Dehumidification control method and control device of air conditioner, and air conditioner

Abstract

The application relates to the field of electrical appliances, and provides a dehumidification control method and device of an air conditioner and the air conditioner. The dehumidification control method comprises the following steps: after the air conditioner runs in a heating mode for a preset time, acquiring an indoor temperature, a target temperature and an indoor relative humidity; according to the indoor temperature and the target temperature, determining a dehumidification mode type allowed to enter; according to the indoor relative humidity and the dehumidification mode type allowed to enter, determining a target dehumidification mode; and based on the target dehumidification mode, controlling the adjustment of working parameters of the air conditioner; the working parameters at least include the opening degree of an outdoor expansion valve and the opening degree of an indoor expansion valve. The application introduces a temperature difference and humidity dual criterion mechanism, dynamically selects a suitable dehumidification mode, and cooperatively adjusts the opening degrees of the outdoor expansion valve and the indoor expansion valve, so that the two indoor heat exchangers bear the heating and dehumidification functions respectively, thereby realizing efficient humidity control without interrupting the heating and without blowing cold air.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to a dehumidification control method, control device, and air conditioner for air conditioning. Background Technology

[0002] In existing air conditioning technology, the dehumidification function in heating mode has long faced the challenge of balancing thermal comfort and dehumidification efficiency. In conventional single-heat-exchanger air conditioners, the indoor heat exchanger functions as a condenser during heating, with its surface temperature typically maintained above 40°C, far exceeding the dew point temperature of the indoor air. Therefore, it lacks the physical conditions for condensation and dehumidification, and cannot actively reduce air humidity. Users in high-humidity, cold environments often experience a feeling of "stuffy heat" or "damp cold," resulting in a significant decrease in actual thermal comfort.

[0003] To address this issue, some existing solutions employ an alternating operation strategy of "cooling and dehumidifying first, then heating to raise the temperature." This method uses a four-way valve to switch the system's circulation direction, achieving dehumidification during the cooling phase and then switching back to heating mode to raise the room temperature. However, this process causes periodic sharp drops in the outlet air temperature, making users easily perceive noticeable cold air and disrupting the continuous thermal comfort experience. Simultaneously, frequent switching of operating modes increases the number of compressor start-stop cycles, affecting equipment lifespan and reducing energy efficiency.

[0004] Other technologies attempt to introduce bypass branches or electronic expansion valves for fine-tuning during heating, allowing a small amount of refrigerant to flow through low-temperature areas to achieve localized dehumidification. However, such structures are complex, and the control logic is difficult to precisely match dynamic operating conditions. Furthermore, due to limited refrigerant distribution, the dehumidification capacity is generally low. In addition, excessive throttling to enhance dehumidification can lead to insufficient heating capacity of the main heat exchanger, resulting in a drop in outlet air temperature and ultimately weakening heating performance. Some solutions balance heating and cooling by reducing the compressor frequency, but this further limits the system's dehumidification potential, especially in low-temperature, high-humidity environments where the effect is minimal.

[0005] In summary, existing technologies either fail to dehumidify at all in heating mode, or require sacrificing outlet air temperature stability, heating continuity, or system energy efficiency in exchange for limited dehumidification capacity. A single indoor heat exchanger structure cannot simultaneously meet the conflicting demands of high-temperature heat release and low-temperature condensation in the same cycle, and existing control strategies lack a mechanism for coordinating the assessment of heating capacity and humidity levels, resulting in a disconnect between dehumidification actions and actual needs. Summary of the Invention

[0006] This invention provides a dehumidification control method, control device, and air conditioner for air conditioning, which addresses the deficiencies in the prior art and achieves the following effects: by introducing a dual criterion mechanism of temperature difference and humidity, a suitable dehumidification mode is dynamically selected, and the opening of the outdoor expansion valve and the indoor expansion valve are coordinated and adjusted, so that the two indoor heat exchangers respectively undertake the functions of heating and dehumidification, thereby achieving efficient humidity control without interrupting heating or producing cold air.

[0007] In a first aspect, the present invention provides a dehumidification control method for an air conditioner, wherein the indoor unit of the air conditioner includes at least two indoor heat exchangers connected in sequence and an indoor expansion valve located between the two indoor heat exchangers, and the outdoor unit includes an outdoor expansion valve, the dehumidification control method comprising: After the air conditioner has been running in heating mode for a preset time, the indoor temperature, target temperature, and indoor relative humidity are obtained. Based on the indoor temperature and the target temperature, determine the type of dehumidification mode that can be entered; Determine the target dehumidification mode based on the indoor relative humidity and the permissible dehumidification mode type; Based on the target dehumidification mode, the operating parameters of the air conditioner are controlled and adjusted. In the target dehumidification mode, one of the indoor heat exchangers acts as a heating heat exchanger to generate heat, and at least another indoor heat exchanger acts as a dehumidification heat exchanger to dehumidify. The operating parameters include at least the opening degree of the outdoor expansion valve and the opening degree of the indoor expansion valve.

[0008] According to some embodiments of the present invention, the permitted dehumidification mode types include a powerful dehumidification mode and an automatic dehumidification mode; the step of determining the permitted dehumidification mode type based on the indoor temperature and the target temperature includes: When the difference between the indoor temperature and the target temperature is greater than or equal to the first preset temperature, the powerful dehumidification mode and the automatic dehumidification mode are allowed to be entered. If the difference between the indoor temperature and the target temperature is less than the first preset temperature and greater than or equal to the second preset temperature, the automatic dehumidification mode is allowed to be entered only. If the difference between the indoor temperature and the target temperature is less than the second preset temperature, entering any dehumidification mode is prohibited.

[0009] According to some embodiments of the present invention, the step of determining the target dehumidification mode based on the indoor relative humidity and the permissible dehumidification mode type includes: If the difference between the indoor relative humidity and the reference humidity value is greater than or equal to a first set percentage, and the allowed dehumidification mode type includes a powerful dehumidification mode, then the target dehumidification mode is determined to be a powerful dehumidification mode. If the difference between the indoor relative humidity and the reference humidity value is less than a first set percentage and greater than or equal to zero, and the allowed dehumidification mode type includes automatic dehumidification mode, then the target dehumidification mode is determined to be automatic dehumidification mode. In response to the difference between the indoor relative humidity and the reference humidity value being less than zero, or the air conditioner being prohibited from entering any dehumidification mode, the air conditioner is controlled to maintain the heating mode unchanged.

[0010] According to some embodiments of the present invention, the step of controlling and adjusting the operating parameters of the air conditioner based on the target dehumidification mode includes: According to the target dehumidification mode, control and adjust the opening degree of the indoor expansion valve and / or the outdoor expansion valve.

[0011] According to some embodiments of the present invention, the step of controlling and adjusting the opening degree of the indoor expansion valve and / or the outdoor expansion valve according to the target dehumidification mode includes: In automatic dehumidification mode, the opening of the outdoor expansion valve is increased to a level greater than a first preset ratio, and the opening of the indoor expansion valve is set to a second preset ratio of the opening of the outdoor expansion valve. In the powerful dehumidification mode, the opening of the outdoor expansion valve is increased to a level greater than the third preset ratio, and the opening of the indoor expansion valve is set to the fourth preset ratio of the opening of the outdoor expansion valve. Wherein, the first preset ratio is greater than 1, the third preset ratio is greater than the first preset ratio, and the fourth preset ratio is less than the second preset ratio.

[0012] According to some embodiments of the present invention, after the step of controlling and adjusting the opening degree of the indoor expansion valve and / or the outdoor expansion valve according to the target dehumidification mode, the method further includes: The temperature of the dehumidification coil of the dehumidification heat exchanger is detected in real time, and the corresponding coil temperature control strategy is executed according to the target dehumidification mode and the dehumidification coil temperature. In the powerful dehumidification mode, in response to the dehumidification coil temperature being higher than the first target temperature range, the opening of the indoor expansion valve is reduced; or, in response to the dehumidification coil temperature being lower than the first target temperature range, the opening of the indoor expansion valve is increased; or, in response to the dehumidification coil temperature being within the first target temperature range, the opening of the indoor expansion valve remains unchanged. In automatic dehumidification mode, the dew point temperature is calculated based on the indoor temperature and the indoor relative humidity, and a second target temperature range is determined based on the dew point temperature; in response to the dehumidification coil temperature being higher than the second target temperature range, the opening of the indoor expansion valve is reduced; or, in response to the dehumidification coil temperature being lower than the second target temperature range, the opening of the indoor expansion valve is increased; or, in response to the dehumidification coil temperature being within the second target temperature range, the opening of the indoor expansion valve remains unchanged.

