Air conditioner, control method and device therefor, and computer-readable storage medium

Abstract

The application discloses an air conditioner and a control method, a control device and a computer readable storage medium thereof. The method comprises the following steps: in response to a heating start instruction of the air conditioner, controlling an outdoor fan to operate at a target rotating speed; when the heating operation time of the air conditioner reaches a first preset time, respectively acquiring the wind loss pressure difference change rate of the outdoor heat exchanger in adjacent preset time intervals, wherein the wind loss pressure difference refers to the pressure difference between the windward surface and the leeward surface of the outdoor heat exchanger; when the wind loss pressure difference change rate of the current preset time interval is less than that of the last preset time interval, controlling the outdoor fan to operate at a preset rotating speed, wherein the preset rotating speed is greater than the target rotating speed. The control method of the application can delay the frosting process of the air conditioner, thereby solving the problem that the air conditioner frequently frosts and defrosts during the heating operation, resulting in large indoor temperature fluctuation and poor thermal comfort experience.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioner control method, an air conditioner control device, a computer-readable storage medium, and an air conditioner. Background Technology

[0002] Hydrophilic coatings are commonly used in the heat exchangers of outdoor air conditioning units. Due to their good wettability and small contact angle, hydrophilic coatings spread on the fin surface to form a water film, preventing the scattering of condensed water droplets and reducing ventilation resistance, thereby improving heat exchange efficiency. They are widely used in the field of air conditioning heat exchangers.

[0003] When heating at low temperatures, the outdoor unit's heat exchanger forms a water film on its hydrophilic coating, resulting in rapid frost formation and poor anti-frost performance. This necessitates frequent defrosting of the outdoor unit's heat exchanger. During defrosting, the air conditioning system not only stops supplying heat to the room but also absorbs heat from the room, severely impacting the indoor thermal comfort environment and providing users with a poor user experience. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a control method for an air conditioner. By applying a disturbance during the frosting process of the outdoor fan when the air conditioner is in heating mode, the frosting process can be delayed, thereby solving the problem of frequent frosting and defrosting during heating mode, which leads to large fluctuations in indoor temperature and poor thermal comfort.

[0005] The second objective of this invention is to provide a control device for an air conditioner.

[0006] A third objective of this invention is to provide a computer-readable storage medium.

[0007] The fourth objective of this invention is to provide an air conditioner.

[0008] To achieve the above objectives, a first aspect of the present invention provides a control method for an air conditioner, comprising: responding to a heating start command of the air conditioner and controlling an outdoor fan to operate at a target speed; when the heating operation time of the air conditioner reaches a first preset time, acquiring the rate of change of wind loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals, wherein the wind loss pressure difference indicates the pressure difference between the windward and leeward sides of the outdoor heat exchanger; and when the rate of change of wind loss pressure difference in the current preset time interval is less than the rate of change of wind loss pressure difference in the previous preset time interval, controlling the outdoor fan to operate at a preset speed, wherein the preset speed is greater than the target speed.

[0009] According to the air conditioner control method of this embodiment, in response to the air conditioner's heating start command, the outdoor fan is controlled to operate at a target speed. When the air conditioner's heating operation time reaches a first preset time, the rate of change of wind loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals is acquired, wherein the wind loss pressure difference indicates the pressure difference between the windward and leeward sides of the outdoor heat exchanger. When the rate of change of wind loss pressure difference in the current preset time interval is less than the rate of change of wind loss pressure difference in the previous preset time interval, the outdoor fan is controlled to operate at a preset speed, wherein the preset speed is greater than the target speed. Therefore, this method, by applying a disturbance to the outdoor fan speed during the frosting process when the air conditioner is heating, can delay the frosting process of the air conditioner, thereby solving the problem of frequent frosting and defrosting during the air conditioner's heating operation, which leads to large fluctuations in indoor temperature and poor thermal comfort.

