Control method of air conditioner and air conditioner

Abstract

The application relates to the technical field of air conditioners, and particularly provides a control method of an air conditioner and the air conditioner, which at least solves the problem that the mute mode function of an existing air conditioner is single and cannot meet the user demand. The control method comprises the following steps: controlling the air conditioner to enter a selected mute mode, determining a preset temperature difference threshold value based on the selected mute mode; acquiring a selected wind speed, and controlling the indoor fan of the air conditioner to operate at the selected wind speed; controlling the compressor of the air conditioner to operate at an initial frequency; acquiring the dew point temperature Tl of indoor air and the indoor evaporator coil temperature Tp, calculating the corrected temperature Tp' of the indoor evaporator coil, and calculating the first difference value of Tp' and Tl; comparing the first difference value with the preset temperature difference threshold value, and selectively adjusting the frequency of the compressor based on the comparison result. The control method provided by the application adjusts the temperature and humidity of indoor air by adjusting the frequency of the compressor, so that the user experiences a more comfortable air environment.

Description

Technical Field

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

[0002] Current air conditioner silent modes simply control the compressor to run at the lowest frequency and the indoor fan to run at the lowest speed, without considering the actual needs of the user. Because modern buildings are well-insulated, users typically require relatively less cooling in cooling scenarios. Furthermore, elderly people and children are particularly sensitive to airflow, noise, and humidity, making simple room temperature control insufficient. Therefore, there is a need for a control method that allows users to personalize their room air quality settings within a silent mode. Summary of the Invention

[0003] The present invention aims to solve the above-mentioned technical problems, namely, to at least solve the problem that the existing air conditioner's silent mode function is limited and cannot meet user needs.

[0004] In a first aspect, the present invention provides a control method for an air conditioner, characterized in that the control method includes:

[0005] S1. Control the air conditioner to enter the selected silent mode, and determine a preset temperature difference threshold based on the selected silent mode. The preset temperature difference threshold and the selected silent mode have a preset mapping relationship.

[0006] S2. Obtain the selected wind speed and control the indoor fan of the air conditioner to run at the selected wind speed; control the compressor of the air conditioner to run at the initial frequency for a first preset time;

[0007] S3. Obtain the dew point temperature Tl of the indoor air and the indoor evaporator coil temperature Tp, calculate the corrected temperature Tp' of the indoor evaporator coil, and calculate the first difference between Tp' and Tl.

[0008] S4, compare the first difference with the preset temperature difference threshold, and selectively adjust the frequency of the compressor based on the comparison result.

[0009] The air conditioner control method provided by this invention not only provides users with more fan speed options when operating in silent mode, thereby creating a low-noise environment for users according to their actual needs, but also ensures stable indoor temperature and suitable air humidity. It effectively solves the problem that traditional air conditioners cannot meet the diverse air change needs of users in silent mode, bringing users a more comfortable and personalized indoor environment experience.

[0010] In some feasible embodiments of the above-mentioned air conditioner control method, the preset temperature difference threshold includes a first preset temperature difference threshold and a second preset temperature difference threshold, wherein the temperature difference range that is greater than or equal to the first preset temperature difference threshold and less than or equal to the second preset temperature difference threshold is the preset temperature difference range, and step S4 includes:

[0011] S41. Determine whether the first difference is within the preset temperature difference range. If yes, proceed to step S42; otherwise, proceed to step S43.

[0012] S42. Control the compressor to continue running at the current frequency for a second preset duration;

[0013] S43. Based on the comparison result between the first difference and the preset temperature difference range, selectively adjust the frequency of the compressor, and then execute step S44.

[0014] S44. After the compressor runs at the adjusted frequency for a third preset duration, return to step S3.

[0015] Based on the determination of whether the difference between the evaporator coil's corrected temperature Tp' and the indoor air's dew point temperature Tl is within the preset temperature difference range, the air conditioner automatically adjusts the compressor's operating frequency. This effectively adjusts the air conditioner's cooling capacity, thereby achieving fine-tuning of the indoor temperature to ensure it remains within a comfortable range for humans. This avoids large fluctuations in indoor temperature and improves the user experience.

[0016] In some feasible embodiments of the above-described air conditioner control method, step S43 includes:

[0017] S431. If the first difference is less than the first preset temperature difference threshold, then the compressor is frequency-reduced, and step S44 is executed again; or

[0018] S432. If the first difference is greater than the second preset temperature difference threshold, then the compressor is frequency-increased, and then step S44 is executed.

[0019] Understandably, if the first difference is less than the first preset temperature difference threshold, reducing the compressor's operating frequency weakens the refrigerant's compression within the compressor, leading to a decrease in the temperature and pressure of the refrigerant entering the evaporator. This means the refrigerant's heat exchange efficiency in the evaporator decreases, causing the evaporator coil temperature to rise. Consequently, the first difference increases, ensuring it remains within the preset temperature difference range and meets the temperature control requirements in silent mode. Similarly, if the first difference is greater than the second preset temperature difference threshold, increasing the compressor's operating frequency enhances the refrigerant's compression within the compressor, leading to an increase in the temperature and pressure of the refrigerant entering the evaporator. This means the refrigerant's heat exchange efficiency in the evaporator increases, causing the evaporator coil temperature to fall. Consequently, the first difference decreases, ensuring it remains within the preset temperature difference range and meets the temperature control requirements in silent mode.

