EP1925708A1 - Verfahren zur Bestimmung des Gewichts der Wäsche und Waschmaschine zur Durchführung des Verfahrens - Google Patents

Verfahren zur Bestimmung des Gewichts der Wäsche und Waschmaschine zur Durchführung des Verfahrens Download PDF

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Publication number
EP1925708A1
EP1925708A1 EP06124604A EP06124604A EP1925708A1 EP 1925708 A1 EP1925708 A1 EP 1925708A1 EP 06124604 A EP06124604 A EP 06124604A EP 06124604 A EP06124604 A EP 06124604A EP 1925708 A1 EP1925708 A1 EP 1925708A1
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EP
European Patent Office
Prior art keywords
drum
value
laundry
length
connecting member
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.)
Granted
Application number
EP06124604A
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English (en)
French (fr)
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EP1925708B1 (de
Inventor
Oleg Potantsev
Sergey Argudyaev
Sergey Leonenkov
Stefano Casagrande
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.)
Electrolux Home Products Corp NV
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Electrolux Home Products Corp NV
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Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to AT06124604T priority Critical patent/ATE431453T1/de
Priority to DE602006006849T priority patent/DE602006006849D1/de
Priority to PL06124604T priority patent/PL1925708T3/pl
Priority to EP06124604A priority patent/EP1925708B1/de
Priority to ES06124604T priority patent/ES2325177T3/es
Priority to RU2007143174/12A priority patent/RU2418118C2/ru
Publication of EP1925708A1 publication Critical patent/EP1925708A1/de
Application granted granted Critical
Publication of EP1925708B1 publication Critical patent/EP1925708B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/18—Condition of the laundry, e.g. nature or weight

