CN113005714A - Dehydration control method and medium for drum washing machine and drum washing machine - Google Patents
Dehydration control method and medium for drum washing machine and drum washing machine Download PDFInfo
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- CN113005714A CN113005714A CN202110209396.0A CN202110209396A CN113005714A CN 113005714 A CN113005714 A CN 113005714A CN 202110209396 A CN202110209396 A CN 202110209396A CN 113005714 A CN113005714 A CN 113005714A
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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
- D06F33/40—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of centrifugal separation of water from the laundry
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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
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/04—Signal transfer or data transmission arrangements
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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
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/02—Characteristics of laundry or load
- D06F2103/04—Quantity, e.g. weight or variation of weight
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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
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/24—Spin speed; Drum movements
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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
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
- D06F2105/48—Drum speed
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Abstract
The application provides a dehydration control method and medium of a drum washing machine and the drum washing machine. The method comprises a pre-dehydration stage and a final dehydration stage; the pre-dewatering stage comprises: determining a first load weight of a load and a first weight gear range to which the first load weight belongs; detecting the rotation speed fluctuation of the motor to obtain a first rotation speed fluctuation value; if the first rotating speed fluctuation value is below the rotating speed fluctuation limit value corresponding to the first weight gear interval, executing a pre-dehydration step; the final dewatering stage comprises: determining a second load weight of the load and a second weight gear interval to which the second load weight belongs; detecting the rotation speed fluctuation of the motor to obtain a second rotation speed fluctuation value, and determining a target rotation speed gear according to the second rotation speed fluctuation value and a second weight gear interval; a final dehydration step is performed. The method improves the dehydration success rate of the light-weight load, reduces time delay, reduces the probability of colliding with the box body to shift during dehydration of the heavy-weight load, and balances vibration and noise levels.
Description
Technical Field
The application relates to the technical field of drum washing machines, in particular to a dehydration control method and medium for a drum washing machine and the drum washing machine.
Background
At present, the motors used in many drum washing machines are series motors. In the dehydration stage of the drum washing machine, the dehydration logic is generally adopted as follows: and judging whether the speed fluctuation is within a preset speed fluctuation limit value or not, and when the speed fluctuation is within the preset speed fluctuation limit value, dehydrating by adopting a preset dehydration rotating speed. If the mode is adopted for dehydration, one condition can cause the inner drum of the washing machine to impact the box body, generate larger vibration noise and even cause the washing machine to shift, and have potential safety hazards; in another case, the washing machine may not enter the preset dehydration rotation speed for dehydration in a delayed manner, and there is a delay, even the washing machine does not dehydrate.
Disclosure of Invention
In order to solve the above technical problems in the field of drum washing machines, an object of the present application is to provide a dehydration control method of a drum washing machine, a medium and a drum washing machine.
According to an aspect of the present application, there is provided a dehydration control method of a drum washing machine, including a pre-dehydration stage and a final dehydration stage, wherein:
the pre-dewatering stage comprises:
determining a first load weight of a load, and determining a first weight gear interval to which the first load weight belongs;
detecting the rotation speed fluctuation of the motor to obtain a first rotation speed fluctuation value;
if the first rotation speed fluctuation value is below a rotation speed fluctuation limit value corresponding to the first weight gear interval, executing a pre-dehydration step, wherein the rotation speed fluctuation limit value corresponding to the weight gear interval of the low gear is larger than the rotation speed fluctuation limit value corresponding to the weight gear interval of the high gear, and the pre-dehydration step comprises the following steps: controlling the motor to run at a pre-dehydration rotating speed so as to carry out pre-dehydration;
the final dewatering stage comprises:
determining a second load weight of the load, and determining a second weight gear interval to which the second load weight belongs;
detecting the rotation speed fluctuation of the motor to obtain a second rotation speed fluctuation value, and determining a target rotation speed gear according to the second rotation speed fluctuation value and the second weight gear interval, wherein the second rotation speed fluctuation value is positioned below a rotation speed fluctuation limit value corresponding to the target rotation speed gear in rotation speed fluctuation limit values corresponding to the second weight gear interval, one rotation speed fluctuation limit value simultaneously corresponds to one rotation speed gear and one second weight gear interval, each rotation speed gear corresponds to a final dehydration rotation speed, and the final dehydration rotation speed is greater than the pre-dehydration rotation speed;
performing a final dewatering step, the final dewatering step comprising: and controlling the motor to operate according to the final dehydration rotating speed corresponding to the target gear so as to perform final dehydration.
According to another aspect of the present application, there is provided a computer readable storage medium storing computer program instructions which, when executed by a computer, cause the computer to perform the method as previously described.
According to another aspect of the present application, there is provided a drum washing machine including:
a processor;
a memory having computer readable instructions stored thereon which, when executed by the processor, implement the method as previously described.
According to the technical scheme, the embodiment of the application has at least the following advantages and positive effects:
the applicant has found that the magnitude of the rotational speed fluctuation of the drum washing machine is linear with the load eccentricity under a constant load of the drum washing machine, whereas the rotational speed fluctuation of a heavy load is significantly smaller under the same load eccentricity for loads of different weights. Under the method, the weight of the load is respectively determined in the pre-dehydration stage and the final dehydration stage, the rotation speed fluctuation detection is carried out, the corresponding rotation speed fluctuation limit values are set according to the load in different weight gear intervals in a distinguishing way, and the dehydration is carried out according to whether the measured rotation speed fluctuation value is below the rotation speed fluctuation limit value corresponding to the corresponding weight gear interval, so that the loads with different weights can be dehydrated according to the different rotation speed fluctuation limit values in a targeted way, the dehydration success rate of the small-weight load is improved, the time delay is reduced, the probability of the box body collision displacement during the dehydration of the large-weight load is reduced, the vibration and noise level is balanced, and the intelligent judgment capability of the drum washing machine is improved on the whole.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a flowchart illustrating a dehydration control method of a drum washing machine according to an exemplary embodiment;
FIG. 2 is a flowchart illustrating details of step 120 according to one embodiment illustrated in a corresponding embodiment of FIG. 1;
fig. 3 is a block diagram illustrating a drum washing machine according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Furthermore, the drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.
