TWI583946B - Detection Method of Detergent Water Quality of Household Appliance - Google Patents

Description

Sensing method for washing water quality of home appliances

The invention provides a sensing method for washing water quality of household electrical appliances, in particular, a sensing method for controlling washing water volume and time by predicting a washing stroke, and controlling the washing stroke time and water by sensing the degree of dirt of the object to be cleaned. Quantity to achieve energy saving and water saving purposes.

According to the continuous advancement of the electronic technology era, many electronic and electrical home appliances have come out to provide people with comfort and convenience in life, while in daily life, clothing, food, shelter, travel and entertainment, through different Home appliances, for rapid processing, reducing manual and manual time-consuming, labor-intensive and imperfect, but in general household appliances, some need to connect with water source for work, such as: washing machine, dishwasher, etc., using water flow with cleaning liquid Cleaning the detergent, etc., so that the clothes, dishes, and the like can be cleaned without having to do it. However, during the cleaning process, the water inside the washing machine is affected by dust, fines, cleaning liquid, detergent, etc. on the clothes. , causing the turbidity of the water to increase, or the water inside the washing machine due to the dirt, fines or dust adhering to the laundry, the cleaning liquid added to the water flow, the detergent will also have the hardness of the tap water, etc., which will also lead to water quality. The turbidity and particle concentration will increase, and it is necessary to wash the clothes through a few times of water to clean the clothes or dishes. , The ion concentration for water quality after the testing standards, the current in the washing machine or dishwasher, the water quality will install sensing devices, sensing the reflected light projected after passing through the receiving quality sensing, thereby sensing the concentration of particles in the water quality (concentration of particles in water Values, such as: undissolved detergent, impurities or dust or hair or clothing dander, cotton wool, etc., for judging the turbidity of the water, and then setting the cleaning mode of household appliances such as washing machines or dishwashers; The cleaners used today continue to improve and improve the cleaning ability. Only the particle concentration in the water is detected, and the residue of the detergent during the operation of the washing machine or the dishwasher cannot be detected.

If you want to detect the residual detergent in the water, you can find out the change of the ion concentration produced by the solid dissolved in water; when the water is dissolved with dissociable salts such as salt, sweat, sugar, beverages, pigments, etc., and detergent In the case of bleaching or softening, the solution is electrically conductive, and the higher the conductivity, that is, the greater the amount of solids incorporated into the water, the higher the conductivity (Electrical Conductivity, EC).

The so-called water quality sensing is based on two categories: ion concentration and particle concentration. The ion concentration is sensed by electrodes, which can sense the concentration of soluble substances in water (TDS), and electrode sensing can be divided into Direct signal (ie conductivity) and comparison signal (eg pH). The particle concentration is the total amount of suspended solids (TSS) that is insoluble in water and is usually estimated from the turbidity sensing value. Generally, the turbidity value of water quality is between 1NTU and 10000NTU, and the detection concentration of general household appliances is between 100NTU and 4000NTU, which is different according to the manufacturer and the cleaning machine. The difference is that the ion concentration of the water is less than 1 mS/cm, and the washing appliance considers the use condition of the detergent. The general detection concentration is between 0 and 1~10 mS/cm; but the general household electrical appliance Both use a single sensor to detect water quality, and can not simultaneously detect the particle concentration, ion concentration (turbidity and conductivity) of the water, because the turbidity sensor detects the particle concentration of the water, for water quality The ion concentration cannot be detected; as for the ion concentration sensor, the ion concentration of the water is detected, and the particle size for the water is concentrated. The degree is not easy to measure; when the actual application is implemented, there are some defects and troubles, such as:

(1) The particle concentration sensor only detects the particle concentration of the water, and the ion concentration of the water is undetectable, which easily causes the residual foreign matter in the water or the detergent used for cleaning to affect the water quality. In addition, the soluble substance such as sugar, Salt, coffee, theophylline, pigments, etc. are difficult to distinguish, resulting in inaccurate cleaning operations.

