Air conditioner and control method and device thereof, storage medium and computer program product

Abstract

The invention discloses a control method and device of an air conditioner, the air conditioner, a storage medium and a computer program product, and the method comprises the steps that in the refrigeration operation process of the air conditioner, whether the current environment is in a temperature and humidity state needing preferential dehumidification or not is determined according to the indoor environment temperature and the indoor relative humidity; if it is determined that the current environment is in the temperature and humidity state needing preferential dehumidification, the frequency of a compressor and the rotating speed of an inner fan are adjusted, and the air conditioner executes dehumidification operation; after the dehumidification operation is completed, the environment dew point temperature is calculated based on the indoor environment temperature and the indoor relative humidity; dynamically adjusting the running frequency of the compressor and the rotating speed of the inner fan according to the environment dew-point temperature and the evaporator surface temperature to enable the evaporator surface temperature to be higher than the environment dew-point temperature. According to the scheme, the anti-condensation response speed is increased, the control precision and the environmental adaptability are improved, and the balance of efficient dehumidification and stable anti-condensation is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of air conditioners, and particularly relates to an air conditioner control method and device, an air conditioner, a storage medium and a computer program product. BACKGROUND

[0002] In the operation process of an air conditioning system, if the evaporator surface temperature is lower than the dew point temperature of ambient air, water vapor in the air will condense into dew on the evaporator surface, i.e., the dewing phenomenon. Air conditioner dewing prevention control mainly relies on setting a fixed lower limit of the evaporator temperature or indirectly affecting the evaporator surface temperature by controlling the fan speed. These methods have core problems of response lag, low control precision and poor adaptability. Especially in an environment with large humidity fluctuations, there is a lack of real-time judgment mechanism for the environmental humidity state, and it is difficult to achieve dynamic adjustment, resulting in unstable dewing prevention effect, affecting the balance between dehumidification and refrigeration, and failing to accurately and timely prevent the evaporator from dewing in different humidity environments.

[0003] The above content is only used to assist in understanding the technical solutions of the application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The purpose of the present application is to provide an air conditioner control method, device, air conditioner, storage medium and computer program product to solve the problem of lack of real-time judgment and dynamic adjustment of environmental humidity in the dewing prevention process of the air conditioner in related solutions, response lag, low control precision and poor adaptability, improve the dewing prevention response speed, improve the control precision and environmental adaptability, and achieve the balance between efficient dehumidification and stable dewing prevention.

[0005] The present application provides an air conditioner control method, comprising: obtaining the indoor environment temperature, indoor relative humidity and evaporator surface temperature during the refrigeration operation of the air conditioner; determining whether the current environment is in a temperature and humidity state requiring priority dehumidification according to the indoor environment temperature and the indoor relative humidity; if it is determined that the current environment is in a temperature and humidity state requiring priority dehumidification, adjusting the compressor frequency and the inner fan speed, so that the air conditioner performs dehumidification operation; after the dehumidification operation is completed, calculating the environmental dew point temperature based on the indoor environment temperature and the indoor relative humidity; dynamically adjusting the compressor operating frequency and the inner fan speed according to the environmental dew point temperature and the evaporator surface temperature, so that the evaporator surface temperature is higher than the environmental dew point temperature.

[0006] In some embodiments, determining whether the current environment is in a temperature and humidity state requiring priority dehumidification based on the indoor ambient temperature and the indoor relative humidity comprises: presetting a temperature and humidity determination threshold, the temperature and humidity determination threshold comprising a preset temperature threshold and a preset humidity threshold; determining that the current environment is in a temperature and humidity state requiring priority dehumidification if the indoor ambient temperature is higher than the preset temperature threshold and the indoor relative humidity is higher than the preset humidity threshold; and / or adjusting the compressor frequency and the indoor fan speed to enable the air conditioner to perform dehumidification operation, comprising: controlling the compressor to operate at a preset medium-low frequency range and controlling the indoor fan to operate at a preset medium-low speed range.

[0007] In some embodiments, calculating the environmental dew point temperature based on the indoor ambient temperature and the indoor relative humidity after the dehumidification operation is completed comprises: determining that the dehumidification operation is completed when the indoor relative humidity is reduced to a preset dehumidification target value; and substituting the indoor ambient temperature and the indoor relative humidity into a preset formula to calculate the environmental dew point temperature after the dehumidification operation is completed.

[0008] In some embodiments, dynamically adjusting the compressor frequency and the indoor fan speed based on the environmental dew point temperature and the evaporator surface temperature comprises: recording the difference between the evaporator surface temperature and the environmental dew point temperature as a temperature difference, denoted as a first temperature difference; determining the size of the first temperature difference; reducing the indoor fan speed and increasing the compressor frequency to increase the evaporator surface temperature if the first temperature difference is less than or equal to a preset difference threshold; and maintaining the current compressor frequency and the indoor fan speed unchanged if the first temperature difference is greater than the preset difference threshold.

[0009] In some embodiments, after reducing the indoor fan speed and increasing the compressor frequency, the method further comprises: detecting the indoor tube temperature of the air conditioner, calculating the temperature difference between the evaporator surface temperature and the indoor tube temperature, denoted as a second temperature difference; determining the size of the second temperature difference; and reducing the indoor fan speed or reducing the compressor frequency until the second temperature difference is less than or equal to a preset temperature difference threshold if the second temperature difference is greater than the preset temperature difference threshold.

[0010] In some embodiments, after reducing the indoor fan speed and increasing the compressor frequency, the method further comprises: detecting the supercooling degree, determining the size of the supercooling degree; recalculating the environmental dew point temperature based on the indoor ambient temperature and the indoor relative humidity when the supercooling degree reaches a preset supercooling degree threshold; and dynamically adjusting the compressor frequency and the indoor fan speed based on the recalculated environmental dew point temperature and the evaporator surface temperature.

[0011] According to the method, the application provides a control device for an air conditioner, comprising: an acquisition unit configured to acquire an indoor environment temperature, an indoor relative humidity and an evaporator surface temperature during a cooling operation of the air conditioner; a processing unit configured to determine whether a current environment is in a temperature and humidity state requiring preferential dehumidification according to the indoor environment temperature and the indoor relative humidity; a control unit configured to adjust a compressor frequency and an indoor fan rotating speed to make the air conditioner perform a dehumidification operation if it is determined that the current environment is in the temperature and humidity state requiring preferential dehumidification; the processing unit is further configured to calculate an environment dew point temperature based on the indoor environment temperature and the indoor relative humidity after the dehumidification operation is completed; and the control unit is further configured to dynamically adjust the compressor frequency and the indoor fan rotating speed according to the environment dew point temperature and the evaporator surface temperature to make the evaporator surface temperature higher than the environment dew point temperature.

