CN111118820A - Eccentricity detection method and device for drum washing machine - Google Patents
Eccentricity detection method and device for drum washing machine Download PDFInfo
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- CN111118820A CN111118820A CN202010040239.7A CN202010040239A CN111118820A CN 111118820 A CN111118820 A CN 111118820A CN 202010040239 A CN202010040239 A CN 202010040239A CN 111118820 A CN111118820 A CN 111118820A
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- 238000005406 washing Methods 0.000 title claims abstract description 57
- 238000001514 detection method Methods 0.000 title claims abstract description 42
- 238000005303 weighing Methods 0.000 claims abstract description 81
- 230000018044 dehydration Effects 0.000 claims abstract description 32
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims description 30
- 238000005259 measurement Methods 0.000 claims description 25
- 238000004364 calculation method Methods 0.000 claims description 14
- 230000001133 acceleration Effects 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 208000005156 Dehydration Diseases 0.000 description 19
- 230000008569 process Effects 0.000 description 17
- 238000009826 distribution Methods 0.000 description 14
- 230000008859 change Effects 0.000 description 6
- 238000012935 Averaging Methods 0.000 description 2
- 230000008901 benefit Effects 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
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000000630 rising effect Effects 0.000 description 1
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Abstract
The embodiment of the invention provides an eccentricity detection method and device. The eccentricity detection method comprises the following steps: when the drum washing machine executes a dehydration program, controlling the motor to run at a higher speed until the rotating speed of the drum reaches a first rotating speed and then keeping the rotating speed at the first rotating speed; measuring the fluctuation amount of the roller as a first fluctuation amount; carrying out weighing operation; obtaining a first eccentricity 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 eccentricity based on the weighing result and the second fluctuation amount; obtaining a third eccentricity based on the first eccentricity and the second eccentricity; the drum is accelerated from the first rotation speed until the rotation speed of the drum reaches the second rotation speed based on the third eccentricity amount to perform high-speed dehydration. The third eccentricity amount is determined based on the eccentricity amount calculated twice by measuring the fluctuation amount of the drum rotation speed before and after the weighing operation. The condition that the judged state of the drum washing machine is inaccurate and the washing machine generates excessive loss due to inaccurate eccentric amount is avoided.
Description
Technical Field
The embodiment of the invention relates to the technical field of dehydration treatment of washing machines, in particular to an eccentricity detection method and device for 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 drum type washing machine (BLDC and DD motor) got into the dehydration stage, if load (clothing in the drum) when the distribution is unbalanced in the drum, the too big condition of vibration appears in the dehydration in-process drum, probably leads to drum striking washing machine box to along with the rising of motor speed can cause the vibration and the noise of the whole machine of washing machine more and more big, bring not good experience for the user, the time can reduce washing machine's life for a long time, therefore the converter need possess the eccentric function of detecting. When the load is found to be distributed and unbalanced in the roller, the unbalanced state of the load can be changed by reducing the running rotating speed or reversing and shaking, so that the effect of reducing the vibration and the noise of the whole machine is achieved.
At present, in the modern eccentricity detection technology, firstly, the fluctuation quantity of the drum of the washing machine is obtained through detection, then the weight of a load in the drum is obtained, and finally, the eccentricity quantity of the drum is obtained through formula operation obtained through curve fitting. The load in the drum is weighed by changing the rotating speed of the drum, and the load distribution in the drum is changed due to the change of the rotating speed, so that the fluctuation amount of the drum of the washing machine at the moment is changed. The system adjusts the operation state of the washing machine according to the eccentric amount, and if the eccentric amount obtained by calculating the fluctuation amount measured before has a certain error, the problems of excessive loss of the washing machine and the like can be caused.
Disclosure of Invention
Because the existing eccentricity detection technical scheme has the problems that the fluctuation quantity of the washing machine drum is measured inaccurately, so that the calculation has errors, and the washing machine is excessively worn, an improved eccentricity detection scheme is very needed to solve the technical problems.
In this context, embodiments of the present invention are intended to provide a method and apparatus for detecting eccentricity of a drum washing machine.
In a first aspect of embodiments of the present invention, there is provided an eccentricity detection method for a drum washing machine including a motor and a drum driven by the motor, comprising:
when the drum washing machine executes a dehydration program, controlling the motor to run at a higher speed until the rotating speed of the drum reaches a first rotating speed, and controlling the motor to keep the drum running at the first rotating speed;
measuring the first fluctuation amount of the rotating speed of the roller to obtain a first fluctuation amount;
carrying out weighing operation;
obtaining a first eccentricity based on the weighing result and the first fluctuation amount;
measuring the rotation speed fluctuation amount of the drum for the second time to obtain a second fluctuation amount;
obtaining a second eccentricity based on the weighing result and the second fluctuation amount;
obtaining a third eccentricity based on the first eccentricity and the second eccentricity;
controlling the motor to accelerate based on the third eccentricity amount such that the drum is accelerated from a first rotation speed until the rotation speed of the drum reaches a second rotation speed to perform high-speed dehydration.
