Dryer

Abstract

Embodiments of the present application provide a dryer, comprising: a cabinet; a drum and a heat pump system for conveying heated air into the drum, which are arranged in the cabinet; a driving motor for providing rotating power to the drum; a humidity sensor for detecting humidity of clothes in the drum; a controller electrically connected with the driving motor, the heat pump system and the humidity sensor, the controller is configured to perform the following steps: in response to a preset clothes drying instruction, starting a clothes drying program, and obtaining a first humidity value of the clothes and a first weight value of the clothes; when drying to a preset time length, obtaining a second humidity value of the clothes and a second weight value of the clothes; determining a water content of the clothes according to the first humidity value, the second humidity value, the first weight value and the second weight value; determining a remaining drying time length according to the second weight value and the water content; and ending the clothes drying program when drying to the remaining drying time length. The present application can accurately control the drying time length to improve the drying effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drying machines, in particular to a drying machine. BACKGROUND

[0002] A drying machine is a household appliance used to dry wet clothes. The drying machine heats fresh cold air into dry hot air through a heat pump device, and then utilizes 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 sufficient heat exchange between the dry hot air and the clothes, thereby realizing the drying of the clothes. However, the drying degree of the clothes is closely related to the drying time. 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 will not be completely dried and still have moisture inside. Therefore, in order to ensure the drying effect of the drying machine, the drying machine needs to control the drying time.

[0003] At present, the way to determine the drying time is to set a humidity sensor inside the drum, detect the humidity value of the clothes by using the humidity sensor, and determine whether the clothes are dry according to the humidity value to determine whether to stop drying, thereby realizing the control of the drying time. However, the humidity value detected by the humidity sensor can only represent the humidity value of the local clothes it touches and cannot represent the humidity of all the clothes. Therefore, controlling the drying time according to the humidity value detected by the humidity sensor still cannot guarantee the drying effect of the clothes.

[0004] Therefore, there is an urgent need for a drying machine that can accurately control the drying time to improve the drying effect. SUMMARY

[0005] To solve the above technical problems, the embodiments of the present application provide a drying machine.

[0006] According to one aspect of the embodiments of the present application, the embodiments of the present application provide a drying machine, comprising: a cabinet; a drum and a heat pump system arranged in the cabinet, the heat pump system being configured to deliver heated air into the drum; a driving motor configured to provide rotating power to the drum; a humidity sensor configured to detect the humidity of clothes in the drum; and 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, starting a clothes drying program and obtaining a first humidity value of clothes in the drum and a first weight value of the clothes; obtaining a second humidity value of the clothes and a second weight value of the clothes when drying to a preset time; determining the water content of the clothes according to the first humidity value, the second humidity value, the first weight value and the second weight value; determining the remaining drying time according to the second weight value and the water content; and controlling the clothes drying program to end when the clothes are dried for the remaining drying time.

[0007] In the above embodiment, the moisture content of the clothes is determined according to the first humidity value of the clothes in the drum when the clothes drying program is started and the first weight value of the clothes, and the second humidity value of the clothes when the clothes are dried to the preset time length and the second weight value of the clothes, so that the moisture content can reflect the humidity condition of the clothes as a whole, and compared with directly controlling the drying time according to the humidity value detected by the humidity sensor, the remaining drying time is accurately determined according to the moisture content and the second weight value of the clothes, and then the clothes drying program is ended when the clothes are dried to the remaining drying time, so that the drying time is accurately controlled, and the drying effect is improved.

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

[0009] In the above embodiment, the first acceleration current of the driving motor in the first acceleration interval and the first uniform speed current in the first uniform speed interval can accurately represent the weight of the clothes before drying when the clothes drying program is started, so as to obtain the first weight value of the clothes before drying by the first acceleration current and the first uniform speed current.

[0010] In an embodiment of the present application, based on the foregoing scheme, the controller is further configured to perform the following steps: obtaining a first current difference between the first acceleration current and the first uniform speed current; performing a lookup operation in a preset first database by using the first current difference; the preset first database stores a corresponding relationship between a reference weight value and a reference current difference; and in a case where a reference current difference identical to the first current difference is found, determining the reference weight value corresponding to the reference current difference as the first weight value.