[0012] In some embodiments, the processing unit determines whether the current environment is in the temperature and humidity state requiring preferential dehumidification according to the indoor environment temperature and the indoor relative humidity, comprising: presetting a temperature and humidity determination threshold, the temperature and humidity determination threshold comprising a preset temperature threshold and a preset humidity threshold; determining that the current environment is in the temperature and humidity state requiring preferential dehumidification if the indoor environment temperature is higher than the preset temperature threshold and the indoor relative humidity is higher than the preset humidity threshold; and / or the control unit adjusts the compressor frequency and the indoor fan rotating speed to make the air conditioner perform the dehumidification operation, comprising: controlling the compressor to operate at a preset medium-low frequency band and controlling the indoor fan to operate at a preset medium-low rotating speed band.

[0013] In some embodiments, the processing unit calculates the environment dew point temperature based on the indoor environment temperature and the indoor relative humidity after the dehumidification operation is completed, comprising: determining that the dehumidification operation is completed when the indoor relative humidity is reduced to a preset dehumidification target value; and substituting the indoor environment temperature and the indoor relative humidity into a preset formula to calculate the environment dew point temperature after the dehumidification operation is completed.

[0014] In some embodiments, the control unit dynamically adjusts the compressor frequency and the indoor fan rotating speed according to the environment dew point temperature and the evaporator surface temperature, comprising: recording a difference between the evaporator surface temperature and the environment dew point temperature as a temperature difference, denoted as a first temperature difference; determining the size of the first temperature difference; reducing the indoor fan rotating speed and increasing the compressor frequency to increase the evaporator surface temperature if the first temperature difference is less than or equal to a preset difference threshold; and maintaining the current compressor frequency and the indoor fan rotating speed unchanged if the first temperature difference is greater than the preset difference threshold.

[0015] In some embodiments, the control unit is further configured to, after reducing the indoor fan rotating speed and increasing the compressor operating frequency, further comprising: detecting the indoor pipe temperature of the air conditioner, calculating the temperature difference between the evaporator surface temperature and the indoor pipe temperature, denoted as a second temperature difference; judging the size of the second temperature difference; if the second temperature difference is greater than a preset temperature difference threshold, reducing the indoor fan rotating speed, or reducing the compressor operating frequency, until the second temperature difference is less than or equal to the preset temperature difference threshold.

[0016] In some embodiments, the control unit is further configured to, after reducing the indoor fan rotating speed and increasing the compressor operating frequency, detecting the supercooling degree of the air conditioner, judging the size of the supercooling degree; when the supercooling degree reaches a preset supercooling degree threshold, re-calculating the environmental dew point temperature based on the indoor environment temperature and the indoor relative humidity, and dynamically adjusting the compressor operating frequency and the indoor fan rotating speed according to the re-calculated environmental dew point temperature and the evaporator surface temperature.

[0017] In order to achieve the above object, the present application provides a control device of an air conditioner, which comprises: a temperature sensor, a humidity sensor, a compressor, an indoor fan, a control unit, and a communication interface.

[0018] In order to achieve the above object, the present application provides a control device of an air conditioner, which comprises: a temperature sensor, a humidity sensor, a compressor, an indoor fan, a control unit, and a communication interface.

[0019] In order to achieve the above object, the present application provides a control device of an air conditioner, which comprises: a temperature sensor, a humidity sensor, a compressor, an indoor fan, a control unit, and a communication interface.

[0020] The scheme of the present application, when the air conditioner is in refrigeration operation, first acquires the indoor temperature and humidity and the evaporator surface temperature, determines whether dehumidification is needed, adjusts the compressor frequency and the indoor fan rotating speed to complete dehumidification if needed, calculates the environmental dew point temperature based on the real-time temperature and humidity after dehumidification, and then dynamically adjusts the compressor frequency and the indoor fan rotating speed to ensure that the evaporator surface temperature is always higher than the dew point temperature. Thus, the anti-condensation response speed is improved, the control accuracy and environmental adaptability are improved, and the balance between efficient dehumidification and stable anti-condensation is achieved.

[0021] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application.

[0022] The technical scheme of the present application will be further described in detail below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 a flowchart of an embodiment of a control method of an air conditioner of the present application; Figure 2 a structural schematic diagram of an embodiment of a control device of an air conditioner of the present application.

[0024] In combination with the drawings, the following are the reference signs in the embodiments of the present application: 101 - acquisition unit; 102 - processing unit; 103 - control unit. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] According to an embodiment of the present application, a control method of an air conditioner is provided, as shown in Figure 1 a flowchart of an embodiment of a method of the present application, the control method of the air conditioner can include steps S110 to S150.

[0027] At step S110, during the refrigeration operation of the air conditioner, the indoor environment temperature, the indoor relative humidity and the evaporator surface temperature are acquired.

[0028] The indoor environment temperature and the relative humidity jointly determine the humidity characteristics and the dew point temperature of the air, and the evaporator surface temperature directly reflects the thermal state of the evaporator. The environment temperature and humidity are acquired by a temperature and humidity sensor. The evaporator surface temperature Ts can be calculated by the air conditioner inlet and outlet air temperatures, Ts = Tout + (Tin - Tout) * K, Tin is the inlet air temperature, Tout is the outlet air temperature, and K is the insulation coefficient, which is determined according to the air conditioner material.

[0029] At step S120, it is determined whether the current environment is in a temperature and humidity state requiring priority dehumidification according to the indoor environment temperature and the indoor relative humidity.

[0030] The prerequisite for condensation is that the water vapor is sufficient and the surface temperature is lower than the dew point. When the indoor temperature is relatively high (so that the air can contain more water vapor) and the humidity is relatively high (the actual water vapor content in the air is close to saturation) at the same time, the water vapor in the air is in a condensation-prone state. At this time, if the temperature is directly lowered, the evaporator surface temperature will quickly drop below the dew point, and the water vapor will condense in large quantities to form condensation. Priority dehumidification can first reduce the total amount of water vapor in the air, so that even if the evaporator surface temperature is lowered subsequently, it is difficult to form obvious condensation due to insufficient water vapor, thereby resolving the risk from the source.

[0031] In some embodiments, in step S120, determining whether the current environment is in a temperature and humidity state requiring priority dehumidification according to the indoor environment temperature and the indoor relative humidity comprises: presetting a temperature and humidity determination threshold, the temperature and humidity determination threshold comprising a preset temperature threshold and a preset humidity threshold; if the indoor environment temperature is higher than the preset temperature threshold and the indoor relative humidity is higher than the preset humidity threshold, it is determined that the current environment is in a temperature and humidity state requiring priority dehumidification.

[0032] The generation of dew risk depends on the synergistic effect of high temperature and high humidity. In a high-temperature environment, air can contain more water vapor, and a high-humidity environment means that the actual water vapor content in the air is close to saturation. When the two are combined, the surface temperature of the air conditioner evaporator is easily reduced to the dew point temperature to cause dewing. Therefore, to determine whether priority dehumidification is required, the conditions of "temperature higher than the preset temperature threshold" and "humidity higher than the preset humidity threshold" must be met. Only when both conditions are met at the same time does it mean that the indoor environment is in a high-risk state of sufficient water vapor and easy condensation, and priority dehumidification operation needs to be started.

