JP2002282590A - Dehydration control method for washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dehydration control method for washing machine capable of making an automatic operation effective by not perfectly stopping dehydration operation immediately when an impact value is small even if an unbalance detection switch is operated to judge an unbalance state in dehydration process. SOLUTION: A washing machine for automatically progressing washing, rinsing and dehydration processes provided with an abnormal vibration detecting means for detecting an abnormal vibration generated by the large gathering to one side of clothes within a washing and spinning tub in dehydration process, is further provided with a detection frequency measuring means for measuring the detection frequency of abnormal vibration and a rotating speed detecting means for detecting the spinning rotating speed for dehydration. The value of detecting frequency of abnormal vibration is set on the basis of the value of the spinning rotating speed, and when the detection frequency of abnormal vibration reaches the set value thereof, the dehydration operation is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling dehydration of a washing machine.

[0002]

2. Description of the Related Art As is well known, for example, as shown in FIG. 2, a fully automatic washing machine suspends a water tub 4 in an outer box 1 with a hanging rod 2 and a vibration isolator 3 so as to swing freely. Inside, the rotor 6 at the bottom
The washing and dewatering tub 5 having the above structure is rotatably disposed, and a driving device 7 such as a motor is disposed below the water tub 4.

In such a fully automatic washing machine, the steps of water supply, washing, rinsing, and dehydration automatically proceed. Of the laundry is biased to one side, and the oscillation and noise of the washing and dewatering tub 5 are transmitted to the water tub 4, and the water tub 4 vibrates and comes into contact with the outer box 1 of the washing machine, causing the entire washing machine to vibrate abnormally. In some cases, the washing machine may not be able to perform washing, or in the worst case, the washing machine may fall.

Therefore, in order to prevent such a situation from occurring, conventionally, for example, it is located between the water tank 4 inside the outer case 1 and used as an abnormal vibration detecting means so as to be displaced by abnormal vibration during dehydration. A balance detection lever 8 and an unbalance detection switch 10 that is operated by the displacement of the unbalance detection lever 8 are provided, and the unevenness of the laundry in the washing and dewatering tub 5 becomes more than a certain value. When the water tub 4 supported by the vibration proof system by the vibration proof unit 3 oscillates, the water tub 4 pushes the unbalance detection lever 8.

As a result, the unbalance detection detection lever 8 is displaced, and the unbalance detection switch 10 is actuated. The unbalance detection signal from the unbalance detection switch 10 causes the control device using a microcomputer to perform the unbalance detection. The state is determined and output to the driving device 7 and the like to stop the dehydration operation.

In the figure, reference numeral 9 denotes a shaft attachment portion of the unbalance detection lever 8, and the unbalance detection lever 8 swings around the shaft attachment portion 9 as a fulcrum. Reference numeral 11 denotes a return spring that returns the unbalance detection lever 8 to a predetermined detection position.

[0007]

In recent years, washing machines have been miniaturized for the purpose of saving water and saving energy. As a result, the washing machine between the water tank 4 in which the vibration isolator is disposed and the outer box 1 is provided. Gap is getting smaller. For this reason, even if the amount of whirling of the water tank 4 is small, the water tank 4 pushes the unbalance detection lever 8, and the unbalance detection switch 10 is operated in the dehydration process to determine that the state is unbalanced as in the related art. In such a case, if the dehydration operation is always completely stopped, the number of cases where the dehydration operation stops during the dehydration process increases, which also hinders the fully automatic operation.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art. Even if the unbalance detection switch is operated in the dehydration process and the imbalance state is judged, the dehydration operation is immediately completed when the impact value is small. Without stopping,
An object of the present invention is to provide a method for controlling dehydration of a washing machine that can make automatic operation effective.

[0009]

According to the present invention, in order to achieve the above object, first, a washing, rinsing and dehydrating process automatically proceeds, and a large piece of clothing in a washing and dehydrating tub is provided in the dehydrating process. In a washing machine provided with abnormal vibration detecting means for detecting abnormal vibration caused by deviation, a detecting frequency measuring means for measuring the number of times of abnormal vibration detection and a rotational speed detecting means for detecting a dehydrating rotational speed are provided. The value of the number of times of detection of abnormal vibrations is set based on the value of (1), and the dehydration operation is stopped when the set value of the number of times of detection of abnormal vibrations is reached.

