EP0345120A1 - Washing machine or dryer with means for automatically determining the weight of the laundry - Google Patents

Washing machine or dryer with means for automatically determining the weight of the laundry Download PDF

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Publication number
EP0345120A1
EP0345120A1 EP89401403A EP89401403A EP0345120A1 EP 0345120 A1 EP0345120 A1 EP 0345120A1 EP 89401403 A EP89401403 A EP 89401403A EP 89401403 A EP89401403 A EP 89401403A EP 0345120 A1 EP0345120 A1 EP 0345120A1
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EP
European Patent Office
Prior art keywords
drum
acceleration
motor
washing machine
speed
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Granted
Application number
EP89401403A
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German (de)
French (fr)
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EP0345120B1 (en
Inventor
Jean-Luc Roux
Bernard Delhomme
François Garofalo
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Compagnie Industrielle dAppareils Menagers SA CIAPEM
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Compagnie Industrielle dAppareils Menagers SA CIAPEM
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Priority claimed from FR8807216A external-priority patent/FR2631988B1/en
Application filed by Compagnie Industrielle dAppareils Menagers SA CIAPEM filed Critical Compagnie Industrielle dAppareils Menagers SA CIAPEM
Priority to AT89401403T priority Critical patent/ATE85370T1/en
Publication of EP0345120A1 publication Critical patent/EP0345120A1/en
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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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/50—Control of washer-dryers characterised by the purpose or target of the control
    • D06F33/52—Control of the operational steps, e.g. optimisation or improvement of operational steps depending on the condition of 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/04—Quantity, e.g. weight or variation of weight
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/24—Spin speed; Drum movements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D06F2103/46—Current or voltage of the motor driving the drum
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/18—Condition of the laundry, e.g. nature or weight

Definitions

  • the invention relates to a washing machine or dryer type laundry rotating drum which comprises means for automatically detecting the load of laundry introduced into the drum.
  • a household washing machine usually has a rotating drum in which the laundry is placed. This drum is perforated and is placed in a tank receiving the water or the mixture of water and detergent. The mixing of the linen is obtained for example by means of projections inside the drum.
  • the volume of water introduced into the machine the quantity of detergent and other parameters, such as the durations of the various phases of operation of the washing machine: prewash, wash, rinse, spin, depend of the load of laundry introduced into the machine.
  • the invention relates to an improvement in the washing machine described in this European patent 84 402090. It allows a more precise measurement. It also makes it possible, in one embodiment, to simplify the manufacture of the washing machine, in particular by doing without means for measuring the intensity of the electric current passing through the drive motor of the drum.
  • the washing machine or dryer comprises, for determining the load of laundry in the drum, a means of measuring the moment of inertia of the laundry with respect to the axis of rotation of this drum, this measurement being obtained by rotating the drum at constant acceleration. It is characterized in that the drum is rotated successively according to two different values of constant acceleration, and in that the moment of inertia is determined from a difference between, on the one hand, a measurement carried out during of the first acceleration, and on the other hand, a measurement carried out during the second acceleration.
  • the value 6 of the phase angle of a control with phase control of the speed of the drum is used, without involving the intensity of the electric current passing through the motor.
  • the moment of inertia is determined from a difference between a measurement of the intensity of the electric current passing through the motor produced during the first acceleration and a measurement of this intensity passing through the motor during the second acceleration .
  • the invention relates to a washing machine or dryer, characterized in that the universal drum drive motor being supplied with alternating current and its speed being determined by a phase control command by to a processor, in particular a microprocessor, this processor determines the moment of inertia from the value of the phase angle.
  • the washing machine (not shown as a whole) is of the domestic type with a washing drum with a perforated cylindrical wall rotating around a horizontal axis inside a tank.
  • the electric motor 10 (FIG. 1) for driving the drum is of the universal type. It is supplied with alternating current 11, for example at the frequency of 50 Hz from the network, by means of a controlled switch 12 such as a triac.
  • a microprocessor 13 is provided, connected to the triac control electrode 12 via an interface circuit 14.
  • the microprocessor 13 imposes on the motor 10 a set speed dependent on a program prerecorded in its memory. This microprocessor also constitutes the comparator for speed regulation. To this end, it has an input 13 to which the output signal of a tachometer generator 15 driven by the motor 10 is applied.
  • the microprocessor 13 controls the angle 8 (FIG. 2) of opening of the triac 12 at each alternation of the alternating signal 11, that is to say the duration during which this switch 12 is conductive during each period of this signal 11.
  • the opening angle 8 has been shown on the abscissa and the signal on the ordinate alternating 11.
  • the triac is open, that is to say nonconductive, between the angles 0 and 6 and conductor between angles 6 and n.
  • the microprocessor 13 which supplies the triac 12 closing control pulse.
  • this phase angle ⁇ which is determined by the microprocessor 13, is used for the measurement of the moment of inertia L of laundry in the drum, i.e. for the measurement of the laundry load.
  • C is the engine torque
  • L the moment of inertia of the laundry with respect to the axis of the drum
  • J the moment of inertia of the drum with respect to its axis of rotation
  • d ⁇ / dt the acceleration ( or decelaration) of the rotation of the drum
  • C R the resistant torque opposed by the drum.
  • the motor torque is proportional to the intensity of the electric current flowing through it, that is to say:
  • K is a constant specific to the motor and 1 the intensity of the electric current flowing through it.
  • the microprocessor periodically determines, every twenty milliseconds (that is to say at the frequency of 50 Hz) in the example, the value of the angle 8 1 for controlling the triac 12 and this angle is stored; the microprocessor also determines the sum, noted ⁇ 1 , of all these angles 6 1 .
  • the value of the phase control angle ⁇ 2 of the triac 12 is determined every 80 milliseconds (four times twenty milliseconds) and, as for the first ramp, the sum ⁇ 2 of all these angles that we put in memory.
  • the sampling period is the same during the second ramp, that is to say that in the example the number of samples is four times greater for the second ramp than for the first.
  • the microprocessor calculates the quantity D such that:
  • the sampling period during the second ramp must be ⁇ times greater than during the first ramp, ⁇ being the ratio between the first and second acceleration. If the sampling period is the same for the two ramps, it will then be necessary to assign to the sum of the angles 8 for the second ramp a division factor equal to this same ratio ⁇ between the first and the second acceleration.
  • the washing machine according to the invention is of a particularly simple embodiment since it does not require any particular means of measuring the intensity of the electric current passing through the motor 10.
  • the indication of load of linen is more precise than with the provisions described in said European patent mentioned above because the calculation carried out makes it possible to eliminate the factor C R in all rigor. It is of course not essential that the second ramp 21 immediately follow the first ramp 20 as shown in Figure 3; it is possible to separate the end of the first ramp from the start of the second ramp.
  • FIGS. 4 and 5 another embodiment of the invention which also allows a more precise measurement of the laundry load thanks to the elimination of the factor C R. He distinguishes himself of the embodiment previously described by the fact that the measurement involves the intensity of the electric current passing through the motor instead of the phase angle.
  • ⁇ is calculated from ⁇ .
  • the calculation is carried out in the example using a microprocessor.
  • the drum drive motor Before introducing water into the machine, the drum drive motor is rotated at a speed V corresponding for example to 200 revolutions / minute for the drum, then from time t 1 (FIG. 4) this constant acceleration speed is increased to a speed V 2 , for example corresponding to a rotation speed of around 400 revolutions / minute for the drum.
  • the duration of this ramp up is A ti, between the instants ti and t 2 , that is to say approximately 4 seconds in the example.
  • the intensity I of the current passing through the motor and these intensities are stored in memory.
  • the microprocessor also determines the sum, denoted 1 1 , of all these intensities li.
  • the intensity 1 2 of the current passing through the motor is determined every 80 milliseconds (four times twenty milliseconds) and, as for the first ramp, the sum E 1 2 of all these intensities that we put in memory.
  • the sampling period is the same during the second ramp, that is to say that in the example the number of samples is four times greater for the second ramp than for the first.
  • the microprocessor calculates the quantity D such that:
  • the sampling period during the second ramp must be posted times greater than during the first ramp, ⁇ being the ratio between the first and second acceleration. If the sampling period is the same for the two ramps then it will be necessary to assign to the sum of the intensities 1 for the second ramp a division factor equal to this same ratio between the first and the second acceleration.
  • the formula (27) above shows that it is not essential to carry out a sum of samples during each ramp. It suffices to measure the intensity of the current for a speed V i determined during the first ramp, to measure the intensity of the current during the second ramp for the same speed Vi and to make the difference between these two intensities to obtain a quantity proportional to L + J.
  • the laundry load can be determined not only before any water is introduced into the washing machine, but also at other times during the operation of the machine.
  • the invention also applies to a dryer.

