A hybrid vehicle heat pump air conditioning system

Abstract

The present application relates to a heat pump air conditioning system for a hybrid vehicle, comprising: a heat pump air conditioning circuit, comprising an air conditioning compressor, a first heat exchanger, an in-vehicle condenser, a first electronic expansion valve, an in-vehicle evaporator, and a gas-liquid separator, all interconnected in sequence; and a heater core circuit, connected to an engine cooling circuit via a four-way valve. The heater core circuit comprises a first circulating water pump and a heater core, each interconnected, with a first heat exchanger connected between the first circulating water pump and the heater core. The present application utilizes the interconnected air conditioning compressor, first heat exchanger, in-vehicle condenser, first electronic expansion valve, in-vehicle evaporator, and gas-liquid separator of the heat pump air conditioning circuit to form a direct bypass heat pump air conditioner. After the air conditioning compressor is activated, the refrigerant directly heats the in-vehicle condenser, which directly heats the passenger compartment, accelerating heating of the passenger compartment, reducing heat loss, and lowering air conditioning energy consumption.

Description

Technical Field

[0001] The present application relates to the technical field of plug-in hybrid electric vehicle air-conditioning systems, and in particular to a heat pump air-conditioning system for a hybrid electric vehicle. Background Art

[0002] Plug-in Hybrid Electric Vehicles (PHEVs) are increasingly popular among consumers due to their dual-fuel and long driving range. However, in winter, especially in regions with sub-zero temperatures, pure electric mode requires a PTC heater to heat the battery and passenger compartment, which consumes high energy and significantly reduces driving range.

[0003] Heat pump air conditioners are 2-3 times more energy efficient than PTC thermosensitive air conditioners and can effectively extend the range of PHEVs in pure electric mode. However, heat pumps use air as their heat source, and the heat in air is dispersed and irregularly distributed, which affects the efficiency of the heat pump and slows down heating. If the air temperature is extremely low, the heating efficiency of the heat pump air conditioner is even lower, the heating speed is even slower, and energy consumption increases.

[0004] However, PHEVs are equipped with indirect heat pump air conditioners, which first heat the engine coolant circuit with refrigerant before exchanging heat with the cabin air through a heater core to heat the cabin. In extremely cold environments or when driving in pure electric mode, indirect heat pump air conditioners struggle to quickly heat the engine coolant circuit to provide warmth to the cabin, resulting in slow heating and poor cabin comfort. Summary of the Invention

[0005] The embodiment of the present application provides a hybrid vehicle heat pump air conditioning system to solve the problems of slow heating speed and poor passenger compartment comfort in the indirect heat pump air conditioning model installed in PHEV vehicles in the related art.

[0006] The present invention provides a heat pump air conditioning system for a hybrid vehicle, comprising:

[0007] A heat pump air conditioning circuit, the heat pump air conditioning circuit comprising an air conditioning compressor, a first heat exchanger, an in-vehicle condenser, a first electronic expansion valve, an in-vehicle evaporator, and a gas-liquid separator, which are interconnected in sequence;

[0008] The heater core circuit is connected to the engine cooling circuit through a four-way valve. The heater core circuit includes a first circulating water pump and a heater core that are interconnected. The first heat exchanger is connected between the first circulating water pump and the heater core.

[0009] In some embodiments: further comprising a battery coolant circulation loop, the battery coolant circulation loop comprising a second heat exchanger, a battery pack, and a second circulating water pump that are interconnected;

[0010] The second heat exchanger is connected in series to the warm air core circuit, and a three-way valve for connecting or disconnecting the second heat exchanger is connected in series to the warm air core circuit.

[0011] In some embodiments, the water inlet of the second heat exchanger is connected to the three-way valve, the water outlet of the second heat exchanger is connected to the downstream pipeline of the three-way valve through a three-way pipe, and the three-way valve is connected to the downstream pipeline of the heater core.

[0012] In some embodiments, a first temperature sensor and a second temperature sensor are provided on the battery coolant circulation loop, and the first temperature sensor and the second temperature sensor are respectively connected to the water inlet and the water outlet of the battery pack.

