Vehicle air conditioning system and control method

Abstract

The present invention provides a vehicle air conditioning system, the system includes an air conditioning circulation pipeline, a battery thermal management pipeline and a cabin heating circulation pipeline; the battery thermal management pipeline and the air conditioning circulation pipeline exchange heat through a first plate heat exchanger and a second plate heat exchanger respectively; the cabin heating circulation pipeline and the air conditioning circulation pipeline exchange heat through a second plate heat exchanger. The air conditioning system of the present invention installs a plate heat exchanger between the compressor and the four-way valve, which can be used to recover the heat of the compressor exhaust, and then transfer the heat to the battery side or the radiator side through the refrigerant. When the air conditioning system is running in the cooling mode, the heat in the compressor exhaust can be preferentially used to meet the heat demand of some areas of the vehicle, without the need for electric heating or fuel heating to cause additional energy consumption of the whole vehicle. At the same time, the application of the plate heat exchanger increases the heat exchange effect of the condenser, further improving the energy efficiency of the whole vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile air conditioning, and in particular to a vehicle air conditioning system and a control method thereof. Background Art

[0002] With the development of the national economy and the improvement of people's living standards, the number of highways and air-conditioned buses has increased rapidly. As a common mode of travel, people have higher and higher demands for the comfort of buses. Bus air conditioning plays a very important role in creating a comfortable environment in the car, protecting the health of drivers and passengers, and improving the working conditions of drivers. Therefore, the performance of bus air conditioning has become an important basis for evaluating bus comfort. However, due to the large size of passenger vehicles, thin insulation layer, many doors and windows, high passenger density, and difficult airflow organization and distribution, the thermal insulation performance is poor, the heat and humidity load is large, and the temperature and airflow balance in the car is poor.

[0003] Due to structural limitations, bus air conditioners are often placed on the top of the bus, and the air supply ducts and outlets are also installed on the upper left and right sides of the bus to provide cooling and heating for the interior environment. In addition, due to national energy-saving and environmental protection requirements, the proportion of new energy buses is increasing. The role of air conditioners is not only limited to providing cooling and heating for the interior environment, but also takes into account battery cooling and vehicle thermal management. Therefore, a multifunctional and energy-saving air conditioner has become a development trend.

[0004] The existing passenger car air conditioning unit structure can meet customers' demand for air conditioning products to a certain extent, but it still has obvious defects:

[0005] 1. When the vehicle is relatively long, especially for some special vehicles such as double-decker vehicles, the air duct installation of some areas is blocked due to structural limitations. In this case, it is difficult to achieve uniform distribution of temperature and air flow regulation in the vehicle, especially in the cab position far away from the air outlet of the air conditioner, which is not conducive to improving the working environment of the driver;

[0006] 2. Existing bus air conditioners are difficult to fully meet the requirements of both cooling and heating, such as in-car cooling + battery heating, in-car heating + battery cooling, etc.

[0007] 3. When the air conditioner is in cooling mode, the heat absorbed in the car can only be discharged outside the car. When there is a need for heating, it can only be solved by electric heating or fuel heating. However, the use of electric heating or fuel heating will significantly increase the energy consumption of the whole vehicle.

[0008] 4. When heating multiple areas or components, the heat demand is constantly changing. The control system will directly meet the heating demand by switching the valves, but this control method will cause energy fluctuations and cause system instability. Summary of the invention

[0009] In order to solve the above problems, a vehicle air conditioning system and a control method are provided.

[0010] The object of the present invention is achieved in the following manner:

[0011] A vehicle air conditioning system, the system comprising an air conditioning circulation pipeline, a battery thermal management pipeline and a vehicle compartment heating circulation pipeline; the battery thermal management pipeline and the air conditioning circulation pipeline exchange heat through a first plate heat exchanger 6 and a second plate heat exchanger 7 respectively; the vehicle compartment heating circulation pipeline and the air conditioning circulation pipeline exchange heat through the second plate heat exchanger 7.

[0012] The air conditioning circulation pipeline includes a compressor 1, an electric proportional three-way valve 2, a first plate heat exchanger 6, a second plate heat exchanger 7, a four-way valve 3, an off-board heat exchanger 4, a first electronic expansion valve 8, a second electronic expansion valve 9, a third electronic expansion valve 10, a single cooler 11, a first non-return valve 15, a second non-return valve 16, an in-vehicle heat exchanger 5 and a gas-liquid separator 25; the exhaust port of the compressor 1 is connected to the A port of the electric proportional three-way valve 2 through a pipeline, the B port of the electric proportional three-way valve 2 is connected to the D port of the four-way valve 3 through a pipeline, the C port of the electric proportional three-way valve 2 is connected to the first inlet of the second plate heat exchanger 7, the outlet of the second plate heat exchanger 7 is connected to the D port of the four-way valve 3 through a pipeline, and the C port of the four-way valve 3 is connected to the It is connected to one end of the outdoor heat exchanger 4, and the other end of the outdoor heat exchanger 4 is divided into three paths. The first path is connected to the third electronic expansion valve 10, the single cooler 11 and the E port of the four-way valve 3 in sequence. The second path is connected to the second one-way valve 16, the second electronic expansion valve 9, the first inlet of the first plate heat exchanger 6, the first outlet of the first plate heat exchanger 6 and the gas-liquid separator 25. The third path is connected to the first electronic expansion valve 8 and one end of the indoor heat exchanger 5 in sequence. The other end of the indoor heat exchanger 5 is connected to the E port of the four-way valve 3 through a pipeline. The S port of the four-way valve 3 is connected to one end of the gas-liquid separator 25. The other end of the gas-liquid separator 25 is connected to the air intake port of the compressor 1. A first one-way valve 15 is also provided between the indoor heat exchanger 5 and the second electronic expansion valve.

[0013] The battery thermal management pipeline includes a first circulation loop and a second circulation loop; the first circulation loop includes a first expansion water tank 22, a first circulation pump 21, a first electric two-way valve 17 and a battery pack 12; the second outlet of the first plate heat exchanger 6 is connected to the expansion water tank, the first circulation pump 21, the first electric two-way valve 17, the battery pack 12 and the second inlet of the first plate heat exchanger 6 in sequence to form a first circulation loop; the second circulation loop includes an electric water heater 14, a second expansion water tank 24, a second circulation pump 23, a second electric two-way valve 18, the battery pack 12, and a fourth electric two-way valve 20; the second outlet of the second plate heat exchanger 7, the electric water heater 14, the second expansion water tank 24, the second circulation pump 23, the second electric two-way valve 18, the battery pack 12, the fourth electric two-way valve 20 and the second inlet of the second plate heat exchanger 7 are connected in sequence to form a second circulation loop.

[0014] The carriage heating circulation pipeline includes an electric water heater 14, a second expansion water tank 24, a second circulation pump 23, a third electric two-way valve 19, and a wall-mounted radiator 13; the second outlet of the second plate heat exchanger 7, the electric water heater 14, the second expansion water tank 24, the second circulation pump 23, the third electric two-way valve 19, the wall-mounted radiator 13 and the second inlet of the second plate heat exchanger 7 are connected in sequence to form a circulation loop.

