Control method of air conditioner and air conditioner

Abstract

The present application relates to the technical field of air conditioners, and particularly provides an air conditioner control method and an air conditioner. To solve the problem of indoor environment temperature reduction caused by long-time operation of the defrosting mode of the existing air conditioner, the air conditioner control method comprises the following steps: obtaining outdoor environment temperature T W and indoor environment temperature T L when the defrosting mode is operated; obtaining a pre-stored outdoor heat exchanger temperature threshold Tpi corresponding to T W and T L ; obtaining outdoor heat exchanger temperature Tp; and comparing the size of the outdoor heat exchanger temperature Tp and the outdoor heat exchanger temperature threshold Tpi to selectively continue operating the defrosting mode or exit the defrosting mode. When the user uses the air conditioner to operate the defrosting mode, the air conditioner sends the obtained T W and T L to a cloud platform or a memory of the air conditioner to obtain Tpi corresponding thereto, and when Tp is greater than or equal to Tpi, it indicates that the outdoor heat exchanger is frosting and melting, and the defrosting mode is exited, otherwise, the defrosting mode is not exited, so that the defrosting time is more accurate and long-time defrosting is prevented.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, specifically providing an air conditioner control method and an air conditioner. Background Technology

[0002] In existing air-cooled heat pump air conditioners, when the outdoor temperature and humidity drop to a certain level during heating operation, the outdoor heat exchanger experiences insufficient heat exchange. After a period of operation, the outdoor unit frosts up, affecting heat exchange efficiency. When the frost reaches a certain level, the outdoor unit's heat exchange efficiency begins to decrease significantly. At this point, a four-way valve needs to be switched to defrost the outdoor heat exchanger. The traditional defrost mode exit condition is based on detecting the coil temperature of the outdoor heat exchanger. When the coil temperature exceeds a certain fixed value, the defrost mode ends. However, this method is not suitable for many operating conditions. For example, when the outdoor ambient temperature is below -15 degrees Celsius, even if the frost on the outdoor heat exchanger has completely melted in defrost mode, the coil temperature is unlikely to reach the aforementioned fixed value, resulting in prolonged defrosting, which in turn lowers the indoor ambient temperature and affects user comfort.

[0003] Accordingly, there is a need in the field for a new control method for air conditioners to solve the problem of indoor temperature drop caused by prolonged operation of the defrost mode in existing air conditioners. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem of indoor ambient temperature reduction caused by prolonged operation of the defrosting mode of existing air conditioners.

[0005] In a first aspect, the present invention provides a control method for an air conditioner, the control method comprising: when operating in defrost mode, acquiring the outdoor ambient temperature T. W and indoor ambient temperature T L ;

[0006] According to the outdoor ambient temperature T W and the indoor ambient temperature T L Obtain the corresponding pre-stored outdoor heat exchanger temperature threshold Tpi; obtain the outdoor heat exchanger temperature Tp; compare the outdoor heat exchanger temperature Tp with the outdoor heat exchanger temperature threshold Tpi to selectively continue running the defrost mode or exit the defrost mode.

[0007] In the preferred embodiment of the above-mentioned air conditioner control method, the step of "selectively continuing to operate the defrost mode or exiting the defrost mode by comparing the outdoor heat exchanger temperature Tp with the outdoor heat exchanger temperature threshold Tpi" further includes:

[0008] When Tp ≥ Tpi, exit the defrost mode.

[0009] In the preferred embodiment of the above-mentioned air conditioner control method, the step of "selectively continuing to operate the defrost mode or exiting the defrost mode by comparing the outdoor heat exchanger temperature Tp with the outdoor heat exchanger temperature threshold Tpi" further includes:

[0010] When Tp < Tpi and the defrosting duration is greater than or equal to the first preset duration, the defrosting mode is exited.

[0011] In the preferred embodiment of the above-mentioned air conditioner control method, after the step of "exiting the defrosting mode", the control method further includes:

[0012] If Tp < Tpi and the defrosting duration is greater than or equal to the first preset duration before exiting the defrosting mode, then increase the defrosting compressor frequency in the defrosting mode.

[0013] In the preferred embodiment of the above-mentioned air conditioner control method, after the step of "exiting the defrosting mode", the control method further includes:

[0014] If Tp ≥ Tpi and the defrosting duration is less than the first preset duration before exiting the defrosting mode, then reduce the frequency of the defrosting compressor in the defrosting mode.

