Adaptive control method and device for dehumidifier

Abstract

The present disclosure provides a kind of adaptive adjustment control method and device of dehumidifier, obtains ambient temperature, ambient humidity, set humidity and condenser temperature;According to ambient temperature, ambient humidity and set humidity, the start and stop of compressor in dehumidifier are controlled;When compressor is in the state of start, according to the difference between ambient humidity and set humidity, the current state where dehumidifier is located is determined, and according to the current state and ambient temperature frequency reference curve, the target frequency of compressor is determined;Based on target frequency and condenser temperature, the target rotating speed of fan is determined, and the fan in dehumidifier is controlled to run according to fan target rotating speed.The way, according to real-time ambient temperature, humidity deviation and condenser temperature, adaptive adjustment compressor target frequency and fan rotating speed, make unit dynamic switching between fast dehumidification state and energy-saving stable humidity state, avoid approaching set humidity when invalid high-frequency operation, invalid condensing operation and fan overspeed operation.

Description

Technical Field

[0001] This disclosure relates to the field of variable frequency dehumidifier control technology, and in particular to an adaptive adjustment control method and device for a dehumidifier. Background Technology

[0002] In related technologies, the intelligent mode of variable frequency dehumidifiers often adopts a switch-type control of "starting when humidity exceeds the standard and stopping when humidity reaches the standard," or simply sets the compressor frequency according to a table based on the ambient temperature; the fan speed is often fixed at three levels: high, medium, and low, or only roughly bound to the actual compressor frequency. However, this method maintains high frequency operation for a long time during high humidity periods, and continues to maintain high power even after the set humidity is approached, resulting in high energy consumption; at the same time, starting and stopping only depends on a single humidity threshold, which easily leads to frequent short-cycle start-stop and humidity fluctuations. Summary of the Invention

[0003] In view of this, the purpose of this disclosure is to provide an adaptive adjustment control method and device for a dehumidifier, so as to reduce operating power consumption, reduce ineffective dehumidification and frequent start-stop while ensuring dehumidification effect.

[0004] In a first aspect, embodiments of this disclosure provide an adaptive adjustment and control method for a dehumidifier. The method includes: acquiring ambient temperature, ambient humidity, a set humidity, and a condenser temperature; and controlling the start and stop of the compressor in the dehumidifier based on the ambient temperature, ambient humidity, and set humidity; when the compressor is in the start state, determining the current state of the dehumidifier based on the difference between the ambient humidity and the set humidity, and acquiring an ambient temperature frequency reference curve; wherein the current state includes a rapid dehumidification state and an energy-saving stable humidity state; the ambient temperature frequency reference curve is determined based on a lower frequency limit curve, a higher frequency limit curve, an intelligent reference curve, and an energy-saving reference curve; and responding to the current... The current state is rapid dehumidification. The target frequency is determined based on the intelligent reference curve, and the energy-saving bias is gradually reduced according to a preset time period. Alternatively, in response to the current state being energy-saving and stable humidity, the target frequency is determined based on the intelligent reference curve, energy-saving bias, and fine-tuning bias. Among them, the energy-saving bias is determined based on the intelligent reference curve and the energy-saving reference curve; the fine-tuning bias is determined based on the energy-saving bias, the lower limit curve of the frequency, and the energy-saving reference curve. The target frequency is limited within the lower limit curve of the frequency and the upper limit curve of the frequency to obtain the final target frequency. Based on the final target frequency and the condenser temperature, the target fan speed is determined, and the fan in the dehumidifier is controlled to operate at the target fan speed.

[0005] In an optional embodiment, the steps of controlling the start and stop of the compressor in the dehumidifier based on the ambient temperature, ambient humidity, and set humidity include: determining the humidity deviation based on the difference between the ambient humidity and the set humidity; if the compressor is in a stopped state, controlling the compressor to start when the compressor meets the minimum shutdown time and the ambient temperature is within a first preset temperature range and the humidity deviation is greater than or equal to a first preset deviation threshold; if the compressor is in a started state, controlling the compressor to stop running when the compressor meets the minimum running time and meets any of the following conditions: the humidity deviation is less than or equal to a second preset deviation threshold, the ambient temperature is within a second preset temperature range, the humidity deviation is within a first preset humidity range and the target frequency reaches the lower frequency limit and lasts for a first preset duration, the humidity deviation is within a first preset humidity range and the evaporator temperature is higher than the dew point temperature and lasts for a second preset duration, or the compressor's single continuous running time exceeds a third preset duration.

[0006] In an optional embodiment, the ambient temperature frequency reference curve is determined based on the lower frequency limit curve, the upper frequency limit curve, the intelligent reference curve, and the energy-saving reference curve; the above method further includes: refreshing the lower frequency limit curve, the upper frequency limit curve, the intelligent reference curve, and the energy-saving reference curve every fourth preset time interval based on the ambient temperature.

[0007] In an optional embodiment, the above method further includes: within a fifth preset time period after the compressor is turned on, determining the target frequency based on an energy-saving reference curve; after the compressor has been turned on for a period of time of the fifth preset time period, performing the steps of determining the current state of the dehumidifier based on the difference between the ambient humidity and the set humidity, and determining the target frequency of the compressor based on the current state and the ambient temperature frequency reference curve.

[0008] In an optional embodiment, the step of determining the current state of the dehumidifier based on the difference between the ambient humidity and the set humidity includes: if the difference between the ambient humidity and the set humidity is greater than a first preset value, determining that the current state of the dehumidifier is a rapid dehumidification state; if the difference between the ambient humidity and the set humidity is less than or equal to the first preset value, determining that the current state of the dehumidifier is an energy-saving and stable humidity state.

[0009] In an optional embodiment, the energy-saving bias is determined as follows: under rapid dehumidification, the energy-saving bias is determined according to the compressor running time and a preset rule; wherein, the preset rule includes: determining the energy-saving bias based on the intelligent baseline curve and the energy-saving reference curve, and gradually reducing the energy-saving bias in a monotonically decreasing manner following the compressor running time; the fine-tuning bias is determined as follows: in the initial state, the fine-tuning bias is set to a specified value; if the difference between the ambient humidity and the set humidity is greater than a first preset threshold, the current fine-tuning bias is maintained; if the difference between the ambient humidity and the set humidity is less than or equal to the first preset threshold, the current fine-tuning bias is reduced by one step value to obtain the updated fine-tuning bias; wherein, the fine-tuning bias is less than or equal to the energy-saving bias, and the fine-tuning bias is greater than or equal to the difference between the energy-saving reference curve and the frequency lower limit curve.

