Shutdown control method and device of passenger car thermal management system, passenger car and storage medium

Abstract

The application discloses a kind of passenger car thermal management system shutdown control method, device, passenger car and storage medium, the method comprises: when receiving the shutdown instruction of passenger car thermal management system, determine the current operating mode of passenger car thermal management system;According to the current operating mode of passenger car thermal management system, determine the shutdown mode of passenger car thermal management system under the current operating mode;Shutdown mode includes: after receiving the shutdown instruction, control passenger car thermal management system sequentially enters the first stage of shutdown and restart standby phase of passenger car thermal management system under the current operating mode;After restart standby phase ends, control passenger car thermal management system stops and keeps, until the preset shutdown duration under the current operating mode is reached after stop keeping time length, finally determine passenger car thermal management system shutdown under the current operating mode.The scheme makes passenger car thermal management system realize stable shutdown, guarantees the system reliability of passenger car thermal management system when shutting down.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of automobiles, and particularly relates to a shutdown control method and device for a thermal management system of a passenger vehicle, a passenger vehicle, and a storage medium, and particularly relates to a control method and device for an air conditioner shutdown phase of an integrated thermal management passenger vehicle, a passenger vehicle, and a storage medium. BACKGROUND

[0002] In recent years, with the changes in international energy environment and national policies, pure electric passenger vehicles have developed rapidly, and the requirement for battery energy density is higher and higher. The battery liquid cooling heat dissipation mode has been favored by the market because of its more stable heat exchange and higher heat exchange efficiency. The integrated thermal management passenger vehicle air conditioner integrates the air conditioning system and the battery liquid cooling system into one, can realize unified control and management, has the advantages of compact structure and low cost, and is an important direction for the future development of pure electric passenger vehicles.

[0003] The integrated thermal management passenger vehicle air conditioner has three modes, namely, a separate battery cooling mode, a separate air conditioning mode, and a battery cooling plus air conditioning mode. They are switched by two valve-closed no-flow electronic expansion valves. During the operation of the integrated thermal management passenger vehicle air conditioner, there is a large high-low pressure difference. When the air conditioner is shut down, the compressor is suddenly stopped, and the large pressure difference can cause some high-pressure liquid in the condenser to quickly pass through the system pipeline back to the compressor, causing compressor liquid strike. The liquid strike produces a great impact on the vortex disc, which can break the vortex disc. In addition, the lubricating oil containing a large amount of liquid refrigerant has low viscosity and cannot form a sufficient oil film on the friction surface, which can cause rapid wear of the internal moving parts of the compressor. In addition, the refrigerant in the lubricating oil will boil when it is heated during transportation, affecting the normal transportation of the lubricating oil.

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The present application aims to provide a shutdown control method and device for a thermal management system of a passenger vehicle, a passenger vehicle, and a storage medium, to solve the problems of compressor liquid strike and compressor oil starvation wear caused by the sudden shutdown of the compressor when the passenger vehicle thermal management system is shut down. By determining different shutdown methods when the passenger vehicle thermal management system is running in different modes, the stable shutdown of the passenger vehicle thermal management system is realized, the abnormal wear of the compressor is effectively prevented, and the system reliability of the passenger vehicle thermal management system during shutdown is ensured.

[0006] The application provides a shutdown control method of a passenger car thermal management system, the passenger car thermal management system comprising: an air conditioning system and a battery liquid cooling system; the passenger car thermal management system can operate in any one of a single air conditioning mode, a single battery cooling mode and a battery cooling plus air conditioning mode; the single air conditioning mode is a mode in which the air conditioning system operates alone; the single battery cooling mode is a mode in which the battery liquid cooling system operates alone; the battery cooling plus air conditioning mode is a mode in which the air conditioning system and the battery liquid cooling system jointly operate; the shutdown control method of the passenger car thermal management system comprises: when a shutdown instruction of the passenger car thermal management system is received, determining a current operating mode of the passenger car thermal management system; the current operating mode of the passenger car thermal management system is any one of the single air conditioning mode, the single battery cooling mode and the battery cooling plus air conditioning mode; according to the current operating mode of the passenger car thermal management system, determining a shutdown mode of the passenger car thermal management system in the current operating mode; in the current operating mode of the passenger car thermal management system, controlling the passenger car thermal management system to shut down in the shutdown mode of the passenger car thermal management system in the current operating mode; wherein the shutdown mode of the passenger car thermal management system in the current operating mode comprises: after the shutdown instruction is received, controlling the passenger car thermal management system to enter a first shutdown stage of the passenger car thermal management system in the current operating mode; after the first shutdown stage of the passenger car thermal management system in the current operating mode ends, controlling the passenger car thermal management system to enter a restart standby stage of the passenger car thermal management system in the current operating mode; after the restart standby stage of the passenger car thermal management system in the current operating mode ends, controlling the passenger car thermal management system to stop and keep until a stop and keep time length of the passenger car thermal management system in the current operating mode reaches a preset shutdown time length of the passenger car thermal management system in the current operating mode, and finally determining that the passenger car thermal management system is shut down in the current operating mode.

[0007] In some embodiments, when the current operation mode is the separate air conditioning mode, the control of the passenger car thermal management system into the first shutdown stage of the passenger car thermal management system in the current operation mode includes: detecting the current operation frequency of the compressor, determining the target frequency of the compressor according to whether the current operation frequency is greater than a first preset frequency; if the current operation frequency is greater than the first preset frequency, the target frequency of the compressor is the first preset frequency; if the current operation frequency is less than or equal to the first preset frequency, the target frequency of the compressor is the current operation frequency; under the condition that the air conditioning expansion valve and the battery expansion valve maintain the current opening degree and the adjustment of the external fan gear position is the medium wind gear, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a first preset time, then the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are turned off, and the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode; the control of the passenger car thermal management system into the restart standby stage of the passenger car thermal management system in the current operation mode includes: adjusting the opening degree of the air conditioning expansion valve to half of the air conditioning expansion valve opening degree in the separate air conditioning mode, and simultaneously acquiring the external environment temperature, and controlling the external fan gear position according to the external environment temperature; if the external environment temperature is less than or equal to a first preset temperature, the external fan remains in the closed state; if the external environment temperature is greater than the first preset temperature, the external fan is controlled to open the medium wind gear; after the passenger car thermal management system in the separate air conditioning mode enters the restart standby stage for a second preset time, the external fan is turned off, and until the passenger car thermal management system in the separate air conditioning mode enters the restart standby stage for the first preset time, the air conditioning expansion valve is turned off and the restart standby stage is exited or the restart standby stage is directly exited, wherein the second preset time is less than the first preset time.

[0008] In some embodiments, when the current operation mode is the separate battery cooling mode, the control of the passenger car thermal management system into the first shutdown stage of the passenger car thermal management system in the current operation mode comprises: detecting the current operation frequency of the compressor, determining the target frequency of the compressor according to whether the current operation frequency is greater than a second preset frequency; if the current operation frequency is greater than the second preset frequency, the target frequency of the compressor is the second preset frequency; if the current operation frequency is less than or equal to the second preset frequency, the target frequency of the compressor is the current operation frequency; under the condition that the air conditioning expansion valve and the battery expansion valve maintain the current opening degree and the adjustment of the external fan gear to the medium wind gear, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a third preset time, then the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are turned off, and the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode; the control of the passenger car thermal management system into the restart standby stage of the passenger car thermal management system in the current operation mode comprises: the passenger car thermal management system exits the restart standby stage after the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are turned off for a first preset time.

[0009] In some embodiments, when the current operation mode is the battery cooling and air conditioning mode, the control of the passenger car thermal management system into the first shutdown stage of the passenger car thermal management system in the current operation mode includes: detecting the current operation frequency of the compressor, determining the target frequency of the compressor according to whether the current operation frequency is greater than a third preset frequency; if the current operation frequency is greater than the third preset frequency, the target frequency of the compressor is the third preset frequency; if the current operation frequency is less than or equal to the third preset frequency, the target frequency of the compressor is the current operation frequency; under the condition that the air conditioning expansion valve and the battery expansion valve maintain the current opening degree and the adjustment of the external fan to the medium wind position, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a first preset time, then the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are closed, and the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode; the control of the passenger car thermal management system into the restart standby stage of the passenger car thermal management system in the current operation mode includes: adjusting the opening degree of the air conditioning expansion valve to half of the air conditioning expansion valve opening degree in the battery cooling and air conditioning mode, and simultaneously acquiring the external environment temperature, and controlling the external fan gear position according to the external environment temperature; if the external environment temperature is less than or equal to a first preset temperature, the external fan remains in a closed state; if the external environment temperature is greater than the first preset temperature, the external fan is controlled to open the medium wind position; after the passenger car thermal management system enters the restart standby stage in the battery cooling and air conditioning mode for a second preset time, the external fan is closed, and until the passenger car thermal management system enters the restart standby stage in the separate air conditioning mode for the first preset time, the air conditioning expansion valve is closed and the restart standby stage is exited or the restart standby stage is directly exited.

[0010] In some embodiments, after the restart standby phase of the passenger car thermal management system in the current operation mode ends, the control of the passenger car thermal management system shutdown holding is maintained until the shutdown holding time length of the passenger car thermal management system in the current operation mode reaches the preset shutdown time length of the passenger car thermal management system in the current operation mode, and the final determination of the shutdown of the passenger car thermal management system in the current operation mode includes: in the case where the current operation mode is the single air conditioning mode, if a new start instruction is received again within the preset shutdown time length of the control of the passenger car thermal management system shutdown holding, the new start instruction is not processed first, the passenger car thermal management system continues to be controlled to be shutdown held, and the new start instruction is processed after it is determined that the passenger car thermal management system is shutdown in the current operation mode; in the case where the current operation mode is the single battery cooling mode or the battery cooling plus air conditioning mode, if a new start instruction is received again within the preset shutdown time length of the control of the passenger car thermal management system shutdown holding, it is determined whether the shutdown holding time length of the passenger car thermal management system at this time is greater than a fourth preset time, if the shutdown holding time length of the passenger car thermal management system at this time is greater than the fourth preset time, the passenger car thermal management system is controlled to exit the shutdown holding and directly process the new start instruction, and if the shutdown holding time length of the passenger car thermal management system at this time is less than or equal to the fourth preset time, the new start instruction is not processed first, the passenger car thermal management system continues to be controlled to be shutdown held, and the new start instruction is processed after it is determined that the shutdown holding time length of the passenger car thermal management system is greater than the fourth preset time, wherein the fourth preset time is less than the preset shutdown time length.

