Washing machine dehydration control method and drum washing machine

Abstract

The present invention provides a washing machine dehydration control method and a drum washing machine, belonging to the technical field of washing machines. The dehydration control method includes: obtaining the power value corresponding to the maximum rotational speed value in each of two adjacent dehydration stages in a dehydration program; and determining whether the dehydration program has ended based on the difference between the two power values ​​in the two adjacent dehydration stages. By obtaining the power values ​​in the two adjacent dehydration stages during the dehydration process and controlling the dehydration duration based on the power value difference, the dehydration process becomes more efficient, stable, and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of washing machines, and in particular to a washing machine dehydration control method and a drum washing machine. Background Art

[0002] During the spin cycle, the washing machine must distribute the clothes so that the eccentricity of the clothes is minimized. However, some clothes are difficult to distribute or their eccentricity changes significantly during the spin cycle. This can cause loud noise during the spin cycle. Summary of the Invention

[0003] In order to overcome the problem of high noise during the dehydration process of a washing machine in the related art, an embodiment of the present invention provides a washing machine dehydration control method and a drum-type washing machine capable of reducing dehydration noise.

[0004] A first aspect of an embodiment of the present invention provides a dehydration control method for a washing machine, wherein the washing machine includes a washing drum and a motor that drives the washing drum to rotate. The washing machine has a dehydration program, and the dehydration program includes m dehydration stages. The dehydration control method includes:

[0005] Under the dehydration program, obtaining the motor power value corresponding to the maximum speed value of the washing drum in each of two adjacent dehydration stages;

[0006] Whether the dehydration program is finished is determined according to the difference between the two motor power values ​​in two adjacent dehydration stages.

[0007] In the above technical solution, each dehydration stage includes a speed-up stage, the dehydration stage includes a first dehydration stage, the first dehydration stage includes a first speed-up stage, the first speed-up stage also includes a first speed-up sub-stage, and the target speed of the first speed-up sub-stage is the first sub-target speed;

[0008] The method also includes:

[0009] Controlling the washing machine to increase the speed to a first sub-target speed, and obtaining an average value of harmonic current in each of two adjacent time units during the speed increase process;

[0010] The difference △i between the average values ​​of the harmonic currents in two adjacent time units is calculated, and the maximum speed in the first dehydration stage is determined according to the difference △i.

[0011] In the above technical solution, the maximum rotation speed of the first dehydration stage is determined according to the difference △i, including:

[0012] If the difference Δi is greater than the first threshold, the washing machine is controlled to decelerate from the first sub-target speed, the maximum speed before the deceleration is recorded, and the maximum speed before the deceleration is determined as the maximum speed of the first spin stage;

[0013] If the difference △i is less than or equal to the first threshold, the washing machine is controlled to increase the speed from the first sub-target speed to the first target speed corresponding to the first dehydration stage, and the first target speed is determined as the maximum speed of the first dehydration stage.

[0014] In the above technical solution, the method further includes:

[0015] Determine whether the washing machine meets the requirements for ending the dehydration process after running in the first dehydration stage;

[0016] If satisfied, end the dehydration process;

[0017] If not satisfied, continue to run the next dehydration stage.

[0018] In the above technical solution, determining whether the washing machine meets the requirements for ending the dehydration process after running in the first dehydration stage includes:

[0019] Obtain a first sub-target speed n1 in the first dehydration stage and the power w1 of the washing machine when running at the first sub-target speed n1, obtain a maximum speed n2 in the first dehydration stage and the power w2 of the washing machine when running at the maximum speed;

[0020] Determine whether the requirements for ending the dehydration program are met after the first dehydration stage is run based on n1, n2, w1 and w2.

[0021] In the above technical solution, determining whether the requirements for ending the dehydration process are met after the first dehydration stage is run according to n1, n2, w1, and w2 includes:

[0022] If the absolute value of the difference between n1 and n2 is greater than the second threshold value and / or the absolute value of the difference between w1 and w2 is greater than the second threshold value, it is determined that the requirements for ending the dehydration program are not met after the first dehydration stage is run, and the next dehydration stage is continued;

[0023] If the absolute value of the difference between n1 and n2 is less than or equal to the second threshold and the absolute value of the difference between w1 and w2 is less than or equal to the second threshold, it is determined that the first dehydration stage operation meets the requirements for ending the dehydration program.

[0024] In the above technical solution, determining whether the dehydration process is finished according to the difference between two power values ​​in two adjacent dehydration stages includes:

[0025] If the difference between the two power values ​​in two adjacent dehydration stages is greater than the second threshold, the next speed-up dehydration stage is continued;

[0026] If the difference between the two power values ​​in two adjacent dehydration stages is less than or equal to the second threshold, the dehydration program is terminated.

