EP3887589B1 - Washing machine and control method thereof - Google Patents
Washing machine and control method thereof Download PDFInfo
- Publication number
- EP3887589B1 EP3887589B1 EP20776565.2A EP20776565A EP3887589B1 EP 3887589 B1 EP3887589 B1 EP 3887589B1 EP 20776565 A EP20776565 A EP 20776565A EP 3887589 B1 EP3887589 B1 EP 3887589B1
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- European Patent Office
- Prior art keywords
- acceleration section
- drum
- start time
- rotational speed
- laundry
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- 238000005406 washing Methods 0.000 title claims description 31
- 238000000034 method Methods 0.000 title claims description 9
- 230000001133 acceleration Effects 0.000 claims description 104
- 230000006870 function Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000105 evaporative light scattering detection Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Images
Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
- D06F34/18—Condition of the laundry, e.g. nature or weight
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F21/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement
- D06F21/02—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement about a horizontal axis
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
- D06F33/48—Preventing or reducing imbalance or noise
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/30—Driving arrangements
- D06F37/304—Arrangements or adaptations of electric motors
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/02—Characteristics of laundry or load
- D06F2103/04—Quantity, e.g. weight or variation of weight
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/24—Spin speed; Drum movements
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/44—Current or voltage
- D06F2103/46—Current or voltage of the motor driving the drum
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
- D06F2105/48—Drum speed
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
- D06F34/16—Imbalance
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/30—Driving arrangements
- D06F37/32—Driving arrangements for rotating the receptacle at one speed only
- D06F37/34—Driving arrangements for rotating the receptacle at one speed only in opposite directions, e.g. oscillating
Definitions
- the disclosure relates to a washing machine configured to determine a mass of laundry.
- Patent Document 1 discloses a technique that detects the mass of laundry based on rise time and fall time of a rotational speed of a motor.
- EP 3299504 A1 discloses a washing machine to measure mass of laundry using an inertial torque.
- a washing machine is provided as defined in claim 1.
- a control method of a washing machine is provided as defined in a further independent claim 14.
- any particular controller may be centralized or distributed, whether locally or remotely.
- various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium.
- application and “program” refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in a suitable computer readable program code.
- computer readable program code includes any type of computer code, including source code, object code, and executable code.
- computer readable medium includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory.
- ROM read only memory
- RAM random access memory
- CD compact disc
- DVD digital video disc
- a "non-transitory” computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals.
- a non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device.
- FIGS. 1 through 5 discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device.
- FIG. 1 is a view illustrating a structure of a washing machine 100 according to an embodiment of the disclosure.
- the washing machine 100 includes a drum 110 in which laundry is accommodated, a motor 120 configured to rotate the drum 110, a controller 130 configured to control rotation of the motor 120, a sensor 140 configured to detect a rotational speed of the drum 110, and a processing portion 150.
- controller 130 and the processing portion 150 may be implemented with at least one processor.
- the sensor 140 detects a rotation angle of the drum 110 in addition to the rotational speed of the drum 110.
- the processing portion 150 may determine the mass of the laundry based on the rotational speed in first and second acceleration sections to be described later.
- the rotational speed of the drum 110 is used.
- the sensor 140 is a position sensor configured to directly detect the rotational speed of the drum 110, but is not limited thereto. Therefore, the sensor 140 may be any suitable sensor.
- the processing portion 150 may typically include at least one processor 152 and a memory 154.
- the processor 152 executes a computer program configured to process of controlling the rotation of the drum 110 and the motor 120 and configured to process of obtaining the mass of the laundry.
- the memory 154 typically stores such computer programs and associated data.
- the processor 152 outputs a signal for controlling the rotation of the motor 120 to the controller 130.
- the controller 130 drives the motor 120 based on the control signal from the processor 152.
- FIG. 1 illustrates that the controller 130 and the processing portion 150 are separate functional blocks, but may be implemented as a single functional block.
- FIG. 2 is a view illustrating a profile 200 of intermittent driving of the motor 120 for obtaining a mass of laundry according to an embodiment of the disclosure.
- a horizontal axis represents the time
- a vertical axis represents the rotational speed of the drum 110.
- the profile 200 includes a first constant speed section 211, a first acceleration section 212, a stop section 215, a second constant speed section 221, and a second acceleration section 222.
- a sign of the rotational speed indicates a rotational direction of the drum 110. Therefore, from time 0 (zero) to the stop section 215, the drum 110 rotates in one direction, and thereafter rotates in the opposite direction.
- the controller 130 controls the rotation of the motor 120 to allow an absolute value of the rotational speed of the drum 110 at the start of the first acceleration section 212 to be the same as an absolute value of the rotational speed of the drum 110 at the start of the second acceleration section 222 and to allow sings thereof to be opposite to each other.
