Double-air-return air conditioning system, control method of double-air-return air conditioning system and electronic equipment

Abstract

The invention belongs to the field of air conditioners, and discloses a double-air-return air conditioning system, a control method of the double-air-return air conditioning system and electronic equipment, and the double-air-return air conditioning system comprises a double-cylinder compressor, an outdoor heat exchanger, an indoor heat exchanger, a battery heat dissipation heat exchanger, a first expansion valve, a second expansion valve and a control valve; the battery heat dissipation heat exchanger comprises a first channel and a second channel which can exchange heat with each other, and the second channel cools high-temperature cooling liquid of the battery unit into low-temperature cooling liquid. The double-air-return design is achieved, so that when the outdoor heat exchanger and the battery heat dissipation heat exchanger work at the same time, mutual influence caused by different evaporation temperatures of the outdoor heat exchanger and the battery heat dissipation heat exchanger is avoided, and the independent control precision of air conditioner heating and battery heat dissipation is improved. And meanwhile, when the system conducts air conditioner heating, mutual heat exchange is conducted through the first channel and the second channel, cooling of the battery is achieved, air conditioner heating can be conducted through heat of the battery, the energy utilization efficiency of the system is remarkably improved, and the energy consumption of the system is reduced.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning, and in particular to a double-return air conditioning system, a control method for the double-return air conditioning system, and an electronic device. Background Art

[0002] With the rapid development of the new energy vehicle industry, higher requirements are placed on the efficient integrated design of automotive air conditioning systems and battery thermal management systems. These systems are essential to maintaining vehicle performance and passenger comfort. Traditional automotive air conditioning systems mainly rely on components such as compressors, outdoor heat exchangers, indoor heat exchangers, and throttle valves to regulate the temperature inside the vehicle through refrigerant circulation. At the same time, the battery thermal management system uses a heat dissipation heat exchanger to cool the battery to ensure that it operates within the optimal temperature range.

[0003] In the process of realizing the present invention, the inventors found that the prior art has at least the following technical problems: Due to the structural design of the battery heat dissipation heat exchanger and the indoor heat exchanger in parallel, the battery heat dissipation problem is prominent, and the existing system is difficult to effectively dissipate the heat of the battery while heating the room. At the same time, the structural design limits the independent control of air conditioning heating and battery heat dissipation, affecting the control accuracy and overall performance of the system.

[0004] Therefore, how to improve the control accuracy of air-conditioning heating and battery heat dissipation while improving the overall performance of the system is a technical problem to be solved by those skilled in the art. Summary of the invention

[0005] In order to effectively solve the problems of low control accuracy and poor overall performance of air-conditioning systems in the prior art, the present invention provides a dual-return air-conditioning system, a control method for the dual-return air-conditioning system, an electronic device and a computer-readable storage medium.

[0006] A double-return air conditioning system, comprising: a double-cylinder compressor, an outdoor heat exchanger, an indoor heat exchanger, a battery heat dissipation heat exchanger, a first expansion valve, a second expansion valve and a control valve; in: One end of the indoor heat exchanger is connected to the exhaust port of the two-cylinder compressor, and the other end is connected to one end of the outdoor heat exchanger through the first expansion valve, and the other end of the outdoor heat exchanger is connected to the first suction port of the two-cylinder compressor; The battery heat dissipation heat exchanger includes a first channel and a second channel that can exchange heat with each other, one end of the second expansion valve is connected between the indoor heat exchanger and the first expansion valve, and the other end is connected to one end of the first channel, the other end of the first channel is connected to the second air intake port of the two-cylinder compressor, and the second channel is used to be connected in series with the battery unit to cool the high-temperature coolant of the battery unit into a low-temperature coolant; One end of the control valve is connected between the first air intake port and the outdoor heat exchanger, and the other end is connected between the second air intake port and the first channel. When the control valve is opened, the two ends thereof are connected.

[0007] Optionally, the dual return air conditioning system further includes a four-way reversing valve, wherein: The first interface of the four-way reversing valve is connected to the exhaust port, the second interface of the four-way reversing valve is connected to the outdoor heat exchanger, the third interface of the four-way reversing valve is connected to the indoor heat exchanger, and the fourth interface of the four-way reversing valve is connected to the first air intake port; When the four-way reversing valve is in the first state, the first interface is connected to the third interface, and the second interface is connected to the fourth interface; when the four-way reversing valve is in the second state, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0008] Optionally, the dual return air conditioning system further includes: A gas-liquid separator, located between the fourth interface and the first air inlet; an indoor fan, disposed adjacent to the indoor heat exchanger, for achieving forced convection heat exchange between the indoor heat exchanger and indoor air; The outdoor fan is arranged adjacent to the outdoor heat exchanger and is used to realize forced convection heat exchange between the outdoor heat exchanger and outdoor air.

[0009] Optionally, the dual return air conditioning system further includes: A drying filter is located between the outdoor heat exchanger and the first expansion valve.

[0010] Optionally, the dual return air conditioning system further includes a third expansion valve, wherein: One end of the third expansion valve is connected between the drying filter and the first expansion valve, and the other end of the third expansion valve is connected between the first channel and the second expansion valve.

[0011] Optionally, the dual-return air conditioning system further includes a water pump and a battery unit, wherein: One end of the water pump is connected to one end of the second channel, and the other end is used to be connected to the water inlet of the battery unit, and the water outlet of the battery unit is used to be connected to the other end of the second channel.

[0012] Optionally, the dual-return air conditioning system further includes an expansion water tank, wherein: One end of the expansion water tank is used to be connected between the second channel and the water outlet of the battery unit, and the other end is connected between the second channel and the water pump.

[0013] A control method for a dual-return air conditioning system, applied to the dual-return air conditioning system as described in any one of the above, comprising: Obtaining the operating mode and operating parameters of the dual-return air conditioning system; When the operation mode is the indoor heating mode and the battery cooling mode, the four-way reversing valve is controlled to be in the first state, and the battery set temperature is determined according to the operation parameters; Detecting the outlet water temperature of the battery unit, and determining whether the battery set temperature is lower than the outlet water temperature; If yes, it is determined whether the two-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are in the open state; If it is in the open state, the second expansion valve and the water pump are controlled to be in the open state, and the control valve is controlled to be in the closed state; Determining whether the battery set temperature is greater than or equal to the water outlet temperature; If the battery set temperature is lower than the water outlet temperature, the process returns to the step of determining whether the dual-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are in an open state; If the battery set temperature is greater than or equal to the water outlet temperature, the second expansion valve and the water pump are controlled to be in a closed state, and the control valve is controlled to be in an open state; Determining whether the dual-return air conditioning system exits the battery cooling mode according to the operating mode; If the battery heat dissipation mode is not exited, returning to the step of detecting the outlet water temperature of the battery unit and determining whether the battery set temperature is lower than the outlet water temperature; If the battery cooling mode is exited, the battery cooling mode will end.

