KR20210031676A - Washing machine - Google Patents

Abstract

Disclosed is a washing machine. The washing machine of the present disclosure includes: a tub; a drum provided in the tub to be rotatable; a nozzle spraying water into the drum; a washing motor rotating the drum; a pump including a pump motor, and sending the water discharged from the tub to the nozzle; and a control part controlling the washing motor such that the drum can be rotated, and controlling the pump motor such that the water can be sprayed into the drum through the nozzle. The control part accelerates the washing motor such that a bag on the inner circumference surface of the drum is elevated without being dropped from the inner circumference surface by centrifugal force in a state in which water is stored in the tub, and then brakes the washing motor such that the bag is dropped from the inner circumference surface when the rotation angle of the drum reaches a preset motion angle. Moreover, the control part accelerates and rotates the pump motor from a lower limit of a preset rotation speed range while the washing motor is being accelerated and, after the rotation angle of the drum reaches the motion angle, can rotate the pump motor while decelerating the pump motor from an upper limit of the rotation speed range to the lower limit of the rotation speed range when the rotation speed of the pump motor reaches the upper limit of the rotation speed range. Therefore, the present invention is capable of improving washing performance and reducing energy consumption.

Description

Washing machine {WASHING MACHINE}

The present invention relates to a washing machine equipped with a circulation pump for circulating washing water.

In general, a washing machine is a device that separates contaminants from clothing, bedding, etc. (hereinafter, abbreviated as'laundry') by using chemical decomposition between water and detergent and physical action such as friction between water and laundry. It is collectively called.

Korean Patent Publication (Publication No. 2011-0040179) discloses a washing machine configured to circulate water discharged from a tub using a circulation pump, and inject 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.

In particular, in recent years, new technologies for controlling the rotation of the drum have been developed in order to impart diversity to the flow of laundry injected into the drum. However, when the water pressure sprayed through the nozzle is constant as in the prior art, there is a limit in which a remarkable performance improvement cannot be expected.

Patent Publication No. 10-2011-0040179

The problem to be solved by the present invention is: First, it is optimal by varying the speed of the pump motor according to the drum driving motion while performing a drum driving motion in which the laundry is raised to a certain height and then dropped, such as swing motion, step motion, or scrub motion. It is to provide a control method of a washing machine that provides the washing power of the washing machine.

A washing machine according to an aspect of the present disclosure includes a tub, a drum rotatably provided in the tub, a nozzle for spraying water into the drum, a washing motor for rotating the drum, a pump motor, and discharged from the tub. And a pump for pumping water to the nozzle, a control unit for controlling the washing motor to rotate the drum, and controlling the pump motor to spray water into the drum through the nozzle.

The controller accelerates the washing motor so that the carriage on the inner circumferential surface of the drum rises without falling from the inner circumferential surface by centrifugal force while water is contained in the tub, and then the rotation angle of the drum is a preset motion angle. When reaching, the washing motor may be braked so that the cloth falls from the inner circumferential surface.

The controller may accelerate and rotate the pump motor from a lower limit of a preset rotational speed range while the washing motor is accelerating.

The control unit, after the rotation angle of the drum reaches the motion angle, when the rotational speed of the pump motor reaches the upper limit of the rotational speed range, the pump motor is moved from the upper limit of the rotational speed range to the lower limit of the rotational speed range. It can decelerate and rotate up to.

A method of controlling a washing machine according to an aspect of the present disclosure includes a tub containing water, a drum rotatably provided in the tub, at least one nozzle spraying water into the drum, and a washing machine that rotates the drum. The present invention relates to a control method of a washing machine including a motor and a pump that pressurizes water discharged from the tub to the at least one nozzle.

The control method of the washing machine includes the steps of: (a) sensing the amount of cloth injected into the drum, and (b) when water is contained in the tub, the carriage on the inner circumferential surface of the drum rises without falling from the inner circumferential surface by centrifugal force. , After accelerating the washing motor, braking the washing motor so that the cloth falls from the inner circumferential surface, and (c) controlling the pump motor constituting the pump so that water is sprayed through the at least one nozzle. And accelerating in response to acceleration of the washing motor and decelerating in response to braking of the washing motor.

The acceleration and deceleration of the pump motor in step (c) is performed within a rotation speed range set according to the amount of cloth detected in step (a).

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

The control method of the washing machine according to the present invention, by varying the speed of the pump motor in response to the movement of laundry in the drum caused by the driving motion of the drum, improves washing performance, reduces energy consumption, and enhances bagging. It works. In particular, in varying the speed of the pump motor, it is possible to optimize the water flow sprayed through the nozzle in consideration of variables according to the fabric, such as the movement of the fabric and the area occupied by the fabric in the drum.

