KR100320667B1 - Drum washing machine - Google Patents

Abstract

The present invention relates to a drum type washing machine capable of accurately measuring a load amount of laundry placed in a rotating drum, wherein the acceleration time until the rotational speed of the motor accelerates from the first predetermined rotational speed 3000rpm to the second predetermined rotational speed 4000rpm (Δ deceleration from the second predetermined rotational speed 4000 rpm to the first predetermined rotational speed 3000 rpm during the deceleration of the free rotation state in which t1) is measured (steps 130 to 230), and then the energization to the motor is stopped. The time Δt2 is measured (steps 140 to 290), and the rotational angular acceleration at the time of acceleration and deceleration is calculated based on the difference between the measured acceleration time Δt1 and the deceleration time Δt2 and the rotation speed. By calculating and calculating the inertia moment of the laundry on the basis of the rotational angular acceleration (step 330), and calculating the amount of laundry from the moment of inertia, the amount of load put into the rotating drum can be measured accurately and in a short time. It is characterized in that to provide a drum type washing machine.

Description

Drum-type washing machine {DRUM WASHING MACHINE}

The present invention relates to a drum type washing machine capable of accurately measuring the load amount, which is the amount of laundry put in a rotating drum.

In the conventional drum type washing machine, the moment of inertia when the rotating drum containing laundry is rotated is measured, and the amount of laundry, i.e., the load of the rotating drum, is calculated by using the moment of inertia proportional to the amount of washing.

More specifically, the equation of motion of the rotary coordinate system at the time of acceleration and deceleration of the rotating drum is given by the following equations (1) and (2), respectively.

Here, "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 viscosity coefficient of the air when the rotating drum is rotating , "T" is the drive torque of the rotating drum, "T _L " is the loss of torque.

The moment of inertia (I _CS ) of the laundry in the equation of acceleration during acceleration shown in Equation (1) is expressed by the following equation.

When the moment of inertia of laundry is calculated in this equation, the amount of laundry can be obtained from the moment of inertia.

As described above, in the conventional method of calculating the inertia moment of a laundry in Equation 3 and calculating the amount of laundry from the moment of inertia, when the torque loss T _L fluctuates, even if the same amount of laundry is used, When the rise is fluctuating and the torque loss is large, the amount of laundry is calculated to be larger than the actual value, and when the torque loss is small, the amount of laundry is small.

The torque loss is constituted by a loss due to vibration due to the deflection of the laundry in addition to a fixed loss such as a bearing loss or a transmission loss of the torque transmission belt, but the fluctuation of the torque loss is a change due to a time factor of the fixed loss, namely It is caused by the difference between the fixed loss at the time of shipment of the product and the fixed loss at the end of the service period, the change due to the change of the belt tension due to the temperature change of the torque transmission belt, and the difference in the weight of the laundry. . Since torque loss always fluctuates like this, there is a problem that it is difficult to accurately determine the amount of laundry by the conventional method.

In addition, when the load is input to the drum type washing machine more than the rated load or when the load in the dewatering tank is unbalanced, it takes time to accelerate the dewatering tank to a predetermined rotational acceleration, so it takes time to measure the amount of laundry. There is also a problem.

The present invention has been made in view of the above problems, and an object thereof is to provide a drum type washing machine capable of accurately and in a short time measuring the amount of load put into a rotating drum.

1 is a block diagram showing a circuit configuration of a controller of a drum type washing machine according to an embodiment of the present invention;

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

3 is a flowchart showing the action of the drum type washing machine shown in FIG.

4 is a graph showing the rotational speed with respect to time for explaining the method of calculating the rotational angular acceleration during acceleration of the motor and the rotational angular acceleration during deceleration in the free rotation state in which the motor is energized.

5 is a graph showing a change in angular acceleration and measurement timing when a capacity is over;

6 is a graph showing an example of time reduction of a load determination stroke;

7 is a graph showing another example of time reduction of the load determination stroke;

8 is a diagram showing a load amount determination process during a dehydration stroke;

9 is a flowchart showing a process of calculating a drying prediction time;

10 is a graph showing the number of revolutions with respect to time for explaining another method of calculating the angular acceleration during acceleration of the motor and the rotational angular acceleration during deceleration in the free rotation state in which the motor is energized.

