Air conditioner and self-cleaning control method and device thereof, storage medium and program product

Abstract

The invention provides an air conditioner and a self-cleaning control method and device thereof, a storage medium and a program product. A self-cleaning defrosting stage sequentially comprises a first defrosting stage, a second defrosting stage and a third defrosting stage; the method comprises the steps that in the first stage, if it is detected that the indoor environment temperature is smaller than the sum of a first preset pipe temperature value and a preset pipe temperature margin value, an inner fan operates according to a first set rotating speed, an up-down air guide plate stays at a first preset position, a left-right air guide plate stays at the position with the maximum air outlet volume, and the frequency of a compressor is increased to a first preset frequency value; the opening degree of the throttling device is operated according to a first preset opening degree; in the second stage, the inner fan operates according to a second set rotating speed, the frequency of the compressor is increased to a second preset frequency value, and the opening degree of the throttling device operates according to a second preset opening degree; and in the third stage, the inner fan operates according to a third set rotating speed, the frequency of the compressor is increased to a third preset frequency value, and the throttling device operates according to a third preset opening degree. According to the scheme, generation of a large amount of condensate water can be avoided.

Description

Technical Field

[0001] This invention relates to the field of control, and more particularly to an air conditioner and its self-cleaning control method, apparatus, storage medium, and program product. Background Technology

[0002] In related technologies, the self-cleaning function of the indoor heat exchanger (evaporator) of a household air conditioner is divided into four stages: condensation, frosting, defrosting, and drying. At the beginning of the frosting stage, a large layer of frost forms on the evaporator surface. Simultaneously, due to the condensation process, a large amount of condensate is generated. Some of this condensate is drained away, some remains on the drip tray at the bottom of the evaporator, and some adheres to the evaporator surface. Once the frosting stage begins, the evaporator surface temperature drops sharply, and the condensate on the drip tray turns into ice. A large amount of ice also forms on the evaporator surface and at the bottom, especially at the bottom where the ice layer is thicker and more abundant.

[0003] During defrosting, the surface temperature of the evaporator rises, and the frost and fine ice on the surface melt quickly, with water flowing down from the evaporator. However, the ice layer at the bottom is thicker and farther away from the hotter area of ​​the evaporator, so it takes longer for the ice to melt completely. At this time, the ice layer at the bottom of the evaporator blocks the rapid flow of melted water, causing some melted water to overflow from the drip tray and then flow out from the shell, affecting the indoor environment. Summary of the Invention

[0004] The main objective of this invention is to overcome the deficiencies of the aforementioned related technologies and provide an air conditioner and its self-cleaning control method, device, storage medium, and program product to solve the problem of water overflow in the drip tray during the self-cleaning defrosting stage in the related technologies.

[0005] This invention provides a self-cleaning control method for an air conditioner. The defrosting stage of the self-cleaning process includes three stages: a first defrosting stage, a second defrosting stage, and a third defrosting stage. The self-cleaning control method includes: in the first defrosting stage, if the detected indoor ambient temperature is less than the sum of a first preset pipe temperature value and a preset pipe temperature margin value, controlling the indoor fan to operate at a first set speed, controlling the upper and lower air guide vanes to remain at a first preset position, controlling the left and right air guide vanes to remain at the position with the maximum airflow, controlling the compressor frequency to increase to a first preset frequency value, and controlling the opening of the throttling device to operate at a first preset opening degree; in the second defrosting stage, controlling the indoor fan to operate at a second preset speed... During the first stage of defrosting, the compressor frequency is increased to a second preset frequency value, and the opening of the throttling device is controlled to operate at a second preset opening degree. During the third stage of defrosting, the internal fan is controlled to operate at a third preset speed, the compressor frequency is increased to a third preset frequency value, and the opening of the throttling device is controlled to operate at a third preset opening degree. The first preset speed is greater than the second preset speed, and the second preset speed is greater than the third preset speed. The first preset frequency value is less than the second preset frequency value, and the second preset frequency value is less than the third preset frequency value. The first preset opening degree is less than the second preset opening degree, and the second preset opening degree is less than the third preset opening degree.

[0006] Optionally, it also includes: in the first stage of defrosting, if the detected indoor ambient temperature is greater than or equal to the sum of the first preset pipe temperature value and the preset pipe temperature margin value, then control the indoor fan to run at the first set speed, control the upper and lower air guide plates to stay at the first preset position, and control the left and right air guide plates to stay at the position with the maximum air volume.

[0007] Optionally, it further includes: in the first defrosting stage, after controlling the compressor frequency to rise to a first preset frequency value for a preset time, controlling the opening degree of the air conditioner's throttling device according to the outdoor heat exchanger pipe temperature; and / or, in the second defrosting stage, after controlling the compressor frequency to rise to a second preset frequency value for a preset time, controlling the indoor fan speed and / or the air guide plate position of the air conditioner according to the indoor relative humidity, and / or, controlling the opening degree of the air conditioner's throttling device according to the outdoor heat exchanger pipe temperature; and / or, in the third defrosting stage, after controlling the compressor frequency to rise to a third preset frequency value for a preset time, controlling the indoor fan speed and / or the air guide plate position of the air conditioner according to the indoor relative humidity, and / or, controlling the opening degree of the air conditioner's throttling device according to the outdoor heat exchanger pipe temperature.

[0008] Optionally, in the first defrosting stage, the opening degree of the throttling device of the air conditioner is controlled according to the outdoor heat exchanger pipe temperature, including: detecting whether the outdoor heat exchanger pipe temperature is greater than the sum of a first preset pipe temperature value and a preset pipe temperature fluctuation value; if so, the opening degree of the throttling device is increased at a preset rate until the outdoor heat exchanger pipe temperature is equal to the sum of the first preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is less than the sum of the first preset pipe temperature value and the preset pipe temperature fluctuation value, the outdoor heat exchanger pipe temperature is detected as less than the difference between the first preset pipe temperature value and the preset pipe temperature fluctuation value; if so, the opening degree of the throttling device is decreased at a preset rate until the outdoor heat exchanger pipe temperature is equal to the difference between the first preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is greater than or equal to the difference between the first preset pipe temperature value and the preset pipe temperature fluctuation value, the second defrosting stage begins after the time from compressor frequency increase to frequency constant reaches time t1.

[0009] Optionally, in the second defrosting stage, the speed of the indoor fan and / or the position of the air guide vanes of the air conditioner are controlled according to the current indoor relative humidity, including: detecting whether the current indoor relative humidity is greater than a first preset humidity value; if so, controlling the indoor fan to periodically switch between a first set speed and a second set speed, controlling the upper and lower air guide vanes to perform vertical air sweeping, and the left and right air guide vanes to perform horizontal air sweeping; if the current indoor relative humidity is less than or equal to the first preset humidity value, detecting whether the current indoor relative humidity is less than the second preset humidity value; if so, controlling the indoor fan to run at a third set speed, controlling the upper and lower air guide vanes to remain at the position with the minimum airflow, and keeping the positions of the left and right air guide vanes unchanged; if the current indoor relative humidity is greater than or equal to the second preset humidity value, the speed of the indoor fan and the position of the air guide vanes remain unchanged, and after running for t2 time, entering the third defrosting stage; and / or;

[0010] In the second stage of defrosting, based on the current outdoor heat exchanger pipe temperature, the opening of the air conditioner's throttling device is controlled, including: detecting whether the outdoor heat exchanger pipe temperature is greater than the sum of a second preset pipe temperature value and a preset pipe temperature fluctuation value; if so, the opening of the throttling device is increased at a preset rate until the outdoor heat exchanger pipe temperature equals the sum of the second preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is detected to be less than the sum of the second preset pipe temperature value and the preset pipe temperature fluctuation value, then the outdoor heat exchanger pipe temperature is detected to be less than the difference between the second preset pipe temperature value and the preset pipe temperature fluctuation value; if so, the opening of the throttling device is decreased at a preset rate until the outdoor heat exchanger pipe temperature equals the difference between the second preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is detected to be greater than or equal to the difference between the second preset pipe temperature value and the preset pipe temperature fluctuation value, then after the time from compressor frequency increase to frequency constant reaches time t2, the third stage of defrosting begins.

[0011] Optionally, in the third stage of defrosting, the speed of the indoor fan and / or the position of the air guide vanes of the air conditioner are controlled according to the relative humidity of the indoor environment, including: detecting whether the current relative humidity of the indoor environment is greater than a first preset humidity value; if so, controlling the indoor fan to periodically switch between a second set speed and a third set speed, controlling the upper and lower air guide vanes to perform vertical air sweeping, and the left and right air guide vanes to perform horizontal air sweeping; if the current relative humidity of the indoor environment is less than or equal to the first preset humidity value, detecting whether the current relative humidity of the indoor environment is less than the second preset humidity value; if so, controlling the indoor fan to run at a fourth set speed, controlling the upper and lower air guide vanes to stay at the position with the minimum airflow, and the positions of the left and right air guide vanes remaining unchanged; if the current relative humidity of the indoor environment is greater than or equal to the second preset humidity value, the speed of the indoor fan and the position of the air guide vanes remain unchanged, and defrosting ends after running for t3 time; and / or; in the defrosting... In the third stage of defrosting, based on the outdoor heat exchanger pipe temperature, the opening of the air conditioner's throttling device is controlled. This includes: detecting whether the outdoor heat exchanger pipe temperature is greater than the sum of a third preset pipe temperature value and a preset pipe temperature fluctuation value; if so, the opening of the throttling device is increased at a preset rate until the outdoor heat exchanger pipe temperature equals the sum of the third preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is less than the sum of the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value, then the outdoor heat exchanger pipe temperature is detected as less than the difference between the third preset pipe temperature value and the preset pipe temperature fluctuation value; if so, the opening of the throttling device is decreased at a preset rate until the outdoor heat exchanger pipe temperature equals the difference between the third preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is greater than or equal to the difference between the third preset pipe temperature value and the preset pipe temperature fluctuation value, defrosting ends after the time from compressor frequency increase to frequency constant reaches time t3.

