101 to gradually increase and meet the output power requirement. When the outlet pressure of the compressor 101 is greater than the fourth pressure value and the inlet pressure of the compressor 101 is less than the lower limit of the inlet pressure of the compressor 101, the controller controls to increase the opening of the valve device 105. This allows the inlet pressure of the compressor 101 to gradually increase and meet the output power requirement.

[0113] Similarly, in another possible implementation, in the process of increasing the duty cycle of the water pump 112 to the second duty cycle, the controller can obtain the outlet pressure and inlet pressure of the compressor 101. When the outlet pressure of the compressor 101 is less than the third pressure value, and the inlet pressure of the compressor 101 is less than the upper limit of the inlet pressure of the compressor 101, the controller controls to reduce the opening of the valve device 110. So that the outlet pressure of the compressor 101 gradually increases to meet the output power requirement. When the outlet pressure of the compressor 101 is greater than the fourth pressure value, and the inlet pressure of the compressor 101 is less than the lower limit of the inlet pressure of the compressor 101, the controller controls to increase the opening of the valve device 110. So that the inlet pressure of the compressor 101 gradually increases to meet the output power requirement.

[0114] In one possible implementation, the thermal management system further includes a blower (not shown). The blower can be used to deliver hot air generated by the warm air core 111. For example, in a specific implementation, the blower is generally turned off during the above process. After the circulation of the coolant loop L5 is turned on for heat exchange, when the coolant temperature of the coolant loop L5 reaches a sixth temperature value, the controller can control the blower to turn on. In order to deliver hot air to the user for heating. For example, the sixth temperature value can be pre-set, or can be actually determined according to actual application requirements or user instructions, and the embodiments of the present application do not limit this.

[0115] In another possible implementation, please refer to Figure 8 for example. Figure 8 is shown in combination with Figure 7 as an example, and Figures 3 to 6 are the same, so they are not described one by one. The above-mentioned thermal management system also includes a valve device 113. The inlet of the valve device 113 is connected to the outlet of the compressor 101 and the inlet of the bypass path 102. The outlet of the valve device 113 is also connected to the inlet of the refrigerant channel of the condenser 103. Exemplarily, the valve device 113 can adjust the opening. The valve device 113 can be, for example, an expansion valve. The pressure of the refrigerant sent back to the inlet of the compressor 101 can be increased by reducing the opening of the valve device 113, so that the pressure at the inlet of the compressor 101 can be quickly increased. In addition, the valve device 113 also has the function of adjusting the flow rate.

[0116] For example, in one possible implementation, in FIG8 , before starting the compressor 101, the controller may first control the opening of the valve device 113 to be adjusted to an initial opening. This allows the refrigerant circulation in the refrigerant circuit L2 or the refrigerant circuit L4 to be opened after the compressor 101 is started, and the refrigerant output by the compressor 101 is directed back to the inlet of the compressor 101 according to a certain initial flow rate. It is understandable that the initial opening may be a preset opening or an opening calculated according to a certain algorithm. The embodiment of the present application does not limit the specific value and acquisition method of the initial opening.

[0117] In one possible implementation, if the thermal management system includes the valve device 113, the coolant circuit L5, and the blower, for example, refer to the thermal management system shown in FIG8 . Then, the controller can control the blower to be turned on before starting the compressor 101. The noise of the compressor is masked by the sound generated by the blower when it is working. Alternatively, in another possible implementation, even if the valve device 113 is included, the controller can control the blower to be turned on when the coolant temperature of the coolant circuit L5 reaches the sixth temperature value. The specific method of turning on the blower can be determined according to actual needs, and the embodiment of the present application does not impose any restrictions on this.

[0118] In one possible implementation, if the controller turns on the blower before controlling the start of the compressor 101, then the second duty cycle can be determined based on the rotational speed of the compressor 101 and the air volume of the blower. For example, in one possible implementation, a mapping relationship table between the rotational speed of the compressor 101, the air volume of the blower, and the duty cycle of the water pump 112 can be pre-configured. When the rotational speed of the compressor 101 reaches the preset speed, the air volume of the blower is obtained for table lookup. Thus, the duty cycle corresponding to the preset speed and air volume, i.e., the second duty cycle, can be obtained. Then, the controller controls the water pump 112 to operate at the second duty cycle.