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

Abstract

Washing machine or drier with means for determining the moment of inertia of the laundry in relation to the axis of rotation of this drum. The drive motor of the drum, being of the universal type, is supplied with alternating current, and its speed (V) is determined by a phase-control command via a microprocessor which determines the moment of inertia from the value ( theta ) of the phase angle. The microprocessor commands the rotation of the drum at a first acceleration between two speeds V1 and V2 and sums the values theta 1 of the phase angle measured periodically, then commands a second acceleration ramp (21) between the same speeds at a different acceleration and sums the phase angles theta 2 determined periodically. The microprocessor consequently calculates the difference between the two sums. <IMAGE>

Description

L'invention est relative à une machine à laver ou sécher le linge de type à tambour tournant qui comporte des moyens de détection automatique de la charge de linge introduite dans ce tambour.The invention relates to a washing machine or dryer type laundry rotating drum which comprises means for automatically detecting the load of laundry introduced into the drum.

Un lave-linge domestique comporte habituellement un tambour tournant dans lequel est disposé le linge. Ce tambour est perforé et est disposé dans une cuve recevant l'eau ou le mélange d'eau et de produit lessiviel. Le brassage du linge est obtenu par exemple grâce à des saillies à l'intérieur du tambour.A household washing machine usually has a rotating drum in which the laundry is placed. This drum is perforated and is placed in a tank receiving the water or the mixture of water and detergent. The mixing of the linen is obtained for example by means of projections inside the drum.

Il est en général préférable que le volume d'eau introduit dans la machine, la quantité de produit lessiviel et d'autres paramètres, tels que les durées des diverses phases de fonctionnement du lave-linge : prélavage, lavage, rinçage, essorage, dépendent de la charge de linge introduite dans la machine.It is generally preferable that the volume of water introduced into the machine, the quantity of detergent and other parameters, such as the durations of the various phases of operation of the washing machine: prewash, wash, rinse, spin, depend of the load of laundry introduced into the machine.

Dans la brevet européen n° 84 402090 au nom de la Société ESSWEIN on a proposé un lave-linge dans lequel la charge de linge est mesurée par le moment d'inertie L du linge autour de l'axe de rotation du tambour. Ce moment d'inertie est déterminé par le couple d'entraînement du tambour à accélération déterminée non nulle, de préférence constante. Quand le tambour est entraîné par un moteur électrique du type universal le couple est mesuré par l'intensité du courant électrique traversant le moteur. Mais cette détermination fait intervenir une estimation du couple résistant (CR) qu'oppose le tambour. Cette estimation confère une imprécision à la mesure de charge de linge.In European patent n ° 84 402090 in the name of the company ESSWEIN, a washing machine has been proposed in which the load of laundry is measured by the moment of inertia L of the laundry around the axis of rotation of the drum. This moment of inertia is determined by the driving torque of the drum at a non-zero determined acceleration, preferably constant. When the drum is driven by an electric motor of the universal type, the torque is measured by the intensity of the electric current flowing through the motor. However, this determination involves an estimate of the resistant torque (C R ) opposed by the drum. This estimate gives inaccuracy to the measurement of laundry load.

L'invention se rapporte à un perfectionnement au lave-linge décrit dans ce brevet européen 84 402090. Elle permet une mesure plus précise. Elle permet aussi, dans une réalisation, de simplifier la fabrication du lave-linge, notamment en se passant d'un moyen de mesure de l'intensité du courant électrique traversant le moteur d'entraînement du tambour.The invention relates to an improvement in the washing machine described in this European patent 84 402090. It allows a more precise measurement. It also makes it possible, in one embodiment, to simplify the manufacture of the washing machine, in particular by doing without means for measuring the intensity of the electric current passing through the drive motor of the drum.

Le lave-linge ou sèche-linge selon l'invention comprend, pour déterminer la charge de linge dans le tambour, un moyen de mesure du moment d'inertie du linge par rapport à l'axe de rotation de ce tambour, cette mesure étant obtenue en faisant tourner le tambour à accélération constante. Il est caractérisé en ce qu'on fait tourner le tambour successivement suivant deux valeurs différentes d'accélération constante, et en ce que le moment d'inertie est déterminé à partir d'une différence entre, d'une part, une mesure réalisée lors de la première accélération, et d'autre part, une mesure réalisée lors de la seconde accélération.The washing machine or dryer according to the invention comprises, for determining the load of laundry in the drum, a means of measuring the moment of inertia of the laundry with respect to the axis of rotation of this drum, this measurement being obtained by rotating the drum at constant acceleration. It is characterized in that the drum is rotated successively according to two different values of constant acceleration, and in that the moment of inertia is determined from a difference between, on the one hand, a measurement carried out during of the first acceleration, and on the other hand, a measurement carried out during the second acceleration.

De cette manière on élimine le paramètre CR du calcul.In this way we eliminate the parameter C R from the calculation.

Dans une première réalisation de l'invention on utilise la valeur 6 de l'angle de phase d'une commande à contrôle de phase de la vitesse du tambour, sans faire intervenir l'intensité du courant électrique traversant le moteur.In a first embodiment of the invention, the value 6 of the phase angle of a control with phase control of the speed of the drum is used, without involving the intensity of the electric current passing through the motor.

Dans une seconde réalisation le moment d'inertie est déterminé à partir d'une différence entre une mesure de l'intensité du courant électrique traversant le moteur réalisé lors de la première accélération et une mesure de cette intensité traversant le moteur lors de la seconde accélération.In a second embodiment, the moment of inertia is determined from a difference between a measurement of the intensity of the electric current passing through the motor produced during the first acceleration and a measurement of this intensity passing through the motor during the second acceleration .

Selon un autre aspect, l'invention se rapporte à un lave-linge ou sèche-linge, caractérisé en ce que le moteur universal d'entraînement du tambour étant alimenté en courant alternatif et sa vitesse étant déterminée par une commande à contrôle de phase grâce à un processeur, notamment un microprocesseur, ce processeur détermine le moment d'inertie à partir de la valeur de l'angle de phase.According to another aspect, the invention relates to a washing machine or dryer, characterized in that the universal drum drive motor being supplied with alternating current and its speed being determined by a phase control command by to a processor, in particular a microprocessor, this processor determines the moment of inertia from the value of the phase angle.

On voit qu'ainsi c'est le processeur qui détermine le moment d'inertie sans qu'il soit besoin de prévoir un moyen particulier de mesure de l'intensité du courant électrique traversant le moteur.It is thus seen that it is the processor which determines the moment of inertia without it being necessary to provide a particular means of measuring the intensity of the electric current passing through the motor.