[0015] In the preferred embodiment of the above-mentioned air conditioner control method, after the step of "exiting the defrosting mode", the control method further includes:

[0016] If Tp < Tpi and the defrosting duration is greater than or equal to the first preset duration before exiting the defrosting mode multiple times in a row, then reduce the maximum operating frequency of the compressor in the heating mode.

[0017] In the preferred embodiment of the control method for the aforementioned air conditioner, after the step of "if Tp < Tpi and the defrosting duration is greater than or equal to the first preset duration before exiting the defrosting mode multiple times consecutively, then reduce the maximum operating frequency of the compressor in the heating mode", the control method includes:

[0018] If the compressor's maximum operating frequency has reached the lower limit and it continues to exit the defrost mode multiple times in a row, and Tp < Tpi, and the defrost duration is greater than or equal to the first preset duration, then a warning message will be sent.

[0019] In the preferred embodiment of the above-mentioned air conditioner control method, the step of "selectively continuing to operate the defrost mode or exiting the defrost mode by comparing the outdoor heat exchanger temperature Tp with the outdoor heat exchanger temperature threshold Tpi" further includes:

[0020] When Tp < Tpi and the defrosting time is less than the first preset time, the defrosting mode continues to run.

[0021] In the preferred embodiment of the above-mentioned air conditioner control method, the step of "exiting the defrosting mode when Tp≥Tpi" further includes:

[0022] When Tp≥Tpi continues for a second preset duration, the defrosting mode is exited.

[0023] In a second aspect, the present invention also provides an air conditioner, the air conditioner including a memory and a processor, the memory being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the control method of the air conditioner described in any of the above technical solutions.

[0024] Those skilled in the art will understand that the control method of the air conditioner of the present invention includes: when operating the defrost mode, acquiring the outdoor ambient temperature T. W and indoor ambient temperature T L According to the outdoor ambient temperature T W and indoor ambient temperature T L Get the corresponding pre-stored outdoor heat exchanger temperature threshold Tpi; get the outdoor heat exchanger temperature Tp; compare the outdoor heat exchanger temperature Tp with the outdoor heat exchanger temperature threshold Tpi to selectively continue running the defrost mode or exit the defrost mode.

[0025] The inventors obtained the outdoor heat exchanger temperature at which the frost completely melts under different outdoor and indoor ambient temperatures through experimental testing; this is the aforementioned outdoor heat exchanger temperature threshold Tpi. These values ​​were then stored. When the user operates the air conditioner in defrost mode, the air conditioner will use the acquired Tpi temperature threshold. W Numerical value and T L The data is sent to the cloud platform or the air conditioner's memory to retrieve the corresponding Tpi value. The retrieved outdoor heat exchanger temperature Tp is compared with the temperature Tpi when the outdoor heat exchanger is frost-free. Based on the comparison result, it is determined whether to continue running the defrost mode or exit it. For example, when the outdoor heat exchanger temperature Tp is greater than or equal to the outdoor heat exchanger temperature threshold Tpi, it means that all the frost on the outdoor heat exchanger has melted, and the defrost mode can be exited. When the outdoor heat exchanger temperature Tp is less than the outdoor heat exchanger temperature threshold Tpi, it means that the frost on the outdoor heat exchanger has not completely melted, and the defrost mode should not be exited. The pre-stored Tpi value is based on the air conditioner model, operating condition, and outdoor ambient temperature Tp. W and indoor ambient temperature T L The parameters vary, so the control method of the present invention can be applied to different usage scenarios and working conditions. Even when the outdoor ambient temperature is low, it can still accurately judge the defrosting situation and exit the defrosting mode in time, thereby avoiding the indoor temperature from being too low due to long-term operation of the defrosting mode, which would affect the user's comfort. Attached Figure Description

[0026] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0027] Figure 1 This is a flowchart of the main steps of the air conditioner control method of the present invention;

[0028] Figure 2 This is a flowchart illustrating one embodiment of the control method for an air conditioner according to the present invention.

[0029] Figure 3 This is a flowchart illustrating another embodiment of the air conditioner control method of the present invention. Detailed Implementation

[0030] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific applications. For example, the air conditioner control method in this application can be used for wall-mounted air conditioners, cabinet air conditioners, central air conditioners, or multi-split air conditioners, etc. The present invention does not impose any limitations on the type of air conditioner; it can also be applied to devices other than air conditioners that require defrosting.

