KR102493158B1 - Method for controlling washing machine - Google Patents

Abstract

The present invention relates to a control method for a washing machine, comprising: spin-drying laundry by rotating a drum after washing laundry; determining the amount of bubbles generated in a drum or/and tub; and rotating the drum while supplying water to wash laundry. Including the step of rinsing, and when the determined amount of foam is greater than or less than the set value, the rotation pattern of the drum is performed differently in the rinsing step.

Description

Method for controlling washing machine {Method for controlling washing machine}

The present invention relates to a control method of a washing machine, and more particularly, to a drum type washing machine in which a tub is automatically washed.

In general, a washing machine is a device that cleans clothes, bedding, etc. (hereinafter referred to as 'laundry') through processes such as washing, rinsing, and dehydration using water, detergent, and mechanical action to remove stains. .

Washing machines are largely classified into agitator type, pulsator type, and drum type washing machines.

The agitation type rotates the washing rod rising from the center of the tub to the left and right, and the vortex type rotates the disk-shaped rotary blades formed at the bottom of the tub to the left and right to wash using the frictional force between the water flow and the laundry. Wash by adding water, detergent and laundry and rotating the drum.

In a drum type washing machine, a tub for accommodating water is mounted inside a cabinet forming an exterior, a drum for accommodating laundry is disposed inside the tub, a drive unit for rotating the drum is mounted on the rear side of the tub, and a drive unit for rotating the drum is mounted on the rear side of the tub. A drive shaft passing through the tub and connected to the rear side of the drum is built up. A lifter is installed inside the drum to lift the laundry when the drum rotates.

Mold and contaminants are generated and adhered to the drum and tub of the drum type washing machine due to residual water and detergent residue. There are problems in that odors are generated and laundry is contaminated due to mold and contaminants adhering to the drum and the tub.

A first problem to be solved by the present invention is to provide a control method of a washing machine in which the front and rear surfaces of the drum and the tub are evenly washed in order to wash mold or contaminants adhering to the drum and the tub.

A second object of the present invention is to provide a control method for a washing machine that prevents bubbles from flowing backward through an air vent provided in a tub when washing a tub and a drum, as disclosed in the first task.

A third object of the present invention is to provide a control method of a washing machine for determining the amount of bubbles in a tub to prevent foam backflow, which is disclosed in the second object.

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

A method for controlling a washing machine according to the present invention for realizing the above objects includes: spin-drying laundry by rotating a drum after washing laundry; determining the amount of bubbles generated in a drum or/and a tub; supplying water while A step of rinsing the laundry by rotating the drum is included, and when the determined amount of foam is greater than or less than a set value, a rotation pattern of the drum is different in the rinsing step.

In the dewatering step, the rotational speed acceleration section, constant speed section, and deceleration section of the drum are sequentially provided, and if the deceleration slope in the deceleration section is greater than the set slope, it can be determined that the amount of foam is greater than the set value.

If the maximum rotational speed of the drum is less than the set speed value, it can be determined that the amount of bubbles is greater than the set value.

In the dehydration step, the small dehydration step in which the rotation of the drum is accelerated and then decelerated is repeatedly performed, and the maximum rotational speed of the drum may be higher in the small dehydration step performed later than in the small dehydration step performed immediately before, when viewed from time to time. .

Among the plurality of small dehydration steps, the slope of the rotational deceleration section of the drum in a predetermined small dehydration step may be measured, and if the measured slope is greater than the set slope, it may be determined that the amount of bubbles is greater than the set value.

Among the plurality of small dehydration steps, the slope of the rotational deceleration section of the drum is measured in the final small dehydration step, and if the measured slope is greater than the set slope, it can be determined that the amount of bubbles is greater than the set value.

The slope of the rotational deceleration section of the drum in the final small dehydration step and the previous small dehydration step among the plurality of small dehydration steps is measured, and if the measured slope is greater than the set slope, the amount of foam is determined to be greater than the set value Washing machine control method.

If the maximum rotational speed of the drum in the final minor dehydration step is less than the set speed value, it can be determined that the amount of foam is greater than the set value.

If the slope of the deceleration section in the minor dehydration step is greater than the set slope and the maximum rotational speed of the drum in the final minor dehydration step is less than the set speed value, it can be determined that the amount of foam is greater than the set value.

