KR20100118637A - Washing machine and control method thereof - Google Patents

Abstract

PURPOSE: A washing machine and a control method thereof are provided to reduce the vibration by adjusting the unbalanced position, a rotating direction and an entering operation when the spin-drying operation is performed. CONSTITUTION: A control method of a washing machine is as follows. It is checked whether a first tub and a second tub perform spin-drying operations(S10), the spin-drying operations of the first and second tubs are adjusted and the vibration of the washing machine is reduced. The performing states of the spin-drying operations of the first and second tubs are checked based on whether while any one tub spin-dries, the other tub reached a spin-drying step(S14). If yes, the tub, which reached the spin-drying step later, is adjusted to perform the spin-drying operation in the opposite direction to the other tub(S15), which spin-dried first.

Description

Washing machine and its control method {WASHING MACHINE AND CONTROL METHOD THEREOF}

The present invention relates to a washing machine having a plurality of washing tanks capable of washing laundry according to the capacity and type of laundry, and a control method thereof.

In general, a washing machine (usually a drum washing machine) is a device for washing a contaminated laundry (water) by using one washing tank and washing with water and a detergent. (Specificly, washing water) to separate the contamination of the fabric with a wash, a rinse stroke to rinse the foam or residual detergent with water (specifically, rinsing water) that does not contain detergent, and dewatering to dehydrate the fabric at high speed. The washing is performed by a series of operations such as stroke.

In recent years, such a washing machine is provided with a drying function to perform a drying process of drying the dehydrated fabric. However, depending on the type or material of the cloth may not be able to put together in one washing tank, and the washing machine equipped with one washing tank had to be put separately together to wash separately. In this case, the inconvenience of separate washing and the washing machine must be operated several times (for example, two times), which causes a great waste of time and energy. In addition, even when a small amount of cloth is to be washed, if the washing tank is a large capacity, a large capacity washing tank has to be driven, resulting in unnecessary waste of power.

According to an aspect of the present invention to provide a method for reducing the vibration of the washing machine by adjusting the unbalanced position of the washing tank during the dehydration stroke of the washing machine having two washing tanks.

In addition, according to another aspect of the present invention to provide a method for reducing the vibration of the washing machine by controlling the spin direction and dehydration operation in the dehydration stroke of the washing machine having two washing tanks.

The control method of the washing machine according to an embodiment of the present invention for the control method of the washing machine having a first washing tank and a second washing tank, to determine whether the dehydration of the first washing tank and the second washing tank proceeds, It is preferable to reduce the vibration of the washing machine by adjusting the dehydration operation of the first washing tank or the second washing tank.

Determining whether the dehydration of the first washing tank and the second washing tank proceeds to determine whether the dehydration step of the other washing tank which does not proceed with dehydration during the dehydration of either the first washing tank or the second washing tank is reached. It is preferable.

When the dehydration step is reached in another washing tank which has not been dewatered, the washing tank having reached the dehydration step first adjusts the dewatering operation of the washing tank so as to perform the dehydration rotation in a direction opposite to the dehydration rotation direction of the washing tank which proceeds with dehydration. It is preferable.

When the dehydration step is reached in another washing tank which has not been dewatered, it is preferable to adjust the dehydration operation of the washing tank to prevent the washing tank from entering the dehydration step until the dehydration operation of the washing tank that is dewatering is stopped. .

Checking whether the first washing tank and the second washing tank proceed with dehydration, it is preferable to check whether the first washing tank and the second washing tank reach the dehydration step at the same time.

When the dehydration step is reached in the first washing tank and the second washing tank at the same time, it is preferable to adjust the dehydration operation of the washing tank to perform the dehydration operation by changing the dehydration rotation direction of the first washing tank or the second washing tank.

When the dehydration step is reached in the first washing tank and the second washing tank at the same time, it is preferable to adjust the dehydration operation of the washing tank to perform the dehydration operation in only one of the first washing tank and the second washing tank.

The washing tank not performing the dehydration operation is preferably adjusted to the dehydration operation of the washing tank to perform the dehydration operation when the dehydration operation of the other washing tank is completed.

