Vehicle-mounted cold energy air conditioning system and control method

Abstract

The application discloses a kind of vehicle-mounted cold energy air conditioning systems, including LNG storage tank, vaporizer, gas supply pipeline, cold carrier loop, refrigerant circuit, control unit and multiple sensors, vaporizer includes LNG flow channel and cold carrier flow channel;LNG storage tank outlet is connected by gas supply pipeline vaporizer LNG flow channel entrance, and vaporizer LNG flow channel export connects engine gas supply system;Cold carrier loop is connected in sequence along the direction of flow of cold carrier vaporizer cold carrier flow channel export, air conditioning cold core, water pump and evaporator return to vaporizer cold carrier flow channel entrance;Refrigerant circuit is connected in sequence along the direction of flow of refrigerant evaporator, compressor, condenser and throttling component return to evaporator;Based on the system, vehicle-mounted cold energy air conditioning control method is further proposed.The application can efficiently utilize LNG cold energy, while solving the problem of single cold source cold energy deficiency, can meet the demand of continuous refrigeration when vehicle is in parked state, and widens vehicle-mounted cold energy air conditioning application scenario.

Description

Technical Field

[0001] This invention relates to the field of automotive air conditioning technology, and in particular to an in-vehicle cooling air conditioning system and control method. Background Technology

[0002] The global scarcity of oil resources and increasing environmental pollution have spurred the widespread adoption of clean and efficient energy sources such as natural gas. With the increasing use of liquefied natural gas (LNG) as a clean energy source in the transportation sector, the cooling energy resources of LNG heavy-duty trucks have received greater attention. However, a significant amount of cooling energy released during LNG vaporization is typically carried away by cooling water in the carburetor, leading to underutilization of energy resources. Recovering this cooling energy can effectively improve energy efficiency and reduce the energy consumption of onboard air conditioning systems, achieving the dual goals of energy conservation and environmental protection. This technology can improve the performance and economy of heavy-duty commercial vehicles.

[0003] Although liquefied natural gas (LNG) cold energy recovery air conditioning systems exist, they typically rely on a single cold energy source, failing to meet the vehicle's need for rapid cooling in high-temperature environments or maintain a comfortable cabin temperature during prolonged periods of low fuel consumption. This has resulted in their near-absence in the vehicle market. Furthermore, existing parking air conditioning systems are usually independent of the original vehicle air conditioning system, requiring an additional refrigeration system. This limits their ability to work collaboratively with the original system and prevents them from compensating for each other's shortcomings.

[0004] Therefore, there is an urgent need for an innovative in-vehicle air conditioning system that can efficiently utilize LNG cooling energy, solve the problem of insufficient cooling energy from a single source, and meet the need for continuous cooling when the vehicle is parked. This technology will provide vehicles with a higher performance, greater economy, and more environmentally friendly solution. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an in-vehicle air conditioning system and control method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An on-board air conditioning system includes an LNG storage tank, a vaporizer, an LNG supply pipeline, a refrigerant circuit, a refrigerant circuit, a control unit, and multiple sensors;

[0008] The vaporizer includes an LNG channel and a refrigerant channel. The LNG channel is connected in series to the gas supply pipeline, and the refrigerant channel is connected in series to the refrigerant circuit.

[0009] The LNG outlet of the LNG storage tank is connected with the LNG flow channel inlet of the vaporizer through a gas supply pipeline, and the LNG flow channel outlet of the vaporizer is connected with the gas supply system of the engine;

[0010] The refrigerant circuit is sequentially connected with the refrigerant flow channel outlet of the vaporizer, passes through the air conditioning cold core, the water pump and the evaporator, and finally returns to the refrigerant flow channel inlet of the vaporizer along the refrigerant flow direction; the first temperature sensor is arranged at the inlet of the air conditioning cold core, and the first temperature sensor is used to collect the refrigerant temperature at the inlet of the air conditioning cold core;

[0011] The refrigerant circuit is sequentially connected with the evaporator, passes through the compressor, the condenser and the throttling component, and finally returns to the evaporator along the refrigerant flow direction; the condenser is provided with a condenser fan, and the condenser fan is used for heat dissipation of the condenser; the second temperature sensor and the first pressure sensor are arranged at the inlet of the compressor, and the second temperature sensor and the first pressure sensor are used to collect the suction temperature and pressure of the compressor;

[0012] The control unit collects parameters of multiple sensors, and the control unit is used to control the water pump, the compressor, the throttling component and the condenser fan.

