KR102479818B1 - Washing machine and control method thereof - Google Patents

Abstract

A washing machine and a control method thereof are disclosed. The washing machine according to the present invention includes a drum for accommodating laundry, an additive input unit for injecting additives for coating scent particles on laundry into the drum, a temperature control unit for controlling the internal temperature of the drum by generating hot and cold air, and a temperature inside the drum. The temperature control unit is controlled to be set to the first critical temperature, and when the temperature is set to the first critical temperature, the additive input unit is controlled so that the additive is put into the drum. When the additive is put into the drum, the temperature in the drum is set to the first critical temperature. and a control unit controlling the temperature controller to be set to a lower second threshold temperature. Accordingly, when washing laundry through the refresh process, the washing machine may provide the same effect as laundry washed in the general wash process.

Description

Washing machine and control method thereof {Washing machine and control method thereof}

The present invention relates to a washing machine and a control method thereof, and more particularly, to a washing machine sterilizing laundry through a refresh process and a control method thereof.

In general, a drum-type washing machine provides a washing cycle for washing laundry and a drying cycle for drying washed laundry.

In addition, recent drum-type washing machines provide a refresh operation function in addition to the above-described operation. The refresh cycle function is a function to wash laundry without water washing using detergent like in the washing cycle.

That is, the refresh operation function deodorizes the laundry by sterilizing and drying the laundry at a high temperature. By reducing the number of times of water washing of the laundry through such a refresh process, it is possible to prevent the laundry from being damaged.

However, the recently developed refresh operation function simply sterilizes and dries laundry. Therefore, even if laundry is washed through the refresh operation, there is a limit to providing the same effect as laundry washed by adding an additive such as a fabric softener through a general washing operation.

The present invention has been made in response to the above-described needs, and an object of the present invention is to provide the same effect as laundry washed in a general washing process when washing through a refresh process.

In order to achieve the above object, a washing machine according to an embodiment of the present invention generates a drum for accommodating laundry, an additive input unit for injecting an additive for coating fragrance particles on the laundry into the drum, and generating hot air and cold air. A temperature controller for adjusting the internal temperature of the drum and controlling the temperature controller to set the temperature in the drum to a first critical temperature, and when the temperature is set to the first critical temperature, the additive is introduced into the drum and a control unit controlling the temperature control unit so that the temperature in the drum is set to a second critical temperature lower than the first critical temperature when the additive is introduced into the drum.

The control unit may rotate the drum at a first critical speed while the internal temperature of the drum is set and maintained at the first critical temperature or the second critical temperature.

In addition, the control unit rotates the drum at a second critical speed faster than the first critical speed before the additive is introduced into the drum, and when the rotational speed of the drum reaches the second critical speed, The additive input unit may be controlled so that the additive is injected into the drum.

And, it further includes a sensing unit for sensing vibration, wherein the control unit, before the rotational speed of the drum reaches the second critical speed, if the vibration intensity sensed through the sensing unit is greater than or equal to a preset threshold level, the drum After the rotation of the end, the drum may be re-rotated at the second critical speed.

In addition, the control unit may control the additive injection unit so that the additive is not injected into the drum when the vibration intensity detected through the sensing unit is greater than or equal to the predetermined threshold intensity after the drum is re-rotated for a predetermined critical number of times. can

The control unit may control the additive input unit to inject the additive into the drum according to whether the rotational speed of the drum reaches the second critical speed within a predetermined critical time.

In addition, the control unit controls the temperature controller to maintain the first critical temperature for a first critical time period, and rotates the drum at a second critical speed faster than the first critical speed after the first critical time period. can

The control unit may control the temperature control unit to maintain the second critical temperature for a second critical time less than the first critical time when all of the additives are injected into the drum.

In addition, after the second threshold time, the control unit controls the temperature controller to set the internal temperature of the drum to a third threshold temperature lower than the second threshold temperature, while being set and maintained at the third threshold temperature. The drum may be rotated at the first critical speed.

The drainage unit may further include a drainage unit, and may control the drainage unit so that the additive contained in the drum is discharged to the outside before the internal temperature of the drum is set to a third critical temperature.

Meanwhile, according to another embodiment of the present invention, a control method of a washing machine includes the steps of setting the internal temperature of a drum to a first critical temperature through a temperature controller configured to adjust the internal temperature of a drum containing laundry by generating hot and cold air. , when the temperature is set to the first critical temperature, injecting an additive for coating the laundry with fragrance particles into the drum; and setting a second threshold temperature lower than the first threshold temperature.

The drum may rotate at a first threshold speed while the internal temperature of the drum is set and maintained at the first threshold temperature or the second threshold temperature.

The method may further include rotating the drum at a second critical speed faster than the first critical speed before introducing the additive into the drum, wherein the introducing step is such that the rotational speed of the drum is set to the first critical speed. When the 2 critical speed is reached, the additive may be introduced into the drum.

And, in the step of rotating the drum at the second critical speed, before the rotational speed of the drum reaches the second critical speed, if the vibration intensity according to the rotation of the drum is greater than or equal to a predetermined threshold intensity, the drum After the rotation ends, the drum may be rotated again at the second critical speed.

In addition, in the introducing, the additive may not be introduced into the drum when the sensed vibration intensity is greater than or equal to a preset threshold intensity after the drum is re-rotated for a preset threshold number of times.

In the introducing, the additive may be introduced into the drum according to whether the rotational speed of the drum reaches the second critical speed within a predetermined critical time.

In addition, the setting to the first threshold temperature may include setting the internal temperature of the drum to be maintained at the first threshold temperature for a first threshold time, and rotating the drum at the second threshold speed. After 1 threshold time, the drum may be rotated at a second threshold speed faster than the first threshold speed.

The setting to the second threshold temperature may include setting the internal temperature of the drum to be maintained at the second threshold temperature for a second threshold time shorter than the first threshold time.

The method further includes setting the internal temperature of the drum to a third threshold temperature lower than the second threshold temperature through the temperature controller after the second threshold time, wherein the drum is set to the third threshold temperature. And it can rotate at the first threshold speed while being maintained.

The method may further include discharging the additive contained in the drum to the outside through a drain before the internal temperature of the drum is set to a third critical temperature.

As described above, according to the present invention, when washing laundry through the refresh process, the washing machine can provide the same effect as laundry washed in the general wash process.

