CN1199787A - Rotary-drum type washing machine - Google Patents

Abstract

To provide a drum type washing machine that accurately measures the amount of load put into a rotating drum in a short time. Measure the acceleration time Δt1 for the motor speed to accelerate from the first predetermined speed of 3000 rpm to the second predetermined speed of 4000 rpm (steps 130 to 230), and then measure the speed from the second predetermined speed during the deceleration of the free rotation state with the power supply of the motor cut off. The deceleration time Δt2 (steps 140 to 290) from 4000 rpm to the first predetermined rotational speed of 3000 rpm is calculated based on the difference between the measured acceleration time Δt1, deceleration time Δt2 and the rotational speed, and the rotational angular acceleration during acceleration and deceleration is calculated. The rotational angular acceleration is used to calculate the moment of inertia of the laundry (step 330), and then the amount of laundry is calculated according to the moment of inertia.

Description

front load washing machine

The present invention relates to a drum type washing machine capable of accurately measuring the load as the amount of laundry put in a rotary drum.

In a conventional front-loading washing machine, the moment of inertia is measured when the rotary drum in which laundry is loaded is rotated, and the amount of laundry, that is, the load on the rotary drum, is obtained by utilizing the moment of inertia in proportion to the amount of laundry.

More specifically, the equations of motion in the rotating coordinate system at the time of acceleration and deceleration of the rotating drum are represented by the following equations (1) and (2), respectively.

(I _CS +I _B )dω/dt+kω ² ＝TT _L ...(1)

(I _CS +I _B )dω/dt＝T _L +kω ² …(2)

Among them, I _CS is the moment of inertia of the laundry, I _B is the moment of inertia of the rotating drum, ω is the rotational angular velocity of the rotating drum, k is the air viscous impedance coefficient when the rotating drum rotates, T is the driving torque of the rotating drum, T _L is a torque loss portion.

From the equation of motion at the time of acceleration shown in the equation (1), the moment of inertia I _CS of the laundry can be expressed as follows.

I _CS ＝(TT _L -kω ² )/(dω/dt)-I _B ...(3)

If the moment of inertia of the laundry is calculated according to this equation, the amount of laundry can be obtained from the moment of inertia.

As mentioned above, in the conventional method of calculating the moment of inertia of the laundry according to the formula (3) and calculating the amount of laundry according to the moment of inertia, even when the torque loss T _L fluctuates, there may be cases where the load is rotated at the same amount of laundry. When the rotational speed of the drum increases and changes, the amount of laundry calculated when the torque loss is large is larger than the actual amount, and when the torque loss is small, the amount of laundry calculated is small.

The torque loss is constituted by the fixed loss such as the added bearing loss and the transmission loss of the torque transmission belt, and the loss caused by the vibration caused by the bias of the laundry, but the fluctuation of the torque loss depends on the time of the fixed loss Variations due to different factors, that is, fluctuations caused by the difference between the fixed loss when the product is shipped and the fixed loss that has elapsed during use, fluctuations caused by changes in the temperature of the torque transmission belt that accompany changes in belt tension, and differences in the bias of the laundry And produced. Since such a torque loss always fluctuates, there is a problem that it is difficult to accurately obtain the amount of laundry in the conventional method.

In addition, when the load of the front-loading washing machine exceeds a specified limit or the load balance in the dehydration tank is poor, it takes time to accelerate the dehydration tank to a predetermined rotational acceleration, so there is also a problem that it takes time to measure the amount of laundry.

In view of the above problems, an object of the present invention is to provide a front-loading washing machine capable of accurately measuring the amount of load put into the rotary drum in a short time.

In order to achieve the above object, the main points of the drum-type washing machine in the scheme 1 of the present invention include: a rotational speed detection device, which detects the rotational speed of the rotating drum or the rotational speed of the motor driving the rotating drum; The rotation speed detected by the device calculates the first rotation angular acceleration near the set rotation speed in the acceleration of the rotating drum; the second rotation angular acceleration calculation device calculates the speed at which the motor is cut off according to the rotation speed detected by the rotation speed detection device. a second rotational angular acceleration around a set rotational speed during deceleration of the powered rotary drum in a free-rotation state; and load amount judging means for judging a load amount in the rotary drum based on said first and second rotational angular accelerations.

As the first aspect of the present invention, since the first rotational angular acceleration in acceleration is calculated, and the second rotational angular acceleration in the free-rotation state deceleration after cutting off the power supply to the motor is calculated at the same time, it is determined as the load according to the first and second rotational angular accelerations. Therefore, it is not affected by torque loss as in the past, and can accurately measure the load.