[0011] In the above embodiment, the reference current difference corresponding to the first current difference is determined as the first weight value by finding the reference current difference identical to the first current difference in the preset first database according to the first current difference between the first acceleration current and the first uniform speed current, so as to improve the accuracy of obtaining the first weight value.

[0012] In an embodiment of the present application, based on the foregoing scheme, the controller is further configured to perform the following steps: obtaining a first current ratio between the first acceleration current and the first uniform speed current; performing a lookup operation in a preset second database by using the first current ratio; the preset second database stores a corresponding relationship between a reference weight value and a reference current ratio; in the case of finding the same reference current ratio as the first current ratio, determining the reference weight value corresponding to the reference current ratio as the first weight value.

[0013] In the above embodiment, by finding the same reference current ratio as the first current difference in the preset first database according to the first current ratio between the first acceleration current and the first uniform speed current, the reference weight value corresponding to the reference current ratio is determined 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 scheme, the controller is further configured to perform the following steps: obtaining a first current ratio between the first acceleration current and the first uniform speed current; performing a lookup operation in a preset second database by using the first current ratio; the preset second database stores a corresponding relationship between a reference weight value and a reference current ratio; in the case of finding the same reference current ratio as the first current ratio, determining the reference weight value corresponding to the reference current ratio as the first weight value.

[0015] In the above embodiment, by finding the same reference current ratio as the first current difference in the preset first database according to the first current ratio between the first acceleration current and the first uniform speed current, the reference weight value corresponding to the reference current ratio is determined as the first weight value, thereby improving the accuracy of obtaining the first weight value.

[0016] In an embodiment of the present application, based on the foregoing scheme, the controller is further configured to perform the following steps: obtaining a first current ratio between the first acceleration current and the first uniform speed current; performing a lookup operation in a preset second database by using the first current ratio; the preset second database stores a corresponding relationship between a reference weight value and a reference current ratio; in the case of finding the same reference current ratio as the first current ratio, determining the reference weight value corresponding to the reference current ratio as the first weight value.

[0017] In the above embodiment, the moisture content can be obtained according to the humidity difference and the weight difference before and after the preset drying time of the clothes, so as to represent the moisture content of the clothes, and the remaining drying time can be accurately controlled according to the moisture content and the second weight value.

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

[0019] In the above embodiment, the remaining drying time is obtained by using the second weight value and the moisture content in the preset fourth database, thereby improving the accuracy of obtaining the remaining drying time.

[0020] In an embodiment of the present application, based on the foregoing scheme, the controller is further configured to perform the following steps: obtaining a material of the clothes in the drum; and determining the remaining drying time according to the material of the clothes, the second weight value, and the moisture content.

[0021] In the above embodiment, the remaining drying time can be determined according to the material of the clothes, the second weight value, and the moisture content, so that clothes of different materials are less likely to be damaged due to too long or too short drying time, thereby improving the user experience.

[0022] In an embodiment of the present application, based on the foregoing scheme, the controller is further configured to perform the following steps: adjusting the parameters of the heat pump system when the remaining drying time is greater than a preset reference time; and determining the remaining drying time again according to the adjusted parameters of the heat pump system.

[0023] In the above embodiment, when the remaining drying time is too long, the remaining drying time can be reduced by adjusting the parameters of the heat pump system, so as to reduce the drying time while ensuring the drying effect.

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

[0025] In the above embodiment, different parameter adjustment values can be determined for different remaining drying times, so as to adjust the parameters of the heat pump system.

