KR102381726B1 - Method for controlling washing machine - Google Patents

Abstract

The present invention provides a tub containing water, a drum rotatably provided in the tub, at least one circulation nozzle for spraying water into the drum, a washing motor rotating the drum, and discharge from the tub It relates to a control method of a washing machine comprising a pump for pumping water to the at least one circulation nozzle, the control method comprising: (a) supplying water together with a detergent into the tub, and rotating the drum to Washing the loaded laundry; (b) draining water from the tub; (c) supplying undissolved water into the tub; (d) the laundry is placed on the inner circumferential surface of the drum The washing motor is rotated in one direction so that it rotates together with the drum without falling from the bed, and the pump motor constituting the pump is rotated so that water is sprayed through the at least one circulation nozzle while the drum is rotating to wash the laundry rinsing, wherein step (d) comprises accelerating the washing motor to a speed at which the laundry adheres to the inner circumferential surface of the drum by centrifugal force, and accelerating the pump motor in response to the acceleration of the washing motor. includes steps.

Description

How to control washing machine {METHOD FOR CONTROLLING WASHING MACHINE}

The present invention relates to a control method of a washing machine having a circulation pump for circulating wash water.

In general, a washing machine is a device that separates contaminants from clothes, bedding, etc. (hereinafter abbreviated as 'laundry') by using physical actions such as chemical decomposition of water and detergent and friction between water and laundry. it will be called

Korean Patent Laid-Open Publication No. 2011-0040179 discloses a washing machine configured to circulate water discharged from a tub using a circulation pump and spray the circulated water into a drum disposed in the tub through a nozzle. In such a conventional washing machine, since the circulation pump rotates at a constant speed, the injection pressure of the nozzle is also constant.

Recently, new technologies for controlling the rotation of the drum to give variety to the flow of laundry put into the drum have been developed. However, when the water pressure sprayed through the nozzle is constant as in the prior art, there is a limit in which epoch-making performance improvement cannot be expected.

In particular, there is a problem that the rinsing must be repeated several times because sufficient rinsing performance is not good with a circulation pump that operates at a constant speed as in the prior art.

An object of the present invention is to provide a method for controlling a washing machine with improved rinsing performance.

The present invention provides a tub filled with water, a drum rotatably provided in the tub, at least one circulation nozzle for spraying water into the drum, a washing motor rotating the drum, and the tub discharged from the tub. It relates to a control method of a washing machine including a pump for pumping water to the at least one circulation nozzle.

The control method includes (a) supplying water together with detergent into the tub, rotating the drum to wash the laundry put into the drum, (b) draining water from the tub, (c) ) supplying undissolved water into the tub; (d) rotating the washing motor in one direction so that the laundry rotates together with the drum without falling on the inner circumferential surface of the drum, and the drum is rotated and rotating a pump motor constituting the pump so that water is sprayed through the at least one circulation nozzle while rinsing the laundry.

The step (d) includes accelerating the washing motor to a speed at which the laundry adheres to the inner circumferential surface of the drum by centrifugal force, and accelerating the pump motor in response to the acceleration of the washing motor.

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

The control method of the washing machine of the present invention has the effect of uniformly wet the laundry in the drum by increasing the rotation speed of the pump during the filtration motion. That is, when a large amount of fabric is input, in response to the process in which the empty space in the drum expands in the depth direction of the drum, by increasing the water pressure of the water flow sprayed from the nozzle, the sprayed water flow is further introduced into the drum through the empty space. It can reach deep and effectively wet the laundry located deep in the drum.

In addition, in the control method of the washing machine of the present invention, by varying the rotation speed of the pump, both the laundry located at the front end and the laundry located at the rear end of the drum can be effectively wetted by the water sprayed from the nozzle during filtration motion. It works.

In addition, by improving the rinsing performance, there is an effect of reducing the number of rinsing and reducing the time required for rinsing.

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 illustrating a washing machine according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the washing machine shown in FIG. 1 .
3 is a block diagram illustrating a control relationship between main parts of a washing machine according to an embodiment of the present invention.
4 schematically shows the main components of a washing machine according to an embodiment of the present invention.
5 schematically shows the drum viewed from the front, and the spraying range of each nozzle is shown.
6 is a schematic view of the drum viewed from the side, and the spraying range of each nozzle is shown.
7 is a view showing drum driving motions that can be implemented by a washing machine according to an embodiment of the present invention.
8 is a graph comparing washing power and vibration level of drum driving motions.
9 is a diagram referenced for explaining the injection motion in each drum driving motion of the present invention compared to the conventional one.
10 is a flowchart illustrating a method of controlling a washing motor and a pump motor in a drum driving motion.
11 is a graph showing the speed (a) of the washing motor and the speed (b) of the pump motor in rolling motion and tumbling motion.
12 is a graph showing the speed (a) of the washing motor and the speed (b) of the pump motor in swing, scrub, and step motions.
13 is a graph showing the speed (a) of the washing motor and the speed (b) of the pump motor in the filtration motion.
14 shows the arrangement of laundry in the drum while the filtration motion is being performed, (a) is a case in which a small amount of laundry is put into the drum, and (b) is a case in which a large amount of laundry is put in the drum.
15 is a graph comparing the speed of the pump motor in each drum driving motion, when the laundry amount is in the first laundry weight range (I) and when the laundry weight is in the second laundry weight range (II). “R” is the rpm of the circulation pump motor 92 in the rolling motion, “T” is the rpm of the circulation pump motor 92 in the tumbling motion, and “SW” is the rpm variation range of the circulation pump motor 92 in the swing motion. SC" is the rpm variation range of the circulation pump motor 92 in the scrub motion, "ST" is the rpm variation range of the circulation pump motor 92 in the step motion, and "F" is the rpm variation range of the circulation pump motor 92 in the filtration motion ( 92) shows the rpm variation range.
16 is a graph illustrating operations of a washing motor and a water supply valve in each stage of a rinsing cycle of a washing machine according to an embodiment of the present invention.

Advantages and features of the present invention and methods of 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 these 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 perspective view illustrating a washing machine according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the washing machine shown in FIG. 1 . 3 is a block diagram illustrating a control relationship between main parts of a washing machine according to an embodiment of the present invention. 4 schematically shows the main components of a washing machine according to an embodiment of the present invention.

1 to 4 , the casing 10 forms the exterior of the washing machine, and an inlet 12h into which laundry is put is formed on the front side. The casing 10 includes a cabinet 11 having an open front side, a left side, a right side, and a rear side, and a front panel 12 coupled to the opened front side of the cabinet 11 and having an inlet 12h formed therein. can The bottom and top surfaces of the cabinet 11 are open, and the horizontal base 15 supporting the washing machine may be coupled to the bottom surface. In addition, the casing 10 may further include a top plate 13 covering an open upper surface of the cabinet 11 , and a control panel 14 disposed above the front panel 12 .

The control panel 14 includes an input unit (eg, a button, a dial, a touch pad, etc.) for receiving various settings for operation of the washing machine from a user, and a display unit (eg, LCD, LED display, etc.).

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 substantially central portion, rotatably coupled to the front panel 12 , and a window 22 installed in the open central portion of the door frame 21 . .

A tub 31 containing water may be disposed in the casing 10 . The tub 31 has an inlet formed on the front so that laundry can be put in, and the inlet is communicated with the inlet formed in the casing 10 by a gasket 60 .

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

The gasket 60 includes a casing coupling part 61 coupled around the inlet of the casing 10 , a tub coupling part 62 coupled around the inlet of the tub 31 , and a tub coupling from the casing coupling part 61 . It may include an extension 63 extending to the portion 62 .

A flat portion 64 extending flatly (evenly) from the casing coupling portion 61 to the tub coupling portion 62 is formed in the extension portion 63 , and between the flat portion 64 and the tub coupling portion 62 . A foldable portion 65 may be formed on the .

