Air conditioner, control method and device thereof, storage medium and computer program product

Abstract

The application discloses a control method and device of an air conditioner, the air conditioner, a storage medium and a computer program product, and relates to the technical field of air conditioners. The method comprises the following steps: after the air conditioner starts a heating mode, a first fan is controlled to be started, a second fan is controlled to be stopped, and the second air inlet is shielded; the first fan and the second fan are alternately started according to the outdoor environment temperature of the air conditioner, the surface temperatures of the first surface and the second surface of the outdoor heat exchanger, and the defrosting of the outdoor heat exchanger is controlled; wherein, the time interval of the alternately starting of the first fan and the second fan is corrected according to the current and the running time of the first fan and the current and the running time of the second fan, and the first fan and the second fan are alternately started according to the corrected time interval. According to the scheme, the defrosting time is prolonged, the defrosting is accurate, and the indoor comfort is improved by judging the defrosting time according to the difference between the outdoor environment temperature and the surface temperature of the outdoor heat exchanger, and correcting the time interval of the alternately starting of the double fans according to the current change of the double fans.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to a control method and device of an air conditioner, the air conditioner, a storage medium and a computer program product, in particular to a control method and device of double-fan operation and defrosting of an outdoor unit of a double-fan air conditioner in a heating mode, the air conditioner, a storage medium and a computer program product. BACKGROUND

[0002] During the heating process of the air conditioner, the outdoor unit absorbs heat from outdoor air, and the temperature of the outdoor heat exchanger is reduced. When the outdoor air meets the outdoor heat exchanger with a lower temperature, water vapor will quickly condense into frost, and the frost layer will cause the refrigerant flow to be blocked, thereby affecting the heating capacity. Since the outdoor fan is on one side of the outdoor heat exchanger, the wind field on both sides of the outdoor heat exchanger is uneven. The side of the outdoor heat exchanger where the outdoor fan is located is the windward side, and the degree of frosting is more serious. The side of the outdoor heat exchanger where the outdoor fan is not located is the leeward side, and the leeward side rarely frosts or even does not frost. Due to repeated frosting and defrosting of the outdoor heat exchanger, the heating time of the air conditioner is short, and the indoor comfort is affected.

[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The present application aims to provide a control method and device of an air conditioner, the air conditioner, a storage medium and a computer program product, to solve the problem of repeated frosting and defrosting of the outdoor heat exchanger during the heating process of the air conditioner, which shortens the heating time of the air conditioner and affects the indoor comfort. Through the control of alternating opening of the double fans of the outdoor unit, the frosting opportunity is determined according to the difference between the outdoor ring temperature and the surface temperature of the outdoor heat exchanger, and the time interval of the alternating opening of the double fans is corrected according to the change of the current of the double fans after determining the frosting opportunity. The starting mode of the double fans is optimized, the heating time is prolonged, frequent frosting or frost not defrosting is avoided, precise frosting is realized, and the indoor comfort is improved.

[0005] The application provides a control method of an air conditioner, an outdoor unit of the air conditioner, and a control method of the air conditioner. The outdoor unit of the air conditioner has an outdoor heat exchanger, an outdoor fan, an outdoor air inlet, and a shielding device. The outdoor fan includes a first fan arranged in a first fan cavity and a second fan arranged in a second fan cavity. The first fan cavity is located at a first surface of the outdoor heat exchanger, and the second fan cavity is located at a second surface of the outdoor heat exchanger. The outdoor air inlet includes a first air inlet and a second air inlet. The shielding device can shield any one of the first air inlet and the second air inlet. The control method of the air conditioner includes the following steps. After the air conditioner starts a heating mode, the first fan is controlled to start, the second fan is controlled to stop, and the shielding device is controlled to shield the second air inlet, so that the first air inlet and the first air inlet cavity form an air path. When the air conditioner operates in the heating mode, the outdoor environment temperature of the air conditioner is obtained, the surface temperature of the first surface of the outdoor heat exchanger is obtained, the surface temperature of the second surface of the outdoor heat exchanger is obtained, the current of the first fan and the operation time of the first fan are obtained, and the current of the second fan and the operation time of the second fan are obtained. The first fan and the second fan are alternately controlled to start in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger, and the surface temperature of the second surface of the outdoor heat exchanger, and the outdoor heat exchanger is controlled to defrost. In the process of controlling the first fan and the second fan to alternately start, and / or after controlling the outdoor heat exchanger to defrost, the time interval of the first fan and the second fan alternately starting is corrected in combination with the current of the first fan and the operation time of the first fan, and the current of the second fan and the operation time of the second fan, and the first fan and the second fan are alternately controlled to start at the corrected time interval.

[0006] In some embodiments, in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger, and the surface temperature of the second surface of the outdoor heat exchanger, the first fan and the second fan are alternately controlled to be turned on, and the outdoor heat exchanger is controlled to defrost, including: in the case that the first fan is turned on, the second fan is turned off, and the shielding device shields the second air inlet, determining whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger is greater than or equal to a first preset temperature; if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger is less than the first preset temperature, the first fan is maintained to be turned on, the second fan is maintained to be turned off, and the shielding device is maintained to shield the second air inlet; if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger is greater than or equal to the first preset temperature, it is determined that the first surface of the outdoor heat exchanger is frosted, the first fan is controlled to be turned off, the second fan is controlled to be turned on, and the shielding device is controlled to shield the first air inlet, so that the second air inlet and the second air inlet cavity form an air path; thus, the first time of alternately turning on the first fan and the second fan is realized.

[0007] In some embodiments, in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger, and the surface temperature of the second surface of the outdoor heat exchanger, the first fan and the second fan are alternately controlled to be turned on, and the outdoor heat exchanger is controlled to defrost, further including: in the case that the first fan is turned off, the second fan is turned on, and the shielding device shields the first air inlet, determining whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger is greater than or equal to a first preset temperature; if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger is less than the first preset temperature, the first fan is maintained to be turned off, the second fan is maintained to be turned on, and the shielding device is maintained to shield the first air inlet; if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger is greater than or equal to the first preset temperature, it is first determined whether the outdoor heat exchanger meets a preset defrosting condition; if it is first determined that the outdoor heat exchanger meets the preset defrosting condition, the air conditioner is controlled to stop running in a heating mode, and the air conditioner is controlled to enter a preset defrosting mode to defrost the outdoor heat exchanger; if it is first determined that the outdoor heat exchanger does not meet the preset defrosting condition, the second fan is controlled to be turned off, the first fan is controlled to be turned on again, and the shielding device is controlled to shield the second air inlet so that the first air inlet and the first air inlet cavity form an air path; thus, the second time of alternately turning on the first fan and the second fan is realized.

[0008] In some embodiments, in combination with the outdoor environment temperature, the surface temperature of the first surface of the outdoor heat exchanger, and the surface temperature of the second surface of the outdoor heat exchanger, the first fan and the second fan are alternately turned on, and the outdoor heat exchanger is defrosted, further comprising: in the case that the second fan is turned off, the first fan is turned on again, and the shielding device shields the second air inlet, in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, the time interval of the first fan and the second fan alternately turning on is corrected, and the minimum running time interval of the first fan after being turned on again is obtained as the corrected time interval of the first fan and the second fan alternately turning on; the first fan is controlled to run for the minimum running time interval of the first fan after being turned on again, and then the second determination of whether the outdoor heat exchanger meets the preset defrosting condition is performed; if the second determination shows that the outdoor heat exchanger meets the preset defrosting condition, the air conditioner is controlled to stop running in the heating mode, and the air conditioner is controlled to enter the preset defrosting mode to defrost the outdoor heat exchanger; if the second determination shows that the outdoor heat exchanger does not meet the preset defrosting condition, the first fan is controlled to be turned off, the second fan is controlled to be turned on again, and the shielding device is controlled to shield the first air inlet so that the second air inlet and the first air inlet cavity form an air path; thus, the third alternately turning on of the first fan and the second fan is realized.

[0009] In some embodiments, the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger, and the surface temperature of the second surface of the outdoor heat exchanger are combined to control the first fan and the second fan to open alternately, and to control the outdoor heat exchanger to defrost, further comprising: in the case that the first fan is closed, the second fan is opened again, and the shielding device shields the first air inlet, combining the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, to correct the time interval of the first fan and the second fan to open alternately, to obtain the minimum running time interval of the second fan after being opened again as the corrected time interval of the first fan and the second fan to open alternately; controlling the second fan to run for the minimum running time interval of the second fan after being opened again, and then determining for the third time whether the outdoor heat exchanger meets the preset defrosting condition; if it is determined for the third time that the outdoor heat exchanger meets the preset defrosting condition, controlling the air conditioner to stop running in the heating mode, and controlling the air conditioner to enter the preset defrosting mode to defrost the outdoor heat exchanger; if it is determined for the third time that the outdoor heat exchanger does not meet the preset defrosting condition, returning to control the first fan to open, control the second fan to close, and control the shielding device to shield the second air inlet, and so on.

[0010] In some embodiments, the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger, and the surface temperature of the second surface of the outdoor heat exchanger are combined to control the first fan and the second fan to open alternately, and to control the outdoor heat exchanger to defrost, further comprising: in the case that the first fan is closed, the second fan is opened again, and the shielding device shields the first air inlet, combining the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, to correct the time interval of the first fan and the second fan to open alternately, to obtain the minimum running time interval of the second fan after being opened again as the corrected time interval of the first fan and the second fan to open alternately; controlling the second fan to run for the minimum running time interval of the second fan after being opened again, and then determining for the third time whether the outdoor heat exchanger meets the preset defrosting condition; if it is determined for the third time that the outdoor heat exchanger meets the preset defrosting condition, controlling the air conditioner to stop running in the heating mode, and controlling the air conditioner to enter the preset defrosting mode to defrost the outdoor heat exchanger; if it is determined for the third time that the outdoor heat exchanger does not meet the preset defrosting condition, returning to control the first fan to open, control the second fan to close, and control the shielding device to shield the second air inlet, and so on.

[0011] And / or, in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, the time interval of the first fan and the second fan alternately opening is corrected, including at least one of the following correction processes: the first correction process: in a cycle period, the current of the first fan when the first side of the outdoor heat exchanger is determined to be frosted is recorded as the first current of the first fan, the running time of the second fan when the outdoor heat exchanger is determined for the first time to not meet the preset defrosting condition is recorded as the opening time of the second fan, the current of the second fan is recorded as the first current of the second fan, and the current of the first fan when the first fan is controlled to open again is recorded as the second current of the first fan; the difference between the first current of the second fan and the second current of the first fan is determined, the ratio of the difference to the difference between the first current of the first fan and the second current of the first fan is determined, and the product value of the ratio and the opening time of the second fan is determined as the minimum running time interval after the first fan is opened again after correction, so as to obtain the time interval of the first fan and the second fan alternately opening after correction.

[0012] The second correction process: in a cycle period, the current of the first fan when the first side of the outdoor heat exchanger is determined to be frosted is recorded as the first current of the first fan, the current of the second fan when the outdoor heat exchanger is determined for the first time to not meet the preset defrosting condition is recorded as the first current of the second fan, the running time of the first fan when the outdoor heat exchanger is determined for the second time to not meet the preset defrosting condition is recorded as the opening time of the first fan, the current of the first fan is recorded as the third current of the first fan, and the current of the second fan when the second fan is controlled to open again is recorded as the second current of the second fan; the difference between the third current of the first fan and the second current of the second fan is determined, the ratio of the difference to the difference between the first current of the second fan and the second current of the second fan is determined, and the product value of the ratio and the opening time of the first fan is determined as the minimum running time interval after the second fan is opened again after correction, so as to obtain the time interval of the first fan and the second fan alternately opening after correction.

[0013] According to the method, the application provides a control device of an air conditioner, an outdoor unit of the air conditioner, and a control device of the air conditioner. The outdoor unit of the air conditioner has an outdoor heat exchanger, an outdoor fan, an outdoor air inlet, and a shielding device. The outdoor fan includes a first fan arranged in a first fan cavity and a second fan arranged in a second fan cavity. The first fan cavity is located on a first surface of the outdoor heat exchanger, and the second fan cavity is located on a second surface of the outdoor heat exchanger. The outdoor air inlet includes a first air inlet and a second air inlet. The shielding device can shield any one of the first air inlet and the second air inlet. The control device of the air conditioner includes a control unit configured to control the first fan to be turned on, control the second fan to be turned off, and control the shielding device to shield the second air inlet after the air conditioner is turned on in a heating mode, so that the first air inlet and the first air cavity form an air path. An acquisition unit is configured to acquire an outdoor environment temperature of the air conditioner, acquire a surface temperature of the first surface of the outdoor heat exchanger, acquire a surface temperature of the second surface of the outdoor heat exchanger, acquire a current of the first fan and an operation time of the first fan, and acquire a current of the second fan and an operation time of the second fan when the air conditioner is running in the heating mode. The control unit is further configured to control the first fan and the second fan to be alternately turned on in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger, and the surface temperature of the second surface of the outdoor heat exchanger, and control the outdoor heat exchanger to defrost. The control unit is further configured to correct a time interval of the first fan and the second fan being alternately turned on in combination with the current of the first fan and the operation time of the first fan and the current of the second fan and the operation time of the second fan during the control of the first fan and the second fan being alternately turned on and / or after the control of the outdoor heat exchanger to defrost, and control the first fan and the second fan to be alternately turned on according to the corrected time interval of the first fan and the second fan being alternately turned on.

[0014] In some embodiments, the control unit, in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger, and the surface temperature of the second surface of the outdoor heat exchanger, controls the first fan and the second fan to alternately open, and controls the outdoor heat exchanger to defrost, including: in the case that the first fan is opened, the second fan is closed, and the shielding device shields the second air inlet, determining whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger is greater than or equal to a first preset temperature; if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger is less than the first preset temperature, maintaining the first fan to be opened, the second fan to be closed, and the shielding device to shield the second air inlet; if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger is greater than or equal to the first preset temperature, determining that the first surface of the outdoor heat exchanger is frosted, controlling the first fan to be closed, controlling the second fan to be opened, and controlling the shielding device to shield the first air inlet, so that the second air inlet and the second air inlet cavity form an air path; thus, the first fan and the second fan are alternately opened for the first time.

[0015] In some embodiments, the control unit, in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger, and the surface temperature of the second surface of the outdoor heat exchanger, controls the first fan and the second fan to alternately open, and controls the outdoor heat exchanger to defrost, further including: in the case that the first fan is closed, the second fan is opened, and the shielding device shields the first air inlet, determining whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger is greater than or equal to a first preset temperature; if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger is less than the first preset temperature, maintaining the first fan to be closed, the second fan to be opened, and the shielding device to shield the first air inlet; if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger is greater than or equal to the first preset temperature, first determining whether the outdoor heat exchanger meets a preset defrosting condition; if it is first determined that the outdoor heat exchanger meets the preset defrosting condition, controlling the air conditioner to stop running in a heating mode, and controlling the air conditioner to enter a preset defrosting mode to defrost the outdoor heat exchanger; if it is first determined that the outdoor heat exchanger does not meet the preset defrosting condition, controlling the second fan to be closed, controlling the first fan to be opened again, and controlling the shielding device to shield the second air inlet so that the first air inlet and the first air inlet cavity form an air path; thus, the first fan and the second fan are alternately opened for the second time.

[0016] In some embodiments, the control unit, in combination with the outdoor ambient temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger, and the surface temperature of the second surface of the outdoor heat exchanger, controls the first fan and the second fan to open alternately, and controls the outdoor heat exchanger to defrost, further comprising: in the case that the second fan is closed, the first fan is opened again, and the shielding device shields the second air inlet, in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, the time interval of the first fan and the second fan opening alternately is corrected, and the minimum running time interval after the first fan is opened again is obtained as the corrected time interval of the first fan and the second fan opening alternately; the first fan is controlled to run for the minimum running time interval after the first fan is opened again, and then the second determination is made on whether the outdoor heat exchanger meets the preset defrosting condition; if the second determination is that the outdoor heat exchanger meets the preset defrosting condition, the air conditioner is controlled to stop running in the heating mode, and the air conditioner is controlled to enter the preset defrosting mode to defrost the outdoor heat exchanger; if the second determination is that the outdoor heat exchanger does not meet the preset defrosting condition, the first fan is controlled to be closed, the second fan is controlled to be opened again, and the shielding device is controlled to shield the first air inlet so that the second air inlet and the first air inlet cavity form an air path; thus, the third alternation of the first fan and the second fan is realized.