At the beginning of the rinsing step, when the determined amount of foam is less than the set value, the drum can be continuously rotated for a longer period of time than when it is greater than or equal to the set value.

At the beginning of the rinsing step, when the determined amount of foam is less than the set value, the rotational speed of the drum may be higher than when it is greater than or equal to the set value.

At the beginning of the rinsing step, when the determined amount of foam is less than the set value, the laundry may adhere to the inner circumferential surface of the drum and rotate together with the drum when water is supplied.

At the beginning of the rinsing step, when the determined amount of foam is less than the set value, after water supply is finished, the drum may rotate so that the water contained in the tub touches the entire front and rear surfaces of the tub.

After water supply is finished, if the value of the water level sensor provided in the tub exceeds the set value, it is determined that the amount of bubbles is greater than the set value, and the rotation pattern of the drum can be changed accordingly.

The control method of the washing machine according to the present invention provides an effect of enhancing washing performance by increasing the rotational speed of the drum so that the water contained in the tub reaches the entire front and rear surfaces of the tub through rotation.

In addition, the control method of the washing machine according to the present invention provides an effect of preventing foam from flowing backward through an air vent in advance by performing a rinsing process instead of a washing process when there is a lot of foam.

In addition, the washing machine control method according to the present invention provides an effect of indirectly determining the amount of bubbles in the tub through the deceleration slope and maximum speed of the drum during the spin-drying process.

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

1 is a perspective view of a washing machine according to an embodiment of the present invention.
2 is a cross-sectional view of the washing machine shown in FIG. 1;
3 is a schematic diagram of determining the amount of bubbles according to an embodiment of the present invention.
Figure 4 is a flow chart disclosing in more detail the method of determining the amount of foam shown in Figure 3;
5 is a view showing dehydration and rinsing steps when the amount of foam is determined to be small.
6 is a view showing dehydration and rinsing steps when the amount of foam is determined to be large.

The embodiments described below are shown by way of example to aid understanding of the invention, and it should be understood that the present invention may be variously modified and implemented differently from the embodiments described herein. However, in the description of the present invention, if it is determined that a detailed description of a related known function or component may unnecessarily obscure the subject matter of the present invention, the detailed description and detailed illustration thereof will be omitted. In addition, the accompanying drawings are not drawn to an actual scale to aid understanding of the present invention, and the dimensions of some components may be exaggerated.

The first and second terms used in this application may be used to describe various components, but the components should not be limited by the terms. Terms are only used to distinguish one component from another.

In addition, terms used in this application are only used to describe specific embodiments, and are not intended to limit the scope of rights. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "comprise", "consist of" or "consist of" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or It should be understood that it does not preclude the possibility of the presence or addition of more other features, numbers, steps, operations, components, parts, or combinations thereof.

In addition, terms related to direction used in this application, for example, up, down, left, right, front, rear, clockwise, counterclockwise, etc., refer to the relative arrangement position or movement of the components shown in the drawings. It is to be understood that for purposes of illustration a direction does not exclude other directions.

1 is a perspective view of a washing machine according to an embodiment of the present invention. 2 is a cross-sectional view of the washing machine shown in FIG. 1;

A washing machine according to an embodiment of the present invention includes a casing 10 forming an exterior, a tub 31 accommodating water, a drum 32 disposed in the tub to receive and rotate laundry, and the drum. A rotating driving unit 38, a water supply unit 33 that controls the inflow of water from an external water source, a dispenser 35 that accommodates detergent and mixes water with the detergent, and discharges water from the tub 31 to form a tub ( 31) a pump 136 that circulates in or drains to the outside.

The casing 10 forms the exterior of the washing machine, and an inlet 12h into which laundry is input is formed on the front side. The casing 10 may include a cabinet 11 having an open front, left side, right side, and rear surface, and a front panel 12 coupled to the open front side of the cabinet 11 and having an inlet 12h formed therein. can The lower and upper surfaces of the cabinet 11 are open, and a horizontal base 15 supporting the washing machine may be coupled to the lower surface. In addition, the casing 10 may further include a top plate 13 covering the open upper surface of the cabinet 11 and a control panel 14 disposed above the front panel 12 . The control panel 14 may include an input unit 14b for receiving various operation commands such as selection of a laundry course or operation time and reservation for each cycle through a user, and a display unit 14a for displaying the operating state of the washing machine. there is.

