Defrost control method, device, air conditioner and computer-readable storage medium

Abstract

This application provides a defrosting control method, apparatus, air conditioner, and computer-readable storage medium. The defrosting control method includes: determining the degree of frost on the outdoor heat exchanger; controlling the air conditioner to enter a thin frost non-reversing defrosting mode in response to determining that the outdoor heat exchanger is in a light frost state; controlling 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; and controlling the air conditioner to enter a reverse circulation defrosting mode in response to determining that the outdoor heat exchanger is in a heavy frost state.

Description

Technical Field

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

[0002] When an air conditioner is heating in a low-temperature environment, the outdoor heat exchanger is prone to frosting, which reduces its heating performance. In related technologies, air conditioners typically need to perform reverse circulation defrosting frequently. When performing reverse circulation defrosting, the air conditioner needs to stop heating, resulting in poor heating effect. Summary of the Invention

[0003] This application provides a defrosting control method, apparatus, air conditioner, and computer-readable storage medium, which can avoid the air conditioner from frequently performing reverse defrosting and improve the heating effect of the air conditioner.

[0004] In a first aspect, embodiments of this application provide a defrosting control method, comprising: determining the degree of frost on an 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 defrosting 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 defrosting mode; and in response to determining that the outdoor heat exchanger is in a heavy frost state, controlling the air conditioner to enter a reverse circulation defrosting mode.

[0005] In some embodiments, determining the degree of frost on the outdoor heat exchanger includes: determining that the outdoor heat exchanger is in a thin frost state in response to determining that the duration of satisfying a first preset condition is greater than a first preset duration; determining that the outdoor heat exchanger is in a medium frost state in response to determining that the duration of satisfying a second preset condition is greater than a second preset duration; and determining that the outdoor heat exchanger is in a heavy frost state in response to determining that a third preset condition is satisfied. The first preset condition is: the outdoor ambient temperature is greater than or equal to a first preset temperature and less than 0°C, the outdoor ambient humidity is less than a preset humidity, and the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is less than a 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 a preset humidity, and the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is greater than or equal to a first preset temperature difference and less than a 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 a 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 duration is less than the second preset duration, 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 the rate of change of the indoor fan speed based on the indoor coil temperature, wherein the absolute value of the rate of change of the speed 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 rate of decrease in the opening of the electronic expansion valve based on the outdoor ambient temperature, wherein the rate of decrease in the opening is less than zero; controlling the indoor fan to gradually change or remain constant at the rate of change of the speed from an initial speed, 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 its maximum opening for a third preset time before decreasing to its initial opening at the first rate of decrease in opening; wherein 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 the thin frost non-reversing defrost mode, the defrost control method includes: determining whether the time elapsed from entering the thin frost non-reversing defrost mode to 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 thin frost non-reversing defrost mode to 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 thin frost non-reversing defrost mode to the medium frost non-reversing defrost mode.

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

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

[0010] In some embodiments, controlling the air conditioner to enter the mid-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 based on the outdoor ambient temperature, wherein the second opening reduction rate is greater than zero; controlling the indoor fan to shut down, 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 its maximum opening for a fourth preset time and then reduce its opening to its initial opening at the second opening reduction rate; wherein the initial opening is the opening of the electronic expansion valve before entering the mid-frost non-reversing defrost mode.

[0011] In some embodiments, after controlling the air conditioner to enter the mid-frost non-reversing defrosting mode, the defrosting control method includes: determining whether the time elapsed from entering the mid-frost non-reversing defrosting mode until 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 mid-frost non-reversing defrosting mode until 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 mid-frost non-reversing defrosting mode to the thin frost non-reversing defrosting mode.

[0012] In some embodiments, after controlling the air conditioner to enter the non-reversing defrost mode, the defrost control method includes: determining whether the time elapsed from entering the non-reversing defrost mode until 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 non-reversing defrost mode until 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 non-reversing defrost mode to the reverse circulation defrost mode; wherein the third threshold time is greater than the second threshold time.

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

[0015] Secondly, embodiments of this application provide a defrosting control device, comprising: a frost determination circuit configured to determine the degree of frost on an outdoor heat exchanger; a first defrosting circuit 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; and a third defrosting circuit configured to control the air conditioner to enter a reverse circulation defrosting mode in response to determining that the outdoor heat exchanger is in a heavy frost state.

[0016] Thirdly, embodiments of this application provide an air conditioner, including: a memory storing a computer program; and a processor, wherein the computer program, when executed by the processor, implements the defrosting control method described in any of the above embodiments.

[0017] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to execute the steps in the defrosting control method described above.

[0018] The defrosting control method provided in this application first determines the degree of frost on the outdoor heat exchanger, and then adopts different defrosting modes according to the degree of frost on the outdoor heat exchanger. When the frost is light, a light frost non-reversing defrosting mode is used; when the frost is moderate, a moderate frost non-reversing defrosting mode is used; and only when the frost is heavy, a reverse circulation defrosting mode is used. This avoids the air conditioner from frequently performing reverse circulation defrosting and improves the heating effect of the air conditioner. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of a defrosting control method provided in some embodiments of this application;

[0021] Figure 2This is a partial flowchart of a defrosting control method provided in some embodiments of this application;

[0022] Figure 3 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0023] Figure 4 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0024] Figure 5 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0025] Figure 6 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0026] Figure 7 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0027] Figure 8 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0028] Figure 9 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0029] Figure 10 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0030] Figure 11 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0031] Figure 12 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0032] Figure 13 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0033] Figure 14 This is another partial flowchart of the defrosting control method provided in some embodiments of this application;

[0034] Figure 15 This is a structural diagram of an air conditioner provided in some embodiments of this application.

[0035] Explanation of key component symbols:

[0036] 1-Air conditioner, 10-Processor, 20-Memory. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[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 "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0041] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0042] like Figure 1 As shown, in a first aspect, embodiments of this application provide a defrosting control method, which includes S10 to S40, which can avoid the air conditioner 1 from frequently performing reverse circulation defrosting and improve the heating effect of the air conditioner 1.

[0043] S10: Determine the degree of frost on the outdoor heat exchanger. Here, the degree of frost on the outdoor heat exchanger can include thin frost, medium frost, and heavy frost. The frost thickness in the thin frost state, the frost thickness in the medium frost state, and the frost thickness in the heavy frost state increase sequentially.

