KR100686110B1 - Method for controlling dehydration in washing machine - Google Patents

Abstract

An object of the present invention is to provide a dehydration stroke control method that allows the dehydration stroke to be performed smoothly without damage to foam when laundry such as a pillow floats for a predetermined height or more.

To this end, the present invention detects whether the laundry is floating while starting the rotation, performing a corresponding operation to prevent damage to the cloth and wear of the tub cover when the floating laundry is detected, and checks whether the set dehydration time has been reached. Determining whether or not the floating laundry has been detected when the dehydration time has not reached the set dehydration time, and if the floating laundry has been detected, continuing to perform a countermeasure for preventing damage to the cloth and wear of the tub cover; When the time reaches the set dehydration time is characterized in that the dehydration administration control method of the washing machine characterized in that it comprises the step of stopping the dehydration and completing the dehydration stroke.

Permeation, floating, detection, counteracting, dehydration

Description

Method for controlling dehydration in washing machine

1 is a cross-sectional view showing the structure of a conventional washing machine, the structure of the transmission washing machine

2A to 2E are reference diagrams for explaining types of problems according to the prior art,

Figure 2a is a main component diagram for explaining a problem associated with water supply

Figure 2b is a main part configuration for explaining the problems associated with the transmission washing

Figure 2c is a main component diagram for explaining a problem associated with the shower rinsing

Figure 2d is a main component diagram for explaining the problems associated with dehydration

Figure 2e is a main component diagram for explaining the problems associated with the pumping circulation type washing machine

3 is a block diagram showing an example of a washing machine structure to which a first embodiment of a laundry float detection apparatus for applying a washing machine control method of the present invention is applied;

Figure 4 is a block diagram showing a structural example of a washing machine applied to the second embodiment of the laundry float detection apparatus for applying the washing machine control method of the present invention

5 is a plan view showing a structure of a washing machine to which a third embodiment of a laundry float detection apparatus for applying a washing machine control method of the present invention is applied;

6 is a configuration diagram showing an example of a washing machine structure to which the fourth embodiment of the laundry float detection apparatus for applying the washing machine control method of the present invention is applied;

7 is a configuration diagram showing an example of a washing machine structure to which the fifth embodiment of the laundry float detection apparatus for applying the washing machine control method of the present invention is applied;

8 is a configuration diagram showing an example of a washing machine structure to which a sixth embodiment of a laundry float detection apparatus for applying a washing machine control method of the present invention is applied;

9A is a plan view showing a structure of a washing machine to which a seventh embodiment of a laundry float detection apparatus for applying a washing machine control method of the present invention is applied;

9B is a perspective view of main parts of FIG. 9A;

10 is a flowchart illustrating a dehydration stroke control process according to the dehydration stroke control method of the present invention.

Explanation of symbols on the main parts of the drawings

1: Outcase 2: Water tank

3: washing tank 5: pulsator

7: Motor 8: Tub cover

30: Lead 40: Water supply port

50a: light emitting unit 50b: light receiving unit

60: reflector 70: distance detection sensor

80: baffle 90: floating prevention

91: electrode sensor

The present invention relates to a control method of a washing machine, and more particularly, to a control method that can perform a dehydration stroke without damage in response to the laundry, such as pillows floating more than a certain height.

In general, a washing machine is a product that removes various contaminants attached to clothes, bedding, etc. by using the emulsification of the detergent and the friction action of the water flow due to the rotation of the washing blade, and the impact of the pulsator on the laundry. By detecting the amount and type of laundry, the washing method is automatically set, and the water level of the washing water is supplied to the appropriate level according to the amount and type of the laundry, and then washing is performed under the control of the microcomputer.

On the other hand, the driving method of the conventional washing machine is to transmit the rotational power of the drive motor to the washing shaft through the power transmission belt and pulley, etc. to rotate the pulsator or to the dehydration shaft to rotate the washing tank combined dehydration tank and By rotating the BLDC motor, there is a method of rotating the washing / dehydration tank for washing and dewatering at different speeds.

In addition, there is also a method of controlling the power transmission path differently while using a BLDC motor to perform washing by rotating the pulsator at low speed during washing, and dehydrating by rotating the pulsator and the dehydrating tank at the same time at the same time.

In addition, a method of performing permeation by spraying the pumped water stream into the washing tank while rotating the washing tank or the washing blade at a high speed during washing is also applied.