[0033] Specifically, the air conditioner preloads the set temperature and humidity determination threshold at the initial stage of refrigeration operation or during continuous operation, and clearly includes the preset temperature threshold (such as 25°C) and the preset humidity threshold (such as 60%RH); real-time collection of actual temperature data and actual relative humidity data of the current indoor environment; comparing the actual temperature data with the preset temperature threshold, and at the same time comparing the actual relative humidity data with the preset humidity threshold; if the actual temperature is higher than the preset temperature threshold and the actual relative humidity is higher than the preset humidity threshold, both conditions are met at the same time, it is determined that the current environment is in a temperature and humidity state requiring priority dehumidification, triggering priority dehumidification operation; if either condition is not met, it is determined that the current environment does not require priority dehumidification, and directly enters the normal refrigeration and anti-condensation control process.

[0034] At step S130, if it is determined that the current environment is in a temperature and humidity state requiring priority dehumidification, the compressor frequency and the indoor fan speed are adjusted, so that the air conditioner performs dehumidification operation.

[0035] The core of dehumidification is to let the water vapor fully condense and be discharged, and water vapor condensation requires sufficient contact time and suitable condensation temperature. Reducing the compressor frequency can control the refrigeration output, avoid excessive reduction of indoor temperature during dehumidification, prevent user discomfort, and at the same time maintain the evaporator surface at a temperature range that is conducive to water vapor condensation but does not cause rapid dewing. Reducing the indoor fan speed can slow down the speed of air flowing through the evaporator, prolong the contact time of air and the evaporator surface, and let the water vapor in the air have enough time to condense on the evaporator surface into liquid water, rather than quickly flowing through without condensation.

[0036] In some embodiments, in step S130, the compressor frequency and the indoor fan rotating speed are adjusted so that the air conditioner performs the dehumidification operation, including: controlling the compressor to operate at a preset medium-low frequency band, and controlling the indoor fan to operate at a preset medium-low rotating speed band.

[0037] The preset medium-low frequency band is lower than the full load operating frequency of the compressor and higher than the minimum stable operating frequency of the compressor. In this frequency band, the condensation temperature condition required for dehumidification can be met, and the indoor temperature will not drop sharply due to excessive refrigerating capacity. The preset medium-low rotating speed band is lower than the rotating speed corresponding to the maximum air volume of the fan and higher than the minimum operating rotating speed of the fan. This rotating speed band can ensure basic air circulation in the room and avoid local overheating during dehumidification.

[0038] The essence of dehumidification is that the water vapor in the air condenses and precipitates on the surface of the low-temperature evaporator. This process requires two core conditions: one is that the surface of the evaporator is maintained at a low temperature that can allow water vapor to condense (but not too low to cause icing), and the other is that the air has sufficient contact time with the surface of the evaporator to ensure that the water vapor is fully condensed. The compressor operating at the preset medium-low frequency band can stably provide moderate refrigerating capacity to maintain the surface of the evaporator at an ideal condensation temperature interval of 10-15°C. The indoor fan operating at the preset medium-low rotating speed band can slow down the air flow speed and prolong the residence time of the air on the surface of the evaporator, allowing the water vapor in the air to have sufficient opportunity to contact the low-temperature evaporator and condense into liquid water. Finally, the liquid water is discharged from the room through the drain pipe, achieving the purpose of reducing the indoor humidity.

[0039] Specifically, after confirming that the current temperature and humidity state needs to be dehumidified in priority, the preset medium-low frequency band parameters (such as 35-45 Hz) of the compressor and the preset medium-low rotating speed band parameters (such as 400-500 rpm) of the indoor fan are extracted; a frequency adjustment instruction is sent to the compressor to gradually reduce the compressor from the initial operating frequency to the preset medium-low frequency band and stabilize the operation, ensuring that the evaporator surface temperature reaches the ideal condensation temperature; a rotating speed adjustment instruction is sent to the indoor fan to gradually reduce the indoor fan from the initial rotating speed to the preset medium-low rotating speed band and stabilize the operation, slowing down the air flow speed; during the dehumidification process, the air conditioner continuously monitors the change of the indoor relative humidity while maintaining the compressor and the indoor fan operating in the preset parameter interval until the indoor relative humidity decreases to the preset dehumidification target value, the dehumidification operation is completed, and then the dew point calculation and anti-condensation adjustment phase is entered.

[0040] At step S140, after the dehumidification operation is completed, the environmental dew point temperature is calculated based on the indoor environmental temperature and the indoor relative humidity.

[0041] In some embodiments, in step S140, after the dehumidification operation is completed, the ambient dew point temperature is calculated based on the indoor ambient temperature and the indoor relative humidity, including: when the indoor relative humidity is reduced to a preset dehumidification target value, it is determined that the dehumidification operation is completed; after the dehumidification operation is completed, the indoor ambient temperature and the indoor relative humidity are substituted into a preset formula to calculate the ambient dew point temperature.

[0042] The preset dehumidification target value is a balanced value set in combination with the dewing risk threshold and the human comfort humidity range. When the value is lower, even if the subsequent air conditioner performs normal refrigeration, the evaporator surface temperature is not easy to reach the dew point temperature. At the same time, the value cannot be too low to avoid problems such as skin dryness and respiratory discomfort caused by excessive dehumidification. By monitoring the indoor relative humidity in real time and comparing it with the value, it can be accurately judged whether the dehumidification reaches the expected effect.

[0043] Specifically, when the actual relative humidity is stably lower than the preset dehumidification target value, it is determined that the dehumidification operation is completed; the air conditioner is switched to normal refrigeration, and the current compressor frequency and fan speed are adjusted. If the user set temperature is low, the compressor operates at high frequency, and if the set temperature is high, the compressor operates at low frequency. After stable operation for 10 minutes, three groups of data of the measured temperature and humidity are continuously collected, and the ambient dew point temperature is calculated accordingly. The formula for calculating the ambient dew point temperature is: T d = U (A + Bt) + C - 19.2, A, B, C are coefficients, T d is the dew point temperature, t is the ambient temperature, and U is the relative humidity.

[0044] At step S150, the compressor operating frequency and the inner fan speed are dynamically adjusted according to the ambient dew point temperature and the evaporator surface temperature, so that the evaporator surface temperature is higher than the ambient dew point temperature.

[0045] The only necessary condition for dewing is that the surface temperature of an object is lower than the ambient dew point temperature. Therefore, as long as the evaporator surface temperature is continuously maintained to be higher than the ambient dew point temperature, dewing can be fundamentally avoided. The indoor ambient temperature and the relative humidity will continuously change during refrigeration (such as temperature and humidity fluctuations caused by user movement, slight leakage of doors and windows, etc.), and the corresponding dew point temperature will also dynamically change. Therefore, the compressor frequency and the inner fan speed must be dynamically adjusted to adapt to these changes in real time. When the evaporator surface temperature approaches the dew point temperature, the parameters are adjusted in time to increase the evaporator surface temperature. When the evaporator surface temperature is much higher than the dew point temperature, the parameters can be appropriately optimized to improve the refrigeration efficiency, achieving the dual balance of anti-condensation and refrigeration effect.