[0026] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application, as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and serve to explain the principles of the application. It is readily apparent to one skilled in the art that the following description of the drawings is merely exemplary and that other drawings can be derived from these drawings without departing from the scope of the application. In the drawings:

[0028] Figure 1 is a structural diagram of a dryer according to an exemplary embodiment of the present application;

[0029] Figure 2 is a flowchart of steps executable by a controller in a dryer according to an exemplary embodiment of the present application;

[0030] Figure 3 is a flowchart of steps for obtaining a first weight value according to an exemplary embodiment of the present application;

[0031] Figure 4 is a diagram of one rotation cycle of a motor according to an exemplary embodiment of the present application;

[0032] Figure 5 is a flowchart of steps for obtaining a first weight value of laundry according to a first acceleration current and a first constant speed current according to an exemplary embodiment of the present application;

[0033] Figure 6 is a flowchart of steps for obtaining a first weight value of laundry according to a first acceleration current and a first constant speed current according to another exemplary embodiment of the present application. DETAILED DESCRIPTION

[0034] The exemplary embodiments will now be described in detail with reference to the accompanying drawings. The following description is merely exemplary and explanatory in nature and is not intended to limit the application, as claimed. Rather, it is submitted solely for better understanding of the application according to some aspects thereof, as detailed in the appended claims.

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

[0036] The flowcharts shown in the drawings are only illustrative, and do not necessarily include all the contents and operations / steps, nor are they necessarily executed in the order described. For example, some operations / steps can be further broken down, and some operations / steps can be combined or partially combined, so the actual execution order can be changed according to actual conditions.

[0037] It should also be noted that "multiple" as mentioned in the present application refers to two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0038] The terms "first", "second", "third", and "fourth" and the like in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not used to describe a particular order. The terms "include" and "have" 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 can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product, or device.

[0039] The current way to determine the drying time 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 dry according to the humidity value, to determine whether to stop drying, thereby realizing control of the drying time. However, the humidity value detected by the humidity sensor can only represent the humidity value of the local clothes it touches, and cannot represent the humidity of all the clothes. Therefore, controlling the drying time according to the humidity value detected by the humidity sensor cannot guarantee the drying effect of the clothes.

[0040] To solve the above technical problems, the present application provides a dryer capable of accurately controlling the drying time to improve the drying effect, Figure 1 is a structural schematic diagram of a dryer provided by an exemplary embodiment of the present application. As shown in Figure 1 The dryer 10 includes a cabinet 11, a drum 12, a heat pump system 13, a driving 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 an external structure of the dryer 10, used for fixing and protecting the internal components. The cabinet 11 is usually made of metal or plastic; a door is usually arranged on the cabinet 11, used for putting or taking out the clothes from the drum 12, and the door is usually equipped with a sealing ring to prevent water leakage; a display screen and a control panel are usually arranged on the cabinet 11, and the control panel is provided with buttons, knobs or a touch screen.

[0042] The drum 12 is arranged inside the cabinet 11, usually made of stainless steel, used for accommodating and drying the clothes, and the clothes are uniformly heated by rotating to facilitate the removal of water in the clothes.

[0043] The heat pump system 13 is arranged inside the cabinet 11, used for providing dry hot air into the drum. The heat pump system 13 includes a fan, a condenser, an evaporator and a compressor. The fan is used to suck in fresh cold air from the outside and deliver 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 driving motor 14 is the power source of the dryer 10, responsible for rotating the drum 12 by rotating drive to drive the clothes in the drum to turn over; in this way, the dry hot air can fully mix and contact with the turning clothes, improving the drying effect.

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

[0046] The controller 16 is electrically connected with the driving motor, the heat pump system and the humidity sensor respectively, please refer to Figure 2 , Figure 2 The step flow chart of the steps executable by the controller in the dryer provided by the exemplary embodiment of the present application is shown in the following steps S210 to S250:

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

[0048] Step S220, obtaining a second humidity value of the clothes and a second weight value of the clothes when drying to a preset time length.

[0049] Step S230, determining the water content rate of the clothes according to the first humidity value of the clothes, the second humidity value of the clothes, the first weight value of the clothes and the second weight value of the clothes.

[0050] Step S240, determining the remaining drying time length according to the second weight value of the clothes and the water content of the clothes.

[0051] Step S250, when drying to the remaining drying time length, controlling to end the clothes drying program.

[0052] The following will be described in detail respectively.

[0053] In step S210, the preset clothes drying instruction is that the user presses the button representing the start of drying on the control panel of the cabinet after putting the clothes into the drum, that is, the preset clothes drying instruction is issued to the dryer, and the dryer starts the clothes drying program corresponding to the clothes drying instruction, and obtains the first humidity value of the clothes in the drum and the first weight value of the clothes.