The folding part 65 is folded or unfolded when the tub 31 moves in an eccentric direction. The folded portion 65 may be formed over the entire circumference of the gasket 60 .

The nozzles 83a and 83b may be installed on the flat portion 64 . According to an embodiment, the nozzles 83a and 83b may be formed integrally with the flat portion 64 , but the present invention is not limited thereto, and a nozzle fastener (not shown) is formed on the flat portion 64 , and the gasket 60 is not limited thereto. ) and an inlet pipe (not shown, a pipe through which water pumped by a pump flows in) formed as a separate part may be inserted/fixed to the nozzle fastener. In either case, preferably, the outlet of the nozzle for spraying water toward the drum 40 is located on the inside surrounded by the gasket 60 , and the circulating water guide pipe 18 is located on the outside of the gasket 60 . connected to the inlet pipe.

The front panel 12 has the periphery of the inlet rolled outward, and the casing coupling portion 61 is fitted in the concave portion formed by the outer circumferential surface of the rolled portion. An annular groove in which the wire is wound is formed in the casing coupling part 61, and after the wire is wound along the groove, both ends of the wire are bound, so that the casing coupling part 61 is connected to the front panel 12 around the inlet. is firmly fixed on

A drum 40 in which laundry is accommodated is rotatably provided in the tub 31 . A plurality of through holes 47 communicating with the tub 31 may be formed in the drum 40 . In addition, a lifter 45 for lifting laundry when the drum 40 rotates may be provided on the inner circumferential surface of the drum 40 .

The drum 40 accommodates the laundry, is disposed so that the inlet into which the laundry is put is located at the front, and rotates about a substantially horizontal rotation center line (C). However, "horizontal" herein 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 that it is approximately horizontal.

The tub 31 may be supported by a damper 16 installed on the bottom of the casing 10 . The vibration of the tub 31 induced when the drum 40 rotates is attenuated by the damper 16 .

A 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 valve 94 for controlling the water supply hose may be provided.

A dispenser 35 for supplying additives such as detergent and fabric softener into the tub 31 or the drum 40 may be provided. In the dispenser 35 , additives may be classified and accommodated according to their types. The dispenser 35 may include a detergent accommodating part (not shown) for accommodating the detergent, and a softener accommodating part (not shown) for accommodating the fabric softener.

At least one water supply pipe 34 for selectively guiding the water supplied through the water supply valve 94 to each receiving part of the dispenser 35 may be provided. The at least one water supply pipe 34 may include a first water supply pipe for supplying water to the detergent accommodating part and a second water supply pipe for supplying water to the fabric softener accommodating part. In this case, the water supply valve 94 is It may include a first water supply valve that regulates the first water supply pipe and a second water supply valve that regulates the second water supply pipe.

On the other hand, the gasket 60 may be provided with a direct water nozzle 57 for spraying water into the drum 32 , and a direct water supply pipe 39 for guiding the water supplied through the water supply valve 94 to the direct water nozzle 57 . ) may be provided. The water supply valve 94 may include a third water supply valve that controls 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 . The tub 31 has a drainage port for discharging water, and the drainage bellows 17 is connected to the drainage port. can A circulation pump 36 for pumping the water discharged to the drain bellows 17 to the circulation water guide pipe 18 may be provided.

The circulation pump 36 may include an impeller (not shown) for pumping water, a pump housing (not shown) in which the impeller is accommodated, and a circulation pump motor 92 for rotating the impeller. The pump housing has an inlet port (not shown) through which water flows through the drain bellows 17, and a circulating water discharge port (not shown) for discharging the water pressurized by the impeller to the circulating water guide pipe 18. can be formed. The inlet of the circulating water guide pipe 18 is connected to the circulating water discharge port, and the outlet is connected to the nozzles 83a and 83b to be described later.

When the user inputs settings (eg, washing course, washing, rinsing, spin-drying time, spin-drying speed, etc.) through the input unit provided on the control panel 14 , the control unit 91 controls the washing machine according to the input settings. control to drive. For example, control algorithms such as the water supply valve 94, the washing motor 93, the circulation pump motor 92, and the drain valve 96 are pre-stored in a memory (not shown) for each course selectable through the input unit. In addition, the controller 91 may control the washing machine to be operated according to an algorithm corresponding to the setting input through the input unit.

A drain pump 33 for pumping water discharged from the tub 31 to the drain pipe 19 may be provided. The drain pump 33 pressurizes the water introduced through the drain bellows 17 to the drain pipe 19 . The drain pump 33 may include an impeller (not shown) for pumping water, a pump housing (not shown) in which the impeller is accommodated, and a drain pump motor 98 for rotating the impeller. The drain pump motor 98 may be configured substantially the same as the circulation pump motor 92 . An inlet port (not shown) through which water flows through the drain bellows 17 and a drain outlet port (not shown) for discharging the water pressurized by the impeller to the drain pipe 19 may be formed in the pump housing. .

Under the control of the controller 91 , the circulation pump 38 may be operated (eg, during washing) or the drain pump 33 may be operated (eg, during drainage) according to a preset algorithm.

On the other hand, the circulation pump motor 92 is a variable speed motor whose rotation speed is controlled. According to an embodiment, when the circulation pump is provided separately from the drain pump, the pump motor constituting the circulation pump may be a variable speed motor. The circulation pump motor 92 is a BLCD motor (Brushless Direct Current Motor) is suitable, but is not necessarily limited thereto. A driver for controlling the speed of the circulation pump motor 92 may be further provided, and the driver may be an inverter driver. The inverter driver converts AC power to DC power and inputs it to the motor at a target frequency.

A control unit 91 for controlling the circulation pump motor 92 may be further provided. The controller 91 may include a proportional-integral controller (PI controller), a proportional-integral-derivative controller (PID controller), and the like. The controller receives the output value (eg, output current) of the circulation pump motor 92 as an input, and based on this, the rotation speed (or rotation speed) of the circulation pump motor 92 is set at a preset target rotation speed (or , the target rotation speed) may be controlled to control the output value of the driver.

On the other hand, the control unit 91 may control not only the circulation pump motor 92 but also the drain pump motor 98 , and further control the overall operation of the washing machine. Even if not mentioned, it will be understood that the control is performed by the control unit 91 .

At least one nozzle (83a, 83b) for injecting the circulating water pressurized by the circulation pump (36) into the drum (40) may be provided. In the embodiment, the nozzles 83a and 83b respectively provided on the left and right sides of the gasket 60 are configured to spray water upward from the lower side than the center of the drum 40 , but this is not necessarily limited thereto. That is, the number or position of the nozzles can be variously modified. However, in any case, in the washing machine according to an embodiment of the present invention, as the supplied water pressure increases (that is, the water pressure and discharge of the pump 36 ) As the flow rate, rotational speed or number of rotations increases), it is preferred to include one or more nozzles configured to spray water further upwards.

The outlet of each of the nozzles 83a and 83b may be opened upwardly toward the inside of the drum 40 . Therefore, when water is supplied above a certain water pressure, spraying through each of the nozzles 83a and 83b is made in an upwardly inclined direction to the inside of the drum 40 , and the sprayed water is sprayed to the depth of the drum 40 . This can be achieved.

On the other hand, when the water pressure of the water supplied to the nozzles 83a and 83b is not sufficient, the water sprayed through the outlets of the nozzles 83a and 83b does not sufficiently advance upward and is easily lowered by gravity, so the drum 40 ) does not reach deep inside.

In FIG. 4 , the injection form when water is supplied by the pump 36 with sufficient water pressure is indicated by “a”, and the case where the water pressure is lower than that is indicated by “b”. That is, as the rotation speed of the pump 36 is varied, the shape of the water flow injected through the nozzles 83a and 83b may be varied between a and b.

