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

Abstract

The invention relates to the technical field of vehicle thermal management, and discloses a vehicle thermal management system, a control method and device of the vehicle thermal management system and a storage medium. The vehicle thermal management system comprises a heat pump loop and a hot gas bypass branch, and an inlet of the hot gas bypass branch communicates with an outlet of a compressor of the heat pump loop; the method comprises the steps that when a passenger compartment heating instruction is detected, the current environment temperature of the environment where the vehicle is located is obtained; and if the current environment temperature is within the first preset temperature range, the heat pump loop is controlled to work to heat the passenger compartment, and the hot gas bypass branch is controlled to extract the refrigerant at the outlet of the compressor. Therefore, when the heat pump mode is operated in the low-temperature environment, the refrigerant at the outlet of the compressor is guided into the front of the heat converter through the hot gas bypass branch, the superheat degree at the inlet of the compressor can be guaranteed, the compressor can normally operate in the low-temperature environment, and the heating effect of a passenger compartment is guaranteed.

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] In a low temperature environment, when the vehicle thermal management system operates in heat pump mode to heat the passenger compartment, it is easy to cause the heat pump mode to operate abnormally or the heating effect on the passenger compartment to be poor. 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. When operating in heat pump mode in a low-temperature environment, the refrigerant at the compressor outlet is introduced into the front of the heat converter through the hot gas bypass branch, which can ensure that there is overheating at the compressor inlet, so that the compressor can operate normally in a low-temperature environment and ensure the heating effect of the passenger compartment.

[0005] On the one hand, the present application provides a control method for a vehicle thermal management system, the vehicle thermal management system includes a heat pump circuit and a hot gas bypass branch, the inlet of the hot gas bypass branch is connected to the compressor outlet of the heat pump circuit, and the outlet is connected to a portion between a heat converter of the heat pump circuit and a first valve body, the method includes: when a passenger compartment heating command is detected, the current ambient temperature of the vehicle's environment is obtained; if the current ambient temperature is within a first preset temperature range, the heat pump circuit is controlled to heat the passenger compartment, and the hot gas bypass branch is controlled to extract refrigerant at the outlet of the compressor; wherein the highest temperature in the first preset temperature range is lower than the preset temperature.

[0006] In some specific embodiments, when a passenger compartment heating command is detected, after the step of obtaining the current ambient temperature of the vehicle's environment, the following steps are included: if the current ambient temperature is within a first preset temperature range, the current pressure at the outlet of the compressor is obtained; if the current pressure is greater than or equal to the preset pressure, the heat pump circuit is controlled to heat the passenger compartment, and the hot gas bypass branch is controlled to extract the refrigerant at the outlet of the compressor.

[0007] In some specific embodiments, the vehicle thermal management system also includes a first refrigeration branch and a second refrigeration branch connected in parallel with part of the pipelines of the heat pump circuit, and the method also includes: after detecting a passenger compartment heating command, obtaining the current ambient temperature of the vehicle's environment, including: if the current ambient temperature is within a first preset temperature range, obtaining the current pressure at the outlet of the compressor; if the current pressure is less than the 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, executing the step of controlling the heat pump circuit to heat the passenger compartment, and controlling the hot gas bypass branch to extract the refrigerant at the outlet of the compressor.

[0008] 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.

[0009] In some specific embodiments, after the vehicle thermal management system has completed working in the refrigerant extraction mode, after executing the steps of controlling the heat pump circuit to heat the passenger compartment and controlling the hot gas bypass branch to extract the refrigerant at the outlet of the compressor, it includes: during the operation of the heat pump circuit and the hot gas bypass branch, detecting the current ambient temperature of the vehicle's environment; if the current ambient temperature of the vehicle is higher than the highest temperature in the first preset temperature range, controlling the hot gas bypass branch to be closed.

[0010] In some specific embodiments, the vehicle thermal management system also includes a first refrigeration branch and a second refrigeration branch connected in parallel with part of the pipelines of the heat pump circuit; when a passenger compartment heating command is detected, after the step of obtaining the current ambient temperature of the vehicle's environment, it includes: if the current ambient temperature is within a second preset temperature range, obtaining the current pressure of the compressor outlet; wherein the lowest temperature of the second preset temperature range is higher than or equal to the highest temperature of the first preset temperature range; if the current pressure is less than the 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 heat pump circuit to operate to heat the passenger compartment.