[0010] In addition, the air conditioner control method according to the above embodiments of the present invention may also have the following additional technical features:

[0011] According to an embodiment of the present invention, after controlling the outdoor fan to run at a preset speed, the control method of the air conditioner further includes: obtaining the rate of change of air loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals; if the rate of change of air loss pressure difference in the current preset time interval is less than or equal to the rate of change of air loss pressure difference in the previous preset time interval, then controlling the outdoor fan to run at the preset speed unchanged.

[0012] According to one embodiment of the present invention, if the rate of change of wind loss pressure difference in the current preset time interval is greater than the rate of change of wind loss pressure difference in the previous preset time interval, the outdoor fan is controlled to switch to the target speed operation.

[0013] According to an embodiment of the present invention, after controlling the outdoor fan to switch to the target speed, the control method of the air conditioner further includes: obtaining the current air loss pressure difference of the outdoor heat exchanger; when the current air loss pressure difference is less than a preset threshold, controlling the outdoor fan to operate at the target speed unchanged; when the current air loss pressure difference is greater than or equal to the preset threshold, controlling the air conditioner to enter the defrosting mode.

[0014] According to one embodiment of the present invention, the control method of the air conditioner further includes: when the rate of change of wind loss pressure difference in the current preset time interval is greater than or equal to the rate of change of wind loss pressure difference in the previous preset time interval, controlling the outdoor fan to operate at the target speed.

[0015] According to one embodiment of the present invention, the preset rotational speed is the maximum allowable rotational speed of the outdoor fan.

[0016] According to one embodiment of the present invention, the first preset time is 10 min to 15 min, and the preset time interval is 2 min to 4 min.

[0017] To achieve the above objectives, a second aspect of the present invention provides a control device for an air conditioner, comprising: a control module for responding to a heating start command of the air conditioner and controlling the outdoor fan to operate at a target speed; an acquisition module for acquiring the rate of change of wind loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals when the heating operation time of the air conditioner reaches a first preset time, wherein the wind loss pressure difference indicates the pressure difference between the windward and leeward sides of the outdoor heat exchanger; and the control module further for controlling the outdoor fan to operate at a preset speed when the rate of change of wind loss pressure difference in the current preset time interval is less than the rate of change of wind loss pressure difference in the previous preset time interval, wherein the preset speed is greater than the target speed.

[0018] According to an embodiment of the present invention, the control device for an air conditioner includes a control module that responds to the air conditioner's heating start command and controls the outdoor fan to operate at a target speed. An acquisition module is used to acquire the rate of change of wind loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals when the air conditioner's heating operation time reaches a first preset time. The wind loss pressure difference indicates the pressure difference between the windward and leeward sides of the outdoor heat exchanger. The control module is also used to control the outdoor fan to operate at a preset speed when the rate of change of wind loss pressure difference in the current preset time interval is less than the rate of change in wind loss pressure difference in the previous preset time interval. The preset speed is greater than the target speed. Therefore, by applying a disturbance to the outdoor fan speed during the frosting process when the air conditioner is heating, this device can delay the frosting process of the air conditioner, thereby solving the problem of frequent frosting and defrosting during heating, which leads to large fluctuations in indoor temperature and poor thermal comfort.

[0019] To achieve the above objectives, a third aspect of the present invention provides a computer-readable storage medium storing a control program for an air conditioner, which, when executed by a processor, implements the above-described air conditioner control method.

[0020] According to the computer-readable storage medium of the present invention, by executing the above-described air conditioner control method, the frosting process of the air conditioner can be delayed, thereby solving the problem of frequent frosting and defrosting during the heating operation of the air conditioner, which leads to large fluctuations in indoor temperature and poor thermal comfort.

[0021] To achieve the above objectives, a fourth aspect of the present invention provides an air conditioner, comprising: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor. When the processor executes the air conditioner control program, it implements the above-described air conditioner control method.

