Electric vehicle heat pump air conditioning system and control logic

Abstract

An electric vehicle heat pump air conditioning system includes a cooling and heating unit, an intermediate heat exchanger, a battery cooling and heat recovery unit, a motor radiator, and an electronically controlled radiator. The electric compressor of the cooling and heating unit is connected to an indoor heat exchanger and an outdoor heat exchanger, as well as a gas-liquid separator. The intermediate heat exchanger is connected to both the gas-liquid separator and the indoor heat exchanger to form a refrigerant circuit. The battery is connected to the intermediate heat exchanger via piping to form a water circuit. The battery cooling and heat recovery unit cools the battery and absorbs heat from the battery pack, transferring it to the intermediate heat exchanger. The motor radiator and electronically controlled radiator absorb heat from the motor and transfer it to the intermediate heat exchanger. The PTC (Power Transmission Control Unit) is separately connected in the air conditioning system circuit. This invention eliminates the need to activate the PTC heating unit at temperatures above -10°C, saving energy and significantly improving the driving range of electric vehicles in winter.

Description

Technical Field

[0001] The present invention relates to automobile air conditioners, and in particular to an electric automobile air conditioner system and control logic. Background Art

[0002] The automobile air conditioning system is an important guarantee system to ensure the comfort of the driver and passengers in the car. The traditional fuel automobile air conditioning system is driven by the automobile engine, which consumes fuel to provide the power required by the air conditioning system, cooling the car in summer and heating the car in winter using the engine waste heat. Electric vehicles are vehicles that use electricity as the power source of the driving system in whole or in part, especially pure electric drive electric vehicles. Since there is no engine waste heat to use, it is very important to solve the winter heating problem of electric vehicles.

[0003] At present, electric vehicles mainly use PTC (positive temperature coefficient) electric heating for winter heating, but PTC electric heating requires a large amount of electric energy stored in the electric vehicle battery, which will greatly shorten the driving distance of electric heavy trucks. In order to meet the heating needs in the low temperature environment outside the vehicle, it is hoped to provide an air conditioning heat pump technology solution that uses a low temperature air source, which can effectively cope with low temperature conditions outside the vehicle or outdoors that are lower than conventional low temperature conditions. Summary of the invention

[0004] The purpose of the present invention is to provide an electric vehicle heat pump air conditioning system, which, on the one hand, provides cooling and heating through an electric compressor, and on the other hand, provides heating inside the vehicle by absorbing heat from battery cooling, thereby improving both the heating efficiency and the cruising range of the electric vehicle.

[0005] The electric vehicle heat pump air conditioning system includes a cooling and heating unit, an intermediate heat exchanger, a PTC unit, a battery cooling and heat recovery unit, and a motor electronic control heat recovery unit, wherein the cooling and heating unit includes: an electric compressor 1, a gas-liquid separator 2, an outdoor heat exchanger 3, and an indoor heat exchanger 4. The electric compressor 1 is connected to the indoor heat exchanger 4 through an electromagnetic stop valve 2 5, and is connected to the outdoor heat exchanger 3 through an electromagnetic stop valve 1 6; the electric compressor 1 is connected to the gas-liquid separator 2 through a pipeline; the gas-liquid separator 2 is connected to the outdoor heat exchanger 3 through an electromagnetic stop valve 3 7, and is connected to the indoor heat exchanger 4 through an electromagnetic stop valve 4 8; the intermediate heat exchanger 20 is respectively connected to the gas-liquid separator 2 and the indoor heat exchanger 4 to form a refrigerant circuit;

[0006] Multiple groups of batteries are connected to the intermediate heat exchanger 20 through pipelines to form a water circuit, and a water pump is installed in the circuit of each group of batteries;

[0007] The battery cooling and heat recovery unit includes an electric compressor 10, a battery condenser 11, and an intermediate heat exchanger 12, wherein the electric compressor 10, the battery condenser 11, and the intermediate heat exchanger 12 are connected to each other through pipelines to form a loop, and the battery cooling and heat recovery unit is connected in parallel in the liquid circuit of the intermediate heat exchanger 20, and the circuits of the electric compressor 10 and the intermediate heat exchanger 12 are respectively equipped with a pressure sensor 3 40 and a throttling device 3 39; the circuits of the electric compressor 10 and the intermediate heat exchanger 12 are equipped with a pressure sensor 41.

