[go: up one dir, main page]

WO2000028128A1 - Method for controlling the off-balance state of the load of a washing machine - Google Patents

Method for controlling the off-balance state of the load of a washing machine Download PDF

Info

Publication number
WO2000028128A1
WO2000028128A1 PCT/EP1999/008041 EP9908041W WO0028128A1 WO 2000028128 A1 WO2000028128 A1 WO 2000028128A1 EP 9908041 W EP9908041 W EP 9908041W WO 0028128 A1 WO0028128 A1 WO 0028128A1
Authority
WO
WIPO (PCT)
Prior art keywords
speed
phase
dium
drum
balance state
Prior art date
Application number
PCT/EP1999/008041
Other languages
French (fr)
Inventor
Mirco Cauz
Original Assignee
Electrolux Zanussi S.P.A.
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
Application filed by Electrolux Zanussi S.P.A. filed Critical Electrolux Zanussi S.P.A.
Publication of WO2000028128A1 publication Critical patent/WO2000028128A1/en

Links

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
    • 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
    • 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 
    • D06F33/48—Preventing or reducing imbalance or noise

Definitions

  • the present invention refeis to an improved method for controlling, in an automatic clothes washing machine, the off-balance condition m which the washload may be set whenever the lotational speed of the drum of the machine is changed in view of carrying out a spin-extraction phase or cycle.
  • Working programmes of household-type clothes washing machines are generally known to traditionally comprise mainly a washing phase, in which the washload-holdmg dium is d ⁇ ven to rotate at a low speed (preferably in an alternately dnection reveismg mode), a spin-extraction run-up oi washload distribution phase, in which the rotating speed of the dium is gradually increased up to an intermediate value and, finally, an actual spm-exti action phase, in which the rotating speed of the drum is increased to a maximum value.
  • the washload contained m the lotatmg drum tends to get distributed in an irregular manner, ie. unevenly in the same drum, thereby bringing about unbalance moments that are the cause of mechanical stresses.
  • a correct distribution of the washload in the drum is particularly important during the spin-extraction lun-up phase, which is usually carried out at rotating speeds of the drum comprised between approx. 50 and 90 rpm, since it is actually this phase that conditions m a decisive mannei also the subsequent high-speed spm-exti action phase
  • Such sti esses can damage the washing assembly of the machine and, anyway, jeopaidize the stability of the same machine, they are a source of noise and aie mdesn ably ti ansmitted to the flooi
  • Anothei diawback of the pnoi-ait solutions lies in the fact that the operation of each contiol system is closely con elated to the technical and dimensional characteristics of the washing machine, so that the system itself must be reset and leiated each time that it is applied foi use in washing machines that have differing charactenstics
  • the clothes washing machine can be noticed to be of a tiaditional type foi household oi lesidential applications compiismg mamly a dium 4 adapted to hold the washload and be lotatably d ⁇ ven by an electric motoi 5, the lattei being foi instance of the asynchi onous single-phase type
  • the motoi 5 also dnves a tachometiic geneiatoi 6, oi similar speed measmmg device, which m turn dnves a piogiammable contiol device 7 with a signal that is indicative of the instant i otatmg speed of the motoi 5 and, theiefoie, the drum 4
  • the contiol device 7 piefeiably comp ⁇ ses a cropiocessoi , which may foi instance be of the Motoi ola 68HC1 1 type, and has a contiol output 9 that is adapted to dnve a powei stage 8 foi supplying the motoi 5 in a vanable-speed mode
  • the powei stage 8 is piefeiably of the type compiismg at least a Tiiac, adapted to be conti oiled in a phase-conti ol mode to co espondmgly vary the I otatmg speed of the motoi 5 and the dium 4
  • the control device 7 can be easily pi ogi ammed accoi ding to specific needs to automatically control the l otatmg spee ⁇ el the motoi 5
  • the output 9 of the device 7 controls the powei stage 8 and theiefoie the motoi 5 with an eiroi signal that vanes according to both the pie-set piogiamme and the signal being leceived fiom the tachomet ⁇ c geneiatoi 6, which is indicative of the instant speed of the dium 4
  • the contiol device 7 is theiefoie capable of easily measmmg also the instant off-balance state B of the dium 4
  • the contiol device 7 can be noticed to be geneially piogiammed foi cairymg out at least a woi g oi opeiational cycle compiismg following mam phases in a sequence
