Defrosting control method, defrosting control device and air conditioner

Abstract

The invention provides a defrosting control method, a defrosting control device and an air conditioner. When the air conditioner operates in a heating mode, the outdoor environment relative humidity and the outdoor environment temperature are different, the frosting degrees of an outdoor unit of the air conditioner are different, and the optimal defrosting time is also different. And the rotating speed control voltage of the outdoor fan at the optimal defrosting moment under different outdoor environment relative humidity and outdoor environment temperature conditions is recorded. And under the condition of different outdoor environment relative humidity and outdoor environment temperature preset interval combinations, when the outdoor fan rotating speed control voltage reaches the corresponding preset value, the air conditioner is controlled to enter the defrosting mode, and the problem that the heating capacity of the air conditioner is attenuated due to the fact that the air conditioner starts defrosting too early or too late is solved.

Description

Technical Field

[0001] This application relates to the field of air conditioning, specifically to a defrosting control method and a defrosting control device for executing the control method, as well as an air conditioner using the defrosting control method or having the defrosting control device. Background Technology

[0002] Frosting on air-cooled heat exchangers is a key challenge hindering the widespread application of air conditioners in areas with low temperatures and high humidity during winter. When air conditioners are in heating mode during winter, the outdoor heat exchanger absorbs heat from the outside air and supplies it to the indoor unit. When the outdoor temperature is low and the relative humidity is high, frost will form on the outdoor heat exchanger. As the frost layer on the outdoor heat exchanger thickens, its thermal resistance increases, heat exchange efficiency decreases, and the air conditioner's heating capacity significantly reduces, resulting in lower energy efficiency. Therefore, regular defrosting is necessary to improve the air conditioner's energy efficiency. However, during defrosting, the indoor heating may stop or become insufficient, potentially affecting the user's thermal comfort.

[0003] If the defrosting process of the outdoor unit is not precise, starting defrosting too early or too late will cause a significant reduction in the air conditioner's heating capacity. If the defrosting process is not precise, ending defrosting too early may result in incomplete defrosting, affecting the air conditioner's heating capacity; ending defrosting too late will cause the air conditioner to absorb more heat from the indoor unit, reducing energy efficiency and affecting indoor thermal comfort. Summary of the Invention

[0004] This application aims to provide a defrosting control method to at least solve or alleviate some of the problems existing in the prior art.

[0005] This application provides a defrosting control method for defrosting the outdoor unit of an air conditioner, comprising: an outdoor relative humidity detection step, detecting the outdoor relative humidity Rh of the outdoor environment where the outdoor unit is located; an outdoor ambient temperature detection step, detecting the outdoor ambient temperature t of the outdoor unit; an outdoor fan speed control voltage detection step, detecting the outdoor fan speed control voltage Vsp of the outdoor unit; a defrosting condition judgment step, judging whether there is a possibility of defrosting based on the comparison results of the outdoor relative humidity Rh and outdoor ambient temperature t with the preset relative humidity range Rh-range and the preset outdoor temperature range t-range; and a defrosting timing judgment step, judging the timing of starting defrosting based on the judgment result of the defrosting condition judgment step and the comparison result of the detected outdoor fan speed control voltage Vsp with the preset fan speed control voltage Vspn.

[0006] In the optional technical solution, the preset fan speed control voltage Vspn is matched and set in relation to the preset relative humidity range Rh-range and the preset outdoor temperature range t-range.

[0007] In the optional technical solution, the preset fan speed control voltage Vspn is set in accordance with the preset relative humidity range and preset outdoor temperature range, corresponding to the preset frost thickness of the outdoor unit.

[0008] In the optional technical solution, the preset fan speed control voltage Vspn is the theoretical maximum speed control voltage Vspmax of the outdoor fan within the corresponding preset relative humidity range and preset outdoor temperature range.

[0009] In the optional technical solution, in the defrosting condition judgment step, if the outdoor relative humidity and outdoor temperature do not fall within the preset relative humidity range and preset outdoor temperature range, it is determined that defrosting is not required, and the defrosting timing judgment step is not executed.

[0010] In the optional technical solution, during the defrosting timing determination step, when the detected outdoor fan speed control voltage Vsp reaches the preset fan speed control voltage Vspn, the air conditioner executes the preset defrosting operation mode.

