CN107289576B - Defrosting control method for air conditioner - Google Patents

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method of an air conditioner. In order to more accurately judge the time of entering defrosting, the defrosting control method of the air conditioner comprises the following steps: detecting the temperature of the coil pipe of the outdoor unit under the condition that the air conditioner is in a heating working condition; acquiring an attenuation value of the temperature of the coil pipe of the outdoor unit every other first preset time; calculating the difference between the obtained attenuation values of the outdoor unit coil temperature; acquiring the relative humidity of the position of the outdoor unit; and judging whether the air conditioner enters a defrosting mode or not according to the difference between the attenuation values of the temperature of the coil pipe of the outdoor unit based on the relative humidity of the position of the outdoor unit. Due to the influence of the relative humidity on the frosting of the air conditioner, when the relative humidity is added as a judgment condition and the defrosting time is judged by utilizing the difference value between the attenuation values of the outdoor unit coil temperature, the defrosting time can be selected more accurately, and the false defrosting phenomenon is effectively avoided.

Description

Air conditioner defrosting control method

technical field

The invention belongs to the technical field of air conditioners, and in particular relates to a defrosting control method for an air conditioner.

Background technique

As a device that can adjust the indoor ambient temperature, the air conditioner works as follows: the indoor ambient temperature is lowered or raised by the refrigerant passing through the high-pressure/low-pressure/gaseous/liquid state transition between the circulation pipes, that is, From the perspective of the indoor unit, the air conditioner is in cooling or heating mode. When the air conditioner is in heating mode, frost is easy to form on the coil of the outdoor unit (evaporator) of the air conditioner, and the frost on the coil of the outdoor unit will reduce the performance of the refrigeration system, thereby affecting the heating effect of the air conditioner. Reduce the comfort of the indoor environment and affect the user experience. Therefore, when the air conditioner is in the heating condition, it is necessary to timely and effectively defrost the outdoor unit coil of the air conditioner.

In order to solve the frosting problem of the air conditioner, in the prior art, refrigeration defrosting (reversing the direction of the four-way valve, reverse circulation) or bypass defrosting (extracting the circuit from the high pressure end of the compressor to the outdoor unit of the air conditioner) is generally used. way to defrost the outdoor unit of the air conditioner. Among them, when the refrigeration and defrosting method is adopted, the indoor ambient temperature will drop significantly, thereby reducing the heating effect of the air conditioner, affecting the comfort of the indoor environment, that is, sacrificing the user experience. When the bypass defrosting method is adopted, the refrigerant will continue to enter the indoor unit of the air conditioner for heating, that is, the air conditioner can still be maintained in the heating condition. Therefore, the bypass defrosting method has been widely used in recent years. Based on the determination of the defrosting method, in order to ensure that the heating efficiency of the indoor environment is not affected, false defrosting should be avoided as much as possible (the defrosting conditions are met, but due to reasons such as low air humidity, the unit at this time does not actually Frosting) or excessive defrosting (the conditions for continuing defrosting are met, but due to the relatively high air temperature, the unit has actually completed defrosting at this time). In view of this, it is very important to choose the right defrosting timing. The current defrosting method usually needs to introduce the ambient temperature. For example, it can be determined by setting several outdoor ambient temperature intervals and setting a fixed temperature difference (the difference between the ambient temperature and the outdoor unit coil temperature) in each interval. Put the air conditioner into defrost mode. However, this method will have errors in judging the timing of entering the defrosting, and often there will be false defrosting or excessive defrosting.

Therefore, there is a need in the art for a new defrosting control method to solve the above problems.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problems in the prior art, that is, in order to more accurately determine the timing of entering the defrosting process, the present invention proposes a defrosting control method for an air conditioner. The air conditioner defrosting control method includes the following steps: when the air conditioner is in In the case of the heating condition, the temperature of the outdoor unit coil is detected; the attenuation value of the outdoor unit coil temperature is obtained every first preset time; the difference between the obtained outdoor unit coil temperature attenuation values is calculated; Obtain the relative humidity of the location of the outdoor unit; based on the relative humidity of the location of the outdoor unit, and according to the difference between the attenuation values of the coil temperature of the outdoor unit, determine whether to put the air conditioner into the defrost mode.