* Explanation of symbols for main parts of the drawings

1: control circuit 3: motor

7: Hall IC 9: Water Supply Valve

13: Drain valve 17: Water level sensor

19: Indicator 21: Switch

In order to achieve the above object, the present invention of the first aspect provides a rotation speed detecting means for detecting the rotation speed of a rotating drum or the rotation speed of a motor for driving a rotating drum, and the rotation based on the rotation speed detected by the rotation speed detecting means. Free rotation state of the rotating drum which cuts off electricity to the motor on the basis of the rotation speed detected by the first rotation angular acceleration calculating means for calculating the first rotation angular acceleration near the set rotation speed during the drum acceleration. The second aspect of the present invention has a second rotation angular acceleration calculating means for calculating a second rotational angular acceleration in the vicinity of a set rotational speed and a load amount determining means for determining the load amount in the rotating drum based on the first and second rotational angular accelerations. .

In the present invention of the first aspect, the first rotational angular acceleration during acceleration is calculated, and the second rotational angular acceleration is calculated during the deceleration of the free rotation state after the energization to the motor is stopped, and the first and second rotational angular accelerations are calculated. Since the amount of laundry which is a load amount is determined based on the above, the load amount can be determined accurately without being affected by the fluctuation of torque loss as in the prior art.

In the invention of the second aspect, in the invention of the first aspect, the rotation speed detected by the rotation speed detection means by the first rotation angular acceleration calculating means is the second predetermined speed from the first predetermined rotation speed during the acceleration of the motor. The first rotational angular acceleration is calculated based on the acceleration time until acceleration to the rotational speed and the difference between the first and the second predetermined rotational speeds, and the second rotational angular acceleration calculating means freely rotates the electric power to the motor. During the deceleration of the state, based on the deceleration time until the rotation speed detected by the rotation speed detecting means decreases from the second predetermined rotation speed to the first predetermined rotation speed and the difference between the first and second predetermined rotation speeds, The main point is to calculate the second rotational angular acceleration.

In the present invention of the second aspect, the first rotational angular acceleration is calculated based on the acceleration time until the rotation speed accelerates from the first predetermined rotation speed to the second predetermined rotation speed and the difference between the first and second predetermined rotation speeds. On the basis of the difference between the deceleration time until the rotational speed decelerates from the second predetermined rotational speed to the first predetermined rotational speed and the first and second predetermined rotational speeds during the deceleration of the free rotation state in which the motor is energized. The second rotational angular acceleration is calculated.

Further, in the invention of the third aspect, in the invention of the first aspect, the rotation speed detected by the rotation speed detection means is changed within the predetermined time from the first predetermined rotation speed by the first rotation angular acceleration calculation means during acceleration of the motor. The first rotational angular acceleration is calculated on the basis of the change in rotational speed and the predetermined time, and the second rotational angular acceleration calculating means is detected by the rotational speed detection means during the deceleration of the free rotation state in which power to the motor is cut off. It is a summary that the second rotational angular acceleration is calculated on the basis of the change in the rotational speed in which one rotational speed changes within a predetermined time from the second predetermined rotational speed.

In the present invention of the third aspect, the first rotational angular acceleration is calculated on the basis of the change in rotational speed and the predetermined time at which the rotational speed changes from the first predetermined rotational speed, and in the free rotation state in which power is not supplied to the motor. During deceleration, the second rotational angular acceleration is calculated on the basis of the change in the rotational speed and the predetermined time at which the rotational speed changes from the second predetermined rotational speed.

The invention of the fourth aspect is the invention of the second or third aspect, wherein the rotation speed detected by the rotation speed detecting means is decelerated at the second predetermined rotation speed during the deceleration of the free rotation state in which power supply to the motor is stopped. It is a main idea to have a warning means for giving a warning in the case of not decelerating to said 1st predetermined rotation speed within a prescribed time.

In the present invention of the fourth aspect, since the warning is issued when the rotation speed does not decelerate from the second predetermined rotation speed to the first predetermined rotation speed within the prescribed time during the deceleration in the free rotation state in which the power supply to the motor is cut off, You can see that there is too much laundry.

The invention of the fifth aspect is the invention of the second or third aspect, wherein the rotation speed detected by the rotation speed detecting means during acceleration of the motor is within the specified time at the first predetermined rotation speed. It is essential to have a warning means for giving a warning in case of not accelerating to a predetermined rotational speed.

In the present invention of the fifth aspect, it is understood that too much laundry is introduced because the warning is issued when the rotation speed does not accelerate from the first predetermined rotation speed to the second predetermined rotation speed within the prescribed time during acceleration of the motor. .

