Air conditioner anti-freezing control method and air conditioner applying same

Abstract

The invention provides an air conditioner anti-freezing control method and an air conditioner applying the same. The control method comprises the steps that the temperature of an evaporator of the air conditioner is obtained and recorded as the first current temperature T1; whether the first current temperature T1 is smaller than or equal to a first preset temperature Ts1 or not is determined so as to determine whether the evaporator has a freezing risk or not; if not, the temperature of the target position in the room where the air conditioner is located is obtained and recorded as the second current temperature T2; determining whether the second current temperature T2 is greater than a second preset temperature Ts2 or not so as to determine whether the temperature in the room is uniformly distributed or not; if yes, one of the position of a transverse air guide plate of the air conditioner and the rotating speed of a fan is adjusted according to a first preset rule; if one item reaches the limit value, the other item of the position of the transverse air guide plate and the rotating speed of the fan is adjusted according to a second preset rule; and if the other item reaches the limit value, the air conditioner is controlled to start an anti-freezing protection mode. The risk that the evaporator is frozen can be reduced through the surrounding environment.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioners, and specifically provides an air conditioner anti-freezing control method and an air conditioner using the same. Background Art

[0002] When the existing air conditioner is running in cooling mode, dehumidification mode or other modes that can cool the air inside, it is easy to cause the temperature of the evaporator surface to be too low and ice to form due to factors such as low inlet air temperature, insufficient air volume, insufficient refrigerant circulation, etc., that is, the evaporator is frozen. When the evaporator is frozen, it will not only affect the cooling efficiency of the evaporator for the air, but also cause the air conditioner to blow water, blow ice, etc.

[0003] In order to overcome the above problems, existing air conditioners usually reduce the frequency of the compressor or even shut down the compressor when operating in cooling mode or dehumidification mode to reduce the cooling power of the evaporator. However, this will cause the air conditioner to be frequently shut down and started, resulting in large fluctuations in the cooling temperature, which affects the user experience. Summary of the invention

[0004] An object of the present invention is to solve the problem that the frequency of the compressor of the existing air conditioner is frequently adjusted when there is a risk of freezing of the evaporator, resulting in large fluctuations in the refrigeration temperature.

[0005] Another object of the present invention is to enable an air conditioner to utilize the surrounding environment to reduce the risk of the evaporator being frozen.

[0006] To achieve the above object, the present invention provides, in a first aspect, a method for controlling air conditioner anti-freezing, comprising:

[0007] Obtaining the temperature of the evaporator of the air conditioner and recording it as the 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 has a freezing risk;

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

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

[0011] If it is greater than, adjusting one of the position of the transverse air guide plate of the air conditioner and the speed of the fan according to a first preset rule;

[0012] If one of the items reaches a limit value, adjusting the other of the position of the transverse air guide plate and the rotation 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 an anti-freeze protection mode.

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

[0015] Optionally, there are multiple target locations;

[0016] 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 includes:

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

[0018] The average value of all temperatures is recorded as the second current temperature T2, or the maximum temperature of all temperatures is recorded as the second current temperature T2.

[0019] Optionally, the step of adjusting one of a position of a transverse air guide plate and a rotation speed of a fan of the air conditioner according to a first preset rule comprises:

[0020] gradually increasing the blowing position of the transverse air guide plate of the air conditioner;

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

[0022] If the first current temperature T1 is greater than the first preset temperature Ts1, controlling the transverse air guide plate to maintain a 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 transverse air guide plate of the air conditioner continues to be adjusted upward until the transverse air guide plate is adjusted upward to a limit value.

[0024] Optionally, if one of the items reaches a limit value, the step of adjusting the other of the position of the transverse air guide plate and the rotation speed of the fan according to a second preset rule comprises:

[0025] If the transverse air guide plate 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 speed of the fan of the air conditioner is gradually increased;

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

[0027] If the first current temperature T1 is greater than the first preset temperature Ts1, controlling the fan to maintain the current speed;

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

[0029] Optionally, the step of controlling the air conditioner to start an anti-freeze protection mode includes:

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

[0031] After each adjustment of the third preset time length t3, the first current temperature T1 is obtained;

[0032] If the first current temperature T1 is greater than the first preset temperature Ts1, controlling the expansion valve to maintain a current opening;

[0033] If the opening of the expansion valve is increased to the 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 it stops.