(2) The ion concentration sensor only detects the ion concentration of the water. The particle concentration of the water is not detectable, and because the particle concentration in the water is higher, it is easy to cause the detection electrode of the ion concentration sensor. The occurrence of oxidation or aging may result in a shortened service life of the ion concentration sensor.

(3) At present, a single sensor installed in home appliances cannot detect the turbidity and conductivity of water quality at the same time. The judgment of water quality analysis is incorrect, and the time of controlling the washing stroke or the amount of water cannot be obtained. The effect of energy saving.

Therefore, how to solve the problem of water quality sensing (particle concentration, ion concentration), affecting the quality of the detected water quality, and causing water quality sensing when using the current turbidity sensor for water quality detection The lack of correct detection effect and inconvenience is the direction that the relevant manufacturers engaged in this industry are eager to study and improve.

Therefore, in view of the above problems and deficiencies, the inventors have collected relevant information, and through multi-party assessments and considerations, and through years of experience in the industry, through continuous trial and modification, we have designed this turbidity. The detector and the conductivity sensor simultaneously detect the particle concentration and the dissolved substance concentration in the washing water, continuously collect the sensing information after a period of time, and then analyze the change trend of the sensing value, and can judge the water quality characteristic, and then control the washing course. Home appliances The birth of the invention patent for the sensing method of washing water quality.

The main purpose of the present invention is that the washing water quality sensing step is performed by the control system operating the turbidity sensor and the conductivity sensor respectively collecting the value of the water in the water tank as a basic value, and the turbidity sensor, The conductivity sensor continuously collects the water turbidity sensing value and the conductivity sensing value of the predetermined number of seconds, and the control system records the turbidity, the conductivity starting value, the ending value, the average value, and the maximum value. And the minimum value, the values of the number of seconds in which the maximum value occurs, the number of seconds in which the minimum value occurs, and the total time of the sensed value are the characteristics of the sensing value, and then the ratio of the turbidity, the conductivity and the basic value of the washing water are separately analyzed. In order to obtain the turbidity and conductivity sensing values respectively, the control system determines whether the washing stroke continues, and achieves the purpose of controlling the washing stroke to save energy and save water.

The secondary object of the present invention is that the water quality detecting device comprises a control system, a turbidity sensor and a conductivity sensor, and a preset program for controlling the washing stroke is built in the control system, and the control system is transmitted through the control system. The turbidity sensor and the conductivity sensor are operated to sense the turbidity and conductivity of the washing water, and then the comparative analysis of various sensing values is performed to obtain the turbidity and conductivity of the water, and the synthesis is performed. The comparison analysis can determine whether the progress of the washing stroke is continued or ended, and can control the amount of washing water, stroke and washing time, etc., to achieve the purpose of fully controlling the washing operation process.

Another object of the present invention is to provide a turbidity sensor and a conductivity sensor for collecting the sensing value of the washing water for a predetermined number of seconds, and the predetermined number of seconds is 5 to 60 seconds, and can be recorded. The number of seconds between the turbidity, the initial value, the end value, the average value, the maximum value, and the minimum value of the predetermined number of seconds (5 to 60 seconds) and the total acquisition time of the sensing for the control system According to the values detected by the turbidity sensor, the conductivity sensor, etc., respectively For analysis, a comprehensive comparison analysis is performed.

1‧‧‧Water quality sensing device

11‧‧‧Control system

12‧‧‧ Turbidity Sensor

13‧‧‧ Conductivity sensor

The first figure is a simple block diagram of the present invention.

The second figure is a flow chart (1) of the present invention.

The third figure is a flow chart (2) of the present invention.

The fourth figure is a graph showing the decrease in the turbidity value of the water of the present invention.

The fifth figure is a graph showing the increase in the turbidity value of the water of the present invention.

The sixth figure is a graph showing the numerical value of the water conductivity of the present invention.

The seventh figure is a graph showing the rise in the water conductivity of the present invention.

The eighth figure is an abnormal state diagram of the water quality concentration of the present invention.