[0014] Optionally, after determining whether the dual-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are in an open state, the method further includes: When the two-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are not in an open state, controlling the four-way reversing valve to be in a second state; Controlling the water pump, the two-cylinder compressor, the outdoor fan, the control valve, and the third expansion valve to be in an open state; Determining whether the battery set temperature is greater than or equal to the water outlet temperature; If not, return to the step of controlling the water pump, the two-cylinder compressor, the outdoor fan, the control valve, and the third expansion valve to be in an open state; If so, the water pump, the two-cylinder compressor, the outdoor fan, the control valve, and the third expansion valve are controlled to be in a closed state; Determining whether the dual-return air conditioning system exits the battery cooling mode according to the operating mode; If the battery heat dissipation mode is not exited, returning to the step of detecting the outlet water temperature of the battery unit and determining whether the battery set temperature is lower than the outlet water temperature; If the battery cooling mode is exited, the battery cooling mode will end.

[0015] Optionally, when the operation mode is an indoor heating mode and a battery heat dissipation mode, the method further includes: Determining the indoor set temperature according to the operating parameters; Detecting the indoor temperature and determining whether the indoor set temperature is greater than the indoor temperature; If yes, the two-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are controlled to be in an open state; Determining whether the indoor set temperature is less than or equal to the indoor temperature; If the indoor set temperature is less than or equal to the indoor temperature, the two-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are controlled to be in a closed state; When the two-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are in a closed state, judging whether the dual-return air conditioning system exits the indoor heating mode according to the operation mode; If the indoor heating mode is not exited, returning to the step of determining whether the indoor set temperature is greater than the indoor temperature; If the indoor heating mode is exited, the indoor heating mode is ended.

[0016] An electronic device, comprising: A processor and a memory, wherein the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, it realizes the control method of the dual return air conditioning system as described in any one of the above.

[0017] The double-return air conditioning system provided by the embodiment of the present invention has at least the following beneficial effects: The dual-return air conditioning system provided by the present invention realizes a dual-return air design by adopting a dual-cylinder compressor, a dual expansion valve and a control valve, so that when the outdoor heat exchanger and the battery heat dissipation heat exchanger work at the same time, they will not affect each other due to their different evaporation temperatures, thereby improving the independent control accuracy of air conditioning heating and battery heat dissipation. At the same time, when the system is heating with air conditioning, the first channel and the second channel of the battery heat dissipation heat exchanger are used to exchange heat with each other, which not only realizes the cooling of the battery, but also can use the heat of the battery for air conditioning heating, allowing the system to effectively dissipate heat from the battery while maintaining a comfortable temperature in the car, significantly improving the energy utilization efficiency of the system and reducing the energy consumption of the system.

[0018] In summary, the present invention can effectively improve the problems of low control accuracy and low overall performance of the air-conditioning system existing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic structural diagram of a double-return air conditioning system provided by an embodiment of the present invention; Figure 2 A schematic diagram of a dual-return air conditioning system provided by an embodiment of the present invention when it is in an air conditioning heating mode and a battery cooling mode at the same time; Figure 3 A schematic diagram of a dual-return air conditioning system provided by an embodiment of the present invention when it is only in a battery heat dissipation mode; Figure 4 A schematic diagram of a dual-return air conditioning system provided by an embodiment of the present invention when it is only in air conditioning heating mode; Figure 5 A flow chart of a control method for a double-return air conditioning system provided by an embodiment of the present invention; Figure 6 A flow chart of another control method for a double-return air conditioning system provided by an embodiment of the present invention; Figure 7 The present invention provides a flowchart of a control method for a dual-return air conditioning system.

[0021] Description of reference numerals: 1. Compressor, 101. First air intake port, 102. Second air intake port, 103. Exhaust port, 2. Four-way reversing valve, 201. First interface, 202. Second interface, 203. Third interface, 204. Fourth interface, 3. Outdoor fan, 4. Outdoor heat exchanger, 5. Dry filter, 6. First expansion valve, 7. Second expansion valve, 8. Battery cooling heat exchanger, 801. First channel, 802. Second channel, 9. Indoor heat exchanger, 10. Indoor fan, 11. Gas-liquid separator, 12. Control valve, 13. Third expansion valve, 14. Water pump, 15. Battery unit, 16. Expansion water tank. DETAILED DESCRIPTION

[0022] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] It should be clear that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0025] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0026] Please refer to Figure 1 , is a schematic diagram of the structure of a dual-return air conditioning system provided by an embodiment of the present invention. The dual-return air conditioning system can be applied to new energy vehicles, including electric buses, electric logistics vehicles, electric trucks, and electric engineering vehicles. Figure 1 As shown, the double return air conditioning system includes: A two-cylinder compressor 1, an outdoor heat exchanger 4, an indoor heat exchanger 9, a battery heat dissipation heat exchanger 8, a first expansion valve 6, a second expansion valve 7 and a control valve 12; in: One end of the indoor heat exchanger 9 is connected to the exhaust port 103 of the two-cylinder compressor 1, and the other end is connected to one end of the outdoor heat exchanger 4 through the first expansion valve 6, and the other end of the outdoor heat exchanger 4 is connected to the first air intake port 101 of the two-cylinder compressor 1; The battery heat dissipation heat exchanger 8 includes a first channel 801 and a second channel 802 that can exchange heat with each other. One end of the second expansion valve 7 is connected between the indoor heat exchanger 9 and the first expansion valve 6, and the other end is connected to one end of the first channel 801. The other end of the first channel 801 is connected to the second air intake port 102 of the two-cylinder compressor 1. The second channel 802 is used to be connected in series with the battery unit 15 to cool the high-temperature coolant of the battery unit 15 into a low-temperature coolant. The control valve 12 can be a solenoid valve, one end of the control valve 12 is connected between the first air intake port 101 and the outdoor heat exchanger 4, and the other end is connected between the second air intake port 102 and the first channel 801. After the control valve 12 is opened, the two ends are connected. It can be understood that the battery unit 15 can include a battery and a battery heat exchange structure that contacts and exchanges heat with the battery. The battery heat exchange structure can flow coolant, so that the low-temperature coolant flows into the heat exchange structure to absorb the heat from the battery and convert it into high-temperature coolant. The high-temperature coolant flows through the second channel 802 of the battery heat dissipation heat exchanger 8 and exchanges heat with the low-temperature refrigerant in the first channel 801, so that the heat carried by the coolant is transferred to the refrigerant, thereby obtaining a low-temperature coolant, and the low-temperature coolant flows back to the battery heat exchange structure, and the cycle is repeated to continuously meet the heat dissipation requirements of the battery. It should be noted that the battery of the battery unit 15 can be a whole vehicle battery of a new energy vehicle.

[0027] In this embodiment, by setting one end of the indoor heat exchanger 9 to be connected to the exhaust port 103 of the two-cylinder compressor 1, and the other end to be connected to one end of the outdoor heat exchanger 4 through the first expansion valve 6, and the other end of the outdoor heat exchanger 4 is connected to the first intake port 101 of the two-cylinder compressor 1, an indoor heating system is formed to realize a heating cycle.

[0028] The two-cylinder compressor 1 has two cylinders. When the two-cylinder compressor 1 is working, the two cylinders complete the suction through the corresponding first suction port 101 and the second suction port 102 respectively. The two cylinders compress the refrigerant into a high-temperature and high-pressure gas, which converges in front of the exhaust port 103 and is sent to the indoor heat exchanger 9 through the exhaust port 103. Here, the refrigerant exchanges heat with the indoor air through the indoor heat exchanger 9, releases heat, and warms the air in the car. Subsequently, the refrigerant passes through the first expansion valve 6, throttles and reduces pressure, becomes a low-temperature and low-pressure liquid (or a gas-liquid mixture), and flows to the outdoor heat exchanger 4. In the outdoor heat exchanger 4, the refrigerant absorbs the heat of the outside air, evaporates into a gaseous state, and then returns to the first suction port 101 of the two-cylinder compressor 1 through the other end of the outdoor heat exchanger 4.