In an embodiment of the present invention, after the step of performing the first measurement of the fluctuation amount of the drum rotation speed to obtain the first fluctuation amount, the method further includes the steps of:
comparing the first fluctuation amount with the preset fluctuation amount threshold value;
if the first fluctuation amount is larger 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 within a predetermined time.
In yet another embodiment of the present invention, the weighing operation comprises:
controlling the motor such that a rotation speed of the drum is accelerated from the first rotation speed to a third rotation speed;
after the third rotating speed is reached, the motor enables the rotating speed of the drum to be reduced from the third rotating speed to a first rotating speed, and the rotating speed of the drum is stabilized at the first rotating speed;
the load in the drum is weighed during acceleration or deceleration.
In a further embodiment of the present invention, after the step of obtaining the first eccentricity based on the weighing result and the first fluctuation amount, the method further comprises the steps of:
comparing the first eccentricity with a preset eccentricity threshold;
if the first eccentricity is greater than or equal to the preset eccentricity threshold, performing eccentricity adjustment;
if the first eccentricity is smaller than the preset eccentricity threshold, executing the measurement of the rotation speed fluctuation of the drum for the second time to obtain a second fluctuation;
in still another embodiment of the present invention, the step of obtaining the third eccentricity amount based on the first eccentricity amount and the second eccentricity amount further includes:
comparing the difference value of the first eccentricity and the second eccentricity with a preset deviation threshold value;
if the difference value of the first eccentricity and the second eccentricity is smaller than a preset deviation value, the third eccentricity is half of the sum of the first eccentricity and the second eccentricity;
and if the difference value of the first eccentricity and the second eccentricity is greater than or equal to a preset deviation value, enabling the third eccentricity to be equal to the second eccentricity.
In still another embodiment of the present invention, after the step of obtaining the third eccentricity based on the first eccentricity and the second eccentricity, the method further includes the steps of:
comparing the third eccentricity with the preset eccentricity threshold value;
if the third eccentricity is greater than or equal to a preset eccentricity threshold value, performing eccentricity adjustment;
and if the third eccentricity is less than a preset eccentricity threshold value, controlling the motor to accelerate so that the drum accelerates from a first rotating speed until the rotating speed of the motor drum reaches a second rotating speed, so as 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 speed or reversely rotate to shake and disperse the load in the roller;
the eccentricity detection of the drum washing machine is performed again according to the steps of claim 1.
In a second aspect of embodiments of the present invention, there is provided an eccentricity detection apparatus of a drum washing machine including a controller, a measurement sensor, a motor, and a drum driven by the motor;
wherein the controller includes: the device comprises a comparison module, a calculation module, a control module and an eccentricity adjustment module;
the measurement sensor includes: the device comprises a detection module and a weighing module;
when the drum washing machine executes a dehydration program, the control module controls the motor to run at an accelerated speed, and the control module controls the motor to maintain the drum to run at the first rotating speed;
the detection module performs the measurement of the first fluctuation amount of the rotating speed of the roller to obtain a first fluctuation amount and feeds the first fluctuation amount back to the controller;
the weighing module carries out weighing operation on the load in the roller and feeds a weighing result back to the controller;
the calculation module calculates a first eccentricity based on the fed-back weighing result and the first fluctuation amount;
the detection module is used for measuring the second rotation speed fluctuation amount of the roller to obtain a second fluctuation amount and feeding the second fluctuation amount back to the controller;
the calculation module obtains a second eccentricity based on the fed-back weighing result and a second fluctuation amount;
the calculation module obtains a third eccentricity based on the first eccentricity and the second eccentricity;
the control module controls the motor to accelerate based on the third eccentricity amount such that the drum is accelerated from a first rotation speed until the rotation speed of the drum reaches a second rotation speed to perform high-speed dehydration.
In an embodiment of the present invention, after the detecting module performs the measurement of the first fluctuation amount of the drum rotation speed, and obtains the first fluctuation amount and feeds back the first fluctuation amount to the controller:
the comparison module compares the first fluctuation amount with the preset fluctuation amount threshold;
if the first fluctuation amount is larger than or equal to a preset fluctuation amount threshold value, performing eccentricity adjustment by the eccentricity 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 of the actual rotation speed of the drum from the first rotation speed within a predetermined time.
In a further embodiment of the invention, the weighing operation of the weighing module comprises:
the control module controls the motor such that a rotational speed of the drum is accelerated from the first rotational speed to a third rotational speed;
after the third rotating speed is reached, reducing the rotating speed of the drum from the third rotating speed to a first rotating speed, and stabilizing the rotating speed of the drum at the first rotating speed;
the weighing module weighs the load in the drum during acceleration or deceleration.
