KR100308018B1 - method for sensing and release laundry tangle of washing machine - Google Patents

Abstract

The present invention relates to a method of detecting and releasing a trap of a washing machine which can accurately detect and release a tangled state of a laundry. In a washing machine, washing is performed by motor on / off control, Comparing the number of pulses generated by the residual electromotive force with one or more set values to detect blanketing; and if a blanket is detected in the blanket detecting step, performing a blanket release stroke corresponding to the degree of blanketing So that it is possible to improve the accuracy of the detection of trapping and to prevent power waste and increase in total washing time.

Description

A method for detecting and releasing a laundry tangle of washing machine,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a washing machine.

1, the washing machine includes a main body 1, a door 2, an outer tub 3, a washing tub 4, a washing tub 5, An unbalance sensing device 5 for sensing vibration at the initial stage of dehydration caused by unidirectional bias of the laundry, a motor 6, a clutch 7, a motor (not shown) A pulsator 8 for generating wash water by using the rotational force of the motor 6 as shown in FIG. 2, and a motor 7 connected to the motor 6, And a pulse amount sensing unit for generating a pulse proportional to the residual electromotive force generated by the rotation of the motor 6 by the residual torque of the pulsator 8 so that the microcomputer 9 can sense the laundry amount .

The thus configured washing machine forms a rotating water flow by the pulsator 8 and performs the washing by friction between the inner tub 4 and the rotating water by rotating the laundry, so that the laundry is tangled with each other according to the characteristics of the laundry.

When the dehydration is performed without releasing the tangled state of the laundry, the laundry is unidirectionally unidirectional so that the inner tub 4 is moved in its center of rotation to perform an irregular rotational movement, that is, an elliptical motion, Thereby generating vibration and noise.

Accordingly, an unbalance sensing device 5 is provided to sense the vibration of the washing machine due to unidirectional biasing of the laundry, and to take measures such as proper washing, rewinding and washing again.

However, the fundamental cause of unidirectional unevenness of the laundry is the entanglement of the laundry blanks. Therefore, in the conventional manner, the blanketing cycle is performed at a predetermined time interval in the washing cycle as shown in Table 1 to prevent the laundry blanks from being tangled.

Laundry administration Left turn time 1.5 seconds 1.5 seconds Downtime 0.8 seconds 0.8 seconds ... Turn right 1.5 seconds Four-roll stroke Left turn time 0.5 second 0.5 second Downtime 0.4 second 0.4 second ... Turn right 0.5 second

Table 1 shows an example of the washing and loosening stroke pattern when the washing time is set to 10 minutes. Table 1 shows an example of the washing and loosening stroke pattern in the order of washing 4 minutes, loosening 1 minute, washing 4 minutes, loosening 1 minute, The left turn / stop / right turn time may be differently applied depending on various washing conditions such as the type of washing machine and the washing time.

The washing machine according to the prior art has the following problems because it performs a forging process in a predetermined operation pattern for a predetermined time irrespective of whether or not the laundry is tangled.

First, when the entangled state of the laundry is severe, dehydration is performed in a state in which the entangled state of the laundry can not be released, thereby generating vibration and noise.

Second, even when the laundry is not tangled, the total washing time is increased due to the time required for the pulping process by wasting the power by performing the pulping process.

Accordingly, it is an object of the present invention to provide a method for detecting and releasing the entanglement of a washing machine, which can accurately detect and release the entangled state of the laundry.

1 is a block diagram showing the construction of a general washing machine

Fig. 2 is a layout diagram showing the configuration of a surplus amount sensing unit configured in cooperation with the motor of Fig. 1

Figs. 3A and 3B are waveform diagrams showing output waveforms of Fig.

4 is a flowchart showing a method for detecting and releasing the entanglement of a washing machine according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

1: Washing machine main body 2: Door

3: outer tub 4: inner tub

5: Imbalance sensing device 6: pulsator

7: motor 8: clutch

9: Microcomputer

In the washing machine, washing is performed by motor on / off control, and the number of pulses generated by the residual electromotive force due to the inertial rotation when the motor is turned off for a predetermined period of time is compared with one or more set values to detect blunting And performing a de-entanglement step corresponding to the degree of entanglement when the entanglement is detected in the entanglement detection step.

Prior to the description of the present invention, the pulse width detection unit shown in FIG. 2 generates pulses in accordance with the residual electromotive force generated when the motor 6 is off, and accordingly the microcomputer 9 performs the pulse detection operation. The degree of entanglement and entanglement of the laundry also serves as a factor for changing the residual electromotive force.

3A and 3B are graphs showing output waveforms showing changes in pulse generation due to the residual electromotive force in a tangled state and a tangled state in the process of washing the same amount of laundry. When the laundry is dispersed without tangling with each other, The pulsator 8 continues to rotate due to inertia without applying pressure or frictional force to the pulsator 8.

Therefore, as shown in FIG. 3A, the pulsator 8 can not be stopped quickly, so that the residual electromotive force is generated for about 0.83 seconds during the motor off interval during the motor on / off period of one week at the point AB connected to the motor coil L of FIG. The negative output pulse is also generated in proportion to it.

However, when the laundry is tangled with each other, the laundry is stopped by the pressure applied to the pulsator 8 when the motor 6 is off, and the pulsator 8 stops quickly.