- FIG. 3 is a view illustrating a profile 300 of intermittent driving of the motor 120 for obtaining a mass of laundry according to an embodiment of the disclosure.
- a horizontal axis represents the time
- a vertical axis represents the rotational speed of the drum 110.
- the profile 300 includes a first constant speed section 311, a first acceleration section 312, a second constant speed section 321, and a second acceleration section 322. Unlike the profile 200, the profile 300 does not include a stop section.
- the constant speed section, the acceleration section, and the deceleration section may be provided prior to the first constant speed section 311. Accordingly, a position of the laundry in the drum 110 may be fixed in advance.
- the controller 130 controls the rotation of the motor 120 to provide the first constant speed section 311, in which the rotational speed of the drum 110 is constant, prior to the first acceleration section 312 and to provide the second constant speed section 321, in which the rotational speed of the drum 110 is constant, prior to the second acceleration section 322.
- FIG. 4 is a view illustrating an eccentric position due to uneven distribution of the laundry in the drum 110 according to an embodiment of the disclosure.
- the drum 110 rotates about a rotation axis 410.
- Laundry 420 in the drum 110 may have an uneven distribution as illustrated in FIG. 4 .
- a center 430 of the drum 110 is also shifted from the rotation axis 410 due to the uneven distribution of the laundry 420.
- an angle of the center 430 with respect to the reference line 440 corresponds to an eccentric position 450 caused by the uneven distribution of the laundry 420 in the drum 110.
- the eccentric position 450 may be set in a range of 0 to 360 degrees.
- the position of the drum 110 is represented by the eccentric position 450, which may be named as a phase.
- a start time of the first acceleration section and the second acceleration section corresponds to two points in which the eccentric position 450 caused by the uneven distribution of the laundry 420 in the drum 110 is shifted by 180 degrees.
- the eccentric position 450 at a start time of the first acceleration section 312 is 270 degrees
- the eccentric position 450 at a start time of the second acceleration section 322 is 90 degrees. Therefore, the start time of the first acceleration section 312 and the second acceleration section 322 corresponds to the two points in which the eccentric position 450 caused by the uneven distribution of the laundry 420 in the drum 110 is shifted by 180 degrees.
- a start time of the first acceleration section 212 and the second acceleration section 222 corresponds to two points in which the eccentric position 450 caused by the uneven distribution of the laundry 420 in the drum 110 is shifted by 180 degrees.
- the drum 110 rotates n times (n: natural number) in the first acceleration section and the second acceleration section.
- n natural number
- the drum 110 rotates once in the first acceleration section 312 and the second acceleration section 322, but it is not limited thereto. Therefore, as long as the number of rotation of the drum 110 in the first acceleration section 312 is the same as the number of rotation of the drum 110 in the second acceleration section 322, the drum 110 may rotate n times (n: natural number) other than once.
- the number of rotation" of the drum represents the number of times in which the drum rotates. For example, the drum 110 may rotate two times in the first acceleration section 312 and the second acceleration section 322.
- the processing portion 150 obtains the mass based on the mass detected in the first and second acceleration sections.
- the acceleration in the first and second acceleration sections depends on the mass of the laundry 420.
- the processing portion 150 may obtain the mass of the laundry 420 based on the increase amounts of the two rotational speeds in the first and second acceleration sections.
- an angle of the rotation axis of the drum 110 of the washing machine 100 according to the disclosure with respect to the horizontal direction is from 0 (zero) degree to 45 degrees.
- a washing machine operated in this range includes a washing machine that is commonly referred as "a drum type washing machine".
- the rotation axis of the drum 110 is relatively close to the horizontal direction. Accordingly, due to the gravity, the rotational speed may be reduced when the eccentric position 450 moves up and the rotational speed may be increased when the eccentric position 450 moves down. Even when such a variation in the rotational speed occurs, it is possible to obtain a value closer to the true mass of the laundry 420 based on the two mass values of the laundry 420 obtained separately in the first acceleration section and the second acceleration section, which will be described later.
- the start time of the first acceleration section 312 and the second acceleration section 322 corresponds to the two points in which the eccentric position 450 caused by the uneven distribution of the laundry 420 in the drum 110 is shifted by 180 degrees, it is possible to reduce an error that may occur when detecting the mass of the laundry 420.
- This effect is also obtained in the example of FIG. 2 . It is appropriate to determine the mass of the laundry 420 based on an average of two masses detected in the first and second acceleration sections. Accordingly, the processing portion may more reduce the error that may occur when detecting the mass of the laundry 420.
- the imbalance is a parameter determined by a weight corresponding to the uneven distribution of the laundry 420 in the drum 110 and a distance of the laundry 420 from the rotation axis 410. As the weight and the distance are increased, the imbalance may be increased.