[0010] In an optional embodiment, after the step of limiting the target frequency within the lower frequency limit curve and the upper frequency limit curve to obtain the final target frequency, the method further includes: after the energy-saving switch is turned on in the intelligent mode and the compressor runs continuously at the upper frequency limit or intelligent reference frequency for a sixth preset time, entering the energy-saving secondary frequency reduction mode, reducing the final target frequency by a preset frequency value to obtain the updated target frequency; and exiting the energy-saving secondary frequency reduction mode in response to a change in the set humidity or a decrease in the ambient humidity relative to the humidity when entering the energy-saving secondary frequency reduction mode exceeding a specified preset threshold.

[0011] In an optional embodiment, the step of determining the target fan speed based on the target frequency and condenser temperature includes: when the compressor is not started or is in the start-up plateau period, the target fan speed is determined as a first wind speed; when the compressor is dehumidifying normally and the actual operating frequency of the compressor does not exceed the target frequency, the base wind speed is obtained according to the target frequency index main wind speed table, and the base wind speed is compensated by superimposing the condenser temperature to obtain the target fan speed; when the compressor is in the frequency reduction process and the actual operating frequency is greater than the target frequency, if the current wind speed is greater than the preset wind speed threshold, the fan speed is reduced step by step according to the preset step value; when the compressor is stopped and in standby mode, the target fan speed is determined as a second wind speed; wherein, the second wind speed is less than the first wind speed.

[0012] In an optional embodiment, the method further includes: when the dehumidifier is in defrosting mode, determining the target fan speed as a third wind speed; wherein the third wind speed is greater than the first wind speed.

[0013] Secondly, embodiments of this disclosure also provide an adaptive adjustment control device for a dehumidifier, the device comprising: a start / stop control module, used to acquire ambient temperature, ambient humidity, set humidity, and condenser temperature, and control the start and stop of the compressor in the dehumidifier according to the ambient temperature, ambient humidity, and set humidity; a state determination module, used to determine the current state of the dehumidifier based on the difference between the ambient humidity and the set humidity when the compressor is in the start state, and to acquire an ambient temperature frequency reference curve; wherein the current state is a rapid dehumidification state or an energy-saving stable humidity state; the ambient temperature frequency reference curve is determined based on a lower frequency limit curve, a higher frequency limit curve, an intelligent reference curve, and an energy-saving reference curve; and a frequency determination module, used for... In response to the current state being rapid dehumidification, the target frequency is determined based on the intelligent reference curve, and the energy-saving bias is gradually reduced according to a preset time period; or, in response to the current state being energy-saving and stable humidity, the target frequency is determined based on the intelligent reference curve, the energy-saving bias, and the fine-tuning bias; wherein, the energy-saving bias is determined based on the intelligent reference curve and the energy-saving reference curve; the fine-tuning bias is determined based on the energy-saving bias, the lower frequency limit curve, and the energy-saving reference curve; the frequency adjustment module is used to limit the target frequency within the lower frequency limit curve and the upper frequency limit curve to obtain the final target frequency; the speed determination module is used to determine the target fan speed based on the final target frequency and the condenser temperature, and control the fan in the dehumidifier to operate at the target fan speed.

[0014] The embodiments disclosed herein bring the following beneficial effects: This disclosure provides an adaptive adjustment and control method and device for a dehumidifier. First, it acquires ambient temperature, ambient humidity, set humidity, and condenser temperature. Based on these parameters, it controls the start and stop of the compressor in the dehumidifier. When the compressor is running, it determines the current state of the dehumidifier based on the difference between the ambient humidity and the set humidity, and acquires an ambient temperature frequency reference curve. The current state includes a rapid dehumidification state and an energy-saving stable humidity state. The ambient temperature frequency reference curve is determined based on a lower frequency limit curve, an upper frequency limit curve, an intelligent reference curve, and an energy-saving reference curve. The method responds to the current state... For rapid dehumidification, a target frequency is determined based on an intelligent reference curve, and the energy-saving bias is gradually reduced according to a preset time period. Alternatively, in response to the current state being energy-saving and stable humidity, a target frequency is determined based on an intelligent reference curve, energy-saving bias, and fine-tuning bias. The energy-saving bias is determined based on the intelligent reference curve and the energy-saving reference curve; the fine-tuning bias is determined based on the energy-saving bias, the lower frequency limit curve, and the energy-saving reference curve. The target frequency is limited within the lower and upper frequency limit curves to obtain the final target frequency. Based on the final target frequency and the condenser temperature, the target fan speed is determined, and the fan in the dehumidifier is controlled to operate at the target fan speed. In this method, the compressor target frequency and fan speed are adaptively adjusted according to the real-time ambient temperature, humidity deviation, and condenser temperature, enabling the unit to dynamically switch between rapid dehumidification and energy-saving stable humidity. This avoids ineffective high-frequency operation, ineffective condensation operation, and fan overspeed operation when approaching the set humidity, thereby significantly reducing overall energy consumption while meeting dehumidification comfort and reliability requirements.

[0015] Other features and advantages of this disclosure will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the disclosure. The objects and other advantages of this disclosure are realized and obtained through the structures particularly pointed out in the description, claims and drawings.

[0016] To make the above-mentioned objects, features and advantages of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating an adaptive adjustment control method for a dehumidifier provided in this embodiment of the present disclosure; Figure 2 A schematic diagram of an ambient temperature frequency reference curve provided for an embodiment of this disclosure; Figure 3 A schematic diagram of an intelligent dual-mode frequency modulation provided in an embodiment of this disclosure; Figure 4 A flowchart illustrating another adaptive adjustment control method for a dehumidifier provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of the structure of an adaptive adjustment control device for a dehumidifier provided in an embodiment of this disclosure. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely to illustrate selected embodiments of the disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0021] Most existing dehumidifiers use a switch-type control system that turns on when humidity exceeds the set level and shuts off when humidity reaches the set level, or simply sets the compressor frequency based on a table looking up the ambient temperature. Fan speeds are often fixed at three levels: high, medium, and low, or are only roughly tied to the actual compressor frequency. Common practices in related technologies include: segmented frequency increases / decreases based on the difference between the set humidity and the ambient humidity; setting a frequency upper limit based on ambient temperature; and implementing safety strategies such as defrosting and frequency limiting for protection.

