Defrosting control method and device, air conditioner and computer readable storage medium

Abstract

The embodiment of the invention provides a defrosting control method and device, an air conditioner and a computer readable storage medium. The defrosting control method comprises the steps that the frosting degree of an outdoor heat exchanger is determined; in response to determining that the outdoor heat exchanger is in the thin frost state, the air conditioner is controlled to enter a thin frost non-reversing defrosting mode; in response to determining that the outdoor heat exchanger is in the medium frost state, the air conditioner is controlled to enter a medium frost non-reversing defrosting mode; and in response to determining that the outdoor heat exchanger is in the heavy frost state, the air conditioner is controlled to enter a reverse circulation defrosting mode.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and in particular to a defrost control method, device, air conditioner and computer-readable storage medium. Background Art

[0002] When the air conditioner is heating in a low temperature environment, the outdoor heat exchanger is prone to frost, resulting in reduced heating performance. In the related art, the air conditioner usually needs to perform reverse cycle defrosting frequently, and the air conditioner needs to stop heating during reverse cycle defrosting, resulting in poor heating effect. Summary of the invention

[0003] The embodiments of the present application provide a defrost control method, device, air conditioner and computer-readable storage medium, which can avoid frequent reverse cycle defrosting of the air conditioner and improve the heating effect of the air conditioner.

[0004] In a first aspect, an embodiment of the present application provides a defrost control method, including: determining the degree of frost of an outdoor heat exchanger; in response to determining that the outdoor heat exchanger is in a light frost state, controlling the air conditioner to enter a light frost non-reversing defrost mode; in response to determining that the outdoor heat exchanger is in a medium frost state, controlling the air conditioner to enter a medium frost non-reversing defrost mode; in response to determining that the outdoor heat exchanger is in a heavy frost state, controlling the air conditioner to enter a reverse cycle defrost mode.

[0005] In some embodiments, determining the degree of frost of the outdoor heat exchanger includes: in response to determining that the duration of satisfying the first preset condition is greater than the first preset time, determining that the outdoor heat exchanger is in a light frost state; in response to determining that the duration of satisfying the second preset condition is greater than the second preset time, determining that the outdoor heat exchanger is in a medium frost state; in response to determining that the third preset condition is satisfied, determining that the outdoor heat exchanger is in a heavy frost state; the first preset condition is: the outdoor ambient temperature is greater than or equal to the first preset temperature and less than 0°C, the outdoor ambient humidity is less than the preset humidity, and the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is less than the first preset temperature difference; the second preset condition is: the outdoor ambient temperature is greater than or equal to the first preset temperature and less than 0°C, the outdoor ambient humidity is less than the preset humidity, and the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is greater than or equal to the first preset temperature difference and less than the second preset temperature difference; the third preset condition is: the outdoor ambient temperature is less than the first preset temperature, or the outdoor ambient humidity is greater than or equal to the preset humidity, or the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is greater than or equal to the second preset temperature difference; the first preset time is less than the second preset time, and the first preset temperature difference is less than the second preset temperature difference.

[0006] In some embodiments, controlling the air conditioner to enter a thin frost non-reversing defrost mode includes: determining a speed change rate of the indoor fan according to the indoor coil temperature, wherein the absolute value of the speed change rate is greater than or equal to zero; determining a first target frequency of the compressor, a first target speed of the outdoor fan, and a first opening reduction rate of the electronic expansion valve according to the outdoor ambient temperature, wherein the opening reduction rate is less than zero; controlling the indoor fan to gradually change from an initial speed at the speed change rate or remain unchanged, the compressor to operate at the first target frequency, the outdoor fan to operate at the first target speed, and controlling the electronic expansion valve to operate at the maximum opening for a third preset time and then reduce to an initial opening at the first opening reduction rate; the initial speed is the speed of the indoor fan before entering the thin frost non-reversing defrost mode, and the initial opening is the opening of the electronic expansion valve before entering the thin frost non-reversing defrost mode.

[0007] In some embodiments, after controlling the air conditioner to enter a light frost non-reversing defrost mode, the defrost control method includes: determining whether the time elapsed from entering the light frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is greater than or equal to a first threshold time, or determining whether a second preset condition is met; in response to determining that the time elapsed from entering the light frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is greater than or equal to the first threshold time, or determining that the second preset condition is met, controlling the air conditioner to switch from the light frost non-reversing defrost mode to the medium frost non-reversing defrost mode.

[0008] In some embodiments, the defrost control method includes: in response to determining that the time elapsed from entering the thin frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is less than a first threshold time, determining a first correction time value based on the time elapsed from entering the thin frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C and the first target frequency; and correcting the third preset time length based on the first correction time value.

[0009] In some embodiments, the defrost control method includes: in response to determining that the time elapsed from entering the thin frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is less than a first threshold time, determining a second corrected time value based on the time elapsed from entering the thin frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C and the first target frequency; and correcting the first preset duration based on the second corrected time value.

[0010] In some embodiments, controlling the air conditioner to enter a medium frost non-reversing defrost mode includes: determining a second target frequency of the compressor, a second target speed of the outdoor fan, and a second opening reduction rate of the electronic expansion valve according to the outdoor ambient temperature, wherein the second opening reduction rate is greater than zero; controlling the indoor fan to be turned off, the compressor to operate at the second target frequency, the outdoor fan to operate at the second target speed, and controlling the electronic expansion valve to operate at the maximum opening for a fourth preset time and then reduce the opening to an initial opening at the second opening reduction rate; the initial opening is the opening of the electronic expansion valve before entering the medium frost non-reversing defrost mode.

[0011] In some embodiments, after controlling the air conditioner to enter the medium frost non-reversing defrost mode, the defrost control method includes: determining whether the time elapsed from entering the medium frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is less than a second threshold time, or determining whether a first preset condition is met; in response to determining that the time elapsed from entering the medium frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is less than the second threshold time, or determining that the first preset condition is met, controlling the air conditioner to switch from the medium frost non-reversing defrost mode to the thin frost non-reversing defrost mode.

[0012] In some embodiments, after controlling the air conditioner to enter the medium frost non-reversing defrost mode, the defrost control method includes: determining whether the time elapsed from entering the medium frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is greater than or equal to a third threshold time, or determining whether a third preset condition is met; in response to determining that the time elapsed from entering the medium frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is greater than or equal to the third threshold time, or determining that the third preset condition is met, controlling the air conditioner to switch from the medium frost non-reversing defrost mode to the reverse cycle defrost mode; the third threshold time is greater than the second threshold time.

[0013] In some embodiments, the defrost control method includes: in response to determining that the time elapsed from entering the mid-frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is less than the second threshold time and greater than or equal to the third threshold time, determining a third correction time value based on the time elapsed from entering the mid-frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C and the second target frequency; and correcting the fourth preset duration based on the third correction time value.

[0014] In some embodiments, the defrost control method includes: in response to determining that the time elapsed from entering the mid-frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is less than the second threshold time and greater than or equal to the third threshold time, determining a fourth corrected time value based on the time elapsed from entering the mid-frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C and the second target frequency; and correcting the second preset duration based on the fourth corrected time value.

[0015] In a second aspect, an embodiment of the present application provides a defrost control device, including: a frost judgment circuit, configured to determine the degree of frost on an outdoor heat exchanger; a first defrost circuit, configured to control the air conditioner to enter a thin frost non-reversing defrost mode in response to determining that the outdoor heat exchanger is in a thin frost state; a second defrost circuit, configured to control the air conditioner to enter a medium frost non-reversing defrost mode in response to determining that the outdoor heat exchanger is in a medium frost state; a third defrost circuit, configured to control the air conditioner to enter a reverse cycle defrost mode in response to determining that the outdoor heat exchanger is in a heavy frost state.

[0016] In a third aspect, an embodiment of the present application provides an air conditioner, comprising: a memory storing a computer program; and a processor, wherein the computer program, when executed by the processor, implements the defrost control method described in any of the above embodiments.

[0017] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is loaded by a processor to execute the steps in the defrost control method described above.

[0018] The defrost control method provided in the embodiment of the present application first determines the degree of frost on the outdoor heat exchanger, and adopts different defrost modes according to the severity of frost on the outdoor heat exchanger. When the outdoor heat exchanger is in a light frost state, a light frost non-reversing defrost mode is adopted, and when the outdoor heat exchanger is in a medium frost state, a medium frost non-reversing defrost mode is adopted. The reverse cycle defrost mode is only adopted when the outdoor heat exchanger is in a heavy frost state, thereby avoiding frequent reverse cycle defrosting of the air conditioner and improving the heating effect of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a flow chart of a defrost control method provided by some embodiments of the present application;

[0021] Figure 2is a partial flow chart of a defrost control method provided by some embodiments of the present application;

[0022] Figure 3 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0023] Figure 4 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0024] Figure 5 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0025] Figure 6 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0026] Figure 7 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0027] Figure 8 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0028] Fig. 9 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0029] Fig.10 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0030] Fig.11 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0031] Fig.12 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0032] Fig.13 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0033] Fig.14 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0034] Fig.15 This is a structural diagram of an air conditioner provided in some embodiments of the present application.