In still another embodiment of the present invention, after the calculating module calculates the first eccentricity based on the fed-back weighing result and the first fluctuation amount:
the comparison module compares the first eccentricity with a preset eccentricity 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 value, measuring the second rotation speed fluctuation amount of the roller by the detection module;
in still another embodiment of the present invention, the calculating module obtains a third eccentricity amount based on the first eccentricity amount and the second eccentricity amount, further comprising:
the comparison module compares the difference value of the first eccentricity and the second eccentricity with a preset deviation threshold;
if the difference value of the first eccentricity and the second eccentricity is smaller than a preset deviation value, the third eccentricity is half of the sum of the first eccentricity and the second eccentricity;
and if the difference value of the first eccentricity and the second eccentricity is greater than or equal to a preset deviation value, enabling the third eccentricity to be equal to the second eccentricity.
In still another embodiment of the present invention, after the calculating module obtains the third eccentricity amount based on the first eccentricity amount and the second eccentricity amount:
the comparison module compares the third eccentricity with the preset eccentricity 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 less than a preset eccentricity threshold, the control module controls the motor to accelerate so that the drum is accelerated from a first rotating speed until the rotating speed of the drum reaches a second rotating speed, so as 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 speed or reversely rotate to shake and disperse the load in the roller;
and carrying out eccentricity detection on the drum washing machine again.
The eccentricity detection method of the invention respectively measures the rotating speed fluctuation amount of the roller before and after the load in the roller is weighed. The condition that the distribution state of the load in the drum is changed in the weighing process, and the obtained eccentric amount is inaccurate, so that the condition that the state of the drum washing machine is judged inaccurately according to the eccentric amount to cause excessive loss of the washing machine is avoided. Thereby remarkably reducing the loss of the drum washing machine and bringing better experience for users.
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The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the 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 a method of eccentricity detection according to the present invention;
FIG. 3 schematically illustrates 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 with reference to a number of exemplary embodiments. It is understood that these embodiments are given solely for the purpose of enabling those skilled in the art to better understand and to 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.
As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely 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 flow chart of a prior art eccentricity detection method.
S101, controlling a motor to drive a roller to accelerate from a zero rotating speed to a first rotating speed and keeping the motor to operate at the first rotating speed;
s102, measuring the rotation speed fluctuation amount of the roller;
s103, weighing operation;
s104, calculating the eccentricity based on the fluctuation amount and the weighing result;
and S105, controlling the motor to drive the roller to accelerate from the first rotating speed to the second rotating speed based on the eccentricity amount so as to perform high-speed dehydration.
As an example, in the prior art, after the dehydration stage is started, the drum is driven by controlling the motor to make the rotation speed of the drum reach and stabilize at the first rotation speed. 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 measured actual rotating speed of the drum within a preset time (for example, within 5 seconds). Judging whether the fluctuation quantity exceeds a preset fluctuation quantity threshold value, if the fluctuation quantity is larger than or equal to the preset fluctuation quantity threshold value, executing eccentric adjustment, namely controlling a motor to drive a roller to reduce the running rotating speed or reversely rotating to shake up the load in the roller, and restarting a dehydration program; and if the fluctuation amount is smaller than the preset fluctuation amount threshold value, carrying out the next weighing operation. Controlling the motor to drive the drum to accelerate from the first rotating speed to the third rotating speed within a certain set time, and then to decelerate from the third rotating speed to the first rotating speed within the same time, and weighing the load in the drum of the washing machine 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 value or not, and if the eccentricity is greater than or equal to the preset eccentricity threshold value, executing eccentricity adjustment; if the eccentricity is less than the preset eccentricity threshold, the driving roller accelerates from the first rotating speed to the second rotating speed to execute high-speed dehydration, and maintains for a period of time to finish the dehydration stage.
The inventor finds that when the rotating speed of the drum is increased from the first rotating speed to the third rotating speed and is reduced to the first rotating speed in the weighing process, the change of the rotating speed of the drum can cause the load distribution in the drum to change, so that the fluctuation amount of the drum changes. The fluctuation quantity used for calculating the eccentric quantity is the fluctuation quantity measured before weighing, so that the calculated eccentric quantity has a little deviation with the actual eccentric quantity, the judgment of the later period and the preset eccentric quantity threshold value is inaccurate, the excessive loss of the washing machine is caused, and the service life of the washing machine is shortened.
In order to overcome the technical problems, the invention provides an eccentricity detection method and device for a drum washing machine.
The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the invention. In this context, it is to be understood that the preset fluctuation amount threshold, the preset eccentricity amount threshold, the preset deviation threshold, the first rotational speed, the second rotational speed, and the third rotational speed are artificially settable. Moreover, any number of elements in the drawings are by way of example and not by way of limitation, and any nomenclature is used solely for differentiation and not by way of limitation.