[0029] In this embodiment, by setting one end of the second expansion valve 7 to be connected between the indoor heat exchanger 9 and the first expansion valve 6, and the other end to be connected to one end of the first channel 801, and the other end of the first channel 801 to be connected to the second air intake port 102 of the two-cylinder compressor 1, a circuit capable of independently controlling the heat dissipation of the battery is constructed. When the battery heat dissipation heat exchanger 8 needs to work, the medium-temperature and high-pressure liquid refrigerant flows out of the indoor heat exchanger 9, passes through the throttling of the second expansion valve 7, and is transformed into a low-temperature and low-pressure gas-liquid two-phase state (gas-liquid mixture). This transformation enables the refrigerant to more effectively absorb the heat generated by the battery when entering the first channel 801. The design of the first channel 801 allows the refrigerant to exchange heat with the high-temperature coolant in the battery unit 15, thereby achieving heat dissipation of the battery.

[0030] During the heat exchange process, the coolant in the battery unit 15 releases heat to the refrigerant, its own temperature decreases, and then circulates back to the battery unit 15 to continue absorbing heat, maintaining the battery within a safe operating temperature range. After the heat exchange, the temperature of the refrigerant increases, absorbs heat and evaporates into a gaseous state, and enters the second air intake port 102 of the dual-cylinder compressor 1 through the other end of the first channel 801, ready for the next cycle.

[0031] In this embodiment, one end of the control valve 12 is connected between the first air intake port 101 and the outdoor heat exchanger 4, and the other end is connected between the second air intake port 102 and the first channel 801. When the control valve 12 is opened, the two ends are connected, and when the control valve 12 is closed, the two ends are not connected.

[0032] When the system is in the air conditioning heating mode and the battery cooling mode at the same time, the control valve 12 is closed to realize the double air return design. This design ensures that the outdoor heat exchanger 4 and the battery cooling heat exchanger 8 will not affect each other due to their different evaporation temperatures when they work at the same time, improves the independent control accuracy of air conditioning heating and battery cooling, and effectively ensures that both indoor temperature and battery temperature can be effectively adjusted.

[0033] The specific operation is as follows: when both the indoor heat exchanger 9 and the battery heat dissipation heat exchanger 8 need to work, that is, when the system is in the air conditioning heating mode and the battery heat dissipation mode at the same time, the control valve 12 is closed, so that after the refrigerant passes through the indoor heat exchanger 9, a part of it flows to the outdoor heat exchanger 4 through the first expansion valve 6, and the other part flows to the battery heat dissipation heat exchanger 8 through the second expansion valve 7. In this way, the two heat exchangers can independently adjust the temperature according to their respective needs without affecting each other. For example, the outdoor heat exchanger 4 may require a lower evaporation temperature to absorb heat from the outside air, while the battery heat dissipation heat exchanger 8 may require a higher evaporation temperature to effectively dissipate heat.

[0034] On the contrary, when the system is only in the air conditioning heating mode or the battery cooling mode, the control valve 12 is opened to allow the refrigerant to flow between the two air intake ports. In this way, when the system is only in the air conditioning heating mode or the battery cooling mode, both cylinders of the two-cylinder compressor 1 can participate in the work to avoid damage to the compressor caused by only one cylinder being in working state, thereby extending the service life of the two-cylinder compressor 1. For example, if only air conditioning heating is required, the refrigerant is allowed to circulate between the outdoor heat exchanger 4 and the indoor heat exchanger 9, while the battery cooling heat exchanger 8 does not participate in the work, and the opening of the control valve 12 allows the refrigerant flowing out of the outdoor heat exchanger 4 to flow back to the two-cylinder compressor 1 through the first air intake port 101, and the other part flows back to the two-cylinder compressor 1 through the control valve 12 and the second air intake port 102 to ensure the normal operation of the two-cylinder compressor 1. Similarly, if only battery heat dissipation is required, the opening of the control valve 12 allows a portion of the refrigerant flowing out of the first channel 801 of the battery heat dissipation heat exchanger 8 to flow back to the two-cylinder compressor 1 through the second air intake port 102, and the other portion to flow back to the two-cylinder compressor 1 through the control valve 12 and the first air intake port 101, so as to ensure the normal operation of the two-cylinder compressor 1.

[0035] Through the intelligent control of the control valve 12, the dual-return air conditioning system can flexibly adapt to different working requirements, which not only ensures the efficiency of air conditioning heating and battery heat dissipation, but also takes into account the balanced operation of the dual-cylinder compressor 1, thereby improving the reliability and durability of the entire system.

[0036] On the basis of the above embodiments, in some embodiments, the dual return air conditioning system further includes a four-way reversing valve 2, wherein: The first interface 201 of the four-way reversing valve 2 is connected to the exhaust port 103, the second interface 202 of the four-way reversing valve 2 is connected to the outdoor heat exchanger 4, the third interface 203 of the four-way reversing valve 2 is connected to the indoor heat exchanger 9, and the fourth interface 204 of the four-way reversing valve 2 is connected to the first air intake port 101 of the compressor; When the four-way reversing valve 2 is in the first state, the first interface 201 is connected to the third interface 203, and the second interface 202 is connected to the fourth interface 204; when the four-way reversing valve 2 is in the second state, the first interface 201 is connected to the second interface 202, and the third interface 203 is connected to the fourth interface 204.

[0037] In this embodiment, the design of the four-way reversing valve 2 includes four interfaces, wherein the first interface 201 is connected to the exhaust port 103 of the two-cylinder compressor 1, and the high-temperature and high-pressure gaseous refrigerant discharged from the two-cylinder compressor 1 can enter the outdoor heat exchanger 4 or the indoor heat exchanger 9 for condensation; the second interface 202 is connected to the outdoor heat exchanger 4, and when the system is only in the battery cooling mode or the air-conditioning cooling mode, the high-temperature and high-pressure gaseous refrigerant discharged from the two-cylinder compressor 1 flows into the outdoor heat exchanger 4 for condensation. In addition, when the system is only in the air-conditioning heating mode, or in the air-conditioning heating mode and the battery cooling mode at the same time, the high-temperature and high-pressure gaseous refrigerant is discharged from the two-cylinder compressor 1 through the indoor heat exchanger 4. The low-temperature and low-pressure gaseous refrigerant of the external heat exchanger 4 returns to the two-cylinder compressor 1; the third interface 203 is connected to the indoor heat exchanger 9. When the system is in the air-conditioning heating mode only, or in the air-conditioning heating mode and the battery cooling mode at the same time, the high-temperature and high-pressure gaseous refrigerant discharged from the two-cylinder compressor 1 flows into the indoor heat exchanger 9 for condensation. In addition, when the system is in the air-conditioning cooling mode only, the low-temperature and low-pressure gaseous refrigerant passing through the indoor heat exchanger 9 returns to the two-cylinder compressor 1; the fourth interface 204 is connected to the first air intake port 101 of the two-cylinder compressor 1, and the low-temperature and low-pressure gaseous refrigerant can smoothly return to the two-cylinder compressor 1 for the next cycle.