[0010] Thus, if the abnormal vibration is detected even once, the dehydration operation is not immediately stopped in all cases, so that it is possible to reduce the operation stop caused by the bias of the clothes in the dehydration process. , Can perform automatic operation.

Second, the value of the number of times of detection of the abnormal vibration is
By setting different values corresponding to different spinning speed values, the value of the number of times of detection of abnormal vibration suitable for the progress of spinning that reduces the load gradually is set, according to the actual situation of operation Can be set to something.

Third, the value of the number of times of detection of the abnormal vibration is:
If the value of the spin speed is low, set it to be high, and if it is high, set it to be low.If the impact value at low speed is small, abnormal vibration will be detected many times and then the operation will be stopped. The operation is stopped only in the case of a large imbalance such that vibration is detected, and it is possible to avoid unnecessary operation stop. Moreover, danger can be prevented by stopping operation instantaneously with respect to abnormal vibration generated during high-speed operation with a large impact value.

Fourth, the value of the number of times of detection of the abnormal vibration is:
It can be set as desired by operating the operation switch provided on the washing machine, so it can be freely set to the desired value according to the needs of the user and at any time even after purchasing the washing machine. , And easy to use.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a flowchart showing the operation of the spin-drying control method of the present invention, and FIG. 2 is a vertical sectional side view of a washing machine in which the spin-drying control method is performed. The basic structure of the washing machine is the same as that described with reference to FIG. A detailed description of the above will be omitted. In the washing machine in which the method of the present invention is carried out, the steps of water supply, washing, rinsing, and dehydration automatically proceed, and an unbalance detection lever that is displaced by abnormal vibration during dehydration as the abnormal vibration detection means of the water tub 4. 8 and an unbalance detection switch 10 that is activated by the displacement of the unbalance detection lever 8.

In the present invention, in addition to the abnormal vibration detecting means, a detecting number measuring means for measuring the number of abnormal vibrations detected and a rotational speed detecting means for detecting the spinning rotational speed are provided. The detection number measuring means is, for example, a control device using a microcomputer for controlling the washing operation, and counts the number of times a detection signal from the unbalance detection switch 10 is input to the control device.

As the dehydration rotation speed detecting means for detecting the dehydration rotation speed, a rotation speed detector attached to a motor constituting the driving device 7 or the like is used.

Next, the dehydrating operation of the present invention will be described with reference to FIG. When the dehydration process is started, the control device sets a dehydration high-speed flag F1 for identifying operation in which the dehydration rotation speed exceeds 150 rpm, an abnormal vibration flag F2 for identifying the presence or absence of abnormal vibration, and an abnormal frequency counter B to 0.
[Step (100)], the drive device 7 is energized [Step (101)], for example, the dehydration timer that counts the dehydration time every minute is reset [Step (102)], and the dehydration operation is started. At the same time, the timer count starts [step (103)].

After the start of the dehydration operation, until the set time of the dehydration set in the control device is reached, [Step (10)
4)], the spinning speed detecting means measures the spinning speed [Step (105)], and the value of the spinning speed is stored in the register N. Next, an abnormal vibration determination is performed [Step (106)]. At this time, since the abnormal vibration flag F2 = 0 is initially set in [Step (100)], the next high-speed determination is performed [Step (107)]. ].

However, since the dewatering operation has just started and the dewatering rotation speed is as low as 150 rpm or less,
Proceed to the next abnormal vibration detection [step (109)]. At this time, if the unbalance has not reached the set amount, it is determined that no unbalance has occurred [Step (10)
3)] and this step is repeated. Then, when the spin-drying process proceeds and the spin-drying speed becomes 150 rpm or more [Step (107)], the spin-drying high-speed flag F1 = 1 (Step (108)). If it returns to [Step (103)], this process is repeated.

This process is repeated until the dehydration end time is reached, and the dehydration operation proceeds without stopping. When the dehydration end time is reached [Step (104)], the drive device 7 is turned off by the output from the control device [ Step (118)],
The count of the dehydration timer is cleared [Step (1
19)), the dehydration operation ends.

