Vehicle thermal management system, control method and equipment thereof and storage medium

Abstract

The invention relates to the technical field of vehicle heat management, and discloses a vehicle heat management system and a control method and device thereof and a storage medium, the vehicle heat management system comprises a heat pump loop, and a first refrigeration branch and a second refrigeration branch which are connected with the heat pump loop in parallel, and the method comprises the steps that the current environment temperature of the environment where a vehicle is located is obtained, the current pressure of an outlet of the compressor; if the current environment temperature is lower than the preset temperature and the current pressure is lower than the preset pressure, the vehicle heat management system is controlled to work in a preset refrigerant pumping mode, so that a refrigerant in a first refrigeration branch and / or a second refrigeration branch is pumped into a heat pump loop; and after the refrigerant pumping mode is completed, the vehicle heat management system is controlled to work in a heat pump mode, so that a passenger compartment of the vehicle is warmed through a heat pump loop. Therefore, before the heat pump mode, the refrigerants in the other branches are extracted into the heat pump loop, the heat pump mode can be successfully started at a time, and the refrigerants cannot be lacked in the heat pump mode.

Description

Technical Field

[0001] The present application relates to the field of vehicle thermal management technology, and in particular to a vehicle thermal management system and a control method, device and storage medium thereof. Background Art

[0002] As part of the vehicle thermal management system, the heat pump air conditioning system can heat the passenger compartment in a low-temperature environment to meet the user's heating needs. The refrigerant used in the heat pump air conditioning system is generally a low-temperature refrigerant, which enables the heat pump system to operate at a lower ambient temperature.

[0003] When the vehicle is at a low ambient temperature, the refrigerant is basically saturated and liquid is dominant. At this time, the refrigerant will flow into various components or pipes of the thermal management system. For example, the "U" type is most likely to collect liquid. At this time, if the heat pump system is to be started, the refrigerant in the heat pump cycle will be too little, resulting in a startup failure. Even if there is no startup failure, the heat pump system will lack refrigerant when working under high load, resulting in too low low pressure, causing low pressure protection, low compressor speed, and poor heating effect. Summary of the invention

[0004] In view of the above problems, the present application provides a vehicle thermal management system and its control method, equipment and storage medium. Before the heat pump mode, the refrigerant in other branches is extracted into the heat pump circuit, which can make the heat pump mode start successfully at one time and there will be no shortage of refrigerant in the heat pump mode.

[0005] On the one hand, the present application provides a control method for a vehicle thermal management system, which is applied to a vehicle thermal management system, wherein the vehicle thermal management system includes a heat pump circuit, and a first refrigeration branch and a second refrigeration branch respectively connected in parallel with part of the pipelines of the heat pump circuit, and the method includes: obtaining the current ambient temperature of the vehicle's environment, and obtaining the current pressure of the compressor outlet in the heat pump circuit; if the current ambient temperature is lower than a preset temperature and the current pressure is lower than a preset pressure, controlling the vehicle thermal management system to operate in a preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit; after the vehicle thermal management system completes operating in the refrigerant extraction mode, controlling the vehicle thermal management system to operate in a heat pump mode to heat the vehicle's passenger compartment through the heat pump circuit.

[0006] In some specific embodiments, the step of controlling the vehicle thermal management system to operate in a preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit includes: controlling the first refrigeration branch to be connected with one of the second refrigeration branches, and controlling the compressor in the heat pump circuit to operate so as to extract the refrigerant in the connected refrigeration branch into the heat pump circuit; when it is detected that the conduction time of the connected refrigeration branch reaches a first preset time length, controlling the first refrigeration branch to be connected with the other of the second refrigeration branch to extract the refrigerant in the first refrigeration branch and the second refrigeration branch into the heat pump circuit.

[0007] In some specific embodiments, after detecting that the conduction time of the turned-on refrigeration branch reaches a first preset time length, controlling the other of the first refrigeration branch and the second refrigeration branch to be turned on to extract the refrigerant in the first refrigeration branch and the second refrigeration branch into the heat pump circuit, the method includes: detecting that the time when the first refrigeration branch and the second refrigeration branch are both in the conduction state reaches a second preset time length, controlling one of the first refrigeration branch and the second refrigeration branch to be turned off and the compressor to stop working, so as to end the refrigerant extraction mode.

[0008] In some specific embodiments, the step of controlling the conduction between the first refrigeration branch and the second refrigeration branch includes: controlling the conduction between the first refrigeration branch and the second refrigeration branch with the larger predicted refrigerant amount; wherein the predicted refrigerant amount is a pre-measured refrigerant amount when the refrigeration branch is not working; or, detecting the current refrigerant amount in the first refrigeration branch and the second refrigeration branch, and controlling the conduction of the refrigeration branch with the larger current refrigerant amount.

[0009] In some specific embodiments, after the vehicle thermal management system has completed working in the refrigerant extraction mode, the step of controlling the vehicle thermal management system to work in the heat pump mode to heat the vehicle's passenger compartment through a heat pump circuit includes: after the vehicle thermal management system has completed working in the refrigerant extraction mode, controlling the vehicle thermal management system to work in a preset heat pump pre-preparation mode to release the exhaust pressure of the compressor through the heat pump pre-preparation mode and prepare for the opening of the valve body when the vehicle thermal management system works in the heat pump mode; after the thermal management system has completed working in the heat pump pre-preparation mode, controlling the vehicle thermal management system to enter the heat pump mode to heat the vehicle's passenger compartment through a heat pump circuit.