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

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

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

[0047] When the outdoor heat exchanger is determined to be in a mid-frost state, it indicates that the degree of frost on the outdoor heat exchanger is moderate and will not significantly affect the heating performance of air conditioner 1. At this time, air conditioner 1 can be controlled to not perform reverse circulation defrosting, but instead enter the mid-frost non-reversing defrosting mode corresponding to the mid-frost state setting. When air conditioner 1 enters the mid-frost non-reversing defrosting mode, the reversing valve does not need to reverse; instead, the defrosting effect is achieved by controlling parameters such as compressor frequency, outdoor fan speed, and the opening degree of the electronic expansion valve. During this time, the refrigerant in air conditioner 1 remains in heating operation without stopping heating. Here, the operating parameters such as compressor frequency, outdoor fan speed, and electronic expansion valve opening are different for the light frost non-reversing defrosting mode and the mid-frost non-reversing defrosting mode to meet different defrosting needs.

[0048] S40: In response to determining that the outdoor heat exchanger is in a heavy frost state, control the air conditioner 1 to enter the reverse circulation defrost mode.

[0049] When it is determined that the outdoor heat exchanger is in a state of heavy frosting, it indicates that the degree of frost buildup on the outdoor heat exchanger is quite severe and has significantly affected the heating performance of air conditioner 1. At this time, it is necessary to control air conditioner 1 to enter the reverse circulation defrosting mode to remove the frost layer on the outdoor heat exchanger as soon as possible. When air conditioner 1 enters the reverse circulation defrosting mode, the reversing valve needs to be reversed, and the refrigerant in air conditioner 1 switches to cooling operation, causing air conditioner 1 to temporarily stop heating.

[0050] Compared with related technologies, the defrosting control method provided in this application first determines the degree of frost on the outdoor heat exchanger, and adopts different defrosting modes according to the severity of the frost on the outdoor heat exchanger. When the frost is thin, a thin frost non-reversing defrosting mode is adopted; when the frost is medium, a medium frost non-reversing defrosting mode is adopted; and only when the frost is heavy, a reverse circulation defrosting mode is adopted. This avoids the air conditioner 1 from frequently performing reverse circulation defrosting and improves the heating effect of the air conditioner 1.

[0051] The specific steps for determining the degree of frost formation on the outdoor heat exchanger can be determined according to actual needs, and this application does not limit this. For example... Figure 2 As shown, in some embodiments, S10 may include S11 to S13.

[0052] S11: In response to determining that the duration of satisfying the first preset condition is greater than the first preset duration, determine 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℃, 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 all three conditions are met simultaneously, it can be determined that the first preset condition is met; when the above three conditions are not met simultaneously, it can be determined that the first preset condition is not met.

[0054] Here, the duration for which air conditioner 1 remains in a state that meets the first preset condition can be monitored, and the duration can be compared with the first preset duration. If the duration is determined to be longer than the first preset duration, it can be determined that the outdoor heat exchanger is in a thin frost state.

[0055] S12: In response to determining that the duration of satisfying the second preset condition is greater than the second preset duration, determine that the outdoor heat exchanger is in a mid-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℃; 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 duration is less than the second preset duration, and the first preset temperature difference is less than the second preset temperature difference. When all three conditions are met simultaneously, the second preset condition is determined to be satisfied; when none of the three conditions are met simultaneously, the second preset condition is determined to be unsatisfactory.

[0057] Here, the duration for which the air conditioner 1 remains in a state that meets the second preset condition can be monitored, and the duration can be compared with the second preset duration. When it is determined that the duration is longer than the second preset duration, the outdoor heat exchanger is determined to be in a thin frost state. Here, the first preset duration and the second preset duration can be the same value or different values, and this embodiment of the application does not limit this.

[0058] S13: In response to determining that the third preset condition is met, determine 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. If any one of these conditions is met, the third preset condition is determined to be met; if any one of these conditions is not met, the third preset condition is determined to be not met.

[0060] By setting S11~S13, the degree of frost on the outdoor heat exchanger can be determined more accurately, and the corresponding defrosting mode can be adopted accurately and in a timely manner, thereby increasing the control precision and avoiding frequent reverse circulation defrosting of the air conditioner 1, thus improving the heating effect of the air conditioner 1.

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

[0062] S21: Determine the rate of change of indoor fan speed based on the indoor coil temperature. Here, the indoor coil temperature is the temperature of the heat exchange coil on the indoor heat exchanger; the rate of change of speed 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~S212.

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

[0065] Here, several continuously distributed inner disk temperature ranges can be pre-set in the control system of air conditioner 1, and a corresponding speed change rate value can be set for each inner disk temperature range. The number of inner disk temperature ranges and the length of each inner disk temperature range can be determined according to actual needs, and this embodiment does not limit this. Generally speaking, if there are more inner disk temperature ranges, there will be more speed change rate values ​​set, the matching degree between each speed change rate value and the inner disk temperature range will be higher, and the grading accuracy of the speed change rate values ​​will be higher. Similarly, if the length of each inner disk temperature range is shorter, the temperature range corresponding to each speed change rate value will be smaller, the matching degree between each speed change rate value and the inner disk temperature range will be higher, and the grading accuracy of the speed change rate values ​​will be higher. For example, at least four inner disk temperature ranges can be set. The at least four inner disk temperature ranges are a first inner disk temperature range greater than or equal to a first inner disk threshold temperature, a second inner disk temperature range greater than or equal to a second inner disk threshold temperature and less than a first inner disk threshold temperature, a third inner disk temperature range greater than or equal to a third inner disk threshold temperature and less than a second inner disk threshold temperature, and a fourth inner disk temperature range less than a third inner disk threshold temperature. Wherein, 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 rotational speed change rate can be determined according to actual needs, and this application embodiment does not limit them.

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

[0067] After determining the temperature range of the indoor coil temperature, the corresponding rotational speed change rate can be determined and used as the rotational speed change rate of the indoor fan. For example, at least four indoor coil temperature ranges can be set as described above, and at least four corresponding rotational speed change rate values ​​can be set, with one rotational speed change rate value set for each indoor coil temperature range. At least four speed change rate values ​​are provided, including 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 corresponds to a first inner disk temperature range, the second speed change rate value corresponds to a second inner disk temperature range, the third speed change rate value corresponds to a third inner disk temperature range, and the fourth speed change rate value corresponds to a fourth inner disk temperature range. The first speed change rate value is a positive value greater than zero, used to increase the speed of the indoor fan. The second speed change rate value is zero, used to keep the speed of the indoor fan constant. The third speed change rate value is a negative value less than zero, 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, used to decrease the speed of the indoor fan more quickly.

