Air conditioner defrosting control method, air conditioner, related system and storage medium

Abstract

The application discloses a control method for defrosting of an air conditioner, the air conditioner, a related system and a storage medium, and comprises the following steps: controlling the refrigerant circulation of the air conditioner to be in a refrigeration cycle, controlling the indoor fan to be reversed, and controlling the auxiliary heater to be turned on; acquiring the temperature of the indoor heat exchanger in real time, controlling the power of the auxiliary heater according to the temperature of the indoor heat exchanger, and controlling the reverse rotating speed of the indoor fan according to the temperature of the indoor heat exchanger; and in response to the temperature of the outdoor heat exchanger reaching a target temperature, defrosting is completed. The above-mentioned heating of the auxiliary heater can meet the heat absorption demand of the indoor heat exchanger, sufficient heat can be transferred to the outdoor heat exchanger, and the defrosting efficiency can be improved. The reversal of the indoor fan can reduce the accumulation of heat when the auxiliary heater is turned on, and reduce the safety risk caused by local overheating. On the other hand, the reversal of the indoor fan can also reduce the problem of cold air blowing out of the air outlet of the air conditioner during defrosting, reduce the fluctuation of indoor temperature during defrosting of the air conditioner, and improve the comfort of the user during defrosting of the air conditioner.

Description

Technical Field

[0001] This application relates to the field of air conditioning control technology, and in particular to an air conditioning control method, an air conditioner, related systems and storage media. Background Technology

[0002] When air conditioners operate in heating mode or at low ambient temperatures for extended periods, their outdoor heat exchangers are prone to frost buildup, which can severely impact heating performance. Therefore, regular defrosting of the outdoor heat exchanger is necessary. However, the technical problems with air conditioner defrosting include low defrosting efficiency and prolonged defrosting time. Summary of the Invention

[0003] This application provides a control method for air conditioner defrosting, an air conditioner, related systems, and a storage medium. It can improve the defrosting efficiency of the outdoor heat exchanger and shorten the defrosting time.

[0004] The technical solution adopted in this application is to provide a control method for defrosting an air conditioner. The control method includes: controlling the refrigerant circulation of the air conditioner to be in a refrigeration cycle, controlling the indoor fan to reverse, and controlling the auxiliary heater to turn on; acquiring the temperature of the indoor heat exchanger in real time, controlling the power of the auxiliary heater according to the temperature of the indoor heat exchanger, and controlling the reverse rotation speed of the indoor fan according to the temperature of the indoor heat exchanger; and completing defrosting in response to the outdoor heat exchanger reaching the target temperature.

[0005] In one possible implementation, before the step of controlling the refrigerant circulation of the air conditioner to be in the refrigeration cycle, the method further includes: acquiring the operating parameters of the air conditioner, and determining whether to start defrosting based on the operating parameters; wherein the operating parameters include one or more of the following: the coil temperature of the outdoor heat exchanger, the continuous heating duration of the air conditioner, the outdoor ambient temperature, and the outdoor ambient humidity.

[0006] In one possible implementation, the step of controlling the refrigerant circulation of the air conditioner to be in a refrigeration cycle specifically includes: controlling the compressor frequency to decrease to a set switching frequency; controlling the four-way valve to switch directions; and controlling the compressor frequency to increase to the rated defrost frequency.

[0007] In one possible implementation, the step of controlling the power of the auxiliary heater based on the temperature of the indoor heat exchanger specifically includes: the higher the temperature of the indoor heat exchanger, the lower the power of the auxiliary heater.

[0008] In one possible implementation, the temperature range includes a normal heating range and an over-temperature protection range, and the percentage of output power corresponding to the normal heating range decreases step by step as the temperature of the indoor heat exchanger increases. When the temperature of the indoor heat exchanger is within the over-temperature protection range, the auxiliary heater is immediately shut down.

[0009] In one possible implementation, the step of controlling the power of the auxiliary heater to be lower as the temperature of the indoor heat exchanger is higher specifically includes: pre-establishing a mapping relationship between the temperature range of the indoor heat exchanger and the power of the auxiliary heater; determining the temperature range in which the temperature of the indoor heat exchanger is located, and controlling the power of the auxiliary heater to be the power corresponding to the temperature range.

[0010] In one possible implementation, the temperature range includes a normal heating range and an over-temperature protection range. The percentage of output power corresponding to the normal heating range decreases as the temperature of the indoor heat exchanger increases. When the temperature of the indoor heat exchanger is in the over-temperature protection range, the auxiliary heater is controlled to shut down.

[0011] In one possible implementation, the step of controlling the reverse rotation speed of the indoor fan based on the temperature of the indoor heat exchanger specifically includes: the higher the temperature of the indoor heat exchanger, the greater the reverse rotation speed of the indoor fan.

[0012] In one possible implementation, the formula for calculating the reverse rotation speed of the indoor fan is: R_ps = ΔR_ps + (TE - ΔTE) * KP / (R_psmax - R_psmin); where R_ps is the reverse rotation speed of the indoor fan, ΔR_ps is the reverse rotation speed of the indoor fan in the previous cycle, TE is the temperature of the indoor heat exchanger, ΔTE is the temperature of the indoor heat exchanger in the previous cycle, KP is the speed regulation ratio coefficient, R_psmax is the upper limit of the speed, and R_psmin is the lower limit of the speed.