The effects of the present invention are not limited to the above-mentioned effects, 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 showing 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 block diagram showing a control relationship between main parts of a washing machine according to an embodiment of the present invention.
4 schematically shows the main configurations of a washing machine according to an embodiment of the present invention.
Fig. 5 schematically shows the drum viewed from the front, and shows the spraying ranges of each nozzle.
6 schematically shows the drum viewed from the side, and the spraying ranges of each nozzle are shown.
7 is a diagram showing drum driving motions that can be implemented in a washing machine according to an embodiment of the present invention.
8 is a graph comparing the cleaning power and vibration level of drum driving motions.
9 is a view referred to for explaining the spray motion in each drum driving motion of the present invention in comparison with the prior art.
10 is a flow chart showing a control method of the washing motor and the pump motor in the drum driving motion.
11 are graphs showing the speed (a) of the washing motor and the speed (b) of the pump motor in rolling motion and tumbling motion.
12 are graphs showing the speed (a) of the washing motor and the speed (b) of the pump motor in swing, scrub, and step motion.
13 are graphs 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 where a small amount of laundry is put into the drum, and (b) is a case where a large amount of laundry is put.
Fig. 15 is a graph comparing the speed of the pump motor in each drum driving motion, when the bag amount belongs to the first bag amount range (I) and when the bag amount belongs to the second bag amount range (II), "R". Is the rpm of the pump motor 92 in rolling motion, "T" is the rpm of the pump motor 92 in tumbling motion, and "SW" is the rpm fluctuation range "SC" of the pump motor 92 in swing motion The rpm fluctuation range of the pump motor 92 in scrub motion, "ST" is the rpm fluctuation range of the pump motor 92 in step motion, and "F" is the rpm fluctuation range of the pump motor 92 in the filtration motion. Is displayed.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and are common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same elements throughout the specification.

1 is a perspective view showing 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 block diagram showing 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 a washing machine, and an inlet 12h into which laundry is injected 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. I can. The bottom surface and the top surface of the cabinet 11 are open, and a 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 the open upper surface of the cabinet 11 and a control panel 14 disposed above the front panel 12.

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 approximately central opening and rotatably coupled to the front panel 12, and a window 22 installed at the opened 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 in the front so that laundry can be put into it, and the inlet is communicated with an inlet formed in the casing 10 by a gasket 60.

The gasket 60 is for preventing water contained in the tub 31 from leaking. The front end portion is overlapped with the front surface (or front panel 12) of the casing 10, the rear end portion is coupled to the inlet of the tub 31, and the front end portion and the rear end portion extend in a tubular shape. 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 portion 61 coupled around the inlet of the casing 10, a tub coupling portion 62 coupled around the inlet of the tub 31, and a tub coupling from the casing coupling portion 61 It may include an extension portion 63 extending to the portion 62.

The extension part 63 is formed with a flat portion 64 extending evenly from the casing coupling portion 61 toward the tub coupling portion 62, and between the flat portion 64 and the tub coupling portion 62 The folded portion 65 may be formed.

The foldable portion 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. Depending on the embodiment, the nozzles 83a and 83b may be integrally formed with the flat portion 64, but are not limited thereto, and a nozzle fastener (not shown) is formed on the flat portion 64, and the gasket 60 ) And an inlet pipe of a nozzle formed as a separate part (not shown, a pipe through which water pumped by a pump flows in) 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 from the outside of the gasket 60. It is connected to the inlet pipe.

In the front panel 12, the circumference of the inlet is rolled outward, and the casing coupling portion 61 is fitted in a 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 opening. It is firmly fixed in.

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

The drum 40 accommodates laundry, and is disposed so that an inlet into which the laundry is inserted is located at the front side, and is rotated about a substantially horizontal rotation center line (C). However, "horizontal" here is not a term used in a mathematically strict sense. That is, as in the embodiment, when the rotation center line C is inclined at a predetermined angle (for example, 5 degrees or less) with respect to the horizontal, it is also close to the horizontal, so it can be said to be 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 caused 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 drum 40 may be provided. Additives may be classified and accommodated in the dispenser 35 according to their types. The dispenser 35 may include a detergent receiving portion (not shown) for accommodating a detergent, and a softener accommodating portion (not shown) for accommodating a fabric softener.

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

Meanwhile, 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 regulates the direct water supply pipe 39.

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

The pump 36 may selectively perform a function of pumping water discharged through the drainage bellows 17 to the drain pipe 19 and a function of pumping the water discharged through the drainage bellows 17 to the circulating water guide pipe 18 to be described later.

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 92 (see FIG. 3) for rotating the impeller. . The pump housing includes an inlet port (not shown) through which water flows through the drain bellows 17, a drain discharge port (not shown) for discharging the water pumped by the impeller to the drain pipe 18, and the impeller. A circulating water discharge port (not shown) for discharging the compressed water to the circulating water guide pipe 18 may be formed.

