Air conditioner control method and device, air conditioner, storage medium and program product

Abstract

The invention discloses an air conditioner control method and device, an air conditioner, a storage medium and a computer program product. The air conditioner comprises an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger and an outdoor heat exchanger. The outdoor heat exchanger is connected with the indoor second heat exchanger through the outdoor electronic expansion valve, the indoor first heat exchanger and the indoor electronic expansion valve in sequence; the method comprises the steps that after a constant-temperature dehumidification mode is started, whether dehumidification is started or not is determined according to indoor humidity, indoor target humidity and outdoor temperature; if it is determined that dehumidification is started, the opening degree of an outdoor electronic expansion valve is set to be maximum, the rotating speed of an inner fan is controlled according to the indoor humidity and the indoor target humidity, the rotating speed of an outer fan is controlled according to the indoor temperature, the frequency of a compressor is controlled according to the indoor humidity and the indoor target humidity, and the opening degree of the indoor electronic expansion valve is controlled according to the exhaust temperature. According to the scheme, the room temperature is kept unchanged during dehumidification, the indoor temperature is prevented from being cold but not dry, and the indoor comfort in the dehumidification process is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and specifically relates to a control method, device, air conditioner, storage medium and computer program product of an air conditioner, and in particular to a constant temperature and dehumidification control method, device, air conditioner, storage medium and computer program product of an air conditioner. Background Art

[0002] During the transitional season (when temperatures are relatively comfortable and relative humidity is high), when variable-frequency air conditioners are used for cooling and dehumidification, the indoor return air temperature and dew point gradually decrease. Once the relative humidity reaches a certain level, it no longer decreases and may even increase, resulting in a cold but not dry indoor environment and poor comfort. Furthermore, to ensure effective dehumidification, the lower return air dew point also reduces the evaporation temperature, reducing the air conditioner's dehumidification capacity per unit energy consumption and leading to lower operating efficiency.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0004] The object of the present invention is to provide an air conditioner control method, device, air conditioner, storage medium and computer program product to solve the problem in related schemes that the indoor temperature is cold but not dry and the dehumidification capacity per unit energy consumption is reduced when the air conditioner is cooling and dehumidifying in a high humidity environment, resulting in poor indoor comfort and low air conditioner operation energy efficiency. The purpose is to achieve the effect of maintaining the indoor temperature unchanged during the dehumidification process by arranging a first heat exchanger, a second heat exchanger and an indoor electronic expansion valve indoors, and controlling the internal fan speed, external fan speed, compressor frequency and indoor electronic expansion valve opening according to operating parameters during dehumidification, thereby improving the dehumidification efficiency and operation energy efficiency, avoiding the indoor temperature being cold but not dry, and improving the indoor comfort during the dehumidification process.

[0005] The present invention provides a control method for an air conditioner, wherein the air conditioner comprises an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor; the outdoor heat exchanger is sequentially connected to the outdoor electronic expansion valve, the first indoor heat exchanger, the indoor electronic expansion valve, and the second indoor heat exchanger; the air conditioner has a constant temperature dehumidification mode; the constant temperature dehumidification mode can dehumidify the room without changing the indoor ambient temperature; the method comprises: after the air conditioner turns on the constant temperature dehumidification mode, obtaining indoor relative humidity, indoor target relative humidity, and indoor relative humidity. Humidity, outdoor ambient temperature, indoor ambient temperature, and exhaust temperature of the compressor; determine whether to start dehumidification based on the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature; if it is determined to start dehumidification, set the opening of the outdoor electronic expansion valve to the maximum, control the speed of the indoor fan according to the indoor relative humidity and the indoor target relative humidity, control the speed of the outdoor fan according to the indoor ambient temperature, control the frequency of the compressor according to the indoor relative humidity and the indoor target relative humidity, and control the opening of the indoor electronic expansion valve according to the exhaust temperature.

[0006] In some embodiments, whether to start dehumidification is determined based on the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature, including: judging the relationship between the indoor relative humidity and the indoor target relative humidity, and the size of the outdoor ambient temperature; if the indoor relative humidity is greater than or equal to the indoor target relative humidity, and the outdoor ambient temperature is greater than or equal to the preset outdoor temperature, determining to start dehumidification; if the indoor relative humidity is less than the indoor target relative humidity, or the outdoor ambient temperature is less than the preset outdoor temperature, determining not to perform dehumidification.

[0007] In some embodiments, the speed of the indoor fan is controlled according to the indoor relative humidity and the indoor target relative humidity, including: turning on the indoor fan and running it at an initial speed; recording the difference between the indoor relative humidity and the indoor target relative humidity as a humidity difference, and judging the size of the humidity difference; if the humidity difference is greater than a preset humidity difference, controlling the speed of the indoor fan to a high speed; if the humidity difference is less than or equal to the preset humidity difference, obtaining the return air dew point temperature and the pipe temperature of the indoor second heat exchanger, recording the difference between the return air dew point temperature and the pipe temperature of the indoor second heat exchanger as a temperature difference, and judging the size of the temperature difference; if the temperature difference is greater than a preset first temperature difference, increasing the speed of the indoor fan; if the temperature difference is less than a preset second temperature difference, reducing the speed of the indoor fan; if the temperature difference is less than or equal to the preset first temperature difference and greater than or equal to the preset second temperature difference, keeping the speed of the indoor fan unchanged.

[0008] In some embodiments, the speed of the external fan is controlled according to the indoor ambient temperature, including: turning on the external fan and running it at an initial speed; recording the indoor ambient temperature when the air conditioner turns on the constant temperature dehumidification mode as the set temperature; calculating the change in the difference between the indoor ambient temperature and the set temperature, and recording it as the temperature difference change; calculating the speed adjustment amount of the external fan according to the difference between the indoor ambient temperature and the set temperature, the temperature difference change and a preset first feedback control algorithm; controlling the speed of the external fan to be the sum of the current speed and the speed adjustment amount.

[0009] In some embodiments, controlling the frequency of the compressor according to the indoor relative humidity and the indoor target relative humidity includes: turning on the compressor and running it at an initial frequency; recording the difference between the indoor relative humidity and the indoor target relative humidity as a humidity difference, and calculating a change in the humidity difference; calculating a frequency adjustment amount of the compressor according to the humidity difference, the change in the humidity difference, and a preset second feedback control algorithm; and controlling the frequency of the compressor to be the sum of a current frequency and the frequency adjustment amount.

[0010] In some embodiments, controlling the opening of the indoor electronic expansion valve according to the exhaust temperature includes: controlling the opening of the indoor electronic expansion valve to an initial opening; calculating a change in the difference between the exhaust temperature and a preset target exhaust temperature, recorded as an exhaust temperature difference change; calculating an opening adjustment amount of the indoor electronic expansion valve according to the difference between the exhaust temperature and the preset target exhaust temperature, the exhaust temperature difference change and a preset third feedback control algorithm; and controlling the opening of the indoor electronic expansion valve to be the sum of a current opening and the opening adjustment amount.

[0011] Matching the above method, the present invention provides a control device for an air conditioner on the other hand, the air conditioner includes an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor; the outdoor heat exchanger is connected to the second indoor heat exchanger after passing through the outdoor electronic expansion valve, the first indoor heat exchanger, and the indoor electronic expansion valve in sequence; the air conditioner has a constant temperature dehumidification mode; the constant temperature dehumidification mode can dehumidify the room without changing the indoor ambient temperature; the device includes: an acquisition unit, which is configured to obtain indoor relative humidity, indoor target humidity, and indoor relative humidity after the air conditioner turns on the constant temperature dehumidification mode. target relative humidity, outdoor ambient temperature, indoor ambient temperature, and exhaust temperature of the compressor; a control unit is configured to determine whether to start dehumidification based on the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature; the control unit is further configured to set the opening of the outdoor electronic expansion valve to the maximum if it is determined to start dehumidification, control the speed of the indoor fan according to the indoor relative humidity and the indoor target relative humidity, control the speed of the outdoor fan according to the indoor ambient temperature, control the frequency of the compressor according to the indoor relative humidity and the indoor target relative humidity, and control the opening of the indoor electronic expansion valve according to the exhaust temperature.