[0035] Description of main component symbols:

[0036] 1- air conditioner, 10- processor, 20- memory. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0040] The use of "suitable for" or "configured to" in this application is meant to be open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. In addition, the use of "based on" is meant to be open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values ​​can be based on additional conditions or values ​​beyond the stated values ​​in practice.

[0041] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0042] like Figure 1 As shown, in the first aspect, an embodiment of the present application provides a defrost control method, which includes S10 to S40, and can avoid the air conditioner 1 from frequently performing reverse cycle defrosting, thereby improving the heating effect of the air conditioner 1.

[0043] S10: Determine the degree of frost of the outdoor heat exchanger. Here, the degree of frost of the outdoor heat exchanger may include a light frost state, a medium frost state, and a heavy frost state, and the thickness of the frost layer in the light frost state, the thickness of the frost layer in the medium frost state, and the thickness of the frost layer in the medium frost state increase in sequence.

[0044] S20: In response to determining that the outdoor heat exchanger is in a light frost state, controlling the air conditioner 1 to enter a light frost non-reversing defrosting mode.

[0045] When it is determined that the outdoor heat exchanger is in a light frost state, it means that the degree of frost on the outdoor heat exchanger is relatively light and will not significantly affect the heating performance of the air conditioner 1. At this time, the air conditioner 1 can be controlled not to perform reverse cycle defrosting, but to enter a light frost non-reversing defrosting mode corresponding to the light frost state. When the air conditioner 1 enters the light frost non-reversing defrosting mode, the reversing valve does not need to be reversed, but the defrosting effect is achieved by controlling parameters such as the compressor frequency, the outdoor fan speed, and the opening of the electronic expansion valve. At this time, the refrigerant in the air conditioner 1 is still in heating operation without stopping heating.

[0046] S30: In response to determining that the outdoor heat exchanger is in a medium frost state, controlling the air conditioner 1 to enter a medium frost non-reversing defrosting mode.

[0047] When it is determined that the outdoor heat exchanger is in a medium frost state, it means that the degree of frost on the outdoor heat exchanger is moderate and will not have a significant impact on the heating performance of the air conditioner 1. At this time, the air conditioner 1 can be controlled not to perform reverse cycle defrosting, but to enter the medium frost non-reversing defrosting mode corresponding to the medium frost state setting. When the air conditioner 1 enters the medium frost non-reversing defrosting mode, the reversing valve does not need to be reversed, but the defrosting effect is achieved by controlling parameters such as the compressor frequency, the outdoor fan speed, and the opening of the electronic expansion valve. At this time, the refrigerant in the air conditioner 1 is still in heating operation without stopping heating. Here, the operating parameters corresponding to the thin frost non-reversing defrosting mode and the medium frost non-reversing defrosting mode, such as the compressor frequency, the outdoor fan speed, and the opening of the electronic expansion valve, are different to meet different defrosting needs.

[0048] S40: In response to determining that the outdoor heat exchanger is in a heavy frosting state, controlling the air conditioner 1 to enter a reverse cycle defrosting mode.

[0049] When it is determined that the outdoor heat exchanger is in a heavy frost state, it means that the frost on the outdoor heat exchanger is serious and has a significant impact on the heating performance of the air conditioner 1. At this time, the air conditioner 1 needs to be controlled to enter the reverse cycle defrost mode to remove the frost layer on the outdoor heat exchanger as soon as possible. When the air conditioner 1 enters the reverse cycle defrost mode, the reversing valve needs to be reversed, and the refrigerant in the air conditioner 1 switches to cooling operation, so that the air conditioner 1 temporarily stops heating.

[0050] Compared with the related art, the defrost control method provided in the embodiment of the present application first determines the degree of frost on the outdoor heat exchanger, and adopts different defrost modes according to the degree of frost on the outdoor heat exchanger. When it is in a light frost state, a light frost non-reversing defrost mode is adopted, and when it is in a medium frost state, a medium frost non-reversing defrost mode is adopted. The reverse cycle defrost mode is only adopted in a heavy frost state, thereby avoiding frequent reverse cycle defrosting of the air conditioner 1 and improving the heating effect of the air conditioner 1.

[0051] The specific steps for determining the degree of frost on the outdoor heat exchanger can be determined according to actual needs, and the embodiments of the present application are not limited thereto. Figure 2 As shown, in some embodiments, S10 may include S11-S13.

[0052] S11: In response to determining that the duration of satisfying the first preset condition is greater than the first preset duration, determining that the outdoor heat exchanger is in a thin frost state.

[0053] Here, the first preset condition is: the outdoor ambient temperature is greater than or equal to the first preset temperature and less than 0°C, the outdoor ambient humidity is less than the preset humidity, and the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is less than the first preset temperature difference. When the above three conditions are met at the same time, it can be determined that the first preset condition is met; when the above three conditions are not met at the same time, it can be determined that the first preset condition is not met.

[0054] Here, the duration of the air conditioner 1 in the state satisfying the first preset condition can be monitored, and then the duration can be compared with the first preset duration. When it is determined that the duration is greater than the first preset duration, it can be determined that the outdoor heat exchanger is in a light frost state.

[0055] S12: In response to determining that the duration of satisfying the second preset condition is greater than the second preset duration, determining that the outdoor heat exchanger is in a medium frost state.

[0056] Here, the second preset condition is: the outdoor ambient temperature is greater than or equal to the first preset temperature and less than 0°C, the outdoor ambient humidity is less than the preset humidity, and the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is greater than or equal to the first preset temperature difference and less than the second preset temperature difference. The first preset time is less than the second preset time, and the first preset temperature difference is less than the second preset temperature difference. When the above three conditions are met at the same time, it can be determined that the second preset condition is met; when the above three conditions are not met at the same time, it can be determined that the second preset condition is not met.

[0057] Here, the duration of the air conditioner 1 being in a state that satisfies the second preset condition can be monitored, and then the duration can be compared with the second preset duration. When it is determined that the duration is greater than the second preset duration, it is determined that the outdoor heat exchanger is in a light frost state. Here, the first preset duration and the second preset duration can take the same value or different values, and the embodiment of the present application does not limit this.

[0058] S13: In response to determining that the third preset condition is satisfied, determining that the outdoor heat exchanger is in a heavy frost state.

[0059] Here, the third preset condition is: the outdoor ambient temperature is lower than the first preset temperature, or the outdoor ambient humidity is greater than or equal to the preset humidity, or the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is greater than or equal to the second preset temperature difference. When any one of the conditions is met, it can be determined that the third preset condition is met; when any one of the conditions is not met, it can be determined that the third preset condition is not met.

[0060] By setting S11 to S13, the degree of frost on the outdoor heat exchanger can be judged more accurately, and the corresponding defrost mode can be adopted accurately and timely, thereby increasing the control accuracy to avoid frequent reverse cycle defrosting of the air conditioner 1, thereby improving the heating effect of the air conditioner 1.

[0061] like Figure 3 As shown, in some embodiments, S20 may include S21-S23.

[0062] S21: Determine the speed change rate of the indoor fan according to the indoor coil temperature. Here, the indoor coil temperature is the heat exchange coil temperature on the indoor heat exchanger; the speed change rate is greater than or equal to zero, and is used to control the speed change of the indoor fan.

[0063] like Figure 4 As shown, in some examples, S21 may include S211 to S212.

[0064] S211: Determine the temperature range of the indoor coil temperature.

[0065] Here, several continuously distributed inner disk temperature intervals can be pre-set in the control system of the air conditioner 1, and a corresponding speed change rate value can be set for each inner disk temperature interval. The number of inner disk temperature intervals and the length of each inner disk temperature interval can be determined according to actual needs, and the embodiment of the present application does not limit this; generally speaking, if the number of inner disk temperature intervals is large, the number of speed change rate values ​​set is large, the matching degree of each speed change rate value and the inner disk temperature interval is high, and the classification accuracy of the speed change rate value is high; similarly, if the length of each inner disk temperature interval is short, the temperature range corresponding to each speed change rate value is small, the matching degree of each speed change rate value and the inner disk temperature interval is high, and the classification accuracy of the speed change rate value is high. Exemplarily, at least four inner disk temperature intervals can be set. The at least four inner disk temperature intervals are respectively a first inner disk temperature interval greater than or equal to the first inner disk threshold temperature, a second inner disk temperature interval greater than or equal to the second inner disk threshold temperature and less than the first inner disk threshold temperature, a third inner disk temperature interval greater than or equal to the third inner disk threshold temperature and less than the second inner disk threshold temperature, and a fourth inner disk temperature interval less than the third inner disk threshold temperature. Among them, the first inner disk threshold temperature is greater than the second inner disk threshold temperature, and the second inner disk threshold temperature is greater than the third inner disk threshold temperature; the specific values ​​of the first inner disk threshold temperature, the second inner disk threshold temperature, the third inner disk threshold temperature and the speed change rate can be determined according to actual needs, and the embodiment of the present application does not limit this.

