Vehicle-mounted air conditioner integrated with waste heat recovery function, control method and electric vehicle

Abstract

The invention provides a vehicle-mounted air conditioner integrated with a waste heat recovery function, a control method and an electric vehicle, and the vehicle-mounted air conditioner integrated with the waste heat recovery function comprises a refrigerant circulation loop, a secondary refrigerant circulation system and a waste heat recovery assembly. The refrigerant circulation loop comprises a compressor, a first heat exchanger and a second heat exchanger which communicate with one another so as to achieve heating circulation. The secondary refrigerant circulation system comprises a heat exchange module used for exchanging heat with the electric drive system. The waste heat recovery assembly comprises a third heat exchanger and a first throttling element. The third heat exchanger comprises a first channel and a second channel. One end of the first throttling element is connected between the first heat exchanger and the second heat exchanger, the other end of the first throttling element is connected with one end of the first channel, and the other end of the first channel is connected to an inlet of the compressor. The heat exchange module is connected with the second channel in series. According to the vehicle-mounted air conditioner integrated with the waste heat recovery function, the control method and the electric vehicle, the overall occupied space and weight of the vehicle-mounted air conditioner can be reduced, and energy consumption is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of temperature control equipment, and in particular to a vehicle air conditioner with integrated waste heat recovery function, a control method and an electric vehicle. Background Art

[0002] At present, the thermal management and air conditioning systems of electric vehicles are achieved by circulating refrigerant through compressors, four-way reversing valves, outdoor heat exchangers, outdoor fans, throttle valves, indoor heat exchangers, indoor fans, etc. to cool and heat the vehicle body, while the vehicle electric drive system circulates coolant through water pumps, water tanks, heat exchangers, fans, etc. to cool the electric drive system, and the two systems operate independently. In the process of implementing this application, the inventors found that there are at least the following problems in the prior art: the two systems that are independently set up and run will occupy a large space in the vehicle, and will also increase the overall weight of the vehicle body, and the energy consumption is also relatively serious. In addition, when the outdoor temperature is low in winter, the heating effect of the air conditioning system is poor, and the heat generated by the electric drive system cannot be used for heating in the car, and electric auxiliary heating will be used to increase the temperature, which will cause a significant increase in power consumption. Summary of the invention

[0003] Based on this, the present application provides a vehicle air conditioner, a control method and an electric vehicle with integrated waste heat recovery function to improve the problems of large occupied space, large weight and high energy consumption in the prior art.

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

[0005] In a first aspect, an embodiment of the present application provides a vehicle air conditioner with integrated waste heat recovery function, including a refrigerant circulation loop, a coolant circulation system and a waste heat recovery component;

[0006] The refrigerant circulation circuit is used to circulate refrigerant, and includes a compressor, a first heat exchanger and a second heat exchanger that are cyclically connected to realize a heating cycle;

[0007] The coolant circulation system is used to circulate the coolant, and includes a heat exchange module, and the heat exchange module is used to exchange heat with the electric drive system;

[0008] The waste heat recovery component includes a third heat exchanger and a first throttling element, the third heat exchanger includes a first channel and a second channel for exchanging heat with each other; one end of the first throttling element is connected between the first heat exchanger and the second heat exchanger, the other end of the first throttling element is connected to one end of the first channel, and the other end of the first channel is connected to the inlet of the compressor; the heat exchange module is connected in series with the second channel.

[0009] In one embodiment, the refrigerant circulation circuit includes the first heat exchanger, the second throttling element, the drying filter and the second heat exchanger connected in series in sequence; it also includes a gas-liquid separator and a four-way reversing valve, the four-way reversing valve includes a first interface, a second interface, a third interface and a fourth interface; the outlet of the compressor is connected to the first interface, 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 interface; one end of the second heat exchanger is connected to the drying filter, and the other end is connected to the second interface; one end of the first heat exchanger is connected to one end of the second throttling element, and the other end is connected to the third interface; the other end of the second throttling element is connected to the drying filter;

[0010] One end of the third heat exchanger away from the first throttling element is connected between the gas-liquid separator and the fourth interface; one end of the first throttling element away from the third heat exchanger is connected between the first heat exchanger and the second throttling element.

[0011] In one embodiment, a circulation pump is connected in series between the outlet of the second channel and the inlet of the heat exchange module; the refrigerant circulation system also includes an expansion water tank, the outlet of the expansion water tank is connected between the outlet of the second channel and the inlet of the circulation pump, and the inlet of the expansion water tank is connected between the inlet of the second channel and the outlet of the heat exchange module.

[0012] In one embodiment, the coolant circulation system also includes an electric drive radiator and a control valve, the control valve includes an inlet, a first outlet and a second outlet, the inlet is connected to the outlet of the heat exchange module, the first outlet is connected to the inlet of the second channel, the second outlet is connected to the inlet of the electric drive radiator, and the outlet of the electric drive radiator is connected between the inlet of the circulation pump and the outlet of the second channel.

