Dryer

Abstract

The embodiment of the invention provides a drying machine. The drying machine comprises a box body; the roller is arranged in the box body; the heat pump system is used for conveying heated air into the roller; the driving motor is used for providing rotating power for the roller; the humidity sensor is used for detecting the humidity of clothes in the roller; the controller is electrically connected with the driving motor, the heat pump system and the humidity sensor, and the controller is configured to execute the following steps that in response to a preset clothes drying instruction, a clothes drying program is started, and a first humidity value and a first weight value of clothes are obtained; when the clothes are dried to a preset time length, a second humidity value and a second weight value of the clothes are obtained; determining the moisture content of the clothes according to the first humidity value, the second humidity value, the first weight value and the second weight value; determining residual drying time according to the second weight value and the water content; and after the clothes are dried to the remaining drying duration, the clothes drying procedure is ended. The drying time can be accurately controlled to improve the drying effect.

Description

Technical Field

[0001] This application relates to the technical field of dryers, and particularly to a dryer. Background Art

[0002] A dryer is a household appliance used to dry wet clothes. The dryer heats fresh cold air into dry hot air through a heat pump device, and then uses the dry hot air to exchange heat with the clothes tumbling in the drum, so that the moisture in the clothes in the drum gradually evaporates under the sufficient heat exchange with the dry hot air, thus realizing the drying of the clothes. However, the drying degree of the clothes is closely related to the drying duration. If the drying time is too long, the clothes will be over-dried, affecting the comfort of the clothes. If the drying time is too short, the clothes cannot be completely dried and still contain moisture inside. Therefore, in order to ensure the drying effect of the dryer, the dryer needs to control the drying duration.

[0003] Currently, the way to determine the drying duration is to set a humidity sensor inside the drum, use the humidity sensor to detect the humidity value of the clothes, and determine whether the clothes are dried according to the humidity value to determine whether to stop drying, thus realizing the control of the drying duration. However, the humidity value detected by the humidity sensor can only represent the humidity value of the local part of the clothes it touches, and cannot represent the humidity of all the clothes. Therefore, controlling the drying duration according to the humidity value detected by the humidity sensor still cannot ensure the drying effect of the clothes.

[0004] Therefore, there is an urgent need for a dryer that can accurately control the drying duration to improve the drying effect. Summary of the Invention

[0005] To solve the above technical problems, an embodiment of this application provides a dryer.

[0006] According to one aspect of the embodiments of this application, an embodiment of this application provides a dryer, including: a box body; a drum and a heat pump system disposed inside the box body, the heat pump system being configured to convey heated air into the drum; a driving motor for providing rotational power to the drum; a humidity sensor for detecting the humidity of the clothes inside the drum; a controller electrically connected to the driving motor and the humidity sensor, the controller being configured to perform the following steps: in response to a preset clothes drying instruction, start a clothes drying program, and obtain a first humidity value of the clothes inside the drum and a first weight value of the clothes; when drying reaches a preset duration, obtain a second humidity value of the clothes and a second weight value of the clothes; determine the moisture content of the clothes according to the first humidity value, the second humidity value, the first weight value and the second weight value; determine the remaining drying duration according to the second weight value and the moisture content; when drying reaches the remaining drying duration, control to end the clothes drying program.

[0007] In the above embodiment, the moisture content of the clothes is determined by the first moisture value and the first weight value of the clothes in the drum when the clothes drying program is started and the second moisture value and the second weight value of the clothes when drying to a preset duration. It is possible to determine the moisture content according to the change of moisture and weight during the preset duration of clothes drying, so that the moisture content can reflect the overall moisture condition of the clothes. Compared with directly controlling the drying duration based on the moisture value detected by the moisture sensor, the remaining drying duration is accurately determined according to the moisture content and the second weight value of the clothes. Then, when drying reaches the remaining drying duration, the clothes drying program is controlled to end, achieving precise control of the clothes drying duration, thereby improving the drying effect.

[0008] In an embodiment of the present application, based on the foregoing solution, the controller is further configured to perform the following steps: when starting the clothes drying program, obtain the first acceleration current of the drive motor in the first acceleration interval and the first uniform motion current in the first uniform motion interval; the first acceleration interval is the time interval during which the drive motor accelerates and rotates when starting the clothes drying program; the first uniform motion interval is the time interval during which the drive motor rotates at a uniform speed when starting the clothes drying program; obtain the first weight value of the clothes according to the first acceleration current and the first uniform motion current.

[0009] In the above embodiment, the first acceleration current of the drive motor in the first acceleration interval and the first uniform motion current in the first uniform motion interval can accurately represent the load of the drum, that is, the weight of the clothes before drying, when starting the clothes drying program, so as to obtain the first weight value of the clothes before drying based on the first acceleration current and the first uniform motion current.

[0010] In an embodiment of the present application, based on the foregoing solution, the controller is further configured to perform the following steps: obtain the first current difference between the first acceleration current and the first uniform motion current; perform a search operation in a preset first database using the first current difference; the preset first database stores the corresponding relationship between the reference weight value and the reference current difference; when finding the reference current difference that is the same as the first current difference, determine the reference weight value corresponding to the reference current difference as the first weight value.