[0066] S212: Determine the speed change rate of the indoor fan according to the temperature range.

[0067] After determining the temperature interval of the indoor coil temperature, the speed change rate value corresponding to the temperature interval can be determined and used as the speed change rate of the indoor fan. Exemplarily, at least four inner disk temperature intervals can be set as above, and at least four speed change rate values ​​can be set accordingly, and one speed change rate value is set corresponding to each inner disk temperature interval. At least four speed change rate values ​​include a first speed change rate value, a second speed change rate value, a third speed change rate value and a fourth speed change rate value. The first speed change rate value is set corresponding to the first inner disk temperature interval, the second speed change rate value is set corresponding to the second inner disk temperature interval, the third speed change rate value is set corresponding to the third inner disk temperature interval, and the fourth speed change rate value is set corresponding to the fourth inner disk temperature interval; the first speed change rate value is a positive value greater than zero, which is used to increase the speed of the indoor fan; the second speed change rate value is zero, which is used to maintain the speed of the indoor fan unchanged; the third speed change rate value is a negative value less than zero, which is used to decrease the speed of the indoor fan; the fourth speed change rate value is a negative value less than zero and less than the third speed change rate value, which is used to decrease the speed of the indoor fan faster.

[0068] Exemplarily, S21 may include: determining the speed change rate of the indoor fan, the pitch guide angle of the air guide plate, the opening and closing state of the left and right sweeping blades, and the operating state of the electric auxiliary heating device according to the indoor coil temperature. Furthermore, at least four inner coil temperature intervals may be set as above, and the corresponding speed change rate of the indoor fan, the pitch guide angle of the air guide plate, the opening and closing state of the left and right sweeping blades, and the operating state of the electric auxiliary heating device may be set for each outer ring temperature interval. For example, corresponding to the first inner disk temperature interval and the second inner disk temperature interval, the pitch air guide angles of the air guide plate are consistent with the angles before entering the thin frost non-reversing defrost mode, that is, the pitch air guide angles of the air guide plate are not adjusted, the left and right wind sweeping blades remain open for left and right wind sweeping, and the electric auxiliary heating device remains closed without providing electric auxiliary heating; corresponding to the third inner disk temperature interval, the pitch air guide angles of the air guide plate are adjusted to the first air guide angle, so that the air guide plate at least partially guides the air upward to prevent the air guide plate from blowing cold air downward, the left and right wind sweeping blades are closed to stop the left and right wind sweeping, and the electric auxiliary heating device remains closed without providing electric auxiliary heating; corresponding to the fourth inner disk temperature interval, the pitch air guide angles of the air guide plate are adjusted to the second air guide angle, so that the air guide plate as a whole guides the air upward to prevent the air guide plate from blowing cold air downward, the left and right wind sweeping blades are closed to stop the left and right wind sweeping, and the electric auxiliary heating device remains open to provide electric auxiliary heating.

[0069] S22: Determine the first target frequency of the compressor, the first target speed of the outdoor fan and the first opening reduction rate of the electronic expansion valve according to the outdoor ambient temperature. Here, the opening reduction rate is used to control the electronic expansion valve to gradually decrease, and the opening reduction rate is greater than zero.

[0070] like Figure 5 As shown, in some examples, S22 may include S221-S222.

[0071] S221: Determine the temperature range of the outdoor ambient temperature.

[0072] Here, several continuously distributed outer ring temperature intervals can be pre-set in the control system of the air conditioner 1, and the corresponding compressor frequency value, outdoor fan speed value and opening reduction rate value in the thin frost non-reversing defrosting mode can be set for each outer ring temperature interval. The number of outer ring temperature intervals and the length of each outer ring temperature interval can be determined according to actual needs, and the embodiment of the present application does not limit this; generally speaking, if the number of outer ring temperature intervals is large, the number of compressor frequency values, outdoor fan speed values ​​and opening reduction rate values ​​set is large, and the matching degree of each compressor frequency value, outdoor fan speed value, opening reduction rate value and the outer ring temperature interval is high, and the classification accuracy of the compressor frequency value, outdoor fan speed value and opening reduction rate value is high; similarly, if the length of each outer ring temperature interval is short, the temperature range corresponding to each compressor frequency value, outdoor fan speed value and opening reduction rate value is small, and the matching degree of each compressor frequency value, outdoor fan speed value, opening reduction rate value and the outer ring temperature interval is high, and the classification accuracy of the compressor frequency value, outdoor fan speed value and opening reduction rate value is high.

[0073] Exemplarily, at least four outer ring temperature intervals can be set. The at least four outer ring temperature intervals include a first outer ring temperature interval that is less than the first outdoor threshold temperature and greater than or equal to the second outdoor threshold temperature, a second outer ring temperature interval that is less than the second outdoor threshold temperature and greater than or equal to the third outdoor threshold temperature, a third outer ring temperature interval that is less than the third outdoor threshold temperature and greater than or equal to the fourth outdoor threshold temperature, and a fourth outer ring temperature interval that is less than the fourth outdoor threshold temperature and greater than or equal to the fifth outdoor threshold temperature. Among them, the first outdoor threshold temperature, the second outdoor threshold temperature, the third outdoor threshold temperature, the fourth outdoor threshold temperature and the fifth outdoor threshold temperature decrease in sequence. Exemplarily, the first preset temperature can be used as the fifth outdoor threshold temperature; Exemplarily, the first outdoor threshold temperature is less than or equal to 0°C.

[0074] Among them, the compressor frequency value corresponding to the first outer ring temperature interval, the compressor frequency value corresponding to the second outer ring temperature interval, the compressor frequency value corresponding to the third outer ring temperature interval, and the compressor frequency value corresponding to the fourth outer ring temperature interval are decreased in sequence. Exemplarily, the compressor frequency value corresponding to the first outer ring temperature interval is less than or equal to 1.5 times of the first preset frequency, and the compressor frequency value corresponding to the fourth outer ring temperature interval is greater than or equal to 0.3 times of the first preset frequency. The first preset frequency is the default frequency of the compressor set corresponding to the thin frost non-reversing defrosting mode.

[0075] Among them, the outdoor fan speed value corresponding to the first outer ring temperature interval, the outdoor fan speed value corresponding to the second outer ring temperature interval, the outdoor fan speed value corresponding to the third outer ring temperature interval, and the outdoor fan speed value corresponding to the fourth outer ring temperature interval decrease in sequence; exemplarily, the outdoor fan speed value corresponding to the first outer ring temperature interval may be the initial speed of the outdoor fan, that is, the speed of the outdoor fan before entering the thin frost non-reversing defrost mode, the outdoor fan speed value corresponding to the second outer ring temperature interval is greater than or equal to 0.3 times the initial speed of the outdoor fan, the outdoor fan speed value corresponding to the second outer ring temperature interval is less than the initial speed of the outdoor fan, and the outdoor fan speed value corresponding to the fourth outer ring temperature interval may be zero.

[0076] Among them, the opening reduction rate value corresponding to the first outer ring temperature interval, the opening reduction rate value corresponding to the second outer ring temperature interval, the opening reduction rate value corresponding to the third outer ring temperature interval, and the opening reduction rate value corresponding to the fourth outer ring temperature interval increase in sequence. Exemplarily, the opening reduction rate value corresponding to the first outer ring temperature interval, the opening reduction rate value corresponding to the second outer ring temperature interval, the opening reduction rate value corresponding to the third outer ring temperature interval, and the opening reduction rate value corresponding to the fourth outer ring temperature interval are respectively taken between 10pps and 80pps.

[0077] The specific values ​​of the first outdoor threshold temperature, the second outdoor threshold temperature, the third outdoor threshold temperature, the fourth outdoor threshold temperature and the fifth outdoor threshold temperature, as well as the corresponding compressor frequency value, outdoor fan speed value and opening reduction rate value in the light frost non-reversing defrost mode can be determined according to actual needs, and the embodiments of the present application are not limited to this.