Checking whether or not dehydration of the first washing tank and the second washing tank is performed, it is preferable to confirm whether dehydration is simultaneously performed in the first washing tank and the second washing tank.

When dehydration is simultaneously performed in the first washing tank and the second washing tank, it is preferable to check the unbalanced positions of the first washing tank and the second washing tank.

A first drum and a second drum are rotatably installed in the first washing tank and the second washing tank, respectively, and detecting the unbalanced position by detecting the rotational speed of the first drum or the second drum. Do.

To determine the unbalanced position by detecting the rotational speed of the first drum or the second drum, it is preferable to identify the point where the rotational acceleration of the first drum or the second drum becomes "0".

Determining the unbalanced position by detecting the rotational speed of the first drum or the second drum includes a time point at which the rotational acceleration becomes "0" while the rotational speed of the first drum or the second drum increases and decreases. Preferably, the unbalance is located at the highest point of the first drum or the second drum.

Determining the unbalanced position by detecting the rotational speed of the first drum or the second drum includes a time point at which the rotational acceleration becomes "0" while the rotational speed of the first drum or the second drum decreases and then increases. Preferably, the unbalance is located at the lowest point of the first drum or the second drum.

When the unbalanced position of the first washing tank or the second washing tank is confirmed, it is preferable to reduce the vibration of the washing machine by adjusting the unbalanced position of the first washing tank or the second washing tank.

Adjusting the unbalanced position of the first washing tank or the second washing tank is to adjust the position of the unbalance by adjusting the difference between the position angles of the unbalance of the first washing tank and the unbalance of the second washing tank to be more than a reference angle. desirable.

Adjusting the unbalanced position of the first washing tank or the second washing tank, it is preferable to adjust the unbalance position by adjusting the dehydration rotation speed of the first washing tank or the second washing tank to adjust the dewatering operation of the washing tank. .

When dehydration is simultaneously performed in the first washing tank and the second washing tank, it is preferable to adjust the dehydration operation of the washing tank by changing the dehydration rotation direction of the first washing tank or the second washing tank.

It is preferable to check the dehydration rotation speed of the first washing tank and the second washing tank, and to adjust the dehydration operation of the washing tank by changing the rotation direction of the washing tank in which the dehydration rotation speed of the first washing tank and the second washing tank is relatively slow.

In addition, the washing machine according to an embodiment of the present invention includes a plurality of washing tanks; and checking whether the washing tank is dehydrated and performing dehydration operation in the washing tank to reduce vibration of the washing machine by adjusting the dehydrating operation of the washing tank. It is preferable to include a control unit.

The plurality of washing tubs may include a first washing tub and a second washing tub rotatably installed with a first drum and a second drum, and the controller may adjust the rotational motion of the first drum and the second drum to prevent vibration of the washing machine. It is desirable to reduce.

Preferably, the apparatus further includes a speed detector configured to detect a speed of the first drum or the second drum.

The controller may check the unbalanced position of the first washing tank or the second washing tank according to the speed of the first drum or the second drum.

The control unit may reduce vibration of the washing machine by adjusting the unbalanced position of the first washing tank or the second washing tank.

The control unit may adjust the difference between the position angles of the unbalance of the first washing tank and the unbalance of the second washing tank to be greater than or equal to the reference angle.

The control unit may reduce the vibration of the washing machine by adjusting the dehydration rotation direction of the first drum and the second drum in reverse.

On the other hand, according to one aspect of the present invention described above it is possible to reduce the vibration of the washing machine by adjusting the unbalanced position of the washing tank during the dehydration stroke of the washing machine having two washing tanks.

In addition, according to another aspect of the present invention to reduce the vibration of the washing machine by changing the direction of the two dehydration rotation during the dehydration stroke of the washing machine having two washing tanks, or by preventing the entry of the dehydration operation of the other washing tank during the dehydration of one washing tank. can do.

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

1 is a perspective view showing the appearance of a washing machine according to an embodiment of the present invention.

As shown in FIG. 1, the washing machine 100 includes a main body 301 that forms an exterior, and a course and function buttons provided at the center of the main body 301 to select a washing course and a washing function for each washing tank. And an input unit 203 for inputting a user command related to the operation of the washing course and the washing machine 100, a display unit 204 for displaying the operating state of the washing course and the washing machine 100, and an upper portion of the front surface of the main body 301. It may be configured to include a first door 201 provided in the washing tank to put a small amount of laundry in the washing tank, and a second door 202 provided in the lower front of the main body 301 to put a large amount of laundry in the washing tank. have.