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 scenarios are merely illustrated for the convenience of understanding the spirit and principles of the present invention, and the embodiments of the present invention are not limited in this respect. Rather, embodiments of the present 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 dehydration program, controlling a motor to run at a higher speed until the rotating speed of the drum reaches a first rotating speed, and controlling the motor to keep the drum running at the first rotating speed;
s202, measuring the first fluctuation amount of the rotating speed of the roller to obtain a first fluctuation amount;
s203, executing a weighing operation;
s204, obtaining a first eccentricity based on the weighing result and the first fluctuation amount;
s205, measuring the rotation speed fluctuation amount of the drum for the second time to obtain a second fluctuation amount;
s206, obtaining a second eccentricity based on the weighing result and the second fluctuation amount; and
obtaining a third eccentricity based on the first eccentricity and the second eccentricity;
and S207, controlling the motor to run up based on the third eccentricity amount so that the drum is accelerated from the first rotating speed until the rotating speed of the drum reaches the second rotating speed, so as 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 within a certain predetermined time, and the operation at the first rotation speed is maintained to ensure the stable operation of the motor.
After the motor operates stably, the fluctuation amount of the rotating speed of the roller is measured for the first time to obtain a first fluctuation amount. The fluctuation amount is half of the difference between the maximum value and the minimum value of the actual rotating speed of the roller measured in a preset time (for example, 5 seconds). For example, if the first rotation speed is 90rpm, the maximum actually measured rotation speed is 95rpm, and the minimum actually measured rotation speed is 91rpm, 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 rotation speed change of the drum at the moment is large and unstable, if the drum is likely to vibrate too much in the dehydration process, the drum impacts a box body of the washing machine, and therefore, the eccentric adjustment is executed, namely, a motor is controlled to drive the drum to reduce the operation rotation speed or reversely rotate to shake and disperse the load in the drum, so that the operation state of the washing machine returns to the first step of the eccentric detection, and the dehydration program is restarted; if the first fluctuation amount is smaller than the preset fluctuation amount threshold value, the rotating speed of the roller is in a safe range at the moment, and the next process cannot be influenced. For example: presetting a fluctuation threshold value to be 5rpm, and if the measured first fluctuation value is 2rpm which is less than 5rpm, executing other operations; if the measured first fluctuation amount is 6rpm greater than 5rpm, the eccentricity adjustment is performed.
And after the first fluctuation amount is judged to be smaller than the preset fluctuation amount threshold value, carrying out weighing operation. The motor is controlled to drive the roller to accelerate from a first rotating speed to a third rotating speed within a set time, then the roller decelerates from the third rotating speed to the first rotating speed within the same time, and the load in the roller is weighed in the process of acceleration or deceleration. The load is not guaranteed to be evenly distributed in the drum when the drum is rotating, so that the calculation of the mass of the load has no definitive mathematical model. However, the mass of the load can be estimated by the average power or the accumulated power during the acceleration of the motor, i.e. the mass of the load can be calculated by a formula by measuring the power. The mass m of the load in the drum can be obtained by measuring the average power or the cumulative power consumed during the acceleration or deceleration by accelerating and decelerating the drum for a period of time. For example, by placing 1kg, 1.5kg and 2kg of laundry respectively, and accelerating the rotation speed of the motor-driven drum from 90rpm to 150 rpm during the test, the average power p required is 500W, 740W and 1000W respectively, and the formula of the laundry weight m and the average power p is m-2 p. In practice, the weight of the laundry inside the drum can be calculated directly from the average power required to accelerate the rotation speed of the motor-driven drum from 90rpm to 150 rpm by means of the above formula.
Wherein the first rotational speed ensures that the load in the drum is close to the drum wall, thus ensuring that the obtained mass is accurate during weighing.
And calculating the first fluctuation amount and the weighing result according to an eccentricity formula to obtain a first eccentricity. The first eccentricity is compared with a preset eccentricity threshold, and if the first eccentricity is greater than or equal to the preset eccentricity threshold, it indicates that the deviation between the rotation center of the drum rotation and the set center is large, and the drum is likely to impact the washing machine box body due to excessive vibration, so that the eccentricity adjustment is performed. If the first eccentricity is smaller than the preset eccentricity threshold, the rotation center deviation of the roller is in a safe range at the moment, and the next process cannot be influenced. The eccentricity is difficult to measure in the operation of the drum washing machine in practical application, the eccentricity, the fluctuation and the load weight have a certain relation, and the washing machine can be fitted according to multiple groups of data of Z (eccentricity), Y (fluctuation) and X (load weight) before leaving a factory, so that a formula for calculating the eccentricity through the fluctuation and the load weight is fitted. The fitted eccentricity formula may be: Z-aXY2+ bXY + cX + dY + e, where a, b, c, d, e are all constants. It is assumed that constants obtained by fitting a plurality of sets of data are: when a is 6, b is c, d, e, h, 0, the eccentricity is expressed by the formula：Z＝6*10-3XY2. For example: assuming the measured first fluctuation amount Y1Is 2rpm, is less than the preset fluctuation threshold value of 5rpm, the weight X of the load is 5000g, and the first eccentricity Z is calculated according to an eccentricity formula1Was 120 g. If the predetermined eccentricity threshold is 450g, the following steps may be performed.