[0078] S222: Determine the target frequency of the compressor, the target speed of the outdoor fan, and the opening reduction rate of the electronic expansion valve according to the temperature range. After determining the temperature range in which the outdoor ambient temperature is located, the compressor frequency value, the outdoor fan speed value, and the opening reduction rate value corresponding to the temperature range can be determined, and used as the target frequency of the compressor, the target speed of the outdoor fan, and the opening reduction rate of the electronic expansion valve in the light frost non-reversing defrosting mode.

[0079] S23: Control the indoor fan to gradually change from the initial speed at the speed change rate or remain unchanged, the compressor to operate at the first target frequency, the outdoor fan to operate at the first target speed, and control the electronic expansion valve to operate at the maximum opening for a third preset time and then decrease to the initial opening at the first opening reduction rate. Here, the initial speed is the speed of the indoor fan before entering the thin frost non-reversing defrost mode, and the initial opening is the opening of the electronic expansion valve before entering the thin frost non-reversing defrost mode.

[0080] Exemplarily, the speed change rate can be selected from the first speed change rate value, the second speed change rate value, the third speed change rate value and the fourth speed change rate value. Here, when the speed change rate is less than zero, the indoor fan can be controlled to decrease from the initial speed at the speed change rate; when the speed change rate is zero, the indoor fan can be controlled to maintain the initial speed unchanged; when the speed change rate is greater than zero, the indoor fan can be controlled to increase from the initial speed at the speed change rate.

[0081] Exemplarily, the first target frequency can be selected from the compressor frequency value corresponding to the first outer ring temperature interval, the compressor frequency value corresponding to the second outer ring temperature interval, the compressor frequency value corresponding to the third outer ring temperature interval, and the compressor frequency value corresponding to the fourth outer ring temperature interval. Similarly, the first target speed can be selected from the outdoor fan speed value corresponding to the first outer ring temperature interval, the outdoor fan speed value corresponding to the second outer ring temperature interval, the outdoor fan speed value corresponding to the third outer ring temperature interval, and the outdoor fan speed value corresponding to the fourth outer ring temperature interval. Similarly, the first opening reduction rate can be selected from the opening reduction rate value corresponding to the first outer ring temperature interval, the opening reduction rate value corresponding to the second outer ring temperature interval, the opening reduction rate value corresponding to the third outer ring temperature interval, and the opening reduction rate value corresponding to the fourth outer ring temperature interval.

[0082] like Figure 6 As shown, in some embodiments, after S20 , the defrost control method may include S201 ˜ S202 .

[0083] S201: Determine whether the time from entering the thin frost non-reversing defrosting mode to the time when the outdoor coil temperature reaches 0°C (hereinafter referred to as the first heating time) is greater than or equal to the first threshold time, or determine whether the second preset condition is met. Here, the first threshold time can be pre-set in the control system of the air conditioner 1, and is used to determine the length of time required for the outdoor coil temperature to rise to 0°C during the thin frost non-reversing defrosting process.

[0084] S202: In response to determining that the first temperature rise time is greater than or equal to the first threshold time, or determining that the second preset condition is satisfied, controlling the air conditioner 1 to switch from the light frost non-reversing defrost mode to the medium frost non-reversing defrost mode.

[0085] When it is determined that the first heating time is greater than or equal to the first threshold time, it can be determined that the degree of frost on the outdoor heat exchanger is more serious than the light frost state, and it is necessary to control the air conditioner 1 to switch from the light frost non-reversing defrost mode to the medium frost non-reversing defrost mode. It should be noted that when the degree of frost on the outdoor heat exchanger is in the light frost state and the medium frost state, the attenuation fluctuation of the outdoor coil temperature is small and difficult to monitor accurately, so it is difficult to accurately distinguish the light frost state and the medium frost state based on the attenuation of the outdoor coil temperature; on the contrary, based on the length of time required for the outdoor coil temperature to rise to 0°C during the defrosting process, the light frost state and the medium frost state can be distinguished more accurately, and then the corresponding defrost mode can be accurately and timely adopted for defrosting.

[0086] Similarly, when it is determined that the above second preset condition is met, it can also be determined that the frosting degree of the outdoor heat exchanger is more serious than the light frost state, and the air conditioner 1 needs to be controlled to switch from the light frost non-reversing defrost mode to the medium frost non-reversing defrost mode.

[0087] By setting S201 - S202 , it is possible to switch between the light frost non-reversing defrosting mode and the medium frost non-reversing defrosting mode in a timely manner, thereby improving the heating comfort of the air conditioner 1 .

[0088] like Figure 7 As shown, in some examples, the defrost control method may include S203 to S204 .

[0089] S203: In response to determining that the first heating time is less than the first threshold time, determine a first correction time value according to the first heating time and the first target frequency.

[0090] S204: Correct the third preset duration according to the first correction time value.

[0091] Exemplarily, a number of continuously distributed thin frost heating time intervals and the above-mentioned several outer ring temperature intervals can be pre-set in the control system of the air conditioner 1, and each outer ring temperature interval corresponds to a compressor frequency value, that is, an optional value of the first target frequency, and a corresponding correction time value is set for each combination of the thin frost heating time interval and each compressor frequency value. The number of thin frost heating time intervals and the length of each thin frost heating time interval can be determined according to actual needs, and the embodiment of the present application does not limit this; generally speaking, if the number of thin frost heating time intervals is large, the number of correction time values ​​set is large, the matching degree of each correction time value and the thin frost heating time interval is high, and the classification accuracy of the correction time value is high; similarly, if the length of each thin frost heating time interval is short, the time range corresponding to each correction time value is small, the matching degree of each correction time value and the thin frost heating time interval is high, and the classification accuracy of the correction time value is high.

[0092] Exemplarily, at least five thin frost heating time intervals may be set. The at least five thin frost heating time intervals are respectively a first thin frost heating time interval that is less than a first thin frost time threshold, a second thin frost heating time interval that is greater than or equal to the first thin frost time threshold and less than a second thin frost time threshold, a third thin frost heating time interval that is greater than or equal to the second thin frost time threshold and less than a third thin frost time threshold, a fourth thin frost heating time interval that is greater than or equal to the third thin frost time threshold and less than a fourth thin frost time threshold, and a fifth thin frost heating time interval that is greater than or equal to the fourth thin frost time threshold and less than the first threshold time. The first thin frost time threshold, the second thin frost time threshold, the third thin frost time threshold, the fourth thin frost time threshold and the first threshold time are increased in sequence. Exemplarily, for the same first target frequency, the corrected time value corresponding to the first thin frost heating time interval, the corrected time value corresponding to the second thin frost heating time interval, the corrected time value corresponding to the third thin frost heating time interval, the corrected time value corresponding to the fourth thin frost heating time interval, and the corrected time value corresponding to the fifth thin frost heating time interval decrease in sequence, and the value of each corrected time value can be positive, negative or zero, so that the value of the first corrected time value can be positive, negative or zero.

[0093] In this way, when it is determined that the first heating time is less than the first threshold time, the thin frost heating time interval in which the first heating time is located can be further determined, and then the corresponding correction time value is determined according to the thin frost heating time interval and the first target frequency, and the correction time value is used as the first correction time value and the third preset time length is corrected. Here, when the first correction time value is a positive value, the third preset time length can be positively compensated to increase the third preset time length, so that the time when the electronic expansion valve is operated at the maximum opening when the thin frost is not reversing and defrosting increases. When the first correction time value is a negative value, the third preset time length can be negatively compensated to reduce the third preset time length, so that the time when the electronic expansion valve is operated at the maximum opening when the thin frost is not reversing and defrosting is reduced. When the first correction time value is zero, the third preset time length can be not compensated to maintain the original value of the third preset time length, so that the time when the electronic expansion valve is operated at the maximum opening when the thin frost is not reversing and defrosting remains unchanged.

[0094] By setting S203 to S204, the third preset time length can be timely matched and corrected according to the actual working condition of the air conditioner 1, thereby improving the defrosting effect of the thin frost non-reversing defrosting mode.

[0095] like Figure 8 As shown, in some examples, the defrost control method may include S205 to S206 .

[0096] S205: In response to determining that the first heating time is less than the first threshold time, determine a second correction time value according to the first heating time and the first target frequency.

[0097] S206: Correct the first preset duration according to the second correction time value.

