EP2470710B1 - Procédé de commande d'un lave-linge - Google Patents

Procédé de commande d'un lave-linge Download PDF

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Publication number
EP2470710B1
EP2470710B1 EP10812334.0A EP10812334A EP2470710B1 EP 2470710 B1 EP2470710 B1 EP 2470710B1 EP 10812334 A EP10812334 A EP 10812334A EP 2470710 B1 EP2470710 B1 EP 2470710B1
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EP
European Patent Office
Prior art keywords
drum
laundry
rpm
accelerating
tub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10812334.0A
Other languages
German (de)
English (en)
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EP2470710A4 (fr
EP2470710A1 (fr
Inventor
Jae Hyuk Jang
Bon Kwon Koo
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LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020090080120A external-priority patent/KR101940529B1/ko
Priority claimed from KR1020090079923A external-priority patent/KR20110022367A/ko
Priority claimed from KR1020090079912A external-priority patent/KR101741549B1/ko
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP2470710A1 publication Critical patent/EP2470710A1/fr
Publication of EP2470710A4 publication Critical patent/EP2470710A4/fr
Application granted granted Critical
Publication of EP2470710B1 publication Critical patent/EP2470710B1/fr
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Classifications

    • 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
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis
    • D06F37/225—Damping vibrations by displacing, supplying or ejecting a material, e.g. liquid, into or from counterbalancing pockets
    • 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
    • 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
    • D06F2103/26—Imbalance; Noise level
    • 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
    • D06F2105/52—Changing sequence of operational steps; Carrying out additional operational steps; Modifying operational steps, e.g. by extending duration of steps
    • 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 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/40—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of centrifugal separation of water from the laundry

Definitions

  • the present invention relates to a control method of a laundry machine.
  • EP 2083109 A1 describes a drum type washing machine having ball balancers, comprising a controller to detect the eccentricity amount of the rotary tub while controlling the rotary tub to be rotated at a first rotation speed of, for example, approximately 100 rpm.
  • the rotary tub is accelerated to a second rotation speed that is a limit value less than a resonance range rotation speed of the rotary tub and is, for example, around 180 rpm.
  • the rotary tub is decelerated to a third rotation speed and a drainage process is carried out.
  • the controller estimates the positions of the ball balancers, and decides a point of time for spin-drying acceleration using the estimated positions of the ball balancers.
  • EP 1950336 A1 describes a washing machine and a control method thereof capable of rein creasing a number of rotations of a motor after maintaining the number of rotations at a predetermined number before excessive vibration of a water tub, braking the motor when the water tub is vibrated at more than a predetermined vibration level, and reincreasing the number of rotations, thereby reducing the excessive vibration of the water tub.
  • a laundry machine may include washing, rinsing and spinning cycles.
  • the spinning cycle includes a rotating step of rotating a drum provided in such a laundry machine at the highest RPM. Because of the step, the spinning cycle would generate noise and vibration quite a lot, which is required to be solved in the art the prevent invention pertains to.
  • the present invention is directed to a control method of a laundry machine.
  • An object of the present invention is to provide a control method of a laundry machine which can solve the above problem.
  • the laundry machine may comprise a driving unit comprising a shaft connected to a drum, a bearing housing to rotatably support the shaft, and a motor to rotate the shaft, and a suspension assembly is connected to the driving unit.
  • a driving unit comprising a shaft connected to a drum, a bearing housing to rotatably support the shaft, and a motor to rotate the shaft, and a suspension assembly is connected to the driving unit.
  • the laundry machine may comprise a rear gasket for sealing to prevent washing water from leaking from a space between a driving unit and a tub, and enabling the driving unit movable relative to the tub.
  • a tub is supported rigidly more than a drum being supported by a suspension assembly.
  • an object of the present invention is to provide a control method of a laundry machine provided with a balancer includes a balancing step of at least one time for rotating a drum at a constant speed for a predetermined time by decelerating the drum if the drum is accelerated at a predetermined RPM or more, the balancing step performed after a rotation speed of the drum passes through a transient region of the laundry machine.
  • noise of the laundry machine can be reduced remarkably when the spinning cycle is carried out.
  • a laundry machine 100 includes a cabinet 10 configured to define an exterior appearance thereof, a tub 20 mounted in the cabinet 10 to hold wash water therein and a drum 30 rotatably provided in the tub 20.
  • the cabinet 10 defines the exterior appearance of the laundry machine 100 and configuration elements which will be described later maybe mounted in the cabinet 10.
  • a door 11 is coupled to a front of the cabinet 10 and a user may open the door 11 to load laundry items including clothes, beddings, cloth items and the like (hereinafter, 'laundry') into the cabinet 10.
  • the tub 20 configured to hold wash water therein may be provided in the cabinet 10 and the drum configured to receive the laundry therein may be rotatale within the tub 20.
  • a plurality of lifters 31 may be provided in the drum 30 to lift and drop the laundry during the rotation of the drum 30.
  • the tub 20 may be supported by a spring 50 provided above the tub 20.
  • a motor 40 is mounted to a rear surface of the tub 20 to rotate the drum 30. That is, the motor 40 is provided in a rear wall of the tub 20 and it rotates the drum 30.