D'autres caractéristiques et avantages de l'invention apparaîtront avec la description de certains de ses modes de réalisation, celle-ci étant effectuée en se référant aux dessins ci-annexés sur lesquels :

  • - la figure 1 est un schéma montrant un moteur d'entraînement de tambour de lave-linge avec son circuit de commande,
  • - les figures 2 et 3 sont des diagrammes illustrant une commande de lave-linge selon l'invention, et
  • - les figures 4 et 5 sont d'autres diagrammes illustrant le fonctionnement d'un lave-linge pour une variante.
Other characteristics and advantages of the invention will appear with the description of some of its embodiments, this being carried out with reference to the attached drawings in which:
  • FIG. 1 is a diagram showing a washing machine drum drive motor with its control circuit,
  • FIGS. 2 and 3 are diagrams illustrating a washing machine control according to the invention, and
  • - Figures 4 and 5 are other diagrams illustrating the operation of a washing machine for a variant.

Dans l'exemple le lave-linge (non montré dans son ensemble) est du type domestique avec un tambour à linge à paroi cylindrique perforée tournant autour d'un axe horizontal à l'intérieur d'une cuve.In the example the washing machine (not shown as a whole) is of the domestic type with a washing drum with a perforated cylindrical wall rotating around a horizontal axis inside a tank.

Le moteur électrique 10 (figure 1) d'entraînement du tambour est du type universel. Il est alimenté en courant alternatif 11, par exemple à la fréquence de 50 Hz du réseau, par l'intermédiaire d'un interrupteur commandé 12 tel qu'un triac.The electric motor 10 (FIG. 1) for driving the drum is of the universal type. It is supplied with alternating current 11, for example at the frequency of 50 Hz from the network, by means of a controlled switch 12 such as a triac.

Pour la commande de l'interrupteur 12 et donc du moteur 10 on prévoit un microprocesseur 13 relié l'électrode de commande de triac 12 par l'intermédiaire d'un circuit interface 14.For the control of the switch 12 and therefore of the motor 10, a microprocessor 13 is provided, connected to the triac control electrode 12 via an interface circuit 14.

Le microprocesseur 13 impose au moteur 10 une vitesse de consigne dépendant d'un programme préenregistré dans sa mémoire. Ce microprocesseur constitue également le comparateur pour la régulation de vitesse. A cet effet, il présente une entrée 13 sur laquelle est appliqué le signal de sortie d'une génératrice tachymétrique 15 entraînée par le moteur 10.The microprocessor 13 imposes on the motor 10 a set speed dependent on a program prerecorded in its memory. This microprocessor also constitutes the comparator for speed regulation. To this end, it has an input 13 to which the output signal of a tachometer generator 15 driven by the motor 10 is applied.

Le microprocesseur 13 commande l'angle 8 (figure 2) d'ouverture du triac 12 à chaque alternance du signal alternatif 11, c'est-à-dire la durée pendant laquelle cet interrupteur 12 est conducteur au cours de chaque période de ce signal 11.The microprocessor 13 controls the angle 8 (FIG. 2) of opening of the triac 12 at each alternation of the alternating signal 11, that is to say the duration during which this switch 12 is conductive during each period of this signal 11.

Sur le diagramme de la figure 2 on a représenté en abscisses l'angle d'ouverture 8 et en ordonnées le signal alternatif 11. Au cours d'une alternance du signal 11, c'est-à-dire pour des angles de phase θ compris entre 0 et π radians, le triac est ouvert, c'est-à-dire non conducteur, entre les angles 0 et 6 et conducteur entre les angles 6 et n. C'est le microprocesseur 13 qui fournit l'impulsion de commande de fermeture du triac 12. Selon un aspect de l'invention cet angle de phase θ, qui est déterminé par le microprocesseur 13, est utilisé pour la mesure du moment d'inertie L du linge dans le tambour, c'est-à-dire pour la mesure de la charge de linge.On the diagram of FIG. 2, the opening angle 8 has been shown on the abscissa and the signal on the ordinate alternating 11. During an alternation of the signal 11, that is to say for phase angles θ between 0 and π radians, the triac is open, that is to say nonconductive, between the angles 0 and 6 and conductor between angles 6 and n. It is the microprocessor 13 which supplies the triac 12 closing control pulse. According to one aspect of the invention, this phase angle θ, which is determined by the microprocessor 13, is used for the measurement of the moment of inertia L of laundry in the drum, i.e. for the measurement of the laundry load.

En effet on part de la formule suivante :

Figure imgb0001
Indeed we start from the following formula:
Figure imgb0001

Dans cette formule C est le couple moteur, L le moment d'inertie du linge par rapport à l'axe du tambour, J le moment d'inertie du tambour par rapport à son axe de rotation, d ω /dt l'accélération (ou décélaration) de la rotation du tambour et CR le couple résistant qu'oppose le tambour.In this formula C is the engine torque, L the moment of inertia of the laundry with respect to the axis of the drum, J the moment of inertia of the drum with respect to its axis of rotation, d ω / dt the acceleration ( or decelaration) of the rotation of the drum and C R the resistant torque opposed by the drum.

Pour un moteur universel le couple moteur est proportionnel à l'intensité du courant électrique qui le traverse, c'est-à-dire :

Figure imgb0002
For a universal motor, the motor torque is proportional to the intensity of the electric current flowing through it, that is to say:
Figure imgb0002

Dans cette formule K est une constante propre au moteur et 1 l'intensité du courant électrique qui le traverse.In this formula K is a constant specific to the motor and 1 the intensity of the electric current flowing through it.

De plus on sait que la force contre-électromotrice E du moteur universel est proportionnelle à sa vitesse de rotation ; on peut donc écrire :

Figure imgb0003
In addition, we know that the counter-electromotive force E of the universal motor is proportional to its speed of rotation; we can therefore write:
Figure imgb0003

Dans cette formule K est une constante.In this formula K is a constant.

On sait aussi que la tension U aux bornes du moteur est liée à la force contre-électromotrice E, à la résistance électrique R présentée par ce moteur et à l'intensité I par la relation suivante :

Figure imgb0004
We also know that the voltage U across the motor is related to the counter-electromotive force E, the electrical resistance R presented by this motor and the intensity I by the following relationship:
Figure imgb0004

De cette formule on déduit :

Figure imgb0005
From this formula we deduce:
Figure imgb0005

Or, la tension U fournie au moteur est (figure 2) fonction de l'angle 6, c'est-à-dire :

Figure imgb0006
Dans cette formule Vs est l'amplitude maximum de la tension 11. Des formules (5) et (6) ci-dessus on déduit :
Figure imgb0007
 However, the voltage U supplied to the motor is (FIG. 2) a function of the angle 6, that is to say:
Figure imgb0006
 In this formula Vs is the maximum amplitude of the voltage 11. From formulas (5) and (6) above we deduce:
Figure imgb0007

Selon un aspect de l'invention pour le calcul de L (le moment d'inertie du linge) on fait l'approximation suivante : on considère que f(θ) est proportionnel à θ, c'est-à-dire qu'on peut écrire :

Figure imgb0008
K1 étant une constante. Δinsci
Figure imgb0009
 According to one aspect of the invention for the calculation of L (the moment of inertia of the laundry) we make the following approximation: we consider that f (θ) is proportional to θ, that is to say that can write:
Figure imgb0008
 K 1 being a constant. Δinsci
Figure imgb0009

Dans la relation (9) ci-dessus V , Ki, K', R, K, J et CR sont des constantes, ω est une donnée introduite (grâce à la génératrice tachymétrique 15) à l'entrée 13 du microprocesseur 13 et les données 0 et d ω /dt sont calculées par le microprocesseur. Il en résulte que le microprocesseur 13 peut être programmé pour calculer le moment d'inertie L à partir de la formule (9) ci-dessus.In relation (9) above V, K i , K ', R, K, J and C R are constants, ω is a datum introduced (thanks to the tachometric generator 15) at the input 13 of the microprocessor 13 and the data 0 and d ω / dt are calculated by the microprocessor. As a result, the microprocessor 13 can be programmed to calculate the moment of inertia L from the formula (9) above.

