CN110894659B - Control method and device of washing machine, machine readable storage medium and drum washing machine - Google Patents
Control method and device of washing machine, machine readable storage medium and drum washing machine Download PDFInfo
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- CN110894659B CN110894659B CN201811057272.XA CN201811057272A CN110894659B CN 110894659 B CN110894659 B CN 110894659B CN 201811057272 A CN201811057272 A CN 201811057272A CN 110894659 B CN110894659 B CN 110894659B
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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
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/08—Liquid supply or discharge arrangements
- D06F39/083—Liquid discharge or recirculation arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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Abstract
The invention discloses a control method and a control device of a washing machine, a machine readable storage medium and a drum washing machine, wherein the control method comprises the following steps: s0: detecting the vibration of the drum washing machine (100) through an eccentricity detection bridge circuit (5), wherein at least one bridge arm resistor in the eccentricity detection bridge circuit (5) is a resistance type strain gauge sensor (4); s1: acquiring a voltage signal at a bridge circuit output (51) of the eccentricity detection bridge circuit (5), the voltage signal representing a magnitude of vibration of the drum washing machine (100); s2: and determining the detection result of the clothing distribution eccentricity of the drum washing machine (100) according to the fluctuation value of the voltage signal and a preset fluctuation threshold value. The control mode of the invention is novel, can realize the stable and high-precision detection and control of the eccentricity of the washing machine, and has lower cost.
Description
Technical Field
The invention relates to the technical field of washing machines, in particular to a control method and device of a washing machine, a machine readable storage medium and a drum washing machine.
Background
In the drum washing machine, when the drum is unbalanced, the higher the rotation speed of the inverter motor, the greater the vibration and noise of the system, thereby reducing the service life of the drum washing machine.
As shown in figure 1, the drum washing machine is internally provided with a multi-degree-of-freedom suspension system, the clothes are unevenly distributed and generate eccentricity during dehydration, the internal system is in a multi-directional swinging state, the larger the eccentricity is, the higher the running rotating speed is, the larger the swinging is, and the greater the risk that a dehydration barrel of the drum washing machine collides with a box shell is. In order to ensure the safe operation of the dehydration of the drum washing machine, most of the existing drum washing machines have an eccentricity detection function. For example, the variable frequency drum washing machine generally has a load unbalance detection function, and when a load (such as a drum) is found to be unbalanced, the unbalanced state of the load can be changed by adjusting the rotating speed so as to achieve the purpose of reducing the vibration and noise of the system.
However, the eccentricity detection is mostly realized by using motor signal feedback, the method cannot accurately determine the eccentricity under the influence of the total weight of the load, and once the detection is wrong, the risk that the outer barrel of the drum washing machine collides with the box shell during the dehydration acceleration is very high.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, the present invention provides a control method and apparatus for a washing machine, a machine-readable storage medium, and a drum washing machine, which have novel control modes, can implement stable and high-precision detection and control of eccentricity of the washing machine, and are low in cost.
To achieve the above object, according to a first aspect of the present invention, there is provided a control method for a washing machine, the control method including the steps of:
s0: detecting the vibration of the drum washing machine through an eccentricity detection bridge circuit, wherein at least one bridge arm resistor in the eccentricity detection bridge circuit is a resistance type strain gauge sensor;
s1: acquiring a voltage signal of an output end of a bridge circuit of the eccentricity detection bridge circuit, wherein the voltage signal represents the vibration of the drum washing machine;
s2: and determining the eccentricity detection result of the clothes distribution eccentricity in the drum washing machine according to the fluctuation value of the voltage signal and a preset fluctuation threshold value.
Preferably, in the step S0, the resistance strain gauge sensor is disposed at the bottom of the washing machine to output a corresponding voltage signal from the bridge circuit output terminal of the eccentricity detection bridge circuit according to a resistance change of the resistance strain gauge sensor.
Preferably, in the step S1, the washing tub is kept rotating at a constant speed at a preset eccentricity detection speed V0, and the voltage signal is collected for a preset detection time period T.