[0011] In the above embodiment, by finding the reference current difference that is the same as the first current difference in the preset first database according to the first current difference between the first acceleration current and the first uniform motion current, it is convenient to determine the reference weight value corresponding to the reference current difference as the first weight value, thereby improving the accuracy of obtaining the first weight value.

[0012] In an embodiment of the present application, based on the foregoing solution, the controller is further configured to perform the following steps: obtaining a first current ratio between the first acceleration current and the first constant-speed current; performing a lookup operation in a preset second database using the first current ratio; the preset second database stores the correspondence between the reference weight value and the reference current ratio; in the case where a reference current ratio identical to the first current ratio is found, determining the reference weight value corresponding to the reference current ratio as the first weight value.

[0013] In the above embodiment, by finding a reference current ratio identical to the first current difference in a preset first database according to the first current ratio between the first acceleration current and the first constant-speed current, so as to determine the reference weight value corresponding to the reference current ratio as the first weight value, thereby improving the accuracy of obtaining the first weight value.

[0014] In an embodiment of the present application, based on the foregoing solution, the controller is further configured to perform the following steps: when drying reaches a preset duration, obtaining a second acceleration current of the drive motor in a second acceleration interval and a second constant-speed current in a second constant-speed interval; the second acceleration interval is the time interval during which the drive motor accelerates and rotates when drying reaches the preset duration; the second constant-speed interval is the time interval during which the drive motor rotates at a constant speed when drying reaches the preset duration; obtaining a second weight value of the clothing according to the second acceleration current and the second constant-speed current.

[0015] In the above embodiment, the second acceleration current of the drive motor in the second acceleration interval and the second constant-speed current in the second constant-speed interval can accurately represent the load of the drum, that is, the weight of the clothing before drying, when drying reaches the preset duration, so as to obtain the second weight value of the clothing when drying reaches the preset duration according to the second acceleration current and the second constant-speed current.

[0016] In an embodiment of the present application, based on the foregoing solution, the controller is further configured to perform the following steps: obtaining a humidity difference between the first humidity value and the second humidity value; obtaining a weight difference between the first weight value and the second weight value; performing a lookup operation in a preset third database using the humidity difference and the weight difference to obtain a moisture content corresponding to both the humidity difference and the weight difference; the preset third database stores the correspondence between the humidity difference, the weight difference, and the moisture content.

[0017] In the above embodiments, the moisture content can be found in a preset third database based on the moisture difference and weight difference before and after the preset drying duration of the clothes, so as to be able to characterize the moisture content situation of the whole clothes, and facilitate the accurate control of the remaining drying duration according to the moisture content and the second weight value.

[0018] In an embodiment of the present application, based on the foregoing solution, the controller is further configured to perform the following steps: perform a search operation in a preset fourth database using the second weight value and the moisture content to obtain the remaining drying duration corresponding to both the second weight value and the moisture content; the corresponding relationship among the second weight value, the moisture content, and the remaining drying duration is stored in the preset fourth database.

[0019] In the above embodiments, the remaining drying duration is found in the preset fourth database through the second weight value and the moisture content, improving the accuracy of obtaining the remaining drying duration.

[0020] In an embodiment of the present application, based on the foregoing solution, the controller is further configured to perform the following steps: obtain the clothing material of the clothes in the drum; determine the remaining drying duration according to the clothing material, the second weight value, and the moisture content.

[0021] In the above embodiments, the remaining drying duration can be determined by combining the clothing material of the clothes, the second weight value, and the moisture content, so that clothes of different materials are not easily damaged due to too long or too short drying duration, improving the user experience.

[0022] In an embodiment of the present application, based on the foregoing solution, the controller is further configured to perform the following steps: adjust the parameters of the heat pump system when the remaining drying duration is greater than a preset reference duration; re-determine the remaining drying duration according to the adjusted parameters of the heat pump system.

[0023] In the above embodiments, when the remaining drying duration is too long, the remaining drying duration can be reduced by adjusting the parameters of the heat pump system, so that while reducing the drying duration, the drying effect is ensured.

[0024] In an embodiment of the present application, based on the foregoing solution, the controller is further configured to perform the following steps: determine a parameter adjustment value according to the remaining drying duration; adjust the parameters of the heat pump system according to the parameter adjustment value.

[0025] In the above embodiments, different parameter adjustment values can be determined for different remaining drying durations. So as to facilitate the adjustment of the parameters of the heat pump system.

[0026] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application. Obviously, the drawings in the following description are only some embodiments of this application, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings:

[0028] Figure 1 is a schematic structural diagram of a dryer shown in an exemplary embodiment of this application;

[0029] Figure 2 is a flowchart of steps executable by a controller in a dryer provided in an exemplary embodiment of this application;

[0030] Figure 3 is a flowchart of steps for obtaining a first weight value provided in an exemplary embodiment;

[0031] Figure 4 is a schematic diagram of a rotation cycle of a drive motor provided in an exemplary embodiment;

[0032] Figure 5 is a flowchart of steps for obtaining a first weight value of clothing according to a first acceleration current and a first constant-speed current provided in an exemplary embodiment of this application;

[0033] Figure 6 is another flowchart of steps for obtaining a first weight value of clothing according to a first acceleration current and a first constant-speed current provided in an exemplary embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. On the contrary, they are merely examples of devices and methods consistent with some aspects of this application as detailed in the appended claims.

