Control method for an air conditioner and air conditioner

Abstract

The present application relates to a control method for an air conditioner and the air conditioner. When the air conditioner is in a dehumidification mode, the control method comprises: obtaining a dew point temperature T d of an indoor environment and a swing leaf temperature T b of an indoor unit of the air conditioner; comparing the swing leaf temperature T b and the dew point temperature T d ; and controlling at least one of the following parameters based on the comparison result: a running frequency of a compressor of the air conditioner, an opening degree of an electronic expansion valve of the air conditioner, a rotating speed of an indoor fan of the indoor unit, and an opening and closing of an electric heater of the indoor unit. By using the control method, the air conditioner can effectively avoid water dripping at the swing leaf during the dehumidification process, and improve the user experience.

Description

Technical Field

[0001] This invention relates to the field of refrigeration system technology, and more specifically to a control method for an air conditioner and an air conditioner. Background Technology

[0002] Air conditioners include various types such as split-type air conditioners, integrated air conditioners, and VRF (Variable Refrigerant Flow) air conditioners. Regardless of the type, all air conditioners include components such as a compressor for compressing gaseous refrigerant, a condenser for liquefying the gaseous refrigerant, an expansion device for expanding and reducing pressure, and an evaporator for evaporating the liquid refrigerant back into gaseous refrigerant. In split-type or VRF air conditioners, the indoor heat exchanger is usually located in a separate indoor unit, such as a wall-mounted unit, a floor-standing unit, or a built-in unit. Most existing air conditioners have both cooling and heating functions. In cooling mode, the indoor heat exchanger in the indoor unit acts as an evaporator, where the low-temperature, low-pressure liquid refrigerant evaporates and absorbs heat from the indoor air, thus lowering the indoor air temperature (i.e., cooling). In heating mode, the indoor heat exchanger acts as a condenser, where the high-temperature, high-pressure gaseous refrigerant condenses and transfers heat to the room, thus raising the indoor air temperature (i.e., heating).

[0003] To further regulate indoor humidity, existing air conditioners generally also have a dehumidification function. In dehumidification mode, the indoor heat exchanger still acts as an evaporator. Water vapor in the indoor air condenses upon contact with the evaporator surface, and the condensate is collected in a drip tray below the heat exchanger and discharged from the indoor unit along the drain pipe. During this process, the dry-bulb temperature of the indoor environment also decreases, causing water vapor in the indoor air to easily condense at the air outlet of the indoor unit, especially at the louvers. In addition, to ensure dehumidification efficiency, the indoor unit's fan speed is usually low, allowing condensate to accumulate on the louvers instead of being directly blown into the room, resulting in dripping water at the louvers.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] To address the technical problem of water dripping from the louvers of air conditioners during dehumidification in existing technologies, this invention provides a control method for air conditioners. When the air conditioner is in dehumidification mode, the control method includes: acquiring the dew point temperature T of the indoor environment. d and the oscillating blade temperature T of the indoor unit of the air conditioner b The temperature T of the oscillating blade b and the dew point temperature T dA comparison is made; based on the comparison results, at least some of the following parameters are controlled: the operating frequency of the air conditioner's compressor, the opening degree of the air conditioner's electronic expansion valve, the speed of the indoor unit's fan, and the on / off state of the indoor unit's electric heater.

[0006] In the control method for an air conditioner of the present invention, the dew point temperature T of the indoor environment is first obtained. d The temperature T of the indoor unit's swing blades b Next, set the blade temperature T. b and dew point temperature T d A comparison is made. Then, based on the comparison results, at least some of the following parameters are controlled: the operating frequency of the air conditioner's compressor, the opening degree of the air conditioner's electronic expansion valve, the speed of the indoor unit's fan, and the on / off state of the indoor unit's electric heater, to prevent water dripping from the indoor unit's louvers. This is achieved by controlling the louver temperature T... b and dew point temperature T d By comparison, the temperature T of the oscillating blades can be determined. b Timely intervention is necessary to prevent the blade temperature from reaching T. b Excessively low temperatures cause water vapor to accumulate at the oscillating vanes, effectively preventing dripping. Furthermore, by controlling at least some parameters such as the compressor's operating frequency, the opening of the electronic expansion valve, the indoor unit's fan speed, and the on / off state of the electric heater, the control methods can be diversified, resulting in better control performance. In particular, the introduction of the electric heater's on / off state allows for rapid and efficient control of the oscillating vane temperature T. b Adjustments can be made to improve control efficiency.

