CN111235817B

CN111235817B - Control method of washing machine and washing machine

Info

Publication number: CN111235817B
Application number: CN202010023199.5A
Authority: CN
Inventors: 彭建珍; 蔡诗阳; 韦皓; 李雪
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-11-02
Filing date: 2020-01-09
Publication date: 2021-01-22
Anticipated expiration: 2040-01-09
Also published as: CN111088642A; CN111058219A; CN111139620A; CN111235818A; CN211947598U; CN212925484U; CN212152794U; CN111197225A; CN111394931A; CN212611479U; WO2021083006A1; CN111074476A; CN111074474A; CN111058218B; CN111074473A; CN111074475A; CN111118810B; CN212152788U; CN212357689U; EP4026938A4

Abstract

The invention belongs to the field of household appliances, and particularly discloses a control method of a washing machine, wherein the washing machine comprises a washing barrel and a heating cavity, the washing barrel comprises a circulating water return pipe and a circulating water outlet pipe, the circulating water return pipe and the circulating water outlet pipe are both connected to the heating cavity, and the control method comprises the following steps: after the water is fed into the washing barrel, the detergent sinks into the barrel bottom of the washing barrel along with water flow, and the water in the washing barrel is controlled to enter the heating chamber through the circulating water outlet pipe for heating treatment and then return through the circulating water return pipe. Before the whole washing program is started, the water mixed with the detergent is heated and circulated, so that the detergent deposited in the washing barrel and the water are sufficiently circulated, hot water is added in the circulation process, and the hot water sufficiently activates detergent active enzyme, so that the purposes of sufficiently dissolving the detergent and improving the cleaning ratio are achieved.

Description

Control method of washing machine and washing machine

Technical Field

The invention belongs to the field of household appliances, and particularly relates to a control method of a washing machine and the washing machine.

Background

In the washing process of the washing machine, because the dissolving effect of some detergents is poor or the water temperature of washing water cannot reach the temperature at which the detergents are fully dissolved, the detergents remain on a washing barrel or clothes, the detergent cannot be fully dissolved, the utilization rate is low, the problem of detergent residue of the clothes is also brought, and the cleaning ratio is reduced. At present, many washing devices are provided with automatic feeding devices, and a washing powder feeding device is lacked, so that washing powder is directly fed to the bottom of an inner barrel, and when water enters, the washing powder enters a barrel bottom pump hose and cannot be utilized, and washing powder in a washing barrel cannot be fully dissolved, so that the washing powder is remained on the washing barrel or clothes. In order to improve the utilization rate of the washing powder, the prior washing machine has a scheme of promoting the dissolution of the washing powder by controlling the water carried by the washing barrel to rotate at a high speed, but the method is not beneficial to the temperature rise and the service life of the motor.

The present invention has been made in view of the above circumstances.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a detergent which can be fully dissolved, reduce the detergent residue and improve the washing ratio of clothes.

In order to solve the above technical problems, the present invention provides a control method of a washing machine, the washing machine including a washing tub and a heating chamber, the washing tub including a circulation water return pipe and a circulation water outlet pipe, both of which are connected to the heating chamber,

before the washing barrel enters the washing program, a detergent dissolving process is also executed, and the detergent dissolving process comprises the following steps: after the water is fed into the washing barrel, the detergent sinks into the barrel bottom of the washing barrel along with water flow, and the water in the washing barrel is controlled to enter the heating chamber through the circulating water outlet pipe for heating treatment and then return through the circulating water return pipe.

Further preferably, when the water level in the washing tub reaches a first preset water level, controlling the water in the washing tub to enter the heating chamber through the circulating water outlet pipe for heating treatment, and when the water level in the heating chamber reaches a highest water level, controlling the heating chamber to stop water inlet.

Further preferably, when the water level in the washing tub reaches a second preset water level in the process that the water at the bottom of the washing tub enters the heating chamber through the circulating water outlet pipe, the washing tub is controlled to operate at a first rotating speed, and the first preset water level is greater than the second preset water level.