[0027] In the above technical solution, the method further includes:

[0028] After executing the two dehydration stages, if the dehydration program termination requirement is not met, the dehydration stages with the first sub-target speed are executed twice in succession.

[0029] In the above technical solution, the method further includes:

[0030] Get the number of dehydration stages currently running;

[0031] If the number of dehydration stages is greater than the third threshold, the dehydration process ends;

[0032] If the number of dehydration stages is less than or equal to the third threshold, the washing machine is controlled to run the dehydration stages with the first sub-target speed twice again.

[0033] In the above technical solution, the dehydration stage also includes an eccentricity-weighing detection stage running before the speed-up stage;

[0034] The method also includes:

[0035] The target speed of the dehydration stage is determined according to the eccentricity value and the load-bearing value determined in the eccentricity-weighing detection stage.

[0036] In the above technical solution, the method further includes:

[0037] The same acceleration is used to increase the speed in the speed-up phase of controlling multiple dehydration phases.

[0038] A second aspect of an embodiment of the present invention provides a drum washing machine that adopts the above-mentioned dehydration control method.

[0039] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0040] In the embodiment of the present invention, the power values ​​of the washing machine in two adjacent dehydration stages during the dehydration process are obtained, and the dehydration duration is controlled according to the difference in the power values, so that the dehydration process works more efficiently, stably and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0042] Figure 1 The control flow of the embodiment of the washing machine dehydration control method of the present invention is as follows Figure 1 ;

[0043] Figure 2 The control flow of the embodiment of the washing machine dehydration control method of the present invention is as follows Figure 2 ;

[0044] Figure 3 Schematic diagram of a dehydration curve of an embodiment of a dehydration control method for a washing machine according to the present invention. DETAILED DESCRIPTION

[0045] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention as detailed in the appended claims.

[0046] Existing washing machines produce considerable noise during the dehydration process. The present invention provides a dehydration control method for a washing machine. This method obtains the power values ​​of two adjacent speed-up phases during the dehydration process and controls the dehydration duration based on the difference in power values, making the dehydration process more efficient, stable, and reliable.

[0047] The following is combined with Figure 1 -Attached Figure 3 The technical solution of this embodiment is described in detail. The following implementation methods and embodiments can be combined with each other unless there is any conflict.

[0048] Example

[0049] like Figure 1-Figure 3 As shown, a first aspect of this embodiment provides a dehydration control method for a washing machine, wherein the washing machine includes a washing drum and a motor driving the washing drum to rotate. The washing machine has a dehydration program, and the dehydration program includes m dehydration stages. The dehydration control method includes:

[0050] Under the dehydration program, obtaining the motor power value corresponding to the maximum speed value of the washing drum in each dehydration stage in two adjacent dehydration stages;

[0051] Whether the dehydration program is finished is determined according to the difference between the two motor power values ​​in two adjacent dehydration stages.

[0052] In the embodiment of the present invention, by obtaining the difference between the two motor power values ​​in two adjacent speed-up and dehydration stages, the fluctuation value of the clothes in different speed-up and dehydration stages can be reflected {the larger the difference, the more unstable the state of the clothes, thereby reflecting that the moisture content of the clothes changes greatly during the speed-up stage; conversely, the smaller the difference, the more stable the state of the clothes, thereby reflecting that the moisture content of the clothes decreases less during the speed-up stage}.

[0053] Specifically, the dehydration stage includes a first dehydration stage, the first dehydration stage includes a first speed-up stage, the first speed-up stage also includes a first speed-up sub-stage, and the target speed of the first speed-up sub-stage is a first sub-target speed;

[0054] The method further comprises:

[0055] Controlling the washing machine to increase the speed to a first sub-target speed, and obtaining an average value of harmonic current in each of two adjacent time units during the speed increase process;

[0056] The difference △i between the average values ​​of the harmonic currents in two adjacent time units is calculated, and the maximum speed in the first dehydration stage is determined according to the difference △i.

[0057] In the embodiment of the present invention, the reason why the first sub-speed-up stage with the first sub-target speed is set in the first dehydration stage and the difference △i of the average values ​​of the harmonic currents in the first sub-speed-up stage is obtained is to prevent the clothes from being increased to the target speed of the first dehydration stage with large fluctuations.

