A method and system for detecting imbalance of a washing machine and a washing machine

Abstract

The application discloses a kind of washing machine imbalance detection method, detection system and washing machine, by obtaining total load weight M, load eccentric weight original value B;According to total load weight M, load eccentric weight original value B, eccentric load weight m is fitted;According to the corresponding speed threshold of eccentric load weight m;In the dehydration procedure, control motor speed does not exceed speed threshold;Therefore, the washing machine imbalance detection method of the embodiment, in the working process of washing machine, it is not necessary to divide load weight into gear, directly according to total load weight M, load eccentric weight original value B, eccentric load weight m is fitted, and the eccentric load weight m of relatively accurate is obtained, then according to the size of eccentric load weight m directly determine the speed threshold of washing machine dehydration, limit the motor speed of washing machine dehydration, solve the technical problem that the eccentric load weight of washing machine in the prior art is complex, and the eccentric load weight can be simply and accurately obtained.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of clothes processing equipment, and particularly relates to a washing machine imbalance detection method, a detection system and a washing machine. BACKGROUND

[0002] In the washing process of a drum washing machine, the weight, material, and uniformity of the clothes in the drum will have various influences on the control of the washing machine, and a good imbalance detection algorithm is crucial to more effectively control the washing machine to complete the washing task under various load conditions.

[0003] In a conventional control algorithm, the motor drive board detects the imbalance (OOB) value (original value) of the load in the drum and transmits it to the upper computer. The upper computer will limit the maximum speed of the washing machine during spinning according to the received data and the pre-set OOB value range (different OOB value ranges correspond to different maximum speeds). The smaller the OOB value, the greater the allowable maximum speed.

[0004] The disadvantage of this conventional control algorithm is that the control algorithm is rough and does not distinguish the weight of the load in the drum. The same OOB value will exhibit different degrees of imbalance when the weight of the load in the drum is different, the corresponding eccentric weight is different, and the pressure on the drum wall during drum rotation will also be different. In order to ensure the stability of the washing machine, the structural firmness of the washing machine needs to be improved, the maximum speed of the drum is reduced, the cost is increased, and the performance is reduced. That is, the control precision is low, a large design margin is required, and the structure of the whole machine is required to be high.

[0005] In order to improve the control precision, a load weight parameter is added to the control algorithm, that is, the motor drive board detects the size of the load in the drum (original value). First, the load weight is processed in high, medium and low grades (the higher the gear, the greater the load weight); in each gear state, the OOB value range is designed according to the conventional control algorithm, and the maximum speed of the washing machine during spinning is limited in each OOB value range.

[0006] The disadvantages of this general control algorithm are:

[0007] (1) Load weight grading, even if the data is uniformly processed in each load weight range, the same eccentric weight will still exhibit different imbalance (OOB) values due to different load weights in each load weight range.

[0008] (2) consistency is not good, the original value of the load weight in the washing machine cylinder is not equal to the load weight, and the original value of the imbalance (OOB) of the load in the washing machine cylinder is not equal to the eccentric weight; different washing machine models (structural differences, motor model differences, etc.) need to set the imbalance (OOB) value range in each load weight sub-range, and set the corresponding highest speed.

[0009] (3) Any measurement has errors, so near the critical point of different gears, the actual gear and the measured gear may be misaligned, which may cause over-tightening or over-loosening, which can only increase the design margin to solve the problem, which reduces the control accuracy and sacrifices the performance of the whole machine.

[0010] In the same gear, the OOB values of low weight and high weight loads still have a large deviation, and there is a large misalignment between gears, which affects the final spin-drying process control effect. SUMMARY

[0011] The washing machine imbalance detection method provided by the application solves the technical problem of complex eccentric load weight calculation in the prior art.

