KR102339979B1 - A washing machine and method of controlling the washing machine - Google Patents

Abstract

In the washing machine and washing machine control method of the present invention, before spin-drying, the washing tub is rotated at a speed lower than the resonant speed range and spin-drying is performed to some extent from the cloth in advance, which reduces the spin-drying load and ensures homogeneous spin-drying performance. .

Description

A washing machine and method of controlling the washing machine

The present invention relates to a washing machine and a method for controlling the washing machine.

In general, a washing machine is a device that washes laundry using the emulsification action of detergent, the water flow action generated by the rotation of the washing tub or laundry blades, and the impact action applied by the laundry blades. Or, remove the contamination attached to the laundry). In such a washing machine, a washing tub into which cloth (or laundry) is put and a pulsator provided in the washing tub are rotated by a motor to perform washing, rinsing, and spin-drying to process laundry.

In a washing machine, a water storage tub is suspended in a casing forming an exterior, and the washing tub is rotatably provided in the water storage tub, and constitutes a vibration system in which vibration of the water tub is induced by rotation of the washing tub. In such a vibration system, it is well known that excessive vibration due to resonance occurs when the forced frequency of the water storage tub induced by the rotation of the washing tub coincides with the natural frequency of the washing machine. Although the natural frequency of a washing machine varies depending on factors such as the amount of cloth put into the washing tub (hereinafter referred to as the amount of laundry) and the amount of washing water contained in the water storage tub (hereinafter referred to as the quantity), in general, the washing machine Since there are limits to the amount and quantity of laundry allowed for the normal operation of the washing machine, the natural frequency of the washing machine also has a value within a certain range, which can be grasped through experiments. Therefore, in a conventional washing machine, during the spin-drying process, the washing tub is accelerated to quickly pass through a speed range (hereinafter referred to as a resonance speed range) in which excessive vibration is expected, and then rotated at a preset spin-drying speed for a predetermined time. is designed

More specifically, in the conventional washing machine, after washing or rinsing, the washing tub is stopped and drained until the water level in the water storage tank reaches the empty water level. However, in this conventional method, since the cloth contains a significant amount of wash water even after drainage is complete, the dewatering load is also large, which acted as a factor impairing the stability of the entire vibration system during the dewatering process.

The problem to be solved by the present invention is first, after spinning the washing tub below the resonance speed range to dehydrate the fabric to some extent, then accelerating the washing tub to rotate the washing tub at a speed set higher than the resonance speed range and removing the wash water remaining in the fabric. It is to provide a washing machine and a control method of the washing machine to be further removed.

Second, it is to provide a washing machine and a control method of the washing machine in which the load applied to the driving unit in the dehydration cycle is reduced compared to the related art.

A method of controlling a washing machine according to the present invention is a control method of a washing machine comprising: a water storage tank containing wash water; (b) accelerating the washing tub to a pre-dehydration pre-treatment speed set below the resonance speed range in which resonance occurs, and then rotating the washing tub at the de-watering pre-treatment speed for a certain period of time; and (c) rotating the washing tub at a dehydration speed higher than the dehydration pretreatment speed.

Alternatively, the method for controlling a washing machine according to the present invention is a method for controlling a washing machine comprising: a water storage tank containing wash water; and a laundry tank accommodating a cloth and rotatably provided in the water storage tank. It is carried out after removing the; drain the reservoir; detecting the amount of laundry in the washing tub; Rotating the washing tub at an eccentricity sensing speed that is less than a resonance speed range at which resonance is generated by rotation of the washing tub, but at which the cloth is rotated integrally with the washing tub by centrifugal force, and detects the amount of eccentricity; rotating the washing tub at a dehydration pretreatment speed that is higher than the eccentricity detection speed but lower than the resonance speed range, performed according to the sensed laundry amount; and rotating the washing tub at a dehydration rate higher than the dewatering pretreatment rate.

The washing machine of the present invention includes a water storage tank containing washing water; a washing tub that accommodates the cloth and is rotatably provided in the water storage tub; a driving unit for rotating the washing tub; a drain pump for draining the water tank; and after the washing tub is accelerated to a pre-dehydration speed set below the resonance speed range in which resonance occurs, the driving unit is controlled to rotate at the spin-drying pre-treatment speed for a certain period of time, and while the washing tub is rotated at the spin-drying pre-treatment speed and a controller controlling the drain pump to operate, and controlling the driving unit so that the washing tub rotates at a dehydration speed higher than the dewatering pretreatment speed after the predetermined time has elapsed.

