Automotive air conditioning system repair refrigerant temporary storage and release system and control method

Abstract

This application discloses a refrigerant temporary storage and release system and its control method for automotive air conditioning system maintenance. The system establishes a first refrigerant circulation path consisting of a compressor, condenser, and a first evaporator, and a second refrigerant circulation path formed by a second evaporator connected in parallel with the first evaporator. The two circulation paths are switched and controlled by an electronic valve assembly and an electronically controlled shut-off valve assembly. Before vehicle maintenance, the original refrigerant is transferred to the second evaporator and its connected pipeline for temporary storage. After maintenance, the temporarily stored refrigerant is released back into the first refrigerant circulation path. This system can achieve refrigerant temporary storage and reuse without the need for external special refrigerant recovery equipment, avoiding the emission of refrigerant to the outside during maintenance, reducing refrigerant waste and environmental pollution, and lowering the maintenance cost of refrigerant refilling during vehicle maintenance. It also improves the convenience, resource utilization, and environmental friendliness of automotive air conditioning system maintenance.

Description

Technical Field

[0001] This application relates to the technical field of automotive air conditioning, and in particular to a refrigerant temporary storage and release system and its control method for automotive air conditioning system maintenance. Background Technology

[0002] When repairing or replacing parts in an automotive air conditioning system, it is usually necessary to first recover the refrigerant from the system, and then re-vacuum and recharge the system after the repair is completed. Currently, refrigerant recovery mainly relies on specialized refrigerant recovery equipment, which extracts the refrigerant from the vehicle's air conditioning system to an external storage device through external piping. This method requires specialized equipment, which has problems such as high cost, large size, and inconvenience in movement and use, and is particularly unsuitable for certain repair scenarios. Furthermore, refrigerant usually needs to be recharged after the repair, increasing vehicle maintenance costs. In addition, if refrigerant is directly released into the environment during the repair process, it may cause refrigerant waste and environmental pollution. Summary of the Invention

[0003] The purpose of this application is to overcome the above-mentioned problems and provide a refrigerant temporary storage and release system for automotive air conditioning system maintenance, as well as its control method, storage medium, electronic equipment and computer program product.

[0004] The technical solution of this application provides a refrigerant storage and release system for automotive air conditioning system maintenance, including a compressor, a condenser, a first evaporator, a second evaporator, an electronic valve assembly, an electronically controlled shut-off valve assembly, and a control module; The compressor, condenser, and first evaporator constitute the first refrigerant circulation path. The second evaporator is connected in parallel with the first evaporator and together with the compressor and condenser, constitutes the second refrigerant circulation path. The electronic valve assembly is used to control the refrigerant flow status in the first and second refrigerant circulation paths; The electronically controlled shut-off valve assembly is used to control the refrigerant flow status between the second refrigerant circulation path and the compressor, and between the condenser and the first and second refrigerant circulation paths; The control module is communicatively connected to the compressor, electronic valve assembly, and electrically controlled shut-off valve assembly, and is used to control the electronic valve assembly and electrically controlled shut-off valve assembly to switch to refrigerant storage state or refrigerant release state.

[0005] Furthermore, the electronic valve assembly includes a first electronic valve; The first electronic valve is installed in the first refrigerant circulation path; The first electronic valve is connected to the control module via communication.

[0006] Furthermore, the electronic valve assembly also includes a second electronic valve; The second electronic valve is located in the second refrigerant circulation path; The second electronic valve is connected to the control module via communication.

[0007] Furthermore, the electrically controlled shut-off valve assembly includes a first electrically controlled shut-off valve; The first electrically controlled shut-off valve is located at the outlet end of the second evaporator; The first electrically controlled shut-off valve is connected to the control module via communication.

[0008] Furthermore, the electrically controlled shut-off valve assembly also includes a second electrically controlled shut-off valve; The second electrically controlled shut-off valve is installed at the outlet end of the condenser; The second electrically controlled shut-off valve is connected to the control module via communication.

[0009] Furthermore, the second evaporator and the piping between the second evaporator and the first electrically controlled shut-off valve form a refrigerant storage area; The first electrically controlled shut-off valve is used to isolate the refrigerant storage area.

[0010] Furthermore, it also includes a temperature and pressure sensor for detecting refrigerant temperature and pressure; The temperature and pressure sensor is connected to the control module and is used to send the detected refrigerant temperature and pressure to the control module.

[0011] Furthermore, the temperature and pressure sensor includes a first temperature and pressure sensor and a second temperature and pressure sensor; The first temperature and pressure sensor is located at the outlet end of the condenser, and the second temperature and pressure sensor is located at the inlet end of the second evaporator.

[0012] Furthermore, the control module is used to determine the refrigerant superheat based on the refrigerant temperature and pressure detected by the temperature and pressure sensor, and to control the operating status of the electronic valve assembly and the electrically controlled shut-off valve assembly based on the refrigerant superheat.

[0013] Furthermore, it also includes fan components; The fan assembly is used for heat exchange between the condenser, the first evaporator, and the second evaporator; The fan assembly is connected to the control module via communication.

[0014] Furthermore, the fan assembly includes a first fan disposed at the condenser for heat exchange of the condenser.

[0015] Furthermore, the fan assembly includes a second fan disposed at the first evaporator for heat exchange of the first evaporator.

[0016] Furthermore, the fan assembly includes a third fan, which is disposed at the second evaporator for heat exchange of the second evaporator.

[0017] The technical solution of this application also provides a control method for a refrigerant temporary storage and release system for automotive air conditioning system maintenance, applied to the aforementioned automotive air conditioning system refrigerant temporary storage and release system, including: In response to the refrigerant storage signal, the electronic valve assembly and the electronic shut-off valve assembly are switched to the refrigerant storage state, the compressor is started, and the refrigerant in the first refrigerant circulation path is transferred to the second refrigerant circulation path and temporarily stored in the second evaporator and the pipeline connected to the second evaporator. Obtain the refrigerant temperature and refrigerant pressure, and determine the superheat of the temporarily stored refrigerant based on the refrigerant temperature and refrigerant pressure; Determine whether the temporary storage of the refrigerant has been completed based on the superheat of the temporarily stored refrigerant. If the temporary storage is completed, the electronically controlled shut-off valve assembly will close the refrigerant flow channel of the second refrigerant circulation path. In response to the refrigerant release signal, the electronic valve assembly and the electronic shut-off valve assembly are switched to the refrigerant release state, and the compressor is started, so that the refrigerant temporarily stored in the second vaporizer and the pipeline connected to the second evaporator is transferred to the first refrigerant circulation path. Obtain the refrigerant temperature and refrigerant pressure, and determine the degree of refrigerant superheat to be released based on the refrigerant temperature and refrigerant pressure; Determine whether the temporarily stored refrigerant has been completely released based on the superheat of the released refrigerant; Once the release is complete, the electronic valve assembly and the electrically controlled shut-off valve will return to normal cooling status.

[0018] Furthermore, the electronic valve assembly and the electronically controlled shut-off valve assembly are switched to a refrigerant temporary storage state, including: Control the first electrically controlled shut-off valve to close, control the second electrically controlled shut-off valve to open, control the first electronic valve to close, and control the second electronic valve to open.

[0019] Furthermore, after the electronic valve assembly and the electronically controlled shut-off valve assembly switch to the refrigerant temporary storage state, the system also includes: The third fan is activated to dissipate heat from the second evaporator; Control the first and second fans to stop running.

[0020] Furthermore, determining whether the temporary storage of the refrigerant has been completed based on the superheat of the temporarily stored refrigerant includes: Compare the temporary refrigerant superheat with the preset temporary storage threshold; If the superheat of the temporarily stored refrigerant is greater than the preset temporary storage threshold, then the temporary storage of the refrigerant is considered complete.

[0021] Furthermore, the electronic valve assembly and the electronically controlled shut-off valve assembly are switched to the refrigerant release state, including: The first and second electrically controlled shut-off valves are closed, and the first and second electronic valves are opened, so that the refrigerant in the second evaporator and the pipeline connected to the second evaporator enters the first refrigerant circulation path.

[0022] Furthermore, after the electronic valve assembly and the electrically controlled shut-off valve assembly switch to the refrigerant release state, the system also includes: The first, second, and third fans are started to exchange heat with the condenser, the first evaporator, and the second evaporator, respectively.

[0023] Furthermore, determining whether the temporarily stored refrigerant has been completely released based on the superheat of the released refrigerant includes: Compare the released refrigerant superheat with a preset release threshold; If the superheat of the released refrigerant exceeds the preset release threshold, then the temporarily stored refrigerant is determined to have been released.

[0024] The technical solution of this application also provides a storage medium that stores computer instructions. When the computer executes the computer instructions, it is used to perform the control method for a refrigerant temporary storage and release system for automotive air conditioning system maintenance as described above.

[0025] The technical solution of this application also provides an electronic device, including at least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform a control method for a refrigerant temporary storage and release system for automotive air conditioning system maintenance as described above.

[0026] The technical solution of this application also provides a computer program product, including a computer program / instruction, characterized in that, when the computer program / instruction is executed by a processor, it implements a control method for a refrigerant temporary storage and release system for automotive air conditioning system maintenance as described in any of the preceding claims.