  • the tub 20 provided in the laundry machine according to this example may be vibrated in communication with the drum 30.
  • the vibration generated in the drum 30 and the tub 20 may be absorbed by a damper 60 provided below the tub 20.
  • the tub 20 and the drum 30 may be provided in parallel to a base of the cabinet 10 or tilted downward although not shown in the drawing. As the user loads the laundry into the drum 30, it is advantageous that the front portions of the tub 20 and the drum 30 should be tilted upward.
  • a balancer 70 is provided in a front surface and/or rear surface to balance the drum and the balancer 70 will be described in detail later.
  • the tub may be fixedly supported to the cabinet or it may be supplied to the cabinet by a flexible supporting structure such as a suspension unit which will be described later. Also, the supporting of the tub may be between the supporting of the suspension unit and the completely fixed supporting.
  • the tub may be flexibly supported by the suspension unit which will be described later or it may be complete-fixedly supported to be movable more rigidly.
  • the cabinet may not be provided unlike embodiments which will be described later.
  • a predetermined space in which the built-in type laundry machine will be installed may be formed by a wall structure and the like, instead of the cabinet.
  • the built-in type laundry machine may not include a cabinet configured to define an exterior appearance thereof independently.
  • a tub 12 provided in the laundry machine is fixedly supported to a cabinet.
  • the tub 12 includes a tub front 100 configured to define a front part of the tub and a tub rear 120 configured to define a rear part of the tub.
  • the tub front 100 and the tub rear 120 are assembled to each other by screws, to form a predetermined space big enough to accommodate the drum.
  • the tub rear 120 has an opening formed in a rear portion thereof and an inner circumference of the rear portion composing the tub rear 120 is connected with an outer circumference of a rear gasket 250.
  • the tub back 130 has a through-hole formed in a center thereof to pass a shaft to pass there through.
  • the rear gasket 250 is made of a flexible material not to transmit the vibration of the tub back 130 to the tub rear 120.
  • the tub rear 120 has a rear surface 128 and the rear surface 128, the tub back 130 and the rear gasket 250 may define a rear wall of the tub.
  • the rear gasket 250 is connectedly sealed with the tub back 130 and the tub rear 120, such that the wash water held in the tub may not leak.
  • the tub back 130 is vibrated together with the drum during the rotation of the drum. At this time, the tub back 130 is distant from the tub rear 120 enough not to interfere with the tub rear. Since the rear gasket 250 is made of the flexible material, the tub back 130 is allowed to relative-move, without interference of the tub rear 120.
  • the rear gasket 250 may include a corrugated portion 252 extendible to a predetermined length to allow the relative-motion of the tub back 130.
  • a foreign substance preventing member 200 configured to prevent foreign substances from drawn between the tub and the drum may be connected to a front portion of the tub front 100.
  • the foreign substance preventing member 200 is made of a flexible material and it is fixed to the tub front 100.
  • the foreign substance preventing member 200 may be made of the flexible material identical to the material composing the rear gasket 250.
  • the foreign substance preventing member 200 will be referenced to as 'front gasket'.
  • the drum 32 includes a drum front 300, a drum center and a drum back 340. Balancers 310 and 330 may be installed in front and rear parts of the drum, respectively.
  • the drum back 340 is connected with a spider 350 and the spider 350 is connected with the shaft 351.
  • the drum 32 is rotated in the tub 12 by a torque transmitted via the shaft 351.
  • the shaft 351 is directly connected with a motor 170, passing through the tub back 130.
  • a rotor 174 composing the motor 170 is directly connected with the shaft 351.
  • a bearing housing 400 is secured to a rear portion of the tub back 130 and the bearing housing 400 rotatably supports the shaft, located between the motor 170 and the tub back 130.
  • a stator 172 composing the motor 170 is secured to the bearing housing 400 and the rotor 174 is located surrounding the stator 172. As mentioned above, the rotor 174 is directly connected with the shaft 351.
  • the motor 170 is an outer rotor type motor and it is directly connected with the shaft 351.
  • the bearing housing 400 is supported via a suspension unit with respect to a cabinet base 600.
  • the suspension unit 180 includes three perpendicular supporters and two oblique supporters configured to support the bearing housing 400 obliquely with respect to a forward and rearward direction.
  • the suspension unit 180 may includes a first cylinder spring 520, a second cylinder spring 510, a third cylinder spring 500, a first cylinder damper 540 and a second cylinder damper 530.
  • the first cylinder spring 520 is connected between a first suspension bracket 450 and the cabinet base 600.
  • the second cylinder spring 510 is connected between a suspension bracket 440 and the cabinet base 600.
  • the third cylinder spring 500 is directly connected between the bearing housing 400 and the cabinet base 600.
  • the first cylinder damper 540 is inclinedly installed between the first suspension bracket 450 and a rear portion of the cabinet base.
  • the second cylinder damper 530 is inclinedly installed between the second suspension bracket 440 and a rear portion of the cabinet base 600.
  • the cylinder springs 520, 510 and 500 of the suspension unit 180 may be elastically connected to the cabinet base 600 enough to allow a forward/rearward and rightward/ leftward movement of the drum, not connected to the cabinet base 600 fixedly. That is, they are elastically supported by the base 600 to allow the drum to be rotated to a predetermined angle in forward/rearward and rightward/leftward directions with respect to the connected portion.