[0013] In some embodiments, the heat pump air conditioning circuit further includes an off-vehicle heat exchanger, the inlet of the off-vehicle heat exchanger is connected to the first electronic expansion valve via a second electronic expansion valve, and the outlet of the off-vehicle heat exchanger is connected to the gas-liquid separator via a first solenoid valve;

[0014] The outlet of the first electronic expansion valve is connected to a first temperature and pressure sensor, the inlet of the in-vehicle evaporator is connected to a third electronic expansion valve, and the inlets of the second and third electronic expansion valves are both connected to the first temperature and pressure sensor.

[0015] In some embodiments: the heat pump air conditioning circuit also includes a battery pack heat exchange branch for exchanging heat for the battery pack, the inlet of the battery pack heat exchange branch is connected to the downstream pipeline of the second electronic expansion valve, the outlet of the battery pack heat exchange branch is connected to the downstream pipeline of the evaporator in the vehicle, and the second solenoid valve and the third heat exchanger are connected in series on the battery pack heat exchange branch.

[0016] In some embodiments: it also includes an indirect heating branch, the inlet of the indirect heating branch is connected to the first heat exchanger, the outlet of the indirect heating branch is connected to the gas-liquid separator, and the indirect heating branch is connected in series with a fourth electronic expansion valve and a third solenoid valve.

[0017] In some embodiments: the heat pump air-conditioning circuit also includes a second temperature and pressure sensor connected to the inlet of the gas-liquid separator, and a third temperature and pressure sensor connected to the outlet of the air-conditioning compressor, a bypass branch is provided between the outlet of the third temperature and pressure sensor and the inlet of the second temperature and pressure sensor, and a fifth electronic expansion valve is connected to the bypass branch.

[0018] In some embodiments: the heat pump air conditioning circuit further includes a one-way valve connected to the pipeline between the in-vehicle evaporator and the second temperature and pressure sensor, and the outlet of the fifth electronic expansion valve is connected to the downstream pipeline of the one-way valve outlet.

[0019] In some embodiments: a third temperature sensor is connected to the heater core circuit, and the third temperature sensor is connected upstream of the heater core.

[0020] The beneficial effects of the technical solution provided by this application include:

[0021] An embodiment of the present application provides a hybrid vehicle heat pump air-conditioning system. Since the hybrid vehicle heat pump air-conditioning system of the present application is provided with a heat pump air-conditioning circuit, the heat pump air-conditioning circuit includes an air-conditioning compressor, a first heat exchanger, an in-vehicle condenser, a first electronic expansion valve, an in-vehicle evaporator, and a gas-liquid separator that are interconnected in sequence; a warm air core circuit, the warm air core circuit is connected to the engine cooling circuit through a four-way valve, the warm air core circuit includes a first circulating water pump and a warm air core that are interconnected, and a first heat exchanger is connected between the first circulating water pump and the warm air core.

[0022] Therefore, the hybrid vehicle heat pump air conditioning system of the present application utilizes a heat pump air conditioning circuit comprising an air conditioning compressor, a first heat exchanger, an in-vehicle condenser, a first electronic expansion valve, an in-vehicle evaporator, and a gas-liquid separator, interconnected to form a direct-bypass heat pump air conditioner. Upon activation, the air conditioning compressor directly heats the in-vehicle condenser via refrigerant, which in turn directly heats the passenger compartment, while the in-vehicle evaporator controls the air temperature within the passenger compartment. This direct-bypass heat pump air conditioner eliminates the intermediate coolant heating process in the heater core circuit, accelerating passenger compartment heating while also minimizing heat loss and lowering air conditioning energy consumption.

[0023] Furthermore, when the coolant in the heater core circuit is heated to a first temperature by the engine, the first circulating water pump is activated, allowing the heat pump air conditioning circuit and the heater core circuit to exchange heat with each other through the first heat exchanger. The passenger compartment is then directly heated by both the vehicle's condenser and the heater core. This accelerates cabin heating, reduces air conditioning compressor power, and lowers energy consumption in the heat pump air conditioning circuit. When the coolant in the heater core circuit is heated to a second temperature by the engine, the heat pump air conditioning circuit is shut down, allowing the heater core alone to directly heat the passenger compartment, further reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 This is a structural block diagram of a heat pump air conditioning system for a hybrid vehicle according to an embodiment of the present application;

