JP2588992B2 - Operation control method of stirring type washing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for setting a stop time of a stirring blade of a stirring type washing machine, in particular.

[Prior Art] FIGS. 3 and 4 show an example of a stirring type fully automatic washing machine having an agitator. In FIG. 3, (5) shows a hollow cylinder having a large number of through holes. Vertical stirring blades (5
a) an agitator as a rotor provided radially;
(4) is a washing and dewatering tub having the agitator (5) disposed at the center thereof and having a dehydration hole (28) on the side wall, and a water receiving tub (27) disposed outside the washing and dehydration tub (4). I do.

In the figure, (19) shows a motor disposed below the water receiving tank (27), which is connected to the rotation transmitting unit (34) via a small pulley (30), a V-belt (31) and a large pulley (32). connect.
The rotation transmitting portion (34) has a double drive shaft (35) (36) switched by a spring clutch mechanism (33), and the outer drive shaft (35) is connected to the washing and spin-drying tub (4). Drive shaft (36)
Bind to the agitator (5) respectively.

On the non-load side of the motor (19), a motor rotation detection circuit (15) having a speed generator (26) composed of a coil and an electromagnet as means for detecting rotation of the motor (19)
(Not shown in FIGS. 3 and 4).

These mechanisms are housed in the outer box (1) via a vibration-proof means such as a hanging bar provided with a vibration-proof spring. The operation panel (3) is provided on the upper surface of the outer box (1), The upper part of the upper opening of the dewatering tank (4) is covered with a lid (2).

In the figure, (29) is a balancer attached to the upper edge of the washing and dewatering tub (4), (6) is a drain hose, (7) is a power cord,
(8) indicates a ground wire.

FIG. 5 is a control circuit diagram of the washing machine. A drive circuit of a motor (19), a water supply valve (20), and a torque motor (21) are connected in parallel to a power supply (18) of AC100V. A control device (9) using a microcomputer is connected to (18) via a constant voltage power supply circuit (22).

(17) in the figure is an AC clock circuit (17) provided between the constant voltage power supply circuit (22) and the control device (9).

The input terminal of the control device (9) has an oscillation circuit (10),
Clock oscillation circuit (11), reset circuit (12), operation switch (14) provided on operation panel (3), speed generator (2
Motor rotation detection circuit (15) having 6), lid (2)
The lid switch (16) and the water level sensor (23) for detecting the opening and closing of the water are connected.

On the other hand, the output terminal of the control device (9) has a
LED (light emitting diode) lamp (13b) and other LED lamps (13a) are connected via the driving IC circuits (25) and (37), and other external component drive circuits (24) are connected .

Next, the driving operation will be described with reference to the flowchart of FIG.

First, wash and dehydrate the laundry with a certain amount of detergent (4)
When the operation is started by operating the operation switch (14), the water supply valve (20) is opened and water is poured into the water receiving tank (27) and the washing and dewatering tank (4), and the water level sensor ( When water is supplied to the specified water level by the output from 23), water supply is stopped.

Then, a motor control process is started in which the motor (19) is energized by the output from the control device (9) to perform a forward / reverse inversion operation.

The forward / reverse operation of this motor (19) is controlled by a small pulley (3
0), the V-belt (31), the large pulley (32), the rotation transmitting section (34), and the drive shaft (36) are transmitted to the agitator (5), and the agitator (5) and the stirring blade (5a) swing. The laundry is moved and agitated to wash the laundry.

In this case, the rotation transmitting unit (34) and the spring clutch mechanism (3
3) rotates only the drive shaft (35), and the drive shaft (3
6) does not rotate and the washing and dewatering tub (4) remains stopped.

When the motor (19) rotates, the speed generator (26) also rotates, and the generated voltage, which is a sine waveform output from its coil, is converted into a 5V waveform shaping voltage by the motor rotation detection circuit (15), and a square wave is generated. The pulse is input to the control device (9).

FIG. 7 shows the relationship between the movement of the motor (19) and the pulses generated by the speed generator (26). The number of pulses from the speed generator (26) (pulse generator: PG) is one.
It is determined that the motor (19) has made one revolution with six pulses, and when the number of pulses reaches, for example, the 89th pulse, the motor (19) turns to 5.
It is determined to be 5 revolutions.

When the number of pulses reaches 128, it is determined that eight rotations, that is, a so-called specified number of rotations have been made (steps a and b), and the power supply to the motor (19) is stopped (step d). Even if the motor (19) does not make eight rotations, the power supply to the motor (19) is stopped even when the power supply time to the motor (19) reaches 600 msec (Steps C and D).

