Air conditioner, and defrosting control method and defrosting control apparatus therefor, and storage medium

Abstract

An air conditioner, a defrosting control method therefor, a defrosting control apparatus therefor, and a storage medium. The method comprises: when an air conditioner operates in a heating mode for a first set duration, acquiring an outdoor heat exchanger temperature, an outdoor environment temperature and outdoor environment humidity; when determining, on the basis of the outdoor heat exchanger temperature, the outdoor environment temperature and the outdoor environment humidity, that the air conditioner does not satisfy the condition of entering a reversing defrosting mode, determining a non-reversing defrosting mode on the basis of the outdoor environment temperature and the outdoor environment humidity; and performing defrosting control on the air conditioner on the basis of the non-reversing defrosting mode.

Description

Air conditioner, defrost control method, defrost control device and storage medium thereof

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent application No. 2024101500304, filed on February 1, 2024, entitled “AIR CONDITIONER AND DEFROST CONTROL METHOD, DEFROST CONTROL DEVICE AND STORAGE MEDIUM,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the technical field of air conditioning, and in particular to a defrost control method for an air conditioner, a defrost control device for an air conditioner, a computer-readable storage medium, and an air conditioner. Background Art

[0004] When operating in low-temperature heating mode in winter, air conditioners may frost, necessitating defrosting. Existing defrost control methods determine the frost status of the outdoor unit based on the temperature of the outdoor condenser. When the outdoor condenser temperature exceeds a set value, the system enters defrost mode, and when it falls below a certain value, the system exits defrost mode. Furthermore, during defrost operation, the air conditioner is defrosted using a reverse cycle defrosting method, requiring the air conditioner to switch to cooling mode. This can lead to large indoor temperature fluctuations, unusual switching noises from the four-way valve, and unusual thermal expansion and contraction noises, impacting the user experience.

[0005] Public content

[0006] The present disclosure aims to at least partially address one of the technical issues in the related art. To this end, the first objective of the present disclosure is to provide a defrost control method for an air conditioner. When the air conditioner is operating in heating mode, the method determines the non-reversing defrost mode in accordance with different temperature and humidity ranges, and controls the air conditioner accordingly based on the non-reversing defrost mode. This method reduces the frequency of defrosting, minimizes indoor temperature fluctuations, reduces abnormal defrosting noise, extends the duration of continuous heating, and enhances the user's heating experience.

[0007] A second objective of the present disclosure is to provide a defrost control device for an air conditioner.

[0008] A third object of the present disclosure is to provide a computer-readable storage medium.

[0009] A fourth object of the present disclosure is to provide an air conditioner.

[0010] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present disclosure proposes a defrost control method for an air conditioner, comprising: obtaining the outdoor heat exchanger temperature, the outdoor ambient temperature and the outdoor ambient humidity when the air conditioner is running in heating mode for a first set period of time; when it is determined that the air conditioner does not meet the conditions for entering the reversing defrost mode based on the outdoor heat exchanger temperature, the outdoor ambient temperature and the outdoor ambient humidity, determining the non-reversing defrost mode based on the outdoor ambient temperature and the outdoor ambient humidity; and performing defrost control on the air conditioner according to the non-reversing defrost mode.

[0011] According to the defrost control method for an air conditioner according to an embodiment of the present disclosure, when the air conditioner is operating in heating mode for a first set duration, the outdoor heat exchanger temperature, outdoor ambient temperature, and outdoor ambient humidity are obtained. If it is determined based on the outdoor heat exchanger temperature, outdoor ambient temperature, and outdoor ambient humidity that the air conditioner does not meet the conditions for entering the reversing defrost mode, a non-reversing defrost mode is determined based on the outdoor ambient temperature and outdoor ambient humidity, and defrost control is performed on the air conditioner based on the non-reversing defrost mode. Thus, when the air conditioner is operating in heating mode, the method determines the non-reversing defrost mode according to different temperature and humidity ranges, and performs a corresponding defrost control on the air conditioner based on the non-reversing defrost mode, thereby reducing the frequency of defrosting of the air conditioner, reducing indoor temperature fluctuations, reducing abnormal defrosting noises, extending the continuous heating time, and improving the user's heating experience.

[0012] In addition, the defrost control method for an air conditioner according to the above embodiment of the present disclosure may also have the following additional technical features:

[0013] According to some embodiments of the present disclosure, the conditions for entering the reversing defrost mode include any one of the following: the outdoor heat exchanger temperature is less than the first heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the second heat exchanger temperature threshold and lasts for a first preset time; the indoor ambient temperature is less than the first indoor temperature threshold and the sum of the indoor ambient temperature and the outdoor ambient temperature is less than a first preset value; the outdoor ambient humidity is greater than or equal to the preset humidity threshold, wherein the outdoor ambient humidity threshold is determined based on the temperature range in which the outdoor ambient temperature is located; wherein the second heat exchanger temperature threshold is greater than the first heat exchanger temperature threshold.

[0014] According to some embodiments of the present disclosure, the conditions for entering the reversing defrost mode include any one of the following: the corrected outdoor heat exchanger temperature is less than the first compensation temperature threshold; within a first duration, it operates in accordance with the first non-reversing defrost mode or the second non-reversing defrost mode, and does not enter the over-reversing defrost mode; within a second duration, it operates in accordance with the third non-reversing defrost mode, and does not enter the over-reversing defrost mode; wherein the corrected outdoor heat exchanger temperature is determined based on the initial outdoor heat exchanger temperature, the initial outdoor ambient temperature, the current outdoor heat exchanger temperature and the current outdoor ambient temperature within a preset time interval, and the first duration is less than the second duration.

[0015] According to some embodiments of the present disclosure, a non-reversing defrost mode is determined based on the outdoor ambient temperature and the outdoor ambient humidity, including: determining a humidity interval threshold corresponding to the outdoor ambient humidity based on the temperature interval of the outdoor ambient temperature; when the outdoor ambient humidity is within the corresponding humidity interval threshold, determining the non-reversing defrost mode to be the first non-reversing defrost mode or the second non-reversing defrost mode; when the outdoor ambient humidity is not within the corresponding humidity interval threshold, determining the non-reversing defrost mode to be the third non-reversing defrost mode.

[0016] According to some embodiments of the present disclosure, the above-mentioned defrost control method of the air conditioner also includes: when the outdoor ambient humidity is on an upward trend, the defrost mode is judged based on the corresponding humidity interval threshold plus a preset compensation value; when the outdoor ambient humidity is on a downward trend, the defrost mode is judged based on the corresponding humidity interval threshold minus the preset compensation value.

[0017] According to some embodiments of the present disclosure, the above-mentioned defrost control method of the air conditioner also includes: when judging the defrost mode according to the corresponding humidity interval threshold after compensation, if it is determined according to the outdoor ambient humidity to switch from the reversing defrost mode to the non-reversing defrost mode, the defrost mode is kept unchanged as the reversing defrost mode; if it is determined according to the outdoor ambient humidity to switch from the non-reversing defrost mode to the reversing defrost mode, and the air conditioner is in the heating operation stage, the air conditioner is controlled to operate in the reversing defrost mode; if it is determined according to the outdoor ambient humidity to switch from the non-reversing defrost mode to the reversing defrost mode, and the air conditioner executes the non-reversing defrost mode, the defrost mode is re-judged after the defrost is completed.