[0026] Figure 2 This is a structural diagram of a first working mode of a heat pump air-conditioning system for a hybrid vehicle according to an embodiment of the present application;

[0027] Figure 3 This is a structural diagram of the second working mode of the heat pump air-conditioning system for a hybrid vehicle according to an embodiment of the present application;

[0028] Figure 4 This is a structural diagram of the third working mode of the heat pump air-conditioning system for a hybrid vehicle according to an embodiment of the present application;

[0029] Figure 5 This is a structural diagram of the fourth working mode of the heat pump air-conditioning system for a hybrid vehicle according to an embodiment of the present application;

[0030] Figure 6 This is a structural diagram of the fifth working mode of the heat pump air-conditioning system for a hybrid vehicle according to an embodiment of the present application.

[0031] Reference numerals:

[0032] 10. Heat pump air conditioning circuit; 11. Air conditioning compressor; 12. First heat exchanger; 13. In-vehicle condenser; 14. First electronic expansion valve; 15. In-vehicle evaporator; 16. Gas-liquid separator; 17. External heat exchanger; 18. First solenoid valve; 19. Second electronic expansion valve;

[0033] 20. Third electronic expansion valve; 21. First temperature and pressure sensor; 22. Second solenoid valve; 23. Third heat exchanger; 24. Fourth electronic expansion valve; 25. Third solenoid valve; 26. Second temperature and pressure sensor; 27. Third temperature and pressure sensor; 28. Fifth electronic expansion valve; 29. ​​One-way valve;

[0034] 30. Heater core circuit; 31. Four-way valve; 32. Engine cooling circuit; 33. First circulating water pump; 34. Heater core; 35. Three-way valve; 36. Three-way pipe; 37. Third temperature sensor;

[0035] 40. Battery coolant circulation loop; 41. Second heat exchanger; 42. Battery pack; 43. Second circulating water pump; 44. First temperature sensor; 45. Second temperature sensor. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] The embodiment of the present application provides a hybrid vehicle heat pump air conditioning system, which can solve the problems of slow heating speed and poor passenger compartment comfort of the indirect heat pump air conditioning installed in PHEV vehicles in the related art.

[0038] See also Figures 1 to 3 As shown, the embodiment of the present application provides a hybrid vehicle heat pump air conditioning system, comprising:

[0039] Heat pump air conditioning circuit 10 includes an interconnected compressor 11, a first heat exchanger 12, an in-vehicle condenser 13, a first electronic expansion valve 14, an in-vehicle evaporator 15, and a gas-liquid separator 16. These interconnected components form a direct-bypass heat pump air conditioner. Upon activation, compressor 11 directly heats the in-vehicle condenser 13 via refrigerant, which then directly heats the passenger compartment. The evaporator 15 then maintains the air temperature within the passenger compartment.

[0040] The heater core circuit 30 is connected to the engine cooling circuit 32 via a four-way valve 31. The heater core circuit 30 includes a first circulating water pump 33 and a heater core 34, which are interconnected. The first heat exchanger 12 is connected between the first circulating water pump 33 and the heater core 34. When the coolant in the heater core circuit 30 is heated to a first temperature by the engine, the first circulating water pump 33 is activated, causing the heat pump air conditioning circuit 10 and the heater core circuit 30 to exchange heat with each other through the first heat exchanger 12. The passenger compartment is then directly heated by the in-vehicle condenser 13 and the heater core 34.

[0041] See also Figure 2 As shown, the hybrid vehicle heat pump air conditioning system is in the first operating mode. The refrigerant in the red pipe is flowing, while the refrigerant or coolant in the black pipe is stationary. In the first operating mode, the refrigerant, compressed and heated by the air conditioning compressor 11, flows sequentially through the first heat exchanger 12, the in-vehicle condenser 13, the first electronic expansion valve 14, the in-vehicle evaporator 15, and the gas-liquid separator 16 before returning to the air conditioning compressor 11 and entering the next cycle.

