Control method of a drum washing machine

Abstract

The present application belongs to the technical field of washing equipment, and particularly relates to a control method of a drum washing machine. The present application aims to solve the problem that the inner wall area of the drum of the existing drum washing machine is prone to clamping washing objects before the execution of a drying program, and thus the overall working time and manual intervention work are increased. The control method of the drum washing machine can control the drum to rotate by 180 degrees when the drum is dehydrated and eccentric, and then make the drum swing by a small angle in the positive and negative directions, so as to throw the washing object group out of the clamping position, so that the washing object group can be shaken in an environment without clamping and limiting. Through the self-gravity of the washing object group and the small-angle shaking action of the drum, a significant motion trend of the washing object group is generated based on the principle of inertia, so that the washing object group can be easily thrown from the clamping position to the center area of the drum, so that the washing object group can stretch out in the entire internal space of the drum in a free environment without clamping, and thus the processing program of the drum washing machine is automatically coherent.

Description

Technical Field

[0001] This invention belongs to the field of washing equipment technology, specifically relating to a control method for a drum washing machine. Background Technology

[0002] In a front-loading washing machine, the drum is positioned horizontally inside the casing, such as... Figure 1 As shown, a drum typically comprises three parts: a drum sidewall 1, a drum bottom 2, and a drum front sidewall 3, each located at one end of the drum sidewall 1. A clothes loading opening 4 is formed in the middle of the drum front sidewall 3. Since the drum drive motor, transmission components, and other drum drive accessories need to be installed behind the drum bottom 2, to avoid excessively large longitudinal dimensions of the drum washing machine, most drums are designed with a convex shape facing inwards. This allows for a concave installation space on the outer side of the drum bottom 2, enabling a tight longitudinal installation of the drum drive accessories and the drum, thus optimizing the drum volume without increasing the longitudinal dimensions of the drum washing machine. However, this shape design causes the inclined convex surface on the inner side of the drum bottom 2 and the drum front sidewall 3 to form a trapezoidal cross-section (i.e., ...) near the inner wall of the drum sidewall 1. Figure 1 The drum height of the receiving area (shown as a dashed trapezoidal frame) gradually decreases as it approaches the center radially. Therefore, when the laundry in the drum includes large items such as bedding or multiple small items that are easily tangled, such as thin long-sleeved clothing, the laundry tends to clump together and become stuck in the receiving area. Even if the drum continues to rotate during the washing process, it is difficult to shake off the clumps of laundry stuck in the receiving area. This eccentric jamming situation occurs especially after the spin-drying process in drum washing machines with drying functions. If the laundry is dried in a stuck state, some parts of the laundry cannot be reliably dried, resulting in poor overall drying performance. The laundry can only be freely and evenly distributed in the drum by the user manually pulling out the stuck laundry. This not only causes unnecessary trouble for the user when using a drum washing machine but also increases the overall working time of the washing machine.

[0003] Accordingly, there is a need in the art for a new control method for drum washing machines to solve the above problems. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, specifically the issue that laundry tends to get stuck on the inner wall of the drum before the drying cycle in existing drum washing machines, thus increasing overall processing time and requiring manual intervention, this invention provides a control method for a drum washing machine. The control method includes: after the spin-drying cycle of the drum washing machine has ended, rotating the drum at a set speed and acquiring an eccentricity parameter during drum rotation; detecting whether the drum is eccentric based on the eccentricity parameter; if the drum is eccentric, stopping the drive motor of the drum washing machine; after a first set time, rotating the drum 180°; rotating the drum in both directions at the initial rotation angle for a second set time; acquiring the eccentricity parameter again and detecting whether the drum is eccentric; and selectively executing a drying cycle based on the eccentricity detection result, wherein the initial rotation angle is less than 90°.

[0005] In the preferred embodiment of the above control method, the step of "selectively enabling the drum washing machine to perform a drying program based on the eccentricity detection result of the drum" specifically includes: if the drum is eccentric, then the drum washing machine does not perform the drying program, and the drum washing machine performs an automatic shaking program.