[0038] In the first state, the first interface 201 and the third interface 203 of the four-way reversing valve 2 are connected, so that the high-temperature and high-pressure gaseous refrigerant flows to the indoor heat exchanger 9 for condensation, and the second interface 202 and the fourth interface 204 are connected, allowing the refrigerant passing through the outdoor heat exchanger 4 to flow back to the two-cylinder compressor 1. In the second state, the first interface 201 and the second interface 202 of the four-way reversing valve 2 are connected, so that the high-temperature and high-pressure gaseous refrigerant flows to the outdoor heat exchanger 4 for condensation, and the third interface 203 and the fourth interface 204 are connected, allowing the refrigerant passing through the indoor heat exchanger 9 to flow back to the two-cylinder compressor 1.

[0039] Based on the above embodiments, in some embodiments, the dual-return air conditioning system further includes: The gas-liquid separator 11 is located between the fourth interface 204 of the four-way reversing valve 2 and the first air intake port 101 of the compressor; An indoor fan 10 is disposed adjacent to the indoor heat exchanger 9, for example, on the air outlet side or air inlet side of the indoor heat exchanger 9, and is used to realize forced convection heat exchange between the indoor heat exchanger 9 and the indoor air; The outdoor fan 3 is disposed adjacent to the outdoor heat exchanger 4, for example, at the air outlet side or the air inlet side of the outdoor heat exchanger 4, for realizing forced convection heat exchange between the outdoor heat exchanger 4 and the outdoor air.

[0040] In this embodiment, the gas-liquid separator 11 is located between the four-way reversing valve 2 and the first air intake port 101 of the two-cylinder compressor 1. Its main function is to prevent the low-pressure and low-temperature steam returning to the two-cylinder compressor 1 from carrying too many droplets, so as to avoid the liquid refrigerant from entering the cylinder of the two-cylinder compressor 1, thereby effectively preventing liquid hammer. It also has the functions of filtering, oil return, and liquid storage. The indoor fan 10 is arranged adjacent to the indoor heat exchanger 9, and its function is to promote the heat exchange between the indoor air and the indoor heat exchanger 9 and improve the heat exchange efficiency. The outdoor fan 3 is arranged adjacent to the outdoor heat exchanger 4, and its function is to promote the heat exchange between the outdoor air and the outdoor heat exchanger 4 and improve the heat exchange efficiency.

[0041] Based on the above embodiments, in some embodiments, the dual-return air conditioning system further includes: The filter drier 5 is located between the outdoor heat exchanger 4 and the first expansion valve 6 .

[0042] In this embodiment, the filter drier 5 performs drying and filtering on the refrigerant output from the first expansion valve 6 or the outdoor heat exchanger 4. The filter drier 5 can absorb moisture in the refrigerant, effectively preventing ice blockage and dirt blockage of the system pipeline, so as to ensure the normal operation of the refrigeration system. By arranging the filter drier 5 between the outdoor heat exchanger 4 and the first expansion valve 6, it can be effectively ensured that the refrigerant reaches the required dryness and cleanliness before entering the next link of the system, thereby improving the operating efficiency and reliability of the entire air-conditioning system.

[0043] On the basis of the above embodiments, in some embodiments, the dual return air conditioning system further includes a third expansion valve 13, wherein: One end of the third expansion valve 13 is connected to the drying filter 5 and the first expansion valve 6 , that is, one end of the third expansion valve 13 is connected between the first expansion valve 6 and the drying filter 5 , and the other end is connected between the first channel 801 and the second expansion valve 7 .

[0044] In this embodiment, the function of the third expansion valve 13 is to throttle, cool and reduce the pressure of the refrigerant output by the outdoor heat exchanger 4, and then input the treated refrigerant into the first channel 801 of the battery heat dissipation heat exchanger 8. This process is the key link when the system is only in the battery heat dissipation mode. Through the throttling effect of the third expansion valve 13, the refrigerant is converted into a low-temperature and low-pressure state before entering the first channel 801, and then heat is exchanged with the coolant in the second channel 802 inside the first channel 801, and evaporates into a low-temperature and low-pressure gaseous refrigerant after absorbing heat. Finally, these gaseous refrigerants enter the second air intake port 102, and enter the first air intake port 101 through the control valve 12, and finally enter the two-cylinder compressor 1 for the next cycle, thereby realizing heat dissipation of the battery when the system is only in the battery heat dissipation mode.

[0045] Based on the above embodiments, in some embodiments, the dual-return air conditioning system further includes a water pump 14, wherein: One end of the water pump 14 is connected to one end of the second channel 802, and the other end is connected to the water inlet of the battery unit 15, and the water outlet of the battery unit 15 is connected to the other end of the second channel 802. It can be understood that the second channel 802 of the battery heat dissipation heat exchanger 8, the water pump 14, and the battery unit 15 can be connected in series in sequence through pipelines to form a battery coolant circulation loop.

[0046] In this embodiment, the dual-return air conditioning system further integrates a water pump 14 to enhance the heat dissipation function of the battery. A coolant circulation path is established through the water pump 14, the battery unit 15 and the second channel 802, and the water pump 14 is responsible for promoting the battery coolant to circulate between the second channel 802 and the battery unit 15. When the battery generates heat, the coolant in the battery unit 15 absorbs the heat of the battery, the temperature rises, and then flows into the second channel 802 of the battery heat dissipation heat exchanger 8. The high-temperature coolant in the second channel 802 releases heat and the temperature decreases by heat exchange with the refrigerant in the first channel 801. The cooled coolant is then circulated back to the battery unit 15 through the water pump 14 to continue to absorb heat and achieve effective heat dissipation of the battery.

[0047] Through this integrated design, the dual-return air conditioning system of this embodiment can not only independently control indoor heating and battery heat dissipation, but also recover the heat generated by the battery while heating, thereby improving energy utilization efficiency and enhancing the energy efficiency and comfort of the system.

[0048] Based on the above embodiments, in some embodiments, the dual return air conditioning system further includes an expansion water tank 16, wherein: One end of the expansion water tank 16 is connected between the second channel 802 and the water outlet of the battery unit 15 , and the other end is connected between the second channel 802 and the water pump 14 .

[0049] In this embodiment, the dual-return air conditioning system further integrates an expansion water tank 16, which can play a role in buffering and stabilizing the pressure in the coolant circulation system. When the coolant in the battery cell 15 changes in volume due to temperature changes during the circulation process, the expansion water tank 16 provides the necessary space to accommodate these changes. When the coolant expands due to heat, the excess liquid will be guided to the expansion water tank 16, and when the coolant cools and contracts, the liquid in the expansion water tank 16 can flow back to the second channel 802, effectively ensuring the continuity and stability of the coolant circulation.

[0050] In addition, the expansion tank 16 also helps to separate and remove gas in the system. During the circulation of the coolant, gas may be dissolved in the liquid, and these gases can be released and collected in the expansion tank 16, thereby reducing cavitation in the system and improving heat exchange efficiency.