The washing machine and the control method of the washing machine of the present invention rotate the washing tub below the resonance speed range to dehydrate the fabric to some extent, then accelerate the washing tub to rotate the washing tub at a speed set higher than the resonance speed range to remove the wash water remaining in the fabric. By further removing it, there is an effect of reducing the dehydration load.

In addition, since the amount of wash water discharged during the dehydration process varies depending on the moisture content of the fabric, dehydration deviation may occur. do. Therefore, during the subsequent dehydration, the variation in moisture content according to the fabric is improved, which has the effect of guaranteeing a homogeneous dehydration performance.

1 is a side cross-sectional view showing a washing machine according to an embodiment of the present invention.
FIG. 2 illustrates a water storage tank and a suspension of the washing machine of FIG. 1 .
3 is a view taken along BB in part A of FIG. 2 .
4 is a block diagram illustrating a control relationship between main components of a washing machine according to an embodiment of the present invention.
5 is a flowchart illustrating a method for controlling a washing machine according to an embodiment of the present invention.
6 is a graph illustrating a change in the rotational speed of the driving unit according to the control method of FIG. 5 , and in particular, shows a series of steps after step S4 of FIG. 5 .
7 shows an unequal pitch spring.
8 is a graph illustrating a change in damping force according to displacement of a water tank in the case of a suspension to which an unequal pitch spring is applied.

Advantages and features of the present invention, and methods for achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

1 is a side cross-sectional view showing a washing machine according to an embodiment of the present invention. FIG. 2 illustrates a water storage tank and a suspension of the washing machine of FIG. 1 . 3 is a view taken along line B-B in part A of FIG. 2 . 4 is a block diagram illustrating a control relationship between main components of a washing machine according to an embodiment of the present invention. Hereinafter, a washing machine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4 .

A washing machine according to an embodiment of the present invention includes a casing 1 constituting an external appearance, operation keys for receiving various control commands from a user, and a display for displaying information on the operating state of the washing machine to provide a user interface. It includes a control panel 11 provided, and a door 7 that is rotatably provided on the casing 1 to open and close an entrance hole (not shown) through which the cloth (or laundry) enters and exits.

A water storage tank 2 containing water is suspended inside the casing 1 by a suspension 30 . A washing tub 3 accommodating the cloth is rotatably provided in the water storage tub 2 , and a pulsator 4 is rotatably provided at the bottom of the washing tub 3 . A plurality of holes are formed in the washing tub 3 so that washing water is exchanged between the washing tub 3 and the water storage tub 2 .

The suspension 30 is for suspending the water storage tank 2 in the casing 1, one end connected to a fixed part outside the water storage tank 2, and a support rod 31 having a base 33 at the other end and , a cap 32 that supports the water storage tank 2 and is movably provided along the support rod 31, the lower end is supported by the base 33, and the upper end is an elastic member that supports the cap 32 ( 35) may be included. The elastic member 35 may be a compression spring that is compressed when the water storage tank 2 moves downward by vibration.

The fixed part outside the water tank 2 connected to one end of the support rod 31 may be fixed to the casing 1, for example, a panel, frame, bracket, etc. constituting the casing 1 can be configured. It is preferable that the support rod 31 is rotatably connected to a fixed part outside the water storage tank 2 .

The cap 32 includes a cap body 32a that provides a space in which the elastic member 35 is accommodated, a seating part 32b defining an upper end of the cap body 32a and on which the water storage tank 2 is seated; It may include a spout 32c through which the support rod 31 passes inwardly into the tube protruding upward from the seating portion 32b.

A suspension mounting part 21 that protrudes from the outer circumferential surface of the water storage tank 2 and is supported by the cap 32 may be formed. The suspension mounting unit 21 includes a support plate 21a protruding to the outside of the water storage tank 2, and the spout 32c of the cap 30 passes through the support plate 21a, but the seating portion 32b does not pass. The opening 21c may be formed in size. Since the load acts from the water tank 2, the cap 32 and the water tank 2 are always moved integrally even in the vibration process.

