KR980009606A - Control method of eccentricity correction device of washing machine - Google Patents

Abstract

In order to provide an eccentricity correction device for a washing machine for detecting and correcting an eccentric state by detecting the number of revolutions of a motor during dewatering control in a washing machine, A water level detecting means for detecting a water supply amount and an air supply amount of the washing water supplied by the water supply valve control means, a drain valve control means for discharging the water of the washing tub to the outside, An eccentricity correction function associated with the eccentricity determination according to the detection of the number of revolutions connected to each of the means, and all functions related to the washing operation And a microcomputer for controlling the entire washing machine control system.

Description

Control method of eccentricity correction device of washing machine

1 is a control block diagram of a conventional washing machine dewatering control device.

FIG. 2 is a signal flow chart for dehydration control of a conventional washing machine.

FIG. 3 is a schematic control block diagram of the washing machine eccentricity correction device of the present invention. FIG.

FIG. 4 is a detailed circuit diagram of a washing machine eccentricity correction device according to an embodiment of the present invention; FIG.

FIG. 5 is a control flowchart illustrating an operation process according to an embodiment of the present invention; FIG.

FIG. 6 is a diagram showing a relationship between a motor rotation speed and time according to the present invention; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

10: Micom 20: Water level sensing means

40: drain valve control means 50: motor drive means

51: motor 60: rotational speed detecting means

61: optical element driving unit, 62: rotating disk

70: Water supply valve control means.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine, and more particularly, to an eccentricity correction device and a control method of a washing machine for detecting and correcting an eccentric state by detecting the number of revolutions of a motor during dewatering control.

FIG. 1 is a block diagram of a dewatering control apparatus of a conventional washing machine. As shown in FIG. 1, a drain valve control means 40 for controlling the opening and closing of a drain valve at the start of dewatering operation, A dewatering control means (30a) for controlling intermittent dewatering and main dewatering in the dewatering operation, a motor driving means (50) for rotating the washing tub in accordance with the dewatering progress signal, A safety switch sensing means 30b for detecting the eccentric state of the washing tub at the time of operation and a microcomputer 10 for controlling the legs 20, 30a, 30b, 40 and 50.

The operation of the conventional device will be described below with reference to a signal flow chart of the dehydration control.

First, when the microcomputer 10 recognizing the completion of the washing operation outputs a dewatering signal, the drain valve control means 40 opens the drain valve to discharge water from the washing tub, and the water level sensing means 20 detects the water level of the washing tub do. At this time, the microcomputer 10 senses the airflow through the water level sensing means 20 and outputs a dehydration progress signal to the motor driving means 50 after a predetermined time (1 minute 30 seconds) to rotate the washing tub.

Accordingly, the dewatering control means 30a repeats the operation of turning on the motor for 3 seconds and then turning it off for 7 seconds three times, then turning on the motor for 3 seconds and then turning off the motor for 3 seconds, And the main dewatering operation is performed for 7 minutes, and then the dewatering operation is completed.

Meanwhile, when the washing tub is eccentric in case of intermittent dehydration and main dehydration, when the safety switch sensing means 30b senses the dehydration and applies it to the microcomputer 10, the microcomputer 10 temporarily stops the motor rotation and performs dehydration control again At this time, if eccentricity is sensed, the process of temporarily stopping the motor rotation and performing dehydration control again is repeated.

However, in such a conventional apparatus, there is a problem that a separate safety switch for detecting the eccentricity of the washing tub is required.