[0119] In a possible implementation, if the thermal management system includes the valve device 113 and the coolant loop L5, after the circulation heat exchange of the coolant loop L5 is turned on, the controller can control the increase of the opening of the valve device 113. Specifically, the opening of the valve device 113 can be increased according to the outlet pressure and outlet temperature of the compressor 101. For example, a mapping relationship table between the outlet pressure and outlet temperature of the compressor 101 and the opening size of the valve device 113 can be pre-set. When the outlet pressure and outlet temperature of the compressor 101 reach the preset value, the corresponding opening size of the valve device 113 is obtained by looking up the table. Alternatively, the corresponding opening size of the valve device 113 can be calculated based on the outlet pressure and outlet temperature of the compressor 101 according to a preset calculation formula. The embodiment of the present application does not limit this. Then, the controller controls the increase of the opening size of the valve device 113 based on the obtained corresponding opening size of the valve device 113.

[0120] In the above solution, the valve device 113 is opened slightly before the water pump 112 is turned on, helping to quickly increase the pressure and temperature at the inlet of the compressor 101. After the water pump 112 is turned on, it indicates that heating can be provided through the warm air circuit (i.e., the coolant circuit L5). Therefore, the opening of the valve device 113 can be increased. This increases the flow rate from the compressor 101 to the condenser 103, thereby increasing the amount of heat transferred to the warm air circuit.

[0121] In another possible implementation, as exemplified in FIG9 , the condenser 103 is replaced with an air-cooled condenser instead of the water-cooled condenser. Furthermore, in FIG9 , the thermal management system may further include a condenser 114 and a valve device 115 . The condenser 114 may, for example, be an air-cooled condenser, which can be used for heating (e.g., heating the passenger compartment of a vehicle). For example, in this implementation, after the compressor 101 is turned on, and when the outlet pressure of the compressor 101 reaches a second pressure value, or the output power of the compressor 101 reaches a first power value, or both, the controller controls the operation of turning on the water pump 112 by increasing the opening of the valve device 115 and turning on the condenser 114. The high-temperature, high-pressure refrigerant output by the compressor 101 can then be input into the condenser 114 for heat exchange, thereby heating the air in the passenger compartment to provide heating for the passenger compartment. The refrigerant output from the condenser 114 after heat exchange may flow back to the compressor 101 via the evaporator 109 and / or the cooler 104 .

[0122] The existing heater core heating method uses the high-temperature refrigerant output by the compressor to transfer heat to the coolant, which then flows to the heater core to heat the air to heat the passenger compartment. This requires secondary heating and reduces heat exchange efficiency. In the above solution, the air is directly heated by the air-cooled condenser to heat the passenger compartment, which improves heat exchange efficiency and heat utilization.

[0123] It is understood that the above description mainly uses the example of activating the thermal management system to provide heating to a user in a low-temperature environment. In a specific implementation, after activating the thermal management system in a low-temperature environment, it can also be used to heat the vehicle's power battery, for example. Alternatively, the thermal management system can also be used for cooling or dissipating heat from the target device. These functions are not further described in the present embodiment.

[0124] Furthermore, it should be understood that the components included in the various refrigerant circuits or coolant circuits described above are merely examples. In specific implementations, these circuits may include more or fewer components, specifically increasing or decreasing them based on actual application requirements. This is not a limitation of the present application. For ease of understanding, please refer to Figures 10 or 11 for illustrative purposes.

[0125] As shown in FIG10 , the thermal management system may further include a nine-way valve 116, a battery 117, an electric driver 118, a radiator 119, a water pump 120, a water pump 121, a one-way valve 122, a three-way valve 123, and a kettle 124. The nine-way valve 116 includes nine interfaces, as shown in FIG10 , 1 to 9 represent the nine interfaces. The three-way valve 123 includes three interfaces, wherein the three interfaces are represented as d 51 d 52 and d 53. The connection relationship between the nine-way valve 116, battery 117, electric driver 118, radiator 119, water pump 120, water pump 121, one-way valve 122, three-way valve 123 and kettle 124 in the thermal management system is shown in Figure 10 and will not be described in detail. In a specific implementation, the controller can control the connectivity and closure of each interface of the nine-way valve 116. By controlling the connectivity of the interfaces in the nine-way valve 116, various cooling modes, heating modes or heat dissipation modes can be achieved. For example, by controlling the connectivity of the interfaces in the nine-way valve 116, the above-mentioned coolant circuit L3 can be realized. The embodiments of the present application will not be described in detail one by one.