[0011] In the optional technical solution, when the outdoor fan speed control voltage Vsp exceeds the theoretical maximum speed control voltage Vspmax, and the difference between the target set speed Vt and the actual speed V of the outdoor fan reaches the preset speed difference △V, the air conditioner executes the preset defrosting operation mode.

[0012] In the optional technical solution, when the outdoor fan speed control voltage Vsp is less than the specified minimum speed control voltage Vsp0 in the defrosting operation mode, the defrosting operation mode is exited.

[0013] In the optional technical solution, the minimum speed control voltage Vsp0 is specified as the minimum speed control voltage of the outdoor fan that is detected and recorded under the condition of no frost.

[0014] Another aspect of this application provides a defrosting control device for defrosting control of an outdoor unit of an air conditioner, comprising: an outdoor relative humidity detection module for detecting the outdoor relative humidity Rh of the outdoor environment where the outdoor unit is located; an outdoor ambient temperature detection module for detecting the outdoor ambient temperature t of the outdoor unit; an outdoor fan speed control voltage detection module for detecting the outdoor fan speed control voltage Vsp of the outdoor unit; a defrosting condition judgment module for judging whether defrosting is necessary based on the comparison results between the outdoor relative humidity Rh and the outdoor ambient temperature t and the preset relative humidity range Rh-range and the preset outdoor temperature range t-range; and a defrosting timing judgment module for judging the timing of starting defrosting based on the judgment result of the defrosting condition judgment module and the comparison result between the detected outdoor fan speed control voltage Vsp and the preset fan speed control voltage Vspn.

[0015] In another aspect of this application, an air conditioner is provided, which includes the aforementioned defrosting control device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the execution steps of the defrosting control method in the embodiments of this application.

[0017] Figure 2 This is a schematic diagram illustrating the execution steps of the defrosting control method in the embodiments of this application.

[0018] Figure 3 This is a schematic diagram of the defrosting control device module in the embodiments of this application.

[0019] Figure label:

[0020] Outdoor ambient relative humidity detection module 1, outdoor ambient temperature detection module 2, outdoor fan speed control voltage detection module 3, defrosting condition judgment module 4, defrosting timing judgment module 5. Detailed Implementation

[0021] It should be noted that the following will use examples to illustrate the working principle, features and advantages of the air conditioner according to this application. However, it should be understood that all descriptions are given for illustrative purposes only and should not be construed as limiting this application in any way.

[0022] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various figures, this application still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle, thereby obtaining more other embodiments of this application that may not be directly mentioned herein.

[0023] <First Implementation Method>

[0024] Figure 1 This is a schematic diagram illustrating the execution steps of the defrosting control method in one embodiment of this application. (See attached diagram) Figure 1 As shown, the defrosting control method involved in this embodiment includes: outdoor ambient relative humidity detection step S1; outdoor ambient temperature detection step S2; outdoor fan speed control voltage detection step S3; defrosting condition judgment step S4; and defrosting timing judgment step S5.

[0025] In this embodiment of the application, when the air conditioner is turned on and running in heating mode, the outdoor relative humidity detection step S1 is executed to detect the outdoor relative humidity Rh of the outdoor unit, the outdoor temperature detection step S2 is executed to detect the outdoor temperature t of the outdoor unit, and after obtaining the outdoor relative humidity Rh and the outdoor temperature t, the defrosting condition judgment step S4 is executed.

[0026] In the defrosting condition judgment step S4, the real-time detected outdoor relative humidity Rh and outdoor temperature t are compared with the preset relative humidity range Rh-range and the preset outdoor temperature range t-range, respectively. The preset relative humidity range Rh-range is a relative humidity range that is obtained based on measured data or theoretical derivation and is preset and stored in the storage device, indicating that the outdoor unit may or is prone to frost. Similarly, the preset outdoor temperature range t-range is an outdoor temperature range that is obtained based on measured data or theoretical derivation and is preset and stored in the storage device, indicating that the outdoor unit may or is prone to frost.

