Heat pump dryer control method, device, heat pump dryer and storage medium

Abstract

The present application provides a heat pump dryer control method, device, heat pump dryer and storage medium, which obtains the ambient temperature, the compressor displacement in the heat pump dryer and the load of the heat pump dryer; then controls the operation of the motor of the heat pump dryer according to the ambient temperature, the compressor displacement and the load. In the embodiment of the present application, since the heat pump dryer is controlled according to the ambient temperature, the compressor displacement and the load, not only the control of the motor of the heat pump dryer is achieved, but also energy consumption can be saved.

Description

Technical Field

[0001] This invention belongs to the technical field of heat pump dryers, specifically relating to a control method, device, heat pump dryer, and storage medium for a heat pump dryer. Background Technology

[0002] In clothes dryers, heat pump technology is the most efficient way to save energy during the drying process and is therefore widely used. The operation of a clothes dryer with a heat pump system (referred to as a heat pump dryer) consists of two phases: a preheating phase and a steady-state phase. The preheating phase is the initial phase after the compressor has been started, during which a certain amount of time is required to reach full operating temperature and pressure. When the heat pump system starts, the air and refrigerant temperatures are at ambient temperature. During the transition phase from the preheating phase to the steady-state phase, the air and refrigerant temperatures rise to the desired level. In the steady-state phase, the air and refrigerant temperatures remain statically constant.

[0003] In the prior art, during the drying process of clothes, the motor of the heat pump dryer runs at its maximum speed continuously, which in turn causes the drum of the heat pump dryer to rotate at its maximum speed continuously.

[0004] However, in existing technologies, the motors of heat pump dryers run at maximum speed during the drying stage, which results in energy waste. Summary of the Invention

[0005] This application provides a control method, device, heat pump dryer, and storage medium for a heat pump dryer, which realizes the control of the motor of the heat pump dryer and can save energy.

[0006] In a first aspect, embodiments of this application provide a control method for a heat pump dryer, including:

[0007] Obtain the ambient temperature, the compressor displacement in the heat pump dryer, and the load of the heat pump dryer;

[0008] The operation of the heat pump dryer's motor is controlled based on the ambient temperature, compressor displacement, and load.

[0009] In this embodiment, by controlling the heat pump dryer according to the ambient temperature, compressor displacement and load, not only is the motor of the heat pump dryer controlled, but energy consumption can also be saved.

[0010] In one possible implementation, controlling the operation of the heat pump dryer's motor based on ambient temperature, compressor displacement, and load includes:

[0011] The rotational speed of the motor is determined as the first rotational speed;

[0012] The duration for which the motor operates at the first rotational speed is determined based on the ambient temperature, compressor displacement, and load.

[0013] In this embodiment, the motor of the heat pump dryer is controlled by first determining the motor's rotation speed as a first rotation speed, wherein the first rotation speed is less than the motor's maximum rotation speed, and then determining the duration for which the motor runs at the first rotation speed based on the ambient temperature, compressor displacement, and load.

[0014] In one possible implementation, controlling the operation of the heat pump dryer's motor based on ambient temperature, compressor displacement, and load includes:

[0015] Determine the second rotational speed of the motor based on the ambient temperature and load.

[0016] Determine the duration for which the motor operates at the second rotational speed based on the compressor displacement.

[0017] In this embodiment, the second rotation speed of the motor is determined by the ambient temperature and load, and then the duration of the motor running at the second rotation speed is determined by the compressor displacement, thereby realizing the control of the motor of the heat pump dryer.

[0018] In one possible implementation, determining the second rotational speed of the motor based on the ambient temperature and load includes:

[0019] If the ambient temperature is lower than the first preset temperature and / or the load is greater than the preset load, then the motor rotation speed is determined to be the second rotation speed.

[0020] In one possible implementation, the compressor displacement is negatively correlated with the duration for which the motor operates at the second rotational speed.

[0021] In one possible implementation, the embodiments of this application further include:

[0022] Obtain the temperature inside the drum of the heat pump dryer;

[0023] The third rotation speed of the motor is determined based on the temperature inside the barrel.