  • the perpendicular ones of the suspension unit may be configured to suspend the vibration of the drum elastically and the oblique ones may be configured to dampen the vibration. That is, in a vibration system including a spring and damping means, the perpendicular ones are employed as spring and the oblique ones are employed as damping means.
  • the tub front 100 and the tub rear 120 are fixedly secured to the cabinet 110 and the vibration of the drum 32 is suspendedly supported by the suspension unit 180.
  • the supporting structure of the tub 12 and the drum 32 may be called'separated'substantially, such that the tub 12 may not be vibrated even when the drum 32 is vibrated.
  • the bearing housing 400 and the suspension brackets may be connected with each other by first and second weights 431 and 430.
  • the laundry machine may include balancer 70, 310 and 330 to prevent the noise and vibration generated by the unbalanced rotation of the drum 30 and 32.
  • the balancer 70, 310 and 330 may be provided in a front or rear portion, or in both of the portions of the drum 30 and 32.
  • the balancer 70, 310 and 330 is mounted to the drum 30 and 32 to reduce the unbalance. Because of that, the balancer 70, 310 and 330 may have a movable gravity center.
  • the balancers are mounted to the drum 30 and 32 to reduce the unbalance. Because of that, the balancer may have a movable gravity center.
  • the balancer may include movable bodies having a predetermined weight located therein and a passage the movable bodies move along.
  • the balancers may be ball balancers
  • the balancer 70, 310 and 330 may include balls 72, 312 and 332 having a predetermined weight located therein and a passage the ball moves along. That is, the balancer 70, 310 and 330 includes balls 72, 312 and 332 having a predetermined weight located therein and a passage the ball moves along.
  • the balls are rotated by the friction generated during the rotation of the drum 30 and 32 and they are not kept unmovable in the drum when the drum is rotated. Because of that, the balls are rotated at a different speed from the rotation speed of the drum.
  • the laundry which generates the unbalance may be rotated at the almost same speed as the speed of the drum because of the friction generated by the close contact with an inner circumferential surface of the drum and the lifters provided in the inner circumferential surface.
  • the rotation speed of the laundry is different from that of the balls.
  • the rotation speed of the laundry is higher than that of the balls during an initial rotation stage in which the drum is rotated at a relatively low speed, specifically, a rotation angle speed of the laundry is higher.
  • a phase difference between the balls and the laundry which is a phase difference with respect to a rotation center of the drum, may changes continuously.
  • the balls when the rotation speed of the drum is getting higher, the balls may be in close contact with an outer circumferential surface of the passage by the centrifugal force. At the same time, the balls are aligned at a predetermined position having approximately 90° to 180° of the phase difference with respect to the laundry. If the rotation speed of the drum is a predetermined value or more, the centrifugal force is getting larger and the friction generated between the outer circumferential surface and the balls is a predetermined value or more and the balls may be rotated at the same speed as the drum. at this time, the balls are rotated at the same speed as the drum, with maintaining the position having the 90° to 180°, preferably, approximately 180° of the phase difference with respect to the laundry.
  • the rotation of the balls at the predetermined positions as mentioned above may be expressed as'unbalance corresponding position' or 'balancing'.
  • the ball located in the balancer 70, 310 and 330 may move to an unbalance corresponding position to reduce the unbalance.
  • the laundry machine generally includes a washing cycle, a rinsing cycle, and a spinning cycle.
  • the spinning cycle will mainly be described with reference to the accompanying drawings.
  • FIG. 4 is a graph illustrating variation in RPM of the drum based on the passage of time in the control method of the spinning cycle according to an example.
  • a horizontal axis represents time
  • a vertical axis represents variation of the rotation speed of the drum 30, 32, i.e., revolutions per minute (RPM).
  • RPM revolutions per minute
  • the control method of the spinning cycle according to the present invention includes a laundry distributing step S100 and a spinning step S200.
  • the laundry distributing step S100 serves to rotate the drum at a relatively low speed and uniformly distribute the laundry inside the drum.
  • the spinning step S200 serves to remove water of the laundry by rotating the drum at a relatively high speed.
  • the laundry distributing step and the spinning step are classified based on their main functions and are not limited to their main functions. For example, even in the laundry distributing step, water may be removed from the laundry by rotation of the drum.
  • the laundry distributing step S100 includes a wet laundry sensing step S110, a laundry disentangling step S130, and an eccentricity sensing step S150.
  • the spinning step S200 includes a transient region passing step S210 and an accelerating step S230.
  • the laundry inside the drum 30, 32 is wetted by water.
  • the control part initially senses the amount of laundry inside the drum 30, 32, i.e., the amount of wet laundry if the spinning cycle starts (S110).
  • control part senses the amount of wet laundry is that weight of laundry containing water is different from that of dry laundry even though the control part initially senses the amount of laundry, which is not wet, i.e., the amount of dry laundry.
  • the sensed amount of wet laundry may be used as a factor that determines an allowable condition for accelerating the drum 30, 32 at the transient region passing step S210, which will be described later, or determines to again carry out the laundry distributing step by decelerating the drum 30, 32 through an eccentricity condition at the transient region passing step S210.