[0011] According to the above method, another aspect of the present application provides a shutdown control device of a passenger car thermal management system, the passenger car thermal management system comprising: an air conditioning system and a battery liquid cooling system; the passenger car thermal management system being capable of operating in any one of a single air conditioning mode, a single battery cooling mode, and a battery cooling plus air conditioning mode; the single air conditioning mode being a mode in which the air conditioning system operates alone; the single battery cooling mode being a mode in which the battery liquid cooling system operates alone; the battery cooling plus air conditioning mode being a mode in which the air conditioning system and the battery liquid cooling system jointly operate; the shutdown control device of the passenger car thermal management system comprising: a control unit configured to determine a current operating mode of the passenger car thermal management system upon receiving a shutdown instruction of the passenger car thermal management system; the current operating mode of the passenger car thermal management system being any one of the single air conditioning mode, the single battery cooling mode, and the battery cooling plus air conditioning mode; the control unit being further configured to determine a shutdown manner of the passenger car thermal management system in the current operating mode according to the current operating mode of the passenger car thermal management system; the control unit being further configured to control the passenger car thermal management system to shut down in the shutdown manner of the passenger car thermal management system in the current operating mode under the current operating mode of the passenger car thermal management system; wherein the shutdown manner of the passenger car thermal management system in the current operating mode comprises: after receiving the shutdown instruction, controlling the passenger car thermal management system to enter a first shutdown phase of the passenger car thermal management system in the current operating mode; after the first shutdown phase of the passenger car thermal management system in the current operating mode ends, controlling the passenger car thermal management system to enter a restart standby phase of the passenger car thermal management system in the current operating mode; after the restart standby phase of the passenger car thermal management system in the current operating mode ends, controlling the passenger car thermal management system to stop and keep until a stop and keep time length of the passenger car thermal management system in the current operating mode reaches a preset shutdown time length of the passenger car thermal management system in the current operating mode, and finally determining the passenger car thermal management system to shut down in the current operating mode.

[0012] In some embodiments, the control unit, in the case that the current operation mode is the separate air conditioning mode, controls the passenger car thermal management system to enter a first shutdown stage of the passenger car thermal management system in the current operation mode, including: detecting a current operation frequency of the compressor, determining a target frequency of the compressor according to whether the current operation frequency is greater than a first preset frequency; if the current operation frequency is greater than the first preset frequency, the target frequency of the compressor is the first preset frequency; if the current operation frequency is less than or equal to the first preset frequency, the target frequency of the compressor is the current operation frequency; in the case that the air conditioning expansion valve and the battery expansion valve maintain a current opening degree and the adjustment of the external fan gear position to the medium wind gear, the control unit controls the passenger car thermal management system to operate at the target frequency of the compressor for a first preset time, then closes the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve, and the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode; the control unit controls the passenger car thermal management system to enter a restart standby stage of the passenger car thermal management system in the current operation mode, including: adjusting the opening degree of the air conditioning expansion valve to half of the opening degree of the air conditioning expansion valve in the separate air conditioning mode, and simultaneously acquiring an external environment temperature, and controlling the external fan gear position according to the external environment temperature; if the external environment temperature is less than or equal to a first preset temperature, the external fan remains in a closed state; if the external environment temperature is greater than the first preset temperature, the control unit controls the external fan to open the medium wind gear; after the passenger car thermal management system in the separate air conditioning mode enters the restart standby stage for a second preset time, the external fan is closed, and until the passenger car thermal management system in the separate air conditioning mode enters the restart standby stage for the first preset time, the air conditioning expansion valve is closed and the restart standby stage is exited or the restart standby stage is directly exited, wherein the second preset time is less than the first preset time.

[0013] In some embodiments, the control unit, in the case that the current operation mode is the separate battery cooling mode, controls the passenger car thermal management system to enter a first shutdown stage of the passenger car thermal management system in the current operation mode, including: detecting a current operation frequency of the compressor, determining a target frequency of the compressor according to whether the current operation frequency is greater than a second preset frequency; if the current operation frequency is greater than the second preset frequency, the target frequency of the compressor is the second preset frequency; if the current operation frequency is less than or equal to the second preset frequency, the target frequency of the compressor is the current operation frequency; in the case that the air conditioning expansion valve and the battery expansion valve maintain a current opening degree and the adjustment of the external fan gear to the medium gear, controlling the passenger car thermal management system to operate at the target frequency of the compressor for a third preset time, then turning off the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve, the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode; controlling the passenger car thermal management system to enter a restart standby stage of the passenger car thermal management system in the current operation mode, including: the passenger car thermal management system exits the restart standby stage after turning off the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve for a first preset time.

[0014] In some embodiments, the control unit, in the case that the current operation mode is the battery cooling and air conditioning mode, controls the passenger car thermal management system to enter a first shutdown stage of the passenger car thermal management system in the current operation mode, including: detecting a current operation frequency of the compressor, determining a target frequency of the compressor according to whether the current operation frequency is greater than a third preset frequency; if the current operation frequency is greater than the third preset frequency, the target frequency of the compressor is the third preset frequency; if the current operation frequency is less than or equal to the third preset frequency, the target frequency of the compressor is the current operation frequency; in the case that the air conditioning expansion valve and the battery expansion valve maintain a current opening degree and the adjustment of the external fan to the medium wind gear, controlling the passenger car thermal management system to operate at the target frequency of the compressor for a first preset time, then closing the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve, and the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode; controlling the passenger car thermal management system to enter a restart standby stage of the passenger car thermal management system in the current operation mode, including: adjusting the opening degree of the air conditioning expansion valve to half of the opening degree of the air conditioning expansion valve in the battery cooling and air conditioning mode, and simultaneously acquiring an external environment temperature, controlling the gear of the external fan according to the external environment temperature; if the external environment temperature is less than or equal to a first preset temperature, the external fan remains in a closed state; if the external environment temperature is greater than the first preset temperature, the external fan is controlled to open the medium wind gear; after the passenger car thermal management system enters the restart standby stage in the battery cooling and air conditioning mode for a second preset time, the external fan is closed, and until the passenger car thermal management system enters the restart standby stage in the separate air conditioning mode for the first preset time, the air conditioning expansion valve is closed and the restart standby stage is exited or the restart standby stage is directly exited.

[0015] In some embodiments, after the restart standby phase of the passenger car thermal management system in the current operation mode ends, the control unit controls the passenger car thermal management system to stop holding until the holding time of the passenger car thermal management system in the current operation mode reaches the preset shutdown time of the passenger car thermal management system in the current operation mode, and finally determines the shutdown of the passenger car thermal management system in the current operation mode. In the case where the current operation mode is the single air conditioner mode, if a new start instruction is received again within the preset shutdown time of the passenger car thermal management system in the stop holding state, the new start instruction is not processed first, the passenger car thermal management system continues to be controlled to stop holding, and after it is determined that the passenger car thermal management system is shut down in the current operation mode, the new start instruction is processed. In the case where the current operation mode is the single battery cooling mode or the battery cooling plus air conditioner mode, if a new start instruction is received again within the preset shutdown time of the passenger car thermal management system in the stop holding state, it is determined whether the holding time of the passenger car thermal management system at this time is greater than a fourth preset time. If the holding time of the passenger car thermal management system at this time is greater than the fourth preset time, the passenger car thermal management system is controlled to exit the stop holding state and directly process the new start instruction. If the holding time of the passenger car thermal management system at this time is less than or equal to the fourth preset time, the new start instruction is not processed first, the passenger car thermal management system continues to be controlled to stop holding, and after it is determined that the holding time of the passenger car thermal management system is greater than the fourth preset time, the new start instruction is processed. The fourth preset time is less than the preset shutdown time.

[0016] To match the above device, the present application further provides a passenger car, comprising: the shutdown control device of the passenger car thermal management system described above.

[0017] To match the above method, the present application further provides a storage medium, which comprises a stored program. When the program runs, the device where the storage medium is located executes the shutdown control method of the passenger car thermal management system described above.

[0018] Therefore, the scheme of the present application determines the current operation mode of the passenger car thermal management system, determines the shutdown mode of the passenger car thermal management system in the current operation mode according to the current operation mode of the passenger car thermal management system, controls the passenger car thermal management system to enter a shutdown first phase, a restart standby phase, and a stop holding state for a preset shutdown time, and finally determines the shutdown to balance the pressure difference of the passenger car thermal management system in different operation modes and ensure the system reliability when the passenger car thermal management system is shut down.

[0019] Other features and advantages of the present application will be set forth in the following description, and in part will be apparent from the description, or can be learned by practice of the application.

