JP3001736B2 - Washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine for automatically supplying a required amount of detergent or displaying the required amount of detergent for washing.

[0002]

2. Description of the Related Art Conventionally, there has been considered a washing machine capable of automatically supplying a detergent, and some washing machines have been provided. Of these, the old one supplies a constant amount of detergent every time, and the new one supplies the detergent every time according to the washing water level.
Furthermore, in other washing machines, a detergent is supplied by a user, and the required amount is displayed on an appropriate display every time according to the washing water level.

[0003]

Among the above-mentioned conventional ones, in which a constant amount of detergent is supplied every time although it is automatic, the washing water level changes according to the difference in the amount of laundry, regardless of the washing water level. On the other hand, the supply amount of the detergent is not appropriate, and the amount is too large or too small, causing problems such as wasteful use of the detergent or insufficient washing effect.

[0004] On the other hand, the automatic supply of the detergent according to the washing water level every time and the display of the detergent have an advantage that the washing water level is changed in accordance with the difference in the laundry amount. I have. However, detergents vary from manufacturer to manufacturer, especially in concentration. In response to this, even if the detergent is automatically supplied every time in accordance with the washing water level, or even if it is displayed, it is not possible to cope with it. There was a problem that the washing effect was insufficient.

[0005] Further, in the case where the detergent is supplied by the user,
There is a difference between individuals who supply a relatively large amount of detergent or, conversely, a small amount of detergent. Therefore, also in this case, there is a problem that the detergent is wasted or the washing effect is insufficient.

[0006] The present invention has been made in view of the above-mentioned circumstances, and the object thereof is to provide a detergent according to not only the washing water level but also the type of detergent or the individual difference. An object of the present invention is to provide an excellent washing machine capable of supplying a more appropriate amount or displaying a required amount more appropriately.

[0007]

In order to achieve the above object, a washing machine according to the present invention comprises a washing water level setting means for setting a washing water level, and a water supply means for supplying water to a washing tub. Detergent supply means for supplying detergent into the washing tub,
And a detergent concentration detecting means for detecting a detergent concentration of water in the washing tub, and based on the setting of the washing water level by the washing water level setting means, water is supplied to the water supplying means to the set water level at the time of water supply, and the setting is performed. A required amount of detergent according to the water level is supplied to the detergent supply means, and the amount of detergent supplied is determined to be excessive or insufficient based on the detection result by the detergent concentration detection means thereafter, and the detergent supply amount by the detergent supply means is adjusted. A control means is provided.

Further, the washing machine of the present invention comprises a washing water level setting means for setting a washing water level, a water supply means for supplying water to the washing tub, a display means for displaying a required amount of detergent, and a washing tub. A detergent concentration detecting means for detecting a detergent concentration of water in the water, and, based on the setting of the washing water level by the washing water level setting means, a required detergent amount corresponding to the set water level is displayed on the display means, And a control means for judging excess or deficiency of the supplied detergent amount from the detection result by the detergent concentration detecting means and correcting the required detergent amount displayed by the display means.

Further, the washing machine of the present invention comprises a washing water level setting means for setting a washing water level, a water supply means for supplying water into the washing tub, a display means for displaying a required amount of detergent, and a washing tub. A detergent concentration detecting means for detecting a detergent concentration of water in the water, and, based on the setting of the washing water level by the washing water level setting means, a required detergent amount corresponding to the set water level is displayed on the display means, A control means for judging excess or deficiency of the supplied detergent amount from the detection result by the detergent concentration detecting means and displaying the judgment result on the display means.

[0010]

According to the above means, a required amount of the detergent is basically supplied or displayed in accordance with the set washing water level based on the setting of the washing water level by the washing water level setting means. The supply amount or the display amount is adjusted or the result of the determination is displayed by the control means based on the determination of whether the supplied detergent amount is excessive or insufficient.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, FIG. 2 shows an outer box 1 of the entire washing machine, in which an outer tub 2 serving as a water tub is provided.
And an inner tub 3 which is both a washing tub and a dehydrating tub is provided in the outer tub 2. The inner tank 3 has a large number of dehydration holes 4 formed on the peripheral side, and a stirring body 5 is disposed on the inner bottom.
A drive mechanism 7 mainly composed of a motor 6 is provided in a lower part of the outer tub 2 mainly, so that the inner tub 3 is stopped at the time of washing to rotate the stirrer 5 and the inner The tank 3 is rotated together with the stirring body 5.