The application firstly provides a dehydration control method of a drum washing machine. The drum washing machine may include a control unit, a suspension system including an inner tub for loading clothes as a load, and a motor driving the inner tub to rotate to dehydrate the clothes, the control unit being electrically connected with the motor, the control unit controlling the operation of the motor to control the dehydration of the drum washing machine.
Vibration and noise are easy to occur when the drum washing machine is used for dewatering, the control of the vibration and the noise is one of important subjects in the development field of the drum washing machine, and the vibration and the noise are directly related to the load eccentricity of the drum washing machine. If a variable frequency motor is adopted, the load eccentricity can be determined by detecting parameters such as current and the like, and then the vibration and the noise of the drum washing machine during dehydration are controlled; however, if a common constant-frequency series motor is adopted, the detection function is limited, parameters such as current and the like cannot be detected, the load eccentricity cannot be accurately determined, and further vibration and noise cannot be controlled.
The applicant of the application finds that the rotation speed fluctuation of the drum washing machine is in a linear relation with the load eccentricity, the load eccentricity can be correspondingly detected by detecting the rotation speed fluctuation, the load eccentricity is controlled by setting a rotation speed fluctuation limit value, and the aim of controlling vibration and noise can be fulfilled. However, the applicant has also found that a linear relationship between the magnitude of the rotation speed fluctuation and the eccentricity of the load is established when the load of the drum washing machine is constant, and the rotation speed fluctuation of the load with a large weight is significantly smaller for loads with different weights and the same eccentricity of the load. This is because the increase in load weight results in an increase in the overall suspension weight and an increase in resistance to velocity fluctuations. Due to the inherent characteristics of the mechanical structure of the drum washing machine, when the drum washing machine reaches a certain rotating speed interval, the drum washing machine generates resonance phenomenon, and the generated vibration is the largest. If the maximum eccentric amount allowed to pass through the resonance area is defined as eccentric capability, so that the characteristic that the fluctuation of the rotating speed of the heavy load is obviously smaller when the eccentric amount of the load is the same improves the eccentric capability of the resonance area of the heavy load, the eccentric capability of the resonance area of the empty barrel is 1kg in general, the eccentric capability of the resonance area of the empty barrel can be increased to be more than 1.8kg for the heavy load, and the speed fluctuation value of the empty barrel under the load eccentric amount of 1kg is larger than that of the load eccentric amount of 1.8 kg. Therefore, if the dehydration is carried out by simply depending on the comparison between the fluctuation size of the rotating speed and the fluctuation limit value of the rotating speed, if the maximum speed fluctuation value which can be born when the barrel is empty is set as the limit value, when the dehydration is carried out on the load with large weight, the corresponding speed fluctuation value can reach the limit value only when the large load eccentricity is generated, and thus the displacement of the collision box body can be caused; if the maximum speed fluctuation value that can be borne by a heavy load is set as a limit value, when dewatering a load with a small weight, if a small load eccentricity is generated, the corresponding speed fluctuation value will reach the limit value, so that the problems of time delay and dehydration will occur, and the capacity of the whole machine cannot be exerted.
Therefore, the load eccentricity can be indirectly measured by separately detecting the magnitude of the rotation speed fluctuation and the load weight. The dehydration control method of the drum washing machine can set corresponding rotation speed fluctuation limit values for loads in different weight gear intervals in a differentiated mode by determining the weight of the load and detecting rotation speed fluctuation, and for the loads with certain weight, dehydration is performed according to the rotation speed fluctuation limit values corresponding to the weight gear intervals to which the load belongs, so that the dehydration success rate of small-weight loads is improved, time delay is reduced, the probability of collision against the box body to shift during dehydration of large-weight loads is reduced, vibration and noise levels are balanced, and the intelligent judgment capability of the drum washing machine is improved on the whole.
Fig. 1 is a flowchart illustrating a dehydration control method of a drum washing machine according to an exemplary embodiment. The dehydration control method of the present embodiment may be performed by a control unit of a drum washing machine, including a pre-dehydration stage and a final dehydration stage, as shown in fig. 1, and specifically includes the following steps.
The pre-dehydration stage comprises steps 110-130, specifically:
The load is clothes in the inner barrel of the drum washing machine, a plurality of weight gear intervals are divided in advance according to the weight distribution condition of the clothes which can be loaded by the drum washing machine, all the weight gear intervals are distributed continuously and can cover all possible load weights, of course, all the weight gear intervals can also be distributed at intervals, and the same specific load weight only belongs to one weight gear interval. For example, each weight gear range may correspond to a large load, a medium load, and a small load, respectively.
In one embodiment, prior to determining a first load weight of the load and determining a first weight gear range to which the first load weight belongs, the method further comprises:
detecting the rotation speed fluctuation of the motor to obtain a third rotation speed fluctuation value;
and judging whether the third rotating speed fluctuation value is below a first preset rotating speed fluctuation limit value or not, wherein a first load weight of a load is determined, and a first weight gear interval to which the first load weight belongs is determined under the condition that the third rotating speed fluctuation value is below the first preset rotating speed fluctuation limit value.