In order to achieve the above objects and effects, the technical means, the structure, the method of the implementation, and the like, which are used in the present invention, are described in detail in the preferred embodiments of the present invention.

Please refer to the first, second and third figures, which are the simple block diagram, the flow chart (1) and the flow chart (2) of the present invention. It can be clearly seen from the figure that the washing water quality of the household electrical appliance of the invention is The sensing method, the water quality sensing device 1 includes a control system 11, a turbidity sensor 12, and a conductivity sensor 13 for performing particle concentration (turbidity) or dissolved substance concentration (conductivity) of the washing water quality. A trend of change to determine the water quality characteristics of the wash water to provide a home appliance product to be washed (to be laundry or tableware, etc.) and a lotion (which may be detergent, detergent or detergent), through the control system 11 Control the washing stroke with the built-in washing program The aging time, and the water quality sensing device 1 performs the steps of sensing the water quality:

(a) The control system 11 operates the turbidity sensor 12 and the conductivity sensor 13 to separately collect the values of the clean water inside the preset home appliance sink, as the basis value of the comparison [the turbidity value of the _water , V _water , conductivity) The value E _{water is} , and the object to be cleaned (which can be clothes or tableware, etc.) and detergent are placed in the water tank.

(b) The turbidity sensor 12 and the conductivity sensor 13 continuously collect the water turbidity sensing value (V _i ) and the conductivity sensing value for a predetermined number of seconds (which may be between 5 and 60 seconds). E _i ).

(c) The control system 11 records the values continuously collected by the turbidity sensor 12 and the conductivity sensor 13, including the turbidity sensing value (V _i ) and the initial value of the conductivity sensing value (E _i ). (V _s , E _s ), end values (V _e , E _e ), average values (V _avg , E _avg ), maximum values (V _max , E _max ), and minimum values (v _min , E _min ).

(d) The turbidity sensing value (V _i ) and the maximum value (V _max , E _max ) of the conductivity sensing value (E _i ) are determined by the preset program of the control system 11 to generate the second and minimum values (V). _Min , E _min ) The number of seconds and the total value of the sensed value (N) are the characteristics of the sensed value.

(e) The preset program of the control system 11 separately compares the turbidity and conductivity sensing values (V, E) of the washing water with the basic values (V _water , E _water ), and obtains the turbidity sensing values respectively. (V _i ) and conductivity sensing value (E _i ).

(f) The preset program of the control system 11 is based on the analyzed wash water turbidity sensing value (V _i ) and the conductivity sensing value (E _i ) and then comparatively analyzed.

(g) The preset program of the control system 11 judges the time during which the washing course is performed Whether to continue, if yes, perform any of steps (h), (i), (j), and if not, perform step (c).

(h) The preset program of the control system 11 controls the water supply amount of the washing stroke to decrease or increase, and then performs step (c).

(i) The preset program of the control system 11 shortens or lengthens the time for controlling the washing stroke, and then performs step (c).

(j) The preset program of the control system 11 controls the end of the washing stroke.

The control system 11 can be a control circuit of a preset circuit layout, a central processing unit (CPU), a microprocessor or a chip, etc., and is installed in a preset home appliance (such as a washing machine or a dishwasher), and The turbidity sensor 12 and the conductivity sensor 13 installed in the preset home appliance can be controlled to detect the turbidity value and the conductivity value of the washing water of the preset home appliance, and then recorded and then compared. The analysis can further control the time of the washing process of the home appliance, the amount of water consumption, etc., and the control system 11 turbidity sensor 12 and the conductivity sensor 13 respectively for a predetermined number of seconds (may be 5~) Between 60 seconds) The turbidity sensing value (V _i ) and the conductivity sensing value (E _i ) of the washing water of the preset home appliance are collected.