In addition, the gist of the drum-type washing machine according to claim 2 of the present invention is that, in the first claim of the present invention, the acceleration time for accelerating from the first predetermined speed to the second predetermined speed according to the speed detected by the speed detecting means during the motor acceleration is and the difference between the first and second predetermined rotational speeds, the first rotational angular acceleration calculation means calculates the first rotational angular acceleration; according to the rotational angular acceleration detected by the rotational speed detection means during deceleration in the state of free rotation in which the power supply of the motor is cut off The second rotational angular acceleration calculation means calculates the second rotational angular acceleration based on the difference between the deceleration time for the rotational speed to decelerate from the second predetermined rotational speed to the first predetermined rotational speed and the first and second predetermined rotational speeds.

As the second scheme of the present invention, calculate the first rotational angular acceleration according to the acceleration time from the first predetermined rotational speed to the second predetermined rotational speed and the difference between the first predetermined rotational speed and the second predetermined rotational speed; The second rotational angular acceleration is calculated from the deceleration time for the rotational speed to decelerate from the second predetermined rotational speed to the first predetermined rotational speed during deceleration in the free rotation state and the difference between the first and second predetermined rotational speeds.

Furthermore, the main point of the drum type washing machine according to the third aspect of the present invention is that, in the first aspect of the present invention, according to the rotation speed change detected by the rotation speed detection device during the acceleration of the motor, the first predetermined rotation speed changes within a predetermined time. and the predetermined time, the first rotational angular acceleration calculation means calculates the first rotational angular acceleration; according to the rotational speed detected by the rotational speed detection means in the deceleration of the free rotation state in which the power supply of the motor is cut off from the second predetermined rotational speed The second rotational angular acceleration calculation means calculates the second rotational angular acceleration according to the rotational speed change within a predetermined time and the predetermined time.

As the third solution of the present invention, the first rotational angular acceleration is calculated according to the change of the rotational speed from the first predetermined rotational speed within a predetermined time and the predetermined time; The second rotational angular acceleration is calculated from a change in rotational speed during which the second predetermined rotational speed changes within a predetermined time and the predetermined time.

The gist of the drum-type washing machine according to the fourth aspect of the present invention is that, in the second or third aspect of the present invention, a warning device is provided, and during the deceleration of the free-rotation state in which the power supply to the motor is cut off, the rotational speed detection device detects A warning is issued when the rotational speed of the motor does not decelerate from the second predetermined rotational speed to the first predetermined rotational speed within a specified time.

As the fourth aspect of the present invention, in the case of deceleration in the free rotation state in which the power supply of the motor is cut off, if the rotation speed does not decelerate from the second predetermined rotation speed to the first predetermined rotation speed within a specified time, a warning is issued, It can be known whether or not there is too much laundry thrown in.

In addition, the main point of the drum type washing machine according to the fifth aspect of the present invention is that, in the second or third aspect of the present invention, a warning device is provided, and during the acceleration of the motor, the rotation speed detected by the rotation speed detection device is changed from the When the first predetermined rotational speed does not accelerate to the second predetermined rotational speed within a specified time, a warning is issued.

As the fifth aspect of the present invention, when the rotation speed of the motor does not accelerate from the first predetermined rotation speed to the second predetermined rotation speed within a specified time during the acceleration of the motor, a warning is issued, so that the input laundry can be known. Is it too much.

Furthermore, the gist of the drum-type washing machine according to the sixth aspect of the present invention is that, in the first aspect of the present invention, a device for starting water supply is provided, and since the load judging device judges the load before washing starts, the load After the amount judging device finishes judging the load amount, the water supply to the rotary tank is started before the rotation of the rotary drum is stopped.

As the sixth aspect of the present invention, since the determination of the load is performed before the start of washing, and the water supply to the rotary tank is started before the rotation of the rotary drum is stopped after the load determination process is completed, the time before the start of washing can be shortened.

The gist of the drum type washing machine according to the seventh aspect of the present invention is that, in the first aspect of the present invention, a water supply start device is provided, and when the load determined by the load determination device is below a predetermined value, the water supply to the rotary tank is started. water supply.

As the seventh aspect of the present invention, since the water supply to the rotary tank is started when the load determined by the load determination means is below a predetermined value, appropriate washing can be performed.

In addition, the main point of the drum type washing machine according to the eighth aspect of the present invention is that, in the first aspect of the present invention, a deceleration state setting device is provided, and after the first rotational angular acceleration calculating means calculates the first rotational angular acceleration, , immediately cut off the power supply to the motor, and set the rotating drum to the deceleration state of the free rotation state.

As the eighth aspect of the present invention, since the power supply to the motor is cut off immediately after the first rotational angular acceleration is calculated, and the rotary drum is set in a deceleration state of a free rotation state, the load judging processing time can be shortened.