[0022] According to the air conditioner of the present invention, by executing the above-described air conditioner control method, the frosting process of the air conditioner can be delayed, thereby solving the problem of frequent frosting and defrosting during the heating operation of the air conditioner, which leads to large fluctuations in indoor temperature and poor thermal comfort.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] Figure 1 This is a flowchart of an air conditioner control method according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the force analysis of droplets on the surface of a superhydrophobic coating heat exchanger according to an embodiment of the present invention;

[0026] Figure 3 A graph showing the change of wind loss pressure difference over time during the low-temperature heating and frosting process of a superhydrophobic coated heat exchanger according to an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of an air conditioner system according to an embodiment of the present invention;

[0028] Figure 5 A flowchart illustrating a control method for an air conditioner according to a specific example of the present invention;

[0029] Figure 6 This is a block diagram of the control device for an air conditioner according to an embodiment of the present invention;

[0030] Figure 7 This is a block diagram of an air conditioner according to an embodiment of the present invention. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] The following description, with reference to the accompanying drawings, outlines an air conditioner control method, an air conditioner control device, a computer-readable storage medium, and an air conditioner according to embodiments of the present invention.

[0033] Currently, when air conditioning systems operate in low-temperature, high-humidity environments, the outdoor heat exchanger frequently frosts and defrosts, leading to inconsistent indoor heating, fluctuating indoor temperatures, and poor thermal comfort. Furthermore, defrosting is typically only initiated when the frosting has worsened to a certain extent, failing to effectively assess, intervene, and control the process before it deteriorates in the early stages of frosting. Therefore, it cannot improve indoor thermal comfort during air conditioning heating by delaying frosting. To address this, this invention proposes a control method for air conditioners that utilizes the hydrophobic properties of superhydrophobic surfaces to delay the frosting process. Simultaneously, based on the characteristics of the superhydrophobic frosting process, it identifies the turning point where frosting begins to worsen during the frosting process and applies intervention and control to further delay frosting.

[0034] Conventional air conditioner outdoor unit heat exchangers use hydrophilic coatings. During the frosting process, due to the hydrophilic properties of the fin surface, condensed droplets easily spread into a water film. This water film is readily frozen, forming a thin frost layer. Once formed, the frost layer is difficult to remove, leading to its accumulation and increasing airflow pressure differential, eventually covering the entire surface and triggering defrosting. In contrast, the outdoor heat exchanger in this invention features a superhydrophobic coating, extending the frosting cycle from 40 minutes to 120 minutes—three times longer than with hydrophilic coatings. The frosting process of the superhydrophobic coating heat exchanger differs significantly from that of the hydrophilic coating. Due to the extremely low surface tension of the superhydrophobic surface, droplets cannot spread to form a water film and remain as droplets. Figure 2 The diagram shows the force analysis of droplets on the surface of a superhydrophobic coating heat exchanger. In the vertical direction, the droplets are subjected to downward gravity (Pg) and upward adhesion to the wall (Fn). In the horizontal direction, they are subjected to wind force (Wx) from the airflow and corresponding frictional force (Fm) from the wall. The droplets are easily detached under their own weight, thus effectively delaying frost formation on the surface of the outdoor heat exchanger.

[0035] In one embodiment of the present invention, such as Figure 3As shown, the frosting process on the surface of the superhydrophobic coating heat exchanger can be divided into four stages. In the first stage (0-25 minutes), droplets begin to form and grow on the surface of the superhydrophobic heat exchanger, and the air loss pressure difference increases rapidly. In the second stage (25-50 minutes), the droplets on the surface of the superhydrophobic heat exchanger grow to a certain extent, and due to their own gravity, they begin to fall off the surface of the heat exchanger, reaching a relatively stable dynamic equilibrium state, at which point the air loss pressure difference remains basically unchanged. In the third stage (50-75 minutes), as the droplets continue to grow, water bridges begin to form locally on the surfaces of adjacent fins of the superhydrophobic coating heat exchanger, and the droplets begin to accumulate, and the air loss pressure difference gradually increases again. In the fourth stage (75-120 minutes), frost begins to form on the water bridge between two superhydrophobic fins, and the frost worsens, accumulating more and more, and the air loss pressure difference of the heat exchanger rises more rapidly. Finally, the heat exchanger is completely covered with frost, and the air conditioning system can enter the defrosting operation mode. Therefore, based on the characteristics of the wind loss pressure difference change during the frosting process of the superhydrophobic heat exchanger, corresponding control methods can be adopted to delay frosting.

