EP0335790B1 - Perfectionnement aux moyens de détection de balourds dans les lave-linge - Google Patents

Perfectionnement aux moyens de détection de balourds dans les lave-linge Download PDF

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Publication number
EP0335790B1
EP0335790B1 EP89400858A EP89400858A EP0335790B1 EP 0335790 B1 EP0335790 B1 EP 0335790B1 EP 89400858 A EP89400858 A EP 89400858A EP 89400858 A EP89400858 A EP 89400858A EP 0335790 B1 EP0335790 B1 EP 0335790B1
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EP
European Patent Office
Prior art keywords
drum
inertia
machine according
speed
laundry
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.)
Expired - Lifetime
Application number
EP89400858A
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German (de)
English (en)
French (fr)
Other versions
EP0335790A1 (fr
Inventor
Jean-Marcel Duval
Benoit Gailledrat
Franck Violleau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Esswein SA
Original Assignee
Esswein SA
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Application filed by Esswein SA filed Critical Esswein SA
Publication of EP0335790A1 publication Critical patent/EP0335790A1/fr
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/16—Imbalance
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • 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
    • D06F2103/26—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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof

Definitions

  • the invention relates to means for detecting unbalances in the drum of a washing machine.
  • Such an unbalance detection means is inexpensive because the same signal is used for this detection and for speed regulation.
  • the error signal is compared with a limit value and if it exceeds this limit the drum is slowed down in order to prevent the imbalances thus detected from causing harmful consequences for the various parts of the machine when the drum rotates at high speed. speed.
  • the invention overcomes this drawback.
  • the washing machine according to the invention is characterized in that it comprises a means for measuring the inertia of the laundry on which the error signal and / or the limit value are made to depend. If the limit value is varied, the latter will be lower the higher the inertia; if the limit value remains constant, the measured error signal is increased, compared to this limit, as a function of the inertia.
  • the measurement of the inertia can be carried out for example as described in the French patent n ° 85 02969 also in the name of the plaintiff, that is to say by measurement of the driving torque of the drum with determined acceleration, in particular constant, of the latter.
  • the driving torque is measured by determining the intensity of the electric current passing through this motor.
  • the measurement of the inertia used to modify the error signal or the limit value ⁇ M is generally carried out just before spinning. For this measurement it is preferable that the speed of rotation of the drum is limited so as not to reach the speeds for which the machine enters into resonance. A speed limit of 150 revolutions per minute has proved acceptable for this measurement for a machine whose main critical speed is 180 rpm.
  • the embodiment of the invention relates to a washing machine for domestic use with a rotating drum with a horizontal axis.
  • This drum in a conventional manner, is cylindrical in shape with perforated walls to allow the water or the mixture of water and detergent present in the tank, to soak the laundry.
  • the operation is fully automatic, that is to say that the user does not have to intervene between the start and the end of the operation.
  • the various operations, controlled by a programmer, are, in general, prewash, washing, one or more rinses, and spinning.
  • the control is provided by a microprocessor 10 ( Figure 1).
  • the latter imposes on the universal motor 11 for driving the drum a set speed.
  • the microprocessor 10 acts on a circuit 12 for controlling the conduction time of a switch 13, such as a triac, in series with the universal motor 11 and the AC power source 14.
  • This circuit with switch 13 is of the phase-cutting type, that is to say that at each alternation of the alternating current produced by the generator 14 the switch 13 is open for a time which is a function of the desired speed for the engine 11.
  • a tachometer generator 15 is attached to the motor shaft 11, which supplies a signal representing the actual speed of this motor. This signal is applied to an input 101 of the microprocessor 10 to be compared to the set speed. The difference, called error signal ⁇ , between the actual speed and the set speed is used to regulate the speed. Speed regulation is called closed loop.
  • the error signal ⁇ is also used to detect unbalances and to slow down the rotation of the drum if this error signal, and therefore the unbalance, exceeds a predetermined limit value.
  • the microprocessor 10 is programmed to command a reduction in the speed of the drum when the error signal exceeds a limit value ⁇ M.
  • This unbalance detection is only used when starting the spin, that is to say when you start increasing the rotation speed of the drum. If, in this case, the error signal ⁇ exceeds the limit value ⁇ M, the speed of rotation of the drum is reduced to a speed corresponding to that for washing and the drum is left to rotate for a few seconds at this speed so that the laundry undergoes "steam release". At the end of this operation, the acceleration of the drum is started again, the imbalance having a high probability of having disappeared. Otherwise the drum is slowed down again. If after several attempts (for example three) to accelerate the unbalance remains, the rotation is stopped completely.
  • the invention therefore consists in modifying the signal ⁇ or the limit value ⁇ M as a function of this inertia.
  • ⁇ ⁇ 2 - ⁇ 1
  • ⁇ m is the average value of ⁇ between ⁇ 1 and ⁇ 2.
  • the error signal ⁇ decreases when the speed increases. It is therefore preferable to measure the unbalance for the speeds which are not too high, that is to say at the start of the acceleration, between the speed for which the laundry is pressed against the wall of the drum and the critical speed. .
