CN111118820B - Eccentric detection method and device for drum washing machine - Google Patents
Eccentric detection method and device for drum washing machine Download PDFInfo
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- CN111118820B CN111118820B CN202010040239.7A CN202010040239A CN111118820B CN 111118820 B CN111118820 B CN 111118820B CN 202010040239 A CN202010040239 A CN 202010040239A CN 111118820 B CN111118820 B CN 111118820B
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- 238000005406 washing Methods 0.000 title claims abstract description 61
- 238000001514 detection method Methods 0.000 title claims abstract description 47
- 238000005303 weighing Methods 0.000 claims abstract description 86
- 230000018044 dehydration Effects 0.000 claims abstract description 25
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 39
- 238000005259 measurement Methods 0.000 claims description 27
- 238000004364 calculation method Methods 0.000 claims description 22
- 230000001133 acceleration Effects 0.000 claims description 19
- 230000008569 process Effects 0.000 description 24
- 208000005156 Dehydration Diseases 0.000 description 18
- 238000009826 distribution Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 7
- 238000012935 Averaging Methods 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Abstract
The embodiment of the invention provides an eccentric detection method and device. The eccentricity detection method comprises the following steps: when the drum washing machine executes a dewatering program, controlling a motor to run in an accelerating way until the rotating speed of the drum reaches a first rotating speed and then maintains to run at the first rotating speed; measuring the fluctuation amount of the roller as a first fluctuation amount; performing weighing operation; obtaining a first eccentric amount based on the weighing result and the first fluctuation amount; measuring the fluctuation amount of the roller as a second fluctuation amount; obtaining a second eccentric amount based on the weighing result and the second fluctuation amount; obtaining a third eccentric amount based on the first eccentric amount and the second eccentric amount; the drum is accelerated from the first rotational speed until the rotational speed of the drum reaches the second rotational speed based on the third eccentric amount to perform high-speed dehydration. The third eccentric amount is determined based on the two calculated eccentric amounts by measuring the fluctuation amount of the drum rotation speed before and after the weighing operation. The condition that the washing machine generates excessive loss due to inaccurate judgment of the state of the drum washing machine caused by inaccurate eccentric quantity is avoided.
Description
Technical Field
The embodiment of the invention relates to the technical field of dewatering treatment of washing machines, in particular to a method and a device for detecting eccentricity of a drum washing machine.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
When a drum washing machine (BLDC and DD motors) enters a dewatering stage, if a load (clothes in the drum) is unbalanced in distribution in the drum, the drum is possibly caused to strike a box body of the washing machine in the dewatering process, and vibration and noise of the whole washing machine are increased along with the increase of the rotation speed of the motor, so that bad experience is brought to a user, the service life of the washing machine is prolonged, and therefore, the frequency converter is required to have an eccentric detection function. When the load is found to be distributed in the roller in an unbalanced way, the unbalanced state of the load can be changed by reducing the running rotating speed or reversing shaking and scattering, so that the effects of reducing the vibration and noise of the whole machine are achieved.
At present, in the modern eccentric detection technology, firstly, the fluctuation amount of a drum of a washing machine is detected, then the weight of a load in the drum is obtained, and finally, the eccentric amount of the drum is obtained through the calculation of a formula obtained through curve fitting. The load inside the drum is weighed by changing the rotation speed of the drum, and the load distribution inside the drum is changed due to the change of the rotation speed, so that the fluctuation amount of the drum of the washing machine is changed. The system adjusts the running state of the washing machine according to the eccentric quantity, and if the eccentric quantity calculated by the fluctuation quantity measured before is continued to have a certain error, the washing machine can cause excessive loss and other problems.
Disclosure of Invention
Because the existing eccentric detection technical scheme has the problem that the fluctuation amount of the drum of the washing machine is measured inaccurately, so that errors exist in calculation, and the washing machine is excessively worn, an improved eccentric detection scheme is very needed to solve the technical problems.
In this context, it is desirable for embodiments of the present invention to provide a drum washing machine eccentricity detection method and apparatus.
In a first aspect of embodiments of the present invention, there is provided a drum washing machine eccentricity detection method, the drum washing machine including a motor and a drum driven by the motor, including:
when the drum washing machine executes a dewatering program, controlling the motor to run in an accelerating way until the rotating speed of the drum reaches a first rotating speed, and controlling the motor to maintain the drum to run at the first rotating speed;
performing measurement of the fluctuation amount of the rotating speed of the first roller to obtain a first fluctuation amount;
performing weighing operation;
obtaining a first eccentric amount based on the weighing result and the first fluctuation amount;
performing the measurement of the fluctuation amount of the rotating speed of the second roller to obtain a second fluctuation amount;
obtaining a second eccentric amount based on the weighing result and the second fluctuation amount;
Obtaining a third eccentric amount based on the first eccentric amount and the second eccentric amount;
controlling the motor acceleration operation based on the third eccentric amount so that the drum accelerates from the first rotational speed until the rotational speed of the drum reaches the second rotational speed to perform high-speed dehydration.
In one embodiment of the present invention, after the step of performing the measurement of the first fluctuation amount of the rotational speed of the drum to obtain the first fluctuation amount, the method further includes the steps of:
comparing the first fluctuation amount with the preset fluctuation amount threshold;
if the first fluctuation amount is greater than or equal to a preset fluctuation amount threshold value, performing eccentricity adjustment;
and if the first fluctuation amount is smaller than a preset fluctuation amount threshold value, executing weighing operation.
In another embodiment of the present invention, the first fluctuation amount is an average deviation value of the actual rotation speed of the drum from the first rotation speed measured in a predetermined time.
In yet another embodiment of the present invention, the weighing operation includes:
controlling the motor so that the rotational speed of the drum accelerates from the first rotational speed to a third rotational speed;
after the third rotating speed is reached, the motor reduces the rotating speed of the roller from the third rotating speed to the first rotating speed, and stabilizes the rotating speed of the roller at the first rotating speed;
The load in the drum is weighed during acceleration or deceleration.