Further preferably, after the heating chamber stops water feeding, the washing tub is controlled to operate at a second rotation speed, and the first rotation speed is greater than the second rotation speed.

Further preferably, after the water in the heating chamber returns to the washing tub through the circulating water return pipe, it is further determined whether the number of circulating times of the water in the washing tub reaches a preset number, if the number of circulating times reaches the preset number, the washing procedure is performed, and if the number of circulating times does not reach the preset number, the water at the bottom of the washing tub is controlled again to enter the heating chamber through the circulating water outlet pipe for heating treatment.

Further preferably, the washing machine includes a plurality of washing tubs, and the plurality of washing tubs perform washing simultaneously, the control method including:

and after the plurality of washing barrels finish water inlet according to the water inlet time sequence, controlling the plurality of washing barrels to enter a detergent dissolving process in sequence according to a preset sequence.

Further, it may be preferable that the order of the plurality of washing tubs entering the detergent dissolving process is determined according to the water inlet timing of the plurality of washing tubs, and the washing tub of the most advanced water preferentially enters the detergent dissolving process.

Further preferably, the water inlet timings of the plurality of washing tubs are obtained according to the load amounts of the plurality of washing tubs and/or the capacities of the washing tubs, with the largest load amount of the washing tub being the most advanced water.

Further preferably, the number of cycles in the detergent dissolution process is determined according to the water level and/or the load amount of the washing tub, the order of the plurality of washing tubs entering the detergent dissolution process is determined according to the size of the number of cycles, and the washing tub having a large number of cycles preferentially performs the detergent dissolution process.

Further preferably, the plurality of washing tubs are controlled to enter the detergent dissolving process in sequence according to the priority level defined by the user, and the washing tub with the higher priority level enters the detergent dissolving process preferentially.

Further preferably, in the detergent dissolving process of the plurality of washing tubs, after all the washing tubs are controlled to execute an individual water path circulation process according to a preset sequence, the next individual water path circulation process is executed according to the preset sequence until all the washing tubs complete respective circulation times.

Further preferably, the method comprises the following steps:

s1, the washing machine starts to feed water, and the water level in the washing barrel reaches the preset water level;

s2, controlling water in the washing barrel to enter the heating chamber through the circulating water outlet pipe and controlling the washing barrel to rotate at a first rotating speed;

s3, when the water level in the heating cavity is detected to reach the highest water level, controlling the inner barrel to run at a second rotating speed, and controlling the channel of the circulating water outlet pipe to be closed, wherein the first rotating speed is higher than the second rotating speed;

s4, when the water temperature in the heating chamber reaches the preset water temperature, controlling the water in the heating chamber to return to the washing tub through the circulating water return pipe;

s5, judging whether the circulation frequency of the water in the washing barrel reaches the preset frequency, if so, entering S6, and if not, returning to S2;

and S6, the washing machine enters a washing program.

The invention also provides a washing machine with the control method.

After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects: before the whole washing program is started, the water mixed with the detergent is heated and circulated, so that the detergent deposited in the washing barrel and the water are sufficiently circulated, hot water is added in the circulation process, and the hot water sufficiently activates detergent active enzyme, so that the purposes of sufficiently dissolving the detergent and improving the cleaning ratio are achieved.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is a structural view of a washing machine according to an embodiment of the present invention.

Fig. 2 is a control logic diagram of the washing machine according to the embodiment of the present invention.