[0034] Optionally, obtaining the number of times the air conditioner turns on the anti-freeze protection mode within a preset time period, and the second preset temperature Ts2 corresponding to each time;

[0035] Determine whether the air conditioner has a fault according to the number of times and the second preset temperature Ts2 corresponding to each time;

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

[0037] Optionally, the step of 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 includes:

[0038] Acquire an infrared image, and identify at least two temperature pickup sheets from the infrared image, wherein the temperature pickup sheets are attached to the wall;

[0039] Determine a temperature pickup piece with the highest temperature, and determine the corresponding temperature as the second current temperature T2;

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

[0041] Determine a temperature pickup piece with the lowest temperature, and record the corresponding temperature as the 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] In a second aspect, the present invention provides an air conditioner, comprising:

[0044] A first temperature detection device, used to detect the temperature of the evaporator of the air conditioner;

[0045] A second temperature detection device, used to detect the temperature at the target position described in any one of the second aspects;

[0046] a controller, connected to the first temperature detection device and the second temperature detection device for communication;

[0047] A memory stores program instructions, wherein the program instructions are configured to enable the air conditioner to execute any one of the control methods described in the second aspect when executed by the controller.

[0048] Optionally, the second temperature detection device is configured in a detachable form so that the second temperature detection device can be removed from the air conditioner; the second temperature detection device is wirelessly connected to the controller.

[0049] Based on the foregoing description, it can be understood by those skilled in the art that in the aforementioned technical solution of the present invention, by determining whether the first current temperature T1 of the evaporator is less than or equal to the first preset temperature Ts1, it is determined whether the evaporator has a risk of freezing, so that when there is a 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. By determining whether the second current temperature T2 is greater than the second preset temperature Ts2, it is determined whether the temperature in the room is evenly distributed. And when the temperature distribution in the room is uneven, one of the position of the transverse air guide plate of the air conditioner and the speed of the fan is adjusted according to the first preset rule. When the one reaches the limit value, the other of the position of the transverse air guide plate and the speed of the fan is adjusted according to the second preset rule. When the other reaches the limit value, the air conditioner is controlled to turn on the anti-freezing protection mode. It can be seen that the present invention can make the temperature in the room uniform by adjusting the transverse air guide plate and the fan before the anti-freezing protection mode is turned on when there is a risk of freezing of the evaporator and before turning on the anti-freezing protection mode, thereby reducing the refrigeration fluctuation of the air conditioner. At the same time, the present invention can also use the surrounding environment to reduce the risk of the evaporator being frozen, thereby reducing the possibility that the air conditioner reduces the operating frequency of the compressor to avoid freezing of the evaporator.

[0050] Furthermore, by obtaining the number of times the air conditioner turns on the anti-freeze protection mode within a preset time period, and the second preset temperature Ts2 corresponding to each time; then according to the number and the second preset temperature Ts2 corresponding to each time, it is determined whether the air conditioner has a fault; when a fault exists, the air conditioner is controlled to send a reminder message to remind the user to clean the filter and / or check the amount of refrigerant. It can be seen that the present invention also avoids erroneously reminding the user to clean the filter and / or check the amount of refrigerant when the air conditioner is normal through the technical means described in this paragraph.

[0051] Furthermore, by making the location of the air conditioner and the target location on opposite sides of the room, it is more accurate to determine whether the temperature in the room is evenly distributed by obtaining the temperature at the target location in the room where the air conditioner is located.

[0052] Furthermore, by configuring the second temperature detection device for detecting the temperature at a target position in the room to be detachable, the user can place the second temperature detection device at a suitable position according to the layout of the room, so that the present invention can be applied to various types of room layouts.

