CN110924049A - Washing machine and control method thereof - Google Patents
Washing machine and control method thereof Download PDFInfo
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- CN110924049A CN110924049A CN201811088761.1A CN201811088761A CN110924049A CN 110924049 A CN110924049 A CN 110924049A CN 201811088761 A CN201811088761 A CN 201811088761A CN 110924049 A CN110924049 A CN 110924049A
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Abstract
The invention discloses a washing machine and a control method thereof. The surface acoustic wave detection unit has specific reflection on the content of the surfactant in water, and the signal of the surface acoustic wave detection unit can directly represent the content of the surfactant, so that the surface acoustic wave detection unit can more accurately detect the content of the surfactant to judge whether the added laundry detergent is proper or not or judge whether the laundry detergent in clothes is rinsed clean or not.
Description
Technical Field
The invention belongs to the technical field of laundry equipment, and particularly relates to a washing machine and a control method thereof.
Background
In the prior GB/T4288, washing powder is used as a detection standard, and the rinsing performance index is also characterized by adopting the titration alkalinity. However, the use of liquid laundry detergents by existing users is becoming more widespread, and liquid laundry detergents are gradually used instead of washing powders. However, the main component of the actually used laundry detergent is surfactant, which often does not show alkalinity, so that the washing machine or the user cannot judge whether the clothes are rinsed cleanly according to the alkalinity index.
At present, another means for detecting whether rinsing is finished is to rely on a turbidity sensor, namely, the turbidity (light transmittance) of a rinsing water body is judged by adopting the turbidity sensor, and the rinsing is finished when the turbidity is smaller than a certain value. However, the turbidity of the rinse water using the laundry detergent is not high and does not represent a surfactant. The turbidity of the water with high content of the surfactant is not necessarily high, and the turbidity cannot reflect the content of the surfactant in the washing water, so that the content of the surfactant in the water cannot be detected according to the turbidity.
Disclosure of Invention
The invention aims to provide a washing machine, which solves the technical problem that the content of a laundry detergent cannot be judged by detecting alkalinity and turbidity of the existing washing machine.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
a washing machine comprising:
the surface acoustic wave detection unit is used for detecting the content of the surfactant in the washing water;
a controller for controlling a washing program according to the surfactant content.
As described above, the surface acoustic wave detection unit includes:
signal generating means for generating a first signal to the surface acoustic wave sensor;
the surface acoustic wave sensor is used for contacting washing water of the washing machine, the input end of the surface acoustic wave sensor is used for receiving the first signal, and the output end of the surface acoustic wave sensor is used for outputting a second signal;
the signal detection circuit is used for detecting a second signal output by the surface acoustic wave sensor, generating a third signal and sending the third signal to the controller;
and a controller for controlling a washing program according to the third signal.
The washing machine as described above, the signal detection circuit is configured to detect the first signal generated by the signal generation device and send a comparison signal generated by comparing the first signal with the second signal to the controller, and the controller is configured to control the washing program according to the comparison signal.
As described above, the surface acoustic wave sensor is located at the bottom of the tub of the washing machine. So that the surface acoustic wave sensor can contact the washing water in real time to detect the content of the surfactant when the washing water is in the washing tub.
According to the washing machine, a circulating pipeline is arranged between the bottom of the washing tub of the washing machine and other positions of the washing tub, and the surface acoustic wave sensor is located on the circulating pipeline or at the end of the circulating pipeline. The fluidity of water in the washing tub is increased by the circulation line to more accurately measure the content of the surfactant.
According to the washing machine, the circulating pipeline is provided with the filter, the filter is located on the upstream of the surface acoustic wave sensor, and the filter is used for filtering impurities in the washing water, so that the service life of the surface acoustic wave sensor is prolonged, and the detection precision is improved.
In order to further improve the fluidity of water in the washing tub, a water pump is arranged on the circulating pipeline.