[0008] The water circuit of the intermediate heat exchanger 20 is also connected in parallel with a motor radiator circuit, an electric control radiator circuit, and a motor electric control circuit.

[0009] The electric vehicle heat pump air conditioning system also includes a PTC heating unit, which is separately connected in the circuit of the air conditioning system.

[0010] A temperature detector 2 32 is installed on the circuit between the outdoor heat exchanger 3 and the indoor heat exchanger 4, a temperature detector 3 33 is installed on the circuit between the gas-liquid separator 2 and the indoor heat exchanger 4, a temperature detector 1 31 is installed on the output main circuit of the indoor heat exchanger 4, and a temperature detector 4 34 is installed on the circuit between the gas-liquid separator 2 and the intermediate heat exchanger 20; the temperature detectors respectively detect the temperature of the refrigerant in the circuit; a pressure sensor 35 is installed on the output main circuit of the electric compressor 1 for detecting the pressure of the gaseous refrigerant; a pressure sensor 2 36 is installed on the input main circuit of the gas-liquid separator for detecting the pressure of the liquid refrigerant; a throttling device 1 37 is installed on the output main circuit of the indoor heat exchanger, and a throttling device 2 38 is installed on the circuit between the indoor heat exchanger 4 and the intermediate heat exchanger 20; the throttling devices are respectively used to reduce the pressure of the refrigerant in the circuit.

[0011] The battery circuit is respectively equipped with water pump 1 51 and water pump 2 52; the motor electronic control 72 input main circuit is equipped with water pump 3 53; the water pumps are used for water circuit circulation; the motor radiator 1 70 and the intermediate heat exchanger 2 12 circuit are equipped with solenoid valve 1 61; the battery and the intermediate heat exchanger 2 12 circuit are equipped with solenoid valve 2 62; the motor radiator and the battery circuit are equipped with solenoid valve 3 63; the motor radiator and the electronic control radiator circuit are equipped with solenoid valve 4 64; the motor radiator input main circuit is equipped with solenoid valve 5 65; the electronic control radiator and the motor electronic control circuit are equipped with solenoid valve 6 66; the intermediate heat exchanger 1 20 and the motor electronic control 72 circuit are equipped with solenoid valve 7 67.

[0012] The control logic of the present invention is:

[0013] 1. When the outside temperature is lower than 10℃ and the water temperature in the motor-controlled radiator is higher than 20℃, the electric compressor starts to rotate and the waste heat recovery heating mode is turned on;

[0014] 2. When the outside temperature is lower than -10℃, all compressors are shut down, PTC starts to work, and PTC independent heating working mode is turned on;

[0015] 3. When the outside temperature is higher than 28℃, the temperature inside the car is lower than 20℃, and the water temperature inside the battery is higher than 30℃, the electric compressor 210 is turned on to cool the battery alone;

[0016] 4. When the outside temperature is lower than 2°C, the temperature inside the car is higher than 15°C, and the water temperature inside the battery is lower than 0°C, the electric compressor is turned on, and the high-temperature refrigerant discharged from the electric compressor is used to heat the battery alone;

[0017] 5. When the outside temperature is lower than 2°C and the temperature of the outdoor heat exchanger is lower than 0°C, the electric compressor starts and the outdoor heat exchanger defrosting mode is turned on;

[0018] 6. When the outside temperature is lower than 2℃, the temperature inside the car is higher than 15℃, the water temperature inside the battery is lower than 0℃, the water temperature inside the motor and electronic control system is higher than 20℃, and the water temperature inside the battery is lower than 0℃, the electric compressor rotates one by one, and the residual heat of the motor and electronic control radiator is turned on to heat the battery;

[0019] 7. When the outside temperature is lower than 10℃ and the fog in the car is heavy, the electric compressor starts, the PTC works, and the cockpit heating and defogging mode is turned on;

[0020] 8. When the outside temperature is higher than 28℃, the temperature inside the car is higher than 25℃, and the water temperature inside the battery is lower than 30℃, the electric compressor rotates one by one to start the cockpit cooling mode;

[0021] 9. When the outside temperature is lower than 10℃ and the water temperature in the motor electronically controlled radiator is higher than 15℃, the electric compressor 1 starts to rotate, and the waste heat recovery + intermediate heat exchanger 20 starts to work simultaneously in the heating mode;

[0022] 10. When the air temperature is lower than 10℃ and the water temperature in the motor-controlled radiator is lower than 15℃, the electric compressor 1 starts to rotate and the indoor heat exchanger 4 starts the heating working mode.