[0058] Specifically, determining the maximum rotation speed of the first dehydration stage according to the difference Δi includes:

[0059] If the difference Δi is greater than the first threshold, it indicates that the speed of the washing machine fluctuates greatly during the first sub-speed-up stage. In this case, the washing machine needs to be controlled to slow down from the first sub-target speed. The maximum speed before the speed reduction is recorded and determined as the maximum speed of the first spin stage.

[0060] If the difference △i is less than or equal to the first threshold, it means that the washing machine fluctuates little during the speed-up process of the first sub-speed-up stage. At this time, the washing machine can be controlled to speed up directly from the first sub-target speed to the first target speed corresponding to the first dehydration stage, and the first target speed is determined as the maximum speed of the first dehydration stage.

[0061] It should be noted that if Figure 2 As shown, preferably, the first sub-target speed is set to 400 rpm.

[0062] It should also be noted that the reason why current fluctuations are obtained in the first dehydration stage is that the water loss state of the clothes is unstable in the first dehydration stage, and the washing machine usually gives a large target speed in the first dehydration stage. Therefore, in order to avoid the washing machine speeding up to the target speed with a large shift, a first sub-speed-up stage is added to the first dehydration stage, and the current fluctuations during the speed-up process of the first sub-speed-up stage are obtained, so as to avoid large fluctuations in the washing machine in the first speed-up dehydration stage.

[0063] It should also be noted that when the difference Δi is greater than the first threshold, the maximum speed obtained before the speed reduction when the washing machine is controlled to reduce speed from the first sub-target speed is not the first sub-target speed; its speed value may be greater than the first sub-target speed. As can be seen above, during the first spin stage, the water loss state of the clothes is very unstable. Therefore, when the washing machine is controlled to increase speed to the first sub-target speed of 400 rpm, it may reach an overshoot speed exceeding 400 rpm, for example, increasing to 420 rpm, then falling back from 420 rpm to 400 rpm, and then reducing speed again. At this time, when the speed is reduced from the first sub-target speed, the speed before the reduction is 420 rpm. Of course, 420 rpm is just a distance indication; in the actual spin process, this speed value may also be 450 rpm or other speed values.

[0064] In any of the above embodiments, the method further comprises:

[0065] Determine whether the washing machine meets the requirements for ending the dehydration process after running in the first dehydration stage;

[0066] If satisfied, end the dehydration process;

[0067] If not satisfied, continue to run the next dehydration stage.

[0068] That is, the washing machine in the embodiment of the present invention may only perform one dehydration stage when executing the dehydration program. For example, when dehydrating clothes made of materials such as silk, only one dehydration stage may be needed to complete the dehydration requirements of the clothes, and there is no need to run multiple dehydration stages.

[0069] Specifically, the step of determining whether the washing machine meets the requirements for ending the dehydration process after running in the first dehydration stage includes:

[0070] Obtain a first sub-target speed n1 in the first dehydration stage and the power w1 of the washing machine when running at the first sub-target speed n1, obtain a maximum speed n2 in the first dehydration stage and the power w2 of the washing machine when running at the maximum speed;

[0071] Determine whether the requirements for ending the dehydration program are met after the first dehydration stage is run based on n1, n2, w1 and w2.

[0072] In the embodiment of the present invention, the first sub-target speed n1 and the maximum speed n2 are determined in the first dehydration stage in order to improve the accuracy of the determination result {ie, whether the dehydration is completed}.

[0073] Specifically, determining whether the requirements for ending the dehydration process are met after the first dehydration stage is run according to n1, n2, w1, and w2 includes:

[0074] If the absolute value of the difference between n1 and n2 is greater than the second threshold value and / or the absolute value of the difference between w1 and w2 is greater than the second threshold value, it is determined that the requirements for ending the dehydration program are not met after the first dehydration stage is run, and the next dehydration stage is continued;

[0075] If the absolute value of the difference between n1 and n2 is less than or equal to the second threshold and the absolute value of the difference between w1 and w2 is less than or equal to the second threshold, it is determined that the first dehydration stage operation meets the requirements for ending the dehydration program.

[0076] That is, after the first dehydration stage is completed, it is necessary to determine the rate of change of power and the rate of change of speed. Only when both the rate of change of power and the rate of change of speed meet the requirements can it be determined that the dehydration is completed.

[0077] In the embodiment of the present invention, n1 and n2 are obtained in the first dehydration stage because the water loss state of the clothes in the first dehydration stage is unstable. Even if the power changes slightly, the speed may change significantly. Therefore, it is inaccurate to simply determine one parameter. It is necessary to determine the rate of change of power and the rate of change of speed at the same time to improve the accuracy of the determination structure.