The pump motor 92 may be capable of forward/reverse rotation. Depending on the direction in which the impeller is rotated, water may be discharged through the drainage discharge port or water may be discharged through the circulating water discharge port. This configuration can be implemented by appropriately designing the structure of the pump housing, and such a technique is already known in Korean Unexamined Patent Publication No. 10-2013-0109354, and a detailed description thereof will be omitted.

The inlet of the circulating water guide pipe 18 is connected to the circulating water discharge port, and the outlet is connected to nozzles 83a and 83b to be described later. However, the present invention is not limited thereto, and a circulation pump for pumping the water discharged from the tub 31 to the circulating water guide pipe 18 and a drain pump for pumping the water discharged from the tub 31 to the drain pipe 19 are separately provided. It can be provided. Under the control of a controller (not shown), a circulation pump may be operated according to a preset algorithm (eg, during washing) or the drainage pump may be operated (eg, when draining). Hereinafter, the pump 36 is exemplified as a circulation pump for both drainage and drainage.

Meanwhile, the pump motor 92 is a variable speed motor whose rotation speed is controlled. According to an embodiment, when a circulation pump is provided separately from the drainage pump, a pump motor constituting the circulation pump may be a variable speed motor. The 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 pump motor 92 may be further provided, and the driver may be an inverter driver. The inverter driver converts AC power into DC power and inputs it to the motor at a target frequency.

A control unit 91 for controlling the pump motor may be further provided. The control unit 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 pump motor 92 as an input, and based on this, the rotation speed (or rotation speed) of the pump motor 92 is set to a predetermined target rotation speed (or target The output value of the driver can be controlled to follow the number of revolutions).

On the other hand, the control unit 91 can control not only the pump motor 92 but also the overall operation of the washing machine, and the control of each part mentioned below is understood to be performed by the control of the control unit 91, even if not mentioned otherwise. Let's do it.

At least one nozzle 83a and 83b for spraying the circulating water pressurized by the pump 36 into the drum 40 may be provided. In the embodiment, the nozzles 83a and 83b provided on both left and right sides of the gasket 60 are configured to spray water upward from the lower side of the drum 40, but are 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 discharge water pressure of the pump 36, the discharge As the flow rate, rotational speed or rotational speed increases), it is preferable to include at least one nozzle configured to spray water further upward.

The outlet of each nozzle (83a, 83b) may be opened upward 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 a direction inclined upward to the inside of the drum 40, and the sprayed water reaches the depth of the drum 40. You can do this.

On the other hand, when the water pressure of the water supplied to the nozzles 83a and 83b is insufficient, 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 ) You cannot reach deep inside.

In FIG. 4, the injection form when water is supplied by the pump 36 at a sufficient water pressure is indicated by "a", and when the water pressure is lower than that, it is indicated by "b". That is, as the rotational speed of the pump 36 is varied, the shape of the water flow sprayed through the nozzles 83a and 83b may vary between a and b.

Fig. 5 schematically shows the drum viewed from the front, and shows the spraying ranges of each nozzle. 6 schematically shows the drum viewed from the side, and the spraying ranges of each nozzle are shown.

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

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

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

Referring to FIG. 6, the drum 40 viewed from the side is divided into three, and a first region, a second region, and a third region are sequentially defined from the front. When the length in the front-rear direction of the drum 40 is L, the first area is from the front end of the drum 40 to (1/3)L, and the second area is from (1/3)L to (2/ 3) up to L, and the third area is from (2/3) L to L. For reference, M denotes the center of the drum 40 ((1/2)L).

As the rotational speed of the pump motor 92 gradually increases, the water flow injected from the nozzles 83a and 83b reaches a deeper position of the drum 40. As exemplarily shown in the drawing, when the rotational speed of the pump motor 92 is 2200 rpm, the water flow injected from the nozzles 83a and 83b reaches within the first area of the inner circumferential surface 42 of the drum 40, and 2500 rpm In the case of, it reaches in the second area, and in the case of 2800 rpm, it reaches in the third area. When the rotational speed of the 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, and at 3400 rpm. The water flow reaches 2/3 of the height (H) of the drum (40). When the rotational speed of the pump motor 92 reaches 3400 rpm, the height at which the water flow reaches the maximum, and due to the structure of the nozzles 83a and 83b, the injection height does not increase anymore, and only the strength of the water flow is strengthened. do.

7 is a diagram showing drum driving motions that can be implemented in 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 located inside the drum 40 changes in the falling direction or the point of dropping by the drum driving motion, and as a result, the drum 40 ) The flow of laundry inside will be different. The drum driving motion is implemented by controlling the washing motor 93 by the controller 91.

When the drum 40 is rotated, the laundry is raised by the lifter 45 provided on the inner circumferential surface of the drum 40, so that the impact applied to the laundry can be varied by controlling the rotational speed and direction of the drum 40. do. In other words, it is possible to vary mechanical forces such as friction between laundry, friction between laundry and wash water, and drop impact of laundry. In other words, it is possible to vary the degree of patting or rubbing the laundry for washing, and the degree of dispersion or overturning of the laundry can be varied.