[0023] The positive effects of the present invention are as follows: the present invention solves the problem of reduced cruising range of electric vehicles caused by the previous heating of the interior of the electric vehicle only through the PTC unit, and heats the interior of the vehicle through the refrigeration unit, without turning on the PTC heating unit above -10°C; and the present invention can recycle the heat generated by the battery, the motor and the electronic control system to supplement the heat in the vehicle, greatly reducing the utilization rate of the PTC heating unit and increasing the cruising range of electric vehicles in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0025] The specific working process of the present invention is described below in conjunction with the accompanying drawings and various working conditions.

[0026] See attached Figure 1 , the various working modes of the present invention are as follows:

[0027] Heating working mode 1:

[0028] When the outside temperature is lower than 10℃ and the water temperature in the motor-controlled radiator is higher than 20℃, the electric compressor starts to rotate and the waste heat recovery heating mode is turned on;

[0029] First, electromagnetic stop valve 16 and electromagnetic stop valve 48 are closed, and electromagnetic stop valve 25 and electromagnetic stop valve 37 are opened; throttling device 238 is closed; electric compressor 1 is turned on, and its speed and PTC power are controlled according to the heat load. The lower the temperature inside the car, the lower the temperature of the temperature sensor on the indoor heat exchanger 4, the higher the speed of the electric compressor 1, and the greater the PTC power; throttling device 131 is controlled according to pressure sensor 135 and temperature sensor 131; frost control of outdoor heat exchanger 3 is based on temperature sensor 232 and pressure sensor 236. When the temperature of temperature sensor 232 is lower than 0℃ and pressure sensor 236 is lower than 0.08Mpa, hot refrigerant enters the outdoor heat exchanger 3 for defrosting; PTC is used as a backup method for heating the vehicle. When the environment is lower than -10℃ and there is no waste heat available, the PTC heating mode is turned on separately to heat the interior of the vehicle. During operation, the low-temperature and low-pressure gaseous refrigerant is compressed by the electric compressor 1 into a high-temperature and high-pressure gaseous refrigerant, and enters the indoor heat exchanger 4 through the electromagnetic stop valve 2 5. Here, the high-temperature and high-pressure gaseous refrigerant releases heat and cools into a high-temperature and high-pressure liquid, thereby achieving the purpose of heating the interior of the vehicle. The high-temperature and high-pressure refrigerant liquid is throttled and depressurized by the throttling device 1 37 to become a low-temperature and low-pressure liquid and gaseous mixed refrigerant, and then enters the outdoor air-cooled heat exchanger 3. The liquid refrigerant evaporates and absorbs the heat of the air outside the vehicle to become a low-temperature and low-pressure gaseous refrigerant, and then flows through the electromagnetic stop valve 3 7 and the gas-liquid separator 2 to return to the electric compressor 1 to complete the heating cycle. After throttling and cooling, the refrigerant enters the outdoor heat exchanger to absorb heat, which increases the heat absorption capacity of the refrigerant in the outdoor heat exchanger and improves the energy utilization efficiency of the heat pump system.

[0030] Heating working mode 2: waste heat recovery

[0031] When the outside temperature is lower than 10℃ and the water temperature in the motor-controlled radiator is higher than 15℃, the electric compressor 1 starts to rotate, and the waste heat recovery + indoor heat exchanger 4 starts to work simultaneously in the heating mode;

[0032] When the air temperature is lower than 10°C and the water temperature in the motor-controlled radiator is lower than 15°C, the electric compressor 1 starts to rotate and the indoor heat exchanger 4 starts the heating working mode.

