WO2023088312A1

WO2023088312A1 - Laundry treatment device and metallic foreign object detection method

Info

Publication number: WO2023088312A1
Application number: PCT/CN2022/132292
Authority: WO
Inventors: 李传东; 许升; 赵爱玲; 王永君; 尹俊明
Original assignee: 青岛海尔洗衣机有限公司; 海尔智家股份有限公司
Priority date: 2021-11-19
Filing date: 2022-11-16
Publication date: 2023-05-25
Also published as: CN116145384A

Abstract

A laundry treatment device and a metallic foreign object detection method. The laundry treatment device comprises a metal detection module (1) and an infrared sensing module disposed at a laundry delivery opening (301). The metallic foreign object detection method comprises: if it is determined that a time interval between a trigger signal generated by the infrared sensing module and a tub shaking signal detected by the metal detection module (1) exceeds a set time interval, it can be inferred that a user executes a laundry take-out action, and an alarm apparatus is controlled not to work. By means of the laundry treatment device and the metallic foreign object detection method, whether the user is throwing or taking out laundry can be accurately distinguished and determined; when it is determined that the time interval between the trigger signal generated by the infrared sensing module and the tub shaking signal detected by the metal detection module exceeds the set time interval, it is inferred that the user executes the laundry take-out action, and the alarm apparatus is controlled not to work, thereby avoiding the trouble brought to the user due to false alarm during laundry take-out, and improving user experience.

Description

Clothes processing equipment and metal foreign object detection method

technical field

The invention belongs to the technical field of clothing processing equipment, and in particular relates to a clothing processing equipment and a metal foreign object detection method.

Background technique

Along with improving day by day of people's living standard, washing machine has gradually become one of necessary household appliances in people's family, and most people regard washing machine as the main tool of washing clothes. Due to the fast pace of life, people often forget to check their pockets when doing laundry, and pockets often contain metal foreign objects such as coins, keys, metal ornaments, mobile phones, and earphones.

Because the clothes are stirred repeatedly during the washing process, these metal foreign objects are likely to fall out of the pockets of the clothes and directly contact the inner cylinder of the washing machine, which will cause the inner cylinder and clothes of the washing machine to be worn, and coins, keys, and metal ornaments will be damaged. Such small foreign objects are easy to get stuck in the gap of the inner cylinder, which may cause the inner cylinder to be stuck, motor overload and other problems, causing serious damage or even damage to the washing machine. It will cause damage to the user's property.

The Chinese patent with the application number 201720188233.8 discloses a clothes processing device and a metal detection device for the clothes processing device. The metal detection device includes: a base; a detection circuit, the detection circuit is set on the base, and the detection circuit is preset with a reference voltage value Coil, the coil is arranged on the base and connected with the detection circuit, the coil generates a magnetic field when energized, the magnetic field covers at least a part of the base and has magnetic force lines extending generally along the thickness direction of the base; alarm device, alarm device and detection circuit connected, the detection circuit generates a driving voltage for driving the alarm device when the metal object cuts the magnetic force line, wherein the alarm degree of the alarm device varies with the difference between the voltage value of the driving voltage and the reference voltage value.

Although the clothes processing equipment disclosed in the above application can detect whether there is metal in the put clothes, if the user has metal accessories on his hand when picking up the clothes, such as bracelets, watches, bracelets, rings and other metal foreign objects, it is very easy to trigger The false alarm of the alarm device reduces the accuracy of metal detection device identification, and the user experience is not good.

In view of this, the present invention is proposed.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a method for detecting metal foreign objects in clothes processing equipment, which can accurately distinguish and judge whether the user is throwing clothes or taking clothes, and when it is judged that the user is performing the action of taking clothes , the control alarm device does not work, avoiding the troubles caused by false alarms to the user when taking clothes, and improving the user experience.

In order to solve the above-mentioned technical problems, the first aspect of the present application discloses a method for detecting metal foreign objects in clothing processing equipment, the clothing processing equipment includes a metal detection module and an infrared sensing module arranged at the clothing input port;

The detection method includes: if it is judged that the interval between the trigger signal generated by the infrared sensing module and the shaking signal detected by the metal detection module exceeds the set interval, it can be deduced that the user performs the action of taking clothes, and the alarm device is controlled not to work.

Further, the determination method of the shaking barrel signal includes:

If the metal detection module generates more than a set number of continuous waves within the set time, and the continuous waves tend to converge, it can be determined that a barrel shaking signal is generated.

Further, the method for detecting metal foreign objects in clothes processing equipment specifically includes:

If the metal detection module senses the shaking bucket signal within the set interval after the infrared sensing module generates the trigger signal, it can be deduced that the user is performing the action of throwing clothes, and the alarm device is controlled to maintain the working state;

If after the set interval time after the infrared sensing module generates the trigger signal, the metal detection module senses the shaking bucket signal, it is inferred that the user is performing the action of taking clothes, and the control alarm device does not work;

Preferably, the set interval time is 350ms-450ms; more preferably, the set interval time is 400ms.

Further, the method for detecting metal foreign objects in clothes processing equipment further includes:

If the metal detection module generates the metal trigger signal at the same time or the infrared sensing module also generates the trigger signal within the set time difference range, an alarm is issued; otherwise, no alarm is issued.

Preferably, the alarm device includes an NFC module and an NFC alarm tag, and the method also includes:

When the alarm device is alarming, the NFC module writes the alarm information into the NFC alarm tag, and the smart terminal triggers the NFC alarm tag at close range to read the alarm information;

Preferably, the alarm information includes alarm time and/or metal foreign object information.

Further, the determination method for the metal detection module to generate a metal trigger signal includes:

Draw a waveform curve based on the collected output voltage signal of the metal detection module;

If it is determined that the metal detection module generates a single signal wave, and the output voltage signal reaches the first set voltage threshold;

Then it can be determined that a metal trigger signal is generated.

