Dual-loop air conditioning system, control method of dual-loop air conditioning system, and electronic device

Abstract

The application belongs to the field of air conditioners, and discloses a double-return-air air conditioner system, a control method of the double-return-air air conditioner system and electronic equipment, the double-return-air air conditioner 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; the battery heat dissipation heat exchanger comprises a first channel and a second channel capable of heat exchange with each other, and the second channel cools high-temperature cooling liquid of a battery unit into low-temperature cooling liquid. The application realizes double-return-air design, so that the outdoor heat exchanger and the battery heat dissipation heat exchanger do not affect each other when working at the same time due to different evaporation temperatures, and the independent control precision of air conditioner heating and battery heat dissipation is improved. Meanwhile, the system exchanges heat through the first channel and the second channel when air conditioner heating, which not only realizes cooling of the battery, but also utilizes the heat of the battery for air conditioner heating, significantly improves the energy utilization efficiency of the system, and reduces the energy consumption of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioners, in particular to a double-return-air air conditioning system, a control method of the double-return-air air conditioning system and an electronic device. BACKGROUND

[0002] With the rapid development of the new energy vehicle industry, higher requirements are put forward for the efficient integration design of the vehicle air conditioning system and the battery thermal management system. These systems are crucial for maintaining vehicle performance and passenger comfort. The traditional vehicle air conditioning system mainly relies on components such as compressors, outdoor heat exchangers, indoor heat exchangers and throttling valves to adjust the temperature in 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 works within an optimal temperature range.

[0003] In the process of implementing the present application, the inventors found that the prior art at least has the following technical problems: limited by the structural design of the parallel connection of the battery heat dissipation heat exchanger and the indoor heat exchanger, the battery heat dissipation problem is prominent, and the existing system is difficult to effectively dissipate heat from the battery while heating indoors. At the same time, this 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

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

[0006] A double-return-air 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.

[0007] Among them:

[0008] One end of the indoor heat exchanger is connected to the exhaust port of the double-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 double-cylinder compressor.

[0009] The battery heat dissipation heat exchanger comprises a first channel and a second channel which 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, the other end is connected with one end of the first channel, the other end of the first channel is connected with the second suction port of the double-cylinder compressor, and the second channel is used for connecting with the battery unit in series to cool the high-temperature cooling liquid of the battery unit into low-temperature cooling liquid.

[0010] One end of the control valve is connected between the first suction port and the outdoor heat exchanger, and the other end is connected between the second suction port and the first channel, and the control valve is in conduction between the two ends after being opened.

[0011] Optionally, the double-return-air air conditioning system further comprises a four-way reversing valve, wherein:

[0012] The first interface of the four-way reversing valve is connected with the exhaust port, the second interface of the four-way reversing valve is connected with the outdoor heat exchanger, the third interface of the four-way reversing valve is connected with the indoor heat exchanger, and the fourth interface of the four-way reversing valve is connected with the first suction port;

[0013] When the four-way reversing valve is in a first state, the first interface is in conduction with the third interface, and the second interface is in conduction with the fourth interface; when the four-way reversing valve is in a second state, the first interface is in conduction with the second interface, and the third interface is in conduction with the fourth interface.

[0014] Optionally, the double-return-air air conditioning system further comprises:

[0015] A gas-liquid separator is located between the fourth interface and the first suction port;

[0016] An indoor fan is arranged adjacent to the indoor heat exchanger and is used for realizing forced convection heat exchange between the indoor heat exchanger and indoor air;

[0017] An outdoor fan is arranged adjacent to the outdoor heat exchanger and is used for realizing forced convection heat exchange between the outdoor heat exchanger and outdoor air.

[0018] Optionally, the double-return-air air conditioning system further comprises:

[0019] A drying filter is located between the outdoor heat exchanger and the first expansion valve.

[0020] Optionally, the double-return-air air conditioning system further comprises a third expansion valve, wherein:

[0021] One end of the third expansion valve is connected between the drying filter and the first expansion valve, and the other end is connected between the first channel and the second expansion valve.

[0022] Optionally, the double-loop air conditioning system further comprises a water pump and a battery unit, wherein:

[0023] One end of the water pump is connected to one end of the second channel, and the other end is used for connecting to the water inlet of the battery unit, and the water outlet of the battery unit is used for connecting to the other end of the second channel.

[0024] Optionally, the double-loop air conditioning system further comprises an expansion tank, wherein:

[0025] One end of the expansion tank is 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.

[0026] A control method of a double-loop air conditioning system, applied to the double-loop air conditioning system as claimed in any one of the preceding claims, comprising:

[0027] Obtaining the operating mode and operating parameters of the double-loop air conditioning system;

[0028] When the operating mode is the indoor heating mode and the battery cooling mode, controlling the four-way reversing valve to be in the first state, and determining the battery set temperature according to the operating parameters;

[0029] Detecting the outlet water temperature of the battery unit, and determining whether the battery set temperature is less than the outlet water temperature;

[0030] If yes, determining whether the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve and the first expansion valve are in the open state;

[0031] If in the open state, controlling the second expansion valve and the water pump to be in the open state, and controlling the control valve to be in the closed state;

[0032] Determining whether the battery set temperature is greater than or equal to the outlet water temperature;

[0033] If the battery set temperature is less than the outlet water temperature, returning to the step of determining whether the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve and the first expansion valve are in the open state;

[0034] If the battery set temperature is greater than or equal to the outlet water temperature, controlling the second expansion valve and the water pump to be in the closed state, and controlling the control valve to be in the open state;

[0035] According to the operating mode, determining whether the double-loop air conditioning system exits the battery cooling mode;

[0036] If the battery cooling mode is not exited, the step of detecting the outlet water temperature of the battery unit and determining whether the battery set temperature is less than the outlet water temperature is performed again.

[0037] If the battery cooling mode is exited, the battery cooling mode is ended.

[0038] Optionally, after the step of determining whether the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve and the first expansion valve are in the open state, the method further comprises:

[0039] When the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve and the first expansion valve are not in the open state, the four-way reversing valve is controlled to be in the second state.

[0040] The water pump, the double-cylinder compressor, the outdoor fan, the control valve and the third expansion valve are controlled to be in the open state.

[0041] It is determined whether the battery set temperature is greater than or equal to the outlet water temperature.

[0042] If not, the step of controlling the water pump, the double-cylinder compressor, the outdoor fan, the control valve and the third expansion valve to be in the open state is performed again.