[0013] According to some embodiments of the present invention, a rotatable air guide plate is provided in the air outlet duct of the indoor unit, and the air guide plate is configured to adjust the distribution ratio of airflow between the first indoor heat exchanger and the second indoor heat exchanger. Then, after the step of controlling and adjusting the operating parameters of the air conditioner based on the target dehumidification mode, the method further includes: Get the current outlet air temperature and indoor temperature; Based on the indoor temperature and the target temperature, the temperature control logic under the heating mode is determined; Under the temperature control logic, the rotation angle of the air guide plate is controlled and adjusted according to the outlet air temperature and the indoor temperature. Wherein, if the difference between the indoor temperature and the target temperature is greater than or equal to the set temperature, the temperature control logic is a constant temperature control logic; or, if the difference between the indoor temperature and the target temperature is less than the set temperature, the temperature control logic is a heating control logic; wherein the set temperature is less than or equal to zero.

[0014] According to some embodiments of the present invention, the step of controlling and adjusting the rotation angle of the air guide plate based on the outlet air temperature and the indoor temperature under the temperature control logic includes: Under the constant temperature control logic, in response to the difference between the outlet air temperature and the indoor temperature being higher than the first temperature difference range, the angle of the air guide plate is adjusted to reduce the proportion of airflow flowing through the heat exchanger in the heating room; in response to the difference between the outlet air temperature and the indoor temperature being lower than the first temperature difference range, the angle of the air guide plate is adjusted to increase the proportion of airflow flowing through the heat exchanger in the heating room; in response to the difference between the outlet air temperature and the indoor temperature being within the first temperature difference range, the angle of the air guide plate is kept unchanged. Under the heating control logic, in response to the difference between the outlet air temperature and the indoor temperature being higher than the second temperature difference range, the angle of the air guide plate is adjusted to reduce the proportion of airflow flowing through the heat exchanger in the heating room; in response to the difference between the outlet air temperature and the indoor temperature being lower than the second temperature difference range, the angle of the air guide plate is adjusted to increase the proportion of airflow flowing through the heat exchanger in the heating room; in response to the difference between the outlet air temperature and the indoor temperature being within the second temperature difference range, the angle of the air guide plate is kept constant. The first temperature difference range is smaller than the second temperature difference range.

[0015] Secondly, the present invention also protects a dehumidification control device for an air conditioner, wherein the indoor unit of the air conditioner includes at least two indoor heat exchangers connected in sequence and an indoor expansion valve located between the two indoor heat exchangers, and the outdoor unit includes an outdoor expansion valve; the dehumidification control device includes: The first acquisition module is used to acquire the indoor temperature, target temperature and indoor relative humidity after the air conditioner has been running in heating mode for a preset time. The second acquisition module is used to determine the type of dehumidification mode that can be entered based on the indoor temperature and the target temperature; The third acquisition module is used to determine the target dehumidification mode based on the indoor relative humidity and the allowed dehumidification mode type. A control module is used to control and adjust the operating parameters of the air conditioner based on the target dehumidification mode, wherein, in the target dehumidification mode, one of the indoor heat exchangers acts as a heating heat exchanger to generate heat, and at least another indoor heat exchanger acts as a dehumidification heat exchanger to dehumidify; the operating parameters include at least the opening degree of the outdoor expansion valve and the opening degree of the indoor expansion valve.

[0016] Thirdly, the present invention also protects an air conditioner, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the indoor unit of the air conditioner includes two indoor heat exchangers connected in sequence and an indoor expansion valve located between the two indoor heat exchangers, and the outdoor unit includes an outdoor expansion valve, wherein the processor executes the program to implement the steps of the dehumidification control method of the air conditioner as described in the first aspect of the present invention.

[0017] In summary, the dehumidification control method of this invention can achieve efficient and stable dehumidification during continuous heating of the air conditioner, while avoiding a sudden drop in outlet air temperature or a significant decrease in heating capacity. It can be understood that by introducing a dual-indoor heat exchanger structure and multi-parameter collaborative control logic, the system can adjust the dehumidification intensity as needed without switching operating modes or producing cold air, effectively balancing indoor thermal comfort and humidity control requirements, and significantly improving the user experience in high-humidity and cold environments.

[0018] Specifically, firstly, the indoor unit employs a structure with a first indoor heat exchanger, an indoor expansion valve, and a second indoor heat exchanger connected in sequence. This allows the first heat exchanger to continuously release heat as a high-temperature heating component during the heating cycle, while the second heat exchanger, after throttling, maintains a low-temperature state for condensation and dehumidification. This physically separates heating and dehumidification functions, resolving the inherent contradiction that a single heat exchanger cannot simultaneously satisfy both high-temperature heat release and low-temperature dehumidification. Secondly, this invention first determines the permissible dehumidification mode type by judging the difference between the indoor temperature and the target temperature, and then combines this with the indoor relative humidity to determine the final target dehumidification mode. This dual-criteria mechanism ensures that dehumidification is only activated when the system has sufficient heating capacity and the humidity is indeed high, avoiding ineffective or excessive dehumidification. Finally, based on the target dehumidification mode, the opening of the outdoor and indoor expansion valves is coordinated and adjusted to precisely control the refrigerant distribution ratio between the two heat exchangers. This keeps the coil temperature of the dehumidification heat exchanger stable within the effective dehumidification range, ensuring both dehumidification efficiency and maintaining stable outlet air temperature. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the refrigerant circuit of the air conditioner provided by the present invention.

[0021] Figure 2 This is a schematic diagram of the structure inside the air outlet duct of the air conditioner provided by the present invention.

[0022] Figure 3 This is one of the flowcharts illustrating the dehumidification control method for air conditioning provided by the present invention.

[0023] Figure 4 This is the second flowchart of the dehumidification control method for air conditioning provided by the present invention.

[0024] Figure 5 This is a schematic diagram of the dehumidification control device for air conditioning provided by the present invention.

[0025] Figure 6 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0026] Figure label: 1. Compressor; 2. Outdoor heat exchanger; 31. First indoor heat exchanger; 32. Second indoor heat exchanger; 4. Indoor expansion valve; 5. Outdoor expansion valve; 6. Four-way valve; 7. Air guide plate; 71. Air outlet duct; 72. Air outlet. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0028] The dehumidification control method, control device, and air conditioner proposed in this invention are described below with reference to the accompanying drawings. Before detailing the embodiments of this invention, the overall application scenario is described first. The dehumidification control method, control device, electronic device, and computer-readable storage medium of this invention can be applied locally to the air conditioner, to cloud platforms in the Internet field, or to other types of cloud platforms in the Internet field, or to third-party devices. These third-party devices may include various types such as mobile phones, tablets, laptops, in-vehicle computers, and other smart terminals.

[0029] The following description uses only the dehumidification control method applicable to air conditioners as an example. It should be understood that the dehumidification control method of this invention can also be applied to cloud platforms and third-party devices.

[0030] Before introducing the dehumidification control method of this invention, a brief description of the structure of the air conditioner on which this method is based will be given first: such as Figure 1 and Figure 2 As shown, the air conditioning system includes an indoor unit and an outdoor unit. The indoor unit contains at least two indoor heat exchangers. The following description uses two indoor heat exchangers as an example, without loss of generality. These two indoor heat exchangers are a first indoor heat exchanger 31 and a second indoor heat exchanger 32, arranged sequentially along the airflow direction and connected in series via piping. An indoor expansion valve 4 is installed on the refrigerant piping between the first indoor heat exchanger 31 and the second indoor heat exchanger 32 to regulate the refrigerant flow rate and pressure flowing into the second indoor heat exchanger 32. The outdoor unit includes a compressor 1, an outdoor heat exchanger 2, and an outdoor expansion valve 5. The outdoor expansion valve 5 is located on the outlet or inlet side of the outdoor heat exchanger 2 and is used to regulate the refrigerant state entering the indoor unit.