[0020] In some feasible embodiments of the above-mentioned air conditioner control method, the preset temperature difference threshold further includes a third preset temperature difference threshold, the third preset temperature difference threshold being greater than the second preset temperature difference threshold, and the second preset frequency change rate being greater than the first preset frequency change rate. Step S432 includes:

[0021] S4321. If the first difference is greater than the second preset temperature difference threshold and less than the third preset temperature difference threshold, then the compressor is frequency-increased using the first preset frequency change rate, and step S44 is executed again; or

[0022] S4322. If the first difference is greater than or equal to the third preset temperature difference threshold, then the compressor is frequency-increased using the second preset frequency change rate, and then step S44 is executed.

[0023] It should be noted that when the first difference is greater than the second preset temperature difference threshold and less than the third preset temperature difference threshold, that is, although the first difference is outside the preset temperature difference range, it is relatively close to the preset temperature difference range. In this case, by increasing the frequency of the compressor with a smaller first preset frequency change rate, the coil temperature is slowly reduced, so that the first difference can be kept within the preset temperature difference range. This can avoid the situation where the compressor frequency is over-adjusted in a short period of time and needs to be adjusted back and forth. When the first difference is greater than or equal to the third preset temperature difference threshold, that is, the first difference is far from the preset temperature difference range, in this case, by increasing the frequency of the compressor with a larger second preset frequency change rate, the coil temperature is reduced relatively quickly, so that the first difference can be kept within the preset temperature difference range. This can effectively shorten the temperature control adjustment time of the air conditioner.

[0024] In some feasible implementations of the above-mentioned air conditioner control method, the silent mode includes a silent dehumidification mode. If the air conditioner is controlled to enter the silent dehumidification mode, then both the first preset temperature difference threshold and the second preset temperature difference threshold are less than zero.

[0025] It should be noted that both the first preset temperature difference threshold and the second preset temperature difference threshold are less than zero. That is, the first difference within the preset temperature difference range is less than zero, meaning that the corrected temperature Tp' of the coil is less than the dew point temperature Tl of the indoor air. When air flows over the surface of the evaporator coil, the water vapor in the air will condense into water when it encounters the cooler surface of the coil. This process is called condensation. During the condensation process, the water vapor in the air is converted into liquid water, reducing the moisture content in the air, thereby achieving the dehumidification effect.

[0026] In some feasible embodiments of the above-described air conditioner control method, the silent mode includes a silent humidity control mode. If the air conditioner is controlled to enter the silent humidity control mode, then before executing step S3, the control method further includes:

[0027] S30. Take the average value of the relative humidity of indoor air measured multiple times to obtain the relative humidity reference value Up;

[0028] S31. Measure the real-time relative humidity value U of indoor air;

[0029] S32. Calculate the second difference between the real-time relative humidity value U and the humidity reference value Up, and determine whether the second difference is within the preset humidity difference range. If yes, proceed to step S42; otherwise, proceed to step S3.

[0030] It should be noted that since the silent constant humidity mode requires the indoor air relative humidity to be stably within a certain humidity range, if the second difference between the real-time indoor air relative humidity value U and the humidity reference value Up is within the preset humidity difference range before frequency adjustment and temperature control, it means that the indoor air relative humidity is within the required humidity range. At this time, there is no need to adjust the compressor frequency; the compressor will continue to run at the current frequency to maintain the air conditioner in silent constant humidity mode. If the second difference between the real-time indoor air relative humidity value U and the humidity reference value Up is not within the preset humidity difference range, then frequency adjustment and temperature control will change the indoor air relative humidity to bring it within the required humidity range.

[0031] In some feasible implementations of the above-mentioned air conditioner control method, the silent mode includes a silent humidification mode. If the air conditioner is controlled to enter the silent humidification mode, the first preset temperature difference threshold is greater than zero.

[0032] It should be noted that both the first and second preset temperature difference thresholds are greater than zero. That is, the first difference within the preset temperature difference range is greater than zero, which means that the required correction temperature Tp' of the coil must be higher than the dew point temperature Tl of the indoor air. When air flows over the surface of the evaporator coil, the water vapor in the air is less likely to condense when it encounters the higher temperature of the coil surface, while the condensate produced by the coil is more likely to evaporate, thereby increasing the moisture content in the air and achieving the humidification effect.

[0033] In some feasible embodiments of the above-described air conditioner control method, the silent mode includes an AI silent mode. If the air conditioner is controlled to enter the AI ​​silent mode, the control method further includes the following steps before executing step S2:

[0034] S20. Measure indoor temperature and humidity, and obtain local time information;

[0035] S21. Select the wind speed based on the third difference between the indoor temperature and the set indoor temperature, the indoor humidity, and the time information;

[0036] The selected wind speed has a preset mapping relationship with the third difference, the indoor humidity, and the time information.