[0068] For example, S21 may include: determining the indoor fan speed change rate, the pitch angle of the air guide vane, the opening and closing status of the left and right sweeping blades, and the operating status of the electric auxiliary heating device based on the indoor coil temperature. Furthermore, at least four inner coil temperature ranges can be set as described above, and corresponding indoor fan speed change rate, air guide vane pitch angle, left and right sweeping blade opening and closing status, and electric auxiliary heating device operating status can be set for each outer coil temperature range. For example, corresponding to the first and second inner plate temperature ranges, the pitch angle of the air guide plate is the same as the angle before entering the thin frost non-reversing defrosting mode. That is, the pitch angle of the air guide plate is not adjusted, the left and right sweeping blades remain open for left and right sweeping, and the electric auxiliary heating device remains closed and does not provide electric auxiliary heating. Corresponding to the third inner plate temperature range, the pitch angle of the air guide plate is adjusted to the first air guide angle, so that the air guide plate guides air upward at least partially, avoiding the air guide plate blowing downward air that feels cold to the touch. The left and right sweeping blades are closed to stop left and right sweeping, and the electric auxiliary heating device remains closed and does not provide electric auxiliary heating. Corresponding to the fourth inner plate temperature range, the pitch angle of the air guide plate is adjusted to the second air guide angle, so that the air guide plate guides air upward as a whole, avoiding the air guide plate blowing downward air that feels cold to the touch. The left and right sweeping blades are closed to stop left and right 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 based on 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 to S222.

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

[0072] Here, several continuously distributed outer ring temperature ranges can be pre-set in the control system of air conditioner 1, and corresponding compressor frequency values, outdoor fan speed values, and opening reduction rate values ​​can be set for each outer ring temperature range in the thin frost non-reversing defrost mode. The number of outer ring temperature ranges and the length of each outer ring temperature range can be determined according to actual needs, and this embodiment does not limit this. Generally speaking, if there are more outer ring temperature ranges, there will be more compressor frequency values, outdoor fan speed values, and opening reduction rate values ​​set, and the matching degree between each compressor frequency value, outdoor fan speed value, opening reduction rate value, and outer ring temperature range will be higher, and the classification accuracy of the compressor frequency value, outdoor fan speed value, and opening reduction rate value will be higher. Similarly, if the length of each outer ring temperature range is shorter, the temperature range corresponding to each compressor frequency value, outdoor fan speed value, and opening reduction rate value will be smaller, and the matching degree between each compressor frequency value, outdoor fan speed value, opening reduction rate value, and outer ring temperature range will be higher, and the classification accuracy of the compressor frequency value, outdoor fan speed value, and opening reduction rate value will be higher.

[0073] For example, at least four outer ring temperature ranges can be set. These at least four outer ring temperature ranges include a first outer ring temperature range that is less than a first outdoor threshold temperature and greater than or equal to a second outdoor threshold temperature; a second outer ring temperature range that is less than the second outdoor threshold temperature and greater than or equal to a third outdoor threshold temperature; a third outer ring temperature range that is less than the third outdoor threshold temperature and greater than or equal to a fourth outdoor threshold temperature; and a fourth outer ring temperature range that is less than the fourth outdoor threshold temperature and greater than or equal to a fifth outdoor threshold temperature. The first, second, third, fourth, and fifth outdoor threshold temperatures decrease sequentially. For example, a first preset temperature can be used as the fifth outdoor threshold temperature; for example, the first outdoor threshold temperature is less than or equal to 0°C.

[0074] The compressor frequency values ​​corresponding to the first outer ring temperature range, the second outer ring temperature range, the third outer ring temperature range, and the fourth outer ring temperature range decrease sequentially. For example, the compressor frequency value corresponding to the first outer ring temperature range is less than or equal to 1.5 times the first preset frequency, and the compressor frequency value corresponding to the fourth outer ring temperature range is greater than or equal to 0.3 times the first preset frequency. The first preset frequency is the default compressor frequency set for the thin frost non-reversing defrost mode.

[0075] The outdoor fan speed values ​​corresponding to the first outer ring temperature range, the second outer ring temperature range, the third outer ring temperature range, and the fourth outer ring temperature range decrease sequentially. For example, the outdoor fan speed value corresponding to the first outer ring temperature range can be the initial speed of the outdoor fan, that is, the speed of the outdoor fan before entering the thin frost non-reversing defrosting mode; the outdoor fan speed value corresponding to the second outer ring temperature range 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 range is less than the initial speed of the outdoor fan; and the outdoor fan speed value corresponding to the fourth outer ring temperature range can be zero.

[0076] Specifically, the rate of decrease in opening for the first outer ring temperature range, the second outer ring temperature range, the third outer ring temperature range, and the fourth outer ring temperature range increase sequentially. For example, the rate of decrease in opening for the first, second, third, and fourth outer ring temperature ranges is taken between 10 pps and 80 pps.

[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 compressor frequency value, the outdoor fan speed value, and the opening reduction rate value corresponding to the thin frost non-reversing defrosting mode, can be determined according to actual needs, and this application embodiment does not limit them.

[0078] S222: Determine the target frequency of the compressor, the target speed of the outdoor fan, and the rate of decrease in the opening of the electronic expansion valve based on the temperature range. After determining the temperature range in which the outdoor ambient temperature is located, the compressor frequency value, outdoor fan speed value, and opening reduction rate value corresponding to that 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 thin frost non-reversing defrosting mode.

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

[0080] For example, the speed change rate can be selected from the first, second, third, and fourth speed change rate values ​​mentioned above. 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; 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] For example, the first target frequency can be selected from the compressor frequency values ​​corresponding to the first, second, third, and fourth outer ring temperature ranges. Similarly, the first target rotational speed can be selected from the outdoor fan rotational speed values ​​corresponding to the first, second, third, and fourth outer ring temperature ranges. Likewise, the first opening reduction rate can be selected from the opening reduction rate values ​​corresponding to the first, second, third, and fourth outer ring temperature ranges.

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

[0083] S201: Determine whether the time elapsed from entering the thin frost non-reversing defrost mode until the outdoor coil temperature reaches 0℃ (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 preset in the control system of the air conditioner 1 to determine the length of time required for the outdoor coil temperature to rise to 0℃ during the thin frost non-reversing defrost process.

[0084] S202: In response to determining that the first heating time is greater than or equal to the first threshold time, or determining that the second preset condition is met, control the air conditioner 1 to switch from the thin frost non-reversing defrosting mode to the medium frost non-reversing defrosting mode.