A tub 31 containing water may be disposed in the casing 10 . The tub 31 is formed in a cylindrical shape with circular front and rear surfaces so that laundry can be put therein. The tub 31 has an inlet formed on the front surface of the circular shape, and the inlet communicates with the inlet 12h formed in the casing 10 by the gasket 60 . An air vent 31a through which air is circulated is formed on the upper side of the tub 31 .

The door 20 for opening and closing the inlet 12h may be rotatably coupled to the casing 10 . The door 20 may include a door frame 21 having an open central portion and rotatably coupled to the front panel 12 , and a transparent window 22 installed in the open central portion of the door frame 21 . there is.

The gasket 60 is to prevent water contained in the tub 31 from leaking. The front end is coupled to the front surface of the casing 10 (or the front panel 12), the rear end is coupled to the circumference of the inlet of the tub 31, and a tubular shape extends between the front and rear ends. The gasket 60 may be made of a material having flexibility or elasticity. The gasket 60 may be made of natural rubber or synthetic resin.

A drum 32 accommodating laundry may be rotatably provided in the tub 31 . The drum 32 is formed in a cylindrical shape with circular front and rear sides to accommodate laundry, and is disposed so that an inlet through which laundry is input is located on the front side. The drum 32 is rotated about an approximately horizontal centerline of rotation C. However, "horizontal" here is not a term used in a mathematically strict sense. That is, when the rotation center line C is inclined at a predetermined angle (eg, 5 degrees or less) with respect to the horizontal as in the embodiment, since it is also close to the horizontal, it can be said to be approximately horizontal. A plurality of through holes may be formed in the drum 32 so that water in the tub 31 may flow into the drum 32 . A lifter 32a may be disposed on an inner circumferential surface of the drum 32 to lift the laundry to a predetermined height when rotating.

The driving unit 38 for rotating the drum 32 may include a motor, a switching element for controlling it, a clutch, and the like. The driving shaft 38a rotated by the driving unit 38 may pass through the rear surface of the tub 31 and be coupled to the drum 32 . The motor of the drive unit 38 may include a stator fixed to the rear of the tub 31 and a rotor rotated by a magnetic force acting between the stator and the stator. The driving shaft 38a may rotate integrally with the rotor.

The tub 31 may be supported by a damper 16 installed on the base 15 . Vibration of the tub 31 caused when the drum 32 rotates is damped by the damper 16 . Although not shown, according to embodiments, a hanger (eg, a spring) for suspending the tub 31 within the casing 10 may be further provided.

At least one water supply hose (not shown) for guiding water supplied from an external water source such as a faucet to the tub 31 and a water supply unit 33 for controlling the at least one water supply hose may be provided.

A dispenser 35 may be provided to supply additives such as laundry detergent and fabric softener into the tub 31 or the drum 32 . In the dispenser 35, additives may be classified according to their types and accommodated in a plurality of accommodating units.

At least one water supply pipe 34 may be provided to selectively guide water supplied through the water supply unit 33 to each accommodation unit of the dispenser 35 . The water supply unit 33 may include at least one water supply valve that regulates each water supply pipe 34 .

The gasket 60 may be provided with a direct water nozzle 42 for spraying water into the drum 32, and a direct water supply pipe 39 for guiding the water supplied through the water supply unit 33 to the direct water nozzle 42 may be provided. The water supply unit 33 may include a water supply valve that regulates the direct water supply pipe 39 .

Water discharged from the dispenser 35 is supplied to the tub 31 through the water supply bellows 37 . A water supply port (not shown) connected to the water supply bellows 37 may be formed in the tub 31 .

A drain hole for discharging water may be formed in the tub 31 , and a drain bellows 17 may be connected to the drain hole. A pump 36 for pumping water discharged through the drain bellows 17 may be provided.

The pump 36 may selectively perform a function of pumping water discharged through the drain bellows 17 to the drain pipe 19 and a function of pumping the water discharged through the drain bellows 17 to the circulation pipe 18 to be described later. However, it is not limited to this, and a circulation pump for pumping the water discharged from the tub 31 to the circulation pipe 18 and a drain pump for pumping the water discharged from the tub 31 to the drain pipe 19 may be provided separately. can Hereinafter, water that is pumped by the pump 36 and guided along the circulation pipe 18 is referred to as circulating water.