[0007] In the preferred embodiment of the above-described control method for an air conditioner, the step of obtaining the dew point temperature T of the indoor environment... d The steps include: obtaining the dry-bulb temperature T and relative humidity RH of the return air vent of the indoor unit; and obtaining the dew point temperature T based on the dry-bulb temperature T and the relative humidity RH by referring to an enthalpy-humidity chart. d With the above settings, the dew point temperature T can be accurately obtained. d .

[0008] In the preferred embodiment of the control method for the air conditioner described above, the dew point temperature T is preset. d The first difference △T1, the second difference △T2, and the third difference △T3, wherein △T1 < △T2 < △T3; when (the dew point temperature T d +△T1) < the blade temperature T b ≤(the dew point temperature T) d When +△T2), the coil temperature T of the indoor unit is obtained. p Determine whether the coil temperature is less than (the dew point temperature T).d -△T3); When the judgment result is yes, reduce the operating frequency of the compressor, reduce the opening of the electronic expansion valve, and reduce the speed of the indoor unit fan; when the judgment result is no, maintain the operating frequency of the compressor, maintain the opening of the electronic expansion valve, and maintain the speed of the indoor unit fan. Through the above settings, the blade temperature T can be controlled. b It is not yet below the dew point temperature T d In advance, the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the indoor unit fan are controlled to reduce the temperature T of the swing blades. b The rate of decrease should be controlled to avoid frequent use of electric heaters, which could affect the cooling and dehumidification effects.

[0009] In the preferred embodiment of the control method for the air conditioner described above, when the temperature T of the swing blades... b ≤(the dew point temperature T) d When +△T1), the coil temperature T is obtained. p The temperature T of the coil p Compare with a preset temperature range; based on the coil temperature T p Based on the comparison result with the preset temperature range, the speed of the indoor unit fan is controlled, and the on / off state of the electric heater is also controlled. When the blade temperature T... b ≤(dew point temperature T) d When +△T1), based on the coil temperature T p The indoor unit fan speed and the on / off state of the electric heater are controlled by comparing the results with the preset temperature range. This allows for control of the oscillating blade temperature T. b Make precise and quick adjustments to avoid water dripping at the blades.

[0010] In the preferred embodiment of the control method for the air conditioner described above, the dew point temperature T is preset. d The fourth difference △T4 and the fifth difference △T5, wherein △T3 < △T4 < △T5; the preset temperature range includes: a first preset temperature range, which is greater than or equal to (the dew point temperature T). d -△T4); The second preset temperature range is less than (the dew point temperature T). d -△T4) and greater than or equal to (the dew point temperature T) d -△T5); and the third preset temperature range, which is less than (the dew point temperature T). d -△T5). By setting three preset temperature ranges, the control logic can be refined and the control accuracy improved.

[0011] In the preferred embodiment of the control method for the air conditioner described above, when the coil temperature T pWhen the temperature falls within the first preset temperature range, the indoor unit fan is controlled to operate at a first preset wind speed; the current blade temperature T is obtained. b The current blade temperature T b With (the dew point temperature T) d -△T1) is compared; when the current blade temperature T b Less than or equal to (the dew point temperature T) d When -△T1), the electric heater is turned on at a preset level, and the indoor unit fan is operated at a second preset speed; after a preset time period, the blade temperature T is retrieved again. b The re-obtained blade temperature T b With (the dew point temperature T) d +△T2) is compared; when the re-obtained blade temperature T b Greater than (the dew point temperature T) d When the temperature reaches +△T2), the electric heater is turned off, and the indoor unit fan is controlled to operate at the first preset fan speed, wherein the first preset fan speed is greater than the second preset fan speed. When the coil temperature T p When the temperature falls within the first preset temperature range, it indicates that the coil temperature is relatively low and the blade temperature T is low. b It is possible that the temperature will continue to drop and fall below the dew point temperature T. d However, whether the electric heater needs to be turned on immediately depends on the blade temperature T. b Is it already below (dew point temperature T)? d -△T1), when the blade temperature T b Below (dew point temperature T) d Turning on the electric heater at -△T1) can quickly raise the temperature of the oscillating blades. b This avoids the electric heater from being used ineffectively. Additionally, when the electric heater is turned on, the indoor unit fan operates at a lower, second preset fan speed, which can effectively increase the oscillator temperature T. b On the basis of avoiding blowing hot air and affecting the user experience.

