An air conditioner and a control method, device and readable storage medium thereof

Abstract

The application provides an air conditioner and a control method, device and readable storage medium thereof. The air conditioner comprises at least one outdoor fan, and the control method comprises the following steps: acquiring a compressor frequency, an outdoor fan rotating speed and a high-pressure pressure; in a refrigeration mode or a dehumidification mode, when the compressor frequency reaches a first threshold value, the outdoor fan rotating speed reaches a second threshold value, and a duration reaches a first time threshold value, the air conditioner is controlled to enter a target control mode; wherein, in the target control mode, the rotating direction and the rotating speed of the outdoor fan are controlled according to the high-pressure pressure. The application solves the problem that the technical solution in the related art cannot avoid the frequent start and stop of the outdoor fan when the refrigeration mode is operated at a low ambient temperature.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioner and its control method, apparatus and readable storage medium. Background Technology

[0002] Currently, air conditioner usage scenarios are becoming increasingly complex. When operating in cooling mode at low ambient temperatures, due to the low external ambient temperature and low load demand, air conditioners are prone to liquid return or indoor unit frost buildup. To ensure the reliability of unit operation, the common practice is to reduce the compressor operating frequency and outdoor fan speed. However, due to reliability limitations of compressor and outdoor fan drive control, the minimum operating frequency of the compressor and the fan speed cannot be reduced indefinitely; there are minimum operating frequencies and minimum fan speeds. If the reliability requirements are still not met when both the compressor frequency and outdoor fan speed are reduced to their minimum, the outdoor fans will be shut down sequentially. When all outdoor fans stop, the outdoor heat exchanger cannot effectively exchange heat with the external environment, causing the outdoor high pressure to rise rapidly. At this point, the outdoor fans must be turned on again to ensure reliability, and this cycle repeats itself.

[0003] In the existing technology, to solve this problem, reducing the minimum outdoor fan speed will increase the difficulty of drive control and development; reducing the size of the outdoor fan blades will not meet the air volume requirements under high temperature conditions; and frequent start-stop of the outdoor fan will cause the unit to be unable to operate stably, generate noise, and result in uneven airflow from the indoor unit, causing fluctuations in indoor temperature, which will affect the user experience and the reliability of the unit operation.

[0004] Therefore, it can be seen that the problem with the relevant technology is that the technical solution in the relevant technology cannot avoid the frequent start and stop of the outdoor fan when operating the cooling mode at low ambient temperatures. Summary of the Invention

[0005] The problem solved by this invention is that the technical solutions in related technologies cannot avoid frequent start-stop of the outdoor fan when operating in cooling mode at low ambient temperatures.

[0006] To address the aforementioned problems, the primary objective of this invention is to provide a control method for an air conditioner.

[0007] A second objective of the present invention is to provide a control device for an air conditioner.

[0008] A third objective of this invention is to provide an air conditioner.

[0009] A fourth objective of this invention is to provide a readable storage medium.

[0010] To achieve the first objective of this invention, embodiments of this invention provide a control method for an air conditioner, the air conditioner including at least one outdoor fan, the control method including:

[0011] S100: Obtains compressor frequency, outdoor fan speed, and high pressure;

[0012] S200: In cooling or dehumidifying mode, when the compressor frequency reaches the first threshold, the outdoor fan speed reaches the second threshold, and the duration reaches the first time threshold, the air conditioner is controlled to enter the target control mode.

[0013] In target control mode, the rotation direction and speed of the outdoor fan are controlled according to the high pressure.

[0014] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: The solution of this embodiment can reduce the effective air volume and heat exchange by controlling the forward and reverse rotation of the outdoor fan according to the unit operating pressure, outdoor fan speed and compressor operating frequency, without affecting the reliability of outdoor unit operation (without changing the minimum compressor frequency and the minimum outdoor fan speed), find the heat exchange balance point of the unit as much as possible, avoid frequent start-up of the outdoor fan or reduce the frequency of start-up and shutdown, so that the unit can operate stably, improve the reliability of unit operation and user comfort.

[0015] In one embodiment of the present invention, the air conditioner includes an outdoor fan, and the target control mode includes:

[0016] When the high pressure is greater than or equal to the first pressure threshold, the outdoor fan rotates in the forward direction at the lowest operating speed.

