EP2692936A1 - Method for controlling the speed of a rotating drum of a horizontal axis washing machine and washing machine using such method - Google Patents
Method for controlling the speed of a rotating drum of a horizontal axis washing machine and washing machine using such method Download PDFInfo
- Publication number
- EP2692936A1 EP2692936A1 EP12178421.9A EP12178421A EP2692936A1 EP 2692936 A1 EP2692936 A1 EP 2692936A1 EP 12178421 A EP12178421 A EP 12178421A EP 2692936 A1 EP2692936 A1 EP 2692936A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- speed
- drum
- performance index
- washing machine
- motor
- 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
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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
-
- 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
- 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
- D06F2105/48—Drum speed
Definitions
- the present invention relates to a method for controlling the speed of a rotating drum of a horizontal axis washing machine comprising a step in which the load of the laundry is estimated or measured.
- the present invention relates to a horizontal washing machine adapted to carry out such method as well.
- horizontal axis washing machine we mean every appliance in which the rotating drum is mounted with a substantially horizontal axis; therefore washing machines with a slanted axis of rotation are comprised in the above definition.
- JP 2004236704 discloses a washing machine in which the drum is rotated slowly for performing soaking when wash eater is present in the drum, and at high speed for performing tumbling when wash water is drained from the drum.
- One of the most relevant features of the method according to the invention is to increase the efficiency during the tumbling phase of the washing process in a horizontal axis washing machine by changing dynamically the reference speed of the drum.
- the main benefits of the invention are a higher mechanical action and so reduced time for washing (and energy) and maximization of the motor efficiency having an equal mechanical action and time but saving energy.
- the adaptive speed control has the target to consider two main metrics, i.e. the mechanical action exerted upon the load and the motor efficiency.
- the output of the control logic is the magnitude A of the reference speed signal of a single base tumbling cycle, where in a first part of the cycle the drum speed A is clockwise and in a second part of such cycle the speed A is counterclockwise (or vice versa).
- the mechanical power can be estimated or measured from motor in different ways.
- the fire angle or the motor current can be converted to torque and then to mechanical power by using a look-up table or observer.
- the mechanical action trend has different shape. For example, for a full load (8 kg), the amount of mechanical action that can be generated is quite small, whatever speed you set. Otherwise, for a small load the variation of mechanical action can be very important against a little change of the rotation speed.
- Figure 3 shows a similar analysis done for electrical motor power required against speed and load size. Typically the higher is the speed the higher is the efficiency of the motor.
- the graphs of figure 3 show curves for universal motor used in an 8 kg machine with different loads.
- the algorithm according to the invention starts selecting an initial tumbling speed by using a predicted or calculated dry load mass and a look-up table.
- the benefits due to the speed variation are shown in Error! Reference source not found.. More in details, the energy consumption of two different tests with the same configuration for all the parameters are illustrated. The first one refers to standard control logic, i.e. with a fixed tumbling speed, while the second one refers to the adaptive logic according to the invention.
Abstract
Description
- The present invention relates to a method for controlling the speed of a rotating drum of a horizontal axis washing machine comprising a step in which the load of the laundry is estimated or measured. The present invention relates to a horizontal washing machine adapted to carry out such method as well. With the term "horizontal axis washing machine" we mean every appliance in which the rotating drum is mounted with a substantially horizontal axis; therefore washing machines with a slanted axis of rotation are comprised in the above definition.
- Today washing machines are controlled typically with a unique speed profile for each wash cycle.
JP 2004236704 - It is well known in the art the need either to reduce the duration of the washing cycle or to increase energy efficiency of the appliance.
- It is an object of the present invention to propose a method for controlling the motor of a washing machine according to which the overall cycle time can be reduced and the energy efficiency can be increased.
- According to the invention, such object is reached tanks to the features listed in the appended claims.
- One of the most relevant features of the method according to the invention is to increase the efficiency during the tumbling phase of the washing process in a horizontal axis washing machine by changing dynamically the reference speed of the drum.