[0013] In one embodiment, the first heat exchanger is used to be arranged indoors, and the second heat exchanger is used to be arranged outdoors. The second heat exchanger and the electric drive radiator are integrated and operate independently.

[0014] In one of the embodiments, the vehicle air conditioner with integrated waste heat recovery function further includes an outdoor fan, and the outdoor fan can be used to dissipate heat for the second heat exchanger and the electric drive radiator at the same time.

[0015] In one of the embodiments, the vehicle air conditioner with integrated waste heat recovery function also includes a water temperature detection device and an indoor temperature detection device, the water temperature detection device is used to detect the outlet water temperature of the heat exchange module, and the indoor temperature detection device is used to detect the indoor ambient temperature.

[0016] In a second aspect, an embodiment of the present application provides a control method for a vehicle air conditioner, which is used for the vehicle air conditioner with integrated waste heat recovery function as described above, wherein a circulating pump is connected in series between the outlet of the second channel and the inlet of the heat exchange module; the coolant circulation system also includes an electric drive radiator and a control valve, the control valve includes an inlet, a first outlet, and a second outlet, the inlet is connected to the outlet of the heat exchange module, the first outlet is connected to the inlet of the second channel, the second outlet is connected to the inlet of the electric drive radiator, the outlet of the electric drive radiator is connected between the inlet of the circulating pump and the outlet of the second channel, and an outdoor fan is provided on one side of the electric drive radiator;

[0017] The first heat exchanger is arranged indoors, the second heat exchanger is arranged outdoors, the vehicle air conditioner is provided with a heating mode, and the control method of the vehicle air conditioner enables the vehicle air conditioner to enter a standby state in the heating mode, and performs the following steps:

[0018] S11, respectively setting the indoor preset temperature T10 and the preset water outlet temperature T13 of the heat exchange module, and executing steps S12 and S14 respectively;

[0019] S12, real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is established, if so, starting the refrigerant circulation loop; if not, closing the refrigerant circulation loop;

[0020] Jump to step S13;

[0021] S13, repeating step S12 until the vehicle air conditioner exits the heating mode;

[0022] S14, real-time detection of the actual outlet water temperature T12 of the heat exchange module is performed to determine whether T12>T13 is established. If so, the inlet and the second outlet of the control valve are controlled to be opened, the first outlet of the control valve is controlled to be closed, the outdoor fan and the circulation pump are turned on, and the first throttling element is turned off; if not, it is determined whether the refrigerant circulation loop is turned on. If so, the inlet and the first outlet of the control valve are controlled to be opened, the second outlet of the control valve is controlled to be closed, the circulation pump is turned on, and the first throttling element is turned on; if not, the current state is kept unchanged;

[0023] Jump to step S15;

[0024] S15, repeat step S14 until the vehicle air conditioner exits the heating mode

[0025] In one embodiment, the vehicle air conditioner is provided with a cooling mode, and the control method of the vehicle air conditioner enables the vehicle air conditioner to enter a standby state in the cooling mode, and performs the following steps:

[0026] S21. Set the indoor preset temperature T20 and the preset water outlet temperature T23 of the heat exchange module respectively, and execute steps S22 and S24 respectively;

[0027] S22. Turn on the indoor fan of the first heat exchanger, detect the actual indoor temperature T21 in real time, and determine whether T20 < T21 holds. If so, start the refrigerant circulation circuit; if not, close the refrigerant circulation circuit;

[0028] Jump to step S23;

[0029] S23. Repeat step S22 until the vehicle-mounted air conditioner exits the refrigeration mode;

[0030] S24. Detect the actual water outlet temperature T22 of the heat exchange module in real time, and determine whether T22 > T23 holds. If so, control the opening of the inlet and the second outlet of the control valve, control the closing of the first outlet of the control valve, turn on the outdoor fan and the circulation pump, and at the same time close the first throttling element; if not, keep the current state unchanged;

[0031] Jump to step S25;

[0032] S25. Repeat step S24 until the electric drive system is turned off.

[0033] In a third aspect, an embodiment of the present application provides an electric vehicle, including the vehicle-mounted air conditioner with the integrated waste heat recovery function as described above.

[0034] The present application has at least the following beneficial effects: On the basis of the original refrigerant circulation circuit, the present application adds a waste heat recovery component. Two channels (the first channel and the second channel) of the heat exchange module of the waste heat recovery component are respectively used for circulating the refrigerant and the secondary refrigerant. After the refrigerant in the refrigerant circulation circuit is throttled and cooled by the first throttling element, it can exchange heat with the secondary refrigerant and absorb the heat of the secondary refrigerant. In this way, the temperature of the refrigerant at the compressor inlet can be increased, thereby reducing the compression amount of the compressor, improving the energy efficiency ratio of the compressor, further reducing energy consumption, and at the same time reducing the heat of the electric drive system, enabling an organic combination of the refrigerant circulation circuit and the secondary refrigerant circulation system, reducing the occupied space and the overall weight of the entire system, and improving the endurance of the electric vehicle.