- a stop section of the motor 120 is generated. In the stop section, the centrifugal force is lost, and the laundry 420 attached to the side of the drum 110 falls down in the vertical direction and thus the arrangement of the laundry 420 may be changed.
- the eccentric position and the unbalance amount change.
- the eccentric position is corrected by monitoring the phase of the rotational speed or the like, but the imbalance is not corrected. Therefore, the profile 200 has a larger deviation than the profile 300.
- the profile 300 is more appropriate than the profile 200.
- the first acceleration section 312 and the second acceleration section 322 are generated during continuous driving of the drum, and the rotational speed of the drum is maintained at 30 rpm or more in the first acceleration section 312 and the second acceleration section 322.
- Rpm may mean revolutions per minute of the motor and the drum.
- the movement of the laundry 420 in the drum 110 may be reduced between the first acceleration section 312 and the second acceleration section 322.
- the error at the detection of the mass of the laundry 420 may be reduced.
- the start time of the first acceleration section (for example 312) and the second acceleration section (for example 322) corresponds to the two points in which the eccentric position 450 caused by the uneven distribution of the laundry 420 in the drum 110 is shifted by 180 degrees. Therefore, it can be detected that the phase of the eccentric position 450 is shifted by 180 degrees at the start time of the first acceleration section and the second acceleration section.
- the processing portion 150 obtains the two points, in which the phase is shifted by 180 degrees, based on the rotation angle of the drum 110.
- the rotation angle of the drum 110 may be detected by the sensor 140. More particularly, the difference between the rotation angle of the two points, in which the phase is shifted by 180 degrees, corresponds to (n + 0.5) rotation (n: natural number).
- the phase detection of the start time based on the rotation angle may be performed in such a way that an angle at the start time of the first acceleration section is stored and then the second acceleration section starts at a timing in which the rotation angle is shifted by 180 degrees from the stored angle.
- phase detection of the start time based on the rotation angle is more accurately performed in the embodiment using the profile 300 (continuous driving).
- the processing portion 150 obtains the two points, in which the phase is shifted by 180 degrees, based on at least one of the rotational speed of the drum 110, a current flowing in the motor 120, and a voltage applied to the motor 120. More particularly, in the two points in which the phase is shifted by 180 degrees, a phase difference of one of the rotational speed of the drum 110, the current flowing in the motor 120, and the voltage applied to the motor 120 is 180 degrees.
- the eccentric position 450 may be obtained from the phase of the sine wave waveform indicating the variation of the rotational speed. As the uneven distribution of the laundry 420 in the drum 110 is reduced, the amplitude of the waveform is reduced and the phase detection is difficult.
- the controller may start the second acceleration section at a timing that is shifted by 180 degrees from the start time of the first acceleration section.
- the current flowing in the motor 120 and the voltage applied to the motor 120 also vary in the constant speed section. Therefore, by using any one of the current flowing in the motor 120 or the voltage applied to the motor 120, it is possible to detect the phase at the start time in the same manner.
- the current flowing in the motor 120 and the voltage applied to the motor 120 may be detected by the controller 130.
- FIG. 5 illustrates a flow chart according to an embodiment of the disclosure.
- the senor may detect the rotational speed of the drum (1001).
- the processor may control the drum by controlling the motor, and the drum may be driven in the first acceleration section (1002).
- the processor may determine the mass of laundry corresponding to the first acceleration section (1003).
- the processor may perform the second acceleration section by controlling the motor at a point shifted by 180 degrees from the phase of the laundry at the start time of the first acceleration section (1004).
- the processor may determine the mass of the laundry corresponding to the second acceleration section (1005).
- the processor may determine the final mass of the laundry based on an average of the mass of the laundry obtained in the first acceleration section and the mass of the laundry obtained in the second acceleration section (1006).
- the washing machine may more accurately measure the mass of laundry even when an imbalance of laundry occurs.
- Each of the various functions in the disclosure may be realized by a single element or may be realized by a plurality of elements. Conversely, multiple functions may be realized by a single element. Each function may be realized by hardware, software, or a combination of hardware and software.
- the flowchart in the disclosure includes a plurality of blocks. The processing of these blocks may be performed serially or in parallel. Also, the order of some blocks may be changed.
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Description
- The disclosure relates to a washing machine configured to determine a mass of laundry.
- Techniques for obtaining the mass of laundry in a washing machine are known. When the mass of laundry is obtained, washing time, quantity, etc. may be changed based on the obtained mass of the laundry. For example, Patent Document 1 discloses a technique that detects the mass of laundry based on rise time and fall time of a rotational speed of a motor.
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EP 3299504 A1 discloses a washing machine to measure mass of laundry using an inertial torque. - Therefore, it is an aspect of the disclosure to provide a washing machine capable of more accurately measuring a mass of laundry even when an imbalance of laundry occurs.
