Passenger car air conditioner, defrosting control method, device and equipment thereof and medium

Abstract

The invention discloses a passenger car air conditioner and a defrosting control method, device and equipment thereof and a medium, the passenger car air conditioner comprises a compressor, an external heat exchanger, an internal heat exchanger, a multi-way valve, a gas-liquid separator, a first throttling element and a battery heat exchange auxiliary road, and the battery heat exchange auxiliary road comprises a second throttling element and a battery heat exchanger. The compressor, the multi-way valve, the external heat exchanger, the first throttling element, the internal heat exchanger, the multi-way valve, the gas-liquid separator and the compressor are sequentially connected, the second throttling element is connected with the first throttling element and the external heat exchanger, and the second throttling element, the battery heat exchanger and the multi-way valve are sequentially connected. During defrosting, the compressor communicates with the external heat exchanger and the internal heat exchanger through the multi-way valve, and the battery heat exchanger communicates with the gas-liquid separator through the multi-way valve. According to the invention, the inner heat exchanger and the outer heat exchanger can heat simultaneously during frosting, so that the passenger cabin can be heated continuously while the defrosting effect is achieved, and the comfort of passengers in a vehicle in winter is kept.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of air conditioners, and in particular to a bus air conditioner and a defrosting control method, device, equipment and medium thereof. Background Art

[0002] With the global emphasis on environmental protection and sustainable development, new energy buses, as an important part of public transportation, are developing in the direction of high mileage and low power consumption. In order to achieve the goal of green and environmentally friendly development, ensuring the efficient operation of batteries has become one of the key factors, which not only helps to improve battery efficiency and life, but also effectively utilizes the heat generated by the heating components of the vehicle and promotes the recycling of energy. However, in the cold winter environment, new energy buses face a special challenge: since most buses use an air cooling system to manage battery temperature instead of a more complex and costly water cooling system, this design easily causes frost on the external heat exchanger under low temperature conditions. Frosting can bring a series of negative effects, such as reducing the heat exchange efficiency of the system, increasing energy consumption, possibly causing equipment damage, hindering air circulation, poor refrigerant reflux, and significantly increasing maintenance costs. In addition, when the existing defrosting method, that is, turning on the cooling mode to melt the frost layer, it will have a great impact on the comfort of passengers in the cabin, because the air conditioning system that should provide warmth starts to cool at this time, seriously affecting the comfort of passengers. Summary of the invention

[0003] The present invention provides a bus air conditioner and a defrosting control method, device, equipment and medium thereof, aiming to solve the problem that the comfort of passengers in the cabin is affected when the existing bus air conditioner turns on the refrigeration mode for defrosting.

[0004] In a first aspect, an embodiment of the present invention provides a passenger car air conditioner, comprising: a compressor, an external heat exchanger, an internal heat exchanger, a multi-way valve, a gas-liquid separator, a first throttling element and a battery heat exchange auxiliary circuit, wherein the battery heat exchange auxiliary circuit comprises a second throttling element and a battery heat exchanger, wherein the compressor, the multi-way valve, the external heat exchanger, the first throttling element, the internal heat exchanger, the multi-way valve, the gas-liquid separator and the compressor are connected in sequence, wherein the second throttling element is connected to the first throttling element and the external heat exchanger respectively, and wherein the second throttling element, the battery heat exchanger and the multi-way valve are connected in sequence;

[0005] During defrosting, the multi-way valve connects the compressor to the external heat exchanger and the internal heat exchanger, respectively, and connects the battery heat exchanger to the gas-liquid separator.

[0006] Furthermore, the multi-way valve includes a rotatable valve core and five valve ports, the valve core is provided with a double-port channel and a three-port channel, the rotation of the valve core drives the double-port channel and the three-port channel to communicate with different valve ports among the five valve ports respectively, and the five valve ports are respectively connected to the compressor, the external heat exchanger, the internal heat exchanger, the battery heat exchanger, and the gas-liquid separator.

[0007] Furthermore, the dual-port channel connects the battery heat exchanger and the gas-liquid separator.

[0008] Furthermore, the three-port channel connects the compressor, the external heat exchanger and the internal heat exchanger.

[0009] In a second aspect, the present invention further provides a defrosting control method for a bus air conditioner, which is applied to the bus air conditioner of the first aspect, and the method comprises:

[0010] Obtain the refrigerant temperature of the external heat exchanger and the external ambient temperature;

[0011] Determining whether to enter the defrost mode according to the refrigerant temperature and the external environment temperature;

[0012] If the defrost mode is entered, the multi-way valve is controlled to switch the pipelines and defrost according to the preset defrost time.