[0085] When the first temperature rise time is greater than or equal to the first threshold time, it can be determined that the frost level on the outdoor heat exchanger is more severe than the thin frost state. Therefore, it is necessary to switch air conditioner 1 from the thin frost non-reversing defrosting mode to the medium frost non-reversing defrosting mode. It should be noted that when the frost level on the outdoor heat exchanger is in the thin frost or medium frost state, the temperature drop of the outdoor coil is relatively small and difficult to monitor accurately. Therefore, it is difficult to accurately distinguish between the thin frost and medium frost states based on the temperature drop of the outdoor coil. Conversely, based on the time required for the outdoor coil temperature to rise to 0℃ during the defrosting process, the thin frost and medium frost states can be distinguished more accurately, allowing for accurate and timely application of the appropriate defrosting mode.

[0086] Similarly, when the second preset condition is met, it can also be determined that the degree of frost on the outdoor heat exchanger is more severe than the thin frost state, and it is necessary to control the air conditioner 1 to switch from the thin frost non-reversing defrosting mode to the medium frost non-reversing defrosting mode.

[0087] By setting S201~S202, the system can switch between the thin 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 defrosting control method may include S203~S204.

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

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

[0091] For example, several continuously distributed frost-raising time intervals and the aforementioned several outer ring temperature intervals can be pre-set in the control system of air conditioner 1. Each outer ring temperature interval corresponds to a compressor frequency value, i.e., an optional value of the first target frequency, and a corresponding correction time value is set for each combination of frost-raising time interval and each compressor frequency value. The number of frost-raising time intervals and the length of each frost-raising time interval can be determined according to actual needs, and this application embodiment does not limit this. Generally speaking, if there are more frost-raising time intervals, there are more correction time values ​​set, the matching degree between each correction time value and the frost-raising time interval is higher, and the classification accuracy of the correction time value is higher. Similarly, if the length of each frost-raising time interval is shorter, the time range corresponding to each correction time value is smaller, the matching degree between each correction time value and the frost-raising time interval is higher, and the classification accuracy of the correction time value is higher.

[0092] For example, at least five thin-frost warming time intervals can be set. These intervals are: a first thin-frost warming time interval less than a first thin-frost time threshold; a second thin-frost warming time interval greater than or equal to the first thin-frost time threshold and less than a second thin-frost time threshold; a third thin-frost warming time interval greater than or equal to the second thin-frost time threshold and less than a third thin-frost time threshold; a fourth thin-frost warming time interval 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 warming time interval greater than or equal to the fourth thin-frost time threshold and less than the first threshold time. The first, second, third, and fourth thin-frost time thresholds increase sequentially with the first threshold time. For example, for the same first target frequency, the correction time values ​​corresponding to the first thin frost heating time interval, the second thin frost heating time interval, the third thin frost heating time interval, the fourth thin frost heating time interval, and the fifth thin frost heating time interval decrease sequentially, and each correction time value can be positive, negative, or zero, so that the first correction time value can be positive, negative, or zero.

[0093] Thus, when it is determined that the first heating time is less than the first threshold time, the frost heating time interval within which the first heating time falls can be further determined. Then, based on this frost heating time interval and the first target frequency, a corresponding correction time value can be determined, which is used as the first correction time value to correct the third preset duration. Here, when the first correction time value is positive, the third preset duration can be positively compensated to increase it, thereby increasing the time the electronic expansion valve operates at its maximum opening during frost defrosting without reversing direction. When the first correction time value is negative, the third preset duration can be negatively compensated to decrease it, thereby decreasing the time the electronic expansion valve operates at its maximum opening during frost defrosting without reversing direction. When the first correction time value is zero, no compensation is needed for the third preset duration, keeping it at its original value, thus keeping the time the electronic expansion valve operates at its maximum opening during frost defrosting without reversing direction unchanged.

[0094] By setting S203~S204, the third preset duration can be matched and corrected in a timely manner according to the actual operating conditions 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 defrosting control method may include S205~S206.

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

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

[0098] For example, the frost-free heating time interval within which the first heating time falls can be determined first, and then a second correction time value can be determined based on the frost-free heating time interval and the first target frequency. Here, several continuously distributed frost-free heating time intervals and the aforementioned several outer ring temperature intervals can be pre-set in the control system of the air conditioner 1. Each outer ring temperature interval corresponds to a compressor frequency value, i.e., an optional value of the first target frequency, and a corresponding correction time value is set for each combination of frost-free heating time interval and each compressor frequency value. The number of frost-free heating time intervals and the length of each frost-free heating time interval can be determined according to actual needs, and this application embodiment does not limit this. Generally speaking, if there are many frost-free heating time intervals, there are many correction time values ​​set, the matching degree between each correction time value and the frost-free heating time interval is high, and the classification accuracy of the correction time value is high. Similarly, if the length of each frost-free heating time interval is short, the time range corresponding to each correction time value is small, the matching degree between each correction time value and the frost-free heating time interval is high, and the classification accuracy of the correction time value is high.

[0099] For example, at least four frost warming time intervals can be set. These intervals are: a first frost warming time interval greater than or equal to a first frost time threshold and less than a second frost time threshold; a second frost warming time interval greater than or equal to the second frost time threshold and less than a third frost time threshold; a third frost warming time interval greater than or equal to the third frost time threshold and less than a fourth frost time threshold; and a fourth frost warming time interval greater than or equal to the fourth frost time threshold and less than the first threshold time. The first, second, third, and fourth frost time thresholds, along with the first threshold time, increase sequentially. For example, for the same first target frequency, the correction time values ​​corresponding to the first, second, third, and fourth frost warming time intervals decrease sequentially, and each correction time value can be positive, negative, or zero, allowing the second correction time value to be positive, negative, or zero.

[0100] Thus, when it is determined that the first heating time is less than the first threshold time, the frost-free heating time interval within which the first heating time falls can be further determined. Then, based on this frost-free heating time interval and the first target frequency, a corresponding correction time value can be determined, which serves as the second correction time value to correct the first preset duration. Here, when the second correction time value is positive, the first preset duration can be positively compensated to increase it, thereby increasing the duration required to meet the first preset condition when determining the frost-free state and raising the threshold condition for the air conditioner 1 to enter the frost-free defrosting mode. When the second correction time value is negative, the first preset duration can be negatively compensated to decrease it, thereby reducing the duration required to meet the first preset condition when determining the frost-free state and lowering the threshold condition for the air conditioner 1 to enter the frost-free defrosting mode. When the second correction time value is zero, no compensation can be applied to the first preset duration, keeping it at its original value and ensuring that the duration required to meet the first preset condition when determining the frost-free state remains unchanged.