1 is a structural example of a conventional washing machine, which is a cross-sectional view schematically showing the structure of a permeable washing machine.

Referring to the drawings, in the conventional permeation washing machine, the reservoir 2 is supported by the plurality of supports 4 in the interior of the outer case 1, and the laundry is accommodated in the reservoir 2 and a plurality of the inner walls thereof. The washing tank 3 formed with the through hole 3a is rotatably installed by the washing shaft 6, and a pulsator 5 for forming a water flow is formed integrally with the washing tank at an inner lower end of the washing tank. A motor 7 for rotating the washing tub 3 is installed at one lower end side of the reservoir 2.

In addition, a tub cover 8 is installed at an upper end of the water storage tank 2 to inject the washing water raised between the washing tank 3 and the water storage tank into the washing tank. Is connected to the water supply line 10 for supplying the washing water to the washing tank (3) is installed, the bottom side of the water storage tank (2) is the final discharge of the wash water discharged through the through-hole (3a) of the washing tank to the outside A drain pipe 11 is installed.

In addition, the upper side of the washing tub 3 is provided with a detergent container 12 on which the detergent is automatically introduced by the washing water being supplied on the water supply line 10, and the circumferential surface of the washing tank 3 at the upper end thereof. Accordingly, a balance waiter 20 is provided to prevent vibration of the washing tank when dewatering.

The permeable washing machine configured as described above rotates the washing tub 3 and the pulsator 5 in one direction at a high speed to perform the washing stroke. In detail, as the laundry tank 3 and the pulsator 5 rotate at a high speed in one direction, the laundry is in close contact with the inner wall of the washing tank. At this time, the washing water coming out through the through hole 3a of the washing tub is tub cover 8. After passing through the laundry tank 3 again into the laundry through), the contaminants are separated while repeating this process.

On the other hand, unlike the structure illustrated above, there is also a structure in which the pulsator 5 forming the water flow is not formed integrally with the washing tank 3, but separately installed.

That is, the washing tank 3 and the pulsator 5 are separately installed so that the washing tank 3 and the pulsator 5 rotate in opposite directions at the time of washing by the rotation of the washing tank 3 (also referred to as through rotation). There is also a structure.

In addition, there is also a washing machine (see FIG. 2E) having a circulating water supply structure in which water in the washing tank 3 is pumped by the pump P and supplied again into the washing tank 3.

However, the conventional washing machine having such various structures had a disadvantage in that it does not solve the following problems in performing washing.

That is, conventional washing machines not only detect this when washing laundry including floating pillows, but also do not have an appropriate control algorithm corresponding to the floating of laundry, causing problems as follows.

First, referring to FIG. 2A, when water is supplied, for example, when a laundry such as a pillow floats in an upper portion of the washing tank 3, a phenomenon in which the rich laundry blocks the water supply flow path may prevent water supply from occurring, As the water supplied hits the floating pillow and splashes, water is introduced between the reservoir 2 and the outer case 1.

In particular, the water supply method includes a method of supplying water in a state in which the washing tank 3 is stopped, a method of supplying water while rotating the washing tank 3, and a combination of the above two methods. When the water pressure is weak, the water supply flow path is blocked, and when the water pressure is high, the water hits the floating laundry and water splashes in all directions.

In addition, when the laundry is floated in the rotary water supply, the water splashes in various directions by hitting the rotating laundry regardless of the water pressure.

Next, referring to FIG. 2B, when the laundry floats higher than the washing tub 3 during the permeation washing, the washing water penetrates the laundry and exits through the through hole 3a of the washing tub 3. In the process of being put back into the washing tank (3) through to hit the floating laundry scattered in all directions, the phenomenon that the detergent and wash water flows between the reservoir (2) and the outer case (1) occurs.

In addition, referring to FIG. 2C, when the shower rinse, the water tank 2 is rotated while supplying water, and in this case, when the laundry floats higher than the washing tank 3, the water supplied for the shower rinse hits the laundry. By being scattered, a phenomenon in which water flows in between the reservoir 2 and the outer case 1 together with the detergent occurs.

Referring to FIG. 2D, when the laundry such as a pillow floats higher than the washing tub 3 during dehydration, and the laundry tub 3 rotates at a high speed while the laundry adheres to the inner circumferential surface of the tub cover 8, foam damage is caused. Or wear occurs on the inner circumferential surface of the tub cover 8.

In addition, referring to FIG. 2E, in the pumping circulation method, the washing water in the washing tank 3 is pumped and sprayed to the washing tank 3 through the water supply port 40 or sprayed from the side surface of the washing tank 3. The water storage tank 2 is rotated while watering the water, and even in this case, when the laundry floats higher than the washing tank 3, the water circulated and resupplyed to the washing tank 3 is splashed by the laundry and scattered. Phenomenon that flows between the reservoir 2 and the outer case 1 occurs.

On the other hand, when water is introduced between the reservoir 2 and the outer case 1 due to the water splashing phenomenon due to the floating of the laundry, as described above, water enters the insulating part, causing a short, causing safety problems. If the carpet is laid on the floor, a problem occurs that damages the carpet.

In addition, if the water scattering due to the laundry is abundant during water supply, the water level is not reached to the predetermined water supply level, the water is continuously supplied or the water is made for a long time to cause a waste of water.

In addition, when the water is drained out of the reservoir 2 due to water splashing during permeation, not at the time of water supply, or the water is drained out of the reservoir 2 due to water splashing in a circulation method, the washing water is insufficient and the water is supplied again. There is also a problem that must be done.

In sum, the above-mentioned individual problems can not detect the floating of the laundry in the washing method applied to the existing washing machine and the existing washing machine, and can not provide a proper washing method for this, deteriorating washing performance due to lack of water and It causes foam damage, and there are many problems such as safety problems and water waste.

The present invention has been made to solve the above-mentioned problems, by providing a laundry float detection device of the washing machine for detecting when the laundry, such as pillows float more than a certain height, and an appropriate washing machine control method corresponding to the detection of the laundry floating In addition, the object of the present invention is to allow the washing to be performed smoothly without water splashing or foam damage caused by the floating of the laundry.

In order to achieve the above object, the present invention comprises the steps of detecting whether the laundry is floating while starting the rotation, and performing a corresponding operation for preventing cloth damage and tub cover wear when detecting the floating laundry, and at the set dehydration time Checking whether it has been reached, and determining whether or not the floating laundry has been detected when the dehydration time has not reached the set dehydration time, and if the floating laundry has been detected, continue to perform a countermeasure for preventing cloth damage and tub cover wear. Step and, if the dehydration time reaches the set dehydration time is provided washing machine control method of the washing machine comprising the step of stopping the dehydration and completing the dehydration administration.

Corresponding operation for preventing the cloth damage and the tub cover wear, characterized in that made by reducing the rotational speed of the washing tub.

Corresponding operation for preventing the cloth damage and the tub cover wear, characterized in that made by reducing the rotational speed of the washing tank and the alarm.

Corresponding operation for preventing the cloth damage and the tub cover wear, characterized in that it further comprises a dehydration stop step of stopping dehydration.

Hereinafter, the dehydration stroke control method of the present invention will be described in more detail with reference to FIG. 10.

Prior to this, with reference to Figures 3 to 9 will be described a washing machine having a laundry float detection apparatus for applying the dehydration administration control method of the present invention.

Washing machine for implementing the dehydration administration control method of the present invention, the outer case (1), the reservoir (2) provided inside the outer case (1), the tub cover (8) installed on the top of the reservoir (2) ), A washing tank (3) rotatably installed in the water storage tank (2), a driving motor (7) for rotating the washing tank (3), and a height of laundry contained in the washing tank (3). It is configured to include a detection means provided to detect when the predetermined position or more.

On the other hand, Figure 3 is a block diagram showing a structure of a washing machine applied to the first embodiment of the laundry float detection apparatus for implementing the dehydration administration control method of the present invention, the detection means according to the present embodiment, the top of the reservoir (2) The light emitting part 50a provided on one side of the installed tub cover 8 and the light receiving part 50b provided on the other side to face the light emitting part 50a are characterized in that it is made.

According to the first embodiment of the present invention configured as described above, when the laundry rises above the height at which the light emitting unit 50a and the light receiving unit 50b are installed, light emitted directly from the light emitting unit 50a to the light receiving unit 50b is blocked. Through this, it is possible to detect the floating of the laundry.

On the other hand, Figure 3 illustrates a case where the detection means consisting of the light emitting portion (50a) and the light receiving portion (50b) provided on the other side to be opposite thereto is provided on the upper surface of the tub cover (8), but is not necessarily limited thereto.

That is, the detection means may be installed on the inner circumferential surface of the tub cover 8, and the installation position thereof is not limited.

And, Figure 4 is a block diagram showing a structure of a washing machine applied to the second embodiment of the laundry float detection apparatus for implementing the dehydration administration control method of the present invention, the detection means according to the present embodiment, is installed on the top of the reservoir (2) The light emitting unit 50a provided on one side of the tub cover 8, the light receiving unit 50b provided on the other side to face the light emitting unit 50a, and installed around the light emitting unit 50a and the light receiving unit 50b. It consists of a protective baffle (80).

At this time, the protective baffle 80 is made of a transparent material so that the light transmission is possible to operate the sensor.

According to the second embodiment of the present invention configured as described above, when the laundry rises above the height at which the light emitting unit 50a and the light receiving unit 50b are installed, light emitted directly from the light emitting unit 50a to the light receiving unit 50b is blocked. In this way, it is possible to detect the floating of the laundry through the same as in the first embodiment, but the transparent protection baffle 80 is installed around the light emitting part 50a and the light receiving part 50b of the tub cover 8. As a result, the optical sensor can be more reliably protected.

Next, Figure 5 is a block diagram showing a structure of a washing machine applied to the third embodiment of the laundry floating detection apparatus for implementing the dehydration administration control method of the present invention, the detection means according to the embodiment, the upper end of the reservoir (2) The light emitting part 50a and the light receiving part 50b which are provided in parallel with one side of the tub cover 8 installed in the tub cover 8, and the reflecting plate 60 provided on the other side so as to face the light emitting part 50a and the light receiving part 50b. .

According to the third embodiment of the present invention configured as described above, when the laundry rises above the height at which the light emitting unit 50a and the light receiving unit 50b are installed, light emitted from the light emitting unit 50a to the reflecting plate 60 is blocked. In this way, the floating of the laundry can be detected.

Next, FIG. 6 is a configuration diagram showing an example of a washing machine structure to which the fourth embodiment of the laundry float detection apparatus for implementing the dehydrating stroke control method of the present invention is applied. The detecting means according to the present embodiment includes: Light emitting portion 50a and light receiving portion 50b which are installed side by side inclined side by side inclined to the tub cover 8 installed in the tub cover 8 is provided on the tub cover 8 on the outer surface of the fluid balance provided on the upper end of the washing tank 3 And a reflecting plate 60 inclined to face the light emitting unit 50a and the light receiving unit 50b.

According to the fourth embodiment of the present invention configured as described above, when the laundry rises above the height at which the light emitting unit 50a and the light receiving unit 50b are installed, light emitted from the light emitting unit 50a to the reflecting plate 60 is blocked. As a result, the floating of the laundry can be detected through the same as in the fourth embodiment.

Next, FIG. 7 is a block diagram showing an example of a washing machine structure to which the fifth embodiment of the laundry float detection apparatus for implementing the dehydrating stroke control method of the present invention is applied, and the detecting means according to the present embodiment includes a water tank 2. Characterized in that the distance detection sensor 70 is installed on the lid 30 or the tub cover 8 installed on the top to detect the separation distance from the floating laundry.

In this case, an ultrasonic sensor may be applied as the distance detecting sensor 70.

According to the fifth embodiment of the present invention configured as described above, the separation distance from the floating laundry is detected by using the distance sensor 70 installed in the lid 30 or the tub cover 8 installed above the reservoir 2. When the detected distance is within a certain range, it is determined that the laundry is floating.

8 is a block diagram showing a structure of a washing machine to which the sixth embodiment of the laundry float detection apparatus for implementing the dehydration administration control method of the present invention is applied. The detection means according to the present embodiment is installed at the top of the reservoir 2. The tub cover (8) is characterized in that the electrode sensor for detecting this when the floating laundry abuts.

According to the sixth embodiment of the present invention configured as described above, when the laundry floats above the height at which the electrode sensor is installed and contacts the two electrodes constituting the electrode sensor at the same time, the change of the resistance value between the two electrodes is read. As a result, the floating of the laundry is detected.

9A is a block diagram showing an example of a structure of a washing machine to which a seventh embodiment of a laundry float detection apparatus for implementing a dehydration administration control method of the present invention is applied. FIG. 9B is a perspective view of a main part of FIG. The means is configured to include a floating prevention device 90 provided in the tub cover 8 provided at the upper end of the reservoir 2, and an electrode sensor 95 provided in the floating prevention device (90).

At this time, the floating prevention device 90 is a mesh structure which is installed to be located in the falling region of the wash water to be supplied to the inside of the washing tank 3 through the water supply port (40).

