Control method and control device of air conditioner, storage medium and air conditioner

Abstract

The application provides a control method and device of an air conditioner, a storage medium and the air conditioner. The method comprises: obtaining operation parameters of the air conditioner, wherein the operation parameters of the air conditioner comprise: an indoor environment temperature, an indoor environment temperature change rate, an outdoor heat exchanger temperature, an outdoor air dew point temperature and an outdoor relative humidity change rate; determining whether to start a pre-defrosting treatment mode of the air conditioner according to a size relationship between the operation parameters of the air conditioner and corresponding preset values; and increasing an electronic expansion valve opening degree of the air conditioner and / or reducing an indoor fan rotating speed of the air conditioner after the air conditioner continues to operate for a target time length in the heating mode. The method can distribute part of heat to the outdoor heat exchanger in advance under the condition that the indoor temperature is less affected, inhibit the formation of a frost layer of the outdoor heat exchanger, prolong the indoor heating operation time length and avoid the indoor temperature being cold and hot alternately due to frequent frosting and defrosting.

Description

Technical Field

[0001] This application relates to the field of air conditioner control, and more specifically, to an air conditioner control method, an air conditioner control device, a computer-readable storage medium, and an air conditioner. Background Technology

[0002] During the heating operation of an air conditioner, especially in low-temperature and high-humidity environments, frost easily forms on the surface of the outdoor heat exchanger. The formation of frost significantly reduces heat exchange efficiency, leading to a decrease in heating capacity and consequently affecting indoor temperature stability. To address this issue, existing technologies typically employ a reverse-cycle defrosting method: during defrosting, a four-way valve reverses the refrigerant flow, switching the air conditioner from heating to cooling mode. Simultaneously, both indoor and outdoor fans stop rotating, and the high-temperature, high-pressure refrigerant gas discharged from the compressor is sent to the outdoor heat exchanger. The heat from the refrigerant inside the pipes melts the frost, and after defrosting, the air conditioner resumes heating mode. However, this method causes an interruption in indoor heating during defrosting, resulting in indoor temperature fluctuations (a drop of 5°C to 6°C during defrosting), affecting user comfort. Especially in high-humidity areas, frequent frost formation and defrosting of the outdoor unit (averaging once per hour) causes fluctuating indoor temperatures, greatly impacting the heating comfort of the air conditioner. Furthermore, frequent defrosting operations not only increase energy consumption but may also shorten the system's lifespan.

[0003] Current defrosting control strategies are mostly based on fixed time or fixed temperature difference triggering. However, these methods often defrost only after frost has formed, lacking the ability to dynamically respond to changes in environmental parameters. This makes it difficult to effectively delay frost formation while ensuring indoor comfort, resulting in frequent defrosting and large fluctuations in indoor temperature. Summary of the Invention

[0004] The main objective of this application is to provide a control method for an air conditioner, a control device for an air conditioner, a computer-readable storage medium, and an air conditioner, so as to at least solve the problem that existing air conditioner defrosting methods are unable to effectively delay frost formation while ensuring indoor comfort, resulting in frequent defrosting and large fluctuations in indoor temperature.

[0005] To achieve the above objectives, according to one aspect of this application, a control method for an air conditioner is provided, comprising: acquiring operating parameters of the air conditioner, the operating parameters including: indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature, and outdoor relative humidity change rate; determining whether to activate the pre-defrosting mode of the air conditioner based at least on the relationship between the operating parameters of the air conditioner and corresponding preset values; and, if the pre-defrosting mode of the air conditioner is activated, controlling the air conditioner to continue operating in heating mode for a target duration, and then increasing the opening of the electronic expansion valve of the air conditioner and / or decreasing the indoor fan speed of the air conditioner to perform pre-defrosting treatment on the air conditioner.

[0006] Optionally, determining whether to activate the pre-defrost mode of the air conditioner based on the relationship between the operating parameters of the air conditioner and the corresponding preset values ​​includes: a first determination step, determining the difference between the set temperature of the air conditioner and the indoor ambient temperature as a first difference, and executing a second determination step if the first difference is less than or equal to a first preset difference and / or the rate of change of the indoor ambient temperature is continuously less than or equal to a preset rate of change of the indoor ambient temperature within a preset time period; the second determination step, determining to activate the pre-defrost mode of the air conditioner if the outdoor heat exchanger temperature is less than the outdoor air dew point temperature and / or the rate of change of the outdoor relative humidity is greater than or equal to a preset humidity change rate.

[0007] Optionally, before controlling the air conditioner to continue operating in heating mode for the target duration, the method further includes: obtaining the initial timing threshold, dynamic adjustment factor, and outdoor fan power variation coefficient of the air conditioner; determining the target duration as the product of the initial timing threshold, dynamic adjustment factor, and outdoor fan power variation coefficient, wherein the initial timing threshold is negatively correlated with a second difference, the outdoor fan power variation coefficient is the ratio of the outdoor fan power reference value to the outdoor fan power detection value of the air conditioner, and the second difference is the difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature.

[0008] Optionally, obtaining the dynamic adjustment factor includes: obtaining the previous cycle heating operation time, the reference heating operation time, the previous cycle defrosting time, and the maximum allowable defrosting time of the air conditioner, wherein the previous cycle heating operation time is the duration from the end of the (n-2)th defrosting cycle and the resumption of heating to the (n-1)th defrosting cycle, and the previous cycle defrosting time is the duration from the (n-1)th defrosting cycle to the (n-1)th defrosting cycle exit, where n is an integer greater than 2; determining the ratio of the previous cycle heating operation time to the reference heating operation time as a first ratio, determining the ratio of the previous cycle defrosting time to the maximum allowable defrosting time as a second ratio, and determining the difference between 1 and the second ratio as a third difference; and determining the sum of the first ratio and the third difference as the dynamic adjustment factor.

[0009] Optionally, increasing the opening of the electronic expansion valve of the air conditioner and / or decreasing the speed of the indoor fan of the air conditioner includes: obtaining the outdoor air dew point temperature of the air conditioner; determining the difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature to obtain a fourth difference value; determining the opening adjustment value of the electronic expansion valve of the air conditioner and the speed adjustment value of the indoor fan of the air conditioner based on the fourth difference value, wherein the opening adjustment value and the speed adjustment value are both positively correlated with the fourth difference value; increasing the opening of the electronic expansion valve of the air conditioner by the opening adjustment value, and / or decreasing the speed adjustment value of the indoor fan of the air conditioner by the speed adjustment value.

[0010] Optionally, after performing pre-defrosting on the air conditioner, the method further includes: determining the difference between the outdoor heat exchanger temperature and the outdoor air dew point temperature as a fifth difference; determining the difference between the current indoor ambient temperature and the previous indoor ambient temperature as a sixth difference; obtaining the outdoor heat exchanger temperature change rate and the pre-defrosting duration; and determining whether to end defrosting based on the magnitude of the fifth difference, the sixth difference, the outdoor heat exchanger temperature change rate, and the pre-defrosting duration.

[0011] Optionally, determining whether to end defrosting based on the fifth difference, the sixth difference, the outdoor heat exchanger temperature change rate, and the pre-defrosting duration includes: determining to end defrosting if preset conditions are met, wherein the preset conditions include at least one of the following: the fifth difference is greater than or equal to the second preset difference, the sixth difference is greater than or equal to the third preset difference, the sixth difference is less than the fourth preset difference and the outdoor heat exchanger temperature change rate is less than the outdoor ambient temperature preset change rate, and the pre-defrosting duration is greater than or equal to the maximum pre-defrosting duration.

[0012] According to another aspect of this application, a control device for an air conditioner is provided, comprising: an acquisition unit for acquiring operating parameters of the air conditioner, the operating parameters including: indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature, and outdoor relative humidity change rate; a judgment unit for determining whether to activate the pre-defrosting mode of the air conditioner, at least based on the relationship between the operating parameters of the air conditioner and corresponding preset values; and a control unit for, when the pre-defrosting mode of the air conditioner is activated, controlling the air conditioner to continue operating in heating mode for a target duration, and then increasing the opening of the electronic expansion valve and / or decreasing the indoor fan speed of the air conditioner to perform pre-defrosting treatment on the air conditioner.

[0013] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform any of the control methods of the air conditioner described above.

[0014] According to another aspect of this application, an air conditioner is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a control method for performing any of the air conditioners described above.