[0037] It should be noted that when the air conditioner enters AI silent mode, it can select an appropriate fan speed based on the third difference between the indoor temperature and the set indoor temperature, the indoor humidity, and the time information. At the same time, it can also adjust the compressor frequency based on the comparison result of the first difference and the preset temperature difference threshold, so as to adjust the temperature and humidity for the user without much user intervention or operation, providing a more comfortable silent mode for the user.

[0038] In some feasible embodiments of the above-described air conditioner control method, after performing step S4, the control method further includes:

[0039] S5. Determine whether the air conditioner has entered the PID control mode for the compressor frequency. If yes, notify the user to exit the silent mode or remind the user to lower the indoor set temperature. If no, return and repeat step S3.

[0040] It should be noted that the PID control mode for compressor frequency can monitor the compressor's operating frequency and adjust it according to a preset PID control algorithm to control the compressor's operating status and performance. Specifically, when adjusting the compressor frequency to allow the air conditioner to enter the desired silent mode, if the compressor's operating frequency changes too quickly, the PID controller can notify the user to exit the silent mode or remind the user to lower the indoor set temperature to stabilize the compressor's operating status and prevent the compressor frequency from changing too quickly, which could lead to system instability or damage to the equipment.

[0041] In a second aspect, the present invention also provides an air conditioner, the air conditioner including a control device, the control device including a memory and a processor, the memory storing a computer program, and the processor being configured to execute the control method described in any of the foregoing technical solutions through the computer program.

[0042] Those skilled in the art will understand that, since the air conditioner is capable of executing the control method in any of the aforementioned technical solutions, it possesses all the technical effects that the aforementioned control method can achieve, and will not be elaborated further here. Attached Figure Description

[0043] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0044] Figure 1 This is a flowchart of the control method for an air conditioner provided in Embodiment 1 of the present invention;

[0045] Figure 2 A detailed flowchart of step S43 of the air conditioner control method provided in Embodiment 1 of the present invention;

[0046] Figure 3 This is a flowchart of the control method for an air conditioner provided in Embodiment 2 of the present invention. Detailed Implementation

[0047] 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. Those skilled in the art can make adjustments as needed to adapt to specific applications. For example, although the following embodiments are described using a split-type household air conditioner as an example, this is not limiting. The technical solution of the present invention is also applicable to other types of air conditioners such as integrated air conditioners and built-in air conditioners. Such changes in application do not deviate from the spirit of the present invention and should all be limited within the scope of protection of the present invention.

[0048] To better illustrate the invention, numerous specific details are set forth in the following detailed description. Those skilled in the art will understand that the invention can be practiced without certain specific details.

[0049] In the description of this invention, terms such as "upper," "lower," "inner," and "outer," which indicate direction or positional relationships, are based on actual application and are used merely for ease of description. They do not indicate or imply that the device to be protected must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, ordinal numbers such as "first" and "second" are used only for convenience of explanation and are not used to indicate or imply relative importance.

[0050] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] The air conditioner provided by this invention includes a compressor, an evaporator, a condenser, a throttling device, and an indoor fan. The compressor compresses the intake of low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas. The throttling device reduces the pressure and temperature of the refrigerant, transforming the high-pressure liquid into a low-temperature, low-pressure liquid after passing through the throttling device. This helps control the refrigerant flow and pressure, ensuring a complete refrigerant circulation loop and stable system operation. The indoor fan blows the air processed by the evaporator into the room, thereby achieving air circulation and temperature regulation. The evaporator primarily exchanges heat with the indoor air, and the condenser primarily exchanges heat with the outdoor air. These five components work together, through the four basic processes of compression, condensation, throttling, and evaporation, to achieve the cooling and heating functions of the air conditioner.

[0052] Current air conditioner silent modes simply control the compressor to run at the lowest frequency and the indoor fan to run at the lowest speed, without considering the actual needs of the user. Because modern buildings are well-insulated, users typically require relatively low cooling capacity. Furthermore, elderly people and children are more sensitive to airflow, noise, and humidity, making simple room temperature control insufficient. To address these issues, this invention provides an air conditioner control method that allows users to personalize their room air quality settings in silent mode.

[0053] Example 1

[0054] like Figure 1As shown, the air conditioner control method provided by the present invention includes:

[0055] S1. Control the air conditioner to enter the selected silent mode, determine the preset temperature difference threshold based on the selected silent mode, and the preset temperature difference threshold has a preset mapping relationship with the selected silent mode.

[0056] It should be noted that the selected silent mode can be one chosen by the user based on their needs. For example, users can choose a silent dehumidification mode, a silent constant humidity mode, or a silent humidification mode based on the humidity level in the room. Alternatively, the selected silent mode can be an AI silent mode that automatically adjusts based on indoor temperature, humidity, and local time information. This AI silent mode can be set to start automatically upon power-on or activated by the user. Different silent modes correspond to different preset temperature difference thresholds. The specific preset temperature difference thresholds are related to the operating parameters of the corresponding silent mode and were determined through experimental testing to ensure that different silent modes create different indoor air environments.