[0043] If yes, the water pump, the double-cylinder compressor, the outdoor fan, the control valve and the third expansion valve are controlled to be in the closed state.

[0044] It is determined whether the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve and the first expansion valve are in the open state according to the operating mode.

[0045] If the battery cooling mode is not exited, the step of detecting the outlet water temperature of the battery unit and determining whether the battery set temperature is less than the outlet water temperature is performed again.

[0046] If the battery cooling mode is exited, the battery cooling mode is ended.

[0047] Optionally, when the operating mode is the indoor heating mode and the battery cooling mode, the method further comprises:

[0048] An indoor set temperature is determined according to the operating parameter.

[0049] An indoor temperature is detected, and it is determined whether the indoor set temperature is greater than the indoor temperature.

[0050] If yes, the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve and the first expansion valve are controlled to be in the open state.

[0051] judging whether the indoor set temperature is less than or equal to the indoor temperature;

[0052] if the indoor set temperature is less than or equal to the indoor temperature, controlling the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve and the first expansion valve to be in a closed state;

[0053] when the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve and the first expansion valve are in the closed state, judging whether the double-refrigerant air conditioning system exits the indoor heating mode according to the operation mode;

[0054] if the indoor heating mode is not exited, returning to execute the step of judging whether the indoor set temperature is greater than the indoor temperature;

[0055] if the indoor heating mode is exited, ending the indoor heating mode.

[0056] An electronic device comprises:

[0057] a processor and a memory for storing at least one instruction, which is loaded and executed by the processor to implement the control method of the double-refrigerant air conditioning system according to any one of the above.

[0058] The double-refrigerant air conditioning system provided by the embodiments of the present application has at least the following beneficial effects:

[0059] The double-refrigerant air conditioning system provided by the present application realizes the double-refrigerant design by adopting the double-cylinder compressor, the double expansion valve and the control valve, so that the outdoor heat exchanger and the battery heat dissipation heat exchanger do not affect each other when working at the same time due to different evaporation temperatures, and the independent control precision of the air conditioning heating and the battery heat dissipation is improved. At the same time, the first passage and the second passage of the battery heat dissipation heat exchanger are used for mutual heat exchange when the system is air conditioning heating, which not only realizes the cooling of the battery, but also uses the heat of the battery for air conditioning heating, allows the system to effectively dissipate heat for the battery while maintaining the comfortable temperature in the vehicle, and significantly improves the energy utilization efficiency of the system and reduces the energy consumption of the system.

[0060] In summary, the present application can effectively improve the problems of low control precision and low overall performance of the air conditioning system in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0061] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0062] Figure 1 A structure schematic diagram of a double-return-air air conditioning system provided by an embodiment of the present application;

[0063] Figure 2 A principle diagram of a double-return-air air conditioning system provided by an embodiment of the present application when the system is in both air conditioning heating mode and battery cooling mode;

[0064] Figure 3 A principle diagram of a double-return-air air conditioning system provided by an embodiment of the present application when the system is in battery cooling mode only;

[0065] Figure 4 A principle diagram of a double-return-air air conditioning system provided by an embodiment of the present application when the system is in air conditioning heating mode only;

[0066] Figure 5 A flow chart of a control method of a double-return-air air conditioning system provided by an embodiment of the present application;

[0067] Figure 6 A flow chart of another control method of a double-return-air air conditioning system provided by an embodiment of the present application;

[0068] Figure 7 A flow chart of still another control method of a double-return-air air conditioning system provided by an embodiment of the present application.

[0069] Explanation of reference signs:

[0070] 1, compressor, 101, first suction port, 102, second suction port, 103, discharge 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

[0071] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0072] It should be clear that the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0073] The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the application and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0074] It should be understood that the term "and / or" as used herein merely describes associated objects, which can exist in three relationships, for example, A and / or B can represent three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0075] Please refer to Figure 1 The structure of a double-loop air conditioning system provided by the embodiment of the application is shown in the figure. The double-loop air conditioning system can be applied to a new energy vehicle, which includes an electric bus, an electric logistics vehicle, an electric truck, and an electric engineering vehicle. Figure 1 As shown in the figure, the double-loop air conditioning system includes:

[0076] A double-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.

[0077] Among them:

[0078] One end of the indoor heat exchanger 9 is connected with the exhaust port 103 of the double-cylinder compressor 1, and the other end is connected with one end of the outdoor heat exchanger 4 through the first expansion valve 6. The other end of the outdoor heat exchanger 4 is connected with the first suction port 101 of the double-cylinder compressor 1.

[0079] 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 with one end of the first channel 801. The other end of the first channel 801 is connected with the second suction port 102 of the double-cylinder compressor 1. The second channel 802 is used to be connected in series with the battery unit 15 to cool the high-temperature cooling liquid of the battery unit 15 into low-temperature cooling liquid.

[0080] The control valve 12 can be an electromagnetic valve, one end of the control valve 12 is connected between the first suction port 101 and the outdoor heat exchanger 4, the other end is connected between the second suction port 102 and the first channel 801, and the control valve 12 is open between the two ends. It can be understood that the battery unit 15 can include a battery and a battery heat exchange structure in contact with the battery, and the battery heat exchange structure can circulate the cooling liquid, so that the low-temperature cooling liquid flows into the heat exchange structure to absorb the heat generated by the battery and convert it into high-temperature cooling liquid, and the high-temperature cooling liquid flows through the second channel 802 of the battery heat dissipation heat exchanger 8. The low-temperature refrigerant in the first channel 801 exchanges heat to transfer the heat carried by the cooling liquid to the refrigerant, thereby obtaining low-temperature cooling liquid, and the low-temperature cooling liquid flows back to the battery heat exchange structure, and so on, to continuously meet the battery heat dissipation demand. It should be noted that the battery of the battery unit 15 can be the whole vehicle battery of a new energy vehicle.

[0081] In this embodiment, by setting one end of the indoor heat exchanger 9 to be connected with the exhaust port 103 of the double-cylinder compressor 1, and the other end to be connected with one end of the outdoor heat exchanger 4 through the first expansion valve 6, and the other end of the outdoor heat exchanger 4 to be connected with the first suction port 101 of the double-cylinder compressor 1, an indoor heating system is formed, and a heating cycle can be realized.