[0035] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0036] The flowcharts shown in the accompanying drawings are only illustrative and not necessarily include all the content and operations / steps, nor are they necessarily executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0037] It should also be noted that: the term "a plurality of" mentioned in this application means two or more. The " / or" describes the association relationship of associated objects and indicates that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0038] The terms "first", "second", "third", "fourth", etc. in the description, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. The terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0039] Currently, the way to determine the drying duration is to set a humidity sensor inside the drum, use this humidity sensor to detect the humidity value of the clothes, and determine whether the clothes are dried based on this humidity value to determine whether to stop drying, thereby realizing the control of the drying duration. However, the humidity value detected by the humidity sensor can only represent the humidity value of the local part of the clothes it touches and cannot represent the humidity of all the clothes. Therefore, controlling the drying duration according to the humidity value detected by the humidity sensor still cannot guarantee the drying effect of the clothes.

[0040] To solve the above technical problems, this application proposes a dryer that can accurately control the drying duration to improve the drying effect. Figure 1 It is a schematic structural diagram of the dryer provided by an exemplary embodiment of this application. As Figure 1 shown, the dryer 10 includes a box body 11, a drum 12, a heat pump system 13, a drive motor 14, a humidity sensor 15 and a controller 16. Each part of the dryer 10 will be introduced one by one below.

[0041] The cabinet 11 is the external structure of the dryer 10 and is used to fix and protect the internal components. The cabinet 11 is usually made of metal or plastic; usually, a door is also provided on the cabinet 11 for putting clothes into or taking clothes out of the drum 12, and the door is usually equipped with a sealing ring to prevent water leakage; usually, a display screen and a control panel are also provided on the cabinet 11, and there are buttons, knobs or touch screens on the control panel.

[0042] The drum 12 is arranged inside the cabinet 11 and is usually made of stainless steel. It is used to hold the clothes to be dried and dry the clothes. By rotating, the clothes are evenly heated so as to remove the moisture in the clothes.

[0043] The heat pump system 13 is arranged inside the cabinet 11 and is used to supply dry hot air into the drum. The heat pump system 13 includes a blower, a condenser, an evaporator and a compressor. Among them, the blower is used to inhale fresh cold air from the outside and convey the dry hot air into the drum; the condenser, the evaporator and the compressor are used to heat and dry the fresh cold air to obtain dry hot air.

[0044] The drive motor 14 is the power source of the dryer 10 and is responsible for driving the drum 12 to rotate through rotation to drive the clothes in the drum to flip; in this way, the dry hot air can fully mix and contact with the flipping clothes, improving the drying effect.

[0045] The humidity sensor 15 is arranged inside the drum 12 and is used to detect the humidity value of the clothes in real time during the drying process. The humidity sensor can specifically be a bimetallic strip sensing device, a water-resistant humidity-sensitive resistor sensing device, a ceramic pressure sensing device, a humidity-sensitive capacitor sensing device, an epoxy thermistor sensing device, etc.

[0046] The controller 16 is electrically connected to the drive motor, the heat pump system and the humidity sensor respectively. Please refer to Figure 2 , Figure 2 is the flowchart of the steps executable by the controller in the dryer provided by an exemplary embodiment of the present application. The controller can be configured to directly execute the following steps S210 to step S250:

[0047] Step S210, in response to a preset clothes drying instruction, start the clothes drying program and obtain the first humidity value and the first weight value of the clothes in the drum.

[0048] Step S220, when drying to the preset duration, obtain the second humidity value and the second weight value of the clothes.

[0049] Step S230, determine the moisture content of the clothes according to the first humidity value, the second humidity value, the first weight value and the second weight value of the clothes.

[0050] Step S240: Determine the remaining drying duration based on the second weight value of the clothing and the moisture content of the clothing.

[0051] Step S250: When the drying reaches the remaining drying duration, control to end the clothing drying program.

[0052] The following will describe these 5 steps in detail respectively.

[0053] In step S210, the preset clothing drying instruction is that after the user puts the clothing into the drum, presses the button representing the start of drying on the control panel of the cabinet, that is, issues a preset clothing drying instruction to the dryer. Then the dryer responds to this clothing drying instruction, starts the clothing drying program corresponding to this clothing drying instruction, and obtains the first humidity value and the first weight value of the clothing in the drum.

[0054] The first humidity value of the clothing is obtained by the humidity detected by the humidity sensor when the dryer starts the clothing drying program. Since the drying of the clothing has just started at this time and the moisture in the clothing has not started to evaporate, this first humidity value is actually the humidity value of the clothing before drying.

[0055] It should be noted that the number of humidity sensors provided in the drum may be more than one.

