Air conditioning system and control method thereof

Abstract

The embodiment of the invention provides an air conditioning system and a control method thereof, relates to the technical field of air conditioners, and aims to improve the sterilization effect of the air conditioning system. The air conditioning system includes: an outdoor heat exchanger; an indoor heat exchanger; one end of the air pipe communicates with the indoor heat exchanger, and the other end communicates with the outdoor heat exchanger, so that the indoor heat exchanger is connected with the outdoor heat exchanger through the air pipe; the air pipe temperature sensor is used for detecting the temperature of the air pipe; the indoor fan is used for blowing air to the indoor heat exchanger, so that the indoor heat exchanger exchanges heat with the blown air; the controller is configured to control the air conditioning system to operate in a refrigeration mode in response to the high-temperature sterilization instruction, so that the indoor heat exchanger is frozen; when the air conditioning system operates in the refrigeration mode, the indoor fan is controlled to operate based on the air pipe temperature detected by the air pipe temperature sensor; and controlling the air-conditioning system to enter a high-temperature sterilization and deicing stage in response to the condition that the air-conditioning system reaches the icing exit condition.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to an air conditioning system and its control method. Background Technology

[0002] With increasing user demand for health features during air conditioner use, the high-temperature sterilization function of air conditioners has become a focus of attention for relevant technicians. The high-temperature sterilization function of air conditioners uses the high temperature of the indoor heat exchanger to inactivate bacteria and viruses. When the temperature of the indoor heat exchanger exceeds 56°C and remains so for 30 minutes, viruses can be inactivated.

[0003] However, the high-temperature sterilization function of current air conditioning systems only considers maintaining the temperature of the indoor heat exchanger above 56°C, without taking into account the impact of dust and other dirt on the sterilization effect. If a lot of dust and other dirt accumulates on the surface of the indoor heat exchanger, although the high temperature can inactivate viruses, bacteria will still continue to grow on the dirt, thus failing to achieve the best sterilization effect.

[0004] Therefore, how to improve the sterilization effect of air conditioning systems has become an urgent technical problem to be solved. Summary of the Invention

[0005] This application provides an air conditioning system and its control method to improve the sterilization effect of the air conditioning system.

[0006] To achieve the above objectives, this application adopts the following technical solution.

[0007] In a first aspect, embodiments of this application provide an air conditioning system, comprising: an outdoor heat exchanger; an indoor heat exchanger; a duct, one end of which is connected to the indoor heat exchanger and the other end of which is connected to the outdoor heat exchanger, such that the indoor heat exchanger is connected to the outdoor heat exchanger via the duct; a duct temperature sensor for detecting the temperature of the duct; an indoor fan for blowing air to the indoor heat exchanger to exchange heat between the indoor heat exchanger and the blown air; and a controller configured to: in response to a high-temperature sterilization command, control the air conditioning system to operate in a cooling mode to cause the indoor heat exchanger to freeze; during the operation of the air conditioning system in cooling mode, control the indoor fan to operate based on the duct temperature detected by the duct temperature sensor; and in response to the air conditioning system reaching the freezing exit condition, control the air conditioning system to enter a high-temperature sterilization and de-icing stage.

[0008] The technical solution provided in this application provides at least the following beneficial effects: This application provides an air conditioning system in which the controller can control the air conditioning system to enter the freezing stage before it enters the high-temperature sterilization stage, that is, to control the air conditioning system to operate in cooling mode, thereby causing the indoor heat exchanger to freeze. This prepares for the subsequent high-temperature sterilization stage, allowing the indoor heat exchanger to be cleaned while performing high-temperature sterilization, thus improving the sterilization effect.

[0009] Furthermore, during the cooling mode operation of the air conditioning system, the indoor fan operation can be controlled by the gas pipe temperature. Since the gas pipe temperature reflects the cooling effect of the air conditioning system, the better the cooling effect, the easier it is for ice to form on the surface of the indoor heat exchanger. Therefore, controlling the indoor fan operation by the gas pipe temperature can regulate the distribution of cold airflow, allowing the cold air generated by the indoor heat exchanger to better cover its surface, thereby enhancing the overall icing effect. Better icing results in easier separation of dust, bacteria, and other contaminants from the surface of the indoor heat exchanger, thus improving the sterilization effect of the air conditioning system.

[0010] In some embodiments, controlling the operation of an indoor fan based on the trachea temperature detected by a trachea temperature sensor includes: controlling the indoor fan to operate with a first operating parameter; after the indoor fan has been operating for a first preset duration, detecting the trachea temperature based on the trachea temperature sensor; controlling the indoor fan to continue operating if the trachea temperature meets a first condition; the first condition being that the trachea temperature remains below a first preset temperature for a second preset duration; controlling the indoor fan to stop operating if the trachea temperature meets a second condition; the second condition being that the trachea temperature remains above a second preset temperature for a second preset duration, wherein the second preset temperature is above the first preset temperature.

[0011] Based on the aforementioned technical means, this application provides an air conditioning system according to an exemplary embodiment. The controller can adjust the operating parameters of the indoor fan based on the gas pipe temperature after the indoor fan has been running at a first operating parameter for a period of time (a first preset duration). Since the gas pipe temperature reflects the cooling effect of the air conditioning system, if the cooling effect is poor after the indoor fan has been running at the first operating parameter for a period of time, continuing to run it at the current operating parameter may not improve the icing effect of the indoor heat exchanger, and may even affect it. Therefore, after the indoor fan has been running for a first preset duration, the operating parameters of the indoor fan can be dynamically adjusted based on the gas pipe temperature to improve the icing effect of the indoor heat exchanger.

[0012] In some embodiments, the controller is further configured to control the indoor fan to operate intermittently when the tracheal temperature does not meet the first and second conditions.

[0013] In some embodiments, the icing exit condition includes any one of the following: the air conditioning system operates in cooling mode for a duration of a third preset duration; the gas pipe temperature remains below a third preset temperature for a duration of a fourth preset duration; the gas pipe temperature remains below a fourth preset temperature for a duration of a fifth preset duration; wherein the third preset temperature is below the fourth preset temperature, and the fourth preset duration is below the fifth preset duration.

[0014] In some embodiments, the air conditioning system further includes: an indoor liquid pipe, one end of which is connected to an outdoor heat exchanger and the other end of which is connected to an indoor heat exchanger, such that the indoor heat exchanger is also connected to an outdoor heat exchanger via the indoor liquid pipe; a liquid pipe temperature sensor for detecting the indoor liquid pipe temperature; and a controller further configured to: control the air conditioning system to operate in heating mode in response to the air conditioning system entering the high-temperature sterilization and de-icing stage; and control the indoor fan to operate according to the current indoor liquid pipe temperature detected by the liquid pipe temperature sensor during the operation of the air conditioning system in heating mode, until the high-temperature sterilization and de-icing exit conditions are met.