[0011] In some specific embodiments, after the step of obtaining the current ambient temperature of the environment in which the vehicle is located after the passenger compartment heating instruction is detected, the following steps are included: if the current ambient temperature is within a second preset temperature range, obtaining the current pressure at the compressor outlet; wherein the lowest temperature of the second preset temperature range is higher than or equal to the highest temperature of the first preset temperature range; if the current pressure is greater than or equal to the preset pressure, controlling the heat pump circuit to work for heating the passenger compartment;

[0012] On the other hand, the present application provides a vehicle thermal management system, including: a heat pump circuit, provided with a compressor, a heat converter and a first valve body, the first valve body being the first valve body in front of the heat converter; a hot gas bypass circuit, the inlet of which is connected to the outlet of the compressor, and the outlet is connected to the part between the heat converter and the first valve body; a controller, for detecting a passenger compartment heating instruction, and obtaining the current ambient temperature of the vehicle's environment; if the current ambient temperature is within a first preset temperature range, controlling the heat pump circuit to heat the passenger compartment, and controlling the hot gas bypass branch to extract refrigerant at the outlet of the compressor; wherein the highest temperature in the first preset temperature range is lower than the preset temperature.

[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 vehicle thermal management system includes a heat pump circuit and a hot gas bypass branch, the inlet of the hot gas bypass branch is connected to the compressor outlet of the heat pump circuit, and the outlet is partially connected to the heat converter of the heat pump circuit and the first valve body, and the method includes: when the passenger compartment heating instruction is detected, the current ambient temperature of the vehicle environment is obtained; if the current ambient temperature is within the first preset temperature range, the heat pump circuit is controlled to heat the passenger compartment, and the hot gas bypass branch is controlled to extract the refrigerant at the outlet of the compressor; wherein the highest temperature in the first preset temperature range is lower than the preset temperature. Therefore, when the heat pump mode is operated in a low temperature environment, the refrigerant at the outlet of the compressor is introduced into the heat converter through the hot gas bypass branch, which can ensure that there is overheating at the inlet of the compressor, so that the compressor can operate normally in a low temperature environment, and the heating effect for the passenger compartment is ensured.

[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, a second refrigeration branch and a hot gas bypass 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 5 is 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, the second refrigeration branch and the hot gas bypass 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 E2 in sequence. The refrigerant on the refrigerant side L exchanges heat with the coolant on the water side W, and then indirectly absorbs heat from the electric drive module or the air, 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 separation and 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 condenser LN of the front HVAC to heat the passenger compartment.

[0035] Combination Figure 1 The 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 (including the throttle valve S1) in the heat pump circuit, and the second refrigeration branch is connected in parallel with the AD section (including the seventh expansion valve E7) 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 circuit, 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 1 The first refrigeration branch is provided with a condenser LN. The condenser LN in the first 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 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 part of the air conditioning refrigeration circuit, and the second refrigeration branch is actually 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. In addition, at lower ambient temperatures, more refrigerant may be stored in the first refrigeration branch and the second refrigeration branch, while less refrigerant may be stored in the heat pump circuit.

[0040] Continue to combine Figure 1 as well as Figure 2 The vehicle thermal management system further includes a hot gas bypass branch, the inlet of the hot gas bypass branch is connected to the outlet of the compressor Y of the heat pump circuit, and the outlet of the hot gas bypass branch is connected to the portion between the heat converter and the first valve body of the heat pump circuit. The heat converter here is the first heat exchanger HS1 in the figure, and the first valve body is the second expansion valve E2. That is, the outlet of the hot gas bypass branch is connected to the portion between the first heat exchanger and the second expansion valve E2, and the second valve body is the first expansion valve before the first heat exchanger.

[0041] Among them, the hot gas bypass branch is provided with a fifth expansion valve E5. When the fifth expansion valve E5 is turned on, the hot gas bypass branch is opened to introduce the gaseous refrigerant derived from the compressor outlet into the inlet of the first heat exchanger HS1. It should be understood that in this way, the gaseous refrigerant with a large amount of heat can be introduced into the first heat exchanger, thereby providing more heat for the heating of the heat pump circuit. In the case where the water side of the first heat exchanger cannot provide more heat (low temperature environment, large heating demand), it can ensure that the refrigerant on the compressor inlet side has enough heat to ensure sufficient superheat, thereby ensuring that the compressor can work normally, so as to ensure a better heating effect in the heat pump mode.

