CN110965259A - Water level detection control method for clothes washing equipment and clothes washing equipment - Google Patents
Water level detection control method for clothes washing equipment and clothes washing equipment Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 354
- 238000001514 detection method Methods 0.000 title claims abstract description 154
- 238000005406 washing Methods 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000010412 laundry washing Methods 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 6
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- 238000002474 experimental method Methods 0.000 description 3
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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
- D06F39/087—Water level measuring or regulating devices
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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
- D06F39/088—Liquid supply arrangements
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Abstract
The invention relates to the technical field of clothes washing, and particularly provides a water level detection control method for clothes washing equipment and the clothes washing equipment, aiming at solving the problem that the existing clothes washing equipment cannot accurately detect the water level in a washing barrel. To this end, the laundry washing apparatus of the present invention includes a washing tub, a water level detecting member, and an ultrasonic device; the control method comprises the following steps: under the condition that the clothes washing equipment is in a water filling mode, acquiring the propagation time of an ultrasonic wave device for transmitting an ultrasonic wave signal to the water surface in the water level detection member and receiving the ultrasonic wave signal reflected by the water surface in the water level detection member; acquiring the temperature in the water level detection component; correcting the propagation speed of the ultrasonic waves in the water level detection member according to the temperature; and judging the water level in the washing tub according to the corrected propagation speed and propagation time. The invention corrects the transmission speed of the ultrasonic wave in the water level detection component according to the specific working condition so as to accurately judge the water level in the washing barrel.
Description
Technical Field
The invention relates to the technical field of clothes washing, and particularly provides a water level detection control method for clothes washing equipment and the clothes washing equipment.
Background
With the progress of science and technology, the automation level of human life is higher and higher, and daily housework is gradually replaced by machines from manpower. The clothes washing equipment is used as a common household appliance in daily life, and brings great convenience to the life of people. Laundry washing apparatuses are classified according to washing methods, and may be roughly classified into pulsator washing machines and drum washing machines. In the prior art, a washing machine detects the water level in a washing tub through a capacitive liquid level sensor, wherein the capacitive liquid level sensor has the detection principle of detecting the water pressure in the washing tub, the water pressure pushes a magnetic core in an indirect capacitive liquid level sensor to change the position of the magnetic core in a coil, so that the inductance value is changed, signals with different frequencies are generated through an LC oscillating circuit, and the water level in the washing tub is determined according to the corresponding relation between the frequency signal value and the water level. In the detection process, because the signal output by the indirect capacitance liquid level sensor is in nonlinear change, the input and output signals are stable only under a certain pressure, so that the detection result of the capacitance liquid level sensor is inaccurate, and the water level in the washing barrel cannot be accurately detected.
In order to solve the above problems, in the prior art, an ultrasonic water level detection device is disposed on an outer tub cover of a washing machine, and a distance between the ultrasonic water level detection device and a water surface in a washing tub is estimated by using a principle that ultrasonic waves are reflected after encountering an obstacle, so as to determine a water level in the washing tub. However, the existing water level detection method does not consider the influence of temperature on the propagation speed of ultrasonic waves, cannot accurately detect the water level in the washing tub, is difficult to meet the requirement of a user on the water level detection precision, and greatly influences the use experience of the user.
Therefore, there is a need in the art for a new water level detection control method for a laundry washing appliance and a laundry washing appliance to solve the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the existing laundry apparatus cannot accurately detect the water level in the washing tub, the present invention provides a water level detection control method for a laundry apparatus, the laundry apparatus includes a washing tub and a water level detection member communicated with the washing tub, the laundry apparatus further includes an ultrasonic device disposed in the water level detection member; the water level detection control method comprises the following steps: under the condition that the clothes washing equipment is in a water filling mode, acquiring the propagation time of an ultrasonic wave device for transmitting an ultrasonic wave signal to the water surface in the water level detection member and receiving the ultrasonic wave signal reflected by the water surface in the water level detection member; acquiring the temperature in the water level detection component; correcting the propagation speed of the ultrasonic waves in the water level detection member according to the temperature; and judging the water level in the washing tub according to the corrected propagation speed and propagation time.