[0053] Furthermore, by arranging a switch and adhesive on the back of the second temperature detection device, when the second temperature detection device is removed from the air conditioner or fixed to the wall, the switch is automatically closed and connected to the controller of the air conditioner for communication, and is fixed to any position on the wall by the adhesive. It can be seen that the air conditioner of the present invention is more intelligent.

[0054] Other beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can more clearly understand the improved purposes, features and advantages of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solution of the present invention, some embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the same reference numerals indicate the same or similar components or parts in different drawings; the drawings of the present invention are not necessarily drawn to scale.

[0056] In the attached figure:

[0057] Figure 1 It is a schematic diagram of the structure of an air conditioner provided by the present invention;

[0058] Figure 2 It is a cross-sectional schematic diagram of an indoor unit of an air conditioner provided by the present invention;

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

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

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

[0062] Figure 6 is a second isometric view of a second temperature detection device in some embodiments of the present invention;

[0063] Figure 7is a flow chart of the main steps of the air conditioner anti-freezing control method in some embodiments of the present invention;

[0064] Figure 8 is a schematic diagram of a scenario for detecting the temperature in a room in some embodiments of the present invention;

[0065] Fig. 9 is another schematic diagram of a scenario for detecting the temperature in a room in some embodiments of the present invention;

[0066] Fig.10 is a flow chart of steps of a first preset rule in some embodiments of the present invention;

[0067] Fig.11 is a flow chart of steps of a second preset rule in some embodiments of the present invention;

[0068] Fig.12 is a flowchart of steps of an anti-freeze protection mode in some embodiments of the present invention;

[0069] Fig.13 It is a partial step flow chart of the air conditioner anti-freezing control method in other embodiments of the present invention. DETAILED DESCRIPTION

[0070] It should be understood by those skilled in the art that the embodiments described below are only some embodiments of the present invention, rather than all embodiments of the present invention, and these embodiments are intended to explain the technical principles of the present invention, rather than to limit the protection scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should still fall within the protection scope of the present invention.

[0071] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0072] Furthermore, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] In addition, it should be noted that in the description of the present invention, the terms "cold" and "heat" are two descriptions of the same physical state. That is, the higher the "cold" of a certain target object (such as an evaporator, air, condenser, etc.), the lower the "heat" it has, and the lower the "cold" it has, the higher the "heat" it has. A certain target object will release "heat" while absorbing "cold", and will absorb "heat" while releasing "cold". A certain target object stores "cold" or "heat" to keep the current temperature of the target object. "Refrigeration" and "heat absorption" are two descriptions of the same physical phenomenon, that is, a certain target object (such as an evaporator) will absorb heat while cooling.

[0074] Finally, it should be noted that in the description of the present invention, each functional module can be a physical module composed of multiple structures, components or electronic components, or a virtual module composed of multiple programs; each functional module can be a module that exists independently of each other, or a module divided according to the function of an integral module. Those skilled in the art should understand that, under the premise of being able to implement the technical solution described in the present invention, no matter how the composition, implementation and positional relationship of each functional module change, they will not deviate from the technical principle of the present invention, and therefore should fall within the protection scope of the present invention.

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

[0076] Refer to the following Figure 2 The structure of the indoor unit 200 of the present invention is described in detail by taking the on-hook unit as an example.

[0077] like Figure 2As shown, in the present invention, the indoor unit 200 includes a housing 210, an evaporator 220, a fan 230 and a transverse air guide plate 240. The housing 210 is provided with an air inlet 211 and an air outlet 212. The evaporator 220 is arranged in the housing 210 for cooling the air in the housing 210. The fan 230 is also arranged in the housing 210 for driving the outside air to enter the housing 210 from the air inlet 211, flow through the evaporator 220 and then flow out from the air outlet 212. The transverse air guide plate 240 is arranged at the air outlet 212 for guiding the blowing direction of the cold air in the up and down directions.

[0078] In the present invention, unless otherwise specified, the fans described below are all fans 230 in the indoor unit 200 .