The pump 36 may include an impeller (not shown) for pumping water, a pump housing (not shown) in which the impeller is accommodated, and a pump motor (not shown) for rotating the impeller.

A circulation nozzle 71 for injecting circulation water into the drum 32 may be provided in the gasket 60 . The circulation nozzle 71 is connected to the circulation pipe 18 and injects water (circulating water) circulated by the pump 36 into the drum 32 .

Hereinafter, the entire process of a control method of a washing machine according to an embodiment of the present invention will be schematically described.

The washing process is a process in which laundry is wetted with water mixed with laundry detergent and then the drum is rotated to remove contaminants from the laundry. The washing process proceeds in the steps of water supply, fabric treatment, drainage, fabric dispersion and minor dehydration. Water supply is a step of supplying water from an external water source into the tub and soaking laundry with water mixed with laundry detergent. When water is supplied, the amount of laundry, the amount of laundry, can be detected. The cloth treatment is a step of removing contamination from the laundry by rotating the drum at various speeds and/or directions to apply a mechanical force such as a tensile force, a frictional force, or an impact force to the laundry. Drainage is a step of discharging water in the tub to the outside of the casing. The fabric dispersion is a step in which noise and vibration due to the eccentricity of the laundry are not generated during small spin-drying by repeating acceleration and deceleration of the drum to disperse the laundry.

Small dehydration, also called simple dehydration, is a step in which the drum is rotated at high speed to allow the water soaked in the laundry to escape. When the drum rotates at high speed during small dehydration, the laundry adheres to the inner circumferential surface of the drum and rotates, and the laundry is spin-dried by the centrifugal force. Small dehydration may be performed several times, and small dehydration according to an embodiment of the present invention may be performed three times. However, it is not limited to three times in the number of times of small dehydration, and other times of small dehydration may be performed.

The rinse process is a process of soaking the laundry in water and then rotating the drum to remove residual laundry detergent from the laundry. In the rinse cycle, the fabric softener can be mixed with water and applied to the laundry. Like the washing process, the rinsing process proceeds in the steps of water supply, fabric treatment, drainage, fabric dispersion, and minor dehydration. In the rinse cycle, the cloth treatment is a step of removing residual detergent from the laundry by rotating the drum at various speeds and/or directions. Depending on the embodiment, the rinsing process may be repeatedly performed several times. The rinsing process may be performed after the washing process, or may be performed after the tub washing process to be described later.

The tub washing process is a process of washing the drum and the tub by rotating water accommodated in the tub. It is preferable that the tub washing cycle is performed after the washing cycle or after the rinsing cycle. A detailed description of the tub washing process will be described later.

The main spin-drying step is a step of finally spin-drying the laundry by rotating the drum at high speed. The main spin cycle proceeds to the steps of draining the water in the tub to the outside of the casing, distributing the laundry by repeating the drum's acceleration and deceleration, and final spin spin by rotating the drum at high speed to spin the laundry. . The maximum rotational speed of the drum in the final dewatering is higher than the maximum rotational speed of the drum in the minor dehydration.

3 is a schematic diagram of determining the amount of bubbles according to an embodiment of the present invention. Hereinafter, the determination of the amount of foam in the spin-drying step and the direction of the washing process according to the determination will be described.

When the drum 32 is rotated at a high speed in the spin-drying step after draining the wash water during the washing or rinsing step, a predetermined amount of foam may be generated by detergent ingredients remaining in the fabric. At this time, when excessive bubbles are generated, the bubbles leak into the air vent 31a, which is an air flow passage provided on the upper side of the tub 31, and there is a concern about safety accidents due to corrosion of peripheral parts or electric leakage. Therefore, the control method according to the present invention can secure the reliability of the washing machine and prevent safety accidents through the method of preventing leakage of bubbles into the air vent.

In order to prevent leakage of foam, it is important to first determine the amount of foam in the dewatering process. Therefore, in the dehydration step, the amount of foam generated is detected (S1), and the amount of foam is determined accordingly (S2). When the amount of foam is large, a general rinse cycle is performed (S5), and the amount of foam is In the case of a small amount, after the initial supply of water for rinsing and the tub washing process (S3), a general rinsing process is then performed (S4).