[0042] In a low temperature environment, if the vehicle is in heat pump mode, it is easy for the heat pump circuit to fail to absorb enough heat during operation due to the low ambient temperature, resulting in insufficient superheating of the refrigerant on the compressor inlet side, causing the compressor to fail to operate normally and reducing the heating effect in the heat pump mode.

[0043] 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.

[0044] 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:

[0045] S101: When a passenger compartment heating instruction is detected, the current ambient temperature of the vehicle environment is obtained.

[0046] The heating instruction for the passenger compartment may be issued by the user or automatically by the vehicle, and there is no specific limitation here.

[0047] In this embodiment, in order to introduce the ambient temperature to realize the control of the thermal management system, when the heating instruction of the passenger compartment is detected, the current ambient temperature of the vehicle environment is obtained.

[0048] The vehicle may be provided with an ambient temperature sensor to obtain the current 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 by combining the location information of the vehicle's location and the weather information (including ambient temperature) of the location through the vehicle controller.

[0049] S102: If the current ambient temperature is within a first preset temperature range, the heat pump circuit is controlled to heat the passenger compartment, and the hot gas bypass branch is controlled to extract the refrigerant at the outlet of the compressor; wherein the highest temperature in the first preset temperature range is lower than the preset temperature.

[0050] The first preset temperature range is set in advance according to actual needs, and its maximum temperature is lower than the preset temperature (the preset temperature is relatively low) in order to ensure that the first preset temperature range is a relatively low temperature range. The setting standard of the first preset temperature range may be: in the first preset temperature range, when the vehicle works in the heat pump mode, it is easy for the refrigerant on the compressor inlet side to be insufficiently superheated, and thus it is easy for the compressor to fail to operate normally.

[0051] In some application scenarios, the preset temperature can be set to -30°C. In this case, the first preset temperature range is set to T1, and T1 can satisfy: -40°C ≤ T1 < -30°C. Of course, this is only one way to set the first preset temperature range. As factors such as vehicle configuration change, the first preset temperature range can change.

[0052] Wherein, when the current ambient temperature is lower than the lowest temperature in the first preset temperature range, the heat pump mode may not be operated. In combination with the above content, when the current ambient temperature is lower than -40°C, the heat pump mode may not be operated.

[0053] In combination with the above content, if the current ambient temperature is within the first preset temperature range, it means that the superheat of the refrigerant at the compressor inlet side may not be enough. Therefore, this embodiment sets a hot gas bypass branch, and while controlling the heat pump circuit to heat the passenger compartment, controls the hot gas bypass branch to be turned on to extract the refrigerant at the compressor outlet to the inlet of the first heat exchanger, thereby making the superheat of the refrigerant at the compressor inlet sufficient.

[0054] In summary, when operating in heat pump mode in a low-temperature environment, the refrigerant at the compressor outlet is introduced into the heat converter (first heat exchanger) through the hot gas bypass branch, which can ensure that there is overheating at the compressor inlet, so that the compressor can operate normally in a low-temperature environment and ensure the heating effect of the passenger compartment.

[0055] 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.

[0056] Combination Figure 5 In some specific embodiments, after the passenger compartment heating instruction is detected, the step of obtaining the current ambient temperature of the vehicle environment, that is, after the above step S101, includes:

[0057] S201: If the current ambient temperature is within a first preset temperature range, obtain the current pressure at the outlet of the compressor.

[0058] If the current ambient temperature is within the first preset temperature range, this embodiment will not directly control the vehicle thermal management system to enter the heat pump mode and open the hot gas bypass branch, but will detect the current pressure at the compressor outlet, so that in subsequent steps, the relevant steps can be executed based on the current pressure.

[0059] Among them, a pressure detection device can be set at the outlet side of the compressor, and the pressure at the compressor outlet can be detected in real time by the pressure detection device. It should be understood that the current pressure at the outlet of the compressor, that is, the current pressure of the outlet pipeline of the compressor, is related to factors such as the state and amount of the refrigerant in the outlet pipeline of the compressor.