[0033] At this time, the electromagnetic stop valve 16 and the electromagnetic stop valve 48 are closed, the electromagnetic stop valve 25 and the electromagnetic stop valve 37 are opened; the electromagnetic valve 767 is opened, the water pump 353 is opened, and whether the electromagnetic valve 66 is opened is determined according to the motor load; the electric compressor 1 controls the speed according to the heat load. The lower the temperature in the car, the lower the temperature of the temperature sensor on the indoor heat exchanger 4, and the higher the speed of the electric compressor 1; the throttling device 131 is controlled according to the pressure sensor 135 and the temperature sensor 131; the throttling device 238 is adjusted according to the water temperature signal, and the throttling device 238 is opened when the temperature in the motor electronic control reaches above 20°C; the throttling device 238 is closed when the temperature in the motor electronic control reaches below 20°C; the frost control of the outdoor heat exchanger 3 is based on the temperature sensor 232 and the pressure sensor 236. When the temperature of the temperature sensor 232 is lower than 0°C and the pressure sensor 236 is lower than 0.08Mpa, the hot refrigerant enters the outdoor heat exchanger 3 for defrosting; during operation, the low temperature The low-pressure gaseous refrigerant is compressed by the electric compressor 1 to become a high-temperature and high-pressure gaseous refrigerant, and enters the indoor heat exchanger through the electromagnetic stop valve 25, where the high-temperature and high-pressure gaseous refrigerant releases heat and cools to become a high-temperature and high-pressure liquid, thereby achieving the purpose of heating the vehicle; the high-temperature and high-pressure refrigerant liquid is throttled and reduced in pressure by the throttling element of the throttling device 31 to become a low-temperature and low-pressure liquid and gaseous mixed refrigerant, and a part of the refrigerant enters the outdoor air-cooled heat exchanger, and the liquid refrigerant evaporates and absorbs the heat of the air outside the vehicle to become a low-temperature and low-pressure gaseous refrigerant, and then flows through the electromagnetic stop valve 37 and the gas-liquid separator to return to the electric compressor 1, completing the heating cycle; the other part of the refrigerant is throttled and reduced in pressure by the throttling element of the throttling device 238, and enters the intermediate heat exchanger 20, and the liquid refrigerant evaporates, circulates through the water circuit, absorbs the heat of the motor radiator and the electronically controlled radiator, and becomes a low-temperature and low-pressure gaseous refrigerant, and then flows through the gas-liquid separator to return to the electric compressor 1, completing the heating cycle.

[0034] Heating working mode 3: waste heat recovery + intermediate heat exchanger 20 working simultaneously

[0035] When the outside temperature is lower than 10°C and the water temperature in the motor electronically controlled radiator is higher than 15°C, the electric compressor 1 starts to rotate, and the waste heat recovery + intermediate heat exchanger 20 starts to work simultaneously in the heating mode;

[0036] At this time, electromagnetic stop valve 1 6, electromagnetic stop valve 3 7, and electromagnetic stop valve 4 8 are closed, and electromagnetic stop valve 2 5 is opened; solenoid valve 7 67 is opened, water pump 3 53 is opened, and whether solenoid valve 6 76 is opened is determined according to the motor load; electric compressor 1 controls the speed according to the heat load; throttling device 2 38 is controlled according to pressure sensor 2 36 and temperature sensor 4 34.

[0037] The specific implementation method is as follows: in winter, the low-temperature and low-pressure gaseous refrigerant is compressed by the electric compressor 1 to become the high-temperature and high-pressure gaseous refrigerant, and enters the indoor heat exchanger through the electromagnetic stop valve 2, where the high-temperature and high-pressure gaseous refrigerant releases heat and cools to become a high-temperature and high-pressure liquid, thereby achieving the purpose of heating the vehicle; the high-temperature and high-pressure refrigerant liquid is throttled and reduced in pressure by the throttling element of the throttling device 2 38 to become a low-temperature and low-pressure liquid and gaseous mixed refrigerant, and then enters the intermediate heat exchanger 20, the liquid refrigerant evaporates, circulates through the water circuit, absorbs the heat of the motor and the electronic control system, and becomes a low-temperature and low-pressure gaseous refrigerant, and then flows through the gas-liquid separator back to the electric compressor 1 to complete the heating cycle.