  • the amount of wet laundry inside the drum 30, 32 is sensed when the drum 30, 32 is rotated at a constant speed for a predetermined time and then decelerated after being accelerated at a first rotation speed RPM 1, for example, 100RPM to 110RPM.
  • RPM 1 for example, 100RPM to 110RPM.
  • braking power is used.
  • the amount of wet laundry is sensed using a rotation rate for an acceleration period when driving motors 40 and 170 rotating the drum 30, 32 are accelerated, a rotation rate for a deceleration period when the driving motors 40 and 170 are decelerated, a DC power of the applied motor, etc.
  • control part After sensing the amount of wet laundry, the control part carries out the laundry disentangling step to distribute the laundry inside the drum 30, 32 (S130).
  • the laundry disentangling step is to uniformly distribute the laundry inside the drum 30, 32, thereby preventing an eccentricity rate of the drum 30, 32 from being increased by concentration of the laundry on a specific region inside the drum 30, 32. This is because that noise and vibration may be increased when RPM of the drum 32 is increased if the eccentricity rate is increased.
  • the laundry disentangling step is carried out until the drum 32 is accelerated in one direction with a predetermined inclination to reach the rotation speed of the eccentricity sensing step, which will be described later.
  • control part senses eccentricity of the drum (S150).
  • the control part determines whether to accelerate the drum by sensing the eccentricity rate of the drum.
  • Eccentricity sensing is carried out using the difference in acceleration when the drum is rotated. Namely, when the drum is rotated, the difference in acceleration between the case where the drum is rotated downwardly along gravity and the case where the drum is rotated upwardly contrary to gravity occurs depending on an eccentricity level.
  • the control part measures this difference in acceleration by using a speed sensor such as a hole sensor provided in the driving motors 40 and 170, thereby sensing the eccentricity rate. Accordingly, if the eccentricity rate is sensed, the laundry inside the drum sticks to an inner wall of the drum without dropping even though the drum is rotated. In this case, the drum is rotated in the range of 100 RPM to 110 RPM, approximately.
  • the control part can store data having a reference eccentricity rate previously determined to allow acceleration depending on the amount of wet laundry, in the form of table. As a result, the control part can determine whether to accelerate the drum by applying the sensed amount of wet laundry and the sensed eccentricity rate to the table. In other words, if the eccentricity rate depending on the sensed amount of wet laundry is more than the reference eccentricity rate, the eccentricity rate is too great, whereby the drum cannot be accelerated. Accordingly, the wet laundry sensing step, the laundry disentangling step, and the eccentricity sensing step, as described above, are repeated.
  • the wet laundry sensing step, the laundry disentangling step, and the eccentricity sensing step can be repeated until the sensed eccentricity rate satisfies a value of the reference eccentricity rate or less.
  • the control part stops rotation of the drum and reports to the user that the spinning cycle has not ended normally if the drum is not accelerated for a predetermined time, for example, 20minutes to 30minutes, after the spinning cycle starts.
  • the eccentricity rate depending on the sensed amount of wet laundry is the reference eccentricity rate or less, it satisfies the condition for allowing acceleration. Accordingly, the transient region passing step S210 is carried out.
  • the transient region can be defined as a predetermined RPM band that includes one or more resonant frequencies.
  • resonance occurs depending on the system of the laundry machine. If the system of the laundry machine is determined, the transient region has natural vibration characteristics generated depending on the determined system of the laundry machine.
  • the transient region is varied depending on the system of the laundry machine, and, for example, is in the range of 200rpm to 270rpm in the laundry machine according to the example and in the range of 200rpm to 350rpm in the laundry machine according to the embodiment.
  • Fig. 6 illustrates a graph showing a relation of mass vs. a natural frequency. It is assumed that, in vibration systems of two laundry machines, the two laundry machines have mass of m0 and ml respectively and maximum holding laundry amounts are ⁇ m, respectively. Then, the transition regions of the two laundry machines can be determined taking ⁇ nf0 and ⁇ nf1 into account, respectively. In this instance, amounts of water contained in the laundry will not be taken into account, for the time being.
  • the laundry machine with smaller mass m1 has a range of the transition region greater than the laundry machine with greater mass m0. That is, the range of the transition region having variation of the laundry amount taken into account becomes the greater as the mass of the vibration system becomes the smaller.
  • the related art laundry machine has a structure in which vibration is transmitted from the drum to the tub as it is, causing the tub to vibrate. Therefore, in taking the vibration of the related art laundry machine into account, the tub is indispensible.
  • the tub has, not only a weight of its own, but also substantial weights at a front, a rear or a circumferential surface thereof for balancing. Accordingly, the related art laundry machine has great mass of the vibration system.
  • the tub since the tub, not only has no weight, but also is separated from the drum in view of a supporting structure, the tub may not be put into account in consideration of the vibration of the drum. Therefore, the laundry machine of the embodiment may have relatively small mass of the vibration system.
  • the related art laundry machine has mass m0 and the laundry machine of the embodiment has mass m1, leading the laundry machine of the embodiment to have a greater transition region, at the end.
