CN113737453B - Method, device and system for detecting rotating speed of washing machine - Google Patents
Method, device and system for detecting rotating speed of washing machine Download PDFInfo
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- CN113737453B CN113737453B CN202111105075.2A CN202111105075A CN113737453B CN 113737453 B CN113737453 B CN 113737453B CN 202111105075 A CN202111105075 A CN 202111105075A CN 113737453 B CN113737453 B CN 113737453B
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
- D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/24—Spin speed; Drum movements
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/38—Time, e.g. duration
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Abstract
The invention provides a method, a device and a system for detecting the rotating speed of a washing machine, wherein the method comprises the following steps: determining a time interval for performing primary rotation speed calculation on an inner barrel of the washing machine; for each time interval: acquiring the closing time and closing times of at least one magnetic control switch arranged on an outer barrel of the washing machine; wherein, when the magnetic element arranged on the inner barrel of the washing machine passes through the magnetic control switch, the magnetic switch is closed; calculating the primary rotating speed of each magnetic control switch by utilizing the closing time and the closing times of the magnetic control switch; and carrying out data processing on each primary rotating speed obtained in at least one time interval to obtain the rotating speed of the inner barrel of the washing machine. The scheme can detect the rotating speed of the washing machine.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a method, a device and a system for detecting the rotating speed of a washing machine.
Background
The washing machine is an indispensable part of the daily household appliances. The current market washing machines can be mainly divided into variable frequency washing machines and non-variable frequency washing machines, however, for the variable frequency washing machines and the non-variable frequency washing machines, the accurate control of the rotating speed is an important parameter for measuring the performance of the washing machines.
Therefore, in order to improve the performance of the washing machine, detection of the rotational speed of the drum of the washing machine is indispensable. Currently, patent application number CN112301641a discloses a method for measuring the rotational speed of a washing machine with a MEMS sensor and a method for detecting displacement data, which are used for detecting the rotational speed by detecting the amplitude by using the MEMS sensor.
However, there are differences in vibration of different washing machines, and the manner of detecting the rotation speed by the amplitude needs to depend on the quality of the filtering algorithm. Therefore, the manner in which the rotational speed is obtained by detecting the amplitude is often less accurate.
Disclosure of Invention
The invention provides a method, a device and a system for detecting the rotating speed of a washing machine, which can detect the rotating speed of the washing machine.
In a first aspect, an embodiment of the present invention provides a method for detecting a rotational speed of a washing machine, including:
determining a time interval for performing primary rotation speed calculation on an inner barrel of the washing machine;
for each time interval:
acquiring the closing time and closing times of at least one magnetic control switch arranged on the outer barrel of the washing machine; wherein, when a magnetic element arranged on the inner barrel of the washing machine passes through the magnetic control switch, the magnetic switch is closed;
calculating the primary rotating speed of each magnetic control switch by utilizing the closing time and the closing times of the magnetic control switch;
and carrying out data processing on each primary rotating speed obtained in at least one time interval to obtain the rotating speed of the inner drum of the washing machine.
In one possible implementation manner, the calculating the primary rotation speed corresponding to the magnetic control switch by using the closing time and the closing times of the magnetic control switch includes:
determining the number X of the magnetic elements;
calculating the primary rotating speed corresponding to the current magnetic control switch by using the following formula I:
wherein s is ij For characterising the primary speed, n, of the current ith magnetically controlled switch in the jth time interval ij For characterising the number of times the current ith magnetically controlled switch is closed in the jth time interval, T ij The method is used for representing the closing time recorded by the current ith magnetic control switch in the jth time interval.
In one possible implementation manner, the data processing on each primary rotation speed obtained in at least one time interval to obtain the rotation speed of the inner tub of the washing machine includes:
determining N time intervals and the number Y of the magnetic switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in N time intervals according to the generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating the rotation speed difference between two adjacent primary rotation speeds to obtain a difference value queue formed by YN-1 rotation speed difference values;
and determining the rotating speed of the inner barrel of the washing machine according to the difference value queue.
In one possible implementation manner, the determining the inner tub rotation speed of the washing machine according to the difference queue includes:
judging whether the absolute value deviation of two adjacent differences in the difference queue is smaller than a preset error or not according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein delta (m) is used for representing the mth difference value in the difference value queue, delta (m-1) is used for representing the mth-1 difference value in the difference value queue, and epsilon is used for representing the preset error;
determining a counting threshold r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting the formula II is larger than the counting threshold r;
if the number of the adjacent difference value pairs meeting the formula II is not less than r, performing arithmetic average calculation on each rotating speed participating in calculating the adjacent difference value pairs to obtain the rotating speed of the inner barrel of the washing machine;
and if the number of adjacent difference pairs meeting the formula II is smaller than r, determining the last rotating speed in the rotating speed queue as the rotating speed of the inner barrel of the washing machine.
