Enthalpy increasing air conditioning system, electric vehicle and control method of enthalpy increasing air conditioning system

Abstract

The application provides an enthalpy-increasing air conditioning system, an electric vehicle and a control method of the enthalpy-increasing air conditioning system. The enthalpy-increasing air conditioning system can realize enthalpy increase of a compressor through an economizer, so that the energy efficiency ratio of the compressor is effectively improved. Meanwhile, the third heat exchanger is arranged, heat exchange between the carrier refrigerant and the refrigerant is realized through the third heat exchanger, the refrigerant absorbs the heat of the carrier refrigerant and returns to the compressor, the temperature of the refrigerant at the inlet of the compressor is improved, the compression amount of the compressor is reduced, the energy efficiency ratio of the compressor is further improved, the energy consumption is reduced, and the heating effect of the compressor is improved. Moreover, the third heat exchanger can also dissipate heat for the electric drive system, so that the heat pump system and the carrier refrigerant system are organically combined, the overall volume and weight of the enthalpy-increasing air conditioning system are reduced, and the endurance of the electric vehicle is prolonged.

Description

Technical Field

[0001] This application relates to the field of temperature control equipment technology, and in particular to an enthalpy-increasing air conditioning system, an electric vehicle, and a control method for the enthalpy-increasing air conditioning system. Background Technology

[0002] Existing automotive thermal management air conditioning systems, when heating at low temperatures, either use electric auxiliary heating or circulate refrigerant through a compressor, outdoor heat exchanger, outdoor fan, throttle valve, economizer, indoor heat exchanger, and indoor fan to heat the vehicle's interior environment. In developing this application, the inventors discovered at least the following problems with the existing technology: The vehicle's interior environment requires a heat pump system for heating. While incorporating an economizer-expansion valve can broaden the heat pump's operating range and improve compressor performance, thus enhancing the heating efficiency of the air conditioning system, overall energy consumption remains excessively high. Furthermore, the vehicle's electric drive system requires coolant circulation through components such as a water pump, water tank, heat exchanger, and fan to cool it. These two systems operate independently, occupying significant space and increasing the overall weight. Additionally, the waste heat from the electric drive system is not fully utilized, leading to energy waste to some extent. Summary of the Invention

[0003] Based on this, this application provides an enthalpy-increasing air conditioning system, an electric vehicle, and a control method for the enthalpy-increasing air conditioning system, in order to improve the problems of large overall size and weight and high energy consumption caused by the inability to organically combine the heat pump system and the refrigerant system in the prior art.

[0004] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0005] In a first aspect, embodiments of this application provide an enthalpy-increasing air conditioning system, including a heat pump system and a refrigerant system;

[0006] The heat pump system is used to circulate refrigerant and includes a compressor and a first heat exchanger, an economizer, and a second heat exchanger that are sequentially circulated and connected to the compressor to achieve a heating cycle. It also includes a third heat exchanger and a first expansion valve. The third heat exchanger includes a first channel and a second channel that can exchange heat with each other. One end of the first channel is connected to the inlet of the compressor, and the other end is connected to one end of the first expansion valve. The other end of the first expansion valve is connected between the economizer and the second heat exchanger. The system also includes a third expansion valve. The economizer includes a first flow channel and a second flow channel that can exchange heat with each other. The first flow channel is connected between the first heat exchanger and the second heat exchanger. The inlet of the second flow channel is connected in series with the third expansion valve, and the outlet of the second flow channel is connected to the enthalpy-increasing port of the compressor. The inlet of the third expansion valve is connected between the first flow channel and the second heat exchanger.

[0007] The refrigerant system is used to circulate refrigerant and includes a heat exchange module for exchanging heat with the electric drive system. The heat exchange module is connected in series with the second channel.

[0008] In one embodiment, the heat pump system further includes a four-way reversing valve and a gas-liquid separator. The four-way reversing valve includes a first port, a second port, a third port, and a fourth port. The outlet of the compressor is connected to the first port, the inlet of the compressor is connected to the outlet of the gas-liquid separator, the inlet of the gas-liquid separator is connected to the fourth port and one end of the first channel, a port of the second heat exchanger is connected to the second port, and a port of the first heat exchanger is connected to the third port.

[0009] In one embodiment, the heat pump system further includes a second expansion valve and a drying filter, with the first flow channel, the second expansion valve and the drying filter connected in series between the first heat exchanger and the second heat exchanger; the inlet of the third expansion valve is connected between the first flow channel and the second expansion valve.

[0010] In one embodiment, the refrigerant system further includes a circulating pump and an expansion tank, the circulating pump being located between the inlet of the heat exchange module and the outlet of the second channel, and the expansion tank being connected in parallel with the heat exchange module and the circulating pump.

[0011] In one embodiment, the refrigerant system further includes an electric drive radiator and a control valve, the electric drive radiator being connected in parallel with the second channel, and the control valve being used to control the flow of refrigerant flowing out of the heat exchange module to the second channel or to the electric drive radiator.