[0012] To achieve the above technical purpose, the following technical solutions are used in the application:

[0013] A washing machine imbalance detection method, comprising:

[0014] obtaining a total load weight M and a load eccentric weight original value B;

[0015] fitting an eccentric load weight m according to the total load weight M and the load eccentric weight original value B;

[0016] obtaining a corresponding speed threshold according to the eccentric load weight m;

[0017] In the dehydration program, the motor speed is controlled to be not more than the speed threshold.

[0018] In some embodiments of the application, the eccentric load weight m is fitted according to the total load weight M and the load eccentric weight original value B, specifically including: the eccentric load weight m is calculated according to the following formula:

[0019] m = (k1*M+b)*B+a;

[0020] Where k1, b, and a are fitting constants.

[0021] In some embodiments of the application, the calculation process of the fitting constants k1, b, and a is:

[0022] The washing machine runs a weighing detection and an eccentricity detection when the total load weight takes different values and the eccentric load weight takes different values, to obtain a load eccentric weight original value corresponding to the total load weight taking different values and the eccentric load weight taking different values; then a curve and a formula are fitted to obtain values of k1, b and a.

[0023] In some embodiments of the present application, the corresponding rotating speed threshold is obtained according to the eccentric load weight m, specifically including:

[0024] a corresponding table of preset eccentric load weight and rotating speed threshold;

[0025] According to the fitted eccentric load weight, the corresponding table is queried to obtain the corresponding rotating speed threshold.

[0026] In some embodiments of the present application, the rotating speed of the motor is controlled not to exceed the rotating speed threshold, specifically including:

[0027] When entering the dehydration program, the motor rotating speed corresponding to the selected dehydration gear is obtained;

[0028] When the corresponding motor rotating speed exceeds the rotating speed threshold, the dehydration gear is lowered until the motor rotating speed corresponding to the dehydration gear does not exceed the rotating speed threshold.

[0029] A washing machine imbalance detection system, comprising:

[0030] a weighing module for obtaining a total load weight M;

[0031] an eccentricity detection module for obtaining a load eccentric weight original value B;

[0032] an eccentric load weight obtaining module for fitting an eccentric load weight m according to the total load weight M and the load eccentric weight original value B;

[0033] a rotating speed threshold obtaining module for obtaining a corresponding rotating speed threshold according to the eccentric load weight m;

[0034] a control module for controlling the rotating speed of the motor not to exceed the rotating speed threshold in the dehydration program.

[0035] In some embodiments of the present application, the eccentric load weight obtaining module is specifically configured to calculate the eccentric load weight m according to the following formula:

[0036] m=(k1*M+b)*B+a;

[0037] wherein k1, b and a are fitting constants.

[0038] In some embodiments of the present application, the rotating speed threshold obtaining module is specifically configured to:

[0039] A preset correspondence table of eccentric load weight and rotation speed threshold value;

[0040] According to the fitted eccentric load weight, the corresponding rotation speed threshold value is obtained by querying the correspondence table.

[0041] In some embodiments of the present application, the control module is specifically used for:

[0042] When entering the dehydration procedure, the motor rotation speed corresponding to the selected dehydration gear is obtained;

[0043] When the corresponding motor rotation speed exceeds the rotation speed threshold value, the dehydration gear is lowered until the motor rotation speed corresponding to the dehydration gear does not exceed the rotation speed threshold value.

[0044] A washing machine adopting the washing machine imbalance detection method.

[0045] Compared with the prior art, the advantages and positive effects of the washing machine imbalance detection method, detection system and washing machine of the present application are as follows: the total load weight M and the load eccentric weight original value B are obtained; the eccentric load weight m is fitted according to the total load weight M and the load eccentric weight original value B; the corresponding rotation speed threshold value is obtained according to the eccentric load weight m; in the dehydration procedure, the motor rotation speed is controlled to not exceed the rotation speed threshold value; therefore, the washing machine imbalance detection method of the present embodiment does not need to divide the load weight into gears during the working process of the washing machine, directly fits the eccentric load weight m according to the total load weight M and the load eccentric weight original value B, obtains a relatively accurate eccentric load weight m, and then directly determines the rotation speed threshold value of the washing machine during dehydration according to the size of the eccentric load weight m, limits the motor rotation speed of the washing machine during dehydration, and solves the technical problem of complex calculation of the eccentric load weight of the washing machine in the prior art, so that the eccentric load weight can be simply and accurately obtained.