[0018] According to some embodiments of the present disclosure, the non-reversing defrost mode is determined to be the second non-reversing defrost mode, including: the corrected outdoor heat exchanger temperature is less than the second compensation temperature threshold; the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold and lasts for a second preset time; the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the second preset value; the heating operation time of the air conditioner reaches the second set duration; the last time it was operated in the first non-reversing defrost mode, or it was operated in the first non-reversing defrost mode for a first preset number of times in a row; wherein, the second compensation temperature threshold is greater than the first compensation temperature threshold, the fourth heat exchanger temperature threshold is greater than the third heat exchanger temperature threshold, and the second set duration is greater than the first set duration.

[0019] According to some embodiments of the present disclosure, the non-reversing defrost mode is determined to be the first non-reversing defrost mode, including: the corrected outdoor heat exchanger temperature is less than the third compensation temperature threshold; the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold and lasts for a third preset time; the heating operation time of the air conditioner reaches a third set duration; wherein, the third compensation temperature threshold is greater than the second compensation temperature threshold, the third preset time is greater than the second preset time, and the third set duration is greater than the first set duration.

[0020] According to some embodiments of the present disclosure, the non-reversing defrost mode is determined to be the third non-reversing defrost mode, including: the corrected outdoor heat exchanger temperature is less than the fourth compensation temperature threshold; the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold and lasts for a fourth preset time; the heating operation time of the air conditioner reaches a fourth set duration; wherein, the fourth compensation temperature threshold is greater than the third compensation temperature threshold, the fourth preset time is greater than the third preset time, and the fourth set duration is greater than the first set duration.

[0021] According to some embodiments of the present disclosure, the air conditioner is defrosted according to the second non-reversing defrost mode, including: controlling the four-way valve not to reverse, the compressor to operate at a first operating frequency, the outdoor fan to stop, the electronic expansion valve to a first preset opening, and the speed of the indoor fan to decrease according to a preset rate.

[0022] According to some embodiments of the present disclosure, the air conditioner is defrosted according to a first non-reversing defrost mode, including: controlling the four-way valve not to reverse, the compressor to operate at a second operating frequency, the outdoor fan to stop, the electronic expansion valve to a second preset opening, and the speed of the indoor fan to remain unchanged; wherein the second operating frequency is less than the first operating frequency.

[0023] According to some embodiments of the present disclosure, the air conditioner is defrosted according to a third non-reversing defrost mode, including: controlling the four-way valve not to reverse, the compressor to operate at a third operating frequency, the outdoor fan to stop, the electronic expansion valve to a third preset opening, and the speed of the indoor fan to remain unchanged; wherein the third operating frequency is less than the first operating frequency.

[0024] To achieve the above-mentioned purpose, the second aspect embodiment of the present disclosure proposes a defrost control device for an air conditioner, including: an acquisition module, used to obtain the outdoor heat exchanger temperature, outdoor ambient temperature and outdoor ambient humidity when the air conditioner is running in heating mode for a first set period of time; a determination module, used to determine the non-reversing defrost mode according to the outdoor ambient temperature and the outdoor ambient humidity when it is determined that the air conditioner does not meet the conditions for entering the reversing defrost mode according to the outdoor heat exchanger temperature, the outdoor ambient temperature and the outdoor ambient humidity; and a control module, used to perform defrost control on the air conditioner according to the non-reversing defrost mode.

[0025] According to the defrost control device for an air conditioner according to the embodiment of the present disclosure, when the air conditioner is operating in heating mode for a first set duration, the acquisition module acquires the outdoor heat exchanger temperature, the outdoor ambient temperature, and the outdoor ambient humidity. If the determination module determines that the air conditioner does not meet the conditions for entering the reversing defrost mode based on the outdoor heat exchanger temperature, the outdoor ambient temperature, and the outdoor ambient humidity, the determination module determines the non-reversing defrost mode based on the outdoor ambient temperature and the outdoor ambient humidity. The control module then performs defrost control on the air conditioner according to the non-reversing defrost mode. Thus, when the air conditioner is operating in heating mode, the device determines the non-reversing defrost mode according to different temperature and humidity ranges, and performs a corresponding defrost control method on the air conditioner according to the non-reversing defrost mode, thereby reducing the frequency of defrosting of the air conditioner, reducing indoor temperature fluctuations, reducing abnormal defrosting noises, extending the continuous heating time, and improving the user's heating experience.

[0026] To achieve the above objectives, the third embodiment of the present disclosure proposes a computer-readable storage medium on which a defrost control program for an air conditioner is stored. When the defrost control program for the air conditioner is executed by a processor, the above-mentioned defrost control method for the air conditioner is implemented.

[0027] The computer-readable storage medium of the embodiment of the present disclosure can reduce the defrosting frequency of the air conditioner, reduce indoor temperature fluctuations, reduce abnormal defrosting sounds, extend the continuous heating time, and improve the user's heating experience by executing the above-mentioned defrosting control method of the air conditioner.

[0028] To achieve the above-mentioned purpose, the fourth aspect embodiment of the present disclosure proposes an air conditioner, including a memory, a processor, and a defrost control program for the air conditioner stored in the memory and runnable on the processor. When the processor executes the defrost control program for the air conditioner, the above-mentioned defrost control method for the air conditioner is implemented.

[0029] According to the air conditioner of the embodiment of the present disclosure, by executing the above-mentioned defrost control method of the air conditioner, the defrost frequency of the air conditioner can be reduced, the indoor temperature fluctuation can be reduced, the abnormal defrost sound can be reduced, the continuous heating time can be extended, and the user's heating experience can be improved.

[0030] Additional aspects and advantages of the present disclosure will be given in part in the description below and in part will be obvious from the description below, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a flow chart of a defrost control method for an air conditioner according to some embodiments of the present disclosure;

[0032] FIG2 is a schematic diagram of defrost mode division corresponding to outdoor ambient humidity according to some embodiments of the present disclosure;

[0033] FIG3 is a schematic diagram of outdoor environment humidity fluctuation compensation according to some embodiments of the present disclosure;

[0034] FIG4 is a flow chart of a defrost control method for an air conditioner according to some embodiments of the present disclosure;

[0035] FIG5 is a block diagram of a defrost control device for an air conditioner according to some embodiments of the present disclosure;

[0036] FIG6 is a block diagram of an air conditioner according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0037] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0038] The following describes a defrost control method for an air conditioner, a defrost control device for an air conditioner, a computer-readable storage medium, and an air conditioner according to embodiments of the present disclosure with reference to the accompanying drawings.

[0039] FIG1 is a flowchart of a defrost control method for an air conditioner according to some embodiments of the present disclosure.

