Air conditioner defrosting control method, device and system and air conditioner

Abstract

The invention discloses an air conditioner defrosting control method, device and system and an air conditioner, and belongs to the field of air conditioner defrosting. The air conditioner defrosting control method comprises the steps that when an air conditioner enters a defrosting mode, an electric heater is controlled to be started, and the indoor air outlet temperature is obtained; a target control strategy of the rotating speed of the indoor fan is determined based on the interval where the indoor air outlet temperature is located; and controlling the rotating speed of the indoor fan based on the target control strategy. According to the scheme, the rotating speed of the indoor fan can be controlled according to the indoor air outlet temperature, a humidity sensor is not needed to collect humidity data and calculate the dew point temperature, the cost of the air conditioner is greatly reduced, and the electric heater is always started when the air conditioner defrosts. While defrosting is not affected, it is guaranteed that indoor air outlet meets the use requirement, the situation that the indoor comfort is reduced in the defrosting process is avoided, and the use experience of a user is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioner defrosting, and in particular, to an air conditioner defrosting control method, device, system and air conditioner. Background Art

[0002] An existing control method for improving heating comfort during air conditioner defrosting delays the shutdown of the indoor fan and electric auxiliary heating device after the air conditioner enters defrost operation, thereby increasing the heating air output time. The main control method includes: obtaining the heat exchanger pipe temperature T_in and the indoor ambient temperature T_ao in real time from the time the air conditioner enters the defrost operation mode; obtaining the indoor dew point temperature T_d based on the indoor ambient temperature T_ao or humidity; and controlling the operation mode of the indoor fan and electric auxiliary heating device based on the relationship between the pipe temperature T_in, the ambient temperature T_ao, and the dew point temperature T_d.

[0003] When the air temperature reaches the dew point temperature T_d, water in the air will be separated to form condensation, which may occur on the surface of the heat exchanger. To prevent condensation from forming on the heat exchanger and being blown to electrical components such as the motor by the fan, the indoor fan and electric auxiliary heating device are only turned on for a period of time.

[0004] Therefore, the existing control scheme not only requires a humidity sensor to calculate the dew point temperature, but also the indoor fan and electric auxiliary heating device are only turned on for a period of time, resulting in poor indoor comfort during defrosting. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the present application provides an air conditioner defrost control method, device, system and air conditioner to solve the problem that the existing air conditioner defrost control scheme requires a humidity sensor, which is costly and may cause cold air to blow indoors during the defrost time, resulting in poor comfort.

[0006] The technical solution adopted by this application to solve its technical problems is:

[0007] In a first aspect, a defrost control method for an air conditioner is provided, comprising:

[0008] When the air conditioner enters the defrost mode, the electric heater is controlled to turn on and the indoor air outlet temperature is obtained;

[0009] Determining a target control strategy for the rotation speed of the indoor fan based on the range of the indoor air outlet temperature;

[0010] The rotational speed of the indoor fan is controlled based on the target control strategy.

[0011] As an optional implementation of the present application, the target control strategy for determining the rotation speed of the indoor fan based on the range of the indoor air outlet temperature includes:

[0012] When the indoor air outlet temperature is less than or equal to the first preset air outlet temperature, obtaining the indoor ambient temperature;

[0013] Calculating the temperature difference between the indoor air outlet temperature and the indoor ambient temperature;

[0014] A target control strategy for the rotational speed of the indoor fan is determined according to the temperature difference.

[0015] As an optional implementation of the present application, the target control strategy for determining the rotational speed of the indoor fan according to the temperature difference includes:

[0016] When the temperature difference is greater than a first preset temperature difference, the target control strategy for determining the rotational speed of the indoor fan is to reduce the rotational speed of the indoor fan.

[0017] As an optional implementation of this application, the following is also included:

[0018] The reducing the rotation speed of the indoor fan includes:

[0019] determining a reduction amount of the rotational speed of the indoor fan according to the temperature difference, wherein the greater the temperature difference, the smaller the reduction amount of the rotational speed of the indoor fan;

[0020] The rotation speed of the indoor fan is reduced based on the amount of reduction in the rotation speed of the indoor fan.

[0021] As an optional implementation of this application, the following is also included:

[0022] When the temperature difference is less than or equal to a first preset temperature difference, it is determined that the electric heater is faulty, and the electric heater and the indoor fan are controlled to stop working, and fault information is sent at the same time.