Then, the control system 11 records the turbidity sensing value (V _i ) and the conductivity sensing value (E _i ) collected by the turbidity sensor 12 and the conductivity sensor 13 to include turbidity sensing. The value (V _i ), the initial value (V _s , E _s ) of the conductivity sensing value (E _i ), the end value (V _e , E _e ), the average value (V _avg , E _avg ), and the maximum value ( After V _max and E _max ) and minimum values (V _min , E _min ), the turbidity and conductivity are judged separately, and finally the turbidity value and conductivity value are combined to determine the washing time and water consumption. The control of the quantity, in the judgment of the turbidity and conductivity of the water value of the washing water, please also refer to the first, fourth, fifth, sixth, seventh and eighth figures, and the steps of judging are as follows: :

Analysis of the ratio of the turbidity value V(T _i ) of the wash water:

If [turbidity maximum (V _max ) occurs in seconds < turbidity minimum (V _min ) occurs in seconds (as shown in the fourth figure, the water turbidity gradually decreases from 0 seconds to 10 seconds, 20 seconds, etc. Drop)) and [the turbidity maximum (V _max ) occurs in seconds <3 seconds] and [total collection time (N) - turbidity minimum (V _min ) occurs in seconds <3 seconds], which means washing water The turbidity of water quality is gradually decreasing, and the washing water is being precipitated. At this time, if the turbidity detection full distance/turbidity average value (V _avg )] x% is >10%, it means that the washing water contains more sediment and particles. Or impurities, etc., the default washing program of the control system 11 can make a judgment of discharging the washing water, and then re-introducing the clean washing water for the washing stroke.

If [turbidity maximum (V _max ) occurs in seconds > turbidity minimum (V _min ) occurs in seconds (as shown in the fifth figure, the water turbidity gradually decreases from 0 seconds to 10 seconds, 20 seconds, etc.) Rising)] means that the lotion in the washing water (such as washing powder, laundry detergent or detergent) is gradually dissolved or the objects to be washed (such as clothes or tableware) are still releasing dirt (such as impurities and sediment). , dust or residue, etc., the control system's washing program can make a judgment to increase the washing time.

And the analysis of the ratio of the water conductivity value E(T _i ) of the washing water:

When the [electrical conductivity detecting full distance/conductivity average mass (E _gvg )] x% is > 5%, it means that the conductivity sensor 13 is affected by bubbles or impurities in the washing water, and the conductivity should be maximized. (E _mgx ), the minimum conductivity (E _min ) is excluded, and the second and second small values of the conductivity are taken. {The maximum conductivity (E _max ) shown in the sixth figure is about 26 20 (us) /cm), the minimum conductivity (E _min ) is about 1800 (us / cm); the second largest value is about 2500 (us / cm), the second smallest value is about 1850 (us / cm)}, and re-calculation The average value of the conductivity and the detection of the full distance until [conductivity detection full distance / conductivity average quality (E _avg )] x% ≦ 5%, indicating that the conductivity of the wash water is gradually decreasing.

And when [the maximum number of electrical conductivity (E _max ) occurs > the minimum value of the electrical conductivity (E _min ) occurs in seconds), it means that the lotion is gradually dissolved or the object to be washed (such as clothes or tableware) is still being released. Dirty or impurities, etc. (as shown in the eighth figure, the water conductivity is gradually increased from 0 seconds to 10 seconds, 20 seconds, etc.), then the washing program of the control system 11 compares the values of the conductivity and can be made. Extend the judgment of washing time.

The turbidity sensing value (V _i ) and the conductivity value (E _i ) are used for comprehensive comparison analysis:

When [(current turbidity value (V _i ) - clean water turbidity value (V _water ) / clean water turbidity value (V _water )) x% <5%, and [current conductivity value (E _i ) - clean water conductive If the value (E _water ) is x%, the washing program of the control system 11 determines that the washing water is close to the clean water, indicating that the washing stroke has been completed, and the washing program of the control system 11 can make the washing stroke end early or reduce the water supply amount. Or shorten the judgment of washing time, etc., and thus achieve the purpose of energy saving, water saving, and the like.