[0040] As shown in FIG1 , the defrost control method for an air conditioner according to an embodiment of the present disclosure may include the following steps:

[0041] S1. When the air conditioner is running in heating mode for the first set time, obtain the outdoor heat exchanger temperature, outdoor ambient temperature and outdoor ambient humidity. The first set time can be calibrated according to actual conditions. For example, the first set time can be the time for the air conditioner to run in heating mode stably, or the time for the temperature set by the user to be reached.

[0042] Specifically, when the air conditioner is operating in heating mode and the operating time reaches a first set duration, the outdoor heat exchanger temperature is obtained via a temperature sensor provided on the outdoor heat exchanger. There are various ways to obtain the outdoor ambient temperature and humidity, such as detecting the outdoor ambient temperature via a temperature sensor provided on the air conditioner and collecting the outdoor ambient humidity via a humidity sensor provided on the air conditioner; or obtaining the outdoor ambient temperature and humidity via a temperature and humidity sensor provided on the air conditioner; or the air conditioner communicating with a device capable of obtaining the outdoor ambient temperature and humidity to obtain the outdoor ambient temperature and humidity.

[0043] S2, when it is determined according to the outdoor heat exchanger temperature, the outdoor ambient temperature and the outdoor ambient humidity that the air conditioner does not meet the conditions for entering the reversing defrost mode, determining the non-reversing defrost mode according to the outdoor ambient temperature and the outdoor ambient humidity.

[0044] Specifically, under normal circumstances, reversing defrost means that the air conditioner is prone to frost and the frost is thick. For example, the outdoor heat exchanger temperature is very low, or the outdoor ambient temperature is very low, or the outdoor ambient humidity is greater than the humidity threshold corresponding to the temperature range of the outdoor ambient temperature, or it is considered that the air conditioner needs to enter the reversing mode. When the outdoor heat exchanger temperature, the outdoor ambient temperature and the outdoor ambient humidity do not meet the reversing defrost conditions, the air conditioner is determined to enter the reversing defrost mode, and then the non-reversing defrost mode is determined based on the outdoor ambient temperature and the outdoor ambient humidity. For example, the temperature range is determined based on the outdoor ambient temperature, and the corresponding humidity range is obtained based on the temperature range of the outdoor ambient temperature. If the outdoor ambient humidity is within the humidity range, the fast non-reversing defrost mode and the long-term non-reversing defrost mode can be entered; if the outdoor ambient humidity is not within the humidity range, it means that the frost is thin, and the fast non-reversing defrost mode can be entered.

[0045] S3, performing defrost control on the air conditioner according to the non-reversing defrost mode.

[0046] Specifically, after determining the non-reversing defrost mode that the air conditioner needs to execute, the air conditioner is defrosted according to the non-reversing defrost mode. Different non-reversing defrost modes correspond to different operating frequencies of the air conditioner's compressor, different control strategies for the indoor fan, and different control strategies for the opening of the electronic expansion valve. By adopting different reversing defrost modes, it is possible to achieve faster defrosting, reduce the frequency of defrosting, reduce indoor temperature fluctuations, reduce abnormal defrosting noise, extend the continuous heating time, broaden the scope of application of the non-reversing defrost mode control method, and enhance the user's heating experience while ensuring air conditioner performance and user comfort.

[0047] The defrost control method of the air conditioner according to the embodiment of the present disclosure is described in detail below.

[0048] In some embodiments of the present disclosure, the conditions for entering the reversing defrost mode may include any one of the following: the outdoor heat exchanger temperature is less than the first heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the second heat exchanger temperature threshold and lasts for a first preset time; the indoor ambient temperature is less than the first indoor temperature threshold and the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the first preset value; the outdoor ambient humidity is greater than or equal to the preset humidity threshold, wherein the outdoor ambient humidity threshold is determined based on the temperature range in which the outdoor ambient temperature is located; wherein the second heat exchanger temperature threshold is greater than the first heat exchanger temperature threshold, and the first preset time, the first indoor temperature threshold, the first preset value and the preset humidity threshold can be calibrated according to actual conditions.

[0049] Specifically, different outdoor ambient temperature intervals correspond to different outdoor ambient humidity thresholds. After obtaining the outdoor ambient temperature, the temperature interval of the current outdoor ambient temperature is determined based on the outdoor ambient temperature, thereby determining the corresponding outdoor ambient humidity threshold. For example, when T4set1≤T4<T4set2, the corresponding outdoor ambient humidity threshold is RHset2; when T4set2≤T4<T4set3, the corresponding outdoor ambient humidity threshold is aT4+b; when T4set3≤T4<T4set4, the corresponding outdoor ambient humidity threshold is RHset3; when T4set4≤T4<T4set5, the corresponding outdoor ambient humidity threshold is cT4+d; when T4≥T4set5, the corresponding outdoor ambient humidity threshold is RHset1, where a, b, c, and d are constants, the outdoor ambient temperatures are in the order of T4set1<T4set2<T4set3<T4set4<T4set5, and the outdoor ambient humidity thresholds are in the order of RHset3<RHset2<RHset1. Since the degree of frost formation of air conditioners varies at different outdoor ambient temperatures, different outdoor ambient temperature ranges are divided, different outdoor ambient humidity thresholds are set, the judgment of outdoor ambient humidity is increased, and differentiated defrost control strategies are implemented. This can reduce the defrost frequency of the air conditioner, reduce indoor temperature fluctuations, and operate in non-reversing defrost mode when the air conditioner meets the non-reversing defrost mode. There is no need to switch the four-way valve reversing direction, which reduces abnormal defrosting noise, extends the heating time, and improves the user's heating experience.

[0050] When any of the following conditions is met, it indicates that the air conditioner enters the reversing defrost mode: the outdoor heat exchanger temperature is less than the first heat exchanger temperature threshold (such as T3set1), or the outdoor heat exchanger temperature is less than the second heat exchanger temperature threshold (such as T3set2) and lasts for a first preset time (such as t2), or the indoor ambient temperature is less than the first indoor temperature threshold (such as T1set1) and the sum of the indoor ambient temperature and the outdoor ambient temperature is less than a first preset value (such as Ts). In other words, when any of the above conditions is met, it indicates that the air conditioner is in a condition where frost is very likely to form. In order to ensure the normal operation of the air conditioner and prevent thick frost on the surface of the outdoor heat exchanger, which will affect the service life of the air conditioner and reduce the user's heating experience, the air conditioner is directly controlled to enter the reversing defrost mode, that is, the compressor is controlled to stop running, and the four-way valve is controlled to reverse, and then the compressor is started to run and the defrost strategy is executed.

[0051] In some embodiments of the present disclosure, the conditions for entering the reversing defrost mode may also include any one of the following: the corrected outdoor heat exchanger temperature is less than the first compensation temperature threshold; within the first duration, it operates in accordance with the first non-reversing defrost mode or the second non-reversing defrost mode, and does not enter the over-reversing defrost mode; within the second duration, it operates in accordance with the third non-reversing defrost mode, and does not enter the over-reversing defrost mode; wherein, the corrected outdoor heat exchanger temperature is determined based on the initial outdoor heat exchanger temperature, the initial outdoor ambient temperature, the current outdoor heat exchanger temperature and the current outdoor ambient temperature within a preset time interval, the first duration is less than the second duration, and the first duration and the second duration can be calibrated according to actual conditions.