[0079] In the present invention, the transverse air guide plate 240 is located at the lowest air guide position ( Figure 1 The transverse air guide plate 240 in the middle rotates clockwise to the limit position) to the uppermost air guide position ( Figure 1 The horizontal air guide plate 240 in the air outlet 212 is rotated counterclockwise to the limit position), and can be adjusted step by step. For example, the horizontal air guide plate 240 is rotated counterclockwise by a preset angle (such as 3°, 5°, 8°, etc.) to achieve an upward adjustment, and the cold air blown out from the air outlet 212 is blown more upward.

[0080] like Figure 3 As shown, in the present 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, the condenser 120 and the expansion valve 130 are arranged in the outdoor unit 100, and the evaporator 220 is arranged in the indoor unit 200. Further, the expansion valve 130 is an electronic expansion valve, so that the air conditioner can automatically control the opening 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 position in 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. In addition, the target location can be one or more. Each target location can be respectively configured with a second temperature detection device 320.

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

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

[0085] like Figure 5 and Figure 6 As shown, a switch 321 and adhesive 322 are provided on the back of the second temperature detection device 320, and the adhesive 322 is used to fix the second temperature detection device 320 to the wall. The switch 321 is configured to be closed when the second temperature detection device 320 is removed from the air conditioner (specifically the indoor unit 200) or fixed to the wall, so that the second temperature detection device 320 is turned on and communicated with the controller 400.

[0086] Furthermore, the second temperature detection device 320 also includes a battery and a solar charging panel, wherein the battery is used to provide the second temperature detection device 320 with electric energy for detecting temperature and sending a temperature signal to the air conditioner. The solar charging panel is used to charge the battery to avoid users frequently changing and charging batteries.

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

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

[0089] In the present invention, the controller 400 is an integrated circuit chip having the ability to process signals. The controller 400 may 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 devices, discrete gate or transistor logic devices, discrete hardware components, microprocessors, and any other conventional processors.

[0090] Refer to the following Figures 7 to 12 The air conditioner anti-freezing control method in some embodiments of the present invention is described in detail.

[0091] like Figure 7 As shown, in some embodiments of the present invention, the air conditioner anti-freezing control method 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 operates in a cooling mode, a dehumidification mode or other modes capable of cooling the air therein, the temperature of the evaporator 220 of the air conditioner is acquired in real time by the first temperature detection device 310, and the acquired 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 , so as to determine whether the evaporator 220 has a freezing risk.

[0095] In the present invention, if the temperature of the evaporator 220 is less than or equal to the first preset temperature Ts1, it means that the evaporator 220 is at risk of freezing. If the evaporator 220 continues to maintain this temperature, freezing will occur. To this end, the first preset temperature Ts1 can be determined based on multiple experiments to determine the critical temperature of the evaporator 220 freezing, and the critical temperature is determined as the first preset temperature Ts1. For example, the first preset temperature Ts1 can be -1°C, 0°C, 1°C, etc.

[0096] In the present invention, if the temperature of the evaporator 220 is greater than the first preset temperature Ts1, the process returns to step S110.

[0097] Step S130: If it is less than or equal to, obtain the temperature at the target position in the room 600 where the air conditioner is located, 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 where the air conditioner is located and the target location are on opposite sides of the room 600 .

[0099] Alternatively, those skilled in the art may also set multiple target positions as needed. Then, step S130 further includes: obtaining the temperature at each target position in the room 600 where the air conditioner is located; recording the average value of all temperatures as the second current temperature T2, or recording the maximum temperature among all temperatures as the second current temperature T2.

[0100] like Fig. 9 As shown, in other embodiments of the present invention, those skilled in the art may also replace the second temperature detection device 320 with a temperature pickup sheet 330 as needed. There are at least two temperature pickup sheets 330. Then, an infrared camera electrically connected to the controller 400 is provided on the indoor unit 200, and the temperature at the target position in the room 600 where the air conditioner is located is obtained by the following steps:

[0101] Step S131 , acquiring an infrared image, and identifying at least two temperature pickup plates 330 from the infrared image, that is, identifying all the temperature pickup plates 330 .