5 schematically shows the drum viewed from the front, and the spraying range of each nozzle is shown. 6 is a schematic view of the drum viewed from the side, and the spraying range of each nozzle is shown.

Referring to FIG. 5 , when quadrants Q1 , Q2 , Q3 , and Q4 are defined by dividing the drum 40 viewed from the front, the first nozzle 83a is disposed in the third quadrant Q3 , and the second The nozzle 83b is disposed in the fourth quadrant Q4. 5, the lower limit (b) of the water flow injected through each nozzle (83a, 83b) shows when the circulation pump motor 92 rotates at 2600 rpm, and the upper limit (a) is the circulation pump motor 92 at 3000 rpm. It shows a poem that will be rotated to .

Depending on the rotational speed of the circulation pump motor 92 , the first nozzle 83a is configured to spray water into an area extending to the third quadrant Q3 and the second quadrant Q2 . That is, as the speed of the circulation pump motor 92 increases, water is gradually sprayed upward through the first nozzle 83a, and when the circulation pump motor 92 rotates at the highest speed, the first nozzle 83a The water flow sprayed from the drum 40 reaches the second quadrant Q2 on the rear surface 41 of the drum 40 .

Depending on the rotational speed of the circulation pump motor 92 , the second nozzle 83b is configured to spray water into the area extending to the fourth quadrant Q4 and the second quadrant Q1 . That is, as the speed of the circulation pump motor 92 increases, water is gradually sprayed upward through the second nozzle 83b, and when the circulation pump motor 92 rotates at the maximum speed, the second nozzle 83b The water flow sprayed from the drum 40 reaches the first quadrant Q1 on the rear surface 41 of the drum 40 .

6, if the drum 40 viewed from the side is divided into thirds and the first region, the second region, and the third region are defined in order from the front, as the rotational speed of the circulation pump motor 92 gradually increases, It can be seen that the water flow sprayed from the nozzles 83a and 83b reaches a deeper position of the drum 40 . As exemplarily shown in the figure, when the rotational speed of the circulation pump motor 92 is 2200 rpm, the water flow injected from the nozzles 83a and 83b reaches the first area of the inner peripheral surface 42 of the drum 40, In the case of 2500 rpm, it reaches the second region, and in the case of 2800 rpm, it reaches the third region. When the rotation speed of the circulation pump motor 92 is further increased, the water flow reaches the rear surface 41 of the drum 40, and at 3000 rpm, the water flow reaches 1/3 of the height H of the drum 40, 3400 rpm The water flow reaches 2/3 of the height H of the drum 40 . When the rotational speed of the circulation pump motor 92 reaches 3400 rpm, the height at which the water flow reaches the maximum, and on the structure of the nozzles 83a and 83b, the injection height does not rise anymore after that, only the intensity of the water flow is strengthened

7 is a view showing drum driving motions that can be implemented by a washing machine according to an embodiment of the present invention. Hereinafter, the drum driving motions will be described in detail with reference to FIG. 7 .

The drum driving motion means a combination of the rotational direction and the rotational speed of the drum 40, and the laundry positioned inside the drum 40 by the drum driving motion changes the falling direction or the falling time, and as a result, the drum 40 ), the flow of laundry inside is different. The drum driving motion is implemented by controlling the washing motor 93 by the control unit 91 .

Since the laundry is raised by the lifter 45 provided on the inner peripheral surface of the drum 40 when the drum 40 rotates, the impact applied to the laundry can be varied by controlling the rotation speed and direction of the drum 40 do. That is, it is possible to vary the mechanical force such as friction between laundry, friction between laundry and washing water, and the impact of falling of laundry. In other words, the degree of tapping or rubbing the laundry for washing can be varied, and the degree of dispersing or turning over the laundry can be varied.

On the other hand, in order to implement these various drum driving motions, the washing motor 93 is preferably a direct motor. That is, it is preferable that the stator of the motor has the tub 31 fixed to the rear, and the drive shaft 38 rotated together with the rotor of the motor directly drives the drum 40 . This is because, by controlling the rotation direction and torque of the motor, it is possible to immediately control the drum driving motion by maximally preventing a time delay or backlash.

On the other hand, in the form of transmitting the rotational force of the motor to the rotating shaft through a pulley, etc., a drum driving motion of a type that allows a time delay or backlash, for example, a tumbling driving or a spin driving is possible, but various other drum driving motions It is not suitable for implementing Since the driving method of the washing motor 93 and the drum 40 is obvious to those skilled in the art, a detailed description thereof will be omitted.

7A is a view showing a rolling motion. In the rolling motion, the washing motor 93 rotates the drum 40 in one direction (preferably, one or more rotations), and the laundry on the inner circumferential surface of the drum 40 moves in the direction of rotation of the drum 40 by less than about 90 degrees. It is a motion controlled to fall from position towards the lowest point of the drum 40 .

For example, when the washing motor 93 rotates the drum 40 at about 40 RPM, the laundry located at the lowest point of the drum 40 rises to a predetermined height along the rotation direction of the drum 40, and then It flows toward the lowest point of the drum 40 as if it rolls at a position less than about 90 degrees in the rotational direction from the lowest point. Visually, when the drum 40 rotates clockwise, the laundry continuously rolls in the third quadrant of the drum 40 .

In the rolling motion, laundry is washed through friction with washing water, friction between laundry, and friction with the inner peripheral surface of the drum 40 . At this time, the laundry is turned over sufficiently to obtain the effect of gently rubbing the laundry.

Here, the rotational speed (rpm) of the drum 40 is determined in relation to the radius of the drum 40 . As the rotational speed of the drum 40 increases, the centrifugal force acting on the laundry in the drum 40 also increases. The flow of laundry in the drum 40 is changed due to the difference in magnitude between the centrifugal force and gravity. Of course, the rotational force of the drum 40 and the frictional force between the drum 40 and the laundry must also be considered. As such, when considering various forces acting on the laundry, the rotational speed of the drum 40 in the rolling motion is determined in a range in which the sum of the centrifugal force and the frictional force is smaller than the gravity (1G).

7B is a diagram showing a tumbling motion. In the tumbling motion, the washing motor 93 rotates the drum 40 in one direction (preferably, one or more rotations), and the laundry on the inner circumferential surface of the drum 40 moves in the direction of rotation of the drum 40 by about 90 degrees to 110 degrees. It is a motion controlled to fall from position to the lowest point of the drum 40 . The tumbling motion is a drum driving motion generally used for washing and rinsing because mechanical force is generated only by controlling the drum 40 to rotate in one direction at an appropriate rotation speed.

That is, the laundry put into the drum 40 is positioned at the lowest point of the drum 40 before the washing motor 93 is driven. When the washing motor 93 provides torque to the drum 40 , the drum 40 rotates, and the laundry is removed by friction with the lifter 45 provided on the inner circumferential surface of the drum 40 or the inner circumferential surface of the drum 40 . It rises from the lowest point in the drum 40 to a predetermined height. For example, when the washing motor 93 rotates the drum 40 at about 46 rpm, the laundry falls from the lowest point of the drum 40 to the lowest point of the drum 40 at about 90 to 110 degrees in the rotational direction. do.

The rotational speed of the drum 40 in the tumbling motion may be determined in a range in which centrifugal force is generated larger than in the case of rolling motion, but is generated less than gravity.

Visually, the tumbling motion is, when the drum 40 rotates clockwise, the laundry rises from the lowest point of the drum 40 to a 90 degree position or the second quadrant, and then is separated by the inner peripheral surface of the drum 40 and the lowest point of the drum 40 It is in the form of falling towards

Therefore, during the tumbling motion, laundry is washed by friction with washing water and impact force caused by falling, and in particular, it is washed by a greater mechanical force than in the case of the rolling motion. In particular, the tangled laundry is separated during the tumbling motion, and there is an effect that the laundry is dispersed.