[0024] In this embodiment, by obtaining the drum temperature of the heat pump dryer during the drying stage and determining the third rotation speed of the motor based on the drum temperature, the reliability of motor control is improved.

[0025] In one possible implementation, determining the third rotational speed of the motor based on the temperature inside the barrel includes:

[0026] If the temperature inside the barrel reaches the second preset temperature and / or the rate of temperature increase inside the barrel reaches a preset threshold, then the rotation speed of the motor is determined to be the third rotation speed, which is less than or equal to the maximum rotation speed of the motor.

[0027] The following describes the apparatus, dryer, computer-readable storage medium, and computer program product provided in the embodiments of this application. The content and effects can be referred to the heat pump dryer control method provided in the embodiments of this application, and will not be repeated here.

[0028] Secondly, embodiments of this application provide a heat pump dryer control device, comprising:

[0029] The acquisition module is used to acquire ambient temperature, compressor displacement in the heat pump dryer, and load of the heat pump dryer;

[0030] The control module is used to control the operation of the heat pump dryer's motor based on ambient temperature, compressor displacement, and load.

[0031] In one possible implementation, the control module is configured to:

[0032] The rotational speed of the motor is determined as the first rotational speed;

[0033] The duration for which the motor operates at the first rotational speed is determined based on the ambient temperature, compressor displacement, and load.

[0034] In one possible implementation, the control module is configured to:

[0035] Determine the second rotational speed of the motor based on the ambient temperature and load.

[0036] Determine the duration for which the motor operates at the second rotational speed based on the compressor displacement.

[0037] In one possible implementation, the control module is specifically used for:

[0038] If the ambient temperature is lower than the first preset temperature and / or the load is greater than the preset load, then the motor rotation speed is determined to be the second rotation speed.

[0039] In one possible implementation, the compressor displacement is negatively correlated with the duration for which the motor operates at the second rotational speed.

[0040] In one possible implementation, this application provides a heat pump dryer control device.

[0041] The acquisition module is also used to acquire the temperature inside the drum of the heat pump dryer;

[0042] The control module is also used to determine the third rotation speed of the motor based on the temperature inside the barrel.

[0043] In one possible implementation, the heat pump dryer control device and control module provided in this application embodiment are specifically used for:

[0044] If the temperature inside the barrel reaches the second preset temperature and / or the rate of temperature increase inside the barrel reaches a preset threshold, then the rotation speed of the motor is determined to be the third rotation speed, which is less than or equal to the maximum rotation speed of the motor.

[0045] The heat pump dryer control method, apparatus, heat pump dryer, and storage medium provided in this application acquire ambient temperature, compressor displacement, and load of the heat pump dryer; then, based on these parameters, the operation of the heat pump dryer motor is controlled. In this embodiment, by controlling the heat pump dryer based on ambient temperature, compressor displacement, and load, not only is control of the heat pump dryer motor achieved, but energy consumption is also saved. Attached Figure Description

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0047] Figure 1 This is an exemplary application scenario diagram provided in an embodiment of this application;

[0048] Figure 2 This is a schematic flowchart of a heat pump dryer control method provided in an embodiment of this application;

[0049] Figure 3 This is a schematic flowchart of a heat pump dryer control method provided in another embodiment of this application;

[0050] Figure 4 This is a schematic diagram of the structure of a heat pump dryer control device provided in an embodiment of this application;

[0051] Figure 5 This is a schematic diagram of the structure of the heat pump dryer provided in the embodiments of this application. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0054] The operation of a heat pump dryer includes two stages: a preheating stage and a steady-state stage. The preheating stage is the initial stage after the compressor has been started, during which a certain amount of time is required to reach full operating temperature and pressure. When the heat pump system starts, the air and refrigerant temperatures are at ambient temperature. During the transition from the preheating stage to the steady-state stage, the air and refrigerant temperatures rise to the desired level. In the steady-state stage, the air and refrigerant temperatures remain statically constant. In existing technology, during the drying process, the motor of the heat pump dryer continuously operates at maximum speed, causing the drum to rotate at maximum speed continuously without adjusting the motor speed. Especially in the early stages of the drying process, when the temperature inside the drum is low, the motor operates at maximum speed, resulting in wasted energy. To solve the above technical problems, embodiments of this application provide a heat pump dryer control method, device, heat pump dryer, and storage medium.

