CN112941803B - Control method of washing machine and washing machine - Google Patents

Abstract

The present invention discloses a control method of a washing machine and a washing machine, and relates to the field of washing equipment. The washing machine of the present invention has a photoelectric sensor for detecting the height of clothes and the water level in the inner barrel, and the control method is that the washing machine controls the photoelectric sensor to emit light to the inner barrel, and judges the height of clothes and the water level by the reflection time and/or reflectivity of the light. The washing machine can provide feedback and calculate the water level and the height of clothes respectively by providing a sensor, which saves hardware settings and reduces costs; the washing machine can adjust the water level of water inlet according to the actual height of clothes, save water and detergent usage, and prevent overflow by judgment.

Description

A washing machine control method and washing machine

Technical Field

The present invention belongs to the field of washing equipment, and in particular, relates to a control method of a washing machine and a washing machine.

Background technique

Washing machines in the prior art generally use a method of weighing clothes to select the water level corresponding to the weight of the clothes. The weighing method uses the current generated by the motor when the inner barrel rotates to perform fuzzy weighing, and then determines the water inlet gear according to the weight. In order to ensure the washing effect and make the washing water submerge the clothes, the washing machine generally selects a larger water inlet gear according to the program settings, and cannot make corresponding adjustments according to the actual height of the clothes, resulting in a waste of water resources and detergent. Washing machines are generally equipped with a water level sensor to feedback the water level, but the water level sensor can only feedback the water level and cannot feedback the height of the clothes.

Since clothes have different properties, for example, down jackets and other clothes have more air inside, so they have a larger volume under a smaller weight, and may float on the water surface during the water intake process. In the prior art, the properties of clothes are judged only by the program selected by the user. For the above situation, the washing machine should choose a different processing method from that of ordinary clothes to achieve a better processing effect.

In view of this, the present invention is proposed.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a control method that can simultaneously obtain the height of clothing and the height of the water surface through a photoelectric sensor and can select the water inlet level according to the height of the clothing, as well as a washing machine with the above method, which can save water while ensuring a better washing effect.

In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

A control method for a washing machine, wherein the washing machine has a photoelectric sensor for detecting the height of clothes and the water level in an inner barrel, the washing machine controls the photoelectric sensor to emit light to the inner barrel, and determines the height of clothes and the water level by the reflection time and/or reflectivity of the light.

In one implementation, the washing machine determines the height of the clothes and the water level according to the reflection time of the light, the photoelectric sensor simultaneously emits multiple beams of light into the inner tub, and the washing machine calculates the height of each beam of light relative to the bottom of the inner tub according to the reflection time of the multiple beams of light to form a height data set;

When the height data group contains multiple similar height values, the washing machine uses the average of the multiple similar height values as the water surface height, and uses the average of other height values in the height data group as the clothing height;

Preferably, when the height data set contains height values close to zero, the washing machine excludes the height values close to zero before calculating the average value.

Specifically, when the washing machine is not filled with water, the washing machine excludes height values close to zero in the height data group, and takes the average of the remaining height values as the initial clothing height. During the process of water filling, the washing machine excludes multiple similar height values, and takes the average of the remaining height values as the real-time clothing height.

The washing machine also includes a weighing device for weighing the weight of the clothes in the inner drum. The washing machine determines whether the clothes are suitable for selecting the water inlet level according to the initial height of the clothes and the weight of the clothes;

A certain laundry weight is preset with a corresponding preset height interval. When the initial laundry height exceeds the preset height interval, the washing machine determines that the laundry is not suitable for selecting the water inlet level based on the height, and the washing machine selects the water level corresponding to the laundry weight to control the water inlet;

When the initial height of the clothes is within the preset height range, the washing machine determines that the clothes are suitable for selecting the water inlet level according to the height of the clothes, and the washing machine selects the water level corresponding to the initial height of the clothes to control the water inlet.

Furthermore, when the washing machine determines that the water inlet level is suitable for the clothes according to the height of the clothes, the washing machine sets a warning water level according to the weight of the clothes. When the washing machine lets water in according to the height of the clothes, when the real-time water level exceeds the warning water level, the washing machine controls the water inlet to stop to prevent overflow.