Toutefois pour simplifier le calcul, et pour que ce calcul ne dépende pas de la valeur du couple résistant C qui peut varier avec la vitesse, on préfère procéder de la façon suivante :

  • Le microprocesseur est programmé de façon telle qu'avant d'introduire de l'eau dans la machine on fait tourner le moteur 10 à une vitesse V correspondant par exemple à 200 tours/minute pour le tambour, puis à partir de l'instant t1 (figure 3) on augmente cette vitesse à accélération constante jusqu'à une vitesse V2 , par exemple correspondant à une vitesse de rotation de 400 tours/minute environ pour le tambour. La durée de cette rampe de montée en vitesse est Δt1 c'est-à-dire 4 secondes environ dans l'exemple.
However, to simplify the calculation, and so that this calculation does not depend on the value of the resistive torque C which can vary with speed, we prefer to proceed as follows:
  • The microprocessor is programmed in such a way that before introducing water into the machine, the motor 10 is made to rotate at a speed V corresponding for example to 200 revolutions / minute for the drum, then from the instant t 1 (FIG. 3), this speed is increased at constant acceleration to a speed V 2 , for example corresponding to a rotation speed of around 400 revolutions / minute for the drum. The duration of this ramp-up is Δt 1, that is to say approximately 4 seconds in the example.

Ensuite on ramène la vitesse de rotation du moteur à la valeur Vi puis on recommence l'accélération du tambour avec une accélération différente, quatre fois plus petite dans l'exemple. On arrête cette seconde accélération lorsque la vitesse du moteur atteint la valeur V2. La durée de cette rampe est Δt2. Etant donné que l'accélération est quatre fois inférieure on peut écrire :

Figure imgb0010
Then the motor speed is reduced to the value Vi and then the acceleration of the drum is started again with a different acceleration, four times smaller in the example. This second acceleration is stopped when the motor speed reaches the value V 2 . The duration of this ramp is Δt 2 . Since the acceleration is four times lower we can write:
Figure imgb0010

Au cours de la première période de durée Δt1 le microprocesseur détermine périodiquement, tout les vingt millisecondes (c'est-à-dire à la fréquence de 50 Hz) dans l'exemple, la valeur de l'angle 81 de commande du triac 12 et cet angle est mis en mémoire; le microprocesseur détermine aussi la somme, notée Σθ1, de tous ces angles 61.During the first period of duration Δt 1 the microprocessor periodically determines, every twenty milliseconds (that is to say at the frequency of 50 Hz) in the example, the value of the angle 8 1 for controlling the triac 12 and this angle is stored; the microprocessor also determines the sum, noted Σθ 1 , of all these angles 6 1 .

Au cours de la seconde rampe de durée t2 on détermine toutes les 80 millisecondes (quatre fois vingt millisecondes) la valeur de l'angle ω2 de commande de phase du triac 12 et, comme pour la première rampe, on effectue la somme Σω2 de tous ces angles que l'on met en mémoire.During the second ramp of duration t 2, the value of the phase control angle ω 2 of the triac 12 is determined every 80 milliseconds (four times twenty milliseconds) and, as for the first ramp, the sum Σω 2 of all these angles that we put in memory.

Ensuite on effectue la différence entre ces deux sommes soit :

Figure imgb0011
Then we make the difference between these two sums either:
Figure imgb0011

Cette différence D est proportionnelle à L + J, c'est-à-dire représente la charge de linge dans le tambour. En effet:

  • Lorsque la vitesse de rotation du moteur a la valeur V; au cours de la première rampe, la relation (9) ci-dessus s'écrit :
    Figure imgb0012
This difference D is proportional to L + J, that is to say represents the load of laundry in the drum. Indeed:
  • When the engine speed is V; during the first ramp, the relation (9) above is written:
    Figure imgb0012

Dans cette formule : 1

Figure imgb0013
In this formula: 1
Figure imgb0013

Lorsque la vitesse de rotation du moteur a la même valeur Vi au cours de la seconde rampe, la relation (9) s'écrit encore :

Figure imgb0014
When the engine speed has the same value V i during the second ramp, the relation (9) is still written:
Figure imgb0014

Dans cette formule :

Figure imgb0015
In this formula:
Figure imgb0015

Si on effectue la différence membre à membre entre les relations (12) et (14) ci-dessus on obtient :

Figure imgb0016
If we make the member-to-member difference between relations (12) and (14) above we obtain:
Figure imgb0016

On observera que dans les formules (12) et (14) les termes

Figure imgb0017
CR s'éliminent en toute rigueur car ces formules correspondent aux mêmes vitesses de rotation, donc aux mêmes valeurs de couple résistant CR.It will be observed that in the formulas (12) and (14) the terms
Figure imgb0017
 C R are eliminated in all rigor because these formulas correspond to the same rotational speeds, therefore to the same values of resistant torque C R.

Le nombre n de mesures de l'angle 8 ou nombre n d'échantillonnages, étant le même pour les deux rampes d'accélération on peut écrire :

Figure imgb0018
The number n of measurements of angle 8 or number n of samples, being the same for the two acceleration ramps, we can write:
Figure imgb0018

On voit donc que la différence D =Σθ1 -Σθ2 est bien proportionnelle à L + J.We therefore see that the difference D = Σθ 1 -Σθ 2 is indeed proportional to L + J.

En variante la période d'échantillonnage est la même au cours de la seconde rampe, c'est-à-dire que dans l'exemple le nombre d'échantillons est quatre fois supérieur pour la seconde rampe que pour la première . Dans ce cas il faut diviser la sommes des valeurs de 82 par quatre pour obtenir la grandeur D proportionnelle à L + J, c'est-à-dire que le microprocesseur calcule la qrandeur D telle que :

Figure imgb0019
As a variant, the sampling period is the same during the second ramp, that is to say that in the example the number of samples is four times greater for the second ramp than for the first. In this case it is necessary to divide the sum of the values of 8 2 by four to obtain the quantity D proportional to L + J, that is to say that the microprocessor calculates the quantity D such that:
Figure imgb0019

De façon générale si on veut le même nombre n d'échantillons au cours des deux rampes il faut que la période d'échantillonnage au cours de la seconde rampe soit λ fois plus importante qu'au cours de la première rampe, λ étant le rapport entre la première et la seconde accélération. Si la période d'échantillonnage est la même pour les deux rampes il faudra alors affecter à la somme des angles 8 pour la seconde rampe un facteur de division égal à ce même rapport λ entre la première et la seconde accélération.Generally if the same number n of samples is desired during the two ramps, the sampling period during the second ramp must be λ times greater than during the first ramp, λ being the ratio between the first and second acceleration. If the sampling period is the same for the two ramps, it will then be necessary to assign to the sum of the angles 8 for the second ramp a division factor equal to this same ratio λ between the first and the second acceleration.

Quel que soit le mode de réalisation le lave-linge selon l'invention est d'une réalisation particulièrement simple car il ne nécessite pas de moyen particulier de mesure de l'intensité du courant électrique traversant le moteur 10. En outre l'indication de charge de linge est plus précise qu'avec les dispositions décrites dans ledit brevet européen mentionné ci-dessus car le calcul effectué permet d'éliminer le facteur CR en toute rigueur. Il n'est bien entendu pas indispensable que la seconde rampe 21 suive immédiatement la première rampe 20 comme représenté sur la figure 3; il est possible de séparer la fin de la première rampe du début de la seconde rampe.Whatever the embodiment, the washing machine according to the invention is of a particularly simple embodiment since it does not require any particular means of measuring the intensity of the electric current passing through the motor 10. In addition, the indication of load of linen is more precise than with the provisions described in said European patent mentioned above because the calculation carried out makes it possible to eliminate the factor C R in all rigor. It is of course not essential that the second ramp 21 immediately follow the first ramp 20 as shown in Figure 3; it is possible to separate the end of the first ramp from the start of the second ramp.