[0027] For example, if the actual measured outdoor ambient temperature t is less than the maximum value of the preset outdoor temperature range t-range, which is the maximum temperature at which the outdoor unit may start to frost, such as 7℃, and at the same time the outdoor ambient relative humidity Rh is greater than the minimum value of the preset relative humidity range Rh-range Rh-min, such as 50%, then it is determined that the outdoor unit may need to be defrosted.

[0028] When the defrosting condition judgment step S4 determines that the outdoor unit may require defrosting, the outdoor fan speed control voltage detection step S3 is executed. In the outdoor fan speed control voltage detection step S3, the outdoor fan speed control voltage Vsp of the outdoor unit is detected in real time, and after obtaining the outdoor fan speed control voltage Vsp, the defrosting timing judgment step S5 is executed. In the defrosting timing judgment step S5, based on the judgment result of the defrosting condition judgment step S4, and the comparison result between the detected outdoor fan speed control voltage Vsp and the preset fan speed control voltage Vspn, the timing for starting defrosting is determined.

[0029] Specifically, based on experimental data or theoretical derivation, we can determine the outdoor unit's potential for frost formation under the given outdoor relative humidity Rh and outdoor temperature t. This means we can obtain a preset relative humidity range Rh-range and a preset outdoor temperature range t-range under which frost formation might begin. When the current outdoor relative humidity Rh and current outdoor temperature t detected in outdoor relative humidity detection step S1 and outdoor temperature detection step S2 fall within the preset relative humidity range Rh-range and preset outdoor temperature range t-range, it is determined that the outdoor unit may require defrosting.

[0030] Once it is determined that the outdoor unit may require defrosting, the system further compares the current outdoor fan speed control voltage Vsp with the preset fan speed control voltage Vspn. Specifically, when the current outdoor fan speed control voltage Vsp reaches the preset fan speed control voltage Vspn, it is determined that this is the optimal time to begin defrosting. Based on this determination, the air conditioner then commands the unit to enter defrosting mode.

[0031] The preset fan speed control voltage Vspn can be the fan speed control voltage when the outdoor unit frost thickness reaches the required defrosting thickness (i.e., the optimal time to start defrosting when the outdoor unit frost thickness reaches the required defrosting thickness), or it can be the deviation threshold between the fan speed control voltage and the normal fan speed control voltage (i.e., the fan speed control voltage value under non-frost conditions), and there are no special restrictions.

[0032] The preset fan speed control voltage Vspn can be obtained from experimental results or theoretical calculations and stored in a storage device for comparison with the current outdoor fan speed control voltage Vsp.

[0033] When the frost thickness on the outdoor unit changes, the measured real-time outdoor fan speed control voltage Vsp also changes due to the altered air resistance. By comparing the current outdoor fan speed control voltage Vsp with the preset fan speed control voltage Vspn, the optimal time to begin defrosting can be determined. This precise voltage data allows for accurate judgment of when the outdoor unit needs to begin defrosting. Therefore, the timing of defrosting initiation can be precisely controlled, improving the air conditioner's energy efficiency and preventing the impact on user thermal comfort caused by starting defrosting too early or too late.

[0034] As a preferred embodiment of this application, the preset fan speed control voltage Vspn is matched and set in relation to the preset relative humidity range Rh-range and the preset outdoor temperature range t-range.

[0035] Generally, the degree of frost formation on the outdoor unit varies under different outdoor relative humidity (Rh) and outdoor temperature (t). Typically, the lower the outdoor relative humidity (Rh) and the higher the outdoor temperature (t), the slower the frost formation on the outdoor unit, and the longer it takes to reach the optimal defrosting time. Conversely, the higher the outdoor relative humidity (Rh) and the lower the outdoor temperature (t), the faster the frost formation on the outdoor unit, and the shorter the time required to reach the optimal defrosting time. If defrosting is not completed in time, it will lead to an increase in the thermal resistance of the outdoor unit's heat exchanger, a decrease in the heat exchange efficiency of the heat exchanger, and a reduction in the heating capacity of the air conditioner.

[0036] Because the preset fan speed control voltage Vspn is set in conjunction with the preset relative humidity range Rh-range and the preset outdoor temperature range t-range, comparing the real-time detected outdoor fan speed control voltage Vsp with the preset fan speed control voltage Vspn establishes a correlation between the real-time detected outdoor fan speed control voltage Vsp and the preset relative humidity range Rh-range and the preset outdoor temperature range t-range. This allows for determining whether to enter defrosting mode based on the real-time detected outdoor fan speed control voltage Vsp.