According to the washing machine, the surface acoustic wave sensor comprises a box body, a substrate positioned in the box body, and an input transducer and an output transducer which are positioned on the substrate, wherein the input transducer is connected with the input end of the surface acoustic wave sensor, and the output transducer is connected with the output end of the surface acoustic wave sensor; the box body is provided with a water inlet and a water outlet, and the washing water enters the box body from the water inlet and flows out from the water outlet.
A control method of a washing machine, comprising:
detecting the content of a surfactant in the washing water by using a surface acoustic wave detection unit;
controlling the washing program according to the surfactant content.
The control method of the washing machine as described above includes the steps of:
s1, washing inlet water;
s2, throwing the laundry detergent;
s3, detecting the content of the surfactant in the washing water by using a surface acoustic wave detection unit;
and S4, judging whether the content of the surfactant is larger than a set threshold value, if so, entering a washing program, and if not, entering a step S2.
The control method of the washing machine as described above includes the steps of:
s1, rinsing and feeding water;
s2, rinsing and washing;
s3, detecting the content of the surfactant in the rinsing water by using a surface acoustic wave detection unit;
and S4, judging whether the content of the surfactant is less than a set threshold value, if so, completing the washing after the dehydration process, and if not, performing the step S1 after the dehydration.
Compared with the prior art, the invention has the advantages and positive effects that: the washing machine detects the content of the surfactant in the washing water through the surface acoustic wave detection unit, and the content of the laundry detergent is reflected through the content of the surfactant, so that the washing program is controlled. The surface acoustic wave detection unit has specific reflection on the content of the surfactant in water, and the signal of the surface acoustic wave detection unit can directly represent the content of the surfactant, so that the surface acoustic wave detection unit can more accurately detect the content of the surfactant to judge whether the added laundry detergent is proper or not or judge whether the laundry detergent in clothes is rinsed clean or not.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic block diagram of a washing machine according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a saw sensor in accordance with an embodiment of the present invention.
Fig. 3 is a schematic diagram of a saw sensor positioned on the bottom of a washing tub according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of a SAW sensor positioned in a recirculation circuit in accordance with an embodiment of the present invention.
Fig. 5 is a flowchart of a control method of a washing machine according to an embodiment of the present invention.
Fig. 6 is a flowchart of a washing method of a washing machine according to an embodiment of the present invention.
Fig. 7 is a flowchart of a rinsing method of a washing machine according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and the detailed description.
The embodiment provides a washing machine, which detects the content of a surfactant in washing water through a surface acoustic wave detection unit and controls a washing program according to the content of the surfactant. The content of the surfactant can represent the content of the liquid laundry detergent, so that the washing machine of the embodiment can detect the content of the liquid laundry detergent in the washing water through the surface acoustic wave detection unit, and the washing program is controlled according to the content of the liquid laundry detergent. Specifically, the addition of the laundry detergent may be controlled according to the content of the laundry detergent in the washing water (in this case, the washing water is the washing water in the washing tub), or the number of times and time of rinsing (in this case, the washing water is the rinsing water in the washing tub) may be controlled.
As shown in fig. 1, the washing machine of the present embodiment includes:
and the surface acoustic wave detection unit is used for detecting the content of the surfactant in the washing water.
The surface acoustic wave detection unit comprises a signal generation device, a surface acoustic wave sensor and a signal detection circuit. The following describes the components of the surface acoustic wave detection unit:
signal generating means for generating a first signal to the surface acoustic wave sensor; the signal generating device is used for generating a signal source to the surface acoustic wave sensor. The working state of the signal generating device of the embodiment is controlled by the controller. The signal generating means of this embodiment is capable of emitting a first signal of a determined frequency or of a determined amplitude.
And the surface acoustic wave sensor is used for contacting with the washing water of the washing machine so as to detect the content of the surfactant in the washing water. The input end of the surface acoustic wave sensor is used for receiving a first signal, and the output end of the surface acoustic wave sensor is used for outputting a second signal;
and the signal detection circuit is used for detecting a second signal output by the surface acoustic wave sensor, generating a third signal and sending the third signal to the controller. The second signal is generally an analog signal, and the second signal is processed and subjected to analog-to-digital conversion to generate a third signal, which is a digital signal that can be recognized by the controller.