[0031] In heating mode, high-temperature, high-pressure gaseous refrigerant is discharged from compressor 1 and, after being switched by four-way valve 6, first enters the first indoor heat exchanger 31, where it releases heat to heat the indoor air. Subsequently, the refrigerant flows through indoor expansion valve 4 for throttling and pressure reduction before entering the second indoor heat exchanger 32. At this point, the surface temperature of the second indoor heat exchanger 32 is lower than the dew point temperature of the indoor air, thus achieving cooling and dehumidification of the return air. The dehumidified air then mixes with the airflow heated by the first indoor heat exchanger 31 and is finally delivered by the fan, achieving the goal of reducing indoor humidity while maintaining heating performance.

[0032] The indoor unit's air outlet duct 71 is also equipped with an air guide vane 7 driven by a stepper motor. This air guide vane 7 can rotate around an axis, and by changing its opening and closing angle, the air distribution ratio flowing through the first indoor heat exchanger 31 and the second indoor heat exchanger 32 can be adjusted. For example, when the angle of the air guide vane 7 decreases, more airflow is directed to the first indoor heat exchanger 31, and the airflow through the second indoor heat exchanger 32 decreases accordingly; conversely, increasing the angle of the air guide vane 7 increases the airflow through the second indoor heat exchanger 32.

[0033] The dehumidification control method of the air conditioner of the present invention will be described below with reference to the accompanying drawings.

[0034] like Figure 3 and Figure 4 As shown, the dehumidification control method for an air conditioner according to a first aspect embodiment of the present invention includes: Step S1: After the air conditioner has been running in heating mode for a preset time, obtain the indoor temperature, target temperature, and indoor relative humidity.

[0035] The above steps ensure that the system has entered a stable heating state before initiating the dehumidification logic, avoiding misjudgments caused by parameter fluctuations during the initial heating phase. Specifically, indoor temperature refers to the actual temperature of the current indoor environment, collected by a temperature sensor located at the indoor unit's return air vent or in the remote control; target temperature is the desired room temperature set by the user through the control panel; and indoor relative humidity represents the percentage of water vapor content in the air relative to saturation, detected in real-time by a humidity sensor. For example, after the air conditioner has been running for 5 minutes, the system reads an indoor temperature of 18°C, a target temperature of 22°C, and a relative humidity of 65%. This step provides the basic data support for subsequent mode determination.

[0036] Step S2: Determine the permissible dehumidification mode type based on the indoor temperature and the target temperature.

[0037] The above steps are understood to assess whether the current heating capacity is sufficient to support dehumidification. If the room temperature is close to or has reached the set value, it indicates a low heat load and the system has sufficient capacity for dehumidification. If the room temperature is significantly lower than the set value, priority is given to heating up, while dehumidification is limited or disabled to prevent excessively cold air from the outlet. The allowed dehumidification mode type refers to the dehumidification strategy options enabled by the system based on the temperature difference. For example, it may include allowing powerful dehumidification and automatic dehumidification, allowing only automatic dehumidification, or disabling any dehumidification. This judgment mechanism effectively prevents a decrease in heating performance caused by forced dehumidification when the temperature difference is insufficient.

[0038] Step S3: Determine the target dehumidification mode based on the indoor relative humidity and the allowed dehumidification mode type.

[0039] Within the feasible range defined in step S2, this step further selects the specific dehumidification intensity based on the humidity level. If the humidity is significantly high and the system allows for powerful dehumidification, a high-intensity dehumidification strategy is selected; if the humidity is slightly high but only mild intervention is allowed, a mild dehumidification mode is activated. For example, when the relative humidity reaches 70% and the system allows for powerful dehumidification, the target mode is powerful dehumidification; if the relative humidity is 50% and only automatic dehumidification is allowed, the target mode is automatic dehumidification. In this way, the above dual-criteria mechanism can ensure that the dehumidification action matches the actual needs, thereby avoiding over- or under-dehumidification.

[0040] Step S4: Based on the target dehumidification mode, control and adjust the operating parameters of the air conditioner. In the target dehumidification mode, one indoor heat exchanger acts as a heating heat exchanger to generate heat, and at least one other indoor heat exchanger acts as a dehumidification heat exchanger to dehumidify. The operating parameters include at least the opening degree of the outdoor expansion valve 5 and the opening degree of the indoor expansion valve 4.

[0041] It needs to be explained that this step executes specific control outputs. Taking two indoor heat exchangers, including a first indoor heat exchanger 31 and a second indoor heat exchanger 32, as an example, in the target dehumidification mode, the first indoor heat exchanger 31 continuously releases heat as a heating heat exchanger, while the second indoor heat exchanger 32 achieves condensation dehumidification by throttling and cooling. The system adjusts the opening of the outdoor expansion valve 5 and the indoor expansion valve 4 accordingly to control the refrigerant flow distribution and evaporation temperature. For example, increasing the opening of the outdoor expansion valve 5 increases the total amount of refrigerant entering the indoor side, while adjusting the indoor expansion valve 4 directly affects the evaporation pressure and coil temperature of the second heat exchanger. It can be understood that the above adjustments directly determine the balance between dehumidification capacity and outlet air temperature.

[0042] In related technologies, conventional air conditioners struggle to effectively dehumidify in heating mode. This is because during heating, the indoor heat exchanger operates at a high temperature, with its surface temperature far exceeding the dew point of the indoor air, preventing condensation and thus hindering dehumidification. Some solutions attempt to switch to cooling / dehumidification mode before resuming heating, but this causes a sharp drop in outlet air temperature, compromising indoor thermal comfort. Other solutions attempt to balance heating and dehumidification by reducing compressor frequency or bypassing some refrigerant, but these often result in significant reductions in heating capacity, slow response times, or low dehumidification efficiency, failing to meet users' actual needs in high-humidity, cold environments. Therefore, achieving efficient and continuous dehumidification while maintaining stable heating performance remains a long-standing technical challenge.

[0043] Therefore, in order to solve the technical defects existing in the above-mentioned related technologies, this invention proposes a dehumidification control method based on a dual indoor heat exchanger structure. By introducing a dual criterion mechanism of temperature difference and humidity, the appropriate dehumidification mode is dynamically selected, and the opening of the outdoor expansion valve 5 and the indoor expansion valve 4 are adjusted in a coordinated manner, so that the two indoor heat exchangers respectively undertake the functions of heating and dehumidification, thereby achieving efficient humidity control without interrupting heating or producing cold air.

[0044] Specifically, firstly, the first indoor heat exchanger 31 serves as the main heating component, ensuring a continuous release of heat into the room. Simultaneously, the refrigerant is throttled by the indoor expansion valve 4 located between the two heat exchangers, significantly reducing the refrigerant pressure and temperature in the second indoor heat exchanger 32. This allows the surface temperature to be stably maintained below the dew point, thus enabling continuous condensation and dehumidification. Secondly, the system determines the current heating capacity based on the difference between the indoor temperature and the target temperature, deciding whether to allow entry into dehumidification mode and the permissible intensity level, avoiding weakening the heating effect when there is a strong demand for temperature increases. Thirdly, considering the indoor relative humidity level, a matching dehumidification mode is selected within the permissible range, and the opening ratio of the outdoor expansion valve 5 and the indoor expansion valve 4 is set accordingly to precisely control the refrigerant distribution, ensuring that the coil temperature of the dehumidifying heat exchanger remains within the effective dehumidification range. This ensures both the stability of the outlet air temperature and on-demand dehumidification, resolving the fundamental contradiction of conflicting heating and dehumidification in traditional solutions.

[0045] In summary, through the synergistic innovation of structure and control logic, this invention achieves physical separation and dynamic balance of heating and dehumidification functions in a single heating cycle. Thus, without switching operating modes, it can efficiently and continuously reduce air humidity while maintaining indoor heating or constant temperature, significantly improving thermal comfort and user experience in high humidity and cold environments. This overcomes the technical defects of existing technologies that dehumidification inevitably leads to colder air outlets or loss of heating capacity.

[0046] Furthermore, based on the above basic working principle, the specific working process of the present invention is illustrated below: After the air conditioner starts heating mode, compressor 1 begins to run. High-temperature, high-pressure gaseous refrigerant is guided through four-way valve 6 to the first indoor heat exchanger 31, releasing heat to heat the indoor air. The system continuously monitors the running time. When the heating operation reaches the preset duration and the operating status becomes stable, it enters the dehumidification control process.