[0056] In an alternative embodiment, there is one humidity sensor provided in the drum. When the clothing drying program is started, the controller determines the humidity value detected by this humidity sensor as the first humidity value of the clothing.

[0057] In another alternative embodiment, there are multiple humidity sensors provided in the drum, and each humidity sensor is respectively arranged in different areas in the drum. When the clothing drying program is started, the controller determines the average value of the humidity values detected by the humidity sensors as the first humidity value of the clothing. In this way, compared with only providing one humidity sensor in the drum, the average value of the humidity values detected by multiple humidity sensors can better represent the overall humidity situation of the clothing in the drum.

[0058] The first weight value of the clothing is the weight of the clothing when the dryer starts the clothing drying program. Since the drying of the clothing has just started at this time and the moisture in the clothing has not started to evaporate, this first humidity value is actually the weight value of the clothing before drying, that is, the sum of the actual weight value of the clothing and the commanded value of the moisture contained in the clothing.

[0059] Please refer to Figure 3 , Figure 3 which is the flowchart of the steps for obtaining the first weight value provided by an exemplary embodiment of the present application. The controller is further configured to execute the following steps S310 to step S320:

[0060] Step 310, when the clothes drying program is started, obtain the first acceleration current of the drive motor in the first acceleration interval and the first constant-speed current in the first constant-speed interval; wherein, the first acceleration interval is the time interval during which the drive motor accelerates and rotates when the clothes drying program is started; the first constant-speed interval is the time interval during which the drive motor rotates at a constant speed when the clothes drying program is started.

[0061] Step 320, obtain the first weight value of the clothes according to the first acceleration current and the first constant-speed current.

[0062] The following describes these two steps in detail respectively.

[0063] In step S310, it should be noted that during the drying process, the rotation of the drive motor is periodic. The rotation period of the drive motor includes a stop rotation time interval, an acceleration rotation time interval, a constant-speed rotation time interval, and a deceleration rotation time interval. Among them, the stop rotation time interval is the time interval during which the rotational speed of the drive motor is 0 rpm; the acceleration rotation time interval is the time interval during which the rotational speed of the drive motor gradually increases from 0 rpm to a preset target rotational speed; the constant-speed rotation time interval is the time interval during which the rotational speed of the drive motor remains at the preset target rotational speed; the deceleration rotation time interval is the time interval during which the rotational speed of the drive motor decreases from the preset target rotational speed to 0 rpm. The preset target rotational speed is between 40 rpm and 60 rpm.

[0064] Figure 4 As shown Figure 4 is a schematic diagram of a rotation period of the drive motor. The preset target rotational speed is 45 rpm. The rotation period of this drive motor starts at time t0. Between time t0 and time t1, the rotational speed of the drive motor is 0 rpm, so the time interval between time t0 and time t1 is the stop rotation time interval; between time t1 and time t2, the rotational speed of the drive motor uniformly accelerates from 0 rpm to the preset target rotational speed of 45 rpm, so the time interval between time t1 and time t2 is the acceleration rotation time interval; between time t2 and time t3, the rotational speed of the drive motor rotates at a constant speed of 45 rpm, so the time interval between time t2 and time t3 is the constant-speed rotation time interval; between time t3 and time t4, the rotational speed of the drive motor uniformly decelerates from 45 rpm to 0 rpm, so the time interval between time t3 and time t4 is the deceleration rotation time interval.

[0065] In one embodiment of the present application, the time interval for the driving motor to accelerate rotation is the acceleration rotation time interval in the rotation period; the time interval for the driving motor to rotate at a constant speed is the constant speed rotation time interval in the rotation period. Then the first acceleration interval can be the acceleration rotation time interval of the driving motor in the first rotation period when the clothing drying program is started, or the acceleration rotation time interval of the driving motor in the first n rotation periods when the clothing drying program is started. The first constant speed interval is the constant speed rotation time interval of the driving motor in the first rotation period when the clothing drying program is started, or the constant speed rotation time interval of the driving motor in the nth rotation period when the clothing drying program is started; where n is a positive integer.

[0066] In step S320, it should be noted that the first weight value of the clothing represents the load of the drum before the clothing is dried, and at the same time, it also represents the weight of the clothing before drying, that is, the sum of the actual weight of the clothing and the weight of the moisture contained in it.

[0067] In this embodiment, if the load of the drum is small, a relatively small current can increase the rotational speed of the driving motor from 0 rpm to a preset target rotational speed, or maintain the rotational speed of the driving motor at the preset target rotational speed. If the load of the drum is large, a relatively large current is required to increase the rotational speed of the driving motor to the same target rotational speed, or maintain the rotational speed of the driving motor at this target rotational speed. Therefore, the first acceleration current of the driving motor in the first acceleration interval and the first constant speed current in the first constant speed interval can accurately represent the load of the drum, that is, the weight of the clothing before drying, when the clothing drying program is started, so as to accurately obtain the first weight value of the clothing before drying by the first acceleration current and the first constant speed current.