Wherein: 1. a first washing tub; 11. a first circulating water outlet pipe; 12. a first circulating water return pipe; 13. a drain valve of the first washing tub;

2. a second washing tub; 21. a second circulating water outlet pipe; 22. a second circulating water return pipe; 23. a drain valve of the second washing tub;

3. a third washing tub; 31. a third circulating water outlet pipe; 32. a third circulating water return pipe; 33. a drain valve of the third washing tub;

4. a heating chamber; 41. a first liquid level detection device; 42. a second liquid level detection device; 43. heating wires; 44. detecting the water temperature; 45. a water inlet pipeline; 46. a water outlet pipeline; 47. a drain line; 48. heating chamber drain valve

5. A circulation pump; 6. a water diversion chamber.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "contacting," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The control method of the invention is suitable for both single-barrel washing machines and multi-barrel washing machines. In order to better embody the inventive concept of the present invention, the present embodiment uses a multi-tub washing machine as an example to explain the present invention, and the protection scope of the present invention is not limited thereby.

Example 1

The washing machine as shown in fig. 1 comprises a first washing tub 1, a second washing tub 2 and a third washing tub 3, wherein the first washing tub 1 comprises a first circulation water outlet pipe 11 and a first circulation water return pipe 12, and a first washing tub drain valve 13 is arranged on the first circulation water outlet pipe 11. The second washing barrel 2 comprises a second circulating water outlet pipe 21 and a second circulating water return pipe 22, and a second washing barrel drain valve 23 is arranged on the second circulating water outlet pipe 21. The third washing tub 3 includes a third circulation water outlet pipe 31 and a third circulation water return pipe 32, and a drain valve of the third washing tub 3 is disposed on the third circulation water outlet pipe 31.

The washing machine of the embodiment further includes a heating chamber 4, the heating chamber 4 includes a water inlet pipeline 45 and a water outlet pipeline 46, the first circulation water outlet pipe 11, the second circulation water outlet pipe 21 and the third circulation water outlet pipe 31 are communicated with the water inlet pipeline 45, and the first circulation water return pipe 12, the second circulation water return pipe 22 and the third circulation water return pipe 32 are communicated with the water outlet pipeline 46. A water drainage pipeline 47 is arranged on the water inlet pipeline 45, a heating chamber drain valve 48 is arranged on the water drainage pipeline 47, and a circulating pump 5 is arranged on the water outlet pipeline 46. A heating wire 43 is provided in the heating chamber 4 for heating the water in the heating chamber 4, a first level detecting means 41 is provided at a position near above the heating wire 43 for determining a heating water level, and a second level detecting means 42 is provided at a top portion of the inside of the heating chamber 4 for determining a maximum water level of the heating chamber 4. The first and second liquid

level detection devices

41 and 42 may be selected from a steel needle liquid level detection device and a radar liquid level detection device. A water temperature sensing means 44 is also provided in the heating chamber 4 for sensing the temperature of the water in the heating chamber 4.

The washing machine of the embodiment further comprises a water diversion chamber 6, a water outlet pipeline 46 of the heating chamber 4 is connected with a water inlet end of the water diversion chamber 6, and the first circulating water return pipe 12, the second circulating water return pipe 22 and the third circulating water return pipe 32 are respectively connected with a water outlet end of the water diversion chamber 6.

After the washing machine adds the detergent before washing the clothes, the dissolving effect of some detergents is poor, or the water temperature of the washing water cannot reach the temperature at which the detergent is fully dissolved, so that the detergent remains on the washing tub or the clothes. Especially, when a user washes clothes by using washing powder, the washing powder can directly sink to the bottom of the inner barrel after being added, and the washing powder cannot be fully dissolved; meanwhile, the washing powder sinking into the bottom of the barrel can enter a pump hose at the bottom of the barrel along with water flow, and the washing powder cannot be utilized.

In order to fully dissolve the detergent, a detergent dissolving process is added, that is, after water is fed, the detergent sinks into the bottom of the washing tub along with water flow, and water at the bottom of the washing tub is controlled to enter the heating chamber 4 for heating treatment and then returns to the washing tub, so that hot water is delivered into the washing tub, the hot water fully activates detergent active enzymes, the detergent is fully dissolved, and the cleaning ratio is improved.

