US20090107185A1 - Method and apparatus for determining an imbalance condition in an appliance - Google Patents

Method and apparatus for determining an imbalance condition in an appliance Download PDF

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Publication number
US20090107185A1
US20090107185A1 US11/877,830 US87783007A US2009107185A1 US 20090107185 A1 US20090107185 A1 US 20090107185A1 US 87783007 A US87783007 A US 87783007A US 2009107185 A1 US2009107185 A1 US 2009107185A1
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United States
Prior art keywords
parameter
value
spread
parameter value
parameter values
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.)
Abandoned
Application number
US11/877,830
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English (en)
Inventor
Mariano Filippa
Edward Hatfield
II Richard D. Suel
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US11/877,830 priority Critical patent/US20090107185A1/en
Assigned to GENERAL ELECTRIC COMPANY reassignment GENERAL ELECTRIC COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FILIPPA, MARIANO, HATFIELD, EDWARD, SUEL, RICHARD D., II
Priority to CA002640828A priority patent/CA2640828A1/fr
Priority to EP08166863A priority patent/EP2053151A2/fr
Priority to MX2008013655A priority patent/MX2008013655A/es
Priority to CNA2008101499990A priority patent/CN101419112A/zh
Publication of US20090107185A1 publication Critical patent/US20090107185A1/en
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/16—Imbalance
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • 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
    • D06F2103/26—Imbalance; Noise level
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/48—Preventing or reducing imbalance or noise