[0082] The double-cylinder compressor 1 has two cylinders, when the double-cylinder compressor 1 works, the two cylinders complete suction through the corresponding first suction port 101 and second suction port 102 respectively, and the two cylinders compress the refrigerant into high-temperature and high-pressure gas, which is combined in front of the exhaust port 103 and sent to the indoor heat exchanger 9 through the exhaust port 103. Here, the refrigerant exchanges heat with indoor air through the indoor heat exchanger 9, releases heat, and makes the indoor air warm. Subsequently, the refrigerant passes through the first expansion valve 6, throttles and depressurizes, becomes low-temperature and low-pressure liquid (or 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 double-cylinder compressor 1 through the other end of the outdoor heat exchanger 4.

[0083] In this embodiment, by setting one end of the indoor heat exchanger 9 to be connected with the exhaust port 103 of the double-cylinder compressor 1, and the other end to be connected with one end of the outdoor heat exchanger 4 through the first expansion valve 6, and the other end of the outdoor heat exchanger 4 to be connected with the first suction port 101 of the double-cylinder compressor 1, an indoor heating system is formed, and a heating cycle can be realized.

[0082] The double-cylinder compressor 1 has two cylinders, when the double-cylinder compressor 1 works, the two cylinders complete suction through the corresponding first suction port 101 and second suction port 102 respectively, and the two cylinders compress the refrigerant into high-temperature and high-pressure gas, which is combined in front of the exhaust port 103 and sent to the indoor heat exchanger 9 through the exhaust port 103. Here, the refrigerant exchanges heat with indoor air through the indoor heat exchanger 9, releases heat, and makes the indoor air warm. Subsequently, the refrigerant passes through the first expansion valve 6, throttles and depressurizes, becomes low-temperature and low-pressure liquid (or 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 double-cylinder compressor 1 through the other end of the outdoor heat exchanger 4.

[0083] In this embodiment, by setting one end of the indoor heat exchanger 9 to be connected with the exhaust port 103 of the double-cylinder compressor 1, and the other end to be connected with one end of the outdoor heat exchanger 4 through the first expansion valve 6, and the other end of the outdoor heat exchanger 4 to be connected with the first suction port 101 of the double-cylinder compressor 1, an indoor heating system is formed, and a heating cycle can be realized.

[0084] In the heat exchange process, the coolant in the battery cell 15 releases heat to the refrigerant, its temperature decreases, and then circulates back to the battery cell 15 to continue to absorb heat, maintaining the battery within a safe operating temperature range. After heat exchange, the temperature of the refrigerant increases, and it absorbs heat and evaporates into a gaseous state, entering the second suction port 102 of the double-cylinder compressor 1 through the other end of the first channel 801, preparing for the next cycle.

[0085] In this embodiment, the control valve 12 is connected between the first suction port 101 and the outdoor heat exchanger 4 at one end, and between the second suction port 102 and the first channel 801 at the other end. When the control valve 12 is open, the two ends are connected, and when the control valve 12 is closed, the two ends are not connected.

[0086] When the system is in both air conditioning heating mode and battery cooling mode, the control valve 12 is closed, realizing double back gas design. This design ensures that the outdoor heat exchanger 4 and the battery cooling heat exchanger 8 do not affect each other when working simultaneously due to different evaporation temperatures, improving the independent control accuracy of air conditioning heating and battery cooling, effectively ensuring that both indoor temperature and battery temperature can be effectively adjusted.

[0087] The specific operation is as follows: when the indoor heat exchanger 9 and the battery cooling heat exchanger 8 both need to work, that is, when the system is in both air conditioning heating mode and battery cooling mode, the control valve 12 is closed, so that the refrigerant after passing through the indoor heat exchanger 9, part of it flows to the outdoor heat exchanger 4 through the first expansion valve 6, and the other part flows to the battery cooling 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 need a lower evaporation temperature to absorb heat from the outside air, while the battery cooling heat exchanger 8 may need a higher evaporation temperature to effectively cool.

[0088] In contrast, when the system is only in air conditioning heating mode or battery cooling mode, the control valve 12 is opened to allow the refrigerant to flow between the two suction ports. In this way, when the system is only in air conditioning heating mode or battery cooling mode, both cylinders of the dual-cylinder compressor 1 can participate in work to avoid damage to the compressor caused by only one cylinder in working condition, thereby prolonging the service life of the dual-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 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 dual-cylinder compressor 1 through the first suction port 101 and the second suction port 102, to ensure the normal operation of the dual-cylinder compressor 1. Similarly, if only battery cooling is required, the opening of the control valve 12 allows the refrigerant flowing out of the first passage 801 of the battery cooling heat exchanger 8 to flow back to the dual-cylinder compressor 1 through the second suction port 102 and the control valve 12, to ensure the normal operation of the dual-cylinder compressor 1.

[0089] Through the intelligent control of the control valve 12, the dual-refrigerant air conditioning system can flexibly adapt to different working requirements, ensuring the efficiency of air conditioning heating and battery cooling, and considering the balanced operation of the dual-cylinder compressor 1, thereby improving the reliability and durability of the entire system.

[0090] On the basis of the above embodiment, in some embodiments, the dual-refrigerant air conditioning system further comprises a four-way valve 2, wherein:

[0091] The first interface 201 of the four-way valve 2 is connected with the exhaust port 103, the second interface 202 of the four-way valve 2 is connected with the outdoor heat exchanger 4, the third interface 203 of the four-way valve 2 is connected with the indoor heat exchanger 9, and the fourth interface 204 of the four-way valve 2 is connected with the first suction port 101 of the compressor;

[0092] When the four-way valve 2 is in the first state, the first interface 201 and the third interface 203 are conductive, and the second interface 202 and the fourth interface 204 are conductive; when the four-way valve 2 is in the second state, the first interface 201 and the second interface 202 are conductive, and the third interface 203 and the fourth interface 204 are conductive.

[0093] In the embodiment, the design of the four-way reversing valve 2 includes four interfaces, wherein the first interface 201 is connected with the exhaust port 103 of the double-cylinder compressor 1, and the high-temperature and high-pressure gaseous refrigerant discharged by the double-cylinder compressor 1 can enter the outdoor heat exchanger 4 or the indoor heat exchanger 9 to be condensed; the second interface 202 is connected with 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 by the double-cylinder compressor 1 flows into the outdoor heat exchanger 4 to be condensed, 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 low-temperature and low-pressure gaseous refrigerant passing through the outdoor heat exchanger 4 returns to the double-cylinder compressor 1; the third interface 203 is connected with the indoor heat exchanger 9, and 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 discharged by the double-cylinder compressor 1 flows into the indoor heat exchanger 9 to be condensed, in addition, when the system is only in the air conditioning cooling mode, the low-temperature and low-pressure gaseous refrigerant passing through the indoor heat exchanger 9 returns to the double-cylinder compressor 1; and the fourth interface 204 is connected with the first suction port 101 of the double-cylinder compressor 1, and the low-temperature and low-pressure gaseous refrigerant can return to the double-cylinder compressor 1 for the next cycle.

