JP3433135B2 - Washing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a washing machine.

[0002]

2. Description of the Related Art In a general spiral type fully automatic washing machine, an outer tub is suspended and supported by a vibration absorbing suspension rod, and a washing and dewatering tub having a large number of dewatering holes formed in its periphery is rotatable in the outer tub. It is arranged. During the dewatering operation, the washing / dehydrating tub is rotated at a high speed (for example, about 1000 rpm), and the centrifugal force causes water to be discharged from the laundry stored in the washing / dehydrating tub and scattered to the outer tub side through the dewatering holes.

If the laundry is unevenly distributed around the rotating shaft of the washing / dehydrating tub and a so-called eccentric load is present, swing vibration occurs when the washing / dehydrating tub is rotated. The washing / dehydrating tub and the outer tub have their own resonance points, and the above-mentioned vibration becomes most intense at the rotation speed corresponding to the resonance point. Although this resonance point depends on the size and weight of the washing / dehydrating tub, in a general household automatic washing machine, this resonance point is 200 r.
Often near pm. Therefore, when trying to increase the rotation speed of the washing / dehydrating tub from the stopped state to the high rotation speed as described above when starting the dehydration operation, the rotation speed corresponding to the resonance point may be passed during the increase of the rotation speed. become.

As described above, since the vibration becomes the strongest in the vicinity of the resonance point, in the conventional washing machine, the acceleration should be performed as rapidly as possible so that the washing machine passes the vicinity of the resonance point in a short time when the dehydration operation is started. Rotation control is being performed.

[0005]

However, since the resonance point depends on the weight of the washing / dehydrating tub as described above,
The rotation speed corresponding to the resonance point varies depending on the amount of laundry, that is, the load. Therefore, even if the above-described rotation control is performed, a resonance point may exist before the acceleration becomes sufficiently large, and a large vibration may occur. In addition, if the rotation speed is increased too rapidly to ensure rapid acceleration near the resonance point, the water contained in the laundry will be scattered into the outer tub within a very short time, exceeding the drainage capacity and causing the bottom of the outer tub to drain. May accumulate in the. In particular, if such a phenomenon occurs during the intermediate dehydration after the washing operation, the rotation of the washing / dehydrating tub may be stopped due to the foam restraint caused by the stirring of the detergent water.

The present invention has been made to solve the above problems, and its main object is to provide a washing machine capable of reliably suppressing the vibration of the washing / dehydrating tub at the time of starting dehydration. To do.

[0007]

Means for Solving the Problems, Embodiments of the Invention, and Effects The washing machine according to the first invention made to solve the above problems comprises: a) rotation driving means for rotating a dehydration tub; b) Vibration detection means capable of detecting the magnitude of vibration of the dehydration tank in real time, and c) At the start of the dehydration operation, the rotation speed corresponding to the resonance point was approached based on the detection result of the vibration detection means. the senses, increasing the rotational acceleration, rotational acceleration of the rotational acceleration until it at speed near that corresponding to the resonance point
Rotation control means for controlling the rotation drive means so as to be even larger.

If the rotation speed is increased too rapidly in the initial stage of the dehydration operation, the water contained in the laundry may be suddenly discharged into the outer tub and the drainage capacity from the outer tub may be exceeded. . Therefore, in the initial stage, the speed is gradually increased with a relatively slow acceleration, or the rotation speed is maintained in a low range for a certain period of time so that water is gradually discharged from the laundry. To do. In the process of further increasing the rotation speed, the vibration of the dehydration tank increases as the speed approaches the resonance point. The operation control means detects the magnitude of the vibration by the vibration detection means, and when the vibration is in the process of increasing, determines that the resonance point is approaching and increases the rotational acceleration. As a result, the rotation speed of the dehydration tank rises more sharply, and the rotation speed near the resonance point quickly passes.

When the rotation speed of the dehydration tank passes through the resonance point, the vibration becomes small, and as a result, the vibration at the time of starting the dehydration can be suppressed. Further, according to the washing machine of the present invention, even if the rotation speed corresponding to the resonance point varies depending on the magnitude of the load amount, the rotation acceleration increases near the rotation speed, so that the effect of reliably suppressing vibration is obtained. Can be obtained.

Further, as described above, when the rotation speed of the dehydration tank passes through the resonance point, the vibration gradually decreases. Since the amount of water discharged from the laundry increases as the rotation speed increases, if the rotation speed is rapidly increased up to the high-speed dewatering rotation speed, the water scattered from the laundry will accumulate at the bottom of the outer tub. There is a fear. Therefore, in the washing machine according to the first aspect of the invention, when the rotation control means detects that the rotation speed corresponding to the resonance point has been passed based on the detection result of the vibration detection means, the rotation control means reduces the rotation acceleration. It is preferable to control the rotary drive means. According to this, after the rotation speed of the dehydration tub has passed the rotation speed corresponding to the resonance point, the increase in the rotation speed becomes gentle, so that a large amount of water can be prevented from being discharged from the laundry.

[0011]

[0012]

[0013]

[0014]

Further, the washing machine according to the third invention, the machine frame
The outer tank suspended inside by a hanging rod and the inside of this outer tank
And rotatably supported by the washing and dewatering tub, this washing and dewatering tub
It receives the load that is applied to the motor that rotates the
The pressure sensor and the washing and dewatering tub during dewatering operation rotate
Unit pressure per unit time obtained by the pressure sensor
Estimate the load weight based on the average value of
Determine the degree of progress of dehydration based on the load weight of
And a control unit for ending the dehydration operation depending on the disconnection result .

[0016]

In a conventional general washing machine, dehydration is completed when a predetermined operation time elapses, so that dehydration operation may be completed even though the dehydration is not yet sufficiently completed. On the contrary, there is a high possibility that the dehydration operation is continued and the time is wasted even though the dehydration is already sufficiently performed. On the other hand, according to the third aspect of the present invention, the termination of dehydration is determined according to the actual degree of progress of dehydration, so that there is no excess or deficiency of dehydration and optimum dehydration can be performed.

Various types of vibration detecting means or weight detecting means can be used.
A pressure sensor including a magnetostrictive element that receives a force due to vibration or a load and a coil that detects a change in magnetic characteristics of the magnetostrictive element as a change in inductance can be used. The change in the inductance of the coil may be detected as a change in the oscillation frequency in an LC oscillator including the coil, for example.

Such a pressure sensor is characterized by being small and lightweight and having a wide detection range. Therefore, it does not occupy a large space even if it is attached to any part in the washing machine, and does not hinder the downsizing and increasing the capacity of the washing machine. Further, since a movable member such as a spring is not used, it does not itself cause a vibration, and the detection accuracy does not deteriorate due to deterioration of the movable member over time.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a washing machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing the structure of the washing machine of this embodiment. Inside the machine frame 10 of the washing machine, four outer tubs 11 are suspended by four hanging rods 12 (only two are visible in FIG. 1). The washing / dehydrating tub 13 having the dewatering holes is rotatably supported around the main shaft 15. A pulsator 14 for stirring laundry is arranged at the bottom of the washing / dehydrating tank 13.
The rotational power of the motor 16 attached to the lower surface of the outer tub 11 is transmitted to the washing / dehydrating tub 13 and the pulsator 14 via the motor pulley 17, the V belt 18, the main pulley 19 and the power switching mechanism 20. The power switching mechanism 20 switches the mechanism so that only the pulsator 14 is rotated during the washing operation and the rinsing operation, and the washing / dehydrating tank 13 and the pulsator 14 are integrally rotated during the dehydration operation. A drainage port 21 is provided at the bottom of the outer tub 11, and is connected to a drainage hose 24 that can stand upright via a drainage valve 22 and a drainage channel 23.

The lower end portion of the suspension rod 12 penetrates a mounting piece 25 which projects outward from the bottom wall of the outer tub 11, and a tip end thereof is provided with a vibration isolator 26 having a compression coil spring. The upper end of the coil spring is fixed to the mounting piece 25. When the load of the outer tub 11 is applied to the vibration isolator 26 via the mounting piece 25, the coil spring expands and contracts to absorb the vibration of the outer tub 11.
On the other hand, the upper end of the hanging rod 12 is movably held in the vertical direction by a hanging rod receiving metal fitting 28 fixed to a mounting piece 27 protruding inward from the machine frame 10, and four hanging rod receiving metal fittings 28 are provided. One of them is provided with a pressure sensor 1 so as to receive the load applied to the suspension rod 12.

FIG. 2 is a vertical sectional view showing an example of the pressure sensor 1. The pressure sensor 1 comprises a cylindrical giant magnetostrictive element 2
A coil 3 wound around the giant magnetostrictive element 2, a bottomed cylindrical case 4 surrounding the coil 3, and one end surface of the giant magnetostrictive element 2 in close contact with each other and protruding from the opening end surface of the case 4. And a pressure receiving portion 5 that is formed. The giant magnetostrictive element 2 is
It is an element whose magnetic characteristics change according to the speed and magnitude of the force when it is deformed by an external load such as mechanical compression, extension, and twist. That is, in the pressure sensor 1, for example, as shown in FIG.
When a pressure is applied to the upper end surface of the giant magnetostrictive element 2 via, the self-inductance of the coil 3 changes.

FIG. 3 is a graph showing an example of the relationship between the external load and the inductance in the pressure sensor 1. As is clear from FIG. 3, the pressure sensor 1 has a characteristic that the smaller the external load, the greater the amount of change in the inductance with respect to the same amount of change in the external load, that is, the higher the detection sensitivity. In the washing machine of the present embodiment, the pressure sensor 1 receives an external load due to the weight of the outer tub 11 suspended and supported by the hanging rod 12 and the washing / dehydrating tub 13 inside the outer tub 11, and the laundry is stored in the washing / dehydrating tub 13. When the water is stored in the outer tub 11, or the water is stored in the outer tub 11, the external load increases by the weight of the laundry or water. When the outer tank 11 vibrates,
It receives an external load according to the vibration.

FIG. 4 is an electric system configuration diagram of a main part of this washing machine. The LC oscillator 31 includes the coil 3 of the pressure sensor 1.
By the resonance of the inductance and the capacitor,
Oscillation having a frequency according to the inductance is generated. The frequency detection unit 32 detects the frequency of the oscillation waveform and inputs the detection result to the control unit 30. The control unit 30 includes a CPU that executes various arithmetic processes, a memory that stores an operation program, a timer, and the like. In addition to the frequency detection unit 32, the operation unit 33, the motor 16, the water supply valve 35, and the drainage valve 22 are provided. It is connected. Control unit 3
0 detects the magnitude of the external load applied to the pressure sensor 1 based on the detection signal obtained from the frequency detection unit 32.

FIG. 5 is a flowchart showing the flow of a standard washing process in the washing machine of this embodiment. The operation of the washing machine will be briefly described with reference to FIG. When washing is started, first, a predetermined amount of water is supplied into the washing / dehydrating tank 13 (step S51), and the pulsator 14 is rotated at a predetermined speed to execute a washing operation (step S52). When the washing operation is completed, the washing and dewatering tank 13
The water inside is drained (step S53), and the washing and dewatering tank 13
Intermediate dehydration is performed by integrally rotating the pulsator 14 and the pulsator 14 at high speed (step S54). By this intermediate dehydration, the detergent water soaked in the laundry is scattered and removed.

Next, a dehydration rinse operation is performed as the first rinse (step S55). In the dehydration rinsing, while washing and dewatering tub 13 is rotated at high speed as in the case of dehydration, water is dropped on the laundry from a water injection port (not shown) in a shower shape to disperse and remove the detergent water soaked in the laundry. It is a thing. After the completion of the dehydration rinsing operation, intermediate dehydration is performed by the process of step S56 similar to step S54, and then a predetermined amount of water is supplied into the laundry dehydration tub 13 (step S57). Then, as in step S52, the pulsator 14 is rotated to execute the pool rinsing operation (step S58). When the pool rinsing operation is completed, the water in the washing / dehydrating tank 13 is drained (step S59), and finally. Similar to the above-mentioned intermediate dehydration, the final dehydration is executed by integrally rotating the washing / dehydrating tank 13 and the pulsator 14 at high speed (step S6).
0).

In the washing machine of this embodiment, step S54,
It is characterized by the control during the dehydration operation (intermediate dehydration and final dehydration) performed in S56 and S60. More specifically, during dewatering operation, the detection signal from the pressure sensor 1 is used to utilize an eccentric load due to uneven distribution of laundry,
Vibrations caused by such an eccentric load are detected, and various operation controls related to dehydration operation are performed. 6 and 7
Is a control flowchart for this dehydration. Hereinafter, with reference to FIGS. 6 and 7, a control operation centered on the control unit 30 in the washing machine of the present embodiment will be described.

When the dehydration operation is started, the control unit 30 activates the motor 16 (step S1) and controls the rotation speed of the laundry dehydration tub 13 to increase to 60 rpm (step S2). As a result, the washing / dehydrating tank 13 rotates once in about 1 second. In that state, the control unit 30 reads the frequency from the frequency detection unit 32 10 times every 0.1 seconds, that is, every time the washing / dehydrating tub 13 rotates about 36 °,
The maximum value fmax and the minimum value fmin are obtained from the detected values of the times (step S3). Difference Δ between maximum value fmax and minimum value fmin
f is calculated, and it is determined whether or not the difference Δf is equal to or larger than a predetermined value (step S4). The greater the eccentric load due to uneven distribution of the laundry, the greater the variation in the detected value of the pressure sensor 1 during one rotation of the washing / dehydrating tank 13. Therefore, if the difference Δf is equal to or more than the predetermined value in step S4, When the eccentric load is judged to be abnormally large, the rotation is temporarily stopped (step S
5) Proceed to unbalance correction operation (step S6).

For example, in the unbalance correction operation, after supplying an appropriate amount of water into the outer tub 11, the pulsator 14 is rotated for a while. As a result, the laundry that is entangled in the washing / dehydrating tank 13 is loosened, and there is a high possibility that the imbalance is eliminated when the water is drained. Of course, the unbalance correction operation may be another method,
It is only necessary to be able to rearrange the unevenly distributed laundry.

If Δf is less than the predetermined value in step S4, it is determined that the initial eccentric load (that is, when the laundry contains a large amount of water) is small enough not to cause abnormal vibration. To do. Then, the control unit 30 increases the rotation speed of the washing / dehydrating tub 13 with the initial acceleration (step S7). If the initial acceleration is too large, the washing and dewatering tank 1
There is a risk that a large amount of water will be concentrated and discharged from the laundry stored in No. 3 at one time and accumulated at the bottom of the outer tub 11. Therefore, the initial acceleration is set small so that the water is gradually discharged from the laundry. The amount of water discharged depends on the load amount and the quality of the laundry, and the amount of water accumulated in the bottom of the outer tub 11 depends on the drainage capacity that varies depending on, for example, the drainage hose 24. Therefore, it is desirable to appropriately change the initial acceleration according to such various parameters.

After the dehydration operation is started, the rotation speed gradually increases as shown in FIG. The control unit 30 changes the rotation speed of the washing / dewatering tub 13 during one rotation depending on the rotation speed.
Each time (that is, every 90 ° rotation), the frequency detection unit 32
Then, the frequency is read, the maximum value fmax and the minimum value fmin are obtained from the four detection values, and the difference Δf is calculated (step S8). Since the rotation speed of the washing / dehydrating tank 13 gradually increases, the time interval for reading the frequency is controlled to be narrowed accordingly. And the difference Δ
It is determined whether or not f is a predetermined value or more (step S
9). If the vibration of the outer tub 11 increases in the process of the rotation speed of the washing / dehydrating tub 13 increasing, the fluctuation of the detection value of the pressure sensor 1 during one rotation of the washing / dehydrating tub 13 increases. When Δf is equal to or larger than the predetermined value, it is determined that the vibration is large, and the unbalance correction operation is performed (steps S5 and S6).

If Δf is less than the predetermined value in step S9, it is determined whether Δf has increased with respect to the Δf calculated immediately before (step S10). When it is determined that Δf has increased, it is determined that the rotation speed is approaching the resonance point, and it is determined whether the acceleration at that time is less than the upper limit value (step S11). If the acceleration is less than the upper limit value, the acceleration is increased by a predetermined value (step S12). As a result, as shown in FIG. 8, as the rotation speed approaches the resonance point, the increase in the rotation speed of the washing / dehydrating tank 13 becomes steeper. If the acceleration is not less than the upper limit value in step S11, the process proceeds directly to step S16 to maintain the acceleration at that time.

If it is determined in step S10 that Δf has not increased, then it is determined whether Δf is decreased (step S13). Since the vibration becomes maximum near the resonance point of the washing / dehydrating tank 13 and the vibration gradually subsides after the resonance point, the rotation speed has already passed the resonance point and is moving away from the resonance point when Δf is decreased. To judge. In that case, it is determined whether or not the acceleration is equal to or higher than the normal value (step S14). When the acceleration is equal to or higher than the normal value, the acceleration is reduced by a predetermined value (step S
15). As a result, as shown in FIG. 8, after the rotation speed passes the resonance point, the speed increase of the washing / dehydrating tub 13 gradually becomes slow. If the acceleration is not the normal value or more in step S14, the process proceeds directly to step S16 in order to maintain the acceleration at that time.

By the rotation speed control as described above, the acceleration of the rotation speed of the washing / dehydrating tub 13 becomes maximum near the resonance point. Therefore, it passes in a short time near the resonance point where the vibration is maximum. Also, in the velocity range away from the resonance point,
Since the acceleration is kept relatively small, the water is gradually discharged from the laundry. Therefore, the washing and dewatering tank 13
The water splashed through the dehydration holes in the peripheral wall of the tank is smoothly discharged to the outside through the drain hose 24 without being accumulated in a large amount at the bottom of the outer tub 11.

After controlling the increase or decrease of the acceleration in this way, the control unit 30 determines whether or not the rotation speed has reached the target rotation speed (step S16). The target rotation speed is appropriately determined according to, for example, the load amount, but is, for example, about 1000 rpm at the maximum. If the actual rotation speed has not reached the target rotation speed, the process returns to step S8 and the above processing is repeated. If the rotation speed reaches the target rotation speed (“Y” in step S16), it is determined whether a predetermined dehydration time has elapsed (step S1).
7) When the time has not elapsed, Δf is obtained from the frequency detected by the pressure sensor 1 according to the magnitude of the vibration by the process of step S18 similar to the above step 8, and this Δ
It is determined whether or not f is a predetermined value or more (step S1
9).

When there is a large variation in the water absorption rate of the laundry stored in the washing / dehydrating tank 13, when the amount of water contained in the laundry is large, even if the eccentric load is small, the dehydration operation proceeds and the laundry is washed. The eccentric load may increase as the water drains, and the vibration may become severe. Therefore, by performing the processing of steps S18 and S19, the vibration is monitored even during the period of being maintained in the vicinity of the target rotation speed to prevent the abnormal vibration and the abnormal noise due to the vibration during the dehydration. .

If Δf is larger than the predetermined value in step S19, the rotation of the washing / dehydrating tub 13 is once stopped (step S5), and the unbalanced operation is executed (step S6). On the other hand, if Δf is smaller than the predetermined value, the process returns to step S17 to repeat the above process.
In this way, if the predetermined dehydration time has elapsed (“Y” in step S17), the control unit 30 cuts off the supply of the drive current to the motor 16 (step S20). As a result, the rotational driving force of the washing / dehydrating tub 13 is lost, and the rotational speed thereof gradually decreases.

The control section 30 reads the detection signal of the frequency detection section 32 at a predetermined time interval (step S21). Then, the variation amount between the plurality of detection signals read at the predetermined time intervals is calculated (step S22), and it is determined whether or not the variation amount is equal to or less than a predetermined value (step S23). Since the detection signal of the pressure sensor 1 fluctuates due to the eccentric load in the washing / dehydrating tank 13 while the washing / dehydrating tank 13 is rotating by inertia, the process returns from step S23 to S21. When the rotation of the washing / dehydrating tub 13 is stopped and the vibration of the outer tub 11 is substantially subsided, it is determined in step S23 that the amount of fluctuation is less than or equal to a predetermined value, and thus the control unit 30 determines that the washing / dehydrating tub 13 has stopped. to decide. Then, during the intermediate dehydration, the process proceeds to the next step, and during the final dehydration, the buzzer is rung to notify the end of operation (step S24), and the dehydration operation is ended.

As a safety measure during the dehydration operation, the lid provided on the upper surface of the machine frame 10 so as to be openable and closable is the washing and dehydration tub 1.
In the washing machine having a structure in which the lid is locked so as not to be opened during rotation of 3, the lid may be unlocked in step S24.

As described above, in the washing machine according to the present embodiment, the pressure sensor 1 is used to detect the eccentric load and the vibration of the outer tub 11 in real time, and the detection result is used to increase the speed. It passes near the resonance point where the vibration becomes large in a short time, and when the vibration is large or is likely to become large, the speed increase is stopped to correct the imbalance. At the end of the dehydration operation, the pressure sensor 1 is used to detect that the rotation of the laundry dehydration tub 13 has stopped.

By the way, in the washing machine of the above embodiment, the dehydration operation is terminated when a predetermined dehydration time has elapsed. The time of this dehydration operation is determined so that a certain degree of dehydration rate can be secured in consideration of variations in the quality of the laundry, so it is extremely easy for water to drain, for example, with some chemical fibers. In the case of such a cloth quality, the dehydration operation may be continued despite the fact that the dehydration is actually almost complete. Therefore, by not performing the dehydration operation when the predetermined dehydration time elapses as described above, but by adding the dehydration end detection process described below, wasteful dehydration is prevented.

This dehydration end detection processing will be described with reference to the control flowchart of FIG. FIG. 9 describes only steps corresponding to steps S16 to S20 in the flowchart of FIG.

In the case of carrying out such a processing, before the water supply is started in the step S51, the pressure sensor 1 is used to detect the amount of laundry, that is, the load amount. That is, when the laundry is put into the washing / dehydrating tub 13, the weight of the hanging rod 12 increases by the weight of the laundry, so that the external load received by the pressure receiving portion 5 of the pressure sensor 1 increases.
Then, the inductance changes and the oscillation frequency of the LC oscillator 31 changes. The control unit 30 includes the frequency detection unit 32.
Then, the oscillation frequency is read, and the load amount is calculated by referring to a table showing the relationship between the frequency and the load amount, for example. Such a table can be experimentally checked in advance and stored in the memory.

During the dehydration operation, the residual water coefficient αw considering the dehydration rate and the like is applied to the load amount Wa obtained as described above.
The target dehydration load amount is calculated by multiplying by. After it is determined in step S16 that the rotation speed of the washing / dehydrating tank 13 has reached the target rotation speed, the control unit 30 estimates the load weight W at that time from the detection value obtained by the pressure sensor 1. As described above, the force received by the pressure sensor 1 while the washing / dehydrating tub 13 is rotating at high speed is
This includes not only the weight of the laundry and the water contained in the laundry but also that caused by vibration. Since the external load due to the vibration changes almost periodically, for example, if the average of the detected values per unit time is calculated, the load weight can be estimated based on the average value (step S30).

Each time the load weight W is obtained in this way, it is determined whether or not it is equal to or greater than the target load weight (Wa × αw) (step S31). When the dehydration operation progresses and water is drained from the laundry, the load weight W decreases, and when the water is almost drained, the load weight W becomes less than the target load weight. When the load weight W becomes less than the target load weight, it is determined that the dehydration is almost completed, and the drive current to the motor 16 is cut off (step S20). It may be assumed that the load weight W does not fall below the target load weight contrary to the prediction even in the completely dehydrated state, but in that case, at the time when it is determined in step S32 that the maximum dehydration time has elapsed. The dehydration is completed.

