Heat pump air-conditioning system of hybrid electric vehicle

Abstract

The invention relates to a hybrid electric vehicle heat pump air conditioning system which comprises a heat pump air conditioning loop which comprises 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 sequentially communicated with one another. The warm air core body loop is connected with the engine cooling loop through a four-way valve, the warm air core body loop comprises a first circulating water pump and a warm air core body which are communicated with each other, and a first heat exchanger is communicated between the first circulating water pump and the warm air core body. According to the direct bypass heat pump air conditioner, the air conditioner compressor, the first heat exchanger, the in-vehicle condenser, the first electronic expansion valve, the in-vehicle evaporator and the gas-liquid separator of the heat pump air conditioner loop are connected with one another to form the direct bypass heat pump air conditioner. After the air conditioner compressor is started, the in-vehicle condenser is directly heated through the refrigerant, the in-vehicle condenser directly heats the passenger compartment, the heating speed of the passenger compartment can be increased, heat loss is reduced, and energy consumption of the air conditioner is reduced.

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 vehicle. Background Art

[0002] At present, plug-in hybrid electric vehicles (PHEV) are becoming more and more popular among consumers because of their dual-use of oil and electricity and long driving range. However, in winter, especially in areas below zero degrees, the pure electric mode requires PTC heaters to heat the battery and the passenger compartment, which consumes high energy and greatly shortens the driving range.

[0003] The energy efficiency of heat pump air conditioners is 2-3 times that of PTC thermosensitive air conditioners, which can effectively extend the driving range of PHEV vehicles in pure electric mode. However, heat pump air conditioners use air as a heat source, and the heat in the air is dispersed and irregularly distributed, which will affect the efficiency of the heat pump and slow the heating speed. If the air temperature is particularly low, the heating efficiency of the heat pump air conditioner will be lower and the heating speed will be slower, and energy consumption will increase.

[0004] However, PHEV cars are equipped with indirect heat pump air conditioners, which need to first use refrigerant to heat the engine coolant circuit, and then use the heater core to exchange heat with the air in the passenger compartment to heat the passenger compartment. In extremely cold environments or in pure electric driving mode, indirect heat pump air conditioners are difficult to quickly heat the engine coolant circuit to heat the passenger compartment, resulting in slow heating and poor comfort in the passenger compartment. 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 embodiment of the present application provides a hybrid vehicle heat pump air conditioning system, 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] A heater core circuit is 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 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 through a second electronic expansion valve, and the outlet of the off-vehicle heat exchanger is connected to the gas-liquid separator through 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 electronic expansion valve and the third electronic expansion valve 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 a battery pack, the inlet of the battery pack heat exchange branch is connected to a downstream pipeline of a second electronic expansion valve, the outlet of the battery pack heat exchange branch is connected to a downstream pipeline of an in-vehicle evaporator, and a second solenoid valve and a 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 loop, 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] The 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 which 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 which 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 the air conditioning compressor, the first heat exchanger, the in-vehicle condenser, the first electronic expansion valve, the in-vehicle evaporator, and the gas-liquid separator of the heat pump air conditioning circuit to form a direct bypass heat pump air conditioning. After the air conditioning compressor is started, the in-vehicle condenser is directly heated by the refrigerant, the in-vehicle condenser directly heats the passenger compartment, and the in-vehicle evaporator transfers the air temperature in the passenger compartment. The direct bypass heat pump air conditioning eliminates the process of heating the coolant in the warm air core circuit. 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 reduces the energy consumption of the air conditioner.

[0023] In addition, when the coolant in the heater core circuit is heated to the first temperature by the engine, the first circulating water pump is started, so that the heat pump air conditioning circuit and the heater core circuit are heat-exchanged with each other through the first heat exchanger, and the passenger compartment is directly heated by the in-vehicle condenser and the heater core, which can speed up the heating speed of the passenger compartment, reduce the power of the air conditioning compressor, and reduce the energy consumption of the heat pump air conditioning circuit. When the coolant in the heater core circuit is heated to the second temperature by the engine, the heat pump air conditioning circuit can be closed, and the heater core can be used 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 drawings required for use in the description of the embodiments will be briefly introduced below. 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 paying any creative work.

