Drying control method for a laundry treatment device

Abstract

The present invention relates to the technical field of clothing treatment, and particularly relates to a drying control method for a clothing treatment device. This application aims to solve the problem that a clothes dryer using a constant-speed compressor cannot automatically adjust the drying speed. For this purpose, the clothing treatment device of this application includes a variable-displacement variable-frequency compressor, and the variable-displacement variable-frequency compressor includes a cylinder block and a piston arranged in the cylinder block, and the moving stroke of the piston is adjustable. The control method includes: determining the optimal exhaust volume of the compressor according to the information of the clothes to be dried; obtaining the initial stroke of the piston; controlling the piston of the compressor to operate according to the initial stroke and adjusting the frequency of the compressor so that the actual exhaust volume of the compressor is equal to the optimal exhaust volume or the difference from the optimal exhaust volume is within a preset difference range; obtaining the current frequency of the compressor and judging whether the current frequency is within a preset frequency range; and selectively adjusting the moving stroke of the piston according to the judgment result. This application can automatically adjust the drying speed, has high drying efficiency, and is energy-saving.

Description

Technical Field

[0001] The present invention relates to the technical field of clothing treatment, and particularly relates to a drying control method for a clothing treatment device. Background Art

[0002] With the improvement of living standards, more and more families purchase clothes dryers, which are convenient and easy to use. For clothes dryers, heat pump dryers have become the mainstream products in the market due to their high working efficiency and other characteristics.

[0003] However, the compressors used in current heat pump dryers on the market are all fixed-speed compressors with fixed frequency and displacement, and cannot automatically adjust the drying speed according to user needs. In this way, when there are more clothes to be dried or they are urgently needed to be worn, the drying time is long and a great deal of time is wasted. When drying a single piece of clothing or small items, there is also the defect of high power consumption, resulting in user complaints.

[0004] Correspondingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] In order to solve at least one of the above problems in the prior art, that is, to solve the problem that the existing clothes dryer using a fixed-speed compressor cannot automatically adjust the drying speed, the present application provides a drying control method for a clothing treatment device. The clothing treatment device includes a box body, a drying air duct, a variable displacement variable frequency compressor, a condenser, a throttling device and an evaporator. The box body has an air inlet and an air outlet, and the air inlet and the air outlet are respectively communicated with the drying air duct. The variable displacement variable frequency compressor, the condenser, the throttling device and the evaporator are sequentially connected through a refrigerant pipeline. The condenser and the evaporator are arranged in the drying air duct. The variable displacement variable frequency compressor includes a cylinder block and a piston slidably arranged in the cylinder block, and the moving stroke of the piston in the cylinder block is adjustable.

[0006] The control method includes:

[0007] Determine the optimal displacement of the compressor according to the information of the clothes to be dried;

[0008] Obtain the initial stroke of the piston;

[0009] Control the piston of the compressor to operate according to the initial stroke and adjust the frequency of the compressor so that the actual displacement of the compressor is equal to the optimal displacement, or the difference between the actual displacement and the optimal displacement is within a preset difference range;

[0010] Obtain the current frequency of the compressor and determine whether the current frequency is within a preset frequency range;

[0011] According to the judgment result, selectively adjust the moving stroke of the piston.

[0012] In the preferred technical solution of the drying control method of the above-mentioned laundry treatment device, the step of "selectively adjusting the moving stroke of the piston according to the judgment result" further includes:

[0013] If the current frequency is within the preset frequency range, control the compressor to continue running at the current frequency;

[0014] If the current frequency is not within the preset frequency range, adjust the moving stroke of the piston.

[0015] In the preferred technical solution of the drying control method of the above-mentioned laundry treatment device, the step of "if the current frequency is not within the preset frequency range, adjust the moving stroke of the piston" further includes:

[0016] If the current frequency is less than the minimum value of the preset frequency range, reduce the moving stroke of the piston;

[0017] If the current frequency is greater than the maximum value of the preset frequency range, increase the moving stroke of the piston.

[0018] In the preferred technical solution of the drying control method of the above-mentioned laundry treatment device, the preset frequency range is determined based on the best efficiency frequency of the compressor.

[0019] In the preferred technical solution of the drying control method of the above-mentioned laundry treatment device, the step of reducing the moving stroke of the piston further includes:

[0020] Calculate the stroke to which the piston needs to be reduced through the following formula:

[0021] La = L0 × [(fn - 2) / fn]

[0022] Where, La is the stroke to which the piston needs to be reduced; L0 is the initial stroke; fn is the best efficiency frequency; (fn - 2) is the minimum value of the preset frequency range.