On the other hand, a pair of ribs 21c may extend downwardly from the support plate 21a to surround the cap body 32a, and a gap is provided between the pair of ribs 21c, The support rod 31 can be inserted from the lateral direction through.

The casing 1 may include a cabinet 12 having an opened upper side, and a top cover 14 provided on the upper side of the cabinet 12 and having an entrance hole through which laundry enters and exits at a substantially central portion. The water supply passage 5 is connected to an external water source such as a faucet to supply water supplied into the water storage tub 2 and/or the washing tub 3 .

The control panel 11 may include an input unit 110 that receives a selection of preset courses from a user. The controller 42 may control the motor driving unit 320 according to the course selected through the input unit 110 .

The driving unit 30 drives the washing tub 3 and/or the pulsator 4 . The driving unit 30 may include a motor that provides a rotational force and a clutch mechanism that selectively transmits the rotational force of the motor to the washing tub 3 and the pulsator 4 under the control of the controller 42 to be described later. The motor of the driving unit 30 is preferably speed controllable, for example, a BLDC motor (Brushless DC motor).

The motor is connected to a spin-drying shaft and a washing shaft having a common center of rotation. The washing shaft transmits rotational force to the pulsator 4, and the spin-drying shaft transmits rotational force to the washing tub 3, and by an appropriate operation of the clutch mechanism, the washing shaft is separated from the spin-drying shaft. When the motor rotates, only the pulsator 4 is rotated by the washing shaft, and when the motor rotates in a state in which the washing shaft and the dehydration shaft are engaged, the pulsator 4 and the washing tub 3 are rotated together.

The drain pump 10 drains the wash water from the water storage tank 2 . When the drain pump 10 is operating, the wash water discharged from the water storage tank 2 flows along the drain passage 9 and is drained to the outside of the washing machine.

The control unit 42 controls the overall operation of various components such as the driving unit 41, the drain pump 10, and the water supply valve 6 constituting the washing machine. The operation of the water supply valve 6 , the driving unit 41 , and/or the drain pump 10 may be controlled according to the detection result of ( 44 ).

The laundry amount sensing unit 43 detects the laundry weight. While the washing tub 3 is rotating at a low speed, the amount of laundry is detected by the laundry weight detection unit 43 . The laundry weight detection unit 43 may calculate the amount of laundry by sensing a load applied to the motor of the driving unit 41 . For example, when controlling the washing tub 3 to rotate at a predetermined laundry weight detection speed, a greater current should be applied to the motor of the driving unit 41 as the amount of laundry increases. (41) The amount of laundry can be calculated based on the current value applied to the motor. In addition to this, various methods for detecting the amount of laundry are already well known in the field of washing machine technology, and the laundry weight detection unit 43 may sense the amount of laundry in such a known method.

The eccentricity detecting unit 44 detects the degree of bias in the washing tub 3 , that is, the eccentricity. The amount of eccentricity may be determined based on a change in the rotational speed of the motor or a change in the magnitude of the current applied to the driving unit 41 while the motor of the driving unit 41 is controlled to rotate at a constant speed. For example, while the driving unit 41 is controlled so that the washing tub 3 rotates at 120 rpm, the eccentricity detecting unit 44 detects the actual rotation speed of the washing tub 3 through a speed detector (not shown) (or, The amount of change in the driving unit 41 (rotation speed of the motor) may be obtained, and the amount of eccentricity may be determined based on this. The amount of eccentricity is preferably detected while the position of the cloth in the washing tub 3 is fixed. In the above example, at 120 rpm, the cloth is attached to the inner surface of the washing tub 3 by centrifugal force and is integral with the washing tub 3 It is higher than the speed at which it starts to rotate, and it is taken at a range lower than the speed at which resonance occurs. In this embodiment, in the washing machine in which resonance occurs mainly in the vertical direction in the section in which the washing tub 3 is rotated at a speed of 180 to 400 rpm, the eccentricity amount detected by the eccentricity detection unit 44 while the washing tub 3 is rotated at 120 rpm to detect However, it is not necessarily limited thereto, and since the speed section at which resonance occurs also varies when the natural frequency of the washing machine is changed according to the embodiment, taking this into consideration, the speed is lower than the speed section at which resonance occurs, but the laundry tub (3) rotates the washing tub 3 above the speed at which it starts to rotate integrally in a state of being attached to the inner surface of (3), and while the washing tub 3 is rotated in this way, the eccentricity detection unit 44 can detect the eccentricity .