[0017] In some embodiments, the control unit controls the outdoor heat exchanger to defrost, including: in the case where it is necessary to determine whether the outdoor heat exchanger meets the preset defrosting condition, determining whether the difference between the outdoor ambient temperature of the air conditioner and the surface temperature of the current windward surface of the outdoor heat exchanger is greater than or equal to a first preset temperature, and whether the difference between the outdoor ambient temperature of the air conditioner and the surface temperature of the current leeward surface of the outdoor heat exchanger is greater than or equal to the first preset temperature; wherein the current windward surface of the outdoor heat exchanger is one of the first surface and the second surface of the outdoor heat exchanger; the current leeward surface of the outdoor heat exchanger is the other of the first surface and the second surface of the outdoor heat exchanger; if it is determined that the condition is met, it is determined that the outdoor heat exchanger meets the preset defrosting condition, so as to control the air conditioner to stop running in the heating mode and control the air conditioner to enter the preset defrosting mode to defrost the outdoor heat exchanger; after controlling the air conditioner to enter the preset defrosting mode, determining whether the surface temperature of the current windward surface of the outdoor heat exchanger is greater than or equal to a second preset temperature, and whether the surface temperature of the current leeward surface of the outdoor heat exchanger is greater than or equal to the second preset temperature; wherein the second preset temperature is greater than the first preset temperature; if it is determined that the condition is met, the air conditioner is controlled to exit the preset defrosting mode, any one of the first fan and the second fan is turned on, and the heating mode of the air conditioner is re-entered.

[0018] In some embodiments, the control unit controls the outdoor heat exchanger to defrost, including: in the case where it is necessary to determine whether the outdoor heat exchanger meets the preset defrosting condition, determining whether the difference between the outdoor ambient temperature of the air conditioner and the surface temperature of the current windward surface of the outdoor heat exchanger is greater than or equal to a first preset temperature, and whether the difference between the outdoor ambient temperature of the air conditioner and the surface temperature of the current leeward surface of the outdoor heat exchanger is greater than or equal to the first preset temperature; wherein the current windward surface of the outdoor heat exchanger is one of the first surface and the second surface of the outdoor heat exchanger; the current leeward surface of the outdoor heat exchanger is the other of the first surface and the second surface of the outdoor heat exchanger; if it is determined that the condition is met, it is determined that the outdoor heat exchanger meets the preset defrosting condition, so as to control the air conditioner to stop running in the heating mode and control the air conditioner to enter the preset defrosting mode to defrost the outdoor heat exchanger; after controlling the air conditioner to enter the preset defrosting mode, determining whether the surface temperature of the current windward surface of the outdoor heat exchanger is greater than or equal to a second preset temperature, and whether the surface temperature of the current leeward surface of the outdoor heat exchanger is greater than or equal to the second preset temperature; wherein the second preset temperature is greater than the first preset temperature; if it is determined that the condition is met, the air conditioner is controlled to exit the preset defrosting mode, any one of the first fan and the second fan is turned on, and the heating mode of the air conditioner is re-entered.

[0019] And / or, the control unit, in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, corrects the time interval of the first fan and the second fan alternately opening, including at least one of the following correction processes: the first correction process: in a cycle period, the current of the first fan when the first surface of the outdoor heat exchanger is determined to be frosting is recorded as the first current of the first fan, the running time of the second fan when the outdoor heat exchanger is determined for the first time to not meet the preset defrosting condition is recorded as the opening time of the second fan, the current of the second fan is recorded as the first current of the second fan, and the current of the first fan when the first fan is controlled to open again is recorded as the second current of the first fan; determine the difference between the first current of the second fan and the second current of the first fan, determine the ratio of the difference to the difference between the first current of the first fan and the second current of the first fan, and determine the product value of the ratio and the opening time of the second fan as the minimum running time interval after the first fan is opened again after correction, to obtain the corrected time interval of the first fan and the second fan alternately opening.

[0020] The second correction process: in a cycle period, the current of the first fan when the first surface of the outdoor heat exchanger is determined to be frosting is recorded as the first current of the first fan, the current of the second fan when the outdoor heat exchanger is determined for the first time to not meet the preset defrosting condition is recorded as the first current of the second fan, the running time of the first fan when the outdoor heat exchanger is determined for the second time to not meet the preset defrosting condition is recorded as the opening time of the first fan, the current of the first fan is recorded as the third current of the first fan, and the current of the second fan when the second fan is controlled to open again is recorded as the second current of the second fan; determine the difference between the third current of the first fan and the second current of the second fan, determine the ratio of the difference to the difference between the first current of the second fan and the second current of the second fan, and determine the product value of the ratio and the opening time of the first fan as the minimum running time interval after the second fan is opened again after correction, to obtain the corrected time interval of the first fan and the second fan alternately opening.

[0021] To match the above device, the present application further provides an air conditioner, comprising: the control device of the air conditioner described above.

[0022] To match the above method, the present application further provides a storage medium, which comprises a stored program, wherein when the program runs, the device where the storage medium is located executes the steps of the control method of the air conditioner described above.

[0023] According to the method, the computer program product comprises a computer program which, when executed by a processor, implements the steps of the control method of the air conditioner.

[0024] According to the scheme, the outdoor fan of the air conditioner outdoor unit includes a first fan in a first fan cavity and a second fan in a second fan cavity, which are correspondingly distributed on both sides of the outdoor heat exchanger, and a first air inlet and a second air inlet are correspondingly arranged at the first fan and the second fan, any one of the first air inlet and the second air inlet can be blocked by a baffle device to adjust the air path; when the air conditioner is in heating operation, the first fan is first opened and the second fan is closed, the second air inlet is blocked to form an air path of the first air inlet and the first fan cavity; when the difference between the outdoor ring temperature and the temperature of the first windward surface is greater than a first preset temperature, it is determined that the first windward surface is frosted, the current of the first fan is recorded and recorded as the first current of the first fan, the first fan is closed and the second fan is opened, the first air inlet is blocked to form an air path of the second air inlet and the second fan cavity; when the difference between the outdoor ring temperature and the temperature of the second windward surface is greater than the first preset temperature, it is determined that the second windward surface is frosted, whether the outdoor heat exchanger meets the defrosting condition is determined: when the outdoor heat exchanger meets the defrosting condition, the heating is stopped to enter the defrosting, when the outdoor heat exchanger does not meet the defrosting condition, the opening time of the second fan is recorded, the current of the second fan is recorded and recorded as the first current of the second fan, the second fan is closed and the first fan is opened again, the second air inlet is blocked again to form an air path of the first air inlet and the first fan cavity, the current of the first fan when the first fan is opened again is recorded and recorded as the second current of the first fan; according to the first current of the first fan, the second current of the first fan, the first current of the second fan and the opening time of the second fan, the minimum time interval of the first fan after the first fan is opened again and runs to the need of replacing the fan is predicted and recorded as the minimum replacement time interval of the first fan; after the first fan is opened again and runs for the minimum replacement time interval of the first fan, whether the outdoor heat exchanger meets the defrosting condition is determined for the second time: when the outdoor heat exchanger meets the defrosting condition for the second time, the heating is stopped to enter the defrosting, when the outdoor heat exchanger does not meet the defrosting condition for the second time, the opening time of the first fan is recorded, the current of the first fan when the first fan does not meet the defrosting condition after being opened again is recorded and recorded as the third current of the first fan, the first fan opened again is closed and the second fan is opened again, the current of the second fan opened again is recorded and recorded as the second current of the second fan, according to the first current of the second fan, the second current of the second fan, the third current of the first fan and the opening time of the first fan, the minimum time interval of the second fan after the second fan is opened again and runs to the need of replacing the fan is predicted and recorded as the minimum replacement time interval of the second fan; after the second fan is opened again and runs for the minimum replacement time interval of the second fan, whether the outdoor heat exchanger meets the defrosting condition is determined for the third time: when the outdoor heat exchanger meets the defrosting condition for the third time, the heating is stopped to enter the defrosting, when the outdoor heat exchanger does not meet the defrosting condition for the third time, the first fan is opened again and the second fan is closed, and the cycle control of the alternating opening of the first fan and the second fan is performed.Therefore, by judging the defrosting mode opening according to the difference between the outdoor ring temperature and the surface temperature of the outdoor heat exchanger in the cycle control of the alternating opening of the double fans of the outdoor unit, and correcting the time interval of the alternating opening of the double fans according to the change of the double fan current after judging the defrosting opportunity, the starting mode of the double fans can be optimized, the heating time is as long as possible, frequent defrosting or frost is avoided, precise defrosting is realized, and indoor comfort is improved.

[0025] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application.

[0026] The technical solutions of the present application will be further described in detail below with the help of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Flowchart of an embodiment of the control method of the air conditioner of the present application;

[0028] Figure 2 Flowchart of an embodiment of the first process of controlling the alternating opening of the first fan and the second fan and the defrosting of the outdoor heat exchanger 2 in the method of the present application;

[0029] Figure 3 Flowchart of an embodiment of the second process of controlling the alternating opening of the first fan and the second fan and the defrosting of the outdoor heat exchanger 2 in the method of the present application;

[0030] Figure 4 Flowchart of an embodiment of the third process of controlling the alternating opening of the first fan and the second fan and the defrosting of the outdoor heat exchanger 2 in the method of the present application;

[0031] Figure 5 Flowchart of an embodiment of the fourth process of controlling the alternating opening of the first fan and the second fan and the defrosting of the outdoor heat exchanger 2 in the method of the present application;

[0032] Figure 6 Flowchart of an embodiment of the process of controlling the defrosting of the outdoor heat exchanger 2 in the method of the present application;

[0033] Figure 7 Flowchart of an embodiment of the first correction process of correcting the time interval of the alternating opening of the first fan and the second fan in the method of the present application;

[0034] Figure 8 Flowchart of an embodiment of the second correction process of correcting the time interval of the alternating opening of the first fan and the second fan in the method of the present application;

[0035] Figure 9 This is a schematic diagram of the structure of an embodiment of the air conditioner control device of the present invention;

[0036] Figure 10 This is a structural diagram of the outdoor unit of an air conditioner;

[0037] Figure 11 This is a schematic diagram of the outdoor unit when it is in state 1.

[0038] Figure 12 This is a schematic diagram of the outdoor unit in state 2.

[0039] Figure 13 A schematic diagram of the control logic for starting and stopping the defrosting process of an air conditioner;

[0040] Figure 14 This is a schematic diagram of the control logic for the alternating operation of the first and second fans in the outdoor unit of an air conditioner.

[0041] Referring to the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0042] 1-First fan chamber; 2-Outdoor heat exchanger; 3-Second fan chamber; 4-Motor; 5-Gear; 6-Rack; 7-Opening; 8-Baffle; 9-First air inlet; 10-Second air inlet; 11-First windward surface; 12-Second windward surface; 102-Acquisition unit; 104-Control unit. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0044] Considering that repeated frosting and defrosting of the outdoor heat exchanger during air conditioning heating results in a short heating time and affects indoor comfort, in order to extend the heating time of the air conditioner and avoid repeated frosting and defrosting of the outdoor heat exchanger, such as... Figure 10 The present invention proposes an outdoor unit with dual fan cavities. The outdoor heat exchanger 2 is divided into a first fan cavity 1 and a second fan cavity 2. The first fan and the second fan are located in the two fan cavities respectively. During heating, the two fans start alternately, and the two sides of the outdoor heat exchanger 2 alternately become the leeward side, thereby reducing defrosting on the leeward side. However, the time interval between the alternating start of the two fans and the start time of defrosting are difficult to control, resulting in frequent defrosting or frost that does not defrost, which affects the heating effect.

[0045] Some schemes, for the outdoor unit structure of the upper and lower double fan, control the fan speed by monitoring the difference between the upper temperature and the lower temperature of the outdoor heat exchanger and the dew point temperature, so that the outdoor heat exchanger frost is more uniform, solve the problem of uneven frost, but do not relieve frost alternately by controlling the double fan, prolong the heating time.

[0046] Some other schemes, according to the actual defrosting interval and the actual defrosting time within the preset time, determine the minimum defrosting interval of the next time, and according to the minimum defrosting time of the next time, control the defrosting time of the next time. But this patent only judges the minimum time interval of two defrostings according to the defrosting time, only judges according to the time change rule, and does not consider the actual frost situation, which may lead to inaccurate judgment.

[0047] Therefore, the scheme of the present application proposes a control method of air conditioner, specifically a control method of double fan operation and defrosting of double fan outdoor unit in heating mode, which judges the opening of defrosting mode according to the difference between the ambient temperature and the surface temperature of the outdoor heat exchanger, to avoid the problem of frost not being defrosted on the outdoor unit; and corrects the time interval of the alternate opening of the double fan according to the change of the double fan current after judging the defrosting opportunity, which can better control the operation of the double fan and the opening of the defrosting mode, optimize the starting mode of the double fan, prolong the heating time as much as possible, and avoid frequent defrosting; so as to realize accurate defrosting, improve the heating effect and improve the indoor comfort.

[0048] According to the embodiment of the present application, a control method of air conditioner is provided, as shown in Figure 1 The flowchart of an embodiment of the method of the present application. The outdoor unit of the air conditioner has an outdoor heat exchanger 2, an outdoor fan, an outdoor air inlet and a shielding device; the outdoor fan includes a first fan arranged in a first fan cavity 1 and a second fan arranged in a second fan cavity 3, the first fan cavity 1 is located on the first face of the outdoor heat exchanger 2, and the second fan cavity 3 is located on the second face of the outdoor heat exchanger 2; the outdoor air inlet includes a first air inlet 9 and a second air inlet 10, and the shielding device can shield any one of the first air inlet 9 and the second air inlet 10; wherein the first face of the outdoor heat exchanger 2 and the second face of the outdoor heat exchanger 2 are two opposite faces, one of which is a windward face and the other of which is a leeward face. The scheme of the present application is for a double fan outdoor unit structure, specifically, Figure 10 The structural diagram of the outdoor unit of the air conditioner. As shown in Figure 10 The double fan outdoor unit structure includes an outdoor heat exchanger 2, a first fan cavity 1, a second fan cavity 3, an opening 7 on the side plate of the outdoor unit shell for ventilation, a motor 4 arranged above the side plate of the outdoor unit shell for driving the gear 5 to rotate, and a baffle 8 arranged on the side plate of the outdoor unit shell, the baffle 8 has a rack 6 above it, and the rack 6 is engaged with the gear 5.

[0049] Figure 11 It is a structure schematic diagram when the outdoor unit is in state 1. As shown in the figure, the first fan is arranged in the first fan cavity 1. When heating, the motor 4 rotates to make the baffle 8 block the second air inlet 10, the first air inlet 9 and the first fan cavity 1 form a wind path, one side of the outdoor heat exchanger 2 of the first fan cavity 1 is a first windward surface 11, and one side of the outdoor heat exchanger 2 of the second fan cavity 3 is a leeward surface. Figure 11

[0050] It is a structure schematic diagram when the outdoor unit is in state 2. As shown in the figure, the second fan is arranged in the second fan cavity 3. When the fan is replaced and operated, the motor 4 rotates to make the baffle 8 block the first air inlet 9, the second air inlet 10 and the second fan cavity 3 form a wind path, one side of the outdoor heat exchanger 2 of the second fan cavity 3 is a second windward surface 12, and one side of the outdoor heat exchanger 2 of the first fan cavity 1 is a leeward surface. Figure 12 Figure 12 In the scheme of the application, a double-fan structure is adopted. In the process of alternating operation of the double fans, the two sides of the evaporator (i.e. the outdoor heat exchanger 2) alternately become windward surfaces and leeward surfaces. Since the windward surface of the evaporator is more prone to frosting, the degree of frosting can be alleviated to a certain extent in the process of making one side of the windward surface become a leeward surface. In this way, the heating time can be prolonged, and the air conditioner does not need to be frequently stopped for defrosting.

[0051] In the scheme of the application, as shown in the figure, the control method of the air conditioner comprises steps S110 to S130.

[0052] At step S110, after the air conditioner starts the heating mode, the first fan is controlled to be turned on, the second fan is controlled to be turned off, and the blocking device is controlled to block the second air inlet 10, so that the first air inlet 9 and the first air inlet cavity 1 form a wind path. Wherein, the first fan and the second fan are relative. When one fan of the double fans of the outdoor unit is the first fan, the other fan is the second fan. Here, it is assumed that the first fan is turned on, the second fan is turned off, and the second air inlet 10 is blocked after the air conditioner starts the heating mode. Of course, the second fan can also be turned on, the first fan can be turned off, and the first air inlet 9 can be blocked. Figure 1 At step S120, in the case that the air conditioner operates in the heating mode, the outdoor environment temperature of the air conditioner is acquired, the surface temperature of the first side of the outdoor heat exchanger 2 is acquired, the surface temperature of the second side of the outdoor heat exchanger 2 is acquired, the current of the first fan and the operating time of the first fan are acquired, and the current of the second fan and the operating time of the second fan are acquired.

[0053]

[0054]

[0055] ​​​At step S130, the first fan and the second fan are alternately controlled to be turned on in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger 2, and the surface temperature of the second surface of the outdoor heat exchanger 2, and the outdoor heat exchanger 2 is defrosted.