[0037] As a preferred embodiment of this application, the preset fan speed control voltage Vspn is set in accordance with the preset relative humidity range Rh-range and the preset outdoor temperature range t-range, corresponding to the preset frost thickness of the outdoor unit.

[0038] In addition to establishing a correlation with the preset relative humidity range Rh-range and the preset outdoor temperature range t-range, the preset fan speed control voltage Vspn also establishes a matching correlation with the preset frost thickness of the outdoor unit. This allows for a more accurate determination of whether to enter defrosting mode by using the comparison results between the real-time detected outdoor fan speed control voltage Vsp and the preset fan speed control voltage Vspn.

[0039] Preferably, the preset fan speed control voltage Vspn is the theoretical maximum speed control voltage Vspmax of the outdoor fan within the corresponding preset relative humidity range and preset outdoor temperature range.

[0040] Preferably, in the defrosting timing determination step S4, when the detected outdoor fan speed control voltage Vsp reaches the preset fan speed control voltage Vspn, the air conditioner executes the preset defrosting operation mode and controls the outdoor fan to run at the minimum speed.

[0041] According to experimental data or theoretical derivation, the frosting thickness at the optimal defrosting moment of the outdoor unit can be obtained under different conditions of outdoor ambient relative humidity Rh and outdoor ambient temperature t. And record the control voltage Vsp of the outdoor fan speed when the outdoor unit reaches the frosting thickness at the optimal defrosting moment under different conditions of outdoor ambient relative humidity Rh and outdoor ambient temperature t, as the preset fan speed control voltage Vspn. When the outdoor ambient relative humidity Rh and outdoor ambient temperature t detected in the outdoor ambient relative humidity detection step S1 and the outdoor ambient temperature detection step S2 satisfy the preset relative humidity range Rh-range and the preset outdoor temperature range t-range, compare the currently real-time outdoor fan speed control voltage Vsp detected in the outdoor fan speed control voltage detection step S3 with the preset fan speed control voltage Vspn corresponding to the preset relative humidity range Rh-range and the preset outdoor temperature range t-range. If the currently real-time outdoor fan speed control voltage Vsp detected is equal to or greater than the preset fan speed control voltage Vspn, it is determined that the frosting degree of the outdoor unit reaches the frosting thickness at the optimal defrosting moment, and control the outdoor unit to start defrosting in the preset defrosting mode.

[0042] Specifically, the preset relative humidity range Rh-range can be divided into multiple relative humidity intervals in advance, the preset outdoor temperature range t-range can be divided into multiple temperature intervals, and different humidity intervals are combined with different temperature intervals. For example, the preset relative humidity range Rh-range is divided into the preset relative humidity range Rh-range1 (Rh-min < Rh ≤ 60%), the preset relative humidity range Rh-range2 (60% < Rh ≤ 70%), the preset relative humidity range Rh-range3 (70% < Rh ≤ 80%), and the preset relative humidity range Rh-range4 (80% < Rh ≤ Rh-max). The preset outdoor temperature range t-range is divided into the preset outdoor temperature range t-range1 (-25°C < t ≤ -20°C), the preset outdoor temperature range t-range2 (-20°C < t ≤ -15°C), the preset outdoor temperature range t-range3 (-15°C < t ≤ -10°C), the preset outdoor temperature range t-range4 (-10°C < t ≤ -5°C), the preset outdoor temperature range t-range5 (-5°C < t ≤ 0°C), and the preset outdoor temperature range t-range6 (0°C < t ≤ 7°C).

[0043] Among them, -25°C in the preset outdoor temperature range t-range1 (-25°C < t ≤ -20°C) is the assumed lowest outdoor temperature at which the air conditioner is allowed to operate.

