JPH04152975A - Operation control method for agitation type washing machine - Google Patents

Abstract

PURPOSE:To secure the smooth reciprocating backing motion of an agitating blade and the satisfactory washing efficiency by starting the electric power supplying in the opposite direction to a motor, when the number inertial pulses of the number of pulses is detected, or a prescribed stop decision time elapses in the case a prescribed stop decision inhibition time elapses, or an internal of the number of invetial pulses exceeds a prescribed value, after an electric power supplying to the motor is stopped. CONSTITUTION:Even after an electric power supplying to a motor 19 is stopped, the motor 19 and an agitator 5 turn continuously by inertia, therefore, at the time of executing the electric power supplying in the opposite direction to the motor 19, after waiting for a complete stop of the motor 19, the stop time is decided. In this case, even if the rotation of the motor 19 does not drop and 16 pieces of inertial pulses are not generated yet, when a motor stop decision inhibition time set in advance, for instance, 120msec elapses, counting of the next prescribed stop decision time is started. Subsequently, the prescribed stop decision time, for instance, 230msec elapses, it is decided that the motor 19 is stopped almost completely and the electric conduction is executed in the opposite direction to the previous electric power supplying direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of controlling an agitator-type washing machine, particularly for setting the stop time of an agitator blade.

(Prior art) Figures 3 and 4 show an example of an agitation-type fully automatic washing machine equipped with an agitator. Vertical stirring blades (5a
) as a rotor blade provided radially, (4)
is a washing and dehydration tank in which this agitator (5) is arranged in the center and a dehydration hole (28) is provided in the side wall.
4) A water receiving tank (27) is arranged outside.

In the figure, (19) shows the motor installed below the water tank (27), which is connected to the small pulley (30) and the V-belt (
The rotation transmission part (31) and the large pulley (32)
4) Connect to. This rotation transmission part (34) has a double drive shaft (35) which is switched by a spring clutch mechanism (33).
(36), the outer drive shaft (35) is connected to the washing and dewatering tank (4), and the inner drive shaft (36) is connected to the agitator (5).

On the opposite load side of the motor (19), a motor rotation detection circuit (26) having a speed generator (26) composed of a coil and an electromagnet is provided as a means for detecting the rotation of the motor (19).
15) Attach (not shown in Figures 3 and 4).

These mechanisms are housed in an outer box (1) via vibration isolating means such as hanging rods equipped with anti-vibration springs, and an operation panel (3) is provided on the top of this outer box (1). Dehydration tank (4)
Cover the top opening above with a lid (2).

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

Figure 5 is a control circuit diagram of the washing machine, including the AC100 power supply (18), the drive circuit for the motor (19), and the water supply valve (
20), a torque motor (21) is connected in parallel, and a microcomputer-based control device (9) is connected to a similar power source (18) via a constant voltage power source circuit (22).

In the figure, (17) is an AC 09 circuit (17) provided between this constant voltage power supply circuit (22) and the control device (9).

The input side terminal of the control device (9) includes an oscillation circuit (10),
A clock oscillation circuit (11), a reset circuit (12), an operation switch (14) provided on the operation panel (3), a motor rotation detection circuit (15) having a speed generator (26),
A lid switch (16) that detects opening and closing of the lid (2) and a water level sensor (23) are connected.

On the other hand, the output side terminal of the control device (9) is used for character display.
IC circuit (25) for driving ED (light emitting diode) lamps (13b) and other LED lamps (13a)
(37), and is also connected to other external component drive circuits (24).

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

First, put the laundry and a certain amount of detergent into the washing and dehydrating tank (4), operate the operation switch (14) to start operation, the water supply valve (20) opens, and water flows into the water receiving tank (27). and the washing and dehydrating tank (4), and the water level sensor (2)
When water is supplied to the specified water level by the output from 3), the water supply is stopped.

The motor (1) is controlled by the output from the control device (9).
9) starts a motor control process in which the motor is energized and performs forward/reverse operation.

The forward and reverse operation of this motor (19) is controlled by the small pulley (3).
0), ■The agitator (5
), the agitator (5) and the stirring blade (5a) swing to stir the laundry and wash the laundry.

In this case, the rotation transmission section (34) and the spring clutch mechanism (3
3) rotates only the drive shaft (35), the drive shaft (36) 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 the coil, is converted into a 5V waveform-shaped voltage by the motor rotation detection circuit (15), and a rectangular waveform is generated. Control device (9
) is entered.