[0012] In another aspect, the present invention provides a self-cleaning control device for an air conditioner. The defrosting stages of the self-cleaning process of the air conditioner sequentially include: a first defrosting stage, a second defrosting stage, and a third defrosting stage. The self-cleaning control device includes: a first control unit, used in the first defrosting stage, if the detected indoor ambient temperature is less than the sum of a first preset pipe temperature value and a preset pipe temperature margin value, to control the indoor fan to run at a first set speed, control the upper and lower air guide vanes to remain at a first preset position, control the left and right air guide vanes to remain at the position with the maximum airflow, control the compressor frequency to increase to a first preset frequency value, and control the opening degree of the throttling device to run at a first preset opening degree; a second control unit, used in the second defrosting stage, to control the indoor fan to run at a second set speed, and control... The compressor frequency increases to a second preset frequency value, and the opening of the throttling device is controlled to operate at the second preset opening degree; the third control unit is used to control the internal fan to operate at a third set speed during the third defrosting stage, control the compressor frequency to increase to a third preset frequency value, and control the opening of the throttling device to operate at the third preset opening degree; the first set speed is greater than the second set speed, and the second set speed is greater than the third set speed; the first preset frequency value is less than the second preset frequency value, and the second preset frequency value is less than the third preset frequency value; the first preset opening degree is less than the second preset opening degree, and the second preset opening degree is less than the third preset opening degree.

[0013] Optionally, the first control unit is further configured to: in the first defrosting stage, if the detected indoor ambient temperature is greater than or equal to the sum of the first preset pipe temperature value and the preset pipe temperature margin value, control the indoor fan to run at the first set speed, control the upper and lower air guide plates to stay at the first preset position, and control the left and right air guide plates to stay at the position with the maximum air volume.

[0014] Optionally, the first control unit is further configured to: in the first defrosting stage, after controlling the compressor frequency to rise to a first preset frequency value for a preset time, control the opening degree of the air conditioner's throttling device according to the outdoor heat exchanger pipe temperature; and / or, the second control unit is further configured to: in the second defrosting stage, after controlling the compressor frequency to rise to a second preset frequency value for a preset time, control the speed of the air conditioner's indoor fan and / or the position of the air guide plate according to the indoor relative humidity, and / or, control the opening degree of the air conditioner's throttling device according to the outdoor heat exchanger pipe temperature; and / or, the third control unit is further configured to: in the third defrosting stage, after controlling the compressor frequency to rise to a third preset frequency value for a preset time, control the speed of the air conditioner's indoor fan and / or the position of the air guide plate according to the indoor relative humidity, and / or, control the opening degree of the air conditioner's throttling device according to the outdoor heat exchanger pipe temperature.

[0015] Optionally, in the first defrosting stage, the first control unit controls the opening degree of the air conditioner's throttling device based on the outdoor heat exchanger pipe temperature, including: detecting whether the outdoor heat exchanger pipe temperature is greater than the sum of a first preset pipe temperature value and a preset pipe temperature fluctuation value; if so, controlling the opening degree of the throttling device to increase at a preset rate until the outdoor heat exchanger pipe temperature equals the sum of the first preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is less than the sum of the first preset pipe temperature value and the preset pipe temperature fluctuation value, then detecting whether the outdoor heat exchanger pipe temperature is less than the difference between the first preset pipe temperature value and the preset pipe temperature fluctuation value; if so, controlling the opening degree of the throttling device to decrease at a preset rate until the outdoor heat exchanger pipe temperature equals the difference between the first preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is greater than or equal to the difference between the first preset pipe temperature value and the preset pipe temperature fluctuation value, then after the time from compressor frequency increase to frequency constant reaches time t1, the system enters the second defrosting stage.

[0016] Optionally, in the second defrosting stage, the second control unit controls the indoor fan speed and / or the air guide plate position of the air conditioner according to the current indoor relative humidity, including: detecting whether the current indoor relative humidity is greater than a first preset humidity value; if so, controlling the indoor fan to periodically switch between a first set speed and a second set speed, controlling the upper and lower air guide plates to perform vertical air sweeping, and the left and right air guide plates to perform horizontal air sweeping; if the current indoor relative humidity is less than or equal to the first preset humidity value, detecting whether the current indoor relative humidity is less than the second preset humidity value; if so, controlling the indoor fan to run at a third set speed, controlling the upper and lower air guide plates to remain at the minimum airflow position, and keeping the left and right air guide plate positions unchanged; if the current indoor relative humidity is greater than or equal to the second preset humidity value, the indoor fan speed and air guide plate positions remain unchanged, and after running for time t2, entering the third defrosting stage; and / or; The second control unit, in the second defrosting stage, controls the opening degree of the air conditioner's throttling device based on the current outdoor heat exchanger pipe temperature, including: detecting whether the outdoor heat exchanger pipe temperature is greater than the sum of a second preset pipe temperature value and a preset pipe temperature fluctuation value; if so, controlling the opening degree of the throttling device to increase at a preset rate until the outdoor heat exchanger pipe temperature equals the sum of the second preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is detected to be less than the sum of the second preset pipe temperature value and the preset pipe temperature fluctuation value, then detecting whether the outdoor heat exchanger pipe temperature is less than the difference between the second preset pipe temperature value and the preset pipe temperature fluctuation value; if so, controlling the opening degree of the throttling device to decrease at a preset rate until the outdoor heat exchanger pipe temperature equals the difference between the second preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is detected to be greater than or equal to the difference between the second preset pipe temperature value and the preset pipe temperature fluctuation value, then after the time from compressor frequency increase to frequency constant reaches time t2, entering the third defrosting stage.

[0017] Optionally, the third control unit, in the third stage of defrosting, controls the speed of the indoor fan and / or the position of the air guide vanes of the air conditioner according to the relative humidity of the indoor environment, including: detecting whether the current relative humidity of the indoor environment is greater than a first preset humidity value; if so, controlling the indoor fan to periodically switch between a second set speed and a third set speed, controlling the upper and lower air guide vanes to perform vertical air sweeping, and the left and right air guide vanes to perform horizontal air sweeping; if the current relative humidity of the indoor environment is less than or equal to the first preset humidity value, detecting whether the current relative humidity of the indoor environment is less than the second preset humidity value; if so, controlling the indoor fan to run at a fourth set speed, controlling the upper and lower air guide vanes to remain at the position with the minimum airflow, and keeping the positions of the left and right air guide vanes unchanged; if the current relative humidity of the indoor environment is greater than or equal to the second preset humidity value, the speed of the indoor fan and the position of the air guide vanes remain unchanged, and after running for t3 time, the defrosting ends; and / or; The third control unit, in the third stage of defrosting, controls the opening degree of the air conditioner's throttling device based on the outdoor heat exchanger pipe temperature, including: detecting whether the outdoor heat exchanger pipe temperature is greater than the sum of a third preset pipe temperature value and a preset pipe temperature fluctuation value; if so, controlling the opening degree of the throttling device to increase at a preset rate until the outdoor heat exchanger pipe temperature equals the sum of the third preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is detected to be less than the sum of the third preset pipe temperature value and the preset pipe temperature fluctuation value, then detecting whether the outdoor heat exchanger pipe temperature is less than the difference between the third preset pipe temperature value and the preset pipe temperature fluctuation value; if so, controlling the opening degree of the throttling device to decrease at a preset rate until the outdoor heat exchanger pipe temperature equals the difference between the third preset pipe temperature value and the preset pipe temperature fluctuation value; if the outdoor heat exchanger pipe temperature is detected to be greater than or equal to the difference between the third preset pipe temperature value and the preset pipe temperature fluctuation value, then after the time from compressor frequency increase to frequency constant reaches time t3, defrosting ends.

[0018] In another aspect, the present invention provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0019] In another aspect, the present invention provides an air conditioner, including a processor, a memory, and a computer program stored in the memory that can run on the processor, wherein the processor executes the program to implement the steps of any of the methods described above.

[0020] In another aspect, the present invention provides an air conditioner including any of the aforementioned self-cleaning control devices.

[0021] In another aspect, the present invention provides a computer program product, including a computer program that, when executed by a processor, implements the steps of any of the methods described above.

[0022] According to the technical solution of the present invention, the defrosting stage of indoor self-cleaning is divided into three stages. By controlling the speed of the indoor fan, the air guide plate, the compressor and the electronic expansion valve, the temperature of the evaporator surface is gradually increased, avoiding the generation of a large amount of condensate and solving the problem of defrosting overflow.

[0023] According to the technical solution of the present invention, a large amount of water vapor is generated during the defrosting stage. The relative humidity of the indoor environment is detected, and the water vapor discharge is increased or decreased by adjusting the speed of the indoor fan and the air guide plate, so as to keep the relative humidity of the indoor environment within a comfortable range. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 This is a schematic diagram of an embodiment of the self-cleaning control method for air conditioners provided by the present invention;

[0026] Figure 2 A schematic diagram showing the stopping positions of the upper and lower air guide plates of the air conditioner is shown;

[0027] Figure 3 The diagram shows the preset values ​​and time variations of the outdoor heat exchanger tube temperature during the three defrosting stages of this invention.

[0028] Figure 4 This is a schematic diagram of a specific embodiment of the self-cleaning control method for air conditioners provided by the present invention;

[0029] Figure 5 This is a schematic diagram of a preferred embodiment of the self-cleaning control method for air conditioners provided by the present invention;

[0030] Figure 6 This is a structural block diagram of an embodiment of the self-cleaning control device for air conditioners provided by the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] In related technologies, the self-cleaning function of the indoor heat exchanger (evaporator) of a household air conditioner is divided into four stages: condensation, frosting, defrosting, and drying. Condensation stage: A large amount of condensation adheres to the surface of the indoor evaporator; Frosting stage: The condensation freezes and water vapor in the air directly frosts the evaporator surface; Defrosting stage: The evaporator heats up rapidly, causing the frost on the evaporator surface to melt quickly and remove dust; Drying stage: The evaporator surface has relatively little moisture, and the pipe temperature rises to a certain level, sterilizing the evaporator at high temperature.

[0034] During the initial frosting stage, a large layer of frost forms on the evaporator surface, along with a significant amount of ice on both the surface and bottom of the evaporator, especially at the bottom where the ice layer is thicker and more abundant. During defrosting, the evaporator surface temperature rises, causing the frost and fine ice to melt rapidly, and water flows down the evaporator. However, the ice layer at the bottom is thicker and farther from the warmer areas of the evaporator, taking longer to melt completely. This ice layer at the bottom obstructs the rapid flow of melted water, causing some to overflow from the drip tray and eventually leak from the casing, affecting the indoor environment.