[0013] In one possible implementation, after the defrosting step is completed in response to the outdoor heat exchanger reaching the target temperature, the method further includes: controlling the refrigerant circulation of the air conditioner to switch to heating circulation, controlling the auxiliary heater to turn off, controlling the indoor fan to stop reversing, and controlling the compressor's operating frequency to rise to the heating target frequency.

[0014] Another technical solution adopted in this application is to provide a defrosting control system for an air conditioner, characterized in that it includes: a control module for controlling the refrigerant circulation of the air conditioner to be in a refrigeration cycle, controlling the indoor fan to reverse, and controlling the auxiliary heater to turn on; a temperature acquisition module for acquiring the temperature of the indoor heat exchanger; an adjustment module for controlling the power of the auxiliary heater according to the temperature of the indoor heat exchanger, and controlling the reverse rotation speed of the indoor fan according to the temperature of the indoor heat exchanger; and an exit module for controlling the air conditioner to exit the defrosting mode when the temperature of the outdoor heat exchanger reaches the target temperature.

[0015] Another technical solution adopted in this application is to provide an air conditioner that controls defrosting through the above-mentioned air conditioner defrosting control method.

[0016] Another technical solution adopted in this application is to provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-mentioned air conditioner defrosting control method.

[0017] The beneficial effects of this application are as follows: This application provides a control method for air conditioner defrosting. During defrosting, this method controls the reverse rotation speed of the indoor fan and the power of the auxiliary heater based on the temperature of the indoor heat exchanger. The auxiliary heater's heating capacity meets the heat absorption requirements of the indoor heat exchanger, ensuring sufficient heat transfer to the outdoor heat exchanger and improving defrosting efficiency. The reverse rotation of the indoor fan reduces heat accumulation when the auxiliary heater is activated, minimizing the safety risks caused by localized overheating. Furthermore, the reverse rotation of the indoor fan also reduces the problem of cold air blowing from the air conditioner outlet during defrosting, minimizing indoor temperature fluctuations and improving user comfort during defrosting. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a diagram showing the refrigerant flow direction when the air conditioner of this application is in the refrigeration cycle; Figure 2 This is a diagram showing the refrigerant flow direction when the refrigerant circulation of the air conditioner in this application is in the heating cycle; Figure 3 This is a flowchart illustrating one embodiment of the air conditioner defrosting control method of this application; Figure 4This is a flowchart illustrating the first embodiment of the air conditioner defrosting control method of this application, which controls the refrigerant circulation of the air conditioner to be in the refrigeration cycle. Figure 5 This is a schematic block diagram of the structure of an embodiment of the electronic device of this application; Figure 6 This is a schematic block diagram of a computer-readable storage medium according to an embodiment of the present application; Figure 7 This is a structural block diagram of an embodiment of the air conditioner defrosting control system of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless otherwise clearly indicated above. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0022] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0023] It should be understood that the terms "comprising," "including," or any other variations used herein are intended to cover a 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 a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0024] In related technologies, the technical problems of air conditioner defrosting are: low defrosting efficiency of outdoor heat exchangers and long defrosting time.

[0025] To address the aforementioned problems, this application proposes a control method for air conditioner defrosting, an air conditioner, related systems, and a storage medium. During defrosting, this control method controls the reverse rotation speed of the indoor fan by controlling the temperature of the indoor heat exchanger, and also controls the power of the auxiliary heater by controlling the temperature of the indoor heat exchanger, effectively solving the aforementioned technical problems.

[0026] The following describes in detail, with reference to the accompanying drawings and embodiments, a control method for air conditioner defrosting, an air conditioner, related systems, and a storage medium provided in this application.

[0027] This application provides a defrosting control method for an air conditioner, used to defrost the outdoor heat exchanger of the air conditioner. Correspondingly, this application also provides an air conditioner that controls defrosting using the defrosting control method described in any embodiment of this application. Please refer to [link to relevant documentation]. Figure 1 , Figure 1 This is a diagram showing the refrigerant flow direction when the air conditioner of this application is in the refrigeration cycle. In a specific embodiment, the air conditioner 100 includes a four-way valve 11, a compressor 12, a throttle valve 15, an outdoor heat exchanger 13, an indoor heat exchanger 14, an indoor fan 16, and an auxiliary heater (not shown).

[0028] The compressor 12 is used to compress the low-temperature, low-pressure gaseous refrigerant, transforming it into a high-temperature, high-pressure gaseous refrigerant. The four-way valve 11 is used to switch states and change the flow direction of the refrigerant. In the air conditioner 100, it plays the role of switching the refrigerant circulation direction. When the refrigerant circulation is in the cooling cycle, the four-way valve 11 causes the refrigerant to flow to the outdoor heat exchanger 13. When the refrigerant circulation is in the heating cycle, the four-way valve 11 changes its internal connection state, causing the refrigerant to first flow through the indoor heat exchanger 14 and then to the outdoor heat exchanger 13.

[0029] The indoor fan 16 serves two main functions: firstly, it blows indoor air across the surface of the indoor heat exchanger 14, accelerating heat exchange; secondly, it blows air onto the auxiliary heater when it is activated, reducing localized heat accumulation and mitigating the risk of thermal runaway. In this embodiment, the indoor fan 16 is a bidirectional fan, capable of both forward and reverse rotation. When rotating forward, the fan blows air to exchange heat with the indoor heat exchanger 14, while air is simultaneously expelled from the air outlet of the air conditioner 100. When rotating in reverse, the fan draws air inward to exchange heat with the heat exchanger 14, resulting in minimal airflow from the air conditioner 100's outlet.