In still another embodiment of the present invention, after the step of obtaining the first eccentric amount based on the weighing result and the first fluctuation amount, the method further includes the steps of:
comparing the first eccentric amount with a preset eccentric amount threshold;
if the first eccentricity is greater than or equal to the preset eccentricity threshold, performing eccentricity adjustment;
if the first eccentric amount is smaller than the preset eccentric amount threshold value, performing measurement of the fluctuation amount of the rotating speed of the second roller to obtain a second fluctuation amount;
in still another embodiment of the present invention, the step of obtaining the third eccentric amount based on the first eccentric amount and the second eccentric amount further includes:
comparing the difference value of the first eccentric amount and the second eccentric amount with a preset deviation threshold value;
if the difference value of the first eccentric amount and the second eccentric amount is smaller than a preset eccentric value, the third eccentric amount is half of the sum of the first eccentric amount and the second eccentric amount;
if the difference value between the first eccentric amount and the second eccentric amount is larger than or equal to a preset eccentric value, the third eccentric amount is enabled to be equal to the second eccentric amount.
In still another embodiment of the present invention, after the step of obtaining the third eccentric amount based on the first eccentric amount and the second eccentric amount, the method further includes the steps of:
Comparing the third eccentric amount with the preset eccentric amount threshold;
if the third eccentricity is greater than or equal to a preset eccentricity threshold, performing eccentricity adjustment;
and if the third eccentric amount is smaller than a preset eccentric amount threshold value, controlling the motor acceleration operation so that the drum is accelerated from the first rotational speed until the rotational speed of the motor drum reaches the second rotational speed to perform high-speed dehydration.
In yet another embodiment of the present invention, the eccentricity adjustment is:
the motor drives the roller to reduce the running rotation speed or reversely shake the load in the roller;
the drum washing machine is again subjected to eccentricity detection according to the steps of claim 1.
In a second aspect of embodiments of the present invention, there is provided a drum washing machine eccentricity detection apparatus, the drum washing machine including a controller, a measurement sensor, a motor, and a drum driven by the motor;
wherein the controller comprises: the device comprises a comparison module, a calculation module, a control module and an eccentric adjustment module;
the measuring sensor includes: the detection module and the weighing module are used for detecting the weight of the weighing module;
when the drum washing machine executes a dehydration program, the control module controls the motor to run in an accelerating way, and the control module controls the motor to maintain the drum to run at the first rotating speed;
The detection module performs measurement of the fluctuation amount of the rotating speed of the first roller to obtain a first fluctuation amount and feeds the first fluctuation amount back to the controller;
the weighing module performs weighing operation on the load in the roller and feeds the weighing result back to the controller;
the calculation module calculates a first eccentric amount based on the feedback weighing result and a first fluctuation amount;
the detection module is used for measuring the fluctuation amount of the second rotating speed of the roller, obtaining the second fluctuation amount and feeding back the second fluctuation amount to the controller;
the calculation module obtains a second eccentric amount based on the feedback weighing result and a second fluctuation amount;
the calculation module obtains a third eccentric amount based on the first eccentric amount and the second eccentric amount;
the control module controls the motor acceleration operation based on the third eccentric amount such that the drum is accelerated from a first rotational speed until the rotational speed of the drum reaches a second rotational speed to perform high-speed dehydration.
In one embodiment of the present invention, the detection module performs measurement of the fluctuation amount of the rotational speed of the drum for the first time, and obtains the first fluctuation amount and feeds back to the controller:
the comparison module compares the first fluctuation amount with the preset fluctuation amount threshold;
If the first fluctuation amount is greater than or equal to a preset fluctuation amount threshold value, executing eccentric adjustment by the eccentric adjustment module;
and if the first fluctuation amount is smaller than a preset fluctuation amount threshold value, the weighing module performs weighing operation on the load in the roller.
In another embodiment of the present invention, the detecting module detects the first fluctuation amount as an average deviation value between the actual rotation speed of the drum and the first rotation speed within a predetermined time.
In yet another embodiment of the present invention, the weighing operation of the weighing module includes:
the control module controls the motor so that the rotating speed of the roller accelerates from the first rotating speed to a third rotating speed;
after the third rotating speed is reached, the rotating speed of the roller is reduced from the third rotating speed to the first rotating speed, and the rotating speed of the roller is stabilized at the first rotating speed;
the weighing module weighs the load in the drum during acceleration or deceleration.
In yet another embodiment of the present invention, the calculation module calculates the first eccentricity amount based on the feedback weighing result and the first fluctuation amount, and then:
the comparison module compares the first eccentric amount with a preset eccentric amount threshold;
If the first eccentricity is greater than or equal to the preset eccentricity threshold, performing eccentricity adjustment by an eccentricity adjustment module;
if the first eccentricity is smaller than the preset eccentricity threshold, the detection module is used for measuring the second rotating speed fluctuation quantity of the roller;
in still another embodiment of the present invention, the calculation module obtains a third eccentric amount based on the first eccentric amount and the second eccentric amount, further comprising:
the comparison module compares the difference value of the first eccentric amount and the second eccentric amount with a preset deviation threshold value;
if the difference value of the first eccentric amount and the second eccentric amount is smaller than a preset eccentric value, the third eccentric amount is half of the sum of the first eccentric amount and the second eccentric amount;
if the difference value between the first eccentric amount and the second eccentric amount is larger than or equal to a preset eccentric value, the third eccentric amount is enabled to be equal to the second eccentric amount.
In yet another embodiment of the present invention, the calculation module obtains the third eccentric amount based on the first eccentric amount and the second eccentric amount after:
the comparison module compares the third eccentric amount with the preset eccentric amount threshold;
if the third eccentricity is greater than or equal to a preset eccentricity threshold, performing eccentricity adjustment by an eccentricity adjustment module;
If the third eccentricity is smaller than a preset eccentricity threshold, the control module controls the motor acceleration operation so that the drum is accelerated from the first rotation speed until the rotation speed of the drum reaches the second rotation speed to perform high-speed dehydration.