In a preferred embodiment of the above air conditioner defrosting control method, "based on the relative humidity of the location where the outdoor unit is located, according to the difference between the attenuation values of the coil temperature of the outdoor unit, it is judged whether to make the air conditioner enter the defrosting mode. The step of "frost mode" specifically includes: judging whether the relative humidity of the location where the outdoor unit is located is greater than a preset humidity threshold, and in the case where the relative humidity of the location where the outdoor unit is located is greater than the preset humidity threshold, if the outdoor unit is located If the difference between the attenuation values of the unit coil temperature is greater than the first set threshold, the air conditioner will enter the defrost mode, otherwise, the defrost mode will not be entered; the relative humidity at the location of the outdoor unit is not greater than In the case of the preset humidity threshold value, if the difference between the attenuation values of the outdoor unit coil temperature is greater than the second preset threshold value, the air conditioner will enter the defrost mode, otherwise, the defrost mode will not be entered. model;

In a preferred embodiment of the above air conditioner defrosting control method, the preset humidity threshold is any value within 60%-80%.

In a preferred embodiment of the above air conditioner defrosting control method, the first preset time is any value within the range of 10-20 seconds.

In a preferred embodiment of the above air conditioner defrosting control method, the preset humidity threshold is 70%, and the first preset time is 15 seconds.

In a preferred embodiment of the above air conditioner defrosting control method, the second set threshold is greater than the first set threshold, and/or the first set threshold is 1 degree Celsius, and the second set threshold is The set threshold is 2 degrees Celsius.

In a preferred embodiment of the above air conditioner defrosting control method, the defrosting control method further includes a step of judging whether to exit the defrosting mode, the step including: after the air conditioner enters the defrosting mode, comparing the outdoor The temperature of the machine coil and the third set threshold; according to the comparison result, it is judged whether to exit the defrost mode.

In a preferred embodiment of the above air conditioner defrosting control method, the step of "judging whether to exit the defrosting mode according to the comparison result" further includes: in the case that the temperature of the outdoor unit coil is greater than the third set threshold , judge whether the duration of the state is greater than the second preset time, if the duration of the state is greater than the second preset time, the air conditioner will exit the defrosting mode; if the duration of the state is not greater than the If the second preset time is set, the air conditioner is maintained in the defrosting condition.

In a preferred embodiment of the above air conditioner defrosting control method, the third preset threshold is any value within the range of 6-10 degrees Celsius; and/or the second preset time is within the range of 30-60 seconds any value.

In a preferred embodiment of the above air conditioner defrosting control method, the defrosting mode is a bypass defrosting mode in which the outdoor unit coil is defrosted by turning on the bypass branch; The step of obtaining the relative humidity at the air outlet of the outdoor unit specifically includes obtaining the relative humidity at the air outlet of the outdoor unit.

In the technical solution of the present invention, based on the relative humidity of the location where the outdoor unit is located, it is determined whether to enter the defrost mode of the air conditioner according to the difference between the attenuation values of the coil temperature of the outdoor unit. Specifically, the inventor has found that, as more and more frost is formed on the outdoor unit coil, the temperature of the outdoor unit coil will be greatly attenuated, and this attenuation will accelerate with the increase of the thickness of the frost layer. the trend of. Therefore, obtaining the difference between the attenuation values of the outdoor unit coil temperature is equivalent to obtaining the attenuation acceleration of the outdoor unit coil temperature. Compared with the simple attenuation value or attenuation speed, the outdoor unit can be more accurately judged by the attenuation acceleration. Frost level of the coil. On this basis, considering the influence of relative humidity on the frosting of the air conditioner, that is, when the relative humidity of the location of the outdoor unit is different, the amount of frosting of the outdoor unit corresponding to the temperature decay rate of the outdoor unit coil is also different. Therefore, adding After determining the relative humidity, the difference between the attenuation values of the outdoor unit coil temperature can be used to determine the defrosting timing, which can more accurately select the defrosting timing and effectively avoid false defrosting. In addition, when defrosting is performed in the present invention, a bypass defrosting method is selected. In this way, in the process of bypass defrosting, the compressor does not stop, the four-way valve does not change direction, and the air conditioner operates continuously. Heating can greatly ensure the heating effect of the air conditioner and minimize the fluctuation of indoor temperature.