[0022] However, the existing technology has the following shortcomings: (1) It maintains high frequency operation for a long time during the high humidity stage, and continues to maintain high power after approaching the set humidity, resulting in high energy consumption; (2) When the humidity is close to the set value, there is no judgment on whether it is still effective in condensation and dehumidification, which easily leads to ineffective power consumption due to the evaporation temperature being higher than the dew point and continuing to operate; (3) The fan and compressor lack linkage, and the wind speed does not drop in time when the frequency is reduced, resulting in high noise and fan power consumption; (4) Start-up and shutdown rely only on a single humidity threshold, which easily leads to frequent start-up and shutdown in short cycles and humidity fluctuations.

[0023] To address the aforementioned issues, this disclosure provides an adaptive adjustment and control method and apparatus for a dehumidifier, which can be applied to adaptive adjustment and control scenarios for dehumidifiers.

[0024] To facilitate understanding of this disclosure, a detailed description of an adaptive adjustment and control method for a dehumidifier provided in an embodiment of this disclosure will be given first, such as... Figure 1 As shown, the method includes the following specific steps: Step S102: Obtain ambient temperature, ambient humidity, set humidity and condenser temperature, and control the start and stop of the compressor in the dehumidifier according to the ambient temperature, ambient humidity and set humidity.

[0025] In practical implementation, it is necessary to collect ambient temperature, ambient humidity, set humidity, and condenser temperature in real time. Additionally, it is also necessary to collect evaporator temperature, dew point temperature, actual compressor operating frequency, and actual fan speed in real time. The compressor and fan are components included in the dehumidifier.

[0026] In practice, the dehumidifier compressor is started when the ambient temperature, ambient humidity, and set humidity meet the preset conditions; the dehumidifier compressor is stopped when the ambient temperature, ambient humidity, and set humidity do not meet the preset conditions.

[0027] In one optional embodiment, the humidity deviation can be determined based on the difference between the ambient humidity and the set humidity. If the compressor is in a stopped state, the compressor is controlled to start when the compressor meets the minimum shutdown time and the ambient temperature is within a first preset temperature range and the humidity deviation is greater than or equal to a first preset deviation threshold. If the compressor is in a started state, the compressor is controlled to stop running when the compressor meets the minimum running time and meets any of the following conditions: the humidity deviation is less than or equal to a second preset deviation threshold, the ambient temperature is within a second preset temperature range, the humidity deviation is within a first preset humidity range and the target frequency reaches the lower frequency limit and lasts for a first preset duration, the humidity deviation is within a first preset humidity range and the evaporator temperature is higher than the dew point temperature and lasts for a second preset duration, or the compressor's single continuous running time exceeds a third preset duration.

[0028] In practical implementation, the aforementioned minimum downtime can be 3 minutes, 5 minutes, or 30 minutes, etc. Optionally, if the compressor is undergoing a normal stop, the minimum downtime can be set to 3 minutes; if the compressor's last continuous operation time exceeded 8 hours, the minimum downtime can be set to 30 minutes. The aforementioned first preset temperature range can be 2℃~41℃, or 5℃~41℃, etc. The aforementioned first preset deviation threshold can be 5%RH, 6%RH, etc.

[0029] The minimum running time can be 8 minutes, 10 minutes, or 12 minutes, etc. The second preset deviation threshold can be -5%RH, -6%RH, etc.; the second preset temperature range can be greater than 41℃, less than 2℃, or less than 3℃, etc. The first preset humidity range can be […]. 5%RH, 1%RH]、[ 5%RH, 0%RH] or [ 5%RH, [2%RH] etc. The first preset duration can be 20 minutes, 25 minutes, or 30 minutes, etc. The second preset duration can be 5 minutes, 6 minutes, or 8 minutes, etc.; the third preset duration can be 8 hours, 9 hours, or 10 hours, etc.

[0030] For example, calculate the humidity deviation ΔH = RH_air RH_set; where RH_air represents the ambient humidity and RH_set represents the set humidity. Based on this, in the dehumidifier's smart mode: 1) Compressor start-up conditions: Ambient temperature within the first preset temperature range (approximately 2℃~41℃), and ΔH ≥5%RH; while also meeting the minimum shutdown time.

[0031] 2) Shutdown conditions (must meet the minimum running time of approximately 8 minutes): a. ΔH ≤ 5%RH (significantly lower than the set value); b. Ambient temperature exceeds the limit (>41℃ or <2℃); c. 5%RH<ΔH< 1%RH and the target frequency has reached the lower limit and has been maintained for about 20 minutes (close to the setting but the dehumidification capacity is insufficient). d. 5%RH<ΔH< 1%RH and evaporation temperature > dew point temperature for approximately 5 minutes (condensation dehumidification fails). e. If continuous operation exceeds approximately 8 hours in a single instance, a forced shutdown will occur, triggering extended shutdown protection.

[0032] Step S104: When the compressor is in the start-up state, the current state of the dehumidifier is determined based on the difference between the ambient humidity and the set humidity, and the ambient temperature frequency reference curve is obtained; wherein, the current state is either the rapid dehumidification state or the energy-saving stable humidity state; the ambient temperature frequency reference curve is determined based on the lower frequency limit curve, the upper frequency limit curve, the intelligent reference curve, and the energy-saving reference curve.

[0033] In practice, the current state of the dehumidifier is determined by the difference between the ambient humidity and the set humidity. Different current states result in different differences between the ambient and set humidity levels. Furthermore, the target frequency of the compressor is determined differently for each current state, allowing for efficient compressor operation control based on these varying conditions.

