CN113897764A - Upper drain washing machine and drain control method thereof - Google Patents

Upper drain washing machine and drain control method thereof Download PDF

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Publication number
CN113897764A
CN113897764A CN202010575883.4A CN202010575883A CN113897764A CN 113897764 A CN113897764 A CN 113897764A CN 202010575883 A CN202010575883 A CN 202010575883A CN 113897764 A CN113897764 A CN 113897764A
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China
Prior art keywords
water level
water
level difference
drainage
value
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CN202010575883.4A
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CN113897764B (en
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矫青
张庆君
梁青
李涛
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Chongqing Haier Washing Machine Co Ltd
Haier Smart Home Co Ltd
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Chongqing Haier Washing Machine Co Ltd
Haier Smart Home 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
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/18—Washing liquid level
    • 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
    • D06F2105/08—Draining of washing liquids
    • 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 relates to the technical field of washing machines, and particularly provides an upper drainage washing machine and a drainage control method thereof, aiming at automatically judging whether a siphon phenomenon occurs on the premise that the upper drainage washing machine receives a user stop instruction in a normal washing process. The method includes stopping washing; starting to drain water; judging whether the condition of stopping water drainage is met; if the water content meets the requirement, stopping draining; determining a maximum water level value lw of a water bucket of an upper drainage laundry machine in a first period amaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1(ii) a Judging the first water level difference value delta lw1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1(ii) a And determining whether the siphon phenomenon occurs according to the judgment result and executing corresponding control operation. The drainage control method can automatically judge that the upper drainage washing machine is onWhether siphon phenomenon occurs and corresponding control operation is executed on the premise that a user stop instruction is received in the normal washing process, and the defects in the prior art are overcome.

Description

Upper drain washing machine and drain control method thereof
Technical Field
The invention belongs to the technical field of washing machines, and particularly provides an upper draining washing machine and a draining control method thereof.
Background
The washing machine generally includes an upper drain washing machine and a lower drain washing machine according to the drainage mode, and in comparison, the upper drain washing machine has a lower requirement for the installation environment, so that the washing machine is widely favored by users.
However, in some special situations, such as the upper drain washing machine during normal washing, when a user wants to add clothes to or remove a part of clothes from the washing machine, the user needs to pause washing and unlock the door for the user to perform corresponding operations. In this case, in order to prevent the water in the tub from flowing out of the door when the user opens the door, the draining needs to be started to drain the water in the tub before the door is unlocked. Since the washing machine continues washing after the user finishes the operation, it is not desirable to completely drain the water in the tub, and for this reason, a controller of the washing machine presets a minimum allowable water level value, and stops draining when the water level in the tub reaches the minimum allowable water level value.
In the drainage process, if the washing machine is not installed normally, so that the opening of the drainage pipe is lower than the minimum allowable water level value in the water bucket, negative pressure is formed in the drainage pipe due to the difference of internal pressure and external pressure of the drainage pipe, and a 'siphon phenomenon' is generated. Under the action of siphonage, water in the water containing barrel can be completely drained, meanwhile, the controller learns that water level in the water containing barrel is smaller than the minimum allowable water level value and then water starts to enter, so that the phenomenon that the washing machine enters water and drains water at the same time is generated, and the washing machine cannot work normally.
Therefore, how to automatically determine whether the upper drainage washing machine has siphonage or not is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
The invention provides a drainage control method of an upper drainage washing machine, which aims to automatically judge whether a siphonage phenomenon occurs on the premise that the upper drainage washing machine receives a user stop instruction in a normal washing process.
The invention relates to a drainage control method of an upper drainage washing machine, which is implemented on the premise of receiving a user stop instruction in a normal washing process, and comprises the following steps: stopping washing; starting to drain water; judging whether the condition of stopping water drainage is met; if the water content meets the requirement, stopping draining; determining a maximum level value lw of a tub of the upper drain laundry machine for a first period amaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1(ii) a Judging the first water level difference delta lw1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1(ii) a And determining whether the siphon phenomenon occurs according to the judgment result and executing corresponding control operation.
In a preferable aspect of the drain control method of the present invention, the step of determining whether or not a siphon phenomenon occurs according to the determination result includes: if the first water level difference value delta lw1 is larger than a preset first water level difference threshold value delta lwset1It is determined that the siphon phenomenon occurs, otherwise it is determined that the siphon phenomenon does not occur.