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

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

7A is a diagram showing a rolling motion. In the rolling motion, the washing motor 93 rotates the drum 40 in one direction (preferably, at least one rotation), but the laundry on the inner circumferential surface of the drum 40 is less than about 90 degrees in the rotation direction of the drum 40. It is a motion controlled to fall from the position toward the lowest point of the drum 40.

For example, when the washing motor 93 rotates the drum 40 at about 37 to 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 the drum 40 It flows toward the lowest point of the drum 40 as if rolling at a position less than about 90 degrees in the rotation direction from the lowest point of ). Visually, when the drum 40 rotates in a clockwise direction, laundry continuously rolls in the third quadrant of the drum 40.

In rolling motion, laundry is washed through friction with washing water, friction between laundry, and friction with the inner circumferential surface of the drum 40. At this time, the laundry is sufficiently overturned 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. Due to the difference in size between the centrifugal force and the gravity, the flow of laundry in the drum 40 is changed. Of course, the rotational force of the drum 40 and the frictional force between the drum 40 and the laundry must also be considered. In this way, 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 less 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, at least one rotation), but the laundry on the inner circumferential surface of the drum 40 is about 90 degrees to 110 degrees in the rotation direction of the drum 40. It is a motion controlled to fall from the position to the lowest point of the drum 40. The tumbling motion is a drum driving motion generally used during washing and rinsing since mechanical force is generated only by controlling the drum 40 to rotate in one direction at an appropriate rotational speed.

That is, the laundry put into the drum 40 is located 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 caused by friction between 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 a position of 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 the centrifugal force is generated greater than that of the rolling motion, but less than the gravity.

Visually, the tumbling motion is, when the drum 40 rotates in a clockwise direction, the laundry rises from the lowest point of the drum 40 to a position of 90 degrees or to the second quadrant, and then separated into the inner circumferential surface of the drum 40 to the lowest point of the drum 40. It is in the form of falling toward.

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

The step motion and scrub motion described below are commonly performed in a state where the rotation angle of the carriage drum 40 located at the lowest point of the drum 40 reaches a height corresponding to the set angle from 90 degrees or more and less than 180 degrees. , The setting angle of the step motion has a higher band value than that of the scrub motion.

7C is a diagram showing a step motion. In step motion, the washing motor 93 rotates the drum 40 in one direction (preferably, it does not reach one rotation), but the laundry on the inner circumference of the drum 40 is near the highest point of the drum 40 (preferably , Although a position of about 146 to 161 degrees in the rotational direction of the drum 40, it is not necessarily limited thereto, and an angular position greater than 161 degrees is also possible within a range not exceeding 180 degrees.) of the drum 40 It is a motion controlled to fall toward 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 by centrifugal force (that is, the speed at which laundry is rotated together with the drum 40 while sticking to the inner circumferential surface of the drum 40 by centrifugal force) It is a motion to maximize 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 dropping 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 rotation angle of the drum 40 reaches a set angle, a torque in the direction opposite to the rotation direction of the drum 40 can be controlled to be applied to the washing motor 93. have.

Since the laundry rises from the lowest point of the drum 40 along the rotational direction of the drum and then falls to the lowest point while the drum 40 stops, the laundry becomes the maximum drop compared to other drum driving motions, thus acting on the laundry. The impact force is also maximized.

Visually, the step motion is, when the drum 40 rotates clockwise, the laundry located at the lowest point of the drum 40 rises to the maximum after passing through the 3rd and 2nd quadrants, and then suddenly separated from the inner circumferential surface of the drum 40. It falls toward the lowest point of 40). Therefore, the step motion has the largest drop of laundry and the smaller the amount of cloth, the more effective the mechanical power is provided.

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. In order to induce 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, and sudden braking is enabled in this manner. 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. That is, after applying torque to rotate in the forward direction, torque is applied to instantaneously rotate in the reverse direction to abruptly stop, and then, torque is applied to rotate in the forward direction to realize step motion.

In step motion, when the drum 40 is rotated, the washing water flowing through the through hole 47 formed in the drum 40 is rubbed against the laundry, and when the laundry is located at the highest point of the drum 40, it is dropped to prevent impact force. It can be said that it is a washing motion.

7D is a diagram 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 rotation direction of the drum 40 (preferably, about 30 to about 30 in the rotation direction of the drum 40). It is a motion controlled so that the laundry falls at a 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 located 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 a position of about 90 degrees in the counterclockwise direction, and thus, the drum 40 is at a position less than about 90 degrees in the counterclockwise direction. It moves toward the lowest point of.