[0046] Other features and advantages of the present application will become more apparent after reading the detailed description of the embodiments of the present application in combination with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows, and obviously, the drawings in the following description can also be used by those skilled in the art to obtain other drawings without creative labor.

[0048] Figure 1 is a flowchart of an embodiment of the washing machine imbalance detection method proposed by the present application;

[0049] Figure 2 is Figure 1 flowchart of part of the steps in the embodiment;

[0050] Figure 3 is Figure 1 a flow chart of part of the steps;

[0051] Figure 4 is the fitted curve;

[0052] Figure 5 is a structural block diagram of an embodiment of the imbalance detection system of the washing machine. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0054] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0055] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0056] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In view of the technical problem of complex calculation of the eccentric load weight of the washing machine, the washing machine imbalance detection method, detection system and washing machine are provided, the eccentric load weight m is calculated according to the total load weight M and the load eccentric weight original value B, and then the corresponding rotation speed threshold is obtained, so that the technical problem of complex calculation of the eccentric load weight of the washing machine is solved, and the competitiveness of the washing machine is improved. Next, the washing machine imbalance detection method, detection system and washing machine of the present application will be described in detail in combination with the drawings.

[0058] The washing machine adopts the washing machine imbalance detection method of embodiment one. Specifically, the washing machine imbalance detection method of embodiment one is executed by the controller of the washing machine.

[0059] Embodiment one,

[0060] The washing machine imbalance detection method of the present embodiment mainly includes the following steps, as shown in Figure 1

[0061] Step S1: obtaining the total load weight M and the load eccentric weight original value B.

[0062] The total load weight M in the washing machine drum can be obtained through the weighing function of the washing machine. Before the washing task, the motor is briefly rotated and stopped, the reverse electromotive force generated by the motor is detected, and the size of the reverse electromotive force reflects the size of the total load weight M.

[0063] The total load weight M in the washing machine drum is collected by the motor drive board.

[0064] Moreover, the load eccentric weight original value B is also detected by the motor drive board.

[0065] Step S2: fitting the eccentric load weight m according to the total load weight M and the load eccentric weight original value B.

[0066] Step S3: obtaining the corresponding rotation speed threshold according to the eccentric load weight m.

[0067] The rotation speed threshold is the maximum rotation speed of the motor during dehydration.

[0068] This step specifically includes the following steps, as shown in Figure 2

[0069] Step S3-1: presetting the corresponding table of the eccentric load weight and the rotation speed threshold.

[0070] The eccentric load weight and the rotation speed threshold have a corresponding relationship, the smaller the eccentric load weight, the greater the rotation speed threshold. The corresponding table of the eccentric load weight and the rotation speed threshold is preset and saved.

[0071] Step S3-2: according to the fitted eccentric load weight, querying the corresponding table to obtain the corresponding rotation speed threshold.​​

[0072] By designing S3-1-S3-2, the threshold speed corresponding to the eccentric load weight can be obtained simply, directly and quickly.

[0073] Step S4: In the dehydration process, the motor speed is controlled to be not more than the threshold speed.

[0074] In this step, the following steps are included, see Figure 3 .

[0075] Step S4-1: When entering the dehydration process, the motor speed corresponding to the selected dehydration gear is obtained.

[0076] The motor speed corresponding to different dehydration gears is different.

[0077] Step S4-2: When the corresponding motor speed exceeds the threshold speed, the dehydration gear is lowered until the motor speed corresponding to the dehydration gear does not exceed the threshold speed.