[0013] In a third aspect, the present invention further provides a defrost control device for a passenger car air conditioner, comprising a unit for executing the method of the second aspect.

[0014] In a fourth aspect, an embodiment of the present invention further provides a computer device, comprising a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the method of the second aspect when executing the computer program.

[0015] In a fifth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer program, when executed by a processor, can implement the method of the second aspect described above.

[0016] The present invention provides a bus air conditioner and its defrosting control method, device, equipment and medium. The bus air conditioner includes: a compressor, an external heat exchanger, an internal heat exchanger, a multi-way valve, a gas-liquid separator, a first throttling element and a battery heat exchange auxiliary circuit, and the battery heat exchange auxiliary circuit includes a second throttling element and a battery heat exchanger, wherein the compressor, the multi-way valve, the external heat exchanger, the first throttling element, the internal heat exchanger, the multi-way valve, the gas-liquid separator, and the compressor are connected in sequence, the second throttling element is respectively connected to the first throttling element and the external heat exchanger, the second throttling element, the battery heat exchanger, and the multi-way valve are connected in sequence, during defrosting, the multi-way valve connects the compressor with the external heat exchanger and the internal heat exchanger respectively, the high-temperature and high-pressure refrigerant vapor discharged by the compressor enters the external heat exchanger through the multi-way valve and becomes a high-pressure liquid refrigerant, the refrigerant releases heat, and the frost becomes liquid when it encounters heat, thereby achieving the defrosting effect; the high-temperature and high-pressure refrigerant vapor discharged by the compressor also It enters the internal heat exchanger through the multi-way valve and becomes a high-pressure liquid refrigerant. The refrigerant releases heat and exchanges heat with the air to achieve a heating effect, thereby realizing heating in the cabin and improving the comfort of the passengers. In addition, the multi-way valve connects the battery heat exchanger with the gas-liquid separator, and the two paths coming out of the internal and external heat exchangers converge. The high-pressure liquid refrigerant passes through the second throttling element and becomes low-temperature and low-pressure wet steam, which enters the battery heat exchanger and exchanges heat with the water path. The refrigerant becomes a low-pressure gas to achieve a battery cooling effect, and then enters the gas-liquid separator from the multi-way valve. After the action of the gas-liquid separator, the gaseous refrigerant returns to the compressor to complete the cycle. In this way, the internal and external heat exchangers heat at the same time, achieving the defrosting effect while the cabin continues to heat, maintaining the comfort of the passengers in the car in winter, and cooling the battery by the battery heat exchanger to improve energy utilization and increase battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the refrigerant flow direction during defrosting of a passenger car air conditioner according to an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a multi-way valve of a passenger car air conditioner according to an embodiment of the present invention;

[0020] Figure 3 A schematic flow chart of the steps of a defrosting control method for a passenger car air conditioner according to an embodiment of the present invention;

[0021] Figure 4 It is a schematic flow chart of the sub-steps of the defrosting control method for a passenger car air conditioner according to an embodiment of the present invention;

[0022] Figure 5 A schematic flow chart of the steps of a defrosting control method for a passenger car air conditioner according to another embodiment of the present invention;

[0023] Figure 6 A schematic block diagram of a defrost control device for a passenger car air conditioner provided by an embodiment of the present invention;

[0024] Figure 7 A schematic block diagram of a computer device provided in an embodiment of the present invention;

[0025] Reference numerals:

[0026] 3. Compressor; 4. Internal heat exchanger; 5. Internal fan; 6. First throttling element; 7. Filter; 8. External heat exchanger; 9. External fan; 10. Multi-way valve; 11. Valve port; 12. Valve core; 13. Double-port channel; 14. Three-port channel; 11. Gas-liquid separator; 12. Second throttling element; 13. Battery heat exchanger. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0029] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0030] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0031] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0032] In order to facilitate understanding of the present invention, the passenger car air conditioner provided by the embodiment of the present invention is first described. Figure 1 and Figure 2 An embodiment of the present invention provides a passenger car air conditioner, comprising: a compressor 3, an external heat exchanger 8, an internal heat exchanger 4, a multi-way valve 10, a gas-liquid separator 11, a first throttling element 6 and a battery heat exchange auxiliary circuit, wherein the battery heat exchange auxiliary circuit comprises a second throttling element 12 and a battery heat exchanger 13, the compressor 3, the multi-way valve 10, the external heat exchanger 8, the first throttling element 6, the internal heat exchanger 4, the multi-way valve 10, the gas-liquid separator 11, and the compressor 3 are connected in sequence, the second throttling element 12 is connected to the first throttling element 6 and the external heat exchanger 8 respectively, the second throttling element 12, the battery heat exchanger 13, and the multi-way valve 10 are connected in sequence; wherein, during defrosting, the multi-way valve 10 connects the compressor 3 to the external heat exchanger 8 and the internal heat exchanger 4 respectively, and connects the battery heat exchanger 13 to the gas-liquid separator 11.

