KR100348768B1 - Automatic Control Washing Machine - Google Patents

Abstract

During the dehydration process, it is a measure of the undesirable braking action applied to the washing drum, for example, the generation of bubbles, so that the dehydration process can be avoided while the braking foam is present in the washing tub. The signal determined by the ratio of (1) standard speed, (2) actual rpm, and (3) electrical variable according to the load can be supplied to the control circuit of the washing machine. This ensures a robust foam identification and can remove the foam.

Description

Automatic control washer

The present invention relates to an automatic control washing machine having a drive motor for driving a washing drum having various different speeds for washing, rinsing and dehydration, wherein the angular velocity (rpm) of the drive motor is based on an rpm control circuit based on phase angle control. It is adjustable and can be determined according to the set-point and actual rpm values.

In this type of known washing machine (DE 36 28 498 A1), in order to measure the presence of foam, the pressure in the so-called pan of the washing machine is measured using a pressure sensor known for level measurement. Infers the presence of bubbles. However, when pressure is applied to the water remaining in the pan by the detergent pump, dehydration is stopped because the level of detergent and water in the tub appears to be high enough that in no case should the dehydrator be operated. Therefore, it is uncertain to see the presence of bubbles in this way. In addition, at least one switch is required because the pressure supply device must be used at the same time to check the water level and the presence of foam, thereby increasing the cost of the component.

Therefore, the object of the present invention is to find the possibility of recognizing the presence or absence of bubbles without inserting additional components.

This problem is to supply a signal during the dehydration process to the control circuit of the washing machine according to the present invention, for example, when the foam is generated, the degree of braking to the rotation of the washing drum inevitably controls the operating variable of the drive motor, that is (1) standard rotation It can be solved by measuring by number, (2) actual rpm, and (3) electrical parameters according to load.

The rpm control circuit may be a chopper control circuit, and the electrical variable according to the load may be the current capacity of the drive motor.

The rotational speed value is present as an electric quantity in the rpm control circuit of a modern washing machine, and the electrical variable according to the load can also be set as the value of the motor current or the phase angle of the motor current in the rpm control circuit. No additional components are needed to identify the presence of bubbles.

The washing machine according to the present invention is formed in a very advantageous way by allowing the drum's dehydration drive to be shut off for at least a limited time when the signal approaches a size that can determine the presence of the amount of foam that brakes the drum's rotation. As such, while the dehydrator drive is blocked, the foam may settle on the bottom of the laundry tub and be turned off.

According to another advantageous configuration of the washing machine according to the present invention, residual detergent residues can be removed by a detergent pump while the dehydrator drive is shut off.

In the washing machine according to still another aspect of the present invention, the drum can be rotated counterclockwise while the driving device of the dehydrator is blocked in order to promote the removal of bubbles. This speed drive is performed at a constant low speed so that no more bubbles are generated due to the drum motion, but rather the bubbles are eliminated.

The washing machine of another advantageous configuration according to the present invention can be effectively removed by starting the rinsing process once again when it is confirmed that braking is caused by the foam when there is a large amount of foam. When the laundry is too densely packed in the drum or when the amount of foam is too large, a strong braking rotational force is caused in the drum, which can be measured reliably around the drum by the three parameters described above. In this way, different measures can be taken depending on the amount of foam identified. In taking these measures, even when starting another rinse procedure, it is very advantageous to carry out another rinse procedure with a fairly high level of detergent.

The dependence of dehydration process and foaming can be well understood by the diagram of the motor speed and the motor current over a period of time shown in the figure.

The diagrams of FIGS. 1 and 2 show the elapse of the motor current i over time t and the number of revolutions n of the corresponding drum over time t. The phase angle, which can be estimated directly from the control circuit for the drum's drive motor, is proportional to the shown current passing through the drum drive motor.

The same batch of laundry was put into a single washing machine to obtain the plot shown and investigated. In the diagram of FIG. 1, when the dehydration process began, the laundry was already rinsed well and no foaming occurred. There was no residue content in the water still in the laundry. When the current was connected to the drive motor and the rotation speed of the motor was accelerated to about 100 rpm, the current of the motor rose to a needle shape up to 4.5 A and then adjusted to approximately 1.2 A. As the drive motor is further accelerated from 100 rpm to about 240 rpm, the needle-like rise of the motor current i is significantly smaller (up to about 2.4 A). Here, the already initiated washing motion has the effect of reducing the inertia. At 240 rpm, the motor current falls back below 1.4A. The motor current gradually rises to 1.5 A or more while the rotation speed of the motor rises flat and inclined to about 800 rpm. When the drum speed remains at about 800 rpm, the motor current drops back to about 1.5 A. After a short interruption-current peak, the motor current i returns to zero again, and the revolution speed rapidly drops to 0 rpm.

When the idle current is measured as 0A or more, the current diagram shows a similar value of the total current capacity of the washing machine. However, if the motor is not connected, the current capacity is only about 500 A, which is negligible compared to the high current capacity of the drive motor.

There is also a foaming detergent in the laundry that we observe to plot in Figure 2. The current curve on the diagram continues in principle until it reaches about 220 rpm, almost as in the diagram shown in FIG. 1 while the dehydrator is in operation. However, since there must already be some foam between the laundry tub and the spinning drum, after the peak of the current capacity and the needle-shaped peak while the rotational speed is about 100rpm, it accelerates to about 220rpm. The decrease in current is significantly higher than in the corresponding segment of FIG. Subsequently, even in the investigation study in FIG. 2, the washing drum is accelerated from the 220 rpm highland along the inclined ramp to about t = 2 min, where the foam that brakes rotation is clearly prevented.