- The main benefits of the invention are a higher mechanical action and so reduced time for washing (and energy) and maximization of the motor efficiency having an equal mechanical action and time but saving energy.
- The adaptive speed control has the target to consider two main metrics, i.e. the mechanical action exerted upon the load and the motor efficiency.
- Further advantages and features according to the present invention will become clear from the following detailed description, with reference to the attached drawings in which:
-
Figure 1 is a single base tumbling cycle typical of a horizontal axis washing machine; -
Figure 2 shows different diagrams for different loads showing how the mechanical power transferred to laundry load changes with the drum speed of rotation -
Figure 3 shows diagrams similar tofigure 2 in which, for different loads, it is shown how the electrical power of the motor changes with the drum speed of rotation; -
Figure 4 shows a flow diagram of a control algorithm according to the invention; -
Figure 5 shows how the drum speed is changed vs. time when the algorithm offigure 4 is implemented; -
Figure 6 show the speed variation offigure 5 vs. time; and -
Figure 7 is a diagram showing a comparison between a known standard washing cycle and an adaptive cycle according to the invention as far as energy consumption is concerned. - With reference to
figure 1 , the output of the control logic is the magnitude A of the reference speed signal of a single base tumbling cycle, where in a first part of the cycle the drum speed A is clockwise and in a second part of such cycle the speed A is counterclockwise (or vice versa). - Error! Reference source not found. shows the differences trend among mechanical power and tumbling speed against the load size. In a first approximation the friction of motors and washer can be considered as offset so mechanical action on laundry can be considered proportional to the mechanical power.
- The mechanical power can be estimated or measured from motor in different ways. On universal motor, typically used in washers, the fire angle or the motor current can be converted to torque and then to mechanical power by using a look-up table or observer.
- Depending on load size, the mechanical action trend has different shape. For example, for a full load (8 kg), the amount of mechanical action that can be generated is quite small, whatever speed you set. Otherwise, for a small load the variation of mechanical action can be very important against a little change of the rotation speed.
-
Figure 3 shows a similar analysis done for electrical motor power required against speed and load size. Typically the higher is the speed the higher is the efficiency of the motor. The graphs offigure 3 show curves for universal motor used in an 8 kg machine with different loads. By comparingfigures 2 and3 , it is clear how the trend of electrical power is different than the trend of the mechanical power. This means that generally the speed that can be selected to optimize the mechanical action doesn't optimize the energy efficiency. - In order to maximize the cycle performance, the applicant has discovered that the following control strategy can guarantee the best performances of a horizontal axis washing machine, either in term of cycle duration or energy efficiency:
- ● Maximize the mechanical action with an algorithm able to find the speed with highest mechanical action.
- ● Obtain best compromise between mechanical action and motor efficiency
-
- α = 1 will lead to a cycle that maximize the mechanical action (faster cycle)
- 0 < α
- < 1 will lead to a cycle to compromise mec□anical action and motor efficiency (efficiency cycle)
- From the example carried out by the applicant with reference to a commercial 8 kg washer, the following table of speed suggestions can be obtained:
Load Size Mass Interval [kg] Speed [rpm] Small m ≤ 3 45 Medium 3 < m < 6 50 Big m ≥ 6 60 - In order to improve the algorithm, considering the noise variation due the load estimation sensing and the process itself, it is possible to adjust the speed dynamically during the washing cycle following the algorithm shown in
figure 4 . A fake value is initially given to the performance index (typically 0) and to the speed variation (i.e. Δω(0) = 3 rpm). During every single tumbling cycle the average of mechanical and electrical power is estimated or measured and the performance index is computed according to the above formula. The value α is in relationship with the choice of the user (through a user interface) whether he/she prefers the shortest washing cycle or the lowest motor energy consumption. In this way the user can set the level of the compromise between the speed value corresponding to the highest mechanical action and to the speed value corresponding to the highest motor efficiency. Of course such α value can be also predetermined by the appliance manufacturer as a good compromise between duration of the washing cycle and energy efficiency of the motor. The performance index is compared with the one calculated at the cycle before. -
- Where:
- βm, βe are coefficients that make the two gradients comparable and that allow a tradeoff between a cycle more effective in mechanical action or more efficient in energy consumption.