[0033] In this embodiment, the traditional bus air conditioner needs to turn on the cooling mode for defrosting when frosting in winter, which not only affects the comfort of passengers in the cabin, but also may cause energy waste. To this end, this embodiment provides a bus air conditioner that can continue to heat the cabin during defrosting, greatly improving the comfort of passengers. Specifically, the bus air conditioner includes a compressor 3, an external heat exchanger 8, an internal heat exchanger 4, a multi-way valve 10, a gas-liquid separator 11, a first throttling element 6 and a battery heat exchange auxiliary circuit. The battery heat exchange auxiliary circuit is composed of a second throttling element 12 and a battery heat exchanger 13. The first throttling element 6 and the second throttling element 12 can be electronic expansion valves. The external heat exchanger 8 and the internal heat exchanger 4 are respectively equipped with an external fan 9 and an internal fan 5. A filter 7 is also provided between the external heat exchanger 8 and the second throttling element 12. Each component is connected in sequence to form a complete refrigeration / heating cycle system, and during defrosting, the multi-way valve 10 can change the fluid path of the system so that the compressor 3 can be connected to the external heat exchanger 8 and the internal heat exchanger 4 respectively, and the battery heat exchanger 13 can be connected to the gas-liquid separator 11. The air-conditioning system can maintain the heating function of the cabin during the defrosting process through the ingenious design of the multi-way valve 10. Specifically, in the defrosting mode, the multi-way valve 10 switches to the target position so that after the high-temperature and high-pressure gaseous refrigerant flows out of the compressor 3, a part of it passes through the external heat exchanger 8, in which the refrigerant releases heat and changes from a high-temperature and high-pressure gas to a high-pressure liquid refrigerant. At the same time, the frost on the surface of the external heat exchanger 8 encounters heat and quickly melts into liquid, achieving the defrosting effect; the other part enters the internal heat exchanger 4, in which the refrigerant releases heat again, exchanges heat with the air in the cabin, provides heat for the cabin, and ensures that the comfort of the passengers is not affected. The high-pressure liquid refrigerant coming out of the internal heat exchanger 4 merges with the high-pressure liquid refrigerant coming out of the external heat exchanger 8, and then passes through the second throttling element 12 of the battery heat exchange auxiliary circuit to become low-temperature and low-pressure wet vapor. These wet vapors enter the battery heat exchanger 13 (using a plate heat exchanger), exchange heat with the water circuit, absorb the heat generated by the battery, and the refrigerant becomes a low-pressure gas, thereby achieving the purpose of cooling the battery. After the cooled low-pressure gaseous refrigerant comes out of the battery heat exchanger 13, it passes through the multi-way valve 10 again and enters the gas-liquid separator 11. The gas-liquid separator 11 separates the gaseous refrigerant from any liquid components that may exist, ensuring that only gas enters the compressor 3, preventing the occurrence of liquid hammer, and protecting the safe operation of the compressor 3.

[0034] Through this embodiment, efficient defrosting can be achieved without sacrificing passenger comfort, while using excess heat to maintain the operating temperature of the battery, thereby improving the energy efficiency and reliability of the entire system. In addition, it can also reduce the increase in energy consumption caused by frequent activation of the cooling mode and the risk of equipment damage caused by frost.

[0035] Reference Figure 2 In one embodiment, the multi-way valve 10 includes a rotatable valve core and five valve ports. The valve core is provided with a double-port channel and a three-port channel. The rotation of the valve core drives the double-port channel and the three-port channel to communicate with different valve ports of the five valve ports, respectively. The five valve ports are respectively connected to the compressor 3, the external heat exchanger 8, the internal heat exchanger 4, the battery heat exchanger 13, and the gas-liquid separator 11. Specifically, the multi-way valve 10 can be a five-way valve, which includes a rotatable valve core and five valve ports. The valve core is provided with two channels, namely a double-port channel and a three-port channel. The double-port channel refers to a channel with two flow ports, one in and one out; the three-port channel refers to a channel with three flow ports, and the three flow ports are gathered together inside the valve core. The five valve ports are C, D, S, E1, and E2. There is a motor slot in the middle of the valve core. The rotation of the motor drives the valve core to rotate. The double-port channel and the three-port channel in the valve core can be rotated to different angles as needed to make each channel communicate with the corresponding valve port. The connection between these channels and the five valve ports can be changed by rotating the valve core. The five valve ports are respectively connected to the compressor 3, the external heat exchanger 8, the internal heat exchanger 4, the battery heat exchanger 13, and the gas-liquid separator 11, thereby realizing flexible control of the fluid path.