[0038] Cockpit cooling working mode:

[0039] When the outside temperature is higher than 28℃, the temperature inside the car is higher than 25℃, and the water temperature inside the battery is lower than 30℃, the electric compressor rotates one by one to start the cockpit cooling mode;

[0040] At this time, the electromagnetic stop valve 2 5 and the electromagnetic stop valve 3 7 are closed, and the electromagnetic stop valve 1 6 and the electromagnetic stop valve 4 8 are opened; the electric compressor 1 controls the speed according to the heat load, the higher the temperature in the car, the higher the temperature of the temperature sensor on the indoor heat exchanger 4, the higher the speed of the electric compressor 1, the throttling device 1 31 is controlled according to the pressure sensor 2 36 and the temperature sensor 3 33, and the frosting control of the heat exchanger in the car is based on the temperature sensor of the heat exchanger in the car;

[0041] The specific implementation method is as follows: in the cooling mode (in summer), the low-temperature and low-pressure gaseous refrigerant is compressed by the electric compressor 1 into a high-temperature and high-pressure gaseous refrigerant, flows into the air-cooled outdoor heat exchanger through the electromagnetic stop valve 1, and becomes a supercooled high-pressure liquid after being cooled and condensed by the outdoor air, and then throttled and reduced in pressure by the throttling element of the throttling device 31. It becomes a low-temperature and low-pressure gas-liquid mixed refrigerant and enters the air-cooled indoor heat exchanger, where the liquid refrigerant absorbs heat and evaporates into a low-temperature and low-pressure gaseous refrigerant, achieving the purpose of cooling the interior of the vehicle; the low-temperature and low-pressure gaseous refrigerant returns to the electric compressor 1 through the electromagnetic stop valve 48 and the gas-liquid separator 2, completing the refrigeration cycle. After throttling and cooling, the refrigerant enters the heat exchanger in the vehicle to absorb heat, which increases the heat absorption capacity of the refrigerant in the heat exchanger in the vehicle, thereby improving the energy utilization efficiency of the heat pump system.

[0042] Cockpit heating and defogging working mode:

[0043] When the outside temperature is lower than 10℃ and the car is foggy, the electric compressor starts, the PTC works, and the cockpit heating and defogging mode is turned on;

[0044] At this time, the electromagnetic stop valve 2 5 and the electromagnetic stop valve 3 7 are closed, the electromagnetic stop valve 1 6 and the electromagnetic stop valve 4 8 are opened, the electric compressor 1 and the PTC control the speed according to the heat load, the throttling device 1 31 is controlled according to the pressure sensor 2 36 and the temperature sensor 3 33, and the frosting control of the in-vehicle heat exchanger is based on the in-vehicle heat exchanger temperature sensor;

[0045] The specific implementation method is as follows: the low-temperature and low-pressure gaseous refrigerant is compressed by the electric compressor 1 into a high-temperature and high-pressure gaseous refrigerant, flows into the air-cooled outdoor heat exchanger 3 through the electromagnetic stop valve 1, and becomes a supercooled high-pressure liquid after being cooled and condensed by the outdoor air, and then throttled and reduced in pressure through the throttling element of the throttling device 31. It becomes a low-temperature and low-pressure gas-liquid mixed refrigerant and enters the air-cooled indoor heat exchanger 4, where the liquid refrigerant absorbs heat and evaporates into a low-temperature and low-pressure gaseous refrigerant, achieving the purpose of reducing the humidity in the car; the low-temperature and low-pressure gaseous refrigerant returns to the electric compressor 1 through the electromagnetic stop valve 4 and the gas-liquid separator, completing the refrigeration and dehumidification cycle. In the heating and demisting working mode, the PTC is turned on to achieve the purpose of heating the air in the car.