[0020] The technical solutions of the present application are described in further detail below with the aid of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Flowchart of an embodiment of the method for shutdown control of the bus thermal management system of the present application;

[0022] Figure 2 Control flowchart of an embodiment of the method for shutdown control of the bus thermal management system of the present application. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in detail with the aid of specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0024] Since the cold energy demand is different and varies greatly in each mode during operation of the bus thermal management system, and there is a high-low pressure difference during refrigeration of the bus thermal management system, when receiving a shutdown instruction, the compressor is suddenly stopped, and the large pressure difference will cause part of the high-pressure liquid in the condenser to quickly pass through the system pipeline back to the compressor, causing liquid hammer of the compressor, which will generate a great impact force on the vortex disc and possibly break the vortex disc; in addition, the lubricating oil containing a large amount of liquid refrigerant has low viscosity and cannot form sufficient oil film on the friction surface, which will cause rapid wear of the internal moving parts of the compressor; in addition, the refrigerant in the lubricating oil will boil when heated during transportation, affecting the normal transportation of the lubricating oil, so different shutdown methods are needed to improve the system reliability when the bus thermal management system is stopped.

[0025] Generally speaking, the air conditioning cold energy demand is different and varies greatly in different modes. The greater the cold energy demand, the higher the compressor frequency, and the higher the corresponding exhaust pressure and temperature, and the greater the system pressure difference. When the compressor frequency is fixed at a relatively low value during shutdown and maintained for a certain period of time, this process is equivalent to a buffer zone, and at this time the exhaust pressure and temperature are relatively low, i.e. the system pressure difference is also relatively low. Therefore, the present application provides a shutdown control method for a bus thermal management system.

[0026] According to an embodiment of the present application, a shutdown control method for a bus thermal management system is provided, as shown in Figure 1A flowchart of an embodiment of the method of the application is shown. The passenger car thermal management system comprises an air conditioning system and a battery liquid cooling system. The passenger car thermal management system can operate in any one of a single air conditioning mode, a single battery cooling mode, and a battery cooling plus air conditioning mode. The single air conditioning mode is a mode in which the air conditioning system operates alone. The single battery cooling mode is a mode in which the battery liquid cooling system operates alone. The battery cooling plus air conditioning mode is a mode in which the air conditioning system and the battery liquid cooling system operate jointly. The shutdown control method of the passenger car thermal management system comprises steps S110 to S130.

[0027] At step S110, upon receiving a shutdown instruction of the passenger car thermal management system, the current operating mode of the passenger car thermal management system is determined. The current operating mode of the passenger car thermal management system is any one of the single air conditioning mode, the single battery cooling mode, and the battery cooling plus air conditioning mode.

[0028] At step S120, according to the current operating mode of the passenger car thermal management system, the shutdown manner of the passenger car thermal management system in the current operating mode is determined.

[0029] At step S130, in the current operating mode of the passenger car thermal management system, the passenger car thermal management system is controlled to be shut down in the shutdown manner of the passenger car thermal management system in the current operating mode. The shutdown manner of the passenger car thermal management system in the current operating mode comprises the following steps. After receiving the shutdown instruction, the passenger car thermal management system is controlled to enter a first shutdown phase of the passenger car thermal management system in the current operating mode. After the first shutdown phase of the passenger car thermal management system in the current operating mode ends, the passenger car thermal management system is controlled to enter a restart standby phase of the passenger car thermal management system in the current operating mode. After the restart standby phase of the passenger car thermal management system in the current operating mode ends, the passenger car thermal management system is controlled to be kept shut down until a shutdown keeping time length of the passenger car thermal management system in the current operating mode reaches a preset shutdown time length of the passenger car thermal management system in the current operating mode, and finally the passenger car thermal management system in the current operating mode is shut down.

[0030] In some embodiments, when the current operation mode is the separate air conditioning mode, the control of the passenger car thermal management system entering the first shutdown stage of the passenger car thermal management system in the current operation mode includes: detecting the current operation frequency of the compressor, determining the target frequency of the compressor according to whether the current operation frequency is greater than a first preset frequency; if the current operation frequency is greater than the first preset frequency, the target frequency of the compressor is the first preset frequency; if the current operation frequency is less than or equal to the first preset frequency, the target frequency of the compressor is the current operation frequency; under the condition that the air conditioning expansion valve and the battery expansion valve maintain the current opening degree and the adjustment of the external fan gear to the medium wind gear, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a first preset time, and then the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are turned off.

[0031] Further, the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode; the control of the passenger car thermal management system entering the restart standby stage of the passenger car thermal management system in the current operation mode includes: adjusting the opening degree of the air conditioning expansion valve to half of the air conditioning expansion valve opening degree in the separate air conditioning mode, and simultaneously acquiring the external environment temperature, and controlling the external fan gear according to the external environment temperature; if the external environment temperature is less than or equal to a first preset temperature, the external fan remains in the closed state; if the external environment temperature is greater than the first preset temperature, the external fan is controlled to open the medium wind gear; after the passenger car thermal management system in the separate air conditioning mode enters the restart standby stage for a second preset time, the external fan is turned off, and until the passenger car thermal management system in the separate air conditioning mode enters the restart standby stage for the first preset time, the air conditioning expansion valve is turned off and the restart standby stage is exited or the restart standby stage is directly exited, wherein the second preset time is less than the first preset time.

[0032] Further, after the restart standby stage ends, the passenger car thermal management system is controlled to stop and remain, and until the stop and remain time of the passenger car thermal management system in the separate air conditioning mode reaches the preset shutdown time of the passenger car thermal management system in the separate air conditioning mode, the passenger car thermal management system in the separate air conditioning mode is finally determined to be shut down. More specifically, when the current operation mode is the separate air conditioning mode, within the preset shutdown time of the passenger car thermal management system being controlled to stop and remain, if a new start instruction is received again, the new start instruction is not processed first, and the passenger car thermal management system continues to be controlled to stop and remain, and after it is determined that the passenger car thermal management system is shut down in the current operation mode, the new start instruction is processed.

[0033] Specifically, the first preset frequency can be customized. In this embodiment, the value range of the first preset frequency is 28Hz to 32Hz. Preferably, in this embodiment, the first preset frequency is 30Hz, which is more conducive to balancing the pressure difference and compressor oil return. When the current operating mode is the standby air conditioning mode, the air conditioning expansion valve is open and the battery expansion valve is closed. When the bus thermal management system enters the first stage of shutdown in standby air conditioning mode, the air conditioning expansion valve maintains its current opening degree for a first preset time, and the battery expansion valve remains closed. When exiting the first stage of shutdown, the air conditioning expansion valve closes. When the bus thermal management system enters the restart standby stage, the air conditioning expansion valve reopens, and the opening degree of the air conditioning expansion valve is half of the opening degree in the first stage of shutdown. It maintains this opening degree for a first preset time and then closes, while the battery expansion valve remains closed. In this embodiment, the first preset time is 60s, the second preset time is 20s, the first preset temperature is 30°C, and the preset shutdown duration is 110s.

[0034] The following is combined with Figure 2 The control flowchart of an embodiment of the bus thermal management system shutdown control method of the present invention is shown below. Further, the shutdown method for controlling the bus thermal management system to shut down in standby air conditioning mode is as follows:

[0035] When the passenger car thermal management system receives a shutdown instruction, a first shutdown stage is entered. If the current operating frequency of the compressor > P1, the compressor is operated at a frequency P1 for 60 s and then turned off; if the current operating frequency ≤ P1, the compressor is operated at the current operating frequency for 60 s and then turned off, and the external fan is kept at the middle gear for 60 s and then turned off; the opening degree of the air conditioning expansion valve is maintained at the opening degree before the shutdown instruction is received for 60 s and then closed; and the opening degree of the battery expansion valve is 0. P1 is a first preset frequency, and in this embodiment, P1 is 30 Hz. When the compressor, the external fan, the air conditioning expansion valve, and the battery expansion valve are turned off, a restart standby stage is entered. In this stage, the compressor is continuously kept off, the air conditioning expansion valve is kept at an opening degree B1 for 60 s and then closed, and the opening degree of the battery expansion valve is 0. While the air conditioning expansion valve is kept at the opening degree B1, if the external environment temperature is greater than 30°, the external fan is turned on to the middle gear and kept for 20 s and then turned off; and if the external environment temperature is less than or equal to 30°, the external fan is kept in the off state and is not turned on. The opening degree B1 is half of the opening degree of the air conditioning expansion valve before the shutdown instruction is received. When the air conditioning expansion valve is closed, the passenger car thermal management system is controlled to stop and keep the current state until the passenger car thermal management system in the separate air conditioning mode is kept stopped for 110 s, and then the passenger car thermal management system is completely shut down. Moreover, during the 110 s of stop and keep, if a new start instruction is received, the new start instruction is not processed first, the passenger car thermal management system is continuously controlled to stop and keep, and then the passenger car thermal management system is completely shut down before the new start instruction is processed to control the passenger car thermal management system to start again.

[0036] In some embodiments, when the current operating mode is the separate battery cooling mode, the passenger car thermal management system is controlled to enter a first shutdown stage of the passenger car thermal management system in the current operating mode, including: detecting the current operating frequency of the compressor, determining the target frequency of the compressor according to whether the current operating frequency is greater than a second preset frequency; if the current operating frequency is greater than the second preset frequency, the target frequency of the compressor is the second preset frequency; if the current operating frequency is less than or equal to the second preset frequency, the target frequency of the compressor is the current operating frequency; and in the case where the air conditioning expansion valve and the battery expansion valve maintain the current opening degree and the external fan gear is adjusted to the middle gear, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a third preset time, and then the compressor, the external fan, the air conditioning expansion valve, and the battery expansion valve are turned off, and the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operating mode.

[0037] Further, the control of the passenger car thermal management system into the restart standby phase of the current operation mode of the passenger car thermal management system includes: the passenger car thermal management system exits the restart standby phase after the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are closed for a first preset time.