In a preferred embodiment of the above water level detection control method, the step of "correcting the propagation speed of the ultrasonic wave in the water level detection member according to the temperature" includes: the propagation velocity is corrected according to the following formula: v ═ a + b × T, where V is propagation velocity, T is temperature, a is a first correction coefficient, and b is a second correction coefficient; and wherein the magnitudes of the first correction coefficient a and the second correction coefficient b depend on the propagation medium of the ultrasonic wave.
In a preferred embodiment of the above water level detection control method, when the propagation medium is air, the first correction coefficient a is 331.5, and the second correction coefficient b is 0.6.
In a preferred embodiment of the above water level detection control method, the step of "determining the water level in the washing tub based on the corrected propagation speed and propagation time" includes: determining a distance between the ultrasonic device and the water surface in the water level detection member according to the corrected propagation speed and propagation time; determining the water level according to the distance and a preset distance threshold; wherein the preset distance threshold is a distance between the ultrasonic device and the bottom of the water level detection member.
In a preferred embodiment of the above water level detection control method, after the step of "determining the water level in the washing tub based on the corrected propagation speed and propagation time", the water level detection control method further includes: and judging whether to close the water filling mode of the clothes washing equipment or not according to the water level.
In a preferred embodiment of the above water level detection control method, the step of determining whether to turn off the water filling mode of the laundry device according to the water level specifically includes: judging whether the water level reaches a preset water level threshold value or not; and if the water level reaches the preset water level threshold value, closing the water injection mode of the clothes washing equipment and stopping the operation of the ultrasonic device.
In a preferred embodiment of the above water level detection control method, the step of determining whether to quit the water level detection mode of the laundry device according to the water level further comprises: if the water level does not reach the preset water level threshold, the laundry washing apparatus maintains the water filling mode.
In a preferred embodiment of the above water level detecting and controlling method, the washing tub comprises an outer tub and an inner tub rotatably disposed in the outer tub; the water level detecting member includes a condensation passage communicated with the outer tub, and the ultrasonic device is disposed in the condensation passage.
Furthermore, the present invention also provides a laundry washing apparatus including a washing tub and a water level detecting member communicated with the washing tub, the laundry washing apparatus further including: an ultrasonic device for transmitting an ultrasonic signal to the water surface in the water level detection member and receiving an ultrasonic signal reflected back from the water surface in the water level detection member; a timing device for detecting the propagation time of the ultrasonic signal emitted from the ultrasonic device to the water surface in the water level detection member and received by the ultrasonic device reflected from the water surface in the water level detection member; temperature detection means for detecting a temperature inside the water level detection member; a speed correction module for correcting the propagation speed of the ultrasonic wave in the water level detection member according to the temperature detected by the temperature detection means; and a control module for judging the water level in the washing tub based on the corrected propagation speed and the propagation time detected by the timing device.
In a preferred embodiment of the above laundry washing machine, the ultrasonic device comprises: a first ultrasonic module for emitting an ultrasonic signal to a water surface within the water level detection member; and the second ultrasonic module is used for receiving the ultrasonic signal reflected by the water surface in the water level detection component.
As can be understood by those skilled in the art, in a preferred embodiment of the control method of the present invention, in case that the washing machine is in the water filling mode, the propagation speed of the ultrasonic waves in the water level detection member is corrected according to the temperature in the water level detection member; and judging the water level in the washing tub according to the corrected propagation speed and the propagation time of the ultrasonic device for transmitting the ultrasonic signal to the water surface in the water level detection member and receiving the ultrasonic signal reflected by the water surface in the water level detection member. Compared with the prior technical scheme that the water level in the washing tub is judged through the preset propagation speed of the ultrasonic waves in the water level detection member, the propagation speed of the ultrasonic waves in the water level detection member is corrected through the detected temperature in the water level detection member in the process of judging the water level in the washing tub, the influence of the temperature in the water level detection member on the propagation speed of the ultrasonic waves in the water level detection member is reduced, the water level in the washing tub can be accurately judged, the water injection mode can be accurately controlled to be closed, the condition that the water in the washing tub does not reach the preset water level threshold value and the water injection mode is closed in advance or the condition that the water in the washing tub exceeds the preset water level threshold value and the water injection mode is not closed is avoided, the washing effect of the washing machine is improved, and the use experience of a user is improved.