The washing machine of the embodiment can be selected from any washing barrel to operate independently, two washing barrels can be selected to operate, and even three washing barrels can be selected to operate simultaneously. The control logic diagram of the detergent dissolution process is shown in FIG. 2. The embodiment uses only controlling the washing of the first washing tub 1 as an example, when the first washing tub 1 is started, the water is fed before the washing is started, when the water feeding is completed, whether the water level in the first washing tub 1 reaches a first preset water level is detected, if the water level does not reach the first preset water level, the water is supplemented to the first preset water level, and the first preset water level at the position is the water level of the normal washing of the first washing tub 1. When the water level in the first washtub 1 reaches a first preset water level, the first washtub 1 enters a detergent dissolving process. The method specifically comprises the following steps: and controlling the drainage valve 13 of the first washing barrel to be opened and the drainage valve of the circulating water cavity to be closed. At this time, the passage of the circulating water outlet pipe is conducted, and at this time, the water in the first washing tub 1 flows into the water inlet pipe of the heating chamber 4 through the first circulating water outlet pipe 11, and finally enters the heating chamber 4 through the water inlet pipe for heating treatment. Since most of the detergent such as laundry powder sinks to the bottom of the first washing tub 1, the first circulation outlet pipe 11 is preferably disposed at the bottom of the first washing tub 1, and the water mixed with the detergent at the bottom of the first washing tub 1 enters the heating chamber 4.

In order to allow the water mixed with the detergent to rapidly flow into the heating chamber 4, when the water level of the first washtub 1 reaches a second preset water level in the process that the water enters the heating chamber 4, the second preset water level is less than or equal to the first preset water level, and the first washtub 1 is also controlled to operate at a first rotation speed. Preferably, the first rotation speed is greater than 120r/mi n, and the partial water in the washing tub is thrown out by rotating the partial water at a high speed, so that the concentration of the detergent in the washing tub is increased, and the detergent can better enter the inside of the laundry.

After the water in the first washing tub 1 enters the heating chamber 4, the water level in the heating chamber 4 is also detected in the present embodiment, and in order to avoid dry burning of the heating wire 43, the heating wire 43 is controlled to heat when the water level in the heating chamber 4 reaches the heating water level (i.e. the water level that can be detected by the first water level detecting means). When the water level in the heating chamber 4 reaches the highest water level (i.e. the water level detected by the second water level detection device), the first washing tub drain valve 13 is controlled to close, i.e. the passage of the first circulation water outlet pipe 11 is cut off, and at this time, the heating chamber 4 stops water inflow.

When the heating chamber 4 stops water feeding, the first washing tub 1 is controlled to operate at the second rotation speed, and the first rotation speed is greater than the second rotation speed. Since a portion of the water in the first washing tub 1 flows into the heating chamber 4, the concentration of the detergent dissolved in the first washing tub 1 increases, and the detergent is sufficiently absorbed by the laundry by controlling the first washing tub 1 to be decelerated, the second rotation speed ranging from 40 to 60r/mi n.

This embodiment still detects the temperature of water in heating chamber 4, and when the temperature of heating chamber 4 reached and predetermine the temperature, control heater strip 43 stopped heating, then control circulating pump 5 starts, and the water in the heating chamber 4 gets into minute water cavity 6 through the outlet pipe of heating chamber 4, is at last returned to first washtub 1 in through first circulation wet return 12 by minute water cavity 6, until the hot water evacuation in the heating chamber 4.

When the water in the heating chamber 4 returns to the first washing tub 1 through the first circulating water return pipe 12, it is further determined whether the circulation frequency T of the water in the first washing tub 1 reaches a preset frequency, if the circulation frequency T reaches the preset frequency, the washing procedure is performed, and if the circulation frequency T does not reach the preset frequency, the water in the first washing tub 1 is controlled again to enter the heating chamber 4 through the first circulating water outlet pipe for heating treatment.