[0052] Specifically, because changes in the outdoor ambient temperature can affect the outdoor heat exchanger temperature, the outdoor heat exchanger temperature can be corrected to improve the accuracy of defrost mode selection. When the air conditioner is turned on for heating within a specific time zone, the initial outdoor heat exchanger temperature (e.g., T30), the initial outdoor ambient temperature (e.g., T40), the current outdoor heat exchanger temperature (e.g., T3), and the current outdoor ambient temperature (e.g., T4) are detected and recorded. The corrected outdoor heat exchanger temperature ΔT3 can be calculated using the formula ΔT3 = (T3 - T30) - M * (T4 - T40), where M is a constant less than or equal to 1.

[0053] Conditions for determining whether the air conditioner enters the reversing defrost mode may also include any of the following: the corrected outdoor heat exchanger temperature is less than a first compensation temperature threshold (e.g., ΔT3set1); or, for a first duration (e.g., Bypasstime1), the air conditioner continuously operates in the first non-reversing defrost mode or the second non-reversing defrost mode without entering the reversing defrost mode; or, for a second duration (e.g., Bypasstime2), the air conditioner continuously operates in the third non-reversing defrost mode without entering the reversing defrost mode. When any of the above conditions is met, the air conditioner is controlled to execute the reversing defrost mode to ensure that the surface of the outdoor heat exchanger is frost-free.

[0054] It should be noted that the first duration and the second duration are counted after the air conditioner is turned on for heating and the compressor starts running, and are reset only when the air conditioner enters a reversing defrost mode.

[0055] In some embodiments of the present disclosure, a non-reversing defrost mode is determined based on the outdoor ambient temperature and the outdoor ambient humidity, including: determining a humidity interval threshold corresponding to the outdoor ambient humidity based on the temperature interval of the outdoor ambient temperature; when the outdoor ambient humidity is within the corresponding humidity interval threshold, determining the non-reversing defrost mode to be the first non-reversing defrost mode or the second non-reversing defrost mode; when the outdoor ambient humidity is not within the corresponding humidity interval threshold, determining the non-reversing defrost mode to be the third non-reversing defrost mode.

[0056] Specifically, after obtaining the outdoor ambient temperature, the humidity interval threshold corresponding to the outdoor ambient humidity is determined according to the temperature range of the outdoor ambient temperature. For example, as shown in Figure 2, when T4set1≤T4<T4set2, the corresponding humidity interval threshold is RHset5≤RH<RHset2; when T4set2≤T4<T4set3, the corresponding humidity interval threshold is eT4+f≤RH<aT4+b; when T4set3≤T4<T4set4, the corresponding humidity interval threshold is RHset6≤RH<RHset3; when T4set4≤T4<T4set5, the corresponding humidity interval threshold is RHset6≤RH<RHset3; The humidity interval threshold is gT4+h≤RH<cT4+d. When T4≥T4set5, the corresponding humidity interval threshold is RHset4≤RH<RHset1, where a, b, c, d, e, f, g, and h are constants. The outdoor humidity thresholds are in the following relationship: RHset6<RHset5<RHset4<RHset3<RHset2<RHset1. When the outdoor humidity is within the corresponding humidity interval threshold, the air conditioner enters the first non-reversing defrost mode or the second non-reversing defrost mode. When the outdoor humidity is not within the corresponding humidity interval threshold, the air conditioner enters the third non-reversing defrost mode. Because the air conditioner's frost formation speed varies when the outdoor humidity is within a certain range, the first and second non-reversing defrost modes can be coupled to avoid multiple runs of the first non-reversing defrost mode followed by a direct entry into the reversing defrost mode, thus achieving long-term continuous heating. When the outdoor humidity is lower than a certain value, the air conditioner will frost less and more slowly. The frost layer can be handled by quickly defrosting in the third non-reversing defrost mode, thereby achieving smaller temperature fluctuations and continuous heating time.

[0057] In some embodiments of the present disclosure, the air conditioner defrost control method further includes: when the outdoor humidity is on an upward trend, determining the defrost mode based on a corresponding humidity range threshold plus a preset compensation value; and when the outdoor humidity is on a downward trend, determining the defrost mode based on a corresponding humidity range threshold minus the preset compensation value. The preset compensation value may be calibrated based on actual conditions.

[0058] Specifically, when the air conditioner is operating in heating mode, the outdoor humidity is detected in real time. Based on the changing trend of the outdoor humidity, the humidity interval threshold is compensated. For example, as shown in FIG3 , if the outdoor humidity is detected to be rising compared to the previous moment, the defrost mode is determined by adding a preset compensation value ΔRH to the corresponding humidity interval threshold RH. If the outdoor humidity is detected to be falling compared to the previous moment, the defrost mode is determined by subtracting the preset compensation value ΔRH from the corresponding humidity interval threshold RH. This avoids inaccurate selection of the control method for the non-reversing defrost mode when the outdoor humidity critical point fluctuates.

[0059] In some embodiments of the present disclosure, the above-mentioned defrost control method of the air conditioner also includes: when judging the defrost mode according to the corresponding humidity interval threshold after compensation, if it is determined according to the outdoor ambient humidity that the defrost mode is switched from the reversing defrost mode to the non-reversing defrost mode, the defrost mode is kept unchanged as the reversing defrost mode; if it is determined according to the outdoor ambient humidity that the defrost mode is switched from the non-reversing defrost mode to the reversing defrost mode, and the air conditioner is in the heating operation stage, the air conditioner is controlled to operate in the reversing defrost mode; if it is determined according to the outdoor ambient humidity that the defrost mode is switched from the non-reversing defrost mode to the reversing defrost mode, and the air conditioner executes the non-reversing defrost mode, the defrost mode is re-judged after the defrost is completed.

[0060] Specifically, since the outdoor humidity changes during the operation of the air conditioner, the defrost mode also changes. Therefore, the defrost mode needs to be determined based on the corresponding humidity interval threshold after compensation. When determining the defrost mode based on the corresponding humidity interval threshold after compensation, if the air conditioner switches from reversing defrost mode to non-reversing defrost mode, the air conditioner's defrost mode remains unchanged at reversing defrost mode. If the air conditioner switches from non-reversing defrost mode to reversing defrost mode and the air conditioner is in heating operation, the air conditioner is controlled to operate in reversing defrost mode. If the air conditioner switches from non-reversing defrost mode to reversing defrost mode and the air conditioner is in non-reversing defrost mode, the defrost mode is re-determined after defrosting is complete. This can reduce the frequency of defrosting and improve the user's heating experience.