The motor adopts a common fixed-frequency series-excited motor.
And when the third rotating speed fluctuation value is not below the first preset rotating speed fluctuation limit value, the rotating speed fluctuation detection is carried out on the motor again until the third rotating speed fluctuation value is below the first preset rotating speed fluctuation limit value.
Before the rotation speed fluctuation detection is carried out on the motor to obtain a third rotation speed fluctuation value, a drainage and load uniform distribution link of the drum washing machine is firstly carried out. The eccentricity can be reduced by evenly distributing the load. And after the drainage and the uniform distribution are finished, controlling the motor to run at the rotating speed of 93rpm, carrying out rotating speed fluctuation detection, and when the third rotating speed fluctuation value is not below the first preset rotating speed fluctuation limit value, controlling the motor to reduce the speed to 0 and increase the speed to 93rpm again, and carrying out rotating speed fluctuation detection. The detailed manner of the rotation speed fluctuation detection will be described in the following embodiments, and will not be described in detail here.
The first preset rotation speed fluctuation limit value is used for judging whether the operation of the drum washing machine is safe, and when the third rotation speed fluctuation value is below the first preset rotation speed fluctuation limit value, the safety is confirmed. The first preset rotation speed fluctuation limit value is empirically set.
In one embodiment, the step of determining a first load weight of the load comprises:
recording the time consumed by the free speed reduction of the motor in a preset speed reduction interval;
a first load weight of the load is determined based on the time.
After the motor finishes the rotation speed fluctuation detection at the rotation speed of 93rpm, the motor rapidly increases the speed to 150rpm and freely decreases the speed to 93rpm, the time t1 consumed in the speed reduction in the rotation speed interval of 145-105 rpm is recorded, and the first load weight can be determined according to the time t 1. Specifically, the time consumed by the loads of different weights in the preset rotation speed reduction interval may be experimentally determined in advance, and a relational curve may be drawn or a relational model may be established, so that the first load weight may be determined according to the time t 1.
At this time, the preset speed reduction interval is 145rpm to 105rpm, and when the method is actually applied, other speed reduction intervals can be adopted.
In one embodiment, the recording the time consumed by the motor to freely slow down within the preset speed reduction interval comprises:
recording the time consumed by the free speed reduction of the motor in a preset speed reduction interval for multiple times;
said determining a first load weight of the load as a function of said time comprises:
an average value of the recorded times is determined and a first load weight of the load is determined from the average value.
When recording the time consumed by two free decelerations, after the first deceleration reaches 93rpm, the stable speed is unchanged within 5-10 seconds, then the speed is rapidly increased to 150rpm and is freely decelerated to 93rpm, recording the time t2 consumed by the deceleration in the rotating speed interval of 145rpm-105rpm, determining the average value t3 of t1 and t2, and determining the first load weight of the load according to t 3.
In practice, the maximum and minimum values of the rotation speed for each deceleration or acceleration may be different in order to record the time spent by the deceleration. In order to save time, after the first deceleration, the speed can be directly increased without keeping the speed stable.
In the embodiment, the load weight is determined according to the average value of each deceleration time by recording the deceleration time for many times, so that the influences of contingency and errors are reduced, and the accuracy of the calculated load weight is improved.
In one embodiment, before determining an average of the recorded times and determining the first load weight of the load from the average, the method further comprises:
the maximum and minimum values recorded at each time are removed.
By removing the maximum and minimum values, contingencies are further reduced and accuracy of the calculated load weight is improved.
And 120, detecting the rotation speed fluctuation of the motor to obtain a first rotation speed fluctuation value.
Fig. 2 is a flowchart illustrating details of step 120 according to an embodiment illustrated in a corresponding embodiment of fig. 1, and as shown in fig. 2, includes the following steps:
and step 121, controlling the motor to run at a first rotating speed.
The first speed is 93rpm, it is readily understood that other speeds may be used in practice.
And step 122, acquiring the actual rotating speed of the motor during the operation at the first rotating speed, and determining a first rotating speed fluctuation value according to the actual rotating speed.
In one embodiment, the obtaining an actual rotation speed of the motor during operation at the first rotation speed, and the determining the first rotation speed fluctuation value based on the actual rotation speed includes:
the maximum value and the minimum value of the actual rotating speed of the motor during the operation at the first rotating speed are respectively obtained, and the difference between the maximum value and the minimum value is determined as a first rotating speed fluctuation value.
In one embodiment, the obtaining an actual rotation speed of the motor during operation at the first rotation speed, and the determining the first rotation speed fluctuation value based on the actual rotation speed includes:
an actual rotational speed of the motor during operation at a first rotational speed, which deviates most from the first rotational speed, is acquired, and an absolute value of a difference between the actual rotational speed and the first rotational speed is determined as a first rotational speed fluctuation value.
In one embodiment, the obtaining an actual rotation speed of the motor during operation at the first rotation speed, and the determining the first rotation speed fluctuation value based on the actual rotation speed includes:
aiming at each time period in a plurality of time periods in the period that the motor runs at the first rotating speed, acquiring the maximum value and the minimum value of the actual rotating speed of the motor in the time period, and determining the difference between the maximum value and the minimum value as the rotating speed fluctuation value corresponding to the time period;
and determining a first rotation speed fluctuation value according to the rotation speed fluctuation value corresponding to each time period.
In one embodiment, the determining the first rotation speed fluctuation value according to the rotation speed fluctuation value corresponding to each time period includes:
and determining the average value of the rotating speed fluctuation values corresponding to each time period as a first rotating speed fluctuation value.
