KR102446190B1 - Method for controlling laundry treating apparatus - Google Patents

Abstract

The present invention includes a first washing tub rotated about a vertical axis and a second washing tub detachably coupled to the first washing tub, and the first washing tub and the second washing tub are provided by a driving unit that rotates the first washing tub. A method of controlling a laundry treatment device in which a washing tub is integrally rotated, comprising: (a) selecting one of general washing and simultaneous washing; rotating the driving unit; In step (b) of detecting (c) determining the amount of laundry based on a value obtained by subtracting a preset correction value from the detected characteristic value, and setting the water supply level according to a preset standard based on the amount of laundry determined in step (c) and (d) supplying water into the first washing tub up to the set water supply level.

Description

Control method of laundry treatment equipment {METHOD FOR CONTROLLING LAUNDRY TREATING APPARATUS}

The present invention relates to a control method of a laundry treatment device having a second washing tub detachably installed in a first washing tub.

A laundry treatment device is a device for processing laundry through various actions such as washing, dehydration and/or drying. Laundry processing equipment uses water and detergent to remove contamination from laundry (hereinafter, also referred to as “cloth”) and rotates a drum in which wet laundry is placed at high speed. There are a dryer for drying the laundry by supplying dry air into the inserted drum, and a washing machine for drying with both a drying function and a washing function.

Recently, a washing machine equipped with two washing tubs has been provided. Such a washing machine has a large capacity washing tub and a small capacity washing tub, and each washing tub is separated from each other. Such a washing machine is convenient because each washing tub can be used at the same time or at the same time according to the user's needs, and furthermore, when a small amount of washing is required, only a washing tub of a small capacity can be used, so it is very economical. However, in this conventional washing machine, since the two washing tubs are separated, the overall size of the product is inevitably increased due to the spaces accommodating the washing tubs, respectively, driving units for driving the washing tubs, and water supply for water supply Since two devices and two drainage devices for drainage are required, there is a problem that the price of the product also increases.

An object of the present invention is to provide a method for controlling a laundry treatment apparatus including a first washing tub and a second washing tub that is detachably installed on the upper portion of the first washing tub and rotates integrally with the first washing tub. , in particular, to provide a control method capable of accurately detecting the amount of laundry put into the first washing tub in a state in which the second washing tub is installed (hereinafter, referred to as “lather weight”).

In addition, even if the standard of the water supply level predetermined according to the amount of laundry is applied not only to the general washing performed when the second washing tub is separated, but also to the simultaneous washing performed when the second washing tub is installed, the first washing tub An object of the present invention is to provide a method for controlling a laundry treatment device capable of supplying an appropriate amount of water.

The present invention includes a first washing tub rotated about a vertical axis and a second washing tub detachably coupled to the first washing tub, and the first washing tub and the first washing tub are driven by a driving unit that rotates the first washing tub. 2 It relates to a control method of a laundry treatment device in which the washing tub is rotated integrally.

The control method includes a step (a) of selecting one of general washing and simultaneous washing, rotating the driving unit, and sensing a characteristic value (driver output current/electromotive force) that varies according to a load acting on the driving unit ( When the general washing is selected in step b) and step (a), the amount of laundry is determined based on the characteristic value detected in step (b), and when the simultaneous washing is selected in step (b), (c) determining the amount of laundry based on a value obtained by subtracting a preset correction value from the detected characteristic value; and (d) supplying water into the first washing tub up to the water supply level.

In the control method of the laundry treatment apparatus of the present invention, even in the case of simultaneous washing performed in a state in which the second washing tub is installed in the first washing tub, the influence due to the load acting on the driving unit from the second washing tub is excluded, and It has the effect of accurately detecting the amount of laundry in the washing tub.

In addition, it is easy to control the water supply because the standard of the water supply level predetermined according to the amount of laundry can be applied not only to the general washing performed when the second washing tub is separated, but also to the simultaneous washing performed when the second washing tub is installed. Also in this case, when water is supplied to the first washing tub, there is an effect that an appropriate amount of water can be supplied corresponding to the amount of laundry put into the first washing tub.

In addition, when simultaneous washing is performed in a state in which the first washing tub is empty and the cloth is inserted in the second washing tub, it is possible to prevent unnecessary water supply to the first washing tub.