[0023] In the preferred technical solution of the drying control method of the above-mentioned laundry treatment device, the step of increasing the moving stroke of the piston further includes:

[0024] Calculate the stroke to which the piston needs to be increased through the following formula:

[0025] Lb = L0 × [(fn + 2) / fn]

[0026] Wherein, Lb is the stroke to which the piston needs to be increased; L0 is the initial stroke; fn is the optimal efficiency frequency; (fn + 2) is the maximum value of the preset frequency range.

[0027] In the preferred technical solution of the drying control method of the above-mentioned laundry treatment device, the control method further includes:

[0028] Obtain the drying gear;

[0029] Determine the initial stroke of the piston according to the drying gear.

[0030] In the preferred technical solution of the drying control method of the above-mentioned laundry treatment device, the step of "determining the optimal exhaust volume of the compressor according to the information of the laundry to be dried" further includes:

[0031] Obtain the weight and volume of the laundry to be dried;

[0032] Determine the optimal exhaust volume of the compressor according to the weight and volume of the laundry to be dried.

[0033] In the preferred technical solution of the drying control method of the above-mentioned laundry treatment device, the actual exhaust volume is calculated and determined by the following formula:

[0034] Q = f × L × π × (d / 2) 2

[0035] Wherein, Q is the actual exhaust volume; f is the frequency of the compressor; L is the moving stroke of the piston; d is the diameter of the cylinder block.

[0036] In the preferred technical solution of the drying control method of the above-mentioned laundry treatment device, the piston is connected to an adjustable elastic spring, and the step of "adjusting the moving stroke of the piston" further includes:

[0037] Adjust the moving stroke of the piston by adjusting the elastic force of the adjustable elastic spring.

[0038] By providing a variable displacement and variable frequency compressor, the laundry treatment device of the present application can automatically adjust the drying speed by adjusting the exhaust volume and operating frequency of the compressor, and make the compressor frequency operate as close as possible to the highest point or near the highest point of efficiency, with high drying efficiency and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drying control method of the laundry treatment device of the present application will be described below with reference to the accompanying drawings. In the drawings:

[0040] Figure 1 is a system schematic diagram of the laundry treatment device of the present application;

[0041] Figure 2 It is a flowchart of the drying control method for the laundry treatment device of the present application;

[0042] Figure 3 It is a frequency - working efficiency curve graph of the compressor of the present application.

[0043] List of Reference Signs

[0044] 1. Variable - volume variable - frequency compressor; 11. Cylinder block; 12. Piston; 13. Elastic spring; 2. Condenser; 3. Throttling device; 4. Evaporator; 5. Box body. Specific embodiments

[0045] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present application and are not intended to limit the protection scope of the present application. For example, although the following steps are described in the above - mentioned sequential order in the following embodiments, those skilled in the art can understand that in order to achieve the effects of this embodiment, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in a reversed order, and these simple changes are all within the protection scope of the present application.

[0046] First, refer to Figure 1 and Figure 2 , to describe the drying control method for the laundry treatment device of the present application. Among them, Figure 1 It is a system schematic diagram of the laundry treatment device of the present application; Figure 2 It is a flowchart of the drying control method for the laundry treatment device of the present application.

[0047] In order to solve the problem that the existing clothes dryer using a constant - speed compressor 1 cannot automatically adjust the drying speed, the present application provides a drying control method for a laundry treatment device. Among them, as Figure 1As shown in the figure, the laundry treatment device includes a cabinet 5, a drying air duct, a variable displacement and variable frequency compressor 1, a condenser 2, a throttling device 3, and an evaporator 4. The cabinet 5 has an air inlet and an air outlet, which are respectively communicated with the drying air duct. The variable displacement and variable frequency compressor 1, the condenser 2, the throttling device 3, and the evaporator 4 are sequentially connected through a refrigerant pipeline. The condenser 2 and the evaporator 4 are arranged in the drying air duct. The variable displacement and variable frequency compressor 1 includes a cylinder block 11 and a piston 12 slidably arranged in the cylinder block 11, and the moving stroke of the piston 12 in the cylinder block 11 is adjustable. Specifically, the drying air duct, the compressor 1, the condenser 2, the throttling device 3, and the evaporator 4 form a conventional drying circuit. The connection relationship and drying principle between the components are conventional means in the art and will not be elaborated here. In particular, the compressor 1 in this application uses a variable displacement and variable frequency compressor 1, which has a cylinder block 11 and a piston 12. The piston 12 achieves the purpose of compression by reciprocating movement in the cylinder block 11. Among them, the moving stroke of the piston 12 is adjustable. In other words, the maximum displacement of the piston 12 sliding in the cylinder block 11 is adjustable, that is Figure 1 L is variable in