2 is a cross-sectional view showing the configuration of a washing machine according to an embodiment of the present invention.

As shown in FIG. 2, the washing machine 100 includes a plurality of washing tanks 302 and 303 divided up and down in the main body 301 forming the exterior to separate and wash the cloths according to the capacity or type of the cloth. At the top, a first washing tank 302 for a small amount of washing is installed, and a second washing tank 303 for a large amount of washing is installed at the bottom. At this time, the installation position of the first and second washing tanks 302 and 303 can be changed, and it is also possible to configure the washing tank of the same capacity as needed, but due to the characteristics of the washing machine 100 having a plurality of washing tanks, the washing tank has a large capacity and a small capacity. It is preferable to install separately. This is to prevent unnecessary waste of power by driving only the small capacity of the first washing tank 302 when washing a small amount of cloth as described above. On the other hand, the basic configuration of the first washing tank 302 and the second washing tank 303 are the same, the first washing tank 302 and the cylindrical first drum 304 having a plurality of holes formed in the interior (303) And a second drum 305 are respectively installed.

On one side of the washing machine body 301, two water supply valves 306a and 306b and a water supply hose 307 are installed to supply water necessary for washing, and the water supply hose 307 is divided into two parts, one of which is a water supply valve. It communicates with the 1st washing tank 302 through A (306a), and the other is connected with the 2nd washing tank 303 through the feed water valve B (306b), and according to the user's order by the input part 203. The water supply valve A 306a and the water supply valve B 306b are selectively or both automatically opened and closed to supply water to the first washing tank 302 and the second washing tank 303.

 The first and second rotary shafts connected to the first drum 304 and the second drum 305 may be rotated outside the rear surfaces of the first washing tank 302 and the second washing tank 303 to perform washing, rinsing, and dehydration strokes. First and second motors 310a and 310b are installed as driving devices, respectively.

In addition, the first motor 310a is connected by a belt to the rotating wheel 311a connected by the first drum 304 and the shaft, and similarly for washing by the second washing tank 303 The two motors 310b are connected to the rotating wheel 311b connected to the second drum 305 by a shaft by a belt.

On the other hand, one side of the first washing tank 302 and the second washing tank 303 is in communication with the drain pipe drain pipe A (308a) and the drain pipe B (308b) for draining contaminated laundry, respectively, the drain pipe A (308a) and the drain pipe B (308b) is in communication with each other in the lower side of the washing machine 100 will have a single outlet (309).

On the other hand, the above-described washing machine 100 has been described as an example of installing the first washing tank 302 and the second washing tank 303 up and down, the present invention is not limited to this, the first washing tank 302 and the first Even if the washing tank 303 is installed from side to side, the same object and effect as the present invention can be achieved.

3 is a control block diagram of a washing machine in one embodiment of the present invention.

As shown in FIG. 3, the washing machine 100 includes an input unit 203 for inputting a driving command of a user including setting of a dehydration stroke, and a controller for controlling overall operations of the washing machine 100 such as washing, rinsing, and dehydration. 400, the motor drive unit 410 for driving the first motor 310a and the second motor 310b according to the control signal of the control unit 400, and the rotational speed of the drum (304, 305) in the washing tank (302, 303) Speed detection unit 420 for transmitting the rotational speed signal of the motor (310a, 310b) corresponding to the control unit 400 may be included.

The input unit 203 may select a washing course and a washing function for each of the washing tanks 302 and 303, and may be adjusted to manually enter a dehydration stroke in each washing tank 302 and 303.

The controller 400 adjusts the position of the unbalance to reduce vibrations when the dehydration operation is performed in the washing machine 100. Specifically, the control unit 400 checks whether the first washing tank 302 and the second washing tank 303 are dehydrated, and when dehydration is simultaneously performed in the two washing tanks 302 and 303, the unbalanced positions of the respective washing tanks 302 and 303 are performed. After confirming, the rotation speed of dehydration in the first washing tank 302 or the second washing tank 303 is controlled so that the phase difference of unbalance in the two washing tanks 302 and 303 is greater than or equal to the reference angle.

