KR100282343B1 - Foam detection method of drum washing machine - Google Patents

Abstract

It relates to a foam washing method of the drum washing machine to improve the accuracy of the foam detection, the step of draining up to the air level and the motor deceleration up to a predetermined rpm / motor deceleration up to a predetermined rpm to perform a preliminary dehydration, and In the dehydration step, acceleration and deceleration are calculated for each motor acceleration / deceleration step, and the first bubble detection step for detecting bubble generation according to the difference and the first reference value, and the bubble in the first bubble detection step If no occurrence is detected, accelerate the motor to dehydration rpm to perform the main dehydration, measure the acceleration time required to increase the rpm of the motor by a predetermined value, compare the acceleration time with the second reference value, and generate bubbles according to the comparison result. Including the second bubble detection step to detect the maximum foaming performance is maximized, washing performance decreases due to foam detection error and prevents waste of power By user can improve the reliability.

Description

Foam detection method of drum washing machine

The present invention relates to a washing machine, and more particularly, to a foam detecting 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, the drum washing machine has been widely used, with the advantage of lowering the damage rate of laundry and the lowest use quantity, compared to other types of washing machines. As shown in FIG. 1, a damper (not shown) inside the main body 1 and the main body 1 is shown. Tub (2) fixed by the (2), laundry is put into the tub (2), the driving force of the motor (9) is transmitted through the belt (10) and rotates to rotate the laundry (3), washing detergent administration is put into the detergent Detergent container (4) for connecting, the water supply pipe (5) for supplying the wash water or the washing water mixed with the detergent of the detergent container (4) is connected to the detergent container (4), drain pipe for discharging the washing water used in the washing administration to the outside (6), connected to the end of the drain pipe (6) is configured to include a pump (7) and a drain hose (8) for forcibly pumping the washing water.

And when 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, put the laundry, and then input the washing command through the control panel, the washing water in the detergent container (4 It is filled in the drum (3) by the guide of the water supply pipe (5) through.

Subsequently, the water level sensor (not shown) detects that the washing water is filled up to a predetermined level corresponding to the laundry which has been introduced and outputs the detected value to the controller. The controller recognizes the completion of water supply according to the detected value and drives the motor 9 to rotate the drum 3 to proceed with washing.

On the other hand, when the washing is completed, the pump 7 is operated so that the washing water is drained to the outside via the drain pipe 6 and the drain hose 8, and when the draining is completed, the rinsing and dehydration stroke is continuously performed to finish the washing administration. do.

In this case, the drum washing machine puts detergent together with the washing water in the laundry administration, and washes by left / right stirring, so many bubbles are generated when dehydration administration is performed by the detergent component remaining in the laundry after draining. Since it acts as a load between the tub (2) to inhibit the driving of the motor (9) it does not reach the normal dehydration rpm.

Therefore, there is a need for an apparatus for accurately detecting the occurrence of a large amount of bubbles to affect the dehydration stroke and performing a proper operation such as bubble removal.

Hereinafter, with reference to the accompanying drawings will be described a foam detecting method of the drum washing machine according to the prior art as follows.

Figure 2 is a flow chart showing a foam detecting method of the drum washing machine according to the prior art, Figure 3 is a graph showing the rpm change with time of FIG.

In the foam washing method of the drum washing machine according to the prior art, as shown in FIG. 2, when entering the dehydration stroke (S11), drainage is performed up to the airborne level (S12).

Subsequently, as shown in FIG. 3, the motor 9 is accelerated to 250 rpm (S13) and the deceleration (S14) is repeated five times (S15) to perform preliminary dehydration.

Then, the motor 9 is accelerated to dewatering rpm (S16), and the time required for the motor 9 to accelerate from 300rpm to 500rpm, that is, the acceleration time ta is measured (S17).

Subsequently, it is determined whether the acceleration time ta is greater than the set time Tr (S18). If the acceleration time ta is greater than the set time Tr, it is determined that there is a bubble and the motor 9 is stopped. (S19), the water supply / motor stirring / drainage is performed sequentially to perform a bubble removing operation (S20).