1 is a perspective view showing the appearance of a washing machine according to an embodiment of the present invention;
2 is a side cross-sectional view showing the inside of a washing machine according to an embodiment of the present invention;
3 is an exploded perspective view of a temperature controller according to an embodiment of the present invention;
4 is a block diagram of a washing machine performing a refresh process according to an embodiment of the present invention;
5 is a detailed block diagram of a washing machine according to an embodiment of the present invention;
6 is an exemplary diagram illustrating a step of performing a refresh process in a washing machine according to an embodiment of the present invention;
7 is an exemplary view showing an operating state of each component at each stage of a refresh process in a washing machine according to an embodiment of the present invention;
8 is an example of providing a UI according to event occurrence in the washing machine according to an embodiment of the present invention;
9 is a flowchart of a method of performing a refresh process in a washing machine according to an embodiment of the present invention;
10 is a first flowchart of a method for determining whether an additive is put into a drum in a washing machine according to an embodiment of the present invention;
11 is a second flow chart of a method for determining whether an additive is to be put into a drum in a washing machine according to another embodiment of the present invention.

Hereinafter, various embodiments of this document will be described with reference to the accompanying drawings. However, this is not intended to limit the technology described in this document to specific embodiments, and is to be understood as including various modifications, equivalents, and/or alternatives of the embodiments of this document. In connection with the description of the drawings, like reference numerals may be used for like elements.

In addition, expressions such as “first,” “second,” etc. used in this document may modify various components regardless of order and/or importance, and to distinguish one component from another. It is used only and does not limit the corresponding components. For example, 'first part' and 'second part' may indicate different parts regardless of order or importance. For example, without departing from the scope of rights described in this document, a first element may be called a second element, and similarly, the second element may also be renamed to the first element.

In addition, terms used in this document are only used to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field described in this document. Among the terms used in this document, terms defined in a general dictionary may be interpreted as having the same or similar meaning as the meaning in the context of the related art, and unless explicitly defined in this document, an ideal or excessively formal meaning. not be interpreted as In some cases, even terms defined in this document cannot be interpreted to exclude the embodiments of this document.

1 is a perspective view showing an exterior of a washing machine according to an embodiment of the present invention, and FIG. 2 is a cross-sectional side view showing the inside of the washing machine according to an embodiment of the present invention.

As shown in FIGS. 1 and 2 , the washing machine 100 includes a main body 10 forming an exterior, a tub 15 accommodating water used for washing, and capable of accommodating laundry, and washing laundry through rotation. a drum 20 that rotates the drum 20, a drive unit 30 that rotates the drum 20, a water supply unit 40 that supplies water to the tub 15, and a water drainage that discharges water accommodated in the tub 15 to the outside of the washing machine 100. unit 50, an additive input unit 60 for supplying additives into the drum 20, a temperature control unit 70 for controlling the air temperature in the drum 20 so that laundry stored in the drum 20 is dried, and a drum A filter unit 80 for filtering out lint generated from laundry stored in 20 is included.

In addition, the washing machine 100 includes a controller 120, and as described above, the controller 120 controls operations for each of the components for washing, drying, and refreshing the laundry stored in the drum 20. overall control. Here, the refresh process is a process for sterilizing and deodorizing the laundry stored in the drum 20 without performing the washing process.

Meanwhile, an inlet 11 for putting or taking out laundry into the drum 20 is formed at the center of the front surface of the main body 10, and a door 13 for opening and closing the inlet 11 is provided in the inlet 11. do. Such a door 13 is rotatably mounted on the main body 10 by a hinge, and may be formed so as not to be easily opened by a hook when the inlet 11 is closed.

In addition, the upper side of the front surface where the inlet 11 is formed includes an input unit 110 for receiving user commands for washing, drying, and refreshing processes, and a display unit 130 for displaying operation information related to each operation. A control panel 5 is disposed. However, the present invention is not limited thereto, and the control panel 5 including the input unit 110 and the display unit 113 is disposed on one side or the lower side of the front surface, or on one area of the upper surface or the left and right sides of the main body 10. can be placed in

Specifically, the input unit 110 may be an input device that receives commands from a user related to the operation of the washing machine 100, such as washing time, number of rinses, spin-drying time, drying time, time related to a refresh process, and operation and pause. there is. Such an input unit 110 may include a touch input unit 111 that receives a touch command from a user and a manipulation unit 113 that receives a user's operation command.

The display unit 130 displays the amount of laundry, washing and drying process, water temperature information, rinsing information, spinning strength, washing time information, refresh process progress information, and the like. The display unit 130 may be implemented with a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, or the like.

Meanwhile, the aforementioned touch input unit 111 may be implemented as a touch pad forming a mutual layer structure with the display unit 130. In this case, the touch input unit 111 and the display unit 130 may be implemented in a touch screen form. can

The tub 15 is provided inside the main body 10 and includes a cylindrical tub rear member 15b with a closed rear surface and a tub front member 15a disposed in front of the tub rear member 15b. Also, a driving unit 30 for rotating the drum 20 is provided on the rear surface of the tub rear member 15b.

According to the embodiment, the drive unit 30 includes a drive motor for rotating the drum 20, a drive shaft connecting the drum 20 and the drive motor, and a drive shaft rotated by the drive motor and a bearing housing supporting the drive shaft to be rotatable. can do. Thus, the drum 20 can rotate around the driving shaft rotated by the driving motor.

Depending on the embodiment, the drive motor may be implemented as a brushless direct current (BLDC) motor or a synchronous alternating current (AC) motor for easy rotational speed control.

Meanwhile, on the upper side of the tub rear member 15b, there is an induction pipe 15c for guiding air inside the drying unit 70, the filter unit 80, the tub 15, and the drum 20 to the side of the drying unit 70. ) is provided. In addition, an opening 15d is provided on the front side of the tub front member 15a to put or take out laundry into the drum 15, and air introduced through the guide tube 15c is provided on the upper side of the opening 15d. The tub 15 and the drying unit 70 for transferring the inside of the drum 20 are provided.

In addition, a temperature sensor 16 for detecting the temperature inside the tub 15 may be provided inside the tub 15 . In addition, the tub 15 is connected to the water supply unit 40 and the additive input unit 60 through a connection pipe 74 provided on the upper side of the tub 15, so that additives diluted by washing water can be supplied. Here, the additive may be a material diluted by washing water, such as a detergent for washing laundry or a fabric softener for coating fragrance particles on laundry.

In addition, the tub 15 is connected to the drain unit 50 through a drain pipe 51 provided at the lower side of the tub 15 to discharge wash water contained in the tub 15 to the outside of the washing machine 100 .