1 is a side cross-sectional view of a laundry treatment apparatus according to an embodiment of the present invention.
2 is a perspective view of a second washing tub;
3 illustrates a state in which the second washing tub is disassembled.
4 is a block diagram illustrating a control relationship between main components of a laundry treatment apparatus according to an embodiment of the present invention.
5 is a view from above of a state in which the second washing tub is installed on the balancer.
6 is a flowchart illustrating a control method of a laundry treatment apparatus according to an embodiment of the present invention.
7 is a graph showing the detected laundry amount according to the amount of water supplied to the second washing tub (a) and the corrected value of the laundry amount (b).

1 is a side cross-sectional view of a laundry treatment apparatus according to an embodiment of the present invention. 2 is a perspective view of a second washing tub; 3 illustrates a state in which the second washing tub is disassembled. 4 is a block diagram illustrating a control relationship between main components of a laundry treatment apparatus according to an embodiment of the present invention. 5 is a view from above of a state in which the second washing tub is installed on the balancer.

1 to 5 , the cabinet 2 forms the exterior of the laundry treatment device, and forms a space in which the water storage tank 4 is accommodated. The cabinet 2 is supported by a flat cabinet base 5 , the upper surface of which is open, and may include a front side, a left side, a right side, and a rear side.

A top cover 3 may be coupled to the open upper end of the cabinet 2 . The top cover 3 may have an inlet for putting in and taking out laundry (or "cloth"). A door (not shown) for opening and closing the inlet may be rotatably coupled to the top cover 3 .

The water storage tank 4 is to contain wash water, and may be suspended in the cabinet 2 by the support rod 15 . The support rod 15 may be provided at each of four corners of the cabinet 2 , and one end of each support rod 15 is pivotably connected to the top cover 3 , and the other end is a suspension for damping vibrations. (27) is connected to the water storage tank (4).

The water storage tank 4 has an opened upper surface, and a water storage tank cover 14 may be provided on the opened upper surface. The water storage tub cover 14 is formed in a ring shape with a substantially circular opening in the center, and laundry is put in through the opening.

A first washing tub 6 that accommodates laundry and rotates about a vertical axis O (refer to FIG. 5 ) may be disposed in the water storage tub 4 . The vertical axis is substantially perpendicular to the ground, and may be precisely aligned on a vertical line with the ground, but is not limited thereto, and may be inclined at a predetermined angle (preferably, 5 degrees or less) with respect to the vertical line. A plurality of through holes through which water passes may be formed in the first washing tub 6 , and water may be exchanged between the first washing tub 6 and the water storage tub 4 through the through holes.

The first washing tub 6 may include a drum 61 having an open upper side, and a ring-shaped balancer 62 coupled to the upper portion of the drum 61 . The lower side of the drum 61 may be connected to the rotation shaft of the driving unit 8 by a hub 29 . The through hole may be formed in the drum 61 .

The balancer 62 compensates for the eccentricity induced when the drum 61 rotates. An annular cavity (not shown) may be formed inside the balancer 62 . A fluid (eg, brine) or a plurality of weights (eg, metal spheres) may be inserted into the cavity. The annular cavities 62a and 62b have different diameters, but a plurality may be formed to have concentricity.

If the drum 61 is tilted to one side while being rotated, the eccentricity is corrected by moving the fluid or weight in the opposite direction to the direction in which the drum 61 is tilted. The ring-type balancer 62 applied to the laundry treatment device has already been known in various forms, and further description will be omitted.

A second washing tub 100 detachable from the first washing tub 6 is provided. The second washing tub 100 accommodates laundry and is detachably coupled to the first washing tub 6 . When the first washing tub 6 is rotated while the second washing tub 100 is installed, the second washing tub 100 is also rotated integrally with the first washing tub 6 .

If necessary, the user puts the first laundry into only the first washing tub 6 in the state where the second washing tub 100 is not installed, or installs the second washing tub 100 and puts the first laundry into the second washing tub 100 . 2 Laundry can be put in.

A pulsator 9 may be rotatably provided at an inner lower portion of the first washing tub 6 . The pulsator 9 may include a plurality of radial ribs protruding upward. When the pulsator 9 is rotated, a water flow may be formed by the ribs.