[0098] For example, the thin frost heating time interval in which the first heating time is located can be determined first, and then the second correction time value can be determined according to the thin frost heating time interval and the first target frequency. Here, a number of continuously distributed thin frost heating time intervals and the above-mentioned several outer ring temperature intervals can be pre-set in the control system of the air conditioner 1, and each outer ring temperature interval corresponds to a compressor frequency value, that is, an optional value of the first target frequency, and a corresponding correction time value is set for each combination of the thin frost heating time interval and each compressor frequency value. The number of thin frost heating time intervals and the length of each thin frost heating time interval can be determined according to actual needs, and the embodiment of the present application does not limit this; generally speaking, if the number of thin frost heating time intervals is large, the number of correction time values ​​set is large, the matching degree of each correction time value and the thin frost heating time interval is high, and the classification accuracy of the correction time value is high; similarly, if the length of each thin frost heating time interval is short, the time range corresponding to each correction time value is small, the matching degree of each correction time value and the thin frost heating time interval is high, and the classification accuracy of the correction time value is high.

[0099] Exemplarily, at least four thin frost heating time intervals can be set. The at least four thin frost heating time intervals are respectively a first thin frost heating time interval greater than or equal to the first thin frost time threshold and less than the second thin frost time threshold, a second thin frost heating time interval greater than or equal to the second thin frost time threshold and less than the third thin frost time threshold, a third thin frost heating time interval greater than or equal to the third thin frost time threshold and less than the fourth thin frost time threshold, and a fourth thin frost heating time interval greater than or equal to the fourth thin frost time threshold and less than the first threshold time. Among them, the first thin frost time threshold, the second thin frost time threshold, the third thin frost time threshold, the fourth thin frost time threshold and the first threshold time increase in sequence. Exemplarily, for the same first target frequency, the correction time value corresponding to the first thin frost heating time interval, the correction time value corresponding to the second thin frost heating time interval, the correction time value corresponding to the third thin frost heating time interval, and the correction time value corresponding to the fourth thin frost heating time interval decrease in sequence, and the value of each correction time value can be positive, negative or zero, so that the value of the second correction time value can be positive, negative or zero.

[0100] In this way, when it is determined that the first heating time is less than the first threshold time, the thin frost heating time interval in which the first heating time is located can be further determined, and then the corresponding correction time value is determined according to the thin frost heating time interval and the first target frequency, and it is used as the second correction time value and the first preset time length is corrected. Here, when the second correction time value is a positive value, the first preset time length can be positively compensated to increase the first preset time length, so that the duration required to meet the first preset condition when determining the thin frost state increases, and the threshold condition for the air conditioner 1 to enter the thin frost non-reversing defrosting mode is improved. When the second correction time value is a negative value, the first preset time length can be negatively compensated to reduce the first preset time length, so that the duration required to meet the first preset condition when determining the thin frost state is reduced, and the threshold condition for the air conditioner 1 to enter the thin frost non-reversing defrosting mode is reduced. When the second correction time value is zero, the first preset time length can be not compensated, so that the first preset time length maintains the original value, so that the duration required to meet the first preset condition when determining the thin frost state remains unchanged.

[0101] By setting S205 to S206, the first preset time can be timely matched and corrected according to the actual working condition of the air conditioner 1, thereby improving the accuracy of judging whether the outdoor heat exchanger is in a thin frost state.

[0102] like Fig. 9 As shown, in some embodiments, S30 may include S31-S32.

[0103] S31: determining a second target frequency of the compressor, a second target speed of the outdoor fan, and a second opening reduction rate of the electronic expansion valve according to the outdoor ambient temperature, wherein the second opening reduction rate is greater than zero.

[0104] like Fig.10 As shown, in some examples, S31 may include S311 to S312.

[0105] S311: Determine the temperature range of the outdoor ambient temperature.

[0106] Here, several continuously distributed outer ring temperature intervals can be pre-set in the control system of the air conditioner 1, and the corresponding compressor frequency value, outdoor fan speed value and opening reduction rate value in the medium frost non-reversing defrosting mode can be set for each outer ring temperature interval. The number of outer ring temperature intervals and the length of each outer ring temperature interval can be determined according to actual needs, and the embodiment of the present application does not limit this; generally speaking, if the number of outer ring temperature intervals is large, the number of compressor frequency values, outdoor fan speed values ​​and opening reduction rate values ​​set is large, and the matching degree of each compressor frequency value, outdoor fan speed value, opening reduction rate value and the outer ring temperature interval is high, and the classification accuracy of the compressor frequency value, outdoor fan speed value and opening reduction rate value is high; similarly, if the length of each outer ring temperature interval is short, the temperature range corresponding to each compressor frequency value, outdoor fan speed value and opening reduction rate value is small, and the matching degree of each compressor frequency value, outdoor fan speed value, opening reduction rate value and the outer ring temperature interval is high, and the classification accuracy of the compressor frequency value, outdoor fan speed value and opening reduction rate value is high.

[0107] Exemplarily, at least four outer ring temperature intervals may be set. The at least four outer ring temperature intervals include a sixth outer ring temperature interval less than the sixth outdoor threshold temperature and greater than or equal to the seventh outdoor threshold temperature, a seventh outer ring temperature interval less than the seventh outdoor threshold temperature and greater than or equal to the eighth outdoor threshold temperature, an eighth outer ring temperature interval less than the eighth outdoor threshold temperature and greater than or equal to the ninth outdoor threshold temperature, and a ninth outer ring temperature interval less than the ninth outdoor threshold temperature and greater than or equal to the tenth outdoor threshold temperature. Among them, the sixth outdoor threshold temperature, the seventh outdoor threshold temperature, the eighth outdoor threshold temperature, the ninth outdoor threshold temperature and the tenth outdoor threshold temperature decrease in sequence. Exemplarily, the first preset temperature may be used as the tenth outdoor threshold temperature; Exemplarily, the sixth outdoor threshold temperature is less than or equal to 0°C; Exemplarily, the sixth outdoor threshold temperature may be the same as the first outdoor threshold temperature, the seventh outdoor threshold temperature may be the same as the second outdoor threshold temperature, the eighth outdoor threshold temperature may be the same as the third outdoor threshold temperature, the ninth outdoor threshold temperature may be the same as the fourth outdoor threshold temperature, and the tenth outdoor threshold temperature may be the same as the fifth outdoor threshold temperature.

[0108] Among them, the compressor frequency value corresponding to the sixth outer ring temperature interval, the compressor frequency value corresponding to the seventh outer ring temperature interval, the compressor frequency value corresponding to the eighth outer ring temperature interval, and the compressor frequency value corresponding to the ninth outer ring temperature interval are decreased in sequence. Exemplarily, the compressor frequency value corresponding to the sixth outer ring temperature interval is less than or equal to 1.5 times of the second preset frequency, and the compressor frequency value corresponding to the ninth outer ring temperature interval is greater than or equal to 0.3 times of the second preset frequency, and the second preset frequency is the default frequency of the compressor set corresponding to the medium frost non-reversing defrosting mode.

[0109] Among them, the outdoor fan speed value corresponding to the sixth outer ring temperature interval, the outdoor fan speed value corresponding to the seventh outer ring temperature interval, the outdoor fan speed value corresponding to the eighth outer ring temperature interval, and the outdoor fan speed value corresponding to the ninth outer ring temperature interval decrease in sequence; exemplarily, the outdoor fan speed value corresponding to the sixth outer ring temperature interval may be the initial speed of the outdoor fan, that is, the speed of the outdoor fan before entering the thin frost non-reversing defrost mode, the outdoor fan speed value corresponding to the seventh outer ring temperature interval is greater than or equal to 0.3 times the initial speed of the outdoor fan, the outdoor fan speed value corresponding to the seventh outer ring temperature interval is less than the initial speed of the outdoor fan, and the outdoor fan speed value corresponding to the ninth outer ring temperature interval may be zero.

[0110] Among them, the opening reduction rate value corresponding to the sixth outer ring temperature interval, the opening reduction rate value corresponding to the seventh outer ring temperature interval, the opening reduction rate value corresponding to the eighth outer ring temperature interval, and the opening reduction rate value corresponding to the ninth outer ring temperature interval increase in sequence. Exemplarily, the opening reduction rate value corresponding to the sixth outer ring temperature interval, the opening reduction rate value corresponding to the seventh outer ring temperature interval, the opening reduction rate value corresponding to the eighth outer ring temperature interval, and the opening reduction rate value corresponding to the ninth outer ring temperature interval are respectively taken between 10pps and 80pps.

[0111] The specific values ​​of the sixth outdoor threshold temperature, the seventh outdoor threshold temperature, the eighth outdoor threshold temperature, the ninth outdoor threshold temperature and the tenth outdoor threshold temperature, as well as the corresponding compressor frequency value, outdoor fan speed value and opening reduction rate value in the medium frost non-reversing defrost mode can be determined according to actual needs, and the embodiments of the present application are not limited to this.

[0112] S312: Determine the target frequency of the compressor, the target speed of the outdoor fan, and the opening reduction rate of the electronic expansion valve according to the temperature range. After determining the temperature range in which the outdoor ambient temperature is located, the compressor frequency value, the outdoor fan speed value, and the opening reduction rate value corresponding to the temperature range can be determined, and used as the target frequency of the compressor, the target speed of the outdoor fan, and the opening reduction rate of the electronic expansion valve in the medium frost non-reversing defrosting mode.