On va maintenant décrire en relation avec les figures 4 et 5 un autre mode de réalisation de l'invention qui permet aussi une mesure plus précise de la charge de linge grâce à l'élimination du facteur CR. Il se distingue de la réalisation précédemment décrite par le fait que la mesure fait intervenir l'intensité du courant électrique traversant le moteur au lieu de l'angle de phase.We will now describe in relation to FIGS. 4 and 5 another embodiment of the invention which also allows a more precise measurement of the laundry load thanks to the elimination of the factor C R. He distinguishes himself of the embodiment previously described by the fact that the measurement involves the intensity of the electric current passing through the motor instead of the phase angle.

Des formules (1) et (2) ci-dessus ont déduit :

Figure imgb0020
Formulas (1) and (2) above deduced:
Figure imgb0020

Dans cette relation (20) ci-dessus 1 est mesurable, par exemple en disposant une résistance en série avec le moteur et en déterminant la tension aux bornes de cette résistance, J et K sont des constantes, ω est mesurable, par exemple, à l'aide d'une génératrice tachymétrique et dω In this relation (20) above 1 is measurable, for example by arranging a resistance in series with the motor and by determining the voltage across this resistance, J and K are constants, ω is measurable, for example, at using a tachometer generator and d ω

est calculé à partir de ω . Le calcul s'effectue dans l'exemple à l'aide d'un microprocesseur.is calculated from ω. The calculation is carried out in the example using a microprocessor.

Par contre, comme déjà indiqué, le couple résistant CR ne peut être aisément mesuré directement. C'est pourquoi on prévoit selon l'invention une commande qui permet d'éliminer ce paramètre CR. A cet effet :On the other hand, as already indicated, the resisting torque C R cannot be easily measured directly. This is why a command is provided according to the invention which makes it possible to eliminate this parameter C R. To this end:

Avant d'introduire de l'eau dans la machine on fait tourner le moteur d'entraînement du tambour à une vitesse V correspondant par exemple à 200 tours/minute pour le tambour, puis à partir de l'instant t1 (figure 4) on augmente cette vitesse à accélération constante jusqu'à une vitesse V2, par exemple correspondant à une vitesse de rotation de 400 tours/minute environ pour le tambour. La durée de cette rampe de montée en vitesse est A ti , entre les instants ti et t2,c'est-à-dire 4 secondes environ dans l'exemple.Before introducing water into the machine, the drum drive motor is rotated at a speed V corresponding for example to 200 revolutions / minute for the drum, then from time t 1 (FIG. 4) this constant acceleration speed is increased to a speed V 2 , for example corresponding to a rotation speed of around 400 revolutions / minute for the drum. The duration of this ramp up is A ti, between the instants ti and t 2 , that is to say approximately 4 seconds in the example.

Ensuite on ramène la vitesse de rotation du moteur à la valeur Vi puis on recommence, à l'instant t3, l'accélération du tambour avec une accélération différente, quatre fois plus petite dans l'exemple. On arrête, à l'instant t4, cette seconde accélération lorsque la vitesse du moteur atteint la valeur V2. La durée de cette rampe est A t2. Etant donné que l'accélération est quatre fois inférieure on peut écrire :

Figure imgb0021
Then the motor speed is reduced to the value Vi and then the acceleration of the drum is started again at time t 3 with a different acceleration, four times smaller in the example. This second acceleration is stopped at time t 4 when the engine speed reaches the value V 2 . The duration of this ramp is A t 2 . Since the acceleration is four times lower we can write:
Figure imgb0021

La variation de l'intensité I du courant traversant le moteur universel, entraînant le tambour est représentée sur la figure 5.The variation of the intensity I of the current passing through the universal motor, driving the drum is shown in FIG. 5.

Au cours de la première période de durée A ti, on détermine, à l'aide dudit microprocesseur, périodiquement, toutes les vingt millisecondes (c'est-à-dire à la fréquence de 50 Hz) dans l'exemple, l'intensité I du courant traversant le moteur et ces intensités sont mises en mémoire. Le microprocesseur détermine aussi la somme, notées 11, de toutes ces intensités li.During the first period of duration A ti, using said microprocessor, periodically, every twenty milliseconds (that is to say at the frequency of 50 Hz) is determined in the example, the intensity I of the current passing through the motor and these intensities are stored in memory. The microprocessor also determines the sum, denoted 1 1 , of all these intensities li.

Au cours de la seconde rampe de durée A t2 on détermine toutes les 80 millisecondes (quatre fois vingt millisecondes) l'intensité 12 du courant traversant le moteur et, comme pour la première rampe, on effectue la somme E 12 de toutes ces intensités que l'on met en mémoire.During the second ramp of duration A t 2, the intensity 1 2 of the current passing through the motor is determined every 80 milliseconds (four times twenty milliseconds) and, as for the first ramp, the sum E 1 2 of all these intensities that we put in memory.

Ensuite on effectue la différence entre ces deux sommes soit :

Figure imgb0022
Then we make the difference between these two sums either:
Figure imgb0022

Cette différence D est proportionnelle à L + J, c'est-à-dire représente la charge de linge dans la tambour. En effet:

  • Lorsque la vitesse de rotation du moteur a la valeur Vi au cours de la première rampe, la relation (20) ci-dessus s'écrit :
    Figure imgb0023
This difference D is proportional to L + J, that is to say represents the load of laundry in the drum. Indeed:
  • When the speed of rotation of the motor has the value Vi during the first ramp, the relation (20) above is written:
    Figure imgb0023

Dans cette formule :

Figure imgb0024
In this formula:
Figure imgb0024

Lorsque la vitesse de rotation du moteur a la même valeur Vi au cours de la seconde rampe, la relation (20) s'écrit encore :

Figure imgb0025
Dans cette formule :
Figure imgb0026
 When the engine speed has the same value V i during the second ramp, the relation (20) is still written:
Figure imgb0025
 In this formula:
Figure imgb0026

Si on effectue la différence membre à membre entre les relations (23) et (25) ci-dessus on obtient :

Figure imgb0027
If we make the member-to-member difference between relations (23) and (25) above we obtain:
Figure imgb0027

On observera que dans les formules (23) et (25) les termes

Figure imgb0028
Ri s'éliminent en toute rigueur car ces formules correspondent aux mêmes vitesses de rotation, donc aux mêmes valeurs CR; de couple résistant. Le nombre n de mesures de l'intensité I, ou nombre n d'échantillonnages, étant le même pour les deux rampes d'accélération on peut écrire :
Figure imgb0029
 It will be observed that in the formulas (23) and (25) the terms
Figure imgb0028
 R i are eliminated in all rigor because these formulas correspond to the same rotational speeds, therefore to the same values C R ; of resistant torque. The number n of measurements of intensity I, or number n of samplings, being the same for the two acceleration ramps, we can write:
Figure imgb0029

On voit donc que la différence D = Σl1 - E 12 est bien proportionnelle à L + J.We therefore see that the difference D = Σl 1 - E 1 2 is indeed proportional to L + J.