[0056] In step S130, during the process of alternately controlling the first fan and the second fan to be turned on, and / or after the outdoor heat exchanger 2 is defrosted, the time interval of alternately turning on the first fan and the second fan is corrected in combination with the current of the first fan, the running time of the first fan, the current of the second fan, and the running time of the second fan, and the first fan and the second fan are alternately controlled to be turned on according to the corrected time interval, so as to better control the operation of the double fans and the opening of the defrosting mode. Wherein, the correction of the time interval of alternately turning on the first fan and the second fan specifically includes: correcting the minimum running time interval after the first fan is turned on again in combination with the current of the first fan, the current of the second fan, and the running time of the second fan; and correcting the minimum running time interval after the second fan is turned on again in combination with the current of the first fan, the current of the second fan, and the running time of the first fan, to obtain the minimum running time interval after the second fan is turned on again.

[0057] The scheme of the present application provides a control scheme of an outdoor unit with a double-fan structure, so as to solve the problems that the time interval of alternately turning on the double fans is difficult to determine, the frequency of replacing the fan is difficult to control within a proper range, and the defrosting time point is not clear. According to the scheme of the present application, the opening of the defrosting mode can be determined according to the difference between the environment temperature and the surface temperature of the outdoor heat exchanger, so as to avoid the problem that the frost on the outdoor unit is not defrosted; and the time interval of alternately turning on the double fans is corrected according to the current change of the double fans after the defrosting time is determined, so as to better control the operation of the double fans and the opening of the defrosting mode, optimize the starting mode of the double fans, prolong the heating time as much as possible, and avoid frequent defrosting; thereby realizing precise defrosting, improving the heating effect, and improving the indoor comfort.

[0058] In some embodiments, the step S130 of alternately controlling the first fan and the second fan to be turned on in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger 2, and the surface temperature of the second surface of the outdoor heat exchanger 2, and defrosting the outdoor heat exchanger 2 includes: controlling a first process of alternately turning on the first fan and the second fan and defrosting the outdoor heat exchanger 2.

[0059] The following will be described in combination with Figure 2An embodiment flowchart of the first process of controlling the first fan and the second fan to alternately open and defrosting the outdoor heat exchanger 2 in the method of the application is shown, which further illustrates the specific process of controlling the first process of controlling the first fan and the second fan to alternately open and defrosting the outdoor heat exchanger 2 in step S130, comprising steps S210 to S230.

[0060] Step S210, in the case that the first fan is opened, the second fan is closed, and the blocking device blocks the second air inlet 10, it is determined whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first face of the outdoor heat exchanger 2 is greater than or equal to the first preset temperature.

[0061] Step S220, if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first face of the outdoor heat exchanger 2 is less than the first preset temperature, the first fan is maintained to be opened, the second fan is maintained to be closed, and the blocking device blocks the second air inlet 10.

[0062] Step S230, if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first face of the outdoor heat exchanger 2 is greater than or equal to the first preset temperature, it is determined that the first face of the outdoor heat exchanger 2 is frosted, the current of the first fan at this time is recorded as the first current of the first fan, the first fan is controlled to be closed, the second fan is controlled to be opened, and the blocking device is controlled to block the first air inlet 9, so that the second air inlet 10 and the second air inlet cavity 3 form an air path; at this time, the first fan and the second fan are alternately opened for the first time, and then the outdoor heat exchanger 2 is defrosted for the first time.

[0063] Specifically, Figure 14 The control logic diagram of the first fan and the second fan alternately running in the outdoor unit of the air conditioner is shown. As Figure 14 The control logic of the first fan and the second fan alternately running in the outdoor unit of the air conditioner, comprising:

[0064] Step 11, the air conditioner is in heating operation, and then step 12 is performed.

[0065] Step 12, when the air conditioner is in heating operation, the first fan is opened, the second fan is closed, the motor 4 controls the gear 5 to rotate, and the baffle 8 blocks the second air inlet 10, and then step 13 is performed.

[0066] In step 12, the first fan is opened, the second fan is closed, the motor 4 controls the gear 5 to rotate, and the baffle 8 blocks the second air inlet 10, the first air inlet 9 and the first fan cavity 1 form an air path, and the air can enter the first fan cavity 1 from the second fan cavity 3 and the first air inlet 9 at the same time, thereby increasing the air inlet area.

[0067] Step 13, judge whether the difference between the outer ring temperature Tw and the temperature Ty1 of the first windward surface 11 is greater than the first preset temperature: if yes, judge that the first windward surface 11 is frosted, and execute step 14; if not, judge that the first windward surface 11 is not frosted, and return to step 12 to continue the heating operation.

[0068] For example, the temperature of the first windward surface 11 is -5℃, the outer ring temperature is 2℃, and the first preset temperature is 6℃, so the difference between the outer ring temperature Tw and the temperature Ty1 of the first windward surface 11 is 7℃, which is higher than the first preset temperature, indicating that the first windward surface 11 is frosted, and the second fan needs to be started to replace the windward surface. By changing the air path, the initial windward surface of the evaporator (i.e. the outdoor heat exchanger 2) becomes the leeward surface, which can delay the frosting of the leeward surface, even the leeward surface does not frost, so that the air conditioner does not need to defrost frequently, and the heating time is increased.

[0069] Step 14, in the case of judging that the first windward surface 11 is frosted, record the current of the first fan I 11 , turn off the first fan, start the second fan, and control the gear 5 to rotate by the motor 4 to block the first air inlet 9 by the baffle 8, and then execute step 15.

[0070] In step 14, the first fan is turned off, the second fan is started, the gear 5 is controlled to rotate by the motor 4 to block the first air inlet 9 by the baffle 8, and the second air inlet 10 forms an air path with the second fan cavity 3, so that the air can enter the second fan cavity 3 from the second fan cavity 3 and the second air inlet 10 at the same time, thereby increasing the air inlet area.

[0071] In the scheme of the present application, by combining the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger 2, and the surface temperature of the second surface of the outdoor heat exchanger 2, the first fan and the second fan are alternately started, and the outdoor heat exchanger 2 is defrosted, so as to avoid frost on the outdoor unit and avoid frequent defrosting, realize precise defrosting, improve the heating effect, and improve the indoor comfort.

[0072] In some embodiments, in step S130, the first fan and the second fan are alternately started, and the outdoor heat exchanger 2 is defrosted by combining the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger 2, and the surface temperature of the second surface of the outdoor heat exchanger 2, and further comprising: a second process of alternately starting the first fan and the second fan and defrosting the outdoor heat exchanger 2, i.e. a specific process of defrosting the outdoor heat exchanger 2 for the first time.

[0073] The following will be described in combination with Figure 3An embodiment flowchart of a second process of controlling the first fan and the second fan to alternately open and defrosting the outdoor heat exchanger 2 in the method of the present application is shown, which further illustrates the specific process of controlling the first fan and the second fan to alternately open and defrosting the outdoor heat exchanger 2 in step S130, comprising steps S310 to S350.

[0074] In step S310, when the first fan is closed, the second fan is opened, and the blocking device blocks the first air inlet 9, i.e. when defrosting the outdoor heat exchanger 2 for the first time after the first and second fans are alternately opened for the first time, it is determined whether the difference between the outdoor ambient temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger 2 is greater than or equal to a first preset temperature.

[0075] In step S320, if it is determined that the difference between the outdoor ambient temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger 2 is less than the first preset temperature, the first fan is maintained closed, the second fan is opened, and the blocking device blocks the first air inlet 9.

[0076] In step S330, if it is determined that the difference between the outdoor ambient temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger 2 is greater than or equal to the first preset temperature, the outdoor heat exchanger 2 is determined for the first time whether it meets the preset defrosting condition according to the outdoor ambient temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger 2, and the surface temperature of the second surface of the outdoor heat exchanger 2.

[0077] In step S340, if it is determined for the first time that the outdoor heat exchanger 2 meets the preset defrosting condition, the air conditioner is controlled to stop running in the heating mode, and the air conditioner is controlled to enter the preset defrosting mode to defrost the outdoor heat exchanger 2.

[0078] Step S350: If it is determined for the first time that the outdoor heat exchanger 2 does not meet the preset defrosting conditions, then the running time of the second fan at this time is recorded as the opening time of the second fan, the current of the second fan at this time is recorded as the first current of the second fan, the second fan is controlled to be turned off, the first fan is controlled to be turned on again, the current of the first fan at this time is recorded as the second current of the first fan, and the shielding device is controlled to shield the second air inlet 10 so that the first air inlet 9 and the first air inlet cavity 1 form an air path; thus, the second alternating opening of the first fan and the second fan is realized. After that, the time interval between the alternating opening of the first fan and the second fan is corrected by combining the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan. Specifically, the minimum running time interval after the first fan is turned on again is corrected, and the first fan and the second fan are controlled to alternately open according to the corrected time interval between the alternating opening of the first fan and the second fan, so as to better control the operation of the dual fans and the opening of the defrosting mode.

[0079] Specifically, such as Figure 14 As shown, the control logic for the alternating operation of the first and second fans in the outdoor unit of the air conditioner also includes:

[0080] Step 15: Determine whether the difference between the outer ring temperature Tw and the temperature Ty2 of the second windward surface 12 is greater than the first preset temperature. If yes, determine that the second windward surface 12 is frosted, and then proceed to step 16. Otherwise, determine that the second windward surface 12 is not frosted, and return to step 14 to continue running.

[0081] Step 16: Determine if the defrosting conditions are met: If the defrosting conditions are met, the air conditioner stops heating and enters the defrosting process; if not, record the total operating time of the second fan as t2, and then proceed to step 17.

[0082] Step 17: Record the current of the second fan as I at this time. 21 Turn off the second fan and turn on the first fan. The motor 4 controls the gear 5 to rotate, causing the baffle 8 to block the second air inlet 10. Record the current I when the first fan is turned on again. 12 Then, step 18 is executed to predict the minimum time interval t between the first wind turbine restarting and the need to replace it. gm1 .

[0083] In step 17, record the current I when the first fan restarts. 12 Since the evaporator on the side with the first fan was previously on the leeward side, it was also possible for frost to form (but the degree of frost was lower than on the windward side). Recording the current when it becomes the windward side is equivalent to recording the initial current of the first fan on the current windward side, so as to use the current I when the first fan is turned on again.12 to judge the initial frosting condition of the current windward side.

[0084] In the scheme of the present application, by monitoring the temperature of the two sides of the outdoor heat exchanger of the double-fan air conditioner outdoor unit, the difference between the ambient temperature and the surface temperature of the two sides is calculated to determine whether the defrosting condition is met, and the outdoor unit is controlled to enter the defrosting mode; by monitoring the temperature point reached by the outdoor heat exchanger and the residence time at the temperature point, it is determined whether the defrosting mode is ended. In this way, by monitoring the difference between the temperature of the windward and leeward surfaces of the outdoor heat exchanger and the ambient temperature, it is determined whether the outdoor unit enters the defrosting mode, avoiding the problem of frost not being defrosted on the outdoor unit.

[0085] In some embodiments, the time interval of the first fan and the second fan alternately opening is corrected in step S130 in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, specifically including: combining the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, correcting the time interval of the first fan and the second fan alternately opening, obtaining the minimum running time interval after the first fan is opened again as the corrected time interval of the first fan and the second fan alternately opening.

[0086] In step S130, the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger 2, and the surface temperature of the second surface of the outdoor heat exchanger 2 are combined to control the first fan and the second fan to alternately open, and to control the outdoor heat exchanger 2 to defrost, further including: a third process of controlling the first fan and the second fan to alternately open and the outdoor heat exchanger 2 to defrost, which is a specific process of correcting the minimum running time interval after the first fan is opened again.

[0087] The following will be described in combination with Figure 4 The third process of controlling the first fan and the second fan to alternately open and the outdoor heat exchanger 2 to defrost in the method of the present application is further illustrated in combination with the embodiment flowchart of the third process of controlling the first fan and the second fan to alternately open and the outdoor heat exchanger 2 to defrost in the method of the present application, and the specific process of the third process of controlling the first fan and the second fan to alternately open and the outdoor heat exchanger 2 to defrost in step S130, including: step S410 to step S440.

[0088] Step S410, in the case that the second fan is closed, the first fan is opened again, and the shielding device shields the second air inlet 10, the time interval of the first fan and the second fan alternately opening is corrected in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, and the minimum running time interval of the first fan after being opened again is obtained as the corrected time interval of the first fan and the second fan alternately opening; specifically, the minimum running time interval of the first fan after being opened again is corrected in combination with the current of the first fan, the current of the second fan and the running time of the second fan, and the minimum running time interval of the first fan after being opened again is obtained.

[0089] Step S420, the first fan is controlled to run for the minimum running time interval of the first fan after being opened again after being opened again, and then it is secondly determined whether the outdoor heat exchanger 2 meets the preset defrosting condition.

[0090] Step S430, if it is secondly determined that the outdoor heat exchanger 2 meets the preset defrosting condition, the air conditioner is controlled to stop running in the heating mode and enter the preset defrosting mode to defrost the outdoor heat exchanger 2.

[0091] Step S440, if it is secondly determined that the outdoor heat exchanger 2 does not meet the preset defrosting condition, the running time of the first fan at this time is recorded as the opening time of the first fan, the current of the first fan at this time is recorded as the third current of the first fan, the first fan is controlled to be closed, the second fan is controlled to be opened again, the current of the second fan at this time is recorded as the second current of the second fan, and the shielding device is controlled to shield the first air inlet 9 so that the second air inlet 10 and the first air inlet cavity 3 form an air path; thus, the third time of the first fan and the second fan alternately opening is realized, and then the time interval of the first fan and the second fan alternately opening is corrected in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, specifically, the minimum running time interval of the second fan after being opened again is corrected, and the first fan and the second fan are controlled to alternately open according to the corrected time interval of the first fan and the second fan alternately opening, so as to better control the running of the double fans and the opening of the defrosting mode.

[0092] Specifically, as shown in Figure 14 the control logic of the first fan and the second fan alternately running in the outdoor unit of the air conditioner further comprises:

[0093] Step 18, predicting the minimum time interval t of running after the first fan is started again until the fan needs to be replaced gm1 , and then step 19 is performed.

[0094] In step 18, during the running after the first fan is started again, the frosting degree of the first windward surface 11 is mitigated, and the defrosting rate of the first windward surface 11 is characterized by the current I 11 -I 12 ) / t1. Wherein I 11 is the current of the first fan when judging that the first windward surface 11 is frosted under the condition that the first fan is started and the second fan is stopped. t2 is the total running time of the second fan when judging that the second windward surface 12 is frosted but does not meet the defrosting condition after switching to the first fan being stopped and the second fan being started after judging that the first windward surface 11 is frosted under the condition that the first fan is started and the second fan is stopped. 12 is the current of the first fan when the second fan is stopped and the first fan is started again after judging that the second windward surface 12 is frosted but does not meet the defrosting condition after switching to the first fan being stopped and the second fan being started after judging that the first windward surface 11 is frosted under the condition that the first fan is started and the second fan is stopped.

[0095] According to the current of the previous two times of replacing the fan and the starting time t2 of the second fan, the minimum time interval t gm1 of running after the first fan is started again until the fan needs to be replaced is predicted. The running time of replacing the fan this time is predicted through the change of the actual current and the time of the last time the fan is started.

[0096] Step 19, after the first fan is started again and runs for the minimum time interval t gm1 of replacing the fan, it is judged whether the temperature of the outdoor heat exchanger 2 meets the defrosting condition: if yes, the air conditioner is controlled to stop heating and start defrosting, and then step 20 is performed; otherwise, step 20 is directly performed to predict the minimum time interval t gm2 of running after the second fan is started again until the fan needs to be replaced.

[0097] In the scheme of the application, a control scheme for the heating mode double-fan operation and defrosting of the outdoor unit of the double-fan air conditioner is proposed. The current change of the current starting fan is calculated by monitoring the current change of the fan just started and the current starting fan when the current windward surface is frosted, and then the minimum time interval of the next time replacing the fan is predicted according to the current of the other side fan starting and the stop current of the last fan. In this way, by monitoring the current change and running time of one side fan of the outdoor unit of the double-fan structure during the heating process and the starting current of the other side fan, the minimum time interval of replacing the fan is judged, the starting mode of the double-fan is optimized, the heating time is as long as possible, and frequent defrosting is avoided.

[0098] In some embodiments, the step S130 of combining the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, and correcting the time interval of the first fan and the second fan alternately starting, specifically further comprises: combining the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, and correcting the time interval of the first fan and the second fan alternately starting, to obtain the minimum running time interval of the second fan after starting again as the corrected time interval of the first fan and the second fan alternately starting.