[0035] In summary, the present application can effectively improve the problems of large occupied space, large weight, and large energy consumption existing in the prior art. Description of the Drawings

[0036] Figure 1It is a schematic diagram of the structure of the vehicle air conditioner with integrated waste heat recovery function in an embodiment of the present application (a schematic diagram of the flow direction of the refrigerant and the coolant in the heating mode T12≤T13).

[0037] Figure 2 This is a schematic diagram of the flow of refrigerant and coolant in a vehicle air conditioner with integrated waste heat recovery function in cooling mode according to an embodiment of the present application.

[0038] Figure 3 It is an enlarged schematic diagram of the structure of the four-way reversing valve according to an embodiment of the present application.

[0039] Figure 4 Schematic diagram of the control flow of the vehicle air conditioner control method in the heating mode according to an embodiment of the present application.

[0040] Figure 5 Schematic diagram of the control flow of the vehicle air conditioner control method in cooling mode according to an embodiment of the present application.

[0041] The meanings of the symbols in the accompanying drawings are as follows:

[0042] 1. Refrigerant circulation circuit; 11. Compressor; 12. Four-way reversing valve; 121. First interface; 122. Second interface; 123. Third interface; 124. Fourth interface; 13. Indoor fan; 14. First heat exchanger; 15. Second throttling element; 16. Dry filter; 17. Second heat exchanger; 18. Gas-liquid separator; 19. Pressure sensor;

[0043] 2. Coolant circulation system; 21. Heat exchange module; 22. Control valve; 221. Inlet; 222. First outlet; 223. Second outlet; 23. Expansion water tank; 24. Circulation pump; 25. Electric drive radiator; 26. Outdoor fan; 27. Water temperature detection device;

[0044] 3. Waste heat recovery component; 31. Third heat exchanger; 311. First channel; 312. Second channel; 32. First throttling element. DETAILED DESCRIPTION

[0045] The technical solution of the present application is further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the implementation of this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] See also Figure 1 and Figure 2 The vehicle air conditioner with integrated waste heat recovery function in the embodiment of the present application includes a refrigerant circulation loop 1, a coolant circulation system 2 and a waste heat recovery component 3.

[0050] The refrigerant circulation circuit 1 is used to circulate the refrigerant, and includes a compressor 11, a first heat exchanger 14, and a second heat exchanger 17 that are circulated and connected. The first heat exchanger 14 is arranged indoors (or inside the vehicle, i.e., on the indoor side), and the second heat exchanger 17 is arranged outdoors (or outside the vehicle, i.e., on the outdoor side). In this arrangement, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 11 can flow into the first heat exchanger 14, release heat to the outside and condense in the first heat exchanger 14, so that the indoor air (or gas) is heated up, and the condensed refrigerant can flow into the second heat exchanger 17, absorb heat in the second heat exchanger 17 and evaporate into a low-temperature and low-pressure gaseous refrigerant, and then flow back to the compressor 11 for the next heating cycle.

[0051] The refrigerant circulation system 2 is used for circulating the refrigerant, and includes a heat exchange module 21. The heat exchange module 21 is used for exchanging heat with the electric drive system. The electric drive system includes a motor and an electronic control component that require thermal management.

[0052] The waste heat recovery component 3 includes a third heat exchanger 31 and a first throttling element 32. The third heat exchanger 31 includes a first channel 311 and a second channel 312 for mutual heat exchange; one end of the first throttling element 32 is connected between the first heat exchanger 14 and the second heat exchanger 17, and the other end of the first throttling element 32 is connected to one end of the first channel 311, and the other end of the first channel 311 is connected to the inlet (or intake port) of the compressor 11; the heat exchange module 21 is connected in series with the second channel 312.