The specific control flow chart is as follows:

further preferably, the method comprises the following steps:

s2, controlling water of the bottom of the washing barrel to enter the heating chamber 4 through the circulating water outlet pipe, and controlling the washing barrel to rotate at a first rotating speed;

s3, when the water level in the heating chamber 4 reaches the highest water level, controlling the inner barrel to run at a second rotating speed, and controlling the channel of the circulating water outlet pipe to be closed, wherein the first rotating speed is higher than the second rotating speed;

s4, controlling the water in the heating chamber 4 to return to the washing barrel through a circulating water return pipe;

s5, judging whether the circulation time T of the water in the washing barrel reaches the preset time, if so, entering S6, and if not, returning to S2;

and S6, the washing machine enters a washing program.

Example 2

The present embodiment is different from embodiment 1 in that the washing machine of the present embodiment has a plurality of washing tubs to wash simultaneously. The washing machine includes a plurality of washing tubs, and the plurality of washing tubs perform washing simultaneously, the control method including: and after the plurality of washing barrels finish water inlet according to the water inlet time sequence, controlling the plurality of washing barrels to enter a detergent dissolving process in sequence according to a preset sequence.

One way that can be implemented is: before the plurality of washing barrels wash water, the water inlet time sequences of the plurality of washing barrels are obtained according to the load of the plurality of washing barrels and/or the capacity of the washing barrels, and the most advanced water of the washing barrel with the maximum load/capacity of the washing barrel is obtained. The sequence of the plurality of washing tubs entering the detergent dissolving process is determined according to the water inlet time sequences of the plurality of washing tubs, and the washing tub with the most advanced water preferentially enters the detergent dissolving process. This is because the most advanced washing tub of water is often loaded with a large amount of detergent and requires much detergent to be put into the tub, and thus the detergent is more likely to be insoluble. The washing barrel with large loading capacity is controlled to preferentially carry out the process of the detergent solvent, so that the longest period occupied by the washing barrel in the detergent dissolving process of the whole washing machine can be ensured, and the detergent can be more fully dissolved.

Another practicable manner is that the number of cycles in the detergent dissolution process is determined according to the water level and/or the load of the washing tub, the order of the plurality of washing tubs entering the detergent dissolution process is determined according to the number of cycles, and the washing tub with a large number of cycles preferentially performs the detergent dissolution process. And in the process of dissolving the washing agents in the washing barrels, after all the washing barrels are controlled to execute an independent waterway circulation process according to a preset sequence, the next independent waterway circulation process is executed according to the preset sequence until all the washing barrels finish respective circulation times. The detergent dissolving process is firstly carried out by controlling the washing barrel with the largest cycle period, and when the washing barrel finishes the whole detergent dissolving process, other washing barrels finish the detergent dissolving process in advance, so that the whole detergent dissolving time of the whole washing machine can be shortened.

In another practical manner, the user defines the priorities of the plurality of washing tubs for executing the detergent dissolving process, the washing machine determines the priority of executing the detergent dissolving process according to the priority determined by the user, and the washing tub with the higher priority enters the detergent dissolving process preferentially.

Taking the washing machine of fig. 1 as an example, the first, second, and

third washtubs

1, 2, and 3 perform washing simultaneously. Before entering the washing program formally, entering a first washing barrel 1, a second washing barrel 2 and a third washing barrel 3 and entering water before washing, obtaining water inlet time sequences of the three washing barrels according to the load capacity of the three washing barrels and/or the capacity of the washing barrels, sequentially carrying out detergent dissolving processes of the three washing barrels according to the water inlet time sequences, or determining the cycle times in the detergent dissolving processes according to the load and/or water level condition of each washing barrel, determining the sequence of the washing barrels entering the detergent dissolving processes according to the cycle times, and further determining the sequence of the detergent dissolving processes according to the priority sequence customized by a user. For example, the order of entering the detergent dissolving process into the three washtubs according to any of the above methods is third washtub 3 > second washtub 2 > first washtub 1, and when the three washtubs are all filled with water, the detergent dissolving process into the three washtubs may be implemented in a manner that: the third washing tub 3 firstly enters a detergent dissolving process, and after the third washing tub 3 finishes the detergent dissolving, the third washing tub 3 enters a washing program; then, after the second washing barrel 2 finishes the dissolution of the detergent, the second washing barrel 2 enters a washing program; and finally, after the third washing tub 3 finishes the dissolution of the detergent, the third washing tub 3 enters a washing program.