This appears to cause the motor current to soar above about 4.5 A. This current reaches its output limit and the drum can no longer accelerate due to the braking rotational force generated by the foam. Thus, the rotational speed of the drum is maintained at about 400 rpm. This fact leads to two major drawbacks. That is, on the one hand, the drum motor is frequently subjected to excessive loads (for example, the rated power is about 300W while the actual power is about 750W). This causes the motor to overheat and prematurely wear out.

On the other hand, if the number of revolutions of the dehydrator is reduced, the dehydration of the laundry becomes insufficient. In addition, detergent and water that is dewatered and bounced out are strongly introduced mechanically through the dehydrating drum, resulting in more bubbles, which makes it more difficult to remove the bubbles. After the drive is shut off, as well as the motor current, the rotation speed of the washing drum is returned to zero again.

The diagrams shown in FIGS. 3 and 4 show the use of the control circuit according to the invention to control the drive motor, which, for example, is applied to the laundry drum due to the generation of foam. Loss may be supplied with a signal that is a measure of undesirable braking action. Referring to the diagram shown in FIG. 3, it can be seen that assuming that the amount of laundry is the same and other conditions are the same, the ratio of the rotation speed to the required amount of the motor current is also almost the same. Unlike in the example of FIG. 1 that was more than 4 minutes, prematurely reducing the speed between about 3 and 2/3 minutes between 700 and 800 rpm changes the program, resulting in foaming and doing nothing.

On the other hand, in FIG. 4, the control circuit constructed by the present invention shows that when the rising ramp exceeds 400 rpm, the motor current rises to 4.5 A or more, and the adjusted rotation speed no longer follows the standard passage seen in FIG. Because it cannot be, it shows stopping the dehydration process started. By this, it is also possible to find out the excessive load on the washing drum due to external influences, for example, braking action of the foam. As shown in the diagram, by monitoring the rise of the motor current itself, the phase angle of the motor current supply and the ratio of the actual rpm to the standard rotation speed, such undesirable operating conditions can be monitored.

Also, instead of the above kind of control, the drive motor can be adjusted based on the chopper control.

According to another advantageous configuration of the invention, it is possible to connect another result from the interruption of this dehydration process to the preceding program process. First, it is important to shut off the drum dehydrator drive for at least a limited time. As such, it is advantageous to operate the detergent pump of the washing machine so that the detergent collected in the disappearing foam can be immediately discharged from the washing container during the time when the driving device of the dehydrator is stopped. It no longer stays in the detergent container and no longer participates in continuing detergent production.

Subsequently, in order to prevent bubbles from forming during the dehydration process, the amount of braking foam contained in the washing container should be checked, and at least one additional rinsing process should be performed. This additional rinse process further lowers the residue content of the detergent, thereby reducing the risk of foaming again. After the additional rinse cycle is complete, the test for dehydration can be repeated. If necessary, this additional rinsing procedure may be carried out at high water levels.

To use the washing machine conveniently, considering the braking action caused by the foam of the detergent in advance, remember the number of times the dehydration process is stopped when the foam is generated, and experience from the constant frequency of such recovery for future treatment. It is highly desirable to provide a device in the control circuit that adds a rinse recovery number corresponding to the numerical value acquired by the washing machine to a predetermined rinse recovery number in advance by the washing machine manufacturer.

Therefore, in this case, after the recovery of the predetermined treatment process is completed, the test on the recovery value rinsing process set by the manufacturer is performed again, and the washing machine operator changes the operation method such as changing the detergent, for example. It is desirable to test the main part. As an alternative to this, however, in principle, after the dehydration process test other than the rinse recovery time set in advance by the manufacturer, the initial dehydration test is followed by a rinse count corresponding to the acquired experience value. The control circuit can be formed so as to be connected before.

1 through 4 are diagrams showing that the number of revolutions and the current of a motor over a period of time depends on dehydrator and foaming.

Claims (9)

Laundry drums; A drive motor for driving the washing drum at a plurality of different speeds for washing, rinsing and dehydration; An rpm control circuit for adjusting the rpm of the drive motor; In an automatic control washing machine comprising means for determining the rpm of a drive motor according to a set-point and an actual rpm value, The control signal receives the signal during the dehydration process, which signals the drum's undesirable braking action and a) standard speed, b) actual rpm, c) determined by the reciprocal ratio of operating parameters, such as other qualitative variables to the load, The control circuit is an automatic control washing machine, characterized in that for controlling the dehydration operation of the washing machine according to the signal. The washing machine according to claim 1, wherein the rpm control circuit is a phase angle control circuit and the electrical variable according to the load is a phase angle of the supply voltage of the drive motor. The washing machine according to claim 1, wherein the rpm control circuit is a chopper control circuit, and the electrical variable according to the load is the current capacity of the drive motor. 4. The drum dehydrator drive of claim 1, 2 or 3, wherein the drum dehydrator drive comprises means for shutting off for at least a limited time if a signal of a magnitude presumed to be present in the drum is applied to the drum. The washing machine characterized by. 5. A washing machine according to claim 4, comprising means for continuing to operate the water and detergent pump for a period of time during which the water, detergent pump and dehydrator drive are shut off. 5. The washing machine according to claim 4, wherein the washing machine comprises a means for reversing and driving the drum in the speed increase driving process during the time period in which the driving device of the dehydrator is blocked. 7. The washing machine according to claim 6, wherein at least one rinsing process can be further started after the presence of the amount of foaming brake is confirmed. 8. The washing machine according to claim 7, wherein a further rinsing process can be performed using a higher level of water. 8. The method according to claim 7, wherein the number of attempts to dehydrate is stored, and for a further treatment, from the constant number of times, the number of rinsing cycles corresponding to the value acquired by experience is set as the number of rinsing cycles set in advance. Washing machine characterized in that the control circuit includes a device added in advance or stored in advance before the next dehydration process test.