[0023] As an optional implementation of the present application, the target control strategy for determining the rotation speed of the indoor fan based on the range of the indoor air outlet temperature includes:

[0024] When the indoor air outlet temperature is greater than the first preset air outlet temperature and less than or equal to the second preset air outlet temperature, the target control strategy for determining the rotation speed of the indoor fan is to maintain the rotation speed of the indoor fan unchanged.

[0025] As an optional implementation of the present application, the target control strategy for determining the rotation speed of the indoor fan based on the range of the indoor air outlet temperature includes:

[0026] When the indoor air outlet temperature is greater than a second preset air outlet temperature, the target control strategy for determining the rotation speed of the indoor fan is to increase the rotation speed of the indoor fan.

[0027] In a second aspect, a defrost control device for an air conditioner is provided, comprising:

[0028] The indoor air outlet temperature acquisition module is used to control the electric heater to turn on and obtain the indoor air outlet temperature when the air conditioner enters the defrost mode;

[0029] a target control strategy determination module, configured to determine a target control strategy for the rotation speed of the indoor fan based on the interval of the indoor air outlet temperature;

[0030] The indoor fan speed control module is used to control the speed of the indoor fan based on the target control strategy.

[0031] In a third aspect, an air conditioner defrost control system is provided, comprising:

[0032] at least one processor and at least one memory;

[0033] The memory stores executable instructions of the processor;

[0034] The processor is configured to execute any one of the above air conditioner defrost control methods.

[0035] In a fourth aspect, an air conditioner is provided, applying any of the above-mentioned air conditioner defrost control methods.

[0036] Beneficial effects:

[0037] The technical solution of the present application provides an air conditioner defrost control method, device, system and air conditioner. Among them, the air conditioner defrost control method includes: when the air conditioner enters the defrost mode, controlling the electric heater to turn on and obtaining the indoor air outlet temperature; determining the target control strategy of the speed of the indoor fan based on the range of the indoor air outlet temperature; and controlling the speed of the indoor fan based on the target control strategy. The present application solution can control the speed of the indoor fan according to the indoor air outlet temperature, and does not require a humidity sensor to collect humidity data and calculate the dew point temperature, which greatly reduces the cost of the air conditioner and keeps the electric heater on when the air conditioner is defrosting. While not affecting the defrost, it ensures that the indoor air outlet meets the use requirements, avoids the reduction of indoor comfort during the defrost process, and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0039] Figure 1This is a flow chart of an air conditioner defrost control method provided by an embodiment of the present application;

[0040] Figure 2 Schematic diagram of a target control strategy for determining the rotation speed of an indoor fan based on the range of the indoor air outlet temperature provided by an embodiment of the present application;

[0041] Figure 3 This is a working circuit diagram of an air conditioner provided in an embodiment of the present application;

[0042] Figure 4 This is a flow chart of a specific air conditioner defrost control method provided by an embodiment of the present application;

[0043] Figure 5 This is a structural diagram of an air conditioner defrost control device provided in an embodiment of the present application;

[0044] Figure 6 This is a structural diagram of an air conditioner defrost control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application are described in detail below with reference to the accompanying drawings and examples. Obviously, the described embodiments are only some of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other implementation methods obtained by ordinary technicians in this field without making any creative work are within the scope of protection of this application.

[0046] The problems existing in the existing air conditioner defrost control method are as follows:

[0047] 1. The control mode requires real-time acquisition of the indoor dew point temperature T_d, which requires complex calculations and requires detection of indoor air humidity. To obtain air humidity data, a humidity sensor is required. Humidity sensors are expensive and have large errors, significantly increasing the cost and implementation difficulty of the control solution.

[0048] 2. The electric heating time during defrosting is actually very short, and it occupies a relatively short time in the entire defrosting cycle. Therefore, it has limited effect on improving the comfort caused by the stopping of heating during defrosting.

[0049] The control mode is as follows: if T_d < T_in ≤ T_ao, the indoor fan is controlled to enter low-speed operation mode (if currently in low-speed operation mode, the current state is maintained), and the electric auxiliary heating device is controlled to enter low-heat mode. In a typical air conditioner, when defrosting and entering cooling mode, the pipe temperature can drop below the dew point in about one minute, while the defrosting time for heating is generally around 5 to 10 minutes. This means that most of the defrosting time is spent in a state where indoor heating is stopped.

