CN113737453A - 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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- CN113737453A CN113737453A CN202111105075.2A CN202111105075A CN113737453A CN 113737453 A CN113737453 A CN 113737453A CN 202111105075 A CN202111105075 A CN 202111105075A CN 113737453 A CN113737453 A CN 113737453A
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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
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 rotating speed calculation on an inner barrel of the washing machine; for each time interval: acquiring the closing time and the closing times of at least one magnetic control switch arranged on the outer barrel of the washing machine; when a magnetic element arranged on the inner drum of the washing machine passes through the magnetic control switch, the magnetic switch is closed; aiming at each magnetic control switch, 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; and processing data of each primary rotating speed obtained in at least one time interval to obtain the rotating speed of the inner barrel of the washing machine. This scheme can detect washing machine's rotational speed.
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
Washing machines are an indispensable part of daily household appliances. The current market of 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 precise 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, the detection of the rotation speed of the inner drum of the washing machine is indispensable. At present, patent application No. CN112301641A discloses a method for measuring the rotation speed of a washing machine with an MEMS sensor and a method for detecting displacement data, which detect the amplitude by using the MEMS sensor to achieve the purpose of detecting the rotation speed.
However, the vibration of different washing machines is different, and the manner of detecting the rotation speed by the amplitude needs to depend on the quality of a filtering algorithm. Therefore, the method of detecting the amplitude to obtain the rotation speed 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 rotation speed of a washing machine, including:
determining a time interval for performing primary rotating speed calculation on an inner barrel of the washing machine;
for each time interval:
acquiring the closing time and the closing times of at least one magnetic control switch arranged on the outer barrel of the washing machine; when a magnetic element arranged on the inner barrel of the washing machine passes through the magnetic control switch, the magnetic switch is closed;
aiming at each magnetic control switch, 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;
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 a possible implementation manner, the calculating a 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 isijIs used for representing the primary rotating speed n of the current ith magnetic control switch in the jth time intervalijIs used for representing the number of times of closing the current ith magnetic control switch in the jth time interval, TijThe method is used for representing the closing time of the current ith magnetic control switch recorded in the jth time interval.
In one possible implementation manner, the data processing of 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 of said time intervals and a number Y of said magnetic switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in the N time intervals according to a generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating a rotation speed difference value between two adjacent primary rotation speeds to obtain a difference value queue consisting of 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 value queue includes:
judging whether the absolute value deviation of two adjacent difference values in the difference value queue is smaller than a preset error or not according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein, Δ (m) is used for representing the mth difference in the difference queue, Δ (m-1) is used for representing the mth-1 difference in the difference queue, and ε is used for representing the preset error;
determining a counting threshold value r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting the second formula is larger than the counting threshold r or not;
if the number of the adjacent difference value pairs meeting the second formula is not less than r, performing arithmetic mean calculation on the rotating speeds participating in the calculation of the adjacent difference value pairs to obtain the rotating speed of the inner barrel of the washing machine;
and if the number of the adjacent difference value pairs meeting the second formula is less 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 device for a washing machine, including: the device comprises a time interval determining module, a closed data acquiring module, a primary rotating speed calculating module and a data processing module;
the time interval determination module is used for determining the time interval for calculating the primary rotating speed of the inner barrel of the washing machine;
the closed data obtaining module is configured to perform, for each time interval determined by the time interval determining module: acquiring the closing time and the closing times of at least one magnetic control switch arranged on the outer barrel of the washing machine; 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 calculation module is used for calculating the primary rotating speed corresponding to each magnetic control switch by utilizing the closing time and the closing times of the magnetic control switch obtained by the closing data acquisition module;
and the data processing module is used for carrying out 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, 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, the primary rotation speed calculation module is configured to perform the following operations:
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 isijIs used for representing the primary rotating speed n of the current ith magnetic control switch in the jth time intervalijIs used for representing the number of times of closing the current ith magnetic control switch in the jth time interval, TijThe method is used for representing the closing time of the current ith magnetic control switch recorded in the jth time interval.
