Control method for preventing freezing of air conditioner and air conditioner to which the control method is applied

Abstract

The application provides an air conditioner anti-freezing control method and an air conditioner applying the same. The control method comprises the following steps: obtaining the temperature of an evaporator of the air conditioner and recording the temperature as a first current temperature T1; determining whether the first current temperature T1 is less than or equal to a first preset temperature Ts1, so as to determine whether the evaporator has a freezing risk; if yes, obtaining the temperature at a target position in a room where the air conditioner is located and recording the temperature as a second current temperature T2; determining whether the second current temperature T2 is greater than a second preset temperature Ts2, so as to determine whether the temperature in the room is uniformly distributed; if yes, adjusting one of the position of a horizontal air deflector and the rotating speed of a fan of the air conditioner according to a first preset rule; if the one reaches a limit value, adjusting the other of the position of the horizontal air deflector and the rotating speed of the fan according to a second preset rule; and if the other reaches the limit value, controlling the air conditioner to start an anti-freezing protection mode. The application can reduce the risk of freezing of the evaporator by using the surrounding environment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and specifically provides an air conditioner anti-freezing control method and an air conditioner applying the same. BACKGROUND

[0002] When the existing air conditioner is running in the cooling mode, dehumidification mode and other modes capable of cooling the air inside, it is easy to cause the temperature of the evaporator surface to be too low due to low inlet air temperature, insufficient air volume, insufficient refrigerant circulation and other factors, resulting in icing, that is, the evaporator is frozen. After the evaporator is frozen, not only the cooling efficiency of the evaporator on the air is affected, but also the air conditioner may blow water and ice.

[0003] In order to overcome the above problems, the existing air conditioner usually reduces the frequency of the compressor or even stops the compressor when running in the cooling mode or dehumidification mode, so as to reduce the cooling power of the evaporator. However, in this way, the air conditioner is frequently stopped and started, the cooling temperature fluctuates greatly, and the user experience is affected. SUMMARY

[0004] One object of the present application is to solve the problem that the existing air conditioner frequently adjusts the frequency of the compressor when the evaporator is at risk of freezing, resulting in large cooling temperature fluctuations.

[0005] Another object of the present application is how to make the air conditioner use the surrounding environment to reduce the risk of freezing the evaporator.

[0006] To achieve the above object, the present application provides an air conditioner anti-freezing control method in the first aspect, comprising:

[0007] Obtaining the temperature of the evaporator of the air conditioner, and recording it as a first current temperature T1;

[0008] Determining whether the first current temperature T1 is less than or equal to a first preset temperature Ts1, to determine whether the evaporator is at risk of freezing;

[0009] If it is less than or equal to, obtaining the temperature at a target position in the room where the air conditioner is located, and recording it as a second current temperature T2;

[0010] Determining whether the second current temperature T2 is greater than a second preset temperature Ts2, to determine whether the temperature in the room is evenly distributed;

[0011] If it is greater, adjusting one of the position of the horizontal air deflector and the rotating speed of the fan of the air conditioner according to a first preset rule;

[0012] If the one reaches a limit value, adjusting the other of the position of the horizontal air deflector and the rotating speed of the fan according to a second preset rule;

[0013] If the other item reaches a limit value, the air conditioner is controlled to start a freeze protection mode.

[0014] Optionally, the location where the air conditioner is located and the target location are opposite sides of the room.

[0015] Optionally, the target location is multiple;

[0016] The step of obtaining the temperature at the target location in the room where the air conditioner is located and recording it as the second current temperature T2 comprises:

[0017] Obtaining the temperature at each target location in the room where the air conditioner is located;

[0018] Recording the average of all temperatures as the second current temperature T2, or recording the maximum one of all temperatures as the second current temperature T2.

[0019] Optionally, the step of adjusting one of the position of the horizontal air deflector and the rotating speed of the fan of the air conditioner according to a first preset rule comprises:

[0020] Gradually increasing the blowing position of the horizontal air deflector of the air conditioner;

[0021] After each adjustment for a first preset time t1, the first current temperature T1 is obtained again;

[0022] If the first current temperature T1 is greater than the first preset temperature Ts1, the horizontal air deflector is controlled to keep the current position;

[0023] If the first current temperature T1 is less than or equal to the first preset temperature Ts1, the blowing position of the horizontal air deflector of the air conditioner is continued to be increased until the horizontal air deflector is increased to a limit value.