- In Error! Reference source not found. it is represented the magnitude of the reference speed of the tumbling phase of a washing cycle that use the adaptive control logic according to the present invention. The speed value converges quickly to a stable one (more or less 58 rpm)
- In Error! Reference source not found. is shown the speed increase that the control logic forces on the reference speed on the same example of
figure 5 . - The benefits due to the speed variation are shown in Error! Reference source not found.. More in details, the energy consumption of two different tests with the same configuration for all the parameters are illustrated. The first one refers to standard control logic, i.e. with a fixed tumbling speed, while the second one refers to the adaptive logic according to the invention.
- If we consider a standard cycle with 3 hours long cycle there is an energy saving of about 15% between the two logics. The same benefits can be extended to time saving as well.
Claims (8)
- Method for controlling the speed of a rotating drum of a horizontal axis washing machine, comprising a step for assessing the weight of the laundry load, characterized in that it comprises a step to determine, for the assessed load weight, a drum speed which maximizes the mechanical action to the laundry and/or a drum speed which corresponds to the highest efficiency of the motor.
- Method according to claim 1, wherein the actual drum speed is calculated as a weighted average between the speed value corresponding to the highest mechanical action and to the speed value corresponding to the highest motor efficiency.
- Method according to claim 2, wherein the actual speed of the drum is calculated as the value which maximizes a performance index which is computed taking into consideration both the electrical power and the mechanical action.
- Method according to claim 3, wherein the computation of said performance index is carried out according to the following formula:Performance index = α · mech.power (ω) + (1 - α) · electrical power (ω) where:α = 1 will lead to a cycle that maximize the mechanical action (faster cycle)0 < α< 1 will lead to a cycle to comprimise mec□anical action and motor efficiency (efficiency cycle) .
- Method according to claim 3 or 4, wherein it comprises the following steps:- starting rotating the drum at a predetermined starting value;- based on the assessed load of laundry, determining the mechanical power and the electrical power;- computing said performance index;- comparing the calculated performance index with a starting predetermined performance index or with a performance index calculated in a previous step;- if the performance index increases, changing the drum speed in the same direction of the previous iteration, otherwise changing the direction; and- if the performance index remains substantially the same, discontinuing drum speeds change.
- Horizontal axis washing machine comprising a rotating drum, a motor and a control unit for driving the motor, such control unit being adapted to assess laundry load in the drum, characterized in that the control circuit is adapted to determine for the assessed load a drum speed corresponding to a maximized the mechanical action to the laundry and/or a drum speed corresponding to the highest efficiency of the motor.
- Horizontal axis washing machine according to claim 6, wherein the control unit is adapted to calculate a drum speed which is a weighted average between the speed value corresponding to the highest mechanical action and to the speed value corresponding to the highest motor efficiency.