[0078] In any of the above embodiments, Figure 2 As shown, the process of determining whether the dehydration process is finished according to the difference between the two motor power values ​​in two adjacent dehydration stages includes:

[0079] If the difference between the two motor power values ​​in two adjacent dehydration stages is greater than the second threshold, the next speed-up dehydration stage is continued;

[0080] If the difference between the two motor power values ​​in two adjacent dehydration stages is less than or equal to the second threshold, the dehydration program is terminated.

[0081] In any of the above embodiments, after executing two dehydration stages, if the requirement for ending the dehydration program is not met, two dehydration stages with the first sub-target speed are executed consecutively.

[0082] Furthermore, the method further comprises:

[0083] Get the number of dehydration stages currently running;

[0084] If the number of dehydration stages is greater than the third threshold, the dehydration process ends;

[0085] If the number of dehydration stages is less than or equal to the third threshold, the washing machine is controlled to run the dehydration stages with the first sub-target speed twice again.

[0086] Preferably, if the dehydration times are greater than 6 times, the dehydration program ends.

[0087] In any of the above embodiments, the dehydration stage further includes an eccentricity-weighing detection stage running before the speed-up stage;

[0088] The method further comprises:

[0089] The target speed of the dehydration stage is determined according to the eccentricity value and the load-bearing value determined in the eccentricity-weighing detection stage.

[0090] That is, the eccentric weighing detection phase is run before the speed-up phase of each dehydration phase, and the eccentricity data and weighing data of the eccentric weighing phase are obtained, and the target speed value of the speed-up dehydration phase is determined based on the eccentric weighing data.

[0091] In the embodiment of the present invention, an eccentric weighing detection stage is performed before each speed-up and dehydration stage {the eccentric weighing stage is used to characterize the weight of the clothes}, and the target speed value of the dehydration stage is determined based on the eccentricity and weighing detection data. At the same time, it can also be ensured that the clothes are in a relatively even distribution state before each speed-up and dehydration, so as to reduce the fluctuation of the washing machine during the speed-up process.

[0092] In any of the above embodiments, it should also be noted that in the above multiple dehydration stages, the speed-up stage of each dehydration stage adopts the same acceleration, so as to make the obtained data more accurate and avoid uncertain factors affecting the accuracy of the judgment result.

[0093] In order to more clearly illustrate the dehydration control method in the embodiment of the present invention, Figure 2 To explain in detail:

[0094] Specifically, the dehydration program is a dehydration program performed after the drum washing machine is drained. After washing is completed, the drum washing machine performs eccentricity detection and weighing detection in sequence.

[0095] During the first eccentricity-weighing test, if the eccentricity-weighing value meets the spin speed limit, the first spin speed is run. The first spin speed target is preferably 400 rpm, and the motor power value w1 when it reaches 400 rpm is recorded. (Of course, in the case of large current fluctuations, the speed may not reach 400 rpm.) The specific actual speed value reached in the second subsequent spin speed test is related to the actual control parameters.

[0096] During the speed increase process, the average value of the harmonic current in each unit is calculated based on the change of 10 revolutions. When the difference between the average values ​​of the harmonic currents of each adjacent unit is greater than 5 (the calculated value here is a number that is converted into only integers by the collected harmonic current), the speed is reduced to the eccentricity-weighing test. If the eccentricity-weighing at this time meets the current speed increase state again, the speed is increased, and the average value of the harmonic current in the unit is calculated based on the change of 10 revolutions as a time unit.

[0097] If the difference in the average value of the harmonic currents of each adjacent unit is greater than 5, the speed is reduced again to the eccentricity-weighing detection stage, and the power w2 at the speed reached is recorded.

[0098] Calculate the difference between (w2-w1) and (n2-n1). If this difference is greater than 10, increase the spin speed again. It's important to note that the difference between w2 and w1 is the absolute value of the difference. Because the water loss from clothing is unstable during the first spin stage, w2 may be less than w1 when washing some special clothing, such as woolen clothing, which absorbs water quickly and loses water quickly.

[0099] Where n1 and n2 are the rotational speeds when the power was recorded. If the rotational speeds are the same, only the power difference is calculated.

[0100] Each time the power is calculated, the motor power values ​​of the two adjacent dehydration speeds are calculated until the difference is less than 10, then the dehydration is terminated.

[0101] If after two dehydration stages, the motor power value still does not meet the conditions, then two speed-up processes with the same speed {the speed is set to 400 rpm} are added to judge the power difference between the two times. If the difference is greater than 10, the speed-up control is continued. If it is less than 10, the dehydration process is terminated.