Even after the power supply to the motor (19) is stopped, the motor (19) and the agitator (5) continue to rotate.

As shown in FIG. 8, the speed generator (26) outputs a pulse due to this inertia.

Conventionally, as a method of detecting the stop determination time,
First, the controller (9) counts the inertia pulse after the power supply to the motor (19) is stopped, and when 16 pulses are generated within 230 msec (for example, when this time is 100 msec)
(Step E, F), the stop determination time and the inertial pulse count up to that time are once cleared (Step E).

Next, the subsequent stop determination time is the specified time of 180 mse
When c (this time is usually the time until the motor (19) and the agitator (5) are completely stopped) (step e), the motor (19) and the agitator (5) are completely stopped once. The motor (1
9) Energize in the opposite direction to the previous one (step, re,
Nu).

[Problems to be solved by the invention]

As described above, as a method of detecting the stop determination time after the power supply to the motor is stopped, conventionally, the determination is mainly made based on whether or not a preset specified time has been reached. Acts on the agitator as a load. As a result, if the amount of laundry is large, the load is large, and the agitator and the motor stop before the stop determination time is reached.

However, when the amount of water is large despite the large amount of laundry, the laundry moves freely in the water, which acts as the inertia of the agitator. In some cases, a so-called breathing phenomenon in which the reversal of the stirring blade is delayed may occur.

In addition, when the time until the motor stops is short, the resolution is rough in the detection of the stop only once.

An object of the present invention is to solve the disadvantages of the conventional example, prevent the occurrence of a breathing phenomenon of the stirring blade, obtain an appropriate stop determination time commensurate with the amount of laundry, and smoothly reciprocate the stirring blade. An object of the present invention is to provide an operation control method of a stirring type washing machine capable of securing a reversing motion and a good washing efficiency.

[Means for solving the problem]

In order to achieve the above object, the present invention is provided with a stirring blade after the power supply to the drive motor is stopped, a rotation speed detecting means for detecting a rotation speed due to the inertia of the drive motor, and alternately rotating the stirring blade forward and reverse to perform washing. In the stirring type washing machine, after the power supply to the motor is stopped, the number of inertia pulses of the number of pulses generated per rotation of the motor is not detected within a specified time, or after a predetermined stop determination prohibition time has elapsed,
The gist of the invention is to start energization of the motor in the opposite direction when the period of the inertia pulse becomes equal to or longer than a predetermined value.

[Action]

According to the present invention, during the stop determination prohibition time immediately after stopping the power supply to the motor, before the inertia pulses for, for example, 16 pulses per one rotation of the motor are counted, the predetermined stop determination is prohibited due to the amount of laundry or the like. Time (eg 120msec)
Is reached, the process proceeds to the next stop determination step.

And even in the stop determination step, even if the predetermined stop determination time set as the time until the motor normally completely stops does not reach, for example, 230 msec, the interval between the inertial pulses is equal to or more than a predetermined value, for example, 110 msec or more. If you open it,
The motor is determined to have completely stopped, the stop determination is terminated, and the process proceeds to the next motor energization.

As a result, the stirring blade reciprocates smoothly without making the motor stop determination time longer than necessary.

〔Example〕

Hereinafter, an embodiment of an operation control method of a stirring type washing machine of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a flowchart showing the operation of an embodiment of a method for controlling the operation of a stirring type washing machine according to the present invention. FIGS. 3 to 5 show a stirring type fully automatic one-tank type washing machine in which the method of the present invention is carried out. Is the same as that already described, and a detailed description thereof will be omitted.

A method of performing washing using such a washing machine will be described with reference to the flow chart of FIG. 1. First, a laundry and a certain amount of detergent are put into a washing and dewatering tub (4) as in the prior art, and then up to a specified water level. Supply water and energize the motor (19) (step).

When the motor (19) rotates, the speed generator (26) also rotates, and pulses coming out of the motor (19) are counted by the control device (9), and the number of pulses counted (for example, 89) causes the motor (19) to perform a specified number of times. (For example, 5.5 times) If it is determined that the motor has rotated in one direction (step ヲ), the motor (1
9) Turn off the power to the unit. Alternatively, even if the motor (19) has not been rotated a specified number of times, when the specified maximum operation time (for example, 450 msec) of the motor (19) has been reached (steps I and W). Also in this case, the power supply to the motor (19) is stopped.