In one possible implementation, the data processing module, when performing data processing on each primary rotation speed obtained in at least one time interval to obtain the rotation speed of the inner drum of the washing machine, is configured to perform the following operations:
determining N of said time intervals and a number Y of said magnetic switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in the N time intervals according to a generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating a rotation speed difference value between two adjacent primary rotation speeds to obtain a difference value queue consisting of 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, when determining the inner tub rotation speed of the washing machine according to the difference value queue, is configured to perform the following operations:
judging whether the absolute value deviation of two adjacent difference values in the difference value queue is smaller than a preset error or not according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein, Δ (m) is used for representing the mth difference in the difference queue, Δ (m-1) is used for representing the mth-1 difference in the difference queue, and ε is used for representing the preset error;
determining a counting threshold value r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting the second formula is larger than the counting threshold r or not;
if the number of the adjacent difference value pairs meeting the second formula is not less than r, performing arithmetic mean calculation on the rotating speeds participating in the calculation of the adjacent difference value pairs to obtain the rotating speed of the inner barrel of the washing machine;
and if the number of the adjacent difference value pairs meeting the second formula is less 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 detecting system for a washing machine, including: at least one magnetic element, at least one magnetic control switch, the rotating speed detection device of the washing machine and the washing machine body;
the 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;
and the rotating speed detection device of the washing machine is used for detecting the rotating speed of the inner barrel of the washing machine according to the pulse signal.
In a possible implementation manner, the at least one magnetic element is uniformly installed on an outer wall of the inner tub of the washing machine body, and the at least one magnetic switch is uniformly installed 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 calculating the rotating speed of the inner barrel of the washing machine once can be determined, then, the closing time and the closing times of at least one magnetic switch arranged on the outer barrel of the washing machine are obtained in each time interval, and the rotating speed of the inner barrel corresponding to each magnetic control switch can be calculated by utilizing the closing time and the closing times. Further, the inner drum rotating speed of the washing machine can be obtained by processing the data of each primary rotating speed obtained in each time interval. Therefore, the scheme adopted by the scheme is that the rotating speed is detected in a mode of 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 passes 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 used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
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 apparatus of a washing machine according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a rotational speed detection system of a washing machine according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As before, washing machines are an indispensable part of everyday household appliances. The washing machines currently on the market can be classified into two types, i.e., variable frequency washing machines and non-variable frequency washing machines, according to whether or not the variable frequency technology is adopted. However, the accurate control of the rotation speed is an important parameter for measuring the performance of the washing machine, regardless of the variable frequency washing machine or the non-variable frequency washing machine.
The variable frequency washing machine usually 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 operated at a low speed, it is difficult to perform accurate measurement due to the inherent problem of the driver rotation speed detection method. The non-frequency conversion washing machine generally adopts an alternating current motor as a driving part, and a speed measuring motor or a sensor is usually added to the motor in order to realize good rotating speed detection, and a corresponding circuit is matched to realize the rotating speed measurement. For example, in the prior art, a rotating speed sensor is directly connected to a rotating shaft of an inner barrel of a washing machine for rotating speed measurement, and the mode can obtain a better 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 to the product elevation of the washing machine, as the overall structure of the washing machine tends to be reduced. For another example, in the prior art, an MEMS sensor is used to detect the amplitude to achieve the purpose of detecting the rotation speed, but the vibrations of different washing machines are different, and the manner of detecting the rotation speed through the amplitude needs to depend on the quality of a filtering algorithm, and this method often cannot accurately detect the rotation speed.