[0044] Different outdoor relative humidity ranges Rh and different outdoor temperature ranges t were combined, and based on experimental data or theoretical derivation, the frost thickness at the optimal defrosting time of the outdoor unit under different outdoor relative humidity Rh and outdoor temperature t conditions was set as H1, H2, H3, ..., H24, as shown in Table 1:

[0045] Table 1

[0046]

[0047] As the degree of outdoor frost increases, the load on the outdoor fan will also increase. In order to achieve the target speed of the outdoor fan, the outdoor fan speed control voltage Vspn will also be adjusted and increased. Through experiments, the fan speed control voltages Vsp1, Vsp2, Vsp3, ..., Vsp24 corresponding to the frost thickness H1, H2, H3, ..., H24 at the optimal defrosting time of the outdoor unit under different outdoor environmental conditions (relative humidity and outdoor temperature) when the outdoor fan reaches its maximum speed are obtained and stored as the preset fan speed control voltage Vspn of the outdoor unit.

[0048] Using the above method, when the air conditioner is running in heating mode, the outdoor relative humidity Rh and outdoor temperature t are detected and compared with the preset relative humidity range Rh-range and the preset outdoor temperature range t-range. Taking a current outdoor relative humidity Rh of 65% and an outdoor temperature t of -18℃ as an example, according to Table 1, under the current outdoor environmental conditions, the preset optimal defrosting time frost thickness for the outdoor unit is H6, and the corresponding preset fan speed control voltage Vspn for the outdoor unit is Vsp6. By executing the outdoor fan speed control voltage detection step S3, the outdoor fan speed control voltage Vsp is detected in real time. When the outdoor fan speed control voltage Vsp reaches Vsp6, it is determined that the frost level of the outdoor unit has reached H6, and the outdoor unit is controlled to start defrosting mode. In defrosting mode, the outdoor fan is adjusted to run at the lowest speed. This avoids the problem of reduced heating capacity of the air conditioner due to starting defrosting too early or too late, which affects indoor comfort.

[0049] Preferably, in the defrosting condition judgment step S4, if the outdoor relative humidity Rh and the outdoor temperature t do not fall within the preset relative humidity range Rh-range and the preset outdoor temperature range t-range, it is determined that defrosting is not required, and the defrosting timing judgment step S5 is not executed.

[0050] Through the above implementation method, when the outdoor relative humidity Rh and outdoor ambient temperature t do not fall within the preset relative humidity range Rh-range and the preset outdoor temperature range t-range, that is, when the outdoor relative humidity Rh is lower than Rh-min or the outdoor ambient temperature t is lower than the minimum allowable operating temperature of the air conditioner or the outdoor ambient temperature t is higher than the maximum temperature at which the outdoor unit may begin to frost, it is determined that defrosting is not required, and the defrosting timing determination step S5 is not executed. Therefore, when the outdoor relative humidity Rh and outdoor ambient temperature t do not fall within the preset relative humidity range Rh-range and the preset outdoor temperature range t-range, even if there is a slight degree of frost, the outdoor unit will not enter the defrosting mode. This utilizes the data information of the outdoor relative humidity Rh and outdoor ambient temperature t to avoid prematurely entering the defrosting mode before the outdoor unit has reached a certain level of frost and needs to enter the defrosting mode, thus preventing the air conditioner from reducing heating efficiency and affecting indoor comfort.

[0051] Although the embodiments of this application divide the preset relative humidity range Rh-range into 4 relative humidity intervals and the preset outdoor temperature range t-range into 6 temperature intervals, and combine the two to form 24 intervals corresponding to different outdoor environmental conditions, this application is not limited to this. Any setting that divides the preset relative humidity range Rh-range and the preset outdoor temperature range t-range into more or fewer relative humidity and temperature intervals, as long as these are combined to form different temperature and relative humidity intervals, should be included within the scope of protection of this application.

[0052] Although the minimum value of the preset relative humidity range Rh-range is about 50% in the example of the implementation method in this application, this application is not limited to this. Different settings of the minimum value of the preset relative humidity range Rh-range can be determined according to the outdoor environmental conditions of different regions, as well as the air conditioner model and setting conditions, and all of them should be included in the protection scope of this application.

[0053] Meanwhile, in the example of the implementation method of this application, the preset outdoor temperature range t-range is described as -25°C to 7°C, but it is not limited to this. Setting different preset outdoor temperature range t-range according to the outdoor environmental parameters of different regions or the operating conditions of different air conditioners is also within the protection scope of this application.