[0047] At this time, the control system obtains the current indoor temperature as 17℃, the user-set target temperature as 22℃, and the indoor relative humidity as 68%. The calculated difference between the indoor temperature and the target temperature is -5℃. According to the preset criteria, this difference equals the first preset temperature threshold, therefore the system determines that entering the powerful dehumidification mode and the automatic dehumidification mode is allowed. Next, the system calculates that the difference between the indoor relative humidity and the reference humidity value is 23%, which is greater than the first set percentage, and powerful dehumidification is currently allowed, so the final target dehumidification mode is determined to be the powerful dehumidification mode.

[0048] Upon entering the powerful dehumidification mode, the control system synchronously adjusts the openings of the outdoor expansion valve 5 and the indoor expansion valve 4. The opening of the outdoor expansion valve 5 is adjusted to a higher proportion of the reference opening to increase the overall refrigerant circulation; the opening of the indoor expansion valve 4 is set to a lower proportion of the outdoor expansion valve 5 opening, allowing the refrigerant flowing through the second indoor heat exchanger 32 to be fully throttled and depressurized. As a result, the first indoor heat exchanger 31 maintains a high-temperature heat release state, continuously providing heating capacity; due to the decrease in evaporation temperature, the surface temperature of the coils in the second indoor heat exchanger 32 drops to approximately 11°C, below the current air dew point temperature, and moisture is effectively condensed and precipitated when the return airflow passes through.

[0049] Meanwhile, the fan mixes the airflow heated by the first heat exchanger with the airflow dehumidified and cooled by the second heat exchanger within the duct, ensuring that the temperature of the delivered air remains within a comfortable range. Throughout the process, the heating function remains uninterrupted, the airflow is not noticeably cold, and the indoor humidity continues to decrease. When the humidity drops to the set level or the heating demand changes, the system can dynamically exit or switch to dehumidification mode, achieving intelligent and coordinated control throughout the entire process.

[0050] In summary, the dehumidification control method of this invention can achieve efficient and stable dehumidification during continuous heating of the air conditioner, while avoiding a sudden drop in outlet air temperature or a significant decrease in heating capacity. It can be understood that by introducing a dual-indoor heat exchanger structure and multi-parameter collaborative control logic, the system can adjust the dehumidification intensity as needed without switching operating modes or producing cold air, effectively balancing indoor thermal comfort and humidity control requirements, and significantly improving the user experience in high-humidity and cold environments.

[0051] Specifically, firstly, the indoor unit adopts a structure with a first indoor heat exchanger 31, an indoor expansion valve 4, and a second indoor heat exchanger 32 connected in sequence. This allows the first heat exchanger to continuously release heat as a high-temperature heating component during the heating cycle, while the second heat exchanger, after throttling, maintains a low-temperature state for condensation and dehumidification. This physically separates the heating and dehumidification functions, resolving the inherent contradiction that a single heat exchanger cannot simultaneously satisfy both high-temperature heat release and low-temperature dehumidification. Secondly, this invention first determines the permissible dehumidification mode type by judging the difference between the indoor temperature and the target temperature, and then combines this with the indoor relative humidity to determine the final target dehumidification mode, forming a dual-criteria mechanism. This ensures that dehumidification is only activated when the system has sufficient heating capacity and the humidity is indeed high, avoiding ineffective or excessive dehumidification. Finally, based on the target dehumidification mode, the opening of the outdoor expansion valve 5 and the indoor expansion valve 4 are coordinated and adjusted to precisely control the refrigerant distribution ratio between the two heat exchangers, ensuring that the coil temperature of the dehumidification heat exchanger remains stable within the effective dehumidification range, guaranteeing both dehumidification efficiency and maintaining stable outlet air temperature.

[0052] like Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the permitted dehumidification mode types include powerful dehumidification mode and automatic dehumidification mode; the step of determining the permitted dehumidification mode type based on the indoor temperature and the target temperature includes: When the difference between the indoor temperature and the target temperature is greater than or equal to the first preset temperature, the powerful dehumidification mode and the automatic dehumidification mode are allowed to be entered. If the difference between the indoor temperature and the target temperature is less than the first preset temperature but greater than or equal to the second preset temperature, only the automatic dehumidification mode is allowed. If the difference between the indoor temperature and the target temperature is less than the second preset temperature, it is prohibited to enter any dehumidification mode.

[0053] It is understood that this embodiment uses a tiered threshold for temperature difference to finely control the activation conditions of the dehumidification function, thereby ensuring that the dehumidification operation is always based on the system having sufficient heating capacity.

[0054] Specifically, the difference between the indoor temperature and the target temperature reflects the intensity of the room's current heating demand. When this difference is large (i.e., the room temperature is much lower than the set value), it indicates that the system needs to operate at full capacity for heating. If dehumidification is activated at this time, the heating output may be weakened due to refrigerant diversion or a decrease in evaporation temperature, resulting in cooler airflow or slow heating. Therefore, this embodiment sets two preset temperature thresholds to form a three-level access mechanism. When the temperature difference is small (greater than or equal to the first preset temperature, such as -5℃), it means that the room temperature is close to the target value, the heating load is low, and the system has sufficient margin to support the high-intensity powerful dehumidification mode and the gentle automatic dehumidification mode. When the temperature difference is moderate (between the first and second preset temperatures, such as -10℃ to -5℃), the system only allows the automatic dehumidification mode, which has a smaller impact on heating, to be activated. When the temperature difference is too large (less than the second preset temperature, such as below -10℃), dehumidification is completely prohibited, and rapid heating is prioritized.

[0055] For example, if the user sets the temperature to 22℃ and the actual room temperature is 18℃, the temperature difference is -4℃, which is greater than the first preset temperature of -5℃, the system determines that it can enter the strong or automatic dehumidification mode; if the room temperature is 16℃ and the temperature difference is -6℃, which is in the range of -10℃ to -5℃, then only automatic dehumidification will be turned on; if the room temperature is only 10℃ and the temperature difference reaches -12℃, then any dehumidification operation will be prohibited, and the air conditioner will focus on heating.

[0056] In this way, the above mechanism effectively avoids the problem of reduced heating performance or cold air output caused by forced dehumidification when the temperature difference is insufficient. It makes the activation of the dehumidification function match the actual thermal state of the system, thereby introducing dehumidification capacity as needed and safely while ensuring the basic heating effect, thus improving the rationality of the overall operation and user comfort.

[0057] Further, the step of determining the target dehumidification mode based on the indoor relative humidity and the permissible dehumidification mode type includes: If the difference between the indoor relative humidity and the reference humidity value is greater than or equal to the first set percentage, and the allowed dehumidification mode type includes the powerful dehumidification mode, then the target dehumidification mode is determined to be the powerful dehumidification mode. If the difference between the indoor relative humidity and the reference humidity value is less than a first set percentage and greater than or equal to zero, and the allowed dehumidification mode type includes automatic dehumidification mode, then the target dehumidification mode is determined to be automatic dehumidification mode. If the difference between the indoor relative humidity and the reference humidity value is less than zero, or if the air conditioner is prohibited from entering any dehumidification mode, the air conditioner will be controlled to maintain the heating mode.

[0058] It is understood that this embodiment, within the defined dehumidification access range, further precisely matches the dehumidification intensity based on the indoor humidity level to ensure that the dehumidification action is consistent with the actual environmental needs and avoids excessive intervention or insufficient response.

[0059] Specifically, the system uses a baseline humidity value (e.g., 45%) as a reference to calculate the difference between the current indoor relative humidity and this value. If the difference is large (greater than or equal to a first set percentage, such as 20%), it indicates that the air is significantly humid and there is a significant need for dehumidification. In this case, if step S2 has allowed entry into the powerful dehumidification mode, the system selects the powerful dehumidification mode to efficiently and quickly reduce humidity. If the humidity is high but has not reached the powerful dehumidification threshold (difference between 0 and the first set percentage), and the system allows automatic dehumidification, the automatic dehumidification mode is activated for gentle and continuous humidity adjustment. When the indoor humidity is already below the baseline value (difference less than zero), it indicates that the environment is not humid and dehumidification is not required; or when step S2 determines that any dehumidification mode is prohibited, the system maintains normal heating operation regardless of the humidity level and does not perform any dehumidification operation.

[0060] For example, if the baseline humidity is 45% and the measured humidity is 70%, the difference is 25%, which exceeds the 20% threshold, and the current temperature difference allows for strong dehumidification, then strong dehumidification will be activated; if the measured humidity is 55%, the difference is 10%, which is in the 0 to 20% range, and automatic dehumidification is allowed, then automatic dehumidification mode will be activated; if the humidity is 40%, the difference is -5%, and even if the temperature difference conditions are met, the system will not activate dehumidification.