Description of drawings

Fig. 1 is the structural representation of the existing air conditioner;

Fig. 2 is the main step flow chart of the air conditioner defrosting control method of the present invention;

3 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;

FIG. 4 is a flow chart of the specific steps of the defrosting control method for the air conditioner of the present invention.

Detailed ways

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention. For example, although the various steps of the method of the present invention are described in this application in a specific order, these orders are not limiting, and those skilled in the art may perform different orders without departing from the basic principles of the present invention. Perform the described steps.

Based on the timing problem of entering defrosting proposed in the background art, the present invention proposes a defrosting control method for an air conditioner, which aims to make the air conditioner enter the defrosting mode at a suitable defrosting time to avoid false defrosting and defrosting. Over-frost and other phenomena, so as to minimize or even avoid the reduction of air-conditioning heating effect caused by defrosting.

First, please refer to FIG. 1 , which is a schematic structural diagram of a conventional air conditioner. As shown in FIG. 1 , the air conditioner mainly includes an outdoor unit 1 , an indoor unit 2 , a compressor 3 , a four-way valve 4 , and a throttle device 5 . For those skilled in the art, the structure of the air conditioner belongs to the well-known technology and will not be described in detail here.

2, the defrosting control method of the present invention includes the following steps: S110, when the air conditioner is in a heating condition, detecting the temperature of the coil of the outdoor unit; S120, obtaining an outdoor unit every first preset time Attenuation value of the coil temperature; S130, calculate the difference between the obtained attenuation values of the coil temperature of the outdoor unit; S140, obtain the relative humidity of the location of the outdoor unit; S150, based on the relative humidity of the location of the outdoor unit, according to the outdoor unit The difference between the attenuation values of the unit coil temperature is used to determine whether to put the air conditioner into defrost mode.

A description of relative humidity, relative humidity, expresses the ratio of the absolute humidity in the air to the saturated absolute humidity at the same temperature, and the number is a percentage. (That is, the ratio of the mass of water vapor contained in a humid air to the mass of water vapor contained in saturated air at the same temperature, and this ratio is expressed as a percentage). Relative humidity is expressed in RH. The definition of relative humidity is the percentage of water vapor density (represented by d1) actually contained in unit volume of air and saturated water vapor density (represented by d2) at the same temperature, that is, RH (%)=d1/d2x 100%; A calculation method is: the percentage of the actual air water pressure (represented by p1) and the saturated water pressure (represented by p2) at the same temperature, that is, RH(%)=p1/p2x 100%. In this embodiment, the relative humidity of the location where the outdoor unit is located may be acquired by arranging a humidity sensor on the outdoor unit.

In the above steps S110-S150, when judging whether to put the air conditioner into the defrosting mode, first determine the relative humidity of the location where the outdoor unit is located, then according to the value of the relative humidity, and then according to the difference between the attenuation values of the coil temperature of the outdoor unit The difference is used to judge whether to defrost the outdoor unit coil. Specifically, the inventor has found that the temperature of the outdoor unit coil will be greatly attenuated as more and more frost is formed on the outdoor unit coil, and the temperature of the outdoor unit coil will be greatly reduced. The attenuation tends to accelerate with the increase of frost thickness. That is to say, as the thickness of the frost layer increases, the attenuation value of the outdoor unit coil will become larger and larger within the preset time. Therefore, by judging the difference between the attenuation values of the outdoor unit coil temperature, The degree of frost formation on the outdoor unit can be accurately judged. On this basis, considering the effect of relative humidity on the frosting of the air conditioner, that is, when the relative humidity of the location of the outdoor unit is different, the amount of frosting of the outdoor unit corresponding to the temperature decay speed of the outdoor unit coil is also different. Therefore, After adding the judgment condition of relative humidity, the difference between the temperature attenuation values of the outdoor unit coil is used to judge the defrosting timing, which can more accurately select the defrosting timing and effectively avoid the false defrosting phenomenon. Those skilled in the art can understand that, under the premise of adding relative humidity, when judging whether to enter the defrosting process only based on the decay speed, if the air conditioner decays at a certain moment due to changes in itself or the outside world during the operation of the air conditioner If the speed reaches the time to enter the defrosting, and then returns to normal again (that is, the change in the decay speed at this moment is an abnormal change), then according to the decay speed at this moment, the air conditioner enters the defrost, which will cause False defrost phenomenon. During the operation of the air conditioner, if this happens many times, it will cause frequent defrosting. In order to avoid this situation, the present invention determines whether to defrost the outdoor unit coil by the difference between the attenuation values of the outdoor unit coil temperature under the premise of adding relative humidity, so that the outdoor unit coil can be accurately determined. Therefore, the defrosting timing can be selected more accurately, and the false defrosting phenomenon caused by instantaneous frost can be effectively avoided.

