CN116122002A - Method for detecting foam of washing machine and washing machine for detecting foam by using the same - Google Patents
Method for detecting foam of washing machine and washing machine for detecting foam by using the same Download PDFInfo
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- CN116122002A CN116122002A CN202111345366.9A CN202111345366A CN116122002A CN 116122002 A CN116122002 A CN 116122002A CN 202111345366 A CN202111345366 A CN 202111345366A CN 116122002 A CN116122002 A CN 116122002A
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- 239000006260 foam Substances 0.000 title claims abstract description 100
- 238000005406 washing Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005070 sampling Methods 0.000 claims abstract description 150
- 238000001514 detection method Methods 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000001914 filtration Methods 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 239000003599 detergent Substances 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 6
- 239000012777 electrically insulating material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
-
- 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
- D06F39/06—Arrangements for preventing or destroying scum
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/18—Washing liquid level
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
Abstract
A method of detecting foam of a washing machine including a sensor includes: reading a current first sampling value of a first port of a sensor, and updating a datum line of a second port to be an updating datum line according to the change rate of the current first sampling value relative to a previous first sampling value; reading a current second sampling value of a second port of the sensor, filtering the current second sampling value to obtain a filtered current second sampling value, and comparing the filtered current second sampling value with a preset identification threshold or a preset release threshold to generate a water level detection signal; if the water level detection signal is yes, judging whether the preset foam threshold value is smaller than a difference value obtained by subtracting the product of the preset identification threshold value and the conversion coefficient from the current second sampling value after the filtering is subtracted from the updating datum line; if yes, calculating the sampling value slope of the current second sampling value after filtering relative to the last second sampling value after filtering, and judging whether the sampling value slope is smaller than a preset foam slope or not; and if not, sending out a foam signal.
Description
Technical Field
The invention relates to the technical field of clothes treatment, in particular to a method for detecting foam of a washing machine and the washing machine for detecting foam by using the method.
Background
The existing washing machines in the market basically have no foam detection function, and often users put excessive detergent or high-foam detergent when washing clothes, so that excessive foam is easily generated in the washing machine, and the foam overflows or the detergent is not rinsed after washing is finished. This is obviously not ideal.
Disclosure of Invention
The present invention aims to solve at least one of the problems described above.
In view of the above, an aspect of the present invention relates to a method of detecting foam of a washing machine including a sensor, the method including:
reading a current first sampling value of a first port of the sensor, and updating a datum line of a second port to be an updating datum line according to the change rate of the current first sampling value relative to a last first sampling value of the first port;
reading a current second sampling value of a second port of the sensor, filtering the current second sampling value to obtain a filtered current second sampling value, and comparing the filtered current second sampling value with a preset identification threshold or a preset release threshold to generate a water level detection signal;
if the water level detection signal is yes, judging whether a preset foam threshold value is smaller than a difference value obtained by subtracting the product of the preset identification threshold value and a conversion coefficient from the current second sampling value after the filtering by the updating datum line;
if the preset foam threshold is smaller than the difference value, calculating the sampling value slope of the current second sampling value after filtering relative to the last second sampling value after filtering, and judging whether the sampling value slope is smaller than the preset foam slope or not; and
and if the slope of the sampling value is not smaller than the preset foam slope, sending out a foam signal.
Thus, the detection of the foam of the washing machine can be facilitated, and the possibility that the foam overflows or the detergent is not rinsed after the washing is finished is reduced and eliminated. And, reduce, eliminate the possibility that foam detection caused by splash triggers by mistake.
Optionally, the step of reading the current first sampling value of the first port of the sensor, updating the datum line of the second port to be the updating datum line according to the change rate of the current first sampling value relative to the last first sampling value of the first port, and the step of reading the current second sampling value of the second port of the sensor, filtering the current second sampling value to obtain a filtered current second sampling value, and comparing the filtered current second sampling value with a preset identification threshold or a preset release threshold to generate a water level detection signal alternately and circularly.
Therefore, the method is beneficial to alternately and circularly updating the datum line and generating the water level detection signal, and accurately detecting the foam corresponding to the rising of the water level without false triggering caused by splashing.