[0046] In some embodiments, in step S150, dynamically adjusting the compressor operating frequency and the inner fan rotating speed according to the ambient dew point temperature and the evaporator surface temperature comprises: recording the difference between the evaporator surface temperature and the ambient dew point temperature as a temperature difference, denoted as a first temperature difference; determining the size of the first temperature difference; if the first temperature difference is less than or equal to a preset difference threshold, reducing the inner fan rotating speed and increasing the compressor operating frequency to increase the evaporator surface temperature; if the first temperature difference is greater than the preset difference threshold, maintaining the current compressor operating frequency and the inner fan rotating speed unchanged.

[0047] Condensation occurs when the evaporator surface temperature is lower than the dew point temperature, so the first temperature difference directly reflects the condensation risk level: when the difference is greater than the preset difference threshold, the evaporator surface temperature is much higher than the dew point temperature, and there is no condensation possibility; when the difference is less than or equal to the preset difference threshold, the evaporator surface temperature is close to or touches the dew point temperature, and the condensation risk increases sharply. Reducing the inner fan rotating speed can reduce the heat exchange between air and the evaporator, directly increasing the evaporator surface temperature; increasing the compressor frequency can increase the refrigerating capacity, promote the condensation of residual water vapor in the air, and further reduce the dew point temperature, so that the first temperature difference is rapidly widened under the double action, solving the condensation problem.

[0048] Specifically, the ambient dew point temperature (e.g., 18°C) is calculated, and the evaporator surface temperature (e.g., 19°C) is collected in real time, and the first temperature difference (1°C) between the two is calculated; comparison shows that the first temperature difference (1°C) is less than or equal to the preset difference threshold (2°C), it is determined that there is a condensation risk at present, and the parameter adjustment instruction is started; a frequency increasing instruction is sent to the compressor to increase the compressor frequency from the current 40 Hz to 45 Hz; a rotating speed reducing instruction is sent to the inner fan to reduce the inner fan rotating speed from 550 rpm to 400 rpm; after adjustment, the evaporator surface temperature and the dew point temperature are collected every 10 seconds, the first temperature difference is calculated, and after 10 seconds, the difference increases to 2.5°C, which exceeds the preset difference threshold, and the condensation risk is eliminated; it is determined that there is no need to continue adjustment, and the compressor and the inner fan are instructed to maintain the current parameters.

[0049] In some embodiments, after reducing the inner fan rotating speed and increasing the compressor operating frequency, further comprising: detecting the inner tube temperature of the air conditioner, calculating the temperature difference between the evaporator surface temperature and the inner tube temperature, denoted as a second temperature difference; determining the size of the second temperature difference; if the second temperature difference is greater than a preset temperature difference threshold, reducing the inner fan rotating speed or reducing the compressor operating frequency until the second temperature difference is less than or equal to the preset temperature difference threshold.

[0050] When the system has a margin of cold, the refrigeration capacity output by the compressor is not fully absorbed by the air, resulting in a large deviation between the internal temperature of the evaporator (the internal tube temperature) and the surface temperature (after heat exchange with the air), i.e., the second temperature difference is greater than the preset temperature difference threshold. At this time, by reducing the fan speed, the contact time between the air and the evaporator can be prolonged, so that the air fully absorbs the cold, and the difference between the surface temperature and the tube temperature is reduced. By reducing the compressor frequency, the refrigeration capacity output can be directly reduced, so that the internal tube temperature rises, and the difference is also reduced. Both methods can consume the cold margin, and ultimately make the temperature difference less than the preset temperature difference threshold, achieving the goal of stabilizing the surface temperature of the evaporator and keeping it always above the ambient dew point temperature.

[0051] Specifically, the internal tube temperature is detected to be 15°C, the evaporator surface temperature is collected to be 19°C, and the AT = 19°C - 15°C = 4°C > 2°C (preset temperature difference threshold) is calculated. It is confirmed that there is a cold margin; combined with the current state (the compressor frequency has just increased, and the cold redundancy mainly comes from high frequency output), the compressor frequency is reduced, and the compressor is reduced from 46Hz to 42Hz; if the cold redundancy comes from the low fan speed, the fan speed is reduced from 380rpm to 320rpm; after adjustment, the internal tube temperature and the evaporator surface temperature are collected every 15 seconds, and the AT is calculated; 20 seconds later, the internal tube temperature rises to 17°C, the evaporator surface temperature remains at 19°C, the AT = 2°C, the adjustment is successful, and the system continues to run according to the user set temperature. At this time, the air conditioner maintains the compressor 42Hz, the internal fan 380rpm (or 320rpm) runs, the first temperature difference still maintains 3°C (anti-condensation standard), the AT = 2°C (cold utilization balance), and the stable refrigeration at 26°C set by the user.

[0052] In some embodiments, after reducing the internal fan speed and increasing the compressor operating frequency, further comprising: detecting the supercooling degree of the air conditioner, judging the size of the supercooling degree; when the supercooling degree reaches the preset supercooling degree threshold, the ambient dew point temperature is recalculated based on the indoor environment temperature and the indoor relative humidity, and the compressor operating frequency and the internal fan speed are dynamically adjusted according to the recalculated ambient dew point temperature and the evaporator surface temperature.

[0053] The supercooling degree is the difference between the liquid refrigerant temperature at the outlet of the condenser and the saturation temperature of the refrigerant under the current condensing pressure, reflecting whether the refrigeration capacity of the refrigeration system is stable and whether the refrigerant circulation is balanced. If the supercooling degree is too low, it means that the refrigerant is not fully liquefied, and the refrigeration capacity is insufficient; if the supercooling degree is too high, it means that the refrigerant is over-liquefied, and the system has redundant cooling capacity, which may cause abnormal fluctuations in the evaporator temperature. When the air conditioner is running normally, the supercooling degree is maintained within a reasonable range, and the refrigerant liquefaction and circulation are balanced; when the supercooling degree reaches a preset threshold (such as 8℃), it means that the condenser is over-cooled or the refrigerant charge is relatively sufficient, resulting in a too low temperature of the liquid refrigerant, which will cause redundant cooling capacity when entering the evaporator, and then cause two problems: one is that the indoor air is over-cooled, and the relative humidity may increase due to the decrease in temperature, causing the ambient dew point temperature to rise; the second is that the surface temperature of the evaporator may again approach the new dew point temperature due to the redundant cooling capacity, and the risk of condensation is repeated. At this time, the environmental state and system state are reviewed, and the adjustment parameters are corrected to ensure the persistence of the anti-condensation effect and the stability of the system operation.

[0054] The present application reduces the total amount of water vapor in the air by accurately determining the temperature and humidity state and preferentially dehumidifying, avoids condensation under the traditional cooling mode, improves the stability of air conditioning operation, and reduces the probability of failure caused by condensation; at the same time, by dynamically adjusting the parameters, it adapts to different changes in temperature and humidity environment, solves the problems of response lag and insufficient precision of traditional fixed parameter control, and balances the refrigeration effect and anti-condensation in low-humidity environment, and balances the dehumidification efficiency and user's sense of feeling in high-humidity environment.