Further, in the invention of the sixth aspect, in the invention of the first aspect, the determination of the load amount by the load amount determining means is carried out before the start of washing, and after the end of the load amount determination process by the load amount determining means, the rotation of the rotating drum is performed. It is a main point to have a water supply start means for starting a water supply to a rotary tank before stopping.

In the present invention of the sixth aspect, determination of the load amount is carried out before the start of washing, and after completion of the load determination process, water supply is started in the rotating tank before rotation stop of the rotating drum, so that the time until the start of washing can be shortened.

This invention of a 7th aspect makes it a summary for the invention of a 1st aspect to have water supply start means which starts water supply to a rotating tank, when the load amount determined by the said load amount determination means is below a predetermined value.

In the present invention of the seventh aspect, when the load amount determined by the load determination means is equal to or less than the predetermined value, water supply is started in the rotating tub, and thus, proper washing can be performed.

In the invention of the eighth aspect, in the invention of the first aspect, after the first rotational angular acceleration calculating means calculates the first rotational angular acceleration, the energization to the motor is immediately stopped, and the rotating drum is free-rotated. It is an essential point of the present invention to have a deceleration state setting means for setting to a deceleration state of.

In the present invention of the eighth aspect, after the first rotational angular acceleration is calculated, the energization to the motor is immediately stopped, and the rotating drum is set to the deceleration state of the free rotation state, so that the time of the load determination process can be shortened.

In the invention of the ninth aspect, the rotation speed detected by the rotation speed detecting means is equal to or less than the specified rotation speed in the deceleration state of the free rotation state of the rotating drum which has cut off the power supply to the motor. The present invention is intended to have a braking means for forcibly stopping the rotation of the motor when the temperature decreases or when a predetermined time elapses.

According to the ninth aspect of the present invention, the rotation of the motor is forcibly stopped when the rotation speed drops below the prescribed rotation speed or when a predetermined time elapses in the deceleration state of the free rotation state of the rotating drum which has cut off the power supply to the motor. Therefore, the washing time can be shortened.

According to a tenth aspect of the present invention, there is provided a first load amount determining means for determining a load amount in a rotating drum before starting washing, second load amount determining means for determining a load amount in a rotating drum after a predetermined time elapses during the dehydration stroke, and the first and second loads. It is a main point of the present invention to have a water content calculating means for calculating a water content of laundry based on both load amounts determined by the load amount determining means and a drying time predicting means for predicting a drying time based on the water content detected by the water content detecting means.

In the present invention of the tenth aspect, the drying time is calculated based on the load amount determined before the start of washing and the load amount determined after a predetermined time elapses during the dehydration stroke, and the drying time is predicted based on the water content. You can know exactly.

In addition, the present invention of the eleventh aspect provides first load determination means for determining the load amount in the rotating drum before starting washing, second load determination means for determining the load amount in the rotating drum during the dewatering stroke, and the first and second load determination. The main point is to have a dehydration time changing means for changing the dewatering time based on both loads determined by the means.

In the present invention of the eleventh aspect, the dehydration time is changed based on the load amount determined before the start of washing and the load amount determined during the dehydration stroke, so that it is not affected by the quality of the cloth or the water temperature of the laundry and is uniform at the optimum dewatering time. Can be dehydrated.

Further, according to the twelfth aspect of the present invention, in the eleventh aspect of the present invention, there is provided a repetitive control means for controlling the second load amount determining means so as to repeatedly determine the load amount in the rotating drum during the dewatering stroke; It is therefore essential to have a dehydration time control means for controlling the dehydration time so that the dehydration rate becomes a predetermined value based on the load amount repeatedly determined by the second load amount determining means.

In the present invention of the twelfth aspect, the amount of load in the rotating drum is repeatedly determined during the dehydration stroke, and the dehydration time is controlled so that the dehydration rate becomes a predetermined value based on the repeatedly determined load amount, so that It can be dehydrated uniformly with the optimum dehydration time without being affected.

According to a thirteenth aspect of the present invention, in the twelfth aspect of the present invention, there is provided a dehydration rate setting means for setting a desired dehydration rate, and control of the repetition control means such that the dehydration rate is a desired dehydration rate set in the dehydration rate setting means. It is a summary that the second load amount determining means has dewatering time adjusting means for adjusting the dewatering time based on the load amount repeatedly determined.

In the present invention of the thirteenth aspect, the dehydration state desired by the user can be achieved because the dehydration time is adjusted based on the load amount repeatedly determined by the load quantity determining means so as to set the desired dehydration rate and to the set desired dehydration rate. .

