CN111593531B

CN111593531B - Water level control method for washing machine

Info

Publication number: CN111593531B
Application number: CN202010480248.8A
Authority: CN
Inventors: 胡波清
Original assignee: Guangdong Lanshuihua Intelligent Electronic Co ltd
Current assignee: Guangdong Lanshuihua Intelligent Electronic Co ltd
Priority date: 2020-05-30
Filing date: 2020-05-30
Publication date: 2023-05-12
Anticipated expiration: 2040-05-30
Also published as: CN111593531A

Abstract

The invention belongs to the technical field of washing machines, and particularly relates to a water level control method of a washing machine, which comprises the following steps: acquiring water supply and drainage instruction information and target water level height information of the washing machine, wherein the water supply and drainage instruction information comprises a water supply instruction and a drainage instruction, the water supply instruction is used for controlling the washing machine to supply water into a water containing barrel of the washing machine, and the drainage instruction is used for controlling the water containing barrel of the washing machine to drain water to the outside of the washing machine; acquiring absolute water level height information in a water bucket of the washing machine; comparing the absolute water level information in the water containing bucket with the target water level information, judging whether the absolute water level information in the water containing bucket is not smaller than the target water level information, and if so, generating a water supply and drainage stop instruction. The invention realizes the accurate control of the water level in the washing process according to the absolute water level height information in the water containing barrel of the washing machine.

Description

Water level control method for washing machine

Technical Field

The invention belongs to the technical field of washing machines, and particularly relates to a water level control method of a washing machine.

Background

When the water level of the washing machine is controlled, a pressure detection sensor is usually arranged in the washing machine to detect the pressure in the water containing barrel of the washing machine, and then the pressure is converted into the water level, so that the water level in the washing machine is obtained, and water supply and drainage of the washing machine are controlled according to the water level.

However, the water level in the water tub of the washing machine which can be detected by the current washing machine is affected by atmospheric pressure, for example, when the washing machine is used on thirty floors, the atmospheric pressure of the thirty floors is greatly different from the atmospheric pressure of one floor, and the pressure in the water tub of the washing machine which is detected by the washing machine does not exclude the pressure caused by the water level after the atmospheric pressure is interfered, so that the detected pressure is converted into the water level height by the washing machine and then has great deviation from the actual water level height, and further, the technical problem that the water level of the washing machine cannot be accurately controlled in the subsequent washing process is caused. Therefore, it is necessary to design a water level control method of a washing machine.

Disclosure of Invention

The invention aims to provide a water level control method of a washing machine, which aims to solve the technical problem that the water level cannot be accurately controlled in the washing process because the acquired water level is easily influenced by atmospheric pressure in the working process of the washing machine in the prior art.

To achieve the above object, an embodiment of the present invention provides a water level control method of a tub of a washing machine, the method including:

acquiring water supply and drainage instruction information and target water level height information of the washing machine, wherein the water supply and drainage instruction information comprises a water supply instruction and a drainage instruction, the water supply instruction is used for controlling the washing machine to supply water into a water containing barrel of the washing machine, and the drainage instruction is used for controlling the water containing barrel of the washing machine to drain water to the outside of the washing machine;

Acquiring absolute water level height information in a water bucket of the washing machine;

comparing the absolute water level information in the water containing barrel with the target water level information, judging whether the absolute water level information in the water containing barrel is not smaller than the target water level information, and if yes, generating a water supply and drainage stop instruction, wherein the water supply and drainage stop instruction comprises a water supply stop instruction and a drainage stop instruction, the water supply stop instruction is used for controlling the washing machine to stop supplying water into the water containing barrel, and the drainage stop instruction is used for controlling the washing machine to stop draining water to the outside of the washing machine.

In order to achieve the above object, an embodiment of the present invention further provides a method for controlling a water level of a tub of a washing machine, the method being based on a water level control system of the tub of the washing machine, the water level control system of the tub of the washing machine including a main board control device of the washing machine and a detection sensor for the washing machine, which are sequentially connected; the water level control method of the water tub of the washing machine includes:

acquiring water supply and drainage instruction information and target water level height information of the washing machine through the main board control device of the washing machine, wherein the water supply and drainage instruction information comprises a water supply instruction and a drainage instruction, the water supply instruction is used for controlling the washing machine to supply water into a water bucket of the washing machine, and the drainage instruction is used for controlling the water bucket of the washing machine to drain water to the outside of the washing machine;

Acquiring absolute water level height information in a water holding barrel of the washing machine through the detection sensor for the washing machine;

comparing the absolute water level information in the water containing barrel with the target water level information through the detection sensor for the washing machine, judging whether the absolute water level information in the water containing barrel is not smaller than the target water level information and sending the information to the main board control device of the washing machine, and if so, generating a water supply and drainage stop instruction through the detection sensor for the washing machine, wherein the water supply and drainage stop instruction comprises a water supply stop instruction and a drainage stop instruction, the water supply stop instruction is used for controlling the main board control device of the washing machine to stop water supply to the water containing barrel, and the drainage stop instruction is used for controlling the washing machine to stop water drainage to the outside of the washing machine.

The above technical solutions in the water level control method for a washing machine provided by the embodiments of the present invention have at least one of the following technical effects: the invention firstly obtains the water supply and drainage instruction information and the target water level height information of the washing machine, thereby controlling the washing machine to supply water into the water containing barrel of the washing machine or controlling the water containing barrel of the washing machine to drain water to the outside of the washing machine; acquiring absolute water level height information in a water holding barrel of the washing machine; and finally, comparing the absolute water level height information in the water containing barrel with the target water level height information, and generating a water supply and drainage stopping instruction when judging that the absolute water level height information in the water containing barrel is not smaller than the target water level height information, so as to control the washing machine to stop supplying water into the water containing barrel or control the washing machine to stop draining water to the outside of the washing machine, thereby realizing accurate control of the water level in the washing process according to the absolute water level height information in the water containing barrel of the washing machine.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of the overall structure of a detection sensor for a washing machine according to an embodiment of the present invention;

fig. 2 is an exploded view of a detection sensor for a washing machine according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a detecting sensor for a washing machine according to an embodiment of the present invention;

FIG. 4 is a schematic view of another view structure of FIG. 3;

fig. 5 is a schematic cross-sectional view of a housing of a detection sensor for a washing machine according to an embodiment of the present invention;

fig. 6 is a schematic view of the whole structure of a pressure conductive elastic membrane of a detection sensor for a washing machine according to an embodiment of the present invention;

FIG. 7 is a schematic view showing another view angle structure of the pressure conductive elastic membrane of the detecting sensor for the washing machine of FIG. 6;

FIG. 8 is a schematic view showing the overall structure of a pressure conductive elastic membrane of a detection sensor for a washing machine according to another embodiment of the present invention;

FIG. 9 is a schematic view of a cross-sectional view of a pressure conductive elastic membrane of the detecting sensor for the washing machine of FIG. 8;

fig. 10 is a cross-sectional view of a pressure conductive elastic membrane of a sensing sensor for a washing machine according to another embodiment of the present invention;

fig. 11 is a cross-sectional view of a pressure conductive elastic membrane of a sensing sensor for a washing machine according to another embodiment of the present invention;

fig. 12 is a schematic cross-sectional view of a detecting sensor for a washing machine according to another embodiment of the present invention;

fig. 13 is a schematic cross-sectional view of a housing of a detecting sensor for a washing machine according to another embodiment of the present invention;

fig. 14 is a schematic circuit diagram of a detection circuit of a detection sensor for a washing machine according to an embodiment of the present invention;

fig. 15 is a circuit block diagram of a detection circuit of a detection sensor for a washing machine according to an embodiment of the present invention;

FIG. 16 is a schematic circuit diagram of a water pressure and temperature detecting circuit of a detecting circuit according to another embodiment of the present invention;

fig. 17 is a circuit block diagram of a detection circuit of a detection sensor for a washing machine according to another embodiment of the present invention;

fig. 18 is a flowchart of a method for controlling a water level of a tub of a washing machine according to an embodiment of the present invention;

fig. 19 is a flowchart of step S200 of a water level control method of a tub of a washing machine according to an embodiment of the present invention;

Fig. 20 is a flowchart of step S210 of a water level control method of a tub of a washing machine according to an embodiment of the present invention;

fig. 21 is a flowchart after step S213 of the water level control method of the tub of the washing machine according to the embodiment of the present invention;

fig. 22 is a flowchart after step S220 of a water level control method of a tub of a washing machine according to an embodiment of the present invention;

fig. 23 is a flowchart after step S200 of a water level control method of a tub of a washing machine according to an embodiment of the present invention;

fig. 24 is a flowchart of step S420 of a water level control method of a tub of a washing machine according to an embodiment of the present invention;

fig. 25 is a block diagram illustrating a structure of a water level control system of a tub of a washing machine according to an embodiment of the present invention;

fig. 26 is an application scenario diagram of a water level control system for a tub of a washing machine according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended to illustrate embodiments of the invention and should not be construed as limiting the invention.

In one embodiment of the present invention, as shown in fig. 18, there is provided a water level control method of a tub of a washing machine, the method including the steps of:

step S100: acquiring water supply and drainage instruction information and target water level height information of the washing machine, wherein the water supply and drainage instruction information comprises a water supply instruction and a drainage instruction, the water supply instruction is used for controlling the washing machine to supply water into a water containing barrel of the washing machine, and the drainage instruction is used for controlling the water containing barrel of the washing machine to drain water to the outside of the washing machine;

specifically, in this step, when a user uses the washing machine to wash clothes, the power supply of the washing machine is turned on first, then the washing mode is set, and different washing modes have different water supply instructions and target water level height, so that the washing machine obtains the water supply instructions and the target water level height information, and then water is supplied into the water containing barrel of the washing machine according to the water discharge instructions until the water level height in the water containing barrel of the washing machine is consistent with the target water level height information. Similarly, when the washing machine is used for dewatering, the washing machine can acquire a drainage instruction and target water level height information, and drain water in the water containing barrel of the washing machine according to the drainage instruction, wherein the water level height in the water containing barrel of the washing machine is consistent with the target water level height information.

Step S200: acquiring absolute water level height information in a water bucket of the washing machine;

specifically, in this step, the absolute water level information in the tub is only water level information converted from pressure caused by water in the tub of the washing machine, and the influence of atmospheric pressure on the water level is eliminated.

Step S300: comparing the absolute water level information in the water containing barrel with the target water level information, judging whether the absolute water level information in the water containing barrel is not smaller than the target water level information, and if yes, generating a water supply and drainage stop instruction, wherein the water supply and drainage stop instruction comprises a water supply stop instruction and a drainage stop instruction, the water supply stop instruction is used for controlling the washing machine to stop supplying water into the water containing barrel, and the drainage stop instruction is used for controlling the washing machine to stop draining water to the outside of the washing machine.

Specifically, in this step, when the absolute water level value in the tub contained in the absolute water level information in the tub reaches only the target water level value contained in the target water level information, meaning that the water discharge or water supply has reached the target, the water supply stop instruction or water discharge stop instruction is generated to stop the water supply into the tub or the water discharge to the outside of the washing machine.

Thus, the invention firstly obtains the water supply and drainage instruction information and the target water level height information of the washing machine, thereby controlling the washing machine to supply water into the water containing barrel of the washing machine or controlling the water containing barrel of the washing machine to drain water to the outside of the washing machine; acquiring absolute water level height information in a water holding barrel of the washing machine; and finally, comparing the absolute water level height information in the water containing barrel with the target water level height information, and generating a water supply and drainage stopping instruction when judging that the absolute water level height information in the water containing barrel is not smaller than the target water level height information, so as to control the washing machine to stop supplying water into the water containing barrel or control the washing machine to stop draining water to the outside of the washing machine, thereby realizing accurate control of the water level in the washing process according to the absolute water level height information in the water containing barrel of the washing machine.

In another embodiment of the present invention, as shown in fig. 19, the step S200: the method for acquiring the absolute water level height information in the water bucket of the washing machine specifically comprises the following steps:

step S210: acquiring external atmospheric pressure information outside the washing machine;

in this step, the external atmospheric pressure information is an atmospheric pressure of a space outside a region of the tub of the washing machine covered by water in the tub of the washing machine.

Step S220: acquiring actual water holding barrel pressure information in a water holding barrel of the washing machine, wherein the actual water holding barrel pressure information comprises the external atmospheric pressure information and actual water holding barrel water level pressure information;

specifically, in this step, the actual tub pressure information is a pressure caused by the water in the tub of the washing machine together with the atmospheric pressure outside the area occupied by the water in the tub of the washing machine, so the actual tub pressure information includes the external atmospheric pressure information and the actual tub water level pressure information. The actual water level pressure information of the water containing barrel is the pressure brought by water in the water containing barrel of the washing machine.

Step S230: acquiring the actual water bucket water level pressure information according to a difference value between the actual water bucket pressure information and the external atmospheric pressure information;

specifically, the external atmospheric pressure information is removed by subtracting the external atmospheric pressure information from the actual tub pressure information, and the actual tub water level pressure information is obtained.

Step S240: and obtaining the absolute water level height information in the water holding barrel through pressure water level conversion calculation according to the actual water holding barrel water level pressure information.

Specifically, in this step, the absolute water level information in the water tub is a water level value converted from the pressure after the interference caused by the atmospheric pressure is eliminated, so that the absolute water level information in the water tub can more accurately reflect the height of water in the water tub of the washing machine, thereby laying a foundation for accurately controlling the water level during the subsequent washing of the washing machine, and ensuring the high efficiency and accuracy of controlling the water level during the washing of the washing machine.

In another embodiment of the present invention, as shown in fig. 20, the step S210: the acquiring external atmospheric pressure information outside the washing machine specifically includes:

step S211: acquiring washing machine drainage information after the washing machine is electrified, wherein the washing machine drainage information is used for controlling a drainage valve of the washing machine to be opened so as to drain water in a water holding barrel by the washing machine;

in this embodiment, the method for obtaining the information of the external atmospheric pressure information is to empty water in the water tub of the washing machine when the washing machine is started, and the pressure information that can be detected at this time is the pressure caused by the atmospheric pressure. Specifically, in the step, a user starts a power supply to supply power to the washing machine, the washing machine is electrified, the washing machine obtains the drainage information of the washing machine, and according to the drainage information of the washing machine, a drainage valve of the washing machine is opened to start draining water in a water containing barrel of the washing machine.

Step S212: acquiring pressure information of a water holding barrel in water draining in a water holding barrel of the washing machine in a water draining process in real time, wherein each time point in the water draining process corresponds to one pressure information of the water holding barrel in water draining;

in the step, through detecting the pressure information of the water holding barrel in the water holding barrel of the washing machine in the water holding process, whether the water in the water holding barrel of the washing machine is emptied or not is conveniently judged.

Step S213: judging whether the pressure information of the water holding bucket in each drainage in the drainage process changes in real time, and if the pressure information of the water holding bucket in each drainage is judged to be unchanged and continuously exceeds the preset drainage finishing time, setting the current pressure information of the water holding bucket in the drainage as the external atmospheric pressure information.

After normal water draining is completed, only atmospheric pressure remains in the washing machine tub, so that the atmospheric pressure in the washing machine tub should be kept unchanged continuously. Therefore, when the pressure information of the water draining tub is kept unchanged and the preset water draining completion time is exceeded, the water in the water draining tub of the washing machine is drained, and the obtained pressure information of the water draining tub is the external atmospheric pressure information, namely the current pressure information of the water draining tub is set as the external atmospheric pressure information.

Further, the draining completion time is set according to actual demands by one of ordinary skill in the art. If the draining completion time is set to be 1 minute, when the draining process is completed, after the pressure information of the water holding barrel in the draining process is kept unchanged and lasts for 1 minute, the draining is judged to be completed at this time, and the pressure information of the water holding barrel in the draining at this time is set to be the external atmospheric pressure information.

In another embodiment of the present invention, as shown in fig. 21, in the step S213: the defining the current pressure information of the water containing barrel in the drainage as the external atmospheric pressure information further comprises the following steps:

step S214: acquiring empty bucket pressure information in the water bucket in real time, wherein each time point in the acquisition process corresponds to one empty bucket pressure information respectively;

specifically, when the washing machine is not in use, i.e., the washing machine empties the water in the tub, the external atmospheric pressure is changed in real time. At this time, therefore, it is necessary to learn to update the current barometric pressure value in real time. Specifically, the empty bucket pressure information in the water bucket is acquired in real time through detection, so that the atmospheric pressure information is updated for the subsequent real time.

Step S215: judging whether the change of the pressure information of each empty barrel exceeds a preset pressure change value within a preset time period; if yes, setting the changed empty barrel pressure information as the external atmospheric pressure information;

In this step, the preset pressure variation value is set to 80pa, and the preset period of time is set to 30 seconds. When the pressure change of the empty bucket pressure information exceeds 80pa in the process of continuously acquiring the empty bucket pressure information in the water bucket within 30 seconds, the change can be judged to be air pressure fluctuation, the empty bucket pressure information detected at the latest moment in the preset time period is updated to be the latest external atmospheric pressure information, and the empty bucket pressure information after the change is set to be the external atmospheric pressure information.

Thus, the real-time learning and updating of the atmospheric pressure information are realized. In the process of eliminating the influence of the atmospheric pressure information on the water level control of the washing machine, the accuracy of acquiring the atmospheric pressure information is further improved, so that the pressure value brought by the atmospheric pressure is ensured to be accurately removed, and the accuracy and the precision of acquiring the absolute water level height information in the water holding barrel are further improved, so that the accuracy and the intelligence of the washing machine on the water level control are improved.

In another embodiment of the present invention, the step S210: the acquiring external atmospheric pressure information outside the washing machine specifically includes:

And acquiring the external atmospheric pressure information through an external detection circuit, wherein the detection end of the external detection circuit is positioned outside the water containing barrel of the washing machine.

Specifically, in this step, an external detection circuit is provided, and the detection end of the external detection circuit is located outside the water tub of the washing machine, so that another method for acquiring the external atmospheric pressure information in real time without draining water in the water tub of the washing machine is provided.

In another embodiment of the present invention, the pressure water level transition calculation is based on the following formula:

wherein h is the absolute water level height information in the water containing barrel, P _Measuring For the actual water containing barrel pressure information, P _{Air flow} For the external barometric pressure information ρ=1000 kg/m ³ ，g＝9.8m/s ² 。

In particular, the pressure of water is related to the high density of water and the acceleration of gravity. Setting h to represent the height of water in the water tub of the washing machine, ρ to represent the density of water, g to represent the gravitational acceleration, P _{Water and its preparation method} Pressure brought by water in water tub of washing machine, namely P _{Water and its preparation method} And the actual water level pressure information of the water containing barrel is obtained.

Further, from the actual tub pressure information including the external atmospheric pressure information and the actual tub water level pressure information, it is known that: p (P) _Measuring ＝P _{Air flow} +P _{Water and its preparation method} ；

And P is _{Water and its preparation method} ＝ρhg；

Namely: p (P) _Measuring ＝P _{Air flow} +ρhg；

When the actual tub pressure information and the external atmospheric pressure information are calculated as a difference value, it is possible to obtain:

thus, h can be calculated to obtain the absolute water level height information in the water bucket.

In another embodiment of the present invention, as shown in fig. 22, after the step S220, and after the acquiring of the actual tub pressure information in the tub of the washing machine, further includes:

step S221: obtaining pressure variation speed information of the actual water holding barrel pressure information according to the actual water holding barrel pressure information;

specifically, when the washing machine starts to drain, drainage may fail due to external factors, such as a tap connected to a drain valve of the washing machine to supply water to the washing machine is not opened, thereby causing drainage failure. Therefore, the pressure change speed information of the actual water containing bucket pressure information is obtained by calculating the change speed of the actual water containing bucket pressure information according to the actual water containing bucket pressure information in the time occupied by the water discharging process, so as to judge whether water is normally fed or not.

Step S222: comparing and analyzing the pressure change speed information with preset normal water supply and drainage speed information, and if the pressure change speed information is not matched with the normal water supply and drainage speed information, generating a water supply and drainage abnormal instruction which is used for controlling the washing machine to send out water supply and drainage abnormal warning.

Specifically, taking a case of normally supplying water into the tub of the washing machine as an example, since the water in the tub is gradually increased, the pressure in the tub of the washing machine should be gradually increased, and as the water supply is increased, the detected rate of change of the actual tub pressure information should be gradually increased, i.e., the actual tub pressure information should be increased at a faster increasing rate. If not, it is indicated that the water supply is problematic at this time. Likewise, the same is true of drainage.

Therefore, when the pressure change speed information is not matched with the normal water supply and drainage change speed information, the water supply or drainage abnormality is indicated at the moment, the water supply and drainage abnormality instruction is further generated, and the washing machine is controlled to send out a water supply and drainage abnormality warning through the water supply and drainage abnormality instruction.

Further, the water supply and drainage abnormality warning includes, but is not limited to, warning a user of the water supply and drainage abnormality by sounding a buzzer provided on the washing machine.

In another embodiment of the present invention, as shown in fig. 23, the step S200: the method for acquiring the absolute water level height information in the water bucket of the washing machine further comprises the following steps:

step S410: acquiring a heating instruction and target heating temperature information of the washing machine, wherein the heating instruction is used for controlling the washing machine to heat water in the water containing barrel;

In cold weather, users often have a need for warm water washing when using the washing machine. Thus, when receiving the heating command of the washing machine and acquiring the target heating temperature information, the washing machine starts to control the washing machine to heat.

The target heating information is a temperature which is set by a user and reached after water is heated, for example, the target heating temperature information is set to be 40 ℃.

Step S420: acquiring actual water temperature information in a water bucket of the washing machine in real time;

step S430: comparing the actual water temperature information with the target heating temperature information, judging whether the actual water temperature information is matched with the target heating temperature information, and if so, generating a heating stop instruction which is used for controlling the washing machine to stop heating water in the water bucket.

Specifically, by acquiring the actual water temperature information in the tub of the washing machine in real time, the actual temperature information can be compared with the target heating temperature information in real time. And judging whether the actual water temperature information is matched with the target heating temperature information or not after the actual water temperature information reaches the target heating temperature information. At this time, it is explained that the water has been heated to a desired temperature, so at this time, the washing machine is controlled to stop heating the water of the tub by generating the heating stop command.

In another embodiment of the present invention, as shown in fig. 24, the step S420: the real-time acquisition of the actual water temperature information in the water bucket of the washing machine further comprises the following steps:

step S421: obtaining temperature change information of the actual water temperature information according to the actual water temperature information;

step S422: comparing and analyzing the temperature change information with preset normal heating temperature change information, and if the temperature change information is not matched with the normal heating temperature change information, generating a temperature heating abnormal instruction which is used for controlling the washing machine to send out a temperature heating abnormal warning.

When the water is heated normally, the water temperature must continuously increase and the temperature change information must be increased at a faster rate along with the heating. If not, a heating abnormality is described.

Therefore, in this step, the actual water temperature information is acquired, and the temperature change information of the actual water temperature information is calculated for each piece of the actual water temperature information. And when the temperature change information is matched with the normal heating temperature change information, indicating that the heating device is in the normal heating process. And when the temperature change information is not matched with the normal heating temperature change information, the abnormal heating is indicated, so that the abnormal heating temperature instruction is generated, and the washing machine is controlled to send out abnormal heating temperature warning.

Further, the abnormal temperature heating warning can be sounded normally through a buzzer arranged on the washing machine so as to remind a user of treating abnormal water supply and drainage.

In another embodiment of the present invention, as shown in fig. 1 to 25, there is also provided a method of controlling a water level of a tub of a washing machine, which is performed based on a water level control system of the tub of the washing machine.

Specifically, the water level control system of the tub of the washing machine includes a main board control device 800 of the washing machine and a detection sensor for the washing machine, which are sequentially connected.

Based on the washing machine tub water level control system, the washing machine tub water level control method includes:

the step S100 specifically includes: acquiring water supply and drainage instruction information and target water level height information of the washing machine through the washing machine main board control device 800, wherein the water supply and drainage instruction information comprises a water supply instruction and a drainage instruction, the water supply instruction is used for controlling the washing machine to supply water into a water bucket of the washing machine, and the drainage instruction is used for controlling the water bucket of the washing machine to drain water to the outside of the washing machine;

the step S300 specifically includes: acquiring absolute water level height information in a water holding barrel of the washing machine through the detection sensor for the washing machine;

The step S400 specifically includes: comparing the absolute water level information in the water containing barrel with the target water level information through the detection sensor for the washing machine, judging whether the absolute water level information in the water containing barrel is not smaller than the target water level information and sending the information to the main board control device of the washing machine, and if so, generating a water supply and drainage stop instruction through the detection sensor for the washing machine, wherein the water supply and drainage stop instruction comprises a water supply stop instruction and a drainage stop instruction, the water supply stop instruction is used for controlling the main board control device of the washing machine to stop water supply to the water containing barrel, and the drainage stop instruction is used for controlling the washing machine to stop water drainage to the outside of the washing machine.

In another embodiment of the present invention, as shown in fig. 25 to 26, the main board control device 800 of the washing machine comprises a main board 180 of the washing machine, a water inlet valve 820, a water outlet valve 830 and a heating device 840; the main control board 180 of the washing machine is connected with the detection sensor for the washing machine, and the water inlet valve 820, the water outlet valve 830 and the heating device 840 are all connected with the main control board of the washing machine.

Further, referring to fig. 26, in the present embodiment, 880 is a detection sensor for a washing machine, 870 is a tub for a washing machine, and 860 is a tub for a washing machine when the water level control system for a tub for a washing machine is applied. The detection end of the detection sensor 880 for the washing machine is in contact with the tub 860, and is detected by the detection sensor 880 for the washing machine when water is present in the tub 860.

The following describes a specific structure of the detection sensor for a washing machine described in the present application:

as shown in fig. 1 to 17, there is provided a detection sensor for a washing machine, including a housing 300, a pressure conductive elastic membrane 200, a pressure conductive medium 400, and a pressure detection PCB 500.

The bottom of the housing 300 is provided with a bottom opening 310, the top of the housing 300 is provided with an upper opening 320, and the pressure conductive elastic membrane 200, the pressure conductive medium 400 and the pressure detection PCB 500 are sequentially installed in the housing 300 from the upper opening 320. The pressure intensity conductive elastic membrane 200 is installed in the shell 300 and is sealed in the bottom opening 310, the pressure intensity conductive medium 400 is accommodated in the shell 300 and is pressed and covered by the pressure intensity conductive elastic membrane 200, the pressure intensity detection PCB 500 is installed in the shell 300 and is pressed and covered by the pressure intensity conductive medium 400, and the detection end of the pressure intensity detection PCB 500 stretches into the pressure intensity conductive medium 400, so that the external pressure intensity is conducted to the detection end of the pressure intensity detection PCB 500 after passing through the pressure intensity conductive elastic membrane 200 and the pressure intensity conductive medium 400 in sequence, and the pressure intensity detection PCB 500 detects the external pressure intensity.

According to the invention, the shell 300, the pressure conductive elastic membrane 200, the pressure conductive medium 400 and the pressure detection PCB 500 are arranged, the pressure conductive medium 400 is contained in the shell, the pressure detection PCB 500 is arranged in the shell 300 and is arranged to cover the pressure conductive medium 400, and the detection end of the pressure detection PCB 500 is arranged to extend into the pressure conductive medium 400, so that when the external pressure is detected, the external pressure can be sequentially transmitted to the detection end of the pressure detection PCB 500 after passing through the pressure conductive elastic membrane 200 and the pressure conductive medium 400, and then the pressure detection PCB 500 detects the external pressure.

In another embodiment of the present invention, as shown in fig. 2 to 5, the periphery of the bottom of the housing 300 extends toward the center of the bottom opening 310 to form an elastic membrane mounting portion 330, and the periphery of the pressure-transmitting elastic membrane 200 is connected to the elastic membrane mounting portion 330. The elastic membrane mounting part 330 is used for conveniently mounting the pressure conductive elastic membrane 200. After the installation, the bottom surface of the periphery of the pressure conductive elastic membrane 200 contacts with the top surface of the elastic membrane installation portion 330 and is tightly connected with the top surface by external force, so as to achieve the purpose of sealing the bottom opening 310 by the pressure conductive elastic membrane 200. Meanwhile, due to the elastic arrangement of the pressure conductive elastic membrane 200, when the pressure conductive elastic membrane 200 is tightly connected with the elastic membrane mounting portion 330 by external force, the periphery of the pressure conductive elastic membrane 200 is elastically deformed, so that the tight connection of the pressure conductive elastic membrane 200 and the elastic membrane is realized under the action of external force, and the tightness of the pressure conductive elastic membrane 200 after the bottom opening is sealed is ensured, thereby realizing the dual effects of connection and sealing. Specifically, the external force in this embodiment may be selected by a person skilled in the art according to actual needs, such as an adhesive or a pressing member, to press the pressure-conducting elastic membrane 200 onto the elastic membrane mounting portion 330, so as to connect the periphery of the pressure-conducting elastic membrane 200 with the elastic membrane mounting portion 330 by using the adhering force or the pressing force of the adhesive.

In another embodiment of the present invention, as shown in fig. 5, the elastic membrane mounting portion 330 includes a receiving platform 331, and the periphery of the receiving platform 331 is curled inward toward the housing 300 to form a fixing rib 332, and an inner surface of the fixing rib 332 is fitted to the periphery of the pressure-conducting elastic membrane 200. The upper surface of the receiving platform 331 is planar, the pressure conductive elastic film 200 is directly disposed on the receiving platform 331 when the pressure conductive elastic film 200 is mounted, the bottom surface of the periphery of the pressure conductive elastic film 200 is attached to the upper end surface of the receiving platform 331, and then the two are pressed together by external force. After pressing, the inner surface of the fixing rib 332 is attached to the periphery of the pressure-conducting elastic membrane 200, so that not only the upper end surface of the receiving platform 331 contacts with the portion of the pressure-conducting elastic membrane 200 that is elastically deformed, but also the inner surface of the fixing rib of the pressure-conducting elastic membrane 200 contacts, thereby increasing the contact area between the pressure-conducting elastic membrane 200 and the elastic membrane mounting portion 330, and improving the sealing performance in a manner of two portions simultaneously and tightly contacting.

In another embodiment of the present invention, as shown in fig. 2 to 4, the detecting sensor for a washing machine further includes an elastic membrane pressing member 600, and the elastic membrane pressing member 600 is installed in the housing 300; the middle part of the elastic membrane pressing member 600 is provided with a clearance hole 610 for keeping away the pressure conductive elastic membrane 200, and the bottom surface of the periphery of the elastic membrane pressing member 600 is pressed against the top surface of the periphery of the pressure conductive elastic membrane 200, so that the bottom surface of the periphery of the pressure conductive elastic membrane 200 is attached to the receiving platform 331 and the fixing rib 332. The clearance hole 610 is used to not affect the conduction of pressure from the outer edge of the pressure conductive elastic membrane 200 into the housing 300. The periphery of the elastic membrane pressing piece 600 is pressed on the top surface of the periphery of the pressure conducting elastic membrane 200, so that the pressure conducting elastic membrane 200 is in contact with the periphery of the elastic membrane pressing piece 600, and the pressure conducting elastic membrane 200 is fixed on the premise that the function of pressure conducting of the pressure conducting elastic membrane 200 is not affected, the structural design is ingenious, and the bottom surface of the periphery of the pressure conducting elastic membrane 200 is attached to the bearing platform 331 and the fixing ribs 332 after pressing, so that the tightness is ensured.

In another embodiment of the present invention, as shown in fig. 2 and 4, a pressing member mounting portion 340 matching with the elastic membrane pressing member 600 is provided at the bottom of the housing 300, so that the elastic membrane pressing member 600 is engaged in the pressing member mounting portion 340. In this embodiment, the side wall at the bottom of the housing 300 is concave inward toward the housing 300 to form the pressing member mounting portion 340, and the pressing member mounting portion 340 is matched with the elastic membrane pressing member 600, so that when the elastic membrane pressing member 600 is mounted on the pressing member mounting portion 340 by an external force, the elastic membrane pressing member 600 is just clamped in the housing 300 and fixes the pressure conducting elastic membrane 200, so that the pressure conducting elastic membrane 200 is elastically deformed, and the bottom and the side surfaces of the periphery of the pressure conducting elastic membrane are respectively attached to the receiving platform 331 and the fixing rib 332.

In another embodiment of the present invention, the elastic membrane pressing member 600 includes an annular pressing plate 620, the circumferential edge of the annular pressing plate 620 extends in a direction perpendicular to the annular pressing plate 620 to form a tight-fitting column 630, the bottom surface of the tight-fitting column 630 abuts against the receiving platform 331, and the outer side of the tight-fitting column 630 is tightly connected with the inner surface of the pressing member mounting portion 340. In this embodiment, the area and shape of the annular pressing plate 620 are matched with the area and shape of the periphery of the pressure conducting elastic membrane 200, so that the annular pressing plate 620 is just pressed on the periphery of the pressure conducting elastic membrane 200, and thus the pressure conducting effect of the pressure conducting elastic membrane 200 is not affected when the pressure conducting elastic membrane 200 is fixed. In addition, the bottom surface of the close-fit column 630 is abutted to the receiving platform 331, and the outer side of the close-fit column 630 is closely connected to the inner surface of the compressing member mounting portion 340, so that the elastic membrane compressing member 600 can be mounted while other external or liquid can be sealed from penetrating into the housing, and the sealing performance is further improved.

In another embodiment of the present invention, as shown in fig. 6-7, a side of the pressure conducting elastic membrane 210 facing away from the pressure conducting medium 400 is expanded and extended in a direction facing the pressure conducting medium 400 to form a plurality of pressure conducting concave portions 210.

In another embodiment of the present invention, as shown in fig. 8, each of the pressure-transmitting concave portions 210 is provided in a ring shape. When the detection sensor for the washing machine is used, one side surface of the pressure conducting elastic membrane 200 bears the pressure of water in the water tub of the washing machine, and the pressure is conducted to the inside of the shell 300 after being conducted to the other side surface of the pressure conducting elastic membrane 200 through the pressure conducting elastic membrane 200. That is, when water exists in the tub of the washing machine, the pressure of the water acts on each pressure conduction concave portion 210, and by arranging the pressure conduction concave portions 210 in a ring shape, the pressure is conducted to the other side surface of the pressure conduction elastic membrane 200 along the ring shape of the pressure conduction concave portions 210 during pressure conduction, thereby better conducting the pressure brought by the water and further ensuring the accuracy of the subsequent pressure measurement. In this embodiment, each of the pressure conductive concave portions 210 is disposed in a circular ring shape. In this embodiment, the number of pressure conductive dimples 210 is one.

In another embodiment of the present invention, as shown in fig. 6-7, the pressure-transmitting concave portions 210 are each provided in a ring shape at equal intervals. In this way, when the pressure of the water acts on the pressure conduction concave part 210, the water can be uniformly conducted into the shell along the pressure conduction concave part 210, so as to ensure a higher pressure conduction effect. In this embodiment, the number of pressure conductive dimples 210 is two.

In another embodiment of the present invention, the center of each of the pressure-conducting concave portions 210 in the shape of a ring is the same as the center of the pressure-conducting elastic membrane 200. Namely, the center of each pressure conductive concave portion 210 in the ring shape is the center of the pressure conductive elastic membrane 200, so that the stability of the whole structure of the pressure conductive elastic membrane 200 is ensured, the pressure of water is better borne, and the service life is prolonged.

In another embodiment of the present invention, as shown in fig. 6 to 9, each of the pressure-transmitting concave portions 210 is provided in a stepped-down manner from the outer edge of the pressure-transmitting elastic membrane 200 toward the center of the pressure-transmitting elastic membrane 200. That is, from the outer edge of the pressure-transmitting elastic membrane 200 toward the center of the pressure-transmitting elastic membrane, the degree of concavity of each pressure-transmitting concave portion 210 decreases in order, which may be understood that the concave surface of the pressure-transmitting concave portion 210 beside the center of the pressure-transmitting elastic membrane 200 is the lowest surface of the concave surface of each pressure-transmitting concave portion 210. Compared with the planar structure in the prior art, the pressure conduction concave portions 210 are arranged in a stepped descending manner, so that pressure can be transmitted step by step along the pressure conduction concave portions 210 during pressure conduction, and the pressure conduction efficiency is improved. On the other hand, the pressure conductive elastic membrane 200 is formed in a shape that is concave toward the other surface, and when the pressure conductive elastic membrane 200 contacts water, each pressure conductive concave portion 210 has a diversion effect, and in the diversion process, the pressure of the water acts on each pressure conductive concave portion 210 along with diversion, and is further conducted to the other side surface of the pressure conductive elastic membrane 200, so that pressure conduction is realized.

In another embodiment of the present invention, as shown in FIG. 8, the middle portion of the pressure conducting elastomeric membrane 200 extends in the opposite direction of the concavity of the pressure conducting inner recess 210 and forms a middle outer flange 220. That is, the integral structure of the pressure-conducting elastic membrane 200 is not provided with one side inclined to the other side, but the middle outer convex portion 220 opposite to the concave direction of each pressure-conducting concave portion 210 is provided in the middle, so that when water pressure acts on each pressure-conducting concave portion 210, the middle outer convex portion 220 provides an elastic force, thereby ensuring stability of the pressure-conducting elastic membrane 200 when the two sides of the structure are stressed, further ensuring that the pressure-conducting elastic membrane 200 is not deformed due to continuous stress, and improving stability of the integral structure of the elastic membrane. Specifically, the elastic force provided by the middle outer flange 220 is a force that is diffused toward the circumferential direction of the pressure-transmitting elastic membrane 200 toward each of the pressure-transmitting concave portions 210 with the middle outer flange 220 as a center.

In another embodiment of the present invention, as shown in fig. 6 to 7, the pressure conductive elastic membrane 200 is provided with a first protrusion fitting part 230 around the circumference thereof. In this embodiment, the first protruding close-fitting portion 230 is disposed in a ring shape, and when the first protruding close-fitting portion 230 is used for fixing the pressure conducting elastic membrane 200, the elastic membrane pressing member presses the first protruding close-fitting portion 230, so as to seal the bottom opening 310.

In another embodiment of the present invention, as shown in fig. 10, the peripheral edges of both sides of the pressure-conducting elastic membrane 200 extend in a direction away from the pressure-conducting elastic membrane 200 and form a front convex close-fitting portion 241 and a back convex close-fitting portion 242, respectively; the front convex close-fitting portion 241 and the back convex close-fitting portion 242 are symmetrically disposed. In this embodiment, the front protruding close-fitting portion 241 and the back protruding close-fitting portion 242 are arranged in a protruding manner, and the front protruding close-fitting portion 241 and the back protruding close-fitting portion 242 are all arranged elastically, so that when the pressure conductive elastic membrane 200 is fixed by the protruding front protruding close-fitting portion 241 and the back protruding close-fitting portion 242, the front protruding close-fitting portion 241 and the back protruding close-fitting portion 242 are pressed, and the protruding portions of the front protruding close-fitting portion 241 and the back protruding close-fitting portion 242 are elastically deformed, thereby ensuring tightness.

In another embodiment of the present invention, as shown in fig. 11, the periphery of one side of the pressure-conducting elastic membrane 200 extends in a direction away from the pressure-conducting elastic membrane 200 and forms a single-sided convex tight-fitting part 250, and the other side of the pressure-conducting elastic membrane 200 is disposed in a plane. Specifically, the pressure conductive elastic membrane 200 with a planar side surface is convenient to be tightly attached to the receiving platform 331, the other side surface is provided with the single-side protrusion close-fitting part 250 so that the elastic membrane pressing piece 600 is pressed on the single-side protrusion close-fitting part 250 to enable elastic deformation to occur, so that tightness in installation is kept, convenience and sealing of installation are achieved through different double-sided settings, and the pressure conductive elastic membrane is efficient and rapid.

In another embodiment of the present invention, the pressure conductive elastic membrane 200 is made of silica gel, that is, the pressure conductive elastic membrane 200 is made of silica gel with elasticity, and by adopting the silica gel material, the pressure conductive elastic membrane 200 has excellent elasticity, and when the pressure conductive elastic membrane 200 bears pressure, elastic deformation occurs rapidly, so that the obstruction caused by the rigid structure of the detection material itself to the pressure conductive process is greatly alleviated, and further the efficient pressure conductive effect is ensured, thereby realizing accurate measurement of the pressure. Of course, the material of the pressure-conducting elastic membrane 200 may be selected from other materials as long as the above-mentioned pressure-conducting requirement of the pressure-conducting elastic membrane 200 can be met, and the application is not limited in detail.

In addition, this application pressure conductive elastic membrane 200 sets up for integrated into one piece, so, guarantees the high efficiency in the production process, and integrated into one piece sets up to make pressure conductive elastic membrane 200 keeps as a whole, and the structure is more stable, indirectly improves pressure conductive elastic membrane 200's life to provide higher user experience for the user.

In another embodiment of the present invention, the pressure conductive medium 400 is made of silicone oil. Silicone oils have heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and low surface tension, and in addition have a low viscosity-temperature coefficient and high compression resistance. On the one hand, since the silicone oil has compression resistance, it can efficiently transfer the pressure transferred through the pressure conductive elastic film 200 to the pressure detection PCB 500, thereby improving pressure transfer efficiency. On the other hand, silicone oil is also excellent heat transfer oil, so that it can efficiently transfer water temperature by providing the silicone oil as the pressure conductive medium 400, thereby enabling the pressure detection PCB 500 to detect the temperature of water in the tub in the washing machine. In addition, the electrical insulation of the silicone oil enables the detection end of the pressure detection PCB 500 to be immersed in the silicone oil for a long time without damaging the circuit structure on the pressure detection PCB 500, so that the use aging and the service life of the pressure detection PCB 500 are not affected.

In another embodiment of the present invention, the material of the housing 300 is stainless steel. In production, the housing 300 is made of stainless steel after being stretched. Since the treatment process for stainless steel in the prior art is mature, the manufacturing process of the housing 300 can utilize the mature process in the market to reduce the development cost. The housing 300 made of stainless steel has a certain strength, and can ensure the stability of the overall structure of the detection sensor for the washing machine. In addition, the housing 300 made of stainless steel has extremely strong thermal conductivity, thereby ensuring efficient heat conduction when detecting water temperature.

In another embodiment of the present invention, as shown in fig. 1-4, the pressure detecting PCB 500 includes a PCB fixing member 510 and a detecting PCB 520, the detecting PCB is partially clamped on the PCB fixing member 510, and the detecting PCB 520 is partially immersed in the pressure conducting medium 400; the PCB fixing member 510 is installed in the housing 300, and the bottom of the PCB fixing member 510 is attached to the upper end surface of the pressure conductive medium 400. In this embodiment, the PCB fixing member 510 is made of rubber, and the connection between the PCB fixing member 510 and the detection PCB 520 is achieved by low-temperature injection molding. The bottom of the PCB fixing member 510 is attached to the upper end surface of the pressure conducting medium 400, so that the cavity between the PCB fixing member 510 and the pressure conducting elastic membrane 200 is filled with the pressure conducting medium 400 without redundant liquid and gas, thereby ensuring that the external pressure is conducted to the detection PCB 520 after passing through the pressure conducting elastic membrane 200 and then passing through the pressure conducting medium 400, avoiding the pressure conduction due to the influence of redundant substances in the pressure conducting medium 400, ensuring the high efficiency and accuracy of the pressure conduction to the detection PCB 520, and further improving the pressure detection precision.

In another embodiment of the present invention, as shown in fig. 2 to 4, the detecting sensor for a washing machine further includes a fixing member support 530, the fixing member support 530 is erected on the elastic membrane pressing member 600, and the PCB fixing member 510 is mounted on the fixing member support 530. The fixing support 530 is used for fixing the PCB board fixing member 510, and at the same time, the PCB board fixing member 510 is mounted on the fixing member support 530, and the PCB board fixing member 510 gives pressure on the fixing member support 530 and gravity of the fixing member support 530 all fall onto the elastic film pressing member 200, so that the elastic film pressing member 600 is pressed while the PCB board fixing member 510 is fixed, and the practicality is extremely high.

In another embodiment of the present invention, as shown in fig. 2-5, the fixing member support 530 includes a supporting frame 531, and a plurality of supporting columns 532 are disposed at the bottom of the supporting frame 531; the upper surface of the supporting frame 531 contacts with the PCB fixing member 510, and the bottom of the supporting column 532 is pressed on the elastic film pressing member 600. In this embodiment, the supporting frame 531 is in a flat plate shape, and the upper surface of the flat plate shape of the supporting frame 531 contacts and is attached to the PCB fixing member 510, so as to improve the stability of the two relative to each other. The support columns 531 are also arranged at equal intervals to ensure the balance of the overall stress of the fixing member support 530. In addition, each supporting column 532 is disposed in a column shape, and is matched with the flat supporting frame 531, so that the volume occupied by the cavity between the PCB fixing element 510 and the pressure conducting elastic membrane 200 by the fixing element support 530 is reduced while the supporting effect is ensured, so that the cavity between the PCB fixing element 510 and the pressure conducting elastic membrane 200 by the pressure conducting medium 400 occupies a larger volume, and further, the efficiency and stability of the internal and external pressure conduction are ensured.

In another embodiment of the present invention, as shown in fig. 12-13, a partial sidewall of the middle portion of the housing 300 extends toward the outside of the housing 300 to form a fixture mounting table 350, and the fixture mounting table 350 is matched with the PCB board fixture 510 so that the PCB board fixture 510 is mounted on the fixture mounting table 510. In this embodiment, when the PCB fixing member 510 is mounted on the fixing member mounting table 350, the side wall of the PCB fixing member 510 is clamped on the fixing member mounting table 350, so that other fixing structures are not needed, the PCB fixing member 510 can be fixed by processing the housing 300, and the production cost for producing other fixing members is saved while the convenience and the rapidness are also improved.

In another embodiment of the present invention, as shown in fig. 2-5 and fig. 12-13, the PCB fixing member 510 is provided with a plurality of medium guiding holes 511, and the bottom of each medium guiding hole 511 is flared to form a medium flared slot 512. Each of the medium guide holes 511 is used for injecting the pressure conductive medium 400 into a cavity between the PCB board holder 510 and the pressure conductive elastic membrane 200. In actual assembly, the PCB fixing member 510 is first installed in the housing 300, and then the pressure conducting medium 400 is injected through each medium guiding hole 511, and after the pressure conducting medium 400 is fully injected, the cavity between the PCB fixing member 510 and the pressure conducting elastic membrane 200 is vacuumized to extract the redundant gas. In the process of injecting the pressure conducting medium 400, the medium expansion tank is used for accelerating the outflow of the pressure conducting medium 400, improving the liquid injection efficiency and preventing the problem of blockage during liquid injection.

In another embodiment of the present invention, as shown in fig. 2-4, the detecting sensor for a washing machine further includes a silica gel fixing member 700, the silica gel fixing member 700 is disposed in the housing 300 and above the detecting PCB fixing member 510, and the silica gel fixing member 700 is further connected with the detecting PCB 520 and covers a local arrangement of the detecting PCB 520. In this embodiment, the silicone fixing member 700 is made of silicone. After the pressure conducting medium 400 is injected and vacuumized, silica gel is injected into the shell 300, and the silica gel is allowed to stand for a preset time until the silica gel is solidified, so that the silica gel fixing piece 400 is formed, the medium guide hole 512 is plugged after the silica gel fixing piece 400 is solidified, so that the pressure conducting medium 400 is ensured to be positioned in a sealed cavity, and in addition, the silica gel fixing piece 700 is adhered to the PCB fixing piece 510 and the inner side wall of the shell 300 in the solidification process, so that the effect of fixing the silica gel fixing piece in the shell 300 and fixing the PCB fixing piece 510 at the same time is achieved.

In another embodiment of the present invention, as shown in fig. 14-17, a detection circuit is disposed on the detection PCB board, and the detection circuit 100 includes an interface circuit 110, a voltage conversion circuit 120, a main control circuit 130, and a water pressure and temperature detection circuit 140.

Wherein, the interface circuit 110 is connected with a main control board 180 of the washing machine;

the voltage conversion circuit 120 is connected with the interface circuit 110;

the main control circuit 130 is connected with the voltage conversion circuit 120 and the interface circuit 110;

the water pressure and temperature detection circuit 140 is connected to the voltage conversion circuit 120 and the main control circuit 130, and the water pressure and temperature detection circuit 140 is configured to detect water pressure and temperature information in the washing machine and transmit the detected water pressure and temperature information to the main control circuit 130, so that the main control circuit 130 transmits the water pressure and temperature information to the main control board 130 of the washing machine through the interface circuit 110.

In another embodiment of the present invention, as shown in fig. 14, the main control circuit 130 includes a main control chip U2, and the main control chip U2 is connected to the voltage conversion circuit 120, the interface circuit 110, and the water pressure and temperature detection circuit 140. Specifically, in this embodiment, the model of the main control chip U2 is preferably STM8S003 or a chip of the same type is selected by a person skilled in the art according to actual requirements.

In another embodiment of the present invention, as shown in fig. 14, the water pressure and temperature detection circuit 140 includes a water pressure and temperature detection chip U3, the water pressure and temperature detection chip U3 is connected to the voltage conversion circuit 120, a data transmission pin of the temperature detection chip U3 is connected to a data transmission pin of the main control chip U2, and a clock control pin of the temperature detection chip U3 is connected to a clock control pin of the main control chip U2. Specifically, the data transmission pin of the temperature detection chip U3 is an SDA pin, and the clock control pin of the temperature detection chip U3 is an SCL pin. In this embodiment, the third pin of the temperature detection chip U3 is connected to the eleventh pin of the main control chip U2, and the fourth pin of the temperature detection chip U3 is connected to the twelfth pin of the main control chip U2. The model of the water pressure and temperature detecting chip U3 is preferably DPS310.

The DPS310 digital pressure sensor is a miniature barometric pressure sensor with high accuracy and low current consumption. The sensor is based on the principle of capacitive sensing and is capable of measuring pressure and temperature. This ensures high accuracy in the temperature change process, and by adopting the sensor, the accuracy and precision of data measurement are greatly improved.

The internal signal processor of DPS310 converts the output of the pressure and temperature sensor elements into 24-bit results, each unit is calibrated individually, the calibration coefficients calculated in this process are stored in the calibration registers, and these coefficients are used to convert the measurement results into high-precision pressure and temperature values, so that the temperature and water pressure can be measured at one time by one of the temperature detection chips U3, which is efficient and convenient.

In another embodiment of the present invention, as shown in fig. 14, the voltage conversion circuit 120 includes a voltage stabilizing chip U1, an input pin of the voltage stabilizing chip U1 is connected to a power supply output end of the main control board 180 of the washing machine, and an output pin of the voltage stabilizing chip U1 is connected to a power supply pin of the main control chip U2 and a power supply pin of the water pressure and temperature detecting chip U3, respectively, and supplies power to the main control chip U2 and the water pressure and temperature detecting chip U3. In this embodiment, the reference number of the power supply output end of the main control board 180 of the washing machine is VIN. The input pin of the voltage stabilizing chip U1 is the second pin of the voltage stabilizing chip U1, the output pin of the voltage stabilizing chip U1 is the third pin of the voltage stabilizing chip U1, and the voltage output by the power supply output end of the main control board 180 of the washing machine is converted by the voltage stabilizing chip U1 and then is output to 3.3V from the third pin. The power supply pin of the main control chip U2 is a ninth pin, and the power supply pin of the water pressure and temperature detection chip U3 is an eighth pin. The model of the voltage stabilizing chip U1 is preferably TLV70433.

In another embodiment of the present invention, as shown in fig. 14 to 15, the voltage conversion circuit 120 further includes an input protection circuit 121, where the input protection circuit 121 is disposed between a power supply output end of the main control board 180 of the washing machine and an input pin of the voltage stabilizing chip U1.

In another embodiment of the present invention, as shown in fig. 14, the input protection circuit 121 includes a self-recovery fuse JZ1, and two ends of the self-recovery fuse JZ1 are respectively connected to a power supply output end of the main control board 180 of the washing machine and an input pin of the voltage stabilizing chip U1. When the current passing through the self-recovery fuse JZ1 is too large, the resistance value of the self-recovery fuse JZ1 becomes large, thereby functioning as a protection circuit.

In another embodiment of the present invention, as shown in fig. 14, the input protection circuit 121 further includes a protection diode D1, where a cathode of the protection diode D1 is connected to the input pin of the voltage stabilizing chip U1, and an anode of the protection diode D1 is grounded. The protection diode D1 is configured to prevent the subsequent circuit from being damaged by a surge or peak of the voltage output from the power supply output terminal of the main control board 180 of the washing machine.

In another embodiment of the present invention, as shown in fig. 14, the interface circuit 110 includes a connection port J4, a first pin of the connection port J4 is connected to a serial input pin of the main control chip U2, a third pin of the connection port J4 is connected to a serial output pin of the main control chip U2, a second pin of the connection port J4 is grounded, and a fourth pin of the connection port J4 is connected to a power supply output end of the main control board 180 of the washing machine.

Specifically, the serial port input pin of the main control chip U2 is an RX pin, the serial port output pin of the main control chip U2 is a TX pin, in this embodiment, the first pin of the connection port J4 is connected with the third pin of the main control chip U2, and the third pin of the connection port J4 is connected with the second pin of the main control chip U2. Thus, parameters of the water pressure and temperature detection chip U3 are configured in an I2C communication mode, the main control chip U2 also obtains the water pressure and temperature information detected by the water pressure and temperature detection chip U3 in an I2C communication mode, the main control chip U2 analyzes the water pressure information to obtain water level information in a water bucket of the washing machine through the received water pressure and temperature information, and the water temperature information is obtained through analysis of the temperature information. Then, the main control chip U2 sends the water level information and the water temperature information to the main control board 180 through the connection port J4, so that the main control board 180 controls the washing machine to work according to the water level information and the water temperature information.

In another embodiment of the present invention, as shown in fig. 14 to 15, the detecting circuit 100 further includes a vibration detecting circuit 150, the vibration detecting circuit 150 is connected to the main control circuit 130 and the voltage converting circuit 120, the vibration detecting circuit 150 is used for detecting vibration information of the washing machine and transmitting the vibration information to the main control circuit 130, and the main control circuit 130 transmits the vibration information to the main control board 180 of the washing machine through the interface circuit 110.

Specifically, the vibration detection circuit 150 includes a vibration detection chip U4, a first pin of the vibration detection chip U4 is connected to a third pin of the voltage stabilizing chip U1, a fourteenth pin of the vibration detection chip U4 is connected to a twelfth pin of the main control chip U2, and a thirteenth pin of the vibration detection chip U4 is connected to an eleventh pin of the main control chip U2. In this embodiment, the model of the vibration detecting chip U4 is preferably ADXL345 or a model of the same type.

In another embodiment of the present invention, as shown in fig. 16-17, the water pressure and temperature detecting circuit 140 includes an internal detecting circuit 141 and an external detecting circuit 142, and the internal detecting circuit 141 and the external detecting circuit 142 are connected to the main control circuit 130; the built-in detection circuit 141 is used for detecting the water pressure in the tub of the washing machine, and the external detection circuit 142 is used for detecting the atmospheric pressure outside the tub of the washing machine.

Specifically, the internal detection circuit 141 and the external detection circuit 142 respectively include a water pressure and temperature detection chip. In this embodiment, the water pressure and temperature detecting chip of the built-in detecting circuit 141 is denoted by reference numeral U3, that is, the built-in detecting circuit 141 includes a water pressure and temperature detecting chip U3. The water pressure and temperature detecting chip of the external detecting circuit is denoted by U5, that is, the external detecting circuit 142 includes a water pressure and temperature detecting chip U5.

The third pin and the fourth pin of the water pressure and temperature detection chip U3 and the water pressure and temperature detection chip U5 are respectively connected with the eleventh pin and the twelfth pin of the main control chip U2.

The fifth pin of the water pressure and temperature detection chip U3 is suspended, the highest position of the I2C slave address of the water pressure and temperature detection chip U3 is 1, the fifth pin of the water pressure and temperature detection chip U5 is grounded, and the lowest position of the I2C slave address of the water pressure and temperature detection chip U5 is 0, so that the main control chip U2 can distinguish the water pressure and temperature detection chip U3 and the water pressure and temperature detection chip U5 according to the slave address, and communication between the main control chip U2 and the water pressure and temperature detection chip U3 and communication between the water pressure and temperature detection chip U5 can be independently realized.

Further, in practical application, the detection end of the built-in detection circuit 141 and the detection end of the temperature detection chip U3 are located at the bottom of the water tub of the washing machine, that is, the detection end of the built-in detection circuit 141 and the detection end of the temperature detection chip U3 are opposite to each other and are the pressure of water in the water tub, the pressure is actually the pressure of water plus the pressure of atmospheric pressure, and the master control chip U2 converts the sum of the pressure of water and the atmospheric pressure into the information of the height of the water level in the water tub and sends the information to the master control board of the washing machine.

If the washing machine is located on a higher floor, such as twenty floors, the difference between the atmospheric pressure of twenty floors and the atmospheric pressure of one floor is too large, and if the sum of the pressure of water and the atmospheric pressure is directly converted into the water level height information in the water containing bucket in twenty floors, a large error can be generated, so that the water level detection in the washing machine is inaccurate, and the work of the washing machine is affected. Therefore, in the present application, the external detection circuit 142 is disposed, and the water pressure and temperature detection chip U5 of the external detection circuit 142 is located outside the area covered by the water level of the tub, so that the external detection circuit 142 detects the atmospheric pressure outside the tub of the washing machine, so that the main control chip U2 subtracts the pressure value detected by the water pressure and temperature detection chip U3 of the internal detection circuit 141 from the pressure value detected by the water pressure and temperature detection chip U5 of the external detection circuit 142, so as to obtain the pressure value of the actual water level, and then converts the pressure value of the actual water level to obtain the actual water level height information in the tub, so that by setting the internal detection circuit 141 and the external detection circuit 142, the influence of the change of the external atmospheric pressure on the water level detection in the tub of the washing machine is eliminated, so that the accurate water level measurement is realized, and the practicability is extremely high.

In another embodiment of the present invention, based on the washing machine tub water level control system, the step S210 specifically includes: and acquiring external atmospheric pressure information outside the washing machine through the detection sensor for the washing machine.

Specifically, the water pressure in the tub of the washing machine is detected by the built-in detection circuit 141, i.e., the actual tub pressure information in the tub of the washing machine is acquired by the built-in detection circuit 141.

The external detection circuit 142 is used for detecting the atmospheric pressure outside the water tub of the washing machine, namely, the external atmospheric pressure information outside the washing machine is acquired by the external detection circuit 142.

In another embodiment of the present invention, based on the washing machine tub water level control system, the step S200 specifically includes:

step S210: acquiring external atmospheric pressure information outside the washing machine through the water pressure and temperature detection circuit 140 in the washing machine detection sensor;

step S220: acquiring actual water tub pressure information in a water tub of the washing machine through the water pressure and temperature detection circuit 140 of the detection sensor for the washing machine, wherein the actual water tub pressure information comprises the external atmospheric pressure information and actual water tub water level pressure information;

Step S230: acquiring the actual tub water level pressure information according to a difference value between the actual tub pressure information and the external atmospheric pressure information through the main control circuit 130 in the detection sensor for the washing machine;

step S240: the absolute water level information in the water tub is obtained by the main control circuit 130 in the detection sensor for the washing machine through pressure water level conversion calculation according to the actual water level pressure information of the water tub.

step S211: acquiring washing machine drainage information after the washing machine is electrified through a main control circuit in the detection circuit, wherein the washing machine drainage information is used for controlling a drainage valve of the washing machine to be opened so as to drain water in a water bucket of the washing machine;

step S212: acquiring pressure information of a water holding barrel in water holding barrel of the washing machine in the water holding process in real time through a main control circuit 130 in a detection sensor for the washing machine, wherein each time point in the water holding process corresponds to one pressure information of the water holding barrel in water holding process;

step S213: judging whether the pressure information of each water-draining tub in the water draining process is changed in real time by the main control circuit 130 in the detection sensor for the washing machine, and if the pressure information of each water-draining tub is judged to be unchanged and continuously exceeds the preset water draining finishing time, setting the current pressure information of the water-draining tub as the external atmospheric pressure information.

In the step S213: the defining the current pressure information of the water containing barrel in the drainage as the external atmospheric pressure information further comprises the following steps:

step S214: acquiring empty bucket pressure information in the water bucket in real time through a detection sensor for the washing machine, wherein each time point in the acquisition process corresponds to one empty bucket pressure information respectively;

step S215: judging whether the change of the empty tub pressure information exceeds a preset pressure change value within a preset time period by the main control circuit 130 in the detection sensor for the washing machine; and if so, setting the changed empty barrel pressure information as the external atmospheric pressure information.

In another embodiment of the present invention, based on the washing machine tub water level control system, the step S210: the acquiring external atmospheric pressure information outside the washing machine specifically includes:

In this step, the external detection circuit is the external detection circuit 142 in the detection sensor for the washing machine.

In another embodiment of the present invention, the pressure-water level conversion calculation is performed by the main control circuit 130 in the detection sensor for the washing machine to obtain the actual tub water level pressure information.

In another embodiment of the present invention, based on the washing machine tub water level control system, the step S221 specifically includes: obtaining pressure variation speed information of the actual tub pressure information according to the actual tub pressure information through the main control circuit 130 in the detection sensor for the washing machine;

the step S222 specifically includes: and comparing the pressure change speed information with preset normal water supply and drainage speed information through the main control circuit 130 in the detection sensor for the washing machine, and if the pressure change speed information is not matched with the normal water supply and drainage change speed information, generating a water supply and drainage abnormal instruction through the main control circuit 130 in the detection sensor for the washing machine, and sending the water supply and drainage abnormal instruction to the main control board of the washing machine, wherein the water supply and drainage abnormal instruction is used for controlling the washing machine to send water supply and drainage abnormal warning.

In another embodiment of the present invention, based on the washing machine tub water level control system, step S410 specifically includes: acquiring a heating instruction and target heating temperature information of the washing machine through the main control circuit 130 in the detection sensor for the washing machine, wherein the heating instruction is used for controlling the washing machine to heat water in the water bucket;

The step S420 specifically includes: acquiring actual water temperature information in a water tub of the washing machine in real time through a water pressure and temperature detection circuit 140 in the detection sensor for the washing machine;

the step S430 specifically includes: and comparing the actual water temperature information with the target heating temperature information by the main control circuit 130 in the detection sensor for the washing machine, judging whether the actual water temperature information is matched with the target heating temperature information, and if so, generating a heating stop instruction by the main control circuit 130 in the detection sensor for the washing machine, wherein the heating stop instruction is used for controlling the washing machine to stop heating water of the water containing barrel.

Step S421 specifically includes: obtaining temperature change information of the actual water temperature information according to the actual water temperature information by the main control circuit 130 in the detection sensor for the washing machine;

the step S422 specifically includes: and comparing the temperature change information with preset normal heating temperature change information by the main control circuit 130 in the detection sensor for the washing machine, and if the temperature change information is not matched with the normal heating temperature change information, generating a temperature heating abnormality instruction, wherein the temperature heating abnormality instruction is used for controlling the washing machine to send out a temperature heating abnormality warning.

Of course, the design calculation method of the invention can also be transferred to the main control board of the washing machine, namely, the detection sensor for the washing machine only detects the temperature information of the pressure gauge and sends the temperature information to the main control board of the washing machine, and the main control board of the washing machine processes the data. In this regard, the present invention is not particularly limited, as will be set by those of ordinary skill in the art according to actual needs.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. The water level control method of the water tank of the washing machine is characterized by being carried out based on a water level control system of the water tank of the washing machine, wherein the water level control system of the water tank of the washing machine comprises a main board control device of the washing machine and a detection sensor for the washing machine which are connected in sequence; the water level control method of the water tub of the washing machine includes:

The acquiring absolute water level height information in a water bucket of the washing machine specifically comprises the following steps:

acquiring external atmospheric pressure information outside the washing machine;

acquiring actual water holding barrel pressure information in a water holding barrel of the washing machine, wherein the actual water holding barrel pressure information comprises the external atmospheric pressure information and actual water holding barrel water level pressure information;

acquiring the actual water bucket water level pressure information according to a difference value between the actual water bucket pressure information and the external atmospheric pressure information;

obtaining absolute water level height information in the water holding barrel through pressure water level conversion calculation according to the actual water holding barrel water level pressure information;

comparing the absolute water level information in the water containing barrel with the target water level information through the detection sensor for the washing machine, judging whether the absolute water level information in the water containing barrel is not smaller than the target water level information or not and sending the information to the main board control device of the washing machine, and if so, generating a water supply and drainage stop instruction through the detection sensor for the washing machine, wherein the water supply and drainage stop instruction comprises a water supply stop instruction and a drainage stop instruction, the water supply stop instruction is used for controlling the main board control device of the washing machine to stop water supply to the water containing barrel, and the drainage stop instruction is used for controlling the washing machine to stop water drainage to the outside of the washing machine;

The acquiring external atmospheric pressure information outside the washing machine specifically includes:

acquiring washing machine drainage information after the washing machine is electrified, wherein the washing machine drainage information is used for controlling a drainage valve of the washing machine to be opened so as to drain water in a water holding barrel by the washing machine;

acquiring pressure information of a water holding barrel in water draining in a water holding barrel of the washing machine in a water draining process in real time, wherein each time point in the water draining process corresponds to one pressure information of the water holding barrel in water draining;

judging whether the pressure information of the water holding bucket in each drainage in the drainage process changes in real time, and if the pressure information of the water holding bucket in each drainage is judged to be unchanged and continuously exceeds the preset drainage finishing time, setting the current pressure information of the water holding bucket in the drainage as the external atmospheric pressure information;

the detection sensor for the washing machine further comprises a shell, a pressure conductive elastic membrane, a pressure conductive medium and a pressure detection PCB; the detection circuit is arranged on the pressure detection PCB; the bottom of the shell is provided with a bottom opening, the pressure conducting elastic membrane is arranged in the shell and seals the bottom opening, the pressure conducting medium is accommodated in the shell and is arranged by pressing the pressure conducting elastic membrane, the pressure detecting PCB is arranged in the shell and is arranged by pressing the pressure conducting medium, and the detecting end of the pressure detecting PCB stretches into the pressure conducting medium, so that the external pressure is conducted to the detecting end of the pressure detecting PCB after sequentially passing through the pressure conducting elastic membrane and the pressure conducting medium, and the pressure detecting PCB detects the external pressure;

The periphery of the bottom of the shell extends towards the center direction of the bottom opening to form an elastic membrane mounting part, and the periphery of the pressure conductive elastic membrane is connected with the elastic membrane mounting part; the elastic membrane mounting part is used for conveniently mounting the pressure conductive elastic membrane;

the elastic membrane installation part comprises a bearing platform, the periphery of the bearing platform is curled inwards the shell to form a fixing convex rib, and the inner surface of the fixing convex rib is attached to the periphery of the pressure conducting elastic membrane.

2. The method of controlling a water level of a tub of a washing machine as claimed in claim 1, wherein the acquiring external atmospheric pressure information of the outside of the washing machine comprises:

3. The method of controlling a water level of a tub of a washing machine as claimed in claim 1, wherein the defining the current in-drain tub pressure information as the external atmospheric pressure information further includes:

acquiring empty bucket pressure information in the water bucket in real time, wherein each time point in the acquisition process corresponds to one empty bucket pressure information respectively;

Judging whether the change of the pressure information of each empty barrel exceeds a preset pressure change value within a preset time period; and if so, setting the changed empty barrel pressure information as the external atmospheric pressure information.

4. The method of controlling a water level of a tub of a washing machine as claimed in claim 1, wherein the pressure water level conversion calculation is performed based on the following formula:

；

wherein h is the absolute water level height information in the water containing barrel, P _Measuring For the actual water containing barrel pressure information, P _{Air flow} For the external barometric pressure information,

，/>

。

5. the method of controlling a water level of a tub of a washing machine as claimed in claim 1, wherein the acquiring actual tub pressure information in the tub of the washing machine further comprises:

obtaining pressure variation speed information of the actual water holding barrel pressure information according to the actual water holding barrel pressure information;

comparing and analyzing the pressure change speed information with preset normal water supply and drainage speed information, and if the pressure change speed information is not matched with the normal water supply and drainage speed information, generating a water supply and drainage abnormal instruction which is used for controlling the washing machine to send out water supply and drainage abnormal warning.

6. The method for controlling the water level of a tub of a washing machine as claimed in claim 1, wherein the acquiring of the absolute water level height information in the tub of the washing machine further comprises:

acquiring a heating instruction and target heating temperature information of the washing machine, wherein the heating instruction is used for controlling the washing machine to heat water in the water containing barrel;

acquiring actual water temperature information in a water bucket of the washing machine in real time;

comparing the actual water temperature information with the target heating temperature information, judging whether the actual water temperature information is matched with the target heating temperature information, and if so, generating a heating stop instruction which is used for controlling the washing machine to stop heating water in the water bucket.

7. The method of controlling a water level of a tub of a washing machine as claimed in claim 6, wherein the acquiring of the actual water temperature information in the tub of the washing machine in real time further comprises:

obtaining temperature change information of the actual water temperature information according to the actual water temperature information;

comparing and analyzing the temperature change information with preset normal heating temperature change information, and if the temperature change information is not matched with the normal heating temperature change information, generating a temperature heating abnormal instruction which is used for controlling the washing machine to send out a temperature heating abnormal warning.

8. The method for controlling the water level of a tub of a washing machine as claimed in claim 1, wherein the main board control unit of the washing machine comprises a main board of the washing machine, a water inlet valve, a water outlet valve, and a heating unit; the main control board of the washing machine is connected with the detection sensor for the washing machine, and the water inlet valve, the water outlet valve and the heating device are all connected with the main control board of the washing machine.

9. The method of controlling a water level of a tub of a washing machine as claimed in claim 8, wherein the detection sensor for the washing machine includes a detection circuit including:

the interface circuit is connected with the main control board of the washing machine;

the voltage conversion circuit is connected with the interface circuit;

the main control circuit is connected with the voltage conversion circuit and the interface circuit;

the pressure and temperature detection circuit is connected with the voltage conversion circuit and the main control circuit, and is used for detecting pressure and temperature information in the washing machine and transmitting the detected pressure and temperature information to the main control circuit so that the main control circuit transmits the pressure and temperature information to the main board of the washing machine through the interface circuit.

10. The method of controlling a water level of a tub of a washing machine as claimed in claim 9, wherein the pressure and temperature detecting circuit includes an internal detecting circuit and an external detecting circuit, both of which are connected with the main control circuit; the built-in detection circuit is used for detecting actual water holding barrel pressure information in the water holding barrel of the washing machine, and the external detection circuit is used for detecting external atmospheric pressure information outside the water holding barrel of the washing machine.

11. The method of controlling a water level of a tub of a washing machine as claimed in claim 1, wherein the detecting sensor for the washing machine further comprises an elastic membrane pressing member installed in the housing; the middle part of the elastic membrane pressing piece is provided with a clearance hole for clearance of the pressure intensity conductive elastic membrane, and the bottom surface of the periphery of the elastic membrane pressing piece is pressed on the top surface of the periphery of the pressure intensity conductive elastic membrane.