[0042] The low-temperature, low-pressure superheated gas transported from the in-vehicle evaporator 15 enters the gas-liquid separator 16. After the liquid is separated, the dry superheated gas is sucked in and compressed by the air-conditioning compressor 11 to become high-temperature, high-pressure gas and then flows out. The gas enters the in-vehicle condenser 13 through the first heat exchanger 12 to release heat and condense (at this time, the air in the passenger compartment is heated) to become supercooled liquid. The supercooled liquid becomes a low-temperature, low-pressure two-phase fluid after the resistance and pressure reduction of the first electronic expansion valve 14, enters the in-vehicle evaporator 15 to evaporate and absorb heat, and then the superheated gas enters the next cycle through the gas-liquid separator 16.

[0043] See also Figure 3 As shown, the hybrid vehicle heat pump air conditioning system is in the second operating mode, with the refrigerant or coolant in the red pipes flowing and the refrigerant or coolant in the black pipes at rest. In the second operating mode, after the coolant in the heater core circuit 30 is heated to a first temperature by the engine, the first circulating water pump 33 is activated, allowing heat exchange between the heat pump air conditioning circuit 10 and the heater core circuit 30 via the first heat exchanger 12.

[0044] Utilizing both the in-vehicle condenser 13 and the heater core 34 to directly heat the passenger compartment accelerates cabin heating, reduces air conditioning compressor power, and lowers energy consumption within the heat pump air conditioning circuit. Once the engine heats the coolant in the heater core circuit 30 to a second temperature greater than the first, the heat pump air conditioning circuit 10 is shut down, allowing the heater core 34 to directly heat the passenger compartment, further reducing energy consumption.

[0045] The hybrid vehicle heat pump air conditioning system of the present embodiment utilizes a heat pump air conditioning circuit 10, interconnected with an air conditioning compressor 11, a first heat exchanger 12, an in-vehicle condenser 13, a first electronic expansion valve 14, an in-vehicle evaporator 15, and a gas-liquid separator 16, to form a direct bypass heat pump air conditioner. After activation, the air conditioning compressor 11 directly heats the in-vehicle condenser 13 via refrigerant. This in-vehicle condenser 13 directly heats the passenger compartment, while the in-vehicle evaporator 15 regulates the air temperature within the passenger compartment.

[0046] The direct bypass heat pump air conditioner eliminates the intermediate process of heating the coolant in the warm air core circuit 30 . On the one hand, it can speed up the heating speed of the passenger compartment, and on the other hand, it also reduces heat loss and lowers the energy consumption of the air conditioner.

[0047] Furthermore, after the engine heats the coolant in the heater core circuit 30 to a first temperature, the first circulating water pump 33 is activated, allowing the heat pump air conditioning circuit 10 and the heater core circuit 30 to exchange heat with each other through the first heat exchanger 12. Utilizing the in-vehicle condenser 13 and the heater core 34 to directly heat the passenger compartment accelerates passenger compartment heating, reduces the power of the air conditioning compressor 11, and lowers energy consumption in the heat pump air conditioning circuit 10. Once the engine heats the coolant in the heater core circuit 30 to a second temperature, the heat pump air conditioning circuit 10 can be shut down, allowing the heater core 34 to directly heat the passenger compartment, further reducing energy consumption.

[0048] In some alternative embodiments: See Figure 1 、 Figure 3 and Figure 4 As shown, an embodiment of the present application provides a hybrid vehicle heat pump air conditioning system, which also includes a battery coolant circulation loop 40. The battery coolant circulation loop 40 includes a second heat exchanger 41, a battery pack 42, and a second circulating water pump 43, which are interconnected. The second heat exchanger 41 is connected in series to the heater core loop 30, and a three-way valve 35 is connected in series to the heater core loop 30 to connect or disconnect the second heat exchanger 41.

[0049] The water inlet of the second heat exchanger 41 is connected to the three-way valve 35. The water outlet of the second heat exchanger 41 is connected to the downstream pipeline of the three-way valve 35 through a three-way pipe 36. The three-way valve 35 is connected to the downstream pipeline of the heater core 34. The battery coolant circulation loop 40 is equipped with a first temperature sensor 44 and a second temperature sensor 45. The first temperature sensor 44 and the second temperature sensor 45 are respectively connected to the water inlet and outlet of the battery pack 42.

