KR20040051239A - method for sensing unbalance of washing machine - Google Patents

Abstract

PURPOSE: An eccentricity detecting method of a drum-type washing machine is provided to improve performance of detecting eccentricity by detecting an eccentric value with using speed change by an open loop method and spreading the laundry to obtain conditions for accurately detecting the eccentricity through a closed loop method. CONSTITUTION: An eccentricity detecting method of a drum washing machine is composed of steps for performing constant velocity control for a first set time when the speed of a motor reaches a target speed by accelerating the motor with a closed loop control method; driving the motor for a second set time by an open loop method after the first set time and computing data for the speed of the motor at the constant period; computing acceleration data by adding up the continuous speed data as a predetermined unit and subtracting a sum value of following units from a sum value of previous units; computing eccentricity data by dividing the continuous acceleration data into predetermined units and subtracting a minimum acceleration data from a maximum acceleration data for each unit; and detecting a final eccentricity value by dividing the continuous eccentricity data into the predetermined units and adding up the eccentricity data for each unit.

Description

Method for sensing eccentricity of drum washing machine

The present invention relates to a drum washing machine, and more particularly, to an eccentric detection method of a drum washing machine.

In general, the drum washing machine is widely used with the advantage of the least damage to the laundry and the minimum amount of water consumed compared to other types of washing machines, as shown in Figure 1, the body (1), the inside of the main body (1) Tub 2 fixed by a damper (not shown), laundry is introduced into the tub 2 and the drum 3 rotates by receiving the driving force of the motor 10 through the belt 11 and rotating the laundry. , Thermistor (4) for measuring the temperature of the washing water supplied to the drum (3), detergent container (5) for introducing detergent, the detergent container (5) is connected to the washing water or detergent of the detergent container (5) is mixed A water supply pipe 6 for supplying the washed water, a drain pipe 7 for discharging the washing water used in the washing stroke to the outside, a pump 8 for forcibly pumping the wash water connected to the end of the drain pipe 7 and drainage Configured with a hose (9) .

And when looking at the basic operation of the drum washing machine configured as described above, first the user opens the door (not shown) attached to the front of the main body 1, put the laundry and then enter the washing command, the washing water through the detergent container (5) Guided by the water supply pipe 6 is filled in the drum (7).

Subsequently, the water level sensor detects that the washing water is filled by the set water level corresponding to the loaded laundry, and outputs the detected value to the controller.

The control unit recognizes the completion of water supply according to the detected value and drives the motor 10 to rotate the drum 3 to proceed with washing.

On the other hand, when the washing is completed, the pump 8 is operated so that the washing water is drained to the outside via the drain pipe 7 and the drain hose 9, and when the draining is completed, the rinsing and dehydration stroke are continuously performed, and the washing administration ends do.

At this time, in order to perform the dehydration stroke, the eccentricity detection must be performed first, and the eccentricity detection is performed by accelerating the motor to the target speed in an open loop and checking the change of the quantity during the acceleration section.

The eccentric detection method of the drum washing machine according to the prior art is made by accelerating the motor with a dog loop, and since the acceleration does not reach the target speed linearly and shows an irregular change, the washing cloth does not spread evenly, so accurate eccentric detection is not achieved. There is a problem.

In addition, when dehydration proceeds in a state where eccentricity detection is not made correctly, a noise occurs due to the vibration of the tub, and a walking phenomenon occurs in which the washing machine moves from its original position. It can also lead to breakage.

Accordingly, an object of the present invention is to provide an eccentric detection method of a drum washing machine, which is designed to solve the above-mentioned problems.

1 is a view showing the structure of a general drum washing machine

Figure 2 is a timing diagram showing an eccentric detection process of the drum washing machine according to the present invention

3 is a timing diagram illustrating an eccentric detection method of a drum washing machine according to the present invention.

The present invention is to accelerate the motor in a closed loop control method to perform a constant speed control for a first set time when the target speed is reached, and to drive the motor in an open loop method for a second set time when the first set time elapses. Calculating the motor speed data at a predetermined period, calculating the acceleration data by adding the continuous speed data in a predetermined unit and subtracting the sum of the subsequent units from the sum of the preceding units, and dividing the continuous acceleration data into the predetermined units. And calculating the eccentric data by subtracting the minimum acceleration data from the maximum acceleration data for each unit, and dividing the continuous eccentric data into predetermined units and adding the eccentric data of each unit to detect the final eccentric value. It is done.

Hereinafter, a preferred embodiment of the eccentric detection method of the drum washing machine according to the present invention with reference to the accompanying drawings in detail as follows.

2 is a timing diagram showing an eccentric detection process of the drum washing machine according to the present invention, Figure 3 is a timing diagram for explaining the eccentric detection method of the drum washing machine according to the present invention.

Looking at the eccentric detection process of the drum washing machine according to the present invention, as shown in Figure 2, it consists largely of the preliminary detection section and the present detection section and deceleration section.

At this time, the preliminary detection section is composed of acceleration and constant velocity control sections, and the closed loop control is performed, and the detection section is open loop control.

In other words, the preliminary detection section creates a condition in which the eccentricity detection can be accurately performed through the closed loop control, that is, the laundry cloth is distributed evenly, and the detection section performs the actual eccentric detection through the open loop control and then detects the amount of eccentricity. It is to perform dehydration at the rate according to.

The above-described process will be described in detail as follows.

First, the motor is controlled by a closed loop control method to accelerate to a set rotational speed, for example, 108 RPM.

Then, when reaching 108 RPM, the average value of the torque and flux is calculated while performing constant velocity control in a closed loop manner for a first set time, for example, 3 seconds, that is, maintaining 108 RPM for 3 seconds.

At this time, since the constant velocity control is performed in a closed loop method, the laundry cloth spreads well to detect the eccentricity.

The eccentric data is detected and decelerated while the speed control is performed in the open loop manner for a second set time, for example, 4 seconds.

At this time, the eccentric data detection method will be described in detail with reference to FIG.

Prior to the detailed description, the speed of the section is maintained at a constant speed during constant velocity control in the drawing of FIG. 2, but actually flows as shown in FIG. 3.

First, in a speed change state as shown in FIG. 3, for example, the velocity data V _k is measured at every electric angle 720 ° (machine angle 30 °).

For example, the acceleration data a _k is calculated by subtracting the previous six speed data from the sum of six speed data.

Then, for example, when the washing tank rotates once, that is, the machine angle becomes 360 ° and the acceleration data a _k is 12, the eccentric data is calculated by subtracting the minimum value from the maximum value among the acceleration data.

For example, the sum of three eccentric data is calculated and detected as the final eccentric value.

Y = 0.206X + 9

Where Y is the eccentric data and X is the final eccentric value

The final eccentric value detected as described above has a correlation with the eccentric data as in Equation 1, and P = 0.000, R ＾ 2 = 99.7%.

In the eccentric detection method of the drum washing machine according to the present invention, the eccentric value is detected by spreading the laundry cloth so that the eccentric detection can be accurately performed through the closed loop method and detecting the eccentric value by using the speed change through the open loop method. This has the effect of improving performance.

Claims (3)

In the eccentric detection method of the drum washing machine, Accelerating the motor in a closed loop control method and performing constant velocity control for a first predetermined time when the target speed is reached; Driving the motor in an open-loop manner during a second set time and calculating motor speed data at a predetermined cycle when the first set time has elapsed; Calculating acceleration data by adding the continuous speed data in a predetermined unit and subtracting a sum of subsequent units from a sum of previous units; Calculating the eccentric data by dividing the continuous acceleration data into predetermined units and subtracting the minimum acceleration data from the maximum acceleration data for each unit; And dividing the continuous eccentric data into predetermined units and adding the eccentric data of each unit as a final eccentric value. According to claim 1, Eccentricity detection method of the drum washing machine, characterized in that the predetermined period in the step of calculating the motor speed data electric angle 720 ° (machine angle 30 °). According to claim 1, In the step of calculating the eccentric data, the predetermined unit is an eccentric detection method of the drum washing machine, characterized in that consisting of the acceleration data calculated during one revolution of the washing tank.