[0036] In one embodiment, the dual-port channel connects the battery heat exchanger 13 and the gas-liquid separator 11. Specifically, during the defrosting process, if the battery heat exchanger 13 and the gas-liquid separator 11 cannot be effectively connected, too much liquid refrigerant may enter the compressor 3, causing liquid hammer. In addition, the failure to fully utilize the heat absorbed by the battery heat exchanger 13 also means a waste of energy. The design of the dual-port channel ensures that in the defrosting mode, the refrigerant coming out of the battery heat exchanger 13 can directly enter the gas-liquid separator 11, which not only prevents the liquid refrigerant from entering the compressor 3, but also ensures that the heat absorbed by the battery heat exchanger 13 is fully utilized. The gas-liquid separator 11 will separate the gaseous refrigerant and return it safely to the compressor 3, while the liquid refrigerant is stored in the separator, waiting to participate in the cycle again. Specifically, the dual-port channel is switched to connect S and E1 respectively, where S is connected to the gas-liquid separator 11, D is connected to the compressor 3, and E1 is connected to the battery heat exchanger 13. The two roads (main road and auxiliary road) converge, and the second throttling element 12 of the auxiliary road becomes low-temperature and low-pressure wet steam, enters the battery heat exchanger 13 (plate heat exchanger), exchanges heat with the water road, and the refrigerant becomes a low-pressure gas to achieve battery cooling, and then enters the gas-liquid separator 11 from the E1 port to the S port of the multi-way valve 10. After the action of the gas-liquid separator 11, the gaseous refrigerant enters the compressor 3. Through this embodiment, the safety of the system is improved, the occurrence of liquid hammer is prevented, and the energy utilization efficiency is also improved. By directly connecting the battery heat exchanger 13 with the gas-liquid separator 11, the heat generated by the battery can be better managed and utilized, which helps to maintain the optimal operating temperature of the battery and extend its service life.

[0037] In one embodiment, the three-port channel connects the compressor 3, the external heat exchanger 8 and the internal heat exchanger 4. Specifically, the three-port channel is used to connect the compressor 3, the external heat exchanger 8 and the internal heat exchanger 4. In different operating modes, the three-port channel can change the connection mode between the three components by rotating the valve core to adapt to the needs of cooling, heating or defrosting. The design of the three-port channel allows a closed circulation path to be formed between the compressor 3, the external heat exchanger 8 and the internal heat exchanger 4 in normal cooling or heating mode. In the defrosting mode, by rotating the valve core, the three-port channel can be reconfigured so that the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 3 can be defrosted through the external heat exchanger 8 and can enter the internal heat exchanger 4 to provide heat for the cabin, so that the purpose of defrosting is achieved without affecting the heating performance of the cabin. Specifically, the three-port channel is switched to connect C, D, and E2 respectively, where C is connected to the external heat exchanger 8, D is connected to the compressor 3, and E2 is connected to the internal heat exchanger 4. The high-temperature and high-pressure refrigerant vapor discharged from the compressor 3 passes through the multi-way valve 10, and one end of the D port is connected to the C port to enter the external heat exchanger 8 and become a high-pressure liquid refrigerant. The refrigerant releases heat, and the frost turns into liquid when it encounters heat, achieving the defrosting effect. The other end of the D port is connected to the E2 port to enter the internal heat exchanger 4 and become a high-pressure liquid refrigerant. The refrigerant releases heat and exchanges heat with the air to achieve the heating effect. Through this embodiment, the flexibility and adaptability of the system are greatly improved, and the fluid path can be automatically adjusted under different working conditions to ensure the efficient operation of the system.

[0038] To summarize, through this embodiment, the multi-way valve 10 is used in the defrost mode to allow the external heat exchanger 8 and the internal heat exchanger 4 to generate heat at the same time, thereby achieving the defrost effect and cooling the battery at the same time. Compared with the traditional defrost mode that uses the internal heat exchanger 4 for cooling and the external heat exchanger 8 for heating, the advantage is that it improves the comfort of passengers when the heating and defrost mode is turned on in winter, and the battery is cooled through the vehicle thermal management system, which also improves energy utilization and increases battery life.