[0094] When 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 to be condensed, and at the same time, 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 double-cylinder compressor 1. When 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 to be condensed, and at the same time, 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 double-cylinder compressor 1.

[0095] On the basis of the above embodiment, in some embodiments, the double-refrigerant air conditioning system further comprises:

[0096] The gas-liquid separator 11 is located between the fourth interface 204 of the four-way reversing valve 2 and the first suction port 101 of the compressor;

[0097] The indoor fan 10 is arranged adjacent to the indoor heat exchanger 9, for example, on the air outlet side or the air inlet side of the indoor heat exchanger 9, for realizing forced convection heat exchange between the indoor heat exchanger 9 and indoor air;

[0098] The outdoor fan 3 is arranged adjacent to the outdoor heat exchanger 4, for example, on 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 outdoor air.

[0099] In the embodiment, the gas-liquid separator 11 is located between the four-way reversing valve 2 and the first suction port 101 of the double-cylinder compressor 1, which mainly prevents the low-pressure and low-temperature steam returned to the double-cylinder compressor 1 from carrying too many liquid droplets to avoid the liquid refrigerant entering the cylinder of the double-cylinder compressor 1, thereby effectively preventing liquid hammer, and has the functions of filtering, returning oil, storing liquid, etc. The indoor fan 10 is located adjacent to the indoor heat exchanger 9, which promotes heat exchange between the indoor air and the indoor heat exchanger 9 and improves the heat exchange efficiency. The outdoor fan 3 is located adjacent to the outdoor heat exchanger 4, which promotes heat exchange between the outdoor air and the outdoor heat exchanger 4 and improves the heat exchange efficiency.

[0100] On the basis of the above embodiment, in some embodiments, the double-return-air air conditioning system further comprises:

[0101] The dry filter 5 is located between the outdoor heat exchanger 4 and the first expansion valve 6.

[0102] In the embodiment, the dry filter 5 dries and filters the refrigerant output from the first expansion valve 6 or the outdoor heat exchanger 4. The dry filter 5 can absorb the moisture in the refrigerant, effectively prevent ice blockage and dirty blockage of the system pipeline, and ensure the normal operation of the refrigeration system. By arranging the dry filter 5 between the outdoor heat exchanger 4 and the first expansion valve 6, the required dryness and cleanliness of the refrigerant can be effectively ensured before entering the next link of the system, thereby improving the operation efficiency and reliability of the entire air conditioning system.

[0103] On the basis of the above embodiment, in some embodiments, the double-return-air air conditioning system further comprises a third expansion valve 13, wherein:

[0104] One end of the third expansion valve 13 is connected with the dry filter 5 and the first expansion valve 6, that is, the one end of the third expansion valve 13 is connected between the first expansion valve 6 and the dry filter 5, and the other end is connected between the first channel 801 and the second expansion valve 7.

[0105] In the embodiment, the third expansion valve 13 functions to throttle, cool and depressurize the refrigerant output from the outdoor heat exchanger 4, and then input the processed refrigerant into the first channel 801 of the battery heat dissipation heat exchanger 8. This process is a key link when the system is only in the battery heat dissipation mode. Through the throttling action 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 exchanges heat with the cooling liquid in the second channel 802 inside the first channel 801, and evaporates into low-temperature and low-pressure gaseous refrigerant after absorbing heat. Finally, these gaseous refrigerants enter the second suction port 102 and pass through the control valve 12 to enter the first suction port 101, and finally enter the double-cylinder compressor 1 for the next cycle, thereby achieving the heat dissipation of the battery when the system is only in the battery heat dissipation mode.

[0106] On the basis of the above-mentioned embodiments, in some embodiments, the dual-loop air conditioning system further comprises a water pump 14, wherein:

[0107] 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. 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 cooling heat exchanger 8, the water pump 14, and the battery unit 15 can be connected in series through pipes to form a battery cooling liquid circulation loop.

[0108] In this embodiment, the dual-loop air conditioning system further integrates the water pump 14 to enhance the battery cooling function. The cooling liquid circulation path is established through the water pump 14, the battery unit 15, and the second channel 802. The water pump 14 is responsible for pushing the battery cooling liquid to circulate between the second channel 802 and the battery unit 15. When the battery generates heat, the cooling liquid 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 cooling heat exchanger 8. The high-temperature cooling liquid in the second channel 802 releases heat by exchanging heat with the refrigerant in the first channel 801, and the temperature decreases. The cooled cooling liquid is then circulated back to the battery unit 15 through the water pump 14 to continue to absorb heat, achieving effective cooling of the battery.

[0109] Through this integrated design, the dual-loop air conditioning system of this embodiment not only can independently control indoor heating and battery cooling, but also can recover the heat generated by the battery while heating, improving energy utilization efficiency and enhancing system energy efficiency and comfort.

[0110] On the basis of the above-mentioned embodiments, in some embodiments, the dual-loop air conditioning system further comprises an expansion tank 16, wherein:

[0111] One end of the expansion 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.

[0112] In this embodiment, the dual-loop air conditioning system further integrates the expansion tank 16, which can play a role in buffering and stabilizing the pressure in the cooling liquid circulation system. When the cooling liquid in the battery unit 15 changes in volume due to temperature changes during circulation, the expansion tank 16 provides the necessary space to accommodate these changes. When the cooling liquid expands due to heating, the excess liquid will be guided into the expansion tank 16, and when the cooling liquid contracts due to cooling, the liquid in the expansion tank 16 can flow back to the second channel 802, effectively ensuring the continuity and stability of the cooling liquid circulation.

[0113] In addition, the expansion tank 16 also helps to separate and remove gas in the system. During the cooling liquid circulation process, there may be gas dissolved in the liquid, which can be released and collected in the expansion tank 16, thereby reducing the cavitation phenomenon in the system and improving the heat exchange efficiency.