[0006] In the preferred embodiment of the above control method, the step of "making the drum washing machine execute the automatic shaking program" specifically includes: accumulating a fixed angle based on the initial rotation angle; causing the drum to swing forward and backward at the increased rotation angle for the second set time and return to the eccentricity detection step of the drum; in the case of drum eccentricity, accumulating the fixed angle again based on the previously increased rotation angle, and causing the drum to continue swinging forward and backward at the increased rotation angle until the drum is no longer eccentric, wherein the sum of the initial rotation angle and the fixed angle is less than 90°.

[0007] In the preferred embodiment of the above control method, the step of "making the roller swing forward and backward at an increased rotation angle for the second set time" specifically includes: determining whether the increased rotation angle reaches 90°; if the increased rotation angle does not reach 90°, then the roller swings forward and backward at an increased rotation angle for the second set time.

[0008] In a preferred embodiment of the above control method, the control method further includes: if the increased rotation angle reaches 90°, then the drum washing machine is paused and an alarm is issued.

[0009] In the preferred embodiment of the above control method, the drum washing machine includes a sound alarm. The step of "causing the drum washing machine to issue an alarm prompt" specifically includes: causing the sound alarm to continuously emit an alarm sound for a third set time period.

[0010] In a preferred embodiment of the above control method, the control method further includes: detecting the open / closed state of the washing machine door when the audible alarm continues to sound; if the door is detected to have changed from closed to open, then turning off the audible alarm.

[0011] In the preferred embodiment of the above control method, the step of "obtaining the eccentricity parameter of the drum washing machine" specifically includes: obtaining the current change data of the drive motor during the detection period; the step of "detecting whether the drum is eccentric according to the eccentricity parameter" specifically includes: determining the maximum current value and the minimum current value of the drive motor during the detection period based on the current change data; calculating the difference between the maximum current value and the minimum current value; determining whether the difference is greater than a set value; if the difference is greater than the set value, then the drum is eccentric; if the difference is less than or equal to the set value, then the drum is not eccentric.

[0012] In the preferred embodiment of the above control method, the initial rotation angle is 45°; and / or the fixed angle is 10°.

[0013] In the preferred embodiment of the above control method, the step of "selectively enabling the drum washing machine to perform a drying program based on the eccentricity detection result of the drum" includes: if the drum is not eccentric, then enabling the drum washing machine to perform a drying program.

[0014] Those skilled in the art will understand that the control method of the drum washing machine of the present invention can detect drum eccentricity before executing the drying program, control the drum to rotate 180°, and then make the drum swing back and forth at a small angle to shake the laundry clumps out of the jamming position, so that the laundry clumps can be shaken apart in an environment without jamming limit, thereby ensuring that all parts of the laundry can be reliably dried, and making the laundry processing program of the drum washing machine automatic and continuous. Compared to existing methods that directly control the drum's forward and reverse rotation after it becomes eccentric to shake off laundry clumps, the control method of this invention places the laundry clumps on top before shaking them, suspending them below. This causes the direction of the laundry clump's gravity to be opposite to the direction of the force exerted by the drum to hold it in place. Furthermore, since there is no support from the drum's sidewalls below the laundry clumps, there is a large space for movement. This avoids the situation in existing methods where the laundry clumps are shaken to the upper left or upper right along the inner wall of the drum, causing the support force of the inner wall to offset most of the laundry clumps' gravity and weaken their movement tendency. Instead, the laundry clumps generate a significant movement tendency based on inertia through the addition of their own gravity and the small-angle shaking motion of the drum. This allows the laundry clumps to be easily thrown from their holding position to the center area of ​​the drum, enabling them to spread out freely throughout the entire internal space of the drum without being held in place.

[0015] Preferably, the automatic shaking program of the control method of the present invention includes multiple shaking processes with different rotation angles. When the initial rotation angle has not accumulated to 90° and the drum is always eccentric, the drum can gradually enhance the movement trend of the laundry clump by gradually increasing the rotation angle during forward and reverse swings. With the above settings, the rotation angle used by the drum to shake the laundry clump can be minimized, so as to avoid the drum drive motor having to overcome excessive inertia and load during the automatic shaking program, reduce unnecessary wear on the drive motor, and prevent shortening the service life of the drive motor. Attached Figure Description

[0016] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. The drawings are as follows:

[0017] Figure 1 This is a diagram of the drum structure of an existing drum washing machine;

[0018] Figure 2 This is a flowchart of the control method for a drum washing machine according to the present invention;

[0019] Figure 3 This is a detailed flowchart of the preferred embodiment of the control method for a drum washing machine of the present invention. Detailed Implementation

[0020] Those skilled in the art should understand that although the steps of the control method of the present invention are described in a specific order in the description of the present invention, these orders are not restrictive. Those skilled in the art can perform the steps in different orders without departing from the basic principles of the present invention.