After the drum 40 stops rotating in this way, the washing motor 93 rotates the drum 40 clockwise this time at about 40 RPM so that the laundry changes the rotation direction (ie, clockwise) of the drum 40. Accordingly, it is to be raised to a predetermined height. And, before the laundry reaches a position of about 90 degrees in the clockwise direction, the washing motor 93 is controlled so that the rotation of the drum 40 is stopped, so that the laundry is at a position less than about 90 degrees in the clockwise direction. It falls toward the lowest point of.

That is, the swing motion is a motion in which forward rotation/stop and reverse rotation/stop of the drum 40 are repeated. Visually, the laundry located at the lowest point of the drum 40 passes through the third quadrant of the drum 40 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 is a form in which laundry flows in an eight-shaped shape lying on the side across the third and fourth quadrants of the drum 40.

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

Power generation braking is a braking method that uses the washing motor 93 to act as a generator by 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 abruptly brake the washing motor 93, and allows the rotation direction of the drum 40 to be smoothly switched.

7E is a view showing a scrub motion. The scrub motion is a motion in which the washing motor 93 rotates the drum 40 alternately in both directions, but the laundry is controlled to fall at a position of about 90 degrees or more in the rotation direction of the drum 40.

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

Thereafter, the washing motor 93 rotates the drum 40 in the reverse direction at about 60 rpm or more, and raises 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, when it reaches a position corresponding to 139 to 150 degrees, the washing motor 93 provides reverse torque to the drum 40 again, thereby temporarily stopping the rotation of the drum 40). At this time, the laundry on the inner circumferential 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.

In the scrub motion, laundry is washed by causing the laundry to fall rapidly from a predetermined height. At this time, it is preferable that the washing motor 93 is braked in reverse phase for braking of the drum 40.

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

In the scrub motion, the laundry that has moved from the 3rd quadrant in the forward direction to the 2nd quadrant falls sharply, then moves in the reverse direction to the 1st quadrant after passing through the 4th quadrant, and then falls repeatedly. Therefore, visually, it can be said that the laundry rises and then falls along the inner circumferential surface of the drum 40 repeatedly.

7F is a diagram 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 into the drum 40 through the nozzles 83a and 83b. It is a motion to spray.

After the laundry is spread, it is in close contact with the inner circumferential surface of the drum 40 and is sprayed into the inside of the drum 40 during rotation, so that the sprayed laundry water penetrates the laundry by centrifugal force, and then the through hole 47 of the drum 40 ) To exit to the tub (31).

The filtration motion increases the surface area of the laundry, while the washing water permeates the laundry, so there is an effect that the laundry is evenly wetted.

7G is a diagram showing a squeeze motion. In the squeeze motion, after 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, the rotational speed of the drum 40 is lowered to remove the laundry from the inner circumferential surface of the drum 40. This is a motion of repeating the separation operation and spraying washing water into the drum 40 through the nozzles 83a and 83b while the drum 40 is rotating.

Filtration motion continuously rotates the laundry at a speed that does not fall off the inner circumferential surface of the drum 40, but the squeeze motion repeatedly adheres and separates the laundry to the inner circumferential surface of the drum 40 by changing the rotational speed of the drum 40. There is a difference in

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

The step motion and scrub motion have excellent cleaning power and are suitable for the case of severe 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 in the case where the laundry is sensitive clothing or a washing course in which noise and vibration need to be minimized.

Rolling motion is a motion characterized by excellent cleaning power, low vibration level, minimization of laundry damage and low motor load. Therefore, it can be applied to all washing courses, but in particular, it is a motion suitable for dissolving detergent and wetting laundry at the beginning of washing. However, rolling motion has a disadvantage that it takes longer to wash when washing to the same level as compared to the tumbling motion instead of having a low vibration level.

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 is particularly useful in the step for foam dispersion.

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

In the filtration motion, the cleaning power is lower than that of the squeeze motion, and the degree of noise is similar to the rolling motion. Filtration motion is a useful motion when the laundry is wetted or when detergent water is added to the laundry at the beginning of washing because the laundry water penetrates 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 gentle care of sensitive clothes.

9 is a view referred to for explaining the spray motion in each drum driving motion of the present invention in comparison with the prior art. Figure 9 (a) is a graph showing the rotational speed of the drum 40 or the washing motor 93 for each drum driven motion, (b) is a conventional washing machine equipped with a constant speed pump, at the time of each drum driven motion It is a graph showing the rotational speed of the pump motor, (c) is a graph showing the rotational speed of the pump motor 92 during each drum driving motion in the washing machine according to an embodiment of the present invention, (d) is The movement of laundry in each drum driving motion is shown, and (e) is an injection form through the nozzles 83a and 83b during each drum driving motion in the washing machine according to an embodiment of the present invention (hereinafter, "spraying It is referred to as "motion").

Referring to FIG. 9, since the conventional washing machine cannot change the speed of the pump motor, even if the drum driving motion is different, the pump motor must always be rotated at a constant speed. Accordingly, the water flow sprayed through the nozzle in a conventional washing machine cannot effectively cope with the movement of the fabric caused by the type of drum driving motion, and it is difficult to manage power consumption, washing performance, and bagging performance. The present invention attempts to solve the above problems by appropriately controlling the rotational speed of the pump motor 92 according to the drum driving motion, and further, considering the amount of cloth in this process.

In particular, the carriage rises in a state attached to the inner circumferential surface 42 of the drum 40 by the rotating drum 40, and then separates and falls from the inner circumferential surface 42 by braking of the drum 40 when it reaches a predetermined height. In the case of the drum driving motions (hereinafter referred to as "free fall-inducing motion by braking". For example, swing motion, step motion, or scrub motion), the rotational speed of the pump motor 92 is varied within a predetermined range. , The range is set according to the amount of fabric.

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

Meanwhile, referring to (c) of FIG. 9, in the case of rolling motion, swing motion, step motion, scrub motion, and filtration motion, the rpm of the pump motor 92 may be controlled in a different manner. In the drawing, the rpm of the pump motor 92 in the case of a large amount of cloth is shown by a solid line, and the rpm of the pump motor 92 in the case of a small amount of cloth is indicated by a dotted line. In the case of the tumbling motion, the rpm of the pump motor 92 may be controlled in the same manner regardless of the amount of cloth.

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

During the operation of the washing machine, when a preset drum driving motion is performed, the controller 91 controls the washing motor 93 and the pump motor 92 according to a method determined for each drum driving motion.

Specifically, the control unit 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 it reaches (A3), the control unit 91 may control the washing motor 93 to be decelerated (A4).

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

On the other hand, in the case of free fall-inducing motion by braking such as swing motion, step motion, scrub motion, etc., the motion angle (θ) is appropriate according to the characteristics of each drum driving motion within 180 degrees to induce the fall of the gun. It is set to a value. For example, the motion angle θ may be 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. .

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

On the other hand, when driving of the washing motor 93 is started in step A1, the control unit 91 applies a start signal SG1 to the pump motor 92, and the pump motor 92 responds to the start signal SG1. The drive of is started (B1). Thereafter, the control unit 91 accelerates the pump motor 92 according to a setting determined for each drum driving motion based on the motion information (ie, 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 control unit 91 applies the angle control completion signal SG2 to the pump motor 92.

In the case of a free fall inducing motion by braking, the pump motor 92 at B2 responds to the angle control completion signal (SG2), after the rotational speed reaches the upper limit value (Pr(V, H)) set for each drum driving motion. , Stop acceleration (or braking of the pump motor 92), and deceleration is performed according to a setting set for each drum driving motion (B4, B5).

Thereafter, in step A5, when driving of the washing motor 93 is started again, the control unit 91 applies a restart signal SG3 to the pump motor 92, and the pump motor 92 receives a restart signal SG3. In response to ), when the rotational speed reaches the lower limit value (Pr(V, L)) set for each drum driving motion, the 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 pump motor 92, the pump motor 92 rotates while maintaining the rotational speed determined for each drum driving motion. In progress. Therefore, in the case of these motions, in response to the angle control completion signal SG2, the deceleration of the pump motor 92 is performed (B4).

On the other hand, in the case of any drum driven motion, when the washing motor 93 is stopped in step A6, the control unit 91 applies a stop signal SG4 to the pump motor 92, and according to the stop signal SG4. The pump motor 92 is stopped.

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

11 are graphs showing the speed (a) of the washing motor and the speed (b) of the pump motor in rolling motion and tumbling motion. FIG. 15 is a graph comparing the speed of the pump motor in each drum driving motion, when the bag amount belongs to the first bag amount range (I) and when the bag amount belongs to the second bag amount range (II).

Referring to FIGS. 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 water can be sprayed through the nozzles 83a and 83b. Referring to FIG. 11, during rolling motion, the control unit 91 controls the washing motor 93 so that the laundry on the inner circumferential surface of the drum 40 reaches a position corresponding to the rotation angle of the drum 40 less than approximately 90 degrees. The drum 40 is rotated in one direction so as to fall from the elevated position. During the rolling motion, the washing motor 93 or the drum 40 may be accelerated to the rotational speed Dr(R) and then rotated while maintaining the Dr(R) for a certain period of time. The rotational speed Dr(R) is preferably 37 to 40 rpm, but is not necessarily limited thereto.

During the rolling motion, the rotational speed of the pump motor 92 is controlled by a preset rotational speed Pr(R). In FIG. 11, t(SG1) is the time when the start signal SG1 is generated, t(SG2) is the time when the angle control completion signal SG2 is generated, and t(SG3) is the time when the restart signal SG3 is generated. . Hereinafter, the same is displayed in FIGS. 12 to 13 (in FIG. 12, t(SG4) is the time when the stop signal SG4 is generated).