[0012] In the preferred embodiment of the control method for the air conditioner described above, when the coil temperature T p When the temperature falls within the second preset temperature range, the indoor unit fan is controlled to operate at the second preset wind speed, and the electric heater is controlled to turn on at a preset level; after the preset time period, the oscillating blade temperature T is re-acquired. b The re-obtained blade temperature T b With (the dew point temperature T) d +△T2) is compared; when the re-obtained blade temperature T b Greater than (the dew point temperature T) dWhen the temperature reaches +△T2), the electric heater is turned off, and the indoor unit fan is controlled to operate at the first preset fan speed. When the coil temperature T p When the temperature falls within the second preset temperature range, it indicates that the coil temperature T is currently within this range. p Lower, blade temperature T b It continues to drop and eventually falls below the dew point temperature T. d If the risk is greater, then directly turn on the electric heater and control the indoor unit fan to run at the second preset fan speed.

[0013] In the preferred embodiment of the control method for the air conditioner described above, when the coil temperature T p When the temperature falls within the third preset temperature range, the indoor unit fan is controlled to operate at the first preset wind speed, and the electric heater is controlled to turn on at a preset level; after the preset time period, the oscillating blade temperature T is re-acquired. b The re-obtained blade temperature T b With (the dew point temperature T) d +△T1) is compared; when the re-obtained blade temperature T b Greater than (the dew point temperature T) d When +△T1), control the indoor unit fan to operate at the second preset wind speed; after the preset time period, obtain the blade temperature T again. b The temperature T of the oscillating blade will be obtained again. b With (the dew point temperature T) d +△T2) is compared; when the blade temperature T is obtained again b Greater than (the dew point temperature T) d When the temperature reaches +△T2), the electric heater is turned off, and the indoor unit fan is controlled to operate at the first preset fan speed. When the coil temperature T p When the temperature falls within the third preset temperature range, it indicates that the coil temperature T is at this time. p It's already very low, the blade temperature T b Below the dew point temperature T d The risk is high, so the electric heater is turned on and the indoor unit fan is controlled to run at the first preset fan speed, which is relatively high, so as to quickly raise the blade temperature T. b .

[0014] In the preferred embodiment of the control method for the air conditioner described above, the electric heater is arranged between the indoor heat exchanger of the indoor unit and the swing blades of the indoor unit. The electric heater's arrangement between the indoor heat exchanger and the swing blades allows the swing blade temperature to rise rapidly without affecting dehumidification efficiency when the electric heater is activated.

[0015] To address the technical problem of water dripping from the louvers during dehumidification in existing air conditioners, this invention provides an air conditioner. The air conditioner executes the control method for air conditioners described in any of the preceding claims. By employing the control method for air conditioners described in any of the preceding claims, the air conditioner of this invention can effectively prevent water dripping from the louvers during dehumidification, thereby improving the user experience. Attached Figure Description

[0016] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0017] Figure 1 This is a system schematic diagram of an embodiment of the indoor unit of the air conditioner of the present invention;

[0018] Figure 2 This is a flowchart illustrating the control method of the present invention for an air conditioner;

[0019] Figure 3 This is a schematic flowchart of the first part of the first embodiment of the control method for an air conditioner of the present invention;

[0020] Figure 4 This is a schematic flowchart of the second part of the first embodiment of the control method for an air conditioner of the present invention.

[0021] Figure 5 This is a schematic flowchart of the second part of the second embodiment of the control method for an air conditioner of the present invention.

[0022] Figure label:

[0023] 1. Indoor unit; 10. Housing; 10a. Return air vent; 10b. Air outlet; 20. Filter screen; 30. Rotary blades; 40. Indoor heat exchanger; 50. Electric heater; 60. Indoor unit fan; 70a. First temperature sensor; 70b. Second temperature sensor; 70c. Third temperature sensor. Detailed Implementation

[0024] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0025] It should be noted that in the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "installation," "setting," and "connection" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] To address the technical problem of water dripping from the louvers of air conditioners during dehumidification in existing technologies, this invention provides a control method for air conditioners. When the air conditioner is in dehumidification mode, the control method includes: acquiring the dew point temperature T of the indoor environment. d The oscillating blade temperature T of the indoor unit 1 of the air conditioner b ; Set the blade temperature T b and dew point temperature T d A comparison is made; based on the comparison results, at least some of the following parameters are controlled: the operating frequency of the air conditioner's compressor, the opening degree of the air conditioner's electronic expansion valve, the speed of the indoor unit fan 60 of the indoor unit 1, and the opening and closing of the indoor unit 1's electric heater 50.