[0054] Furthermore, although the outdoor unit frost condition is determined by detecting the outdoor fan speed control voltage Vsp in the embodiments of this application, this application is not limited to this. Settings that reflect the outdoor unit frost condition by outdoor unit pressure, temperature and other parameters should also be included in the protection scope of this application.

[0055] Although the embodiments of this application are described in the order of outdoor ambient relative humidity detection step S1, outdoor ambient temperature detection step S2, outdoor fan speed control voltage detection step S3, defrosting condition judgment step S4, and defrosting timing judgment step S5, this is merely an example of the embodiments of this application, and there is no corresponding temporal relationship. Simultaneous execution, or execution of one step first, such as executing defrosting condition judgment step S4 based on the detected outdoor ambient temperature and outdoor ambient relative humidity before executing outdoor fan speed control voltage detection step S3, should also be included within the scope of protection of this application.

[0056] <Second Implementation Method>

[0057] The defrosting control method of the second embodiment of this application, which uses the same name or symbols as the defrosting control method of the above-mentioned embodiments of this application, is the same content and will not be described again here.

[0058] The defrosting control method provided in the second embodiment of this application differs from the defrosting control method provided in the first embodiment in that when the real-time detected outdoor fan speed control voltage Vsp exceeds the theoretical maximum speed control voltage Vspmax, and the difference between the target set speed Vt and the actual speed V of the outdoor fan reaches the preset speed difference ΔV, the air conditioner executes the preset defrosting operation mode.

[0059] Under conditions of high relative humidity Rh and low outdoor temperature t, the degree of frost formation on the outdoor unit will increase, and the motor load of the outdoor fan will also become heavier. When the frost on the outdoor unit becomes thicker, there is a situation where the actual speed V of the outdoor fan fails to reach the target set speed Vt even after the speed control voltage Vsp reaches the theoretical maximum speed control voltage Vspmax. When the outdoor fan speed control voltage Vsp detected in the outdoor fan speed control voltage detection step S3 exceeds the theoretical maximum speed control voltage Vspmax, the actual speed V of the outdoor fan is detected and compared with the target set speed Vt. When the difference between the target set speed Vt and the actual speed V reaches the preset speed difference ΔV, it is determined that the outdoor unit has reached the optimal defrosting time, and the air conditioner is controlled to execute the preset defrosting operation mode.

[0060] Through the above implementation method, when the air conditioner is in a condition where the outdoor relative humidity Rh is high and the outdoor temperature t is low, the outdoor fan speed control voltage Vsp and the actual outdoor fan speed V are detected to comprehensively determine whether the degree of frost on the outdoor unit has reached the optimal defrosting time under the corresponding outdoor environmental conditions. This avoids the problem that when the outdoor relative humidity Rh is high and the outdoor temperature t is low, simply comparing the outdoor fan speed control voltage Vsp with the preset fan speed control voltage Vspn corresponding to different outdoor relative humidity Rh and outdoor temperature t cannot accurately determine the degree of frost on the outdoor unit, or that after the outdoor fan speed control voltage Vsp reaches the theoretical maximum speed control voltage Vspmax, the actual speed V does not reach the target set speed Vt, and the defrosting mode is not entered in time, thus affecting the heat exchange efficiency of the outdoor unit.

[0061] This application does not limit the method of detecting the speed of outdoor fans. Methods such as detecting outdoor fan pulse signals should be included within the scope of protection of this application.

[0062] <Third Implementation Method>

[0063] The defrosting control method of the third embodiment of this application, which uses the same name or symbols as the defrosting control method of the above-mentioned embodiments of this application, is the same content and will not be described again here.

[0064] Figure 2 This is a schematic diagram illustrating the execution steps of the defrosting control method in one embodiment of this application, as shown below. Figure 2 As shown, the defrosting control method provided in the third embodiment of this application differs from the defrosting control method provided in the above embodiments in that, in the defrosting operation mode, when the outdoor fan speed control voltage Vsp is less than the specified minimum speed control voltage Vsp0, the defrosting operation mode is exited.

[0065] When the outdoor unit is in defrosting mode, the outdoor fan speed control voltage detection step S3 still detects the outdoor fan speed control voltage Vsp in real time and compares the detection result with the specified minimum speed control voltage Vsp0. When the outdoor fan speed control voltage Vsp is less than the specified minimum speed control voltage Vsp0, it is determined that the outdoor fan has completed defrosting and the air conditioner is controlled to exit the defrosting mode.