[0057] S2. Obtain the selected wind speed and control the indoor fan of the air conditioner to run at the selected wind speed; control the compressor of the air conditioner to run at the initial frequency for a first preset time.

[0058] Specifically, after entering the selected silent mode, users can be guided to select the indoor fan speed. Compared to the existing fixed-frequency, fixed-speed silent mode, this provides users with more speed options to meet different needs. For example, the minimum selectable speed can be set to Smin, and the maximum silent speed to Smax. Smin can be set to 400 rpm, and Smax to 1200 rpm. Users can then adjust the speed between 400 rpm and 1200 rpm, with each adjustment increment within ±50 rpm. More precise speed control can also be provided. The selected fan speed directly affects the noise level. If users find the fan noise too loud, they can manually reduce the indoor fan speed. Conversely, if they feel the airflow is too weak, they can manually increase the indoor fan speed. Since different fan speeds affect the coil temperature, which in turn affects air humidity, the coil temperature needs to be adjusted by regulating the compressor frequency after the fan speed is determined.

[0059] The compressor's initial frequency is the silent initial frequency set by the developers based on multiple tests. The first preset duration is also the compressor's running duration set by the developers based on multiple tests. For example, the first preset duration can be set to 5 minutes. After entering silent mode, by controlling the compressor to run at the initial frequency for the first preset duration, the compressor or the entire air conditioning system can be guaranteed to run stably before subsequent frequency adjustment and temperature control.

[0060] S3. Obtain the dew point temperature Tl of the indoor air and the indoor evaporator coil temperature Tp, calculate the corrected temperature Tp' of the indoor evaporator coil, and calculate the first difference between Tp' and Tl.

[0061] Specifically, temperature and humidity data of indoor air can be obtained through temperature and relative humidity sensors. Then, the dew point temperature Tl of the current indoor air can be calculated based on the obtained temperature and humidity data. Alternatively, the dew point temperature can be obtained directly by querying the correspondence between dew point temperature and air temperature and humidity. The indoor evaporator coil temperature Tp can be measured in real time by temperature sensors or other temperature measuring components.

[0062] It should be noted that since the indoor evaporator coil temperature Tp is constantly changing for most of the time, when calculating the temperature difference between the indoor evaporator coil temperature Tp and the indoor air dew point temperature Tl, temperature compensation needs to be applied to the measured coil temperature Tp. For example, a coil temperature compensation Δa can be added to compensate for the actual feedback coil temperature Tp. By adding the coil temperature compensation Δa to the coil temperature Tp, the corrected temperature Tp' of the indoor evaporator coil can be obtained. In other words, by calculating Tp + Δa - Tl, the difference between Tp' and Tl, i.e., the first difference, can be obtained. The value of the coil temperature compensation Δa is related to the sales area, evaporator size, air conditioning cooling capacity, evaporator flow path, or temperature and humidity in the sales environment. The specific value is set by the developers during the development of the air conditioner and adjusted according to the region to be sold.

[0063] S4. Compare the first difference with the preset temperature difference threshold, and selectively adjust the compressor frequency based on the comparison result.

[0064] It should be noted that in silent mode, in addition to the initial silent operating frequency C1 Hz, the compressor also has a maximum silent operating frequency C. max When the user enters silent mode via remote control, the compressor operates at a frequency of C1 Hz. Furthermore, when the frequency is increased via boost / up / down logic, the compressor's operating frequency cannot exceed C1 Hz. max Hz, by setting the maximum silent operating frequency C max Hz can prevent the compressor frequency from being too high in silent mode, which could cause room temperature to become disordered. Adjusting the compressor frequency directly affects the amount of refrigerant circulating and the efficiency of heat exchange, thus affecting the temperature and humidity of the indoor air.

[0065] Specifically, when the preset temperature difference threshold includes a first preset temperature difference threshold and a second preset temperature difference threshold, and the temperature difference range that is greater than or equal to the first preset temperature difference threshold and less than or equal to the second preset temperature difference threshold is the preset temperature difference range, such as... Figure 2 As shown, step S4 includes:

[0066] S41. Determine whether the first difference is within the preset temperature difference range. If yes, proceed to step S42; otherwise, proceed to step S43.

[0067] S42. Control the compressor to continue running at the current frequency for a second preset duration.

[0068] S43. Based on the comparison result between the first difference and the preset temperature difference range, selectively adjust the frequency of the compressor, and then execute step S44.

[0069] S44. After the compressor runs at the adjusted frequency for a third preset duration, return to step S3.