Optionally, the step of reading a current first sampling value of the first port of the sensor, updating the reference line of the second port to be an updated reference line according to the change rate of the current first sampling value relative to a last first sampling value of the first port includes dividing the current first sampling value by the last first sampling value to obtain the change rate.
In this way, it is possible to facilitate the acquisition of the latest, accurate rate of change.
Optionally, the step of reading a current second sampling value of the second port of the sensor, filtering the current second sampling value to obtain a filtered current second sampling value, comparing the filtered current second sampling value with a preset identification threshold or a preset release threshold, and generating a water level detection signal includes comparing the filtered current second sampling value with the preset identification threshold in a release state.
In this way, it may be advantageous to determine whether the filtered current second sample value in the released state is greater than the preset recognition threshold.
Optionally, the step of reading a current second sampling value of the second port of the sensor, filtering the current second sampling value to obtain a filtered current second sampling value, and comparing the filtered current second sampling value with a preset identification threshold or a preset release threshold to generate a water level detection signal includes comparing the filtered current second sampling value with the preset release threshold in an identification state.
In this way, it may be helpful to determine whether the filtered current second sampling value is greater than the preset release threshold in the identification state.
Optionally, the step of reading the current second sampling value of the second port of the sensor, filtering the current second sampling value to obtain a filtered current second sampling value, and comparing the filtered current second sampling value with a preset identification threshold or a preset release threshold to generate a water level detection signal includes that if the filtered current second sampling value is greater than the preset identification threshold or the preset release threshold, the water level detection signal is yes.
In this way, it is possible to facilitate detection of foam based on the rise of the water level without false triggering caused by splash.
Optionally, if the preset foam threshold is smaller than the difference value, calculating a sample value slope of the filtered current second sample value relative to the filtered previous second sample value, and determining whether the sample value slope is smaller than the preset foam slope includes calculating a sample difference value between the filtered current second sample value and the filtered previous second sample value, to obtain the sample value slope.
In this way, it is possible to facilitate the acquisition of the latest, accurate slope of the sampling value.
Optionally, the step of sending a foam signal includes lighting an indicator to send the foam signal if the slope of the sampling value is not less than a preset foam slope.
As such, conditions that may be advantageous for foam may be observed.
Optionally, before the step of reading the current first sampling value of the first port of the sensor and updating the datum line of the second port to an updated datum line according to the change rate of the current first sampling value relative to the last first sampling value of the first port, the datum line is read from a memory, or the current first sampling value is stored in the memory as the datum line.
In this way, the reference line can be facilitated to be acquired.
Optionally, the preset identification threshold, the preset release threshold, the preset foam threshold, the conversion coefficient, the preset foam slope are experimentally measured.
In this way, accurate detection of foam may be facilitated.
Another aspect of embodiments of the invention relates to a washing machine that detects suds using the method as described herein.
Thus, the detection of the foam of the washing machine can be facilitated, and the possibility that the foam overflows or the detergent is not rinsed after the washing is finished is reduced and eliminated. And, reduce, eliminate the possibility that foam detection caused by splash triggers by mistake.
Optionally, the sensor is a capacitive sensor.
Thus, it is possible to facilitate detection of the bubbles from the bubbles, and the change in capacitance value caused by the rise of the water level.
Optionally, the washing machine includes: a cartridge that can provide a foam-generating detergent; an outer cartridge in fluid communication with the cartridge, the outer cartridge being capable of containing a mixture of the detergent and water, the outer cartridge being made of an electrically insulating material; a laundry treatment chamber located within the tub and in fluid communication with the tub, the laundry treatment chamber being receptive of the mixed liquor; a control unit; and the sensor is connected with the control unit and communicated with the outer cylinder, and the sensor is arranged on the outer surface of the outer cylinder.
Therefore, foam can be detected in a non-contact mode, the influence on the structure of the washing machine is small, and the sensor is convenient to install and fix.
Optionally, the washing machine comprises a dryer.
Thus, the foam of the washing and drying machine can be detected, and the possibility that the foam overflows or the detergent is not rinsed after the washing is finished is reduced and eliminated. And, reduce, eliminate the possibility that foam detection caused by splash triggers by mistake.
The technical solutions of the above embodiments may be combined arbitrarily, as the technical conditions allow.