[0068] Please refer to Figure 5 , Figure 5 which is a flowchart of steps for obtaining the first weight value of clothing according to the first acceleration current and the first constant speed current provided by an exemplary embodiment of the present application. The controller is further configured to execute the following steps S510 to step S530:

[0069] Step S510, obtain the first current difference between the first acceleration current and the first constant speed current.

[0070] Step S520, perform a lookup operation in a preset first database; where the preset first database stores the corresponding relationship between the reference weight value and the reference current difference.

[0071] Step S530, when the reference current difference identical to the first current difference is found, determine the reference weight value corresponding to the reference current difference as the first weight value.

[0072] The following will describe these three steps in detail respectively.

[0073] In step S510, the first current difference is the difference between the first acceleration current and the first constant-speed current, that is, in the case of starting the clothes drying program, the difference between the current when the driving motor is in the acceleration rotation time interval and the current when the driving motor is in the constant-speed rotation time interval.

[0074] In step S520, the reference weight value represents the drum load, that is, the weight value of the clothes in the drum; the reference current difference represents the difference between the current when the driving motor is in the acceleration rotation time interval and the current when the driving motor is in the constant-speed rotation time interval. Then the corresponding relationship between the reference weight value and the reference current difference represents the corresponding relationship between the weight value of the clothes in the drum and the difference between the current when the driving motor is in the acceleration rotation time interval and the current when the driving motor is in the constant-speed rotation time interval.

[0075] In step S530, when finding the reference current difference that is the same as the first current difference, the reference weight value corresponding to the reference current difference that is the same as the first current difference is determined as the first weight value.

[0076] As can be seen from the above, by finding the reference current difference that is the same as the first current difference between the first acceleration current and the first constant-speed current in the preset first database, so as to determine the reference weight value corresponding to the reference current difference as the first weight value, the accuracy of obtaining the first weight value is improved.

[0077] In addition, the first current difference between the first acceleration current and the first constant-speed current may be small, or the reference current difference that is the same as the first current difference cannot be found in the preset first database, then the first weight value needs to be determined by the first current ratio between the first acceleration current and the first constant-speed current. In this way, the difference between the first acceleration current and the first constant-speed current can be amplified by the ratio, and the accuracy of obtaining the first weight value is improved.

[0078] Please refer to Figure 6 , Figure 6 which is a flowchart of steps for obtaining the first weight value of clothes according to the first acceleration current and the first constant-speed current provided by another exemplary embodiment of the present application. The controller is further configured to execute the following steps S610 to step S630:

[0079] Step S610, obtain the first current ratio between the first acceleration current and the first constant-speed current.

[0080] Step S620, perform a search operation in a preset second database using the first current ratio; wherein, the preset second database stores the correspondence between the reference weight value and the reference current ratio.

[0081] Step S630, when a reference current ratio identical to the first current ratio is found, determine the reference weight value corresponding to the reference current ratio as the first weight value.

[0082] The following describes these three steps in detail respectively.

[0083] In step S610, the first current ratio is the ratio between the first accelerating current and the first constant-speed current, that is, when starting the clothing drying program, it is the ratio between the current when the driving motor is in the accelerating rotation time interval and the current when the driving motor is in the constant-speed rotation time interval.

[0084] In step S620, the reference weight value represents the drum load, that is, the weight value of the clothes in the drum; the reference current ratio represents the ratio between the current when the driving motor is in the accelerating rotation time interval and the current when the driving motor is in the constant-speed rotation time interval. Then the correspondence between the reference weight value and the reference current ratio represents the correspondence between the weight value of the clothes in the drum and the ratio between the current when the driving motor is in the accelerating rotation time interval and the current when the driving motor is in the constant-speed rotation time interval.

[0085] In step S630, when a reference current ratio identical to the first current ratio is found, determine the reference weight value corresponding to the reference current ratio identical to the first current ratio as the first weight value.

[0086] As can be seen from the above, by finding a reference current ratio identical to the first current difference in the preset first database according to the first current ratio between the first accelerating current and the first constant-speed current, so as to determine the reference weight value corresponding to the reference current ratio as the first weight value, thereby improving the accuracy of obtaining the first weight value.

[0087] In step S220, the preset duration is the interval duration during which the humidity value of the clothes in the drum changes significantly, that is, the duration during which the change amount of the humidity value of the clothes in the drum is greater than the preset humidity difference. Here, the change amount is relative to the first humidity value obtained when starting the clothing drying program. The preset duration is obtained through the first weight value. For example: perform a look-up operation in the preset fifth database using the first weight value to obtain the preset duration corresponding to the first weight value. Among them, the preset fifth database stores the correspondence between the first weight value and the preset duration. This correspondence is obtained through multiple experimental tests in the laboratory.

[0088] Further, the controller is further configured to, when the drying reaches a preset duration, obtain a second humidity value of the clothes based on the humidity detected by the humidity sensor. Since the drying program of the clothes has run for the preset duration at this time and part of the moisture contained in the clothes has evaporated, the humidity value of the clothes in the drum has changed significantly. This second humidity value is the humidity value of the clothes when the drying reaches the preset duration.