In a second aspect, an embodiment of the present invention provides a rotation speed detecting apparatus for a washing machine, including: the system comprises a time interval determining module, a closed data acquisition module, a primary rotating speed calculating module and a data processing module;
the time interval determining module is used for determining the time interval for carrying out primary rotation speed calculation on the inner barrel of the washing machine;
the closed data acquisition module is configured to perform, for each time interval determined by the time interval determination module: acquiring the closing time and closing times of at least one magnetic control switch arranged on the outer barrel of the washing machine; wherein, when a magnetic element arranged on the inner barrel of the washing machine passes through the magnetic control switch, the magnetic switch is closed;
the primary rotating speed calculating module is used for calculating the primary rotating speed of each magnetic control switch according to the closing time and the closing times of the magnetic control switch obtained by the closing data obtaining module;
the data processing module is used for performing data processing on each primary rotating speed obtained by the primary rotating speed calculating module in at least one time interval to obtain the rotating speed of the inner barrel of the washing machine.
In one possible implementation manner, the primary rotation speed calculating module is configured to perform the following operations when calculating the primary rotation speed corresponding to the magnetic control switch by using the closing time and the closing times of the magnetic control switch:
determining the number X of the magnetic elements;
calculating the primary rotating speed corresponding to the current magnetic control switch by using the following formula I:
wherein s is ij For characterising the primary speed, n, of the current ith magnetically controlled switch in the jth time interval ij For characterising the number of times the current ith magnetically controlled switch is closed in the jth time interval, T ij The method is used for representing the closing time recorded by the current ith magnetic control switch in the jth time interval.
In one possible implementation, the data processing module is configured to perform the following operations when performing data processing on each primary rotation speed obtained in at least one time interval to obtain the rotation speed of the inner tub of the washing machine:
determining N time intervals and the number Y of the magnetic switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in N time intervals according to the generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating the rotation speed difference between two adjacent primary rotation speeds to obtain a difference value queue formed by YN-1 rotation speed difference values;
and determining the rotating speed of the inner barrel of the washing machine according to the difference value queue.
In one possible implementation, the data processing module is configured to perform the following operations when determining the inner tub rotation speed of the washing machine according to the difference queue:
judging whether the absolute value deviation of two adjacent differences in the difference queue is smaller than a preset error or not according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein delta (m) is used for representing the mth difference value in the difference value queue, delta (m-1) is used for representing the mth-1 difference value in the difference value queue, and epsilon is used for representing the preset error;
determining a counting threshold r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting the formula II is larger than the counting threshold r;
if the number of the adjacent difference value pairs meeting the formula II is not less than r, performing arithmetic average calculation on each rotating speed participating in calculating the adjacent difference value pairs to obtain the rotating speed of the inner barrel of the washing machine;
and if the number of adjacent difference pairs meeting the formula II is smaller than r, determining the last rotating speed in the rotating speed queue as the rotating speed of the inner barrel of the washing machine.
In a third aspect, an embodiment of the present invention further provides a rotation speed detection system of a washing machine, including: at least one magnetic element, at least one magnetic switch, a rotation speed detection device of the washing machine and a washing machine body according to the second aspect;
the at least one magnetic element is arranged on the inner barrel of the washing machine body, and the at least one magnetic control switch is arranged on the outer barrel of the washing machine body;
each magnetic control switch is electrically connected with a rotating speed detection device of the washing machine;
each magnetic control switch is used for generating a pulse signal when a magnetic element on the inner barrel of the washing machine body passes through and sending the pulse signal to a rotating speed detection device of the washing machine;
the rotating speed detecting device of the washing machine is used for detecting the rotating speed of the inner barrel of the washing machine according to the pulse signals.
In one possible implementation, the at least one magnetic element is uniformly mounted on an outer wall of the inner tub of the washing machine body, and the at least one magnetic switch is uniformly mounted on an inner wall of the outer tub of the washing machine body.