In a preferred embodiment of the above-mentioned drain control method of the present invention, the maximum level value lw of the tub of the upper drain laundry machine in the first period a is determinedmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1The method specifically comprises the following steps: determining the maximum water level value lw of the water buckets of the n groups of the upper draining washing machines in the first period amaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1N is not less than 2; "judge the first water level difference Δ lw1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1The method specifically comprises the following steps: judging the first water level difference value delta lw of each group1Whether or not it is greater than presetFirst water head difference threshold value delta lwset1。
In a preferred embodiment of the above-mentioned drain control method of the present invention, the maximum level value lw of the tub of the upper drain laundry machine in the first period a is determinedmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1The method specifically comprises the following steps: determining a maximum level value lw of a water tub of the upper drain laundry machine during a first period a after a second period mmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1。
In a preferred embodiment of the above-mentioned drain control method of the present invention, the maximum level value lw of the water tub of the upper drain laundry machine in the first period a after the second period m is determinedmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1The method specifically comprises the following steps: determining the maximum water level value lw of n groups of water buckets of the upper draining washing machine in the first period a after the second period mmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1N is not less than 2; "judge the first water level difference Δ lw1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1The method specifically comprises the following steps: judging the first water level difference value delta lw of each group1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1。
In a preferred embodiment of the above-described drain control method of the present invention, after the step of "stopping washing", and before the step of "starting drain", the drain control method further includes: obtaining a first water level value lw of the water containing bucket1(ii) a In the case of "determining that the siphon phenomenon has occurred", the step of "performing the corresponding control operation" includes: draining water in the water containing barrel, and then, water to the first water level value lw1The water supply is stopped and the washing is restarted.
In a preferred embodiment of the above-described drain control method according to the present invention, the step of "executing a corresponding control operation" in a case where "it is determined that no siphon phenomenon occurs" includes: the washing was started by backwashing.
In a preferable aspect of the above drainage control method of the present invention, the step of determining whether or not the drainage stop condition is satisfied includes: obtaining a second water level value lw of the water tub2(ii) a Judging the second water level value lw2Whether the water level is less than or equal to the preset water level value lw of the water stop and drainage targettv(ii) a If so, determining that a condition for stopping water drainage is met, otherwise, returning to the step of acquiring a second water level value lw of the water containing barrel2"is performed.
In a preferable aspect of the above drainage control method of the present invention, the step of determining whether or not the drainage stop condition is satisfied includes: obtaining a second water level value lw in the water containing barrel2(ii) a Determining the second water level value lw2And the target water level value lw of water stop and drainagetvSecond water level difference Δ lw therebetween2(ii) a Judging the second water level difference delta lw2Whether the water level difference is less than or equal to a preset first water level difference threshold value delta lwset2(ii) a If so, determining that a condition for stopping water drainage is met, otherwise, returning to obtain' a second water level value lw of the second water barrel2"is performed.
In a preferable embodiment of the drainage control method of the present invention, the second time period m has a value ranging from 5 seconds to 12 seconds, and/or the first time period a has a value ranging from 5 seconds to 12 seconds.
The upper drainage washing machine starts to implement the drainage control method of the invention on the premise of receiving a user stop instruction in the normal washing process, and the drainage control method comprises the following steps: stopping washing; starting to drain water; judging whether the condition of stopping water drainage is met; if the water content meets the requirement, stopping draining; determining a maximum level value lw of a tub of the upper drain laundry machine for a first period amaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1(ii) a Judging the first water level difference delta lw1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1(ii) a It is determined whether or not a siphon phenomenon occurs according to the determination result and a corresponding control operation is performed.
The drainage control method can automatically judge whether the upper drainage washing machine has siphonage or not and execute corresponding control operation on the premise of receiving a user stop instruction in the normal washing process, and overcomes the defects in the prior art.