[0013] As a further technical solution of the application, a cooling liquid pipeline is further included, the vaporizer is provided with a cooling liquid flow channel, one end of the cooling liquid pipeline is connected with the engine cooling water system, the other end of the cooling liquid pipeline is connected with the cooling liquid flow channel of the vaporizer, and an electromagnetic valve is arranged on the cooling water inflow pipeline in the cooling liquid flow channel, the electromagnetic valve is used to control the cooling liquid flow entering the vaporizer.

[0014] As a further technical solution of the application, an expansion water tank is further arranged at the inlet of the water pump in the refrigerant circuit, and the expansion water tank is used to buffer the thermal expansion and contraction of the refrigerant in the refrigerant circuit.

[0015] As a further technical solution of the application, the gas supply pipeline further includes a reheater, the cooling water flow channel of the reheater is connected with the cooling liquid pipeline in parallel with the vaporizer, the LNG flow channel of the reheater is connected with the gas supply system of the engine in series through the gas supply pipeline between the vaporizer and the engine gas supply system, and the reheater is used to reheat the NG outlet of the vaporizer to meet the requirements of the engine on the gas supply temperature.

[0016] As a further technical solution of the application, the compressor is a belt pulley driven compressor or an electric compressor, and the compressor is a variable displacement compressor.

[0017] As a further technical solution of the application, the throttling component is a thermal expansion valve or an electronic expansion valve.

[0018] As a further technical scheme of the present application, the flow area of the throttling component is adjusted according to the collected values of the first temperature sensor, the second temperature sensor and the first pressure sensor.

[0019] A vehicle-mounted cold energy air conditioner control method is realized based on the vehicle-mounted cold energy air conditioner system according to any one of claims 1-9, including a parking mode and a driving mode, and including the following specific steps:

[0020] S1: the vehicle is powered on, the vehicle-mounted cold energy air conditioner system is initialized, and the electromagnetic valve is in an open state;

[0021] S2: the vehicle-mounted cold energy air conditioner is started, the water pump starts to run at a set large flow value, the value T25 of the first temperature sensor, the value T35 of the second temperature sensor and the value P36 of the first pressure sensor are collected;

[0022] S3: the control unit first collects the starting state of the vehicle engine, if the engine is not started, the parking mode is entered, the electromagnetic valve is kept open, the value T25 of the first temperature sensor is judged, if T25≥the second temperature threshold, the compressor is started, and the refrigerant circuit starts to run;

[0023] S4: the refrigerant circuit runs for a period of time, the value T25 of the first temperature sensor continuously decreases, if T25

[0024] S5: the control unit collects the starting of the engine, enters the driving mode, judges the value T25 of the first temperature sensor, if T25>the first temperature threshold, the electromagnetic valve is closed, and the compressor is started, and the refrigerant circuit starts to run;

[0025] S6: the vehicle-mounted cold energy air conditioner runs for a period of time, the value T25 of the first temperature sensor continuously decreases, if the second temperature threshold≤T25≤the first temperature threshold, the electromagnetic valve is closed, and the compressor is closed, wherein the first temperature threshold is 5℃;

[0026] S7: the value T25 of the first temperature sensor continuously decreases, if T25

[0027] As a further technical scheme of the present application, the rotation speed or discharge volume of the compressor is matched according to the value T25 of the first temperature sensor, the value T35 of the second temperature sensor and the value P36 of the first pressure sensor.

[0028] As a further technical scheme of the present application, the throttling component is an electronic expansion valve, and the opening degree thereof is matched according to the value T35 of the second temperature sensor and the value P36 of the first pressure sensor.

[0029] The beneficial effects of the present application are:

[0030] 1. The present application adopts a dual cold source system combining LNG cold energy and vapor compression cycle, which can meet the needs of rapid cooling of vehicles in high temperature environment, and solve the problem of maintaining comfortable cabin temperature of vehicles under low fuel consumption for a long time.

[0031] 2. The present application effectively solves the problem that the refrigerant temperature in the system is prone to be too low to cause freezing when the vehicle air conditioning system is not running or the cold load is small.