According to the technical scheme, when the rotating speed of the washing machine is detected, firstly, the time interval for carrying out primary rotating speed calculation on the inner barrel of the washing machine can be determined, then, in each time interval, the closing time and the closing times of at least one magnetic switch arranged on the outer barrel of the washing machine are obtained, and the rotating speed of the inner barrel corresponding to each magnetic switch can be calculated by utilizing the closing time and the closing times. Further, the inner tub rotational speed of the washing machine can be obtained by performing data processing on the respective primary rotational speeds obtained in each time interval. Therefore, the scheme adopted by the scheme is that the rotating speed is detected by installing the magnetic element and the magnetic control switch on the inner barrel and the outer barrel. The magnetic element arranged on the inner barrel can pass through the magnetic control switch arranged on the outer barrel due to the rotation of the inner barrel of the washing machine, and the magnetic element can close the magnetic switch when passing through the magnetic control switch, so that the rotating speed of the inner barrel of the washing machine can be accurately calculated by counting the closing times and closing time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for detecting a rotational speed of a washing machine according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a rotation speed detecting device of a washing machine according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a rotation speed detecting system of a washing machine according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
As before, washing machines are an indispensable part of everyday household appliances. Currently, the market's home-market washing machines can be divided into two categories depending on whether frequency conversion technology is used, namely variable frequency washing machines and non-variable frequency washing machines. However, accurate control of the rotational speed is an important parameter for measuring the performance of the washing machine, whether it is a variable frequency washing machine or a non-variable frequency washing machine.
The variable-frequency washing machine often adopts a controller matched with a driving motor as a speed measuring component, and software and hardware required by motor speed measurement are integrated in the controller. The speed measuring mode has the characteristics of low cost and easy application. However, when the washing machine is running at a low speed, it is difficult to perform accurate measurement due to a problem inherent in the drive rotation speed detection method itself. But the non-frequency conversion washing machine generally adopts an alternating current motor as a driving component, a speed measuring motor or a sensor is often added for realizing good rotation speed detection of the motor, and the rotation speed is measured by matching with a corresponding circuit. For example, in the prior art, a rotation speed sensor is directly connected to a rotation shaft of an inner tub of a washing machine to perform rotation speed measurement, and the method can obtain a good test effect at a low speed, but the defects are obvious, namely, the cost is increased and the installation structure is enlarged. Such a disadvantage is disadvantageous for product lifting of the washing machine at the moment that the overall structure of the washing machine tends to be reduced. For another example, in the prior art, an MEMS sensor is also used to detect the amplitude so as to achieve the purpose of detecting the rotation speed, but the vibration of different washing machines has a difference, and the rotation speed detection mode through the amplitude needs to rely on the quality of a filtering algorithm, so that the method cannot accurately detect the rotation speed.
Based on this, this scheme is considered through installing magnetic element on the inner tub, installs the magnetic control switch on the outer tub, and magnetic element can pass through the magnetic control switch when washing machine inner tub rotates to make the magnetic control switch close. Therefore, the accurate measurement of the rotating speed of the washing machine is realized by counting the closing times and closing time of the magnetic control switch.
The method, the device and the system for detecting the rotating speed of the washing machine provided by the invention are further described in detail below.
As shown in fig. 1, an embodiment of the present invention provides a method for detecting a rotational speed of a washing machine, which may include the steps of:
step 101: determining a time interval for performing primary rotation speed calculation on an inner barrel of the washing machine;
for each time interval:
step 102: acquiring the closing time and closing times of at least one magnetic control switch arranged on an outer barrel of the washing machine; wherein, when the magnetic element arranged on the inner barrel of the washing machine passes through the magnetic control switch, the magnetic switch is closed;
step 103: calculating the primary rotating speed of each magnetic control switch by utilizing the closing time and the closing times of the magnetic control switch;
step 104: and carrying out data processing on each primary rotating speed obtained in at least one time interval to obtain the rotating speed of the inner barrel of the washing machine.
In this embodiment, when detecting the rotation speed of the washing machine, the time interval for performing a rotation speed calculation on the inner tub of the washing machine may be first determined, and then, in each time interval, the closing time and the closing times of at least one magnetic switch mounted on the outer tub of the washing machine are obtained, so that the rotation speed of the inner tub corresponding to each magnetic switch may be calculated by using the closing time and the closing times. Further, the inner tub rotational speed of the washing machine can be obtained by performing data processing on the respective primary rotational speeds obtained in each time interval. Therefore, the scheme adopted by the scheme is that the rotating speed is detected by installing the magnetic element and the magnetic control switch on the inner barrel and the outer barrel. The magnetic element arranged on the inner barrel can pass through the magnetic control switch arranged on the outer barrel due to the rotation of the inner barrel of the washing machine, and the magnetic element can close the magnetic switch when passing through the magnetic control switch, so that the rotating speed of the inner barrel of the washing machine can be accurately calculated by counting the closing times and closing time.
The detection of the rotational speed can be performed using the closing time and the number of times of closing in each time interval, however, in the present embodiment, it is considered that a plurality of states are generally present in the washing machine during the washing process. Such as a rotational speed increasing stage, a rotational speed stabilizing stage, and a rotational speed decreasing stage. Therefore, the obtained rotating speed values in a plurality of time intervals are considered to be subjected to further data processing, so that a more accurate rotating speed detection result of the washing machine can be obtained.