[0031] It should be noted that in the description of this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Specifically, the air conditioner of the present invention includes an indoor unit, an outdoor unit, and a refrigerant circulation loop disposed between the indoor and outdoor units. The indoor unit includes an indoor heat exchanger, and the outdoor unit includes an outdoor heat exchanger and a variable frequency compressor. The indoor heat exchanger, outdoor heat exchanger, and variable frequency compressor are all disposed on the refrigerant circulation loop. The refrigerant circulates between the indoor and outdoor units through the refrigerant circulation loop to exchange heat with the indoor environment through the indoor unit, thereby meeting the user's heat exchange needs. During use, the user can control the operation of the air conditioner by setting the temperature. Those skilled in the art will understand that the present invention does not impose any limitations on the specific structure of the air conditioning system. Technicians can set the specific structure of the air conditioner according to actual usage needs, as long as the outdoor unit of the air conditioner has a variable frequency compressor and an outdoor heat exchanger; such changes in specific application do not deviate from the basic principles of the present invention and fall within the protection scope of the present invention.

[0033] Furthermore, the air conditioner also includes an outdoor ambient temperature sensor, an outdoor heat exchanger temperature sensor, an indoor ambient temperature sensor, and a controller. The outdoor ambient temperature sensor can detect the ambient temperature of the outdoor unit and does not impose any restrictions on the detection location; those skilled in the art can set it as needed. The outdoor heat exchanger temperature sensor can detect the temperature of the outdoor heat exchanger. Preferably, the outdoor heat exchanger temperature sensor is placed on the outdoor coil to detect the temperature of the outdoor coil, but this is not limiting; those skilled in the art can also detect the temperature at other locations on the outdoor heat exchanger, and they can set it as needed. The indoor ambient temperature sensor can detect the ambient temperature of the indoor unit and does not impose any restrictions on the detection location; those skilled in the art can set it as needed. The controller can acquire the outdoor ambient temperature, the outdoor heat exchanger temperature, and the indoor ambient temperature. The controller can also control the operating status of the air conditioner and the frequency of the inverter compressor, etc. For example, the air conditioner includes a heating mode and a defrost mode. The compressor operating frequency in the heating mode is different from the operating parameters in the defrost mode, and the controller can operate either the defrost mode or the heating mode separately. Those skilled in the art will understand that the present invention does not impose any restrictions on the specific structure and model of the controller, and technicians can set the structure and model of the controller according to actual usage requirements.

[0034] like Figure 1 As shown, to solve the problem of indoor temperature drop caused by prolonged operation of the defrost mode in existing air conditioners, this invention provides a control method for the aforementioned air conditioner, the control method comprising the following steps:

[0035] Step S100: When running defrost mode, obtain the outdoor ambient temperature T. W and indoor ambient temperature T L ;

[0036] Step S200: Based on the outdoor ambient temperature T W and indoor ambient temperature T L Obtain the corresponding pre-stored outdoor heat exchanger temperature threshold Tpi.

[0037] The inventors obtained the outdoor heat exchanger temperature Tpi when the outdoor heat exchanger completely melts under different outdoor and indoor ambient temperatures through experimental testing, and pre-stored the corresponding data. Specifically, the inventors obtained the outdoor ambient temperature Tpi of the air conditioner in defrost mode through experiments. W Indoor ambient temperature T LThe corresponding outdoor heat exchanger temperature threshold Tpi is calculated and stored in the cloud platform's database. When the user uses the air conditioner, it connects to the cloud platform after being turned on. During defrost mode, the air conditioner will obtain the Tpi value. W Numerical value and T L The data is sent to the cloud platform and the corresponding Tpi value is retrieved. Among them, the stored T... W Numerical value and T L The numerical values ​​can be set by those skilled in the art according to actual needs. The values ​​can be a single temperature value or a temperature range value. If the air conditioner is equipped with multiple outdoor heat exchangers, it can also store the temperature Tpi of each outdoor heat exchanger and the corresponding outdoor ambient temperature T. W and indoor ambient temperature T L The pre-stored data can also include data on different air conditioner models at different outdoor ambient temperatures (T). W Indoor ambient temperature T L The corresponding TPI value is used to retrieve the appropriate data during defrosting of different air conditioner models.