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described using drawing.

1 is a block diagram showing a circuit configuration of a controller of a drum type washing machine according to one embodiment of the present invention. The control part shown in this figure is the control circuit 1 which controls the whole operation, the motor 3 which drives a rotating drum, and the drive circuit 5 which drives the said motor 3 based on the control from the control circuit 1. ), A hall IC 7 for detecting the rotational speed of the motor 3 and supplying the detected rotational speed to the control circuit 1, a water supply valve 9 for controlling the water supply to the washing tank, and the water supply valve ( A driving circuit 11 for driving 9 based on the control from the control circuit 1, a drain valve 13 for controlling the drainage of water in the washing tank, and a control of the drain valve 13 from the control circuit 1; Drive circuit 15 to be driven by, a water level sensor 17 for detecting the water level in the washing tank, an indicator 19 for performing various indications including an alarm display, and various switches including a power supply switch, a start switch, and the like ( 21).

In the drum type washing machine of the present embodiment, in order to eliminate the influence of torque loss in the conventional method of measuring the amount of laundry described above, the rotational angular acceleration dω at the time of rising of the rotational speed of the rotating drum in the above-described equations (1) and (2). If / dt is (dω / dt) s, and the rotational angular acceleration dω / dt at deceleration is (dω / dt) e, and the rotational angular velocity (ω) for both rotational angular accelerations is approximately equal, Equation 1 , The moment of inertia (I _CL ) of the laundry in Equation 2 is

It is based on the fact that the torque loss T _L , which is a conventional error factor, can be eliminated.

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

Next, the operation of the embodiment of FIG. 1 will be described with reference to the flowchart shown in FIG. 3.

When the start switch included in the various switches 21 provided in the main body after the laundry is put into operation, the amount of load, which is the amount of the laundry, is detected in accordance with the flow shown in FIG. The washing, rinsing, and dehydration strokes are performed accordingly.

In the load determination judgment shown in Fig. 3, first, the acceleration time determination flag F1 and the deceleration time determination flag F2 are initialized to zero (step 110), and the motor rotation state flag fm indicating the motor rotation state. Is checked to be 0 (step 120). The motor rotation state flag fm is set to "0" during the acceleration of the motor and to "1" during the deceleration.

If the motor is now accelerating, the motor rotation state flag fm is zero, so the process proceeds to step 130, where 3000 rpm and 4000 rpm are set as? 1 and? 2, respectively, as the detected rotational speeds.

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

Then, the rotational speed NN of the motor is input (step 150), and it is checked whether the rotational speed NN is equal to the detection rotational speed omega 1 (3000 rpm) (step 160). . When the rotational speed NN of the motor reaches the detection rotational speed ω1 (3000 rpm), time measurement from the rotational speed ω1 to ω2 is started (step 170). Then, the rotational speed NN of the motor is input again (step 180), and it is checked whether or not the rotational speed NN is equal to the detection rotational speed? 2 (step 190). When the motor rotational speed NN becomes equal to the detection rotational speed ω2, time measurement is terminated, whereby the acceleration time Δt1 until the motor rotational speed NN reaches ω1 to ω2 is calculated. (Step 200).

Then, it is checked whether the motor rotation state flag fm is 0, that is, whether the motor is accelerating (step 210). Since the current process is being accelerated, the flow proceeds to step 230, where the measured time Δt1 is taken 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).

When the acceleration time T1 is determined and the acceleration time determination flag F1 is set to 1, it is checked whether both the acceleration time determination flag F1 and the deceleration time determination flag F2 are not 1 (step) 250). Since the deceleration time determination flag F2 is not yet 1 at present, the flow proceeds to step 260, and the motor rotation state flag fm is set to 1 to enter the deceleration operation, and the energization to the motor is stopped to rotate the drum. Is set to the free rotation state and the flow returns to step 120 (step 270). As a result, the motor starts deceleration, and the rotation speed starts to decrease as shown in FIG.

In the state in which the rotation speed started to fall, it is checked in step 120 whether the motor rotation state flag fm is 0. Since the motor is decelerating and the flag fm is 1, the process proceeds to step 140, where 4000 rpm and 3000 rpm are set as? 1 and? 2, respectively, as the detected rotational speeds.