[0102] A second aspect of an embodiment of the present invention provides a drum washing machine, which adopts the above-mentioned dehydration control method.

[0103] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow from the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0104] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A washing machine dehydration control method, characterized in that: The washing machine includes a washing tub and a motor driving the washing tub to rotate; the washing machine has a dehydration program, the dehydration program includes m dehydration stages, and the dehydration control method includes: Under the dehydration program, obtaining the motor power value corresponding to the maximum speed value of the washing drum in each of two adjacent dehydration stages; Determine whether the dehydration program is finished according to the difference between the two motor power values ​​in two adjacent dehydration stages; The dehydration stage includes a first dehydration stage, the first dehydration stage includes a first speed-up stage, the first speed-up stage also includes a first speed-up sub-stage, and the target speed of the first speed-up sub-stage is a first sub-target speed; The dehydration control method further comprises: Controlling the washing machine to increase the speed to a first sub-target speed, and obtaining an average value of harmonic current in each of two adjacent time units during the speed increase process; Calculate the difference △i between the average values ​​of the harmonic currents in two adjacent time units, and determine the maximum speed of the first dehydration stage according to the difference △i; If the difference Δi is greater than the first threshold, the washing machine is controlled to decelerate from the first sub-target speed, the maximum speed before the deceleration is recorded, and the maximum speed before the deceleration is determined as the maximum speed of the first spin stage; If the difference △i is less than or equal to the first threshold, the washing machine is controlled to increase the speed from the first sub-target speed to the first target speed corresponding to the first dehydration stage, and the first target speed is determined as the maximum speed of the first dehydration stage.

2. The dehydration control method according to claim 1, characterized in that: The dehydration control method further comprises: Determine whether the washing machine meets the requirements for ending the dehydration process after running in the first dehydration stage; If satisfied, end the dehydration process; If not satisfied, continue to run the next dehydration stage.

3. The dehydration control method according to claim 2, characterized in that: The step of determining whether the washing machine meets the requirement for ending the dehydration process after running in the first dehydration stage includes: Obtain a first sub-target speed n1 in the first dehydration stage and the power w1 corresponding to the washing machine running at the first sub-target speed n1, obtain a maximum speed n2 in the first dehydration stage and the power w2 when the washing machine runs at the maximum speed n2; Determine whether to end the dehydration program after the first dehydration stage according to n1, n2, w1 and w2.

4. The dehydration control method according to claim 3, characterized in that: The step of determining whether the requirements for terminating the dehydration process are met after the first dehydration stage is run according to n1, n2, w1, and w2 includes: If the absolute value of the difference between n1 and n2 is greater than the second threshold value and / or the absolute value of the difference between w1 and w2 is greater than the second threshold value, it is determined that the dehydration program will not be terminated after the first dehydration stage is run, and the next dehydration stage will continue to run; If the absolute value of the difference between n1 and n2 is less than or equal to the second threshold and the absolute value of the difference between w1 and w2 is less than or equal to the second threshold, it is determined that the first dehydration stage is running and the dehydration program is ended.

5. The dehydration control method according to any one of claims 1 to 4, characterized in that: The step of determining whether the dehydration process is finished according to the difference between the two motor power values ​​in two adjacent dehydration stages includes: If the difference between the two motor power values ​​in two adjacent dehydration stages is greater than the second threshold, the next speed-up dehydration stage is continued; If the difference between the two motor power values ​​in two adjacent dehydration stages is less than or equal to the second threshold, the dehydration program is terminated.

6. The dehydration control method according to claim 1, characterized in that: The method further comprises: After executing the two dehydration stages, if the dehydration program termination requirement is not met, the dehydration stages with the first sub-target speed are executed twice in succession.

7. The dehydration control method according to claim 6, characterized in that: The method further comprises: Get the number of dehydration stages currently running; If the number of dehydration stages is greater than the third threshold, the dehydration process ends; If the number of dehydration stages is less than or equal to the third threshold, the washing machine is controlled to run the dehydration stages with the first sub-target speed twice again.

8. The dehydration control method according to claim 1, characterized in that: The dehydration stage also includes an eccentricity-weighing detection stage running before the speed-up stage; The method further comprises: The target speed of the dehydration stage is determined according to the eccentricity value and the load-bearing value determined in the eccentricity-weighing detection stage.

9. The dehydration control method according to claim 1, characterized in that: The method further comprises: The same acceleration is used to increase the speed in the speed-up phase of controlling multiple dehydration phases.

10. A drum washing machine, characterized in that: The dehydration control method according to any one of claims 1 to 9 is adopted.

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