[0061] In some embodiments of the present disclosure, the non-reversing defrost mode is determined to be the second non-reversing defrost mode, including: the corrected outdoor heat exchanger temperature is less than the second compensation temperature threshold; the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold and lasts for a second preset time; the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the second preset value; the heating operation time of the air conditioner reaches the second set duration; the last time it was operated in the first non-reversing defrost mode, or it was operated in the first non-reversing defrost mode for a first preset number of times in a row; wherein, the second compensation temperature threshold is greater than the first compensation temperature threshold, the fourth heat exchanger temperature threshold is greater than the third heat exchanger temperature threshold, the second set time is greater than the first set time, and the second preset value can be calibrated according to actual conditions.

[0062] Specifically, when the outdoor ambient humidity is within the corresponding humidity range threshold, the first non-reversing defrost mode or the second non-reversing defrost mode is entered. If the corrected outdoor heat exchanger temperature ΔT3 is less than the second compensation temperature threshold (such as ΔT3set2), and the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold (such as T3set3), and the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold (such as T3set4) and lasts for a second preset time (such as t3), and the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the second preset value (such as α), it is detected that the heating operation time of the air conditioner has reached the second set time (such as Tset2), and the air conditioner was last operated in the first non-reversing defrost mode, or the air conditioner has been operated in the first non-reversing defrost mode for a first preset number of times (such as N times), indicating that the frost layer on the outdoor heat exchanger is thick and the defrost time is long, the air conditioner is controlled to enter the second non-reversing defrost mode, reduce the abnormal defrosting sound, extend the continuous heating time, and improve the user's heating experience.

[0063] In some embodiments of the present disclosure, the non-reversing defrost mode is determined to be the first non-reversing defrost mode, including: the corrected outdoor heat exchanger temperature is less than the third compensation temperature threshold; the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold and lasts for a third preset time; the heating operation time of the air conditioner reaches a third set duration; wherein, the third compensation temperature threshold is greater than the second compensation temperature threshold, the third preset time is greater than the second preset time, and the third set duration is greater than the first set duration.

[0064] Specifically, when the outdoor ambient humidity is within the corresponding humidity range threshold, the first non-reversing defrost mode or the second non-reversing defrost mode is entered. If the corrected outdoor heat exchanger temperature ΔT3 is less than the third compensation temperature threshold (such as ΔT3set3), and the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold (such as T3set3), and the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold (such as T3set4) and lasts for a third preset time (such as t4), and the heating operation time of the air conditioner reaches the third set time (such as Tset3), indicating that the frost layer on the outdoor heat exchanger is thin and the defrost time is short, the air conditioner is controlled to enter the first non-reversing defrost mode, reduce the abnormal sound of defrosting, extend the continuous heating time, and improve the user's heating experience.

[0065] In some embodiments of the present disclosure, the non-reversing defrost mode is determined to be the third non-reversing defrost mode, including: the corrected outdoor heat exchanger temperature is less than the fourth compensation temperature threshold; the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold and lasts for a fourth preset time; the heating operation time of the air conditioner reaches a fourth set duration; wherein, the fourth compensation temperature threshold is greater than the third compensation temperature threshold, the fourth preset time is greater than the third preset time, and the fourth set duration is greater than the first set duration.

[0066] Specifically, when the outdoor ambient humidity is not within the corresponding humidity interval threshold, if the corrected outdoor heat exchanger temperature ΔT3 is less than the fourth compensation temperature threshold (such as ΔT3set4), and the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold (such as T3set3), it is detected that the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold (such as T3set4) and lasts for a fourth preset time (such as t5), and the heating operation time of the air conditioner reaches the fourth set time (such as Tset4), indicating that there is little frost and the frost forms slowly. At this time, the air conditioner is controlled to enter the third non-reversing defrost mode. The frost layer can be quickly processed only through the third non-reversing defrost mode, and smaller temperature fluctuations and continuous heating time can be achieved.

[0067] It should be noted that, except for the first duration and the second duration, the remaining times are cleared after the current determination of entering the reversing defrost mode or the determination of ending the non-reversing defrost mode.

[0068] In some embodiments of the present disclosure, defrosting control of an air conditioner according to a second non-reversing defrost mode includes: controlling the four-way valve to be non-reversing, operating the compressor at a first operating frequency, stopping the outdoor fan, setting the electronic expansion valve to a first preset opening, and reducing the speed of the indoor fan at a preset rate. The first preset opening and preset rate can be calibrated based on actual conditions.

[0069] Specifically, when it is determined that the non-reversing defrost mode of the air conditioner is the second non-reversing defrost mode, the four-way valve is controlled not to reverse, the compressor operates at the first operating frequency, the outdoor fan is stopped, the electronic expansion valve is at the first preset opening, and the speed of the indoor fan is reduced according to the preset rate, so that the air conditioner can be defrosted. Among them, the second non-reversing defrost mode is aimed at the situation where the air conditioner has thicker frost (compared with the first non-reversing defrost mode, the frost is thicker). This mode has a longer defrost time, which can reduce the defrost frequency of the air conditioner, reduce indoor ambient temperature fluctuations, reduce defrost noise, and improve the user's heating experience.

[0070] In some embodiments of the present disclosure, the air conditioner is defrosted according to a first non-reversing defrost mode, including: controlling the four-way valve not to reverse, the compressor to operate at a second operating frequency, the outdoor fan to stop, the electronic expansion valve to a second preset opening, and the speed of the indoor fan to remain unchanged; wherein the second operating frequency is less than the first operating frequency, and the second preset opening can be calibrated according to actual conditions.

[0071] Specifically, when it is determined that the non-reversing defrost mode of the air conditioner is the first non-reversing defrost mode, the four-way valve is controlled not to reverse, the compressor operates at the second operating frequency, the outdoor fan is stopped, the electronic expansion valve is at the second preset opening, and the speed of the indoor fan remains unchanged, so as to quickly defrost. Among them, the first non-reversing defrost mode is aimed at the situation where thin frost appears on the air conditioner. The defrost process in this mode is shorter, which can reduce indoor ambient temperature fluctuations, reduce abnormal defrosting noises, and improve the user's heating experience.

[0072] In some embodiments of the present disclosure, the air conditioner is defrosted according to a third non-reversing defrost mode, including: controlling the four-way valve not to reverse, the compressor to operate at a third operating frequency, the outdoor fan to stop, the electronic expansion valve to a third preset opening, and the speed of the indoor fan to remain unchanged; wherein, the third operating frequency is less than the first operating frequency, and the third preset opening can be calibrated according to actual conditions.

[0073] Specifically, when it is determined that the non-reversing defrost mode of the air conditioner is the third non-reversing defrost mode, the four-way valve is controlled not to reverse, the compressor operates at the third operating frequency, the outdoor fan is stopped, the electronic expansion valve is at the third preset opening, and the speed of the indoor fan remains unchanged, so as to quickly defrost. The defrosting process in this mode is shorter. This mode is similar to the first non-reversing defrost mode. The difference is that after entering this mode, some judgment conditions change. At the same time, the speed of the indoor fan, the operating frequency of the compressor, the opening of the electronic expansion valve and other values ​​are also adjusted accordingly, which can reduce the defrosting frequency of the air conditioner, achieve smaller temperature fluctuations and continuous heating time, reduce abnormal defrosting noise, and improve the user's heating experience.