[0070] In other words, the air conditioner can automatically adjust the compressor's operating frequency based on whether the first difference between the evaporator coil's corrected temperature Tp' and the indoor air's dew point temperature Tl is within a preset temperature difference range. If the first difference is within the preset temperature difference range, it means the current indoor temperature is the temperature required for the selected silent mode. Therefore, it is not necessary to change the compressor's frequency; the compressor can continue running at the current frequency for a second preset time. The specific value of the second preset time is set by the developers based on testing; for example, the second preset time could be 3 minutes. If the first difference is outside the preset temperature difference range, the air conditioner's cooling capacity can be effectively controlled by increasing or decreasing the compressor's operating frequency. This allows for fine-tuning of indoor temperature and humidity, ensuring the indoor temperature remains within the set comfortable range, avoiding large fluctuations in indoor temperature, and providing a more comfortable living environment.

[0071] Based on step S4 above, step S43 includes:

[0072] S431. If the first difference is less than the first preset temperature difference threshold, then the compressor is frequency reduced, and then step S44 is executed.

[0073] It is understandable that when the first difference is less than the first preset temperature difference threshold, the compressor operating frequency is reduced, which weakens the compression of the refrigerant in the compressor, resulting in a decrease in the temperature and pressure of the refrigerant entering the evaporator. In other words, the heat exchange efficiency of the refrigerant in the evaporator decreases, causing the coil temperature of the evaporator to rise, thereby increasing the first difference between Tp' and Tl, so that the first difference can be within the preset temperature difference range, meeting the temperature control requirements in silent mode.

[0074] S432. If the first difference is greater than the second preset temperature difference threshold, then the compressor is frequency-increased, and then step S44 is executed.

[0075] Understandably, when the first difference is greater than the second preset temperature difference threshold, the compressor operating frequency is increased, the refrigerant compression in the compressor is enhanced, which leads to an increase in the temperature and pressure of the refrigerant entering the evaporator. In other words, the heat exchange efficiency of the refrigerant in the evaporator is increased, which lowers the coil temperature of the evaporator, thereby reducing the first difference between Tp' and Tl, so that the first difference can be within the preset temperature difference range, meeting the temperature control requirements in silent mode.

[0076] Based on step S43 above, step S432 includes:

[0077] S4321. If the first difference is greater than the second preset temperature difference threshold and less than the third preset temperature difference threshold, then the compressor is frequency-increased using the first preset frequency change rate, and then step S44 is executed.

[0078] It should be noted that when the first difference is greater than the second preset temperature difference threshold and less than the third preset temperature difference threshold, that is, although the first difference is outside the preset temperature difference range, it is relatively close to the preset temperature difference range. In this case, the compressor is frequency increased by a smaller first preset frequency change rate, so that the coil temperature decreases slowly and the first difference can be within the preset temperature difference range. This can avoid the compressor frequency being over-adjusted in a short period of time and needing to be adjusted back and forth.

[0079] S4322. If the first difference is greater than or equal to the third preset temperature difference threshold, then the compressor is frequency-increased using the second preset frequency change rate, and then step S44 is executed.

[0080] Among them, the third preset temperature difference threshold is greater than the second preset temperature difference threshold, and the second preset frequency change rate is greater than the first preset frequency change rate. For example, the first preset frequency change rate can be to increase the frequency by 1Hz / 10s (i.e., change the frequency by 1Hz within 10s) and then wait for 20s; the second preset frequency change rate can be to increase the frequency by 1Hz / 10s and then wait for 10s. Whether it is to wait for 10s or 20s after increasing the frequency, it is to give the compressor a buffer time after increasing the frequency and ensure that the compressor has a stable operating state.

[0081] It should be noted that when the first difference is greater than or equal to the third preset temperature difference threshold, that is, when the first difference is far from the preset temperature difference range, the compressor is frequency-increased by using a larger second preset frequency change rate, so that the coil temperature drops relatively quickly and the first difference can be within the preset temperature difference range, which can effectively shorten the temperature control adjustment time of the air conditioner.

[0082] The air conditioner control method provided by this invention offers users more fan speed options when selecting the silent mode, allowing users or intelligent AI to create a suitable indoor air environment according to actual needs. After the indoor fan speed changes according to the selected fan speed, the method calculates the first difference between the corrected temperature Tp' of the indoor evaporator coil and the dew point temperature Tl of the indoor air. Based on the comparison between the first difference and a preset temperature difference threshold, the compressor frequency is adjusted. Different preset temperature difference thresholds are used depending on the selected silent mode. This not only meets the silent mode requirement but also regulates the indoor air humidity, providing users with a more comfortable air environment. This solves the problem that the existing air conditioners have a single silent mode function that cannot meet the different needs of users.

[0083] Example 2

[0084] like Figure 3 As shown, in order to protect the compressor from frequency changes, based on the above embodiment, after executing step S4, the control method further includes:

[0085] S5. Determine whether the air conditioner has entered the PID control mode for the compressor frequency. If yes, notify the user to exit the silent mode or remind the user to lower the indoor set temperature. If no, return and repeat step S3.

[0086] It should be noted that the PID control mode for compressor frequency monitors the compressor's operating frequency and adjusts it according to a preset PID control algorithm to control the compressor's operating status and performance. Specifically, when adjusting the compressor frequency to put the air conditioner into the desired silent mode, if the compressor's operating frequency changes too rapidly, the PID controller can notify the user to exit the silent mode or remind the user to lower the indoor set temperature to stabilize the compressor's operating status and prevent the compressor frequency from changing too quickly, which could lead to system instability or equipment damage.