[0099] The step S130 of combining the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger 2, and the surface temperature of the second surface of the outdoor heat exchanger 2, and controlling the first fan and the second fan alternately starting, and controlling the outdoor heat exchanger 2 defrosting, further comprises: a fourth process of controlling the first fan and the second fan alternately starting and the outdoor heat exchanger 2 defrosting, that is, a specific process of correcting the minimum running time interval of the second fan after starting again.

[0100] The following will be described in combination with Figure 5 The fourth process of controlling the first fan and the second fan alternately starting and the outdoor heat exchanger 2 defrosting in the method of the air conditioner shown in FIG. 13 further comprises: a specific process of controlling the first fan and the second fan alternately starting and the outdoor heat exchanger 2 defrosting, that is, a specific process of correcting the minimum running time interval of the second fan after starting again.

[0101] The step S510 of combining the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, and correcting the time interval of the first fan and the second fan alternately starting, and obtaining the minimum running time interval of the second fan after starting again as the corrected time interval of the first fan and the second fan alternately starting, specifically is: combining the current of the first fan, the current of the second fan and the running time of the first fan, and correcting the minimum running time interval of the second fan after starting again, to obtain the minimum running time interval of the second fan after starting again.

[0102] The step S520 of controlling the second fan to start again according to the corrected minimum running time interval of the second fan after starting again, and then thirdly determining whether the outdoor heat exchanger 2 meets the preset defrosting condition.

[0103] Step S530: If it is determined for the third time that the outdoor heat exchanger 2 meets the preset defrosting conditions, then control the air conditioner to stop operating the heating mode and control the air conditioner to enter the preset defrosting mode to defrost the outdoor heat exchanger 2.

[0104] Step S540: If it is determined for the third time that the outdoor heat exchanger 2 does not meet the preset defrosting conditions, then one cycle of control is completed. Then return to control the first fan to start again, control the second fan to stop, and control the shielding device to block the second air inlet 10 to enter the next cycle of control, and so on.

[0105] Specifically, such as Figure 14 As shown, the control logic for the alternating operation of the first and second fans in the outdoor unit of the air conditioner also includes:

[0106] Step 20: Predict the minimum time interval t between the second fan restarting and the fan needing replacement. gm2 Then proceed to step 21.

[0107] In step 20, the minimum time interval t required to replace the fan after the first fan is restarted is determined. gm1 Then, if it is determined that the temperature of outdoor heat exchanger 2 does not meet the defrosting conditions, the start time t1 of the first fan is recorded. The start time t1 of the first fan is the time when the first fan is turned on again. The current I of the first fan at this time is also recorded. 31 Turn off the first fan, turn on the second fan, and record the current of the second fan as I. 22 During the operation of the second fan after it was restarted, the degree of frost formation on the second windward surface 12 was alleviated. The defrosting rate of the second windward surface 12, characterized by current, was (I 21 -I 22 ) / t1. Where, I 21 To determine if the first windward surface 11 is frosted when the first fan is on and the second fan is off, and to determine the current of the second fan when the first fan is off and the second fan is on, and the second fan is frosted on the second windward surface 12 but the defrosting condition is not met, I... 22 The minimum time interval t required to replace the fan after the first fan is restarted. gm1 Then, when it is determined that the outdoor heat exchanger 2 does not meet the defrosting conditions, the first fan is shut down and restarted, and the second fan is restarted, the current of the second fan is calculated. t1 is the minimum time interval t required to replace the fan after the first fan restarts. gm1 Then, determine the operating time of the first fan after it restarts when the outdoor heat exchanger 2 fails to meet the defrosting conditions. At this point, predict the minimum time interval t between the second fan restarting and the need to replace the fan. gm2 .

[0108] Step 21, the second fan is turned on again and runs to the minimum time interval t required for replacing the fan gm2 After that, it is determined whether the temperature of the outdoor heat exchanger 2 meets the defrosting condition according to the example shown in the figure: if it meets, the defrosting mode is turned on; if it does not meet, it returns to step 12 to turn on the first fan and turn off the second fan, and enters the cycle control of the double-fan alternating opening. Figure 13

[0109] In the scheme of the application, by controlling the second fan to run according to the corrected minimum running time interval after the second fan is turned on again, and then determining whether the outdoor heat exchanger 2 meets the preset defrosting condition for the third time, the operation of the double fan and the opening of the defrosting mode can be better controlled, the starting mode of the double fan is optimized, the heating time is as long as possible, frequent defrosting is avoided, precise defrosting is realized, the heating effect is improved, and indoor comfort is improved.

[0110] In some embodiments, the specific process of controlling the outdoor heat exchanger 2 to defrost in step S130 is described in the following example.

[0111] The following will be described in combination with Figure 6 The flowchart of an embodiment of controlling the outdoor heat exchanger 2 to defrost in the method of the application shown in the figure is further described, and the specific process of controlling the outdoor heat exchanger 2 to defrost in step S130 includes steps S610 to S640.

[0112] Step S610, in the case where it is necessary to determine whether the outdoor heat exchanger 2 meets the preset defrosting condition, it is determined whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current windward surface of the outdoor heat exchanger 2 is greater than or equal to the first preset temperature, and the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current leeward surface of the outdoor heat exchanger 2 is greater than or equal to the first preset temperature, i.e. it is determined for the first time whether the outdoor heat exchanger 2 meets the preset defrosting condition, or it is determined for the second time whether the outdoor heat exchanger 2 meets the preset defrosting condition, or it is determined for the third time whether the outdoor heat exchanger 2 meets the preset defrosting condition; wherein the current windward surface of the outdoor heat exchanger 2 is one of the first surface and the second surface of the outdoor heat exchanger 2, specifically one of the first surface and the second surface of the outdoor heat exchanger 2 on which one of the double fans is turned on; the current leeward surface of the outdoor heat exchanger 2 is the other of the first surface and the second surface of the outdoor heat exchanger 2, specifically the other of the first surface and the second surface of the outdoor heat exchanger 2 on which the other of the double fans is turned off.

[0113] ​Step S620, in the case where it is necessary to determine whether the outdoor heat exchanger 2 meets the preset defrosting condition, if it is determined that the outdoor heat exchanger 2 meets the preset defrosting condition, it is determined that the outdoor heat exchanger 2 meets the preset defrosting condition, so as to control the air conditioner to stop running in the heating mode and control the air conditioner to enter the preset defrosting mode to defrost the outdoor heat exchanger 2; of course, in the case where it is necessary to determine whether the outdoor heat exchanger 2 meets the preset defrosting condition, if it is determined that the outdoor heat exchanger 2 does not meet the preset defrosting condition, it is determined that the outdoor heat exchanger 2 does not meet the preset defrosting condition, so as to maintain the current running of the air conditioner in the heating mode.

[0114] Step S630, after controlling the air conditioner to enter the preset defrosting mode, it is determined whether the surface temperature of the current windward side of the outdoor heat exchanger 2 is greater than or equal to a second preset temperature and the surface temperature of the current leeward side of the outdoor heat exchanger 2 is greater than or equal to the second preset temperature; wherein the second preset temperature is greater than the first preset temperature.

[0115] Step S640, after controlling the air conditioner to enter the preset defrosting mode, if it is determined that the surface temperature of the current windward side of the outdoor heat exchanger 2 is greater than or equal to the second preset temperature and the surface temperature of the current leeward side of the outdoor heat exchanger 2 is greater than or equal to the second preset temperature, the air conditioner is controlled to exit the preset defrosting mode and start any one of the first fan and the second fan, that is, the fan that is first started in the heating mode of the air conditioner, such as the first fan, is re-entered into the heating mode of the air conditioner; of course, after controlling the air conditioner to enter the preset defrosting mode, if it is determined that the surface temperature of the current windward side of the outdoor heat exchanger 2 is not greater than or equal to the second preset temperature and the surface temperature of the current leeward side of the outdoor heat exchanger 2 is not greater than or equal to the second preset temperature, the defrosting of the outdoor heat exchanger 2 is maintained.

[0116] Figure 13 The control logic diagram of the start and end of the defrosting of the air conditioner is shown in Figure 14 The specific way of judging whether the temperature of the outdoor heat exchanger 2 meets the defrosting condition in steps 16, 19 and 21 can be seen from the example shown in Figure 13 As shown in Figure 13 The control logic of the start and end of the defrosting of the air conditioner includes:

[0117] Step 31, during the heating running, it is judged whether the difference between the outdoor ring temperature Tw and the temperature Ty of the current windward side and the difference between the outdoor ring temperature Tw and the temperature Tb of the current leeward side both meet the condition of being greater than or equal to the first preset temperature: if yes, it is judged that both sides of the outdoor heat exchanger 2 are frosted, and step 32 is executed to start the defrosting mode; otherwise, the air conditioner continues to run in the heating mode.

[0118] In step 31, alternating the operation of the two fans can only delay frost formation. However, if both sides of the outdoor heat exchanger 2 are frosted, it is necessary to detect the actual windward and leeward temperatures to determine whether to shut down and enter defrosting mode. For example, if the current windward temperature Ty is -8℃, the current leeward temperature Tb is -7℃, the outer ring temperature Tw is 0℃, and the first preset temperature is 6℃, then the temperature difference between the two sides of the outdoor heat exchanger 2 and the outer ring temperature Tw is 8℃ and 7℃ respectively, both of which are greater than the first preset temperature. Therefore, it is determined that both sides of the outdoor heat exchanger 2 are frosted, and defrosting mode is activated.

[0119] Step 32: Activate the defrosting mode to defrost the outdoor heat exchanger 2, and then proceed to step 33.

[0120] Step 33: When the current temperature Ty on the windward side and the current temperature Tb on the leeward side are both greater than or equal to the second preset temperature and maintained for the first preset duration, it is determined that the outdoor heat exchanger 2 has completed defrosting, and then step 34 is executed. For example: the first preset duration is 8 seconds, the second preset temperature is 10°C, and the temperature on both sides of the outdoor heat exchanger 2 is detected to be higher than 10°C and maintained for 8 seconds, it is determined that the defrosting exit condition is met, and the air conditioner is controlled to stop defrosting.

[0121] Step 34: After the air conditioner defrosts, you can turn on any fan to re-enter the heating mode.

[0122] The present invention addresses the outdoor unit structure with dual fans by optimizing the start-up and shutdown of the dual fans based on changes in system parameters, thereby optimizing the control of heating and defrosting. During the heating process, it monitors the current change and running time of one fan on the outdoor unit with dual fans and the starting current of the other fan to determine the minimum time interval for replacing the fans, optimizes the start-up method of the dual fans, extends the heating time as much as possible, and avoids frequent defrosting.

[0123] In some embodiments, step S130 combines the current of the first fan and the operating time of the first fan, as well as the current of the second fan and the operating time of the second fan, to correct the time interval between the alternating start-up of the first fan and the second fan, including at least one of the following correction processes: a first correction process and a second correction process.

[0124] First type of correction process:

[0125] The following is combined with Figure 7 The flowchart shown is a schematic diagram of an embodiment of the first correction process for correcting the time interval between the alternating start-up of the first fan and the second fan in the method of the present invention. The specific process of the first correction process for correcting the time interval between the alternating start-up of the first fan and the second fan in step S130 is further explained, including steps S710 to S720.

[0126] Step S710, in one cycle, the current of the first fan when the first face of the outdoor heat exchanger 2 is determined to be frosting is recorded as the first current of the first fan (such as the current I 11 of the first fan), the running time of the second fan when the outdoor heat exchanger 2 is determined for the first time to not meet the preset defrosting condition is recorded as the on time of the second fan (such as the total on time t2 of the second fan), the current of the second fan is recorded as the first current of the second fan (such as the current I 21 of the second fan), and the current of the first fan when the first fan is controlled to be turned on again is recorded as the second current of the first fan (such as the current I 12 of the first fan when the first fan is turned on again).

[0127] Step S720, the difference between the first current of the second fan and the second current of the first fan is determined, the ratio of the difference to the difference between the first current of the first fan and the second current of the first fan is determined, and the product of the ratio and the on time of the second fan is determined as the corrected minimum running time interval after the first fan is turned on again, so as to obtain the corrected time interval of the first fan and the second fan alternately turned on; wherein the corrected minimum running time interval after the first fan is turned on again is, for example, the minimum replacement time interval t gm1 of the first fan.

[0128] Specifically, as shown in Figure 14 , the control logic of the first fan and the second fan alternately running in the outdoor unit of the air conditioner further comprises: in step 18, predicting the minimum time interval t gm1 of the first fan running to the need for replacing the fan after the first fan is turned on again, t gm1 = (I 21 -I 12 ) / (I 11 -I 12 )*t2. Wherein I 21 is the current of the second fan when the second fan is determined to be frosting on the second windward face 12 but does not meet the defrosting condition after the first fan is turned on and the second fan is turned off. I 11 is the current of the first fan when the first fan is determined to be frosting on the first windward face 11 under the condition that the first fan is turned on and the second fan is turned off. t2 is the total running time of the second fan when the second fan is determined to be frosting on the second windward face 12 but does not meet the defrosting condition after the first fan is turned off and the second fan is turned on. I 12To determine if the first windward surface 11 is frosted when the first fan is on and the second fan is off, and to switch to the case where the first fan is off and the second fan is on, if the second windward surface 12 is frosted but the defrosting conditions are not met, the second fan is turned off, and the current of the first fan is turned on again.

[0129] In the solution of the present invention, by correcting the minimum operating time interval after the first fan is restarted, the operation of the first fan and the activation of the defrosting mode can be better controlled, the start-up method of the dual fans can be optimized, the heating time can be extended as much as possible, frequent defrosting can be avoided, precise defrosting can be achieved, the heating effect can be improved, and the indoor comfort can be enhanced.

[0130] The second correction process:

[0131] The following is combined Figure 8 The schematic diagram shows an embodiment of the second correction process for correcting the time interval between the alternating start-up of the first fan and the second fan in the method of the present invention. The specific process of the second correction process for correcting the time interval between the alternating start-up of the first fan and the second fan in step S130 is further explained, including steps S810 to S820.

[0132] Step S810: Within one cycle, the current of the first fan when the first surface of the outdoor heat exchanger 2 is frosted is recorded as the first current of the first fan (e.g., the current I of the first fan). 11 The current of the second fan when it is first determined that the outdoor heat exchanger 2 does not meet the preset defrosting conditions is recorded as the first current of the second fan (e.g., the current of the second fan is I). 21 The running time of the first fan when the outdoor heat exchanger 2 fails to meet the preset defrosting conditions is recorded as the start-up time of the first fan (e.g., the start-up time t1 of the first fan), and the current of the first fan is recorded as the third current of the first fan (e.g., the current I of the first fan). 31 The current of the second fan when it restarts is recorded as the second current of the second fan (e.g., the current of the second fan is I). 22 ).

[0133] Step S820: Determine the difference between the third current of the first fan and the second current of the second fan; determine the ratio of this difference to the difference between the first current and the second current of the second fan; determine the product of this ratio and the start-up time of the first fan; use this product as the minimum operating time interval after the second fan restarts, thus obtaining the corrected time interval for the alternating start-up of the first and second fans. The corrected minimum operating time interval after the second fan restarts is, for example, the minimum replacement time interval of the second fan (e.g., minimum time interval t). gm2 ).

[0134] Specifically, such as Figure 14 As shown, the control logic for the alternating operation of the first and second fans in the outdoor unit of the air conditioner further includes, in step 20, predicting the minimum time interval t between the second fan restarting and the need to replace the fan. gm2 =(I 31 -I 22 ) / (I 21 -I 22 )*t1. Where, I 31 The minimum time interval t required to replace the fan after the first fan is restarted. gm1 Then, determine the current of the first fan when the outdoor heat exchanger 2 does not meet the defrosting conditions. 21 To determine if the first windward surface 11 is frosted when the first fan is on and the second fan is off, and to determine the current of the second fan when the first fan is off and the second fan is on, and the second fan is frosted on the second windward surface 12 but the defrosting condition is not met, I... 22 The minimum time interval t required to replace the fan after the first fan is restarted. gm1 Then, when it is determined that the outdoor heat exchanger 2 does not meet the defrosting conditions, the first fan is shut down and restarted, and the second fan is restarted, the current of the second fan is calculated. t1 is the minimum time interval t required to replace the fan after the first fan restarts. gm1 Then, determine the running time of the first fan after it restarts when the outdoor heat exchanger 2 does not meet the defrosting conditions.

[0135] In the solution of the present invention, by correcting the minimum operating time interval after the second fan is turned on again, the operation of the second fan and the activation of the defrosting mode can be better controlled, the start-up method of the dual fans can be optimized, the heating time can be extended as much as possible, frequent defrosting can be avoided, precise defrosting can be achieved, the heating effect can be improved, and the indoor comfort can be enhanced.