[0048] Further, in this application, one end of the piston 12 away from the cylinder block 11 is connected with an elastic spring 13, and the moving stroke of the piston 12 is adjusted by the elastic spring 13. This application does not limit the specific form of the elastic spring 13, as long as its elastic force can be automatically adjusted, it can be applied to this application. For example, the elastic spring 13 can be an electromagnetic spring, an air spring, a pneumatic spring, and a mechanically adjustable elastic spring 13, etc. By adjusting the elastic force of the elastic spring 13, the moving stroke L of the piston 12 in the cylinder block 11 is adjusted.

[0049] Of course, in addition to the adjustable stroke of the piston 12 described above, those skilled in the art can also select other variable displacement and variable frequency compressors 1 for replacement, so that this application is suitable for more specific application scenarios. For example, those skilled in the art can also select a variable displacement and variable frequency compressor with an adjustable volume of the cylinder block 11, or use other types of compressors 1 with an adjustable moving stroke, such as by controlling the extending / retracting length / forward and reverse rotation angle of the motor shaft, etc., to control the moving stroke of the piston 12.

[0050] Referring to Figure 2 , in the above setting mode, the drying control method of the laundry treatment device of this application includes:

[0051] S101. Determine the optimal displacement of the compressor according to the information of the clothes to be dried. For example, the information of the clothes to be dried may include one or more of the number, volume, and weight of the clothes. The number of clothes can be obtained based on user input or determined based on image recognition; the volume of the clothes can be determined based on image recognition or estimated according to the type of clothes input by the user; the weight of the clothes can be obtained based on a weight sensor or determined based on parameters such as the current when the cabinet rotates. After determining the information of the clothes to be dried, determine the optimal displacement of the compressor based on the information of the clothes to be dried. Among them, the determination method can be a fitting formula, an empirical formula, a comparison relation table, etc., and the present application does not limit this.

[0052] S103. Obtain the initial stroke of the piston; for example, the initial stroke of the piston can be input by the user, can be preset, or can also be determined according to a comparison relation table between the initial formation and other parameters such as the information of the clothes to be dried and the drying gear.

[0053] S105. Control the piston of the compressor to operate according to the initial stroke and adjust the frequency of the compressor so that the actual displacement of the compressor is equal to the optimal displacement, or the difference between the actual displacement and the optimal displacement is within a preset difference range. For example, in the present application, the actual displacement during the operation of the compressor is positively correlated with the initial stroke of the piston and the frequency of the compressor. After determining the optimal displacement and the initial stroke, adjust the elastic force of the elastic spring so that the piston of the compressor is controlled to operate according to the initial stroke, then adjust the frequency of the compressor, and obtain the actual displacement of the compressor until the actual displacement of the compressor is equal to the optimal displacement or the difference from the optimal displacement is within the preset difference range. Among them, the preset difference range is preset in advance.

[0054] S107. Obtain the current frequency of the compressor and determine whether the current frequency is within a preset frequency range. For example, when the actual displacement of the compressor reaches the optimal displacement or the difference from the optimal displacement is within the preset difference range, obtain the current frequency of the compressor at this time and determine whether the current frequency is within the preset frequency range, such as comparing the current frequency with the maximum and minimum values in the preset frequency range by calculating the difference or ratio. Among them, the preset frequency range is determined based on the optimal efficiency frequency of the compressor. For example, the preset frequency range is a certain amount of floating up and down from the optimal efficiency frequency. Refer to Figure 3 , the optimal efficiency frequency is the frequency when the working efficiency of the compressor is the highest, and this frequency can be the rated frequency or other frequencies.

[0055] S109. Selectively adjust the moving stroke of the piston according to the judgment result. For example, when the current frequency is within the preset frequency range, do not adjust the moving stroke of the piston; when the current frequency is not within the preset frequency range, adjust the moving stroke of the piston, so as to indirectly adjust the operating frequency of the compressor by adjusting the moving stroke of the piston, so that the operating frequency of the compressor can approach or reach the optimal efficiency frequency.

