JPS62129096A - Control of full-automatic washing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for controlling a fully automatic washing machine.

(Prior art and its problems) In a fully automatic washing machine that has a dehydration tank that also serves as a washing tub, the intermediate dehydration process that is performed after the washing process and before the first rinsing process has conventionally been carried out regardless of the conditions of the laundry. First, it is carried out for a certain period of time (for example, one minute). The laundry conditions mentioned here are the amount of cloth, the type of cloth, and the amount of foam. As long as the amount of cloth and the type of cloth are below the rated value of the washing machine used, there will be no problem with operation and a certain intermediate dehydration effect can be obtained. However, if there is a large amount of bubbles, the bubbles will become trapped, which will not only prevent intermediate dehydration but also cause heat damage to the motor. It is generally accepted that the amount of detergent should be 0.14% of the amount of water supplied, but housewives generally tend to use extra detergent because they want to wash their clothes more thoroughly.

A large amount of detergent creates a large amount of foam during the washing process.After the washing process is finished, when the drain valve is opened, the water is drained out, but the bubbles are suspiciously floating on the water surface, so most of the water comes out. It remains in the tank afterward. When the water level switch detects that water has come out, it drives the motor to start intermediate dehydration, rotating the dehydration tank and trying to remove the water contained in the fabric. At this time, the remaining bubbles come out from the holes in the dehydration tank and the peripheral wall due to the centrifugal force of the dehydration tank, and collect between the dehydration tank and the outer tank. The bubbles act as frictional resistance against the dehydration tank, suppressing the rotation of the motor. This is a bubble-restricted state, and if an attempt is made to perform intermediate dehydration for a certain period of time despite this, there is a drawback that the motor will be overloaded, resulting in abnormal heat generation and damage to the motor.

(Object of the Invention) The present invention has been made in view of the above points, and detects the bubble-restricted state based on the rotation speed of the dehydration tank, and when the bubble-restricted state occurs, the intermediate dehydration process is stopped and the next rinsing step is started. By moving to the process, damage to the motor can be prevented, and the prescribed program operation can be completed after the next rinsing process, resulting in unnecessary work and wasted time. This has been omitted.

(Example) The uninvented example shown above will be described in detail below.

FIG. 1 is a block diagram showing the control system of a fully automatic washing machine according to an embodiment of the present invention, in which 1 is an outer tank, 2 is a dewatering tank that also serves as a washing tank, and a large number of holes 2a are formed in the peripheral side wall. . 3 is a pulsator, 4 is a water supply hose, 5 is a water supply valve, 6 is a water supply valve control unit, 7 is a drain hose, 8 is a drain valve, 9 is a drain valve control unit, 10 is a pressure pipe, 11 is a water level detector, 12 is a motor, 13 is a motor control unit, 14 is a motor pulley, 15 is a pulley belt, 16 is a center pulley, 17 is a mechanical box with a built-in brake, clutch and deceleration mechanism, 1
8 is a pulse generator attached to the same shaft as the center pulley 16, 19 is a pulse generator 1
The pulse generator 18 and the rotation speed detection section 19 form a rotation speed detection device. A turbidity detector 20 optically detects a change in turbidity of water in the outer tank 1, and is composed of a combination of a light emitting element and a light receiving element, as is well known in the art. 21 is a turbidity determination section, and 22 is a sequence control section mainly composed of a microcomputer. FIG. 2 is a flowchart showing the process from the end of the washing process to the start of water supply for the rinsing process.

In the above depiction, during the washing process, water level information in the tank is given as pressure to the water level detector 11 through the pressure pipe 10. When the sequence control unit 22 determines that the washing process has ended, it turns off the output to the motor control unit 13 and stops the motor 12.

The rotation of the motor 12 is controlled by a motor pulley 14, a pulley belt 15, a center pulley 16, and a rotation mechanism 17.
It is transmitted to Then, by the action of the clutch mechanism built into the mechanical box 17, the pulsator 3 is activated during the washing/rinsing process.
During the dehydration process, the pulsator 3 and dehydration tank 2 rotate.
and rotate in the same direction. That is, when the motor 12 is stopped and stirred at the end of the washing process, the pulsator 3 is stopped. Then, an ON signal is output to the drain valve control section 9, the drain valve 8 is opened, and the water in the tank is discharged through the drain hose 7. When the water level detector 11 detects the completion of drainage and the signal is transmitted to the sequence control section 22, an ON signal is input to the motor control section a 13 to drive the motor 12. Then, due to the action of the clutch mechanism built into the mechanical box 17,
The motor rotates 120 times from the center pulley 16 to the dehydration tank 2.
This leads to the rotation of pulsator 3. That is, intermediate dehydration begins in which the dewatering tank 2 rotates and squeezes out the loose water contained in the laundry using the U force. At the same time, the sequence control unit 22 starts counting the number of intermediate dehydration steps. Normally, within 10 seconds when bubble restriction does not occur Il'i: Dehydration tank 2
The number of revolutions is high speed rotation 4.

On the other hand, in the bubble-restricted state, the dehydrated I'vg2 only rotates slowly and never enters high-speed rotation.

The relationship between the passage of time and the number of revolutions is shown in Figure 3.

Therefore, when the intermediate dehydration time t reaches a predetermined time t1, the rotation speed N of the dehydration tank 2 is detected from the output of the rotation speed detection section 19, and the rotation speed N of the dehydration tank 2 is detected to be within one bite of the predetermined rotation speed N1. For example, the presence or absence of bubble restriction can be determined.