In one possible implementation, step 103 may consider calculating the primary rotation speed corresponding to each magnetic switch by using the closing time and the closing number of the magnetic switch to calculate the primary rotation speed corresponding to each magnetic switch as follows:
determining the number X of the magnetic elements;
calculating the primary rotating speed corresponding to the current magnetic control switch by using the following formula I:
wherein s is ij For characterising the primary speed, n, of the current ith magnetically controlled switch in the jth time interval ij For characterising the number of times the current ith magnetically controlled switch is closed in the jth time interval, T ij For characterising the recording of the current ith magnetically controlled switch in the jth time intervalIs used for the closing time of the valve.
In the embodiment of the invention, when determining the primary rotating speed corresponding to each magnetic control switch, the number of the magnetic elements is required to be determined first, and then the primary rotating speed corresponding to the current magnetic control switch can be accurately calculated by utilizing a formula I.
For example, the number of magnetic elements mounted on the inner tub of the washing machine is 3, and in a certain time interval (for example, in the jth time interval), the number of times of closing the first magnetic switch is 10, and the closing time is 2 seconds, then the rotation speed corresponding to the first magnetic switch is: s is(s) 1j = (10-1)/(3*2) = 1.5 rpm, i.e. the primary rpm corresponding to the first magnetically controlled switch is 1.5 rpm during the j-th time interval. Similarly, the first formula can be used for calculating the rotating speeds corresponding to the other two magnetic control switches and the rotating speeds corresponding to the three magnetic control switches in other time intervals, so that the obtained rotating speeds in all the time intervals can be further subjected to data processing, and a more accurate rotating speed detection result is obtained.
In one possible implementation manner, step 104 may be implemented when the data processing is performed on each primary rotation speed obtained in at least one time interval to obtain the rotation speed of the inner tub of the washing machine, where the data processing is implemented in the following manner:
determining N time intervals and the number Y of the magnetic switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in N time intervals according to the generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating the rotation speed difference between two adjacent primary rotation speeds to obtain a difference value queue formed by YN-1 rotation speed difference values;
and determining the rotating speed of the inner barrel of the washing machine according to the difference value queue.
In the embodiment of the invention, when data processing is performed on each primary rotating speed, firstly, the number of time intervals and the number of magnetic switches can be considered to be determined, then, the primary rotating speeds corresponding to each magnetic switch in the time intervals are arranged according to the generation sequence to obtain a rotating speed queue, and then, the difference value of two adjacent rotating speeds in the rotating speed queue is calculated to obtain a difference value queue formed by the rotating speed difference values, so that the rotating speed of the inner barrel of the washing machine can be determined by utilizing the difference value queue.
It can be seen that the present solution arranges the obtained primary rotational speeds and arranges the obtained difference values, so that it can be seen from the arranged queue what state the current washing machine is. For example, when there is no large continuous difference variation in the difference queue, the washing machine may be in a steady state; when a negative value appears in the differential value queue and the absolute value of the negative value is larger, the washing machine may be in a rotation speed decreasing stage; when the difference is a positive value in the queue and the value is large, the washing machine may be in a rotational speed rising stage. Further rotational speed determination may be made based on each stage.
For example, in further determining the rotational speed of the washing machine according to the difference queue, in one possible implementation, the determination may be made by:
judging whether the absolute value deviation of two adjacent differences in the difference queue is smaller than a preset error according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein, delta (m) is used for representing the mth difference value in the difference value queue, delta (m-1) is used for representing the mth-1 difference value in the difference value queue, epsilon is used for representing the preset error;
determining a counting threshold r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting a formula II is larger than a counting threshold r;
if the number of the adjacent difference value pairs meeting the formula II is not less than r, performing arithmetic mean calculation on each rotating speed participating in calculating the adjacent difference value pairs to obtain the rotating speed of the inner barrel of the washing machine;
if the number of adjacent difference pairs meeting the formula II is smaller than r, determining the last rotating speed in the rotating speed queue as the rotating speed of the inner barrel of the washing machine.
In this embodiment, a preset error is set, and then a relationship between two adjacent differences in the difference queue and the preset error is further determined, that is, which of the difference pairs satisfying the relationship has is determined. Further, the number of difference pairs satisfying the relationship is judged to be in relation to the set count threshold, and the inner tub rotation speed of the washing machine is determined.