[0054] The first humidity value of the clothes is obtained by the humidity sensor detecting the humidity when the dryer starts the clothes drying program. At this time, the drying of the clothes has just begun, and the moisture in the clothes has not yet begun to evaporate, so the first humidity value is actually the humidity value of the clothes before drying.

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

[0056] In an optional embodiment, one humidity sensor is arranged in the drum, and the controller determines the humidity value detected by the humidity sensor as the first humidity value of the clothes when the clothes drying program is started.

[0057] In another optional embodiment, a plurality of humidity sensors are arranged in the drum, and each humidity sensor is arranged in a different area of the drum. When the clothes 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 clothes. In this way, compared with arranging only one humidity sensor in the drum, the average value of the humidity values detected by the plurality of humidity sensors can better represent the humidity condition of the clothes in the drum as a whole.

[0058] The first weight value of the clothes is the weight of the clothes when the dryer starts the clothes drying program. At this time, the drying of the clothes has just begun, and the moisture in the clothes has not yet begun to evaporate, so the first humidity value is actually the weight value of the clothes before drying, that is, the sum of the actual weight value of the clothes and the instruction value of the water in the clothes.

[0059] Please refer to Figure 3 , Figure 3 The first weight value of the clothes is the weight of the clothes when the dryer starts the clothes drying program. At this time, the drying of the clothes has just begun, and the moisture in the clothes has not yet begun to evaporate, so the first humidity value is actually the weight value of the clothes before drying, that is, the sum of the actual weight value of the clothes and the instruction value of the water in the clothes.

[0060] At step 310, in the case of starting the clothes drying program, the first acceleration current of the driving motor in the first acceleration interval and the first uniform speed current in the first uniform speed interval are obtained; wherein the first acceleration interval is the time interval in which the driving motor accelerates rotation in the case of starting the clothes drying program; the first uniform speed interval is the time interval in which the driving motor rotates at a uniform speed in the case of starting the clothes drying program.

[0061] At step 320, the first weight value of the clothes is obtained according to the first acceleration current and the first uniform speed current.

[0062] The two steps will be described in detail below.

[0063] In step S310, it should be noted that the rotation of the driving motor is periodic during the drying process. The rotation cycle of the driving motor includes a stop rotation time interval, an acceleration rotation time interval, a uniform rotation time interval and a deceleration rotation time interval. Among them, the stop rotation time interval is the time interval in which the driving motor has a rotation speed of 0 rpm; the acceleration rotation time interval is the time interval in which the driving motor gradually increases the rotation speed from 0 rpm to a preset target rotation speed; the uniform rotation time interval is the time interval in which the driving motor maintains the rotation speed at the preset target rotation speed; the deceleration rotation time interval is the time interval in which the driving motor reduces the rotation speed from the preset target rotation speed to 0 rpm. The preset target rotation speed is between 40 rpm and 60 rpm.

[0064] Figure 4 As shown, Figure 4 is a schematic diagram of one rotation cycle of the driving motor. The preset target rotation speed is 45 rpm. The rotation cycle of the driving motor starts at t0, between t0 and t1, the rotation speed of the driving motor is 0 rpm, so the time interval between t0 and t1 is the stop rotation time interval; between t1 and t2, the rotation speed of the driving motor increases uniformly from 0 rpm to the preset target rotation speed 45 rpm, so the time interval between t1 and t2 is the acceleration rotation time interval; between t2 and t3, the driving motor rotates at a uniform speed of 45 rpm, so the time interval between t2 and t3 is the uniform rotation time interval; between t3 and t4, the rotation speed of the driving motor decreases uniformly from 45 rpm to 0 rpm, so the time interval between t3 and t4 is the deceleration rotation time interval.

[0065] In an embodiment of the present application, the time interval in which the driving motor accelerates rotation is an acceleration rotation time interval in a rotation period; and the time interval in which the driving motor rotates at a constant speed is a constant speed rotation time interval in the rotation period. The first acceleration interval can be an acceleration rotation time interval of the driving motor in a first rotation period when the clothes drying program is started, or can be an acceleration rotation time interval of the driving motor in the first n rotation periods when the clothes drying program is started. The first constant speed interval is a constant speed rotation time interval of the driving motor in the first rotation period when the clothes drying program is started, or can be a constant speed rotation time interval of the driving motor in the nth rotation period when the clothes drying program is started; wherein n is a positive integer.