Then, the rotational speed NN of the motor is input (step 150), and it is checked whether the rotational speed NN during deceleration becomes equal to the detected rotational speed ω1 (4000 rpm) (step 160). When the rotational speed NN of the motor reaches the detection rotational speed ω1 (4000rpm), time measurement from the rotational speed ω1 (4000rpm) to ω2 (3000rpm) is started (step 170). The rotational speed NN of the motor is input again (step 180), and it is checked whether or not the rotational speed NN is equal to the detection rotational speed? 2 (step 190). When NN becomes equal to the detected rotational speed ω2, the measurement of time is ended, whereby the rotational speed NN at the time of deceleration of the motor reaches from ω1 (4000rpm) to ω2 (3000rpm). Deceleration time Δt2 is calculated (step 200).

Then, it is checked whether the motor rotation state flag fm is 0 (step 210). Since it is 1 during deceleration, it progresses to step 280 and makes the measured time (DELTA) t2 the deceleration time T2. Then, the deceleration time determination flag F2 is set to 1, indicating that deceleration time is determined (step 290).

When the deceleration time T1 is determined and the deceleration time determination flag F2 is set to 1, it is checked whether or not the acceleration time determination flag F1 and the deceleration time determination flag F2 are both not 1 (step). 250). Since the acceleration time determination flag F1 and the deceleration time determination flag F2 are both 1, the flow advances to step 330, and the moment of inertia I _CL is calculated according to the above equation (4) (step 330). .

That is, as shown in FIG. 4, the acceleration time Δt1 at which the motor rotational speed rises from ω1 (3000rpm) to ω2 (4000rpm) as shown in FIG. 4 and the difference (Δω (= ω1) ω2)), the first rotational angular acceleration S1 (= (dω / dt) s) at the time of motor acceleration is calculated, and the motor speed decreases from ω1 (4000 rpm) to ω2 (3000 rpm) at the time of motor deceleration. Since the second rotational angular acceleration S2 (= (dω / dt) e) at the time of motor deceleration is calculated from the deceleration time Δt1 and the difference Δω (= ω1-ω2), these first , The moment of inertia (I _CL ) of the laundry is calculated by calculating the equation (4) using the second rotational angular accelerations S1 (= (dω / dt) s) and S2 (= (dω / dt) e). do.

When the inertia moment I _CL of the laundry is calculated, the weight of laundry, which is the load amount, can be obtained from the moment of inertia based on the load detection characteristics shown in FIG. 2, so that the weight rank is divided from the obtained laundry amount (step ( 340)), washing, rinsing, and dehydrating strokes.

In the processing, when the time Δt1 required for the rotational speed to rise from ω1 (3000rpm) to ω2 (4000rpm) during the increase of the motor speed is longer than the predetermined time Δts, the laundry It is judged that the quantity is too large, the rotation of the rotating drum is stopped, a warning indication is given to the indicator 19 in the control panel of the washing machine main body, and a warning is issued by a buzzer. In addition, even when the rotation time of the rotating drum or the motor is reduced from ω1 (4000 rpm) to ω2 (3000 rpm) when the time Δt2 is longer than the predetermined time Δte, It judges that too much, the rotation of a rotating drum is stopped, a warning indication is given to the display 19 of the control panel of a washing machine main body, and a warning is given with a buzzer (refer FIG. 5).

In the above process, during the acceleration of the motor, as shown in FIG. 6, the rotational speed of the rotating drum reaches ω2, the energization to the drive motor is stopped, and the load is determined by shifting to the deceleration stroke as indicated by the solid line. The processing time can be shortened.

In addition, after finishing the process of calculating the amount of laundry, the water supply valve 9 is operated at the time when the rotation speed is less than 3000 rpm at the time of motor deceleration, and immediately starts water supply to the rotating tub of the washing machine, and FIG. As shown in the figure, the brake may be operated to stop the rotating drum, and after the water supply is completed up to a predetermined level, the flow may be shifted to the washing stroke. In addition, although not shown in this embodiment, the electromagnetic brake circuit which brakes a motor by shorting a motor winding is provided. Then, when the rotation speed reaches 3000 rpm or less during the deceleration of the motor, the electromagnetic brake is operated to stop the rotation of the motor rapidly, thereby shortening the load amount determination processing time. The brake means is not limited to the electromagnetic brake and may be mechanical. The brake may be applied not only for the rotational speed, but also after a predetermined time has elapsed after entering the deceleration stroke.

In addition, in this embodiment, since water supply can be started before the rotation of the rotating tub stops at the time of deceleration of the motor, the time until the start of washing can be shortened, and further, the overall operating time of the washing machine can be shortened.