[0035] This invention provides a self-cleaning control method for an air conditioner. The defrosting stage of the self-cleaning process of the air conditioner sequentially includes: a first defrosting stage, a second defrosting stage, and a third defrosting stage.

[0036] Figure 1 This is a schematic diagram of an embodiment of the self-cleaning control method for air conditioners provided by the present invention.

[0037] like Figure 1 As shown, according to an embodiment of the present invention, the control method includes at least steps S110, S120, S130 and S140.

[0038] Step S110, in the first stage of defrosting, if the indoor ambient temperature T is detected... 环If the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1 is greater than or equal to the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1, then the internal fan is controlled to run at the first set speed, the upper and lower air guide plates are controlled to stay at the first preset position, the left and right air guide plates are controlled to stay at the position with the maximum air volume, the compressor frequency is controlled to increase to the first preset frequency value N1, and the opening degree of the throttling device (e.g., an electronic expansion valve) is controlled to run at the first preset opening degree P1.

[0039] Specifically, after entering the defrosting stage, the first defrosting stage is first carried out. During the first defrosting stage, the current indoor ambient temperature T is detected. 环 Is it greater than or equal to the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1? Wherein, if the current indoor ambient temperature T is detected... 环 If the temperature is greater than or equal to the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1, then the indoor fan is controlled to run at the first set speed (e.g., high speed), the upper and lower air guides are controlled to stay at the first preset position (e.g., the non-blowing position), and the left and right air guides are controlled to stay at the position with the maximum airflow. After running for time t0, the second defrosting stage begins. If the indoor ambient temperature T is detected... 环 If the temperature is less than the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1, then the internal fan is controlled to run at the first set speed (e.g., high speed), the upper and lower air guides are controlled to stay at the first preset position (non-blowing position), the left and right air guides are controlled to stay at the position with the maximum air volume, the compressor frequency is controlled to increase to the first preset frequency value N1, and the opening of the throttling device (e.g., electronic expansion valve) is controlled to run at the first preset opening P1.

[0040] More specifically, if the current indoor ambient temperature T is detected... 环 If the temperature is greater than or equal to the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1, it indicates that the indoor ambient temperature is high. The heat of the air can be used to melt the frost or ice layer on the evaporator surface. In this case, the indoor fan can be set to a high speed to accelerate air circulation, and the upper and lower air guides should be positioned so as not to blow air into people. For example... Figure 2 A schematic diagram showing the stopping positions of the upper and lower air guide vanes of an air conditioner is provided. Figure 2 As shown, five preset stopping positions are defined by angles L1, L2, L3, L4, and L5, where L1 < L2 < L3 < L4 < L5. The upper and lower air guides can stop at position L2, which is the position where the airflow does not blow directly on people. The left and right air guides stop at the position with the maximum airflow, specifically, the positions where the left and right air guides are perpendicular to the plane of the air outlet.

[0041] If the current indoor ambient temperature T is detected 环If the temperature is less than the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1, then the internal fan is controlled to run at the first set speed (high speed), the upper and lower air guides are controlled to stay at the first preset position (non-blowing position), the left and right air guides are controlled to stay at the position with the maximum air volume, the compressor frequency is controlled to increase to the first preset frequency value N1, and the opening of the throttling device (e.g., the valve step of the electronic expansion valve) is controlled to run at the first preset opening P1.

[0042] Furthermore, after the compressor frequency is increased to the first preset frequency value N1 for a preset time, the opening degree of the throttling device of the air conditioner is controlled according to the outdoor heat exchanger tube temperature.

[0043] In one specific implementation, during the first stage of defrosting, the opening degree of the air conditioner's throttling device is controlled based on the outdoor heat exchanger pipe temperature. Specifically, this may include: detecting the outdoor heat exchanger pipe temperature T. 管 Is the temperature greater than the sum of the first preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2? If so, control the opening of the throttling device to increase at a preset rate until the outdoor heat exchanger pipe temperature T... 管 The temperature is equal to the sum of the first preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2. When the time from compressor frequency increase to frequency stability reaches time t1 (i.e., t≥t1), the second defrosting stage begins. If the outdoor heat exchanger pipe temperature T is detected... 管 If the outdoor heat exchanger tube temperature T is less than the sum of the first preset tube temperature value T1 and the preset tube temperature fluctuation value ΔT2, then the outdoor heat exchanger tube temperature T is detected. 管 If the temperature is less than the difference between the first preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2, then the opening of the throttling device is controlled to decrease at a preset rate until the outdoor heat exchanger pipe temperature T... 管 The difference between the first preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2 is equal to the time t1 after the compressor frequency increases to a constant frequency (i.e., t≥t1). The second defrosting stage begins when the time from frequency increase to constant frequency reaches t1. If the outdoor heat exchanger pipe temperature T is detected... 管 If the difference between the first preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2 is greater than or equal to the first preset pipe temperature value T1, then after the time from compressor frequency increase to frequency constant reaches time t1, the second defrosting stage begins.

[0044] For example, the indoor fan is running at high speed, the upper and lower air guides are at position L2, the compressor increases its frequency to N1, the electronic expansion valve opens at P1, and the outdoor heat exchanger tube temperature T is measured after time T'. 管 If the temperature fluctuation value is greater than the preset pipe temperature value T1 + pipe temperature fluctuation value ΔT2, then the opening degree P of the electronic expansion valve increases at a rate of ΔP per millisecond until T... 管 =T1+ΔT2, during this process, the outdoor heat exchanger tube temperature T is checked every m seconds. 管After the compressor reaches a constant frequency (t1 time), it enters the second stage; otherwise, the outdoor heat exchanger tube temperature (T) is detected. 管 If the temperature difference is less than the preset pipe temperature value T1 - pipe temperature fluctuation value ΔT2, then the electronic expansion valve P decreases at a rate of ΔP per m / s until T... 管 =T1-ΔT2, during this process, the outdoor heat exchanger tube temperature T is checked every m seconds. 管 If the compressor enters the second stage after a time t1 from frequency increase to constant frequency, then if neither of the above two situations applies, the compressor enters the second stage after a time t1 from frequency increase to constant frequency.

[0045] In step S120, during the second defrosting stage, the internal fan is controlled to run at the second set speed (medium speed), the compressor frequency is controlled to increase to the second preset frequency value N2, and the opening of the throttling device is controlled to run at the second preset opening P2.

[0046] As the frost and ice layers on the evaporator melt, a large amount of water vapor is gradually generated, which has both positive and negative impacts on the environment. If the indoor relative humidity is low, this water vapor can be used to humidify the environment and improve indoor comfort. If the indoor relative humidity is high, the release of water vapor should be minimized as much as possible to maintain the indoor relative humidity within a comfortable range.

[0047] After entering the second stage of defrosting, the indoor fan speed is adjusted to the second preset speed (e.g., medium speed), which is beneficial for raising the evaporator pipe temperature and avoids high-frequency compressor operation, thus achieving energy saving. The lower the indoor fan speed, the less easily the evaporator temperature dissipates in heating mode, making it easier for the evaporator temperature to rise (which is beneficial for defrosting). At the same time, the compressor frequency increases to the second preset frequency value N2, where the first preset frequency value N1 is less than the second preset frequency value N2. The opening of the throttling device (e.g., the valve step of the electronic expansion valve) is controlled to operate at the second preset opening P2, where the first preset opening P1 is less than the second preset opening P2.

[0048] After the compressor frequency is increased to the second preset frequency value for a preset time, the indoor fan speed and / or air guide plate position of the air conditioner are controlled according to the current indoor relative humidity. That is, after controlling the indoor fan to run at the second set speed (medium speed), controlling the compressor frequency to increase to the second preset frequency value N2, controlling the opening of the throttling device to run at the second preset opening P2, and after a preset time T', the indoor fan speed and / or air guide plate position of the air conditioner are controlled according to the current indoor relative humidity.

[0049] In one specific implementation, the current indoor relative humidity H is detected. 环If the relative humidity is greater than the first preset humidity value, then control the internal fan to periodically switch between the first and second preset speeds, control the upper and lower air guides to perform vertical air sweeping, and the left and right air guides to perform horizontal air sweeping. After running for time t2, enter the third stage of defrosting; if the current indoor relative humidity H is detected... 环 If the relative humidity is less than or equal to the first preset humidity value H1, then the current indoor relative humidity H is detected. 环 Is the relative humidity less than the second preset humidity value H2, and the first preset humidity value H1 is greater than the second preset humidity value H2? If yes, then control the internal fan to run at the third preset speed (e.g., low speed), control the upper and lower air guides to stay at the minimum airflow position (e.g., L1 position), and keep the left and right air guides in the same position. After running for t2 hours, enter the third stage of defrosting; if the current indoor relative humidity H is detected... 环 Greater than or equal to the second preset humidity value (H2≤H) 环 If ≤H1), the internal fan speed and the position of the air guide plate remain unchanged. After running for t2 hours, the third stage of defrosting begins.

[0050] Specifically, after entering the second stage of defrosting, the indoor fan speed is adjusted to medium speed, the compressor frequency is increased to N2, the electronic expansion valve opening is set to P2, and the indoor relative humidity H is monitored. 环 If the relative humidity is greater than the first preset humidity value H1, it indicates that the indoor relative humidity is high, and the air conditioner's water vapor emission should be reduced as much as possible. In this case, the fan speed should be periodically switched between high and medium speeds (e.g., according to a sine wave, cosine wave, or square wave pattern), and the air guide should be used for both vertical and horizontal airflow to reduce water vapor release. After running for time t2, the third stage of defrosting begins. If not, the indoor relative humidity H1 should be checked. 环 If the humidity is less than H2, it indicates that the indoor relative humidity is low. To increase the removal of water vapor, the indoor fan should be set to a low speed, and the upper and lower air guides should be set to the position with the minimum airflow (e.g., [missing information]). Figure 2 (At position L1), the positions of the left and right air guides remain unchanged. After running for time t2, the third stage of defrosting begins. If the humidity is between H1 and H2 (H2≤H2), the defrosting process continues. 环 If ≤H1), then the positions of the windshield and the air guide plate remain unchanged, and after running for t2 time, the third stage of defrosting begins.