Furthermore, the gist of the drum-type washing machine according to the ninth aspect of the present invention is that, in the first aspect of the present invention, a braking device is provided, and in the deceleration state of the free-rotating state of the rotating drum that cuts off the power supplied by the motor, When the rotation speed detected by the rotation speed detection device is lower than a predetermined rotation speed or when a predetermined time has elapsed, the rotation of the motor is forcibly stopped.

As the ninth aspect of the present invention, in the deceleration state of the free-rotating state of the rotating drum, which cuts off the power supply to the motor, the motor is forcibly stopped when the rotation speed is lower than a predetermined rotation speed or when a predetermined time has elapsed. rotation, so the washing time can be shortened.

The gist of the drum-type washing machine according to the tenth aspect of the present invention is that it includes: a first load judging device for judging the load in the rotating drum before washing starts; The load in the rotating drum; the water content calculation means calculates the water content of the laundry based on the two loads determined by the first and second load determination means; The moisture content detected by the device predicts the drying time.

As the tenth aspect of the present invention, since the water content of the laundry is calculated based on the load determined before the start of washing and the load determined after a predetermined time elapses in the dehydration process, and the drying time is predicted based on the water content, it can be clearly known Drying end time.

In addition, the main points of the drum-type washing machine according to the eleventh aspect of the present invention include: a first load judging device for judging the load in the rotating drum before washing starts; load in the drum; and dehydration time changing means for changing the dehydration time based on both loads determined by said first and second load determination means.

As the eleventh solution of the present invention, since the dehydration time is changed according to the load determined before the start of washing and the load determined during the dehydration process, it is not affected by the cloth quality of the laundry and the water temperature, and the optimum dehydration time can be used. Dehydrate evenly.

Furthermore, the gist of the drum-type washing machine according to the twelfth aspect of the present invention is that, in the eleventh aspect of the present invention, it is equipped with: a repetitive control device, which controls the second load judging device so as to repeatedly judge the load during the dehydration process. load in the rotating drum; and dehydration time control means for controlling the dehydration time so that the dehydration rate reaches a predetermined value according to the load repeatedly determined by the second load determination means through the control of the repetitive control means.

As the twelfth solution of the present invention, since the load in the rotating drum is repeatedly determined in the dehydration stroke, the dehydration time is controlled according to the repeatedly determined load, so that the dehydration rate reaches a predetermined value, so it is not affected by the cloth quality of the laundry and Due to the influence of water temperature, it is possible to dehydrate evenly with the optimal dehydration time.

The gist of the drum-type washing machine of the thirteenth aspect of the present invention is that, in the twelfth aspect of the present invention, it is equipped with: a dehydration rate setting device for setting a desired dehydration rate; and a dehydration time adjustment device for controlling The control of the device is to adjust the dehydration time according to the load repeatedly determined by the second load determination means, so that the dehydration rate reaches the desired dehydration rate set by the dehydration rate setting means.

As the thirteenth aspect of the present invention, since the desired dehydration rate is set, the dehydration time is adjusted according to the load repeatedly determined by the load determination device to achieve the set desired dehydration rate, so the dehydration state required by the user can be achieved.

Fig. 1 is a block diagram showing the circuit structure of a control section of a front-loading washing machine according to an embodiment of the present invention.

Fig. 2 is a graph showing the relationship between the moment of inertia and the laundry load.

Fig. 3 is a flow chart showing the operation of the front-loading washing machine shown in Fig. 1 .

FIG. 4 is a graph showing the relationship between rotation speed and time for explaining the method of calculating the rotational angular acceleration during motor acceleration and the rotational angular acceleration during the deceleration state in which the power supply to the motor is cut off and in the free rotation state.

FIG. 5 is a graph showing changes in angular acceleration and measurement timing at the time of overcapacity.

FIG. 6 is a graph showing an example of time shortening of a load determination stroke.

Fig. 7 is a graph showing another example of time shortening of the load amount judging stroke.

Fig. 8 is a diagram showing load determination processing in a dehydration process.

Fig. 9 is a flowchart showing the processing for calculating the predicted drying time.

10 is a graph showing the relationship between rotational speed and time for explaining another method of calculating the rotational angular acceleration during motor acceleration and the deceleration state in the free rotation state in which the power supply to the motor is cut off.

Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a block diagram showing the circuit configuration of a control section of a front-loading washing machine according to an embodiment of the present invention. The control part shown in the figure is equipped with: control circuit 1, which controls the overall action; motor 3, which drives the rotating drum; drive circuit 5, which drives the motor 3 according to the control of control circuit 1; Hall IC7 (Hall IC), Detect the rotational speed of the motor 3, and provide the detected rotational speed to the control circuit 1; the water supply valve 9 controls the water supply to the washing tank; the driving circuit 11 drives the water supply valve 9 according to the control of the control circuit 1; the drain valve 13 controls Drainage of water in the washing tank; drive circuit 15, which drives the drain valve 13 according to the control of control circuit 1; water level sensor 17, detects the water level in the washing tank; display 19, performs various displays including alarm display; and various The switch 21 includes a power switch, a start switch, and the like.

In the drum-type washing machine of this embodiment, in order to avoid the influence of torque loss in the conventional method of measuring the above-mentioned amount of laundry, if the rotational angular acceleration dω /dt is (dω/dt)s, and the rotational angular acceleration dω/dt during deceleration is (dω/dt)e, and the rotational angular velocity ω of these two rotational angular accelerations is roughly equal, then from formula (1), ( 2) The moment of inertia I _CL of the laundry is given by $I_{\mathrm{CL}}=\frac{T}{2((\mathrm{d\ω}/\mathrm{dt})\mathrm{the\; s}+(\mathrm{d\ω}/\mathrm{dt})e)}+\frac{I_B}{2}$

The torque loss T _L that is a conventional error factor can be eliminated by obtaining it.

That is, if the rotational angular acceleration S1 (=(dω/dt)s) and the rotational angular acceleration S2 (=(dω/dt)e) during deceleration of the rotating drum or the motor driving the rotating drum are obtained, Since the moment of inertia I _CL of the laundry can be accurately calculated from the formula (4), the amount of laundry as the load can be obtained from the moment of inertia I _CL with reference to the load detection characteristic shown in FIG. 2 .

Next, referring to the flow chart shown in FIG. 3, the function of the embodiment shown in FIG. 1 will be described.

Starting from putting in the laundry, if the start switch included in the various switches 21 provided on the main body is operated, then according to the flow shown in FIG. Perform washing, rinsing and spinning cycles.

In the load amount judgment process shown in Figure 3, at first the acceleration time determination flag F1 and the deceleration time determination flag F2 are initialized to 0 (step 110), in addition, check whether the motor rotation state flag fm representing the motor rotation state is 0 ( Step 120). In addition, the motor rotation state flag fm is set to '0' during motor acceleration, and is set to '1' during deceleration.

Now, if the motor is accelerating, since the motor rotation status flag fm is 0, it goes to step 130 and sets 3000rpm and 4000rpm as detected rotation speeds as ω1 and ω2, respectively.

In addition, FIG. 4 shows the rotational speed of the motor with respect to time, but the detected rotational speeds of 3000 rpm and 4000 rpm during acceleration are represented by ω1 and ω2 during rotational speed increase in FIG. 4 .

Subsequently, read in the rotation speed NN of the motor (step 150), and check whether the rotation speed NN is equal to the detected rotation speed ω1 (3000 rpm) (step 160). When the rotation speed NN of the motor reaches the detected rotation speed ω1 (3000 rpm), measurement of the time from the rotation speed ω1 to ω2 is started (step 170 ). Next, read the rotation speed NN of the motor again (step 180), and check whether the rotation speed NN is equal to the detected rotation speed ω2 (step 190). When the motor rotation speed NN is equal to the detected rotation speed ω2, the time measurement is terminated, and the acceleration time Δt1 for the motor rotation speed NN to reach ω2 from ω1 to ω2 is calculated (step 200 ).

Then, check whether the motor rotation state flag fm is 0, that is, check whether the motor is accelerating (step 210). Since the current processing is being accelerated, the process proceeds to step 230, and the measured time Δt1 is set as the acceleration time T1. Then, the acceleration time determination flag F1 is set to 1, indicating that the acceleration time is determined (step 240).

Determine the acceleration time T1, if the acceleration time determination flag F1 is set to 1, check whether the acceleration time determination flag F1 and the deceleration time determination flag F2 are 1 at the same time (step 250). Now, because the deceleration time determination flag F2 is not yet 1, so enter step 260, enter the deceleration action by setting the motor rotation state flag fm to 1, stop the power supply to the motor, make the rotating drum in a free rotation state, and return to step 120 (step 270). As a result, the motor starts to decelerate, and its rotational speed starts to decrease as shown in FIG. 4 .

In the state where the rotational speed starts to decrease, in step 120, it is checked whether the motor rotation state flag fm is 0 or not. Since the motor is decelerating, the flag fm is 1, so proceed to step 140, and set 4000rpm and 3000rpm as detected rotation speeds as ω1 and ω2, respectively.