[0050] See also Figure 4 As shown, the hybrid vehicle heat pump air conditioning system is in the third operating mode, with the refrigerant or coolant in the red pipes flowing and the refrigerant or coolant in the black pipes at rest. In the third operating mode, after the coolant in the heater core circuit 30 is heated to a first temperature by the engine, the first circulating water pump 33 is activated, enabling heat exchange between the heat pump air conditioning circuit 10 and the heater core circuit 30 via the first heat exchanger 12.

[0051] Utilizing the in-vehicle condenser 13 and the heater core 34 to directly heat the passenger compartment accelerates cabin heating, reduces air conditioning compressor power, and lowers energy consumption within the heat pump air conditioning circuit. When the engine heats the coolant in the heater core circuit 30 to a second temperature greater than the first, the three-way valve 35 is switched, connecting the heater core circuit 30 to the second heat exchanger 41. The heat pump air conditioning circuit 10 and the heater core circuit 30 then jointly utilize the second heat exchanger 41 to heat the battery coolant circulation circuit 40.

[0052] In some alternative embodiments: See Figures 1 to 6 As shown, an embodiment of the present application provides a hybrid vehicle heat pump air-conditioning system. The heat pump air-conditioning circuit 10 of the hybrid vehicle heat pump air-conditioning system also includes an off-vehicle heat exchanger 17. The inlet of the off-vehicle heat exchanger 17 is connected to the first electronic expansion valve 14 through a second electronic expansion valve 19, and the outlet of the off-vehicle heat exchanger 17 is connected to the gas-liquid separator 16 through a first solenoid valve 18.

[0053] The outlet of the first electronic expansion valve 14 is connected to a first temperature and pressure sensor 21. The inlet of the in-vehicle evaporator 15 is connected to a third electronic expansion valve 20. The inlets of the second and third electronic expansion valves 19 and 20 are both connected to the first temperature and pressure sensor 21. The first temperature and pressure sensor 21 is used to detect the temperature and pressure of the refrigerant downstream of the in-vehicle condenser 13. When the first, second, and third electronic expansion valves 14, 19, and 20 are all closed, the hybrid vehicle heat pump air conditioning system is in the fourth operating mode.

[0054] When the first electronic expansion valve 14 and the second electronic expansion valve 19 are open and the third electronic expansion valve 20 is closed, the hybrid vehicle heat pump air conditioning system is in the fifth operating mode. When the first electronic expansion valve 14 and the third electronic expansion valve 20 are open and the second electronic expansion valve 19 is closed, the hybrid vehicle heat pump air conditioning system is in the first operating mode, the second operating mode, or the third operating mode.

[0055] The first temperature and pressure sensor 21 is not only used to detect the temperature and pressure information of the refrigerant downstream of the vehicle condenser 13, but also serves as an intermediate connector for interconnecting the first electronic expansion valve 14, the second electronic expansion valve 19 and the third electronic expansion valve 20, making the structure of the hybrid vehicle heat pump air-conditioning system simpler, with more working modes and more convenient switching between different working modes.

[0056] When the first electronic expansion valve 14, the first solenoid valve 18, the second electronic expansion valve 19, and the fourth electronic expansion valve 24 are all in the open state, and the third solenoid valve 25 and the third electronic expansion valve 20 are all in the closed state, the hybrid vehicle heat pump air conditioning system is in the fifth working mode. Figure 6 As shown, the heat pump air conditioning system of the hybrid vehicle is in the fifth working mode, the refrigerant or coolant in the red pipe is in a flowing state, and the refrigerant or coolant in the black pipe is in a stationary state.

[0057] In the fifth operating mode, the air conditioning compressor 11, first heat exchanger 12, interior condenser 13, first electronic expansion valve 14, first temperature and pressure sensor 21, second electronic expansion valve 19, exterior heat exchanger 17, first solenoid valve 18, fourth electronic expansion valve 24, and gas-liquid separator 16 are interconnected to form a direct heat pump air conditioner. When the air conditioning compressor 11 is activated, the refrigerant directly heats the interior condenser 13, which in turn heats the passenger compartment. Simultaneously, the exterior heat exchanger 17 transfers heat from the outside air.