The drum 20 is rotatably provided inside the tub 15, and includes a plurality of through holes 20a through which wash water accommodated in the tub 15 flows into the drum 20, and wash water introduced into the drum 20. and an opening 20c for discharging wash water introduced into the drum 20 and a lifter 20b for lifting the drum upward.

The water supply unit 40 is provided above the tub 20 and transfers wash water supplied from a water supply source (not shown) to the additive input unit 60 through a water supply pipe. That is, the water supply unit 40 may receive wash water supplied from a water supply source (not shown) through the water supply pipe by opening a water supply valve provided on one side of the water supply pipe according to a control command of the control unit 120 to be described later. . Here, the water supply valve may be implemented as a solenoid valve according to an embodiment. The wash water supplied through the water supply unit 40 flows into the additive input unit 60, and the detergent or fabric softener supplied to the additive supply unit 60, along with the wash water supplied into the additive input unit 60, flows into the connecting pipe. It may be supplied into the tub 15 through 74.

The drainage unit 50 is provided on the lower side of the tub 15, and discharges wash water pumped through the drainage pump into the tub 20 out of the main body 10 through the drainage hose.

The temperature control unit 70 is provided above the tub 15 and regulates the internal temperature of the drum 20 by generating hot and cold air so that the laundry stored in the drum 20 can be dried during the drying cycle. In addition, the temperature control unit 70 controls the internal temperature of the drum 20 by generating hot air and cold air so that the laundry stored in the drum 20 can be sterilized and deodorized during the refresh process.

Here, the refresh process does not use wash water for the laundry stored in the drum 20, but generates hot air and cold air provided inside the drum 20 through the temperature controller 70 to clean the laundry stored in the drum 20. It may be a washing process for providing the same effect as water washing by sterilizing.

Meanwhile, the temperature control unit 70 sucks air inside the tub 15 and the drum 20, heats the sucked air, and discharges it to the tub 15 and the drum 20.

The filter unit 80 is provided between the temperature control unit 70 and the tub 15, and air inside the tub 15 and the drum 20 is sucked into the temperature control unit 70 during a drying or refreshing process. During this process, foreign substances including lint are filtered out so that foreign substances including lint generated by laundry stored in the drum 20 are not absorbed into the temperature controller 70 .

The filter unit 80 may include a washing unit (not shown) for removing foreign substances including lint filtered by the filter unit 80 . Therefore, the foreign substances filtered out by the filter unit 80 are periodically removed by a washing unit (not shown), so that the air inside the tub 150 and the drum 20 is removed by the filter unit 80. (70), it is possible to improve the problem that the efficiency of drying, sterilization, etc. of laundry is lowered.

3 is an exploded perspective view of a temperature controller according to an embodiment of the present invention.

As shown in FIG. 3 , the temperature control unit 70 may include a drying duct 71 , a suction unit 72 and a heater unit 73 .

The drying duct 71 heats the air introduced from the tub 15 and the drum 20 and transfers it to the tub 15 . Specifically, the drying duct 71 includes a duct upper plate 71a and a duct lower plate 71b, and one end where the duct upper plate 71a and the duct lower plate 71b are combined is connected to the tub front member 15a, , the other end is connected to the tub rear member 15b. Accordingly, the drying duct 71 may transfer air introduced from the tub rear member 15b to the tub front member 15a through a passage formed by combining the duct upper plate 71a and the duct lower plate 71b.

The suction unit 72 sucks in the air in the tub 15 and the drum 20 and transfers it to the drying duct 71 . The suction unit 72 includes a suction fan 72a and a suction motor 72b for rotating the suction fan 72a. The suction fan 72a is located in a lower plate opening (not shown) formed in the lower duct 71b of the drying duct 71, and the suction motor 72b is located in the upper plate opening formed in the duct upper plate 71a of the drying duct 71. (not shown).

In addition, the heater unit 73 heats the internal air of the tub 15 and the drum 20 sucked through the suction unit 72 . The heater unit 73 may be formed in a passage formed by combining the duct upper plate 71a and the duct lower plate 71b. Therefore, the heater unit 73 can heat the air inside the tub 15 and the drum 20 introduced into the drying duct 71 through the suction unit 72, and the drying duct 71 is a heater unit ( Air heated by 73) may be delivered to the tub front member 15a.

Additionally, a temperature sensor (not shown) may be provided in a passage formed by combining the duct upper plate 71a and the duct lower plate 71b. Specifically, the temperature sensor (not shown) is located in a direction connected to the tub front member 15a. Accordingly, the temperature sensor (not shown) may measure the temperature of the air heated through the heater unit 73 .

As described above, the drying duct 71 heats the air in the tub 15 and the drum 20 sucked by the suction unit 72 into the drying duct 71 through the heater unit 73, Heated air may be delivered into the tub 15 and the drum 20 . Therefore, during the drying process or the refreshing process, the air in the tub 15 and the drum 20 can be maintained at an appropriate temperature.

So far, each configuration of the washing machine 100 according to the present invention has been schematically described. Hereinafter, each component of the washing machine 100 performing the laundry refreshing process according to the present invention will be described in detail.

4 is a block diagram of a washing machine performing a refresh process according to an embodiment of the present invention.

As described above, the washing machine 100 is a washing device capable of performing a washing cycle, a drying cycle, and a refresh cycle, and may be, for example, a drum washing machine. When such a washing machine 100 performs a refresh process, it can perform not only sterilization treatment for the laundry accommodated in the drum 20, but also a function of coating fragrance particles on the laundry with an additive such as a fabric softener. .

To this end, the washing machine 100 may include a drum 20, a drive unit 30, a temperature control unit 70, and an additive input unit 60, as shown in FIG. 4 .

As described above, the drum 200 accommodates the laundry, and the driving unit 30 rotates the drum 20 in which the laundry is accommodated. Specifically, the driving unit 30 may rotate the drum 20 in which laundry is accommodated by driving a driving motor. In addition, the drive unit 30 may drive the water supply unit 40 to supply washing water into the tub 15 or drive the drain unit 50 to discharge the wash water contained in the tub 15 to the outside of the washing machine 100. there is.

The temperature control unit 70 controls the internal temperature of the drum 20 by generating hot air and cold air. Accordingly, the laundry stored in the drum 20 can be sterilized by hot air and cold air generated by the temperature controller 70 .