Further, the method for detecting metal foreign objects in clothes processing equipment also includes the following steps:

The data feature of the signal wave is extracted, and the extracted data feature is compared and analyzed with the preset determination data to determine the type of the metal foreign object.

Further, the method for determining whether the metal detection module generates a metal trigger signal includes the following steps:

If it is determined that the metal detection module generates a single signal wave, and the output voltage signal reaches the second set voltage threshold;

Further obtain the instantaneous slope value of the output voltage signal of the metal detection module, and compare the instantaneous slope value with the set slope threshold;

If it is determined that the instantaneous slope value is greater than the set slope threshold, it may be determined that a metal trigger signal is generated.

The second aspect of the present application further provides a laundry treatment device, which adopts any method for detecting metal foreign objects in the laundry treatment device described above.

Further, the metal detection module includes a transmitting coil and a receiving coil arranged on opposite sides of the clothes insertion opening;

Preferably, the transmitting coil and the receiving coil are located on the same horizontal plane and at the same height as the infrared sensing module.

Further, the transmitting coil and the receiving coil are arc-shaped structures or strip-shaped structures arranged symmetrically along the radial direction of the clothes insertion opening;

Preferably, the length of the transmitting coil and the receiving coil is set as L, and the diameter of the clothes insertion opening is set as D, where L=1/3D.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

1. The metal foreign body detection method provided by the present invention can accurately distinguish and judge whether the user is throwing clothes or picking them up, and the interval time between the trigger signal generated by the infrared sensing module and the shaking barrel signal sensed by the metal detection module exceeds the set time At intervals, it is inferred that the user is performing the action of taking clothes, and the control alarm device does not work, so as to avoid the troubles caused by false alarms when taking clothes, and improve the user experience.

2. In the method for detecting metal foreign matter provided by the present invention, when the metal detection module generates the metal trigger signal or the infrared sensing module also generates the trigger signal within the set time difference range, the alarm will be issued, otherwise no alarm will be issued, and the alarm can be accurately detected. It can accurately determine whether the metal detection module generates a metal trigger signal caused by metal foreign objects in the clothes, effectively shielding the interference of the internal magnetic field of the clothes processing equipment caused by external interference on the metal detection, and improving the recognition accuracy of the metal detection module Accuracy, reduce false trigger alarm phenomenon.

3. In the clothing processing equipment provided by the present invention, the metal detection module uses two arc-shaped or strip-shaped coils to detect metal foreign objects in the clothing. Compared with a traditional larger ring coil, the volume of the coil is larger. Small and convenient, with higher adaptability, easy installation, and lower cost.

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Description of drawings

In the attached picture:

Fig. 1 is a schematic flow chart of an implementation of the metal foreign matter detection method in Example 1 of the present invention;

Fig. 2 is a schematic flow chart of an implementation of the metal foreign matter detection method in Example 2 of the present invention;

Fig. 3 is a schematic flow chart of an implementation of the metal foreign matter detection method in Example 3 of the present invention;

Fig. 4 is a schematic flow chart of an implementation manner of detecting the type of metal foreign matter in Example 4 of the present invention;

Fig. 5 is a schematic diagram of a waveform curve in an embodiment of the present invention;

Fig. 6 is a schematic diagram of comparison of waveform curves of different types of metal foreign objects in the embodiment of the present invention;

Fig. 7 is a flow chart of the simulated delivery of Embodiment 6 in Embodiment 4 of the present invention;

Fig. 8 is a schematic diagram of the variation curves of the output voltage signal value and the instantaneous slope value of different types of metal foreign objects in the embodiment of the present invention;

Fig. 9 is a schematic diagram of the output voltage signal, infrared signal, and instantaneous slope value of the metal detection module changing with time when there are metal foreign objects in the clothes put in according to the embodiment of the present invention;

Fig. 10 is a schematic diagram of comparison between the instantaneous slope value output by the metal detection module and the set slope threshold when there are metal foreign objects in the clothes put in according to the embodiment of the present invention;

Fig. 11 is a schematic top view of the laundry processing equipment in Embodiment 5 of the present invention;

Fig. 12 is a schematic side view of the laundry treatment device in Embodiment 5 of the present invention;

In the figure: 1. Metal detection module; 11. Transmitting coil; 12. Receiving coil; 21. Infrared transmitting end; 22. Infrared receiving end;

It should be noted that these drawings and text descriptions are not intended to limit the concept scope of the present invention in any way, but illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments.

Detailed ways

The present invention will be further described in detail below in conjunction with the examples.

Embodiment one

This embodiment provides a method for detecting metal foreign objects in a clothes processing device. The clothes processing device includes a metal detection module and an infrared sensing module arranged at a clothes insertion port, and the metal detection module includes an induction coil.

Specifically, as shown in Figure 1, the above detection method includes the following steps:

S101: If it is determined that the infrared sensing module generates a trigger signal, the metal detection module senses the shaking barrel signal;

S102: Obtain the interval time T between the trigger signal generated by the infrared sensing module and the metal detection module sensing the shaking barrel signal;

S103: judge whether described interval time T is greater than setting interval time TS; If so, then execute step S104; If not, then execute step S105;

S104: Infer that the user performs the action of taking clothes, and control the alarm device to not work;

S105: Infer that the user performs the action of throwing clothes, and control the alarm to maintain the working state.

In the above scheme, the process of throwing clothes (without metal) is as follows: while the signal of the infrared sensing module is triggered, the metal detection module does not detect the metal trigger signal, and the clothes fall freely from the clothes inlet to the bottom of the bucket, and will hit the bottom of the inner bucket, causing the inner bucket to Shaking, the induction coil of the metal detection module generates a fluctuating signal, and the metal detection module detects the shaking signal of the barrel caused by smashing the barrel.