[0055] The inventive concept of the heat pump dryer control method, device, heat pump dryer, and storage medium provided in this application embodiment lies in the fact that, since the temperature inside the drum of the heat pump dryer is relatively low in the early stage of the drying process, the motor of the heat pump dryer does not need to operate at its maximum speed. Furthermore, the initial temperature and the rate of temperature increase inside the drum are related to the ambient temperature, the compressor displacement, and the load of the heat pump dryer. Therefore, the rotation speed of the heat pump dryer motor and the duration of operation at that speed can be controlled based on the ambient temperature, compressor displacement, and load. This not only achieves control of the heat pump dryer motor but also saves energy.

[0056] The heat pump dryer control method provided in this application embodiment can be executed by the heat pump dryer control device provided in this application embodiment. The heat pump dryer control device provided in this application embodiment can be part or all of the heat pump dryer. Figure 1 This is an exemplary application scenario diagram provided in the embodiments of this application, such as... Figure 1 As shown in the embodiments of this application, the heat pump dryer control method can be applied to the heat pump dryer 11. Users can operate the heat pump dryer; for example, they can operate it through the control panel on the heat pump dryer 11, or they can communicate with the terminal device 12. The terminal device 12 can control the heat pump dryer 11. This application does not limit the type of heat pump dryer, nor does it limit the specific type of terminal device. For example, the terminal device can be a smartphone, personal computer, tablet computer, wearable device, vehicle terminal, etc.

[0057] Figure 2 This is a flowchart illustrating a heat pump dryer control method according to an embodiment of this application. The method can be executed by a heat pump dryer control device, which can be implemented through software and / or hardware. For example, the device can be part or all of the heat pump dryer. The following description uses the heat pump dryer as the executing entity to illustrate the heat pump dryer control method. Figure 2 As shown, the heat pump dryer control method provided in this application embodiment may include:

[0058] Step S101: Obtain the ambient temperature, the compressor displacement in the heat pump dryer, and the load of the heat pump dryer.

[0059] Ambient temperature can be obtained through a temperature sensor connected to the heat pump dryer. The temperature sensor can be integrated into the heat pump dryer or set independently. Alternatively, ambient temperature can be obtained by reading the air inlet temperature of the heat pump dryer's condenser; this embodiment is merely an example and is not limited to this method.

[0060] For a given heat pump dryer, its compressor displacement is a fixed value. For example, the compressor displacement of a heat pump dryer typically uses any of the following specifications, such as 12.20 cubic centimeters per revolution (cm³ / r), 8.80 cm³ / r, 7.25 cm³ / r, and 6.45 cm³ / r, etc. This application embodiment does not impose any limitations on this. The compressor displacement of the heat pump dryer can be obtained directly by reading the compressor displacement information of the heat pump dryer, or it can be obtained by receiving the compressor displacement input by the user. This application embodiment is only using this as an example and is not limited to this.

[0061] This application does not limit the specific implementation method for obtaining the load capacity of the heat pump dryer. For example, the load capacity can be determined by collecting the humidity value inside the heat pump dryer drum, where there is a positive correlation between the humidity value and the load capacity. Another example is that the load capacity can be determined by obtaining the weight of the clothes to be dried, where there is also a positive correlation between the weight of the clothes to be dried and the load capacity. Yet another example is that the load capacity of the heat pump dryer can be obtained by receiving the load capacity input by the user. This application embodiment is merely an example and is not limited to these methods.

[0062] The timing for obtaining the ambient temperature, the compressor displacement in the heat pump dryer, and the load of the heat pump dryer can be either during the preheating stage when the heat pump dryer starts the drying program, or before the heat pump dryer starts the drying program. This application embodiment is only an example of this.

[0063] Step S102: Control the operation of the heat pump dryer motor according to the ambient temperature, compressor displacement and load.