[0017] When the third pressure threshold ≤ high pressure ≤ second pressure threshold, the outdoor fan rotates in reverse at the lowest operating speed;

[0018] When the high pressure is less than or equal to the fourth pressure threshold, the outdoor fan stops operating;

[0019] Among them, the first pressure threshold > the second pressure threshold > the third pressure threshold > the fourth pressure threshold.

[0020] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: the solution of this embodiment does not require reducing the minimum compressor operating frequency and minimum external fan speed of the unit, which effectively improves drive reliability and reduces development complexity; under the same minimum frequency and minimum speed, large fan blades and large casings can be used to increase the air volume in high-temperature cooling scenarios; the solution of this embodiment has low cost, does not require additional control components, and has high reliability.

[0021] In one embodiment of the present invention, the target control mode includes:

[0022] When the second pressure threshold is less than the high pressure and less than the first pressure threshold, or when the fourth pressure threshold is less than the high pressure and less than the third pressure threshold, the outdoor fan maintains its current control action.

[0023] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: The solution of this embodiment sets up a high-pressure buffer zone to avoid frequent changes in the control of the outdoor fan due to pressure detection fluctuations.

[0024] In one embodiment of the present invention, the air conditioner includes an upper outdoor fan and a lower outdoor fan arranged adjacent to each other, and the target control mode includes:

[0025] When the high pressure is greater than or equal to the first pressure threshold, both the upper outdoor fan and the lower outdoor fan rotate in the forward direction at the lowest operating speed.

[0026] When the fifth pressure threshold ≤ high pressure ≤ sixth pressure threshold, the upper outdoor fan rotates in the reverse direction at the lowest operating speed, and the lower outdoor fan rotates in the forward direction at the lowest operating speed.

[0027] When the third pressure threshold ≤ high pressure ≤ second pressure threshold, the upper outdoor fan rotates in reverse at the lowest operating speed, and the lower outdoor fan stops running.

[0028] When the high pressure is less than or equal to the fourth pressure threshold, both the upper outdoor fan and the lower outdoor fan will stop operating.

[0029] Among them, the first pressure threshold > the sixth pressure threshold > the fifth pressure threshold > the second pressure threshold > the third pressure threshold > the fourth pressure threshold.

[0030] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: In the solution of this embodiment, the upper outdoor fan can reduce the air volume by reversing and form a circulating heat island with the lower outdoor fan, thereby reducing the heat exchange of the outdoor unit heat exchanger and thus avoiding the frequent start-up and shutdown of the fan due to the imbalance of internal and external heat exchange.

[0031] In one embodiment of the present invention, the target control mode includes:

[0032] When the sixth pressure threshold is less than the high pressure threshold and less than the first pressure threshold, or the second pressure threshold is less than the high pressure threshold and less than the fifth pressure threshold, or the fourth pressure threshold is less than the high pressure threshold and less than the third pressure threshold, both the upper outdoor fan and the lower outdoor fan will maintain their current control actions.

[0033] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: The solution of this embodiment sets up a high-pressure buffer zone to avoid frequent changes in the control of the outdoor fan due to pressure detection fluctuations.

[0034] In one embodiment of the present invention, the air conditioner includes a first outdoor fan, a second outdoor fan, and a third outdoor fan, whose installation positions are sequentially lowered, and the target control mode includes:

[0035] When the high pressure is greater than or equal to the eighth pressure threshold, the first outdoor fan, the second outdoor fan and the third outdoor fan all rotate in the forward direction at the lowest operating speed.

[0036] When the first pressure threshold ≤ high pressure ≤ seventh pressure threshold, the first outdoor fan and the second outdoor fan rotate in the forward direction at the lowest operating speed, and the third outdoor fan stops operating.

[0037] When the fifth pressure threshold ≤ high pressure ≤ sixth pressure threshold, the first outdoor fan rotates in reverse at the lowest operating speed, the second outdoor fan rotates in forward at the lowest operating speed, and the third outdoor fan stops operating.

[0038] When the third pressure threshold ≤ high pressure ≤ second pressure threshold, the first outdoor fan rotates in reverse at the lowest operating speed, and both the second and third outdoor fans stop operating.

[0039] When the high pressure is less than or equal to the fourth pressure threshold, the first outdoor fan, the second outdoor fan, and the third outdoor fan will all stop operating.

[0040] Among them, the eighth pressure threshold > the seventh pressure threshold > the first pressure threshold > the sixth pressure threshold > the fifth pressure threshold > the second pressure threshold > the third pressure threshold > the fourth pressure threshold.