In addition, an outer tank 2
A drain case 9 is disposed in connection with the drain port 8 of the first embodiment, and a drain valve 10 and a drain hose 11 are further connected. Among them, a permeability sensor 12 functioning as a detergent concentration detecting means is disposed in the drain case 9 as shown in FIG. Specifically, the transmittance sensor 12 includes a light emitting element such as a light emitting diode 13 and a light receiving element such as a phototransistor 1.
4 are covered with light-transmitting windows 15 and 16 so as to be opposed to each other, and washing water enters between them. Therefore, the light emitted from the light emitting diode 13 is transmitted by the phototransistor 14. The light is received through the light window 15, the washing water, and the light transmitting window 16, and a detection signal corresponding to the amount of received light is generated.

On the other hand, a top cover 17 is mounted on the outer box 1, and a water supply valve 18 serving as a water supply means for supplying water into the inner tank 3 (in the outer tank 2) is provided in the rear part of the top cover 17. Along with
Water level sensor 19 for detecting the water level in the outer tank 2 (in the inner tank 3)
And a detergent supply device 20 serving as a detergent supply means.
Is arranged. This detergent supply device 20 is, for example, shown in FIG.
As shown in FIG. 5, the detergent is stored in the hopper 21, and the stored detergent is supplied to the coil 2 rotated by the motor 24 with the lid 23 opened by the motor 22 (see FIG. 5).
5 and is supplied to the inner tank 3 together with the water supplied from the water supply valve 18 through the guide 26.

Furthermore, inside the front part of the top cover 17,
Control device 2 which is both a control means and a washing water level setting means
7 are arranged. The control device 27 is composed of a microcomputer. As shown in FIG. 5, an operation signal is inputted from an operation unit 28 composed of various operation switches, and a water level detection signal is outputted from the water level sensor 19, as shown in FIG.
Further, a transmittance detection signal is input from the transmittance sensor 12, and a phase difference detection signal is further input from the phase difference detection device 29 which is a laundry amount detecting means in this case.

The phase difference detecting device 29 electrically detects a load applied to the motor 6 of the driving mechanism 7 when a small amount of water is supplied into the inner tank 3 and the stirring body 5 is rotated. ,
The phase difference detection signal is output as a laundry amount detection signal. More specifically, as shown in FIG. 6, a voltage V applied to the motor 6 is detected, and a pulse rising and falling at the zero cross point is obtained. The current I flowing through the motor 6 is detected, and the rise
A falling pulse is obtained, a pulse corresponding to the phase difference θ is obtained from both pulse waveforms, a voltage signal obtained by smoothing this pulse is further digitized, and a detection signal corresponding to the laundry amount is output. I have.

The control device 27 provides an operation signal to a display section 30 composed of various display devices based on various inputs including the above-described phase difference detection signal and a control program stored in advance, and the water supply valve. 18, the motor 22, the motor 24 of the detergent supply device 20, the drain valve 1
0 and a drive control signal to drive circuits 31 to 35 for driving the motor 6 respectively.

The contents of control by the control device 27 will be described below. As shown in FIG. 1, the control device 27 determines whether or not the start switch has been operated at the beginning of the operation (step S1). When it is determined that the start switch has been operated, the washing by the phase difference detection device 29 is performed. The physical quantity is detected (step S2). Then, based on the result, a washing water level corresponding to the amount of laundry is set (step S3).
It is determined whether it is within the following range (−3 ≦ t ≦ 3) (step S4).

Here, if the operation of the washing machine is first, the stored amount of detergent t is 0 and is in the range of -3 to 3, and the water supply valve 18 is then opened to reach the set water level. And the motors 22 and 2 of the detergent supply device 20 are supplied.
4 is started to supply a required amount of detergent according to the set water level (step S5).

After that, washing is started by rotating the stirring body 5 by the motor 6 of the drive mechanism 7 (step S6), and then whether or not one minute has elapsed as an optimal time for detecting the detergent concentration is determined. (Step S
7) When the elapsed time is determined, the transmittance sensor 12
(Step S8).