The additive injection unit 60 injects additives for coating fragrance particles on laundry into the drum 20 . Specifically, when a material such as a fabric softener is input by a user, the additive input unit 60 dilutes the material with wash water and inserts the diluted additive into the drum 20 .

The controller 120 generally controls operations of each element constituting the washing machine 100 . In particular, when a user command for the refresh process is input, the control unit 120 performs a first refresh process by controlling the temperature control unit 70 to set the temperature in the drum 20 to a first threshold temperature. At this time, the controller 120 controls the temperature controller 70 so that the temperature in the drum 20 is maintained at the first threshold temperature for a first threshold time. Accordingly, the temperature controller 70 generates hot air until the temperature in the drum 20 is set to the first critical temperature, and when the temperature in the drum 20 is set to the first critical temperature, the first critical temperature The internal temperature of the drum 20 is adjusted so that the temperature inside the drum 20 can be maintained at the first critical temperature for a first critical time from the time set to .

Depending on the embodiment, the first critical temperature is an appropriate temperature that is advantageous for deodorizing laundry by sterilizing laundry stored in the drum 20 and that is advantageous for fragrance particles to be applied to laundry through additives to be introduced into the drum 20. For example, it may be 65 ° C to 70 ° C.

Also, the first threshold time may be 1/2 of the total time for performing the refresh process. For example, when the total time for performing the refresh process is 29 minutes, the first threshold time may be about 14 to 15 minutes.

As described above, after the internal temperature of the drum 20 is set to the first critical temperature and a predetermined first critical time passes, the control unit 120 controls the additive input unit 60 so that the additive is injected into the drum 20. do. Accordingly, the additive input unit 60 dilutes a material such as a fabric softener contained in the additive input unit 60 in washing water and then inserts the substance into the drum 20 .

Thereafter, the control unit 120 controls the temperature control unit 70 so that the temperature in the drum 20 is set to a second critical temperature lower than the first critical temperature when all the additives are put into the drum 20. Execute the refresh operation. At this time, the controller 120 controls the temperature controller 70 so that the temperature in the drum 20 is maintained at the second threshold temperature for a second threshold time.

Accordingly, the temperature control unit 70 generates hot air so that the temperature in the drum 20 is set to the second critical temperature, and when the temperature in the drum 20 is set to the second critical temperature, the drum for the second critical time. The internal temperature of the drum 20 is adjusted so that the temperature inside the drum 20 can be maintained at the second critical temperature.

Depending on the embodiment, the second critical temperature is an appropriate temperature that is advantageous for preventing fragrance particles of an additive coated on the laundry from disappearing from the laundry while the laundry put into the drum 20 is sterilized, and is, for example, 55°C to 60°C. C can be

And, the second threshold time is less time than the aforementioned first threshold time, and may be, for example, about 2 to 3 minutes.

Meanwhile, the control unit 120 may rotate the drum 20 at the first critical speed while the internal temperature of the drum 20 is set to the first critical temperature or the second critical temperature. In detail, the control unit 120 controls the temperature of the drum 20 at the first threshold temperature during the first refresh operation period in which the internal temperature is set and maintained at the first threshold temperature or during the second refresh operation period in which the temperature is set and maintained at the second threshold temperature. The driving unit 30 is controlled so that the drum 20 rotates at the speed. Depending on embodiments, the first threshold speed may be 40 rpm. Accordingly, the drive unit 30 may rotate the drum 20 at a speed of 40 rpm.

Accordingly, the drum 20 accommodating laundry may be rotated at a speed of 40 rpm by the driving unit 30 during the first and second refresh cycles.

According to an additional aspect of the present invention, the control unit 120 may rotate the drum 20 in predetermined time units during the second refresh cycle. That is, the control unit 120 may control the drive unit 30 so that the drum 20 operates on a time-by-time basis during the second refresh cycle. For example, the controller 120 may control the driving unit 30 to rotate and stop the drum 20 every 5 seconds during the second refresh cycle. Accordingly, the drive unit 30 may rotate the drum 20 at a speed of 40 prm at intervals of 5 seconds during the second refresh cycle.

Meanwhile, the control unit 120 rotates the drum 20 at a second critical speed faster than the first critical speed before the additive is introduced into the drum 20, and the rotational speed of the drum 20 is the second critical speed. When it reaches , the additive input unit 60 is controlled so that the additive is injected into the drum 20 .

That is, as described above, the control unit 120 controls the driving unit 30 to rotate the drum 20 at the second critical speed when the first refresh process is finished. Here, the second threshold speed may be 400 rpm. Accordingly, the drive unit 30 may rotate the drum 20 at a speed of 400 rpm.

As such, when the rotational speed of the drum 20 reaches the second critical speed by the drive unit 30, the control unit 120 controls the additive input unit 60 so that the additive is injected into the drum 20. Accordingly, the additive inlet unit 60 may inject the additive into the drum 20 . Meanwhile, the drive unit 30 may rotate the drum 20 at a second critical speed while all the additives are injected into the drum 20 through the additive input unit 60 . In this way, as the drum 20 rotates at the second critical speed while the additive is introduced, the laundry stored in the drum 20 may be coated with fragrance particles by the additive while the laundry is not wet by the additive.

Meanwhile, according to an additional aspect of the present invention, the control unit 120 may determine whether to introduce the additive into the drum 20 through the following embodiments.

According to an embodiment, the controller 120 may determine whether or not to insert additives into the drum 20 according to the vibration state of the drum 20 in which laundry is accommodated.

Specifically, while the drum 20 rotates, the control unit 120 may periodically obtain the vibration intensity of the drum 20 based on sensor information sensed by the sensing unit 170 to be described later. Therefore, the control unit 120 controls the drive unit 30 to rotate at the second threshold speed after the first refresh process is finished, based on the sensing information sensed from the sensing unit 170. The obtained vibration intensity is compared with a predetermined threshold intensity.

That is, the control unit 120 compares the vibration intensity obtained based on the sensing information sensed from the sensor 170 with a predetermined threshold intensity until the rotational speed of the drum 20 reaches the second threshold speed. As a result of the comparison, if the vibration intensity is equal to or greater than the predetermined threshold intensity, the controller 120 restarts the drum 20 at the second threshold speed after ending the rotation of the drum 20 . That is, if the vibration intensity of the drum 20 before the rotational speed of the drum 20 reaches the second threshold speed is greater than or equal to the threshold intensity, the control unit 120 controls the second threshold speed after the rotation of the drum 20 is finished. and controls the driving unit 30 to re-rotate. Accordingly, the driving unit 30 may restart the rotation of the drum 20 after stopping it.