[0113] S32: Control the indoor fan to be turned off, the compressor to operate at the second target frequency, the outdoor fan to operate at the second target speed, and control the electronic expansion valve to operate at the maximum opening for a fourth preset time and then decrease to the initial opening at the second opening reduction rate. Here, the initial opening is the opening of the electronic expansion valve before entering the mid-frost non-reversing defrosting mode.

[0114] Exemplarily, the second target frequency can be taken from the compressor frequency value corresponding to the sixth outer ring temperature interval, the compressor frequency value corresponding to the seventh outer ring temperature interval, the compressor frequency value corresponding to the eighth outer ring temperature interval, and the compressor frequency value corresponding to the ninth outer ring temperature interval. Similarly, the second target speed can be taken from the outdoor fan speed value corresponding to the sixth outer ring temperature interval, the outdoor fan speed value corresponding to the seventh outer ring temperature interval, the outdoor fan speed value corresponding to the eighth outer ring temperature interval, and the outdoor fan speed value corresponding to the ninth outer ring temperature interval. Similarly, the second opening reduction rate can be taken from the opening reduction rate value corresponding to the sixth outer ring temperature interval, the opening reduction rate value corresponding to the seventh outer ring temperature interval, the opening reduction rate value corresponding to the eighth outer ring temperature interval, and the opening reduction rate value corresponding to the ninth outer ring temperature interval.

[0115] like Fig.11 As shown, in some embodiments, after S30 , the defrost control method may include S301 ˜ S302 .

[0116] S301: Determine whether the time from entering the medium frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C (hereinafter referred to as the second heating time) is less than the second threshold time, or determine whether the first preset condition is met.

[0117] S302: In response to determining that the second temperature rising time is less than the second threshold time, or determining that the first preset condition is satisfied, controlling the air conditioner 1 to switch from the medium frost non-reversing defrost mode to the light frost non-reversing defrost mode.

[0118] When it is determined that the second heating time is less than the second threshold time, it can be determined that the frost degree of the outdoor heat exchanger is lighter than the medium frost state, closer to or belongs to the thin frost state, and the air conditioner 1 can be controlled to switch from the medium frost non-reversing defrost mode to the thin frost non-reversing defrost mode.

[0119] Similarly, when it is determined that the above-mentioned second preset condition is met, it can also be determined that the degree of frost on the outdoor heat exchanger is lighter than the medium frost state, closer to or belongs to the light frost state, and the air conditioner 1 can be controlled to switch from the medium frost non-reversing defrost mode to the light frost non-reversing defrost mode.

[0120] like Fig.12 As shown, in some embodiments, after S30 , the defrost control method may include S303 - S304 .

[0121] S303: Determine whether the second heating time is greater than or equal to a third threshold time, or determine whether a third preset condition is met.

[0122] S304: In response to determining that the second temperature rise time is greater than or equal to the third threshold time, or determining that the third preset condition is satisfied, controlling the air conditioner 1 to switch from the neutral defrost non-reversing defrost mode to the reverse cycle defrost mode. Here, the third threshold time is greater than the second threshold time.

[0123] When it is determined that the second heating time is greater than or equal to the third threshold time, it can be determined that the frost degree of the outdoor heat exchanger is more serious than the medium frost state, and the air conditioner 1 needs to be controlled to switch from the medium frost non-reversing defrost mode to the reverse cycle defrost mode corresponding to the heavy frost state.

[0124] Similarly, when it is determined that the above third preset condition is met, it can also be determined that the degree of frost on the outdoor heat exchanger is more serious than the medium frost state, and the air conditioner 1 needs to be controlled to switch from the medium frost non-reversing defrost mode to the reverse cycle defrost mode corresponding to the heavy frost state.

[0125] By setting S201 to S202 , it is possible to switch in time between the light frost non-reversing defrost mode, the medium frost non-reversing defrost mode and the reverse cycle defrost mode, thereby improving the heating comfort of the air conditioner 1 .

[0126] like Fig.13 As shown, in some examples, the defrost control method may include S305 - S306 .

[0127] S305: In response to determining that the second heating time is less than the second threshold time and greater than or equal to the third threshold time, determine a third correction time value according to the second heating time and the second target frequency.

[0128] S306: Correct the fourth preset duration according to the third correction time value.

[0129] Exemplarily, several continuously distributed middle frost heating time intervals and the above-mentioned several outer ring temperature intervals can be pre-set in the control system of the air conditioner 1, and each outer ring temperature interval corresponds to a compressor frequency value, that is, an optional value of the second target frequency, and a corresponding correction time value is set for each combination of the middle frost heating time interval and each compressor frequency value. The number of middle frost heating time intervals and the length of each middle frost heating time interval can be determined according to actual needs, and the embodiments of the present application are not limited to this; generally speaking, if the number of middle frost heating time intervals is large, the number of correction time values ​​set is large, the matching degree of each correction time value and the middle frost heating time interval is high, and the classification accuracy of the correction time value is high; similarly, if the length of each middle frost heating time interval is short, the time range corresponding to each correction time value is small, the matching degree of each correction time value and the middle frost heating time interval is high, and the classification accuracy of the correction time value is high.

[0130] Exemplarily, at least four medium frost heating time intervals can be set. The at least four medium frost heating time intervals are respectively a first medium frost heating time interval greater than or equal to the third threshold time and less than the second medium frost time threshold, a second medium frost heating time interval greater than or equal to the second medium frost time threshold and less than the third medium frost time threshold, a third medium frost heating time interval greater than or equal to the third medium frost time threshold and less than the fourth medium frost time threshold, and a fourth medium frost heating time interval greater than or equal to the fourth medium frost time threshold and less than the second threshold time. Among them, the third threshold time, the second medium frost time threshold, the third medium frost time threshold, the fourth medium frost time threshold and the second threshold time increase in sequence. Exemplarily, for the same second target frequency, the correction time value corresponding to the first medium frost heating time interval, the correction time value corresponding to the second medium frost heating time interval, the correction time value corresponding to the third medium frost heating time interval, and the correction time value corresponding to the fourth medium frost heating time interval increase in sequence, and the value of each correction time value can be positive, negative or zero, so that the value of the first correction time value can be positive, negative or zero.

[0131] In this way, when it is determined that the second heating time is less than the second threshold time and greater than or equal to the third threshold time, the middle frost heating time interval in which the second heating time is located can be further determined, and then the corresponding correction time value is determined according to the middle frost heating time interval and the second target frequency, and it is used as the third correction time value and the fourth preset time length is corrected. Here, when the third correction time value is a positive value, the fourth preset time length can be positively compensated to increase the fourth preset time length, so that the time when the electronic expansion valve is operated at the maximum opening when the middle frost is not reversing defrosting increases. When the third correction time value is a negative value, the fourth preset time length can be negatively compensated to reduce the fourth preset time length, so that the time when the electronic expansion valve is operated at the maximum opening when the middle frost is not reversing defrosting is reduced. When the third correction time value is zero, the fourth preset time length can be not compensated, so that the fourth preset time length maintains the original value, so that the time when the electronic expansion valve is operated at the maximum opening when the middle frost is not reversing defrosting remains unchanged.

[0132] By setting S305 to S306, the fourth preset time length can be timely matched and corrected according to the actual working condition of the air conditioner 1, thereby improving the defrosting effect of the medium frost non-reversing defrosting mode.

[0133] like Fig.14 As shown, in some examples, the defrost control method may include S307 - S308 .

[0134] S307: In response to determining that the second heating time is less than the second threshold time and greater than or equal to the third threshold time, determine a fourth correction time value according to the second heating time and the second target frequency.

[0135] S308: Correct the second preset duration according to the fourth correction time value.

[0136] Exemplarily, several continuously distributed middle frost heating time intervals and the above-mentioned several outer ring temperature intervals can be pre-set in the control system of the air conditioner 1, and each outer ring temperature interval corresponds to a compressor frequency value, that is, an optional value of the second target frequency, and a corresponding correction time value is set for each combination of the middle frost heating time interval and each compressor frequency value. The number of middle frost heating time intervals and the length of each middle frost heating time interval can be determined according to actual needs, and the embodiments of the present application are not limited to this; generally speaking, if the number of middle frost heating time intervals is large, the number of correction time values ​​set is large, the matching degree of each correction time value and the middle frost heating time interval is high, and the classification accuracy of the correction time value is high; similarly, if the length of each middle frost heating time interval is short, the time range corresponding to each correction time value is small, the matching degree of each correction time value and the middle frost heating time interval is high, and the classification accuracy of the correction time value is high.