Preferably, in the step S2, an average voltage amplitude difference Δ U is obtained according to the voltage amplitude difference of the voltage signal in each oscillation period, and the eccentricity detection result is obtained according to a comparison between the average voltage amplitude difference Δ U and a preset maximum voltage amplitude difference Δ Um.
Preferably, the preset maximum voltage amplitude difference Δ Um is related to the preset eccentricity detection speed V0.
Preferably, the control method further comprises the steps of:
s3: when the eccentric detection result is qualified, controlling the washing drum to continuously rotate at an accelerated speed from the preset eccentric detection speed V0 or keeping the rotating speed unchanged; and when the eccentricity detection result is not qualified, controlling the washing drum to stop rotating and restart, and returning to the step S1.
Preferably, in the step S3: when the eccentricity detection result is qualified, and
when the preset eccentric detection speed V0 is less than a preset critical detection speed V1, controlling the washing drum to accelerate to the preset critical detection speed V1;
or when the preset eccentric detection speed V0 is greater than or equal to the preset critical detection speed V1 and less than the preset rated speed V2, controlling the washing drum to accelerate to the preset rated speed V2;
or when the preset eccentric detection speed V0 is greater than the preset rated speed V2, keeping the rotating speed of the washing drum constant;
wherein the preset critical detection speed V1 is less than the preset rated speed V2, and the preset rated speed V2 is less than the maximum rotation speed of the washing tub.
Preferably, in the step S3:
when the washing tub is accelerated from the preset eccentricity sensing speed V0 to rotate at a constant speed at the preset critical sensing speed V1, the process returns to the step S1.
According to the second aspect of the present invention, there is also provided a control device for a washing machine, the control device includes an eccentricity detection module, an eccentricity detection bridge circuit and a resistance-type strain gauge sensor disposed on the drum washing machine, at least one bridge arm resistor in the eccentricity detection bridge circuit is the resistance-type strain gauge sensor, the eccentricity detection bridge circuit is configured to output a corresponding voltage signal from an output end of the bridge circuit according to a resistance change of the resistance-type strain gauge sensor, the eccentricity detection module includes:
the voltage signal acquisition unit is used for receiving the voltage signal within a preset detection time length T;
the voltage signal processing unit is used for solving an average voltage amplitude difference delta U according to the voltage amplitude difference of the received voltage signal in each oscillation period; and
and the voltage signal comparison unit is used for outputting an eccentric detection qualified signal when the average voltage amplitude difference delta U is not greater than a preset maximum voltage amplitude difference delta Um, and otherwise, outputting an eccentric detection unqualified signal.
Preferably, the control apparatus comprises a dehydration control module configured to:
controlling the washing drum to rotate at a constant speed at a preset eccentric detection speed V0 within the preset detection time T; and
when the eccentric detection qualified signal is received, controlling the washing drum to continuously rotate at an accelerated speed from the preset eccentric detection speed V0 or keeping the rotating speed unchanged;
or, when the eccentric detection disqualification signal is received, the washing drum is controlled to stop rotating and restart.
Preferably, the dehydration control module is further configured to:
when the washing drum is accelerated to rotate at a constant speed at the preset eccentric detection speed V0, the voltage signal acquisition unit is triggered to receive the voltage signal within the preset detection time T.
Preferably, the dehydration control module is further configured to: upon receiving the eccentricity detection qualified signal, and
when the preset eccentric detection speed V0 is less than a preset critical detection speed V1, controlling the washing drum to accelerate to the preset critical detection speed V1;
or, when the preset eccentric detection speed V0 is greater than or equal to the preset critical detection speed V1 and less than a preset rated speed V2, controlling the washing drum to accelerate to the preset rated speed V2;
or, when the preset eccentric detection speed V0 is greater than the preset rated speed V2, the rotating speed of the washing drum is kept constant;
wherein the preset critical detection speed V1 is less than the preset rated speed V2, and the preset rated speed V2 is less than the maximum rotation speed of the washing tub.
Preferably, the dehydration control module is further configured to:
when the washing drum is accelerated from the preset eccentric detection speed V0 to rotate at a constant speed at the preset critical detection speed V1, the voltage signal acquisition unit is triggered to receive the voltage signal within the preset detection time period T again.