The invention will be further described with reference to the accompanying drawings. The same or similar reference numerals may be used in the drawings to refer to the same or similar elements, shapes, configurations, features, steps, etc. in different embodiments, and descriptions of the same or similar elements, shapes, configurations, features, steps, effects, etc. in different embodiments may be omitted.
Drawings
Fig. 1 is a schematic structural view of a washing machine according to an aspect of an embodiment of the present invention;
FIG. 2 is a flow chart of a method of detecting foam of a washing machine according to another aspect of an embodiment of the present invention; and
Fig. 3 is a flow chart illustrating a method of detecting bubbles of a washing machine in some embodiments of the present invention.
Detailed Description
Fig. 1 is a schematic structural view of a washing machine according to an aspect of an embodiment of the present invention. As shown in fig. 1, one aspect of an embodiment of the present invention relates to a washing machine 10 that includes a sensor 12. Fig. 2 is a flow chart illustrating a method of detecting foam of a washing machine according to another aspect of an embodiment of the present invention. Referring to FIG. 2 in combination, a method 50 for detecting suds of the washing machine 10 includes the steps of:
52. reading a current first sampling value of a first port of the sensor 12, and updating a datum line of a second port to be an updating datum line according to the change rate of the current first sampling value relative to a last first sampling value of the first port;
54. reading a current second sampling value of a second port of the sensor 12, filtering the current second sampling value to obtain a filtered current second sampling value, and comparing the filtered current second sampling value with a preset identification threshold or a preset release threshold to generate a water level detection signal;
56. if the water level detection signal is yes, judging whether a preset foam threshold value is smaller than a difference value obtained by subtracting the product of the preset identification threshold value and a conversion coefficient from the current second sampling value after the filtering by the updating datum line;
58. if the preset foam threshold is smaller than the difference value, calculating the sampling value slope of the current second sampling value after filtering relative to the last second sampling value after filtering, and judging whether the sampling value slope is smaller than the preset foam slope or not; and
60. and if the slope of the sampling value is not smaller than the preset foam slope, sending out a foam signal.
In this manner, the detection of suds in the washing machine 10 may be facilitated, reducing, eliminating the possibility of suds spilling or detergent not being rinsed clean after washing is complete. And, reduce, eliminate the possibility that foam detection caused by splash triggers by mistake. That is, when water or foam splashes to the detection position of the sensor 12, it is not erroneously detected that foam is determined. Only when the foam in the washing machine 10 is normally raised to the detection position, it is judged that the foam is present.
The terms "first," "second," and the like herein do not denote a preference, a degree of importance, or the like, but rather are used to facilitate distinguishing one from another.
The first port and the second port may be sampling ports of a controller chip of the sensor 12. Examples of controllers include, but are not limited to, a micro-programmed controller (microprogrammed control unit, MCU). The first port and the second port may also be referred to as a reference channel and a non-reference channel, respectively.
The method 50 may continue throughout the powering up of the washing machine 10.
Optionally, the step 52 of reading the current first sampling value of the first port of the sensor 12 and updating the reference line of the second port to the updated reference line according to the change rate of the current first sampling value relative to the last first sampling value of the first port, and the step 54 of reading the current second sampling value of the second port of the sensor 12, filtering the current second sampling value to obtain a filtered current second sampling value, comparing the filtered current second sampling value with a preset identification threshold or a preset release threshold, and generating the water level detection signal are alternately and alternately performed in turn.
Therefore, the method is beneficial to alternately and circularly generating the updated datum line and the water level detection signal, and detecting foam corresponding to the rising of the water level in real time without false triggering caused by splashing and the like.
Optionally, the step 52 of reading the current first sampling value of the first port of the sensor 12 and updating the baseline of the second port to the updated baseline according to the rate of change of the current first sampling value relative to the last first sampling value of the first port includes dividing the current first sampling value by the last first sampling value to obtain the rate of change.
In this way, it is possible to facilitate the acquisition of the latest, real-time rate of change.
Optionally, the step 54 of reading the current second sampling value of the second port of the sensor 12, filtering the current second sampling value to obtain a filtered current second sampling value, comparing the filtered current second sampling value with a preset identification threshold or a preset release threshold, and generating the water level detection signal includes comparing the filtered current second sampling value with the preset identification threshold in a release state.