The process of taking clothes (without metal) is as follows: the user reaches into the bucket, the infrared signal of the infrared sensor module is blocked, at this time the metal detection module does not detect the metal trigger signal, the hand reaches into the bottom of the bucket, takes out the clothes, and the clothes leave the bucket The shaking signal of the bucket brought by the bottom is recognized by the metal detection module, and the metal detection module detects the shaking signal of the bucket brought by the clothes leaving the bottom of the bucket.

Because when throwing clothes, the clothes fall freely from the clothes inlet to the bottom of the bucket, and the time is much shorter than the time when the user's hand extends from the clothes inlet to the bottom of the bucket. Therefore, we can generate trigger signals and metal detection through the infrared sensing module The module senses the length of the interval time of shaking the barrel signal to distinguish and judge whether the user is performing the action of taking clothes or throwing clothes, and when it is judged that the action of taking clothes is carried out, the alarm device is shielded.

The metal foreign body detection method provided in this embodiment can accurately distinguish and judge whether the user is throwing clothes or taking clothes, and the time interval between the trigger signal generated by the infrared sensing module and the shaking bucket signal sensed by the metal detection module exceeds the set interval Time, it is inferred that the user is performing the action of taking clothes, and the control alarm device does not work, so as to avoid the trouble caused to the user by false alarm when taking clothes, and improve the user experience.

Further, in this embodiment, the determination method of the shaking barrel signal includes:

Specifically, it can be determined whether the barrel shaking signal is generated by whether the slope value of the wave changes positively and negatively alternately within a specified time period and whether the signal value at the point where the slope alternates shows a decreasing trend.

In this embodiment, the set quantity and the set time are determined according to the material, size, height of the clothes processing equipment and multiple simulated bucket shaking experiments.

Wherein, there are at least two continuous waves, that is, within a set time, such as 2 seconds or 100 milliseconds, the metal detection module generates 2 or more continuous waves, and the waves show a tendency to gradually converge , it can be judged that the barrel shaking signal is generated.

Since the shaking of the inner barrel generally lasts for a certain period of time and will not disappear immediately, multiple continuous waves will be generated, and as the shaking gradually weakens, the waves will also show a trend of gradual convergence. Therefore, we judge whether there are more than the set number Based on the two judging conditions of the continuous wave and whether the wave is gradually converging, it can be accurately judged whether the shaking barrel signal is generated.

In this embodiment, by adopting the above-mentioned determination method, it is possible to effectively distinguish and determine the shaking barrel signal and the metal trigger signal, and it is also possible to effectively shield the interference to the signal determination caused by electronic products such as mobile phones located near the metal detection module.

Preferably, the set interval time is 350ms-450ms; more preferably, the set interval time is 400ms. Wherein, the set interval time is obtained by test personnel through a large number of experiments.

In the method for detecting metal foreign objects in clothes processing equipment provided in this embodiment, when it is judged that the interval between the generation of the trigger signal by the infrared sensing module and the detection of the drum shaking signal by the metal detection module exceeds the set interval time, it is inferred that the user performs the action of taking clothes, and the control The alarm device does not work and shields the alarm, which can effectively solve the problem that the user has metal jewelry on his hand when taking clothes, such as bracelets, watches, bracelets, rings, etc., and the alarm device is triggered by mistake, which affects the user's experience.

Embodiment two

This embodiment provides a method for detecting metal foreign objects in clothes processing equipment based on the first embodiment, and mainly introduces in detail how to detect metal foreign objects in the clothes put in.

As shown in FIG. 2, the method for detecting metal foreign objects in clothes processing equipment described in this embodiment includes:

In the metal foreign object detection method provided by the above solution, the alarm will be issued when the metal detection module generates the metal trigger signal or the infrared sensing module also generates the trigger signal within the set time difference range; Find out whether the metal detection module generates a metal trigger signal caused by metal foreign objects in the clothes, effectively shielding the interference of the internal magnetic field of the clothes processing equipment caused by external interference on metal detection, and improving the accuracy of metal detection module identification , to reduce the phenomenon of false triggering of the alarm.

Specifically, if the time difference range is set to T0 seconds, then within T0 seconds before or after T0 seconds before the metal detection module generates the metal trigger signal, if it is determined that the infrared sensing module generates the trigger signal, it can be inferred that It is a metal trigger signal caused by metal foreign objects in the laundry, not the interference of the switch cover or nearby electronic metal equipment.

The T0 is obtained according to the simulated delivery experiment and the corresponding calculation formula. The size of T0 mainly depends on the distance between the metal detection module and the infrared sensing module in the axial direction of the inner barrel, and the distance between the metal detection module and the infrared sensing module The bigger the T0 is, the smaller it is.

Specifically, in one embodiment, the metal detection module is arranged above the infrared sensing module, and within T0 seconds after the metal detection module generates the metal trigger signal, if it is determined that the infrared sensing module also generates the trigger signal, then It can be inferred that the metal detection module is triggered by metal foreign matter in the thrown clothes, and an alarm is given, otherwise no alarm is given.

In another embodiment, the infrared sensing module is arranged above the metal detection module, and within T0 seconds after the infrared sensing module generates the trigger signal, if it is determined that the metal detection module also generates the metal trigger signal, it can be inferred that If the metal detection module is triggered by metal foreign objects in the clothes put in, an alarm will be issued, otherwise no alarm will be issued.

In a more preferred implementation of this embodiment, the infrared sensing module and the metal detection module are set at the same height, and when it is determined that the metal detection module generates a metal trigger signal, the infrared sensing module also generates a metal trigger signal. The alarm will be triggered only when the signal is triggered, which further improves the detection efficiency of metal foreign objects.

It should be noted that, preferably in this embodiment, the metal detection module and the infrared sensing module are at the same height. Even if there is a certain height difference, the height difference is relatively small and can be ignored. Therefore, the design The fixed time difference range is close to 0.

Further, in an implementation manner of this embodiment, the method for determining the metal trigger signal generated by the metal detection module specifically includes the following steps:

S201: Draw a waveform curve based on the output voltage signal of the metal detection module collected;

S202: If it is determined that the metal detection module generates a single signal wave, and the output voltage signal reaches the first set voltage threshold;

S203: It can be determined that a metal trigger signal is generated.