[0050] 3. The air outlet temperature is not controlled during defrost. According to the existing control mode, cold air may be blown, resulting in poor user comfort. The electric auxiliary heating system stops operating under the following conditions: If T_in ≤ T_d, indicating that the indoor heat exchanger pipe temperature has fallen below the dew point, the indoor fan is stopped and the electric auxiliary heating device is turned off. In practice, insufficient electric auxiliary heating power will result in excessively low air outlet temperature, blowing cold air indoors. Especially when the electric heating output is lower than the cooling capacity of the indoor cooling operation, the indoor side will actually be cooling, seriously affecting user comfort.

[0051] 4. During defrosting, the indoor fan runs at a constant low wind speed. Under low outdoor temperature conditions, the indoor cooling capacity is large, which may cause cold air to blow.

[0052] To solve the above problems, refer to Figure 1 , the embodiment of the present application provides an air conditioner defrost control method, comprising:

[0053] S11: When the air conditioner enters the defrost mode, the electric heater is controlled to turn on and the indoor air outlet temperature is obtained;

[0054] It should be noted that the electric heater is an internal component of the air conditioner. Heating is generally divided into two types: heat pump heating and electric heating. Heat pump heating uses a compressor for heating; electric heating uses only electric heating, without the compressor. The electric heater is not activated during normal heat pump heating and only comes on when electric heating is activated or during defrosting.

[0055] When the outdoor condenser tube temperature is detected to be lower than the preset defrost entry temperature, the air conditioner enters defrost mode. The four-way valve then switches to cooling mode, the electric heater turns on, and the indoor fan speed runs at the lowest setting. The lowest setting is the lowest gear of the indoor fan. For example, on a fan with three settings (high, medium, and low), the lowest setting is low. However, the lowest setting does not necessarily indicate the lowest speed.

[0056] It should be emphasized that the electric heater is always on during the entire defrost process, and is not stopped until the defrost mode is exited or a heater failure is detected.

[0057] Among them, the indoor air outlet temperature is obtained by the air outlet temperature sensor installed at the air outlet of the air conditioner.

[0058] In one embodiment, the outlet air temperature sensor obtains the indoor outlet air temperature in real time.

[0059] Therefore, in another embodiment, the outlet air temperature sensor acquires the indoor outlet air temperature after the electric heater has been turned on for a preset duration. Because the outlet air temperature is unstable and fluctuates greatly when the electric heater is not turned on, or immediately after it is turned on, control is unstable. Therefore, the indoor outlet air temperature is acquired after the electric heater has been on for a preset duration, at which point the outlet air temperature stabilizes. Of course, when acquiring the indoor outlet air temperature in real time, the indoor outlet air temperature after the electric heater has been on for a preset duration can also be used for control.

[0060] S12: Determining a target control strategy for the rotation speed of the indoor fan based on the range of the indoor air outlet temperature;

[0061] like Figure 2 As shown, the target control strategy for determining the speed of the indoor fan based on the range of the indoor air outlet temperature includes:

[0062] When the indoor air outlet temperature is less than or equal to the first preset air outlet temperature, obtaining the indoor ambient temperature;

[0063] Calculating the temperature difference between the indoor air outlet temperature and the indoor ambient temperature;

[0064] A target control strategy for the speed of the indoor fan is determined based on the temperature difference. When the indoor outlet air temperature is less than or equal to the first preset outlet air temperature, it indicates that the heating capacity of the electric heater and the cooling capacity of the indoor evaporator are relatively close, and it is necessary to further determine the target control strategy for the speed of the indoor fan based on the indoor ambient temperature.

[0065] The target control strategy for determining the rotation speed of the indoor fan according to the temperature difference includes:

[0066] When the temperature difference is greater than a first preset temperature difference, the target control strategy for determining the indoor fan speed is to reduce the indoor fan speed. When the temperature difference is greater than the first preset temperature difference, this indicates that the heating capacity of the electric heater exceeds the cooling capacity of the indoor evaporator, but only to a limited extent. Therefore, it is necessary to reduce the indoor fan speed to reduce the heat exchange efficiency of the indoor evaporator and, at the same time, lower the air velocity from the air conditioner outlet.

[0067] As a preferred implementation of the embodiment of the present application, reducing the rotation speed of the indoor fan includes:

[0068] determining a reduction amount of the rotational speed of the indoor fan according to the temperature difference, wherein the greater the temperature difference, the smaller the reduction amount of the rotational speed of the indoor fan;

[0069] The rotation speed of the indoor fan is reduced based on the amount of reduction in the rotation speed of the indoor fan.