  • washing and/oi linsmg phase tO - tl in which, in a geneially pei se known mannei , the clothes in the dium 4 is soaked with watei (or wash liquoi) and the dium itself is dnven to lotate lepeatedly (and piefei bly in alternately opposite dnections) duimg penods T, wheiem the dium 4 lotates at a low speed VO that is piefeiably of appiox 55 m duimg this phase
  • a conect balancing of the drum 4 during the spm-exti action lun-up phase tl - t2 (which in practice is a phase of initial spm-exti action at an mtei mediate speed) is critical m view of a good operation of the clothes washing machine duimg the actual spin-extraction phase t2 - 13
  • the spm-exti action lun-up phase tl - 12 is now descnbed m greatei detail with lefeience to also Figuie 3, m which the continuous-line curve and the dashed-lme one lepiesent the vanations vs time of the instant speed and the lated speed of the dium 4, lespectively It should be noticed that the teim "rated speed" is used heie to mean the speed commanded by the contiol device 7 in accoi dance with the pie-set pi ogi amme selected
  • the contiol device 7 is set so as to be able to detect the afoie mentioned instant off-balance state B of the dium 4 sequentially (eg at pi e-detei mined fixed intervals of appiox 160 msec)
  • the stage 8 is dnven so as to accelei ate the i otatmg dium 4 thiough a speed increment I, which may foi instance be of appiox 2 ipm
  • the stage 8 is dnven so as to decelerate the dium 4 by a soeed deciement D Piefeiably, although not solely, the speed mciements I and the speed deciements D aie the same, le equal to each othei , and substantially constant m lesponse to each detection of said off-balance condition B
  • the I otatmg speed of the dium 4 is giadually mci eased up to said mtei mediate value VI only if and when the dium itself is detected to be sufficiently balanced
  • the piactical lesult is that, when the spm-exti action lun-up phase leaches its conclusion at the instant t2 and the actual spm-exti action phase t2 - 13 is theiefore due to begin , the I otatmg dium 4 is certainly m an optimally balanced state
  • the off-balance state B of the dium 4 is smallei than the pi e-detei mined thieshold value, so that the lated speed of the same dium is mci eased by an mciement I in lesponse to each one of the afoi e mentioned detections
  • the off-balance condition B is on the contiaiy detected to be gi eatei than said pi e-detei mined thieshold value, so that the above cited l ated speed of the dium is deci eased by a deciement D m lesponse to each one of said detections
  • the giaduality and the peiiodicity of speed mciements and deciements duimg the spm-exti action n-up phase enable this same phase to be earned thiough m advantageously short penods of time, without any need foi the same phase to be lestarted fiom an initial condition Furtheimoie the l apidity with which optimum conditions of balanced state of the dium aie leached ensuies an impioved oveiall stability of the washing machine, with coiiespondmg technical advantages
  • the method accoidmg to the present invention is capable of being implemented m different machines without any need ansmg foi appiop ate lesettmgs or lei atmgs to be earned out
  • Fuitheimoie the method accoidmg to the piesent nvention can be easily rmplemented in any traditional type of automatic washing machines (pieferably provrded wrth on electronic control system) without any need aiismg foi them to undeigo paiticulai spactuial modifications It will anyway be appieciated that the washing machine can also make use of different means to detect the off-balance state of the drum such as foi instance electiomechanical devices of any suitable kind
  • the above descnbed method can be the subject of a numbei of modifications without depaitmg fi om the scope of the pi esent invention
  • the sequential detection of the off-balance state B can be carried out at variable intervals, instead of fixed ones, and/oi it is the pie-determined off-balance threshold that may be vanable
  • sard off-balance thieshold can be substantially decreasing with the increase of the speed of the dium 4

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detergent Compositions (AREA)

Abstract

The method comprises a run-up phase (t1-t2) in which the drum of the washing machine is accelerated from a low rotating speed (V0) up to an intermediate rotating speed (V1) so as to distribute the washload along the walls of the drum. During this phase, the instant off-balance state (B) of the drum (4) is detected periodically and, in response to each such detection, the drum is accelerated by an increment (I), or decelerated by an increment (D), according to whether said detected off-balance (B) is smaller or greater, respectively, than a pre-set threshold value. A spin-extraction phase is finally started with the drum rotating at a high speed (V2).