When the washing machine is filling with water, when the real-time clothing height does not exceed the initial clothing height, the washing machine obtains the real-time water level height. When the real-time water level height exceeds the real-time clothing height, or the real-time water level height exceeds the real-time clothing height by a certain distance, the washing machine controls the water filling to stop.

The clothes may float on the water surface during the water intake process. When the real-time clothes height exceeds the initial clothes height, the washing machine determines that the clothes are floating and controls the pulsator to rotate;

When the real-time height of the clothes is not higher than the initial height of the clothes after the pulsator rotates, the washing machine controls the water inlet to stop when the water level exceeds the real-time height of the clothes, or when the real-time water level exceeds the real-time height of the clothes by a certain distance;

When the real-time clothing height is still higher than the initial clothing height after the pulsator rotates, the washing machine controls water supply to stop after the real-time clothing height exceeds the initial clothing height by a certain distance.

The washing machine selects the water level according to the height of the clothes in the washing program, and the washing machine selects the water level according to the weight/height of the clothes in the rinsing program;

Preferably, when the real-time water level in the washing program exceeds the real-time clothing height by a certain distance h1, the washing machine controls the water supply to stop; when the real-time water level in the rinsing program exceeds the real-time clothing height by a certain distance h2, the washing machine controls the water supply to stop, h2＞h1.

Another implementation is that the washing machine determines the source of the reflected light according to the reflectivity of the light, and calculates the height of the clothes/water level according to the reflection time of the light;

Preferably, the washing machine is preset with a first reflectivity interval and a second reflectivity interval. When the reflectivity of the light falls into the first reflectivity interval, the washing machine determines it as reflected light from the water surface. When the reflectivity of the light falls into the second reflectivity interval, the washing machine determines it as reflected light from clothes.

The present invention also includes a washing machine having the above control method, wherein the washing machine has a photoelectric sensor for detecting the height of the clothes and the water level in the inner tub;

Preferably, the washing machine has an upward clothing loading port, an upper cover is provided at the clothing loading port, and a photoelectric sensor is provided on the side of the upper cover facing the inner barrel.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

(1) The washing machine is equipped with a sensor that can measure the water level and the height of the clothes respectively, which saves hardware settings through calculation and reduces the cost of the washing machine;

(2) The washing machine can adjust the water level according to the actual height of the clothes, ensuring that the clothes are submerged to achieve a better washing effect while saving water and detergent;

(3) The washing machine makes a judgment on the clothes that are not suitable for selecting the water inlet level according to the clothing height to prevent overflow.

The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

FIG1 is a schematic diagram of a washing machine provided with a photoelectric sensor according to the present invention;

2-3 are schematic diagrams of an implementation method of a washing machine control method of the present invention;

FIG. 4 is a schematic diagram of another embodiment of the control method of the washing machine of the present invention.

In the figure: 1. washing machine; 11. upper cover; 12. photoelectric sensor.

It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

As shown in Figure 1, the present invention relates to a washing machine 1, which can be a pulsator washing machine, having a washing tub arranged in a vertical direction, which can include an inner tub and an outer tub, the top of the washing tub has an opening, the opening of the washing tub and the opening of the washing machine pan form a clothing loading port, and an upper cover 11 is arranged at the clothing loading port. During the clothing washing process, the upper cover of the washing machine is in a closed state.

The upper cover 11 of the washing machine of the present invention is provided with a photoelectric sensor 12, which can emit light and receive reflected light, and calculate the distance traveled by the light according to the time difference between emitting and receiving the light. The photoelectric sensor 12 can emit light into the inner tub, and the washing machine can calculate or judge the reflected light of the photoelectric sensor to obtain the water level height and the clothing height.

As shown in Fig. 1, the photoelectric sensor 12 is arranged on the upper cover 11 of the washing machine and can emit light into the inner tub, so the photoelectric sensor is arranged on the side of the upper cover facing the inner tub. Preferably, the photoelectric sensor is arranged in the middle of the upper cover and aligned with the axis of the inner tub to ensure that the light emitted by the photoelectric sensor can be evenly distributed inside the inner tub.