[0025] Figure 1 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 schematic 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 schematic 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 It is a structural schematic diagram of the third working mode of the heat pump air conditioning system of a hybrid vehicle according to an embodiment of the present application;

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

[0030] Figure 6 This is a structural schematic 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. Out-vehicle heat exchanger; 18. First solenoid valve; 19. Second electronic expansion valve;

[0033] 20. The third electronic expansion valve; 21. The first temperature and pressure sensor; 22. The second solenoid valve; 23. The third heat exchanger; 24. The fourth electronic expansion valve; 25. The third solenoid valve; 26. The second temperature and pressure sensor; 27. The third temperature and pressure sensor; 28. The fifth electronic expansion valve; 29. ​​The 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 circulation water pump; 44. First temperature sensor; 45. Second temperature sensor. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work 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, including:

[0039] 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 which are interconnected in sequence. The air conditioning compressor 11, 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 are interconnected to form a direct bypass heat pump air conditioner. After the air conditioning compressor 11 is started, the in-vehicle condenser 13 is directly heated by the refrigerant, the in-vehicle condenser 13 directly heats the passenger compartment, and the in-vehicle evaporator 15 carries the air temperature in the passenger compartment.

[0040] The heater core loop 30 is connected to the engine cooling loop 32 through a four-way valve 31. The heater core loop 30 includes a first circulating water pump 33 and a heater core 34 that 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 loop 30 is heated to a first temperature by the engine, the first circulating water pump 33 is started, so that the heat pump air conditioning loop 10 and the heater core loop 30 are heat-exchanged with each other through the first heat exchanger 12, and the passenger compartment is directly heated by the in-vehicle condenser 13 and the heater core 34.

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

[0042] The low-temperature and 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 and 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 and low-pressure two-phase fluid after the pressure is reduced by the resistance of the first electronic expansion valve 14, and enters the in-vehicle evaporator 15 to evaporate and absorb heat. Then the superheated gas enters the next cycle through the gas-liquid separator 16.

[0043] See also Figure 3 As shown, the heat pump air conditioning system of the hybrid vehicle is in the second 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. In the second working mode, when the coolant in the warm air core loop 30 is heated to the first temperature by the engine, the first circulating water pump 33 is started, so that the heat pump air conditioning loop 10 and the warm air core loop 30 exchange heat with each other through the first heat exchanger 12.

[0044] By using the in-vehicle condenser 13 and the heater core 34 to directly heat the passenger compartment, the heating speed of the passenger compartment can be accelerated, the power of the air-conditioning compressor can be reduced, and the energy consumption of the heat pump air-conditioning circuit can be reduced. When the coolant in the heater core circuit 30 is heated to the second temperature by the engine, and the second temperature is greater than the first temperature, the heat pump air-conditioning circuit 10 can be closed, and the heater core 34 can be used alone to directly heat the passenger compartment, further reducing energy consumption.

[0045] The hybrid vehicle heat pump air conditioning system of the embodiment of the present application utilizes the air conditioning compressor 11, 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 of the heat pump air conditioning loop 10 to form a direct bypass heat pump air conditioning. After the air conditioning compressor 11 is started, the in-vehicle condenser 13 is directly heated by the refrigerant, the in-vehicle condenser 13 directly heats the passenger compartment, and the in-vehicle evaporator 15 carries the air temperature in 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 , which can speed up the heating of the passenger compartment on the one hand, and reduce heat loss and energy consumption of the air conditioner on the other hand.

[0047] In addition, when the coolant in the warm air core loop 30 is heated to the first temperature by the engine, the first circulating water pump 33 is started, so that the heat pump air conditioning loop 10 and the warm air core loop 30 are heat-exchanged with each other through the first heat exchanger 12. The passenger compartment is directly heated by the in-vehicle condenser 13 and the warm air core 34, which can speed up the heating speed of the passenger compartment, reduce the power of the air conditioning compressor 11, and reduce the energy consumption of the heat pump air conditioning loop 10. When the coolant in the warm air core loop 30 is heated to the second temperature by the engine, the heat pump air conditioning loop 10 can be turned off, and the warm air core 34 can be used alone 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, the 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 that are interconnected. The second heat exchanger 41 is connected in series to the warm air core loop 30, and a three-way valve 35 that connects or disconnects the second heat exchanger 41 is connected in series to the warm air core loop 30.

[0049] The water inlet of the second heat exchanger 41 is connected to the three-way valve 35, and the water outlet of the second heat exchanger 41 is connected to the downstream pipeline of the three-way valve 35 through the 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 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.