  • a start RPM of the transient region of the laundry machine according to this embodiment may be similar to a start RPM of the transient region of the conventional laundry machine.
  • An end RPM of the transient region of the laundry machine according to this embodiment may increase more than a RPM calculated by adding a value of approximately 30% of the start RPM to the start RPM.
  • the transient region finishes at an RPM calculated by adding a value of approximately 80% of the start RPM to the start RPM.
  • the transient region may include a RPM band of approximately 200 to 350 rpm.
  • a balancer In a case, a balancer is used, a method may be put into account, in which the rotation speed of the drum passes through the transition region while movable bodies provided in the balancer are positioned on an opposite side of an unbalance of the laundry. In this instance, it is preferable that the movable bodies are positioned at exact opposite of the unbalance in middle of the transition region.
  • the transient region of the laundry machine according to this embodiment is relatively wide in comparison to that of the conventional laundry machine. Because of that, even if the laundry even-spreading step or ball balancing is implemented in a RPM band lower than the transient region, the laundry might be in disorder or balancing might be failed with the drum speed passing the transient region.
  • balancing may be implemented at least one time in the laundry machine according to this embodiment before and while the drum speed passing the transient region.
  • the balancing may be defined as rotation of the drum at a constant-speed for a predetermined time period.
  • Such the balancing allows the movable body of the balancer to the opposite positions of the laundry, only to reduce the unbalance amount. By extension, the effect of the laundry even-spreading.
  • the balancing is implemented while the drum speed passing the transient region and the noise and vibration generated by the expansion of the transient region may be prevented.
  • the balancing when the balancing is implemented before the drum speed passing the transient region, the balancing may be implemented in a different RPM band from the RPM of the conventional laundry machine. For example, if the transient region starts at 200 RPM, the balancing is implemented in the RPM band lower than approximately 150 RPM. Since the conventional laundry machine has a relatively less wide transient region, it is not so difficult for the drum speed to pass the transient region even with the balancing implemented at the RPM lower than approximately 150 RPM. However, the laundry machine according to this embodiment has the relatively wide expanded transient region as described above.
  • the laundry machine may increase the balancing RPM in comparison to the conventional balancing RPM, when the balancing is implemented before the drum speed enters the transient region. That is, if the start RPM of the transient region is determined, the balancing is implemented in a RPM band higher than a RPM calculated by subtracting a value of approximately 25% of the start RPM from the start RPM. For example, the start RPM of the transient region is approximately 200 RPM, the balancing may be implemented in a RPM band higher than 150RPm lower than 200 RPM.
  • the unbalance amount may be measured during the balancing. That is, the control method may further include a step to measure the unbalance amount during the balancing and to compare the measured unbalance amount with an allowable unbalance amount allowing the acceleration of the drum speed. If the measured unbalance amount is less than the allowable unbalance amount, the drum speed is accelerated after the balancing to be out of the transient region. In contrast, if the measured unbalance amount is the allowable unbalance amount or more, the laundry even-spreading step may be re-implemented. in this case, the allowable unbalance amount may be different from an allowable unbalance amount allowing the initial accelerating.
  • the eccentricity rate of the drum 30, 32 may be increased either as the drum 30, 32 is accelerated while the rotation speed of the drum is passing through the transient region, or by unexpected impact, which is externally caused. If the eccentricity rate of the drum 30, 32 becomes greater than a predetermined value, noise is increased remarkably, whereby it is difficult to accelerate the drum continuously. Accordingly, when the rotation speed of the drum passes through the transient region, the control part needs to continuously sense the eccentricity rate of the drum 30, 32.
  • a vibration sensor may be provided in the drum of the laundry machine, so that the control part may sense vibration of the drum when the rotation speed of the drum passes through the transient region.
  • the control part may sense vibration of the drum when the rotation speed of the drum passes through the transient region.
  • control part carries out the accelerating step S230.
  • the accelerating step S230 includes a first accelerating step S236 for accelerating the drum 30, 32 to reach a first target RPM, a balancing step S237 for carrying out balancing by decelerating the drum to reach a predetermined RPM, and a second accelerating step S238 for accelerating the drum 30, 32 to reach a second target RPM.
  • the control part removes water by increasing the rotation speed of the drum 30, 32 to reach the first target RPM (S236).
  • the first target RPM is set equally to the second target RPM of the second accelerating step but its duration is set to be shorter than that of the second target RPM.
  • the drum is accelerated at a relatively high speed to reach a desired RPM, whereby water is removed from the laundry. If the drum is accelerated, water is removed from the laundry by a centrifugal force.
  • a water discharge level is varied depending on kinds of the laundry. In other words, water is easily removed from soft clothes such as knit, whereas water is not easily removed from clothes such as jean. Accordingly, as a water discharge level is varied depending on the laundry, variation in eccentricity occurs. In particular, since water is almost removed from clothes such as knit at the first accelerating step, variation in eccentricity becomes greater than that of the second accelerating step, which will be described later.