[0060] S202: If the current pressure is greater than or equal to the preset pressure, the steps of controlling the heat pump circuit to heat the passenger compartment and controlling the hot gas bypass branch to extract the refrigerant at the outlet of the compressor are executed.

[0061] The preset pressure is pre-set, and the setting standard of the preset pressure can be: when the current pressure is lower than the preset pressure, the compressor shutdown time exceeds a certain time, and the refrigerant is likely to be insufficient when the heat pump mode is started. In some application scenarios, the preset pressure can be 10bar.

[0062] When the current pressure is greater than or equal to the preset pressure, it means that the compressor has not been shut down for a long time, and when the heat pump function is started, it is not easy to have insufficient refrigerant. Therefore, at this time, the steps of controlling the heat pump circuit to heat the passenger compartment and controlling the hot gas bypass branch to extract the refrigerant at the outlet of the compressor are directly executed.

[0063] 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.

[0064] Combination Figure 6 In some specific embodiments, the vehicle thermal management system further includes the first cooling branch and the second cooling branch. Based on this vehicle thermal management system, after detecting the passenger compartment heating instruction, the step of obtaining the current ambient temperature of the vehicle environment, that is, after the above step S101, includes:

[0065] S301: If the current ambient temperature is within a first preset temperature range, obtain the current pressure at the outlet of the compressor.

[0066] Similarly, if the current ambient temperature is lower than the first preset temperature range, this embodiment will not directly control the vehicle thermal management system to enter the heat pump mode and open the hot gas bypass branch, but will detect the current pressure at the compressor outlet, so that in subsequent steps, the relevant steps can be executed based on the current pressure.

[0067] S302: If the current pressure is less 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.

[0068] Combined with the above content, it can be seen that if the current pressure is less than the preset pressure, it means that the compressor shutdown time is not long. At this time, if the heat pump mode is directly started, it is easy to cause the problem of heat pump mode startup failure caused by insufficient refrigerant.

[0069] In this case, the vehicle thermal management system will be controlled to operate in a preset refrigerant extraction mode, thereby extracting the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit, thereby increasing the refrigerant in the heat pump circuit.

[0070] 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.

[0071] S303: After the vehicle thermal management system has completed working in the refrigerant extraction mode, executing the steps of controlling the heat pump circuit to heat the passenger compartment and controlling the hot gas bypass branch to extract the refrigerant at the outlet of the compressor.

[0072] After the vehicle thermal management system has completed working in the refrigerant extraction mode, the amount of refrigerant in the heat pump circuit is relatively large. If the heat pump mode is running at this time, the heat pump mode can be started normally without any startup failure. Therefore, starting the heat pump mode at this time means controlling the heat pump circuit to heat the passenger compartment. Since the heat pump mode is still in a low temperature environment at this time, the hot gas bypass branch will be controlled to extract the refrigerant at the outlet of the compressor to ensure the normal operation of the compressor.

[0073] Therefore, through this embodiment, before running the heat pump mode, if there is a shortage of refrigerant, the refrigerant in other branches can be extracted into the heat pump circuit through the preset refrigerant extraction mode, thereby ensuring that the vehicle thermal management system starts the heat pump mode normally.

[0074] Figure 7 It is a flow chart of another embodiment of the control method of the vehicle thermal management system provided by the present application.

[0075] Combination Figure 7 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:

[0076] S401: 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.

[0077] It should be understood that in this embodiment, when this step is performed, the vehicle thermal management system operates 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.

[0078] 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.

[0079] 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.

[0080] Furthermore, when one of the first refrigeration branch and the second refrigeration branch is controlled to be turned on in the refrigerant extraction mode, the pipe section in the heat pump circuit connected in parallel with the first refrigeration branch or the second refrigeration branch that is turned on can be controlled to be turned off. For example, whether the first refrigeration branch is controlled to be turned on or the second refrigeration branch is controlled to be turned on, the throttle valve S1 can be controlled to be turned off, thereby turning off the pipe section BD in the heat pump circuit. Among them, when the first refrigeration branch is controlled to be turned on, the seventh expansion valve E7 needs to be controlled to be turned on, and when only the second refrigeration branch is controlled to be turned on, the seventh expansion valve E7 can be closed or opened. For ease 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. 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 turned off.

[0081] S402: 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.

[0082] 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.

[0083] Therefore, the above-mentioned embodiment specifically defines the preset refrigerant extraction mode, which can adapt to the actual operation of the vehicle thermal management system.