[0061] In this way, by combining humidity deviation with the authorized mode type for secondary judgment, the mechanism realizes on-demand dehumidification, that is, the dehumidification function of the corresponding intensity is activated only when it is really needed and the system is capable. This prevents energy waste caused by ineffective operation in dry environments and avoids insufficient dehumidification due to mode limitations in high humidity environments, thereby improving the accuracy of control and energy efficiency.

[0062] like Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the step of controlling and adjusting the operating parameters of the air conditioner based on the target dehumidification mode includes: Control the opening degree of indoor expansion valve 4 and / or outdoor expansion valve 5 according to the target dehumidification mode.

[0063] This embodiment achieves dynamic adjustment of air conditioning operating parameters by adjusting the opening degree of indoor expansion valve 4 and / or outdoor expansion valve 5.

[0064] In the dual heat exchanger architecture of this invention, the indoor expansion valve 4 is located between the first indoor heat exchanger 31 and the second indoor heat exchanger 32. Its opening degree directly affects the degree of refrigerant throttling entering the second indoor heat exchanger 32 (which serves as a dehumidification heat exchanger), thereby controlling its evaporation temperature and dehumidification capacity. The outdoor expansion valve 5 regulates the total refrigerant flow from the outdoor unit to the indoor side, affecting the overall heating output and cycle stability. Based on the determined target dehumidification mode (such as strong or automatic), the control system sets a corresponding valve opening strategy.

[0065] For example, when stronger dehumidification is required, the opening of the outdoor expansion valve 5 can be increased to improve the circulation volume, while the opening of the indoor expansion valve 4 can be reduced to enhance the throttling effect, resulting in a lower temperature of the second heat exchanger coil. Under mild dehumidification requirements, a relatively mild valve position combination is used to balance energy efficiency and comfort.

[0066] It is understood that in this embodiment, by adjusting the indoor expansion valve 4 and / or the outdoor expansion valve 5, continuous control of dehumidification intensity can be achieved without changing the operating state of the compressor 1 or switching the four-way valve 6. This method is simple in structure, reliable in control, and avoids the fluctuations in outlet air temperature or system shocks caused by mode switching in traditional solutions.

[0067] In some specific embodiments, the step of controlling and adjusting the opening degree of the indoor expansion valve 4 and / or the outdoor expansion valve 5 according to the target dehumidification mode includes: In automatic dehumidification mode, the opening of the outdoor expansion valve 5 is increased to a level greater than the first preset ratio, and the opening of the indoor expansion valve 4 is set to the second preset ratio of the opening of the outdoor expansion valve 5. In the powerful dehumidification mode, the opening of the outdoor expansion valve 5 is increased to a level greater than the third preset ratio, and the opening of the indoor expansion valve 4 is set to the fourth preset ratio of the opening of the outdoor expansion valve 5.

[0068] Among them, the first preset ratio is greater than 1, the third preset ratio is greater than the first preset ratio, and the fourth preset ratio is less than the second preset ratio.

[0069] This embodiment achieves differentiated control of refrigerant distribution by setting the proportional relationship of the expansion valve opening under different dehumidification modes, thereby matching dehumidification needs of different intensities.

[0070] In automatic dehumidification mode, the system aims to maintain basic comfort with moderate dehumidification intensity. At this time, the opening of the outdoor expansion valve 5 is increased to a first preset ratio (e.g., 1.5 times) of the reference opening to moderately increase the total refrigerant circulation. At the same time, the opening of the indoor expansion valve 4 is set to a second preset ratio (e.g., 1.4 times) of the outdoor expansion valve 5, so that the refrigerant entering the second indoor heat exchanger 32 is moderately throttled, and the coil temperature is slightly lower than the dew point, achieving gentle dehumidification and avoiding excessive cooling of the airflow from affecting the outlet air temperature.

[0071] In high-power dehumidification mode, the system needs to quickly reduce humidity in high-humidity environments, thus employing a stronger control strategy. The opening of the outdoor expansion valve 5 is further increased to a third preset ratio (e.g., 1.7 times) greater than the first preset ratio, significantly increasing the refrigerant flow rate; while the opening of the indoor expansion valve 4 is set to a fourth preset ratio of the outdoor expansion valve 5 opening, and this ratio is less than the second preset ratio (e.g., 1.3 times). This setting causes the refrigerant flowing through the indoor expansion valve 4 to undergo a greater throttling and pressure reduction, resulting in a lower evaporation temperature in the second indoor heat exchanger 32, making it easier for the coil surface to reach deep condensation conditions, thereby significantly increasing the dehumidification capacity.

[0072] In this way, the larger opening of the outdoor expansion valve 5 ensures sufficient refrigerant supply to support high-intensity dehumidification, while the smaller opening of the indoor expansion valve 4 enhances the throttling effect, allowing the dehumidifying heat exchanger to operate in a lower temperature range. This synergistic cooperation ensures that the dehumidification capacity in different modes matches the system's heat load. For example, when humidity is high but the room temperature is close to the set value, the powerful mode can be activated for rapid dehumidification without causing the exhaust air to be too cold; while when humidity is slightly high and heating capacity is limited, the automatic mode balances energy efficiency and comfort. In summary, the above strategy effectively achieves graded control of dehumidification intensity, improving the system's adaptability and operating efficiency under different conditions.

[0073] like Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, after the step of controlling and adjusting the opening degree of the indoor expansion valve 4 and / or the outdoor expansion valve 5 according to the target dehumidification mode, the method further includes: The dehumidification coil temperature of the dehumidification heat exchanger is monitored in real time, and the corresponding coil temperature control strategy is executed according to the target dehumidification mode and the dehumidification coil temperature: In the powerful dehumidification mode, in response to the dehumidification coil temperature being higher than the first target temperature range, the opening of the indoor expansion valve 4 is reduced; or, in response to the dehumidification coil temperature being lower than the first target temperature range, the opening of the indoor expansion valve 4 is increased; or, in response to the dehumidification coil temperature being within the first target temperature range, the opening of the indoor expansion valve 4 is kept unchanged. In automatic dehumidification mode, the dew point temperature is calculated based on the indoor temperature and indoor relative humidity, and a second target temperature range is determined based on the dew point temperature. In response to the dehumidification coil temperature being higher than the second target temperature range, the opening of the indoor expansion valve 4 is reduced; or, in response to the dehumidification coil temperature being lower than the second target temperature range, the opening of the indoor expansion valve 4 is increased; or, in response to the dehumidification coil temperature being within the second target temperature range, the opening of the indoor expansion valve 4 is kept unchanged.

[0074] It should be explained that, based on the initial setting of the expansion valve opening, this embodiment introduces closed-loop feedback control based on the dehumidification coil temperature, which further improves the stability and accuracy of the dehumidification process. By monitoring the coil temperature of the second indoor heat exchanger 32 (i.e., the dehumidification heat exchanger) in real time and dynamically adjusting the opening of the indoor expansion valve 4 in combination with the current dehumidification mode, the coil temperature is ensured to always be maintained within the effective dehumidification range, thereby avoiding the risk of dehumidification failure or frosting due to fluctuations in operating conditions.

[0075] In high-power dehumidification mode, the system uses a fixed target temperature range as the control benchmark. For example, this range can be set to 10℃ to 12℃. When the detected coil temperature is higher than the upper limit of this range, it indicates insufficient throttling, a high evaporation temperature, and weakened condensation capacity. In this case, the opening of the indoor expansion valve 4 is reduced to enhance throttling and lower the coil temperature. When the coil temperature is lower than the lower limit of the range, there may be excessive throttling or insufficient refrigerant flow, which can easily lead to frosting. In this case, the opening of the indoor expansion valve 4 is increased to increase the evaporation pressure and raise the temperature. If the coil temperature is already within the target range, the current valve position is maintained to ensure stable operation. This strategy is suitable for high-humidity scenarios with strong dehumidification requirements, achieving rapid and stable deep dehumidification through a fixed temperature zone.