[0010] In some specific embodiments, the inlet of the first refrigeration branch is connected to the outlet of the built-in condenser of the heat pump branch, the inlet of the second refrigeration branch is connected to the outlet of the compressor, and the outlets of the first refrigeration branch and the second refrigeration branch are both connected to the inlet of the liquid storage bottle in the heat pump circuit; the heat pump circuit is provided with a first valve body between the inlet and the outlet of the first refrigeration branch, and the first valve body is closed in the refrigerant extraction mode; the heat pump circuit is provided with a second valve body between the liquid storage bottle and the heat exchanger, and the second valve body is opened in the refrigerant extraction mode; the step of controlling the vehicle thermal management system to operate in a preset pre-heat pump preparation mode to release the exhaust pressure of the compressor through the pre-heat pump preparation mode, and preparing for the opening of the valve body when the vehicle thermal management system operates in the heat pump mode includes: controlling one of the first refrigeration branch or the second refrigeration branch to operate at a first preset opening to release the exhaust pressure of the compressor, and controlling the corresponding branch to shut down when it operates at the first preset opening for a third preset time; controlling the first valve body to open after a fourth preset time interval after the compressor is turned off, and controlling the opening of the second valve body to be adjusted to a second preset opening.

[0011] In some specific embodiments, after the vehicle thermal management system completes working in the refrigerant extraction mode, the step of controlling the vehicle thermal management system to work in the heat pump mode to heat the vehicle's passenger compartment through the heat pump circuit includes: when the vehicle thermal management system works in the heat pump mode, detecting the current speed of the compressor and the current inlet pressure of the compressor inlet in the heat pump circuit; if the current speed is less than the preset speed and the current inlet pressure is less than the preset standard pressure, controlling the thermal management system to enter the refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit.

[0012] On the other hand, the present application provides a vehicle thermal management system, including: a heat pump circuit, provided with a compressor, a built-in condenser and a liquid storage bottle; a first refrigeration branch, the inlet of which is connected to the outlet of the compressor, and the outlet of which is connected to the liquid storage bottle; a second refrigeration branch, the inlet of which is connected to the outlet of the built-in condenser, and the outlet of which is connected to the liquid storage bottle; a control device, used to obtain the current ambient temperature of the vehicle's environment and the current pressure of the compressor outlet in the heat pump circuit; if the current ambient temperature is lower than the preset temperature and the current pressure is lower than the preset pressure, the vehicle thermal management system is controlled to operate in a preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit; after the vehicle thermal management system completes operating in the refrigerant extraction mode, the vehicle thermal management system is controlled to operate in a heat pump mode to heat the vehicle's passenger compartment through the heat pump circuit.

[0013] On the other hand, the present application provides an electronic device, including: a processor; a memory for storing a computer program, and when the computer program is executed by the processor, any of the above-mentioned vehicle thermal management system control methods is implemented.

[0014] On the other hand, the present application provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the control method of the vehicle thermal management system as described above is implemented.

[0015] The present application has at least the following beneficial technical effects: Based on the vehicle thermal management system and its control method, device and storage medium provided by the present application, the method is applied to the vehicle thermal management system, the vehicle thermal management system includes a heat pump circuit, and a first refrigeration branch and a second refrigeration branch respectively connected in parallel with part of the pipelines of the heat pump circuit, and the method includes: obtaining the current ambient temperature of the environment in which the vehicle is located, and obtaining the current pressure of the compressor outlet in the heat pump circuit; if the current ambient temperature is lower than the preset temperature and the current pressure is lower than the preset pressure, the vehicle thermal management system is controlled to work in a preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit; after the vehicle thermal management system has completed working in the refrigerant extraction mode, the vehicle thermal management system is controlled to work in the heat pump mode to heat the passenger compartment of the vehicle through the heat pump circuit. Therefore, before the heat pump mode, extracting the refrigerant in other branches into the heat pump circuit can enable the heat pump mode to be successfully started once, and there will be no shortage of refrigerant in the heat pump mode.

[0016] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0018] Figure 1 It is a piping schematic diagram of an embodiment of a vehicle thermal management system provided by the present application;

[0019] Figure 2 yes Figure 1 A schematic diagram of a heat pump circuit, a first refrigeration branch and a second refrigeration branch;

[0020] Figure 3 yes Figure 2 Schematic diagram of the heat pump circuit;

[0021] Figure 4 It is a flow chart of an embodiment of a control method of a vehicle thermal management system provided by the present application;

[0022] Figure 5is a flow chart of another embodiment of a control method for a vehicle thermal management system provided by the present application;

[0023] Figure 6 is a flow chart of another embodiment of a control method for a vehicle thermal management system provided by the present application;

[0024] Figure 7 is a flow chart of another embodiment of a control method for a vehicle thermal management system provided by the present application;

[0025] Figure 8 is a flow chart of another embodiment of a control method for a vehicle thermal management system provided by the present application;

[0026] Fig. 9 is a flow chart of another embodiment of a control method for a vehicle thermal management system provided by the present application;

[0027] Fig.10 is a flow chart of another embodiment of a control method for a vehicle thermal management system provided by the present application;

[0028] Fig.11 It is a schematic diagram of the structural framework of an embodiment of the electronic device provided by the present application;

[0029] Fig.12 It is a schematic diagram of the structural framework of an embodiment of the computer-readable storage medium provided by the present application. DETAILED DESCRIPTION

[0030] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0031] If there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0032] The present application embodiment first provides a vehicle thermal management system, Figure 1 is a schematic diagram of a pipeline of an embodiment of a vehicle thermal management system provided by the present application, Figure 2 yes Figure 1 Schematic diagram of the heat pump circuit, the first refrigeration branch and the second refrigeration branch. Figure 3 yes Figure 2 Schematic diagram of the heat pump circuit.

[0033] like Figure 1-Figure 3 As shown, the vehicle thermal management system includes a heat pump circuit. When the vehicle thermal management system operates in heat pump mode, the heat pump circuit works to heat the passenger compartment. A compressor Y is provided in the heat pump circuit. When the compressor Y works, it converts the high-temperature and high-pressure gaseous refrigerant introduced into its inlet into a gaseous refrigerant with a lower temperature and lower pressure. The refrigerant passes through the seventh expansion valve E7 and is introduced into the front HVAC (i.e., the front air conditioning box). The refrigerant dissipates heat through the condenser LN in the front HVAC, and the condenser LN dissipates heat to heat the passenger compartment.

