EP2194180A2 - Waschmaschine und Fühlverfahren für das Wäschegewicht darin - Google Patents

Waschmaschine und Fühlverfahren für das Wäschegewicht darin Download PDF

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Publication number
EP2194180A2
EP2194180A2 EP09156898A EP09156898A EP2194180A2 EP 2194180 A2 EP2194180 A2 EP 2194180A2 EP 09156898 A EP09156898 A EP 09156898A EP 09156898 A EP09156898 A EP 09156898A EP 2194180 A2 EP2194180 A2 EP 2194180A2
Authority
EP
European Patent Office
Prior art keywords
power
voltage
abnormal
laundry
zero
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
EP09156898A
Other languages
English (en)
French (fr)
Other versions
EP2194180B1 (de
EP2194180A3 (de
Inventor
Soon Bae Yang
Jun Hyun Park
Chang Joo Park
Jung Chul Choi
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.)
Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP2194180A2 publication Critical patent/EP2194180A2/de
Publication of EP2194180A3 publication Critical patent/EP2194180A3/de
Application granted granted Critical
Publication of EP2194180B1 publication Critical patent/EP2194180B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • 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
    • D06F2103/44—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
    • 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 washing machine and a sensing method of the weight of laundry contained therein, and, more particularly, to a washing machine and a sensing method of the weight of laundry contained therein, which re-perform a laundry weight sensing process upon occurrence of an abnormal power voltage.
  • a washing machine includes a rotating tub connected to a motor to contain washing laundry and washes or dehydrates the laundry by rotation by driving the motor.
  • a washing process and a dehydrating process include a laundry weight sensing process.
  • a method to measure the magnitude of the load of the motor and calculate the laundry weight therefrom has been disclosed and such a method has been widely applied to the washing machine.
  • the method to sense a laundry weight using the load of the motor can ensure reliable weight sensing when force generated from the motor satisfies an effectively controlled state.
  • an alternating current (AC) power voltage is stably supplied to the washing machine, the motor is accurately controlled.
  • the AC power voltage is unstable, a voltage applied to the motor differs from a voltage of a control command, which influences the motor load to be measured. Accordingly, the weight of washing laundry is inaccurately sensed, and the washing process and the dewatering process may not be properly implemented.
  • a sensing method of a weight of laundry in a washing machine including sensing the weight of laundry by varying a speed of a motor according to a laundry weight sensing process, judging whether a power voltage supplied to the motor is abnormal while sensing the weight of laundry, and re-performing the sensing of the weight of laundry when the power voltage is abnormal.
  • the judging of whether the power voltage is abnormal may count a detection time of a zero voltage using a timer and judge abnormality according to a difference between a detection time of a previous zero voltage and a detection time of a current zero voltage.
  • the judging of whether the power voltage is abnormal may include determining whether the difference is greater than a preset maximum value or less than a preset minimum value, and if the difference is greater than the maximum value or less than the minimum value, judging that the power voltage is abnormal.
  • the re-performing of the sensing of the weight of laundry may be executed after a prescribed standby time.
  • the judging of whether the power voltage is abnormal may be executed whenever each interval is performed, and if an abnormal power voltage is generated, re-performing a corresponding interval.
  • a sensing method of a weight of laundry in a washing machine including a rotating tub, and a motor to rotate the rotating tub.
  • the method includes detecting a zero voltage of an alternating current (AC) power, determining whether a power voltage is abnormal by comparing a difference between a detection time of a current zero voltage and a detection time of a previous zero voltage with a reference value, and if an abnormal AC power is generated while sensing the weight of laundry, re-performing the sensing of the weight of laundry.
  • AC alternating current
  • the re-performing of the sensing of the weight of laundry may be executed, after waiting a set time from when the abnormal power voltage is generated and the set time has elapsed.
  • a washing machine including a rotating tub, and a motor to rotate the rotating tub.
  • the washing machine includes a power monitor to generate a signal to monitor a power supplied to the motor, and a controller to determine whether the power is abnormal according to the signal received from the power monitor, and re-perform sensing of the weight of laundry when the power is abnormal.
  • the power monitor may be a zero-voltage detector to detect a zero voltage of an AC power.
  • the controller may include a timer to count a detection time of a zero voltage of the zero-voltage detector and determine whether the power is abnormal according to a difference between a detection time of a previous zero voltage and a detection time of a current zero voltage, using the timer.
  • the controller may judge that the power is abnormal if the difference is greater than a maximum value or less than a minimum value.
  • a washing machine including a rotating tub to contain laundry, a motor to rotate the rotating tub, an AC power to drive the motor, a zero-voltage detector to detect a zero voltage of the AC power and generate a zero-voltage signal, and a microprocessor to determine whether the AC power is abnormal according to an input time of the zero-voltage signal and sense the weight of the laundry when the AC power is abnormal.