In addition, the electrode sensor 95 provided in the float prevention tool 90 is installed on the outer surface of the float prevention tool 90.

According to the seventh embodiment of the present invention configured as described above, when the laundry floats above the height at which the electrode sensor 95 is installed and contacts the two electrodes forming the electrode sensor 95 simultaneously, By reading the change in the resistance value, the floating of the laundry is detected.

In addition, the floating prevention device 90 of the mesh structure of the present embodiment is laundry is installed on the water supply port 40 side, and the washing water that floats near the water supply port 40 does not float above the floating prevention device 90. By blocking so as to be located on the side, it serves to prevent the water splashing phenomenon of the water supplied from the water supply port (40).

Hereinafter, a dehydration stroke control process in the washing machine having the float detection apparatus having the configuration according to the first to seventh embodiments will be described.

For reference, the process of water supply, washing and rinsing administration will be described first.

The water supply is started, and while the washing tank 3 is rotated, the floating detection sensor is turned on to detect whether the laundry is suspended.

As a result of the detection, if it is determined that the laundry is floating by the detection action of the floating detection sensor, a corresponding operation for preventing water scattering is performed.

In this way, while the water supply is performed by the corresponding operation for preventing water scattering, it is continuously checked whether the water supply level is the set level.

At this time, it is determined whether the floating laundry has been detected in the state where the water level does not reach the set level, and if the floating laundry has been detected, the countermeasure for continuing to prevent water scattering is continued. If it reaches, it stops supplying water and completes water supply administration.

On the other hand, in the above process, the corresponding operation for preventing water splashing can be made by reducing the rotational speed of the washing tub (3) when water supply while passing through the rotation.

In addition, in the above process, the corresponding operation for preventing water splashing may be made by reducing the rotational speed of the washing tub (3) when the water supply while passing through the rotation and gives an alarm.

In addition, in the above process, the corresponding operation for preventing water scattering may be made by stopping the water supply.

Next, the washing administration control process will be described.

First, the barrel is started, and the float detection sensor is turned on to detect whether the laundry is suspended.

As a result of the detection, when it is determined that the laundry is floating by the action of the floating detection sensor, a corresponding operation for preventing water scattering is performed.

Then, it is checked whether the washing time reaches the set washing time while performing the corresponding operation for preventing water scattering.

As a result of the detection, it is determined whether the floating laundry has been detected while the washing time does not reach the set washing time. If the floating laundry has been detected, the countermeasure for continuing to prevent water scattering is continued, and the washing time is set. If it reaches, the washing stops and the washing administration is completed.

On the other hand, in the above process, the corresponding operation for preventing water scattering can be made by decelerating and rotating the washing tank (3).

In addition, in the above process, the corresponding operation for preventing water scattering can be made by stopping the washing tank 3 and stirring only the pulsator 5.

In addition, in the above process, the corresponding operation for preventing water scattering can be made by rotating the washing tank 3 in reverse rotation and stirring the pulsator 5.

In addition, in the above process, the corresponding operation for preventing water scattering can be made by rotating the washing tub 3 at a speed at which the laundry is pressed.

That is, the rate at which the pressing washing is carried out refers to a speed at which the V-shaped water flow is made by centrifugal force, and the cannon water spraying into the washing tank 3 through the tub cover 8 is not formed. The laundry, wash water, and tub rotate at about the same speed.

On the other hand, in the above process, the corresponding operation for preventing water scattering can be made by stirring the washing tank (3).

Further, in the above process, the corresponding operation for preventing water scattering can be made by draining the water to lower the water level.

At this time, when performing drainage to prevent water scattering, if the washing tank 3 rotates at a high speed at a high speed, it is possible to spray through the tub cover 8, so that the water is simply drained to a level where no floating laundry is detected. do. In addition, as another method in performing drainage to prevent water scattering, even if the washing tank 3 is rotated at the maximum speed, the drainage is made to leave the minimum water level without spraying through the tub cover 8. There may be a way.

On the other hand, in the above process, the corresponding operation for preventing water splashing may be made by stopping the washing.

Next, the rinsing stroke control process will be described.

First, the floating detection sensor is turned on while the cylinder is started to detect whether the laundry is suspended.

As a result of the detection, when it is determined that the laundry is floating by the action of the floating detection sensor, a corresponding operation for preventing water scattering is performed.