[0089] In an alternative embodiment, a humidity sensor is provided in the drum. When the drying reaches the preset duration, the controller determines the humidity value detected by the humidity sensor as the second humidity value of the clothes.

[0090] In another alternative embodiment, a plurality of humidity sensors are provided in the drum, and each humidity sensor is respectively arranged in different areas of the drum. When the drying reaches the preset duration, the controller determines the average value of the humidity values detected by the humidity sensors as the second humidity value of the clothes. In this way, compared with only providing two humidity sensors in the drum, the average value of the humidity values detected by the plurality of humidity sensors can better represent the overall humidity situation of the clothes in the drum.

[0091] Further, the controller is further configured to perform the following steps: when the drying reaches the preset duration, obtain a second acceleration current of the driving motor in the second acceleration interval and a second uniform speed current of the driving motor in the second uniform speed interval; wherein, the second acceleration interval is the time interval during which the driving motor accelerates and rotates when the drying reaches the preset duration; the second uniform speed interval is the time interval during which the driving motor rotates at a uniform speed when the drying reaches the preset duration; obtain a second weight value of the clothes based on the second acceleration current and the second uniform speed current. In this way, the second acceleration current of the driving motor in the second acceleration interval and the second uniform speed current of the driving motor in the second uniform speed interval can accurately represent the load of the drum, that is, the weight of the clothes before drying, when the drying reaches the preset duration, so as to obtain the second weight value of the clothes when the drying reaches the preset duration based on the second acceleration current and the second uniform speed current.

[0092] In this embodiment, the second acceleration interval can be the acceleration rotation time interval of the driving motor in the first rotation cycle when the drying reaches the preset duration, or can be the acceleration rotation time interval of the driving motor in the first n rotation cycles when the drying reaches the preset duration. The second uniform speed interval is the uniform speed rotation time interval of the driving motor in the first rotation cycle when the drying reaches the preset duration, or can be the uniform speed rotation time interval of the driving motor in the nth rotation cycle when the drying reaches the preset duration; wherein, the rotation cycle starts counting from 0 at the moment when the drying reaches the preset duration; n is a positive integer.

[0093] The second weight value of the clothing characterizes the load of the drum when the clothing is dried for a preset duration. At the same time, it also characterizes the weight of the clothing when it is dried for the preset duration, that is, when the clothing is dried for the preset duration, it is the sum of its actual weight and the weight of the moisture it contains.

[0094] Further, the controller is further configured to perform the following steps: obtain a second current difference between the second acceleration current and the first constant-speed current; perform a lookup operation in a preset first database using the second current difference; when a reference current difference identical to the second current difference is found, determine the reference weight value corresponding to the reference current difference as the second weight value. Or, obtain a second current ratio between the second acceleration current and the second constant-speed current; perform a lookup operation in a preset second database using the second current ratio; when a reference current ratio identical to the second current ratio is found, determine the reference weight value corresponding to the reference current ratio as the second weight value.

[0095] Further, in step S230, the controller is further configured to perform the following steps: obtain a humidity difference between the first humidity value and the second humidity value; obtain a weight difference between the first weight value and the second weight value; perform a lookup operation in a preset third database using the humidity difference and the weight difference to obtain the moisture content rate corresponding to both the humidity difference and the weight difference; the preset third database stores the corresponding relationship among the humidity difference, the weight difference, and the moisture content rate. In this way, the moisture content rate can be found in the preset third database according to the humidity difference and the weight difference before and after the preset duration of drying the clothing, so as to be able to characterize the humidity content situation of the whole clothing, and facilitate the accurate control of the remaining drying duration according to the moisture content rate and the second weight value.

[0096] Optionally, in step S240, the controller is further configured to perform the following steps: perform a lookup operation in a preset fourth database using the second weight value and the moisture content rate to obtain the remaining drying duration corresponding to both the second weight value and the moisture content rate; the preset fourth database stores the corresponding relationship among the second weight value, the moisture content rate, and the remaining drying duration. In this way, the remaining drying duration is found in the preset fourth database through the second weight value and the moisture content rate, improving the accuracy of obtaining the remaining drying duration.

[0097] The remaining drying duration is the difference between the total duration required to dry the clothing and the preset duration.

[0098] Optionally, in step S240, the controller is further configured to perform the following steps: obtain the clothing material of the clothes in the drum; determine the remaining drying duration according to the clothing material, the second weight value, and the moisture content. In this way, the remaining drying duration can be determined by combining the clothing material, the second weight value, and the moisture content of the clothes, so that clothes of different materials are not easily damaged due to too long or too short drying duration, improving the user experience.

[0099] In an embodiment of the present application, when the user presses the button representing the start of drying on the control panel, the user also presses the button representing the clothing material. In response to this button, the controller determines the clothing material of the clothes in the drum; wherein, the clothing materials include silk, cotton, linen, wool, nylon, etc. Then, a lookup operation is performed in a preset sixth database using the clothing material, the second weight value, and the moisture content to obtain the remaining drying duration corresponding to the clothing material, the second weight value, and the moisture content; the preset sixth database stores the corresponding relationship among the clothing material, the second weight value, the moisture content, and the remaining drying duration.