In addition to this, various methods for detecting the amount of eccentricity are well known in the field of washing machine technology.

A washing method according to an embodiment of the present invention includes the steps of draining the water storage tank 2, accelerating the washing tub 30 to a pre-dehydration pre-treatment speed set below the resonance speed range in which resonance occurs, and then performing the de-watering pre-treatment speed for a certain period of time. and rotating the washing tub 3 at a dehydration speed higher than the dewatering pretreatment speed.

5 is a flowchart illustrating a method for controlling a washing machine according to an embodiment of the present invention. 6 is a graph illustrating a change in the rotational speed of the driving unit according to the control method of FIG. 5 , and in particular, shows a series of steps after step S4 of FIG. 5 . Hereinafter, a method of controlling a washing machine according to an embodiment of the present invention will be described with reference to FIGS. 5 to 6 .

After the cloth is put into the washing tub 3 , washing ( S2 ) and spin-drying ( S9 ) are sequentially performed according to the settings selected through the control panel 11 . Here, the washing (S2) refers to a process of supplying washing water into the washing tub 3 to remove contamination of the fabric, and may be either a washing cycle using detergent or a rinsing cycle to remove the detergent from the fabric, In addition, the dehydration (S9) is sufficient as long as the washing tub 3 is rotated at high speed to remove the water from the cloth after draining the water storage tank 2, and it may be a dehydration cycle distinct from the washing or rinsing cycle. Instead, it may be carried out after drainage within each stroke.

Sensing the amount of dry laundry ( S1 ) is a step of detecting the amount of laundry put into the washing tub ( 3 ). Since it is before washing (S2), the amount of laundry is sensed in the dry state. The control unit 42 controls the motor of the driving unit 41 to accelerate to reach the laundry weight detection speed (rpm A, for example, 30 rpm), and to rotate at the laundry weight detection speed for a certain period of time. During this process, the weight detection unit 43 ) to detect the amount of laundry.

Washing (S2) is performed by supplying water into the water storage tub 2 through the control of the water supply valve 6 and rotating the washing tub 3 and/or the pulsator 4 according to a preset pattern. is put in and the contamination of the cloth is removed. The amount of water supplied during washing (S2) and the rotation pattern of the washing tub 3 and/or the pulsator 4 may be set according to the amount of laundry.

After washing is completed, drainage (S3) is performed. The drain pump 10 is operated to discharge the wash water contained in the water storage tub 2 to the outside of the washing machine through the drain passage 9 . A water level detection mechanism (not shown) for sensing the water level in the water storage tank 2 may be further provided, and in this case, the control unit 42 detects that the water level in the water storage tank 2 has reached the empty water level by the water level detection mechanism, and drains the water. Stop the operation of the pump (10).

After draining (S3), the amount of laundry is detected again (S4). Step S4 detects the amount of laundry in substantially the same way as in step S1, but there is a difference in that the amount of laundry is sensed while the cloth is wet due to washing (S2). In step S4, the control unit 42 controls the motor of the driving unit 41 to accelerate to reach the laundry weight detection speed (rpm A, for example, 30 rpm), and to rotate at the laundry weight detection speed for a certain period of time (t1 to t2 in FIG. 6). control, and in this process, the laundry weight is sensed by the laundry weight detection unit 43 . Hereinafter, the amount of laundry detected in step S4 is referred to as a dewatering amount (LW).

Step S5 is a step of comparing the amount of de-foaming (LW) detected in step S4 with a preset reference amount (LW0). Based on the comparison result in this step, it is determined whether or not to perform the dehydration pretreatment (S8), which will be described later. Here, it is preferable that the reference laundry amount LW0 is set in consideration of the amount of vibration generated during dehydration (S9) performed later. If the amount of laundry is less than a certain level, even if vibration is induced during spin-drying, it does not affect the durability of the washing machine. That is, it is preferable that the reference laundry weight LW0 is set within a range that does not cause problems in various aspects such as the load and vibration applied to the driving unit 41 during the dewatering (S9) process even if the pre-dehydration treatment (S8) is omitted. . When the amount of laundry is relatively small, the total time required for laundry treatment can be reduced by omitting the pre-dehydration treatment (S8) and immediately performing the dehydration (S9).