[0038] Further, after the restart standby phase ends, the passenger car thermal management system is controlled to stop and keep until the passenger car thermal management system in the separate battery cooling mode stops and keeps for a preset shutdown time of the passenger car thermal management system in the separate battery cooling mode, and finally determines that the passenger car thermal management system in the separate battery cooling mode is shut down. More specifically, in the case where the current operation mode is the separate battery cooling mode, within the preset shutdown time of the passenger car thermal management system stop and keep, if a new start instruction is received again, it is judged whether the passenger car thermal management system stop and keep time is greater than the fourth preset time at this time, if the passenger car thermal management system stop and keep time is greater than the fourth preset time at this time, the passenger car thermal management system is controlled to exit the stop and keep, and directly process the new start instruction; if the passenger car thermal management system stop and keep time is less than or equal to the fourth preset time at this time, the new start instruction is not processed first, the passenger car thermal management system is controlled to continue to stop and keep, and then the new start instruction is processed after it is determined that the passenger car thermal management system stop and keep time is greater than the fourth preset time, wherein the fourth preset time is less than the preset shutdown time.

[0039] Specifically, the first preset frequency can be set by the user, in the embodiment, the second preset frequency is 18Hz to 22Hz, preferably, in the embodiment, the second preset frequency is 20Hz, which is more conducive to balancing the pressure difference and the compressor oil return. In the case where the current operation mode is the separate battery cooling mode, the air conditioning expansion valve is in the closed state, and the battery expansion valve is in the open state, when the passenger car thermal management system enters the shutdown first stage of the separate battery cooling mode, the battery expansion valve maintains the current opening degree for a third preset time, and the air conditioning expansion valve always remains in the closed state; when the shutdown first stage is exited, the battery expansion valve is closed. When the passenger car thermal management system enters the restart standby phase, the current state is maintained for a first preset time, i.e. the restart standby phase, the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are all closed. The third preset time is 40s, and the fourth preset time is 50s.

[0040] The following will be described in combination with Figure 2The control flow chart of an embodiment of the shutdown control method of the passenger car thermal management system of the present application is shown, which further illustrates the specific shutdown mode of the passenger car thermal management system in the separate battery cooling mode.

[0041] When the passenger car thermal management system receives a shutdown instruction, it enters the first shutdown stage. If the current operating frequency of the compressor is greater than P2, it is turned off after running at the frequency P2 for 40s; if the current operating frequency is less than or equal to P2, it is turned off after running at the current operating frequency for 40s, while the external fan is turned off after maintaining the middle gear for 40s. In the separate battery cooling mode, the required cooling capacity is small, i.e. the required heat exchange capacity of the condenser is small, and the external fan gear is generally low gear, so the external fan is first controlled to rise to the middle gear. The battery expansion valve opening degree is maintained for 40s at the opening degree before the shutdown instruction is received, and then closed. The air conditioning expansion valve opening degree is 0. P2 is the second preset frequency, which is 20Hz in this embodiment. When the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are turned off, the system enters the restart standby stage. After maintaining the closed state for 60s, the passenger car thermal management system is controlled to stop and keep the current state. After the passenger car thermal management system in the separate battery cooling mode is kept stopped for 110s, the passenger car thermal management system is completely shut down. And within the 110s of stop and keep, if a new start instruction is received again, it is judged whether the passenger car thermal management system stop and keep time is greater than 50s, if the passenger car thermal management system stop and keep time is greater than the fourth preset time 50s at this time, the passenger car thermal management system is controlled to exit the stop and keep, and directly process the new start instruction; if the passenger car thermal management system stop and keep time is less than or equal to 50s at this time, the new start instruction is not processed first, and the passenger car thermal management system is controlled to continue to stop and keep, until it is determined that the passenger car thermal management system stop and keep time is greater than 50s, then the new start instruction is processed, and the passenger car thermal management system is restarted.

[0042] In some embodiments, when the current operation mode is the battery cooling and air conditioning mode, the control of the passenger car thermal management system into the first stage of shutdown of the passenger car thermal management system in the current operation mode includes: detecting the current operation frequency of the compressor, determining the target frequency of the compressor according to whether the current operation frequency is greater than a third preset frequency; if the current operation frequency is greater than the third preset frequency, the target frequency of the compressor is the third preset frequency; if the current operation frequency is less than or equal to the third preset frequency, the target frequency of the compressor is the current operation frequency; under the condition that the air conditioning expansion valve and the battery expansion valve maintain the current opening degree and the adjustment of the external fan to the medium wind position, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a first preset time, and then the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are turned off.

[0043] Further, the passenger car thermal management system exits the first stage of shutdown of the passenger car thermal management system in the current operation mode; the control of the passenger car thermal management system into the restart standby stage of the passenger car thermal management system in the current operation mode includes: adjusting the opening degree of the air conditioning expansion valve to half of the air conditioning expansion valve opening degree in the battery cooling and air conditioning mode, and simultaneously acquiring the external environment temperature, and controlling the external fan gear according to the external environment temperature; if the external environment temperature is less than or equal to a first preset temperature, the external fan remains in the closed state; if the external environment temperature is greater than the first preset temperature, the external fan is controlled to open the medium wind position; after the passenger car thermal management system enters the restart standby stage in the battery cooling and air conditioning mode for a second preset time, the external fan is turned off, and until the passenger car thermal management system enters the restart standby stage in the battery cooling and air conditioning mode for the first preset time, the air conditioning expansion valve is turned off and the restart standby stage is exited or the restart standby stage is directly exited.

[0044] Further, after the end of the restart standby phase, the control of the passenger car thermal management system is stopped to keep until the length of time of the passenger car thermal management system in the battery cooling and air conditioning mode reaches the preset shutdown length of time of the passenger car thermal management system in the battery cooling and air conditioning mode, and finally determines the passenger car thermal management system in the battery cooling and air conditioning mode. More specifically, in the case where the current operating mode is the battery cooling and air conditioning mode, within the preset shutdown length of time of the passenger car thermal management system stopped to keep, if a new start instruction is received again, it is judged whether the length of time of the passenger car thermal management system stopped to keep is greater than the fourth preset time, if the length of time of the passenger car thermal management system stopped to keep is greater than the fourth preset time, the passenger car thermal management system is controlled to exit the stop to keep, and the new start instruction is directly processed; if the length of time of the passenger car thermal management system stopped to keep is less than or equal to the fourth preset time, the new start instruction is not processed first, the passenger car thermal management system is continued to be controlled to stop to keep, and the new start instruction is processed after it is determined that the length of time of the passenger car thermal management system stopped to keep is greater than the fourth preset time, wherein the fourth preset time is less than the preset shutdown length of time.

[0045] Specifically, the third preset frequency can be set by the user, in the embodiment, the value range of the third preset frequency can be the same as the value range of the first preset frequency, or slightly greater than the value range of the first preset frequency, in the embodiment, the third preset frequency is the same as the first preset frequency, the third preset frequency is 28Hz to 32Hz, preferably, in the embodiment, the third preset frequency is 30Hz, which is more conducive to balancing the pressure difference and the compressor oil return. In the case where the current operating mode is the battery cooling and air conditioning mode, the air conditioning expansion valve is in the open state, and the battery expansion valve is in the open state, when the passenger car thermal management system enters the first stage of shutdown in the battery cooling and air conditioning mode, the battery expansion valve maintains the current opening degree for a first preset time, and the air conditioning expansion valve maintains the current opening degree for a first preset time; when the first stage of shutdown is exited, the battery expansion valve is closed, and the air conditioning expansion valve is closed. When the passenger car thermal management system enters the restart standby phase, the air conditioning expansion valve is reopened, the opening degree of the air conditioning expansion valve is half of the opening degree in the first stage of shutdown, and is maintained for a first preset time and then closed, while the battery expansion valve is always kept closed.

[0046] The control flowchart of the embodiment of the shutdown control method of the passenger car thermal management system of the application is shown in the following Figure 2 The shutdown mode of the passenger car thermal management system in the battery cooling and air conditioning mode is specifically:

[0047] When the passenger car thermal management system receives a shutdown instruction, a first shutdown stage is entered. If the current operating frequency of the compressor is greater than P3, the compressor is shut down after operating at a frequency of P3 for 60 seconds; if the current operating frequency is less than or equal to P3, the compressor is shut down after operating at the current operating frequency for 60 seconds, and the external fan is shut down after being maintained at the middle gear for 60 seconds; the opening degree of the air conditioning expansion valve and the opening degree of the battery expansion valve are maintained at the opening degrees before the shutdown instruction is received for 60 seconds and then shut down. P3 is a third preset frequency, and in this embodiment, P3 is 30 Hz. When the compressor, the external fan, the air conditioning expansion valve, and the battery expansion valve are shut down, a restart standby stage is entered. In this stage, the compressor is continuously maintained in a shutdown state, the air conditioning expansion valve is maintained at an opening degree of B1 for 60 seconds and then shut down, the opening degree of the battery expansion valve is 0, and when the air conditioning expansion valve is maintained at the opening degree of B1, if the external environment temperature is greater than 30°, the external fan is turned on to the middle gear and maintained for 20 seconds and then shut down, and if the external environment temperature is less than or equal to 30°, the external fan is maintained in a shutdown state. B1 is half of the opening degree of the air conditioning expansion valve before the shutdown instruction is received. When the air conditioning expansion valve is shut down, the passenger car thermal management system is controlled to stop and maintain the current state until the passenger car thermal management system is completely shut down after the stop and maintenance time of the passenger car thermal management system in the battery cooling plus air conditioning mode reaches 110 seconds. Moreover, during the 110 seconds of stop and maintenance, if a new start instruction is received, it is determined whether the stop and maintenance time of the passenger car thermal management system is greater than 50 seconds, if the stop and maintenance time of the passenger car thermal management system is greater than the fourth preset time of 50 seconds, the passenger car thermal management system is controlled to exit the stop and maintenance and directly process the new start instruction, and if the stop and maintenance time of the passenger car thermal management system is less than or equal to 50 seconds, the new start instruction is not processed first, the passenger car thermal management system is continuously controlled to stop and maintain, and the new start instruction is processed and the passenger car thermal management system is restarted after it is determined that the stop and maintenance time of the passenger car thermal management system is greater than 50 seconds.