[0012] In some embodiments, the control unit determines whether to start dehumidification based on the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature, including: judging the relationship between the indoor relative humidity and the indoor target relative humidity, and the size of the outdoor ambient temperature; if the indoor relative humidity is greater than or equal to the indoor target relative humidity, and the outdoor ambient temperature is greater than or equal to the preset outdoor temperature, determining to start dehumidification; if the indoor relative humidity is less than the indoor target relative humidity, or the outdoor ambient temperature is less than the preset outdoor temperature, determining not to start dehumidification.

[0013] In some embodiments, the control unit controls the speed of the indoor fan according to the indoor relative humidity and the indoor target relative humidity, including: turning on the indoor fan and running it at an initial speed; recording the difference between the indoor relative humidity and the indoor target relative humidity as a humidity difference, and judging the size of the humidity difference; if the humidity difference is greater than a preset humidity difference, controlling the speed of the indoor fan to a high speed; if the humidity difference is less than or equal to the preset humidity difference, obtaining the return air dew point temperature and the pipe temperature of the indoor second heat exchanger, recording the difference between the return air dew point temperature and the pipe temperature of the indoor second heat exchanger as a temperature difference, and judging the size of the temperature difference; if the temperature difference is greater than a preset first temperature difference, increasing the speed of the indoor fan; if the temperature difference is less than a preset second temperature difference, reducing the speed of the indoor fan; if the temperature difference is less than or equal to the preset first temperature difference and greater than or equal to the preset second temperature difference, keeping the speed of the indoor fan unchanged.

[0014] In some embodiments, the control unit controls the speed of the outdoor fan according to the indoor ambient temperature, including: turning on the outdoor fan and running it at an initial speed; recording the indoor ambient temperature when the air conditioner turns on the constant temperature dehumidification mode as the set temperature; calculating the change in the difference between the indoor ambient temperature and the set temperature, and recording it as the temperature difference change; calculating the speed adjustment amount of the outdoor fan according to the difference between the indoor ambient temperature and the set temperature, the temperature difference change and a preset first feedback control algorithm; controlling the speed of the outdoor fan to be the sum of the current speed and the speed adjustment amount.

[0015] In some embodiments, the control unit controls the frequency of the compressor according to the indoor relative humidity and the indoor target relative humidity, including: turning on the compressor and running it at an initial frequency; recording the difference between the indoor relative humidity and the indoor target relative humidity as a humidity difference, and calculating a change in the humidity difference; calculating a frequency adjustment amount of the compressor according to the humidity difference, the change in the humidity difference, and a preset second feedback control algorithm; and controlling the frequency of the compressor to be the sum of a current frequency and the frequency adjustment amount.

[0016] In some embodiments, the control unit controls the opening of the indoor electronic expansion valve according to the exhaust temperature, including: controlling the opening of the indoor electronic expansion valve to an initial opening; calculating the change in the difference between the exhaust temperature and a preset target exhaust temperature, recorded as the exhaust temperature difference change; calculating the opening adjustment amount of the indoor electronic expansion valve according to the difference between the exhaust temperature and the preset target exhaust temperature, the exhaust temperature difference change and a preset third feedback control algorithm; controlling the opening of the indoor electronic expansion valve to be the sum of the current opening and the opening adjustment amount.

[0017] Matching the above device, the present invention further provides an air conditioner, comprising: the control device of the air conditioner described above.

[0018] In accordance with the above method, the present invention further provides a storage medium, which includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned air conditioning control method.

[0019] In accordance with the above method, the present invention further provides a computer program product, which includes a computer program. When the computer program product is processed and executed, the steps of the above air conditioner control method are implemented.

[0020] The air conditioner of the present invention includes an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor. The outdoor heat exchanger passes through the outdoor electronic expansion valve, the first indoor heat exchanger, and the indoor electronic expansion valve in sequence before being connected to the second indoor heat exchanger. After the air conditioner is in constant temperature dehumidification mode, it determines whether to start dehumidification based on the indoor relative humidity, the target indoor relative humidity, and the outdoor ambient temperature. If dehumidification is determined to start, the opening of the outdoor electronic expansion valve is set to maximum, the speed of the indoor fan is controlled based on the indoor relative humidity and the target indoor relative humidity, the speed of the outdoor fan is controlled based on the indoor ambient temperature, the frequency of the compressor is controlled based on the indoor relative humidity and the target indoor relative humidity, and the opening of the indoor electronic expansion valve is controlled based on the exhaust temperature. This maintains the indoor temperature constant during the dehumidification process, thereby improving dehumidification efficiency and operating energy efficiency, while also preventing the indoor room from being too cold and dry, and enhancing indoor comfort during the dehumidification process.

[0021] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A flow chart of an embodiment of a method for controlling an air conditioner according to the present invention;

[0024] Figure 2 A schematic structural diagram of an embodiment of an air conditioner control device of the present invention;

[0025] Figure 3 A schematic diagram of the system structure of an air conditioner according to the present invention;

[0026] Figure 4 It is a flow chart of the constant temperature dehumidification mode of the present invention.

[0027] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0028] 1-compressor; 2-four-way reversing valve; 3-outdoor heat exchanger; 41-outdoor electronic expansion valve; 42-indoor electronic expansion valve; 51-first indoor heat exchanger; 52-second indoor heat exchanger; 61-first indoor pipe temperature sensing package; 62-outdoor pipe temperature sensing package; 63-exhaust temperature sensing package; 64-second indoor pipe temperature sensing package; 102-acquisition unit; 104-control unit. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] According to an embodiment of the present invention, a control method for an air conditioner is provided, wherein the air conditioner includes an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor; the outdoor heat exchanger is connected to the second indoor heat exchanger after passing through the outdoor electronic expansion valve, the first indoor heat exchanger, and the indoor electronic expansion valve in sequence.

[0031] The specific structure of the air conditioner is as follows Figure 3 As shown, the system includes: a compressor 1, a four-way reversing valve 2, an outdoor heat exchanger 3, an outdoor electronic expansion valve 41, an indoor electronic expansion valve 42, a first indoor heat exchanger 51, and a second indoor heat exchanger 52. The S and D ends of the four-way reversing valve 2 are connected to the intake and exhaust ports of the compressor 1, respectively, while the E and C ends are connected to the second indoor heat exchanger 52 and the outdoor heat exchanger 3, respectively. The outdoor heat exchanger 3 passes through the outdoor electronic expansion valve 41, the first indoor heat exchanger 51, and the indoor electronic expansion valve 42, before connecting to the second indoor heat exchanger 52. The first indoor pipe temperature sensor 61 is used to measure the pipe temperature of the second indoor heat exchanger 52, the outdoor pipe temperature sensor 62 is used to measure the pipe temperature of the outdoor heat exchanger 3, the exhaust temperature sensor 63 is used to measure the exhaust temperature of the compressor 1, and the second indoor temperature sensor 64 is used to measure the pipe temperature of the first indoor heat exchanger 51. The first and second indoor heat exchangers share a common indoor fan.

[0032] The air conditioner has a constant temperature dehumidification mode; the constant temperature dehumidification mode can dehumidify the room without changing the indoor ambient temperature.

[0033] In constant temperature dehumidification mode, the D and C terminals of four-way reversing valve 2 are connected, and the E and S terminals are connected. The refrigerant flows from compressor 1 to outdoor heat exchanger 3, outdoor electronic expansion valve 41, indoor first heat exchanger 51, indoor electronic expansion valve 42, indoor second heat exchanger 52, and compressor 1. The indoor first heat exchanger acts as a condenser, heating the indoor return air passing through it, while the indoor second heat exchanger cools and dehumidifies the indoor return air. The two airflows mix in the indoor unit air duct, reaching a temperature close to that of the return air and with a lower moisture content, before being returned to the room. In this mode, the indoor electronic expansion valve acts as a throttling and pressure-reducing device. Adjusting the outdoor fan speed adjusts the ratio of heat exchange between the outdoor heat exchanger and the indoor first heat exchanger, thereby regulating the supply air temperature.