[0078] When the motor speed corresponding to the selected dehydration gear exceeds the threshold speed, the dehydration gear is lowered by one gear. If the motor speed corresponding to the lowered gear still exceeds the threshold speed, the dehydration gear is continuously lowered until the motor speed corresponding to the dehydration gear does not exceed the threshold speed, and then the dehydration is started.

[0079] By designing steps S4-1-S4-2, the dehydration gear is adjusted in time so that the motor speed corresponding to the dehydration gear does not exceed the threshold speed, avoiding that the large motor speed affects the safe operation of the washing machine.

[0080] In the process of the washing machine running, the motor drive board will continuously detect the related data of the load in the drum and transmit them to the controller. The controller will transmit control instructions to the motor drive board according to the collected data according to the control process to control the motor to run.

[0081] The washing machine imbalance detection method of the embodiment obtains the total load weight M and the load eccentric weight original value B, fits the eccentric load weight m according to the total load weight M and the load eccentric weight original value B, obtains the corresponding threshold speed according to the eccentric load weight m, and controls the motor speed to be not more than the threshold speed in the dehydration process. Therefore, the washing machine imbalance detection method of the embodiment does not need to divide the load weight into gears during the working process of the washing machine, directly fits the eccentric load weight m according to the total load weight M and the load eccentric weight original value B, obtains a relatively accurate eccentric load weight m, and then directly determines the threshold speed of the washing machine during dehydration according to the size of the eccentric load weight m, limits the motor speed of the washing machine during dehydration, and solves the technical problem that the eccentric load weight of the washing machine in the prior art is complex to calculate. The eccentric load weight can be obtained simply and accurately.

[0082] In some embodiments of the application, in step S2, the eccentric load weight m is calculated according to the following formula.

[0083] m = (k1*M + b)*B + a; (5)

[0084] where k1, b, and a are fitting constants.

[0085] After obtaining the total load weight M and the load eccentric weight original value B of the washing machine using the motor drive board, the eccentric load weight m is calculated according to the above formula (5).

[0086] The above formula (5) can simply and accurately describe the relationship between the eccentric load weight m and the total load weight M and the load eccentric weight original value B. The eccentric load weight m is directly calculated using the formula, which is simple and convenient.

[0087] The derivation process of formula (5) is as follows:

[0088] In the working process of the washing machine, the greater the load weight in the drum of the washing machine, the greater the load weight original value collected by the motor drive board. When the uniform load in the drum is constant, the greater the eccentric weight, the greater the load eccentric weight original value collected by the motor drive board.

[0089] A ∝ M; (A is proportional to M) (1)

[0090] B ∝ m; (M is constant, B is proportional to m) (2)

[0091] A represents the total load weight original value, B represents the load eccentric weight original value, M represents the total load weight (including the uniform load weight and the eccentric load weight), and m represents the eccentric load weight.

[0092] When the total load weight M is constant, the eccentric load weight m can be represented as:

[0093] m = k*B + a; (3)

[0094] where k is the load eccentric weight original value coefficient, and a is a constant.

[0095] When the total load weight M changes, the value of k changes, and the change relationship is represented as:

[0096] k = (k1*M) + b; (4)

[0097] where k1 is a fitting coefficient, and b is a constant.

[0098] Substituting formula (4) into formula (3) gives:

[0099] m = ((k1*M) + b)*B + a;

[0100] That is, m = (k1*M+b)*B+a; (5)

[0101] In some embodiments of the present application, the calculation process of fitting constants k1, b, and a is as follows:

[0102] When the total load weight takes different values and the eccentric load weight takes different values (different weight eccentric blocks can be used), the washing machine runs the weighing detection and the eccentric detection to obtain the corresponding load eccentric weight original values when the total load weight takes different values and the eccentric load weight takes different values. Then, the curve and the corresponding formula are fitted according to the obtained data to obtain the values of k1, b, and a.

[0103] Through the above process, the values of constants k1, b, and a can be simply, conveniently, and accurately obtained.

[0104] For example, under experimental conditions, the following operations are performed:

[0105] When the total load weight M is the empty bucket weight, under different weights of the eccentric block, that is, the eccentric load weight m takes different values, for example, m is 200g, 400g, 600g, … , 1600g, respectively; the washing machine runs the weighing detection and the eccentric detection to test the size of the corresponding load eccentric weight original value B when M is the empty bucket weight and m takes different values. Then, the uppermost curve in formula (1) and the corresponding curve formula are fitted according to the tested data. Figure 4

[0106] When the total load weight M is 3Kg, when the eccentric load weight m takes 200g, 400g, 600g, … , 1600g, respectively; the washing machine runs the weighing detection and the eccentric detection to test the size of the corresponding load eccentric weight original value B when M is 3Kg and m takes different values. Then, the second curve in formula (2) and the corresponding curve formula are fitted according to the tested data. Figure 4

[0107] When the total load weight M is 6Kg, when the eccentric load weight m takes 200g, 400g, 600g, … , 1600g, respectively; the washing machine runs the weighing detection and the eccentric detection to test the size of the corresponding load eccentric weight original value B when M is 3Kg and m takes different values. Then, the third curve in formula (3) and the corresponding curve formula are fitted according to the tested data. Figure 4

[0108] When the total load weight M is 9Kg, when the eccentric load weight m takes 200g, 400g, 600g, … ​​​, 1600g; the washing machine running weight detection and eccentric detection, test out the corresponding load eccentric weight original value B size when M = 3Kg, m takes different values; then according to the test data fitting out the 4th curve in the formula (1) and the corresponding curve formula. Figure 4

[0109] When the total load weight M = 12Kg, when the eccentric load weight m takes 200g, 400g, 600g, … , 1600g; the washing machine running weight detection and eccentric detection, test out the corresponding load eccentric weight original value B size when M = 3Kg, m takes different values; then according to the test data fitting out the 5th curve in the formula (1) and the corresponding curve formula. Figure 4

[0110] Using the five curves and the corresponding curve formula, the values of k1, b and a can be obtained.

[0111] Therefore, M takes different values (such as empty barrel weight-3kg-6kg-9kg-12kg), and different weight eccentric blocks are selected, that is, m takes different values (200g-400g-600g-…-1600g), the washing machine running weight detection and eccentric detection process is tested to obtain the B value corresponding to different values of M and m; according to the obtained data, each curve in the formula (1) and the curve formula are fitted to obtain the formula coefficients and the values of k1, b and a. Figure 4

[0112] In the control of the drum washing machine, the unbalance (OOB) detection algorithm is a very important link. The present application proposes a new unbalance (OOB) detection algorithm suitable for the unbalance detection of the drum washing machine, so that the drum washing machine can more effectively complete the washing task under different load conditions.

[0113] The washing machine unbalance detection method of the embodiment fits the load weight original value A into the actual load weight (i.e. the total load weight M), and fits the OOB value (i.e. the load eccentric weight original value B) under different load weight positions into the OOB fitting value (i.e. the eccentric load weight m) suitable for the load range in the drum, which is convenient for the whole machine debugging, has high design precision, is applicable to modularization, has high portability and can be standardized for application in different models of drum washing machines and replacement of different computer boards. The program debugging is convenient, has high precision and modular design, and has high portability.

[0114] ​​​The washing machine imbalance detection method of the embodiment, through experimental simulation test, fits the load weighing original value A in the washing machine drum into the actual load weight value (i.e. total load weight M), and then matches and fits the eccentric load weight value with the load out-of-balance (OOB) value (i.e. load eccentric weight original value B) to obtain the OOB fitting value (i.e. eccentric load weight m). In the actual load working process of the washing machine, the load weight is not required to be divided into gears, and the maximum speed of the washing machine during spin-drying is directly limited according to the size of the OOB fitting value.