[0051] In the second stage of defrosting, after the compressor frequency is increased to the second preset frequency value for a preset time, the opening of the throttling device of the air conditioner is controlled according to the outdoor heat exchanger pipe temperature. That is, the indoor fan is controlled to run at the second set speed (e.g., medium speed), the compressor frequency is controlled to increase to the second preset frequency value N2, and the opening of the throttling device is controlled to run at the second preset opening P2. After a preset time T', the opening of the throttling device of the air conditioner is controlled according to the current outdoor heat exchanger pipe temperature.

[0052] In one specific embodiment, after the compressor frequency is increased to a second preset frequency value for a preset time T' (T' is the time from when the compressor frequency increases to the second preset frequency value N2 until the outdoor heat exchanger tube temperature is detected), the outdoor heat exchanger tube temperature T is detected. 管 Is the first preset pipe temperature T1 greater than or equal to the sum of the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2, where the first preset pipe temperature value T1 is less than the second preset pipe temperature value T2? If so, the opening of the throttling device is controlled to increase at a preset rate until the outdoor heat exchanger pipe temperature T1 increases. 管 The temperature is equal to the sum of the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2. When the time from compressor frequency increase to frequency stability reaches time t2, the third stage of defrosting begins. If the outdoor heat exchanger pipe temperature T is detected... 管 If the outdoor heat exchanger tube temperature T is less than the sum of the second preset tube temperature value T2 and the preset tube temperature fluctuation value ΔT2, then the outdoor heat exchanger tube temperature T is detected. 管 If the temperature is less than the difference between the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2, then the opening of the throttling device is controlled to decrease at a preset rate until the outdoor heat exchanger pipe temperature T 管 The difference between the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2 is equal to the difference between the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2. After time t2 is reached from the compressor frequency increase to a constant frequency, the third stage of defrosting begins. If the outdoor heat exchanger pipe temperature T is detected... 管 Greater than or equal to the difference between the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2 (T2-ΔT2≤T 管 If <T2+ΔT2), then after the time from compressor frequency increase to constant frequency reaches time t2, the third stage of defrosting begins.

[0053] Specifically, when the compressor frequency is increased to N2, the electronic expansion valve operates at P2 opening, and the outdoor heat exchanger tube temperature T is measured after time T'. 管 If the temperature fluctuation value is greater than the preset pipe temperature T2 + pipe temperature fluctuation value ΔT2, then the electronic expansion valve P increases at a rate of ΔP per m / s until T... 管 =T2+ΔT2, during this process, the outdoor heat exchanger tube temperature T is checked every m seconds. 管 The compressor enters the third stage after a time t2 between frequency ramp-up and constant frequency; otherwise, the outdoor heat exchanger tube temperature T is detected. 管 If the temperature difference is less than the preset pipe temperature value T2 - pipe temperature fluctuation value ΔT2, then the electronic expansion valve P decreases at a rate of ΔP per m / s until T... 管 =T2-ΔT2, during this process, the outdoor heat exchanger tube temperature T is checked every m seconds. 管 The compressor enters the third stage after a time t2 between increasing and maintaining a constant frequency; if neither of the above two cases applies, i.e., T2 - ΔT2 ≤ T 管If <T2+ΔT2, then the compressor enters the third stage after a time t2 when it goes from increasing frequency to constant frequency.

[0054] In step S130, after entering the third stage of defrosting, the internal fan is controlled to run at the third set speed, the compressor frequency is controlled to rise to the third preset frequency value N3, and the opening of the throttling device is controlled to run at the third preset opening P3.

[0055] Specifically, after entering the third stage of defrosting, the internal fan speed is adjusted to the third set speed (e.g., low fan speed), which is conducive to the increase of evaporator pipe temperature, avoids high-frequency operation of the compressor, and achieves energy saving effect. At the same time, the compressor frequency is increased to the third preset frequency value N3, the second preset frequency value N2 is less than the third preset frequency value N3, and the electronic expansion valve operates according to the third preset opening P3, the second preset opening P2 is less than the third preset opening P3.

[0056] After the compressor frequency is increased to the third preset frequency value for a preset time, the speed of the indoor fan and / or the position of the air guide plate of the air conditioner are controlled according to the current indoor relative humidity. That is, the indoor fan is controlled to run at the third set speed, the compressor frequency is controlled to increase to the third preset frequency value N3, the opening degree of the throttling device is controlled to run at the third preset opening degree P3, and after a preset time T`, the speed of the indoor fan and / or the position of the air guide plate of the air conditioner are controlled according to the current indoor relative humidity.

[0057] In one specific implementation, the current indoor relative humidity H is detected. 环 If the relative humidity is greater than the first preset humidity value, then control the internal fan to periodically switch between the second and third preset speeds, control the upper and lower air guides to perform vertical air sweeping, and the left and right air guides to perform horizontal air sweeping. After running for t3 time, defrosting ends; if the current indoor relative humidity H is detected... 环 If the relative humidity is less than or equal to the first preset humidity value, then the current indoor relative humidity H is detected. 环 If the humidity is less than the second preset value, then control the internal fan to run at the fourth preset speed (silent mode), control the upper and lower air guides to stay at the minimum airflow position (e.g., L1 position), and keep the left and right air guides in the same position. After running for t3 time, defrosting ends; if the current indoor relative humidity H is detected... 环 Greater than or equal to the second preset humidity value (H2≤H) 环 If ≤H1), the internal fan speed and the position of the air guide plate remain unchanged, and defrosting ends after running for t3 time.

[0058] Specifically, after entering the third stage of defrosting, the indoor fan speed is adjusted to the third set speed (e.g., low fan speed), the compressor frequency is increased to N3, the electronic expansion valve opening is set to P3, and the indoor relative humidity H is detected.环 If the relative humidity is greater than H1, it indicates that the indoor relative humidity is high. Minimize the release of water vapor from the air conditioner. In this case, the fan speed should be periodically switched between medium and low (following a sine wave, cosine wave, or square wave pattern). The air guide should be used for both vertical and horizontal airflow to reduce water vapor release. Defrosting should end after t3 hours. If not, check the indoor relative humidity H. 环 If the humidity is less than H2, it indicates that the indoor relative humidity is low. To increase the removal of water vapor, the indoor fan should be set to a silent mode, and the upper and lower air guides should be set to the minimum airflow position. For example, [the following text is incomplete and requires further context]. Figure 2 At position L1 as shown, with the left and right air guide vanes remaining in their positions, defrosting will end after time t3. If the humidity is between H1 and H2 (H2≤H2), 环 If ≤H1), then the positions of the windshield and the air guide plate remain unchanged, and defrosting ends after running for t3 time.

[0059] In the third stage of defrosting, after the compressor frequency is increased to the third preset frequency value for a preset time, the opening of the air conditioner's throttling device is controlled according to the outdoor heat exchanger pipe temperature. That is, the indoor fan is controlled to run at the third set speed, the compressor frequency is controlled to increase to the third preset frequency value N3, and the opening of the throttling device is controlled to run at the third preset opening P3. After a preset time T', the opening of the air conditioner's throttling device is controlled according to the outdoor heat exchanger pipe temperature.

[0060] In one specific embodiment, after the compressor frequency is increased to a third preset frequency value for a preset time T' (T' is the time from when the compressor frequency increases to the third preset frequency value N3 to when the outdoor heat exchanger tube temperature is detected), the outdoor heat exchanger tube temperature T is detected. 管 If the second preset pipe temperature T2 is greater than the sum of the third preset pipe temperature T3 and the preset pipe temperature fluctuation value ΔT2, where the second preset pipe temperature T2 is less than the third preset pipe temperature T3, then the opening of the throttling device is controlled to increase at a preset rate until the outdoor heat exchanger pipe temperature T... 管 The temperature is equal to the sum of the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2. Defrosting ends when the time from compressor frequency increase to frequency constant reaches time t3. If the outdoor heat exchanger pipe temperature T is detected... 管 If the outdoor heat exchanger tube temperature T is less than the sum of the third preset tube temperature value T3 and the preset tube temperature fluctuation value ΔT2, then the outdoor heat exchanger tube temperature T is detected. 管 If the temperature difference is less than the difference between the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2, then the opening of the throttling device is controlled to decrease at a preset rate until the outdoor heat exchanger pipe temperature T... 管 The temperature difference between the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2 is equal to the difference between the preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2. Defrosting ends after time t3 is reached when the compressor frequency increases to a constant frequency. If the outdoor heat exchanger pipe temperature T is detected... 管Greater than or equal to the difference between the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2 (T3-ΔT2≤T 管 If <T3+ΔT2), then defrosting ends after the time from compressor frequency increase to constant frequency reaches time t3.

[0061] Specifically, when the compressor frequency is increased to N3, the electronic expansion valve operates at P3 opening, and the outdoor heat exchanger tube temperature T is measured after time T'. 管 If the temperature fluctuation value is greater than the preset pipe temperature T2 + pipe temperature fluctuation value ΔT2, then the electronic expansion valve P increases at a rate of ΔP per m / s until T... 管 =T3+ΔT2, During this process, the outdoor heat exchanger tube temperature T is checked every m seconds. 管 Defrosting should end after the compressor reaches a constant frequency (t3) after a period of time; otherwise, the outdoor heat exchanger tube temperature (T) should be checked. 管 If the temperature fluctuation value is less than the preset pipe temperature value T3 - pipe temperature fluctuation value ΔT2, then the electronic expansion valve P decreases at a rate of ΔP per m / s until T... 管 =T3-ΔT2, during this process, T is checked every m seconds. 管 Defrosting ends after the compressor reaches a constant frequency (t3) over a period of time. If neither of these two cases applies, i.e., T3 - ΔT2 ≤ T... 管 If <T3+ΔT2, then defrosting ends after the compressor goes from increasing frequency to constant frequency t3.