[0070] It is understandable that the smaller the temperature difference, the lower the indoor air outlet temperature, which fails to meet user needs, and therefore the more the speed needs to be reduced.

[0071] In one embodiment, when the temperature difference is greater than a first preset temperature difference and less than or equal to a second preset temperature difference, reducing the speed of the indoor fan comprises: reducing a first compensation speed based on the speed of the lowest wind speed;

[0072] When the temperature difference is greater than the second preset temperature difference, reducing the rotation speed of the indoor fan comprises: reducing the rotation speed by a second compensation speed based on the rotation speed of the lowest wind speed;

[0073] Wherein, the second compensation speed is less than or equal to the first compensation speed.

[0074] In another embodiment, a functional relationship between the temperature difference and the reduction amount is obtained by fitting through experiments, etc., and the reduction amount is obtained based on the functional relationship.

[0075] Optionally, in some embodiments, when the temperature difference is greater than a first preset temperature difference, the fixed rotation speed is reduced regardless of the temperature difference.

[0076] When the temperature difference is less than or equal to a first preset temperature difference, the electric heater is determined to be faulty, and the electric heater and the indoor fan are controlled to stop operating, and a fault message is simultaneously transmitted. When the temperature difference is less than or equal to the first preset temperature difference, it indicates that the heating capacity of the electric heater is substantially zero, and thus the electric heater is determined to be faulty. In this case, the electric heater and the indoor fan are controlled to stop operating, and a fault message is transmitted to alert the user.

[0077] When the indoor outlet air temperature is greater than a first preset outlet air temperature and less than or equal to a second preset outlet air temperature, the target control strategy for determining the speed of the indoor fan is to maintain the speed of the indoor fan constant. When the indoor outlet air temperature is greater than the first preset outlet air temperature and less than or equal to the second preset outlet air temperature, the indoor outlet air temperature is appropriate, and therefore no additional control is required.

[0078] When the indoor outlet air temperature is greater than a second preset outlet air temperature, the target control strategy for determining the speed of the indoor fan is to increase the speed of the indoor fan. When the indoor outlet air temperature is greater than the second preset outlet air temperature, the electric heater generates a large amount of heat, resulting in a higher indoor outlet air temperature. Therefore, the speed of the indoor fan can be increased to accelerate the increase in the indoor ambient temperature.

[0079] As a preferred implementation of the embodiment of the present application, increasing the speed of the indoor fan includes:

[0080] The higher the indoor air outlet temperature, the greater the increase in the rotation speed of the indoor fan.

[0081] It should be noted that, during actual control, when the indoor outlet air temperature is greater than the second preset outlet air temperature, the indoor fan speed may be maintained constant. Specifically, when the indoor outlet air temperature is less than or equal to the first preset outlet air temperature, the target control strategy for the indoor fan speed is determined based on the temperature difference. When the indoor outlet air temperature is greater than the first preset outlet air temperature, the target control strategy for determining the indoor fan speed is to maintain the indoor fan speed constant.

[0082] Alternatively, when the indoor outlet air temperature is less than or equal to a first preset outlet air temperature, a target control strategy for the speed of the indoor fan is determined based on the temperature difference. When the indoor outlet air temperature is greater than the first preset outlet air temperature, a target control strategy for the speed of the indoor fan is determined to be increasing the speed of the indoor fan.

[0083] S13: Controlling the rotation speed of the indoor fan based on the target control strategy.

[0084] In addition, when it is detected that the outdoor condenser tube temperature is greater than or equal to the preset exit frosting temperature, the defrost mode is exited, the electric heater is controlled to stop working, the air-conditioning system resumes heating operation, and the indoor speed is turned to a low wind speed to prevent cold wind operation.

[0085] The air conditioner defrost control method provided by the present application scheme controls the electric heating device to turn on when the air conditioner enters the defrost mode, and obtains the indoor air outlet temperature; determines the target control strategy for the speed of the indoor fan based on the range of the indoor air outlet temperature; and controls the speed of the indoor fan based on the target control strategy. The present application scheme can control the speed of the indoor fan according to the indoor air outlet temperature, and does not require a humidity sensor to calculate the dew point temperature, which greatly reduces the cost of the air conditioner and keeps the electric heater on during the defrost of the air conditioner. While not affecting the defrost, it ensures that the indoor air outlet meets the user's needs, avoids the reduction of indoor comfort during the defrost process, and improves the user experience.

[0086] In order to more clearly illustrate the present application solution, a specific air conditioner defrost control method is provided below.