The present invention also includes a control method for the above-mentioned washing machine, wherein the photoelectric sensor emits light into the inner barrel, and the light is reflected when it reaches the water surface or the surface of the clothes, and the reflected light is captured by the photoelectric sensor after a certain reflection time, so that the distance between the water surface or the surface of the clothes and the photoelectric sensor can be calculated according to the reflection time. Since the size of the inner barrel is fixed, the distance between the bottom of the inner barrel and the photoelectric sensor is constant. When the distance between the water surface or the surface of the clothes and the photoelectric sensor is obtained, the height of the water surface or the surface of the clothes from the bottom of the inner barrel can be obtained, that is, the water level height/the height of the clothes.

The method for distinguishing whether the reflected light is reflected from the water surface or the clothing surface can be determined by the reflection time of the light or the reflectivity of the light.

Embodiment 1

In this embodiment, the source of the reflected light is determined by the reflection time of the light, as shown in FIG. 2 .

The principle of this embodiment is that the photoelectric sensor simultaneously emits multiple beams of light into the inner barrel, and the washing machine calculates the height of each beam of light relative to the bottom of the inner barrel according to the reflection time of the multiple beams of light to form a height data set. Without considering the fluctuation of the water surface, the height of the water surface is equal at all places, so it can be considered that when the n beams of light correspond to the same height, the height is the water surface height. Clothes are generally uneven, and the height corresponding to each beam of light reflected after irradiating the clothes may be different. Therefore, when there are clothes and water in the inner barrel, it can be considered that the other lights except the above n beams of light are all reflection lines irradiated on the clothes. After calculating the average value of the height corresponding to the remaining lights, it can be considered as the height of the clothes. Generally, when the water level exceeds the height of the clothes, the water intake can be stopped, so that the water intake just covers the clothes, so as to achieve the purpose of saving water.

Specifically, for example, the photoelectric sensor simultaneously emits x beams of light into the inner tub, wherein the reflected light of the x beams of light is reflected to the sensor within time t1, t2, t3...tx. The washing machine can calculate the corresponding heights H1, H2, H3...Hx according to the reflection time t1, t2, t3...tx, and the above multiple groups of heights form a height data group.

When the height data group contains multiple similar height values, the washing machine takes the average of the multiple similar height values as the water surface height. After the washing machine obtains the above height array, when H1, H2, H3...Hn have only a slight difference or are equal, it can be considered that the light corresponding to H1, H2, H3...Hn is reflected by the water surface. Therefore, the water surface height HW is obtained by averaging H1, H2, H3...Hn.

The light corresponding to other height values Hn+1...Hx in other height data groups can be considered to be reflected by the clothes, and the average value of Hn+1...Hx is calculated as the clothing height HC.

The distance H between the bottom of the inner barrel and the light sensor is a fixed value. When the reflection time of the light is t, the distance traveled by the reflection is C×t (C is the speed of light). The height relative to the bottom of the inner barrel can be converted to H-Ct. The height data in the height data group are all obtained by this calculation method.

Among them, the photoelectric sensor detects the time difference between when the light is emitted and when the reflected light is received, but the distance traveled by the emitted light and the reflected light is equal and the time is the same, so the reflection time corresponding to the reflected light is half of the time difference.

When there is no water in the inner tub, the light emitted by the photoelectric sensor may reach the bottom of the inner tub and then reflect. At this time, the calculated height value is close to zero. When the height data group contains a height value close to zero, the washing machine will exclude the height value close to zero and then calculate the average value.

In the actual washing process, the photoelectric sensor can detect the height of the clothes and the water level during the water intake process, and can also detect the height of the clothes when the water is not taken in. Specifically, when the washing machine is not taken in water, the washing machine excludes the height value close to zero in the height data group, and takes the average value of the remaining height values as the initial clothes height HCi. During the water intake process, the washing machine excludes multiple similar height values, and takes the average value of the remaining height values as the real-time clothes height HCc.

In general, the height of clothes will not change during the water intake process, that is, HCc=HCi. However, for some clothes, the real-time clothing height HCc will be greater than the initial clothing height HCi or less than the initial clothing height HCi during the water intake process.