According to a third aspect of the present invention, there is also provided a machine-readable storage medium having stored thereon instructions for causing a machine to perform the above-described control method for a washing machine.
According to a fourth aspect of the present invention, the present invention also provides a drum washing machine employing the control device described above.
Preferably, the drum washing machine comprises a cabinet and four feet for supporting the cabinet, and the resistance type strain gauge sensor is mounted between the cabinet and the feet.
Preferably, the resistance-type strain gauge sensor comprises a strain gauge and a substrate provided with a sensor hollow part, wherein the strain gauge is located in the sensor hollow part and a weak connection is formed between the strain gauge and the substrate.
Preferably, the drum washing machine comprises a lower reinforcing plate installed at the bottom of the box body, the lower reinforcing plate is provided with a lower reinforcing plate hollow part, the weak connection is formed between one end of the strain gauge located in the sensor hollow part and the substrate, and the other end of the strain gauge is provided with a sensor mounting hole;
the hollow area of the sensor hollow part is smaller than that of the lower reinforcing plate hollow part, and the top end of the bottom foot sequentially penetrates through the sensor mounting hole and the lower reinforcing plate hollow part to be connected to the bottom of the box body.
In the invention, a resistance type strain gauge sensor is innovatively utilized to form an eccentric detection bridge circuit, detection is carried out in a stable speed state, and the fluctuation characteristic value of an output signal of the resistance type strain gauge sensor is compared with a preset fluctuation threshold value, so that the eccentric size is accurately judged. Wherein, accurate perception cylinder is eccentric through the signal of telecommunication, and eccentric signal is difficult for receiving the interference, detects reliable and stable, and controlling means's is with low costs moreover.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of an internal suspension system of a conventional drum washing machine;
FIG. 2 is a schematic view of the assembly of the resistance strain gauge sensor at the bottom of the drum washing machine;
FIG. 3 is an exploded view of the assembly of the resistance strain gage sensor at the bottom of the drum washing machine, wherein the drum washing machine is in an inverted state to clearly show the components at the bottom of the washing machine;
FIG. 4 is a schematic plan view of a resistive strain gage sensor;
FIG. 5 illustrates a schematic diagram of a preferred embodiment eccentricity detection bridge circuit;
fig. 6 is a schematic structural diagram of a control apparatus of a washing machine in accordance with a preferred embodiment of the present invention;
fig. 7 is a flowchart of a control method of a washing machine according to a preferred embodiment of the present invention;
fig. 8 is a flowchart of a control method of a washing machine according to another preferred embodiment of the present invention;
fig. 9 is a graph illustrating an operation of a drum washing machine according to an embodiment of the present invention;
FIG. 10 is a flowchart illustrating an operation of the drum washing machine according to an embodiment of the present invention;
FIG. 11 is a graph of the voltage signal output of the eccentricity detection bridge circuit for 100 rpm hold for 10 seconds.
Description of reference numerals:
100 drum washing machine
1 case body 2 feet
3 lower reinforcing plate 4 resistance type strain gauge sensor
5 eccentricity detection bridge circuit 6 eccentricity detection module
7 dehydration control module 8 washing drum
41 strain gauge 42 sensor mounting hole
43 sensor hollow 51 bridge circuit output
61 voltage signal acquisition unit 62 voltage signal processing unit
63 voltage signal comparison unit
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like are generally described with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In the field of drum eccentricity detection and control of drum washing machines, researchers have conducted a great deal of research and development work. For example, in patent document CN200910009165.4, a displacement sensor is mounted on a damper to detect displacement during operation of the washing machine to detect the vibration amount of the washing machine; alternatively, in patent document cn201410676583.x, eccentricity detection is realized by a motor torque value. Alternatively, in patent document cn201320778139.x, three sensors, i.e., a pressure sensor, a load cell, and a tension sensor, are used to detect the system imbalance. In the various modes, the sensing is realized by a traditional acceleration sensor, a pressure sensor, a 3D sensor, a position sensor and a motor. However, the pressure sensor and the acceleration sensor need additional processing chips and circuits to convert the electrical signals into digital signals, and the digital signals are easily interfered by other external signals, so that research on signal shielding is needed, and a corresponding signal interference-free device is equipped, so that the cost is greatly increased.