- Horizontal axis washing machine according to claim 7, wherein a user interface is provided on which the user can set a value which sets the level of said weighted average between the speed value corresponding to the highest mechanical action and to the speed value corresponding to the highest motor efficiency.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES12178421.9T ES2587267T3 (en) | 2012-07-30 | 2012-07-30 | Method for controlling the speed of a rotating drum of a horizontal axis laundry machine and washing machine using such a method |
PL12178421T PL2692936T3 (en) | 2012-07-30 | 2012-07-30 | Method for controlling the speed of a rotating drum of a horizontal axis washing machine and washing machine using such method |
EP12178421.9A EP2692936B1 (en) | 2012-07-30 | 2012-07-30 | Method for controlling the speed of a rotating drum of a horizontal axis washing machine and washing machine using such method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12178421.9A EP2692936B1 (en) | 2012-07-30 | 2012-07-30 | Method for controlling the speed of a rotating drum of a horizontal axis washing machine and washing machine using such method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2692936A1 true EP2692936A1 (en) | 2014-02-05 |
EP2692936B1 EP2692936B1 (en) | 2016-07-20 |
Family
ID=46750177
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12178421.9A Not-in-force EP2692936B1 (en) | 2012-07-30 | 2012-07-30 | Method for controlling the speed of a rotating drum of a horizontal axis washing machine and washing machine using such method |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2692936B1 (en) |
ES (1) | ES2587267T3 (en) |
PL (1) | PL2692936T3 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017020772A1 (en) * | 2015-07-31 | 2017-02-09 | 广东威灵电机制造有限公司 | Drum washing machine, and control method and apparatus for same |
US10422068B2 (en) | 2016-02-12 | 2019-09-24 | Whirlpool Corporation | Laundry treating appliance and methods of operation |
EP3546633A4 (en) * | 2016-12-23 | 2019-10-09 | Samsung Electronics Co., Ltd. | Washing machine and method for controlling washing machine |
DE102019216697A1 (en) * | 2019-10-30 | 2021-05-06 | BSH Hausgeräte GmbH | Laundry care device with one control |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004236704A (en) | 2003-02-03 | 2004-08-26 | Sanyo Electric Co Ltd | Drum type washing machine |
US20080115295A1 (en) * | 2006-11-17 | 2008-05-22 | Kalyanakrishnan Vadakkeveedu | Mechanical action estimation for washing machines |
EP1441055B1 (en) * | 2003-01-15 | 2009-03-25 | Lg Electronics Inc. | Method for controlling dehydration speed of washing machine |
EP2080832A1 (en) * | 2008-01-16 | 2009-07-22 | Electrolux Home Products Corporation N.V. | Textile treatment apparatus having rotable drum |
US20110016738A1 (en) * | 2009-07-22 | 2011-01-27 | Whirlpool Corporation | Laundry treating appliance with controlled mechanical energy |
EP2471993A1 (en) * | 2009-08-24 | 2012-07-04 | Kabushiki Kaisha Toshiba | Drum type washing machine |
-
2012
- 2012-07-30 EP EP12178421.9A patent/EP2692936B1/en not_active Not-in-force
- 2012-07-30 ES ES12178421.9T patent/ES2587267T3/en active Active
- 2012-07-30 PL PL12178421T patent/PL2692936T3/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1441055B1 (en) * | 2003-01-15 | 2009-03-25 | Lg Electronics Inc. | Method for controlling dehydration speed of washing machine |
JP2004236704A (en) | 2003-02-03 | 2004-08-26 | Sanyo Electric Co Ltd | Drum type washing machine |
US20080115295A1 (en) * | 2006-11-17 | 2008-05-22 | Kalyanakrishnan Vadakkeveedu | Mechanical action estimation for washing machines |
EP2080832A1 (en) * | 2008-01-16 | 2009-07-22 | Electrolux Home Products Corporation N.V. | Textile treatment apparatus having rotable drum |
US20110016738A1 (en) * | 2009-07-22 | 2011-01-27 | Whirlpool Corporation | Laundry treating appliance with controlled mechanical energy |
EP2471993A1 (en) * | 2009-08-24 | 2012-07-04 | Kabushiki Kaisha Toshiba | Drum type washing machine |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017020772A1 (en) * | 2015-07-31 | 2017-02-09 | 广东威灵电机制造有限公司 | Drum washing machine, and control method and apparatus for same |
US10422068B2 (en) | 2016-02-12 | 2019-09-24 | Whirlpool Corporation | Laundry treating appliance and methods of operation |
EP3546633A4 (en) * | 2016-12-23 | 2019-10-09 | Samsung Electronics Co., Ltd. | Washing machine and method for controlling washing machine |
US11180883B2 (en) | 2016-12-23 | 2021-11-23 | Samsung Electronics Co., Ltd. | Washing machine and method for controlling washing machine |
DE102019216697A1 (en) * | 2019-10-30 | 2021-05-06 | BSH Hausgeräte GmbH | Laundry care device with one control |
Also Published As
Publication number | Publication date |
---|---|
ES2587267T3 (en) | 2016-10-21 |
EP2692936B1 (en) | 2016-07-20 |
PL2692936T3 (en) | 2017-08-31 |
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