For example, when the number of the difference pairs satisfying the above relationship is not smaller than the count threshold, it is indicated that the washing machine is in the rotation speed stabilizing stage in this stage, and at this time, the respective rotation speeds participating in calculating the adjacent difference pairs may be calculated as an arithmetic average value, so as to obtain the rotation speed of the inner tub of the washing machine. When the number of the difference pairs meeting the relation is smaller than the counting threshold value, the washing machine is in the revolution change stage, namely the revolution rising stage and the revolution falling stage, and the last revolution value in the revolution queue can be determined as the current inner barrel revolution of the washing machine. Therefore, according to the scheme, different running states of the washing machine are distinguished, different determining modes of the rotating speeds are adopted, and particularly when the washing machine is in a rotating speed stable state, each rotating speed of the washing machine in the stable state is determined, and then the average value of the rotating speeds is used as the current rotating speed, so that the effect of effectively reducing errors can be achieved, and the accuracy of the detected rotating speed value is higher.
For example, when calculating the rotation speed, the detection device records the time lengths of t1, t2, and t3 from the three magnetic switches A, B and C, and the closing times are n1, n2, and n3, so that the rotation speeds s1, s2, and s3 can be measured. Since the rotational speed of the washing machine is dynamically changed, it is considered to divide the change of the rotational speed into three stages: a rotational speed rising stage, a rotational speed stabilizing stage, and a rotational speed falling stage. In order to be able to measure the rotational speeds at the different phases as accurately as possible, it is conceivable to provide a memory beep line inside the detection device for storing the 3N rotational speed values measured in the last N time intervals in the manner shown in table 1 below. In table 1, S11, S12, S1N represent the rotational speed obtained by the a-magnetic switch in the first time interval, the rotational speed obtained by the a-magnetic switch in the second time interval, the rotational speeds obtained by the a-magnetic switch in the nth time interval, and the rotational speeds measured by the B-magnetic switch and the C-magnetic switch are the same, respectively. Namely S YN Indicating the rotation of the Y-th magnetically controlled switch measured during the N-th time intervalAnd (5) speed.
TABLE 1
| S11 | S21 | S31 | S12 | S22 | S32 | S13 | S23 | S33 | … | … | S1N | S2N | S3N |
Further, the difference Δ between two adjacent rotational speeds can be calculated from the above table 1, so that the above 3N rotational speed value data can obtain at most 3N-1 differences, respectively Δ1, Δ2, … …, Δ (3N-1), as shown in the following table 2.
TABLE 2
| Δ1 | Δ2 | Δ3 | Δ4 | … | … | Δ(3N-3) | Δ(3N-2) | Δ(3N-1) |
However, under the unstable rotation speed, the measured rotation speeds of different magnetic switches and magnetic elements also have errors due to the distribution parameters, so that we can further set the preset error epsilon, and then judge the relation between the absolute value deviation of two adjacent difference values and the preset error epsilon. When the absolute value deviation of the adjacent two difference values is not greater than the preset error epsilon, the washing machine can be considered to be basically in a rotating speed stabilizing stage.
In the data processing, the count value is incremented by 1 as long as the above-described relationship is satisfied. If the absolute value of the error which satisfies the r times of calculation is not more than epsilon, all the rotating speed values which participate in the operation of the absolute value of the error can be used as the rotating speed value of the current stable stage after being arithmetically averaged. For example, r is 2 and there are two consecutive absolute errors no greater than ε, which are Δ3, Δ4, and Δ5, respectively. That is, neither the absolute value of Δ4- Δ3 nor the absolute value of Δ5- Δ4 is greater than ε. And Δ3, Δ4 and Δ5 are calculated from S31, S12, S22 and S32, respectively, so that the arithmetic mean value of S31, S12, S22 and S32 is considered as the rotation speed of the current washing machine.
If the absolute value of the calculated error is greater than epsilon, or the accumulated count does not satisfy r times, the washing machine is considered to be in the rotating speed change process, namely, the rotating speed rising stage or the rotating speed falling stage. At this time, the latest enqueued rotation speed value in the current storage queue can be used as the current rotation speed.
As shown in fig. 2, the embodiment of the present invention further provides a rotation speed detection device of a washing machine, which may include: a time interval determining module 201, a closed data acquiring module 202, a primary rotation speed calculating module 203 and a data processing module 204;
a time interval determining module 201 for determining a time interval for performing a rotation speed calculation on the tub of the washing machine;
a closed data acquisition module 202 for performing, for each time interval determined by the time interval determination module 201: acquiring the closing time and closing times of at least one magnetic control switch arranged on an outer barrel of the washing machine; wherein, when the magnetic element arranged on the inner barrel of the washing machine passes through the magnetic control switch, the magnetic switch is closed;
a primary rotation speed calculating module 203, configured to calculate, for each magnetic control switch, a primary rotation speed corresponding to the magnetic control switch by using the closing time and the closing times of the magnetic control switch obtained by the closing data obtaining module 202;
the data processing module 204 is configured to perform data processing on each primary rotational speed obtained by the primary rotational speed calculating module 203 in at least one time interval, so as to obtain the rotational speed of the inner tub of the washing machine.