[0062] Figure 3 The diagram illustrates the preset values ​​and time variations of the outdoor heat exchanger tube temperature during the three defrosting stages of this invention. Figure 3 As shown, the horizontal axis represents time (in seconds), and the vertical axis represents the preset value of the outdoor heat exchanger pipe temperature (in degrees Celsius). The preset compressor frequencies for the first, second, and third defrosting stages are N1, N2, and N3, respectively, where N1 < N2 < N3. The preset pipe temperatures for the first, second, and third stages are T1, T2, and T3, respectively, where T1 < T2 < T3. t1, t2, and t3 are the preset operating times for the compressor to transition from frequency ramp-up to constant frequency.

[0063] To clearly illustrate the technical solution of the present invention, the execution flow of the self-cleaning control method for air conditioners provided by the present invention will be described below with reference to a specific embodiment.

[0064] Figure 4 This is a schematic diagram of a specific embodiment of the self-cleaning control method for air conditioners provided by the present invention. Figure 4 As shown, after entering the self-cleaning defrosting stage, the internal fan speed, air guide plate, compressor and electronic expansion valve are controlled in three sub-stages.

[0065] First, in the first stage, we first measure the indoor ambient temperature T. 环Is it greater than or equal to the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1, that is, does it satisfy T? 环 If the temperature is ≥T1+ΔT1, it indicates a high indoor temperature. The heat from the air can melt the frost or ice on the evaporator surface. In this case, the indoor fan should be set to high speed to accelerate air circulation. The upper and lower air guides should be positioned to avoid blowing air into people (e.g., L2 position), and the left and right air guides should be positioned at maximum airflow (specifically, the left and right air guides should be perpendicular to the air outlet plane). After running for time t0, proceed to the second stage. If the indoor ambient temperature T... 环 The temperature is less than the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1, that is, T 环 <T1+ΔT1, then the internal fan is controlled to run at high speed, the upper and lower air guides are kept in the non-blowing position (L2 position), the compressor frequency is increased to the first preset frequency value N1, and the opening of the throttling device (e.g., the valve step of the electronic expansion valve) is operated according to the first preset opening P1. After time T', the outdoor heat exchanger tube temperature T is detected. 管 Is it greater than or equal to the sum of the preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2, that is, does it satisfy T? 管 If the value is greater than T1 + ΔT2, then the valve step P of the electronic expansion valve increases at a rate of ΔP per m seconds until T... 管 =T1+ΔT2, during this process, the outdoor heat exchanger tube temperature T is measured every m seconds. 管 The compressor enters the second stage after a time t1 between frequency ramp-up and constant frequency; simultaneously, the outdoor heat exchanger tube temperature T is monitored. 管 Whether it is less than the difference between the first preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2, that is, whether it meets the requirement of T 管 <T1-ΔT2, if so, then the valve step P of the electronic expansion valve decreases at a rate of ΔP per m seconds until T 管 =T1-ΔT2, during this process, T is checked every m seconds. 管 The compressor enters the second stage after a time t1 when it transitions from frequency ramp-up to constant frequency; if neither of the above two cases applies (T1-ΔT2<T), the compressor will enter the second stage. 管 If <T1+ΔT2), then the compressor enters the second stage after a time t1 when it goes from increasing frequency to constant frequency.

[0066] After entering this stage, the indoor fan speed is adjusted to medium speed (this helps to increase the evaporator pipe temperature and avoids high-frequency compressor operation, thus achieving energy saving). At the same time, the compressor frequency is increased to N2, and the electronic expansion valve operates at P2. After running for T' time, the indoor relative humidity H is measured. 环 Is it greater than the first preset humidity value, that is, does it meet the H... 环> H1. If so, it indicates that the relative humidity of the indoor environment is relatively high. Try to minimize the discharge of air-conditioning water vapor. At this time, the air volume setting operates in a high and medium air volume cycle (according to sine wave, cosine wave, square wave, etc.), and the air deflector performs up-and-down and left-and-right sweeping to reduce the release of water vapor with a larger air volume. If not satisfied with H 环 > H1, then detect the relative humidity H of the indoor environment 环 to see if it is less than the second preset humidity value, that is, whether it satisfies H 环 < H2. If so, it indicates that the relative humidity of the indoor environment is relatively low. Increase the discharge of water vapor. At this time, the indoor fan operates at a low air volume, and the up-and-down air deflector is at the position with the minimum air volume for discharge (such as position L1), and the position of the left-and-right air deflector remains unchanged. If the relative humidity of the indoor environment is between H1 and H2 (H2 ≤ H 环 ≤ H1), then both the air volume setting and the position of the air deflector remain unchanged, and after running for t2 time, it enters the third stage.

[0067] Meanwhile, in the second stage, the temperature T of the pipe needs to be detected 管 . The rotational speed of the indoor fan is adjusted to the medium air volume, the frequency of the compressor is increased to N2, the valve step of the electronic expansion valve operates according to P2. After T` time, detect the temperature T of the outdoor heat exchanger pipe 管 to see if it is greater than the sum of the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2, that is, whether it satisfies T 管 > T2 + ΔT2. If so, the valve step P of the electronic expansion valve increases at a speed of ΔP per m seconds (i.e., ΔP / ms) until T 管 = T2 + ΔT2. During this process, check T every m seconds 管 . After the compressor changes from frequency increase to constant frequency for t2 time, it enters the third stage; if not satisfied with T 管 > T2 + ΔT2, then detect the temperature T of the outdoor heat exchanger pipe 管 to see if it is less than the difference between the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2, that is, whether it satisfies T 管 < T2 - ΔT2. If so, the valve step P of the electronic expansion valve decreases at a speed of ΔP per m seconds until T 管 = T2 - ΔT2. During this process, check T every m seconds 管 . After the compressor changes from frequency increase to constant frequency for t2 time, it enters the third stage; if it does not fall into the above two situations (T2 - ΔT2 ≤ T 管 < T2 + ΔT2), then after the compressor changes from frequency increase to constant frequency for t2 time, it enters the third stage.

[0068] After entering the third stage, the rotational speed of the indoor fan is adjusted to the low air volume (which is beneficial to increasing the temperature of the evaporator pipe, avoiding high-frequency operation of the compressor, and achieving energy-saving effects). At the same time, the compressor frequency is increased to N3, and the valve step of the electronic expansion valve operates according to P3. Detect the relative humidity H of the indoor environment环 Is it greater than the first preset humidity value H1, that is, whether it satisfies H 环 > H1. If so, it means that the relative humidity of the indoor environment is relatively high, and the discharge of air-conditioning water vapor should be reduced as much as possible. At this time, the air volume is operated periodically (according to sine wave, cosine wave or square wave, etc.) in the medium air volume and low air volume gears, and the air deflector uses up and down sweeping and left and right sweeping to reduce the release of water vapor with a larger air volume. After running for t3 time, the defrosting ends. If it does not satisfy H 环 > H1, then the relative humidity H of the indoor environment is detected 环 Is it less than the second preset humidity value H2, that is, whether it satisfies H 环 < H2. If so, it means that the relative humidity of the indoor environment is relatively low, and the discharge of water vapor is increased. At this time, the indoor fan uses the silent air volume gear, and the up and down air deflectors are at the position with the minimum air volume (such as position L1), and the position of the left and right air deflectors remains unchanged. After running for t3 time, the defrosting ends. If the relative humidity of the indoor environment is between H1 and H2 (H2 ≤ H 环 ≤ H1), then the air volume and the position of the air deflector remain unchanged, and the defrosting ends after running for t3 time.

[0069] Meanwhile, in the third stage, the temperature T of the pipe needs to be detected 管 . When the rotational speed of the indoor fan is adjusted to the low air volume gear, the compressor raises the frequency to N3, and the valve step of the electronic expansion valve runs according to P3. After T` time, T is detected 管 Is it greater than the sum of the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2, that is, whether it satisfies T 管 > T3 + ΔT2. If so, the electronic expansion valve P rises at a speed of ΔP per m seconds until T 管 = T3 + ΔT2. During this process, T is checked every m seconds 管 . After the compressor changes from frequency increase to constant frequency for t3 time, the defrosting ends; meanwhile, T is detected 管 Is it less than the difference between the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2, that is, whether it satisfies T 管 < T3 - ΔT2. If so, the electronic expansion valve P decreases at a speed of ΔP per m seconds (that is, ΔP / ms) until T 管 = T3 - ΔT2. During this process, T is checked every m seconds 管 . After the compressor changes from frequency increase to constant frequency for t3 time, the defrosting ends; if it does not belong to the above two situations (T3 - ΔT2 < T 管 < T3 + ΔT2), then the defrosting ends after the compressor changes from frequency increase to constant frequency for t3 time.

[0070] Figure 5 It is a schematic diagram of the method of a preferred embodiment of the self-cleaning control method of the air conditioner provided by the present invention. As Figure 5As shown, the parameter values ​​are set as follows: T1=25℃, T2=40℃, T3=50℃, ΔT1=3℃, ΔT2=1℃, N1=15Hz, N2=25Hz, N3=35Hz, P1=120P, P2=160P, P3=200P, H1=60%, H2=40%, t0=240s, t1=180s, t2=240s, t3=240s, T`=120s, ΔP / ms=10P / 30s. The specific steps are as described above. Figure 4 The description is omitted here.

[0071] The present invention also provides a self-cleaning control device for an air conditioner. The defrosting stage of the self-cleaning of the air conditioner includes, in sequence, a first defrosting stage, a second defrosting stage, and a third defrosting stage.

[0072] Figure 6 This is a structural block diagram of an embodiment of the self-cleaning control device for air conditioners provided by the present invention. Figure 6 As shown, the self-cleaning control device 100 of the air conditioner includes: a first control unit 110, a second control unit 120 and a third control unit 130.

[0073] The first control unit 110 is used to, in the first stage of defrosting, if the detected indoor ambient temperature is less than the sum of the first preset pipe temperature value and the preset pipe temperature margin value, control the indoor fan to run at the first set speed, control the upper and lower air guide plates to stay at the first preset position, control the left and right air guide plates to stay at the position with the maximum air volume, control the compressor frequency to increase to the first preset frequency value, and control the opening degree of the throttling device to run at the first preset opening degree.