[0126] As shown in Figure 11, the above-mentioned thermal management system may also include a five-way valve 126, a four-way valve 125, a battery 117, an electric driver 118, a radiator 119, a water pump 120, a water pump 121, a three-way valve 127, a kettle 124 and a kettle 128. Among them, the five-way valve 126 includes five interfaces. The four-way valve 125 includes four interfaces. The three-way valve 127 includes three interfaces. The connection relationship between the five-way valve 126, the four-way valve 125, the battery 117, the electric driver 118, the radiator 119, the water pump 120, the water pump 121, the three-way valve 127, the kettle 124 and the kettle 128 in the thermal management system is shown in Figure 11 and is not described one by one. In a specific implementation, the above-mentioned controller can control the connection and closing of each interface of the five-way valve 126 and the four-way valve 125. By controlling the connectivity between the ports in the five-way valve 126 and the four-way valve 125, various cooling, heating, or cooling modes can be achieved. For example, by controlling the connectivity between the ports in the five-way valve 126 and the four-way valve 125, the aforementioned coolant circuit L3 can be implemented. This embodiment of the present application does not elaborate on this in detail.

[0127] It is understood that the above-mentioned Figures 10 and 11 are merely examples and do not constitute a limitation on the embodiments of the present application. In specific implementations, there are other thermal management systems that include the various circuits described above and apply the methods described above.

[0128] In summary, since the compressor can also be started and operated briefly in a low-temperature environment, in the above scheme, during this brief operation period, the compressor is first started at a lower speed, and the high-pressure and high-temperature refrigerant output by the compressor is returned to the compressor inlet through a bypass path to increase the temperature and pressure of the refrigerant at the compressor inlet, thereby prompting the compressor to continue to operate at low temperatures. Then, when the compressor inlet pressure or temperature reaches a preset value, the compressor speed is increased, the compressor output power is increased, and the compressor is further prompted to continue to operate stably, so as to achieve normal operation of the compressor at low temperatures, and thus achieve normal use of the air-conditioning system in low-temperature environments.

[0129] In one possible implementation, an embodiment of the present application further provides a controller. Figure 12 shows a schematic diagram of a possible hardware structure of a controller provided by the present application, which can be the controller in the method described in the above embodiment. Controller 1200 shown in Figure 12 may include: a processor 1201, a memory 1202, and a communication interface 1203. Processor 1201, communication interface 1203, and memory 1202 may be interconnected or connected to each other via a bus 1204.

[0130] Exemplarily, the memory 1202 is used to store computer programs and data of the controller 1200. The memory 1202 may include, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or portable read-only memory (CD-ROM).

[0131] The software or program codes required for the functions of all or part of the units of the controller in the above method embodiment are stored in the memory 1202 .

[0132] In one possible implementation, if the software or program code required for the functions of some units is stored in the memory 1202, the processor 1201, in addition to calling the program code in the memory 1202 to implement some functions, can also cooperate with other components (such as the communication interface 1203) to jointly complete other functions described in the method embodiment (such as the function of receiving or sending data or instructions).

[0133] There may be multiple communication interfaces 1203 , which are used to support the controller 1200 to communicate, such as receiving or sending data, signals, or instructions.

[0134] Exemplarily, processor 1201 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array, or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. A processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. Processor 1201 may be configured to read programs stored in memory 1202 and execute the operations performed by the controller in the method described in FIG. 2 and its possible embodiments.

[0135] The specific operations and beneficial effects of each unit in the controller 1200 shown in Figure 12 can be found in the corresponding description in the above method embodiment, and will not be repeated here.

[0136] An embodiment of the present application also provides a vehicle, which includes the controller described in any of the above embodiments or the thermal management system in any of the above possible embodiments.

[0137] An embodiment of the present application further provides a computer-readable storage medium storing a computer program, which is executed by a processor to implement operations performed by a controller in any one of the above-mentioned embodiments and possible embodiments thereof.

[0138] An embodiment of the present application further provides a computer program product. When the computer program product is read and executed by a computer, the operations performed by the controller of any one of the above-mentioned embodiments and possible embodiments thereof will be executed.

[0139] It should be understood that in the various embodiments of the present application, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0140] It will also be understood that the term “comprise” (also known as “includes,” “including,” “comprises,” and / or “comprising”) when used in this specification specifies the presence of stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0141] It should also be understood that references throughout this specification to "one embodiment," "an embodiment," or "one possible implementation" mean that specific features, structures, or characteristics associated with that embodiment or implementation are included in at least one embodiment of the present application. Therefore, the appearance of "in one embodiment," "in an embodiment," or "one possible implementation" throughout this specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method for a thermal management system, characterized in that: The method is applied to a controller of a thermal management system; the thermal management system includes a first refrigerant circuit, the first refrigerant circuit includes a compressor and a bypass path, the outlet of the compressor is connected to the inlet of the bypass path, and the outlet of the bypass path is connected to the inlet of the compressor; the method includes the controller controlling the following operations to be performed: Starting the compressor to operate at a first speed so that at least a portion of the refrigerant output from the compressor is re-input into the compressor through the bypass path; When the inlet pressure of the compressor reaches a first pressure value and / or the inlet temperature of the compressor reaches a first temperature value, the rotational speed of the compressor is increased to a second rotational speed.