[0041] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: In low-temperature refrigeration scenarios, the solution in this embodiment reduces the air volume by reversing the fan, avoiding frequent start-stop of the outdoor fan or reducing the frequency of start-stop, effectively improving the reliability of the unit and the user's comfort; at the same time, the control of the outdoor fan's reverse and forward rotation according to the number of outdoor fans has wider applicability.

[0042] In one embodiment of the present invention, the target control mode includes:

[0043] When the seventh pressure threshold < high pressure < the eighth pressure threshold, or the sixth pressure threshold < high pressure < the first pressure threshold, or the second pressure threshold < high pressure < the fifth pressure threshold, or the fourth pressure threshold < high pressure < the third pressure threshold, the first outdoor fan, the second outdoor fan, and the third outdoor fan will all maintain their current control actions.

[0044] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: The solution of this embodiment sets up a high-pressure buffer zone to avoid frequent changes in the control of the outdoor fan due to pressure detection fluctuations.

[0045] To achieve the second objective of this invention, an embodiment of this invention provides a control device for an air conditioner. The air conditioner includes at least one outdoor fan. The control device includes: a detection module for acquiring compressor frequency, outdoor fan speed, and high pressure; and a judgment module for controlling the air conditioner to enter a target control mode when, in cooling mode or dehumidification mode, the compressor frequency reaches a first threshold, the outdoor fan speed reaches a second threshold, and the duration reaches a first time threshold. In the target control mode, the rotation direction and speed of the outdoor fan are controlled according to the high pressure.

[0046] The control device of the air conditioner in the embodiments of the present invention implements the steps of the control method of the air conditioner as in any embodiment of the present invention, and thus has all the beneficial effects of the control method of the air conditioner as in any embodiment of the present invention, which will not be repeated here.

[0047] To achieve the third objective of the present invention, an embodiment of the present invention provides an air conditioner, which includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the control method of the air conditioner as described in any embodiment of the present invention.

[0048] The air conditioner of the present invention implements the steps of the control method of the air conditioner as described in any embodiment of the present invention, and therefore has all the beneficial effects of the control method of the air conditioner as described in any embodiment of the present invention, which will not be repeated here.

[0049] To achieve the fourth objective of the present invention, embodiments of the present invention provide a readable storage medium on which a program or instructions are stored, which, when executed by a processor, implement the steps of the control method for an air conditioner as described in any embodiment of the present invention.

[0050] The readable storage medium of this invention implements the steps of the air conditioner control method of any embodiment of this invention, and thus has all the beneficial effects of the air conditioner control method of any embodiment of this invention, which will not be repeated here. Attached Figure Description

[0051] Figure 1 This is a flowchart illustrating the steps of a control method for an air conditioner according to some embodiments of the present invention;

[0052] Figure 2 This is a control schematic diagram of an air conditioner control method according to some embodiments of the present invention. Detailed Implementation

[0053] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0054] See Figure 1 This embodiment provides a control method for an air conditioner, the air conditioner including at least one outdoor fan, the control method including:

[0055] S100: Obtains compressor frequency, outdoor fan speed, and high pressure;

[0056] S200: In cooling or dehumidifying mode, when the compressor frequency reaches the first threshold, the outdoor fan speed reaches the second threshold, and the duration reaches the first time threshold, the air conditioner is controlled to enter the target control mode.

[0057] In target control mode, the rotation direction and speed of the outdoor fan are controlled according to the high pressure.

[0058] Furthermore, in S100, the compressor frequency, outdoor fan speed, and high pressure are all obtained by sensors located at corresponding locations.

[0059] It should be noted that the first threshold is the minimum allowable operating frequency of the compressor, and the second threshold is the minimum allowable speed of the outdoor fan.

[0060] Optionally, the first time threshold ranges from 30 seconds to 180 seconds; preferably, the first time threshold is 60 seconds.

[0061] In this embodiment, when operating in cooling mode at low ambient temperatures, the air conditioner is prone to liquid return or indoor unit frost formation due to the low external ambient temperature and low load demand. When the compressor frequency reaches the first threshold and the outdoor fan speed reaches the second threshold, it indicates that both the compressor frequency and the outdoor fan speed have been reduced to their minimum. If this duration reaches the first time threshold, it means that the air conditioner unit cannot meet reliability requirements. At this point, it needs to enter the target control mode to avoid frequent start-stop of the outdoor fan or to significantly reduce the frequency of start-stop, thereby reducing noise and indoor temperature fluctuations, improving user experience and unit reliability. In this embodiment, under target control mode, the rotation direction and speed of the outdoor fan are controlled according to the high pressure. That is, the solution in this embodiment can reduce the effective air volume and heat exchange by controlling the forward and reverse rotation and speed of the outdoor fan according to the high pressure, thus finding the heat exchange balance point of the unit as much as possible. The solution in this embodiment can accurately identify the operating status of the air conditioner and control it to enter the target control mode when needed, thereby effectively increasing the reliability of the control method of the present invention.