[0034] Furthermore, the refrigerant becomes a gas-liquid mixture after dissipating heat through the condenser LN in the front HVAC, and then enters the refrigerant side L of the first heat exchanger HS1 after passing through the throttle valve S1, the liquid storage bottle CY, the first coaxial tube T1 and the second expansion valve body E2 in sequence. The refrigerant on the refrigerant side L absorbs heat from the electric drive module or the air through heat exchange with the water side W, so that the refrigerant derived from the refrigerant side L of the first heat exchanger HS1 is mainly in a gaseous state. The refrigerant finally enters the second coaxial tube T2 for gas-liquid filtration, so that the refrigerant that finally enters the compressor is mainly in a gaseous state, thereby realizing the circulation of the refrigerant to heat the passenger compartment. Therefore, in the heat pump circuit, the heat of the electric drive module or the air is actually absorbed by the first heat exchanger HS1, and the heat is released through the front HVAC to heat the passenger compartment.

[0035] Combination Figure 1The first heat exchanger HS1 is provided with a water side W, which is connected to the thermal management pipeline of the electric drive module, so that the coolant that absorbs the residual heat of the electric drive module can exchange heat with the refrigerant on the refrigerant side L through the water side W, providing a heat source for heating the passenger compartment while achieving its own heat dissipation. Among them, the vehicle thermal management system also includes a low-temperature radiator, which is connected to the thermal management pipeline of the electric drive module. The heat of the electric drive module is dissipated in the low-temperature radiator through the coolant, thereby ensuring the heat dissipation function of the electric drive module to enable it to work normally.

[0036] Combination Figure 2 The vehicle thermal management system further includes a first refrigeration branch and a second refrigeration branch, the first refrigeration branch is connected in parallel with the BD section in the heat pump circuit, and the second refrigeration branch is connected in parallel with the AD section in the heat pump circuit. Figure 1 as well as Figure 2 , a second heat exchanger HS2 is provided in the second refrigeration branch, and the second refrigeration branch flows through the refrigerant side L of the second heat exchanger HS2. The refrigerant on the refrigerant side L of the second heat exchanger HS2 absorbs the heat of the coolant in the water side W of the second heat exchanger HS2, thereby reducing the water temperature of the coolant flowing through the water side L. When the coolant with a lower temperature flows through the battery pack, it dissipates heat for the battery pack to ensure the normal operation of the battery pack. It should be understood that the two four-way valves shown in the figure are the first four-way valve M1 and the second four-way valve M2. The figure only shows two connection modes of each port of the first four-way valve M1 and the second four-way valve M2. In the actual circulation process, the connection mode between each port can be controlled according to actual needs.

[0037] The battery pack can be heated by absorbing heat from the water side W in the first heat exchanger HS1, and then dissipating the heat of the battery pack through the waste heat of the electric drive module. Of course, a PTC heater can also be set in the battery pack heating branch, and then the coolant in the circuit can be heated by the PTC heater, and then the battery pack can be heated by the heated coolant.

[0038] Combination Figure 2 The first refrigeration branch is provided with a condenser LN, and the condenser LN in the second refrigeration branch and the condenser LN in the heat pump circuit are two different types of condensers. The condenser in the heat pump circuit is used to dissipate heat to heat the passenger compartment, while the condenser LN in the first refrigeration branch dissipates heat to dissipate the heat in the refrigerant to the outside of the vehicle, thereby reducing the temperature of the refrigerant, and then enters the evaporator ZF (i.e., the evaporator of the front HVAC) in the EH pipeline to absorb heat, thereby cooling the passenger compartment.

[0039] In summary, the first refrigeration branch is actually a part of the air-conditioning refrigeration circuit, and the second refrigeration branch is actually a part of the battery pack refrigeration circuit. When the vehicle management system works in heat pump mode, the heat pump circuit is used to heat the passenger compartment, but the first refrigeration branch and the second refrigeration branch generally do not work. Under lower ambient temperatures, more refrigerant may be stored in the first refrigeration branch and the second refrigeration branch, while the refrigerant in the heat pump circuit may be less. Based on this situation, the heat pump mode may fail to start in a low temperature environment, or the amount of refrigerant in the heat pump circuit may be insufficient after successful startup, resulting in poor heating effect for the passenger compartment in heat pump mode.

[0040] Based on the structure of the above-mentioned vehicle thermal management system and related technical problems, the present application provides a control method for a vehicle thermal management system, which is applied to the vehicle thermal management system in the above-mentioned embodiment to solve the related technical problems.

[0041] Figure 4 FIG. 1 is a flow chart of an embodiment of a control method of a vehicle thermal management system provided by the present application. Figure 4 , the method comprises the following steps:

[0042] S101: Acquire the current ambient temperature of the environment in which the vehicle is located, and acquire the current pressure of the compressor outlet in the heat pump circuit.

[0043] Specifically, the vehicle may be provided with an ambient temperature sensor to obtain the ambient temperature of the environment in which the vehicle is located in real time through the ambient temperature sensor. The current ambient temperature of the vehicle's location may also be obtained through the vehicle controller in combination with the location information of the vehicle and the weather information (including ambient temperature) of the location.

[0044] A pressure detection device may be provided on the outlet side of the compressor, and the pressure at the compressor outlet may be detected in real time by the pressure detection device. It should be understood that the current pressure at the compressor outlet, i.e., the current pressure of the compressor outlet pipeline, is related to factors such as the state and amount of the refrigerant in the compressor outlet pipeline.

[0045] S102: If the current ambient temperature is lower than the preset temperature and the current pressure is lower than the preset pressure, the vehicle thermal management system is controlled to operate in a preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit.