[0048] The shutdown control method of the passenger car thermal management system provided in the scheme of the present application determines different shutdown modes when the passenger car thermal management system operates in different modes, realizes stable shutdown of the passenger car thermal management system, effectively prevents abnormal wear of the compressor, and ensures system reliability of the passenger car thermal management system during shutdown.

[0049] The technical scheme of the present embodiment determines the current operating mode of the passenger car thermal management system, determines the shutdown mode of the passenger car thermal management system in the current operating mode according to the current operating mode of the passenger car thermal management system, controls the passenger car thermal management system to enter a first shutdown stage, a restart standby stage, and stop and maintain for a preset shutdown time, and determines shutdown to realize stable shutdown of the passenger car thermal management system.

[0050] According to the embodiment of the present application, a shutdown control device of a passenger car thermal management system corresponding to a shutdown control method of the passenger car thermal management system is also provided. The passenger car thermal management system comprises an air conditioning system and a battery liquid cooling system. The passenger car thermal management system can operate in any one of a single air conditioning mode, a single battery cooling mode, and a battery cooling plus air conditioning mode. The single air conditioning mode is a mode in which the air conditioning system operates alone. The single battery cooling mode is a mode in which the battery liquid cooling system operates alone. The battery cooling plus air conditioning mode is a mode in which the air conditioning system and the battery liquid cooling system jointly operate. The shutdown control device of the passenger car thermal management system comprises a control unit.

[0051] The control unit is configured to determine a current operating mode of the passenger car thermal management system upon receiving a shutdown instruction of the passenger car thermal management system. The current operating mode of the passenger car thermal management system is any one of the single air conditioning mode, the single battery cooling mode, and the battery cooling plus air conditioning mode. The specific functions and processes of the control unit are described with reference to step S110.

[0052] The control unit is further configured to determine a shutdown manner of the passenger car thermal management system in the current operating mode according to the current operating mode of the passenger car thermal management system. The specific functions and processes of the control unit are described with reference to step S120.

[0053] The control unit is further configured to control the passenger car thermal management system to shut down in the shutdown manner of the passenger car thermal management system in the current operating mode under the current operating mode of the passenger car thermal management system. The shutdown manner of the passenger car thermal management system in the current operating mode comprises: after receiving the shutdown instruction, controlling the passenger car thermal management system to enter a first shutdown phase of the passenger car thermal management system in the current operating mode; after the first shutdown phase of the passenger car thermal management system in the current operating mode ends, controlling the passenger car thermal management system to enter a restart standby phase of the passenger car thermal management system in the current operating mode; after the restart standby phase of the passenger car thermal management system in the current operating mode ends, controlling the passenger car thermal management system to stop and keep until a stop and keep time length of the passenger car thermal management system in the current operating mode reaches a preset shutdown time length of the passenger car thermal management system in the current operating mode, and finally determining the passenger car thermal management system to shut down in the current operating mode. The specific functions and processes of the control unit are described with reference to step S130.

[0054] In some embodiments, the control unit is configured to, in the case that the current operation mode is the separate air conditioning mode, control the passenger car thermal management system to enter a first shutdown stage of the passenger car thermal management system in the current operation mode, including: detecting a current operation frequency of the compressor, determining a target frequency of the compressor according to whether the current operation frequency is greater than a first preset frequency; if the current operation frequency is greater than the first preset frequency, the target frequency of the compressor is the first preset frequency; if the current operation frequency is less than or equal to the first preset frequency, the target frequency of the compressor is the current operation frequency; in the case that the air conditioning expansion valve and the battery expansion valve maintain a current opening degree and the adjustment of the outer fan gear to a medium wind gear, controlling the passenger car thermal management system to operate at the target frequency of the compressor for a first preset time, and then turning off the compressor, the outer fan, the air conditioning expansion valve and the battery expansion valve.

[0055] Further, the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode, and controls the passenger car thermal management system to enter a restart standby stage of the passenger car thermal management system in the current operation mode, including: adjusting the opening degree of the air conditioning expansion valve to half of the opening degree of the air conditioning expansion valve in the separate air conditioning mode, and simultaneously acquiring an external environment temperature, and controlling the outer fan gear according to the external environment temperature; if the external environment temperature is less than or equal to a first preset temperature, the outer fan remains in an off state; if the external environment temperature is greater than the first preset temperature, the outer fan is controlled to open a medium wind gear; after the passenger car thermal management system in the separate air conditioning mode enters the restart standby stage for a second preset time, the outer fan is turned off, and until the passenger car thermal management system in the separate air conditioning mode enters the restart standby stage for the first preset time, the air conditioning expansion valve is turned off and the restart standby stage is exited or the restart standby stage is directly exited, wherein the second preset time is less than the first preset time.

[0056] Further, after the restart standby stage ends, the passenger car thermal management system is controlled to be in a shutdown state, and until the shutdown state of the passenger car thermal management system in the separate air conditioning mode lasts for a preset shutdown time of the passenger car thermal management system in the separate air conditioning mode, the passenger car thermal management system in the separate air conditioning mode is finally determined to be shut down. More specifically, in the case that the current operation mode is the separate air conditioning mode, if a new start instruction is received again within the preset shutdown time of the passenger car thermal management system in the shutdown state, the new start instruction is not processed first, and the passenger car thermal management system continues to be in the shutdown state, and after the passenger car thermal management system in the current operation mode is determined to be shut down, the new start instruction is processed.

[0057] Specifically, the first preset frequency can be set by the user, and in the embodiment, the first preset frequency ranges from 28 Hz to 32 Hz, preferably, the first preset frequency is 30 Hz in the embodiment, which is more conducive to balancing the pressure difference and the compressor oil return. In the case that the current operation mode is the single air conditioning mode, the air conditioning expansion valve is in an open state, and the battery expansion valve is in a closed state. When the passenger car thermal management system enters the shutdown first stage in the single air conditioning mode, the air conditioning expansion valve maintains the current opening degree for a first preset time, and the battery expansion valve always remains in the closed state. When the shutdown first stage is exited, the air conditioning expansion valve is closed. When the passenger car thermal management system enters the restart standby stage, the air conditioning expansion valve is reopened, the opening degree of the air conditioning expansion valve is half of the opening degree in the shutdown first stage, and the air conditioning expansion valve is closed after maintaining the opening degree for a first preset time, while the battery expansion valve always remains in the closed state. In the embodiment, the first preset time is 60 s, the second preset time is 20 s, the first preset temperature is 30°, and the preset shutdown duration is 110 s.

[0058] The control flowchart of the embodiment of the shutdown control method of the passenger car thermal management system of the application is shown in the following Figure 2 The shutdown mode of the passenger car thermal management system in the single air conditioning mode is specifically as follows:

[0059] When the passenger car thermal management system receives a shutdown instruction, a first shutdown stage is entered. If the current operating frequency of the compressor > P1, the compressor is operated at a frequency P1 for 60 s and then turned off; if the current operating frequency ≤ P1, the compressor is operated at the current operating frequency for 60 s and then turned off, and the external fan is turned off after being maintained at the middle gear for 60 s; the opening degree of the air conditioning expansion valve is maintained at the opening degree before the shutdown instruction is received for 60 s and then closed; and the opening degree of the battery expansion valve is 0. P1 is a first preset frequency, and in this embodiment, P1 is 30 Hz. When the compressor, the external fan, the air conditioning expansion valve, and the battery expansion valve are turned off, a restart standby stage is entered. In this stage, the compressor is continuously kept off, the air conditioning expansion valve is kept at an opening degree B1 for 60 s and then turned off, and the opening degree of the battery expansion valve is 0. While the air conditioning expansion valve is kept at the opening degree B1, if the external environment temperature is greater than 30°, the external fan is turned on to the middle gear and kept for 20 s and then turned off; and if the external environment temperature is less than or equal to 30°, the external fan is kept in the off state without being turned on. The opening degree B1 is half of the opening degree of the air conditioning expansion valve before the shutdown instruction is received. When the air conditioning expansion valve is turned off, the passenger car thermal management system is controlled to stop and keep the current state until the passenger car thermal management system in the separate air conditioning mode is kept stopped for 110 s, and then the passenger car thermal management system is completely turned off. During the 110 s of stop and keep, if a new start instruction is received, the new start instruction is not processed first, the passenger car thermal management system is continuously controlled to stop and keep, and then the passenger car thermal management system is completely turned off before the new start instruction is processed to control the passenger car thermal management system to start again.

[0060] In some embodiments, the control unit is configured to, in a case where the current operating mode is the separate battery cooling mode, control the passenger car thermal management system to enter a first shutdown stage of the passenger car thermal management system in the current operating mode, including: detecting a current operating frequency of the compressor, determining a target frequency of the compressor according to whether the current operating frequency is greater than a second preset frequency; if the current operating frequency is greater than the second preset frequency, the target frequency of the compressor is the second preset frequency; if the current operating frequency is less than or equal to the second preset frequency, the target frequency of the compressor is the current operating frequency; in a case where the air conditioning expansion valve and the battery expansion valve maintain the current opening degree and the external fan gear is adjusted to the middle gear, controlling the passenger car thermal management system to operate at the target frequency of the compressor for a third preset time, and then turning off the compressor, the external fan, the air conditioning expansion valve, and the battery expansion valve, so that the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operating mode.

[0061] Further, the control of the passenger car thermal management system entering the restart standby phase of the passenger car thermal management system in the current operation mode comprises: the passenger car thermal management system exits the restart standby phase after the compressor, the outer fan, the air conditioning expansion valve and the battery expansion valve are closed for a first preset time.