[0030] like Figure 1 As shown, Figure 1 The diagram shows the refrigerant flow direction when the refrigerant circulation of the air conditioner in this application is in the refrigeration cycle.

[0031] When the refrigerant is in the refrigeration cycle, the refrigerant flows in the following order: compressor 12 (discharge) → four-way valve 11 (towards the outdoor heat exchanger) → outdoor heat exchanger 13 → expansion valve 15 → indoor heat exchanger 14 → four-way valve 11 (towards the indoor heat exchanger) → compressor 12 (suction). The compressor 12 is used to convert the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The process of the high-temperature, high-pressure refrigerant flowing from the compressor 12 to the four-way valve 11 is called compressor 12 discharge. In the refrigeration cycle, the high-temperature, high-pressure gaseous refrigerant first enters the outdoor heat exchanger 13, where it is cooled by exchanging heat with the ambient air, releasing heat and becoming a medium-temperature, high-pressure liquid refrigerant. The medium-temperature, high-pressure liquid refrigerant exiting the outdoor heat exchanger 13 passes through the expansion valve 15, where a sudden pressure drop causes partial evaporation and heat absorption, forming a low-temperature, low-pressure gas-liquid mixture. This mixture enters the indoor heat exchanger 14, where it exchanges heat with the indoor air, absorbing heat and evaporating into a low-temperature, low-pressure gaseous refrigerant. Therefore, in the refrigeration cycle, the refrigerant flows at high temperature and high pressure from the compressor 12 to the four-way valve 11, from the four-way valve 11 to the outdoor heat exchanger 13, and from the outdoor heat exchanger 13 to the expansion valve 15. The refrigerant flows from the expansion valve 15 to the indoor heat exchanger 14, from the indoor heat exchanger 14 to the four-way valve 11, and from the four-way valve 11 to the compressor 12. The refrigerant flows at a low temperature and low pressure. The process of the low-temperature, low-pressure refrigerant flowing from the four-way valve 11 to the compressor 12 is called compressor 12 intake. Meanwhile, during the refrigeration cycle, the refrigerant in the outdoor heat exchanger 13 flows at a high temperature and high pressure, thus achieving the purpose of defrosting the outdoor heat exchanger 13.

[0032] Please see Figure 2 , Figure 2 This is a diagram showing the refrigerant flow direction when the air conditioner of this application is in the heating cycle.

[0033] When the refrigerant circulation is in heating mode, the four-way valve 11 reverses, causing the refrigerant to circulate in the following sequence: compressor 12 (discharge) → four-way valve 11 (indoor heat exchanger channel) → indoor heat exchanger 14 → expansion valve 15 → outdoor heat exchanger 13 → four-way valve 11 (outdoor heat exchanger channel) → compressor 12 (intake). During heating, the refrigerant flows at high temperature and high pressure from compressor 12 to four-way valve 11, from four-way valve 11 to indoor heat exchanger 14, and from indoor heat exchanger 14 to expansion valve 15. From expansion valve 15 to outdoor heat exchanger 13, from outdoor heat exchanger 13 to four-way valve 11, and from four-way valve 11 to compressor 12, the refrigerant flows at low temperature and low pressure. During heating, the high-temperature, high-pressure refrigerant in indoor heat exchanger 14 releases heat into the indoor air.

[0034] As described above, when the refrigerant circulation of the air conditioner 100 is controlled as a refrigeration cycle, the refrigerant in the outdoor heat exchanger 13 flows in a high-temperature and high-pressure state, thereby achieving the purpose of defrosting.

[0035] To improve the defrosting efficiency of the outdoor heat exchanger and shorten the defrosting time, this application proposes a control method for air conditioning defrosting.

[0036] Please see Figure 3 , Figure 3 This is a flowchart illustrating one embodiment of the air conditioner defrosting control method of this application. In one specific embodiment, the control method includes: S11: Controls the refrigerant circulation of the air conditioner to be in the cooling cycle, controls the indoor fan to reverse, and controls the auxiliary heater to turn on.

[0037] The refrigeration cycle is described in detail above. In this embodiment, during defrosting, the refrigerant circulation is controlled to be in the refrigeration cycle, so that the refrigerant in the outdoor heat exchanger flows in a high temperature and high pressure state, which can heat the outdoor heat exchanger and melt the frost on the outdoor heat exchanger.

[0038] In this step, the auxiliary heater is turned on to supplement the heat of the indoor heat exchanger, which can increase the heat absorption of the indoor heat exchanger so that more heat can be transferred to the outdoor heat exchanger, thereby increasing the heating rate of the outdoor heat exchanger and improving the defrosting efficiency.

[0039] In this step, the indoor fan is also controlled to reverse. On one hand, reversing the indoor fan reduces heat buildup when the auxiliary heater is turned on, minimizing the safety risks caused by localized overheating. On the other hand, reversing the indoor fan accelerates airflow near the indoor heat exchanger, thereby improving the heat exchange efficiency between the indoor heat exchanger and the indoor air, further increasing the heat absorption of the indoor fan, and allowing more heat to be transferred to the outdoor heat exchanger, thus further increasing the defrosting efficiency of the outdoor heat exchanger. Additionally, this step controls the indoor fan to rotate in reverse. When the indoor fan rotates in reverse, the air conditioner's outlet draws air in from the outside in, so that during defrosting, the air conditioner's outlet will essentially not blow out cold air. This reduces heat buildup and accelerates defrosting through the operation of the indoor fan, while also reducing the problem of the air conditioner blowing cold air when the indoor fan is running in the cooling cycle, minimizing indoor temperature fluctuations during defrosting, and improving user comfort during the defrosting process.