[0074] As a specific example, as shown in FIG4 , the defrost control method of the air conditioner disclosed in the present invention may include the following steps:

[0075] S101, the air conditioner is turned on for heating.

[0076] S102: The air conditioner operates in heating mode for a first set time.

[0077] S103: Determine whether the air conditioner meets the conditions for entering the reversing defrost mode based on the outdoor heat exchanger temperature T3, the outdoor ambient temperature T4, and the outdoor ambient humidity RH. If yes, execute step S104; if not, execute step S105.

[0078] S104, after controlling the compressor to stop, the direction of the four-way valve is switched, and then the compressor is started again to control the air conditioner to reverse and defrost.

[0079] S105: Determine whether the non-reversing defrost mode is the first non-reversing defrost mode or the second non-reversing defrost mode according to the outdoor ambient temperature T4 and the outdoor ambient humidity RH. If yes, execute step S108; if not, execute step S106.

[0080] S106: The non-reversing defrost mode is the third non-reversing defrost mode.

[0081] S107, controlling the four-way valve not to reverse, the compressor to operate at a third operating frequency, the outdoor fan to stop, the electronic expansion valve to a third preset opening, and the speed of the indoor fan to remain unchanged.

[0082] S108, determining whether the non-reversing defrost mode is the first non-reversing defrost mode. If yes, proceed to step S109; if not, proceed to step S110.

[0083] S109, controlling the four-way valve not to reverse, the compressor to operate at the second operating frequency, the outdoor fan to stop, the electronic expansion valve to the second preset opening, and the speed of the indoor fan to remain unchanged.

[0084] S110, the non-reversing defrost mode is the second non-reversing defrost mode.

[0085] S111 , controlling the four-way valve not to be reversed, the compressor to operate at a first operating frequency, the outdoor fan to be stopped, the electronic expansion valve to be at a first preset opening, and the speed of the indoor fan to be reduced according to a preset rate.

[0086] It should be noted that the specific numerical values ​​mentioned above are only used as examples to illustrate the implementation of the present disclosure in detail and should not be understood as limiting the present disclosure. In other examples, implementation methods, or embodiments, other numerical values ​​can be selected according to the present disclosure and are not specifically limited here.

[0087] Therefore, the present invention is based on increasing the outdoor environmental humidity threshold judgment when the air conditioner is heating and defrosting, and implementing different defrost control strategies according to different temperature and humidity ranges. It can reduce the defrost frequency of the air conditioner, reduce indoor environmental temperature fluctuations, reduce defrost noises, extend the continuous heating time, and broaden the scope of application of the non-reversing defrost control method, thereby improving the user's heating experience.

[0088] In summary, according to the defrost control method for an air conditioner according to the embodiment of the present disclosure, when the air conditioner is operating in heating mode for a first set time, the outdoor heat exchanger temperature, outdoor ambient temperature, and outdoor ambient humidity are obtained. If it is determined that the air conditioner does not meet the conditions for entering the reversing defrost mode based on the outdoor heat exchanger temperature, outdoor ambient temperature, and outdoor ambient humidity, a non-reversing defrost mode is determined based on the outdoor ambient temperature and outdoor ambient humidity, and the air conditioner is defrosted according to the non-reversing defrost mode. Thus, when the air conditioner is operating in heating mode, the method determines the non-reversing defrost mode according to different temperature and humidity ranges, and performs a corresponding defrost control method on the air conditioner according to the non-reversing defrost mode, thereby reducing the frequency of defrosting of the air conditioner, reducing indoor temperature fluctuations, reducing abnormal defrosting noises, extending the continuous heating time, and improving the user's heating experience.

[0089] Corresponding to the above embodiments, the present disclosure also proposes a defrost control device for an air conditioner.

[0090] As shown in FIG. 5 , the defrost control device 100 for an air conditioner according to an embodiment of the present disclosure may include: an acquisition module 110 , a determination module 120 , and a control module 130 .

[0091] The acquisition module 110 is configured to acquire the outdoor heat exchanger temperature, the outdoor ambient temperature, and the outdoor ambient humidity when the air conditioner is operating in heating mode for a first set duration. The determination module 120 is configured to determine the non-reversing defrost mode based on the outdoor ambient temperature and humidity if the air conditioner determines, based on the outdoor heat exchanger temperature, the outdoor ambient temperature, and the outdoor ambient humidity, that the air conditioner does not meet the conditions for entering the reversing defrost mode. The control module 130 is configured to control the defrost of the air conditioner in accordance with the non-reversing defrost mode.

[0092] In some embodiments of the present disclosure, the conditions for entering the reversing defrost mode include any one of the following: the outdoor heat exchanger temperature is less than the first heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the second heat exchanger temperature threshold and lasts for a first preset time; the indoor ambient temperature is less than the first indoor temperature threshold and the sum of the indoor ambient temperature and the outdoor ambient temperature is less than a first preset value; the outdoor ambient humidity is greater than or equal to the preset humidity threshold, wherein the determination module 120 determines the outdoor ambient humidity threshold based on the temperature range of the outdoor ambient temperature; wherein the second heat exchanger temperature threshold is greater than the first heat exchanger temperature threshold.

[0093] In some embodiments of the present disclosure, the conditions for entering the reversing defrost mode also include any one of the following: the corrected outdoor heat exchanger temperature is less than the first compensation temperature threshold; within the first duration, it operates in accordance with the first non-reversing defrost mode or the second non-reversing defrost mode, and does not enter the over-reversing defrost mode; within the second duration, it operates in accordance with the third non-reversing defrost mode, and does not enter the over-reversing defrost mode; wherein the corrected outdoor heat exchanger temperature is determined based on the initial outdoor heat exchanger temperature, the initial outdoor ambient temperature, the current outdoor heat exchanger temperature and the current outdoor ambient temperature within a preset time interval, and the first duration is less than the second duration.

[0094] In some embodiments of the present disclosure, the determination module 120 determines the non-reversing defrost mode based on the outdoor ambient temperature and the outdoor ambient humidity, and is specifically used to: determine the humidity interval threshold corresponding to the outdoor ambient humidity based on the temperature interval of the outdoor ambient temperature; when the outdoor ambient humidity is within the corresponding humidity interval threshold, determine the non-reversing defrost mode as the first non-reversing defrost mode or the second non-reversing defrost mode; when the outdoor ambient humidity is not within the corresponding humidity interval threshold, determine the non-reversing defrost mode as the third non-reversing defrost mode.

[0095] In some embodiments of the present disclosure, the determination module 120 is also used to determine the defrost mode based on the corresponding humidity interval threshold plus a preset compensation value when the outdoor ambient humidity is on an upward trend; and to determine the defrost mode based on the corresponding humidity interval threshold minus the preset compensation value when the outdoor ambient humidity is on a downward trend.