In still another embodiment of the present invention, the eccentricity adjustment of the eccentricity adjustment module is:
the control module controls the motor to drive the roller to reduce the running rotating speed or reverse the load in the shake-out roller;
and re-performing eccentricity detection on the drum washing machine.
The eccentricity detection method of the invention respectively measures the fluctuation amount of the rotating speed of the roller before and after the weighing operation of the load in the roller. The condition that the state of the load distributed in the roller is changed in the weighing process, the obtained eccentric quantity is inaccurate, and the condition that the washing machine is excessively worn due to inaccurate judgment of the state of the roller washing machine according to the eccentric quantity is avoided. Therefore, the loss of the drum washing machine is obviously reduced, and better experience is brought to users.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
FIG. 1 schematically illustrates a flow chart of a prior art eccentricity detection method;
FIG. 2 schematically illustrates a flow chart of an eccentricity detection method according to the present invention;
fig. 3 schematically shows an eccentricity detection device according to the present invention;
in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
Detailed Description
The principles and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are presented merely to enable those skilled in the art to better understand and practice the invention and are not intended to limit the scope of the invention in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Those skilled in the art will appreciate that embodiments of the invention may be implemented as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the following forms, namely: complete hardware, complete software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
The principle of the background art of the present invention is explained in detail below with reference to fig. 1.
Fig. 1 is a flowchart of a related art eccentricity detection method.
S101, controlling a motor to drive a roller to accelerate from zero rotation speed to a first rotation speed, and maintaining the roller to run at the first rotation speed;
s102, measuring the rotational speed fluctuation quantity of the roller;
s103, weighing operation;
s104, calculating the eccentric amount based on the fluctuation amount and the weighing result;
s105, controlling the motor to drive the roller to accelerate from the first rotating speed to the second rotating speed based on the eccentric amount so as to execute high-speed dehydration.
As an example, in the related art, after entering the dehydration stage, the rotation speed of the drum is reached and stabilized at the first rotation speed by controlling the motor to drive the drum. The fluctuation amount of the drum is measured, and the fluctuation amount is half of the difference between the maximum value and the minimum value of the actual rotation speed of the drum measured in a predetermined time (for example, 5 seconds). Judging whether the fluctuation amount exceeds a preset fluctuation amount threshold, if so, executing eccentric adjustment, namely controlling the motor to drive the roller to reduce the running rotating speed or reverse the load in the shaking roller, and restarting the dewatering program; and if the fluctuation amount is smaller than a preset fluctuation amount threshold value, carrying out the weighing operation of the next step. The motor is controlled to drive the drum to accelerate from the first rotating speed to the third rotating speed within a certain set time, and then decelerate from the third rotating speed to the first rotating speed within the same time, and the load in the drum of the washing machine is weighed in the process.
And calculating according to the measured fluctuation amount and the weighing result to obtain the eccentricity of the roller. Judging whether the eccentricity exceeds a preset eccentricity threshold, and if the eccentricity is greater than or equal to the preset eccentricity threshold, executing eccentricity adjustment; if the eccentric amount is smaller than the preset eccentric amount threshold value, the driving roller is accelerated from the first rotating speed to the second rotating speed to execute high-speed dehydration, and the dehydration stage is completed for a period of time.
The inventors have found that a change in the rotational speed of the drum during weighing, which is accelerated from a first rotational speed to a third rotational speed, causes a change in the load distribution within the drum, resulting in a change in the amount of fluctuation of the drum. The fluctuation amount used for calculating the eccentric amount is the fluctuation amount measured before weighing, so that the calculated eccentric amount has a little deviation from the actual eccentric amount, the judgment of the later period and the preset eccentric amount threshold value is inaccurate, and the washing machine generates excessive loss, so that the service life of the washing machine is reduced.
In order to overcome the problems of the prior art, the invention provides a method and a device for detecting the eccentricity of a drum washing machine.
The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments thereof. In this context, it is to be understood that the preset fluctuation amount threshold value, the preset decentration amount threshold value, the preset deviation threshold value, the first rotation speed, the second rotation speed, and the third rotation speed are artificially settable. Furthermore, any number of elements in the figures is for illustration and not limitation, and any naming is used for distinction only and not for any limiting sense.
An eccentricity detection method for a drum washing machine according to an exemplary embodiment of the present invention will be described with reference to fig. 2. It should be noted that the above application scenario is only shown for the convenience of understanding the spirit and principle of the present invention, and the embodiments of the present invention are not limited in any way. Rather, embodiments of the invention may be applied to any scenario where applicable.
As shown in fig. 2, the eccentricity detection method according to the embodiment of the present invention at least includes:
s201, when the drum washing machine executes a dewatering program, controlling a motor to run in an accelerating way until the rotating speed of the drum reaches a first rotating speed, and controlling the motor to maintain the drum to run at the first rotating speed;
s202, measuring the fluctuation amount of the rotating speed of the first roller to obtain a first fluctuation amount;
s203, performing weighing operation;
s204, obtaining a first eccentric amount based on the weighing result and the first fluctuation amount;
s205, performing measurement of the fluctuation amount of the rotating speed of the second roller to obtain a second fluctuation amount;
s206, obtaining a second eccentric amount based on the weighing result and the second fluctuation amount; and
obtaining a third eccentric amount based on the first eccentric amount and the second eccentric amount;
s207, controlling the motor acceleration operation based on the third eccentric amount so that the drum accelerates from the first rotational speed until the rotational speed of the drum reaches the second rotational speed to perform high-speed dehydration.
As an example, when the drum washing machine performs the dehydration process, the motor is first controlled to drive the drum to accelerate from a zero rotation speed or a certain rotation speed to a first rotation speed for a certain predetermined time, and to maintain the stable operation of the motor at the first rotation speed.
