KR20230061231A - Laundry treatment APPARATUS and control method thereof - Google Patents

Abstract

Based on the value measured by the vibration sensor and the measured value of the current flowing through the motor, it is possible to detect whether or not the drum is filled with water. A technique for controlling a laundry treatment apparatus to perform a spin-drying operation is disclosed.

Description

Laundry treatment apparatus and control method thereof {Laundry treatment APPARATUS and control method thereof}

In order to prevent deterioration of the dehydration effect due to water being introduced into the drum during the first dehydration operation, the water inside the drum is filled based on a value measured using an existing sensor during the first dehydration operation. The present invention relates to a technology related to control of a laundry treatment apparatus for improving a dehydration effect by detecting whether the laundry is in a state and discharging water inside the drum and then executing a second spin-drying operation.

In general, a laundry treatment device uses water, detergent, and mechanical action to remove stains on clothes, bedding, etc. (hereinafter referred to as 'laundry') through a process of washing, rinsing, and spin-drying. It is a device.

Here, the washing process is a process of washing laundry by supplying water and detergent, the rinsing process is a process of supplying water after washing to remove contaminants and residual detergent separated from the laundry, and the spin-drying process is a process of A process of removing moisture from the laundry while rotating at the fastest speed may be included.

As the capacity of the drum increases, the distance between the drum and the tub decreases, and when operated according to the conventional dehydration process, water is introduced into the drum again, resulting in a deterioration in the dehydration effect.

Regarding the spin-drying stroke control method of the washing machine, prior art 1 (Korean Patent Publication No. 10-2018-0029333) detects the amount of eccentricity according to the eccentric distribution of the laundry and evenly distributes the laundry to perform the spin-drying step while requiring dehydration. It discloses a technique for controlling the time to be.

In addition, prior art 2 (Korean Laid-open Patent Publication No. 10-2021-0053507) detects the drainage capacity of the laundry to solve the problem that the water of the laundry accumulates in the lower part of the tub and overloads the motor during the spin-drying operation, Disclosed is a technology for a dehydration control method for setting a water quantity.

However, even according to the prior art, as the capacity of the drum increases, it is not possible to solve the problem of filling the inside of the drum by the conventional dehydration operation.

The embodiment of the present specification is proposed to solve the above-described problems, and even if water flows into the drum during the first dehydration operation due to the narrowing of the distance between the drum and the tub due to the increase in drum capacity, this is detected and the second dehydration operation is performed. The purpose is to improve the dehydration effect through.

Specifically, without the installation of additional sensors, it is possible to detect the state in which the drum is filled with water during the first spin-drying operation through a sensor that measures the current flowing in the existing vibration sensor and motor, thereby cost-effectively improving the spin-drying effect. can

More specifically, the drum during the first dewatering operation is based on the value measured by the vibration sensor pre-installed during the rotation of the first RPM during the first dewatering operation according to the improvement of the internal algorithm and the current value flowing to the motor when the second RPM is rotated. Cost can be saved because it is possible to execute the second spin-drying operation by determining whether water has been introduced into the inside again.

In this case, in the process of controlling the reference RPM to the second RPM during the second spin-drying operation, the RPM may be controlled at different accelerations to manage noise of the laundry treatment apparatus.

In addition, when it is detected that the water is not full during the first spin-drying operation, the first spin-drying operation is terminated without the second spin-drying operation, so that the spin-drying operation can be controlled in a timely manner.

The technical problem to be achieved by the present embodiment is not limited to the technical problems described above, and other technical problems may be inferred from the following embodiments.

According to the first embodiment of the present specification, detecting the amount of laundry inside the drum; Checking whether an unbalance is within an allowable range during a first spin-drying operation; checking a first value measured by a vibration sensor when the motor rotates at a first RPM when the degree of imbalance is within an allowable range; checking a second value obtained by measuring a current flowing through the motor when the motor rotates at a second RPM after the first RPM; and detecting whether or not the inside of the drum is filled with water based on the first value and the second value.