[0056] By setting a variable displacement and variable frequency compressor, the laundry treatment device of the present application can automatically adjust the drying speed by adjusting the exhaust volume and operating frequency of the compressor, and make the compressor frequency operate as close as possible to or near the highest point of efficiency, with high drying efficiency and energy saving.

[0057] Next, taking the laundry treatment device as a dryer as an example, the preferred embodiments of the present application will be introduced.

[0058] In a preferred embodiment, the step of "selectively adjusting the moving stroke of the piston according to the judgment result" further includes: if the current frequency is within the preset frequency range, control the compressor to continue operating at the current frequency; if the current frequency is not within the preset frequency range, adjust the moving stroke of the piston.

[0059] For example, the preset efficiency range can be (fn - 2, fn + 2), where fn is the optimal efficiency frequency. If the current frequency is within the preset frequency range, it proves that the operating frequency of the compressor is the optimal efficiency frequency or near the optimal efficiency frequency at this time, the operating efficiency of the compressor is the highest, the drying efficiency is high, and the power consumption is small. At this time, there is no need to adjust the moving stroke of the piston, and it is only necessary to control the compressor to continue operating at the current frequency. On the contrary, if the current frequency is not within the preset frequency range, it proves that there is still a certain gap between the operating frequency of the compressor and the optimal efficiency frequency, and the compressor is not operating at the optimal efficiency. At this time, the drying machine has low operating efficiency and high power consumption, and it is necessary to adjust the moving stroke of the piston to change the operating frequency of the compressor so that the compressor operates near the optimal efficiency.

[0060] Of course, the preset efficiency range is not fixed, and those skilled in the art can adjust its specific range according to needs, as long as it is ensured that the range is near the optimal efficiency frequency.

[0061] Preferably, the step of "if the current frequency is not within the preset frequency range, adjust the moving stroke of the piston" further includes: if the current frequency is less than the minimum value of the preset frequency range, reduce the moving stroke of the piston; if the current frequency is greater than the maximum value of the preset frequency range, increase the moving stroke of the piston.

[0062] Specifically, if the current frequency is less than the minimum value of the preset frequency range, it is necessary to increase the operating frequency of the compressor. Since the actual exhaust volume of the compressor is positively correlated with the frequency of the compressor and the moving stroke of the piston, if it is necessary to keep the actual exhaust volume close to or equal to the optimal exhaust volume and the frequency of the compressor increases, only the moving stroke of the piston needs to be reduced. Conversely, if the current frequency is greater than the maximum value of the preset frequency range, it is necessary to reduce the operating frequency of the compressor, and at this time, only the moving stroke of the piston needs to be increased.

[0063] In a preferred embodiment, the step of reducing the moving stroke of the piston further includes: calculating the stroke to which the piston needs to be reduced by the following formula:

[0064] La = L0×[(fn - 2) / fn] (1)

[0065] In formula (1), La is the stroke to which the piston needs to be reduced; L0 is the initial stroke; fn is the optimal efficiency frequency; (fn - 2) is the minimum value of the preset frequency range.

[0066] In a preferred embodiment, the step of increasing the moving stroke of the piston further includes: calculating the stroke to which the piston needs to be increased by the following formula:

[0067] L = L0×[(fn + 2) / fn] (2)

[0068] In formula (2), L is the stroke to which the piston needs to be increased; L0 is the initial stroke; fn is the optimal efficiency frequency; (fn + 2) is the maximum value of the preset frequency range.

[0069] By using the above formulas (1) and (2) to calculate the stroke to which the piston needs to be increased or reduced, the present application can achieve smooth adjustment of the compressor frequency until the compressor runs at or near the optimal efficiency frequency, so as to improve the working efficiency of the dryer and reduce energy consumption.

[0070] In a preferred embodiment, the control method further includes: obtaining the drying gear; and determining the initial stroke of the piston according to the drying gear.

[0071] Specifically, the drying gear is selected by the user or determined by the dryer according to the information of the clothes to be dried, which reflects the drying speed and efficiency required by the user. Moreover, each drying gear corresponds to an initial stroke of the piston. When the drying gear is determined, the initial stroke of the piston is also determined accordingly. Among them, the relationship between the drying gear and the initial stroke of the piston is determined by a comparison table, or determined according to an empirical formula or a piecewise function, etc.

[0072] By determining the initial stroke of the piston based on the drying gear, the control method of the present application can determine the initial stroke of the piston according to the drying speed and efficiency required by the user, so that the compressor is more likely to reach the optimal operating frequency when operating with this initial stroke, thereby reducing the adjustment time and improving the operating efficiency.