After the motor stably operates, the fluctuation amount of the rotating speed of the roller is measured for the first time, and the first fluctuation amount is obtained. The fluctuation amount is half of the difference between the maximum value and the minimum value of the actual rotation speed of the drum measured in a predetermined time (for example, 5 seconds). For example, the first rotational speed is 90rpm (revolutions per minute), the maximum value of the rotational speed actually measured is 95rpm, and the minimum value of the rotational speed is 91rpm, and the first fluctuation amount is (95-91)/2=2 rpm. After the first fluctuation amount is obtained, the first fluctuation amount is compared with a preset fluctuation amount threshold value, if the first fluctuation amount is larger than or equal to the preset fluctuation amount threshold value, the rotating speed change of the drum at the moment is larger and unstable, if the drum is likely to strike the washing machine box body due to overlarge vibration in the continuous propelling and dewatering process, the eccentricity adjustment is needed to be executed, namely the motor is controlled to drive the drum to reduce the running rotating speed or reversely shake the load in the drum, so that the running state of the washing machine returns to the first step of eccentricity detection, and the dewatering process is restarted; if the first fluctuation amount is smaller than the preset fluctuation amount threshold, the rotating speed of the roller is in a safe range, and the next process is not influenced. For example: the preset fluctuation amount threshold is 5rpm, and if the measured first fluctuation amount is 2rpm and less than 5rpm, other operations can be executed; if the measured first fluctuation amount is 6rpm and more than 5rpm, the eccentricity adjustment is performed.
And after judging that the first fluctuation amount is smaller than a preset fluctuation amount threshold value, carrying out weighing operation. Firstly, controlling a motor to drive a roller to accelerate from a first rotating speed to a third rotating speed within a set time, then decelerating from the third rotating speed to the first rotating speed within the same time, and weighing a load in the roller in the acceleration or deceleration process. When the drum rotates, the uniform distribution of the load in the drum cannot be ensured, so that the calculation of the mass of the load has no definite mathematical model. However, the average power or the accumulated power in the acceleration process of the motor can be used for estimating the mass of the load, namely, the mass of the load can be calculated through a formula by measuring the power. By accelerating and decelerating the drum for a period of time, the average power or the accumulated power consumed in the acceleration or deceleration process is measured, and the mass m of the load in the drum can be obtained. For example, by placing 1kg, 1.5kg, and 2kg of laundry, respectively, during the test, by accelerating the rotation speed of the motor-driven drum from 90 rpm to 150 rpm, the average power p required for each of 500W, 740W, and 1000W is calculated, and the formula of the laundry weight m and the average power p is calculated as m=2p. In actual operation, the weight of the clothes in the drum can be calculated directly from the average power required to accelerate the rotation speed of the motor-driven drum from 90 rpm to 150 rpm by the above formula.
The first rotating speed ensures that the load in the roller is close to the wall of the roller, so that the obtained quality is accurate in the weighing process.
And calculating the first fluctuation amount and the weighing result according to an eccentric amount formula to obtain a first eccentric amount. The first eccentric amount is compared with a preset eccentric amount threshold value, if the first eccentric amount is larger than or equal to the preset eccentric amount threshold value, the deviation between the rotating center of the drum and the set center is larger, and the drum is likely to impact the washing machine box body due to excessive vibration, so that the eccentric adjustment is required to be executed. If the first eccentric amount is smaller than the preset eccentric amount threshold, the fact that the rotating center deviation of the roller is in a safe range at the moment is indicated, and the influence on the following process is avoided. Because the eccentric amount is difficult to measure in the running of the drum washing machine in practical application, the eccentric amount, the fluctuation amount and the load weight have a certain relation, and the washing machine is fitted according to multiple groups of data of Z=eccentric amount, Y=fluctuation amount and X=load weight before leaving the factory, so that a formula for calculating the eccentric amount through the fluctuation amount and the load weight is fitted. The fit eccentricity formula may be: z= aXY 2 + bXY +cx+dy+e, wherein a, b, c, d, e are all constants. The constants obtained by fitting the sets of data are assumed to be: a=6, b=c=d=e=h=0, then the eccentricity formula is: z=6×10 -3 XY 2 . For example: assuming a measured first fluctuation amount Y 1 2rpm, less than the preset fluctuation threshold value of 5rpm, the weight X of the load is 5000g, and the first eccentric amount Z is calculated according to an eccentric amount formula 1 120g. If the preset eccentricity threshold is 450g, the following steps may be performed.
After judging that the first eccentric amount is smaller than the preset eccentric amount threshold value, measuring the fluctuation amount of the rotating speed of the roller for the second time after weighing to obtain a second fluctuation amount Y 2 。
According to the second fluctuation amount and the weighing result, according to the formula z=6×10 -3 XY 2 Calculating to obtain a second eccentric amount Z 2 . First, the first eccentric amount Z 1 And a second eccentric amount Z 2 Comparing the difference between the first eccentric amount and the second eccentric amount with a preset deviation threshold value, if the difference between the first eccentric amount and the second eccentric amount is smaller than the preset deviation value, indicating that the weighing process of the roller does not cause too large load distribution in the rollerThe measurement deviation is in the error range, and the third eccentric amount is half of the sum of the first eccentric amount and the second eccentric amount, so that a more accurate measurement result is obtained, and the measurement error is reduced; if the difference value of the first eccentric amount and the second eccentric amount is larger than or equal to the preset eccentric value, the weighing process of the roller is described, the load distribution in the roller is greatly changed, the load distribution exceeds the measuring error range, the originally measured first eccentric amount is invalid, and the third eccentric amount is equal to the second eccentric amount. After the third eccentric amount is obtained, the third eccentric amount is compared with a preset eccentric amount threshold value, and if the third eccentric amount is larger than or equal to the preset eccentric amount threshold value, eccentric adjustment is executed; if the third eccentric amount is smaller than the preset eccentric amount threshold value, the motor is controlled to drive the roller to accelerate from the first rotating speed to the second rotating speed in a certain set time so as to execute high-speed dehydration. Wherein the second rotational speed is greater than the first rotational speed.