Specifically, the step of detecting whether or not the water inside the drum is filled based on the first value and the second value is when at least one of the first value and the second value satisfies a predetermined condition. If so, detecting that the inside of the drum is filled with water; and controlling RPM of the motor to perform a second spin-drying operation.

More specifically, the step of controlling the RPM of the motor to perform the second spin-drying operation may include controlling the maximum RPM of the motor to a reference RPM; and controlling a valve at the bottom of the drum to be open to discharge water inside the drum while controlling the motor to the reference RPM.

In addition, controlling the RPM of the motor based on different accelerations during a time period during which the control RPM is controlled from the reference RPM to the second RPM after controlling the valve to a close state; and controlling the RPM of the motor from the second RPM to the maximum RPM.

Here, the reference RPM may be characterized in that the RPM smaller than the first RPM.

In addition, the maximum RPM may be characterized in that the RPM greater than the second RPM.

Specifically, detecting that the inside of the drum is filled with water may include sensing that the inside of the drum is filled with water when the first value measured at the first RPM corresponds to a reference value or more. can

Specifically, the step of detecting a state in which the inside of the drum is filled with water includes detecting a state in which the inside of the drum is filled with water when the second value measured at the second RPM corresponds to a preset range. can include

In the step of detecting whether or not the water inside the drum is full, the first spin-drying operation is performed when the water inside the drum is detected based on the first value and the second value. It may include a step of controlling to end.

In addition, the step of checking whether the unbalance is within the allowable range during the first spin-drying operation may include stopping the RPM of the motor when the unbalance is not within the allowable range; and adjusting the condition of the laundry inside the drum so that the degree of imbalance corresponds within the allowable range.

Details of other embodiments are included in the detailed description and drawings.

The laundry treatment apparatus according to the proposed embodiment can expect one or more of the following effects.

The laundry treatment apparatus according to an embodiment of the present specification has an advantage in that a dehydration effect can be improved through a second dehydration operation even when water flows into the drum due to an increase in drum capacity. Therefore, even if the drum capacity increases according to the trend these days, since the already installed sensor can be used, there is an advantage in maintaining the dehydration effect without additional cost.

At this time, there is an advantage in that it is possible to detect whether or not the water inside is filled during the first spin-drying operation by using a sensor that measures the current flowing in the motor and the vibration sensor that is already installed without additional cost.

If the water is not filled, there is an advantage in that the time required for dehydration can be efficiently managed by ending the first dehydration operation as before without executing the second dehydration operation.

Alternatively, when the water is full, the RPM of the motor is controlled to the reference RPM through an internal algorithm update to discharge the water inside the drum, and then the dehydration operation is executed again to maintain the dehydration effect.

The effects of the invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a laundry treatment device according to an embodiment, and FIG. 2 is a cross-sectional view of the inside of the laundry treatment device according to an embodiment.
3 is a diagram for explaining an operation process of the laundry treatment apparatus according to an embodiment.
4 is a diagram showing RPM of a motor when a first spin-drying operation is performed according to an embodiment.
5 is a diagram showing RPM of a motor when a first spin-drying operation and a second spin-drying operation are performed according to an embodiment.
6 is a diagram for explaining an effect according to a second spin-drying operation according to an exemplary embodiment.
7 is a diagram for explaining a control method of a laundry treatment apparatus according to an embodiment.

The terms used in the embodiments have been selected as general terms that are currently widely used as much as possible while considering the functions in the present disclosure, but they may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technologies, and the like. In addition, in a specific case, there are also terms arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the corresponding description. Therefore, terms used in the present disclosure should be defined based on the meaning of the term and the general content of the present disclosure, not simply the name of the term.

When it is said that a certain part "includes" a certain component throughout the specification, it means that it may further include other components without excluding other components unless otherwise stated. In addition, terms such as “~unit” and “~module” described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.