Thereafter, the control unit 120 compares the vibration intensity of the re-rotated drum 20 with a predetermined threshold intensity, and when the vibration intensity is less than the preset threshold intensity until the rotational speed of the drum 20 reaches the second threshold speed, , The additive input unit 60 is controlled so that the additive is injected into the drum 20 . Accordingly, the additive injecting unit 60 may inject the additive into the drum 20 while the drum 20 rotates at the second critical speed.

On the other hand, the control unit 120 compares the vibration intensity of the re-rotated drum 20 with a preset threshold intensity, and if the vibration intensity is greater than the preset threshold intensity until the rotational speed of the drum 20 reaches the second threshold velocity, , Controls the driving unit 30 to re-rotate at the second critical speed after the rotation of the drum 20 is finished.

On the other hand, if the control unit 120 re-rotates the drum 20 for a predetermined critical number of times and the vibration intensity detected through the sensor 170 is equal to or greater than the predetermined critical strength, the additive is not injected into the drum 20. The additive input unit 60 is controlled so as not to

That is, after the controller 120 re-rotates the drum 20 for a preset threshold number of times, if the vibration intensity detected through the sensor 170 is equal to or greater than the preset threshold intensity, the second refresh cycle is performed after the first refresh cycle. The temperature controller 70 may be controlled so that the stroke proceeds. Accordingly, the laundry contained in the drum 20 is not coated with fragrance particles by the additive, and can only be sterilized and deodorized.

According to another embodiment, the control unit 120 may inject the additive into the drum 20 according to whether the rotational speed of the drum 20 reaches the second critical speed within a predetermined critical time after the first refreshing process is finished. You can decide whether or not to invest.

Specifically, the control unit 120 controls the rotational speed of the drum 20 for a predetermined threshold time from the point at which the first refresh process is finished and the driving unit 30 is controlled so that the drum 20 rotates at the second threshold speed. It is determined whether is rotating at the second threshold speed. As a result of the determination, when the rotational speed of the drum 20 reaches the second rotational speed within the second critical time, the control unit 120 controls the additive injection unit 60 so that the additive is injected into the drum 20. Accordingly, the additive injecting unit 60 may inject the additive into the drum 20 while the drum 20 rotates at the second critical speed.

Meanwhile, when the rotational speed of the drum 20 does not reach the second critical speed for a predetermined critical time, the control unit 120 controls the additive input unit 60 so that additives are not introduced into the drum 20 .

That is, if the rotational speed of the drum 20 does not reach the second threshold speed within a predetermined threshold time, the control unit 120 controls the temperature control unit 70 so that the second refresh cycle proceeds after the first refresh cycle. You can control it. Accordingly, the laundry contained in the drum 20 is not coated with fragrance particles by the additive, and can only be sterilized and deodorized.

According to a further aspect of the present invention, the controller 120 controls the temperature controller 60 to set the internal temperature of the drum 20 to a third threshold temperature lower than the aforementioned second threshold temperature after the second refresh process is finished. ) may be performed to control the third refresh process.

Specifically, the controller 120 controls the temperature controller 60 so that the internal temperature of the drum 20 is set to a third threshold temperature lower than the second threshold temperature after a second threshold time period during which the second refresh process is performed. do. Accordingly, the temperature controller 70 generates hot air until the temperature in the drum 20 is set to the third critical temperature.

Meanwhile, when the temperature inside the drum 20 is set to the third critical temperature by the temperature controller 70, the controller 120 maintains the temperature inside the drum 20 at the third critical temperature for a predetermined third critical time. The temperature controller 70 is controlled so as to be. Accordingly, when the temperature in the drum 20 is set to be maintained at the third critical temperature, the temperature controller 70 maintains the temperature in the drum 20 at the third critical temperature for a predetermined third critical time. The temperature inside the drum 20 is controlled.

Depending on the embodiment, the preset third threshold temperature is a temperature lower than the aforementioned first and second threshold temperatures, for example, may be 55° C., and the preset third threshold time is the aforementioned second threshold time. can be the same time as

Meanwhile, the control unit 120 controls the driving unit 30 to rotate the drum 20 at the first critical speed while the temperature inside the drum 20 is set and maintained at the third critical temperature. Depending on the embodiment, the first threshold speed may be the aforementioned 40rmp. Accordingly, the drive unit 30 may rotate the drum 20 at a speed of 40 rpm.

On the other hand, according to an additional aspect of the present invention, the control unit 120, before the internal temperature of the drum 20 is set to the third critical temperature by the temperature controller 70, the additives accommodated inside the drum 20 to the outside The drainage unit 50 is controlled to be discharged. That is, the control unit 120 controls the drainage unit 50 to discharge the additives stored in the drum 20 to the outside when the second refreshing process is finished. According to such a control command, the drainage unit 50 may discharge the additives contained in the drum 20 to the outside.

5 is a detailed block diagram of a washing machine according to an embodiment of the present invention.

As shown in FIG. 5 , the washing machine 100 includes an input unit 110, a display unit 130, a storage unit 140, an audio output unit 150, a communication unit 160, and a sensing unit 170 in addition to the above-described configuration. ) may further include.

Since descriptions of the input unit 110 and the display unit 130 have been described in detail above, detailed descriptions thereof will be omitted.

The storage unit 140 may store control information and operation programs for executing operations related to washing, drying, and refreshing processes of the washing machine 100 . Here, the control information may include driving information for rotating the drum 20 for each stroke, information for setting the internal temperature of the drum 20, and the like, as described above. Also, when the washing machine 100 is turned on, the operating program may be a program that is read from the storage unit 140 and compiled to operate each component of the washing machine 100 . The storage unit 140 may include ROM, RAM, or a memory card (eg, SD card, memory stick) removable/mountable in the washing machine 100, a non-volatile memory, a volatile memory, a hard disk drive (HDD), or a solid state drive. (SSD).

The audio output unit 150 outputs operating states related to washing, drying, and refreshing processes of the washing machine 100 through a speaker (not shown) in the form of audible sounds.

The communication unit 160 performs wireless communication with at least one user terminal device (not shown). According to an embodiment, the communication unit 160 communicates with a user terminal device (not shown) through a short-range communication module such as a Bluetooth module, a Near Field Communication (NFC) module, a WiFi module, or a Zigbee module. Data communication may be performed to transmit status information related to washing, drying, and refreshing processes to a user terminal device (not shown), or control commands for each process may be received from the user terminal device (not shown). .