The above [V] represents the water turbidity, [T _i ] represents the detection time, [N] represents the total collection seconds, and 0≦T _i ≦N, [i] is a natural number, and [turbidity detection is complete The distance represents the distance between the turbidity detection time (for example, 20 seconds or 30 seconds, etc.), and the [electricity detection full distance] represents the distance between the conductivity detections (for example, 20 seconds or 30 seconds, etc.).

And the above comprehensive analysis of the turbidity sensing value (V _i ) and the conductivity value (E _i ) can be compared according to the following comprehensive formulas:

And the representative symbol definition in each comprehensive formula:

(A1) Referring to the fourth, fifth, sixth, and seventh figures, the turbidity and conductivity corresponding to each time are expressed as V(T _i ) and E(T _i ), respectively, where 0≦T _i ≦ N; N is the total detection time, and i is a natural number.

(A2) The time corresponding to each turbidity and conductivity, respectively, can also be expressed by the functions T(V _i ) and T(E _i ), where 0 ≦ V _i , E _i ≦ 3000; and i is a natural number.

(A3) The clean water turbidity value is V _water , and the clean water conductivity value is E _water .

According to the above definitions, the formula for the comparison of the turbidity and electrical conductivity of the wash water is as follows:

(B1) The turbidity increases and the conductivity increases:

T(V _max )-T(V _min )+T(E _max )−T(E _min )>0. And T(V _min )+T(E _min )<6. And 2N-T(V _max )-T(E _max )<6. And V _max -V _min >0.05xV _avg . And E _max -E _min >0.05xE _avg .

(B2) The turbidity increases and the conductivity does not change:

T(V _max )-T(V _min )>0. And T(V _min )<3. And NT (V _max ) < 3. And V _max -V _min >0.05xV _avg . And E _max - E _min ≦ 0.05xE _avg .

(B3) The turbidity increases and the conductivity decreases:

{[T(V _max )-T(V _min )]x[T(E _max )-T(E _min )]}<0. And T(V _min )+T(E _max )<6. And 2N-T(V _max )-T(E _min )<6. And V _max -V _min >0.05xV _avg . And E _max -E _min >0.05xE _avg .

(B4) The turbidity is constant and the conductivity is increased:

T(E _max )-T(E _min )>0. And T(E _min )<3. And NT(E _max )<3. And E _max -E _min >0.05xE _avg . And V _max -V _min ≦0.05xE _avg .

(B5) The turbidity is constant and the conductivity is unchanged:

E _max -E _min ≦0.05xE _avg . And V _max -V _min ≦0.05xE _avg .

(B6) The turbidity is constant and the conductivity is decreased:

T(E _max )-T(E _min )<0. And T(E _max )<3. And NT(E _min )<3. And E _max -E _min >0.05xE _avg . And V _max -V _min ≦0.05xE _avg .

(B7) The turbidity decreases and the conductivity increases:

{[T(V _max )-T(V _min )]x[T(E _max )-T(E _min )]}<0. And T(V _max )+T(E _min )<6. And 2N-T(V _min )-T(E _max )<6. And V _max -V _min >0.05xV _avg . And E _max -E _min >0.05xE _avg .

(B8) The turbidity decreases and the conductivity does not change:

T(V _max )-T(V _min )<0. And T(V _max )<3. And NT (V _min ) < 3. And V _max -V _min >0.05xV _avg . And E _max -E _min ≦0.05xE _avg .

(B9) The turbidity decreases and the conductivity decreases:

{[T(V _max )-T(V _min )]x[T(E _max )-T(E _min )]}<0. And T(V _max )+T(E _max )<6. And 2N-T(V _min )-T(E _min )<6. And V _max -V _min >0.05xV _avg . And E _max -E _min >0.05xE _avg .

The washing program of the control system 11 can analyze the ratio of the turbidity value and the conductivity value to clearly distinguish the water quality change of the washing water of the preset home appliance, and the control system 11 for the preset home appliance accurately controls the washing course. schedule.

When the turbidity sensor 12 and the conductivity sensor 13 of the preset home appliance detect an abnormal change in the water quality of the washing water, the comparison of the washing water can be performed by excluding the formula of the abnormal signal, wherein:

(C1) Turbidity: If ABS (V _i - V _avg ) ≧ 0.3 x V _avg , V _i = V _avg .