[0012] In one embodiment, the first heat exchanger is installed in an indoor environment, and the second heat exchanger is installed in an outdoor environment; the second heat exchanger and the electric drive radiator are integrated, and the second heat exchanger and the electric drive radiator operate independently.

[0013] In one embodiment, the enthalpy-increasing air conditioning system further includes an indoor fan and an outdoor fan, the indoor fan being used to increase the airflow velocity at the first heat exchanger, and the outdoor fan being used to increase the airflow velocity at the second heat exchanger and the electric drive radiator.

[0014] In one embodiment, the enthalpy-increasing air conditioning system further includes a water temperature detection device and a room temperature detection device. The water temperature detection device is used to detect the outlet water temperature of the heat exchange module, and the room temperature detection device is used to detect the indoor ambient temperature where the first heat exchanger is located.

[0015] Secondly, embodiments of this application provide an electric vehicle, including the enthalpy-enhancing air conditioning system described above.

[0016] Thirdly, this application provides a control method for an enthalpy-increasing air conditioning system, applied to the enthalpy-increasing air conditioning system described above. When the enthalpy-increasing air conditioning system is in heating mode, the control method performs the following steps:

[0017] S11. Set the indoor preset temperature T10 and the preset outlet water temperature T13 of the heat exchange module respectively, and execute steps S12 and S14 respectively.

[0018] S12. Real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is true. If yes, start the heat pump system; if no, shut down the heat pump system.

[0019] Proceed to step S13;

[0020] S13. Repeat step S12 until the enthalpy-increasing air conditioning system exits the heating mode;

[0021] S14. Real-time monitoring of the actual outlet water temperature T12 of the heat exchange module to determine whether T12≤T13 is true.

[0022] If yes, determine whether the heat pump system is turned on. If yes, control the refrigerant to flow into the second channel and open the first expansion valve. If no, maintain the current state.

[0023] If not, then control the refrigerant to prevent it from flowing into the second channel;

[0024] Proceed to step S15;

[0025] S15. Repeat step S14 until the enthalpy-increasing air conditioning system exits the heating mode.

[0026] This application has at least the following beneficial effects: The economizer enables enthalpy increase in the compressor, effectively improving its energy efficiency ratio. Simultaneously, a third heat exchanger facilitates heat exchange between the refrigerant and the secondary refrigerant. The refrigerant absorbs heat from the secondary refrigerant and returns to the compressor, increasing the refrigerant temperature at the compressor inlet, reducing the compressor's compression rate, further improving the compressor's energy efficiency ratio, reducing energy consumption, and enhancing its heating performance. Furthermore, the third heat exchanger also provides cooling for the electric drive system, organically combining the heat pump system and the secondary refrigerant system. This reduces the overall size and weight of the enthalpy-increasing air conditioning system, extending the driving range of electric vehicles.

[0027] In summary, this application can effectively improve the problems of large overall size and weight and high energy consumption caused by the inability to organically combine the heat pump system and the refrigerant system in the prior art. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an enthalpy-increasing air conditioning system according to an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the structure of an enthalpy-increasing air conditioning system according to another embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the refrigerant and coolant circulation flow in the heating mode of an enthalpy-increasing air conditioning system according to an embodiment of this application (when T12≤T13).

[0031] Figure 4 for Figure 3 A schematic diagram of the refrigerant and coolant circulation flow in a enthalpy-increasing air conditioning system in heating mode (when T12>T13).

[0032] Figure 5 for Figure 3 A schematic diagram showing the circulation flow of refrigerant and coolant in a enthalpy-increasing air conditioning system in cooling mode.

[0033] Figure 6 This is a schematic flowchart of a control method for a heating mode of an enthalpy-increasing air conditioning system according to an embodiment of this application.

[0034] Figure 7 This is a schematic flowchart of a control method for an enthalpy-increasing air conditioning system in cooling mode according to an embodiment of this application.

[0035] Note: Figures 3 to 5 The solid arrows indicate the direction of refrigerant flow, while the dashed arrows indicate the direction of coolant flow.

[0036] The meanings of the labels in the attached diagram are as follows:

[0037] 1. Heat pump system; 11. Compressor; 12. Four-way reversing valve; 121. First port; 122. Second port; 123. Third port; 124. Fourth port; 13. Gas-liquid separator; 14. First heat exchanger; 141. Indoor fan; 15. Economizer; 151. First flow channel; 152. Second flow channel; 153. Third expansion valve; 16. Dryer filter; 17. Second heat exchanger; 171. Outdoor fan; 172. Second expansion valve; 18. Third heat exchanger; 181. First channel; 182. Second channel; 183. First expansion valve;

[0038] 2. Refrigerant system; 21. Heat exchange module; 22. Control valve; 221. Inlet; 222. First outlet; 223. Second outlet; 23. Expansion tank; 24. Circulation pump; 25. Electric radiator; 26. Water temperature detection device. Detailed Implementation

[0039] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the ways in which this application may be implemented. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] In the description of this application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] Please see Figure 1 and Figure 2 The enthalpy-increasing air conditioning system with integrated waste heat recovery function in this application embodiment includes a heat pump system 1 and a refrigerant system 2.