Therefore, the invention provides a novel control device of the washing machine. Referring to fig. 2 to 6, the control device includes an eccentricity detection module 6, an eccentricity detection bridge circuit 5 and a resistance strain gauge sensor 4 disposed at the bottom of the drum washing machine 100, at least one bridge arm resistor in the eccentricity detection bridge circuit 5 is the resistance strain gauge sensor 4, the eccentricity detection bridge circuit 5 is configured to output a corresponding voltage signal from an output end 51 of the bridge circuit according to a resistance change of the resistance strain gauge sensor 4, and the eccentricity detection module 6 includes:
the voltage signal acquisition unit 61 is used for receiving voltage signals within a preset detection time length T;
the voltage signal processing unit 62 calculates an average voltage amplitude difference Δ U according to the voltage amplitude difference of the received voltage signal in each oscillation period; and
and the voltage signal comparison unit 63 is used for outputting an eccentric detection qualified signal when the average voltage amplitude difference delta U is not greater than the preset maximum voltage amplitude difference delta Um, and otherwise, outputting an eccentric detection unqualified signal.
The hardware used in the technical scheme of the invention is an eccentric detection bridge circuit 5 formed by a resistance type strain gauge sensor 4, the cost of the strain gauge is very low, the bridge circuit feeds back a voltage signal, the electric signal is not easily interfered by other external signals, and the signal accuracy is high.
In one embodiment shown in fig. 2 and 3, the drum washing machine 100 includes a cabinet 1 and four feet 2 for supporting the cabinet 1, and the resistance type strain gauge sensor 4 is installed between the cabinet 1 and the feet 2.
The means for realizing the eccentricity detection is an eccentricity detection bridge circuit 5 (see fig. 5) formed by the resistance strain gauge sensor 4 shown in fig. 4, and a corresponding peripheral power supply circuit, a signal amplification circuit, an AD sampling circuit, etc. (not shown), which can be integrated in the electric control system of the drum washing machine.
In fig. 5, four resistive strain gauge sensors 4 are used, but any number of 1 to 4 resistive strain gauge sensors 4 may be used, and other bridge arm portions not using the resistive strain gauge sensors 4 may be replaced with a common resistor to form the eccentricity detection bridge circuit 5.
In the invention, the fluctuation characteristic value of the output signal of the resistance strain gauge sensor 4 is compared with a preset fluctuation threshold value, so as to judge the eccentricity. At different rotational speeds, there are different fluctuation thresholds. By using the average value of a plurality of fluctuation values within the preset detection time period T as a fluctuation characterizing value and comparing with a fluctuation threshold value.
The resistive strain gage sensor 4 has a structure as shown in fig. 4, and the resistive strain gage sensor 4 includes a substrate and a strain gage 41. The substrate is provided with a sensor hollow-out portion 43 to ensure that the strain gauge 41 can deform correspondingly when stressed. The strain gauge 41 is located at the location of the sensitive beam where the deformation is large, which may be formed as a weak connection structure, thereby improving the accuracy. As shown in fig. 2 and 3, the resistance strain gauge sensor 4 is installed on the lower reinforcing plate 3 of the box 1, a rectangular hollow-out portion of the lower reinforcing plate may be disposed on the lower reinforcing plate 3, and the rectangular hollow-out area of the lower reinforcing plate hollow-out portion is smaller than the substrate area of the resistance strain gauge sensor 4, so as to ensure that the edge portion of the resistance strain gauge sensor 4 can contact with the lower reinforcing plate 3 to ensure the installation performance, and to ensure that the sensor hollow-out portion 43 on the strain gauge 41 is located in the lower reinforcing plate hollow-out portion. The manner in which the resistive strain gage sensor 4 is mounted to the lower stiffener 3 includes, but is not limited to, riveting, welding, screwing, bolting, etc. For example, when the washing machine feet are installed, the foot bolts can sequentially pass through the sensor installation holes 42 of the resistance strain gauge sensors 4 and the lower reinforcing plate hollow-out portions of the lower reinforcing plates 3 upwards and are connected to the bottom of the box body 1 in a threaded fastening mode, so that the drum washing machine is ensured to be in a stable state.