In the above solution, if there is metal passing through the clothes inlet, the induced voltage of the metal detection module will cause a large signal fluctuation, and a downward signal wave will be generated. If the output voltage of the metal detection module is judged to be When the value reaches or is lower than the first set voltage threshold, it can be judged that there is metal passing through.

In this embodiment, the first set voltage threshold is the set dynamic average threshold V0, and the calculation method is as follows:

V0 = V _mean - R, R = 5 mV, K = 100 points.

In a more preferred implementation of this embodiment, the alarm device includes an NFC module and an NFC alarm tag, and the method further includes:

Preferably, the alarm information includes alarm time and/or metal foreign object information, more preferably, the metal foreign object information includes the amount and/or type of metal foreign objects.

When the alarm device in this embodiment is alarming, the NFC module can write the alarm information into the NFC alarm tag, record the alarm time and/or information such as the number and/or type of metal foreign objects, so that even if the user is temporarily absent If you don’t hear the alarm next to the clothing processing equipment, you can also use smart terminals such as NFC-enabled mobile phones to identify the NFC alarm tag, query the alarm time and/or the number and/or type of metal foreign objects, etc., and the user experience is better.

Embodiment Three

This embodiment provides a method for detecting metal foreign objects in clothes processing equipment. The difference from the second embodiment above is that when judging whether a metal trigger signal is generated, the judgment of the instantaneous slope value of the output voltage signal and the set slope threshold is added. Steps to improve the recognition rate of small metal foreign objects.

Specifically, as shown in FIG. 3, FIG. 8 to FIG. 10, the method for determining the metal trigger signal generated by the metal detection module in this embodiment includes the following steps:

S301: Draw a waveform curve based on the output voltage signal of the metal detection module collected;

S302: If it is determined that the metal detection module generates a single signal wave, and the output voltage signal reaches the second set voltage threshold;

S303: further obtain the instantaneous slope value of the output voltage signal of the metal detection module, and compare the instantaneous slope value with the set slope threshold;

S304: If it is determined that the instantaneous slope value is greater than the set slope threshold, it may be determined that a metal trigger signal is generated.

In the above solution, the second set voltage threshold is smaller than the first set voltage threshold, and by the additional step of judging the instantaneous slope value and the set slope threshold, compared with the second embodiment, the first set Reduce the voltage threshold on the basis of a constant voltage threshold, because if the voltage threshold is set too large, the output voltage signal of the metal detection module will be relatively low when some small metal foreign objects pass through, and may not reach the set voltage threshold , there will be a phenomenon of missed detection.

In this embodiment, by reducing the size of the set voltage threshold and increasing the judgment steps of the instantaneous slope value and the set slope threshold, it is possible to avoid misjudgment and missed detection, effectively ensuring the accuracy of recognition. And a high recognition rate for small metal objects.

Further, when it is judged that the voltage signal output by the metal detection module exceeds the second set voltage threshold, the step of obtaining the instantaneous slope value of the output voltage signal in real time is started again, and when the output voltage signal of the metal detection module generates When there is a slight fluctuation, it will not judge the instantaneous slope value of the output voltage signal and the size of the set slope threshold, which reduces the waste of fearless resources and makes the entire judgment process more simplified and rationalized.

Further, with reference to Fig. 5, Fig. 8 to Fig. 10, the acquisition of the instantaneous slope value of the output voltage signal output by the metal detection module specifically includes the following steps:

S401: Collect the output voltage signals V1, V2, ..., Vn of the metal detection module;

S402: Draw a detection waveform curve changing with time t based on the collected output voltage signal;

S403: When it is judged that the output voltage signal is lower than the second set voltage threshold, then start to calculate the instantaneous slope value P=ΔV/Δt of the output voltage signal;

Preferably, the sampling frequency of the output voltage signal is T1, ΔV=V _n-2 -V _n , Δt=2T1, and the instantaneous slope value P=(V _n-2 -V _n )/2T1. The instantaneous slope value is obtained by calculating and analyzing the output voltage signals Vn _-2 and _Vn of the first two points. Of course, it is not limited to taking the output voltage signals of the first two points, and can also be obtained by taking the first three points, the first four points Points of the output voltage signal to calculate the instantaneous slope value.

Or, to put it another way, when it is judged that the output voltage signal is lower than the second set voltage threshold, the derivative of the output voltage signal at each point of the detection waveform curve is obtained, and when it is judged that the derivative is greater than the set threshold, that is It can be judged that the metal detection module generates a trigger signal, and it can be judged whether the infrared sensing module is in a trigger state at this time.

Preferably, in this embodiment, the instantaneous slope value P directly takes ΔV, that is, the difference between _Vn-2 - _Vn , that is, it is also possible to judge whether the metal detection module generates a trigger signal through the instantaneous drop value of the voltage signal, The same effect as the instantaneous slope value can be achieved, and the judgment steps can also be simplified.

Preferably, the sampling frequency of the output voltage signal is one point every 10-20ms, that is, 20ms≥T1≥10ms.

This application uses the time overlap width method. When it is judged that the output voltage signal of the metal detection module drops below the second set voltage threshold, the instantaneous slope value is calculated. When the instantaneous slope value of the output voltage signal reaches the set slope threshold, the infrared Whether there is a high level in the sensing module, and if so, an alarm will be issued.

Embodiment four

This embodiment provides a method for detecting metal foreign objects in clothes processing equipment based on the second embodiment. The difference from the above second embodiment is that this embodiment can determine the type of metal foreign objects according to the data characteristics of the extracted signal wave.

The method for detecting metal foreign objects in clothes processing equipment described in this embodiment further includes the following steps:

Extract the data features of the signal wave, compare and analyze the extracted data features with the preset judgment data, and judge the type of metal foreign objects.