After the first eccentricity is judged to be smaller than the preset eccentricity threshold value, the second measurement of the rotation speed fluctuation amount of the roller is carried out on the weighed roller to obtain a second fluctuation amount Y2。
According to the second fluctuation quantity and the weighing result, according to the formula Z6 10-3XY2Calculating to obtain a second eccentricity Z2. First, a first eccentricity Z is measured1And a second eccentricity Z2If the difference value of the first eccentricity and the second eccentricity is smaller than the preset deviation value, the weighing process of the roller is indicated, the load distribution in the roller is not changed greatly, the measurement deviation is in the error range, and the third eccentricity is half of the sum of the first eccentricity and the second eccentricity so as to obtain a more accurate measurement result and reduce the measurement error; if the difference value of the first eccentricity and the second eccentricity is larger than or equal to the preset deviation value, the weighing process of the roller is indicated, the load distribution in the roller is greatly changed, the measurement error range is exceeded, the originally measured first eccentricity is invalid, and the third eccentricity is equal to the second eccentricity. After the third eccentricity is obtained, the third eccentricity is compared with a preset eccentricity threshold, and if the third eccentricity is greater than or equal to the preset eccentricity threshold, eccentricity adjustment is executed; and if the third eccentricity is smaller than the preset eccentricity threshold, controlling the motor to drive the roller to accelerate from the first rotating speed to the second rotating speed within 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 example: assuming that the second fluctuation amount is 4rpm and is less than the preset fluctuation amount threshold value of 5rpm, the load weight is 5000g, and the formula Z of the eccentricity amount is 6 × 10-3XY2The second eccentricity is calculated to be 480 g. Assuming that the predetermined deviation threshold is 200g, the first eccentricity and the second eccentricity areIf the difference value of the eccentricity is 360g and is greater than the preset deviation threshold value 200g, it indicates that the distribution of the clothes is changed greatly after the weighing operation, and the originally measured first eccentricity is not applicable, the third eccentricity is 480g and is greater than the preset eccentricity threshold value 450g, and the eccentricity adjustment is needed. Or the second fluctuation amount is 3rpm and is less than the preset fluctuation amount threshold value 5rpm, the load weight is 5000g, and the second eccentricity amount is 270g calculated according to the eccentricity amount formula. If the preset deviation threshold is 200g, and the difference value between the first eccentricity and the second eccentricity is 150g and is smaller than the preset deviation threshold 200g, the eccentricity calculated twice is within the error range, and a more accurate result can be obtained by averaging, and the third eccentricity is calculated to be equal to the average value between the first eccentricity and the second eccentricity and is 195g, and the third eccentricity is smaller than the preset eccentricity threshold 450g, so that high-speed dewatering can be performed.
In the dewatering program of the drum washing machine, the eccentricity detection method comprises the steps of firstly measuring the fluctuation of the rotating speed of the drum for the first time, then weighing the load in the drum, measuring the fluctuation of the rotating speed of the drum for the second time after weighing, and obtaining the first eccentricity and the second eccentricity according to the first fluctuation, the second fluctuation and the weighing result. Making a difference value between the first eccentricity and the second eccentricity, and if the difference value is smaller than a preset deviation value, indicating that the load distribution in the roller after the weighing operation is not changed greatly from the load distribution before the weighing, enabling the third eccentricity to be used for measuring the average value of the first eccentricity and the second eccentricity so as to obtain an accurate measuring result; if the difference value is larger than or equal to the preset deviation value, the load distribution in the roller after the weighing operation and the change before the weighing are larger, at the moment, the second eccentricity more accurately represents the state of the roller, and the third eccentricity is made equal to the second eccentricity. The eccentricity detection method of the invention respectively measures the rotating speed fluctuation amount of the roller before and after the load in the roller is weighed. The condition that the distribution state of the load in the drum is changed in the weighing process, and the obtained eccentric amount is inaccurate, so that the condition that the state of the drum washing machine is judged inaccurately according to the eccentric amount to cause excessive loss of the washing machine is avoided.
Having described the method of the exemplary embodiment of the present invention, an eccentricity detection apparatus of a drum washing machine according to an exemplary embodiment of the present invention will be described with reference to fig. 3. As shown in fig. 3, the eccentricity detecting apparatus 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 and is used for controlling the rotating speed of the motor 302;
the motor 302 is connected to the roller 303 through a transmission device and is used for driving the roller 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.
And a controller 301 for controlling the motor 302 and the data processing at a later stage. 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 for controlling the motor 302 to drive the drum 303 to rotate when the dehydration program is executed. In executing step S201, the rotational speed of the motor 302 driving the drum 303 is controlled to accelerate to a first rotational speed; when step S202 is executed, the control motor 302 maintains the rotation speed of the driving roller 303 at the first rotation speed for a certain time; when step S203 is executed, the rotation speed of the drum 303 driven by the motor 302 is controlled to accelerate to the third rotation speed within a set time and decelerate to the first rotation speed within 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 the drum 303 is controlled to be accelerated to the second rotation speed for a set time to perform high-speed dehydration at the execution of step S207.