In one embodiment, the determining the first rotation speed fluctuation value according to the rotation speed fluctuation value corresponding to each time period includes:
and removing the maximum value and the minimum value from the rotating speed fluctuation values corresponding to each time period, and determining the average value of the remaining rotating speed fluctuation values as a first rotating speed fluctuation value.
In the embodiment, the maximum value and the minimum value of each rotating speed fluctuation value are removed, and then the average value is obtained, so that the influence of accidental factors is avoided, and the accuracy of measuring the first rotating speed fluctuation value is improved.
And step 130, if the first rotation speed fluctuation value is below the rotation speed fluctuation limit value corresponding to the first weight gear interval, executing a pre-dehydration step.
Wherein, the rotational speed fluctuation limit value that the weight gear interval of low gear corresponds to is greater than the rotational speed fluctuation limit value that the weight gear interval of high gear corresponds to, the dehydration step in advance includes: and controlling the motor to run at the pre-dehydration rotating speed so as to perform pre-dehydration.
That is, the lower the shift position of the weight shift position section, the greater the corresponding rotation speed fluctuation limit value.
As already mentioned, for loads of different weights, the rotational speed fluctuations of the heavy loads are significantly smaller for the same load eccentricity. Therefore, by setting a larger rotation speed fluctuation limit value for the weight gear interval of the low gear, the rotation speed fluctuation limit value corresponding to the small weight load is larger, the rotation speed fluctuation limit value corresponding to the large weight load is smaller, the load eccentricity can be controlled to be maintained at a reasonable level, the dehydration success rate of the small weight load is improved, the time delay is reduced, the probability of displacement of the box body during dehydration of the large weight load is reduced, and the vibration and noise level during dehydration of the drum washing machine can be better controlled.
Since in many cases the load eccentricity increases as the rotational speed increases and the water flows out of the load, this leads to increased vibration and noise, while a pre-spinning rotational speed that is too high further increases vibration and noise. Therefore, the pre-dehydration rotation speed can be set to 400rpm or 500rpm, and vibration and noise can be controlled at a reasonable level.
Due to the limitation of mechanical structure, the internal structure of the drum washing machine is provided with a resonance area, the resonance area is mostly between 200 and 300rpm, and the motor can generate large vibration and noise when running in the resonance area, so that the motor can be controlled to accelerate through the resonance area before pre-dehydration is carried out, and then reach the pre-dehydration rotating speed, thereby reducing the vibration and noise to the maximum extent.
The pre-dehydration rotating speed is a rotating speed stage, the rotating speed stage can only comprise a constant rotating speed interval, correspondingly, the pre-dehydration rotating speed can be a constant rotating speed, and the rotating speed is increased or decreased when approaching or leaving the rotating speed stage; the rotation speed phase can also be an unsteady rotation speed interval, the unsteady rotation speed interval can comprise a plurality of different constant rotation speed sub-intervals, a variable rotation speed sub-interval exists between every two constant rotation speed sub-intervals, the rotation speed in the variable rotation speed sub-interval can have the change of acceleration and deceleration, and the unsteady rotation speed interval can only comprise the change of acceleration and deceleration.
Through the pre-dehydration stage, most of water is primarily dehydrated, the phenomenon of water-carrying dehydration which does not occur in time when the water is drained under the condition of higher water content of a large load is prevented, and the high-power consumption during final high-speed dehydration is avoided.
The final dehydration stage includes steps 140-160, specifically:
When the pre-dehydration step is finished, the rotating speed of the motor is freely reduced to 93rpm from the pre-dehydration rotating speed, the time t3 consumed by reducing the rotating speed in the rotating speed interval of 350rpm-150rpm is recorded, and the second load weight can be determined according to the time t 3. The relationship of time t3 to the second load weight can be determined by experimental data.
In some embodiments of the present application, the time consumed by the motor to freely decelerate in the same speed-decelerating interval is measured multiple times, and the second load weight of the load is determined according to the average value of the times.
This may improve the accuracy of the second load weight measurement. Of course, in order to improve the efficiency of measuring the load weight, the time taken for the free deceleration may be measured only once.
And 150, detecting the rotation speed fluctuation of the motor to obtain a second rotation speed fluctuation value, and determining a target rotation speed gear according to the second rotation speed fluctuation value and the second weight gear interval.
The second rotating speed fluctuation value is below a rotating speed fluctuation limit value corresponding to the target rotating speed gear in rotating speed fluctuation limit values corresponding to the second weight gear intervals, one rotating speed fluctuation limit value simultaneously corresponds to one rotating speed gear and one second weight gear interval, each rotating speed gear corresponds to a final dewatering rotating speed, and the final dewatering rotating speed is greater than the pre-dewatering rotating speed.
And controlling the motor to operate at 93rpm to perform rotation speed fluctuation detection, wherein the specific adopted mode can be the same as the rotation speed fluctuation detection adopted for obtaining the first rotation speed fluctuation value.
The rotation speed used for detecting the rotation speed fluctuation to obtain the first rotation speed fluctuation value may be the same as or different from the rotation speed used for detecting the rotation speed fluctuation to obtain the second rotation speed fluctuation value, and specifically, the step of detecting the rotation speed fluctuation of the motor to obtain the second rotation speed fluctuation value may include: controlling the motor to operate at a second rotating speed; and acquiring the actual rotating speed of the motor during the operation at the second rotating speed, and determining a second rotating speed fluctuation value according to the actual rotating speed.
The rotating speed of the motor is controlled to operate usually between 90rpm and 110rpm when the rotating speed fluctuation is detected, at the moment, the load can be attached to the wall tightly, the stability of the test can be ensured, and meanwhile, the generated vibration and noise are controllable, so that the user experience is ensured, and the stability of the product can also be ensured.