Specifically, as shown in FIG. 4 , the method for detecting metal foreign objects in laundry processing equipment described in this embodiment specifically includes the following steps:

S501: Draw a waveform curve based on the output voltage signal of the metal detection module collected;

S502: If it is determined that the metal detection module generates a single signal wave, and the output voltage signal reaches the first set voltage threshold;

S503: Extracting the data features of the signal wave, and comparing and analyzing the extracted data features with the preset determination data, to determine the type of metal foreign matter;

S504: Reminding the user of the type of metal foreign objects in the clothes.

When the present application deduces that there are metal foreign objects in the clothes put in by the clothing processing equipment, the type of the metal foreign objects is further judged, by extracting and detecting the data features of the waveform curve, and comparing and analyzing the extracted data features with the preset judgment data, Determine the types of metal foreign objects, remind users of the types of metal foreign objects, improve the intelligence of clothing processing equipment, strengthen human-computer interaction capabilities, and improve user experience.

Further, in conjunction with what is shown in Figure 5, the extraction of the data features of the signal wave includes the following steps:

Acquiring the voltage signal Vmin of the lowest point b in the signal wave curve, and obtaining the voltage difference V _pp according to the first voltage threshold V0 and the lowest point voltage signal Vmin;

Set the point where the falling edge of the signal wave curve reaches the first voltage threshold V0 as point a, and the point where the rising edge reaches the voltage threshold V0 as point c;

Obtain the slope K ab of point _ab , the slope K _bc of point bc, the time difference T _bc of point bc and the characteristic parameter ratio Q=V _pp ÷ T _bc ;

Values of data features K _ab , K _bc , T _bc , Q=V _pp ÷ T _bc are extracted and saved.

The data features extracted in this embodiment include but are not limited to: any one of voltage difference V _pp , slope K _ab , slope K _ab , time difference T _bc , characteristic parameter ratio Q=V _pp ÷ T _bc or random combination. Of course, other defining data features can also be used, for example, the feature parameter ratio can also be the ratio of the slope K _ab to the time difference T _bc .

Due to the different contours, materials, shapes, and sizes of different types of metal foreign objects, the differences in these parameters will affect the output voltage signal of the metal detection module, which in turn will affect the data characteristic parameters voltage difference V _pp , slope K _ab , and slope K _ab , time difference T _bc , characteristic parameter ratio Q=V _pp ÷ T _bc , etc. Therefore, in this embodiment, the data characteristics of different types of metal foreign objects extracted are compared with the preset judgment data to distinguish and judge The type of the metal foreign body.

The method for judging the type of metal foreign matter in this embodiment specifically includes the following six implementations:

Implementation Mode 1

The metal foreign object detection method in this embodiment includes a one-dimensional judgment mode, the extracted data features include a first data feature, and the preset judgment data includes a first preset parameter threshold.

The one-dimensional judging mode includes: judging and comparing the first data feature with a first preset parameter threshold, and inferring the type of the metal foreign object according to the judging result.

As shown in FIG. 5 , FIG. 6 , FIG. 8 and Table 1, if the user only needs to judge two types of metal foreign objects and selects the one-dimensional judgment mode, the first data feature takes the voltage difference V _pp . The metal composition and total amount contained in different metal foreign objects are different, and the induced voltage caused by the coil is different. According to the voltage difference V _pp value, the metal foreign objects with large metal content can be distinguished.

For example, to judge the mobile phone and car key, as shown in Figure 3, the detection waveform curve of the mobile phone, bluetooth headset and car key, it is obvious that the V _pp of the mobile phone is the largest, and the V _pp of the car key is the smallest. The size of V _pp is judged by the one-dimensional judgment mode , you can detect the specific metal foreign body. For example, when the clothes processing equipment leaves the factory, the tester detects that the V _pp of the mobile phone is greater than 50mV and the V _pp of the car key is less than 30mV, the threshold value of the first preset parameter is X1, and X1 is 40mV.

V _pp V _pp	物品判断Item judgment
≤X1≤X1		物品1Item 1
＞X1>X1	物品2Item 2

Table 1

During the actual working process of the clothes processing equipment, the size of the voltage difference V _pp and the first preset parameter threshold X1 is judged, and when it is judged that the voltage difference V _pp is less than or equal to 40mV, it is inferred that the metal in the clothes is The foreign object is the car key and reminds the user. When it is judged that the voltage difference V _pp is greater than 40mV, it is inferred that the metal foreign object in the laundry is a mobile phone, and the user is reminded.

In the above solution, the first preset parameter threshold X1 and the one-dimensional judgment mode are stored in the storage unit of the laundry treatment equipment when the laundry treatment equipment leaves the factory. When the laundry processing equipment is upgraded online, the size of the first preset parameter threshold X1 will be optimized accordingly.

Or in another preferred implementation manner, the laundry processing equipment is provided with a simulated feeding program, and the user can actively optimize the first preset parameter threshold through the simulated feeding program.

In this embodiment, the first data feature described in the one-dimensional judging mode can also take any one of slope K _ab , slope K _bc , time difference T _bc and characteristic parameter ratio Q=V _pp ÷ T _bc .

As shown in Table 2 below, the first data feature can also take the characteristic parameter ratio Q, and the first preset parameter threshold is N1. In the actual process of the laundry processing equipment, if the extracted characteristic parameter ratio Q is less than or equal to N1 , it is inferred that the type of metal foreign matter in the clothing is item 1, and if it is judged that Q is greater than N1, it is inferred that the type of metal foreign matter in the clothing is item 2.

QQ	物品判断Item judgment
≤N1≤N1		物品1Item 1
＞N1>N1	物品2Item 2

Form 2

Implementation mode two

The method for detecting metal foreign objects in laundry processing equipment provided in this embodiment includes a two-dimensional judgment mode, the extracted data features further include a second data feature, and the preset judgment data further includes a second preset parameter threshold.