[0114] Through this design, the dual-loop air conditioning system of the present embodiment not only can independently control indoor heating and battery cooling, but also can effectively manage the circulation and pressure of the cooling liquid, improving the reliability and stability of the system. The addition of the expansion tank 16 provides a more perfect 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 prolonging the service life of the battery and improving the performance of the vehicle.

[0115] Please refer to Figure 2 , a schematic diagram of the dual-loop air conditioning system provided by the embodiment of the present application when it is in both air conditioning heating mode and battery cooling mode. As Figure 2 shown:

[0116] When the dual-loop air conditioning system is in both air conditioning heating mode and battery cooling mode, the low-temperature and low-pressure gaseous refrigerant is compressed by the compressor into high-temperature and high-pressure steam, flows through the four-way valve 2 into 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. Then it is divided into two paths:

[0117] One path flows through the first expansion valve 6 to throttle into low-temperature and low-pressure gas-liquid two-phase refrigerant, flows through the dry filter 5 into the outdoor heat exchanger 4, absorbs outdoor air heat to evaporate into low-temperature and low-pressure gaseous refrigerant, and then flows through the four-way valve 2 into the gas-liquid separator 11. At this time, the control valve 12 is in the closed state and not conductive at both ends, so the refrigerant from this path enters the double-cylinder compressor 1 for compression from the first suction port 101;

[0118] The other path of medium-temperature and high-pressure liquid refrigerant flows through the second expansion valve 7 to throttle into 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 cooling heat exchanger 8, evaporates into low-temperature and low-pressure gaseous refrigerant after absorbing the cooling liquid heat, and then enters the double-cylinder compressor 1 for compression through the second suction port 102.

[0119] The cooling liquid of the battery is powered by the water pump 14, and the cooling liquid in the battery unit 15 absorbs the heat of the battery and then releases heat through the second channel 802 of the battery heat dissipation heat exchanger 8, and after the temperature is reduced, it returns to the battery unit 15 to absorb heat, and so on, realizing the battery heat dissipation function. When the cooling liquid is heated and expanded, the excess liquid will be guided to the expansion tank 16, and when the cooling liquid is cooled and contracted, the liquid in the expansion tank 16 can flow back to the second channel 802, effectively ensuring the continuity and stability of the cooling liquid circulation.

[0120] Please refer to Figure 3 , a principle diagram of a double-return-air air conditioning system provided by the embodiment of the application when only in a battery heat dissipation mode. As shown in Figure 3 ,

[0121] When the double-return-air 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 valve 2, and enters the outdoor heat exchanger 4. The heat is released to the outside by forced convection heat exchange through the outdoor fan 3, and is condensed into medium-temperature and high-pressure liquid refrigerant. At this time, the first expansion valve 6 and the second expansion valve 7 are in the closed state, so that the medium-temperature and high-pressure liquid refrigerant flows through the dry filter 5 and enters the third expansion valve 13 to be throttled into low-temperature and low-pressure gas-liquid two-phase refrigerant, and enters the first channel 801 of the battery heat dissipation heat exchanger 8. Absorb the heat of the cooling liquid in the second channel 802 to evaporate into low-temperature and low-pressure gaseous refrigerant. At this time, the control valve 12 is in the open state and the two ends are conducted, so that the low-temperature and low-pressure gaseous refrigerant in the first channel 801 enters the double-cylinder compressor 1 from the first suction port 101 and the second suction port 102 respectively.

[0122] The battery heat dissipation process of the double-return-air air conditioning system only in the battery heat dissipation mode can refer to the battery heat dissipation process of the double-return-air air conditioning system in the air conditioning heating mode and the battery heat dissipation mode. Here, it will not be repeated.

[0123] Please refer to Figure 4 , a principle diagram of a double-return-air air conditioning system provided by the embodiment of the application when only in a battery heat dissipation mode. As shown in Figure 4 ,

[0124] When the dual-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, enters the indoor heat exchanger 9 after flowing through the four-way reversing valve 2, releases heat through forced convection heat exchange by the indoor fan 10, and is condensed 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 that the medium-temperature and high-pressure liquid refrigerant flows through the first expansion valve 6 to be throttled into low-temperature and low-pressure gas-liquid two-phase refrigerant, enters the outdoor heat exchanger 4 after flowing through the dry filter 5, absorbs outdoor air heat to evaporate into low-temperature and low-pressure gaseous refrigerant, and then enters the gas-liquid separator 11 after flowing through the four-way reversing valve 2. At this time, the control valve 12 is in an open state and both ends are conducted, so that the refrigerant enters the dual-cylinder compressor 1 from the first suction port 101 and the second suction port 102 for compression.

[0125] At this time, the battery cooling system does not work, and the water pump 14 is in a closed state.

[0126] Based on the above technical scheme, the dual-return air conditioning system provided by the application realizes dual-return air design by adopting a dual-cylinder compressor 1, dual expansion valves and a control valve 12, so that when the outdoor heat exchanger 4 and the battery cooling heat exchanger 8 work at the same time, they will not affect each other due to different evaporation temperatures, thereby improving the independent control precision of air conditioning heating and battery cooling. At the same time, when the system is in air conditioning heating, the first channel 801 and the second channel 802 of the battery cooling heat exchanger 8 exchange heat with each other, which not only cools the battery, but also uses the heat of the battery for air conditioning heating, allowing the system to effectively cool the battery while maintaining the comfortable temperature in the vehicle, thereby significantly improving the energy utilization efficiency of the system and reducing the energy consumption of the system.

[0127] It can be understood that the dual-return air conditioning system also includes a controller and pressure sensors and temperature sensors to better control the operation of the air conditioner. The arrangement of the controller and the pressure sensors and the temperature sensors can refer to the existing air conditioning technology, which will not be described here.

[0128] Please refer to Figure 5 The flow chart of the control method of the dual-return air conditioning system provided by the embodiment of the application includes the following steps:

[0129] Step S01, obtaining the operation mode and operation parameters of the dual-return air conditioning system.

[0130] In this embodiment, the dual-return air conditioning system can monitor the operation mode and operation parameters of the system in real time through the integrated detection module. For example, the operation mode can include the air conditioning heating mode and the battery cooling mode, and the operation parameters can include the indoor set temperature, the indoor temperature, and the battery set temperature and the outlet water temperature of the battery unit 15.

[0131] Step S02, when the operation mode is indoor heating mode and battery cooling mode, control the four-way reversing valve 2 to be in the first state, and determine the battery set temperature according to the operation parameters.