[0024] Optionally, the step of adjusting the other one of the position of the horizontal air deflector and the rotating speed of the fan according to a second preset rule if the one reaches a limit value comprises:

[0025] If the horizontal air deflector is increased to a limit value and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the rotating speed of the fan of the air conditioner is gradually increased;

[0026] After each adjustment for a second preset time t2, the first current temperature T1 is obtained again;

[0027] If the first current temperature T1 is greater than the first preset temperature Ts1, the fan is controlled to keep the current rotating speed;

[0028] If the first current temperature T1 is less than or equal to the first preset temperature Ts1, the rotation speed of the fan is continuously increased until the rotation speed of the fan reaches a limit value.

[0029] Optionally, the step of controlling the air conditioner to start the anti-freezing protection mode comprises:

[0030] gradually increasing the opening degree of the expansion valve of the air conditioner;

[0031] After each adjustment for the third preset time t3, the first current temperature T1 is obtained.

[0032] If the first current temperature T1 is greater than the first preset temperature Ts1, the expansion valve is controlled to maintain the current opening degree.

[0033] If the opening degree of the expansion valve reaches a limit value and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the compressor of the air conditioner is controlled to reduce the frequency until the compressor stops.

[0034] Optionally, the number of times that the air conditioner starts the anti-freezing protection mode within a preset time period and the second preset temperature Ts2 corresponding to each time are obtained.

[0035] According to the number of times and the second preset temperature Ts2 corresponding to each time, it is determined whether the air conditioner has a fault.

[0036] If there is a fault, the air conditioner is controlled to send a prompt information to remind the user to clean the filter screen and / or check the refrigerant amount.

[0037] Optionally, the step of obtaining the temperature at a target position in the room where the air conditioner is located and recording the temperature as a second current temperature T2 comprises:

[0038] An infrared image is obtained, and at least two temperature pickup pieces are identified from the infrared image, the temperature pickup pieces being attached to a wall.

[0039] The temperature pickup piece with the highest temperature is determined, and the temperature corresponding to the temperature pickup piece is determined as the second current temperature T2.

[0040] The step of determining whether the second current temperature T2 is greater than a second preset temperature Ts2 comprises:

[0041] The temperature pickup piece with the lowest temperature is determined, and the temperature corresponding to the temperature pickup piece is recorded as a third current temperature T3.

[0042] It is determined whether the difference between the second current temperature T2 and the third current temperature T3 is greater than the second preset temperature Ts2.

[0043] The present application provides an air conditioner in a second aspect, comprising:

[0044] a first temperature detecting device configured to detect a temperature of an evaporator of the air conditioner;

[0045] a second temperature detecting device configured to detect a temperature at a target position in any one of the target positions in the second aspect;

[0046] a controller in communication connection with the first temperature detecting device and the second temperature detecting device respectively;

[0047] a memory storing program instructions configured to enable the air conditioner to execute the control method in any one of the second aspect when the program instructions are executed by the controller.

[0048] Optionally, the second temperature detecting device is configured in a detachable form, so that the second temperature detecting device can be detached from the air conditioner; and the second temperature detecting device is in wireless communication connection with the controller.

[0049] Based on the foregoing description, it can be understood by those skilled in the art that, in the technical solutions of the foregoing aspects of the present application, whether the evaporator is at risk of freezing is determined by determining whether the first current temperature T1 of the evaporator is less than or equal to the first preset temperature Ts1, so that when the evaporator is at risk of freezing, the temperature at the target position in the room where the air conditioner is located is obtained and recorded as the second current temperature T2. Whether the temperature in the room is uniformly distributed is determined by determining whether the second current temperature T2 is greater than the second preset temperature Ts2. When the temperature in the room is not uniformly distributed, one of the position of the horizontal air deflector and the rotating speed of the fan of the air conditioner is adjusted according to a first preset rule. When the one reaches a limit value, the other of the position of the horizontal air deflector and the rotating speed of the fan is adjusted according to a second preset rule. When the other reaches a limit value, the air conditioner is controlled to start the anti-freezing protection mode. It can be seen that, before the evaporator is at risk of freezing and the anti-freezing protection mode is started, the air conditioner can promote the temperature in the room to be uniform by adjusting the horizontal air deflector and the fan, thereby reducing the refrigeration fluctuation of the air conditioner. At the same time, the present application can also reduce the risk of freezing of the evaporator by using the surrounding environment, thereby reducing the possibility of reducing the operating frequency of the compressor to avoid freezing of the evaporator.