[0032] 3. The vehicle-mounted cold energy air conditioning system and control method proposed by the present application have a parking mode and a driving mode, and the two modes can work intelligently and automatically maintain the continuous operation of the vehicle air conditioner, improving the overall user experience; this intelligent mode switching function effectively ensures the stable and comfortable environment in the vehicle, providing users with more convenient and efficient use experience. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic diagram of a vehicle-mounted cold energy air conditioning system proposed by the present application;

[0034] Figure 2 is Figure 1 a schematic diagram of a gas supply pipeline structure;

[0035] Figure 3 is Figure 1 a schematic diagram of a refrigerant circuit structure;

[0036] Figure 4 is Figure 1 a schematic diagram of a refrigerant circuit structure;

[0037] Figure 5 is Figure 1 a schematic diagram of a cooling liquid pipeline structure;

[0038] Figure 6 is a flow chart of a vehicle-mounted cold energy air conditioning control method proposed by the present application;

[0039] In the figure: 10. Gas supply pipeline, 11. LNG storage tank, 12. Vaporizer, 13. Reheater, 14. Engine, 20. Refrigerant circuit, 21. Air conditioning cold core, 22. Water pump, 23. Evaporator, 24. Expansion tank, 25. First temperature sensor, 30. Refrigerant circuit, 31. Throttling component, 32. Condenser, 33. Compressor, 34. Condensing fan, 35. Second temperature sensor, 36. First pressure sensor, 40. Cooling liquid pipeline, 41. Solenoid valve, 51. Control unit. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in conjunction with specific embodiments.

[0041] Embodiment 1

[0042] Please refer to the accompanying Figure 1 A vehicle-mounted cold energy air conditioning system, comprising an LNG storage tank 11, a vaporizer 12, a gas supply pipeline 10, a secondary refrigerant circuit 20, a refrigerant circuit 30, a control unit 51 and a plurality of sensors;

[0043] The vaporizer 12 comprises an LNG flow channel and a secondary refrigerant flow channel, the LNG flow channel is connected in series to the gas supply pipeline 10, and the secondary refrigerant flow channel is connected in series to the secondary refrigerant circuit 20;

[0044] As shown in Figure 2 , the liquid outlet of the LNG storage tank 11 is connected to the LNG flow channel inlet of the vaporizer 12 through the gas supply pipeline 10, the LNG flow channel outlet of the vaporizer 12 is connected to the NG inlet of the further provided afterheater 13, and the NG outlet of the afterheater 13 is connected to the gas supply system of the engine 14 through the gas supply pipeline;

[0045] As shown in Figure 3 , the secondary refrigerant circuit 20 is connected in sequence along the secondary refrigerant flow direction to the secondary refrigerant flow channel outlet of the vaporizer 12, passes through the air conditioning cold core 21, the water pump 22 and the evaporator 23, and finally returns to the secondary refrigerant flow channel inlet of the vaporizer 12; the water pump 22 inlet is provided with an expansion water tank 24, the air conditioning cold core 21 inlet is provided with a first temperature sensor 25, the first temperature sensor 25 is used to collect the secondary refrigerant temperature at the air conditioning cold core 21 inlet, and the air conditioning cold core 21 is usually installed in the air conditioning box;

[0046] As shown in Figure 4 , the refrigerant circuit 30 is connected in sequence along the refrigerant flow direction to the evaporator 23, passes through the compressor 33, the condenser 32 and the throttling component 31, and finally returns to the evaporator 23; the condenser 32 is provided with a condenser fan 34, which is used for heat dissipation of the condenser 32; the compressor 33 inlet is provided with a second temperature sensor 35 and a first pressure sensor 36, which are used to collect the suction temperature and pressure of the compressor 33;

[0047] As shown in Figure 5 , the vehicle-mounted cold energy air conditioning system is further provided with a cooling liquid pipeline 40, the vaporizer 12 is provided with a cooling liquid flow channel, one end of the cooling liquid pipeline 40 is connected to the cooling water system of the engine 14, the other end of the cooling liquid pipeline 40 is connected to the cooling liquid flow channel of the vaporizer 12, and the cooling water inflow pipeline in the cooling liquid flow channel is provided with an electromagnetic valve 41, which is used to control the cooling liquid flow into the vaporizer 12;

[0048] The control unit 51 collects parameters of the plurality of sensors, and the control unit 51 is configured to control the water pump 22, the compressor 33, the throttling component 31, the condenser fan 34 and the electromagnetic valve 41;

[0049] The compressor 33 is a belt-wheel driven variable displacement compressor or an electric variable displacement compressor; and the throttling component 31 is a thermal expansion valve or an electronic expansion valve.

[0050] The compressor 33 is provided with the second temperature sensor 35 and the first pressure sensor 36, and the control unit 51 acquires temperature and pressure information to control the operation of the compressor 33 and the throttling component 31 in the refrigerant circuit 30.

[0051] The vehicle-mounted cold energy air conditioner is powered by a vehicle constant power supply.