[0015] Based on the aforementioned technical means, this application provides an air conditioning system according to an exemplary embodiment. During the high-temperature sterilization stage, the controller can control the operation of the indoor fan based on the indoor liquid pipe temperature. Since the indoor liquid pipe temperature reflects the heating effect of the air conditioning system, the better the heating effect, the easier it is for the ice layer on the surface of the indoor heat exchanger to melt. Therefore, controlling the operation of the indoor fan by the indoor liquid pipe temperature can adjust the distribution of hot airflow, allowing the hot airflow to not only melt the ice layer on the surface of the indoor heat exchanger more effectively, but also cover more areas inside the indoor unit, thereby improving the de-icing effect of the indoor heat exchanger and the sterilization effect of the entire indoor unit.

[0016] In some embodiments, controlling the operation of an indoor fan based on the current indoor liquid pipe temperature detected by a liquid pipe temperature sensor includes: determining the change in indoor liquid pipe temperature based on the current indoor liquid pipe temperature and historical indoor liquid pipe temperatures; if the change in indoor liquid pipe temperature is an increase, determining the operating parameters of the indoor fan corresponding to the current indoor liquid pipe temperature based on a first correspondence between the indoor liquid pipe temperature and the operating parameters of the indoor fan, wherein the first correspondence is positively correlated with the rotational speed of the indoor fan when operating at the operating parameters; if the change in indoor liquid pipe temperature is a decrease, determining the operating parameters of the indoor fan corresponding to the current indoor liquid pipe temperature based on a second correspondence between the indoor liquid pipe temperature and the operating parameters of the indoor fan, wherein the second correspondence is negatively correlated with the rotational speed of the indoor fan when operating at the operating parameters.

[0017] Based on the aforementioned technical means, this application provides an air conditioning system according to an exemplary embodiment. The controller can increase the speed of the indoor fan according to the operating parameters as the indoor liquid pipe temperature increases. Since the indoor liquid pipe temperature is rising, it indicates that the heating effect of the air conditioning system is improving. Therefore, as the indoor liquid pipe temperature increases, the indoor fan speed can be increased to accelerate the flow of hot air, thereby allowing the hot air to flow over a wider area and improving the high-temperature sterilization effect.

[0018] Conversely, when the temperature of the indoor liquid pipe decreases, the controller can reduce the speed of the indoor fan to avoid excessively rapid hot airflow that would prevent the hot airflow from being effectively distributed, thus affecting the coverage of the hot airflow and the high-temperature sterilization effect.

[0019] In some embodiments, the air conditioning system further includes: an ambient temperature sensor for detecting outdoor ambient temperature; a return air temperature sensor for detecting indoor return air temperature; a first correspondence relationship including: operating parameters corresponding to each of a plurality of first temperature ranges; a second correspondence relationship including: operating parameters corresponding to each of a plurality of second temperature ranges; wherein the range of the first temperature range and / or the range of the second temperature range are determined based on the outdoor ambient temperature detected by the ambient temperature sensor and the indoor return air temperature detected by the return air temperature sensor.

[0020] Based on the above technical means, this application provides an air conditioning system according to an exemplary embodiment. The controller can dynamically determine the range of a first temperature range and / or the range of a second temperature range based on the outdoor ambient temperature and the indoor return air temperature. Since the outdoor ambient temperature and the indoor return air temperature are relatively high, the indoor liquid pipe temperature does not need to be set too high, and the high-temperature sterilization effect can still be effectively achieved. Therefore, this method can improve energy efficiency and achieve the purpose of energy saving when the air conditioning system performs high-temperature sterilization.

[0021] In some embodiments, controlling the air conditioning system to enter the high-temperature sterilization and de-icing stage includes: controlling the air conditioning system to operate in air supply mode until the air conditioning system operates in air supply mode for a preset duration, and then controlling the air conditioning system to enter the high-temperature sterilization and de-icing stage.

[0022] Based on the above technical means, this application provides an air conditioning system according to an exemplary embodiment. When switching between cooling and heating modes, the controller can add a waiting stage, first controlling the air conditioning system to run in air supply mode for a period of time to balance the high pressure and low pressure before starting the compressor.

[0023] Secondly, embodiments of this application provide a control method for an air conditioning system. The method is applied to an air conditioning system and includes: in response to a high-temperature sterilization command, controlling the air conditioning system to operate in a cooling mode to cause the indoor heat exchanger to freeze; during the operation of the air conditioning system in cooling mode, controlling the indoor fan to operate based on the gas pipe temperature detected by the gas pipe temperature sensor; and in response to the air conditioning system reaching the freezing exit condition, controlling the air conditioning system to enter a high-temperature sterilization and de-icing stage.

[0024] Thirdly, embodiments of this application provide a controller, including: one or more processors; one or more memories; wherein the one or more memories are used to store computer program code, the computer program code including computer instructions, and when the one or more processors execute the computer instructions, the controller executes any of the air conditioning system control methods provided in the second aspect.

[0025] Fourthly, embodiments of this application provide a computer-readable storage medium including computer instructions that, when executed on a computer, cause the computer to perform any of the air conditioning system control methods provided in the second aspect.

[0026] Fifthly, embodiments of the present invention provide a computer program product that can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can realize any of the air conditioning system control methods provided in the second aspect.

[0027] It should be noted that the aforementioned computer instructions may be stored, in whole or in part, on a computer-readable storage medium. This computer-readable storage medium may be packaged together with the controller's processor, or it may be packaged separately from the controller's processor; this application does not impose any limitations on this.

[0028] The beneficial effects described in aspects two through five of this application can be referred to the analysis of the beneficial effects of aspect one, and will not be repeated here. Attached Figure Description

[0029] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0030] Figure 1 This is a schematic diagram of the composition of an air conditioning system provided in an embodiment of this application;

[0031] Figure 2 A schematic diagram of the refrigerant circuit of an air conditioning system provided in this application embodiment;

[0032] Figure 3A schematic diagram illustrating the principle of an air conditioning system operating in heating mode, provided as an embodiment of this application;

[0033] Figure 4 A schematic diagram illustrating the principle of an air conditioning system operating in cooling mode, provided in an embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the refrigerant circuit of another air conditioning system provided in an embodiment of this application;

[0035] Figure 6 A hardware configuration block diagram of an air conditioning system provided in an embodiment of this application;

[0036] Figure 7 A flowchart of a control method for an air conditioning system provided in an embodiment of this application;

[0037] Figure 8 A flowchart illustrating another control method for an air conditioning system provided in this application embodiment;

[0038] Figure 9 A schematic diagram illustrating a first correspondence between indoor liquid pipe temperature and indoor fan operating parameters, provided for an embodiment of this application;

[0039] Figure 10 This is a schematic diagram illustrating a second correspondence between indoor liquid pipe temperature and indoor fan operating parameters, provided as an embodiment of this application. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0044] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0045] To improve the sterilization effect of air conditioning systems, this application provides a control method for an air conditioning system. Before controlling the air conditioning system to enter the high-temperature sterilization stage, the system can be controlled to enter the icing stage, that is, to operate the air conditioning system in cooling mode, thereby causing the indoor heat exchanger to freeze. This prepares the system for the subsequent high-temperature sterilization stage, allowing the indoor heat exchanger to be cleaned simultaneously with high-temperature sterilization, thus improving the sterilization effect.