[0034] The aforementioned ambient temperature frequency reference curve is determined based on the lower frequency limit curve, upper frequency limit curve, intelligent reference curve, and energy-saving reference curve. Optionally, the ambient temperature frequency reference curve is obtained by piecewise interpolation of the lower frequency limit curve, upper frequency limit curve, intelligent reference curve, and energy-saving reference curve based on the ambient temperature. Figure 2 The figure shown is a schematic diagram of an ambient temperature frequency reference curve provided in an embodiment of the present invention. Figure 2 It includes the upper frequency limit curve F_max, the lower frequency limit curve F_min, the smart reference curve F_smart, and the energy-saving reference curve F_sleep.

[0035] Step S106: In response to the current state being rapid dehumidification, the target frequency is determined based on the intelligent reference curve, and the energy-saving bias is gradually reduced according to a preset time period; or, in response to the current state being energy-saving stable humidity, the target frequency is determined based on the intelligent reference curve, the energy-saving bias, and the fine-tuning bias; wherein, the energy-saving bias is determined based on the intelligent reference curve and the energy-saving reference curve; the fine-tuning bias is determined based on the energy-saving bias, the frequency lower limit curve, and the energy-saving reference curve.

[0036] In practical implementation, if the current state is rapid dehumidification, the target frequency is determined based on the intelligent reference curve (i.e., the target frequency operates according to the intelligent reference curve). Simultaneously, an energy-saving bias is prepared according to a time sequence and gradually reduced according to a preset time period. Specifically, the energy-saving bias is determined as follows: in rapid dehumidification mode, the energy-saving bias is determined according to preset rules based on the compressor's operating time. These preset rules include: determining the energy-saving bias based on the intelligent reference curve and the energy-saving reference curve, and gradually reducing the energy-saving bias in a monotonically decreasing manner following the compressor's operating time. This method allows for simultaneous dehumidification and reduction of the energy-saving bias in rapid dehumidification mode, ensuring a subsequent energy-saving margin.

[0037] For example, when the compressor runs for 0 to 5 minutes, the target difference between the frequency corresponding to the intelligent reference curve and the frequency corresponding to the energy-saving reference curve is determined as the energy-saving bias; when the compressor runs for 5 to 15 minutes, the product of 3 / 4 and the target difference is determined as the energy-saving bias; when the compressor runs for 15 to 35 minutes, the product of 1 / 2 and the target difference is determined as the energy-saving bias; when the compressor runs for 35 to 60 minutes, the product of 1 / 4 and the target difference is determined as the energy-saving bias; when the compressor runs for more than 60 minutes, 0 is determined as the energy-saving bias.

[0038] If the current state is energy-saving and humidity-stable, it is necessary to calculate the difference between the frequency corresponding to the intelligent reference curve and the energy-saving bias, and then sum this difference and the fine-tuning bias to determine the target frequency. The fine-tuning bias is determined as follows: In the initial state, the fine-tuning bias is set to a specified value; if the difference between the ambient humidity and the set humidity is greater than a first preset threshold, the current fine-tuning bias is maintained; if the difference between the ambient humidity and the set humidity is less than or equal to the first preset threshold, the current fine-tuning bias is reduced by one step value to obtain the updated fine-tuning bias; wherein the fine-tuning bias is less than or equal to the energy-saving bias, and the fine-tuning bias is greater than or equal to the difference between the energy-saving reference curve and the lower frequency limit curve.

[0039] The aforementioned first preset threshold can be 1%RH or 2%RH, etc., the aforementioned specified values ​​are also the initial values ​​for fine-tuning the bias. This initial value can be set to 0 or 1, etc. Specifically, the fine-tuning bias can be updated every preset time interval (the preset time interval can be 2 minutes or 3 minutes, etc.). Moreover, if the difference between the ambient humidity and the set humidity is greater than the first preset threshold, the current fine-tuning bias remains unchanged; if the difference between the ambient humidity and the set humidity is less than or equal to the first preset threshold, the fine-tuning bias is reduced by one step value based on the current fine-tuning bias, and the fine-tuning bias is limited. This step value can be 4 or 6, etc. When limiting, the fine-tuning bias is less than or equal to the energy-saving bias, and the fine-tuning bias is greater than or equal to the difference between the frequency corresponding to the energy-saving reference curve and the frequency corresponding to the lower limit curve.

[0040] Step S108: Limit the target frequency within the lower frequency limit curve and the upper frequency limit curve to obtain the final target frequency.

[0041] After obtaining the target frequency under the current state, it is necessary to display the target frequency between the frequency corresponding to the lower limit curve and the frequency corresponding to the upper limit curve to protect the frequency reduction constraint, and then map the displayed target frequency to the discrete frequency table to output the final target frequency.

[0042] like Figure 3 The diagram shown is a schematic of an intelligent dual-mode frequency modulation provided by an embodiment of the present invention. First, the humidity deviation ΔH = RH_air is calculated. RH_set; where RH_air represents the ambient humidity and RH_set represents the set humidity. Then, based on the humidity deviation, the current state of the dehumidifier is determined. If ΔH > 5%RH, the dehumidifier is determined to be in state A (equivalent to the aforementioned rapid dehumidification state); if ΔH ≤ 5%RH, the dehumidifier is determined to be in state B (equivalent to the aforementioned energy-saving stable humidity state). Simultaneously, when the dehumidifier is in state A, if ΔH ≤ 5%RH, the current state is switched to state B; if the dehumidifier is in state B and ΔH > 8%RH, the initial stage state is switched back to state A to avoid critical point fluctuations.

[0043] In state A: the target frequency operates according to F_smart; simultaneously, energy-saving bias K1 is prepared according to timing. When the compressor runs for 0–5 minutes, K1 = F_smart F_sleep; When the compressor runs for 5–15 minutes, K1 = 3 / 4·(F_smart) F_sleep); When the compressor runs for 15–35 minutes, K1 = 1 / 2·(F_smart) F_sleep); When the compressor runs for 35–60 minutes, K1 = 1 / 4·(F_smart) F_sleep); When the compressor runs for more than 60 minutes, K1 = 0.

[0044] This means that during the high humidity stage, dehumidification is carried out while "attenuation reserve" is made to allow for subsequent energy savings.