Drawings
FIG. 1 is a flow chart of the steps of a first embodiment of a drainage control method of the present invention;
FIG. 2 is a flowchart of the steps of a second embodiment of the drainage control method of the present invention;
FIG. 3 is a flowchart of the steps of a third embodiment of the drainage control method of the present invention;
FIG. 4 is a flowchart of the steps of a fourth embodiment of the drainage control method of the present invention;
FIG. 5 is a flowchart of the steps of a fifth embodiment of the drainage control method of the present invention;
FIG. 6 is a flowchart of the steps of a sixth embodiment of the drainage control method of the present invention;
fig. 7 is a flowchart of the steps of a drain control method of the present invention according to a seventh embodiment.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present application, a "controller" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It should be noted that the drain control method of the present invention is implemented on the premise that the upper drain washing machine receives a user stop instruction in the normal washing process. In the normal washing process of the washing machine, sometimes a user needs to add clothes to be washed into the washing machine or take out part of the clothes being washed from the washing machine, in this case, the user usually sends a stop instruction to a controller of the upward drainage washing machine by using a washing stop button on a control panel, and the controller starts the drainage control method provided by the invention after receiving the stop instruction.
Referring to fig. 1, the main steps of the drainage control method of the present invention in the first embodiment include:
and S100, stopping washing.
It should be noted that the controller stops washing after receiving the stop command, and at this time, the controller may completely exit the washing process and directly return to the initial state of the washing machine, or may store the washing mode and washing time that are being performed before the stop.
And S200, starting draining.
The controller controls a drain pump of the upper drain washing machine to start draining.
And S300, judging whether the condition of stopping water drainage is met.
If yes, the step S400 is entered, otherwise, the step S300 is returned to continuously judge whether the condition of stopping water drainage is met.
And S400, stopping draining.
S500, determining the maximum water level value lw of the water barrel in the first period amaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1。
It should be noted that the specific value of the first time interval a depends on the power of the upper drainage washing machine, the washing mode, and other factors, and experiments prove that for the current common household washing machine, the value range of the first time interval a may be between 5 seconds and 12 seconds, and further, the first water level difference Δ lw determined when a is 10 seconds1Preferably. In addition, a maximum water level value lw within the tubmaxAnd minimum water level value lwminThe water level sensor arranged in the water containing barrel is used for obtaining the water level, the obtained result is transmitted to the controller in a wired or wireless communication mode and the like, and the controller calculates the difference value of the two modes to determine the first water level difference value delta lw1。
S600, judging the first water level difference delta lw1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1。
Wherein the first water level difference threshold value Deltalwset1The method is characterized in that the method is a preset allowable detection deviation value of the water level sensor and aims to compensate the influence of external factors such as water flow shaking on the detection accuracy of the water level sensor. First water head difference threshold value delta lwset1The specific value of (a) depends on the structure, working principle and other factors of the water level sensor, and those skilled in the art can determine the value when the first water level difference threshold value Δ lw is reached according to the actual situation of the water level sensorset1The detection value of the water level sensor is an ideal value when the detection value is equal to zero.
And S700, determining whether a siphon phenomenon occurs according to the judgment result and executing corresponding control operation.
The drainage control method can automatically judge whether the upper drainage washing machine has siphonage or not and execute corresponding control operation on the premise of receiving a user stop instruction in the normal washing process, and overcomes the defects in the prior art.
Referring to fig. 2 in detail, the step S700 of "determining whether or not the siphon phenomenon occurs according to the determination result" includes the steps of: if so (first water level difference Deltalw1Greater than a preset first water level difference threshold value delta lwset1) Then, the process proceeds to step S701, otherwise (first water level difference Δ lw)1Is less than or equal to a preset first water head difference threshold value delta lwset1) Then, the process proceeds to step S702.
And S701, determining that a siphon phenomenon occurs.
And S703, determining that no siphon phenomenon occurs.
And executing corresponding control operation after determining whether the siphon phenomenon occurs. The corresponding control operations referred to herein may be: when the siphon phenomenon is determined to occur, the controller can send a clear alarm to a user to prompt the user that the washing machine is not installed normally, and the user can adopt different treatment modes according to actual conditions. The following steps can be also included: the user reinstalls the washing machine to meet the installation standard requirement, and certainly, the user can also completely quit the existing washing mode, reset the control mode of the washing machine to enable the control mode to be in the initial state, and then select the washing mode, the duration and the like to restart the washing.