[0084] Further, the step of controlling the conduction between the first refrigeration branch and the second refrigeration branch may be: 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 the pre-measured refrigerant amount when the refrigeration branch is not working.

[0085] 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 conductive.

[0086] 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.

[0087] It should be understood that controlling the operation of the one with the larger predicted refrigerant amount can ensure that the refrigerant in the refrigeration branch with a larger refrigerant amount is 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.

[0088] 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.

[0089] Combination Figure 8 In some specific embodiments, after the vehicle thermal management system completes the operation in the refrigerant extraction mode, after executing the steps of controlling the heat pump circuit to heat the passenger compartment and controlling the hot gas bypass branch to extract the refrigerant at the outlet of the compressor, the method includes:

[0090] S501: During the operation of the heat pump circuit and the hot gas bypass branch, the current ambient temperature of the vehicle environment is detected.

[0091] After the vehicle thermal management system has completed working in the refrigerant extraction mode, the heat pump mode is now running, and the hot gas bypass branch is controlled to be open during the operation of the heat pump mode. In combination with the above content, in the heat pump mode, the hot gas bypass branch is controlled to be open only when the temperature is within the first preset temperature range.

[0092] Therefore, in the heat pump mode, if the hot gas bypass branch is controlled to be turned on, in order to avoid unnecessary conduction of the hot gas bypass branch, it is necessary to detect the current ambient temperature to choose whether to keep the hot gas bypass branch turned on or closed according to the current ambient temperature.

[0093] S502: If the current ambient temperature of the vehicle is higher than the highest temperature in the first preset temperature range, the hot gas bypass branch is controlled to be closed.

[0094] If the current ambient temperature is higher than the highest temperature in the first preset temperature range, it means that the ambient temperature is high and is not within the first preset temperature range. In combination with the above, if -40℃≤T1<-30℃, if the current ambient temperature is equal to or higher than -30℃, then the current ambient temperature is higher than the highest temperature in the first preset temperature range, and the hot gas bypass branch is controlled to be closed.

[0095] 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.

[0096] Combination Fig. 9 In some specific embodiments, the vehicle thermal management system also includes a first cooling branch and a second cooling branch. Based on this vehicle thermal management system, after detecting a passenger compartment heating instruction, the step of obtaining the current ambient temperature of the vehicle environment, that is, after the above step S101, includes:

[0097] S601: If the current ambient temperature is within the second preset temperature range, obtain the current pressure of the compressor outlet; wherein the lowest temperature of the second preset temperature range is higher than or equal to the highest temperature of the first preset temperature range.

[0098] The second preset temperature range is preset, and the lowest temperature of the second preset temperature range is greater than or equal to the highest temperature of the first preset temperature range, so that the second preset temperature range is a relatively high temperature range. However, the second preset temperature range needs to be set below a specific temperature, such as below 0 degrees. At this time, when the current ambient temperature is within the second preset temperature range, it is still within a lower temperature range.

[0099] In some application scenarios, assuming that the second preset temperature range is T2, the second preset temperature range T2 may be: -30°C ≤ T2 < 0°C.

[0100] Among them, when the current ambient temperature is higher than the highest temperature of the second preset temperature range, the vehicle thermal management system can be controlled to directly operate the heat pump mode. For example, when the current ambient temperature is higher than 0°C, the heat pump mode is directly operated. Because the ambient temperature is high at this time, there will be no lack of refrigerant in the heat pump circuit, so the heat pump mode can be directly operated.

[0101] Although the current temperature range is not within the first preset temperature range, there is no need to control the hot gas bypass branch to open in the heat pump mode. However, if the temperature is within the second preset temperature range, the heat pump mode may fail to start. Therefore, the current pressure at the outlet of the compressor is detected at this time, and then it is determined whether the heat pump mode is likely to fail to start based on the current pressure.

[0102] S602: If the current pressure is less 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.

[0103] If the current pressure is lower than the preset pressure, it means that the compressor has been shut down for a long time. If the heat pump mode is started at the current ambient temperature, it is easy to fail to start the heat pump mode due to lack of refrigerant. At this time, the vehicle thermal management system is controlled to work in the preset refrigerant extraction mode to extract the refrigerant in the first refrigeration branch and / or the second refrigeration branch into the heat pump circuit, so that the amount of refrigerant in the heat pump circuit increases.