2. The method according to claim 1, characterized in that The thermal management system includes a second refrigerant circuit and a first coolant circuit, the second refrigerant circuit including the compressor, the refrigerant flow path of the condenser, and the refrigerant flow path of the cooler; the first coolant circuit including a first water pump and the coolant flow path of the cooler; the method further includes the controller controlling the following operations to be performed: When a temperature difference between the temperature of the coolant in the first coolant circuit and the inlet temperature of the compressor is greater than a first threshold, the first water pump is started to drive the coolant circulation in the first coolant circuit.

3. The method according to claim 1 or 2, characterized in that The first refrigerant circuit further includes a first valve device, wherein an inlet of the first valve device is communicated with an inlet of the bypass path, and an outlet of the first valve device is communicated with an outlet of the bypass path; During the process of increasing the speed of the compressor to the second speed, the method further includes the controller controlling the following operations to be performed: When the suction superheat of the compressor is greater than a second temperature value, reducing the opening of the first valve device; When the suction superheat of the compressor is less than a third temperature value, the opening degree of the first valve device is increased.

4. The method according to any one of claims 1 to 3, characterized in that The thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the second refrigerant circuit includes the refrigerant flow passages of the compressor, the condenser, and the cooler; the third refrigerant circuit includes the refrigerant flow passages of the compressor, the condenser, and the evaporator; the thermal management system also includes a second valve device; the second valve device is arranged at the refrigerant flow passage inlet of the cooler or at the evaporator inlet; During the process of increasing the speed of the compressor to the second speed, the method further includes the controller controlling the following operations to be performed: When the suction superheat of the compressor is greater than a second temperature value, increasing the opening of the second valve device; When the suction superheat of the compressor is less than a third temperature value, the opening degree of the second valve device is reduced.

5. The method according to any one of claims 1 to 4, characterized in that The thermal management system further includes a gas-liquid separator and a condenser, the gas-liquid separator being disposed at the inlet of the compressor; the refrigerant flow channel inlet of the condenser being in communication with the outlet of the compressor and the inlet of the bypass path; the first refrigerant circuit further includes a first valve device, the inlet of the first valve device being in communication with the inlet of the bypass path, and the outlet of the first valve device being in communication with the outlet of the bypass path; During the process of increasing the speed of the compressor to the second speed, the method further includes the controller controlling the following operations to be performed: When the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is greater than a fourth temperature value, reducing the opening of the first valve device; When the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is less than a fifth temperature value, the opening degree of the first valve device is increased.

6. The method according to any one of claims 1 to 5, characterized in that The thermal management system further includes a gas-liquid separator, which is arranged at the inlet of the compressor; the thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the second refrigerant circuit includes the refrigerant flow channel of the compressor, the condenser, and the refrigerant flow channel of the cooler; the third refrigerant circuit includes the refrigerant flow channel of the compressor, the condenser, and the evaporator; the thermal management system further includes a second valve device; the second valve device is arranged at the inlet of the refrigerant flow channel of the cooler, or at the inlet of the evaporator; During the process of increasing the speed of the compressor to the second speed, the method further includes the controller controlling the following operations to be performed: When the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is greater than a fourth temperature value, increasing the opening of the second valve device; When the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is less than a fifth temperature value, the opening degree of the second valve device is reduced.

7. The method according to any one of claims 1 to 6, characterized in that The thermal management system further includes a second coolant circuit, the second coolant circuit including a coolant flow channel of the condenser, a heater core, and a second water pump; the method further includes the controller controlling the following operations to be performed: When the outlet pressure of the compressor reaches a second pressure value and / or the output power of the compressor reaches a first power value, the second water pump is turned on and operates at a first duty cycle.