[0062] Understandably, the solution in this embodiment can reduce the effective air volume and heat exchange by controlling the forward and reverse rotation of the outdoor fan according to the unit's operating pressure, outdoor fan speed, and compressor operating frequency, without affecting the reliability of the outdoor unit's operation (without changing the compressor's minimum frequency and the outdoor fan's minimum speed), thereby finding the unit's heat exchange balance point as much as possible, avoiding frequent starts of the outdoor fan or reducing the frequency of start-stop, so that the unit can operate stably, improving the unit's operational reliability and user comfort.

[0063] Furthermore, in one specific embodiment, the air conditioner includes an outdoor fan, and the target control mode includes:

[0064] When the high pressure is greater than or equal to the first pressure threshold, the outdoor fan rotates in the forward direction at the lowest operating speed.

[0065] When the third pressure threshold ≤ high pressure ≤ second pressure threshold, the outdoor fan rotates in reverse at the lowest operating speed;

[0066] When the high pressure is less than or equal to the fourth pressure threshold, the outdoor fan stops operating;

[0067] Among them, the first pressure threshold > the second pressure threshold > the third pressure threshold > the fourth pressure threshold.

[0068] Optionally, the first pressure threshold ranges from 23 Bar to 25 Bar, the second pressure threshold ranges from 18 Bar to 19 Bar, the third pressure threshold ranges from 16.5 Bar to 17.5 Bar, and the fourth pressure threshold ranges from 14 Bar to 16 Bar.

[0069] Preferably, the first pressure threshold is 23 Bar, the second pressure threshold is 19 Bar, the third pressure threshold is 17 Bar, and the fourth pressure threshold is 14 Bar.

[0070] In this embodiment, when the high pressure is greater than or equal to the first pressure threshold, the air conditioning system operates normally, and the outdoor fan maintains operation at the lowest speed in the normal forward direction.

[0071] Furthermore, when the third pressure threshold ≤ high pressure ≤ second pressure threshold, the outdoor fan rotates in reverse at the lowest operating speed. When the outdoor fan reverses, due to the influence of the blade shape and air duct, the air volume can be reduced while the minimum outdoor unit speed remains unchanged, thereby reducing the heat exchange and maintaining the heat exchange balance between the indoor and outdoor units as much as possible.

[0072] Furthermore, when the high pressure is less than or equal to the fourth pressure threshold, the outdoor fan stops operating. Since the high pressure is low at this time, the reversing fan cannot meet the operating requirements. In order to ensure the reliability of the unit, the outdoor fan is shut down.

[0073] Understandably, the solution in this embodiment does not require reducing the minimum compressor operating frequency and minimum external fan speed of the unit, which effectively improves drive reliability and reduces development complexity; under the same minimum frequency and minimum speed, large fan blades and large casings can be used to increase air volume in high-temperature cooling scenarios; the solution in this embodiment is low in cost, requires no additional control components, and has high reliability.

[0074] Furthermore, in one specific embodiment, the target control mode includes:

[0075] When the second pressure threshold is less than the high pressure and less than the first pressure threshold, or when the fourth pressure threshold is less than the high pressure and less than the third pressure threshold, the outdoor fan maintains its current control action.

[0076] For example, when it is detected that the high pressure is greater than or equal to the first pressure threshold, the outdoor fan is controlled to operate normally at the lowest speed. When it is detected that the second pressure threshold is less than the high pressure and less than the first pressure threshold, the outdoor fan maintains the current control action, that is, the outdoor fan is controlled to operate normally at the lowest speed.

[0077] Understandably, the solution in this embodiment is designed with a high-pressure buffer zone to avoid frequent changes in outdoor fan control due to pressure fluctuations.

[0078] Further, see Figure 2 In one specific embodiment, the air conditioner includes an upper outdoor fan and a lower outdoor fan arranged adjacent to each other, and the target control mode includes:

[0079] When the high pressure is greater than or equal to the first pressure threshold, both the upper outdoor fan and the lower outdoor fan rotate in the forward direction at the lowest operating speed.