The above steps S110-S150 will be described in further detail below.

In step S110, the temperature of the outdoor unit coil may be detected in real time by a temperature sensor disposed on the outdoor unit coil, or the temperature of the outdoor unit coil may be obtained by other known means, all without departing from the protection scope of the present invention.

In step S120, preferably, the first preset time can be any value within the range of 10-20 seconds. For example, the first preset time can be set to 10 seconds, 15 seconds, 20 seconds, etc., and those skilled in the art can select an appropriate first preset time according to the actual application scenario. In a preferred embodiment of the present invention, the first preset time is 15 seconds, that is, the temperature of the outdoor unit coil is acquired every 15 seconds. Then, the attenuation value of the outdoor unit coil temperature within 15 seconds ΔT=T _i -T _i+1 .

In step S130, based on the attenuation value of the outdoor unit coil temperature obtained in step S120, the outdoor unit outer coils that can be obtained within 30 seconds are ΔT ₁ and ΔT ₂ . The difference N=ΔT ₁ −ΔT ₂ .

In step S140, the relative humidity value of the location where the outdoor unit is located is acquired by setting a humidity sensor on the outdoor unit. Relative humidity is expressed in HR. In this embodiment, a humidity sensor is set at the air outlet of the outdoor unit to obtain the relative humidity at the air outlet of the outdoor unit, and the relative humidity at the air outlet of the outdoor unit is used as a basis for judging the defrosting timing.

In step S150, based on the relative humidity at the air outlet of the outdoor unit and the difference between the attenuation values of the coil temperature of the outdoor unit, it is determined whether to put the air conditioner into the defrosting mode. For example, in the case of HR>70%, determine whether the difference between the attenuation values of the outdoor unit coil temperature is greater than the first set threshold, if the difference between the attenuation values of the outdoor unit coil temperature is greater than The first set threshold, the air conditioner will enter the defrosting mode; if the difference between the attenuation values of the outdoor unit coil temperature is not greater than the first set threshold, the air conditioner will maintain the heating condition and not enter Defrost mode. Preferably, the first set threshold is 1 degree Celsius. Then, in this case (HR>70%), when the difference between the attenuation values of the outdoor unit coil temperature is N=ΔT ₁ -ΔT ₂ >1 degree Celsius, the defrosting mode is entered. Otherwise, that is, N is not greater than 1 degree Celsius, it means that the air conditioner has not reached the optimal defrosting time, so that the air conditioner maintains the heating condition and does not enter the defrosting mode.

In the case of HR≤70%, judge whether the difference between the attenuation values of the outdoor unit coil temperature is greater than the second set threshold, if the difference between the attenuation values of the outdoor unit coil temperature is greater than the second set threshold If the difference between the attenuation values of the outdoor unit coil temperature is not greater than the second set threshold, the air conditioner will maintain the heating condition and not enter the defrost mode. Preferably, the second set threshold is 2 degrees Celsius. Then, in this case (HR>70%), when the difference between the attenuation values of the outdoor unit coil temperature is N=ΔT ₁ -ΔT ₂ >2 degrees Celsius, the defrosting mode is entered. Otherwise, that is, N is not greater than 2 degrees Celsius, it means that the air conditioner has not reached the optimal defrosting time, so that the air conditioner maintains the heating condition and does not enter the defrosting mode.