[0053] Specifically, in this embodiment, the refrigerant circulation circuit 1 includes a first heat exchanger 14, a second throttling element 15, a drying filter 16 and a second heat exchanger 17 which are connected in series. The refrigerant circulation circuit 1 also includes a gas-liquid separator 18 and a four-way reversing valve 12. Figure 3 As shown, the four-way reversing valve 12 includes a first interface 121, a second interface 122, a third interface 123 and a fourth interface 124. The outlet (or exhaust port) of the compressor 11 is connected to the first interface 121, the inlet of the compressor 11 is connected to the outlet of the gas-liquid separator 18; the inlet of the gas-liquid separator 18 is connected to the fourth interface 124; one end of the second heat exchanger 17 is connected to the drying filter 16, and the other end is connected to the second interface 122; one end of the first heat exchanger 14 is connected to one end of the second throttling element 15, and the other end is connected to the third interface 123, the other end of the second throttling element 15 is connected to the drying filter 16, and one end of the first throttling element 32 is connected between the first heat exchanger 14 and the second throttling element 15. The first heat exchanger 14 and the second heat exchanger 17 of this embodiment are both coil heat exchangers, the first heat exchanger 14 is arranged indoors and equipped with an indoor fan 13, and the second heat exchanger 17 is arranged outdoors and equipped with an outdoor fan 26. The second throttling element 15 may be, for example, an electronic expansion valve. To make the refrigerant circulation loop 1 run more stably and reliably, pressure sensors 19 may be installed at both sides of the inlet and outlet of the compressor 11 to monitor the pressure at the inlet and outlet of the compressor 11. The refrigerant circulation loop 1 is provided with a heating mode and a cooling mode. Figure 1As shown in the figure (the arrows point to the flow direction of the refrigerant or the coolant), when the heating mode is running, first, the first interface 121 and the third interface 123 of the four-way reversing valve 12 are connected, and the second interface 122 and the fourth interface 124 are connected. The low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam (that is, gaseous refrigerant) by the compressor 11, and enters the first heat exchanger 14 after passing through the first interface 121 and the third interface 123 of the four-way reversing valve 12, and is forced convection with the indoor fan 13. The refrigerant releases heat and condenses into medium-temperature and high-pressure liquid refrigerant. After being throttled by the second throttling element 15, it enters the second heat exchanger 17 through the drying filter 16. The refrigerant in the second heat exchanger 17 exchanges heat with the outdoor air through the forced convection of the outdoor fan 26, absorbs heat and evaporates to form a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant enters the gas-liquid separator 18 through the second interface 122 and the fourth interface 124 and returns to the compressor 11, completing a heating cycle. Figure 2 As shown in the figure (the arrow in the figure indicates the flow direction of the refrigerant or the coolant), when the cooling mode is running, first, the first interface 121 and the second interface 122 of the four-way reversing valve 12 are connected, and the third interface 123 and the fourth interface 124 are connected. The low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam by the compressor 11, and enters the second heat exchanger 17 after passing through the first interface 121 and the second interface 122 of the four-way reversing valve 12, and exchanges heat with the outdoor air through the forced convection of the outdoor fan 26. The refrigerant releases heat and condenses into medium-temperature and high-pressure liquid refrigerant. After passing through the drying filter 16, it enters the first heat exchanger 14 after throttling by the second throttling element 15. The refrigerant in the first heat exchanger 14 exchanges heat with the indoor air through the forced convection of the indoor fan 13, absorbs heat and evaporates to form a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant enters the gas-liquid separator 18 through the third interface 123 and the fourth interface 124, and then returns to the compressor 11, completing a refrigeration cycle.

[0054] like Figures 1 to 3 As shown, the end of the third heat exchanger 31 of the waste heat recovery component 3 away from the first throttling element 32 is connected between the gas-liquid separator 18 and the fourth interface 124; the end of the first throttling element 32 away from the third heat exchanger 31 is connected between the first heat exchanger 14 and the second throttling element 15. The third heat exchanger 31 in this embodiment is a plate heat exchanger, and the first throttling element 32 can be an electronic expansion valve, for example. The purpose of setting the waste heat recovery component 3 is to recycle the heat of the electric drive system when the vehicle air conditioner is running in the heating mode, so as to increase the temperature of the refrigerant flowing back to the compressor 11, that is, to increase the temperature of the refrigerant at the inlet of the compressor 11, thereby reducing the compression amount of the compressor 11, improving the energy efficiency ratio of the compressor 11, and thus reducing energy consumption. At the same time, it can also reduce the temperature of the electric drive system and keep the electric drive system at a better temperature.

[0055] Specifically, in some embodiments, the brine circulation system 2 further includes a circulation pump 24 and an expansion water tank 23. The circulation pump 24 is connected in series between the outlet of the second channel 312 and the inlet of the heat exchange module 21. The circulation pump 24 is used to provide power for the circulation of the brine. The outlet of the expansion water tank 23 is connected between the outlet of the second channel 312 and the inlet of the circulation pump 24, and the inlet of the expansion water tank 23 is connected between the inlet of the second channel 312 and the outlet of the heat exchange module 21. The expansion water tank 23 is connected in parallel with the heat exchange module 21 and the circulation pump 24, and can replenish the brine circulation system 2 before the circulation pump 24 discharges water, and can also play a role in exhausting gas after the heat exchange module 21 discharges liquid.