[0039] See also Figure 3 , Figure 3 The flowchart of the defrost control method of the passenger car air conditioner provided by the embodiment of the present invention. The passenger car air conditioner applied to the above embodiment has been described in detail in the above embodiment. For the sake of brevity of the specification, it will not be repeated here. The defrost control method of the passenger car air conditioner is described in detail below. Figure 3 As shown, the method includes the following steps: S110-S130.

[0040] S110, obtaining the refrigerant temperature of the external heat exchanger and the external environment temperature;

[0041] S120, determining whether to enter the defrost mode according to the refrigerant temperature and the external environment temperature;

[0042] S130: If the defrost mode is entered, the multi-way valve is controlled to switch the pipelines and defrost according to the preset defrost time.

[0043] In this embodiment, when the conventional passenger car air conditioner is frosted in winter, a fixed defrosting cycle or a simple temperature threshold is usually used to determine whether to start the defrosting program. This method may lead to untimely defrosting or excessive defrosting, affecting the efficiency of the system and the comfort of passengers. In addition, the lack of comprehensive consideration of the external ambient temperature and the refrigerant temperature is prone to misjudgment, thereby affecting the stability and energy efficiency of the system. Therefore, this embodiment provides a more intelligent defrosting control method, which can dynamically adjust the defrosting strategy according to actual conditions and improve the adaptability and reliability of the system. Specifically, the refrigerant temperature and the external ambient temperature of the external heat exchanger are monitored in real time. These two parameters are the key basis for judging whether it is necessary to enter the defrosting mode. In order to ensure the accuracy of the data, high-precision temperature sensors can be installed at the outlet of the external heat exchanger and the outside of the vehicle, and the data of these sensors can be read regularly through the control system. According to the collected refrigerant temperature and external ambient temperature, the system judges whether it is necessary to enter the defrosting mode through the built-in judgment conditions. The specific judgment logic can be set according to actual needs. For example, when the external ambient temperature is lower than a certain threshold (such as 0°C) and the refrigerant temperature of the external heat exchanger continues to be lower than a certain low temperature threshold (such as -5°C) for a period of time (such as 30 minutes), it is considered that there is a risk of frost and the system enters the defrost mode. Alternatively, when the temperature difference between the refrigerant temperature of the external heat exchanger and the external ambient temperature exceeds a certain range (such as 10°C), it is also considered that the risk of frost has increased, triggering the defrost mode. Of course, it is understandable that there can be other judgment methods, which are not limited here. Once it is determined to enter the defrost mode, the control system will immediately send an instruction to the multi-way valve to switch it to the defrost position and change the fluid path. After the multi-way valve is switched, the high-temperature and high-pressure refrigerant vapor discharged from the compressor is defrosted through the external heat exchanger and enters the internal heat exchanger to provide heat for the cabin. The high-pressure liquid refrigerant coming out of the internal and external heat exchangers converges and enters the battery heat exchange auxiliary circuit, and is converted into low-temperature and low-pressure wet vapor through the second throttling element, and enters the battery heat exchanger (plate heat exchanger) to cool the battery, and finally returns to the compressor to complete the entire defrosting cycle. During the defrosting process, the system operates according to the preset defrosting time to ensure that the frost layer is completely melted without excessive defrosting. The preset defrosting time can be optimized based on historical data and experimental results to achieve the best effect.

[0044] Through this embodiment, a multi-way valve is used to allow the external heat exchanger and the internal heat exchanger to generate heat at the same time, and to cool the battery. When the passenger compartment needs to be heated in winter, it will not be like the previous defrosting solution, where the passenger compartment needs to be refrigerated for defrosting. The solution of this embodiment can improve the comfort of passengers and the cooling of batteries, improve energy utilization and increase battery life.

[0045] In one embodiment, if Figure 4 As shown, the step S120 includes: S121-S123.

[0046] S121, if the external environment temperature is greater than or equal to the first preset temperature, and the refrigerant temperature is less than the third preset temperature, determining to enter the defrost mode;

[0047] S122: If the external environment temperature is lower than the first preset temperature and greater than or equal to the second preset temperature, and the refrigerant temperature is lower than the fourth preset temperature, it is determined to enter the defrost mode;

[0048] S123: If the external environment temperature is lower than the second preset temperature and the refrigerant temperature is lower than the fifth preset temperature, it is determined to enter the defrost mode.