Of course, in order to further increase the level of intelligence of the upper drain washing machine, the drain control method of the present invention may further include a subsequent step for automatically draining the malfunction, and refer to the flowchart of the steps of the second embodiment of the drain control method of the present invention in fig. 2. In the second embodiment, an automatic processing scheme is provided for the upper drainage washing machine under the condition that the siphonage phenomenon occurs and the siphonage phenomenon does not occur. It should be noted that, compared with the first embodiment, the second embodiment is different only in the control operation performed according to different situations after determining whether the siphon phenomenon occurs in the washing machine, so only the difference between the two embodiments is described in detail herein, and the same points can refer to the description in the first embodiment and are not repeated herein.
Referring to fig. 2, the drain control method of the present embodiment further includes, after the washing is stopped at step S100 and before the draining is started at step S200:
s101, obtaining a first water level value lw of a water containing barrel of an upper draining washing machine1. And similarly, the first water level value is detected by a water level sensor arranged in the water barrel and then is transmitted to the controller in a wired or wireless communication mode, and the controller stores the first water level value for subsequent steps.
In the case where it is determined in step S701 that the siphon phenomenon has occurred, the step of "performing the corresponding control operation" includes:
s702, draining water in a water barrel of the upper-drainage washing machine, and then, draining the water until the water level in the water barrel reaches a first water level value lw1The water supply is stopped and the washing is restarted.
With continued reference to fig. 2, in the case where it is determined in step S703 that the siphon phenomenon has not occurred, the step of "performing a corresponding control operation" includes:
step S704, the washing is restarted.
Further, in order to improve the accuracy of determining whether the upper drain washing machine has siphonage, steps S500 and S600 in the second embodiment of the drain control method of the present invention are modified in the third embodiment, and detailed description is given to the flowchart of steps in the third embodiment of the drain control method of the present invention in fig. 3. For convenience of distinction, step numbers S500 'and S600' are used in the third embodiment to indicate steps different from those in the second embodiment, and step numbers in the second embodiment are used for the same steps, and detailed description is omitted.
Referring to fig. 3, step S500' of the drainage control method of the third embodiment is specifically: determining the maximum water level value lw of n groups of water buckets in the first period amaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1N is more than or equal to 2, namely n is a positive integer which is more than or equal to 2.
Accordingly, step S600' of the drainage control method of the third embodiment is specifically: judging the first water level difference value delta lw of each group1Whether both are larger than a preset first water level difference threshold value delta lwset1。
It is conceivable that, compared with the second embodiment, the third embodiment collects more values in step S500 ', and accordingly the conditions for the determination in step S600' are more strict, and of course, the determination result is more accurate.
Furthermore, in order to improve the accuracy of the drainage control method of the present invention, step S500' in the third embodiment of the drainage control method of the present invention is modified in the fourth embodiment, and detailed description is provided in the step flowchart of the fourth embodiment of the drainage control method of the present invention in fig. 3. For the sake of convenience of distinction, step number S500 "is adopted in the fourth embodiment to indicate the step different from that in the third embodiment, and step numbers in the third embodiment are adopted for the same steps, and detailed description is omitted.
Referring to fig. 4, step S500 ″ of the drainage control method in the fourth embodiment is specifically: determining the maximum water level value lw of n groups of water buckets in the first period a after the second period mmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1N is more than or equal to 2, namely the value of n is a positive integer which is more than or equal to 2.
In contrast to the third embodiment, the fourth embodiment determines n sets of first water level differences Δ lw1Before the washing machine is onKeeping the second time interval m in the former state to make each group of first water level difference delta lw1The method is closer to the actual value, so that the accuracy of the judgment result can be improved.
In addition, it should be noted that the specific value of the second period m depends on the functions of the washing machine, the washing mode, the actual installation position, and other factors, and can be determined by those skilled in the art in practice. The second time period m may be between 5 seconds and 12 seconds for a common household washing machine, and preferably, m is 10 seconds. It is understood that the specific value of the second time interval m does not limit the protection scope of the present invention.