[0038] However, it should be noted that the outdoor ambient temperature T... W Indoor ambient temperature T L The data for the corresponding outdoor heat exchanger temperature threshold Tpi can be stored not only in a cloud platform database, but also in the air conditioner's memory or an external server, etc. This invention does not specify the outdoor ambient temperature T. W Indoor ambient temperature T L There are no restrictions on the data storage method for the corresponding outdoor heat exchanger temperature threshold Tpi, as long as the data can be stored and the air conditioner can retrieve the data. Those skilled in the art can set it as needed.

[0039] Step S300: Obtain the outdoor heat exchanger temperature Tp;

[0040] Step S400: Compare the outdoor heat exchanger temperature Tp with the outdoor heat exchanger temperature threshold Tpi to selectively continue running the defrost mode or exit the defrost mode.

[0041] After obtaining the outdoor heat exchanger temperature threshold Tpi, this invention compares the real-time outdoor heat exchanger temperature Tp with the temperature value Tpi when the outdoor heat exchanger is free of frost. Based on the comparison result, it determines whether to continue running the defrosting mode or exit the defrosting mode. For example, when the outdoor heat exchanger temperature Tp is greater than or equal to the outdoor heat exchanger temperature threshold Tpi, it means that all the frost on the outdoor heat exchanger has melted, and the defrosting mode can be exited. When the outdoor heat exchanger temperature Tp is less than the outdoor heat exchanger temperature threshold Tpi, it means that the frost on the outdoor heat exchanger has not melted completely, and the defrosting mode is not exited.

[0042] The outdoor heat exchanger temperature threshold Tpi of this invention is related to the air conditioner model and the outdoor ambient temperature T. W and indoor ambient temperature T L The value of Tpi is related to parameters such as the air conditioner model and the outdoor ambient temperature. W and indoor ambient temperature T L The parameters vary, so the control method of the present invention can be applied to different models, usage scenarios and operating conditions. Even when the outdoor ambient temperature is low, it can still accurately judge the defrosting situation and exit the defrosting mode in time, thereby avoiding the indoor temperature from being too low due to long-term operation of the defrosting mode, which would affect the user's comfort.

[0043] like Figure 2 As shown, a possible implementation of the control method for the air conditioner of the present invention will be described below.

[0044] Specifically, the control method includes the following steps:

[0045] Step S501: Air conditioner starts heating mode;

[0046] Step S502: The air conditioner operates in heating mode;

[0047] Step S503: Has the command to run defrost mode been received?

[0048] If yes, proceed to step S504; otherwise, proceed to step S502.

[0049] The command to activate defrost mode can be: a command sent by the user through pressing a button on the air conditioner or through a mobile app or other terminal device; or a command sent after the air conditioner has completed a certain program, such as automatically sending a command to activate defrost mode after running in heating mode for a period of time, or when the outdoor heat exchanger temperature drops to a threshold. Once the command to activate defrost mode is sent, the air conditioner receives the command.

[0050] Step S504: The air conditioner operates at the defrost compressor frequency;

[0051] Step S505: Obtain the outdoor ambient temperature T in real time. W Indoor ambient temperature T L ;

[0052] Step S506: Based on the outdoor ambient temperature T W and indoor ambient temperature T L Obtain the corresponding outdoor heat exchanger temperature threshold Tpi;

[0053] Step S507: Obtain the outdoor heat exchanger temperature Tp in real time;

[0054] Step S508: Determine whether Tp≥Tpi for the second preset duration is true?

[0055] If yes, proceed to step S509; otherwise, proceed to step S510.

[0056] Step S509: Exit defrost mode;

[0057] Step S510: Determine whether the defrosting time is greater than or equal to the first preset time.

[0058] If yes, proceed to step S509; otherwise, proceed to step S504.

[0059] If the defrosting time is less than the first preset time and the outdoor heat exchanger temperature Tp is greater than or equal to the outdoor heat exchanger temperature threshold Tpi, it means that all the frost on the outdoor heat exchanger has melted, and the defrosting mode is exited. If the outdoor heat exchanger temperature Tp is less than the outdoor heat exchanger temperature threshold Tpi, it means that not all the frost on the outdoor heat exchanger has melted, but the defrosting time is greater than or equal to the first preset time, indicating that the defrosting time has reached the threshold. Continuing to run the defrosting mode will affect the indoor temperature. Therefore, even if not all the frost on the outdoor heat exchanger has melted, the defrosting mode is still exited to ensure the comfort of the indoor temperature.