[0064] Controlling the operation of the motor in a heat pump dryer can include controlling the motor's rotation speed and the duration for which the motor operates at that speed. The operation of the heat pump dryer's motor is controlled based on the ambient temperature, compressor displacement, and load. Specifically, the motor's rotation speed and the duration for which the motor operates at that speed are controlled based on the ambient temperature, compressor displacement, and load.

[0065] In one possible implementation, the motor rotation speed can be determined based on any one or more of the ambient temperature, compressor displacement, and load. Then, the duration for which the motor operates at that rotation speed can be determined based on parameters other than those used to determine the motor rotation speed. For example, the motor rotation speed can be determined based on the ambient temperature, and the duration for which the motor operates at that rotation speed can be determined based on the load and compressor displacement. This embodiment is only an example and is not limited thereto.

[0066] In another possible implementation, the motor rotation speed can be preset, and then the duration for which the motor operates at that speed can be determined based on any one or more of the ambient temperature, compressor displacement, and load. For example, controlling the motor operation of a heat pump dryer based on ambient temperature, compressor displacement, and load includes:

[0067] The motor's rotational speed is determined as the first rotational speed; based on the ambient temperature, compressor displacement, and load, the duration for which the motor operates at the first rotational speed is determined.

[0068] The first rotational speed is less than the maximum rotational speed of the motor. By reducing the motor's rotational speed, energy consumption can be saved while maintaining the drying efficiency of the heat pump dryer. In one possible implementation, the maximum rotational speed of the motor is 2800 revolutions per minute (RPM), and the first rotational speed can be 2000 RPM, 1800 RPM, 1500 RPM, etc. This embodiment is only an example and is not limited to this.

[0069] After determining the motor's rotational speed, this application embodiment does not limit the specific implementation method for determining the duration of the motor's operation at the first rotational speed based on ambient temperature, compressor displacement, and load. For example, the duration of the motor's operation at the first rotational speed can be determined by setting a correspondence list between ambient temperature, compressor displacement, load, and the duration of the motor's operation at the first rotational speed. This correspondence list can be set by defining the duration of the motor's operation at the first rotational speed for each compressor displacement within different ambient temperature and load ranges. Table 1 is an exemplary correspondence list provided in this application embodiment.

[0070] Table 1

[0071]

[0072] As shown in Table 1, when the load is greater than or equal to 3 kg, the ambient temperature is greater than or equal to 20 degrees Celsius, and the compressor displacement is 12.2 cm3 / r, the duration of the motor running at the first rotation speed is 30 minutes. Other information in the table will not be repeated in this embodiment.

[0073] In this embodiment, the motor of the heat pump dryer is controlled by first determining the motor's rotation speed as a first rotation speed, wherein the first rotation speed is less than the motor's maximum rotation speed, and then determining the duration for which the motor runs at the first rotation speed based on the ambient temperature, compressor displacement, and load.

[0074] In another possible implementation, controlling the operation of the heat pump dryer's motor based on ambient temperature, compressor displacement, and load includes:

[0075] The second rotational speed of the motor is determined based on the ambient temperature and load; the duration for which the motor operates at the second rotational speed is determined based on the compressor displacement.

[0076] The second rotational speed of the motor is less than its maximum rotational speed. The specific value of the second rotational speed is determined based on the ambient temperature and load. For example, the lower the ambient temperature and the greater the load, the lower the second rotational speed; conversely, the higher the ambient temperature and the smaller the load, the greater the second rotational speed. After determining the second rotational speed, the duration for which the motor operates at the second rotational speed is determined based on the compressor displacement. In one possible implementation, the compressor displacement is negatively correlated with the duration of operation at the second rotational speed.

[0077] This application does not limit the specific implementation of determining the second rotational speed of the motor based on ambient temperature and load. In one possible implementation, determining the second rotational speed of the motor based on ambient temperature and load includes:

[0078] If the ambient temperature is lower than the first preset temperature and / or the load is greater than the preset load, then the motor rotation speed is determined to be the second rotation speed.