FIG. 7 shows the change over time in the water permeability of the inner tub 3 when washing is performed by supplying a standard detergent. The water permeability one minute after the start of washing is the standard value. In the case of detergent, it appears at the value indicated by the characteristic line in the same figure, and when the concentration of the detergent is higher than that of the standard detergent, the water becomes turbid and the transmittance decreases quickly. Appears,
Conversely, in the case of a detergent having a concentration lower than that of the standard detergent, since the turbidity of water is slow and the transmittance decreases slowly, the detergent appears at a value higher than the value indicated by the same characteristic line.

Then, next, it is determined whether the amount of the supplied detergent is excessive or insufficient based on the above-mentioned detection result (step S9).
When the detergent concentration is equal to that of the standard detergent, the supplied detergent amount is determined to be an appropriate amount. In this case, next, it is determined whether or not the washing has reached the end time (step S10), and it is determined that the cleaning time has been reached. At this point, the washing is finished (step S11), the process proceeds to the next step, and finally returns to step S1.

On the other hand, if it is determined in step S9 that the supplied detergent amount is not an appropriate amount, then it is determined whether the supplied detergent amount is excessive (step S12), and in step S8. If the detergent concentration is higher than the standard detergent as a result of the detection, it is determined that the supplied detergent amount is excessive. In this case, -1 is subtracted from the previously stored detergent amount t (step S13). Then, the process proceeds to step S10.

If it is determined in step S12 that the supplied detergent amount is not excessive, the supplied detergent amount is determined to be insufficient (in the detection result in step S8, the detergent concentration is lower than the standard detergent). In this case, next, +1 is added to the previously stored detergent amount t (step S14),
Then, the process proceeds to step S10.

If it is determined in step S4 during the repetition of washing that the detergent amount storage value t is not in the range of -3 or more and 3 or less, then the detergent amount storage value is determined. It is determined whether or not t is smaller than -3 (there is more than three times that the amount of detergent supplied is excessive during repeated washing) (step S15). In this case, an adjustment is made to shorten the energizing time of the motor 24 of the detergent supply device 20 by α at the time of supplying the detergent (step S16), and thereafter, the detergent amount storage value t Is cleared (step S17), and step S5 is performed.
Proceed to.

On the other hand, if it is determined in step S15 that the stored detergent amount t is not smaller than -3, the stored detergent amount t is larger than 3 (the supplied detergent amount becomes insufficient during repeated washing). Is determined more than three times). In this case, the motor 24 of the detergent supply device 20 is turned on at the time of detergent supply in order to supply more detergent than before. Adjustment is performed to lengthen the time by α (step S18), and thereafter, the stored detergent amount t is cleared (step S19), and the process proceeds to step S5.

As described above, in this embodiment, the required amount of the detergent is basically supplied in accordance with the set water level based on the setting of the washing water level by the control device 27. The supply amount is adjusted by the controller 27 based on the detection result of the determination as to whether the amount of the supplied detergent is excessive or insufficient, so that the detergent can be used not only in accordance with the washing water level but also in the case where there are several types of detergent. Correspondingly, more appropriate quantities can be supplied,
Waste of detergent and insufficient washing effect can also be solved more reliably.

8 to 12 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals. Only the differences will be described. That is, in this case, first, as shown in FIG.
Is not provided, and the operation panel 41 shown in FIG.
Is provided on the front upper surface of the top cover 17.

The operation panel 41 is provided with various operation switches 42 to 50 and various display devices 51 to 51.
58, the display 56 functions as a display means for displaying the current time, the reservation time, the time and number of each stroke, the remaining time of operation, and the like, and the required detergent amount. ing. The operation switch 49
Is for inputting the type of detergent, and the display 58 is adapted to display the input type of detergent.

On the other hand, as shown in FIG.
Is a rotation speed sensor 59 that detects the rotation speed of the motor 6 as a laundry amount detection unit that replaces the phase difference detection device 29 described above.
In this case, an operation signal is inputted from an operation unit 60 composed of various operation switches 42 to 50, and an operation signal is given to a display unit 61 composed of the various displays 51 to 58. (The motors 22 and 24 of the detergent supply device 20 and the drive circuits 32 and 33 for driving them do not exist.)