[0132] In this embodiment, when the operation mode of the dual-loop air conditioning system is set to indoor heating mode and 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 is connected with the third interface 203, and the second interface 202 is connected with the fourth interface 204. Such control makes the dual-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 in the open state, so that the refrigerant can flow as needed in the refrigeration cycle: the high-temperature and high-pressure gaseous refrigerant discharged by the dual-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 evaporates in the outdoor heat exchanger 4 and flows into the first suction port 101 of the dual-cylinder compressor 1 through the second interface 202 and the fourth interface 204.

[0133] Step S03, detect the outlet water temperature of the battery unit 15, and determine whether the battery set temperature is less than the outlet water temperature.

[0134] If yes, execute step S04; if no, execute step S08.

[0135] In this embodiment, by comparing the battery set temperature with the actual outlet water temperature, the system can determine whether the current battery cooling is sufficient. If the outlet water temperature is higher than the battery set temperature, it means that the battery still needs to be cooled to maintain the battery within a safe and efficient working temperature range. Therefore, if the battery set temperature is less than the outlet water temperature (i.e., the outlet water temperature is higher), the system will execute step S04 to further check (or determine) the state of the dual-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6.

[0136] On the contrary, if the outlet water temperature is not higher than the battery set temperature, it means that the battery cooling demand is low or has been met. In this case, the system will execute step S08 to assess whether it needs to end the battery cooling mode.

[0137] This embodiment allows the system to dynamically adjust its operating state according to the actual cooling demand of the battery. By precisely controlling the opening and closing of the cooling components, the system can effectively manage the battery temperature while optimizing energy use and equipment life. This method improves the intelligent level of the new energy vehicle thermal management system, effectively ensures that the battery can be properly cooled under various working conditions, thereby improving the performance and reliability of the whole vehicle.

[0138] Step S04, judging whether the double-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.

[0139] If yes, step S05 is executed.

[0140] In this embodiment, the system performs a series of state checks of key components, the purpose of which is to confirm whether the heating components in the system are working and continuously providing heat to the vehicle interior according to the states of these components. If all of these components are open, step S05 is executed.

[0141] It can be understood that, in order to avoid damage to the double-cylinder compressor 1 due to single-cylinder operation, the control valve 12 can be set to be open by default, and during operation of the double-recovery air conditioning system, it is further judged whether the control valve 12 needs to be closed, and the control valve 12 is closed when needed, so as to improve the independent control precision of the air conditioning heating and the battery cooling.

[0142] Step S05, controlling the second expansion valve 7 and the water pump 14 to be in the open state, and controlling the control valve 12 to be in the closed state.

[0143] In this embodiment, when the double-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 is proved that the heating components in the system are working and continuously providing heat to the vehicle interior. 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 cooling circuit can operate independently of the indoor heating circuit. The opening of the second expansion valve 7 allows low-temperature and low-pressure refrigerant to flow into the battery cooling heat exchanger 8, and the opening of the water pump 14 drives the cooling liquid to circulate between the battery cooling 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 cooling heat exchanger 8 do not affect each other when they work at the same time due to different evaporation temperatures, thereby improving the independent control precision of the air conditioning heating and the battery cooling, and effectively ensuring that the indoor temperature and the battery temperature can be effectively adjusted.

[0144] Step S06, judging whether the battery set temperature is greater than or equal to the outlet water temperature.

[0145] If yes, step S07 is executed; if no, step S04 is executed to judge whether the double-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.

[0146] In this embodiment, the system compares the battery set temperature with the outlet water temperature of the battery unit 15. If the battery set temperature is less than the outlet water temperature, it indicates that heat dissipation needs to continue. In this case, the system will return to step S04, recheck and ensure that the double-cylinder compressor 1, indoor fan 10, outdoor fan 3, control valve 12 and first expansion valve 6 are in the open state to maintain indoor heating and continue battery heat dissipation.

[0147] On the contrary, if the battery set temperature is greater than or equal to the outlet water temperature, it means that the battery has reached or is below the preset safe working temperature, and no additional heat dissipation measures are needed. Therefore, the system will perform step S07, closing the second expansion valve 7 and water pump 14, while opening the control valve 12, to stop the operation of the battery heat dissipation circuit and maintain the indoor heating mode.

[0148] Step S07, control the second expansion valve 7 and water pump 14 in the closed state, and control the control valve 12 in the open state.

[0149] In this embodiment, after the battery temperature is controlled, by controlling the second expansion valve 7 and water pump 14 in the closed state, and controlling the control valve 12 in the open state, to optimize the energy distribution of the system and the service life of the components. Closing the second expansion valve 7 and water pump 14 can reduce energy consumption, this control logic helps to improve the energy efficiency of the system, ensures that while meeting the indoor heating demand, the battery temperature can also be effectively managed, thereby improving the overall performance and reliability of new energy vehicles.

[0150] Step S08, according to the operation mode, determine whether the double-reverse air conditioning system exits the battery heat dissipation mode.

[0151] If yes, perform step S09; if no, return to step S03 to detect the outlet water temperature of the battery unit 15 and determine whether the battery set temperature is less than the outlet water temperature.

[0152] Step S09, end the battery heat dissipation mode.

[0153] Based on the above technical solution, the embodiment realizes accurate 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 accurate 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 battery heat dissipation efficiency. When the battery temperature is higher than the set value, the system starts 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 to optimize energy use and protect the double-cylinder compressor 1. This method not only improves the energy efficiency and comfort of the air conditioning system, but also reduces unnecessary wear and tear on the compressor through accurate control, prolonging its service life.

[0154] Please refer to Figure 6 , the flowchart of another control method of the dual-return air conditioning system provided by the embodiment of the application. Based on the above embodiment, in some embodiments, after judging whether the double-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 steps shown in Figure 6 may also be performed.

[0155] Step S11, when the double-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, control the four-way reversing valve 2 to be in the second state.

[0156] In this embodiment, when the double-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 proves that the heating components in the system are not working at this time, and no heat is provided for the vehicle. At this time, the system controls the four-way reversing valve 2 to be in the second state, realizing the conduction between the first interface 201 and the second interface 202, and the conduction between the third interface 203 and the fourth interface 204.