[0015] Applying the technical solution of this application, the control method for the aforementioned air conditioner first obtains the operating parameters of the air conditioner, including: indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature, and outdoor relative humidity change rate. Based at least on the relationship between the air conditioner's operating parameters and their corresponding preset values, it is determined whether to activate the air conditioner's pre-defrost processing mode. If the pre-defrost processing mode is activated, after controlling the air conditioner to continue operating in heating mode for a target duration, the opening of the air conditioner's electronic expansion valve is increased and / or the indoor fan speed is decreased to perform pre-defrost processing. This method can pre-allocate some heat to the outdoor heat exchanger with minimal impact on indoor temperature, suppressing frost formation on the outdoor heat exchanger, extending the indoor heating operation time, and avoiding frequent frost formation and defrosting that causes sudden temperature fluctuations indoors. It solves the problem that existing air conditioner defrosting methods struggle to effectively delay frost formation while ensuring indoor comfort, leading to frequent defrosting and large indoor temperature fluctuations. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 A hardware structure block diagram of a mobile terminal for performing a control method for an air conditioner according to an embodiment of this application is shown;

[0018] Figure 2 A schematic flowchart of a control method for an air conditioner according to an embodiment of this application is shown;

[0019] Figure 3 A schematic flowchart of another air conditioner control method provided according to an embodiment of this application is shown;

[0020] Figure 4 A schematic diagram of an indoor ambient temperature change curve of an air conditioner according to an embodiment of this application is shown;

[0021] Figure 5 This diagram illustrates the indoor ambient temperature variation curve of an air conditioner in the prior art.

[0022] Figure 6 A structural block diagram of a control device for an air conditioner provided according to an embodiment of this application is shown.

[0023] The above figures include the following reference numerals:

[0024] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] As described in the background section, existing technologies typically employ a reverse-cycle defrosting method: during defrosting, a four-way valve reverses the refrigerant flow, switching the air conditioner from heating to cooling mode. Simultaneously, both indoor and outdoor fans stop running, and the high-temperature, high-pressure refrigerant gas discharged from the compressor is sent to the outdoor heat exchanger. The heat from the refrigerant inside the pipes melts the frost layer, and after defrosting, the air conditioner resumes heating mode. However, this method causes an interruption in indoor heating during defrosting, resulting in indoor temperature fluctuations (a drop of 5°C to 6°C during defrosting), affecting user comfort. Especially in high-humidity areas, frequent defrosting of the outdoor unit (averaging once per hour) causes fluctuating indoor temperatures, significantly impacting the air conditioner's heating comfort. Furthermore, frequent defrosting operations not only increase energy consumption but may also shorten the system's lifespan.

[0029] To address the problem that existing air conditioner defrosting methods are unable to effectively delay frost formation while ensuring indoor comfort, leading to frequent defrosting and large fluctuations in indoor temperature, embodiments of this application provide an air conditioner control method, an air conditioner control device, a computer-readable storage medium, and an air conditioner.

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for an air conditioner control method according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0032] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the air conditioner control method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0033] This embodiment provides a control method for an air conditioner that runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0034] Figure 2 This is a flowchart of an air conditioner control method according to an embodiment of this application. Figure 2 As shown, the method includes the following steps:

[0035] Step S201: Obtain the operating parameters of the air conditioner, including: indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature and outdoor relative humidity change rate.

[0036] The indoor ambient temperature (T_inner_loop) refers to the actual temperature inside the space where the air conditioner is located. The system needs to monitor this parameter in real time because it directly affects the air conditioner's efficiency and user comfort. In heating mode, the stability of the indoor ambient temperature and its proximity to the set temperature are crucial factors in determining whether to activate pre-defrost control. The indoor ambient temperature change rate (γ) refers to the rate at which the indoor ambient temperature changes over time, usually expressed as the temperature change in degrees Celsius per minute. By monitoring the indoor temperature change rate, the system can determine whether the indoor temperature is stabilizing. If the indoor temperature change rate decreases to a certain level, it means that the user's demand for indoor heat input is weakening, at which point pre-defrost can be considered without significantly impacting indoor comfort. The outdoor heat exchanger temperature (T_outer_pipe) is the surface temperature of the outdoor heat exchanger in the air conditioning system. Since the outdoor heat exchanger is directly exposed to the environment, its temperature is affected by external weather conditions. Especially under low temperature and high humidity conditions, when the outdoor heat exchanger temperature is below the air dew point temperature, frost is easily formed, affecting heat exchange efficiency. Therefore, monitoring the outdoor heat exchanger temperature helps the system predict frost formation trends. Outdoor air dew point temperature (T-dew point) is the temperature at which water vapor in the air begins to condense into dew, reflecting the air's humidity level. In high-humidity environments, the dew point temperature is higher, making outdoor heat exchangers more prone to frosting. Therefore, by comparing the outdoor heat exchanger temperature with the dew point temperature, the system can determine whether there is a risk of frosting. The outdoor relative humidity change rate (α) refers to the rate at which outdoor relative humidity changes over time. A sudden increase in humidity may accelerate frost formation, so monitoring the outdoor relative humidity change rate helps the system predict the likelihood of frosting in advance and take timely measures to prevent or delay frost accumulation.

[0037] Step S202: Determine whether to activate the pre-defrosting mode of the air conditioner based at least on the relationship between the operating parameters of the air conditioner and the corresponding preset values.

[0038] As mentioned above, the operating parameters of an air conditioner include indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature, and outdoor relative humidity change rate. These parameters reflect the current operating status of the air conditioner and the conditions of the environment. The corresponding preset values ​​refer to the threshold or standard values ​​set for each operating parameter. The preset values ​​are set based on considerations of the air conditioner's performance, user comfort requirements, and environmental conditions. For example, if the indoor ambient temperature change rate is lower than the preset value γ, it indicates that the indoor temperature is stabilizing; if the outdoor heat exchanger temperature is lower than the preset difference of the outdoor air dew point temperature, it indicates that there is a risk of frost formation. The control system compares the real-time acquired operating parameter values ​​with the corresponding preset values ​​and determines whether to activate the pre-defrost processing mode based on the comparison results. Activation is usually based on operating parameters indicating a risk of frost formation or when the indoor ambient temperature stabilizes to a certain level. For example, if the difference between the indoor ambient temperature and the set temperature is close to or less than the preset difference ΔT1, it means that the indoor temperature is close to the user-set temperature, which is a condition for activating pre-defrost. If the outdoor heat exchanger temperature is lower than a certain outdoor air dew point temperature, or the outdoor relative humidity rises at a rate exceeding the preset value α, it indicates a clear tendency to frost, and pre-defrosting needs to be initiated to prevent frost formation.

[0039] In heating operation, pre-defrosting mode is a special operating state. Its goal is to prevent frost accumulation or reduce frost thickness by adjusting system parameters (such as the opening of the electronic expansion valve and the speed of the indoor fan) before or in the early stages of frost formation. This mode aims to extend the heating cycle, reduce the frequency of formal defrosting, thereby improving energy efficiency and maintaining stable and comfortable indoor temperatures.

[0040] Step S203: When the pre-defrosting mode of the air conditioner is activated, after controlling the air conditioner to continue running in heating mode for a target duration, the opening of the electronic expansion valve of the air conditioner is increased and / or the indoor fan speed of the air conditioner is decreased to perform pre-defrosting on the air conditioner.

[0041] When the air conditioner's operating parameters reach the startup conditions compared to preset values, the air conditioner control system switches to pre-defrost mode. The goal of this mode is to delay or reduce frost accumulation by gently redistributing heat before frost forms or when the frost layer is thin, thereby reducing the need for formal defrosting and maintaining system efficiency and user comfort. Before formally entering pre-defrost mode, the air conditioner will operate in heating mode for a period of time, called the target duration or pre-defrost heating operation time τ. This target duration is dynamically adjusted based on the initial timing threshold τ, the dynamic adjustment factor k, and the outdoor fan power variation coefficient f. The target duration τ is set to ensure that sufficient heat is provided to the room before the frost layer severely affects heat exchange efficiency, while preparing for subsequent pre-defrost processing. During pre-defrost, the air conditioner adjusts the refrigerant flow by increasing the opening degree (ΔB) of the electronic expansion valve, directing more refrigerant to the outdoor heat exchanger. The electronic expansion valve is a key component in air conditioning systems that regulates refrigerant flow. By increasing its opening, it increases the amount of refrigerant flowing through the outdoor heat exchanger, thereby increasing the heat exchanger's capacity and helping to melt or inhibit frost formation. Simultaneously, the air conditioner reduces the indoor fan speed (ΔR) to minimize heat loss from the indoor environment and ensure more heat is redistributed to the outdoor heat exchanger. This reduced indoor fan speed decreases heat exchange between the indoor and outdoor environments, allowing more heat to remain in the system for pre-defrosting.