The following examples: assuming that the second fluctuation amount is 4rpm, which is less than the preset fluctuation amount threshold value of 5rpm, the load weight is 5000g, and the second fluctuation amount is represented by the eccentricity formula Z=6x10 -3 XY 2 The second eccentricity was calculated to be 480g. Assuming that the preset deviation threshold is 200g, if the difference between the first eccentric amount and the second eccentric amount is 360g and is greater than the preset deviation threshold of 200g, it indicates that the distribution of the clothes is greatly changed after the weighing operation, the first eccentric amount measured originally is not applicable, and the third eccentric amount is equal to the second eccentric amount of 480g and is greater than the preset eccentric amount threshold of 450g, and eccentric adjustment is needed. Or the second fluctuation amount is 3rpm, is smaller than the preset fluctuation amount threshold value of 5rpm, the load weight is 5000g, and the second eccentricity is 270g according to an eccentricity formula. Assuming that the preset deviation threshold is 200g, the difference between the first eccentric amount and the second eccentric amount is 150g less than the preset deviation threshold of 200g, the two calculated eccentric amounts are within the error range, a more accurate result can be obtained by averaging, and a third eccentric amount equal to the average value of the first eccentric amount and the second eccentric amount is 195g, which is less than the preset eccentric amount threshold of 450g, can be calculated, and high-speed dehydration can be performed.
In the dehydration program of a drum washing machine, the eccentricity detection method of the invention firstly carries out fluctuation amount measurement of a first rotating speed on a drum, then carries out weighing operation on a load in the drum, carries out fluctuation amount measurement of a second rotating speed on the drum after the weighing operation, and obtains a first eccentricity and a second eccentricity according to the first fluctuation amount, the second fluctuation amount and a weighing result. If the difference value is smaller than the preset deviation value, indicating that the load distribution in the roller is not changed much after the weighing operation and before the weighing operation, enabling the third eccentric amount to measure the average value of the first eccentric amount and the second eccentric amount so as to obtain an accurate measurement result; if the difference is greater than or equal to the preset deviation value, the load distribution in the roller after weighing operation and the change before weighing are larger, and the second eccentric amount more accurately represents the state of the roller, so that the third eccentric amount is equal to the second eccentric amount. The eccentricity detection method of the invention respectively measures the fluctuation amount of the rotating speed of the roller before and after the weighing operation of the load in the roller. The condition that the state of the load distributed in the roller is changed in the weighing process, the obtained eccentric quantity is inaccurate, and the condition that the washing machine is excessively worn due to inaccurate judgment of the state of the roller washing machine according to the eccentric quantity is avoided.
Having described the method of an exemplary embodiment of the present invention, next, an eccentricity detection apparatus of a drum washing machine of an exemplary embodiment of the present invention is described with reference to fig. 3. As shown in fig. 3, the eccentricity detection device of the drum washing machine includes: a controller 301, a motor 302, a drum 303, and a measurement sensor 304. Wherein, the connection mode is as follows:
the controller 301 is connected to the motor 302 for controlling the rotational speed of the motor 302;
the motor 302 is connected to the drum 303 through a transmission device for driving the drum 303 to rotate;
the measuring sensor 304 is connected to the drum 303 for measuring the rotational speed of the drum 303 and the weight of the load in the drum 303;
the measurement sensor 304 feeds back the measurement result to the controller 301.
A controller 301 for controlling the motor 302 and the later data processing. The controller 301 includes: a control module 305, a comparison module 306, a calculation module 307, and an eccentricity adjustment module 308.
The control module 305 is used to control the motor 302 to drive the drum 303 to rotate when the dehydration process is performed. When step S201 is performed, the rotational speed of the driving roller 303 of the control motor 302 is accelerated to a first rotational speed; when executing step S202, controlling the motor 302 to drive the rotation speed of the drum 303 at the first rotation speed for a certain time; when step S203 is performed, the rotation speed of the drum 303 driven by the control motor 302 is accelerated to a third rotation speed within a set time and is decelerated to a first rotation speed at the same time; when steps S204 to S206 are executed, the rotation speed of the motor 302 driving the drum 303 is controlled to be maintained at the first rotation speed; the rotation speed of the motor 302 driving drum 303 is controlled to be accelerated to the second rotation speed for a set time to perform high-speed dehydration in performing step S207.
The comparison module 306 compares the first fluctuation amount with a preset fluctuation amount threshold after executing the step S202, and determines whether the first fluctuation amount is in a safety range, that is, within a preset threshold range; after executing step S204, comparing the first eccentric amount with a preset eccentric amount threshold value, and judging whether the first eccentric amount is in a safety range; after step S206 is performed, the difference between the first eccentric amount and the second eccentric amount is compared with a preset eccentric amount, the range of the difference is determined, and the third eccentric amount is compared with a preset eccentric amount threshold value, so as to determine whether the third eccentric amount is in a safe range.
The calculating module 307 calculates a first eccentric amount according to the eccentric amount formula according to the measured first fluctuation amount and the load weighing result when executing the step S204; when executing step S206, a second eccentric amount is calculated according to the measured second fluctuation amount and the load weighing result according to the eccentric amount formula, and a third eccentric amount is calculated according to the judgment results of the first eccentric amount and the second eccentric amount.
The eccentricity adjustment module 308 compares the values by the comparison module 306 to obtain a comparison result, and determines whether to perform eccentricity adjustment according to the comparison result. The method comprises the following steps: if the first fluctuation amount is larger than or equal to the preset fluctuation amount value, namely the first fluctuation amount is out of the safety range, eccentric adjustment is carried out; if the first eccentric amount is larger than or equal to the preset eccentric amount value, namely the first eccentric amount is out of the safety range, eccentric adjustment is carried out; and if the third eccentric amount is larger than or equal to the preset eccentric amount value, namely the third eccentric amount is out of the safety range, performing eccentric adjustment. The eccentricity is adjusted to control the motor 302 to drive the drum 303 to reduce the operation rotation speed or reverse the load in the shaking drum, so that the operation state of the washing machine is returned to the first step of eccentricity detection, i.e., the dehydration process is restarted.