Description

METHOD FOR CONTROLLING THE OFF-BALANCE STATE OF THE LOAD
OF A WASHING MACHINE
DESCRIPTION
The present invention refeis to an improved method for controlling, in an automatic clothes washing machine, the off-balance condition m which the washload may be set whenever the lotational speed of the drum of the machine is changed in view of carrying out a spin-extraction phase or cycle.
Working programmes of household-type clothes washing machines are generally known to traditionally comprise mainly a washing phase, in which the washload-holdmg dium is dπven to rotate at a low speed (preferably in an alternately dnection reveismg mode), a spin-extraction run-up oi washload distribution phase, in which the rotating speed of the dium is gradually increased up to an intermediate value and, finally, an actual spm-exti action phase, in which the rotating speed of the drum is increased to a maximum value.
As each such woikmg cycle of the machine is carried out, the washload contained m the lotatmg drum tends to get distributed in an irregular manner, ie. unevenly in the same drum, thereby bringing about unbalance moments that are the cause of mechanical stresses.
A correct distribution of the washload in the drum is particularly important during the spin-extraction lun-up phase, which is usually carried out at rotating speeds of the drum comprised between approx. 50 and 90 rpm, since it is actually this phase that conditions m a decisive mannei also the subsequent high-speed spm-exti action phase
In piesence of a maiked unbalance condition of the washload in a drum rotating at a high spm-exti action speed, the machine can m fact be subjected to unacceptably heavy mechanical sti esses
Such sti esses can damage the washing assembly of the machine and, anyway, jeopaidize the stability of the same machine, they are a source of noise and aie mdesn ably ti ansmitted to the flooi
A numbei of solutions have been pioposed m view of limiting the extent of the pioblems ongmated by off-balance conditions of the washload m washing machines, particularly duimg the spm-exti action lun-up phase Howevei , none of them appeal s to be fully satisfactory
Foi example fiom the disclosuie in EP-A-0 704 567 the solution is known which calls foi the dium to be dnven thiough a sequence of I evolutions at a low spm-exti action speed, a shoit impulse of the same dium at an lnteimediate spm-exti action speed a 1 eduction of the i otatmg speed at a low spm-exti action level, and then a new mciease of the same speed to said intermediate spm-exti action value If an excessive oi anyway significant unbalance condition of is detected oi identified befoie said impulse the piocess stalls again fiom the beginning with the above mentioned sequence of low-speed I evolutions
Accoi mg to this solution the vanations m the 1 otatmg speeds of the dium aie substantially pie-set m view of one oi moie unbalance checking or identifying ti nsients In othei woids they do not take into account in a continuous mannei all possible unbalance conditions that may aiise duπng said spm-exti action lun-up phase Moieovei if an excessive off-balance condition is detected duimg detei mined opei ational phases of the machine, the piocess, le sequence, is stalled again fiom a pieceαmg phase As a lesult, foi a conect condition of well-balanced washload foi high-speed spm-exti action, an undesnably long time may become necessary
Anothei diawback of the pnoi-ait solutions lies in the fact that the operation of each contiol system is closely con elated to the technical and dimensional characteristics of the washing machine, so that the system itself must be reset and leiated each time that it is applied foi use in washing machines that have differing charactenstics
It would theiefoie be desnable, and is actually a mam purpose of the piesent invention to piovide a method foi contiollmg the off-balance condition of the load m a clothes washing machine, which is theiefoie capable of minimizing the problems and diawbacks of pnoi-ait solutions
It is m paiticulai a puipose of the piesent invention to piovide a method of the above cited kind which enables the clothes spm-exti action piocess and in particulai the lun-up phase theieof to be earned out m a substantially short time
It is yet anothei puipose of the piesent invention to piovide a method of the above cited kind that is capable of being implemented without any substantial modification oi variation in clothes washing machines having diffeient technical and dimensional chaiacteiistics
Accoidmg to the piesent invention these and fuithei aims aie leached in a method foi contiollmg the off-balance state of the load of a clothes washing machine embodyng the chai acteiistics as lecited m the appended claims