[0087] First, the working circuit diagram of the air conditioner is as follows Figure 3 As shown, the air conditioner includes an indoor motor (i.e., a motor for driving an indoor fan), an outdoor motor (i.e., a motor for driving an outdoor fan), an electric heater, a compressor, a control board AP1, and a control board AP2. The control board AP2 includes temperature sensors for realizing the control function. The temperature sensors include an outdoor pipe temperature sensing package, an air outlet temperature sensing package, an indoor pipe temperature sensing package, and an indoor ambient temperature sensing package.

[0088] The main control method is to start the electric heater during the defrosting stage of heat pump heating, determine the initial motor speed by detecting the temperature of the outlet air temperature sensor, then calculate the difference between the outlet air temperature and the indoor ambient temperature, determine the speed compensation value based on the temperature difference between the inlet and outlet air, and keep the indoor outlet air temperature at a relatively high level by reducing the indoor motor speed, thereby improving the comfort of the user's body feeling.

[0089] The specific method is as Figure 4 shown, and it includes the following steps:

[0090] After the air conditioner enters the heat pump heating mode, the electric heater stops working. When it is detected that the temperature of the outdoor condenser tube T_tube < T_in (defrosting entry temperature), when entering the defrosting mode, the four-way valve changes its direction at this time, and the air conditioning system starts to operate in the refrigeration mode, and the indoor speed is changed to the low wind gear operation. After that, the electric heater resumes working.

[0091] When the electric heater works continuously for 20 seconds, detect the temperature TD of the indoor outlet air temperature sensor,

[0092] 1. When TD ≤ 35°C, calculate the temperature difference T2 between the inlet and outlet air at the same time, T2 = TD - TH, where TH is the indoor ambient temperature, and adjust the motor speed according to the difference of the temperature difference T2 between the inlet and outlet air:

[0093] 1) When T2 ≤ 2°C, it is judged that there is a fault in the electric heater, enter the fault mode, and then the electric heater and the indoor motor stop working, and the digital indicator shows the fault code;

[0094] 2) When 2 < T2 ≤ 20°C, reduce the indoor motor speed. At this time, the indoor motor speed adjustment = low wind gear speed - compensation speed 1; compensation speed 1 is one of the values for reducing the fan speed, generally 10% - 50% of the rated speed, which is used to reduce the speed when the temperature difference between the inlet and outlet air is small to increase the outlet air temperature;

[0095] 3) When T2 > 20°C, maintain the indoor low wind gear operation at this time, reduce the indoor motor speed. At this time, the indoor motor speed adjustment = low wind gear speed - compensation speed 2; compensation speed 2 is one of the values for reducing the fan speed, generally 10% - 50% of the rated speed, which is used to reduce the speed when the temperature difference between the inlet and outlet air is small to increase the outlet air temperature;

[0096] Among them, compensation speed 2 is less than or equal to compensation speed.

[0097] 2. When 35 < TD ≤ 45°C, maintain the indoor low wind gear operation at this time;

[0098] 3. When TD > 45°C, increase the indoor motor speed, and the indoor motor speed adjustment = low wind gear speed + compensation speed 3.

[0099] When the outdoor condenser tube temperature TG ≥ T_out is detected, the defrost mode is exited and the electric heater stops working. The air conditioning system then resumes heating operation and switches the indoor speed to low to prevent cold air. T_out is the defrost exit temperature.

[0100] The specific air conditioner defrost control method provided in this embodiment is that after the air conditioner enters the heat pump heating mode, when it detects that the outdoor condenser tube temperature is less than T_in (defrost entry temperature), it enters the defrost mode, and the air conditioning system starts cooling operation at this time. In order to speed up the defrost speed and avoid the reduction in comfort caused by the indoor unit stopping heating, the electric heater is put into operation at this time, and the speed of the indoor fan is reduced to a specific ultra-low wind speed, so that the heating capacity of the indoor electric heating wire is greater than the cooling capacity of the indoor evaporator, so that the overall heating output state is provided to the indoor side. By detecting the temperature of the outlet air temperature sensor, the initial speed of the motor is determined; then the difference between the outlet air temperature and the indoor ambient temperature is calculated, and the speed compensation value is determined according to the inlet and outlet air temperature difference. By reducing the indoor motor speed, the indoor outlet air temperature is maintained at a high level, avoiding the blowing of cold air indoors and improving the user's comfort.