A measuring sensor 304 for measuring data of the drum 303. The measurement sensor 304 includes: a detection module 309 and a weighing module 310.
The detection module 309 detects the rotational speed fluctuation amount of the drum 303 of the washing machine to obtain a first fluctuation amount and a second fluctuation amount, and feeds back the results to the controller 301 when executing steps S202 and S205.
The weighing module 310 weighs the load inside the drum 303 and feeds back the weighing result to the controller 301 when executing step S203.
Specifically, as shown in fig. 2, when the drum washing machine performs the dehydration process, the control module 305 first controls the motor 302 to drive the drum 303 to accelerate from zero rotation speed or a certain rotation speed to a first rotation speed for a certain predetermined time, and maintains the first rotation speed to ensure the stable operation of the motor.
After the motor 302 is stably operated, the fluctuation amount of the rotation speed of the drum 303 is measured for the first time, and the first fluctuation amount is obtained. The amount of fluctuation is a first amount of fluctuation of the drum 303 measured by the detection module 309 for a predetermined time (e.g., 5 seconds) by measuring a half of the difference between the maximum value and the minimum value of the actual rotational speed. For example, the first rotational speed is 90rpm (revolutions per minute), the maximum value of the rotational speed actually measured is 95rpm, and the minimum value of the rotational speed is 91rpm, and the first fluctuation amount is (95-91)/2=2 rpm. After the first fluctuation amount is obtained, the comparison module 306 is used for comparing the first fluctuation amount with a preset fluctuation amount threshold, if the first fluctuation amount is greater than or equal to the preset fluctuation amount threshold, the rotating speed change of the drum 303 is larger and unstable, if the drum is likely to impact the washing machine box due to excessive vibration in the continuous propelling and dewatering process, the eccentric adjustment is needed, namely the control module 305 controls the motor 302 to drive the drum 303 to reduce the running rotating speed or reverse shaking the load in the drum 303, so that the running state of the washing machine returns to the first step of eccentric detection, and the dewatering process is restarted; if the first fluctuation amount is smaller than the preset fluctuation amount threshold, it is indicated that the rotation speed of the drum 303 is in the safe range at this time, and the following process will not be affected. For example: the preset fluctuation amount threshold is 5rpm, and if the measured first fluctuation amount is 2rpm and less than 5rpm, other operations can be executed; if the measured first fluctuation amount is 6rpm and more than 5rpm, the eccentricity adjustment is performed.
After determining that the first fluctuation amount is smaller than the preset fluctuation amount threshold, the weighing module 310 performs a weighing operation. First, the control module 305 controls the motor 302 to drive the drum 303 to accelerate from the first rotation speed to the third rotation speed in a set time, and then decelerate from the third rotation speed to the first rotation speed in the same time, and the weighing module 310 weighs the load in the drum 303 during acceleration or deceleration. The uniform distribution of the load within the drum 303 is not guaranteed when the drum 303 is rotating, so the calculation of the mass of the load has no definite mathematical model. The average or cumulative power during acceleration of the motor 302 is an estimate of the load mass, i.e., the load mass can be calculated by a formula by measuring the power. By accelerating and decelerating the drum 303 over a period of time, the weighing module 310 measures the average or cumulative power consumed during acceleration or deceleration to obtain the mass m of the load within the drum 303. For example, by placing 1kg, 1.5kg, and 2kg of laundry, respectively, during the test, by accelerating the rotation speed of the motor-driven drum from 90 rpm to 150 rpm, the average power p required for each of 500W, 740W, and 1000W is calculated, and the formula of the laundry weight m and the average power p is calculated as m=2p. In actual operation, the weight of the clothes in the drum can be calculated directly from the average power required to accelerate the rotation speed of the motor-driven drum from 90 rpm to 150 rpm by the above formula.
Wherein the first rotational speed is to ensure that the load in the drum 303 is close to the drum wall, thus ensuring accurate quality during weighing.
The first fluctuation amount and the weighing result are calculated according to the eccentric amount formula calculation module 307 to obtain a first eccentric amountAmount of the components. The comparison module 306 is further required to compare the first eccentric amount with a preset eccentric amount threshold, and if the first eccentric amount is greater than or equal to the preset eccentric amount threshold, it indicates that the rotation center of the drum is greatly deviated from the set center, and the drum 303 is likely to strike the washing machine box due to excessive vibration, so that the eccentric adjustment is performed. If the first eccentricity is smaller than the preset eccentricity threshold, it is indicated that the deviation of the rotation center of the drum 303 is in the safe range, and the following process will not be affected. Because the eccentric amount is difficult to measure in the running of the drum washing machine in practical application, the eccentric amount, the fluctuation amount and the load weight have a certain relation, and the washing machine is fitted according to multiple groups of data of Z=eccentric amount, Y=fluctuation amount and X=load weight before leaving the factory, so that a formula for calculating the eccentric amount through the fluctuation amount and the load weight is fitted. The fit eccentricity formula may be: z= aXY 2 + bXY +cx+dy+e, wherein a, b, c, d, e are all constants. The constants obtained by fitting the sets of data are assumed to be: a=6, b=c=d=e=h=0, then the eccentricity formula is: z=6×10 -3 XY 2 . For example: assuming a measured first fluctuation amount Y 1 2rpm, less than the preset fluctuation threshold value of 5rpm, the weight X of the load is 5000g, and the first eccentric amount Z is calculated according to an eccentric amount formula 1 120g. If the preset eccentricity threshold is 450g, the following steps may be performed.