[0080] When the fifth pressure threshold ≤ high pressure ≤ sixth pressure threshold, the upper outdoor fan rotates in the reverse direction at the lowest operating speed, and the lower outdoor fan rotates in the forward direction at the lowest operating speed.

[0081] When the third pressure threshold ≤ high pressure ≤ second pressure threshold, the upper outdoor fan rotates in reverse at the lowest operating speed, and the lower outdoor fan stops running.

[0082] When the high pressure is less than or equal to the fourth pressure threshold, both the upper outdoor fan and the lower outdoor fan will stop operating.

[0083] Among them, the first pressure threshold > the sixth pressure threshold > the fifth pressure threshold > the second pressure threshold > the third pressure threshold > the fourth pressure threshold.

[0084] Optionally, the fifth pressure threshold ranges from 20 Bar to 21 Bar, and the sixth pressure threshold ranges from 21 Bar to 22 Bar.

[0085] Preferably, the sixth pressure threshold is 21.5 Bar and the fifth pressure threshold is 20.5 Bar.

[0086] In this embodiment, the air conditioner includes an upper outdoor fan and a lower outdoor fan arranged adjacent to each other, as detailed in the following document. Figure 2 .

[0087] Furthermore, when the high pressure is greater than or equal to the first pressure threshold, the air conditioning system operates normally, and both the upper and lower outdoor fans rotate in the forward direction at the lowest possible operating speed.

[0088] Furthermore, when the fifth pressure threshold ≤ high pressure ≤ sixth pressure threshold, the upper outdoor fan rotates in reverse at the lowest operating speed, and the lower outdoor fan rotates in forward at the lowest operating speed. When both fans rotate forward, the inlet air temperature is low, resulting in a large temperature difference with the outdoor unit's heat exchanger, leading to good heat exchange efficiency and a large amount of heat exchanged. By having one fan rotate forward and the other in reverse, a small-scale airflow circulation is formed. (See [reference needed]). Figure 2 In other words, cold air is transformed into warm air through heat exchange and is blown out by the lower outdoor fan. Because the wind speed is low at this time and is blocked by the mesh cover, the wind will not travel far and will rise due to the high temperature of the blown air. The blown warm air will be drawn in by the upper outdoor fan, blown out through the heat exchanger. At this time, due to the small temperature difference, the heat exchange effect of the outdoor unit's heat exchanger will be poor and the heat exchange capacity will be small. The blown air, due to its low wind speed, will also be drawn in by the lower outdoor fan, gradually forming a relatively high-temperature heat cycle, thereby reducing the heat exchange capacity of the outdoor heat exchanger and avoiding frequent start-stop of the fan due to the imbalance of heat exchange between the inside and outside.

[0089] Furthermore, when the third pressure threshold ≤ high pressure ≤ second pressure threshold, the upper outdoor fan rotates in reverse at the lowest operating speed, and the lower outdoor fan stops operating; at this time, the high pressure is further reduced, and the air volume is reduced by stopping one fan.

[0090] Furthermore, when the high pressure is less than or equal to the fourth pressure threshold, both the upper and lower outdoor fans stop operating. At this time, the high pressure is low, and the reversing fan cannot meet the operating requirements. To ensure the reliability of the unit, the outdoor fans are shut down.

[0091] It should be noted that in this embodiment, there are 6 pressure thresholds and 7 high-pressure intervals. A fifth and sixth pressure threshold are inserted between the first and second pressure thresholds. Since the air volume and heat exchange area of ​​the dual outdoor fans are larger, the heat absorbed on the outside is more likely to exceed the cooling demand on the inside. Under normal control, if the heat exchange of the two fans at low speed exceeds the indoor demand, one or two outdoor fans will be stopped directly. At this time, it may be necessary to find that the heat exchange of the two outdoor fans exceeds the indoor demand, and the heat exchange of the fan that is stopped cannot meet the indoor demand. Therefore, in this embodiment, a high-pressure interval is added: one fan rotates forward and the other fan rotates in reverse to reduce the air volume and the heat exchange temperature difference, so as to meet the needs in this scenario.

[0092] Understandably, in the solution of this embodiment, the upper outdoor fan can reduce the air volume by reversing and form a circulating heat island with the lower outdoor fan, thereby reducing the heat exchange of the outdoor unit heat exchanger and thus avoiding the frequent start-up and shutdown of the fan due to the imbalance of internal and external heat exchange.