From the above, the fourth embodiment adds a part of the limiting condition (after determining the first water level difference Δ lw) to the step S500' of the third embodiment1Previously, the washing machine is maintained in the current state for the second period m), it is understood that this part of the limitation conditions may also be directly added to the step S500 of the second embodiment, which is described in detail below with reference to the step flow chart of the fifth embodiment of the drain control method of the present invention in fig. 5, and here, only the difference steps of the fifth embodiment with respect to the second embodiment are described here, and the same steps of the fifth embodiment are not described again. Moreover, for ease of distinction, the distinguishing steps of the fifth embodiment are identified herein by the reference numeral S500' ", and like steps are followed by the reference numerals of the second embodiment.
Referring to fig. 5, step S500' ″ of the drain control method of the fifth embodiment is specifically: determining a maximum water level value lw of the tub in a first period a after the second period mmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1。
Referring to fig. 1-5, step S300 of the drainage control method of the first five embodiments is to determine whether the condition for stopping drainage is satisfied, and a specific determination method is described in detail with reference to fig. 6, and referring to the flowchart of the steps of the sixth embodiment of the drainage control method of the present invention in fig. 6, except for step S300, the drainage control method of the sixth embodiment is the same as the fifth embodiment, and the same steps are numbered along with the steps of the fifth embodiment. Only the difference between the two embodiments is described in detail herein, and the same steps between the two embodiments are not described again, and those skilled in the art can fully implement the embodiments in combination with the descriptions of the five embodiments. It should be noted that the sixth embodiment is described on the basis of the fifth embodiment, and it is understood that the specific determination method of step S300 in the sixth embodiment is also applicable to the first, second, third and fourth embodiments.
Referring to fig. 6, step S300 of the drain control method of the sixth embodiment specifically includes:
s301, acquiring a second water level value lw of the water bucket2；
S302, judging a second water level value lw2Whether the water level is less than or equal to the preset water level value lw of the water stop and drainage targettv. Wherein, the target water level value lw of the water stoptvThe water level sensor is a critical value which is preset in the controller and can stop draining, the critical value is set and finished before leaving a factory according to parameters such as power, working mode and the like of the washing machine under the normal condition, and the controller controls to stop draining when the current water level value detected by the water level sensor reaches the target water level value for stopping draining.
If so (second water level value lw2Is less than or equal to the target water level value lw of water stop and drainagetv) Step S303 is entered, if not (second water level value lw)2Is greater than the target water level value lw of water stop and drainagetv) Returning to step S301 to continue to acquire the second water level value lw of the tub2。
And S303, determining that the condition of stopping water drainage is met.
In addition to the sixth embodiment, the drain control method according to the seventh embodiment of the present invention provides another method for determining whether the stop drain condition is satisfied, and is described in detail with reference to fig. 7, which is a flowchart illustrating steps of the seventh embodiment of the drain control method according to the present invention. Similarly, the seventh embodiment is also described on the basis of the fifth embodiment, in order to distinguish from the sixth embodiment, step number S300' is adopted to indicate the step of determining whether the condition for stopping draining is satisfied, and the step numbers in the fifth embodiment are adopted for the other step numbers, and the detailed contents of the same steps are not repeated herein. It should be noted that the seventh embodiment is described on the basis of the fifth embodiment, and it is understood that the specific determination method of step S300' in the seventh embodiment is also applicable to the first, second, third and fourth embodiments.
In detail, referring to fig. 7, step S300' of the drain control method of the present invention in the seventh embodiment specifically includes:
s301', acquiring a second water level value lw of the water bucket2；
S302', determining a second water level value lw2And a preset water stop and drain target water level value lwtvSecond water level difference Δ lw therebetween2；
S303', judging the second water level difference value delta lw2Whether the water level difference is less than or equal to a preset second water level difference threshold value Deltalwset2。
If is ([ delta ] lw)2≤△lwset2) Then, go to step S304'; if not (Δ lw)2>△lwset2) Then, the process returns to step S301'.
S304', it is determined that the condition for stopping the drainage is satisfied.
Note that the second water head difference threshold Δ lwset2The method is characterized in that a preset allowable detection deviation value of the water level sensor is used for compensating the influence of external factors of water flow shaking on the detection accuracy of the water level sensor. Second water head difference threshold value Deltalwset2The specific value of (a) depends on the structure, working principle and other factors of the water level sensor, and those skilled in the art can determine the value when the second water level difference threshold value Δ lw is reached according to the actual situation of the water level sensorset2The detection value of the water level sensor is an ideal value when the detection value is equal to zero. In addition, the first water head threshold value and the second water head threshold value may be equal or unequal.