In one possible implementation, the primary rotation speed calculation module 203 is configured to perform the following operations when calculating the primary rotation speed corresponding to the magnetic switch using the closing time and the closing number of the magnetic switch:
determining the number X of the magnetic elements;
calculating the primary rotating speed corresponding to the current magnetic control switch by using the following formula I:
wherein s is ij For characterising the primary speed, n, of the current ith magnetically controlled switch in the jth time interval ij For characterising the number of times the current ith magnetically controlled switch is closed in the jth time interval, T ij The method is used for representing the closing time recorded by the current ith magnetic control switch in the jth time interval.
In one possible implementation, the data processing module 204 is configured to perform the following operations when performing data processing on each primary rotational speed obtained during at least one time interval to obtain the rotational speed of the inner tub of the washing machine:
determining N time intervals and the number Y of the magnetic switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in N time intervals according to the generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating the rotation speed difference between two adjacent primary rotation speeds to obtain a difference value queue formed by YN-1 rotation speed difference values;
and determining the rotating speed of the inner barrel of the washing machine according to the difference value queue.
In one possible implementation, the data processing module 204 is configured to perform the following operations when determining the inner tub rotational speed of the washing machine from the difference queue:
judging whether the absolute value deviation of two adjacent differences in the difference queue is smaller than a preset error according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein, delta (m) is used for representing the mth difference value in the difference value queue, delta (m-1) is used for representing the mth-1 difference value in the difference value queue, epsilon is used for representing the preset error;
determining a counting threshold r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting a formula II is larger than a counting threshold r;
if the number of the adjacent difference value pairs meeting the formula II is not less than r, performing arithmetic mean calculation on each rotating speed participating in calculating the adjacent difference value pairs to obtain the rotating speed of the inner barrel of the washing machine;
if the number of adjacent difference pairs meeting the formula II is smaller than r, determining the last rotating speed in the rotating speed queue as the rotating speed of the inner barrel of the washing machine.
As shown in fig. 3, the embodiment of the present invention further provides a rotation speed detection system of a washing machine, which may include: at least one magnetic element 301, at least one magnetically controlled switch 302, a rotation speed detecting device 303 of a washing machine according to claims 5 to 8 and a washing machine body 304;
at least one magnetic element 301 is mounted on the inner tub of the washing machine body 304, and at least one magnetic switch 302 is mounted on the outer tub of the washing machine body 304;
each magnetic control switch 302 is electrically connected with a rotating speed detection device 303 of the washing machine;
each magnetic control switch 302 is used for generating a pulse signal when the magnetic element 301 on the inner tub of the washing machine body 304 passes through, and sending the pulse signal to the rotating speed detection device 303 of the washing machine;
the rotation speed detecting device 303 of the washing machine is used for detecting the rotation speed of the inner barrel of the washing machine according to the pulse signal.
In this embodiment, the rotation speed detecting system of the washing machine is composed of a magnetic element 301, a magnetic switch 302, a rotation speed detecting device 303 and a washing machine body 304. Considering that the magnetic element 301 is mounted on the inner tub of the washing machine body 304, the magnetic switch 302 is mounted on the outer tub of the washing machine body 304, and the magnetic switch 302 is electrically connected to the rotation speed detecting device 303 of the washing machine. Thus, when the washing machine is in operation, the inner tub rotates to drive the magnetic element 301 to rotate together, and the magnetic element 301 passes through the magnetic switch 302 mounted on the outer tub during rotation. When the magnetic element 301 passes through the magnetic control switch 302 once, the magnetic control switch 302 is closed, so that the rotating speed detection device 303 can record the closing time and closing times of the magnetic control switch 302 in the working process of the washing machine, and further calculate the rotating speed of the inner barrel of the washing machine. Therefore, the scheme does not need to be provided with a special speed measuring component for the driving motor, has wide application range and is easy to realize. And the rotation speed sensor is not required to be connected to the rotating shaft of the inner tub of the washing machine for rotation speed measurement, so that the cost for detecting the rotation speed is increased, and the installation structure of the washing machine is enlarged, so that the performance improvement of the washing machine is affected.