[0021] Based on the problem mentioned in the background art that existing drum washing machines easily trap laundry in the inner wall area of ​​the drum before the drying program, thus increasing the overall working time and requiring manual intervention, this invention provides a control method for a drum washing machine. This method aims to solve the problem that existing drum washing machines easily trap laundry in the inner wall area of ​​the drum, thus preventing the continuous execution of the spin-drying and drying programs, or preventing partial drying of the laundry when the spin-drying and drying programs are executed continuously. The control method of this invention utilizes the weight of the laundry clumps combined with the small-angle shaking motion of the drum to induce a significant movement trend in the laundry clumps based on inertia. This allows the laundry clumps to be easily thrown from the trapped position to the center area of ​​the drum and quickly dispersed. This achieves automatic shaking and leveling when the drum is eccentric, reducing user intervention during the operation of the drum washing machine and improving ease of use.

[0022] First refer to Figure 2 , Figure 2 This is a flowchart illustrating the steps of the control method for a drum washing machine according to the present invention. Figure 2 As shown, the control method of the drum washing machine of the present invention includes:

[0023] Step S1: After the spin-drying program of the drum washing machine ends, rotate the drum of the drum washing machine at a set speed and obtain the eccentricity parameters when the drum rotates.

[0024] Step S2: Based on the obtained eccentricity parameters, detect whether the roller is eccentric;

[0025] Step S3: If the drum is eccentric, stop the drive motor of the drum washing machine;

[0026] Step S4: After the first set time, rotate the roller 180°;

[0027] Step S5: Rotate the roller in both directions at the initial rotation angle for a second set time;

[0028] Step S6: Obtain the eccentricity parameters again and check if the roller is eccentric;

[0029] Step S7: Based on the eccentricity detection result of the drum, selectively execute the drying program for the drum washing machine, wherein the initial rotation angle is less than 90°.

[0030] In steps S1-S2, when the drum rotates at a critical speed, it generates a centripetal force sufficient to keep the laundry constantly against the wall. The aforementioned "set speed" is a speed lower than this critical speed. That is, the centripetal force generated when the drum rotates at the set speed cannot keep the laundry constantly against the wall. When the drum rotates at the set speed, if there is no laundry stuck in the inner wall area of ​​the drum, the laundry continuously rotates with the drum to a certain height before falling back to the bottom, and the drive motor load is stable. If the laundry is stuck in the inner wall area of ​​the drum, the laundry constantly rotates with the drum, and the drive motor needs to continuously rotate the laundry clump from a low position to a high position. The drive motor load is unstable, and the drum is severely eccentric. The eccentricity parameters obtained at this set speed can determine whether the drum eccentricity is caused by the laundry being stuck. As an example, the aforementioned set speed is 50 r / min.

[0031] "Eccentricity parameter" refers to any parameter obtained during the rotation of the drum that can determine whether the drum is eccentric, such as the operating parameters of the drive motor when the drum rotates.

[0032] In step S3 above, the specific way to stop the drive motor is to stop supplying power to the drive motor, so that the rotor of the drive motor no longer actively drives the drum to rotate.

[0033] In step S4 above, the duration of the first set time is set to be such that after the drive motor stops for the first set time, the inertial rotation process of the roller is allowed to end and the roller stops naturally.

[0034] In step S5 above, the "initial rotation angle" is the angle at which the roller rotates in the forward or reverse direction during its first forward and reverse swing. When the initial rotation angle is α, during the forward and reverse swing, the roller first rotates clockwise / counterclockwise by α from the positive position (i.e., the position after the roller has rotated 180°) and then returns to the positive position. Then it rotates counterclockwise / clockwise by α and returns to the positive position again. When the roller rotates at the initial rotation angle α, the roller repeats the above forward and reverse swing action within a second set time.