After judging that the first eccentricity is smaller than the preset eccentricity threshold, the detection module 309 measures the fluctuation of the rotation speed of the drum 303 for the second time to obtain a second fluctuation Y 2 。
The calculation module 307 calculates the second fluctuation amount and the weighing result according to the formula z=6x10 -3 XY 2 Calculating to obtain a second eccentric amount Z 2 . First, the comparison module 306 compares the first eccentricity Z 1 And a second eccentric amount Z 2 If the difference between the first and second eccentric amounts is less than the preset deviation threshold, indicating that the weighing process of the drum 303 does not cause too much variation in the load distribution inside the drum 303, when the measured deviation is within the error range, when the calculation module 307 causes the third eccentric amount to beThe total of the first eccentric amount and the second eccentric amount is half, so that a more accurate measurement result is obtained, and the measurement error is reduced; if the difference between the first eccentric amount and the second eccentric amount is greater than or equal to the preset eccentric amount, which indicates that the weighing process of the drum 303 causes great variation to the load distribution inside the drum 303, and the first eccentric amount originally measured is out of the measurement error range, the calculation module 307 makes the third eccentric amount equal to the second eccentric amount. After obtaining the third eccentric amount, the comparison module 306 also needs to compare the third eccentric amount with a preset eccentric amount threshold, and if the third eccentric amount is greater than or equal to the preset eccentric amount threshold, execute eccentric adjustment; if the third eccentricity is smaller than the preset eccentricity threshold, the motor 302 is controlled to drive the drum 303 to accelerate from the first rotation speed to the second rotation speed for a certain set time to perform high-speed dehydration. Wherein the second rotational speed is greater than the first rotational speed.
The following examples: assuming that the second fluctuation amount is 4rpm, which is less than the preset fluctuation amount threshold value of 5rpm, the load weight is 5000g, and the second fluctuation amount is represented by the eccentricity formula Z=6x10 -3 XY 2 The second eccentricity was calculated to be 480g. Assuming that the preset deviation threshold is 200g, if the difference between the first eccentric amount and the second eccentric amount is 360g and is greater than the preset deviation threshold of 200g, it indicates that the distribution of the clothes is greatly changed after the weighing operation, the first eccentric amount measured originally is not applicable, and the third eccentric amount is equal to the second eccentric amount of 480g and is greater than the preset eccentric amount threshold of 450g, and eccentric adjustment is needed. Or the second fluctuation amount is 3rpm, is smaller than the preset fluctuation amount threshold value of 5rpm, the load weight is 5000g, and the second eccentricity is 270g according to an eccentricity formula. Assuming that the preset deviation threshold is 200g, the difference between the first eccentric amount and the second eccentric amount is 150g less than the preset deviation threshold of 200g, the two calculated eccentric amounts are within the error range, a more accurate result can be obtained by averaging, and a third eccentric amount equal to the average value of the first eccentric amount and the second eccentric amount is 195g, which is less than the preset eccentric amount threshold of 450g, can be calculated, and high-speed dehydration can be performed.
It should be noted that although in the above detailed description several units/modules or sub-units/modules of an eccentricity detection device are mentioned, such a division is only exemplary and not mandatory. Indeed, the features and functionality of two or more units/modules described above may be embodied in one unit/module in accordance with embodiments of the present invention. Conversely, the features and functions of one unit/module described above may be further divided into ones that are embodied by a plurality of units/modules.
Furthermore, although the operations of the methods of the present invention are depicted in the drawings in a particular order, this is not required to either imply that the operations must be performed in that particular order or that all of the illustrated operations be performed to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform.
While the spirit and principles of the present invention have been described with reference to several particular embodiments, it is to be understood that the invention is not limited to the disclosed embodiments nor does it imply that features of the various aspects are not useful in combination, nor are they useful in any combination, such as for convenience of description. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (14)
1. A drum washing machine eccentricity detection method, the drum washing machine including a motor and a drum driven by the motor, comprising:
when the drum washing machine executes a dewatering program, controlling the motor to run in an accelerating way until the rotating speed of the drum reaches a first rotating speed, and controlling the motor to maintain the drum to run at the first rotating speed;
performing measurement of the fluctuation amount of the rotating speed of the first roller to obtain a first fluctuation amount;
performing weighing operation;
obtaining a first eccentric amount based on the weighing result and the first fluctuation amount;
performing the measurement of the fluctuation amount of the rotating speed of the second roller to obtain a second fluctuation amount;
obtaining a second eccentric amount based on the weighing result and the second fluctuation amount;
obtaining a third eccentric amount based on the first eccentric amount and the second eccentric amount, including:
comparing the difference value of the first eccentric amount and the second eccentric amount with a preset deviation threshold value;
if the difference value of the first eccentric amount and the second eccentric amount is smaller than a preset eccentric value, the third eccentric amount is half of the sum of the first eccentric amount and the second eccentric amount;
if the difference value between the first eccentric amount and the second eccentric amount is larger than or equal to a preset eccentric value, enabling the third eccentric amount to be equal to the second eccentric amount;
Controlling the motor acceleration operation based on the third eccentric amount so that the drum accelerates from the first rotational speed until the rotational speed of the drum reaches the second rotational speed to perform high-speed dehydration.
2. The method of claim 1, further comprising, after the step of performing the measurement of the first drum rotational speed fluctuation amount to obtain the first fluctuation amount, the steps of:
comparing the first fluctuation amount with a preset fluctuation amount threshold;
if the first fluctuation amount is greater than or equal to a preset fluctuation amount threshold value, performing eccentricity adjustment;
and if the first fluctuation amount is smaller than a preset fluctuation amount threshold value, executing weighing operation.
3. The method of claim 1, wherein the first fluctuation amount is an average deviation value of an actual rotational speed of the drum from the first rotational speed measured for a predetermined time.