In addition, the scheme does not relate to signal acquisition by using a sensor so as to determine the rotating speed of the washing machine according to the acquired signals. Therefore, the limitation that the determination of the rotating speed needs to depend on the quality of a filtering algorithm is avoided, and the accuracy determination and the practicability of the rotating speed detection can be improved.
In one possible implementation, the at least one magnetic element 301 is uniformly mounted on the outer wall of the inner tub of the washing machine body 304, and the at least one magnetic switch is uniformly mounted on the inner wall of the outer tub of the washing machine body 304.
In this embodiment, it is considered that the magnetic elements are uniformly mounted on the outer wall of the inner tub of the washing machine body, and the magnetic switch is uniformly mounted on the inner wall of the outer tub of the washing machine body. Therefore, the close contact of the magnetic element and the magnetic control switch can be ensured when the washing machine works, and the triggering sensitivity of the magnetic switch can be improved. And the acquired data can be uniformly distributed through uniform distribution, and the rotating speed calculated by using the data is more accurate.
It will be appreciated that the structure illustrated in the embodiments of the present invention does not constitute a specific limitation on the rotation speed detecting device of the washing machine. In other embodiments of the present invention, the rotational speed detecting device of the washing machine may include more or less parts than those shown, or combine some parts, split some parts, or a different arrangement of parts. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.
The content of information interaction and execution process between the modules in the device is based on the same conception as the embodiment of the method of the present invention, and specific content can be referred to the description in the embodiment of the method of the present invention, which is not repeated here.
The embodiment of the invention also provides a computing device, which comprises: at least one memory and at least one processor;
at least one memory for storing a machine readable program;
at least one processor for invoking a machine readable program to perform the method for detecting a rotational speed of a washing machine in any of the embodiments of the present invention.
The embodiment of the invention also provides a computer readable medium storing instructions for causing a computer to execute the method for detecting the rotational speed of a washing machine as herein. In particular, a method or apparatus provided with a storage medium on which a software program code realizing the functions of any of the above embodiments is stored, and a computer (or CPU or MPU) of the method or apparatus may be caused to read out and execute the program code stored in the storage medium.
In this case, the program code itself read from the storage medium may realize the functions of any of the above-described embodiments, and thus the program code and the storage medium storing the program code form part of the present invention.
Examples of the storage medium for providing the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (e.g., CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), a magnetic tape, a nonvolatile memory card, and a ROM. Alternatively, the program code may be downloaded from a server computer by a communication network.
Further, it should be apparent that the functions of any of the above-described embodiments may be realized not only by executing the program code read out by the computer, but also by an operation method or the like that causes an operation on the computer based on instructions of the program code to complete a part or all of the actual operations.
The foregoing describes certain embodiments of the present invention. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
The foregoing detailed description of the invention has been presented for purposes of illustration and description, and it should be understood that the foregoing is by way of illustration and description only, and is not intended to limit the scope of the invention.
Claims (4)
1. The method for detecting the rotating speed of the washing machine is characterized by comprising the following steps:
determining a time interval for performing primary rotation speed calculation on an inner barrel of the washing machine;
for each time interval:
acquiring the closing time and closing times of at least one magnetic control switch arranged on an outer barrel of the washing machine; wherein, when a magnetic element arranged on the inner barrel of the washing machine passes through the magnetic control switch, the magnetic control switch is closed;
calculating the primary rotating speed of each magnetic control switch by utilizing the closing time and the closing times of the magnetic control switch;
data processing is carried out on each primary rotating speed obtained in at least one time interval, so that the rotating speed of the inner barrel of the washing machine is obtained; the calculating the primary rotating speed corresponding to the magnetic control switch by using the closing time and the closing times of the magnetic control switch comprises the following steps:
determining the number X of the magnetic elements;
calculating the primary rotating speed corresponding to the current magnetic control switch by using the following formula I:
wherein s is ij For characterising the primary speed, n, of the current ith magnetically controlled switch in the jth time interval ij For characterising the number of times the current ith magnetically controlled switch is closed in the jth time interval, T ij The method is used for representing the closing time recorded in the jth time interval of the current ith magnetic control switch;
the data processing of each primary rotating speed obtained in at least one time interval is carried out to obtain the rotating speed of the inner drum of the washing machine, and the method comprises the following steps:
determining N time intervals and the number Y of the magnetic control switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in N time intervals according to the generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating the rotation speed difference between two adjacent primary rotation speeds to obtain a difference value queue formed by YN-1 rotation speed difference values;
determining the rotating speed of an inner barrel of the washing machine according to the difference value queue;
the determining the rotating speed of the inner tub of the washing machine according to the difference value queue comprises the following steps:
judging whether the absolute value deviation of two adjacent differences in the difference queue is smaller than a preset error or not according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein delta (m) is used for representing the mth difference value in the difference value queue, delta (m-1) is used for representing the mth-1 difference value in the difference value queue, and epsilon is used for representing the preset error;
determining a counting threshold r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting the formula II is larger than the counting threshold r;
if the number of the adjacent difference value pairs meeting the formula II is not less than r, performing arithmetic average calculation on each rotating speed participating in calculating the adjacent difference value pairs to obtain the rotating speed of the inner barrel of the washing machine;
and if the number of adjacent difference pairs meeting the formula II is smaller than r, determining the last rotating speed in the rotating speed queue as the rotating speed of the inner barrel of the washing machine.