Subsequently, the rotational speed NN of the motor is read (step 150), and it is checked whether the rotational speed NN during deceleration is equal to the detected rotational speed ω1 (4000 rpm) (step 160). When the rotation speed NN of the motor reaches the detected rotation speed ω1 (4000 rpm), measurement of the time from the rotation speed ω1 (4000 rpm) to ω2 (3000 rpm) is started (step 170 ). Read in the rotation speed NN of the motor again (step 180), and check whether the rotation speed NN is equal to the detected rotation speed ω2 (step 190). When the motor rotation speed NN is equal to the detected rotation speed ω2, the time measurement is terminated, thereby calculating the deceleration time Δt2 from the rotation speed NN of the motor to ω2 (3000 rpm) from ω1 (4000 rpm) to ω2 (3000 rpm) during deceleration (step 200 ).

Subsequently, it is checked whether the motor rotation state flag fm is 0 (step 210). Since it is decelerating and it is 1, it proceeds to step 280 and sets the measured time Δt2 as the deceleration time T2. Then, the deceleration time determination flag F2 is set to 1, indicating that the deceleration time is determined (step 290).

Determine the deceleration time T2, if the deceleration time determination flag F2 is set to 1, check whether the acceleration time determination flag F1 and the deceleration time determination flag F2 are both 1 (step 250). Since both the acceleration time determination flag F1 and the deceleration time determination flag F2 are 1, the process proceeds to step 330, and the moment of inertia I _CL is calculated according to the above formula (4) (step 330).

That is to say, as mentioned above and shown in Fig. 4, according to the difference Δω(=ω1-ω2) between the acceleration time Δt1 of the motor rotation speed rising from ω1 (3000rpm) to ω2 (4000rpm) and the rotation speed when the motor is accelerating, the motor The first rotational angular acceleration S1 (=(dω/dt)s) during acceleration, in addition, according to the difference Δω( ω1-ω2), calculate the second rotational angular acceleration S2 (=(dω/dt)e) when the motor decelerates, and then use these first rotational angular acceleration S1 (=(dω/dt)s) and the second rotational angular acceleration S2 (=(dω/dt)e), calculates the moment of inertia I _CL of the laundry by the calculation of the formula (4).

If the moment of inertia I _CL of the laundry is calculated, the amount of laundry as a load can be obtained from the moment of inertia according to the load detection characteristic shown in FIG. , Washing, cleaning and dehydration strokes.

In the above processing, when the time Δt1 taken for the rotation speed to increase from ω1 (3000rpm) to ω2 (4000rpm) is longer than the preset predetermined time Δts during the increase of the rotation speed of the motor, the amount of laundry to be input is determined. Too much, stop the rotation of rotary drum, carry out warning display on the display 19 of washing machine main body control panel, carry out alarm with buzzer simultaneously. In addition, in the deceleration of the rotary drum or the motor, if the time Δt2 taken for the rotation speed to decrease from ω1 (4000rpm) to ω2 (3000rpm) is longer than the preset predetermined time Δte, it is determined that the amount of laundry thrown in is too much , stop the rotation of rotary drum, carry out warning display on the display 19 of washing machine main body control panel, carry out alarm (referring to Fig. 5) with buzzer simultaneously.

In addition, in the above process, during the acceleration of the motor, as shown in FIG. 6, when the rotation speed of the rotary drum reaches ω2, the power supply to the drive motor is stopped, and the load can be shortened by moving to the deceleration stroke shown by the solid line. Quantitative judgment processing time.

Furthermore, after the stroke of finding the amount of laundry is over, specifically, when the motor speed drops to 3000rpm when the motor decelerates, the water supply valve 9 is activated to start directly supplying water to the rotary tank of the washing machine, as shown in Figure 7. By operating the brake, the rotation of the drum can be stopped, and the water supply can be completed when the predetermined water level is reached, and then move to the washing process. Furthermore, although it is not shown in the figure in this embodiment, an electromagnetic brake circuit for generating a braking effect is provided in the motor by short-circuiting the motor windings. Furthermore, when the rotation speed of the motor is reduced to 3000 rpm or less during the deceleration operation of the motor, the electromagnetic brake is activated to quickly stop the rotation of the motor, thereby shortening the load determination processing time. The brake device is not limited to an electromagnetic brake, but may be a mechanical brake. In addition, when the brake acts, it not only acts on the rotation speed, but also acts after a predetermined time elapses after entering the deceleration stroke.

In addition, in the embodiment, since the water supply can be started before the rotation of the rotary tank stops when the motor is decelerated, the time to start washing can be shortened, and the overall operation time of the washing machine can be shortened.