[0046] Furthermore, during the cooling mode operation of the air conditioning system, the indoor fan operation can be controlled by the gas pipe temperature. Since the gas pipe temperature reflects the cooling effect of the air conditioning system, the better the cooling effect, the easier it is for ice to form on the surface of the indoor heat exchanger. Therefore, controlling the indoor fan operation by the gas pipe temperature can regulate the distribution of cold airflow, allowing the cold air generated by the indoor heat exchanger to better cover its surface, thereby enhancing the overall icing effect. Better icing results in easier separation of dust, bacteria, and other contaminants from the surface of the indoor heat exchanger, thus improving the sterilization effect of the air conditioning system.

[0047] In the embodiments of this application, the air conditioning system can be a unitary air conditioner or a multi-split air conditioner. This application does not limit the type of air conditioning system.

[0048] The basic operating principle of an air conditioning system is illustrated below.

[0049] In this application, the air conditioning system executes a refrigeration cycle using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0050] The compressor compresses refrigerant gas under high temperature and pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0051] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioning system regulates the temperature of the indoor space.

[0052] The outdoor unit of an air conditioning system refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioning system includes the indoor heat exchanger, and the expansion valve can be provided in either the indoor or outdoor unit.

[0053] Indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioning system functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioning system functions as a cooler in cooling mode.

[0054] Figure 1 This is a schematic diagram illustrating the composition of an air conditioning system provided in accordance with an exemplary embodiment of this application. Figure 1 As shown, the air conditioning system may include an indoor unit 101. The indoor unit 101 is typically installed indoors and is used to regulate the temperature and humidity of the indoor air.

[0055] In some embodiments, the air conditioning system may include an outdoor unit 102. The outdoor unit 102 is typically located outdoors and is used for heat exchange with the indoor environment.

[0056] In some embodiments, connecting pipes are used to connect the indoor unit 101 and the outdoor unit 102 to form a refrigerant circuit for refrigerant circulation, through which a vapor compression refrigeration cycle can be performed.

[0057] This connecting piping, also known as gas-liquid piping, includes a gas pipe for transporting gaseous refrigerant and a liquid pipe for transporting two-phase refrigerant. It should be noted that the indoor unit 101 and the outdoor unit 101 can be connected via gas and liquid pipes; that is, the indoor heat exchanger and the outdoor heat exchanger are also connected via gas and liquid pipes.

[0058] In some embodiments, such as Figure 2As shown, the refrigerant circuit may include a compressor 201. The compressor 201 draws in refrigerant through a suction port and discharges the internally compressed refrigerant to the indoor heat exchanger 205 through a discharge port. For example, the compressor 201 may be a variable-capacity inverter compressor with inverter-based speed control.

[0059] In some embodiments, the refrigerant circuit may include an outdoor heat exchanger 202. The outdoor heat exchanger 202 has a first inlet / outlet for allowing refrigerant to flow through a receiver 204 between itself and the suction port of the compressor 201, and a second inlet / outlet for allowing refrigerant to flow between itself and an expansion valve 203. The outdoor heat exchanger 202 facilitates heat exchange between refrigerant flowing in a heat transfer tube connected between the second and first inlets / outlets of the outdoor heat exchanger 202 and outdoor air.

[0060] In some embodiments, the refrigerant circuit may include an expansion valve 203. The expansion valve 203 is disposed between the outdoor heat exchanger 202 and the indoor heat exchanger 205. The expansion valve 203 has the function of expanding and depressurizing the refrigerant flowing between the outdoor heat exchanger 202 and the indoor heat exchanger 205. The expansion valve 203 is configured to change its opening degree; by decreasing the opening degree, the flow resistance of the refrigerant flowing through the expansion valve 203 increases, and by increasing the opening degree, the flow resistance of the refrigerant flowing through the expansion valve 203 decreases. Such an expansion valve 203 expands and depressurizes the refrigerant flowing from the indoor heat exchanger 205 towards the outdoor heat exchanger 202 during heating operation. Furthermore, even if the states of other components installed in the refrigerant circuit remain unchanged, the flow rate of the refrigerant flowing in the refrigerant circuit will change when the opening degree of the expansion valve 203 changes.

[0061] In some embodiments, the refrigerant circuit may include a receiver 204. In the receiver 204, the refrigerant flowing from the outdoor heat exchanger 202 to the compressor 201 is separated into gaseous refrigerant and liquid refrigerant. Furthermore, gaseous refrigerant is primarily supplied from the receiver 204 to the suction port of the compressor 201.

[0062] In some embodiments, the refrigerant circuit may include an indoor heat exchanger 205. The indoor heat exchanger 205 has a second inlet for allowing liquid refrigerant to flow between an expansion valve 203 and a first inlet for allowing gaseous refrigerant to flow between an outlet of the compressor 201 and a outlet. The indoor heat exchanger 205 facilitates heat exchange between refrigerant flowing in a heat transfer tube connected between the second and first inlets of the indoor heat exchanger 205 and indoor air.

[0063] In some embodiments, the indoor unit 101 may include an indoor fan. The indoor fan is used to blow air to the indoor heat exchanger 205 so that the indoor heat exchanger 205 exchanges heat with the blown air.

[0064] Based on the above refrigerant circuit, the principle of the air conditioning system operating in heating mode is as follows:

[0065] like Figure 3 As shown, when the air conditioning system is operating in heating mode, the high-temperature, high-pressure refrigerant discharged from the compressor 201 flows into the indoor heat exchanger 205. At this time, the indoor heat exchanger 205 functions as a radiator. Therefore, the refrigerant, flowing through the indoor heat exchanger 205, heats the indoor air through heat exchange with it and cools itself by dissipating heat. The low-temperature, high-pressure refrigerant, having lost heat to the indoor heat exchanger 205, is depressurized by the expansion valve 203, becoming a low-temperature, low-pressure refrigerant. The refrigerant flowing through the expansion valve 203 into the outdoor heat exchanger 202 is heated through heat exchange with the outdoor air. At this time, the outdoor heat exchanger 202 functions as an evaporator. Then, mainly low-temperature gaseous refrigerant is drawn from the outdoor heat exchanger 202 into the compressor 201 via the receiver 204.