- Additional aspects of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.
- In accordance with an aspect of the disclosure, a washing machine is provided as defined in claim 1.
- In accordance with another aspect of the disclosure, a control method of a washing machine is provided as defined in a further independent claim 14.
- Further embodiments are defined in the dependent claims.
- Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation; the term "or," is inclusive, meaning and/or; the phrases "associated with" and "associated therewith," as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like; and the term "controller" means any device, system or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware or software, or some combination of at least two of the same. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. Moreover, various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in a suitable computer readable program code. The phrase "computer readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer readable medium" includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory. A "non-transitory" computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals. A non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device. Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.
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FIG. 1 is a view illustrating a structure of a washing machine according to an embodiment of the disclosure; -
FIG. 2 is a view illustrating a profile of intermittent driving of a motor for obtaining a mass of laundry according to an embodiment of the disclosure; -
FIG. 3 is a view illustrating a profile of intermittent driving of the motor for obtaining a mass of laundry according to an embodiment of the disclosure; -
FIG. 4 is a view illustrating an eccentric position due to uneven distribution of the laundry in a drum according to an embodiment of the disclosure; and -
FIG. 5 illustrates a flow chart according to an embodiment of the disclosure. -
FIGS. 1 through 5 , discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device. - In the following descriptions and drawings, corresponding parts are represented by the same reference numerals. The sizes of the elements shown in the drawings are not necessarily drawn to scale.
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FIG. 1 is a view illustrating a structure of awashing machine 100 according to an embodiment of the disclosure. Thewashing machine 100 includes adrum 110 in which laundry is accommodated, amotor 120 configured to rotate thedrum 110, acontroller 130 configured to control rotation of themotor 120, asensor 140 configured to detect a rotational speed of thedrum 110, and aprocessing portion 150. - Meanwhile, the
controller 130 and theprocessing portion 150 may be implemented with at least one processor. - According to an embodiment, the
sensor 140 detects a rotation angle of thedrum 110 in addition to the rotational speed of thedrum 110. Theprocessing portion 150 may determine the mass of the laundry based on the rotational speed in first and second acceleration sections to be described later. - In various embodiments, the rotational speed of the
drum 110 is used. Thesensor 140 is a position sensor configured to directly detect the rotational speed of thedrum 110, but is not limited thereto. Therefore, thesensor 140 may be any suitable sensor. - The
processing portion 150 may typically include at least oneprocessor 152 and amemory 154. Theprocessor 152 executes a computer program configured to process of controlling the rotation of thedrum 110 and themotor 120 and configured to process of obtaining the mass of the laundry. Thememory 154 typically stores such computer programs and associated data. Theprocessor 152 outputs a signal for controlling the rotation of themotor 120 to thecontroller 130. Thecontroller 130 drives themotor 120 based on the control signal from theprocessor 152.FIG. 1 illustrates that thecontroller 130 and theprocessing portion 150 are separate functional blocks, but may be implemented as a single functional block. -
FIG. 2 is a view illustrating aprofile 200 of intermittent driving of themotor 120 for obtaining a mass of laundry according to an embodiment of the disclosure. InFIG. 2 , a horizontal axis represents the time, and a vertical axis represents the rotational speed of thedrum 110. Theprofile 200 includes a firstconstant speed section 211, afirst acceleration section 212, astop section 215, a secondconstant speed section 221, and asecond acceleration section 222. A sign of the rotational speed indicates a rotational direction of thedrum 110. Therefore, from time 0 (zero) to thestop section 215, thedrum 110 rotates in one direction, and thereafter rotates in the opposite direction. - According to an embodiment, the
controller 130 controls the rotation of themotor 120 to allow an absolute value of the rotational speed of thedrum 110 at the start of thefirst acceleration section 212 to be the same as an absolute value of the rotational speed of thedrum 110 at the start of thesecond acceleration section 222 and to allow sings thereof to be opposite to each other. -
FIG. 3 is a view illustrating aprofile 300 of intermittent driving of themotor 120 for obtaining a mass of laundry according to an embodiment of the disclosure. InFIG. 3 , a horizontal axis represents the time, and a vertical axis represents the rotational speed of thedrum 110. Theprofile 300 includes a firstconstant speed section 311, afirst acceleration section 312, a secondconstant speed section 321, and asecond acceleration section 322. Unlike theprofile 200, theprofile 300 does not include a stop section. - According to an embodiment, the constant speed section, the acceleration section, and the deceleration section may be provided prior to the first