The expression of "at least one of a, b, and c" described throughout the specification means 'a alone', 'b alone', 'c alone', 'a and b', 'a and c', 'b and c' ', or 'all of a, b, and c'.

A “terminal” referred to below may be implemented as a computer or portable terminal capable of accessing a server or other terminals through a network. Here, the computer includes, for example, a laptop, desktop, laptop, etc. equipped with a web browser, and the portable terminal is, for example, a wireless communication device that ensures portability and mobility. , IMT (International Mobile Telecommunication), CDMA (Code Division Multiple Access), W-CDMA (W-Code Division Multiple Access), LTE (Long Term Evolution), etc. It may include a handheld-based wireless communication device.

Hereinafter, with reference to the accompanying drawings, embodiments of the present disclosure will be described in detail so that those skilled in the art can easily carry out the present disclosure. However, the present disclosure may be implemented in many different forms and is not limited to the embodiments described herein.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

1 is a perspective view of a laundry treatment device according to an embodiment, and FIG. 2 is a cross-sectional view of the inside of the laundry treatment device according to an embodiment.

As shown in FIG. 1, the laundry treatment apparatus includes a cabinet 2 forming an exterior, and a control panel 20 installed on one side of the cabinet 2; Inside the cabinet 2, a tub supported by a spring and oscillatingly supported by a damper, a drum 10 rotatably disposed inside the tub to accommodate laundry, and the drum 10 It may include a motor for rotating the tub, and a tub overvibration detection device for sensing overvibration of the tub. In addition, the laundry treatment device may further include various devices.

Referring to FIG. 2 in detail, as shown in FIG. 2, the laundry treatment apparatus is provided by a cabinet 2 forming an exterior, and a spring 4 and a damper 6 inside the cabinet 2. A tub 8 installed in a buffer manner and receiving wash water therein, and a plurality of water holes 10A rotatably disposed inside the tub 8 and through which the washing water passes are formed, and laundry clothes are accommodated therein A drum 10, a lifter 12 installed on an inner surface of the drum 10 and lifting the laundry to a certain height so that the laundry can fall by gravity when the drum 10 rotates, and the tub A motor 14 installed at the rear of (8) to rotate the drum 10, a cabinet cover 16 mounted at the front of the cabinet 2 and having a laundry entrance 16A in the center, A door 18 rotatably installed on the cabinet cover 16 to open and close the laundry entrance 16A, and an operation of the laundry treatment device 1 disposed above the cabinet cover 16 are displayed; In addition, a control panel 20 for controlling the operation of the laundry treatment device 1 and a plurality of hall sensors 22 installed on one side of the motor 14 to detect the RPM and rotation angle of the motor 14 composed of

Here, a top plate 24 is mounted on the upper surface of the cabinet 2, and a water supply hose 32 and a water supply valve are installed on the lower side of the top plate 24 to supply water to the inside of the tub 8 from the outside. A water supply device 30 composed of (34) is installed.

A detergent supply device 36 is installed in communication with the water supply path of the water supply device 30 so that detergent can be supplied to the tub 8 together with the water supplied by the water supply device 30 .

In addition, a drain device 40 composed of a drain hose 42 and a drain pump 44 is installed below the tub 8 to discharge wash water used for washing and rinsing to the outside.

In addition, the plurality of hall sensors 22 are sensors that generate pulse signals according to the position change of the motor 14 and measure the RPM and rotation angle of the motor 14 based on the pulse signals.

Looking at the operation of the laundry treatment apparatus according to the present invention configured as described above is as follows.

First, after the laundry is put into the drum 10 through the laundry entrance 16A of the laundry treatment device 1, the door 18 is closed so that the laundry entrance 16A is sealed, and the drum ( 10), an appropriate amount of detergent is injected into the detergent supply device 36 according to the laundry cloth.

When the laundry treatment device 1 as described above is operated, the amount of laundry cloth put into the drum 10 is detected, and washing methods such as a washing course, washing time, water supply level, and number of rinses are set according to the amount of laundry do.