Featmes and advantages of the piesent invention will anyway be moie leadily and cleaily undei stood fiom the descπption that is given below by way of non-limiting example with I efei ence to the accompanying di awmgs in which - Figui e 1 is a schematical block diagram of a control system for the drive motor of the dium of a clothes washing machine, adapted to implement the method accoidmg to the piesent invention,
- Figuies 2 and 3 aie diagiams lllustiatmg schematically different operational phases of the washing machine accoidmg to a piefened embodiment of the piesent invention
With lefeience to Figuie 1 , the clothes washing machine can be noticed to be of a tiaditional type foi household oi lesidential applications compiismg mamly a dium 4 adapted to hold the washload and be lotatably dπven by an electric motoi 5, the lattei being foi instance of the asynchi onous single-phase type
The motoi 5 also dnves a tachometiic geneiatoi 6, oi similar speed measmmg device, which m turn dnves a piogiammable contiol device 7 with a signal that is indicative of the instant i otatmg speed of the motoi 5 and, theiefoie, the drum 4
The contiol device 7 piefeiably compπses a miciopiocessoi , which may foi instance be of the Motoi ola 68HC1 1 type, and has a contiol output 9 that is adapted to dnve a powei stage 8 foi supplying the motoi 5 in a vanable-speed mode The powei stage 8 is piefeiably of the type compiismg at least a Tiiac, adapted to be conti oiled in a phase-conti ol mode to co espondmgly vary the I otatmg speed of the motoi 5 and the dium 4
In a mannei mat is geneially known to those skilled in the art, the control device 7 can be easily pi ogi ammed accoi ding to specific needs to automatically control the l otatmg speeα el the motoi 5 In paiticulai , the output 9 of the device 7 controls the powei stage 8 and theiefoie the motoi 5 with an eiroi signal that vanes according to both the pie-set piogiamme and the signal being leceived fiom the tachometπc geneiatoi 6, which is indicative of the instant speed of the dium 4
Also known -s the fact that the signal pioduced by the geneiator 6 contains mfoimation I elating to the instant off-balance state B of the dium 4 Such an off-balance state B, m fact, is a function of the angular acceleiation of the drum, as well as of the deviation of the instant speed of the same drum from the lated speed commanded by the contiol device 7
The instant off-balance state (or instant off-balance index) can therefoie be expiessed by the formula B = f (dV, a), where dV is the above mentioned speed deviation, and a is the angulai acceleiation of the dium
All m all, the contiol device 7 is theiefoie capable of easily measmmg also the instant off-balance state B of the dium 4
Refemng also to Figuie 2, the contiol device 7 can be noticed to be geneially piogiammed foi cairymg out at least a woi g oi opeiational cycle compiismg following mam phases in a sequence
- a washing and/oi linsmg phase tO - tl in which, in a geneially pei se known mannei , the clothes in the dium 4 is soaked with watei (or wash liquoi) and the dium itself is dnven to lotate lepeatedly (and piefei bly in alternately opposite dnections) duimg penods T, wheiem the dium 4 lotates at a low speed VO that is piefeiably of appiox 55 m duimg this phase
- a spm-exti action lun-up phase tl - 12 which will be explained in gieatei detail furthei on, m which the clothes must be distiibuted by centnfugal effect along the side walls of the dium 4 in a substantially balanced, le even mannei , in view of minimizing an off-balance state of the washing machine, wheiem the dium 4 is acceleiated up to leaching a pi e-detei mined mtei mediate speed VI , which is pi efei ably of appi ox 115 I pm dm mg this phase ,
- at least an actual spm-exti action phase t2 - 13 in which the dium is acceleiated lapidly up to a pi e-detei mined high I evolution speed V2, which may foi instance leach up to anywheie between appiox 600 and 1000 lpm, and is then substantially maintained at such a speed so as to effectively lemove the moisture from the washed clothes by centiifugal effect
As already pointed out befoie, a conect balancing of the drum 4 during the spm-exti action lun-up phase tl - t2 (which in practice is a phase of initial spm-exti action at an mtei mediate speed) is critical m view of a good operation of the clothes washing machine duimg the actual spin-extraction phase t2 - 13
The spm-exti action lun-up phase tl - 12 is now descnbed m greatei detail with lefeience to also Figuie 3, m which the continuous-line curve and the dashed-lme one lepiesent the vanations vs time of the instant speed and the lated speed of the dium 4, lespectively It should be noticed that the teim "rated speed" is used heie to mean the speed commanded by the contiol device 7 in accoi dance with the pie-set pi ogi amme selected
Accoidmg to a featme of the piesent invention, the contiol device 7 is set so as to be able to detect the afoie mentioned instant off-balance state B of the dium 4 sequentially (eg at pi e-detei mined fixed intervals of appiox 160 msec)