Figure 7 shows the relationship between the movement of the motor (19) and the pulses from the speed generator (26).The number of pulses from the speed generator (26) (pulse generator: PG) is 16. It is determined that the motor (19) has rotated once, and when the number of pulses reaches, for example, the 89th pulse, it is determined that the motor (19) has rotated 5.5 times.

When the number of pulses reaches 128, it is determined that 8 rotations have been made, the so-called specified number of rotations (sten buoy).

(Snap), then stop the power supply to the motor (19) (Snap). In addition, even if the motor (19) does not rotate 8 times, the power supply to the motor (19) is also stopped when the power supply time to the motor (19) reaches 600 m5ec (Step C, 2).

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 pulses due to this inertia.

Conventionally, as a method of detecting the stop judgment time, the control device (9) first counts the inertia pulses after the power supply to the motor (19) is stopped, and when 16 pulses have been generated (this time is usually 10 seconds). ) (Sutesopho, to), once clear the stop judgment time and inertia pulse count up to that point (snapto).

Next, the subsequent stop judgment time is the specified time 1805
When the motor (19) and agitator (5) have completely stopped once the motor (19) and the agitator (5) have stopped completely, the motor (19) and the agitator (5) have completely stopped. Then, the motor (19) is energized in the opposite direction from the previous time (steps 1, 2, 3).

[Problem to be solved by the invention]

Conventionally, as a method of detecting the stop judgment time after the power supply to the motor is stopped, the judgment is mainly based on whether a preset specified time has been reached, but normally, during this stop judgment time, the laundry is acts on the agitator as a load, and as a result, the larger the amount of laundry, the greater the load.
The agitator and motor stop before the stop judgment time is reached.

However, when the amount of laundry is large and the amount of water is large, the laundry moves freely in the water, which acts as inertia on the agitator, slowing down and taking a long time to stop. However, the reversal of the stirring blades may be slow (so-called breathing phenomenon may occur).

Furthermore, when the time until the motor stops is short, the resolution is poor if only one detection is used as a detection method for determining the stoppage.

The purpose of the present invention is to eliminate the disadvantages of the conventional example, prevent the occurrence of the breathing phenomenon of the stirring blades, obtain an appropriate stop judgment time commensurate with the amount of laundry, and provide smooth reciprocation of the stirring blades. An object of the present invention is to provide a method for controlling the operation of an agitating washing machine that can ensure reversing motion and good cleaning efficiency.

[Means to solve the problem]

In order to achieve the above object, the present invention is provided with a rotation speed detection means for detecting the rotation speed due to the inertia of the stirring blade and the drive motor after the power supply to the drive motor is stopped, and washing is performed by alternately rotating the stirring blade in forward and reverse directions. In an agitation type washing machine, after the power supply to the motor is stopped, if the number of inertia pulses that are expected to occur per rotation of the motor is detected, or if the predetermined stop judgment prohibition time has elapsed, the next The gist of the present invention is to start energizing the motor in the opposite direction when a predetermined stop determination time has elapsed or when the interval between the number of inertial pulses exceeds a predetermined value.

[Effect]

According to the present invention, during the stop judgment prohibition time immediately after energization to the motor is stopped, a predetermined stop judgment is prohibited due to the amount of laundry, etc. before inertia pulses equivalent to, for example, 16 pulses generated per rotation of the motor are counted. time (e.g. 120m5
ec), the process moves to the next stop determination process.

Even in this stop judgment step, even if the predetermined stop judgment time, which is normally set as the time required for the motor to completely stop, has not reached, for example, 230 m5ec, the interval between inertial pulses is equal to or greater than a predetermined value, for example, 110+++ seconds or more. If it opens, it is determined that the motor has completely stopped, the stop judgment ends, and the next motor is energized.

As a result, the motor stop determination time does not become longer than necessary, and the stirring blades reciprocate smoothly.

[Example] Hereinafter, an example of the method for controlling the operation of an agitation type washing machine according to 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 the method for controlling the operation of an agitation type washing machine according to the present invention, and the fully automatic agitation type washing machine in which the method of the present invention is implemented is shown in FIGS. 3 to 5. Since this is the same as that already explained, detailed explanation will be omitted here.

To explain the method of washing using such a washing machine with reference to the flowchart shown in Fig. 1, first, as in the conventional case, after putting the laundry and a certain amount of detergent into the washing and dehydrating tank (4), the water is heated to the specified water level. Supply water and energize the motor (19) (
step).