In addition, the water supply valve 34 of the water supply device 30 is opened to supply water to the inside of the tub 8, and the detergent injected into the detergent supply device 36 is water supplied by the water supply device 30. It is supplied to the tub 8 in a mixed state.

When washing water is stored up to a predetermined water level inside the tub 8, the water supply valve 34 is closed, and then the drum 10 is reversed left and right by the motor 14 at the washing RPM to wash the laundry. .

At this time, the washing cloth is raised to a certain height by the drum 10 and the lifter 12 and then falls by gravity, so that contamination is removed by the dropping force of the washing cloth and the cleaning power of the detergent.

When the laundry is washed for a predetermined washing time, the drain pump 44 of the drain device 40 is driven so that the wash water in the tub 8 is discharged to the outside of the laundry treatment device 1 through the drain hose 42. is drained

When the washing cycle is completed as described above, the drum 10 is rotated by the motor 14 at a dehydration rpm to centrifugally spin the wash water contained in the laundry.

Then, the water supply valve 34 is opened, and clean water is again supplied to the inside of the tub 8 up to the set water supply level, and the drum 10 is reversed left and right at the rinse RPM by the motor 14 to achieve the set rinse During the hour, the laundry will be rinsed.

Thereafter, the drain pump 44 of the drain device 40 is driven so that the water used for rinsing is drained to the outside of the laundry treatment device 1 through the drain hose 30 . In addition, the rinsing process is repeatedly performed several times up to the set number of rinsing times.

When the rinsing cycle is completed, the drum 10 is rotated by the motor 14 at a spin rate of rpm to completely centrifugally spin water from the laundry.

At this time, as the laundry is centrifugally dehydrated, water is discharged to the tub 8 through the water hole 10A of the drum 10, and the water discharged to the tub 8 is drained by the drainage device 40. It is drained to the outside of the laundry treatment device 1.

3 is a diagram for explaining an operation process of the laundry treatment apparatus according to an embodiment.

Referring to FIG. 3 , the laundry treatment apparatus may detect the amount of laundry inside the drum to be dewatered in S301.

In addition, the laundry treatment device may check whether the degree of imbalance is within an allowable range in S303. Specifically, the laundry treatment device may check the degree of imbalance based on the values measured by the motor current and the vibration sensor, and if the degree of imbalance is out of a permissible range, the laundry treatment device stops the RPM of the motor and unfolds the laundry inside the drum. By repeating the operation, the degree of imbalance can be controlled within the allowable range. In addition, the laundry treatment apparatus may control the RPM to continue the spin-drying operation when the degree of imbalance identified based on the values measured by the motor current and the vibration sensor is within an allowable range.

The laundry treatment device may check the first value measured by the vibration sensor in S305. Specifically, the laundry treatment apparatus may check the first value measured by the vibration sensor when the motor rotates at the first RPM. The laundry treatment apparatus may check the second value obtained by measuring the current flowing through the motor in S307. Specifically, the laundry treatment apparatus may check the second value obtained by measuring the current flowing through the motor when the motor rotates at the second RPM after controlling the first RPM for a predetermined time. After controlling the second RPM for a predetermined time, the laundry treatment apparatus may control the rotation of the motor at the maximum RPM in S309.

The laundry treatment device may check whether at least one of the first value and the second value satisfies a preset condition in S311. If a preset condition is satisfied, the laundry treatment apparatus may detect that the inside of the drum is filled with water and execute a second spin-drying operation. Alternatively, when the preset condition is not satisfied, the laundry treatment apparatus may detect that the inside of the drum is not filled with water, maintain the maximum RPM for a predetermined time (S313), and then terminate the first spin-drying operation (S315). there is.