[0046] The preset temperature can be pre-set according to actual needs. When the current ambient temperature is lower than the preset temperature, the refrigerant in the first refrigeration branch and the second refrigeration branch will generally accumulate more. The preset pressure is also pre-set according to actual needs. When the current pressure is lower than the preset pressure, it means that the compressor has been shut down for a long time. At this time, the heat pump mode is started as a cold start.

[0047] In some application scenarios, the preset temperature may be 0° C., and the preset pressure may be 10 bar, but this is not limiting.

[0048] Therefore, if the current ambient temperature is lower than the preset temperature and the current pressure is lower than the preset pressure, the vehicle thermal management system is controlled to work in heat pump mode, and the vehicle thermal management system will cold start the heat pump mode in a low temperature environment. It is easy for the heat pump mode to fail to start due to insufficient refrigerant, or it is easy for insufficient refrigerant to start in the heat pump mode after successful startup.

[0049] In order to solve the above technical problems, the present embodiment pre-sets a refrigerant extraction mode, so that the vehicle thermal management system extracts the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit in the refrigerant extraction mode. By extracting the refrigerant accumulated in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit, the amount of refrigerant in the heat pump circuit can be increased, thereby preventing the heat pump mode from starting up due to insufficient refrigerant, or preventing poor heating effect in the heat pump mode.

[0050] It should be understood that this embodiment extracts the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit, that is, there are three possibilities: only extracting the refrigerant in the first refrigeration branch into the heat pump circuit, only extracting the refrigerant in the second refrigeration branch into the heat pump circuit, and extracting the refrigerant in both the first refrigeration branch and the second refrigeration branch into the heat pump circuit.

[0051] S103: After the vehicle thermal management system has completed working in the refrigerant extraction mode, the vehicle thermal management system is controlled to work in the heat pump mode to heat the passenger compartment of the vehicle through the heat pump circuit.

[0052] After the vehicle thermal management system completes the refrigerant extraction mode, the amount of refrigerant in the heat pump circuit is generally sufficient. At this time, if the vehicle thermal management system starts the heat pump mode, it can generally be started successfully at one time, and even if it works at a higher load in the subsequent process, it will ensure that the amount of refrigerant is sufficient, and will not cause the problem of poor heating effect due to lack of refrigerant.

[0053] Figure 5 It is a flow chart of another embodiment of the control method of the vehicle thermal management system provided by the present application.

[0054] Combination Figure 5 In some specific embodiments, the step of controlling the vehicle thermal management system to operate in a preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit includes:

[0055] S201: Control one of the first refrigeration branch and the second refrigeration branch to be connected, and control the compressor in the heat pump circuit to operate, so as to extract the refrigerant in the connected refrigeration branch into the heat pump circuit.

[0056] It should be understood that in this embodiment, when this step is performed, the vehicle thermal management system works in a preset refrigerant extraction mode. In the initial stage of the refrigerant extraction mode, the pressure provided by the compressor is actually insufficient to support the extraction of refrigerant from multiple branches, so only the refrigerant from one branch is extracted in the initial stage.

[0057] This embodiment controls the conduction of one of the first refrigeration branch and the second refrigeration branch, which can be to control the conduction of the first refrigeration branch or to control the conduction of the second refrigeration branch, without specific limitation. When controlling the conduction of the first refrigeration branch or the second refrigeration branch, the opening of the branch conduction can be controlled. In combination with the above content, the third expansion valve E3 can be controlled to control the opening of the first refrigeration branch, and the fourth expansion valve E4 can be controlled to control the opening of the second refrigeration branch.

[0058] When the compressor in the heat pump circuit is controlled to work, it can provide power for extracting refrigerant, so as to extract the refrigerant in the first refrigeration branch or the second refrigeration branch that is connected into the heat pump circuit. In some application scenarios, the speed of the compressor can be set to a lower speed, for example, it can be set to 800 rpm.

[0059] Furthermore, when one of the first refrigeration branch and the second refrigeration branch is controlled to be connected in the refrigerant extraction mode, the pipe section in the heat pump circuit of the connected first refrigeration branch or the second refrigeration branch can be controlled to be closed. For example, whether the first refrigeration branch or the second refrigeration branch is controlled to be connected, the throttle valve S1 can be controlled to be closed, thereby shutting down the pipe section BD in the heat pump circuit. Among them, when controlling the connection of the first refrigeration branch, it is necessary to control the connection of the seventh expansion valve E7, and when only controlling the connection of the second refrigeration branch, the seventh expansion valve E7 can be closed or opened. For the convenience of control, the seventh expansion valve E7 can be kept open in the refrigerant extraction mode. In order to make the extraction of refrigerant smoother, the second expansion valve E2 in the heat pump circuit also needs to be opened. At this time, the valve bodies in other branches do not need to be opened, for example, the first expansion valve E1 and the sixth expansion valve E6 are both closed.

[0060] S202: When it is detected that the conduction time of the conducted refrigeration branch reaches a first preset time length, the other of the first refrigeration branch and the second refrigeration branch is controlled to be conducted, so as to extract the refrigerant in the first refrigeration branch and the second refrigeration branch into the heat pump circuit.

[0061] The first preset duration can be set according to the specific parameters of the vehicle and actual needs. When the conduction time of the conducted branch reaches the first preset duration, the compressor can provide a relatively large pressure and can extract the refrigerant in the two branches at the same time. At this time, in order to extract more refrigerant into the heat pump circuit, the first refrigeration branch and the other of the second refrigeration branches are controlled to be conducted to simultaneously extract the refrigerant in the first refrigeration branch and the second refrigeration branch. Combined with the above content, since the first refrigeration branch needs to be conducted at this time, the seventh expansion valve E7 needs to be conducted.

[0062] Figure 6 It is a flow chart of another embodiment of the control method of the vehicle thermal management system provided by the present application.