As a lesponse to each such sequential detection, if said off-balance state B turns out to be smallei than le lie below a certain pie-set thieshold value, the stage 8 is dnven so as to accelei ate the i otatmg dium 4 thiough a speed increment I, which may foi instance be of appiox 2 ipm
If said off-balance state B is on the contiary detected to be gieatei than, le lie above said pie detei mined thieshold value, the stage 8 is dnven so as to decelerate the dium 4 by a soeed deciement D Piefeiably, although not solely, the speed mciements I and the speed deciements D aie the same, le equal to each othei , and substantially constant m lesponse to each detection of said off-balance condition B
Such an opei ation goes on thioughout the spm-exti action lun-up phase until, at the instant t2 the afoie mentioned mtei mediate speed VI is eventually leached Theiefoie the spm-exti action lun-up phase tl - t2 turns out to be fiequently conti oiled in a sequential mannei m accordance with the actual operating conditions In particulai , if the dium 4 is detected to be in an excessively gieat off-balance state, it is deceleiated by one 01 moie speed deciements D, so as to enable the clothes to distnbute moie evenly in the drum, until an acceptable off-balance condition, le a sufficiently balanced state is eventually leached
It is in fact only m the presence of a sufficiently balanced condition of the dium 4 that the lattei is acceleiated by one oi moie speed mciements I, until an off-balance state of an excessively gieat extent possibly develops
In othei woids the I otatmg speed of the dium 4 is giadually mci eased up to said mtei mediate value VI only if and when the dium itself is detected to be sufficiently balanced
The piactical lesult is that, when the spm-exti action lun-up phase leaches its conclusion at the instant t2 and the actual spm-exti action phase t2 - 13 is theiefore due to begin , the I otatmg dium 4 is certainly m an optimally balanced state
In the example lllustiated m Figuie 3 at the mteivals indicated at P the off-balance state B of the dium 4 is smallei than the pi e-detei mined thieshold value, so that the lated speed of the same dium is mci eased by an mciement I in lesponse to each one of the afoi e mentioned detections
At the intervals indicated at S in the same Figuie the off-balance condition B is on the contiaiy detected to be gi eatei than said pi e-detei mined thieshold value, so that the above cited l ated speed of the dium is deci eased by a deciement D m lesponse to each one of said detections
It should be noticed that the giaduality and the peiiodicity of speed mciements and deciements duimg the spm-exti action n-up phase enable this same phase to be earned thiough m advantageously short penods of time, without any need foi the same phase to be lestarted fiom an initial condition Furtheimoie the l apidity with which optimum conditions of balanced state of the dium aie leached ensuies an impioved oveiall stability of the washing machine, with coiiespondmg technical advantages
Such an impioved oveiall stability of the washing machine makes in turn it possible foi the biakmg coefficient of the shock-absoibers connected to the suspended washing assembly of the machine to be reduced, so that a smaller extent of foi ce ti ansmission advantageously occurs from the machine to the floor during the spm-exti action phase
A furthei important advantage of the method accoidmg to the piesent invention, as it could be venfied also on an expenmental basis, lies in the fact that the entne balancing system of the washing machine is scaicely sensitive to vanations in machine pai ameteis (such as foi example the volume of the drum 4, the geai oi velocity I atio of the motoi 5 to the dium, the type of drive belt, the type of motor 5, the type of suspensions and spimgs and the like)
In an advantageous mannei theiefoie, the method accoidmg to the present invention is capable of being implemented m different machines without any need ansmg foi appiop ate lesettmgs or lei atmgs to be earned out
Fuitheimoie the method accoidmg to the piesent nvention can be easily rmplemented in any traditional type of automatic washing machines (pieferably provrded wrth on electronic control system) without any need aiismg foi them to undeigo paiticulai stiuctuial modifications It will anyway be appieciated that the washing machine can also make use of different means to detect the off-balance state of the drum such as foi instance electiomechanical devices of any suitable kind
It will also be appieciated that the above descnbed method can be the subject of a numbei of modifications without depaitmg fi om the scope of the pi esent invention For instance, the sequential detection of the off-balance state B can be carried out at variable intervals, instead of fixed ones, and/oi it is the pie-determined off-balance threshold that may be vanable
In particular, sard off-balance thieshold can be substantially decreasing with the increase of the speed of the dium 4