[0040] When the air conditioner begins defrosting, the four-way valve switches to a refrigeration cycle for the refrigerant. The indoor heat exchanger is usually at a lower temperature and needs to absorb more heat from the outside to transfer enough heat to the outdoor heat exchanger for defrosting. To meet the heat absorption requirements of the refrigerant in the indoor heat exchanger during the initial defrosting stage, in some preferred embodiments, the auxiliary heater is controlled to heat at a relatively high power when the air conditioner begins defrosting. As defrosting progresses and the temperature of the indoor heat exchanger rises, the power of the auxiliary heater is gradually reduced. This satisfies the heat absorption requirements of the refrigerant in the indoor heat exchanger while reducing the problem of overheating of the indoor heat exchanger by the auxiliary heater.

[0041] In some implementations, this step further includes: turning off the outdoor fan to stop blowing air onto the outdoor heat exchanger during defrosting, reducing heat exchange between the outdoor heat exchanger and the outside air, allowing the outdoor heat exchanger to maintain a higher temperature and improving defrosting efficiency.

[0042] S12: Real-time acquisition of the temperature of the indoor heat exchanger, control of the power of the auxiliary heater based on the temperature of the indoor heat exchanger, and control of the reverse rotation speed of the indoor fan based on the temperature of the indoor heat exchanger.

[0043] In this step, the power of the auxiliary heater is controlled by the temperature of the indoor heat exchanger. The lower the temperature of the indoor heat exchanger, the more heat it needs to absorb from the environment in order to transfer enough heat to the outdoor heat exchanger after being absorbed by the refrigerant inside the indoor heat exchanger. To meet the heat absorption requirements of the indoor heat exchanger, the higher the temperature of the indoor heat exchanger, the lower the power of the auxiliary heater; conversely, the lower the temperature of the indoor heat exchanger, the higher the power of the auxiliary heater.

[0044] In some specific implementations, the temperature range of the indoor heat exchanger can be divided into several continuous temperature intervals. Each temperature interval of the indoor heat exchanger corresponds to a fixed power level of the auxiliary heater. When the temperature of the indoor heat exchanger changes and the temperature interval changes, the power of the auxiliary heater is switched to the corresponding temperature interval's power level. Smaller temperature intervals correspond to higher power levels of the auxiliary heater, and larger temperature intervals correspond to lower power levels of the auxiliary heater. In other implementations, the power of the auxiliary heater can also exhibit a linear negative correlation with the temperature of the indoor heat exchanger within its temperature range. For example, for every 1 degree Celsius increase in the temperature of the indoor heat exchanger, the power decreases by a fixed percentage of 2%. When the temperature of the indoor heat exchanger increases by 5 degrees Celsius, the power of the auxiliary heater decreases by 10%. This linear negative correlation control scheme allows for smoother changes in the power of the auxiliary heater, making the correlation between the power of the auxiliary heater and the temperature of the indoor heat exchanger stronger.

[0045] In other implementations, the power of the auxiliary heater can be controlled to have a non-linear, negative correlation with the temperature of the indoor heat exchanger. For example, when the temperature of the indoor heat exchanger is low, the power of the auxiliary heater is controlled to decrease rapidly with changes in the indoor heat exchanger temperature; conversely, when the temperature of the indoor heat exchanger is high, the power of the auxiliary heater is controlled to decrease slowly with changes in the indoor heat exchanger temperature. This control logic can assist in heating the indoor heat exchanger with a larger temperature increase as the indoor heat exchanger temperature is lower, thus improving the problem of slow defrosting rate during the start-up phase of defrosting.

[0046] In this step, the reverse rotation speed of the indoor fan is controlled by the temperature of the indoor heat exchanger. The lower the temperature of the indoor heat exchanger, the lower the temperature of the airflow formed at the air conditioner's outlet, and the more likely cold air will be blown out of the outlet. Therefore, maintaining a lower reverse rotation speed reduces the probability of cold air being blown out. To reduce the problem of the air conditioner blowing cold air when the indoor fan is on during defrosting, the higher the temperature of the indoor heat exchanger, the higher the reverse rotation speed of the indoor fan; the lower the temperature of the indoor heat exchanger, the lower the reverse rotation speed of the indoor fan.

[0047] In some implementations, the reverse rotation speed of the indoor fan can be linearly positively correlated with the temperature of the indoor heat exchanger within its temperature range. For example, for every 1 degree Celsius increase in the temperature of the indoor heat exchanger, the reverse rotation speed of the indoor fan increases by 2 rpm (revolutions per minute). When the temperature of the indoor heat exchanger increases by 5 degrees Celsius, the reverse rotation speed of the indoor fan increases by 10%. In other implementations, the temperature range of the indoor heat exchanger can be divided into several continuous temperature intervals, each temperature interval corresponding to a fixed reverse rotation speed. When the temperature of the indoor heat exchanger changes, resulting in a change within a temperature interval, the reverse rotation speed of the indoor fan is switched to the speed corresponding to that temperature interval. Smaller temperature intervals correspond to smaller reverse rotation speeds of the indoor fan, while larger temperature intervals correspond to larger reverse rotation speeds of the indoor fan.

[0048] S13: Defrosting is complete in response to the outdoor heat exchanger reaching the target temperature.