By the resistance strain gauge sensor 4 and the eccentricity detection bridge circuit 5 formed by the same, the eccentricity of the roller is accurately detected, and corresponding adjustment control is required after the judgment of whether the eccentricity is qualified or not is made. Specifically, the control device includes a dehydration control module 7, and the dehydration control module 7 is configured to:
controlling the washing drum 8 (i.e. the drum in the present embodiment) to rotate at a constant speed at a preset eccentric detection speed V0 within a preset detection time period T;
when the eccentric detection qualified signal is received, controlling the washing drum 8 to continuously accelerate from the preset eccentric detection speed V0 or keeping the rotating speed unchanged;
and when the eccentric detection unqualified signal is received, controlling the washing drum 8 to stop rotating and restart.
That is, when the eccentricity is small and qualified, the washing tub 8 can be dehydrated at the original speed or accelerated, and when the eccentricity is large, the washing tub 8 should be stopped, restarted and redone for detection.
More specifically, the dehydration control module 7 may be further configured to: upon receiving the eccentricity detection qualified signal, and
when the preset eccentric detection speed V0 is less than the preset critical detection speed V1, controlling the washing drum 8 to accelerate to the preset critical detection speed V1;
or when the preset eccentric detection speed V0 is greater than or equal to the preset critical detection speed V1 and less than the preset rated speed V2, controlling the washing drum 8 to accelerate to the preset rated speed V2;
or when the preset eccentric detection speed V0 is greater than the preset rated speed V2, the rotating speed of the washing drum 8 is kept constant;
wherein the preset critical detection speed V1 is less than the preset rated speed V2, and the preset rated speed V2 is less than the maximum rotation speed of the washing drum 8.
Wherein, the dehydration control module 7 can detect the speed and acceleration of the washing drum 8 in real time.
The dehydration control module 7 may also be configured to:
when the washing drum 8 is accelerated to rotate at a constant speed at the preset eccentric detection speed V0, the voltage signal acquisition unit 61 is controlled to receive the voltage signal within the preset detection time period T.
Alternatively, the dehydration control module 7 may be further configured to:
when the washing tub 8 is accelerated from the preset eccentricity detection speed V0 to rotate at a constant speed at the preset critical detection speed V1, the voltage signal acquisition unit 61 is controlled to receive the voltage signal within the preset detection time period T again.
The present invention also provides a control method of a washing machine, referring to fig. 7, the control method including:
s0: detecting the vibration of the drum washing machine 100 by an eccentricity detection bridge circuit 5, wherein at least one bridge arm resistor in the eccentricity detection bridge circuit 5 is a resistance type strain gauge sensor 4;
s1: acquiring a voltage signal of an output end 51 of the bridge circuit of the eccentricity detection bridge circuit 5, wherein the voltage signal represents the vibration of the drum washing machine 100;
s2: and determining the eccentricity detection result of the clothing distribution eccentricity of the drum washing machine 100 according to the fluctuation value of the voltage signal and a preset fluctuation threshold value.
Specifically, in step S0, the resistive strain gauge sensor 4 is disposed at the bottom of the drum washing machine 100 to output a corresponding voltage signal from the bridge circuit output terminal 51 of the eccentricity detection bridge circuit 5 according to the resistance change of the resistive strain gauge sensor 4.
Further, in step S1, the washing tub 8 is kept rotating at a constant speed at the preset eccentricity detection speed V0, and the voltage signal within the preset detection time period T is collected.
In addition, in step S2, an average voltage amplitude difference Δ U is obtained according to the voltage amplitude difference of the voltage signal in each oscillation period, and an eccentricity detection result is obtained according to a comparison between the average voltage amplitude difference Δ U and a preset maximum voltage amplitude difference Δ Um.
In some embodiments, the preset maximum voltage magnitude difference Δ Um is related to the preset eccentricity detection speed V0.