8. The method according to claim 7, characterized in that The first refrigerant circuit further includes a first valve device, wherein an inlet of the first valve device is communicated with an inlet of the bypass path, and an outlet of the first valve device is communicated with an outlet of the bypass path; In the process of increasing the duty cycle of the second water pump to a second duty cycle according to the rotation speed of the compressor and the air volume of the blower, the method further includes the controller controlling the following operations to be performed: When the outlet pressure of the compressor is less than a third pressure value and the inlet pressure of the compressor is less than an upper limit of the compressor inlet pressure, reducing the opening of the first valve device; When the outlet pressure of the compressor is greater than the fourth pressure value and the inlet pressure of the compressor is less than the compressor inlet pressure lower limit value, the opening degree of the first valve device is increased.

9. The method according to claim 8, characterized in that The thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the second refrigerant circuit includes the refrigerant flow passages of the compressor, the condenser, and the cooler; the third refrigerant circuit includes the refrigerant flow passages of the compressor, the condenser, and the evaporator; the thermal management system also includes a second valve device; the second valve device is arranged at the refrigerant flow passage inlet of the cooler or at the evaporator inlet; In the process of increasing the duty cycle of the second water pump to a second duty cycle according to the rotation speed of the compressor and the air volume of the blower, the method further includes the controller controlling the following operations to be performed: When the outlet pressure of the compressor is less than a third pressure value and the inlet pressure of the compressor is less than an upper limit of the compressor inlet pressure, reducing the opening of the second valve device; When the outlet pressure of the compressor is greater than the fourth pressure value and the inlet pressure of the compressor is less than the compressor inlet pressure lower limit value, the opening degree of the second valve device is increased.

10. The method according to any one of claims 7 to 9, characterized in that: The thermal management system further includes a third valve device; an inlet of the third valve device is connected to the outlet of the compressor and the inlet of the bypass path; After the second water pump is turned on, the controller controls the following operations to be performed: The opening degree of the third valve device is increased according to the outlet pressure and temperature of the compressor.

11. The method according to claim 10, characterized in that The thermal management system further includes a blower for delivering hot air generated by the heater core; before starting the compressor, the method further includes the controller controlling the following operation to be performed: turning on the blower.

12. A thermal management system, characterized in that: The thermal management system includes a controller and a first refrigerant circuit, wherein the first refrigerant circuit includes a compressor and a bypass path, wherein the outlet of the compressor is connected to the inlet of the bypass path, and the outlet of the bypass path is connected to the inlet of the compressor; the controller is used to control the execution of the following operations: Starting the compressor to operate at a first speed so that at least a portion of the refrigerant output from the compressor is re-input into the compressor through the bypass path; When the inlet pressure of the compressor reaches a first pressure value and / or the inlet temperature of the compressor reaches a first temperature value, the rotational speed of the compressor is increased to a second rotational speed.

13. The thermal management system according to claim 12, wherein: The thermal management system includes a second refrigerant circuit and a first coolant circuit, wherein the second refrigerant circuit includes the compressor, the refrigerant flow channel of the condenser, and the refrigerant flow channel of the cooler; the first coolant circuit includes a first water pump and the coolant flow channel of the cooler; and the controller is further configured to control the execution of the following operations: When a temperature difference between the temperature of the coolant in the first coolant circuit and the inlet temperature of the compressor is greater than a first threshold, the first water pump is started to drive the coolant circulation in the first coolant circuit.

14. The thermal management system according to claim 12 or 13, characterized in that: The first refrigerant circuit further includes a first valve device, wherein an inlet of the first valve device is communicated with an inlet of the bypass path, and an outlet of the first valve device is communicated with an outlet of the bypass path; During the process of increasing the speed of the compressor to the second speed, the controller is further configured to control the following operations to be performed: When the suction superheat of the compressor is greater than a second temperature value, reducing the opening of the first valve device; When the suction superheat of the compressor is less than a third temperature value, the opening degree of the first valve device is increased.

15. The thermal management system according to any one of claims 12 to 14, characterized in that: The thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the second refrigerant circuit includes the refrigerant flow passages of the compressor, the condenser, and the cooler; the third refrigerant circuit includes the refrigerant flow passages of the compressor, the condenser, and the evaporator; the thermal management system also includes a second valve device; the second valve device is arranged at the refrigerant flow passage inlet of the cooler or at the evaporator inlet; During the process of increasing the speed of the compressor to the second speed, the controller is further configured to control the following operations to be performed: When the suction superheat of the compressor is greater than a second temperature value, increasing the opening of the second valve device; When the suction superheat of the compressor is less than a third temperature value, the opening degree of the second valve device is reduced.