[0137] Exemplarily, at least four medium frost heating time intervals can be set. The at least four medium frost heating time intervals are respectively a first medium frost heating time interval greater than or equal to the third threshold time and less than the second medium frost time threshold, a second medium frost heating time interval greater than or equal to the second medium frost time threshold and less than the third medium frost time threshold, a third medium frost heating time interval greater than or equal to the third medium frost time threshold and less than the fourth medium frost time threshold, and a fourth medium frost heating time interval greater than or equal to the fourth medium frost time threshold and less than the second threshold time. Among them, the third threshold time, the second medium frost time threshold, the third medium frost time threshold, the fourth medium frost time threshold and the second threshold time increase in sequence. Exemplarily, for the same second target frequency, the correction time value corresponding to the first medium frost heating time interval, the correction time value corresponding to the second medium frost heating time interval, the correction time value corresponding to the third medium frost heating time interval, and the correction time value corresponding to the fourth medium frost heating time interval increase in sequence, and the value of each correction time value can be positive, negative or zero, so that the value of the first correction time value can be positive, negative or zero.

[0138] In this way, when it is determined that the second heating time is less than the second threshold time and greater than or equal to the third threshold time, the middle frost heating time interval in which the second heating time is located can be further determined, and then the corresponding correction time value is determined according to the middle frost heating time interval and the second target frequency, and it is used as the fourth correction time value and the second preset time length is corrected. Here, when the fourth correction time value is a positive value, the second preset time length can be positively compensated to increase the second preset time length, so that the duration required to meet the second preset condition when determining the middle frost state increases, and the threshold condition for the air conditioner 1 to enter the middle frost non-reversing defrosting mode is improved. When the fourth correction time value is a negative value, the second preset time length can be negatively compensated to reduce the second preset time length, so that the duration required to meet the second preset condition when determining the middle frost state is reduced, and the threshold condition for the air conditioner 1 to enter the middle frost non-reversing defrosting mode is reduced. When the fourth correction time value is zero, the second preset time length can be not compensated, so that the second preset time length maintains the original value, so that the duration required to meet the second preset condition when determining the middle frost state remains unchanged.

[0139] By setting S307 to S308, the second preset time length can be timely matched and corrected according to the actual working condition of the air conditioner 1, thereby improving the defrosting effect of the medium frost non-reversing defrosting mode.

[0140] In some embodiments, S40 may include S41-S42.

[0141] S41: Determine a third target frequency of the compressor and a target operating state of the outdoor fan according to the outdoor ambient temperature.

[0142] In some examples, S41 may include S411 to S412.

[0143] S411: Determine the temperature range of the outdoor ambient temperature.

[0144] Here, several continuously distributed outer ring temperature intervals can be pre-set in the control system of the air conditioner 1, and the corresponding compressor frequency value and the target operating state of the outdoor fan in the medium frost non-reversing defrosting mode can be set for each outer ring temperature interval. The number of outer ring temperature intervals and the length of each outer ring temperature interval can be determined according to actual needs, and the embodiment of the present application does not limit this; generally speaking, if the number of outer ring temperature intervals is large, the number of compressor frequency values ​​and target operating states of the outdoor fan set is large, the matching degree of each compressor frequency value, the target operating state of the outdoor fan and the outer ring temperature interval is high, and the classification accuracy of the compressor frequency value and the target operating state of the outdoor fan is high; similarly, if the length of each outer ring temperature interval is short, the temperature range corresponding to each and the target operating state of the outdoor fan is small, the matching degree of each compressor frequency value, the target operating state of the outdoor fan and the outer ring temperature interval is high, and the classification accuracy of the compressor frequency value, the outdoor fan speed value and the opening reduction rate value is high.

[0145] Exemplarily, at least three outer ring temperature intervals may be set. The at least three outer ring temperature intervals include an eleventh outer ring temperature interval that is less than the eleventh outdoor threshold temperature, a twelfth outer ring temperature interval that is less than the twelfth outdoor threshold temperature and greater than or equal to the eleventh outdoor threshold temperature, and a thirteenth outer ring temperature interval that is less than the thirteenth outdoor threshold temperature and greater than or equal to the twelfth outdoor threshold temperature. Among them, the eleventh outdoor threshold temperature, the twelfth outdoor threshold temperature, and the thirteenth outdoor threshold temperature increase in sequence. Exemplarily, the first preset temperature may be used as the thirteenth outdoor threshold temperature.

[0146] Among them, the compressor frequency value corresponding to the eleventh outer ring temperature interval, the compressor frequency value corresponding to the twelfth outer ring temperature interval, and the compressor frequency value corresponding to the thirteenth outer ring temperature interval are decreased in sequence. Exemplarily, the compressor frequency value corresponding to the eleventh outer ring temperature interval is less than or equal to 1.5 times of the third preset frequency, and the compressor frequency value corresponding to the thirteenth outer ring temperature interval is greater than or equal to 0.3 times of the third preset frequency, and the third preset frequency is the default frequency of the compressor set corresponding to the reverse cycle defrost mode.

[0147] Among them, the target operating state of the outdoor fan corresponding to the eleventh outer ring temperature interval and the twelfth outer ring temperature interval is that the outdoor fan remains stopped, and the target operating state of the outdoor fan corresponding to the thirteenth outer ring temperature interval is that the outdoor fan maintains the initial speed, that is, the speed of the outdoor fan before entering the reverse cycle defrost mode.

[0148] Furthermore, the outdoor ambient humidity may be considered in at least part of the outer ring temperature interval to determine the third target frequency of the compressor and the target operating state of the outdoor fan. For example, the outdoor ambient humidity may be considered in the twelfth outer ring temperature interval; when the outdoor ambient temperature is in the twelfth outer ring temperature interval and the outdoor ambient humidity is greater than or equal to the above-mentioned preset humidity, the corresponding compressor frequency value may be set to be the same as the compressor frequency value corresponding to the eleventh outer ring temperature interval, and the outdoor fan is kept stopped; when the outdoor ambient temperature is in the twelfth outer ring temperature interval and the outdoor ambient humidity is less than the above-mentioned preset humidity, the corresponding compressor frequency value may be set to be less than the compressor frequency value corresponding to the eleventh outer ring temperature interval, and the outdoor fan is kept stopped.

[0149] S42: Control the compressor to stop, the reversing valve to reverse, and the indoor fan to gradually turn off. After the reversing valve is reversed, the compressor is controlled to operate at a third target frequency and the outdoor fan to operate at a target operating state.

[0150] In a second aspect, an embodiment of the present application provides a defrost control device, which includes: a frost judgment circuit, configured to determine the degree of frost on an outdoor heat exchanger; a first defrost circuit, configured to control the air conditioner to enter a thin frost non-reversing defrost mode in response to determining that the outdoor heat exchanger is in a thin frost state; a second defrost circuit, configured to control the air conditioner to enter a medium frost non-reversing defrost mode in response to determining that the outdoor heat exchanger is in a medium frost state; a third defrost circuit, configured to control the air conditioner to enter a reverse cycle defrost mode in response to determining that the outdoor heat exchanger is in a heavy frost state.

[0151] like Fig.15 As shown, in the third aspect, an embodiment of the present application provides an air conditioner 1, including a processor 10 and a memory 20, the memory 20 stores a computer program, and when the computer program is executed by the processor 10, the defrost control method provided in any of the above embodiments is implemented.

[0152] The processor 10 is connected to the memory 20, and can perform various actions and processes according to the program stored in the memory 20. Specifically, the processor 10 can be an integrated circuit chip with signal processing capabilities. The above-mentioned processor 10 can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc., which can be an X86 architecture or an ARM architecture.

[0153] The memory 20 may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronously linked dynamic random access memory (SLDRAM), and direct memory bus random access memory (DRRAM). It should be noted that the memory 20 of the method described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0154] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium on which a computer program is stored. The computer program is loaded by the processor 10 to execute the steps in the control method of any of the above embodiments.

[0155] Exemplarily, the above-mentioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (e.g., CDs (Compact Disks), DVDs (Digital Versatile Disks), etc.), smart cards and flash memory devices (e.g., EPROMs (Erasable Programmable Read-Only Memory), cards, sticks or key drives, etc.). The various computer-readable storage media described in the embodiments of the present application may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data.

[0156] The above is a detailed introduction to a defrost control method, device, air conditioner and computer-readable storage medium provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A defrosting control method, characterized in that: include: Determine the degree of frost on the outdoor heat exchanger; In response to determining that the outdoor heat exchanger is in a thin frost state, controlling the air conditioner to enter a thin frost non-reversing defrost mode; In response to determining that the outdoor heat exchanger is in a medium frost state, controlling the air conditioner to enter a medium frost non-reversing defrost mode; In response to determining that the outdoor heat exchanger is in a heavy frosted state, the air conditioner is controlled to enter a reverse cycle defrost mode.