[0050] Further, by obtaining the number of times that the air conditioner starts the anti-freezing protection mode in a preset time period and the second preset temperature Ts2 corresponding to each time, whether the air conditioner is faulty is determined according to the number of times and the second preset temperature Ts2 corresponding to each time, so that when the air conditioner is faulty, the air conditioner is controlled to issue a prompt information to prompt the user to clean the filter screen and / or check the amount of refrigerant. It can be seen that, by using the technical means described in this paragraph, the present application can also avoid that the air conditioner normally prompts the user to clean the filter screen and / or check the amount of refrigerant.

[0051] Further, by making the location of the air conditioner and the target location be opposite sides of the room, the determination of whether the temperature in the room is evenly distributed by obtaining the temperature at the target location in the room in which the air conditioner is located is more accurate.

[0052] Further, by configuring the second temperature detection device for detecting the temperature at the target location in the room in a detachable form, the user can arrange the second temperature detection device at a suitable location according to the layout of the room, so that the air conditioner of the present application can be applied to various types of room layouts.

[0053] Further, by providing a switch and an adhesive on the back of the second temperature detection device, the switch is automatically closed and connected in communication with the controller of the air conditioner when the second temperature detection device is removed from the air conditioner or fixed to the wall, and the second temperature detection device is fixed to any position on the wall by the adhesive. Thus, the air conditioner of the present application is more intelligent.

[0054] Other benefits of the present application will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the improvement purposes, features and advantages of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the present application, some embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that the components or parts indicated by the same reference numerals in different drawings are the same or similar; the drawings of the present application are not necessarily drawn to scale with each other.

[0056] In the drawings:

[0057] Figure 1 is a schematic view of the structure of an air conditioner provided by the present application;

[0058] Figure 2 is a schematic view of the cross-section of an indoor unit of an air conditioner provided by the present application;

[0059] Figure 3 is a schematic view of the structure of a refrigerant circulation system of an air conditioner provided by the present application;

[0060] Figure 4 is a schematic block diagram of an air conditioner in some embodiments of the present application;

[0061] Figure 5 is a first axis measurement view of a second temperature detection device in some embodiments of the present application;

[0062] Figure 6 is a second axis measurement view of a second temperature detection device in some embodiments of the present application;

[0063] Figure 7is a main step flow chart of the control method for preventing freezing of the air conditioner in some embodiments of the present application;

[0064] Figure 8 is a scene schematic diagram of detecting temperature in a room in some embodiments of the present application;

[0065] Figure 9 is another scene schematic diagram of detecting temperature in a room in some embodiments of the present application;

[0066] Figure 10 is a step flow chart of the first preset rule in some embodiments of the present application;

[0067] Figure 11 is a step flow chart of the second preset rule in some embodiments of the present application;

[0068] Figure 12 is a step flow chart of the anti-freezing protection mode in some embodiments of the present application;

[0069] Figure 13 is a part of step flow chart of the control method for preventing freezing of the air conditioner in some embodiments of the present application. DETAILED DESCRIPTION

[0070] It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present application, not all embodiments of the present application, and are intended to explain the technical principles of the present application, not to limit the protection scope of the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor shall fall within the protection scope of the present application.

[0071] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0072] Further, it needs to be explained that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection" should be understood in a broad sense, for example, can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] In addition, it needs to be explained that in the description of the present application, the terms "cold" and "heat" are two descriptions of the same physical state. That is, the higher the "cold" of a certain target (such as an evaporator, air, a condenser, etc.), the lower the "heat" it has, and the lower the "cold" it has, the higher the "heat" it has. A certain target absorbs "cold" while releasing "heat", and releases "cold" while absorbing "heat". A certain target preserves "cold" or "heat" to keep the target at its current temperature. "Refrigeration" and "heat absorption" are two descriptions of the same physical phenomenon, that is, a certain target (such as an evaporator) absorbs heat while refrigerating.

[0074] Finally, it needs to be explained that in the description of the present application, each functional module can be a physical module composed of multiple structures, components or electronic elements, or a virtual module composed of multiple programs; each functional module can be a module that exists independently of each other, or a module that is divided by a whole module according to function. Those skilled in the art should understand that as long as the technical solutions described in the present application can be realized, the constituting manner, implementation manner and positional relationship of each functional module can be changed in any way without deviating from the technical principles of the present application, and therefore should fall within the protection scope of the present application.