[0087] Example 3

[0088] The silent mode of the air conditioner includes a silent dehumidification mode. Based on the above embodiment, if the air conditioner is controlled to enter the silent dehumidification mode, the first preset temperature difference threshold and the second preset temperature difference threshold are both less than zero.

[0089] It should be noted that both the first and second preset temperature difference thresholds are less than zero. That is, the first difference within the preset temperature difference range is less than zero, which means that the required correction temperature Tp' of the coil must be less than the dew point temperature Tl of the indoor air. When air flows over the surface of the evaporator coil, the water vapor in the air condenses into water when it encounters the cooler coil surface. This process is called condensation. During condensation, the water vapor in the air is converted into liquid water, reducing the moisture content in the air and thus achieving the dehumidification effect.

[0090] When the air conditioner is in operation, to control it to enter the silent dehumidification mode, the compressor frequency needs to be adjusted so that the corrected temperature Tp' of the coil is lower than the dew point temperature Tl of the indoor air. In other words, the first difference is made less than zero by adjusting the frequency. After adjusting the compressor frequency, when the indoor air passes through the cooler evaporator coil, the water molecules in the air will condense on the evaporator surface. At this time, the water molecule content in the indoor air will decrease. When the water molecule content is significantly reduced, it can lower the indoor air temperature and also reduce the relative humidity of the indoor air. The humidity will become more comfortable for the user, thereby improving the user experience.

[0091] In silent dehumidification mode, the first preset temperature difference threshold and the second preset temperature difference threshold can be 2Δb and Δb, respectively. The specific value of Δb is set by the developers through testing. The change in the value of Δb will directly affect the temperature adjustment range of indoor air and the actual dehumidification effect in silent dehumidification mode. The value range of Δb is -4 to -1. For example, the value of Δb is -2, which means that the preset temperature difference range is -4 to -2. On this basis, a third preset temperature difference threshold Δm can also be set. Δm can be 2. Different frequency change rates can be used by comparing the first difference Tp+Δa-Tl with the third preset temperature difference threshold Δm. For details, please refer to Table 1 below.

[0092] Table 1 Frequency Adjustment Strategy of Air Conditioner in Silent Dehumidification Mode

[0093]

[0094] Example 4

[0095] The air conditioner's silent mode includes a silent humidity control mode. Based on the above embodiment, if the air conditioner is controlled to enter the silent humidity control mode, the control method further includes the following steps before executing step S3:

[0096] S30. Take the average value of the relative humidity of indoor air measured multiple times to obtain the relative humidity reference value Up.

[0097] S31. Measure the real-time relative humidity value U of indoor air.

[0098] S32. Calculate the second difference between the real-time relative humidity value U and the humidity reference value Up, and determine whether the second difference is within the preset humidity difference range. If yes, proceed to step S42; otherwise, proceed to step S3.

[0099] It should be noted that since the silent constant humidity mode requires the indoor air relative humidity to be stably within a certain humidity range, if the second difference between the real-time indoor air relative humidity value U and the humidity reference value Up is within the preset humidity difference range before frequency adjustment and temperature control, it means that the indoor air relative humidity is within the required humidity range. In this case, there is no need to adjust the compressor frequency; the compressor will continue to run at the current frequency to maintain the air conditioner in silent constant humidity mode. If the second difference between the real-time indoor air relative humidity value U and the humidity reference value Up is not within the preset humidity difference range, then frequency adjustment and temperature control will change the indoor air relative humidity to bring it within the required humidity range.

[0100] When the air conditioner is working, if the evaporator does not produce condensate, the moisture content of the room air will remain unchanged. If the room temperature decreases, the room humidity will increase. At this time, it is necessary to adjust the frequency of the compressor so that the air conditioner evaporator produces a certain amount of condensate to reduce the room humidity. This ensures that while the room temperature decreases, too much or too little condensate is produced, which means ensuring the stability of the relative humidity of the indoor air and allowing users to experience a constant humidity air environment.

[0101] In silent constant humidity mode, the preset humidity difference range can be -5% to 5%. The compressor frequency is adjusted based on whether the second difference U-Up falls within this range. If U-Up is outside the preset humidity difference range, different preset temperature difference ranges can be selected based on its position within that range. For example, when U-Up < -5%, the preset temperature difference range can be 0 to Δc; when 5% < U-Up < 10%, the range can be -Δc to 0; and when U-Up ≥ 10%, the range can be -2Δc to -Δc. The specific value of Δc is set by the developers through testing. Changes in Δc directly affect the dehumidification effect on indoor air in this silent constant humidity mode. The value of Δc can range from 1 to 4; for example, Δc can be 2. See Table 2 below for details.