[0056] In some embodiments, the coolant circulation system 2 also includes an electric drive radiator 25 and a control valve 22, the control valve 22 includes an inlet 221, 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 312, the second outlet 223 is connected to the inlet of the electric drive radiator 25, and the outlet of the electric drive radiator 25 is connected between the inlet of the circulation pump 24 and the outlet of the second channel 312. The control valve 22 can be, for example, an electrically controlled three-way valve. In this embodiment, by setting a three-way valve, the coolant circulation system 2 can form two heat dissipation circulation loops to meet the different heat dissipation requirements of the electric drive system in different states. When the outlet water temperature of the heat exchange module 21 is low, it means that the heat dissipation demand of the electric drive system is not large. At this time, the inlet 221 and the first outlet 222 of the control valve 22 can be opened, and the second outlet 223 can be closed, that is, the inlet 221 and the first outlet 222 of the control valve 22 are connected, and the second outlet 223 is cut off, so that the coolant enters the second channel 312 of the third heat exchanger 31 to exchange heat with the refrigerant. When the outlet water temperature of the heat exchange module 21 is high, it means that the heat dissipation demand of the electric drive system is large. At this time, the inlet 221 and the second outlet 223 of the control valve 22 can be opened, and the first outlet 222 can be closed, so that the coolant enters the electric drive radiator 25, and exchanges heat with the outdoor air through the forced convection of the outdoor fan 26.

[0057] In some embodiments, the second heat exchanger 17 and the electric drive radiator 25 can also be integrated to reduce their overall volume and reduce the space occupied by the vehicle air conditioner. At the same time, only one set of outdoor fans 26 can be provided for the second heat exchanger 17 and the electric drive radiator 25 to use together, thereby reducing the use of components, further reducing the volume of the whole machine, and reducing the manufacturing cost. It is understandable that the second heat exchanger 17 and the electric drive radiator 25 operate independently, and the outdoor fans 26 can be used to dissipate heat for the second heat exchanger 17 and the electric drive radiator 25 at the same time.

[0058] In order to enhance the degree of automation of the vehicle air conditioner, a water temperature detection device 27 and an indoor temperature detection device may also be provided. The water temperature detection device 27 is used to detect the outlet water temperature of the heat exchange module 21, and the indoor temperature detection device is used to detect the indoor ambient temperature. The water temperature detection device 27 may be, for example, a temperature sensor, which may be connected in series between the outlet of the heat exchange module 21 and the inlet 221 of the control valve 22. The indoor temperature detection device may also be a temperature sensor, which may be provided near the first heat exchanger 14.

[0059] An embodiment of the present application also provides a method for controlling a vehicle air conditioner, which is used for the vehicle air conditioner in the above embodiment. When the vehicle air conditioner is in operation, it includes a heating mode and a cooling mode, and may also include a ventilation mode.

[0060] like Figure 4 As shown, in the heating mode, the vehicle air conditioner of the embodiment of the present application can make full use of the waste heat of the electric drive system. When the controller controls the vehicle air conditioner to enter the heating mode, the vehicle air conditioner enters the standby state and performs the following steps:

[0061] S11. Set the preset indoor temperature T10 and the preset water outlet temperature T13 of the heat exchange module 21 respectively, and execute steps S12 and S14 respectively.

[0062] The preset indoor temperature T10 can be set as required, and the preset outlet water temperature T13 of the heat exchange module 21 can also be set specifically as required. The preset outlet water temperature T13 of the heat exchange module 21 can be set to 30° C., for example.

[0063] S12, the indoor temperature detection device detects the indoor actual temperature T11 in real time, and determines whether T10>T11 is established. If so, the refrigerant circulation loop 1 is started, and the indoor fan 13 and the outdoor fan 26 are turned on; if not, the refrigerant circulation loop 1 is closed;

[0064] Jump to step S13.

[0065] This step is to determine whether the actual indoor temperature T11 is lower than the indoor preset temperature T10. If it is lower than the indoor preset temperature T10, the indoor temperature needs to be heated. If it is not lower than the indoor preset temperature T10, there is no need to heat the indoor temperature and the current standby state is maintained.

[0066] S13. Repeat step S12 until the vehicle air conditioner exits the heating mode.

[0067] This step is to monitor the actual indoor temperature T11 in real time. As long as the car air conditioner is still in the heating mode, the actual indoor temperature T11 will be detected all the time. As long as it is lower than T10, heating will be started, and if it is not lower than T10, heating will be stopped. After the car air conditioner exits the heating mode, step S12 will also stop, and the car air conditioner exits the standby mode, and the real-time monitoring of the indoor temperature T11 will no longer be performed in real time.

[0068] S14, the actual outlet water temperature T12 of the heat exchange module 21 is detected in real time by the water temperature detection device 27, and it is judged whether T12>T13 is established. If so, the inlet 221 and the second outlet 223 of the control valve 22 are controlled to be opened, the first outlet 222 of the control valve 22 is controlled to be closed, the outdoor fan 26 and the circulation pump 24 are turned on, and the first throttling element 32 is turned off; if not, it is judged whether the refrigerant circulation loop 1 is turned on. If so, the inlet 221 and the first outlet 222 of the control valve 22 are controlled to be opened, the second outlet 223 of the control valve 22 is controlled to be closed, the circulation pump 24 is turned on, and the first throttling element 32 is turned on; if not, the current state is kept unchanged;

[0069] Jump to step S15.