[0100] Further, the controller is further configured to perform the following steps: when the remaining drying duration is greater than a preset reference duration, adjust the parameters of the heat pump system; re-determine the remaining drying duration according to the adjusted parameters of the heat pump system. In this way, when the remaining drying duration is too long, the remaining drying duration can be reduced by adjusting the parameters of the heat pump system, so that while reducing the drying duration, the drying effect is ensured.

[0101] In an embodiment of the present application, the controller obtains the seventh database corresponding to the second weight value and the moisture content; when the seventh database stores the second weight value and the moisture content, the corresponding relationship between the parameters of the heat pump system and the remaining drying duration; then, a lookup operation is performed in the seventh database using the adjusted parameters of the heat pump system to obtain the remaining drying duration corresponding to the adjusted parameters of the heat pump system under the second weight value and the moisture content.

[0102] Further, the controller is further configured to perform the following steps: determine the parameter adjustment value according to the remaining drying duration; adjust the parameters of the heat pump system according to the parameter adjustment value. In this way, different parameter adjustment values can be determined for different remaining drying durations, so as to facilitate the adjustment of the parameters of the heat pump system.

[0103] The parameters of the heat pump system include the wind speed gear of the fan and the frequency gear of the compressor. The wind speed of the fan is divided into multiple wind speed gears. By determining the wind speed gear of the fan, the wind speed of the fan can be determined, so as to facilitate the adjustment of the fan wind speed. The compressor frequency of the compressor is divided into multiple frequency gears. By determining the frequency gear of the compressor, the compressor frequency of the compressor can be determined, so as to facilitate the adjustment of the compressor frequency.

[0104] The parameter adjustment values include the fan adjustment gear and the compressor adjustment gear. Among them, the fan adjustment gear is the number of gear positions that the fan needs to be adjusted, and the compressor adjustment gear is the number of gear positions that the compressor needs to be adjusted.

[0105] In an alternative embodiment of the present application, when the remaining drying duration is greater than a preset first drying duration, the fan adjustment gear is the 1st gear and the compressor adjustment gear is the 1st gear, that is, the wind speed gear of the fan is increased by 1 gear, and the compressor frequency gear of the compressor is increased by 1 gear; the preset first drying duration is 1 hour.

[0106] In another alternative embodiment of the present application, when the remaining drying duration is greater than a preset second drying duration, the fan adjustment gear is the 3rd gear and the compressor adjustment gear is the 3rd gear, that is, the wind speed gear of the fan is increased by 3 gears, and the compressor frequency gear of the compressor is increased by 3 gears; the preset first drying duration is 2 hours.

[0107] In yet another alternative embodiment of the present application, when the remaining drying duration is greater than a preset third drying duration, the fan adjustment gear is the difference between the preset highest wind speed gear and the current wind speed gear of the fan, and the compressor adjustment gear is the difference between the preset highest frequency gear and the current frequency gear of the compressor, that is, the wind speed gear of the fan is the preset highest wind speed gear, and the compressor frequency gear of the compressor is the preset highest frequency gear; the preset first drying duration is 3 hours.

[0108] Furthermore, the controller is also configured to display the remaining drying duration on the display screen.

[0109] During the drying process of the dryer, it can obtain the third humidity value and the third weight value of the clothes at preset time intervals. Based on the third humidity value, the third weight value, the previously obtained third humidity value, and the previously obtained third weight value, it recalculates the remaining drying time. When the recalculated remaining drying time is greater than the remaining drying time shown on the display screen, it increases the parameters of the heat pump system and slows down the reduction rate of the remaining drying time shown on the display screen. For example, when the actual time interval is 2 minutes, the remaining drying time shown on the display screen decreases by 1 minute, so that when the drying is completed, the remaining drying time shown on the display screen is exactly 0. The reduction rate of the remaining drying time shown on the display screen can be determined based on the remaining drying time shown on the display screen, the recalculated remaining drying time, and the parameters of the adjusted heat pump system. When the recalculated remaining drying time is less than the remaining drying time shown on the display screen, it speeds up the reduction rate of the remaining drying time shown on the display screen. For example, when the actual time interval is 2 minutes, the remaining drying time shown on the display screen decreases by 2.5 minutes, so that when the drying is completed, the remaining drying time shown on the display screen is exactly 0. The reduction rate of the remaining drying time shown on the display screen can be determined based on the remaining drying time shown on the display screen, the recalculated remaining drying time, and the parameters of the adjusted heat pump system. In this way, the time when the display screen stops counting is the same as the end time of the clothes drying program, which facilitates the dryer to alarm or remind the user in time when the drying is completed, improving the user experience.

[0110] In step S250, when the parameters of the heat pump system are not adjusted, the remaining drying time is the remaining drying time found in the second database or the sixth database. When the parameters of the heat pump system are adjusted, the remaining drying time is the remaining drying time recalculated based on the adjusted parameters of the heat pump system.