It should be noted that although the first set threshold is 1 and the second set threshold is 2, those skilled in the art can set other suitable thresholds according to actual application scenarios, for example, the first set threshold is set to 1.5 degrees Celsius, the second set threshold is set to 2.5 degrees Celsius, etc. Since the setting of the first set threshold (when HR>70%) and the setting of the second set threshold (when HR≤70%) are both set based on relative humidity, when the relative humidity is high, frost will also occur. It is relatively easy, therefore, under normal circumstances, the first set threshold value is smaller than the second set threshold value, so as to achieve the purpose of more accurately judging the timing of entering the defrost. In addition, the value of the relative humidity above can also be set according to the specific usage scenario of the air conditioner.

To sum up, the present invention determines whether to enter the defrost mode by detecting the temperature of the coil of the outdoor unit and the relative humidity at the air outlet of the outdoor unit, based on the relative humidity and the difference between the attenuation values of the coil temperature of the outdoor unit. . As more and more frost is formed on the outdoor unit coil, the temperature of the outdoor unit coil will be greatly attenuated, and this attenuation will accelerate as the thickness of the frost layer increases. Therefore, compared with obtaining the decay speed of the outdoor unit coil temperature (that is, the decay value of the outdoor unit coil temperature within a preset time), by obtaining the difference between the decay values of the outdoor unit coil temperature, it is possible to obtain a more accurate Determine the frost level of the outdoor unit coil. On this basis, considering the influence of relative humidity on the frosting of the air conditioner, that is, when the relative humidity at the air outlet of the outdoor unit is different, the amount of frosting of the outdoor unit corresponding to the temperature decay speed of the outdoor unit coil is also different. , after adding the judgment condition of relative humidity, and then using the difference between the temperature attenuation values of the outdoor unit coil to judge the defrosting timing, the defrosting timing can be selected more accurately, and the false defrosting phenomenon can be effectively avoided. In addition, it should also be noted that the above-mentioned first preset time, first set threshold, and second set threshold may all be set according to actual application scenarios, and may also be set by the user.

In addition, the control method of the present invention also includes the step of judging whether to exit the defrosting mode, and this step specifically includes the following sub-steps: Step 1: After the air conditioner enters the defrosting mode, compare the temperature of the outdoor unit coil with the third set threshold ; Step 2, according to the comparison result, determine whether to exit the defrosting mode. The purpose of the above steps 1 and 2 is to determine the timing of exiting the defrosting. During the defrosting process, the heating effect of the air conditioner will be more or less reduced, thereby affecting the comfort of the indoor environment. Therefore, choosing an appropriate time to exit the defrosting mode can shorten the defrosting time as much as possible on the premise of ensuring the defrosting effect, thereby reducing the impact on the heating effect of the air conditioner.

Specifically, the third set threshold may be any value within the range of 6-10 degrees Celsius. In a preferred embodiment of the present invention, the third set threshold is 8 degrees Celsius. In the defrosting mode, when it is detected that the outdoor unit coil temperature Ti>8 degrees Celsius, it is then determined whether the duration of the state of the outdoor unit coil temperature Ti>8 reaches the second preset time. The second preset time can be any value in the range of 30-60 seconds. In a preferred embodiment of the present invention, the second preset time is 40 seconds, then, when the state of the outdoor unit coil temperature Ti>8 continues for more than 40 seconds, it is determined that the defrosting has been completed, and at this time, the defrosting is selected to exit . When the outdoor unit coil temperature Ti is not greater than 8, or the outdoor unit coil temperature Ti is greater than 8 but the duration does not exceed 40 seconds, it is judged that the defrosting has not been completed, and the defrosting mode is continued at this time.

It should be noted that, in the above embodiment, although the condition for exiting defrosting is that the temperature of the outdoor unit coil is greater than 8 degrees Celsius and lasts for 40 seconds, those skilled in the art can also set the condition for exiting defrosting to the above according to the actual application scenario. Other thresholds within the range can be used as long as the timing of exiting defrost can be accurately determined.

As described above, in the defrost mode, it is determined whether to exit the defrost mode by comparing the detected temperature of the outdoor unit coil with the third set threshold. Since the temperature difference of the outdoor unit coil before and after frosting is relatively large, it can be more accurately judged whether the defrosting is completed according to the temperature change of the outdoor unit coil, so that the defrosting time can be shortened as much as possible on the premise of ensuring the defrosting effect. Reduce the impact on the heating effect of the air conditioner. In addition, it should also be noted that the above-mentioned second preset time and third set threshold can be set according to actual application scenarios, and can also be set by the user.