Specifically, the signal detection circuit of the present embodiment includes an amplitude-phase detection circuit and an a/D conversion circuit. When the signal generating device sends out a first signal with determined frequency, the amplitude-phase detection circuit detects a frequency signal output by the surface acoustic wave sensor and outputs the frequency signal to the A/D conversion circuit; when the signal generating device sends out a first signal with determined amplitude, the amplitude-phase detection circuit detects the amplitude signal output by the surface acoustic wave sensor and outputs the amplitude signal to the A/D conversion circuit.
In order to avoid the situation that the signal sent by the signal source is unstable and results in inaccurate detection results, the signal detection circuit of this embodiment, specifically, the amplitude-phase detection circuit, is further connected to the output of the signal generation device, and is configured to detect the first signal generated by the signal generation device, compare the first signal with the second signal, and send the comparison signal generated by the a/D conversion circuit to the controller, and the controller controls the washing program according to the comparison signal. At this moment, the signal detection circuit detects the first signal and the second signal simultaneously, and the detection result is more accurate.
The embodiment selects an AD8302 chip as a detection circuit of the signal phase difference and the amplitude ratio. The AD8302 chip is internally integrated with a precision matching broadband logarithmic detector, a phase difference detector, an output amplifier group, a bias unit and an output reference voltage buffer, and can simultaneously measure the phase difference and the amplitude ratio of two paths of signals within the frequency range from low frequency to 2.7 GHz.
And a controller for controlling a washing process of the washing machine body according to the surfactant content (third signal). The washing machine body is a structure of the existing common washing machine and is not described again here. Wherein, the washing program can be a laundry detergent putting program or a rinsing program.
When the washing program is a laundry detergent putting program, the control process of the controller is as follows: washing and feeding water; putting the laundry detergent; detecting the content of a surfactant in the washing water by using a surface acoustic wave sensor; the controller judges whether the content of the surfactant reaches a first set threshold value, if so, the washing procedure is started, and if not, the laundry detergent is continuously put in until the content of the surfactant reaches the first set threshold value and the putting amount of the laundry detergent reaches the standard. Wherein the first set threshold is a surfactant content corresponding to an optimum amount of laundry liquid calculated according to the weight, kind, etc. of laundry.
When the washing program is a rinsing program, the control process of the controller is as follows: rinsing and feeding water; rinsing and washing; detecting the content of a surfactant in rinsing water by using a surface acoustic wave sensor; and the controller judges whether the content of the surfactant is less than a second set threshold value, if so, the washing is finished after the dewatering process is carried out, if not, the rinsing is continued after the dewatering until the content of the surfactant is less than the second set threshold value, the rinsing is clean, and the washing can be finished after the dewatering. Wherein, the second set threshold is the corresponding surfactant content when the laundry detergent in the rinsing water is washed clean (the laundry detergent content reaches the standard) calculated in advance.
As shown in fig. 2, the surface acoustic wave sensor includes a case 1, a substrate 2 located in the case 1, and an input transducer 3 and an output transducer 4 located on the substrate 2, wherein the input transducer 3 is connected to an input end of the surface acoustic wave sensor, and the output transducer 4 is connected to an output end of the surface acoustic wave sensor; the box body is provided with a water inlet 5 and a water outlet 6, and the washing water enters the box body from the water inlet 5 and flows out from the water outlet 6.
As shown in fig. 3, the surface acoustic wave sensor is located at the bottom of a washing tub (outer tub) of the washing machine, and the water inlet 5 and the water outlet 6 are both communicated with an inner cavity of the washing tub. Or when the surface acoustic wave sensor is positioned at the bottom of the washing barrel (outer barrel), the surface acoustic wave sensor is only provided with the water inlet 5, and the water inlet 5 is communicated with the inner cavity of the washing barrel, so that when the washing water exists in the washing barrel, the surface acoustic wave sensor can contact the washing water in real time to detect the content of the surfactant in the washing water.