Further, referring to fig. 8, the control method further includes the steps of:
s3: when the eccentric detection result is qualified, controlling the washing drum 8 to continuously accelerate from the preset eccentric detection speed V0 or keeping the rotating speed unchanged; when the eccentricity detection result is not qualified, the washing drum 8 is controlled to stop and restart, and the operation returns to the step S1.
Further, in step S3: when the eccentric detection result is qualified, and
when the preset eccentric detection speed V0 is less than the preset critical detection speed V1, controlling the washing drum 8 to accelerate to the preset critical detection speed V1;
or when the preset eccentric detection speed V0 is greater than or equal to the preset critical detection speed V1 and less than the preset rated speed V2, controlling the washing drum 8 to accelerate to the preset rated speed V2;
or when the preset eccentric detection speed V0 is greater than the preset rated speed V2, the rotating speed of the washing drum 8 is kept constant;
wherein the preset critical detection speed V1 is less than the preset rated speed V2, and the preset rated speed V2 is less than the maximum rotation speed of the washing drum 8.
Further, in step S3:
when the washing tub 8 is accelerated from the preset eccentricity sensing speed V0 to a constant rotation at the preset critical sensing speed V1, the process returns to step S1.
When the eccentricity of the drum washing machine is detected, the drum washing machine can accelerate to any rotating speed within 0-600 rpm at any acceleration and maintain for any time.
Specifically, in the embodiment of fig. 9 to 11, the drum washing machine is operated at an acceleration of 10 rpm to 100 rpm and maintained at a rotation speed of 100 rpm (i.e., the preset eccentricity detection speed V0) for 10 seconds (the preset detection time period T is 10s), and the eccentricity detection is completed within the preset detection time period T of 10 seconds of the constant speed operation, as shown in fig. 9.
The signal of the signal acquisition end of the eccentric detection bridge circuit 5 formed by the resistance strain gauge sensor 4, namely the output voltage signal, is acquired within 10 seconds of maintaining the operation at the uniform speed of 100 revolutions/minute. The voltage signal output curve during 10 seconds of constant speed operation is shown in fig. 11. The suspension system of the drum washing machine has a peak value and a valley value of voltage in each oscillation period, the larger the eccentricity generated by the clothes is, the larger the difference between the peak value and the valley value is, and the eccentricity generated by the clothes is determined according to the rule. The peak value and the valley value measured by the bridge circuit in each oscillation period are differentiated, all the obtained difference values in 10 seconds are recorded as U1, U2, U3, U4, U5 and the like, an average value is obtained, namely an average voltage amplitude difference delta U is obtained, and the delta U and a safety threshold written into the main control of the drum washing machine, namely a preset maximum voltage amplitude difference delta Um are obtained (the safety threshold is measured and calibrated according to the scheme of the invention by the maximum eccentricity born by the dewatering of the drum washing machine).
Therefore, if the voltage amplitude difference is larger than the preset maximum voltage amplitude difference delta Um, the eccentricity generated by the clothes in the drum washing machine exceeds the range which can be borne by the drum washing machine at the moment, namely, a disqualified signal is generated, the washing machine stops running, and the detection is restarted. If the voltage amplitude difference is less than the preset maximum voltage amplitude difference delta Um, the eccentricity generated by the clothes in the drum washing machine is within the range which can be born by the drum washing machine at the moment, the subsequent dehydration can be carried out, and the washing machine can keep the original speed dehydration or continue to run in an accelerated manner.
Accordingly, the present invention also provides a machine-readable storage medium having instructions stored thereon for causing a machine to perform the control method of the laundry machine according to the present invention. In addition, the drum washing machine 100 according to the present invention includes the control device of the washing machine according to the present invention described above. The control device comprises the control device and adopts the same control method, so that the control device has the same advantages and is not described in detail herein.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (17)
1. A control method for a washing machine, characterized in that the control method comprises the steps of:
s0: detecting the vibration of the drum washing machine (100) through an eccentricity detection bridge circuit (5), wherein at least one bridge arm resistor in the eccentricity detection bridge circuit (5) is a resistance type strain gauge sensor (4);
s1: acquiring a voltage signal of a bridge circuit output end (51) of the eccentricity detection bridge circuit (5), wherein the voltage signal represents the vibration magnitude of the drum washing machine (100);
s2: determining an eccentricity detection result of the clothing distribution eccentricity of the drum washing machine (100) according to the fluctuation value of the voltage signal and a preset fluctuation threshold value;
in step S2, an average voltage amplitude difference Δ U is obtained according to the voltage amplitude difference of the voltage signal in each oscillation period, and the eccentricity detection result is obtained according to a comparison between the average voltage amplitude difference Δ U and a preset maximum voltage amplitude difference Δ Um.