A driving unit 8 providing power for rotating the first washing tub 6 and the pulsator 9 may be disposed in the cabinet 2 . The driving unit 8 may be disposed below the water storage tank 4 , and may be provided in the form of being suspended in the cabinet 2 together with the water storage tank 4 . The rotating shaft of the driving unit 8 is always coupled to the pulsator 9 , and may be coupled or disconnected from the first washing tub 6 according to a switching operation of a clutch (not shown). Accordingly, when the driving unit 8 is operated with the rotating shaft of the driving unit 8 coupled to the first washing tub 6, the pulsator 9 and the first washing tub 6 rotate integrally, and the When the rotating shaft operates in a state separated from the first washing tub 6 , only the pulsator 9 rotates while the first washing tub 6 is stopped.

The driving unit 8 may include a washing motor capable of speed control. The washing motor may be a direct drive type inverter motor (Inverter Direct Drive Motor). The controller 91 may include a proportional-integral controller (PI controller), a proportional-integral-derivative controller (PID controller), and the like. The controller receives an output value (eg, output current) of the washing motor as an input, and based on this, the number of rotations (or rotation speed) of the washing motor follows a preset target rotation speed (or target rotation speed). can be controlled

The control unit 91 may control not only the washing motor but also the overall operation of the laundry treatment device, and it will be understood that the control of each configuration mentioned below is performed by the control of the control unit 91 .

Meanwhile, the laundry treatment device may include at least one water supply pipe 11 for guiding water supplied from an external water source such as a faucet. The at least one water supply pipe 11 may include a cold water pipe (not shown) receiving cold water from an external water source and a hot water pipe (not shown) receiving hot water.

A water supply unit 13 for supplying water supplied from an external water source to the first washing tub 6 and/or the second washing tub 100 may be provided. The water supply unit 13 may selectively control the at least one water supply pipe 11 . To this end, the water supply unit 13 may include at least one water supply valve. When the at least one water supply valve is opened under the control of the controller 91 , water is supplied to the dispenser 16 through a water supply pipe corresponding to the opened water supply valve.

A water level sensor (not shown) for detecting the water level in the first washing tub 6 may be provided. The control unit 91 may control the amount of water supplied through the water supply unit 13 based on the detected value of the water level sensor.

The dispenser 16 supplies the additive acting on the laundry together with the water supplied through the water supply pipe 11 . Additives supplied by the dispenser 16 include laundry detergent and fabric softener for rinsing.

The second washing tub 100 may be inserted into a space (or a substantially circular opening) defined by the ring-shaped balancer 62 , and may be supported by the balancer 62 in the inserted state. Concave-convex 114 extending obliquely in the vertical direction may be formed on the outer peripheral surface of the second washing tub 100 .

The balancer 62 may be provided with a fixing groove 62d corresponding to the unevenness 114 on the inner circumferential surface defining the central opening. The unevenness 114 is inserted along the fixing groove 62d, so that when the first washing tub 6 is rotated, the second washing tub 100 does not rotate in vain and rotates integrally with the first washing tub 6 can

Referring to FIG. 5 , when viewed from above, the outer appearance of the second washing tub 100 includes a first section S1 in contact with the inner circumferential surface of the balancer 62 (or the face defining the central opening), and the balancer It may include a second section (S2) spaced apart from the inner peripheral surface of (62).

The first section S1 is located on the first axis IV-IV passing through the vertical axis O, and the second section S2 is the second section S2 passing through the vertical axis O and perpendicular to the first axis IV-IV. It may be located on the 2 axis (Y). The first section S1 may be formed on both sides symmetrically with respect to the second axis Y, and the second section S2 may be formed on both sides symmetrically with respect to the first axis IV-IV, respectively. have.

When the first washing tub 6 (or the second washing tub 100) is in the first rotational position, the water discharged from the water supply 13 is controlled by the driving unit 8 by the control unit 91, It may be supplied to the first washing tub 6 through a gap formed between the second section S2 and the inner circumferential surface of the balancer 62 .

When the first washing tub 6 is in the second rotational position rotated by a predetermined angle from the first rotational position under the control of the driving unit 8 by the controller 91, the water discharged from the water supply unit 13 is Water is supplied to the second washing tub 100 . The second washing tub 100 may have an inlet 137 through which water discharged from the water supply unit 13 is introduced, and in the second rotational position, the inlet 137 is aligned with the water supply unit 13 . . The inlet 137 may be disposed on both sides of the second washing tub 100 (137(1) and 137(2) indicate both inlets), preferably, with respect to the second axis Y. To be symmetrical, it may be arranged along the first axis IV-IV.

The second rotational position may be a position in which the first washing tub 6 is rotated 90 degrees from the first rotational position. As described above, since the washing motor is capable of speed control, the controller 91 controls the rotation angle of the first washing tub 6 or the rotational position of the first washing tub 6 based on the speed of the washing motor. It is possible to control

Specifically, a first hall sensor (not shown) may be provided on the water storage tub cover 14 , and a first magnet may be provided on the second washing tub 100 . While the second washing tub 100 is being rotated, the first Hall sensor may be configured to detect a magnetic field formed by the first magnet, and send a signal to the control unit 91 based on this. Based on the received signal, the control unit 91 may determine the rotation speed, rotation position (or position of the first magnet), rotation angle, etc. of the second washing tub 100, and based on this, the first washing tub 6 (6) ) may control the washing motor to be aligned with the first rotational position or the second rotational position.

On the other hand, a second magnet may be further provided in the rotor of the washing motor, and a second Hall sensor for sensing a magnetic field generated by the second magnet may be disposed in a fixed structure near the second magnet (eg, For example, the bottom of the water tank (4)). A plurality of the second magnets may be disposed along the circumference of the rotor. The control unit 91 may control the washing motor based on the signal output from the second Hall sensor. At this time, by considering the signal output from the above-described first Hall sensor together, the second washing tub 100 ) can be controlled to be aligned with the first rotational position or the second rotational position.

Meanwhile, according to an embodiment, the rotation angle of the rotor may be detected without a separate sensor. That is, the rotation angle of the rotor may be detected in a sensorless manner without a sensor. In this sensorless method, after a phase current of a constant frequency flows through the washing motor, the position of the rotor of the washing motor may be estimated based on an output current detected while the current of a constant frequency flows through the washing motor. Since such a sensorless method corresponds to a known technology, a detailed description thereof will be omitted.

The second washing tub 100 may include a container 110 , a first cover 120 , and a second cover 130 . The container 110 contains laundry and water, and has an open upper side, and the first cover 120 is coupled to the opened upper side. The first cover 120 may be coupled to an upper end of the container 110 . The first cover 120 and the container 110 are each made of a synthetic resin material, and are preferably bonded to each other by welding, more preferably by thermal welding, but is not necessarily limited thereto.

A guide rib 126 protruding from the inner surface of the container 110 and extending in the vertical direction may be provided. After the water flow generated by the rotation of the second washing tub 100 rises by collision with the guide rib 126 , it may fall to the center of the container 110 . Concave-convex 114 may be formed on the outer surface of the container 110 . The container 110 may be made of a transparent material so that the laundry accommodated therein is visible from the outside.

The first cover 120 has an opening 121h in the center of the first cover 120 so that laundry can be put into the container 110 , and provides a space in which the detergent box 140 ( FIG. 5 ) is accommodated. The detergent box 140 may be detachably attached to the first cover 120 . The detergent box 140 may be provided on both sides of the first cover 120 , respectively.

When the second washing tub 100 is rotated, the water flow developed outward in the radial direction by centrifugal force in the container 110 rises along the inner surface of the container 110 . In the first cover 120 , a flow path for guiding the elevated water flow to the outlet 124 may be formed. The control unit 91 may control the speed of the second washing tub 100 (or the speed of the driving unit 8 ) so that the water in the container 110 is discharged through the outlet 124 , and in this case, the outlet 124 . The water discharged through the is collected in the water storage tank (4). This process may be performed when the water used for washing is drained after washing the laundry in the second washing tub 100 .

Meanwhile, although not shown, a check valve for controlling the flow path may be further provided, and the check valve may be opened and closed by centrifugal force caused by the rotation of the second washing tub 100 or configured to be opened and closed by water pressure. can

The second cover 130 is detachably coupled to the first cover 120 , and an opening 131 is formed at approximately the center thereof. The second cover 130 includes a water supply guide 133 for guiding the water discharged from the water supply unit 13 to the detergent box 140 . The water supply guide 133 forms an inclined surface so that the water discharged from the water supply unit 13 is guided downward, and the water guided along the inclined surface is supplied to the detergent box 140 through the water supply port 141 . The water supply guide 133 may be provided on both sides of the first cover 120 , respectively. Both water supply guides 133(1), 133(2) may be arranged along the first axis IV-IV, preferably to be symmetrical with respect to the second axis Y.