The comparing 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 within a safety range, that is, within a preset threshold range; after step S204 is executed, comparing the first eccentricity with a preset eccentricity threshold, and determining whether the first eccentricity is within a safety range; after step S206 is executed, the difference between the first eccentricity and the second eccentricity is compared with the preset deviation value, the range of the difference is determined, and the third eccentricity is compared with the preset eccentricity threshold value, so as to determine whether the third eccentricity is within the safety range.
A calculating module 307, which calculates a first eccentricity according to the measured first fluctuation amount and the load weighing result and an eccentricity formula when executing step S204; in step S206, a second eccentricity is calculated according to the measured second fluctuation amount and the load weighing result according to the eccentricity formula, and a third eccentricity is calculated according to the judgment results of the first eccentricity and the second eccentricity.
The eccentricity adjustment module 308 compares the values with the comparison module 306 to obtain a comparison result, and determines whether to perform eccentricity adjustment according to the comparison result. Which 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, carrying out eccentricity adjustment; if the first eccentricity is judged to be larger than or equal to the preset eccentricity value, namely the first eccentricity is out of the safety range, carrying out eccentricity adjustment; and if the third eccentricity is judged to be larger than or equal to the preset eccentricity value, namely the third eccentricity is out of the safety range, carrying out eccentricity adjustment. The eccentricity adjustment is to control the motor 302 to drive the drum 303 to reduce the operation speed or reverse to loose the load in the drum, so that the operation state of the washing machine returns 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 detecting module 309 detects the fluctuation amount of the rotation speed of the washing machine drum 303 when steps S202 and S205 are executed, respectively, obtains the first fluctuation amount and the second fluctuation amount, and feeds back the result to the controller 301.
The weighing module 310 weighs the load inside the drum 303 and feeds back the resulting weighing result to the controller 301 when performing step S203.
Specifically, as shown in fig. 2, when the drum washing machine executes the spin-drying process, the control module 305 first controls the motor 302 to drive the drum 303 to accelerate from a zero rotation speed or a certain rotation speed to a first rotation speed within a certain predetermined time, and the motor is operated at the first rotation speed to ensure stable operation of the motor.
After the motor 302 operates stably, 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 within a predetermined time (e.g., within 5 seconds), and the detection module 309 measures a first amount of fluctuation of the drum 303 by measuring half the difference between the maximum value and the minimum value of the actual rotational speed. For example, if the first rotation speed is 90rpm, the maximum actually measured rotation speed is 95rpm, and the minimum actually measured rotation speed is 91rpm, 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 through the comparison module 306, if the first fluctuation amount is greater than or equal to the preset fluctuation amount threshold value, it is indicated that the rotation speed of the drum 303 at this time is changed greatly and unstable, if the drum is likely to vibrate too much in the dehydration process, so that the drum impacts the washing machine box body, an eccentric adjustment is performed, that is, the control module 305 controls the motor 302 to drive the drum 303 to reduce the operation rotation speed or reversely rotate to shake and disperse the load in the drum 303, so that the operation state of the washing machine returns to the first step of the eccentric detection, and the dehydration program is restarted; if the first fluctuation amount is smaller than the preset fluctuation amount threshold, it indicates that the rotation speed of the drum 303 is in the safe range at this time, and the next process is not affected. For example: presetting a fluctuation threshold value to be 5rpm, and if the measured first fluctuation value is 2rpm which is less than 5rpm, executing other operations; if the measured first fluctuation amount is 6rpm greater than 5rpm, the eccentricity adjustment is performed.
After the first fluctuation amount is judged to be smaller than the preset fluctuation amount threshold value, the weighing module 310 performs a weighing operation. The control module 305 first controls the motor 302 to drive the drum 303 to accelerate from the first rotation speed to the third rotation speed within a set time, and then to decelerate from the third rotation speed to the first rotation speed within the same time, and the weighing module 310 weighs the load in the drum 303 during acceleration or deceleration. When the drum 303 is rotating, there is no guarantee of a uniform distribution of the load within the drum 303, and therefore there is no definite mathematical model for the calculation of the mass of the load. However, the average power or the accumulated power during the acceleration of the motor 302 can be used to estimate the mass of the load, i.e., the mass of the load can be calculated by a formula through 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 the acceleration or deceleration, and the mass m of the load in the drum 303 is obtained. For example, by placing 1kg, 1.5kg and 2kg of laundry respectively, and accelerating the rotation speed of the motor-driven drum from 90rpm to 150 rpm during the test, the average power p required is 500W, 740W and 1000W respectively, and the formula of the laundry weight m and the average power p is m-2 p. In practice, the weight of the laundry inside the drum can be calculated directly from the average power required to accelerate the rotation speed of the motor-driven drum from 90rpm to 150 rpm by means of the above formula.