The two-dimensional judging mode includes: judging and comparing the first data feature and the first preset parameter threshold, and the second data feature and the second preset parameter threshold respectively, and inferring the type of the metal foreign object according to the judgment result .

Specifically, as shown in Table 3 of Figures 5-6, the V _pp of Bluetooth keys and car keys are relatively close, and the type of metal foreign objects can be further distinguished and judged by comparing the second data features.

For example, as shown in Table 3, the first data feature may be V _pp , the first preset parameter threshold value is X1; the second data feature is K _ab , and the second preset parameter threshold value is Y1. In the actual working process of the laundry processing equipment, when it is judged that V _pp ≤ X1, K _ab ≤ Y1, it can be inferred that the metal foreign body is item 1; when it is judged that V _pp ≤ X1, K _ab > Y1, then It can be inferred that the metal foreign body is item 3; when it is judged that V _pp > X1, K _ab ≤ Y1, it can be inferred that the metal foreign body is item 2; when it is judged that V _pp > X1, K _ab > Y1, then Item 4 can be inferred to be a metal foreign object.

Of course, in this embodiment, in the two-dimensional judgment mode, the first data feature and the second data feature may be voltage difference V _pp , slope K _ab , slope K _ab , time difference T _bc , characteristic parameter ratio Q = Any two combinations of V _pp ÷ T _bc .

Form 3

Implementation Mode Three

The method for detecting metal foreign objects in laundry processing equipment provided in this embodiment further includes a three-dimensional judging mode, the extracted data features further include a third data feature, and the preset judging data further includes a third preset parameter threshold.

As shown in FIG. 5, FIG. 6 and Table 4, the three-dimensional judgment mode includes: respectively judging and comparing the first data feature and the first preset parameter threshold, and the second data feature and the second preset parameter threshold, and The size of the third data feature and the threshold value of the third preset parameter, and deduce the type of the metal foreign object according to the judgment result.

As shown in Table 4, the first data feature can be V _pp , the first preset parameter threshold is X1; the second data feature is K _ab , the second preset parameter threshold is Y1; the third data feature is K _bc , The third preset parameter threshold is Z1. In the actual working process of the laundry processing equipment, when it is judged that V _pp ≤ X1, K _ab ≤ Y1, and K _bc ≤ Z1, it can be inferred that the metal foreign body is item 1; when it is judged that V _pp ≤ X1, K _ab ≤ When Y1, K _bc > Z1, it can be inferred that it is a metal foreign body as item 5; when it is judged that V _pp ≤ X1, K _ab > Y1, K _bc ≤ Z1, it can be inferred that it is a metal foreign body as item 3; When V _pp ≤ X1, K _ab > Y1, and K _bc > Z1, it can be inferred that the metal foreign body is the article 6. As shown in Table 4, eight kinds of metal foreign bodies can be inferred in this way.

Form 4

Implementation Mode Four

The metal foreign object detection method in this embodiment further includes a four-dimensional judging mode, the extracted data features further include a fourth data feature, and the preset judging data further includes a fourth preset parameter threshold. The four-dimensional judgment mode includes: respectively judging and comparing the first data feature with the first preset parameter threshold, the second data feature with the second preset parameter threshold, and the third data feature with the third preset parameter threshold, And the size of the fourth data characteristic and the threshold value of the fourth preset parameter, and deduce the type of the metal foreign object according to the judgment result.

As shown in Table 5, the first data feature can be V _pp , the first preset parameter threshold is X1; the second data feature is K _ab , the second preset parameter threshold is Y1; the third data feature is K _bc , The third preset parameter threshold is Z1; the fourth data characteristic is T _bc , and the fourth preset parameter threshold is M1.

The metal foreign body detection method provided in this embodiment can accurately determine the type of metal foreign body. The judgment method is simple and efficient. Up to 16 kinds of metal foreign bodies can be effectively detected through the four-dimensional judgment mode, and the detection of metal foreign body types is more comprehensive. Rich, able to meet the needs of most users.

Form 5

In this embodiment, the clothes processing device can default to any judgment mode in Embodiments 1 to 4. Preferably, since the four-dimensional judgment mode detects more comprehensive and rich types of metal foreign objects, the default judgment mode of the clothes processing device can be set as the four-dimensional judgment mode. .

Preferably, in the metal foreign object detection method provided in this embodiment, the user can switch and select the judgment mode according to actual needs through the control panel or control terminal of the clothes processing device, for example, the one-dimensional judgment mode is used to distinguish and judge the earphone and the car key , the user thinks that he may actually put the earphone and car key into the clothing processing equipment, then the clothing processing equipment can be switched to the one-dimensional judgment mode, which can not only meet the individual needs of the user, but also effectively improve the metal The efficiency of judging the type of foreign matter.

Preferably, when the user switches between the one-dimensional judgment mode, the two-dimensional judgment mode, the three-dimensional judgment mode and the four-dimensional judgment mode, the display unit of the clothes processing device will display the types of metal foreign objects that can be detected corresponding to each judgment mode, for Users choose to provide certain conveniences.

Implementation Mode Five

The method for detecting metal foreign objects in laundry processing equipment provided in this embodiment is different from the above-mentioned embodiments 1 to 4 in that the preset judgment data includes a plurality of numerical ranges, and metal foreign objects can be inferred by judging the intervals where the extracted data features are located. kind of.

The clothes processing device includes a one-dimensional judging mode, in which the type of the metal foreign object can be determined according to the first set value interval where the extracted first data feature is located. The first set numerical interval includes at least two numerical intervals, and different numerical intervals correspond to different types of metal foreign objects.

The clothes processing equipment includes a two-dimensional judgment mode. In the two-dimensional judgment mode, according to the first set value range where the extracted first data feature is located and the second set value range where the second data feature is located, Interval to determine the type of metal foreign body. The second set value range includes at least two or more value ranges. Similarly, the clothes processing device also includes a three-dimensional judgment mode, a four-dimensional judgment mode, a five-dimensional judgment mode... .