The detergent box 140 is for containing detergent, bleach or fabric softener, and water discharged from the water supply unit 13 passes through the detergent box 140 , and is supplied into the second washing tub 100 together with the detergent.

A housing 128 in which the detergent box 140 is accommodated may be formed in the first cover 120 , and the detergent box 140 may be removably coupled to the housing 128 .

The detergent box 140 may be provided on both sides of the second cover 130 , respectively. The detergent box 140 may be disposed at positions corresponding to the pair of inlets 137(1) and 137(2), respectively. A detergent or bleach may be added to the first detergent box 140(1), and a fabric softener may be added to the second detergent box 140(2). Depending on the rotational position of the second washing tub 100, water discharged from the water supply unit 13 may be selectively supplied to the first detergent box 140(1) or the second detergent box 140(2). . For example, the control unit 91 controls water to be supplied to the first detergent box 140(1) during the washing cycle and to the second detergent box 140(2) during the rinsing cycle. The rotation position of the second washing tub 100 may be controlled.

The laundry treatment apparatus may further include a drain bellows 21 for discharging water from the water storage tank 4 , and a drain valve 22 for controlling the drain bellows 21 . The drain bellows 21 may be connected to the pump 24 . When the drain valve 22 is opened, water may be supplied to the pump 24 through the drain bellows 21 . The water introduced into the pump 24 is discharged to the outside of the laundry treatment machine through the drain pipe 25 when the pump 24 is operated.

The amount of laundry may be obtained based on a characteristic value that varies according to the load of the driving unit 8 . For example, as more fabric is put into the first washing tub 6 and/or the second washing tub 100, when the driving unit 8 is rotated at a preset target speed, the When the electromotive force increases, the electromotive force can be detected, and the amount of laundry can be calculated based on the electromotive force.

Alternatively, when the driving unit 8 in a stationary state is rotated, as the amount of laundry increases, the stopping inertia of the first washing tub 6 and the second washing tub 100 is large, so that the driving unit 8 reaches a preset target speed. It takes more time to do it. Accordingly, the amount of laundry can be determined based on the time it takes for the driving unit 8 to reach the target speed.

As another example, the amount of laundry may be determined based on the time it takes to stop the rotating driving unit 8 by braking. In this case, the rotation of the first washing tub 6 and the second washing tub 100 varies depending on the laundry amount using inertia.

In addition, a method for calculating the laundry weight is already well known in the art, and the controller 91 may calculate the laundry weight based on these known techniques.

6 is a flowchart illustrating a control method of a laundry treatment apparatus according to an embodiment of the present invention. 7 is a graph showing the detected laundry amount according to the amount of water supplied to the second washing tub (a) and the corrected value of the laundry amount (b). Hereinafter, a method for controlling a laundry treatment device according to an embodiment of the present invention will be described with reference to FIGS. 6 to 7 .

Step S1 is a step of receiving a washing course selection input from the user. The laundry treatment device may be provided with an input unit 92 such as a button, a dial, and a touch panel so that a user can select the washing course. Selectable laundry courses include general laundry and simultaneous laundry. The user may select the general washing or simultaneous washing by operating the input unit 92 . Here, the general washing is a course selected by the user when washing is performed in a state where the second washing tub 100 is not installed, and the simultaneous washing is selected by the user when the second washing tub 100 is installed. It is a course that

In step S2, the driving unit 8 is rotated to detect the amount of laundry, and in this process, characteristic values (eg, output current of the driving unit 8, counter electromotive force, etc.) that vary according to the load applied to the driving unit 8 are detected. is a step to be The characteristic value may be detected in a circuit to which the driving unit 8 is connected, and for this purpose, a voltage detector or a current detector may be provided.

Step S3 is a step of calculating the amount of laundry, and the amount of laundry is determined based on the characteristic value detected in step S2. The determined laundry amount is stored in the memory 94 . The memory 94 stores various data necessary for control of the laundry processing device. These data are coded and stored in a form readable by the controller 91 . The data may include, for example, an operation execution program, various operation settings such as a water supply level according to the amount of laundry, a dehydration speed, and an operation time.