4. The method of claim 1, the weighing operation comprising:
controlling the motor so that the rotational speed of the drum accelerates from the first rotational speed to a third rotational speed;
after the third rotating speed is reached, the motor reduces the rotating speed of the roller from the third rotating speed to the first rotating speed, and stabilizes the rotating speed of the roller at the first rotating speed;
The load in the drum is weighed during acceleration or deceleration.
5. The method of claim 1, further comprising, after the step of deriving the first eccentricity based on the weighing result and the first fluctuation amount, the steps of:
comparing the first eccentric amount with a preset eccentric amount threshold;
if the first eccentricity is greater than or equal to the preset eccentricity threshold, performing eccentricity adjustment;
and if the first eccentric amount is smaller than the preset eccentric amount threshold value, performing measurement of the fluctuation amount of the rotating speed of the second roller to obtain a second fluctuation amount.
6. The method of claim 1, further comprising, after the step of deriving the third eccentric amount based on the first eccentric amount and the second eccentric amount, the steps of:
comparing the third eccentric amount with a preset eccentric amount threshold;
if the third eccentricity is greater than or equal to a preset eccentricity threshold, performing eccentricity adjustment;
and if the third eccentric amount is less than a preset eccentric amount threshold value, controlling the motor acceleration operation so that the drum is accelerated from the first rotational speed until the rotational speed of the drum reaches the second rotational speed to perform high-speed dehydration.
7. The method of claim 2, 5 or 6, the eccentricity adjustment being:
The motor drives the roller to reduce the running rotation speed or reversely shake the load in the roller;
and re-performing eccentricity detection on the drum washing machine.
8. An eccentric detection device of a drum washing machine comprises a controller, a measuring sensor, a motor and a drum driven by the motor;
wherein the controller comprises: the device comprises a comparison module, a calculation module, a control module and an eccentric adjustment module;
the measuring sensor includes: the detection module and the weighing module are used for detecting the weight of the weighing module;
when the drum washing machine executes a dewatering program, the control module controls the motor to run in an accelerating way until the rotating speed of the drum reaches a first rotating speed, and then controls the motor to maintain the drum to run at the first rotating speed;
the detection module performs measurement of the fluctuation amount of the rotating speed of the first roller to obtain a first fluctuation amount and feeds the first fluctuation amount back to the controller;
the weighing module performs weighing operation on the load in the roller and feeds the weighing result back to the controller;
the calculation module calculates a first eccentric amount based on the feedback weighing result and a first fluctuation amount;
the detection module is used for measuring the fluctuation amount of the second rotating speed of the roller, obtaining the second fluctuation amount and feeding back the second fluctuation amount to the controller;
The calculation module obtains a second eccentric amount based on the feedback weighing result and a second fluctuation amount;
the calculation module obtains a third eccentric amount based on the first eccentric amount and the second eccentric amount, including:
the comparison module compares the difference value of the first eccentric amount and the second eccentric amount with a preset deviation threshold value;
if the difference value of the first eccentric amount and the second eccentric amount is smaller than a preset eccentric value, the third eccentric amount is half of the sum of the first eccentric amount and the second eccentric amount;
if the difference value between the first eccentric amount and the second eccentric amount is larger than or equal to a preset eccentric value, enabling the third eccentric amount to be equal to the second eccentric amount;
the control module controls the motor acceleration operation based on the third eccentric amount such that the drum is accelerated from a first rotational speed until the rotational speed of the drum reaches a second rotational speed to perform high-speed dehydration.
9. The apparatus of claim 8, wherein the detection module performs measurement of the first drum rotational speed fluctuation amount, and obtains the first fluctuation amount and feeds back to the controller:
the comparison module compares the first fluctuation amount with a preset fluctuation amount threshold value;
If the first fluctuation amount is greater than or equal to a preset fluctuation amount threshold value, executing eccentric adjustment by the eccentric adjustment module;
and if the first fluctuation amount is smaller than a preset fluctuation amount threshold value, the weighing module performs weighing operation on the load in the roller.
10. The apparatus of claim 8, wherein the detection module detects the first fluctuation amount as an average deviation value of an actual rotational speed of the drum from the first rotational speed within a predetermined time.
11. The apparatus of claim 8, the weighing operation of the weighing module comprising:
the control module controls the motor so that the rotating speed of the roller accelerates from the first rotating speed to a third rotating speed;
after the third rotating speed is reached, the rotating speed of the roller is reduced from the third rotating speed to the first rotating speed, and the rotating speed of the roller is stabilized at the first rotating speed;
the weighing module weighs the load in the drum during acceleration or deceleration.
12. The apparatus of claim 9, the calculation module to calculate a first eccentricity based on the feedback weighing result and a first fluctuation amount, followed by:
the comparison module compares the first eccentric amount with a preset eccentric amount threshold;
If the first eccentricity is greater than or equal to the preset eccentricity threshold, performing eccentricity adjustment by an eccentricity adjustment module;
and if the first eccentric amount is smaller than the preset eccentric amount threshold value, the detection module is used for measuring the second rotating speed fluctuation amount of the roller.
13. The apparatus of claim 8, the calculation module to obtain the third eccentricity based on the first and second eccentricities:
the comparison module compares the third eccentric amount with a preset eccentric amount threshold;
if the third eccentricity is greater than or equal to a preset eccentricity threshold, performing eccentricity adjustment by an eccentricity adjustment module;
if the third eccentricity is smaller than a preset eccentricity threshold, the control module controls the motor acceleration operation so that the drum is accelerated from the first rotation speed until the rotation speed of the drum reaches the second rotation speed to perform high-speed dehydration.
14. The apparatus of claim 9, 12 or 13, the eccentricity adjustment of the eccentricity adjustment module being:
the control module controls the motor to drive the roller to reduce the running rotating speed or reverse the load in the shake-out roller;
and re-performing eccentricity detection on the drum washing machine.
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| CN114016250B (en) * | 2021-10-22 | 2023-05-16 | 珠海格力电器股份有限公司 | Shaking-off method and device of washing machine and washing machine |
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