For example, when the clothing is a down jacket, since there is a large amount of air in the down jacket, the height of the clothing has a larger value when no water enters. However, during the water intake process, the water flow hits the clothing, expelling the air in the clothing and lowering the height of the clothing. When the clothing is made of lighter material, it may float on the water surface during the water intake process, and the real-time clothing height increases with the increase of the water level.

Down jackets and other fluffy clothing have a smaller weight, but the clothing itself has a larger volume, and the clothing has a greater height when placed in the inner barrel. Therefore, it is not suitable to select the water level according to the height of the clothing, otherwise too much water will enter and cause a waste of water resources.

For more fluffy clothes, use the following method to determine whether it is appropriate to select the water level according to the height of the clothes:

As shown in FIG3 , a general washing machine is provided with a weighing device for weighing the weight of the clothes in the inner barrel. The washing machine of the present invention further includes a weighing device for weighing the weight of the clothes in the inner barrel. The washing machine determines whether the clothes are suitable for selecting the water inlet level according to the height of the clothes by the initial height of the clothes and the weight of the clothes. Specifically, a certain weight of clothes is preset with a corresponding preset height interval. When the initial height of the clothes exceeds the preset height interval, the washing machine determines that the clothes are not suitable for selecting the water inlet level according to the height, and the washing machine selects the water level corresponding to the weight of the clothes to control the water inlet; when the initial height of the clothes is within the preset height interval, the washing machine determines that the clothes are suitable for selecting the water inlet level according to the height of the clothes, and the washing machine selects the water level corresponding to the initial height of the clothes to control the water inlet.

In order to facilitate the description of the above control process, the parameter assignments involved in the above process are described, but the numerical values are only used to illustrate the technical solution, and are not real data in actual operation. For example, when the weight of the clothes is 1kg, the preset height interval is 10-20cm. When the clothes in the inner barrel are weighed and the initial clothes height HCi is obtained, the obtained clothes weight is 1kg. It is determined whether the initial clothes height HCi is within its preset height interval. When HCi = 15cm, it is within the preset height interval, which proves that the clothes are not very fluffy, and it is suitable to select the water inlet level according to the height of the clothes to save water resources; when HCi = 25cm, it exceeds the preset height interval, which proves that the clothes are very fluffy. Therefore, in order to avoid the situation where the water inlet level is too high, the clothes in the inner barrel are not suitable for selecting the water inlet level according to the height of the clothes.

Furthermore, in order to avoid water overflow accidents, when the washing machine determines that the water inlet level is suitable for the clothes according to the height of the clothes, the washing machine can set a warning water level according to the weight of the clothes. The warning water level is generally a higher water level, or the highest water level. When the washing machine is letting water in according to the height of the clothes, when the real-time water level exceeds the warning water level, the washing machine controls the water inlet to stop.

The specific control method for the water inlet process is that during the water inlet process, when the real-time clothing height HCc does not exceed the initial clothing height HCi, the washing machine obtains the real-time water level height HWc; when the real-time water level height HWc exceeds the real-time clothing height HCc, or when the real-time water level height HWc exceeds the real-time clothing height HCc by a certain distance h1, the washing machine controls the water inlet to stop.

Generally speaking, a good washing effect can be achieved if the water in the drum of the washing machine is enough to submerge the clothes. However, in order to ensure that the clothes have sufficient space to be stirred in the washing water, the water level can also be made slightly higher than the clothes to ensure that the clothes can be stirred smoothly.

Due to the influence of clothing material or other factors, the height of the clothing in the inner drum may change. For example, the clothing floats in the water, causing the real-time clothing height HCc to exceed the initial clothing height HCi. At this time, it is not feasible to control the water inlet to stop by the real-time water level height exceeding the real-time clothing height. Therefore, the washing machine needs to first determine whether the clothing is in a floating state.

When the real-time clothing height HCc exceeds the initial clothing height HCi, the washing machine determines that the clothing is in a floating state. When clothing floats on the water, it may be a temporary phenomenon caused by the air in the clothing not being discharged. The clothing can be rolled or pressed into the water by controlling the rotation of the impeller or spraying the clothing, so that the air is released from the clothing. When the clothing is submerged in water, the floating condition of the clothing will be improved, so that the water level judgment process can continue.