In the above-mentioned embodiment, washing and washing processes are carried out, and after a predetermined time elapses from entering the dehydration process, the amount of laundry is detected again, thereby measuring the water content in the dehydration process during the dehydration load determination process shown in FIG. 8 . By comparing the amount of laundry with the amount of laundry in a dry state that does not include the moisture before washing, the amount of moisture contained in the laundry can be calculated, and thus the dehydration rate of the laundry can be obtained. That is, by performing load determination processing in the dehydration process, it is possible to detect the water content of the laundry, in other words, to detect the dehydration rate. Usually, the dehydration time is set to 10 minutes, so that the dehydration rate reaches approximately 55%. However, the dehydration rate varies greatly in practice due to the type, quantity, and water temperature of the load.

In the present embodiment, the load judging course is performed after a predetermined time, for example, 3 minutes, after the dehydration starts. The load amount detected at this time is the sum of the amount of cloth and the amount of moisture contained in the cloth. Therefore, the dehydration amount at this time can be calculated from this load amount and the load amount determined before washing.

Table 1 shown below shows the relationship between the dehydration rate 3 minutes after the start of dehydration and the remaining dehydration time until the dehydration rate reaches 55% obtained in the preliminary experiment. Based on this relationship, the remaining dehydration time can be determined.

【Table 1】 Dehydration rate calculated after dehydration for 3 minutes Spin remaining time 48% or less 8 minutes From 48 to 52% 5 minutes From 52 to 55% 2 minutes 55% or more 0

For example, the amount of cloth is 3kg, if the judgment result after 3 minutes is 6.3kg, and the dehydration rate is calculated to be 48%, according to Table 1, the remaining time of dehydration is set to 8 minutes. In addition, the amount of cloth is 3kg. If the judgment result after 3 minutes is 5.8kg, the dehydration rate is calculated to be 51.5%. Considering that it is a chemical fiber cloth that is easy to dehydrate, the dehydration time should be shorter in this case. According to Table 1, dehydration The remaining time is set to 5 minutes. By judging the load in spinning in this way, the spinning time can be changed to perform optimum spinning for each fabric. In addition, it is not limited to the data shown in Table 1, and more subdivided reference data may also be used.

Furthermore, in the present embodiment, it is not based on the data in the above-mentioned Table 1, but is determined according to the load during dehydration. When it is determined that the dehydration rate does not meet the target 55%, the predetermined time can also be extended, such as extending the dehydration by 1 minute. time. Then, the determination of the load and the extension of the dehydration time are repeated, so that the determination of the load is performed again, and the dehydration is completed. By judging the amount of load in dehydration, the dehydration time can be automatically controlled, so that uniform dehydration can be performed with the optimal dehydration time without being affected by the fabric quality, water temperature, and the like. Also, with this structure, it is not necessary to prepare a lot of reference data.

In addition, in this embodiment, there are weak dehydration programs and strong dehydration programs corresponding to the situation where strong dehydration is desired instead of strong dehydration. In the weak dehydration program, the dehydration rate is set to 50%, for example, In the strong dehydration program, the dehydration rate is set at, for example, 60%, and the dehydration time is variably controlled according to the determination of the load to achieve a predetermined dehydration rate corresponding to the selected dehydration program, thereby suppressing the dispersion of the dehydration rate.

Furthermore, in this embodiment, there is a device capable of setting the dehydration rate in the operation part, so that the user can arbitrarily set the dehydration rate corresponding to the cloth. Moreover, the dehydration time is controlled, and the dehydration rate setting device is used to achieve the set dehydration rate, so as to achieve the dehydration state desired by the user.

In this embodiment, in the case of a drum-type washing machine with a drying function, at the end of the dehydration process, by performing the above-mentioned load determination process, since the amount of laundry and the amount of moisture to be dried are known, the drying time can be predicted. , the predicted drying time or operation end time can be displayed.

This processing will be described with reference to the flowchart shown in FIG. 9 . In FIG. 9 , first, the load judgment process is performed before the washing as described above, and the judgment result is set as the load L1 in the dry state before washing (steps 510, 520). Subsequently, the washing process and cleaning process (steps 530, 540) are performed, and the dehydration process is started (step 550). In the dehydration stroke, the motor continues to spin for a predetermined time (step 560), and then the motor is decelerated, and the motor rotation state flag fm is set to 1 (step 570). And, in this state, a load judgment trip is performed (step 580), and the judgment result is set as the load amount L2 (step 590). The water content contained in the laundry is calculated by subtracting the load L1 from the load L2 (step 600). According to this water content, set drying prediction time (step 610), display this drying prediction time as mentioned above, carry out drying process, finish dehydration after passing this drying prediction time (step 620).

In addition, in the case of selecting a program from washing to washing, dehydration, and drying, since the drying capacity is half of the washing capacity, if it is judged by the load judging process that the drying capacity exceeds the maximum capacity, the excess washing capacity must be taken out. Therefore, the feed water after load judgment processing is not performed. When the drying capacity is determined to be equal to or less than the maximum drying capacity, water supply can be started before the rotation of the rotary tank is stopped after the load determination process.