[0093] Furthermore, in one specific embodiment, the target control mode includes:

[0094] When the sixth pressure threshold is less than the high pressure threshold and less than the first pressure threshold, or the second pressure threshold is less than the high pressure threshold and less than the fifth pressure threshold, or the fourth pressure threshold is less than the high pressure threshold and less than the third pressure threshold, both the upper outdoor fan and the lower outdoor fan will maintain their current control actions.

[0095] Understandably, the solution in this embodiment is designed with a high-pressure buffer zone to avoid frequent changes in outdoor fan control due to pressure fluctuations.

[0096] Furthermore, in one specific embodiment, the air conditioner includes a first outdoor fan, a second outdoor fan, and a third outdoor fan, positioned sequentially at lower elevations, and the target control mode includes:

[0097] When the high pressure is greater than or equal to the eighth pressure threshold, the first outdoor fan, the second outdoor fan and the third outdoor fan all rotate in the forward direction at the lowest operating speed.

[0098] When the first pressure threshold ≤ high pressure ≤ seventh pressure threshold, the first outdoor fan and the second outdoor fan rotate in the forward direction at the lowest operating speed, and the third outdoor fan stops operating.

[0099] When the fifth pressure threshold ≤ high pressure ≤ sixth pressure threshold, the first outdoor fan rotates in reverse at the lowest operating speed, the second outdoor fan rotates in forward at the lowest operating speed, and the third outdoor fan stops operating.

[0100] When the third pressure threshold ≤ high pressure ≤ second pressure threshold, the first outdoor fan rotates in reverse at the lowest operating speed, and both the second and third outdoor fans stop operating.

[0101] When the high pressure is less than or equal to the fourth pressure threshold, the first outdoor fan, the second outdoor fan, and the third outdoor fan will all stop operating.

[0102] Among them, the eighth pressure threshold > the seventh pressure threshold > the first pressure threshold > the sixth pressure threshold > the fifth pressure threshold > the second pressure threshold > the third pressure threshold > the fourth pressure threshold.

[0103] Optionally, the seventh pressure threshold ranges from 25.5 Bar to 26.5 Bar, and the eighth pressure threshold ranges from 27 Bar to 28 Bar.

[0104] Preferably, the eighth pressure threshold is 27 Bar and the seventh pressure threshold is 26 Bar.

[0105] In this embodiment, the air conditioner includes a first outdoor fan, a second outdoor fan, and a third outdoor fan, which are installed at progressively lower positions. The first outdoor fan is the outdoor fan with the highest installation position, and the second outdoor fan is the outdoor fan with the second highest installation position. The number of third outdoor fans is at least one, and the number of third outdoor fans will not affect the control method of this embodiment.

[0106] Furthermore, when the high pressure is greater than or equal to the eighth pressure threshold, the first outdoor fan, the second outdoor fan, and the third outdoor fan all rotate in the forward direction at the lowest operating speed; the outdoor fans operate in the forward direction at the lowest speed, i.e., they maintain operation.

[0107] Furthermore, when the first pressure threshold ≤ high pressure ≤ seventh pressure threshold, the first and second outdoor fans rotate forward at the lowest operating speed, while the third outdoor fan stops operating; that is, the first and second outdoor fans at the top are kept rotating forward at the lowest speed, while the third outdoor fan stops operating; the reason for only turning on the first and second outdoor fans is that hot air rises, and the upper part of the air in a local area has a higher temperature. Turning on only the first and second outdoor fans can reduce the temperature difference and reduce the heat exchange.

[0108] Furthermore, when the fifth pressure threshold ≤ high pressure ≤ sixth pressure threshold, the first outdoor fan rotates in reverse at the lowest operating speed, the second outdoor fan rotates in forward at the lowest operating speed, and the third outdoor fan stops operating; the reversal of the first outdoor fan can reduce the air volume and form a circulating heat island with the second outdoor fan, reducing the heat exchange of the outdoor unit heat exchanger.

[0109] Furthermore, when the third pressure threshold ≤ high pressure ≤ second pressure threshold, the first outdoor fan rotates in reverse at the lowest operating speed, and both the second and third outdoor fans stop operating; at this time, the high pressure is further reduced, and the air volume is reduced by only turning on the first outdoor fan.