[0060] After step S509, as Figure 3 As shown, the control method also includes:

[0061] Step S601: Receive compressor frequency modification determination command;

[0062] Step S6011: If Tp < Tpi and the defrosting duration is greater than or equal to the first preset duration before exiting the defrosting mode, then increase the frequency of the defrosting compressor in the defrosting mode.

[0063] If the outdoor heat exchanger temperature Tp is still lower than the outdoor heat exchanger temperature threshold Tpi when the previous defrost duration was greater than or equal to the first preset duration, then the defrost mode operation program is modified, i.e., the frequency of the defrost compressor in defrost mode is increased, thereby speeding up the next defrost cycle. For example, the frequency of the defrost compressor in defrost mode is modified to 1.08 times the existing defrost compressor frequency.

[0064] Step S6012: If Tp≥Tpi and the defrosting duration is less than the first preset duration before exiting the defrosting mode, then reduce the frequency of the defrosting compressor in the defrosting mode.

[0065] If the outdoor heat exchanger temperature Tp is greater than or equal to the outdoor heat exchanger temperature threshold Tpi when the previous defrost duration was less than the first preset duration, then the defrost mode operation program is modified to reduce the defrost compressor frequency in defrost mode, thereby saving compressor energy consumption. For example, the defrost compressor frequency in defrost mode is modified to 0.98 times the existing defrost compressor frequency.

[0066] Step S6013: If Tp < Tpi and the defrosting duration is greater than or equal to the first preset duration before exiting the defrosting mode multiple times in a row, then reduce the maximum operating frequency of the compressor in the heating mode.

[0067] For example, if the outdoor heat exchanger temperature Tp remains below the outdoor heat exchanger temperature threshold Tpi even after the defrosting time has reached the first preset duration before exiting defrosting mode twice consecutively, it indicates that the compressor's maximum operating frequency is too high, resulting in excessive frost buildup on the outdoor heat exchanger. Therefore, by modifying the heating mode's operating program to reduce the compressor's maximum operating frequency in heating mode, frost buildup on the outdoor heat exchanger can be reduced. For example, the compressor's maximum operating frequency in heating mode can be modified to 0.95 times the existing maximum operating frequency.

[0068] Step S6014: If the compressor's maximum operating frequency has reached the lower limit and it continues to exit the defrost mode multiple times, and Tp < Tpi, and the defrost duration is greater than or equal to the first preset duration, then a warning message is sent to the cloud platform.

[0069] To ensure the normal operation of the air conditioner, the compressor's maximum operating frequency has a lower limit. If the compressor's maximum operating frequency has been adjusted to the lower limit, and the outdoor heat exchanger temperature Tp fails to reach the outdoor heat exchanger temperature threshold Tpi within the longest defrosting time for several consecutive times at this lower limit, it indicates that the lower limit of the maximum operating frequency may be set too high, resulting in excessive frost buildup on the outdoor heat exchanger, or it may be a malfunction of the air conditioner. In this case, a warning message is sent to the cloud platform. Upon receiving the warning message, maintenance personnel can troubleshoot the air conditioner and repair it promptly. If the air conditioner is not faulty, the lower limit of the compressor's maximum operating frequency stored in the cloud platform database is adjusted.

[0070] Warning messages can also be sent to users via mobile phones / iPads, smart speakers, and other terminal devices. They can also be sent to air conditioners by controlling alarm devices to generate different alarm sounds.

[0071] It should be noted that "continuously multiple times" in steps S6013 and S6014 can mean twice, three times, four times, five times, etc., and those skilled in the art can set it as needed, all of which should fall within the protection scope of this invention. It should also be noted that this invention does not limit the specific adjustment values ​​of the defrosting compressor frequency and the maximum compressor frequency; those skilled in the art can set them as needed, and all of which should fall within the protection scope of this invention.

[0072] In summary, this invention, by storing outdoor heat exchanger temperature thresholds Tpi under different operating conditions in a cloud platform database, can accurately determine the outdoor heat exchanger temperature at which frost melts when the air conditioner is in defrost mode, based on both outdoor and indoor ambient temperatures. P When the outdoor heat exchanger temperature threshold Tpi is reached, it indicates that the frost has melted and the defrosting mode has been exited. However, if the outdoor heat exchanger temperature Tpi remains unsatisfied even after prolonged operation of defrosting mode, the defrosting mode will not be activated. P Once the outdoor heat exchanger temperature threshold Tpi is reached, the defrost mode is exited to prevent the indoor ambient temperature from dropping. Furthermore, after exiting defrost mode, the compressor frequency parameters in both the defrost mode and heating mode programs are modified based on the previous defrost duration and outdoor heat exchanger temperature. This accelerates subsequent defrosting, reduces energy consumption during defrosting, and promptly detects any abnormalities in the air conditioner parameters.