In this case, when the moving average of the first value measured by the vibration sensor at the first RPM is, for example, 1900 or more, a predetermined condition may be satisfied. Alternatively, when the second value obtained by measuring the current flowing through the motor at the second RPM is, for example, 190 or more or 0, the predetermined condition may be satisfied.

The laundry treatment apparatus may maintain the maximum RPM according to the first spin-drying operation for a predetermined time even if the preset condition is not satisfied in S317. Thereafter, the laundry treatment device may control the maximum RPM as the reference RPM in S319. At this time, when controlled at the reference RPM, the water inside the drum may be located at the bottom of the drum regardless of the centrifugal force. Therefore, by controlling the valve at the lower end of the drum to be open, the water inside the drum can be discharged to the outside.

After discharging the water inside the drum to the outside, the laundry treatment apparatus may control the maximum RPM at S321 to maintain a predetermined time, and then may end the second spin-drying operation at S323.

4 is a diagram showing RPM of a motor when a first spin-drying operation is performed according to an exemplary embodiment.

Referring to FIG. 4 , the laundry treatment apparatus may be terminated after executing a spin-drying operation once. Instead of continuously increasing the RPM of the motor, the laundry treatment apparatus may maintain the RPM at a preset RPM for a predetermined period of time and control the RPM to increase after a predetermined period of time. For example, after maintaining the first RPM for a predetermined time, the laundry treatment device may increase the RPM of the motor. Thereafter, after maintaining the second RPM for a predetermined time, the laundry treatment apparatus may increase the RPM of the motor to the maximum RPM. Then, after maintaining the maximum RPM for a predetermined time, the dehydration operation may be terminated.

5 is a diagram showing RPM of a motor when a first spin-drying operation and a second spin-drying operation are performed according to an embodiment.

Referring to FIG. 5 , the laundry treatment apparatus may control the rotation of the motor at a first RPM for a predetermined time 510 during a first spin-drying operation and then control the rotation of the motor at a second RPM for a predetermined time 520. and then control the rotation of the motor at maximum RPM.

When the water inside the drum is detected based on the first value and the second value measured when the motor rotates at the first RPM and the second RPM, the second dehydration is performed after the maximum RPM according to the first dehydration operation. action can be executed.

Specifically, the rotation of the motor may be controlled for a predetermined time 530 at the reference RPM after the maximum RPM according to the first spin-drying operation. In this case, the reference RPM is an RPM lower than the first RPM, and even when the drum rotates at the reference RPM, the water inside the drum is not affected by the centrifugal force and may correspond to the RPM located at the lower end of the drum. Therefore, while rotating at the standard RPM, the water inside the drum can be discharged to the outside by controlling the valve at the bottom of the drum to be in an OPEN state.

Thereafter, the laundry treatment apparatus may control the RPM based on different accelerations during the time section 540 in the process of controlling the reference RPM to the second RPM. Specifically, the time interval 540 may be divided into time interval 1 and time interval 2, and the laundry treatment device may use acceleration for increasing the RPM of the motor during time interval 1 and acceleration for increasing the RPM of the motor during time interval 2. They can be controlled differently. Through this, the laundry treatment device may reduce generated noise.

After maintaining the second RPM for a predetermined time, the laundry treatment apparatus may control the RPM of the motor to the maximum RPM again, and then the second spin-drying operation may be terminated.

6 is a diagram for explaining an effect according to a second spin-drying operation according to an exemplary embodiment.

Referring to FIG. 6 , graph 610 represents target RPM, graph 620 represents actual RPM, graph 630 represents D-axis motor current, and graph 640 represents Q-axis motor current.

Section 650 may correspond to the time during which the first spin-drying operation is performed, and section 660 may correspond to the time during which the second spin-drying operation is performed.

In section 650, when the first dewatering operation is performed while the drum is filled with water, a difference between the actual RPM 620 and the target RPM 610 may occur due to the water inside, and also, at the second RPM It can be seen that the motor current also has a relatively large variability during operation.