In the above-mentioned embodiment, according to the time Δt1 during which the rotational speed of the motor increases from 3000rpm to 4000rpm and the time Δt2 during which it decreases from 4000rpm to 3000rpm, the calculation of the rotational angular acceleration during acceleration and deceleration in steps 130-280 of FIG. 3 is performed, but instead It is also possible to obtain the rotational angular acceleration as shown in FIG. 10 from the change of the angular velocity within a predetermined timing.

In other words, as shown in Figure 10, when the motor speed reaches the set speed ω (3000rpm) during the increase in the speed of the motor, time measurement is started, and the speed ω1 after the predetermined set time Δt is measured to calculate The change in rotational speed Δωs (=ω1−ω) during this set time Δt. Subsequently, the motor moves to the deceleration stroke, and if the rotational speed reaches ω1, time measurement is performed again, and the rotational speed ω2 after the predetermined set time Δt is measured, and the change Δωe (=ω1-ω2) of the rotational speed during the set time Δt is calculated. Then, from the angular velocity change Δωs during acceleration and the angular velocity change Δωe during deceleration calculated in this way, the rotational angular acceleration during acceleration and deceleration is calculated, and this is substituted into equation (4) to obtain the moment of inertia I _CL of the laundry. Moment, the load amount can be obtained from this moment of inertia from FIG. 2 .

Furthermore, the rotational speed calculated in the above-mentioned embodiment is not limited to the rotational speed of the motor, it can also be the rotational speed of the rotating drum driven by the motor, etc., mainly driven by the motor, if it is proportional to the rotational speed of the motor, it is better.

As described above, according to the present invention, since the first rotational angular acceleration during acceleration is calculated, the second rotational angular acceleration during deceleration in the free-rotating state after the power supply to the motor is cut off is calculated at the same time. Acceleration determines the amount of laundry as the load, so the load, that is, the amount of laundry, can be accurately measured without being affected by torque loss fluctuations as in the past.

In addition, according to the present invention, since during the deceleration of the free rotation state in which the power supply to the motor is cut off, if the rotation speed does not decelerate from the second predetermined rotation speed to the first predetermined rotation speed within a specified time, a warning is issued. If the rotational speed does not accelerate from the first predetermined rotational speed to the second predetermined rotational speed within a predetermined time, a warning is issued, so it can be known that too much laundry has been put in, and proper washing can be performed.

Furthermore, according to the present invention, since the determination of the load is performed before the start of washing, and after the determination of the load is completed, the water supply to the rotary tank is started before the rotation of the rotary drum is stopped, so the time until the start of washing can be shortened. As a result, the overall washing time can be shortened.

According to the present invention, since water supply to the rotary tank is started when the determined load is equal to or less than a predetermined value, appropriate washing can be performed.

In addition, according to the present invention, since the power supply to the motor is directly cut off after the first rotational angular acceleration is calculated, and the rotary drum is set to a deceleration state in a free-rotation state, the load determination processing time is shortened, and the entire washing process can be shortened. time.

Furthermore, according to the present invention, in the deceleration state of the free-rotation state of the rotating drum, which cuts off the power supply to the motor, when the rotation speed is lower than the predetermined rotation speed or when a predetermined time has elapsed, the rotation of the motor is forcibly stopped. The washing time can be shortened, so that the entire washing time can be shortened.

According to the present invention, since the moisture content of the laundry is calculated based on the load determined before the start of washing and the load determined after a predetermined time elapses in the dehydration process, and the drying time is predicted based on the moisture content, the drying end time can be clearly known.

In addition, according to the present invention, since the dehydration time is changed according to the load determined before the start of washing and the load determined during the dehydration process, it is not affected by the cloth quality of the laundry and the water temperature, and the dehydration time can be uniformly dehydrated with the optimum dehydration time. Dehydrate.

Furthermore, according to the present invention, since the load in the rotating drum is repeatedly determined in the dehydration stroke, the dehydration time is controlled, and the dehydration rate reaches a predetermined value according to the repeatedly determined load, so it is not affected by the cloth quality of the laundry and the water temperature. The effect of the dehydration can be dehydrated evenly with the best dehydration time.

According to the present invention, since a desired dehydration rate is set, and the load judging means adjusts the dehydration time according to the repeatedly determined load to reach the set desired dehydration rate, the dehydration state desired by the user can be achieved.