[0045] In state B: Target calculation frequency F_cal = F_smart K1 + K2. K2 is the near-set fine-tuning bias, updated approximately every 150 seconds. If ΔH > 1%RH: K2 maintained; If ΔH≤ 1%RH: K2 reduced by 4 (further frequency reduction for energy saving); and K2 limited: K2≤K1, and K2≥ (F_sleep F_min).

[0046] Finally, F_cal is further constrained by F_max / F_min and the protection limit frequency reduction, and then mapped to the discrete frequency table to output the target frequency.

[0047] It should be noted that F_max is the frequency corresponding to the upper limit curve, F_min is the frequency corresponding to the lower limit curve, F_smart is the frequency corresponding to the intelligent reference curve, and F_sleep is the frequency corresponding to the energy-saving reference curve.

[0048] Step S110: Based on the final target frequency and condenser temperature, determine the target fan speed and control the fan in the dehumidifier to run at the target fan speed.

[0049] In practice, the base wind speed is obtained by indexing the main wind speed table according to the final target frequency, and the base wind speed is compensated by superimposing the condenser temperature to obtain the target fan speed; then, the fan in the dehumidifier is controlled to run at the target fan speed.

[0050] In one specific embodiment, when the compressor is not started or is in the start-up plateau period, the target fan speed is determined as the first fan speed; when the compressor is dehumidifying normally and the actual operating frequency of the compressor does not exceed the target frequency, the base fan speed is obtained according to the target frequency index main fan speed table, and the base fan speed is compensated by superimposing the base fan speed according to the condenser temperature to obtain the target fan speed; when the compressor is in the frequency reduction process and the actual operating frequency is greater than the target frequency, if the current fan speed is greater than the preset fan speed threshold, the fan speed is reduced step by step according to the preset step value; when the compressor is stopped and in standby mode, the target fan speed is determined as the second fan speed; wherein, the second fan speed is less than the first fan speed; when the dehumidifier is in defrosting mode, the target fan speed is determined as the third fan speed; wherein, the third fan speed is greater than the first fan speed.

[0051] For example, in intelligent mode, the fan speed is not fixed, but is linked to the compressor's target frequency and condenser temperature to obtain the target fan speed: 1) Compressor not started / startup plateau period: Use medium fan speed (e.g., 750 rpm or 700 rpm) to ensure airflow at the target fan speed; 2) When dehumidifying normally and the actual operating frequency of the compressor does not exceed the target frequency: use the target frequency to index the main fan speed table (approximately 700-1050 rpm as the frequency increases), and after the compressor has run for approximately the preset time, use the condenser temperature superimposed compensation table (0 / 50 / 100 rpm) to appropriately increase the speed to enhance heat exchange during high-temperature condensation.

[0052] 3) When the compressor is in the process of frequency reduction and the actual operating frequency is greater than the target frequency: if the current wind speed is greater than the preset wind speed threshold (for example, the preset wind speed threshold can be 900rpm or 950rpm, etc.), then reduce the speed by 50rpm after 10s and then by 50rpm after 30s to avoid maintaining high wind noise and high fan power consumption after frequency reduction. 4) Compressor shutdown and standby: Set the target fan speed as the second wind speed, which is a gentle breeze (350 rpm in the example) to maintain air circulation and humidity sampling; 5) When the dehumidifier is in defrosting mode, the target fan speed is set to the third fan speed, which is a relatively high fan speed (example 1050 rpm) to speed up defrosting.

[0053] This disclosure provides an adaptive adjustment and control method for a dehumidifier. Based on real-time ambient temperature, humidity deviation, and condenser temperature, the method adaptively adjusts the compressor target frequency and fan speed, enabling the unit to dynamically switch between rapid dehumidification and energy-saving humidity stabilization. This avoids ineffective high-frequency operation, ineffective condensation operation, and excessive fan speed operation when the humidity is close to the set value, thereby significantly reducing overall energy consumption while meeting dehumidification comfort and reliability requirements.

[0054] The following examples illustrate how to determine a target frequency.

[0055] Furthermore, based on the ambient temperature, the frequency lower limit curve, frequency upper limit curve, intelligent reference curve, and energy-saving reference curve are refreshed every fourth preset interval. This fourth preset interval can be 5 minutes, 6 minutes, or 8 minutes, etc.

[0056] Based on the above description, in order to improve the smoothness of compressor startup, within the fifth preset time after the compressor starts, the target frequency is determined based on the energy-saving reference curve; after the compressor starts for the fifth preset time, the following steps are performed: determining the current state of the dehumidifier based on the difference between the ambient humidity and the set humidity, and determining the target frequency of the compressor based on the current state and the ambient temperature frequency reference curve.

[0057] The aforementioned fifth preset duration can be 40 seconds, 30 seconds, or 20 seconds, etc. Specifically, during the fifth preset duration at the initial stage of compressor startup, the compressor is started at the frequency corresponding to the energy-saving reference curve as the target frequency, which can improve the start-up stability of the compressor.

[0058] Furthermore, the current state mentioned above includes rapid dehumidification state and energy-saving stable humidity state. Based on this, if the difference between the ambient humidity and the set humidity is greater than a first preset value, the current state is determined to be rapid dehumidification state; if the difference between the ambient humidity and the set humidity is less than or equal to the first preset value, the current state is determined to be energy-saving stable humidity state. The first preset value can be 5%RH, 6%RH, etc.

[0059] Optionally, when the current state is rapid dehumidification, if the difference between the ambient humidity and the set humidity is less than or equal to a first preset value, the current state is adjusted from rapid dehumidification to energy-saving stable humidity state; when the current state is energy-saving stable humidity state, if the difference between the ambient humidity and the set humidity is greater than a second preset value, the current state is adjusted from energy-saving stable humidity state to rapid dehumidification state, thereby avoiding critical point fluctuations. The second preset value is greater than the first preset value.

[0060] The aforementioned humidity deviation dual-state machine and hysteresis switching method decouple rapid dehumidification from energy-saving humidity stabilization, avoiding energy consumption and humidity fluctuations caused by single threshold switching.