[0076] In automatic dehumidification mode, the system employs a more flexible dynamic target temperature range. This range is based on a lower limit (e.g., 10℃), with the upper limit determined by subtracting a safety margin (e.g., 3℃) from the dew point temperature calculated from the current indoor temperature and relative humidity. For example, when the indoor temperature is 20℃ and the relative humidity is 60%, the dew point temperature is approximately 12℃, so the second target temperature range is 10℃ to 9℃. This design ensures that the coil temperature is always slightly lower than the actual dew point, effectively condensing moisture while avoiding excessive cooling or increased energy consumption due to large temperature differences. Similarly, based on the relative relationship between the coil temperature and this dynamic range, the system adjusts the opening of the indoor expansion valve 4 accordingly, achieving on-demand, adaptive dehumidification control.

[0077] Thus, through the aforementioned dual-mode coil temperature control strategy, the system not only ensures high dehumidification efficiency in high-power mode, but also intelligently adjusts the target temperature zone according to changes in ambient humidity in automatic mode, balancing energy efficiency and anti-frost safety. This closed-loop mechanism significantly enhances control stability, ensuring reliable and efficient dehumidification performance under various climatic conditions and operating states.

[0078] like Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, a rotatable air guide plate 7 is provided in the air outlet duct 71 of the indoor unit. The air guide plate 7 is configured to adjust the distribution ratio of airflow between the first indoor heat exchanger 31 and the second indoor heat exchanger 32. Therefore, after the step of controlling and adjusting the operating parameters of the air conditioner based on the target dehumidification mode, the method further includes: Get the current outlet air temperature and indoor temperature; The temperature control logic under heating mode is determined based on the indoor temperature and the target temperature. Under the temperature control logic, the rotation angle of the air guide plate 7 is controlled and adjusted according to the outlet air temperature and the indoor temperature.

[0079] Specifically, when the difference between the indoor temperature and the target temperature is greater than or equal to the set temperature, the temperature control logic is constant temperature control logic; or, when the difference between the indoor temperature and the target temperature is less than the set temperature, the temperature control logic is heating control logic; the set temperature is less than or equal to zero.

[0080] This embodiment, through the coordinated control of the air guide plate 7, further optimizes the airflow distribution from the air side on the basis of completing the refrigerant-side valve control regulation, so as to balance the stability of the outlet air temperature and the dehumidification efficiency. The air guide plate 7 is set in the indoor unit's air outlet duct 71. Its rotation can change the airflow ratio through the first indoor heat exchanger 31 (heating heat exchanger) and the second indoor heat exchanger 32 (dehumidifying heat exchanger), thereby affecting the temperature and humidity characteristics of the final mixed outlet air.

[0081] After executing valve-controlled regulation, the system obtains the current outlet air temperature and indoor temperature, and determines the current heating stage by combining the difference between the indoor temperature and the target temperature. If the difference is greater than or equal to the set temperature (e.g., -2℃), it indicates that the room temperature has approached or reached the set value, and the system enters the constant temperature control logic. At this time, the main goal is to maintain a stable and comfortable outlet air temperature. If the difference is less than the set temperature (e.g., the room temperature is significantly lower), it is determined to be in the temperature rise control logic, prioritizing the ability to quickly raise the temperature.

[0082] Based on this, the system dynamically adjusts the angle of the air guide vane 7 according to the difference between the outlet air temperature and the indoor temperature. For example, under constant temperature control logic, if the outlet air temperature is too high, it indicates that too much airflow is passing through the high-temperature heat exchanger. The angle of the air guide vane 7 can be reduced to guide more airflow through the low-temperature dehumidifying heat exchanger for cooling, thereby lowering the outlet air temperature. Conversely, if the outlet air temperature is too low, the angle of the air guide vane 7 is increased to increase the airflow passing through the heating heat exchanger to raise the outlet air temperature. Under heating control logic, the system allows for a higher outlet air temperature rise, thus resulting in a wider temperature control range. The adjustment strategy of the air guide vane 7 is adjusted accordingly to ensure sufficient heat output while retaining the necessary dehumidification capacity.

[0083] In this way, the above mechanism achieves precise control of the air outlet state through the dual coordination of the air side and the refrigerant side. Among them, the air guide plate 7, as the airflow distribution actuator, directly responds to the thermal comfort requirements, effectively making up for the limitation that valve control alone cannot fully balance the contradiction between heating and dehumidification, so that the system can output a temperature and humidity environment that meets the user's expectations at different operating stages.

[0084] Furthermore, under the temperature control logic, the steps of controlling and adjusting the rotation angle of the air guide vane 7 based on the outlet air temperature and the indoor temperature include: Under constant temperature control logic, if the difference between the outlet air temperature and the indoor temperature is higher than the first temperature difference range, the angle of the air guide plate 7 is adjusted to reduce the proportion of airflow flowing through the heat exchanger in the heating room; if the difference between the outlet air temperature and the indoor temperature is lower than the first temperature difference range, the angle of the air guide plate 7 is adjusted to increase the proportion of airflow flowing through the heat exchanger in the heating room; if the difference between the outlet air temperature and the indoor temperature is within the first temperature difference range, the angle of the air guide plate 7 is kept unchanged. Under the heating control logic, if the difference between the outlet air temperature and the indoor temperature is higher than the second temperature difference range, the angle of the air guide plate 7 is adjusted to reduce the proportion of airflow flowing through the heat exchanger in the heating room; if the difference between the outlet air temperature and the indoor temperature is lower than the second temperature difference range, the angle of the air guide plate 7 is adjusted to increase the proportion of airflow flowing through the heat exchanger in the heating room; if the difference between the outlet air temperature and the indoor temperature is within the second temperature difference range, the angle of the air guide plate 7 is kept unchanged. The first temperature difference range is smaller than the second temperature difference range.

[0085] This embodiment further refines the adjustment strategy of the air guide plate 7 under different temperature control logics. By setting differentiated target ranges for outlet air temperature difference, the airflow distribution control is matched with the core requirements of the current heating stage.

[0086] Under constant temperature control logic, the system prioritizes maintaining stable indoor temperature and comfortable airflow, therefore a narrow first temperature difference range is used as the control benchmark. For example, this range corresponds to an airflow temperature 5°C to 9°C higher than the room temperature. When the difference between the airflow temperature and the indoor temperature is detected to be higher than the upper limit of this range, it indicates that the airflow is overheated, which may cause localized dryness. In this case, the angle of the air guide plate 7 is reduced, allowing more airflow to bypass the high-temperature first indoor heat exchanger 31 (heating heat exchanger) and instead flow through the low-temperature second indoor heat exchanger 32 (dehumidifying heat exchanger) for cooling, thereby reducing the mixed airflow temperature. If the difference is lower than the lower limit of the range, the angle of the air guide plate 7 is increased to increase the airflow through the heating heat exchanger and raise the airflow temperature. If the difference is within the range, the angle of the air guide plate 7 is kept unchanged to maintain the current airflow distribution.

[0087] Under the temperature rise control logic, the system prioritizes rapidly raising the room temperature, allowing for higher outlet air temperatures to enhance the heating effect. Therefore, a wider and generally higher second temperature difference range is adopted, for example, corresponding to an outlet air temperature rise of 15°C to 19°C. At this time, even if the outlet air temperature is significantly higher than the room temperature, as long as it does not exceed this wide range, the system will maintain the current air guide vane opening at 7 degrees to ensure maximum heating output. Only when the outlet air temperature is too high (exceeding the upper limit of the range) will the airflow through the heating heat exchanger be appropriately reduced to prevent overheating; or when the outlet air temperature is insufficient (below the lower limit of the range), the airflow on the heating side will be further increased to enhance the temperature rise capability.

[0088] It is understandable that, since the first temperature difference range is smaller than the second temperature difference range, the system is more sensitive and precise in controlling the outlet air temperature during the constant temperature stage, while it is more tolerant during the heating stage, focusing on heat output.

[0089] In summary, the aforementioned phased and differentiated target setting enables the adjustment of the air guide plate 7 to not only meet the requirements for continuous dehumidification in high humidity environments, but also flexibly adapt to the thermal management needs of the entire process from rapid heating to stable constant temperature, thereby effectively improving the overall performance of the unit under complex working conditions and the user comfort experience.

[0090] The following describes a specific embodiment of the dehumidification control method of the present invention.