[0027] The above technical solution has the following beneficial effects: This application discloses a refrigerant temporary storage and release system and its control method for automotive air conditioning system maintenance. The system establishes a first refrigerant circulation path consisting of a compressor, condenser, and a first evaporator, and a second refrigerant circulation path formed by a second evaporator connected in parallel with the first evaporator. Electronic valve assemblies and electronically controlled shut-off valve assemblies are used to switch between the two circulation paths. Before vehicle maintenance, the existing refrigerant is transferred to the second evaporator and its connected piping for temporary storage. After maintenance, the temporarily stored refrigerant is released back into the first refrigerant circulation path. This system achieves refrigerant temporary storage and reuse without the need for external dedicated refrigerant recovery equipment, avoiding refrigerant emissions during maintenance, reducing refrigerant waste and environmental pollution, and lowering maintenance costs associated with refrigerant refilling during vehicle maintenance. This improves the convenience, resource utilization, and environmental friendliness of automotive air conditioning system maintenance. Attached Figure Description

[0028] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. In the drawings: Figure 1 This is a schematic diagram of a refrigerant storage and release system for automotive air conditioning system maintenance, according to one embodiment of this application. Figure 2 This is a flowchart of a control method for a refrigerant storage and release system for automotive air conditioning system maintenance, according to one embodiment of this application. Figure 3 This is a flowchart of a control method for a refrigerant temporary storage and release system in an automotive air conditioning system, according to another embodiment of this application. Figure 4 This is a schematic diagram of a refrigerant storage and release system for automotive air conditioning system maintenance, according to another embodiment of this application. Figure 5 This is a schematic diagram of the hardware structure of an electronic device in one embodiment of this application.

[0029] Reference table for attached figures: Compressor 1, condenser 2, first evaporator 3, second evaporator 4; Electronic valve assembly 5: First electronic valve 51, second electronic valve 52; Electrically controlled shut-off valve assembly 6: First electrically controlled shut-off valve 61, Second electrically controlled shut-off valve 62; Temperature and pressure sensors 7: First temperature and pressure sensor 71, second temperature and pressure sensor 72, third temperature and pressure sensor 73, fourth temperature and pressure sensor 74; Fan assembly 8: First fan 81, second fan 82, third fan 83. Detailed Implementation

[0030] The specific embodiments of this application will be further described below with reference to the accompanying drawings.

[0031] It is readily understood that, based on the technical solution of this application, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of this application. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this application and should not be considered as the entirety of this application or as limitations or restrictions on the technical solution of the application.

[0032] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meanings of the above in this application according to the specific circumstances.

[0034] like Figure 1 As shown in one embodiment of this application, a refrigerant storage and release system for automotive air conditioning system maintenance includes a compressor 1, a condenser 2, a first evaporator 3, a second evaporator 4, an electronic valve assembly 5, an electronically controlled shut-off valve assembly 6, and a control module. Compressor 1, condenser 2 and first evaporator 3 constitute the first refrigerant circulation path, and second evaporator 4 is connected in parallel with first evaporator 3, and together with compressor 1 and condenser 2, constitute the second refrigerant circulation path. Electronic valve assembly 5 is used to control the refrigerant flow status in the first refrigerant circulation path and the second refrigerant circulation path; The electrically controlled shut-off valve assembly 6 is used to control the refrigerant flow status between the second refrigerant circulation path and the compressor 1, and between the condenser 2 and the first and second refrigerant circulation paths; The control module is communicatively connected to the compressor 1, the electronic valve assembly 5, and the electrically controlled shut-off valve assembly 6, and is used to control the electronic valve assembly 5 and the electrically controlled shut-off valve assembly 6 to switch to the refrigerant storage state or the refrigerant release state.

[0035] In this embodiment, the automotive air conditioning system refrigerant storage and release system includes a compressor 1, a condenser 2, a first evaporator 3, a second evaporator 4, an electronic valve assembly 5, an electronically controlled shut-off valve assembly 6, and a control module. The first evaporator 3 is the evaporator corresponding to the vehicle's passenger compartment air conditioning system, used to allow the refrigerant to absorb heat from the passenger compartment air during normal cooling, thereby cooling the passenger compartment. The second evaporator 4 is the evaporator corresponding to the vehicle's onboard refrigerator, used to allow the refrigerant to absorb heat from the refrigerator's interior during normal cooling, thereby cooling the interior space of the onboard refrigerator.

[0036] Compressor 1, condenser 2, and first evaporator 3 constitute the first refrigerant circulation path. Second evaporator 4 is connected in parallel with first evaporator 3 and, together with compressor 1 and condenser 2, constitutes the second refrigerant circulation path. By setting up two refrigerant circulation paths, second evaporator 4 can serve as an intermediate storage component during the temporary storage and release of refrigerant without altering the basic structure of the first refrigerant circulation path. This allows for the reconstruction of the refrigerant flow path during maintenance using the vehicle's own refrigeration system.

[0037] When the vehicle's air conditioning system requires maintenance, the control module switches the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 to a refrigerant storage state. This allows the refrigerant in the first refrigerant circulation path to be transferred to the second refrigerant circulation path under the drive of the compressor 1, and enters the second evaporator 4 and the pipeline connected to the second evaporator 4. At this time, the electronically controlled shut-off valve assembly 6 isolates the corresponding position in the second refrigerant circulation path, keeping the transferred refrigerant within a preset storage area. Therefore, when disconnecting the relevant pipelines of the air conditioning system for maintenance, it is not necessary to directly discharge the original refrigerant to the outside, nor is it necessary to rely on external dedicated refrigerant recovery equipment for recovery.

[0038] After vehicle maintenance is completed, the control module switches the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 to the refrigerant release state, allowing the temporarily stored refrigerant in the second evaporator 4 and its connecting pipes to re-enter the first refrigerant circulation path and re-participate in the refrigerant cycle under the action of the compressor 1. Once the temporarily stored refrigerant has been largely released, the control module further controls the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 to return to normal cooling mode, restoring the first and second refrigerant circulation paths to normal operation. This allows for on-board temporary storage of refrigerant before vehicle maintenance and reuse of the stored refrigerant after maintenance, avoiding refrigerant loss due to disassembly. It eliminates the need for bulky and inconvenient external refrigerant recovery equipment, reducing resource waste and environmental pollution caused by refrigerant emissions during maintenance, while also lowering the cost of refilling refrigerant after maintenance and improving the convenience of vehicle air conditioning system maintenance.

[0039] like Figure 1 As shown, in one embodiment, the electronic valve assembly 5 includes a first electronic valve 51; The first electronic valve 51 is disposed in the first refrigerant circulation path; The first electronic valve 51 is connected to the control module for communication.

[0040] In this embodiment, the electronic valve assembly 5 includes a first electronic valve 51, which is disposed in the first refrigerant circulation path and at the inlet end of the first evaporator 3, and is communicatively connected to the control module. The control module can send control commands to the first electronic valve 51 according to the operating status of the vehicle air conditioning system to adjust the refrigerant flow state in the first refrigerant circulation path, so that the first refrigerant circulation path can switch accordingly according to different working stages such as refrigerant storage, refrigerant release, and normal cooling.

[0041] This embodiment, by setting a first electronic valve 51 that is communicatively connected to the control module, can actively control the flow of refrigerant in the first refrigerant circulation path, and work in conjunction with the electronically controlled shut-off valve assembly 6 to change the flow path of the refrigerant, thereby controlling the transfer of refrigerant between the first and second refrigerant circulation paths, improving the controllability of the refrigerant storage and release process, and reducing the possible flow and leakage of refrigerant during maintenance.

[0042] like Figure 1 As shown, in one embodiment, the electronic valve assembly 5 further includes a second electronic valve 52; The second electronic valve 52 is installed in the second refrigerant circulation path; The second electronic valve 52 is connected to the control module for communication.

[0043] In this embodiment, the electronic valve assembly 5 further includes a second electronic valve 52, which is disposed in the second refrigerant circulation path and at the inlet end of the second evaporator 4, and is communicatively connected to the control module. The control module can send control commands to the second electronic valve 52 according to the current operating state of the vehicle air conditioning system to adjust the refrigerant flow state in the second refrigerant circulation path, so that the refrigerant can enter or leave the second evaporator 4.

[0044] In this embodiment, by setting a second electronic valve 52, it can work with the first electronic valve 51 to independently adjust the refrigerant flow state in the first and second refrigerant circulation paths, and cooperate with the electronically controlled shut-off valve assembly 6 to switch the refrigerant flow path. This allows the second evaporator 4 to be used as a refrigerant storage area during maintenance and as a refrigerant release path after maintenance, thereby improving the control accuracy of the refrigerant storage and release process and the stability of system operation.

[0045] like Figure 1 As shown, in another embodiment, the electrically controlled shut-off valve assembly 6 includes a first electrically controlled shut-off valve 61; The first electrically controlled shut-off valve 61 is located at the outlet end of the second evaporator 4; The first electrically controlled shut-off valve 61 is connected to the control module via communication.

[0046] In this embodiment, the electronically controlled shut-off valve assembly 6 includes a first electronically controlled shut-off valve 61, which is disposed at the outlet end of the second evaporator 4 and is communicatively connected to the control module. The control module controls the first electronically controlled shut-off valve 61 to open or close according to the operating state of the vehicle's air conditioning system. During refrigerant storage, the control module controls the first electronically controlled shut-off valve 61 to close, thereby blocking the refrigerant flow at the outlet side of the second evaporator 4, so that the refrigerant entering the second evaporator 4 can be retained in the second evaporator 4 and the pipeline between it and the first electronically controlled shut-off valve 61. During refrigerant release, the control module controls the first electronically controlled shut-off valve 61 to switch its operating state, so that the temporarily stored refrigerant can be released into the first refrigerant circulation path.