When the motor (19) rotates, the speed generator (26) also rotates, and the pulses emitted from it are counted by the control device (9), and the motor (19) is activated a specified number of times based on the counted number of pulses (for example, 89). (For example, 5.5 times)
When it is determined that the motor (19) has rotated in one direction, the power supply to the motor (19) is stopped.

Alternatively, even if the motor (19) has not rotated the specified number of times, the specified maximum operating time of the motor (19) (for example, 4
50 m5ec) (step wo, wa). In this case as well, 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 until the motor (19) has completely stopped, and therefore the stopping time is determined.

To determine this stop time, first, the motor (19) rotates once and the inertia pulse is normally the number of pulses corresponding to one revolution, 16.
Once the stop judgment time and inertial pulse count have been generated (stepta), the stop judgment time and inertia pulse count up to that point are cleared once (stellar pre), and the specified stop judgment time (for example, 230 m5ec) is cleared.
) starts counting (step yo).

In this case, even if the motor (19) stops rotating and 16 inertial pulses have not yet been generated (stepper), the preset motor stop judgment prohibition time (for example, 12
When 0 + + + 5 ec) has elapsed (Step So), it starts counting the next specified stop judgment time (Step So).
.

This prevents a long period of time from when the power supply to the motor (19) is stopped to when counting of the prescribed stoppage determination time is started.

Next, this specified stop judgment time, for example, 230 m5ec
When the time has passed (step yo), it is determined that the motor (19) has almost completely stopped, and the previous motor (19) is
iI to the motor (19) in the opposite direction to the direction of energization to
! Step 1) and rotate the stirring blades in reverse.

In this case as well, the prescribed stop judgment time is, for example, 230m5ec.
Even if the interval between inertial pulses does not reach a predetermined value, e.g.
When it reaches 10m5ec or more, it is determined that the motor (19) has almost completely stopped (steps), and the next energization is performed.

This prevents the time until the next start of energization from becoming longer than necessary when the load is large and the motor (19) stops in a short time.

〔Effect of the invention〕

As described above, the method for controlling the operation of an agitator-type washing machine according to the present invention, when reversing the agitator blades in the forward and reverse directions, prevents the motor from being energized for a long time until the start of the next reversal. It can prevent the occurrence of the so-called breathing phenomenon that slows down the breathing.
Smooth reciprocating motion of the stirring blades can be obtained.

Furthermore, since the stoppage determination can be made based on two conditions, accurate determination results can be obtained, and the stoppage time can be determined according to the amount of laundry, allowing efficient washing.

[Brief explanation of drawings]

Fig. 1 is a flowchart showing the operation of an embodiment of the method for controlling the operation of an agitation type washing machine according to the present invention, Fig. 2 is a waveform diagram when the motor is stopped, and Fig. 3 is an external perspective view of the agitation type fully automatic washing machine. , Fig. 4 is a longitudinal side view of the same as above, Fig. 5 is a control circuit diagram of same as above, Fig. 6 is a flowchart showing the operation of the conventional example, Fig. 7 is a waveform diagram when the same as above motor is energized, and Fig. 8 is energizing of same as above motor. It is a waveform diagram at the time of a stop. (1)... Outer box (2)... Lid (3)
・・Operation panel (4)・Washing and dehydration tank (5)・
... Agitator (5a) ... Stirring blade (6) ...
Drainage hose (7)...Power cord (8)...Earth wire (9)...Control device (10)...Oscillation circuit (11)...Clock oscillation circuit (12)...
・Reset circuit (13a)...LED (light emitting diode) lamp (
13b) ---LED lamp for character display (14)...
・Operation switch (15)...Motor rotation detection circuit (16)...Lid switch (17)...AC clock circuit (18)...AC100V power supply

Claims (1)

[Claims] In an agitating washing machine that washes clothes by alternately forwarding and reversing the agitating blades, a rotation speed detection means is provided to detect the rotation speed due to the inertia of the agitating blades and the drive motor after the power supply to the drive motor is stopped. After stopping, whether the number of inertial pulses that are expected to occur per motor rotation is detected, or if the predetermined stop judgment prohibition time has elapsed, then whether the predetermined stop judgment time has elapsed. , or a method for controlling the operation of an agitator-type washing machine, characterized in that when the interval between the number of inertial pulses exceeds a predetermined value, energization to the motor in the opposite direction is started.