[0015] An exhaust temperature sensor is arranged at the exhaust port of the compressor 1, an intake temperature sensor is arranged at the intake port, an external disk temperature sensor is arranged at the external heat exchanger 4, a first internal disk temperature sensor is arranged on the internal heat exchanger 5, a second internal disk temperature sensor is arranged on the single cooler 11, a second outlet water temperature sensor is arranged at the second outlet of the first plate heat exchanger 6, a first return water temperature sensor is arranged at the second inlet of the first plate heat exchanger (6), a first outlet water temperature sensor is arranged between the electric water heater 14 and the second expansion water tank 24, and a second return water temperature sensor is arranged at the second inlet of the second plate heat exchanger 7.

[0016] A control method for a vehicle air conditioning system, the control method comprising the following working modes: cooling and cooler-only mode, cooling and battery cooling mode, cooling and battery heating mode, cooling and cabin heating mode, heating and cooler-only mode, heating and battery cooling mode, heating and battery heating mode, heating and cabin heating mode, and dehumidification mode;

[0017] When the air conditioning system is in the cooling and single cooler mode or the cooling and battery cooling mode, the four-way valve 3 is not energized, the DC port and the ES port of the four-way valve 3 are connected, and the AB port of the electric proportional three-way valve 2 is connected:

[0018] The system refrigerant flow direction of the refrigeration and single cooler 11 mode is in turn the exhaust port of the compressor 1, the AB port of the electric proportional three-way valve 2, the DC port of the four-way valve 3, the vehicle exterior heat exchanger 4, one way through the first electronic expansion valve 8 to the vehicle interior heat exchanger 5 and another way through the third electronic expansion valve 10 to the single cooler 11, the ES port of the four-way valve 3, the gas-liquid separator 25, and the air intake port of the compressor 1;

[0019] The system refrigerant flow direction of the refrigeration and battery cooling mode is, in sequence, the exhaust port of the compressor 1, the AB port of the electric proportional three-way valve 2, the DC port of the four-way valve 3, the outdoor heat exchanger 4, one way through the first electronic expansion valve 8 to the indoor heat exchanger 5 to the ES port of the four-way valve 3, and another way through the second one-way valve 16 to the second electronic expansion valve 9 to the first plate heat exchanger 6, the gas-liquid separator 25, and the air intake port of the compressor 1; after the refrigerant reaches the first plate heat exchanger 6, it absorbs the heat conducted by the battery pack 12 through the first circulation loop on the battery thermal management pipeline, thereby realizing the refrigeration and battery cooling functions.

[0020] When the air conditioning system is in the cooling and battery heating mode or the cooling and cabin heating mode, the four-way valve 3 is not energized, the DC port and the ES port of the four-way valve 3 are connected, and the AB port and the AC port of the electric proportional three-way valve 2 are connected at the same time;

[0021] The refrigerant flow direction of the cooling and battery heating mode system is as follows: the exhaust port of the compressor 1, the AB port of the electric proportional three-way valve 2 and the AC port of the electric proportional three-way valve 2 to the second plate heat exchanger 7, the DC port of the four-way valve 3, the external heat exchanger 4, the first electronic expansion valve 8, the internal heat exchanger 5, the ES port of the four-way valve 3, the gas-liquid separator 25, and the air intake port of the compressor 1; the heat in the exhaust gas of the compressor 1 is recovered by the second plate heat exchanger 7 and the electric water heater 14 in the second circulation loop on the battery thermal management pipeline is heated, so that the water temperature circulating through the battery pack 12 rises to the target water temperature, thereby achieving battery heating;

[0022] The refrigerant flow direction of the cooling and cabin heating mode system is as follows: the exhaust port of the compressor 1, the AB port of the electric proportional three-way valve 2 and the AC port of the electric proportional three-way valve 2 to the second plate heat exchanger 7, the DC port of the four-way valve 3, the outdoor heat exchanger 4, the first electronic expansion valve 8, the indoor heat exchanger 5, the ES port of the four-way valve 3, the gas-liquid separator 25, and the air intake port of the compressor 1; the heat in the exhaust gas of the compressor 1 is recovered by the second plate heat exchanger 7 and the electric water heater (14) in the cabin heating circulation pipeline is heated, so that the water temperature on the heating side rises to the target water temperature to provide heat to the wall-mounted radiator 13.

[0023] When the air conditioning system is in the heating and single cooler mode or the heating and battery cooling mode, the four-way valve 3 is energized, the DE port of the four-way valve 3 is connected to the CS port, and the AB port of the electric proportional three-way valve 2 is connected;

[0024] The refrigerant flow directions of the heating and single cooler mode systems are as follows: the exhaust port of the compressor 1, the DE port of the four-way valve 3, the in-vehicle heat exchanger 5 to the first electronic expansion valve 8 and the single cooler 11 to the third electronic expansion valve 10, the outdoor heat exchanger 4, the CS port of the four-way valve 3, the gas-liquid separator 25, and the air intake port of the compressor 1;

[0025] The refrigerant flow direction of the heating and battery cooling mode system is as follows: the exhaust port of the compressor 1, the DE port of the four-way valve 3, the in-vehicle heat exchanger 5, the first electronic expansion valve 8 to the outdoor heat exchanger 4 to the CS port of the four-way valve 3 and the first one-way valve 15 to the second electronic expansion valve 9 to the first plate heat exchanger 6, the gas-liquid separator 25, and the suction port of the compressor 1. After the refrigerant reaches the first plate heat exchanger 6, it absorbs the heat conducted by the battery pack 12 through the first circulation loop on the battery thermal management pipeline to achieve the battery cooling function.

[0026] When the air conditioning system is in the heating and battery heating mode or the heating and cabin heating mode, the four-way valve 3 is energized, the DE port and the CS port of the four-way valve 3 are connected, and the AB port and the AC port of the electric proportional three-way valve 2 are connected at the same time;

[0027] The refrigerant flow direction of the heating and battery heating mode system is as follows: the exhaust port of the compressor 1, the AB port of the electric proportional three-way valve 2 and the AC port of the electric proportional three-way valve 2 to the second plate heat exchanger 7, the DE port of the four-way valve 3, the in-vehicle heat exchanger 5, the first electronic expansion valve 8, the out-vehicle heat exchanger 4, the CS port of the four-way valve (3), the gas-liquid separator 25, and the air intake port of the compressor 1; the heat in the exhaust gas of the compressor 1 is recovered by the second plate heat exchanger 7 and the electric water heater 14 in the second circulation loop on the battery thermal management pipeline is heated, so that the water temperature circulating through the battery pack 12 rises to the target water temperature, thereby achieving battery heating;

[0028] The refrigerant flow direction of the heating and cabin heating mode system is as follows: the exhaust port of compressor 1, the AB port of the electric proportional three-way valve 2 and the AC port of the electric proportional three-way valve 2 to the second plate heat exchanger 7, the DE port of the four-way valve 3, the in-vehicle heat exchanger 5, the first electronic expansion valve 8, the outdoor heat exchanger 4, the CS port of the four-way valve 3, the gas-liquid separator 25, and the suction port of compressor 1. The heat in the exhaust gas of compressor 1 is recovered through the second plate heat exchanger 7 and heated by the electric water heater 14 in the cabin heating circulation pipeline, so that the water temperature on the heating side rises to the target water temperature to provide heat to the wall-mounted radiator 13.