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

The control unit 91 may set the rotational speed Pr(R) according to the range of the detected cloth weight. For example, the cloth amount may be subdivided into a first level to a ninth level, and the cloth amount range is a small amount (or a first cloth amount range (I), see Fig. 15) and a large amount (or a second cloth amount range (or a second cloth amount range). II), see Fig. 15.), the detected cloth quantity can be classified as a small quantity if the first level to the fourth level, and a large quantity if the quantity is from the 5th level to the ninth level. However, the present invention is not limited thereto, and it is also possible to classify the range for each level.

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

On the contrary, when the amount of cloth is large, the cloth is filled up to the center of the drum 40, so that 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, and thus, the water flow is restricted. It is preferable to reach the first quadrant Q1 and the second quadrant Q2, and for this purpose, the rotational speed of the pump motor 92 is set to approximately 3000 rpm or higher, preferably 3100 rpm.

In the case of the tumbling motion, the washing motor 93 and the pump motor 92 are controlled in a manner similar to that of the rolling motion. However, the rotational speed of the washing motor 93 (Dr(R) is higher than in the case of rolling motion, and the rotational speed (Pr(T)) of the pump motor 92 is also higher than in the case of rolling motion for the same amount of cloth. Meanwhile, the rotational 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 fabric than in the case of the rolling motion, and the water flow pressure injected through the nozzles 83a and 83b needs to be sufficient regardless of the amount of the fabric. Accordingly, in the case of the tumbling motion, the pump motor 92 may be rotated at a constant speed having a value between 3400 and 3600 rpm regardless of the amount of cloth. However, the present invention is not limited thereto, and it is of course possible to set the rotational speed Pr(T) higher than the case of a large amount of cloth or a small amount of cloth. For example, when the amount of cloth is small, the rotational speed Pr(T) may be set to 3400 rpm, and when the amount is large, it may be set to 3600 rpm.

12 are graphs showing the speed (a) of the washing motor and the speed (b) of the pump motor in swing, scrub, and step motion. Referring to FIGS. 12 and 15, in the case of a free fall-inducing motion by braking, the control unit 91 controls the rotational speed of the pump motor 92 to vary while the drum 40 is being rotated.

The free fall inducing motion by braking is performed in a state in which water is immersed in the tub 31 so that water can be sprayed through the nozzles 83a and 83b. In the fall-inducing motion caused by braking, the control unit 91 controls the washing motor 93 to increase the speed at which 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 the laundry falls from the inner circumferential surface 42. That is, in the free fall-inducing motion by braking, the washing motor 93 rises to a preset rotational speed Dr(V) and then decelerates until it stops.

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

However, the maximum rising height of the gun in the free fall-inducing motion 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 ascending height of the fore (or the height at which the fore starts to fall) may also vary. have. In any case, it is preferable that the motion angle θ is set higher 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 between 30 and 45 degrees for swing motion, 139 degrees to 150 degrees for scrub motion and 146 degrees to 161 degrees for step motion Can be set to a value.

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

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

For example, in the case of the scrub motion, when the detected cloth quantity falls within a small amount (or the first cloth quantity range (I), see Fig. 15), the rotation speed of the pump motor 92 is the lowest rotation speed (Pr(V)). , L)) can be varied between 2800rpm and the maximum rotational speed (Pr(V, H)) of 3100rpm. And, when the detected cloth quantity is large (or the second cloth quantity range (II), see Fig. 15), the rotational speed of the pump motor 92 is 3400rpm, which is the lowest rotational speed (Pr(V, L)), and the highest. It can be varied between 3600 rpm, which is the rotational speed (Pr(V, H)).

In the case of step motion, when the detected cloth quantity falls within a small amount (or the first cloth quantity range (I), see Fig. 15), the rotation speed of the pump motor 92 is the lowest rotation speed (Pr(V, L)) It can be varied between 2200rpm which is phosphorus and 2500rpm which is the maximum rotational speed (Pr(V, H)). And, when the detected cloth quantity is large (or the second cloth quantity range (II), see Fig. 15), the rotational speed of the pump motor 92 is 3400rpm, which is the lowest rotational speed (Pr(V, L)), and the highest. It can be varied between 3600 rpm, which is the rotational speed (Pr(V, H)).

Meanwhile, even in the case of swing motion, a range in which the rotational speed of the pump motor 92 is variable according to the amount of cloth may be set in the same manner as the scrub motion or the step motion. At this time, the pump motor 92 is set within a range in which the water flow injected from the nozzles 83a and 83b does not reach the rear surface 41 of the drum 40 (eg, 2200 to 2800 rpm, see FIG. 6 ). It is desirable.