[0074] Specifically, after entering the defrosting stage, the first defrosting stage is first carried out. During the first defrosting stage, the current indoor ambient temperature T is detected. 环 Is it greater than or equal to the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1? Wherein, if the current indoor ambient temperature T is detected... 环 If the temperature is greater than or equal to the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1, then the indoor fan is controlled to run at the first set speed (e.g., high speed), the upper and lower air guides are controlled to stay at the first preset position (e.g., the non-blowing position), and the left and right air guides are controlled to stay at the position with the maximum airflow. After running for time t0, the second defrosting stage begins. If the indoor ambient temperature T is detected... 环 If the temperature is less than the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1, then the internal fan is controlled to run at the first set speed (e.g., high speed), the upper and lower air guides are controlled to stay at the first preset position (not blowing air into people), the left and right air guides are controlled to stay at the position with the maximum air volume, the compressor frequency is controlled to increase to the first preset frequency value N1, and the opening of the throttling device is controlled to run at the first preset opening P1.

[0075] More specifically, if the current indoor ambient temperature T is detected... 环 If the temperature is greater than or equal to the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1, it indicates that the indoor ambient temperature is high. The heat of the air can be used to melt the frost or ice layer on the evaporator surface. In this case, the indoor fan can be set to a high speed to accelerate air circulation, and the upper and lower air guides should be positioned so as not to blow air into people. For example... Figure 2 A schematic diagram showing the stopping positions of the upper and lower air guide vanes of an air conditioner is provided. Figure 2 As shown, five preset stopping positions are defined by angles L1, L2, L3, L4, and L5, where L1 < L2 < L3 < L4 < L5. The upper and lower air guides can stop at position L2, which is the position where the airflow does not blow directly on people. The left and right air guides stop at the position with the maximum airflow, specifically, the positions where the left and right air guides are perpendicular to the plane of the air outlet.

[0076] If the current indoor ambient temperature T is detected 环 If the temperature is less than the sum of the first preset pipe temperature value T1 and the preset pipe temperature margin value ΔT1, then the internal fan is controlled to run at the first set speed (high speed), the upper and lower air guides are controlled to stay at the first preset position (non-blowing position), the left and right air guides are controlled to stay at the position with the maximum air volume, the compressor frequency is controlled to increase to the first preset frequency value N1, and the opening of the throttling device (e.g., the valve step of the electronic expansion valve) is controlled to run at the first preset opening P1.

[0077] Furthermore, the first control unit 110 is also used to: control the compressor frequency to rise to the first preset frequency value N1 for a preset time, and then control the opening degree of the throttling device of the air conditioner according to the outdoor heat exchanger pipe temperature.

[0078] In one specific implementation, during the first stage of defrosting, the opening degree of the air conditioner's throttling device is controlled based on the outdoor heat exchanger pipe temperature. Specifically, this may include: detecting the outdoor heat exchanger pipe temperature T. 管 Is the temperature greater than the sum of the first preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2? If so, control the opening of the throttling device to increase at a preset rate until the outdoor heat exchanger pipe temperature T... 管 The temperature is equal to the sum of the first preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2. When the time from compressor frequency increase to frequency stability reaches time t1 (i.e., t≥t1), the second defrosting stage begins. If the outdoor heat exchanger pipe temperature T is detected... 管 If the outdoor heat exchanger tube temperature T is less than the sum of the first preset tube temperature value T1 and the preset tube temperature fluctuation value ΔT2, then the outdoor heat exchanger tube temperature T is detected. 管 If the temperature is less than the difference between the first preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2, then the opening of the throttling device is controlled to decrease at a preset rate until the outdoor heat exchanger pipe temperature T... 管The difference between the first preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2 is equal to the time t1 after the compressor frequency increases to a constant frequency (i.e., t≥t1). The second defrosting stage begins when the time from frequency increase to constant frequency reaches t1. If the outdoor heat exchanger pipe temperature T is detected... 管 If the difference between the first preset pipe temperature value T1 and the preset pipe temperature fluctuation value ΔT2 is greater than or equal to the first preset pipe temperature value T1, then after the time from compressor frequency increase to frequency constant reaches time t1, the second defrosting stage begins.

[0079] For example, the indoor fan is running at high speed, the upper and lower air guides are at position L2, the compressor increases its frequency to N1, the electronic expansion valve opens at P1, and the outdoor heat exchanger tube temperature T is measured after time T'. 管 If the temperature fluctuation value is greater than the preset pipe temperature value T1 + pipe temperature fluctuation value ΔT2, then the opening degree P of the electronic expansion valve increases at a rate of ΔP per millisecond until T... 管 =T1+ΔT2, during this process, the outdoor heat exchanger tube temperature T is checked every m seconds. 管 After the compressor reaches a constant frequency (t1 time), it enters the second stage; otherwise, the outdoor heat exchanger tube temperature (T) is detected. 管 If the temperature difference is less than the preset pipe temperature value T1 - pipe temperature fluctuation value ΔT2, then the electronic expansion valve P decreases at a rate of ΔP per m / s until T... 管 =T1-ΔT2, during this process, the outdoor heat exchanger tube temperature T is checked every m seconds. 管 If the compressor enters the second stage after a time t1 from frequency increase to constant frequency, then if neither of the above two situations applies, the compressor enters the second stage after a time t1 from frequency increase to constant frequency.

[0080] The second control unit 120 is used to control the internal fan to run at a second set speed, control the compressor frequency to increase to a second preset frequency value, and control the opening degree of the throttling device to run at a second preset opening degree during the second defrosting stage.

[0081] As the frost and ice layers on the evaporator melt, a large amount of water vapor is gradually generated, which has both positive and negative impacts on the environment. If the indoor relative humidity is low, this water vapor can be used to humidify the environment and improve indoor comfort. If the indoor relative humidity is high, the release of water vapor should be minimized as much as possible to maintain the indoor relative humidity within a comfortable range.

[0082] After entering the second stage of defrosting, the indoor fan speed is adjusted to the second preset speed (e.g., medium speed), which is beneficial for raising the evaporator pipe temperature and avoids high-frequency compressor operation, thus achieving energy saving. The lower the indoor fan speed, the less easily the evaporator temperature dissipates in heating mode, making it easier for the evaporator temperature to rise (which is beneficial for defrosting). At the same time, the compressor frequency increases to the second preset frequency value N2, where the first preset frequency value N1 is less than the second preset frequency value N2. The opening of the throttling device (e.g., the valve step of the electronic expansion valve) is controlled to operate at the second preset opening P2, where the first preset opening P1 is less than the second preset opening P2.

[0083] The second control unit 120 is further configured to: after controlling the compressor frequency to increase to a second preset frequency value for a preset time, control the indoor fan speed and / or the air guide plate position of the air conditioner according to the current indoor relative humidity. That is, after controlling the indoor fan to run at a second set speed (medium speed), controlling the compressor frequency to increase to a second preset frequency value N2, controlling the opening of the throttling device to run at a second preset opening P2, and after a preset time T', control the indoor fan speed and / or the air guide plate position of the air conditioner according to the current indoor relative humidity.

[0084] In one specific implementation, the current indoor relative humidity H is detected. 环 If the relative humidity is greater than the first preset humidity value, then control the internal fan to periodically switch between the first and second preset speeds, control the upper and lower air guides to perform vertical air sweeping, and the left and right air guides to perform horizontal air sweeping. After running for time t2, enter the third stage of defrosting; if the current indoor relative humidity H is detected... 环 If the relative humidity is less than or equal to the first preset humidity value H1, then the current indoor relative humidity H is detected. 环 Is the relative humidity less than the second preset humidity value H2, and the first preset humidity value H1 is greater than the second preset humidity value H2? If yes, then control the internal fan to run at the third preset speed (e.g., low speed), control the upper and lower air guides to stay at the minimum airflow position (e.g., L1 position), and keep the left and right air guides in the same position. After running for t2 hours, enter the third stage of defrosting; if the current indoor relative humidity H is detected... 环 Greater than or equal to the second preset humidity value (H2≤H) 环 If ≤H1), the internal fan speed and the position of the air guide plate remain unchanged. After running for t2 hours, the third stage of defrosting begins.

[0085] Specifically, after entering the second stage of defrosting, the indoor fan speed is adjusted to medium speed, the compressor frequency is increased to N2, the electronic expansion valve opening is set to P2, and the indoor relative humidity H is monitored. 环If the relative humidity is greater than the first preset humidity value H1, it indicates that the indoor relative humidity is high, and the air conditioner's water vapor emission should be reduced as much as possible. In this case, the fan speed should be periodically switched between high and medium speeds (e.g., according to a sine wave, cosine wave, or square wave pattern), and the air guide should be used for both vertical and horizontal airflow to reduce water vapor release. After running for time t2, the third stage of defrosting begins. If not, the indoor relative humidity H1 should be checked. 环 If the humidity is less than H2, it indicates that the indoor relative humidity is low. To increase the removal of water vapor, the indoor fan should be set to a low speed, and the upper and lower air guides should be set to the position with the minimum airflow (e.g., [missing information]). Figure 2 (At position L1), the positions of the left and right air guides remain unchanged. After running for time t2, the third stage of defrosting begins. If the humidity is between H1 and H2 (H2≤H2), the defrosting process continues. 环 If ≤H1), then the positions of the windshield and the air guide plate remain unchanged, and after running for t2 time, it enters the third stage of defrosting.

[0086] Meanwhile, the second control unit 120 is also used to: in the second defrosting stage, after controlling the compressor frequency to rise to the second preset frequency value for a preset time, control the opening degree of the air conditioner's throttling device according to the outdoor heat exchanger pipe temperature, that is, control the indoor fan to run at the second set speed (e.g., medium speed), control the compressor frequency to rise to the second preset frequency value N2, control the opening degree of the throttling device to run at the second preset opening degree P2, and after a preset time T', control the opening degree of the air conditioner's throttling device according to the current outdoor heat exchanger pipe temperature.