  • the balls of the balancer are moved more actively at a lower speed than a higher speed, especially are moved at a constant speed more actively than at acceleration. Accordingly, as the drum is accelerated at a relatively high speed at the accelerating step, if there is any change in eccentricity due to water discharge, the balls of the balancer fail to actively move to the eccentricity corresponding position. For this reason, the drum 30, 32 is rotated at a high speed in a state that the balls of the balancer are not moved to the eccentricity corresponding position, whereby noise due to eccentricity is increased remarkably. As a result, since variation in eccentricity due to water discharge is not compensated appropriately at the first accelerating step, noise may be increased.
  • the first target RPM duration at the first accelerating step is shorter than the second target RPM duration at the second accelerating step.
  • the drum is decelerated directly after reaching the first target RPM, whereby the balancing step S237 can be carried out.
  • the first target RPM and/or its duration are determined as follows,
  • the first target RPM and/or its duration at the first accelerating step can be set to reach a noise reference level which is previously set at the second accelerating step subsequently to the first accelerating step.
  • the noise reference level of the laundry machine can be set based on the spinning cycle where the drum is spun at a maximum speed.
  • the noise reference level of the laundry machine is set based on the noise of the second target RPM at the second accelerating step.
  • the amount of washing water (hereinafter, referred to as'water content') remaining in the laundry is more than a predetermined value when the drum is accelerated to reach the second target RPM at the second accelerating step.
  • noise may occur in the range that exceeds the noise reference level which is previously set.
  • water contained in the laundry should be reduced to reach a predetermined value or more.
  • water should be removed from the laundry at the first accelerating step.
  • a value of the first target RPM and/or constant speed rotation duration of the first target RPM can be varied to control the water content (or water discharge) at the first accelerating step.
  • the water content that can reduce the noise occurring at the second accelerating step to reach the value of the noise reference level or less can be controlled appropriately depending on capacity of the drum and the tub in the laundry machine, the amount of laundry, and the amount of washing water.
  • the first target RPM and/or its constant speed rotation duration can be determined such that the water content becomes 40% to 60% or less of weight of the laundry loaded into the drum.
  • the first target RPM and/or its constant speed rotation duration can be determined such that the water discharge level at the first accelerating step is equal to or greater than that at the second accelerating step.
  • the first target RPM can be set in the range of 1100RPM to 1300RPM, approximately, and can be maintained for 80seconds to 100seconds, approximately.
  • the first target RPM can be maintained in the range of 1200RPM for 90seconds.
  • the control part carries out the balancing step S237 by decelerating the drum to reach the second rotation speed RPM 2.
  • the second rotation speed is set to be greater than the transient region of the laundry machine. The lower the RPM of the drum 30, 32 is, the better balancing is carried out. However, if the RPM of the drum 30, 32 is lowered than the transient region for balancing, noise and vibration may be generated by resonance. Accordingly, the balancing is preferably carried out at RPM more than the transient region. Accordingly, in this control method, the second rotation speed can be set in the range of 350RPM to 400RPM.
  • variation in eccentricity due to water discharge can be compensated by the balancing step S237.
  • the balls are located to correspond to the varied eccentricity at the balancing step, noise can be reduced when the drum is accelerated at the second accelerating step.
  • the laundry which is made of a material to be relatively difficult to remove water therefrom, remain at the second accelerating step. Accordingly, variation in eccentricity due to water discharge at the second accelerating step may not be greater than that at the first accelerating step.
  • noise can be minimized.
  • FIG. 5 is a graph illustrating a control method of a spinning cycle of a laundry machine according to the embodiment of the present invention.
  • the first target RPM is different from the second target RPM.
  • the control method will be described based on the difference between the first target RPM and the second target RPM.
  • the first target RPM at the first accelerating step S236 is different from the second target RPM at the second accelerating step S268. Moreover, the first target RPM at the first accelerating step S236 may be smaller than the second target RPM at the second accelerating step S268. In the aforementioned example of FIG. 4 , since the first target RPM is set equally to the second target RPM, noise due to variation in eccentricity at the first accelerating step may be increased to reach a predetermined value or more. Since such a noise during the spinning cycle may cause the user to feel displeasure, it is necessary to reduce noise at the first accelerating step. In order to reduce noise at the first accelerating step, the first target RPM is set differently from the second target RPM. Preferably, the first target RPM is set to be lower than the second target RPM. As the first target RPM is set to be lower than the second target RPM, noise at the spinning step can be reduced.
  • the first target RPM of the first accelerating step can be set to reach a noise reference level which is previously set at the second accelerating step subsequently to the first accelerating step.
  • the noise reference level of the laundry machine can be set based on the spinning cycle where the drum is spun at a maximum speed.
  • the noise reference level of the laundry machine is set based on the noise of the second target RPM at the second accelerating step.
  • the water content remaining in the laundry is more than a predetermined value when the drum is accelerated to reach the second target RPM at the second accelerating step.
  • noise may occur in the range that exceeds the noise reference level which is previously set.
  • water contained in the laundry should be reduced to reach a predetermined value or more.
  • water should be removed from the laundry at the first accelerating step.
  • a value of the first target RPM and/or constant speed rotation duration of the first target RPM can be varied to control the water content (or water discharge) at the first accelerating step.
  • the water content that can reduce the noise occurring at the second accelerating step to reach the value of the noise reference level or less can be controlled appropriately depending on capacity of the drum and the tub in the laundry machine, the amount of laundry, depending on capacity of the drum and the tub in the laundry machine, the amount of laundry, and the amount of washing water.