Next, the contents of control by the control device 27 will be described. As shown in FIG. 11, the control device 27 determines whether or not the start switch has been operated at the beginning of the operation (step A1), and detects the amount of laundry when it is determined that the start switch has been operated (step A1). Step A2). The detection of the laundry amount is performed by detecting the rotation speed of the motor 6 when the stirring body 5 is rotated several times by the rotation speed sensor 59, and the load amount of the motor 6 increases as the laundry amount increases. Since the number of rotations decreases, the amount of laundry can be detected by detecting the number of rotations.

Thereafter, a washing water level is set in accordance with the detected laundry amount (step A3). Thereafter, a required detergent amount is calculated in accordance with the set water level (step A4). It is determined whether or not the stored value R for the correction is -1 (step A5). Here, if the operation of the washing machine is the first operation, the stored value R is 0 and not -1, so it is determined whether or not the stored value R is +1 (step A6). Since the stored value R is not determined to be +1, the required detergent amount calculated according to the set water level is displayed on the display 56 as it is (step A7). The display 56 in FIG. 9 shows an example thereof.
Indicates that 1.2 cups of detergent are required.
The user may put the indicated amount of detergent into the inner tank 3.

Thereafter, the control device 27 opens the water supply valve 18 to supply water to the set water level (step A).
8). After that, washing is started by rotating the stirrer 5 by the motor 6 of the driving mechanism 7 (step A9), and then it is determined whether or not one minute has elapsed as an optimal time for detecting the detergent concentration. (Step A10)
When it is determined that the time has elapsed, the detergent concentration is detected by the transmittance sensor 12 (step A11).

Next, as shown in FIG. 12, it is determined whether the amount of the supplied detergent is excessive or insufficient based on the above-mentioned detection result (step A12). If the detergent concentration is equal to the standard detergent, the supplied detergent amount is determined. Is determined to be an appropriate amount. In this case, it is next determined whether or not the washing has reached the end time (step A13). When it is determined that the washing has reached the washing time, the washing is terminated (step A14). Proceeding to the process, finally returns to step A1.

On the other hand, if it is determined in step A12 that the supplied detergent amount is not an appropriate amount, then it is determined whether the supplied detergent amount is excessive (step A15).
When the detergent concentration is higher than the standard detergent in the detection result in step A11, the supplied detergent amount is determined to be excessive,
In this case, next, +1 is added to the detergent amount storage value t (step A16), and the value is stored (step A1).
7) then, if its value is above +3, ie
It is determined whether or not the number of times that the supplied detergent amount is excessive exceeds three times (step A18). While it is determined in step A18 that the stored detergent amount t does not exceed +3, the process proceeds to step A13, and finally returns to step A1.

If it is determined in step A15 that the supplied detergent amount is not excessive, the supplied detergent amount is determined to be insufficient (in the detection result in step A8, the detergent concentration is lower than the standard detergent). In this case, next, -1 is subtracted from the detergent amount storage value t (step A19), the value is stored (step A20), and thereafter, whether the value is less than -3, that is, the supplied detergent, It is determined whether or not the number of determinations is insufficient three times (step A21). While it is determined in step A21 that the stored detergent amount t does not fall below -3, the process proceeds to step A13, and finally returns to step A1.

In this manner, the washing is repeated. If it is determined in step A18 that the washing amount is greater than +3, the stored value R for the correction of the necessary detergent amount is set to -1. After writing (step A22), storing the value (step A23), and clearing the detergent amount storage value t (step A24), the process proceeds to step A24.
Proceed to 13.

If it is determined in step A21 that the stored detergent amount t is smaller than -3, +1 is written into the stored value R for the correction of the required detergent amount (step A25), and the value is stored. (Step A26) After clearing the detergent amount storage value t (Step A27), the process also proceeds to Step A13.

Then, as a result of the above, the previous step A5
Then, when it is determined that the stored value R is -1,
Next, the required detergent amount calculated according to the set water level is corrected (subtracted) (step A28), and thereafter, the stored value R is cleared (step A29), and step A is executed.
Proceeding to 7, the corrected required detergent amount is displayed on the display 56. In this case, if the original display by the display 56 is the previous 1.2 cups, the display 56 displays, for example, 1.1 cups obtained by subtracting 0.1 cups.