[0115] The washing machine imbalance detection method of the embodiment fits the load weighing original value A and the OOB original value (i.e. load eccentric weight original value B, which is machine language) into the total load weight M and the eccentric load weight m which are easier to read. The fitting idea of the load weighing original value A into the actual weight value (i.e. total load weight M) changes the machine language into weight which is easier to read. The load weighing original value A and the OOB original value (i.e. load eccentric weight original value B) are fitted into the total load weight M and the eccentric load weight m which have practical significance.

[0116] The washing machine imbalance detection method of the embodiment has the following technical effects:

[0117] (1) The load weighing original value and the OOB original value are fitted into the total load weight M (kilograms: KG) and the eccentric load weight m (grams: G) which have practical significance according to the proportional relationship, which is convenient for intuitive debugging and modular application of the whole machine.

[0118] (2) Different washing machine models, structures, motors and other factors will affect the size of the load weighing original value A and the OOB original value, but the output data after the fitting algorithm processing of the application is the direct eccentric load weight m, which eliminates the influence of uniform load weight and the influence of different machine structures, and can be standardized applied among different machine models.

[0119] (3) Since the output data of the fitting algorithm of the application is standardized, when the computer board of different manufacturers is replaced or upgraded, the complicated debugging process is avoided.

[0120] Embodiment two,

[0121] Based on the design of the washing machine imbalance detection method of embodiment one, embodiment two proposes a washing machine imbalance detection system, which includes a weighing module, an eccentric detection module, an eccentric load weight acquisition module, a rotation speed threshold acquisition module, a control module, etc., as shown in Figure 5 .

[0122] The weighing module is used to acquire the total load weight M;

[0123] The eccentric detection module is used to acquire the load eccentric weight original value B;

[0124] an eccentric load weight obtaining module configured to obtain an eccentric load weight m according to the total load weight M and the load eccentric weight raw value B;

[0125] a rotating speed threshold value obtaining module configured to obtain a corresponding rotating speed threshold value according to the eccentric load weight m;

[0126] a control module configured to control the rotating speed of the motor not to exceed the rotating speed threshold value in the dehydration procedure.

[0127] In some embodiments of the present application, the eccentric load weight obtaining module is specifically configured to calculate the eccentric load weight m according to the following formula:

[0128] m = (k1*M + b)*B + a;

[0129] wherein k1, b and a are fitting constants.

[0130] In some embodiments of the present application, the rotating speed threshold value obtaining module is specifically configured to:

[0131] a preset correspondence table of eccentric load weight and rotating speed threshold value;

[0132] query the correspondence table according to the obtained eccentric load weight to obtain the corresponding rotating speed threshold value.

[0133] In some embodiments of the present application, the control module is specifically configured to:

[0134] when entering the dehydration procedure, obtain the motor rotating speed corresponding to the selected dehydration gear;

[0135] when the corresponding motor rotating speed exceeds the rotating speed threshold value, reduce the dehydration gear until the motor rotating speed corresponding to the dehydration gear does not exceed the rotating speed threshold value.

[0136] The working process of the specific washing machine imbalance detection system has been described in detail in the above washing machine imbalance detection method, and will not be repeated here.

[0137] The washing machine imbalance detection system of the embodiment obtains the total load weight M and the load eccentric weight original value B, fits the eccentric load weight m according to the total load weight M and the load eccentric weight original value B, obtains the corresponding rotation speed threshold value according to the eccentric load weight m, and controls the motor rotation speed not to exceed the rotation speed threshold value in the dehydration program. Therefore, the washing machine imbalance detection method of the embodiment does not need to divide the load weight into gears during the working process of the washing machine, directly fits the eccentric load weight m according to the total load weight M and the load eccentric weight original value B, obtains the relatively accurate eccentric load weight m, then directly determines the rotation speed threshold value of the washing machine during dehydration according to the size of the eccentric load weight m, limits the motor rotation speed during dehydration of the washing machine, and solves the technical problem of complex calculation of the eccentric load weight of the washing machine in the prior art, so that the eccentric load weight can be simply and accurately obtained.