[0058] In some alternative embodiments: See Figures 1 to 6 As shown, an embodiment of the present application provides a hybrid vehicle heat pump air conditioning system. The heat pump air conditioning circuit 10 of the hybrid vehicle heat pump air conditioning system also includes a battery pack heat exchange branch for exchanging heat with the battery pack 42. The inlet of the battery pack heat exchange branch is connected to the downstream pipeline of the second electronic expansion valve 19, and the outlet of the battery pack heat exchange branch is connected to the downstream pipeline of the vehicle evaporator 15. The battery pack heat exchange branch is connected in series with the second solenoid valve 22 and the third heat exchanger 23.

[0059] In this embodiment of the present application, a battery pack heat exchange branch is added to the heat pump air conditioning circuit 10 to exchange heat with the battery pack 42. This battery pack heat exchange branch is used to heat the battery coolant circulation circuit 40. A third heat exchanger 23 is connected in series to the battery coolant circulation circuit 40. When the second electronic expansion valve 19 and the second solenoid valve 22 are both open, the refrigerant discharged from the downstream of the vehicle condenser 13 flows through the first electronic expansion valve 14, the first temperature and pressure sensor 21, the second electronic expansion valve 19, the second electronic expansion valve 19, the third heat exchanger 23, and then enters the gas-liquid separator 16.

[0060] In some alternative embodiments: See Figures 1 to 6 As shown, the embodiment of the present application provides a hybrid vehicle heat pump air conditioning system, which also includes an indirect heating branch. The inlet of the indirect heating branch is connected to the first heat exchanger 12, and the outlet of the indirect heating branch is connected to the gas-liquid separator 16. The indirect heating branch is connected in series with a fourth electronic expansion valve 24 and a third solenoid valve 25.

[0061] When the fourth electronic expansion valve 24 and the third solenoid valve 25 are in the open state, and the first electronic expansion valve 14, the second electronic expansion valve 19 and the third electronic expansion valve 20 are all in the closed state, the hybrid vehicle heat pump air conditioning system is in the fourth working mode, see Figure 5 As shown, the heat pump air conditioning system of the hybrid vehicle is in the fourth working mode, the refrigerant or coolant in the red pipe is in a flowing state, and the refrigerant or coolant in the black pipe is in a stationary state.

[0062] In the fourth operating mode, the air conditioning compressor 11, first heat exchanger 12, third solenoid valve 25, fourth electronic expansion valve 24, and gas-liquid separator 16 are interconnected to form an indirect bypass heat pump air conditioner. After the air conditioning compressor 11 is activated, the refrigerant directly heats the coolant in the first heat exchanger 12. Simultaneously, the heater core circuit 30 is connected to the engine cooling circuit 32 via a four-way valve 31. The heater core circuit 30 activates the first circulating water pump 33 and switches the three-way valve 35, allowing heat exchange between the heat pump air conditioning circuit 10 and the heater core circuit 30 via the first heat exchanger 12.

[0063] The coolant in first heat exchanger 12 is heated by the indirect bypass heat pump air conditioning system formed by heat pump air conditioning circuit 10. It then flows through heater core 34, three-way valve 35, second heat exchanger 41, three-way pipe 36, and four-way valve 31 before entering the engine's water jacket for further heating before entering the next cycle. Heater core 34, heated by the coolant, heats the passenger compartment, while second heat exchanger 41, heated by the coolant, heats the battery pack 42.

[0064] In some alternative embodiments: See Figures 1 to 6 As shown, an embodiment of the present application provides a heat pump air conditioning system for a hybrid vehicle. The heat pump air conditioning circuit 10 of the hybrid vehicle heat pump air conditioning system further includes a second temperature and pressure sensor 26 connected to the inlet of the gas-liquid separator 16, and a third temperature and pressure sensor 27 connected to the outlet of the air conditioning compressor 11. A bypass branch is provided between the outlet of the third temperature and pressure sensor 27 and the inlet of the second temperature and pressure sensor 26, and a fifth electronic expansion valve 28 is connected to the bypass branch.