[0066] By using the above method, based on the comparison between the outdoor fan speed control voltage Vsp and the specified minimum speed control voltage Vsp0 detected in real time during the defrosting mode operation, the air conditioner is controlled to exit the defrosting operation mode in a timely manner. This avoids problems such as inaccurate defrosting end time, premature defrosting leading to incomplete defrosting and affecting the air conditioner's heating capacity, or premature defrosting end time leading to the absorption of more indoor heat, affecting the air conditioner's heating effect, reducing air conditioner energy efficiency, and affecting indoor thermal comfort.

[0067] In a preferred embodiment of this application, the minimum speed control voltage Vsp0 is defined as the minimum speed control voltage of the outdoor fan that is detected and recorded when there is no frost.

[0068] When the air conditioner is running in defrost mode, the outdoor fan operates at its minimum speed to prevent frost buildup. The minimum speed control voltage of the outdoor fan is detected and recorded as the specified minimum speed control voltage Vsp0. During the defrost mode operation, the outdoor fan speed control voltage Vsp is compared with the specified minimum speed control voltage Vsp0 to determine whether the air conditioner has completed defrosting. This allows for more accurate control of the air conditioner to exit defrost mode in a timely manner when the outdoor unit has completed defrosting. This avoids problems such as inaccurate defrosting end time, premature end of defrosting leading to incomplete defrosting and affecting the air conditioner's heating capacity, or premature end of defrosting leading to the absorption of more heat from the indoor side, affecting the air conditioner's heating effect, reducing air conditioning energy efficiency, and affecting indoor thermal comfort.

[0069] <Fourth Implementation Method>

[0070] The fourth embodiment of this application provides a defrosting control device. In this embodiment, the same names or symbols are used to describe the defrosting control methods as described in the above embodiments of this application. They are all the same content and will not be repeated here.

[0071] Figure 3 This is a schematic diagram of a defrosting control device module in one embodiment of this application, as shown below. Figure 3 As shown, the defrosting control device involved in this embodiment includes: an outdoor ambient relative humidity detection module 1, an outdoor ambient temperature detection module 2, an outdoor fan speed control voltage detection module 3, a defrosting condition judgment module 4, and a defrosting timing judgment module 5.

[0072] In this embodiment, when the air conditioner is running in heating mode, the outdoor relative humidity detection module 1 executes the outdoor relative humidity detection step S1 to detect the outdoor relative humidity Rh of the outdoor unit. The outdoor ambient temperature detection module 2 executes the outdoor ambient temperature detection step S2 to detect the outdoor ambient temperature t of the outdoor unit. After obtaining the outdoor relative humidity Rh and the outdoor ambient temperature t, the defrosting condition judgment module 4 executes the defrosting condition judgment step S4, comparing the real-time detected outdoor relative humidity Rh and outdoor ambient temperature t with the preset relative humidity range Rh-range and the preset outdoor temperature range t-range. If the outdoor ambient temperature t is less than the maximum value of the outdoor temperature range t-range, i.e., the maximum temperature at which the outdoor unit may begin to frost (e.g., 7°C), and the outdoor relative humidity Rh is greater than the minimum value Rh-min of the preset relative humidity range Rh-range (e.g., 50%), then it is determined that the outdoor unit may need to defrost. When the defrosting condition judgment module 4 determines that the outdoor unit may need defrosting, the outdoor fan speed control voltage detection module 3 executes the outdoor fan speed control voltage detection step S3 to detect the outdoor fan speed control voltage Vsp of the outdoor unit in real time. After obtaining the outdoor fan speed control voltage Vsp, the defrosting timing judgment module 5 executes the defrosting timing judgment step S5. Based on the judgment result of the defrosting condition judgment module 4 and the comparison result between the detected outdoor fan speed control voltage Vsp and the preset fan speed control voltage Vspn, the timing for starting defrosting is determined.