[0066] Based on the above refrigerant circuit, the principle of the air conditioning system operating in cooling mode is as follows:

[0067] like Figure 4 As shown, the high-temperature, high-pressure refrigerant discharged from the compressor 201 flows into the outdoor heat exchanger 202. At this time, the outdoor heat exchanger 202 functions as a radiator. Therefore, the refrigerant, flowing in the outdoor heat exchanger 202, heats the outdoor air through heat exchange with it and cools itself by dissipating heat. The low-temperature, high-pressure refrigerant, having lost heat to the outdoor heat exchanger 202, is depressurized by the expansion valve 203, becoming a low-temperature, low-pressure refrigerant. The refrigerant flowing into the indoor heat exchanger 205 after passing through the expansion valve 203 is heated through heat exchange with the indoor air. At this time, the indoor heat exchanger 205 functions as an evaporator. Then, mainly low-temperature gaseous refrigerant is drawn from the indoor heat exchanger 205 into the compressor 201 via the receiver 204.

[0068] In some embodiments, in response to a high-temperature sterilization command, the air conditioning system first needs to enter an icing stage and operate in cooling mode during this stage. Then, it needs to enter a high-temperature sterilization stage and operate in heating mode during this stage to sterilize the air conditioning system at high temperatures. This is because, in order to achieve the switching between cooling and heating modes, such as... Figure 5As shown, the refrigerant circuit may further include a four-way switching valve 501. In addition to a first port, the four-way switching valve 501 has a second port connected to the outdoor heat exchanger 202, a third port connected to the receiver 204, and a fourth port connected to the indoor heat exchanger 205. When the air conditioning system is operating in heating mode, the four-way switching valve 501 allows refrigerant to flow between the first and fourth ports, and simultaneously allows refrigerant to flow between the second and third ports (for...). Figure 5 (The state shown by the dashed line). Furthermore, when the air conditioning system is running in cooling mode, the four-way switch 501 allows refrigerant to flow between the first and second ports, and simultaneously allows refrigerant to flow between the third and fourth ports (for...). Figure 5 (The state shown by the solid line).

[0069] Figure 6 This is a hardware configuration block diagram of an air conditioning system provided in accordance with an exemplary embodiment of this application. Figure 6 As shown, the air conditioning system may include a duct temperature sensor 601. The duct temperature sensor can be installed on the duct to detect the temperature of the duct.

[0070] In some embodiments, the air conditioning system may include a liquid pipe temperature sensor 602. The liquid pipe temperature sensor may be disposed on the liquid pipe for detecting the temperature of the liquid pipe.

[0071] In some embodiments, the air conditioning system may include a memory 603. The memory 603 can be used to store software programs and data. The controller 605 executes various functions of the air conditioning system and performs data processing by running the software programs or data stored in the memory 603. The memory 603 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. The memory 603 stores an operating system that enables the air conditioning system to run. In this application, the memory 603 may store the operating system and various application programs, and may also store code that executes the control method of the air conditioning system provided in the embodiments of this application.

[0072] In some embodiments, the air conditioning system may include a communicator 604. The communicator 604 is used to establish communication connections with other network entities, such as establishing communication connections with terminal devices. The communicator 604 may include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module, etc. Taking an RF module as an example, the RF module can be used for signal reception and transmission; specifically, it sends received information to the controller 605 for processing; additionally, it transmits signals generated by the controller 605. Typically, the RF circuit may include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc.

[0073] In some embodiments, the air conditioning system may include a controller 605. Controller 605 refers to a device that can generate operation control signals based on instruction opcodes and timing signals, instructing the air conditioning system to execute control commands. Exemplarily, the controller may be a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller may also be other devices with processing functions, such as circuits, devices, or software modules; this application embodiment does not impose any limitations on this.

[0074] In addition, the controller 605 can be used to control the operation of various components inside the air conditioning system so that the operation of each component of the air conditioning system can realize the predetermined functions of the air conditioning system, such as the high-temperature sterilization function.

[0075] Those skilled in the art will understand that Figure 6 The hardware structure shown does not constitute a limitation on the air conditioning system. The air conditioning system may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0076] After prolonged use, air conditioning systems easily accumulate dust and other dirt inside. This dirt not only affects air quality but can also be transmitted through the air, causing respiratory illnesses and impacting user health. Therefore, air conditioning systems need to be equipped with a high-temperature sterilization function to effectively remove this dirt, ensure air quality, and prevent the spread of disease. To perform high-temperature sterilization on the air conditioning system, such as... Figure 7 As shown, the controller 605 can achieve the high-temperature sterilization function of the air conditioning system through the following operations.

[0077] S101, in response to the high-temperature sterilization command, controls the air conditioning system to operate in cooling mode so that the indoor heat exchanger freezes.

[0078] In some possible embodiments, in response to a high-temperature sterilization command, the air conditioning system can be controlled to immediately operate in cooling mode to cause the indoor heat exchanger to freeze.

[0079] In other possible embodiments, in response to a high-temperature sterilization command, the air conditioning system can determine whether the current environment meets preset conditions. If the current environment meets the preset conditions, the air conditioning system can be controlled to operate in cooling mode. These preset conditions may include an outdoor ambient temperature reaching a first temperature threshold and an indoor ambient temperature reaching a second temperature threshold.

[0080] For example, users can issue a high-temperature sterilization command through, but not limited to, the relevant buttons on the operating interface of the air conditioner remote control or the air conditioner system itself. After receiving the high-temperature sterilization command, the air conditioner system will control the air conditioner system to operate in cooling mode.

[0081] In some embodiments, when the air conditioning system is operating in cooling mode, the indoor fan is controlled to operate based on the duct temperature detected by the duct temperature sensor.

[0082] Understandably, the temperature of the gas pipes reflects the cooling effect of the air conditioning system. The better the cooling effect, the easier it is for ice to form on the surface of the indoor heat exchanger. By controlling the operation of the indoor fan, the distribution of cold air can be adjusted, allowing the cooling energy generated by the indoor heat exchanger to better cover its surface, thus enhancing the overall icing effect. Better icing also makes it easier for dust, bacteria, and other contaminants to separate from the surface of the indoor heat exchanger, thereby improving the sterilization effect of the air conditioning system.

[0083] In some possible embodiments, the operating parameters of the indoor fan, such as the speed setting of the indoor fan, can be determined based on the air duct temperature, and the indoor fan can be controlled to operate at that speed setting.

[0084] S102. In response to the air conditioning system reaching the freezing exit condition, control the air conditioning system to enter the high-temperature sterilization stage.