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

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

[0103] S31: Determine the second target frequency of the compressor, the second target speed of the outdoor fan, and the second opening reduction rate of the electronic expansion valve based on the outdoor ambient temperature. The second opening reduction rate is greater than zero.

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

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

[0106] Here, several continuously distributed outer ring temperature ranges can be pre-set in the control system of air conditioner 1, and corresponding compressor frequency values, outdoor fan speed values, and opening reduction rate values ​​can be set for each outer ring temperature range in the mid-frost non-reversing defrosting mode. The number of outer ring temperature ranges and the length of each outer ring temperature range can be determined according to actual needs, and this embodiment does not limit this. Generally speaking, if there are more outer ring temperature ranges, there will be more compressor frequency values, outdoor fan speed values, and opening reduction rate values ​​set, and the matching degree between each compressor frequency value, outdoor fan speed value, opening reduction rate value, and outer ring temperature range will be higher, and the classification accuracy of the compressor frequency value, outdoor fan speed value, and opening reduction rate value will be higher. Similarly, if the length of each outer ring temperature range is shorter, the temperature range corresponding to each compressor frequency value, outdoor fan speed value, and opening reduction rate value will be smaller, and the matching degree between each compressor frequency value, outdoor fan speed value, opening reduction rate value, and outer ring temperature range will be higher, and the classification accuracy of the compressor frequency value, outdoor fan speed value, and opening reduction rate value will be higher.

[0107] For example, at least four outer ring temperature ranges can be set. These at least four outer ring temperature ranges include: a sixth outer ring temperature range (less than the sixth outdoor threshold temperature and greater than or equal to the seventh outdoor threshold temperature); a seventh outer ring temperature range (less than the seventh outdoor threshold temperature and greater than or equal to the eighth outdoor threshold temperature); an eighth outer ring temperature range (less than the eighth outdoor threshold temperature and greater than or equal to the ninth outdoor threshold temperature); and a ninth outer ring temperature range (less than the ninth outdoor threshold temperature and greater than or equal to the tenth outdoor threshold temperature). The sixth, seventh, eighth, ninth, and tenth outdoor threshold temperatures decrease sequentially. For example, a first preset temperature can be used as the tenth outdoor threshold temperature; for example, the sixth outdoor threshold temperature is less than or equal to 0°C; for example, the sixth outdoor threshold temperature can be the same as the first outdoor threshold temperature, the seventh outdoor threshold temperature can be the same as the second outdoor threshold temperature, the eighth outdoor threshold temperature can be the same as the third outdoor threshold temperature, the ninth outdoor threshold temperature can be the same as the fourth outdoor threshold temperature, and the tenth outdoor threshold temperature can be the same as the fifth outdoor threshold temperature.

[0108] The compressor frequency values ​​corresponding to the sixth, seventh, eighth, and ninth outer ring temperature ranges decrease sequentially. For example, the compressor frequency value corresponding to the sixth outer ring temperature range is less than or equal to 1.5 times the second preset frequency, and the compressor frequency value corresponding to the ninth outer ring temperature range is greater than or equal to 0.3 times the second preset frequency. The second preset frequency is the default compressor frequency set for the non-reversing defrosting mode.

[0109] Among them, the outdoor fan speed values ​​corresponding to the sixth outer ring temperature range, the seventh outer ring temperature range, the eighth outer ring temperature range, and the ninth outer ring temperature range decrease sequentially. For example, the outdoor fan speed value corresponding to the sixth outer ring temperature range can be the initial speed of the outdoor fan, that is, the speed of the outdoor fan before entering the thin frost non-reversing defrosting mode; the outdoor fan speed value corresponding to the seventh outer ring temperature range 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 range is less than the initial speed of the outdoor fan; and the outdoor fan speed value corresponding to the ninth outer ring temperature range can be zero.

[0110] Specifically, the rate of decrease in opening for the sixth, seventh, eighth, and ninth outer ring temperature ranges increases sequentially. For example, the rate of decrease in opening for the sixth, seventh, eighth, and ninth outer ring temperature ranges is taken between 10 pps and 80 pps.

[0111] The specific values ​​of the sixth, seventh, eighth, ninth, and tenth outdoor threshold temperatures, as well as the compressor frequency, outdoor fan speed, and opening reduction rate corresponding to the non-reversing defrosting mode during frost, can be determined according to actual needs, and this application embodiment does not limit them.

[0112] S312: Determine the target frequency of the compressor, the target speed of the outdoor fan, and the rate of decrease in the opening of the electronic expansion valve based on the temperature range. After determining the temperature range in which the outdoor ambient temperature is located, the compressor frequency value, outdoor fan speed value, and rate of decrease in the opening of the electronic expansion valve corresponding to that temperature range can be determined, and these can be used as the target frequency of the compressor, the target speed of the outdoor fan, and the rate of decrease in the opening of the electronic expansion valve in the defrosting mode without reversing during frost.

[0113] S32: Controls the indoor fan to shut down, the compressor to operate at the second target frequency, the outdoor fan to operate at the second target speed, and controls the electronic expansion valve to operate at its maximum opening for a fourth preset time, then reduces its opening 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] For example, the second target frequency can be selected from the compressor frequency values ​​corresponding to the sixth, seventh, eighth, and ninth outer ring temperature ranges. Similarly, the second target rotational speed can be selected from the outdoor fan rotational speed values ​​corresponding to the sixth, seventh, eighth, and ninth outer ring temperature ranges. Similarly, the second opening reduction rate can be selected from the opening reduction rate values ​​corresponding to the sixth, seventh, eighth, and ninth outer ring temperature ranges.

[0115] like Figure 11 As shown, in some embodiments, after S30, the defrosting control method may include S301 to S302.

[0116] S301: Determine whether the time elapsed from entering the non-reversing defrosting mode until the outdoor coil temperature reaches 0℃ (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 heating time is less than the second threshold time, or determining that the first preset condition is met, control the air conditioner 1 to switch from the medium frost non-reversing defrosting mode to the thin frost non-reversing defrosting mode.

[0118] When the second heating time is less than the second threshold time, it can 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 thin frost state, and the air conditioner 1 can be controlled to switch from the medium frost non-reversing defrosting mode to the thin frost non-reversing defrosting mode.

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

[0120] like Figure 12 As shown, in some embodiments, after S30, the defrosting control method may include S303 to S304.