(C2) Conductivity: If ABS(E _i -E _avg )≧0.3xE _avg , E _i =E _avg .

The ABS (Absolute Value) described in the above (C1) and (C2) is "absolute value".

And the control system 11 of the preset home appliance product judges the water of the washing water The formula is as follows:

(D1) is judged in an absolute value: V _i - V _water <0; and E _{i -} E _water < 0.

(D2) Judging by relative value: ABS [V _i - V _water ] < 0.05 x V _water ; and ABS [E _{i -} E _water ] < 0.05 x E _water . Among them, V _water and E _water are the values of fresh water recorded in the previous washing course.

The ABS (Absolute value) described in the above (D2) is "absolute value".

Then, the turbidity sensor 12 and the conductivity sensor 13 can detect the water-clearing characteristics of the preset home appliance, and compare and analyze the turbidity values and the conductivity values, etc., and obtain the comparison result. The preset home appliance can be used to control the preset home appliance product through the control system 11 of the water quality sensing device 1 when the washing operation is performed, and the preset home appliance product has a plurality of washing execution manners of the washing process, and the washing can be ended early. The stroke or the reduction of the amount of water supply, etc., for the washing operation of the preset home appliance product can have a variety of different types of washing strokes for selection, thereby achieving the purpose of energy saving, power saving, and can meet the environmental protection appeal effect.

Therefore, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the method for sensing the washing quality of the household electrical appliance of the present invention, the water quality sensing device 1 includes a control system 11, The turbidity sensor 12 and the conductivity sensor 13 respectively detect the washing water quality of the preset home appliance through the washing program control turbidity sensor 12 and the conductivity sensor 13 built in the control system 11 respectively. The various values sensed by the turbidity sensor 12 and the conductivity sensor 13 are used for comparison analysis by the washing program of the control system 11, and the water quality characteristics of the washing water are determined to determine the early end of the washing course or to reduce the water supply. Wait, 俾 The operation time for controlling the washing stroke can be saved for energy saving and power saving, and the turbidity sensor 12 and the conductivity sensor 13 can respectively sense the change of the turbidity and the conductivity of the washing water, which is necessary for analysis. Various features of the washing water for changing the washing program of the control system, more modes of controlling the washing stroke, and having various washing stroke manipulation effects, so that the structures and devices that can achieve the aforementioned effects are covered by the present invention. A simple modification and an equivalent structural change are all included in the scope of the patent of the present invention and are combined with Chen Ming.

Therefore, the present invention is mainly designed for sensing methods of washing water quality of household electrical appliances, and uses a control system of a water quality sensing device to control a turbidity sensor and a conductivity sensor to separately perform washing water quality detection of preset home appliances. Measure, and according to the various values sensed, after the comparison analysis, determine the continuation or end of the washing stroke, and can achieve energy saving and power saving as the main protection focus of the washing operation, and the turbidity sensor and conductivity sensor can be Sensing the turbidity and conductivity of the washing water, respectively, only allows the control system to accurately determine the advantages of the change in washing water quality, and manipulates the washing program to perform the washing operation time and water consumption, and is available for preset home appliances. A variety of washing stroke manipulation changes are available for selection. However, the above description is only a preferred embodiment of the present invention, and thus is not intended to limit the scope of the invention, so that it is simple to use the specification and drawings of the present invention. Modifications and equivalent structural changes are all included in the scope of the patent of the present invention and are combined with Chen Ming.