[0042] Through the above steps, the air conditioner, without completely interrupting indoor heating, dynamically adjusts the opening of the electronic expansion valve and the indoor fan speed to redistribute some heat from the indoor unit to the outdoor heat exchanger, thereby suppressing or reducing frost formation. This method can improve the air conditioner's operating efficiency, reduce energy consumption, extend heating operation time, and avoid indoor temperature fluctuations and system burden caused by frequent defrosting, while minimizing impact on indoor temperature comfort.

[0043] It is worth noting that the increase in the opening of the electronic expansion valve and the decrease in the speed of the indoor fan are both within the range allowed by the system and will not exceed the maximum opening of the electronic expansion valve Bmax or the minimum allowable speed of the indoor fan Rmin, so as to ensure the safe and stable operation of the system.

[0044] The air conditioner control method described in this application first obtains the air conditioner's operating parameters, including: indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature, and outdoor relative humidity change rate. Based on the relationship between the air conditioner's operating parameters and their corresponding preset values, it is determined whether to activate the air conditioner's pre-defrost mode. If the pre-defrost mode is activated, after controlling the air conditioner to continue operating in heating mode for a target duration, the opening of the air conditioner's electronic expansion valve is increased and / or the indoor fan speed is decreased to perform pre-defrost processing. This method can pre-allocate some heat to the outdoor heat exchanger with minimal impact on indoor temperature, suppressing frost formation on the outdoor heat exchanger, extending the indoor heating operation time, and avoiding frequent frost formation and defrosting that causes sudden temperature fluctuations indoors. It solves the problem that existing air conditioner defrosting methods struggle to effectively delay frost formation while ensuring indoor comfort, leading to frequent defrosting and large indoor temperature fluctuations.

[0045] The air conditioner heating operation control method in the above embodiments can achieve pre-defrost control during heating operation to reduce defrost frequency, improve system operating efficiency, and enhance user comfort. It determines whether to initiate pre-defrost based on the difference between indoor temperature and set temperature, and the rate of change of indoor temperature; it determines the frosting trend based on the difference between outdoor heat exchanger temperature and dew point temperature, and the rate of change of relative humidity; and it uses an initial timing threshold τ... 初始 The pre-defrost heating operation timing τ, composed of a dynamic adjustment factor k and an outdoor fan power variation coefficient f, dynamically adjusts the timing of pre-defrost entry. During the pre-defrost stage, the opening of the electronic expansion valve and the indoor fan speed are dynamically adjusted to achieve reasonable heat distribution. A multi-condition judgment mechanism enables intelligent exit of the pre-defrost control mode, restoring normal heating operation. Through the pre-defrost method, some heat is pre-allocated to the outdoor heat exchanger with minimal impact on indoor temperature, inhibiting frost formation on the outdoor heat exchanger, extending the indoor heating operation time, and avoiding frequent frost and defrost that cause sudden changes in indoor temperature.

[0046] In some embodiments, determining whether to activate the pre-defrost mode of the air conditioner based on the relationship between the operating parameters of the air conditioner and the corresponding preset values ​​includes the following steps:

[0047] The first determining step involves determining the difference between the set temperature of the air conditioner and the indoor ambient temperature as a first difference, and executing the second determining step if the first difference is less than or equal to a first preset difference and / or if the rate of change of the indoor ambient temperature is continuously less than or equal to the preset rate of change of the indoor ambient temperature within a preset time period.

[0048] The second determining step above involves determining to activate the pre-defrost processing mode of the air conditioner when the outdoor heat exchanger temperature is lower than the outdoor air dew point temperature and / or the outdoor relative humidity change rate is greater than or equal to the preset humidity change rate.

[0049] For the first determining step, the set temperature T of the air conditioner 设定 The user sets the temperature for the air conditioner, in °C; indoor ambient temperature (T). 内环 The unit is °C. The preset duration is generally 1.5 min to 3 min, preferably 2 min. When the air conditioner is running in heating mode, T is detected. 设定 T 内环 When T is satisfied 设定 -T 内环 ≤ΔT1 (first preset difference) or continuously for 2 minutes satisfying the indoor ambient temperature change rate γ ≤ indoor ambient temperature preset change rate γ 预设 If the current state remains unchanged, proceed to the next step of the judgment.

[0050] Wherein, the first preset difference ΔT1 is the preset difference between the user-set temperature and the indoor ambient temperature, in °C, and its value range includes but is not limited to -3~3℃, one possible value is ΔT1=0.5℃; the indoor ambient temperature change rate γ is in °C / min, γ=(T 内环i -T 内环i-1 ) / (1min), T 内环i The current indoor ambient temperature, in °C, is the measured value; T 内环i-1 The indoor ambient temperature for the previous minute is shown in °C. This value is the measured value. The preset rate of change of indoor ambient temperature is γ. 预设 This is a preset value for the rate of change of indoor ambient temperature, in °C / min. Its range includes, but is not limited to, 0~2 °C / min, and one possible value is γ. 预设 =0.3℃ / min.

[0051] Satisfy T 设定 -T 内环 ≤ΔT1 indicates that the indoor ambient temperature is close to the user's set temperature, and γ≤γ is satisfied for 2 consecutive minutes. 预设 This indicates that the rate of change of indoor ambient temperature has been lower than the preset value for 2 consecutive minutes, meaning that the rate of increase in indoor temperature has slowed down. Both of these situations indicate that the current indoor heating temperature is stabilizing and further judgment can be made.

[0052] For the second determining step, the outdoor air dew point temperature T is measured. 露点 Outdoor heat exchanger temperature T 外管 Outdoor relative humidity (RH) 外环 When T is satisfied 外管 <T 露点Or, satisfy the outdoor relative humidity change rate α ≥ preset humidity change rate α 预设 Start the pre-defrost heating operation timer; otherwise, maintain the current operating status.

[0053] Where, α=(RH) 外环i -RH 外环i-1 ) / (1min), RH 外环i The current outdoor relative humidity, in %, is the measured value; RH 外环i-1 The outdoor relative humidity is % for the previous minute; this is the measured value. α is the rate of change of outdoor relative humidity, in % / min. 预设 This is a preset value for the rate of change of relative humidity in the outdoor environment, in % / min. Its value range includes, but is not limited to, 0~15% / min, and one possible value is α. 预设 =3% / min.

[0054] Among them, satisfying T 外管 <T 露点 This indicates that the outdoor heat exchanger temperature has fallen below the outdoor air dew point temperature, and frost has begun to form on the outdoor heat exchanger, satisfying α≥α 预设 This indicates that the outdoor relative humidity is rising. The higher the relative humidity, the higher the risk of frost formation, and there is a need for pre-defrosting.

[0055] In this embodiment, the control strategy for the air conditioner's heating operation is further refined to more accurately determine when to activate the pre-defrost mode. Specifically, a first determination step is performed, in which the difference between the set temperature and the indoor ambient temperature is analyzed as a first difference. If the first difference is less than or equal to a first preset difference, or if the rate of change of the indoor ambient temperature is consistently less than or equal to a preset rate of change of the indoor ambient temperature within a preset time period, this means that the indoor temperature is close to the set value and the temperature change is stable, indicating that the indoor demand for additional heat is reduced, thus reserving space for outdoor pre-defrost operation. Subsequently, a second determination step is performed, which comprehensively considers the comparison between the outdoor heat exchanger temperature and the outdoor air dew point temperature, as well as the rate of change of outdoor relative humidity. If the outdoor heat exchanger temperature is lower than the outdoor air dew point temperature, or the rate of change of outdoor relative humidity is greater than or equal to a preset rate of change of humidity, this indicates that there is a risk of frost formation in the outdoor environment. The system then determines to activate the pre-defrost mode, pre-allocating heat to the outdoor heat exchanger to suppress frost formation. This control strategy achieves intelligent judgment of pre-defrosting timing by dynamically monitoring the stability of indoor temperature and the potential risk of outdoor frost formation. It effectively balances indoor comfort with frost control on the outdoor heat exchanger, delays defrosting frequency, reduces indoor temperature fluctuations, and improves overall system efficiency. In other embodiments, the judgment conditions of the first determination step and the trigger threshold of the second determination step can be adjusted according to different environmental conditions and air conditioner characteristics to adapt to a wider range of application scenarios and further optimize the pre-defrosting effect. Over time, through the system's built-in learning algorithm, the dynamic adjustment factor k and the outdoor fan power change coefficient f can self-optimize based on historical operating data, improving the adaptability and accuracy of the pre-defrosting strategy. In the pre-defrosting exit mechanism, by detecting the temperature rise of the outdoor heat exchanger and the magnitude of indoor temperature changes, the timing of pre-defrosting completion is intelligently determined, and heating operation is promptly restored, avoiding the impact of prolonged pre-defrosting on indoor temperature and ensuring user comfort. This series of dynamic adjustments and intelligent judgment mechanisms constitutes the core of the pre-defrosting control mode, significantly improving the operational stability and efficiency of the air conditioner in low-temperature and high-humidity environments.