[0035] In the above embodiment, when the drum washing machine rotates at low speed and eccentricity is detected, the drive motor is first stopped from inputting torque to the drum, and then the drum is allowed to stop naturally after a first set time. During the natural stopping process, because the laundry clump is stuck tightly against the inner wall of the drum, the weight of the laundry clump acts concentrated on the local side wall of the drum, causing the drum to stop at the bottom of the inner wall of the drum after stopping its inertial rotation. At this time, controlling the drum to rotate 180° will cause the laundry clump to rotate from the bottom of the inner wall of the drum to the top of the inner wall of the drum. In this position, the bottom of the laundry clump is suspended, and only the upper part of the laundry clump is stuck by the top of the inner wall of the drum, a part of the bottom of the drum near the top of the drum, and a part of the front wall of the drum. In this case, making the drum swing back and forth at an initial rotation angle of less than 90° for a second set time allows the drum to repeatedly swing the laundry clump within the second set time, using the weight of the laundry clump itself to cause it to be thrown out of the stuck position by inertia. After the second set time, the drum is checked again for eccentricity, and the shaking requirement is determined based on the test results. This allows the automatic shaking program to continue even if the laundry clumps haven't been shaken out, thus enabling the washing machine to attempt to resolve the drum eccentricity issue without manual assistance. Setting the initial rotation angle to less than 90° serves two purposes: firstly, it avoids the drum sidewalls supporting the laundry clumps during some rotation phases when the drum rotates at large angles, resulting in insignificant shaking but unnecessary energy consumption; secondly, after the drum rotates the laundry clumps to 90°, it will reverse direction. At this point, the drive motor, which supplies torque to the drum, needs to overcome greater inertial and gravitational forces, generating a larger operating current. Furthermore, there will inevitably be a moment of stillness when reversing from one direction to the other. During this time, the stator and rotor of the drive motor remain stationary, and the drive motor does not perform any external work; all the operating current is used to generate heat. Therefore, repeated large-angle forward and reverse rotations of the drum can easily cause the drive motor to overheat, potentially burning it out or shortening its lifespan. Therefore, the above-described embodiment limits the rotation angle of the drum to more than 90° when it first shakes the laundry clumps, thus reducing unnecessary wear and tear on the drive motor.

[0036] Furthermore, step S7, "selectively executing a drying program in the drum washing machine based on the drum eccentricity detection result," specifically includes:

[0037] If the drum is eccentric, the drum washing machine will not perform the drying program and will instead perform the automatic tumbling program.

[0038] If the drum is not eccentric, the drum washing machine will run the drying program.

[0039] In the above steps, the "automatic shaking program" is a program executed by the drum washing machine in an eccentric situation that does not require manual assistance and can shake the laundry by its own operation (i.e., driving the drum to rotate in a specific way).

[0040] If drum misalignment is detected based on the above detection method after the spin cycle of the drum washing machine ends and before the drying cycle begins, the pre-set operating program will be paused, so that the drum washing machine will not execute the drying cycle and will execute the above steps S3-S7 to correct the drum misalignment. If the drum is detected to be back to a non-misaligned state after executing S7, the drum washing machine will start executing the drying cycle; otherwise, the drum washing machine will execute the automatic shaking program to continue to try to automatically correct the drum misalignment.

[0041] In one specific implementation, the roller eccentricity detection method involved in steps S1 and S2 above is as follows:

[0042] The specific steps for "obtaining the eccentricity parameters of a drum washing machine" include:

[0043] Acquire the current change data of the drive motor during the detection period;

[0044] The steps for "detecting whether the roller is eccentric based on the eccentricity parameters" specifically include:

[0045] Based on the current change data, determine the maximum and minimum current values ​​of the drive motor during the detection period;

[0046] Calculate the difference between the maximum and minimum current values;

[0047] Determine whether the calculated difference is greater than the set value;

[0048] If the difference is greater than the set value, the roller is eccentric;

[0049] If the difference is less than or equal to the set value, the roller is not eccentric.