[0104] For relevant instructions on the vehicle thermal management system operating in the preset refrigerant extraction mode, please refer to the relevant content of the above embodiment, which will not be repeated here.

[0105] S603: After the vehicle thermal management system has completed working in the refrigerant extraction mode, the heat pump circuit is controlled to heat the passenger compartment.

[0106] After the vehicle thermal management system has completed working in the refrigerant extraction mode, there is a lot of refrigerant in the heat pump circuit. At this time, the heat pump circuit is controlled to heat the passenger compartment, that is, the heat pump mode is started. At this time, there will be no problem of unsuccessful starting due to insufficient refrigerant.

[0107] 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.

[0108] Combination Fig.10 In some specific embodiments, after the passenger compartment heating instruction is detected, the step of obtaining the current ambient temperature of the vehicle environment, that is, after the above step S101, includes:

[0109] S701: If the current ambient temperature is within the second preset temperature range, obtain the current pressure of the compressor outlet; wherein the lowest temperature of the second preset temperature range is higher than or equal to the highest temperature of the first preset temperature range.

[0110] Similarly, although the current temperature range is not within the first preset temperature range, there is no need to control the hot gas bypass branch to open in the heat pump mode. However, if the temperature is within the second preset temperature range, the problem of unsuccessful start of the heat pump mode may occur. Therefore, the current pressure of the compressor outlet is detected at this time, and then it is determined whether the problem of unsuccessful start of the heat pump mode is likely to occur based on the current pressure.

[0111] S702: If the current pressure is greater than or equal to the preset pressure, the heat pump circuit is controlled to heat the passenger compartment.

[0112] If the current pressure is greater than or equal to the preset high pressure, it means that the compressor has not been shut down for a long time. Even if the current ambient temperature is within the lower second preset temperature range, the amount of refrigerant in the heat pump circuit is generally sufficient. Therefore, there is no need to run the refrigerant extraction mode before starting the heat pump mode. At this time, the heat pump circuit can be directly controlled to heat the passenger compartment.

[0113] In conjunction with the above-mentioned vehicle thermal management system, the vehicle thermal management system may further include a controller. The controller is used to: when a passenger compartment heating instruction is detected, obtain the current ambient temperature of the vehicle's environment; if the current ambient temperature is within a first preset temperature range, control the heat pump circuit to heat the passenger compartment, and control the hot gas bypass branch to extract the refrigerant at the outlet of the compressor; wherein the highest temperature in the first preset temperature range is lower than the preset temperature. The specific execution method of the controller for the above steps can refer to the description of the above method part.

[0114] On the other hand, the present application provides an electronic device, including: a processor; a memory for storing a computer program, which, when executed by the processor, implements the control method of the vehicle thermal management system in any of the above embodiments.

[0115] Fig.11 It is a schematic diagram of the structural framework of an embodiment of the electronic device 500 provided in the present application.

[0116] Combination Fig.11In 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.

[0117] 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.

[0118] 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.

[0119] In another aspect, the present application 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.

[0120] Combination Fig.12 A computer program 41 is stored on the computer-readable storage medium 40. When the computer program 41 is executed by the processor, the control method of the vehicle thermal management system in any of the above embodiments is implemented.

[0121] 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 (Erasable Programmable Read On ly Memory, EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (Compact Disc 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.

[0122] In summary, based on the vehicle thermal management system and its control method, equipment and storage medium provided by the present application, the vehicle thermal management system includes a heat pump circuit and a hot gas bypass branch, the inlet of the hot gas bypass branch is connected to the compressor outlet of the heat pump circuit, and the outlet is partially connected to the heat converter of the heat pump circuit and the first valve body, and the method includes: when the passenger compartment heating instruction is detected, the current ambient temperature of the vehicle environment is obtained; if the current ambient temperature is within the first preset temperature range, the heat pump circuit is controlled to heat the passenger compartment, and the hot gas bypass branch is controlled to extract the refrigerant at the outlet of the compressor; wherein the highest temperature in the first preset temperature range is lower than the preset temperature. Therefore, when the heat pump mode is operated in a low temperature environment, the refrigerant at the outlet of the compressor is introduced into the heat converter through the hot gas bypass branch, which can ensure that there is overheating at the inlet of the compressor, so that the compressor can operate normally in a low temperature environment, and the heating effect for the passenger compartment is ensured.