After the pulsator rotates or the clothes are sprayed, if the real-time clothes height HCc is not higher than the initial clothes height HCi, it means that the clothes are no longer floating. At this time, the water stop control can be performed by comparing the water level with the clothes height. The washing machine is further controlled to stop water inflow when the water level exceeds the real-time clothes height, or when the real-time water level exceeds the real-time clothes height by a certain distance h1.

After the pulsator rotates or the clothes are sprayed, if the real-time clothes height HCc is still higher than the initial clothes height HCi, it can be considered that the clothes cannot be floated in an improved state by the pulsator rotation or spraying due to their own properties or other reasons. Therefore, after the real-time clothes height HCc exceeds the initial clothes height HCi for a short distance or a short period of time, the washing machine controls the water supply to stop to prevent the water level from being too high.

Generally, the water level selected by the washing machine during the washing process is just enough to submerge the clothes, so as to achieve better mutual friction and a good washing effect. During the rinsing process, since the rinse water is needed to rinse out the residual detergent in the clothes, the water level during the rinsing process is slightly higher than the water level during washing.

In the control method of the washing machine of the present invention, in order to save washing water, the washing machine selects the water inlet level according to the height of the clothes in the washing program, and in the rinsing program, the washing machine can select the water inlet level of the rinsing water according to the weight of the clothes, or according to the height of the clothes.

When the washing machine always selects the water inlet level in the rinsing program, a certain water saving purpose can also be achieved. However, the water inlet amount at this time is slightly different. The control method can be: when the real-time water level height of the washing machine in the washing program exceeds the real-time clothing height by a certain distance h1, the washing machine controls the water inlet to stop; when the real-time water level height of the washing machine in the rinsing program exceeds the real-time clothing height by a certain distance h2, the washing machine controls the water inlet to stop, h2＞h1.

Embodiment 2

The difference between this embodiment and the previous embodiment is that the washing machine determines the source of the reflected light according to the reflectivity of the light, calculates the height of the clothes by the reflection time of the light from the clothes, and calculates the water level by the reflection time of the light from the water surface, as shown in Figure 4.

Since the water surface and the clothing surface have different properties, the reflectivity of the water surface and the clothing surface to light is also different. The difference in the above properties can be used by the photoelectric sensor to determine the source of the reflected light, and thus determine the corresponding height based on the source of the reflected light.

Specifically, the washing machine is preset with a first reflectivity interval and a second reflectivity interval. When the reflectivity of the light falls into the first reflectivity interval, the washing machine determines it as reflected light from the water surface. When the reflectivity of the light falls into the second reflectivity interval, the washing machine determines it as reflected light from the clothes.

The reflectivity of light is the ratio of the intensity of the reflected light received by the photoelectric sensor to the intensity of the emitted light emitted by the photoelectric sensor.

The distance H between the bottom of the inner barrel and the light sensor is a constant. When the reflection time of the light is t, the distance traveled by the reflection is C×t (C is the speed of light). The height relative to the bottom of the inner barrel can be converted to H-Ct. Among them, the photoelectric sensor detects the time difference between when the light is emitted and when the reflected light is received, but the distance traveled by the emitted light and the reflected light is equal, and the time is the same, so the corresponding reflection time of the light is half of the time difference. Accordingly, when the reflectivity of the light falls into the first reflectivity interval, the height is calculated according to the reflection time of the light, which is the water surface height. When the reflectivity of the light falls into the second reflectivity interval, the height is calculated according to the reflection time of the light, which is the clothing height.

In the control method of the washing machine in the above two embodiments, the washing machine is equipped with a sensor to measure the water level height and the clothing height respectively, which saves hardware settings through calculation and reduces the cost of the washing machine; the washing machine can adjust the water level of the water inlet according to the actual height of the clothing, while ensuring that the clothing is submerged to achieve a better washing effect, it can save water and detergent usage; the washing machine makes judgments on clothing that is not suitable for selecting the water level of the water inlet according to the clothing height to prevent overflow.

The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims (13)

1. A control method of a washing machine is characterized in that the washing machine is provided with a photoelectric sensor for detecting the height of clothes and the height of water level in an inner barrel, the washing machine controls the photoelectric sensor to emit light rays into the inner barrel, and the height of the clothes and the height of water level are judged through the reflection time and/or the reflectivity of the light rays;

The photoelectric sensor emits a plurality of light beams into the inner barrel at the same time, and the washing machine calculates the height corresponding to each light beam relative to the bottom of the inner barrel according to the reflection time of the plurality of light beams to form a height data group;

When the washing machine does not feed water, the washing machine excludes the height value close to zero in the height data set, and takes the average value of the rest height values as the initial clothing height;

The washing machine further comprises a weighing device for weighing the weight of the clothes in the inner tub, and the washing machine judges whether the clothes are suitable for selecting the water inlet level according to the height of the clothes through the initial height of the clothes and the weight of the clothes;

A corresponding preset height interval is preset for a certain clothes weight, when the initial clothes height exceeds the preset height interval, the washing machine judges that the clothes are not suitable for selecting the water inlet level according to the height, and the washing machine selects the water level corresponding to the clothes weight to control water inlet; when the initial clothes height is within the preset height interval, the washing machine judges that the clothes are suitable for selecting the water inlet level according to the clothes height, and the washing machine selects the water level corresponding to the initial clothes height to control water inlet.

2. The control method of a washing machine according to claim 1, wherein when the height data set includes a plurality of similar height values, the washing machine takes an average value of the plurality of similar height values as a water surface height and takes an average value of other height values in the height data set as a laundry height.

3. The control method of a washing machine according to claim 2, wherein when the height data set has a height value close to zero, the washing machine calculates the average value after excluding the height value close to zero.

4. The control method of a washing machine according to claim 1, wherein the washing machine excludes a plurality of similar height values during water intake of the washing machine, and takes an average value of the remaining height values as the real-time laundry height.

5. The control method of a washing machine according to claim 1, wherein the washing machine sets a warning water level according to a laundry weight when the washing machine judges that laundry is suitable for selecting the water intake level according to the laundry height, and controls the water intake to be stopped when the real-time water level exceeds the warning water level when the washing machine is water intake according to the laundry height.

6. The control method of a washing machine as claimed in claim 4, wherein the washing machine obtains a real-time water level when the real-time laundry level does not exceed the initial laundry level during the water intake, and controls the water intake to be stopped when the real-time water level exceeds the real-time laundry level.

7. The control method of the washing machine as claimed in claim 6, wherein the washing machine judges that the laundry is in a floating state and controls the pulsator to rotate when the real-time laundry height exceeds the initial laundry height;

When the real-time clothes height is not higher than the initial clothes height after the pulsator rotates, the washing machine controls water inlet to stop when the water level height exceeds the real-time clothes height or when the real-time water level height exceeds the real-time clothes height by a certain distance h 1;

when the real-time clothes height is still higher than the initial clothes height after the pulsator rotates, the washing machine controls water inlet to stop after the real-time clothes height exceeds the initial clothes height by a certain distance.

8. The control method of a washing machine as claimed in claim 6, wherein the washing machine selects the water intake level according to the laundry height during the washing course, and the washing machine selects the water intake level according to the laundry weight/laundry height during the rinsing course.

9. The control method of a washing machine according to claim 8, wherein the washing machine controls water inflow to be stopped when the real-time water level exceeds the real-time laundry level by a certain distance h1 during a washing process, and controls water inflow to be stopped when the real-time water level exceeds the real-time laundry level by a certain distance h2 during a rinsing process, h2 > h1.

10. The control method of a washing machine as claimed in claim 1, wherein the washing machine judges a source of the reflected light according to a reflectivity of the light, and calculates the laundry height/water level height by a reflection time of the light.

11. The method according to claim 10, wherein the washing machine is preset with a first reflectance interval and a second reflectance interval, and the washing machine judges that the light is reflected from the water surface when the reflectance of the light falls within the first reflectance interval, and judges that the light is reflected from the laundry when the reflectance of the light falls within the second reflectance interval.

12. A washing machine having a control method as claimed in any one of claims 1 to 11, wherein the washing machine has a photosensor for detecting the height of laundry and the height of water level in the inner tub.

13. The washing machine as claimed in claim 12, wherein the washing machine has an upward laundry putting opening, an upper cover is provided at the laundry putting opening, and a photoelectric sensor is provided at a side of the upper cover facing the inner tub.