Claims

1. Method foi controlling the off-balance state of the washload contained m a l otatmg dium of a clothes washing machine adapted to sequentially carry out
- a washing and/oi nnsing phase (tO-tl) in which the dium is driven to rotate at a low speed (VO)
- a spm-exti action lun-up phase (tlJ2) in which the drum is accelerated until it leaches an mtei mediate speed (VI) so as to enable the washload to evenly distnbute along the walls of the drum
- at least a spm-exti action phase (t2J3) in which the dium is dnven to lotate at a high speed (V2) foi centirfugally removmg the moistuie from the washload, characterized in that dunng sa d spm-exti action run-up phase (tl-t2) the instant off-balance state (B) of the i otatmg dium (4) is detected sequentially and, in response to each one of said sequential detections, the drum is either accelerated by a pi e-detei mined speed inclement (I) oi deceleiated by a pre-determmed speed deciement (D) depending on whethei the off-balance state (B) is detected to be smallei oi gieatei I espectivelyJhj an a pi e-detei mined thieshold value
2 Method accoi ding to claim 1 characterized in that said sequential detections of the instant off-balance state (B) aie peifoimed at pi e-detei mined fixed intervals
3 Method according to claim 1 characterized in that said sequential detections of the instant off-balance state (B) aie peifoimed at vanable intervals
4 Method accoidmg to claim 1 characterized in that said mciement (I) is equal to sard decrement (D)
5 Method accoidmg to claim 1 characterized in that said mciement (I) and deciement (D) are substantially constant rn lesponse to each one of sard detections
PCT/EP1999/008041 1998-11-10 1999-10-23 Method for controlling the off-balance state of the load of a washing machine WO2000028128A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN98A000081 1998-11-10
IT1998PN000081A IT1305553B1 (en) 1998-11-10 1998-11-10 METHOD FOR CHECKING THE UNBALANCING OF THE LOAD IN A WASHING MACHINE

Publications (1)

Publication Number Publication Date
WO2000028128A1 true WO2000028128A1 (en) 2000-05-18

Family

ID=11395439

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/008041 WO2000028128A1 (en) 1998-11-10 1999-10-23 Method for controlling the off-balance state of the load of a washing machine

Country Status (2)

Country Link
IT (1) IT1305553B1 (en)
WO (1) WO2000028128A1 (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1331300A2 (en) * 2002-01-23 2003-07-30 Miele & Cie. KG Washing machine with a drive system
EP1362946A2 (en) * 2002-05-17 2003-11-19 Lg Electronics Inc. Dehydration control method of drum washing machine
EP1548169A1 (en) * 2002-07-22 2005-06-29 Kabushiki Kaisha Toshiba Drum washing machine
EP1568813A1 (en) * 2004-02-27 2005-08-31 Lg Electronics Inc. Washing machine and method for controlling the same
WO2008006675A1 (en) * 2006-07-12 2008-01-17 BSH Bosch und Siemens Hausgeräte GmbH Method for the control of a spinning cycle of a washing machine and a washing machine suitable for performing said method
WO2008075987A2 (en) * 2006-12-21 2008-06-26 Fisher & Paykel Appliances Limited Improved laundry appliance
EP2013397A2 (en) * 2006-04-05 2009-01-14 LG Electronics, Inc. Spin drying method
DE102008055091A1 (en) 2008-12-22 2010-06-24 BSH Bosch und Siemens Hausgeräte GmbH Method for controlling a laundry distribution operation of a household appliance for the care of laundry
US8042211B2 (en) 2005-08-16 2011-10-25 Whirlpool Corporation Method of detecting an off-balance condition of a clothes load in a washing machine
US8151393B2 (en) 2008-05-23 2012-04-10 Lg Electronics Inc. Washing machine and method of controlling a washing machine
RU2455407C1 (en) * 2011-02-21 2012-07-10 Государственное образовательное учреждение высшего профессионального образования "Южно-Российский государственный университет экономики и сервиса" (ГОУ ВПО "ЮРГУЭС") Method to reduce vibration during wringing in washing machines of drum type
US8220093B2 (en) 2008-05-23 2012-07-17 Lg Electronics Inc. Washing machine and method of controlling a washing machine
US8302232B2 (en) 2008-05-23 2012-11-06 Lg Electronics Inc. Washing machine and method of controlling a washing machine
US8365334B2 (en) 2008-05-23 2013-02-05 Lg Electronics Inc. Washing machine and method of controlling a washing machine
US8679198B2 (en) 2008-05-23 2014-03-25 Lg Electronics Inc. Washing machine and method of controlling a washing machine
US8930031B2 (en) 2008-12-17 2015-01-06 Fisher & Paykel Appliances Limited Laundry machine
US8938835B2 (en) 2008-05-23 2015-01-27 Lg Electronics Inc. Washing machine and method of controlling a washing machine
CN105970549A (en) * 2016-06-29 2016-09-28 无锡小天鹅股份有限公司 Spin-drying control method and device for washing machine and washing machine
CN106436155A (en) * 2016-10-08 2017-02-22 珠海格力电器股份有限公司 Dehydration method, dehydration device and washing machine
EP3511462A4 (en) * 2016-09-12 2020-05-06 LG Electronics Inc. -1- Method for controlling spin-drying operation of washing apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4513464A (en) * 1982-12-14 1985-04-30 Sulzer-Escher Wyss Ltd. Method for controlling the acceleration of a centrifuging device
GB2174513A (en) * 1985-05-03 1986-11-05 Hoover Plc Spin speed control means for laundry spin driers
US5341452A (en) * 1990-12-19 1994-08-23 Fisher & Paykel Limited Electronic controls for electric motors, laundry machines including such controls and motors and/or methods of operating said controls
EP0704567A1 (en) * 1994-09-28 1996-04-03 ELECTROLUX ZANUSSI ELETTRODOMESTICI S.p.A. Improvement in an unbalance preventing arrangement for clothes washing machines
GB2322141A (en) * 1997-02-12 1998-08-19 Toshiba Kk Control of spin-drying phase of washing machine
EP0899371A2 (en) * 1997-08-29 1999-03-03 Kabushiki Kaisha Toshiba Motor speed control for washing machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4513464A (en) * 1982-12-14 1985-04-30 Sulzer-Escher Wyss Ltd. Method for controlling the acceleration of a centrifuging device
GB2174513A (en) * 1985-05-03 1986-11-05 Hoover Plc Spin speed control means for laundry spin driers
US5341452A (en) * 1990-12-19 1994-08-23 Fisher & Paykel Limited Electronic controls for electric motors, laundry machines including such controls and motors and/or methods of operating said controls
EP0704567A1 (en) * 1994-09-28 1996-04-03 ELECTROLUX ZANUSSI ELETTRODOMESTICI S.p.A. Improvement in an unbalance preventing arrangement for clothes washing machines
GB2322141A (en) * 1997-02-12 1998-08-19 Toshiba Kk Control of spin-drying phase of washing machine
EP0899371A2 (en) * 1997-08-29 1999-03-03 Kabushiki Kaisha Toshiba Motor speed control for washing machine