constant speed section 311. Accordingly, a position of the laundry in thedrum 110 may be fixed in advance. - According to an embodiment, the
controller 130 controls the rotation of themotor 120 to provide the firstconstant speed section 311, in which the rotational speed of thedrum 110 is constant, prior to thefirst acceleration section 312 and to provide the secondconstant speed section 321, in which the rotational speed of thedrum 110 is constant, prior to thesecond acceleration section 322. -
FIG. 4 is a view illustrating an eccentric position due to uneven distribution of the laundry in thedrum 110 according to an embodiment of the disclosure. Thedrum 110 rotates about arotation axis 410.Laundry 420 in thedrum 110 may have an uneven distribution as illustrated inFIG. 4 . At this time, acenter 430 of thedrum 110 is also shifted from therotation axis 410 due to the uneven distribution of thelaundry 420. When it is assumed that a line, which is along therotation axis 410 and then intersects a plane corresponding to an opening portion of thedrum 110 perpendicular to therotation axis 410, is areference line 440, an angle of thecenter 430 with respect to thereference line 440 corresponds to aneccentric position 450 caused by the uneven distribution of thelaundry 420 in thedrum 110. Theeccentric position 450 may be set in a range of 0 to 360 degrees. In the disclosure, the position of thedrum 110 is represented by theeccentric position 450, which may be named as a phase. - According to an embodiment using the profile 200 (intermittent driving) or the profile 300 (continuous driving), a start time of the first acceleration section and the second acceleration section corresponds to two points in which the
eccentric position 450 caused by the uneven distribution of thelaundry 420 in thedrum 110 is shifted by 180 degrees. In an embodiment using the profile 300 (continuous driving), as shown inFIG. 3 , theeccentric position 450 at a start time of thefirst acceleration section 312 is 270 degrees, and theeccentric position 450 at a start time of thesecond acceleration section 322 is 90 degrees. Therefore, the start time of thefirst acceleration section 312 and thesecond acceleration section 322 corresponds to the two points in which theeccentric position 450 caused by the uneven distribution of thelaundry 420 in thedrum 110 is shifted by 180 degrees. In another embodiment using the profile 200 (intermittent driving), a start time of thefirst acceleration section 212 and thesecond acceleration section 222 corresponds to two points in which theeccentric position 450 caused by the uneven distribution of thelaundry 420 in thedrum 110 is shifted by 180 degrees. - In an embodiment using the profile 200 (intermittent driving) or the profile 300 (continuous driving), the
drum 110 rotates n times (n: natural number) in the first acceleration section and the second acceleration section. For example, in an embodiment, thedrum 110 rotates once in thefirst acceleration section 312 and thesecond acceleration section 322, but it is not limited thereto. Therefore, as long as the number of rotation of thedrum 110 in thefirst acceleration section 312 is the same as the number of rotation of thedrum 110 in thesecond acceleration section 322, thedrum 110 may rotate n times (n: natural number) other than once. "The number of rotation" of the drum represents the number of times in which the drum rotates. For example, thedrum 110 may rotate two times in thefirst acceleration section 312 and thesecond acceleration section 322. - In an embodiment using the profile 200 (intermittent driving) or the profile 300 (continuous driving), the
processing portion 150 obtains the mass based on the mass detected in the first and second acceleration sections. When a torque of themotor 120 is constant, the acceleration in the first and second acceleration sections depends on the mass of thelaundry 420. - For example, when the mass of the
laundry 420 is heavy, the increase in the rotational speed of thedrum 110 is small even when thedrum 110 accelerates in the acceleration section. However, when the mass of thelaundry 420 is light, the increase in the rotational speed of thedrum 110 increases based on the acceleration of thedrum 110 in the acceleration section. Therefore, theprocessing portion 150 may obtain the mass of thelaundry 420 based on the increase amounts of the two rotational speeds in the first and second acceleration sections. - In an embodiment using the
profile 200 and theprofile 300, an angle of the rotation axis of thedrum 110 of thewashing machine 100 according to the disclosure with respect to the horizontal direction is from 0 (zero) degree to 45 degrees. In this range, it is possible to effectively obtain the mass of thelaundry 420 from two mass values based on the acceleration of thefirst acceleration section 312 and thesecond acceleration section 322. A washing machine operated in this range includes a washing machine that is commonly referred as "a drum type washing machine". In the drum type washing machine, the rotation axis of thedrum 110 is relatively close to the horizontal direction. Accordingly, due to the gravity, the rotational speed may be reduced when theeccentric position 450 moves up and the rotational speed may be increased when theeccentric position 450 moves down. Even when such a variation in the rotational speed occurs, it is possible to obtain a value closer to the true mass of thelaundry 420 based on the two mass values of thelaundry 420 obtained separately in the first acceleration section and the second acceleration section, which will be described later. - In the example of
FIG. 3 , because the start time of thefirst acceleration section 312 and thesecond acceleration section 322 corresponds to the two points in which theeccentric position 450 caused by the uneven distribution of thelaundry 420 in thedrum 110 is shifted by 180 degrees, it is possible to reduce an error that may occur when detecting the mass of thelaundry 420. This effect is also obtained in the example ofFIG. 2 . It is appropriate to determine the mass of thelaundry 420 based on an average of two masses detected in the first and second acceleration sections. Accordingly, the processing portion may more reduce the error that may occur when detecting the mass of thelaundry 420. - By the continuous driving of the
profile 300, it is possible to detect the mass two times while maintaining the arrangement of thelaundry 420 in thedrum 110 that is maintaining the eccentric position and the imbalance. - The imbalance is a parameter determined by a weight corresponding to the uneven distribution of the
laundry 420 in thedrum 110 and a distance of thelaundry 420 from therotation axis 410. As the weight and the distance are increased, the imbalance may be increased. When the rotation direction is changed as illustrated in theprofile 200, a stop section of themotor 120 is generated. In the stop section, the centrifugal force is lost, and thelaundry 420 attached to the side of thedrum 110 falls down in the vertical direction and thus the arrangement of thelaundry 420 may be changed. - At this time, the eccentric position and the unbalance amount change. The eccentric position is corrected by monitoring the phase of the rotational speed or the like, but the imbalance is not corrected. Therefore, the
profile 200 has a larger deviation than theprofile 300. - Accordingly, the
profile 300 is more appropriate than theprofile 200. - In an embodiment using the
profile 300, thefirst acceleration section 312 and thesecond acceleration section 322 are generated during continuous driving of the drum, and the rotational speed of the drum is maintained at 30 rpm or more in thefirst acceleration section 312 and thesecond acceleration section 322. - "Rpm" may mean revolutions per minute of the motor and the drum.
- Accordingly, the movement of the
laundry 420 in thedrum 110 may be reduced between thefirst acceleration section 312 and thesecond acceleration section 322. - As a result, the error at the detection of the mass of the
laundry 420 may be reduced. - As mentioned above, the start time of the first acceleration section (for example 312) and the second acceleration section (for example 322) corresponds to the two points in which the
eccentric position 450 caused by the uneven distribution of thelaundry 420 in thedrum 110 is shifted by 180 degrees. Therefore, it can be detected that the phase of theeccentric position 450 is shifted by 180 degrees at the start time of the first acceleration section and the second acceleration section. - According to an embodiment, the
processing portion 150 obtains the two points, in which the phase is shifted by 180 degrees, based on the rotation angle of thedrum 110. - The rotation angle of the
drum 110 may be detected by thesensor 140. More particularly, the difference between the rotation angle of the two points, in which the phase is shifted by 180 degrees, corresponds to (n + 0.5) rotation (n: natural number). - The phase detection of the start time based on the rotation angle may be performed in such a way that an angle at the start time of the first acceleration section is stored and then the second acceleration section starts at a timing in which the rotation angle is shifted by 180 degrees from the stored angle.
- The phase detection of the start time based on the rotation angle is more accurately performed in the embodiment using the profile 300 (continuous driving).
- According to an embodiment, the
processing portion 150 obtains the two points, in which the phase is shifted by 180 degrees, based on at least one of the rotational speed of thedrum 110, a current flowing in themotor 120, and a voltage applied to themotor 120. More particularly, in the two points in which the phase is shifted by 180 degrees, a phase difference of one of the rotational speed of thedrum 110, the current flowing in themotor 120, and the voltage applied to themotor 120 is 180 degrees. - Due to the influence of the
eccentric position 450 caused by the uneven distribution of thelaundry 420 in thedrum 110, the rotational speed of the drum is changed even in the constant speed section. - When the variation of the rotational speed is plotted with respect to the time axis, a sine wave shape may be generated. There is a correlation between the phase of the waveform and the
eccentric position 450. Therefore, theeccentric position 450 may be obtained from the phase of the sine wave waveform indicating the variation of the rotational speed. As the uneven distribution of thelaundry 420 in thedrum 110 is reduced, the amplitude of the waveform is reduced and the phase detection is difficult. - However, when the uneven distribution is small, the uneven distribution has little effect on the mass detection. Therefore, even when the phase is not detected, there is little effect on the difference (i.e., deviation) of the mass detected in the two acceleration sections. By detecting the phase of the variation waveform of the rotational speed, the controller may start the second acceleration section at a timing that is shifted by 180 degrees from the start time of the first acceleration section.
- In the same manner as the above mentioned variation of the rotational speed of the drum, the current flowing in the
motor 120 and the voltage applied to themotor 120 also vary in the constant speed section. Therefore, by using any one of the current flowing in themotor 120 or the voltage applied to themotor 120, it is possible to detect the phase at the start time in the same manner. For example, the current flowing in themotor 120 and the voltage applied to themotor 120 may be detected by thecontroller 130. - As mentioned above, it is possible to obtain the mass of the
laundry 420 based on the acceleration of the first and second acceleration sections. In an embodiment using the profile 200 (intermittent driving) and the profile 300 (continuous driving), it is appropriate that the rotational speed of thedrum 110 at an end time of the first and second acceleration sections is 300 rpm or less in terms of the load of themotor 120. In this range, it is possible to effectively obtain the mass of thelaundry 420 based on the acceleration of the first and second acceleration sections.FIG. 5 illustrates a flow chart according to an embodiment of the disclosure. - Referring to
FIG. 5 , the sensor may detect the rotational speed of the drum (1001). - Meanwhile, the processor may control the drum by controlling the motor, and the drum may be driven in the first acceleration section (1002).
- The processor may determine the mass of laundry corresponding to the first acceleration section (1003).
- The processor may perform the second acceleration section by controlling the motor at a point shifted by 180 degrees from the phase of the laundry at the start time of the first acceleration section (1004).
- The processor may determine the mass of the laundry corresponding to the second acceleration section (1005).
- The processor may determine the final mass of the laundry based on an average of the mass of the laundry obtained in the first acceleration section and the mass of the laundry obtained in the second acceleration section (1006).
- As is apparent from the above description, the washing machine may more accurately measure the mass of laundry even when an imbalance of laundry occurs.
- Each of the various functions in the disclosure may be realized by a single element or may be realized by a plurality of elements. Conversely, multiple functions may be realized by a single element. Each function may be realized by hardware, software, or a combination of hardware and software. The flowchart in the disclosure includes a plurality of blocks. The processing of these blocks may be performed serially or in parallel. Also, the order of some blocks may be changed.
Claims (15)
- A washing machine (100) comprising:a drum (110) in which laundry (420) is accommodated;a motor (120) configured to rotate the drum (110);a speed sensor (140) configured to detect a rotational speed of the drum (110); anda processor (152) configured to:identify a mass of the laundry (420) corresponding to each of a first acceleration section (212, 312) and a second acceleration section (222, 322) based on the rotational speed detected by the speed sensor (140), andcontrol the motor (120) such that an absolute value of the rotational speed at a start time of the first acceleration section (212, 312) is substantially the same as an absolute value of the rotational speed at a start time of the second acceleration section (222, 322),wherein a rotational direction of the drum (110) corresponding to the rotational speed at the start time of the first acceleration section (212, 312) is opposite to a rotational direction of the drum (110) corresponding to the rotational speed at the start time of the second acceleration section (222, 322).
- The washing machine (100) of claim 1, wherein:before the start time of the first acceleration section (212, 312), the processor (152) is further configured to control the motor (120) to drive at substantially the same rotational speed in a first constant speed section (211, 311), andbefore the start time of the second acceleration section (222, 322), the processor (152) is further configured to control the motor (120) to drive at substantially the same rotational speed in the first constant speed section (211,311).
- The washing machine (100) of claim 1, wherein a position of the laundry (420) at the start time of the first acceleration section (212, 312) is different by 180 degrees with respect to a center (430) of the drum (110) from a position of the laundry (420) at the start time of the second acceleration section (222, 322).
- The washing machine (100) of claim 3, wherein the processor (152) is further configured to control the drum (110) to rotate an integer number of times in the first and second acceleration sections (222, 322).
- The washing machine (100) of claim 4, wherein the processor (152) is further configured to identify the mass of the laundry (420) based on the mass detected in each of the first acceleration section (212, 312) and the second acceleration section (222, 322).
- The washing machine (100) of claim 5, wherein the processor (152) is further configured to identify the mass of the laundry (420) based on an average of the mass detected in the first acceleration section (212, 312) and the second acceleration section (222, 322).
- The washing machine (100) of claim 1, wherein the processor (152) is further configured to identify the start time of the first acceleration section (212, 312) and the start time of the second acceleration section (222, 322) based on a rotation angle of the drum (110).
- The washing machine (100) of claim 7, wherein, based on a half of a rotation of the motor (120), the processor (152) is further configured to identify a difference between the rotation angle at the start time of the first acceleration section (212, 312) and the rotation angle at the start time of the second acceleration section (222, 322).
- The washing machine (100) of claim 1, wherein the processor (152) is further configured to identify the start time of the first acceleration section (212, 312) and the start time of the second acceleration section (222, 322) based on at least one of the rotational speed, a current flowing in the motor (120), or a voltage applied to the motor (120).
- The washing machine (100) of claim 9, wherein a phase difference of one of the rotational speed of the motor (120), the current flowing in the motor (120), or the voltage applied to the motor (120) corresponding to the start time of the first acceleration section (212, 312) and the start time of the second acceleration section (222, 322) is 180 degrees.