However, in the case of swing motion, since the fall of the cloth is not large compared to the scrub motion or step motion, the rotation speed range of the pump motor 92 may be fixed regardless of the amount of cloth. For example, the carriage In both small and large amounts, the pump motor 92 can be varied between 2200 rpm, which is the minimum rotational speed (Pr(V, L)) and 2800rpm, which is the maximum rotational speed (Pr(V, H)). .

13 are graphs 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 where a small amount of laundry is put into the drum, and (b) is a case where a large amount of laundry is put.

13 to 15, while the filtration motion is being performed, the control unit 91 controls the rotational speed of the pump motor 92 while the drum 40 is rotated in one direction (preferably at least one rotation). Control so that Pr(F)) 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 increases, and the inner circumferential surface of the drum 40 in order from the laundry located close to the inner circumferential surface of the drum 40 Adheres to or adheres to. That is, in the process of increasing the rotational speed of the drum 40 during the filtration motion and reaching a preset rotational speed (Dr(F)), at the beginning, sufficient centrifugal force is applied to the laundry located in the center of the drum 40. When 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 reduced. It is fixed.

In particular, when the amount of laundry put into the drum 40 is less than a certain level, laundry generally collects at the inlet side of the drum 40 during filtration motion (refer to FIG. 14(a)). In this case, it is preferable to control the rotational speed of the pump motor 92 to be low so that the circulating water injected from the nozzles 83a and 83b falls in front of the drum 40.

Conversely, when the amount of laundry put in the drum 40 is more than a certain level, in the process of increasing the rotational speed of the drum 40, the empty space surrounded by the laundry expands from the entrance of the drum 40 to the rear. In the end, the shape as shown in FIG. 14B is achieved. Controlling the rotational speed of the pump motor 92 to increase while the filtration motion is being performed is conceived from the expansion mechanism of the empty space in the drum 40 as described above found in the course of the filtration motion. will be. That is, in the process of expanding the empty space to the rear of the drum 40, the injection pressure of the nozzles 83a and 83b is also increased in conjunction with each other so that the water flow can reach deep inside the drum 40. will be.

In the filtration motion, the controller 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 rotational speed Dr(F) differs from the inner circumferential surface of the carriage drum 40 and is determined within a range in which the minute is rotated in a state, and its value may vary depending on the amount of cloth, but is approximately set between 80 and 108 rpm.

In the filtration motion, the maximum rotational speed of the pump motor 92 is set according to the amount of cloth. That is, the control unit 91 may set the maximum rotational speed Pr(F) according to the detected amount of cloth. Compared to the case in which the detected amount of cloth falls within a small amount (or the first cloth amount range (I), see Fig. 15), when it falls within a large amount (or the second cloth amount range (II), see Fig. 15), the maximum rotational speed is The speed Pr(F) may be set to a larger value.

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 pertains without departing from the gist of the present invention claimed in the claims. Various modifications may be possible by those of ordinary skill in the art, and these modifications should not be understood individually from the technical spirit or prospect of the present invention.

Claims (8)

Tub;
A drum rotatably provided in the tub;
A nozzle for spraying water into the drum;
A washing motor rotating the drum;
A pump provided with a pump motor and pressurizing water discharged from the tub to the nozzle; And,
And a control unit for controlling the washing motor to rotate the drum, and for controlling the pump motor to spray water into the drum through the nozzle,
The control unit,
In a state in which water is immersed in the tub, after accelerating the washing motor so that the carriage on the inner circumferential surface of the drum rises without falling from the inner circumferential surface by centrifugal force, the carriage is Braking the washing motor to fall from the inner circumferential surface;
While the washing motor is accelerating, accelerating and rotating the pump motor from a lower limit of a preset rotational speed range; And,
After the rotation angle of the drum reaches the motion angle, when the rotation speed of the pump motor reaches the upper limit of the rotation speed range, the pump motor decelerates and rotates from the upper limit of the rotation speed range to the lower limit of the rotation speed range. Letting washing machine. The method of claim 1,
The motion angle is a value less than 90 degrees,
In a state in which the rotation angle of the drum reaches the motion angle, the fabric positioned at the lowest point of the drum reaches a height corresponding to the motion angle. The method of claim 2,
The motion angle is a washing machine having a value between 30 degrees and 35 degrees. The method of claim 3,
The rotational speed range is set within a range in which the water flow sprayed from the nozzle does not reach the rear surface of the drum. The method of claim 1,
The motion angle is a value of 90 degrees or more and less than 180 degrees,
In a state in which the rotation angle of the drum reaches the motion angle, the fabric positioned at the lowest point of the drum reaches a height corresponding to the motion angle. The method of claim 5,
The motion angle is a washing machine having a value within 139 to 150 degrees. The method of claim 5,
The upper limit of the rotation speed range is,
A washing machine that is set within a range in which the water flow sprayed from the nozzle reaches the rear surface of the drum. The method of claim 5,
The motion angle is a washing machine having a value within 146 to 161 degrees.

Images