[0047] This embodiment uses a first electrically controlled shut-off valve 61 at the outlet of the second evaporator 4 to isolate and release the refrigerant storage area formed by the second evaporator 4 and its connecting pipelines by using the on / off state of the first electrically controlled shut-off valve 61. This can prevent the refrigerant temporarily stored during maintenance from flowing out. While ensuring the stable storage of refrigerant, it provides controllable flow conditions for the release of refrigerant after maintenance is completed, reducing refrigerant leakage and waste, and improving the reliability of the system maintenance process.

[0048] like Figure 1 As shown, in one embodiment, the electrically controlled shut-off valve assembly 6 further includes a second electrically controlled shut-off valve 62; The second electrically controlled shut-off valve 62 is installed at the outlet end of the condenser 2; The second electrically controlled shut-off valve 62 is connected to the control module via communication.

[0049] In this embodiment, the electrically controlled shut-off valve assembly 6 further includes a second electrically controlled shut-off valve 62, which is disposed at the outlet end of the condenser 2 and is communicatively connected to the control module. The control module controls the opening and closing of the second electrically controlled shut-off valve 62 according to the operating state of the vehicle's air conditioning system, thereby controlling the refrigerant flow state between the outlet side of the condenser 2 and the first and second refrigerant circulation paths. During refrigerant storage, the control module controls the second electrically controlled shut-off valve 62 to be in the open state, allowing the refrigerant output from the condenser 2 to enter the second refrigerant circulation path; during refrigerant release and system state switching, the control module adjusts the operating state of the second electrically controlled shut-off valve 62 accordingly, thereby cooperating with other valves to change the refrigerant flow path.

[0050] This embodiment controls the refrigerant flow on the outlet side of condenser 2 by setting a second electrically controlled shut-off valve 62 at the outlet end of condenser 2. It works in conjunction with the first electrically controlled shut-off valve 61 set at the outlet end of second evaporator 4 to achieve on / off control of both ends of the second refrigerant circulation path, thereby forming a relatively independent refrigerant storage area. After maintenance is completed, a release path for the stored refrigerant is established, improving the controllability of the refrigerant storage and release process and reducing refrigerant leakage and ineffective discharge during maintenance.

[0051] In one embodiment, the second evaporator 4 and the pipeline between the second evaporator 4 and the first electrically controlled shut-off valve 61 form a refrigerant storage area. The first electrically controlled shut-off valve 61 is used to isolate the refrigerant storage area.

[0052] In this embodiment, the second evaporator 4 and the pipeline between the second evaporator 4 and the first electrically controlled shut-off valve 61 form a refrigerant storage area. Before maintenance of the vehicle air conditioning system, the control module controls the first electrically controlled shut-off valve 61 to close, isolating the outlet side of the second evaporator 4 from the subsequent refrigerant flow path, thereby allowing the refrigerant entering the second evaporator 4 to be temporarily retained within the body of the second evaporator 4 and the pipeline between it and the first electrically controlled shut-off valve 61. After the vehicle air conditioning system maintenance is completed, the control module controls the first electrically controlled shut-off valve 61 to switch its operating state according to the refrigerant release requirement, reconnecting the refrigerant storage area with the corresponding refrigerant circulation path, thereby releasing the temporarily stored refrigerant into the refrigerant circulation system.

[0053] This embodiment uses the second evaporator 4 and part of its connecting pipes as a refrigerant temporary storage area, utilizing the vehicle's existing refrigeration system components to form an on-board refrigerant storage space, eliminating the need for an additional independent refrigerant storage tank or external recovery equipment. Simultaneously, the first electronically controlled shut-off valve 61 isolates the refrigerant temporary storage area, reducing the possibility of the stored refrigerant flowing towards the pipes to be disassembled during maintenance. This ensures the refrigerant remains within the preset area during vehicle maintenance and is released again along a predetermined path after maintenance, thereby reducing refrigerant loss and environmental emissions, and lowering maintenance costs.

[0054] like Figure 1 As shown, in one embodiment, a temperature and pressure sensor 7 for detecting refrigerant temperature and pressure is also included; The temperature and pressure sensor 7 is connected to the control module and is used to send the detected refrigerant temperature and pressure to the control module.

[0055] In this embodiment, the system also includes a temperature and pressure sensor 7 for detecting refrigerant temperature and pressure. The temperature and pressure sensor 7 is communicatively connected to the control module and is used to send the detected refrigerant temperature and pressure to the control module. After receiving the refrigerant temperature and pressure output by the temperature and pressure sensor 7, the control module can determine the refrigerant's state parameters based on the current temperature and pressure of the refrigerant, and determine the operating status of the refrigerant storage process and release process based on the state parameters, thereby providing a basis for the control of the electronic valve assembly 5, the electrically controlled shut-off valve assembly 6, and the compressor 1.

[0056] This embodiment uses a temperature and pressure sensor 7 to monitor the refrigerant's state during temporary storage and release in real time. This allows the control module to determine whether the process is complete based on the actual refrigerant state rather than just the preset running time. This improves the accuracy of the judgment and the reliability of the control during the temporary storage and release of the refrigerant, reduces refrigerant loss caused by incomplete or excessive transfer, and ensures that the refrigerant can be stably restored to the vehicle's air conditioning system after maintenance.

[0057] like Figure 1 As shown, in one embodiment, the temperature and pressure sensor 7 includes a first temperature and pressure sensor 71 and a second temperature and pressure sensor 72; The first temperature and pressure sensor 71 is located at the outlet end of the condenser 2, and the second temperature and pressure sensor 72 is located at the inlet end of the second evaporator 4.

[0058] In this embodiment, the temperature and pressure sensor 7 includes a first temperature and pressure sensor 71 and a second temperature and pressure sensor 72. The first temperature and pressure sensor 71 is located at the outlet end of the condenser 2 and is used to detect the temperature and pressure of the refrigerant at the outlet side of the condenser 2. The second temperature and pressure sensor 72 is located at the inlet end of the second evaporator 4 and is used to detect the temperature and pressure of the refrigerant at the inlet side of the second evaporator 4. The control module acquires the temperature and pressure data output by the first temperature and pressure sensor 71 and the second temperature and pressure sensor 72 respectively, and judges the flow and state changes of the refrigerant in the first refrigerant circulation path and the second refrigerant circulation path based on the detection results at different locations.

[0059] In this embodiment, temperature and pressure sensors 7 are respectively installed at the outlet end of the condenser 2 and the inlet end of the second evaporator 4. These sensors can detect the state of the refrigerant before and after it enters the second refrigerant circulation path at different locations. This provides the control module with a more accurate state basis for judging the temporary storage and release process of the refrigerant, thereby improving the controllability of the refrigerant transfer process and the accuracy of state judgment, reducing refrigerant loss caused by insufficient refrigerant transfer or abnormal flow, and improving the stability of the refrigerant re-release process after maintenance.

[0060] In one embodiment, the control module is used to determine the refrigerant superheat based on the refrigerant temperature and pressure detected by the temperature and pressure sensor 7, and to control the operating state of the electronic valve assembly 5 and the electrically controlled shut-off valve assembly 6 based on the refrigerant superheat.

[0061] In this embodiment, the control module determines the refrigerant superheat based on the refrigerant temperature and pressure detected by the temperature and pressure sensor 7, and controls the operating state of the electronic valve assembly 5 and the electrically controlled shut-off valve assembly 6 based on the refrigerant superheat. Specifically, the control module determines the current state of the refrigerant based on the refrigerant temperature detected by the temperature and pressure sensor 7 and the corresponding pressure, and uses the determined superheat as the basis for judging the state of the refrigerant storage process and the release process. When the refrigerant superheat reaches a preset condition, the control module determines that the corresponding refrigerant transfer process has reached a preset state, and controls the electronic valve assembly 5 and the electrically controlled shut-off valve assembly 6 to switch accordingly.

[0062] This embodiment uses the refrigerant superheat to coordinate the control of the electronic valve assembly 5 and the electrically controlled shut-off valve assembly 6. This allows the actual thermodynamic state of the refrigerant to be incorporated into the control of the temporary storage and release process, avoiding valve switching based solely on fixed operating times and improving the accuracy of determining when refrigerant storage and release are complete. Simultaneously, the linkage between temperature and pressure detection and the control of the electronic valve assembly 5 and the electrically controlled shut-off valve assembly 6 reduces refrigerant loss caused by insufficient or excessive refrigerant transfer, thus improving the stability and reliability of the refrigerant storage and release process.

[0063] like Figure 1As shown, in another embodiment, a fan assembly 8 is also included; The fan assembly 8 is used for heat exchange between the condenser 2, the first evaporator 3, and the second evaporator 4; Fan assembly 8 is connected to the control module via communication.

[0064] In this embodiment, the system also includes a fan assembly 8, which is used for heat exchange between the condenser 2, the first evaporator 3, and the second evaporator 4, and is communicatively connected to the control module. The control module controls the fan assembly 8 according to the current operating state of the automotive air conditioning system, causing the condenser 2, the first evaporator 3, and the second evaporator 4 to perform corresponding heat exchange operations during refrigerant storage, refrigerant release, and normal cooling processes, thereby maintaining the normal operation of each heat exchange component in accordance with changes in the refrigerant circulation state.

[0065] In this embodiment, by setting up a fan assembly 8 that is communicatively connected to the control module, the heat exchange process of each heat exchange component can be adjusted according to different working stages. This allows the second evaporator 4 to exchange heat in a timely manner during the refrigerant storage process, promoting the refrigerant state transition. It also ensures that the condenser 2 and evaporator have stable heat exchange capabilities during the refrigerant release and normal cooling processes, thereby improving the stability of the refrigerant storage and release process and ensuring the normal cooling performance of the automotive air conditioning system after maintenance.