The second weight gear step section and the aforementioned first weight gear step section may be divided by the same weight gear step division method, or may be divided by different weight gear step division methods, and the following description will be given by taking an example in which both are divided by the same weight gear step division method.
TABLE 1
Referring to table 1, the second weight shift range corresponds to one of a large load, a medium load, and a small load, the weight of the weight shift range corresponding to the large load is the largest, the weight of the weight shift range corresponding to the medium load is the next to the weight of the weight shift range corresponding to the medium load, the weight of the weight shift range corresponding to the small load is the smallest, that is, the shift of the weight shift range corresponding to the large load is the highest, and the shift of the weight shift range corresponding to the small load is the lowest. The corresponding relation between different loads and the rotating speed fluctuation limit value, the corresponding relation between the rotating speed gear and the rotating speed fluctuation limit value and the corresponding relation between the rotating speed gear and the rotating speed can be obtained by looking up a table. The rotation speed gears are respectively high speed, downshift 1, downshift 2 and downshift 3, the final dehydration rotation speeds corresponding to the rotation speed gears are respectively 1400rpm, 1200rpm, 1000rpm and 800rpm, and the higher the rotation speed gear is, the higher the corresponding final dehydration rotation speed is. As can be seen from table 1, the rotation speed fluctuation limit values corresponding to different weight gear intervals are different, the rotation speed fluctuation limit values corresponding to different rotation speed gears are also different, and the corresponding rotation speed fluctuation limit values can be uniquely determined according to one weight gear interval and one rotation speed gear. When the second weight gear interval and the first weight gear interval are divided in the same weight gear division mode, a row can be added on the rightmost side of the table 1, the pre-dehydration rotating speed is used as a rotating speed gear, and the rotating speed fluctuation limit values corresponding to the pre-dehydration rotating speed and different weight gear intervals are recorded, so that the recording of the parameters is simpler and more convenient, and the rotating speed fluctuation limit value corresponding to the pre-dehydration rotating speed and the rotating speed fluctuation limit value corresponding to the final dehydration rotating speed can be stored in a separate table.
For each rotating speed fluctuation limit value corresponding to the same rotating speed gear, the rotating speed fluctuation limit value corresponding to the weight gear interval of the low gear is larger than the rotating speed fluctuation limit value corresponding to the weight gear interval of the high gear. Because the faster the rotating speed, the more vibration and noise may be generated, for each rotating speed fluctuation limit value corresponding to the same weight gear interval, the rotating speed fluctuation limit value corresponding to the low rotating speed gear is greater than the rotating speed fluctuation limit value corresponding to the high rotating speed gear, so that the vibration and noise can be prevented from being too large when the motor is operated at the high speed gear of 1400 rpm.
For example, in table 1, among the rotation speed fluctuation limits corresponding to the high-speed gears, for the rotation speed fluctuation limits a1-1, a2-1, and A3-1 corresponding to different weight gear intervals, the relationship among them is A3-1 > a2-1 > a 1-1; and in the rotating speed fluctuation limits corresponding to the heavy load, for the rotating speed fluctuation limits A1-1, A1-2, A1-3 and A1-4 corresponding to different rotating speed gears, the relation of the four is A1-1 < A1-2 < A1-3 < A1-4.
Although in table 1, the same speed gear corresponds to one final spin-drying speed, in other embodiments, the same speed gear may correspond to a plurality of different final spin-drying speeds. Each final dewatering speed can be randomly selected, or can be selected according to different weight gear intervals.
In one embodiment, the step of detecting the rotation speed fluctuation of the motor to obtain a second rotation speed fluctuation value, and determining the target rotation speed gear according to the second rotation speed fluctuation value and the second weight gear interval includes:
performing a step of determining a second speed fluctuation value, the step of determining a second speed fluctuation value comprising: detecting the rotation speed fluctuation of the motor to obtain a second rotation speed fluctuation value;
determining a rotation speed fluctuation limit value corresponding to the second weight gear interval;
judging whether the determined rotation speed fluctuation limit values have rotation speed fluctuation limit values above the second rotation speed fluctuation value, if so, taking the rotation speed fluctuation limit values above the second rotation speed fluctuation value as candidate rotation speed fluctuation limit values, otherwise, executing the step of determining the second rotation speed fluctuation value;
and determining the highest rotation speed gear from the rotation speed gears corresponding to the candidate rotation speed fluctuation limit values to serve as a target rotation speed gear.
In one embodiment, the step of detecting the rotation speed fluctuation of the motor to obtain a second rotation speed fluctuation value, and determining the target rotation speed gear according to the second rotation speed fluctuation value and the second weight gear interval includes:
and when the motor is subjected to primary rotation speed fluctuation detection, determining a target rotation speed gear in one of a plurality of preset rotation speed gear groups according to a detected second rotation speed fluctuation value, wherein each rotation speed gear group comprises at least one rotation speed gear, and for a rotation speed fluctuation limit value corresponding to the second weight gear interval, the target rotation speed gear is a highest rotation speed gear of which the corresponding rotation speed fluctuation limit value in the rotation speed gear group is above the second rotation speed fluctuation value.
Speed changes such as speed reduction or speed increase can exist between every rotation speed fluctuation detection, and one rotation speed can be continuously maintained unchanged.