[0046] Compressor cools the battery alone:

[0047] When the outside temperature is higher than 28℃, the temperature inside the car is lower than 20℃, and the water temperature inside the battery is higher than 30℃, the electric compressor 210 is turned on to cool the battery alone;

[0048] At this time, the electromagnetic valve 1 61 and the electromagnetic valve 3 63 are closed; the electromagnetic valve 2 62 is opened; the water pump 1 51 and the water pump 2 52 are opened, and the throttling device 3 39 is opened; the electric compressor 2 10 controls the speed according to the heat load; the opening degree of the throttling device 3 39 is controlled according to the pressure sensor 3 40 and the pressure sensor 4 41;

[0049] The specific implementation method is as follows: in the cooling mode (in summer), the low-temperature and low-pressure gaseous refrigerant is compressed by the electric compressor 2 10 into a high-temperature and high-pressure gaseous refrigerant, flows into the battery condenser, is cooled and condensed into a supercooled high-pressure liquid, and then throttled and reduced in pressure by the throttling element of the throttling device 3 39 to become a low-temperature and low-pressure gas-liquid mixed refrigerant, and enters the intermediate heat exchanger 2 12 to cool the battery circulation water circuit. Here, the liquid refrigerant absorbs heat and evaporates to become a low-temperature and low-pressure gaseous refrigerant. The water circuit circulation takes away the heat of the battery, thereby achieving the purpose of cooling the battery; the low-temperature and low-pressure gaseous refrigerant returns to the compressor to complete the battery refrigeration cycle.

[0050] Heat pump system heats the battery separately:

[0051] When the outside temperature is lower than 2°C, the temperature inside the car is higher than 15°C, and the water temperature inside the battery is lower than 0°C, the electric compressor is turned on, and the high-temperature and high-pressure gaseous refrigerant exchanges heat with water, and the heat circulates through the water circuit to heat the battery;

[0052] At this time, electromagnetic valve 2 62 is closed, electromagnetic valve 1 61, electromagnetic valve 3 63, electromagnetic valve 4 64, electromagnetic valve 5 65, electromagnetic valve 6 66, and electromagnetic valve 7 67 are opened; water pump 1 51 and water pump 2 52 are opened, water pump 3 53 is closed, and throttling device 3 39 is closed. Electromagnetic stop valve 1 6, electromagnetic stop valve 3 7, and electromagnetic stop valve 4 8 are closed, and electromagnetic stop valve 2 5 is opened; when the electric compressor 1 is started, the valve is first adjusted to the preset position; when shutting down, the electric compressor 1 controls the speed according to the heat load; 5, throttling device 1 31, and throttling device 2 38 are in full-open state.

[0053] The specific implementation is as follows: in winter, the low-temperature and low-pressure gaseous refrigerant is compressed by the electric compressor 1 into a high-temperature and high-pressure gaseous refrigerant, and enters the indoor heat exchanger 4 and the intermediate heat exchanger 20 through the electromagnetic stop valve 25, releases heat in the intermediate heat exchanger 20, circulates through the water circuit, passes through the electromagnetic valve group and the water pump group, enters each battery group to heat the battery. The refrigerant returns to the electric compressor 1 through the gas-liquid separator 2, completing the battery heating cycle.

[0054] The residual heat from the motor and electronically controlled radiator is used to heat the battery:

[0055] When the outside temperature is lower than 2℃, the temperature inside the car is higher than 15℃, the water temperature inside the battery is lower than 0℃, the water temperature inside the motor and electronic control system is higher than 20℃, and the water temperature inside the battery is lower than 0℃, the electric compressor rotates one by one, and the residual heat of the motor and electronic control radiator is turned on to heat the battery;

[0056] At this time, solenoid valve two 62 and solenoid valve seven 67 are closed; solenoid valve one 61, solenoid valve three 63, solenoid valve four 64, solenoid valve five 65, and solenoid valve six 66 are opened; water pump one 71, water pump two 72, and water pump three 73 are opened, and throttling device three 39 is closed; when the water temperature in the motor electronic control system is higher than 20°C and the water temperature in the battery is lower than 0°C, the system is turned on. When the water temperature in the motor electronic control system is lower than 20°C, or the water temperature in the battery is higher than 0°C, the system is turned off. The specific implementation method is: in winter, when there is residual heat in the motor and electronically controlled radiator during driving, this mode can be started. The heat in the motor and electronically controlled radiator passes through the circulating water system, passes through the solenoid valve group and the water pump group, and enters each battery group to heat the battery. Then the circulating water returns to the motor and the electronically controlled radiator to complete the battery heating cycle.