[0102] Table 2 Frequency Adjustment Strategy of Air Conditioner in Silent and Constant Humidity Mode

[0103]

[0104] Example 5

[0105] The silent mode of the air conditioner includes a silent humidification mode. Based on the above embodiments, if the air conditioner is controlled to enter the silent humidification mode, the first preset temperature difference threshold is greater than zero.

[0106] It should be noted that both the first and second preset temperature difference thresholds are greater than zero. That is, the first difference within the preset temperature difference range is greater than zero, which means that the required correction temperature Tp' of the coil must be higher than the dew point temperature Tl of the indoor air. When air flows over the surface of the evaporator coil, the water vapor in the air is less likely to condense when it encounters the higher temperature of the coil surface, while the condensate produced by the coil is more likely to evaporate, thereby increasing the moisture content in the air and achieving the humidification effect.

[0107] In silent humidification mode, the preset temperature difference range can be determined by Δd. The specific value of Δd is set by the developers through testing. The change in the value of Δd will directly affect the temperature adjustment range of indoor air and the actual humidification effect in silent humidification mode. The value range of Δd can be from 1 to 4. For example, the value of Δd can be 2. If 0 < Tp + Δa - Tl < Δd, the frequency is maintained. For details, please refer to Table 3 below.

[0108] Table 3 Frequency Adjustment Strategy of Air Conditioner in Silent Humidification Mode

[0109] Judgment conditions Frequency adjustment strategy Tp+Δa-Tl≤0 Frequency reduction 0 < Tp + Δa - Tl < Δd Frequency maintenance Δd≤Tp+Δa-Tl Frequency increases

[0110] Example 6

[0111] The air conditioner's silent mode includes an AI silent mode. Based on the above embodiment, if the air conditioner is controlled to enter the AI ​​silent mode, the control method further includes the following steps before executing step S2:

[0112] S20. Measure indoor temperature and humidity, and obtain local time information.

[0113] S21. Select the wind speed based on the third difference between the indoor temperature and the set indoor temperature, the indoor humidity, and the time information.

[0114] The selected wind speed has a preset mapping relationship with the third difference, indoor humidity and time information.

[0115] It should be noted that when the air conditioner enters AI silent mode, it can select an appropriate fan speed based on the third difference between the indoor temperature and the set indoor temperature, the indoor humidity, and the time information. At the same time, it can also adjust the compressor frequency based on the comparison result of the first difference and the preset temperature difference threshold, so as to adjust the temperature and humidity for the user without much user intervention or operation, providing a more comfortable silent mode for the user.

[0116] When the air conditioner is working in AI silent mode, if there is a large temperature difference between the room temperature and the set temperature, the indoor fan speed is increased to accelerate the cooling effect of the room. When the humidity is high, the temperature of the coil needs to be lower than the dew point temperature of the indoor air. By adjusting the frequency of the compressor, the first difference between the corrected temperature Tp' of the evaporator coil and the dew point temperature Tl of the indoor air can be controlled, thereby regulating the humidity in the room.

[0117] In this way, by adding an AI intelligent mode, it can meet users' needs for airflow and noise reduction while providing quiet cooling. It can also intelligently adjust the room humidity according to user needs to ensure indoor air comfort. At the same time, it can intelligently adjust the indoor air temperature according to user needs and the current environment to meet diverse user needs, thereby creating a good air quality home environment that meets users' requirements for airflow, noise, temperature, and humidity.

[0118] If the temperature difference between the room temperature and the set temperature is small, the indoor fan speed can be reduced to ensure a quiet user experience. During the day, when ambient noise is relatively high, the fan speed can be appropriately increased; at night, when it is relatively quiet, the fan speed can be reduced to minimize noise. The indoor fan speed can be adjusted by developers for different fan types, different user areas, and different environmental conditions. For example, when daytime hours are 8:00-20:00 and nighttime hours are 20:00-8:00, the difference between the room temperature and the set temperature is ΔT. The intelligent AI can select different fan speeds based on these temperature differences. See Table 4 below for details.

[0119] Table 4. Air Conditioner Speed ​​Selection Table in AI Silent Mode

[0120]

[0121] Humidity levels are generally controlled between 50% and 65%. Maintaining suitable indoor humidity helps improve living comfort, prevents symptoms of colds or other illnesses, and protects the user's health. Of course, intelligent AI can select different humidity ranges based on different regions and seasons. When using frequency-controlled temperature, different preset temperature difference ranges can be selected based on the indoor humidity (RH) range. For example, when RH ≥ 75%, the preset temperature difference range can be -3Δf to -2Δf; when 65% < RH < 75%, the preset temperature difference range can be -2Δf to -Δf; when 50% ≤ RH ≤ 65%, the preset temperature difference range can be -Δf to 0. Within this humidity range, the air conditioner maintains a slight dehumidification state because in silent cooling mode, the temperature drops, causing the indoor humidity to rise. Maintaining slight dehumidification ensures that the indoor humidity remains stable within this range. When RH < 50%, the preset temperature difference range can be 0 to Δf. The specific value of Δf is set by the developers through testing. The change in the value of Δf will directly affect the dehumidification effect on indoor air in AI silent mode. The value of Δf can be from 1 to 4. For example, the value of Δf can be 2. For details, please refer to Table 5 below.