In addition, the communication unit 160, like a wireless LAN module, may perform communication by being connected to an external network according to a wireless communication protocol such as IEEE.

The sensor 170 detects operating states related to the washing process, the drying process, and the refreshing process of the washing machine 100 . Depending on the embodiment, the sensing unit 170 may include a sensor that detects vibration intensity according to rotation of the drum 20 in which laundry is stored during the refreshing process. In addition, the sensor 170 detects the temperature of the air inside the tub 15 and the drum 20 or a temperature sensor that detects the temperature of the air heated by the drying unit 70, and the drum 20 containing the laundry. ) may further include a sensor for measuring the weight of the

6 is an exemplary diagram illustrating a step of performing a refresh process in the washing machine according to an embodiment of the present invention.

As shown in FIG. 6 , the washing machine 100 maintains the internal temperature of the drum 20 at the first threshold temperature for a first threshold time when a refresh command is input while laundry is stored in the drum 20 . A first refresh step (first direction step) 610 of generating hot air is performed. Here, the first threshold time may be about 1/2 of the total time during which the refresh process is performed, and the first threshold temperature may be 65°C to 70°C.

Through the first refresh step 610, the washing machine 100 sterilizes the laundry stored in the drum 20 to deodorize the laundry. In addition, through the first refreshing step 610, in the washing machine 100, the scent particles of the additive injected into the drum 20 in the step described later may diffuse within the drum 20.

After the first refresh step (610), the washing machine 100 performs a water supply step (620) in which additives for coating fragrance particles are applied to the laundry stored in the drum 20. That is, in the water supply step 620, the washing machine 100 inserts an additive obtained by diluting a material such as a fabric softener in wash water into the drum 20.

After the water supply step 620, the washing machine 100 performs a second refresh step (second direction step) 630 of generating hot air so that the internal temperature of the drum 20 is maintained at the second threshold temperature for a second threshold time. carry out Here, the second threshold time may be less than the first refresh step time described above, and the second threshold temperature may be 55°C to 60°C.

Through the second refreshing step 630, the washing machine 100 may attach fragrance particles of additives introduced into the drum 20 to laundry stored in the drum 20.

After the second refreshing step (630), the washing machine 100 performs a draining step (640) of discharging the additives contained in the drum 20 to the outside.

After the draining step 640, the washing machine 100 performs a third refreshing step (third direction step) 650 of generating cool air so that the internal temperature of the drum 20 is lowered to the third threshold temperature for a third threshold time. carry out Here, the third threshold time may be the same time as the time during which the internal temperature of the drum 20 is maintained in the above-described second refresh step 630, and the third threshold temperature may be 55°C.

Through the third refreshing step 650, the washing machine 100 may fix fragrance particles of additives attached to the laundry contained in the drum 20 to the laundry.

FIG. 7 is an exemplary diagram illustrating an operating state of each component in each step of a refresh process in the washing machine according to an embodiment of the present invention.

As shown in FIG. 7 , the washing machine 100 circulates air inside the drum 20 through the temperature control unit 70 during the refresh cycle to dry the laundry stored in the drum 20 . That is, the washing machine 100 may circulate the air inside the drum 20 through the suction part 72 included in the temperature control part 70 while performing the refresh cycle to dry the laundry stored in the drum 20. there is.

Meanwhile, the washing machine 100 turns on the temperature controller 70 during the first refresh step 610 of each step constituting the refresh process. Accordingly, when each component constituting the temperature controller 70 is activated, the washing machine 100 raises the internal temperature of the drum 20 to a predetermined first critical temperature by hot air generated through the temperature controller 70. can be set up and maintained. Also, the washing machine 100 drives the driving unit 30 so that the drum 20 rotates at a speed of 40 rpm during the first refreshing step 610 .

During the water supply step 620 after the first refresh step 610, the washing machine 100 turns off the heater unit 73 among the components constituting the temperature control unit 70, and the drum 20 The driving unit 30 is driven to rotate at this speed of 400 rpm. In this way, as the drum 20 rotates at a speed of 400 rpm, it is possible to prevent the laundry stored in the drum 20 from getting wet due to the additives injected into the drum 20 . When the drum 20 rotates at a speed of 400 rpm, the washing machine 100 injects additives into the drum 20 through the additive inlet 90 . Depending on the embodiment, the washing machine 100 may inject about 1.5 L of additives into the drum 20 through the additive input unit 90 .

During the second refresh step 630 after the water supply step 620, the washing machine 100 turns on the temperature controller 70. Accordingly, when each component constituting the temperature controller 70 is activated, the washing machine 100 raises the internal temperature of the drum 20 to a predetermined second critical temperature by hot air generated through the temperature controller 70. can be set up and maintained. Also, the washing machine 100 drives the driving unit 30 so that the drum 20 rotates at a speed of 40 rpm during the second refreshing step 630 .

During the draining step 640 after the second refreshing step 630, the washing machine 100 turns off the heater 73 constituting the temperature control unit 70 and the driving unit 30 that rotates the drum 20. (Off), and turns on the drainage unit 50 so that the additives accommodated in the drum 20 are discharged to the outside. Accordingly, when the drainage part 50 is opened, the additive contained in the drum 20 may be discharged to the outside.

After the draining step (640) and during the third refreshing step (650), the washing machine 100 drives the driving unit 30 so that the drum 20 rotates at a speed of 40 rpm. At this time, the washing machine 100 turns off the drainage unit 50 when the draining step 640 ends and the third refreshing step 650 starts. At this time, the heater unit 73 constituting the temperature control unit 70 may also be maintained in an off state.

8 is an exemplary view of providing a UI according to event occurrence in the washing machine according to an embodiment of the present invention.

The washing machine 100 may determine whether to put the additive into the drum 20 through the above-described embodiment.

As described above, when the water supplying step 620 is initiated, the washing machine 100 determines the detected vibration intensity of the drum 20 and the preset threshold intensity until the rotational speed of the drum 20 reaches the second threshold speed. Compare As a result of the comparison, if the vibration intensity is greater than or equal to the predetermined threshold intensity, the washing machine 100 restarts the drum 20 at the second threshold speed after the rotation of the drum 20 ends.