[0057] Outdoor heat exchanger defrosting working mode:

[0058] When the outside temperature is lower than 2°C and the outdoor heat exchanger temperature is lower than 0°C, the electric compressor starts and the outdoor heat exchanger defrosting mode is turned on;

[0059] At this time, the electromagnetic stop valve 2 5 and the electromagnetic stop valve 3 7 are opened, and the electromagnetic stop valve 1 6 and the electromagnetic stop valve 4 8 are closed; the electric compressor 1 controls the speed according to the temperature sensor 2 32 and the pressure sensor 2 36; and the throttling device 1 31 is in a fully open state.

[0060] The specific implementation method is as follows: in winter, the low-temperature and low-pressure gaseous refrigerant is compressed by the electric compressor 1 to become the high-temperature and high-pressure gaseous refrigerant, enters the indoor heat exchanger 4 through the electromagnetic stop valve 2 5, passes through the throttling device 1 31, and then enters the outdoor air-cooled heat exchanger. After releasing heat, the high-temperature and high-pressure gaseous refrigerant is cooled to become a low-temperature and low-pressure gas-liquid mixture, and then flows through the electromagnetic stop valve 3 7 and the gas-liquid separator to return to the electric compressor 1, completing the defrosting working cycle.

[0061] It should be noted that although the present invention shows a plurality of preferred embodiments and describes many details of the air conditioning heat pump system of the present invention through these embodiments, the applicant does not intend to limit the scope of the present invention to or in any form to these details. The specification of the present invention will be understood as being based on all novel and non-obvious schemes based on the idea of ​​the present invention including these combinations, substitutions or changes, so that these schemes can be presented in this application. Thus, the scope of the present invention is not determined by reference to the above description, but should be determined by all equivalent scopes of the present invention.

Claims

1. Electric vehicle heat pump air conditioning system, characterized by: The invention comprises a cooling and heating unit, an intermediate heat exchanger, a battery cooling and heat recovery unit, a motor radiator, and an electronically controlled radiator, wherein the cooling and heating unit comprises: an electric compressor (1), a gas-liquid separator (2), an outdoor heat exchanger (3), and an indoor heat exchanger (4); the electric compressor (1) is connected to the indoor heat exchanger (4) through an electromagnetic stop valve (5), and is connected to the outdoor heat exchanger (3) through an electromagnetic stop valve (6); the electric compressor (1) is connected to the gas-liquid separator (2) through a pipeline; the gas-liquid separator (2) is connected to the outdoor heat exchanger (3) through an electromagnetic stop valve (7), and is connected to the indoor heat exchanger (4) through an electromagnetic stop valve (8); the intermediate heat exchanger (20) is respectively connected to the gas-liquid separator (2) and the indoor heat exchanger (4) to form a refrigerant circuit; The battery is connected to the intermediate heat exchanger (20) through a pipeline to form a water circuit, and a water pump is installed in the circuit of each battery group; the battery cooling and heat recovery unit includes an electric compressor (10), a battery condenser (11), and an intermediate heat exchanger (12), wherein the electric compressor (10), the battery condenser (11), and the intermediate heat exchanger (12) are connected to each other through a pipeline to form a circuit, and the battery cooling and heat recovery unit is connected in parallel in the liquid circuit of the intermediate heat exchanger (20), and the circuits of the electric compressor (10) and the intermediate heat exchanger (12) are respectively equipped with a pressure sensor (40) and a throttling device (39); the circuits of the electric compressor (10) and the intermediate heat exchanger (12) are equipped with a pressure sensor (41); The water circuit of the intermediate heat exchanger (20) is also connected in parallel with a motor radiator circuit, an electric control radiator circuit, and a motor electric control circuit; and also includes a PTC heating unit, which is independently connected to the circuit of the air conditioning system.