In this embodiment, the types of metal foreign objects are judged by the range of numerical values, and more types of metal foreign objects can be judged.

Embodiment six

The method for detecting metal foreign objects in clothing processing equipment provided in this embodiment includes the following steps:

Simulate the delivery of preset types of metal foreign objects, extract the data characteristics of the simulated waveform curve of preset types of metal foreign objects, analyze and store them;

In the subsequent process of putting clothes on, analyze and compare the characteristics of the data extracted from the actual detection and the pre-stored preset judgment data to judge the type of metal foreign objects.

Further, as shown in Figure 7, the delivery of the simulated preset types of metal foreign objects specifically includes:

Start the simulated delivery program;

Receive and save the type of metal foreign body input by the user;

Collect the output voltage signal of the metal detection module, and record the number of times N;

Determine whether the number of delivery times N reaches the set number of times N0, and if so, stop the simulation delivery, and package and upload the collected output voltage signal data of N0 times to the cloud;

The cloud extracts the data characteristics of the simulated waveform curve for each release, calculates the average value, and uses it as the preset judgment data for this type of metal foreign matter, and sends it to the control module of the clothes processing equipment.

During the follow-up work process of the laundry processing equipment, the control module compares and analyzes the detected and extracted data features with the preset judgment data to determine the type of metal foreign matter.

For example, the user can simulate the delivery of his own car key, and can set the simulation delivery 5-10 times, extract the voltage difference V _pp ' of the simulated waveform curve for each delivery, and calculate the average voltage difference of these 5-10 times The value V _pp '' is used as the preset judgment data. In the actual working process of the laundry treatment equipment, when it is judged that the voltage difference V _pp extracted from the actual detection is close to the V _pp '', or in the setting range of the V _pp '', it can be inferred that the delivery There are car keys in the clothing to remind the user.

Preferably, the laundry processing device is provided with a voice recognition module, and the voice recognition module can receive the type of metal foreign objects input by the user's voice.

In this embodiment, through the added simulation delivery program of the clothes processing equipment, the user can perform simulation delivery according to the metal foreign objects that may be placed in the clothes at home, and extract the relevant simulation data characteristics of the specific type of metal foreign objects during the simulation delivery process. , in the follow-up actual work of the clothing processing equipment as the preset judgment data to judge the type of metal foreign matter actually put into the clothes, and through the added simulation program, the detection of the type of metal foreign matter is more targeted and more accurate , to meet the individual needs of users.

In addition, the added simulated delivery program can also optimize the parameter threshold of the judgment data preset by the clothes treatment device, and realize more accurate judgment of the type of metal foreign objects that the user actually puts into the clothes treatment device.

Embodiment five

As shown in FIG. 11 to FIG. 12 , this embodiment provides a laundry processing device, which adopts the method for detecting metal foreign objects in the laundry processing device described in any one of the first to fourth embodiments above.

Further, as shown in FIG. 11 , the laundry processing equipment includes a box body 4 and a disk base 3 arranged on the box body 4, the disk base 3 is provided with a clothes insertion port 301, and the metal detection module 1 includes The transmitting coil 11 and the receiving coil 12 are arranged on opposite sides of the clothes insertion opening 301 .

The transmitting coil 11 and receiving coil 12 are connected to the controller of the clothes processing equipment through wires, and the controller controls the excitation current to inject alternating periodic signals into the transmitting coil 11 through a single-chip microcomputer, and the signal is transmitted to the receiving coil 12 in the form of electromagnetic waves to generate an induced current , the signal controller collects the change of the induced electromotive force of the receiving coil 12 to judge whether there is a metal foreign object passing through in the electromagnetic field.

Further, as shown in Fig. 11 and Fig. 12, the infrared sensing module includes an infrared transmitting terminal 21 and an infrared receiving terminal 22 which are relatively arranged on opposite sides of the clothing insertion port 301, and the infrared transmitting terminal 21 also outputs high-frequency If the voltage signal is blocked by clothing, the infrared receiving end 22 cannot receive the high-frequency signal, and the point changes from high level to low level, then it can be judged that there is an object passing through the clothing delivery port 301 .

Preferably, as shown in FIG. 11 and FIG. 12 , the transmitting coil 11 and the receiving coil 12 are located on the same horizontal plane, and the two coils are installed in the tray seat 3 of the clothes processing device, separated from the left and right ends of the clothes insertion port 301 or the front and rear ends. The two ends are aligned with each other in the horizontal plane at the same height to ensure the maximum variation of the received electromagnetic field. The size of the coil area is set according to the recognition accuracy, detection frequency and power. From the perspective of material saving and module adaptability, the coil should be as small as possible.

The transmitting coil 11, the receiving coil 12 and the infrared sensing module can be on the same horizontal plane, or can be at a certain height, which needs to be adjusted by an algorithm. Preferably, the transmitting coil 11 and the receiving coil 12 are connected to the infrared sensing module. Modules are at the same height. When the metal detection module 1 and the infrared sensing module generate trigger signals at the same time, it can be determined that the put-in clothes contain metal foreign objects.

In this embodiment, the clothes processing equipment further includes an alarm device connected to the controller, and the alarm device includes a voice alarm module and a display. A voice alarm reminds, and the display shows a fault code.

Preferably, the alarm device in this embodiment also includes an NFC module and an NFC alarm tag, and the NFC module writes the alarm information into the NFC alarm tag, records the alarm time and the metal foreign object information, so that even if the user is temporarily not next to the clothing processing equipment If the alarm is not heard, the alarm information can also be queried by identifying the NFC alarm tag.

Further, as shown in FIG. 11 , the transmitting coil 11 and the receiving coil 12 are arc-shaped structures or strip-shaped structures arranged symmetrically along the radial direction of the clothes insertion opening 301 .