[0085] Understandably, when an air conditioning system reaches the icing exit condition, it means the indoor heat exchanger has fully frozen. Sufficient freezing effectively separates dust, bacteria, and other contaminants from the heat exchanger's surface. Therefore, in response to the system reaching the icing exit condition, the system can be controlled to exit the icing stage and enter a high-temperature sterilization stage. This maintains a high temperature on the indoor heat exchanger for defrosting. The condensate produced during defrosting washes away dust, bacteria, and other contaminants from the heat exchanger's surface, achieving a self-cleaning effect. Simultaneously, the high temperature of the heat exchanger inactivates bacteria and viruses. In this way, both self-cleaning and high-temperature sterilization functions of the indoor heat exchanger are achieved simultaneously, thus improving the sterilization effect of the air conditioning system.

[0086] In some embodiments, the icing exit condition may include any of the following:

[0087] (1) The air conditioning system operates in cooling mode for a period of time until the third preset duration is reached.

[0088] Understandably, when an air conditioning system operates in cooling mode, the indoor heat exchanger may freeze. If the air conditioning system operates in cooling mode for a certain duration (the third preset duration), it indicates that the indoor heat exchanger is sufficiently frozen. Therefore, the air conditioning system can be controlled to exit the freezing phase when the third preset duration of operation in cooling mode has been reached.

[0089] The term "the duration of operation of the air conditioning system in cooling mode reaching the third preset duration" can mean that the duration of operation of the air conditioning system in cooling mode is greater than the third preset duration, or it can mean that the duration of operation of the air conditioning system in cooling mode is greater than or equal to the third preset duration. This application does not limit this to any particular duration.

[0090] For example, when the air conditioning system has been running in cooling mode for 12 minutes, the system can be controlled to exit the icing stage.

[0091] (2) The duration for which the tracheal temperature remains below the third preset temperature reaches the fourth preset duration.

[0092] Understandably, if the gas pipe temperature is below the third preset temperature, it means that the gas pipe temperature is low and the air conditioning system has a good cooling effect. In this case, if the duration reaches the fourth preset duration, it means that the indoor heat exchanger has been fully frozen.

[0093] For example, the duration of tracheal temperature below -23°C reached 7 minutes.

[0094] (3) The duration for which the tracheal temperature remains below the fourth preset temperature reaches the fifth preset duration.

[0095] Among them, the third preset temperature is below the fourth preset temperature, and the fourth preset duration is below the fifth preset duration.

[0096] Understandably, since the third preset temperature is below the fourth preset temperature, if the duration for which the gas pipe temperature remains below the fourth preset temperature is only the fourth preset duration, it may not be sufficient for a adequate ice layer to form on the surface of the indoor heat exchanger. Therefore, a longer duration (i.e., the fifth preset duration) is required to ensure that the surface temperature of the indoor heat exchanger is maintained at the low temperature required for icing for an extended period.

[0097] For example, the duration of tracheal temperature below -17°C reached 9 minutes.

[0098] In some embodiments, in response to the air conditioning system reaching the icing exit condition, the air conditioning system is first controlled to operate in air supply mode until the air supply mode operation time reaches a preset duration, and then the air conditioning system is controlled to enter the high-temperature sterilization and de-icing stage. That is to say, before controlling the air conditioning system to enter the high-temperature sterilization stage, the air conditioning system is first controlled to enter the waiting stage.

[0099] Understandably, the icing stage aims to control the icing of the indoor heat exchanger, which is essentially cooling, while the high-temperature sterilization stage aims to control the defrosting of the indoor heat exchanger, which is essentially heating. Therefore, after the air conditioning system enters the high-temperature sterilization stage, it is necessary to switch between cooling and heating modes by controlling the four-way valve. However, this switching process inevitably involves a switch between high and low pressure, i.e., the indoor heat exchanger switches from the low-pressure side to the high-pressure side, and the outdoor heat exchanger switches from the high-pressure side to the low-pressure side. If the system is not shut down during the switching between high and low pressure, many problems may occur, such as the controller reporting a compressor drive synchronization failure; the internal slider of the four-way switching valve being damaged by impact; and the refrigerant impact noise being very noticeable during the switching of the four-way switching valve. Therefore, when switching between cooling and heating modes, a waiting period can be added, first controlling the air conditioning system to run in fan mode for a period of time to allow the high and low pressures to balance before starting the compressor.

[0100] Based on S101-S102, this application provides an air conditioning system according to an exemplary embodiment. Before controlling the air conditioning system to enter the high-temperature sterilization stage, the controller of this air conditioning system can first control the air conditioning system to enter the icing stage, that is, control the air conditioning system to operate in cooling mode, thereby causing the indoor heat exchanger to freeze. This prepares the system for the subsequent high-temperature sterilization stage, allowing the indoor heat exchanger to be cleaned simultaneously with high-temperature sterilization, thus improving the sterilization effect.

[0101] Furthermore, during the cooling mode operation of the air conditioning system, the indoor fan operation can be controlled by the gas pipe temperature. Since the gas pipe temperature reflects the cooling effect of the air conditioning system, the better the cooling effect, the easier it is for ice to form on the surface of the indoor heat exchanger. Therefore, controlling the indoor fan operation by the gas pipe temperature can regulate the distribution of cold airflow, allowing the cold air generated by the indoor heat exchanger to better cover its surface, thereby enhancing the overall icing effect. Better icing results in easier separation of dust, bacteria, and other contaminants from the surface of the indoor heat exchanger, thus improving the sterilization effect of the air conditioning system.

[0102] In some embodiments, to improve the icing effect on the surface of the indoor heat exchanger, such as Figure 8 As shown. When the controller 605 in the air conditioning system provided in this application executes S102, it can specifically perform the following operations:

[0103] S201, Control the indoor fan to operate at the first operating parameter.

[0104] The first operating speed may include speed gear, speed, voltage, current, etc.

[0105] For example, the indoor fan can be controlled to operate at a preset speed setting to create a gentle breeze around the indoor heat exchanger.

[0106] S202. After the indoor fan has been running for a first preset period of time, the airway temperature is detected based on the airway temperature sensor.

[0107] Understandably, if the gas pipe temperature is high after the indoor fan has been running for the first preset time, it indicates that the air conditioning system's cooling effect is relatively poor. Continuing to operate the indoor fan at the initial parameters at this point might blow relatively hot air towards the indoor heat exchanger, reducing its icing effect and impacting subsequent high-temperature sterilization. Therefore, after the indoor fan has been running for the first preset time, a gas pipe temperature sensor can be used to monitor the gas pipe temperature in real time, allowing for dynamic adjustment of the indoor fan's operating parameters based on the gas pipe temperature.

[0108] For example, the first preset duration can be 3 minutes. After the indoor fan has been running for 3 minutes, the trachea temperature is detected based on the trachea temperature sensor.

[0109] S203. If the gas pipe temperature meets the first condition, control the indoor fan to continue operating.

[0110] The first condition is that the duration for which the tracheal temperature remains below a first preset temperature reaches a second preset duration.

[0111] Understandably, if the gas pipe temperature remains below the first preset temperature for a duration equal to the second preset duration, it indicates that the current cooling effect of the air conditioning system is relatively good, so the indoor fan can continue to operate at the first operating parameter.