Also, there is another problem that the excessive rotation and stopping operation of the motor for correcting the eccentricity of the washing tub is repeated, the temperature of the motor is rapidly increased, and the dewatering completion time is prolonged and the dewatering effect is lowered. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to determine the presence or absence of eccentricity and correct the eccentricity by detecting the number of revolutions of the motor for rotating the washing tub without providing a separate safety switch for detecting the eccentric state . Another object of the present invention is to prevent the overheating of the motor and the delay of the dehydration time by avoiding the repetition of the excessive rotation and stopping operation of the motor, thereby increasing the dehydration effect. In order to accomplish the above object, the present invention provides a process for draining water from a washing tub to perform dewatering by driving a motor after detecting the airborne water, the method comprising driving a motor for a predetermined time, (S6) of increasing the number of rotations when the reference number of rotations reaches the reference number of rotations and terminating the operation at a high speed (S6); and stopping the motor (S7-S9) for correcting the eccentricity in the washing tub by rinsing and rinsing the washing tub by rotating the washing tub a predetermined number of times, and returning to the motor driving step (S1) for dewatering Feature.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a schematic control block diagram of a washing machine eccentricity correction apparatus according to the present invention, which includes a water supply valve control means 70 for controlling the opening and closing of the water supply valve so that the wash water is supplied to the washing tub, A drain valve control means 40 for discharging the water of the washing tub to the outside, a motor driving means 50 for rotating the washing tub at the time of dewatering, A rotation number detecting means 60 for detecting the number of rotations of the motor of the motor driving means 50 and applying the detected rotation number to the microcomputer 10 and connected to each of the means 20, 40, 50, 60, And a microcomputer 10 for controlling the entire washing machine control system so as to perform the eccentricity correction function and the related functions related to washing in the eccentricity determination based on the detection of the number of rotations.

FIG. 4 is a detailed circuit diagram of a washing machine eccentricity correction apparatus according to an embodiment of the present invention. The water supply valve V2 is opened and closed by controlling the transistor Q3 and the triac T2 by the microcomputer 10, (R1 to R5), capacitors (C1 and C2), a coil (L), inverters (I1 and I2) and a transistor (Q1) The water level detecting means 20 for generating the natural oscillation frequency and the water supply valve control means 70 for opening and closing the drain valve V1 through the control of the triac T1, A motor drive means 50b for rotating the motor 51 by driving the relay RY and an optical element driving section 61 for controlling the light emission of the light emitting element LED (PHOTO-TR) for detecting an intermittent state of a light source emitted from the light emitting device (LED) and applying the light to the microcomputer, A rotational speed detecting means 60 which is installed between the light emitting element LED and the photoreceptor PHOTO-TR and is composed of a rotating circular plate 62 rotating in interlock with the motor 51; , 50, 60, and 70 to control the overall performance of the washing machine.

FIG. 5 is a control flowchart for explaining an operation procedure according to an embodiment of the present invention. FIG. 5 is a flowchart illustrating an operation procedure according to an embodiment of the present invention. Referring to FIG. 5, (S1) of driving the motor (51) to rotate the washing tub, and determining whether the reference rotation speed (300 rpm) has been reached after 3 seconds have elapsed (S2, S3 (S4) of increasing the number of revolutions when the reference number of revolutions has been reached, for example, at a number of revolutions of 1600 rpm (S4), and terminating the process; stopping the motor S5), the water supply is performed again (S6), the rinse is performed by rotating the washing tub 4 to 5 times (S7), the drainage is performed (S8), the eccentricity is corrected, and the process returns to the motor driving step S1 for dewatering, (S3-S6).

FIG. 6 is a diagram showing the relationship between the motor rotation speed and time according to the present invention. In the case of the normal rotation of the motor, the rotation speed reaches about 3 seconds and the reference rotation speed (300 rpm) The reference rotational speed can not be reached.

The operation and effect of the present invention will be described in detail as follows.