[0091] like Figure 1 and Figure 2As shown, this embodiment discloses a dehumidification control method for an air conditioner, applicable to an air conditioning system with a dual indoor heat exchanger structure. The system includes an indoor unit and an outdoor unit. The indoor unit is equipped with a first indoor heat exchanger 31, an indoor expansion valve 4, and a second indoor heat exchanger 32 connected in sequence to achieve coordinated operation of heating and dehumidification functions. The outdoor unit includes a compressor 1, an outdoor heat exchanger 2, and an outdoor electronic expansion valve (i.e., outdoor expansion valve 5). The first indoor heat exchanger 31 serves as a heating heat exchanger, and the second indoor heat exchanger 32 serves as a dehumidification heat exchanger, connected to each other via the indoor electronic expansion valve (i.e., indoor expansion valve 4). An air guide plate 7, driven by a stepper motor, is also provided in the indoor unit's air outlet duct 71 to adjust the airflow ratio through the two indoor heat exchangers. The air outlet duct 71 connects to the air outlet 72.

[0092] After the air conditioner is turned on, it enters heating mode. When the running time reaches 3 minutes, the control system begins to collect the current indoor relative humidity. The system monitors the indoor ambient temperature Tao and the user-set temperature Ts, and continuously monitors changes in these parameters.

[0093] First, the difference between Tao and Ts determines whether to enter dehumidification mode. If Tao-Ts ≥ 10℃, it is determined that the current room temperature is far below the set value, the system is in a stage of strong heating demand, and dehumidification mode is not entered, maintaining normal heating operation; if -10℃ ≤ Tao-Ts < 10℃, the humidity condition is further assessed; if Tao-Ts < -10℃, it is determined that the system is close to the target temperature, and dehumidification mode is allowed.

[0094] Provided that the entry conditions are met, further consideration should be given to the indoor relative humidity. Determine the specific dehumidification mode. If If the humidity is ≥45% and Tao-Ts ≥-5℃, then powerful dehumidification and automatic dehumidification are permitted; if <45% but If the humidity is ≥20%, then automatic dehumidification is allowed only; if If the humidity is less than 20%, dehumidification will not be performed.

[0095] After determining that dehumidification mode can be entered, the system performs a detection. The difference from the baseline humidity value (e.g., 45%). If If -45% ≥ 20% and powerful dehumidification is allowed, then the powerful dehumidification mode will be activated; if 0 ≤ If -45% < 20% and automatic dehumidification is allowed, then enter automatic dehumidification mode; otherwise, maintain heating operation.

[0096] After entering dehumidification mode, the system adjusts the opening of the outdoor and indoor electronic expansion valves according to the target mode. In strong dehumidification mode, the opening of the outdoor electronic expansion valve is set to 1.7 times the reference value, and the initial opening of the indoor electronic expansion valve is set to 1.3 times the outdoor opening. In automatic dehumidification mode, the opening of the outdoor electronic expansion valve is set to 1.5 times the reference value, and the initial opening of the indoor electronic expansion valve is set to 1.4 times the outdoor opening.

[0097] Subsequently, the system monitors the temperature Tp of coil 32 in the second indoor heat exchanger in real time. In powerful dehumidification mode, if Tp > 12℃, the indoor electronic expansion valve closes in 5 steps with a 5-second closing cycle; if Tp ≤ 12℃ and Tp > 10℃, it opens in 2 steps with a 5-second opening cycle; if 10℃ ≤ Tp ≤ 12℃, the current opening degree remains unchanged. In automatic dehumidification mode, if Tp > (Ts - 3)℃, it closes in 5 steps with a 5-second closing cycle; if Tp ≤ (Ts - 3)℃ and Tp > 10℃, it opens in 5 steps with a 5-second opening cycle; if 10℃ ≤ Tp ≤ (Ts - 3)℃, the opening degree remains unchanged.

[0098] Simultaneously, the system acquires the outlet air temperature Tc and the indoor temperature Tao, and determines the temperature control logic based on Tao-Ts. If Tao-Ts ≥ -2℃, it enters the constant temperature control logic; if Tao-Ts < -2℃, it enters the heating control logic.

[0099] Under constant temperature control logic, if Tc-Tao>9℃, the air guide plate 7 will close 10 steps each time for 1 minute; if Tc-Tao<5℃, the air guide plate 7 will open 5 steps each time for 1 minute; if 5℃≤Tc-Tao≤9℃, the opening of the air guide plate 7 will remain unchanged.

[0100] Under the temperature control logic, if Tc-Tao>19℃, the air guide plate 7 will close 10 steps each time for 1 minute; if Tc-Tao<15℃, the air guide plate 7 will open 5 steps each time for 1 minute; if 15℃≤Tc-Tao≤19℃, the opening of the air guide plate 7 will remain unchanged.

[0101] The above control process achieves a dynamic balance between dehumidification intensity and outlet air temperature during heating through multi-level criteria and closed-loop feedback, taking into account both thermal comfort and dehumidification efficiency.

[0102] The dehumidification control device for an air conditioner provided by the present invention will be described below. The dehumidification control device for an air conditioner described below can be referred to in correspondence with the dehumidification control method for an air conditioner described above.

[0103] like Figure 5 As shown, the dehumidification control device for an air conditioner according to a second aspect embodiment of the present invention includes: The first acquisition module 110 is used to acquire the indoor temperature, target temperature and indoor relative humidity after the air conditioner has been running in heating mode for a preset time. The second acquisition module 120 is used to determine the type of dehumidification mode that can be entered based on the indoor temperature and the target temperature; The third acquisition module 130 is used to determine the target dehumidification mode based on the indoor relative humidity and the allowed dehumidification mode type. The control module 140 is used to control and adjust the operating parameters of the air conditioner based on the target dehumidification mode. In the target dehumidification mode, one indoor heat exchanger acts as a heating heat exchanger to generate heat, and at least another indoor heat exchanger acts as a dehumidification heat exchanger to dehumidify. The operating parameters include at least the opening degree of the outdoor expansion valve 5 and the opening degree of the indoor expansion valve 4.

[0104] The present invention also protects an air conditioner, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The indoor unit of the air conditioner includes two indoor heat exchangers connected in sequence and an indoor expansion valve 4 located between the two indoor heat exchangers. The outdoor unit includes an outdoor expansion valve 5. When the processor executes the program, it implements the steps of the dehumidification control method of the air conditioner as described in the first aspect of the present invention.

[0105] Figure 6 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 6 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 can call logical instructions in the memory 830 to execute a dehumidification control method for the air conditioner, including: after the air conditioner has been running in heating mode for a preset time, acquiring the indoor temperature, target temperature, and indoor relative humidity; determining the allowed dehumidification mode type based on the indoor temperature and the target temperature; determining the target dehumidification mode based on the indoor relative humidity and the allowed dehumidification mode type; and controlling and adjusting the operating parameters of the air conditioner based on the target dehumidification mode, wherein, in the target dehumidification mode, one indoor heat exchanger acts as a heating heat exchanger for heating, and at least another indoor heat exchanger acts as a dehumidification heat exchanger for dehumidification; the operating parameters include at least the opening degree of the outdoor expansion valve 5 and the opening degree of the indoor expansion valve 4.

[0106] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0107] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by the computer, the computer is able to execute the dehumidification control method for an air conditioner provided by the above methods, including: after the air conditioner has been running in heating mode for a preset time, acquiring indoor temperature, target temperature, and indoor relative humidity; determining the allowed dehumidification mode type based on the indoor temperature and target temperature; determining a target dehumidification mode based on the indoor relative humidity and the allowed dehumidification mode type; and controlling and adjusting the operating parameters of the air conditioner based on the target dehumidification mode, wherein, in the target dehumidification mode, one indoor heat exchanger acts as a heating heat exchanger for heating, and at least another indoor heat exchanger acts as a dehumidification heat exchanger for dehumidification; the operating parameters include at least the opening degree of the outdoor expansion valve 5 and the opening degree of the indoor expansion valve 4.

[0108] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the dehumidification control methods of the air conditioner provided above, including: after the air conditioner has been running in heating mode for a preset time, acquiring indoor temperature, target temperature, and indoor relative humidity; determining the permissible dehumidification mode type based on the indoor temperature and target temperature; determining a target dehumidification mode based on the indoor relative humidity and the permissible dehumidification mode type; and controlling and adjusting the operating parameters of the air conditioner based on the target dehumidification mode, wherein, in the target dehumidification mode, one indoor heat exchanger acts as a heating heat exchanger for heating, and at least another indoor heat exchanger acts as a dehumidification heat exchanger for dehumidification; the operating parameters include at least the opening degree of the outdoor expansion valve 5 and the opening degree of the indoor expansion valve 4.