[0029] When the air conditioning system is in the dehumidification mode, the four-way valve 3 is not energized, the DC port and ES port of the four-way valve 3 are connected, the AB port and AC port of the electric proportional three-way valve 2 are connected at the same time, and the third electric two-way valve 19 is opened; the system refrigerant flows in the following order: the exhaust port of the compressor 1, the AB port of the electric proportional three-way valve 2 and the AC port of the electric proportional three-way valve 2 to the second plate heat exchanger 7, the DC port of the four-way valve 3, the outdoor heat exchanger 4, the first electronic expansion valve 8 to the indoor heat exchanger 5 and the third electronic expansion valve 10 to the single cooler 11, the ES port of the four-way valve 3, the gas-liquid separator 25, and the air intake port of the compressor 1; the heat in the exhaust gas of the compressor 1 is recovered through the second plate heat exchanger 7 and the electric water heater 14 in the car heating circulation pipeline is heated, so that the water temperature on the heating side rises to the target water temperature to provide heat to the wall-mounted radiator 13.

[0030] Beneficial effects of the invention: Compared with the existing passenger car air conditioners, the patent of the present invention adds the application of a single cooler, solves the problems of obstructed installation of air-conditioning ducts in some areas of special vehicles, difficulty in delivering cooling and heating, and uneven distribution of temperature and airflow regulation in the car.

[0031] The waste heat recovery system is integrated to recover the exhaust heat of the compressor through secondary heat exchange, which solves the problem of increased energy consumption of the whole vehicle due to the use of electric heating or fuel heating when the air conditioner is running for cooling. This application also improves the condensation heat exchange effect and further improves the energy efficiency of the whole vehicle.

[0032] The application of electric proportional three-way valve has been increased. According to multi-parameter intelligent control, the valve opening can be accurately adjusted, the temperature fluctuation is small, and the system stability is ensured.

[0033] Compared with the existing bus air conditioners, the patent of this invention has greater scalability. The corresponding interfaces can be increased or reduced in the system according to demand. It can be connected to multiple single coolers, wall-mounted radiators, defrosters, step radiators, driver heaters and other components to achieve thermal management of the entire vehicle and meet different needs.

[0034] The patent of this invention can provide cooling or heating to the battery and wall-mounted radiator when the system is operating in cooling or heating mode, thereby achieving all-weather thermal management of the battery and the entire vehicle.

[0035] Compared with existing technologies, this technology has the characteristics of high compatibility, high scalability and high integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a system principle diagram of the present invention.

[0037] Figure 2 It is a schematic diagram of the piping of the refrigeration and single cooler modes of the present invention.

[0038] Figure 3 It is a schematic diagram of the piping of the refrigeration and battery cooling mode of the present invention.

[0039] Figure 4 It is a schematic diagram of the piping of the cooling and battery heating modes of the present invention.

[0040] Figure 5 It is a schematic diagram of the piping of the cooling and cabin heating modes of the present invention.

[0041] Figure 6 It is a schematic diagram of the piping of the heating and single cooling modes of the present invention.

[0042] Figure 7 It is a schematic diagram of the piping of the heating and battery cooling mode of the present invention.

[0043] Figure 8 It is a schematic diagram of the pipelines of the heating and battery heating modes of the present invention.

[0044] Fig. 9 It is a schematic diagram of the piping of the heating and cabin heating modes of the present invention.

[0045] Fig.10 It is a piping schematic diagram of the dehumidification mode of the present invention.

[0046] Among them, 1-compressor, 2-electric proportional three-way valve, 3-four-way valve, 4-out-of-vehicle heat exchanger, 5-in-vehicle heat exchanger, 6-first plate heat exchanger, 7-second plate heat exchanger, 8-first electronic expansion valve, 9-second electronic expansion valve, 10-third electronic expansion valve, 11-single cooler, 12-battery pack, 13-wall-mounted radiator, 14-electric water heater, 15-first one-way valve, 16-second one-way valve, 17-first electric two-way valve, 18-second electric two-way valve, 19-third electric two-way valve, 20-fourth electric two-way valve, 21-first circulation pump, 22-first expansion water tank, 23 second circulation pump, 24-second expansion water tank, 25-gas-liquid separator. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0049] A vehicle air conditioning system, the system comprising an air conditioning circulation pipeline, a battery thermal management pipeline and a vehicle compartment heating circulation pipeline; the battery thermal management pipeline and the air conditioning circulation pipeline exchange heat through a first plate heat exchanger 6 and a second plate heat exchanger 7 respectively; the vehicle compartment heating circulation pipeline and the air conditioning circulation pipeline exchange heat through the second plate heat exchanger 7.

[0050] The air conditioning circulation pipeline includes a compressor 1, an electric proportional three-way valve 2, a first plate heat exchanger 6, a second plate heat exchanger 7, a four-way valve 3, an off-board heat exchanger 4, a first electronic expansion valve 8, a second electronic expansion valve 9, a third electronic expansion valve 10, a single cooler 11, a first non-return valve 15, a second non-return valve 16, an in-vehicle heat exchanger 5 and a gas-liquid separator 25; the exhaust port of the compressor 1 is connected to the A port of the electric proportional three-way valve 2 through a pipeline, the B port of the electric proportional three-way valve 2 is connected to the D port of the four-way valve 3 through a pipeline, the C port of the electric proportional three-way valve 2 is connected to the first inlet of the second plate heat exchanger 7, the outlet of the second plate heat exchanger 7 is connected to the D port of the four-way valve 3 through a pipeline, and the C port of the four-way valve 3 is connected to the It is connected to one end of the outdoor heat exchanger 4, and the other end of the outdoor heat exchanger 4 is divided into three paths. The first path is connected to the third electronic expansion valve 10, the single cooler 11 and the E port of the four-way valve 3 in sequence. The second path is connected to the second one-way valve 16, the second electronic expansion valve 9, the first inlet of the first plate heat exchanger 6, the first outlet of the first plate heat exchanger 6 and the gas-liquid separator 25. The third path is connected to the first electronic expansion valve 8 and one end of the indoor heat exchanger 5 in sequence. The other end of the indoor heat exchanger 5 is connected to the E port of the four-way valve 3 through a pipeline, and the S port of the four-way valve 3 is connected to one end of the gas-liquid separator 25. The other end of the gas-liquid separator 25 is connected to the air intake port of the compressor 1. A first one-way valve 15 is also provided between the indoor heat exchanger 5 and the second electronic expansion valve 9.

[0051] The battery thermal management pipeline includes a first circulation loop and a second circulation loop; the first circulation loop includes a first expansion water tank 22, a first circulation pump 21, a first electric two-way valve 17 and a battery pack 12; the second outlet of the first plate heat exchanger 6 is connected to the expansion water tank, the first circulation pump 21, the first electric two-way valve 17, the battery pack 12 and the second inlet of the first plate heat exchanger 6 in sequence to form a first circulation loop; the second circulation loop includes an electric water heater 14, a second expansion water tank 24, a second circulation pump 23, a second electric two-way valve 18, the battery pack 12, and a fourth electric two-way valve 20; the second outlet of the second plate heat exchanger 7, the electric water heater 14, the second expansion water tank 24, the second circulation pump 23, the second electric two-way valve 18, the battery pack 12, the fourth electric two-way valve 20 and the second inlet of the second plate heat exchanger 7 are connected in sequence to form a second circulation loop.

[0052] The carriage heating circulation pipeline includes an electric water heater 14, a second expansion water tank 24, a second circulation pump 23, a third electric two-way valve 19, and a wall-mounted radiator 13; the second outlet of the second plate heat exchanger 7, the electric water heater 14, the second expansion water tank 24, the second circulation pump 23, the third electric two-way valve 19, the wall-mounted radiator 13 and the second inlet of the second plate heat exchanger 7 are connected in sequence to form a circulation loop.