Definitions

  • the present invention generally relates to methods and an apparatus for detecting imbalance conditions in an appliance.
  • Appliances such as automatic washing machines typically contain rotatable vessels that are designed to hold material or clothing and are known in the art.
  • the vessel is contained within a housing and is perforated with apertures.
  • the apertures allow water to be pumped into the vessel to wash the material in the vessel and to allow soiled water to be forced out of the vessel.
  • a washing machine usually contains a main control panel that controls various cycles, typically comprising a wash cycle, spin cycle, a rinse cycle, followed by another spin cycle. Water is pumped into the vessel during the wash cycle and rinse cycle, while it is extracted via centrifugal force during the spin cycle as the vessel rotates or spins.
  • a washing machine usually contains an agitator that oscillates to facilitate washing where the vessel rotates about a vertical axis. In machines that contain vessels that rotate about a horizontal axis, an agitator is usually not included as clothes can be tumbled instead of agitated in order to facilitate in the washing process.
  • Appliances that contain rotatable vessels are subject to operating conditions such as load imbalances.
  • Load imbalances in appliances such as washing machines occur when the material contained in the vessels is not evenly distributed within the vessel.
  • the material may be unevenly distributed when loaded into the vessel or may become unevenly distributed as the vessel rotates.
  • vertical-axis washing machines when a wash or rinse cycle completes and water is drained from the vessel, the clothes are gathered at the bottom of the vessel without being evenly distributed within the vessel. As the motor ramps up the speed for the next cycle, the clothes can creep up the sides of the vessel and become imbalanced.
  • load imbalances can occur when clothes are not evenly distributed during the machine's distribution cycle.
  • Load imbalance conditions can cause various inconveniences such as severe vibration and movement of the appliance. Severe vibration occurs when a load is imbalanced, or out of balance because the center of mass of the rotating vessel no longer corresponds to the geometric axis of the vessel. Severe vibration can cause an appliance to move along the surface it rests upon, for example, when a washing machine moves across the floor. Additionally, severe vibration can cause the vessel to break free from its mountings.
  • Another disadvantage of load imbalance conditions is that the motor's power is wasted in the vibrations and movement instead of being fully applied to rotating the vessel.
  • Prior art solutions designed to prevent imbalance conditions were typically mechanical and include adding masses to the rotatable vessel of the appliance in order to counter-balance imbalance conditions.
  • an appliance and method that can determine load imbalance or out-of-balance conditions.
  • the appliances that typically apply load imbalance detection are clothes washers.
  • a method of imbalance detection includes identifying parameter values that fluctuate with load imbalance over a predetermined sample period and determining a target parameter value from the identified parameter values.
  • the method further includes calculating a parameter spread of the parameter values by comparing parameter values to the target parameter value.
  • the method further includes converting the parameter spread into a weight value that reflects an imbalance condition.
  • a computer program embodied on a computer-readable medium includes identifying parameter values that fluctuate with load imbalance over a predetermined sample period and determining a target parameter value from the identified parameter values. The method further includes calculating a parameter spread of the parameter values by comparing parameter values to the target parameter value. The method further includes converting the parameter spread into a weight value that reflects an imbalance condition.
  • an appliance in another embodiment, includes a vessel mounted for rotation about an axis; a motor for rotating the vessel about an axis; a processor configured to determine load imbalance; and a memory for receiving and storing parameter data and instructions for determining load imbalance.
  • the load imbalance is determined by identifying parameter values that fluctuate with load imbalance over a predetermined sample period and determining a target parameter value from the identified parameter values.
  • the method further includes calculating a parameter spread of the parameter values by comparing parameter values to the target parameter value.
  • the method further includes converting the parameter spread into a weight value that reflects an imbalance condition.
  • FIG. 1 a is a view of a horizontal-axis washing machine.
  • FIG. 1 b is a diagram showing a horizontal-axis washing machine.
  • FIG. 2 is a block diagram showing a system for detecting a load imbalance in an embodiment of the present invention.
  • FIG. 3 is a flow diagram showing a method for detecting a load imbalance condition.
  • FIG. 4 is a table containing load imbalance data.
  • FIG. 5 is a graph of the load imbalance data of FIG. 4 .
  • One embodiment of the present invention concerns a method and a circuit for detecting a load imbalance in an appliance that is simple to implement.
  • a horizontal-axis washing machine in accordance with one embodiment of the present invention is illustrated generally at 10 .
  • a horizontal-axis washing machine includes a vessel that rotates about a horizontal axis within the cabinet.
  • Another embodiment of the invention includes a vertical-axis machine where the vessel rotates about a vertical axis within the cabinet.
  • Washer 10 includes a motor 12 and a motor control unit 14 (see FIG. 1 b ) that can also be integrated within one unit.
  • Washer 10 includes an outer housing or cabinet 20 supporting a fixed tub 22 , a vessel or moving tub (“tub”) 25 , motor 12 , and motor control unit 14 , within which there is a processor 102 , in a known manner. Vessel drive shaft 30 is also illustrated. Tub 25 is configured to hold articles (not shown) such as clothes to be washed.
  • FIG. 1 b illustrates a side view of the exemplary washer of the present invention.
  • a spin cycle liquid within the articles is removed by the centrifugal force imparted by the spinning vessel and is allowed to exit the basket through apertures (not shown).
  • articles or clothing becomes plastered to the wall of tub 25 at a first speed or plaster speed.
  • Plaster refers to the centrifugal force of the spin cycle pushing the clothing against the wall or structure of the basket.
  • the clothes remain positioned by centrifugal force during a time period the first speed or plaster speed to a second speed or maximum speed of the spinning basket.
  • the plastered speed and maximum speed can be determined by one of ordinary skill in the art. Load imbalance conditions can occur when the clothes are unevenly plastered throughout the vessel.
  • FIG. 2 depicts a block diagram showing an appliance for detecting a load imbalance in an embodiment of the present invention.