[0066] In step S320, it should be noted that the first weight value of the clothes represents the load of the drum before the clothes are dried, and also represents the weight of the clothes before drying, i.e., the sum of the actual weight of the clothes and the weight of the moisture combined with the clothes.

[0067] In the embodiment, if the load of the drum is less, less current is required to increase the rotational speed of the driving motor from 0 rpm to a preset target rotational speed, or to maintain the rotational speed of the driving motor at the preset target rotational speed. If the load of the drum is more, more current is required to increase the rotational speed of the driving motor to the same target rotational speed, or to maintain the rotational speed of the driving motor at the target rotational speed. Therefore, the first acceleration current 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, i.e., the weight of the clothes before drying, when the clothes drying program is started, so that the first acceleration current and the first constant speed current accurately obtain the first weight value of the clothes before drying.

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

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

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

[0071] Step S530, in the case where the same reference current difference value as the first current difference value is found, determining the reference weight value corresponding to the reference current difference value as the first weight value.

[0072] The three steps are described in detail as follows.

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

[0074] In step S520, the reference weight value represents the load of the drum, that is, the weight value of the clothes in the drum; and 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 uniform speed rotation time interval. 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 uniform speed rotation time interval.

[0075] In step S530, in the case of finding the reference current difference identical to the first current difference, the reference weight value corresponding to the reference current difference identical to the first current difference is determined as the first weight value.

[0076] As can be seen from the above, the reference current difference identical to the first current difference is found in the preset first database according to the first current difference between the first acceleration current and the first uniform speed current, so as 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.

[0077] In addition, the first current difference between the first acceleration current and the first uniform speed current can be small, or the reference current difference identical to the first current difference cannot be found in the preset first database, and thus the first weight value needs to be determined by the first current ratio between the first acceleration current and the first uniform speed current. In this way, the difference between the first acceleration current and the first uniform speed current is amplified by the ratio, thereby improving the accuracy of obtaining the first weight value.

[0078] Please refer to Figure 6 , Figure 6 Another exemplary embodiment of the present application provides a step flow chart for obtaining the first weight value of the clothes according to the first acceleration current and the first uniform speed current, and the controller is further configured to perform the following steps S610 to S630:

[0079] In step S610, the first current ratio between the first acceleration current and the first uniform speed current is obtained.

[0080] In step S620, the first current ratio is used to search in a preset second database; wherein, the preset second database stores a corresponding relationship between a reference weight value and a reference current ratio.

[0081] In step S630, in the case that the same reference current ratio as the first current ratio is found, the reference weight value corresponding to the same reference current ratio as the first current ratio is determined as the first weight value.

[0082] The three steps are described in detail as follows.

[0083] In step S610, the first current ratio is the ratio between the first acceleration current and the first uniform speed current, that is, the ratio between the current when the driving motor is in the acceleration rotation time interval and the current when the driving motor is in the uniform speed rotation time interval in the case that the clothes drying program is started.

[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 acceleration rotation time interval and the current when the driving motor is in the uniform speed rotation time interval. The corresponding relationship between the reference weight value and the reference current ratio represents the corresponding relationship between the weight value of the clothes in the drum and the ratio between the current when the driving motor is in the acceleration rotation time interval and the current when the driving motor is in the uniform speed rotation time interval.

[0085] In step S630, in the case that the same reference current ratio as the first current ratio is found, the reference weight value corresponding to the same reference current ratio as the first current ratio is determined as the first weight value.

[0086] As can be seen from the above, the same reference current ratio as the first current difference is found in the preset first database according to the first current ratio between the first acceleration current and the first uniform 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 time length is the interval time length in which the humidity value of the clothes in the drum changes obviously, that is, the time length in 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 compared with the first humidity value obtained in the case that the clothes drying program is started. The preset time length is obtained by the first weight value. For example, the first weight value is used to search in a preset fifth database to obtain the preset time length corresponding to the first weight value. The preset fifth database stores a corresponding relationship between the first weight value and the preset time length. The corresponding relationship is obtained by multiple experimental tests in the laboratory.