Incidentally, the number of rotations of dehydration after starting the dehydration operation is 1
During low-speed operation at 50 rpm or less [Step (10
7)], the clothes in the washing and dewatering tub 5 are biased, and the water tub 4 swings around. When the water tub 4 pushes the unbalance detection lever 8, the unbalance detection lever 8 is displaced, and the unbalance detection switch 10 Operates to input an unbalance detection signal from the unbalance detection switch 10 to the control device [step (109)].

At this time, since the washing and spin-drying tub 5 is in the low-speed operation state in which the spin-drying speed is 150 rpm or less as described above, the spin-drying high-speed flag F1 = 0 and [step (11)
1)], 1 is added to the abnormal vibration frequency counter B, and B
= 1 [step (112)]. Then, the process proceeds to the next detection number determination [step (113)]. Since the value of the abnormal vibration number counter B is 1 as described above and is 4 or less set here, the next stop determination [ Step (114)].

In the determination of the number of times of detection in [Step (113)], the number of times of detection is set to 4 during low-speed operation due to imbalance generated near the primary natural vibration having a small impact energy value. This is the number of continuous occurrences for estimating the degree of imbalance as a condition for completely stopping the dehydration step, and the number is not limited to four. The number of times can be arbitrarily set by operating an operation switch provided in the washing machine.

After the occurrence of imbalance is detected in this way and the number of times of detection is counted, the number of revolutions of the washing and dewatering tub 5 is detected, and it is determined whether or not the machine is stopped at 10 rpm or less. From [Step (11
4)], the control device outputs to the drive device 7 to cut off the power [Step (115)].

The abnormal vibration flag F
2 = 1 (step (110)), and the dehydration process is temporarily stopped.

Then, returning to [Step (103)],
While the timer count of the spin-drying time is continued, the spin-drying speed is detected (steps (104) and (105)). Then, in [Step (106)], the above [Step (11)
0)], the abnormal vibration flag F2 = 1 was set.
The process proceeds from [Step (106)] to [Step (114)], and it is determined whether the washing and dewatering tub 5 has stopped.

At this time, the number of rotations of the drive unit 7 is reduced due to the power cutoff as described above, but the number of rotations is 10 rpm while the washing and dewatering tub 5 is rotating by inertia.
m (step (11)
4)], the driving device 7 is kept off.

When this step is repeated, the rotation due to the inertia of the washing and dewatering tub 5 is stopped, and the rotation speed determined in [Step (114)] is stopped at 10 rpm or less, the drive unit 7 is energized again. The dehydration operation is restarted [step (116)], and the abnormal vibration flag F2 becomes 0 [step (117)]. Then, [Step (1)
03)] to detect the spinning speed while continuing the timer count of the spinning time [step (104) (1)
05)].

In [Step (106)], since the abnormal vibration flag F2 is set to 0 in [Step (117)], the dehydration operation is shifted to a low-speed operation state near the primary natural vibration of the initial stage and at a dehydration rotation speed of 150 rpm or less. During a certain period, the operation is continued while the abnormal vibration is detected in the same manner as described above.

When abnormal vibration is detected, the power supply to the driving device 7 is shut off in the same manner as described above, the spinning step is temporarily stopped, and if the rotation of the washing and spinning tub 5 due to inertia is stopped, the driving device is stopped. 7 and the operation is resumed. In this way, in the low-speed operation state, when abnormal vibration is detected, the primary stop and restart are repeated, whereby the moisture contained in the clothes is discharged by centrifugal force and the clothes become lighter, causing imbalance. It becomes difficult to perform, and it can shift to high-speed operation smoothly. Therefore, without completely stopping the dehydration process due to imbalance generated in the low-speed operation state,
The operation can be shifted to high-speed operation, and the dehydration process can automatically proceed.

However, when the abnormal vibration generated in the low-speed operation state is four or more times (step (113)), large deviation of the clothes that cannot be repaired even if the operation is temporarily stopped and restarted four or more times is performed. When it is determined that the occurrence has occurred, the power of the driving device 7 is cut off [step (118)], the count of the dehydration timer is cleared [step (119)], and the operation is stopped.

On the other hand, when the operation is started from the low-speed dehydrating operation and is in the high-speed operation state in which the spinning speed is 150 rpm or more [Step (107)], the dehydrating high-speed flag F1 is set to 1 [Step (108)]. If abnormal vibration is detected in the state [Step (109)], the impact energy due to imbalance is large and dangerous, so if there is abnormal vibration, the power supply to the driving device 7 is immediately cut off and the operation is stopped [ Step (111) (118) (11)
9)].