[0055] For example, the air conditioner collects the indoor environment temperature of 31℃, the indoor relative humidity of 72%, and the evaporator surface temperature of 18℃ in real time; the "31℃+72%RH" is compared with the preset "priority dehumidification temperature and humidity threshold value" (assuming "temperature≥25℃ and relative humidity≥60%"), it is determined that the current is in the temperature and humidity state that needs to be dehumidified in priority; the compressor frequency is adjusted to medium-low frequency (such as 40Hz), the inner fan speed is adjusted to medium-low speed (such as 450rpm), and the air conditioner enters the dehumidification priority operation; after 8 minutes of operation, the indoor relative humidity is reduced to 53%, reaching the "target value that does not need to be dehumidified in priority", and the dehumidification operation is completed; after the dehumidification is completed, the indoor environment temperature collected in real time is 28℃, and the relative humidity is 53%; the dew point temperature of the current environment is calculated by substituting into the dew point calculation formula, and is 19℃; at this time, the evaporator surface temperature is 20℃, and the difference between the evaporator surface temperature and the dew point temperature 19℃ is 1℃ (less than the safety threshold value 2℃), the condensation risk is increased; the inner fan speed is reduced (such as to 300rpm), the cold quantity transmission is reduced, and the compressor frequency is adjusted (such as maintained at 40Hz), so that the evaporator surface temperature gradually rises; after 2 minutes, the evaporator surface temperature rises to 22℃, and the difference between the evaporator surface temperature and the dew point temperature 19℃ is 3℃ (higher than the safety threshold value), the condensation risk is removed; in subsequent operation, the indoor environment temperature is reduced to 26℃ due to refrigeration, the relative humidity is stabilized at 50%, the dew point temperature is reduced to 17℃, the evaporator surface temperature is maintained at 21℃, the difference is always greater than the safety threshold value, and the air conditioner is stably operated without condensation phenomenon.

[0056] By adopting the technical scheme of the embodiment, when the air conditioner is operated in refrigeration mode, the indoor temperature and humidity and the evaporator surface temperature are first acquired, it is determined whether priority dehumidification is needed, the compressor frequency and the inner fan speed are adjusted to complete dehumidification if needed, the dew point temperature of the environment is calculated based on the real-time temperature and humidity after dehumidification, and the compressor frequency and the inner fan speed are dynamically adjusted to ensure that the evaporator surface temperature is always higher than the dew point temperature. Therefore, the anti-condensation response speed is improved, the control precision and the environmental adaptability are improved, and the balance between efficient dehumidification and stable anti-condensation is achieved.

[0057] According to the embodiment of the application, a control device of an air conditioner corresponding to a control method of the air conditioner is also provided. Referring to Figure 2 The control device of the air conditioner can include an acquisition unit 101, a processing unit 102, and a control unit 103.

[0058] The acquisition unit 101 is configured to acquire the indoor environment temperature, the indoor relative humidity, and the evaporator surface temperature during the refrigeration operation of the air conditioner. The specific functions and processing of the unit are described in step S110.

[0059] The indoor environment temperature and relative humidity jointly determine the air humidity characteristic and dew point temperature, and the evaporator surface temperature directly reflects the heat state of the evaporator. The environment temperature and humidity are obtained by a temperature and humidity sensor. The evaporator surface temperature Ts can be calculated by the air conditioner inlet and outlet air temperatures, Ts=Tout+(Tin-Tout)*K, Tin is the inlet air temperature, Tout is the outlet air temperature, and K is the insulation coefficient, which is determined according to the air conditioner material.

[0060] The processing unit 102 is configured to determine whether the current environment is in a temperature and humidity state requiring priority dehumidification according to the indoor environment temperature and the indoor relative humidity. The specific functions and processing of this unit are described in step S120.

[0061] The condensation prerequisite is that the water vapor is sufficient and the surface temperature is lower than the dew point. When the indoor temperature is high (so that the air can contain more water vapor) and the humidity is high (the actual water vapor content in the air is close to saturation) at the same time, the water vapor in the air is in a condensation-prone state. At this time, if the temperature is directly reduced, the evaporator surface temperature will quickly drop below the dew point, and the water vapor will condense in large quantities to form condensation. Priority dehumidification can first reduce the total amount of water vapor in the air, so that even if the evaporator surface temperature is reduced later, it is difficult to form obvious condensation due to insufficient water vapor, thereby resolving the risk from the source.

[0062] In some embodiments, the processing unit 102 determines whether the current environment is in a temperature and humidity state requiring priority dehumidification according to the indoor environment temperature and the indoor relative humidity, including: presetting a temperature and humidity judgment threshold, the temperature and humidity judgment threshold including a preset temperature threshold and a preset humidity threshold; if the indoor environment temperature is higher than the preset temperature threshold, and the indoor relative humidity is higher than the preset humidity threshold, it is determined that the current environment is in a temperature and humidity state requiring priority dehumidification.

[0063] The generation of condensation risk depends on the synergistic effect of high temperature and high humidity. In a high-temperature environment, the air can contain more water vapor, and a high-humidity environment means that the actual water vapor content in the air is close to saturation. When the two are combined, once the evaporator surface temperature of the air conditioner is reduced, it is easy to reach the dew point temperature to cause condensation. Therefore, to determine whether priority dehumidification is required, the conditions of “temperature higher than the preset temperature threshold” and “humidity higher than the preset humidity threshold” must be met. Only when both conditions are met, it means that the indoor environment is in a high-risk state of sufficient water vapor and easy condensation, and priority dehumidification operation needs to be started.

[0064] Specifically, the air conditioner pre-loads a set temperature and humidity threshold at the initial stage of refrigeration operation or during continuous operation, which includes a preset temperature threshold (e.g. 25℃) and a preset humidity threshold (e.g. 60%RH); real-time acquisition of actual temperature data and actual relative humidity data of the current indoor environment; comparison of the actual temperature data with the preset temperature threshold, and comparison of the actual relative humidity data with the preset humidity threshold; if the actual temperature is higher than the preset temperature threshold, and the actual relative humidity is higher than the preset humidity threshold, both conditions are met, it is determined that the current environment is in a temperature and humidity state that needs to be dehumidified preferentially, triggering the preferential dehumidification operation; if either condition is not met, it is determined that the current environment does not need to be dehumidified preferentially, and directly enters the conventional refrigeration and condensation control process.

[0065] The control unit 103 is configured to adjust the compressor frequency and the indoor fan speed if it is determined that the current environment is in a temperature and humidity state that needs to be dehumidified preferentially, so that the air conditioner performs dehumidification operation. The specific functions and processes of this unit are described in step S130.

[0066] The core of dehumidification is to let the water vapor condense and discharge fully, and water vapor condensation requires sufficient contact time and suitable condensation temperature. Reducing the compressor frequency can control the refrigeration output, avoid the indoor temperature from being too low during the dehumidification process, prevent the user from feeling uncomfortable, and at the same time maintain the evaporator surface at a temperature range that is conducive to water vapor condensation but not rapid dewing. Reducing the indoor fan speed can slow down the speed of air flowing through the evaporator, prolong the contact time of air and the evaporator surface, so that the water vapor in the air has enough time to condense on the evaporator surface into liquid water, rather than quickly flowing out without condensation.

[0067] In some embodiments, the control unit 103 adjusts the compressor frequency and the indoor fan speed so that the air conditioner performs dehumidification operation, including: controlling the compressor to operate at a preset medium-low frequency band, and controlling the indoor fan to operate at a preset medium-low speed band.

[0068] The preset medium-low frequency band is lower than the full load operating frequency of the compressor and higher than the minimum stable operating frequency of the compressor. In this frequency band, the condensation temperature condition required for dehumidification can be met, and the indoor temperature will not drop sharply due to excessive refrigeration capacity. The preset medium-low speed band is lower than the speed corresponding to the maximum air volume of the fan and higher than the minimum operating speed of the fan. This speed band can ensure basic air circulation in the room and avoid local stuffiness during dehumidification.

[0069] The essence of dehumidification is that the water vapor in the air condenses on the surface of the low-temperature evaporator. This process requires two core conditions: one is that the surface of the evaporator is maintained at a low temperature that allows water vapor to condense (but not too low to cause icing), and the other is that the air has sufficient contact time with the surface of the evaporator to ensure that the water vapor is fully condensed. The compressor preset to operate in the medium and low frequency range can stably provide moderate refrigerating capacity to maintain the evaporator surface at an ideal condensation temperature interval of 10-15°C; the inner fan preset to operate in the medium and low speed range can slow down the air flow speed and prolong the air's residence time on the surface of the evaporator, so that the water vapor in the air has sufficient opportunity to contact the low-temperature evaporator and condense into liquid water, which is finally discharged from the indoor through the drain pipe, achieving the purpose of reducing indoor humidity.

[0070] Specifically, when it is confirmed that the current temperature and humidity state needs to be dehumidified in priority, the preset medium and low frequency range parameters of the compressor (such as 35-45 Hz) and the medium and low speed range parameters of the inner fan (such as 400-500 rpm) are extracted; the frequency adjustment instruction is sent to the compressor to gradually reduce the compressor from the initial operating frequency to the preset medium and low frequency range and operate stably, ensuring that the temperature of the evaporator surface reaches the ideal condensation temperature; the speed adjustment instruction is sent to the inner fan to gradually reduce the inner fan from the initial speed to the preset medium and low speed range and operate stably, slowing down the air flow speed; during the dehumidification process, the air conditioner continuously monitors the change of the indoor relative humidity while maintaining the compressor and the inner fan operating in the preset parameter interval until the indoor relative humidity decreases to the preset dehumidification target value, the dehumidification operation is completed, and then the dew point calculation and anti-condensation adjustment phase is entered.

[0071] The processing unit 102 is also configured to calculate the environmental dew point temperature based on the indoor environment temperature and the indoor relative humidity after the dehumidification operation is completed. The specific functions and processes of this unit are described in step S140.

[0072] In some embodiments, the processing unit 102 calculates the environmental dew point temperature based on the indoor environment temperature and the indoor relative humidity after the dehumidification operation is completed, including: when the indoor relative humidity decreases to the preset dehumidification target value, it is determined that the dehumidification operation is completed; after the dehumidification operation is completed, the indoor environment temperature and the indoor relative humidity are substituted into a preset formula to calculate the environmental dew point temperature.

[0073] The preset dehumidification target value is a balanced value set in combination with the condensation risk threshold and the human comfort humidity range. When the value is lower, even if the air conditioner performs regular refrigeration later, the evaporator surface temperature is not likely to reach the dew point temperature. At the same time, the value is not too low to avoid problems such as dry skin and respiratory discomfort caused by excessive dehumidification. By monitoring the indoor relative humidity in real time and comparing it with the value, it can be accurately judged whether the dehumidification achieves the expected effect.

[0074] Specifically, when the actual relative humidity is stably lower than the preset dehumidification target value, it is determined that the dehumidification operation is completed; the air conditioner is switched to normal refrigeration, and the current compressor frequency and fan speed are adjusted, if the user set temperature is lower, the compressor is operated at high frequency, if the set temperature is higher, the compressor is operated at low frequency, after stable operation for 10 minutes, three groups of data of the measured temperature and humidity are continuously collected, and the ambient dew point temperature is calculated according to the three groups of data. The formula for calculating the ambient dew point temperature is: T d = U (A + Bt) + C - 19.2, A, B, C are coefficients, T d is the dew point temperature, t is the ambient temperature, and U is the relative humidity.

[0075] The control unit 103 is also configured to dynamically adjust the compressor operating frequency and the indoor fan speed according to the ambient dew point temperature and the evaporator surface temperature, so that the evaporator surface temperature is higher than the ambient dew point temperature. The specific functions and processes of this unit are described in step S150.

[0076] The only necessary condition for condensation is that the surface temperature of the object is lower than the ambient dew point temperature, so as long as the evaporator surface temperature is continuously maintained to be higher than the ambient dew point temperature, condensation can be fundamentally avoided; the indoor ambient temperature and the relative humidity will continuously change during refrigeration (such as the fluctuation of the temperature and humidity caused by the user walking, slight leakage of doors and windows, etc.), and the corresponding dew point temperature will also dynamically change, so it is necessary to dynamically adjust the compressor frequency and the indoor fan speed to adapt to these changes in real time. When the evaporator surface temperature approaches the dew point temperature, the parameters are adjusted in time to increase the evaporator surface temperature; when the evaporator surface temperature is much higher than the dew point temperature, the parameters can be appropriately optimized to improve the refrigeration efficiency, so as to realize the double balance of condensation prevention and refrigeration effect.

[0077] In some embodiments, the control unit 103 dynamically adjusts the compressor operating frequency and the indoor fan speed according to the ambient dew point temperature and the evaporator surface temperature, including: recording the difference between the evaporator surface temperature and the ambient dew point temperature as a temperature difference, denoted as a first temperature difference; judging the size of the first temperature difference; if the first temperature difference is less than or equal to a preset difference threshold, the indoor fan speed is reduced and the compressor operating frequency is increased, so that the evaporator surface temperature is increased; if the first temperature difference is greater than the preset difference threshold, the current compressor operating frequency and the indoor fan speed are maintained unchanged.

[0078] Condensation occurs when the evaporator surface temperature is lower than the dew point temperature, so the first temperature difference directly reflects the condensation risk level: when the difference > preset difference threshold, the evaporator surface temperature is much higher than the dew point temperature, and there is no condensation; when the difference ≤ preset difference threshold, the evaporator surface temperature is close to or touches the dew point temperature, and the condensation risk increases sharply. Reducing the internal fan speed can reduce the heat exchange between air and the evaporator, directly increasing the evaporator surface temperature; increasing the compressor frequency can increase the refrigerating capacity, promote the condensation of residual water vapor in the air, further reduce the dew point temperature, and rapidly enlarge the first temperature difference under the double action of the two, to solve the condensation problem.

[0079] Specifically, the ambient dew point temperature is calculated (e.g., 18°C), and the evaporator surface temperature is collected in real time (e.g., 19°C), and the first temperature difference (1°C) between the two is calculated; comparison shows that the first temperature difference (1°C) ≤ preset difference threshold (2°C), it is determined that there is a condensation risk at present, and the parameter adjustment instruction is started; the frequency increase instruction is sent to the compressor, and the compressor frequency is increased from the current 40Hz to 45Hz; the speed reduction instruction is sent to the internal fan, and the internal fan speed is reduced from 550rpm to 400rpm; the evaporator surface temperature and the dew point temperature are collected every 10 seconds after adjustment, the first temperature difference is calculated, and the difference is increased to 2.5°C after 10 seconds, which exceeds the preset difference threshold, and the condensation risk is eliminated; it is determined that there is no need to continue adjustment, and the compressor and the internal fan are maintained at the current parameters.

[0080] In some embodiments, the control unit 103 is also configured to: after reducing the internal fan speed and increasing the compressor operating frequency, detecting the inner tube temperature of the air conditioner, calculating the temperature difference between the evaporator surface temperature and the inner tube temperature, denoted as the second temperature difference; judging the size of the second temperature difference; if the second temperature difference is greater than a preset temperature difference threshold, reducing the internal fan speed, or reducing the compressor operating frequency, until the second temperature difference is less than or equal to the preset temperature difference threshold.

[0081] When the system has a margin of cold, the refrigerating capacity output by the compressor is not fully absorbed by the air, resulting in a large deviation between the evaporator internal refrigerant temperature (inner tube temperature) and the surface temperature (after heat exchange with the air), i.e., the second temperature difference is greater than the preset temperature difference threshold; at this time, by reducing the fan speed, the contact time between air and the evaporator can be prolonged, so that the air can fully absorb the cold, and the difference between the surface temperature and the tube temperature can be reduced; by reducing the compressor frequency, the refrigerating capacity output can be directly reduced, so that the inner tube temperature rises, and the difference is also reduced. Both methods can consume the cold margin, and finally make the temperature difference less than the preset temperature difference threshold, achieving the goal of stabilizing the evaporator surface temperature and keeping it always higher than the ambient dew point temperature.

[0082] Specifically, the inner tube temperature is detected to be 15°C, the evaporator surface temperature is collected to be 19°C, and the calculation AT = 19°C - 15°C = 4°C > 2°C (preset temperature difference threshold) confirms that the cold capacity margin exists; combined with the current state (the compressor frequency just increases, and the cold capacity redundancy mainly comes from the high-frequency output), the compressor frequency is selected to be reduced, and the compressor is reduced from 46Hz to 42Hz; if the cold capacity redundancy comes from the fan speed being too low, the fan speed is selected to be reduced, and the fan speed is reduced from 380rpm to 320rpm; the inner tube temperature and the evaporator surface temperature are collected every 15 seconds after the adjustment, and the AT is calculated; 20 seconds later, the inner tube temperature rises to 17°C, the evaporator surface temperature remains 19°C, the AT = 2°C, the adjustment is successful, the system continues to run according to the user set temperature, at this time the air conditioner maintains the compressor 42Hz, the inner fan 380rpm (or 320rpm) runs, the first temperature difference still remains 3°C (anti-condensation standard), the AT = 2°C (cold capacity utilization balance), and the stable refrigeration is performed at 26°C set by the user.

[0083] In some embodiments, the control unit 103 is further configured to: after reducing the inner fan speed and increasing the compressor operating frequency, detecting the supercooling degree of the air conditioner, judging the size of the supercooling degree; when the supercooling degree reaches a preset supercooling degree threshold, re-calculating the environmental dew point temperature based on the indoor environment temperature and the indoor relative humidity, and dynamically adjusting the compressor operating frequency and the inner fan speed according to the re-calculated environmental dew point temperature and the evaporator surface temperature.

[0084] The supercooling degree is the difference between the liquid refrigerant temperature at the outlet of the condenser and the saturation temperature of the refrigerant under the current condensing pressure, reflecting whether the refrigeration capacity of the refrigeration system is stable and whether the refrigerant circulation is balanced. If the supercooling degree is too low, it means that the refrigerant is not fully liquefied, and the refrigeration capacity is insufficient; if the supercooling degree is too high, it means that the refrigerant is over-liquefied, and the system has excess cold capacity, which may cause abnormal fluctuations in the evaporator temperature. When the air conditioner is running normally, the supercooling degree is maintained in a reasonable range, and the refrigerant liquefaction and circulation are balanced; when the supercooling degree reaches a preset threshold (such as 8°C), it means that the condenser is over-cooled or the refrigerant charge is relatively sufficient, resulting in a too low temperature of the liquid refrigerant, which may cause excess refrigeration capacity when entering the evaporator, and then cause two problems: one is that the indoor air is over-cooled, and the relative humidity may increase due to the temperature drop, causing the environmental dew point temperature to rise; the second is that the evaporator surface temperature may again approach the new dew point temperature due to the excess cold capacity, and the condensation risk may recur. At this time, the environmental state and the system state are reviewed, and the adjustment parameters are corrected to ensure the persistence of the anti-condensation effect and the stability of the system operation.

[0085] Since the processing and functions realized by the device of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, details not described in the description of the present embodiment can be referred to the related description in the foregoing embodiments, which will not be repeated here.

[0086] By employing the technical solution of this invention, during air conditioning cooling operation, the indoor temperature and humidity, as well as the evaporator surface temperature, are first acquired to determine whether dehumidification is required. If so, the compressor frequency and indoor fan speed are adjusted to complete dehumidification. After dehumidification, the ambient dew point temperature is calculated based on real-time temperature and humidity, and the compressor frequency and indoor fan speed are then dynamically adjusted to ensure that the evaporator surface temperature remains above the dew point temperature. This improves the anti-condensation response speed, enhances control accuracy and environmental adaptability, and achieves a balance between efficient dehumidification and stable anti-condensation.

[0087] According to an embodiment of the present invention, an air conditioner corresponding to an air conditioner control device is also provided. This air conditioner may include the air conditioner control device described above.

[0088] Since the processing and functions implemented by the air conditioner in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned device, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0089] By employing the technical solution of this invention, during air conditioning cooling operation, the indoor temperature and humidity, as well as the evaporator surface temperature, are first acquired to determine whether dehumidification is required. If so, the compressor frequency and indoor fan speed are adjusted to complete dehumidification. After dehumidification, the ambient dew point temperature is calculated based on real-time temperature and humidity, and the compressor frequency and indoor fan speed are then dynamically adjusted to ensure that the evaporator surface temperature remains above the dew point temperature. This improves the anti-condensation response speed, enhances control accuracy and environmental adaptability, and achieves a balance between efficient dehumidification and stable anti-condensation.