Based on this, this scheme considers that through installing magnetic element on interior bucket, install the magnetic control switch on the outer bucket, magnetic element can pass through the magnetic control switch when the washing machine inner bucket 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, device and system for detecting the rotation 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 rotation speed of a washing machine, which may include the steps of:
step 101: determining a time interval for performing primary rotating speed calculation on an inner barrel of the washing machine;
for each time interval:
step 102: acquiring the closing time and the closing times of at least one magnetic control switch arranged on the outer barrel of the washing machine; when a magnetic element arranged on the inner drum of the washing machine passes through the magnetic control switch, the magnetic switch is closed;
step 103: aiming at each magnetic control switch, 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;
step 104: and processing data of 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, first, a time interval for performing a rotation speed calculation on the inner tub of the washing machine may be 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 may be obtained, so that the rotation speed of the inner tub corresponding to each magnetic control switch may be calculated by using the closing time and the closing times. Further, the inner drum rotating speed of the washing machine can be obtained by processing the data of each primary rotating speed obtained in each time interval. Therefore, the scheme adopted by the scheme is that the rotating speed is detected in a mode of 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 passes 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 rotation speed can be performed using the closing time and the number of times of closing in each time interval, however, in this embodiment, it is considered that the washing machine generally has a plurality of states during the washing process. Such as a speed-up phase, a speed-stabilization phase and a speed-down phase. Therefore, the rotation speed values obtained in a plurality of time intervals are considered to be further processed, so that a more accurate detection result of the rotation speed of the washing machine can be obtained.
In a possible implementation manner, when the step 103 calculates the primary rotation speed corresponding to the magnetic control switch by using the closing time and the closing times of the magnetic control switch, it may be considered to calculate the primary rotation speed corresponding to each magnetic control switch by using the following manner:
determining the number X of magnetic elements;
calculating the primary rotating speed corresponding to the current magnetic control switch by using the following formula I:
wherein s isijIs used for representing the primary rotating speed n of the current ith magnetic control switch in the jth time intervalijIs used for representing the number of times of closing the current ith magnetic control switch in the jth time interval, TijThe method is used for representing the closing time of the current ith magnetic control switch recorded in the jth time interval.
In the embodiment of the invention, when the primary rotating speed corresponding to each magnetic control switch is determined, the number of the magnetic elements is determined, and then the primary rotating speed corresponding to the current magnetic control switch can be accurately calculated by using a formula I.
For example, the number of the magnetic elements installed 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 control switch is 10, and the closing time is 2 seconds, then the rotation speed corresponding to the first magnetic control switch is: s1jThe value (10-1)/(3 × 2) is 1.5 rpm, i.e., the primary speed of the first magnetic control switch is 1.5 rpm in the jth time interval. Similarly, the first formula can be used for calculating the rotating speeds of the two corresponding magnetic control switches and the rotating speeds of the three corresponding magnetic control switches in other time intervals, so that the obtained rotating speeds in the time intervals can be further subjected to data processing, and a more accurate rotating speed detection result can be obtained.
In one possible implementation manner, the step 104 may be implemented by 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, as follows:
determining N time intervals and the number Y of magnetic switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in the N time intervals according to a generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating a rotation speed difference value between two adjacent primary rotation speeds to obtain a difference value queue consisting of 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 carried out on each primary rotating speed, firstly, the number of time intervals and the number of magnetic switches can be considered and determined, then the primary rotating speeds corresponding to the magnetic switches in the time intervals are arranged according to the generation sequence to obtain a rotating speed queue, 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, and therefore, the difference value queue can be used for determining the rotating speed of the inner barrel of the washing machine.
Therefore, the scheme arranges the obtained primary rotating speeds and arranges the obtained difference values, so that the state of the current washing machine can be seen from the arranged queue. For example, when there are continuous differences in the difference queue that do not vary much, then the washing machine may be in a steady state; when a negative value appears in the difference value queue and the absolute value of the negative value is larger, the washing machine may be in a rotating speed reduction stage; when the difference queue is a positive value and the value is large, the washing machine may be in a rotation speed increasing stage. Further rotational speed determinations may then be made in accordance with the various stages.