[0049] In this embodiment, the traditional defrosting control method usually relies on a fixed temperature threshold or time period. This method may not be flexible enough under complex climatic conditions, and may easily lead to untimely defrosting or excessive defrosting, affecting the efficiency of the system and the comfort of passengers. This embodiment introduces multiple temperature thresholds and makes defrosting judgments based on different combinations of external ambient temperature and refrigerant temperature, thereby improving the accuracy and adaptability of defrosting decisions and ensuring that the system can operate efficiently in various environments. Specifically, whether to start the defrosting program is determined based on different combinations of temperature thresholds, and these thresholds include a first preset temperature of T a , the second preset temperature T b , the third preset temperature T c , the fourth preset temperature T d , the fifth preset temperature T e , respectively used for defrosting judgment under different environmental conditions. The refrigerant temperature is hereinafter referred to as T1, and the external environment temperature is hereinafter referred to as T2. b <T a ; T e <T d <T c negative number).

[0050] When the external ambient temperature (T2) is greater than or equal to the first preset temperature (Ta), and the refrigerant temperature (T1) is less than the third preset temperature (Tc), it is determined to enter the defrost mode: for example, when T2 ≥ 0°C and T1 < -5°C, the temperature reaches zero degrees, the system considers that there is a risk of frost, and triggers the defrost mode. The defrost time can be 30 minutes.

[0051] When the external ambient temperature (T2) is lower than the first preset temperature (Ta) and greater than or equal to the second preset temperature (Tb), and the refrigerant temperature (T1) is lower than the fourth preset temperature (Td), it is determined to enter the defrost mode: for example, when T2 is between -5°C and 0°C, and T1 is less than -10°C, the temperature reaches below zero, the system also considers that there is a risk of frost, triggering the defrost mode, and the defrost time can be 35 minutes.

[0052] When the external ambient temperature (T2) is lower than the second preset temperature (Tb) and the refrigerant temperature (T1) is lower than the fifth preset temperature (Te), it is determined to enter the defrost mode: for example, when the external ambient temperature is lower than -5°C and the refrigerant temperature of the external heat exchanger is less than -15°C, the temperature is very low and the system considers that the risk of frost is higher. The defrost mode is started immediately and the defrost time can be 40 minutes.

[0053] By introducing multiple temperature threshold combinations, the system can more accurately determine whether it needs to enter the defrost mode, avoiding misjudgment or delayed defrosting due to a single threshold. Different temperature threshold combinations are suitable for different external ambient temperature ranges, ensuring that the system can effectively deal with frosting problems under various climatic conditions. Therefore, accurate defrost judgment reduces unnecessary defrost operations, reduces energy consumption, and extends the service life of the equipment.

[0054] In one embodiment, if Figure 5 As shown, the method further includes steps: S140-S150.

[0055] S140, if the external environment temperature is greater than the sixth preset temperature, the refrigerant temperature is greater than the seventh preset temperature, and the duration of maintaining the current refrigerant temperature reaches the first preset time, then exit the defrost mode; and / or,

[0056] S150: If the external environment temperature is less than or equal to the sixth preset temperature, the refrigerant temperature is greater than the eighth preset temperature, and the duration of maintaining the current refrigerant temperature reaches the second preset time, then exit the defrost mode.

[0057] In this embodiment, the traditional defrosting control method usually relies on a fixed time period to determine when to exit the defrosting mode, which may result in incomplete defrosting or excessive defrosting, affecting the efficiency of the system and the comfort of passengers. This embodiment introduces multiple temperature thresholds and duration conditions to ensure that the defrosting mode is exited after the frost layer is completely melted, thereby improving the reliability and efficiency of the defrosting process. The defrosting program is terminated based on different combinations of temperature thresholds and durations. These thresholds include a sixth preset temperature of T f , the seventh preset temperature T g , the eighth preset temperature T h , T h <Tg (positive number), as well as the first preset time and the second preset time, are used to ensure that the defrost mode is exited only after the frost layer is completely melted.

[0058] When the external ambient temperature (T2) is greater than the sixth preset temperature (Tf), and the refrigerant temperature (T1) is greater than the seventh preset temperature (Tg), and the duration of maintaining the current refrigerant temperature reaches the first preset time, the defrost mode is exited: for example, when the external ambient temperature is greater than 0°C, and the refrigerant temperature of the external heat exchanger is greater than -2°C, and this state lasts for 8 minutes, the system considers that the frost layer has completely melted and exits the defrost mode.