[0088] Further, the controller is further configured to obtain a second humidity value of the laundry by the humidity detected by the humidity sensor when the drying is performed for the preset time length. Since the drying program of the laundry has been performed for the preset time length at this time, the moisture contained in the laundry has been evaporated partially, and thus the humidity value of the laundry in the drum changes significantly, and the second humidity value is the humidity value of the laundry when the drying is performed for the preset time length.

[0089] In an optional embodiment, a humidity sensor is arranged in the drum, and the controller determines the humidity value detected by the humidity sensor as the second humidity value of the laundry when the drying is performed for the preset time length.

[0090] In another optional embodiment, a plurality of humidity sensors are arranged in the drum, and each of the humidity sensors is arranged in a different area in the drum. The controller determines an average value of the humidity values detected by the humidity sensors as the second humidity value of the laundry when the drying is performed for the preset time length. In this way, compared with arranging only two humidity sensors in the drum, the average value of the humidity values detected by the plurality of humidity sensors can better represent the humidity condition of the laundry in the drum as a whole.

[0091] Further, the controller is further configured to perform the following steps: obtaining a second acceleration current of the driving motor in a second acceleration interval and a second uniform speed current of the driving motor in a second uniform speed interval when the drying is performed for the preset time length; the second acceleration interval is a time interval in which the driving motor accelerates rotation when the drying is performed for the preset time length; the second uniform speed interval is a time interval in which the driving motor rotates at a uniform speed when the drying is performed for the preset time length; and obtaining a second weight value of the laundry according to 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 weight of the laundry before the drying when the drying is performed for the preset time length, so as to obtain the second weight value of the laundry when the drying is performed for the preset time length according to the second acceleration current and the second uniform speed current.

[0092] In the embodiment, the second acceleration interval can be an acceleration rotation time interval of the driving motor in a first rotation period when the drying is performed for the preset time length, or can be an acceleration rotation time interval of the driving motor in the first n rotation periods when the drying is performed for the preset time length. The second uniform speed interval is a uniform speed rotation time interval of the driving motor in the first rotation period when the drying is performed for the preset time length, or can be a uniform speed rotation time interval of the driving motor in the nth rotation period when the drying is performed for the preset time length; wherein the rotation period is counted from 0 at the time when the drying is performed for the preset time length; and n is a positive integer.

[0093] The second weight value of the laundry represents the load of the drum when the laundry is dried for the preset time length, and also represents the weight of the laundry when the laundry is dried for the preset time length, i.e., the sum of the actual weight of the laundry and the weight of the moisture of the laundry when the laundry is dried for the preset time length.

[0094] Further, the controller is further configured to perform the following steps: obtaining a second current difference value between the second acceleration current and the first uniform speed current; performing a lookup operation on the preset first database by using the second current difference value; in the case that a reference current difference value identical to the second current difference value is found, determining a reference weight value corresponding to the reference current difference value as the second weight value. Or, obtaining a second current ratio value between the second acceleration current and the second uniform speed current; performing a lookup operation on the preset second database by using the second current ratio value; in the case that a reference current ratio value identical to the second current ratio value is found, determining a reference weight value corresponding to the reference current ratio value as the second weight value.

[0095] Further, in step S230, the controller is further configured to perform the following steps: obtaining a humidity difference value between the first humidity value and the second humidity value; obtaining a weight difference value between the first weight value and the second weight value; performing a lookup operation on a preset third database by using the humidity difference value and the weight difference value to obtain a moisture content corresponding to the humidity difference value and the weight difference value; the preset third database stores a corresponding relationship among the humidity difference value, the weight difference value and the moisture content. In this way, the moisture content of the laundry can be represented according to the humidity difference value and the weight difference value before and after the laundry is dried for the preset time length, so as to realize accurate control of the remaining drying time according to the moisture content and the second weight value.