In this case, as shown in Figure 3, when the foam is generated, the motor 9 acceleration time is longer than when the foam does not occur, so the motor (9) up to 300 ~ 500rpm in a state that does not generate bubbles The time required for accelerating is set as the set time Tr, and the presence / absence of bubbles is determined by comparing with the actual acceleration time ta.

On the other hand, if the determination result (S18), the acceleration time (ta) is less than the set time (Tr) is that there is no bubble, that is, it is determined that the normal dehydration proceeds to the dehydration rpm and dehydration is completed (S21), Quit.

Foam washing method of the drum washing machine according to the prior art performs the foam detection based on the acceleration time of the specific rpm section, the acceleration time is likely to cause errors due to the change of the motor output due to the amount of washing cloth or the power supply voltage. Therefore, there is a problem that the washing performance is reduced or the power is wasted due to the bubble detection error due to the lack of accurate foam detection.

Accordingly, an object of the present invention is to provide a foam washing method for a drum washing machine, which is designed to solve the above-described problems and to improve the accuracy of foam sensing.

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

Figure 2 is a flow chart showing a bubble detection method of the drum washing machine according to the prior art Figure 3 is a graph showing the rpm change with time of FIG.

Figure 4 is a flow chart illustrating a foam detection method of the drum washing machine according to the present invention

5 is a graph showing a change in rpm over time of FIG.

Explanation of symbols for main parts of the drawings

1: body 2: tub

3: drum 4: detergent container

5: water pipe 6: drain pipe

7: pump 8: drain hose

9: motor 10: belt

The present invention is to drain the air to the air level and repeat the motor acceleration / deceleration up to a predetermined rpm a predetermined time to perform a preliminary dehydration, and to calculate the acceleration and deceleration for each motor acceleration / deceleration step in the preliminary dehydration step The difference between the first reference value and the difference between the first bubble detection step and the bubble detection is detected in accordance with the comparison result, if the bubble generation is not detected in the first bubble detection step to accelerate the dehydration rpm to perform dehydration And a second bubble detection step of measuring an acceleration time required to increase the rpm of the motor by a predetermined value, comparing the acceleration time with the second reference value, and detecting bubble generation according to the comparison result.

Hereinafter, with reference to the accompanying drawings illustrating a preferred embodiment of the foam detecting method of the drum washing machine according to the present invention.

Figure 4 is a flow chart showing a foam detecting method of the drum washing machine according to the present invention, Figure 5 is a graph showing the rpm change with time of FIG.

Foam washing method of the drum washing machine according to the present invention, as shown in Figure 4, when entering the dehydration stroke (S31), performs the drainage to the air level (S32).

Subsequently, as shown in FIG. 5, a primary bubble detection step is performed.

That is, the motor 9 is accelerated to 250 rpm and the absolute value of the acceleration Measure (S33), decelerate to 100rpm and determine the absolute value of the deceleration It is measured (S34).

At this time, since the acceleration and deceleration is the speed change amount / time, the measurement is calculated by the microcomputer received the sensing value of the rotation sensor of the motor (9).

And the difference between the absolute value of deceleration and the absolute value of acceleration Is determined to be greater than the reference value, that is, 50 (S35), and if the difference between the absolute value of deceleration and the absolute value of acceleration is greater than the reference value, it is detected that bubbles have occurred (S36).

In this case, as shown in Figure 5, when the bubble is generated when the acceleration is reduced compared to the state in which no bubble is generated, the deceleration is increased, so whether the bubble is generated by comparing the difference between the absolute value of the acceleration and the absolute value of deceleration compared with the reference value To judge.

Subsequently, the primary bubble detection step (S33 ~ S36) is repeated five times (S37), preliminary dehydration is performed.

At this time, even if bubbles are detected during the first five times the first bubble detection step (S33 ~ S36) to repeat the first five times (S33 ~ S36) to remove the water and bubbles.