[0122] Table 5 Frequency Adjustment Strategy of Air Conditioner in AI Silent Mode

[0123]

[0124] This invention also provides an air conditioner, which includes a control device. The control device includes a memory and a processor. The memory stores a computer program, and the processor is configured to execute the control method in any of the foregoing technical solutions through the computer program.

[0125] In the description of this invention, "processor" can include hardware, software, or a combination of both. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. A processor has data and / or signal processing capabilities. A processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc.

[0126] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0127] 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 in that, The control method includes: S1. Control the air conditioner to enter the selected silent mode, and determine a preset temperature difference threshold based on the selected silent mode. The preset temperature difference threshold and the selected silent mode have a preset mapping relationship. S2. Obtain the selected wind speed and control the indoor fan of the air conditioner to run at the selected wind speed; control the compressor of the air conditioner to run at the initial frequency for a first preset time; S3. Obtain the dew point temperature Tl of the indoor air and the indoor evaporator coil temperature Tp, calculate the corrected temperature Tp' of the indoor evaporator coil, and calculate the first difference between Tp' and Tl. S4, compare the first difference with the preset temperature difference threshold, and selectively adjust the frequency of the compressor based on the comparison result.

2. The control method for an air conditioner according to claim 1, characterized in that, The preset temperature difference threshold includes a first preset temperature difference threshold and a second preset temperature difference threshold, wherein the temperature difference range that is greater than or equal to the first preset temperature difference threshold and less than or equal to the second preset temperature difference threshold is the preset temperature difference range. Step S4 includes: S41. Determine whether the first difference is within the preset temperature difference range. If yes, proceed to step S42; otherwise, proceed to step S43. S42. Control the compressor to continue running at the current frequency for a second preset duration; S43. Based on the comparison result between the first difference and the preset temperature difference range, selectively adjust the frequency of the compressor, and then execute step S44. S44. After the compressor runs at the adjusted frequency for a third preset duration, return to step S3.

3. The control method for an air conditioner according to claim 2, characterized in that, Step S43 includes: S431. If the first difference is less than the first preset temperature difference threshold, then the compressor is frequency-reduced, and step S44 is executed again; or S432. If the first difference is greater than the second preset temperature difference threshold, then the compressor is frequency-increased, and then step S44 is executed.

4. The control method for an air conditioner according to claim 3, characterized in that, The preset temperature difference threshold further includes a third preset temperature difference threshold, which is greater than the second preset temperature difference threshold, and the second preset frequency change rate is greater than the first preset frequency change rate. Step S432 includes: S4321. If the first difference is greater than the second preset temperature difference threshold and less than the third preset temperature difference threshold, then the compressor is frequency-increased using the first preset frequency change rate, and step S44 is executed again; or S4322. If the first difference is greater than or equal to the third preset temperature difference threshold, then the compressor is frequency-increased using the second preset frequency change rate, and then step S44 is executed.

5. The control method for an air conditioner according to claim 3, characterized in that, The silent mode includes a silent dehumidification mode. If the air conditioner is controlled to enter the silent dehumidification mode, both the first preset temperature difference threshold and the second preset temperature difference threshold are less than zero.

6. The control method for an air conditioner according to claim 3, characterized in that, The silent mode includes a silent humidity control mode. If the air conditioner is controlled to enter the silent humidity control mode, the control method further includes the following steps before executing step S3: S30. Take the average value of the relative humidity of indoor air measured multiple times to obtain the relative humidity reference value Up; S31. Measure the real-time relative humidity value U of indoor air; S32. Calculate the second difference between the real-time relative humidity value U and the humidity reference value Up, and determine whether the second difference is within the preset humidity difference range. If yes, proceed to step S42; otherwise, proceed to step S3.

7. The control method for an air conditioner according to claim 3, characterized in that, The silent mode includes a silent humidification mode. If the air conditioner is controlled to enter the silent humidification mode, the first preset temperature difference threshold is greater than zero.

8. The control method for an air conditioner according to claim 3, characterized in that, The silent mode includes an AI silent mode. If the air conditioner is controlled to enter the AI ​​silent mode, the control method further includes the following steps before executing step S2: S20. Measure indoor temperature and humidity, and obtain local time information; S21. Select the wind speed based on the third difference between the indoor temperature and the set indoor temperature, the indoor humidity, and the time information; The selected wind speed has a preset mapping relationship with the third difference, the indoor humidity, and the time information.

9. The control method for an air conditioner according to claim 1, characterized in that, After performing step S4, the control method further includes: S5. Determine whether the air conditioner has entered the PID control mode for the compressor frequency. If yes, notify the user to exit the silent mode or remind the user to lower the indoor set temperature. If no, return and repeat step S3.

10. An air conditioner, characterized in that, The air conditioner includes a control device, which includes a memory and a processor. The memory stores a computer program, and the processor is configured to execute the control method of any one of claims 1 to 9 through the computer program.

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