[0101] Based on the same inventive concept, Figure 5 As shown, the present application also provides an air conditioner defrost control device 50, comprising:

[0102] The indoor air outlet temperature acquisition module 51 is used to control the electric heater to turn on and obtain the indoor air outlet temperature when the air conditioner enters the defrost mode;

[0103] It should be noted that the electric heater is an internal component of the air conditioner. When the air conditioner is in normal heat pump heating mode, the electric heater is not turned on. It is only turned on when the electric heating is started or when defrosting.

[0104] When the outdoor condenser tube temperature is detected to be lower than the preset defrost entry temperature, the air conditioner enters defrost mode. The four-way valve then switches to cooling mode, the electric heater turns on, and the indoor fan speed runs at the lowest setting. The lowest setting is the lowest gear of the indoor fan. For example, on a fan with three settings (high, medium, and low), the lowest setting is low. However, the lowest setting does not necessarily indicate the lowest speed.

[0105] It should be emphasized that the electric heater is always on during the entire defrost process, and is not stopped until the defrost mode is exited or a heater failure is detected.

[0106] Among them, the indoor air outlet temperature is obtained by the air outlet temperature sensor installed at the air outlet of the air conditioner.

[0107] In one embodiment, the outlet air temperature sensor obtains the indoor outlet air temperature in real time.

[0108] Therefore, in another embodiment, the outlet air temperature sensor acquires the indoor outlet air temperature after the electric heater has been turned on for a preset duration. Because the outlet air temperature is unstable and fluctuates greatly when the electric heater is not turned on, or immediately after it is turned on, control is unstable. Therefore, the indoor outlet air temperature is acquired after the electric heater has been on for a preset duration, at which point the outlet air temperature stabilizes. Of course, when acquiring the indoor outlet air temperature in real time, the indoor outlet air temperature after the electric heater has been on for a preset duration can also be used for control.

[0109] A target control strategy determination module 52 is configured to determine a target control strategy for the speed of the indoor fan based on the range of the indoor air outlet temperature;

[0110] like Figure 2 As shown, the target control strategy for determining the speed of the indoor fan based on the range of the indoor air outlet temperature includes:

[0111] When the indoor air outlet temperature is less than or equal to the first preset air outlet temperature, obtaining the indoor ambient temperature;

[0112] Calculating the temperature difference between the indoor air outlet temperature and the indoor ambient temperature;

[0113] A target control strategy for the speed of the indoor fan is determined based on the temperature difference. When the indoor outlet air temperature is less than or equal to the first preset outlet air temperature, it indicates that the heating capacity of the electric heater and the cooling capacity of the indoor evaporator are relatively close, and it is necessary to further determine the target control strategy for the speed of the indoor fan based on the indoor ambient temperature.

[0114] The target control strategy for determining the rotation speed of the indoor fan according to the temperature difference includes:

[0115] When the temperature difference is greater than a first preset temperature difference, the target control strategy for determining the indoor fan speed is to reduce the indoor fan speed. When the temperature difference is greater than the first preset temperature difference, this indicates that the heating capacity of the electric heater exceeds the cooling capacity of the indoor evaporator, but only to a limited extent. Therefore, it is necessary to reduce the indoor fan speed to reduce the heat exchange efficiency of the indoor evaporator and, at the same time, lower the air velocity from the air conditioner outlet.

[0116] As a preferred implementation of the embodiment of the present application, reducing the rotation speed of the indoor fan includes:

[0117] determining a reduction amount of the rotational speed of the indoor fan according to the temperature difference, wherein the greater the temperature difference, the smaller the reduction amount of the rotational speed of the indoor fan;

[0118] The rotation speed of the indoor fan is reduced based on the amount of reduction in the rotation speed of the indoor fan.

[0119] It is understandable that the smaller the temperature difference, the lower the indoor air outlet temperature, which fails to meet user needs, and therefore the more the speed needs to be reduced.

[0120] In one embodiment, when the temperature difference is greater than a first preset temperature difference and less than or equal to a second preset temperature difference, reducing the speed of the indoor fan comprises: reducing a first compensation speed based on the speed of the lowest wind speed;

[0121] When the temperature difference is greater than the second preset temperature difference, reducing the rotation speed of the indoor fan comprises: reducing the rotation speed by a second compensation speed based on the rotation speed of the lowest wind speed;

[0122] Wherein, the second compensation speed is less than or equal to the first compensation speed.

[0123] In another embodiment, a functional relationship between the temperature difference and the reduction amount is obtained by fitting through experiments, etc., and the reduction amount is obtained based on the functional relationship.

