KR19990065538A - How to detect the quantity of drum washing machine - Google Patents

Abstract

A laundry washing method for a drum washing machine for improving the accuracy of the quantity detecting method, the laundry washing method for a drum washing machine comprising the steps of: starting washing and accelerating the motor to a set speed; It is possible to improve the reliability of the washing machine by rotating the motor at the set speed and measuring the amount of change in the motor speed, and detecting the amount of load by comparing the acceleration time and the amount of change in the motor speed with each reference value. have.

Description

How to detect the quantity of drum washing machine

The present invention relates to a washing machine, and more particularly, to a quantity 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), the water supply pipe (6) for supplying the washing water or the washing water mixed with the detergent of the detergent container (5) connected to the detergent container (5), 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 looking at the 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, puts the laundry, and then inputs the washing command through the control panel.

Subsequently, the controller (not shown) detects the amount of laundry introduced into the drum 3, that is, the quantity of laundry, and receives the washing water of the water level corresponding to the detected quantity of water by the water supply pipe 6 through the detergent container 5. (7) We fill in.

When the washing water is filled above a certain level, the motor 10 is driven and the drum 3 rotates to perform washing.

Subsequently, 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 is continuously performed to terminate the washing administration. .

Hereinafter, a description will be given of the capacity detection method of the drum washing machine according to the prior art.

The drum washing machine according to the related art performs a capacity detection operation based on the time required for accelerating the drum 3 to a predetermined speed. If the quantity is large, the acceleration time increases, and if the quantity is relatively small, the acceleration time decreases. Using the principle that is set by the constant acceleration time and the amount of the corresponding dose value is determined as a reference and compared with the acceleration time according to the current amount to determine the quantity.

In addition, when the drum 3 is rotated at the set speed in the initial stage of dehydration, the rotational speed increases or decreases due to the unbalance of the laundry in the drum 3, and the rising or falling width is also changed according to the quantity of the cargo. .

In other words, the smaller the amount of change, the larger the change of rotation speed, and the larger the amount of change, the smaller the change of rotation speed. In case of the same unbalance amount, the larger the change of rotation speed, the smaller the amount of change and the smaller the change of rotation speed, it is determined that the amount of change is large.

In the initial stage of dehydration, it detects the occurrence of unbalance according to the change of motor speed.

In other words, by measuring the current motor speed change and comparing it with the standard motor speed change, if the current motor speed change is less than the standard motor speed change, it is judged that the unbalance generation amount does not interfere with the dewatering operation. Perform dehydration.

In the conventional laundry washing machine according to the prior art, the detection amount of the laundry is detected according to the acceleration time, and thus there is a problem in that the detection amount of the laundry occurs when the moisture content or supply voltage of the laundry cloth changes.

Accordingly, an object of the present invention is to provide a laundry washing method for a drum washing machine, which can improve the accuracy of the sensing of the laundry by preventing the occurrence of a quantity sensing error.

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

Figure 2 is a flow chart illustrating a detection method of the drum washing machine according to the present invention

Explanation of symbols for 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 includes the steps of starting the washing to accelerate the motor to the set speed and measuring the time required for acceleration, and measuring the amount of change in the motor speed by rotating the motor at the set speed, the acceleration time and the amount of change in the motor speed It is characterized in that it comprises a step of detecting the quantity compared to each reference value.

Hereinafter, with reference to the accompanying drawings, look at the amount of detection of the drum washing machine according to the present invention.

Figure 2 is a flow chart illustrating a detection method of the drum washing machine according to the present invention.

First, the drum washing machine according to the present invention applies the motor rotation speed change amount Δrpm in addition to the acceleration time t as a determining element for carrying out the capacity detection in order to improve the accuracy of the capacity detection.

Subsequently, in the drum washing machine according to the present invention, as shown in FIG. 2, the washing machine starts washing according to a washing instruction of the user (S21) and accelerates the motor 10 to a set speed (S22).

Then, the time t required for the acceleration is measured (S23).

Subsequently, by rotating the motor at the set speed (S24), the change amount of the motor rotational speed (Δrpm _n ) according to the laundry state inside the drum 3 is measured (S25).

Then, the amount of detection is detected based on the acceleration time (t) and the motor rotation speed change amount (Δrpm _n ) (S26).

At this time, the detailed operation of detecting the quantity is as follows.

At this time, before performing the quantity detection operation, in order to subdivide the amount of change in the motor rotation speed, reference values such as a high amount of change in motor rotation speed (Δrpm _H ) and a very high amount of change in motor rotation speed (Δrpm _HH ) are set.

Then, the magnitude of the currently measured motor speed change amount Δrpm _n is determined by comparing the currently measured motor speed change amount Δrpm _n with the Δrpm _H and Δrpm _HH .

Subsequently, when the determination result is Δrpm _n is very high and the measured acceleration time is short, it is detected that the acceleration amount is small because the acceleration time is proportional to the quantity and Δrpm _n is inversely proportional to the quantity.

On the other hand, if Δrpm _n is very high and the measured acceleration time is long, it is sensed that the amount is small.

In this case, when the amount of acceleration is determined only by the acceleration time, if the acceleration time becomes longer due to voltage fluctuation, it may be mistaken as having a large amount of capacity.

Therefore, even if the acceleration time is long, Δrpm _n is very high, so it is detected as small amount.

On the other hand, if Δrpm _n is low and the measured acceleration time is short, it is sensed as having a large quantity.

In addition, washing is performed by supplying the washing water so as to correspond to the amount detected in step S26 (S27).

The drum washing machine according to the present invention detects the amount of change in the acceleration time and the number of revolutions of the motor, and sets the two factors at the same time to detect the amount of capacity, thereby preventing the quantity detection error and at the same time improve the accuracy of the quantity detection There is an effect that can improve the washing performance and thereby the washing machine reliability.

Claims (3)

In the laundry washing method of the drum washing machine, Starting washing to accelerate the motor to a set speed and measuring time required for acceleration; Calculating a change amount of the motor speed by rotating the motor at the set speed; And a step of detecting a quantity of gas by comparing the acceleration time and the amount of change of the motor speed with each reference value. The method of claim 1, The step of detecting the amount of discharge by comparing the acceleration time and the motor speed change with each reference value If the acceleration time is shorter than the reference value and the amount of change in the motor speed is larger than the reference value, detecting that the amount of the gun is smaller than the reference value; If the acceleration time is shorter than the reference value and the amount of change in the motor speed is smaller than the reference value, detecting that the quantity is larger than the reference value, If the acceleration time is longer than the reference value and the motor speed change is greater than the reference value, the step of detecting that the amount less than the reference value, If the acceleration time is longer than the reference value and the amount of change in the motor speed is less than the reference value, the detection amount of the drum washing machine comprising the step of detecting that the larger than the reference value. The method of claim 1, A method of detecting a washing machine of a drum washing machine, characterized in that the step of detecting the acceleration time and the step of calculating the amount of change in the motor speed are repeated a predetermined time to improve the detection performance.