  • the microprocessor may include a timer to perform a count operation according to the zero-voltage signal, and judge that the AC power is abnormal due to abrupt power failure if a count value of the timer is greater than a first reference value.
  • the microprocessor may include a timer to perform a count operation according to the zero-voltage signal, and judge that the AC power is abnormal due to noise contained in the power if a count value of the timer is less than a second reference value.
  • FIG. 1 is a cross-sectional view illustrating the configuration of a washing machine according to an exemplary embodiment of the present invention
  • FIG. 2 is a block diagram of a washing machine according to an exemplary embodiment of the present invention
  • FIG. 3a is a view explaining a laundry weight sensing process according to an exemplary embodiment of the present invention
  • FIG. 3b is a view illustrating a count value when a zero-voltage signal is input according to an exemplary embodiment of the present invention.
  • a washing machine 10 of the present invention includes a rotating tub 12 installed within a water tub 11 and a motor 13 to drive the rotating tub 12.
  • a universal motor comprised of a field coil and an armature is described as an illustrative example of the motor 13.
  • a belt 14 is connected between a rotating axis of the motor 13 and a pulley 15 coupled to one side of the rotating tub 12.
  • the belt 14 transfers the rotating force of the motor 13 and rotates the rotating tub 12 using the rotating force.
  • an AC power 20 supplied to the washing machine is converted into a direct current (DC) power in a rectifier 21 and the converted DC power is supplied to the motor 13.
  • a microprocessor 30 receives a driving power through another rectifier 24 and a switched mode power supply (SMPS) 25, in addition to the AC power.
  • SMPS switched mode power supply
  • Reference numeral 26 denotes a capacitor.
  • a power switch 22 connected to the AC power 20 is turned on or off by the microprocessor 30.
  • the power switch 22 is described as being configured by a triac, the present invention is not limited thereto and a switch which can switch an input power under control of the microprocessor 30 may be used.
  • the microprocessor 30 increases or decreases a duty of a gate signal applied to the triac 22 to control a voltage applied to the motor 13.
  • a speed sensor 23 measures a motor speed and provides the microprocessor 30 with a pulse corresponding to the motor speed.
  • the microprocessor 30 recognizes the motor speed using the provided pulse.
  • the speed sensor 23 may be comprised of a tachogenerator but any speed sensor which can measure a motor speed may be employed.
  • the microprocessor 30 senses the weight of laundry according to a previously stored program and varies the motor speed according to a laundry weight sensing process as illustrated in FIG. 3a .
  • a first interval t1 or t11 is an accelerating interval to increase the motor speed to a set speed S; a second interval t2 or t12 is a standby interval for stabilization of the motor speed; a third interval t3 or t13 is an average duty calculation interval to calculate an average duty while the motor rotates the set number of rotations; a fourth interval t4 or t14 is an accelerating interval to increase the motor speed with a duty which is more increased by a prescribed ratio than the average duty; and a fifth interval t5 or t15 is a motor rotation time measurement interval to measure a single rotation time of the motor during the accelerating interval.
  • the motor speed, the number of rotations, and the duty applied to each interval are not limited to specific numbers and they may vary in consideration of characteristics of the motor applied to the washing machine.
  • the washing machine includes a power monitor 40 to monitor the state of the AC power 20.
  • the power monitor 40 serves to monitor whether an AC power is provided without a variation of a voltage.
  • the power monitor 40 is comprised of a zero-voltage detector to generate a zero-voltage signal when the AC power of a prescribed frequency is a zero voltage.
  • an electric circuit which can confirm the variation state of a power voltage may be applied to the power monitor 40.
  • the microprocessor 30 includes a divider 31 to divide an input clock and a timer 32 to perform a counting operation using the divided clock.
  • the microprocessor 30 receives the zero-voltage signal and measures a detection time of the zero-voltage signal using the timer 32. For example, as illustrated in FIG. 3b , the timer 32 increases a count value according to the input of the zero-voltage signal. When the zero-voltage signal is input again, the counter 32 30 resets the count value and then increases the count value. The timer 32 repeats a process to the count value and reset the count value whenever the zero-voltage signal is input.
  • an input power voltage V i regularly generates a zero voltage in correspondence to a power frequency, as illustrated in FIG. 4 .
  • a zero-voltage signal generated each time an input power is a zero voltage includes a signal, for example, 'C' appearing due to the noise, as well as a normal signal.
  • the count value counted by the timer 32 according to a normal zero-voltage signal may be reset by an abnormally generated zero-voltage signal and then may start count again. Thereafter, the count value is reset when a normal zero-voltage signal is input again.
  • the microprocessor 30 since a count value 'A' of the counter 32, which is generated by an abnormally generated zero signal due to noise, is less than a reference value ZC, the microprocessor 30 can recognize the unstable state of the AC power based on such a count value of the timer 32.
  • the AC power may be unstable due to abrupt power failure as illustrated in FIG. 6 .