In comparison, when the water inside the drum is discharged while operating at the reference RPM in the section 660, it can be seen that the actual RPM 610 and the target RPM 620 are controlled to almost match. In addition, it can be seen that the variability of the motor current is relatively small when operating at the second RPM.

7 is a diagram for explaining a control method of a laundry treatment apparatus according to an embodiment. The detailed description of FIG. 7 may apply the above description.

Referring to FIG. 7 , in step S710, the laundry treatment device may detect the amount of laundry inside the drum. Also, in step S720, the laundry treatment apparatus may determine whether the degree of imbalance during the first spin-drying operation is within an allowable range.

Specifically, the laundry treatment device may check the degree of imbalance based on the values measured by the motor current and the vibration sensor, and if the degree of imbalance is out of a permissible range, the laundry treatment device stops the RPM of the motor and the state of the laundry inside the drum. It is possible to control the degree of imbalance within a permissible range by re-rolling the laundry by adjusting the . In addition, the laundry treatment apparatus may control the RPM to continue the spin-drying operation when the degree of imbalance identified based on the values measured by the motor current and the vibration sensor is within an allowable range.

In step S730, when the degree of imbalance is within the allowable range, the laundry treatment apparatus may check the first value measured by the vibration sensor when the motor rotates at the first RPM. Also, in step S740, the laundry treatment apparatus may check a second value obtained by measuring a current flowing through the motor when the motor rotates at a second RPM after the first RPM.

In step S750, the laundry treatment apparatus may detect whether or not the drum is filled with water based on the first value and the second value.

Specifically, when at least one of the first value and the second value satisfies a preset condition, the laundry treatment apparatus may detect that the inside of the drum is filled with water and perform a second spin-drying operation. If the predetermined condition is not satisfied, the laundry treatment apparatus may end the first spin-drying operation without performing the second spin-drying operation.

At this time, in the second dehydration operation, the motor operating at the maximum RPM according to the first dehydration operation is controlled to the reference RPM, and the valve at the bottom of the drum is controlled to be in an OPEN state to discharge water inside the drum, and then controlled again at the second RPM. And, after a certain period of time, it can be terminated after controlling to the maximum RPM again. In the process of controlling the reference RPM to the second RPM, the laundry treatment apparatus may control the RPM of the motor based on different accelerations, thereby reducing noise.

Here, the reference RPM may be an RPM smaller than the first RPM, and the maximum RPM may be an RPM greater than the second RPM. When the motor operates at the standard RPM, the water inside the drum is located at the bottom of the drum without being affected by the centrifugal force, and the water located at the bottom can be discharged to the outside by opening the valve of the drum.

When the first value measured at the first RPM corresponds to a reference value or more, the laundry treatment apparatus determines that a predetermined condition is satisfied and detects that the drum is filled with water. For example, when the moving average of the first value measured at the first RPM is 1900 or more, the laundry treatment apparatus may detect that the drum is filled with water.

In addition, when the second value measured at the second RPM corresponds to a preset range, the laundry treatment apparatus determines that a preset condition is satisfied and detects that the inside of the drum is filled with water. Specifically, the laundry treatment device is the minimum value of the D-axis current and the Q-axis current measured in the transient state of the second RPM and the maximum value of the D-axis current and the Q-axis current measured in the steady state of the second RPM. When the second value checked based on the maximum value corresponds to a preset range, it may be determined that the preset condition is satisfied. For example, when the second value measured at the second RPM is 190 or more or 0, the laundry treatment apparatus may detect that the drum is filled with water.

The laundry treatment apparatus or terminal according to the above-described embodiments includes a processor, a memory for storing and executing program data, a permanent storage unit such as a disk drive, a communication port for communicating with an external device, a touch panel, and a key ( key), user interface devices such as buttons, and the like. Methods implemented as software modules or algorithms may be stored on a computer-readable recording medium as computer-readable codes or program instructions executable on the processor. Here, the computer-readable recording medium includes magnetic storage media (e.g., read-only memory (ROM), random-access memory (RAM), floppy disk, hard disk, etc.) and optical reading media (e.g., CD-ROM) ), and DVD (Digital Versatile Disc). A computer-readable recording medium may be distributed among computer systems connected through a network, and computer-readable codes may be stored and executed in a distributed manner. The medium may be readable by a computer, stored in a memory, and executed by a processor.