Another way of doing this is to control the second washtub 2 to enter a single water circuit cycle of the detergent solvent process after the third washtub 3 completes a single water circuit cycle of the detergent solvent process, and finally control the first washtub 1 to enter a single water circuit cycle of the detergent solvent process. And then the washing machine enters a next independent waterway circulation process according to the sequence of the third washing barrel 3, the second washing barrel 2 and the first washing barrel 1 until all the washing barrels complete the washing powder dissolving program and then simultaneously enter a washing stage.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A control method of a washing machine, characterized in that the washing machine comprises a washing tub and a heating chamber, the washing tub comprises a circulation water return pipe and a circulation water outlet pipe, both of which are connected to the heating chamber,

before the washing barrel enters the washing program, a detergent dissolving process is also executed, and the detergent dissolving process comprises the following steps: after the water is fed into the washing barrel, the detergent sinks into the barrel bottom of the washing barrel along with water flow, and the water at the barrel bottom of the washing barrel is controlled to enter a heating cavity through a circulating water outlet pipe for heating treatment and then return through a circulating water return pipe;

the washing machine includes a plurality of washing tubs, and the plurality of washing tubs perform washing simultaneously, the control method including: after the plurality of washing barrels finish water inflow according to a water inflow time sequence, controlling the plurality of washing barrels to enter a detergent dissolving process in sequence according to a preset sequence;

determining the sequence of the plurality of washing barrels entering a detergent dissolving process according to the water inlet time sequences of the plurality of washing barrels, wherein the washing barrel with the most advanced water preferentially enters the detergent dissolving process, the water inlet time sequences of the plurality of washing barrels are obtained according to the load capacity of the plurality of washing barrels and/or the capacity of the washing barrels, and the washing barrel with the largest load capacity is the most advanced water; or,

determining the circulation times in the detergent dissolving process according to the water level and/or the load of the washing barrel, determining the sequence of the plurality of washing barrels entering the detergent dissolving process according to the circulation times, and preferentially executing the detergent dissolving process by the washing barrel with large circulation times.

2. The control method of a washing machine according to claim 1, wherein when the water level in the washing tub reaches a first preset water level, controlling the water of the washing tub to enter the heating chamber through the circulation outlet pipe for heating treatment, and when the water level of the heating chamber reaches a maximum water level, controlling the heating chamber to stop water inflow.

3. The control method of a washing machine as claimed in claim 2, wherein the washing tub is controlled to operate at a first rotation speed when the water level in the washing tub reaches a second preset water level, the first preset water level being greater than the second preset water level, in the course of the water of the washing tub entering the heating chamber through the circulation outlet pipe.

4. The control method of a washing machine as claimed in claim 3, wherein the washing tub is controlled to be operated at the second rotation speed after the water supply to the heating chamber is stopped, the first rotation speed being greater than the second rotation speed.

5. The control method of a washing machine according to claim 4, wherein after the water in the heating chamber returns to the washing tub through the circulation return pipe, it is further determined whether the number of circulation times of the water in the washing tub reaches a preset number, and if the number of circulation times reaches the preset number, the washing process is performed, and if the number of circulation times does not reach the preset number, the water in the washing tub is controlled again to enter the heating chamber through the circulation outlet pipe for heating treatment.

6. The control method of a washing machine according to claim 1, wherein in the detergent dissolving process of the plurality of washing tubs, after controlling all the washing tubs to perform an individual water circulation process according to a preset sequence, the next individual water circulation process is performed according to the preset sequence until all the washing tubs complete respective circulation times.

7. The control method of a washing machine according to claim 1, comprising:

and S6, the washing machine enters a washing program.

8. A washing machine comprising the control method of any one of claims 1 to 7.