[0050] In the above steps, the aforementioned detection period refers to the time during which the drive motor detects whether the drum is eccentric while driving the drum. This period can be a specific time when the drive motor drives the drum to swing back and forth to shake off the laundry clumps, or it can be the time during which the drive motor drives the drum to rotate again at a set speed after each swing (i.e., after testing whether the drum is eccentric). The selection of the detection period is only necessary to detect whether the eccentric state of the drum changes during or after the swing. The aforementioned current change data includes the real-time operating current of the drive motor per unit time (e.g., per second, per minute) within the detection period, reflecting the changes in the real-time operating current of the drive motor during the detection period.

[0051] When the laundry is not clumped and stuck to the drum wall, as the drum rotates, the laundry is lifted from the bottom of the drum's inner wall. After reaching a certain height, it falls back down to the lower part of the inner wall under gravity, creating a tumbling washing effect. During this process, the drive motor's load is relatively stable, with stable real-time operating current and minimal fluctuations; the difference between the maximum and minimum operating current values ​​is small. However, when a clump of laundry is stuck near the inner wall of the drum, the clump remains in its stuck position, adhering to the inner wall and moving in a circular motion along the drum's axis. The eccentric load on the drum is larger, causing the drive motor to rotate the drum and the laundry clump with an unstable load, resulting in larger fluctuations in the real-time operating current and a larger difference between the maximum and minimum operating current values. Therefore, when detecting whether the drum is eccentric, the difference between the maximum and minimum current values ​​during the detection period is calculated after collecting the current change data of the drive motor driving the drum. This allows for indirect determination of the drive motor's load status through its operating parameters. By comparing this difference with a manually set reference value (i.e., a set value), it can be determined whether the drive motor's load fluctuation meets expectations, thus determining whether the drum is stuck against the wall and misaligned with the laundry. The set value is a critical current difference value set based on the working performance of the drum washing machine. When the difference between the maximum and minimum current values ​​equals this set value, the drum is in a non-eccentric state. If the difference exceeds this set value, the drum is eccentric. In actual eccentricity detection, to accommodate detection errors in the current data or differences in the mass of the laundry in each jamming situation, a tolerance threshold can be set on top of the set value. As long as the difference between the maximum and minimum current values ​​does not exceed the sum of the set value and the positive and negative tolerance thresholds, the drum is considered not eccentric. Of course, the specific types and comparison forms of the above-mentioned eccentricity parameters are not limited. For example, the real-time power data of the drive motor can also be used to determine whether the drum is eccentric. In addition to the difference form, the comparison can also be based on the ratio of the maximum current value to the minimum current value or the data of the maximum current value and the minimum current value. The specific setting form and value of the set value can be adjusted according to the actual type and actual comparison form of the selected eccentricity parameter.

[0052] In a preferred embodiment, the step of "causing the drum washing machine to perform an automatic shaking program" specifically includes:

[0053] Accumulate a fixed angle based on the initial rotation angle;

[0054] The roller is made to swing forward and backward at an increased rotation angle for a second set time and then return to the eccentricity detection step of the roller.

[0055] In the case of roller eccentricity, a fixed angle is added again on the basis of the previously increased rotation angle, and the roller continues to swing forward and backward with an increased rotation angle until the roller is no longer eccentric. The sum of the initial rotation angle and the fixed angle is less than 90°.

[0056] In the above steps, if the drum washing machine still detects drum eccentricity after swinging back and forth at the initial rotation angle and needs to execute the automatic shaking program, the rotation angle is gradually increased by a fixed increment based on the initial rotation angle. This prolongs the rotation trajectory of the laundry clumps each time they swing with the drum. Combined with the gravity of the laundry clumps and the inertial retention of the laundry clumps when the drum swings back, this increases the probability of the laundry clumps shifting away from their stuck position, reducing the tightness of the laundry clumps. During the automatic shaking program, when the drum does not change its eccentric state, the drum washing machine repeats the swing several times with gradually increasing rotation angles (the first swing angle is the sum of the initial rotation angle and a fixed angle, the second swing angle is the sum of the initial angle and two fixed angles, and so on, accumulating sequentially). Each swing takes the same amount of time as the second set time. After each swing, a drum eccentricity detection step is executed. If the detection result shows that the drum is not eccentric, the laundry clumps are successfully shaken apart, and the automatic shaking program ends. The initial rotation angle is preferably 45°, and the fixed angle is preferably 10°.