In a preferred embodiment, the air conditioner has a bypass branch, and the defrosting mode is a bypass defrosting mode in which the outdoor unit coil is defrosted by turning on the bypass branch. Specifically, referring to FIG. 3 , FIG. 3 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention. As shown in FIG. 3 , in this embodiment, the air conditioner mainly includes an outdoor unit 1, an indoor unit 2, a compressor 3, a four-way valve 4, a throttle device 5 (an electronic expansion valve in this embodiment), and a communication The bypass branch 6 of the compressor 3 and the outdoor unit 1 is provided with a one-way bypass valve, such as a solenoid valve 61 . If defrost conditions are reached, the bypass defrost mode is entered. If the exit defrost condition is reached, the bypass defrost mode is exited. The specific operation steps of the present invention will be described in detail below on the basis of FIG. 3 and in conjunction with FIG. 4 .

Fig. 4 shows a flow chart of specific steps of a preferred embodiment of the defrosting control method of the present invention. As shown in Figure 4, when the air conditioner is in heating operation, the outdoor unit coil temperature T _i is detected every 15 seconds, and the attenuation value of the outdoor unit coil temperature ΔT=T _i -T _i+1 , 30 After two attenuation values ΔT ₁ and ΔT ₂ are obtained within seconds, the difference N=ΔT ₁ −ΔT ₂ is calculated.

Obtain the relative humidity HR of the air outlet of the outdoor unit, and determine whether the HR is greater than 70%. In the case that HR is greater than 70%, it is judged whether N satisfies the condition: N>1 degree Celsius. If the conditions are met, the bypass defrost will be entered; if the conditions are not met, the defrost mode will not be entered. In the case that HR is not greater than 70%, it is judged whether N satisfies the condition: N>2 degrees Celsius. If the conditions are met, the bypass defrost will be entered; if the conditions are not met, the defrost mode will not be entered.

Specifically, when N satisfies the conditions for entering defrosting, the air conditioner sends an opening control command to the solenoid valve 61, the solenoid valve 61 opens, and part of the high-temperature and high-pressure refrigerant gas discharged from the compressor 3 enters the indoor unit 2 through the four-way valve 4 to continue. For heating, the other part directly enters the outdoor unit 1 through the bypass branch 6 . The high-temperature and high-pressure refrigerant gas can raise the body temperature of the outdoor unit 1 in a short period of time to melt the frost. In this way, during the bypass defrosting process, the compressor 3 does not stop, the four-way valve 4 does not reverse direction, and the air conditioner continuously heats, which can greatly ensure the heating effect of the air conditioner and make the indoor temperature Less volatility. When N does not meet the conditions, it does not enter the defrost mode, and then enters the defrost mode until N meets the conditions.

Continue to refer to FIG. 4 , during the defrosting process, the temperature Ti of the outdoor unit coil is continuously _detected , and it is judged in real time whether the temperature Ti of the outdoor unit _coil is greater than 8 degrees Celsius. When defrosting is completed, you can choose to exit defrosting. If not, continue defrosting. When the defrosting is exited, the air conditioner sends a closing control command to the solenoid valve 61, the solenoid valve 61 is closed, and all the high temperature and high pressure refrigerant gas discharged from the compressor 3 enters the indoor unit 2 for heating through the four-way valve 4.

It should be noted that, in order to shorten the defrosting time and improve the defrosting efficiency, during the bypass defrosting, the outdoor fan can be turned off, so that most of the heat of the high temperature and high pressure refrigerant gas is used for defrosting. When exiting the defrost operation, turn the outdoor fan on again.

Although the above embodiments are described by taking the bypass defrosting as an example, the defrosting control method of the present invention is not limited to a specific defrosting method, and those skilled in the art can select a suitable defrosting method according to the specific structure of the air conditioner , such as the use of reverse cycle defrosting, reverse cycle and bypass alternate defrosting and other methods. The present invention aims to provide a method capable of more accurately judging the timing of entering and exiting defrosting.