Thereafter, the washing machine 100 re-rotates the drum 20 for a preset threshold number of times, and when the detected vibration intensity of the drum 20 is equal to or greater than the preset threshold intensity, the display unit 113 displays “Put laundry back in.” Please display the UI 810.

Also, when the water supplying step 620 starts, the washing machine 100 determines whether the rotational speed of the drum 20 reaches the second threshold speed within a preset threshold time. As a result of the determination, if the second threshold speed is not reached within a preset threshold time, the washing machine 100 displays a UI 810 saying "Please put laundry again" through the display unit 113 .

Accordingly, the user may put the laundry stored in the drum 20 again according to the UI 810 displayed through the display unit 113 .

When the water supply step 620 is re-performed after the laundry is accommodated in the drum 20 again, the washing machine 100 determines whether the drum 20 normally reaches the second threshold speed through the above-described embodiment. As a result of the determination, if it is determined that the second critical speed is not reached, the washing machine 100 ends the water supply step 620 in which the additive is introduced into the drum 20 . Also, the washing machine 100 skips the second refresh step 630 and the drain step 640 and performs the third refresh step 650 .

So far, each component of the washing machine 100 performing the refresh process according to the present invention has been described in detail. Hereinafter, a method of performing a refresh process in the washing machine 100 according to the present invention will be described in detail.

9 is a flowchart of a method of performing a refresh process in a washing machine according to an embodiment of the present invention.

As shown in FIG. 9 , when a user command for a refresh operation is input while laundry is accommodated in the drum, the washing machine 100 sets the internal temperature of the drum to a first critical temperature, and sets the drum at a first critical speed. Rotate (S910)

Specifically, the washing machine 100 may set the internal temperature of the drum as a first threshold temperature through a temperature controller that controls the internal temperature of the drum in which the laundry is stored by generating hot and cold air. Also, when the internal temperature of the drum is set to the first threshold temperature, the washing machine 100 maintains the internal temperature of the drum at the first threshold temperature for a predetermined first threshold time. Also, the washing machine 100 rotates the drum at the first critical speed while the internal temperature of the drum is set to and maintained at the first critical temperature.

Here, the first critical temperature is an appropriate temperature that is advantageous for deodorizing the laundry by sterilizing the laundry stored in the drum, and is advantageous for the fragrance particles to be applied to the laundry through the additives to be introduced into the drum. can

Also, the first threshold time may be 1/2 of the total time for performing the refresh process. For example, when the total time for performing the refresh process is 29 minutes, the first threshold time may be about 14 to 15 minutes.

Also, the first threshold speed may be 40 rpm.

Thereafter, the washing machine 100 rotates the drum at a second critical speed, and when the drum speed reaches the second critical speed, the additive is injected into the drum (S920 and S930). Here, the second threshold speed may be a speed higher than the first threshold speed. For example, the second threshold speed may be 400 rpm. In addition, the additive may be a material diluted by washing water, such as a detergent for washing laundry or a fabric softener for coating fragrance particles on laundry.

That is, when the drum rotates at the second critical speed, the washing machine 100 injects additives into the drum while the drum rotates at the second critical speed. Accordingly, the laundry stored in the drum may be coated with fragrance particles by the additive in a state in which the laundry is not wet by the additive.

When all of the additives are injected into the drum, the washing machine 100 sets the internal temperature of the drum to a predetermined second critical temperature and rotates the drum at a first critical speed (S940). In this case, the washing machine 100 may maintain the internal temperature of the drum at the preset second threshold temperature for a preset second threshold time.

Here, the second critical temperature is an appropriate temperature that is advantageous for preventing scent particles of additives coated on laundry from disappearing from laundry while the laundry put into the drum is being sterilized, and may be, for example, 55°C to 60°C. And, the second threshold time is less time than the aforementioned first threshold time, and may be, for example, about 2 to 3 minutes. Also, as described above, the first threshold speed may be 40 rpm.

Thereafter, the washing machine 100 discharges the additives contained in the drum to the outside through the drainage part (S950).

Thereafter, the washing machine 100 sets the internal temperature of the drum to a predetermined third threshold temperature and rotates the drum at a first threshold speed (S960). At this time, when the internal temperature of the drum reaches the preset third threshold temperature, the washing machine 100 maintains the temperature inside the drum at the third threshold temperature for a preset third threshold time.

Here, the preset third threshold temperature is a temperature lower than the aforementioned first and second threshold temperatures, for example, may be 55° C., and the preset third threshold time is the same as the aforementioned second threshold time. This can be. Also, the first critical speed may be the aforementioned 40 rpm.

Meanwhile, the washing machine 100 may determine whether to put the additive into the drum through the following examples.

10 is a first flow chart of a method of determining whether an additive is to be put into a drum in a washing machine according to an embodiment of the present invention.

As shown in FIG. 10 , the washing machine 100 rotates the drum at a second critical speed when the water supply step for introducing the additive into the drum starts.

Accordingly, the washing machine 100 periodically detects the vibration intensity of the drum until the rotational speed of the drum reaches the second threshold speed, and compares the sensed vibration intensity with a preset threshold (S1010).

As a result of the comparison, if the vibration intensity detected while the rotational speed of the drum reaches the second critical speed is smaller than the predetermined threshold, the washing machine 100 performs the above-described method after the rotational speed of the drum reaches the second critical speed. Additives are introduced into the drum through step S930.

Meanwhile, if the vibration intensity detected before the rotational speed of the drum reaches the second critical speed is equal to or greater than the preset threshold, the washing machine 100 terminates the rotation of the drum and then re-rotates the drum at the second critical speed ( S1020).

Thereafter, the washing machine 100 determines whether the number of times the drum is re-rotated at the second critical speed exceeds a preset threshold number, and if it is determined that the preset threshold number is exceeded, the additive is not injected into the drum ( S1030, S1040). That is, when it is determined that the number of re-spins exceeds the preset threshold number, the washing machine 100 does not perform steps S930 to S950 and performs step S960 described above.

11 is a second flow chart of a method for determining whether an additive is to be put into a drum in a washing machine according to another embodiment of the present invention.

As shown in FIG. 11 , the washing machine 100 rotates the drum at a second critical speed when the water supply step for introducing the additive into the drum starts.

Accordingly, the washing machine 100 determines whether the rotational speed of the drum reaches the second threshold speed within a predetermined threshold time (S1110). As a result of the determination, when the drum is rotated at the second threshold speed within a predetermined threshold time, the washing machine 100 performs the above-described step S930 to introduce additives into the drum.