[0110] Furthermore, when the high pressure is less than or equal to the fourth pressure threshold, the first outdoor fan, the second outdoor fan, and the third outdoor fan all stop operating. At this time, the high pressure is low, and the reversing fan cannot meet the operating requirements. In order to ensure the reliability of the unit, the outdoor fans are shut down.

[0111] It should be noted that in this embodiment, there are 8 pressure thresholds and 9 high-pressure ranges. A seventh pressure threshold and an eighth pressure threshold are inserted before the first pressure threshold. Because multi-blade outdoor units have a large number of outdoor fans, large air volume, and large heat exchange area, the fluctuations are greater for the same internal cooling demand, which makes it easier to trigger frequent fan shutdowns. Therefore, pressure needs to be controlled in advance, resulting in more high-pressure ranges.

[0112] Understandably, in low-temperature refrigeration scenarios, the solution in this embodiment reduces airflow by reversing the fan, thereby avoiding frequent start-stop of the outdoor fan or reducing the frequency of start-stop, effectively improving unit reliability and user comfort. At the same time, the control of the outdoor fan's reverse and forward rotation based on the number of outdoor fans makes it more widely applicable.

[0113] Furthermore, in one specific embodiment, the target control mode includes:

[0114] When the seventh pressure threshold < high pressure < the eighth pressure threshold, or the sixth pressure threshold < high pressure < the first pressure threshold, or the second pressure threshold < high pressure < the fifth pressure threshold, or the fourth pressure threshold < high pressure < the third pressure threshold, the first outdoor fan, the second outdoor fan, and the third outdoor fan will all maintain their current control actions.

[0115] Understandably, the solution in this embodiment is designed with a high-pressure buffer zone to avoid frequent changes in outdoor fan control due to pressure fluctuations.

[0116] Furthermore, this embodiment provides a control device for an air conditioner, the air conditioner including at least one outdoor fan, and the control device including:

[0117] The detection module is used to obtain compressor frequency, outdoor fan speed and high pressure;

[0118] The judgment module is used to control the air conditioner to enter the target control mode when the compressor frequency reaches the first threshold, the outdoor fan speed reaches the second threshold, and the duration reaches the first time threshold in either cooling or dehumidification mode.

[0119] In target control mode, the rotation direction and speed of the outdoor fan are controlled according to the high pressure.

[0120] The control device of the air conditioner in the embodiments of the present invention implements the steps of the control method of the air conditioner as in any embodiment of the present invention, and thus has all the beneficial effects of the control method of the air conditioner as in any embodiment of the present invention, which will not be repeated here.

[0121] Furthermore, this embodiment provides an air conditioner, which includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the control method of the air conditioner as described in any embodiment of the present invention.

[0122] The air conditioner of the present invention implements the steps of the control method of the air conditioner as described in any embodiment of the present invention, and therefore has all the beneficial effects of the control method of the air conditioner as described in any embodiment of the present invention, which will not be repeated here.

[0123] Furthermore, this embodiment provides a readable storage medium on which a program or instructions are stored. When the program or instructions are executed by a processor, they implement the steps of the air conditioner control method as described in any embodiment of the present invention.

[0124] The readable storage medium of this invention implements the steps of the air conditioner control method of any embodiment of this invention, and thus has all the beneficial effects of the air conditioner control method of any embodiment of this invention, which will not be repeated here.

[0125] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes at least one outdoor fan, and the control method includes: S100: Obtains compressor frequency, outdoor fan speed, and high pressure; S200: In cooling mode or dehumidification mode, when the compressor frequency reaches a first threshold, the outdoor fan speed reaches a second threshold, and the duration reaches a first time threshold, the air conditioner is controlled to enter the target control mode. Wherein, the first threshold is the minimum allowable operating frequency value of the compressor, and the second threshold is the minimum allowable speed value of the outdoor fan; in the target control mode, the rotation direction and minimum operating speed of the outdoor fan are controlled according to the high pressure.

2. The control method according to claim 1, characterized in that, The air conditioner includes one outdoor fan, and the target control mode includes: When the high pressure is greater than or equal to the first pressure threshold, the outdoor fan rotates in the forward direction at the lowest operable speed. When the third pressure threshold is less than or equal to the high pressure and less than or equal to the second pressure threshold, the outdoor fan rotates in reverse at the lowest possible operating speed. When the high pressure is less than or equal to the fourth pressure threshold, the outdoor fan stops operating; Wherein, the first pressure threshold > the second pressure threshold > the third pressure threshold > the fourth pressure threshold.