En variante la période d'échantillonnage est la même au cours de la seconde rampe, c'est-à-dire que dans l'exemple le nombre d'échantillons est quatre fois supérieur pour la seconde rampe que pour la première . Dans ce cas il faut diviser la somme des valeurs de 12 par quatre pour obtenir la grandeur D proportionnelle à L + J, c'est-à-dire que le microprocesseur calcule la grandeur D telle que :

Figure imgb0030
As a variant, the sampling period is the same during the second ramp, that is to say that in the example the number of samples is four times greater for the second ramp than for the first. In this case it is necessary to divide the sum of the values of 1 2 by four to obtain the quantity D proportional to L + J, that is to say that the microprocessor calculates the quantity D such that:
Figure imgb0030

De façon générale si on veut le même nombre n d'échantillons au cours des deux rampes il faut que la période d'échantillonnage au cours de la seconde rampe soit À fois plus importante qu'au cours de la première rampe, λ étant le rapport entre la première et la seconde accélération. Si la période d'échantillonnage et la même pour les deux rampes il faudra alors affecter à la somme des intensités 1 pour la seconde rampe un facteur de division égal à ce même rapport entre la première et la seconde accélération.Generally if the same number n of samples is desired during the two ramps, the sampling period during the second ramp must be fois times greater than during the first ramp, λ being the ratio between the first and second acceleration. If the sampling period is the same for the two ramps then it will be necessary to assign to the sum of the intensities 1 for the second ramp a division factor equal to this same ratio between the first and the second acceleration.

La formule (27) ci-dessus montre qu'il n'est pas indispensable d'effectuer une somme d'échantillons au cours de chaque rampe. Il suffit de mesurer l'intensité du courant pour une vitesse Vi déterminée au cours de la première rampe, de mesurer l'intensité du courant au cours de la seconde rampe pour la même vitesse Vi et d'effectuer la différence entre ces deux intensités pour obtenir une grandeur proportionnelle à L + J. La charge de linge peut être déterminée non seulement avant toute introduction d'eau dans le lave-linge mais également à d'autres instants du fonctionnement de la machine.The formula (27) above shows that it is not essential to carry out a sum of samples during each ramp. It suffices to measure the intensity of the current for a speed V i determined during the first ramp, to measure the intensity of the current during the second ramp for the same speed Vi and to make the difference between these two intensities to obtain a quantity proportional to L + J. The laundry load can be determined not only before any water is introduced into the washing machine, but also at other times during the operation of the machine.

L'invention s'applique aussi à un sèche-linge.The invention also applies to a dryer.

Claims (18)