On the other hand, after the laundry amount is detected in step S4, the control unit 42 accelerates the washing tub 3 to the eccentricity detection speed (rpm B, for example, 120rpm), and for a certain period of time (t3 to t4), the eccentricity detection speed Control the driving unit 41 to rotate. While the washing tub 3 is rotated at the eccentricity sensing speed, the eccentricity is detected by the eccentricity detecting unit 44 (S6, S51). In the embodiment, the eccentric amount detection steps (S6, S51) were performed in any case (yes or no) regardless of the comparison result in step S5, but when the reference laundry amount (LW0) is set lower, eccentricity detection in step S51 may be omitted.

Step S7 is a step of comparing the amount of eccentricity (UB) detected in step S6 with a reference eccentricity (UB0), and step S52 is a step of comparing the amount of eccentricity (UB) detected in step S51 with a reference eccentricity (UB0). When it is determined that the eccentricity amount UB is greater than the reference eccentricity amount UB0 in step S7 or S51, the control unit 42 controls the motor of the driving unit 41 to be stopped (S71, a decrease section after t4 in FIG. 6 ) ), after which the dewatering amount detection step (S4) is performed again.

On the other hand, when it is determined in step S7 that the eccentricity UB is equal to or less than the reference eccentricity UB0, the dehydration pretreatment step S8 is performed. In the dehydration pretreatment step (S8), the controller 42 accelerates the rotational speed of the washing tub 3 from the eccentricity detection speed (rpm B) to the dehydration pretreatment speed (rpm C, for example, 170rpm), and then the dehydration pretreatment speed to control the driving unit 41 to rotate for a predetermined time (t5 to t6). The dehydration pretreatment speed is set below the resonance speed range in which resonance occurs due to the rotation of the washing tub 3, and the washing machine according to this embodiment has a resonance speed range between 180rpm and 400rpm, and the dehydration pretreatment speed is preferably was set between 120 rpm and 180 rpm. In particular, since a conventional washing machine has a limited amount of clothes that can be put in, the resonance speed range is also limited, and it is approximately 180 rpm to 400 rpm. Therefore, when the spin-drying pre-treatment speed is set between 120 and 180 rpm, resonance can be avoided even when the spin-drying pre-treatment ( S8 ) is performed in most washing machines.

Meanwhile, in the dehydration pretreatment step (S8), the drain pump 10 is operated while the washing tub 3 is rotating, so that the wash water dehydrated from the cloth is discharged through the drain passage 8 .

The pre-dehydration treatment (S8) is to dehydrate the fabric in advance after the drainage (S3) and before the dehydration (S9). In particular, in step S5, the dewatering amount (LW) is greater than the reference amount (LW0). have. In the case of a large amount of dewatering (LW), the load acting on the driving unit 41 during dehydration (S9) is greater, and since the amount of wash water discharged during dehydration (S9) is large, the state of the fabric changes (especially moisture) is severe. Such a change in the state of the fabric is also a factor in generating an unexpected situation (eg, excessive vibration) during dehydration (S9). Therefore, if the dewatering amount (LW) is large, by performing dehydration pretreatment (S8) in advance below the resonance speed range and then performing dehydration (S9), homogeneous dewatering (S9) performance within the expected range can be secured. can have an effect.

Meanwhile, according to an embodiment, the dehydration pretreatment (S8) may be performed according to the amount of raisin detected in step S1. Although the correlation between the amount of raisins and the amount of de-foaming may decrease depending on the ability of the cloth to contain moisture, since the amount of dry cloth and the amount of de-foaming are generally proportional to each other, the amount of dry cloth detected in step S1 instead of the amount of de-foaming in step S5 is used. Even if it is applied, it is not a big problem.