[0061] exist Figure 3 In the intelligent mode shown, in state A (rapid dehumidification state, state_auto_run=FALSE), timer T1 decays sequentially to prepare energy-saving bias K1, and outputs F_cal=F_smart; in state B (energy-saving stable humidity state, state_auto_run=TRUE), K1 is maintained at the time of entry, and the bias is adjusted relative to ΔH at a period of approximately 150s. 1%RH update condition fine-tuning bias K2 (ΔH≤ (K2 is reduced by 4 and limited at 1%RH), output F_cal = F_smart K1+K2. The two states are switched with a hysteresis of 5% / 8%RH; T1, T2, K1, and K2 are all reset when the machine stops or exits intelligent mode.

[0062] The following examples illustrate the secondary down-frequency mode.

[0063] After limiting the target frequency to within the lower and upper frequency limits curves to obtain the final target frequency, the energy-saving switch is turned on in intelligent mode and the compressor runs continuously at the upper frequency limit or intelligent reference frequency for a sixth preset time. Then, the energy-saving secondary frequency reduction mode is entered to reduce the final target frequency by a preset frequency value to obtain the updated target frequency. In response to changes in the set humidity or a decrease in ambient humidity relative to the humidity when entering the energy-saving secondary frequency reduction mode exceeding a specified preset threshold, the energy-saving secondary frequency reduction mode is exited.

[0064] The sixth preset duration mentioned above can be 90 minutes or 100 minutes, etc. The specified preset threshold mentioned above can be 5%RH or 3%RH, etc.

[0065] For example, after the energy-saving switch is activated in smart mode, if the compressor runs continuously at F_max or F_smart for approximately 90 minutes, it enters the energy-saving secondary frequency reduction mode: the final target frequency is reduced by approximately 6Hz from the current setting (not lower than F_min). If the user changes the humidity setting, or the ambient humidity decreases by more than approximately 5%RH compared to when the secondary frequency reduction mode was entered, the secondary frequency reduction mode will exit. This method automatically reduces the frequency again after prolonged high-load operation and exits when the ambient humidity drops significantly or the setting is changed, forming a long-term energy-saving closed loop.

[0066] like Figure 4The diagram shows a flowchart of another adaptive adjustment and control method for a dehumidifier provided in an embodiment of the present invention. First, the ambient temperature T_air, average ambient humidity RH_air, set humidity RH_set, evaporation temperature T_eva, dew point temperature T_dew, condenser temperature T_cod, actual compressor frequency F_run, and actual fan speed are collected. Then, the humidity deviation ΔH = RH_air is calculated. The system initializes RH_set and determines the compressor's start-up based on start-up and shutdown conditions. Then, it refreshes F_max, F_min, F_smart, and F_sleep every 5 minutes using T_air. For the first 40 seconds after compressor start-up, the target frequency F_cal is set to F_sleep; thereafter, it enters a dual-state adaptive frequency adjustment to obtain the target frequency F_cal. F_cal is limited to [F_min, F_max], and after overlaying the protection limit for frequency reduction, it is mapped to the frequency table to obtain the final target frequency F_tar; if ECO (equivalent to a secondary energy-saving frequency reduction mode) is active, F_tar is further reduced by approximately 6Hz. Then, F_tar is used to index the main fan speed table W1, and T_cod is used to retrieve the compensation table W2 to obtain the fan's target speed; the frequency reduction process executes graded speed reduction; when shutting down, a low-speed setting is applied. The actual operating frequency of the compressor is brought closer to F_tar according to the frequency increase / decrease rate, and the fan speed is brought closer to the target fan speed. The above parameters are collected again, and the above steps are repeated cyclically.

[0067] In the above method, when ineffective dehumidification is detected and the system shuts down, a dual criterion of "maintaining the lower limit frequency for a long time" and "T_eva > T_dew" is introduced when the humidity is close to the set range to shut down the system in a timely manner and avoid ineffective condensation power consumption. The above method also determines the fan speed based primarily on the target frequency and secondarily on the condensation temperature, and reduces the fan speed in stages when the frequency is reduced, taking into account heat exchange efficiency, noise, and fan power consumption.

[0068] Corresponding to the above method embodiments, this disclosure also provides an adaptive adjustment control device for a dehumidifier, such as... Figure 5 As shown, the device includes: The start / stop control module 50 is used to acquire ambient temperature, ambient humidity, set humidity and condenser temperature, and control the start and stop of the compressor in the dehumidifier according to the ambient temperature, ambient humidity and set humidity.

[0069] The state determination module 51 is used to determine the current state of the dehumidifier based on the difference between the ambient humidity and the set humidity when the compressor is in the start-up state, and to obtain the ambient temperature frequency reference curve; wherein the current state is either rapid dehumidification state or energy-saving stable humidity state; the ambient temperature frequency reference curve is determined based on the lower frequency limit curve, the upper frequency limit curve, the intelligent reference curve and the energy-saving reference curve.

[0070] The frequency determination module 52 is used to determine the target frequency based on the intelligent reference curve in response to the current state being rapid dehumidification, and to gradually reduce the energy-saving bias according to a preset time period; or, in response to the current state being energy-saving and stable humidity, to determine the target frequency based on the intelligent reference curve, the energy-saving bias, and the fine-tuning bias; wherein, the energy-saving bias is determined based on the intelligent reference curve and the energy-saving reference curve; and the fine-tuning bias is determined based on the energy-saving bias, the frequency lower limit curve, and the energy-saving reference curve.

[0071] The frequency adjustment module 53 is used to limit the target frequency within the lower frequency limit curve and the upper frequency limit curve to obtain the final target frequency.

[0072] The speed determination module 54 is used to determine the target speed of the fan based on the final target frequency and the condenser temperature, and to control the fan in the dehumidifier to run at the target speed.

[0073] The adaptive adjustment and control device of the above-mentioned dehumidifier adaptively adjusts the target frequency of the compressor and the speed of the fan according to the real-time ambient temperature, humidity deviation and condenser temperature, so that the unit can dynamically switch between rapid dehumidification and energy-saving humidity stabilization, avoiding ineffective high-frequency operation, ineffective condensation operation and fan overspeed operation when the humidity is close to the set humidity, thereby significantly reducing the overall energy consumption while meeting the dehumidification comfort and reliability requirements.