[0049] When the outdoor heat exchanger reaches the target temperature, the frost on it will completely melt. The target temperature can be a suitable temperature, such as 7 degrees Celsius, 8 degrees Celsius, or 6 degrees Celsius, where the ice will completely melt.

[0050] In some embodiments, after defrosting is completed, the auxiliary heater is turned off first, and then the indoor fan is turned off to reduce the risk of overheating.

[0051] In some embodiments, if the air conditioner is in heating mode before defrosting, the control method after S13 further includes: controlling the refrigerant circulation of the air conditioner to switch to heating circulation, controlling the auxiliary heater to turn off, controlling the indoor fan to stop reversing, and controlling the compressor's operating frequency to rise to the heating target frequency. Additionally, in some embodiments, after defrosting is completed, the indoor fan is controlled to rotate forward only after a preset delay time has elapsed. The preset delay time can be from 30 seconds to 60 seconds, for example, specifically 30 seconds, 40 seconds, 55 seconds, 60 seconds, etc.

[0052] In some other embodiments, if the air conditioner is in heating mode before defrosting, after S13, the control method further includes: controlling the compressor frequency to decrease to a set switching frequency; controlling the refrigerant circulation of the air conditioner to switch to heating circulation; controlling the auxiliary heater to turn off; controlling the indoor fan to stop reversing and then switch back to forward mode; and controlling the compressor operating frequency to increase to the heating target frequency. Specifically, the set switching frequency is a relatively low frequency, and the value range of the set switching frequency can be from 0 Hz to 50 Hz. For example, the set switching frequency can be 0 Hz, 10 Hz, 30 Hz, 50 Hz, etc., wherein when the compressor frequency is 0 Hz, the compressor is turned off. Before controlling the air conditioner to return to heating mode, the compressor frequency is first controlled to decrease. This step can reduce the pressure difference between the high-pressure side and the low-pressure side inside the air conditioner's pipes, reduce the noise caused by the instantaneous impact of high-pressure refrigerant on the internal slider of the four-way valve when the four-way valve switches, and also reduce the instantaneous impact of high-pressure refrigerant, reducing the risk of compressor damage. In this embodiment, the auxiliary heater is first shut off, and then the indoor fan is switched from reverse rotation mode to forward rotation mode. This ensures that the indoor fan does not change its operating mode while the auxiliary heater is working, allowing for continuous and uninterrupted airflow to the auxiliary heater and reducing the risk of overheating. In some embodiments, after defrosting is complete and the indoor fan stops reversing for a preset delay time, the indoor fan is then switched to forward rotation. The preset delay time can be from 30 seconds to 60 seconds, specifically 30 seconds, 40 seconds, 55 seconds, or 60 seconds.

[0053] In some embodiments, before executing S11, the control method further includes: acquiring the operating parameters of the air conditioner, and determining whether to start defrosting based on the operating parameters; wherein the operating parameters include one or more of the following: the coil temperature of the outdoor heat exchanger, the continuous heating duration of the air conditioner, the outdoor ambient temperature, and the outdoor ambient humidity. For example, in some embodiments, the operating parameters include the coil temperature of the outdoor heat exchanger; when the coil temperature of the outdoor heat exchanger reaches the set coil temperature, defrosting is started, and the above-mentioned S11 is executed. In some embodiments, the operating parameters include the continuous heating duration of the air conditioner; when the continuous heating duration of the air conditioner reaches the set duration, defrosting is started, and the above-mentioned S11 is executed. In some embodiments, the operating parameters include the outdoor ambient temperature; when the outdoor ambient temperature is lower than the set ambient temperature, defrosting is started, and the above-mentioned S11 is executed. In some embodiments, the operating parameters include the outdoor ambient humidity; when the outdoor ambient humidity is higher than the set ambient humidity, defrosting is started, and the above-mentioned S11 is executed. In some other embodiments, the operating parameters include any of the above parameters. For example, the operating parameters may include the continuous heating duration of the air conditioner and the outdoor ambient humidity. When the continuous heating duration of the air conditioner reaches the set duration and the outdoor ambient humidity is greater than the set ambient humidity, defrosting is started and the above S11 is executed.

[0054] Please refer to the following: Figure 4, Figure 4 This is a flowchart illustrating an embodiment of step one of the air conditioner defrosting control methods of this application, which involves controlling the refrigerant circulation of the air conditioner to be in a refrigeration cycle. In some embodiments, step S11, controlling the refrigerant circulation of the air conditioner to be in a refrigeration cycle, may include: S111: Controls the compressor frequency to decrease to the set switching frequency.

[0055] The compressor is set to a relatively low switching frequency, and the value range of the switching frequency can be from 0 Hz to 50 Hz. For example, the switching frequency can be set to 0 Hz, 10 Hz, 30 Hz, 50 Hz, etc. When the compressor frequency is 0 Hz, the compressor stops.

[0056] In this embodiment, before the refrigerant circulation switching and the four-way valve switching, the compressor frequency is first controlled to decrease. This step can reduce the pressure difference between the high-pressure side and the low-pressure side inside the air conditioner's pipes, reduce the noise caused by the instantaneous impact of high-pressure refrigerant on the internal slider of the four-way valve when the four-way valve switches, and also reduce the instantaneous impact of high-pressure refrigerant, thus reducing the risk of compressor damage.

[0057] S112: Controls the reversing of the four-way valve.