[0102] Step S132, determining a temperature pickup plate 330 with the highest temperature, and determining the corresponding temperature as the second current temperature T2.

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

[0104] Those skilled in the art can understand that by replacing the second temperature detection device 320 with the temperature pickup sheet 330 , the temperature pickup sheet 330 can be integrated with the wall, which is more beautiful.

[0105] Step S140, determining whether the second current temperature T2 is greater than the second preset temperature Ts2, so as to determine whether the temperature in the room 600 is evenly distributed.

[0106] The second preset temperature Ts2 is a set temperature set by the user for the air conditioner. For example, the user sends a temperature setting instruction to the air conditioner through a remote controller and adjusts the set temperature to 24°C, then the second preset temperature Ts2 is 24°C.

[0107] It is understood by those skilled in the art that when the air conditioner cools or dehumidifies the room 600, it is limited by the arrangement position of the indoor unit 200, the cold air is heavier than the hot air, and other factors, which result in the air conditioner often failing to cool the room 600 evenly, causing the temperature in the room 600 to be uneven. In fact, there may be dead corners of air flow in the room 600, and the air in the dead corners does not participate in the air circulation formed when the air conditioner cools, resulting in a higher temperature in the dead corners. However, the present invention enables the air conditioner to automatically determine whether the temperature in the room 600 is evenly distributed by comparing the second current temperature T2 with 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 distribution in the room 600 is uneven. When the second current temperature T2 is less than or equal to the second preset temperature Ts2, it indicates that the temperature distribution in the room 600 is uniform.

[0109] In the present invention, the target position includes a dead-angle position that does not participate in air circulation.

[0110] and Fig. 9 Corresponding to the embodiment shown in , step S140 may further include:

[0111] Step S141, determining a temperature pickup plate 330 with the lowest temperature, and recording the corresponding temperature as the 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 step S142, the second preset temperature Ts2 is different from the set temperature described above, and is a value representing the temperature uniformity in the room 600. Specifically, the second preset temperature Ts2 can be 1°C, 2°C, 2.5°C, 3°C, etc.

[0114] Step S150: If it is greater than, adjust one of the position of the transverse air guide plate 240 of the air conditioner and the speed of the fan 230 according to a first preset rule.

[0115] Alternatively, if Fig.10 As shown, step S150 further includes:

[0116] Step S151, gradually increase the blowing position of the transverse air guide plate 240 of the air conditioner.

[0117] Specifically, the blowing position of the lateral air guide plate 240 of the air conditioner is gradually increased according to the preset angle.

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

[0119] Step S152: after adjusting the first preset time duration t1 each time, obtaining the first current temperature T1 again.

[0120] The first preset time length t1 may be any feasible time length such as 30 seconds, 1 minute, or 90 seconds.

[0121] Step S153: if the first current temperature T1 is greater than the first preset temperature Ts1, the transverse air guide plate 240 is controlled to maintain the current position.

[0122] Step S154: if the first current temperature T1 is less than or equal to the first preset temperature Ts1, continue to increase the blowing position of the transverse air guide plate 240 of the air conditioner until the transverse air guide plate 240 is increased to a limit value.

[0123] Step S160: If the one item reaches the limit value, adjust the other item of the position of the transverse air guide plate 240 and the rotation speed of the fan 230 according to a second preset rule.

[0124] Alternatively, if Fig.11 As shown, step S160 further includes:

[0125] Step S161: if the transverse air guide plate 240 is adjusted upward to the limit value and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the rotation speed of the air conditioner fan 230 is gradually increased.

[0126] Wherein, gradually increasing the speed of the air conditioner fan 230 includes: increasing the preset speed each time to increase the speed of the fan 230 by one level. The preset speed is any feasible speed such as 50r / min, 80r / min, 150r / min, 300r / min, etc.

[0127] Step S162: after each adjustment of the second preset time length t2, the first current temperature T1 is obtained again.