[0051] Through this design, the dual-return air conditioning system of this embodiment can not only independently control indoor heating and battery heat dissipation, but also effectively manage the circulation and pressure of the coolant, thereby improving the reliability and stability of the system. The addition of the expansion tank 16 provides a more complete and efficient solution for the thermal management system of new energy vehicles, effectively ensuring that the battery can be properly cooled under various working conditions, thereby extending the service life of the battery and improving the performance of the entire vehicle.

[0052] Please refer to Figure 2 , is a schematic diagram of a dual-return air conditioning system provided by an embodiment of the present invention when it is in both the air conditioning heating mode and the battery cooling mode. Figure 2 As shown: When the dual-return air conditioning system is in both the air conditioning heating mode and the battery cooling mode, the low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam by the compressor, flows through the four-way reversing valve 2 and enters the indoor heat exchanger 9, releases heat through forced convection heat exchange by the indoor fan 10, and condenses into medium-temperature and high-pressure liquid refrigerant, which is then divided into two paths: One path flows through the first expansion valve 6 and is throttled into a low-temperature and low-pressure gas-liquid two-phase refrigerant, flows through the drying filter 5 and enters the outdoor heat exchanger 4, absorbs the heat of the outdoor air and evaporates into a low-temperature and low-pressure gaseous refrigerant, and then flows through the four-way reversing valve 2 and enters the gas-liquid separator 11. At this time, the control valve 12 is in a closed state and the two ends are not connected, so the refrigerant enters the two-cylinder compressor 1 from the first air intake port 101 for compression; The medium-temperature and high-pressure liquid refrigerant on the other side flows through the second expansion valve 7 and is throttled into a low-temperature and low-pressure gas-liquid two-phase refrigerant. Because the third expansion valve 13 is not opened at this time, the gas-liquid two-phase refrigerant only enters the first channel 801 of the battery heat dissipation heat exchanger 8, absorbs the heat of the coolant and evaporates into a low-temperature and low-pressure gaseous refrigerant, and then enters the two-cylinder compressor 1 through the second air intake port 102 for compression.

[0053] The coolant of the battery is powered by the water pump 14. The coolant in the battery unit 15 absorbs the heat of the battery and then flows through the second channel 802 of the battery heat dissipation heat exchanger 8 to release the heat. After the temperature drops, it returns to the battery unit 15 to absorb the heat. This cycle repeats to achieve the heat dissipation function of the battery. When the coolant expands due to heat, the excess liquid will be guided to the expansion water tank 16. When the coolant contracts due to cooling, the liquid in the expansion water tank 16 can flow back to the second channel 802, effectively ensuring the continuity and stability of the coolant circulation.

[0054] Please refer to Figure 3 , is a schematic diagram of a dual-return air conditioning system provided by an embodiment of the present invention when it is only in the battery cooling mode. Figure 3 As shown: When the dual-return air conditioning system is only in the battery heat dissipation mode, the low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam by the compressor, flows through the four-way reversing valve 2 and enters the outdoor heat exchanger 4, releases heat to the outside through forced convection heat exchange by the outdoor fan 3, and condenses into medium-temperature and high-pressure liquid refrigerant. At this time, the first expansion valve 6 and the second expansion valve 7 are in a closed state, so the medium-temperature and high-pressure liquid refrigerant flows through the drying filter 5 and enters the third expansion valve 13 to be throttled into a low-temperature and low-pressure gas-liquid two-phase refrigerant, and enters the first channel 801 of the battery heat dissipation heat exchanger 8, absorbs the heat of the coolant in the second channel 802 and evaporates into a low-temperature and low-pressure gaseous refrigerant. At this time, the control valve 12 is in an open state and both ends are connected, so the low-temperature and low-pressure gaseous refrigerant in the first channel 801 enters the two-cylinder compressor 1 from the first air intake port 101 and the second air intake port 102 respectively for compression.

[0055] The battery heat dissipation process when the dual-return air-conditioning system is only in the battery heat dissipation mode can refer to the battery heat dissipation process when the dual-return air-conditioning system is in both the air-conditioning heating mode and the battery heat dissipation mode, which will not be repeated here.

[0056] Please refer to Figure 4 , is a schematic diagram of a dual-return air conditioning system provided by an embodiment of the present invention when it is only in the air conditioning heating mode. Figure 4 As shown: When the double return air conditioning system is only in the air conditioning heating mode, the low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam by the compressor, flows through the four-way reversing valve 2 and enters the indoor heat exchanger 9, releases heat through forced convection heat exchange by the indoor fan 10, and condenses into medium-temperature and high-pressure liquid refrigerant. At this time, the second expansion valve 7 and the third expansion valve 13 are in a closed state, so the medium-temperature and high-pressure liquid refrigerant flows through the first expansion valve 6 and is throttled into a low-temperature and low-pressure gas-liquid two-phase refrigerant, flows through the drying filter 5 and enters the outdoor heat exchanger 4, absorbs the heat of the outdoor air and evaporates into a low-temperature and low-pressure gaseous refrigerant, and then flows through the four-way reversing valve 2 and enters the gas-liquid separator 11. At this time, the control valve 12 is in an open state and both ends are connected, so the refrigerant enters the two-cylinder compressor 1 from the first air intake port 101 and the second air intake port 102 for compression.

[0057] At this time, the battery cooling system does not work and the water pump 14 is in a closed state.

[0058] Based on the above technical solution, the dual-return air conditioning system provided by the present invention realizes a dual-return air design by adopting a dual-cylinder compressor 1, a dual expansion valve and a control valve 12, so that when the outdoor heat exchanger 4 and the battery heat dissipation heat exchanger 8 work at the same time, they will not affect each other due to their different evaporation temperatures, thereby improving the independent control accuracy of air conditioning heating and battery heat dissipation. At the same time, when the system is heating with air conditioning, the first channel 801 and the second channel 802 of the battery heat dissipation heat exchanger 8 exchange heat with each other, which not only realizes the cooling of the battery, but also uses the heat of the battery for air conditioning heating, allowing the system to effectively dissipate heat from the battery while maintaining a comfortable temperature in the car, significantly improving the energy utilization efficiency of the system and reducing the energy consumption of the system.

[0059] It is understandable that the dual return air conditioning system also includes a controller, a pressure sensor, and a temperature sensor to better control the operation of the air conditioner. Regarding the settings of the controller, the pressure sensor, and the temperature sensor, reference can be made to the existing air conditioning technology, and no further description will be given here.

[0060] Please refer to Figure 5 , is a flow chart of a control method for a double-return air conditioning system provided by an embodiment of the present invention, comprising the following steps: Step S01, obtaining the operation mode and operation parameters of the dual-return air conditioning system.

[0061] In this embodiment, the dual-return air conditioning system can monitor the operating mode and operating parameters of the system in real time by integrating the detection module. For example, the operating mode may include the air conditioning heating mode and the battery cooling mode, and the operating parameters may include the indoor set temperature, the indoor temperature, the battery set temperature, and the water outlet temperature of the battery unit 15.

[0062] Step S02, when the operation mode is the indoor heating mode and the battery cooling mode, the four-way reversing valve 2 is controlled to be in the first state, and the battery set temperature is determined according to the operation parameters.