[0136] The technical scheme is adopted in the embodiment, the outdoor fan of the air conditioner outdoor unit includes the first fan in the first fan cavity (such as the first fan cavity 3) corresponding to the two sides of the outdoor heat exchanger and the second fan in the second fan cavity (such as the second fan cavity 3), the first inlet (such as the first inlet 9) and the second inlet (such as the second inlet 10) are arranged corresponding to the first fan and the second fan, any one of the first inlet and the second inlet can be blocked by the baffle device (such as the device composed of the motor 4, the gear 5, the baffle 8 and the rack 6 on the baffle) to adjust the air path; when the air conditioner is running in heating mode, the first fan is opened and the second fan is closed, the second inlet is blocked to form the air path of the first inlet and the first fan cavity; when the difference between the outer ring temperature and the temperature of the first windward surface (i.e. one side of the outdoor heat exchanger where the first fan is located) is greater than the first preset temperature, it is judged that the first windward surface is frosted, the current of the first fan is recorded and recorded as the first current of the first fan (such as the current I 11 of the first fan), the first fan is closed and the second fan is opened, the first inlet is blocked to form the air path of the second inlet and the second fan cavity; when the difference between the outer ring temperature and the temperature of the second windward surface (i.e. one side of the outdoor heat exchanger where the second fan is located) is greater than the first preset temperature, it is judged that the second windward surface is frosted, whether the outdoor heat exchanger meets the defrosting condition is judged: when the outdoor heat exchanger meets the defrosting condition, heating is stopped to enter defrosting, when the outdoor heat exchanger does not meet the defrosting condition, the opening time of the second fan (such as the total opening time of the second fan t2) is recorded, the current of the second fan is recorded and recorded as the first current of the second fan (such as the current of the second fan I 21 ), the second fan is closed and the first fan is opened again, the second time the second inlet is blocked to form the air path of the first inlet and the first fan cavity, the current of the first fan when it is opened again is recorded and recorded as the second current of the first fan (such as the current of the first fan when it is opened again I 12 ); according to the first current of the first fan, the second current of the first fan, the first current of the second fan and the opening time of the second fan, the minimum time interval of the first fan running after being opened again to the need to replace the fan is predicted and recorded as the minimum replacement time interval of the first fan (such as the minimum time interval t gm1 ); after the first fan is opened again, the minimum replacement time interval of the first fan is run, whether the outdoor heat exchanger meets the defrosting condition is judged again: when the outdoor heat exchanger meets the defrosting condition again, heating is stopped to enter defrosting, when the outdoor heat exchanger does not meet the defrosting condition again, the opening time of the first fan (such as the opening time t1 of the first fan) is recorded, the current of the first fan when it does not meet the defrosting condition after being opened again is recorded and recorded as the third current of the first fan (such as the current of the first fan I 31), the first fan is closed again and the second fan is opened again, the current of the second fan opened again is recorded and is recorded as the second current of the second fan (for example, the current of the second fan is I 22 ), according to the first current of the second fan, the second current of the second fan, the third current of the first fan, and the opening time of the first fan, the minimum time interval of the second fan running after the second fan is opened again and needs to be replaced is predicted and is recorded as the minimum replacement time interval of the second fan (for example, the minimum time interval t gm2 ) is recorded as the minimum replacement time interval of the second fan (for example, the minimum time interval t gm2 ); after the second fan runs for the minimum replacement time interval after the second fan is opened again, whether the outdoor heat exchanger meets the defrosting condition is judged for the third time: when the outdoor heat exchanger meets the defrosting condition, the heating is stopped and the defrosting is entered; when the outdoor heat exchanger does not meet the defrosting condition, the first fan is opened again and the second fan is closed, and the cycle control of the alternating opening of the first fan and the second fan is performed; thereby, through the cycle control of the alternating opening of the double fans (that is, the first fan and the second fan) of the outdoor unit, the opening of the defrosting mode is judged according to the difference between the outdoor ring temperature and the surface temperature of the outdoor heat exchanger, and the time interval of the alternating opening of the double fans is corrected according to the change of the double fan current after the defrosting opportunity is judged, the starting mode of the double fans can be optimized, the heating time is as long as possible, the frequent defrosting or frost not defrosting is avoided, the precise defrosting is realized, and the indoor comfort is improved.

[0137] According to the embodiment of the present application, a control device of an air conditioner corresponding to the control method of the air conditioner is also provided. Referring to Figure 9 , an embodiment of the structure schematic diagram of the device of the present application is shown. The outdoor unit of the air conditioner has an outdoor heat exchanger 2, an outdoor fan, an outdoor air inlet, and a shielding device; the outdoor fan includes a first fan arranged in a first fan cavity 1 and a second fan arranged in a second fan cavity 3, the first fan cavity 1 is located at a first surface of the outdoor heat exchanger 2, and the second fan cavity 3 is located at a second surface of the outdoor heat exchanger 2; the outdoor air inlet includes a first air inlet 9 and a second air inlet 10, and the shielding device can shield any one of the first air inlet 9 and the second air inlet 10; wherein the first surface of the outdoor heat exchanger 2 and the second surface of the outdoor heat exchanger 2 are two opposite surfaces, one of which is a windward surface and the other of which is a leeward surface. The scheme of the present application is aimed at a double-fan outdoor unit structure, specifically, Figure 10 , a structure schematic diagram of the outdoor unit of the air conditioner is shown. As Figure 10 , the double-fan outdoor unit structure includes an outdoor heat exchanger 2, a first fan cavity 1, and a second fan cavity 3, there is an opening 7 on the side plate of the outdoor unit shell for ventilation; a motor 4 is arranged above the side plate of the outdoor unit shell for driving the gear 5 to rotate; a baffle 8 is arranged on the side plate of the outdoor unit shell, and a rack 6 is arranged above the baffle 8, the rack 6 is engaged with the gear 5.

[0138] Figure 11 It is a structure schematic view when the outdoor unit is in state 1. As shown in the figure, the first fan cavity 1 is provided with the first fan, when heating, the motor 4 rotates to make the baffle 8 block the second air inlet 10, the first air inlet 9 and the first fan cavity 1 form the air path, one side of the outdoor heat exchanger 2 of the first fan cavity 1 is the first windward surface 11, and one side of the outdoor heat exchanger 2 of the second fan cavity 3 is the leeward surface. Figure 11

[0139] It is a structure schematic view when the outdoor unit is in state 2. As shown in the figure, the second fan cavity 3 is provided with the second fan, when the fan is replaced to operate, the motor 4 rotates to make the baffle 8 block the first air inlet 9, the second air inlet 10 and the second fan cavity 3 form the air path, one side of the outdoor heat exchanger 2 of the second fan cavity 3 is the second windward surface 12, and one side of the outdoor heat exchanger 2 of the first fan cavity 1 is the leeward surface. Figure 12 Figure 12

[0140] In the scheme of the application, the double fan structure is adopted, in the process of the double fan alternating operation, the two sides of the evaporator (i.e. the outdoor heat exchanger 2) become the windward surface and the leeward surface alternately, since the windward surface of the evaporator is more prone to frost, in the process of the windward surface on one side becoming the leeward surface, the frost degree can be relieved to a certain extent, so that the heating time can be prolonged, and the air conditioner does not need to be frequently stopped for defrosting.

[0141] In the scheme of the application, as shown in the figure, the control device of the air conditioner comprises an acquisition unit 102 and a control unit 104. Figure 9

[0142] The control unit 104 is configured to control the first fan to be opened, control the second fan to be closed, and control the blocking device to block the second air inlet 10, so that the first air inlet 9 and the first air inlet cavity 1 form the air path after the air conditioner is started in the heating mode. The specific functions and processes of the control unit 104 are described in step S110. The first fan and the second fan are relative, one fan in the double fan of the outdoor unit is the first fan, and the other fan is the second fan. Here, it is assumed that the first fan is opened, the second fan is closed, and the second air inlet 10 is blocked after the air conditioner is started in the heating mode. Of course, the second fan can be opened first, the first fan can be closed, and the first air inlet 9 can be blocked.

[0143] ​​​The acquisition unit 102 is configured to acquire the outdoor environment temperature of the air conditioner, acquire the surface temperature of the first surface of the outdoor heat exchanger 2, acquire the surface temperature of the second surface of the outdoor heat exchanger 2, acquire the current of the first fan and the running time of the first fan, and acquire the current of the second fan and the running time of the second fan when the air conditioner is running in the heating mode. The specific functions and processes of the acquisition unit 102 are described in step S120.

[0144] The control unit 104 is further configured to control the first fan and the second fan to be alternately turned on in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger 2, and the surface temperature of the second surface of the outdoor heat exchanger 2, and control the outdoor heat exchanger 2 to defrost. The specific functions and processes of the control unit 104 are also described in step S130.

[0145] The control unit 104 is further configured to correct the time interval of the first fan and the second fan to be alternately turned on in combination with the current of the first fan, the running time of the first fan, the current of the second fan, and the running time of the second fan during the process of controlling the first fan and the second fan to be alternately turned on, and / or after controlling the outdoor heat exchanger 2 to defrost, and control the first fan and the second fan to be alternately turned on according to the corrected time interval of the first fan and the second fan to be alternately turned on, so as to better control the operation of the double fans and the turning on of the defrosting mode. The specific functions and processes of the control unit 104 are also described in step S130. Wherein, the correction of the time interval of the first fan and the second fan to be alternately turned on specifically includes: correcting the minimum running time interval after the first fan is turned on again in combination with the current of the first fan, the current of the second fan, and the running time of the second fan; and correcting the minimum running time interval after the second fan is turned on again in combination with the current of the first fan, the current of the second fan, and the running time of the first fan, to obtain the minimum running time interval after the second fan is turned on again.

[0146] The scheme of the present application provides a control scheme of an outdoor unit with a double-fan structure, so as to solve the problems that the time interval of the double fans is difficult to determine, the frequency of replacing the fan is difficult to control in a proper range, and the defrosting time point is not clear. According to the scheme of the present application, the opening of the defrosting mode can be determined according to the difference between the ambient temperature and the surface temperature of the outdoor heat exchanger, so as to avoid the problem that the frost on the outdoor unit is not defrosted. The time interval of the double fans is corrected according to the current change of the double fans after the defrosting opportunity is determined, so as to better control the operation of the double fans and the opening of the defrosting mode, optimize the starting mode of the double fans, prolong the heating time as much as possible, and avoid frequent defrosting. Therefore, precise defrosting is realized, the heating effect is improved, and the indoor comfort is improved.

[0147] In some embodiments, the control unit 104 controls the first fan and the second fan to open alternately and controls the outdoor heat exchanger 2 to defrost in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger 2, and the surface temperature of the second surface of the outdoor heat exchanger 2, and the control includes: controlling the first process of the first fan and the second fan to open alternately and the outdoor heat exchanger 2 to defrost, specifically as follows:

[0148] The control unit 104 is specifically further configured to determine whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger 2 is greater than or equal to a first preset temperature in the case that the first fan is opened, the second fan is closed, and the shielding device shields the second air inlet 10. The specific functions and processes of the control unit 104 also refer to step S210.

[0149] The control unit 104 is specifically further configured to maintain the first fan to be opened, the second fan to be closed, and the shielding device to shield the second air inlet 10 if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger 2 is less than the first preset temperature. The specific functions and processes of the control unit 104 also refer to step S220.

[0150] The control unit 104 is specifically further configured to determine that the first surface of the outdoor heat exchanger 2 is frosted if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger 2 is greater than or equal to the first preset temperature, record the current of the first fan at this time as the first current of the first fan, control the first fan to be closed, control the second fan to be opened, and control the shielding device to shield the first air inlet 9, so as to form an air path between the second air inlet 10 and the second air inlet cavity 3. At this time, the first alternately opening of the first fan and the second fan is realized, and the outdoor heat exchanger 2 is defrosted for the first time. The specific functions and processes of the control unit 104 also refer to step S230.

[0151] Specifically, Figure 14 The control logic diagram for the first and second fans in the outdoor unit of the air conditioner to run alternately. As Figure 14 shown, the control logic for the first and second fans in the outdoor unit of the air conditioner to run alternately, comprising:

[0152] Step 11, the air conditioner runs in heating mode, then step 12 is executed.

[0153] Step 12, when the air conditioner runs in heating mode, first start the first fan, the second fan is closed, the motor 4 controls the gear 5 to rotate, so that the baffle 8 blocks the second air inlet 10, then step 13 is executed.

[0154] In step 12, the first fan is started, the second fan is closed, the motor 4 controls the gear 5 to rotate, so that the baffle 8 blocks the second air inlet 10, the first air inlet 9 and the first fan cavity 1 form an air path, and the wind can enter the first fan cavity 1 from the second fan cavity 3 and the first air inlet 9 at the same time, thereby increasing the air inlet area.

[0155] Step 13, determine whether the difference between the outer ring temperature Tw and the temperature Ty1 of the first windward surface 11 is greater than the first preset temperature: if yes, determine that the first windward surface 11 is frosted, execute step 14; if not, determine that the first windward surface 11 is not frosted, then return to step 12 to continue heating operation.

[0156] For example: the temperature of the first windward surface 11 is -5℃, the outer ring temperature is 2℃, and the first preset temperature is 6℃, then the difference between the outer ring temperature Tw and the temperature Ty1 of the first windward surface 11 is 7℃, which is higher than the first preset temperature, so it is determined that the first windward surface 11 is frosted, and the second fan needs to be started to replace the windward surface. By changing the air path, the windward surface of the evaporator (i.e. the outdoor heat exchanger 2) at the beginning becomes a leeward surface, which can delay the frosting of the leeward surface, and even the leeward surface does not frost, so that the air conditioner does not need to defrost frequently, and the heating time is increased.

[0157] Step 14, in the case where it is determined that the first windward surface 11 is frosted, record the current of the first fan I 11 , close the first fan, start the second fan, the motor 4 controls the gear 5 to rotate so that the baffle 8 blocks the first air inlet 9, then step 15 is executed.

[0158] In step 14, the first fan is closed, the second fan is started, the motor 4 controls the gear 5 to rotate so that the baffle 8 blocks the first air inlet 9, the second air inlet 10 and the second fan cavity 3 form an air path, and the wind can enter the second fan cavity 3 from the second fan cavity 3 and the second air inlet 10 at the same time, thereby increasing the air inlet area.

[0159] In the scheme of the present application, by combining the outdoor environment temperature of the air conditioner, the surface temperature of the first face of the outdoor heat exchanger 2, and the surface temperature of the second face of the outdoor heat exchanger 2, the first fan and the second fan are alternately turned on, and the outdoor heat exchanger 2 is defrosted, avoiding frost on the outdoor unit not being defrosted, avoiding frequent defrosting, realizing precise defrosting, improving the heating effect, and improving the indoor comfort.

[0160] In some embodiments, the control unit 104, in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first face of the outdoor heat exchanger 2, and the surface temperature of the second face of the outdoor heat exchanger 2, controls the first fan and the second fan to be alternately turned on, and controls the outdoor heat exchanger 2 to be defrosted, and further comprises: a second process of controlling the first fan and the second fan to be alternately turned on and the outdoor heat exchanger 2 to be defrosted, i.e., a specific process of controlling the outdoor heat exchanger 2 to be defrosted for the first time, which is specifically as follows:

[0161] The control unit 104 is specifically further configured to, when the first fan is turned off, the second fan is turned on, and the shielding device shields the first air inlet 9, i.e., when the first fan and the second fan are alternately turned on for the first time, determine whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second face of the outdoor heat exchanger 2 is greater than or equal to a first preset temperature. The specific functions and processes of this control unit 104 are also referred to step S310.

[0162] The control unit 104 is specifically further configured to, if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second face of the outdoor heat exchanger 2 is less than the first preset temperature, maintain the first fan to be turned off, the second fan to be turned on, and the shielding device to shield the first air inlet 9. The specific functions and processes of this control unit 104 are also referred to step S320.

[0163] The control unit 104 is specifically further configured to, if it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second face of the outdoor heat exchanger 2 is greater than or equal to the first preset temperature, first determine whether the outdoor heat exchanger 2 meets a preset defrosting condition according to the outdoor environment temperature of the air conditioner, the surface temperature of the first face of the outdoor heat exchanger 2, and the surface temperature of the second face of the outdoor heat exchanger 2. The specific functions and processes of this control unit 104 are also referred to step S330.

[0164] The control unit 104 is further configured to control the air conditioner to stop running in the heating mode and enter a preset defrosting mode to defrost the outdoor heat exchanger 2 if it is determined for the first time that the outdoor heat exchanger 2 meets the preset defrosting condition. The specific functions and processes of the control unit 104 are also described in step S340.

[0165] The control unit 104 is further configured to record the running time of the second fan at this time as the opening time of the second fan, record the current of the second fan at this time as the first current of the second fan, control the second fan to be closed, control the first fan to be opened again, record the current of the first fan at this time as the second current of the first fan, and control the blocking device to block the second air inlet 10 so as to form an air path between the first air inlet 9 and the first air inlet cavity 1. Thus, the second time of alternately opening the first fan and the second fan is realized, and then the time interval of alternately opening the first fan and the second fan is corrected by combining the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan for the first time. Specifically, the minimum running time interval after the first fan is opened again is corrected, and the first fan and the second fan are controlled to be alternately opened according to the corrected time interval of alternately opening the first fan and the second fan, so as to better control the running of the double fans and the opening of the defrosting mode. The specific functions and processes of the control unit 104 are also described in step S350.