In this way, it may be advantageous to determine whether the filtered current second sample value in the released state is greater than the preset recognition threshold.
Optionally, the step 54 of reading the current second sampling value of the second port of the sensor 12, filtering the current second sampling value to obtain a filtered current second sampling value, comparing the filtered current second sampling value with a preset recognition threshold or a preset release threshold, and generating the water level detection signal includes comparing the filtered current second sampling value with the preset release threshold in the recognition state.
In this way, it may be helpful to determine whether the filtered current second sampling value is greater than the preset release threshold in the identification state.
Optionally, the step 54 of reading the current second sampling value of the second port of the sensor 12, filtering the current second sampling value to obtain a filtered current second sampling value, and comparing the filtered current second sampling value with a preset identification threshold or a preset release threshold to generate a water level detection signal includes if the filtered current second sampling value is greater than the preset identification threshold or the preset release threshold, the water level detection signal is yes.
In this way, it is possible to facilitate detection of foam based on the rise of the water level without false triggering caused by splash or the like.
Optionally, if the preset foam threshold is smaller than the difference value, the step 58 of calculating a sample slope of the filtered current second sample value relative to the filtered previous second sample value, and determining whether the sample slope is smaller than the preset foam slope includes calculating a sample difference value between the filtered current second sample value and the filtered previous second sample value, to obtain the sample slope.
In this way, it is possible to facilitate the acquisition of the latest, real-time slope of the sampled value.
Optionally, if the slope of the sampling value is not less than the preset foam slope, the step 60 of sending a foam signal includes turning on an indicator light to send the foam signal.
As such, conditions that may be advantageous for foam may be observed.
The indicator light may include a light-emitting diode (LED).
Optionally, before the step 52 of reading the current first sampling value of the first port of the sensor 12 and updating the datum line of the second port to the updated datum line according to the change rate of the current first sampling value relative to the last first sampling value of the first port, the datum line is read from a memory, or the current first sampling value is stored as the datum line in the memory.
In this way, the reference line can be facilitated to be acquired.
The memory may be the memory of the sensor 12. Examples of such memory include, but are not limited to, electrically erasable read-only memory (EEPROM).
When the controller of the sensor 12 is powered on for the first time, the read current first sampling value or the current second sampling value is stored in the memory as the reference line. The reference line may be read from the memory when the controller of the sensor 12 is subsequently powered up during use of the washing machine 10.
Optionally, the preset identification threshold, the preset release threshold, the preset foam threshold, the conversion coefficient, the preset foam slope are experimentally measured.
In this manner, it may be advantageous to accurately detect the suds of the washing machine 10.
Another aspect of an embodiment of the present invention relates to a washing machine 10 that detects suds using the method 50 as described herein.
In this manner, the detection of suds in the washing machine 10 may be facilitated, reducing, eliminating the possibility of suds spilling or detergent not being rinsed clean after washing is complete. And, reduce, eliminate the possibility that foam detection caused by splash triggers by mistake. That is, when water or foam splashes to the detection position of the sensor 12, it is not erroneously detected that foam is determined. Only when the foam in the washing machine 10 is normally raised to the detection position, it is judged that the foam is present.
The washing machine 10 can continuously perform foam detection during the entire process of energization.
Alternatively, the sensor 12 is a capacitive sensor.
Thus, it is possible to facilitate detection of the foam from the change in capacitance value caused by the rise of the water level and the foam.
Optionally, the washing machine 10 includes: a cartridge 14 that can provide a foam-generating detergent; a tub 16 in fluid communication with the cartridge 14, the tub 16 being capable of containing a mixture of the detergent and water, the tub 16 being made of an electrically insulating material; a laundry treatment chamber 18 located within the tub 16 and in fluid communication with the tub 16, the laundry treatment chamber 18 being receptive of the mixed liquor; a control unit 20; and the sensor 12 is connected with and communicates with the control unit 20, and the sensor 12 is arranged on the outer surface of the outer cylinder 16.
In this way, the sensor 12 can be facilitated to detect the foam in a non-contact manner, the structural influence on the washing machine 10 is small, and the sensor 12 can be conveniently installed and fixed.