Step S4 is a step in which the control unit 91 determines which washing course is selected in step S2. If the simultaneous washing course is selected in step S2, step S6 is performed, and in the opposite case, step S5 is performed. In the embodiment, when simultaneous washing is not selected in step S2 , general washing is automatically selected, but the present invention is not limited thereto, and general washing may be selected through the input unit 92 .

In step S5, the water supply level is set according to the amount of cloth determined in step S3. The controller 91 may compare the amount of laundry detected in step S3 with the water level according to the amount of laundry stored in the memory 94 to determine a water supply level corresponding to the detected amount of laundry. In addition, the controller 91 may control the water supply unit 13 to supply water, and when the water level in the first washing tub 6 reaches the determined water supply level by the water level sensor, water is supplied through the water supply unit 13 . can be controlled to stop. Thereafter, the controller 91 may control washing, rinsing, dehydration, etc. to be performed according to a preset algorithm.

Meanwhile, when simultaneous washing is selected in step S2 and step S6 is performed, the control unit 91 may correct the laundry amount calculated in step S3. The reason that this correction is necessary is that, in the case of simultaneous washing, the detected amount of fabric is not only the weight of the first washing tub 6 and the fabrics contained therein, but also the weight of the second washing tub 100 and the weight of the clothes contained in the second washing tub 100 . Since the weight of the cloths is also included, when the water supply level is determined based on the amount of cloth calculated in step S3, a larger amount of water is supplied than the water required for the treatment of the actual cloths put into the first washing tub 6 This is because more water is required, and accordingly, there is a problem in that more electricity is consumed even in the washing, rinsing, or dehydration operations performed after water supply.

For this reason, in step S6, the laundry amount (x) calculated in step S3 is corrected, and this process is performed by subtracting the preset correction value (y) from the laundry weight (x). That is, the amount of laundry (z) corrected in step S6 may be expressed by the following equation.

z=x-y, z = adjusted laundry weight, x = laundry weight obtained in step S3, y = corrected value

Here, the correction value y may be set to correspond to the weight of the second washing tub 100 . That is, the controller 91 may determine the corrected laundry amount z by subtracting the laundry amount value y corresponding to the weight of the second washing tub 100 from the laundry weight x.

Alternatively, the correction value y may be set to correspond to the sum of the weight of the second washing tub 100 and half of the maximum allowable load M that can be accommodated in the second washing tub 100 . The maximum allowable load (M) is set to secure the durability of the laundry treatment device and prevent safety accidents, and is the maximum load that the second washing tub 100 can put in within the range in which the normal operation of the laundry treatment machine is guaranteed, This is generally a value announced by the manufacturer of the laundry treatment device through the product manual.

The values indicated in the area (a) of FIG. 7 are laundry amounts measured while varying the load applied to the second washing tub 100 in a state in which no laundry is put into the first washing tub 6 . In the graph, the X-axis is the input load (m, the load put into the second washing tub 100) with respect to the maximum allowable load (M), which is hereinafter referred to as “load ratio”. Further, WL1 is the amount of cloth serving as a reference for the first water supply level. According to the water supply level according to the amount of laundry stored in the memory 94, when the amount of laundry is less than WL1, no water is supplied to the first washing tub 6 and the cloth When the amount is greater than or equal to WL1 and less than WL2, the first water supply level is set by the control unit 91, and when the amount is greater than or equal to WL2 and WL3 (a value greater than WL2), the second water level is set. .

Since the amount of laundry displayed in the area (a) (these are the values determined in step S3) are values detected while changing only the amount of laundry put into the second washing tub 100 while no cloth is put into the first washing tub 6, , At this time, the amount of laundry must be less than WL1 to prevent unnecessary water from being supplied to the first washing tub 6. Therefore, when the water supply level is set without correcting the laundry amount, water is supplied up to the first water supply level even though the first washing tub 6 is empty.

Therefore, in order to solve this problem, the amount of laundry is corrected in step S6, and the corrected amount of laundry is displayed in the area (b) of FIG. Therefore, when the water supply level is set according to the corrected amount of laundry, water is not supplied to the first washing tub 6, so that unnecessary water is not supplied.

The corrected value y is the amount of laundry corresponding to the preset minimum water supply level when the first washing tub 6 is empty and an arbitrary load less than the maximum allowable load is input into the second washing tub 100 . It is preferably set to be less than (WL1).