For example, when the rotation speed of the washing machine is further determined according to the difference value queue, in one possible implementation, the rotation speed may be determined by:
judging whether the absolute value deviation of two adjacent difference values in the difference value queue is smaller than a preset error or not according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein, the delta (m) is used for representing the mth difference value in the difference value queue, the delta (m-1) is used for representing the mth-1 difference value in the difference value queue, and the epsilon is used for representing a preset error;
determining a counting threshold value r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting the formula II is greater than a counting threshold value r or not;
if the number of the adjacent difference values which satisfy the second formula is not less than r, calculating the arithmetic mean value of each rotating speed which participates in the calculation of the adjacent difference values to obtain the rotating speed of the inner barrel of the washing machine;
and if the number of the adjacent difference value pairs meeting the formula II is less 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 is determined. Further, the relation between the number of the difference value pairs meeting the relation and a set counting threshold value is judged, and then the rotating speed of the inner barrel of the washing machine is determined.
For example, when the number of the difference pairs satisfying the above relationship is not less than the counting threshold, it indicates that the washing machine is in the stable rotation speed stage in this stage, and at this time, the arithmetic mean value calculation may be performed on each rotation speed involved in calculating the adjacent difference pair, so as to obtain the rotation speed of the inner tub of the washing machine. And when the number of the difference value pairs meeting the relationship is smaller than the counting threshold value, the washing machine is in a rotation number change stage, namely a rotation speed increasing stage and a rotation speed decreasing stage, and at the moment, the last rotation speed value in the rotation speed queue can be determined as the current inner barrel rotation speed of the washing machine. Therefore, according to the scheme, different running states of the washing machine are distinguished, then different determining modes of the rotating speed are adopted, particularly when the washing machine is in a stable rotating speed state, each rotating speed of the washing machine in the stable state is determined, then the average value of the rotating speeds is used as the current rotating speed, the effect of effectively reducing errors can be achieved, and therefore the accuracy of the detected rotating speed value is higher.
For example, when calculating the rotational speedThe time lengths recorded by the detection device from the three magnetic switches A, B and C are t1, t2 and t3 respectively, the closing times are n1, n2 and n3, and the rotating speeds are s1, s2 and s 3. Since the rotation speed of the washing machine is dynamically changed, it can be considered to divide the change of the rotation speed into three stages: a rotating speed rising stage, a rotating speed stabilizing stage and a rotating speed descending stage. In order to be able to determine the rotational speed in the different phases as accurately as possible, it is conceivable to provide a memory beep sequence 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, and S1N respectively indicate the rotation speed of the a magnetic control switch in the first time interval, the rotation speed of the a magnetic control switch in the second time interval, the rotation speed of the a magnetic control switch in the nth time interval, and the rotation speeds measured by the B and C magnetic control switches. Namely SYNAnd the rotating speed of the Y-th magnetic control switch measured in the Nth time interval is shown.
TABLE 1
| S11 | S21 | S31 | S12 | S22 | S32 | S13 | S23 | S33 | … | … | S1N | S2N | S3N |
Further, the difference Δ between two adjacent rotation speeds can be calculated from the above table 1, so that 3N-1 differences, Δ 1, Δ 2, … …, Δ (3N-1), can be obtained at the maximum from the above 3N rotation speed value data, as shown in the following table 2.
TABLE 2
| Δ1 | Δ2 | Δ3 | Δ4 | … | … | Δ(3N-3) | Δ(3N-2) | Δ(3N-1) |
However, under an unstable rotation speed, the measured rotation speed of different magnetic switches and magnetic elements has an error due to distribution parameters, so we can further set a preset error epsilon, and then judge the relationship between the absolute value deviation of two adjacent difference values and the preset error epsilon. When the absolute value deviation of two adjacent difference values is not greater than the preset error epsilon, the washing machine is considered to be basically in a rotating speed stabilizing stage at the moment.
When data processing is performed, the count value is incremented by 1 as long as the above 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 absolute value calculation of the error can be used as the rotating speed value of the current stable stage after arithmetic mean. For example, r is 2, and the absolute value of the error of two consecutive times is not more than epsilon, which are Δ 3, Δ 4 and Δ 5, respectively. That is, neither the absolute values of Δ 4- Δ 3 nor the absolute values of Δ 5- Δ 4 are greater than ε. And Δ 3, Δ 4 and Δ 5 are calculated from S31, S12, S22 and S32, respectively, and thus, 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 larger than epsilon or the accumulated count does not satisfy r times, the washing machine is considered to be in the rotating speed changing process at the moment, namely a rotating speed increasing stage or a rotating speed decreasing stage. The most recently enqueued speed value in the current storage queue may be used as the current speed.