[0063] In this embodiment, when the operation mode of the dual-return air conditioning system is set to the indoor heating mode and the battery cooling mode, the system will automatically control the four-way reversing valve 2 to be in the first state, so that the first interface 201 and the third interface 203 are connected, and the second interface 202 and the fourth interface 204 are connected. Such control enables the refrigerant to flow according to the needs of the refrigeration cycle when the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 are in the open state: the high-temperature and high-pressure gaseous refrigerant discharged by the two-cylinder compressor 1 flows into the indoor heat exchanger 9 through the first interface 201 and the third interface 203, releases heat in the indoor heat exchanger 9 and condenses into liquid refrigerant; at the same time, the low-temperature and low-pressure liquid refrigerant throttled by the first expansion valve 6 absorbs heat and evaporates in the outdoor heat exchanger 4, and flows into the first air intake port 101 of the two-cylinder compressor 1 through the second interface 202 and the fourth interface 204.

[0064] Step S03, detecting the outlet water temperature of the battery unit 15, and determining whether the battery set temperature is lower than the outlet water temperature.

[0065] If yes, execute step S04; if no, execute step S08.

[0066] In this embodiment, by comparing the battery set temperature with the actual water outlet temperature, the system can determine whether the current battery heat dissipation is sufficient. If the water outlet temperature is higher than the battery set temperature, it means that the battery still needs to dissipate heat to maintain the battery within a safe and efficient operating temperature range. Therefore, if the battery set temperature is lower than the water outlet temperature (i.e., the water outlet temperature is higher), the system will execute step S04 to further check (or determine) the status of the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6.

[0067] On the contrary, if the outlet water temperature is not higher than the battery set temperature, it indicates that the battery heat dissipation demand is low or has been met. In this case, the system will execute step S08 to evaluate whether it is necessary to end the battery heat dissipation mode.

[0068] This embodiment allows the system to dynamically adjust its operating state based on the actual heat dissipation needs of the battery. By precisely controlling the opening and closing of the heat dissipation components, the system can effectively manage the battery temperature while optimizing energy use and device life. This approach improves the intelligence level of the thermal management system of new energy vehicles and effectively ensures that the battery can be properly cooled under various operating conditions, thereby improving the performance and reliability of the entire vehicle.

[0069] Step S04, determining whether the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 are in an open state.

[0070] If yes, execute step S05.

[0071] In this embodiment, the system performs a series of key component status checks, the purpose of which is to confirm whether the heating components in the system are working and continuously providing heat to the vehicle based on the status of these components. If these components are all turned on, step S05 is executed.

[0072] It is understandable that in order to avoid damage to the twin-cylinder compressor 1 due to single-cylinder operation, the control valve 12 can be set to be open by default. During the operation of the dual-return air-conditioning system, it is determined whether the control valve 12 needs to be closed, and when necessary, the control valve 12 is closed to improve the independent control accuracy of air-conditioning heating and battery heat dissipation.

[0073] Step S05, controlling the second expansion valve 7 and the water pump 14 to be in an open state, and controlling the control valve 12 to be in a closed state.

[0074] In this embodiment, when the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 are in the open state, it proves that the heating components in the system are working and continue to provide heat for the vehicle. At this time, the system controls the second expansion valve 7 and the water pump 14 to be in the open state, and controls the control valve 12 to be in the closed state. The purpose is to ensure that the battery heat dissipation circuit can operate independently of the indoor heating circuit. The opening of the second expansion valve 7 allows the low-temperature and low-pressure refrigerant to flow into the battery heat dissipation heat exchanger 8, and the opening of the water pump 14 promotes the circulation of the coolant between the battery heat dissipation heat exchanger 8 and the battery unit 15, effectively absorbing and dissipating the heat generated by the battery. At the same time, the closing of the control valve 12 ensures that the outdoor heat exchanger 4 and the battery heat dissipation heat exchanger 8 will not affect each other due to their different evaporation temperatures when they work at the same time, thereby improving the independent control accuracy of air conditioning heating and battery heat dissipation, and effectively ensuring that both the indoor temperature and the battery temperature can be effectively adjusted.

[0075] Step S06, determining whether the battery setting temperature is greater than or equal to the water outlet temperature.

[0076] If yes, execute step S07; if no, return to execute step S04 to determine whether the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 are in the open state.

[0077] In this embodiment, the system compares the battery setting temperature with the outlet water temperature of the battery unit 15. If the battery setting temperature is lower than the outlet water temperature, this indicates that the heat dissipation needs to be continued. In this case, the system returns to step S04 to recheck and ensure that the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12 and the first expansion valve 6 are in the open state to maintain indoor heating and continue the battery heat dissipation.

[0078] On the contrary, if the battery set temperature is greater than or equal to the water outlet temperature, it means that the battery has reached or is lower than the preset safe operating temperature and no additional heat dissipation measures are required. Therefore, the system will execute step S07, close the second expansion valve 7 and the water pump 14, and open the control valve 12 to stop the operation of the battery heat dissipation circuit and maintain the indoor heating mode.

[0079] Step S07, controlling the second expansion valve 7 and the water pump 14 to be in a closed state, and controlling the control valve 12 to be in an open state.

[0080] In this embodiment, after the battery temperature is controlled, the second expansion valve 7 and the water pump 14 are controlled to be in a closed state, and the control valve 12 is controlled to be in an open state to optimize the energy distribution of the system and the service life of the components. Closing the second expansion valve 7 and the water pump 14 can reduce energy consumption. This control logic helps to improve the energy efficiency of the system, ensuring that the battery temperature can be effectively managed while meeting the indoor heating demand, thereby improving the overall performance and reliability of new energy vehicles.

[0081] Step S08, judging whether the dual-return air conditioning system has exited the battery cooling mode according to the operation mode.

[0082] If yes, execute step S09; if no, return to execute step S03, detect the outlet water temperature of the battery unit 15, and determine whether the battery set temperature is lower than the outlet water temperature.

[0083] Step S09, ending the battery heat dissipation mode.

[0084] Based on the above technical solution, this embodiment realizes precise control of indoor heating and battery heat dissipation. In the indoor heating and battery heat dissipation mode, the system dynamically adjusts the working state of the second expansion valve 7 and the water pump 14 through precise control of the four-way reversing valve 2 and real-time monitoring of the outlet water temperature of the battery unit 15, effectively ensuring the heat dissipation efficiency of the battery. When the battery temperature is higher than the set value, the system will start the second expansion valve 7 and the water pump 14 to increase the heat dissipation capacity; when the battery temperature drops to the set value or below, the second expansion valve 7 and the water pump 14 are closed, and the control valve 12 is opened at the same time to optimize energy use and protect the two-cylinder compressor 1. This method not only improves the energy efficiency and comfort of the air-conditioning system, but also reduces unnecessary wear on the compressor through precise control, extending its service life.

[0085] Please refer to Figure 6 , which is a flow chart of another control method of a dual-return air conditioning system provided by an embodiment of the present invention. Based on the above embodiment, in some embodiments, after determining whether the dual-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 are in the open state, the following can also be performed: Figure 6Steps shown: Step S11, when the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 are not in the open state, the four-way reversing valve 2 is controlled to be in the second state.