[0036] Figure 1 This is a flowchart of an air conditioner control method according to an embodiment of the present invention.

[0037] like Figure 1 As shown, the control method for an air conditioner according to an embodiment of the present invention may include the following steps:

[0038] S1 responds to the air conditioner's heating start command and controls the outdoor fan to run at the target speed.

[0039] S2, when the heating operation time of the air conditioner reaches the first preset time, the change rate of wind loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals is obtained respectively. The wind loss pressure difference refers to the pressure difference between the windward and leeward sides of the outdoor heat exchanger. The first preset time can be determined according to the actual situation. For example, the value of the first preset time is 10min to 15min. The preset time interval can be determined according to the actual situation. For example, the value of the preset time interval is 2min to 4min.

[0040] S3, when the rate of change of wind loss pressure difference in the current preset time interval is less than the rate of change of wind loss pressure difference in the previous preset time interval, control the outdoor fan to run at a preset speed, wherein the preset speed is greater than the target speed, and the preset speed is the maximum speed allowed by the outdoor fan.

[0041] Specifically, in response to the air conditioner's heating start command, which can be issued by the user via the air conditioner remote control or via a mobile device connected to the air conditioner, etc., the air conditioner will respond as follows: Figure 4As shown, the refrigerant flows from compressor 10 to four-way valve 20, and then to indoor heat exchanger 30. The refrigerant condenses and liquefies, releasing heat, becoming a liquid and simultaneously heating the indoor air, thus raising the indoor temperature. The liquid refrigerant passes through electronic expansion valve 40 for throttling and pressure reduction, then flows to outdoor heat exchanger 50 where it evaporates and absorbs heat, becoming a gas. Simultaneously, it absorbs heat from the outdoor air. The gaseous refrigerant then returns to compressor 10 through four-way valve 20 for the next cycle. When the temperature of outdoor heat exchanger 50 is lower than the air dew point temperature, water begins to condense on the fin surface. When the surface temperature is below 0 degrees Celsius, frost formation is inevitable. The frost formation process basically involves water droplet formation, growth, freezing, frost crystal formation, and frost layer thickening. Therefore, after responding to the air conditioner's heating start command, the outdoor fan can be controlled to run at a target speed, for example, controlling the outdoor fan to run at any speed between 450 rad / min and 600 rad / min, blowing water droplets off the fins before frost forms.

[0042] In low-temperature and high-humidity environments, when an air conditioner first starts operating in heating mode, water droplets do not form rapidly on the outdoor heat exchanger; frost formation takes time. Therefore, when the air conditioner's heating operation time reaches a first preset time (e.g., between 10 and 15 minutes), the rate of change of the wind loss pressure difference on the outdoor heat exchanger at adjacent preset time intervals can be obtained. For example, first, the wind loss pressure difference of the outdoor heat exchanger after 20 minutes of heating operation can be obtained, and then, after an interval of 2 to 4 minutes, the wind loss pressure difference after 24 minutes of heating operation can be obtained. After obtaining the wind loss pressure difference, the rate of change of the wind loss pressure difference can be calculated by the ratio of the difference between the two wind loss pressure differences to the time interval. The wind loss pressure difference refers to the pressure difference between the windward and leeward sides of the outdoor heat exchanger. Figure 4 In the process, the wind loss pressure differential can be obtained through the wind loss pressure differential sensor 60 installed on the outdoor heat exchanger. Therefore, the rate of change of wind loss pressure differential in the current time interval can be recorded as K2, and the rate of change of wind loss pressure differential in the previous time interval, for example, the rate of change of wind loss pressure differential in the 16th to 20th minute of heating operation, can be recorded as K1. Thus, based on the rate of change of wind loss pressure differential, it can be determined which stage of frosting is currently in, and the corresponding control mode can be selected.