Meanwhile, the control unit 42 can set the time (t5 to t6) for which the rotation of the washing tub 3 is controlled at the dehydration pretreatment speed (rpm C) according to the dewatering amount (LW, or the amount of raisin detected in step S1). have. That is, in FIG. 6 , the time period between t5 and t6 may be set longer as the amount of de-foaming (or the amount of dry cloth) increases.

After the dehydration pretreatment (S8), dehydration (S9) is performed. After accelerating the rotation speed of the washing tub 3 from the spin-drying pre-treatment speed (rpm C) to the preset spin-drying speed (rpm D), the control unit 42 controls the driving unit 41 to rotate at the spin-drying speed for a certain period of time. can Also, during dehydration ( S9 ), the drain pump 10 is operated, and the wash water discharged from the water storage tank 2 is discharged through the drain passage 8 .

7 shows an unequal pitch spring. 8 is a graph illustrating a change in damping force according to displacement of a water tank in the case of a suspension to which an unequal pitch spring is applied. 7 to 8 , in the washing machine according to another embodiment of the present invention, the elastic member constituting the suspension 30 may be an unequal pitch spring 350 .

The unequal pitch spring 350 may include a first section 351 extending with a constant pitch P1 and a second section 352 having a different pitch P2 from the first section 351 . According to the embodiment, the unequal pitch spring 350 may have more sections in which the pitch is different from the adjacent section, and in this embodiment, a third section 353 is further formed below the second section 352, and the second section The pitch in the third section 353 may be the same as that of the first section 351 , but is not necessarily limited thereto. It is preferable that the pitch P2 in the second section 352 has the largest value among the first section 351 , the second section 352 , and the third section 353 .

When the displacement of the washing tub 3 due to vibration (hereinafter, 'displacement' is defined as the distance moved from the position of the washing tub 3 in a stationary state) is less than a certain value, the unequal pitch spring 350 is mainly the pitch. The second section 352 with a large This is performed by the first section 351 or the third section 353 having a small pitch. In FIG. 8 , K1 denotes the elastic modulus in the second section 352 , and K2 denotes the elastic modulus in the first section 351 and the third section 353 .

8 shows that when the dehydration pretreatment (S8) is not performed as in the prior art, the buffer was made by the first section 351 or the third section 353 having an elastic modulus of K2 at the start of the dehydration (S9) (at this time, the dehydration The load is LW1), and in this embodiment, since dewatering (S9) starts with the dewatering load reduced from LW1 to LW2 by performing the dewatering pretreatment (S8) in this embodiment, the elastic modulus at the start of dehydration (S9) is K1 (K1) It shows that the buffer is buffered by the second section 352 of <K2). That is, the washing machine according to the present embodiment applies an unequal pitch spring, so that a section with a low elastic modulus contributes to vibration damping at the start of dehydration (S9), so that a soft buffering action is made, and thereafter, dehydration (S9) Even if a larger vibration is generated while , it can leave room for additional vibration to be attenuated by the first section or the third section (modulus of elasticity K2) that provides a stronger cushioning force, so more delicate buffering according to the size of the vibration It has the effect of making it work. In particular, it is preferable that the dewatering load at the time when the dehydration (S9) starts after the completion of the dehydration pretreatment (S8) is such that the second section 352 is not voltage-bonded. The rotation times t5 to t6 need to be set appropriately.

Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims described below rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. should be interpreted

Claims (20)