[0075] As shown in Figure 1 In the present application, the air conditioner includes an outdoor unit 100 and an indoor unit 200, wherein the indoor unit 200 can be a wall-mounted air conditioner or a cabinet air conditioner.

[0076] The structure of the indoor unit 200 of the present application will be described in detail below with reference to Figure 2 and taking the wall-mounted air conditioner as an example.

[0077] As shown in Figure 2As shown, in this invention, the indoor unit 200 includes a casing 210, an evaporator 220, a fan 230, and a horizontal air guide plate 240. The casing 210 has an air inlet 211 and an air outlet 212. The evaporator 220 is disposed inside the casing 210 and is used to cool the air inside the casing 210. The fan 230 is also disposed inside the casing 210 and is used to drive outside air into the casing 210 through the air inlet 211, flow through the evaporator 220, and then flow out through the air outlet 212. The horizontal air guide plate 240 is disposed at the air outlet 212 and is used to guide the direction of the cold air in the vertical direction.

[0078] In this invention, unless otherwise specified, the fans described below refer to the fans 230 in the indoor unit 200.

[0079] In this invention, the horizontal air guide plate 240 guides air from the lowest air guide position ( Figure 1 The horizontal air guide plate 240 is rotated clockwise to its limit position until it reaches the uppermost air guide position. Figure 1 The horizontal air guide plate 240 can be adjusted step by step by rotating counterclockwise to its limit position. For example, each time the horizontal air guide plate 240 is rotated counterclockwise by a preset angle (e.g., 3°, 5°, 8°, etc.), it is adjusted up one level, and the cold air blown out from the air outlet 212 blows more upward.

[0080] like Figure 3 As shown, in this invention, the refrigerant circulation system of the air conditioner mainly includes a compressor 110, a condenser 120, an expansion valve 130, and an evaporator 220. The compressor 110, condenser 120, and expansion valve 130 are arranged in the outdoor unit 100, and the evaporator 220 is arranged in the indoor unit 200. Furthermore, the expansion valve 130 is an electronic expansion valve, enabling the air conditioner to automatically control the opening degree of the expansion valve 130.

[0081] like Figure 4 As shown, in some embodiments of the present invention, the air conditioner further includes a first temperature detection device 310 and a second temperature detection device 320. The first temperature detection device 310 is used to detect the temperature of the evaporator 220. The second temperature detection device 320 is used to detect the temperature at a target location within the room.

[0082] In some embodiments of the present invention, the location of the air conditioner (specifically, the indoor unit 200) and the target location are opposite sides of the room. Furthermore, there can be one or more target locations. Each target location can be equipped with a second temperature detection device 320.

[0083] Furthermore, the first temperature detection device 310 and / or the second temperature detection device 320 can be any feasible device, such as a temperature sensor.

[0084] In some embodiments of the present application, the second temperature detecting device 320 is configured in a detachable form, so that the second temperature detecting device 320 can be detached from the air conditioner (specifically, the indoor unit 200). The second temperature detecting device 320 is wirelessly connected to the controller 400 of the air conditioner.

[0085] As shown in Figure 5 and Figure 6 , the back of the second temperature detecting device 320 is provided with a switch 321 and a back adhesive 322, and the back adhesive 322 is used to fix the second temperature detecting device 320 to the wall. The switch 321 is configured to be closed when the second temperature detecting device 320 is detached from the air conditioner (specifically, the indoor unit 200) or fixed to the wall, so that the second temperature detecting device 320 is powered on and connected to the controller 400 for communication.

[0086] Further, the second temperature detecting device 320 further includes a battery and a solar charging panel. The battery is used to provide the second temperature detecting device 320 with power for detecting temperature and sending temperature signals to the air conditioner. The solar charging panel is used to charge the battery, so as to avoid the user frequently replacing and charging the battery.

[0087] Returning to continue referring to Figure 4 , in some embodiments of the present application, the air conditioner further includes a controller 400 and a memory 500. The controller 400 is connected to the first temperature detecting device 310 and the second temperature detecting device 320 for communication, respectively. The memory 500 stores program instructions 510, which are configured to enable the air conditioner to execute any control method described hereinafter when executed by the controller 400.

[0088] The memory 500 can include a memory and a non-volatile memory, and provide the controller 400 with program instructions 510 and data. Exemplarily, the memory can be a high-speed random access memory (RAM).