[0043] When the rate of change of wind loss pressure differential in the current preset time interval is less than the rate of change of wind loss pressure differential in the previous preset time interval—for example, if the rate of change of wind loss pressure differential in the current preset time interval is K2 and the rate of change of wind loss pressure differential in the previous preset time interval is K1, and K2 is less than K1—it indicates that the droplets on the surface of the outdoor heat exchanger are beginning to detach due to their own gravity. At this point, the rate of change of wind loss pressure differential reaches a dynamic equilibrium and stability of the droplets on the surface of the outdoor heat exchanger. Figure 2In the second stage, the outdoor fan can be controlled to operate at a preset speed. For example, the outdoor fan can be controlled to blow air at the maximum speed allowed by the outdoor fan (800 rad / min to 950 rad / min) and maintain the maximum speed operation. This applies wind disturbance to accelerate the rolling off of liquid droplets on the surface of the outdoor heat exchanger or to blow away small liquid droplets with strong wind, thereby further delaying the frost formation on the surface of the outdoor heat exchanger.

[0044] The specific workflow of the air conditioner control method of the present invention is described in detail below.

[0045] According to an embodiment of the present invention, after controlling the outdoor fan to run at a preset speed, the control method of the air conditioner further includes: obtaining the rate of change of air loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals; if the rate of change of air loss pressure difference in the current preset time interval is less than or equal to the rate of change of air loss pressure difference in the previous preset time interval, then controlling the outdoor fan to run at the preset speed unchanged.

[0046] According to one embodiment of the present invention, if the rate of change of wind loss pressure difference in the current preset time interval is greater than the rate of change of wind loss pressure difference in the previous preset time interval, the outdoor fan is controlled to switch to the target speed operation.

[0047] Specifically, after controlling the outdoor fan to operate at its maximum permissible speed, the rate of change of air loss pressure difference of the outdoor heat exchanger is acquired again in adjacent preset time intervals. The relationship between the rate of change of air loss pressure difference K2 in the current preset time interval and the rate of change of air loss pressure difference K1 in the previous preset time interval is determined. If the rate of change of air loss pressure difference K2 in the current preset time interval is less than or equal to the rate of change of air loss pressure difference K1 in the previous preset time interval, it indicates that the disturbance is still effective and the rate of change of air loss pressure difference has not increased. The current state of operation is maintained, that is, the outdoor fan is controlled to operate at its maximum permissible speed. If the rate of change of air loss pressure difference K2 in the current preset time interval is greater than the rate of change of air loss pressure difference K1 in the previous preset time interval, it indicates that the disturbance is ineffective and the rate of change of air loss pressure difference has increased. At this time, a water bridge has formed between the fins of the outdoor heat exchanger, and increasing the air volume can no longer blow away the droplets. Therefore, in order to reduce energy consumption, the speed of the outdoor fan can be adjusted from the maximum permissible speed to the target speed and maintained.

[0048] According to one embodiment of the present invention, after controlling the outdoor fan to switch to the target speed, the control method of the air conditioner further includes: acquiring the current air loss pressure difference of the outdoor heat exchanger; when the current air loss pressure difference is less than a preset threshold, controlling the outdoor fan to operate at the target speed unchanged; when the current air loss pressure difference is greater than or equal to the preset threshold, controlling the air conditioner to enter the defrosting mode. The preset threshold can be determined according to actual conditions; for example, the preset threshold can be between 80 Pa and 100 Pa.