[0124] Optionally, in some embodiments, when the temperature difference is greater than a first preset temperature difference, the fixed rotation speed is reduced regardless of the temperature difference.

[0125] Of course, in actual use, when the temperature difference is greater than the first preset temperature difference, the fixed rotation speed is reduced regardless of the temperature difference.

[0126] When the temperature difference is less than or equal to a first preset temperature difference, the electric heater is determined to be faulty, and the electric heater and the indoor fan are controlled to stop operating, and a fault message is simultaneously transmitted. When the temperature difference is less than or equal to the first preset temperature difference, it indicates that the heating capacity of the electric heater is substantially zero, and thus the electric heater is determined to be faulty. In this case, the electric heater and the indoor fan are controlled to stop operating, and a fault message is transmitted to alert the user.

[0127] When the indoor outlet air temperature is greater than a first preset outlet air temperature and less than or equal to a second preset outlet air temperature, the target control strategy for determining the speed of the indoor fan is to maintain the speed of the indoor fan constant. When the indoor outlet air temperature is greater than the first preset outlet air temperature and less than or equal to the second preset outlet air temperature, the indoor outlet air temperature is appropriate, and therefore no additional control is required.

[0128] When the indoor outlet air temperature is greater than a second preset outlet air temperature, the target control strategy for determining the speed of the indoor fan is to increase the speed of the indoor fan. When the indoor outlet air temperature is greater than the second preset outlet air temperature, the electric heater generates a large amount of heat, resulting in a higher indoor outlet air temperature. Therefore, the speed of the indoor fan can be increased to accelerate the increase in the indoor ambient temperature.

[0129] As a preferred implementation of the embodiment of the present application, increasing the speed of the indoor fan includes:

[0130] The higher the indoor air outlet temperature, the greater the increase in the rotation speed of the indoor fan.

[0131] It should be noted that, during actual control, when the indoor outlet air temperature is greater than the second preset outlet air temperature, the indoor fan speed may be maintained constant. Specifically, when the indoor outlet air temperature is less than or equal to the first preset outlet air temperature, the target control strategy for the indoor fan speed is determined based on the temperature difference. When the indoor outlet air temperature is greater than the first preset outlet air temperature, the target control strategy for determining the indoor fan speed is to maintain the indoor fan speed constant.

[0132] Alternatively, when the indoor outlet air temperature is less than or equal to a first preset outlet air temperature, a target control strategy for the speed of the indoor fan is determined based on the temperature difference. When the indoor outlet air temperature is greater than the first preset outlet air temperature, a target control strategy for the speed of the indoor fan is determined to be increasing the speed of the indoor fan.

[0133] The indoor fan speed control module 53 is configured to control the speed of the indoor fan based on the target control strategy.

[0134] In addition, when it is detected that the outdoor condenser tube temperature is greater than or equal to the preset exit frosting temperature, the defrost mode is exited, the electric heater is controlled to stop working, the air-conditioning system resumes heating operation, and the indoor speed is turned to a low wind speed to prevent cold wind operation.

[0135] The air conditioner defrost control device provided in the embodiment of the present application controls the electric heater to turn on and obtain the indoor air outlet temperature when the air conditioner enters the defrost mode; determines the target control strategy for the speed of the indoor fan based on the range of the indoor air outlet temperature; and controls the speed of the indoor fan based on the target control strategy. The present application solution can control the speed of the indoor fan according to the indoor air outlet temperature, and does not require a humidity sensor to collect humidity data and calculate the dew point temperature, which greatly reduces the cost of the air conditioner and keeps the electric heater on during the defrost of the air conditioner. While not affecting the defrost, it ensures that the indoor air outlet meets the user's needs, avoids the reduction of indoor comfort during the defrost process, and improves the user experience.

[0136] Based on the same inventive concept, Figure 6 As shown, the present application also provides an air conditioner defrost control system 60, comprising:

[0137] at least one processor 61 and at least one memory 62;

[0138] The memory stores executable instructions of the processor;

[0139] The processor is configured to execute the air conditioner defrost control method provided by the above embodiment.