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

[0097] The remaining drying time is a difference between a total time required for drying the laundry and the preset time length.

[0098] Optionally, in step S240, the controller is further configured to perform the following steps: obtaining a material of the laundry in the drum; determining the remaining drying time according to the material of the laundry, the second weight value and the moisture content. In this way, the remaining drying time can be determined in combination with the material of the laundry, the second weight value and the moisture content, so that laundry of different materials is less likely to be damaged due to an excessively long or short drying time, and the user experience is improved.

[0099] In an embodiment of the present application, the user presses the button representing the start of drying on the control panel, and also presses the button representing the material of the laundry. The controller determines the material of the laundry in the drum in response to the button, wherein the material of the laundry includes silk, cotton, linen, wool or nylon, etc. Then, the material of the laundry, the second weight value and the moisture content are used to perform a lookup operation in a preset sixth database to obtain the remaining drying time corresponding to the material of the laundry, the second weight value and the moisture content, wherein the preset sixth database stores the corresponding relationship between the material of the laundry, the second weight value, the moisture content and the remaining drying time.

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

[0101] In an embodiment of the present application, the controller obtains a seventh database corresponding to the second weight value and the moisture content, wherein the seventh database stores the corresponding relationship between the parameter of the heat pump system and the remaining drying time under the condition of the second weight value and the moisture content. Then, the adjusted parameter of the heat pump system is used to perform a lookup operation in the seventh database to obtain the remaining drying time corresponding to the adjusted parameter of the heat pump system under the condition of the second weight value and the moisture content.

[0102] Further, the controller is further configured to perform the following steps: determining a parameter adjustment value according to the remaining drying time; and adjusting the parameter 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 times, so as to facilitate the adjustment of the parameter of the heat pump system.

[0103] The parameter of the heat pump system includes a speed gear of the fan and a frequency gear of the compressor. The speed of the fan is divided into a plurality of speed gears, and the speed of the fan can be determined by determining the speed gear of the fan, so as to facilitate the adjustment of the speed of the fan. The frequency of the compressor is divided into a plurality of frequency gears, and the frequency of the compressor can be determined by determining the frequency gear of the compressor, so as to facilitate the adjustment of the frequency of the compressor.

[0104] The parameter adjustment value comprises a fan adjustment gear and a compressor adjustment gear, wherein the fan adjustment gear is a number of gears that the fan needs to adjust, and the compressor adjustment gear is a number of gears that the compressor needs to adjust.

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

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

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

[0108] Further, the controller is further configured to display the remaining drying time on the display screen.

[0109] In the process that the dryer performs the drying program, the third humidity value and the third weight value of the clothes can be obtained every preset time interval. The remaining drying time is reacquired according to the third humidity value, the third weight value, the third humidity value obtained last time and the third weight value obtained last time. In the case that the reacquired remaining drying time is greater than the remaining drying time displayed on the display screen, the parameter of the heat pump system is increased, and the decreasing rate of the remaining drying time displayed on the display screen is reduced, for example, in the case that the actual time interval is 2 minutes, the remaining drying time displayed on the display screen is reduced by 1 minute, so that the remaining drying time displayed on the display screen is just 0 when the drying is completed. The decreasing rate of the remaining drying time displayed on the display screen can be determined according to the remaining drying time displayed on the display screen, the reacquired remaining drying time and the adjusted parameter of the heat pump system. In the case that the reacquired remaining drying time is less than the remaining drying time displayed on the display screen, the decreasing rate of the remaining drying time displayed on the display screen is increased, for example, in the case that the actual time interval is 2 minutes, the remaining drying time displayed on the display screen is reduced by 2.5 minutes, so that the remaining drying time displayed on the display screen is just 0 when the drying is completed. The decreasing rate of the remaining drying time displayed on the display screen can be determined according to the remaining drying time displayed on the display screen, the reacquired remaining drying time and the adjusted parameter of the heat pump system. In this way, the time when the display screen stops running is the same as the time when the clothes drying program is completed, which facilitates the dryer to timely alarm or remind the user that the drying is completed, and improves the user experience.