At the time of supplying water in the initial stage of rinsing and washing the barrel (S3), the rotational speed of the drum is faster than that of normal rinsing and continues to rotate for a long time, so if the amount of foam is relatively large, the foam may leak through the air vent , so that the possibility of foam leaking is prevented in advance, the above process (S3) is omitted and a general rinsing process is performed after the dehydration is completed (S5).

Figure 4 is a flow chart disclosing in more detail the method of determining the amount of foam shown in Figure 3;

Hereinafter, bubble detection and subsequent spin-drying and rinsing steps will be described in detail.

According to an embodiment of the present invention, the dehydration step is largely performed in the latter part of the rinsing cycle. The dewatering steps 110 and 210 include small dewatering steps 111, 112, and 113 in which the rotational speed of the drum 32 is accelerated, maintained for a predetermined time, and then decelerated. In the embodiment according to the present invention, the small dehydration step is performed three times, but the small dehydration step may be performed only once or more than three times.

For each small dehydration step, there is a section in which the rotational speed of the drum 32 is accelerated, a section in which the accelerated rotational speed is maintained, and a section in which the rotational speed is decelerated. At this time, the rotation deceleration slope of the drum is measured in the deceleration section .

At this time, the control method according to the embodiment of the present invention first measures the deceleration slope in the deceleration section in the small dehydration step 112 just before the final step. In addition, the deceleration slope in the dehydration step just before the final is compared with a preset slope value, and if the deceleration slope is greater than the set slope, it is determined that there are many bubbles, and if the deceleration slope is less than the set slope value, it is passed to the next determination step (S12). Go (S11).

After determining the amount of foam through the deceleration slope in the final minor dehydration step, the deceleration slope in the deceleration section in the final minor dehydration step (111) is measured. Then, the deceleration slope in the final dehydration step is compared with a preset slope value, and if the deceleration slope is greater than the set slope, it is determined that there are many bubbles, and if the deceleration slope is less than the set slope value, the next determination step (S13) is performed. (S12).

The reason why the amount of bubbles can be determined through the deceleration slope is that when a lot of bubbles are generated in the tub, the resistance caused by the bubbles increases when the drum rotates. This is because the deceleration slope increases.

In addition, rather than decelerating at low rpm, the deceleration slope at high rpm accurately reflects the resistance of the foam, and the maximum rotational speed of the drum in the speed maintenance section after acceleration during small dehydration increases as the dehydration step is performed, Determining the amount of foam according to the deceleration slope relative to the deceleration section in the minor dehydration step performed in the second half can more accurately determine the amount of foam.

In the embodiment according to the present invention, the amount of foam according to the deceleration slope in the final dehydration step and the dehydration step just before the final was determined, but only the amount of bubbles according to the deceleration slope in the final dehydration step may be determined, If the number of steps is one, the amount of foam according to the deceleration slope at that time may be determined, and when the small dehydration step is performed several times, the deceleration slope in the final small dehydration step and a plurality of small dehydration steps close to it may be determined. The amount of foam can also be determined.

After determining the amount of foam through the deceleration slope in the final minor dehydration step, the maximum rotational speed of the drum 32 in the final minor dehydration step is measured. And comparing the preset speed value with the maximum rotation speed value of the drum, if the maximum rotation speed value of the drum is less than the set speed value, it is determined that the amount of bubbles is large, and if the maximum rotation speed value of the drum is equal to or greater than the set speed value, It is determined that the amount of bubbles is small (S13).

The reason why the amount of foam can be determined by comparing the maximum rotational speed of the drum is that, when a lot of foam is generated in the tub, the target drum rotation rpm is not reached due to resistance of the foam. In addition, the reason for measuring the maximum rotational speed of the drum in the final small dehydration step is that as the small dehydration step is performed several times, the rotational speed in the speed maintenance section after acceleration gradually increases, which is the highest drum speed in the dehydration step in the final small dehydration step. Because it can have rotational speed.

If it is determined that the amount of foam is large, rinse water necessary for rinsing is supplied into the tub 31 (S18), and the drum 32 is rotated to repeat the rinsing process so that the laundry adheres to and separates from the inner circumferential surface of the drum (S19). )do.

When it is determined that the amount of foam is small, an initial water supply process of the rinsing step is performed (S14), and an initial tub washing process of the rinsing step is performed (S15). After the steps S14 and S15 are performed, the same steps S16 and S17 as the general rinsing steps S18 and S19 are performed. The initial water supply process of the rinsing step and the initial tub washing process of the rinsing step will be described later in detail.