Further, in order to be able to determine the propagation velocity of the ultrasonic wave more accurately, the propagation velocity is corrected according to the following formula: v ═ a + b × T, where V is propagation velocity, T is temperature, a is a first correction coefficient, and b is a second correction coefficient; and wherein, the magnitude of the first correction coefficient a and the second correction coefficient b depends on the propagation medium of the ultrasonic wave, that is, in the course of calculating the propagation speed of the ultrasonic wave, since the propagation speed of the ultrasonic wave is related to the temperature of the propagation medium of the ultrasonic wave, the propagation speed of the ultrasonic wave is calculated according to the temperature in the water level detection member, it is possible to accurately determine the propagation speed of the ultrasonic wave, and thus to accurately determine whether to turn off the washing machine in the water injection mode, further avoiding the situation that the water in the washing tub does not reach the preset water level threshold value and the water injection mode has been turned off in advance, or the situation that the water in the washing tub has exceeded the preset water level threshold value and the water injection mode has not been turned off, and improving the washing effect of the.
Drawings
The water level detection control method and the laundry washing apparatus of the present invention will be described with reference to the accompanying drawings in conjunction with a washing machine. In the drawings:
FIG. 1 is a flow chart of a water level detection control method of the present invention;
FIG. 2 is a flow chart of a water level detection control method according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a washing machine of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the present application has been described in connection with a washing machine, the technical solution of the present invention is not limited thereto, and the control method can be obviously applied to other laundry washing apparatuses such as a shoe washing machine, a washing and drying machine, etc., without departing from the principle and scope of the present invention.
It should be noted that the terms "first" and "second" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Based on the technical problems proposed in the background art, the invention provides a water level detection control method for a washing machine and the washing machine, which aim to correct the propagation speed of ultrasonic waves in a water level detection member according to the temperature in the water level detection member, reduce the influence of the temperature in the water level detection member on the propagation speed of the ultrasonic waves in the water level detection member, and accurately judge the water level in a washing tub, so that the closing of a water injection mode can be accurately controlled, and the condition that the water in the washing tub does not reach a preset water level threshold value and the water injection mode is closed in advance or the condition that the water in the washing tub exceeds the preset water level threshold value and the water injection mode is not closed is avoided, so that the washing effect of the washing machine is improved, and the use experience of a user is improved.
Referring to fig. 1 to 3, fig. 1 is a flowchart of a water level detection control method of the present invention; FIG. 2 is a flow chart of a water level detection control method according to an embodiment of the present invention; fig. 3 is a schematic structural view of a washing machine of the present invention. As shown in fig. 1, the water level detection control method of the present invention includes the steps of:
s1, acquiring the propagation time of the ultrasonic wave device transmitting ultrasonic wave signals to the water surface in the water level detection member and receiving the ultrasonic wave signals reflected by the water surface in the water level detection member under the condition that the washing machine is in the water filling mode;
s2, acquiring the temperature in the water level detection component;
s3, correcting the propagation speed of the ultrasonic wave in the water level detection member according to the temperature;
and S4, judging the water level in the washing barrel according to the corrected propagation speed and propagation time.
Preferably, the temperature inside the water level detection member is an average temperature inside the water level detection member measured during a propagation time from when the ultrasonic device starts transmitting the ultrasonic signal to the water surface inside the water level detection member to when the ultrasonic signal reflected back from the water surface inside the water level detection member is received. Of course, the temperature in the water level detection member is not limited to the above-mentioned temperature, and may be other temperatures, for example, the highest temperature or the lowest temperature in the water level detection member in the above-mentioned propagation time, and any temperature value may be adopted as long as the propagation velocity of the ultrasonic wave in the water level detection member can be accurately corrected.