1. Lave-linge ou sèche-linge comprenant, pour déterminer la charge du linge dans le tambour, un moyen de mesure du moment d'inertie (L) du linge par rapport à l'axe de rotation de ce tambour, cette mesure étant obtenue en faisant tourner le tambour à accélération de préférence constante, caractérisé en ce qu'on fait tourner le tambour successivement (20,21) suivant deux valeurs différentes d'accélérations, et en ce que le moment d'inertie est déterminé à partir d'une différence entre, d'une part, une mesure réalisée lors de la première accélération et, d'autre part, une mesure réalisée lors de la seconde accélération.1. Washing machine or dryer comprising, for determining the load of the laundry in the drum, a means of measuring the moment of inertia (L) of the laundry with respect to the axis of rotation of this drum, this measurement being obtained by rotating the drum at preferably constant acceleration, characterized in that the drum is rotated successively (20,21) according to two different values of acceleration, and in that the moment of inertia is determined from a difference between, on the one hand, a measurement carried out during the first acceleration and, on the other hand, a measurement carried out during the second acceleration. 2. Lave-linge ou sèche-linge selon la revendication 1, caractérisé en ce que le moteur (10) d'entraînement du tambour étant du type universel, alimenté en courant alternatif (11), sa vitesse est déterminée par une commande à contrôle de phase grâce à un processeur, notamment un microprocesseur (13), et en ce que ce processeur détermine le moment d'inertie à partir de la valeur (0) de l'angle de phase.2. Washing machine or dryer according to claim 1, characterized in that the motor (10) for driving the drum being of the universal type, supplied with alternating current (11), its speed is determined by a control command phase thanks to a processor, in particular a microprocessor (13), and in that this processor determines the moment of inertia from the value (0) of the phase angle. 3. Lave-linge ou sèche-linge selon la revendication 2, caractérisé en ce que le processeur (13) commande la rotation du moteur (10) d'entraînement du tambour d'une première vitesse (Vi) à une seconde vitesse (V2) avec une première accélération, détermine périodiquement, pendant cette première accélération, les valeurs (01) de l'angle de phase et en effectue la somme (Σθ1), puis commande une seconde rampe d'accélération de la vitesse du moteur (10) entre lesdites première et seconde vitesses, avec une accélération différente, l'angle de phase (02) étant également déterminé périodiquement et sommé (Σθ2), le microprocesseur déterminant ensuite la différence entre les deux sommes qui représente le moment d'inertie du linge dans le tambour.3. Washing machine or dryer according to claim 2, characterized in that the processor (13) controls the rotation of the motor (10) driving the drum from a first speed (Vi) to a second speed (V 2 ) with a first acceleration, periodically determines, during this first acceleration, the values (0 1 ) of the phase angle and performs the sum (Σθ 1 ), then controls a second ramp of acceleration of the motor speed (10) between said first and second speeds, with an acceleration different, the phase angle (0 2 ) being also determined periodically and summed (Σθ 2 ), the microprocessor then determining the difference between the two sums which represents the moment of inertia of the laundry in the drum. 4. Lave-linge ou sèche-linge selon la revendication 3, caractérisé en ce que la période de détermination des angles de phase (02) au cours de la seconde accélération est égale au produit de la période de détermination des angles de phase (θ1) au cours de la première accélération par le rapport At2/ Δt1 entre la première et la seconde accélération.4. Washing machine or dryer according to claim 3, characterized in that the phase angle determination period (0 2 ) during the second acceleration is equal to the product of the phase angle determination period ( θ 1 ) during the first acceleration by the ratio At 2 / Δt 1 between the first and the second acceleration. 5. Lave-linge ou sèche-linge selon la revendication 3, caractérisé en ce que les périodes de détermination des angles de phase (θ1, 02) sont les mêmes au cours des première et seconde accélérations, et en ce que la charge de linge est représentée par la grandeur suivante :
Figure imgb0031
λ étant le rapport entre la première et la seconde accélération.5. Washing machine or dryer according to claim 3, characterized in that the periods for determining the phase angles (θ 1 , 0 2 ) are the same during the first and second accelerations, and in that the load of laundry is represented by the following quantity:
Figure imgb0031
 λ being the ratio between the first and the second acceleration. 6. Lave-linge ou sèche-linge selon l'une quelconque des revendications 3 à 5, caractérisé en ce que la première vitesse (V1) correspond à une vitesse de rotation du tambour de l'ordre de 200 tours/minute et la seconde vitesse (V2) correspond à une vitesse de rotation du tambour de l'ordre de 400 tours/minute.6. Washing machine or dryer according to any one of claims 3 to 5, characterized in that the first speed (V 1 ) corresponds to a rotation speed of the drum of the order of 200 revolutions / minute and the second speed (V 2 ) corresponds to a drum rotation speed of the order of 400 revolutions / minute. 7. Lave-linge ou sèche-linge selon l'une quelconque des revendications 2 à 6, caractérisé en ce qu'il comporte une génératrice tachymétrique (15) entraînée par le moteur universel (10), cette génératrice tachymétrique étant reliée à une entrée (131) du processeur (13) pour réguler la vitesse du moteur (10) en fonction du programme en mémoire du processeur.7. Washing machine or dryer according to any one of claims 2 to 6, characterized in that it comprises a tachometer generator (15) driven by the universal motor (10), this tachometer generator being connected to an input (13 1 ) of the processor (13) to regulate the speed of the motor (10) according to the program in memory of the processor. 8. Lave-linge ou sèche-linge selon la revendication 7, caractérisé en ce que le processeur (13) détermine le moment d'inertie (L) à partir de l'angle ( θ) grâce à la relation suivante :
Figure imgb0032
Vs étant l'amplitude maximum du signal alternatif d'alimentation du moteur (10), K, Ki et K' des constantes, R la résistance électrique du moteur, CR le couple résistant opposé par le tambour, d /dt l'accélération du tambour et J le moment d'inertie du tambour proprement dit.8. Washing machine or dryer according to claim 7, characterized in that the processor (13) determines the moment of inertia (L) from the angle (θ) by the following relation:
Figure imgb0032
 V s being the maximum amplitude of the AC motor supply signal (10), K, Ki and K 'of the constants, R the electric resistance of the motor, C R the resistance torque opposed by the drum, d / dt l acceleration of the drum and J the moment of inertia of the drum itself. 9. Lave-linge ou sèche-linge selon la revendication 1, caractérisé en ce que le tambour étant entraîné par un moteur électrique universel, on fait tourner le tambour successivement suivant deux valeurs différentes (
Figure imgb0033
,
Figure imgb0034
) d'accélérations, de préférence constantes, et en ce que le moment d'inertie est déterminé à partir d'une différence entre, d'une part, une mesure d'intensité du courant traversant le moteur réalisé lors de la première accélération et, d'autre part, une mesure d'intensité de ce courant traversant le moteur lors de la seconde accélération.9. Washing machine or dryer according to claim 1, characterized in that the drum being driven by a universal electric motor, the drum is rotated successively according to two different values (
Figure imgb0033
 ,
Figure imgb0034
 ) accelerations, preferably constant, and in that the moment of inertia is determined from a difference between, on the one hand, a measurement of the intensity of the current flowing through the motor produced during the first acceleration and , on the other hand, a measurement of the intensity of this current passing through the motor during the second acceleration. 10. Lave-linge ou sèche-linge selon la revendication 9, caractérisé en ce que les mesures réalisées lors des deux accélérations sont effecutées à la même vitesse Vi de rotation du tambour.10. Washing machine or dryer according to claim 9, characterized in that the measurements made during the two accelerations are carried out at the same speed V i of rotation of the drum. 11. Lave-linge ou sèche-linge selon la revendication 9 ou 10, caractérisé en ce qu'un processeur détermine périodiquement pendant la première accélération les intensités l1 du courant traversant le moteur et en effectue la somme et en ce que, lors de la seconde accélération, l'intensité du courant 12 traversant le moteur est également déterminée périodiquement, ladite différence étant la différence entre les deux sommes.11. Washing machine or dryer according to claim 9 or 10, characterized in that a processor periodically determines during the first acceleration the intensities l 1 of the current passing through the motor and performs the sum thereof and in that, during the second acceleration, the intensity of the current 1 2 passing through the motor is also determined periodically, said difference being the difference between the two sums. 12. Lave-linge ou sèche-linge selon la revendication 11, caractérisé en ce que la période de détermination des intensités de courant 12 au cours de la seconde accélération est égale au produit de la période de détermination des intensités de courant l1 au cours de la première accélération par le rapport Δt2) entre la première et la seconde accélération.12. Washing machine or dryer according to claim 11, characterized in that the period for determining the current intensities 1 2 during the second acceleration is equal to the product of the period for determining the current intensities l 1 to during the first acceleration by the ratio Δt2) between the first and the second acceleration. 13. Lave-linge ou sèche-linge selon la revendication 11, caractérisé en ce que les périodes de détermination des intensités de courant ( 11, 12 ) sont les mêmes au cours des première et seconde accélérations et en ce que la charge de linge est représentée par la grandeur suivante :
Figure imgb0035
λ , étant le rapport entre la première et la seconde accélération.13. Washing machine or dryer according to claim 11, characterized in that the periods for determining the current intensities (1 1 , 1 2 ) are the same during the first and second accelerations and in that the load of laundry is represented by the following quantity:
Figure imgb0035
 λ, being the ratio between the first and the second acceleration. 14. Lave-linge ou sèche-linge selon l'une quelconque des revendications précédentes 9 à 13, caractérisé en ce que la première vitesse (V1) correspond à une vitesse de rotation du tambour de l'ordre de 200 tours par minute et la seconde vitesse ( V2) correspond à une vitesse de rotation du tambour de l'ordre de 400 tours par minute.14. Washing machine or dryer according to any one of the preceding claims 9 to 13, characterized in that the first speed (V 1 ) corresponds to a rotation speed of the drum of the order of 200 revolutions per minute and the second speed (V 2 ) corresponds to a rotation speed of the drum of the order of 400 revolutions per minute. 15. Lave-linge ou sèche-linge comprenant, pour déterminer la charge de linge dans le tambour, un moyen de détermination du moment d'inertie (L) du linge par rapport à l'axe de rotation de ce tambour, le moteur (10) d'entraînement du tambour étant du type universel, caractérisé en ce que le moteur universel15. A washing machine or dryer comprising, for determining the load of laundry in the drum, a means of determining the moment of inertia (L) of the laundry with respect to the axis of rotation of this drum, the motor ( 10) drum drive being of the universal type, characterized in that the universal motor (10) étant alimenté en courant alternatif (11) et sa vitesse étant déterminée par une commande à contrôle de phase grâce à un processeur, notamment un microprocesseur (13), ce processeur détermine ledit moment d'inertie à partie de la valeur (0) de l'angle de phase.(10) being supplied with alternating current (11) and its speed being determined by a phase control command using a processor, in particular a microprocessor (13), this processor determines said moment of inertia from the value (0 ) of the phase angle. 16. Lave-linge ou sèche-linge selon la revendication 15, caractérisé en ce qu'il comporte une génératrice tachymétrique (15) entraînée par le moteur universel (10), cette génératrice tachymétrique étant reliée à une entrée (131) du processeur (13) pour réguler la vitesse du moteur (10) en fonction du programme en mémoire du processeur.16. Washing machine or dryer according to claim 15, characterized in that it comprises a tachometer generator (15) driven by the universal motor (10), this tachometer generator being connected to an input (13 1 ) of the processor (13) to regulate the speed of the motor (10) according to the program in memory of the processor. 17. Lave-linge ou sèche-linge selon la revendication 16, caractérisé en ce que le processeur (13) détermine le moment d'inertie (L) à partir de l'angle ( 8 ) grâce à la relation suivante :
Figure imgb0036
Vs étant l'amplitude maximum du signal alternatif d'alimentation du moteur (10), K, Ki et K' des constantes, R la résistance électrique du moteur, CR le couple résistant opposé par le tambour, dw/dt l'accélération du tambour et J le moment d'inertie du tambour proprement dit.17. Washing machine or dryer according to claim 16, characterized in that the processor (13) determines the moment of inertia (L) from the angle (8) by the following relation:
Figure imgb0036
 Vs being the maximum amplitude of the AC motor supply signal (10), K, Ki and K 'of the constants, R the electric resistance of the motor, C R the resistance torque opposed by the drum, dw / dt the acceleration of the drum and J the moment of inertia of the drum itself.
EP89401403A 1988-05-31 1989-05-23 Washing machine or dryer with means for automatically determining the weight of the laundry Expired - Lifetime EP0345120B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89401403T ATE85370T1 (en) 1988-05-31 1989-05-23 WASHING MACHINE OR DRYER WITH AUTOMATIC MEASURING OF THE WEIGHT OF THE LAUNDRY.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8807216A FR2631988B1 (en) 1988-05-31 1988-05-31 IMPROVEMENTS IN A WASHING MACHINE OR DRYER WITH AUTOMATIC DETERMINATION OF THE LOAD OF LAUNDRY INSERTED IN THE MACHINE
FR8807216 1988-05-31
FR888811908A FR2636354B2 (en) 1988-05-31 1988-09-13 IMPROVEMENTS IN A WASHING MACHINE OR DRYER WITH AUTOMATIC DETERMINATION OF THE LOAD OF LAUNDRY INSERTED IN THE MACHINE
FR8811908 1988-09-13