[0157] This control mode makes the flow direction of the refrigerant adapt to the needs of battery heat dissipation when the water pump 14, the double-cylinder compressor 1, the outdoor fan 3, the control valve 12, and the third expansion valve 13 are in the open state: the high-temperature and high-pressure gas discharged by the double-cylinder compressor 1 flows into the outdoor heat exchanger 4 through the first interface 201 and the second interface 202, and is condensed by releasing heat in the outdoor heat exchanger 4.

[0158] Step S12, control the water pump 14, the double-cylinder compressor 1, the outdoor fan 3, the control valve 12, and the third expansion valve 13 to be in the open state.

[0159] In this embodiment, to ensure that the system can comprehensively dissipate heat from the battery while maintaining or switching to the required air conditioning operating mode, the system can effectively circulate the cooling liquid, promote the flow of refrigerant, and adjust the heat exchange process by turning on these components, thereby achieving precise temperature control of the battery.

[0160] Step S13: Determine whether the battery set temperature is greater than or equal to the outlet water temperature.

[0161] If yes, execute step S14; if no, return to step S12 to control the water pump 14, the double-cylinder compressor 1, the outdoor fan 3, the control valve 12, and the third expansion valve 13 to be in the open state.

[0162] In this embodiment, the system detects the outlet water temperature of the battery unit 15 to determine whether the battery has reached or fallen below 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 turn off the relevant components to stop the heat dissipation process, thereby avoiding excessive heat dissipation, saving energy, and protecting system components.

[0163] On the contrary, if the battery set temperature is less than the outlet water temperature, it means that the battery still needs more heat dissipation. In this case, the system will return to step S12 to continue to maintain the open state of the water pump 14, the double-cylinder compressor 1, the outdoor fan 3, the control valve 12, and the third expansion valve 13 to continue the heat dissipation process. This feedback loop ensures that the battery temperature can be effectively controlled, effectively preventing the battery from overheating, thereby prolonging the battery life and improving the safety and reliability of the vehicle.

[0164] Step S14: Control the water pump 14, the double-cylinder compressor 1, the outdoor fan 3, the control valve 12, and the third expansion valve 13 to be in the closed state.

[0165] Step S15: Determine whether the double-reverse air conditioning system exits the battery heat dissipation mode according to the operating mode.

[0166] If yes, execute step S16; if not, return to step S03 to detect the outlet water temperature of the battery unit 15 and determine whether the battery set temperature is less than the outlet water temperature.

[0167] Step S16: End the battery heat dissipation mode.

[0168] Based on the above technical solutions, this embodiment provides a dynamic and responsive thermal management method that not only improves energy utilization efficiency but also helps protect the battery from overheating damage, thereby prolonging 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.

[0169] Please refer to Figure 7 , another flowchart of a control method of a dual-loop gas air conditioning system provided by an embodiment of the present application. Based on the above-mentioned embodiment, in some embodiments, when the operation mode is the indoor heating mode and the battery cooling mode, the system can also perform the steps shown in Figure 7 :

[0170] Step S21, determine the indoor set temperature according to the operation parameters.

[0171] Step S22, detect the indoor temperature and determine whether the indoor set temperature is greater than the indoor temperature.

[0172] If yes, perform step S23; if no, perform step S26.

[0173] In this embodiment, by monitoring the indoor temperature in real time and comparing it with the indoor temperature set by the user, the purpose is to ensure the comfort of the indoor environment while optimizing energy use. If the detected indoor temperature is lower than the indoor set temperature, it means that more heat is needed to raise the indoor temperature to meet the user's comfort requirements. In this case, the system will execute step S23 to start or maintain the indoor heating process by turning on the dual-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12 and the first expansion valve 6. It can be understood that here the control valve 12 is turned on based on the fact that the dual-loop gas air conditioning system may be in the indoor heating single open or battery cooling single open, etc. For example, the dual-loop gas air conditioning system is in the indoor heating single open, the user changes the demand and needs to switch from indoor heating single open to indoor heating and battery cooling simultaneous open, in order to avoid damage to the dual-cylinder compressor 1, the control valve 12 is turned on first, and whether to close the control valve 12 during operation is determined, that is, during the operation of the indoor heating mode and the battery cooling mode, the control valve 12 will be closed, so as to independently control the indoor heating and the battery cooling, and improve the control precision.

[0174] On the contrary, if the indoor temperature has reached or exceeded the indoor set temperature, it means that the indoor environment is already warm enough, or it may be overheated. In this case, the system will execute step S26.

[0175] This embodiment provides an automatic temperature adjustment mechanism, which can intelligently adjust the operation state of the air conditioning system according to the comparison result of the actual indoor temperature and the user set temperature. This not only improves the energy utilization efficiency and reduces energy waste, but also ensures the comfort of the indoor environment and improves the passenger's satisfaction. In this way, the dual-loop gas air conditioning system can more accurately control the indoor temperature while considering the needs of energy saving and environmental protection.

[0176] Step S23, control the dual-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.

[0177] Step S24, determine whether the indoor set temperature is less than or equal to the indoor temperature.

[0178] If yes, proceed to step S25; if no, return to step S23 to control the double-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.

[0179] 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 satisfied, and the system no longer needs additional heating. In this case, the system will proceed to step S25 to turn off the double-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 the indoor from overheating.

[0180] If the indoor set temperature is greater than the indoor temperature, the system will return to step S23 to continue to keep the heating components in an open state and continue heating to increase the indoor temperature until the user-set comfort level is reached.

[0181] Step S25, control the double-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.

[0182] Step S26, when the double-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 are in a closed state, determine whether the double-reverse air conditioning system exits the indoor heating mode according to the current operation mode.

[0183] If no, return to step S22 to detect the indoor temperature and determine whether the indoor set temperature is greater than the indoor temperature.

[0184] If yes, proceed to step S27.

[0185] In this embodiment, the system will check whether the double-cylinder compressor 1, the indoor fan 10, the outdoor fan 3, the control valve 12, and the first expansion valve 6 are all in a 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.

[0186] If the current operation mode is the indoor heating mode, the system will return to step S22 to continue to monitor the indoor temperature and compare it with the indoor set temperature to decide whether to restart the heating components. This cycle ensures that the indoor temperature can be continuously monitored and automatically adjusted if necessary to maintain the user's comfort level.

[0187] 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 can 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 components when not needed.

[0188] Step S27, end the indoor heating mode.

[0189] Based on the above technical solutions, the 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 precisely 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 user's set comfort range.

[0190] It can be understood that when the operation mode is the indoor heating mode, i.e., the indoor heating mode is running alone, steps S21-S27 can also be executed.