The directions and relationships represented by the terms "outer", "inner" and the like in the present invention may be referred to as shown in the drawings, or may correspond to directions and relationships in actual use of the laundry treatment apparatus 10.
The sensor 12 may be provided on the outer surface of the bottom and/or side of the outer barrel 16. The sensor 12 may be wired and/or wirelessly connected to the control unit 20.
Optionally, the washing machine 10 comprises a washer dryer.
Thus, the foam of the washing and drying machine can be detected, and the possibility that the foam overflows or the detergent is not rinsed after the washing is finished is reduced and eliminated. And, reduce, eliminate the possibility that foam detection caused by splash triggers by mistake. That is, when water or foam splashes to the detection position of the sensor 12, it is not erroneously detected that foam is determined. Only when the foam in the washing and drying machine normally rises, but not splashes to a detection position, the foam is judged to exist.
Fig. 3 is a flow chart illustrating a method of detecting bubbles of a washing machine in some embodiments of the present invention. In some embodiments, as shown in fig. 3, the MCU of the sensor may be powered on after the washing machine is powered on. Whether the MCU is powered on for the first time can be judged, and if the MCU is powered on for the first time, the current initial sampling value (the initial first sampling value or the initial second sampling value) is stored into the EEPROM as a datum line. And if the MCU is not powered on for the first time, reading a datum line from the EEPROM.
Then, one channel (port) of the MCU chip is scanned for sampling, i.e. the MCU chip reads the real-time input value (the current first sampling value or the current second sampling value) of the sampling port. After sampling is completed, if the current sampling channel is a reference channel (first port), updating a datum line of a non-reference channel (second port) to be an updating datum line based on the change rate (current first sampling value/last first sampling value) of the reference channel, and triggering the scanning of the next channel.
And if the current sampling channel is not the reference channel but the non-reference channel, filtering the current second sampling value to obtain a filtered current second sampling value. And comparing the filtered current second sampling value with a preset recognition threshold value in a release state, or comparing the filtered current second sampling value with the preset release threshold value in the recognition state to generate a water level detection signal and triggering the next channel scanning.
The suds detection process may be performed at all times during the power-on of the washing machine. The MCU chip can be used for sampling with two ports in total when working, one is used as the reference channel, the other is used as the non-reference channel, and the two channels alternately and circularly sample, namely, the next channel of the reference channel is the non-reference channel, and the next channel of the non-reference channel is the reference channel. The reference line is updated once every sampling of the reference channel, and the non-reference channel generates one water level detection signal every sampling.
The next channel scan is triggered while judging whether the non-reference channel (water level channel) detects a water level. If the filtered current second sampling value is not greater than the preset identification threshold value or the preset release threshold value, the water level detection signal generated by the non-reference channel is no, namely the water level is not detected, and an indicator light (LED 1) of the sensor is kept in a closed state and is not lightened, so that no foam is indicated.
And if the filtered current second sampling value is greater than the preset identification threshold or the preset release threshold, the water level detection signal generated by the non-reference channel is yes, namely, the water level is detected. At this time, it is further determined whether the preset foam threshold is smaller than a difference obtained by subtracting the product of the preset identification threshold and the conversion coefficient from the current second sampling value after subtracting the filtering from the update reference line. If the preset foam threshold value is not smaller than the difference value obtained by subtracting the product of the preset identification threshold value and the conversion coefficient from the current second sampling value after subtracting the filtering from the updating datum line, the LED1 of the sensor is kept in a closed state and is not bright, and no foam is indicated.
If the preset foam threshold value is smaller than the difference value obtained by subtracting the product of the preset identification threshold value and the conversion coefficient from the updated reference line and subtracting the filtered current second sampling value, calculating a sampling difference value between the filtered current second sampling value and the filtered last second sampling value to obtain a sampling value slope, and judging whether the sampling value slope is smaller than the preset foam slope. If the slope of the sampled value is smaller than the preset foam slope, the LED1 of the sensor is kept in a closed state and is not lightened, so that no foam is indicated.
If the sample value slope is not less than the preset foam slope, only in this case will the LED1 of the sensor light up, indicating that there is foam.