[0066] like Figure 1 As shown, in one embodiment, the fan assembly 8 includes a first fan 81, which is disposed at the condenser 2 for heat exchange of the condenser 2.

[0067] In this embodiment, the fan assembly 8 includes a first fan 81, which is disposed at the condenser 2 for heat exchange. When the first fan 81 is running, external air flows through the condenser 2, thereby carrying away the heat released by the refrigerant in the condenser 2, promoting the transformation of the high-temperature, high-pressure gaseous refrigerant into a liquid refrigerant, and maintaining the normal heat exchange process of the condenser 2. Under different operating states such as refrigerant temporary storage, release, and normal cooling, the control module can control the first fan 81 to run or stop according to the system operation requirements.

[0068] In this embodiment, the first fan 81 is set to perform forced heat exchange on the condenser 2, which can improve the heat dissipation capacity of the condenser 2, so that the high-temperature and high-pressure refrigerant discharged by the compressor 1 can be condensed in time, improving the liquefaction efficiency and circulation stability of the refrigerant; at the same time, during the refrigerant release process, the refrigerant that re-enters the circulation will be condensed in time and stored in the refrigerant circulation path, thereby improving the stability of the refrigerant release process and ensuring that the air conditioning system can resume normal cooling operation after maintenance.

[0069] like Figure 1As shown, in one embodiment, the fan assembly 8 includes a second fan 82 disposed at the first evaporator 3 for heat exchange of the first evaporator 3.

[0070] In this embodiment, the fan assembly 8 includes a second fan 82, which is disposed at the first evaporator 3 for heat exchange. When the second fan 82 is running, air flows through the first evaporator 3, thereby promoting heat exchange between the first evaporator 3 and the outside air, allowing the refrigerant entering the first evaporator 3 to absorb heat from the air and undergo a phase change. During the refrigerant release process, the control module controls the operation of the second fan 82 according to the system operating status, providing corresponding heat exchange conditions for the temporary refrigerant to re-enter the first refrigerant circulation path for evaporation and heat exchange.

[0071] This embodiment improves the heat exchange efficiency of the first evaporator 3 by setting a second fan 82 to force heat exchange on the first evaporator 3, so that the refrigerant can fully absorb heat and complete evaporation, thereby reducing the possibility of insufficiently evaporated liquid refrigerant entering the compressor 1 and reducing the risk of compressor 1 malfunctioning; at the same time, it improves the stability of gas-liquid conversion during the refrigerant release process, ensuring that the temporarily stored refrigerant can smoothly re-enter the first refrigerant circulation path, and also ensuring that the normal cooling performance of the vehicle air conditioning system is restored after maintenance.

[0072] like Figure 1 As shown, in one embodiment, the fan assembly 8 includes a third fan 83 disposed at the second evaporator 4 for heat exchange of the second evaporator 4.

[0073] In this embodiment, the fan assembly 8 includes a third fan 83, which is disposed at the second evaporator 4 for heat exchange. When the third fan 83 is running, external air flows through the second evaporator 4, thereby promoting heat exchange between the second evaporator 4 and the external air. During refrigerant storage, the third fan 83 removes heat from the refrigerant in the second evaporator 4, causing the gas-liquid two-phase refrigerant entering the second evaporator 4 to further release heat and gradually condense into liquid refrigerant, thus enabling the liquid refrigerant to be temporarily stored in the second evaporator 4 and its connecting pipes. During refrigerant release, the third fan 83 can operate according to the control requirements of the control module to coordinate with the release process of the temporarily stored refrigerant.

[0074] This embodiment improves the heat dissipation capacity of the second evaporator 4 by setting a third fan 83 to exchange heat with the second evaporator 4, promotes the condensation of refrigerant during the temporary storage process, and facilitates the conversion of gaseous or gas-liquid two-phase refrigerant into liquid and storage in the preset temporary storage area. This improves the refrigerant storage capacity of the vehicle's own refrigeration system and reduces the risk of flow and leakage caused by insufficient condensation of refrigerant. At the same time, it provides a stable temporary storage state for subsequent refrigerant release and improves the reliability of refrigerant transfer during the entire maintenance process.

[0075] like Figure 2 The flowchart shown is a control method for a refrigerant temporary storage and release system in an automotive air conditioning system according to an embodiment of this application, including: Step S101: In response to the refrigerant temporary storage signal, control the electronic valve assembly 5 and the electronic shut-off valve assembly 6 to switch to the refrigerant temporary storage state, start the compressor 1, so that the refrigerant in the first refrigerant circulation path is transferred to the second refrigerant circulation path and temporarily stored in the second evaporator 4 and the pipeline connected to the second evaporator 4. Step S102: Obtain the refrigerant temperature and refrigerant pressure, and determine the superheat of the temporarily stored refrigerant based on the refrigerant temperature and refrigerant pressure; Step S103: Determine whether the temporary storage of the refrigerant has been completed based on the superheat of the temporarily stored refrigerant; Step S104: If temporary storage is completed, control the electronic shut-off valve assembly 6 to close the refrigerant flow channel of the second refrigerant circulation path.

[0076] Specifically, in step S101, in response to the refrigerant temporary storage signal, the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 are switched to the refrigerant temporary storage state, and the compressor 1 is started, causing the refrigerant in the first refrigerant circulation path to transfer to the second refrigerant circulation path and temporarily store it in the second evaporator 4 and the pipeline connected to the second evaporator 4. The refrigerant temporary storage signal can be input by maintenance personnel before disassembling or replacing parts in the automotive air conditioning system, or it can be generated by the control module after the vehicle enters a preset maintenance mode.

[0077] In one specific embodiment, the vehicle refrigerator door is opened before refrigerant is temporarily stored, allowing the second evaporator 4 to exchange heat fully with the outside air; the control module controls the first electronic shut-off valve 61 and the first electronic valve 51 to close, controls the second electronic shut-off valve 62 and the second electronic valve 52 to open, and simultaneously starts the third fan 83 and the compressor 1 located at the second evaporator 4, and controls the first fan 81 located at the condenser 2 and the second fan 82 located at the first evaporator 3 to stop running.

[0078] During refrigerant storage, compressor 1 draws refrigerant from the pipeline between itself and the first evaporator 3 and the second evaporator 4, compresses the drawn-in refrigerant, and discharges it. The high-pressure superheated gaseous refrigerant discharged from compressor 1, along with the refrigerant in condenser 2, is transferred to the second refrigerant circulation path of the second evaporator 4 under pressure difference. At this time, the third fan 83 is running, dissipating heat from the refrigerant at the second evaporator 4 to the external environment through the open refrigerator door. This allows the second evaporator 4 to perform condensation and heat exchange on the refrigerant during storage, causing the gaseous or gas-liquid two-phase refrigerant entering the second evaporator 4 to release heat and gradually transform into liquid refrigerant. The first electrically controlled shut-off valve 61 is closed, confining the transformed liquid refrigerant within the body of the second evaporator 4 and the pipeline between the second evaporator 4 and the first electrically controlled shut-off valve 61, thus utilizing the vehicle's existing second evaporator 4 and its pipeline to form a refrigerant storage area.

[0079] In step S102, during the continuous transfer of refrigerant to the second evaporator 4 and its connecting pipes, the control module acquires the refrigerant temperature and pressure detected by the temperature and pressure sensor 7, and determines the superheat of the temporarily stored refrigerant based on the refrigerant temperature and pressure. The corresponding refrigerant saturation temperature under the detected refrigerant pressure can be determined, and the superheat of the temporarily stored refrigerant can be determined based on the difference between the actual detected refrigerant temperature and the saturation temperature. A table showing the correspondence between refrigerant pressure and saturation temperature can be pre-stored in the control module according to the type of refrigerant used in the vehicle, enabling the control module to obtain the corresponding superheat of the temporarily stored refrigerant based on the real-time collected temperature and pressure.

[0080] In step S103, the storage status of the refrigerant is determined based on the superheat of the temporarily stored refrigerant. As the compressor 1 continues to draw and transfer the refrigerant, the refrigerant in the first refrigerant circulation path and related pipelines gradually concentrates in the storage area where the second evaporator 4 is located. The liquid refrigerant gradually decreases, and the refrigerant state at the corresponding detection location changes. Therefore, the change in the superheat of the temporarily stored refrigerant can be used to characterize the progress of the temporary storage of the refrigerant.

[0081] In step S104, if it is determined that the refrigerant has completed temporary storage, the electronically controlled shut-off valve assembly 6 is controlled to close the refrigerant flow channel of the second refrigerant circulation path, thereby isolating the refrigerant that has been transferred to the second evaporator 4 and its connecting pipes, preventing the temporarily stored refrigerant from flowing back to the air conditioning system area that needs to be disassembled or repaired. Then, the corresponding components or pipes in the automotive air conditioning system can be disassembled, replaced, or repaired according to the maintenance needs, thereby avoiding the direct discharge of the original refrigerant into the external environment during the maintenance process.

[0082] like Figure 3As shown, a flowchart of a control method for a refrigerant temporary storage and release system in an automotive air conditioning system according to another embodiment of this application is presented, including: Step S201: In response to the refrigerant release signal, control the electronic valve assembly 5 and the electronic shut-off valve assembly 6 to switch to the refrigerant release state, start the compressor 1, and transfer the refrigerant temporarily stored in the second vaporizer and the pipeline connected to the second evaporator 4 to the first refrigerant circulation path. Step S202: Obtain the refrigerant temperature and refrigerant pressure, and determine the refrigerant superheat based on the refrigerant temperature and refrigerant pressure; Step S203: Determine whether the temporarily stored refrigerant has been completely released based on the superheat of the released refrigerant; Step S204: If the release is completed, control the electronic valve assembly 5 and the electronic shut-off valve to return to normal cooling state.