Even after the power supply to the motor (19) is stopped, the motor (19),
Since the agitator (5) continues to rotate due to inertia, the next time the motor (19) is energized in the opposite direction, it waits for the motor (19) to completely stop, and thus determines the stop time.

The stop time is determined when the motor (19) makes one rotation and 16 inertia pulses, which is the normal number of pulses for one rotation, are generated (stepper). The count is cleared once (step), and the counting of a prescribed stop determination time (for example, 230 msec) is started (step YO).

In this case, even if the rotation of the motor (19) does not stop and the number of inertia pulses has not yet been generated (stepper), the motor stop determination inhibition time set in advance (for example, 120 mse
When c) has elapsed (step S), the counting of the next prescribed stop determination time is started (step S).

As a result, it is possible to prevent a prolonged period of time from the stoppage of the power failure to the motor (19) to the start of counting of the prescribed stop determination time.

Next, when the prescribed stop determination time, for example, 230 msec, has elapsed (Step Y), it is determined that the motor (19) has almost completely stopped, and the motor (19) is determined to have stopped almost completely in the direction opposite to the previous energizing direction to the motor 19). Power is supplied to the motor (19) (stepne, na, la), and the stirring blade is turned over.

Also in this case, even if the specified stop determination time does not reach 230 msec, for example, the interval between the inertial pulses is set to a predetermined value, for example, 110 msec.
If it becomes c or more, it is determined that the motor (19) has almost completely stopped (steps), and the next energization is performed.

As a result, when the load is large and the motor (19) stops in a short time, it is possible to prevent the time until the start of the next energization from becoming unnecessarily long.

〔The invention's effect〕

As described above, in the operation control method of the stirring type washing machine of the present invention, when the stirring blades are reversed in the forward and reverse directions, the power supply stop time to the motor until the next reversal start is not lengthened, and the reversal of the stirring blades is prevented. It is possible to prevent the so-called breathing phenomenon, which is slow, from occurring, and to obtain a smooth reciprocating operation of the stirring blade.

Further, since the stop determination can be made based on two conditions, an accurate determination result can be obtained, and a stop time corresponding to the amount of laundry can be obtained, so that washing can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a flowchart showing the operation of the embodiment of the operation control method of the stirring type washing machine of the present invention, FIG. 2 is a waveform diagram when the power supply to the motor is stopped, and FIG. 3 is an external perspective view of the stirring type washing machine. 4, FIG. 4 is a longitudinal side view of the same, FIG. 5 is a control circuit diagram of the same, FIG. 6 is a flowchart showing the operation of the conventional example, FIG.
FIG. 8 is a waveform diagram when the motor is turned on, and FIG. 8 is a waveform diagram when the motor is stopped. (1) ... outer box, (2) ... lid (3) ... operation panel, (4) ... washing and dewatering tank (5) ... agitator, (5a) ... stirring blade (6) ... Drain hose, (7) Power cord (8) Ground wire, (9) Controller (10) Oscillator, (11) Oscillator for clock (12) Reset circuit ( 13a) LED (light emitting diode) lamp (13b) LED display for character display (14) Operation switch (15) Motor rotation detection circuit (16) Lid switch (17) ... AC clock circuit, (18) ... 100V AC power supply (19) ... Motor, (20) ... Water valve (21) ... Torque motor, (22) ... Constant voltage power supply circuit (23) ... Water level sensor , (24)… External part drive circuit (25) (37)… IC circuit for LED display (26)… Speed generator, (27)… water receiving tank (28)… dehydration hole, 29) Balancer (30) Small pulley, (31) V-belt (32) Large pulley, (33) Spring clutch mechanism (34) Rotation transmission unit (35) (36) ) ... Drive shaft

Claims (1)

(57) [Claims] 1. A stirring type washing machine in which a stirring blade after power supply to a driving motor is stopped and a rotation speed detecting means for detecting a rotation speed due to inertia of the driving motor are provided, and the stirring blades are alternately rotated forward and reverse to perform washing. After the power supply to the motor is stopped, the number of inertia pulses generated per one rotation of the motor is not detected within a specified time, or after a predetermined stop determination prohibition time elapses, the period of the inertia pulse becomes predetermined. A method for controlling the operation of a stirrer-type washing machine, characterized in that, when the value exceeds a predetermined value, the power supply to the motor is started in the opposite direction.