[0058] Controlling the refrigerant recirculation process of the four-way valve results in the following flow: compressor (discharge) → four-way valve (to outdoor heat exchanger) → outdoor heat exchanger → throttle valve → indoor heat exchanger → four-way valve (to indoor heat exchanger) → compressor (intake).

[0059] S113: Controls the compressor frequency to rise to the rated defrost frequency.

[0060] The rated defrosting frequency can be from 70 Hz to 90 Hz, for example, the rated defrosting frequency can be 70 Hz, 80 Hz, 90 Hz, etc.

[0061] In some embodiments, the step of controlling the power of the auxiliary heater according to the temperature of the indoor heat exchanger in S12 specifically includes: the higher the temperature of the indoor heat exchanger, the lower the power of the auxiliary heater. This control scheme enables the auxiliary heater to provide sufficient heat absorption for the indoor heat exchanger. In some specific embodiments, the step of controlling the power of the auxiliary heater to be lower as the temperature of the indoor heat exchanger increases specifically includes: pre-establishing a mapping relationship between the temperature range of the indoor heat exchanger and the power of the auxiliary heater; determining the temperature range in which the indoor heat exchanger is located, and controlling the power of the auxiliary heater to be the power corresponding to the temperature range. For example, when the temperature range is 0 degrees Celsius to 10 degrees Celsius, it corresponds to 60% of the auxiliary heater's output power; when the temperature range is 10 degrees Celsius to 15 degrees Celsius, it corresponds to 40% of the auxiliary heater's output power; when the temperature range is 15 degrees Celsius to 20 degrees Celsius, it corresponds to 30% of the auxiliary heater's output power; and when the temperature range is 20 degrees Celsius to 30 degrees Celsius, it corresponds to 20% of the auxiliary heater's output power. When the temperature of the indoor heat exchanger changes within a specific temperature range, the power of the auxiliary heater is switched to the output ratio corresponding to that temperature range.

[0062] In some embodiments, the temperature range includes a normal heating range and an over-temperature protection range. The output power percentage corresponding to the normal heating range decreases progressively as the indoor heat exchanger temperature increases. When the indoor heat exchanger temperature is within the over-temperature protection range, the auxiliary heater is shut down. Specifically, the normal heating range may include multiple temperature sub-ranges, each corresponding to a different output power percentage of the auxiliary heater. Higher temperatures in the sub-range correspond to lower output power percentages of the auxiliary heater. The over-temperature protection range has a higher temperature than the normal heating range. Specifically, the over-temperature protection range can be a temperature range where the indoor heat exchanger is at risk of overheating and potentially affecting equipment safety. When the indoor heat exchanger temperature is within the over-temperature protection range, the auxiliary heater is shut down to reduce the risk of overheating due to a continuous rise in indoor heat exchanger temperature. In some embodiments, the over-temperature protection range can be a temperature range greater than 30 degrees Celsius. In other embodiments, the over-temperature protection range can also be a temperature range greater than 25 degrees Celsius, 28 degrees Celsius, 33 degrees Celsius, or other reasonable temperatures.

[0063] In some embodiments, the step of controlling the reverse rotation speed of the indoor fan according to the temperature of the indoor heat exchanger in S12 specifically includes: the higher the temperature of the indoor heat exchanger, the greater the reverse rotation speed of the indoor fan. Specifically, the lower the temperature of the indoor heat exchanger, the lower the temperature of the airflow formed at the air conditioner's outlet, and the greater the probability of cold air being generated at the air conditioner's outlet. Therefore, maintaining a lower reverse rotation speed can reduce the probability of cold air being blown out. To reduce the problem of the air conditioner easily blowing cold air when the indoor fan is turned on during defrosting, the higher the temperature of the indoor heat exchanger, the greater the reverse rotation speed of the indoor fan; the lower the temperature of the indoor heat exchanger, the smaller the reverse rotation speed of the indoor fan.

[0064] In some specific embodiments, the formula for calculating the reverse rotation speed of the indoor fan is: R_ps = ΔR_ps + (TE - ΔTE) * KP / (R_psmax - R_psmin); where R_ps is the reverse rotation speed of the indoor fan, ΔR_ps is the reverse rotation speed of the indoor fan in the previous cycle, TE is the temperature of the indoor heat exchanger, ΔTE is the temperature of the indoor heat exchanger in the previous cycle, KP is the speed regulation ratio coefficient, R_psmax is the upper limit of the speed, and R_psmin is the lower limit of the speed. In this embodiment, the adjustment cycle for the reverse rotation speed of the indoor fan is 20 seconds. In some other embodiments, the adjustment cycle can also be a reasonable value such as 15 seconds, 25 seconds, 10 seconds, or 30 seconds. In this embodiment, the upper limit of the speed is 350 rpm. In some other embodiments, the upper limit of the speed can also be a reasonable speed such as 300 rpm, 330 rpm, or 380 rpm. In this embodiment, the lower limit of the rotational speed is 200 rpm. In some other embodiments, the lower limit of the rotational speed can also be a reasonable speed such as 180 rpm, 190 rpm, or 210 rpm. In this embodiment, the speed regulation ratio coefficient is 300. In some other embodiments, the specific value of the speed regulation ratio coefficient can be adjusted according to the actual operating conditions of the air conditioner, such as the sensitivity of the indoor fan speed change.