In addition, when the dehydration is in progress in only one of the washing tanks 302 or 303 of the first washing tank 302 or the second washing tank 303 of the washing machine 100, the control unit 400 may be configured to replace the other washing tanks 302 or 303. Vibration can be reduced by preventing the dehydration operation from entering.

In addition, the control unit 400 in the other washing tank 302 or 303 when dehydration is in progress in only one of the washing tank 302 or 303 of the first washing tank 302 or the second washing tank 303 of the washing machine 100. When entering the dehydration stroke step, the vibration of the washing machine 100 may be reduced by adjusting the dehydration rotation directions of the first and second washing tanks 302 and 303 in reverse. On the other hand, when the dewatering rotation directions of the two washing tanks 302 and 303 are reversed, the rotation direction of the unbalance between the washing tanks 302 and 303 is reversed, so that the vibration of the washing machine 100 is reduced than when the dehydration rotation is performed in the same direction.

The motor driver 410 outputs a drive signal such as a PWM signal to the first motor 310a and the second motor 310b according to the control signal of the controller 400, thereby providing the first motor 310a and the second motor 310b. You can adjust the speed of).

The speed detector 420 may be implemented as a hall sensor or an encoder, and transmits a motor speed signal corresponding to the rotation speed of each of the first motor 310a and the second motor 310b to the controller 400.

4A and 4B are cross-sectional views schematically illustrating positions of unbalance due to laundry in the washing machine 100 according to an embodiment of the present invention, and FIG. 4C is a view of the washing machine 100 according to an embodiment of the present invention. It is a graph showing the change of dehydration rate in the unbalanced state.

As shown in FIG. 4A, when the positions of the unbalance 500 are increased when the drums 304 and 305 inside the washing tanks 302 and 303 are dehydrated and rotated, the rotation speeds of the drums 304 and 305 are decelerated, and as shown in FIG. 4B. When the position of the unbalance 500 is lowered, the rotation speeds of the drums 304 and 305 are accelerated. The change in speed described above is a phenomenon caused by gravity acting on unbalance, and the change in speed of the drums 304 and 305 is graphically shown in FIG. 4C. Here, the difference (p) between the maximum value and the minimum value of the graph is a variable that depends on the weight of the unbalance 500 due to the laundry, and tends to be proportional to the unbalance 500.

 At this time, considering the gravity effect due to the mass of the unbalance 500, it is determined that the position of the unbalance 500 is located at the lowest point A of the drums 304 and 305 when the speed of the drums 304 and 305 is the fastest. It can be seen that the position of the unbalance 500 is located at the highest point B of the drums 304 and 305 at the time when the drums 304 and 305 are the slowest.

On the other hand, when the unbalance 500 reaches the low point A and the high point B of the drums 304 and 305, the rotational acceleration of the drums 304 and 305 becomes "0" (zero slope in the time-speed graph). have. Specifically, the highest point of the first drum 304 or the second drum 305 at the time when the rotational acceleration becomes “0” while the rotation speed of the first drum 304 or the second drum 305 increases and decreases. It can be seen that the unbalance 500 is located at the first drum 304 when the rotational speed of the first drum 304 or the second drum 305 decreases and increases, and the rotational acceleration becomes "0". Alternatively, it can be seen that the unbalance 500 is located at the lowest point of the second drum 305.

5A and 5B are schematic views illustrating positions of unbalances during a dehydration rotation operation of the washing machine 100 having a plurality of washing tanks according to an embodiment of the present invention.

As shown in FIG. 5A, when the position of the unbalance 510 of the first washing tank 302 is on the right side, the position of the unbalance 520 of the second washing tank 303 is located on the right side of the first washing tank. Centrifugal force due to the dewatering rotation of the 302 and the second washing tank 303 becomes a combined force (F = F '+ F' ') to generate a large vibration. That is, when the positions of the unbalances 510 and 520 of the two washing tanks 302 and 303 are in phase, the two forces F and F '' which generate vibrations due to the dehydration rotation are combined (F = F '+ F'). ') And the vibration of the entire washing machine 100 is increased.