  • the first target RPM and/or its constant speed rotation duration can be determined such that the water content becomes 40% to 60% or less of weight of the laundry loaded into the drum.
  • the first target RPM and/or its constant speed rotation duration can be determined such that the water discharge level at the first accelerating step is equal to or greater than that at the second accelerating step. In this way, if the water content or water discharge level is set, average noise at the second accelerating step can be reduced to reach a predetermined value or less, for example, 55DB or less when the second accelerating step is carried out by balancing.
  • the control part carries out water discharge by accelerating the drum to reach the second target RPM (S238).
  • the second target RPM may be set previously by the control part, or may be carried out by input of the user.
  • the balancing step S237 at the first and second accelerating steps can be carried out depending on the value of the second target RPM. In other words, if the value of the second target RPM set previously by the control part or set by input of the user is greater than a predetermined value, the balancing step is carried out. If the value of the second target RPM set previously by the control part or set by input of the user is a predetermined value or less, the balancing step may not be carried out.
  • the predetermined value is variable, and for example, is set in the range of 1200RPM, approximately, in this embodiment.
  • the control method of the laundry machine may further include a balancing step S232 before the first accelerating step S236.
  • the balancing step serves to move the balls of the balancer to move to the eccentricity corresponding position before the drum is accelerated at a relatively high speed at the first accelerating step. Accordingly, noise that may occur at the first accelerating step can be reduced in a predetermined range.
  • a control method of a laundry machine includes an'intermediate spinning'step for removing water by accelerating the drum at RPM lower than the target RPM several times, before the accelerating step. If water is contained between the drum and the tub, it may cause noise and vibration when the drum is accelerated, especially it may disturb rotation of the drum when the drum is rotated at a high speed at the accelerating step. In this respect, in the control method of the laundry machine according to the related art, the intermediate spinning step has been required necessarily.
  • the control method of the laundry machine according to the embodiment of the present invention may omit the intermediate spinning step, whereby the time required for the spinning cycle can be reduced.
  • transient vibration region a region where irregular transient vibration with high amplitude occurs.
  • the transient vibration region irregularly occurs with high amplitude before vibration is transited to a steady-state vibration region (hereinafter, referred to as "steady-state region"), and has vibration characteristics determined if a vibration system (laundry machine) is designed.
  • steady-state region a steady-state vibration region
  • transient vibration occurs approximately in the range of 200rpm to 270rpm. It is regarded that transient vibration is caused by resonance. Accordingly, it is necessary to design the balancer by considering effective balancing at the transient vibration region.
  • the vibration source i.e., the motor and the drum connected with the motor are connected with the tub 12 through the rear gasket 250. Accordingly, vibration occurring in the drum is little forwarded to the tub, and the drum is supported by a damping means and the suspension unit 180 via a bearing housing 400. As a result, the tub 12 can directly be fixed to a cabinet 110 without any damping means.
  • vibration dislacement
  • a region hereinafter, referred to as "irregular vibration" where vibration becomes steady after passing through the transient vibration region and again becomes great may be generated.
  • irregular vibration For example, if the maximum drum displacement or more generated in an RPM band lower than the transient region or the maximum drum displacement or more of steady state step in a RPM band higher than the transient region is generated, it is determined that irregular vibration is generated.
  • an average drum displacement in the transient region +20% to -20% of the average drum displacement in the transient region or 1/3 or more of the maximum drum displacement in the natural frequency of the transient region are generated, it may be determined that the irregular vibration is generated.
  • irregular vibration has occurred in a RPM band higher than the transient region, for example has occurred at a region (hereinafter, referred to as "irregular vibration region") in the range of 350 rpm to 1000rpm, approximately. Irregular vibration may be generated due to use of the balancer, the damping system, and the rear gasket. Accordingly, in this laundry machine, it is necessary to design the balancer by considering the irregular vibration region as well as the transient vibration region.
  • the balancer is provide with a ball balancer
  • the structure of the balancer i.e., the size of the ball, the number of balls, a shape of the race, viscosity of oil, and a filling level of oil are selected by considering the irregular vibration region as well as the transient vibration region.
  • the ball balancer has a greater diameter of 255.8mm and a smaller diameter of 249.2.
  • a space of the race, in which the ball is contained, has a sectional area of 411.93mm 2 .
  • the number of balls is 14 at the front and the rear, respectively, and the ball has a size of 19.05mm.
  • Silicon based oil such as Poly Dimethylsiloxane (PDMS) is used as the oil.
  • PDMS Poly Dimethylsiloxane
  • oil has viscosity of 300CS at a room temperature, and has a filling level of 350cc.
  • the irregular vibration region as well as the transient vibration region is considered.
  • the balancing may be implemented at least one time before, while and after the drum speed passes the irregular vibration region.
  • the rotation speed of the drum is relatively high, the balancing of the balancer may not be implemented properly and the balancing may be implemented with decreasing the rotation speed of the drum.
  • the rotation speed of the drum is decreased to be lower than the transient region to implement the balancing, it has to pass the transient region again. In decreasing the rotation speed of the drum to implement the balancing, the decreased rotation speed may be higher than the transient region.