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EP0345120A1 true EP0345120A1 (en) 1989-12-06
EP0345120B1 EP0345120B1 (en) 1993-02-03

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US5161393A (en) * 1991-06-28 1992-11-10 General Electric Company Electronic washer control including automatic load size determination, fabric blend determination and adjustable washer means
US5208931A (en) * 1989-08-30 1993-05-11 Fisher & Paykel Limited Laudry machines and/or methods of controlling the same
US5271116A (en) * 1989-08-30 1993-12-21 Fisher & Paykel Limited Laundry machines and/or methods of controlling the same
US5325677A (en) * 1992-08-27 1994-07-05 General Electric Company Electronic washer control including automatic balance, spin and brake operations
EP0649930A1 (en) * 1993-10-25 1995-04-26 Bosch-Siemens HausgerÀ¤te GmbH Method for determining the laundry quantity in a laundry treatment machine
US5507054A (en) * 1993-10-25 1996-04-16 Bosch-Siemens Hausgeraete Gmbh Method for determining the mass of wet laundry in a laundry drum
US5519835A (en) * 1990-12-20 1996-05-21 Fujitsu Limited Method and apparatus for controlling the flow of data transmissions by generating a succession of ready signals to a high-performance parallel interface(HIPPI) terminal connected to a broadband integrated services digital network (B-ISDN)
WO1996029457A1 (en) * 1995-03-20 1996-09-26 General Electric Company Energy efficient washer with inertia based method for determining load
GB2327502A (en) * 1997-07-14 1999-01-27 Lg Electronics Inc Determining the amount of laundry present in a drum washing machine
US6038724A (en) * 1998-11-27 2000-03-21 General Electric Company Clothes load estimation method and washing machine
US6122840A (en) * 1998-11-18 2000-09-26 General Electric Company Systems and methods for determining drying time for a clothes dryer
EP1512785A1 (en) * 2003-09-04 2005-03-09 Lg Electronics Inc. Method for sensing amount of laundry of washing machine
EP2221412A1 (en) * 2009-02-24 2010-08-25 BSH Bosch und Siemens Hausgeräte GmbH Method for monitoring a load in a laundry drum and/or a drying level of laundry items and corresponding switching assembly
US20110023602A1 (en) * 2008-03-31 2011-02-03 Electrolux Home Products Corporation N.V. Method for Estimating the Moment of Inertia of the Rotating Unit of a Washing Machine, and Washing Machine Implementing Said Method
US20140096327A1 (en) * 2012-10-09 2014-04-10 Lg Electronics Inc. Laundry treatment machine and method of operating the same
EA021502B1 (en) * 2009-06-17 2015-07-30 Грандимпьянти Иле Али С.П.А. Method for weighing laundry inside a basket-type washing machine
US9945060B2 (en) 2012-01-19 2018-04-17 Whirlpool Corporation Method to determine fabric type in a laundry treating appliance using motor current signature during agitation

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US9080277B2 (en) 2011-12-22 2015-07-14 Whirlpool Corporation Apparatus and method for determining inertia of a laundry load
US9091012B2 (en) 2011-12-22 2015-07-28 Whirlpool Corporation Method and apparatus for determining an inertia of a laundry load in a laundry treating appliance

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Cited By (23)

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Publication number Priority date Publication date Assignee Title
US5208931A (en) * 1989-08-30 1993-05-11 Fisher & Paykel Limited Laudry machines and/or methods of controlling the same
US5271116A (en) * 1989-08-30 1993-12-21 Fisher & Paykel Limited Laundry machines and/or methods of controlling the same
US5519835A (en) * 1990-12-20 1996-05-21 Fujitsu Limited Method and apparatus for controlling the flow of data transmissions by generating a succession of ready signals to a high-performance parallel interface(HIPPI) terminal connected to a broadband integrated services digital network (B-ISDN)
US5710942A (en) * 1990-12-20 1998-01-20 Fujitsu Limited Adapter monitoring storage capacity of its buffer and sequentially generating ready signals to notify a terminal to transfer more burst data to the buffer
US5161393A (en) * 1991-06-28 1992-11-10 General Electric Company Electronic washer control including automatic load size determination, fabric blend determination and adjustable washer means
US5325677A (en) * 1992-08-27 1994-07-05 General Electric Company Electronic washer control including automatic balance, spin and brake operations
US5507054A (en) * 1993-10-25 1996-04-16 Bosch-Siemens Hausgeraete Gmbh Method for determining the mass of wet laundry in a laundry drum
EP0649930A1 (en) * 1993-10-25 1995-04-26 Bosch-Siemens HausgerÀ¤te GmbH Method for determining the laundry quantity in a laundry treatment machine
CN1079461C (en) * 1993-10-25 2002-02-20 Bsh博施及西门子家用器具有限公司 Method for determination of amount of washed products in washed products treating machine
CN1070953C (en) * 1993-10-25 2001-09-12 Bsh博施及西门子家用器具有限公司 Method for determing quality of washed objects in receptacle of washing machine
WO1996029457A1 (en) * 1995-03-20 1996-09-26 General Electric Company Energy efficient washer with inertia based method for determining load
GB2327502A (en) * 1997-07-14 1999-01-27 Lg Electronics Inc Determining the amount of laundry present in a drum washing machine
GB2327502B (en) * 1997-07-14 2001-10-17 Lg Electronics Inc Method for detecting clothing amount in drum washing machine
US6122840A (en) * 1998-11-18 2000-09-26 General Electric Company Systems and methods for determining drying time for a clothes dryer
US6038724A (en) * 1998-11-27 2000-03-21 General Electric Company Clothes load estimation method and washing machine
EP1512785A1 (en) * 2003-09-04 2005-03-09 Lg Electronics Inc. Method for sensing amount of laundry of washing machine
US20110023602A1 (en) * 2008-03-31 2011-02-03 Electrolux Home Products Corporation N.V. Method for Estimating the Moment of Inertia of the Rotating Unit of a Washing Machine, and Washing Machine Implementing Said Method
US8336378B2 (en) * 2008-03-31 2012-12-25 Electrolux Home Products Corporation N.V. Method for estimating the moment of inertia of the rotating unit of a washing machine, and washing machine implementing said method
EP2221412A1 (en) * 2009-02-24 2010-08-25 BSH Bosch und Siemens Hausgeräte GmbH Method for monitoring a load in a laundry drum and/or a drying level of laundry items and corresponding switching assembly
EA021502B1 (en) * 2009-06-17 2015-07-30 Грандимпьянти Иле Али С.П.А. Method for weighing laundry inside a basket-type washing machine
US9945060B2 (en) 2012-01-19 2018-04-17 Whirlpool Corporation Method to determine fabric type in a laundry treating appliance using motor current signature during agitation
US20140096327A1 (en) * 2012-10-09 2014-04-10 Lg Electronics Inc. Laundry treatment machine and method of operating the same
US9809923B2 (en) * 2012-10-09 2017-11-07 Lg Electronics Inc. Laundry treatment machine and method of operating the same

Also Published As

Publication number Publication date
DE68904699T2 (en) 1993-05-27
DE68904699D1 (en) 1993-03-18
FR2636354B2 (en) 1991-07-05
EP0345120B1 (en) 1993-02-03
FR2636354A2 (en) 1990-03-16

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