And the washing machine is in a foam detection state until the washing machine is shut down.
The various embodiments described above and shown in the figures are illustrative of the invention only and not all of the invention. Any modification of the present invention by one of ordinary skill in the related art is within the scope of the basic technical idea of the present invention.
Claims (14)
1. A method (50) of detecting foam of a washing machine (10), characterized in that the washing machine (10) comprises a sensor (12), the method (50) comprising the steps of:
(52) Reading a current first sampling value of a first port of the sensor (12), and updating a datum line of a second port to be an updating datum line according to the change rate of the current first sampling value relative to a last first sampling value of the first port;
(54) Reading a current second sampling value of a second port of the sensor (12), filtering the current second sampling value to obtain a filtered current second sampling value, and comparing the filtered current second sampling value with a preset identification threshold or a preset release threshold to generate a water level detection signal;
(56) If the water level detection signal is yes, judging whether a preset foam threshold value is smaller than a difference value obtained by subtracting the product of the preset identification threshold value and a conversion coefficient from the current second sampling value after the filtering by the updating datum line;
(58) If the preset foam threshold value is smaller than the difference value, calculating the sampling value slope of the current second sampling value after filtering relative to the last second sampling value after filtering, and judging whether the sampling value slope is smaller than the preset foam slope or not; and
(60) And if the slope of the sampling value is not smaller than the preset foam slope, sending out a foam signal.
2. The method (50) of claim 1, wherein said steps (52) and (54) are alternately cycled.
3. The method (50) of claim 1, wherein the step (52) includes dividing the current first sample value by the last first sample value to obtain the rate of change.
4. The method (50) of claim 1, wherein the step (54) includes comparing the filtered current second sample value with the preset identification threshold in a released state.
5. The method (50) of claim 1, wherein the step (54) includes comparing the filtered current second sample value with the preset release threshold in an identified state.
6. The method (50) of claim 1, wherein the step (54) includes the water level detection signal being yes if the filtered current second sample value is greater than the preset identification threshold or the preset release threshold.
7. The method (50) of claim 1, wherein the step (58) includes calculating a sample difference between the filtered current second sample value and the filtered previous second sample value to obtain the sample value slope.
8. The method (50) of claim 1, wherein said step (60) includes illuminating an indicator light to signal said presence of foam.
9. The method (50) of claim 1, wherein prior to the step (52), the baseline is read from a memory or the current first sampled value is stored as the baseline in the memory.
10. The method (50) of claim 1, wherein the preset identification threshold, the preset release threshold, the preset foam threshold, the scaling factor, the preset foam slope are experimentally measured.
11. A washing machine (10), characterized in that foam is detected by a method (50) according to any one of claims 1-10.
12. The washing machine (10) of claim 11, wherein the sensor (12) is a capacitive sensor.
13. The washing machine (10) according to claim 11, characterized by comprising:
a cartridge (14) which can provide a foam-generating detergent;
an outer cartridge (16) in fluid communication with the cartridge (14), the outer cartridge (16) being adapted to hold a mixture of the detergent and water, the outer cartridge (16) being made of an electrically insulating material;
a laundry treatment chamber (18) located within the tub (16) and in fluid communication with the tub (16), the laundry treatment chamber (18) being receptive of the mixed liquor;
a control unit (20); and
the sensor (12) is connected with the control unit (20) and communicated with the control unit, and the sensor (12) is arranged on the outer surface of the outer cylinder (16).
14. The laundry machine (10) of claim 11, comprising a washer-dryer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111345366.9A CN116122002A (en) | 2021-11-15 | 2021-11-15 | Method for detecting foam of washing machine and washing machine for detecting foam by using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111345366.9A CN116122002A (en) | 2021-11-15 | 2021-11-15 | Method for detecting foam of washing machine and washing machine for detecting foam by using the same |
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| Publication Number | Publication Date |
|---|---|
| CN116122002A true CN116122002A (en) | 2023-05-16 |
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| CN202111345366.9A Pending CN116122002A (en) | 2021-11-15 | 2021-11-15 | Method for detecting foam of washing machine and washing machine for detecting foam by using the same |
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- 2021-11-15 CN CN202111345366.9A patent/CN116122002A/en active Pending
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