  • FIGS. 2 a and 2 b The variation in the speed of rotation V (or ⁇ ) of the drum as a function of time t is shown in FIGS. 2 a and 2 b .
  • the speed V1 is the rotation speed of the drum for washing, and V2the spin speed.
  • the curve 20 in FIG. 2 a corresponds to a higher inertia of the linen than in the case of the curve 24 in FIG. 2 b , the unbalances being identical. In both cases we see that at the start of the acceleration the oscillations 22 have a greater amplitude than the oscillations 23 at the end of the acceleration.
  • the microprocessor is programmed to divide the limit value ⁇ M by a quantity which increases with the value J of the inertia.
  • the signal ⁇ used for detecting unbalances is multiplied by the value J of the inertia or by a quantity which varies like this inertia.
  • two distinct values are assigned to ⁇ M : a first value when the inertia of rotation of the laundry is less than a value J1 and a second value, less than the first, when the inertia of the laundry exceeds the value J1 .
  • ⁇ M several values depending on whether the inertia is less than a first value J1, between this first value and a second value J2, etc.
  • the multiplying coefficient of the signal ⁇ may have a first value for the inertias less than J1 and a second value for the inertias greater than J1.
  • the microprocessor comprises, for the detection of prohibitive unbalances, a table for converting the signal ⁇ as a function of the inertia J or a table for converting the limit ⁇ M as a function of this inertia J.
  • C e is the drive torque of the drum, i.e. the torque provided by the universal motor
  • C f is the friction torque due to the rotation of the drum
  • J0 the moment of inertia of the drum relative to its axis of rotation
  • ⁇ the speed of rotation of this drum, from dt acceleration
  • C b the torque due to unbalance.
  • J0 and C f are in principle constants.
  • C f can however vary from one machine to another even if the machines come from the same production line. If this is the case, the method of measuring C f described below can be used.
  • Acceleration from dt may be imposed by sanctuary; preferably it is equal to a known non-zero constant.
  • the moment of inertia J of the linen then only depends on the torque C e of driving the drum and on the oscillatory component C b sin ⁇ t due to the unbalance. But since the mean value of this oscillating component is zero, it does not not modify the mean value of the moment of inertia.
  • J depends only on the single parameter C e .
  • the mean value of the oscillatory component C b sin ⁇ t is zero, it is preferable that the measurement be made during an integer number of revolutions of the drum.
  • the moment of inertia J of the laundry only depends on the intensity of the electric current passing through the universal motor. It will be noted that due to the oscillatory component of the unbalance, the moment of inertia J is not directly a function of the instantaneous intensity of the electric current passing through the motor, but of the mean value of the effective intensity.
  • the drum is subjected to setpoint speed variations which are represented by the diagram in FIG. 3 which shows the variations as a function of time t of the setpoint speed of rotation. V (or ⁇ ) of the drum.
  • V or ⁇
  • the drum is rotated at a slightly increasing speed so that it reaches, at time t2, a speed of rotation of the order of 50 to 80 revolutions per minute.
  • This first phase aims to distribute the laundry uniformly in the drum.
  • the drum rotates at the constant speed V23 of the order of 50 to 80 revolutions per minute.
  • the speeds of 50 to 80 revolutions per minute which are given above by way of example are chosen in such a way that the distribution of the laundry is not changed. These speeds depend on the diameter of the drum; they decrease if the diameter increases.
  • the driving torque is equal to the friction torque C f1 .
  • the current absorbed by the motor thus has a relatively low effective intensity I V23 , as shown in FIG. 4 which represents the variations of the effective intensity I eff as a function of time t.
  • the speed V45 must be lower than the main critical speed of the machine, generally around 200 revolutions per minute. This critical speed is that for which the most significant vibrational resonance of the suspended assembly formed by the tank, the drive motor and the drum occurs.
  • I34 is the effective intensity of the electric current passing through the drum drive motor between times t3 and t4 and C f34 is the friction torque also between times t3 and t4.
  • K, I0, J0 and the acceleration from dt are constants imposed during the construction of the machine. I34 is measured for example in determining the voltage across a resistor in series with the motor. We can also measure the intensity I34 by determining the average phase angle of conduction of a controlled switch when (as in the example) we are dealing with a phase-cut regulation.
  • C f34 is not directly measurable; in the present case it is estimated that C f34 is the arithmetic mean between the friction couple C f23 , between the instants t2 and t3, and the friction couple C f45 between the instants t4 and t5.
  • C f23 and C f45 are easily measurable by the intensities I23 and I45 of the currents flowing through the universal motor between the times t respectivement and t3 and t4 and t5 respectively.
  • the precision of the servo-control be limited so that the error signal has a measurable value.
  • the accuracy of the speed measurement is around 3 revolutions per minute.
  • the limit value for example: when the inertia of the wet laundry corresponds to a mass of 3 kg brought (by calculation) to the periphery of the basket, the limit value ⁇ M is around 20 revolutions per minute. When this inertia of linen corresponds to a mass of 9 kg brought to the periphery of the basket, the limit value is of the order of 7 revolutions per minute.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP89400858A 1988-03-29 1989-03-28 Perfectionnement aux moyens de détection de balourds dans les lave-linge Expired - Lifetime EP0335790B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8804073A FR2629484B1 (fr) 1988-03-29 1988-03-29 Perfectionnement aux moyens de detection de balourds dans les lave-linge
FR8804073 1988-03-29