[0044] The heat pump system 1 is used to circulate refrigerant and includes a compressor 11 and a first heat exchanger 14, an economizer 15, and a second heat exchanger 17 that are sequentially circulated and connected to the compressor 11; it also includes a third heat exchanger 18 and a first expansion valve 183. The third heat exchanger 18 includes a first channel 181 and a second channel 182 that can exchange heat with each other. The first channel 181 and the first expansion valve 183 are connected in series. The first expansion valve 183 is connected between the economizer 15 and the second heat exchanger 17 through a pipeline. The first channel 181 is also connected through... The pipeline is connected to the inlet (or suction port) of the compressor 11; it also includes a third expansion valve 153. The economizer 15 includes a first flow channel 151 and a second flow channel 152 that can exchange heat with each other. The first flow channel 151 is connected between the first heat exchanger 14 and the second heat exchanger 17. The inlet of the second flow channel 152 and the third expansion valve 153 are connected in series. The outlet of the second flow channel 152 is connected to the enthalpy-increasing port of the compressor 11. The inlet of the third expansion valve 153 is connected between the first flow channel 151 and the second heat exchanger 17.

[0045] The refrigerant system 2 is used to circulate the refrigerant and includes a heat exchange module 21. The heat exchange module 21 exchanges heat with the electric drive system and is connected in series with the second channel 182. The electric drive system includes a motor and electronic control components requiring thermal management. The refrigerant in the first channel 181 and the refrigerant in the second channel 182 can exchange heat at the third heat exchanger 18, thereby achieving heat dissipation for the electric drive system. The first heat exchanger 14 is located indoors (or inside the vehicle, i.e., the indoor side), and the second heat exchanger 17 is located outdoors (or outside the vehicle, i.e., the outdoor side). Please refer to [link / reference]. Figure 1 In heating mode, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 11 flows into the first heat exchanger 14, where it releases heat and condenses, raising the temperature of the indoor air (or gas). After condensation, the refrigerant is divided into three paths after passing through the first flow channel 151: the refrigerant in the first path flows into the second heat exchanger 17, where it absorbs heat and evaporates into a low-temperature, low-pressure gaseous refrigerant, and then flows back to the compressor 11 for the next heating cycle; the refrigerant in the second path flows into the first channel 181 after being throttled by the first expansion valve 183, where it absorbs heat from the refrigerant in the second channel 182 and evaporates into a low-temperature, low-pressure gaseous refrigerant, and then flows back to the compressor 11; the refrigerant in the third path flows into the second flow channel 152 after being throttled by the third expansion valve 153, where it absorbs heat from the refrigerant in the first flow channel 151 and evaporates into a low-temperature, low-pressure gaseous refrigerant, and then flows back to the compressor 11 through the enthalpy-increasing port. Understandably, one end of the first channel 181 is connected to the inlet of the compressor 11, and the other end is connected to one end of the first expansion valve 183. The other end of the first expansion valve 183 is connected between the economizer 15 and the second heat exchanger 17.

[0046] Specifically, in this embodiment, the heat pump system 1 further includes a four-way reversing valve 12, a gas-liquid separator 13, a second expansion valve 172, a third expansion valve 153, and a dryer filter 16. The first expansion valve 183, the second expansion valve 172, and the third expansion valve 153 may be, for example, electronic expansion valves. The economizer 15 includes a first flow channel 151 and a second flow channel 152 that can exchange heat with each other. The first heat exchanger 14 and the second heat exchanger 17 are connected in series with the first flow channel 151, the second expansion valve 172, and the dryer filter 16. The inlet of the second flow channel 152 is connected in series with the third expansion valve 153, and the outlet of the second flow channel 152 is connected to the enthalpy-increasing port of the compressor 11. The inlet of the third expansion valve 153 is connected between the first flow channel 151 and the second expansion valve 172. The four-way reversing valve 12 includes a first port 121, a second port 122, a third port 123, and a fourth port 124. The outlet (or exhaust port) of the compressor 11 is connected to the first port 121, the inlet of the compressor 11 is connected to the outlet of the gas-liquid separator 13, the inlet of the gas-liquid separator 13 is connected to the fourth port 124 and one end of the first channel 181, one port of the second heat exchanger 17 (the port away from the dryer filter 16) is connected to the second port 122, and one port of the first heat exchanger 14 (the port away from the economizer 15) is connected to the third port 123. The inlet of the first channel 181 of the third heat exchanger 18 is connected to the first expansion valve 183, the outlet of the first channel 181 is connected between the gas-liquid separator 13 and the fourth port 124, and the inlet 221 of the first expansion valve 183 is connected between the first flow channel 151 and the second expansion valve 172.