[0089] In the present application, the controller 400 is an integrated circuit chip with the ability to process signals. The controller 400 can be a general-purpose processor, such as a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, a microprocessor, and any other conventional processor.

[0090] The control method for preventing freezing of an air conditioner in some embodiments of the present application will be described in detail below with reference to Figures 7 to 12

[0091] As shown in Figure 7 , the control method for preventing freezing of an air conditioner in some embodiments of the present application includes:

[0092] Step S110, obtaining the temperature of the evaporator 220 of the air conditioner and recording it as the first current temperature T1.

[0093] Specifically, when the air conditioner is running in a cooling mode, a dehumidifying mode or other modes that can cool the air inside, the temperature of the evaporator 220 of the air conditioner is obtained in real time by the first temperature detection device 310, and the obtained temperature is recorded as the first current temperature T1.

[0094] Step S120, determining whether the first current temperature T1 is less than or equal to the first preset temperature Ts1 to determine whether the evaporator 220 is at risk of freezing.

[0095] In the present application, if the temperature of the evaporator 220 is less than or equal to the first preset temperature Ts1, it indicates that the evaporator 220 is at risk of freezing. If the evaporator 220 continues to maintain this temperature, freezing will occur. Therefore, the first preset temperature Ts1 can be determined according to multiple experiments to determine the critical temperature at which the evaporator 220 freezes, and the critical temperature is determined as the first preset temperature Ts1. For example, the first preset temperature Ts1 can be -1℃, 0℃, 1℃, etc.

[0096] In the present application, if the temperature of the evaporator 220 is greater than the first preset temperature Ts1, return to continue executing step S110.

[0097] ​Step S130: If the temperature is less than or equal to the target temperature within 600 meters of the room where the air conditioner is located, obtain the temperature and record it as the second current temperature T2.

[0098] like Figure 8 As shown, in some embodiments of the present invention, there is one target location, and the location of the air conditioner and the target location are opposite sides of room 600.

[0099] Alternatively, those skilled in the art can set multiple target locations as needed. Then, step S130 further includes: acquiring the temperature at each target location within the room 600 where the air conditioner is located; recording the average of all temperatures as the second current temperature T2, or recording the highest of all temperatures as the second current temperature T2.

[0100] like Figure 9 As shown, in other embodiments of the present invention, those skilled in the art can replace the second temperature detection device 320 with a temperature pickup plate 330 as needed. There are at least two temperature pickup plates 330. Then, an infrared camera electrically connected to the controller 400 is installed on the indoor unit 200, and the temperature at the target location within the room 600 where the air conditioner is located is obtained through the following steps:

[0101] Step S131: Acquire an infrared image and identify at least two temperature pickup pieces 330 from the infrared image, that is, identify all temperature pickup pieces 330.

[0102] Step S132: Identify the temperature pickup piece 330 with the highest temperature and set its corresponding temperature as the second current temperature T2.

[0103] exist Figure 9 In the illustrated embodiment, the temperature pickup plate 330 can be any thin sheet with good thermal conductivity, such as an iron sheet, copper sheet, aluminum sheet, etc. Furthermore, the surface of the temperature pickup plate 330 can be coated with various colors to match the color of the wall.

[0104] Those skilled in the art will understand that by replacing the second temperature detection device 320 with the temperature pickup plate 330, the temperature pickup plate 330 can be integrated with the wall, making it more aesthetically pleasing.

[0105] Step S140: Determine whether the second current temperature T2 is greater than the second preset temperature Ts2, so as to determine whether the temperature distribution in room 600 is uniform.

[0106] The second preset temperature Ts2 is the set temperature that the user sets for the air conditioner. For example, if the user sends a temperature setting command to the air conditioner via remote control and adjusts the set temperature to 24℃, then the second preset temperature Ts2 is 24℃.

[0107] The skilled in the art can understand that, when the air conditioner is cooling or dehumidifying the room 600, the air conditioner cannot uniformly cool the room 600 due to the arrangement position of the indoor unit 200, the cold air being heavier than the hot air and other factors, resulting in the temperature in the room 600 being uneven. Even, there is a dead angle of air flow in the room 600, and the air in the dead angle does not participate in the air circulation formed when the air conditioner is cooling, resulting in the temperature in the dead angle being higher. The application can automatically determine whether the temperature in the room 600 is uniformly distributed by comparing the second current temperature T2 and the second preset temperature Ts2.

[0108] Specifically, when the second current temperature T2 is greater than the second preset temperature Ts2, it indicates that the temperature in the room 600 is unevenly distributed. When the second current temperature T2 is less than or equal to the second preset temperature Ts2, it indicates that the temperature in the room 600 is uniformly distributed.

[0109] In the application, the target position includes a dead angle position not participating in the air circulation.

[0110] Corresponding to the embodiment shown in Figure 9 , the step S140 can further include:

[0111] Step S141, determining the temperature pickup piece 330 with the lowest temperature and recording the temperature corresponding thereto as a third current temperature T3;

[0112] Step S142, determining whether the difference between the second current temperature T2 and the third current temperature T3 is greater than the second preset temperature Ts2.

[0113] In the step S142, the second preset temperature Ts2 is different from the set temperature described above, and is a value representing the uniformity of the temperature in the room 600. Specifically, the second preset temperature Ts2 can be 1℃, 2℃, 2.5℃, 3℃, etc.

[0114] Step S150, if greater, adjusting one of the position of the horizontal air deflector 240 and the rotating speed of the fan 230 of the air conditioner according to the first preset rule.

[0115] Optionally, as shown in Figure 10 , the step S150 further includes:

[0116] Step S151, gradually increasing the blowing position of the horizontal air deflector 240 of the air conditioner.

[0117] Specifically, the blowing position of the horizontal air deflector 240 of the air conditioner is gradually increased according to a preset angle.

[0118] The preset angle can be any feasible angle such as 3°, 5°, 8°, etc.

[0119] Step S152, after adjusting the first preset time t1 each time, the first current temperature T1 is acquired again.

[0120] The first preset time t1 can be 30S, 1min, 90S, or any feasible time.

[0121] Step S153, if the first current temperature T1 is greater than the first preset temperature Ts1, the horizontal deflector 240 is controlled to keep the current position.

[0122] Step S154, if the first current temperature T1 is less than or equal to the first preset temperature Ts1, the blowing position of the horizontal deflector 240 of the air conditioner is continued to be adjusted upward until the horizontal deflector 240 is adjusted to the limit value.

[0123] Step S160, if the one item reaches the limit value, the other one of the position of the horizontal deflector 240 and the rotating speed of the fan 230 is adjusted according to the second preset rule.

[0124] Optionally, as shown in the step S160, the step S160 further includes: Figure 11

[0125] Step S161, if the horizontal deflector 240 is adjusted to the limit value and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the rotating speed of the fan 230 of the air conditioner is adjusted step by step.

[0126] The step by step adjustment of the rotating speed of the fan 230 of the air conditioner includes: the rotating speed of the fan 230 is increased by a preset rotating speed each time, so that the rotating speed of the fan 230 is adjusted by one level. The preset rotating speed can be 50r / min, 80r / min, 150r / min, 300r / min, or any feasible rotating speed.

[0127] Step S162, after adjusting the second preset time t2 each time, the first current temperature T1 is acquired again.

[0128] The second preset time t2 can be the same as or different from the first preset time t1.

[0129] Step S163, if the first current temperature T1 is greater than the first preset temperature Ts1, the fan 230 is controlled to keep the current rotating speed.

[0130] Step S164, if the first current temperature T1 is less than or equal to the first preset temperature Ts1, the rotating speed of the fan 230 is continued to be adjusted upward until the rotating speed of the fan 230 is adjusted to the limit value.

[0131] Step S170, if the other one reaches the limit value, the air conditioner is controlled to start the anti-freezing protection mode.

[0132] Optionally, as shown in the step S170, the step S170 further includes:​Figure 12 As shown, step S170 includes:

[0133] Step S171: Gradually increase the opening of the air conditioner's expansion valve 130.

[0134] Specifically, each increase in the opening degree of expansion valve 130 can increase the opening degree of expansion valve 130 by any feasible value such as 5%, 10%, 15%, or 20%.

[0135] Step S172: After each adjustment of the third preset duration t3, obtain the first current temperature T1.

[0136] The third preset duration t3 can be any feasible duration such as 30S, 60S, 90S, 2min, etc.

[0137] Step S173: If the first current temperature T1 is greater than the first preset temperature Ts1, control the expansion valve 130 to maintain the current opening.

[0138] In step S174, if the opening of the expansion valve 130 is adjusted to the limit value and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the compressor 110 of the air conditioner is controlled to reduce its frequency until it stops.