[0050] See also Figure 4 As shown, the heat pump air conditioning system of the hybrid vehicle is in the third 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. In the third working mode, when the coolant in the warm air core loop 30 is heated to the first temperature by the engine, the first circulating water pump 33 is started, so that the heat pump air conditioning loop 10 and the warm air core loop 30 exchange heat with each other through the first heat exchanger 12.

[0051] By using the in-vehicle condenser 13 and the heater core 34 to directly heat the passenger compartment, the heating speed of the passenger compartment can be accelerated, the power of the air-conditioning compressor can be reduced, and the energy consumption of the heat pump air-conditioning circuit can be reduced. When the coolant in the heater core circuit 30 is heated to the second temperature by the engine, and the second temperature is greater than the first temperature, the three-way valve 35 can be switched to connect the heater core circuit 30 to the second heat exchanger 41, and then the heat pump air-conditioning circuit 10 and the heater core circuit 30 use 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, wherein the heat pump air-conditioning circuit 10 of the hybrid vehicle heat pump air-conditioning system further includes an external heat exchanger 17, wherein the inlet of the external heat exchanger 17 is connected to the first electronic expansion valve 14 via a second electronic expansion valve 19, and the outlet of the external heat exchanger 17 is connected to the gas-liquid separator 16 via 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, 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. The first temperature and pressure sensor 21 is used to detect the temperature and pressure information of the refrigerant downstream of the in-vehicle condenser 13. When 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.

[0054] When the first electronic expansion valve 14 and the second electronic expansion valve 19 are in an open state, and the third electronic expansion valve 20 is in a closed state, the hybrid vehicle heat pump air conditioning system is in the fifth working mode. When the first electronic expansion valve 14 and the third electronic expansion valve 20 are in an open state, and the second electronic expansion valve 19 is in a closed state, the hybrid vehicle heat pump air conditioning system is in the first working mode, the second working mode, or the third working 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 in-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, thereby simplifying the structure of the hybrid vehicle heat pump air-conditioning system, providing more working modes and making it more convenient to switch back and forth 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 working mode, the air conditioning compressor 11, the first heat exchanger 12, the in-vehicle condenser 13, the first electronic expansion valve 14, the first temperature and pressure sensor 21, the second electronic expansion valve 19, the out-vehicle heat exchanger 17, the first solenoid valve 18, the fourth electronic expansion valve 24, and the gas-liquid separator 16 are interconnected to form a direct heat pump air conditioner. After the air conditioning compressor 11 is started, the in-vehicle condenser 13 is directly heated by the refrigerant, and the in-vehicle condenser 13 heats the passenger compartment. At the same time, the out-vehicle heat exchanger 17 is used to transport the heat of the air outside the vehicle.

[0058] 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, and 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 for 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 in-vehicle evaporator 15. The second solenoid valve 22 and the third heat exchanger 23 are connected in series on the battery pack heat exchange branch.

[0059] The embodiment of the present application adds a battery pack heat exchange branch for heat exchange of the battery pack 42 to the heat pump air conditioning circuit 10, and the battery pack heat exchange branch is used to heat the battery coolant circulation circuit 40. The 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 opened, the refrigerant discharged from the downstream of the in-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 working mode, the air-conditioning compressor 11, the first heat exchanger 12, the third solenoid valve 25, the fourth electronic expansion valve 24, and the gas-liquid separator 16 are interconnected to form an indirect bypass heat pump air conditioner. After the air-conditioning compressor 11 is started, the coolant in the first heat exchanger 12 is directly heated by the refrigerant. At the same time, the warm air core circuit 30 is connected to the engine cooling circuit 32 through the four-way valve 31, and the warm air core circuit 30 starts the first circulating water pump 33 and switches the three-way valve 35, so that the heat pump air-conditioning circuit 10 and the warm air core circuit 30 exchange heat with each other through the first heat exchanger 12.

[0063] The coolant in the first heat exchanger 12 is heated by the indirect bypass heat pump air conditioning formed by the heat pump air conditioning loop 10, and then flows through the heater core 34, the three-way valve 35, the second heat exchanger 41, the three-way pipe 36, the four-way valve 31, and then enters the water jacket in the engine to be heated again before entering the next cycle. The heater core 34 heated by the coolant heats the passenger compartment, and the second heat exchanger 41 heated by the coolant blocks the battery pack 42 to heat it.