Then, it is checked whether the rinsing time reaches the set rinsing time while performing the corresponding operation for preventing water scattering.

At this time, if the floating laundry has been detected in a state where the rinsing time has not reached the set rinsing time, and if the floating laundry has been detected, the countermeasure for continuing to prevent water scattering is continued. When the time is reached the rinse stops and the rinse cycle is completed.

On the other hand, in the above process, the corresponding operation for preventing water splash can be made by reducing the rotational speed of the washing tank (3).

In addition, in the above process, the corresponding operation for preventing water splashing can be made by reducing the rotational speed of the washing tank 3 and issuing an alarm.

In the above process, the corresponding operation for preventing water splashing may be performed by stopping the rinsing.

On the other hand, another rinsing stroke control method according to a feature of the present invention, the step of performing a shower water supply, starting the through rotation to turn on the floating detection sensor to detect whether the laundry floating, preventing water splashing when the floating laundry is detected Performing a corresponding operation for the step; checking whether the rinsing time has reached the set rinsing time; and determining whether the floating laundry has been detected when the rinsing time has not reached the set rinsing time. If there is an enemy, the step of continuing the corresponding operation for preventing water splashing, and if the rinse time reaches the set rinsing time, it may comprise the step of stopping the rinsing and completing the rinsing stroke.

In this case, as described in the above-described rinsing stroke control process, the corresponding operation for preventing water splashing may reduce the rotational speed of the washing tub 3, or may generate an alarm in addition to reducing the rotational speed of the washing tub 3, May stop the rinsing.

On the other hand, the dehydration administration is finally performed, the dehydration control process according to the present invention with reference to FIG. 10 as follows.

First, the floating detection sensor is turned on while the cylinder is started to detect whether the laundry is suspended.

As a result of the detection, when it is determined that the laundry is floating by the action of the floating detection sensor, a corresponding operation for preventing the cloth from being damaged and the tub cover 8 is performed.

Then, it is checked whether the dehydration time reaches the set dehydration time while performing the corresponding operation for preventing water scattering.

At this time, it is determined whether the floating laundry has been detected in the state that the dehydration time has not reached the set dehydration time, and if the floating laundry has been detected, the countermeasure operation for preventing damage to the cloth and wear of the tub cover 8 is continued. When the dehydration time reaches the set dehydration time, the dehydration is stopped and the dehydration administration is completed.

On the other hand, in the above process, the corresponding operation for preventing the cloth damage and wear of the tub cover 8 can be made by reducing the rotational speed of the washing tub (3).

In addition, in the above process, the corresponding operation for preventing the cloth damage and the wear of the tub cover 8 may be made by reducing the rotational speed of the washing tub 3 and alarming.

And, in the above process, the corresponding actuator for preventing cloth damage and wear of the tub cover 8 may be made by stopping dehydration.

So far, the present invention has been described with reference to preferred embodiments thereof, and one of ordinary skill in the art to which the present invention pertains may implement the modified embodiment within the essential technical scope of the present invention.

Here, the essential technical scope of the present invention is shown in the claims, and modifications within the scope equivalent thereto will be construed as being included in the present invention.

The dehydration stroke control method according to the present invention provides the following effects.

According to the present invention, a dehydration method corresponding to the case where the laundry is floating can be provided as compared to the dehydration method of the existing washing machine.

In addition, according to the present invention, it is possible to prevent damage caused by floating of laundry.

Therefore, the present invention provides an advantage of improving the product reliability of the washing machine by the various effects described above.

Claims (4)

Detecting whether the laundry is floating while starting the turning; Controlling the rotational speed of the washing tank to prevent the damage of the cloth and the wear of the tub cover when the floating laundry is detected, and performing a corresponding operation; Checking whether the set dehydration time has been reached, Determining whether the floating laundry has been detected when the dehydration time has not reached the set dehydration time, and if the floating laundry has been detected, continuing to perform a countermeasure for preventing cloth damage and tub cover abrasion; Dehydration operation control method of the washing machine comprising the step of stopping the dehydration and completing the dehydration stroke when the dehydration time reaches the set dehydration time. The method of claim 1, And the corresponding operation is performed by reducing the rotational speed of the washing tub. The method of claim 1, The corresponding operation is a dehydration administration control method of a washing machine, characterized in that the alarm is made by reducing the rotational speed of the washing tank. The method of claim 1, And the corresponding operation is performed by stopping rotation of the washing tank to stop dehydration.

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