Defrosting control method and device

[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0055] The embodiment of the invention discloses a defrosting control method and device. The defrosting is controlled by the current change rate of the outdoor fan of the air conditioner, so that the operation is simple and the defrosting can be reasonably controlled.

[0056] Such as figure 1 Shown is a defrost control method disclosed in the present invention, including:

[0057] S101. Control the air conditioner to run to a stable state, and maintain the stable state to run for a preset period of time;

[0058] S102, real-time detection of the operating current of the outdoor fan;

[0059] S103: Determine whether the rate of change of the operating current of the outdoor fan under the preset period is less than or equal to the preset value, if yes, proceed to step S104, if otherwise, proceed to step S102:

[0060] S104. Control the air conditioning unit to enter defrosting.

[0061] Specifically, the principle and working process of the defrosting control method disclosed in the above embodiments are as follows: First, power on the air conditioner to make the air conditioner perform heating operation, and detect the flow through the outdoor fan of the air conditioner during heating operation. Current, when the current flowing through the outdoor fan of the air conditioner reaches the rated current, it indicates that the air conditioner has been running to a stable state at this time. In order to avoid frequent defrosting of the unit, when the air conditioner runs to a stable state, the air conditioner is controlled to maintain a stable state for a preset period of time. Then, the operating current of the outdoor fan of the air conditioner is detected in real time, and it is determined whether the rate of change of the operating current of the outdoor fan under the preset period is less than or equal to the preset value, and if so, the air conditioner is controlled to enter defrosting.

[0062] In the defrost control method disclosed in the above embodiments, when the air conditioner runs to a stable state and runs for a period of time, the defrost is controlled by judging the current change rate of the outdoor fan of the air conditioner under a preset period. The temperature of the outdoor pipe and the current value of the outdoor fan are controlled for defrosting, the operation of the invention is simpler, the defrosting is more reasonable, and the effect is better.

[0063] Such as figure 2 Shown here is another defrost control method disclosed in the present invention on the basis of the above-mentioned embodiments, which specifically includes the following steps:

[0064] S201. Control the air conditioner to run to a stable state, and maintain the stable state to run for a preset period of time;

[0065] S202: Detect the operating current of the outdoor fan in real time;

[0066] S203: Determine whether the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value, and if so, proceed to step S204:

[0067] S204. Determine whether the rate of change of the operating current of the outdoor fan in the preset period is less than or equal to the preset value, and if yes, proceed to step S205:

[0068] S205: Control the unit to enter defrosting.

[0069] Specifically, the principle and working process of the defrosting control method disclosed in the above embodiments are as follows: First, power on the air conditioner to make the air conditioner perform heating operation, and detect the flow through the outdoor fan of the air conditioner during heating operation. Current, when the current flowing through the outdoor fan of the air conditioner reaches the rated current, it indicates that the air conditioner has been running to a stable state at this time. In order to avoid frequent defrosting of the unit, when the air conditioner is running to a stable state, the air conditioner is controlled to operate in a stable state for a preset period of time, and then the operating current of the outdoor fan of the air conditioner is detected in real time to determine whether the operating current of the outdoor fan detected in real time is less than or equal to The first preset current value. When the operating current of the outdoor fan is less than or equal to the first preset value, it is further determined whether the rate of change of the outdoor fan's operating current in the preset period is less than or equal to the preset value. The operating current of is less than or equal to the first preset current value, and the rate of change of the operating current of the outdoor fan in the preset period is less than or equal to the preset value, and the unit is controlled to enter defrosting.

[0070] In the defrost control method disclosed in the above embodiments, when the air conditioner runs to a stable state and runs for a period of time, it not only judges the current change rate of the outdoor fan of the air conditioner under the preset period, but also judges whether the operating current of the outdoor fan detected in real time is less than Equal to the first preset current value, only when the rate of change of the outdoor fan's operating current in the preset period is less than or equal to the preset value, and the real-time detected outdoor fan's operating current is less than or equal to the first preset current value, then control The unit enters defrosting. It can be seen that by increasing the conditions of defrosting control, the defrosting control is more reasonable and the effect is better.