[0047] The refrigerant system 2 in this embodiment further includes a circulating pump 24 and an expansion tank 23. The circulating pump 24 is located between the inlet of the heat exchange module 21 and the outlet of the second channel 182. The expansion tank 23 is connected in parallel with the heat exchange module 21 and the circulating pump 24. The refrigerant system 2 may also include an electric radiator 25 and a control valve 22. In this embodiment, the electric radiator 25 is a coil-type radiator. The electric radiator 25 is connected in parallel with the second channel 182. The control valve 22 is used to control the flow of refrigerant flowing out of the heat exchange module 21 to the second channel 182 or to the electric radiator 25. Specifically, in this embodiment, the control valve 22 is an electric three-way valve, including an inlet 221 and two outlets, namely a first outlet 222 and a second outlet 223. The inlet 221 is connected to the outlet of the heat exchange module 21, the first outlet 222 is connected to the inlet of the second channel 182, and the second outlet 223 is connected to the inlet of the electric radiator 25. The outlet of the electric drive radiator 25 is connected between the inlet of the circulating pump 24 and the outlet of the second channel 182. The purpose of the third heat exchanger 18 is twofold: firstly, to recover and utilize heat from the electric drive system to increase the temperature of the refrigerant flowing back to the compressor 11, i.e., to increase the refrigerant temperature at the compressor 11 inlet, thereby reducing the compression rate of the compressor 11, increasing its energy efficiency ratio, and ultimately reducing energy consumption, while also enhancing the heating effect of the compressor 11. Secondly, while recovering and reusing heat from the electric drive system, it also achieves heat dissipation for the electric drive system, organically combining the two systems and reducing the overall size and weight of the machine. The electric drive radiator 25 is provided to cool the electric drive system when the third heat exchanger 18 cannot meet its cooling requirements. The flow direction of the refrigerant can be flexibly adjusted via the control valve 22 to provide different heat dissipation methods for the electric drive system. The outlet of the expansion tank 23 is connected between the outlet of the second channel 182 and the inlet of the circulating pump 24, and the inlet of the expansion tank 23 is connected between the inlet of the second channel 182 and the outlet of the heat exchange module 21. The expansion tank 23 is connected in parallel with the heat exchange module 21 and the circulating pump 24, and can replenish the refrigerant system 2 before the circulating pump 24 discharges water, and can also play a role in venting after the heat exchange module 21 discharges water.

[0048] The first heat exchanger 14 is installed in an indoor environment, and the second heat exchanger 17 is installed in an outdoor environment. In this embodiment, the second heat exchanger 17 and the electric drive radiator 25 are integrated and operate independently without interference. An indoor fan 141 is provided at the first heat exchanger 14 to increase the airflow speed at the first heat exchanger 14. An outdoor fan 171 is provided at the electric drive radiator 25 and the second heat exchanger 17 to increase the airflow speed at the second heat exchanger 17 and the electric drive radiator 25. The integration of the second heat exchanger 17 and the electric drive radiator 25 with the shared outdoor fan 171 further reduces the number of components, decreases the overall size of the machine, and lowers the equipment investment cost.

[0049] The enthalpy-increasing air conditioning system of this embodiment can both cool and heat, including cooling and heating modes. In heating mode, firstly, the first port 121 and the third port 123 of the four-way reversing valve 12 are connected, and the second port 122 and the fourth port 124 are connected. Low-temperature, low-pressure gaseous refrigerant is compressed into high-temperature, high-pressure vapor (or gaseous refrigerant) by the compressor 11. After passing through the first port 121 and the third port 123 of the four-way reversing valve 12, it enters the first heat exchanger 14. Through forced convection by the indoor fan 141, it exchanges heat with the indoor air. The indoor air absorbs heat and rises in temperature, while the refrigerant releases heat and condenses into a medium-temperature, high-pressure liquid refrigerant. This liquid refrigerant enters the first flow channel 151 of the economizer 15 and exchanges heat with the refrigerant after the third expansion valve 153 (the refrigerant in the second flow channel 152) for further cooling (subcooling). Figure 2As shown, at this time, the refrigerant can be divided into three paths. The refrigerant in the first path is throttled by the second expansion valve 172 into a low-temperature, low-pressure liquid refrigerant (or a gas-liquid mixture), and enters the second heat exchanger 17 through the dryer filter 16. The refrigerant in the second heat exchanger 17 exchanges heat with the outdoor air through the forced convection of the outdoor fan 171. After absorbing heat and evaporating, it forms a low-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant passes through the second port 122 and the fourth port 124 and then arrives at the inlet of the gas-liquid separator 13. After mixing with the refrigerant in the second path, it enters the gas-liquid separator 13 together and then returns to the compressor 11. The refrigerant in the second branch is throttled by the first expansion valve 183 into a low-temperature, low-pressure liquid refrigerant (or a gas-liquid mixture). It then enters the first channel 181 of the third heat exchanger 18, absorbs heat from the refrigerant, evaporates into a low-temperature, low-pressure gaseous refrigerant, and directly reaches the inlet of the gas-liquid separator 13. There, it mixes with the refrigerant from the first branch and enters the gas-liquid separator 13 together before returning to the compressor 11. The refrigerant in the third branch is throttled by the third expansion valve 153 into a low-temperature, low-pressure liquid refrigerant (or a gas-liquid mixture). It enters the second flow channel 152 of the economizer 15, absorbs heat from the refrigerant in the first flow channel 151, evaporates into a low-temperature, low-pressure gaseous refrigerant, and directly enters the enthalpy-increasing port of the compressor 11, completing one heating cycle. In this embodiment, during heating, the second expansion valve 172 and the third expansion valve 153 are always open, while the first expansion valve 183 is selectively opened or closed depending on the specific situation. When the first expansion valve 183 is closed, the refrigerant after passing through the first flow channel 151 of the economizer 15 is divided into two paths and flows back to the compressor 11 (e.g., ...). Figure 4 (As shown).