[0034] like Figure 1 FIG. 1 is a flow chart of an embodiment of the method of the present invention. The air conditioner control method may include steps S110 to S130.

[0035] In step S110 , after the air conditioner turns on the constant temperature dehumidification mode, the indoor relative humidity, the indoor target relative humidity, the outdoor ambient temperature, the indoor ambient temperature, and the exhaust temperature of the compressor are obtained.

[0036] When the user activates constant temperature dehumidification mode, the indoor unit receives the user-set target relative humidity via the remote control and simultaneously monitors the indoor relative humidity and the ambient temperature. To improve the accuracy of indoor temperature and humidity detection, the indoor fan can be turned on to circulate indoor air into the indoor unit, allowing the sensor to accurately collect the indoor air temperature and humidity.

[0037] In step S120 , it is determined whether to start dehumidification according to the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature.

[0038] After turning on the constant temperature dehumidification mode, the system will first determine whether the current indoor environment needs to be dehumidified and whether it meets the operating conditions for constant temperature dehumidification. Only when both are met at the same time can the subsequent compressor start-up, fan adjustment, expansion valve control and other operations be effective and safe, avoiding invalid operation or system abnormalities.

[0039] In some embodiments, in step S120, the specific process of determining whether to start dehumidification based on the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature includes: judging the relationship between the indoor relative humidity and the indoor target relative humidity, and the size of the outdoor ambient temperature; if the indoor relative humidity is greater than or equal to the indoor target relative humidity, and the outdoor ambient temperature is greater than or equal to the preset outdoor temperature, determining to start dehumidification; if the indoor relative humidity is less than the indoor target relative humidity, or the outdoor ambient temperature is less than the preset outdoor temperature, determining not to perform dehumidification, and re-determining whether to start dehumidification based on the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature.

[0040] If the indoor relative humidity is greater than or equal to the target relative humidity, it means that the current humidity is higher than the target value and dehumidification is required. If the indoor relative humidity is lower than the target value, dehumidification is not required and no subsequent control is performed.

[0041] The preset outdoor temperature is the lowest outdoor temperature at which constant temperature dehumidification mode can operate, typically ranging from 10°C to 16°C, with 14°C to 16°C being preferred. If the outdoor temperature is lower than the preset outdoor temperature, it indicates that the outdoor temperature is too low and a suitable pressure differential may not be established. Therefore, constant temperature dehumidification control is only performed when the outdoor temperature is higher than or equal to the preset outdoor temperature.

[0042] By using indoor humidity and outdoor temperature as the start-up judgment conditions of the constant temperature dehumidification mode, indoor humidity is the demand trigger condition and outdoor temperature is the environmental constraint condition, the accuracy of constant temperature dehumidification control is improved and system operation or system abnormalities are avoided.

[0043] At step S130, if it is determined to start dehumidification, the opening of the outdoor electronic expansion valve is set to the maximum, the speed of the indoor fan is controlled according to the indoor relative humidity and the indoor target relative humidity, the speed of the outdoor fan is controlled according to the indoor ambient temperature, the frequency of the compressor is controlled according to the indoor relative humidity and the indoor target relative humidity, and the opening of the indoor electronic expansion valve is controlled according to the exhaust temperature.

[0044] Indoor relative humidity is related to temperature and moisture content. At the same temperature, the lower the moisture content, the lower the relative humidity. At the same moisture content, the lower the temperature, the higher the relative humidity. While cooling and dehumidification reduce both temperature and moisture content, relative humidity doesn't necessarily decrease, resulting in a cold, but not dry, indoor environment. Constant-temperature dehumidification, on the other hand, maintains a constant indoor temperature. By reducing moisture content, relative humidity will inevitably decrease. When constant-temperature dehumidification begins, the outdoor electronic expansion valve is fully opened. The refrigerant pressure is throttled and reduced by adjusting the opening of the indoor electronic expansion valve. The indoor and outdoor fans and compressor are then turned on, and the system begins operation. The fan speeds, compressor frequency, and indoor electronic expansion valve opening are then adjusted based on the system's real-time operating parameters to achieve dehumidification without cooling the room. This prevents a cold, but not dry, indoor environment and improves comfort during dehumidification.

[0045] In some embodiments, in step S130, the specific process of controlling the speed of the indoor fan according to the indoor relative humidity and the indoor target relative humidity includes: turning on the indoor fan and running it at an initial speed; recording the difference between the indoor relative humidity and the indoor target relative humidity as a humidity difference, and judging the size of the humidity difference; if the humidity difference is greater than a preset humidity difference, controlling the speed of the indoor fan to a high speed; if the humidity difference is less than or equal to the preset humidity difference, obtaining the return air dew point temperature and the pipe temperature of the indoor second heat exchanger, recording the difference between the return air dew point temperature and the pipe temperature of the indoor second heat exchanger as a temperature difference, and judging the size of the temperature difference; if the temperature difference is greater than a preset first temperature difference, increasing the speed of the indoor fan; if the temperature difference is less than a preset second temperature difference, reducing the speed of the indoor fan; if the temperature difference is less than or equal to the preset first temperature difference and greater than or equal to the preset second temperature difference, keeping the speed of the indoor fan unchanged.

[0046] The internal fan speed control is divided into rapid dehumidification and high-efficiency dehumidification stages. When the humidity difference is greater than the preset humidity difference, rapid dehumidification is required. At this time, the internal fan runs at a high speed or high wind speed to achieve the purpose of rapid dehumidification. The preset humidity difference is 5% to 20%, preferably 10% to 15%.

[0047] When the humidity difference is less than or equal to the preset humidity difference, high-efficiency dehumidification is performed. The system controls the speed of the internal fan according to the difference between the return air dew point temperature and the temperature of the second indoor heat exchanger tube. The return air dew point temperature can be calculated based on the atmospheric pressure in the user's area, that is, the return air dew point temperature T 露点 =f(B, T 回风 , RH 回风 ), B is atmospheric pressure, T 回风 is the return air temperature, RH 回风 Return air humidity.

[0048] During efficient dehumidification, the fan speed is adjusted to keep the difference between the return air dew point and the temperature of the second indoor heat exchanger tube within the target range, i.e., the preset second temperature difference ≤ the preset temperature difference ≤ the preset first temperature. If the temperature difference exceeds the preset first difference, the temperature of the second indoor heat exchanger tube is too low. The fan speed can be increased to increase the air flow through the evaporator and improve dehumidification. If the temperature difference is less than the preset second difference, the temperature of the second indoor heat exchanger tube is too high. The fan speed can be reduced to reduce the air flow and lower the temperature. By dynamically matching the return air dew point with the evaporator tube temperature, energy efficiency is optimized.

[0049] In some embodiments, the first temperature difference is preset to ΔT opt +ΔT1, the second temperature difference is preset to ΔT opt -ΔT1, ΔT opt The value is between 3 and 5℃, and the value of △T1 is between 0 and 1℃. opt +ΔT1), then in the next adjustment cycle, the speed of the internal fan is increased by K fan_n ·(△T Fan_n -△T opt ); When the temperature difference is less than (ΔT opt -ΔT1), then in the next adjustment cycle, the speed of the internal fan is reduced by K fan_n_1 ·(△T opt -△T Fan_n ). Among them, K fan_n , K fan_n_1 is the adjustment coefficient, △T Fan_n is the temperature difference in the current adjustment cycle.