[0070] This step, that is, when the actual outlet water temperature T12 of the heat exchange module 21 is lower than the preset outlet water temperature T13, the third heat exchanger 31 can be used to exchange heat for the refrigerant. If the actual outlet water temperature T12 is not lower than the preset outlet water temperature T13, the electric drive radiator 25 needs to be used to dissipate heat for it. At this time, it can be considered that the heat exchange capacity of the third heat exchanger 31 cannot meet the heat dissipation requirements of the electric drive system. At the same time, the waste heat recovery of the electric drive system is only required through the third heat exchanger 31 when the refrigerant circulation loop 1 is turned on (heating). Therefore, when the refrigerant circulation loop 1 of the vehicle air conditioner is turned off, there is no need to start the first throttling element 32, and the refrigerant does not flow at this time. It is understandable that the outdoor fan 26 is arranged on one side of the electric drive radiator 25. It should be noted that the outdoor fan 26 can be directly set on one side of the electric drive radiator 25, or it can be indirectly set on one side of the electric drive radiator 25. For example, the electric drive radiator 25, the second heat exchanger 17, and the outdoor fan 26 are set in sequence, as long as the setting of the outdoor fan 26 can dissipate heat for the second heat exchanger 17 and the electric drive radiator 25 at the same time.

[0071] When the secondary refrigerant exchanges heat through the third heat exchanger 31, the refrigerant is divided into two paths after passing through the first heat exchanger 14. One path is throttled by the first throttling element 32 and then enters the first channel 311 of the third heat exchanger 31, and the other path is throttled by the second throttling element 15 and then enters the dryer filter 16. The two paths of refrigerant converge before the inlet of the gas-liquid separator 18 and then jointly return to the compressor 11. At this time, the secondary refrigerant is provided with circulating power by the circulating pump 24, and the low-temperature secondary refrigerant flowing out of the third heat exchanger 31 is injected into the heat exchange module 21, where it exchanges heat with the electric drive system, absorbs its heat to become a high-temperature secondary refrigerant and then flows out of the heat exchange module 21, and then flows back to the second channel 312 of the third heat exchanger 31 after passing through the control valve 22, exchanges heat with the refrigerant, releases heat and then becomes a low-temperature secondary refrigerant, completing one cycle.

[0072] S15. Repeat step S14 until the vehicle-mounted air conditioner exits the heating mode.

[0073] This step is to monitor the actual outlet temperature T12 of the heat exchange module 21 in real time. As long as the vehicle-mounted air conditioner is still in the heating mode, the actual outlet temperature T12 of the heat exchange module 21 is continuously detected. If it is higher than T13, the secondary refrigerant is dissipated through the electric drive radiator 25. If it is not higher than T13, there are two cases. If the system is in the heating state, the secondary refrigerant is dissipated through the third heat exchanger 31. If the system is not in the heating state, the current state is maintained without adjustment. When the vehicle-mounted air conditioner exits the heating mode, step S14 also stops accordingly.

[0074] As Figure 5 shown, when the controller controls the vehicle-mounted air conditioner to enter the cooling mode, the vehicle-mounted air conditioner enters the standby state and performs the following steps:

[0075] S21. Set the indoor preset temperature T20 and the preset outlet temperature T23 of the heat exchange module 21 respectively, and perform steps S22 and S24 respectively.

[0076] The indoor preset temperature T20 can be set as needed, and the preset outlet temperature T23 of the heat exchange module 21 can also be specifically set as needed. For example, the preset outlet temperature T23 of the heat exchange module 21 can be set to 30 °C.

[0077] S22. Turn on the indoor fan 13 of the first heat exchanger 14. The indoor fan 13 operates in the ventilation mode, and the actual indoor temperature T21 is detected in real time, and it is judged whether T20 < T21 holds. If so, start the refrigerant circulation loop 1; if not, close the refrigerant circulation loop 1;

[0078] Jump to step S23.

[0079] This step is to determine 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 temperature needs to be cooled. If it is not higher than the indoor preset temperature T20, the indoor temperature does not need to be cooled.

[0080] S23. Repeat step S22 until the vehicle air conditioner exits the cooling mode.

[0081] This step is to monitor the actual indoor temperature T21 in real time. As long as the car air conditioner is still in the cooling mode, the actual indoor temperature T21 is always detected. As long as it is higher than T20, cooling is performed, and if it is not higher than T20, cooling is stopped. When the car air conditioner exits the cooling mode, step S22 is also stopped, and the actual indoor temperature T21 is no longer monitored in real time.