[0057] Furthermore, the aforementioned step of "making the roller swing forward and backward at an increased rotation angle for a second set time" specifically includes:

[0058] Determine whether the increased rotation angle reaches 90°;

[0059] If the increased rotation angle does not reach 90°, then the roller will swing forward and backward at the increased rotation angle for a second set time.

[0060] If the increased rotation angle reaches 90°, the drum washing machine will pause its program and issue an alarm.

[0061] In the above implementation, 90° is used as the cumulative limit of the rotation angle. As the rotation angle gradually increases and the drum repeatedly swings forward and backward, as long as the accumulated angle does not reach 90°, the rotation angle can continue to increase even if the drum's eccentricity is not improved. Once the rotation angle reaches 90°, the automatic shaking program will end even if the drum is not automatically leveled. This is to alert the user to manually adjust the position of the laundry inside the drum when the laundry is severely stuck and difficult to shake automatically, thus balancing the loss during automatic shaking and the automation effect of the drum washing machine. This improves the automation performance of the drum washing machine while avoiding excessive loss during non-washing operations. For example, in the automatic shaking program, if the initial rotation angle is 45° and the fixed angle is 10°, then before the drum is leveled, the rotation angles of each forward and backward swing are 55°, 65°, 75°, and 85° respectively. If the eccentricity is not improved after four forward and backward swings, the automatic shaking program ends. In practical applications, those skilled in the art can set the initial rotation angle and fixed angle according to the specific wear and tear tolerance of the drum washing machine and the automatic shaking requirements. Those skilled in the art can also adjust the limit value of the maximum rotation angle, such as adjusting it from 90° to 80°.

[0062] Furthermore, the drum washing machine of the present invention includes a sound alarm, and the step of "causing the drum washing machine to issue an alarm" specifically includes:

[0063] The sound alarm will continue to emit an alarm sound for a third set time period.

[0064] In the above steps, the audible alarm is a device that can emit a specific sound to sound an alarm, such as a buzzer. When the automatic shaking program of the drum washing machine ends but the drum is not leveled, the audible alarm will alert the user to check the current status of the drum washing machine so that the drum can be leveled manually as soon as possible to continue the set program and prevent the entire washing process from being paused or not completed due to drum misalignment.

[0065] Furthermore, the control method of the present invention further includes:

[0066] If the audible alarm continues to sound, check the open / closed status of the washing machine door;

[0067] If the door is detected to be opening from closed, the audible alarm will be turned off.

[0068] During the above steps, the door is closed while the drum washing machine is running its operating program or automatic tumbling program. If the door opens after the alarm is triggered, it indicates that the user has opened the door to check the condition of the laundry, signifying that the task has been completed, and therefore the audible alarm is turned off at this point.

[0069] Of course, besides reaching the third preset time or the user opening the machine door, the audible alarm can also be deactivated based on a user-issued shutdown command. For example, while the audible alarm is sounding and the user is approaching the washing machine, the alarm can be deactivated by pressing the alarm deactivation button or using a voice command. Those skilled in the art can configure the specific type of alarm device and the method of deactivating the alarm according to actual alarm requirements.

[0070] See also Figure 3 , Figure 3 This is a detailed flowchart of a preferred embodiment of the control method for a drum washing machine according to the present invention. Figure 3 As shown, a preferred embodiment of the present invention includes the following steps:

[0071] Step S100: When the spin-drying program of the drum washing machine ends, rotate the drum at a set speed for a set time and acquire the current change data of the drive motor during this period;

[0072] Step S101: Determine whether the difference between the maximum current value and the minimum current value is greater than the set value;

[0073] If the difference between the maximum current value and the minimum current value is greater than the set value, then proceed to step S102; otherwise, proceed to step S1011.

[0074] Step S102: Stop the drive motor;

[0075] Step S103: After the first set time, rotate the drum 180°;

[0076] Step S104: Rotate the roller in both directions at the initial rotation angle for a second set time;

[0077] Step S105: Rotate the drum again at the set speed for the set time and acquire the current change data of the drive motor during this period;

[0078] Step S106: Determine again whether the difference between the maximum current value and the minimum current value is greater than the set value;

[0079] If the difference between the maximum current value and the minimum current value is greater than the set value, then proceed to step S107; otherwise, proceed to step S1011.