  • the appliance which could be an automatic washing machine 10 , can include a cabinet 20 , a vessel 25 , a motor 12 , and a motor control unit 14 including a memory 101 , a processor 102 , and a sensor 103 .
  • the cabinet 20 contains the vessel 25 that can be loaded with material, for example clothes.
  • the motor 12 drives the vessel and can be directly attached to the vessel by a belt, clutch, or a direct coupling, for example.
  • the motor can be any type, including an induction motor.
  • the sensor 103 can detect the rotation speed of the motor shaft along with other parameters that fluctuate due to load imbalance, such as voltage amplitude, torque and motor current, for example.
  • the memory 101 stores the executable instructions for controlling the functions of an appliance.
  • the processor 102 executes the instructions stored in the memory 101 .
  • the memory 101 can either be external or internal to the processor.
  • the processor may comprise any type of processor including microcontroller or a microprocessor.
  • the processor 102 executes the instructions to determine when an imbalance condition exists according to the method shown in FIG. 3 and takes corrective action if a sufficiently high imbalance or out of-balance (OOB) condition is detected.
  • OOB out of-balance
  • the actions taken when a sufficiently high imbalance condition is detected may include stopping the motor, attempts to re-balance the clothes in the tub, or a reduction of the allowed top speed.
  • FIG. 3 is a flow diagram showing a method for detecting a load imbalance condition.
  • the method includes selecting a parameter that fluctuates due to load imbalance, in this example, voltage amplitude which is required to maintain a constant speed.
  • the method further includes identifying parameter values in a predetermined sample period 201 and determining a target parameter value 202 , which is the average of the parameter values in this example.
  • the parameter measured is voltage amplitude, required to maintain a constant speed, which is measured at a fixed interval of time, (i.e. every 50 ms) of a pre-determined sample period.
  • the sample period represents the predetermined sample period, the time during which the parameter values are read.
  • the parameter values are stored in a data buffer of predetermined length in memory. If the buffer is full, return to the beginning of the data buffer so the parameter data will overwrite the oldest parameter data. The effect of this method is that of a moving data window or moving sample period.
  • the amplitude required to maintain the current speed is calculated in the microprocessor software.
  • the software increases or decreases voltage amplitude according to input from a speed sensor 103 to maintain a constant speed.
  • the speed sensor 103 may be employed to detect speed fluctuations of the motor shaft 36 .
  • the method further provides calculating a parameter spread of the parameter values described above 203 .
  • the parameter spread is calculated whenever the buffer window is full of parameter values, for example or in another embodiment, whenever a total number of parameter values is reached over a given sample period. Also, several sample periods may be taken over time, which constitutes a moving sample period.
  • the parameter spread comprises an average deviation based on the difference between the average of the parameter values in the sample period and a particular parameter value, although other methods of determining parameter spread may be used.
  • the processor 102 compares individual parameter values to a the target parameter value to get an average deviation of the parameter spread as shown below:
  • ⁇ i 1 N ⁇ ⁇ X i - X ⁇ N
  • the parameter spread shown by the equation above requires calculating the average (X) of the total number of parameter values from the sample period, summing the absolute value of each parameter value (X i ), which can be a real-time reading of the fluctuating parameter, minus the average (X), and dividing the sum by a predetermined number of values.
  • the processor can calculate the average parameter error by retrieving the parameter value data from memory at predetermined intervals.
  • the parameter spread may be converted to an actual weight value (Lbs or Kg) 204 that can be used to determine the existence of an imbalance condition 205 by the following equation:
  • OOB Lbs Parameter Spread/Load Constant
  • the load constant is calculated by applying a predetermined linear equation to the current load size in the washing machine tub.
  • the current load size can be determined in various ways as determined by one of ordinary skill in the art, and stored in memory as a weight value (lbs or kg).
  • the slope and offset comprise predetermined values that are constants calibrated using known or predetermined imbalance loads.
  • Load Constant (Load Size) (Slope)+Offset
  • the load constant may be determined through empirical data that may stored in tabular format in the memory 101 .
  • the load constant may be generated through the use of empirical data such as that provided in FIG. 4 utilizing the following equation wherein the parameter spread is the average deviation as provided in FIG. 4 .
  • the modification to the equation includes multiplying the parameter spread by the speed of the motor in order to normalize the voltage amplitude spread.
  • the modification to the equation above is not required, although desirable due to the drop in amplitude spread as speed increases. If the amplitude spread is multiplied by the speed, the resulting load constant curve is flatter and provides an improved imbalance calculation.
  • the OOB calculation is optimized between 90 basket RPM (or plaster speed) and about 150 basket RPM. This range may vary slightly based on machine dynamics.
  • Load Constant ⁇ 7.2623*Load Size+152.46
  • the load size is the actual weight of the clothes in the vessel.
  • the imbalance weight value (OOB Lbs) can be determined by the using the equation:
  • OOB Parameter Spread/Load Constant
  • An imbalance condition will be detected when the OOB value is above a predetermined value.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Testing Of Balance (AREA)
US11/877,830 2007-10-24 2007-10-24 Method and apparatus for determining an imbalance condition in an appliance Abandoned US20090107185A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US11/877,830 US20090107185A1 (en) 2007-10-24 2007-10-24 Method and apparatus for determining an imbalance condition in an appliance
CA002640828A CA2640828A1 (fr) 2007-10-24 2008-10-09 Methode et dispositif permettant de determiner un etat de desequilibre dans un appareil
EP08166863A EP2053151A2 (fr) 2007-10-24 2008-10-17 Procédé et appareil pour déterminer une condition de balourd d'un appareil
MX2008013655A MX2008013655A (es) 2007-10-24 2008-10-23 Metodo y aparato para determinar una condicion de carga desbalanceada en un electrodomestico.
CNA2008101499990A CN101419112A (zh) 2007-10-24 2008-10-24 在装置中确定不平衡状况的设备及方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/877,830 US20090107185A1 (en) 2007-10-24 2007-10-24 Method and apparatus for determining an imbalance condition in an appliance