As shown in fig. 2, an embodiment of the present invention further provides a rotation speed detecting apparatus for a washing machine, which may include: the device comprises a time interval determination module 201, a closed data acquisition module 202, a primary rotating speed calculation module 203 and a data processing module 204;
a time interval determination module 201, configured to determine a time interval for performing a primary rotation speed calculation on an inner tub of a washing machine;
a closed data obtaining module 202, configured to perform, for each time interval determined by the time interval determining module 201: acquiring the closing time and the closing times of at least one magnetic control switch arranged on the outer barrel of the washing machine; when a magnetic element arranged on the inner drum of the washing machine passes through the magnetic control switch, the magnetic switch is closed;
a primary rotation speed calculation 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 frequency of the magnetic control switch obtained by the closing data acquisition module 202;
and the data processing module 204 is used for performing data processing on each primary rotating speed obtained by the primary rotating speed calculating module 203 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 calculation module 203, 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, is configured to perform the following operations:
determining the number X of magnetic elements;
calculating the primary rotating speed corresponding to the current magnetic control switch by using the following formula I:
wherein s isijIs used for representing the primary rotating speed n of the current ith magnetic control switch in the jth time intervalijIs used for representing the number of times of closing the current ith magnetic control switch in the jth time interval, TijThe method is used for representing the closing time of the current ith magnetic control switch recorded in the jth time interval.
In one possible implementation, the data processing module 204, 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, is configured to perform the following operations:
determining N time intervals and the number Y of magnetic switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in the N time intervals according to a generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating a rotation speed difference value between two adjacent primary rotation speeds to obtain a difference value queue consisting of 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, when determining the inner tub rotation speed of the washing machine according to the difference value queue, is configured to perform the following operations:
judging whether the absolute value deviation of two adjacent difference values in the difference value queue is smaller than a preset error or not according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein, the delta (m) is used for representing the mth difference value in the difference value queue, the delta (m-1) is used for representing the mth-1 difference value in the difference value queue, and the epsilon is used for representing a preset error;
determining a counting threshold value r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting the formula II is greater than a counting threshold value r or not;
if the number of the adjacent difference values which satisfy the second formula is not less than r, calculating the arithmetic mean value of each rotating speed which participates in the calculation of the adjacent difference values to obtain the rotating speed of the inner barrel of the washing machine;
and if the number of the adjacent difference value pairs meeting the formula II is less 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, an embodiment of the present invention further provides a system for detecting a rotation speed of a washing machine, which may include: at least one magnetic element 301, at least one magnetic switch 302, a rotation speed detection device 303 of the washing machine according to claims 5 to 8 and a washing machine body 304;
at least one magnetic element 301 is arranged on an inner barrel of the washing machine body 304, and at least one magnetic control switch 302 is arranged on an outer barrel 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 barrel of the washing machine body 304 passes by and sending the pulse signal to a rotating speed detection device 303 of the washing machine;
and a rotating speed detection device 303 of the washing machine, which is used for detecting the rotating speed of the inner barrel of the washing machine according to the pulse signal.
In this embodiment, the rotation speed detection system of the washing machine is composed of a magnetic element 301, a magnetic switch 302, a rotation speed detection device 303, and a washing machine body 304. It is considered that the magnetic element 301 is installed on the inner tub of the washing machine body 304, the magnetic switch 302 is installed on the outer tub of the washing machine body 304, and the magnetic switch 302 is electrically connected with the rotation speed detecting device 303 of the washing machine. Thus, when the washing machine works, the rotation of the inner barrel drives the magnetic element 301 to rotate together, and the magnetic element 301 passes through the magnetic control switch 302 arranged on the outer barrel in the rotation process. The magnetic control switch 302 is closed every time the magnetic element 301 passes through the magnetic control switch 302, 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 can calculate the rotating speed of the inner barrel of the washing machine. Therefore, the scheme does not need to provide a special speed measuring component for the driving motor, and is wide in application range and easy to realize. And the rotating speed sensor is not required to be connected to the rotating shaft of the inner barrel of the washing machine for rotating speed measurement, so that the cost for detecting the rotating speed is increased, and the installation structure of the washing machine is enlarged, and the performance improvement of the washing machine is influenced.