[0083] In step S201, before performing the refrigerant release operation, a vacuum pump can be used to evacuate the automotive air conditioning system after maintenance to remove air and moisture that entered the corresponding pipes and components during the maintenance process. Subsequently, in response to the refrigerant release signal, the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 are switched to the refrigerant release state, and the compressor 1 is started, causing the refrigerant temporarily stored in the second evaporator 4 and the pipes connected to the second evaporator 4 to transfer to the first refrigerant circulation path.

[0084] In one specific embodiment, during the refrigerant release operation, the vehicle refrigerator door is opened. The control module controls the first electrically controlled shut-off valve 61 and the second electrically controlled shut-off valve 62 to close, controls the first electronic valve 51 and the second electronic valve 52 to open, and starts the first fan 81, the second fan 82, the third fan 83, and the compressor 1. After the compressor 1 starts running, under the action of the pressure difference, it draws in the liquid refrigerant temporarily stored in the second evaporator 4 and the pipeline between the second evaporator 4 and the first electrically controlled shut-off valve 61. The temporarily stored liquid refrigerant forms a gas-liquid two-phase refrigerant during the flow process and enters the first evaporator 3. The second fan 82 drives air to flow through the first evaporator 3, causing the gas-liquid two-phase refrigerant to absorb heat in the first evaporator 3 and gradually evaporate into superheated gaseous refrigerant, thereby reducing the possibility of liquid refrigerant directly entering the compressor 1 and causing liquid slugging.

[0085] Furthermore, after the compressor 1 draws in the low-temperature, low-pressure gaseous refrigerant, it compresses it into a high-temperature, high-pressure gaseous refrigerant and delivers it to the condenser 2. The first fan 81 is in operation, enhancing heat exchange between the condenser 2 and the outside air, causing the high-temperature, high-pressure gaseous refrigerant to release heat within the condenser 2 and gradually condense into liquid refrigerant. Through the coordinated operation of the compressor 1, the first evaporator 3, the condenser 2, and the corresponding valves, the refrigerant originally temporarily stored in the second evaporator 4 and its connecting pipes is transferred back into the normal refrigerant circulation path of the automotive air conditioning system.

[0086] In step S202, during the refrigerant release process, the control module acquires the refrigerant temperature and pressure detected by the temperature and pressure sensor 7, and determines the refrigerant superheat based on the refrigerant temperature and pressure. The corresponding refrigerant saturation temperature can be determined based on the detected refrigerant pressure, and the actual detected refrigerant temperature is compared with the saturation temperature. The refrigerant superheat is obtained based on the difference between the two. As the liquid refrigerant in the second evaporator 4 and its connecting pipes is continuously extracted, the amount of refrigerant in the temporary storage area gradually decreases, and the thermodynamic state of the refrigerant at the corresponding detection location changes. Therefore, the refrigerant superheat can reflect the release process of the temporarily stored refrigerant.

[0087] In step S203, the release status of the temporarily stored refrigerant is determined based on the refrigerant superheat. The control module compares the real-time determined refrigerant superheat with the preset refrigerant superheat threshold. When the refrigerant superheat is greater than the preset threshold, it indicates that the refrigerant temporarily stored in the second evaporator 4 body and the pipeline between the second evaporator 4 and the first electrically controlled shut-off valve 61 has been transferred, thus confirming that the temporarily stored refrigerant has been released. Determining the release completion status based on the actual thermodynamic state of the refrigerant avoids incomplete release issues caused by relying solely on preset operating times, allowing the refrigerant in the temporary storage area to more fully re-enter the normal refrigerant circulation path.

[0088] In step S204, if it is determined that the temporarily stored refrigerant has been completely released, the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 are restored to normal refrigeration state. The control module controls the first electronically controlled shut-off valve 61 and the second electronically controlled shut-off valve 62 to open, and controls the working state or opening degree of the first electronic valve 51 and the second electronic valve 52 according to normal refrigeration requirements, so that the first refrigerant circulation path and the second refrigerant circulation path are restored to normal connection. Specifically, after the first electronically controlled shut-off valve 61 opens, the outlet of the second evaporator 4 is reconnected to the suction side of the compressor 1; after the second electronically controlled shut-off valve 62 opens, the outlet of the condenser 2 is reconnected to the first refrigerant circulation path and the second refrigerant circulation path, so that the condensed refrigerant can enter the first evaporator 3 and the second evaporator 4 respectively according to normal refrigeration requirements.

[0089] After the refrigerant is released, the first evaporator 3 can resume its function of cooling the vehicle's passenger compartment, and the second evaporator 4 can resume its function of cooling the vehicle's refrigerator, restoring the vehicle's air conditioning system and refrigerator to normal operating conditions. The refrigerant temporarily stored in the vehicle's second evaporator 4 and its piping before maintenance can be reintroduced into the refrigeration cycle after maintenance, eliminating the need for external refrigerant recovery and storage, and eliminating the need to add an equal amount of new refrigerant after maintenance. This reduces refrigerant emissions and waste, and lowers the maintenance costs of the vehicle's air conditioning system.

[0090] In one embodiment, controlling the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 to switch to a refrigerant storage state includes: Control the first electrically controlled shut-off valve 61 to close, control the second electrically controlled shut-off valve 62 to open, control the first electronic valve 51 to close, and control the second electronic valve 52 to open.

[0091] In this embodiment, the electronic valve assembly 5 and the electronic shut-off valve assembly 6 are switched to a refrigerant temporary storage state, including controlling the first electronic shut-off valve 61 to close, controlling the second electronic shut-off valve 62 to open, controlling the first electronic valve 51 to close, and controlling the second electronic valve 52 to open. Specifically, when the first electronic shut-off valve 61 is closed, the outlet side of the second evaporator 4 is isolated from the compressor 1 side, forming a temporary storage area for refrigerant in the second evaporator 4 and the pipeline between it and the first electronic shut-off valve 61. When the first electronic valve 51 is closed, refrigerant is restricted from continuing to enter the first evaporator 3. When the second electronic shut-off valve 62 and the second electronic valve 52 are opened, a refrigerant flow path is established between the outlet side of the condenser 2 and the second evaporator 4, allowing the refrigerant to transfer to the second refrigerant circulation path where the second evaporator 4 is located.

[0092] With the cooperation of the electronic valve assembly 5, the electrically controlled shut-off valve assembly 6, and the compressor 1, the refrigerant in the first refrigerant circulation path and related pipelines is drawn in, and the high-pressure refrigerant discharged from the compressor 1 and the refrigerant in the condenser 2 are transferred to the second evaporator 4 along the second refrigerant circulation path. Furthermore, the refrigerant entering the second evaporator 4 gradually transforms into a liquid state after heat exchange, and is confined to the refrigerant temporary storage area formed by the closed first electrically controlled shut-off valve 61 and its connecting pipelines.

[0093] This embodiment controls the first electronically controlled shut-off valve 61, the second electronically controlled shut-off valve 62, the first electronic valve 51, and the second electronic valve 52 to form a dedicated flow path for refrigerant transfer before maintenance without changing the original refrigeration components of the vehicle. This converts the second evaporator 4 and its connecting pipes into a refrigerant temporary storage area, thereby preventing refrigerant from continuing to flow into the first evaporator 3 or out of the outlet of the second evaporator 4. This improves the controllability of the refrigerant transfer direction and the reliability of the temporary storage process, providing conditions for subsequent air conditioning system maintenance.

[0094] In another embodiment, after the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 are switched to the refrigerant temporary storage state, the system further includes: The third fan 83 is started to dissipate heat from the second evaporator 4; Control the first fan 81 and the second fan 82 to stop running.

[0095] In this embodiment, when switching to the refrigerant temporary storage state, the third fan 83 is started to dissipate heat from the second evaporator 4, and the first fan 81 and the second fan 82 are stopped. During the refrigerant temporary storage process, the vehicle refrigerator door can be opened in advance to allow the second evaporator 4 to exchange heat with the external environment. After the third fan 83 starts, it drives airflow through the second evaporator 4, dissipating the heat carried by the refrigerant entering the second evaporator 4 to the external environment. During the temporary storage process, the second evaporator 4 serves as the main heat dissipation and heat exchange component for the refrigerant, causing the gaseous or gas-liquid two-phase refrigerant entering the second evaporator 4 to gradually condense into liquid refrigerant after heat exchange and heat release, further accumulating in the second evaporator 4 and the pipeline between the second evaporator 4 and the first electrically controlled shut-off valve 61.

[0096] With the first electronic valve 51 closed, the first evaporator 3 does not participate in the current refrigerant storage cycle. Therefore, the second fan 82 is stopped to reduce unnecessary heat exchange and energy consumption on the first evaporator 3 side. The first fan 81 is also stopped to reduce heat dissipation at the condenser 2, allowing the refrigerant discharged from the compressor 1 and the refrigerant in the condenser 2 to continue to transfer to the second evaporator 4 along the preset flow path, and to dissipate heat and condense mainly through the second evaporator 4.

[0097] In another embodiment, determining whether the temporary storage of the refrigerant has been completed based on the superheat of the temporarily stored refrigerant includes: Compare the temporary refrigerant superheat with the preset temporary storage threshold; If the superheat of the temporarily stored refrigerant is greater than the preset temporary storage threshold, then the temporary storage of the refrigerant is considered complete.