[0123] 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 vehicle thermal management system comprises a heat pump circuit and a hot gas bypass branch, wherein the inlet of the hot gas bypass branch is connected to the compressor outlet of the heat pump circuit, and the outlet is connected to a portion between a heat converter and a first valve body of the heat pump circuit, and the method comprises: When a passenger compartment heating command is detected, the current ambient temperature of the vehicle's environment is obtained; If the current ambient temperature is within a first preset temperature range, the heat pump circuit is controlled to heat the passenger compartment, and the hot gas bypass branch is controlled to extract the refrigerant at the outlet of the compressor; wherein the highest temperature of the first preset temperature range is lower than the preset temperature.

2. The control method of a vehicle thermal management system according to claim 1, characterized in that: After the passenger compartment heating instruction is detected, the step of obtaining the current ambient temperature of the vehicle environment includes: If the current ambient temperature is within the first preset temperature range, obtaining the current pressure at the outlet of the compressor; If the current pressure is greater than or equal to the preset pressure, the steps of controlling the heat pump circuit to heat the passenger compartment and controlling the hot gas bypass branch to extract the refrigerant at the outlet of the compressor are executed.

3. The control method of a vehicle thermal management system according to claim 1, characterized in that: The vehicle thermal management system further includes a first refrigeration branch and a second refrigeration branch connected in parallel with a portion of the pipelines of the heat pump circuit; After the passenger compartment heating instruction is detected, the step of obtaining the current ambient temperature of the vehicle environment includes: If the current ambient temperature is within the first preset temperature range, obtaining the current pressure at the outlet of the compressor; If the current pressure is less 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 completes operation in the refrigerant extraction mode, the steps of controlling the heat pump circuit to heat the passenger compartment and controlling the hot gas bypass branch to extract refrigerant at the outlet of the compressor are executed.

4. The control method of the vehicle thermal management system according to claim 3, 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 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.

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 steps of controlling the heat pump circuit to heat the passenger compartment and controlling the hot gas bypass branch to extract the refrigerant at the outlet of the compressor are performed, including: During the operation of the heat pump circuit and the hot gas bypass branch, detecting the current ambient temperature of the environment in which the vehicle is located; If the current ambient temperature of the vehicle is higher than the highest temperature of the first preset temperature range, the hot gas bypass branch is controlled to be closed.

6. The control method of a vehicle thermal management system according to claim 1, characterized in that: The vehicle thermal management system further includes a first refrigeration branch and a second refrigeration branch connected in parallel with a portion of the pipelines of the heat pump circuit; After the passenger compartment heating instruction is detected, the step of obtaining the current ambient temperature of the vehicle environment includes: If the current ambient temperature is within a second preset temperature range, the current pressure at the compressor outlet is obtained; wherein the lowest temperature of the second preset temperature range is higher than or equal to the highest temperature of the first preset temperature range; If the current pressure is less 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 operation in the refrigerant extraction mode, the heat pump circuit is controlled to operate to heat the passenger compartment.

7. The control method of a vehicle thermal management system according to claim 1, characterized in that: After the passenger compartment heating instruction is detected, the step of obtaining the current ambient temperature of the vehicle environment includes: If the current ambient temperature is within a second preset temperature range, the current pressure at the compressor outlet is obtained; wherein the lowest temperature of the second preset temperature range is higher than or equal to the highest temperature of the first preset temperature range; If the current pressure is greater than or equal to the preset pressure, the heat pump circuit is controlled to heat the passenger compartment.

8. A vehicle thermal management system, characterized in that: include: A heat pump circuit is provided with a compressor, a heat converter and a first valve body, wherein the first valve body is the first valve body before the heat converter; a hot gas bypass circuit, the inlet of which is connected to the outlet of the compressor, and the outlet of which is connected to a portion between the heat converter and the first valve body; A controller for detecting a passenger compartment heating instruction and acquiring the current ambient temperature of the vehicle's environment; if the current ambient temperature is within a first preset temperature range, controlling the heat pump circuit to heat the passenger compartment and controlling the hot gas bypass branch to extract refrigerant at the outlet of the compressor; wherein the highest temperature of the first preset temperature range is lower than the preset temperature.

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.

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