7C is a view showing a step motion. In the step motion, the washing motor 93 rotates the drum 40 in one direction (preferably, less than one rotation), but the laundry on the inner peripheral surface of the drum 40 is near the highest point of the drum 40 (preferably). , about 146 to 161 degrees in the rotational direction of the drum 40, but it is not necessarily limited thereto, and an angular position greater than 161 degrees is possible within a range not exceeding 180 degrees.) of the drum 40 Motion controlled to fall towards the lowest point.

That is, the step motion is the speed at which laundry does not fall from the inner circumferential surface of the drum 40 due to centrifugal force (that is, the speed at which laundry is rotated together with the drum 40 while attached to the inner circumferential surface of the drum 40 due to centrifugal force) This is a motion that maximizes the impact force on the laundry by rapidly braking the drum 40 after rotating the furnace drum 40 .

For example, when the washing motor 93 rotates the drum 40 at about 60 rpm or more, the laundry rotates without falling by centrifugal force (that is, the drum 40 in a state attached to the inner circumferential surface of the drum 40) In this process, when the laundry is located near the highest point (180 degrees in the rotational direction) of the drum 40, the torque in the opposite direction to the rotational direction of the drum 40 is applied to the washing motor ( 93) can be controlled.

After the laundry rises from the lowest point of the drum 40 in the direction of rotation of the drum, the drum 40 stops and falls to the lowest point of the drum 40, so that the laundry has a maximum fall, and thus the impact force acting on the laundry is also maximized. A mechanical force (eg, impact force) generated by such a step motion is greater than the aforementioned rolling motion or tumbling motion.

Visually, the step motion is, when the drum 40 rotates clockwise, the laundry located at the lowest point of the drum 40 moves to the highest point (180 degrees) of the drum 40 through the third and second quadrants and then suddenly the drum (40) It is separated from the inner circumferential surface and falls toward the lowest point of the drum (40). Accordingly, the step motion provides the greatest mechanical force as the laundry has the largest drop and the smaller the laundry amount is.

On the other hand, as a control method of the washing motor 93 for braking the drum 40, reverse-phase braking is preferable. Reverse phase braking is a method of braking by generating a rotational force in a direction opposite to the direction in which the washing motor 93 is rotating. The phase of the power supplied to the washing motor 93 may be reversed in order to induce a rotational force opposite to the direction in which the washing motor 93 is rotating, and in this way, sudden braking is possible. Therefore, reverse-phase braking is suitable for step motion.

After the washing motor 93 is braked, the washing motor 93 applies torque to the drum 40 again to raise the laundry at the lowest point of the drum 40 to the highest point. That is, after applying torque to rotate in the forward direction, a torque is applied to instantaneously rotate in the reverse direction to make a sudden stop, and then, torque is applied to rotate in the forward direction again to implement step motion.

In the step motion, when the drum 40 rotates, the laundry is washed by rubbing the washing water and laundry flowing in through the through hole 47 formed in the drum 40. It can be said that the motion of washing by

7 (d) is a view showing a swing motion. In the swing motion, the washing motor 93 rotates the drum 40 in both directions, but at a position less than about 90 degrees in the rotational direction of the drum 40 (preferably, about 30 to about 30 in the rotational direction of the drum 40 ) It is a motion controlled so that the laundry falls at the 45 degree position, but it is not necessarily limited thereto, and an angular position greater than 45 degrees is possible within a range not exceeding 90 degrees). For example, when the washing motor 93 rotates the drum 40 at about 40 rpm in the counterclockwise direction, the laundry positioned at the lowest point of the drum 40 rises to a predetermined height in the counterclockwise direction. At this time, the washing motor 93 stops the rotation of the drum 40 before the laundry reaches the position of about 90 degrees in the counterclockwise direction. moves toward the lowest point of

After the drum 40 stops rotating in this way, the washing motor 93 rotates the drum 40 clockwise at about 40 RPM this time so that the laundry moves in the rotating direction of the drum 40 (ie, clockwise). to rise to a predetermined height accordingly. And, before the laundry reaches the position of about 90 degrees in the clockwise direction, the washing motor 93 is controlled to stop the rotation of the drum 40, so that the laundry moves in the clockwise direction of the drum 40 at a position of less than about 90 degrees. falls towards the lowest point of

That is, the swing motion is a motion in which the forward rotation/stop of the drum 40 and the reverse rotation/stop of the drum 40 are repeated. After ascending to the quadrant, it gently falls, passes through the fourth quadrant of the drum 40 again, rises to the first quadrant, and then gently falls. That is, visually, the swing motion becomes a form in which laundry flows in a figure 8 shape lying on its side across the third and fourth quadrants of the drum 40 .

In this case, power generation braking is suitable for braking of the washing motor 93 . The power generation braking minimizes the load generated on the washing motor 93 , and minimizes mechanical wear of the washing motor 93 , and at the same time makes it possible to control the impact applied to the laundry.

Power generation braking is a braking method using that the washing motor 93 acts as a generator due to rotational inertia when the current applied to the washing motor 93 is turned off. When the current applied to the washing motor 93 is turned off, the direction of the current flowing through the coil of the washing motor 93 is opposite to the direction of the current before the power is turned off. Fleming's right hand rule) acts to brake the washing motor 93 . Unlike reverse-phase braking, power generation braking does not rapidly brake the washing motor 93 and allows the rotation direction of the drum 40 to be smoothly switched.

7 (e) is a view showing a scrub motion (scrub motion). The scrub motion is a motion in which the washing motor 93 alternately rotates the drum 40 in both directions, and the laundry is controlled so that the laundry falls at a position of about 90 degrees or more in the rotational direction of the drum 40 .

For example, when the washing motor 93 rotates the drum 40 at about 60 rpm or more in the forward direction, the laundry positioned at the lowest point of the drum 40 rises to a predetermined height in the forward direction. At this time, the washing motor 93 is a position corresponding to the setting angle of the laundry in the forward direction of about 90 degrees or more (preferably, 139 to 150 degrees, but not necessarily limited thereto, and 150 degrees or more is possible.) A reverse torque is provided to the drum 40 to temporarily stop the rotation of the drum 40 . Then, the laundry on the inner circumferential surface of the drum 40 falls rapidly.

Thereafter, the washing motor 93 rotates the drum 40 at about 60 rpm or more in the reverse direction to raise the dropped laundry to a predetermined height of 90 degrees or more in the reverse direction. When the laundry reaches a set angle of 90 degrees or more in the reverse direction (for example, a position corresponding to 139 to 150 degrees), the washing motor 93 provides a reverse torque to the drum 40 again to temporarily stop the rotation of the drum 40 At this time, the laundry on the inner peripheral surface of the drum 40 falls toward the lowest point of the drum 40 at a position of 90 degrees or more in the reverse direction.

The scrub motion washes the laundry by causing the laundry to fall rapidly from a predetermined height. In this case, it is preferable that the washing motor 93 is reverse-phased to brake the drum 40 .

Since the rotation direction of the drum 40 is rapidly changed, the laundry does not deviate significantly from the inner circumferential surface of the drum 40 , so that a very powerful rubbing effect can be obtained.

In scrub motion, the laundry that has moved forward through the third quadrant to the second quadrant falls rapidly, and in the reverse direction, it passes through the fourth quadrant and moves to a part of the first quadrant, and then falls repeatedly. Therefore, visually, it can be said that the laundry rises and then descends along the inner circumferential surface of the drum 40 repeatedly.