[0086] In this embodiment, when the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 are not in the open state, it is proved that the heating component in the system is not working and does not provide heat for the vehicle. At this time, the system controls the four-way reversing valve 2 to be in the second state, achieving conduction between the first interface 201 and the second interface 202, and conduction between the third interface 203 and the fourth interface 204.

[0087] This control method ensures that when the water pump 14, the two-cylinder compressor 1, the outdoor fan 3, the control valve 12, and the third expansion valve 13 are in the open state, the flow direction of the refrigerant adapts to the heat dissipation requirements of the battery: the high-temperature and high-pressure gas discharged by the two-cylinder compressor 1 flows into the outdoor heat exchanger 4 through the first interface 201 and the second interface 202, and releases heat and condenses in the outdoor heat exchanger 4.

[0088] Step S12, controlling the water pump 14, the two-cylinder compressor 1, the outdoor fan 3, the control valve 12, and the third expansion valve 13 to be in an open state.

[0089] In this embodiment, in order to ensure that the system can fully dissipate battery heat while maintaining or switching to the desired air-conditioning operating mode, the system can effectively circulate the coolant, promote the flow of refrigerant, and regulate the heat exchange process by turning on these components, thereby achieving precise temperature control of the battery.

[0090] Step S13, determining whether the battery set temperature is greater than or equal to the water outlet temperature.

[0091] If yes, execute step S14; if no, return to execute step S12, control the water pump 14, the two-cylinder compressor 1, the outdoor fan 3, the control valve 12, and the third expansion valve 13 to be in the open state.

[0092] In this embodiment, the system detects the outlet water temperature of the battery unit 15 to determine whether the battery has reached or is lower than the preset safe operating temperature. If the battery set temperature is greater than or equal to the outlet water temperature, it indicates that the battery heat dissipation is sufficient, and the system will execute step S14 to shut down the relevant components to stop the heat dissipation process, thereby avoiding excessive heat dissipation, saving energy and protecting system components.

[0093] On the contrary, if the battery set temperature is lower than the water outlet temperature, it means that the battery still needs more heat dissipation. In this case, the system will return to step S12 and continue to keep the water pump 14, the two-cylinder compressor 1, the outdoor fan 3, the control valve 12 and the third expansion valve 13 open to continue the heat dissipation process. This feedback loop ensures that the battery temperature can be effectively controlled and effectively prevents the battery from overheating, thereby extending the battery life and improving the safety and reliability of the vehicle.

[0094] Step S14, controlling the water pump 14, the two-cylinder compressor 1, the outdoor fan 3, the control valve 12, and the third expansion valve 13 to be in a closed state.

[0095] Step S15, judging whether the dual-return air conditioning system has exited the battery cooling mode according to the operation mode.

[0096] If yes, execute step S16; if the battery cooling mode is not exited, return to execute step S03, detect the outlet water temperature of the battery unit 15, and determine whether the battery set temperature is lower than the outlet water temperature.

[0097] Step S16, ending the battery heat dissipation mode.

[0098] Based on the above technical solution, this embodiment provides a dynamic and responsive thermal management method, which not only improves energy utilization efficiency, but also helps protect the battery from overheating damage, thereby extending the battery life and improving the reliability of the vehicle. In addition, by precisely controlling the opening and closing of each component, the system can avoid unnecessary energy waste.

[0099] Please refer to Figure 7 , which is a flow chart of another control method of a dual-return air conditioning system provided by an embodiment of the present invention. Based on the above embodiments, in some embodiments, when the operation mode is the indoor heating mode and the battery cooling mode, the following can also be performed: Figure 7 Steps shown: Step S21, determining the indoor set temperature according to the operating parameters.

[0100] Step S22, detecting the indoor temperature, and determining whether the indoor set temperature is greater than the indoor temperature.

[0101] If yes, execute step S23; if no, execute step S26.

[0102] In this embodiment, the indoor temperature is monitored in real time and compared with the indoor temperature set by the user, the purpose is to ensure the comfort of the indoor environment and optimize energy use. If the detected indoor temperature is lower than the indoor set temperature, it means that more heat is needed to increase the indoor temperature to meet the user's comfort requirements. In this case, the system will execute step S23 to turn on the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12 and the first expansion valve 6 to start or maintain the indoor heating process. It can be understood that the control valve 12 is turned on here based on the fact that the double-return air conditioning system may be in the indoor heating single-on or battery cooling single-on situation. For example, the double-return air conditioning system is in the indoor heating single-on situation. The user changes the demand and needs to switch from indoor heating single-on to indoor heating and battery cooling at the same time. In order to avoid damage to the two-cylinder compressor 1, the control valve 12 is opened first, and it is determined whether to close the control valve 12 during operation. That is, during the operation of the indoor heating mode and the battery cooling mode, the control valve 12 will be closed, so that the indoor heating and battery cooling can be independently controlled to improve the control accuracy.

[0103] On the contrary, if the indoor temperature has reached or exceeded the indoor set temperature, this indicates that the indoor temperature is warm enough, or may be overheated. In this case, the system will execute step S26.

[0104] This embodiment provides an automated temperature adjustment mechanism that can intelligently adjust the operating state of the air conditioning system based on the comparison between the actual indoor temperature and the user-set temperature. This not only improves energy efficiency and reduces energy waste, but also ensures the comfort of the indoor environment and improves passenger satisfaction. In this way, the dual-return air conditioning system can control the indoor temperature more accurately while taking into account the needs of energy saving and environmental protection.

[0105] Step S23, controlling the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 to be in an open state.

[0106] Step S24, determining whether the indoor set temperature is less than or equal to the indoor temperature.

[0107] If yes, execute step S25; if no, return to execute step S23 to control the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 to be in the open state.

[0108] In this embodiment, when the indoor set temperature is less than or equal to the indoor temperature, it indicates that the indoor heating demand has been met and the system no longer needs additional heating. In this case, the system will execute step S25 to turn off the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12 and the first expansion valve 6 to stop the heating process, save energy and prevent indoor overheating.

[0109] If the indoor set temperature is greater than the indoor temperature, the system will return to step S23, continue to keep the heating component turned on, and continue heating to increase the indoor temperature until the comfort level set by the user is reached.

[0110] Step S25, controlling the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 to be in a closed state.

[0111] Step S26, when the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 are in the closed state, it is determined whether the dual-return air conditioning system exits the indoor heating mode according to the operation mode.

[0112] If not, the process returns to step S22 to detect the indoor temperature and determine whether the indoor set temperature is greater than the indoor temperature; If yes, execute step S27.

[0113] In this embodiment, the system checks whether the two-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12 and the first expansion valve 6 are all in the closed state. If these components are already closed, the system will decide whether to end the indoor heating mode according to the current operation mode.

[0114] If the current operation mode is indoor heating mode, the system will return to step S22 to continue monitoring the indoor temperature and compare it with the indoor set temperature to determine whether to restart the heating component. This cycle ensures that the indoor temperature can be continuously monitored and automatically adjusted when necessary to maintain the user's comfort.

[0115] If the current operation mode is no longer the indoor heating mode, step S27 is executed to formally end the indoor heating mode. The reason may be that the user has manually turned off the heating demand. Ending the heating mode can save energy, avoid unnecessary energy consumption, and ensure that the system does not continue to run the heating component when it is not needed.

[0116] Step S27, ending the indoor heating mode.