Table 1 is also used as an example for explanation. If the predetermined rotational speed gear sets are: the first gear set includes high speed gear positions, the second gear set includes high speed and down shift 1, the third gear set includes high speed, down shift 1 and down shift 2, and the fourth gear set includes high speed, down shift 1, down shift 2 and down shift 3. If the third speed gear group is judged whether to include the target speed gear, and the second weight gear interval corresponds to a large load, the judgment is carried out by using a speed fluctuation limit value corresponding to the large load. Then, the specific judgment logic may be: firstly, carrying out first-time rotation speed fluctuation detection, judging whether a second rotation speed fluctuation value obtained by the detection is below a rotation speed fluctuation limit value corresponding to a high-speed gear, and if so, determining that the target rotation speed gear is the high-speed gear; if not, judging whether the second rotating speed fluctuation value obtained by the detection is below a rotating speed fluctuation limit value corresponding to a rotating speed gear of downshifting 1, and if so, determining that the target rotating speed gear is downshifting 1; and if not, continuously judging whether the second rotating speed fluctuation value obtained by the detection is below a rotating speed fluctuation limit value corresponding to a rotating speed gear of downshifting 2, if so, determining that the target rotating speed gear is downshifting 2, otherwise, continuously judging the fourth rotating speed gear group. Therefore, for each of the rotation speed fluctuation limits corresponding to the second weight gear range and below which the second rotation speed fluctuation value is located, the target rotation speed gear is the highest rotation speed gear among the rotation speed gears corresponding to each rotation speed fluctuation limit.
By setting a rotating speed gear group, after the rotating speed fluctuation of the motor is detected every time, a target rotating speed gear is judged and determined in the rotating speed gears of the rotating speed gear group, and at least two rotating speed gear groups in each rotating speed gear group comprise the same rotating speed gear, so that more different rotating speed gears can be judged; the rotation speed gears in the same rotation speed gear group are judged from high to low, and the high rotation speed gears can be judged preferentially, so that the final dehydration rotation speed corresponding to the high rotation speed gears is preferentially used for dehydration, the dehydration effect can be improved, the calculation times consumed for searching the optimal target rotation speed gears are minimized, and the calculation cost is saved.
In some embodiments of the present application, the predetermined rotation speed gear groups are sorted in a predetermined order, and each time the motor is subjected to rotation speed fluctuation detection once, whether the target rotation speed gear is included in the rotation speed gear group is determined according to the sorting, and a lowest rotation speed gear in a preceding rotation speed gear group is higher than or equal to a lowest rotation speed gear in a succeeding rotation speed gear group.
Also by taking the aforementioned example of the rotating speed gear groups as an example, in order to determine the target rotating speed gear, the judging sequence of each rotating speed gear group is the first rotating speed gear group, the second rotating speed gear group, the third rotating speed gear group and the fourth rotating speed gear group, the lowest rotating speed gear corresponding to each rotating speed gear group is respectively the high speed, the downshifting 1, the downshifting 2 and the downshifting 3, therefore, the lowest rotating speed gear in the front rotating speed gear group is higher than the lowest rotating speed gear in the rear rotating speed gear group, so that the high rotating speed gear can be tried preferentially, the final dehydration rotating speed corresponding to the high rotating speed gear is preferentially used for dehydration, the dehydration effect can be improved, and the lower rotating speed gear is not included in the front rotating speed gear group, the rotating speed gear can be judged from the high gear to the low gear in sequence, thereby avoiding the lower rotating speed gear being determined as the target rotating speed gear in advance, thereby avoiding the great discount of the dehydration effect.
The user of the drum washing machine may have his own desired speed range, and in the above example, the speed range group includes a high speed range, so that the target speed range is determined for the user selected speed range.
In some embodiments of the present application, before performing a rotation speed fluctuation detection on the motor, obtaining a second rotation speed fluctuation value, and determining a target rotation speed gear according to the second rotation speed fluctuation value and the second weight gear interval, the method further includes:
storing the rotating speed gears in each rotating speed gear group as parameters when a user selects the highest rotating speed gear;
obtaining a preselected rotating speed gear selected by a user;
if the preselected rotation speed gear is not the highest rotation speed gear, acquiring a stored rotation speed gear, and replacing the rotation speed gear higher than the preselected rotation speed gear in each rotation speed gear with the preselected rotation speed gear to obtain a transmission parameter;
the detecting the rotation speed fluctuation of the motor to obtain a second rotation speed fluctuation value, and determining a target rotation speed gear according to the second rotation speed fluctuation value and the second weight gear interval comprises:
detecting the rotation speed fluctuation of the motor to obtain a second rotation speed fluctuation value;
and determining a target rotating speed gear according to the rotating speed gear group corresponding to the transmission parameter and the second rotating speed fluctuation value and the second weight gear interval.
In the embodiment, the rotating speed gears in each rotating speed gear group when the user selects the highest rotating speed gear are stored as parameters in advance, when the target rotating speed gear is determined, the stored parameters are replaced according to the preselected rotating speed gear selected by the user to obtain the transmission parameters, and the target rotating speed gear is determined according to the transmission parameters.
In other embodiments of the present application, different logic codes are configured for different rotational speed gears selected by a user, so that flexibility of code setting can be improved.
In some embodiments of the present application, the set of speed steps comprises all speed steps in a set of speed steps that are ordered before the set of speed steps.
In this embodiment, the gear shift group is progressively determined, and with the advance of the determination process of the target gear shift, not only can the gear shift with low rotation speed be determined, but also the gear shift with high rotation speed that has been determined can be determined by using the latest measured second rotation speed fluctuation value, and when the gear shift with high rotation speed is not omitted, the gear shift with low rotation speed is gradually determined, and the optimal target gear shift can be searched.