Definitions

  • the present invention relates to a method of determining the laundry weight inside a washing machine drum, and to a washing machine implementing such a method.
  • the present invention relates to a method of determining the laundry weight inside the drum of a rotary-drum household washing machine, to which the following description refers purely by way of example.
  • washing machines are frequently operated with only a partial load, i.e. to wash a smaller amount of laundry than the maximum amount for which the machine is designed, with all the disadvantages this entails in terms of water, detergent, and electricity consumption, in that washing machine wash cycles are traditionally optimized with a view to full-load operation of the machine.
  • washing machine models are designed to optimize the wash cycle as a function of the actual load. In some of these models, this even goes so far as to meter the water and detergent as a function of the amount and characteristics of the laundry in the washing machine drum, with obvious advantages in terms of reducing water, detergent, and electricity consumption per wash cycle.
  • most recently marketed washing machine models determine the laundry weight inside the drum on the basis of the time taken by the loaded drum to stop on its own, after being rotated at a reference angular speed.
  • the time taken by the drum to stop in fact, is a function of the kinetic energy accumulated by the loaded drum, and therefore of the weight of the laundry inside the drum.
  • the central control unit Given the impossibility of determining the amount of energy dissipated by the suspensions connecting the wash assembly to the machine frame, the central control unit is obviously forced to overestimate the amount of laundry in the drum to ensure a successful wash cycle even if the laundry is distributed unevenly inside the drum.
  • washing machine as claimed in Claim 8 and preferably, though not necessarily, any one of the Claims depending directly or indirectly on Claim 8.
  • Number 1 in Figure 1 indicates as a whole a washing machine, which is particularly advantageous for home use, and substantially comprises a supporting frame 2 resting on the floor; a preferably, though not necessarily, cylindrical wash tub 3 suspended in floating manner inside frame 2 by means of a number of coil springs 4 (only one shown in Figure 1) preferably, though not necessarily, combined with one or more known shock-absorbers 5; a rotary drum 6 housed in axially rotating manner inside wash tub 3; and a drive unit 7 connected mechanically to drum 6 to rotate it about the longitudinal axis A of the drum inside wash tub 3.
  • Wash tub 3, drum 6, and the other component parts of washing machine 1 suspended from frame 2 by coil springs 4 form the wash assembly of the washing machine.
  • washing machine 1 also comprises a laundry weight detecting device 8 for determining the weight of the laundry currently inside drum 6, and for communicating the weight value to the electronic central control unit 9 of washing machine 1, which in turn optimizes the wash cycle parameters in known manner as a function of the actual weight of the laundry inside drum 6.
  • detecting device 8 determines, instant by instant, the value of length H of at least one of the coil springs 4 suspending wash tub 3 - hereinafter also referred to as the reference coil spring 4 - as drum 6 is rotated about longitudinal axis A at a preferably, though not necessarily, constant angular speed ⁇ 0 ; and then determines the actual weight of the laundry inside drum 6 by extrapolating said value from the time pattern H(t) of length H of reference coil spring 4 ( Figure 3) over a predetermined control time interval ⁇ T as drum 6 rotates at angular speed ⁇ 0 .
  • detecting device 8 statistically determines the mean value H m of length H of reference coil spring 4 over the time interval ⁇ T in which drum 6 rotates at angular speed ⁇ 0 ; and then determines the total weight of the wash assembly, i.e. also including the laundry inside drum 6, weighing on coil springs 4, on the basis of the mean value H m of length H of reference coil spring 4, the weight distribution of the wash assembly between the coil springs 4 supporting wash tub 3, and the mechanical characteristics of reference coil spring 4.
  • detecting device 8 extrapolates the total weight m tot of the laundry currently inside drum 6, by subtracting the "no-load" weight of the wash assembly, i.e. the weight of the wash assembly with no laundry inside drum 6, from the total weight of the wash assembly deduced from the mean value H m of length H of reference coil spring 4.
  • the "no-load" weight of the wash assembly is specific structural parameters of washing machine 1 that can be determined easily at the machine design stage.
  • Detecting device 8 preferably, though not necessarily, also processes the time pattern H(t) of length H of reference coil spring 4 ( Figure 3) over time interval ⁇ T to statistically determine the value of the deviation ⁇ H in the time pattern H(t) of length H of coil spring 4 over time interval ⁇ T; extrapolates from the value of deviation ⁇ H in the time pattern H(t) of length H of reference coil spring 4 a coefficient of unbalance indicating the degree of unbalance of the laundry currently inside drum 6; and, finally, transmits the coefficient of unbalance to electronic central control unit 9 of washing machine 1.
  • the laundry in drum 6 can be divided into two distinct masses : one distributed evenly inside drum 6, and the other concentrated at one point on the lateral wall of drum 6 and responsible for the vibration absorbed by coil springs 4 and shock-absorbers 5.
  • detecting device 8 extrapolates the weight m' of the laundry mass theoretically concentrated at one point on the lateral wall of drum 6 on the basis of the value of deviation ⁇ H in the time pattern H(t) of length H of reference coil spring 4, the weight distribution of the wash assembly between the coil springs 4 supporting wash tub 3, and the mechanical characteristics of reference coil spring 4.
  • the laundry mass theoretically concentrated at one point on the lateral wall of drum 6 produces mechanical vibration, which is absorbed by coil springs 4 and shock-absorbers 5, and which results in continual variations in the length of the coil springs 4, including reference coil spring 4, supporting the wash assembly.
  • detecting device 8 also determines the weight m" of the laundry mass distributed evenly inside drum 6 as the difference between the total weight m tot of the laundry in drum 6, and the weight m' of the laundry mass concentrated on the lateral wall of drum 6.