Motor rotation speed kn+, motor boo U-t4 (
! :If the pulley ratio of the center pulley 16 is Pl, and the number of magnetic poles of the pulse generator 18 is P2, then the rotation speed of the center pulley 16 is expressed as n, XPl, and the rotation speed N of the dehydration tank 20 is also expressed as N=n, XP, It will be done. Since the output pulse number P3 of the pulse generator 18 is equal to 22 times the mantissa turned by the center boot 16,
P3=n1XPIXP2=NXP2, and the relationship between the number of output pulses of the pulse generator 18 and the rotation speed of the dehydration tank 2 is expressed as P32NXP2.

When the rotational speed N of the dehydration tank 2 normally rises to the predetermined rotational speed N1 or more, the intermediate dehydration is continued until the predetermined intermediate dehydration time t2 comes, and then the drive of the motor 12 is stopped. The dehydration tank 2, which was rotating at high speed, rotates due to inertia. The sequence control unit 22 counts the inertial dewatering time t”t, and when the predetermined time tJ is reached, an OFF signal is output to the drain valve control unit a 9 to close the drain valve 8, and the brake mechanism built in the mechanical box 17 stops the dewatering. The water tank 2 is stopped.Then, the water supply valve control unit 6 outputs the KON signal to open the water supply valve 5, and water is supplied for the first rinse.On the other hand, when a bubble-restricted state is detected, the rotation of the dehydration tank 2 is stopped. Since it is very slow, there is almost no inertial rotation, and there is no problem even if the drain valve 8 is closed at the same time as the motor 12 is completely stopped, and the dewatering tank 2 is stopped by the brake mechanism.Then, the water supply valve 5 is opened and the
Supply water for the second rinse. When water supply starts, the bubbles that have collected between the outer tank 1 and the dehydration tank 2 in the bubble-restricted state will be removed.
The dehydrating i+l 17 returns into the dehydrating tank 2 through the hole 2a in the peripheral side wall, and is dissolved in water and diffused. Therefore, rinse 1
During intermediate dehydration after the end of the cycle, there will be no bubble restriction. In the bubble restraint state, it is slow but dehydrated f”ik2
The bubbles are also moving in the same direction while suppressing their rotation. In addition, since the foam is light, even if intermediate dehydration is continued in the foam-restricted state, the foam cannot be discharged, which only leads to abnormal heat generation in the motor. If you supply water and start rinsing as soon as possible, there will be less time wasted and the rinsing will be more effective.

In the embodiments described above, when the bubble restraint state is detected during the intermediate dehydration process, the motor 12 is activated to stop the intermediate dehydration process.
Damage caused by abnormal heat generation will be reliably prevented.

Furthermore, after stopping the intermediate dehydration step, the process moves to the next rinsing step, and thereafter, the predetermined fluorogram operation is completed through the second intermediate dehydration and second rinsing to the final dehydration step. Therefore, compared to the case where, for example, the subsequent program operation is also stopped due to the interruption of the intermediate dehydration process, there is no need for labor and waste of time, and this is extremely favorable.

In particular, in the example, the process immediately shifts to the rinsing process without waiting for the remaining p time of the intermediate dehydration process to elapse, which is more preferable in terms of time. In the above embodiment, the washing machine is a fully automatic washing machine that optically detects the change in water turbidity during rinsing, automatically determines the rinsing condition, and ends the rinsing process.
This is extremely advantageous since there is no concern about insufficient rinsing due to discontinuation of the intermediate dehydration step.

It goes without saying that the uninvented control method can also be implemented in fully automatic washing machines that time-control the rinsing process.

In this case, there is a concern that rinsing may be insufficient due to the discontinuation of the intermediate dehydration step, but since the intermediate dehydration and rinsing steps are usually repeated multiple times, this is hardly a problem in reality.

Further, in the embodiment shown in FIG. 1, the pulse generator 18 is mounted on the same rotating shaft as the center pulley 16, but the mounting location and the detection means are not limited to this. That is, the pulse generator 18 may be attached to the rotating shaft of the motor 12, and in that case, the relationship between the output pulse MP3 of the pulse generator 18 and the rotation speed N of the dehydration tank 2 is expressed as P 3 = N X P 2 / P 1 It will be done.

However, Pl is motor pulley 14 and center pulley 1.
The pulley ratio is 6, P2 is the number of magnetic poles of the pulse generator 18, and as a rotation detection means, a rotating plate is attached to the rotating shaft, a null is provided on the rotating plate, and a photointertarder is used, or a magnet is attached to the rotating plate. It is possible to apply a method such as attaching it and using a Hall element. As in the case of the pulse generator, the rotation axis may be the rotation axis of the motor 12 or the rotation axis of the center shaft IJ-16.

(Effects of the Invention) As described above, according to the uninvented control method, it is possible to stop the intermediate dehydration process when the bubble is trapped, thereby preventing damage caused by abnormal heat generation of the motor, and furthermore, it is possible to prevent the motor from being damaged due to abnormal heat generation. It is possible to proceed to the rinsing step and carry out a predetermined programmed operation, which is extremely useful without any effort or waste of time.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the control system of a fully automatic washing machine according to an embodiment of the great invention, Figure 2 is a flow chart showing the process from the end of the washing process to the start of water supply in the rinsing process, and Figure 3 is a diagram showing the intermediate dewatering process. It is a figure which shows the relationship between elapsed time and the number of rotations of a dehydrator. 2: Dehydration tank, 12: Motor, 18: Pulse generator, 19: Rotation speed detection unit. Agent: Patent attorney Aihiko Fuku (2 others) Figure 3

Claims (1)

[Claims] 1. In devices that automatically execute each process such as washing, intermediate dehydration, and rinsing in sequence according to a predetermined program, the rotation speed of the dehydration tank is detected during intermediate dehydration, and the rotation speed reaches a predetermined value within a certain period of time after the motor is driven. A method for controlling a fully automatic washing machine, which controls the intermediate dewatering process to be stopped and the process to proceed to the next rinsing process when the value is not reached.