[0111] It can be seen that this application determines the moisture content of the clothes based on the first humidity value and the first weight value of the clothes in the drum when starting the clothes drying program and the second humidity value and the second weight value of the clothes when drying to the preset time. It can determine the moisture content based on the change in humidity and weight during the preset drying time of the clothes, so that the moisture content can reflect the overall humidity of the clothes. Compared with directly controlling the drying time based on the humidity value detected by the humidity sensor, it accurately determines the remaining drying time based on the moisture content and the second weight value of the clothes, and then when drying to the remaining drying time, it controls the end of the clothes drying program, achieving precise control of the clothes drying time, thereby improving the drying effect.

[0112] It should be noted that the first database, the second database, the third database, the fourth database, the fifth database, the sixth database and the seventh database of the present application are all obtained through multiple measurements in the laboratory.

[0113] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include well-known common general knowledge or conventional technical means in the technical field not disclosed in the present application.

[0114] It should be understood that the above content is only a preferred exemplary embodiment of the present application and is not used to limit the implementation of the present application. Those of ordinary skill in the art can easily make corresponding adaptations or modifications according to the main concept and spirit of the present application. Therefore, the protection scope of the present application should be subject to the protection scope required by the claims.

Claims

1. A dryer, characterized in that, Comprising: A box body; A drum and a heat pump system disposed within the box body, the heat pump system being configured to convey heated air into the drum; A driving motor for providing rotational power to the drum; A humidity sensor for detecting the humidity of the clothes within the drum; A controller electrically connected to the driving motor, the heat pump system, and the humidity sensor, the controller being configured to perform the following steps: In response to a preset clothes drying instruction, start a clothes drying program and obtain a first humidity value of the clothes within the drum and a first weight value of the clothes; When drying reaches a preset duration, obtain a second humidity value of the clothes and a second weight value of the clothes; Determine the moisture content of the clothes based on the first humidity value, the second humidity value, the first weight value, and the second weight value; Determine the remaining drying duration based on the second weight value and the moisture content; When drying reaches the remaining drying duration, control to end the clothes drying program.

2. The dryer according to claim 1, characterized in that, The controller is further configured to: When starting the clothes drying program, obtain a first acceleration current of the driving motor in a first acceleration interval and a first constant speed current in a first constant speed interval; the first acceleration interval is the time interval during which the driving motor accelerates and rotates when starting the clothes drying program; the first constant speed interval is the time interval during which the driving motor rotates at a constant speed when starting the clothes drying program; Obtain the first weight value of the clothes based on the first acceleration current and the first constant speed current.

3. The dryer according to claim 2, characterized in that, The controller is further configured to: Obtain a first current difference between the first acceleration current and the first constant speed current; Perform a lookup operation in a preset first database; the preset first database stores the correspondence relationship between reference weight values and reference current differences; When finding a reference current difference identical to the first current difference, determine the reference weight value corresponding to the reference current difference as the first weight value.

4. The dryer according to claim 2, characterized in that, The controller is further configured to: Obtain a first current ratio between the first acceleration current and the first constant speed current; Perform a lookup operation in a preset second database; the preset second database stores the correspondence relationship between reference weight values and reference current ratios; When finding a reference current ratio identical to the first current ratio, determine the reference weight value corresponding to the reference current ratio as the first weight value.

5. The dryer according to claim 1, characterized in that, The controller is further configured to: When drying reaches a preset duration, obtain a second acceleration current of the driving motor in a second acceleration interval and a second constant speed current in a second constant speed interval; the second acceleration interval is the time interval during which the driving motor accelerates and rotates when drying reaches the preset duration; The second constant speed interval is the time interval during which the driving motor rotates at a constant speed when drying reaches the preset duration; Obtain the second weight value of the clothes based on the second acceleration current and the second constant speed current.

6. The dryer according to claim 1, characterized in that, The controller is further configured to: Obtain a humidity difference between the first humidity value and the second humidity value; Obtain the weight difference between the first weight value and the second weight value; Perform a lookup operation in a preset third database using the humidity difference and the weight difference to obtain the moisture content corresponding to both the humidity difference and the weight difference; The preset third database stores the corresponding relationship among the humidity difference, the weight difference, and the moisture content.

7. The dryer according to claim 1, characterized in that, The controller is further configured to: Perform a lookup operation in a preset fourth database using the second weight value and the moisture content to obtain the remaining drying duration corresponding to both the second weight value and the moisture content; the preset fourth database stores the corresponding relationship among the second weight value, the moisture content, and the remaining drying duration.

8. The dryer according to claim 1, wherein, The controller is further configured to: Obtain the clothing material of the clothes in the drum; Determine the remaining drying duration according to the clothing material, the second weight value, and the moisture content.

9. The dryer according to any one of claims 1 to 8, wherein, The controller is further configured to: Adjust the parameters of the heat pump system when the remaining drying duration is greater than a preset reference duration; Re-determine the remaining drying duration according to the adjusted parameters of the heat pump system.

10. The dryer according to claim 1, wherein, The controller is further configured to: Determine a parameter adjustment value according to the remaining drying duration; Adjust the parameters of the heat pump system according to the parameter adjustment value.

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