  • detecting device 8 indirectly determines the instantaneous value of length H of reference coil spring 4 by exploiting the fact that the body of coil spring 4 is made of metal and so constitutes a coil 4 of electrically conducting material, which has an inductance L of an instantaneous value mathematically correlated to the instantaneous value of length H of coil 4 of electrically conducting material, i.e. of coil spring 4.
  • detecting device 8 indirectly determines the instantaneous value of length H of reference coil spring 4 by continuous measurement of the frequency f of the electric signal generated by an LC oscillating circuit, in which the inductance of the LC oscillating circuit which contributes in determining the value of the natural oscillation frequency f of the electric signal is defined by reference coil spring 4.
  • detecting device 8 comprises an LC oscillating circuit 10 incorporating reference coil spring 4 as an inductor, and which generates an electric signal having a natural oscillation frequency f ( Figure 4) which is mathematically correlated to the constant capacitance value of the standard capacitor integrated in LC oscillating circuit 10, and to the time-variable value of inductance L of reference coil spring 4.
  • reference coil spring 4 is electrically insulated from wash tub 3 and frame 2, and is connected parallel to the standard capacitor of LC oscillating circuit 10 by two known electric leads 11, so as to be incorporated in LC oscillating circuit 10; and detecting device 8 also comprises a signal processing unit 12, which processes the electric signal from LC oscillating circuit 10 to determine the total weight m tot of the laundry in drum 6, and to communicate the total weight value to electronic central control unit 9 of washing machine 1.
  • Signal processing unit 12 preferably, though not necessarily, also processes the electric signal from LC oscillating circuit 10 to determine the weight m' of the laundry mass theoretically concentrated on the lateral wall of drum 6, and the weight m" of the laundry mass theoretically distributed evenly inside drum 6.
  • C is the capacitance value of the standard capacitor
  • r is the outside radius of the turns of reference coil spring 4
  • N is the number of turns of reference coil spring 4
  • H is the instantaneous value of the length of reference coil spring 4.
  • H ⁇ ⁇ f 2 - ⁇
  • ⁇ and ⁇ are two constants that can be determined empirically and which depend on the structure of reference coil spring 4
  • f is the instantaneous frequency value of the electric signal from LC oscillating circuit 10.
  • Signal processing unit 12 therefore processes the electric signal from LC oscillating circuit 10 to reconstruct the time pattern f(t) of oscillation frequency f of said signal ( Figure 4) over a predetermined time interval ⁇ T in which drum 6 rotates at angular speed ⁇ 0 ; statistically processes the electric signal from LC oscillating circuit 10 to determine the mean value f m of frequency f of said signal over the time interval ⁇ T in which drum 6 rotates at angular speed ⁇ 0 ; and, finally, calculates the total weight m tot of the laundry currently inside drum 6 on the basis of mean value f m of frequency f of the electric signal from LC oscillating circuit 10 over the time interval ⁇ T in which drum 6 rotates at angular speed ⁇ 0 .
  • signal processing unit 12 calculates the total weight m tot of the laundry currently inside drum 6 on the basis of the mean value f m of frequency f of the electric signal from LC oscillating circuit 10, and taking into account the total weight distribution of the wash assembly of washing machine 1 between coil springs 4 supporting wash tub 3.
  • Signal processing unit 12 preferably, though not necessarily, also statistically processes the electric signal from LC oscillating circuit 10 to determine the value of the deviation ⁇ f in the time pattern f(t) of frequency f of the electric signal ( Figure 4) over the time interval ⁇ T in which drum 6 rotates at angular speed ⁇ 0 ; extrapolates from the value of deviation ⁇ f in the time pattern f(t) of frequency f of the electric signal from LC oscillating circuit 10 a coefficient of unbalance indicating the degree of unbalance of the laundry currently inside drum 6; and, finally, transmits the coefficient of unbalance to electronic central control unit 9 of washing machine 1.
  • signal processing unit 12 extrapolates the weight m' of the laundry mass theoretically concentrated at one point on the lateral wall of drum 6 on the basis of the value of deviation ⁇ f in the time pattern f(t) of frequency f of the electric signal from LC oscillating circuit 10; and the weight m" of the laundry mass theoretically distributed evenly inside drum 6 as the difference between the total weight m tot of the laundry in drum 6 and the weight m' of the laundry mass concentrated on the lateral wall of drum 6.
  • detecting device 8 preferably, though not necessarily, also comprises a position sensor 13 (e.g. a Hall-effect sensor) facing drum 6, and which determines when drum 6 is in a reference angular position inside wash tub 3, and supplies an electric signal s(t) indicating when drum 6 is in the reference angular position.
  • a position sensor 13 e.g. a Hall-effect sensor
  • signal processing unit 12 compares the electric signal s(t) from sensor 13 with the time pattern f(t) of oscillation frequency f of the electric signal from LC oscillating circuit 10 to determine the value of the time phase shift ⁇ between the instant drum 6 reaches the reference angular position, and the instant frequency f of the electric signal from LC oscillating circuit 10 reaches its maximum (or minimum) value, i.e. the instant length H of reference coil spring 4 reaches its maximum (or minimum) value; and then calculates, on the basis of the value of time phase shift ⁇ and the angular speed ⁇ 0 of drum 6, the position of the point on the lateral wall of drum 6 at which the laundry mass unevenly distributed inside drum 6 is theoretically concentrated.
  • the information concerning weight m' and the position, on the lateral wall of drum 6, of the barycentre of the laundry distributed unevenly, i.e. in unbalanced manner, inside drum 6, can then be used by electronic central control unit 9 of washing machine 1 as reference parameters by which to selectively move drum 6 in controlled manner in an attempt to distribute the laundry inside drum 6 more evenly.
  • washing machine 1 Operation of washing machine 1 is easily deducible from the foregoing description with no further explanation required.
  • electronic central control unit 9 of washing machine 1 activates drive unit 7 to rotate drum 6 about longitudinal axis A at angular speed ⁇ 0 , and then activates detecting device 8, which determines the time pattern H(t) of length H of reference coil spring 4 as drum 6 rotates at angular speed ⁇ 0 .