[0073] In a preferred technical solution, the step of "determining the optimal displacement volume of the compressor according to the information of the clothes to be dried" further includes: obtaining the weight and volume of the clothes to be dried; determining the optimal displacement volume of the compressor according to the weight and volume of the clothes to be dried.

[0074] For example, after the clothes to be dried are put into the cabinet, obtain the weight and volume of the clothes to be dried. For example, use a weight sensor to obtain the weight of the clothes to be dried, take a photo inside the cabinet, and estimate the volume of the clothes to be dried according to image recognition technology. The above methods of estimating weight and volume are relatively common in the art, so they will not be elaborated here. After obtaining the weight and volume of the clothes to be dried, determine the optimal displacement volume of the compressor according to the two. Preferably, determine the optimal displacement volume based on a comparison table between the volume and weight of the clothes to be dried and the optimal displacement volume of the compressor. This comparison table can be obtained through a large number of experiments, and determine the displacement volume when the clothes to be dried reach the optimal efficiency and drying effect under different weights and volumes through experiments as the optimal displacement volume.

[0075] Of course, in addition to obtaining the optimal displacement volume through the comparison table, it can also be obtained through fitting formulas, piecewise functions, etc. The specific formulas and function methods can also be determined based on experiments, which will not be elaborated here.

[0076] In a preferred technical solution, the actual displacement volume is calculated and determined by the following formula:

[0077] Q = f × L × π × (d / 2) 2 (3)

[0078] In formula (3), Q is the actual displacement volume, with the unit of m 3 / s; f is the frequency of the compressor, with the unit of Hz; L is the moving stroke of the piston, with the unit of m; d is the diameter of the cylinder block, with the unit of m.

[0079] By calculating the actual displacement volume through formula (3), the actual displacement volume of the compressor can be accurately obtained, improving the control accuracy of the control method of the present application.

[0080] In a preferred technical solution, the piston is connected to an adjustable elastic spring, and the step of "adjusting the moving stroke of the piston" further includes: adjusting the moving stroke of the piston by adjusting the elastic force of the adjustable elastic spring.

[0081] As described above, the elastic force of the elastic spring can be adjusted in various ways. After calculating the stroke to which the piston needs to be increased or decreased, the elastic force of the elastic spring is adjusted, such as by adjusting the current of the electromagnetic spring, the air pressure of the air spring, the air pressure of the pneumatic spring, the position of the push plate / inner push rod of the mechanically adjustable spring, etc., to adjust the elastic force of the elastic spring, and then adjust the moving stroke of the piston.

[0082] By adjusting the elastic force of the elastic spring to adjust the moving stroke of the piston, precise adjustment of the piston moving stroke can be achieved, which is beneficial for the compressor to finally operate at the optimal efficiency frequency.

[0083] A possible control process of the present application will be introduced below.

[0084] After the user puts the clothes to be dried into the dryer and selects the drying gear, the dryer is started. At this time, the weight sensor in the barrel detects the weight of the clothes to be dried, and the image sensor detects the volume of the clothes to be dried. The corresponding optimal exhaust volume is selected from the comparison table according to the weight and volume of the clothes to be dried, and the initial stroke of the cylinder is initially selected according to the gear. Then, the compressor is controlled to start and run according to the optimal exhaust volume and the initial stroke. After the actual exhaust volume of the compressor reaches the optimal exhaust volume, it is determined whether the operating frequency f of the compressor satisfies fn - 2 ≤ f ≤ fn + 2. If so, the compressor continues to run at the existing frequency until the end of this drying program. If not, the cylinder stroke is adjusted. If f < fn - 2, the cylinder stroke is reduced to La = L0 × [(fn - 2) / fn], and then it returns to the judgment; if f > fn + 2, the cylinder stroke is increased to Lb = L0 × [(fn + 2) / fn], and after adjustment, it continues to run and detect until the compressor runs into the optimal efficiency range, and then keeps running in this state until the end of this drying program.

[0085] Those skilled in the art can understand that although the above embodiments are described in combination with the dryer, this is not intended to limit the application scope of the present application. Without departing from the principle of the present application, those skilled in the art can apply the above control method to other application scenarios to improve the applicability of the present application. For example, the present application can also be applied to a washing and drying integrated machine, etc.