If it is determined in step A6 that the stored value R is +1 then the required detergent amount calculated according to the set water level is corrected (added) (step A3).
0), and then clear the stored value R (Step A)
31), and the process proceeds to step A7 to display the corrected required detergent amount on the display 56. In this case, the display 5
If the original display by 6 is 1.2 cups earlier, the display 5
6 indicates, for example, 1.3 cups obtained by adding 0.1 cup.

As described above, in this embodiment, the required amount of the detergent is basically displayed based on the setting of the washing water level by the control device 27, and the detergent concentration by the transmittance sensor 12 is displayed. The display amount is adjusted by the control device 27 determining whether the amount of the supplied detergent is excessive or insufficient based on the detection result, whereby the required amount of the detergent can be adjusted not only according to the washing water level but also depending on the number of types of the detergent. The display can be made more appropriately in response to the difference. Therefore, in this case as well, the wasteful use of the detergent or the lack of the washing effect can be more reliably solved.

FIGS. 13 to 16 show a third embodiment of the present invention, which is basically the same as the second embodiment, and only the differences from the second embodiment will be described below. That is, in this case, after steps B1 to B4 similar to the steps A1 to A4 (from the determination of the operation of the start switch to the detection of the laundry amount, the setting of the washing water level, and the calculation of the required detergent amount), immediately thereafter, the step A display of the calculated detergent amount (required detergent amount) similar to A7 is performed (step B).
5). Then, Step B similar to Steps A8 to A11
6 to B9 (start of washing from water supply, judgment of progress of 1 minute,
(Until the detergent concentration is detected), and thereafter, it is determined whether the amount of detergent supplied by the user is excessive or insufficient (step B1).
0). In this case, the amount of detergent to be supplied is determined in five steps, for example, "appropriate amount", "large", "larger", "small", and "small". Is stored (step B11).

Further, through steps B12 and B13 (determination of whether or not washing is completed, execution of washing) similar to steps A13 and A14, further necessary steps (not shown)
After completing the entire operation (step B14), the determination result of the supplied detergent amount stored in step B11 is displayed (step B15). This display causes the display 56 of the operation panel 41 to make a display as shown in FIGS. 14 to 16, that is, if the stored determination result of the supplied detergent amount is “appropriate amount”, “ 100 is displayed by "100", and if it is "more", 110% is displayed by "110" in FIG. 15, and although not shown, if it is "more", it is 120% by "120". Display. On the contrary, if it is "less", 90% of the display by "90" in FIG. 16 is displayed.
Display 0%. Therefore, based on this, the user may supply the detergent amount in the next time by reducing or increasing the amount accordingly, and can supply an appropriate amount after repeating the operation several times.

Thus, also in this case, the required amount of the detergent can be displayed more appropriately not only according to the washing water level, but also according to a number of types of detergents and individual differences. In addition, wasteful use of detergent and insufficient washing effect can be more reliably solved.

The washing water level setting means may be a switch or the like that is manually operated instead of the control device 27 described above. In this case, the laundry amount detecting means exemplified by the phase difference detecting device 29 and the rotation speed sensor 59 may not be provided. In addition, the present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention.

[0045]

The washing machine of the present invention is as described above, and has the following effects. The washing machine according to claim 1, further comprising: a washing water level setting means for setting a washing water level; a water supply means for supplying water to the washing tub; And a detergent concentration detecting means for detecting a detergent concentration of water, and based on the setting of the washing water level by the washing water level setting means, water is supplied to the water supplying means to the set water level at the time of water supply, and according to the set water level. Control means for causing a required amount of detergent to be supplied to the detergent supply means, judging excess or deficiency of the supplied detergent amount based on the detection result by the detergent concentration detecting means thereafter, and adjusting the detergent supply amount by the detergent supply means. As a result, it is possible to supply a more appropriate amount of detergent, not only according to the washing water level, but also according to the type of detergent, and to use waste of detergent or insufficient washing effect. Ri an excellent effect that can be reliably solved.

According to a second aspect of the present invention, there is provided a washing machine comprising: a washing water level setting means for setting a washing water level; a water supply means for supplying water to the washing tub; a display means for displaying a required amount of detergent; And a detergent concentration detecting means for detecting the detergent concentration of water, and, based on the setting of the washing water level by the washing water level setting means, the required detergent amount corresponding to the set water level is displayed on the display means. By providing control means for judging excess or deficiency of the supplied detergent amount from the detection result by the detergent concentration detecting means and correcting the required detergent amount displayed by the display means, the required amount of detergent can be adjusted according to the washing water level. Not only that, it is also an excellent effect that it can be displayed more appropriately in response to differences in the type of detergent, and it is also possible to more reliably solve wasteful use of detergent and insufficient washing effect. Achieve the.