2. The defrosting control method according to claim 1, characterized in that: Determine the degree of frost on the outdoor heat exchanger, including: In response to determining that the duration of satisfying the first preset condition is greater than the first preset duration, determining that the outdoor heat exchanger is in a thin frost state; In response to determining that the duration of satisfying the second preset condition is greater than the second preset duration, determining that the outdoor heat exchanger is in a medium frost state; In response to determining that the third preset condition is satisfied, determining that the outdoor heat exchanger is in a heavy frost state; The first preset condition is: the outdoor ambient temperature is greater than or equal to the first preset temperature and less than 0°C, the outdoor ambient humidity is less than the preset humidity, and the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is less than the first preset temperature difference; The second preset condition is: the outdoor ambient temperature is greater than or equal to the first preset temperature and less than 0°C, the outdoor ambient humidity is less than the preset humidity, and the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is greater than or equal to the first preset temperature difference and less than the second preset temperature difference; The third preset condition is: the outdoor ambient temperature is lower than the first preset temperature, or the outdoor ambient humidity is greater than or equal to the preset humidity, or the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is greater than or equal to the second preset temperature difference; The first preset time length is shorter than the second preset time length, and the first preset temperature difference is shorter than the second preset temperature difference.

3. The defrosting control method according to claim 1, characterized in that: Control the air conditioner to enter the light frost non-reversing defrost mode, including: Determining a speed change rate of the indoor fan according to the indoor coil temperature, wherein an absolute value of the speed change rate is greater than or equal to zero; Determine a first target frequency of the compressor, a first target speed of the outdoor fan, and a first opening reduction rate of the electronic expansion valve according to the outdoor ambient temperature, wherein the opening reduction rate is less than zero; Controlling the indoor fan to gradually change from an initial speed at the speed change rate or maintain unchanged, the compressor to operate at the first target frequency, the outdoor fan to operate at the first target speed, and controlling the electronic expansion valve to operate at the maximum opening for a third preset time and then decrease to the initial opening at the first opening reduction rate; The initial rotation speed is the rotation speed of the indoor fan before entering the thin frost non-reversing defrost mode, and the initial opening degree is the opening degree of the electronic expansion valve before entering the thin frost non-reversing defrost mode.

4. The defrost control method according to any one of claims 1 to 3, characterized in that: After controlling the air conditioner to enter the light frost non-reversing defrosting mode, the defrosting control method includes: Determine whether the time from entering the light frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0° C. is greater than or equal to a first threshold time, or determine whether a second preset condition is met; In response to determining that the time elapsed from entering the light frost non-reversing defrost mode to the outdoor coil temperature reaching 0°C is greater than or equal to a first threshold time, or determining that a second preset condition is met, the air conditioner is controlled to switch from the light frost non-reversing defrost mode to the medium frost non-reversing defrost mode.

5. The defrosting control method according to claim 4, characterized in that: Controlling the air conditioner to enter the thin frost non-reversing defrost mode includes: determining the speed change rate of the indoor fan according to the indoor coil temperature, the absolute value of the speed change rate is greater than or equal to zero; determining the first target frequency of the compressor, the first target speed of the outdoor fan and the first opening reduction rate of the electronic expansion valve according to the outdoor ambient temperature, the opening reduction rate is less than zero; controlling the indoor fan to gradually change from the initial speed at the speed change rate or maintain unchanged, the compressor to operate at the first target frequency, the outdoor fan to operate at the first target speed, and controlling the electronic expansion valve to operate at the maximum opening for a third preset time and then reduce to the initial opening at the first opening reduction rate; The defrost control method comprises: In response to determining that the time elapsed from entering the light frost non-reversing defrost mode to when the outdoor coil temperature reaches 0° C. is less than a first threshold time, determining a first corrected time value according to the time elapsed from entering the light frost non-reversing defrost mode to when the outdoor coil temperature reaches 0° C. and the first target frequency; The third preset duration is corrected according to the first corrected time value.

6. The defrosting control method according to claim 4, characterized in that: Determining the degree of frost on the outdoor heat exchanger includes: in response to determining that the duration of satisfying the first preset condition is greater than the first preset duration, determining that the outdoor heat exchanger is in a thin frost state; The defrost control method comprises: In response to determining that the time elapsed from entering the light frost non-reversing defrost mode to when the outdoor coil temperature reaches 0° C. is less than a first threshold time, determining a second corrected time value according to the time elapsed from entering the light frost non-reversing defrost mode to when the outdoor coil temperature reaches 0° C. and the first target frequency; The first preset duration is corrected according to the second corrected time value.

7. The defrosting control method according to claim 1, characterized in that: Control the air conditioner to enter the medium frost non-reversing defrost mode, including: Determine a second target frequency of the compressor, a second target speed of the outdoor fan, and a second opening reduction rate of the electronic expansion valve according to the outdoor ambient temperature, wherein the second opening reduction rate is greater than zero; Controlling the indoor fan to be turned off, the compressor to operate at the second target frequency, the outdoor fan to operate at the second target speed, and controlling the electronic expansion valve to operate at the maximum opening for a fourth preset time and then decrease to the initial opening at the second opening reduction rate; The initial opening is the opening of the electronic expansion valve before entering the medium frost non-reversing defrosting mode.

8. The defrosting control method according to claim 1 or 7, characterized in that: After controlling the air conditioner to enter the medium frost non-reversing defrosting mode, the defrosting control method includes: Determine whether the time from entering the medium frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is less than a second threshold time, or determine whether the first preset condition is met; In response to determining that the time elapsed from entering the medium frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0° C. is less than a second threshold time, or determining that a first preset condition is satisfied, controlling the air conditioner to switch from the medium frost non-reversing defrost mode to the light frost non-reversing defrost mode; and / or; Determine whether the time from entering the medium frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0° C. is greater than or equal to a third threshold time, or determine whether a third preset condition is met; In response to determining that the time elapsed from entering the medium frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0° C. is greater than or equal to a third threshold time, or determining that a third preset condition is satisfied, controlling the air conditioner to switch from the medium frost non-reversing defrost mode to the reverse cycle defrost mode; The third threshold time is greater than the second threshold time.

9. The defrosting control method according to claim 8, characterized in that: Controlling the air conditioner to enter the medium frost non-reversing defrost mode includes: determining a second target frequency of the compressor, a second target speed of the outdoor fan, and a second opening reduction rate of the electronic expansion valve according to the outdoor ambient temperature, wherein the second opening reduction rate is greater than zero; controlling the indoor fan to be turned off, the compressor to operate at the second target frequency, the outdoor fan to operate at the second target speed, and controlling the electronic expansion valve to operate at the maximum opening for a fourth preset time and then reduce the opening to the initial opening at the second opening reduction rate; The defrost control method comprises: In response to determining that the time elapsed from entering the mid-frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is less than the second threshold time and greater than or equal to the third threshold time, determining a third corrected time value according to the time elapsed from entering the mid-frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C and the second target frequency; The fourth preset duration is corrected according to the third corrected time value.

10. The defrosting control method according to claim 8, characterized in that: Determining the degree of frost on the outdoor heat exchanger includes: in response to determining that the duration of satisfying the second preset condition is greater than the second preset duration, determining that the outdoor heat exchanger is in a medium frost state; The defrost control method comprises: In response to determining that the time elapsed from entering the mid-frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C is less than the second threshold time and greater than or equal to the third threshold time, determining a fourth corrected time value according to the time elapsed from entering the mid-frost non-reversing defrost mode to the time when the outdoor coil temperature reaches 0°C and the second target frequency; The second preset duration is corrected according to the fourth corrected time value.

11. A defrost control device, characterized in that: include: a frost determination circuit configured to determine a degree of frost on the outdoor heat exchanger; A first defrosting circuit is configured to control the air conditioner to enter a thin frost non-reversing defrosting mode in response to determining that the outdoor heat exchanger is in a thin frost state; a second defrosting circuit configured to control the air conditioner to enter a medium frost non-reversing defrosting mode in response to determining that the outdoor heat exchanger is in a medium frost state; The third defrost circuit is configured to control the air conditioner to enter a reverse cycle defrost mode in response to determining that the outdoor heat exchanger is in a heavy frosted state.

12. An air conditioner, characterized in that: include: a memory storing a computer program; A processor, wherein when the computer program is executed by the processor, the defrost control method according to any one of claims 1 to 10 is implemented.

13. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and the computer program is loaded by a processor to execute the steps in the defrost control method according to any one of claims 1 to 10.

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