[0073] Specifically, in this embodiment, the outdoor relative humidity detection module 1 controls the execution of the outdoor relative humidity detection step S1 in any one of the first to third embodiments; similarly, the outdoor temperature detection module 2 controls the execution of the outdoor temperature detection step S2; the outdoor fan speed control voltage detection module 3 controls the execution of the outdoor fan speed control voltage detection step S3; the defrosting condition judgment module 4 controls the execution of the defrosting condition judgment step S4; and the defrosting timing judgment module 5 controls the execution of the defrosting timing judgment step S5.

[0074] In this application embodiment, an air conditioner with a control device is also provided, wherein the control device performs any of the above-described defrosting control methods.

[0075] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A defrosting control method for defrosting control of an outdoor unit of an air conditioner, characterized in that, include: The outdoor relative humidity detection procedure involves detecting the relative humidity Rh of the outdoor environment where the outdoor unit is located. The outdoor ambient temperature detection step involves detecting the outdoor ambient temperature t where the outdoor unit is located. The outdoor fan speed control voltage detection step involves detecting the outdoor fan speed control voltage Vsp of the outdoor unit. The defrosting condition judgment step is to determine whether there is a possibility of defrosting based on the comparison results between the outdoor relative humidity Rh and the outdoor temperature t and the preset relative humidity range Rh-range and the preset outdoor temperature range t-range. The defrosting timing determination step determines the timing for starting defrosting based on the determination result of the defrosting condition determination step and the comparison result of the detected outdoor fan speed control voltage Vsp and the preset fan speed control voltage Vspn.

2. The defrosting control method according to claim 1, characterized in that, The preset fan speed control voltage Vspn is set in conjunction with the preset relative humidity range Rh-range and the preset outdoor temperature range t-range.

3. The defrosting control method according to claim 2, characterized in that, The preset fan speed control voltage Vspn is set to match the preset relative humidity range and the preset outdoor temperature range, corresponding to the preset frost thickness of the outdoor unit.

4. The defrosting control method according to claim 3, characterized in that, The preset fan speed control voltage Vspn is the theoretical maximum speed control voltage Vspmax of the outdoor fan within the corresponding preset relative humidity range and preset outdoor temperature range.

5. The defrosting control method according to claim 1, characterized in that, In the defrosting condition determination step, if the outdoor relative humidity and the outdoor temperature do not fall within the preset relative humidity range and the preset outdoor temperature range, it is determined that defrosting is not required, and the defrosting timing determination step is not executed.

6. The defrosting control method according to claim 1, characterized in that, In the defrosting timing determination step, when the detected outdoor fan speed control voltage Vsp reaches the preset fan speed control voltage Vspn, the air conditioner executes the preset defrosting operation mode.

7. The defrosting control method according to claim 4, characterized in that, When the outdoor fan speed control voltage Vsp exceeds the theoretical maximum speed control voltage Vspmax, and the difference between the target set speed Vt and the actual speed V of the outdoor fan reaches the preset speed difference ΔV, the air conditioner executes the preset defrosting operation mode.

8. The defrosting control method according to any one of claims 6 or 7, characterized in that, In the defrosting operation mode, when the outdoor fan speed control voltage Vsp is less than the specified minimum speed control voltage Vsp0, the defrosting operation mode is exited.

9. The defrosting control method according to claim 8, characterized in that, The specified minimum speed control voltage Vsp0 is the minimum speed control voltage of the outdoor fan detected and recorded under conditions of no frost formation.

10. A defrosting control device for defrosting control of an outdoor unit of an air conditioner, characterized in that, include: The outdoor relative humidity detection module detects the relative humidity Rh of the outdoor environment where the outdoor unit is located; The outdoor ambient temperature detection module detects the outdoor ambient temperature t where the outdoor unit is located; The outdoor fan speed control voltage detection module detects the outdoor fan speed control voltage Vsp of the outdoor unit. The defrosting condition judgment module determines whether defrosting is necessary based on the comparison results between the outdoor relative humidity Rh and the outdoor temperature t and the preset relative humidity range Rh-range and the preset outdoor temperature range t-range. The defrosting timing determination module determines the timing for starting defrosting based on the determination result of the defrosting condition determination module and the comparison result of the detected outdoor fan speed control voltage Vsp and the preset fan speed control voltage Vspn.

11. An air conditioner, characterized in that, It has the defrosting control device as described in claim 10.

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