[0098] In this embodiment, determining whether the refrigerant has completed temporary storage is based on the superheat of the temporarily stored refrigerant, including comparing the superheat of the temporarily stored refrigerant with a preset temporary storage threshold; if the superheat of the temporarily stored refrigerant is greater than the preset temporary storage threshold, then the refrigerant is determined to have completed temporary storage. This is because as the compressor 1 continues to operate, the refrigerant in the first refrigerant circulation path and related pipelines continuously transfers to the refrigerant temporary storage area where the second evaporator 4 is located. The amount of liquid refrigerant that can continue to participate in the transfer gradually decreases, and the thermodynamic state of the refrigerant at the corresponding detection location changes, causing the superheat of the temporarily stored refrigerant to gradually increase. Therefore, the change in the superheat of the temporarily stored refrigerant can be used to characterize the degree of completion of the refrigerant transfer to the temporary storage area.

[0099] In one specific embodiment, the preset temporary storage threshold can be set to 3°C. The control module continuously acquires the superheat of the temporarily stored refrigerant and compares it with 3°C. When the superheat of the temporarily stored refrigerant is greater than 3°C, it indicates that the refrigerant to be transferred has been substantially transferred to the second evaporator 4 and the pipeline between the second evaporator 4 and the first electrically controlled shut-off valve 61. At this point, the control module determines that the refrigerant has completed temporary storage and further controls the corresponding valve to close, thereby keeping the refrigerant within the refrigerant temporary storage area. 3°C is an exemplary preset temporary storage threshold; in other embodiments, it can be calibrated according to the refrigerant type, system charge amount, and the structure of the refrigerant circulation path.

[0100] This embodiment compares the superheat of the temporarily stored refrigerant with a preset temporary storage threshold. The actual thermodynamic state of the refrigerant can be used to determine the completion status of the temporary storage. Compared with determining the completion status of temporary storage based solely on the running time of compressor 1, this reduces the judgment deviation caused by differences in ambient temperature, refrigerant charge, and system operating status, and improves the accuracy of the refrigerant temporary storage completion judgment. This avoids isolating the temporary storage area before the refrigerant has been fully transferred, thus improving the reliability of the refrigerant temporary storage process.

[0101] In another embodiment, controlling the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 to switch to the refrigerant release state includes: The first electrically controlled shut-off valve 61 and the second electrically controlled shut-off valve 62 are closed, and the first electronic valve 51 and the second electronic valve 52 are opened, so that the refrigerant in the second evaporator 4 and the pipeline connected to the second evaporator 4 enters the first refrigerant circulation path.

[0102] In this embodiment, switching the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 to the refrigerant release state includes controlling the first electronically controlled shut-off valve 61 and the second electronically controlled shut-off valve 62 to close, and controlling the first electronic valve 51 and the second electronic valve 52 to open, allowing the refrigerant in the second evaporator 4 and the pipeline connected to the second evaporator 4 to enter the first refrigerant circulation path. Specifically, after the vehicle's air conditioning system has undergone maintenance and vacuuming, the control module responds to the refrigerant release signal by switching the operating states of each valve. The first electronically controlled shut-off valve 61 and the second electronically controlled shut-off valve 62 close, thereby changing the refrigerant flow path under normal cooling conditions; the first electronic valve 51 and the second electronic valve 52 open, thereby establishing a release path for the refrigerant in the temporary storage area to transfer to the first refrigerant circulation path.

[0103] Then, after compressor 1 starts, a low pressure is formed on the suction side, causing the liquid refrigerant temporarily stored in the body of the second evaporator 4 and in the pipeline between the second evaporator 4 and the first electronically controlled shut-off valve 61 to be gradually drawn out under the action of pressure difference. During the flow process, the temporarily stored refrigerant is throttled and flashed by the corresponding electronic valve to form a gas-liquid two-phase refrigerant, and then enters the first evaporator 3 for heat absorption and heat exchange, so that the gas-liquid two-phase refrigerant gradually evaporates into a gaseous refrigerant and is then drawn into compressor 1; the high-temperature and high-pressure gaseous refrigerant formed by compression by compressor 1 then enters the condenser 2 for condensation, realizing the transfer of the temporarily stored refrigerant from the second evaporator 4 side to the first refrigerant circulation path.

[0104] This embodiment utilizes the vehicle's existing compressor 1, evaporator, and refrigerant piping to construct a refrigerant release path through the coordinated control of the first electrically controlled shut-off valve 61, the second electrically controlled shut-off valve 62, the first electronic valve 51, and the second electronic valve 52. This allows the refrigerant temporarily stored in the second evaporator 4 and its connecting pipes before maintenance to re-enter the refrigerant circulation system in a preset direction. Furthermore, the first evaporator 3 performs evaporation and heat exchange on the refrigerant during the release process, reducing the risk of liquid refrigerant directly entering the compressor 1 and causing liquid slugging. This improves the stability and reliability of the temporarily stored refrigerant release process, ensuring the restoration of the vehicle's air conditioning system's normal cooling function after maintenance.

[0105] In another embodiment, after the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 are switched to the refrigerant release state, the system further includes: The first fan 81, the second fan 82 and the third fan 83 are started to exchange heat with the condenser 2, the first evaporator 3 and the second evaporator 4 respectively.

[0106] In this embodiment, after the electronic valve assembly 5 and the electronically controlled shut-off valve assembly 6 are switched to the refrigerant release state, the system controls the starting of the first fan 81, the second fan 82, and the third fan 83 to exchange heat with the condenser 2, the first evaporator 3, and the second evaporator 4, respectively. During the refrigerant release process, the compressor 1 draws refrigerant temporarily stored in the second evaporator 4 and its connecting pipes. After the third fan 83 starts, it drives airflow through the second evaporator 4, providing heat to the temporarily stored liquid refrigerant in the second evaporator 4, promoting heat absorption and gaseous transformation of the liquid refrigerant, thereby accelerating the release of the temporarily stored refrigerant from the second evaporator 4.

[0107] After the second fan 82 starts, it drives airflow through the first evaporator 3, causing the gas-liquid two-phase refrigerant transferred from the temporary storage area to further absorb heat from the air and evaporate in the first evaporator 3, forming a superheated gaseous refrigerant that then enters the compressor 1. This reduces the possibility of liquid refrigerant directly entering the compressor 1, lowering the risk of liquid slugging in the compressor 1. The compressor 1 compresses the drawn-in gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant and delivers it to the condenser 2. After the first fan 81 starts, it forces heat dissipation into the condenser 2, causing the high-temperature, high-pressure gaseous refrigerant to release heat and condense into liquid refrigerant in the condenser 2, thus realizing the transfer of the temporarily stored refrigerant to the normal refrigerant circulation path.

[0108] In this embodiment, the first fan 81, the second fan 82, and the third fan 83 are activated simultaneously during the refrigerant release state. This enhances the refrigerant release heat exchange of the second evaporator 4, the evaporation heat exchange of the first evaporator 3, and the condensation heat exchange of the condenser 2, respectively. This allows the temporarily stored refrigerant to complete the heat absorption evaporation, compression, and heat release condensation processes sequentially along a preset path. This accelerates the transfer of the refrigerant from the temporary storage area to the normal refrigerant circulation path, improves the refrigerant release efficiency and the stability of the release process, and helps the automotive air conditioning system quickly return to normal cooling status after maintenance.

[0109] In another embodiment, determining whether the temporarily stored refrigerant has been completely released based on the refrigerant superheat includes: Compare the released refrigerant superheat with a preset release threshold; If the superheat of the released refrigerant exceeds the preset release threshold, then the temporarily stored refrigerant is determined to have been released.

[0110] In this embodiment, determining whether the temporarily stored refrigerant has been completely released based on the refrigerant superheat includes comparing the refrigerant superheat with a preset release threshold; if the refrigerant superheat is greater than the preset release threshold, it is determined that the temporarily stored refrigerant has been completely released. During the continuous operation of the compressor 1, the refrigerant temporarily stored in the second evaporator 4 and the pipeline between the second evaporator 4 and the first electrically controlled shut-off valve 61 is continuously drawn in and transferred to the first refrigerant circulation path. As the liquid refrigerant in the temporary storage area gradually decreases, the thermodynamic state of the refrigerant at the corresponding detection location changes, causing the refrigerant superheat to gradually increase. Therefore, the refrigerant superheat can be used to characterize the degree of refrigerant release in the temporary storage area.

[0111] In one specific embodiment, the preset release threshold can be set to 3°C. The control module continuously acquires the superheat of the released refrigerant and compares it with 3°C. When the superheat of the released refrigerant is greater than 3°C, it indicates that the refrigerant temporarily stored in the second evaporator 4 and the pipeline between the second evaporator 4 and the first electrically controlled shut-off valve 61 has been substantially transferred to the first refrigerant circulation path. At this point, it is determined that the temporarily stored refrigerant has been released. It should be noted that 3°C ​​is an exemplary preset release threshold. In other embodiments, it can be calibrated according to the refrigerant type, system charge, temporary storage area volume, and refrigeration system structure.

[0112] This embodiment compares the released refrigerant superheat with a preset release threshold and determines whether the temporarily stored refrigerant has been released based on the actual thermodynamic state of the refrigerant. This avoids insufficient refrigerant release or unnecessary continuous operation of the compressor 1 caused by relying solely on the compressor 1's running time. This improves the accuracy and reliability of the refrigerant release completion status determination, allowing the temporarily stored refrigerant to re-enter the refrigerant circulation system more fully, and providing accurate control basis for the subsequent restoration of the electronic valve assembly 5 and the electrically controlled shut-off valve assembly 6 to the normal cooling state.