Preferably, in the process of acquiring the propagation time and acquiring the temperature inside the water level detection member, the propagation time may be acquired first, and then the temperature inside the water level detection member may be acquired; or the temperature in the water level detection component can be obtained first, and then the propagation time can be obtained; it is also possible to simultaneously acquire the propagation time and the temperature inside the water level detection member, and those skilled in the art can flexibly adjust and set the acquisition sequence of the propagation time and the temperature inside the water level detection member in practical applications without departing from the principle and scope of the present invention.
In a preferred embodiment, the step of "correcting the propagation speed of the ultrasonic wave in the water level detection member according to the temperature" in the step S3 specifically includes: the propagation velocity is corrected according to the following formula:
V＝a+b×T
wherein, V: a propagation speed;
t: (ii) temperature;
a: a first correction coefficient;
b: a second correction factor.
Wherein the magnitude of the first correction coefficient a and the second correction coefficient b depends on the propagation medium of the ultrasonic wave.
Preferably, when the propagation medium is air, the first correction coefficient a is 331.5 and the second correction coefficient b is 0.6. Of course, the propagation medium is not limited to the above-mentioned ones, and may be other propagation media such as liquid or solid, and such propagation media may be changed without departing from the principle and scope of the present invention.
In the process of calculating the propagation speed of the ultrasonic wave, the propagation speed of the ultrasonic wave is related to the temperature of the ultrasonic wave propagation medium, and the propagation speed of the ultrasonic wave is calculated according to the temperature in the water level detection member, so that the propagation speed of the ultrasonic wave can be accurately determined, whether the water injection mode of the washing machine is closed or not can be accurately judged, the condition that the water in the washing tub does not reach the preset water level threshold value and the water injection mode is closed in advance or the condition that the water in the washing tub exceeds the preset water level threshold value and the water injection mode is not closed is further avoided, and the washing effect of the washing machine is improved.
Further, after the water level detection is completed each time, the result of the ultrasonic wave propagation speed calculated by the above formula is cleared, and if the water level detection needs to be performed again, the ultrasonic wave propagation speed is recalculated.
In a preferred embodiment, the step of "determining the water level in the washing tub according to the corrected propagation speed and propagation time" in the step S4 specifically includes:
s41, determining the distance between the ultrasonic device and the water surface in the water level detection member according to the corrected propagation speed and propagation time;
and S42, determining the water level according to the distance and the preset distance threshold.
Wherein the preset distance threshold is a distance between the ultrasonic device and the bottom of the water level detection member. Of course, the preset distance threshold may also be another distance, for example, the distance between the ultrasonic device and the bottom of the washing tub, or an experimental distance obtained by a person skilled in the art according to an experiment under a specific working condition, or an empirical distance obtained according to an experience, as long as the requirement that whether the water level in the washing tub meets the washing requirement can be met by meeting the boundary point determined by the preset distance threshold.
Preferably, in step S41, a propagation distance of the ultrasonic wave is calculated from the propagation speed and the propagation time corrected in step S3, and half of the propagation distance of the ultrasonic wave is the distance between the ultrasonic device and the water surface inside the water level detection member.
Preferably, in step S42, when the bottom of the water level detection member and the bottom of the washing tub are at the same level, the highest point of the water level in the water level detection member and the highest point of the water level in the washing tub are at the same level, and the lowest point of the water level in the water level detection member and the lowest point of the water level in the washing tub are also at the same level, at this time, the difference between the preset distance threshold and the distance determined in step S41 is the water level in the washing tub; when the bottom of the water level detection member is located above the bottom of the washing tub, the highest point of the water level in the water level detection member and the highest point of the water level in the washing tub are at the same level, but the lowest point of the water level in the water level detection member is located above the lowest point of the water level in the washing tub, at this time, the sum of the difference between the preset distance threshold and the distance determined in step S41 and the difference between the bottom of the water level detection member and the bottom of the washing tub is the water level in the washing tub; when the bottom of the water level detecting member is located below the bottom of the washing tub, the highest point of the water level in the water level detecting member and the highest point of the water level in the washing tub are at the same level, but the lowest point of the water level in the water level detecting member is located below the lowest point of the water level in the washing tub, and at this time, the difference between the preset distance threshold and the distance determined in step S41 and the difference between the bottom of the water level detecting member and the bottom of the washing tub is the water level in the washing tub. Wherein, the water level in the washing barrel is the distance from the highest point of the water level in the washing barrel to the bottom of the washing barrel.