As shown in FIG. 5B, when the position of the unbalance 510 of the first washing tank 302 is on the left side, the unbalance 520 of the second washing tank 303 is unbalanced 510 of the first washing tank 302. If the position is opposite to the phase, the centrifugal force due to the rotation of each washing tank (302,303) is canceled (F = F ''-F ') to reduce the vibration.

At this time, according to an aspect of the present invention, the control unit 400 adjusts the unbalanced positions of the first washing tank 302 and the second washing tank 303 to have the opposite phase (180 degrees), thereby causing a washing machine due to dehydration rotation ( It is possible to reduce the vibration of 100).

6A is a control flowchart for reducing vibration during the dehydration stroke of the washing machine according to one embodiment of the present invention.

As shown in FIG. 6A, when the vibration reduction control operation of the washing machine 100 starts, the controller 400 checks whether the first washing tank 302 and the second washing tank 303 are dehydrated.

Next, the control unit 400 checks whether the dehydration stroke is in progress at the same time in the two washing tanks 302 and 303, and if the dehydration stroke is in progress at the same time in the two washing tanks 302 and 303, the first washing tank 302 and the second washing tank 303. Adjust the direction of dehydration rotation in the reverse direction. That is, when the dehydration rotation direction of the first washing tank 302 and the second washing tank 303 is the same direction, the dehydration rotation direction of any one of the washing tanks 302 or 303 is changed in the opposite direction to proceed with the dehydration stroke. If the dehydration rotation direction of the washing tank 302 and the second washing tank 303 is the opposite direction, the dehydration rotation is maintained by maintaining the existing dehydration rotation direction. At this time, it is preferable to change the dehydration rotation direction of the washing tank 302 or 303 in which the dehydration rotation speed is relatively low among the first washing tank 302 and the second washing tank 303. (s11, s13)

Next, the controller 400 checks the unbalanced positions of the first washing tank 302 and the second washing tank 303, and performs unbalanced position control to reduce vibration of the washing machine by adjusting the identified unbalance positions. This will be described in detail with reference to FIG. 7 (s16).

On the other hand, when the dehydration stroke is in progress only in one washing tank 302 or 303, the control unit 400 checks whether or not the dehydration stroke stage of the other washing tank 302 or 303 which does not proceed with the dehydration stroke is reached. s14)

 When the controller 400 determines that the dehydration step is reached by another washing tank 302 or 303 that has not been dewatered, the controller 400 may be in a different direction from the dehydration rotation direction of the washing tank 302 or 303 that is dewatering. The dehydration rotation operation is performed to enter the dehydration step.

At this time, the vibration of the washing machine 100 can be reduced by performing the dehydration rotation in a direction opposite to the dehydration rotation direction of the washing tank 302 or 303 which is dehydrating.

6B is a control flowchart for reducing vibration during the dehydration stroke of the washing machine according to another embodiment of the present invention.

FIG. 6B illustrates another washing tank in which a dehydration stroke is not performed when only a washing tank 302 or 303 of either the first washing tank 302 or the second washing tank 303 provided in the washing machine 100 is in progress. This is different from FIG. 6A in that 302 or 303 prevents entry into the dehydration step.

As shown in FIG. 6B, when the vibration reduction control operation of the washing machine 100 is started, the controller 400 checks whether the first washing tank 302 and the second washing tank 303 are dehydrated.

Next, the control unit 400 checks whether the dehydration stroke is in progress at the same time in the two washing tanks 302 and 303, and if the dehydration stroke is in progress at the same time in the two washing tanks 302 and 303, the first washing tank 302 and the second washing tank 303. Adjust the direction of dehydration rotation in the reverse direction. (s21, s23)

Next, the controller 400 checks the unbalanced positions of the first washing tank 302 and the second washing tank 303, and performs unbalanced position control to reduce vibration of the washing machine by adjusting the identified unbalance positions. (s26)

On the other hand, when the dehydration stroke is in progress in only one washing tank 302 or 303, the controller 400 checks whether the dehydration stroke step is reached in another washing tank 302 or 303 which does not proceed with the dehydration stroke. s22, s24)

 If it is determined that the dehydration step is reached by another washing tank 302 or 303 which has not been dewatered, the controller 400 prevents the washing tank 302 or 303 from entering the dehydration step. )

Then, the control unit 400 checks whether the dehydration operation of the washing tank 302 or 303 performing the dehydration operation is completed, and if it is confirmed that the dehydration operation is completed, the control unit 400 performs the dehydration operation of the washing tank 302 or 303 reaching the dehydration step. Perform (s27, s28)

6C is a control flowchart for reducing vibration during the dehydration stroke of the washing machine according to another embodiment of the present invention.