[0050] like Figure 5 As shown, in the cooling mode of the enthalpy-increasing air conditioning system of this embodiment, firstly, the first expansion valve 183 and the third expansion valve 153 are closed, and the first port 121 and the second port 122 of the four-way reversing valve 12 are connected, and the third port 123 and the fourth port 124 are connected. The low-temperature, low-pressure gaseous refrigerant is compressed into high-temperature, high-pressure vapor by the compressor 11, and enters the second heat exchanger 17 after passing through the first port 121 and the second port 122 of the four-way reversing valve 12. It exchanges heat with the outdoor air through the forced convection of the outdoor fan 171. After releasing heat, the refrigerant condenses into a medium-temperature, high-pressure liquid refrigerant. After passing through the dryer filter 16, it is throttled by the second expansion valve 172 and enters the first flow channel 151 of the economizer 15. Then it enters the first heat exchanger 14. The refrigerant in the first heat exchanger 14 exchanges heat with the indoor air through the forced convection of the indoor fan 141. After absorbing heat and evaporating, it forms a low-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant enters the gas-liquid separator 13 through the third port 123 and the fourth port 124 and then returns to the compressor 11, completing one refrigeration cycle.

[0051] like Figure 1 As shown. To improve the automation level of the enthalpy-increasing air conditioning system in this embodiment, the enthalpy-increasing air conditioning system may further include a water temperature detection device 26 and a room temperature detection device (not shown). The water temperature detection device 26 is used to detect the outlet water temperature of the heat exchange module 21, and the room temperature detection device is used to detect the indoor ambient temperature where the first heat exchanger 14 is located. The water temperature detection device 26 and the room temperature detection device can be temperature sensors, respectively. The water temperature detection device 26 can be located between the outlet of the heat exchange module 21 and the inlet of the control valve 22, and the room temperature detection device can be located near the first heat exchanger 14.

[0052] This application also provides an electric vehicle, including the enthalpy-enhancing air conditioning system described above.

[0053] This application also provides a control method for an enthalpy-increasing air conditioning system, which is applied to the aforementioned enthalpy-increasing air conditioning system.

[0054] Specifically, when the controller puts the enthalpy-increasing air conditioning system into heating mode, the enthalpy-increasing air conditioning system enters standby mode and performs the following steps:

[0055] S11. Set the indoor preset temperature T10 and the preset outlet water temperature T13 of the heat exchange module 21 respectively, and execute steps S12 and S14 respectively.

[0056] S12. Real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is true. If yes, start heat pump system 1; otherwise, shut down heat pump system 1.

[0057] Proceed to step S13.

[0058] S13. Repeat step S12 until the enthalpy-increasing air conditioning system exits the heating mode;

[0059] S14. Real-time monitoring of the actual outlet water temperature T12 of heat exchange module 21 to determine whether T12≤T13 is true.

[0060] If yes, determine whether heat pump system 1 is turned on. If yes, control the refrigerant to flow into the second channel 182 and open the first expansion valve 183. If no, keep the current state unchanged.

[0061] If not, then control the refrigerant to prevent it from flowing into the second channel 182;

[0062] Proceed to step S15;

[0063] S15. Repeat step S14 until the enthalpy-increasing air conditioning system exits the heating mode.

[0064] Specifically, this embodiment uses an enthalpy-increasing air conditioning system including a control valve 22 and an electric radiator 25 as an example for explanation. When the enthalpy-increasing air conditioning system does not include the control valve 22 and the electric radiator 25, no corresponding control adjustment is required, and other control methods remain unchanged. Figure 6 As shown, after the controller puts the enthalpy-increasing air conditioning system into heating mode, the system enters standby mode and performs the following steps:

[0065] S11. Set the indoor preset temperature T10 and the preset outlet water temperature T13 of the heat exchange module 21 respectively, and execute steps S12 and S14 respectively.