[0062] Further, after the restart standby phase ends, the passenger car thermal management system is controlled to be kept off until the passenger car thermal management system in the separate battery cooling mode is kept off for a preset shutdown time length of the passenger car thermal management system in the separate battery cooling mode, and finally determines that the passenger car thermal management system in the separate battery cooling mode is shut down. More specifically, in the case where the current operation mode is the separate battery cooling mode, within the preset shutdown time length of the passenger car thermal management system kept off, if a new start instruction is received again, it is judged whether the passenger car thermal management system kept off time length is greater than a fourth preset time at this time, if the passenger car thermal management system kept off time length is greater than the fourth preset time at this time, the passenger car thermal management system is controlled to exit the kept off state and directly process the new start instruction; if the passenger car thermal management system kept off time length is less than or equal to the fourth preset time at this time, the new start instruction is not processed first, the passenger car thermal management system is continued to be kept off, and then the new start instruction is processed after it is determined that the passenger car thermal management system kept off time length is greater than the fourth preset time, wherein the fourth preset time is less than the preset shutdown time length.

[0063] Specifically, the first preset frequency can be set by the user, in the embodiment, the second preset frequency is 18Hz to 22Hz, preferably, in the embodiment, the second preset frequency is 20Hz, which is more conducive to balancing the pressure difference and the compressor oil return. In the case where the current operation mode is the separate battery cooling mode, the air conditioning expansion valve is in the closed state, and the battery expansion valve is in the open state, when the passenger car thermal management system enters the first shutdown phase of the separate battery cooling mode, the battery expansion valve maintains the current open degree for a third preset time, and the air conditioning expansion valve is always kept in the closed state; when the first shutdown phase is exited, the battery expansion valve is closed. When the passenger car thermal management system enters the restart standby phase, the current state is maintained for a first preset time, i.e. the restart standby phase, the compressor, the outer fan, the air conditioning expansion valve and the battery expansion valve are all closed. The third preset time is 40s, and the fourth preset time is 50s.

[0064] The following will be described in combination with Figure 2The control flow chart of an embodiment of the shutdown control method of the passenger car thermal management system of the present application further illustrates the specific shutdown mode of the passenger car thermal management system in the separate battery cooling mode.

[0065] When the passenger car thermal management system receives a shutdown instruction, it enters a first shutdown stage. If the current operating frequency of the compressor is greater than P2, the compressor is turned off after running at a frequency of P2 for 40 seconds; if the current operating frequency is less than or equal to P2, the compressor is turned off after running at the current operating frequency for 40 seconds, and the external fan is turned off after running at the medium gear for 40 seconds; in the separate battery cooling mode, the gear of the external fan is generally low, so the external fan is first controlled to rise to the medium gear. The opening degree of the battery expansion valve is maintained at the opening degree before the shutdown instruction is received for 40 seconds, and then the battery expansion valve is turned off; the opening degree of the air conditioning expansion valve is 0. P2 is a second preset frequency, and in this embodiment, P2 is 20 Hz. When the compressor, the external fan, the air conditioning expansion valve, and the battery expansion valve are turned off, a restart standby stage is entered. After maintaining the closed state for 60 seconds, the passenger car thermal management system is controlled to stop and keep the current state. After the passenger car thermal management system in the separate battery cooling mode is kept stopped for 110 seconds, the passenger car thermal management system is completely shut down. Moreover, within the 110 seconds of stop and keep, if a new start instruction is received, it is determined whether the stop and keep time of the passenger car thermal management system is greater than 50 seconds. If the stop and keep time of the passenger car thermal management system is greater than the fourth preset time of 50 seconds, the passenger car thermal management system is controlled to exit the stop and keep state and directly process the new start instruction. If the stop and keep time of the passenger car thermal management system is less than or equal to 50 seconds, the new start instruction is not processed first, and the passenger car thermal management system is controlled to continue to keep stopped until the stop and keep time of the passenger car thermal management system is greater than 50 seconds, and then the new start instruction is processed to control the passenger car thermal management system to restart.

[0066] In some embodiments, the control unit is configured to, in a case where the current operating mode is the battery cooling plus air conditioning mode, control the passenger car thermal management system to enter a first shutdown stage of the passenger car thermal management system in the current operating mode, including: detecting the current operating frequency of the compressor, determining the target frequency of the compressor according to whether the current operating frequency is greater than a third preset frequency; if the current operating frequency is greater than the third preset frequency, the target frequency of the compressor is the third preset frequency; if the current operating frequency is less than or equal to the third preset frequency, the target frequency of the compressor is the current operating frequency; in a case where the air conditioning expansion valve and the battery expansion valve maintain the current opening degree and the external fan is adjusted to the medium gear, the passenger car thermal management system is controlled to run at the target frequency of the compressor for a first preset time, and then the compressor, the external fan, the air conditioning expansion valve, and the battery expansion valve are turned off.

[0067] Further, the passenger car thermal management system exits the first stage of shutdown of the passenger car thermal management system in the current operation mode; controls the passenger car thermal management system to enter the restart standby stage of the passenger car thermal management system in the current operation mode, including: adjusting the opening degree of the air conditioning expansion valve to half of the opening degree of the air conditioning expansion valve in the battery cooling and air conditioning mode, and simultaneously acquiring the external environment temperature; controlling the external fan gear position according to the external environment temperature; if the external environment temperature is less than or equal to a first preset temperature, the external fan remains in a closed state; if the external environment temperature is greater than the first preset temperature, the external fan is controlled to open the medium gear; after the passenger car thermal management system enters the restart standby stage in the battery cooling and air conditioning mode for a second preset time, the external fan is closed; and after the passenger car thermal management system enters the restart standby stage in the battery cooling and air conditioning mode for the first preset time, the air conditioning expansion valve is closed and the restart standby stage is exited or the restart standby stage is directly exited.

[0068] Further, after the restart standby stage ends, the passenger car thermal management system is controlled to stop and remain, until the stop and remain time length of the passenger car thermal management system in the battery cooling and air conditioning mode reaches the preset shutdown time length of the passenger car thermal management system in the battery cooling and air conditioning mode, and finally determines that the passenger car thermal management system is shut down in the battery cooling and air conditioning mode. More specifically, in the case where the current operation mode is the battery cooling and air conditioning mode, if a new start instruction is received again within the preset shutdown time length of the passenger car thermal management system in the stop and remain state, it is judged whether the stop and remain time length of the passenger car thermal management system is greater than a fourth preset time; if the stop and remain time length of the passenger car thermal management system is greater than the fourth preset time, the passenger car thermal management system is controlled to exit the stop and remain state and directly process the new start instruction; if the stop and remain time length of the passenger car thermal management system is less than or equal to the fourth preset time, the new start instruction is not processed first, and the passenger car thermal management system is controlled to continue in the stop and remain state, until it is determined that the stop and remain time length of the passenger car thermal management system is greater than the fourth preset time, and then the new start instruction is processed, wherein the fourth preset time is less than the preset shutdown time length.

[0069] Specifically, the third preset frequency can be self-defined. In the embodiment, the value range of the third preset frequency can be the same as or slightly larger than the value range of the first preset frequency. In the embodiment, the third preset frequency is the same as the first preset frequency, and the third preset frequency is 28 Hz to 32 Hz. Preferably, in the embodiment, the third preset frequency is 30 Hz, which is more conducive to balancing the pressure difference and the compressor oil return. In the case where the current operation mode is the battery cooling plus air conditioning mode, the air conditioning expansion valve is in an open state, and the battery expansion valve is in an open state. When the passenger car thermal management system enters the first shutdown stage of the battery cooling plus air conditioning mode, the battery expansion valve maintains the current opening degree for a first preset time, and the air conditioning expansion valve maintains the current opening degree for a first preset time. When the first shutdown stage is exited, the battery expansion valve is closed, and the air conditioning expansion valve is closed. When the passenger car thermal management system enters the restart standby stage, the air conditioning expansion valve is reopened, the opening degree of the air conditioning expansion valve is half of the opening degree in the first shutdown stage, and the air conditioning expansion valve is closed after maintaining the opening degree for a first preset time. The battery expansion valve is always kept in a closed state.

[0070] The control flowchart of the shutdown control method of the passenger car thermal management system of the application is shown in the following Figure 2 The control flowchart of the shutdown control method of the passenger car thermal management system of the application is shown in the following

[0071] When the passenger car thermal management system receives a shutdown instruction, a first shutdown stage is entered. If the current operating frequency of the compressor > P3, the compressor is shut down after operating at a frequency of P3 for 60 s; if the current operating frequency is ≤ P3, the compressor is shut down after operating at the current operating frequency for 60 s, and the external fan is shut down after being maintained at the middle gear for 60 s; the opening degree of the air conditioner expansion valve and the opening degree of the battery expansion valve are both maintained for 60 s at the opening degrees before the shutdown instruction is received, and then the air conditioner expansion valve and the battery expansion valve are shut down. P3 is a third preset frequency, and in this embodiment, P3 is 30 Hz. When the compressor, the external fan, the air conditioner expansion valve, and the battery expansion valve are shut down, a restart standby stage is entered. In this stage, the compressor is continuously maintained in a shutdown state, the air conditioner expansion valve is maintained at an opening degree of B1 for 60 s and then shut down, the opening degree of the battery expansion valve is 0, and when the air conditioner expansion valve is maintained at the opening degree of B1, if the external environment temperature is greater than 30°, the external fan is turned on to the middle gear and maintained for 20 s and then shut down, and if the external environment temperature is less than or equal to 30°, the external fan is maintained in a shutdown state and is not turned on. B1 is half of the opening degree before the shutdown instruction is received. When the air conditioner expansion valve is shut down, the passenger car thermal management system is controlled to stop and maintain the current state until the passenger car thermal management system is completely shut down after the stop and maintenance time length of the passenger car thermal management system in the battery cooling plus air conditioning mode reaches 110 s. Moreover, during the 110 s of stop and maintenance, if a new start instruction is received, it is determined whether the stop and maintenance time length of the passenger car thermal management system is greater than 50 s. If the stop and maintenance time length of the passenger car thermal management system is greater than the fourth preset time 50 s, the passenger car thermal management system is controlled to exit the stop and maintenance and directly process the new start instruction. If the stop and maintenance time length of the passenger car thermal management system is less than or equal to 50 s, the new start instruction is not processed first, the passenger car thermal management system is continuously controlled to stop and maintain, and the new start instruction is processed and the passenger car thermal management system is controlled to restart after it is determined that the stop and maintenance time length of the passenger car thermal management system is greater than 50 s.