In the above embodiment, washing and rinsing strokes are carried out, and after entering a dehydration stroke, the amount of laundry is detected again after a predetermined time elapses, whereby the load amount at the time of dehydration, as shown in FIG. The amount of water contained in the laundry can be calculated by measuring in the judgment stroke period and comparing the laundry amount with the laundry amount in the dry state without containing the water before washing described above, whereby the dehydration rate of the laundry can be obtained. have. That is, the water content of the laundry, in other words, the dehydration rate, can be detected by carrying out the load determination process during the dehydration stroke. Usually, the dehydration time is set to 10 minutes so that the dehydration rate is almost 55%. However, the dehydration rate actually varies greatly depending on the type, quantity, water temperature, and the like of the load.

In this embodiment, a load determination process is performed after a predetermined time after the start of dehydration, for example, three minutes later. The amount of load 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 shows the relationship between the dehydration rate obtained from the experiment and the dehydration remaining time until the completion of the dehydration at 55% of the dehydration rate after 3 minutes, and the remaining dehydration time can be determined from this relationship.

Dehydration rate calculated after 3 minutes of dehydration Dehydration remaining time 48% less than 8 minutes 48 to 52% 5 minutes 52 to 55% 2 minutes More than 55% 0

For example, if the amount of cloth is 3 kg and the judgment result after 3 minutes is 6.3 kg, the dehydration rate is calculated as 48%, and 8 minutes is set as the remaining time for dehydration in Table 1. If the amount of cloth is 3 kg and the judgment result after 3 minutes is 5.8 kg, the dehydration rate is calculated to be 51.5%, which is considered to be a chemical fiber cloth which is difficult to contain water. In this case, the dehydration remaining time may be short, In Table 1, the dehydration remaining time is set to 5 minutes. In this way, the dehydration time is changed by the determination of the load during dehydration, and optimal dehydration with cloth is performed. In addition, it is not limited to the data shown in Table 1, You may use further refined reference data.

In addition, in this embodiment, based on the above-mentioned data of Table 1, when the dehydration rate does not satisfy the target 55% by the load determination at the time of dehydration, a predetermined time, for example, 1 minute, the dehydration time is extended. You can also do that. After that, the dehydration is completed while repeatedly performing the load determination and the dehydration time extension as if the load determination was performed again. In this way, the dehydration time can be automatically controlled by the determination of the load during dehydration, whereby uniform dehydration can be performed at an optimum dehydration time without being affected by the quality of the cloth, the water temperature, or the like. In this way, it is not necessary to prepare much reference data.

Moreover, in this embodiment, the dehydration course and the dehydration course etc. which correspond to the thing which do not want to dehydrate very strongly and the reverse dehydration strongly are provided, and the dehydration rate is 50% in the dehydration course, for example. In the dewatering course, the dehydration rate can be set to, for example, 60%, and the dehydration time is variably controlled in the load determination so as to obtain a predetermined dehydration rate corresponding to the selected dewatering course, thereby adjusting the deviation of the dehydration rate. It can be suppressed.

Moreover, in this embodiment, the operation part has a means which can set a dehydration rate, and a user can arbitrarily set the dehydration rate according to the quality of cloth. Then, the dehydration time is controlled so that the dehydration rate set by the dehydration rate setting means is set to the desired dehydration state.

In the drum type washing machine having a drying function in the present embodiment, the amount of laundry and the amount of moisture to be dried can be known by performing the above-described load determination process at the end of the dehydration stroke, whereby the drying time can be predicted. The drying time or the end time of operation can be displayed.

This processing will be described with reference to the flowchart shown in FIG. In Fig. 9, as described above, first, the load determination step is performed before the start of washing, and the result of the determination is set as the load amount L1 in the dry state before washing (steps 510 and 520). Then, a washing stroke and a rinsing stroke are performed (steps 530 and 540), and a dewatering stroke is started (step 550). In the dehydration stroke, the motor continues the dehydration rotation for a predetermined time (step 560), and then decelerates the motor and sets the motor rotation state flag fm to 1 (step 570). In this state, the load determination step is performed (step 580), and the result of the determination is set as the load amount L2 (step 590). The load amount L1 is subtracted from the load amount L2 to calculate the water content contained in the laundry (step 600). The drying prediction time is set in accordance with this water content (step 610), the drying prediction time is displayed as described above, and the drying process is performed to finish dehydration after the drying prediction time has elapsed (step 620). .