[0079] The first preset temperature can be 15 degrees Celsius (°C), 20°C or 25°C, the preset load can be 2.5 kg, 3 kg, 4 kg or so, and the second rotation speed can be 2000 RPM, 1800 RPM, 1500 RPM or so. This application embodiment is only an example and is not limited thereto.

[0080] In this embodiment, the second rotation speed of the motor is determined by the ambient temperature and load, and then the duration of the motor running at the second rotation speed is determined by the compressor displacement, thereby realizing the control of the motor of the heat pump dryer.

[0081] In one possible implementation, as the heat pump dryer operates, the temperature inside the dryer drum gradually increases; based on this... Figure 3 This is a flowchart illustrating a heat pump dryer control method according to another embodiment of this application. This method can be executed by a heat pump dryer control device, which can be implemented through software and / or hardware. For example, the device can be part or all of the heat pump dryer. The following description uses the heat pump dryer as the executing entity to illustrate the heat pump dryer control method. Figure 3 As shown in the embodiments of this application, the heat pump dryer control method may further include:

[0082] Step S201: Obtain the temperature inside the drum of the heat pump dryer.

[0083] This application does not limit the specific implementation method of obtaining the temperature inside the drum of the heat pump dryer. For example, it can be obtained by a temperature sensor inside the drum of the heat pump dryer. This application only uses this as an example.

[0084] Step S202: Determine the third rotation speed of the motor based on the temperature inside the barrel.

[0085] After obtaining the temperature inside the barrel, the rotation speed of the motor can be adjusted to a third rotation speed based on the temperature inside the barrel. In one possible implementation, determining the third rotation speed of the motor based on the temperature inside the barrel includes: if the temperature inside the barrel reaches a second preset temperature and / or the rate of increase of the temperature inside the barrel reaches a preset threshold, then the rotation speed of the motor is determined to be the third rotation speed, and the third rotation speed is less than or equal to the maximum rotation speed of the motor.

[0086] For example, if the motor of the heat pump dryer operates at a first rotation speed, and the temperature inside the drum gradually rises, if the temperature inside the drum reaches a second preset temperature, the motor rotation speed is adjusted to a third rotation speed; or, if the rate of temperature increase inside the drum reaches a preset threshold, the motor rotation speed is adjusted to a third rotation speed; or, if the temperature inside the drum reaches the second preset temperature and the rate of temperature increase inside the drum reaches a preset threshold, the motor rotation speed is adjusted to a third rotation speed. This application does not limit the specific values ​​of the second preset temperature and the preset threshold. For example, the second preset temperature can be 40°C, 50°C, 60°C, etc., and the preset threshold can be 5 degrees Celsius per minute, etc.

[0087] In this embodiment, by obtaining the drum temperature of the heat pump dryer during the drying stage and determining the third rotation speed of the motor based on the drum temperature, the reliability of motor control is improved.

[0088] The following are device embodiments of the present application, which can be used to implement the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

[0089] Figure 4 This is a schematic diagram of the structure of a heat pump dryer control device provided in an embodiment of this application. This device can be implemented through software and / or hardware, such as... Figure 4 As shown, the heat pump dryer control device provided in this application embodiment may include:

[0090] The acquisition module 41 is used to acquire the ambient temperature, the compressor displacement in the heat pump dryer, and the load of the heat pump dryer.

[0091] The control module 42 is used to control the operation of the motor of the heat pump dryer according to the ambient temperature, compressor displacement and load.

[0092] In one possible implementation, the control module 42 is configured to:

[0093] The rotational speed of the motor is determined as the first rotational speed.

[0094] The duration for which the motor operates at the first rotational speed is determined based on the ambient temperature, compressor displacement, and load.

[0095] In one possible implementation, the control module 42 is configured to:

[0096] The second rotational speed of the motor is determined based on the ambient temperature and load; the duration for which the motor operates at the second rotational speed is determined based on the compressor displacement.

[0097] In one possible implementation, the control module 42 is specifically used for:

[0098] If the ambient temperature is lower than the first preset temperature and / or the load is greater than the preset load, then the motor rotation speed is determined to be the second rotation speed.

[0099] In one possible implementation, the compressor displacement is negatively correlated with the duration for which the motor operates at the second rotational speed.