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

[0122] S304: In response to determining that the second heating time is greater than or equal to the third threshold time, or determining that the third preset condition is met, control the air conditioner 1 to switch from the mid-frost non-reversing defrost mode to the reverse-cycle defrost mode. Here, the third threshold time is greater than the second threshold time.

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

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

[0125] By setting S201~S202, the system can switch between the thin frost non-reversing defrosting mode, the medium frost non-reversing defrosting mode, and the reverse circulation defrosting mode in a timely manner, thereby improving the heating comfort of the air conditioner 1.

[0126] like Figure 13 As shown, in some examples, the defrosting control method may include S305~S306.

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

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

[0129] For example, several continuously distributed frost-heating time intervals and several outer ring temperature intervals can be pre-set in the control system of air conditioner 1. Each outer ring temperature interval corresponds to a compressor frequency value, i.e., an optional value of the second target frequency, and a corresponding correction time value is set for each combination of frost-heating time interval and each compressor frequency value. The number of frost-heating time intervals and the length of each frost-heating time interval can be determined according to actual needs, and this application embodiment does not limit this. Generally speaking, if there are more frost-heating time intervals, there are more correction time values ​​set, the matching degree between each correction time value and the frost-heating time interval is higher, and the classification accuracy of the correction time values ​​is higher. Similarly, if the length of each frost-heating time interval is shorter, the time range corresponding to each correction time value is smaller, the matching degree between each correction time value and the frost-heating time interval is higher, and the classification accuracy of the correction time values ​​is higher.

[0130] For example, at least four frost warming time intervals can be set. These at least four frost warming time intervals are: a first frost warming time interval greater than or equal to a second threshold time and less than a second frost time threshold; a second frost warming time interval greater than or equal to a second frost time threshold and less than a third frost time threshold; a third frost warming time interval greater than or equal to a third frost time threshold and less than a fourth frost time threshold; and a fourth frost warming time interval greater than or equal to a fourth frost time threshold and less than a third threshold time. The second threshold time, second frost time threshold, third frost time threshold, fourth frost time threshold, and third threshold time increase sequentially. For example, for the same second target frequency, the correction time values ​​corresponding to the first frost warming time interval, the second frost warming time interval, the third frost warming time interval, and the fourth frost warming time interval increase sequentially, and each correction time value can be positive, negative, or zero, so that the first correction time value can be positive, negative, or zero.

[0131] Thus, when the second heating time is determined to be greater than or equal to the second threshold time and less than the third threshold time, the frost heating time interval within which the second heating time falls can be further determined. Then, based on this frost heating time interval and the second target frequency, a corresponding correction time value can be determined, which serves as the third correction time value to correct the fourth preset duration. Here, when the third correction time value is positive, the fourth preset duration can be positively compensated to increase it, thereby increasing the time the electronic expansion valve operates at its maximum opening during frost defrosting without reversing direction. When the third correction time value is negative, the fourth preset duration can be negatively compensated to decrease it, thereby decreasing the time the electronic expansion valve operates at its maximum opening during frost defrosting without reversing direction. When the third correction time value is zero, no compensation is needed for the fourth preset duration, keeping it at its original value, thus maintaining the same time the electronic expansion valve operates at its maximum opening during frost defrosting without reversing direction.

[0132] By setting S305~S306, the fourth preset duration can be matched and corrected in a timely manner according to the actual operating conditions of the air conditioner 1, thereby improving the defrosting effect of the mid-frost non-reversing defrosting mode.

[0133] like Figure 14 As shown, in some examples, the defrosting control method may include S307~S308.

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

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

[0136] For example, several continuously distributed frost-heating time intervals and several outer ring temperature intervals can be pre-set in the control system of air conditioner 1. Each outer ring temperature interval corresponds to a compressor frequency value, i.e., an optional value of the second target frequency, and a corresponding correction time value is set for each combination of frost-heating time interval and each compressor frequency value. The number of frost-heating time intervals and the length of each frost-heating time interval can be determined according to actual needs, and this application embodiment does not limit this. Generally speaking, if there are more frost-heating time intervals, there are more correction time values ​​set, the matching degree between each correction time value and the frost-heating time interval is higher, and the classification accuracy of the correction time values ​​is higher. Similarly, if the length of each frost-heating time interval is shorter, the time range corresponding to each correction time value is smaller, the matching degree between each correction time value and the frost-heating time interval is higher, and the classification accuracy of the correction time values ​​is higher.

[0137] For example, at least four frost warming time intervals can be set. These at least four frost warming time intervals are: a first frost warming time interval greater than or equal to a second threshold time and less than a second frost time threshold; a second frost warming time interval greater than or equal to a second frost time threshold and less than a third frost time threshold; a third frost warming time interval greater than or equal to a third frost time threshold and less than a fourth frost time threshold; and a fourth frost warming time interval greater than or equal to a fourth frost time threshold and less than a third threshold time. The second threshold time, second frost time threshold, third frost time threshold, fourth frost time threshold, and third threshold time increase sequentially. For example, for the same second target frequency, the correction time values ​​corresponding to the first frost warming time interval, the second frost warming time interval, the third frost warming time interval, and the fourth frost warming time interval increase sequentially, and each correction time value can be positive, negative, or zero, so that the first correction time value can be positive, negative, or zero.

[0138] Thus, when the second heating time is determined to be greater than or equal to the second threshold time and less than the third threshold time, the frost heating time interval within which the second heating time falls can be further determined. Then, based on this frost heating time interval and the second target frequency, a corresponding correction time value can be determined, which serves as the fourth correction time value to correct the second preset duration. Here, when the fourth correction time value is positive, the second preset duration can be positively compensated to increase it, thereby increasing the duration required to meet the second preset condition when determining the frost state and raising the threshold condition for the air conditioner 1 to enter the frost-free defrosting mode. When the fourth correction time value is negative, the second preset duration can be negatively compensated to decrease it, thereby reducing the duration required to meet the second preset condition when determining the frost state and lowering the threshold condition for the air conditioner 1 to enter the frost-free defrosting mode. When the fourth correction time value is zero, no compensation can be applied to the second preset duration to maintain its original value, ensuring that the duration required to meet the second preset condition when determining the frost state remains unchanged.

[0139] By setting S307~S308, the second preset duration can be matched and corrected in a timely manner according to the actual operating conditions of the air conditioner 1, thereby improving the defrosting effect of the mid-frost non-reversing defrosting mode.

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

[0141] S41: Determine the third target frequency of the compressor and the target operating status of the outdoor fan based on the outdoor ambient temperature.