[0073] As described in the first paragraph of this section, the above embodiments are merely used to illustrate the principles of the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above structure so that the present invention can be applied to more specific application scenarios.

[0074] In addition, the present invention also provides an air conditioner including a memory and a processor, the memory being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the control method of the air conditioner described in any of the above embodiments.

[0075] Those skilled in the art will understand that the aforementioned air conditioner also includes other well-known structures, such as processors, controllers, and memories. These memories include, but are not limited to, random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), volatile memory, non-volatile memory, serial memory, parallel memory, or registers. Processors include, but are not limited to, CPLD / FPGA, DSP, ARM processors, and MIPS processors. To avoid unnecessarily obscuring the embodiments of this disclosure, these well-known structures are not shown in the accompanying drawings.

[0076] Although the steps in the above embodiments are described in the above order, those skilled in the art will understand that in order to achieve the effect of this embodiment, different steps do not need to be executed in such an order, and they can be executed simultaneously (in parallel) or in a reverse order.

[0077] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, The control method includes: When running defrost mode, obtain the outdoor ambient temperature TW and the indoor ambient temperature TL; The corresponding pre-stored outdoor heat exchanger temperature threshold Tpi is obtained based on the outdoor ambient temperature TW and the indoor ambient temperature TL. Obtain the outdoor heat exchanger temperature Tp; The outdoor heat exchanger temperature Tp is compared with the outdoor heat exchanger temperature threshold Tpi to selectively continue running the defrost mode or exit the defrost mode. After the step of "exiting the defrost mode", the control method further includes: If Tp < Tpi and the defrosting duration is greater than or equal to the first preset duration before exiting the defrosting mode, then increase the frequency of the defrosting compressor in the defrosting mode. If Tp < Tpi and the defrosting duration is greater than or equal to the first preset duration before exiting the defrosting mode multiple times in a row, then reduce the maximum operating frequency of the compressor in the heating mode.

2. The control method for an air conditioner according to claim 1, characterized in that, The step of "comparing the outdoor heat exchanger temperature Tp with the outdoor heat exchanger temperature threshold Tpi to selectively continue running the defrost mode or exit the defrost mode" further includes: When Tp ≥ Tpi, exit the defrost mode.

3. The control method for an air conditioner according to claim 1, characterized in that, The step of "comparing the outdoor heat exchanger temperature Tp with the outdoor heat exchanger temperature threshold Tpi to selectively continue running the defrost mode or exit the defrost mode" further includes: When Tp < Tpi and the defrosting duration is greater than or equal to the first preset duration, the defrosting mode is exited.

4. The control method for an air conditioner according to claim 1, characterized in that, After the step of "exiting the defrost mode", the control method further includes: If Tp ≥ Tpi and the defrosting duration is less than the first preset duration before exiting the defrosting mode, then reduce the frequency of the defrosting compressor in the defrosting mode.

5. The control method for an air conditioner according to claim 1, characterized in that, Following the step of "if Tp < Tpi and the defrosting duration is greater than or equal to the first preset duration before exiting the defrosting mode multiple times consecutively," the control method includes: If the compressor's maximum operating frequency has reached the lower limit and it continues to exit the defrost mode multiple times in a row, and Tp < Tpi, and the defrost duration is greater than or equal to the first preset duration, then a warning message will be sent.

6. The control method for an air conditioner according to claim 2, characterized in that, The step of "comparing the outdoor heat exchanger temperature Tp with the outdoor heat exchanger temperature threshold Tpi to selectively continue running the defrost mode or exit the defrost mode" further includes: When Tp < Tpi and the defrosting time is less than the first preset time, the defrosting mode continues to run.

7. The control method for an air conditioner according to claim 2, characterized in that, The step of "exiting the defrost mode when Tp≥Tpi" further includes: When Tp≥Tpi continues for a second preset duration, the defrosting mode is exited.

8. An air conditioner, characterized in that, The air conditioner includes a memory and a processor, the memory being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the control method of the air conditioner according to any one of claims 1-7.

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