16. The thermal management system according to any one of claims 12 to 15, characterized in that: The thermal management system further includes a gas-liquid separator and a condenser, the gas-liquid separator being disposed at the inlet of the compressor; the refrigerant flow channel inlet of the condenser being in communication with the outlet of the compressor and the inlet of the bypass path; the first refrigerant circuit further includes a first valve device, the inlet of the first valve device being in communication with the inlet of the bypass path, and the outlet of the first valve device being in communication with the outlet of the bypass path; During the process of increasing the speed of the compressor to the second speed, the controller is further configured to control the following operations to be performed: When the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is greater than a fourth temperature value, reducing the opening of the first valve device; When the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is less than a fifth temperature value, the opening degree of the first valve device is increased.

17. The thermal management system according to any one of claims 12 to 16, characterized in that: The thermal management system further includes a gas-liquid separator, which is arranged at the inlet of the compressor; the thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the second refrigerant circuit includes the refrigerant flow channels of the compressor, the condenser, and the cooler; the third refrigerant circuit includes the refrigerant flow channels of the compressor, the condenser, and the evaporator; the thermal management system further includes a second valve device; the second valve device is arranged at the inlet of the refrigerant flow channel of the cooler, or at the inlet of the evaporator; During the process of increasing the speed of the compressor to the second speed, the controller is further configured to control the following operations to be performed: When the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is greater than a fourth temperature value, increasing the opening of the second valve device; When the degree of subcooling at the outlet of the refrigerant flow channel of the condenser is less than a fifth temperature value, the opening degree of the second valve device is reduced.

18. The thermal management system according to any one of claims 12 to 17, characterized in that: The thermal management system further includes a second coolant circuit, which includes a coolant flow channel of the condenser, a heater core, and a second water pump; the controller is further configured to control the following operations: When the outlet pressure of the compressor reaches a second pressure value and / or the output power of the compressor reaches a first power value, the second water pump is turned on and operates at a first duty cycle.

19. The thermal management system according to claim 18, wherein: The first refrigerant circuit further includes a first valve device, an inlet of the first valve device being in communication with an inlet of the bypass path, and an outlet of the first valve device being in communication with an outlet of the bypass path; in the process of increasing the duty cycle of the second water pump to a second duty cycle according to the speed of the compressor and the air volume of the blower, the controller is further configured to control the following operations to be performed: When the outlet pressure of the compressor is less than a third pressure value and the inlet pressure of the compressor is less than an upper limit of the compressor inlet pressure, reducing the opening of the first valve device; When the outlet pressure of the compressor is greater than the fourth pressure value and the inlet pressure of the compressor is less than the compressor inlet pressure lower limit value, the opening degree of the first valve device is increased.

20. The thermal management system according to claim 19, wherein: The thermal management system includes a second refrigerant circuit or a third refrigerant circuit; the second refrigerant circuit includes the refrigerant flow passages of the compressor, the condenser, and the cooler; the third refrigerant circuit includes the refrigerant flow passages of the compressor, the condenser, and the evaporator; the thermal management system also includes a second valve device; the second valve device is arranged at the refrigerant flow passage inlet of the cooler or at the evaporator inlet; In the process of increasing the duty cycle of the second water pump to the second duty cycle according to the rotation speed of the compressor and the air volume of the blower, the controller is further configured to control the following operations to be performed: When the outlet pressure of the compressor is less than a third pressure value and the inlet pressure of the compressor is less than an upper limit of the compressor inlet pressure, reducing the opening of the second valve device; When the outlet pressure of the compressor is greater than the fourth pressure value and the inlet pressure of the compressor is less than the compressor inlet pressure lower limit value, the opening degree of the second valve device is increased.

21. The thermal management system according to any one of claims 18 to 20, characterized in that: The thermal management system further includes a third valve device; an inlet of the third valve device is connected to the outlet of the compressor and the inlet of the bypass path; After the second water pump is turned on, the controller is further configured to control the following operations to be performed: The opening degree of the third valve device is increased according to the outlet pressure and temperature of the compressor.

22. The thermal management system according to claim 21, wherein: The thermal management system further includes a blower, which is used to deliver hot air generated by the heater core; before starting the compressor, the controller is further used to control the following operation to be performed: turning on the blower.

23. A controller, characterized in that: The controller includes a processor and a memory, wherein the memory is used to store computer programs or computer instructions, and the processor is used to execute the computer programs or computer instructions stored in the memory, so that the controller executes the method according to any one of claims 1 to 11.

24. A vehicle, characterized in that: The vehicle comprises the thermal management system according to any one of claims 12 to 22; or, the vehicle comprises the controller according to claim 23.

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