[0087] In one specific embodiment, after the compressor frequency is increased to a second preset frequency value for a preset time T' (T' is the time from when the compressor frequency increases to the second preset frequency value N2 until the outdoor heat exchanger tube temperature is detected), the outdoor heat exchanger tube temperature T is detected. 管 Is the first preset pipe temperature T1 greater than or equal to the sum of the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2, where the first preset pipe temperature value T1 is less than the second preset pipe temperature value T2? If so, the opening of the throttling device is controlled to increase at a preset rate until the outdoor heat exchanger pipe temperature T1 increases. 管 The temperature is equal to the sum of the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2. When the time from compressor frequency increase to frequency stability reaches time t2, the third stage of defrosting begins. If the outdoor heat exchanger pipe temperature T is detected... 管 If the outdoor heat exchanger tube temperature T is less than the sum of the second preset tube temperature value T2 and the preset tube temperature fluctuation value ΔT2, then the outdoor heat exchanger tube temperature T is detected. 管 If the temperature is less than the difference between the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2, then the opening of the throttling device is controlled to decrease at a preset rate until the outdoor heat exchanger pipe temperature T 管The difference between the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2 is equal to the difference between the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2. After time t2 is reached from the compressor frequency increase to a constant frequency, the third stage of defrosting begins. If the outdoor heat exchanger pipe temperature T is detected... 管 Greater than or equal to the difference between the second preset pipe temperature value T2 and the preset pipe temperature fluctuation value ΔT2 (T2-ΔT2≤T 管 If <T2+ΔT2), then after the time from compressor frequency increase to constant frequency reaches time t2, the third stage of defrosting begins.

[0088] Specifically, when the compressor frequency is increased to N2, the electronic expansion valve operates at P2 opening, and the outdoor heat exchanger tube temperature T is measured after time T'. 管 If the temperature fluctuation value is greater than the preset pipe temperature T2 + pipe temperature fluctuation value ΔT2, then the electronic expansion valve P increases at a rate of ΔP per m / s until T... 管 =T2+ΔT2, during this process, the outdoor heat exchanger tube temperature T is checked every m seconds. 管 The compressor enters the third stage after a time t2 between frequency ramp-up and constant frequency; otherwise, the outdoor heat exchanger tube temperature T is detected. 管 If the temperature difference is less than the preset pipe temperature value T2 - pipe temperature fluctuation value ΔT2, then the electronic expansion valve P decreases at a rate of ΔP per m / s until T... 管 =T2-ΔT2, during this process, the outdoor heat exchanger tube temperature T is checked every m seconds. 管 The compressor enters the third stage after a time t2 between increasing and maintaining a constant frequency; if neither of the above two cases applies, i.e., T2 - ΔT2 ≤ T 管 If <T2+ΔT2, then the compressor enters the third stage after a time t2 when it goes from increasing frequency to constant frequency.

[0089] The third control unit 130 is used to control the internal fan to run at a third set speed, control the compressor frequency to increase to a third preset frequency value, and control the opening degree of the throttling device to run at a third preset opening degree during the third defrosting stage.

[0090] Specifically, after entering the third stage of defrosting, the internal fan speed is adjusted to the third set speed (e.g., low fan speed), which is conducive to the increase of evaporator pipe temperature, avoids high-frequency operation of the compressor, and achieves energy saving effect. At the same time, the compressor frequency is increased to the third preset frequency value N3, the second preset frequency value N2 is less than the third preset frequency value N3, and the electronic expansion valve operates according to the third preset opening P3, the second preset opening P2 is less than the third preset opening P3.

[0091] The third control unit 130 is further configured to: after controlling the compressor frequency to rise to the third preset frequency value for a preset time, control the speed of the indoor fan and / or the position of the air guide plate of the air conditioner according to the current indoor relative humidity, that is, control the indoor fan to run at the third set speed, control the compressor frequency to rise to the third preset frequency value N3, control the opening degree of the throttling device to run at the third preset opening degree P3, and after a preset time T', control the speed of the indoor fan and / or the position of the air guide plate of the air conditioner according to the current indoor relative humidity.

[0092] In one specific implementation, after entering the third stage of defrosting operation for a preset time T' (T' is the time from when the compressor frequency increases to N3 until the pipe temperature is detected), the current indoor relative humidity H is detected. 环 If the relative humidity is greater than the first preset humidity value, then control the internal fan to periodically switch between the second and third preset speeds, control the upper and lower air guides to perform vertical air sweeping, and the left and right air guides to perform horizontal air sweeping. After running for t3 time, defrosting ends; if the current indoor relative humidity H is detected... 环 If the relative humidity is less than or equal to the first preset humidity value, then the current indoor relative humidity H is detected. 环 If the humidity is less than the second preset value, then control the internal fan to run at the fourth preset speed (silent mode), control the upper and lower air guides to stay at the minimum airflow position (e.g., L1 position), and keep the left and right air guides in the same position. After running for t3 time, defrosting ends; if the current indoor relative humidity H is detected... 环 Greater than or equal to the second preset humidity value (H2≤H) 环 If ≤H1), the internal fan speed and the position of the air guide plate remain unchanged, and defrosting ends after running for t3 time.

[0093] Specifically, after entering the third stage of defrosting, the indoor fan speed is adjusted to the third set speed (e.g., low fan speed), the compressor frequency is increased to N3, the electronic expansion valve opening is set to P3, and the indoor relative humidity H is detected. 环 If the relative humidity is greater than H1, it indicates that the indoor relative humidity is high. Minimize the release of water vapor from the air conditioner. In this case, the fan speed should be periodically switched between medium and low (following a sine wave, cosine wave, or square wave pattern). The air guide should be used for both vertical and horizontal airflow to reduce water vapor release. Defrosting should end after t3 hours. If not, check the indoor relative humidity H. 环 If the humidity is less than H2, it indicates that the indoor relative humidity is low. To increase the removal of water vapor, the indoor fan should be set to a silent mode, and the upper and lower air guides should be set to the minimum airflow position. For example, [the following text is incomplete and requires further context]. Figure 2 At position L1 as shown, the positions of the left and right air guides remain unchanged, and defrosting ends after running for time t3; if the humidity is between H1 and H2 (H2≤H环 If ≤H1), then the positions of the windshield and the air guide plate remain unchanged, and defrosting ends after running for t3 time.

[0094] The third control unit 130 is further configured to: in the third defrosting stage, after controlling the compressor frequency to rise to the third preset frequency value for a preset time, control the opening degree of the air conditioner's throttling device according to the outdoor heat exchanger pipe temperature, that is, control the indoor fan to run at the third set speed, control the compressor frequency to rise to the third preset frequency value N3, and control the opening degree of the throttling device to run at the third preset opening degree P3. Further, the third control unit 130 is also configured to: after a preset time T', control the opening degree of the air conditioner's throttling device according to the outdoor heat exchanger pipe temperature.

[0095] In one specific embodiment, after the compressor frequency is increased to a third preset frequency value for a preset time T' (T' is the time from when the compressor frequency increases to the third preset frequency value N3 to when the outdoor heat exchanger tube temperature is detected), the outdoor heat exchanger tube temperature T is detected. 管 Is the second preset pipe temperature value T2 greater than or equal to the sum of the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2, where the second preset pipe temperature value T2 is less than the third preset pipe temperature value T3? If so, the opening of the throttling device is controlled to increase at a preset rate until the outdoor heat exchanger pipe temperature T... 管 The temperature is equal to the sum of the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2. Defrosting ends when the time from compressor frequency increase to frequency constant reaches time t3. If the outdoor heat exchanger pipe temperature T is detected... 管 If the outdoor heat exchanger tube temperature T is less than the sum of the third preset tube temperature value T3 and the preset tube temperature fluctuation value ΔT2, then the outdoor heat exchanger tube temperature T is detected. 管 If the temperature difference is less than the difference between the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2, then the opening of the throttling device is controlled to decrease at a preset rate until the outdoor heat exchanger pipe temperature T... 管 The temperature difference between the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2 is equal to the difference between the preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2. Defrosting ends after time t3 is reached when the compressor frequency increases to a constant frequency. If the outdoor heat exchanger pipe temperature T is detected... 管 Greater than or equal to the difference between the third preset pipe temperature value T3 and the preset pipe temperature fluctuation value ΔT2 (T3-ΔT2≤T 管 If <T3+ΔT2), then defrosting ends after the time from compressor frequency increase to constant frequency reaches time t3.

[0096] Specifically, when the compressor frequency is increased to N3, the electronic expansion valve operates at P3 opening, and the outdoor heat exchanger tube temperature T is measured after time T'. 管 If the temperature fluctuation value is greater than the preset pipe temperature T2 + pipe temperature fluctuation value ΔT2, then the electronic expansion valve P increases at a rate of ΔP per m / s until T... 管=T3+ΔT2, During this process, the outdoor heat exchanger tube temperature T is checked every m seconds. 管 Defrosting should end after the compressor reaches a constant frequency (t3) after a period of time; otherwise, the outdoor heat exchanger tube temperature (T) should be checked. 管 If the temperature fluctuation value is less than the preset pipe temperature value T3 - pipe temperature fluctuation value ΔT2, then the electronic expansion valve P decreases at a rate of ΔP per m / s until T... 管 =T3-ΔT2, during this process, T is checked every m seconds. 管 Defrosting ends after the compressor reaches a constant frequency (t3) over a period of time. If neither of these two cases applies, i.e., T3 - ΔT2 ≤ T... 管 If <T3+ΔT2, then defrosting ends after the compressor goes from increasing frequency to constant frequency t3.

[0097] The present invention also provides a storage medium corresponding to the self-cleaning control method of the air conditioner, wherein a computer program is stored thereon, and when the program is executed by a processor, it implements the steps of any of the aforementioned methods.

[0098] The present invention also provides an air conditioner corresponding to the self-cleaning control method of the air conditioner, comprising a processor, a memory, and a computer program stored in the memory that can run on the processor, wherein the processor executes the program to implement the steps of any of the aforementioned methods.

[0099] The present invention also provides an air conditioner corresponding to the self-cleaning control device of the air conditioner, including the self-cleaning control device of any of the aforementioned air conditioners.

[0100] The present invention also provides a computer program product corresponding to the self-cleaning control method of the air conditioner, comprising a computer program that, when executed by a processor, implements the steps of any of the aforementioned methods.

[0101] Accordingly, the solution provided by the present invention solves the problem of water overflow during the defrosting stage by controlling the speed of the internal fan, the air guide plate, the compressor and the electronic expansion valve, and at the same time uses the water vapor generated by evaporation to improve the relative humidity of the indoor environment.