[0071] Such as image 3 Shown here is another defrost control method disclosed in the present invention on the basis of the above-mentioned embodiments, which specifically includes the following steps:

[0072] S301. Control the air conditioner to run to a stable state, and maintain the stable state to run for a preset period of time;

[0073] S302, real-time detection of the operating current of the outdoor fan;

[0074] S303: Determine whether the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value, and if so, proceed to step S304:

[0075] S304. Determine whether the rate of change of the operating current of the outdoor fan under the preset period is less than or equal to the preset value, if yes, go to step S307, if not, go to step S302:

[0076] S305: Detect the temperature of the outdoor environment and the temperature of the outdoor pipe;

[0077] S306: Determine whether the temperature of the outdoor environment and the temperature of the outdoor tube meet the first preset condition, if yes, go to step S307, if otherwise, go to step S305:

[0078] S307: When the rate of change of the operating current of the outdoor fan in the preset period is less than or equal to the preset value, and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first preset condition, control the unit to enter defrosting.

[0079] Specifically, the principle and working process of the defrosting control method disclosed in the above embodiments are as follows: firstly, power on the air conditioner to make the air conditioner perform heating operation, and during the heating operation of the air conditioner, detect the current flowing through the outdoor fan of the air conditioner , When the current flowing through the outdoor fan of the air conditioner reaches the rated current, it indicates that the air conditioner has been running to a stable state at this time. In order to avoid frequent defrosting of the unit, when the air conditioner is running to a stable state, the air conditioner is controlled to operate in a stable state for a preset period of time, and then the operating current of the outdoor fan of the air conditioner is detected in real time, and the temperature of the outdoor environment and the temperature of the outdoor pipe of the air conditioner are detected in real time. Then determine whether the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value, and when the operating current of the outdoor fan is less than or equal to the first preset value, further determine the rate of change of the operating current of the outdoor fan under the preset period Whether the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first preset condition, the first preset condition is: when the temperature of the outdoor environment is greater than or equal to T1, the temperature of the outdoor pipe is less than or equal to T2 ; Or when the temperature of the outdoor environment is less than T1, the temperature of the outdoor pipe is less than or equal to T3. When the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value, the rate of change of the operating current of the outdoor fan under the preset period is less than or equal to the preset value, and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first Under preset conditions, the control unit enters defrosting.

[0080] In the defrost control method disclosed in the above embodiments, when the air conditioner runs to a stable state and runs for a period of time, it not only judges the current change rate of the outdoor fan of the air conditioner under the preset period, but also judges whether the operating current of the outdoor fan detected in real time is less than Equal to the first preset current value, to determine whether the outdoor environment temperature and the temperature of the outdoor tube meet the first preset condition, only when the change rate of the outdoor fan's operating current under the preset period is less than or equal to the preset value, real-time detection When the operating current of the outdoor fan is less than or equal to the first preset current value, and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first preset condition, the unit is controlled to enter defrosting. It can be seen that by increasing the conditions of defrosting control, the defrosting control is more reasonable and the effect is better.

[0081] Such as Figure 4 Shown is another defrost control method disclosed in the present invention on the basis of the above-mentioned embodiments, which specifically includes:

[0082] S401. Control the air conditioner to run to a stable state, and maintain the stable state to run for a preset period of time;

[0083] S402, real-time detection of the operating current of the outdoor fan;

[0084] S403: Determine whether the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value, and if so, proceed to step S404:

[0085] S404: Determine whether the rate of change of the operating current of the outdoor fan under the preset period is less than or equal to the preset value, and if yes, proceed to step S407:

[0086] S405: Detect the temperature of the outdoor environment and the temperature of the outdoor pipe;

[0087] S406: Determine whether the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first preset condition, and if so, go to step S407:

[0088] S407: When the rate of change of the operating current of the outdoor fan under the preset period is less than or equal to the preset value, and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first preset condition, control the unit to enter defrosting;

[0089] S408, real-time detection of the operating current of the outdoor fan;

[0090] S409: Detect the temperature of the outdoor environment and the temperature of the outdoor pipe;

[0091] S410: Determine whether the operating current of the outdoor fan is greater than or equal to the second preset current value, if yes, go to step S412, if not, go to step S408:

[0092] S411: Determine whether the temperature of the outdoor environment and the temperature of the outdoor pipe meet the second preset condition, if yes, go to step S412, if otherwise, go to step S409:

[0093] S412: When the operating current of the outdoor fan is greater than or equal to the second preset current value and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the second preset condition, control the unit to exit defrosting.