[0074] Furthermore, the aforementioned start / stop control module 50 is used to: determine the humidity deviation based on the difference between the ambient humidity and the set humidity; if the compressor is in a stopped state, control the compressor to start when the compressor meets the minimum shutdown time and the ambient temperature is within the first preset temperature range and the humidity deviation is greater than or equal to the first preset deviation threshold; if the compressor is in a started state, control the compressor to stop running when the compressor meets the minimum running time and meets any of the following conditions: the humidity deviation is less than or equal to the second preset deviation threshold, the ambient temperature is within the second preset temperature range, the humidity deviation is within the first preset humidity range and the target frequency reaches the lower frequency limit and lasts for a first preset duration, the humidity deviation is within the first preset humidity range and the evaporator temperature is higher than the dew point temperature and lasts for a second preset duration, or the compressor's single continuous running time exceeds a third preset duration.

[0075] Furthermore, the aforementioned device also includes a curve update module, used to refresh the frequency lower limit curve, frequency upper limit curve, intelligent reference curve, and energy-saving reference curve every fourth preset time interval according to the ambient temperature.

[0076] Furthermore, the above-mentioned device also includes a pre-start module, used to: determine the target frequency based on the energy-saving reference curve within a fifth preset time after the compressor is turned on; and after the compressor has been turned on for a period of time of the fifth preset time, perform the following steps: determine the current state of the dehumidifier based on the difference between the ambient humidity and the set humidity, and determine the target frequency of the compressor based on the current state and the ambient temperature frequency reference curve.

[0077] Furthermore, the frequency determination module 52 is used to: determine that the current state of the dehumidifier is rapid dehumidification state when the difference between the ambient humidity and the set humidity is greater than the first preset value; and determine that the current state of the dehumidifier is energy-saving and humidity-stabilizing state when the difference between the ambient humidity and the set humidity is less than or equal to the first preset value.

[0078] Furthermore, the energy-saving bias is determined as follows: under rapid dehumidification, the energy-saving bias is determined according to the compressor running time and preset rules; wherein, the preset rules include: determining the energy-saving bias based on the intelligent baseline curve and the energy-saving reference curve, and gradually reducing the energy-saving bias in a monotonically decreasing manner following the compressor running time; the fine-tuning bias is determined as follows: in the initial state, the fine-tuning bias is set to a specified value; if the difference between the ambient humidity and the set humidity is greater than the first preset threshold, the current fine-tuning bias is maintained; if the difference between the ambient humidity and the set humidity is less than or equal to the first preset threshold, the current fine-tuning bias is reduced by one step value to obtain the updated fine-tuning bias; wherein, the fine-tuning bias is less than or equal to the energy-saving bias, and the fine-tuning bias is greater than or equal to the difference between the energy-saving reference curve and the frequency lower limit curve.

[0079] Furthermore, the aforementioned device also includes a frequency reduction module, used to: after limiting the target frequency within the lower frequency limit curve and the upper frequency limit curve to obtain the final target frequency, after the energy-saving switch is turned on in intelligent mode and the compressor continues to run at the upper frequency limit or intelligent reference frequency for a sixth preset time, enter the energy-saving secondary frequency reduction mode to reduce the final target frequency by a preset frequency value to obtain the updated target frequency; and exit the energy-saving secondary frequency reduction mode in response to the setting humidity being changed or the ambient humidity decreasing relative to the humidity when entering the energy-saving secondary frequency reduction mode exceeding a specified preset threshold.

[0080] Furthermore, the aforementioned speed determination module 43 is used for: determining the target fan speed as the first wind speed when the compressor is not started or is in the start-up plateau period; obtaining the base wind speed by indexing the main wind speed table according to the target frequency when the compressor is dehumidifying normally and the actual operating frequency of the compressor does not exceed the target frequency, and compensating for the base wind speed by superimposing it according to the condenser temperature to obtain the target fan speed; reducing the fan speed step by step according to the preset step value when the compressor is in the frequency reduction process and the actual operating frequency is greater than the target frequency; determining the target fan speed as the second wind speed when the compressor is stopped and in standby mode; wherein the second wind speed is less than the first wind speed; and determining the target fan speed as the third wind speed when the dehumidifier is in defrosting mode; wherein the third wind speed is greater than the first wind speed.

[0081] The adaptive adjustment control device for dehumidifiers provided in this embodiment has the same implementation principle and technical effect as the aforementioned method embodiment. For the sake of brevity, any parts not mentioned in the device embodiment can be referred to the corresponding content in the aforementioned method embodiment.

[0082] The aforementioned function, when implemented as a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to the prior art, or a portion 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, a terminal device, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this disclosure. 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.

[0083] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0084] Finally, it should be noted that the above-described embodiments are merely specific implementations of this disclosure, used to illustrate the technical solutions of this disclosure, and not to limit it. The protection scope of this disclosure is not limited thereto. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this disclosure. Such modifications, changes, 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 this disclosure, and should all be covered within the protection scope of this disclosure. Therefore, the protection scope of this disclosure should be determined by the protection scope of the claims.

Claims

1. An adaptive adjustment and control method for a dehumidifier, characterized in that, The method includes: The system acquires ambient temperature, ambient humidity, set humidity, and condenser temperature, and controls the start and stop of the compressor in the dehumidifier based on the ambient temperature, ambient humidity, and set humidity. When the compressor is in the start-up state, the current state of the dehumidifier is determined based on the difference between the ambient humidity and the set humidity, and an ambient temperature frequency reference curve is obtained; wherein, the current state is either a rapid dehumidification state or an energy-saving stable humidity state; the ambient temperature frequency reference curve is determined based on the lower frequency limit curve, the upper frequency limit curve, the intelligent reference curve, and the energy-saving reference curve. In response to the current state being the rapid dehumidification state, a target frequency is determined based on the intelligent reference curve, and the energy-saving bias is gradually reduced according to a preset time period; or, in response to the current state being the energy-saving stable humidity state, a target frequency is determined based on the intelligent reference curve, the energy-saving bias, and the fine-tuning bias; wherein, the energy-saving bias is determined based on the intelligent reference curve and the energy-saving reference curve; the fine-tuning bias is determined based on the energy-saving bias, the frequency lower limit curve, and the energy-saving reference curve; By limiting the target frequency within the lower frequency limit curve and the upper frequency limit curve, the final target frequency is obtained. Based on the final target frequency and the condenser temperature, the target fan speed is determined, and the fan in the dehumidifier is controlled to operate at the target fan speed.