[0082] S24, real-time detection of the actual outlet water temperature T22 of the heat exchange module 21 is performed to determine whether T22>T23 is established. If so, the inlet 221 and the second outlet 223 of the control valve 22 are controlled to be opened, the first outlet 222 of the control valve 22 is controlled to be closed, the outdoor fan 26 and the circulation pump 24 are turned on, and the first throttling element 32 is turned off at the same time; if not, the current state is maintained unchanged;

[0083] Jump to step S25.

[0084] This step, that is, in the cooling mode, if the actual water outlet temperature T22 of the heat exchange module 21 is higher than the preset water outlet temperature T23 of the heat exchange module 21, the electric drive radiator 25 dissipates heat for it. At this time, the waste heat recovery component 3 does not work. When the actual water outlet temperature T22 of the heat exchange module 21 is not higher than the preset water outlet temperature T23 of the heat exchange module 21, there is no need to dissipate heat for the electric drive system, and the current state can be kept unchanged.

[0085] S25. Repeat step S24 until the electric drive system is shut down.

[0086] This step is to monitor the actual water outlet temperature T22 of the heat exchange module 21 in real time. As long as the electric drive system is in working condition, the actual water outlet temperature T22 of the heat exchange module 21 is always detected. If it is higher than T23, the coolant is cooled through the electric drive radiator 25. If it is not higher than T23, the current state is maintained without adjustment. When the electric drive system is turned off, step S24 is also stopped.

[0087] When the vehicle air conditioner is in the ventilation mode, only the indoor fan 13 is turned on, and the refrigerant circulation circuit 1 is not started. For the heat dissipation of the electric drive system, steps S24 and S25 are executed.

[0088] It can be understood that the vehicle air conditioner with integrated waste heat recovery function provided in the embodiment of the present application also includes a controller, which stores control instructions. When the control instructions are executed by the controller, the above-mentioned control method can be implemented, that is, the vehicle air conditioner can be controlled by the controller to operate according to the above-mentioned control method.

[0089] An embodiment of the present application also provides an electric vehicle, comprising an on-board air conditioner with integrated waste heat recovery function according to the above embodiment.

[0090] The vehicle air conditioner, control method and electric vehicle with integrated waste heat recovery function provided in the embodiment of the present application integrate the heat dissipation component of the electric drive system into the vehicle air conditioner, and use the waste heat of the electric drive system to improve the energy efficiency ratio of the compressor when the vehicle air conditioner is heated, thereby reducing the energy consumption of the vehicle air conditioner and improving the endurance of the electric vehicle. The thermal management system and the compressor system of the electric drive system are organically combined to make the space of the whole vehicle compact and reduce the space used when the two systems are set up separately. At the same time, the second heat exchanger and the electric drive radiator share an outdoor fan, which reduces the use of components, reduces the overall weight of the vehicle, reduces the equipment investment cost, and consumes less power. The electric drive system of the embodiment of the present application can control the flow direction of the coolant by controlling the control valve to achieve heat dissipation whether it is in a high temperature state or a low temperature state, so that the thermal management system of the compressor system and the electric drive system are organically combined. In summary, the present application can effectively improve the problems of large space occupation, large weight and large energy consumption existing in the prior art.

[0091] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0092] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A vehicle air conditioner with integrated waste heat recovery function, characterized in that: It includes a refrigerant circulation loop, a coolant circulation system and a waste heat recovery component; The refrigerant circulation circuit is used to circulate refrigerant, and includes a compressor, a first heat exchanger and a second heat exchanger that are cyclically connected to realize a heating cycle; The coolant circulation system is used to circulate the coolant, and includes a heat exchange module, and the heat exchange module is used to exchange heat with the electric drive system; The waste heat recovery component includes a third heat exchanger and a first throttling element, the third heat exchanger includes a first channel and a second channel for exchanging heat with each other; one end of the first throttling element is connected between the first heat exchanger and the second heat exchanger, the other end of the first throttling element is connected to one end of the first channel, and the other end of the first channel is connected to the inlet of the compressor; the heat exchange module is connected in series with the second channel.

2. The vehicle air conditioner with integrated waste heat recovery function as claimed in claim 1, characterized in that: The refrigerant circulation circuit comprises the first heat exchanger, the second throttling element, the drying filter and the second heat exchanger connected in series in sequence; further comprises a gas-liquid separator and a four-way reversing valve, wherein the four-way reversing valve comprises a first interface, a second interface, a third interface and a fourth interface; the outlet of the compressor is connected to the first interface, 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 interface; one end of the second heat exchanger is connected to the drying filter, and the other end is connected to the second interface; one end of the first heat exchanger is connected to one end of the second throttling element, and the other end is connected to the third interface; the other end of the second throttling element is connected to the drying filter; One end of the third heat exchanger away from the first throttling element is connected between the gas-liquid separator and the fourth interface; one end of the first throttling element away from the third heat exchanger is connected between the first heat exchanger and the second throttling element.