As shown in fig. 4, a circulation pipeline is arranged between the bottom of the washing tub of the washing machine and other positions of the washing tub, the surface acoustic wave sensor is located on the circulation pipeline, and the water inlet 5 and the water outlet 6 of the surface acoustic wave sensor are connected with the circulation pipeline. Preferably, the other position is a position higher than the bottom of the tub. The embodiment increases the fluidity of water in the washing tub through the circulation line to more accurately measure the content of the surfactant. Of course, the SAW sensor can also be located at the end of the circulation line.
The circulating pipeline is provided with a filter, the filter is located at the upstream of the surface acoustic wave sensor and used for filtering impurities in the washing water, so that the service life of the surface acoustic wave sensor is prolonged, and the detection precision is improved.
In order to further improve the fluidity of the water in the washing tub, a water pump is arranged on the circulating pipeline.
The present embodiment also proposes a control method of a washing machine, as shown in fig. 5, the method of the present embodiment includes:
s1, detecting the content of the surfactant in the washing water by using a surface acoustic wave detection unit;
and S2, controlling the washing program according to the content of the surfactant. Wherein, the washing program can be a laundry detergent putting program or a rinsing program.
When the washing program is a laundry detergent putting program, the control process of the controller is as follows: washing and feeding water; putting the laundry detergent; detecting the content of a surfactant in the washing water by using a surface acoustic wave detection unit; the controller judges whether the content of the surfactant reaches a first set threshold value, if so, the washing procedure is started, and if not, the laundry detergent is continuously put in until the content of the surfactant reaches the first set threshold value and the putting amount of the laundry detergent reaches the standard. Wherein the first set threshold is a surfactant content corresponding to an optimum amount of laundry liquid calculated according to the weight, kind, etc. of laundry.
When the washing program is a rinsing program, the control process of the controller is as follows: rinsing and feeding water; rinsing and washing; detecting the content of a surfactant in rinsing water by using a surface acoustic wave detection unit; and the controller judges whether the content of the surfactant is less than a second set threshold value, if so, the washing is finished after the dewatering process is carried out, if not, the rinsing is continued after the dewatering until the content of the surfactant is less than the second set threshold value, the rinsing is clean, and the washing can be finished after the dewatering. Wherein, the second set threshold is the corresponding surfactant content when the laundry detergent in the rinsing water is washed clean (the laundry detergent content reaches the standard) calculated in advance.
Specifically, when the washing program is a laundry detergent putting program, as shown in fig. 6, the control method of the embodiment includes the following steps:
s1, washing inlet water;
s2, throwing the laundry detergent;
s3, detecting the content of the surfactant in the washing water by using a surface acoustic wave detection unit;
and S4, judging whether the content of the surfactant is larger than a first set threshold value, if so, entering a washing program, and if not, entering a step S2.
The first set threshold value is generally any value from 20ppm to 500 ppm.
Specifically, when the washing program is a rinsing program, as shown in fig. 7, the control method of the embodiment includes the following steps:
s1, rinsing and feeding water;
s2, rinsing and washing;
s3, detecting the content of the surfactant in the washing water by using a surface acoustic wave detection unit;
and S4, judging whether the content of the surfactant is less than a second set threshold value, if so, completing the washing after the dehydration process, and if not, performing the step S1 after the dehydration.
Wherein the second set threshold is any value of 0ppm to 50 ppm.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A washing machine, characterized in that it comprises:
the surface acoustic wave detection unit is used for detecting the content of the surfactant in the washing water;
a controller for controlling a washing program according to the surfactant content.
2. The washing machine as claimed in claim 1, wherein the surface acoustic wave detection unit comprises:
signal generating means for generating a first signal to the surface acoustic wave sensor;
the surface acoustic wave sensor is used for contacting washing water of the washing machine, the input end of the surface acoustic wave sensor is used for receiving the first signal, and the output end of the surface acoustic wave sensor is used for outputting a second signal;
the signal detection circuit is used for detecting a second signal output by the surface acoustic wave sensor, generating a third signal and sending the third signal to the controller;
and a controller for controlling a washing program according to the third signal.