[0049] Specifically, after switching the outdoor fan from its maximum allowable speed to the target speed, the current air loss pressure difference of the outdoor heat exchanger is obtained. This current air loss pressure difference is compared with a preset threshold. If the current air loss pressure difference is less than the preset threshold (e.g., less than 80 Pa), the outdoor fan can be controlled to operate at the target speed. If the current air loss pressure difference is greater than or equal to the preset threshold (e.g., greater than or equal to 100 Pa), frost begins to form on the water bridge section, and the frost layer accumulates and thickens. Figure 2 As shown, at 120 minutes, the wind loss pressure difference is 100 Pa, which can control the air conditioner to enter the defrost mode for defrosting.

[0050] According to one embodiment of the present invention, the control method of the air conditioner further includes: when the rate of change of wind loss pressure difference in the current preset time interval is greater than or equal to the rate of change of wind loss pressure difference in the previous preset time interval, controlling the outdoor fan to operate at the target speed.

[0051] Specifically, the wind loss pressure difference change rate K2 of the current preset time interval is compared with the wind loss pressure difference change rate K1 of the previous preset time interval. When the wind loss pressure difference change rate K2 of the current preset time interval is greater than or equal to the wind loss pressure difference change rate K1 of the previous preset time interval, it indicates that the liquid droplets on the outdoor heat exchanger are still growing and the frosting process is in the first stage. The outdoor fan can be controlled to run at the target speed.

[0052] In summary, by installing a differential pressure sensor on the outdoor heat exchanger to monitor the pressure difference across the two ends of the heat exchanger, and calculating the rate of change of wind loss differential pressure based on the obtained differential pressure, the turning point at which frosting begins to worsen can be determined based on the rate of change of wind loss differential pressure during the frosting process. Intervention and control can then be applied through the outdoor fan to disrupt the frosting process of the outdoor heat exchanger, further delaying frosting. This method has a good effect on delaying frosting of the outdoor unit heat exchanger.

[0053] The following is combined with Figure 5 The control method of the present invention will be described below.

[0054] As a specific example, the control method of the air conditioner of the present invention may include the following steps:

[0055] S101, the air conditioner is in heating mode.

[0056] S102 controls the outdoor fan to run at the target speed.

[0057] S103, the air conditioner's heating operation time has reached the first preset time.

[0058] S104, obtain the wind loss pressure difference on both sides of the outdoor heat exchanger, and calculate the rate of change of wind loss pressure difference in adjacent preset time intervals.

[0059] S105, record the rate of change of wind loss pressure difference within the current preset time interval as K2, and record the rate of change of wind loss pressure difference within the previous preset time interval as K1.

[0060] S106, Determine if K2 is greater than or equal to K1. If yes, proceed to step S102; otherwise, proceed to step S107.

[0061] S107 controls the outdoor fan to operate at the maximum permissible speed.

[0062] S108, continue to obtain the differential pressure change rate and determine whether K2 is greater than K1. If yes, proceed to step S109; if no, proceed to step S107.

[0063] S109 controls the outdoor fan to switch to the target speed and obtains the current air loss pressure difference of the outdoor heat exchanger.

[0064] S110, determine whether the current wind loss pressure difference is less than the preset threshold. If yes, proceed to step S109; if no, proceed to step S111.

[0065] S111 controls the air conditioner to enter defrost mode.

[0066] In summary, the air conditioner control method according to embodiments of the present invention responds to the air conditioner's heating start command, controls the outdoor fan to operate at a target speed, and when the air conditioner's heating operation time reaches a first preset time, acquires the rate of change of wind loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals, wherein the wind loss pressure difference indicates the pressure difference between the windward and leeward sides of the outdoor heat exchanger. When the rate of change of wind loss pressure difference in the current preset time interval is less than the rate of change of wind loss pressure difference in the previous preset time interval, controls the outdoor fan to operate at a preset speed, wherein the preset speed is greater than the target speed. Therefore, this method, by applying a disturbance to the outdoor fan speed during the frosting process when the air conditioner is heating, can delay the frosting process of the air conditioner, thereby solving the problem of frequent frosting and defrosting during the air conditioner's heating operation, which leads to large fluctuations in indoor temperature and poor thermal comfort.