[0027] Figure 1 This is a system schematic diagram of an embodiment of the indoor unit of the air conditioner of the present invention. Figure 1As shown, the air conditioner of the present invention includes an indoor unit 1 that can be arranged inside the space to be conditioned (e.g., in a room). In one or more embodiments, the indoor unit 1 is a floor-standing unit. Alternatively, the indoor unit 1 can also be a wall-mounted indoor unit, an embedded indoor unit, or other suitable forms. In one or more embodiments, the indoor unit 1 has a generally rectangular housing 10. Alternatively, the indoor unit 1 can also be a cylinder or other suitable forms. An air outlet 10b is formed on the front of the housing 10 at the top, and return air inlets 10a are formed on the left and right sides of the housing 10 at the bottom. In one or more embodiments, a filter screen 20 is also provided at each return air inlet 10a to prevent dust, lint, and other impurities from entering the interior of the housing 10 with the airflow. A louver 30 is provided at the air outlet 10b to adjust the direction of the airflow. Inside the housing 10, there are components such as an indoor heat exchanger 40, an electric heater 50, and an indoor unit fan 60. The indoor heat exchanger 40 can be, but is not limited to, a finned coil heat exchanger. The electric heater 50 can take the form of, but is not limited to, an electric heating element, a PTC electric heater, etc. In one or more embodiments, the electric heater 50 is arranged between the indoor heat exchanger 40 and the oscillating vanes 30, so that when the electric heater 50 is turned on, the temperature of the oscillating vanes 30 can be rapidly increased without affecting the dehumidification efficiency. The indoor unit fan 60 can be a centrifugal fan, a cross-flow fan, or other suitable form. When the indoor unit fan 60 rotates, the indoor ambient airflow is drawn into the housing 10 through the return air vent 10a. The airflow flows sequentially through the indoor heat exchanger 40 and the electric heater 50, exchanging heat with the indoor heat exchanger 40 and the electric heater 50 respectively, and then is blown into the room from the air outlet 10b.

[0028] See also Figure 1 In one or more embodiments, a first temperature sensor 70a is provided near the return air vent 10a to detect the dry-bulb temperature T and relative humidity RH of the indoor environment. In one or more embodiments, a second temperature sensor 70b is provided near the return air vent 10b to detect the louver temperature T. b The second temperature sensor 70b can be directly mounted on the oscillating vane 30. In one or more embodiments, a third temperature sensor 70c is also provided on the indoor heat exchanger 40 to detect the coil temperature T. P The third temperature sensor 70c can be arranged in the middle of the indoor heat exchanger 40. It should be noted that the number of the first temperature sensor 70a, the second temperature sensor 70b, and the third temperature sensor 70c can be set multiple times according to actual needs, in order to more accurately measure the temperature and humidity at the corresponding locations. The types of the first temperature sensor 70a, the second temperature sensor 70b, and the third temperature sensor 70c are not limited; they can be resistance temperature detectors (RTDs), thermocouples, or other suitable sensors.

[0029] The air conditioner of this invention also includes an outdoor unit (not shown in the figure) that can be arranged outside the space to be conditioned. The outdoor unit is connected to the indoor unit 1 via pipes. The outdoor unit includes a generally rectangular shell. Inside the shell are components such as a compressor, an outdoor heat exchanger, an electronic expansion valve, and an outdoor unit fan. The compressor, outdoor heat exchanger, electronic expansion valve, and indoor heat exchanger 40 are connected sequentially via refrigerant pipes to form a refrigeration circuit in which a refrigerant (e.g., R34a) circulates. The compressor is a variable frequency compressor so that its operating frequency can be adjusted according to actual needs. The compressor can be, but is not limited to, a screw compressor, a reciprocating compressor, a scroll compressor, etc. The outdoor heat exchanger can be, but is not limited to, a finned coil heat exchanger, etc. The outdoor unit fan can be an axial flow fan or other suitable form. In one or more embodiments, a four-way valve for controlling the refrigerant flow direction is also provided in the refrigeration circuit so that the air conditioner can have both heating and cooling functions.