5 is a view showing dehydration and rinsing steps when the amount of foam is determined to be small. 6 is a view showing dehydration and rinsing steps when the amount of foam is determined to be large.

Hereinafter, the rinsing step, which varies after the dehydration step according to the determined amount of foam, will be described.

As described above, while the small dehydration steps are sequentially performed (113,213) (112,212) (111,211), the maximum drum rotation speed in the final small dehydration step (111,211), the small dehydration step just before the final step (112,212) and the final small dehydration step (111,211) ), it is divided into cases where the amount of bubbles is greater than the set value and cases where the amount of bubbles is less than the set value, and rinsing after dehydration (110, 210) is performed according to each case process will be different.

First, looking at the case where the amount of foam is determined to be less than the set value, the water supply process 121 is performed while passing through the dehydration step 110 and entering the rinsing step 120. When water is supplied, the drum rotates at such a speed that the laundry adheres to the inner circumferential surface of the drum. This belongs to the filtration motion among drum rotation motions. By adhering to the inner circumferential surface of the drum, a predetermined space is formed in the center of the drum, so that bubbles formed in the predetermined space can be removed more effectively during drainage.

According to an embodiment of the present invention, the speed of the drum is formed at 108 rpm, and the speed can be flexibly set to an rpm at which laundry can rotate while adhering to the inner circumferential surface of the drum.

In addition, when the drum rotates, some water is supplied and then drained, and after the drain is completed, the remaining water is supplied. This is to remove bubbles in the tub through a draining process performed in the middle of supplying water, and to discharge high-concentration detergent water at the same time, and then perform a washing function through the water supplied again.

In this water supplying process, when the water level measured by the water level sensor reaches the target water level, the rotational speed of the drum is maintained at a predetermined rotational speed and the water supplying unit 33 is controlled to stop supplying water and the water supplying process 121 is ended.

After the water supply process (121) is finished, tub washing is automatically performed (122). The washing process is a process of washing the tub and the drum by increasing the rotation speed of the drum and rotating the drum so that the water accommodated in the tub rotates after the water supply process.

During the cleaning process, the driving unit 38 preferably changes the rotational speed of the drum 32 stepwise. Since the part where the water flows inside the tub 31 differs according to the rotation speed of the drum, it is preferable to change the speed of the drum in multiple stages to evenly clean the tub.

The washing process according to an embodiment of the present invention includes a first washing process of rotating the drum at a first rotational speed so that a part of the water contained in the tub comes into contact with the front surface of the tub; and a secondary washing process in which a portion of the tub rotates at a second rotational speed so as to contact the entire rear surface of the tub.

In the primary washing process, the lower limit of the first rotational speed is the minimum rotational speed at which the water accommodated in the tub can reach the entire front surface of the tub, and the upper limit is the maximum rotational speed considering the load of the driving unit and the overflow of bubbles through the air vent 31a. set to speed

In the secondary washing process, the second rotational speed is set to an appropriate rotational speed so that the surface of the water accommodated in the tub 31 forms a parabolic plane so that the water rotates and touches the entire rear surface of the tub 31 .

However, after the water supply 121 is finished, the water level is sensed through the water level sensor provided in the tub. If the water level sensor value exceeds the set value, it is determined that there are too many bubbles in the tub 31, and the ongoing tub washing process (122 ) is stopped, and a general rinsing water supply and rinsing process (123) is performed. This is because if a lot of bubbles are generated in the tub, the water level sensor value does not decrease properly when water is supplied (121). In order to prevent the risk of foam backflow through 31a), the tow-washing process is stopped and the normal rinsing process is performed.

After the above-described tub washing 122 is completed, a general rinsing water supply followed by a rinsing process 123 is performed. At this time, the drum 32 periodically repeats rotation, and the drum rotates at a speed at which the drum inside the drum can tumble. Tumbling is a drum motion in which laundry is lifted up to a predetermined height on the inner circumferential surface of the drum, falls to the lower side of the drum by gravity when the laundry passes a predetermined height, and is lifted up again while being closely adhered to by the drum.

Looking at the case where the amount of foam is determined to be greater than the set value, the rinsing water supply 221 is performed and the rinsing process 222 is performed while passing through the dehydration step 210 and entering the rinsing step 220. The rinsing step 220 proceeds in the same manner as the rinsing water supply and rinsing 123 when the amount of foam is determined to be less than the set value.