When foam is detected in the first bubble detection step (S33 to S36), the motor 9 is stopped (S42), and water supply / motor stirring / drainage is performed sequentially to perform a bubble removing operation (S43). Return to the routine and resume dehydration.

On the other hand, if no bubbles are detected in the first bubble detection step (S33 ~ S36), the second bubble detection step is performed.

That is, by accelerating the motor 9 to the dehydration rpm (S39), the time required for the motor 9 to accelerate from 300rpm to 500rpm, that is, the acceleration time ta is measured (S40).

Subsequently, it is determined whether the acceleration time ta is greater than the set time Tr2 (S41). If the acceleration time ta is greater than the set time Tr2, it is determined that bubbles are detected and the motor 9 is stopped. (S42), the water supply / motor stirring / drainage is performed sequentially to perform a bubble removing operation (S43).

In this case, the same method as in the related art, but in order to improve the accuracy of the bubble detection, it is determined whether the bubble is detected by comparing the set time Tr2 which is longer than the conventional set time Tr with the actual acceleration time ta.

On the other hand, if the determination result (S41), the acceleration time (ta) is less than the set time (Tr2), it is determined that no bubbles are generated, but in order to finally prepare for the generation of bubbles due to excessive load, etc. Perform.

That is, after the motor 9 is accelerated to 500 rpm, the rpm of the motor 9 is measured and stored in the memory of the microcomputer and the stored value is continuously updated to the maximum value (S44).

At the same time, the current measured rpm of the motor 9 is compared with the maximum rpm (S45). If the difference is a set value, that is, 200 rpm or more, it is determined that bubbles have occurred and the motor 9 is stopped (S42). Motor stirring / drainage is performed sequentially to perform a bubble removing operation (S43).

On the other hand, the comparison result (S45), if the difference is less than 200rpm that there is no bubble, that is, it is determined that the normal dehydration proceeds to dehydration rpm dehydration and when the dehydration is completed (S46), it ends.

Foam washing method of the drum washing machine according to the present invention performs the primary foam detection based on the acceleration / deceleration of the motor and can be maximized the accuracy of the foam detection through the subsequent secondary and tertiary foam detection, so that the foam detection error There is an effect that can improve the user's reliability by preventing power waste, washing performance degradation.

Claims (7)

Draining to the airborne level and repeating the motor deceleration up to a predetermined rpm up to a predetermined rpm a predetermined time to perform preliminary dehydration; A first bubble detecting step of calculating acceleration and deceleration for each motor acceleration / deceleration step in the preliminary dehydration step, comparing the difference with the first reference value and detecting bubble generation according to the comparison result; If foaming is not detected in the first bubble detection step, the motor is accelerated to dewatering rpm to perform main dehydration, and the acceleration time required to increase the rpm of the motor by a predetermined value is measured to compare the acceleration time with the second reference value. And a second bubble detection step of detecting the generation of bubbles according to the comparison result. The method of claim 1, Wherein the first bubble detection step is a foam washing method of the drum washing machine, characterized in that for detecting the generation of bubbles if the value of the acceleration subtracted from the deceleration is greater than the first reference value. The method of claim 2, The first reference value foam detection method of a drum washing machine, characterized in that 40rpm / sec to 60rpm / sec. The method of claim 1, When the foam is detected in the first bubble detection step and the second bubble detection step, foaming method of the drum washing machine, characterized in that further comprising the step of stopping the motor and performing a bubble removing stroke. The method of claim 1, If the bubble generation is not detected in the second bubble detection step further comprises a third bubble detection step of comparing the difference between the maximum value of the motor rpm and the current motor rpm with a third reference value and detecting the bubble generation according to the comparison result Foam detection method of the drum washing machine, characterized in that made. The method of claim 5, The third bubble detecting step of the foam washing method of the drum washing machine, characterized in that the foam generation is detected when the value of the current motor rpm is subtracted from the maximum value of the motor rpm is greater than the third reference value. The method of claim 6, The third reference value foam detection method of the drum washing machine, characterized in that 150rpm to 250rpm.