[0100] In one possible implementation, this application provides a heat pump dryer control device.

[0101] The acquisition module 41 is also used to acquire the temperature inside the drum of the heat pump dryer;

[0102] The control module 42 is also used to determine the third rotation speed of the motor based on the temperature inside the barrel.

[0103] In one possible implementation, the heat pump dryer control device provided in this application embodiment, control module 42, is specifically used for:

[0104] If the temperature inside the barrel reaches the second preset temperature and / or the rate of temperature increase inside the barrel reaches a preset threshold, then the rotation speed of the motor is determined to be the third rotation speed, which is less than or equal to the maximum rotation speed of the motor.

[0105] The device embodiments provided in this application are merely illustrative. Figure 4 The module division described herein is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple modules may be combined or integrated into another system. The coupling between modules can be achieved through interfaces, which are typically electrical communication interfaces, but mechanical interfaces or other forms of interfaces are also possible. Therefore, modules described as separate components may or may not be physically separate; they may be located in one place or distributed across different locations on the same or different devices.

[0106] Figure 5 This is a schematic diagram of the structure of the heat pump dryer provided in the embodiments of this application, as shown below. Figure 5 As shown, the heat pump dryer includes:

[0107] The system includes a processor 51, a memory 52, a transceiver 53, and a computer program. The transceiver 53 enables data transmission with other devices. The computer program is stored in the memory 52 and configured to be executed by the processor 51. The computer program includes instructions for performing the method for determining the washing mode described above. The content and effects of the instructions are described in the method embodiment.

[0108] Furthermore, embodiments of this application also provide a computer-readable storage medium storing computer-executable instructions, wherein when at least one processor of a user device executes the computer-executable instructions, the user device performs the various possible methods described above.

[0109] Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of computer programs from one place to another. Storage media can be any available medium accessible to a general-purpose or special-purpose computer. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. Alternatively, the ASIC can reside in a user device. Of course, the processor and storage medium can also exist as discrete components in a communication device.

[0110] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

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

Claims

1. A heat pump dryer control method, characterized in that: include: Acquiring an ambient temperature, a compressor displacement in a heat pump clothes dryer, and a load of the heat pump clothes dryer; Determining that the rotation speed of the motor of the heat pump dryer is a first rotation speed, wherein the first rotation speed is less than the maximum rotation speed of the motor; Determining a duration for the motor to run at the first rotation speed according to the ambient temperature, the compressor displacement, and the load, and controlling the motor to run at the first rotation speed for the duration; or, Determining a second rotation speed of the motor according to the ambient temperature and the load; A duration for which the motor operates at the second rotation speed is determined according to the compressor displacement, and the motor is controlled to operate at the second rotation speed for the duration.

2. The method according to claim 1, characterized in that The step of determining the second rotation speed of the motor according to the ambient temperature and the load comprises: If the ambient temperature is lower than a first preset temperature and / or the load is greater than a preset load, the rotation speed of the motor is determined to be the second rotation speed.

3. The method according to claim 2, characterized in that The compressor displacement is inversely related to a duration that the electric machine operates at the second rotational speed.

4. The method according to claim 1, characterized in that: Also includes: Obtaining the temperature inside the barrel of the heat pump dryer; The third rotation speed of the motor is determined according to the temperature in the barrel.

5. The method according to claim 4, characterized in that The step of determining the third rotation speed of the motor according to the temperature in the barrel includes: If the temperature in the barrel reaches a second preset temperature and / or the rate of increase of the temperature in the barrel reaches a preset threshold, the rotation speed of the motor is determined to be the third rotation speed, and the third rotation speed is less than or equal to the maximum rotation speed of the motor.

6. A heat pump clothes dryer control device, characterized in that: Used to execute the heat pump dryer control device as described in any one of claims 1-5.

7. A heat pump clothes dryer, characterized in that: include: at least one processor; as well as a memory communicatively coupled to the at least one processor; in The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium storing computer instructions, characterized in that: The computer instructions are used to cause the computer to execute the method according to any one of claims 1 to 5.

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