So far, the technical solutions of the present invention have been described with reference to the preferred embodiments shown in the accompanying drawings, however, those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims (10)

1. A defrosting control method for an air conditioner, wherein the defrosting control method comprises the following steps: When the air conditioner is in the heating condition, check the temperature of the outdoor unit coil; Obtain the attenuation value of the coil temperature of the outdoor unit every first preset time; Calculate the difference between the attenuation values of the outdoor unit coil temperature obtained; Obtain the relative humidity of the location where the outdoor unit is located; Based on the relative humidity of the location where the outdoor unit is located, and according to the difference between the attenuation values of the coil temperature of the outdoor unit, it is judged whether to put the air conditioner into the defrost mode; this step specifically includes: determining whether the relative humidity of the location where the outdoor unit is located is greater than a preset humidity threshold; In a situation where the relative humidity of the location where the outdoor unit is located is greater than the preset humidity threshold, if the difference between the attenuation values of the coil temperature of the outdoor unit is greater than the first set threshold, the air conditioner is turned on. enter defrost mode; Under the condition that the relative humidity of the location where the outdoor unit is located is not greater than the preset humidity threshold, if the difference between the attenuation values of the coil temperature of the outdoor unit is greater than the second set threshold, the air conditioner is turned on. the device enters the defrost mode; Wherein, the second set threshold is greater than the first set threshold. 2. The air conditioner defrosting control method according to claim 1, characterized in that "based on the relative humidity of the location where the outdoor unit is located, according to the difference between the attenuation values of the coil temperature of the outdoor unit, determine Whether to put the air conditioner into defrost mode" specifically includes: judging whether the relative humidity of the location where the outdoor unit is located is greater than a preset humidity threshold, In a situation where the relative humidity of the location where the outdoor unit is located is greater than the preset humidity threshold, if the difference between the attenuation values of the coil temperature of the outdoor unit is not greater than the first set threshold, the air conditioner is turned on. does not enter the defrost mode; In the case where the relative humidity of the location where the outdoor unit is located is not greater than the preset humidity threshold, if the difference between the attenuation values of the coil temperature of the outdoor unit is not greater than the second preset threshold, the The air conditioner does not enter defrost mode. 3 . The defrosting control method for an air conditioner according to claim 2 , wherein the preset humidity threshold is any value within 60%-80%. 4 . 4 . The defrosting control method for an air conditioner according to claim 3 , wherein the first preset time is any value within the range of 10-20 seconds. 5 . 5 . The defrosting control method for an air conditioner according to claim 4 , wherein the preset humidity threshold is 70%, and the first preset time is 15 seconds. 6 . 6. The air conditioner defrosting control method according to claim 5, wherein, The first set threshold is 1 degree Celsius, and the second set threshold is 2 degrees Celsius. 7. The air conditioner defrosting control method according to any one of claims 1 to 6, wherein the defrosting control method further comprises the step of judging whether to exit the defrosting mode, the step comprising: comparing the temperature of the outdoor unit coil with a third set threshold after the air conditioner enters the defrost mode; According to the comparison result, it is judged whether to exit the defrost mode. 8. The air conditioner defrosting control method according to claim 7, wherein the step of "judging whether to exit the defrosting mode according to the comparison result" further comprises: In the case that the temperature of the outdoor unit coil is greater than the third preset threshold, determine whether the duration of the state is greater than the second preset time, if the duration of the state is greater than the second preset time, causing the air conditioner to exit the defrosting mode; If the duration of the state is not greater than the second preset time, the air conditioner is maintained in the defrosting condition. 9 . The air conditioner defrosting control method according to claim 8 , wherein the third preset threshold is any value within the range of 6-10 degrees Celsius; and/or the second preset time is 30 . -Any value in the range of 60 seconds. 10. The air conditioner defrosting control method according to any one of claims 1 to 6, wherein the defrosting mode is to defrost the outdoor unit coil by conducting the bypass branch. Bypassing the defrosting mode; and/or the step of "obtaining the relative humidity at the location where the outdoor unit is located" specifically includes acquiring the relative humidity at the air outlet of the outdoor unit.

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