7(f) is a view showing a filtration motion. In the filtration motion, the washing motor 93 rotates the drum 40 so that the laundry does not fall off the inner circumferential surface of the drum 40 by centrifugal force, and in this process, the washing water flows into the drum 40 through the nozzles 83a and 83b. It is a motion that sprays

After the laundry is unfolded, since the wash water is sprayed into the drum 40 while it is rotated in close contact with the inner circumferential surface of the drum 40, the sprayed wash water passes through the laundry by centrifugal force, ) to exit through the tub (31).

Due to the filtration motion, the surface area of the laundry is widened, and since the washing water permeates the laundry, there is an effect that the laundry is evenly wetted.

7 (g) is a view showing a squeeze motion (squeeze motion). In the squeeze motion, the washing motor 93 rotates the drum 40 so that the laundry does not fall off the inner circumferential surface of the drum 40 by centrifugal force, and then lowers the rotation speed of the drum 40 to remove the laundry from the inner circumferential surface of the drum 40 This is a motion of repeating the separation operation and spraying wash water into the drum 40 through the nozzles 83a and 83b while the drum 40 is rotating.

In the filtration motion, the laundry continues to rotate at a speed that does not fall off the inner peripheral surface of the drum 40, but the squeeze motion changes the rotation speed of the drum 40 so that the laundry adheres to and separates from the inner peripheral surface of the drum 40 repeatedly. There is a difference in

8 is a graph comparing washing power and vibration level of drum driving motions. In FIG. 8 , the horizontal axis represents the washing power, and as it goes to the left, it is easier to separate the dirt contained in the laundry. The vertical axis indicates the level of vibration or noise, and as it goes upward, the level of vibration increases, but the washing time for the same laundry decreases.

The step motion and scrub motion have excellent washing power, so they are suitable for the case of heavy contamination of the laundry and the washing course to shorten the washing time. In addition, step motion and scrub motion are motions with high levels of vibration and noise. Therefore, it is an undesirable motion when the laundry is sensitive clothing or in a laundry course in which noise and vibration need to be minimized.

Rolling motion is characterized by excellent cleaning power, low vibration level, minimal damage to laundry and low motor load. Therefore, it is applicable to all washing courses, but in particular, it is a motion suitable for dissolving detergent and wetting laundry at the initial stage of washing. However, the rolling motion has a disadvantage in that it takes longer to wash the washing to the same level as compared to the tumbling motion, although the vibration level is low.

In the tumbling motion, the cleaning power is lower than that of the scrub motion, but the vibration level is intermediate between the scrub motion and the rolling motion. The tumbling motion is applicable to all washing courses, but it is particularly useful in the step for dispersing the fabric.

In the squeeze motion, the washing force is similar to that of the tumbling motion, and the vibration level is higher than that of the tumbling motion. The squeeze motion is useful for rinsing because washing water passes through the laundry and is discharged to the outside of the drum 40 in the process of repeating adhesion and separation of the laundry to the inner peripheral surface of the drum 40 .

In the filtration motion, the cleaning power is lower than that of the squeeze motion, and the noise level is similar to the rolling motion. The filtration motion is a useful motion to wet the laundry or to apply detergent water to the laundry at the beginning of washing because the washing water passes through the laundry and is discharged to the tub 31 while the laundry is in close contact with the inner circumferential surface of the drum 40 .

Swing motion is the motion with the lowest vibration level and cleaning power. Therefore, the swing motion is a motion useful for a low-noise or low-vibration washing course, and is a motion suitable for sensitive laundry (gentle care).

9 is a diagram referenced for explaining the injection motion in each drum driving motion of the present invention compared to the conventional one. 9 (a) is a graph showing the rotational speed of the drum 40 or washing motor 93 for each drum driving motion, (b) is a conventional washing machine equipped with a constant speed pump, in each drum driving motion It is a graph showing the rotation speed of the pump motor, (c) is a graph showing the rotation speed of the circulation pump motor 92 in each drum driving motion in the washing machine according to an embodiment of the present invention, (d) shows the movement of laundry in each drum driving motion, and (e) is a form of spraying (hereinafter, " It is referred to as "injection motion.") is shown.

Referring to FIG. 9 , since the conventional washing machine cannot change the speed of the pump motor, even if the drum driving motion is changed, the pump motor has no choice but to rotate at a constant speed. Therefore, in the conventional washing machine, the water flow sprayed through the nozzle could not effectively respond to the movement of the cloth induced by the type of drum driving motion, and it was difficult to manage power consumption, washing performance, wetness performance, and the like. The present invention aims to solve the above problems by appropriately controlling the rotational speed of the circulation pump motor 92 according to the drum driving motion, and further, by considering the amount of laundry in this process.

In particular, the cloth rises in a state of being attached to the inner peripheral surface 42 of the drum 40 by the rotating drum 40, and when it reaches a predetermined height, it is separated from the inner peripheral surface 42 by the braking of the drum 40 and falls In the case of drum driving motions (hereinafter, referred to as "fall-inducing motion by braking". For example, swing motion, step motion, or scrub motion), the rotational speed of the circulation pump motor 92 is variable within a predetermined range. However, the range is set according to the amount of laundry.

And, in the case of the rolling motion, the tumbling motion, and the filtration motion, in a section in which the rotational speed of the circulation pump motor 92 is kept constant, the rotational speed is set according to the amount of laundry.

Meanwhile, referring to FIG. 9C , in the case of a rolling motion, a swing motion, a step motion, a scrub motion, and a filtration motion, the rpm of the pump motor 92 may be controlled in a different way. In the figure, the rpm of the pump motor 92 when the amount of laundry is large is shown by a solid line, and the rpm of the pump motor 92 when the amount of laundry is small is shown by a dotted line. In the case of the tumbling motion, the rpm of the pump motor 92 may be controlled in the same way regardless of the amount of laundry.

In each of the drum driving motions shown in FIG. 9, the operations of the washing motor 93 and the circulation pump motor 92 are interlocked with each other. Hereinafter, a method in which the washing motor 93 and the circulation pump motor 92 are controlled will be described with reference to FIG. 9 . In FIG. 9 , A1 to A6 indicate control steps of the washing motor 93 , and B1 to B6 indicate control steps of the circulation pump motor 92 .

When a preset drum driving motion is performed while the washing machine operates, the controller 91 controls the washing motor 93 and the circulation pump motor 92 according to a method determined for each drum driving motion.

Specifically, the controller 91 starts driving the washing motor 93 (A1) and accelerates the washing motor 93 (A2). A sensor for detecting the rotation angle of the drum 40 may be provided, and the rotation angle of the drum 40 sensed through the sensor is a value determined for each drum driving motion (θ, hereinafter referred to as “motion angle”). When reaching (A3), the controller 91 may control the washing motor 93 to be decelerated (A4).

In the case of the rolling motion, the tumbling motion, and the filtration motion, since the rotation of the drum 40 is continuous by one or more rotations, the motion angle θ has a value of 360 degrees or more.

On the other hand, in the case of a fall-inducing motion caused by braking such as swing motion, step motion, scrub motion, etc., the motion angle θ is within 180 degrees so that the fore can be induced. set to a value. For example, the motion angle θ is a value between 30 and 45 degrees in the case of a swing motion, a value between 146 and 161 degrees in the case of a step motion, and a value between 139 and 150 degrees in the case of a scrub motion. .

As the drum 40 is decelerated and stopped, the drum driving motion is completed once, and the drum driving motion is performed again (A5). The controller 91 repeats steps A2 to A5 until the drum driving motion reaches a preset number of times, and when the preset number of times is reached, stops the operation of the washing motor 93 (A6).

On the other hand, when the driving of the washing motor 93 is started in step A1, the control unit 91 applies the start signal SG1 to the circulation pump motor 92, and in response to the start signal SG1, the circulation pump motor ( 92) is started (B1). Thereafter, the control unit 91 accelerates the circulation pump motor 92 according to a setting determined for each drum driving motion based on the motion information (that is, information on the currently implemented drum driving motion) (B2).