[0138] Embodiment three,

[0139] Based on the design of the washing machine imbalance detection method of embodiment one, embodiment three provides a washing machine adopting the washing machine imbalance detection method of embodiment one.

[0140] The washing machine of the embodiment refers to a drum washing machine.

[0141] The washing machine of the embodiment does not need to divide the load weight into gears during the working process, directly fits the eccentric load weight m according to the total load weight M and the load eccentric weight original value B, obtains the relatively accurate eccentric load weight m, then directly determines the rotation speed threshold value of the washing machine during dehydration according to the size of the eccentric load weight m, limits the motor rotation speed during dehydration of the washing machine, solves the technical problem of complex calculation of the eccentric load weight of the washing machine in the prior art, can simply and accurately obtain the eccentric load weight, and improves the competitiveness of the product.

[0142] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for detecting imbalance in a washing machine, characterized in that: include: Obtain the total load weight M and the original value of the load eccentricity weight B; The eccentric load weight m is fitted based on the total load weight M and the original value of the eccentric load weight B. The corresponding rotational speed threshold is obtained based on the eccentric load weight m. During the dehydration process, the motor speed is controlled to not exceed the speed threshold. The process of fitting the eccentric load weight m based on the total load weight M and the original value of the eccentric load weight B specifically includes: calculating the eccentric load weight m according to the following formula; m = (k1*M + b)*B + a; Where k1, b, and a are fitting constants; The calculation process for the fitting constants k1, b, and a is as follows: When the total load weight and the eccentric load weight take different values, the washing machine performs weighing detection and eccentricity detection to obtain the original value of the load eccentricity weight corresponding to the different values ​​of the total load weight and the different values ​​of the eccentric load weight; then, a curve and formula are fitted to obtain the values ​​of k1, b, and a.

2. The washing machine imbalance detection method according to claim 1, characterized in that: The step of obtaining the corresponding rotational speed threshold based on the eccentric load weight m specifically includes: A table showing the correspondence between preset eccentric load weight and speed threshold; Based on the fitted eccentric load weight, look up the corresponding table to obtain the corresponding rotational speed threshold.

3. The washing machine imbalance detection method according to claim 1, characterized in that: The control of the motor speed to not exceed the speed threshold specifically includes: When entering the dehydration program, obtain the motor speed corresponding to the selected dehydration level; When the corresponding motor speed exceeds the speed threshold, reduce the spin-drying level until the motor speed corresponding to the spin-drying level does not exceed the speed threshold.

4. A washing machine imbalance detection system, characterized in that: include: Weighing module, which is used to obtain the total load weight M; The eccentricity detection module is used to obtain the original value B of the load eccentricity weight; The eccentric load weight acquisition module is used to fit the eccentric load weight m based on the total load weight M and the original value of the eccentric load weight B. The speed threshold acquisition module is used to obtain the corresponding speed threshold based on the eccentric load weight m. The control module is used to control the motor speed to not exceed the speed threshold during the dehydration process; The eccentric load weight acquisition module is specifically used to: calculate the eccentric load weight m according to the following formula; m = (k1*M + b)*B + a; Where k1, b, and a are fitting constants.

5. The washing machine imbalance detection system according to claim 4, characterized in that: The speed threshold acquisition module is specifically used for: A table showing the correspondence between preset eccentric load weight and speed threshold; Based on the fitted eccentric load weight, look up the corresponding table to obtain the corresponding rotational speed threshold.

6. The washing machine imbalance detection system according to claim 4, characterized in that: The control module is specifically used for: When entering the dehydration program, obtain the motor speed corresponding to the selected dehydration level; When the corresponding motor speed exceeds the speed threshold, reduce the spin-drying level until the motor speed corresponding to the spin-drying level does not exceed the speed threshold.

7. A washing machine, characterized in that: The unbalance detection method for washing machines as described in any one of claims 1 to 3 is adopted.

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