[0086] Each component embodiment of the present application can be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) can be used in practice to implement some or all of the functions of some or all of the components in the server and the client according to the embodiments of the present application. The present application can also be implemented as a device or device program for executing part or all of the methods described herein (for example, a PC program and a PC program product). Such a program for implementing the present application can be stored on a PC-readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0087] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims of the present application, any one of the claimed embodiments can be used in any combination.

[0088] It should be noted that although the detailed steps of the method of the present application are described in detail above, without departing from the basic principle of the present application, those skilled in the art can combine, split, and change the order of the above steps. The technical solutions modified in this way do not change the basic concept of the present application, and thus also fall within the protection scope of the present application.

[0089] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present application.

Claims

1. A drying control method for a laundry treatment device, characterized in that, The clothes processing device includes a box body, a drying air duct, a variable-capacity variable-frequency compressor, a condenser, a throttling device and an evaporator. The box body has an air inlet and an air outlet, and the air inlet and the air outlet are respectively communicated with the drying air duct. The variable-capacity variable-frequency compressor, the condenser, the throttling device and the evaporator are sequentially connected through a refrigerant pipeline. The condenser and the evaporator are arranged in the drying air duct. The variable-capacity variable-frequency compressor includes a cylinder block and a piston slidably arranged in the cylinder block, and the moving stroke of the piston in the cylinder block is adjustable. The control method includes: Determine the optimal displacement of the compressor according to the information of the clothes to be dried; Obtain the initial stroke of the piston; Control the piston of the compressor to operate according to the initial stroke and adjust the frequency of the compressor so that the actual displacement of the compressor is equal to the optimal displacement, or the difference between the actual displacement and the optimal displacement is within a preset difference range; Obtain the current frequency of the compressor and determine whether the current frequency is within a preset frequency range; Selectively adjust the moving stroke of the piston according to the judgment result.

2. The drying control method of the laundry treating device according to claim 1, wherein, The step of "selectively adjusting the moving stroke of the piston according to the judgment result" further includes: If the current frequency is within the preset frequency range, control the compressor to continue operating at the current frequency; If the current frequency is not within the preset frequency range, adjust the moving stroke of the piston.

3. The drying control method of the laundry treatment device according to claim 2, characterized in that, The step of "if the current frequency is not within the preset frequency range, adjust the moving stroke of the piston" further includes: If the current frequency is less than the minimum value of the preset frequency range, reduce the moving stroke of the piston; If the current frequency is greater than the maximum value of the preset frequency range, increase the moving stroke of the piston.

4. The drying control method of the laundry treatment device according to claim 3, characterized in that, The preset frequency range is determined based on the optimal efficiency frequency of the compressor.

5. The drying control method of the laundry treatment device according to claim 4, wherein The step of "reducing the moving stroke of the piston" further includes: Calculate the stroke to which the piston needs to be reduced through the following formula: La = L0×[(fn - 2) / fn] Where, La is the stroke to which the piston needs to be reduced; L0 is the initial stroke; fn is the optimal efficiency frequency; (fn - 2) is the minimum value of the preset frequency range.

6. The drying control method of the laundry treatment device according to claim 4, characterized in that The step of "increasing the moving stroke of the piston" further includes: Calculate the stroke to which the piston needs to be increased through the following formula: Lb = L0×[(fn + 2) / fn] Where, Lb is the stroke to which the piston needs to be increased; L0 is the initial stroke; fn is the optimal efficiency frequency; (fn + 2) is the maximum value of the preset frequency range.

7. The drying control method of the clothing treatment device according to claim 1, characterized in that, The control method further includes: Obtain the drying gear; Determine the initial stroke of the piston according to the drying gear.

8. The drying control method of the laundry treatment device according to claim 1, characterized in that The step of "determining the optimal displacement of the compressor according to the information of the clothes to be dried" further includes: Obtain the weight and volume of the clothes to be dried; Determine the optimal displacement of the compressor according to the weight and volume of the clothes to be dried.

9. The drying control method of the laundry treatment device according to claim 1, characterized in that, The actual displacement is calculated and determined through the following formula: Q = f × L × π × (d / 2) 2 Wherein, Q is the actual displacement; f is the frequency of the compressor; L is the moving stroke of the piston; and d is the diameter of the cylinder block.

10. The drying control method of the laundry treatment device according to claim 1, characterized in that, The piston is connected to an adjustable elastic spring. The step of "adjusting the moving stroke of the piston" further includes: Adjusting the moving stroke of the piston by adjusting the elastic force of the adjustable elastic spring.

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