Meanwhile, in step A3 , when the rotation angle of the drum 40 reaches the motion angle θ, the controller 91 applies the angle control completion signal SG2 to the circulation pump motor 92 .

In the case of a fall-induced motion by braking, in B2, the circulation pump motor 92 responds to the angle control completion signal SG2, and the rotation speed reaches the upper limit value Pr(V, H) determined for each drum driving motion. After that, acceleration is stopped (or braking of the circulation pump motor 92 ), and the speed is decelerated according to a setting determined for each drum driving motion (B4, B5).

Then, in step A5, when the washing motor 93 is started again, the control unit 91 applies the restart signal SG3 to the circulation pump motor 92, and the circulation pump motor 92 receives the restart signal. In response to (SG3), when the rotational speed reaches the lower limit (Pr(V, L)) determined for each drum driving motion, deceleration is stopped (B5), and steps B2 to B5 are repeated.

On the other hand, in the case of swing motion, tumbling motion or filtration motion, when the angle control completion signal SG2 is applied to the circulation pump motor 92, the circulation pump motor 92 maintains the rotation speed determined for each drum driving motion, is being rotated Accordingly, in the case of these motions, in response to the angle control completion signal SG2, deceleration of the circulation pump motor 92 is performed (B4).

Meanwhile, in any drum driving motion, when the washing motor 93 is stopped in step A6, the control unit 91 applies a stop signal SG4 to the circulation pump motor 92, and Accordingly, the circulation pump motor 92 is stopped.

Hereinafter, a control method for the washing motor 93 and the circulation pump motor 92 for each drum driving motion will be described in more detail.

11 is a graph showing the speed (a) of the washing motor and the speed (b) of the pump motor in rolling motion and tumbling motion. 15 is a graph comparing the speed of the pump motor in each drum driving motion when the laundry amount falls within the first laundry weight range (I) and when the laundry weight falls within the second laundry weight range (II).

11 and 15 , the rolling motion and the tumbling motion are performed in a state in which water is contained in the tub 31 so that the water flow can be sprayed through the nozzles 83a and 83b. Referring to FIG. 11 , in the rolling motion, the controller 91 controls the washing motor 93 to move the laundry on the inner circumferential surface of the drum 40 to a position corresponding to the rotation angle of the drum 40 less than approximately 90 degrees. The drum 40 is rotated in one direction to fall from the raised position. In the rolling motion, the washing motor 93 or the drum 40 may be rotated while maintaining Dr(R) for a predetermined time after being accelerated to the rotational speed Dr(R). The rotational speed Dr(R) is preferably 37 to 40 rpm, but is not necessarily limited thereto.

While the rolling motion is being performed, the rotational speed of the circulation pump motor 92 is controlled to a preset rotational speed Pr(R). 11 , t(SG1) is the generation time of the start signal SG1, t(SG2) is the generation time of the angle control completion signal SG2, and t(SG3) is the generation time of the restart signal SG3 . Hereinafter, similarly displayed in other embodiments (in FIG. 12, t(SG4) is the generation time of the stop signal SG4).

The rotation speed Pr(R) may be set according to the amount of laundry. Before the drum driving motion is implemented, the control unit 91 may rotate the washing motor 93 and detect the amount of laundry in this process. The amount of laundry may be determined based on the principle that the rotational inertia of the drum 40 varies according to the amount of cloth put into the drum 40 . For example, the laundry amount may be determined based on a preset It is obtained based on the time it takes to reach the target speed, is obtained based on the acceleration slope of the washing motor 93 , or is obtained based on the time taken from braking the washing motor 93 to stop, or the deceleration slope It can be obtained based on , or it can be obtained based on the back electromotive force at the time of power generation braking. It is not limited thereto, and various methods for calculating the amount of laundry are already known in the washing machine technology field, and of course, these known techniques may be applied. Hereinafter, although not described, it is assumed that the step of detecting the amount of laundry is performed before each drum driving motion is executed.

The control unit 91 may set the rotation speed Pr(R) according to the laundry amount range to which the detected laundry weight belongs. For example, the laundry amount may be subdivided into a first level to a ninth level, wherein the laundry weight range is divided into a small amount (or the first laundry weight range (I), see Fig. 15) and a large amount (or a second laundry weight range ( II), see Fig. 15.), it can be classified as a small amount when the detected laundry amount is from the first level to the fourth level, and can be classified as a large amount when the detected laundry amount is from the fifth level to the ninth level. However, the present invention is not limited thereto, and it is also possible to classify the laundry weight range for each level.

In the embodiment, the rotation speed Pr(R) is set higher in the case of a large amount of laundry than in the case of a small amount. For example, when the amount of laundry is small, the rotation speed Pr(R) may be set to 2800 rpm, and when the amount of laundry is large, it may be set to 3100 rpm. In particular, when the amount of cloth is small, since most of the cloth moves in the front portion of the drum 40 , the water flow sprayed from the nozzles 83a and 83b does not have to touch the rear surface 41 of the drum 40 . (2800rpm or less. See Fig. 6.)

Conversely, when the amount of cloth is large, since the cloth fills up to the center of the drum 40, the water flow sprayed from the nozzles 83a and 83b must be able to reach a height higher than the center of the drum 40, so that the water flow is It is preferable to reach the first quadrant Q1 and the second quadrant Q2, and for this purpose, the rotational speed of the circulation pump motor 92 is set to about 3000 rpm or more, preferably 3100 rpm.

In the case of the tumbling motion, the washing motor 93 and the circulation pump motor 92 are controlled in a manner similar to the rolling motion. However, the rotation speed Dr(R) of the washing motor 93 is higher than that in the rolling motion, and the rotation speed Pr(T) of the circulation pump motor 92 is also higher than in the case of the rolling motion for the same amount of laundry. On the other hand, the rotation speed Dr(T) of the washing motor 93 is preferably 46 rpm, but is not necessarily limited thereto.

On the other hand, in the case of the tumbling motion, it is important to apply a stronger mechanical force to the cloth than in the case of the rolling motion, so the water flow pressure sprayed through the nozzles 83a and 83b needs to be sufficient regardless of the amount of cloth. Accordingly, in the case of the tumbling motion, the circulation pump motor 92 may be rotated at a constant speed having a value between 3400 and 3600 rpm regardless of the amount of laundry. However, the present invention is not limited thereto, and it is of course possible to set the rotation speed Pr(T) higher than when the amount of laundry is large compared to when the amount of laundry is small. For example, when the amount of laundry is small, the rotation speed Pr(T) may be set to 3400 rpm, and when the amount of laundry is large, it may be set to 3600 rpm.

12 is a graph showing the speed (a) of the washing motor and the speed (b) of the pump motor in swing, scrub, and step motions. 12 and 15 , in the case of a fall-inducing motion by braking, the control unit 91 controls the rotation speed of the circulation pump motor 92 to vary while the drum 40 is rotating.

The fall-inducing motion by braking is performed in a state in which water is contained in the tub 31 so that the water flow can be sprayed through the nozzles 83a and 83b. In the fall-inducing motion due to braking, the controller 91 controls the washing motor 93 so that the laundry on the inner circumferential surface 42 of the drum 40 rises without falling from the inner circumferential surface 42 by centrifugal force. After the furnace drum 40 is rotated, the drum 40 is braked so that laundry falls from the inner circumferential surface 42 . That is, during the fall-inducing motion by braking, the washing motor 93 rises to a preset rotation speed Dr(V), and then decelerates until it stops.

The rotation speed Dr(V) may be set differently for each drum driving motion. Since the rotational speed Dr(V), that is, the maximum rising height of the forearm increases in the order of swing motion, scrub motion, and step motion, a larger centrifugal force must act in the order of the motions, and therefore, the rotational speed Dr (V)) may also be set to a larger value in the order of the motions.