This embodiment can be presented as functional block structures and various processing steps. These functional blocks may be implemented with any number of hardware or/and software components that perform specific functions. For example, an embodiment is an integrated circuit configuration such as memory, processing, logic, look-up table, etc., which can execute various functions by control of one or more microprocessors or other control devices. can employ them. Similar to components that can be implemented as software programming or software elements, the present embodiments include data structures, processes, routines, or various algorithms implemented as combinations of other programming constructs, such as C, C++, Java ( It can be implemented in a programming or scripting language such as Java), assembler, or the like. Functional aspects may be implemented in an algorithm running on one or more processors. In addition, this embodiment may employ conventional techniques for electronic environment setting, signal processing, and/or data processing. Terms such as “mechanism”, “element”, “means” and “composition” may be used broadly and are not limited to mechanical and physical components. The term may include a meaning of a series of software routines in association with a processor or the like.

The foregoing embodiments are merely examples and other embodiments may be implemented within the scope of the claims described below.

Claims (10)

detecting the amount of laundry inside the drum;
Checking whether an unbalance is within an allowable range during a first spin-drying operation;
checking a first value measured by a vibration sensor when the motor rotates at a first RPM when the degree of imbalance is within an allowable range;
checking a second value obtained by measuring a current flowing through the motor when the motor rotates at a second RPM after the first RPM; and
Based on the first value and the second value, detecting whether or not the water inside the drum is filled,
A control method of a laundry treatment device. According to claim 1,
The step of detecting whether or not the water inside the drum is filled based on the first value and the second value,
detecting that the inside of the drum is filled with water when at least one of the first value and the second value satisfies a predetermined condition; and
Including the step of controlling the RPM of the motor to perform a second dehydration operation,
A control method of a laundry treatment device. According to claim 2,
The step of performing the second dewatering operation by controlling the RPM of the motor,
controlling the maximum RPM of the motor to a reference RPM; and
Controlling the valve at the bottom of the drum in an open state to discharge water inside the drum while controlling the motor at the reference RPM,
A control method of a laundry treatment device. According to claim 3,
controlling the RPM of the motor based on different accelerations during a time interval during which the control RPM is controlled from the reference RPM to the second RPM after controlling the valve to a close state; and
Further comprising controlling the RPM of the motor from the second RPM to the maximum RPM.
A control method of a laundry treatment device. According to claim 3,
Characterized in that the reference RPM is an RPM smaller than the first RPM,
A control method of a laundry treatment device. According to claim 3,
Characterized in that the maximum RPM is an RPM greater than the second RPM,
A control method of a laundry treatment device. According to claim 2,
The step of detecting that the inside of the drum is full of water,
Including the step of detecting that the water inside the drum is filled when the first value measured at the first RPM corresponds to a reference value or more,
A control method of a laundry treatment device. According to claim 2,
The step of detecting the state that the inside of the drum is full of water,
Including the step of detecting that the water inside the drum is full when the second value measured at the second RPM corresponds to a preset range,
A control method of a laundry treatment device. According to claim 1,
The step of detecting whether the water inside the drum is filled,
Controlling to end the first spin-drying operation when it is detected that the water inside the drum is not filled based on the first value and the second value,
A control method of a laundry treatment device. According to claim 1,
The step of checking whether the unbalance is within the allowable range during the first spin-drying operation,
stopping the RPM of the motor when the degree of imbalance is not within an acceptable range; and
Adjusting the condition of the laundry inside the drum so that the degree of imbalance corresponds within the allowable range.
A control method of a laundry treatment device.

Images