[0072] The shutdown control device of the passenger car thermal management system provided in the scheme of the present application determines different shutdown modes when the passenger car thermal management system operates in different modes, realizes stable shutdown of the passenger car thermal management system, effectively prevents abnormal wear of the compressor, and ensures system reliability of the passenger car thermal management system during shutdown.

[0073] Since the processing and functions realized by the device of the present embodiment are basically corresponding to the embodiments, principles, and examples of the foregoing method, details not described in the description of the present embodiment can be referred to the related descriptions in the foregoing embodiments, which are not described herein.

[0074] The technical scheme of the embodiment is adopted, the current operation mode of the passenger car thermal management system is determined, and the shutdown mode of the passenger car thermal management system under the current operation mode is determined according to the current operation mode of the passenger car thermal management system, the passenger car thermal management system is controlled to enter a shutdown first stage, a restart standby stage in turn, and shutdown is determined after shutdown is maintained for a preset shutdown duration, so that liquid hammer of the compressor is prevented, and the problem of abnormal wear of the compressor is avoided.

[0075] According to the embodiment of the present application, a passenger car corresponding to the shutdown control device of the passenger car thermal management system is also provided. The passenger car can include the above-mentioned shutdown control device of the passenger car thermal management system.

[0076] Since the processing and functions realized by the passenger car of the embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the descriptions of the embodiment that are not elaborated can be referred to the related descriptions in the foregoing embodiments, which will not be repeated here.

[0077] The technical scheme of the embodiment is adopted, the current operation mode of the passenger car thermal management system is determined, and the shutdown mode of the passenger car thermal management system under the current operation mode is determined according to the current operation mode of the passenger car thermal management system, the passenger car thermal management system is controlled to enter a shutdown first stage, a restart standby stage in turn, and shutdown is determined after shutdown is maintained for a preset shutdown duration, so that liquid hammer of the compressor is prevented, and the problem of abnormal wear of the compressor is avoided.

[0078] According to the embodiment of the present application, a storage medium corresponding to the shutdown control method of the passenger car thermal management system is also provided. The storage medium includes a stored program, wherein when the program runs, the device where the storage medium is located performs the above-mentioned shutdown control method of the passenger car thermal management system.

[0079] Since the processing and functions realized by the storage medium of the embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the descriptions of the embodiment that are not elaborated can be referred to the related descriptions in the foregoing embodiments, which will not be repeated here.

[0080] The technical scheme of the embodiment is adopted, the current operation mode of the passenger car thermal management system is determined, and the shutdown mode of the passenger car thermal management system under the current operation mode is determined according to the current operation mode of the passenger car thermal management system, the passenger car thermal management system is controlled to enter a shutdown first stage, a restart standby stage in turn, and shutdown is determined after shutdown is maintained for a preset shutdown duration, so that the normal delivery of lubricating oil is ensured.

[0081] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0082] The above merely provides the embodiments of the present application but are not intended to limit the present application. Changes can be made to the present application in various respects, such as in the suitable materials and dimensions for the components, the shapes and sizes of the components, and the assembly and arrangement of the components. It is thus understood that the scope of the application shall be subject to the appended claims.

Claims

1. A method of shutdown control of a thermal management system of a passenger vehicle, characterized by, The passenger car thermal management system comprises an air conditioning system and a battery liquid cooling system; the passenger car thermal management system can operate in any one of a single air conditioning mode, a single battery cooling mode and a battery cooling plus air conditioning mode; the single air conditioning mode is a mode in which the air conditioning system operates alone; the single battery cooling mode is a mode in which the battery liquid cooling system operates alone; the battery cooling plus air conditioning mode is a mode in which the air conditioning system and the battery liquid cooling system jointly operate; and the shutdown control method of the passenger car thermal management system comprises the following steps. Upon receiving a shutdown instruction of the passenger car thermal management system, the current operating mode of the passenger car thermal management system is determined; the current operating mode of the passenger car thermal management system is any one of the single air conditioning mode, the single battery cooling mode and the battery cooling plus air conditioning mode; According to the current operating mode of the passenger car thermal management system, the shutdown mode of the passenger car thermal management system in the current operating mode is determined; In the current operating mode of the passenger car thermal management system, the passenger car thermal management system is controlled to be shut down in the shutdown mode of the passenger car thermal management system in the current operating mode; The shutdown mode of the passenger car thermal management system in the current operating mode comprises the following steps: after receiving a shutdown instruction, the passenger car thermal management system is controlled to enter a first shutdown phase of the passenger car thermal management system in the current operating mode; after the first shutdown phase of the passenger car thermal management system in the current operating mode ends, the passenger car thermal management system is controlled to enter a restart standby phase of the passenger car thermal management system in the current operating mode; after the restart standby phase of the passenger car thermal management system in the current operating mode ends, the passenger car thermal management system is controlled to be shut down and kept until the shutdown keeping time of the passenger car thermal management system in the current operating mode reaches a preset shutdown time of the passenger car thermal management system in the current operating mode, and finally the passenger car thermal management system is determined to be shut down in the current operating mode.

2. The method of claim 1, wherein, In the case where the current operating mode is the single air conditioning mode, the passenger car thermal management system is controlled to enter the first shutdown phase of the passenger car thermal management system in the current operating mode, which comprises the following steps: the current operating frequency of a compressor is detected, and the target frequency of the compressor is determined according to whether the current operating frequency is greater than a first preset frequency; if the current operating frequency is greater than the first preset frequency, the target frequency of the compressor is the first preset frequency; if the current operating frequency is less than or equal to the first preset frequency, the target frequency of the compressor is the current operating frequency; in the case where the air conditioning expansion valve and the battery expansion valve maintain the current opening degree and the adjustment of the external fan gear position is set to the medium gear position, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a first preset time, and then the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are turned off, and the passenger car thermal management system exits the first shutdown phase of the passenger car thermal management system in the current operating mode; The control of the passenger car thermal management system into the restart standby phase of the passenger car thermal management system in the current operation mode includes: adjusting the opening degree of the air conditioning expansion valve to half of the air conditioning expansion valve opening degree in the separate air conditioning mode, and obtaining the external environment temperature; controlling the external fan gear position according to the external environment temperature; if the external environment temperature is less than or equal to a first preset temperature, the external fan remains in a closed state; if the external environment temperature is greater than the first preset temperature, the external fan is controlled to open the medium gear; after the passenger car thermal management system in the separate air conditioning mode enters the restart standby phase for a second preset time, the external fan is closed; and after the passenger car thermal management system in the separate air conditioning mode enters the restart standby phase for the first preset time, the air conditioning expansion valve is closed and the restart standby phase is exited or the restart standby phase is directly exited, wherein the second preset time is less than the first preset time.

3. The method of claim 1, wherein, In the case that the current operation mode is the separate battery cooling mode, the control of the passenger car thermal management system into the first shutdown phase of the passenger car thermal management system in the current operation mode includes: detecting the current operation frequency of the compressor, and determining the target frequency of the compressor according to whether the current operation frequency is greater than a second preset frequency; if the current operation frequency is greater than the second preset frequency, the target frequency of the compressor is the second preset frequency; if the current operation frequency is less than or equal to the second preset frequency, the target frequency of the compressor is the current operation frequency; in the case that the air conditioning expansion valve and the battery expansion valve maintain the current opening degree and the external fan gear position is adjusted to the medium gear, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a third preset time, and then the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are closed, and the passenger car thermal management system exits the first shutdown phase of the passenger car thermal management system in the current operation mode; The control of the passenger car thermal management system into the restart standby phase of the passenger car thermal management system in the current operation mode includes: the passenger car thermal management system exits the restart standby phase after the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are closed for a first preset time.

4. The method of claim 1, wherein, In a case where the current operation mode is the battery cooling and air conditioning mode, the passenger car thermal management system is controlled to enter a first shutdown stage of the passenger car thermal management system in the current operation mode, including: detecting a current operation frequency of the compressor, and determining a target frequency of the compressor according to whether the current operation frequency is greater than a third preset frequency; if the current operation frequency is greater than the third preset frequency, the target frequency of the compressor is the third preset frequency; if the current operation frequency is less than or equal to the third preset frequency, the target frequency of the compressor is the current operation frequency; in a case where the air conditioning expansion valve and the battery expansion valve maintain a current opening degree and the external fan is adjusted to a medium wind gear, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a first preset time, and then the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are turned off, and the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode; The passenger car thermal management system is controlled to enter a restart standby stage of the passenger car thermal management system in the current operation mode, including: adjusting the opening degree of the air conditioning expansion valve to half of the opening degree of the air conditioning expansion valve in the battery cooling and air conditioning mode, and simultaneously acquiring an external environment temperature, and controlling the gear of the external fan according to the external environment temperature; if the external environment temperature is less than or equal to a first preset temperature, the external fan remains in a closed state; if the external environment temperature is greater than the first preset temperature, the external fan is controlled to open a medium wind gear; after the passenger car thermal management system in the battery cooling and air conditioning mode enters the restart standby stage for a second preset time, the external fan is turned off, and until the passenger car thermal management system in the separate air conditioning mode enters the restart standby stage for the first preset time, the air conditioning expansion valve is turned off and the restart standby stage is exited or the restart standby stage is directly exited.