However, the maximum rise height of the forearm in the fall-inducing motion caused by braking is also determined by the rotation angle (or motion angle θ) at which the drum 40 is braked, and the rotation speed Dr(V)) Even if the swing motion, scrub motion, and step motion are all set the same, if the motion angle (θ) in each motion is set differently, the maximum height of the forearm (or the height at which the fore begins to fall) may also vary. there is. In any case, it is preferable that the motion angle θ is set high in the order of swing motion, scrub motion, and step motion. Within the range that satisfies this premise, for example, the motion angle θ is 30 to 45 degrees in the case of a swing motion, 139 degrees to 150 degrees in the case of a scrub motion, and 146 degrees to 161 degrees in the case of a step motion. It can be set to a value.

On the other hand, while the fall-inducing motion by braking is being implemented, the control unit 91 increases the rotation speed of the circulation pump motor 92 while the laundry is rising (or while the washing motor 93 is being accelerated), , while the laundry is falling (or when the washing motor 93 is braked and decelerated), the rotation speed of the circulation pump motor 92 is reduced. At this time, the circulation pump motor 92 may be varied within the rotational speed range set for each drum driving motion. 12 shows the upper limit of the rotation speed range as the highest rotation speed Pr(V, H), and the lower limit value as the lowest rotation speed Pr(V, L).

The rotation speed range is set according to the amount of laundry. That is, the control unit 91 sets the maximum rotation speed Pr(V, H) and the minimum rotation speed Pr(V, L) according to the amount of laundry. In each drum driving motion, the rotational speed range may be set to a higher band as the amount of laundry increases.

For example, in the case of scrub motion, when the detected laundry amount is in a small amount (or the first laundry amount range (I), see FIG. 15), the rotation speed of the circulation pump motor 92 is the lowest rotation speed Pr( It can be varied between 2800 rpm, which is V, L)), and 3100 rpm, which is the maximum rotation speed (Pr(V, H)). And, when the detected laundry amount is a large amount (or the second laundry weight range (II), see FIG. 15), the rotation speed of the circulation pump motor 92 is 3400 rpm, which is the minimum rotation speed Pr(V, L)). The maximum rotation speed (Pr(V, H)) can be varied between 3600rpm.

In the case of step motion, when the detected laundry amount is in a small amount (or the first laundry amount range (I), see Fig. 15.), the rotation speed of the circulation pump motor 92 is the lowest rotation speed Pr(V, L) ) can be varied between 2200 rpm and 2500 rpm, which is the maximum rotation speed (Pr(V, H)). And, when the detected laundry amount is a large amount (or the second laundry weight range (II), see FIG. 15), the rotation speed of the circulation pump motor 92 is 3400 rpm, which is the minimum rotation speed Pr(V, L)). The maximum rotation speed (Pr(V, H)) can be varied between 3600rpm.

Meanwhile, even in the case of the swing motion, a range in which the rotational speed of the circulation pump motor 92 is variable may be set according to the amount of laundry in the same manner as in the scrub motion or step motion.

However, in the case of the swing motion, since the drop of the cloth is not large compared to the scrub motion or the step motion, the rotational speed range of the circulation pump motor 92 can be set constant regardless of the amount of cloth, for example, In both cases where the cloth is small or large, the circulation pump motor 92 can be varied between 2200 rpm, which is the lowest rotational speed Pr(V, L), and 2800 rpm, which is the highest rotation speed Pr(V, H). can

13 is a graph showing the speed (a) of the washing motor and the speed (b) of the pump motor in the filtration motion. 14 shows the arrangement of laundry in the drum while the filtration motion is being performed, (a) is a case in which a small amount of laundry is put into the drum, and (b) is a case in which a large amount of laundry is put in.

13 to 15 , while the filtration motion is being performed, the control unit 91 controls the rotation speed of the circulation pump motor 92 while the drum 40 is rotated in one direction (preferably one or more rotations). (Pr(F)) is controlled so that it rises. In the process of performing the filtration motion, when the rotational speed of the drum 40 starts to increase, the centrifugal force acting on the laundry also increases, and the inner circumferential surface of the drum 40 sequentially from the laundry located close to the inner circumferential surface of the drum 40 . adhered to or adhered to. That is, during the filtration motion, the rotational speed of the drum 40 starts to increase and in the process of reaching the preset rotational speed Dr(F), in the beginning, sufficient centrifugal force is applied to the laundry located in the center of the drum 40. If the rotation speed of the drum 40 is sufficiently increased, the position of most of the laundry (preferably, all laundry) in the drum 40 with respect to the drum 40 is changed. is fixed

In particular, when the amount of laundry put into the drum 40 is below a certain level, the laundry generally gathers at the entrance of the drum 40 during the filtration motion (refer to (a) of FIG. 14 ). In this case, it is preferable to control the rotation speed of the circulation pump motor 92 to be low so that the circulating water sprayed from the nozzles 83a and 83b falls in front of the drum 40 .

Conversely, when the amount of laundry put into the drum 40 is above a certain level, in the process of increasing the rotational speed of the drum 40, the empty space surrounded by the laundry expands backward from the entrance of the drum 40. , is eventually formed as shown in Fig. 14 (b). Controlling the rotational speed of the circulation pump motor 92 to increase while the filtration motion is performed is based on the mechanism of expansion of the empty space in the drum 40 as described above found in the process of performing the filtration motion. did it That is, in the process in which the empty space is expanded to the rear of the drum 40, the injection pressure of the nozzles 83a and 83b is also increased in conjunction, so that the water flow can reach the deep inside of the drum 40. will be.

In the filtration motion, the control unit 91 accelerates the washing motor 93 until it reaches a preset rotation speed Dr(F), and when the rotation speed Dr(F) is reached, the rotation speed ( Control so that Dr(F)) is maintained. The rotation speed Dr(F) is determined within a range in which it is rotated in a powdered state depending on the inner circumferential surface of the cloth drum 40, and its value may vary depending on the amount of laundry, but is set between approximately 80 and 108 rpm.

In the filtration motion, the maximum rotational speed of the circulation pump motor 92 is set according to the amount of laundry. That is, the controller 91 may set the maximum rotational speed Pr(F) according to the sensed laundry amount. Compared to the case where the detected laundry weight belongs to a small amount (or the first laundry weight range (I), see Fig. 15), when the detected laundry weight belongs to a large amount (or the second laundry weight range (II), see Fig. 15.), the highest rotation The speed Pr(F) may be set to a larger value.

16 is a graph illustrating operations of a washing motor and a water supply valve in each stage of a rinsing cycle of a washing machine according to an embodiment of the present invention. A method of controlling a washing machine according to an embodiment of the present invention will be described with reference to FIG. 16 .

The user inputs various settings through an input unit provided on the control panel 14 , and the washing machine starts to operate. According to the input setting, the washing cycle, the rinsing cycle, and the dehydration cycle may be sequentially performed or may be selectively performed. The progress of these processes may be displayed through a display unit provided on the control panel 14 .

In the washing cycle, water is supplied with detergent into the tub 31 . Water supplied through the water supply valve 94 is supplied into the tub 31 via the detergent box. Accordingly, the detergent contained in the detergent box is supplied with water. The washing cycle may include driving the circulation pump motor 92 to spray detergent water through the nozzles 83a and 83b.

In the rinsing cycle, the detergent is removed from the cloth after the washing cycle, and raw water (water without detergent) supplied to the water supply valve 94 is directly supplied into the tub 31 . Due to the water supply during the washing cycle, since the detergent contained in the detergent box has already been discharged along with the water, even if the water supplied through the water supply valve 94 passes through the detergent box during water supply during the rinsing cycle, more No more detergent is supplied. However, if the detergent box has a space in which the detergent is contained and the space in which the fabric softener is contained, and is configured such that water is supplied through the space containing the fabric softener during the rinsing operation, the fiber together with the water during the rinsing operation A softening agent may be supplied.