[0050] In some embodiments, in step S130, the specific process of controlling the speed of the outdoor fan according to the indoor ambient temperature includes: turning on the outdoor fan and running it at an initial speed; recording the indoor ambient temperature when the air conditioner turns on the constant temperature dehumidification mode as the set temperature; calculating the change in the difference between the indoor ambient temperature and the set temperature, and recording it as the temperature difference change; calculating the speed adjustment amount of the outdoor fan according to the difference between the indoor ambient temperature and the set temperature, the temperature difference change and a preset first feedback control algorithm; and controlling the speed of the outdoor fan to be the sum of the current speed and the speed adjustment amount.

[0051] The speed of the outdoor fan is controlled by PI based on the indoor temperature, with an adjustment cycle of 2 to 10 minutes, preferably 3 to 5 minutes. In order to keep the indoor temperature constant during the dehumidification process, the indoor temperature at the initial dehumidification moment is used as the set temperature. By controlling the speed of the outdoor fan, the heat exchange of the outdoor condenser is changed, and then the heating amount of the indoor first heat exchanger to the indoor air is adjusted, and the indoor air outlet temperature is adjusted to keep the indoor temperature constant. The temperature difference change σTn Is the average temperature difference △T in the current adjustment period n The average temperature difference △T from the previous adjustment cycle n-1 The difference, σT n =△T n -△T n-1 The first feedback control algorithm is preset as △Fan _w_n =Kp _Fan_w ·△T n +Ki _Fan ·σT n , is the speed adjustment of the external fan, Kp _Fan_w 、Ki _Fan is the speed adjustment coefficient of the external fan. Then the speed of the external fan in the next cycle is Fan _w_(n+1) =Fan _w_n +△Fan _w_n , Fan _w_n The external fan speed in the current adjustment cycle.

[0052] Through the temperature difference dynamic adjustment mechanism based on indoor temperature changes and PI algorithm, the indoor temperature is ensured to remain unchanged during the dehumidification process, achieving the effect of constant temperature dehumidification.

[0053] In some embodiments, in step S130, the specific process of controlling the frequency of the compressor according to the indoor relative humidity and the indoor target relative humidity includes: starting the compressor and running it at an initial frequency; recording the difference between the indoor relative humidity and the indoor target relative humidity as a humidity difference, and calculating a change in the humidity difference; calculating a frequency adjustment amount of the compressor according to the humidity difference, the change in the humidity difference, and a preset second feedback control algorithm; and controlling the frequency of the compressor to be the sum of the current frequency and the frequency adjustment amount.

[0054] Initial frequency of the compressor Fr _a The humidity difference △RH and indoor temperature T 回风 Determine, that is, Fr _a =f(ΔRH, T 回风 After determining the initial frequency, the system will also determine the size of the initial frequency and the oil return frequency. If the initial frequency ≥ the oil return frequency, the compressor will operate according to the initial frequency. If the initial frequency < the oil return frequency, the compressor will operate according to the oil return frequency.

[0055] The compressor frequency determines the refrigerant flow rate and dehumidification capacity. The higher the compressor frequency, the greater the dehumidification capacity. Therefore, according to the change of the indoor humidity difference, the compressor frequency is dynamically adjusted to match the dehumidification capacity with the current ambient humidity, avoiding problems such as poor dehumidification effect or excessive dehumidification. The adjustment cycle of the compressor frequency can be set to 2 to 6 minutes, preferably 3 to 5 minutes. The change in humidity difference σRHn Is the humidity difference △RH in the current adjustment cycle n Humidity difference △RH from the previous adjustment cycle n-1 The difference, σRH n =△RH n -△RH n-1 The second feedback control algorithm is preset as △Fr n =Kp _comp △RH n +Ki _comp ·σRH n , △Fr n Kp is the frequency adjustment of the compressor _comp 、Ki _comp is the compressor frequency adjustment coefficient. Then the compressor frequency Fr of the next cycle is (n+1) =Fr n +△Fr n , Fr n The compressor frequency of the current regulation cycle.

[0056] By controlling the compressor frequency based on indoor humidity fluctuations and the PI algorithm, the compressor frequency dynamically adjusts to actual humidity demand. For example, when indoor humidity drops rapidly, the frequency adjustment amplitude is automatically reduced to avoid excessive dehumidification caused by high-frequency operation. This ensures dehumidification effectiveness while achieving a balance between energy efficiency and dehumidification comfort.

[0057] In some embodiments, in step S130, the specific process of controlling the opening of the indoor electronic expansion valve according to the exhaust temperature includes: controlling the opening of the indoor electronic expansion valve to an initial opening; calculating the change in the difference between the exhaust temperature and a preset target exhaust temperature, recorded as the exhaust temperature difference change; calculating the opening adjustment amount of the indoor electronic expansion valve according to the difference between the exhaust temperature and the preset target exhaust temperature, the exhaust temperature difference change and a preset third feedback control algorithm; and controlling the opening of the indoor electronic expansion valve to be the sum of the current opening and the opening adjustment amount.

[0058] The initial opening of the indoor electronic expansion valve corresponds to the initial frequency of the compressor, and then the exhaust temperature T_ 排气 and target exhaust temperature T_ 目标排气 The difference △T dis =T_ 排气 -T_ 目标排气 The adjustment cycle of the indoor electronic expansion valve is the same as that of the compressor. 目标排气 The compressor frequency Fr, outdoor heat exchanger tube temperature T_ 冷凝管温 , Indoor second heat exchanger tube temperature T_ 蒸发管温 Experimental fitting is performed to obtain, for example, T_目标排气 =a*Fr+b*T_ 冷凝管温 +c*T_ 蒸发管温 +d, where a, b, c, and d are constants. Exhaust temperature change σT _dis_n Is the average value of the exhaust temperature difference △T during the current adjustment cycle _dis_n Average value of exhaust temperature difference △T from the previous adjustment cycle _dis_(n-1) The difference, σT _dis_n =△T _dis_n -△T _dis_(n-1) The third feedback control algorithm is preset as △B _n =Kp _EEV_n ·△T _dis_n +Ki _EEV_n ·σT _dis_n , △B _n is the opening adjustment amount, Kp _EEV_n 、Ki _EEV_n is the opening adjustment coefficient. Then the opening of the indoor electronic expansion valve in the next cycle is B _(n+1) =B _n +△B _n , B _n It is the opening degree of the indoor electronic expansion valve in the current adjustment cycle.

[0059] It should be noted that in the constant temperature dehumidification mode, when the outdoor fan stops or the speed is lower than a certain level, the refrigerant at the outdoor pipe temperature sensor 62 is in an overheated state, and the temperature T_ 再热管温 Replace outdoor pipe temperature T_ 冷凝管温 Calculate the target exhaust temperature.

[0060] Exhaust temperature can reflect whether the current refrigerant flow is appropriate. Excessively high exhaust temperature may indicate insufficient refrigerant flow (expansion valve opening too small), leading to compressor overheating. Excessively low exhaust temperature may indicate excessive refrigerant flow (expansion valve opening too large), leading to the risk of liquid hammer. Therefore, by controlling the opening of the indoor electronic expansion valve based on the exhaust temperature, the refrigerant flow is adjusted to maintain the exhaust temperature within the appropriate range, thereby improving the safety and efficiency of air conditioning operation.

[0061] Figure 4 It is a flow chart of the constant temperature dehumidification mode of the present invention, as shown in FIG. Figure 4 As shown, the method includes:

[0062] Step 1: After the air conditioner turns on the constant temperature dehumidification mode, obtain the target relative humidity RH set by the user 设定 , the indoor fan is turned on at the initial wind speed Fan_n_a, and the initial indoor temperature T is detected and recorded. 回风 _0, indoor humidity RH 回风 _0, outdoor temperature T 室外_0, the initial indoor temperature T 回风 _0 is set as the indoor target temperature T 目标 .

[0063] Step 2: Determine whether ΔRH ≥ 0 and ≥ T 室外 _0T_a. ΔRH=RH 回风 _0-RH 设定 , T_a range is 14~16℃. If ΔRH≥0 and ≥T 室外 _0T_a, execute step 3, otherwise execute step 2 again.