A method for controlling a washing machine comprising: a water storage tub containing wash water;
(a) draining the water tank;
(b) accelerating the washing tub to a pre-dehydration pre-treatment speed set below the resonance speed range in which resonance occurs, and then rotating the washing tub at the de-watering pre-treatment speed for a certain period of time;
(c) rotating the washing tub at a dehydration speed higher than the dehydration pretreatment speed; and
(d) detecting the amount of laundry in the washing tub;
Step (b) is a control method of a washing machine that is performed when the amount of laundry detected in step (d) exceeds a preset reference amount. delete The method of claim 1,
Step (d) is,
A method of controlling a washing machine performed after step (a). delete The method of claim 1,
When the amount of laundry detected in step (d) is less than or equal to a preset reference amount, step (c) is not performed and step (c) is performed. The method of claim 1,
(e) rotating the washing tub at a speed set at a lower speed than the dewatering pretreatment speed, and detecting the eccentricity by rotating the washing tub at an eccentricity sensing speed at which the laundry is rotated integrally with the washing tub by centrifugal force;
Step (b) is,
A control method of a washing machine performed when the amount of eccentricity detected in step (e) is less than or equal to a preset reference eccentricity. The method of claim 1,
The time during which the washing tub rotates in step (b) is,
A control method of a washing machine set according to the amount of laundry detected in step (d). 8. The method of claim 7,
The time during which the washing tub rotates in step (b) is,
A method of controlling a washing machine in which the larger the amount of laundry detected in step (d), the longer it is set. The method of claim 1,
The control method of the washing machine wherein the dehydration pretreatment speed is 120 to 180 rpm. A method for controlling a washing machine comprising: a water storage tub containing wash water;
It is carried out after removing contamination of laundry by supplying water to the water storage tank;
drain the reservoir;
detecting the amount of laundry in the washing tub;
Rotating the washing tub at an eccentricity sensing speed that is less than a resonance speed range at which resonance is generated by rotation of the washing tub, but at which the cloth is rotated integrally with the washing tub by centrifugal force, and detects the amount of eccentricity;
When the sensed laundry amount exceeds the preset reference weight, the washing tub is rotated for a certain period of time at a dehydration pretreatment speed higher than the eccentricity detection speed but lower than the resonance speed range, and then at a dehydration speed higher than the dewatering pretreatment speed. rotating the washing tub;
and rotating the washing tub at a dehydration speed higher than the dehydration pretreatment speed immediately when the sensed laundry amount is less than or equal to a preset reference laundry weight. a cistern containing washing water;
a washing tub that accommodates the cloth and is rotatably provided in the water storage tub;
a driving unit for rotating the washing tub;
a drain pump for draining the water tank;
a laundry weight sensing unit for detecting the amount of laundry in the washing tub; and
After the washing tub is accelerated to a pre-dehydration speed set below the resonance speed range in which resonance occurs, the driving unit is controlled to rotate at the spin-drying pre-treatment speed for a certain period of time, and while the washing tub is rotated at the spin-drying pre-treatment speed, the drain A control unit for controlling the pump to operate, and controlling the driving unit so that the washing tub rotates at a dehydration speed higher than the dehydration pretreatment speed after the predetermined time has elapsed,
The accelerating of the washing tub to the dehydration pretreatment speed is performed when the amount of laundry sensed by the laundry weight detection unit exceeds a preset reference weight. delete 12. The method of claim 11,
The control unit is
After the water storage tub is drained, the washing machine accelerates the washing tub to the dewatering pretreatment speed according to the laundry weight sensed by the laundry weight sensing unit. delete 12. The method of claim 11,
The control unit is
and omitting controlling the washing tub to rotate at the spin-drying pretreatment speed when the amount of laundry sensed by the laundry weight sensing unit is equal to or less than the reference laundry weight, and controlling the driving unit to rotate the washing tub at the spin-drying speed. 12. The method of claim 11,
Further comprising an eccentricity detection unit for detecting the amount of eccentricity caused by the bias of the fabric in the washing tub,
The control unit is
When the amount of eccentricity detected by the eccentricity detection unit is less than or equal to a preset reference eccentricity, the washing machine controls the washing tub to accelerate to the spin-drying pretreatment speed. 12. The method of claim 11,
The control unit is
The washing machine sets a time for which the washing tub rotates at the spin-drying pretreatment speed according to the amount of laundry detected by the laundry weight detection unit. 18. The method of claim 17,
The time the washing tub rotates at the dehydration pretreatment speed is,
A washing machine set to be longer as the amount of laundry detected by the laundry weight sensing unit increases. 12. The method of claim 11,
The washing machine in which the dehydration pretreatment speed is controlled at 120 to 180 rpm. 12. The method of claim 11,
Further comprising a suspension for buffering the vibration of the water tank,
The suspension is
It dampens vibration by being compressed according to the displacement of the water tank according to the vibration, and includes an unequal pitch spring having a section with a relatively large pitch and a section with a small pitch,
The unequal pitch spring is
When the washing tub starts to rotate at a spin-drying speed higher than the spin-drying pretreatment speed, a section having a large pitch performs a vibration damping function.

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