[0059] When the external ambient temperature (T2) is less than or equal to the sixth preset temperature (Tf), and the refrigerant temperature (T1) is greater than the eighth preset temperature (Th), and the duration of maintaining the current refrigerant temperature reaches the second preset time, the defrost mode is exited: for example, when the external ambient temperature is ≤0℃, and the refrigerant temperature of the external heat exchanger is >-5℃, and this state lasts for 12 minutes, the system also considers that the frost layer has been completely melted and exits the defrost mode.

[0060] Through this embodiment, by introducing the dual conditions of refrigerant temperature and duration, the system can ensure that the frost layer is completely melted before exiting the defrost mode, avoiding the problem of incomplete defrosting; by setting a reasonable duration, the system can avoid excessive defrosting and reduce energy waste while ensuring the defrost effect; precise exit conditions reduce the frequent switching of defrost modes and improve the stability and reliability of the system.

[0061] In summary, the embodiment of the present invention adds a multi-way valve on the refrigerant side of the original pure electric bus air-conditioning system. When the condenser is frosted, the evaporator and the condenser are heated at the same time to achieve the defrosting effect and cool the battery at the same time. The cabin continues to be heated to maintain the comfort of the passengers in the car in winter, and the battery is cooled by the plate heat exchanger to improve the utilization rate of energy and increase the life of the battery.

[0062] Figure 6 FIG. 2 is a schematic block diagram of a defrost control device 200 for a passenger car air conditioner provided by an embodiment of the present invention. Figure 6 As shown, corresponding to the above passenger car air conditioner defrost control method, the present invention also provides a passenger car air conditioner defrost control device 200. The passenger car air conditioner defrost control device 200 includes a unit for executing the above passenger car air conditioner defrost control method, and the device can be configured in a computer device. Figure 6 The defrost control device 200 for the passenger car air conditioner includes: an acquisition unit 201, a judgment unit 202 and a defrost unit 203.

[0063] Among them, the acquisition unit 201 is used to obtain the refrigerant temperature and the external ambient temperature of the external heat exchanger; the judgment unit 202 is used to judge whether to enter the defrost mode according to the refrigerant temperature and the external ambient temperature; the defrost unit 203 is used to control the multi-way valve to switch the pipeline and defrost according to the preset defrost time if entering the defrost mode.

[0064] In one embodiment, the determination unit 202 includes: a first determination unit, a second determination unit and a third determination unit.

[0065] Among them, the first judgment unit is used to determine that the defrost mode is entered if the external ambient temperature is greater than or equal to the first preset temperature, and the refrigerant temperature is less than the third preset temperature; the second judgment unit is used to determine that the defrost mode is entered if the external ambient temperature is less than the first preset temperature and greater than or equal to the second preset temperature, and the refrigerant temperature is less than the fourth preset temperature; the third judgment unit is used to determine that the defrost mode is entered if the external ambient temperature is less than the second preset temperature, and the refrigerant temperature is less than the fifth preset temperature.

[0066] In one embodiment, the defrost control device 200 for the passenger car air conditioner further includes: a first exit unit and a second exit unit.

[0067] Among them, the first exit unit is used to exit the defrost mode if the external ambient temperature is greater than the sixth preset temperature, the refrigerant temperature is greater than the seventh preset temperature, and the current refrigerant temperature is maintained for a first preset time; the second exit unit is used to exit the defrost mode if the external ambient temperature is less than or equal to the sixth preset temperature, the refrigerant temperature is greater than the eighth preset temperature, and the current refrigerant temperature is maintained for a second preset time.

[0068] The defrost control device 200 for the passenger car air conditioner can be implemented in the form of a computer program. The computer program can be implemented in the form of a computer program. Figure 7 Runs on the computer device shown.

[0069] See also Figure 7 , Figure 7 5 is a schematic block diagram of a computer device provided in an embodiment of the present application. The computer device 500 may be a terminal.

[0070] See also Figure 7 The computer device 500 includes a processor 502 , a memory and a network interface 505 connected via a system bus 501 , wherein the memory may include a non-volatile storage medium 503 and an internal memory 504 .

[0071] The non-volatile storage medium 503 can store an operating system 5031 and a computer program 5032. The computer program 5032 includes program instructions, and when the program instructions are executed, the processor 502 can execute a defrosting control method for a passenger car air conditioner.

[0072] The processor 502 is used to provide computing and control capabilities to support the operation of the entire computer device 500 .

[0073] The internal memory 504 provides an environment for the operation of the computer program 5032 in the non-volatile storage medium 503. When the computer program 5032 is executed by the processor 502, the processor 502 can execute a defrosting control method for a passenger car air conditioner.