[0112] For example, the first preset temperature can be -5℃, and the second preset duration can be 2 minutes. Based on the example in S202, if the indoor fan operates at the first operating parameter for 3 minutes, and the air pipe temperature remains below -5℃ for 2 minutes, then the indoor fan is controlled to continue operating at the first operating parameter.

[0113] S204. When the gas pipe temperature meets the second condition, control the indoor fan to stop operating.

[0114] The second condition is that the duration of the tracheal temperature being above the second preset temperature reaches the second preset duration, and the second preset temperature is above the first preset temperature.

[0115] Understandably, if the gas pipe temperature remains below the first preset temperature for a duration equal to the second preset duration, it indicates that the current cooling effect of the air conditioning system is relatively poor. Therefore, the indoor fan can be stopped, and after reducing airflow, the cooling capacity generated by the indoor heat exchanger can be concentrated on the indoor heat exchanger, thereby improving the icing effect of the indoor heat exchanger.

[0116] For example, the second preset temperature can be 0℃, and the second preset duration can be 2 minutes. Based on the example in S202, if the indoor fan operates with the first operating parameters for 3 minutes, and if the air pipe temperature is greater than or equal to -5℃ for 2 minutes, then the indoor fan is controlled to stop operating.

[0117] As another feasible approach, if the tracheal temperature does not meet the first and second conditions, the indoor fan can be controlled to operate intermittently.

[0118] For example, based on the examples in S202, S203 and S204, if the indoor fan operates at the first operating parameter for 3 minutes, and the air pipe temperature is greater than or equal to -5°C and the duration of being less than 0°C reaches 2 minutes, then the indoor fan is controlled to stop operating for a period of time (e.g., 6 minutes) before being controlled to operate at the first operating parameter again.

[0119] Based on S201-S204, this application provides an air conditioning system according to an exemplary embodiment. The controller can adjust the operating parameters of the indoor fan based on the gas pipe temperature after controlling the indoor fan to run at a first operating parameter for a period of time (a first preset duration). Since the gas pipe temperature reflects the cooling effect of the air conditioning system, if the cooling effect is poor after the indoor fan has run at the first operating parameter for a period of time, continuing to run it at the current operating parameter may not improve the icing effect of the indoor heat exchanger, and may even affect it. Therefore, after the indoor fan has run for a first preset duration, the operating parameters of the indoor fan can be dynamically adjusted based on the gas pipe temperature to improve the icing effect of the indoor heat exchanger.

[0120] In some embodiments, in order to improve the sterilization effect of the high-temperature sterilization stage, the controller 605 in an air conditioning system provided in this application, when executing S103, can specifically perform the following operations:

[0121] S301. In response to the air conditioning system entering the high-temperature sterilization stage, control the air conditioning system to operate in heating mode.

[0122] S302. During the operation of the air conditioning system in heating mode, the indoor fan is controlled to operate based on the current indoor liquid pipe temperature detected by the liquid pipe temperature sensor until the high-temperature sterilization exit condition is reached.

[0123] Understandably, the indoor liquid pipe temperature reflects the heating effect of the air conditioning system. The better the heating effect of the air conditioning system, the easier it is for the ice layer on the surface of the indoor heat exchanger to melt. By controlling the operation of the indoor fan, the distribution of hot airflow can be adjusted, so that the hot airflow can not only melt the ice layer on the surface of the indoor heat exchanger more effectively, but also cover more areas inside the indoor unit, thereby improving the de-icing effect of the indoor heat exchanger and the sterilization effect of the entire indoor unit.

[0124] In some possible embodiments, the operating parameters of the indoor fan, such as the speed setting of the indoor fan, can be determined based on the temperature of the indoor liquid pipe, and the indoor fan can be controlled to operate at that speed setting.

[0125] Based on S301-S302, this application provides an air conditioning system according to an exemplary embodiment. During the high-temperature sterilization stage, the controller controls the operation of the indoor fan based on the indoor liquid pipe temperature. Since the indoor liquid pipe temperature reflects the heating effect of the air conditioning system, the better the heating effect, the easier it is for the ice layer on the surface of the indoor heat exchanger to melt. Therefore, controlling the operation of the indoor fan by the indoor liquid pipe temperature can adjust the distribution of hot airflow, allowing the hot airflow to not only melt the ice layer on the surface of the indoor heat exchanger more effectively, but also cover more areas inside the indoor unit, thereby improving the de-icing effect of the indoor heat exchanger and the sterilization effect of the entire indoor unit.

[0126] S401. Determine the changes in indoor liquid pipe temperature based on the current indoor liquid pipe temperature and historical indoor liquid pipe temperatures.

[0127] The changes in the temperature of the indoor liquid pipe include both temperature increases and temperature decreases.

[0128] In some possible embodiments, the change in indoor liquid pipe temperature can be determined based on the difference between the current indoor liquid pipe temperature and the historical liquid pipe temperature.

[0129] For example, the difference between the current indoor liquid pipe temperature and the historical liquid pipe temperature can be determined using the following formula (1). If the difference is positive, it indicates that the indoor liquid pipe temperature is rising. If the difference is negative, it indicates that the indoor liquid pipe temperature is falling.

[0130] ΔT=T1-T2 Formula (1)

[0131] Where ΔT is the difference between the current indoor liquid pipe temperature and the historical liquid pipe temperature; T1 is the current indoor liquid pipe temperature; and T2 is the historical liquid pipe temperature.

[0132] S402. When the indoor liquid pipe temperature changes to an upward trend, determine the operating parameters of the indoor fan corresponding to the current indoor liquid pipe temperature based on the first correspondence between the indoor liquid pipe temperature and the operating parameters of the indoor fan.

[0133] In the first correspondence, the indoor liquid pipe temperature is positively correlated with the indoor fan speed when operating at the specified parameters. The operating parameters may include the indoor fan speed setting.

[0134] Understandably, if the indoor liquid pipe temperature rises, it indicates that the air conditioning system is heating more effectively. Therefore, as the indoor liquid pipe temperature increases, the indoor fan speed can be increased to accelerate the flow of hot air, allowing it to circulate over a wider area and improving the high-temperature sterilization effect.

[0135] In some embodiments, the first correspondence between the indoor liquid pipe temperature and the operating parameters of the indoor fan includes: the operating parameters corresponding to each of the plurality of first temperature ranges.

[0136] For example, such as Figure 9 As shown, the first correspondence between the indoor liquid pipe temperature and the operating parameters of the indoor fan may include: (1) when the indoor liquid pipe temperature is below the first liquid pipe temperature threshold, the speed of the indoor fan is the first preset speed.

[0137] (2) When the indoor liquid pipe temperature is above the first liquid pipe temperature threshold and below the second liquid pipe temperature threshold, the indoor fan speed setting is the second preset setting. Wherein, the second liquid pipe temperature threshold is above the first liquid pipe temperature threshold, and the speed corresponding to the second preset setting is above the speed corresponding to the first preset setting.

[0138] (3) When the indoor liquid pipe temperature is above the second liquid pipe temperature threshold, the indoor fan speed setting is the third preset setting. The speed corresponding to the third preset setting is above the speed corresponding to the second preset setting.

[0139] The temperature threshold of the first liquid tube can be 50°C, the temperature threshold of the second liquid tube can be 52°C, and the temperature threshold of the third liquid tube can be 54°C. These thresholds can be set according to actual needs, and this application does not limit them.

[0140] S403. When the indoor liquid pipe temperature changes by decreasing, determine the indoor fan operating parameters corresponding to the current indoor liquid pipe temperature based on the second correspondence between the indoor liquid pipe temperature and the indoor fan operating parameters.

[0141] In the second correspondence, the indoor liquid pipe temperature is negatively correlated with the speed of the indoor fan when it is running at the operating parameters.

[0142] Understandably, if the temperature of the indoor liquid pipe decreases, it indicates that the heating effect of the air conditioning system is getting worse. Therefore, as the temperature of the indoor liquid pipe decreases, the speed of the indoor fan can be reduced to avoid the hot airflow being too fast and unable to be effectively distributed, thus affecting the coverage of the hot airflow and the high-temperature sterilization effect.

[0143] In some embodiments, the second correspondence between the indoor liquid pipe temperature and the operating parameters of the indoor fan includes the operating parameters corresponding to each of the plurality of second temperature ranges.

[0144] For example, such as Figure 10 As shown, the second correspondence between the indoor liquid pipe temperature and the operating parameters of the indoor fan may include: (1) when the indoor liquid pipe temperature is above the second liquid pipe temperature threshold, the speed setting of the indoor fan is the third preset setting.

[0145] (2) When the indoor liquid pipe temperature is above the third liquid pipe temperature threshold and below the first liquid pipe temperature threshold, the indoor fan speed setting is the second preset setting. Wherein, the third liquid pipe temperature threshold is below the first liquid pipe temperature threshold.

[0146] (3) When the temperature of the indoor liquid pipe is below the third liquid pipe temperature threshold, the speed of the indoor fan is the first preset speed.

[0147] Based on S401-S403 above, the controller in the air conditioning system can increase the speed of the indoor fan according to the operating parameters when the indoor liquid pipe temperature is rising, as the current indoor liquid pipe volume increases. Since the indoor liquid pipe temperature is rising, it indicates that the heating effect of the air conditioning system is improving. Therefore, as the indoor liquid pipe temperature increases, the indoor fan speed can be increased to accelerate the flow of hot air, thereby allowing the hot air to circulate over a wider area and improving the high-temperature sterilization effect.

[0148] Conversely, when the temperature of the indoor liquid pipe decreases, the controller can reduce the speed of the indoor fan to avoid excessively rapid hot airflow that would prevent the hot airflow from being effectively distributed, thus affecting the coverage of the hot airflow and the high-temperature sterilization effect.

[0149] In some embodiments, the range of the first temperature range and / or the range of the second temperature range are determined based on the outdoor ambient temperature detected by the ambient temperature sensor and the indoor return air temperature detected by the return air temperature sensor. Based on the examples in S402 and S403, that is, at least one of the first liquid pipe temperature threshold, the second liquid pipe temperature threshold, and the third liquid pipe temperature threshold can be determined based on the outdoor ambient temperature and the indoor return air temperature.

[0150] Understandably, if the outdoor ambient temperature and the indoor return air temperature are high, the indoor liquid pipe temperature does not need to be set too high to effectively achieve high-temperature sterilization. Therefore, the range of the first temperature range and / or the range of the second temperature range can be dynamically determined based on the outdoor ambient temperature and the indoor return air temperature, thereby improving energy efficiency and achieving energy saving when the air conditioning system performs high-temperature sterilization.

[0151] In some possible embodiments, when the outdoor ambient temperature is above the ambient temperature threshold and the indoor return air temperature is below the return air temperature threshold, the first liquid pipe temperature threshold, the second liquid pipe temperature threshold, and the third liquid pipe temperature threshold can be reduced.

[0152] The ambient temperature threshold and the return air temperature threshold can be set according to actual needs. For example, the ambient temperature threshold can be 25°C and the return air temperature threshold can be 25°C. This application does not limit this.

[0153] For example, when the outdoor ambient temperature is greater than the ambient temperature threshold of 25°C and the indoor return air temperature is greater than 25°C, the temperature threshold of the first liquid pipe can be reduced from 50°C to 45°C, the temperature threshold of the second liquid pipe can be reduced from 52°C to 48°C, and the temperature threshold of the third liquid pipe can be reduced from 54°C to 50°C.

[0154] In some possible embodiments, under other conditions (except when the outdoor ambient temperature is above the ambient temperature threshold and the indoor return air temperature is below the return air temperature threshold), the first liquid pipe temperature threshold, the second liquid pipe temperature threshold, and the third liquid pipe temperature threshold can be increased. For example, the first liquid pipe temperature threshold can be increased from 50°C to 53°C, the second liquid pipe temperature threshold from 52°C to 55°C, and the third liquid pipe temperature threshold from 54°C to 60°C.

[0155] In some embodiments, after determining the first liquid pipe temperature threshold, the second liquid pipe temperature threshold, and the third liquid pipe temperature threshold, the determined first liquid pipe temperature threshold, the second liquid pipe temperature threshold, and the third liquid pipe temperature threshold can be dynamically updated to new first liquid pipe temperature threshold, second liquid pipe temperature threshold, and third liquid pipe temperature threshold by modifying the configuration information in the electrically erasable programmable read-only memory (EEPROM).

[0156] The following describes a control method for an air conditioning system according to a second aspect embodiment of this application. The control method for the air conditioning system includes at least the following:

[0157] In response to a high-temperature sterilization command, the air conditioning system is controlled to operate in cooling mode to cause the indoor heat exchanger to freeze; during the operation of the air conditioning system in cooling mode, the indoor fan is controlled to operate based on the gas pipe temperature detected by the gas pipe temperature sensor; in response to the air conditioning system reaching the freezing exit condition, the air conditioning system is controlled to enter the high-temperature sterilization and de-icing stage.

[0158] In some embodiments, the method further includes: in response to the air conditioning system entering the high-temperature sterilization and de-icing stage, controlling the air conditioning system to operate in heating mode; during the operation of the air conditioning system in heating mode, controlling the indoor fan to operate according to the current indoor liquid pipe temperature detected by the liquid pipe temperature sensor until the high-temperature sterilization and de-icing exit conditions are met.