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 signal. Therefore, the limitation that the speed needs to depend on the filtering algorithm when determining the rotating speed is avoided, and the accurate 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 installed on the outer wall of the inner tub of the washing machine body 304, and the at least one magnetic switch is uniformly installed 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 switches are uniformly mounted on the inner wall of the outer tub of the washing machine body. Therefore, the magnetic element and the magnetic control switch can be ensured to be in close contact when the washing machine works, and the trigger sensitivity of the magnetic switch can be improved. And through the even distribution, can make the data evenly distributed who gathers, the rotational speed that utilizes this kind of data calculation to obtain is more accurate.
It is understood that the structure illustrated in the embodiment of the present invention does not constitute a specific limitation to the rotation speed detecting apparatus of the washing machine. In other embodiments of the present invention, the rotation speed detecting apparatus of the washing machine may include more or less components than those shown, or combine some components, or split some components, or arrange different components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.
Because the content of information interaction, execution process, and the like among the modules in the device is based on the same concept as the method embodiment of the present invention, specific content can be referred to the description in the method embodiment of the present invention, and is not described herein again.
An embodiment of the present invention further provides a computing device, including: at least one memory and at least one processor;
at least one memory for storing a machine readable program;
at least one processor for calling a machine readable program to perform a method for detecting a rotational speed of a washing machine according to any one of the embodiments of the present invention.
Embodiments of the present invention also provide a computer-readable medium storing instructions for causing a computer to perform a rotational speed detection method of a washing machine as described herein. Specifically, a method or an apparatus equipped with a storage medium on which a software program code that realizes the functions of any of the above-described embodiments is stored may be provided, and a computer (or a CPU or MPU) of the method or the apparatus is 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 can realize the functions of any of the above-described embodiments, and thus the program code and the storage medium storing the program code constitute a part of the present invention.
Examples of the storage medium for supplying 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 via a communications network.
Further, it should be clear that the functions of any one of the above-described embodiments can be implemented not only by executing the program code read out by the computer, but also by performing a part or all of the actual operations by an operation method or the like operating on the computer based on instructions of the program code.
The foregoing description of specific embodiments of the present invention has been presented. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may 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 may also be possible or may be advantageous.
The above embodiments are only for illustrating the embodiments of the present invention and are not to be construed as limiting the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the embodiments of the present invention shall be included in the scope of the present invention.
Claims (10)
1. A method for detecting the rotation speed of a washing machine is characterized by comprising the following steps:
determining a time interval for performing primary rotating speed calculation on an inner barrel of the washing machine;
for each time interval:
acquiring the closing time and the closing times of at least one magnetic control switch arranged on the outer barrel of the washing machine; when a magnetic element arranged on the inner barrel of the washing machine passes through the magnetic control switch, the magnetic switch is closed;
aiming at each magnetic control switch, 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;
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.
2. The method of claim 1, wherein 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 comprises:
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 isijIs used for representing the primary rotating speed n of the current ith magnetic control switch in the jth time intervalijIs used for representing the number of times of closing the current ith magnetic control switch in the jth time interval, TijThe method is used for representing the closing time of the current ith magnetic control switch recorded in the jth time interval.
3. The method as claimed in claim 2, wherein the data processing of the respective primary rotation speeds obtained in at least one time interval to obtain the rotation speed of the inner tub of the washing machine comprises:
determining N of said time intervals and a number Y of said magnetic switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in the N time intervals according to a generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating a rotation speed difference value between two adjacent primary rotation speeds to obtain a difference value queue consisting of 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.