FIG. 6C differs from FIG. 6A in that the dehydration rotation directions of the first washing tank 302 and the second washing tank 303 are not reversely adjusted while the two washing tanks 302 and 303 are simultaneously dewatering.

As shown in FIG. 6C, when the vibration reduction control operation of the washing machine 100 starts, the controller 400 checks whether the first washing tank 302 and the second washing tank 303 are dehydrated.

Next, the control unit 400 checks whether the dehydration stroke is in progress at the same time in the two washing tanks 302, 303, and if the dehydration stroke is in progress at the same time in the two washing tanks 302, 303, the first washing tank 302 and the second washing tank 303. Checks the unbalanced position and adjusts the unbalanced position to perform unbalanced position control to reduce vibration of the washing machine. (S30, s31, s35)

On the other hand, when the dehydration stroke is in progress in only one washing tank 302 or 303, the controller 400 checks whether the dehydration stroke step is reached in another washing tank 302 or 303 which does not proceed with the dehydration stroke. s32, s33)

 When the controller 400 determines that the dehydration step is reached by another washing tank 302 or 303 that has not been dewatered, the controller 400 may be in a different direction from the dehydration rotation direction of the washing tank 302 or 303 that is dewatering. The dehydration rotation operation is performed to enter the dehydration step.

Next, the unbalance position control to reduce the vibration of the washing machine 100 by adjusting the position of the unbalance is performed.

6D is a control flowchart for reducing vibration during the dehydration stroke of the washing machine according to another embodiment of the present invention.

FIG. 6D differs from FIG. 6B in that the dehydration rotation directions of the first washing tank 302 and the second washing tank 303 are not reversely adjusted while the two washing tanks 302 and 303 are simultaneously dewatering.

As shown in FIG. 6D, when the vibration reduction control operation of the washing machine 100 is started, the controller 400 checks whether the first washing tank 302 and the second washing tank 303 are dehydrated.

Next, the control unit 400 checks whether the dehydration stroke is in progress at the same time in the two washing tanks 302, 303, and if the dehydration stroke is in progress at the same time in the two washing tanks 302, 303, the first washing tank 302 and the second washing tank 303. Check the unbalanced position of), and perform unbalanced position control to reduce the vibration of the washing machine by adjusting the identified unbalanced position. (s41, s45)

On the other hand, when the dehydration stroke is in progress in only one washing tank 302 or 303, the controller 400 checks whether the dehydration stroke step is reached in another washing tank 302 or 303 which does not proceed with the dehydration stroke. s42, s43)

 If it is determined that the dehydration step is reached by another washing tank 302 or 303 that has not been dewatered, the controller 400 prevents the washing tank 302 or 303 from entering the dehydration step. )

Then, the control unit 400 checks whether the dehydration operation is completed in the washing tank 302 or 303 which is performing the dehydration operation, and if it is confirmed that the dehydration operation is completed, dehydration of the washing tank 302 or 303 reaching the dehydration step. Perform the operation (s46, s47).

7 is a control flowchart illustrating an unbalanced position control method of the washing machine 100 according to an embodiment of the present invention.

As shown in FIG. 7, the control unit 400 includes a first drum 304 and a second drum 305 rotatably installed in the first washing tank 302 and the second washing tank 303, respectively. If it is, it is checked whether the rotation speeds of the first drum 304 and the second drum 305 have reached a steady state. At this time, the rotation speeds of the first drum 304 and the second drum 305 are the same as the rotation speeds of the first motor 310a and the second motor 310b, respectively.

Next, when the rotational speeds of the first drum 304 and the second drum 305 reach a steady state, the unbalance positions of the respective drums 304 and 305 are sensed. In detail, the controller 400 receives information about the rotation speeds of the first drum 304 and the second drum 305 from the speed detector 420, and the speeds of the drums 304 and 305 have a predetermined period. When the speed of the drums 304 and 305 increases and decreases or when the speeds of the drums 304 and 305 decreases and then increases, the unbalanced position of the washing tank is located at the low point A or the high point B, respectively. By determining that the unbalanced position can be detected (S51, s52).

Next, the controller 400 performs the spin speed control when the unbalance is detected. That is, the first drum 304 and the second drum 305 are controlled by adjusting the speed of one drum 304 or 305 of the first drum 304 or the second drum 305 or the two drums 304 and 305. The position difference angle (phase difference) of the unbalance of) is controlled to reach the reference angle. Here, the reference angle may be arbitrarily determined by the designer, and ideally, 180 degrees may be determined as the reference angle. For example, if the unbalanced position of the first washing tank 302 is at the lowest point of the first washing tank 302 and the unbalanced position of the second washing tank 303 is at the highest point of the second washing tank 303, the unbalanced position is unbalanced. The difference angle is 180 degrees (s53)

 On the other hand, the position difference angle of the unbalance described above means the phase difference angle of the point where the unbalance is located in each washing tank (302,303), if the position difference angle is larger centrifugal force (F) due to the dehydration rotation of the two drums (304,305) This summation can be minimized.

1 is a perspective view showing the appearance of a washing machine according to an embodiment of the present invention;

2 is a cross-sectional view showing the configuration of a washing machine according to an embodiment of the present invention.

3 is a control block diagram of a washing machine in one embodiment of the present invention

4a and 4b are cross-sectional views schematically showing the position of the unbalance by the laundry in the washing machine according to an embodiment of the present invention

Figure 4c is a graph showing the change in dehydration rate in the unbalanced state of the washing machine according to an embodiment of the present invention

5a and 5b is a schematic diagram showing the position of the unbalance during the dewatering rotation operation in the washing machine according to an embodiment of the present invention

Figure 6a is a control flow diagram for vibration reduction during the dehydration stroke of the washing machine according to an embodiment of the present invention

Figure 6b is a control flow diagram for reducing vibration during the dehydration stroke of the washing machine according to another embodiment of the present invention

6c is a control flowchart for reducing vibration during a dehydration stroke of a washing machine according to another embodiment of the present invention;

Figure 6d is a control flow diagram for vibration reduction during the dehydration stroke of the washing machine according to another embodiment of the present invention

7 is a control flow diagram illustrating an unbalanced position control method of a washing machine according to an embodiment of the present invention.

Description of the Related Art [0002]

302,303 First and second washing tanks 304,305 First and second drums

310a, 310b: first and second motor

Claims (26)