[0053] The exhaust port of the compressor 1 is provided with an exhaust temperature sensor, the intake port is provided with an intake temperature sensor, the external heat exchanger 4 is provided with an external disk temperature sensor, the internal heat exchanger 5 is provided with a first internal disk temperature sensor, the single cooler 11 is provided with a second internal disk temperature sensor, the second outlet of the first plate heat exchanger 6 is provided with a second water outlet temperature sensor, the second inlet of the first plate heat exchanger 6 is provided with a first return water temperature sensor, the first outlet water temperature sensor is provided between the electric water heater 14 and the second expansion water tank 24, and the second return water temperature sensor is provided at the second inlet of the second plate heat exchanger 7. (The sensors are not shown in the attached drawings).

[0054] A control method for a vehicle air conditioning system, the control method comprising the following working modes: cooling and cooler-only mode, cooling and battery cooling mode, cooling and battery heating mode, cooling and cabin heating mode, heating and cooler-only mode, heating and battery cooling mode, heating and battery heating mode, heating and cabin heating mode, and dehumidification mode;

[0055] When the air conditioning system is in the cooling and single cooler mode or the cooling and battery cooling mode, the four-way valve 3 is not energized, the DC port and the ES port of the four-way valve 3 are connected, and the AB port of the electric proportional three-way valve 2 is connected:

[0056] The system refrigerant flow directions of the refrigeration and single cooler 11 modes are, in order, the exhaust port of the compressor 1, the DC port of the four-way valve 3, the outside heat exchanger 4, one way through the first electronic expansion valve 8 to the inside heat exchanger 5 and another way through the third electronic expansion valve 10 to the single cooler 11, the ES port of the four-way valve 3, the gas-liquid separator 25, and the air intake port of the compressor 1;

[0057] The system refrigerant flow directions in the refrigeration and battery cooling modes are, in sequence, the exhaust port of the compressor 1, the DC port of the four-way valve 3, the outdoor heat exchanger 4, one path through the first electronic expansion valve 8 to the indoor heat exchanger 5 to the ES port of the four-way valve 3, and another path through the second one-way valve 16 to the second electronic expansion valve 9 to the first plate heat exchanger 6, the gas-liquid separator 25, and the air intake port of the compressor 1; after the refrigerant reaches the first plate heat exchanger 6, it absorbs the heat conducted by the battery pack 12 through the first circulation loop on the battery thermal management pipeline, thereby realizing the refrigeration and battery cooling functions.

[0058] When the air conditioning system is in the cooling and battery heating mode or the cooling and cabin heating mode, the four-way valve 3 is not energized, the DC port and the ES port of the four-way valve 3 are connected, and the AB port and the AC port of the electric proportional three-way valve 2 are connected at the same time;

[0059] The refrigerant flow direction of the cooling and battery heating mode system is as follows: the exhaust port of the compressor 1, the AB port of the electric proportional three-way valve 2 and the AC port of the electric proportional three-way valve 2 to the second plate heat exchanger 7, the DC port of the four-way valve 3, the external heat exchanger 4, the first electronic expansion valve 8, the internal heat exchanger 5, the ES port of the four-way valve 3, the gas-liquid separator 25, and the air intake port of the compressor 1; the heat in the exhaust gas of the compressor 1 is recovered by the second plate heat exchanger 7 and the electric water heater 14 in the second circulation loop on the battery thermal management pipeline is heated, so that the water temperature circulating through the battery pack 12 rises to the target water temperature, thereby achieving battery heating;

[0060] The refrigerant flow direction of the cooling and cabin heating mode system is as follows: the exhaust port of compressor 1, the AB port of the electric proportional three-way valve 2 and the AC port of the electric proportional three-way valve 2 to the second plate heat exchanger 7, the DC port of the four-way valve 3, the outdoor heat exchanger 4, the first electronic expansion valve 8, the indoor heat exchanger 5, the ES port of the four-way valve 3, the gas-liquid separator 25, and the air intake port of compressor 1; the heat in the exhaust gas of compressor 1 is recovered through the second plate heat exchanger 7 and the electric water heater 14 in the cabin heating circulation pipeline is heated, so that the water temperature on the heating side rises to the target water temperature, and heat is supplied to the wall-mounted radiator 13.

[0061] When the air conditioning system is in the heating and single cooler mode or the heating and battery cooling mode, the four-way valve 3 is energized, the DE port and the CS port of the four-way valve 3 are connected, and the AB port of the electric proportional three-way valve 2 is connected;

[0062] The refrigerant flow directions of the heating and single cooler mode systems are: the exhaust port of the compressor 1, the DE port of the four-way valve 3, one way through the in-vehicle heat exchanger 5 to the first electronic expansion valve 8 and another way through the single cooler 11 to the third electronic expansion valve 10, the outdoor heat exchanger 4, the CS port of the four-way valve 3, the gas-liquid separator 25, and the air intake port of the compressor 1;

[0063] The refrigerant flow directions of the heating and battery cooling mode system are as follows: the exhaust port of the compressor 1, the DE port of the four-way valve 3, the in-vehicle heat exchanger 5, one path through the first electronic expansion valve 8 to the external heat exchanger 4 to the CS port of the four-way valve 3 and another path through the first one-way valve 15 to the second electronic expansion valve 9 to the first plate heat exchanger 6, the gas-liquid separator 25, and the air intake port of the compressor 1. After the refrigerant reaches the first plate heat exchanger 6, it absorbs the heat conducted by the battery pack 12 through the first circulation loop on the battery thermal management pipeline to achieve the battery cooling function.

[0064] When the air conditioning system is in the heating and battery heating mode or the heating and cabin heating mode, the four-way valve 3 is energized, the DE port and the CS port of the four-way valve 3 are connected, and the AB port and the AC port of the electric proportional three-way valve 2 are connected at the same time;

[0065] The refrigerant flow direction of the heating and battery heating mode system is as follows: the exhaust port of the compressor 1, the AB port of the electric proportional three-way valve 2 and the AC port of the electric proportional three-way valve 2 to the second plate heat exchanger 7, the DE port of the four-way valve 3, the in-vehicle heat exchanger 5, the first electronic expansion valve 8, the out-vehicle heat exchanger 4, the CS port of the four-way valve 3, the gas-liquid separator 25, and the air intake port of the compressor 1; the heat in the exhaust gas of the compressor 1 is recovered by the second plate heat exchanger 7 and the electric water heater 14 in the second circulation loop on the battery thermal management pipeline is heated, so that the water temperature circulating through the battery pack 12 rises to the target water temperature, thereby achieving battery heating;

[0066] The refrigerant flow direction of the heating and cabin heating mode system is as follows: the exhaust port of compressor 1, the AB port of the electric proportional three-way valve 2 and the AC port of the electric proportional three-way valve 2 to the second plate heat exchanger 7, the DE port of the four-way valve 3, the in-vehicle heat exchanger 5, the first electronic expansion valve 8, the outdoor heat exchanger 4, the CS port of the four-way valve 3, the gas-liquid separator 25, and the suction port of compressor 1. The heat in the exhaust gas of compressor 1 is recovered through the second plate heat exchanger 7 and heated by the electric water heater 14 in the cabin heating circulation pipeline, so that the water temperature on the heating side rises to the target water temperature to provide heat to the wall-mounted radiator 13.

[0067] When the air conditioning system is in the dehumidification mode, the four-way valve 3 is not energized, the DC port and ES port of the four-way valve 3 are connected, the AB port and AC port of the electric proportional three-way valve 2 are connected at the same time, and the third electric two-way valve 19 is opened; the system refrigerant flows in the following order: the exhaust port of the compressor 1, the AB port of the electric proportional three-way valve 2 and the AC port of the electric proportional three-way valve 2 to the second plate heat exchanger 7, the DC port of the four-way valve 3, the outdoor heat exchanger 4, one way through the first electronic expansion valve 8 to the indoor heat exchanger 5 and the other way through the third electronic expansion valve 10 to the single cooler 11, the ES port of the four-way valve 3, the gas-liquid separator 25, and the air intake port of the compressor 1; the heat in the exhaust gas of the compressor 1 is recovered through the second plate heat exchanger 7 and the electric water heater 14 in the car heating circulation pipeline is heated, so that the water temperature on the heating side rises to the target water temperature to provide heat to the wall-mounted radiator 13.

[0068] Figure 1 This is a system schematic diagram of a multifunctional one-to-four integrated vehicle air conditioning system and control method. This system diagram is a single compressor system. The main components include a compressor, a gas-liquid separator, two plate heat exchangers, a four-way valve, three electronic expansion valves, an electric proportional three-way valve, two one-way valves, an outdoor heat exchanger, an indoor heat exchanger, a single cooler, two circulating water pumps, two expansion water tanks, an electric water heater, a wall-mounted radiator, and four electric two-way valves. The positions of each component are shown in the figure. The following are several modes of the system when it is working:

[0069] 1. Refrigeration + single cooler mode: In this mode, the four-way valve 3 is not energized (D port → C port, E port → S port are connected), and the A port → B port of the electric proportional three-way valve 2 is connected. After startup, the system controller collects the temperature inside the vehicle t1, the temperature outside the vehicle t2, and the set temperature t3 to obtain the initial compressor speed R and the fan speed F. Then, by collecting the inner disk temperature, outer disk temperature, exhaust temperature, and intake temperature, the air conditioning system automatically adjusts the compressor speed R, the fan speed F, and the opening of the electronic expansion valve 1 K1 to adjust the temperature inside the vehicle t1 = the set temperature t3. At the same time, the system controller collects the cab temperature t1', the set temperature t3', and controls the opening K3 of the electronic expansion valve 3 to meet the temperature requirements of the cab or other areas. This set temperature t3' can be different from the set temperature t3 to achieve separate management. The system refrigerant flow direction is as follows: Figure 2 As shown: compressor 1 (exhaust port) → four-way valve 3 (D port → C port) → outdoor heat exchanger 4 → [first electronic expansion valve 8 → indoor heat exchanger 5] and [third electronic expansion valve 10 → single cooler 11] → four-way valve 3 (E port → S port) → gas-liquid separator 25 → compressor 1 (intake port).

[0070] 2. Refrigeration + battery cooling mode: In this mode, the four-way valve 3 is not energized (D port → C port, E port → S port are connected), the A port → B port of the electric proportional three-way valve 2 is connected, the first electric two-way valve 17 is opened, the second electric two-way valve 18 is closed, the third electric two-way valve 19 is closed, and the fourth electric two-way valve 20 is closed. After startup, the system controller collects the indoor temperature t1, the outdoor temperature t2, the set temperature t3, and the vehicle BMS feedback signal, and automatically obtains the compressor initial speed R and the fan speed F. Then, by collecting the inner disk temperature, the outer disk temperature, the exhaust temperature, and the suction temperature, the system automatically adjusts the compressor speed R, the fan speed F and the opening K1 of the electronic expansion valve 1 to adjust the indoor temperature t1=the set temperature t3. The system controller simultaneously controls the first circulation pump 21 to start, and adjusts the target opening K2 of the second electronic expansion valve 9 in combination with the return water temperature tw1 and the outlet water temperature tw2 of the first plate heat exchanger 6 in addition to the refrigerant system parameters, so that the water temperature on the battery side drops to the target water temperature, thereby cooling the battery. Figure 3 As shown: compressor 1 (exhaust port) → four-way valve 3 (D port → C port) → outdoor heat exchanger 4 → [first electronic expansion valve 8 → indoor heat exchanger 5 → four-way valve 3 (E port → S port)] and [second one-way valve 16 → second electronic expansion valve 9 → first plate heat exchanger 6] → gas-liquid separator 25 → compressor 1 (intake port).

[0071] 3. Cooling + battery heating mode: In this mode, the four-way valve 3 is not energized (D port→C port, E port→S port are connected), the A port→B port and A port→C port of the electric proportional three-way valve 2 are connected at the same time, the first electric two-way valve 17 is closed, the second electric two-way valve 18 is opened, the third electric two-way valve 19 is closed, and the fourth electric two-way valve 20 is opened. After startup, the system controller collects the indoor temperature t1, the outdoor temperature t2, and the set temperature t3. The system automatically obtains the initial compressor speed R and the fan speed F. Then, by collecting the inner disk temperature, the outer disk temperature, the exhaust temperature, and the suction temperature, the system automatically adjusts the compressor speed R, the fan speed F and the opening K1 of the first electronic expansion valve 8 to adjust the indoor temperature t1=the set temperature t3. The system controller controls the second circulation pump 23 to start at the same time. In addition to the refrigerant system parameters, the return water temperature tw3 and the outlet water temperature tw4 of the second plate heat exchanger 7 are combined to adjust the opening of the electric proportional three-way valve 2 from port A to port B and port A to port C. The heat in the compressor exhaust is recovered by the second plate heat exchanger 7 and heated by the electric water heater 14, so that the water temperature on the battery side rises to the target water temperature to provide heat to the battery. Figure 4 As shown: compressor 1 (exhaust port) → [electric proportional three-way valve 2 (port A → port B)] and [electric proportional three-way valve 2 (port A → port C) → second plate heat exchanger 7] → four-way valve 3 (port D → port C) → outdoor heat exchanger 4 → first electronic expansion valve 8 → indoor heat exchanger 5 → four-way valve 3 (port E → port S) → gas-liquid separator 25 → compressor 1 (intake port).

[0072] 4. Cooling + cabin heating mode: In this mode, the four-way valve 3 is not energized (D port→C port, E port→S port are connected), the A port→B port and A port→C port of the electric proportional three-way valve 2 are connected at the same time, the first electric two-way valve 17 is closed, the second electric two-way valve 18 is closed, the third electric two-way valve 19 is opened, and the fourth electric two-way valve 20 is closed. After startup, the system controller collects the indoor temperature t1, the outdoor temperature t2, and the set temperature t3, and the system obtains the initial compressor speed R and the fan speed F. Then, by collecting the inner disk temperature, the outer disk temperature, the exhaust temperature, and the suction temperature, the system automatically adjusts the compressor speed R, the fan speed F and the opening K1 of the first electronic expansion valve 8 to adjust the indoor temperature t1=the set temperature t3. The system controller controls the second circulation pump 23 to start at the same time, and adjusts the opening of the electric proportional three-way valve 2 from port A to port B and port A to port C in combination with the return water temperature tw3 and the outlet water temperature tw4 of the second plate heat exchanger 7 in addition to the refrigerant system parameters. The heat in the exhaust gas of the compressor 1 is recovered by the second plate heat exchanger 7 and heated by the electric water heater 14, so that the water temperature on the heating side rises to the target water temperature and supplies heat to the wall-mounted radiator 13. The system refrigerant flows as follows Figure 5As shown: compressor 1 (exhaust port) → [electric proportional three-way valve 2 (port A → port B)] and [electric proportional three-way valve 2 (port A → port C) → second plate heat exchanger 7] → four-way valve 3 (port D → port C) → outdoor heat exchanger 4 → first electronic expansion valve 8 → indoor heat exchanger 5 → four-way valve 3 (port E → port S) → gas-liquid separator 25 → compressor 1 (intake port).

[0073] 5. Heating + single cooler mode: In this mode, the four-way valve 3 is energized (D port → E port, C port → S port are connected), and the electric proportional three-way valve 2's A port → B port are connected. After startup, the system controller collects the vehicle's indoor temperature t1, the vehicle's outdoor temperature t2, and the set temperature t3, and obtains the initial compressor speed R and the fan speed F. Then, by collecting the inner disk temperature, outer disk temperature, exhaust temperature, and intake temperature, the system automatically adjusts the compressor speed R, the fan speed F, and the opening K1 of the first electronic expansion valve 8 to adjust the vehicle's indoor temperature t1 = the set temperature t3. At the same time, the system controller collects the cab temperature t1', the set temperature t3', and controls the opening K3 of the third electronic expansion valve 10 to meet the temperature requirements of the cab or other areas. This set temperature t3' can be different from the set temperature t3 to achieve separate management. The system refrigerant flow direction is as follows: Figure 6 As shown: compressor 1 (exhaust port) → four-way valve 3 (D port → E port) → [in-vehicle heat exchanger 5 → first electronic expansion valve 8] and [single cooler 11 → third electronic expansion valve 10] → outdoor heat exchanger 4 → four-way valve 3 (C port → S port) → gas-liquid separator 25 → compressor 1 (intake port).

[0074] 6. Heating + battery cooling mode: In this mode, the four-way valve 3 is energized (D port → E port, C port → S port are connected), the A port → B port of the electric proportional three-way valve 2 is connected at the same time, the first electric two-way valve 17 is opened, the second electric two-way valve 18 is closed, the third electric two-way valve 19 is closed, and the fourth electric two-way valve 20 is closed. After startup, the system controller collects the indoor temperature t1, the outdoor temperature t2, the set temperature t3, and the vehicle BMS feedback signal, and automatically obtains the compressor initial speed R and the fan speed F. Then, by collecting the inner disk temperature, the outer disk temperature, the exhaust temperature, and the intake temperature, the system automatically adjusts the compressor speed R, the fan speed F and the opening K1 of the first electronic expansion valve 8 to adjust the indoor temperature t1=the set temperature t3. The system controller simultaneously controls the first circulation pump 21 to start, and adjusts the target opening K2 of the second electronic expansion valve 9 in combination with the return water temperature tw1 and the outlet water temperature tw2 of the first plate heat exchanger 6 in addition to the refrigerant system parameters, so that the water temperature on the battery side drops to the target water temperature, thereby cooling the battery. Figure 7As shown: compressor 1 (exhaust port) → four-way valve 3 (D port → E port) → in-vehicle heat exchanger 5 → [first electronic expansion valve 8 → out-of-vehicle heat exchanger 4 → four-way valve 3 (C port → S port)] and [first check valve 15 → second electronic expansion valve 9 → first plate heat exchanger 6] → gas-liquid separator 25 → compressor 1 (intake port).

[0075] 7. Heating + battery heating mode: In this mode, the four-way valve 3 is energized (D port→E port, C port→S port are connected), the A port→B port and A port→C port of the electric proportional three-way valve 2 are connected at the same time, the first electric two-way valve 17 is closed, the second electric two-way valve 18 is opened, the third electric two-way valve 19 is closed, and the fourth electric two-way valve 20 is opened. After startup, the system controller collects the indoor temperature t1, the outdoor temperature t2, and the set temperature t3, and automatically obtains the initial compressor speed R and the fan speed F. Then, by collecting the inner disk temperature, the outer disk temperature, the exhaust temperature, and the suction temperature, the system automatically adjusts the compressor speed R, the fan speed F and the opening K1 of the first electronic expansion valve 8 to adjust the indoor temperature t1=the set temperature t3. The system controller controls the second circulation pump 23 to start at the same time. In addition to the refrigerant system parameters, the return water temperature tw3 and the outlet water temperature tw4 of the second plate heat exchanger 7 are combined to adjust the opening of the electric proportional three-way valve 2 from port A to port B and port A to port C. The heat in the exhaust gas of the compressor 1 is recovered by the second plate heat exchanger 7 and heated by the electric water heater 14, so that the water temperature on the battery side rises to the target water temperature to provide heat to the battery. Figure 8 As shown: compressor 1 (exhaust port) → [electric proportional three-way valve 2 (port A → port B)] and [electric proportional three-way valve 2 (port A → port C) → second plate heat exchanger 7] → four-way valve 3 (port D → port E) → in-vehicle heat exchanger 5 → first electronic expansion valve 8 → out-vehicle heat exchanger 4 → four-way valve 3 (port C → port S) → gas-liquid separator 25 → compressor 1 (intake port).

[0076] 8. Heating + cabin heating mode: In this mode, the four-way valve is energized (D port → E port, C port → S port are connected), the A port → B port and the A port → C port of the electric proportional three-way valve 2 are connected at the same time, the first electric two-way valve 17 is closed, the second electric two-way valve 18 is closed, the third electric two-way valve 19 is opened, and the fourth electric two-way valve 20 is closed. After startup, the system controller collects the indoor temperature t1, the outdoor temperature t2, and the set temperature t3 to obtain the initial compressor speed R and the fan speed F, and then by collecting the inner disk temperature, the outer disk temperature, the exhaust temperature, and the suction temperature, the system automatically adjusts the compressor speed R, the fan speed F and the opening K1 of the electronic expansion valve 1 to adjust the indoor temperature t1=the set temperature t3. The system controller controls the second circulation pump 23 to start at the same time, and adjusts the opening of the electric proportional three-way valve 2 from port A to port B and port A to port C in combination with the return water temperature tw3 and the outlet water temperature tw4 of the second plate heat exchanger 7 in addition to the refrigerant system parameters. The heat in the compressor exhaust is recovered by the second plate heat exchanger 7 and heated by the electric water heater 14, so that the water temperature on the heating side rises to the target water temperature and supplies heat to the wall-mounted radiator 13. The system refrigerant flows as follows Fig. 9 As shown: compressor 1 (exhaust port) → [electric proportional three-way valve 2 (port A → port B)] and [electric proportional three-way valve 2 (port A → port C) → second plate heat exchanger 7] → four-way valve 3 (port D → port E) → in-vehicle heat exchanger 5 → first electronic expansion valve 8 → out-vehicle heat exchanger 4 → four-way valve 3 (port C → port S) → gas-liquid separator 25 → compressor 1 (intake port).

[0077] 9. Dehumidification mode: In this mode, the four-way valve is not energized (D port→C port, E port→S port are connected), the electric proportional three-way valve A port→B port, A port→C port are connected at the same time, the first electric two-way valve 17 is closed, the second electric two-way valve 18 is closed, the third electric two-way valve 19 is opened, and the fourth electric two-way valve 20 is closed. After startup, the system controller collects the interior temperature t1, the exterior temperature t2, the interior humidity RH1, the set temperature t3, and the set humidity RH2 to obtain the initial compressor speed R' and the fan speed F', and then by collecting the inner disk temperature, outer disk temperature, exhaust temperature, and suction temperature, the system corrects the operating parameters through the PID algorithm, automatically adjusts the compressor speed R, the fan speed F and the opening K1 of the first electronic expansion valve 8 and the opening K3 of the third electronic expansion valve 10, and adjusts the interior humidity RH1=the set temperature RH2. If the temperature inside the vehicle is lower than the set temperature, the system controller will control the second circulation pump 23 to start at the same time. In addition to the refrigerant system parameters, the return water temperature tw3 and the outlet water temperature tw4 of the second plate heat exchanger 7 are combined to adjust the opening of the electric proportional three-way valve 2 from port A to port B and port A to port C. The heat in the exhaust gas of the compressor is recovered by the second plate heat exchanger 7 and heated by the electric water heater 14, so that the water temperature on the heating side rises to the target water temperature, and heats the wall-mounted radiator 13, adjusting the temperature inside the vehicle t1 to the set temperature t3. The system refrigerant flows as follows: Fig.10As shown: compressor 1 (exhaust port) → [electric proportional three-way valve 2 (port A → port B)] and [electric proportional three-way valve 2 (port A → port C) → second plate heat exchanger 7] → four-way valve 3 (port D → port C) → outdoor heat exchanger 4 → [first electronic expansion valve 8 → indoor heat exchanger 5] and [third electronic expansion valve 10 → single cooler 11] → four-way valve 3 (port E → port S) → gas-liquid separator 25 → compressor 1 (intake port).

[0078] The air-conditioning system of the present invention installs a plate heat exchanger between the compressor and the four-way valve, which can be used to recover the heat of the compressor exhaust and then transfer the heat to the battery side or the radiator side through the refrigerant. When the air-conditioning system operates in the cooling mode, the heat in the compressor exhaust is preferentially used to meet the heat demand of some areas of the vehicle without the need for electric heating or fuel heating to cause additional energy consumption of the entire vehicle. At the same time, the application of the plate heat exchanger increases the heat exchange effect of the condenser, further improving the energy efficiency of the entire vehicle.

[0079] The air-conditioning system has added an electric proportional three-way valve between the compressor and the four-way valve. This valve can accurately adjust the refrigerant flow entering the plate heat exchanger according to energy requirements, control the plate heat exchanger water temperature, and make the heating of the entire vehicle stable and reliable.

[0080] The air-conditioning system has added the use of single coolers between the evaporation side and the condensation side. This can solve the problem that when the air duct installation of the vehicle is long or the vehicle has a special structure and the cold or heat is difficult to deliver, the single cooler can be used to supply cooling and heating to these areas separately. The number of single coolers can also be increased as needed to meet different functional requirements.

[0081] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, which should also be regarded as the scope of protection of the present invention.

Claims

1. A vehicle air conditioning system, characterized in that: The system comprises an air conditioning circulation pipeline, a battery thermal management pipeline and a cabin heating circulation pipeline; the battery thermal management pipeline and the air conditioning circulation pipeline respectively exchange heat through a first plate heat exchanger (6) and a second plate heat exchanger (7); the cabin heating circulation pipeline and the air conditioning circulation pipeline exchange heat through the second plate heat exchanger (7); The air conditioning circulation pipeline comprises a compressor (1), an electric proportional three-way valve (2), a first plate heat exchanger (6), a second plate heat exchanger (7), a four-way valve (3), an off-board heat exchanger (4), a first electronic expansion valve (8), a second electronic expansion valve (9), a third electronic expansion valve (10), a single cooler (11), a first non-return valve (15), a second non-return valve (16), an on-board heat exchanger (5) and a gas-liquid separator (25); the exhaust port of the compressor (1) is connected to the A port of the electric proportional three-way valve (2) through a pipeline, the B port of the electric proportional three-way valve (2) is connected to the D port of the four-way valve (3) through a pipeline, the C port of the electric proportional three-way valve (2) is connected to the first inlet of the second plate heat exchanger (7), the outlet of the second plate heat exchanger (7) is connected to the D port of the four-way valve (3) through a pipeline, and the C port of the four-way valve (3) is connected to the first inlet of the second plate heat exchanger (7). The pipeline is connected to one end of the off-board heat exchanger (4), and the other end of the off-board heat exchanger (4) is divided into three paths. The first path is connected in sequence to the third electronic expansion valve (10), the single cooler (11) and the E port of the four-way valve (3); the second path is connected to the second non-return valve (16), the second electronic expansion valve (9), the first inlet of the first plate heat exchanger (6), the first outlet of the first plate heat exchanger (6) and the gas-liquid separator (25); the third path is connected in sequence to the first electronic expansion valve (8) and one end of the on-board heat exchanger (5); the other end of the on-board heat exchanger (5) is connected to the E port of the four-way valve (3) through the pipeline, the S port of the four-way valve (3) is connected to one end of the gas-liquid separator (25), and the other end of the gas-liquid separator (25) is connected to the air intake port of the compressor (1); and a first non-return valve (15) is also provided between the on-board heat exchanger (5) and the second electronic expansion valve; The battery thermal management pipeline comprises a first circulation loop and a second circulation loop; the first circulation loop comprises a first expansion water tank (22), a first circulation pump (21), a first electric two-way valve (17) and a battery pack (12); the second outlet of the first plate heat exchanger (6) is connected in sequence with the expansion water tank, the first circulation pump (21), the first electric two-way valve (17), the battery pack (12) and the second inlet of the first plate heat exchanger (6) to form the first circulation loop; the second circulation loop comprises an electric water heater (14), a second expansion water tank (24), a second circulation pump (23), a second electric two-way valve (18), the battery pack (12) and a fourth electric two-way valve (20); the second outlet of the second plate heat exchanger (7), the electric water heater (14), the second expansion water tank (24), the second circulation pump (23), the second electric two-way valve (18), the battery pack (12), the fourth electric two-way valve (20) and the second inlet of the second plate heat exchanger (7) are connected in sequence to form the second circulation loop; An exhaust temperature sensor is provided at the exhaust port of the compressor (1), an intake temperature sensor is provided at the intake port, an external disk temperature sensor is provided at the external heat exchanger (4), a first internal disk temperature sensor is provided on the internal heat exchanger (5), a second internal disk temperature sensor is provided on the single cooler (11), a second water outlet temperature sensor is provided at the second outlet of the first plate heat exchanger (6), a first return water temperature sensor is provided at the second inlet of the first plate heat exchanger (6), a first water outlet temperature sensor is provided between the electric water heater (14) and the second expansion water tank (24), and a second return water temperature sensor is provided at the second inlet of the second plate heat exchanger (7).

2. The vehicle air conditioning system according to claim 1, characterized in that: The carriage heating circulation pipeline comprises an electric water heater (14), a second expansion water tank (24), a second circulation pump (23), a third electric two-way valve (19), and a wall-mounted radiator (13); the second outlet of the second plate heat exchanger (7), the electric water heater (14), the second expansion water tank (24), the second circulation pump (23), the third electric two-way valve (19), the wall-mounted radiator (13), and the second inlet of the second plate heat exchanger (7) are connected in sequence to form a circulation loop.