2. The method according to claim 1, characterized in that in the step S0, the resistive strain gauge sensor (4) is arranged at the bottom of the drum washing machine (100) to output a corresponding voltage signal from the bridge circuit output terminal (51) of the eccentricity detection bridge circuit (5) according to the resistance change of the resistive strain gauge sensor (4).
3. The method according to claim 1, wherein in the step S1, the washing drum (8) of the drum washing machine (100) is kept rotating at a constant speed at a preset eccentricity detection speed V0, and the voltage signal is collected for a preset detection time period T.
4. Method according to claim 3, characterized in that said preset maximum voltage amplitude difference Δ Um is related to said preset eccentricity detection speed V0.
5. The method according to claim 3, wherein the control method further comprises the steps of:
s3: when the eccentric detection result is qualified, controlling the washing drum (8) to continuously accelerate from the preset eccentric detection speed V0 or keeping the rotating speed unchanged; and when the eccentric detection result is unqualified, controlling the washing drum (8) to stop rotating and restart, and returning to the step S1.
6. The method according to claim 5, wherein in step S3: when the eccentricity detection result is qualified, and
when the preset eccentric detection speed V0 is less than a preset critical detection speed V1, controlling the washing drum (8) to accelerate to the preset critical detection speed V1;
or when the preset eccentric detection speed V0 is greater than or equal to the preset critical detection speed V1 and less than the preset rated speed V2, controlling the washing drum (8) to accelerate to the preset rated speed V2;
or when the preset eccentric detection speed V0 is greater than the preset rated speed V2, keeping the rotating speed of the washing drum (8) constant;
wherein the preset critical detection speed V1 is less than the preset rated speed V2, and the preset rated speed V2 is less than the maximum rotating speed of the washing drum (8).
7. The method according to claim 6, wherein in step S3:
when the washing tub (8) is accelerated from the preset eccentricity sensing speed V0 to rotate at a constant speed at the preset critical sensing speed V1, the process returns to the step S1.
8. A control device of a washing machine, characterized in that the control device comprises an eccentricity detection module (6), an eccentricity detection bridge circuit (5) and a resistance-type strain gauge sensor (4) arranged on a drum washing machine (100), at least one bridge arm resistance of the eccentricity detection bridge circuit (5) is the resistance-type strain gauge sensor (4), the eccentricity detection bridge circuit (5) is used for outputting a corresponding voltage signal from a bridge circuit output end (51) according to the resistance change of the resistance-type strain gauge sensor (4), and the eccentricity detection module (6) comprises:
the voltage signal acquisition unit (61) is used for receiving the voltage signal within a preset detection time length T;
the voltage signal processing unit (62) is used for solving an average voltage amplitude difference delta U according to the voltage amplitude difference of the received voltage signal in each oscillation period; and
and the voltage signal comparison unit (63) is used for outputting an eccentric detection qualified signal when the average voltage amplitude difference delta U is not greater than a preset maximum voltage amplitude difference delta Um, and otherwise, outputting an eccentric detection unqualified signal.
9. The apparatus according to claim 8, wherein the control apparatus comprises a dehydration control module (7), the dehydration control module (7) being configured to:
controlling the washing drum (8) to rotate at a constant speed at a preset eccentric detection speed V0 within the preset detection time T; and
when the eccentric detection qualified signal is received, controlling the washing drum (8) to continuously accelerate from the preset eccentric detection speed V0 or keeping the rotating speed unchanged;
or, when the eccentric detection unqualified signal is received, the washing drum (8) is controlled to stop rotating and restart.