4. The method as claimed in claim 3, wherein said determining the inner tub rotation speed of the washing machine according to the difference value queue comprises:
judging whether the absolute value deviation of two adjacent difference values in the difference value queue is smaller than a preset error or not according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein, Δ (m) is used for representing the mth difference in the difference queue, Δ (m-1) is used for representing the mth-1 difference in the difference queue, and ε is used for representing the preset error;
determining a counting threshold value r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting the second formula is larger than the counting threshold r or not;
if the number of the adjacent difference value pairs meeting the second formula is not less than r, performing arithmetic mean calculation on the rotating speeds participating in the calculation of the adjacent difference value pairs to obtain the rotating speed of the inner barrel of the washing machine;
and if the number of the adjacent difference value pairs meeting the second formula is less than r, determining the last rotating speed in the rotating speed queue as the rotating speed of the inner barrel of the washing machine.
5. A rotation speed detection device of a washing machine is characterized by comprising: the device comprises a time interval determining module, a closed data acquiring module, a primary rotating speed calculating module and a data processing module;
the time interval determination module is used for determining the time interval for calculating the primary rotating speed of the inner barrel of the washing machine;
the closed data obtaining module is configured to perform, for each time interval determined by the time interval determining module: acquiring the closing time and the closing times of at least one magnetic control switch arranged on the outer barrel of the washing machine; 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 calculation module is used for calculating the primary rotating speed corresponding to each magnetic control switch by utilizing the closing time and the closing times of the magnetic control switch obtained by the closing data acquisition module;
and the data processing module is used for carrying out 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.
6. The apparatus of claim 5, wherein the primary rotation speed calculation module, 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, is configured to:
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 isijIs used for representing the primary rotating speed n of the current ith magnetic control switch in the jth time intervalijIs used for representing the number of times of closing the current ith magnetic control switch in the jth time interval, TijThe method is used for representing the closing time of the current ith magnetic control switch recorded in the jth time interval.
7. The apparatus of claim 6, wherein the data processing module, when performing data processing on each primary rpm obtained in at least one time interval to obtain the inner tub rpm of the washing machine, is configured to perform the following operations:
determining N of said time intervals and a number Y of said magnetic switches;
arranging the primary rotating speeds corresponding to the magnetic control switches in the N time intervals according to a generation sequence to obtain a rotating speed queue consisting of Y multiplied by N primary rotating speeds;
calculating a rotation speed difference value between two adjacent primary rotation speeds to obtain a difference value queue consisting of 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.
8. The apparatus of claim 7, wherein the data processing module, when determining the inner tub rotation speed of the washing machine from the difference queue, is configured to:
judging whether the absolute value deviation of two adjacent difference values in the difference value queue is smaller than a preset error or not according to the following formula II;
|Δ(m)-Δ(m-1)|≤ε
wherein, Δ (m) is used for representing the mth difference in the difference queue, Δ (m-1) is used for representing the mth-1 difference in the difference queue, and ε is used for representing the preset error;
determining a counting threshold value r of the stable rotating speed;
judging whether the number of adjacent difference value pairs meeting the second formula is larger than the counting threshold r or not;
if the number of the adjacent difference value pairs meeting the second formula is not less than r, performing arithmetic mean calculation on the rotating speeds participating in the calculation of the adjacent difference value pairs to obtain the rotating speed of the inner barrel of the washing machine;
and if the number of the adjacent difference value pairs meeting the second formula is less than r, determining the last rotating speed in the rotating speed queue as the rotating speed of the inner barrel of the washing machine.
9. A rotation speed detection system of a washing machine, characterized by comprising: at least one magnetic element, at least one magnetic control switch, the rotation speed detection device of the washing machine according to claims 5 to 8, and the washing machine body;
the 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;
and the rotating speed detection device of the washing machine is used for detecting the rotating speed of the inner barrel of the washing machine according to the pulse signal.
10. The method as claimed in claim 9, wherein the at least one magnetic element is uniformly installed on an outer wall of an inner tub of the washing machine body, and the at least one magnetic switch is uniformly installed on an inner wall of an outer tub of the washing machine body.
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