[0140] The air conditioner defrost control system provided in the embodiment of the present application stores executable instructions of the processor in a memory. When the executable instructions are executed, the processor can control the electric heater to turn on when the air conditioner enters the defrost mode and obtain the indoor air outlet temperature; determine the target control strategy for the speed of the indoor fan based on the range of the indoor air outlet temperature; and control the speed of the indoor fan based on the target control strategy. The present application solution can control the speed of the indoor fan according to the indoor air outlet temperature. It does not require a humidity sensor to collect humidity data and calculate the dew point temperature, which greatly reduces the cost of the air conditioner and keeps the electric heater on when the air conditioner is defrosting. While not affecting the defrost, it ensures that the indoor air outlet meets the use requirements, avoids the reduction of indoor comfort during the defrost process, and improves the user experience.

[0141] Based on the same inventive concept, the present application provides an air conditioner, applying the air conditioner defrost control method provided in the above embodiment.

[0142] The air conditioner provided in the embodiment of the present application, by applying the air conditioner defrost control method provided in the above embodiment, can control the electric heater to turn on when the air conditioner enters the defrost mode and obtain the indoor air outlet temperature; determine the target control strategy for the rotation speed of the indoor fan based on the range of the indoor air outlet temperature; and control the rotation speed of the indoor fan based on the target control strategy. The present application solution can control the rotation speed of the indoor fan according to the indoor air outlet temperature, and does not require a humidity sensor to collect humidity data and calculate the dew point temperature, which greatly reduces the cost of the air conditioner and keeps the electric heater on when the air conditioner is defrosting. While not affecting the defrost, it ensures that the indoor air outlet meets the use requirements, avoids the reduction of indoor comfort during the defrost process, and improves the user experience.

[0143] It should be noted that, in the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0144] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

Claims

1. A defrost control method for an air conditioner, characterized in that: include: When the air conditioner enters the defrost mode, the electric heater is controlled to turn on and the indoor air outlet temperature is obtained; Determining a target control strategy for the rotation speed of the indoor fan based on the range of the indoor air outlet temperature; The rotational speed of the indoor fan is controlled based on the target control strategy.

2. The method according to claim 1, wherein: The target control strategy for determining the rotation speed of the indoor fan based on the range of the indoor air outlet temperature includes: When the indoor air outlet temperature is less than or equal to the first preset air outlet temperature, obtaining the indoor ambient temperature; Calculating the temperature difference between the indoor air outlet temperature and the indoor ambient temperature; A target control strategy for the rotational speed of the indoor fan is determined according to the temperature difference.

3. The method according to claim 2, wherein: The target control strategy for determining the rotational speed of the indoor fan according to the temperature difference includes: When the temperature difference is greater than a first preset temperature difference, the target control strategy for determining the rotational speed of the indoor fan is to reduce the rotational speed of the indoor fan.

4. The method according to claim 3, characterized in that The reducing the rotation speed of the indoor fan includes: determining a reduction amount of the rotational speed of the indoor fan according to the temperature difference, wherein the greater the temperature difference, the smaller the reduction amount of the rotational speed of the indoor fan; The rotation speed of the indoor fan is reduced based on the amount of reduction in the rotation speed of the indoor fan.

5. The method according to claim 2, characterized in that Also includes: When the temperature difference is less than or equal to a first preset temperature difference, it is determined that the electric heater is faulty, and the electric heater and the indoor fan are controlled to stop working, and fault information is sent at the same time.

6. The method according to claim 1, wherein: The target control strategy for determining the rotation speed of the indoor fan based on the range of the indoor air outlet temperature includes: When the indoor air outlet temperature is greater than the first preset air outlet temperature and less than or equal to the second preset air outlet temperature, the target control strategy for determining the rotation speed of the indoor fan is to maintain the rotation speed of the indoor fan unchanged.

7. The method according to claim 1, wherein: The target control strategy for determining the rotation speed of the indoor fan based on the range of the indoor air outlet temperature includes: When the indoor air outlet temperature is greater than a second preset air outlet temperature, the target control strategy for determining the rotation speed of the indoor fan is to increase the rotation speed of the indoor fan.

8. An air conditioner defrost control device, characterized in that: include: The indoor air outlet temperature acquisition module is used to control the electric heater to turn on and obtain the indoor air outlet temperature when the air conditioner enters the defrost mode; a target control strategy determination module, configured to determine a target control strategy for the rotation speed of the indoor fan based on the interval of the indoor air outlet temperature; The indoor fan speed control module is used to control the speed of the indoor fan based on the target control strategy.

9. An air conditioner defrost control system, characterized in that: include: at least one processor and at least one memory; The memory stores executable instructions of the processor; The processor is configured to execute the method according to any one of claims 1 to 7.

10. An air conditioner, characterized in that: The method according to any one of claims 1 to 7 is used.

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