In addition, when the course from washing to rinsing, dehydration and drying is selected, since the drying capacity is about half of the washing capacity, it is necessary to take out the excess laundry when it is determined to be more than the maximum drying capacity by the load determination process. Water supply after the determination process is not performed. When it is determined that the drying capacity is equal to or less than the drying maximum capacity, water supply can be started after the load determination processing and before the rotation of the rotating tank is stopped.

In the above-described embodiment, in steps 130 to 280 of FIG. 3, the calculation of the rotational angular acceleration at the time of acceleration and deceleration is reduced from the time (Δt1) until the rotation speed of the motor rises from 3000rpm to 4000rpm and from 4000rpm to 3000rpm. Although it implements based on the time (DELTA) t2, it is also possible to calculate | require rotation angular acceleration as shown in FIG. 10 from the change of an angular velocity in a predetermined set time instead.

That is, as shown in Fig. 10, if the motor rotational speed reaches the set rotational speed omega (3000 rpm) during the increase in the rotational speed of the motor, the time measurement is started and the rotational speed omega 1 after the predetermined set time? T. Is measured, and the change in the rotation speed (Δωs (= ω1-ω)) between the set times Δt is calculated. Then, when the motor shifts to the deceleration stroke and the rotational speed reaches ω1, time measurement is performed again, the rotational speed ω2 after the predetermined setting time Δt is measured, and the time between the setting time Δt The change in revolution number (Δωe (= ω1-ω2)) is calculated. Then, the rotational angular accelerations during acceleration and deceleration are calculated from the angular velocity change (Δωs) at the time of acceleration and the angular velocity change (Δωe) at the time of deceleration, and this is substituted into the equation (4) to inertia moment of laundry (I _CL). ) And the load amount can be obtained from FIG. 2 from the moment of inertia.

The rotational speed calculated in the above embodiment is not limited to the rotational speed of the motor, but may be the rotational speed of a rotating drum driven by the motor, and the yaw is driven by the motor and is proportional to the rotational speed of the motor. If it is good.

As described above, according to the present invention, the first rotational angular acceleration during acceleration is calculated, and the second rotational angular acceleration is calculated during the deceleration of the free rotation state after the energization to the motor, and the first and second rotational angular accelerations are calculated. Since the laundry, which is the load amount, is determined on the basis of the above, it is possible to accurately measure the load amount, that is, the laundry amount, without being affected by fluctuations in torque loss as in the prior art.

Further, according to the present invention, a warning is issued when the rotation speed does not decelerate from the second predetermined rotation speed to the first predetermined rotation speed within the prescribed time during the deceleration of the free rotation state in which the power supply to the motor is cut off, and the acceleration of the motor is performed. In the meantime, when the rotation speed does not accelerate from the first predetermined rotation speed to the second predetermined rotation speed within the prescribed time, a warning is given, so that it is understood that the laundry that has been introduced is too large, and the correct washing can be performed.

Further, according to the present invention, since the determination of the load amount is performed before the start of washing, and after the end of the load determination process, the water supply to the rotating bath is started before the rotation stop of the rotating drum, the time until the start of washing can be shortened. The whole washing time can be shortened.

According to the present invention, when the determined load is less than or equal to the predetermined value, water is started in the rotating tank, so that proper washing can be performed.

According to the present invention, after the first rotational angular acceleration is calculated, the energization to the motor is cut off immediately, and the rotating drum is set to the deceleration state of the free rotation state, so that the time of the load determination process is shortened and the entire washing time is reduced. It can be shortened.

Further, according to the present invention, the rotation of the motor is forcibly stopped when the rotation speed drops below the prescribed rotation speed or when a predetermined time has elapsed in the deceleration state of the free rotation state of the rotating drum which has not energized the motor. The washing time can be shortened, and the whole washing time can be shortened.

According to the present invention, the water content of the laundry is calculated based on the load amount determined before washing start and the load amount determined after a predetermined time elapsed during the dehydration stroke, and the drying time is predicted based on this water content, so that the time at which drying ends Able to know.

In addition, according to the present invention, since the dehydration time is changed based on the load amount determined before the start of washing and the load amount determined during the dehydration stroke, the dehydration time can be uniformly dehydrated at an optimum dehydration time without being affected by the quality of the cloth or the water temperature. have.

In addition, according to the present invention, the load amount in the rotating drum is repeatedly determined during the dehydration stroke, and the dehydration time is controlled so that the dehydration rate becomes a predetermined value based on the repeatedly determined load amount. It can be dehydrated uniformly with optimal dehydration time.