According to the third aspect of the present invention, there is provided a washing machine comprising: a washing water level setting means for setting a washing water level; a water supply means for supplying water into the washing tub; a display means for displaying a required amount of detergent; A detergent concentration detecting means for detecting the detergent concentration of water, and based on the setting of the washing water level by the washing water level setting means, the required detergent amount corresponding to the set water level is displayed on the display means. By providing control means for judging excess or deficiency of the supplied detergent amount from the detection result by the detergent concentration detecting means and displaying the judgment result on the display means, the necessary amount of detergent is determined according to the washing water level. Of course, it is possible to display more appropriately in response to differences in the type of detergent and individual differences, and it is possible to more reliably solve the waste of detergent and insufficient washing effect. Achieve the results.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating an operation of a first embodiment of the present invention.

FIG. 2 is an overall cutaway side view.

FIG. 3 is a longitudinal sectional view of a transmittance sensor portion.

FIG. 4 is a vertical sectional front view of a detergent supply device part.

FIG. 5 is a schematic electric configuration diagram.

FIG. 6 is a waveform chart for explaining the function contents of the phase difference detection device.

FIG. 7 is a diagram showing a change over time in the permeability of washing water.

FIG. 8 is a view corresponding to FIG. 2, showing a second embodiment of the present invention.

FIG. 9 is a plan view of an operation panel portion.

FIG. 10 is a diagram corresponding to FIG. 5;

FIG. 11 is a flowchart (1) for explaining the operation;

FIG. 12 is the same flowchart 2

FIG. 13 is a flowchart for explaining the operation of the third embodiment of the present invention.

FIG. 14 is a diagram showing an example of an excess / deficiency display of a supplied detergent amount.

FIG. 15 is a view showing another example of the display.

FIG. 16 is a diagram showing still another example of the display.

[Explanation of symbols]

3 is an inner tank, 12 is a transmittance sensor (detergent concentration detecting means),
18 is a water supply valve (water supply means), 20 is a detergent supply device (detergent supply means), 27 is a control device (wash water level setting means / control means), and 56 is a display (display means).

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-125565 (JP, A) JP-A-61-5886 (JP, A) Fully open Showa 51-101066 (JP, U) Really open Showa 62- 151885 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) D06F 39/02 D06F 33/02

Claims (3)

(57) [Claims] 1. A washing water level setting means for setting a washing water level, a water supplying means for supplying water to a washing tub, a detergent supplying means for supplying a detergent to the washing tub, and a detergent for water in the washing tub. A detergent concentration detecting means for detecting the concentration; and, based on the setting of the washing water level by the washing water level setting means, water is supplied to the water supplying means to the set water level at the time of water supply, and a required amount of detergent according to the set water level. Is supplied to the detergent supply means, and control means for judging excess or deficiency of the supplied detergent amount based on the detection result by the detergent concentration detecting means thereafter and adjusting the detergent supply amount by the detergent supply means is provided. And a washing machine. 2. A washing water level setting means for setting a washing water level, a water supply means for supplying water to a washing tub, a display means for displaying a required amount of detergent, and a detection of a detergent concentration of water in the washing tub. A washing water level set by the washing water level setting means, and a required detergent amount corresponding to the set water level is displayed on the display means, and thereafter detected by the detergent concentration detecting means. A washing machine comprising a control means for judging excess or deficiency of a supplied detergent amount from a result and correcting a required detergent amount displayed by the display means. 3. A washing water level setting means for setting a washing water level, a water supply means for supplying water to a washing tub, a display means for displaying a required amount of detergent, and a detection of a detergent concentration of water in the washing tub. A washing water level set by the washing water level setting means, and a required detergent amount corresponding to the set water level is displayed on the display means, and thereafter detected by the detergent concentration detecting means. A washing machine comprising a control means for judging excess or deficiency of the supplied detergent amount from the result and displaying the judgment result on the display means.