[0067] Corresponding to the above embodiments, the present invention also proposes a control device for an air conditioner.

[0068] like Figure 6 As shown, the control device 100 for an air conditioner proposed in this embodiment of the invention includes a control module 110 and an acquisition module 120.

[0069] The control module 110 responds to the air conditioner's heating start command and controls the outdoor fan to operate at a target speed. The acquisition module 120 acquires the rate of change of wind loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals when the air conditioner's heating operation time reaches a first preset time. The wind loss pressure difference indicates the pressure difference between the windward and leeward sides of the outdoor heat exchanger. The control module 110 also controls the outdoor fan to operate at a preset speed, where the preset speed is greater than the target speed, when the rate of change of wind loss pressure difference in the current preset time interval is less than the rate of change in wind loss pressure difference in the previous preset time interval.

[0070] According to one embodiment of the present invention, after the control module 110 controls the outdoor fan to run at a preset speed, it is further configured to: obtain the rate of change of wind loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals; if the rate of change of wind loss pressure difference in the current preset time interval is less than or equal to the rate of change of wind loss pressure difference in the previous preset time interval, then control the outdoor fan to run at the preset speed unchanged.

[0071] According to one embodiment of the present invention, the control module 110 is further configured to: if the rate of change of wind loss pressure difference in the current preset time interval is greater than the rate of change of wind loss pressure difference in the previous preset time interval, control the outdoor fan to switch to the target speed operation.

[0072] According to one embodiment of the present invention, after controlling the outdoor fan to switch to the target speed, the control module 110 is further configured to: obtain the current air loss pressure difference of the outdoor heat exchanger; when the current air loss pressure difference is less than a preset threshold, control the outdoor fan to operate at the target speed unchanged; when the current air loss pressure difference is greater than or equal to the preset threshold, control the air conditioner to enter the defrosting mode.

[0073] According to one embodiment of the present invention, the control module 110 is further configured to: control the outdoor fan to operate at the target speed when the rate of change of wind loss pressure difference in the current preset time interval is greater than or equal to the rate of change of wind loss pressure difference in the previous preset time interval.

[0074] According to one embodiment of the present invention, the preset rotational speed is the maximum allowable rotational speed of the outdoor fan.

[0075] According to one embodiment of the present invention, the first preset time is 10 min to 15 min, and the preset time interval is 2 min to 4 min.

[0076] It should be noted that for details not disclosed in the control device of the air conditioner in this embodiment of the invention, please refer to the details disclosed in the control method of the air conditioner in this embodiment of the invention, which will not be repeated here.

[0077] According to an embodiment of the present invention, the control device for an air conditioner includes a control module that responds to the air conditioner's heating start command and controls the outdoor fan to operate at a target speed. An acquisition module is used to acquire the rate of change of wind loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals when the air conditioner's heating operation time reaches a first preset time. The wind loss pressure difference indicates the pressure difference between the windward and leeward sides of the outdoor heat exchanger. The control module is also used to control the outdoor fan to operate at a preset speed when the rate of change of wind loss pressure difference in the current preset time interval is less than that in the previous preset time interval. The preset speed is greater than the target speed. Therefore, by applying a disturbance to the outdoor fan speed during the frosting process when the air conditioner is heating, this device can delay the frosting process of the air conditioner, thereby solving the problem of frequent frosting and defrosting during heating, which leads to large fluctuations in indoor temperature and poor thermal comfort.

[0078] Corresponding to the above embodiments, the present invention also proposes a computer-readable storage medium.

[0079] The computer-readable storage medium of this invention stores a control program for an air conditioner, which, when executed by a processor, implements the aforementioned control method for the air conditioner.

[0080] According to the computer-readable storage medium of the present invention, by executing the above-described air conditioner control method, the frosting process of the air conditioner can be delayed, thereby solving the problem of frequent frosting and defrosting during the heating operation of the air conditioner, which leads to large fluctuations in indoor temperature and poor thermal comfort.