[0159] In summary, the air conditioner control method provided in this application, according to an exemplary embodiment, can control the air conditioning system to enter an icing stage before controlling it to enter the high-temperature sterilization stage. That is, it controls the air conditioning system to operate in cooling mode, thereby causing the indoor heat exchanger to freeze. This prepares the system for the subsequent high-temperature sterilization stage, allowing the indoor heat exchanger to be cleaned simultaneously with high-temperature sterilization, thus improving the sterilization effect.

[0160] Furthermore, during the cooling mode operation of the air conditioning system, the indoor fan operation can be controlled by the gas pipe temperature. Since the gas pipe temperature reflects the cooling effect of the air conditioning system, the better the cooling effect, the easier it is for ice to form on the surface of the indoor heat exchanger. Therefore, controlling the indoor fan operation by the gas pipe temperature can regulate the distribution of cold airflow, allowing the cold air generated by the indoor heat exchanger to better cover its surface, thereby enhancing the overall icing effect. Better icing results in easier separation of dust, bacteria, and other contaminants from the surface of the indoor heat exchanger, thus improving the sterilization effect of the air conditioning system.

[0161] Those skilled in the art will recognize that, in one or more of the examples above, the functions described in this invention can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium accessible to a general-purpose or special-purpose computer.

[0162] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An air conditioning system, characterized in that, include: Outdoor heat exchanger; Indoor heat exchanger; A duct is connected at one end to the indoor heat exchanger and at the other end to the outdoor heat exchanger, so that the outdoor heat exchanger is connected to the indoor heat exchanger through the duct. A trachea temperature sensor is used to detect the temperature of the trachea. An indoor fan is used to blow air to the indoor heat exchanger so that the indoor heat exchanger exchanges heat with the blown air; The controller is configured as follows: In response to a high-temperature sterilization command, the air conditioning system is controlled to operate in cooling mode to cause the indoor heat exchanger to freeze. During the operation of the air conditioning system in cooling mode, the indoor fan is controlled to operate based on the air pipe temperature detected by the air pipe temperature sensor. In response to the air conditioning system reaching the icing exit condition, the air conditioning system is controlled to enter the high-temperature sterilization and de-icing stage.

2. The air conditioning system according to claim 1, characterized in that, The step of controlling the operation of the indoor fan based on the trachea temperature detected by the trachea temperature sensor includes: Control the indoor fan to operate at the first operating parameter; After the indoor fan has been running for a first preset period of time, the air pipe temperature is detected based on the air pipe temperature sensor. If the air duct temperature meets a first condition, the indoor fan is controlled to continue operating; the first condition is that the air duct temperature remains below a first preset temperature for a second preset duration. When the air duct temperature meets the second condition, the indoor fan is controlled to stop operating; the second condition is that the air duct temperature is above the second preset temperature for a third preset duration, and the second preset temperature is above the first preset temperature.

3. The air conditioning system according to claim 2, characterized in that, The controller is also configured to: If the air duct temperature does not meet the first and second conditions, the indoor fan is controlled to operate intermittently.

4. The air conditioning system according to claim 1, characterized in that, The icing exit condition includes any one of the following: The air conditioning system operates in cooling mode for a duration that reaches the third preset duration. The duration during which the tracheal temperature remains below the third preset temperature reaches the fourth preset duration; The duration during which the tracheal temperature remains below the fourth preset temperature reaches the fifth preset duration; The third preset temperature is below the fourth preset temperature, and the fourth preset duration is below the fifth preset duration.

5. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes: An indoor liquid pipe is connected at one end to the outdoor heat exchanger and at the other end to the indoor heat exchanger, so that the indoor heat exchanger is also connected to the outdoor heat exchanger through the indoor liquid pipe. A liquid pipe temperature sensor is used to detect the temperature of the indoor liquid pipe; The controller is also configured to: In response to the air conditioning system entering the high-temperature sterilization and de-icing stage, the air conditioning system is controlled to operate in heating mode; During the operation of the air conditioning system in heating mode, the indoor fan is controlled to operate based on the current indoor liquid pipe temperature detected by the liquid pipe temperature sensor until the conditions for high-temperature sterilization and de-icing are met.

6. The air conditioning system according to claim 5, characterized in that, The step of controlling the operation of the indoor fan based on the current indoor liquid pipe temperature detected by the liquid pipe temperature sensor includes: Based on the current indoor liquid pipe temperature and the historical indoor liquid pipe temperature, determine the changes in the indoor liquid pipe temperature; When the temperature of the indoor liquid pipe is rising, the operating parameters of the indoor fan corresponding to the current indoor liquid pipe temperature are determined according to the first correspondence between the indoor liquid pipe temperature and the operating parameters of the indoor fan. In the first correspondence, the indoor liquid pipe temperature is positively correlated with the speed of the indoor fan when it is running at the operating parameters. When the temperature of the indoor liquid pipe decreases, the operating parameters of the indoor fan corresponding to the current indoor liquid pipe temperature are determined according to the second correspondence between the indoor liquid pipe temperature and the operating parameters of the indoor fan. In the second correspondence, the indoor liquid pipe temperature is negatively correlated with the speed of the indoor fan when it is running at the operating parameters.

7. The air conditioning system according to claim 6, characterized in that, The air conditioning system also includes: An ambient temperature sensor is used to detect the outdoor ambient temperature. Return air temperature sensor, used to detect indoor return air temperature; The first correspondence includes: the operating parameters corresponding to each of the multiple first temperature ranges; The second correspondence includes: the operating parameters corresponding to each of the multiple second temperature ranges; The range of the first temperature range and / or the range of the second temperature range are determined based on the outdoor ambient temperature detected by the ambient temperature sensor and the indoor return air temperature detected by the return air temperature sensor.

8. The air conditioning system according to any one of claims 1-7, characterized in that, The control of the air conditioning system to enter the high-temperature sterilization and de-icing stage includes: The air conditioning system is controlled to operate in air supply mode for a preset time, and then the air conditioning system is controlled to enter the high-temperature sterilization and de-icing stage.

9. A control method for an air conditioning system, characterized in that, The method includes: In response to the high-temperature sterilization command, the air conditioning system is controlled to operate in cooling mode to cause the indoor heat exchanger to freeze. During the operation of the air conditioning system in cooling mode, the indoor fan is controlled based on the air pipe temperature detected by the air pipe temperature sensor. In response to the air conditioning system reaching the icing exit condition, the air conditioning system is controlled to enter the high-temperature sterilization and de-icing stage.

10. The control method according to claim 9, characterized in that, The method further includes: In response to the air conditioning system entering the high-temperature sterilization and de-icing stage, the air conditioning system is controlled to operate in heating mode; During the operation of the air conditioning system in heating mode, the indoor fan is controlled to operate based on the current indoor liquid pipe temperature detected by the liquid pipe temperature sensor until the conditions for high-temperature sterilization and de-icing are met.

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