[0094] Specifically, the principle and working process of the defrosting control method disclosed in the above embodiments are as follows: firstly, power on the air conditioner to make the air conditioner perform heating operation, and during the heating operation of the air conditioner, detect the current flowing through the outdoor fan of the air conditioner , When the current flowing through the outdoor fan of the air conditioner reaches the rated current, it indicates that the air conditioner has been running to a stable state at this time. In order to avoid frequent defrosting of the unit, when the air conditioner is running to a stable state, the air conditioner is controlled to operate in a stable state for a preset period of time, and then the operating current of the outdoor fan of the air conditioner is detected in real time, and the temperature of the outdoor environment and the temperature of the outdoor pipe of the air conditioner are detected in real time. Then determine whether the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value, and when the operating current of the outdoor fan is less than or equal to the first preset value, further determine the rate of change of the operating current of the outdoor fan under the preset period Whether the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first preset condition, the first preset condition is: when the temperature of the outdoor environment is greater than or equal to T1, the temperature of the outdoor pipe is less than or equal to T2 ; Or when the temperature of the outdoor environment is less than T1, the temperature of the outdoor pipe is less than or equal to T3. When the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value, the rate of change of the operating current of the outdoor fan under the preset period is less than or equal to the preset value, and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first Under preset conditions, the control unit enters defrosting.

[0095] When the unit enters defrosting, it will detect the operating current of the outdoor fan in real time, and detect the temperature of the outdoor environment and the temperature of the outdoor pipe, and then determine whether the operating current of the outdoor fan is greater than or equal to the second preset current value, and determine the temperature of the outdoor environment And whether the temperature of the outdoor pipe meets the second preset condition, where the second preset condition is: when the temperature of the outdoor environment is greater than or equal to T4, the temperature of the outdoor pipe is greater than or equal to T5; or when the temperature of the outdoor environment is less than T1, the outdoor The temperature of the tube is greater than or equal to T6. When the operating current of the outdoor fan is greater than or equal to the second preset current value and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the second preset condition, the control unit exits the defrosting.

[0096] In the defrost control method disclosed in the above embodiments, when the air conditioner runs to a stable state and runs for a period of time, it not only judges the current change rate of the outdoor fan of the air conditioner under the preset period, but also judges whether the operating current of the outdoor fan detected in real time is less than Equal to the first preset current value, to determine whether the outdoor environment temperature and the temperature of the outdoor tube meet the first preset condition, only when the change rate of the outdoor fan's operating current under the preset period is less than or equal to the preset value, real-time detection When the operating current of the outdoor fan is less than or equal to the first preset current value, and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first preset condition, the unit is controlled to enter defrosting. When the unit enters defrosting, it will continue to detect the operating current of the outdoor fan, the temperature of the outdoor environment and the temperature of the outdoor tube in real time, and further realize the exit of the defrosting control of the unit. It can be seen that by increasing the conditions of defrosting control, the defrosting control is more reasonable and the effect is better.

[0097] Such as Figure 5 Shown here is a defrosting control device disclosed in the present invention, including: a controller 11, a memory 12, a comparator 13, and a current detector 14; wherein:

[0098] The memory 12 storing the preset time is connected to the controller 11, and the controller 11 controls the air conditioner to run to a stable state, and maintains the stable state to run for a preset period of time;

[0099] The current detector 14 is connected to the controller 11 and the comparator 13 respectively. When the controller 11 controls the air conditioner to maintain stable operation for a preset period of time, the current detector 14 is controlled to detect the operating current of the outdoor fan in real time and send the operating current to Comparator 13;

[0100] The comparator 13 is connected to the controller 11, determines whether the rate of change of the operating current of the outdoor fan in a preset period is less than or equal to a preset value according to the received operating current, and sends the determination result to the controller 11;

[0101] When the judgment result is that the rate of change of the operating current of the outdoor fan in the preset period is less than or equal to the preset value, the air conditioning unit is controlled to enter defrosting.

[0102] Specifically, the working principle of the defrosting control device disclosed in the above embodiment is as follows: First, the air conditioner is powered on to make the air conditioner perform heating operation. During the heating operation of the air conditioner, the current detector 14 detects the flow through the air conditioner. The current of the fan, when the current flowing through the outdoor fan of the air conditioner reaches the rated current, it indicates that the air conditioner has been running to a stable state at this time. In order to avoid frequent defrosting of the unit, when the air conditioner runs to a stable state, the controller 11 controls the air conditioner to operate in a stable state for a preset period of time, where the preset period of time is stored in the memory 12. Then, the controller 11 controls the current detector 14 to detect the operating current of the outdoor fan of the air conditioner in real time, and sends the detected operating current of the outdoor fan to the comparator 13, and the comparator 13 determines that it is in a preset period according to the received operating current. Whether the rate of change of the operating current of the outdoor fan is less than or equal to the preset value, and the judgment result is sent to the controller 11. When the judgment result is that the rate of change of the operating current of the outdoor fan under the preset period is less than or equal to the preset value, The controller 11 controls the air conditioning unit to enter defrosting.