On the other hand, since the second washing tub 100 has a relatively small capacity compared to the first washing tub 6, it is not necessary to control the water supply according to the water supply level. For example, a preset amount of water is supplied to the second washing tub 100 ) can be supplied. The water supply to the second washing tub 100 is provided with a flow meter that controls the water supply time by the water supply unit 13 or, according to an embodiment, detects the flow rate supplied through the water supply unit 13, the detection of the flow meter Based on the value, the amount of water supplied can be controlled.

Meanwhile, when the simultaneous washing is selected, if the amount of laundry determined in step S6 is equal to or greater than a preset reference value, a predetermined message may be output through the output unit 93 . In the case of simultaneous washing, when more than a certain amount of laundry is put into the first washing tub 6 , the laundry may interfere with the second washing tub 100 . Accordingly, the reference value is set within the range in which the laundry put into the first washing tub 6 does not interfere with the second washing tub 100. If the amount of laundry corrected in step S6 is equal to or greater than the reference value, the output unit 93 is By outputting a predetermined message through the system, the user is warned that excessive laundry has been put into the first washing tub 6 . The output unit 93 may include a visual display (eg, LCD, LED) and/or an audible display (eg, buzzer, speaker).

Meanwhile, the laundry treatment device may further include a communication unit 95 connected to a wireless network. In this case, if the amount of laundry corrected in step S6 is equal to or greater than the reference value, the control unit 91 may control to transmit a notification signal through the communication unit 95 . A user's mobile terminal (not shown, for example, a smart phone) may be connected to the wireless network, and in this case, a notification corresponding to the notification signal may be output through the mobile terminal.

Claims (10)

a first washing tub having an opening on the upper side and rotating about a vertical axis;
a driving unit configured to rotate the first washing tub;
a second washing tub detachably coupled to the first washing tub and rotating integrally with the first washing tub;
a water supply unit configured to selectively supply water to the first washing tub or the second washing tub; and
a control unit for controlling the water supply unit based on the load of the driving unit sensed when rotating or stopping the first washing tub;
The control unit is:
calculating a first laundry amount based on the load of the driving unit sensed when rotating or stopping the first washing tub;
calculating a corrected second laundry weight by subtracting a correction value corresponding to the weight of the second washing tub from the first laundry weight;
When the second laundry amount is less than a preset reference laundry weight WL1, the laundry treatment device supplies only the second laundry tub among the first and second laundry tubs through the water supply unit.
The method of claim 1,
The control unit supplies water to the first washing tub and the second washing tub through the water supply unit when the second laundry amount is equal to or greater than the reference laundry weight WL1.
The method of claim 1,
The correction value is
A laundry treatment device set to correspond to the sum of the weight of the second washing tub and half of the maximum allowable load that can be accommodated in the second washing tub.
The method of claim 1,
The correction value is
A laundry treatment device set to correspond to the sum of the weight of the second washing tub and the maximum allowable load that can be accommodated in the second washing tub.
The method of claim 1,
and an output unit for outputting a predetermined message when the second laundry amount is greater than or equal to a preset reference value.
The method of claim 1,
Further comprising a communication unit connected to the wireless network,
The control unit transmits a notification signal through the communication unit when the second laundry amount is equal to or greater than a preset reference value.
The method of claim 1,
The control unit supplies a preset amount of water to the second washing tub through the water supply unit when the second laundry amount is less than the reference laundry weight WL1.
3. The method of claim 2,
When the second laundry amount is equal to or greater than the reference laundry weight WL1, the control unit supplies water up to a water supply level set according to the second laundry amount to the first washing tub and supplies a preset amount of water to the second laundry tub. .
3. The method of claim 2,
The first washing tub includes:
a drum with an open upper side; and
and a ring-shaped balancer coupled to the upper portion of the drum and having an inner circumferential surface defining the opening of the first washing tub,
The second washing tub has an outer shape including a first section contacting the inner circumferential surface of the balancer and a second section spaced apart from the inner circumferential surface of the balancer, and includes an inlet extending along the first section,
When the second laundry weight is less than the reference laundry weight WL1, the controller controls the driving unit to align the water supply unit with the first section of the second washing tub, and supplies water to the second washing tub through the water supply unit. .
10. The method of claim 9,
When the second laundry amount is equal to or greater than the reference laundry weight WL1, the controller controls the driving unit to align the second section of the second washing tub with the water supply unit, and supplies water to the first washing tub through the water supply unit. .

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