[0066] The indoor preset temperature T10 can be set as needed; the preset outlet water temperature T13 of the heat exchange module 2121 can also be set as needed, for example, the preset outlet water temperature T13 of the heat exchange module 2121 can be set to 30℃.

[0067] S12. Real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is true. If yes, start heat pump system 1; otherwise, shut down heat pump system 1.

[0068] Proceed to step S13.

[0069] The purpose of this step is to determine whether the actual indoor temperature T11 is lower than the preset indoor temperature T10. If it is lower than the preset indoor temperature T10, the indoor temperature needs to be heated. If it is not lower than the preset indoor temperature T10, the indoor temperature does not need to be heated. When the controller does not control the enthalpy-increasing air conditioning system to exit the heating mode, it will remain in the current standby state.

[0070] S13. Repeat step S12 until the enthalpy-increasing air conditioning system exits the heating mode.

[0071] The purpose of this step is to monitor the actual indoor temperature T11 in real time. As long as the enthalpy-increasing air conditioning system is in heating mode, it will continuously monitor the actual indoor temperature T11. It will heat up as long as the temperature is below T10, and stop heating if the temperature is not below T10. After the enthalpy-increasing air conditioning system exits the heating mode, step S12 will also stop. The enthalpy-increasing air conditioning system will exit the standby mode and will no longer monitor the real-time indoor temperature T11.

[0072] S14. Real-time monitoring of the actual outlet water temperature T12 of heat exchange module 21 to determine whether T12≤T13 is true.

[0073] If yes, then determine whether heat pump system 1 is turned on. If yes, control the refrigerant to flow into the second channel 182, and turn on the first expansion valve 183 and the circulation pump 24. If no, maintain the current state. The refrigerant and refrigerant flow direction at this time are as follows: Figure 3 As shown;

[0074] If not, control the refrigerant flow into the electric drive radiator 25, turn on the outdoor fan 171 and the circulation pump 24, and close the first expansion valve 183; at this time, the refrigerant and the refrigerant flow direction are as follows: Figure 4 As shown.

[0075] Proceed to step S15.

[0076] The purpose of this step is to open the first expansion valve 183 when the actual outlet water temperature T12 of the heat exchange module 21 is lower than the preset outlet water temperature T13, allowing the refrigerant to pass through the third heat exchanger 18 and exchange heat with the heat transfer fluid, thereby lowering the temperature of the electric drive system and recovering the heat from the electric drive system to the heat pump system 1. If the actual outlet water temperature T12 is not lower than the preset outlet water temperature T13, the electric drive radiator 25 can dissipate heat. In this case, it can be assumed that the heat exchange capacity of the third heat exchanger 18 is insufficient to meet the heat dissipation requirements of the electric drive system, and the first expansion valve 183 needs to be closed so that the refrigerant does not pass through the third heat exchanger 18, and the heat transfer fluid also does not pass through the third heat exchanger 18, but flows into the electric drive radiator 25. The heat transfer fluid exchanges heat with the outdoor air through the electric drive radiator 25, thus lowering the temperature. Meanwhile, the waste heat of the electric drive system is only recovered through the third heat exchanger 18 when the heat pump system 1 is turned on (heating). Therefore, when the heat pump system 1 of the enthalpy-increasing air conditioning system is turned off, there is no need to start the first expansion valve 183, and the refrigerant does not flow at this time.

[0077] S15. Repeat step S14 until the enthalpy-increasing air conditioning system exits the heating mode.

[0078] The purpose of this step is to monitor the actual outlet water temperature T12 of the heat exchange module 21 in real time. As long as the enthalpy-increasing air conditioning system is still in heating mode, the actual outlet water temperature T12 of the heat exchange module 21 will be continuously monitored. If it is higher than T13, the refrigerant will be dissipated through the electric drive radiator 25. If it is not higher than T13, there are two situations. If the system is still in heating mode, the refrigerant will be dissipated through the third heat exchanger 18. If the system is not in heating mode (standby mode), the current state will be maintained without adjustment. When the enthalpy-increasing air conditioning system exits the heating mode, step S14 will also stop.

[0079] like Figure 7 As shown, after the controller puts the enthalpy-increasing air conditioning system into cooling mode, the enthalpy-increasing air conditioning system enters standby mode, closes the first expansion valve 183 and the third expansion valve 153, and performs the following steps:

[0080] S21. Set the indoor preset temperature T20 and the preset outlet water temperature T23 of the heat exchange module 21 respectively, and execute steps S22 and S24 respectively.

[0081] The indoor preset temperature T20 can be set as needed, and the preset outlet water temperature T23 of the heat exchange module 21 can also be specifically set as needed. For example, the preset outlet water temperature T23 of the heat exchange module 21 can be set to 30°C.