In summary, the sensing method for the washing water quality of the above-mentioned home appliance product is actually capable of achieving its efficacy and purpose in practical application and implementation, and therefore the present invention is an excellent research and development, and is an application for conforming to the invention patent. The requirements, 提出 提出 提出 提出 提出 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 盼 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审 审

1‧‧‧Water quality sensing device

11‧‧‧Control system

12‧‧‧ Turbidity Sensor

13‧‧‧ Conductivity sensor

Claims (8)

A sensing method for washing water quality of household electrical appliances, wherein the water quality detecting device comprises a control system, a turbidity sensor and a conductivity sensor, and the step of sensing the washing water quality sensing: (a) controlling the operating system turbidity The sensor and the conductivity sensor first collect the value of the clean water inside the sink of the household appliance product as the basic value of the comparison, and place the object to be cleaned and the detergent in the water tank; (b) the turbidity sensor and the conductive The rate sensor continuously collects the water turbidity sensing value and the conductivity sensing value of the predetermined number of seconds; (c) the control system records include the turbidity sensing value, the initial value of the conductivity sensing value, the ending value, The average value, the maximum value, and the minimum value; (d) the preset program of the control system determines the turbidity sensing value, the maximum value of the conductivity sensing value, the minimum number of seconds, and the total time of the sensing value. Each value becomes a characteristic of the sensing value; (e) the preset program of the control system separately performs the comparison analysis of the turbidity, the conductivity and the basic value of the washing water, respectively obtaining the turbidity sensing value and the conductivity sensing value; (f) Control system The program is based on the analysis of the turbidity sensing value of the washing water and the conductivity sensing value, and then the comparison analysis is performed; (g) the preset program of the control system determines whether the time of the washing stroke is continued, and if so, the steps are respectively performed ( h), (i), (j), if not, perform step (c); (h) the preset program of the control system controls the water supply amount of the washing stroke to decrease or increase, and then performs step (c); (i) The preset program of the control system shortens or lengthens the time of the washing stroke, and then performs step (c); (j) the preset program of the control system controls the end of the washing stroke. The method for sensing the washing water quality of the household appliance according to claim 1, wherein the predetermined number of seconds in the step (b) is 5 to 60 seconds. The method for sensing the washing water quality of the household appliance according to the first aspect of the patent application, wherein the step (e) the turbidity analysis of the washing water is collected [the number of seconds of turbidity maximum occurrence < the number of seconds of the turbidity minimum value] And [the turbidity maximum occurs in seconds <3] and [total collection time - turbidity minimum occurrence time <3], which means that the turbidity is decreasing and the washing water is being precipitated. The method for sensing the washing water quality of the household appliance according to claim 3, wherein if the turbidity detecting full distance/turbidity average value x% is >10%, the washing water contains more impurities ( For example, sediment, granules, fines or grime; if the turbidity detection full distance / turbidity average value x% is <5%, it means that the detergent or the object to be washed has been fully dissolved. The method for sensing the washing water quality of the household appliance according to the first aspect of the patent application, wherein the step (e) of the turbidity analysis of the washing water, if [the turbidity maximum occurs in seconds > the turbidity minimum occurs in seconds], That is to say, the lotion is gradually dissolved or the object to be washed is still releasing dirt. The method for sensing the washing water quality of the household appliance according to claim 1, wherein the conductivity of the washing water in the step (e) is [conductivity detection full distance/turbidity average value] x% is > 5% means that the conductivity sensor is affected by bubbles or impurities (such as sediment, particles, fines or grime); and excludes the maximum and minimum values of conductivity, and then changes the next and second values, and then recalculates Average and total acquisition time, to [total collection time / average] x% ≦ 5%. The method for sensing the washing water quality of the household appliance according to the first aspect of the patent application, wherein the step (e) is an analysis of the conductivity of the washing water, and if the conductivity is [the maximum number of seconds of occurrence > the minimum number of seconds], The detergent gradually dissolves or the object to be cleaned is still releasing dirt. The method for sensing the washing water quality of the household appliance according to the first aspect of the patent application, wherein the control system of the step (f) analyzes the turbidity sensing value and the conductivity sensing value, if [(current turbidity-clean water turbidity) ) / clear water turbidity basic value] x% if < 5%, and [(current conductivity - clean water conductivity) / clear water conductivity basic value] x% if < 5%, that is, the wash water is close to the water, and represents washing If the process has been completed, the step (g) control system controls the preset program to select the execution step (h), (i) or (j).