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

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

[0144] Here, several continuously distributed outer ring temperature ranges can be pre-set in the control system of air conditioner 1, and corresponding compressor frequency values ​​and target operating states of outdoor fans in the mid-frost non-reversing defrosting mode can be set for each outer ring temperature range. The number of outer ring temperature ranges and the length of each outer ring temperature range can be determined according to actual needs, and this embodiment does not limit this. Generally speaking, if there are more outer ring temperature ranges, there will be more compressor frequency values ​​and target operating states of outdoor fans set, the matching degree between each compressor frequency value, target operating state of outdoor fans and outer ring temperature range will be higher, and the classification accuracy of compressor frequency values ​​and target operating states of outdoor fans will be higher. Similarly, if the length of each outer ring temperature range is shorter, the temperature range corresponding to each target operating state of outdoor fans will be smaller, the matching degree between each compressor frequency value, target operating state of outdoor fans and outer ring temperature range will be higher, and the classification accuracy of compressor frequency values, outdoor fan speed values ​​and opening reduction rate values ​​will be higher.

[0145] For example, at least three outer ring temperature ranges can be set. These at least three outer ring temperature ranges include an eleventh outer ring temperature range (temperature lower than the eleventh outdoor threshold temperature), a twelfth outer ring temperature range (temperature lower than the twelfth outdoor threshold temperature but greater than or equal to the eleventh outdoor threshold temperature), and a thirteenth outer ring temperature range (temperature lower than the thirteenth outdoor threshold temperature but greater than or equal to the twelfth outdoor threshold temperature). The eleventh, twelfth, and thirteenth outdoor threshold temperatures increase sequentially. For example, a first preset temperature can be used as the thirteenth outdoor threshold temperature.

[0146] The compressor frequency values ​​corresponding to the eleventh outer ring temperature range, the twelfth outer ring temperature range, and the thirteenth outer ring temperature range decrease sequentially. For example, the compressor frequency value corresponding to the eleventh outer ring temperature range is less than or equal to 1.5 times the third preset frequency, and the compressor frequency value corresponding to the thirteenth outer ring temperature range is greater than or equal to 0.3 times the third preset frequency. The third preset frequency is the default compressor frequency set for the reverse cycle defrosting mode.

[0147] Among them, the target operating state of the outdoor fans corresponding to the eleventh outer ring temperature range and the twelfth outer ring temperature range is that the outdoor fans are kept stopped, while the target operating state of the outdoor fans corresponding to the thirteenth outer ring temperature range is that the outdoor fans maintain the initial speed, that is, the speed of the outdoor fans before entering the reverse circulation defrosting mode.

[0148] Furthermore, outdoor ambient humidity can be considered in at least a portion of the outer ring temperature range to determine the third target frequency of the compressor and the target operating state of the outdoor fan. For example, outdoor ambient humidity can be considered in the twelfth outer ring temperature range; when the outdoor ambient temperature is in the twelfth outer ring temperature range and the outdoor ambient humidity is greater than or equal to the aforementioned preset humidity, the corresponding compressor frequency value can be set to the same as the compressor frequency value corresponding to the eleventh outer ring temperature range, and the outdoor fan can be kept off; when the outdoor ambient temperature is in the twelfth outer ring temperature range and the outdoor ambient humidity is less than the aforementioned preset humidity, the corresponding compressor frequency value can be set to less than the compressor frequency value corresponding to the eleventh outer ring temperature range, and the outdoor fan can be kept off.

[0149] S42: Controls the compressor to stop, the reversing valve to switch, the indoor fan to gradually shut down, and after the reversing valve switches, controls the compressor to run at the third target frequency and the outdoor fan to run at the target operating state.

[0150] Secondly, embodiments of this application provide a defrosting control device, which includes: a frost determination circuit configured to determine the degree of frost on an outdoor heat exchanger; a first defrosting circuit 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; and a third defrosting circuit configured to control the air conditioner to enter a reverse circulation defrosting mode in response to determining that the outdoor heat exchanger is in a heavy frost state.

[0151] like Figure 15 As shown, in a third aspect, this application provides an air conditioner 1, including a processor 10 and a memory 20. The memory 20 stores a computer program, which, when executed by the processor 10, implements the defrosting control method provided in any of the above embodiments.

[0152] Processor 10 is connected to memory 20 and can perform various actions and processes according to the program stored in memory 20. Specifically, processor 10 can be an integrated circuit chip with signal processing capabilities. The processor 10 can be a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), off-the-shelf programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, and can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor, and can be based on x86 architecture or ARM architecture.

[0153] Memory 20 may be volatile or non-volatile, or may include both. Non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory may be random access memory (RAM) 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), synchronous linked dynamic random access memory (SLDRAM), and direct memory bus random access memory (DRRAM). It should be noted that memory 20 of the methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0154] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor 10 to execute the steps in the control method of any of the above embodiments.

[0155] For example, the aforementioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical discs (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 this 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 defrosting control method, apparatus, air conditioner, and computer-readable storage medium provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A defrosting control method, characterized in that, include: Determine the degree of frosting on the outdoor heat exchanger; In response to determining that the outdoor heat exchanger is in a thin frost state, the air conditioner is controlled to enter the thin frost non-reversing defrost mode. In response to determining that the outdoor heat exchanger is in a mid-frost state, the air conditioner is controlled to enter the mid-frost non-reversing defrost mode. In response to the determination that the outdoor heat exchanger is in a heavy defrost state, the air conditioner is controlled to enter the reverse circulation defrost mode. Controlling the air conditioner to enter the defrost mode without reversing includes: The rate of change of indoor fan speed is determined based on the indoor coil temperature, wherein the absolute value of the rate of change of speed is greater than or equal to zero. 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 are determined based on the outdoor ambient temperature, wherein the first opening reduction rate is greater than zero. The indoor fan is controlled to gradually change or remain constant from its initial speed at the speed change rate, the compressor is controlled to operate at the first target frequency, the outdoor fan is controlled to operate at the first target speed, and the electronic expansion valve is controlled to operate at its maximum opening for a third preset time and then decrease to its initial opening at the first opening decrease rate. The initial rotational speed is the rotational speed of the indoor fan before entering the thin frost non-reversing defrosting mode, and the initial opening is the opening of the electronic expansion valve before entering the thin frost non-reversing defrosting mode.