Meanwhile, as a result of the determination, when it is determined that the drum does not rotate at the second critical speed within a predetermined critical time, the washing machine 100 does not input the additive (S1120). That is, when it is determined that the number of re-spins exceeds the preset threshold number, the washing machine 100 does not perform steps S930 to S950 and performs step S960 described above.

So far, the present invention has been looked at with respect to its preferred embodiments.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, and is common in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Of course, various modifications are possible by those with knowledge of, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

10: body 11: inlet
13: door 15: tub
16: temperature sensor 20: drum
30: drive unit 40: water supply unit
50: drainage unit 60: additive input unit
70: temperature control unit 72: intake unit
73: heater part 80: filter part
110: input unit 120: control unit
130: display unit 140: storage unit
150: audio output unit 160: communication unit
170: sensing unit

Claims (20)

a drum containing laundry;
an additive input unit for injecting an additive for coating the laundry with fragrance particles into the drum;
a water supply unit for delivering wash water to the additive input unit;
a temperature controller configured to control the internal temperature of the drum by generating hot air and cold air; and
Controlling the temperature control unit so that the temperature in the drum is set to a first threshold temperature;
rotating the drum at a first critical speed while the internal temperature of the drum is set to the first critical temperature;
When the internal temperature of the drum is set to the first threshold temperature, rotating the drum at a second threshold speed faster than the first threshold speed;
When the rotational speed of the drum reaches the second critical speed, the additive input unit and the water supply unit are controlled so that wash water containing the additive is introduced into the drum;
and a control unit configured to control the temperature control unit to set the internal temperature of the drum to a second threshold temperature lower than the first threshold temperature when wash water containing the additive is put into the drum. According to claim 1,
The control unit,
The washing machine according to claim 1 , wherein the drum is rotated at the first critical speed while the internal temperature of the drum is set and maintained at the first critical temperature or the second critical temperature. delete According to claim 1,
It further includes; a sensor for detecting vibration;
The control unit,
Before the rotational speed of the drum reaches the second critical speed, if the vibration intensity detected through the sensing unit is equal to or greater than a preset threshold intensity, the drum rotates at the second critical speed after the rotation of the drum is terminated. A washing machine characterized in that it rotates. According to claim 4,
The control unit,
After re-rotating the drum for a predetermined critical number of times, if the vibration intensity detected through the sensing unit is equal to or greater than the predetermined critical intensity, the additive input unit is controlled so that the additive is not injected into the drum. According to claim 1,
The control unit,
The washing machine characterized in that the additive input unit is controlled to inject the additive into the drum according to whether the rotational speed of the drum reaches the second critical speed within a predetermined critical time. According to claim 1,
The control unit,
The washing machine according to claim 1 , wherein the temperature controller controls the temperature controller to maintain the first threshold temperature for a first threshold time period, and rotates the drum at the second threshold speed after the first threshold time period. According to claim 7,
The control unit,
The washing machine according to claim 1 , wherein the temperature control unit is controlled to maintain the second critical temperature for a second critical time shorter than the first critical time when all of the additives are injected into the drum. According to claim 8,
The control unit,
After the second threshold time, controlling the temperature control unit so that the internal temperature of the drum is set to a third threshold temperature lower than the second threshold temperature;
The washing machine according to claim 1 , wherein the drum is rotated at the first critical speed while being set and maintained at the third critical temperature. According to claim 9,
It further includes a drain;
The washing machine according to claim 1 , wherein the drain unit is controlled so that the additive contained in the drum is discharged to the outside before the internal temperature of the drum is set to the third critical temperature. In the washing machine control method,
setting the internal temperature of the drum to a first threshold temperature through a temperature controller configured to adjust the internal temperature of the drum containing the laundry by generating hot and cold air;
rotating the drum at a first threshold speed while the internal temperature of the drum is set to the first threshold temperature;
rotating the drum at a second threshold speed higher than the first threshold speed when the internal temperature of the drum is set to the first threshold temperature;
when the rotational speed of the drum reaches the second critical speed, injecting wash water containing an additive for coating the laundry with scent particles into the drum;
and setting an internal temperature of the drum to a second threshold temperature lower than the first threshold temperature through the temperature controller when the wash water containing the additive is put into the drum. ◈Claim 12 was abandoned when the registration fee was paid.◈ According to claim 11,
the drum,
and rotating at the first threshold speed while the internal temperature of the drum is set and maintained at the first threshold temperature or the second threshold temperature. delete ◈Claim 14 was abandoned when the registration fee was paid.◈ According to claim 11,
Rotating the drum at the second critical speed,
Before the rotational speed of the drum reaches the second critical speed, if the vibration intensity according to the drum rotation is equal to or greater than a predetermined critical level, the drum rotates again at the second critical speed after the rotation of the drum is terminated. A control method characterized by doing. ◈Claim 15 was abandoned when the registration fee was paid.◈ 15. The method of claim 14,
In the step of adding,
After re-rotating the drum for a predetermined critical number of times, if the vibration intensity is equal to or greater than the predetermined critical intensity, the control method characterized in that the additive is not introduced into the drum. ◈Claim 16 was abandoned when the registration fee was paid.◈ According to claim 11,
In the step of adding,
The control method characterized in that the additive is introduced into the drum according to whether the rotational speed of the drum reaches the second critical speed within a predetermined critical time. ◈Claim 17 was abandoned when the registration fee was paid.◈ According to claim 11,
The step of setting the first threshold temperature,
The internal temperature of the drum is set to be maintained at the first threshold temperature for a first threshold time,
Rotating the drum at the second critical speed,
and rotating the drum at the second threshold speed after the first threshold time. ◈Claim 18 was abandoned when the registration fee was paid.◈ 18. The method of claim 17,
The step of setting the second threshold temperature,
and setting the internal temperature of the drum to be maintained at the second threshold temperature for a second threshold time shorter than the first threshold time. ◈Claim 19 was abandoned when the registration fee was paid.◈ According to claim 18,
After the second threshold time, setting the internal temperature of the drum to a third threshold temperature lower than the second threshold temperature through the temperature controller; further comprising,
the drum,
Control method characterized by rotating at the first threshold speed while setting and maintaining the third threshold temperature ◈Claim 20 was abandoned when the registration fee was paid.◈ According to claim 19,
before the internal temperature of the drum is set to the third critical temperature, discharging the additive contained in the drum to the outside through a drainage unit;
A control method characterized in that it further comprises.

Images