[0030] Below, in conjunction with Figures 2-4 This document details embodiments of the control method for air conditioners according to the present invention. It should be noted that the control method for air conditioners of the present invention can be implemented in any of the air conditioners described in the above embodiments, and can also be used in other suitable air conditioners.

[0031] Figure 2 This is a flowchart illustrating the control method for an air conditioner according to the present invention. Figure 2 As shown, in one or more embodiments, when the control method of the present invention for an air conditioner starts, step S1 is executed first, that is, when the air conditioner is in dehumidification mode, the dew point temperature T of the indoor environment is obtained. d The oscillating blade temperature T of the indoor unit 1 of the air conditioner b In one or more embodiments, the dew point temperature T of the indoor environment is obtained. d The steps include: obtaining the dry-bulb temperature T and relative humidity RH of the return air vent 10a of the indoor unit 1; and obtaining the dew point temperature T based on the dry-bulb temperature T and relative humidity RH by referring to an enthalpy-humidity chart. d The dew point temperature T is obtained by consulting an enthalpy-humidity chart. d It can increase the dew point temperature T d The accuracy is as follows. In one or more embodiments, the dry-bulb temperature T and relative humidity RH of the return air vent 10a can be measured by a first temperature sensor 70a arranged near the return air vent 10a. For example, when the dry-bulb temperature T of the return air vent is 26.7°C (i.e., degrees Celsius) and the relative humidity RH is 60%, the current dew point temperature T can be obtained by automatically checking the enthalpy-humidity chart by the controller in the air conditioner. d The dew point temperature T is 18.3℃. Alternatively, the control method of the present invention can also use other suitable methods to obtain the dew point temperature T of the indoor environment. d For example, the dew point temperature T can be approximately calculated using a formula.d The formula can be Td = T - (100 - RH * 100) / 5. For example, when the dry-bulb temperature T at the return air vent is 26.7℃ and the relative humidity RH is 60%, the current dew point temperature T is automatically calculated by the controller in the air conditioner. d The temperature is 18.7℃. The louver temperature T of indoor unit 1 is... b The temperature can be measured by a second temperature sensor 70b located on the air outlet 10b or the oscillating blade 30. Next, the control method executes step S2, which involves determining the oscillating blade temperature T. b With dew point temperature T d A comparison is made. Then, the control method executes step S3, which, based on the comparison result, controls at least some of the following parameters: the operating frequency of the air conditioner's compressor, the opening degree of the air conditioner's electronic expansion valve, the speed of the indoor unit fan 60 of the indoor unit 1, and the opening and closing of the indoor unit 1's electric heater 50, thereby ensuring that the swing blades 30 have a high temperature and preventing water vapor in the air from condensing and accumulating at the swing blades 30, resulting in dripping water.

[0032] Figure 3 This is a schematic flowchart of the first part of the first embodiment of the control method for an air conditioner according to the present invention. Figure 3 As shown, in one or more embodiments, after the control method of the present invention for an air conditioner starts, step S10 is executed first, that is, when the air conditioner is in dehumidification mode, the dew point temperature T of the indoor environment is obtained. d The oscillating blade temperature T of the indoor unit 1 of the air conditioner b Next, step S11 is executed, which involves determining the temperature T of the oscillating blades. b Is it greater than (dew point temperature T)? d +△T1) and less than or equal to (dew point temperature T) d +△T2). Where △T1 is the preset dew point temperature T. d The first difference, △T2, is the preset dew point temperature T. d The second difference, and △T1 is less than △T2. In one or more embodiments, △T1 is 0.3℃ and △T2 is 0.5℃. Alternatively, △T1 and △T2 can also be set to other suitable temperature values. When the judgment result is yes, it indicates that the blade temperature T is... b Although it has not yet fallen below the dew point temperature T d However, it is already close to the dew point temperature T. d Then proceed to step S12, which involves obtaining the coil temperature T of indoor unit 1. p Coil temperature T p The temperature can be measured by a third temperature sensor located on the indoor heat exchanger 40. Then, the control method proceeds to step S13, which involves determining the coil temperature T. p Is it less than (dew point temperature T)? d-△T3). Where △T3 is the preset dew point temperature T. d The third difference. In one or more embodiments, △T3 is 5°C. Alternatively, △T3 can also be set to other suitable temperature values. When the judgment result is yes, it indicates that the coil temperature T is at this time. p Lower, blade temperature T b There is a possibility that the temperature will continue to drop and eventually fall below the dew point temperature T. d If the risk is detected, the control method executes step S14, which involves reducing the compressor's operating frequency, decreasing the opening of the electronic expansion valve, and reducing the speed of the indoor unit fan 60, thereby appropriately increasing the coil temperature T. p This prevents premature condensation on the oscillating vane 30. It should be noted that the specific adjustment values ​​for the compressor's operating frequency, the opening degree of the electronic expansion valve, and the speed of the indoor unit fan 60 can be flexibly adjusted according to actual needs and component selection. The control method ends after step S14 is completed. After executing step S13, if the judgment result is negative, it indicates that the coil temperature T is currently... p The operating frequency of the compressor is relatively high, and the probability of condensation on the rotor blades 30 is relatively small. Therefore, the operating frequency of the compressor is maintained, the opening of the electronic expansion valve is maintained, and the speed of the indoor unit fan 60 is maintained (step S15). When step S15 is completed, the control method ends.