2. The defrosting control method according to claim 1, characterized in that, Determine the degree of frost buildup on the outdoor heat exchanger, including: In response to the determination that the duration of satisfying the first preset condition is greater than the first preset duration, it is determined that the outdoor heat exchanger is in a thin frost state. In response to the determination that the duration of satisfying the second preset condition is greater than the second preset duration, it is determined that the outdoor heat exchanger is in a mid-frost state; In response to the determination that the third preset condition is met, the outdoor heat exchanger is determined to be in a heavy frost state; The first preset conditions are: 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 duration is less than the second preset duration, and the first preset temperature difference is less than the second preset temperature difference.

3. The defrosting control method according to claim 1 or 2, characterized in that, After the air conditioner enters the thin frost non-reversing defrost mode, the defrost control method includes: Determine whether the time elapsed from entering the thin frost non-reversing defrost mode until the outdoor coil temperature reaches 0℃ is greater than or equal to the first threshold time, or determine whether the second preset condition is met. In response to determining that the time elapsed from entering the thin frost non-reversing defrosting 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 thin frost non-reversing defrosting mode to the medium frost non-reversing defrosting mode.

4. The defrosting control method according to claim 3, characterized in that, The defrosting control method includes: In response to determining that the time elapsed from entering the thin frost non-reversing defrost mode until the outdoor coil temperature reaches 0°C is less than a first threshold time, a first correction time value is determined based on the time elapsed from entering the thin frost non-reversing defrost mode until the outdoor coil temperature reaches 0°C and the first target frequency. The third preset duration is corrected based on the first corrected time value.

5. The defrosting control method according to claim 3, 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 defrosting control method includes: In response to determining that the time elapsed from entering the thin frost non-reversing defrost mode until the outdoor coil temperature reaches 0°C is less than a first threshold time, a second correction time value is determined based on the time elapsed from entering the thin frost non-reversing defrost mode until 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.

6. The defrosting control method according to claim 1, characterized in that, Controlling the air conditioner to enter the mid-frost defrost mode without reversing includes: The second target frequency of the compressor, the second target speed of the outdoor fan, and the second opening reduction rate of the electronic expansion valve are determined based on the outdoor ambient temperature, wherein the second opening reduction rate is greater than zero. The system controls the indoor fan to shut down, the compressor to operate at the second target frequency, the outdoor fan to operate at the second target speed, and the electronic expansion valve to operate at its maximum opening for a fourth preset time before decreasing to its initial opening at the second opening reduction rate. The initial opening is the opening of the electronic expansion valve before entering the defrosting mode without reversing.

7. The defrosting control method according to claim 6, characterized in that, After the air conditioner is controlled to enter the mid-frost non-reversing defrost mode, the defrost control method includes: Determine whether the time elapsed from entering the non-reversing defrosting mode to when the outdoor coil temperature reaches 0℃ is less than the second threshold time, or determine whether the first preset condition is met. In response to determining that the time elapsed from entering the mid-frost non-reversing defrosting mode until the outdoor coil temperature reaches 0°C is less than the second threshold time, or determining that the first preset condition is met, the air conditioner is controlled to switch from the mid-frost non-reversing defrosting mode to the thin-frost non-reversing defrosting mode. and / or; Determine whether the time elapsed from entering the non-reversing defrosting mode to when the outdoor coil temperature reaches 0℃ is greater than or equal to the third threshold time, or determine whether the third preset condition is met. In response to determining that the time elapsed from entering the non-reversing defrost mode to 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, the air conditioner is controlled to switch from the non-reversing defrost mode to the reverse circulation defrost mode. The third threshold time is greater than the second threshold time.

8. The defrosting control method according to claim 7, characterized in that, Controlling the air conditioner to enter the non-reversing defrosting mode includes: determining the second target frequency of the compressor, the second target speed of the outdoor fan, and the second opening reduction rate of the electronic expansion valve based on the outdoor ambient temperature, wherein the second opening reduction rate is greater than zero; controlling the indoor fan to shut down, 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 its maximum opening for a fourth preset time before reducing it to its initial opening at the second opening reduction rate; The defrosting control method includes: In response to determining that the time elapsed from entering the mid-frost non-reversing defrosting mode until the outdoor coil temperature reaches 0°C is greater than or equal to the second threshold time and less than the third threshold time, a third correction time value is determined based on the time elapsed from entering the mid-frost non-reversing defrosting mode until the outdoor coil temperature reaches 0°C and the second target frequency. The fourth preset duration is corrected based on the third corrected time value.

9. The defrosting control method according to claim 7, 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 state of moderate frost. The defrosting control method includes: In response to determining that the time elapsed from entering the mid-frost non-reversing defrosting mode until the outdoor coil temperature reaches 0°C is greater than or equal to the second threshold time and less than the third threshold time, a fourth correction time value is determined based on the time elapsed from entering the mid-frost non-reversing defrosting mode until 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.

10. A defrosting control device, characterized in that, include: The frosting detection circuit is configured to determine the degree of frosting on the outdoor heat exchanger. The first defrosting circuit is configured to control the air conditioner to enter the defrosting mode without reversing in response to determining that the outdoor heat exchanger is in a thin frost state. The second defrosting circuit is configured to control the air conditioner to enter the defrosting mode without reversing in response to determining that the outdoor heat exchanger is in a frost state. The third defrosting circuit is configured to control the air conditioner to enter the reverse cycle defrosting mode in response to determining that the outdoor heat exchanger is in a heavy frost state. Controlling the air conditioner to enter the defrost mode without reversing includes: The rate of change of indoor fan speed is determined based on the indoor coil temperature, wherein the absolute value of the rate of change of speed is greater than or equal to zero. 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 are determined based on the outdoor ambient temperature, wherein the first opening reduction rate is greater than zero. The indoor fan is controlled to gradually change or remain constant from its initial speed at the speed change rate, the compressor is controlled to operate at the first target frequency, the outdoor fan is controlled to operate at the first target speed, and the electronic expansion valve is controlled to operate at its maximum opening for a third preset time and then decrease to its initial opening at the first opening decrease rate. The initial rotational speed is the rotational speed of the indoor fan before entering the thin frost non-reversing defrosting mode, and the initial opening is the opening of the electronic expansion valve before entering the thin frost non-reversing defrosting mode.

11. An air conditioner, characterized in that, include: Memory, which stores computer programs; A processor, wherein the computer program, when executed by the processor, implements the defrosting control method as described in any one of claims 1 to 9.

12. A computer-readable storage medium, characterized in that, It stores a computer program, which is loaded by a processor to execute the steps of the defrosting control method according to any one of claims 1 to 9.

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