[0166] Specifically, as shown in Figure 14 The control logic of alternately running the first fan and the second fan in the outdoor unit of the air conditioner further includes:

[0167] Step 15: Determine whether the difference between the outdoor ring temperature Tw and the temperature Ty2 of the second windward surface 12 is greater than the first preset temperature. If yes, it is determined that the second windward surface 12 is frosted, and then step 16 is performed. Otherwise, it is determined that the second windward surface 12 is not frosted, and the process returns to step 14 for continuous running.

[0168] Step 16: Determine whether the defrosting condition is met. If the defrosting condition is met, the air conditioner stops heating and enters defrosting. If the defrosting condition is not met, record the total opening time of the second fan as t2, and then perform step 17.

[0169] Step 17: Record the current of the second fan at this time as I 21 , close the second fan, open the first fan, control the gear 5 to rotate by the motor 4 to make the baffle 8 block the second air inlet 10, and record the current of the first fan when it is opened again as I 12, and then step 18 is performed to predict the minimum time interval t required for the first fan to run again until the fan needs to be replaced gm1 .

[0170] In step 17, the current I of the first fan when it is turned on again is recorded 12 Since the evaporator on the side of the first fan is on the leeward side before, it is also possible to frost (but the degree of frosting is lower than that on the windward side), and the recorded current when it becomes the windward side is equivalent to recording the initial current of the first fan on the current windward side, so as to judge the initial frosting condition of the current windward side by the current I of the first fan when it is turned on again. 12 .

[0171] In the scheme of the present application, by monitoring the temperature of the outdoor heat exchanger of the double-fan air conditioner on both sides of the outdoor heat exchanger, the difference between the ambient temperature and the surface temperature on both sides is calculated to determine whether the defrosting condition is met, and the outdoor unit is controlled to enter the defrosting mode; by monitoring the temperature point reached by the outdoor heat exchanger and the residence time at the temperature point, it is determined whether the defrosting mode is ended. In this way, by monitoring the difference between the temperature of the windward side and the leeward side of the outdoor heat exchanger and the ambient temperature, it is determined whether the outdoor unit enters the defrosting mode, avoiding the problem of frost not being defrosted on the outdoor unit.

[0172] In some embodiments, the control unit 104, in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, corrects the time interval of the first fan and the second fan alternately turned on, specifically including: the control unit 104 is specifically further configured to combine the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, to correct the time interval of the first fan and the second fan alternately turned on, to obtain the minimum running time interval of the first fan after being turned on again as the corrected time interval of the first fan and the second fan alternately turned on.

[0173] The control unit 104, in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first side of the outdoor heat exchanger 2, and the surface temperature of the second side of the outdoor heat exchanger 2, controls the first fan and the second fan to be turned on alternately, and controls the outdoor heat exchanger 2 to defrost, and further includes: a third process of controlling the first fan and the second fan to be turned on alternately and the outdoor heat exchanger 2 to defrost, that is, a specific process of correcting the minimum running time interval of the first fan after being turned on again, which is specifically as follows:

[0174] The control unit 104 is further configured to correct the time interval of the first and second fans alternately opening in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, and obtain the minimum running time interval of the first fan after the first fan is opened again as the corrected time interval of the first and second fans alternately opening when the second fan is closed, the first fan is opened again, and the shielding device shields the second air inlet 10. Specifically, the minimum running time interval of the first fan after the first fan is opened again is corrected in combination with the current of the first fan, the current of the second fan, and the running time of the second fan to obtain the minimum running time interval of the first fan after the first fan is opened again. The specific functions and processes of the control unit 104 are also described in step S410.

[0175] The control unit 104 is further configured to control the first fan to run for the corrected minimum running time interval after the first fan is opened again, and then determine whether the outdoor heat exchanger 2 meets the preset defrosting condition for the second time. The specific functions and processes of the control unit 104 are also described in step S420.

[0176] The control unit 104 is further configured to control the air conditioner to stop running in the heating mode and enter the preset defrosting mode to defrost the outdoor heat exchanger 2 if it is determined for the second time that the outdoor heat exchanger 2 meets the preset defrosting condition. The specific functions and processes of the control unit 104 are also described in step S430.

[0177] The control unit 104 is further configured to, if it is determined for the second time that the outdoor heat exchanger 2 does not satisfy the preset defrosting condition, record the running time of the first fan at this time as the opening time of the first fan, record the current of the first fan at this time as the third current of the first fan, control the first fan to be closed, control the second fan to be opened again, record the current of the second fan at this time as the second current of the second fan, and control the shielding device to shield the first air inlet 9 so that the second air inlet 10 and the first air inlet cavity 3 form an air path; thus, the third time of alternating opening of the first fan and the second fan is realized, and then the time interval of the first fan and the second fan for alternating opening is corrected by combining the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan for the second time, specifically, the minimum running time interval after the second fan is opened again is corrected, and the first fan and the second fan are controlled to be alternately opened according to the corrected time interval of the first fan and the second fan for alternating opening, so as to better control the operation of the double fans and the opening of the defrosting mode. The specific functions and processes of the control unit 104 are also described in step S440.

[0178] Specifically, as shown in Figure 14 , the control logic of the first fan and the second fan for alternating operation in the outdoor unit of the air conditioner further includes:

[0179] Step 18, predicting the minimum time interval t gm1 after the first fan is opened again and runs to the time when the fan needs to be replaced, and then performing step 19.

[0180] In step 18, during the running of the first fan after it is opened again, the frosting degree of the first windward surface 11 is alleviated, and the defrosting rate of the first windward surface 11 is represented by the current (I 11 -I 12 ) / t1. Wherein, I 11 is the current of the first fan when the first windward surface 11 is determined to be frosted under the condition that the first fan is opened and the second fan is closed. t2 is the total running time of the second fan when the second windward surface 12 is determined to be frosted but does not satisfy the defrosting condition after the first fan is opened and the second fan is closed, and the first fan is closed and the second fan is opened. I 12 is the current of the first fan when the first fan is opened again after the second fan is closed.

[0181] According to the current of the first fan and the second fan and the opening time t2 of the second fan, the minimum time interval t is predicted for the first fan to run again to the time when the fan needs to be replaced gm1 . The running time of the fan replacement is predicted by the change of the actual current and the time of the last fan opening.

[0182] Step 19, when the first fan runs again for the minimum time interval t gm1 , it is judged whether the temperature of the outdoor heat exchanger 2 meets the defrosting condition: if yes, the air conditioner is controlled to stop heating, defrosting is started, and then step 20 is executed; otherwise, step 20 is directly executed to predict the minimum time interval t gm2 .

[0183] In the scheme of the present application, for the outdoor unit of the double-fan air conditioner, a control scheme of the heating mode double-fan operation and defrosting is proposed. The current change of the current starting fan is calculated by monitoring the current change of the fan just after starting and the current starting fan when the frost is formed on the current windward surface. Then, according to the current of the other side fan and the stop current of the last fan, the minimum time interval for the next fan replacement is predicted. In this way, by monitoring the current change and running time of the fan on one side of the outdoor unit of the double-fan structure during the heating process, and the starting current of the fan on the other side, the minimum time interval for the fan replacement is judged, the starting mode of the double-fan is optimized, the heating time is as long as possible, and the frequent defrosting is avoided.

[0184] In some embodiments, the control unit 104, in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, corrects the time interval of the first fan and the second fan alternately starting, and specifically further comprises: the control unit 104 is specifically further configured to combine the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, correct the time interval of the first fan and the second fan alternately starting, and obtain the minimum running time interval of the second fan after starting again as the corrected time interval of the first fan and the second fan alternately starting.

[0185] The control unit 104 is specifically further configured to combine the outdoor environment temperature of the air conditioner, the surface temperature of the first side of the outdoor heat exchanger 2, and the surface temperature of the second side of the outdoor heat exchanger 2, control the first fan and the second fan alternately starting, and control the outdoor heat exchanger 2 defrosting, and further comprises: a fourth process of controlling the first fan and the second fan alternately starting and the outdoor heat exchanger 2 defrosting, that is, a specific process of correcting the minimum running time interval of the second fan after starting again, which is specifically as follows:

[0186] The control unit 104 is further configured to correct the time interval of the first and second fans alternately opening, in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, to obtain the corrected minimum running time interval of the second fan after the second fan is opened again as the corrected time interval of the first and second fans alternately opening, in the case that the first fan is closed, the second fan is opened again, and the shielding device shields the first air inlet 9. Specifically, the minimum running time interval of the second fan after the second fan is opened again is corrected in combination with the current of the first fan, the current of the second fan and the running time of the first fan, to obtain the minimum running time interval of the second fan after the second fan is opened again. The specific functions and processes of the control unit 104 are also described in step S510.

[0187] The control unit 104 is further configured to control the second fan to run for the corrected minimum running time interval of the second fan after the second fan is opened again, and then determine whether the outdoor heat exchanger 2 meets the preset defrosting condition for the third time. The specific functions and processes of the control unit 104 are also described in step S520.

[0188] The control unit 104 is further configured to control the air conditioner to stop running in the heating mode and enter the preset defrosting mode to defrost the outdoor heat exchanger 2, if it is determined for the third time that the outdoor heat exchanger 2 meets the preset defrosting condition. The specific functions and processes of the control unit 104 are also described in step S530.

[0189] The control unit 104 is further configured to complete the control of one cycle period, and then return to control the first fan to open, control the second fan to close, and control the shielding device to shield the second air inlet 10, if it is determined for the third time that the outdoor heat exchanger 2 does not meet the preset defrosting condition, so as to enter the control of the next cycle period, and so on. The specific functions and processes of the control unit 104 are also described in step S540.

[0190] Specifically, as shown in FIG. 8, the control logic of the first and second fans alternately running in the outdoor unit of the air conditioner further includes: Figure 14

[0191] Step 20, predicting the minimum time interval t of the second fan after the second fan is opened again to run to the need to replace the fan gm2 , and then performing step 21.

[0192] In step 20, if the first fan after the second fan is opened again runs for the minimum time interval t of the fan replacement​gm1 After that, if the temperature of the outdoor heat exchanger 2 does not satisfy the defrosting condition, the opening time t1 of the first fan at this time is recorded, and the current I 31 of the first fan at this time is recorded. 22 During the operation of the second fan after it is opened again, the frosting degree of the second windward surface 12 is alleviated, and the defrosting rate of the second windward surface 12 is represented by the current (I 21 -I 22 ) / t1. Wherein, I 21 is the current of the second fan when the first fan is opened and the second fan is closed, the frosting of the first windward surface 11 is determined, and after switching to the first fan being closed and the second fan being opened, the frosting of the second windward surface 12 is determined, but the current of the second fan does not satisfy the defrosting condition. 22 I gm1 is the current of the second fan when the first fan is opened again and the second fan is closed after the outdoor heat exchanger 2 does not satisfy the defrosting condition, and the first fan is closed and the second fan is opened again. gm1 t1 is the operation time of the first fan after it is opened again, and the outdoor heat exchanger 2 does not satisfy the defrosting condition. At this time, it is predicted that the second fan will be opened again to run to the minimum time interval t gm2 .

[0193] Step 21, after the second fan is opened again to run to the minimum time interval t gm2 , it is determined whether the temperature of the outdoor heat exchanger 2 satisfies the defrosting condition according to the example shown in Figure 13 : if it satisfies, the defrosting mode is opened; if it does not satisfy, it returns to step 12 to open the first fan and close the second fan, and enters the cycle control of the double-fan alternating opening.

[0194] In the scheme of the application, by controlling the second fan to run according to the corrected minimum running time interval of the second fan after it is opened again, and then determining whether the outdoor heat exchanger 2 satisfies the preset defrosting condition for the third time, the operation of the double fan and the opening of the defrosting mode can be better controlled, the starting mode of the double fan is optimized, the heating time is as long as possible, frequent defrosting is avoided, precise defrosting is realized, the heating effect is improved, and the indoor comfort is improved.

[0195] In some embodiments, the control unit 104 controls the defrosting of the outdoor heat exchanger 2, comprising:

[0196] The control unit 104 is specifically further configured to, in the case where it is necessary to determine whether the outdoor heat exchanger 2 meets the preset defrosting condition, determine whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current windward surface of the outdoor heat exchanger 2 is greater than or equal to a first preset temperature, and the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current leeward surface of the outdoor heat exchanger 2 is greater than or equal to the first preset temperature, i.e., to determine whether the outdoor heat exchanger 2 meets the preset defrosting condition for the first time, or to determine whether the outdoor heat exchanger 2 meets the preset defrosting condition for the second time, or to determine whether the outdoor heat exchanger 2 meets the preset defrosting condition for the third time. The current windward surface of the outdoor heat exchanger 2 is one of the first surface and the second surface of the outdoor heat exchanger 2, and specifically is the surface on which one of the two fans is turned on. The current leeward surface of the outdoor heat exchanger 2 is the other of the first surface and the second surface of the outdoor heat exchanger 2, and specifically is the surface on which the other of the two fans is turned off. For specific functions and processes of the control unit 104, see step S610.

[0197] The control unit 104 is specifically further configured to, in the case where it is necessary to determine whether the outdoor heat exchanger 2 meets the preset defrosting condition, if it is determined that the preset defrosting condition is met, determine that the outdoor heat exchanger 2 meets the preset defrosting condition, so as to control the air conditioner to stop running in the heating mode and enter the preset defrosting mode to defrost the outdoor heat exchanger 2. Of course, in the case where it is necessary to determine whether the outdoor heat exchanger 2 meets the preset defrosting condition, if it is determined that the preset defrosting condition is not met, it is determined that the outdoor heat exchanger 2 does not meet the preset defrosting condition, so as to maintain the current running of the air conditioner in the heating mode. For specific functions and processes of the control unit 104, see step S620.

[0198] The control unit 104 is specifically further configured to, after controlling the air conditioner to enter the preset defrosting mode, determine whether the surface temperature of the current windward surface of the outdoor heat exchanger 2 is greater than or equal to a second preset temperature, and the surface temperature of the current leeward surface of the outdoor heat exchanger 2 is greater than or equal to the second preset temperature. The second preset temperature is greater than the first preset temperature. For specific functions and processes of the control unit 104, see step S630.

[0199] The control unit 104 is further configured to, after controlling the air conditioner to enter a preset defrost mode, if the desired defrost condition is met, control the air conditioner to exit the preset defrost mode, turn on either the first fan or the second fan, and re-enter the air conditioner's heating mode; conversely, if the desired defrost condition is not met after controlling the air conditioner to enter the preset defrost mode, defrosting of the outdoor heat exchanger 2 will continue. The specific functions and processing of this control unit 104 are further described in step S640.

[0200] Figure 13 This is a schematic diagram illustrating the control logic for starting and stopping the defrosting process of an air conditioner. Figure 14 In the example shown, the specific methods for determining whether the temperature of the outdoor heat exchanger 2 meets the defrosting conditions in steps 16, 19, and 21 can be found in [reference needed]. Figure 13 The example shown. For example... Figure 13 As shown, the control logic for the defrosting start and stop of the air conditioner includes:

[0201] Step 31: During the heating operation, determine whether the difference between the outer ring temperature Tw and the current windward temperature Ty, and the difference between the outer ring temperature Tw and the current leeward temperature Tb, simultaneously satisfy the condition of being greater than or equal to the first preset temperature. If yes, determine that both sides of the outdoor heat exchanger 2 are frosted, and execute step 32 to activate the defrosting mode; otherwise, continue to control the air conditioner to operate in heating mode.

[0202] In step 31, alternating the operation of the two fans can only delay frost formation. However, if both sides of the outdoor heat exchanger 2 are frosted, it is necessary to detect the actual windward and leeward temperatures to determine whether to shut down and enter defrosting mode. For example, if the current windward temperature Ty is -8℃, the current leeward temperature Tb is -7℃, the outer ring temperature Tw is 0℃, and the first preset temperature is 6℃, then the temperature difference between the two sides of the outdoor heat exchanger 2 and the outer ring temperature Tw is 8℃ and 7℃ respectively, both of which are greater than the first preset temperature. Therefore, it is determined that both sides of the outdoor heat exchanger 2 are frosted, and defrosting mode is activated.

[0203] Step 32: Activate the defrosting mode to defrost the outdoor heat exchanger 2, and then proceed to step 33.

[0204] Step 33: When the current temperature Ty on the windward side and the current temperature Tb on the leeward side are both greater than or equal to the second preset temperature and maintained for the first preset duration, it is determined that the outdoor heat exchanger 2 has completed defrosting, and then step 34 is executed. For example: the first preset duration is 8 seconds, the second preset temperature is 10°C, and the temperature on both sides of the outdoor heat exchanger 2 is detected to be higher than 10°C and maintained for 8 seconds, it is determined that the defrosting exit condition is met, and the air conditioner is controlled to stop defrosting.

[0205] Step 34: After the air conditioner defrosts, you can turn on any fan to re-enter the heating mode.

[0206] The scheme of the present application is to optimize the start-stop of the double-fan outdoor unit according to the system parameter change, to optimize the heating and defrosting control; to monitor the current change and operation time of the one-side fan of the double-fan outdoor unit during the heating process, and the starting current of the other-side fan, to determine the minimum time interval for replacing the fan, to optimize the starting mode of the double fan, to extend the heating time as much as possible, and to avoid frequent defrosting.

[0207] In some embodiments, the control unit 104 corrects the time interval of the first fan and the second fan alternately starting, in combination with the current of the first fan and the operation time of the first fan, and the current of the second fan and the operation time of the second fan, including at least one of the following correction processes: the first correction process and the second correction process.

[0208] The first correction process:

[0209] The control unit 104 is specifically further configured to, in one cycle, record the current of the first fan when the first side of the outdoor heat exchanger 2 is frosting as the first current of the first fan (such as the current of the first fan I 11 ), record the operation time of the second fan when the outdoor heat exchanger 2 does not meet the preset defrosting condition for the first time as the starting time of the second fan (such as the total starting time of the second fan t2), record the current of the second fan as the first current of the second fan (such as the current of the second fan I 21 ), and record the current of the first fan when the first fan is controlled to start again as the second current of the first fan (such as the current of the first fan when starting again I 12 ). The specific functions and processes of the control unit 104 also refer to step S710.

[0210] The control unit 104 is specifically further configured to determine the difference between the first current of the second fan and the second current of the first fan, determine the ratio of the difference to the difference between the first current of the first fan and the second current of the first fan, and determine the product value of the ratio and the starting time of the second fan as the minimum operation time interval of the first fan after starting again after correction, to obtain the time interval of the first fan and the second fan alternately starting after correction; wherein the minimum operation time interval of the first fan after starting again after correction is, for example, the minimum replacement time interval of the first fan (such as the minimum time interval t gm1 ). The specific functions and processes of the control unit 104 also refer to step S720.

[0211] Specifically, as Figure 14As shown, the control logic of the outdoor unit of the air conditioner, in which the first fan and the second fan are alternately operated, further comprises: in step 18, predicting the minimum time interval t of the first fan running again after being turned on gm1 , t gm1 = (I 21 -I 12 ) / (I 11 -I 12 )*t2. Wherein, I 21 is the current of the second fan when the first fan is turned on, the second fan is turned off, the first windward surface 11 is judged to be frosted, and the second windward surface 12 is judged to be frosted after switching to the first fan being turned off and the second fan being turned on, but does not meet the defrosting condition. I 11 is the current of the first fan when the first fan is turned on, the second fan is turned off, and the first windward surface 11 is judged to be frosted. t2 is the total running time of the second fan when the first fan is turned on, the second fan is turned off, the first windward surface 11 is judged to be frosted, and the second windward surface 12 is judged to be frosted after switching to the first fan being turned off and the second fan being turned on, but does not meet the defrosting condition. 12 is the current of the first fan when the first fan is turned on, the second fan is turned off, the first windward surface 11 is judged to be frosted, and the second windward surface 12 is judged to be frosted after switching to the first fan being turned off and the second fan being turned on, but does not meet the defrosting condition, the second fan is turned off, and the first fan is turned on again.

[0212] In the scheme of the present application, by correcting the minimum running time interval of the first fan after being turned on again, the operation of the first fan and the opening of the defrosting mode can be better controlled, the starting mode of the double fan is optimized, the heating time is as long as possible, frequent defrosting is avoided, precise defrosting is realized, the heating effect is improved, and the indoor comfort is improved.

[0213] The second correction process:

[0214] The control unit 104 is specifically further configured to record the current of the first fan when the first face of the outdoor heat exchanger 2 is frosted as the first current of the first fan (such as the current I 11 of the first fan) in one cycle, record the current of the second fan when the outdoor heat exchanger 2 does not meet the preset defrosting condition for the first time as the first current of the second fan (such as the current I 21 of the second fan), and record the running time of the first fan when the outdoor heat exchanger 2 does not meet the preset defrosting condition for the second time as the opening time of the first fan (such as the opening time t1 of the first fan), and record the current of the first fan as the third current of the first fan (such as the current I 31The current of the second fan when it restarts is recorded as the second current of the second fan (e.g., the current of the second fan is I). 22 For details on the specific functions and processing of the control unit 104, please refer to step S810.

[0215] The control unit 104 is further configured to determine the difference between the third current of the first fan and the second current of the second fan, determine the ratio of this difference to the difference between the first current and the second current of the second fan, and determine the product of this ratio and the start-up time of the first fan, as the minimum operating time interval after the second fan restarts, to obtain the corrected time interval for the alternating start-up of the first and second fans. The corrected minimum operating time interval after the second fan restarts may be, for example, the minimum replacement time interval of the second fan (e.g., minimum time interval t). gm2 For details on the specific functions and processing of the control unit 104, please refer to step S820.

[0216] Specifically, such as Figure 14 As shown, the control logic for the alternating operation of the first and second fans in the outdoor unit of the air conditioner further includes, in step 20, predicting the minimum time interval t between the second fan restarting and the need to replace the fan. gm2 =(I 31 -I 22 ) / (I 21 -I 22 )*t1. Where, I 31 The minimum time interval t required to replace the fan after the first fan is restarted. gm1 Then, determine the current of the first fan when the outdoor heat exchanger 2 does not meet the defrosting conditions. 21 To determine if the first windward surface 11 is frosted when the first fan is on and the second fan is off, and to determine the current of the second fan when the first fan is off and the second fan is on, and the second fan is frosted on the second windward surface 12 but the defrosting condition is not met, I... 22 The minimum time interval t required to replace the fan after the first fan is restarted. gm1 Then, when it is determined that the outdoor heat exchanger 2 does not meet the defrosting conditions, the first fan is shut down and restarted, and the second fan is restarted, the current of the second fan is calculated. t1 is the minimum time interval t required to replace the fan after the first fan restarts. gm1 Then, determine the running time of the first fan after it restarts when the outdoor heat exchanger 2 does not meet the defrosting conditions.

[0217] In the scheme of the present application, by revising the minimum running time interval after the second fan is turned on again, the operation of the second fan and the start of the defrosting mode can be better controlled, the starting mode of the double fan is optimized, the heating time is as long as possible, frequent defrosting is avoided, precise defrosting is realized, the heating effect is improved, and the indoor comfort is improved.

[0218] Since the processing and functions realized by the device of the present embodiment are basically corresponding to the foregoing embodiments, principles and examples of the method, the description of the present embodiment will not be elaborated on the related descriptions in the foregoing embodiments, which will not be repeated here.

[0219] According to the embodiments of the present application, an air conditioner corresponding to the control device of the air conditioner is also provided. The air conditioner can include the control device of the air conditioner described above.

[0220] Since the processing and functions realized by the air conditioner of the present embodiment are basically corresponding to the foregoing embodiments, principles and examples of the device, the description of the present embodiment will not be elaborated on the related descriptions in the foregoing embodiments, which will not be repeated here.

[0221] According to the embodiments of the present application, a computer program product corresponding to the air conditioner is also provided, which includes a computer program, and the computer program is executed by a processor to realize the steps of the control method of the air conditioner described above.

[0222] Since the processing and functions realized by the product of the present embodiment are basically corresponding to the foregoing embodiments, principles and examples of the air conditioner, the description of the present embodiment will not be elaborated on the related descriptions in the foregoing embodiments, which will not be repeated here.

[0223] According to the embodiments of the present application, a storage medium corresponding to the control method of the air conditioner is also provided, which includes a stored program, and when the program is running, the device where the storage medium is located executes the steps of the control method of the air conditioner described above.

[0224] Since the processing and functions realized by the storage medium of the present embodiment are basically corresponding to the foregoing embodiments, principles and examples of the method, the description of the present embodiment will not be elaborated on the related descriptions in the foregoing embodiments, which will not be repeated here.

[0225] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0226] The above only describes the embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control method of an air conditioner, characterized by, The outdoor unit of the air conditioner has an outdoor heat exchanger (2), an outdoor fan, an outdoor air inlet and a shielding device; The outdoor fan comprises a first fan arranged in a first fan cavity (1) and a second fan arranged in a second fan cavity (3), the first fan cavity (1) is located at a first surface of the outdoor heat exchanger (2), and the second fan cavity (3) is located at a second surface of the outdoor heat exchanger (2); the outdoor air inlet comprises a first air inlet (9) and a second air inlet (10), and the shielding device can shield any one of the first air inlet (9) and the second air inlet (10); and the control method of the air conditioner comprises: After the air conditioner starts the heating mode, the first fan is controlled to be turned on, the second fan is controlled to be turned off, and the shielding device is controlled to shield the second air inlet (10), so that the first air inlet (9) and the first air inlet cavity (1) form an air path; In the case that the air conditioner operates in the heating mode, the outdoor environment temperature of the air conditioner is acquired, the surface temperature of the first surface of the outdoor heat exchanger (2) is acquired, the surface temperature of the second surface of the outdoor heat exchanger (2) is acquired, the current of the first fan and the operation time of the first fan are acquired, and the current of the second fan and the operation time of the second fan are acquired; In combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger (2) and the surface temperature of the second surface of the outdoor heat exchanger (2), the first fan and the second fan are controlled to be alternately turned on, and the outdoor heat exchanger (2) is controlled to be defrosted; In the process of controlling the first fan and the second fan to be alternately turned on, and / or after controlling the outdoor heat exchanger (2) to be defrosted, in combination with the current of the first fan and the operation time of the first fan, and the current of the second fan and the operation time of the second fan, the time interval of the first fan and the second fan being alternately turned on is corrected, and the first fan and the second fan are controlled to be alternately turned on according to the corrected time interval of the first fan and the second fan being alternately turned on.

2. The control method of the air conditioner according to claim 1, characterized by, In combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger (2) and the surface temperature of the second surface of the outdoor heat exchanger (2), the first fan and the second fan are controlled to be alternately turned on, and the outdoor heat exchanger (2) is controlled to be defrosted, comprising: In the case that the first fan is turned on, the second fan is turned off, and the shielding device shields the second air inlet (10), it is determined whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger (2) is greater than or equal to a first preset temperature; If it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger (2) is less than the first preset temperature, the first fan is maintained to be turned on, the second fan is maintained to be turned off, and the shielding device is maintained to shield the second air inlet (10); If it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the first surface of the outdoor heat exchanger (2) is greater than or equal to a first preset temperature, it is determined that the first surface of the outdoor heat exchanger (2) is frosted, the first fan is controlled to be closed, the second fan is controlled to be opened, and the shielding device is controlled to shield the first air inlet (9) so that the second air inlet (10) and the second air inlet cavity (3) form an air path; at this time, the first fan and the second fan are alternately opened for the first time.

3. The control method of the air conditioner according to claim 1 or 2, characterized by, In combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger (2), and the surface temperature of the second surface of the outdoor heat exchanger (2), the first fan and the second fan are alternately opened, and the outdoor heat exchanger (2) is defrosted, further comprising: In the case that the first fan is closed, the second fan is opened, and the shielding device shields the first air inlet (9), it is determined whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger (2) is greater than or equal to a first preset temperature; If it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger (2) is less than the first preset temperature, the first fan is maintained to be closed, the second fan is maintained to be opened, and the shielding device is maintained to shield the first air inlet (9); If it is determined that the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the second surface of the outdoor heat exchanger (2) is greater than or equal to the first preset temperature, it is first determined whether the outdoor heat exchanger (2) meets a preset defrosting condition; If it is first determined that the outdoor heat exchanger (2) meets the preset defrosting condition, the air conditioner is controlled to stop running in a heating mode, and the air conditioner is controlled to enter a preset defrosting mode to defrost the outdoor heat exchanger (2); If it is first determined that the outdoor heat exchanger (2) does not meet the preset defrosting condition, the second fan is controlled to be closed, the first fan is controlled to be opened again, and the shielding device is controlled to shield the second air inlet (10) so that the first air inlet (9) and the first air inlet cavity (1) form an air path; at this time, the first fan and the second fan are alternately opened for the second time.

4. The control method of the air conditioner according to claim 1 or 2, characterized by, In combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger (2), and the surface temperature of the second surface of the outdoor heat exchanger (2), the first fan and the second fan are alternately opened, and the outdoor heat exchanger (2) is defrosted, further comprising: In the case that the second fan is closed, the first fan is opened again, and the shielding device shields the second air inlet (10), in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, the time interval of the first fan and the second fan alternately opening is corrected to obtain a corrected minimum running time interval of the first fan after being opened again as a corrected time interval of the first fan and the second fan alternately opening; controlling the first fan to run for the minimum running time interval after the first fan is turned on again according to the corrected minimum running time interval after the first fan is turned on again, and then secondly determining whether the outdoor heat exchanger (2) meets the preset defrosting condition; if the outdoor heat exchanger (2) is secondly determined to meet the preset defrosting condition, controlling the air conditioner to stop running in the heating mode, and controlling the air conditioner to enter the preset defrosting mode to defrost the outdoor heat exchanger (2); if the outdoor heat exchanger (2) is secondly determined not to meet the preset defrosting condition, controlling the first fan to be turned off, controlling the second fan to be turned on again, and controlling the shielding device to shield the first air inlet (9) so that the second air inlet (10) forms an air path with the first air inlet cavity (3); thus, the third alternating turning on of the first fan and the second fan is realized.

5. The control method of the air conditioner according to claim 3, characterized by, controlling the first fan and the second fan to be alternately turned on and controlling the outdoor heat exchanger (2) to be defrosted in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first face of the outdoor heat exchanger (2), and the surface temperature of the second face of the outdoor heat exchanger (2), further comprising: in the case that the second fan is turned off, the first fan is turned on again, and the shielding device shields the second air inlet (10), correcting the time interval of the alternating turning on of the first fan and the second fan in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, to obtain the minimum running time interval after the first fan is turned on again as the corrected time interval of the alternating turning on of the first fan and the second fan; controlling the first fan to run for the minimum running time interval after the first fan is turned on again according to the corrected minimum running time interval after the first fan is turned on again, and then secondly determining whether the outdoor heat exchanger (2) meets the preset defrosting condition; if the outdoor heat exchanger (2) is secondly determined to meet the preset defrosting condition, controlling the air conditioner to stop running in the heating mode, and controlling the air conditioner to enter the preset defrosting mode to defrost the outdoor heat exchanger (2); if the outdoor heat exchanger (2) is secondly determined not to meet the preset defrosting condition, controlling the first fan to be turned off, controlling the second fan to be turned on again, and controlling the shielding device to shield the first air inlet (9) so that the second air inlet (10) forms an air path with the first air inlet cavity (3); thus, the third alternating turning on of the first fan and the second fan is realized.

6. The control method of the air conditioner according to any one of claims 1, 2, 5, characterized by, controlling the first fan and the second fan to be alternately turned on and controlling the outdoor heat exchanger (2) to be defrosted in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first face of the outdoor heat exchanger (2), and the surface temperature of the second face of the outdoor heat exchanger (2), further comprising: In the case that the first fan is closed, the second fan is opened again, and the shielding device shields the first air inlet (9), the time interval of the first fan and the second fan opening alternately is corrected in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, so as to obtain the corrected minimum running time interval of the second fan after being opened again as the corrected time interval of the first fan and the second fan opening alternately; The second fan is controlled to run according to the corrected minimum running time interval of the second fan after being opened again, and then it is determined for the third time whether the outdoor heat exchanger (2) meets the preset defrosting condition; If it is determined for the third time that the outdoor heat exchanger (2) meets the preset defrosting condition, the air conditioner is controlled to stop running in the heating mode, and the air conditioner is controlled to enter the preset defrosting mode to defrost the outdoor heat exchanger (2); If it is determined for the third time that the outdoor heat exchanger (2) does not meet the preset defrosting condition, it is returned to control the first fan to be opened, the second fan to be closed, and the shielding device to shield the second air inlet (10), and the cycle is repeated.