[0065] In some embodiments, step S12, which controls the power of the auxiliary heater based on the temperature of the indoor heat exchanger, further includes: controlling the auxiliary heater to shut down in response to the indoor heat exchanger temperature reaching a threshold temperature. In this embodiment, the threshold temperature is specifically 30 degrees Celsius. When the indoor heat exchanger temperature reaches 30 degrees Celsius, the auxiliary heater is controlled to shut down. In some other embodiments, the threshold temperature can also be a reasonable temperature such as 28 degrees Celsius, 35 degrees Celsius, or 33 degrees Celsius. When the indoor heat exchanger temperature reaches the threshold temperature, the indoor heat exchanger does not need additional heating through the auxiliary heater to transfer sufficient heat to the outdoor heat exchanger. Controlling the auxiliary heater to shut down when the indoor heat exchanger temperature reaches the threshold temperature reduces the problem of overheating and avoids the risk of air conditioning overheating.

[0066] Finally, in a specific application scenario, the defrosting control method of this application is used to control defrosting, and the operating parameters of the air conditioner during the defrosting process are shown in Table 1: Table 1

[0067] In this application scenario, the indoor ambient temperature is 15 degrees Celsius, and the outdoor ambient temperature is -5 degrees Celsius. The relationship between the indoor heat exchanger temperature and the auxiliary heater power is as follows: when the temperature range is 0 to 10 degrees Celsius, the auxiliary heater operates at 60% of its output power; when the temperature range is 10 to 15 degrees Celsius, the auxiliary heater operates at 40% of its output power; when the temperature range is 15 to 20 degrees Celsius, the auxiliary heater operates at 30% of its output power; and when the temperature range is 20 to 30 degrees Celsius, the auxiliary heater operates at 20% of its output power. The formula for calculating the reverse rotation speed of the indoor fan is: R_ps = ΔR_ps + (TE - ΔTE) * KP / (R_psmax - R_psmin); where KP is 300, the adjustment cycle for the reverse rotation speed is 20 seconds, the lower limit of the speed is 200 rpm, the upper limit of the speed is 350 rpm, and the target temperature of the outdoor heat exchanger is 7 degrees Celsius. As shown in Table 1, at 20 seconds, the air conditioner begins defrosting, with the reverse rotation speed at 200 rpm and the auxiliary heater operating at 40% of its output power. At 60 seconds, the indoor heat exchanger temperature rises to 15 degrees Celsius, the reverse rotation speed increases to 210 rpm, and the auxiliary heater power decreases to 30% of its output power. At 80 seconds, the indoor heat exchanger temperature rises to 18 degrees Celsius, the reverse rotation speed increases to 216 rpm, and the auxiliary heater power remains at 30% of its output power. At 100 seconds, the outdoor heat exchanger temperature rises to the target temperature of 7 degrees Celsius, defrosting is complete, the four-way valve switches to refrigerant circulation for heating, the indoor heat exchanger temperature drops to 10 degrees Celsius, and the indoor fan and auxiliary heater shut off.

[0068] This application provides a control method for air conditioner defrosting. During defrosting, this method controls the reverse rotation speed of the indoor fan and the power of the auxiliary heater based on the temperature of the indoor heat exchanger. The auxiliary heater's heating meets the heat absorption requirements of the indoor heat exchanger, ensuring sufficient heat transfer to the outdoor heat exchanger and improving defrosting efficiency. The reverse rotation of the indoor fan reduces heat accumulation when the auxiliary heater is activated, minimizing the safety risks caused by localized overheating. Furthermore, the reverse rotation of the indoor fan also reduces the problem of cold air blowing from the air conditioner outlet during defrosting, minimizing indoor temperature fluctuations and improving user comfort during defrosting.

[0069] Correspondingly, this application also proposes an electronic device, please refer to [link to relevant documentation]. Figure 5 , Figure 5This is a schematic block diagram illustrating the structure of an embodiment of the electronic device of this application. The electronic device 200 includes a processor 220 and a memory 210. The memory 210 is connected to the processor 220 and is used to store computer programs that can run on the processor 220; wherein, when the processor 220 executes the computer program, it implements the air conditioner defrosting control method of any of the above embodiments, the control method including: controlling the refrigerant circulation of the air conditioner to be in a refrigeration cycle, controlling the indoor fan to reverse, and controlling the auxiliary heater to turn on; acquiring the temperature of the indoor heat exchanger in real time, controlling the power of the auxiliary heater according to the temperature of the indoor heat exchanger, and controlling the reverse rotation speed of the indoor fan according to the temperature of the indoor heat exchanger; and completing defrosting in response to the outdoor heat exchanger temperature reaching the target temperature. This application also provides a computer-readable storage medium; please refer to [link to relevant documentation]. Figure 6 , Figure 6 This is a schematic block diagram illustrating the structure of one embodiment of the computer-readable storage medium of this application. The computer-readable storage medium 30 of this application stores a computer program 300. When executed by a processor, the computer program 300 implements the air conditioner defrosting control method of any of the above embodiments. In some embodiments, the control method includes: controlling the refrigerant circulation of the air conditioner to be in a refrigeration cycle, controlling the indoor fan to reverse direction, and controlling the auxiliary heater to turn on; acquiring the temperature of the indoor heat exchanger in real time, controlling the power of the auxiliary heater according to the temperature of the indoor heat exchanger, and controlling the reverse rotation speed of the indoor fan according to the temperature of the indoor heat exchanger; and completing defrosting in response to the outdoor heat exchanger temperature reaching a target temperature.

[0070] The computer-readable storage medium 30 can be a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, or it can be a server storing the computer program 300. The server can send the stored computer program 300 to other devices for execution, or it can run the stored computer program 300 itself.