[0113] In one specific embodiment, before disassembling or repairing the vehicle's air conditioning system, the refrigerator door of the vehicle refrigerator is first opened. Since the second evaporator 4 is the evaporator corresponding to the vehicle refrigerator, opening the refrigerator door allows the space where the second evaporator 4 is located to be connected to the external environment, thus providing conditions for heat exchange between the second evaporator 4 and the external environment. During the subsequent refrigerant storage process, the third fan 83 drives air to flow through the second evaporator 4, releasing the heat carried by the refrigerant entering the second evaporator 4 to the external environment, enabling the second evaporator 4 to undertake the condensation heat exchange function during the refrigerant storage process.

[0114] Subsequently, the control module controls the first electrically controlled shut-off valve 61 to close, the second electrically controlled shut-off valve 62 to open, the first electronic valve 51 to close, and the second electronic valve 52 to open, and controls the third fan 83 and compressor 1 to start, while the first fan 81 and the second fan 82 stop operating. Specifically, closing the first electronic valve 51 restricts the flow of refrigerant to the first evaporator 3; opening the second electrically controlled shut-off valve 62 and the second electronic valve 52 establishes a flow path between the condenser 2 and the second evaporator 4; closing the first electrically controlled shut-off valve 61 creates a refrigerant storage area in the second evaporator 4 and the piping between the second evaporator 4 and the first electrically controlled shut-off valve 61.

[0115] After compressor 1 starts operating, it draws refrigerant from the first evaporator 3 side, the second evaporator 4 side, and related low-pressure pipelines, compresses the drawn-in refrigerant, and delivers it to condenser 2. The refrigerant on the condenser 2 side is transferred to the second evaporator 4 via the opened second electrically controlled shut-off valve 62 and the second electronic valve 52. During the refrigerant storage process, the second electronic valve 52 is mainly used to establish a refrigerant flow channel; it can be fully open or maintain a preset opening degree, and is not limited to the throttling control method under normal cooling conditions.

[0116] After the refrigerant enters the second evaporator 4, the third fan 83 drives air to flow through the second evaporator 4, causing the second evaporator 4 to function as a condensing heat exchange component in its current state. This causes the gaseous or gas-liquid two-phase refrigerant entering it to release heat and gradually condense into a liquid state. Under the blocking action of the first electrically controlled shut-off valve 61, the condensed refrigerant gradually accumulates and is temporarily stored in the second evaporator 4 and in the pipeline between the second evaporator 4 and the first electrically controlled shut-off valve 61.

[0117] During refrigerant transfer, the control module determines the superheat of the temporarily stored refrigerant based on the refrigerant temperature and pressure detected by the temperature and pressure sensor 7, and compares the superheat with a preset storage threshold. For example, the preset storage threshold is 3°C. When the superheat of the temporarily stored refrigerant exceeds 3°C, it is determined that the refrigerant has completed temporary storage, and the second electronic valve 52 is closed, cutting off the flow channel between the condenser 2 and the second evaporator 4, thus keeping the refrigerant within the storage area. This allows for the transfer and temporary storage of refrigerant using the vehicle's own second evaporator 4 and its piping before maintenance, reducing refrigerant leakage and waste during disassembly and repair.

[0118] In another specific embodiment, after the automotive air conditioning system repair is completed, the refrigerant circulation path is evacuated to remove air and moisture that entered the system during the repair process. As an example, the evacuation time is no less than 30 minutes, and the system vacuum level is lower than 3.5 mbar. A pressure test is then performed to confirm that the system meets the preset sealing requirements. After evacuation, the refrigerator door of the vehicle refrigerator is opened to provide conditions for heat exchange between the second evaporator 4 and the external environment.

[0119] Subsequently, the control module controls the first electrically controlled shut-off valve 61 and the second electrically controlled shut-off valve 62 to close, controls the first electronic valve 51 and the second electronic valve 52 to open, and starts the first fan 81, the second fan 82, the third fan 83, and the compressor 1. A low pressure is formed on the suction side of the compressor 1, causing the liquid refrigerant temporarily stored in the second evaporator 4 and its connecting pipes to be gradually extracted under the pressure difference. The third fan 83 exchanges heat with the second evaporator 4, promoting heat absorption by the liquid refrigerant therein; the released refrigerant enters the first evaporator 3, and continues to exchange heat through the second fan 82, causing the gas-liquid two-phase refrigerant to further evaporate into gaseous refrigerant before entering the compressor 1, thereby reducing the risk of liquid slugging caused by the liquid refrigerant directly entering the compressor 1.

[0120] The compressor 1 compresses the gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant and delivers it to the condenser 2. The first fan 81 dissipates heat from the condenser 2, causing the refrigerant to release heat and gradually condense into a liquid state. This allows the refrigerant that was temporarily stored in the second evaporator 4 and its connecting pipes to gradually transfer to the normal refrigerant circulation path.

[0121] During the refrigerant release process, the control module determines the refrigerant superheat based on the refrigerant temperature and pressure detected by the temperature and pressure sensor 7, and compares it with a preset release threshold. For example, the preset release threshold is 3°C. When the refrigerant superheat exceeds 3°C, the temporarily stored refrigerant is considered released. At this point, the control module opens the first electrically controlled shut-off valve 61 and the second electrically controlled shut-off valve 62, and restores the electronic valve assembly 5 and the electrically controlled shut-off valve assembly 6 to normal refrigeration status. This allows the first evaporator 3 to be reused for passenger compartment refrigeration, and the second evaporator 4 to be reused for vehicle refrigerator refrigeration. Thus, the refrigerant temporarily stored before maintenance can be reintroduced into the normal refrigeration cycle, achieving refrigerant recovery and restoration of the vehicle's air conditioning system and vehicle refrigerator refrigeration functions.

[0122] like Figure 4 As shown, in another specific embodiment, the refrigerant can also be temporarily stored in the condenser 2. The temperature and pressure sensor 7 further includes a third temperature and pressure sensor 73 and a fourth temperature and pressure sensor 74. The third temperature and pressure sensor 73 is located at the outlet end of the first evaporator 3 and is used to detect the refrigerant temperature and pressure at the outlet end of the first evaporator 3. The fourth temperature and pressure sensor 74 is located at the outlet end of the second evaporator 4 and is used to detect the refrigerant temperature and pressure at the outlet end of the second evaporator 4. The third temperature and pressure sensor 73 and the fourth temperature and pressure sensor 74 are respectively communicatively connected to the control module and are used to send the detected refrigerant temperature and pressure to the control module.

[0123] When refrigerant needs to be temporarily stored in condenser 2, the control module controls the first electronic valve 51 and the second electronic valve 52 to open, controls the first electrically controlled shut-off valve 61 to open, and controls the second electrically controlled shut-off valve 62 to close. Simultaneously, the compressor 1, the first fan 81, the second fan 82, and the third fan 83 are started. After the compressor 1 starts running, it draws refrigerant from the first evaporator 3, the second evaporator 4, and the corresponding pipelines, compresses the drawn-in refrigerant into a high-temperature, high-pressure gaseous refrigerant, and then delivers it to condenser 2.

[0124] The first fan 81 operates, enhancing heat exchange between the condenser 2 and the external environment, causing the gaseous refrigerant entering the condenser 2 to release heat and gradually condense into liquid refrigerant. The second fan 82 and the third fan 83 respectively exchange heat with the first evaporator 3 and the second evaporator 4, promoting the absorption and evaporation of liquid refrigerant in the first evaporator 3, the second evaporator 4, and their corresponding pipelines, and transferring it to the condenser 2 under the suction of the compressor 1. Since the second electrically controlled shut-off valve 62 located at the outlet of the condenser 2 is in the closed state, the condensed liquid refrigerant can be restricted from continuing to flow out of the outlet of the condenser 2, thereby causing the refrigerant to gradually accumulate and temporarily store in the condenser 2 and its corresponding connecting pipelines.

[0125] During the refrigerant transfer to condenser 2, the control module determines the refrigerant superheat at the outlet of the first evaporator 3 based on the refrigerant temperature and pressure detected by the third temperature and pressure sensor 73, and determines the refrigerant superheat at the outlet of the second evaporator 4 based on the refrigerant temperature and pressure detected by the fourth temperature and pressure sensor 74. As an example, when both the refrigerant superheat at the outlet of the first evaporator 3 and the outlet of the second evaporator 4 are greater than 3°C, it indicates that the liquid refrigerant in the first evaporator 3, the second evaporator 4, and the corresponding pipelines has essentially completed its transfer to condenser 2. The control module determines that the refrigerant has been temporarily stored and keeps the second electrically controlled shut-off valve 62 closed, keeping the refrigerant within the temporary storage area formed by condenser 2 and its corresponding connecting pipelines. Therefore, depending on the location of the component requiring repair, condenser 2 can be used as a refrigerant temporary storage area, providing another refrigerant storage method for situations requiring repair of the evaporator side or corresponding pipelines.

[0126] Embodiments of this application also provide a storage medium that stores computer instructions, which, when executed by a computer, are used to perform a control method for a refrigerant temporary storage and release system for automotive air conditioning system maintenance as described in any of the preceding embodiments.

[0127] Figure 5 An electronic device according to this application is shown, comprising: At least one processor 501; and, Memory 502 is communicatively connected to at least one processor 501; wherein, The memory 502 stores instructions that can be executed by at least one processor 501, which enables the at least one processor 501 to perform all the steps of a control method for a refrigerant temporary storage and release system for automotive air conditioning system maintenance in any of the foregoing method embodiments.