[0082] S22. Start the indoor fan 141 of the first heat exchanger 14. The indoor fan 141 operates in the ventilation mode, and the actual indoor temperature T21 is detected in real time. Then, it is judged whether T20 < T21 holds. If so, start the refrigerant circulation circuit; if not, close the refrigerant circulation circuit;

[0083] Jump to step S23.

[0084] The purpose of this step is to judge whether the actual indoor temperature T21 is higher than the indoor preset temperature T20. If it is higher than the indoor preset temperature T20, the indoor needs to be cooled. If it is not higher than the indoor preset temperature T20, there is no need to cool the indoor, and the standby state is maintained.

[0085] S23. Repeat step S22 until the vehicle-mounted air conditioner exits the cooling mode.

[0086] The purpose of this step is to monitor the actual indoor temperature T21 in real time. As long as the heat pump air conditioning system is still in the cooling mode, the actual indoor temperature T21 is continuously detected. If it is higher than T20, cooling is performed; if it is not higher than T20, cooling is stopped. When the heat pump air conditioning system exits the cooling mode, step S22 also stops, and the actual indoor temperature T21 is no longer monitored in real time.

[0087] S24. Detect the actual outlet water temperature T22 of the heat exchange module 21 in real time, and judge whether T22 > T23 holds. If so, control the opening of the inlet 221 and the second outlet 223 of the control valve 22, control the closing of the first outlet 222 of the control valve 22, start the outdoor fan 171 and the circulation pump 24 of the electric drive radiator 25, so that the coolant does not flow into the second channel 182, but flows into the electric drive radiator 25, and the outdoor fan 171 cools the electric drive radiator 25. If not, keep the current state unchanged and no adjustment is required.

[0088] Jump to step S25.

[0089] The purpose of this step is to detect the actual outlet water temperature T22 of the heat exchange module 21 in the cooling mode. If the detection result is higher than the preset outlet water temperature T23 of the heat exchange module 21, it is necessary to dissipate heat through the electric drive radiator 25. At this time, the waste heat recovery component and the economizer 15 do not work for enthalpy increase. When the actual outlet water temperature T22 of the heat exchange module 21 is not higher than the preset outlet water temperature T23 of the heat exchange module 21, there is no need to dissipate heat from the electric drive system, and the current state can be kept unchanged.

[0090] S25. Repeat step S24 until the electric drive system is shut down.

[0091] This step involves real-time monitoring of the actual outlet water temperature T22 of the heat exchange module 21. As long as the electric drive system of the enthalpy-increasing air conditioning system is still in operation, the actual outlet water temperature T22 of the heat exchange module 21 will be continuously monitored. If it is higher than T23, the refrigerant will be dissipated through the electric drive radiator 25. If it is not higher than T23, the current state will be maintained without adjustment. When the electric drive system is turned off, step S24 will also stop.

[0092] The flow direction of refrigerant and coolant in enthalpy-increasing air conditioning systems in cooling mode is as follows: Figure 5 As shown.

[0093] In some embodiments, the enthalpy-increasing air conditioning system may also include a ventilation mode. When the enthalpy-increasing air conditioning system is in ventilation mode, only the indoor fan 141 is turned on, the heat pump system 1 is not started, and steps S24 and S25 are executed for the heat dissipation of the electric drive system.

[0094] When the enthalpy-increasing air conditioning system is in cooling or ventilation mode, the heat pump system 1 and the refrigerant system 2 work independently. At this time, heat recovery of the electric drive system is not required, but the heat dissipation of the electric drive system can still be carried out normally.

[0095] It is understood that the vehicle air conditioner with integrated waste heat recovery function provided in this application embodiment also includes a controller. The controller stores control instructions. When the control instructions are executed by the controller, the above control method can be realized. That is, the vehicle air conditioner can be controlled to operate according to the above control method through the controller.

[0096] As can be seen from the above, the enthalpy-increasing air conditioning system, electric vehicle, and control method of the enthalpy-increasing air conditioning system provided in this application embodiment organically combine the heat pump system and the refrigerant system. When the heat pump system is heating, it can fully utilize the heat absorbed from the electric drive system by the refrigerant system, increasing the refrigerant temperature at the compressor inlet, thereby reducing the compressor's compression capacity and effectively improving the compressor's energy efficiency ratio. This broadens the applicable outdoor temperature range of the heat pump system during low-temperature heating. Simultaneously, while absorbing heat, it lowers the refrigerant temperature, achieving cooling of the electric drive system and maintaining it at an optimal temperature. This organic combination effectively reduces the overall size and weight of the entire unit, reduces component input, lowers the overall equipment investment cost, and reduces power consumption, effectively reducing energy consumption and extending the electric vehicle's range. At the same time, the functions of the heat pump system and the refrigerant system remain intact, enabling heat dissipation of the electric drive system while heating or cooling the vehicle interior. In summary, this application can effectively improve the problems of large overall size and weight and high energy consumption caused by the inability to organically combine the heat pump system and the refrigerant system in the prior art.