3. The vehicle air conditioner with integrated waste heat recovery function as claimed in claim 2, characterized in that: A circulating pump is connected in series between the outlet of the second channel and the inlet of the heat exchange module; the refrigerant circulation system also includes an expansion water tank, the outlet of the expansion water tank is connected between the outlet of the second channel and the inlet of the circulating pump, and the inlet of the expansion water tank is connected between the inlet of the second channel and the outlet of the heat exchange module.

4. The vehicle air conditioner with integrated waste heat recovery function as claimed in claim 3, characterized in that: The coolant circulation system also includes an electric drive radiator and a control valve, the control valve includes an inlet, a first outlet and a second outlet, the inlet is connected to the outlet of the heat exchange module, the first outlet is connected to the inlet of the second channel, the second outlet is connected to the inlet of the electric drive radiator, and the outlet of the electric drive radiator is connected between the inlet of the circulation pump and the outlet of the second channel.

5. The vehicle air conditioner with integrated waste heat recovery function as claimed in claim 4, characterized in that: The first heat exchanger is used to be arranged indoors, and the second heat exchanger is used to be arranged outdoors. The second heat exchanger and the electric drive radiator are integrated and operate independently.

6. The vehicle air conditioner with integrated waste heat recovery function as claimed in claim 5, characterized in that: It also includes an outdoor fan, which can be used to dissipate heat for the second heat exchanger and the electric drive radiator at the same time.

7. The vehicle air conditioner with integrated waste heat recovery function as claimed in claim 5, characterized in that: It also includes a water temperature detection device and an indoor temperature detection device, wherein the water temperature detection device is used to detect the outlet water temperature of the heat exchange module, and the indoor temperature detection device is used to detect the indoor ambient temperature.

8. A method for controlling a vehicle air conditioner, characterized in that: Applied to the vehicle-mounted air conditioner with integrated waste heat recovery function as described in any one of claims 1 to 7, a circulation pump is connected in series between the outlet of the second channel and the inlet of the heat exchange module; the coolant circulation system further includes an electric drive radiator and a control valve. The control valve includes an inlet, a first outlet, and a second outlet. The inlet is connected to the outlet of the heat exchange module, the first outlet is connected to the inlet of the second channel, the second outlet is connected to the inlet of the electric drive radiator, and the outlet of the electric drive radiator is connected between the inlet of the circulation pump and the outlet of the second channel. An outdoor fan is arranged on one side of the electric drive radiator; The first heat exchanger is arranged indoors, the second heat exchanger is arranged outdoors, the vehicle-mounted air conditioner has a heating mode, and the control method of the vehicle-mounted air conditioner makes the vehicle-mounted air conditioner enter the standby state in the heating mode and executes 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 detect the indoor actual temperature T11, and judge whether T10>T11 holds. If so, start the refrigerant circulation loop; if not, close the refrigerant circulation loop; Jump to step S13; S13. Repeat step S12 until the vehicle-mounted air conditioner exits the heating mode; S14. Real-time detect the actual outlet water temperature T12 of the heat exchange module, and judge whether T12>T13 holds. If so, control the inlet and the second outlet of the control valve to open, control the first outlet of the control valve to close, turn on the outdoor fan and the circulation pump, and close the first throttling element; if not, judge whether the refrigerant circulation loop is open. If so, control the inlet and the first outlet of the control valve to open, control the second outlet of the control valve to close, turn on the circulation pump, and turn on the first throttling element; if not, keep the current state unchanged; Jump to step S15; S15. Repeat step S14 until the vehicle-mounted air conditioner exits the heating mode.

9. The control method of the vehicle air conditioner according to claim 8, characterized in that: The vehicle-mounted air conditioner has a cooling mode, and the control method of the vehicle-mounted air conditioner makes the vehicle-mounted air conditioner enter the standby state in the cooling mode and executes the following steps: S21. Set the indoor preset temperature T20 and the preset outlet water temperature T23 of the heat exchange module respectively, and execute steps S22 and S24 respectively; S22. Turn on the indoor fan of the first heat exchanger, real-time detect the indoor actual temperature T21, and judge whether T20<T21 holds. If so, start the refrigerant circulation loop; if not, close the refrigerant circulation loop; Jump to step S23; S23. Repeat step S22 until the vehicle-mounted air conditioner exits the cooling mode; S24, real-time detection of the actual outlet water temperature T22 of the heat exchange module is performed to determine whether T22>T23 is established. If so, the inlet and the second outlet of the control valve are controlled to be opened, the first outlet of the control valve is controlled to be closed, the outdoor fan and the circulation pump are turned on, and the first throttling element is turned off at the same time; if not, the current state is kept unchanged; Jump to step S25; S25. Repeat step S24 until the electric drive system is shut down.

10. An electric vehicle, characterized in that: A vehicle air conditioner with integrated waste heat recovery function as claimed in any one of claims 1 to 7.

Images