10. The apparatus according to claim 9, wherein the dehydration control module (7) is further configured to:
when the washing drum (8) is accelerated to rotate at the constant speed of the preset eccentric detection speed V0, the voltage signal acquisition unit (61) is triggered to receive the voltage signal within the preset detection time period T.
11. The apparatus according to claim 9, wherein the dehydration control module (7) is further configured to: upon receiving the eccentricity detection qualified signal, and
when the preset eccentric detection speed V0 is less than a preset critical detection speed V1, controlling the washing drum (8) to accelerate to the preset critical detection speed V1;
or, when the preset eccentric detection speed V0 is greater than or equal to the preset critical detection speed V1 and less than a preset rated speed V2, controlling the washing drum (8) to accelerate to the preset rated speed V2;
or, when the preset eccentric detection speed V0 is greater than the preset rated speed V2, the rotating speed of the washing drum (8) is kept constant;
wherein the preset critical detection speed V1 is less than the preset rated speed V2, and the preset rated speed V2 is less than the maximum rotating speed of the washing drum (8).
12. The apparatus according to claim 11, wherein the dehydration control module (7) is further configured to:
when the washing drum (8) accelerates from the preset eccentric detection speed V0 to rotate at the constant speed of the preset critical detection speed V1, the voltage signal acquisition unit (61) is triggered to receive the voltage signal within the preset detection time period T again.
13. A machine-readable storage medium having stored thereon instructions for causing a machine to execute the control method for a washing machine according to any one of claims 1 to 7.
14. A drum washing machine, characterized in that the drum washing machine (100) comprises a control device of the washing machine according to any one of claims 8 to 12.
15. A drum washing machine according to claim 14, characterized in that the drum washing machine (100) comprises a cabinet (1) and four feet (2) for supporting the cabinet (1), the resistive strain gauge sensor (4) being mounted between the cabinet (1) and the feet (2).
16. A drum washing machine according to claim 15, characterized in that the resistive strain gauge sensor (4) comprises a strain gauge (41) and a substrate provided with a sensor cutout (43), the strain gauge (41) being located in the sensor cutout (43) and the strain gauge (41) forming a weak connection with the substrate.
17. A drum washing machine according to claim 16, characterized in that the drum washing machine (100) comprises a lower reinforcement plate (3) mounted at the bottom of the cabinet (1), the lower reinforcement plate (3) is provided with a lower reinforcement plate hollow, the weak connection is formed between one end of the strain gauge (41) in the sensor hollow (43) and the base plate and the other end is provided with a sensor mounting hole (42);
the hollowed-out area of the sensor hollowed-out part (43) is smaller than that of the lower reinforcing plate hollowed-out part, and the top end of the bottom foot (2) sequentially penetrates through the sensor mounting hole (42) and the lower reinforcing plate hollowed-out part to be connected to the bottom of the box body (1).
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| CN2773130Y (en) * | 2003-04-28 | 2006-04-19 | 美国艾默生电气公司 | System for inspecting load out off balance of washer |
| CN100519882C (en) * | 2004-06-28 | 2009-07-29 | 乐金电子(天津)电器有限公司 | Control method for dewatering of drum washing machine |
| CN102888736B (en) * | 2012-05-31 | 2014-12-03 | 青岛澳柯玛洗衣机有限公司 | Device and method for detecting dehydration imbalance of drum washing machine |
| CN103306101A (en) * | 2013-06-14 | 2013-09-18 | 无锡小天鹅股份有限公司 | Washing machine provided with suspension system |
| WO2016050436A1 (en) * | 2014-10-02 | 2016-04-07 | Arcelik Anonim Sirketi | A heat pump laundry dryer |
| JP2016083317A (en) * | 2014-10-29 | 2016-05-19 | 株式会社東芝 | Washing machine |
| JP6681227B2 (en) * | 2016-03-11 | 2020-04-15 | 東芝ライフスタイル株式会社 | Motor drive system and washing machine |
| CN106637823B (en) * | 2016-12-13 | 2019-03-15 | 广东威灵电机制造有限公司 | Washing machine and its dehydration controlling method and device |
| CN207633044U (en) * | 2017-12-12 | 2018-07-20 | 江苏新安电器有限公司 | Washing machine with Real-time Balancing detection function |
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