In the control method of a washing machine having a first washing tank and a second washing tank, Check whether the first washing tank and the second washing tank are dehydrated, The control method of the washing machine to reduce the vibration of the washing machine by adjusting the dehydration operation of the first washing tank or the second washing tank. The method of claim 1, Determining whether or not dehydration of the first washing tank and the second washing tank, The control method of the washing machine to check whether the dehydration step of the other washing tank that did not proceed dehydration during the dehydration of any one of the first washing tank or the second washing tank. The method of claim 2, When the dehydration step is reached in another washing tank that did not proceed to the dehydration, The washing tank reaching the dehydration step is a control method of the washing machine to adjust the dehydration operation of the washing tank to perform the dehydration rotation in the direction opposite to the dehydration rotation direction of the washing tank to proceed with the first dewatering. The method of claim 2, When the dehydration step is reached in another washing tank that did not proceed to the dehydration, The control method of the washing machine to adjust the dewatering operation of the washing tank to prevent entering the dehydration step of the other washing tank until the dewatering operation of the washing tank to proceed with the dehydration. The method of claim 1, Determining whether or not dehydration of the first washing tank and the second washing tank, The control method of the washing machine to check whether the dehydration step is reached at the same time in the first washing tank and the second washing tank. The method of claim 5, When the dehydration step is reached at the same time in the first washing tank and the second washing tank, The control method of the washing machine to adjust the dewatering operation of the washing tank to perform the dewatering operation by changing the dewatering rotation direction of the first washing tank or the second washing tank. The method of claim 5, When the dehydration step is reached at the same time in the first washing tank and the second washing tank, The control method of the washing machine to adjust the dewatering operation of the washing tank to perform the dewatering operation only in any one of the first washing tank or the second washing tank. The method of claim 7, wherein The washing tank not performing the dehydration operation is a control method of the washing machine to adjust the dehydration operation of the washing tank to perform the dehydration operation when the dehydration operation of the other washing tank is completed. The method of claim 1, Confirming whether or not dehydration of the first washing tank and the second washing tank proceeds, The control method of the washing machine to check whether dehydration in the first washing tank and the second washing tank at the same time. The method of claim 9, The control method of the washing machine to check the unbalanced position of the first washing tank and the second washing tank when dehydration in the first washing tank and the second washing tank at the same time. The method of claim 10, The first drum and the second drum are rotatably installed in the first washing tank and the second washing tank, respectively. The control method of the washing machine to check the unbalanced position by detecting the rotational speed of the first drum or the second drum. The method of claim 11, Determining the unbalanced position by detecting the rotational speed of the first drum or the second drum, The control method of the washing machine to check the point where the rotational acceleration of the first drum or the second drum becomes "0". 13. The method of claim 12, Determining the unbalanced position by detecting the rotational speed of the first drum or the second drum, Confirming that the unbalance is located at the highest point of the first drum or the second drum at the time when the rotation acceleration becomes “0” while the rotation speed of the first drum or the second drum increases and decreases. The control method of the washing machine. The method of claim 13, Determining the unbalanced position by detecting the rotational speed of the first drum or the second drum, Confirming that the unbalance is located at the lowest point of the first drum or the second drum at a time when the rotation acceleration becomes “0” while the rotation speed of the first drum or the second drum decreases and increases. The control method of the washing machine. The method of claim 10, When the unbalanced position of the first washing tank or the second washing tank is confirmed, The control method of the washing machine to reduce the vibration of the washing machine by adjusting the position of the unbalance of the first washing tank or the second washing tank. The method of claim 15, Adjusting the unbalanced position of the first washing tank or the second washing tank, The control method of the washing machine to adjust the position of the unbalance by adjusting the difference between the position angle of the unbalance of the first washing tank and the unbalance of the second washing tank is more than the reference angle. The method of claim 15, Adjusting the unbalanced position of the first washing tank or the second washing tank, The control method of the washing machine to adjust the unbalance position by adjusting the dehydration rotation speed of the first washing tank or the second washing tank. The method of claim 9, Control of the washing machine to adjust the dewatering operation of the washing tank by changing the dehydration rotation direction of the first washing tank or the second washing tank when the dehydration in the first washing tank and the second washing tank at the same time. The method of claim 18, Check the dehydration rotation speed of the first washing tank and the second washing tank, Control method of the washing machine to adjust the dehydration operation of the washing tank by changing the rotation direction of the washing tank relatively slow dehydration rotation speed of the first washing tank and the second washing tank. A plurality of washing tanks; And a controller for checking whether the washing tank is dehydrated and adjusting the dehydrating operation of the washing tank to reduce vibration of the washing machine. The method of claim 20, The plurality of washing tubs include a first washing tub and a second washing tub rotatably installed with a first drum and a second drum, The control unit is a washing machine to reduce the vibration of the washing machine by adjusting the rotation operation of the first drum and the second drum. The method of claim 21, And a speed detector for detecting a speed of the first drum or the second drum. The method of claim 22, The control unit checks the unbalanced position of the first washing tank or the second washing tank according to the speed of the first drum or the second drum. The method of claim 23, The control unit is a washing machine to reduce the vibration of the washing machine by adjusting the position of the unbalance of the first washing tank or the second washing tank. The method of claim 24, The control unit is a washing machine for adjusting the difference between the position angle of the unbalance of the first washing tank and the unbalance of the second washing tank more than the reference angle. The method of claim 21, The control unit to reduce the vibration of the washing machine by adjusting the dehydration rotation direction of the first drum and the second drum in reverse.

Images