[0097] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0098] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An enthalpy-increasing air conditioning system, characterized in that, Including heat pump systems and refrigerant systems; The heat pump system is used to circulate refrigerant and includes a compressor and a first heat exchanger, an economizer, and a second heat exchanger that are sequentially circulated and connected to the compressor to achieve a heating cycle. It also includes a third heat exchanger and a first expansion valve. The third heat exchanger includes a first channel and a second channel that can exchange heat with each other. One end of the first channel is connected to the inlet of the compressor, and the other end is connected to one end of the first expansion valve. The other end of the first expansion valve is connected between the economizer and the second heat exchanger. The system also includes a third expansion valve. The economizer includes a first flow channel and a second flow channel that can exchange heat with each other. The first flow channel is connected between the first heat exchanger and the second heat exchanger. The inlet of the second flow channel is connected in series with the third expansion valve, and the outlet of the second flow channel is connected to the enthalpy-increasing port of the compressor. The inlet of the third expansion valve is connected between the first flow channel and the second heat exchanger. The refrigerant system is used to circulate refrigerant and includes a heat exchange module, an electric drive radiator, and a control valve. The heat exchange module is used to exchange heat with the electric drive system and is connected in series with the second channel. The electric drive radiator is connected in parallel with the second channel, and the control valve is used to control the flow of refrigerant from the heat exchange module to the second channel or to the electric drive radiator. The second heat exchanger and the electric drive radiator are integrated and share an outdoor fan.

2. The enthalpy-increasing air conditioning system as described in claim 1, characterized in that, The heat pump system further includes a four-way reversing valve and a gas-liquid separator. The four-way reversing valve includes a first port, a second port, a third port, and a fourth port. The outlet of the compressor is connected to the first port, the inlet of the compressor is connected to the outlet of the gas-liquid separator, the inlet of the gas-liquid separator is connected to the fourth port and one end of the first channel, one port of the second heat exchanger is connected to the second port, and one port of the first heat exchanger is connected to the third port.

3. The enthalpy-increasing air conditioning system as described in claim 2, characterized in that, The heat pump system further includes a second expansion valve and a drying filter. The first flow channel, the second expansion valve and the drying filter are connected in series between the first heat exchanger and the second heat exchanger. The inlet of the third expansion valve is connected between the first flow channel and the second expansion valve.

4. The enthalpy-increasing air conditioning system as described in claim 1, characterized in that, The refrigerant system also includes a circulating pump and an expansion tank. The circulating pump is located between the inlet of the heat exchange module and the outlet of the second channel, and the expansion tank is connected in parallel with the heat exchange module and the circulating pump.

5. The enthalpy-increasing air conditioning system as described in claim 1, characterized in that, The first heat exchanger is for installation in an indoor environment, and the second heat exchanger is for installation in an outdoor environment; and the second heat exchanger and the electric drive radiator operate independently.

6. The enthalpy-increasing air conditioning system as described in claim 5, characterized in that, It also includes an indoor fan and an outdoor fan, wherein the indoor fan is used to increase the airflow velocity at the first heat exchanger, and the outdoor fan is used to increase the airflow velocity at the second heat exchanger and the electric drive radiator.

7. The enthalpy-increasing air conditioning system as described in claim 6, characterized in that, It also includes a water temperature detection device and a room temperature detection device. The water temperature detection device is used to detect the outlet water temperature of the heat exchange module, and the room temperature detection device is used to detect the indoor ambient temperature where the first heat exchanger is located.

8. An electric vehicle, characterized in that, Including the enthalpy-increasing air conditioning system as described in any one of claims 1 to 7.

9. A control method for an enthalpy-increasing air conditioning system, characterized in that, Applied to the enthalpy-increasing air conditioning system as described in any one of claims 1 to 7, the control method of the enthalpy-increasing air conditioning system, when the enthalpy-increasing air conditioning system is in heating mode, performs the following steps: S11. Set the indoor preset temperature T10 and the preset outlet water temperature T13 of the heat exchange module respectively, and execute steps S12 and S14 respectively. S12. Real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is true. If yes, start the heat pump system; if no, shut down the heat pump system. Proceed to step S13; S13. Repeat step S12 until the enthalpy-increasing air conditioning system exits the heating mode; S14. Real-time monitoring of the actual outlet water temperature T12 of the heat exchange module to determine whether T12≤T13 is true. If yes, determine whether the heat pump system is turned on. If yes, control the refrigerant to flow into the second channel and open the first expansion valve. If no, maintain the current state. If not, then control the refrigerant to prevent it from flowing into the second channel; Proceed to step S15; S15. Repeat step S14 until the enthalpy-increasing air conditioning system exits the heating mode.

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