[0117] Based on the above technical solution, this embodiment allows the system to dynamically adjust the heating output according to the actual indoor temperature demand, thereby improving energy efficiency and passenger comfort. By accurately controlling the opening and closing of the heating components, the system can avoid unnecessary energy waste while ensuring that the indoor temperature remains within the comfortable range set by the user.

[0118] It is understandable that when the operation mode is the indoor heating mode, that is, when the indoor heating mode is operated alone, steps S21 to S27 can also be executed.

[0119] This embodiment provides an electronic device, including a processor and a memory, the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, it implements the control method of the above-mentioned dual return air air conditioning system. Its execution method and beneficial effects are similar and will not be repeated here.

[0120] An embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the control method of the above-mentioned dual return air air conditioning system is implemented. Its execution method and beneficial effects are similar and will not be repeated here.

[0121] It should be noted that although the above describes the various steps in a specific order, it does not mean that the various steps must be executed in the above specific order. In fact, some of these steps can be executed concurrently or even in a different order as long as the required functions can be achieved.

[0122] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double return air conditioning system, characterized in that: include: Two-cylinder compressor, outdoor heat exchanger, indoor heat exchanger, battery heat dissipation heat exchanger, first expansion valve, second expansion valve and control valve; in: One end of the indoor heat exchanger is connected to the exhaust port of the two-cylinder compressor, and the other end is connected to one end of the outdoor heat exchanger through the first expansion valve, and the other end of the outdoor heat exchanger is connected to the first suction port of the two-cylinder compressor; The battery heat dissipation heat exchanger includes a first channel and a second channel that can exchange heat with each other, one end of the second expansion valve is connected between the indoor heat exchanger and the first expansion valve, and the other end is connected to one end of the first channel, the other end of the first channel is connected to the second air intake port of the two-cylinder compressor, and the second channel is used to be connected in series with the battery unit to cool the high-temperature coolant of the battery unit into a low-temperature coolant; One end of the control valve is connected between the first air intake port and the outdoor heat exchanger, and the other end is connected between the second air intake port and the first channel. When the control valve is opened, the two ends thereof are connected.

2. The double return air conditioning system according to claim 1, characterized in that: The dual return air conditioning system also includes a four-way reversing valve, wherein: The first interface of the four-way reversing valve is connected to the exhaust port, the second interface of the four-way reversing valve is connected to the outdoor heat exchanger, the third interface of the four-way reversing valve is connected to the indoor heat exchanger, and the fourth interface of the four-way reversing valve is connected to the first air intake port; When the four-way reversing valve is in the first state, the first interface is connected to the third interface, and the second interface is connected to the fourth interface; when the four-way reversing valve is in the second state, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

3. The double return air conditioning system according to claim 2, characterized in that: The double return air conditioning system also includes: A gas-liquid separator, located between the fourth interface and the first air inlet; an indoor fan, disposed adjacent to the indoor heat exchanger, for achieving forced convection heat exchange between the indoor heat exchanger and indoor air; The outdoor fan is arranged adjacent to the outdoor heat exchanger and is used to realize forced convection heat exchange between the outdoor heat exchanger and outdoor air.

4. The double return air conditioning system according to claim 1, characterized in that: The double return air conditioning system also includes: A drying filter is located between the outdoor heat exchanger and the first expansion valve.

5. The double return air conditioning system according to claim 4, characterized in that: The dual return air conditioning system further comprises a third expansion valve, wherein: One end of the third expansion valve is connected between the drying filter and the first expansion valve, and the other end of the third expansion valve is connected between the first channel and the second expansion valve.

6. The double return air conditioning system according to claim 1, characterized in that: The dual-return air conditioning system also includes a water pump, wherein: One end of the water pump is connected to one end of the second channel, and the other end is used to be connected to the water inlet of the battery unit, and the water outlet of the battery unit is used to be connected to the other end of the second channel.

7. The double return air conditioning system according to claim 6, characterized in that: The dual-return air conditioning system also includes an expansion water tank, wherein: One end of the expansion water tank is used to be connected between the second channel and the water outlet of the battery unit, and the other end is connected between the second channel and the water pump.

8. A control method for a double-return air conditioning system, applied to the double-return air conditioning system according to any one of claims 1 to 7, characterized in that: include: Obtaining the operating mode and operating parameters of the dual-return air conditioning system; When the operation mode is the indoor heating mode and the battery cooling mode, the four-way reversing valve is controlled to be in the first state, and the battery set temperature is determined according to the operation parameters; Detecting the outlet water temperature of the battery unit, and determining whether the battery set temperature is lower than the outlet water temperature; If yes, it is determined whether the two-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are in the open state; If it is in the open state, the second expansion valve and the water pump are controlled to be in the open state, and the control valve is controlled to be in the closed state; Determining whether the battery set temperature is greater than or equal to the water outlet temperature; If the battery set temperature is lower than the water outlet temperature, the process returns to the step of determining whether the dual-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are in an open state; If the battery set temperature is greater than or equal to the water outlet temperature, the second expansion valve and the water pump are controlled to be in a closed state, and the control valve is controlled to be in an open state; Determining whether the dual-return air conditioning system exits the battery cooling mode according to the operating mode; If the battery heat dissipation mode is not exited, returning to the step of detecting the outlet water temperature of the battery unit and determining whether the battery set temperature is lower than the outlet water temperature; If the battery cooling mode is exited, the battery cooling mode will end.

9. The control method according to claim 8, characterized in that: After determining whether the dual-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are in an open state, the method further includes: When the two-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are not in an open state, controlling the four-way reversing valve to be in a second state; Controlling the water pump, the two-cylinder compressor, the outdoor fan, the control valve, and the third expansion valve to be in an open state; Determining whether the battery set temperature is greater than or equal to the water outlet temperature; If not, return to the step of controlling the water pump, the two-cylinder compressor, the outdoor fan, the control valve, and the third expansion valve to be in an open state; If so, the water pump, the two-cylinder compressor, the outdoor fan, the control valve, and the third expansion valve are controlled to be in a closed state; Determining whether the dual-return air conditioning system exits the battery cooling mode according to the operating mode; If the battery heat dissipation mode is not exited, returning to the step of detecting the outlet water temperature of the battery unit and determining whether the battery set temperature is lower than the outlet water temperature; If the battery cooling mode is exited, the battery cooling mode will end.

10. The method according to claim 8, characterized in that When the operation mode is an indoor heating mode and a battery cooling mode, the method further includes: Determining the indoor set temperature according to the operating parameters; Detecting the indoor temperature and determining whether the indoor set temperature is greater than the indoor temperature; If yes, the two-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are controlled to be in an open state; Determining whether the indoor set temperature is less than or equal to the indoor temperature; If the indoor set temperature is less than or equal to the indoor temperature, the two-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are controlled to be in a closed state; When the two-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are in a closed state, judging whether the dual-return air conditioning system exits the indoor heating mode according to the operation mode; If the indoor heating mode is not exited, returning to the step of determining whether the indoor set temperature is greater than the indoor temperature; If the indoor heating mode is exited, the indoor heating mode is ended.

11. An electronic device, characterized in that: include: A processor and a memory, wherein the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, it realizes the control method of the dual return air conditioning system as described in any one of claims 8-10.

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