[0090] According to an embodiment of the present invention, a storage medium corresponding to an air conditioner control method is also provided, the storage medium including a stored program, wherein the program controls the device where the storage medium is located to execute the air conditioner control method described above when it is executed.

[0091] Since the processing and functions implemented by the storage medium in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0092] By employing the technical solution of this invention, during air conditioning cooling operation, the indoor temperature and humidity, as well as the evaporator surface temperature, are first acquired to determine whether dehumidification is required. If so, the compressor frequency and indoor fan speed are adjusted to complete dehumidification. After dehumidification, the ambient dew point temperature is calculated based on real-time temperature and humidity, and the compressor frequency and indoor fan speed are then dynamically adjusted to ensure that the evaporator surface temperature remains above the dew point temperature. This improves the anti-condensation response speed, enhances control accuracy and environmental adaptability, and achieves a balance between efficient dehumidification and stable anti-condensation.

[0093] According to the embodiment of the present application, a computer program product corresponding to the control method of the air conditioner is also provided, which comprises a computer program, and the computer program product is processed to implement the steps of the control method of the air conditioner.

[0094] Since the processing and functions implemented by the computer program product of the embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the embodiment is not described in detail, and the related description in the foregoing embodiments can be referred to, which is not described herein.

[0095] By using the technical solution of the present application, when the air conditioner is in refrigeration operation, the indoor temperature and humidity and the evaporator surface temperature are first acquired to determine whether dehumidification is needed; if needed, the compressor frequency and the indoor fan speed are adjusted to complete dehumidification; after dehumidification, the environmental dew point temperature is calculated based on the real-time temperature and humidity, and the compressor frequency and the indoor fan speed are dynamically adjusted to ensure that the evaporator surface temperature is always higher than the dew point temperature. Thus, the anti-condensation response speed is improved, the control accuracy and environmental adaptability are improved, and the balance between efficient dehumidification and stable anti-condensation is achieved.

[0096] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0097] The above only describes the embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control method of an air conditioner, characterized by, The method comprises: During air conditioning refrigeration operation, obtaining indoor environment temperature, indoor relative humidity and evaporator surface temperature; Determining whether the current environment is in a temperature and humidity state requiring priority dehumidification according to the indoor environment temperature and the indoor relative humidity; If it is determined that the current environment is in a temperature and humidity state requiring priority dehumidification, adjusting the compressor frequency and the indoor fan rotating speed, so that the air conditioner performs dehumidification operation; After the dehumidification operation is completed, calculating the environmental dew point temperature based on the indoor environment temperature and the indoor relative humidity; Dynamically adjusting the compressor operating frequency and the indoor fan rotating speed according to the environmental dew point temperature and the evaporator surface temperature, so that the evaporator surface temperature is higher than the environmental dew point temperature.

2. The control method of the air conditioner according to claim 1, characterized by, Determining whether the current environment is in a temperature and humidity state requiring priority dehumidification according to the indoor environment temperature and the indoor relative humidity comprises: Predefining a temperature and humidity judgment threshold, the temperature and humidity judgment threshold comprising a predefining temperature threshold and a predefining humidity threshold; If the indoor environment temperature is higher than the predefining temperature threshold, and the indoor relative humidity is higher than the predefining humidity threshold, it is determined that the current environment is in a temperature and humidity state requiring priority dehumidification; And / or, Adjusting the compressor frequency and the indoor fan rotating speed, so that the air conditioner performs dehumidification operation, comprises: Controlling the compressor to operate at a predefining medium-low frequency band, and controlling the indoor fan to operate at a predefining medium-low rotating speed band.

3. The control method of the air conditioner according to claim 1, characterized by, After the dehumidification operation is completed, calculating the environmental dew point temperature based on the indoor environment temperature and the indoor relative humidity, comprises: When the indoor relative humidity is reduced to a predefining dehumidification target value, it is determined that the dehumidification operation is completed; After the dehumidification operation is completed, substituting the indoor environment temperature and the indoor relative humidity into a predefining formula to calculate the environmental dew point temperature.

4. The control method of the air conditioner according to claim 1 or 3, characterized by, Dynamically adjusting the compressor operating frequency and the indoor fan rotating speed according to the environmental dew point temperature and the evaporator surface temperature, comprises: Taking the difference between the evaporator surface temperature and the environmental dew point temperature as a temperature difference value, denoted as a first temperature difference value; judging the size of the first temperature difference value; If the first temperature difference value is less than or equal to a predefining difference threshold, reducing the indoor fan rotating speed and increasing the compressor operating frequency, so that the evaporator surface temperature is increased; If the first temperature difference value is greater than the predefining difference threshold, maintaining the current compressor operating frequency and the indoor fan rotating speed unchanged.

5. The control method of the air conditioner according to claim 4, characterized by, After reducing the indoor fan rotating speed and increasing the compressor operating frequency, further comprising: Detecting the indoor tube temperature of the air conditioner, calculating the temperature difference value between the evaporator surface temperature and the indoor tube temperature, denoted as a second temperature difference value; judging the size of the second temperature difference value; If the second temperature difference value is greater than a predefining temperature difference threshold, reducing the indoor fan rotating speed or reducing the compressor operating frequency, until the second temperature difference value is less than or equal to the predefining temperature difference threshold.

6. The control method of the air conditioner according to claim 4 or 5, characterized by, After reducing the indoor fan rotating speed and increasing the compressor operating frequency, further comprising: Detecting the supercooling degree of the air conditioner, judging the size of the supercooling degree; When the supercooling degree reaches a preset supercooling degree threshold, an environmental dew point temperature is recalculated based on the indoor environmental temperature and the indoor relative humidity, and the compressor operating frequency and the indoor fan rotating speed are dynamically adjusted according to the recalculated environmental dew point temperature and the evaporator surface temperature.

7. A control device of an air conditioner, characterized by comprising: The control device comprises: An acquisition unit configured to acquire an indoor environmental temperature, an indoor relative humidity and an evaporator surface temperature during air conditioning refrigeration operation; A processing unit configured to determine whether a current environment is in a temperature and humidity state requiring preferential dehumidification according to the indoor environmental temperature and the indoor relative humidity; A control unit configured to adjust a compressor frequency and an indoor fan rotating speed to make the air conditioner perform dehumidification operation if it is determined that the current environment is in the temperature and humidity state requiring preferential dehumidification; The processing unit is further configured to calculate an environmental dew point temperature based on the indoor environmental temperature and the indoor relative humidity after the dehumidification operation is completed; The control unit is further configured to dynamically adjust the compressor operating frequency and the indoor fan rotating speed according to the environmental dew point temperature and the evaporator surface temperature, so that the evaporator surface temperature is higher than the environmental dew point temperature.

8. An air conditioner characterized by comprising: The control device of the air conditioner according to claim 7. The storage medium comprises a stored program, wherein the program controls a device where the storage medium is located to perform the control method of the air conditioner according to any one of claims 1 to 6 when the program is executed.

9. A storage medium, characterized by The computer program is executed by a processor to implement the steps of the control method of the air conditioner according to any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that, ​

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