[0110] In step S250, in the case that the parameter of the heat pump system is not adjusted, the remaining drying time is the remaining drying time found through the second database or the sixth database. In the case that the parameter of the heat pump system is adjusted, the remaining drying time is the remaining drying time re-determined according to the adjusted parameter of the heat pump system.

[0111] Therefore, the first humidity value and the first weight value of the clothes in the drum when the clothes drying program is started and the second humidity value and the second weight value of the clothes when the clothes are dried to the preset time are used to determine the moisture content of the clothes, the moisture content can be determined according to the humidity change and the weight change of the clothes when the clothes are dried to the preset time, so that the moisture content can reflect the humidity of the whole clothes, compared with directly controlling the drying time according to the humidity value detected by the humidity sensor, the remaining drying time is accurately determined according to the moisture content and the second weight value of the clothes, and then the clothes drying program is controlled to be completed when the clothes are dried to the remaining drying time, so that the drying time of the clothes is accurately controlled, and the drying effect is improved.

[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 obtained through multiple determinations in the laboratory.

[0113] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

[0114] It should be understood that the above description is only the preferred exemplary embodiment of the present application, and is not intended to limit the implementation of the present application. Those skilled in the art can easily make corresponding changes or modifications according to the main idea 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 by, The dryer comprises: a cabinet; a drum and a heat pump system arranged in the cabinet, the heat pump system being configured to deliver heated air into the drum; a driving motor configured to provide rotational power to the drum; a humidity sensor configured to detect humidity of clothes in 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, starting a clothes drying program and obtaining a first humidity value of the clothes in the drum and a first weight value of the clothes; when the clothes are dried for a preset time length, obtaining a second humidity value of the clothes and a second weight value of the clothes; determining a 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 a remaining drying time length according to the second weight value and the moisture content; controlling the clothes drying program to end when the clothes are dried for the remaining drying time length. The controller is further configured to: obtain a humidity difference value between the first humidity value and the second humidity value; obtain a weight difference value between the first weight value and the second weight value; perform a lookup operation in a preset third database using the humidity difference value and the weight difference value to obtain a moisture content corresponding to the humidity difference value and the weight difference value, the preset third database storing a corresponding relationship among the humidity difference value, the weight difference value and the moisture content; perform a lookup operation in a preset fourth database using the second weight value and the moisture content to obtain a remaining drying time length corresponding to the second weight value and the moisture content, the preset fourth database storing a corresponding relationship among the second weight value, the moisture content and the remaining drying time length.

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

3. The dryer according to claim 2, characterized in that, The controller is further configured to: obtain a first current difference value between the first acceleration current and the first uniform speed current; perform a lookup operation in a preset first database using the first current difference value; the preset first database stores a corresponding relationship between a reference weight value and a reference current difference value; when a reference current difference value identical to the first current difference value is found, determine the reference weight value corresponding to the reference current difference value 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 value between the first acceleration current and the first uniform speed current; perform a lookup operation in a preset second database using the first current ratio value; the preset second database stores a corresponding relationship between a reference weight value and a reference current ratio value. In a case where a reference current ratio identical to the first current ratio is found, a reference weight value corresponding to the reference current ratio is determined as the first weight value.

5. The dryer of claim 1, wherein, The controller is further configured to: In a case where the drying is performed for a preset time length, a second acceleration current of the driving motor in a second acceleration interval and a second uniform speed current of the driving motor in a second uniform speed interval are obtained; the second acceleration interval is a time interval during which the driving motor is accelerated to rotate in a case where the drying is performed for the preset time length; The second uniform speed interval is a time interval during which the driving motor rotates at a uniform speed in a case where the drying is performed for the preset time length; A second weight value of the clothes is obtained according to the second acceleration current and the second uniform speed current.

6. The dryer of claim 1, wherein, The controller is further configured to: Obtain a material of the clothes in the drum; Determine a remaining drying time length according to the material of the clothes, the second weight value and the water content.

7. The dryer according to any one of claims 1 to 6, characterized in that, The controller is further configured to: In a case where the remaining drying time length is greater than a preset reference time length, adjust a parameter of the heat pump system; Redetermine the remaining drying time length according to the adjusted parameter of the heat pump system.

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

Images