[0065] The third temperature and pressure sensor 27 is used to detect the refrigerant pressure and temperature at the outlet of the air conditioning compressor 11, and the second temperature and pressure sensor 26 is used to detect the refrigerant pressure and temperature at the inlet of the air conditioning compressor 11. The air conditioning compressor 11 adjusts its power based on the difference in refrigerant pressure and temperature at its inlet or outlet. A bypass branch is provided between the outlet of the third temperature and pressure sensor 27 and the inlet of the second temperature and pressure sensor 26. A fifth electronic expansion valve 28 is connected to this bypass branch and is used to adjust the power of the air conditioning compressor 11.

[0066] In some alternative embodiments: See Figures 1 to 6 As shown, the embodiment of the present application provides a hybrid vehicle heat pump air conditioning system. The heat pump air conditioning circuit 10 of the hybrid vehicle heat pump air conditioning system further includes a one-way valve 29 connected to the pipeline between the vehicle evaporator 15 and the second temperature and pressure sensor 26. The outlet of the fifth electronic expansion valve 28 is connected to the pipeline downstream of the outlet of the one-way valve 29. The one-way valve 29 is used to direct the refrigerant flowing out of the vehicle evaporator 15 into the second temperature and pressure sensor 26 in a one-way direction.

[0067] A third temperature sensor 37 is connected to the warm air core circuit 30, and the third temperature sensor 37 is connected upstream of the warm air core 34. The third temperature sensor 37 is used to monitor the temperature information of the coolant on the warm air core circuit 30, and adjust the speed of the first circulating water pump 33 or the power of the air-conditioning compressor 11 according to the temperature information of the coolant, so that the air outlet temperature of the warm air core 34 reaches the set value.

[0068] How it works

[0069] An embodiment of the present application provides a hybrid vehicle heat pump air-conditioning system. Since the hybrid vehicle heat pump air-conditioning system of the present application is provided with a heat pump air-conditioning circuit 10, the heat pump air-conditioning circuit 10 includes an air-conditioning compressor 11, a first heat exchanger 12, an in-vehicle condenser 13, a first electronic expansion valve 14, an in-vehicle evaporator 15, and a gas-liquid separator 16 that are interconnected in sequence; a warm air core circuit 30, the warm air core circuit 30 is connected to the engine cooling circuit 32 through a four-way valve 31, and the warm air core circuit 30 includes a first circulating water pump 33 and a warm air core 34 that are interconnected, and the first circulating water pump 33 and the warm air core 34 are connected with the first heat exchanger 12.

[0070] Therefore, the hybrid vehicle heat pump air conditioning system of the present application utilizes the interconnected components of the heat pump air conditioning circuit 10, including the air conditioning compressor 11, first heat exchanger 12, in-vehicle condenser 13, first electronic expansion valve 14, in-vehicle evaporator 15, and gas-liquid separator 16, to form a direct bypass heat pump air conditioner. After activation, the air conditioning compressor 11 directly heats the in-vehicle condenser 13 via refrigerant. The in-vehicle condenser 13 directly heats the passenger compartment, while the in-vehicle evaporator 15 controls the air temperature within the passenger compartment. This direct bypass heat pump air conditioner eliminates the intermediate coolant heating process in the warm air core circuit 30. This not only speeds up passenger compartment heating but also reduces heat loss and lowers air conditioning energy consumption.

[0071] Furthermore, after the coolant in the heater core circuit 30 is heated to a first temperature by the engine, the first circulating water pump 33 is activated, allowing the heat pump air conditioning circuit 10 and the heater core circuit 30 to exchange heat with each other through the first heat exchanger 12. The passenger compartment is then directly heated by the in-vehicle condenser 13 and the heater core 34. This accelerates passenger compartment heating, reduces the power of the air conditioning compressor 11, and lowers the energy consumption of the heat pump air conditioning circuit 10. After the coolant in the heater core circuit 30 is heated to a second temperature by the engine, the heat pump air conditioning circuit 10 can be shut down, and the heater core 34 alone can be used to directly heat the passenger compartment, further reducing energy consumption.