2. The electric vehicle heat pump air conditioning system according to claim 1, characterized in that: A second temperature detector (32) is installed on the circuit between the outdoor heat exchanger (3) and the indoor heat exchanger (4), a third temperature detector (33) is installed on the circuit between the gas-liquid separator (2) and the indoor heat exchanger (4), a first temperature detector (31) is installed on the output main circuit of the indoor heat exchanger (4), and a fourth temperature detector (34) is installed on the circuit between the gas-liquid separator (2) and the intermediate heat exchanger (20); the temperature detectors respectively detect the temperature of the refrigerant in the circuit; A pressure sensor (35) is installed on the output main circuit of the electric compressor (1) for detecting the pressure of the gaseous refrigerant; a pressure sensor (36) is installed on the input main circuit of the gas-liquid separator for detecting the pressure of the liquid refrigerant; a throttling device (37) is installed on the output main circuit of the indoor heat exchanger, and a throttling device (38) is installed on the circuits of the indoor heat exchanger (4) and the intermediate heat exchanger (20); the throttling devices are respectively used to reduce the pressure of the refrigerant in the circuit.

3. The electric vehicle heat pump air conditioning system according to claim 2, characterized in that: The battery circuit is provided with a water pump 1 (51) and a water pump 2 (52); the motor electronic control (72) input main circuit is provided with a water pump 3 (53); the water pumps are used for water circuit circulation; the motor radiator 1 (70) and the intermediate heat exchanger 2 (12) circuit are provided with a solenoid valve 1 (61); the battery and the intermediate heat exchanger 2 (12) circuit are provided with a solenoid valve 2 (62); the motor radiator and the battery circuit are provided with a solenoid valve 3 (63); the motor radiator and the electronic control radiator circuit are provided with a solenoid valve 4 (64); the motor radiator input main circuit is provided with a solenoid valve 5 (65); the electronic control radiator and the motor electronic control circuit are provided with a solenoid valve 6 (66); the intermediate heat exchanger 1 (20) and the motor electronic control (72) circuit are provided with a solenoid valve 7 (67).

4. The electric vehicle heat pump air conditioning system according to any one of claims 1 to 3, characterized in that: The specific control logic is as follows: When the outside temperature is lower than 10°C and the water temperature in the motor-controlled radiator is higher than 20°C, the electric compressor 1 (1) starts to rotate and the waste heat recovery heating mode is turned on; when the outside temperature is lower than -10°C, all compressors are shut down, the PTC starts to work, and the PTC independent heating mode is turned on.

5. The electric vehicle heat pump air conditioning system according to claim 4, characterized in that: The specific control logic is as follows: When the outside temperature is lower than 2°C, the temperature inside the vehicle is higher than 15°C, the water temperature inside the battery is lower than 0°C, the water temperature inside the motor and electronic control system is higher than 20°C, and the water temperature inside the battery is lower than 0°C, the electric compressor (1) rotates, and the residual heat from the motor and electronic control radiator is turned on to heat the battery.

6. The electric vehicle heat pump air conditioning system according to claim 5, characterized in that: When the outside temperature is lower than 10°C and the water temperature in the motor-controlled radiator is higher than 15°C, the electric compressor (1) starts to rotate, and the waste heat recovery and intermediate heat exchanger (20) are turned on to operate in a heating mode; when the air temperature is lower than 10°C and the water temperature in the motor-controlled radiator is lower than 15°C, the electric compressor (1) starts to rotate, and the indoor heat exchanger (4) is turned on to operate in a heating mode.

7. The electric vehicle heat pump air conditioning system according to claim 5 or 6, characterized in that: When the outside temperature is higher than 28°C, the temperature inside the vehicle is lower than 20°C, and the water temperature inside the battery is higher than 30°C, the electric compressor 2 (10) is turned on to cool the battery alone; When the outside temperature is lower than 2°C, the temperature inside the vehicle is higher than 15°C, and the water temperature inside the battery is lower than 0°C, the electric compressor 1 (1) is turned on, and the high-temperature refrigerant discharged from the electric compressor 1 (1) is used to heat the battery alone; When the outside temperature is lower than 2°C and the temperature of the outdoor heat exchanger is lower than 0°C, the electric compressor (1) starts and the outdoor heat exchanger defrosting mode is turned on; When the outside temperature is lower than 10°C and the fog inside the car is heavy, the electric compressor (1) starts, the PTC works, and the cockpit heating and defogger working mode is turned on; when the outside temperature is higher than 28°C, the temperature inside the car is higher than 25°C, and the water temperature in the battery is lower than 30°C, the electric compressor (1) rotates, and the cockpit cooling working mode is turned on.

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