2. The method according to claim 1, characterized in that, The step of controlling the start and stop of the compressor in the dehumidifier based on the ambient temperature, the ambient humidity, and the set humidity includes: The humidity deviation is determined based on the difference between the ambient humidity and the set humidity. If the compressor is in a stopped state, when the compressor meets the shortest shutdown time, and the ambient temperature is within a first preset temperature range and the humidity deviation is greater than or equal to a first preset deviation threshold, the compressor is controlled to start. If the compressor is in the start state, the compressor is controlled to stop running when the compressor meets the minimum running time and meets any of the following conditions: the humidity deviation is less than or equal to the second preset deviation threshold, the ambient temperature is within the second preset temperature range, the humidity deviation is within the first preset humidity range and the target frequency reaches the lower frequency limit and continues for a first preset duration, the humidity deviation is within the first preset humidity range and the evaporator temperature is higher than the dew point temperature and continues for a second preset duration, or the compressor's single continuous running time exceeds a third preset duration.

3. The method according to claim 1, characterized in that, The method further includes: Based on the ambient temperature, the lower frequency limit curve, the upper frequency limit curve, the intelligent reference curve, and the energy-saving reference curve are refreshed every fourth preset time interval.

4. The method according to claim 1, characterized in that, The method further includes: Within a fifth preset time period after the compressor is turned on, the target frequency is determined based on the energy-saving reference curve; After the compressor has been running for the fifth preset duration, the following steps are performed: determining the current state of the dehumidifier based on the difference between the ambient humidity and the set humidity, and determining the target frequency of the compressor based on the current state and the ambient temperature frequency reference curve.

5. The method according to claim 4, characterized in that, The step of determining the current state of the dehumidifier based on the difference between the ambient humidity and the set humidity includes: If the difference between the ambient humidity and the set humidity is greater than the first preset value, the current state of the dehumidifier is determined to be the rapid dehumidification state. If the difference between the ambient humidity and the set humidity is less than or equal to the first preset value, the current state of the dehumidifier is determined to be the energy-saving and stable humidity state.

6. The method according to claim 1, characterized in that, The energy-saving bias is determined as follows: under the rapid dehumidification state, the energy-saving bias is determined according to the compressor running time and a preset rule; wherein, the preset rule includes: determining the energy-saving bias based on the intelligent baseline curve and the energy-saving reference curve, and gradually reducing the energy-saving bias in a monotonically decreasing manner following the compressor running time; The fine-tuning bias is determined as follows: In the initial state, the fine-tuning bias is set to a specified value; if the difference between the ambient humidity and the set humidity is greater than a first preset threshold, the current fine-tuning bias is maintained; if the difference between the ambient humidity and the set humidity is less than or equal to the first preset threshold, the current fine-tuning bias is reduced by one step value to obtain the updated fine-tuning bias; wherein, the fine-tuning bias is less than or equal to the energy-saving bias, and the fine-tuning bias is greater than or equal to the difference between the energy-saving reference curve and the lower frequency limit curve.

7. The method according to claim 1, characterized in that, After the step of limiting the target frequency within the lower frequency limit curve and the upper frequency limit curve to obtain the final target frequency, the method further includes: After the energy-saving switch is turned on in intelligent mode and the compressor has been running continuously at the upper frequency limit or intelligent reference frequency for a sixth preset time, it enters the energy-saving secondary frequency reduction mode, which reduces the final target frequency by a preset frequency value to obtain the updated target frequency. When the set humidity is changed or the ambient humidity decreases more than a specified preset threshold relative to the humidity when entering the energy-saving secondary frequency reduction mode, the energy-saving secondary frequency reduction mode is exited.

8. The method according to claim 1, characterized in that, The step of determining the target fan speed based on the target frequency and the condenser temperature includes: When the compressor is not started or is in the start-up plateau period, the target speed of the fan is determined as the first wind speed; When the compressor is dehumidifying normally and the actual operating frequency of the compressor does not exceed the target frequency, the basic wind speed is obtained by indexing the main wind speed table according to the target frequency, and the basic wind speed is compensated by superimposing the condenser temperature to obtain the target fan speed; When the compressor is in the frequency reduction process and the actual operating frequency is greater than the target frequency, if the current wind speed is greater than the preset wind speed threshold, the fan speed is reduced step by step according to the preset step value. When the compressor is stopped and in standby mode, the target speed of the fan is determined as the second wind speed; wherein the second wind speed is less than the first wind speed.

9. The method according to claim 8, characterized in that, The method further includes: When the dehumidifier is in defrosting mode, the target fan speed is determined to be the third wind speed; wherein the third wind speed is greater than the first wind speed.

10. An adaptive adjustment control device for a dehumidifier, characterized in that, The device includes: The start / stop control module is used to acquire ambient temperature, ambient humidity, set humidity and condenser temperature, and control the start and stop of the compressor in the dehumidifier according to the ambient temperature, ambient humidity and set humidity; The status determination module is used to determine the current status of the dehumidifier based on the difference between the ambient humidity and the set humidity when the compressor is in the start-up state, and to obtain the ambient temperature frequency reference curve; wherein, the current status is either a rapid dehumidification state or an energy-saving stable humidity state; the ambient temperature frequency reference curve is determined based on the lower frequency limit curve, the upper frequency limit curve, the intelligent reference curve, and the energy-saving reference curve; A frequency determination module is used to determine a target frequency based on the intelligent reference curve in response to the current state being the rapid dehumidification state, and to gradually reduce the energy-saving bias according to a preset time period; or, in response to the current state being the energy-saving stable humidity state, to determine a target frequency based on the intelligent reference curve, the energy-saving bias, and a fine-tuning bias; wherein the energy-saving bias is determined based on the intelligent reference curve and the energy-saving reference curve; and the fine-tuning bias is determined based on the energy-saving bias, the frequency lower limit curve, and the energy-saving reference curve. A frequency adjustment module is used to limit the target frequency within the lower frequency limit curve and the upper frequency limit curve to obtain the final target frequency. The speed determination module is used to determine the target speed of the fan based on the final target frequency and the condenser temperature, and control the fan in the dehumidifier to run at the target speed.

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