[0096] In some embodiments of the present disclosure, the determination module 120 is also used to, when judging the defrost mode based on the corresponding humidity interval threshold after compensation, if it is determined according to the outdoor ambient humidity that the defrost mode is switched from the reversing defrost mode to the non-reversing defrost mode, then the defrost mode is maintained at the reversing defrost mode; if it is determined according to the outdoor ambient humidity that the defrost mode is switched from the non-reversing defrost mode to the reversing defrost mode, and the air conditioner is in the heating operation stage, then the air conditioner is controlled to operate in the reversing defrost mode; if it is determined according to the outdoor ambient humidity that the defrost mode is switched from the non-reversing defrost mode to the reversing defrost mode, and the air conditioner executes the non-reversing defrost mode, then the defrost mode is re-judged after the defrost is completed.

[0097] In some embodiments of the present disclosure, the determination module 120 determines that the non-reversing defrost mode is the second non-reversing defrost mode, which is specifically used for: the corrected outdoor heat exchanger temperature is less than the second compensation temperature threshold; the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold and lasts for a second preset time; the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the second preset value; the heating operation time of the air conditioner reaches the second set duration; the last time it was operated in the first non-reversing defrost mode, or it was operated in the first non-reversing defrost mode for a first preset number of times in a row; wherein, the second compensation temperature threshold is greater than the first compensation temperature threshold, the fourth heat exchanger temperature threshold is greater than the third heat exchanger temperature threshold, and the second set duration is greater than the first set duration.

[0098] In some embodiments of the present disclosure, the determination module 120 determines that the non-reversing defrost mode is the first non-reversing defrost mode, which is specifically used for: the corrected outdoor heat exchanger temperature is less than the third compensation temperature threshold; the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold and lasts for a third preset time; the heating operation time of the air conditioner reaches a third set duration; wherein, the third compensation temperature threshold is greater than the second compensation temperature threshold, the third preset time is greater than the second preset time, and the third set duration is greater than the first set duration.

[0099] In some embodiments of the present disclosure, the determination module 120 determines that the non-reversing defrost mode is the third non-reversing defrost mode, which is specifically used for: the corrected outdoor heat exchanger temperature is less than the fourth compensation temperature threshold; the outdoor heat exchanger temperature is less than the third heat exchanger temperature threshold; the outdoor heat exchanger temperature is less than the fourth heat exchanger temperature threshold and lasts for a fourth preset time; the heating operation time of the air conditioner reaches a fourth set duration; wherein, the fourth compensation temperature threshold is greater than the third compensation temperature threshold, the fourth preset time is greater than the third preset time, and the fourth set duration is greater than the first set duration.

[0100] In some embodiments of the present disclosure, the control module 130 performs defrost control on the air conditioner according to the second non-reversing defrost mode, specifically for: controlling the four-way valve not to reverse, the compressor to operate at a first operating frequency, the outdoor fan to stop, the electronic expansion valve to a first preset opening, and the speed of the indoor fan to decrease according to a preset rate.

[0101] In some embodiments of the present disclosure, the control module 130 performs defrost control on the air conditioner according to the first non-reversing defrost mode, specifically for: controlling the four-way valve not to reverse, the compressor to operate at a second operating frequency, the outdoor fan to stop, the electronic expansion valve to a second preset opening, and the speed of the indoor fan to remain unchanged; wherein the second operating frequency is less than the first operating frequency.

[0102] In some embodiments of the present disclosure, the control module 130 performs defrost control on the air conditioner according to the third non-reversing defrost mode, specifically for: controlling the four-way valve not to reverse, the compressor to operate at a third operating frequency, the outdoor fan to stop, the electronic expansion valve to a third preset opening, and the speed of the indoor fan to remain unchanged; wherein the third operating frequency is less than the first operating frequency.

[0103] It should be noted that for details not disclosed in the defrost control device of the air conditioner in the embodiment of the present disclosure, please refer to the details disclosed in the defrost control method of the air conditioner in the embodiment of the present disclosure, and no further details will be given.

[0104] According to the defrost control device for an air conditioner according to the embodiment of the present disclosure, when the air conditioner is operating in heating mode for a first set duration, the acquisition module acquires the outdoor heat exchanger temperature, the outdoor ambient temperature, and the outdoor ambient humidity. If the determination module determines that the air conditioner does not meet the conditions for entering the reversing defrost mode based on the outdoor heat exchanger temperature, the outdoor ambient temperature, and the outdoor ambient humidity, the determination module determines the non-reversing defrost mode based on the outdoor ambient temperature and the outdoor ambient humidity. The control module then performs defrost control on the air conditioner according to the non-reversing defrost mode. Thus, when the air conditioner is operating in heating mode, the device determines the non-reversing defrost mode according to different temperature and humidity ranges, and performs a corresponding defrost control method on the air conditioner according to the non-reversing defrost mode, thereby reducing the frequency of defrosting of the air conditioner, reducing indoor temperature fluctuations, reducing abnormal defrosting noises, extending the continuous heating time, and improving the user's heating experience.

[0105] Corresponding to the above embodiments, the present disclosure also proposes a computer-readable storage medium.

[0106] The computer-readable storage medium of the present disclosure stores a defrost control program for an air conditioner, and when the defrost control program for the air conditioner is executed by a processor, the defrost control method for the air conditioner is implemented.

[0107] The computer-readable storage medium of the embodiment of the present disclosure can reduce the defrosting frequency of the air conditioner, reduce indoor temperature fluctuations, reduce abnormal defrosting sounds, extend the continuous heating time, and improve the user's heating experience by executing the above-mentioned defrosting control method of the air conditioner.

[0108] Corresponding to the above embodiments, the present disclosure also proposes an air conditioner.

[0109] As shown in Figure 6, the air conditioner 200 of the embodiment of the present disclosure includes a memory 210, a processor 220, and a defrost control program for the air conditioner stored in the memory 210 and executable on the processor 220. When the processor 220 executes the defrost control program for the air conditioner, the above-mentioned defrost control method for the air conditioner is implemented.

[0110] According to the air conditioner of the embodiment of the present disclosure, by executing the above-mentioned defrost control method of the air conditioner, the defrost frequency of the air conditioner can be reduced, the indoor temperature fluctuation can be reduced, the abnormal defrost sound can be reduced, the continuous heating time can be extended, and the user's heating experience can be improved.

[0111] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0112] It should be understood that various parts of the present disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0113] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0114] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0115] In this disclosure, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0116] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A defrost control method for an air conditioner, the method comprising: When the air conditioner is in heating operation for a first set time, obtaining an outdoor heat exchanger temperature, an outdoor ambient temperature, and an outdoor ambient humidity; If it is determined that the air conditioner does not meet the conditions for entering the reversing defrost mode according to the outdoor heat exchanger temperature, the outdoor ambient temperature, and the outdoor ambient humidity, determining the non-reversing defrost mode according to the outdoor ambient temperature and the outdoor ambient humidity; The air conditioner is defrosted according to the non-reversing defrost mode.