[0064] Step 3: The internal fan speed is adjusted to Fan_n_b, and the external fan starts at the initial speed Fan_w_a. After Δt_1 time, the compressor starts at the initial frequency Fr _0 Start, the outdoor electronic expansion valve is fully opened, and the indoor electronic expansion valve is adjusted to the initial opening P _b_0 After △t_2, the compressor oil return is complete, and the compressor, indoor fan, outdoor fan, and indoor electronic expansion valve enter automatic adjustment. During automatic adjustment, the indoor fan speed is controlled according to changes in indoor humidity, the outdoor fan speed is controlled according to changes in indoor temperature, the compressor frequency is controlled according to changes in indoor humidity, and the opening of the indoor electronic expansion valve is controlled according to changes in exhaust temperature.

[0065] According to the technical solution of this embodiment, the air conditioner includes an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor. The outdoor heat exchanger is connected to the second indoor heat exchanger after passing through the outdoor electronic expansion valve, the first indoor heat exchanger, and the indoor electronic expansion valve in sequence. After the air conditioner is in constant temperature dehumidification mode, it determines whether to start dehumidification based on the indoor relative humidity, the target indoor relative humidity, and the outdoor ambient temperature. If it is determined that dehumidification should start, the opening of the outdoor electronic expansion valve is set to the maximum, the speed of the indoor fan is controlled based on the indoor relative humidity and the target indoor relative humidity, the speed of the outdoor fan is controlled based on the indoor ambient temperature, the frequency of the compressor is controlled based on the indoor relative humidity and the target indoor relative humidity, and the opening of the indoor electronic expansion valve is controlled based on the exhaust temperature. This improves dehumidification efficiency and operating energy efficiency by maintaining a constant indoor temperature during the dehumidification process, while also preventing the indoor air from being too cold and dry, thereby enhancing indoor comfort during the dehumidification process.

[0066] According to an embodiment of the present invention, a control device for an air conditioner corresponding to the air conditioner control method is also provided. The air conditioner includes an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor; the outdoor heat exchanger is connected to the second indoor heat exchanger after passing through the outdoor electronic expansion valve, the first indoor heat exchanger, and the indoor electronic expansion valve in sequence.

[0067] The specific structure of the air conditioner is as follows Figure 3 As shown, the system includes: a compressor 1, a four-way reversing valve 2, an outdoor heat exchanger 3, an outdoor electronic expansion valve 41, an indoor electronic expansion valve 42, a first indoor heat exchanger 51, and a second indoor heat exchanger 52. The S and D ends of the four-way reversing valve 2 are connected to the intake and exhaust ports of the compressor 1, respectively, while the E and C ends are connected to the second indoor heat exchanger 52 and the outdoor heat exchanger 3, respectively. The outdoor heat exchanger 3 passes through the outdoor electronic expansion valve 41, the first indoor heat exchanger 51, and the indoor electronic expansion valve 42, before connecting to the second indoor heat exchanger 52. The first indoor pipe temperature sensor 61 is used to measure the pipe temperature of the second indoor heat exchanger 52, the outdoor pipe temperature sensor 62 is used to measure the pipe temperature of the outdoor heat exchanger 3, the exhaust temperature sensor 63 is used to measure the exhaust temperature of the compressor 1, and the second indoor temperature sensor 64 is used to measure the pipe temperature of the first indoor heat exchanger 51. The first and second indoor heat exchangers share a common indoor fan.

[0068] The air conditioner has a constant temperature dehumidification mode; the constant temperature dehumidification mode can dehumidify the room without changing the indoor ambient temperature.

[0069] In constant temperature dehumidification mode, the D and C terminals of four-way reversing valve 2 are connected, and the E and S terminals are connected. The refrigerant flows from compressor 1 to outdoor heat exchanger 3, outdoor electronic expansion valve 41, indoor first heat exchanger 51, indoor electronic expansion valve 42, indoor second heat exchanger 52, and compressor 1. The indoor first heat exchanger acts as a condenser, heating the indoor return air passing through it, while the indoor second heat exchanger cools and dehumidifies the indoor return air. The two airflows mix in the indoor unit air duct, reaching a temperature close to that of the return air and with a lower moisture content, before being returned to the room. In this mode, the indoor electronic expansion valve acts as a throttling and pressure-reducing device. Adjusting the outdoor fan speed adjusts the ratio of heat exchange between the outdoor heat exchanger and the indoor first heat exchanger, thereby regulating the supply air temperature.

[0070] See also Figure 3 FIG2 is a schematic structural diagram of an embodiment of the device of the present invention. The air conditioner control device may include: an acquisition unit 102 and a control unit 104.

[0071] The acquisition unit 102 is configured to acquire indoor relative humidity, indoor target relative humidity, outdoor ambient temperature, indoor ambient temperature, and exhaust temperature of the compressor after the air conditioner turns on the constant temperature dehumidification mode.

[0072] When the user activates constant temperature dehumidification mode, the indoor unit receives the user-set target relative humidity via the remote control and simultaneously monitors the indoor relative humidity and the ambient temperature. To improve the accuracy of indoor temperature and humidity detection, the indoor fan can be turned on to circulate indoor air into the indoor unit, allowing the sensor to accurately collect the indoor air temperature and humidity.

[0073] The control unit 104 is configured to determine whether to start dehumidification according to the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature.

[0074] After turning on the constant temperature dehumidification mode, the system will first determine whether the current indoor environment needs to be dehumidified and whether it meets the operating conditions for constant temperature dehumidification. Only when both are met at the same time can the subsequent compressor start-up, fan adjustment, expansion valve control and other operations be effective and safe, avoiding invalid operation or system abnormalities.

[0075] In some embodiments, the control unit 104 determines whether to start dehumidification based on the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature, including: judging the relationship between the indoor relative humidity and the indoor target relative humidity, and the size of the outdoor ambient temperature; if the indoor relative humidity is greater than or equal to the indoor target relative humidity, and the outdoor ambient temperature is greater than or equal to the preset outdoor temperature, determining to start dehumidification; if the indoor relative humidity is less than the indoor target relative humidity, or the outdoor ambient temperature is less than the preset outdoor temperature, determining not to perform dehumidification, and re-determining whether to start dehumidification based on the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature.

[0076] If the indoor relative humidity is greater than or equal to the target relative humidity, it means that the current humidity is higher than the target value and dehumidification is required. If the indoor relative humidity is lower than the target value, dehumidification is not required and no subsequent control is performed.

[0077] The preset outdoor temperature is the lowest outdoor temperature at which constant temperature dehumidification mode can operate, typically ranging from 10°C to 16°C, with 14°C to 16°C being preferred. If the outdoor temperature is lower than the preset outdoor temperature, it indicates that the outdoor temperature is too low and a suitable pressure differential may not be established. Therefore, constant temperature dehumidification control is only performed when the outdoor temperature is higher than or equal to the preset outdoor temperature.

[0078] By using indoor humidity and outdoor temperature as the start-up judgment conditions of the constant temperature dehumidification mode, indoor humidity is the demand trigger condition and outdoor temperature is the environmental constraint condition, the accuracy of constant temperature dehumidification control is improved and system operation or system abnormalities are avoided.

[0079] The control unit 104 is further configured to set the opening of the outdoor electronic expansion valve to the maximum if it is determined to start dehumidification, control the speed of the indoor fan according to the indoor relative humidity and the indoor target relative humidity, control the speed of the outdoor fan according to the indoor ambient temperature, control the frequency of the compressor according to the indoor relative humidity and the indoor target relative humidity, and control the opening of the indoor electronic expansion valve according to the exhaust temperature.