Wherein the first rotation speed ensures that the load in the drum 303 is close to the drum wall, which ensures that the obtained mass is accurate during weighing.
The first fluctuation amount and the weighing result are calculated according to the eccentricity formula calculation module 307 to obtain a first eccentricity. The comparison module 306 is further required to compare the first eccentricity with a preset eccentricity threshold, and if the first eccentricity is greater than or equal to the preset eccentricity threshold, it indicates that the deviation between the rotation center of the drum rotation and the set center is large, and it is likely that the drum 303 collides with the washing machine casing due to excessive vibration, so that the eccentricity adjustment is required. If the first eccentricity is smaller than the preset eccentricity threshold, it indicates that the rotation center deviation of the roller 303 is within the safe range at this time, and the next process is not affected. The eccentricity is difficult to measure in the operation of the drum washing machine in practical application, the eccentricity, the fluctuation and the load weight have a certain relation, and the washing machine can be fitted according to multiple groups of data of Z (eccentricity), Y (fluctuation) and X (load weight) before leaving a factory, so that a formula for calculating the eccentricity through the fluctuation and the load weight is fitted. The fitted eccentricity formula may be: Z-aXY2+ bXY + cX + dY + e, where a, b, c, d, e are all constants. It is assumed that constants obtained by fitting a plurality of sets of data are: when a is 6, b is c, d, e, h, 0, the eccentricity is given by the formula: z6 x 10-3XY2. For example: assuming the measured first fluctuation amount Y1Is 2rpm and less than the preset fluctuation threshold value of 5rpm, and the weight of the loadThe quantity X is 5000g, and a first eccentricity Z is calculated according to an eccentricity formula1Was 120 g. If the predetermined eccentricity threshold is 450g, the following steps may be performed.
After the first eccentricity is judged to be smaller than the preset eccentricity threshold, the detection module 309 measures the rotation speed fluctuation of the drum 303 for the second time to obtain a second fluctuation Y2。
The calculating module 307 calculates the second fluctuation amount and the weighing result according to the formula Z6 x 10-3XY2Calculating to obtain a second eccentricity Z2. First, the comparison module 306 compares the first eccentricity Z1And a second eccentricity Z2If the difference between the first eccentricity and the second eccentricity is smaller than the preset deviation value, the weighing process of the roller 303 is described, the load distribution inside the roller 303 is not changed too much, the measurement deviation is within the error range, and the calculation module 307 makes the third eccentricity be half of the sum of the first eccentricity and the second eccentricity so as to obtain a more accurate measurement result and reduce the measurement error; if the difference between the first eccentricity and the second eccentricity is greater than or equal to the preset deviation value, it indicates that the weighing process of the roller 303 causes a large change to the load distribution inside the roller 303, and the measured first eccentricity is out of the measurement error range, and then the calculating module 307 makes the third eccentricity equal to the second eccentricity. After the third eccentricity is obtained, the comparing module 306 further needs to compare the third eccentricity with a preset eccentricity threshold, and if the third eccentricity is greater than or equal to the preset eccentricity threshold, perform eccentricity adjustment; if the third eccentricity is less than the preset eccentricity threshold, the control motor 302 drives the drum 303 to accelerate from the first rotation speed to the second rotation speed within a certain set time, so as to perform high-speed dehydration. Wherein the second rotational speed is greater than the first rotational speed.
The following example: assuming that the second fluctuation amount is 4rpm and is less than the preset fluctuation amount threshold value of 5rpm, the load weight is 5000g, and the formula Z of the eccentricity amount is 6 × 10-3XY2The second eccentricity is calculated to be 480 g. Assuming that the preset deviation threshold is 200g, and the difference between the first eccentricity and the second eccentricity is 360g greater than the preset valueIf the deviation threshold is 200g, it indicates that the distribution of the clothes is changed greatly after the weighing operation, and the originally measured first eccentricity is not applicable, the third eccentricity is 480g equal to the second eccentricity, and the third eccentricity is greater than the preset eccentricity threshold 450g, and the eccentricity adjustment is required. Or the second fluctuation amount is 3rpm and is less than the preset fluctuation amount threshold value 5rpm, the load weight is 5000g, and the second eccentricity amount is 270g calculated according to the eccentricity amount formula. If the preset deviation threshold is 200g, and the difference value between the first eccentricity and the second eccentricity is 150g and is smaller than the preset deviation threshold 200g, the eccentricity calculated twice is within the error range, and a more accurate result can be obtained by averaging, and the third eccentricity is calculated to be equal to the average value between the first eccentricity and the second eccentricity and is 195g, and the third eccentricity is smaller than the preset eccentricity threshold 450g, so that high-speed dewatering can be performed.
It should be noted that although in the above detailed description several units/modules or sub-units/modules of the eccentricity detection device are mentioned, this division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the units/modules described above may be embodied in one unit/module according to embodiments of the invention. Conversely, the features and functions of one unit/module described above may be further divided into embodiments by a plurality of units/modules.