According to the present invention, the dehydration state desired by the user can be achieved because the dehydration time is set based on the load amount repeatedly determined by the load determination unit so as to set the desired dehydration rate and to the set desired dehydration rate.

Claims (11)

Rotation speed detecting means for detecting the rotation speed of the rotating drum or the rotation speed of the motor for driving the rotating drum, First rotational angular acceleration calculating means for calculating a first rotational angular acceleration near a set rotational speed during acceleration of the rotating drum based on the rotational speed detected by the rotational speed detecting means; Second rotational angular acceleration calculating means for calculating a second rotational angular acceleration near a set rotational speed during the deceleration of the free rotation state of the rotating drum which has cut off the power supply to the motor based on the rotational speed detected by the rotational speed detection means; And a load amount determining means for determining the load amount in the rotating drum based on the first and second rotational angular accelerations. The method of claim 1, The first rotation angular acceleration calculating means includes an acceleration time until the rotation speed detected by the rotation speed detecting means accelerates from the first predetermined rotation speed to the second predetermined rotation speed during the acceleration of the motor, and the first and second predetermined rotations. Calculate the first rotational angular acceleration based on the difference in numbers, The second rotational angular acceleration calculating means includes a deceleration time until the rotational speed detected by the rotational speed detecting means decelerates from the second predetermined rotational speed to the first predetermined rotational speed during the deceleration of the free rotation state in which the power supply to the motor is cut off. And calculating a second rotation angular acceleration based on a difference between the first and second predetermined rotation speeds. The method of claim 1, The first rotational angular acceleration calculating means is configured to change the rotational speed detected by the rotational speed detecting means within a predetermined time from the first predetermined rotational speed during the acceleration of the motor and the first rotational angular acceleration based on the predetermined time. Yields, The second rotational angular acceleration calculating means includes a change in rotational speed in which the rotational speed detected by the rotational speed detecting means changes within a predetermined time from the second predetermined rotational speed and the predetermined time during deceleration of a free rotation state in which power is supplied to the motor. The drum type washing machine, characterized in that for calculating the second rotational angular acceleration based on. The method of claim 2 or 3, A warning is issued when the rotation speed detected by the rotation speed detecting means does not decelerate to the first predetermined rotation speed within the prescribed time from the second predetermined rotation speed during deceleration in the free rotation state in which the power supply to the motor is cut off. Drum type washing machine comprising a warning means. The method of claim 2 or 3, And warning means for warning when the rotation speed detected by the rotation speed detection means does not accelerate from the first predetermined rotation speed to the second predetermined rotation speed within a predetermined time during acceleration of the motor. Drum Washing Machine. The method of claim 1, The load amount determination by the load amount determination means is carried out before the start of washing, and after the end of the load amount determination process by the load amount determination means, the water supply start means starts water supply to the rotating tub before the rotation stop of the rotating drum. Drum Washing Machine. The method of claim 1, And a water supply start means for starting water supply to the rotating tub when the load amount determined by the load amount determination means is equal to or less than a predetermined value. The method of claim 1, And a deceleration state setting means for setting the rotating drum to a decelerating state in a free rotation state immediately after the first rotation angular acceleration calculating means calculates the first rotation angular acceleration and cuts off energization to the motor immediately. . The method of claim 1, In the deceleration state of the free rotation state of the rotating drum which cuts off the power supply to the motor, the rotation of the motor is forcibly forced when the rotation speed detected by the rotation speed detection means falls below a prescribed rotation speed or when a predetermined time elapses. Drum type washing machine comprising a braking means for stopping by. First load amount determining means for determining a load amount in the rotating drum before starting washing; Second load amount determining means for determining a load amount in the rotating drum during the dehydration stroke; Dehydration time changing means for changing the dehydration time based on both load amounts determined by the first and second load determination means; Repeating control means for controlling the second load amount determining means to repeatedly determine the load amount in the rotating drum during the dehydration stroke; And a dehydration time control means for controlling the dehydration time so that the dehydration rate becomes a predetermined value based on the load amount repeatedly determined by the second load amount determining means by the control of the repetition control means. The method of claim 10, Dehydration rate setting means for setting a desired dehydration rate, and dehydration based on the load amount repeatedly determined by the second load determination means by the control of the repetition control means so that the dehydration rate becomes the desired dehydration rate set in the dehydration rate setting means; Drum type washing machine, characterized in that it has a dehydration time adjusting means for adjusting the time.