  • an interval B during which a voltage does not appear temporally may occur in the middle of the AC power. Since a zero-voltage signal does not appear during the interval of abrupt power failure, the count value of the timer 32 is greater than the reference value ZC. Therefore, the microprocessor 30 can recognize the unstable state of the AC power based on such a count value of the timer 32. In this case, even if the abrupt power failure occurs, since the microprocessor 30 receives a power charged to the capacitor 26, the microprocessor 30 can execute a control operation.
  • the microprocessor 30 judges that the voltage state of the AC power is unstable while sensing the weight of laundry, the microprocessor 30 stops the laundry weight sensing process and re-performs the laundry weight sensing process from the beginning.
  • Various embodiments to re-perform the laundry weight sensing process when a voltage variation is unstable will be described hereinbelow.
  • FIGS. 7 and 8 A laundry weight sensing method according to an exemplary embodiment of the present invention is described with reference to FIGS. 7 and 8 .
  • a washing machine applied to this exemplary embodiment senses the weight of laundry using the laundry weight sensing process in a washing process and a dehydrating process as described previously.
  • the microprocessor 30 monitors a voltage state of an AC power using a zero-voltage signal received from the zero-voltage detector 40 (step 50).
  • the microprocessor 30 varies a motor speed according to the laundry weight sensing process as illustrated in FIG. 3a .
  • the microprocessor 30 drives the motor 13 to increase a motor speed to the set speed S.
  • the set speed S may be, but is not limited to, 80 rpm in consideration of the state that laundry contained in a rotating tub is attached to an inner surface of the washing machine.
  • the microprocessor 30 If the motor speed reaches the set speed, the microprocessor 30 enters a standby state to maintain the set speed for two seconds for example (step 52). Next, the microprocessor 30 calculates an average duty during 4 rotations of the motor (step 53).
  • the microprocessor 30 accelerates the motor speed with a duty greater than 1.5 times the average duty (step 54). In this case, the microprocessor 30 measures a single rotation time of the motor (step 55).
  • the microprocessor 30 judges whether an abnormal voltage is generated while monitoring an AC power (step 56). If an abnormal voltage is generated, the microprocessor 30 proceeds to step 50 to perform the laundry weight sensing process again and repeats the above-described operation.
  • the microprocessor 30 calculates a laundry weight according to the single rotation time of the motor (step 57).
  • step 56 A process to judge whether an abnormal voltage is generated in step 56 is described in detail with reference to FIG. 8 .
  • the microprocessor 30 determines whether a zero-voltage signal is input (step 60). If the zero-voltage signal is input, the timer 32 is rest to start count. A count value of the timer 32 is increased until a next zero-voltage signal is input. The microprocessor 30 confirms an input time of the zero-voltage signal (step 61) and calculates a difference T between a count value ZC i at an input time of a previous zero-voltage signal and a count value ZC i-1 at an input time of a current zero-voltage signal (step 62).
  • the microprocessor 30 judges whether the difference T in a count value is greater than a preset maximum value T MAX (step 63). If the difference T is not greater than the maximum value T MAX , the microprocessor 30 judges whether the difference T is less than a preset minimum value T MIN (step 64).
  • the microprocessor 30 determines that an abnormal zero-voltage signal is generated by noise included in the AC power as illustrated in FIG. 5 . If the difference T is greater than the preset maximum value T MAX , the microprocessor determines that the zero-voltage signal is not generated by abrupt power failure as illustrated in FIG. 6 . If such abnormality case is judged (step 65), the microprocessor 30 re-executes the laundry weight sensing process.
  • the power voltage is judged to be normal (step 66) and the microprocessor 30 calculates the weight of laundry according to the single rotation time of the motor.
  • FIG. 9 is a flow chart explaining a sensing method of the weight of laundry according to another exemplary embodiment of the present invention.
  • steps 70, 71, 72, 73, 74, 75, 76, and 77 execute the same operation as steps 50, 51, 52, 53, 54, 55, 56, and 57 shown in FIG. 7 .
  • the microprocessor 30 enters a standby state (step 78) instead of directly starting a laundry weight sensing operation and judges whether a prescribed time, for example, one to two seconds has elapsed (step 79). If the prescribed time has elapsed, the microprocessor 30 proceeds to step 70 to re-execute the laundry weight sensing operation.
  • FIG. 10 is a flow chart explaining a sensing method of the weight of laundry according to a further exemplary embodiment of the present invention.
  • steps 80, 81, 83, 85, 87, 88, and 90 execute the same operation as steps 50, 51, 52, 53, 54, 55, and 57 shown in FIG. 7 . Additionally, whenever each step ends, the microprocessor 30 monitors an AC power and judges whether an abnormal power voltage is generated (steps 82, 84, 86, and 89). If the abnormal power voltage is generated, corresponding steps are re-executed.
  • steps illustrated in FIG. 8 are identically applied to a processor to judge whether the abnormal voltage is generated in FIG. 10 .
  • the laundry weight sensing process is reperformed when a power voltage applied to the motor varies due to an unstable AC power being supplied to the washing machine, the reliability of a laundry weight can be ensured and functions in a washing process and a dehydrating process to which the laundry weight sensing process is applied can be effectively executed.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP09156898.0A 2008-12-02 2009-03-31 Waschmaschine und Fühlverfahren für das Wäschegewicht darin Expired - Fee Related EP2194180B1 (de)