[0064] 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, and the heat pump air conditioning circuit 10 of the hybrid vehicle heat pump air conditioning system also 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 information 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 information at the inlet of the air-conditioning compressor 11. The air-conditioning compressor 11 adjusts its power size according to the difference between the refrigerant pressure and temperature information 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, and the fifth electronic expansion valve 28 is connected to the bypass branch, and the fifth electronic expansion valve 28 is used to adjust the power size 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, wherein 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 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 the downstream pipeline of the outlet of the one-way valve 29. The one-way valve 29 is used to flow the refrigerant flowing out of the in-vehicle evaporator 15 into the second temperature and pressure sensor 26 in one direction.

[0067] A third temperature sensor 37 is connected to the warm air core loop 30. 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 in the warm air core loop 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] The 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 air conditioning compressor 11, 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 of the heat pump air conditioning loop 10 to form a direct bypass heat pump air conditioning. After the air conditioning compressor 11 is started, the in-vehicle condenser 13 is directly heated by the refrigerant, the in-vehicle condenser 13 directly heats the passenger compartment, and the in-vehicle evaporator 15 transfers the air temperature in the passenger compartment. The direct bypass heat pump air conditioning eliminates the process of heating the coolant in the warm air core loop 30. On the one hand, it can speed up the heating speed of the passenger compartment, and on the other hand, it also reduces the heat loss and reduces the energy consumption of the air conditioner.

[0071] In addition, when the coolant in the warm air core loop 30 is heated to the first temperature by the engine, the first circulating water pump 33 is started, so that the heat pump air conditioning loop 10 and the warm air core loop 30 are heat-exchanged with each other through the first heat exchanger 12, and the passenger compartment is directly heated by the in-vehicle condenser 13 and the warm air core 34, which can speed up the heating speed of the passenger compartment, reduce the power of the air conditioning compressor 11, and reduce the energy consumption of the heat pump air conditioning loop 10. When the coolant in the warm air core loop 30 is heated to the second temperature by the engine, the heat pump air conditioning loop 10 can be turned off, and the warm air core 34 can be used alone to directly heat the passenger compartment, further reducing energy consumption.

[0072] In the description of the present application, it should be noted that the terms "upper", "lower", etc. 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 the present application and simplifying the description, rather than indicating or implying 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 the present 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present 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 only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such 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 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, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0074] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A heat pump air conditioning system for a hybrid vehicle, 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 interconnected in sequence; A heater core circuit (30), wherein the heater core circuit (30) is connected to an engine cooling circuit (32) via a four-way valve (31), and the heater core circuit (30) comprises a first circulating water pump (33), a heater core (34) and the first heat exchanger (12) which are interconnected.

2. A hybrid vehicle heat pump air conditioning system as claimed in claim 1, characterized in that: 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) which 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).

3. A hybrid vehicle heat pump air conditioning system as claimed in claim 2, characterized in that: The water inlet of the second heat exchanger (41) is connected to the three-way valve (35), and 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), and the three-way valve (35) is connected to the downstream pipeline of the heater core (34).

4. A hybrid vehicle heat pump air conditioning system as claimed in claim 2, 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).

5. A hybrid vehicle heat pump air conditioning system according to any one of claims 1 to 4, characterized in that: The heat pump air conditioning circuit (10) further comprises 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).

6. A hybrid vehicle heat pump air conditioning system as claimed in claim 5, characterized in that: The heat pump air conditioning circuit (10) also includes a battery pack heat exchange branch for exchanging heat for 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), the outlet of the battery pack heat exchange branch is connected to the downstream pipeline of the in-vehicle evaporator (15), and the battery pack heat exchange branch is connected in series with a second solenoid valve (22) and a third heat exchanger (23).

7. A hybrid vehicle heat pump air conditioning system according to any one of claims 1 to 4, characterized in that: The heat pump air conditioning circuit (10) also includes an indirect heating branch, the inlet of the indirect heating branch is connected to the first heat exchanger (12), the outlet of the indirect heating branch is connected to the gas-liquid separator (16), and the indirect heating branch is connected in series with a fourth electronic expansion valve (24) and a third solenoid valve (25).

8. The hybrid vehicle heat pump air conditioning system according to claim 1, characterized in that: The heat pump air conditioning circuit (10) further comprises 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.

9. A hybrid vehicle heat pump air conditioning system as claimed in claim 8, characterized in that: The heat pump air conditioning circuit (10) further comprises 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).

10. 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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