[0052] Embodiment 2

[0053] Please refer to the accompanying Figure 6 Based on the vehicle-mounted cold energy air conditioner system proposed in Embodiment 1 of the present application, the vehicle-mounted cold energy air conditioner control method proposed in Embodiment 2 of the present application includes a parking mode and a driving mode, and includes the following specific steps.

[0054] S1: The vehicle constant power supply is turned on, the vehicle-mounted cold energy air conditioner system is initialized, and the electromagnetic valve 41 is in an open state.

[0055] S2: The vehicle-mounted cold energy air conditioner is started, the water pump 22 starts to operate at a set large flow rate value, and the value T25 of the first temperature sensor, the value T35 of the second temperature sensor 35 and the value P36 of the first pressure sensor 36 are collected.

[0056] S3: The control unit 51 first collects the starting state of the vehicle engine 14, if the engine 14 is not started, the parking mode is entered, the electromagnetic valve 41 remains open, and the value T25 of the first temperature sensor is judged, if T25≥the second temperature threshold value, the compressor 33 is started, and the refrigerant circuit 30 starts to operate.

[0057] S4: The refrigerant circuit 30 operates for a period of time, the value T25 of the first temperature sensor 25 continuously decreases, if T25

[0058] S5: The control unit 51 collects the starting of the engine 14, enters the driving mode, judges the value T25 of the first temperature sensor 25, if T25>the first temperature threshold value, the electromagnetic valve 41 is closed, and the compressor 33 is started, and the refrigerant circuit 30 starts to operate.

[0059] S6: The vehicle-mounted cold energy air conditioner runs for a period of time, the value T25 of the first temperature sensor 25 continuously decreases, if the second temperature threshold value ≤ T25 ≤ the first temperature threshold value, the electromagnetic valve 41 is closed, and the compressor 33 is closed, wherein the first temperature threshold value is 5℃;

[0060] S7: The value T25 of the first temperature sensor 25 continuously decreases, if T25 < the second temperature threshold value, the electromagnetic valve 41 is opened.

[0061] In order to improve the stability of the vehicle-mounted cold energy air conditioning system, when the compressor 33 is started, the opening degree of the throttling component 31 and the exhaust capacity of the compressor 33 can be adaptively adjusted according to the changes of the second temperature sensor 35 and the first pressure sensor 36.

[0062] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: the present application can meet the needs of rapid cooling of vehicles in high-temperature environments, and solve the problem of maintaining the temperature of the cab at low fuel consumption for a long time, improve the driving comfort; and effectively solve the problem that the refrigerant temperature in the vehicle-mounted air conditioning system is easily too low to cause freezing when the system is not running or the cold load is small, ensuring the stable operation of the system; the system adopts intelligent parking and driving modes, so that it can work intelligently and cooperatively, ensure the continuous operation of the in-vehicle air conditioning system, and improve the user experience and comfort.

[0063] Those skilled in the art will understand that the discussion of any of the above embodiments is merely exemplary and is not intended to suggest that the scope of the present application (including the claims) is limited to these examples; under the concept of the present application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in detail for the sake of brevity.

[0064] The present application is intended to cover all such alternatives, modifications and variations as fall within the broad scope of the claims. Accordingly, any and all such modifications, variations or equivalents that fall within the spirit and scope of the application are intended to be included within the scope of the application.