2. The method according to claim 1, wherein The conditions for entering reversing defrost mode include any of the following: The outdoor heat exchanger temperature is less than a first heat exchanger temperature threshold; The outdoor heat exchanger temperature is lower than a second heat exchanger temperature threshold and lasts for a first preset time; The indoor ambient temperature is lower than a first indoor temperature threshold and the sum of the indoor ambient temperature and the outdoor ambient temperature is lower than a first preset value; The outdoor environment humidity is greater than or equal to a preset humidity threshold, wherein the outdoor environment humidity threshold is determined according to the temperature range in which the outdoor environment temperature is located; The second heat exchanger temperature threshold is greater than the first heat exchanger temperature threshold.

3. The method according to claim 2, wherein: Entering reversing defrost mode conditions Include any of the following: The corrected outdoor heat exchanger temperature is less than a first compensation temperature threshold; During the first duration, the system operates in the first non-reversing defrost mode or the second non-reversing defrost mode, and does not enter the reversing defrost mode; During the second duration, the device operates in the third non-reversing defrost mode and does not enter the reversing defrost mode; The corrected outdoor heat exchanger temperature is determined according to the initial outdoor heat exchanger temperature, the initial outdoor ambient temperature, the current outdoor heat exchanger temperature and the current outdoor ambient temperature within a preset time interval, and the first duration is less than the second duration.

4. The method according to claim 3, wherein: Determining a non-reversing defrost mode according to the outdoor ambient temperature and the outdoor ambient humidity includes: Determining a humidity interval threshold corresponding to the outdoor ambient humidity according to the temperature interval of the outdoor ambient temperature; When the outdoor ambient humidity is within a corresponding humidity interval threshold, determining that the non-reversing defrost mode is the first non-reversing defrost mode or the second non-reversing defrost mode; When the outdoor environment humidity is not within the corresponding humidity interval threshold, the non-reversing defrost mode is determined to be a third non-reversing defrost mode.

5. The method according to any one of claims 2 to 4, wherein Also includes: When the outdoor environment humidity is on an upward trend, determining the defrost mode is performed based on the corresponding humidity interval threshold plus a preset compensation value; When the outdoor environment humidity is in a downward trend, the defrost mode is determined based on the corresponding humidity interval threshold minus the preset compensation value.

6. The method according to claim 5, wherein: Also includes: When determining the defrost mode according to the humidity interval threshold corresponding to the compensation, if it is determined according to the outdoor ambient humidity that the defrost mode is switched from the reversing defrost mode to the non-reversing defrost mode, the defrost mode is maintained at the reversing defrost mode; If it is determined according to the outdoor ambient humidity that the non-reversing defrost mode is switched to the reversing defrost mode, and the air conditioner is in a heating operation stage, controlling the air conditioner to operate in the reversing defrost mode; If it is determined according to the outdoor ambient humidity that the non-reversing defrost mode is switched to the reversing defrost mode, and the air conditioner executes the non-reversing defrost mode, the defrost mode is re-determined after defrosting is completed.

7. The method according to claim 4, wherein: Determining that the non-reversing defrost mode is the second non-reversing defrost mode includes: The corrected outdoor heat exchanger temperature is less than a second compensation temperature threshold; The outdoor heat exchanger temperature is less than a third heat exchanger temperature threshold; The outdoor heat exchanger temperature is lower than a fourth heat exchanger temperature threshold and lasts for a second preset time; The sum of the indoor ambient temperature and the outdoor ambient temperature is less than a second preset value; The heating operation time of the air conditioner reaches a second set time; The system was operated in the first non-reversing defrost mode last time, or was operated in the first non-reversing defrost mode for a first preset number of times continuously; The second compensation temperature threshold is greater than the first compensation temperature threshold, the fourth heat exchanger temperature threshold is greater than the third heat exchanger temperature threshold, and the second set time length is greater than the first set time length.

8. The method according to claim 7, wherein: Determining that the non-reversing defrost mode is the first non-reversing defrost mode includes: The corrected outdoor heat exchanger temperature is less than a third compensation temperature threshold; The outdoor heat exchanger temperature is lower than the third heat exchanger temperature threshold; The outdoor heat exchanger temperature is lower than the fourth heat exchanger temperature threshold and lasts for a third preset time; The heating operation time of the air conditioner reaches a third set duration; wherein, the third compensation temperature threshold is greater than the second compensation temperature threshold, the third preset time is greater than the second preset time, and the third set duration is greater than the first set duration.

9. The method according to claim 8, wherein Determining that the non-reversing defrost mode is the third non-reversing defrost mode includes: The corrected outdoor heat exchanger temperature is less than a fourth compensation temperature threshold; The outdoor heat exchanger temperature is lower than the third heat exchanger temperature threshold; The outdoor heat exchanger temperature is lower than the fourth heat exchanger temperature threshold and lasts for a fourth preset time; The heating operation time of the air conditioner reaches a fourth set time period; The fourth compensation temperature threshold is greater than the third compensation temperature threshold, the fourth preset time is greater than the third preset time, and the fourth set time length is greater than the first set time length.

10. The method according to claim 7, wherein: The method of controlling the air conditioner to defrost according to the second non-reversing defrost mode includes: The four-way valve is controlled not to be reversed, the compressor operates at a first operating frequency, the outdoor fan is stopped, the electronic expansion valve is at a first preset opening, and the speed of the indoor fan is reduced according to a preset rate.

11. The method according to claim 10, wherein: The method of controlling the air conditioner to defrost according to the first non-reversing defrost mode includes: The four-way valve is controlled not to be reversed, the compressor operates at a second operating frequency, the outdoor fan is stopped, the electronic expansion valve is at a second preset opening, and the speed of the indoor fan remains unchanged; wherein, the second operating frequency is less than the first operating frequency.

12. The method according to claim 10 or 11, wherein: The method of controlling the air conditioner to defrost according to the third non-reversing defrost mode includes: The four-way valve is controlled not to be reversed, the compressor is operated at a third operating frequency, the outdoor fan is stopped, the electronic expansion valve is at a third preset opening, and the speed of the indoor fan remains unchanged; wherein, the third operating frequency is less than the first operating frequency.

13. A defrost control device for an air conditioner, comprising: an acquisition module, configured to acquire an outdoor heat exchanger temperature, an outdoor ambient temperature, and an outdoor ambient humidity when the air conditioner is in heating operation for a first set time period; a determining module for determining a non-reversing defrost mode according to the outdoor ambient temperature and the outdoor ambient humidity when it is determined that the air conditioner does not meet the conditions for entering the reversing defrost mode according to the outdoor heat exchanger temperature, the outdoor ambient temperature, and the outdoor ambient humidity; A control module is used to perform defrost control on the air conditioner according to the non-reversing defrost mode.

14. A computer-readable storage medium storing a defrost control program for an air conditioner, wherein the defrost control program for the air conditioner is executed by a processor to implement the defrost control method for the air conditioner according to any one of claims 1 to 12.

15. An air conditioner comprising a memory, a processor, and a defrost control program for the air conditioner stored in the memory and executable on the processor, wherein when the processor executes the defrost control program for the air conditioner, the defrost control method for the air conditioner according to any one of claims 1 to 12 is implemented.

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