[0063] Combination Figure 6 In some specific embodiments, after detecting that the conduction time of the conducted refrigeration branch reaches a first preset time length, controlling the other of the first refrigeration branch and the second refrigeration branch to conduct, so as to extract the refrigerant in the first refrigeration branch and the second refrigeration branch into the heat pump circuit, that is, after the above step S202, the method includes:

[0064] S301: When it is detected that the time during which the first refrigeration branch and the second refrigeration branch are both in the on state reaches a second preset time length, one of the first refrigeration branch and the second refrigeration branch is controlled to be turned off and the compressor is stopped to end the refrigerant extraction mode.

[0065] The second preset duration can be pre-set according to actual needs. When the time when both the first refrigeration branch and the second refrigeration branch are in the on state reaches the second preset duration, it actually means that the on time of the later one of the first refrigeration branch and the second refrigeration branch reaches the second preset duration. For example, the first refrigeration branch works for the first preset duration first, and then the second refrigeration branch works. Then, when the time when both the first refrigeration branch and the second refrigeration branch are in the on state reaches the second preset duration, it means that the time when the second refrigeration branch is in the on state reaches the second preset duration.

[0066] When the time when both the first refrigeration branch and the second refrigeration branch are in the on state reaches the second preset time length, it means that enough refrigerant has been extracted into the heat pump circuit, and it is not necessary to continue the refrigerant extraction mode. At this time, the refrigerant extraction mode is terminated by controlling one of the first refrigeration branch and the second refrigeration branch to be turned off and the compressor to stop working.

[0067] It should be understood that the purpose of controlling the compressor to stop working is to no longer provide pressure for extracting refrigerant, and the purpose of controlling one of the first refrigeration branch and the second refrigeration branch to shut down is to facilitate entering the following heat pump pre-preparation mode.

[0068] Figure 7It is a flow chart of another embodiment of the control method of the vehicle thermal management system provided by the present application.

[0069] Combination Figure 7 In some specific embodiments, the step of controlling the conduction between the first refrigeration branch and the second refrigeration branch includes:

[0070] S401: Controlling the first refrigeration branch and the second refrigeration branch, whichever has a larger predicted refrigerant volume, to be turned on; wherein the predicted refrigerant volume is a pre-measured refrigerant volume when the refrigeration branch is not working.

[0071] It should be understood that step S401 and step S402 are two parallel steps, and the sequence numbers of the steps do not limit the execution order.

[0072] It should be understood that the above embodiment does not make specific restrictions on the first refrigeration branch and the second refrigeration branch. The first refrigeration branch can be a part of the air-conditioning refrigeration circuit and any one of the battery pack refrigeration circuits, and the second refrigeration branch is the other.

[0073] In this embodiment, the first refrigeration branch and the second refrigeration branch are controlled to be connected to the one with the larger predicted refrigerant amount. In combination with the above content, if the first refrigeration branch is part of the air conditioning refrigeration circuit, and the second refrigeration branch is part of the battery pack refrigeration circuit, then the predicted refrigerant amount in the first refrigeration branch is greater than the predicted refrigerant amount in the second refrigeration branch, then the first refrigeration branch is controlled to be connected.

[0074] In some application scenarios, if the first refrigeration branch as part of the air conditioning refrigeration circuit is turned on first, the opening of the third expansion valve E3 can be controlled to be 100 steps (less than one tenth of the maximum opening of the third expansion valve E3). In combination with the above content, the first preset time can be set to 30S. When the second refrigeration branch is turned on, the number of steps of the fourth expansion valve E4 in the second refrigeration branch can be controlled to be 100 steps, and the second preset time can be set to 20S.

[0075] S402: Detect the current refrigerant amount in the first refrigeration branch and the second refrigeration branch, and control the refrigeration branch with the larger current refrigerant amount to be turned on.

[0076] In another embodiment, the refrigerant amount of the first refrigeration branch and the second refrigeration branch can be detected in real time to obtain the current refrigerant amount. Then, the refrigeration branch with a larger refrigerant amount is controlled to be turned on. For example, when it is detected in real time that the current refrigerant amount of the first refrigeration branch is larger, the first refrigeration branch is controlled to be turned on first.

[0077] It should be understood that in the above two methods, whether controlling the one with a larger predicted refrigerant amount or controlling the one with a larger current refrigerant amount, the one with a larger refrigerant amount is controlled to work. By controlling the one with a larger refrigerant amount to work, the refrigerant in the refrigeration branch with a larger refrigerant amount can be fully extracted, and generally there will be no situation where no refrigerant is extracted in the later stage of the refrigerant extraction mode, thereby extracting more refrigerant into the heat pump circuit.

[0078] Figure 8 It is a flow chart of another embodiment of the control method of the vehicle thermal management system provided by the present application.

[0079] Combination Figure 8 In some specific embodiments, after the vehicle thermal management system has completed working in the refrigerant extraction mode, the step of controlling the vehicle thermal management system to work in the heat pump mode to heat the passenger compartment of the vehicle through the heat pump circuit, i.e., the above-mentioned step S103, includes:

[0080] S501: After the vehicle thermal management system has completed working in the refrigerant extraction mode, the vehicle thermal management system is controlled to work in a preset pre-heat pump preparation mode to release the exhaust pressure of the compressor through the pre-heat pump preparation mode and prepare for the opening of the valve body when the vehicle thermal management system works in the heat pump mode.

[0081] In this embodiment, after the vehicle thermal management system completes working in the refrigerant extraction mode, it does not directly enter the heat pump mode, but first enters the heat pump pre-preparation mode, and then enters the heat pump mode after the heat pump pre-preparation mode is completed.

[0082] The heat pump pre-preparation mode is a preset mode. This embodiment does not limit the specific control method of this mode, but defines the function of this mode as releasing the exhaust pressure of the compressor and preparing for the opening of the valve body in the heat pump mode.