  • noise of the laundry machine can be reduced remarkably when the spinning cycle is carried out.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)

Claims (4)

  1. Procédé de commande d'un lave-linge comprenant un tambour (30 ; 32) et un dispositif d'équilibrage à billes (70) monté sur le tambour (30, 32) pour réduire le déséquilibre, le procédé de commande comprenant :
    une étape de répartition de linge (S100) pour faire tourner le tambour à une vitesse relativement basse afin de répartir uniformément le linge à l'intérieur du tambour ; et
    une étape d'essorage (S200) comprenant une étape de passage de région transitoire (S210) et une étape d'accélération (S230),
    dans lequel l'étape d'accélération (S230) comprend :
    une première étape d'accélération (S236) pour accélérer le tambour (30 ; 32) pour atteindre un premier régime cible pour une évacuation d'eau du linge et maintenir le premier régime cible pendant un temps prédéterminé ;
    une étape d'équilibrage (S237) pour effectuer un équilibrage par la décélération du tambour (30 ; 32) de sorte que la vitesse de tambour soit supérieure à un régime passant à travers une région transitoire et soit inférieure au premier régime cible et compenser toute variation d'excentricité en raison de l'évacuation d'eau du linge à la première étape d'accélération (S236) ; et
    une deuxième étape d'accélération (S238) pour accélérer le tambour (30 ; 32) pour atteindre un deuxième régime cible supérieur au premier régime cible pour l'évacuation d'eau du linge et maintenir le deuxième régime cible pendant un temps prédéterminé,
    dans lequel la région transitoire est une bande de régime prédéterminée comprenant au moins une fréquence de résonance qui génère une résonance en fonction du système du lave-linge.
  2. Procédé de commande selon la revendication 1, dans lequel la durée du premier régime cible à la première étape d'accélération (S236) est inférieure à la durée du deuxième régime cible à la deuxième étape d'accélération (S238).
  3. Procédé de commande selon la revendication 1, dans lequel, après l'exécution de la première étape d'accélération (S236), le premier régime cible et sa durée sont déterminés de sorte qu'une teneur en eau devienne de 40 % à 60 % ou moins d'un poids du linge chargé dans le tambour (30 ; 32).
  4. Procédé de commande selon la revendication 1, dans lequel le premier régime cible et sa durée sont déterminés de sorte que l'évacuation d'eau à la première étape d'accélération (S236) soit sensiblement supérieure ou égale à celle à la deuxième étape d'accélération (S238).
EP10812334.0A 2009-08-27 2010-08-27 Procédé de commande d'un lave-linge Active EP2470710B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020090080120A KR101940529B1 (ko) 2009-08-27 2009-08-27 세탁장치의 탈수행정 제어방법
KR1020090079923A KR20110022367A (ko) 2009-08-27 2009-08-27 세탁장치
KR1020090079912A KR101741549B1 (ko) 2009-08-27 2009-08-27 세탁장치 및 그 제어방법
PCT/KR2010/005817 WO2011025321A1 (fr) 2009-08-27 2010-08-27 Procédé de commande d'un lave-linge

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EP2470710A1 EP2470710A1 (fr) 2012-07-04
EP2470710A4 EP2470710A4 (fr) 2015-03-11
EP2470710B1 true EP2470710B1 (fr) 2017-10-04

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DE102010002048A1 (de) * 2010-02-17 2011-08-18 BSH Bosch und Siemens Hausgeräte GmbH, 81739 Verfahren zur Einstellung einer Schleuderdrehzahl einer Trommel eines Hausgeräts zur Pflege von Wäschestücken
KR102318153B1 (ko) * 2013-06-27 2021-10-28 삼성전자주식회사 밸런서 및 이를 갖춘 세탁기
KR101568905B1 (ko) * 2013-11-06 2015-11-12 동부대우전자 주식회사 드럼 세탁기
KR102257346B1 (ko) * 2014-08-22 2021-05-31 삼성전자주식회사 세탁기　및 세탁기의 제어방법
KR102401489B1 (ko) * 2015-12-24 2022-05-24 삼성전자주식회사 탈수 시 진동 저감 방법 및 이를 이용한 세탁기

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USRE37360E1 (en) * 1985-09-16 2001-09-11 Fisher & Paykel Electronic motor controls, laundry machines including such controls and/or methods of operating such controls
KR100634802B1 (ko) * 2004-07-20 2006-10-16 엘지전자 주식회사 드럼 세탁기
KR100686017B1 (ko) * 2005-05-11 2007-02-26 엘지전자 주식회사 세탁기
DE102006035014B4 (de) * 2005-08-01 2016-02-11 Lg Electronics Inc. Steuerverfahren für einen Schleudergang in einer Waschmaschine
EP1762648B1 (fr) * 2005-09-07 2016-11-02 LG Electronics Inc. Dispositif de contrôle pour commander l'essorage dans une machine à laver et procédé pour celui-ci
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EP2470710A4 (fr) 2015-03-11
US20120151685A1 (en) 2012-06-21
WO2011025321A1 (fr) 2011-03-03
EP2470710A1 (fr) 2012-07-04

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