[0072] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. 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 mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0073] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising 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 "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0074] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A hybrid vehicle heat pump air conditioning system, characterized in that: include: A heat pump air conditioning circuit (10), the heat pump air conditioning circuit (10) comprising an air conditioning compressor (11), a first heat exchanger (12), an in-vehicle condenser (13), a first electronic expansion valve (14), an in-vehicle evaporator (15), and a gas-liquid separator (16) which are sequentially interconnected; a heater core circuit (30), the heater core circuit (30) being connected to the engine cooling circuit (32) via a four-way valve (31), the heater core circuit (30) comprising a first circulating water pump (33), a heater core (34), and the first heat exchanger (12) which are interconnected; Also included is a battery coolant circulation loop (40), wherein the battery coolant circulation loop (40) includes a second heat exchanger (41), a battery pack (42), and a second circulating water pump (43) that are interconnected; The second heat exchanger (41) is connected in series to the warm air core circuit (30), and a three-way valve (35) for connecting or disconnecting the second heat exchanger (41) is connected in series to the warm air core circuit (30); The water inlet of the second heat exchanger (41) is in communication with the three-way valve (35), and the water outlet of the second heat exchanger (41) is in communication with the downstream pipeline of the three-way valve (35) through a three-way pipe (36), and the three-way valve (35) is connected to the downstream pipeline of the heater core (34); The heat pump air conditioning circuit (10) further includes an indirect heating branch, wherein the indirect heating branch inlet is connected to the first heat exchanger (12), and the indirect heating branch outlet is connected to the gas-liquid separator (16), and a fourth electronic expansion valve (24) and a third solenoid valve (25) are connected in series to the indirect heating branch.

2. The hybrid vehicle heat pump air conditioning system according to claim 1, characterized in that: The battery coolant circulation loop (40) is provided with a first temperature sensor (44) and a second temperature sensor (45), and the first temperature sensor (44) and the second temperature sensor (45) are respectively connected to the water inlet and the water outlet of the battery pack (42).

3. A hybrid vehicle heat pump air conditioning system according to claim 1 or 2, characterized in that: The heat pump air conditioning circuit (10) further includes an off-vehicle heat exchanger (17), the inlet of the off-vehicle heat exchanger (17) being connected to the first electronic expansion valve (14) via a second electronic expansion valve (19), and the outlet of the off-vehicle heat exchanger (17) being connected to the gas-liquid separator (16) via a first solenoid valve (18); The outlet of the first electronic expansion valve (14) is connected to a first temperature and pressure sensor (21), the inlet of the in-vehicle evaporator (15) is connected to a third electronic expansion valve (20), and the inlets of the second electronic expansion valve (19) and the third electronic expansion valve (20) are both connected to the first temperature and pressure sensor (21).

4. The hybrid vehicle heat pump air conditioning system according to claim 3, characterized in that: The heat pump air conditioning circuit (10) further includes a battery pack heat exchange branch for exchanging heat for the battery pack (42), wherein the inlet of the battery pack heat exchange branch is connected to the downstream pipeline of the second electronic expansion valve (19), and the outlet of the battery pack heat exchange branch is connected to the downstream pipeline of the in-vehicle evaporator (15), and the second solenoid valve (22) and the third heat exchanger (23) are connected in series on the battery pack heat exchange branch.

5. The hybrid vehicle heat pump air conditioning system according to claim 1, characterized in that: The heat pump air conditioning circuit (10) further includes a second temperature and pressure sensor (26) connected to the inlet of the gas-liquid separator (16), and a third temperature and pressure sensor (27) connected to the outlet of the air conditioning compressor (11), a bypass branch is provided between the outlet of the third temperature and pressure sensor (27) and the inlet of the second temperature and pressure sensor (26), and a fifth electronic expansion valve (28) is connected to the bypass branch.

6. The hybrid vehicle heat pump air conditioning system according to claim 5, characterized in that: The heat pump air conditioning circuit (10) further includes a one-way valve (29) connected to a pipeline between the in-vehicle evaporator (15) and the second temperature and pressure sensor (26), and the outlet of the fifth electronic expansion valve (28) is connected to a pipeline downstream of the outlet of the one-way valve (29).

7. The hybrid vehicle heat pump air conditioning system according to claim 1, characterized in that: A third temperature sensor (37) is connected to the warm air core circuit (30), and the third temperature sensor (37) is connected upstream of the warm air core (34).

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