The water supply 121 and the tub washing 122 are processes performed at the beginning of the rinse step when the amount of bubbles is less than the set value, and the initial steps 221 and 222 of the rinse step when the amount of bubbles is greater than the set value and the predetermined With a difference of, the drum rotates intermittently and rotates at a relatively low rpm in the process of rinsing water 221 and rinsing 222 when the amount of foam is greater than the set value, but if the amount of foam is less than the set value, water supply In the case of processes 121 and 122, the drum continuously rotates for a long time and rotates at a relatively high rpm.

In conclusion, in order to prevent the leakage of bubbles through the air vent (31a), if the amount of bubbles is small, it is possible to perform water supply and tub washing processes that require stronger mechanical force, but if the amount of bubbles is relatively large, the mechanical force is relatively By carrying out a mild general rinse process, the rinse step can be flexibly progressed according to the amount of foam.

The accompanying drawings are only for easy understanding of the embodiments described in this specification, and the technical idea disclosed in this specification is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and technical scope of the present invention It should be understood to include water or substitutes.

In addition, although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. Of course, various modifications are possible by those skilled in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

10: casing 20: door
31: tub 32: drum
33: water supply 36: pump
38: driving unit

Claims (14)

spin-drying the laundry by rotating the drum after washing the laundry;
determining the amount of foam generated in the drum or/and tub; And
Rinsing the laundry by rotating the drum while supplying water;
When the determined amount of foam is greater than or less than the set value, a rotation pattern of the drum is performed differently in the rinsing step,
When the amount of foam determined at the beginning of the rinsing step is less than the set value, the rotation speed of the drum is higher than the rotation speed of the drum when it is equal to or greater than the set value.
According to claim 1,
In the dehydration step, a control method of a washing machine comprising sequentially providing a rotational speed acceleration section, a constant speed section, and a deceleration section of the drum in the dehydration step, and determining that the amount of foam is equal to or greater than a set value when the deceleration slope in the deceleration section is larger than a set slope. .
According to claim 2,
and determining that the amount of foam is equal to or greater than the set value when the maximum rotational speed of the drum is less than a set speed value.
According to claim 1,
In the dehydration step, a small dehydration step in which the rotation of the drum is accelerated and then decelerated is repeatedly performed. How to control a large washing machine.
According to claim 4,
Control of the washing machine for measuring the slope of the rotation deceleration section of the drum in a predetermined small dehydration step among the plurality of small dehydration steps, and determining that the amount of foam is equal to or greater than a set value when the measured slope is greater than a set slope Way.
According to claim 4,
Among the plurality of small dehydration steps, in the final small dehydration step, the slope of the rotation speed reduction section of the drum is measured, and when the measured slope is greater than the set slope, it is determined that the amount of bubbles is equal to or greater than the set value.
According to claim 4,
The slope of the rotational deceleration section of the drum in the final small dehydration step and the previous small dehydration step among the plurality of small dehydration steps is measured, and if the measured slope is greater than the set slope, the amount of bubbles is considered to be greater than the set value. Control method of washing machine to determine.
According to claim 4,
A control method of a washing machine for determining that the amount of foam is greater than or equal to a set value when the maximum rotational speed of the drum in the final dehydration step is less than a set speed value.
According to claim 4,
A washing machine control method for determining that the amount of foam is greater than or equal to a set value when the slope of the deceleration section in the small dehydration step is greater than the set slope and the maximum rotational speed of the drum in the final small dehydration step is less than the set speed value.
According to claim 1,
At the beginning of the rinsing step, when the determined amount of foam is less than the set value, the drum continuously rotates for a long time compared to when the amount is greater than the set value.
delete According to claim 1,
At the beginning of the rinsing step, when the determined amount of foam is less than the set value, when water is supplied, laundry adheres to the inner circumferential surface of the drum and rotates together with the drum.
According to claim 1,
At the beginning of the rinsing step, when the determined amount of foam is less than the set value, the drum rotates so that the water contained in the tub touches the entire front and rear surfaces of the tub after water supply is finished.
According to claim 13,
After the water supply is finished, when the value of the water level sensor provided in the tub exceeds a set value, it is determined that the amount of foam is equal to or greater than the set value, and the rotation pattern of the drum is changed accordingly.

Images