If no abnormal vibration is detected during the high-speed dehydration operation [Step (109)], the operation continues until the dehydration end time counted by the dehydration timer, and the dehydration process ends [Steps (103) and (104). ) (118)
(119)].

As described above, during a low-speed operation in which the impact energy value generated by the displacement of the clothing is small, even if the displacement of the clothing occurs, it is determined that the displacement can be repaired only by a temporary stop. By stopping the dehydration process only when the number of occurrences detected reaches a plurality of times, it is possible to reduce the complete stop of the operation during the dehydration process.

[0035]

As described above, according to the method for controlling dehydration of a washing machine of the present invention, first, the steps of washing, rinsing, and dehydrating automatically proceed, and during the dehydrating step, the clothes in the washing and dehydrating tub are removed. In a washing machine provided with abnormal vibration detecting means for detecting abnormal vibration caused by large deviation, a washing frequency measuring means for measuring the number of times of abnormal vibration detection and a rotational speed detecting means for detecting a spinning speed are provided. The value of the number of times of detection of abnormal vibration is set based on the value of the number of revolutions, and when the set value of the number of times of detection of abnormal vibration is reached, the dehydration operation is stopped.

Thus, if the abnormal vibration is detected even once, the dehydration operation does not stop immediately in all cases, so that it is possible to reduce the operation stop caused by the bias of the clothes in the dehydration process. , Can perform automatic operation.

Second, the value of the number of times of detection of the abnormal vibration is:
By setting different values corresponding to different spinning speed values, the value of the number of times of detection of abnormal vibration suitable for the progress of spinning that reduces the load gradually is set, according to the actual situation of operation Can be set to something.

Third, the value of the number of times of detection of the abnormal vibration is:
If the value of the spin speed is low, set it to be high, and if it is high, set it to be low.If the impact value at low speed is small, abnormal vibration will be detected many times and then the operation will be stopped. The operation is stopped only in the case of a large imbalance such that vibration is detected, and it is possible to avoid unnecessary operation stop. Moreover, danger can be prevented by stopping operation instantaneously with respect to abnormal vibration generated during high-speed operation with a large impact value.

Fourth, the value of the number of times of detection of the abnormal vibration is
It can be set as desired by operating the operation switch provided on the washing machine, so it can be freely set to the desired value according to the needs of the user and at any time even after purchasing the washing machine. , And easy to use.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an operation of an embodiment of a washing machine dewatering control method of the present invention.

FIG. 2 is a vertical sectional side view of a washing machine in which the method for controlling dehydration of a washing machine according to the present invention is performed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer box 2 ... Hanging bar 3 ... Anti-vibration part 4 ... Water tank 5 ... Washing and dewatering tank 6 ... Rotating blade 7 ... Drive device 8 ... Unbalance detection lever 9 ... Shaft attachment part 10 ... Unbalance detection switch 11 ... Reposition Spring

Claims (4)

[Claims] 1. A washing machine provided with abnormal vibration detecting means for automatically performing washing, rinsing, and dehydrating processes, and detecting abnormal vibration caused by large deviation of clothes in a washing and dehydrating tub during the dehydrating process. In, provided a number-of-detections measuring means for measuring the number of times of detection of abnormal vibration and a number-of-rotations detecting means for detecting the number of rotations of dehydration, and set the value of the number of times of detection of abnormal vibration based on the value of the number of rotations of dehydration, A dehydration control method for a washing machine, wherein the dehydration operation is stopped when the set value of the number of times of detection of abnormal vibration is reached. 2. The dehydration control method for a washing machine according to claim 1, wherein the value of the number of times of detection of the abnormal vibration is set to be different depending on the value of the dehydration rotation speed. 3. The washing machine according to claim 1, wherein the value of the number of times of detection of the abnormal vibration is set to be large when the value of the spinning speed is low, and to be small when the value of the spinning speed is high. Dehydration control method. 4. The washing machine according to claim 1, wherein the value of the number of times of detection of the abnormal vibration can be arbitrarily set by operating an operation switch provided in the washing machine. Dehydration control method of the machine.