In a preferred embodiment, after the step of "determining the water level in the washing tub according to the corrected propagation speed and propagation time" at step S4, the water level detection control method further includes:
and S5, judging whether to close the water filling mode according to the water level.
Preferably, the step of determining whether to turn off the water filling mode of the washing machine according to the water level in the step S5 includes:
s51, judging whether the water level reaches a preset water level threshold value;
s52, if the water level reaches the preset water level threshold, closing the washing machine in a water injection mode, and stopping the operation of the ultrasonic device;
and S53, if the water level does not reach the preset water level threshold value, maintaining the washing machine in the water filling mode.
Specifically, in step S52, if the water level reaches the preset water level threshold, which indicates that the water level in the washing tub is high enough to satisfy the washing requirement, and the water does not need to be continuously filled into the washing tub, the washing machine is turned off from the water filling mode, and the operation of the ultrasonic device is stopped.
Further, in step S53, if the water level does not reach the preset water level threshold, it indicates that the water level in the washing tub meets the bottom, and the washing requirement is not met, the washing machine needs to continue to fill water into the washing tub, and detect the water level in the washing tub again, so that the washing machine maintains the water filling mode and repeats steps S1 to S52 until the water level in the washing tub reaches the preset water level threshold.
In the above process, a conclusion is given whether the washing machine is in the water filling mode or not by setting the preset water level threshold. The preset water level threshold value can be a water level set by a user according to the washing requirement of clothes, and can also be a water level set by a washing program according to the material and the weight of the washed objects. Of course, the preset water level threshold is not limited to the above-mentioned water levels, and may be other water levels, such as an experimental water level obtained by a person skilled in the art according to an experiment under a specific working condition, or an empirical water level obtained according to an experiment, as long as a boundary point determined by the preset water level threshold is satisfied to meet a requirement for determining whether the washing machine is turned off in the water filling mode.
Preferably, the washing tub includes an outer tub and an inner tub rotatably disposed within the outer tub.
Preferably, the water level detecting member includes a condensation passage communicating with the outer tub, and the ultrasonic device is disposed in the condensation passage.
Referring now to fig. 2, fig. 2 is a flow chart of a water level detection control method according to an embodiment of the present invention.
As shown in fig. 2, in one possible embodiment, the flow of the water level detection control method of the washing machine of the present invention may be:
s1, acquiring the propagation time of the ultrasonic wave device transmitting ultrasonic wave signals to the water surface in the water level detection member and receiving the ultrasonic wave signals reflected by the water surface in the water level detection member under the condition that the washing machine is in the water filling mode;
s2, acquiring the temperature in the water level detection component;
s3, correcting the propagation speed of the ultrasonic wave in the water level detection member according to the temperature;
s41, determining the distance between the ultrasonic device and the water surface in the water level detection member according to the corrected propagation speed and propagation time;
s42, determining the water level according to the distance and a preset distance threshold;
s51, judging whether the water level reaches a preset water level threshold value;
s52, if yes, the washing machine is closed to a water injection mode, and the ultrasonic device stops running;
and S53, if not, keeping the washing machine in the water filling mode.
The step S52 or S53 is deleted in the above water level detection control method, which can still be performed without including the step S52 or S53, and this change does not deviate from the principle and scope of the present invention.
It should be noted that the above-mentioned embodiment is only a preferred embodiment of the present invention, and is only used for illustrating the principle of the method of the present invention, and is not intended to limit the protection scope of the present invention, and in practical applications, those skilled in the art can implement the above-mentioned function allocation by different steps, i.e. re-dividing or combining the steps in the embodiment of the present invention, as required. For example, the steps of the above embodiments may be combined into one step, or further divided into multiple sub-steps to complete all or part of the functions described above. For the names of the steps involved in the embodiments of the present invention, they are only for distinguishing the respective steps, and are not to be construed as limiting the present invention.