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1331300A3 (en) * 2002-01-23 2006-05-10 Miele & Cie. KG Washing machine with a drive system
EP1331300A2 (en) * 2002-01-23 2003-07-30 Miele & Cie. KG Washing machine with a drive system
EP1362946A2 (en) * 2002-05-17 2003-11-19 Lg Electronics Inc. Dehydration control method of drum washing machine
EP1362946A3 (en) * 2002-05-17 2004-03-03 Lg Electronics Inc. Dehydration control method of drum washing machine
EP1516952A2 (en) * 2002-05-17 2005-03-23 LG Electronics Inc. Dehydration control method of drum washing machine
EP1516952A3 (en) * 2002-05-17 2005-07-27 LG Electronics Inc. Dehydration control method of drum washing machine
US7059002B2 (en) 2002-05-17 2006-06-13 Lg Electronics Inc. Dehydration control method of drum washing machine
CN1671907B (en) * 2002-07-22 2010-06-23 株式会社东芝 Drum washing machine controlling method
EP1548169A1 (en) * 2002-07-22 2005-06-29 Kabushiki Kaisha Toshiba Drum washing machine
EP1548169A4 (en) * 2002-07-22 2006-08-16 Toshiba Kk Drum washing machine
EP1568813A1 (en) * 2004-02-27 2005-08-31 Lg Electronics Inc. Washing machine and method for controlling the same
US8042211B2 (en) 2005-08-16 2011-10-25 Whirlpool Corporation Method of detecting an off-balance condition of a clothes load in a washing machine
EP2013397A2 (en) * 2006-04-05 2009-01-14 LG Electronics, Inc. Spin drying method
EP2013397A4 (en) * 2006-04-05 2010-08-25 Lg Electronics Inc Spin drying method
WO2008006675A1 (en) * 2006-07-12 2008-01-17 BSH Bosch und Siemens Hausgeräte GmbH Method for the control of a spinning cycle of a washing machine and a washing machine suitable for performing said method
AU2007334750B2 (en) * 2006-12-21 2011-12-01 Fisher & Paykel Appliances Limited Improved laundry appliance
WO2008075987A2 (en) * 2006-12-21 2008-06-26 Fisher & Paykel Appliances Limited Improved laundry appliance
US8590083B2 (en) 2006-12-21 2013-11-26 Fisher & Paykel Appliances Limited Laundry appliance
WO2008075987A3 (en) * 2006-12-21 2008-07-31 Fisher & Paykel Appliances Ltd Improved laundry appliance
US8365334B2 (en) 2008-05-23 2013-02-05 Lg Electronics Inc. Washing machine and method of controlling a washing machine
DE102009021941B4 (en) 2008-05-23 2020-01-23 Lg Electronics Inc. Washing machine and method for controlling such
DE102009021947B4 (en) 2008-05-23 2020-07-23 Lg Electronics Inc. Washing machine and method for controlling such
US8220093B2 (en) 2008-05-23 2012-07-17 Lg Electronics Inc. Washing machine and method of controlling a washing machine
US8302232B2 (en) 2008-05-23 2012-11-06 Lg Electronics Inc. Washing machine and method of controlling a washing machine
US8151393B2 (en) 2008-05-23 2012-04-10 Lg Electronics Inc. Washing machine and method of controlling a washing machine
US8938835B2 (en) 2008-05-23 2015-01-27 Lg Electronics Inc. Washing machine and method of controlling a washing machine
US8679198B2 (en) 2008-05-23 2014-03-25 Lg Electronics Inc. Washing machine and method of controlling a washing machine
US8930031B2 (en) 2008-12-17 2015-01-06 Fisher & Paykel Appliances Limited Laundry machine
DE102008055091A1 (en) 2008-12-22 2010-06-24 BSH Bosch und Siemens Hausgeräte GmbH Method for controlling a laundry distribution operation of a household appliance for the care of laundry
WO2010072556A1 (en) * 2008-12-22 2010-07-01 BSH Bosch und Siemens Hausgeräte GmbH Method for controlling a laundry distribution mode of a domestic appliance for caring for laundry items
RU2455407C1 (en) * 2011-02-21 2012-07-10 Государственное образовательное учреждение высшего профессионального образования "Южно-Российский государственный университет экономики и сервиса" (ГОУ ВПО "ЮРГУЭС") Method to reduce vibration during wringing in washing machines of drum type
CN105970549A (en) * 2016-06-29 2016-09-28 无锡小天鹅股份有限公司 Spin-drying control method and device for washing machine and washing machine
EP3511462A4 (en) * 2016-09-12 2020-05-06 LG Electronics Inc. -1- Method for controlling spin-drying operation of washing apparatus
US11098431B2 (en) 2016-09-12 2021-08-24 Lg Electronics Inc. Method for controlling spin-drying operation of washing apparatus
CN106436155A (en) * 2016-10-08 2017-02-22 珠海格力电器股份有限公司 Dehydration method, dehydration device and washing machine
CN106436155B (en) * 2016-10-08 2018-10-23 珠海格力电器股份有限公司 Dehydration method, dehydration device and washing machine
US11479893B2 (en) 2016-10-08 2022-10-25 Gree Electric Appliances, Inc. Of Zhuhai Method and apparatus for washing machine dehydration, and washing machine