[0103] The defrosting control device disclosed in the above embodiment controls the defrosting by judging the current change rate of the outdoor fan of the air conditioner in a preset period after the air conditioner runs to a stable state and runs for a period of time. The temperature of the outdoor pipe and the current value of the outdoor fan are controlled for defrosting, the operation of the invention is simpler, the defrosting is more reasonable, and the effect is better.

[0104] Such as Image 6 Shown here is another defrosting control device disclosed on the basis of the above-mentioned embodiments of the present invention, including: a controller 21, a memory 22, a comparator 23, a current detector 24 and a temperature sensor 25; among them:

[0105] The memory 22 storing the preset time is connected to the controller 21, and the controller 21 controls the air conditioner to run to a stable state, and maintains the stable state to run for a preset period of time;

[0106] The current detector 24 is respectively connected to the controller 21 and the comparator 23. When the controller 21 controls the air conditioner to maintain stable operation for a preset period of time, the current detector 24 is controlled to detect the operating current of the outdoor fan in real time and send the operating current to Comparator 23;

[0107] The comparator 23 is connected to the controller 21, determines whether the rate of change of the operating current of the outdoor fan in a preset period is less than or equal to a preset value according to the received operating current, and sends the determination result to the controller 21;

[0108] The comparator 23 also judges whether the running current is less than or equal to the first preset current value according to the received running current, and sends the judgment result to the controller 21;

[0109] The temperature sensor 25 detects the temperature of the outdoor environment and the temperature of the outdoor pipe, and sends the temperature of the outdoor environment and the temperature of the outdoor pipe to the comparator 23 connected to it;

[0110] The comparator 23 judges whether the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first preset condition according to the received temperature of the outdoor environment and the temperature of the outdoor pipe, and sends the judgment result to the controller 21;

[0111] When the judgment result is that the rate of change of the operating current of the outdoor fan in the preset period is less than or equal to the preset value, the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value, and the temperature of the outdoor environment and the temperature of the outdoor pipe When the first preset condition is met, the controller 21 controls the air conditioning unit to enter defrosting;

[0112] When the air conditioner unit enters the defrost, the current detector 24 also detects the operating current of the outdoor fan in real time, and sends the operating current of the outdoor fan to the comparator 23 connected to it;

[0113] The temperature sensor 25 also detects the temperature of the outdoor environment and the temperature of the outdoor pipe, and sends the temperature of the outdoor environment and the temperature of the outdoor pipe to the comparator 23 connected to it;

[0114] The comparator 23 also determines whether the operating current of the outdoor fan is greater than the second preset current according to the received operating current of the outdoor fan, and sends the determination result to the controller 21 connected to it;

[0115] The comparator 23 also judges whether the temperature of the outdoor environment and the temperature of the outdoor pipe meet the second preset condition according to the received outdoor environment temperature and the temperature of the outdoor pipe, and sends the judgment result to the controller 21 connected to it;

[0116] When the judgment result is that the operating current of the outdoor fan is greater than or equal to the second preset current value and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the second preset condition, the controller 21 controls the air conditioning unit to exit defrosting.