[0071] This application also provides a control system for air conditioner defrosting, which controls the air conditioner defrosting using the control method of any of the above embodiments. Correspondingly, please refer to... Figure 7 , Figure 7This is a structural block diagram of an embodiment of the air conditioner defrosting control system of this application. In some specific embodiments, the control system 400 includes a control module 41, a temperature acquisition module 42, an adjustment module 43, and an exit module 44. The control module 41 is used to control the refrigerant circulation of the air conditioner to be in the refrigeration cycle, control the indoor fan to reverse, and control the auxiliary heater to turn on; the temperature acquisition module 42 is used to acquire the temperature of the indoor heat exchanger; the adjustment module 43 is used to control the power of the auxiliary heater according to the temperature of the indoor heat exchanger, and control the reverse rotation speed of the indoor fan according to the temperature of the indoor heat exchanger; the exit module 44 is used to control the air conditioner to exit the defrosting mode when the temperature of the outdoor heat exchanger reaches the target temperature.

[0072] In the several embodiments provided in this application, it should be understood that the disclosed methods, devices, and apparatuses can be implemented in other ways. For example, the device and apparatus embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0073] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0074] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0075] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to it, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A method for controlling air conditioner defrosting, characterized in that, The control method includes: The refrigerant circulation of the air conditioner is controlled to be in the refrigeration cycle, the indoor fan is controlled to reverse, and the auxiliary heater is controlled to turn on; The temperature of the indoor heat exchanger is acquired in real time, and the power of the auxiliary heater is controlled according to the temperature of the indoor heat exchanger. The reverse rotation speed of the indoor fan is also controlled according to the temperature of the indoor heat exchanger. Defrosting is completed when the outdoor heat exchanger reaches the target temperature.

2. The control method according to claim 1, characterized in that, Prior to the step of controlling the refrigerant cycle of the air conditioner to be in a refrigeration cycle, the method further includes: Obtain the operating parameters of the air conditioner, and determine whether to start defrosting based on the operating parameters; The operating parameters include one or more of the following: outdoor heat exchanger coil temperature, air conditioner continuous heating duration, outdoor ambient temperature, and outdoor ambient humidity.

3. The control method according to claim 1, characterized in that, The step of controlling the refrigerant circulation of the air conditioner to be in a refrigeration cycle specifically includes: Control the compressor frequency to decrease to the set switching frequency; Control the reversing of the four-way valve; Control the compressor frequency to rise to the rated defrost frequency.

4. The control method according to claim 1, characterized in that, The step of controlling the power of the auxiliary heater based on the temperature of the indoor heat exchanger specifically includes: The higher the temperature of the indoor heat exchanger, the lower the power required to control the auxiliary heater.

5. The control method according to claim 4, characterized in that, The step of controlling the power of the auxiliary heater to be lower as the temperature of the indoor heat exchanger increases specifically includes: A mapping relationship between the temperature range of the indoor heat exchanger and the power of the auxiliary heater is established in advance; The temperature range of the indoor heat exchanger is determined, and the power of the auxiliary heater is controlled to be the power corresponding to the temperature range.

6. The air conditioner defrosting control method according to claim 5, characterized in that, The temperature range includes a normal heating range and an over-temperature protection range. The percentage of output power corresponding to the normal heating range decreases step by step as the temperature of the indoor heat exchanger increases. When the temperature of the indoor heat exchanger is within the over-temperature protection range, the auxiliary heater is controlled to shut down.

7. The control method according to claim 1, characterized in that, The step of controlling the reverse rotation speed of the indoor fan based on the temperature of the indoor heat exchanger specifically includes: The higher the temperature of the indoor heat exchanger, the greater the reverse rotation speed of the indoor fan.

8. The control method according to claim 5, characterized in that, The formula for calculating the reverse rotation speed of the indoor fan is: R_ps = ΔR_ps + (TE - ΔTE) * KP / (R_psmax - R_psmin); where R_ps is the reverse rotation speed of the indoor fan, ΔR_ps is the reverse rotation speed of the indoor fan in the previous cycle, TE is the temperature of the indoor heat exchanger, ΔTE is the temperature of the indoor heat exchanger in the previous cycle, KP is the speed regulation ratio coefficient, R_psmax is the upper limit of the speed, and R_psmin is the lower limit of the speed.

9. The air conditioner defrosting control method according to claim 1, characterized in that, Following the defrosting process after the outdoor heat exchanger reaches the target temperature, the process also includes: The system controls the refrigerant circulation of the air conditioner to switch to heating circulation, controls the auxiliary heater to turn off, controls the indoor fan to stop reversing, and controls the compressor's operating frequency to rise to the target heating frequency.

10. A defrosting control system for an air conditioner, characterized in that, include: The control module is used to control the refrigerant circulation of the air conditioner to be in the refrigeration cycle, control the indoor fan to reverse, and control the auxiliary heater to turn on. Temperature acquisition module, used to acquire the temperature of the indoor heat exchanger; The regulating module is used to control the power of the auxiliary heater according to the temperature of the indoor heat exchanger, and to control the reverse rotation speed of the indoor fan according to the temperature of the indoor heat exchanger. The exit module is used to control the air conditioner to exit the defrost mode when the temperature of the outdoor heat exchanger reaches the target temperature.

11. An air conditioner, characterized in that, The air conditioner controls defrosting using the defrosting control method according to any one of claims 1-9.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the air conditioning defrosting control method according to any one of claims 1-9.

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