Publications (1)

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US20090107185A1 true US20090107185A1 (en) 2009-04-30

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Application Number Title Priority Date Filing Date
US11/877,830 Abandoned US20090107185A1 (en) 2007-10-24 2007-10-24 Method and apparatus for determining an imbalance condition in an appliance

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US (1) US20090107185A1 (fr)
EP (1) EP2053151A2 (fr)
CN (1) CN101419112A (fr)
CA (1) CA2640828A1 (fr)
MX (1) MX2008013655A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
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CN102466538A (zh) * 2011-03-14 2012-05-23 无锡艾柯威科技有限公司 一种变频电机负载的不平衡检测方法
US8875332B2 (en) 2012-07-10 2014-11-04 Whirlpool Corporation Laundry treating appliance and method of operation
CN106637823A (zh) * 2016-12-13 2017-05-10 广东威灵电机制造有限公司 洗衣机及其的脱水控制方法和装置
US20180223467A1 (en) * 2015-08-04 2018-08-09 Aqua Co., Ltd Washing Machine
US10060067B2 (en) 2016-05-10 2018-08-28 Haier Us Appliance Solutions, Inc. Determining out of balance conditions of a washing machine

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CN202450294U (zh) * 2011-12-07 2012-09-26 博西华电器（江苏）有限公司 洗衣机用底座及洗衣机
EP2527511B1 (fr) * 2012-03-21 2014-04-16 Primus CE s.r.o. Procédé pour commander le processus de centrifugation d'une machine à laver
CN104452187B (zh) * 2014-11-21 2017-04-19 广东威灵电机制造有限公司 一种滚筒洗衣机及其不平衡检测方法和装置
CN108801323B (zh) * 2017-04-26 2022-01-04 博西华电器（江苏）有限公司 衣物护理机及检测衣物护理机是否安装平衡环的方法
JP2021534911A (ja) 2018-08-27 2021-12-16 エコラボ ユーエスエー インコーポレイティド 微粒子含有液体サンプルを濾過することなく抽出するためのシステムおよび技術
CN116575213B (zh) * 2023-07-13 2023-09-05 珠海格力电器股份有限公司 一种洗衣机负载称重方法及洗衣机
CN116575216B (zh) * 2023-07-13 2023-09-05 珠海格力电器股份有限公司 一种洗衣机负载称重方法及洗衣机

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Publication number Priority date Publication date Assignee Title
CN102466538A (zh) * 2011-03-14 2012-05-23 无锡艾柯威科技有限公司 一种变频电机负载的不平衡检测方法
US8875332B2 (en) 2012-07-10 2014-11-04 Whirlpool Corporation Laundry treating appliance and method of operation
US20180223467A1 (en) * 2015-08-04 2018-08-09 Aqua Co., Ltd Washing Machine
US10060067B2 (en) 2016-05-10 2018-08-28 Haier Us Appliance Solutions, Inc. Determining out of balance conditions of a washing machine
CN106637823A (zh) * 2016-12-13 2017-05-10 广东威灵电机制造有限公司 洗衣机及其的脱水控制方法和装置

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CA2640828A1 (fr) 2009-04-24
CN101419112A (zh) 2009-04-29
MX2008013655A (es) 2009-05-12
EP2053151A2 (fr) 2009-04-29

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Owner name: GENERAL ELECTRIC COMPANY, NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FILIPPA, MARIANO;HATFIELD, EDWARD;SUEL, RICHARD D., II;REEL/FRAME:020040/0920

Effective date: 20071024

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION