JP3284781B2 - Washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine for sequentially controlling the steps of washing, rinsing and dewatering.

[0002]

2. Description of the Related Art Conventionally, this type of washing machine has been configured as shown in FIG. Hereinafter, the configuration will be described.

As shown in FIG. 1, a control means 1 includes a motor 3 for driving a washing and dewatering tub (not shown), a water supply valve 4, a drainage water, and a power switching means 2 constituted by a bidirectional thyristor or the like. By controlling the valve 5 and the like, each step of washing, rinsing, and dewatering is sequentially controlled. The waveform shaping means 6
The waveform of the voltage induced at both ends of the phase-advancing capacitor 7 of the motor 3 is converted into a pulse and input to the control means 1. The operation display means 8 is for inputting operation settings such as turning on / off of the AC power supply 9, washing, rinsing, dehydration, etc., reservation settings, and the like, and displaying the operation state.

In the above configuration, the voltage induced at both ends of the phase advance capacitor 7 during the inertial rotation of the motor 3 is
This voltage waveform is correlated with the rotation speed of the
Since the pulse width converted by the above has a correlation with the rotation speed of the motor 3, the output of the waveform shaping means 6 is input to the control means 1, and the rotation speed of the motor 3, that is, The number of rotations of the washing and dewatering tub can be detected.

Next, the operation of controlling the number of revolutions of the washing and dewatering tub during the intermittent dehydration operation will be described with reference to FIGS. 7 and 8. When the control means 1 enters the intermittent dehydration step, the control means 1 executes step 41 in FIG. Then, a motor control output as shown in FIG. 8A is output to turn on the motor 3 for a certain period of time to increase the rotation speed of the washing and dewatering tub. At time t0 in FIG. 8, the motor 3 is turned off, and in step 42, the period T1 of the output pulse from the waveform shaping means 6 immediately after the motor 3 is turned off as shown by the solid line in FIG.

From this period T1, the number of revolutions N of the washing and dewatering tub is
t is calculated, and in step 43, the number of revolutions N of the washing and dewatering tub
It is determined whether or not t is equal to or more than the target rotation speed Nref,
If the target rotation speed has not been reached, the process returns to step 41, and the rotation speed is increased again. If the target rotation speed has been reached, this series of operations ends, and the flow proceeds to the next step.

[0007]

However, in the above-described conventional configuration, the output pulse from the waveform shaping means 6 immediately after the motor 3 is turned off depends on the phase of the AC power supply 9 when the motor 3 is turned off. As shown by the broken line in b), a pulse synchronized with the power supply frequency may be generated.

On the other hand, the control means 1 calculates the number of revolutions of the washing and dewatering tub by measuring the period of the output pulse from the waveform shaping means 6 immediately after the motor 3 is turned off.
When a pulse synchronized with the power supply frequency as shown by the broken line in FIG. 8B is generated, the period T1 'from this pulse is measured, and it is determined that the rotation speed is different from the actual one. Had a problem.

Further, since the failure of the waveform shaping means 6 is not detected, it is determined that the required number of revolutions has not been reached even when the waveform shaping means 6 has failed, and the control of the number of revolutions of the washing and dewatering tub is performed for a long time. Sometimes it took time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its first object to improve the accuracy and reliability of detecting the rotation speed of a washing and dewatering tub, and to improve the accuracy of rotation speed control.

It is a second object of the present invention to detect a failure of the waveform shaping means and perform the subsequent operation without detecting the rotational speed when the failure is detected.

A third object is to detect a failure of the waveform shaping means and display an abnormal state.

[0013]

According to the present invention, there is provided a motor for driving a washing and dewatering tub.
Operation display means for inputting and displaying operation and settings, waveform shaping means for shaping the voltage induced at both ends of the phase advance capacitor of the motor, and power supply synchronizing signal generation for generating a signal synchronized with the AC power supply Means, and control means for sequentially controlling each step of washing, rinsing, and dehydration, wherein the control means has a predetermined delay time synchronized with the output of the power supply synchronization signal generating means when the motor is turned off during operation. The first problem-solving means is to measure the period of the output pulse of the waveform shaping means after elapse of the period and to detect the rotation speed of the washing and dewatering tub.

[0014] In order to achieve the second object, the control means of the first means for solving the problems measures the number of output pulses of the waveform shaping means when the motor during operation is off, and determines the number of output pulses. When the number is equal to or less than the threshold value, the second problem solving means is to increase the rotation speed of the washing and dewatering tub at a predetermined on / off cycle during the intermittent dehydration operation.

[0015] To achieve the third object, the control means of the first means for solving the problem measures the number of output pulses of the waveform shaping means when the motor during operation is off, and determines the number of output pulses. When the number is equal to or smaller than the threshold value, the operation display means notifies the user of an abnormal state, as a third means for solving the problem.

In order to achieve the second object, in addition to the first means for solving the above-mentioned problems, there is provided a storage means for storing the contents of abnormalities and the like. The number of output pulses of the waveform shaping unit is measured, and when the number of output pulses is equal to or less than the threshold, the fact that the waveform shaping unit is in a failure state is stored in the storage unit, and the subsequent operation is determined in advance. Performing in a given fixed sequence is a fourth problem solving means.

[0017]

According to the first aspect of the present invention, there is provided:
After a certain delay time synchronized with the output of the power supply synchronizing signal generation means has elapsed, to measure the period of the output pulse of the waveform shaping means, immediately after the motor is turned off, even if a pulse synchronized with the power supply frequency is generated, The rotation speed of the washing and dewatering tub can be detected with high accuracy without being affected by the pulse.

According to a second aspect of the present invention, when the measured number of output pulses of the waveform shaping unit is equal to or smaller than a threshold value when the motor is turned off during operation, it is determined that the waveform shaping unit has failed. In the event of a failure, the rotation speed of the washing and dewatering tub can be increased at a predetermined ON / OFF cycle.

According to a third aspect of the present invention, when the measured number of output pulses of the waveform shaping unit is less than or equal to a threshold value when the motor is turned off during operation, it is determined that the waveform shaping unit has failed. When a failure occurs, the failure of the waveform shaping means can be displayed on the operation display means.

According to a fourth aspect of the present invention, when the measured number of output pulses of the waveform shaping unit is equal to or smaller than a threshold value when the motor is turned off, it is determined that the waveform shaping unit has failed. When a failure occurs, the failure of the waveform shaping means is stored in the storage means, and the subsequent operation can be performed in a fixed sequence.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG.
0 generates a signal synchronized every half cycle of the AC power supply 9 and inputs the signal to the control means 11. The control means 11
The washing, rinsing, and dehydrating processes are sequentially controlled via the power switching means 2 and the motor 3 during operation is controlled.
When a predetermined delay time synchronized with the output of the power supply synchronizing signal generating means 10 elapses, the period of the output pulse of the waveform shaping means 6 is measured, and the rotation speed of the washing and spin-drying tub is detected. I have.

The operation of controlling the rotation speed of the washing and dewatering tub during the intermittent dehydration operation will be described with reference to FIGS. When the control unit 11 enters the intermittent dehydration process,
In step 21 of FIG. 2, a motor control output as shown in FIG. 3A is output to turn on the motor 3 for a certain period of time to increase the rotation speed of the washing and dewatering tub. At time t0 in FIG.
Is turned off, and immediately after the motor 3 is turned off in step 22, a delay time Td corresponding to two pulses of the output pulse of the power supply synchronizing signal generating means 10 as shown in FIG. The period T2 of the output pulse from the waveform shaping means 6 after a lapse of a predetermined time Td from the turning-off of the signal is measured.

From this cycle T2, the number of revolutions N of the washing and dewatering tub
t is detected, and in step 24, it is determined whether or not the rotation speed of the washing and dewatering tub has reached the required rotation speed Nref. If not, the process returns to step 21 and the rotation speed is increased again. . If the required speed is reached,
This series of operations ends, and the process proceeds to the next step.

As described above, according to this embodiment, the control means 1
1 measures the cycle of the output pulse of the waveform shaping means 6 after a certain delay time synchronized with the output of the power supply synchronizing signal generating means 10 when the motor 3 is turned off during the operation, and measures the rotation of the washing and dewatering tub. Since the number is detected, FIG.
As shown by the dashed line in (c), even when a pulse synchronized with the power supply frequency is generated due to the phase of the AC power supply 9 when the motor 3 is turned off, the output pulse from the waveform shaping means 6 is independent of this pulse. The period T2 can be measured,
It is possible to prevent the rotation speed from being different from the actual rotation speed, and it is possible to more reliably detect the rotation speed of the washing and dewatering tub.

Next, a second embodiment of the present invention will be described. The control unit 11 in FIG. 1 measures the number of output pulses of the waveform shaping unit 6 when the motor 3 is turned off during the washing operation, and when the number of output pulses is equal to or less than the threshold, during the intermittent dehydration operation, The rotation speed of the washing / dewatering tub is increased at a predetermined on / off cycle. Other configurations are the same as those of the first embodiment.

The operation of the above configuration will be described with reference to FIG. 4. In the washing process, the control unit 11 determines in step 31 the number Np of output pulses from the waveform shaping unit 6 per fixed time when the motor 3 is turned off. Is counted, and in step 32, the number Np of output pulses is compared with the threshold value Nth. If the number Np of output pulses is larger than the threshold value Nth, it is determined that the operation of the waveform shaping means 6 is normal. Then, the process proceeds to a step 33, wherein the rotation speed detection and the rotation speed control of the washing and dewatering tub in the subsequent intermittent dewatering process are performed as in the first embodiment.

If the number Np of output pulses is smaller than the threshold value Nth at step 32, it is determined that the waveform shaping means 6 is in a failure state, and the routine proceeds to step 34, where washing and washing during the intermittent dehydrating operation are performed. The rotation speed of the spin-drying tub is not detected, and the rotation speed of the washing and spin-drying tub is increased at a predetermined ON / OFF cycle.

As described above, according to this embodiment, the control means 1
1 measures the number of output pulses of the waveform shaping means 6 when the motor 3 is turned off during the washing operation, and when the number of output pulses is equal to or less than the threshold value, a predetermined on / off operation is performed during the intermittent dehydration operation. Since the number of revolutions of the washing and dewatering tub is increased periodically, the failure of the waveform shaping means 6 can be determined when the number of output pulses of the waveform shaping means 6 is equal to or less than the threshold value. In the event of a failure, the rotation speed of the washing and dewatering tub can be increased at a predetermined on / off cycle,
It is possible to prevent the rotational speed control from being performed for a long time at the time of failure.

When the motor 3 is turned off during operation, the number of output pulses of the waveform shaping means 6 is measured. If the number of output pulses is equal to or less than the threshold value, the operation display means 8 indicates an abnormal state. By letting you know about things,
The failure of the waveform shaping means 6 can be displayed on the operation display means 8.

Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in the figure, the storage means 12 is constituted by a non-volatile memory that retains the stored contents even when the power is turned off, and stores abnormal contents and the like. The control means 13 measures the number of output pulses of the waveform shaping means 6 when the motor 3 is turned off during the washing operation, and stores the waveform shaping means 6 in the storage means 12 when the number of output pulses is equal to or less than the threshold value. Is stored in a failure state, and the subsequent operation is performed in a predetermined fixed sequence without performing the rotation number detecting operation of the washing and dewatering tub.

In the above configuration, the number Np of output pulses of the waveform shaping means 6 is set to the threshold value Nth in step 32 of FIG.
If the number is smaller than the number, the waveform shaping unit 6 is stored in the storage unit 12.
Is stored in a failure state, and in the subsequent operation, the operation of detecting the rotation speed of the washing and dewatering tub is not performed, and the operation is performed in a predetermined constant sequence.

As described above, according to the present embodiment, the number of output pulses of the waveform shaping means 6 is measured when the motor 3 during operation is turned off, and when the number of output pulses is equal to or less than the threshold value, the output is stored. The fact that the waveform shaping means 6 is in a failure state is stored in the means 12, and the subsequent operation is performed in a predetermined constant sequence.
The failure of the waveform shaping means 6 is stored in the storage means 12, and the subsequent operation can be performed in a fixed sequence.

[0035]

As described above, the present invention provides a motor for driving a washing and spin-drying tub, operation display means for inputting and displaying operation and settings, and induction at both ends of a phase-advancing capacitor of the motor. Waveform shaping means for shaping the voltage, power supply synchronization signal generating means for generating a signal synchronized with the AC power supply,
Control means for sequentially controlling each step of washing, rinsing, and dehydration, wherein the control means has a predetermined delay time synchronized with the output of the power supply synchronization signal generation means when the motor is off during operation. Since the period of the output pulse of the waveform shaping means is measured later to detect the number of revolutions of the washing and dewatering tub, even if a pulse synchronized with the power supply frequency is generated immediately after the motor is turned off, the pulse is output from this pulse. Of the washing and dewatering tub with higher reliability can be prevented.

The control means measures the number of output pulses of the waveform shaping means when the motor during operation is turned off, and when the number of output pulses is equal to or less than the threshold value, the control means determines in advance during the intermittent dehydrating operation. Since the rotation speed of the washing and dewatering tub is increased in the on / off cycle, a failure diagnosis of the waveform shaping means can be performed. When the waveform shaping means fails, the rotation of the washing and dewatering tub in the intermittent dewatering process is performed. Without performing the number detection operation,
Since the rotation speed of the washing and dewatering tub is increased at a constant on / off cycle, it is possible to prevent the rotation speed control from being performed for a long time in the event of a failure.

The control means measures the number of output pulses of the waveform shaping means when the operating motor is turned off. If the number of output pulses is equal to or less than the threshold value, the operation display means displays an abnormal state. Because I tried to inform you of something,
Diagnosis of a failure of the waveform shaping means can be performed, and when a failure of the waveform shaping means occurs, the user can be notified by the operation display means.

[0038] The control means measures the number of output pulses of the waveform shaping means when the motor is turned off, and the number of output pulses is equal to or less than a threshold value. In the case of (1), the fact that the waveform shaping unit is in a failure state is stored in the storage unit, and the subsequent operation is performed in a predetermined constant sequence, so that the failure diagnosis of the waveform shaping unit is performed. When the waveform shaping unit fails, it is stored in the storage unit so that the rotation amount detection operation and other outputs of the waveform shaping unit are also used during the subsequent operation, such as the determination of the cloth amount and the cloth quality. It is possible to operate in a fixed sequence without performing the various detection operations described above.

[Brief description of the drawings]

FIG. 1 is a block diagram of a washing machine according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a rotation number detecting operation of the washing and dewatering tub of the washing machine.

FIG. 3 is an operation time chart at the time of detecting the rotation speed of the washing and dewatering tub of the washing machine.

FIG. 4 is a flowchart showing the operation of the washing machine according to the second embodiment of the present invention.

FIG. 5 is a block diagram of a washing machine according to a third embodiment of the present invention.

FIG. 6 is a block diagram of a conventional washing machine.

FIG. 7 is a flowchart showing an operation of detecting the number of revolutions of the washing and dewatering tub of the washing machine.

FIG. 8 is an operation time chart at the time of detecting the number of revolutions of the washing and dewatering tub of the washing machine.

[Explanation of symbols]

 Reference Signs List 3 Motor 6 Waveform shaping means 7 Phase leading capacitor 8 Operation display means 9 AC power supply 10 Power supply synchronizing signal generating means 11 Control means

 ──────────────────────────────────────────────────の Continued on the front page (72) Noriko Ikeda 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Katsuyuki Nagai 1006 Kadoma Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (56) References JP-A-4-129590 (JP, A) JP-A-4-256786 (JP, A) JP-A-4-108493 (JP, A)

Claims (4)

(57) [Claims] 1. A motor for driving a washing and spin-drying tub, operation display means for inputting and displaying operation and settings, and waveform shaping means for waveform shaping a voltage induced at both ends of a phase advance capacitor of the motor. Power supply synchronization signal generating means for generating a signal synchronized with the AC power supply, washing, rinsing, control means for sequentially controlling each step of dehydration, the control means, when the motor is off during operation, A washing machine in which after a certain delay time synchronized with the output of the power supply synchronization signal generation means elapses, the cycle of the output pulse of the waveform shaping means is measured, and the number of rotations of the washing and dewatering tub is detected. The control means measures the number of output pulses of the waveform shaping means when the motor is turned off during operation, and when the number of output pulses is equal to or less than a threshold value, the control means determines in advance the intermittent dehydration operation. 2. The washing machine according to claim 1, wherein the number of revolutions of the washing and dewatering tub is increased in an on / off cycle. 3. The control means measures the number of output pulses of the waveform shaping means when the motor during operation is turned off. If the number of output pulses is equal to or less than the threshold, the operation display means displays an abnormal state. Claim 1 which notifies that there is something
The washing machine as described. 4. A storage means for storing the contents of abnormalities and the like, wherein the control means measures the number of output pulses of the waveform shaping means when the motor during operation is off, and the number of output pulses is equal to or less than a threshold value. 2. The washing machine according to claim 1, wherein in the case of (1), the storage means stores that the waveform shaping means is in a failure state, and the subsequent operation is performed in a predetermined constant sequence.