[0056] In some embodiments, before controlling the air conditioner to continue operating in heating mode for the target duration, the method further includes the following steps:

[0057] Step S301: Obtain the initial timing threshold, dynamic adjustment factor, and outdoor fan power variation coefficient of the air conditioner.

[0058] Step S302: The product of the initial timing threshold, dynamic adjustment factor and outdoor fan power change coefficient of the air conditioner is determined as the target duration. The initial timing threshold is negatively correlated with the second difference. The outdoor fan power change coefficient is the ratio of the outdoor fan power reference value and the outdoor fan power detection value of the air conditioner. The second difference is the difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature.

[0059] Before activating the pre-defrost mode of the air conditioner, the air conditioner needs to continue heating operation until the pre-defrost heating operation time τ (i.e., the target time) is reached, where τ = τ 初始 ×k×f,τ 初始 The initial timing threshold for the air conditioner is given in seconds (s), k is the dynamic adjustment factor, and f is the outdoor fan power variation coefficient. When the heat exchanger just begins to frost and the frost layer does not completely cover the heat exchanger surface, the increased heat exchange area is beneficial to improving heating capacity. Therefore, pre-defrosting is not required in the initial stage of frost formation; pre-defrosting should begin after running for τ hours.

[0060] Initial timing threshold τ 初始 The timing is determined by the difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature. A larger difference (i.e., a lower heat exchanger temperature) indicates faster frosting, thus requiring a shorter timing period; a smaller difference (i.e., a higher heat exchanger temperature) indicates slower frosting, thus allowing for a longer timing period. One example of such a value is shown in Table 1.

[0061] Table 1

[0062]

[0063] The outdoor fan power variation coefficient f increases with the amount of frost on the outdoor heat exchanger surface. This increases the outdoor unit's air resistance, affecting the outdoor fan's power. While maintaining a constant fan speed, the fan power increases with increasing air resistance. Therefore, changes in fan power can reflect the frost condition. f=P 基准 When the amount of frost is small, the fan resistance is low, and the fan power is close to the reference value, P≈P 基准 When f approaches 1, the wind resistance increases and the power increases when there is a lot of frost, so P > P0. 基准 If f < 1, pre-defrosting needs to be started earlier, and the timing should be shortened. To prevent f from being too large or too small, an upper / lower limit is set for f. The maximum value of f is 1.2, and the minimum value is 0.8.

[0064] Where P is the outdoor fan power value, in W, and this value is the measured value; P 基准This is a reference value for the outdoor fan power at a certain speed, in W. Its value is related to the motor itself and the resistance of the outdoor heat exchanger, and can be determined based on experimental data. One possible value is shown in Table 2.

[0065] Table 2

[0066]

[0067] In this embodiment, the air conditioner control method introduces a dynamic pre-defrosting strategy to optimize frost management during heating operation. Specifically, by comprehensively evaluating the difference between the indoor temperature and the set temperature, the rate of change of the indoor temperature, the difference between the outdoor heat exchanger temperature and the dew point temperature, and the trend of outdoor relative humidity, the system can intelligently determine whether to activate the pre-defrosting control mode. Based on this, this embodiment further proposes a dynamic adjustment mechanism for the heating operation timing before pre-defrosting. The key to this mechanism lies in the interaction of the initial timing threshold τinitial, the dynamic adjustment factor k, and the outdoor fan power variation coefficient f. τinitial is negatively correlated with the difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature. This means that when the risk of frost is high, the system will intervene in the pre-defrosting procedure earlier, and vice versa, to achieve optimal operating efficiency. The dynamic adjustment factor k is adjusted according to the ratio of the heating operation time to the defrosting time of the previous cycle, while the outdoor fan power variation coefficient f reflects the ratio of the outdoor fan power reference value to the real-time power value, used to reflect the impact of the degree of frost on the fan load. By multiplying these three factors to obtain the target duration τ, the air conditioner can precisely control the timing of the transition between heating operation and pre-defrosting, thereby achieving rational utilization of heat, reducing the frequency of defrosting, and maintaining indoor comfort without significant impact.

[0068] Obtaining the aforementioned dynamic adjustment factor includes the following steps:

[0069] Step S3011: Obtain the previous cycle heating operation time, the reference heating operation time, the previous cycle defrosting time, and the maximum allowable defrosting time of the air conditioner. The previous cycle heating operation time is the time from the end of the (n-2)th defrosting cycle to the start of the (n-1)th defrosting cycle. The previous cycle defrosting time is the time from the start of the (n-1)th defrosting cycle to the end of the (n-1)th defrosting cycle. Here, n is an integer greater than 2.

[0070] Step S3012: The ratio of the heating operation time of the previous cycle to the reference heating operation time is determined as the first ratio, the ratio of the defrosting time of the previous cycle to the maximum allowable defrosting time is determined as the second ratio, and the difference between 1 and the second ratio is determined as the third difference.

[0071] Step S3013: The sum of the first ratio and the third difference is determined as the dynamic adjustment factor.

[0072] Among them, the dynamic adjustment factor k is related to the heating operation time and defrosting time of the previous cycle. When the heating operation time of the previous cycle is longer and the defrosting time is shorter, it indicates that the frost formation is slow, defrosting is only done once every long period of time, the amount of frost is small, and defrosting is fast. Therefore, the timing can be extended and the dynamic adjustment factor k is larger. When the heating operation time of the previous cycle is shorter and the defrosting time is longer, it indicates that the frost formation is faster, defrosting is more frequent, the amount of frost is larger, and defrosting is slower. Therefore, the timing needs to be shortened and the dynamic adjustment factor k is smaller. The first ratio reflects the impact of the previous heating cycle's operating time on the timing. A ratio greater than 1 indicates slow frosting and requires a longer timing period, while a ratio less than 1 indicates rapid frosting and requires a shorter timing period. This ratio allows the system to dynamically adjust the timing based on the length of the "heating cycle." The second ratio reflects the impact of the previous defrosting time on the timing. A smaller ratio indicates rapid defrosting and requires a longer timing period, while a larger ratio indicates slow defrosting and requires a shorter timing period. The second ratio has a maximum value of 1. This ratio allows the system to dynamically adjust the timing based on the length of the "defrosting time." To prevent k from becoming too large or too small, upper and lower limits are set for k. The previous cycle's defrosting duration t... 除霜 The units are s and t. 除霜 The maximum is the maximum allowable defrosting time t. 除霜max Defrosting time reaches t 除霜max Automatic defrosting exit, unit: seconds, its value range includes but is not limited to 180~1200 seconds, one of which can be t. 除霜max =720s.