3. A washing machine as claimed in claim 2 wherein the signal detection circuit is arranged to detect a first signal generated by the signal generating means and to send a comparison signal generated by comparing the first signal with a second signal to the controller, the controller being arranged to control the washing program in dependence on the comparison signal.
4. A washing machine as claimed in claim 2 or 3, wherein the surface acoustic wave sensor is located at a bottom of a washing tub of the washing machine; or a circulating pipeline is arranged between the bottom of the washing tub of the washing machine and other positions of the washing tub, and the surface acoustic wave sensor is positioned on the circulating pipeline or the end part of the circulating pipeline.
5. A washing machine as claimed in claim 4 wherein a filter is provided on the recirculation conduit, the filter being located upstream of the SAW sensor.
6. A washing machine as claimed in claim 4 wherein a water pump is provided on the circulation line.
7. The washing machine according to any one of claims 2 to 4, wherein the surface acoustic wave sensor comprises a box body, a substrate positioned in the box body, and an input transducer and an output transducer positioned on the substrate, wherein the input transducer is connected with an input end of the surface acoustic wave sensor, and the output transducer is connected with an output end of the surface acoustic wave sensor; the box body is provided with a water inlet and a water outlet, and the washing water enters the box body from the water inlet and flows out from the water outlet.
8. A control method of a washing machine, characterized in that the method comprises:
detecting the content of a surfactant in the washing water by using a surface acoustic wave detection unit;
controlling the washing program according to the surfactant content.
9. The control method of a washing machine as claimed in claim 8, wherein the method comprises the steps of:
s1, washing inlet water;
s2, throwing the laundry detergent;
s3, detecting the content of the surfactant in the washing water by using a surface acoustic wave detection unit;
and S4, judging whether the content of the surfactant is larger than a set threshold value, if so, entering a washing program, and if not, entering a step S2.
10. The control method of a washing machine as claimed in claim 8, wherein the method comprises the steps of:
s1, rinsing and feeding water;
s2, rinsing and washing;
s3, detecting the content of the surfactant in the rinsing water by using a surface acoustic wave detection unit;
and S4, judging whether the content of the surfactant is less than a set threshold value, if so, completing the washing after the dehydration process, and if not, performing the step S1 after the dehydration.
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| CN201811088761.1A CN110924049B (en) | 2018-09-18 | 2018-09-18 | Washing machine and control method thereof |
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| CN201811088761.1A CN110924049B (en) | 2018-09-18 | 2018-09-18 | Washing machine and control method thereof |
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| CN110924049B CN110924049B (en) | 2022-10-28 |
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| CN101736552A (en) * | 2008-11-17 | 2010-06-16 | 海尔集团公司 | Method for detecting washing powder residue and washing machine |
| CN105181617A (en) * | 2015-09-21 | 2015-12-23 | 安徽师范大学 | Sensor for mercury ion detection and preparation method and application thereof |
| CN107429462A (en) * | 2015-03-13 | 2017-12-01 | Bsh家用电器有限公司 | For running the method and washing machine of the washing machine with impedance transducer |
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2018
- 2018-09-18 CN CN201811088761.1A patent/CN110924049B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736552A (en) * | 2008-11-17 | 2010-06-16 | 海尔集团公司 | Method for detecting washing powder residue and washing machine |
| US20100139366A1 (en) * | 2008-12-10 | 2010-06-10 | BSH Bosch und Siemens Hausgeräte GmbH | Laundry treatment appliance with gas sensor and method for treating laundry |
| CN107429462A (en) * | 2015-03-13 | 2017-12-01 | Bsh家用电器有限公司 | For running the method and washing machine of the washing machine with impedance transducer |
| CN105181617A (en) * | 2015-09-21 | 2015-12-23 | 安徽师范大学 | Sensor for mercury ion detection and preparation method and application thereof |
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Effective date of registration: 20220822 Address after: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Applicant after: QINGDAO HAIER SMART TECHNOLOGY R&D Co.,Ltd. Applicant after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Applicant before: QINGDAO HAIER SMART TECHNOLOGY R&D Co.,Ltd. |
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