[0117] Specifically, the working principle of the defrost control device disclosed in the above embodiment is as follows: firstly, the air conditioner is powered on to make the air conditioner perform heating operation. During the heating operation of the air conditioner, the current detector 24 detects the flow through the outdoor fan of the air conditioner When the current flowing through the outdoor fan of the air conditioner reaches the rated current, it indicates that the air conditioner has been running to a stable state at this time. In order to avoid frequent defrosting of the unit, when the air conditioner runs to a stable state, the controller 21 controls the air conditioner to maintain a stable state to run for a preset time, where the preset time is stored in the memory 22. Then the current detector 24 detects the operating current of the outdoor fan of the air conditioner in real time, and sends the detected operating current of the outdoor fan to the comparator 23. The temperature sensor 25 detects the temperature of the outdoor environment and the temperature of the outdoor pipe of the air conditioner, and will detect The temperature of the outdoor environment and the temperature of the outdoor pipe of the air conditioner are sent to the comparator 23. The comparator 23 determines whether the rate of change of the operating current of the outdoor fan in a preset period is less than a preset value according to the received operating current of the outdoor fan, and determines whether the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value , Judging whether the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first preset condition according to the received outdoor environment temperature and the temperature of the outdoor pipe, where the first preset condition is: when the temperature of the outdoor environment is greater than or equal to T1, The temperature of the outdoor pipe is less than or equal to T2; or when the temperature of the outdoor environment is less than T1, the temperature of the outdoor pipe is less than or equal to T3. When the judgment result is that the rate of change of the operating current of the outdoor fan under the preset period is less than or equal to the preset value, the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value, and the temperature of the outdoor environment and the temperature of the outdoor pipe When the first preset condition is met, the controller 21 controls the unit to enter defrosting.

[0118] When the unit enters defrosting, the current detector 24 detects the operating current of the outdoor fan in real time, and sends the detected operating current of the outdoor fan to the comparator 23. The temperature sensor 25 detects the temperature of the outdoor environment and the temperature of the outdoor pipe, and The detected outdoor environment temperature and outdoor pipe temperature are sent to the comparator 23, and the comparator 23 determines whether the outdoor fan operating current is greater than or equal to the second preset current value according to the received outdoor fan operating current, and according to the received The temperature of the outdoor environment and the temperature of the outdoor pipe determine whether the temperature of the outdoor environment and the temperature of the outdoor pipe meet the second preset condition, where the second preset condition is: when the temperature of the outdoor environment is greater than or equal to T4, the temperature of the outdoor pipe It is greater than or equal to T5; or when the temperature of the outdoor environment is less than T1, the temperature of the outdoor pipe is greater than or equal to T6. When the judgment result is that the operating current of the outdoor fan is greater than or equal to the second preset current value and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the second preset condition, the controller 21 controls the unit to exit defrosting.

[0119] The defrost control device disclosed in the above embodiment, when the air conditioner runs to a stable state and runs for a period of time, it not only judges the current change rate of the outdoor fan of the air conditioner under the preset period, but also judges whether the operating current of the outdoor fan detected in real time is less than Equal to the first preset current value, to determine whether the outdoor environment temperature and the temperature of the outdoor tube meet the first preset condition, only when the change rate of the outdoor fan's operating current under the preset period is less than or equal to the preset value, real-time detection When the operating current of the outdoor fan is less than or equal to the first preset current value, and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first preset condition, the unit is controlled to enter defrosting. When the unit enters defrosting, it will continue to detect the operating current of the outdoor fan, the temperature of the outdoor environment and the temperature of the outdoor tube in real time, and further realize the exit of the defrosting control of the unit. It can be seen that by increasing the conditions of defrosting control, the defrosting control is more reasonable and the effect is better.

[0120] Such as Figure 7 Shown is a defrosting control device disclosed in the present invention, including: connected to the outdoor fan of the air conditioner, obtaining the operating current of the outdoor fan in real time, and controlling the defrosting control of the air conditioning unit according to the rate of change of the operating current of the outdoor fan Motherboard 31. Among them: 32 is an outdoor fan, 33 is an outdoor heat exchanger, 34 is a four-way valve, 35 is a compressor, 36 is a gas-liquid separator, and 37 is an indoor heat exchanger.

[0121] Specifically, the working principle of the defrost control device disclosed in the above embodiment is as follows: First, the air conditioner is powered on to make the air conditioner perform heating operation. During the heating operation of the air conditioner, the control main board 31 detects the flow through the air conditioner in real time. The current of the outdoor fan, when the current flowing through the outdoor fan of the air conditioner reaches the rated current, it indicates that the air conditioner has been running to a stable state at this time. In order to avoid frequent defrosting of the unit, when the air conditioner runs to a stable state, the control main board 31 controls the air conditioner to operate in a stable state for a preset period of time, wherein the preset time is stored in the control main board 31. Then, the control main board 31 continues to detect the operating current of the outdoor fan of the air conditioner in real time, and determines whether the rate of change of the operating current of the outdoor fan in the preset period is less than or equal to the preset value according to the detected operating current of the outdoor fan, and when the determination result In order to control the main board 31 to control the air conditioner unit to enter defrosting when the change rate of the operating current of the outdoor fan under the preset period is less than or equal to the preset value.