2. The rotational speed detection device of the washing machine is characterized by comprising: the system comprises a time interval determining module, a closed data acquisition module, a primary rotating speed calculating module and a data processing module;
the time interval determining module is used for determining the time interval for carrying out primary rotation speed calculation on the inner barrel of the washing machine;
the closed data acquisition module is configured to perform, for each time interval determined by the time interval determination module: acquiring the closing time and closing times of at least one magnetic control switch arranged on the outer barrel of the washing machine; wherein, when a magnetic element arranged on the inner barrel of the washing machine passes through the magnetic control switch, the magnetic control switch is closed;
the primary rotating speed calculating module is used for calculating the primary rotating speed of each magnetic control switch according to the closing time and the closing times of the magnetic control switch obtained by the closing data obtaining module;
the data processing module is used for performing data processing on each primary rotating speed obtained by the primary rotating speed calculation module in at least one time interval to obtain the rotating speed of the inner barrel of the washing machine; the primary rotation speed calculation module is configured to execute the following operations when calculating the primary rotation speed corresponding to the magnetic control switch by using the closing time and the closing times of the magnetic control switch:
determining the number X of the magnetic elements;
calculating the primary rotating speed corresponding to the current magnetic control switch by using the following formula I:
wherein s is ij For characterising the primary speed, n, of the current ith magnetically controlled switch in the jth time interval ij For characterising the current ith magnetically controlled switchThe number of closures in the j-th time interval, T ij The method is used for representing the closing time recorded in the jth time interval of the current ith magnetic control switch; the data processing module is configured to execute the following operations when data processing is performed on each primary rotating speed obtained in at least one time interval to obtain the rotating speed of the inner tub of the washing machine:
determining N time intervals and the number Y of the magnetic control switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in N time intervals according to the generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating the rotation speed difference between two adjacent primary rotation speeds to obtain a difference value queue formed by YN-1 rotation speed difference values;
determining the rotating speed of an inner barrel of the washing machine according to the difference value queue; the data processing module is configured to execute the following operations when determining the rotating speed of the inner tub of the washing machine according to the difference value queue:
judging whether the absolute value deviation of two adjacent differences in the difference queue is smaller than a preset error or not according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein delta (m) is used for representing the mth difference value in the difference value queue, delta (m-1) is used for representing the mth-1 difference value in the difference value queue, and epsilon is used for representing the preset error;
determining a counting threshold r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting the formula II is larger than the counting threshold r;
if the number of the adjacent difference value pairs meeting the formula II is not less than r, performing arithmetic average calculation on each rotating speed participating in calculating the adjacent difference value pairs to obtain the rotating speed of the inner barrel of the washing machine;
and if the number of adjacent difference pairs meeting the formula II is smaller than r, determining the last rotating speed in the rotating speed queue as the rotating speed of the inner barrel of the washing machine.
3. A rotation speed detecting system of a washing machine, comprising: at least one magnetic element, at least one magnetically controlled switch, a rotation speed detecting device of a washing machine as claimed in claim 2, and a washing machine body;
the at least one magnetic element is arranged on the inner barrel of the washing machine body, and the at least one magnetic control switch is arranged on the outer barrel of the washing machine body;
each magnetic control switch is electrically connected with a rotating speed detection device of the washing machine;
each magnetic control switch is used for generating a pulse signal when a magnetic element on the inner barrel of the washing machine body passes through and sending the pulse signal to a rotating speed detection device of the washing machine;
the rotating speed detecting device of the washing machine is used for detecting the rotating speed of the inner barrel of the washing machine according to the pulse signals.
4. The system of claim 3, wherein the at least one magnetic element is uniformly mounted on an outer wall of an inner tub of the washing machine body and the at least one magnetically controlled switch is uniformly mounted on an inner wall of an outer tub of the washing machine body.
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| JP2008154314A (en) * | 2006-12-14 | 2008-07-03 | Sharp Corp | Motor driving apparatus and washing machine equipped with same |
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