[0073] Among them, t 制热 This refers to the heating operation duration of the previous cycle, in seconds (s). It represents the time from the end of the previous defrost cycle when heating resumed to the start of the previous defrost cycle; this value is the measured value. 基准 The baseline heating operating time is expressed in seconds (s), and its value is related to the outdoor ambient relative humidity (RH). 外环 The value is related and determined based on experimental data. One example of such a value is shown in Table 3:

[0074] Table 3

[0075]

[0076] In this embodiment, the method for obtaining the dynamic adjustment factor k is based on a comprehensive consideration of the previous cycle heating operation time theating, the reference heating operation time treference, the previous cycle defrosting time tdefrost, and the maximum allowable defrosting time tdefrostmax. First, the ratio of the previous cycle heating operation time to the reference heating operation time is calculated as the first ratio, which reflects the efficiency of heating operation and the trend of frost formation under the current environmental conditions. Next, the ratio of the previous cycle defrosting time to the maximum allowable defrosting time is calculated as the second ratio to assess the efficiency of the defrosting process and the severity of frost formation. Then, the difference between 1 and the second ratio is determined as the third difference, which reflects the negative impact of defrosting time on the dynamic adjustment factor, avoiding frequent pre-defrosting control due to excessively long defrosting time. Finally, the first ratio and the third difference are added together, and the sum is the dynamic adjustment factor k. Using the above method, the dynamic adjustment factor k can automatically adapt to historical operating data and environmental conditions of the air conditioner, flexibly adjusting the pre-defrost heating operation time τ. This effectively suppresses frost formation on the outdoor heat exchanger, extends the heating operation cycle, reduces defrosting frequency, and improves system operating efficiency and user experience while ensuring indoor comfort. In other embodiments, the calculation of the dynamic adjustment factor k can also consider more environmental parameters and operating states, such as indoor temperature change trends and outdoor temperature change rates, to further optimize the pre-defrost control strategy and achieve more precise heat distribution and frost management. Similarly, the outdoor fan power variation coefficient f can be adjusted according to different outdoor environmental conditions and fan power baseline values ​​to adapt to a wider range of operating scenarios.

[0077] Increasing the opening of the electronic expansion valve of the air conditioner and / or decreasing the indoor fan speed of the air conditioner includes the following steps:

[0078] Step S2031: Obtain the outdoor air dew point temperature of the air conditioner.

[0079] Step S2032: Determine the difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature to obtain the fourth difference.

[0080] Step S2033: Based on the above fourth difference, determine the opening adjustment value of the electronic expansion valve of the air conditioner and the speed adjustment value of the indoor fan of the air conditioner, wherein the opening adjustment value and the speed adjustment value are both positively correlated with the above fourth difference.

[0081] Step S2034: Increase the opening value of the electronic expansion valve of the air conditioner by the opening adjustment value, and / or decrease the speed of the indoor fan of the air conditioner by the speed adjustment value.

[0082] During the pre-defrosting phase, the system dynamically adjusts the opening of the electronic expansion valve and the indoor fan speed to direct some heat to the outdoor heat exchanger for pre-defrosting. The increase in the electronic expansion valve opening ΔB (i.e., the opening adjustment value) is related to T. 外管 and T 露点 The difference is related: the larger the difference (i.e., T) 外管 Much lower than T 露点 The higher the risk of frosting, the greater the need to increase ΔB to increase refrigerant flow to the outdoor heat exchanger, thereby improving the pre-defrosting effect; conversely, the smaller the difference, the smaller ΔB, avoiding excessive heat distribution that could affect indoor heating. Simultaneously, the decrease in indoor fan speed ΔR (i.e., the speed adjustment value) and T... 外管 and T 露点 The relationship between the differences is as follows: the larger the difference, the higher the risk of frost, and the larger ΔR (increase the fan speed reduction) to reduce heat loss indoors; the smaller the difference, the smaller ΔR (reduce the fan speed reduction) to distribute more heat indoors.

[0083] B represents the current opening degree of the electronic expansion valve, in units of p (pi). This value is the detected value. ΔB represents the adjustment value of the electronic expansion valve opening, also in units of p. After the electronic expansion valve opening increases, it will not exceed the maximum allowable opening degree B of the valve body. max ΔB is determined based on experimental data, and one example of its value is shown in Table 4:

[0084] Table 4

[0085]

[0086] R represents the current internal fan speed in rpm, and this value is the detected value; ΔR represents the internal fan speed adjustment value in rpm. After the internal fan speed R decreases, it must not exceed the minimum allowable speed R of the fan. min ΔR is determined based on experimental data, and one example of its value is shown in Table 5:

[0087] Table 5

[0088]

[0089] In this embodiment, after activating the pre-defrost control mode, the air conditioner dynamically adjusts the opening of the electronic expansion valve and the speed of the indoor fan based on the difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature, i.e., the fourth difference. Specifically, both the opening adjustment value and the speed adjustment value are positively correlated with the fourth difference. This means that when the outdoor heat exchanger temperature is much lower than the dew point temperature, indicating a higher risk of frosting, the system will correspondingly increase the opening of the electronic expansion valve and simultaneously decrease the indoor fan speed to promote more heat flow to the outdoor heat exchanger and inhibit frost formation. Conversely, when the outdoor heat exchanger temperature is close to the dew point temperature, indicating a slower frosting trend, the opening and speed adjustment values ​​will be correspondingly reduced to avoid excessive consumption of indoor heat and affecting the indoor heating effect. Through this mechanism, the air conditioner can effectively control the frosting of the outdoor heat exchanger while ensuring indoor comfort, extending the heating operation cycle, and reducing the frequency of defrosting operations, thereby achieving energy saving and improving the user experience. In other embodiments, the opening degree of the electronic expansion valve and the speed adjustment of the indoor fan can be further optimized according to the power variation coefficient of the outdoor fan to more accurately match the pre-defrosting requirements, while taking into account the balance between system energy consumption and operating efficiency.

[0090] After performing pre-defrosting on the air conditioner, the method further includes the following steps:

[0091] Step S401: The difference between the outdoor heat exchanger temperature and the outdoor air dew point temperature is determined as the fifth difference.

[0092] Step S402: Determine the difference between the current indoor ambient temperature and the previous indoor ambient temperature as the sixth difference.

[0093] Step S403: Obtain the outdoor heat exchanger temperature change rate and pre-defrost duration of the above-mentioned air conditioner;

[0094] Step S404: Determine whether to end defrosting based on the fifth difference, the sixth difference, the outdoor heat exchanger temperature change rate, and the pre-defrosting duration.

[0095] In this embodiment, after the air conditioner completes pre-defrosting, a strategy for intelligent management of the defrosting process is further introduced. This involves monitoring the difference between the outdoor heat exchanger temperature and the outdoor air dew point temperature (defined as the fifth difference), and the difference between the current and previous indoor ambient temperatures (defined as the sixth difference). Combining this with data analysis of the outdoor heat exchanger temperature change rate and defrosting duration, the criteria for determining the end of defrosting are dynamically adjusted. The core of this control logic lies in the real-time evaluation of the fifth and sixth differences, combined with the specific values ​​of the outdoor heat exchanger temperature change rate and defrosting duration, to comprehensively determine whether defrosting has achieved the expected effect—that is, whether the frost layer on the outdoor heat exchanger has been effectively removed, and whether the indoor temperature has stabilized within a comfortable range. This intelligent defrosting end determination mechanism ensures efficient air conditioner operation while avoiding unnecessary energy waste, ensuring that indoor comfort is not affected by the defrosting process, thereby achieving better energy utilization and user experience. In other embodiments not mentioned, this strategy can also optimize the defrosting process by adjusting algorithm parameters or introducing additional environmental variables, improving the overall operating efficiency and reliability of the system.

[0096] The determination of whether to end defrosting based on the fifth difference, the sixth difference, the outdoor heat exchanger temperature change rate, and the defrosting duration includes: determining to end defrosting when preset conditions are met, wherein the preset conditions include at least one of the following: the fifth difference is greater than or equal to the second preset difference, the sixth difference is greater than or equal to the third preset difference, the sixth difference is less than the fourth preset difference and the outdoor heat exchanger temperature change rate is less than the outdoor ambient temperature preset change rate, and the pre-defrosting duration is greater than or equal to the maximum pre-defrosting duration.

[0097] Detect outdoor air dew point temperature T 露点 Outdoor heat exchanger temperature T 外管 Indoor ambient temperature T 内环 Satisfying T 外管 -T 露点 ≥ the second preset difference ΔT2 or satisfy T 内环2- T 内环1 ≥ Third preset difference ΔT3 or satisfy T 内环2- T 内环1 < Fourth preset difference ΔT4 and outdoor heat exchanger temperature change rate β < outdoor ambient temperature preset change rate β 预设 Or, satisfying the condition that the defrosting time σ ≥ the maximum pre-defrosting time σ max Exit the pre-defrost control mode and restore the normal heating operation mode; otherwise, maintain the current pre-defrost state.