[0102] According to the technical solution of the present invention, by controlling the air guide plate, the speed of the internal fan, the compressor, and the electronic expansion valve, the temperature of the surface of the indoor evaporator gradually increases, the frost and ice layer gradually melts, and the melted water gradually flows out from the drain hole, thus avoiding the situation where a large amount of melted water is generated due to a sudden increase in the temperature of the evaporator, which would overflow and drip out of the shell.

[0103] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this invention and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units can be integrated into a single processing unit, or each unit can exist physically separately, or two or more units can be integrated into a single unit.

[0104] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0105] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0106] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0107] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A self-cleaning control method for an air conditioner, characterized in that, The defrosting phase of the air conditioner's self-cleaning process sequentially includes: a first defrosting phase, a second defrosting phase, and a third defrosting phase; the self-cleaning control method includes: In the first stage of defrosting, if the detected indoor ambient temperature is less than the sum of the first preset pipe temperature value and the preset pipe temperature margin value, the indoor fan is controlled to run at the first set speed, the upper and lower air guide plates are controlled to stay at the first preset position, the left and right air guide plates are controlled to stay at the position with the maximum air volume, the compressor frequency is controlled to increase to the first preset frequency value, and the opening of the throttling device is controlled to run at the first preset opening. In the second stage of defrosting, the internal fan is controlled to run at the second set speed, the compressor frequency is controlled to rise to the second preset frequency value, and the opening of the throttling device is controlled to run at the second preset opening. In the third stage of defrosting, the internal fan is controlled to run at the third set speed, the compressor frequency is controlled to rise to the third preset frequency value, and the opening of the throttling device is controlled to run at the third preset opening. The first preset rotational speed is greater than the second preset rotational speed, and the second preset rotational speed is greater than the third preset rotational speed; the first preset frequency value is less than the second preset frequency value, and the second preset frequency value is less than the third preset frequency value; the first preset opening degree is less than the second preset opening degree, and the second preset opening degree is less than the third preset opening degree.

2. The method according to claim 1, characterized in that, Also includes: In the first stage of defrosting, if the detected indoor ambient temperature is greater than or equal to the sum of the first preset pipe temperature value and the preset pipe temperature margin value, the indoor fan is controlled to run at the first set speed, the upper and lower air guide plates are controlled to stay at the first preset position, and the left and right air guide plates are controlled to stay at the position with the maximum air volume.

3. The method according to claim 1 or 2, characterized in that, Also includes: In the first stage of defrosting, after the compressor frequency is increased to the first preset frequency value for a preset time, the opening degree of the air conditioner's throttling device is controlled according to the outdoor heat exchanger pipe temperature. And / or, In the second stage of defrosting, after the compressor frequency is increased to the second preset frequency value for a preset time, the speed of the indoor fan and / or the position of the air guide plate of the air conditioner are controlled according to the relative humidity of the indoor environment, and / or the opening degree of the throttling device of the air conditioner is controlled according to the outdoor heat exchanger pipe temperature. And / or, In the third stage of defrosting, after the compressor frequency is increased to the third preset frequency value for a preset time, the speed of the indoor fan and / or the position of the air guide plate of the air conditioner are controlled according to the relative humidity of the indoor environment, and / or the opening degree of the throttling device of the air conditioner is controlled according to the outdoor heat exchanger pipe temperature.

4. The method according to claim 3, characterized in that, In the first stage of defrosting, the opening degree of the throttling device of the air conditioner is controlled according to the outdoor heat exchanger pipe temperature, including: Detect whether the outdoor heat exchanger tube temperature is greater than the sum of the first preset tube temperature value and the preset tube temperature fluctuation value; if so, control the opening of the throttling device to increase at a preset speed until the outdoor heat exchanger tube temperature is equal to the sum of the first preset tube temperature value and the preset tube temperature fluctuation value. If the detected outdoor heat exchanger tube temperature is less than the sum of the first preset tube temperature value and the preset tube temperature fluctuation value, then it is detected whether the outdoor heat exchanger tube temperature is less than the difference between the first preset tube temperature value and the preset tube temperature fluctuation value. If so, the opening of the throttling device is controlled to decrease at a preset speed until the outdoor heat exchanger tube temperature is equal to the difference between the first preset tube temperature value and the preset tube temperature fluctuation value. If the detected outdoor heat exchanger tube temperature is greater than or equal to the difference between the first preset tube temperature value and the preset tube temperature fluctuation value, then after the time from compressor frequency increase to frequency constant reaches time t1, the second defrosting stage begins.

5. The method according to claim 3, characterized in that, In the second stage of defrosting, the indoor fan speed and / or air guide vane position of the air conditioner are controlled according to the current indoor relative humidity, including: If the relative humidity of the current indoor environment is greater than the first preset humidity value, then control the indoor fan to periodically switch between the first set speed and the second set speed, and control the upper and lower air guides to perform up and down air sweeping, and the left and right air guides to perform left and right air sweeping. If the current indoor relative humidity is less than or equal to the first preset humidity value, then check whether the current indoor relative humidity is less than the second preset humidity value. If so, control the indoor fan to run at the third preset speed, control the upper and lower air guides to stay at the position with the minimum air volume, and keep the positions of the left and right air guides unchanged. If the current indoor relative humidity is greater than or equal to the second preset humidity value, the internal fan speed and the position of the air guide plate will remain unchanged. After running for t2 time, the third stage of defrosting will begin. and / or; In the second stage of defrosting, based on the current outdoor heat exchanger pipe temperature, the opening degree of the air conditioner's throttling device is controlled, including: Detect whether the outdoor heat exchanger tube temperature is greater than the sum of the second preset tube temperature value and the preset tube temperature fluctuation value; if so, control the opening of the throttling device to increase at a preset speed until the outdoor heat exchanger tube temperature is equal to the sum of the second preset tube temperature value and the preset tube temperature fluctuation value. If the outdoor heat exchanger tube temperature is detected to be less than the sum of the second preset tube temperature value and the preset tube temperature fluctuation value, then it is detected whether the outdoor heat exchanger tube temperature is less than the difference between the second preset tube temperature value and the preset tube temperature fluctuation value. If so, the opening of the throttling device is controlled to decrease at a preset speed until the outdoor heat exchanger tube temperature is equal to the difference between the second preset tube temperature value and the preset tube temperature fluctuation value. If the detected outdoor heat exchanger tube temperature is greater than or equal to the difference between the second preset tube temperature value and the preset tube temperature fluctuation value, then after the time from compressor frequency increase to frequency constant reaches time t2, the third defrosting stage begins.

6. The method according to claim 3, characterized in that, In the third stage of defrosting, the indoor fan speed and / or air guide vane position of the air conditioner are controlled according to the relative humidity of the indoor environment, including: If the relative humidity of the current indoor environment is greater than the first preset humidity value, then control the indoor fan to periodically switch between the second and third preset speeds, and control the upper and lower air guides to perform up and down air sweeping, and the left and right air guides to perform left and right air sweeping. If the current indoor relative humidity is less than or equal to the first preset humidity value, then it is checked whether the current indoor relative humidity is less than the second preset humidity value. If so, the internal fan is controlled to run at the fourth preset speed, and the upper and lower air guides are controlled to stay at the position with the minimum air volume, while the positions of the left and right air guides remain unchanged. If the current indoor relative humidity is greater than or equal to the second preset humidity value, the internal fan speed and the position of the air guides remain unchanged. After running for t3 time, defrosting ends. and / or; In the third stage of defrosting, the opening degree of the air conditioner's throttling device is controlled according to the outdoor heat exchanger pipe temperature, including: Detect whether the outdoor heat exchanger tube temperature is greater than the sum of the third preset tube temperature value and the preset tube temperature fluctuation value; if so, control the opening of the throttling device to increase at a preset speed until the outdoor heat exchanger tube temperature is equal to the sum of the third preset tube temperature value and the preset tube temperature fluctuation value. If the outdoor heat exchanger tube temperature is detected to be less than the sum of the third preset tube temperature value T3 and the preset tube temperature fluctuation value, then it is detected whether the outdoor heat exchanger tube temperature is less than the difference between the third preset tube temperature value and the preset tube temperature fluctuation value. If so, the opening of the throttling device is controlled to decrease at a preset speed until the outdoor heat exchanger tube temperature is equal to the difference between the third preset tube temperature value and the preset tube temperature fluctuation value. If the detected outdoor heat exchanger tube temperature is greater than or equal to the difference between the third preset tube temperature value and the preset tube temperature fluctuation value, then defrosting will end after the time from compressor frequency increase to frequency constant reaches time t3.

7. A self-cleaning control device for an air conditioner, characterized in that, The defrosting phase of the air conditioner's self-cleaning process sequentially includes: a first defrosting phase, a second defrosting phase, and a third defrosting phase; the self-cleaning control device includes: The first control unit is used to control the indoor fan to run at the first set speed, control the upper and lower air guides to stay at the first preset position, control the left and right air guides to stay at the position with the maximum air volume, control the compressor frequency to increase to the first preset frequency value, and control the opening of the throttling device to run at the first preset opening degree if the detected indoor ambient temperature is less than the sum of the first preset pipe temperature value and the preset pipe temperature margin value during the first defrosting stage. The second control unit is used to control the internal fan to run at a second set speed, control the compressor frequency to increase to a second preset frequency value, and control the opening of the throttling device to run at a second preset opening during the second defrosting stage. The third control unit is used to control the internal fan to run at the third set speed, control the compressor frequency to rise to the third preset frequency value, and control the opening degree of the throttling device to run at the third preset opening degree during the third defrosting stage. The first preset rotational speed is greater than the second preset rotational speed, and the second preset rotational speed is greater than the third preset rotational speed; the first preset frequency value is less than the second preset frequency value, and the second preset frequency value is less than the third preset frequency value; the first preset opening degree is less than the second preset opening degree, and the second preset opening degree is less than the third preset opening degree.

8. A storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1-5.

9. An air conditioner, characterized in that, It includes a processor, a memory, and a computer program stored on the memory that can run on the processor, wherein the processor executes the program to implement the steps of the method of any one of claims 1-5, or includes a self-cleaning control device as described in any one of claims 6-7.

10. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1-7.

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