3. A control method for a vehicle air conditioning system according to any one of claims 1 to 2, characterized in that: The control method includes the following working modes: cooling and cooler mode, cooling and battery cooling mode, cooling and battery heating mode, cooling and cabin heating mode, heating and cooler mode, heating and battery cooling mode, heating and battery heating mode, heating and cabin heating mode, dehumidification mode; When the air conditioning system is in the cooling and single cooler mode or the cooling and battery cooling mode, the four-way valve (3) is not energized, the DC port and the ES port of the four-way valve (3) are connected, and the AB port of the electric proportional three-way valve (2) is connected: The refrigerant flow direction of the system in the refrigeration and single cooler (11) modes is, in order, the exhaust port of the compressor (1), the AB port of the electric proportional three-way valve (2), the DC port of the four-way valve (3), the off-vehicle heat exchanger (4), one way through the first electronic expansion valve (8) to the on-vehicle heat exchanger (5) and another way through the third electronic expansion valve (10) to the single cooler (11), the ES port of the four-way valve (3), the gas-liquid separator (25), and the air intake port of the compressor (1); The system refrigerant flow direction of the refrigeration and battery cooling mode is, in order, the exhaust port of the compressor (1), the AB port of the electric proportional three-way valve (2), the DC port of the four-way valve (3), the off-vehicle heat exchanger (4), one way through the first electronic expansion valve (8) to the on-vehicle heat exchanger (5) to the ES port of the four-way valve (3), and another way through the second one-way valve (16) to the second electronic expansion valve (9) to the first plate heat exchanger (6), the gas-liquid separator (25), and the air intake port of the compressor (1); after the refrigerant reaches the first plate heat exchanger (6), it absorbs the heat conducted by the battery pack (12) through the first circulation loop on the battery thermal management pipeline, thereby realizing the refrigeration and battery cooling functions.

4. The control method of the vehicle air conditioning system according to claim 3, characterized in that: When the air conditioning system is in a cooling and battery heating mode or a cooling and cabin heating mode, the four-way valve (3) is not energized, the DC port and the ES port of the four-way valve (3) are connected, and the AB port and the AC port of the electric proportional three-way valve (2) are connected at the same time; The refrigerant flow direction of the cooling and battery heating mode system is as follows: the exhaust port of the compressor (1), the AB port of the electric proportional three-way valve (2) and the AC port of the electric proportional three-way valve (2) to the second plate heat exchanger (7), the DC port of the four-way valve (3), the off-vehicle heat exchanger (4), the first electronic expansion valve (8), the on-vehicle heat exchanger (5), the ES port of the four-way valve (3), the gas-liquid separator (25), and the air intake port of the compressor (1); the heat in the exhaust gas of the compressor (1) is recovered by the second plate heat exchanger (7) and the electric water heater (14) in the second circulation loop on the battery thermal management pipeline is heated, so that the water temperature circulating through the battery pack (12) rises to the target water temperature, thereby achieving battery heating; The refrigerant flow direction of the cooling and cabin heating mode system is as follows: the exhaust port of the compressor (1), the AB port of the electric proportional three-way valve (2) and the AC port of the electric proportional three-way valve (2) to the second plate heat exchanger (7), the DC port of the four-way valve (3), the outdoor heat exchanger (4), the first electronic expansion valve (8), the indoor heat exchanger (5), the ES port of the four-way valve (3), the gas-liquid separator (25), and the air intake port of the compressor (1); the heat in the exhaust gas of the compressor (1) is recovered by the second plate heat exchanger (7) and heated by the electric water heater (14) in the cabin heating circulation pipeline, so that the water temperature on the heating side rises to the target water temperature, and heat is supplied to the wall-mounted radiator (13).

5. The control method of the vehicle air conditioning system according to claim 3, characterized in that: When the air conditioning system is in the heating and single cooler mode or the heating and battery cooling mode, the four-way valve (3) is energized, the DE port of the four-way valve (3) is connected to the CS port, and the AB port of the electric proportional three-way valve (2) is connected; The refrigerant flow directions of the heating and single cooler mode systems are: the exhaust port of the compressor (1), the DE port of the four-way valve (3), the in-vehicle heat exchanger (5) to the first electronic expansion valve (8) and the single cooler (11) to the third electronic expansion valve (10), the outdoor heat exchanger (4), the CS port of the four-way valve (3), the gas-liquid separator (25), and the air intake port of the compressor (1); The refrigerant flow direction of the heating and battery cooling mode system is as follows: the exhaust port of the compressor (1), the DE port of the four-way valve (3), the in-vehicle heat exchanger (5), the first electronic expansion valve (8) to the out-vehicle heat exchanger (4) to the CS port of the four-way valve (3) and the first one-way valve (15) to the second electronic expansion valve (9) to the first plate heat exchanger (6), the gas-liquid separator (25), and the air intake port of the compressor (1). After the refrigerant reaches the first plate heat exchanger (6), it absorbs the heat conducted by the battery pack (12) through the first circulation loop on the battery thermal management pipeline, thereby realizing the battery cooling function.

6. The control method of the vehicle air conditioning system according to claim 3, characterized in that: When the air conditioning system is in the heating and battery heating mode or the heating and cabin heating mode, the four-way valve (3) is energized, the DE port and the CS port of the four-way valve (3) are connected, and the AB port and the AC port of the electric proportional three-way valve (2) are connected at the same time; The refrigerant flow direction of the heating and battery heating mode system is as follows: the exhaust port of the compressor (1), the AB port of the electric proportional three-way valve (2) and the AC port of the electric proportional three-way valve (2) to the second plate heat exchanger (7), the DE port of the four-way valve (3), the in-vehicle heat exchanger (5), the first electronic expansion valve (8), the out-vehicle heat exchanger (4), the CS port of the four-way valve (3), the gas-liquid separator (25), and the air intake port of the compressor (1); the heat in the exhaust gas of the compressor (1) is recovered by the second plate heat exchanger (7) and the electric water heater (14) in the second circulation loop on the battery thermal management pipeline is heated, so that the water temperature circulating through the battery pack (12) rises to the target water temperature, thereby achieving battery heating; The refrigerant flow direction of the heating and cabin heating mode system is as follows: the exhaust port of the compressor (1), the AB port of the electric proportional three-way valve (2) and the AC port of the electric proportional three-way valve (2) to the second plate heat exchanger (7), the DE port of the four-way valve (3), the in-vehicle heat exchanger (5), the first electronic expansion valve (8), the out-vehicle heat exchanger (4), the CS port of the four-way valve (3), the gas-liquid separator (25), and the air intake port of the compressor (1). The heat in the exhaust gas of the compressor (1) is recovered by the second plate heat exchanger (7) and heated by the electric water heater (14) in the cabin heating circulation pipeline, so that the water temperature on the heating side rises to the target water temperature, and heat is supplied to the wall-mounted radiator (13).

7. The control method of the vehicle air conditioning system according to claim 3, characterized in that: When the air conditioning system is in the dehumidification mode, the four-way valve (3) is not energized, the DC port and the ES port of the four-way valve (3) are connected, the AB port and the AC port of the electric proportional three-way valve (2) are connected at the same time, and the third electric two-way valve (19) is opened; the refrigerant in the system flows in the following order: the exhaust port of the compressor (1), the AB port of the electric proportional three-way valve (2) and the AC port of the electric proportional three-way valve (2) to the second plate heat exchanger (7), the DC port of the four-way valve (3), the external heat exchanger (7) and the external heat exchanger (7). The heat exchanger (4), the first electronic expansion valve (8) to the in-car heat exchanger (5) and the third electronic expansion valve (10) to the single cooler (11), the ES port of the four-way valve (3), the gas-liquid separator (25), and the air intake port of the compressor (1); the heat in the exhaust gas of the compressor (1) is recovered by the second plate heat exchanger (7) and the electric water heater (14) in the car heating circulation pipeline is heated, so that the water temperature on the heating side is raised to the target water temperature, and heat is supplied to the wall-mounted radiator (13).

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