- The washing machine (100) of claim 1, wherein, in a continuous driving of the drum (110), the processor (152) is further configured to:perform the first acceleration section (212, 312) and the second acceleration section (222, 322); andcontrol the rotational speed of the motor to be substantially 30 revolutions per minute (rpm) or more in the first acceleration section (212, 312) and the second acceleration section (222, 322).
- The washing machine (100) of claim 1, wherein the processor (152) is further configured to control the rotational speed of the motor to be substantially 300 rpm or less at an end time of the first and second acceleration sections (222, 322).
- The washing machine (100) of claim 1, wherein an angle of a rotation axis (410) of the drum (110) with respect to a horizontal direction is from 0 (zero) degree to 45 degrees.
- A control method of a washing machine (100) comprising:detecting a rotational speed of a drum (110) in which laundry (420) is accommodated;identifying a mass of the laundry (420) corresponding to each of a first acceleration section (212, 312) and a second acceleration section (222, 322) based on the detected rotational speed; androtating the drum (110) such that an absolute value of the rotational speed at a start time of the first acceleration section (212, 312) is substantially the same as an absolute value of the rotational speed at a start time of the second acceleration section (222, 322),wherein a rotational direction of the drum (110) corresponding to the rotational speed at the start time of the first acceleration section (212, 312) is opposite to a rotational direction of the drum (110) corresponding to the rotational speed at the start time of the second acceleration section (222, 322).
- The control method of claim 14, wherein the rotating further comprises:rotating the drum (110) at substantially the same rotational speed in a first constant speed section (211, 311) before the start time of the first acceleration section (212, 312); androtating the drum (110) at substantially the same rotational speed in the first constant speed section (211, 311) before the start time of the second acceleration section (222, 322).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2019061480A JP7426197B2 (en) | 2019-03-27 | 2019-03-27 | washing machine |
PCT/KR2020/004033 WO2020197252A1 (en) | 2019-03-27 | 2020-03-25 | Washing machine and control method thereof |
Publications (3)
Publication Number | Publication Date |
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EP3887589A1 EP3887589A1 (en) | 2021-10-06 |
EP3887589A4 EP3887589A4 (en) | 2022-01-26 |
EP3887589B1 true EP3887589B1 (en) | 2023-06-28 |
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EP20776565.2A Active EP3887589B1 (en) | 2019-03-27 | 2020-03-25 | Washing machine and control method thereof |
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EP (1) | EP3887589B1 (en) |
JP (1) | JP7426197B2 (en) |
KR (1) | KR20200115124A (en) |
WO (1) | WO2020197252A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2650844B1 (en) * | 1989-07-28 | 1991-10-11 | Ciapem | WASHING MACHINE OR DRYER IN WHICH THE LOAD OF LAUNDRY IS DETERMINED AUTOMATICALLY |
JP2614562B2 (en) * | 1991-10-30 | 1997-05-28 | 三洋電機株式会社 | Drum type washing machine |
KR100211559B1 (en) * | 1997-05-16 | 1999-08-02 | 구자홍 | Control method of balance in dehydration course of drum type washing method |
JP5042808B2 (en) * | 2007-12-27 | 2012-10-03 | 三星電子株式会社 | Drum washing machine |
KR100988625B1 (en) * | 2008-05-26 | 2010-10-18 | 엘지전자 주식회사 | Washing machine and method for controlling washing machine |
KR101711827B1 (en) * | 2010-04-26 | 2017-03-03 | 엘지전자 주식회사 | Washing machine and method for controlling thereof |
KR101505189B1 (en) * | 2012-10-09 | 2015-03-20 | 엘지전자 주식회사 | Laundry treatment machine and the method for operating the same |
KR102557391B1 (en) * | 2016-08-08 | 2023-07-19 | 삼성전자주식회사 | Washing machine and control method thereof |
KR102577545B1 (en) * | 2016-09-27 | 2023-09-11 | 엘지전자 주식회사 | Washing machine and method for controlling washing machine |
CN108691149A (en) * | 2017-04-10 | 2018-10-23 | 台达电子工业股份有限公司 | The DC Brushless Motor load measurement method and its device of sensing device |
-
2019
- 2019-03-27 JP JP2019061480A patent/JP7426197B2/en active Active
-
2020
- 2020-03-02 KR KR1020200026081A patent/KR20200115124A/en unknown
- 2020-03-25 EP EP20776565.2A patent/EP3887589B1/en active Active
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EP3887589A4 (en) | 2022-01-26 |
EP3887589A1 (en) | 2021-10-06 |
JP7426197B2 (en) | 2024-02-01 |
KR20200115124A (en) | 2020-10-07 |
WO2020197252A1 (en) | 2020-10-01 |
JP2020156905A (en) | 2020-10-01 |
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