  • signal processing unit 12 of detecting device 8 acquires, instant by instant, the electric signal from LC oscillating circuit 10 incorporating reference coil spring 4 as an inductor, to reconstruct the time pattern f(t) of oscillation frequency f of the electric signal (Figure 4), which in turn is proportional to the time pattern H(t) of length H of reference coil spring 4 ( Figure 3).
  • signal processing unit 12 On acquiring the time pattern H(t) of length H of reference coil spring 4, signal processing unit 12 statistically processes time pattern H(t) of length H of reference coil spring 4 to determine the mean value H m of length H of reference coil spring 4 over the time interval ⁇ T in which drum 6 rotates at angular speed ⁇ 0 ; and then calculates the total weight m tot of the laundry currently inside drum 6 on the basis of mean value H m of length H of reference coil spring 4, and taking into account the weight distribution of the wash assembly between the coil springs 4 supporting wash tub 3, and the mechanical characteristics of reference coil spring 4.
  • signal processing unit 12 statistically processes the time pattern f(t) of oscillation frequency f of the electric signal from LC oscillating circuit 10 to determine the mean value f m of frequency f of the electric signal over time interval ⁇ T, and then calculates the total weight m tot of the laundry currently inside drum 6 on the basis of mean value f m of frequency f of the electric signal from LC oscillating circuit 10.
  • signal processing unit 12 When provided for, signal processing unit 12 also statistically processes the time pattern H(t) of length H of reference coil spring 4 to determine the value of deviation ⁇ H in the time pattern H(t) of length H of reference coil spring 4 over time interval ⁇ T; and then extrapolates from the value of deviation ⁇ H in the time pattern H(t) of length H of reference coil spring 4 the weight m' of the laundry mass theoretically concentrated at one point on the lateral wall of drum 6, i.e. a coefficient of unbalance indicating the degree of unbalance of the laundry currently inside drum 6.
  • signal processing unit 12 statistically processes the time pattern f(t) of oscillation frequency f of the electric signal from LC oscillating circuit 10 to determine the value of deviation ⁇ f in the time pattern f(t) of oscillation frequency f of the electric signal; and then extrapolates from the value of deviation ⁇ f in the time pattern f(t) of oscillation frequency f of the electric signal from LC oscillating circuit 10 the weight m' of the mass of laundry theoretically concentrated at one point on the lateral wall of drum 6.
  • signal processing unit 12 on acquiring the time pattern H(t) of length H of reference coil spring 4, signal processing unit 12 preferably, though not necessarily, also compares the electric signal s(t) from position sensor 13 with the time pattern H(t) of length H of reference coil spring 4, or rather, with the time pattern f(t) of oscillation frequency f of the electric signal from LC oscillating circuit 10, to determine the value of the time phase shift ⁇ between the instant drum 6 reaches said reference angular position, and the instant frequency f of the electric signal from LC oscillating circuit 10 reaches its maximum (or minimum) value; and then calculates, on the basis of the value of time phase shift ⁇ and the angular speed ⁇ 0 of drum 6, the exact position of the point, on the lateral wall of drum 6, at which the mass of laundry unevenly distributed inside drum 6 is theoretically concentrated.
  • Laundry weight detecting device 8 is also extremely cheap to produce, and can be integrated easily in currently marketed washing machines with only minor alterations to the electronic central control units governing operation of currently marketed washing machines.
  • coil springs 4 supporting wash tub 3 may be replaced with elastic members of rubber or other elastic nonmetal material.
  • detecting device 8 comprises a strain gauge or other sensor for determining the length of the elastic member instant by instant, and processes the signal from the strain gauge or similar statistically, as described above, to extrapolate the total weight m tot of the laundry currently inside drum 6.
  • Detecting device 8 may obviously also determine the weight m' of the mass of laundry theoretically concentrated at one point on the lateral wall of drum 6 on the basis of the deviation in the time pattern of the length of the elastic reference member; the weight m" of the mass of laundry distributed evenly inside drum 6 as the difference between the total weight m tot of the laundry in drum 6, and the weight m' of the mass of laundry concentrated on the lateral wall of drum 6; and the position of the point on the lateral wall of drum 6 at which the mass of laundry unevenly distributed inside drum 6 is theoretically concentrated.
  • signal processing unit 12 of detecting device 8 may also processes the time pattern H(t) of length H of reference coil spring 4, i.e. the time pattern f(t) of oscillation frequency f of the electric signal generated by LC oscillating circuit 10, to determine the instant value of the angular speed of drum 6.
  • the oscillation period of the time pattern H(t) of length H of reference coil spring 4 depends on the instant value of the angular speed of drum 6.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Treatment Of Fiber Materials (AREA)
EP06124604A 2006-11-22 2006-11-22 Verfahren zur Bestimmung des Gewichts der Wäsche und Waschmaschine zur Durchführung des Verfahrens Not-in-force EP1925708B1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AT06124604T ATE431453T1 (de) 2006-11-22 2006-11-22 Verfahren zur bestimmung des gewichts der wäsche und waschmaschine zur durchführung des verfahrens
DE602006006849T DE602006006849D1 (de) 2006-11-22 2006-11-22 Verfahren zur Bestimmung des Gewichts der Wäsche und Waschmaschine zur Durchführung des Verfahrens
PL06124604T PL1925708T3 (pl) 2006-11-22 2006-11-22 Sposób wyznaczania masy bielizny i maszyna piorąca implementująca ten sposób
EP06124604A EP1925708B1 (de) 2006-11-22 2006-11-22 Verfahren zur Bestimmung des Gewichts der Wäsche und Waschmaschine zur Durchführung des Verfahrens
ES06124604T ES2325177T3 (es) 2006-11-22 2006-11-22 Metodo para determinar el peso de la ropa de una colada y lavadora para llevar a la practica dicho metodo.
RU2007143174/12A RU2418118C2 (ru) 2006-11-22 2007-11-21 Способ определения массы белья, находящегося в барабане стиральной машины, и стиральная машина, реализующая этот способ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06124604A EP1925708B1 (de) 2006-11-22 2006-11-22 Verfahren zur Bestimmung des Gewichts der Wäsche und Waschmaschine zur Durchführung des Verfahrens