[0098] ΔT2 is the preset difference between the outdoor heat exchanger temperature and the outdoor air dew point temperature, in °C. Its range includes, but is not limited to, 0~10 °C, with one possible value being ΔT2=1.5 °C. ΔT3 is the preset value for discomfort due to excessive indoor temperature drop during pre-defrosting, in °C. Its range includes, but is not limited to, 0~10 °C, with one possible value being ΔT3=4 °C. ΔT4 is the preset value for comfort due to a smaller indoor temperature drop during pre-defrosting, in °C. Its range includes, but is not limited to, 0~10 °C, with one possible value being ΔT4=2 °C. β is the outdoor heat exchanger temperature change rate, in °C / min, β= (T 外管i -T 外管i-1 / (1min); β 预设 This is the preset equilibrium value for the temperature change rate of the outdoor heat exchanger, in °C / min. Its value range includes, but is not limited to, 0~3 °C / min, and one possible value is β. 预设 =0.5℃ / min; T 外管i This is the current outdoor heat exchanger temperature, in °C (°C). This value is the measured value; T 外管i-1 The outdoor heat exchanger temperature in the previous minute is expressed in °C; this value is the measured value. σ represents the duration of the pre-defrosting process in seconds; this value is the measured value. max The maximum pre-defrost time, in seconds, ranges from 60 to 1800 seconds, with one possible value being σ. max =600s;

[0099] The conditions for exiting pre-defrosting include the following four situations: when the indoor ambient temperature drops below the preset temperature, or when the upward trend of the outdoor heat exchanger temperature slows down and the indoor temperature fluctuation is less than the set value, the original heating operation mode is restored.

[0100] (1) Frosting inhibition complete: when T is satisfied 外管 -T 露点 ≥ΔT2 indicates that the outdoor heat exchanger temperature has risen to above the dew point temperature plus the preset temperature difference, indicating that the pre-defrosting has effectively blocked the formation of frost and can restore normal heating.

[0101] (2) Indoor temperature fluctuation control: When T is satisfied 内环2- T 内环1 ≥ΔT3 indicates that the drop in indoor ambient temperature during pre-defrosting exceeds the preset threshold, indicating that pre-defrosting has a significant impact on indoor temperature and should be stopped in advance to avoid user discomfort.

[0102] (3) Pre-defrosting has reached equilibrium: when T is satisfied 内环2- T 内环1 <ΔT4 and β < β 预设This indicates that although the indoor ambient temperature has dropped slightly, the outdoor heat exchanger temperature has changed slowly. Continuing to introduce heat will not have a significant impact on the outdoor heat exchanger. The indoor temperature is stable and the outdoor heat exchanger temperature is stable. Pre-defrosting has reached equilibrium and can be resumed for normal heating operation.

[0103] (4) The maximum pre-defrosting time is reached when σ≥σ max The monitoring indicated that the maximum pre-defrosting time had been reached. To avoid prolonged indoor heating shortages, regular heating operation was resumed.

[0104] In this embodiment, an intelligent defrosting termination determination mechanism is further proposed for the defrosting control method of the air conditioner. Specifically, the system comprehensively considers the fifth difference between the outdoor heat exchanger temperature and the outdoor air dew point temperature, the sixth difference between the outdoor heat exchanger temperature and the preset temperature, the outdoor heat exchanger temperature change rate, and the current defrosting duration to determine whether the defrosting process has reached the termination condition. Once the fifth difference between the outdoor heat exchanger temperature and the dew point temperature reaches or exceeds the second preset difference, or the sixth difference between the outdoor heat exchanger temperature and the preset temperature reaches or exceeds the third preset difference, the system will automatically terminate defrosting and resume heating mode. This helps to provide indoor heating immediately after the frost layer is completely removed, avoiding energy waste. In addition, if the sixth difference is less than the fourth preset difference, and at the same time the outdoor heat exchanger temperature change rate is lower than the preset change rate of the outdoor ambient temperature, it indicates that defrosting has reached a stable state and no additional energy is needed, and defrosting will also end. This reflects the refined management of the defrosting process and ensures the effective use of energy. Finally, even if none of the above conditions are met, the system will forcibly end defrosting when the defrosting time reaches the preset minimum defrosting time to prevent excessive energy consumption due to over-defrosting. This defrosting exit strategy based on multi-parameter monitoring can more accurately determine the completion status of defrosting, effectively avoiding problems of insufficient or excessive defrosting, thereby improving the energy efficiency and reliability of the system while ensuring the efficient operation of the air conditioner. Of course, this invention is not limited to this specific parameter setting and judgment logic, and can be flexibly adjusted according to different air conditioner models, usage environments, and user needs. For example, in the preset conditions, the fifth difference, the sixth difference, and their preset differences can be optimized based on experimental data, and the threshold setting of the outdoor heat exchanger temperature change rate and the preset outdoor ambient temperature change rate takes into account the impact of external weather changes on the defrosting process. In addition, the setting of the preset defrosting time needs to take into account both defrosting effect and energy consumption control to ensure optimal defrosting management under different operating conditions.

[0105] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the air conditioner control method of this application will be described in detail below with reference to specific embodiments.

[0106] This embodiment relates to a specific control method for an air conditioner, such as... Figure 3 As shown, it includes the following steps:

[0107] Step S1: The air conditioner is set to heating mode, and the temperature (T) is checked. 设定 T 内环 When T is satisfied 设定 -T 内环 ≤ΔT1 or γ≤γ for 2 consecutive minutes 预设 If the pre-defrosting control mode is activated, then the current operating state will be maintained.

[0108] Step S2: Detect T 露点 T 外管 RH 外环 When T is satisfied 外管 <T 露点 Or satisfying α≥α 预设 Start the pre-defrost heating operation timer; otherwise, maintain the current operating status.

[0109] Step S3: Start the pre-defrost heating operation timer and continue heating operation until the pre-defrost heating operation timer τ is reached; detect T. 露点 T 外管 T 内环 Pre-defrosting control is implemented: the opening degree of the electronic expansion valve increases by ΔB, and the speed of the internal fan decreases by ΔR;

[0110] Step S4: Detect T 露点 T 外管 T 内环 Satisfying T 外管 -T 露点 ≥ΔT2 or satisfy T 内环2- T 内环1 ≥ΔT3 or satisfy T 内环2- T 内环1 <ΔT4 and β < β 预设 or satisfying σ≥σ max Exit the pre-defrost control mode and restore the normal heating operation mode; otherwise, maintain the current pre-defrost state.

[0111] The above embodiments, by detecting the difference between the indoor ambient temperature and the set temperature, as well as the rate of change of indoor temperature, enable the system to initiate pre-defrosting control when the indoor temperature tends to stabilize, avoiding the allocation of heat to the outdoors during periods of rapid indoor temperature rise and improving user comfort. By judging the difference between the outdoor heat exchanger temperature and the air dew point temperature, as well as the rate of change of outdoor relative humidity, the system can accurately identify frost formation trends and adjust heat allocation in advance, effectively suppressing frost formation. This is achieved through the initial timing threshold τ. 初始The pre-defrost heating operation timing τ, jointly determined by the dynamic adjustment factor k and the outdoor fan power variation coefficient f, enables the system to dynamically adjust the pre-defrost entry timing based on the current frosting risk and historical operating status, thereby improving system operating efficiency. By dynamically adjusting the electronic expansion valve opening ΔB and the indoor fan speed reduction ΔR during the pre-defrost stage, the system can distribute heat to the outdoor heat exchanger as needed, achieving the goal of suppressing frosting while minimizing the impact on indoor comfort.

[0112] In addition, if the impact on indoor temperature is minimal, pre-defrosting can be performed in advance to extend the indoor heating operation time and avoid frequent frosting and defrosting, which can cause the indoor temperature to fluctuate.

[0113] An experiment was conducted using a 3P inverter air conditioner with a specific cooling capacity. The results were compared between using this technical solution and not using it. The verification results are as follows:

[0114] Experimental conditions: Initial indoor temperature 7℃, outdoor temperature 2℃, outdoor humidity 80%; After the experiment begins, the indoor unit is turned off to allow the indoor temperature to rise freely, and it runs continuously for 6 hours.