Publications (2)

Publication Number Publication Date
EP0335790A1 EP0335790A1 (fr) 1989-10-04
EP0335790B1 true EP0335790B1 (fr) 1992-07-22

Family

ID=9364723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89400858A Expired - Lifetime EP0335790B1 (fr) 1988-03-29 1989-03-28 Perfectionnement aux moyens de détection de balourds dans les lave-linge

Country Status (5)

Country Link
EP (1) EP0335790B1 (el)
DE (1) DE68902158T2 (el)
ES (1) ES2034666T3 (el)
FR (1) FR2629484B1 (el)
GR (1) GR3005829T3 (el)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2665271B1 (fr) * 1990-07-24 1992-11-13 Sextant Avionique Procede de commande de la vitesse de rotation du tambour d'une machine a essorage centrifuge en fonction du balourd et machine pour la mise en óoeuvre de ce procede.
DE4221772A1 (de) * 1992-07-02 1994-01-05 Licentia Gmbh Verfahren zur Unwuchterkennung in Haushalt-Waschmaschinen
US5301523A (en) * 1992-08-27 1994-04-12 General Electric Company Electronic washer control including automatic balance, spin and brake operations
IT1267586B1 (it) 1994-09-28 1997-02-07 Zanussi Elettrodomestici Lavabiancheria con dispositivo perfezionato anti-sbilanciamento
IT1293962B1 (it) * 1997-08-11 1999-03-15 Elbi Int Spa Macchina operatrice ed utilizzo di un trasduttore di pressione in una macchina operatrice.
EP1609901A1 (en) * 2004-06-24 2005-12-28 Electrolux Home Products Corporation N.V. Haushold laundry washing machine with improved spinning phase
ES2351008B1 (es) * 2008-04-25 2011-11-18 Bsh Electrodomesticos España, S.A. Metodo para determinar una velocidad funcional de centrifugado maxima permisible del tambor de una maquina lavadora y maquina lavadora que utiliza dicho metodo.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2524020A1 (fr) * 1982-03-26 1983-09-30 Esswein Sa Machine a laver le linge a moyens de detection de balourds
DE3416639A1 (de) * 1984-05-05 1985-11-07 Miele & Cie GmbH & Co, 4830 Gütersloh Verfahren zur steuerung des schleuderprogramms einer waschmaschine
FR2577949B1 (fr) * 1985-02-28 1988-02-12 Esswein Sa Machine a laver et a essorer a duree d'essorage variable
DE3606819A1 (de) * 1986-03-03 1987-09-10 Licentia Gmbh Verfahren zur korrektur des unwuchtgroessengrenzwertes fuer eine programmgesteuerte waschmaschine

Also Published As

Publication number Publication date
GR3005829T3 (el) 1993-06-07
FR2629484A1 (fr) 1989-10-06
ES2034666T3 (es) 1993-04-01
FR2629484B1 (fr) 1990-11-16
EP0335790A1 (fr) 1989-10-04
DE68902158T2 (de) 1993-01-14
DE68902158D1 (de) 1992-08-27

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