KR19990055477A - How to detect belt slip in drum washing machine - Google Patents

Abstract

A belt slip detection method of a drum washing machine which detects a belt slip occurrence and detects a decrease in washing performance and noise generation. The belt slip detection method of a drum washing machine having a drum provided with a rotational force of a motor by the belt And driving the motor at a set speed, measuring the rotation speed change amount of the drum for a predetermined time, comparing the rotation speed change amount with the reference value, and detecting the belt slip according to the comparison result. Efficiency and reliability can be improved.

Description

Belt slip detection method of drum washing machine

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

Generally, a washing machine is a machine for washing laundry by performing washing, rinsing, and dehydrating strokes according to a predetermined algorithm. The washing machine is classified into a pulsator type, a stirring type, a drum type, and the like according to a washing method.

At this time, as shown in FIG. 1, the drum washing machine includes a main body 1, a tub 2 fixed by a damper (not shown) inside the main body 1, and laundry into the tub 2 and a motor ( The driving force of 10) is transmitted through the belt 11 to rotate the drum 3 for washing-related stroke, the thermistor 4 for measuring the temperature of the washing water supplied to the drum 3, and to input detergent. Detergent container (5), connected to the detergent container (5), the water supply pipe (6) for supplying the wash water or the detergent container (5) mixed with the detergent, the drain pipe for discharging the washing water used in the washing stroke to the outside (7) ) Is connected to the end of the drain pipe (7) and comprises a pump (8) and a drain hose (9) for forcibly pumping the washing water.

And when looking at the operation of the drum washing machine configured as described above, first, when the user opens the door (not shown) attached to the front of the main body 1, puts the laundry, and inputs the washing command through the control panel, the washing water is the detergent container (5). Guided by the water supply pipe (6) through the) is filled in the drum (7). Subsequently, when the washing water is filled above a certain level, the motor 10 is driven and the drum 3 rotates to perform washing.

At this time, if the user selects a boiled laundry, washing is performed using high temperature wash water.

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 dehydrating stroke are continuously performed, and the washing administration is finished. do.

In this case, the drum washing machine uses a belt 11 between an inner tub pulley (not shown) and a motor pulley (not shown) for power transmission for rotating the drum 3. Compared to the washing machine, a lot of load is applied to the rotation of the drum 3 and the belt 11 is also affected.

In addition, since the belt 11 has elasticity, when it is used for a long time in a washing machine that performs left / right stirring, the belt 11 may be relaxed and not returned to its original state, resulting in belt slip.

When belt slip occurs in the drum washing machine according to the prior art, the following problems occur.

First, since belt slip occurs, the rotational force of the motor cannot be completely transmitted to the drum, so the left / right stirring operation is not accurately controlled and the rotational force is also lowered, resulting in deterioration of washing performance.

Second, since the belt is not completely in contact with the outer circumferential surfaces of the motor pulley and inner tub pulley, noise occurs when the motor is driven.

Accordingly, an object of the present invention is to provide a belt slip detection method of a drum washing machine that can detect a belt slip occurrence to detect a decrease in washing performance and noise generation by devising to solve the above problems.

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

2 is a flowchart illustrating a belt slip detection method of a drum washing machine according to the present invention.

3 is a graph showing the change in the motor rotational speed according to the belt state of the drum washing machine

<Description of the symbols for the main parts of the drawings>

1: body 2: tub

3: drum 4: thermistor

5: detergent container 6: water pipe

7: drain pipe 8: pump

9: drain hose 10: motor

11: belt

The present invention provides a belt slip detection method of a drum washing machine having a drum provided with a rotational force of a motor by a belt, the method comprising: driving a motor at a set speed, measuring a change in rotational speed of the drum for a predetermined time, and rotating And comparing the speed change amount with the reference value and detecting the belt slip according to the comparison result.

Hereinafter, a belt slip detection method of a drum washing machine according to the present invention will be described with reference to the accompanying drawings.

Figure 2 is a flow chart showing a belt slip detection method of the drum washing machine according to the present invention, Figure 3 is a graph showing a change in the motor rotation speed according to the belt state of the drum washing machine.

In the belt slip detection method of the drum washing machine according to the present invention, first, the user applies power to the drum washing machine, opens the door of the drum washing machine, inputs laundry, and then inputs a washing instruction through the control panel.

Subsequently, the controller (not shown) accelerates the motor 10 to the set RPM Rs before proceeding to the washing process (S11), and measures the change amount of the RPM V _m for a predetermined time t ₀ (S12). ).

In this case, the method of measuring the change amount of RPM (V _m ) is to measure the RPM (x) a certain time for the predetermined time (t ₀ ) and calculate the respective measured value (R _n ) using the equation (1).

[Equation 1]

That is, the difference between the RPM of the predetermined time (x) and the set RPM (R _s ) measured during the interval T ₀ is calculated and converted into an absolute value, and then the absolute value is added to the amount of change in RPM.

Subsequently, it is determined whether the RPM change amount V _m measured in the step S12 is _equal to or greater than a predetermined reference value V _ref (S13).

In this case, as shown in the graph of FIG. 3A, when the belt 11 is in a normal state, the RPM of the drum 3 is accelerated to the set RPM Rs and then maintains the set RPM Rs without significant change.

However, as shown in the graph of FIG. 3B, when the belt 11 is relaxed and the belt slip occurs, the RPM change is severe from the initial acceleration, and the RPM R _n is changed greatly during the predetermined time t ₀ .

Therefore, when the determination result (S13), the change amount of RPM (V _m ) is more than the reference value (V _ref ) to detect the belt slip (S14), stop the motor drive and then generate an error message, that is, the belt slip through the buzzer or display unit (S15).

On the other hand, the determination result (S13), if the change amount (V _m ) of the RPM is less than the reference value (V _ref ) is determined that the belt 11 is normal (S16), and proceeds the washing according to the user's washing instruction and a predetermined algorithm (S17).

Belt slip detection method of the drum washing machine according to the present invention detects the belt slip according to the change in the rotational speed of the drum and informs the user to take measures such as adjusting or replacing the tension of the belt laundry noise caused by the belt slip And by preventing the washing performance decreases there is an effect that can improve the washing efficiency and reliability of the washing machine.

Claims (6)

In the belt slip detection method of the drum washing machine having a drum provided with the rotational force of the motor by the belt, Driving the motor at a set speed; Measuring an amount of change in the rotational speed of the drum for a predetermined time; And detecting the belt slip according to the result of the comparison by comparing the rotation speed change amount with a reference value. The method of claim 1, Measuring the amount of change in the rotational speed of the drum during the predetermined time Measuring the rotational speed of the drum for a predetermined time; And calculating the difference between the respective drum rotational speeds and the reference rotational speeds and summing the values. The method of claim 2, The predetermined time is a belt slip detection method of the drum washing machine, characterized in that set in proportion to the time for setting the reference rotation speed. The method of claim 2, The schedule is a belt slip detection method of the drum washing machine, characterized in that the variable according to the sensitivity of the belt slip detection. The method of claim 1, Detecting the belt slip according to the comparison result Belt slip detection method of the drum washing machine, characterized in that for detecting the belt slip when the rotation speed change amount is more than the reference value. The method of claim 1, Stopping the driving of the motor when the belt slip is detected in the step of detecting the belt slip according to the comparison result; Belt slip detection method of the drum washing machine characterized in that it further comprises the step of outputting an error message.