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

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

[0130] Step S164: if the first current temperature T1 is less than or equal to the first preset temperature Ts1, the rotation speed of the fan 230 continues to be increased until the rotation speed of the fan 230 is increased to a limit value.

[0131] Step S170: If the other item reaches a limit value, the air conditioner is controlled to start an anti-freezing protection mode.

[0132] Alternatively, if Fig.12 As shown, step S170 includes:

[0133] Step S171, gradually increasing the opening of the expansion valve 130 of the air conditioner.

[0134] Specifically, each time the opening of the expansion valve 130 is increased by one level, the opening of the expansion valve 130 can be increased by any feasible value such as 5%, 10%, 15%, or 20%.

[0135] Step S172: After each adjustment of the third preset time length t3, the first current temperature T1 is obtained.

[0136] The third preset time length t3 may be any feasible time length such as 30S, 60S, 90S, or 2min.

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

[0138] Step S174: if the opening of the expansion valve 130 is increased 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 the frequency until it stops.

[0139] Among them, controlling the compressor 110 of the air conditioner to reduce the frequency until it stops includes: after each frequency reduction of the compressor 110, the first current temperature T1 is obtained again after a period of time (for example, 30S, 1min, 90S, or any feasible time). If the first current temperature T1 is greater than the first preset temperature Ts1, it means that there is no risk of freezing of the evaporator 220, and the compressor 110 is controlled to maintain the 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 to reduce the frequency until it stops.

[0140] Based on the above description, those skilled in the art can understand that, when there is a risk of freezing of the evaporator 220 and before the anti-freezing protection mode is turned on, the present invention can adjust the transverse air guide plate 240 and the fan 230 to make the temperature in the room uniform and reduce the cooling fluctuation of the air conditioner. At the same time, the present invention can also use the surrounding environment to reduce the risk of the evaporator 20 being frozen, thereby reducing the possibility of the air conditioner reducing the operating frequency of the compressor 110 to avoid freezing of the evaporator 220.

[0141] like Fig.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, obtaining the number of times the air conditioner turns on the anti-freeze protection mode within a preset time period, and the second preset temperature Ts2 corresponding to each time.

[0143] As described above, the second preset temperature Ts2 is a set temperature set by the user for the air conditioner. Therefore, each time the air conditioner turns on the anti-freeze protection mode, the corresponding value of the second preset temperature Ts2 may also be different.

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

[0145] Step S220, determining 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 whether the second preset temperature Ts2 corresponding to at least N times is greater than the third preset temperature.

[0147] When the air conditioner is cooling or dehumidifying normally, if the second preset temperature Ts2 is greater than the third preset temperature, the temperature on the surface of the evaporator 220 will not drop to the freezing critical point. To this end, the third preset temperature can be obtained through multiple tests, and specifically, the third preset temperature can be 25°C, 26°C, 28°C, 30°C, etc.

[0148] On the contrary, when the air conditioner is cooling or dehumidifying normally, if the second preset temperature Ts2 is greater than the third preset temperature, the temperature of the surface of the evaporator 220 drops to the freezing critical point, indicating that the air conditioner has a fault.

[0149] In other embodiments of the present invention, when the number 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, there is no fault.

[0150] Wherein, M is a natural number not less than 2, and N is a natural number not less than 1.

[0151] Step S230: If there is a fault, the air conditioner is controlled to send a reminder message to remind the user to clean the filter and / or check the amount of refrigerant.

[0152] Based on the foregoing description, those skilled in the art will appreciate that other embodiments of the present invention can also prevent the user from being erroneously reminded to clean the filter and / or check the amount of refrigerant when the air conditioner is operating normally, thereby ensuring the reliability of the air conditioner during operation.

[0153] So far, the technical solution of the present invention has been described in combination with the above multiple embodiments, but it is easy for those skilled in the art to understand that the protection scope of the present invention is not limited to these specific embodiments. Without departing from the technical principles of the present invention, those skilled in the art can split and combine the technical solutions in the above embodiments, and can also make equivalent changes or replacements to the relevant technical features. Any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present invention will fall within the protection scope of the present invention.