In the clothing processing equipment provided in this embodiment, the metal detection module 1 uses two arc-shaped or strip-shaped coils to detect metal foreign objects in the clothing. Compared with a traditional larger ring coil, the volume of the coil is larger. Small and convenient, with higher adaptability, easy installation, and lower cost.

In this embodiment, the transmitting coil 11 and the receiving coil 12 can be arranged in an arc-shaped structure that matches the shape of the clothes insertion opening 301 , with a higher degree of adaptation. Alternatively, the transmitting coil 11 and the receiving coil 12 can also be arranged in a straight strip structure, which is simple in shape and easy to manufacture. Alternatively, the transmitting coil 11 and the receiving coil 12 can also be arranged in an arc-shaped structure protruding outward, so that the magnetic field diverges outward and the detection range is larger.

Further, it is assumed that the length of the transmitting coil 11 and the receiving coil 12 is L, and the diameter of the clothes insertion opening 301 is D, where L=1/3D. By setting the lengths of the transmitting coil 11 and the receiving coil 12 to about one-third of the diameter of the clothing insertion opening 301, it can be ensured that the magnetic field of the metal detection module 1 basically covers the entire clothing insertion opening 301, and the transmission coil 11 can be avoided. and receiving coil 12 are set too long, resulting in problems such as excessive volume of the entire metal detection module 1, inconvenient installation, and high cost.

In addition, in this embodiment, the line connecting the center of the transmitting coil 11 and the center of the receiving coil 12 passes through the center of the clothes delivery opening 301, so as to prevent the sending coil 11 and the receiving coil 12 from being arranged at the end side of the clothing delivery opening 301, and the position is biased. , the detection range is small, and the phenomenon of missing detection occurs.

The laundry processing equipment described in the embodiments of the present invention includes, but is not limited to, a washing machine, a clothes dryer, a clothes protecting machine, a washing and drying machine, and an integrated washing and caring machine. Preferably, the laundry treatment equipment described in the embodiments of the present invention is a top-wheel washing machine.

The above descriptions are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology of this patent Without departing from the scope of the technical solution of the present invention, personnel can use the technical content of the above prompts to make some changes or modify them into equivalent embodiments with equivalent changes. In essence, any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the solutions of the present invention.

Claims

A method for detecting metal foreign objects in a clothes processing device, characterized in that the clothes processing device includes a metal detection module and an infrared sensing module arranged at the clothes input port;

The detection method includes: if it is judged that the interval between the trigger signal generated by the infrared sensing module and the shaking signal detected by the metal detection module exceeds the set interval, it can be deduced that the user performs the action of taking clothes, and the alarm device is controlled not to work.
The method for detecting metal foreign objects in clothes processing equipment according to claim 1, wherein the method for determining the shaking drum signal comprises:

If the metal detection module generates more than a set number of continuous waves within the set time, and the continuous waves tend to converge, it can be determined that a barrel shaking signal is generated.
The method for detecting metal foreign objects in laundry processing equipment according to claim 1 or 2, wherein the detection method specifically includes:

If the metal detection module senses the shaking bucket signal within the set interval after the infrared sensing module generates the trigger signal, it can be deduced that the user is performing the action of throwing clothes, and the alarm device is controlled to maintain the working state;

If after the set interval time after the infrared sensing module generates the trigger signal, the metal detection module senses the shaking bucket signal, it is inferred that the user is performing the action of taking clothes, and the control alarm device does not work;

Preferably, the set interval time is 350ms-450ms; more preferably, the set interval time is 400ms.
The method for detecting metal foreign objects in laundry processing equipment according to any one of claims 1-3, further comprising:

If the metal detection module generates a metal trigger signal or the infrared sensing module also generates a trigger signal within the set time difference range, an alarm is issued, otherwise no alarm is issued;

Preferably, the alarm device includes an NFC module and an NFC alarm tag, and the method also includes:

When the alarm device is alarming, the NFC module writes the alarm information into the NFC alarm tag, and the smart terminal triggers the NFC alarm tag at close range to read the alarm information;

Preferably, the alarm information includes alarm time and/or metal foreign object information.
The method for detecting metal foreign objects in clothes processing equipment according to claim 4, wherein the method for determining the metal trigger signal generated by the metal detection module comprises:

Draw a waveform curve based on the collected output voltage signal of the metal detection module;

If it is determined that the metal detection module generates a single signal wave, and the output voltage signal reaches the first set voltage threshold;

Then it can be determined that a metal trigger signal is generated.
The method for detecting metal foreign objects in clothes processing equipment according to claim 5, further comprising the following steps:

The data feature of the signal wave is extracted, and the extracted data feature is compared and analyzed with the preset determination data to determine the type of the metal foreign object.
The method for detecting metal foreign objects in clothes processing equipment according to claim 4, wherein the method for determining the metal trigger signal generated by the metal detection module comprises the following steps:

Draw a waveform curve based on the collected output voltage signal of the metal detection module;

If it is determined that the metal detection module generates a single signal wave, and the output voltage signal reaches the second set voltage threshold;

Further obtain the instantaneous slope value of the output voltage signal of the metal detection module, and compare the instantaneous slope value with the set slope threshold;

If it is determined that the instantaneous slope value is greater than the set slope threshold, it may be determined that a metal trigger signal is generated.
A clothes treatment device, characterized in that the method for detecting metal foreign objects in a clothes treatment device according to any one of claims 1-7 above is adopted.
The clothes processing device according to claim 8, wherein the metal detection module comprises a transmitting coil and a receiving coil arranged on opposite sides of the clothes insertion opening;

Preferably, the transmitting coil and the receiving coil are located on the same horizontal plane and at the same height as the infrared sensing module.
The laundry processing device according to claim 9, wherein the transmitting coil and the receiving coil are arc-shaped structures or strip-shaped structures arranged symmetrically along the radial direction of the clothes insertion opening;

Preferably, the length of the transmitting coil and the receiving coil is set as L, and the diameter of the clothes insertion opening is set as D, where L=1/3D.