In another aspect, the present invention also provides a washing machine, as shown in fig. 3, including a housing 1, a washing tub 2 disposed inside the housing 1, a water level detection member 3 communicating with the washing tub 2, an ultrasonic device 4, a timing device (not shown in the figure), a temperature detection device 5, a speed correction module (not shown in the figure), and a control module (not shown in the figure); wherein the ultrasonic device 4 is arranged in the water level detection member 3 and is used for transmitting ultrasonic signals to the water surface in the water level detection member 3 and receiving the ultrasonic signals reflected by the water surface in the water level detection member 3; a timing device is arranged on the ultrasonic device 4 and is used for detecting the propagation time of the ultrasonic signal transmitted by the ultrasonic device 4 to the water surface in the water level detection member 3 and received by the ultrasonic signal reflected by the water surface in the water level detection member 3; a temperature detection means 5 is provided on the ultrasonic device 4 for detecting the temperature inside the water level detection member 3; a speed correction module is provided on the control module for correcting the propagation speed of the ultrasonic waves in the water level detection member 3 according to the temperature detected by the temperature detection device 5; a control module is provided on the casing 1 which determines the water level inside the washing tub 2 based on the corrected propagation speed and the propagation time detected by the timing device. Of course, the actual installation positions of the ultrasonic device 4, the timing device, the temperature detection device 5, the speed correction module and the control module are not limited to the above-mentioned examples, and those skilled in the art can flexibly adjust and set the actual installation positions of the ultrasonic device 4, the timing device, the temperature detection device 5, the speed correction module and the control module in practical applications as long as the water level in the washing tub 2 can be accurately judged by the mutual cooperation of the ultrasonic device 4, the timing device, the temperature detection device 5, the speed correction module and the control module. Of course, the speed correction module and the control module may be two separate modules or one module, and those skilled in the art can flexibly adjust and set the setting modes of the speed correction module and the control module in practical applications.
Preferably, the washing tub 2 includes an outer tub and an inner tub rotatably disposed inside the outer tub.
Preferably, the water level detecting member 3 includes a condensing channel communicated with the outer tub, and the ultrasonic device 4 is disposed in the condensing channel, so that the water level in the washing tub 2 can be detected by using the existing condensing channel, and a member for detecting the water level is not required to be disposed, thereby saving the cost. Of course, the water level detecting member 3 may be a hose communicating with the outer tub, or another structure communicating with the outer tub, whichever structure is adopted, as long as the water level in the washing tub 2 can be accurately detected.
Preferably, the ultrasonic device 4 comprises a first ultrasonic module 41 and a second ultrasonic module 42, the first ultrasonic module 41 is used for transmitting ultrasonic signals to the water surface in the water level detection member 3, and the second ultrasonic module 42 is used for receiving the ultrasonic signals reflected by the water surface in the water level detection member 3.
Preferably, the timing means and temperature detecting means 5 may be an infrared sensor, but also other types of sensors, such as a radio frequency sensor, etc., in order to detect the propagation time of the ultrasonic wave device 4 transmitting an ultrasonic wave signal to the water surface inside the water level detecting member 3 and receiving an ultrasonic wave signal reflected back to the water surface inside the water level detecting member 3, and the temperature inside the water level detecting member 3. It should be noted that the detection method of time and temperature should not limit the present invention.
Preferably, the speed correction module corrects the propagation speed of the ultrasonic waves in the water level detection member 3 according to the temperature through computer software design, and the corrected propagation speed data is provided to the control module.