Claims

1. A vehicle-mounted air conditioning control method, comprising an LNG storage tank (11), a vaporizer (12), an air supply pipeline (10), a refrigerant circuit (20), a refrigerant circuit (30), a control unit (51), and multiple sensors, characterized in that: The vaporizer (12) includes an LNG channel and a refrigerant channel. The LNG channel is connected in series to the gas supply pipeline (10), and the refrigerant channel is connected in series to the refrigerant circuit (20). The outlet of the LNG storage tank (11) is connected to the LNG inlet of the vaporizer (12) via the gas supply pipeline (10), and the LNG outlet of the vaporizer (12) is connected to the gas supply system of the engine (14). The refrigerant circuit (20) is connected in sequence to the refrigerant outlet of the vaporizer (12) along the refrigerant flow direction, passes through the air conditioning core (21), water pump (22) and evaporator (23), and finally returns to the refrigerant inlet of the vaporizer (12); a first temperature sensor (25) is installed at the inlet of the air conditioning core (21), and the first temperature sensor (25) is used to collect the refrigerant temperature at the inlet of the air conditioning core (21); The refrigerant circuit (30) is connected to the evaporator (23) in sequence along the refrigerant flow direction, passes through the compressor (33), condenser (32) and throttling device (31), and finally returns to the evaporator (23); the condenser (32) is equipped with a condenser fan (34), and the condenser fan (34) is used for heat dissipation of the condenser (32); the compressor (33) is equipped with a second temperature sensor (35) and a first pressure sensor (36) at the inlet, and the second temperature sensor (35) and the first pressure sensor (36) are used to collect the suction temperature and pressure of the compressor (33); The control unit (51) collects parameters from multiple sensors and is used to control the water pump (22), compressor (33), throttling device (31) and condenser fan (34); It also includes a coolant line (40), the carburetor (12) is equipped with a coolant flow channel, one end of the coolant line (40) is connected to the engine (14) cooling water system, the other end of the coolant line (40) is connected to the coolant flow channel of the carburetor (12), and a solenoid valve (41) is provided on the coolant flow pipe in the coolant flow channel. The solenoid valve (41) is used to control the flow rate of coolant entering the carburetor (12); It also includes parking mode and driving mode, the specific steps are as follows: S1: The vehicle is powered on and the vehicle air conditioning system is initialized, so that the solenoid valve (41) is in the open state. S2: The vehicle's air conditioning starts, and the water pump (22) starts to run at a set high flow rate, collecting the value T25 of the first temperature sensor (25), the value T35 of the second temperature sensor (35), and the value P36 of the first pressure sensor (36); S3: The control unit (51) first collects the starting status of the vehicle engine (14). If the engine (14) is not started, it enters the parking mode, the solenoid valve (41) remains open, and the value T25 of the first temperature sensor (25) is judged. If T25 ≥ the second temperature threshold, the compressor (33) is started and the refrigerant circuit (30) starts running. S4: After the refrigerant circuit (30) has been running for a period of time, the value T25 of the first temperature sensor (25) continues to decrease. If T25 < the second temperature threshold, the compressor (33) is turned off, where the second temperature threshold is -2℃. S5: When the control unit (51) detects that the engine (14) has started, it enters the driving mode and judges the value T25 of the first temperature sensor (25). If T25 > the first temperature threshold, it closes the solenoid valve (41) and starts the compressor (33), and the refrigerant circuit (30) starts running. S6: After the vehicle-mounted air conditioning has been running for a period of time, the value T25 of the first temperature sensor (25) continues to decrease. If the second temperature threshold ≤ T25 ≤ the first temperature threshold, the solenoid valve (41) is closed and the compressor (33) is turned off. The first temperature threshold is 5℃. S7: The value T25 of the first temperature sensor (25) continues to decrease. If T25 < the second temperature threshold, the solenoid valve (41) is opened.

2. The vehicle-mounted air conditioning control method according to claim 1, characterized in that, An expansion tank (24) is also provided at the inlet of the water pump (22) in the refrigerant circuit (20). The expansion tank (24) is used to buffer the thermal expansion and contraction of the refrigerant in the refrigerant circuit (20).

3. The vehicle-mounted air conditioning control method according to claim 1, characterized in that, The gas supply line (10) also includes a reheater (13). The cooling water channel of the reheater (13) is connected in parallel with the vaporizer (12) to the coolant line (40). The LNG channel of the reheater (13) is connected in series between the vaporizer (12) and the engine (14) gas supply system through the gas supply line (10). The reheater (13) is used to reheat the NG outlet of the vaporizer (12) to meet the gas supply temperature requirements of the engine (14).

4. The vehicle-mounted air conditioning control method according to claim 1, characterized in that, The compressor (33) is a belt-driven compressor or an electric compressor, and the compressor (33) is a variable displacement compressor.

5. The vehicle-mounted air conditioning control method according to claim 1, characterized in that, The throttling component (31) is a thermal expansion valve or an electronic expansion valve.

6. The vehicle-mounted air conditioning control method according to claim 5, characterized in that, The flow area of ​​the throttling component (31) is adjusted according to the values ​​collected by the first temperature sensor (25), the second temperature sensor (35), and the first pressure sensor (36).

7. The vehicle-mounted air conditioning control method according to claim 6, characterized in that, The speed or displacement of the compressor (33) is matched and output according to the value T25 of the first temperature sensor (25), the value T35 of the second temperature sensor (35) and the value P36 of the first pressure sensor (36).

8. The vehicle-mounted air conditioning control method according to claim 7, characterized in that, The throttling component (31) is an electronic expansion valve, and its opening degree is matched and output according to the value T35 of the second temperature sensor (35) and the value P36 of the first pressure sensor (36).

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