[0109] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0110] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dehumidification control method for an air conditioner, characterized in that, The indoor unit of the air conditioner includes at least two indoor heat exchangers connected in sequence and an indoor expansion valve located between the two indoor heat exchangers; the outdoor unit includes an outdoor expansion valve; and the dehumidification control method includes: After the air conditioner has been running in heating mode for a preset time, the indoor temperature, target temperature, and indoor relative humidity are obtained. Based on the indoor temperature and the target temperature, determine the type of dehumidification mode that can be entered; Determine the target dehumidification mode based on the indoor relative humidity and the permissible dehumidification mode type; Based on the target dehumidification mode, the operating parameters of the air conditioner are controlled and adjusted. In the target dehumidification mode, one of the indoor heat exchangers acts as a heating heat exchanger to generate heat, and at least another indoor heat exchanger acts as a dehumidification heat exchanger to dehumidify. The operating parameters include at least the opening degree of the outdoor expansion valve and the opening degree of the indoor expansion valve.

2. The dehumidification control method for air conditioning according to claim 1, characterized in that, The permitted dehumidification mode types include powerful dehumidification mode and automatic dehumidification mode; the step of determining the permitted dehumidification mode type based on the indoor temperature and the target temperature includes: When the difference between the indoor temperature and the target temperature is greater than or equal to the first preset temperature, the powerful dehumidification mode and the automatic dehumidification mode are allowed to be entered. If the difference between the indoor temperature and the target temperature is less than the first preset temperature and greater than or equal to the second preset temperature, the automatic dehumidification mode is allowed to be entered only. If the difference between the indoor temperature and the target temperature is less than the second preset temperature, entering any dehumidification mode is prohibited.

3. The dehumidification control method for air conditioning according to claim 2, characterized in that, The step of determining the target dehumidification mode based on the indoor relative humidity and the permissible dehumidification mode type includes: If the difference between the indoor relative humidity and the reference humidity value is greater than or equal to a first set percentage, and the allowed dehumidification mode type includes a powerful dehumidification mode, then the target dehumidification mode is determined to be a powerful dehumidification mode. If the difference between the indoor relative humidity and the reference humidity value is less than a first set percentage and greater than or equal to zero, and the allowed dehumidification mode type includes automatic dehumidification mode, then the target dehumidification mode is determined to be automatic dehumidification mode. In response to the difference between the indoor relative humidity and the reference humidity value being less than zero, or the air conditioner being prohibited from entering any dehumidification mode, the air conditioner is controlled to maintain the heating mode unchanged.

4. The dehumidification control method for air conditioning according to claim 3, characterized in that, The step of controlling and adjusting the operating parameters of the air conditioner based on the target dehumidification mode includes: According to the target dehumidification mode, control and adjust the opening degree of the indoor expansion valve and / or the outdoor expansion valve.

5. The dehumidification control method for air conditioning according to claim 4, characterized in that, The step of controlling and adjusting the opening degree of the indoor expansion valve and / or the outdoor expansion valve according to the target dehumidification mode includes: In automatic dehumidification mode, the opening of the outdoor expansion valve is increased to a level greater than a first preset ratio, and the opening of the indoor expansion valve is set to a second preset ratio of the opening of the outdoor expansion valve. In the powerful dehumidification mode, the opening of the outdoor expansion valve is increased to a level greater than the third preset ratio, and the opening of the indoor expansion valve is set to the fourth preset ratio of the opening of the outdoor expansion valve. Wherein, the first preset ratio is greater than 1, the third preset ratio is greater than the first preset ratio, and the fourth preset ratio is less than the second preset ratio.

6. The dehumidification control method for air conditioning according to claim 4, characterized in that, After the step of controlling and adjusting the opening degree of the indoor expansion valve and / or the outdoor expansion valve according to the target dehumidification mode, the method further includes: The temperature of the dehumidification coil of the dehumidification heat exchanger is detected in real time, and the corresponding coil temperature control strategy is executed according to the target dehumidification mode and the dehumidification coil temperature. In the powerful dehumidification mode, in response to the dehumidification coil temperature being higher than the first target temperature range, the opening of the indoor expansion valve is reduced; or, in response to the dehumidification coil temperature being lower than the first target temperature range, the opening of the indoor expansion valve is increased; or, in response to the dehumidification coil temperature being within the first target temperature range, the opening of the indoor expansion valve remains unchanged. In automatic dehumidification mode, the dew point temperature is calculated based on the indoor temperature and the indoor relative humidity, and a second target temperature range is determined based on the dew point temperature; in response to the dehumidification coil temperature being higher than the second target temperature range, the opening of the indoor expansion valve is reduced; or, in response to the dehumidification coil temperature being lower than the second target temperature range, the opening of the indoor expansion valve is increased; or, in response to the dehumidification coil temperature being within the second target temperature range, the opening of the indoor expansion valve remains unchanged.

7. The dehumidification control method for an air conditioner according to any one of claims 1 to 6, characterized in that, The indoor unit has a rotatable air guide plate in its air outlet duct. The air guide plate is configured to adjust the airflow distribution ratio between the first indoor heat exchanger and the second indoor heat exchanger. After the step of controlling and adjusting the operating parameters of the air conditioner based on the target dehumidification mode, the method further includes: Get the current outlet air temperature and indoor temperature; Based on the indoor temperature and the target temperature, the temperature control logic under the heating mode is determined; Under the temperature control logic, the rotation angle of the air guide plate is controlled and adjusted according to the outlet air temperature and the indoor temperature. Wherein, if the difference between the indoor temperature and the target temperature is greater than or equal to the set temperature, the temperature control logic is a constant temperature control logic; or, if the difference between the indoor temperature and the target temperature is less than the set temperature, the temperature control logic is a heating control logic; wherein the set temperature is less than or equal to zero.

8. The dehumidification control method for an air conditioner according to claim 7, characterized in that, The step of controlling and adjusting the rotation angle of the air guide plate according to the outlet air temperature and the indoor temperature under the temperature control logic includes: Under the constant temperature control logic, in response to the difference between the outlet air temperature and the indoor temperature being higher than the first temperature difference range, the angle of the air guide plate is adjusted to reduce the proportion of airflow flowing through the heat exchanger in the heating room; in response to the difference between the outlet air temperature and the indoor temperature being lower than the first temperature difference range, the angle of the air guide plate is adjusted to increase the proportion of airflow flowing through the heat exchanger in the heating room; in response to the difference between the outlet air temperature and the indoor temperature being within the first temperature difference range, the angle of the air guide plate is kept unchanged. Under the heating control logic, in response to the difference between the outlet air temperature and the indoor temperature being higher than the second temperature difference range, the angle of the air guide plate is adjusted to reduce the proportion of airflow flowing through the heat exchanger in the heating room; in response to the difference between the outlet air temperature and the indoor temperature being lower than the second temperature difference range, the angle of the air guide plate is adjusted to increase the proportion of airflow flowing through the heat exchanger in the heating room; in response to the difference between the outlet air temperature and the indoor temperature being within the second temperature difference range, the angle of the air guide plate is kept constant. The first temperature difference range is smaller than the second temperature difference range.

9. A dehumidification control device for an air conditioner, characterized in that, The indoor unit of the air conditioner includes at least two indoor heat exchangers connected in sequence and an indoor expansion valve located between the two indoor heat exchangers; the outdoor unit includes an outdoor expansion valve; and the dehumidification control device includes: The first acquisition module is used to acquire the indoor temperature, target temperature and indoor relative humidity after the air conditioner has been running in heating mode for a preset time. The second acquisition module is used to determine the type of dehumidification mode that can be entered based on the indoor temperature and the target temperature; The third acquisition module is used to determine the target dehumidification mode based on the indoor relative humidity and the allowed dehumidification mode type. A control module is used to control and adjust the operating parameters of the air conditioner based on the target dehumidification mode, wherein, in the target dehumidification mode, one of the indoor heat exchangers acts as a heating heat exchanger to generate heat, and at least another indoor heat exchanger acts as a dehumidification heat exchanger to dehumidify; the operating parameters include at least the opening degree of the outdoor expansion valve and the opening degree of the indoor expansion valve.

10. An air conditioner, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The indoor unit of the air conditioner includes two indoor heat exchangers connected in sequence and an indoor expansion valve located between the two indoor heat exchangers. The outdoor unit includes an outdoor expansion valve. When the processor executes the program, it implements the steps of the dehumidification control method of the air conditioner as described in any one of claims 1 to 8.

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