[0139] The process of controlling the air conditioner compressor 110 to reduce its frequency until it stops includes: after each frequency reduction, the compressor 110 acquires the first current temperature T1 again after a certain period of time (e.g., 30 seconds, 1 minute, 90 seconds, or any feasible duration). If the first current temperature T1 is greater than the first preset temperature Ts1, it indicates that the evaporator 220 is not at risk of freezing, and the compressor 110 is controlled to maintain its current frequency. If the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the compressor 110 is controlled to continue reducing its frequency until it stops.

[0140] Based on the foregoing description, those skilled in the art will understand that, before the evaporator 220 is at risk of freezing and the anti-freeze protection mode is activated, the present invention can promote uniform temperature in the room and reduce cooling fluctuations by adjusting the horizontal air guide plate 240 and the fan 230. Simultaneously, the present invention can also utilize the surrounding environment to reduce the risk of the evaporator 20 freezing, thereby reducing the possibility that the air conditioner will reduce the operating frequency of the compressor 110 to avoid freezing the evaporator 220.

[0141] like Figure 13 As shown, in some other embodiments of the present invention, compared with some embodiments described above, the air conditioner anti-freezing control method further includes:

[0142] Step S210: Obtain the number of times the air conditioner activates the anti-freeze protection mode within a preset time period, and the corresponding second preset temperature Ts2 for each activation.

[0143] As described before, the second preset temperature Ts2 is the set temperature set by the user to the air conditioner. Therefore, the value of the second preset temperature Ts2 corresponding to each time when the air conditioner starts the anti-freezing protection mode can be different.

[0144] In some other embodiments of the present application, the preset time period can be any feasible time period, such as 1 day, 1 week, 1 month, etc.

[0145] In step S220, it is determined whether the air conditioner has a fault according to the number of times and the second preset temperature Ts2 corresponding to each time.

[0146] Specifically, it is determined whether the number of times reaches M times and the second preset temperature Ts2 corresponding to at least N times is greater than the third preset temperature.

[0147] In the case that the air conditioner is in normal cooling or dehumidifying, if the second preset temperature Ts2 is greater than the third preset temperature, the temperature of the surface of the evaporator 220 will not be reduced to the freezing critical point. Therefore, the third preset temperature can be obtained through multiple tests. Specifically, the third preset temperature can be 25℃, 26℃, 28℃, 30℃, etc.

[0148] On the contrary, in the case that the air conditioner is in normal cooling or dehumidifying, if the second preset temperature Ts2 is greater than the third preset temperature, the temperature of the surface of the evaporator 220 is reduced to the freezing critical point, which indicates that the air conditioner has a fault.

[0149] In some other embodiments of the present application, when the number of times reaches M times and the second preset temperature Ts2 corresponding to at least N times is greater than the third preset temperature, it indicates that the air conditioner has a fault; otherwise, no fault occurs.

[0150] In the case that the air conditioner is in normal cooling or dehumidifying, if the second preset temperature Ts2 is greater than the third preset temperature, the temperature of the surface of the evaporator 220 will not be reduced to the freezing critical point. Therefore, the third preset temperature can be obtained through multiple tests. Specifically, the third preset temperature can be 25℃, 26℃, 28℃, 30℃, etc.

[0151] In step S230, if a fault exists, the air conditioner is controlled to issue a prompt information to remind the user to clean the filter screen and / or check the amount of refrigerant.

[0152] Based on the foregoing description, those skilled in the art can understand that some other embodiments of the present application can also prevent the air conditioner from incorrectly reminding the user to clean the filter screen and / or check the amount of refrigerant when the air conditioner is in normal operation, thereby ensuring the reliability of the air conditioner in operation.

[0153] So far, the technical solutions of the present application have been described in combination with the foregoing embodiments, but those skilled in the art can easily understand that the protection scope of the present application is not limited to these specific embodiments. Those skilled in the art can split and combine the technical solutions in the above-mentioned embodiments, or make equivalent changes or replacements to the related technical features, without departing from the technical principles of the present application. Any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present application will fall within the protection scope of the present application.