[0080] Step S107: Accumulate a fixed angle based on the initial rotation angle;

[0081] Step S108: Determine whether the increased rotation angle reaches 90°;

[0082] If the increased rotation angle does not reach 90°, proceed to step S109; otherwise, proceed to step S1010.

[0083] Step S109: Rotate the roller in both directions at an increased rotation angle for a second set time;

[0084] Step S1010: Pause the program of the drum washing machine and issue an alarm prompt;

[0085] Step S1011: Run the drying program in the drum washing machine.

[0086] Regarding the above implementation methods, it should be noted that the specific durations of the first set time, the second set time, and the second set time can be set according to actual design requirements, as long as the set durations can meet the corresponding requirements for natural drum stop, single swing and shaking, and alarm prompts.

[0087] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method for a drum washing machine, characterized in that, The control method includes: When the spin-drying program of the drum washing machine ends, the drum of the drum washing machine is rotated at a set speed and the eccentricity parameter of the drum during rotation is obtained; Based on the eccentricity parameters, detect whether the roller is eccentric; If the drum is eccentric, the drive motor of the drum washing machine will stop. After a first set time, the roller is rotated 180°; The roller is made to swing forward and backward at the initial rotation angle for a second set time; The eccentricity parameter is obtained again and the roller is checked for eccentricity. Based on the eccentricity detection result of the drum, the drum washing machine is selectively configured to perform a drying program, wherein... The initial rotation angle is less than 90°; The step of "selectively executing a drying program in the drum washing machine based on the eccentricity detection result of the drum" specifically includes: If the drum is eccentric, the drum washing machine will not perform the drying program and will instead perform the automatic tumbling program. The steps of "making the drum washing machine perform an automatic shaking program" specifically include: A fixed angle is added to the initial rotation angle; The roller is made to swing forward and backward at an increased rotation angle for the second set time and then return to the eccentricity detection step of the roller; In the case of roller eccentricity, the fixed angle is added again based on the previously increased rotation angle, and the roller continues to swing forward and backward with an increased rotation angle until the roller is no longer eccentric. The sum of the initial rotation angle and the fixed angle is less than 90°.

2. The control method according to claim 1, characterized in that, The step of "making the roller swing forward and backward at an increased rotation angle for the second set time" specifically includes: Determine whether the increased rotation angle reaches 90°; If the increased rotation angle does not reach 90°, then the roller will be made to swing forward and backward at the increased rotation angle for the second set time.

3. The control method according to claim 2, characterized in that, The control method further includes: If the increased rotation angle reaches 90°, the drum washing machine will pause its program and issue an alarm.

4. The control method according to claim 3, characterized in that, The drum washing machine includes an audible alarm. The step of "causing the drum washing machine to issue an alarm" specifically includes: The sound alarm will continuously emit an alarm sound for a third set time period.

5. The control method according to claim 4, characterized in that, The control method further includes: If the audible alarm continues to sound, the open / closed status of the washing machine door is detected. If the door is detected to open from closed, the audible alarm is turned off.

6. The control method according to claim 1, characterized in that, The steps of "obtaining the eccentricity parameters of the drum washing machine" specifically include: Obtain the current change data of the drive motor during the detection period; The step of "detecting whether the roller is eccentric based on the eccentricity parameter" specifically includes: Based on the current change data, determine the maximum and minimum current values ​​of the drive motor during the detection period; Calculate the difference between the maximum current value and the minimum current value; Determine whether the difference is greater than a set value; If the difference is greater than the set value, then the roller is eccentric; If the difference is less than or equal to the set value, then the roller is not eccentric.

7. The control method according to claim 1, characterized in that, The initial rotation angle is 45°; and / or The fixed angle is 10°.

8. The control method according to claim 1, characterized in that, The step of "selectively executing a drying program in the drum washing machine based on the eccentricity detection result of the drum" includes: If the drum is not eccentric, the drum washing machine will perform a drying program.

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