[0191] The embodiment provides an electronic device, including a processor and a memory, the memory is used to store at least one instruction, the instruction is loaded and executed by the processor to realize the control method of the double-return air conditioning system described above, its execution mode and beneficial effects are similar, here will not repeat.

[0192] The embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the control method of the double-return air conditioning system described above, its execution mode and beneficial effects are similar, here will not repeat.

[0193] It should be noted that although the above describes each step in a specific order, it does not mean that each step must be executed in the above specific order, in fact, some of these steps can be executed concurrently, or even the order is changed, as long as the required function can be realized.

[0194] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A dual return air conditioning system, characterized by, Comprise: 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; Wherein: One end of the indoor heat exchanger is connected with the exhaust port of the double-cylinder compressor, and the other end is connected with one end of the outdoor heat exchanger through the first expansion valve, and the other end of the outdoor heat exchanger is connected with the first suction port of the double-cylinder compressor; The battery heat dissipation heat exchanger comprises a first channel and a second channel which 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 with one end of the first channel, the other end of the first channel is connected with the second suction port of the double-cylinder compressor, and the second channel is used to be connected with the battery unit in series to cool the high-temperature cooling liquid of the battery unit into low-temperature cooling liquid; One end of the control valve is connected between the first suction port and the outdoor heat exchanger, and the other end is connected between the second suction port and the first channel, and the control valve is conducted between the two ends after being opened; The double-back gas air conditioning system further comprises a four-way reversing valve, wherein: The first interface of the four-way reversing valve is connected with the exhaust port, the second interface of the four-way reversing valve is connected with the outdoor heat exchanger, the third interface of the four-way reversing valve is connected with the indoor heat exchanger, and the fourth interface of the four-way reversing valve is connected with the first suction port; And when the four-way reversing valve is in the first state, the first interface and the third interface are conducted, and the second interface and the fourth interface are conducted; when the four-way reversing valve is in the second state, the first interface and the second interface are conducted, and the third interface and the fourth interface are conducted; The double-back gas air conditioning system further comprises: A dry filter located between the outdoor heat exchanger and the first expansion valve; The double-back gas air conditioning system further comprises a third expansion valve, wherein: One end of the third expansion valve is connected between the dry filter and the first expansion valve, and the other end is connected between the first channel and the second expansion valve.

2. The dual return gas air conditioning system of claim 1, wherein, The double-back gas air conditioning system further comprises: A gas-liquid separator located between the fourth interface and the first suction port; An indoor fan arranged adjacent to the indoor heat exchanger for realizing forced convection heat exchange between the indoor heat exchanger and indoor air; An outdoor fan arranged adjacent to the outdoor heat exchanger for realizing forced convection heat exchange between the outdoor heat exchanger and outdoor air.

3. The dual return air air conditioning system of claim 1, wherein, The double-back gas air conditioning system further comprises a water pump, wherein: One end of the water pump is connected with one end of the second channel, and the other end is used to be connected with the water inlet of the battery unit, and the water outlet of the battery unit is used to be connected with the other end of the second channel.

4. The dual return gas air conditioning system of claim 3, wherein, The double-back gas air conditioning system further comprises an expansion tank, wherein: One end of the expansion 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.

5. A control method of a dual return air conditioning system, applied to the dual return air conditioning system according to any one of claims 1 to 4, characterized in that, Comprise: Obtaining the operating mode and operating parameters of the double-back gas air conditioning system; controlling the four-way reversing valve to be in the first state, and determining a battery set temperature according to the operation parameter when the operation mode is the indoor heating mode and the battery heat dissipation mode; detecting a water outlet temperature of the battery unit, and determining whether the battery set temperature is less than the water outlet temperature; if yes, determining whether the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are in the open state; if yes, controlling the second expansion valve and the water pump to be in the open state, and controlling the control valve 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 less than the water outlet temperature, returning to the step of determining whether the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are in the open state; if the battery set temperature is greater than or equal to the water outlet temperature, controlling the second expansion valve and the water pump to be in the closed state, and controlling the control valve to be in the open state; determining whether the double-back air conditioning system exits the battery heat dissipation mode according to the operation mode; if the double-back air conditioning system does not exit the battery heat dissipation mode, returning to the step of detecting the water outlet temperature of the battery unit and determining whether the battery set temperature is less than the water outlet temperature; if the double-back air conditioning system exits the battery heat dissipation mode, ending the battery heat dissipation mode.

6. The control method according to claim 5, characterized by after the step of determining whether the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are in the open state, the method further comprises: controlling the four-way reversing valve to be in the second state when the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve are not in the open state; controlling the water pump, the double-cylinder compressor, the outdoor fan, the control valve, and the third expansion valve to be in the open state; determining whether the battery set temperature is greater than or equal to the water outlet temperature; if no, returning to the step of controlling the water pump, the double-cylinder compressor, the outdoor fan, the control valve, and the third expansion valve to be in the open state; if yes, controlling the water pump, the double-cylinder compressor, the outdoor fan, the control valve, and the third expansion valve to be in the closed state; determining whether the double-back air conditioning system exits the battery heat dissipation mode according to the operation mode; if the double-back air conditioning system does not exit the battery heat dissipation mode, returning to the step of detecting the water outlet temperature of the battery unit and determining whether the battery set temperature is less than the water outlet temperature; if the double-back air conditioning system exits the battery heat dissipation mode, ending the battery heat dissipation mode.

7. The method of claim 5, wherein, when the operation mode is the indoor heating mode and the battery heat dissipation mode, the method further comprises: determining an indoor set temperature according to the operation parameter; detecting an indoor temperature, and determining whether the indoor set temperature is greater than the indoor temperature; if yes, controlling the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve, and the first expansion valve to be in the 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, controlling the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve and the first expansion valve to be in a closed state; when the double-cylinder compressor, the indoor fan, the outdoor fan, the control valve and the first expansion valve are in the closed state, judging whether the double-refrigerant air conditioning system exits the indoor heating mode according to the operation mode; if the indoor heating mode is not exited, returning to execute the step of judging whether the indoor set temperature is greater than the indoor temperature; if the indoor heating mode is exited, ending the indoor heating mode.

8. An electronic device, comprising: comprising: a processor and a memory for storing at least one instruction, which is loaded and executed by the processor to implement the control method of the double-refrigerant air conditioning system according to any one of claims 5-7.

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