Preferably, the control module is capable of recognizing the temperature detected by the temperature detecting means 5 and the propagation time detected by the timing means, controlling the correction module to correct the propagation speed of the ultrasonic waves in the water level detecting member 3 according to the detected temperature, and determining whether to turn off the water filling mode of the washing machine according to the detected water level. The control module may be a control module of the washing machine itself, or may be an additional control module or other mobile terminals, which are not described herein again.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A water level detection control method for a laundry washing apparatus comprising a washing tub and a water level detection member communicating with said washing tub, characterized in that said laundry washing apparatus further comprises an ultrasonic device disposed within said water level detection member;
the water level detection control method comprises the following steps:
acquiring the propagation time of the ultrasonic wave device for transmitting an ultrasonic wave signal to the water surface in the water level detection member and receiving the ultrasonic wave signal reflected back by the water surface in the water level detection member under the condition that the clothes washing equipment is in a water filling mode;
acquiring the temperature in the water level detection member;
correcting a propagation speed of the ultrasonic wave in the water level detection member according to the temperature;
and judging the water level in the washing tub according to the corrected propagation speed and the propagation time.
2. The water level detection control method according to claim 1, wherein the step of "correcting the propagation speed of the ultrasonic wave in the water level detection member according to the temperature" specifically includes:
the propagation velocity is corrected according to the following formula:
V＝a+b×T
wherein V is the propagation velocity, T is the temperature, a is a first correction coefficient, and b is a second correction coefficient; and is
Wherein the magnitude of the first correction coefficient a and the second correction coefficient b depends on a propagation medium of the ultrasonic wave.
3. The water level detection control method according to claim 2, wherein when the propagation medium is air, the first correction coefficient a is 331.5 and the second correction coefficient b is 0.6.
4. The water level detection control method according to claim 1, wherein the step of determining the water level in the washing tub based on the corrected propagation speed and the propagation time includes:
determining a distance between the ultrasonic device and a water surface within the water level detection member according to the corrected propagation speed and the propagation time;
determining the water level according to the distance and a preset distance threshold;
wherein the preset distance threshold is a distance between the ultrasonic device and a bottom of the water level detection member.
5. The water level detection control method according to any one of claims 1 to 4, further comprising, after the step of "determining the water level in the washing tub from the corrected propagation speed and the propagation time", the step of:
and judging whether to enable the clothes washing equipment to close a water filling mode or not according to the water level.
6. The water level detection control method according to claim 5, wherein the step of determining whether to turn off the water filling mode of the laundry washing device according to the water level specifically comprises:
judging whether the water level reaches a preset water level threshold value or not;
and if the water level reaches the preset water level threshold value, closing the water injection mode of the clothes washing equipment and stopping the operation of the ultrasonic device.
7. The water level detection control method according to claim 6, wherein the step of determining whether to cause the laundry washing appliance to exit the water level detection mode according to the water level further comprises:
if the water level does not reach the preset water level threshold, maintaining the water filling mode of the clothes washing equipment.
8. The water level detection control method as claimed in claim 1, wherein the washing tub includes an outer tub and an inner tub rotatably provided in the outer tub;
the water level detecting member includes a condensation passage communicating with the outer tub, and the ultrasonic device is disposed in the condensation passage.
9. A laundry washing apparatus comprising a washing tub and a water level detection member communicating with the washing tub, characterized in that it further comprises:
an ultrasonic device for transmitting an ultrasonic signal to the water surface inside the water level detection member and receiving an ultrasonic signal reflected back from the water surface inside the water level detection member;
a timing device for detecting a propagation time of the ultrasonic wave device transmitting an ultrasonic wave signal to the water surface in the water level detection member and receiving an ultrasonic wave signal reflected back to the water surface in the water level detection member;
temperature detection means for detecting a temperature inside the water level detection member;
a speed correction module for correcting a propagation speed of the ultrasonic wave in the water level detection member according to the temperature detected by the temperature detection means;
a control module which judges the water level in the washing tub based on the corrected propagation speed and the propagation time detected by the timing device.
10. Laundry washing apparatus according to claim 9, characterized in that the ultrasonic device comprises:
a first ultrasonic module for emitting an ultrasonic signal to a water surface within the water level detection member;
a second ultrasonic module for receiving ultrasonic signals reflected back from the water surface within the water level detection member.
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| CN201811156167.1A CN110965259A (en) | 2018-09-30 | 2018-09-30 | Water level detection control method for clothes washing equipment and clothes washing equipment |
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