Therefore, according to this process, the dehydration ends almost completely when the dehydration is completed. It should be noted that instead of comparing the load weight W with the target load weight as described above, the time change of the load weight W is detected and it is determined that the dehydration is almost completed when the amount of change becomes a predetermined value or less. You may do it. If the load weight cannot be detected while the washing / dehydrating tub 13 is being rotated at a high rotation speed of 1000 rpm, for example, the speed is lowered to a rotation speed at which the load weight can be detected every predetermined time. May be.

In the above embodiment, the pressure sensor 1 is attached to the hanging rod receiving fitting 28, but it may be provided at any position in the washing machine as long as it can detect vibration. Specifically, for example, it may be embedded in a rubber leg supporting the machine frame 10 of the washing machine to detect an external load received from the floor surface. Further, the pressure sensor 1 attached to a holder made of an elastic body or the like may be provided in the machine frame 10.

Further, the vibration detecting means and the weight detecting means in the washing machine according to the present invention are not limited to the pressure sensors having the above-mentioned constitutions, but sensors having various constitutions capable of detecting vibrations and weights in real time are used. can do.

Further, it is obvious that appropriate changes and modifications can be made within the scope of the present invention. For example, in all of the above-described embodiments, the present invention is applied to the spiral fully automatic washing machine in which the washing / dehydrating tub is rotatably arranged about the vertical axis, but the drum rotates about the horizontal axis. It is obvious that the present invention can be applied to a freely arranged drum type washing machine.

[Brief description of drawings]

FIG. 1 is a side sectional view of a washing machine according to an exemplary embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an example of a pressure sensor used in this embodiment.

FIG. 3 is a graph showing the relationship between the magnitude of the external load applied to this pressure sensor and the inductance.

FIG. 4 is an electrical system configuration diagram of a main part of the washing machine according to the present embodiment.

FIG. 5 is a flowchart showing the flow of a standard washing process in the washing machine of this embodiment.

FIG. 6 is a control flowchart for dehydration in the washing machine of this embodiment.

FIG. 7 is a control flowchart for dehydration in the washing machine of this embodiment.

FIG. 8 is a graph showing changes in the rotation speed of the washing / dehydrating tub during dehydration in the washing machine of this embodiment.

FIG. 9 is a control flowchart of a main part during dehydration according to another embodiment.

[Explanation of symbols]

1 ... Pressure sensor 2. Giant magnetostrictive element 3 ... coil 4 ... Case 5 ... Pressure receiving part 10 ... Machine frame 11 ... Outer tank 12 ... Hanging rod 13 ... Washing / dehydrating tank 16 ... Motor 28 ... Hanging rod bracket 30 ... Control unit 31 ... LC oscillator 32 ... Frequency detector

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) D06F 1/00-51/02

Claims (3)

(57) [Claims] 1. A) rotation driving means for rotating a dehydration tank, b) vibration detection means capable of detecting the magnitude of vibration of the dehydration tank in real time, and c) vibration detection at the time of start-up of dehydration operation. Based on the detection result of the means, it detects that the rotation speed corresponding to the resonance point is approaching , increases the rotation acceleration, and the rotation acceleration near the rotation speed corresponding to the resonance point is the rotation acceleration up to that point.
And a rotation control means for controlling the rotation drive means so as to be even larger. 2. When the rotation control means detects that a rotation speed corresponding to a resonance point has been passed based on the detection result of the vibration detection means, the rotation control means controls the rotation drive means so as to reduce the rotation acceleration. The washing machine according to claim 1, wherein the washing machine is a washing machine. 3. An outer tank suspended by a suspension rod inside the machine frame.
When a rotatably axially supported by the washing and dewatering tub inside the outer tub, and a motor for rotating the laundry drying tub, a pressure sensor for receiving a load applied to the hanger bar, the washing and dewatering tub during dehydrating operation When the is rotating,
Of the detection value per unit time obtained by the pressure sensor
Estimate the load weight based on the average value, and based on this load weight
The degree of progress of dehydration is determined based on the
A washing machine , comprising: a controller for ending the water operation .