In the dewatering cycle, after the rinsing cycle is completed, the drum 40 is rotated at high speed to remove water from the cloth, and the water thus removed is drained using the drain pump 33 . In general, the operation of the washing machine is terminated when the spin-drying cycle is completed, but in the case of a washing machine having a drying function, a drying cycle may be further performed after the spin-drying cycle.

The method for controlling a washing machine according to an embodiment of the present invention may be performed during a rinsing cycle. The rinsing operation includes a water supply step of supplying water into the tub 31 by opening the water supply valve 94, and a drum driving motion is performed in a state in which a predetermined amount of water is filled in the tub 31 by the water supply step. and may include a step in which the operation of the circulation pump motor 92 is controlled in this process.

In particular, the filtration motion may be performed during the rinsing cycle, and as described above in this process, the control unit 91 increases the rotation speed of the circulation pump motor 92 to the preset rotation speed Pr(F). , the rotation speed Pr(F) can be controlled to be maintained. As described above, the control of the circulation pump motor 92 (hereinafter, referred to as “filtration injection”) performed while the filtration motion is performed is as described above with reference to FIGS. 13 to 15 .

The filtration spraying may be performed at least once during the rinsing cycle, and after the filtration spraying is performed once, the water in the tub 31 is drained by the drain pump 33, and thereafter, water supply and filtration spray again is carried out Preferably, after the last water supply in the rinsing stroke, the filtration spray is performed at least once.

As described above with reference to FIG. 14 , during filtration injection, in response to an increase in the rotation speed of the circulation pump motor 92 , the injection direction of the water flow through the nozzles 83a and 83b is gradually increased, and thus , the water flow sprayed from the nozzles 83a and 83b is gradually moved from the front part of the drum 40 to the deep inside of the drum 40 . In particular, since the cloth is attached to the inner circumferential surface 42 of the drum 40 by the filtration motion, by the water flow sprayed from the nozzles 83a and 83b, Detergents are sequentially removed in the order of the cloths located in the rear part. In particular, since the area in which the water flow sprayed from the nozzles 83a and 83b affects the drum 40 transitions from the front to the rear, the bubbles removed from the cloth are also moved and collected from the front to the rear by the water flow in a certain direction, As the rotation of the drum 40 and the spraying of the water flow continue, it is diluted and discharged through the through hole formed in the drum 40, so that re-contamination of the fabric by the bubbles is reduced.

On the other hand, while the filtration injection is performed, drainage may be performed by the drainage pump 33 , and furthermore, it is also possible that water supply for replenishing the drained water is additionally performed through the control of the water supply valve 94 . .

Hereinafter, an example of a process in which water is sprayed through the nozzles 83a and 83b while the drum driving motion is performed will be described in detail with reference to FIG. 16 .

During the rinsing cycle, the first rinsing step (S1) and the second rinsing step (S2) may be performed. In the first rinsing step (S1), a tumbling motion is performed, and in this process, the circulation pump motor 92 is operated to spray through the nozzles 83a and 83b. The control of the washing motor 93 for the tumbling motion and the control of the circulation pump motor 92 in this process are as described above with reference to FIGS. 10 to 11 .

While the first rinsing step S1 is being performed, the control unit 91 may open the water supply valve 94 so that water is supplied into the tub 31 . In the first rinsing step (S1), the drain valve 96 is in a closed state, and while the tumbling motion is being performed, the circulation pump motor 92 is operated to spray through the nozzles 83a and 83b.

The second rinsing step S2 is performed after the first rinsing step S1, and when the second rinsing step S2 is started, the tub 31 is filled with water supplied in the first rinsing step S1. . In the second rinsing step (S2), the filtration motion is performed. When the first rinsing step (S1) is finished, the controller 91 does not stop the rotation of the washing motor 93, but increases the rotational speed of the washing motor 93. It can be controlled so as to directly accelerate from the rotational speed Dr(T) at which the tumbling motion is performed to reach the rotational speed Dr(T) at which the filtration motion is performed. While the second rinsing step S2 is being performed, the controller 91 may control the drain valve 96 to open so that the water in the tub 31 is drained, and at this time, the drain pump 33 is operated. can be

While the second rinsing step S2 is performed, the water supply valve 94 may be opened, and water may be further sprayed through the direct water nozzle 57 .

The control unit 91 does not stop the rotation of the washing motor 93 at the end of the second rinsing step S2, and when the rotation speed of the washing motor 93 reaches the rotation speed Dr(T), the circulation pump motor 92 can be controlled to maintain the rotational speed Dr(T), and from this point on, the first rinsing step S1 is performed again. When the first rinsing step S2 is re-executed, the drainage is stopped and the water supply valve 94 is opened again.

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and in the technical field to which the present invention belongs, without departing from the gist of the present invention as claimed in the claims Various modifications may be made by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

Claims (10)

A tub containing water, a drum rotatably provided in the tub, a circulation nozzle for spraying water into the drum, a washing motor rotating the drum, and water discharged from the tub to the circulation nozzle In the control method of a washing machine comprising a pump for pumping,
(a) supplying water together with detergent into the tub and rotating the drum to wash the laundry put into the drum;
(b) draining water from the tub; and
(c) supplying water into the tub; and
(d) rotating the washing motor so that the laundry rotates together with the drum without falling on the inner circumferential surface of the drum, and configuring the pump to spray water through the circulation nozzle while the drum is rotating; comprising the step of driving
Step (d) is,
accelerating the washing motor to a speed at which the laundry adheres to the inner circumferential surface of the drum by centrifugal force; and
and accelerating the pump motor in response to the acceleration of the washing motor.
The method of claim 1,
The method of controlling a washing machine further comprising draining water from the tub while step (d) is being performed. 3. The method of claim 2,
Steps (c) and (d) are repeatedly performed. The method of claim 1,
(c-1) rotating the washing motor in one direction at a constant speed so that the laundry on the inner circumferential surface of the drum rises by rotation of the drum and then falls while step (c) is performed control method. 5. The method of claim 4,
In step (c-1),
The rotation speed of the washing motor is,
A control method of a washing machine in which the laundry is set to fall after being raised to a position corresponding to a predetermined rotation angle between 90 and 100 degrees of rotation of the drum. 5. The method of claim 4,
In step (d), the washing motor,
A method of controlling a washing machine that is accelerated from the rotation speed of the washing motor in step (c-1). The method of claim 1,
The method of controlling a washing machine further comprising the step of dehydrating the laundry by rotating the washing motor at high speed when the operation of the pump motor is stopped, performed following step (d). 8. The method of claim 7,
The washing machine is
Further comprising a direct water nozzle for spraying the water supplied through the water supply valve into the drum,
The control method of the washing machine further comprising the step of opening the water supply valve and spraying water through the direct water nozzle while the step (d) is being performed. The method of claim 1,
In step (d), the pump motor accelerates the water flow sprayed through the circulation nozzle to a speed reaching the rear surface of the drum. A tub containing water, a drum rotatably provided in the tub, a circulation nozzle for spraying water into the drum, a washing motor rotating the drum, and water discharged from the tub to the circulation nozzle In the control method of a washing machine comprising a pump for pumping,
(a) supplying water together with detergent into the tub and rotating the drum to wash the laundry put into the drum;
(b) draining water from the tub;
(c) supplying water into the tub; and
(d) rotating the washing motor so that the laundry rotates together with the drum without falling on the inner circumferential surface of the drum, and driving a pump motor configuring the pump to spray water through the circulation nozzle,
Step (d) is,
and accelerating the pump motor while the drum is rotating.

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