Moreover, while the operations of the method of the invention are depicted in the drawings in a particular order, this does not require or imply that the operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
While the spirit and principles of the 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 is the division of aspects, which is for convenience only as the features in such aspects may not be combined to benefit. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. An eccentricity detection method of a drum washing machine including a motor and a drum driven by the motor, comprising:
when the drum washing machine executes a dehydration program, controlling the motor to run at a higher speed until the rotating speed of the drum reaches a first rotating speed, and controlling the motor to keep the drum running at the first rotating speed;
measuring the first fluctuation amount of the rotating speed of the roller to obtain a first fluctuation amount;
carrying out weighing operation;
obtaining a first eccentricity based on the weighing result and the first fluctuation amount;
measuring the rotation speed fluctuation amount of the drum for the second time to obtain a second fluctuation amount;
obtaining a second eccentricity based on the weighing result and the second fluctuation amount;
obtaining a third eccentricity based on the first eccentricity and the second eccentricity;
controlling the motor to accelerate based on the third eccentricity amount such that the drum is accelerated from a first rotation speed until the rotation speed of the drum reaches a second rotation speed to perform high-speed dehydration.
2. The method according to claim 1, further comprising, after said step of performing a first measurement of the amount of fluctuation of the rotational speed of the drum to obtain a first amount of fluctuation, the steps of:
comparing the first fluctuation amount with the preset fluctuation amount threshold value;
if the first fluctuation amount is larger 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 the actual rotation speed of the drum from the first rotation speed measured during a predetermined time.
4. The method of claim 1, the weighing operation comprising:
controlling the motor such that a rotation speed of the drum is accelerated from the first rotation speed to a third rotation speed;
after the third rotating speed is reached, the motor enables the rotating speed of the drum to be reduced from the third rotating speed to a first rotating speed, and the rotating speed of the drum is stabilized 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 eccentricity with a preset eccentricity threshold;
if the first eccentricity is greater than or equal to the preset eccentricity threshold, performing eccentricity adjustment;
and if the first eccentricity is smaller than the preset eccentricity threshold, executing the measurement of the rotation speed fluctuation of the drum for the second time to obtain a second fluctuation.
6. An eccentricity detection apparatus of a drum washing machine, the drum washing machine including a controller, a measurement sensor, a motor, and a drum driven by the motor;
wherein the controller includes: the device comprises a comparison module, a calculation module, a control module and an eccentricity adjustment module;
the measurement sensor includes: the device comprises a detection module and a weighing module;
when the drum washing machine executes a dehydration program, the control module controls the motor to run at an accelerated speed, and the control module controls the motor to maintain the drum to run at the first rotating speed;
the detection module performs the measurement of the first fluctuation amount of the rotating speed of the roller to obtain a first fluctuation amount and feeds the first fluctuation amount back to the controller;
the weighing module carries out weighing operation on the load in the roller and feeds a weighing result back to the controller;
the calculation module calculates a first eccentricity based on the fed-back weighing result and the first fluctuation amount;
the detection module is used for measuring the second rotation speed fluctuation amount of the roller to obtain a second fluctuation amount and feeding the second fluctuation amount back to the controller;
the calculation module obtains a second eccentricity based on the fed-back weighing result and a second fluctuation amount;
the calculation module obtains a third eccentricity based on the first eccentricity and the second eccentricity;
the control module controls the motor to accelerate based on the third eccentricity amount such that the drum is accelerated from a first rotation speed until the rotation speed of the drum reaches a second rotation speed to perform high-speed dehydration.
7. The apparatus of claim 6, wherein the detection module performs a first measurement of the amount of fluctuation of the rotational speed of the drum, and after the first amount of fluctuation is fed back to the controller:
the comparison module compares the first fluctuation amount with the preset fluctuation amount threshold;
if the first fluctuation amount is larger than or equal to a preset fluctuation amount threshold value, performing eccentricity adjustment by the eccentricity 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.
8. The apparatus of claim 6, wherein the detecting module detects the first fluctuation amount as an average deviation value of the actual rotation speed of the drum from the first rotation speed within a predetermined time.
9. The apparatus of claim 6, the weighing operation of the weighing module comprising:
the control module controls the motor such that a rotational speed of the drum is accelerated from the first rotational speed to a third rotational speed;
after the third rotating speed is reached, reducing the rotating speed of the drum from the third rotating speed to a first rotating speed, and stabilizing the rotating speed of the drum at the first rotating speed;
the weighing module weighs the load in the drum during acceleration or deceleration.
10. The apparatus of claim 6, wherein the calculating module calculates a first eccentricity based on the fed-back weighing result and the first fluctuation amount, and then:
the comparison module compares the first eccentricity with a preset eccentricity 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 eccentricity is smaller than the preset eccentricity threshold value, measuring the second rotation speed fluctuation amount of the roller by the detection module.
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