[0080] Indoor relative humidity is related to temperature and moisture content. At the same temperature, the lower the moisture content, the lower the relative humidity. At the same moisture content, the lower the temperature, the higher the relative humidity. While cooling and dehumidification reduce both temperature and moisture content, relative humidity doesn't necessarily decrease, resulting in a cold, but not dry, indoor environment. Constant-temperature dehumidification, on the other hand, maintains a constant indoor temperature. By reducing moisture content, relative humidity will inevitably decrease. When constant-temperature dehumidification begins, the outdoor electronic expansion valve is fully opened. The refrigerant pressure is throttled and reduced by adjusting the opening of the indoor electronic expansion valve. The indoor and outdoor fans and compressor are then turned on, and the system begins operation. The fan speeds, compressor frequency, and indoor electronic expansion valve opening are then adjusted based on the system's real-time operating parameters to achieve dehumidification without cooling the room. This prevents a cold, but not dry, indoor environment and improves comfort during dehumidification.

[0081] In some embodiments, the control unit 104 controls the speed of the indoor fan according to the indoor relative humidity and the indoor target relative humidity, including: turning on the indoor fan and running it at an initial speed; recording the difference between the indoor relative humidity and the indoor target relative humidity as a humidity difference, and judging the size of the humidity difference; if the humidity difference is greater than a preset humidity difference, controlling the speed of the indoor fan to a high speed; if the humidity difference is less than or equal to the preset humidity difference, obtaining the return air dew point temperature and the pipe temperature of the indoor second heat exchanger, recording the difference between the return air dew point temperature and the pipe temperature of the indoor second heat exchanger as a temperature difference, and judging the size of the temperature difference; if the temperature difference is greater than a preset first temperature difference, increasing the speed of the indoor fan; if the temperature difference is less than a preset second temperature difference, reducing the speed of the indoor fan; if the temperature difference is less than or equal to the preset first temperature difference and greater than or equal to the preset second temperature difference, keeping the speed of the indoor fan unchanged.

[0082] The internal fan speed control is divided into rapid dehumidification and high-efficiency dehumidification stages. When the humidity difference is greater than the preset humidity difference, rapid dehumidification is required. At this time, the internal fan runs at a high speed or high wind speed to achieve the purpose of rapid dehumidification. The preset humidity difference is 5% to 20%, preferably 10% to 15%.

[0083] When the humidity difference is less than or equal to the preset humidity difference, high-efficiency dehumidification is performed. The system controls the speed of the internal fan according to the difference between the return air dew point temperature and the temperature of the second indoor heat exchanger tube. The return air dew point temperature can be calculated based on the atmospheric pressure in the user's area, that is, the return air dew point temperature T 露点 =f(B, T 回风 , RH 回风 ), B is atmospheric pressure, T 回风 is the return air temperature, RH 回风 Return air humidity.

[0084] During efficient dehumidification, the fan speed is adjusted to keep the difference between the return air dew point and the temperature of the second indoor heat exchanger tube within the target range, i.e., the preset second temperature difference ≤ the preset temperature difference ≤ the preset first temperature. If the temperature difference exceeds the preset first difference, the temperature of the second indoor heat exchanger tube is too low. The fan speed can be increased to increase the air flow through the evaporator and improve dehumidification. If the temperature difference is less than the preset second difference, the temperature of the second indoor heat exchanger tube is too high. The fan speed can be reduced to reduce the air flow and lower the temperature. By dynamically matching the return air dew point with the evaporator tube temperature, energy efficiency is optimized.

[0085] In some embodiments, the first temperature difference is preset to ΔT opt +ΔT1, the second temperature difference is preset to ΔT opt -ΔT1, ΔT opt The value is between 3 and 5℃, and the value of △T1 is between 0 and 1℃. opt +ΔT1), then in the next adjustment cycle, the speed of the internal fan is increased by K fan_n ·(△T Fan_n -△T opt ); When the temperature difference is less than (ΔT opt -ΔT1), then in the next adjustment cycle, the speed of the internal fan is reduced by K fan_n_1 ·(△T opt -△T Fan_n ). Among them, K fan_n , K fan_n_1 is the adjustment coefficient, △T Fan_n is the temperature difference in the current adjustment cycle.

[0086] In some embodiments, the control unit 104 controls the speed of the outdoor fan according to the indoor ambient temperature, including: turning on the outdoor fan and running it at an initial speed; recording the indoor ambient temperature when the air conditioner turns on the constant temperature dehumidification mode as the set temperature; calculating the change in the difference between the indoor ambient temperature and the set temperature, and recording it as the temperature difference change; calculating the speed adjustment amount of the outdoor fan according to the difference between the indoor ambient temperature and the set temperature, the temperature difference change and a preset first feedback control algorithm; controlling the speed of the outdoor fan to be the sum of the current speed and the speed adjustment amount.

[0087] The speed of the outdoor fan is controlled by PI based on the indoor temperature, with an adjustment cycle of 2 to 10 minutes, preferably 3 to 5 minutes. In order to keep the indoor temperature constant during the dehumidification process, the indoor temperature at the initial dehumidification moment is used as the set temperature. By controlling the speed of the outdoor fan, the heat exchange of the outdoor condenser is changed, and then the heating amount of the indoor first heat exchanger to the indoor air is adjusted, and the indoor air outlet temperature is adjusted to keep the indoor temperature constant. The temperature difference change σT n Is the average temperature difference △T in the current adjustment period n The average temperature difference △T from the previous adjustment cycle n-1 The difference, σT n =△T n -△T n-1 The first feedback control algorithm is preset as △Fan _w_n =Kp _Fan_w ·△T n +Ki _Fan ·σT n , is the speed adjustment of the external fan, Kp _Fan_w 、Ki _Fan is the speed adjustment coefficient of the external fan. Then the speed of the external fan in the next cycle is Fan _w_(n+1) =Fan _w_n +△Fan _w_n , Fan _w_n The external fan speed in the current adjustment cycle.

[0088] Through the temperature difference dynamic adjustment mechanism based on indoor temperature changes and PI algorithm, the indoor temperature is ensured to remain unchanged during the dehumidification process, achieving the effect of constant temperature dehumidification.

[0089] In some embodiments, the control unit 104 controls the frequency of the compressor according to the indoor relative humidity and the indoor target relative humidity, and the specific process includes: starting the compressor and running it at an initial frequency; recording the difference between the indoor relative humidity and the indoor target relative humidity as a humidity difference, and calculating a change in the humidity difference; calculating a frequency adjustment amount of the compressor according to the humidity difference, the change in the humidity difference, and a preset second feedback control algorithm; and controlling the frequency of the compressor to be the sum of the current frequency and the frequency adjustment amount.

[0090] Initial frequency of the compressor Fr _a The humidity difference △RH and indoor temperature T 回风 Determine, that is, Fr _a =f(ΔRH, T 回风 After determining the initial frequency, the system will also determine the size of the initial frequency and the oil return frequency. If the initial frequency ≥ the oil return frequency, the compressor will operate according to the initial frequency. If the initial frequency < the oil return frequency, the compressor will operate according to the oil return frequency.

[0091] The compressor frequency determines the refrigerant flow rate and dehumidification capacity. The higher the compressor frequency, the greater the dehumidification capacity. Therefore, according to the change of the indoor humidity difference, the compressor frequency is dynamically adjusted to match the dehumidification capacity with the current ambient humidity, avoiding problems such as poor dehumidification effect or excessive dehumidification. The adjustment cycle of the compressor frequency can be set to 2 to 6 minutes, preferably 3 to 5 minutes. The change in humidity difference σRH n Is the humidity difference △RH in the current adjustment cycle n Humidity difference △RH from the previous adjustment cycle n-1 The difference, σRH n =△RH n -△RH n-1 The second feedback control algorithm is preset as △Fr n =Kp _comp △RH n +Ki _comp ·σRH n , △Fr n Kp is the frequency adjustment of the compressor _comp 、Ki _comp is the compressor frequency adjustment coefficient. Then the compressor frequency Fr of the next cycle is (n+1) =Fr n +△Fr n , Fr n The compressor frequency of the current regulation cycle.