[0074] The network interface 505 is used to communicate with other devices over the network. Figure 7 The structure shown in the figure is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device 500 to which the solution of the present application is applied. The specific computer device 500 may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0075] The processor 502 is used to run a computer program 5032 stored in the memory to implement the steps of the above method.

[0076] It should be understood that in the embodiment of the present application, the processor 502 may be a central processing unit (CPU), and the processor 502 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0077] It can be understood by those skilled in the art that all or part of the processes in the method for implementing the above embodiment can be completed by instructing the relevant hardware through a computer program. The computer program includes program instructions, and the computer program can be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the process steps of the embodiment of the above method.

[0078] Therefore, the present invention also provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program, wherein the computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the steps of the above method.

[0079] The storage medium may be a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk, etc., which are computer-readable storage media that can store program codes.

[0080] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0081] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of each unit is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0082] The steps in the method of the embodiment of the present invention can be adjusted in order, combined and deleted according to actual needs. The units in the device of the embodiment of the present invention can be combined, divided and deleted according to actual needs. In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0083] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device to execute all or part of the steps of the method described in each embodiment of the present invention.

[0084] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0085] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0086] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A passenger car air conditioner, characterized in that: include: A compressor, an external heat exchanger, an internal heat exchanger, a multi-way valve, a gas-liquid separator, a first throttling element and a battery heat exchange auxiliary circuit, wherein the battery heat exchange auxiliary circuit includes a second throttling element and a battery heat exchanger, wherein the compressor, the multi-way valve, the external heat exchanger, the first throttling element, the internal heat exchanger, the multi-way valve, the gas-liquid separator and the compressor are connected in sequence, wherein the second throttling element is respectively connected to the first throttling element and the external heat exchanger, and wherein the second throttling element, the battery heat exchanger and the multi-way valve are connected in sequence; During defrosting, the multi-way valve connects the compressor to the external heat exchanger and the internal heat exchanger, respectively, and connects the battery heat exchanger to the gas-liquid separator.

2. The passenger car air conditioner according to claim 1, characterized in that: The multi-way valve includes a rotatable valve core and five valve ports. The valve core is provided with a double-port channel and a triple-port channel. The rotation of the valve core drives the double-port channel and the three-port channel to communicate with different valve ports among the five valve ports respectively. The five valve ports are respectively connected to the compressor, the external heat exchanger, the internal heat exchanger, the battery heat exchanger, and the gas-liquid separator.

3. The passenger car air conditioner according to claim 2, characterized in that: The double-port channel connects the battery heat exchanger and the gas-liquid separator.

4. The passenger car air conditioner according to claim 2, characterized in that: The three-port channel connects the compressor, the external heat exchanger and the internal heat exchanger.

5. A defrosting control method for a passenger car air conditioner, characterized in that: Applied to the passenger car air conditioner according to any one of claims 1 to 4, the method comprises: Obtain the refrigerant temperature of the external heat exchanger and the external ambient temperature; Determining whether to enter the defrost mode according to the refrigerant temperature and the external environment temperature; If the defrost mode is entered, the multi-way valve is controlled to switch the pipelines and defrost according to the preset defrost time.

6. The method according to claim 5, characterized in that The step of judging whether to enter the defrost mode according to the refrigerant temperature and the external environment temperature comprises: If the external environment temperature is greater than or equal to the first preset temperature, and the refrigerant temperature is less than the third preset temperature, it is determined to enter the defrost mode; and / or, If the external environment temperature is lower than the first preset temperature and greater than or equal to the second preset temperature, and the refrigerant temperature is lower than the fourth preset temperature, it is determined to enter the defrost mode; and / or, If the external environment temperature is lower than the second preset temperature and the refrigerant temperature is lower than the fifth preset temperature, it is determined to enter the defrost mode.

7. The method according to claim 5, characterized in that The method comprises: If the external environment temperature is greater than the sixth preset temperature, the refrigerant temperature is greater than the seventh preset temperature, and the duration of maintaining the current refrigerant temperature reaches the first preset time, then exit the defrost mode; and / or, If the external environment temperature is less than or equal to the sixth preset temperature, the refrigerant temperature is greater than the eighth preset temperature, and the duration of maintaining the current refrigerant temperature reaches the second preset time, the defrost mode is exited.

8. A defrost control device for a passenger car air conditioner, characterized in that: The apparatus comprises means for executing the method of any one of claims 5 to 7 above.

9. A computer device, characterized in that: The computer device comprises a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the method according to any one of claims 5 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 5 to 7 can be implemented.

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