Also Published As

Publication number Publication date
ITPN980081A1 (en) 2000-05-10
IT1305553B1 (en) 2001-05-09

Similar Documents

Publication Publication Date Title
WO2000028128A1 (en) Method for controlling the off-balance state of the load of a washing machine
EP1362946B1 (en) Dehydration control method of drum washing machine
US6393918B2 (en) Method and apparatus for detecting washing machine tub imbalance
US6047428A (en) Method for detecting an unbalanced drum in a drum type washing machine
US7530132B2 (en) Method for controlling spinning in drum-type washing machine
EP1533411A2 (en) Washing machine and method of controlling the same
AU2007261687B2 (en) Laundry machine control system for load imbalance detection and extraction speed selection
EP0704567B1 (en) Improvement in an unbalance preventing arrangement for clothes washing machines
JP2009213803A (en) Drum washing machine
EP3511462B1 (en) Method for controlling spin-drying operation of washing apparatus
US8302232B2 (en) Washing machine and method of controlling a washing machine
CN1517475A (en) Method for controlling dewatering speed of washing machine
KR101114740B1 (en) Method and apparatus for controlling dehydration of washing machine
CN100351452C (en) Drum washer
CN1418273A (en) Laundry appliance
KR20050105731A (en) (a) drum type washing machine and method of controlling the same
AU2020379453B2 (en) Washing machine and spin-drying control method for washing machine
JP2010284288A (en) Washing machine
KR100413467B1 (en) Method for controlling dehydration in drum-type washing machine
EP0736625B1 (en) Improvement in the unbalance-preventing means of a top-loading clothes washing machine
KR100315806B1 (en) Driving method for washing machine
JP3536565B2 (en) Washing machine
EP0711860A1 (en) Improvement in the spin-extraction phase of a clothes washing machine
KR101183904B1 (en) Washing machine
KR101073500B1 (en) Drum Type Washing Machine

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase