CN111593531A - Water level control method for washing machine - Google Patents

Water level control method for washing machine Download PDF

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Publication number
CN111593531A
CN111593531A CN202010480248.8A CN202010480248A CN111593531A CN 111593531 A CN111593531 A CN 111593531A CN 202010480248 A CN202010480248 A CN 202010480248A CN 111593531 A CN111593531 A CN 111593531A
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water
washing machine
pressure
information
drainage
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CN111593531B (en
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胡波清
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Guangdong Lanshuihua Intelligent Electronic Co ltd
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Guangdong Lanshuihua Intelligent Electronic Co ltd
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/34—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of water filling
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/42—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of draining
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/47—Responding to irregular working conditions, e.g. malfunctioning of pumps 
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/14—Supply, recirculation or draining of washing liquid
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/16—Washing liquid temperature
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/10—Temperature of washing liquids; Heating means therefor
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

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 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 containing barrel of the washing machine; and comparing the absolute water level height information in the water containing barrel with the target water level height information, judging whether the absolute water level height information in the water containing barrel is not less than the target water level height information, and if so, generating a water supply and drainage stopping 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 bucket 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 a water containing barrel of the washing machine, and then the pressure is converted into the water level height, so that the water level height in the washing machine is obtained, and the water supply and drainage of the washing machine is controlled according to the water level height.
However, the water level in the water tub of the washing machine which can be detected by the washing machine at present is affected by the atmospheric pressure, for example, when the washing machine is used in a thirty-storey floor, the atmospheric pressure of the thirty-storey floor is greatly different from the atmospheric pressure of a first storey floor, and the pressure in the water tub of the washing machine which is detected by the washing machine is not the pressure caused by the water level after the atmospheric pressure interference is eliminated, so that the washing machine has a great deviation from the actual water level after the detected pressure is converted into the water level height, and further the washing machine cannot accurately control the water level in the subsequent washing process. 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, and aims to solve the technical problem that the water level cannot be accurately controlled in the washing process because the obtained water level is easily influenced by atmospheric pressure when the washing machine works in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling a water level of a tub of a washing machine, the method including the steps of:
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 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 containing barrel of the washing machine;
and comparing the absolute water level height information in the water containing barrel with the target water level height information, judging whether the absolute water level height information in the water containing barrel is not less than the target water level height information, if so, generating a water supply and drainage stopping instruction, wherein the water supply and drainage stopping instruction comprises a water supply stopping instruction and a drainage stopping instruction, the water supply stopping instruction is used for controlling the washing machine to stop supplying water into the water containing barrel, and the drainage stopping 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, where the method for controlling the water level of the tub of the washing machine is performed based on a water level control system of the tub of the washing machine, and the water level control system of the tub of the washing machine includes a main board control device of the washing machine and a detection sensor for the washing machine, which are sequentially connected; the washing machine tub water level control method 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, 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 containing barrel of the washing machine through a detection sensor for the washing machine;
the washing machine is characterized in that the washing machine is provided with a detection sensor, the detection sensor is used for comparing absolute water level height information in the water containing barrel with target water level height information, whether the absolute water level height information in the water containing barrel is not smaller than the target water level height information is judged, the target water level height information is sent to the washing machine main board control device, if the absolute water level height information is judged to be larger than the target water level height information, a water supply and drainage stopping instruction is generated through the detection sensor for the washing machine, wherein the water supply and drainage stopping instruction comprises a water supply stopping instruction and a drainage stopping instruction, the water supply stopping instruction is used for controlling the washing machine to stop supplying water into the water containing barrel, and the drainage stopping.
One or more technical schemes in the water level control method of the washing machine provided by the embodiment of the invention at least have one of the following technical effects: according to the invention, water supply and drainage instruction information and target water level height information of the washing machine are obtained, so that the washing machine is controlled to supply water into a water containing barrel of the washing machine or the water containing barrel of the washing machine is controlled to drain water to the outside of the washing machine; then acquiring absolute water level height information in a water containing 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 the absolute water level height information in the water containing barrel is judged to be not less than the target water level height information, so that the washing machine is controlled to stop supplying water into the water containing barrel or stop draining water to the outside of the washing machine, and the water level in the washing process is accurately controlled 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 in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic overall structure diagram 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 detection sensor for a washing machine according to an embodiment of the present invention;
FIG. 4 is a schematic view of the structure of FIG. 3 from another perspective;
fig. 5 is a schematic cross-sectional view illustrating a casing of a detection sensor for a washing machine according to an embodiment of the present invention;
fig. 6 is a schematic view of an overall 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 illustrating another structure of a pressure conductive elastic membrane of the detecting sensor for washing machine of FIG. 6;
fig. 8 is a schematic view illustrating an 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 cross-sectional view of the pressure conductive elastic membrane of the detecting sensor for washing machine of FIG. 8;
fig. 10 is a sectional view of a pressure conductive elastic membrane of a detecting sensor for a washing machine according to another embodiment of the present invention;
fig. 11 is a sectional view of a pressure conductive elastic membrane of a detecting sensor for a washing machine according to another embodiment of the present invention;
fig. 12 is a schematic cross-sectional view illustrating a detecting sensor for a washing machine according to another embodiment of the present invention;
fig. 13 is a schematic cross-sectional view illustrating a casing of a detection 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 detection circuit of the detection 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 tub water level control method of a washing machine according to an embodiment of the present invention;
fig. 19 is a flowchart of a step S200 of a washing machine tub water level control method according to an embodiment of the present invention;
fig. 20 is a flowchart of step S210 of a washing machine tub water level control method according to an embodiment of the present invention;
fig. 21 is a flowchart after step S213 of a method for controlling a water level of a tub of a washing machine according to an embodiment of the present invention;
fig. 22 is a flowchart after step S220 of the washing machine tub water level control method according to the embodiment of the present invention;
fig. 23 is a flowchart after step S200 of a method for controlling a water level of a tub of a washing machine according to an embodiment of the present invention;
fig. 24 is a flowchart illustrating a step S420 of a washing machine tub water level control method according to an embodiment of the present invention;
fig. 25 is a block diagram illustrating a structure of a tub water level control system of a washing machine according to an embodiment of the present invention;
fig. 26 is an application scenario diagram of a washing machine tub water level control system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the embodiments of the present 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 washing machine tub water level control 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 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;
specifically, in this step, when the user uses the washing machine to wash clothes, the power supply of the washing machine is firstly turned on, and then the washing modes are set, wherein different washing modes have different water supply instructions and target water level heights, 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 drainage 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 also obtain a drainage instruction and target water level height information, and water in the washing machine water drum is drained according to the drainage instruction, and the water level height in the washing machine water drum is consistent with the target water level height information.
Step S200: acquiring absolute water level height information in a water containing barrel of the washing machine;
specifically, in this step, the absolute water level height information in the water tub is only water level height information obtained by converting the pressure of water in the water tub of the washing machine, and the influence of atmospheric pressure on the water level height is eliminated.
Step S300: and comparing the absolute water level height information in the water containing barrel with the target water level height information, judging whether the absolute water level height information in the water containing barrel is not less than the target water level height information, if so, generating a water supply and drainage stopping instruction, wherein the water supply and drainage stopping instruction comprises a water supply stopping instruction and a drainage stopping instruction, the water supply stopping instruction is used for controlling the washing machine to stop supplying water into the water containing barrel, and the drainage stopping 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 height value in the tub included in the absolute water level height information in the tub only reaches the target water level height value included in the target water level height information, which means that the water drainage or water supply has reached the target, the water supply stop command or the water drainage stop command is generated to stop the water supply to the tub or the water drainage to the outside of the washing machine.
Therefore, 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 bucket of the washing machine or controlling the water bucket of the washing machine to drain water to the outside of the washing machine; then acquiring absolute water level height information in a water containing 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 the absolute water level height information in the water containing barrel is judged to be not less than the target water level height information, so that the washing machine is controlled to stop supplying water into the water containing barrel or stop draining water to the outside of the washing machine, and the water level in the washing process is accurately controlled 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 containing barrel of the washing machine specifically comprises the following steps:
step S210: obtaining external atmospheric pressure information outside the washing machine;
in this step, the external atmospheric pressure information is an atmospheric pressure of a space outside an area where water in a tub of the washing machine covers the tub.
Step S220: acquiring actual water barrel pressure information in a water barrel of a washing machine, wherein the actual water barrel pressure information comprises the external atmospheric pressure information and actual water barrel water level pressure information;
specifically, in this step, the actual tub pressure information is a pressure brought by the atmospheric pressure outside an area occupied by water in the tub of the washing machine together with 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 tub water level pressure information is pressure brought by water in a water tub of the washing machine alone.
Step S230: acquiring actual water tub water level pressure information according to the difference between the actual water tub pressure information and the external atmospheric pressure information;
specifically, the actual tub water level pressure information is acquired by subtracting the external atmospheric pressure information from the actual tub pressure information, thereby eliminating the external atmospheric pressure information.
Step S240: and obtaining absolute water level height information in the water containing barrel through pressure and water level conversion calculation according to the actual water containing barrel water level pressure information.
Specifically, in this step, the absolute water level height information in the water containing barrel is a water level height value converted from pressure after interference caused by atmospheric pressure is eliminated, so that the absolute water level height information in the water containing barrel can more accurately reflect the height of water in the water containing barrel of the washing machine, a foundation is laid for accurate control of water level in the subsequent washing machine washing, and high efficiency and accuracy of water level control in the washing machine washing are ensured.
In another embodiment of the present invention, as shown in fig. 20, the step S210: the acquiring of the external atmospheric pressure information outside the washing machine specifically includes:
step S211: acquiring washing machine drainage information after the washing machine is powered on, wherein the washing machine drainage information is used for controlling a drainage valve of the washing machine to be opened so that the washing machine drains water in a water bucket;
in this embodiment, the method for obtaining the information of the external atmospheric pressure information is to drain water in a 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 brought by the atmospheric pressure. Specifically, in this step, a user turns on a power supply to supply power to the washing machine, the washing machine is powered on, the washing machine acquires the washing machine drainage information, and according to the washing machine drainage information, 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 water barrel pressure information in drainage in a water barrel of the washing machine in real time in a drainage process, wherein each time point in the drainage process corresponds to one water barrel pressure information in drainage respectively;
in the step, the water containing barrel pressure information in the drainage of the water containing barrel of the washing machine in the drainage process is detected, so that whether the water in the water containing barrel of the washing machine is drained or not is judged conveniently in the following step.
Step S213: and judging whether the pressure information of the water containing barrel in each drainage water in the drainage process changes in real time, and if the pressure information of the water containing barrel in each drainage water is judged to be kept unchanged and continuously exceeds the preset drainage finishing time, setting the current pressure information of the water containing barrel in the drainage water as the external atmospheric pressure information.
After normal drainage is completed, only the atmospheric pressure in the water containing barrel of the washing machine is left, so the atmospheric pressure in the water containing barrel of the washing machine is kept unchanged continuously. Therefore, when the drain tub pressure information remains unchanged and continues to exceed the preset drain completion time, which means that the water in the tub of the washing machine has been drained, the drain tub pressure information acquired at this time is the external atmospheric pressure information, i.e., the current drain tub pressure information is set as the external atmospheric pressure information.
Further, the drainage completion time is set by a person of ordinary skill in the art according to actual needs. If the draining completion time is set to 1 minute, after the draining in-water tub pressure information is maintained for 1 minute during the draining, it is determined that the draining is completed, and the draining in-water tub pressure information at this time is set as the external atmospheric pressure information.
In another embodiment of the present invention, as shown in fig. 21, in the step S213: after the defining the current draining water bucket pressure information as the external atmospheric pressure information, the method further comprises:
step S214: acquiring empty barrel pressure information in a water containing barrel in real time, wherein each time point in the acquisition process corresponds to one empty barrel pressure information;
specifically, when the washing machine is not in use, i.e., the washing machine empties water in the tub, it is not in use, the external atmospheric pressure is varied in real time. Therefore, at this time, it is necessary to learn and update the current atmospheric pressure value in real time. Specifically, empty barrel pressure information in the water barrel is acquired in real time through detection, so that atmospheric pressure information can be updated subsequently in 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 the pressure information is judged to be the external atmospheric pressure information, the changed pressure information of the empty barrel is set as the external atmospheric pressure information;
in this step, the preset pressure variation value is set to 80pa, and the preset time period is set to 30 seconds. When the pressure change of the empty barrel pressure information exceeds 80pa in the process of continuously acquiring the empty barrel pressure information in the water barrel within 30 seconds, the change can be judged as air pressure fluctuation, the empty barrel pressure information detected at the latest moment in the preset time period is updated to be the latest external atmospheric pressure information, and the changed empty barrel pressure information is set as the external atmospheric pressure information.
Therefore, real-time learning and updating of atmospheric pressure information are achieved. In the process of eliminating the influence of the atmospheric pressure information on the water level control of the washing machine, the accuracy of obtaining the atmospheric pressure information is further improved, so that the pressure value caused by the atmospheric pressure is accurately eliminated, the accuracy and the precision of obtaining the absolute water level height information in the water containing barrel are further improved, and 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 of the 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 a detection end of the external detection circuit is located outside the washing machine water bucket, so that another method is provided for acquiring the external atmospheric pressure information in real time without draining water in the washing machine water bucket.
In another embodiment of the present invention, the pressure-water level conversion calculation is performed based on the following formula:
Figure BDA0002517072720000091
wherein h is the contentAbsolute water level height information in water tub, PMeasuringFor the actual tub pressure information, PQi (Qi)For the external atmospheric pressure information, ρ 1000kg/m3，g＝9.8m/s2。
Specifically, the pressure of water is related to the water's height density, gravitational acceleration. Setting h to represent the height of water in the tub of the washing machine, ρ to represent the density of water, g to represent the acceleration of gravity, and PWater (W)The pressure brought by the water in the tub of the washing machine, i.e. the PWater (W)And the actual water bucket water level pressure information is obtained.
Further, from the actual tub pressure information including the external atmospheric pressure information and the actual tub water level pressure information, it may be known that: pMeasuring＝PQi (Qi)+PWater (W)；
And P isWater (W)＝ρhg；
Namely: pMeasuring＝PQi (Qi)+ρhg；
When the actual tub pressure information is calculated as a difference from the external atmospheric pressure information, it may be:
Figure BDA0002517072720000101
therefore, h can be calculated, and the absolute water level height information in the water containing barrel can be obtained.
In another embodiment of the present invention, as shown in fig. 22, after the step S220, and after the acquiring the actual tub pressure information inside the tub of the washing machine, the method further includes:
step S221: obtaining pressure change speed information of the actual water containing barrel pressure information according to the actual water containing barrel pressure information;
in particular, when the washing machine starts draining, a drainage failure may be caused by an external factor, such as a water tap connected to a drain valve of the washing machine to supply water to the washing machine not being opened, thereby causing a drainage failure. Therefore, it is necessary to calculate the rate of change of the actual tub pressure information according to the actual tub pressure information within the time occupied by the draining process to obtain the pressure change speed information of the actual tub pressure information, so as to determine whether water is normally supplied or not in the following process.
Step S222: and comparing and analyzing the pressure variation speed information with preset normal water supply and drainage speed information, and if the pressure variation speed information is not matched with the normal water supply and drainage variation speed information, generating a water supply and drainage abnormal instruction, wherein the water supply and drainage abnormal instruction is used for controlling the washing machine to send out a water supply and drainage abnormal warning.
Specifically, taking the case of normally supplying water into the tub of the washing machine as an example, the pressure inside the tub of the washing machine should be gradually increased as the water inside the tub is gradually increased, and the detected rate of change of the actual tub pressure information should be gradually increased as the water supply is increased, i.e., the actual tub pressure information should be increased at a fast increasing rate. If not, the problem of water supply is shown. The same applies to drainage.
Therefore, when the pressure intensity change speed information is not matched with the normal water supply and drainage change speed information, the water supply or drainage is abnormal, the water supply and drainage abnormal instruction is generated, and the washing machine is controlled to send out the water supply and drainage abnormal warning through the water supply and drainage abnormal instruction.
Further, the water supply and drainage abnormity warning includes, but is not limited to, reminding a user to treat the water supply and drainage abnormity by making a buzzer arranged on the washing machine sound normally.
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 containing barrel 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 a water drum;
in cold weather, when the user uses the washing machine, the user has the requirement of washing clothes with warm water at normal temperature. Therefore, when the heating instruction of the washing machine is received and the target heating temperature information is acquired, the washing machine starts to control the washing machine to heat.
Wherein the target heating information is the temperature set by the user and required to be reached after the 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 containing barrel of the washing machine in real time;
step S430: and 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, if so, generating a heating stop instruction, wherein the heating stop instruction is used for controlling the washing machine to stop heating the water in the water containing barrel.
Specifically, by acquiring actual water temperature information in a water tub of the washing machine in real time, the actual temperature information may be compared with the target heating temperature information in real time. And when the actual water temperature information reaches the target heating temperature information, judging whether the actual water temperature information is matched with the target heating temperature information. At this time, it is explained that the water has been heated to a desired temperature, and therefore, the washing machine is controlled to stop heating the water in the tub by generating the heating stop instruction at this time.
In another embodiment of the present invention, as shown in fig. 24, the step S420: the method also comprises the following steps of obtaining the actual water temperature information in the water containing barrel of the washing machine in real time:
step S421: obtaining temperature change information of the actual water temperature information according to the actual water temperature information;
step S422: and comparing and analyzing the temperature change information with preset normal heating temperature change information, if the temperature change information is not matched with the normal heating temperature change information, generating a temperature heating abnormal instruction, wherein the temperature heating abnormal instruction is used for controlling the washing machine to send out a temperature heating abnormal warning.
When water is heated normally, the water temperature is inevitably increased continuously and the temperature change information is inevitably increased at a higher speed along with the heating. If not, the heating abnormality is described.
Therefore, in this step, the temperature change information of the actual water temperature information is obtained by calculating each of the actual water temperature information when the actual water temperature information is acquired. And when the temperature change information is matched with the normal heating temperature change information, the temperature change information is in the normal heating process. And when the temperature change information is not matched with the normal heating temperature change information, indicating that the heating is abnormal, generating the temperature heating abnormal instruction and controlling the washing machine to send out a temperature heating abnormal warning.
Further, the temperature heating abnormity warning can be constantly sounded through a buzzer arranged on the washing machine so as to remind a user of treating the water supply and drainage abnormity.
In another embodiment of the present invention, as shown in fig. 1 to 25, there is also provided a washing machine tub water level control method, which is performed based on a washing machine tub water level control system in this embodiment.
Specifically, the washing machine tub water level control system includes a washing machine main board control device 800 and a detection sensor for the washing machine, which are connected in sequence.
Based on the washing machine water bucket water level control system, the washing machine water bucket water level control method comprises the following steps:
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 containing barrel of the washing machine through a detection sensor for the washing machine;
the step S400 specifically includes: the washing machine is characterized in that the washing machine is provided with a detection sensor, the detection sensor is used for comparing absolute water level height information in the water containing barrel with target water level height information, whether the absolute water level height information in the water containing barrel is not smaller than the target water level height information is judged, the target water level height information is sent to the washing machine main board control device, if the absolute water level height information is judged to be larger than the target water level height information, a water supply and drainage stopping instruction is generated through the detection sensor for the washing machine, wherein the water supply and drainage stopping instruction comprises a water supply stopping instruction and a drainage stopping instruction, the water supply stopping instruction is used for controlling the washing machine to stop supplying water into the water containing barrel, and the drainage stopping.
In another embodiment of the present invention, as shown in fig. 25 to 26, the washing machine main board control device 800 includes a washing machine main control board 180, a water inlet valve 820, a water discharge valve 830 and a heating device 840; the washing machine main control board 180 is connected with the detection sensor for the washing machine, and the water inlet valve 820, the water discharge valve 830 and the heating device 840 are all connected with the washing machine main control board.
Further, referring to fig. 26, when the washing machine tub water level control system is applied, in the present embodiment, a detection sensor for a washing machine is denoted by 880, a washing tub of the washing machine is denoted by 870, and a tub of the washing machine is denoted by 860. The detection end of the washing machine detection sensor 880 is in contact with the tub 860, and when water is present in the tub 860, the detection end is detected by the washing machine detection sensor 880.
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 sensing sensor for a washing machine, including a housing 300, a pressure conductive elastic membrane 200, a pressure conductive medium 400, and a pressure sensing 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 conducting elastic membrane 200, the pressure conducting medium 400 and the pressure detection PCB 500 are sequentially installed in the housing 300 from the upper opening 320. The pressure conducting elastic membrane 200 is installed in the housing 300 and then seals the bottom opening 310, the pressure conducting medium 400 is accommodated in the housing 300 and is arranged to press the pressure conducting elastic membrane 200, the pressure detecting PCB 500 is installed in the housing 300 and is arranged to press the pressure conducting medium 400, and the detecting end of the pressure detecting PCB 500 extends into the pressure conducting medium 400, so that external pressure is conducted to the detecting end of the pressure detecting PCB 500 after sequentially passing through the pressure conducting elastic membrane 200 and the pressure conducting medium 400, and then the pressure detecting PCB 500 detects the external pressure.
In the invention, by arranging the housing 300, the pressure conducting elastic membrane 200, the pressure conducting medium 400 and the pressure detecting PCB 500, accommodating the pressure conducting medium 400 in the housing, installing the pressure detecting PCB 500 in the housing 300 and pressing the pressure conducting medium 400, and arranging the detecting end of the pressure detecting PCB 500 to extend into the pressure conducting medium 400, when detecting external pressure, the external pressure can sequentially pass through the pressure conducting elastic membrane 200 and the pressure conducting medium 400 and then be conducted to the detecting end of the pressure detecting PCB 500, so that the pressure detecting PCB 500 detects the external pressure, compared with the prior art, the present application arranges the pressure conducting medium 400 between the pressure conducting elastic membrane 200 and the pressure detecting PCB 500, the external pressure is conducted to the pressure detection PCB board 500 through the pressure conduction elastic membrane 200 and the pressure conduction medium 400, so that the high-efficiency, fast and low-loss conduction of the pressure can be realized due to the elasticity of the pressure conduction elastic membrane 200 and the fluidity of the pressure conduction medium 400, the pressure detection precision is improved, the subsequent accurate control of the washing machine according to the pressure detection is realized, and the user experience is improved.
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 part 330, and the periphery of the pressure conductive elastic membrane 200 is connected to the elastic membrane mounting part 330. The elastic membrane mounting part 330 is used to conveniently mount the pressure conductive elastic membrane 200. After the installation, the bottom surface of the periphery of the pressure conducting elastic membrane 200 contacts the top surface of the elastic membrane installation part 330 and is tightly connected with the elastic membrane installation part through an external force, so that the pressure conducting elastic membrane 200 seals the bottom opening 310. Meanwhile, due to the elastic arrangement of the pressure conduction elastic membrane 200, when the pressure conduction elastic membrane 200 is tightly connected with the elastic membrane mounting part 330 by an external force, the periphery of the pressure conduction elastic membrane 200 is elastically deformed, so that under the action of the external force, on one hand, the tight connection between the pressure conduction elastic membrane 200 and the elastic membrane mounting part is realized, on the other hand, the sealing performance of the pressure conduction elastic membrane 200 after being sealed with the bottom opening is ensured, and the dual effects of connection and sealing are realized. Specifically, in the present embodiment, an ordinary person skilled in the art may select an adhesive or a pressing member such as glue to press the pressure-conducting elastic membrane 200 onto the elastic membrane mounting portion 330 according to actual requirements, so as to connect the periphery of the pressure-conducting elastic membrane 200 with the elastic membrane mounting portion 330 by using the adhesive or pressing force of the glue.
In another embodiment of the present invention, as shown in fig. 5, the elastic membrane mounting portion 330 includes a receiving platform 331, a periphery of the receiving platform 331 is curled toward the inside of the housing 300 to form a fixing rib 332, and an inner surface of the fixing rib 332 is abutted against a periphery of the pressure conductive elastic membrane 200. The upper surface of the receiving platform 331 is disposed in a plane, and when the pressure conducting elastic membrane 200 is mounted, the pressure conducting elastic membrane 200 is directly disposed on the receiving platform 331, so that the bottom surface of the periphery of the pressure conducting elastic membrane 200 is attached to the upper end surface of the receiving platform 331, and then the two are pressed together by using an external force. After the press-fitting, 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 is in contact with the elastically deformed portion of the pressure-conducting elastic membrane 200, but also the inner surface of the fixing rib of the pressure-conducting elastic membrane 200 is in contact, 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 simultaneous close contact of two portions.
In another embodiment of the present invention, as shown in fig. 2 to 4, the detection sensor for a washing machine further includes an elastic film pressing member 600, the elastic film pressing member 600 being installed in the housing 300; the middle of the elastic membrane pressing piece 600 is provided with a clearance hole 610 for avoiding the pressure conduction elastic membrane 200, and the bottom surface of the periphery of the elastic membrane pressing piece 600 is pressed on the top surface of the periphery of the pressure conduction elastic membrane 200, so that the bottom surface of the periphery of the pressure conduction elastic membrane 200 is attached to the bearing platform 331 and the fixing rib 332. The clearance hole 610 is used for not influencing the conduction of the pressure from the outside to the inside of the housing 300 along the pressure conduction elastic membrane 200. The periphery of the elastic membrane pressing piece 600 is pressed on the top surface of the periphery of the pressure conduction elastic membrane 200, so that the pressure conduction elastic membrane 200 is only in peripheral contact with the elastic membrane pressing piece 600, the pressure conduction elastic membrane 200 is guaranteed to be fixed on the premise that the function of pressure conduction of the pressure conduction elastic membrane 200 is not affected, the structural design is ingenious, the bottom surface of the periphery of the pressure conduction elastic membrane 200 is attached to the bearing platform 331 and the fixing protruding edge 332 after pressing, and the sealing performance is guaranteed.
In another embodiment of the present invention, as shown in fig. 2 and 4, the bottom of the housing 300 is provided with a pressing member mounting part 340 matched with the elastic film pressing member 600, so that the elastic film pressing member 600 is engaged in the pressing member mounting part 340. In this embodiment, the lateral wall of casing 300 bottom to inwards concave formation in the casing 300 compress tightly an installation department 340, compress tightly an installation department 340 with elasticity membrane pressure piece 600 phase-match sets up, so that external force will elasticity membrane pressure piece 600 install in when compressing tightly an installation department 340, elasticity membrane pressure piece 600 just block in the casing 300 and fixed pressure conduction elastic membrane 200 makes pressure conduction elastic membrane 200 take place elastic deformation and make its peripheral bottom surface and side respectively with accept platform 331 with fixed bead 332 laminates.
In another embodiment of the present invention, the elastic film pressing member 600 includes an annular pressing plate 620, a peripheral edge of the annular pressing plate 620 extends in a direction perpendicular to the annular pressing plate 620 to form a close-fitting column 630, a bottom surface of the close-fitting column 630 abuts against the receiving platform 331, and an outer side of the close-fitting column 630 is in close-fitting connection with an inner surface of the pressing member mounting portion 340. In this embodiment, the area and the shape of the annular pressing plate 620 are both matched with the area and the shape of the periphery of the pressure conducting elastic membrane 200, so that the annular pressing plate 620 is exactly pressed on the periphery of the pressure conducting elastic membrane 200, and 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 tight fitting column 630 is abutted to the bearing platform 331, and the outer side of the tight fitting column 630 is tightly connected with the inner surface of the pressing part mounting part 340 in a tight fit manner, so that the elastic film pressing part 600 can be mounted, and meanwhile, the possibility that other outside or liquid permeates into the shell can be sealed, 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 in a direction facing the pressure conducting medium 400 and extended to form a plurality of pressure conducting concave parts 210.
In another embodiment of the present invention, as shown in FIG. 8, each of the pressure conducting inner recesses 210 is disposed in a ring shape. When the detection sensor for the washing machine is used, one side surface of the pressure conduction elastic membrane 200 bears the pressure of water in a washing tub of the washing machine, and the pressure is conducted to the inside of the shell 300 through the pressure conduction elastic membrane 200 after being conducted to the other side surface of the pressure conduction elastic membrane 200. That is, when water is present in the water tub of the washing machine, the pressure of the water acts on each of the pressure conduction concave parts 210, and the pressure conduction concave parts 210 are set to have a ring shape, so that the water is conducted to the other side surface of the pressure conduction elastic membrane 200 along the ring shape of the pressure conduction concave parts 210 during pressure conduction, thereby better conducting the pressure caused by the water, and further ensuring the accuracy of subsequent pressure measurement. In this embodiment, each of the pressure conducting inner concave portions 210 is disposed in a circular ring shape. In this embodiment, the number of the pressure conducting inner recesses 210 is one.
In another embodiment of the present invention, as shown in fig. 6-7, the pressure conducting inner recesses 210 in the shape of a ring are equally spaced. Therefore, when the pressure of 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 that a high pressure conduction effect is ensured. In this embodiment, the number of the pressure conducting inner recesses 210 is two.
In another embodiment of the present invention, the center of each of the pressure conducting inner recesses 210 having a ring shape is the same as the center of the pressure conducting elastic membrane 200. That is, the center of each of the annular pressure conduction inner recesses 210 is the center of the pressure conduction elastic membrane 200, so that the stability of the overall structure of the pressure conduction elastic membrane 200 is ensured, the pressure of water is better supported, and the service life is prolonged.
In another embodiment of the present invention, as shown in fig. 6 to 9, each of the pressure conduction inner concave portions 210 is arranged in a stepped-down manner from the outer edge of the pressure conduction elastic membrane 200 toward the center of the pressure conduction elastic membrane 200. That is, the inward concave degree of each of the pressure conduction inner concave portions 210 decreases in sequence from the outer edge of the pressure conduction elastic film 200 to the center direction of the pressure conduction elastic film, and it can be understood that the inward concave surface of the pressure conduction inner concave portion 210 beside the center of the pressure conduction elastic film 200 is the lowest surface of the inward concave surface of each of the pressure conduction inner concave portions 210. Compared with the prior art, the planar structure has the advantages that the pressure conducting concave parts 210 are arranged in a step-down mode, so that the pressure can be transferred step by step along the pressure conducting concave parts 210 during pressure conduction, and the pressure conducting efficiency is improved. On the other hand, the pressure conducting elastic membrane 200 is integrally in a shape that one surface is recessed towards the other surface, when the pressure conducting elastic membrane 200 contacts water, each pressure conducting concave portion 210 has a flow guiding function, and in the flow guiding process, the pressure of the water also acts on each pressure conducting concave portion 210 along with the flow guiding function, and then is conducted to the other side surface of the pressure conducting elastic membrane 200, so that the pressure conduction is realized.
In another embodiment of the present invention, as shown in fig. 8, the middle portion of the pressure conductive elastic membrane 200 extends toward the opposite direction of the concavity of the pressure conductive inner concave portion 210 and forms a middle convex portion 220. That is, the whole structure of the pressure conducting elastic membrane 200 is not arranged with one side inclined to the other side, but the middle convex part 220 opposite to the concave direction of each pressure conducting concave part 210 is convexly arranged in the middle, so that when water pressure acts on each pressure conducting concave part 210, the middle convex part 220 provides an elastic force, thereby ensuring the stability of the pressure conducting elastic membrane 200 when 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 the stability of the whole structure of the elastic membrane. Specifically, the elastic force provided by the middle protruding portion 220 is a force that is diffused in the direction of the circumference of the pressure conductive elastic membrane 200 toward each of the pressure conductive inner concave portions 210 with the middle protruding portion 220 as the center.
In another embodiment of the present invention, as shown in fig. 6 to 7, the peripheral ring of the pressure-conducting elastic membrane 200 is provided with a first convex fitting part 230. In this embodiment, the first protruding close-fitting portion 230 is disposed in a circular 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 the two side surfaces of the pressure conducting elastic membrane 200 extend in the 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 protrusion close-fitting portion 241 and the back protrusion close-fitting portion 242 are symmetrically arranged. In this embodiment, protruding tight-fitting portion 241 of front with protruding tight-fitting portion 242 of reverse side is the setting of protruding form, just protruding tight-fitting portion 241 of front with protruding tight-fitting portion 242 of reverse side all is the elasticity setting, so, through protruding form protruding tight-fitting portion 241 of front with protruding tight-fitting portion 242 of reverse side makes fixedly during pressure conduction elastic membrane 200, compress tightly protruding tight-fitting portion 241 of front with protruding tight-fitting portion 242 of reverse side makes protruding tight-fitting portion 241 of front with the bellying of protruding tight-fitting portion 242 of reverse side takes place elastic deformation to guarantee the leakproofness.
In another embodiment of the present invention, as shown in fig. 11, a peripheral edge of one side surface 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 fitting portion 250, and the other side surface of the pressure conducting elastic membrane 200 is arranged in a planar manner. Specifically, a side is planar pressure conduction elastic membrane 200 be convenient for with accept platform 331 and closely laminate, another side sets up protruding tight fitting portion 250 of unilateral is so that elastic membrane pressure spare 600 is pressed and is located make it take place elastic deformation on the protruding tight fitting portion 250 of unilateral to leakproofness when keeping the installation, so, the facility and the sealing of installation are realized to the difference through two-sided setting, and is high-efficient swift.
In another embodiment of the present invention, the pressure conducting elastic membrane 200 is made of silica gel, that is, the pressure conducting elastic membrane 200 is made of elastic silica gel, and the silica gel material is adopted, so that the pressure conducting elastic membrane 200 has excellent elasticity, and when the pressure conducting elastic membrane 200 bears pressure, elastic deformation occurs rapidly, which greatly alleviates the obstruction of the hard structure of the detection material to the pressure conducting process, thereby ensuring a high-efficiency pressure conducting effect, and thus realizing accurate measurement of the pressure. Of course, the material of the pressure conducting elastic membrane 200 may also be selected from other materials as long as the requirement for conducting the pressure of the pressure conducting elastic membrane 200 can be met, and the application is not limited specifically.
In addition, this application pressure conduction 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 and makes pressure conduction elastic membrane 200 keeps as a whole, and the structure is more stable, improves indirectly the life of pressure conduction elastic membrane 200 to provide higher user experience for the user.
In another embodiment of the present invention, the pressure conducting medium 400 is made of silicone oil. The silicone oil has heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and smaller surface tension, and also has low viscosity-temperature coefficient and higher compression resistance. On one hand, since the silicone oil has compression resistance, it can efficiently conduct the pressure conducted through the pressure conducting elastic membrane 200, and further conducted to the pressure detecting PCB 500, so as to improve the pressure conducting efficiency. On the other hand, silicone oil is also an excellent heat transfer oil, so that it can efficiently transfer water temperature by providing the silicone oil as the pressure conducting medium 400, thereby enabling the pressure detecting PCB 500 to detect the temperature of water in the tub within the washing machine. In addition, the electrical insulation of the silicone oil enables the detection end of the pressure detection PCB 500 to be soaked in the silicone oil for a long time without damaging the circuit structure on the pressure detection PCB 500, thereby ensuring that the service time and the service life of the pressure detection PCB 500 are not influenced.
In another embodiment of the present invention, the housing 300 is made of stainless steel. In production, the housing 300 is made of stainless steel by drawing. Since the stainless steel treatment process in the prior art is becoming mature, the mature process on the market can be utilized to reduce the research and development cost when manufacturing the housing 300. The case 300 made of stainless steel has a certain strength, so that the stability of the overall structure of the detection sensor for the washing machine can be ensured. In addition, the housing 300 made of stainless steel has extremely strong thermal conductivity, and thus high-efficiency heat conduction when detecting water temperature is ensured.
In another embodiment of the present invention, as shown in fig. 1-4, the pressure detection PCB 500 includes a PCB holder 510 and a detection PCB 520, the detection PCB is partially clamped on the PCB holder 510, and a part of the detection PCB 520 is immersed in the pressure conductive 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 conducting medium 400. In this embodiment, the PCB fixing member 510 is made of rubber, and the PCB fixing member 510 and the detection PCB 520 are connected by low-temperature injection molding. After the bottom of the PCB fixing member 510 is attached to the upper end surface of the pressure conducting medium 400, the pressure conducting medium 400 is filled in the cavity between the PCB fixing member 510 and the pressure conducting elastic membrane 200 without any excess liquid or gas, so that the external pressure is completely conducted to the detection PCB 520 after passing through the pressure conducting elastic membrane 200 and then the pressure conducting medium 400, and the influence of excess substances in the pressure conducting medium 400 on the conduction of the pressure is avoided, thereby ensuring the high efficiency and accuracy of the conduction of the pressure 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 detection sensor for a washing machine further includes a fixing member supporter 530, the fixing member supporter 530 is mounted on the elastic film pressing member 600, and the PCB board fixing member 510 is mounted on the fixing member supporter 530. The fixing bracket 530 is used for fixing the PCB fixing member 510, and simultaneously, the PCB fixing member 510 is installed behind the fixing bracket 530, the PCB fixing member 510 gives the pressure on the fixing bracket 530 and the gravity of the fixing bracket 530 all fall on the elastic film pressing member 200, thereby fixing the PCB fixing member 510 and simultaneously having the pressing effect on the elastic film pressing member 600, which has extremely high practicability.
In another embodiment of the present invention, as shown in fig. 2 to 5, the fixing member bracket 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 support frame 531 contacts the PCB fixing member 510, and the bottom of the support column 532 is pressed against the elastic film pressing member 600. In this embodiment, the support frame 531 is disposed in a flat plate shape, and an upper surface of the flat plate-shaped support frame 531 contacts and adheres to the PCB fixing member 510, so as to improve the relative stability of the two. The supporting columns 531 are arranged at equal intervals to ensure the balance of the overall stress of the fixing piece bracket 530. In addition, each of the supporting columns 532 is disposed in a cylindrical shape, and is matched with the flat-plate-shaped supporting frame 531, so that while the supporting function is ensured, the volume occupied by the fixing member bracket 530 in the cavity between the PCB fixing member 510 and the pressure conduction elastic membrane 200 is reduced, so as to ensure that the cavity occupied by the pressure conduction medium 400 between the PCB fixing member 510 and the pressure conduction elastic membrane 200 occupies a larger volume, thereby ensuring the high efficiency and stability of the internal and external pressure conduction.
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 configured to match 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 installed on the fixing member installation platform 350, the sidewall of the PCB fixing member 510 is clamped on the fixing member installation platform 350, so that other fixing structures are not needed, the PCB fixing member 510 can be fixed by processing the casing 300 itself, and the production cost for producing other fixing components is saved while the fixing member is convenient and fast.
In another embodiment of the present invention, as shown in fig. 2-5 and 12-13, the PCB board fixing member 510 is provided with a plurality of medium guiding holes 511, and the bottom of each medium guiding hole 511 is outwardly expanded to form a medium outwardly expanded groove 512. Each of the medium guide holes 511 is used to inject the pressure conductive medium 400 into a cavity between the PCB board fixture 510 and the pressure conductive elastic membrane 200. During actual assembly, the PCB board fixing member 510 is installed in the housing 300, the pressure conducting medium 400 is injected through the medium guide holes 511, and after the pressure conducting medium 400 is filled, a vacuum pumping process is performed on a cavity between the PCB board fixing member 510 and the pressure conducting elastic membrane 200, so as to extract excessive gas. In the process of injecting the pressure conducting medium 400, the medium outward-expanding groove is used for accelerating the outflow of the pressure conducting medium 400, so that the liquid injection efficiency is improved, and the problem of blockage during liquid injection is prevented.
In another embodiment of the present invention, as shown in fig. 2 to 4, the detection sensor for a washing machine further includes a silicone fixing member 700, the silicone fixing member 700 is disposed in the housing 300 and above the detection PCB fixing member 510, and the silicone fixing member 700 is further connected to the detection PCB 520 and covers a part of the detection 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 housing 300, and the housing is kept still for a preset time until the silica gel is solidified, so that the silica gel fixing member 400 is formed, the medium guide hole 512 is blocked after the silica gel fixing member 400 is solidified, so that the pressure conducting medium 400 is ensured to be located in a sealed cavity, and in addition, the silica gel fixing member 700 is adhered to the inner side wall of the PCB fixing member 510 and the inner side wall of the housing 300 in the solidification process, so that the pressure conducting medium 400 is fixed in the housing 300 and the PCB fixing member 510 is fixed at the same time.
In another embodiment of the present invention, as shown in fig. 14-17, a detection circuit is disposed on the detection PCB, 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 washing machine main control panel 180 of the washing machine;
the voltage conversion circuit 120 is connected to the interface circuit 110;
the master control circuit 130 is connected to 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 washing machine main control board 130 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, the model of the main control chip U2 in this embodiment is preferably STM8S003 or the same type of chip is selected by a person skilled in the art according to actual needs.
In another embodiment of the present invention, as shown in fig. 14, the water pressure and temperature detecting circuit 140 includes a water pressure and temperature detecting chip U3, the water pressure and temperature detecting chip U3 is connected to the voltage converting circuit 120, a data transmission pin of the temperature detecting chip U3 is connected to a data transmission pin of the main control chip U2, and a clock control pin of the temperature detecting 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 detecting chip U3 is connected to the eleventh pin of the main control chip U2, and the fourth pin of the temperature detecting chip U3 is connected to the twelfth pin of the main control chip U2. The model of the water pressure and temperature detection chip U3 is preferably DPS 310.
The DPS310 digital pressure sensor is a miniature atmospheric 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 guarantees to have high accuracy in the temperature variation process, through adopting this sensor, has greatly improved the precision and the accuracy of data measurement.
The internal signal processor of the DPS310 converts the output of the pressure and temperature sensor elements into a 24-bit result, each cell is individually calibrated, and calibration coefficients calculated in this process are stored in a calibration register, and these coefficients are used for applications of converting the measurement results into high-precision pressure and temperature values, so that temperature and water pressure can be measured at a time by one of the temperature sensing chips U3, which is efficient and convenient.
In another embodiment of the present invention, as shown in fig. 14, the voltage converting circuit 120 includes a voltage stabilizing chip U1, an input pin of the voltage stabilizing chip U1 is connected to a power supply output terminal 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 numeral of the power supply output terminal of the main control board 180 of the washing machine is VIN. An input pin of the voltage regulation chip U1 is a second pin of the voltage regulation chip U1, an output pin of the voltage regulation chip U1 is a third pin of the voltage regulation chip U1, and voltage output by a power supply output end of the washing machine main control board 180 is converted by the voltage regulation chip U1 and then is output by 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 TLV 70433.
In another embodiment of the present invention, as shown in fig. 14 to 15, the voltage converting circuit 120 further includes an input protection circuit 121, and the input protection circuit 121 is disposed between the power supply output terminal of the main control board 180 of the washing machine and the input pin of the regulator chip U1.
In another embodiment of the present invention, as shown in fig. 14, the input protection circuit 121 includes a self-healing fuse JZ1, and two ends of the self-healing fuse JZ1 are respectively connected to the power supply output terminal of the main control board 180 of the washing machine and the input pin of the voltage regulation chip U1. When the current passing through the self-recovery fuse JZ1 is too large, the resistance 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, a cathode of the protection diode D1 is connected to the input pin of the zener chip U1, and an anode of the protection diode D1 is grounded. The protection diode D1 is used to prevent the subsequent circuit from being damaged by the surge or spike 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 terminal of the main control board 180 of the washing machine.
Specifically, a serial port input pin of the main control chip U2 is an RX pin, and a 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 to the third pin of the main control chip U2, and the third pin of the connection port J4 is connected to the second pin of the main control chip U2. Thus, parameters of the water pressure and temperature detection chip U3 are configured through the communication mode of I2C, the main control chip U2 obtains water pressure and temperature information detected by the water pressure and temperature detection chip U3 through the communication mode of I2C, and the main control chip U2 analyzes the water pressure information to obtain water level height information in a water tub of the washing machine through the received water pressure and temperature information and obtains water temperature information through analyzing the temperature information. Then, the main control chip U2 sends the water level height information and the water temperature information to the washing machine main control board 180 through the connection port J4, so that the washing machine main control board 180 controls the washing machine to work according to the water level height information and the water temperature information.
In another embodiment of the present invention, as shown in fig. 14-15, the detection circuit 100 further includes a vibration detection circuit 150, the vibration detection circuit 150 is connected to the main control circuit 130 and the voltage conversion circuit 120, the vibration detection circuit 150 is configured to detect vibration information of the washing machine, transmit the vibration information to the main control circuit 130, and transmit the vibration information to the main control board 180 of the washing machine through the interface circuit 110 by the main control circuit 130.
Specifically, the vibration detection circuit 150 includes a vibration detection chip U4, the first pin of the vibration detection chip U4 is connected to the third pin of the voltage stabilization chip U1, the fourteenth pin of the vibration detection chip U4 is connected to the twelfth pin of the main control chip U2, and the thirteenth pin of the vibration detection chip U4 is connected to the eleventh pin of the main control chip U2. In this embodiment, the model of the vibration detection chip U4 is preferably ADXL345 or the same model thereof.
In another embodiment of the present invention, as shown in fig. 16 to 17, the water pressure and temperature detecting circuit 140 includes an internal detecting circuit 141 and an external detecting circuit 142, and both 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 water tub of the washing machine, and the external detection circuit 142 is used for detecting the atmospheric pressure outside the water 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 reference number of the water pressure and temperature detecting chip of the built-in detecting circuit 141 is U3, that is, the built-in detecting circuit 141 includes a water pressure and temperature detecting chip U3. The external detection circuit has a water pressure and temperature detection chip labeled as U5, i.e., the external detection circuit 142 includes a water pressure and temperature detection chip U5.
The water pressure and temperature detection chip U3 and the third pin and the fourth pin of 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.
Wherein, the fifth pin of water pressure and temperature detection chip U3 is unsettled, makes I2C of water pressure and temperature detection chip U3 is 1 from the most significant bit of address, the fifth pin ground connection of water pressure and temperature detection chip U5 makes I2C of water pressure and temperature detection chip U5 is 0 from the least significant bit of address, thereby makes main control chip U2 can distinguish according to following the address water pressure and temperature detection chip U3 with water pressure and temperature detection chip U5, and can realize alone main control chip U2 with water pressure and temperature detection chip U3 with water pressure and temperature detection chip U5 communication.
Further, in practical applications, the detection end of the water pressure and temperature detecting chip U3 of the built-in detection circuit 141 is located at the bottom of the water tub of the washing machine, that is, the pressure of the water in the water tub is opposite to the detection end of the water pressure and temperature detecting chip U3 of the built-in detection circuit 141, the pressure is actually the pressure of the water plus the pressure of the atmospheric pressure, and the main control chip U2 converts the sum of the pressure of the water and the atmospheric pressure into water level height information in the water tub and sends the information to the main control board of the washing machine.
If the washing machine is located on a higher floor, such as twenty-first floor, the difference between the atmospheric pressure of twenty-first floor and the atmospheric pressure of twenty-second floor is too large, and if the sum of the water pressure and the atmospheric pressure is directly converted into the height information of the water level in the water bucket in the twenty-first floor, a large error is generated, so that the detection of the water level in the washing machine is inaccurate, and the work of the washing machine is influenced. Therefore, in the present application, by providing the external detection circuit 142 and making the water pressure and temperature detection chip U5 of the external detection circuit 142 be outside the region covered by the water level of the water tub, so that the external detection circuit 142 detects the atmospheric pressure outside the water tub of the washing machine, 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 height information of the actual water level inside the water tub, so that the internal detection circuit 141 and the external detection circuit 142 are provided to eliminate the influence of the external atmospheric pressure change on the water level detection inside the water tub in the washing machine, thereby realizing accurate measurement, 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 obtaining external atmospheric pressure information outside the washing machine through the detection sensor for the washing machine.
Specifically, the water pressure inside the tub of the washing machine is detected by the built-in detection circuit 141, i.e., the actual tub pressure information inside the tub of the washing machine is acquired by the built-in detection circuit 141.
The external atmospheric pressure outside the water tub of the washing machine is detected by the external detection circuit 142, that is, the external atmospheric pressure information outside the washing machine is obtained 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: obtaining external atmospheric pressure information outside the washing machine through the water pressure and temperature detection circuit 140 in the detection sensor for the washing machine;
step S220: acquiring actual tub pressure information in a tub of the washing machine through the water pressure and temperature detection circuit 140 of the washing machine detection sensor, wherein the actual tub pressure information includes the external atmospheric pressure information and actual tub water level pressure information;
step S230: acquiring, by the main control circuit 130 in the washing machine detection sensor, the actual tub water level pressure information according to a difference between the actual tub pressure information and the external atmospheric pressure information;
step S240: and calculating absolute water level height information in the water containing barrel through pressure water level conversion according to the actual water containing barrel water level pressure information by the main control circuit 130 in the detection sensor for the washing machine.
In another embodiment of the present invention, based on the washing machine tub water level control system, the step S200 specifically includes:
step S211: the washing machine drainage information after the washing machine is powered on is obtained through a main control circuit in the detection circuit, and the washing machine drainage information is used for controlling a drainage valve of the washing machine to be opened so that the washing machine drains water in a water containing barrel;
step S212: acquiring the pressure information of a water-holding barrel in drainage in a water-holding barrel of the washing machine in real time through a main control circuit 130 in the detection sensor for the washing machine, wherein each time point in the drainage process corresponds to one pressure information of the water-holding barrel in drainage respectively;
step S213: and judging whether the pressure information of the water containing barrel in each drainage water in the drainage water process changes in real time through a main control circuit 130 in the detection sensor for the washing machine, and if the pressure information of the water containing barrel in each drainage water is judged to be kept unchanged and continuously exceeds the preset drainage finishing time, setting the current pressure information of the water containing barrel in the drainage water as the external atmospheric pressure information.
In the step S213: after the defining the current draining water bucket pressure information as the external atmospheric pressure information, the method further comprises:
step S214: acquiring empty barrel pressure information in a water barrel in real time through a detection sensor for the washing machine, wherein each time point in the acquisition process corresponds to one empty barrel pressure information respectively;
step S215: judging whether the change of the pressure information of each empty barrel exceeds a preset pressure change value in a preset time period through the main control circuit 130 in the detection sensor for the washing machine; if the pressure information is judged to be the external atmospheric pressure information, the changed empty barrel pressure information is set 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 of the 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.
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 from the actual tub pressure information through the main control circuit 130 in the washing machine detection sensor;
the step S222 specifically includes: comparing and analyzing 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, 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 out a water supply and drainage abnormal warning.
In another embodiment of the present invention, based on the washing machine tub water level control system, the 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;
step S420 specifically includes: the actual water temperature information in the water containing barrel of the washing machine is obtained in real time through the water pressure and temperature detection circuit 140 in the detection sensor for the washing machine;
step S430 specifically includes: the main control circuit 130 in the detection sensor for the washing machine compares the actual water temperature information with the target heating temperature information, and judges whether the actual water temperature information is matched with the target heating temperature information, if so, the main control circuit 130 in the detection sensor for the washing machine generates a heating stop instruction, and the heating stop instruction is used for controlling the washing machine to stop heating the water in 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 through the main control circuit 130 in the detection sensor for the washing machine;
step S422 specifically includes: the temperature change information and the preset normal heating temperature change information are compared and analyzed through the main control circuit 130 in the detection sensor for the washing machine, if the temperature change information is not matched with the normal heating temperature change information, a temperature heating abnormal instruction is generated, and the temperature heating abnormal instruction is used for controlling the washing machine to send out a temperature heating abnormal warning.
Of course, the design calculation method of the present invention may also be transferred to the washing machine main control board for performing, that is, the washing machine uses the detection sensor to detect only the temperature information of the pressure gauge and send the temperature information to the washing machine main control board, and the washing machine main control board processes the data. Therefore, the present invention is not limited to the specific embodiments, which are set by the person skilled in the art according to the actual needs.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (15)

1. A method for controlling water level of a tub of a washing machine, comprising the steps of:
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 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 containing barrel of the washing machine;
and comparing the absolute water level height information in the water containing barrel with the target water level height information, judging whether the absolute water level height information in the water containing barrel is not less than the target water level height information, if so, generating a water supply and drainage stopping instruction, wherein the water supply and drainage stopping instruction comprises a water supply stopping instruction and a drainage stopping instruction, the water supply stopping instruction is used for controlling the washing machine to stop supplying water into the water containing barrel, and the drainage stopping instruction is used for controlling the washing machine to stop draining water to the outside of the washing machine.
2. The method of claim 1, wherein the obtaining of the absolute water level height information in the tub of the washing machine specifically comprises:
obtaining external atmospheric pressure information outside the washing machine;
acquiring actual water barrel pressure information in a water barrel of a washing machine, wherein the actual water barrel pressure information comprises the external atmospheric pressure information and actual water barrel water level pressure information;
acquiring actual water tub water level pressure information according to the difference between the actual water tub pressure information and the external atmospheric pressure information;
and obtaining absolute water level height information in the water containing barrel through pressure and water level conversion calculation according to the actual water containing barrel water level pressure information.
3. The method of claim 2, wherein the obtaining external atmospheric pressure information outside the washing machine specifically comprises:
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.
4. The method of claim 2, wherein the obtaining external atmospheric pressure information outside the washing machine specifically comprises:
acquiring washing machine drainage information after the washing machine is powered on, wherein the washing machine drainage information is used for controlling a drainage valve of the washing machine to be opened so that the washing machine drains water in a water bucket;
acquiring water barrel pressure information in drainage in a water barrel of the washing machine in real time in a drainage process, wherein each time point in the drainage process corresponds to one water barrel pressure information in drainage respectively;
and judging whether the pressure information of the water containing barrel in each drainage water in the drainage process changes in real time, and if the pressure information of the water containing barrel in each drainage water is judged to be kept unchanged and continuously exceeds the preset drainage finishing time, setting the current pressure information of the water containing barrel in the drainage water as the external atmospheric pressure information.
5. The washing machine tub water level control method of claim 4, wherein the defining the current drain tub pressure information as the external atmospheric pressure information further comprises:
acquiring empty barrel pressure information in a water containing barrel in real time, wherein each time point in the acquisition process corresponds to one empty barrel pressure information;
judging whether the change of the pressure information of each empty barrel exceeds a preset pressure change value within a preset time period; if the pressure information is judged to be the external atmospheric pressure information, the changed empty barrel pressure information is set as the external atmospheric pressure information.
6. The washing machine tub water level control method of claim 2, wherein the pressure water level conversion calculation is performed based on the following formula:
Figure FDA0002517072710000021
wherein h is absolute water level height information in the water tub, PMeasuringFor the actual tub pressure information, PQi (Qi)For the external atmospheric pressure information, ρ 1000kg/m3，g＝9.8m/s2。
7. The method of claim 2, wherein the obtaining of the actual tub pressure information within the tub further comprises:
obtaining pressure change speed information of the actual water containing barrel pressure information according to the actual water containing barrel pressure information;
and comparing and analyzing the pressure variation speed information with preset normal water supply and drainage speed information, and if the pressure variation speed information is not matched with the normal water supply and drainage variation speed information, generating a water supply and drainage abnormal instruction, wherein the water supply and drainage abnormal instruction is used for controlling the washing machine to send out a water supply and drainage abnormal warning.
8. The method for controlling water level of tub of washing machine according to claim 1, further comprising after obtaining information of absolute water level height in tub of washing machine:
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 a water drum;
acquiring actual water temperature information in a water containing barrel of the washing machine in real time;
and 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, if so, generating a heating stop instruction, wherein the heating stop instruction is used for controlling the washing machine to stop heating the water in the water containing barrel.
9. The method for controlling water level of washing machine tub according to claim 8, further comprising the step of, after acquiring the actual water temperature information in the washing machine tub in real time:
obtaining temperature change information of the actual water temperature information according to the actual water temperature information;
and comparing and analyzing the temperature change information with preset normal heating temperature change information, if the temperature change information is not matched with the normal heating temperature change information, generating a temperature heating abnormal instruction, wherein the temperature heating abnormal instruction is used for controlling the washing machine to send out a temperature heating abnormal warning.
10. The method for controlling the water level of the water containing barrel of the washing machine is characterized by being based on a water level control system of the water containing barrel of the washing machine, wherein the water level control system of the water containing barrel of the washing machine comprises a washing machine main board control device and a detection sensor for the washing machine which are sequentially connected; the washing machine tub water level control method 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, 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 containing barrel of the washing machine through a detection sensor for the washing machine;
the washing machine is characterized in that the washing machine is provided with a detection sensor, the detection sensor is used for comparing absolute water level height information in the water containing barrel with target water level height information, whether the absolute water level height information in the water containing barrel is not smaller than the target water level height information is judged, the target water level height information is sent to the washing machine main board control device, if the absolute water level height information is judged to be larger than the target water level height information, a water supply and drainage stopping instruction is generated through the detection sensor for the washing machine, wherein the water supply and drainage stopping instruction comprises a water supply stopping instruction and a drainage stopping instruction, the water supply stopping instruction is used for controlling the washing machine to stop supplying water into the water containing barrel, and the drainage stopping.
11. The washing machine tub water level control method as claimed in claim 10, wherein the washing machine main board control device includes a washing machine main control board, a water inlet valve, a water discharge valve, and a heating device; the washing machine main control board is connected with the detection sensor for the washing machine, and the water inlet valve, the water discharge valve and the heating device are all connected with the washing machine main control board.
12. The method of claim 11, wherein the detection sensor for the washing machine comprises a detection circuit, the detection circuit comprising:
the interface circuit is connected with the washing machine main control board;
a voltage conversion circuit connected to the interface circuit;
the master control circuit is connected with the voltage conversion circuit and the interface circuit;
and 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 washing machine mainboard through the interface circuit.
13. The method of claim 12, wherein the pressure and temperature detection circuit comprises a built-in detection circuit and an external detection circuit, and the built-in detection circuit and the external detection circuit are both connected with the main control circuit; the built-in detection circuit is used for detecting actual water containing barrel pressure information in a water containing barrel of the washing machine, and the external detection circuit is used for detecting external atmospheric pressure information outside the water containing barrel of the washing machine.
14. The washing machine tub water level control method of claim 12, wherein the washing machine detection sensor further comprises a housing, a pressure conductive elastic membrane, a pressure conductive medium, and a pressure detection PCB board; 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 installed in the shell and sealed with the bottom opening, the pressure conducting medium is contained in the shell and is arranged to be pressed on the pressure conducting elastic membrane, the pressure detection PCB is installed in the shell and is arranged to be pressed on the pressure conducting medium, and the detection end of the pressure detection PCB extends into the pressure conducting medium, so that external pressure is transmitted to the detection end of the pressure detection PCB after sequentially passing through the pressure conducting elastic membrane and the pressure conducting medium, and the pressure detection PCB detects the external pressure.
15. The washing machine tub water level control method as claimed in claim 14, wherein the washing machine detection sensor further includes an elastic film pressing member installed in the housing; the pressure conduction elastic membrane is characterized in that the middle of the elastic membrane pressing piece is provided with a clearance hole for conducting the pressure conduction 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 conduction elastic membrane.
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