The plurality of preset rotating speed gear groups can also be respectively as follows: the first gear set includes speed gears for high and downshift 1, the second gear set includes speed gears for downshift 1 and downshift 2, and the third gear set includes speed gears for downshift 2 and downshift 3. In this case, the highest rotational speed gear in one rotational speed gear group is the lowest rotational speed gear adjacent to the rotational speed gear group and located before the rotational speed gear group in sequence, so that the lower rotational speed gear can be progressively judged while the high rotational speed gear is not omitted, and the better target rotational speed gear can be searched.
In some embodiments of the present application, a rotational speed fluctuation detection is performed on the motor once, and a determination is made as to whether a target rotational speed gear is included in a rotational speed gear group as a determination of the rotational speed gear group; and after the rotating speed gear group is judged for a plurality of times, continuously judging the rotating speed gear group which is arranged behind the rotating speed gear group in sequence.
Also, taking the example of the aforementioned rotational speed gear group as an example, the number of times of determination corresponding to the first rotational speed gear group, the second rotational speed gear group, the third rotational speed gear group, and the fourth rotational speed gear group may be 3 times, 6 times, 3 times, and 12 times, respectively. When the motor is subjected to primary rotation speed fluctuation detection and the first rotation gear group is judged to not comprise the target rotation speed gear, the primary judgment of the first rotation gear group is carried out, then the primary rotation speed fluctuation detection is carried out on the motor, and the next judgment is carried out on the first rotation gear group; and when the target rotating speed gear is not included in the first rotating speed gear group after 3 times of judgment, continuously judging the second rotating speed gear group for 6 times, and so on.
By making several determinations for each speed gear group, rather than one determination, the most appropriate target speed gear can be more fully selected.
The number of times of determination corresponding to each rotational speed shift group may be arbitrary.
In some embodiments of the present application, the lowest rotational speed gear in the front-ranked group of rotational speed gears is higher than the lowest rotational speed gear in the rear-ranked group of rotational speed gears, the number of determinations made for each group of rotational speed gears is different, the number of determinations made for each group of rotational speed gears is predetermined, and the number of determinations made for the front-ranked group of rotational speed gears is smaller than the number of determinations made for the rear-ranked group of rotational speed gears.
For example, the number of times of determination corresponding to the first, second, third, and fourth rotational speed gear groups sequentially ordered in sequence may be 3, 6, 9, and 12, respectively.
In this embodiment, through corresponding the setting lower judgement number of times for the preceding rotational speed gear group of sequencing to corresponding the setting higher judgement number of times for the rotational speed gear group of sequencing after, the rotational speed gear group of sequencing after includes lower rotational speed gear, when can't determine the target rotational speed gear in the preceding rotational speed gear group of sequencing, can pass through the stage of judging lower rotational speed gear rapidly, can improve the efficiency of confirming the target rotational speed gear.
In some embodiments of the present application, if all the speed gear groups do not include the target speed gear, an alarm is processed.
According to the foregoing example, when the first rotational speed gear group, the second rotational speed gear group, the third rotational speed gear group, and the fourth rotational speed gear group are sequentially determined, and the target rotational speed gear cannot be determined, it is described that, for the current load and the current load eccentricity, the final dehydration cannot be performed while maintaining reasonable noise and vibration, and an alarm process is required to avoid occurrence of large noise, vibration, and even failure.
The final dehydration rotation speed corresponding to the target rotation speed gear can be obtained by looking up a table. For example, when the target rotation speed gear is a high-speed gear, the final dehydration rotation speed corresponding to the high-speed gear is 1400rpm, and the motor is controlled to perform final dehydration at the final dehydration rotation speed of 1400 rpm.
In some embodiments of the present application, after detecting the rotation speed fluctuation of the motor to obtain the first rotation speed fluctuation value, the method further includes:
and if the first weight gear interval is a target weight gear interval and the first rotation speed fluctuation value is below a second preset rotation speed fluctuation limit value, determining a target rotation speed gear, and executing the final dehydration step based on the target rotation speed gear, wherein the target weight gear interval is the weight gear interval with the lowest corresponding gear in each weight gear interval.
The first weight gear range may correspond to one of a heavy load, a medium load, a small load, and a single load, where a gear of the weight gear range corresponding to the heavy load is the highest, and a gear of the weight gear range corresponding to the single load is the lowest, and is lower than a gear of the weight gear range corresponding to the small load. And the weight gear interval corresponding to the single load is a target weight gear interval. The second preset speed fluctuation limit is set empirically.
When the first weight gear interval and the second weight gear interval are divided in the same weight gear division mode, a row can be added on the uppermost side of the table 1, and the rotating speed fluctuation limit values corresponding to the single load and each rotating speed gear are recorded at the same time.
In this case, the target rotation speed gear may be determined in the manner of determining the target rotation speed gear described in the above embodiments, for example, the process of determining the target rotation speed gear may include one or more times of detecting rotation speed fluctuation of the motor, and of course, the target rotation speed gear may be determined in other manners.
In the embodiment, when the weight gear interval to which the weight of the load belongs is the weight gear interval with the minimum gear and the rotating speed fluctuation value is reasonable, the load is basically attached to the wall, water is separated along with the increase of the speed, the eccentricity is reduced, the vibration and the noise are controllable, the target rotating speed gear is directly determined and the final dehydration is carried out, so that the dehydration time can be saved under the condition that the vibration and the noise are within a reasonable range.
According to a second aspect of the present application, there is provided a computer readable storage medium storing computer program instructions which, when executed by a computer, cause the computer to perform the method as described above.
According to a third aspect of the present application, there is also provided a drum washing machine including:
a processor;
a memory having computer readable instructions stored thereon which, when executed by the processor, implement the method as previously described.