5. The method of claim 1 to 4, wherein, After the restart standby stage of the passenger car thermal management system in the current operation mode ends, the passenger car thermal management system is controlled to be kept in a shutdown state, and until the shutdown keeping time of the passenger car thermal management system in the current operation mode reaches a preset shutdown time of the passenger car thermal management system in the current operation mode, the passenger car thermal management system in the current operation mode is finally determined to be shut down, including: In a case where the current operation mode is the separate air conditioning mode, if a new start instruction is received again within the preset shutdown time during which the passenger car thermal management system is kept in a shutdown state, the new start instruction is not processed first, and the passenger car thermal management system is continued to be kept in a shutdown state, and after the passenger car thermal management system in the current operation mode is determined to be shut down, the new start instruction is processed. In a case where the current operation mode is the single battery cooling mode or the battery cooling plus air conditioning mode, within a preset shutdown duration of the passenger vehicle thermal management system shutdown maintenance, if a new start instruction is received again, it is determined whether the passenger vehicle thermal management system shutdown maintenance duration is greater than a fourth preset time, if the passenger vehicle thermal management system shutdown maintenance duration is greater than the fourth preset time, the passenger vehicle thermal management system is controlled to exit the shutdown maintenance, and the new start instruction is directly processed; if the passenger vehicle thermal management system shutdown maintenance duration is less than or equal to the fourth preset time, the new start instruction is not processed first, the passenger vehicle thermal management system is controlled to continue the shutdown maintenance, and the new start instruction is processed after it is determined that the passenger vehicle thermal management system shutdown maintenance duration is greater than the fourth preset time, wherein the fourth preset time is less than the preset shutdown duration.

6. A shutdown control device for a passenger vehicle thermal management system, characterized by, The passenger vehicle thermal management system comprises an air conditioning system and a battery liquid cooling system; the passenger vehicle thermal management system can operate in any one of a single air conditioning mode, a single battery cooling mode and a battery cooling plus air conditioning mode; the single air conditioning mode is a mode in which the air conditioning system operates alone; the single battery cooling mode is a mode in which the battery liquid cooling system operates alone; the battery cooling plus air conditioning mode is a mode in which the air conditioning system and the battery liquid cooling system jointly operate; the shutdown control device of the passenger vehicle thermal management system comprises: a control unit configured to determine a current operation mode of the passenger vehicle thermal management system when a shutdown instruction of the passenger vehicle thermal management system is received; the current operation mode of the passenger vehicle thermal management system is any one of the single air conditioning mode, the single battery cooling mode and the battery cooling plus air conditioning mode; the control unit is further configured to determine a shutdown manner of the passenger vehicle thermal management system in the current operation mode according to the current operation mode of the passenger vehicle thermal management system; the control unit is further configured to control the passenger vehicle thermal management system to shut down in the shutdown manner of the passenger vehicle thermal management system in the current operation mode under the current operation mode of the passenger vehicle thermal management system; wherein the shutdown manner of the passenger vehicle thermal management system in the current operation mode comprises: after the shutdown instruction is received, controlling the passenger vehicle thermal management system to enter a first shutdown phase of the passenger vehicle thermal management system in the current operation mode; after the first shutdown phase of the passenger vehicle thermal management system in the current operation mode ends, controlling the passenger vehicle thermal management system to enter a restart standby phase of the passenger vehicle thermal management system in the current operation mode; after the restart standby phase of the passenger vehicle thermal management system in the current operation mode ends, controlling the passenger vehicle thermal management system to shutdown maintain until the shutdown maintenance duration of the passenger vehicle thermal management system in the current operation mode reaches a preset shutdown duration of the passenger vehicle thermal management system in the current operation mode, and finally determining that the passenger vehicle thermal management system is shut down in the current operation mode.

7. The shutoff control device for a passenger vehicle thermal management system according to claim 6, characterized by, The control unit controls the passenger car thermal management system to enter a first shutdown stage of the passenger car thermal management system in the current operation mode, including: detecting a current operation frequency of the compressor, determining a target frequency of the compressor according to whether the current operation frequency is greater than a first preset frequency; if the current operation frequency is greater than the first preset frequency, the target frequency of the compressor is the first preset frequency; if the current operation frequency is less than or equal to the first preset frequency, the target frequency of the compressor is the current operation frequency; in the case that the air conditioning expansion valve and the battery expansion valve maintain a current opening degree and the adjustment of the outer fan gear position to a medium wind gear, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a first preset time, and then the compressor, the outer fan, the air conditioning expansion valve and the battery expansion valve are turned off, and the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode; The control unit controls the passenger car thermal management system to enter a first shutdown stage of the passenger car thermal management system in the current operation mode, including: detecting a current operation frequency of the compressor, determining a target frequency of the compressor according to whether the current operation frequency is greater than a first preset frequency; if the current operation frequency is greater than the first preset frequency, the target frequency of the compressor is the first preset frequency; if the current operation frequency is less than or equal to the first preset frequency, the target frequency of the compressor is the current operation frequency; in the case that the air conditioning expansion valve and the battery expansion valve maintain a current opening degree and the adjustment of the outer fan gear position to a medium wind gear, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a first preset time, and then the compressor, the outer fan, the air conditioning expansion valve and the battery expansion valve are turned off, and the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode; 8. The shutoff control device for a passenger vehicle thermal management system according to claim 6, characterized by, The control unit controls the passenger car thermal management system to enter a first shutdown stage of the passenger car thermal management system in the current operation mode, including: detecting a current operation frequency of the compressor, determining a target frequency of the compressor according to whether the current operation frequency is greater than a first preset frequency; if the current operation frequency is greater than the first preset frequency, the target frequency of the compressor is the first preset frequency; if the current operation frequency is less than or equal to the first preset frequency, the target frequency of the compressor is the current operation frequency; in the case that the air conditioning expansion valve and the battery expansion valve maintain a current opening degree and the adjustment of the outer fan gear position to a medium wind gear, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a first preset time, and then the compressor, the outer fan, the air conditioning expansion valve and the battery expansion valve are turned off, and the passenger car thermal management system exits the first shutdown stage of the passenger car thermal management system in the current operation mode; The control unit controls the passenger car thermal management system to enter a restart standby phase of the passenger car thermal management system in the current operation mode, including: after the passenger car thermal management system turns off the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve for a first preset time, the passenger car thermal management system exits the restart standby phase.

9. The shutoff control device for a passenger car thermal management system according to claim 6, characterized by, The control unit controls the passenger car thermal management system to enter a first shutdown phase of the passenger car thermal management system in the current operation mode, including: detecting a current operation frequency of the compressor, determining a target frequency of the compressor according to whether the current operation frequency is greater than a third preset frequency; if the current operation frequency is greater than the third preset frequency, the target frequency of the compressor is the third preset frequency; if the current operation frequency is less than or equal to the third preset frequency, the target frequency of the compressor is the current operation frequency; in the case that the air conditioning expansion valve and the battery expansion valve maintain the current opening degree and the external fan is adjusted to the medium gear, the passenger car thermal management system is controlled to operate at the target frequency of the compressor for a first preset time, and then the compressor, the external fan, the air conditioning expansion valve and the battery expansion valve are turned off, and the passenger car thermal management system exits the first shutdown phase of the passenger car thermal management system in the current operation mode. The control unit controls the passenger car thermal management system to enter a restart standby phase of the passenger car thermal management system in the current operation mode, including: adjusting the opening degree of the air conditioning expansion valve to half of the opening degree of the air conditioning expansion valve in the battery cooling and air conditioning mode, and obtaining an external environment temperature, and controlling the gear of the external fan according to the external environment temperature; if the external environment temperature is less than or equal to a first preset temperature, the external fan remains in a closed state; if the external environment temperature is greater than the first preset temperature, the external fan is controlled to open the medium gear; after the passenger car thermal management system in the battery cooling and air conditioning mode enters the restart standby phase for a second preset time, the external fan is turned off, and then the air conditioning expansion valve is turned off and the restart standby phase is exited or the restart standby phase is directly exited after the passenger car thermal management system in the separate air conditioning mode enters the restart standby phase for the first preset time.

10. The shut-down control device of a passenger vehicle thermal management system according to any one of claims 6 to 9, characterized in that, The control unit controls the passenger car thermal management system to stop and keep after the restart standby phase of the passenger car thermal management system in the current operation mode ends, and then controls the passenger car thermal management system to finally determine shutdown in the current operation mode after the stop and keep time of the passenger car thermal management system in the current operation mode reaches a preset shutdown time of the passenger car thermal management system in the current operation mode. In the case where the current operation mode is the single air conditioner mode, if a new start instruction is received again within the preset shutdown duration during which the passenger car thermal management system is controlled to remain shutdown, the new start instruction is not processed first, and the passenger car thermal management system is controlled to remain shutdown until it is determined that the passenger car thermal management system is shutdown in the current operation mode, and then the new start instruction is processed. In the case where the current operation mode is the single battery cooling mode or the battery cooling plus air conditioner mode, if a new start instruction is received again within the preset shutdown duration during which the passenger car thermal management system is controlled to remain shutdown, it is determined whether the shutdown duration of the passenger car thermal management system is greater than a fourth preset time. If the shutdown duration of the passenger car thermal management system is greater than the fourth preset time, the passenger car thermal management system is controlled to exit the shutdown, and the new start instruction is processed directly. If the shutdown duration of the passenger car thermal management system is less than or equal to the fourth preset time, the new start instruction is not processed first, and the passenger car thermal management system is controlled to remain shutdown until it is determined that the shutdown duration of the passenger car thermal management system is greater than the fourth preset time, and then the new start instruction is processed. The fourth preset time is less than the preset shutdown duration.

11. A passenger vehicle characterized by The application further provides a passenger car thermal management system shutdown control device. The storage medium comprises a stored program, wherein the program controls the device in which the storage medium is located to perform the passenger car thermal management system shutdown control method according to any one of claims 1 to 5 when the program is executed.

12. A storage medium, characterized by The application further provides a storage medium.

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