Referring to FIGS. 3 to 6, when the washing operation is completed, the microcomputer 10 outputs a low signal to the drain valve control means 40 through the P2 terminal to drain water in the washing tub (S1) . That is, the drain valve control means 40 composed of the resistors R6, R7 and R8, the transistor Q2, the triac T1, the condenser C3 and the water supply valve V1 is connected to the P2 terminal of the microcomputer 10 A low signal connected to the P2 terminal outputs the transistor Q2 through the resistors R7 and R8. At the same time, a trigger signal is applied to the gate of the triac T1 to turn on the triac T1, so that the power source AC is applied to the drain valve V1 to open the drain valve V1, . When water is discharged by the above process, the water level sensing means 20 senses the level of the washing tub and applies the sensed level to the microcomputer 10. At this time, the water level sensing means 20 moves the iron core (not shown) of the pressure sensor coil L according to the water level of the washing tub and changes the reactance value of the coil L, The oscillation signal is intermittently turned on through the resistor R3 to intermittently turn on the transistor Q1 so that the P1 terminal of the microcomputer 10 is oscillated through the resistor R5, Square wave is input. In the water level sensing means 20, a predetermined natural frequency is generated along the water in the washing tub and inputted to the P1 terminal of the microcomputer 10, so that the microcomputer 10 reads the predetermined oscillation frequency and determines the water level. Accordingly, when the microcomputer 10 senses the airborne state, a high signal is output to the motor driving means 50 at the terminal P3, and the relay RY is turned on by the inverted signal through the inverter I3, And the motor 51 rotates the washing tub (S2, S3). Thereafter, it is determined whether the motor 51 has been rotated for 3 seconds, for example, and reached the reference rotation speed (300 rpm) through the rotation number detecting means 60 (S4, S5).

In more detail, the rotation disc 62 connected to the motor 51 is simultaneously rotated by the rotation of the motor 51. In addition, the optical element driver 61 is driven according to a control signal output from the P4 terminal of the microcomputer 10, so that the light emitting element (LED) periodically emits a constant light source.

Therefore, light emitted from the light emitting device (LED) is passed or blocked by the hole formed in the rotary disk 62. The photodetector PHOTO-TR senses the intermittent light, generates an electric signal, The microcomputer 10 counts the number of clock pulses input from the P5 terminal to determine the correct number of rotations.

When the detected number of revolutions reaches 300 rpm, the motor rpm is continuously increased and the high-speed dehydration is performed at 1600 rpm (S6). In this case, the dehydration is completed within a short time. Otherwise, (300 rpm), it is determined that the washing tub is eccentric and the eccentricity correction function is performed.

In order to correct the eccentricity, first, the motor 51 is stopped and water supply is performed through the water supply valve control means 70 (S7, S8).

In this case, unlike watering for washing, a certain amount of water is supplied to untangle the laundry. That is, the water valve control means 70 composed of the resistors R9, R10 and R11, the transistor Q3, the triac T2, the condenser C4 and the water supply valve V2 is connected to the terminal P6 of the microcomputer 10 A low signal connected to the P6 terminal turns on the transistor Q3 through the resistors R9 and R10. At the same time, the trigger signal is applied to the gate of the triac T2 so that the triac T2 is turned on, the power supply AC is applied to the water supply valve V2 to open the water supply valve V2, do.

Thereafter, the motor 51 is rotated about 4 to 5 times to release the tangles of the laundry, rinsing is performed, and drainage is performed by opening the drain valve to uniformly place the laundry in the washing tub to remove the factor of eccentricity (S9 , S10).

After performing the above-described process, the motor is returned to the motor driving step S3 for dewatering again to rotate the motor, and then the dewatering is completed through the normal dewatering step S4S6.

Accordingly, the present invention has an effect of detecting the number of revolutions of the motor for rotating the washing tub, determining whether there is an accurate eccentricity, correcting the eccentricity, and completing a normal dehydration process without providing a separate safety switch for detecting the eccentric state.

Further, by avoiding repetition of excessive rotation and stopping operation of the motor, there is another effect of preventing the motor from overheating and delaying the dewatering time, thereby raising the dewatering effect.

The above description is only an embodiment of the present invention and can be modified within the scope of the present invention.

Claims (1)

(S3, S4) of determining whether the reference rotation speed has been reached after driving the motor for a predetermined time in order to rotate the washing tub in a process of draining water from the washing tub and driving the motor to drive the motor (S6) of increasing the number of revolutions when the reference number of revolutions has been reached, terminating the operation at a high speed by releasing the number of revolutions (S6), stopping the motor when the reference number of revolutions is not reached, (S7-S9) of correcting the eccentricity in the washing tub by performing rinsing and rinsing in the number of times and returning to the motor driving step (S1) for dewatering through the drainage, Way. ※ Note: It is disclosed by the contents of the first application.