7. The control method of the air conditioner according to claim 3, characterized by, In combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first face of the outdoor heat exchanger (2), and the surface temperature of the second face of the outdoor heat exchanger (2), the first fan and the second fan are controlled to open alternately, and the outdoor heat exchanger (2) is controlled to defrost, and further comprising: In the case that the first fan is closed, the second fan is opened again, and the shielding device shields the first air inlet (9), the time interval of the first fan and the second fan opening alternately is corrected in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, so as to obtain the corrected minimum running time interval of the second fan after being opened again as the corrected time interval of the first fan and the second fan opening alternately; The second fan is controlled to run according to the corrected minimum running time interval of the second fan after being opened again, and then it is determined for the third time whether the outdoor heat exchanger (2) meets the preset defrosting condition; If it is determined for the third time that the outdoor heat exchanger (2) meets the preset defrosting condition, the air conditioner is controlled to stop running in the heating mode, and the air conditioner is controlled to enter the preset defrosting mode to defrost the outdoor heat exchanger (2); If it is determined for the third time that the outdoor heat exchanger (2) does not meet the preset defrosting condition, it is returned to control the first fan to be opened, the second fan to be closed, and the shielding device to shield the second air inlet (10), and the cycle is repeated.

8. The control method of the air conditioner according to claim 4, characterized by, In combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first face of the outdoor heat exchanger (2), and the surface temperature of the second face of the outdoor heat exchanger (2), the first fan and the second fan are controlled to open alternately, and the outdoor heat exchanger (2) is controlled to defrost, and further comprising: In the case that the first fan is closed, the second fan is opened again, and the shielding device shields the first air inlet (9), the time interval of the first fan and the second fan being opened alternately is corrected in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, to obtain a corrected minimum running time interval of the second fan after being opened again as the corrected time interval of the first fan and the second fan being opened alternately; The second fan is controlled to run for the corrected minimum running time interval of the second fan after being opened again, and then it is determined for the third time whether the outdoor heat exchanger (2) meets the preset defrosting condition; If it is determined for the third time that the outdoor heat exchanger (2) meets the preset defrosting condition, the air conditioner is controlled to stop running in the heating mode, and the air conditioner is controlled to enter the preset defrosting mode to defrost the outdoor heat exchanger (2); If it is determined for the third time that the outdoor heat exchanger (2) does not meet the preset defrosting condition, the first fan is re-controlled to be opened, the second fan is controlled to be closed, and the shielding device is controlled to shield the second air inlet (10), so as to circulate.

9. The control method of the air conditioner according to any one of claims 1, 2, 5, 7, 8, characterized by, Wherein, The defrosting of the outdoor heat exchanger (2) includes: In the case that it is necessary to determine whether the outdoor heat exchanger (2) meets the preset defrosting condition, it is determined whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current windward surface of the outdoor heat exchanger (2) is greater than or equal to a first preset temperature, and the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current leeward surface of the outdoor heat exchanger (2) is greater than or equal to the first preset temperature; wherein the current windward surface of the outdoor heat exchanger (2) is one of the first surface and the second surface of the outdoor heat exchanger (2); and the current leeward surface of the outdoor heat exchanger (2) is the other of the first surface and the second surface of the outdoor heat exchanger (2); If it is determined to meet, it is determined that the outdoor heat exchanger (2) meets the preset defrosting condition, so as to control the air conditioner to stop running in the heating mode, and control the air conditioner to enter the preset defrosting mode to defrost the outdoor heat exchanger (2); After the air conditioner is controlled to enter the preset defrosting mode, it is determined whether the surface temperature of the current windward surface of the outdoor heat exchanger (2) is greater than or equal to a second preset temperature, and the surface temperature of the current leeward surface of the outdoor heat exchanger (2) is greater than or equal to the second preset temperature; wherein the second preset temperature is greater than the first preset temperature; If it is determined to meet, the air conditioner is controlled to exit the preset defrosting mode, any one of the first fan and the second fan is opened, and the heating mode of the air conditioner is re-entered; And / or, The correction of the time interval of the first fan and the second fan being opened alternately in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan includes at least one of the following correction processes: The first correction process: In a cycle, the current of the first fan when the first face of the outdoor heat exchanger (2) is frosting is recorded as the first current of the first fan, the running time of the second fan when the outdoor heat exchanger (2) is determined for the first time to not meet the preset defrosting condition is recorded as the opening time of the second fan, the current of the second fan is recorded as the first current of the second fan, and the current of the first fan when the first fan is controlled to be opened again is recorded as the second current of the first fan; The difference between the first current of the second fan and the second current of the first fan is determined, the ratio of the difference to the difference between the first current of the first fan and the second current of the first fan is determined, and the product of the ratio and the opening time of the second fan is determined as the minimum running time interval after the first fan is opened again, so as to obtain the time interval of the first fan and the second fan after being opened alternately. The second correction process is as follows: In a cycle, the current of the first fan when the first face of the outdoor heat exchanger (2) is frosting is recorded as the first current of the first fan, the current of the second fan when the outdoor heat exchanger (2) is determined for the first time to not meet the preset defrosting condition is recorded as the first current of the second fan, the running time of the first fan when the outdoor heat exchanger (2) is determined for the second time to not meet the preset defrosting condition is recorded as the opening time of the first fan, the current of the first fan is recorded as the third current of the first fan, and the current of the second fan when the second fan is controlled to be opened again is recorded as the second current of the second fan. The difference between the third current of the first fan and the second current of the second fan is determined, the ratio of the difference to the difference between the first current of the second fan and the second current of the second fan is determined, and the product of the ratio and the opening time of the first fan is determined as the minimum running time interval after the second fan is opened again, so as to obtain the time interval of the first fan and the second fan after being opened alternately.

10. The control method of the air conditioner according to claim 3, characterized by, Wherein, The defrosting of the outdoor heat exchanger (2) is controlled, comprising: In the case of needing to determine whether the outdoor heat exchanger (2) meets the preset defrosting condition, it is determined whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current windward face of the outdoor heat exchanger (2) is greater than or equal to a first preset temperature, and whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current leeward face of the outdoor heat exchanger (2) is greater than or equal to a first preset temperature; wherein the current windward face of the outdoor heat exchanger (2) is one of the first face and the second face of the outdoor heat exchanger (2); and the current leeward face of the outdoor heat exchanger (2) is the other of the first face and the second face of the outdoor heat exchanger (2). If it is determined that the condition is met, it is determined that the outdoor heat exchanger (2) meets the preset defrosting condition, and the air conditioner is controlled to stop running in the heating mode and enter a preset defrosting mode to defrost the outdoor heat exchanger (2); After the air conditioner enters the preset defrosting mode, it is determined whether the current windward surface temperature of the outdoor heat exchanger (2) is greater than or equal to a second preset temperature, and the current leeward surface temperature of the outdoor heat exchanger (2) is greater than or equal to the second preset temperature; wherein the second preset temperature is greater than the first preset temperature; If it is determined that the condition is met, the air conditioner is controlled to exit the preset defrosting mode, start any one of the first fan and the second fan, and re-enter the heating mode of the air conditioner; And / or, In combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, the time interval of the first fan and the second fan alternately starting is corrected, including at least one of the following correction processes: The first correction process: In a cycle period, the current of the first fan when the first surface of the outdoor heat exchanger (2) is determined to be frosted is recorded as the first current of the first fan, the running time of the second fan when the outdoor heat exchanger (2) is determined for the first time to not meet the preset defrosting condition is recorded as the starting time of the second fan, the current of the second fan is recorded as the first current of the second fan, and the current of the first fan when the first fan is controlled to start again is recorded as the second current of the first fan; The difference between the first current of the second fan and the second current of the first fan is determined, the ratio of the difference to the difference between the first current of the first fan and the second current of the first fan is determined, and the product of the ratio and the starting time of the second fan is determined as the minimum running time interval after the first fan is started again, to obtain the corrected time interval of the first fan and the second fan alternately starting; The second correction process: In a cycle period, the current of the first fan when the first surface of the outdoor heat exchanger (2) is determined to be frosted is recorded as the first current of the first fan, the current of the second fan when the outdoor heat exchanger (2) is determined for the first time to not meet the preset defrosting condition is recorded as the first current of the second fan, the running time of the first fan when the outdoor heat exchanger (2) is determined for the second time to not meet the preset defrosting condition is recorded as the starting time of the first fan, the current of the first fan is recorded as the third current of the first fan, and the current of the second fan when the second fan is controlled to start again is recorded as the second current of the second fan; Determine the difference between the third current of the first fan and the second current of the second fan, determine the ratio of the difference to the difference between the first current of the second fan and the second current of the second fan, and determine the product of the ratio and the opening time of the first fan as the minimum running time interval after the second fan is opened again, so as to obtain the corrected time interval of the first fan and the second fan alternately opening. 11.The control method of the air conditioner according to claim 4, characterized by, Wherein, Control defrosting of the outdoor heat exchanger (2), comprising: In the case of needing to determine whether the outdoor heat exchanger (2) meets the preset defrosting condition, it is determined whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current windward surface of the outdoor heat exchanger (2) is greater than or equal to a first preset temperature, and the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current leeward surface of the outdoor heat exchanger (2) is greater than or equal to a first preset temperature; wherein the current windward surface of the outdoor heat exchanger (2) is one of the first surface and the second surface of the outdoor heat exchanger (2); the current leeward surface of the outdoor heat exchanger (2) is the other of the first surface and the second surface of the outdoor heat exchanger (2); If it is determined to meet, it is determined that the outdoor heat exchanger (2) meets the preset defrosting condition, so as to control the air conditioner to stop running in heating mode and control the air conditioner to enter the preset defrosting mode to defrost the outdoor heat exchanger (2); After controlling the air conditioner to enter the preset defrosting mode, it is determined whether the surface temperature of the current windward surface of the outdoor heat exchanger (2) is greater than or equal to a second preset temperature, and the surface temperature of the current leeward surface of the outdoor heat exchanger (2) is greater than or equal to a second preset temperature; wherein the second preset temperature is greater than the first preset temperature; If it is determined to meet, control the air conditioner to exit the preset defrosting mode, start any one of the first fan and the second fan, and re-enter the heating mode of the air conditioner; And / or, In combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, correct the time interval of the first fan and the second fan alternately opening, including at least one of the following correction processes: The first correction process: In a cycle period, the current of the first fan when the first surface of the outdoor heat exchanger (2) is frosting is recorded as the first current of the first fan, the running time of the second fan when the outdoor heat exchanger (2) is determined to not meet the preset defrosting condition is recorded as the opening time of the second fan, the current of the second fan is recorded as the first current of the second fan, and the current of the first fan when the first fan is controlled to be opened again is recorded as the second current of the first fan; determining a difference between the first current of the second fan and the second current of the first fan, determining a ratio of the difference to a difference between the first current of the second fan and the second current of the first fan, and determining a product of the ratio and the on-time of the first fan as a minimum running time interval after the second fan is turned on again, to obtain a modified time interval for the first fan and the second fan to be turned on alternately. The second modification process includes: In one cycle, the current of the first fan when the first face of the outdoor heat exchanger (2) is frosted is recorded as the first current of the first fan, the current of the second fan when the outdoor heat exchanger (2) is determined for the first time not to meet the preset defrosting condition is recorded as the first current of the second fan, the running time of the first fan when the outdoor heat exchanger (2) is determined for the second time not to meet the preset defrosting condition is recorded as the on-time of the first fan, the current of the first fan is recorded as the third current of the first fan, and the current of the second fan when the second fan is turned on again is recorded as the second current of the second fan. determining a difference between the third current of the first fan and the second current of the second fan, determining a ratio of the difference to a difference between the first current of the second fan and the second current of the second fan, and determining a product of the ratio and the on-time of the first fan as a minimum running time interval after the second fan is turned on again, to obtain a modified time interval for the first fan and the second fan to be turned on alternately. 12.The control method of the air conditioner according to claim 6, characterized by, In the control method, the defrosting of the outdoor heat exchanger (2) includes: In a case where it is necessary to determine whether the outdoor heat exchanger (2) meets the preset defrosting condition, it is determined whether the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current windward face of the outdoor heat exchanger (2) is greater than or equal to a first preset temperature, and the difference between the outdoor environment temperature of the air conditioner and the surface temperature of the current leeward face of the outdoor heat exchanger (2) is greater than or equal to the first preset temperature; wherein the current windward face of the outdoor heat exchanger (2) is one of the first face and the second face of the outdoor heat exchanger (2); and the current leeward face of the outdoor heat exchanger (2) is the other of the first face and the second face of the outdoor heat exchanger (2). If it is determined that the condition is met, it is determined that the outdoor heat exchanger (2) meets the preset defrosting condition, so that the air conditioner is controlled to stop running in the heating mode and enter the preset defrosting mode to defrost the outdoor heat exchanger (2). After the air conditioner is controlled to enter the preset defrosting mode, it is determined whether the surface temperature of the current windward face of the outdoor heat exchanger (2) is greater than or equal to a second preset temperature, and the surface temperature of the current leeward face of the outdoor heat exchanger (2) is greater than or equal to the second preset temperature; wherein the second preset temperature is greater than the first preset temperature. If it is determined that the preset defrosting condition is met, the air conditioner is controlled to exit the preset defrosting mode, to start any one of the first fan and the second fan, and to re-enter the heating mode of the air conditioner; and / or, The time interval of the first fan and the second fan being alternately started is corrected in combination with the current of the first fan and the running time of the first fan, and the current of the second fan and the running time of the second fan, including at least one of the following correction processes: The first correction process: In a cycle period, the current of the first fan when the first side of the outdoor heat exchanger (2) is frosted is recorded as the first current of the first fan, the running time of the second fan when the outdoor heat exchanger (2) is determined for the first time to not meet the preset defrosting condition is recorded as the starting time of the second fan, the current of the second fan is recorded as the first current of the second fan, and the current of the first fan when the first fan is controlled to be started again is recorded as the second current of the first fan; The product value of the difference between the first current of the second fan and the second current of the first fan, the ratio of the difference to the first current of the first fan and the second current of the first fan, and the starting time of the second fan is determined as the minimum running time interval after the second fan is started again, so as to obtain the corrected time interval of the first fan and the second fan being alternately started. The second correction process: In a cycle period, the current of the first fan when the first side of the outdoor heat exchanger (2) is frosted is recorded as the first current of the first fan, the current of the second fan when the outdoor heat exchanger (2) is determined for the first time to not meet the preset defrosting condition is recorded as the first current of the second fan, the running time of the first fan when the outdoor heat exchanger (2) is determined for the second time to not meet the preset defrosting condition is recorded as the starting time of the first fan, the current of the first fan is recorded as the third current of the first fan, and the current of the second fan when the second fan is controlled to be started again is recorded as the second current of the second fan; The product value of the difference between the third current of the first fan and the second current of the second fan, the ratio of the difference to the first current of the second fan and the second current of the second fan, and the starting time of the first fan is determined as the minimum running time interval after the first fan is started again, so as to obtain the corrected time interval of the first fan and the second fan being alternately started.

13. A control device of an air conditioner, characterized by comprising: The outdoor unit of the air conditioner has an outdoor heat exchanger (2), an outdoor fan, an outdoor air inlet, and a shielding device. The outdoor fan comprises a first fan arranged in a first fan cavity (1) and a second fan arranged in a second fan cavity (3), the first fan cavity (1) is located at a first surface of the outdoor heat exchanger (2), and the second fan cavity (3) is located at a second surface of the outdoor heat exchanger (2); the outdoor air inlet comprises a first air inlet (9) and a second air inlet (10), and the shielding device can shield any one of the first air inlet (9) and the second air inlet (10); and the control device of the air conditioner comprises: a control unit configured to control the first fan to be turned on, control the second fan to be turned off, and control the shielding device to shield the second air inlet (10) after the air conditioner is turned on in the heating mode, so that the first air inlet (9) forms an air path with the first air inlet cavity (1); a obtaining unit configured to obtain the outdoor environment temperature of the air conditioner, obtain the surface temperature of the first surface of the outdoor heat exchanger (2), obtain the surface temperature of the second surface of the outdoor heat exchanger (2), obtain the current of the first fan and the operation time of the first fan, and obtain the current of the second fan and the operation time of the second fan when the air conditioner is running in the heating mode; the control unit is further configured to control the first fan and the second fan to be alternately turned on in combination with the outdoor environment temperature of the air conditioner, the surface temperature of the first surface of the outdoor heat exchanger (2), and the surface temperature of the second surface of the outdoor heat exchanger (2), and control the outdoor heat exchanger (2) to defrost; wherein, the control unit is further configured to correct the time interval of the first fan and the second fan being alternately turned on in combination with the current of the first fan and the operation time of the first fan, and the current of the second fan and the operation time of the second fan during the process of controlling the first fan and the second fan to be alternately turned on, and / or after controlling the outdoor heat exchanger (2) to defrost, and control the first fan and the second fan to be alternately turned on according to the corrected time interval of the first fan and the second fan being alternately turned on.

14. An air conditioner characterized by comprising: comprise The control device of the air conditioner according to claim 13.

15. A storage medium, characterized by The storage medium comprises a stored program, wherein the device where the storage medium is located executes the control method of the air conditioner according to any one of claims 1 to 12 when the program is running.

16. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the control method of the air conditioner according to any one of claims 1 to 12.

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