[0083] It should be understood that even if the compressor is controlled to shut down at the end of the refrigerant extraction mode, there will still be a certain pressure at the compressor outlet. Combined with the above content, in the heat pump mode, the first refrigeration branch and the second refrigeration branch will be shut down, and the heat pump circuit will be opened to circulate the refrigerant. In the refrigerant extraction mode and the heat pump pre-preparation mode, the throttle valve S1 will always be in a closed state. In the heat pump mode, in order to allow the refrigerant to circulate in the heat pump circuit, the throttle valve S1 needs to be opened. However, if the pressure is not released in the heat pump pre-preparation mode, it is very likely that when the throttle valve S1 is opened when the heat pump mode is started, the valve body will make abnormal noises due to excessive pressure, affecting the user experience. In addition, by preparing for the opening of the valve body, the valve body can be quickly adjusted to the corresponding opening in the heat pump mode, thereby reducing the time for the valve body to be opened in the heat pump mode, thereby achieving a better heating effect.

[0084] S502: After the thermal management system has completed working in the heat pump pre-preparation mode, the vehicle thermal management system is controlled to enter the heat pump mode to heat the vehicle's passenger compartment through the heat pump circuit.

[0085] After the thermal management system completes working in the heat pump preparation mode, it enters the heat pump mode for heating, which can avoid abnormal noise from related valves and improve the heating effect in the heat pump mode.

[0086] Combined with the above-mentioned vehicle thermal management system, in some specific embodiments, the inlet of the first refrigeration branch is connected to the outlet of the built-in condenser of the heat pump branch (i.e., the condenser of the front HVAC), the inlet of the second refrigeration branch is connected to the outlet of the compressor, and the outlets of the first refrigeration branch and the second refrigeration branch are both connected to the inlet of the liquid storage bottle CY in the heat pump circuit. At this time, the first refrigeration branch is the branch of the BD section, that is, a part of the air conditioning refrigeration circuit, and the second refrigeration branch is the branch of the AD section, that is, a part of the battery pack refrigeration circuit.

[0087] The heat pump circuit is provided with a first valve body between the inlet and outlet of the first refrigeration branch, and the first valve body is closed in the refrigerant extraction mode. In combination with the above content, the first valve body is the throttle valve S1 in the above content. The heat pump circuit is provided with a second valve body between the liquid storage bottle and the heat exchanger, and the second valve body is opened in the refrigerant extraction mode. In combination with the above content, the second valve body is the second expansion valve E2.

[0088] In combination with the specific configuration of the first refrigeration branch, the second refrigeration branch, the first valve body and the second valve body, the present application provides a specific control method for the heat pump pre-preparation mode:

[0089] Fig. 9 It is a flow chart of another embodiment of the control method of the vehicle thermal management system provided by the present application.

[0090] Combination Fig. 9 The step of controlling the vehicle thermal management system to operate in a preset pre-heat pump preparation mode, releasing the exhaust pressure of the compressor through the pre-heat pump preparation mode, and preparing for the valve body opening when the vehicle thermal management system operates in the heat pump mode includes:

[0091] S601: Control one of the first refrigeration branch or the second refrigeration branch to operate at a first preset opening to release the exhaust pressure of the compressor, and control the corresponding branch to operate at the first preset opening for a third preset time and then shut down.

[0092] When the refrigerant extraction mode ends, only one of the first refrigeration branch and the second refrigeration branch will be closed, and the one that is not closed can be controlled to operate at a first preset opening.

[0093] In combination with the above content, if in the refrigerant extraction mode, the first refrigeration branch is turned on first, and the second refrigeration branch is turned on later, and the second refrigeration branch is not turned off when the refrigerant extraction mode ends. Then, at this time, the second refrigeration branch can be controlled to work at the first preset opening. In combination with the above content, if the second refrigeration branch ends the refrigerant extraction mode, and the number of steps of the fourth expansion valve E4 is also 100 steps, then when the second refrigeration branch is controlled to work at the first preset opening, the number of steps of the fourth expansion valve E4 can be controlled to be 200 steps to fully release the pressure.

[0094] Whether the pressure is released through the first refrigeration branch or the second refrigeration branch, the corresponding working time needs to be preset, that is, set to the third preset time length. The third preset time length may be the total time length of the heat pump pre-preparation mode.

[0095] The third preset time length can be set to a shorter time length, which can be shorter than the time length corresponding to the refrigerant extraction mode. In some application scenarios, if the second refrigeration branch is controlled to work at the first preset opening, and the number of steps of the fourth expansion valve E4 is 200 steps, the third preset time length can be set to 10S.

[0096] S602: Control the first valve body to open after a fourth preset time period after the compressor is turned off, and control the opening of the second valve body to be adjusted to a second preset opening.

[0097] The first valve body, i.e., the throttle valve S1, controls the first valve body to open after the compressor is turned off after a fourth preset time, i.e., controls the first valve body to open after the heat pump pre-preparation mode starts after a fourth preset time. The fourth preset time can be set according to actual needs, so that the heat pump mode can be entered more quickly after the first valve body is opened.

[0098] In combination with the above content, if the third preset time is set to 10S, then the third preset time can be set to 8S, and then the heat pump mode can be quickly entered after the first valve body is opened within the last 2S.

[0099] In heat pump mode, the second valve body also needs to be opened. The second preset opening is close to the actual required opening of the second valve body in heat pump mode, so that the time to adjust the opening of the second valve body to the actual required opening in heat pump mode is shorter, so that the valve body can be quickly put into place to ensure a good heating effect. In some application scenarios, the opening of the second valve body can be 200 steps, but it is not limited to this.

[0100] Fig.10 It is a flow chart of another embodiment of the control method of the vehicle thermal management system provided by the present application.