Publications (2)

Publication Number Publication Date
EP1925708A1 true EP1925708A1 (de) 2008-05-28
EP1925708B1 EP1925708B1 (de) 2009-05-13

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Application Number Title Priority Date Filing Date
EP06124604A Not-in-force EP1925708B1 (de) 2006-11-22 2006-11-22 Verfahren zur Bestimmung des Gewichts der Wäsche und Waschmaschine zur Durchführung des Verfahrens

Country Status (6)

Country Link
EP (1) EP1925708B1 (de)
AT (1) ATE431453T1 (de)
DE (1) DE602006006849D1 (de)
ES (1) ES2325177T3 (de)
PL (1) PL1925708T3 (de)
RU (1) RU2418118C2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109709813A (zh) * 2018-12-20 2019-05-03 无锡小天鹅股份有限公司 应用模式显示方法、装置及家用电器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225030A (en) * 1988-11-18 1990-05-23 Licentia Gmbh Load indicator for domestic washing machines
JPH02241493A (ja) * 1989-03-15 1990-09-26 Matsushita Electric Ind Co Ltd 洗濯乾燥機
GB2247250A (en) * 1990-06-27 1992-02-26 Hitachi Ltd Full-automated washing machine and full-automated washing and drying machine
DE29812393U1 (de) * 1998-07-11 1999-11-18 AEG Hausgeräte GmbH, 90429 Nürnberg Programmgesteuerte Waschmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4336350A1 (de) * 1993-10-25 1995-04-27 Bosch Siemens Hausgeraete Verfahren zum Bestimmen der Wäschemenge in einer Wäschebehandlungsmaschine
DE4336349A1 (de) * 1993-10-25 1995-04-27 Bosch Siemens Hausgeraete Verfahren zum Bestimmen der Masse von nasser Wäsche in einer Wäschetrommel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225030A (en) * 1988-11-18 1990-05-23 Licentia Gmbh Load indicator for domestic washing machines
JPH02241493A (ja) * 1989-03-15 1990-09-26 Matsushita Electric Ind Co Ltd 洗濯乾燥機
GB2247250A (en) * 1990-06-27 1992-02-26 Hitachi Ltd Full-automated washing machine and full-automated washing and drying machine
DE29812393U1 (de) * 1998-07-11 1999-11-18 AEG Hausgeräte GmbH, 90429 Nürnberg Programmgesteuerte Waschmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109709813A (zh) * 2018-12-20 2019-05-03 无锡小天鹅股份有限公司 应用模式显示方法、装置及家用电器

Also Published As

Publication number Publication date
ATE431453T1 (de) 2009-05-15
DE602006006849D1 (de) 2009-06-25
RU2007143174A (ru) 2009-05-27
ES2325177T3 (es) 2009-08-27
PL1925708T3 (pl) 2009-10-30
RU2418118C2 (ru) 2011-05-10
EP1925708B1 (de) 2009-05-13

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