[0092] By controlling the compressor frequency based on indoor humidity fluctuations and the PI algorithm, the compressor frequency dynamically adjusts to actual humidity demand. For example, when indoor humidity drops rapidly, the frequency adjustment amplitude is automatically reduced to avoid excessive dehumidification caused by high-frequency operation. This ensures dehumidification effectiveness while achieving a balance between energy efficiency and dehumidification comfort.

[0093] In some embodiments, the control unit 104 controls the opening of the indoor electronic expansion valve according to the exhaust temperature, and the specific process includes: controlling the opening of the indoor electronic expansion valve to be an initial opening; calculating the change in the difference between the exhaust temperature and the preset target exhaust temperature, recorded as the exhaust temperature difference change; calculating the opening adjustment amount of the indoor electronic expansion valve according to the difference between the exhaust temperature and the preset target exhaust temperature, the exhaust temperature difference change and a preset third feedback control algorithm; and controlling the opening of the indoor electronic expansion valve to be the sum of the current opening and the opening adjustment amount.

[0094] The initial opening of the indoor electronic expansion valve corresponds to the initial frequency of the compressor, and then the exhaust temperature T_ 排气 and target exhaust temperature T_ 目标排气 The difference △T dis =T_ 排气 -T_ 目标排气 The adjustment cycle of the indoor electronic expansion valve is the same as that of the compressor. 目标排气 The compressor frequency Fr, outdoor heat exchanger tube temperature T_ 冷凝管温 , Indoor second heat exchanger tube temperature T_ 蒸发管温 Experimental fitting is performed to obtain, for example, T_ 目标排气 =a*Fr+b*T_ 冷凝管温 +c*T_ 蒸发管温 +d, where a, b, c, and d are constants. Exhaust temperature change σT _dis_n Is the average value of the exhaust temperature difference △T during the current adjustment cycle _dis_n Average value of exhaust temperature difference △T from the previous adjustment cycle _dis_(n-1) The difference, σT _dis_n =△T _dis_n -△T _dis_(n-1) The third feedback control algorithm is preset as △B _n =Kp _EEV_n ·△T _dis_n +Ki _EEV_n ·σT _dis_n , △B _n is the opening adjustment amount, Kp _EEV_n 、Ki _EEV_n is the opening adjustment coefficient. Then the opening of the indoor electronic expansion valve in the next cycle is B _(n+1) =B _n+△B _n , B _n It is the opening degree of the indoor electronic expansion valve in the current adjustment cycle.

[0095] It should be noted that in the constant temperature dehumidification mode, when the outdoor fan stops or the speed is lower than a certain level, the refrigerant at the outdoor pipe temperature sensor 62 is in an overheated state, and the temperature T_ 再热管温 Replace outdoor pipe temperature T_ 冷凝管温 Calculate the target exhaust temperature.

[0096] Exhaust temperature can reflect whether the current refrigerant flow is appropriate. Excessively high exhaust temperature may indicate insufficient refrigerant flow (expansion valve opening too small), leading to compressor overheating. Excessively low exhaust temperature may indicate excessive refrigerant flow (expansion valve opening too large), leading to the risk of liquid hammer. Therefore, by controlling the opening of the indoor electronic expansion valve based on the exhaust temperature, the refrigerant flow is adjusted to maintain the exhaust temperature within the appropriate range, thereby improving the safety and efficiency of air conditioning operation.

[0097] Figure 4 It is a flow chart of the constant temperature dehumidification mode of the present invention, as shown in FIG. Figure 4 As shown, the method includes:

[0098] Step 1: After the air conditioner turns on the constant temperature dehumidification mode, obtain the target relative humidity RH set by the user 设定 , the indoor fan is turned on at the initial wind speed Fan_n_a, and the initial indoor temperature T is detected and recorded. 回风 _0, indoor humidity RH 回风 _0, outdoor temperature T 室外 _0, the initial indoor temperature T 回风 _0 is set as the indoor target temperature T 目标 .

[0099] Step 2: Determine whether ΔRH ≥ 0 and ≥ T 室外 _0T_a. ΔRH=RH 回风 _0-RH 设定 , T_a range is 14~16℃. If ΔRH≥0 and ≥T 室外 _0T_a, execute step 3, otherwise execute step 2 again.

[0100] Step 3: The internal fan speed is adjusted to Fan_n_b, and the external fan starts at the initial speed Fan_w_a. After Δt_1 time, the compressor starts at the initial frequency Fr _0 Start, the outdoor electronic expansion valve is fully opened, and the indoor electronic expansion valve is adjusted to the initial opening P _b_0After △t_2, the compressor oil return is complete, and the compressor, indoor fan, outdoor fan, and indoor electronic expansion valve enter automatic adjustment. During automatic adjustment, the indoor fan speed is controlled according to changes in indoor humidity, the outdoor fan speed is controlled according to changes in indoor temperature, the compressor frequency is controlled according to changes in indoor humidity, and the opening of the indoor electronic expansion valve is controlled according to changes in exhaust temperature.

[0101] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0102] The technical solution of the present invention includes an air conditioner comprising an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor. The outdoor heat exchanger is sequentially connected to the outdoor electronic expansion valve, the first indoor heat exchanger, the indoor electronic expansion valve, and the second indoor heat exchanger. After the air conditioner is in constant temperature dehumidification mode, it determines whether to start dehumidification based on the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature. If it is determined that dehumidification should start, the opening of the outdoor electronic expansion valve is set to the maximum, the speed of the indoor fan is controlled based on the indoor relative humidity and the indoor target relative humidity, the speed of the outdoor fan is controlled based on the indoor ambient temperature, the frequency of the compressor is controlled based on the indoor relative humidity and the indoor target relative humidity, and the opening of the indoor electronic expansion valve is controlled based on the exhaust temperature. This improves dehumidification efficiency and operating energy efficiency by maintaining a constant indoor temperature during dehumidification, while also preventing the indoor room from being too cold and dry, thereby enhancing indoor comfort during dehumidification.

[0103] According to an embodiment of the present invention, an air conditioner corresponding to the air conditioner control device is also provided. The air conditioner may include: the air conditioner control device described above.

[0104] Since the processing and functions implemented by the air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0105] The air conditioner employing the technical solution of the present invention includes an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor. The outdoor heat exchanger sequentially passes through the outdoor electronic expansion valve, the first indoor heat exchanger, and the indoor electronic expansion valve before being connected to the second indoor heat exchanger. After the air conditioner is in constant temperature dehumidification mode, it determines whether to start dehumidification based on the indoor relative humidity, the target indoor relative humidity, and the outdoor ambient temperature. If dehumidification is determined to start, the opening of the outdoor electronic expansion valve is set to maximum, the speed of the indoor fan is controlled based on the indoor relative humidity and the target indoor relative humidity, the speed of the outdoor fan is controlled based on the indoor ambient temperature, the frequency of the compressor is controlled based on the indoor relative humidity and the target indoor relative humidity, and the opening of the indoor electronic expansion valve is controlled based on the exhaust temperature. This improves dehumidification efficiency and operating energy efficiency by maintaining a constant indoor temperature during dehumidification, while also preventing the indoor room from being too cold and dry, thereby enhancing indoor comfort during dehumidification.

[0106] According to an embodiment of the present invention, a storage medium corresponding to the air conditioner control method is also provided, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned air conditioner control method.

[0107] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0108] The air conditioner employing the technical solution of the present invention includes an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor. The outdoor heat exchanger sequentially passes through the outdoor electronic expansion valve, the first indoor heat exchanger, and the indoor electronic expansion valve before being connected to the second indoor heat exchanger. After the air conditioner is in constant temperature dehumidification mode, it determines whether to start dehumidification based on the indoor relative humidity, the target indoor relative humidity, and the outdoor ambient temperature. If dehumidification is determined to start, the opening of the outdoor electronic expansion valve is set to maximum, the speed of the indoor fan is controlled based on the indoor relative humidity and the target indoor relative humidity, the speed of the outdoor fan is controlled based on the indoor ambient temperature, the frequency of the compressor is controlled based on the indoor relative humidity and the target indoor relative humidity, and the opening of the indoor electronic expansion valve is controlled based on the exhaust temperature. This improves dehumidification efficiency and operating energy efficiency by maintaining a constant indoor temperature during dehumidification, while also preventing the indoor room from being too cold and dry, thereby enhancing indoor comfort during dehumidification.