[0115] After the indoor temperature stabilized during heating operation (after the first defrost), the heating operation time using this technical solution was 106 min and 98 min, with 2 defrost cycles. Without this technical solution, the heating operation time was 45 min, 49 min, 57 min, and 65 min, with 4 defrost cycles. The heating operation time was extended by 50.7% to 135.6%, and the number of defrost cycles was reduced by 50%. The indoor ambient temperature change curve of the air conditioner controlled using the above embodiment is shown below. Figure 4 As shown, the indoor ambient temperature change curve of the air conditioner not controlled by the above embodiment is as follows: Figure 5 As shown.

[0116] This application also provides a control device for an air conditioner. It should be noted that the control device for the air conditioner in this application can be used to execute the control method for an air conditioner provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0117] The control device for the air conditioner provided in the embodiments of this application will be described below.

[0118] Figure 6 This is a schematic diagram of the control device for an air conditioner according to an embodiment of this application. Figure 6As shown, the device includes an acquisition unit 10, a judgment unit 20, and a control unit 30. The acquisition unit 10 is used to acquire the operating parameters of the air conditioner, including: indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature, and outdoor relative humidity change rate. The judgment unit 20 is used to determine whether to activate the pre-defrost processing mode of the air conditioner based at least on the relationship between the operating parameters of the air conditioner and the corresponding preset values. The control unit 30 is used to, when the pre-defrost processing mode of the air conditioner is activated, control the air conditioner to continue running in heating mode for a target time, and then increase the opening of the electronic expansion valve and / or decrease the indoor fan speed of the air conditioner to perform pre-defrost processing on the air conditioner.

[0119] The control device for the air conditioner described in this application includes an acquisition unit, a judgment unit, and a control unit. The acquisition unit acquires the operating parameters of the air conditioner, including: indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature, and outdoor relative humidity change rate. The judgment unit determines whether to activate the air conditioner's pre-defrost mode based at least on the relationship between the air conditioner's operating parameters and their corresponding preset values. When the pre-defrost mode is activated, the control unit, after controlling the air conditioner to continue operating in heating mode for a target duration, increases the opening of the air conditioner's electronic expansion valve and / or decreases the indoor fan speed to perform pre-defrost processing. This method can pre-allocate some heat to the outdoor heat exchanger with minimal impact on indoor temperature, suppressing frost formation on the outdoor heat exchanger, extending the indoor heating operation time, and avoiding frequent frost formation and defrosting that causes sudden temperature fluctuations. It solves the problem that existing air conditioner defrosting methods struggle to effectively delay frost formation while ensuring indoor comfort, leading to frequent defrosting and large indoor temperature fluctuations.

[0120] In some embodiments, the determining unit includes: a first determining module, configured to determine the difference between the set temperature of the air conditioner and the indoor ambient temperature as a first difference, and to execute a second determining step if the first difference is less than or equal to a first preset difference and / or if the rate of change of the indoor ambient temperature remains less than or equal to a preset rate of change of the indoor ambient temperature within a preset time period; and a second determining module, configured to determine to activate the pre-defrosting mode of the air conditioner if the outdoor heat exchanger temperature is less than the outdoor air dew point temperature and / or the rate of change of the outdoor relative humidity is greater than or equal to a preset humidity change rate. By detecting the temperature rise of the outdoor heat exchanger and the magnitude of the indoor temperature change, the timing for completing the pre-defrosting is intelligently determined, and heating operation is restored in a timely manner, avoiding the impact of prolonged pre-defrosting on the indoor temperature and ensuring a comfortable user experience.

[0121] In some embodiments, the device further includes a first acquisition module and a first determination module. The first acquisition module is used to acquire the initial timing threshold, dynamic adjustment factor, and outdoor fan power variation coefficient of the air conditioner before controlling the air conditioner to continue operating in heating mode for a target duration. The first determination module is used to determine the target duration by multiplying the initial timing threshold, dynamic adjustment factor, and outdoor fan power variation coefficient of the air conditioner. The initial timing threshold is negatively correlated with a second difference, the outdoor fan power variation coefficient is the ratio of the outdoor fan power reference value to the outdoor fan power detection value, and the second difference is the difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature. This allows for precise control of the timing of heating operation and pre-defrost transition, achieving rational utilization of heat, reducing defrost frequency, and maintaining indoor comfort without significant impact.

[0122] In some embodiments, the first acquisition module includes a second acquisition module, a second determination module, and a third determination module. The second acquisition module is used to acquire the previous cycle heating operation time, the reference heating operation time, the previous cycle defrosting time, and the maximum allowable defrosting time of the air conditioner. The previous cycle heating operation time is the time from the end of the (n-2)th defrosting cycle to the start of the (n-1)th defrosting cycle. The previous cycle defrosting time is the time from the start of the (n-1)th defrosting cycle to the end of the (n-1)th defrosting cycle, where n is an integer greater than 2. The second determination module is used to determine the ratio of the previous cycle heating operation time to the reference heating operation time as a first ratio, the ratio of the previous cycle defrosting time to the maximum allowable defrosting time as a second ratio, and the difference between 1 and the second ratio as a third difference. The third determination module is used to determine the sum of the first ratio and the third difference as the dynamic adjustment factor. It can be adjusted according to different outdoor environmental conditions and the wind turbine power reference value to adapt to a wider range of operating scenarios.

[0123] In some embodiments, the control unit includes a third acquisition module, a fourth determination module, a fifth determination module, and an adjustment module. The third acquisition module is used to acquire the outdoor air dew point temperature of the air conditioner. The fourth determination module is used to determine the difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature, obtaining a fourth difference value. The fifth determination module is used to determine the opening adjustment value of the electronic expansion valve and the speed adjustment value of the indoor fan of the air conditioner based on the fourth difference value, wherein both the opening adjustment value and the speed adjustment value are positively correlated with the fourth difference value. The adjustment module is used to increase the opening of the electronic expansion valve of the air conditioner by the opening adjustment value, and / or decrease the speed adjustment value of the indoor fan of the air conditioner by the speed adjustment value. The adjustment of the opening of the electronic expansion valve and the speed of the indoor fan can also be further optimized according to the outdoor fan power variation coefficient to more accurately match the pre-defrosting requirements, while taking into account the balance between system energy consumption and operating efficiency.

[0124] In some embodiments, the above-mentioned device further includes a sixth determining module, a seventh determining module, a fourth acquiring module, and an eighth determining module. The sixth determining module is used to determine the difference between the outdoor heat exchanger temperature and the outdoor air dew point temperature as a fifth difference after pre-defrosting the air conditioner. The seventh determining module is used to determine the difference between the current indoor ambient temperature and the previous indoor ambient temperature as a sixth difference. The fourth acquiring module is used to acquire the outdoor heat exchanger temperature change rate and the pre-defrosting duration of the air conditioner. The eighth determining module is used to determine whether to end defrosting based on the magnitude of the fifth difference, the sixth difference, the outdoor heat exchanger temperature change rate, and the pre-defrosting duration. This achieves better energy utilization and user experience. In other embodiments not mentioned, this strategy can also optimize the defrosting process by adjusting algorithm parameters or introducing additional environmental variables, thereby improving the overall operating efficiency and reliability of the system.

[0125] In some embodiments, the eighth determining module includes a determining submodule, used to determine the end of defrosting when preset conditions are met. The preset conditions include at least one of the following: the fifth difference is greater than or equal to a second preset difference; the sixth difference is greater than or equal to a third preset difference; the sixth difference is less than a fourth preset difference and the outdoor heat exchanger temperature change rate is less than a preset outdoor ambient temperature change rate; and the pre-defrosting time is greater than or equal to the maximum pre-defrosting time. The setting of the preset defrosting time needs to consider both defrosting effect and energy consumption control to ensure optimal defrosting management under different operating conditions.

[0126] The control device of the aforementioned air conditioner includes a processor and a memory. The aforementioned acquisition units, etc., are all stored as program units in the memory, and the processor executes these program units stored in the memory to achieve the corresponding functions. All of the aforementioned modules are located in the same processor; alternatively, the aforementioned modules may be located in different processors in any combination.

[0127] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured. By adjusting kernel parameters, the problems of existing air conditioner defrosting methods, which fail to effectively delay frost formation while ensuring indoor comfort, leading to frequent defrosting and large fluctuations in indoor temperature, can be addressed.

[0128] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0129] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the control method of the air conditioner.

[0130] This invention provides a processor for running a program, wherein the program executes the control method of the air conditioner.

[0131] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements at least the steps of a control method for an air conditioner. The device described herein may be a server, PC, PAD, mobile phone, etc.