In addition, the present invention also provides an upper drain washing machine including a controller configured to be able to perform the above drain control method. It should be noted that the basic functional components and the operation principle of the upper drain washing machine are basically the same as those of the prior art, and those skilled in the art can completely implement the washing machine based on the prior art, so that the details are not described herein.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. A drainage control method of an upper drainage washing machine is characterized in that on the premise that the upper drainage washing machine receives a user stop instruction in a normal washing process, the drainage control method comprises the following steps:
stopping washing;
starting to drain water;
judging whether the condition of stopping water drainage is met;
if the water content meets the requirement, stopping draining;
determining a maximum level value lw of a tub of the upper drain laundry machine for a first period amaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1；
Judging the first water level difference delta lw1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1；
And determining whether the siphon phenomenon occurs according to the judgment result and executing corresponding control operation.
2. The drain control method according to claim 1, wherein the step of determining whether or not siphon phenomenon has occurred according to the determination result includes: if the first water level difference value delta lw1Greater than a preset first water level difference threshold value delta lwset1It is determined that the siphon phenomenon occurs, otherwise it is determined that the siphon phenomenon does not occur.
3. According to claim 2The drain control method is characterized in that the maximum water level value lw of the water tub of the upper drain washing machine in the first period a is determinedmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1The method specifically comprises the following steps:
determining the maximum water level value lw of the water buckets of the n groups of the upper draining washing machines in the first period amaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1，n≥2；
"judge the first water level difference Δ lw1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1The method specifically comprises the following steps:
judging the first water level difference value delta lw of each group1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1。
4. The drain control method according to claim 2, wherein a maximum level value lw of a tub of the upper drain laundry machine for a first period a is determinedmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1The method specifically comprises the following steps:
determining a maximum level value lw of a water tub of the upper drain laundry machine during a first period a after a second period mmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1。
5. The drain control method of claim 4, wherein the maximum level value lw of the tub of the upper drain laundry machine in the first period a after the second period m is determinedmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1The method specifically comprises the following steps:
determining the maximum water level value lw of n groups of water buckets of the upper draining washing machine in the first period a after the second period mmaxAnd minimum water level value lwminFirst water level difference Δ lw therebetween1，n≥2；
"judge the first water level difference Δ lw1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1The method specifically comprises the following steps:
judging the first water level difference value delta lw of each group1Whether the water level difference is larger than a preset first water level difference threshold value delta lwset1。
6. The drain control method according to any one of claims 2 to 5, further comprising, after the step of "stopping washing", before the step of "starting draining": obtaining a first water level value lw of the water containing bucket1；
In the case of "determining that the siphon phenomenon has occurred", the step of "performing the corresponding control operation" includes: draining water in the water containing barrel, and then, water to the first water level value lw1The water supply is stopped and the washing is restarted.
7. The drain control method according to any one of claims 2 to 5, wherein in the case where "it is determined that the siphon phenomenon does not occur", the step of "performing the corresponding control operation" includes: the washing was started by backwashing.
8. The drainage control method according to claim 6 or 7, wherein the step of "judging whether or not a condition for stopping drainage is satisfied" includes:
obtaining a second water level value lw of the water tub2；
Judging the second water level value lw2Whether the water level is less than or equal to the preset water level value lw of the water stop and drainage targettv；
If so, determining that a condition for stopping water drainage is met, otherwise, returning to the step of acquiring a second water level value lw of the water containing barrel2"is performed.
9. The drainage control method according to claim 6 or 7, wherein the step of "judging whether or not a condition for stopping drainage is satisfied" includes:
obtaining the water containing barrelSecond water level value lw2；
Determining the second water level value lw2And the target water level value lw of water stop and drainagetvSecond water level difference Δ lw therebetween2；
Judging the second water level difference delta lw2Whether the water level difference is less than or equal to a preset first water level difference threshold value delta lwset2；
If so, determining that the condition of stopping water drainage is met, otherwise, returning to the step of acquiring' acquiring a second water level value lw of the water containing barrel2"is performed.
10. The drainage control method according to claim 4 or 5, wherein the second period of time m ranges from 5 seconds to 12 seconds, and/or the first period of time a ranges from 5 seconds to 12 seconds.
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