Claims

1. A method for controlling air conditioner anti-freezing, comprising: Obtaining the temperature of the evaporator of the air conditioner and recording it as the 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 has a freezing risk; If it is less than or equal to, obtain the temperature at the target position in the room where the air conditioner is located, and record it as the second current temperature T2; Determine whether the second current temperature T2 is greater than the second preset temperature Ts2 to determine whether the temperature in the room is evenly distributed; If it is greater than, adjusting one of the position of the transverse air guide plate of the air conditioner and the speed of the fan according to a first preset rule; If one of the items reaches a limit value, adjusting the other of the position of the transverse air guide plate and the rotation speed of the fan according to a second preset rule; If the other item reaches a limit value, the air conditioner is controlled to start an anti-freeze protection mode.

2. The control method according to claim 1, wherein: The position where the air conditioner is located and the target position are on opposite sides of the room.

3. The control method according to claim 1, wherein: There are multiple target locations; 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 includes: Obtaining the temperature at each of the target locations in the room where the air conditioner is located; The average value of all temperatures is recorded as the second current temperature T2, or the maximum temperature of all temperatures is recorded as the second current temperature T2.

4. The control method according to claim 1, wherein: The step of adjusting one of the position of the transverse air guide plate and the speed of the fan of the air conditioner according to the first preset rule comprises: gradually increasing the blowing position of the transverse air guide plate of the air conditioner; After each adjustment of the first preset time length t1, the first current temperature T1 is obtained again; If the first current temperature T1 is greater than the first preset temperature Ts1, controlling the transverse air guide plate to maintain a current position; If the first current temperature T1 is less than or equal to the first preset temperature Ts1, the blowing position of the transverse air guide plate of the air conditioner continues to be adjusted upward until the transverse air guide plate is adjusted upward to a limit value.

5. The control method according to claim 4, wherein: If one of the items reaches a limit value, the step of adjusting the other of the position of the transverse air guide plate and the speed of the fan according to a second preset rule comprises: If the transverse air guide plate 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 speed of the fan of the air conditioner is gradually increased; After each adjustment of the second preset time length t2, the first current temperature T1 is obtained again; If the first current temperature T1 is greater than the first preset temperature Ts1, controlling the fan to maintain the current speed; If the first current temperature T1 is less than or equal to the first preset temperature Ts1, the speed of the fan continues to be increased until the speed of the fan is increased to a limit value.

6. The control method according to claim 1, wherein: The step of controlling the air conditioner to start the anti-freeze protection mode includes: gradually increasing the opening of the expansion valve of the air conditioner; After each adjustment of the third preset time length t3, the first current temperature T1 is obtained; If the first current temperature T1 is greater than the first preset temperature Ts1, controlling the expansion valve to maintain a current opening; If the opening of the expansion valve is increased to the 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 it stops.

7. The control method according to claim 1, further comprising: Obtaining the number of times the air conditioner turns on the anti-freeze protection mode within a preset time period, and the second preset temperature Ts2 corresponding to each time; Determine 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, the air conditioner is controlled to send a reminder message to remind the user to clean the filter 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 includes: Acquire an infrared image, and identify at least two temperature pickup sheets from the infrared image, wherein the temperature pickup sheets are attached to the wall; Determine a temperature pickup piece with the highest temperature, and determine the corresponding temperature as the second current temperature T2; The step of determining whether the second current temperature T2 is greater than the second preset temperature Ts2 includes: Determine a temperature pickup piece with the lowest temperature, and record the corresponding temperature as the third current temperature T3; 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.

9. An air conditioner, comprising: A first temperature detection device, used to detect 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, connected to the first temperature detection device and the second temperature detection device for communication; A memory storing program instructions, wherein the program instructions are configured to enable the air conditioner to execute 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 removed from the air conditioner; The second temperature detection device is wirelessly connected to the controller.

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