[0132] This application also provides a computer program product that, when executed on a data processing device, is adapted to execute a program that initializes a control method step having at least an air conditioner.

[0133] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0134] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0135] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0136] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0137] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0138] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0139] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0140] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0141] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0142] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0143] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0144] 1) The control method for the air conditioner described in this application first obtains the operating parameters of the air conditioner, including: indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature, and outdoor relative humidity change rate. Based at least on the relationship between the air conditioner's operating parameters and their corresponding preset values, it is determined whether to activate the air conditioner's pre-defrosting mode. If the pre-defrosting mode is activated, after controlling the air conditioner to continue operating in heating mode for a target duration, the opening of the air conditioner's electronic expansion valve is increased and / or the indoor fan speed is decreased to perform pre-defrosting. This method can pre-allocate some heat to the outdoor heat exchanger with minimal impact on indoor temperature, suppressing frost formation on the outdoor heat exchanger, extending the indoor heating operation time, and avoiding frequent frost formation and defrosting that causes sudden temperature fluctuations indoors. This solves the problem that existing air conditioner defrosting methods cannot effectively delay frost formation while ensuring indoor comfort, leading to frequent defrosting and large indoor temperature fluctuations.

[0145] 2) The control device for the air conditioner described in this application includes an acquisition unit, a judgment unit, and a control unit. The acquisition unit acquires the operating parameters of the air conditioner, including: indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature, and outdoor relative humidity change rate. The judgment unit determines whether to activate the pre-defrosting mode of the air conditioner, based at least on the relationship between the operating parameters and corresponding preset values. The control unit, when the pre-defrosting mode is activated, controls the air conditioner to continue operating in heating mode for a target duration, then increases the opening of the electronic expansion valve and / or decreases the indoor fan speed to perform pre-defrosting. This method can pre-allocate some heat to the outdoor heat exchanger with minimal impact on indoor temperature, suppressing frost formation on the outdoor heat exchanger, extending the indoor heating operation time, and avoiding frequent frost formation and defrosting that causes sudden temperature fluctuations indoors. This solves the problem that existing air conditioner defrosting methods cannot effectively delay frost formation while ensuring indoor comfort, leading to frequent defrosting and large indoor temperature fluctuations.

[0146] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control method for an air conditioner, characterized in that, include: The operating parameters of the air conditioner are obtained, including: indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature, and outdoor relative humidity change rate. Based at least on the relationship between the operating parameters of the air conditioner and the corresponding preset values, it is determined whether to activate the pre-defrosting mode of the air conditioner; When the pre-defrosting mode of the air conditioner is activated, after the air conditioner continues to run in heating mode for a target duration, the opening of the electronic expansion valve of the air conditioner is increased and / or the indoor fan speed of the air conditioner is decreased to perform pre-defrosting on the air conditioner. Before controlling the air conditioner to continue operating in heating mode for a target duration, the method further includes: obtaining the initial timing threshold, dynamic adjustment factor, and outdoor fan power variation coefficient of the air conditioner; determining the target duration by multiplying the initial timing threshold, dynamic adjustment factor, and outdoor fan power variation coefficient of the air conditioner, wherein the initial timing threshold is negatively correlated with a second difference, the outdoor fan power variation coefficient is the ratio of the outdoor fan power reference value to the outdoor fan power detection value of the air conditioner, and the second difference is the difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature.

2. The method according to claim 1, characterized in that, Based on the relationship between the air conditioner's operating parameters and corresponding preset values, determine whether to activate the air conditioner's pre-defrost mode, including: The first determining step involves determining the difference between the set temperature of the air conditioner and the indoor ambient temperature as a first difference, and executing the second determining step if the first difference is less than or equal to a first preset difference and / or if the rate of change of the indoor ambient temperature is continuously less than or equal to the preset rate of change of the indoor ambient temperature within a preset time period. The second determining step involves determining to activate the pre-defrosting mode of the air conditioner when the outdoor heat exchanger temperature is lower than the outdoor air dew point temperature and / or the outdoor relative humidity change rate is greater than or equal to a preset humidity change rate.

3. The method according to claim 1, characterized in that, Obtaining the dynamic adjustment factor includes: The system obtains the previous cycle heating operation time, the reference heating operation time, the previous cycle defrosting time, and the maximum allowable defrosting time of the air conditioner. The previous cycle heating operation time is the duration from the end of the (n-2)th defrosting cycle to the start of the (n-1)th defrosting cycle. The previous cycle defrosting time is the duration from the start of the (n-1)th defrosting cycle to the end of the (n-1)th defrosting cycle. Here, n is an integer greater than 2. The ratio of the heating operation time of the previous cycle to the reference heating operation time is determined as the first ratio, the ratio of the defrosting time of the previous cycle to the maximum allowable defrosting time is determined as the second ratio, and the difference between 1 and the second ratio is determined as the third difference. The sum of the first ratio and the third difference is determined as the dynamic adjustment factor.

4. The method according to claim 1, characterized in that, Increasing the opening of the electronic expansion valve of the air conditioner and / or decreasing the indoor fan speed of the air conditioner includes: Obtain the outdoor air dew point temperature of the air conditioner; The difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature is determined to obtain a fourth difference value; Based on the fourth difference, the opening adjustment value of the electronic expansion valve of the air conditioner and the speed adjustment value of the indoor fan of the air conditioner are determined, wherein the opening adjustment value and the speed adjustment value are both positively correlated with the fourth difference; Increase the opening value of the electronic expansion valve of the air conditioner by the opening adjustment value, and / or decrease the speed adjustment value of the indoor fan of the air conditioner by the speed adjustment value.

5. The method according to claim 1, characterized in that, After performing pre-defrosting on the air conditioner, the method further includes: The difference between the outdoor heat exchanger temperature and the outdoor air dew point temperature is defined as the fifth difference. The difference between the current indoor ambient temperature and the previous indoor ambient temperature is determined as the sixth difference. The outdoor heat exchanger temperature change rate and pre-defrost duration of the air conditioner are obtained; The decision to end defrosting is based on the fifth difference, the sixth difference, the outdoor heat exchanger temperature change rate, and the duration of pre-defrosting.

6. The method according to claim 5, characterized in that, Determining whether to terminate defrosting based on the fifth difference, the sixth difference, the outdoor heat exchanger temperature change rate, and the pre-defrosting duration includes: Under the condition that the preset conditions are met, the defrosting is terminated. The preset conditions include at least one of the following: the fifth difference is greater than or equal to the second preset difference, the sixth difference is greater than or equal to the third preset difference, the sixth difference is less than the fourth preset difference and the outdoor heat exchanger temperature change rate is less than the outdoor ambient temperature preset change rate, and the pre-defrosting time is greater than or equal to the maximum pre-defrosting time.

7. A control device for an air conditioner, characterized in that, include: The acquisition unit is used to acquire the operating parameters of the air conditioner, which include: indoor ambient temperature, indoor ambient temperature change rate, outdoor heat exchanger temperature, outdoor air dew point temperature, and outdoor relative humidity change rate. The judgment unit is used to determine whether to activate the pre-defrosting mode of the air conditioner, based at least on the relationship between the operating parameters of the air conditioner and the corresponding preset values. The control unit is configured to, when the pre-defrosting mode of the air conditioner is activated, control the air conditioner to continue running in heating mode for a target duration, and then increase the opening of the electronic expansion valve of the air conditioner and / or decrease the indoor fan speed of the air conditioner to perform pre-defrosting treatment on the air conditioner. The device further includes a first acquisition module and a first determination module. The first acquisition module is used to acquire the initial timing threshold, dynamic adjustment factor, and outdoor fan power change coefficient of the air conditioner before controlling the air conditioner to continue operating in heating mode for a target duration. The first determination module is used to determine the target duration by multiplying the initial timing threshold, dynamic adjustment factor, and outdoor fan power change coefficient of the air conditioner. The initial timing threshold is negatively correlated with a second difference. The outdoor fan power change coefficient is the ratio of the outdoor fan power reference value to the outdoor fan power detection value of the air conditioner. The second difference is the difference between the outdoor air dew point temperature and the outdoor heat exchanger temperature.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the control method of the air conditioner according to any one of claims 1 to 6.

9. An air conditioner, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a control method for performing an air conditioner according to any one of claims 1 to 6.

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