[0033] Figure 4 This is a schematic flowchart of the second part of the first embodiment of the control method for an air conditioner according to the present invention. Figure 4 As shown, after executing step S11, if the judgment result is negative, the control method proceeds to step S20, that is, continues to judge the blade temperature T. b Is it less than or equal to (dew point temperature T)? d +△T1). If the judgment result is negative, it means that the temperature T of the blade at this time is... b Greater than (dew point temperature T) d +△T2), blade temperature T b The temperature is relatively high, and the probability of condensation on the rotor blade 30 is very small. Therefore, the control method executes step S24, maintaining the compressor's operating frequency, the opening of the electronic expansion valve, and the speed of the indoor unit fan 60. The control method ends after step S24 is completed. When the judgment result is yes, it indicates that the rotor blade temperature T is currently... b If the temperature is low, the control method proceeds to step S21, which involves obtaining the coil temperature T. p Next, proceed to step S22 to set the coil temperature T. p Compare with a preset temperature range. Then, based on the coil temperature T... p Based on the comparison result with the preset temperature range, the speed of the indoor unit fan 60 is controlled, and the opening and closing of the electric heater 50 is controlled (i.e., step S23). When step S23 is completed, the control method ends.

[0034] Figure 5 This is a schematic flowchart of the second part of a second embodiment of the control method for an air conditioner according to the present invention. It should be noted that parts not mentioned in the second embodiment can be configured the same as in the first embodiment described above, and will not be repeated here. In one or more embodiments, the preset temperature range includes a first preset temperature range, a second preset temperature range, and a third preset temperature range. The first preset temperature range is greater than or equal to (dew point temperature T...). d -△T4); The second preset temperature range is less than (dew point temperature T). d -△T4) and greater than or equal to (dew point temperature T) d -△T5); The third preset temperature range is less than (dew point temperature T). d -△T5). △T4 is the preset dew point temperature T. d The fourth difference, △T5, is the preset dew point temperature T. d The fifth difference is ΔT3 < ΔT4 < ΔT5. In one or more embodiments, ΔT4 is 8°C and ΔT5 is 15°C. Alternatively, ΔT4 and ΔT5 can also be set to other suitable temperature values. Furthermore, the preset temperature range can also be set to more or fewer than three other suitable temperature ranges. By setting multiple preset temperature ranges, the control logic can be refined and the control accuracy improved.

[0035] like Figure 5 As shown, in one or more embodiments, after executing step S22, the control method proceeds to step S230, that is, determining the coil temperature T. p Does it fall within the first preset temperature range? If the result is yes, it means that the coil temperature T is currently within this range. p If the speed is low, then step S231 is executed, which controls the indoor unit fan 60 to operate at the first preset fan speed. The first preset fan speed can be adjusted according to the fan selection, for example, 750 r / min (revolutions per minute). At this time, whether the electric heater 50 needs to be turned on depends on the blade temperature T. b Is it also low? Therefore, the control method executes step S232, which involves obtaining the current blade temperature T. b Next, determine the temperature T of the oscillating blades. b Is it less than (dew point temperature T)? d -△T1)(i.e., step S233). If the judgment result is negative, then repeat step S232, that is, re-acquire the current blade temperature T. bIf the judgment result is yes, then the electric heater 50 is controlled to turn on at a preset level, and the indoor unit fan 60 is controlled to operate at a second preset wind speed (i.e., step S234). The second preset wind speed is less than the first preset wind speed. In one or more embodiments, the second preset wind speed is 680 r / min. The preset level of the electric heater 50 can be the lowest level of the electric heater 50 to prevent excessive temperature rise and hot air from being blown out of the air outlet 10b. After step S234 is completed, the control method executes step S235, that is, after a preset time period, the louver temperature T is re-acquired. b In one or more embodiments, the preset time period is 5 seconds. Alternatively, the preset time period can also be set to other suitable time periods that are longer or shorter than 5 seconds. Next, the control method executes step S236, which involves determining the blade temperature T. b Is it greater than (dew point temperature T)? d +△T2). If the judgment result is negative, then repeat step S235, that is, after a preset time period, re-acquire the blade temperature T. b If the judgment result is yes, then the electric heater 50 is turned off, and the indoor unit fan 60 is controlled to run at the first preset fan speed (i.e., step S237). When step S237 is completed, the control method ends.