[0101] In some specific embodiments, after the vehicle thermal management system has completed working in the refrigerant extraction mode, the vehicle thermal management system is controlled to work in the heat pump mode to heat the passenger compartment of the vehicle through the heat pump circuit, that is, after the above step S103, including:

[0102] S701: When the vehicle thermal management system operates in a heat pump mode, detect the current speed of the compressor and the current inlet pressure of the compressor inlet in the heat pump circuit.

[0103] Although the refrigerant extraction mode is performed before the heat pump mode, when the vehicle thermal management system operates in the heat pump mode, some factors (for example, pipe leakage) will cause insufficient refrigerant in the heat pump circuit, which will affect the heating effect of the vehicle thermal management system.

[0104] In this embodiment, whether the refrigerant in the heat pump circuit is sufficient is determined by detecting the current rotation speed of the compressor and the current inlet pressure of the compressor.

[0105] S702: If the current rotation speed is less than the preset rotation speed and the current inlet pressure is less than the preset standard pressure, the thermal management system is controlled to enter the refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit.

[0106] If the current speed is less than the preset speed and the current inlet pressure is less than the preset standard pressure, it means that the refrigerant in the heat pump circuit is insufficient. At this time, the heat pump mode is stopped and the vehicle thermal management system is controlled to enter the refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit to ensure that the refrigerant in the heat pump circuit is sufficient.

[0107] Specifically, after the refrigerant extraction mode is run once, it can continue to detect whether the current speed is less than the preset speed and whether the current inlet pressure is less than the preset standard pressure. If not, the vehicle thermal management system can be controlled to run the refrigerant extraction mode again. If the conditions are still not met after three cycles, the vehicle thermal management system can be shut down for inspection.

[0108] In conjunction with the relevant contents of the above-mentioned vehicle thermal management system, the vehicle thermal management system also includes a control device, which is used to: obtain the current ambient temperature of the vehicle's environment, and obtain the current pressure of the compressor outlet in the heat pump circuit. If the current ambient temperature is lower than the preset temperature and the current pressure is lower than the preset pressure, the vehicle thermal management system is controlled to operate in a preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit; after the vehicle thermal management system has completed operating in the refrigerant extraction mode, the vehicle thermal management system is controlled to operate in a heat pump mode to heat the vehicle's passenger compartment through the heat pump circuit. For the specific execution method of the control device for the above steps, reference can be made to the relevant contents of the above-mentioned embodiments, and no further details will be given.

[0109] The present application also provides an electronic device, including: a processor; a memory for storing a computer program, and when the computer program is executed by the processor, the control method of the vehicle thermal management system in any of the above embodiments is implemented.

[0110] Fig.11 It is a schematic diagram of the structural framework of an embodiment of the electronic device 500 provided in the present application.

[0111] Combination Fig.11 In some specific embodiments, the electronic device 500 includes a central processing unit (CPU) 501 and a read-only memory (ROM) 502, wherein the central processing unit 501 is a processor and the read-only memory (ROM) 502 is a memory. The central processing unit 501 can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 502 or the program loaded from the storage part 508 to the random access memory (RAM) 503, such as executing the method in the above embodiment. In the RAM 503, various programs and data required for system operation are also stored. The CPU 501, the ROM 502 and the RAM 503 are connected to each other through the bus 504. The input / output (I / O) interface 505 is also connected to the bus 504.

[0112] The following components are connected to the I / O interface 505: an input section 506 including a keyboard, a mouse, etc.; an output section 507 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to the I / O interface 505 as needed. A removable medium 511, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 510 as needed so that a computer program read therefrom is installed into the storage section 508 as needed.

[0113] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication section 509, and / or installed from a removable medium 511. When the computer program is executed by a central processing unit (CPU) 501, various functions defined in the system of the present application are executed.

[0114] The present application also provides a computer readable storage medium 40, Fig.12 It is a schematic diagram of the structural framework of an embodiment of the computer-readable storage medium 40 provided in the present application.

[0115] The computer readable storage medium 40 stores a computer program 41 , and when the computer program 41 is executed by a processor, the control method of the vehicle thermal management system in any of the above-mentioned embodiments is implemented.

[0116] It should be noted that the computer-readable medium 40 shown in the embodiment of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it. In the present application, a computer-readable signal medium can include a data signal propagated in a baseband or as a part of a carrier wave, wherein a computer-readable computer program is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0117] In summary, based on the vehicle thermal management system and its control method, device and storage medium provided by this application, the method is applied to the vehicle thermal management system, the vehicle thermal management system includes a heat pump circuit, and a first refrigeration branch and a second refrigeration branch respectively connected in parallel with part of the pipelines of the heat pump circuit, and the method includes: obtaining the current ambient temperature of the environment in which the vehicle is located, and obtaining the current pressure of the compressor outlet in the heat pump circuit; if the current ambient temperature is lower than the preset temperature and the current pressure is lower than the preset pressure, then the vehicle thermal management system is controlled to work in a preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit; after the vehicle thermal management system has completed working in the refrigerant extraction mode, the vehicle thermal management system is controlled to work in the heat pump mode to heat the passenger compartment of the vehicle through the heat pump circuit. Therefore, before the heat pump mode, extracting the refrigerant in other branches into the heat pump circuit can enable the heat pump mode to be successfully started once, and there will be no shortage of refrigerant in the heat pump mode.

[0118] The above content is only a preferred exemplary embodiment of the present application and is not intended to limit the implementation scheme of the present application. A person skilled in the art can easily make corresponding changes or modifications based on the main concept and spirit of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection required by the claims.

Claims

1. A control method for a vehicle thermal management system, characterized in that: The method is applied to a vehicle thermal management system, the vehicle thermal management system comprising a heat pump circuit, and a first refrigeration branch and a second refrigeration branch respectively connected in parallel with a portion of the pipelines of the heat pump circuit, the method comprising: Obtaining the current ambient temperature of the environment in which the vehicle is located, and obtaining the current pressure of the compressor outlet in the heat pump circuit; If the current ambient temperature is lower than a preset temperature and the current pressure is lower than a preset pressure, the vehicle thermal management system is controlled to operate in a preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit; After the vehicle thermal management system has completed working in the refrigerant extraction mode, the vehicle thermal management system is controlled to work in a heat pump mode to heat the passenger compartment of the vehicle through the heat pump circuit.