[0081] Corresponding to the above embodiments, the present invention also proposes an air conditioner.

[0082] like Figure 7 As shown, the air conditioner 200 of this embodiment may include: a memory 210, a processor 220, and an air conditioner control program stored in the memory 210 and executable on the processor 220. When the processor 220 executes the air conditioner control program, it implements the above-mentioned air conditioner control method.

[0083] According to the air conditioner of the present invention, by executing the above-described air conditioner control method, the frosting process of the air conditioner can be delayed, thereby solving the problem of frequent frosting and defrosting during the heating operation of the air conditioner, which leads to large fluctuations in indoor temperature and poor thermal comfort.

[0084] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0085] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0086] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0088] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0089] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, include: In response to the heating start command of the air conditioner, the outdoor fan is controlled to run at the target speed; When the heating operation time of the air conditioner reaches the first preset time, the change rate of wind loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals is obtained respectively, wherein the wind loss pressure difference indicates the pressure difference between the windward side and the leeward side of the outdoor heat exchanger. When the rate of change of wind loss pressure difference in the current preset time interval is less than the rate of change of wind loss pressure difference in the previous preset time interval, the outdoor fan is controlled to operate at a preset speed, wherein the preset speed is greater than the target speed.

2. The method according to claim 1, characterized in that, After controlling the outdoor fan to operate at a preset speed, the method further includes: The rate of change of wind loss pressure difference of the outdoor heat exchanger at adjacent preset time intervals is obtained respectively; If the rate of change of wind loss pressure difference in the current preset time interval is less than or equal to the rate of change of wind loss pressure difference in the previous preset time interval, then the outdoor fan is controlled to operate at a preset speed.

3. The method according to claim 2, characterized in that, If the rate of change of wind loss pressure difference in the current preset time interval is greater than the rate of change of wind loss pressure difference in the previous preset time interval, then the outdoor fan is controlled to switch to the target speed.

4. The method according to claim 3, characterized in that, After controlling the outdoor fan to switch to the target speed, the method further includes: Obtain the current wind loss pressure difference of the outdoor heat exchanger; When the current wind loss pressure difference is less than a preset threshold, the outdoor fan is controlled to operate at the target speed without change. When the current wind loss pressure difference is greater than or equal to the preset threshold, the air conditioner is controlled to enter defrost mode.

5. The method according to claim 1, characterized in that, Also includes: When the rate of change of wind loss pressure difference in the current preset time interval is greater than or equal to the rate of change of wind loss pressure difference in the previous preset time interval, the outdoor fan is controlled to operate at the target speed.

6. The method according to claim 1, characterized in that, The preset speed is the maximum allowable speed of the outdoor fan.

7. The method according to claim 1, characterized in that, The first preset time is 10 min to 15 min, and the preset time interval is 2 min to 4 min.

8. A control device for an air conditioner, characterized in that, include: The control module is used to respond to the heating start command of the air conditioner and control the outdoor fan to run at the target speed; The acquisition module is used to acquire the rate of change of wind loss pressure difference of the outdoor heat exchanger in adjacent preset time intervals when the heating operation time of the air conditioner reaches a first preset time, wherein the wind loss pressure difference indicates the pressure difference between the windward and leeward sides of the outdoor heat exchanger. The control module is further configured to control the outdoor fan to operate at a preset speed when the rate of change of wind loss pressure difference in the current preset time interval is less than the rate of change of wind loss pressure difference in the previous preset time interval, wherein the preset speed is greater than the target speed.

9. A computer-readable storage medium, characterized in that, It stores the control program of the air conditioner, which, when executed by the processor, implements the control method of the air conditioner according to any one of claims 1-7.

10. An air conditioner, characterized in that, The device includes a memory, a processor, and a control program for an air conditioner stored in the memory and executable on the processor. When the processor executes the control program for the air conditioner, it implements the control method for the air conditioner according to any one of claims 1-7.

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