[0122] Such as Figure 8 As shown, another defrost control device disclosed on the basis of the above-mentioned embodiments of the present invention includes: a control main board 41, an environmental temperature sensor 42 and a tube temperature sensor 43; wherein:

[0123] The control main board 41 is connected with the outdoor fan of the air conditioner to obtain the operating current of the outdoor fan in real time;

[0124] The environmental temperature sensor 42 is set at the grille of the outdoor unit, detects the outdoor environmental temperature in real time, and sends the detected outdoor environmental temperature to the control main board 41 connected to it;

[0125] The tube temperature sensor 43 is set on the copper tube of the condenser, detects the temperature of the outdoor tube in real time, and sends the detected temperature of the outdoor tube to the control main board 41 connected to it;

[0126] The control main board 41 performs defrosting control on the air conditioning unit according to the operating current of the outdoor fan, outdoor ambient temperature and outdoor pipe temperature. Among them: 44 is an outdoor fan, 45 is an outdoor heat exchanger, 46 is a four-way valve, 47 is a compressor, 48 is a gas-liquid separator, and 49 is an indoor heat exchanger.

[0127] Specifically, the working principle of the defrost control device disclosed in the above embodiment is as follows: firstly, the air conditioner is powered on to make the air conditioner perform heating operation. During the heating operation of the air conditioner, the control main board 41 detects the flow through the outdoor fan of the air conditioner. Current, when the current flowing through the outdoor fan of the air conditioner reaches the rated current, it indicates that the air conditioner has been running to a stable state at this time. In order to avoid frequent defrosting of the unit, when the air conditioner runs to a stable state, the control main board 41 controls the air conditioner to operate in a stable state for a preset period of time, and the preset time is stored in the control main board 41. Then the control main board 41 continues to detect the operating current of the outdoor fan of the air conditioner in real time, the environmental temperature sensor 42 detects the temperature of the outdoor environment, and the tube temperature sensor 43 detects the temperature of the outdoor pipe of the air conditioner, and compares the detected outdoor environment temperature to the outdoor air conditioner. The temperature of the tube is sent to the control main board 41. The control main board 41 determines whether the rate of change of the operating current of the outdoor fan in a preset period is less than a preset value according to the received operating current of the outdoor fan, and determines whether the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value , Judging whether the temperature of the outdoor environment and the temperature of the outdoor pipe meet the first preset condition according to the received outdoor environment temperature and the temperature of the outdoor pipe, where the first preset condition is: when the temperature of the outdoor environment is greater than or equal to T1, The temperature of the outdoor pipe is less than or equal to T2; or when the temperature of the outdoor environment is less than T1, the temperature of the outdoor pipe is less than or equal to T3. When the judgment result is that the rate of change of the operating current of the outdoor fan under the preset period is less than or equal to the preset value, the operating current of the outdoor fan detected in real time is less than or equal to the first preset current value, and the temperature of the outdoor environment and the temperature of the outdoor pipe When the first preset condition is met, the control main board 41 controls the unit to enter defrosting.

[0128] When the unit enters defrosting, the control board 41 continues to detect the operating current of the outdoor fan in real time, the environmental temperature sensor 42 detects the temperature of the outdoor environment, the tube temperature sensor detects the temperature of the outdoor pipe, and the detected outdoor environment temperature and The temperature of the outdoor pipe is sent to the control main board 41, and the control main board 41 determines whether the operating current of the outdoor fan is greater than or equal to the second preset current value according to the received operating current of the outdoor fan, and according to the received outdoor environment temperature and outdoor pipe The temperature judges whether the temperature of the outdoor environment and the temperature of the outdoor pipe meet the second preset condition, where the second preset condition is: when the temperature of the outdoor environment is greater than or equal to T4, the temperature of the outdoor pipe is greater than or equal to T5; or when the temperature of the outdoor environment When the temperature is less than T1, the temperature of the outdoor pipe is greater than or equal to T6. When the judgment result is that the operating current of the outdoor fan is greater than or equal to the second preset current value and the temperature of the outdoor environment and the temperature of the outdoor pipe meet the second preset condition, the control main board 41 controls the unit to exit defrosting.

[0129] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0130] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined in this document can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this text, but should conform to the widest scope consistent with the principles and novel features disclosed in this text.