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Application Number Priority Date Filing Date Title
KR1020080121380A KR20100062655A (ko) 2008-12-02 2008-12-02 세탁기 및 그 세탁물 무게 감지 방법

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EP2194180A2 true EP2194180A2 (de) 2010-06-09
EP2194180A3 EP2194180A3 (de) 2010-09-08
EP2194180B1 EP2194180B1 (de) 2013-11-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9840805B2 (en) 2015-06-17 2017-12-12 Haier Us Appliance Solutions, Inc. Methods for determining load mass in washing machine appliances
WO2021065539A1 (ja) * 2019-10-03 2021-04-08 パナソニックＩｐマネジメント株式会社 洗濯機

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11479897B1 (en) 2021-09-09 2022-10-25 Midea Group Co., Ltd. Laundry washing machine weight sensing system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008003710A1 (en) 2006-07-04 2008-01-10 Arcelik Anonim Sirketi A washer/dryer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008003710A1 (en) 2006-07-04 2008-01-10 Arcelik Anonim Sirketi A washer/dryer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9840805B2 (en) 2015-06-17 2017-12-12 Haier Us Appliance Solutions, Inc. Methods for determining load mass in washing machine appliances
WO2021065539A1 (ja) * 2019-10-03 2021-04-08 パナソニックＩｐマネジメント株式会社 洗濯機
JPWO2021065539A1 (de) * 2019-10-03 2021-04-08
CN114207208A (zh) * 2019-10-03 2022-03-18 松下知识产权经营株式会社 洗衣机
JP7336644B2 (ja) 2019-10-03 2023-09-01 パナソニックＩｐマネジメント株式会社 洗濯機

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KR20100062655A (ko) 2010-06-10
EP2194180A3 (de) 2010-09-08

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