3. The control method according to claim 2, characterized in that, The target control mode includes: When the second pressure threshold is less than the high pressure and less than the first pressure threshold, or when the fourth pressure threshold is less than the high pressure and less than the third pressure threshold, the outdoor fan maintains its current control action.

4. The control method according to claim 1, characterized in that, The air conditioner includes an upper outdoor fan and a lower outdoor fan arranged adjacent to each other, and the target control mode includes: When the high pressure is greater than or equal to the first pressure threshold, both the upper outdoor fan and the lower outdoor fan rotate in the forward direction at the lowest operating speed. When the fifth pressure threshold ≤ the high pressure ≤ the sixth pressure threshold, the upper outdoor fan rotates in the reverse direction at the lowest operable speed, and the lower outdoor fan rotates in the forward direction at the lowest operable speed. When the third pressure threshold ≤ the high pressure ≤ the second pressure threshold, the upper outdoor fan rotates in reverse at the lowest operating speed, and the lower outdoor fan stops operating. When the high pressure is less than or equal to the fourth pressure threshold, both the upper outdoor fan and the lower outdoor fan will stop operating. Wherein, the first pressure threshold > the sixth pressure threshold > the fifth pressure threshold > the second pressure threshold > the third pressure threshold > the fourth pressure threshold.

5. The control method according to claim 4, characterized in that, The target control mode includes: When the sixth pressure threshold is less than the high pressure and less than the first pressure threshold, or the second pressure threshold is less than the high pressure and less than the fifth pressure threshold, or the fourth pressure threshold is less than the high pressure and less than the third pressure threshold, both the upper outdoor fan and the lower outdoor fan maintain their current control actions.

6. The control method according to claim 1, characterized in that, The air conditioner includes a first outdoor fan, a second outdoor fan, and a third outdoor fan, positioned sequentially at decreasing locations. The target control mode includes: When the high pressure is greater than or equal to the eighth pressure threshold, the first outdoor fan, the second outdoor fan, and the third outdoor fan all rotate in the forward direction at the lowest operable speed. When the first pressure threshold ≤ the high pressure ≤ the seventh pressure threshold, the first outdoor fan and the second outdoor fan rotate in the forward direction at the lowest operating speed, and the third outdoor fan stops operating. When the fifth pressure threshold ≤ the high pressure ≤ the sixth pressure threshold, the first outdoor fan rotates in reverse at the lowest operating speed, the second outdoor fan rotates in forward at the lowest operating speed, and the third outdoor fan stops operating. When the third pressure threshold is less than or equal to the high pressure and less than or equal to the second pressure threshold, the first outdoor fan rotates in reverse at the lowest operating speed, and both the second and third outdoor fans stop operating. When the high pressure is less than or equal to the fourth pressure threshold, the first outdoor fan, the second outdoor fan, and the third outdoor fan all stop operating. Wherein, the eighth pressure threshold > the seventh pressure threshold > the first pressure threshold > the sixth pressure threshold > the fifth pressure threshold > the second pressure threshold > the third pressure threshold > the fourth pressure threshold.

7. The control method according to claim 6, characterized in that, The target control mode includes: When the seventh pressure threshold is less than the high pressure and the eighth pressure threshold, or the sixth pressure threshold is less than the high pressure and the first pressure threshold, or the second pressure threshold is less than the high pressure and the fifth pressure threshold, or the fourth pressure threshold is less than the high pressure and the third pressure threshold, the first outdoor fan, the second outdoor fan, and the third outdoor fan all maintain their current control actions.

8. A control device for an air conditioner, characterized in that, The air conditioner includes at least one outdoor fan, and the control device includes: The detection module is used to acquire compressor frequency, outdoor fan speed and high pressure; The judgment module is used to control the air conditioner to enter the target control mode when the compressor frequency reaches a first threshold, the outdoor fan speed reaches a second threshold, and the duration reaches a first time threshold in either cooling or dehumidification mode. Wherein, the first threshold is the minimum allowable operating frequency value of the compressor, and the second threshold is the minimum allowable speed value of the outdoor fan; in the target control mode, the rotation direction and minimum operating speed of the outdoor fan are controlled according to the high pressure.

9. An air conditioner, characterized in that, The air conditioner includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the control method as described in any one of claims 1 to 7.

10. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the control method as described in any one of claims 1 to 7.

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