[0109] According to an embodiment of the present invention, a computer program product corresponding to the air conditioner control method is also provided. The computer program product includes a computer program. When the computer program product is processed and executed, the steps of the air conditioner control method are implemented.

[0110] Since the processing and functions implemented by the computer program product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0111] The air conditioner employing the technical solution of the present invention includes an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor. The outdoor heat exchanger sequentially passes through the outdoor electronic expansion valve, the first indoor heat exchanger, and the indoor electronic expansion valve before being connected to the second indoor heat exchanger. After the air conditioner is in constant temperature dehumidification mode, it determines whether to start dehumidification based on the indoor relative humidity, the target indoor relative humidity, and the outdoor ambient temperature. If dehumidification is determined to start, the opening of the outdoor electronic expansion valve is set to maximum, the speed of the indoor fan is controlled based on the indoor relative humidity and the target indoor relative humidity, the speed of the outdoor fan is controlled based on the indoor ambient temperature, the frequency of the compressor is controlled based on the indoor relative humidity and the target indoor relative humidity, and the opening of the indoor electronic expansion valve is controlled based on the exhaust temperature. This improves dehumidification efficiency and operating energy efficiency by maintaining a constant indoor temperature during dehumidification, while also preventing the indoor room from being too cold and dry, thereby enhancing indoor comfort during dehumidification.

[0112] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0113] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims.

Claims

1. A method for controlling an air conditioner, characterized in that: The air conditioner includes an outdoor electronic expansion valve, an indoor electronic expansion valve, an indoor first heat exchanger, an indoor second heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor; the outdoor heat exchanger is connected to the indoor second heat exchanger after passing through the outdoor electronic expansion valve, the indoor first heat exchanger, and the indoor electronic expansion valve in sequence; The air conditioner has a constant temperature dehumidification mode; the constant temperature dehumidification mode can dehumidify the room without changing the indoor ambient temperature; The method comprises: After the air conditioner turns on the constant temperature dehumidification mode, obtaining indoor relative humidity, indoor target relative humidity, outdoor ambient temperature, indoor ambient temperature, and exhaust temperature of the compressor; determining whether to start dehumidification according to the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature; If it is determined to start dehumidification, the opening of the outdoor electronic expansion valve is set to the maximum, the speed of the indoor fan is controlled according to the indoor relative humidity and the indoor target relative humidity, the speed of the outdoor fan is controlled according to the indoor ambient temperature, the frequency of the compressor is controlled according to the indoor relative humidity and the indoor target relative humidity, and the opening of the indoor electronic expansion valve is controlled according to the exhaust temperature.

2. The air conditioner control method according to claim 1, characterized in that: Determining whether to start dehumidification according to the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature includes: Determining the relationship between the indoor relative humidity and the indoor target relative humidity, as well as the outdoor ambient temperature; If the indoor relative humidity is greater than or equal to the indoor target relative humidity, and the outdoor ambient temperature is greater than or equal to the preset outdoor temperature, determining to start dehumidification; If the indoor relative humidity is lower than the indoor target relative humidity, or the outdoor ambient temperature is lower than a preset outdoor temperature, it is determined that dehumidification is not performed.

3. The air conditioner control method according to claim 1, characterized in that: Controlling the rotation speed of the indoor fan according to the indoor relative humidity and the indoor target relative humidity includes: Turn on the internal fan and run it at an initial speed; Recording the difference between the indoor relative humidity and the indoor target relative humidity as a humidity difference, and determining the magnitude of the humidity difference; If the humidity difference is greater than a preset humidity difference, the speed of the internal fan is controlled to be a high speed; If the humidity difference is less than or equal to the preset humidity difference, obtaining the return air dew point temperature and the tube temperature of the second indoor heat exchanger, recording the difference between the return air dew point temperature and the tube temperature of the second indoor heat exchanger as the temperature difference, and determining the magnitude of the temperature difference; If the temperature difference is greater than a preset first temperature difference, increasing the speed of the internal fan; If the temperature difference is less than the preset second temperature difference, reducing the speed of the internal fan; If the temperature difference is less than or equal to the preset first temperature difference and greater than or equal to the preset second temperature difference, the rotation speed of the internal fan is kept unchanged.

4. The air conditioner control method according to claim 1, characterized in that: Controlling the rotation speed of the outdoor fan according to the indoor ambient temperature includes: Turn on the external fan and run it at an initial speed; Recording the indoor ambient temperature when the air conditioner is in the constant temperature dehumidification mode as the set temperature; Calculating the change in the difference between the indoor ambient temperature and the set temperature, and recording it as the temperature difference change; Calculating a speed adjustment amount of the outdoor fan according to a difference between the indoor ambient temperature and the set temperature, a change in the temperature difference, and a preset first feedback control algorithm; The rotation speed of the external fan is controlled to be the sum of the current rotation speed and the rotation speed adjustment amount.

5. The air conditioner control method according to claim 1, characterized in that: Controlling the frequency of the compressor according to the indoor relative humidity and the indoor target relative humidity includes: turning on the compressor and running it at an initial frequency; Recording the difference between the indoor relative humidity and the indoor target relative humidity as a humidity difference, and calculating a change in the humidity difference; calculating a frequency adjustment amount of the compressor according to the humidity difference, a change in the humidity difference, and a preset second feedback control algorithm; The frequency of the compressor is controlled to be the sum of the current frequency and the frequency adjustment amount.

6. The air conditioner control method according to claim 1, characterized in that: Controlling the opening of the indoor electronic expansion valve according to the exhaust temperature includes: controlling the opening of the indoor electronic expansion valve to an initial opening; Calculating a change in the difference between the exhaust temperature and a preset target exhaust temperature, and recording the change as the exhaust temperature difference; Calculating an opening adjustment amount of the indoor electronic expansion valve according to a difference between the exhaust temperature and a preset target exhaust temperature, a variation of the exhaust temperature difference, and a preset third feedback control algorithm; The opening degree of the indoor electronic expansion valve is controlled to be the sum of the current opening degree and the opening degree adjustment amount.

7. A control device for an air conditioner, characterized in that: The air conditioner includes an outdoor electronic expansion valve, an indoor electronic expansion valve, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, and a compressor; the outdoor heat exchanger is sequentially connected to the outdoor electronic expansion valve, the first indoor heat exchanger, the indoor electronic expansion valve, and the second indoor heat exchanger; The air conditioner has a constant temperature dehumidification mode; the constant temperature dehumidification mode can dehumidify the room without changing the indoor ambient temperature; The device comprises: an acquiring unit configured to acquire, after the air conditioner turns on the constant temperature dehumidification mode, the indoor relative humidity, the indoor target relative humidity, the outdoor ambient temperature, the indoor ambient temperature, and the exhaust temperature of the compressor; a control unit configured to determine whether to start dehumidification according to the indoor relative humidity, the indoor target relative humidity, and the outdoor ambient temperature; The control unit is further configured to set the opening of the outdoor electronic expansion valve to the maximum if it is determined to start dehumidification, control the speed of the indoor fan according to the indoor relative humidity and the indoor target relative humidity, control the speed of the outdoor fan according to the indoor ambient temperature, control the frequency of the compressor according to the indoor relative humidity and the indoor target relative humidity, and control the opening of the indoor electronic expansion valve according to the exhaust temperature.

8. An air conditioner, characterized in that: include: The air conditioner control device according to claim 7.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the air conditioner control method according to any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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