[0128] Figure 5 Taking a processor 501 as an example: The electronic device may also include an input device 503 and an output device 504.

[0129] The processor 501, memory 502, input device 503 and output device 504 can be connected by a bus or other means. The figure shows an example of connection by bus.

[0130] The memory 502, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to a control method for a refrigerant temporary storage and release system in automotive air conditioning system maintenance, as described in this application embodiment. Figure 2 and Figure 3 The method flow is shown. The processor 501 executes various functional applications and data processing by running non-volatile software programs, instructions, and modules stored in the memory 502, thereby realizing a control method for a refrigerant temporary storage and release system for automotive air conditioning system maintenance as described in the above embodiment.

[0131] Memory 502 may include a program storage area and a data storage area. The program storage area may store an operating system and application programs required for at least one function. The data storage area may store data created based on the use of a control method for a refrigerant storage and release system in an automotive air conditioning system maintenance system. Furthermore, memory 502 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 502 may optionally include memory remotely located relative to processor 501. This remote memory can be connected via a network to means of performing a control method for a refrigerant storage and release system in an automotive air conditioning system maintenance system. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0132] Input device 503 can receive user clicks and generate signal inputs related to user settings and function control of the control method for the refrigerant storage and release system in automotive air conditioning system maintenance. Output device 504 may include display devices such as a display screen.

[0133] One or more modules are stored in memory 502, and when run by one or more processors 501, they execute a control method for a refrigerant temporary storage and release system for automotive air conditioning system maintenance according to any of the above method embodiments.

[0134] Embodiments of this application also provide a computer program product, including a computer program / instructions that, when executed by a processor, implement a control method for a refrigerant temporary storage and release system for automotive air conditioning system maintenance as described in any of the preceding embodiments.

[0135] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0136] The above are merely the principles and preferred embodiments of this application. It should be noted that, for those skilled in the art, implementation methods obtained by appropriately combining the technical solutions disclosed in different embodiments are also included within the technical scope of this invention. Based on the principles of this application, several other modifications can also be made, which should also be considered within the protection scope of this application.

Claims

1. A refrigerant storage and release system for automotive air conditioning system maintenance, characterized in that, It includes a compressor, condenser, first evaporator, second evaporator, electronic valve assembly, electronically controlled shut-off valve assembly, and control module; The compressor, condenser, and first evaporator constitute the first refrigerant circulation path. The second evaporator is connected in parallel with the first evaporator and together with the compressor and condenser, constitutes the second refrigerant circulation path. The electronic valve assembly is used to control the refrigerant flow status in the first and second refrigerant circulation paths; The electronically controlled shut-off valve assembly is used to control the refrigerant flow status between the second refrigerant circulation path and the compressor, and between the condenser and the first and second refrigerant circulation paths; The control module is communicatively connected to the compressor, electronic valve assembly, and electrically controlled shut-off valve assembly, and is used to control the electronic valve assembly and electrically controlled shut-off valve assembly to switch to refrigerant storage state or refrigerant release state.

2. The system according to claim 1, characterized in that, The electronic valve assembly includes a first electronic valve; The first electronic valve is installed in the first refrigerant circulation path; The first electronic valve is connected to the control module via communication.

3. The system according to claim 2, characterized in that, The electronic valve assembly also includes a second electronic valve; The second electronic valve is located in the second refrigerant circulation path; The second electronic valve is connected to the control module via communication.

4. The system according to claim 1, characterized in that, The electrically controlled shut-off valve assembly includes a first electrically controlled shut-off valve; The first electrically controlled shut-off valve is located at the outlet end of the second evaporator; The first electrically controlled shut-off valve is connected to the control module via communication.

5. The system according to claim 4, characterized in that, The electrically controlled shut-off valve assembly also includes a second electrically controlled shut-off valve; The second electrically controlled shut-off valve is installed at the outlet end of the condenser; The second electrically controlled shut-off valve is connected to the control module via communication.

6. The system according to claim 4, characterized in that, The second evaporator and the piping between the second evaporator and the first electrically controlled shut-off valve form a refrigerant storage area. The first electrically controlled shut-off valve is used to isolate the refrigerant storage area.

7. The system according to claim 1, characterized in that, It also includes a temperature and pressure sensor for detecting refrigerant temperature and pressure; The temperature and pressure sensor is connected to the control module and is used to send the detected refrigerant temperature and pressure to the control module.

8. The system according to claim 7, characterized in that, The temperature and pressure sensor includes a first temperature and pressure sensor and a second temperature and pressure sensor; The first temperature and pressure sensor is located at the outlet end of the condenser, and the second temperature and pressure sensor is located at the inlet end of the second evaporator.

9. The system according to claim 7, characterized in that, The control module is used to determine the refrigerant superheat based on the refrigerant temperature and pressure detected by the temperature and pressure sensor, and to control the working status of the electronic valve assembly and the electrically controlled shut-off valve assembly based on the refrigerant superheat.

10. The system according to claim 1, characterized in that, It also includes fan components; The fan assembly is used for heat exchange between the condenser, the first evaporator, and the second evaporator; The fan assembly is connected to the control module via communication.

11. The system according to claim 10, characterized in that, The fan assembly includes a first fan, which is located at the condenser and is used for heat exchange of the condenser.

12. The system according to claim 10, characterized in that, The fan assembly includes a second fan, which is located at the first evaporator and is used for heat exchange in the first evaporator.

13. The system according to claim 10, characterized in that, The fan assembly includes a third fan, which is located at the second evaporator and is used for heat exchange in the second evaporator.

14. A control method for a refrigerant temporary storage and release system in an automotive air conditioning system, characterized in that, The refrigerant storage and release system for automotive air conditioning system maintenance, as described in any one of claims 1-14, comprises: In response to the refrigerant storage signal, the electronic valve assembly and the electronic shut-off valve assembly are switched to the refrigerant storage state, the compressor is started, and the refrigerant in the first refrigerant circulation path is transferred to the second refrigerant circulation path and temporarily stored in the second evaporator and the pipeline connected to the second evaporator. Obtain the refrigerant temperature and refrigerant pressure, and determine the superheat of the temporarily stored refrigerant based on the refrigerant temperature and refrigerant pressure; Determine whether the temporary storage of the refrigerant has been completed based on the superheat of the temporarily stored refrigerant. If the temporary storage is completed, the electronically controlled shut-off valve assembly will close the refrigerant flow channel of the second refrigerant circulation path. In response to the refrigerant release signal, the electronic valve assembly and the electronic shut-off valve assembly are switched to the refrigerant release state, and the compressor is started, so that the refrigerant temporarily stored in the second vaporizer and the pipeline connected to the second evaporator is transferred to the first refrigerant circulation path. Obtain the refrigerant temperature and refrigerant pressure, and determine the degree of refrigerant superheat to be released based on the refrigerant temperature and refrigerant pressure; Determine whether the temporarily stored refrigerant has been completely released based on the superheat of the released refrigerant; Once the release is complete, the electronic valve assembly and the electrically controlled shut-off valve will return to normal cooling status.

15. The control method according to claim 14, characterized in that, Switching the electronic valve assembly and the electrically controlled shut-off valve assembly to a refrigerant storage state includes: Control the first electrically controlled shut-off valve to close, control the second electrically controlled shut-off valve to open, control the first electronic valve to close, and control the second electronic valve to open.

16. The control method according to claim 14, characterized in that, After the electronic valve assembly and the electrically controlled shut-off valve assembly are switched to the refrigerant temporary storage state, the following are also included: The third fan is activated to dissipate heat from the second evaporator; Control the first and second fans to stop running.

17. The control method according to claim 14, characterized in that, Determining whether the temporary storage of refrigerant has been completed based on the superheat of the temporarily stored refrigerant includes: Compare the temporary refrigerant superheat with the preset temporary storage threshold; If the superheat of the temporarily stored refrigerant is greater than the preset temporary storage threshold, then the temporary storage of the refrigerant is considered complete.

18. The control method according to claim 14, characterized in that, Switching the electronic valve assembly and the electrically controlled shut-off valve assembly to the refrigerant release state includes: The first and second electrically controlled shut-off valves are closed, and the first and second electronic valves are opened, so that the refrigerant in the second evaporator and the pipeline connected to the second evaporator enters the first refrigerant circulation path.

19. The control method according to claim 14, characterized in that, After the electronic valve assembly and the electrically controlled shut-off valve assembly switch to the refrigerant release state, the system also includes: The first, second, and third fans are started to exchange heat with the condenser, the first evaporator, and the second evaporator, respectively.

20. The control method according to claim 14, characterized in that, Determining whether the temporarily stored refrigerant has been completely released based on the superheat of the released refrigerant includes: Compare the released refrigerant superheat with a preset release threshold; If the superheat of the released refrigerant exceeds the preset release threshold, then the temporarily stored refrigerant is determined to have been released.

21. A storage medium, characterized in that, The storage medium stores computer instructions, which, when executed by the computer, are used to perform a control method for a refrigerant temporary storage and release system for automotive air conditioning system maintenance as described in any one of claims 14-20.

22. An electronic device, characterized in that, Includes at least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform a control method for a refrigerant storage and release system for automotive air conditioning system maintenance as described in any one of claims 14-20.

23. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instruction is executed by the processor, it implements a control method for a refrigerant temporary storage and release system for automotive air conditioning system maintenance as described in any one of claims 14-20.

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