2. The control method of a vehicle thermal management system according to claim 1, characterized in that: The step of controlling the vehicle thermal management system to operate in a preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit includes: Controlling one of the first refrigeration branch and the second refrigeration branch to be connected, and controlling the compressor in the heat pump circuit to operate, so as to extract the refrigerant in the connected refrigeration branch into the heat pump circuit; When it is detected that the conduction time of the turned-on refrigeration branch reaches a first preset time length, the first refrigeration branch and the other of the second refrigeration branch are controlled to be turned on to extract the refrigerant in the first refrigeration branch and the second refrigeration branch into the heat pump circuit.

3. The control method of a vehicle thermal management system according to claim 2, characterized in that: After detecting that the conduction time of the conducted refrigeration branch reaches a first preset time length, controlling the other of the first refrigeration branch and the second refrigeration branch to conduct, so as to extract the refrigerant in the first refrigeration branch and the second refrigeration branch into the heat pump circuit, the method includes: When it is detected that the first refrigeration branch and the second refrigeration branch are both in the on state for a second preset time period, one of the first refrigeration branch and the second refrigeration branch is controlled to be turned off and the compressor is stopped to end the refrigerant extraction mode.

4. The control method of a vehicle thermal management system according to claim 2, characterized in that: The step of controlling the conduction between the first refrigeration branch and the second refrigeration branch comprises: Controlling the first refrigeration branch and the second refrigeration branch, whichever has a larger predicted refrigerant amount, to be conductive; wherein the predicted refrigerant amount is a pre-measured refrigerant amount when the refrigeration branch is not working; or, The current refrigerant amount in the first refrigeration branch and the second refrigeration branch is detected, and the refrigeration branch with the larger current refrigerant amount is controlled to be conductive.

5. The control method of a vehicle thermal management system according to claim 1, characterized in that: After the vehicle thermal management system has completed working in the refrigerant extraction mode, the step of controlling the vehicle thermal management system to work in a heat pump mode to heat the passenger compartment of the vehicle through the heat pump circuit includes: After the vehicle thermal management system has completed working in the refrigerant extraction mode, controlling the vehicle thermal management system to work in a preset heat pump pre-preparation mode, so as to release the exhaust pressure of the compressor through the heat pump pre-preparation mode and prepare for the valve body opening when the vehicle thermal management system works in the heat pump mode; After the thermal management system has completed working in the heat pump pre-preparation mode, the vehicle thermal management system is controlled to enter a heat pump mode to heat the passenger compartment of the vehicle through the heat pump circuit.

6. The control method of a vehicle thermal management system according to claim 5, characterized in that: The inlet of the first refrigeration branch is connected to the outlet of the built-in condenser of the heat pump branch, the inlet of the second refrigeration branch is connected to the outlet of the compressor, and the outlets of the first refrigeration branch and the second refrigeration branch are both connected to the inlet of the liquid storage bottle in the heat pump circuit; the heat pump circuit is provided with a first valve body between the inlet and the outlet of the first refrigeration branch, and the first valve body is closed in the refrigerant extraction mode; the heat pump circuit is provided with a second valve body between the liquid storage bottle and the heat exchanger, and the second valve body is opened in the refrigerant extraction mode; The step of controlling the vehicle thermal management system to operate in a preset pre-heat pump preparation mode, releasing the exhaust pressure of the compressor through the pre-heat pump preparation mode, and preparing for the valve body opening when the vehicle thermal management system operates in the heat pump mode includes: Controlling one of the first refrigeration branch or the second refrigeration branch to operate at a first preset opening to release the exhaust pressure of the compressor, and controlling the corresponding branch to operate at the first preset opening for a third preset time and then shut down; The first valve body is controlled to open after a fourth preset time period after the compressor is turned off, and the opening degree of the second valve body is controlled to be adjusted to a second preset opening degree.

7. The control method of a vehicle thermal management system according to claim 1, characterized in that: After the vehicle thermal management system has completed working in the refrigerant extraction mode, the step of controlling the vehicle thermal management system to work in a heat pump mode to heat the passenger compartment of the vehicle through the heat pump circuit includes: When the vehicle thermal management system operates in the heat pump mode, detecting a current rotation speed of the compressor and a current inlet pressure of the compressor inlet in the heat pump circuit; If the current speed is less than the preset speed and the current inlet pressure is less than the preset standard pressure, the thermal management system is controlled to enter the refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit.

8. A vehicle thermal management system, characterized in that: include: A heat pump circuit is provided with a compressor, a built-in condenser and a liquid storage bottle; A first refrigeration branch, an inlet of which is connected to the outlet of the compressor, and an outlet of which is connected to the liquid storage bottle; A second refrigeration branch, the inlet of which is connected to the outlet of the built-in condenser, and the outlet of which is connected to the liquid storage bottle; A control device is used to obtain the current ambient temperature of the vehicle's environment and the current pressure at the compressor outlet in the heat pump circuit; if the current ambient temperature is lower than a preset temperature and the current pressure is lower than a preset pressure, the vehicle thermal management system is controlled to operate in a preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit; after the vehicle thermal management system has completed operating in the refrigerant extraction mode, the vehicle thermal management system is controlled to operate in a heat pump mode to heat the vehicle's passenger compartment through the heat pump circuit.

9. An electronic device, characterized in that: include: processor; A memory for storing a computer program, wherein the computer program, when executed by the processor, implements the control method of the vehicle thermal management system according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, which, when executed by a processor, implements a control method for a vehicle thermal management system according to any one of claims 1 to 7.

Images