[0036] See also Figure 5 After executing step S230, if the judgment result is negative, then execute step S240, that is, determine the coil temperature T. p Does it fall within the second preset temperature range? If the result is yes, it means that the coil temperature T is currently within this range. p Lower, blade temperature T b It continues to drop and eventually falls below the dew point temperature T. d If the risk is greater, the indoor unit fan 60 is controlled to operate at the second preset fan speed, and the electric heater 50 is controlled to turn on at a preset level (i.e., step S241). After step S241 is completed, the control method executes step S242, that is, after a preset time period, the blade temperature T is reacquired. b Next, the control method executes step S243, which involves determining the blade temperature T. b Is it greater than (dew point temperature T)? d +△T2). If the judgment result is negative, then repeat step S242, that is, after a preset time period, re-acquire the blade temperature T. b If the judgment result is yes, then the electric heater 50 is turned off, and the indoor unit fan 60 is controlled to run at the first preset fan speed (i.e., step S244). When step S244 is completed, the control method ends.

[0037] See also Figure 5 After executing step S240, if the judgment result is negative, it indicates that the coil temperature T is not positive.p When the temperature falls within the third preset temperature range, the coil temperature T p It's already very low, the blade temperature T b Below the dew point temperature T d If the risk is too high, then step S250 is executed, which involves controlling the indoor unit fan 60 to operate at a first preset fan speed and controlling the electric heater 50 to turn on at a preset level. After the indoor unit fan 60 operates at a higher first preset fan speed, the heat generated by the electric heater 50 can be quickly transferred to the oscillating blades 30, thereby quickly and effectively reducing the oscillating blade temperature T. b After step S250 is completed,

[0038] The control method executes step S251, which involves re-acquiring the blade temperature T after a preset time period. b Next, the control method executes step S252, which involves determining the blade temperature T. b Is it greater than (dew point temperature T)? d +△T1). If the judgment result is negative, then repeat step S251, that is, after a preset time period, re-acquire the blade temperature T. b If the judgment result is yes, then the indoor unit fan 60 is controlled to operate at the second preset fan speed (i.e., step S253) to reduce the speed of the indoor unit fan 60. Next, the control method executes step S254, that is, after a preset time period, the blade temperature T is reacquired. b Next, the control method executes step S255, which involves determining the blade temperature T. b Is it greater than (dew point temperature T)? d +△T2). If the judgment result is negative, then repeat step S254, that is, after a preset time period, re-acquire the blade temperature T. b If the judgment result is yes, then the electric heater 50 is turned off, and the indoor unit fan 60 is controlled to run at the first preset fan speed (i.e., step S256). When step S256 is completed, the control method ends.

[0039] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method for an air conditioner, characterized by, When the air conditioner is in a dehumidification mode, the control method comprises: Acquiring a dew point temperature T of an indoor environment d and a temperature T of a swing blade of an indoor unit of the air conditioner b ; comparing the flap temperature T b and the dew point temperature T d ​ based on the comparison result, controlling at least part of the following parameters: the operating frequency of the compressor of the air conditioner, the opening degree of the electronic expansion valve of the air conditioner, the rotating speed of the indoor unit fan of the indoor unit, and the opening and closing of the electric heater of the indoor unit; The dew point temperature T is preset d a first difference value ΔT1, a second difference value ΔT2 and a third difference value ΔT3, wherein ΔT1< ΔT2< ΔT3. When (the dew point temperature T d + △T1) < the swing leaf temperature T b ≤ (the dew point temperature T d + △T2), the coil temperature T p of the indoor unit is acquired. determining whether the coil temperature T p is less than (the dew point temperature T d - ΔT3); when the judgment result is yes, reducing the operating frequency of the compressor, reducing the opening degree of the electronic expansion valve, and reducing the rotating speed of the indoor unit fan; when the judgment result is no, maintaining the operating frequency of the compressor, maintaining the opening degree of the electronic expansion valve, and maintaining the rotating speed of the indoor unit fan.