Claims

1. A control method for preventing freezing of an air conditioner, comprising: obtaining a temperature of an evaporator of the air conditioner and recording the temperature as a first current temperature T1; determining whether the first current temperature T1 is less than or equal to a first preset temperature Ts1 to determine whether the evaporator is at risk of freezing; if yes, obtaining a temperature at a target position in a room in which the air conditioner is located and recording the temperature as a second current temperature T2; determining whether the second current temperature T2 is greater than a second preset temperature Ts2 to determine whether the temperature in the room is evenly distributed; if yes, adjusting one of a position of a horizontal air deflector and a rotating speed of a fan of the air conditioner according to a first preset rule; if the one reaches a limit value, adjusting the other of the position of the horizontal air deflector and the rotating speed of the fan according to a second preset rule; if the other reaches the limit value, controlling the air conditioner to start a freezing prevention protection mode. 2.The control method according to claim 1, wherein the position in which the air conditioner is located and the target position are opposite sides of the room. 3.The control method according to claim 1, wherein the target position is a plurality of positions; the step of obtaining the temperature at the target position in the room in which the air conditioner is located and recording the temperature as the second current temperature T2 comprises: obtaining the temperature at each of the target positions in the room in which the air conditioner is located; recording an average of all the temperatures as the second current temperature T2, or recording a maximum one of all the temperatures as the second current temperature T2. 4.The control method according to claim 1, wherein the step of adjusting the one of the position of the horizontal air deflector and the rotating speed of the fan of the air conditioner according to the first preset rule comprises: gradually increasing the blowing position of the horizontal air deflector of the air conditioner; after each adjustment for a first preset time t1, obtaining the first current temperature T1 again; if the first current temperature T1 is greater than the first preset temperature Ts1, controlling the horizontal air deflector to keep the current position; if the first current temperature T1 is less than or equal to the first preset temperature Ts1, continuing to increase the blowing position of the horizontal air deflector of the air conditioner until the horizontal air deflector reaches a limit value. 5.The control method according to claim 4, wherein the step of adjusting the other of the position of the horizontal air deflector and the rotating speed of the fan according to the second preset rule if the one reaches the limit value comprises: if the horizontal air deflector reaches the limit value and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, gradually increasing the rotating speed of the fan of the air conditioner; after each adjustment for a second preset time t2, obtaining the first current temperature T1 again; if the first current temperature T1 is greater than the first preset temperature Ts1, controlling the fan to keep the current rotating speed; if the first current temperature T1 is less than or equal to the first preset temperature Ts1, continuing to increase the rotating speed of the fan until the rotating speed of the fan reaches a limit value. 6.The control method according to claim 1, wherein The step of controlling the air conditioner to start the anti-freezing protection mode comprises: gradually increasing the opening degree of the expansion valve of the air conditioner; after each adjustment for the third preset time t3, obtaining the first current temperature T1; if the first current temperature T1 is greater than the first preset temperature Ts1, controlling the expansion valve to keep the current opening degree; if the opening degree of the expansion valve is increased to a limit value and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, controlling the compressor of the air conditioner to reduce the frequency until it stops.

7. The control method according to claim 1, further comprising: obtaining the number of times that the air conditioner starts the anti-freezing protection mode in a preset time period and the second preset temperature Ts2 corresponding to each time; determining whether the air conditioner has a fault according to the number of times and the second preset temperature Ts2 corresponding to each time; if there is a fault, controlling the air conditioner to send a prompt information to remind the user to clean the filter screen and / or check the amount of refrigerant.

8. The control method according to any one of claims 1 to 7, wherein the step of obtaining the temperature at the target position in the room where the air conditioner is located and recording it as the second current temperature T2 comprises: obtaining an infrared image and identifying at least two temperature pickup pieces from the infrared image, the temperature pickup pieces being attached to the wall; determining the temperature pickup piece with the highest temperature and determining the temperature corresponding thereto as the second current temperature T2; the step of determining whether the second current temperature T2 is greater than the second preset temperature Ts2 comprises: determining the temperature pickup piece with the lowest temperature and recording the temperature corresponding thereto as the third current temperature T3; determining whether the difference between the second current temperature T2 and the third current temperature T3 is greater than the second preset temperature Ts2.

9. An air conditioner comprising: a first temperature detection device for detecting the temperature of the evaporator of the air conditioner; a second temperature detection device for detecting the temperature at the target position according to any one of claims 1 to 8; a controller in communication connection with the first temperature detection device and the second temperature detection device, respectively; a memory storing program instructions, the program instructions being configured to enable the air conditioner to perform the control method according to any one of claims 1 to 8 when executed by the controller.

10. The air conditioner according to claim 9, wherein the second temperature detection device is configured in a detachable form so that the second temperature detection device can be detached from the air conditioner; the second temperature detection device is in wireless communication connection with the controller.

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