Claims (13)

1. A drum-type washing machine, characterized in that it comprises: a rotating speed detection device, which detects the rotating speed of the rotating drum or the rotating speed of the motor driving the rotating drum; the first rotational angular acceleration calculating device, calculates The first rotational angular acceleration in the vicinity of the set rotational speed in the acceleration of the rotating drum; the second rotational angular acceleration calculation means, according to the rotational speed detected by the rotational speed detection means, calculates the free rotation state of the rotational drum in which the power supply of the motor is cut off a second rotational angular acceleration around a set rotational speed during deceleration; and load amount judging means for judging a load amount in the rotary drum based on the first and second rotational angular accelerations. 2. The drum type washing machine according to claim 1, characterized in that, according to the acceleration time of accelerating from the first predetermined rotational speed to the second predetermined rotational speed from the rotational speed detected by the rotational speed detection device during the acceleration of the motor and the first and the difference between the second preset rotation speed, the first rotation angular acceleration calculation device calculates the first rotation angular acceleration; according to the rotation speed detected by the rotation speed detection device in the deceleration in the free rotation state of cutting off the power supply of the motor from the second predetermined rotation speed The second rotational angular acceleration calculating means calculates the second rotational angular acceleration according to the difference between the deceleration time for the rotational speed to decelerate to the first predetermined rotational speed and the first and second predetermined rotational speeds. 3. The drum type washing machine according to claim 1, characterized in that, according to the change in the rotational speed detected by the rotational speed detection means in the acceleration of the motor from the first predetermined rotational speed within a predetermined time and the predetermined time, The first rotational angular acceleration calculation means calculates the first rotational angular acceleration; according to the change in the rotational speed detected by the rotational speed detection means from the second predetermined rotational speed within a predetermined time in the deceleration of the free rotation state in which the power supply to the motor is cut off The second rotational angular acceleration calculation device calculates the second rotational angular acceleration according to the change in rotation speed and the predetermined time. 4. The drum-type washing machine according to claim 2 or 3, characterized in that it is equipped with a warning device, and during the deceleration of the free rotation state in which the power supply of the motor is cut off, the rotation speed detected by the rotation speed detection device is changed from the When the second predetermined rotational speed does not decelerate to the first predetermined rotational speed within a predetermined time, a warning is issued. 5. The drum-type washing machine according to claim 2 or 3, characterized in that it is equipped with a warning device, and during the acceleration of the motor, the rotation speed detected by the rotation speed detection device is within a specified range from the first predetermined rotation speed. If the speed is not accelerated to the second predetermined speed within a certain period of time, a warning is issued. 6. The drum-type washing machine as claimed in claim 1, characterized in that, a water supply start device is provided, and since said load judging device judges the load before washing starts, the load judging device ends the determination of the load. After the determination process, the water supply to the rotary tank is started before the rotation of the rotary drum stops. 7. The drum type washing machine according to claim 1, further comprising water supply start means for starting water supply to the rotary tank when the load determined by said load determination means is below a predetermined value. 8. The drum-type washing machine according to claim 1, characterized in that it is provided with a deceleration state setting device, and after said first rotational angular acceleration calculating device calculates said first rotational angular acceleration, it immediately cuts off said first rotational angular acceleration. The power supply of the motor sets the rotary drum to the deceleration state of the free rotation state. 9. The drum-type washing machine according to claim 1, characterized in that it is equipped with a brake device, and in the deceleration state of the rotating drum free rotation state in which the power supply of the motor is cut off, at the speed detected by the speed detection device The rotation of the motor is forcibly stopped when the rotational speed is lower than a predetermined speed or when a predetermined time has elapsed. 10. A drum-type washing machine, characterized in that it comprises: a first load judging device for judging the load in the rotating drum before washing starts; The load in the drum; the water content calculation means, calculates the water content of the laundry according to the two loads determined by the first and second load determination means; and the drying time prediction means, based on the water content detection means Detects moisture content, predicts drying time. 11. A drum-type washing machine, characterized in that it comprises: a first load judging device for judging the load in the rotating drum before washing starts; a second load judging device for judging the load in the rotating drum during the dehydration process amount; and dehydration time changing means for changing the dehydration time according to the two loads determined by the first and second load determination means. 12. The drum-type washing machine according to claim 11, characterized in that it is equipped with: a repetitive control device for controlling the second load judging device so as to repeatedly judge the load in the rotating drum during the dehydration stroke; and dehydration The time control means controls the dehydration time so that the dehydration rate reaches a predetermined value according to the load repeatedly determined by the second load determination means under the control of the repetition control means. 13. The drum-type washing machine as claimed in claim 12, characterized in that it is equipped with: a dehydration rate setting device for setting a desired dehydration rate; The second load judging device repeatedly judges the load, adjusts the dehydration time, and makes the dehydration rate reach the desired dehydration rate set by the dehydration rate setting device.

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