2. The control method for an air conditioner according to claim 1, characterized by, The step of acquiring the dew point temperature T of the indoor environment d includes: obtaining the dry-bulb temperature T and the relative humidity RH of the return air outlet of the indoor unit; Based on the dry-bulb temperature T and the relative humidity RH, the dew-point temperature T is obtained by looking up a psychrometric chart d .

3. The control method for an air conditioner according to claim 1, wherein When the swing-leaf temperature T b ≤ (the dew-point temperature T d + △T1), the coil temperature T p is acquired. comparing the coil temperature T p with a preset temperature interval; based on the coil temperature T p comparing the preset temperature interval, control the speed of the indoor unit fan, and control the opening and closing of the electric heater.

4. The control method for an air conditioner according to claim 3, wherein The dew point temperature T is preset d a fourth difference AT4 and a fifth difference AT5, wherein AT3 < AT4 < AT5. the preset temperature interval comprises: a first preset temperature interval, which is greater than or equal to (the dew point temperature T d -△T4) a second preset temperature interval, which is less than (the dew point temperature T d -△T4) and greater than or equal to (the dew point temperature T d -△T5); and a third predetermined temperature interval, which is less than (the dew point temperature T d -△T5).

5. The control method for an air conditioner according to claim 4, wherein when the coil temperature T p falls into the first preset temperature interval, controlling the indoor unit fan to operate at a first preset air speed; Acquire the current flap temperature T b ; comparing the current flap temperature T b with (the dew point temperature T d -△T1) When the current flap temperature T b is less than or equal to (the dew point temperature T d -△T1), the electric heater is controlled to be turned on at a preset gear, and the indoor unit fan is controlled to operate at a second preset wind speed. After a preset time period, the temperature T of the swing leaf is reacquired b ; The swing-leaf temperature T b is compared with (the dew-point temperature T d + ΔT2). When the re-acquired flap temperature T b is greater than (the dew point temperature T d +△T2), the electric heater is controlled to be turned off, and the indoor unit fan is controlled to operate at the first preset wind speed. wherein the first preset wind speed is greater than the second preset wind speed.

6. The control method for an air conditioner according to claim 5, characterized by, when the coil temperature T p falls into the second preset temperature interval, controlling the indoor unit fan to operate at the second preset air speed and controlling the electric heater to be turned on at a preset gear. After the preset time period, the temperature T of the swing leaf is reacquired b ; The swing-leaf temperature T b is compared with (the dew-point temperature T d + ΔT2). When the re-acquired flap temperature T b is greater than (the dew point temperature T d +△T2), the electric heater is controlled to be turned off, and the indoor unit fan is controlled to operate at the first preset wind speed.

7. The control method for an air conditioner according to claim 5, characterized by, when the coil temperature T p falls into the third preset temperature interval, controlling the indoor unit fan to operate at the first preset air speed and controlling the electric heater to be turned on at a preset gear. After the preset time period, the temperature T of the swing leaf is reacquired b ; The swing-leaf temperature T b with the dew-point temperature T d + ΔT1) is compared; When the re-acquired temperature T b greater than (the dew point temperature T d +△T1), the indoor unit fan is controlled to operate at the second preset air speed. After the preset time period, the swing leaf temperature T is acquired again b ; The swing-leaf temperature T b with (the dew-point temperature T d +△T2) is compared; When the swing-leaf temperature T b greater than (the dew-point temperature T d +△T2), the electric heater is controlled to be turned off, and the indoor unit fan is controlled to operate at the first preset air speed.

8. The control method for an air conditioner according to any one of claims 1 to 7, characterized by, The electric heater is arranged between the indoor heat exchanger of the indoor unit and the swing leaf of the indoor unit.

9. An air conditioner characterized by comprising: The control method for an air conditioner according to any one of claims 1-8 is executed in the air conditioner.

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