Fig. 3 is a block diagram illustrating a drum washing machine according to an exemplary embodiment. Referring to fig. 3, the drum washing machine 200 includes a processor 210, a data bus 220, a memory 230, and a motor 240, wherein the motor 240 is electrically connected to the processor 210, the processor 210 obtains computer-readable instructions stored in the memory 230 through the data bus 220, and when the computer-readable instructions stored in the memory 230 are executed by the processor 210, the motor 240 is controlled to operate, so as to execute the spin-drying control method of the drum washing machine according to the embodiments of the present application.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the present application is not limited to the precise arrangements 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 application is limited only by the appended claims.
Claims (10)
1. A dehydration control method of a drum washing machine, characterized by comprising a pre-dehydration stage and a final dehydration stage, wherein:
the pre-dewatering stage comprises:
determining a first load weight of a load, and determining a first weight gear interval to which the first load weight belongs;
detecting the rotation speed fluctuation of the motor to obtain a first rotation speed fluctuation value;
if the first rotation speed fluctuation value is below a rotation speed fluctuation limit value corresponding to the first weight gear interval, executing a pre-dehydration step, wherein the rotation speed fluctuation limit value corresponding to the weight gear interval of the low gear is larger than the rotation speed fluctuation limit value corresponding to the weight gear interval of the high gear, and the pre-dehydration step comprises the following steps: controlling the motor to run at a pre-dehydration rotating speed so as to carry out pre-dehydration;
the final dewatering stage comprises:
determining a second load weight of the load, and determining a second weight gear interval to which the second load weight belongs;
detecting the rotation speed fluctuation of the motor to obtain a second rotation speed fluctuation value, and determining a target rotation speed gear according to the second rotation speed fluctuation value and the second weight gear interval, wherein the second rotation speed fluctuation value is positioned below a rotation speed fluctuation limit value corresponding to the target rotation speed gear in rotation speed fluctuation limit values corresponding to the second weight gear interval, one rotation speed fluctuation limit value simultaneously corresponds to one rotation speed gear and one second weight gear interval, each rotation speed gear corresponds to a final dehydration rotation speed, and the final dehydration rotation speed is greater than the pre-dehydration rotation speed;
performing a final dewatering step, the final dewatering step comprising: and controlling the motor to operate according to the final dehydration rotating speed corresponding to the target rotating speed gear so as to perform final dehydration.
2. The method of claim 1, prior to determining a first load weight of the load and determining a first weight gear range to which the first load weight belongs, the method further comprising:
detecting the rotation speed fluctuation of the motor to obtain a third rotation speed fluctuation value;
and judging whether the third rotating speed fluctuation value is below a first preset rotating speed fluctuation limit value or not, wherein a first load weight of a load is determined, and a first weight gear interval to which the first load weight belongs is determined under the condition that the third rotating speed fluctuation value is below the first preset rotating speed fluctuation limit value.
3. The method of claim 1, wherein the step of determining a first load weight of the load comprises:
recording the time consumed by the free speed reduction of the motor in a preset speed reduction interval;
a first load weight of the load is determined based on the time.
4. The method of claim 1, wherein the step of detecting the speed fluctuation of the motor to obtain the first speed fluctuation value comprises:
controlling the motor to run at a first rotating speed;
the actual rotation speed of the motor during the operation at the first rotation speed is obtained, and a first rotation speed fluctuation value is determined according to the actual rotation speed.
5. The method of claim 1, wherein after detecting the speed ripple of the motor to obtain the first speed ripple value, the method further comprises:
and if the first weight gear interval is a target weight gear interval and the first rotation speed fluctuation value is below a second preset rotation speed fluctuation limit value, determining a target rotation speed gear, and executing the final dehydration step based on the target rotation speed gear, wherein the target weight gear interval is the weight gear interval with the lowest corresponding gear in each weight gear interval.
6. The method of claim 1, wherein said step of detecting a speed fluctuation of said electric machine to obtain a second speed fluctuation value, and determining a target speed range based on said second speed fluctuation value and said second weight range interval comprises:
and when the motor is subjected to primary rotation speed fluctuation detection, determining a target rotation speed gear in one of a plurality of preset rotation speed gear groups according to a detected second rotation speed fluctuation value, wherein each rotation speed gear group comprises at least one rotation speed gear, and for a rotation speed fluctuation limit value corresponding to the second weight gear interval, the target rotation speed gear is a highest rotation speed gear of which the corresponding rotation speed fluctuation limit value in the rotation speed gear group is above the second rotation speed fluctuation value.
7. Method according to claim 6, characterized in that the predetermined number of groups of speed steps is ordered in a predetermined order, and that each time a speed fluctuation detection is performed on the electric machine, a decision is made as to whether a target speed step is included in the group of speed steps according to the order in which the lowest speed step in the preceding group of speed steps is higher than or equal to the lowest speed step in the following group of speed steps.
8. The method according to claim 7, wherein a rotation speed fluctuation detection is performed for the motor, and a determination as to whether or not a target rotation speed gear is included in a rotation speed gear group is performed as a determination for the rotation speed gear group; and after the rotating speed gear group is judged for a plurality of times, continuously judging the rotating speed gear group which is arranged behind the rotating speed gear group in sequence.
9. A computer-readable storage medium, characterized in that it stores computer program instructions which, when executed by a computer, cause the computer to perform the method according to any one of claims 1 to 8.
10. A drum washing machine characterized by comprising:
a processor;
a memory having stored thereon computer readable instructions which, when executed by the processor, implement the method of any of claims 1 to 8.
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