Therefore, as shown in FIG. 3B, the duration of the residual electromotive force generation during the motor off interval during one motor on / off cycle is reduced to about 0.72 seconds at the point AB connected to the motor coil L of FIG. 2, do.

Therefore, the present invention seeks to detect the trapping by using the principle of the pulse generation by the residual electromotive force.

Hereinafter, a method for detecting and releasing the entanglement of the washing machine according to the present invention will be described with reference to FIG.

4 is a flow chart for explaining a method for detecting and releasing the entanglement, in which a case where the washing time is set to 10 minutes is exemplified.

First, the microcomputer 9 performs a washing operation in accordance with a washing instruction and a preset algorithm corresponding to the user's washing instruction and preset water level to start a washing cycle. The microcomputer 9 generates washing water by a residual electromotive force, The number of input pulses is counted (S21).

Subsequently, it is determined whether five minutes have elapsed since the start of the washing operation (S22). If five minutes have elapsed, it is determined whether the counted number of pulses is greater than the first set value (S23).

At this time, the pulse counting time set for 5 minutes corresponds to the total washing time of 10 minutes, and is variable depending on the entire washing time.

If it is determined in step S23 that the number of pulses is greater than the first set value, it is determined that the laundry is severely tangled with each other, and the laundry is stopped and a forging process is performed in the first pattern (S24).

At this time, as shown in Table 1, the forging process is a process of repeating the motor left turn / pause / motor right turn for the set time, and the first pattern is a forging pattern which is set to be suitable for dispersing the severely entangled laundry 1, the downtime is shortened and the total for-stroke execution time is lengthened as compared with Table 1, so that a strong unwinding operation is performed.

If it is determined in step S23 that the number of pulses is not greater than the first set value, it is determined whether the number of pulses is equal to or less than the first set value and equal to or greater than the second set value in step S25.

In this case, the first and second set values are reference values for comparing and judging the degree of entanglement of the laundry. The first and second set values are calculated based on the characteristics of the washing machine (capacity of the washing machine, motor starting torque, etc.) The first set value is a reference value for comparing and judging the state where the laundry is severely tangled, and the second set value is a value that the laundry is in contact with the first set value The first set value is larger than the second set value because it is the reference value for comparing and judging the weakly tangled state.

Therefore, when the amount of laundry is detected, the first set value and the second set value corresponding to the laundry amount are selected from the ROM table.

If the number of pulses is equal to or less than the first set value and is equal to or greater than the second set value as a result of the determination (S25), it is determined that the laundry bag is tangled with the first set value and the second set value, The washing is stopped, and a forging process is performed in the second pattern (S26).

In this case, since the second pattern is a pattern of unrolled stroke for releasing the unevenness of the first pattern, the entire process time is shorter and the dwell time is longer than that of the first pattern.

If it is determined in step S25 that the number of pulses is less than the second set value, it is determined that the laundry is not entangled and the stored count value of the number of pulses is reset in step S27.

Then, the microcomputer 9 resumes the washing operation and counts the number of pulses input to the 'P4' terminal by the residual electromotive force once again (S28) in order to determine whether or not the laundry is completely disconnected.

Then, it is determined whether five minutes have elapsed (S29). If five minutes have elapsed, it is determined whether the counted number of pulses is greater than a first set value (S30).

If it is determined in step S30 that the number of pulses is greater than the first set value, it is determined that the laundry is tangled with each other, and the laundry is stopped and a forging process is performed in the first pattern (S31).

If it is determined in step S30 that the number of pulses is not greater than the first set value, it is determined whether the number of pulses is equal to or less than the first set value and equal to or greater than the second set value in step S32.

If it is determined in step S32 that the number of pulses is equal to or less than the first set value but is equal to or greater than the second set value, it is determined that the laundry can not be entangled with each other not significantly compared to the step S31. (S33).

If it is determined in step S32 that the number of pulses is less than the second set value, it is determined that the laundry is not entangled and the current counted number of pulses stored value is initialized in step S34, .

As described above, the description of the method for detecting and releasing the trapping of the present invention up to now is an example in which the washing time is 10 minutes. It can be said that

The method for entangling and releasing the washing machine according to the present invention has the following effects.

First, by using the strength of the residual electromotive force according to the state of the laundry, it is possible to improve the accuracy of the detection of the entanglement by judging the entanglement.

Second, unlike the prior art, when the blanks are detected, the blanketing operation is performed, thereby preventing the waste of electric power and the increase in the total time required for the blanket operation due to the unconditional blanketing operation regardless of the blanks.

Third, by judging the degree of entanglement and performing the appropriate apolipulation operation, the entanglement can be completely released.

Claims (5)

In the washing machine, Detecting blunting by comparing the number of pulses generated by the residual electromotive force due to inertial rotation when the motor is turned off for a predetermined time with one or more set values; And performing a bubble disintegration process so as to correspond to a degree of bubble formation when bubble formation is detected in the bubble formation detection step. The method according to claim 1, Wherein the at least one set value is a value set as a reference variable for the washing machine capacity, the motor starting torque, the laundry quantity, and the laundry tangling degree. The method according to claim 1, Wherein the step of performing the enforcing disengagement step is repeatedly performing the motor left turn / motor off / motor right turn in each operation pattern for a second set time according to the degree of entanglement . The method of claim 3, In the step of repeatedly performing the motor left turn / motor off / motor right turn for each second set time according to the degree of the entangling, the second set time is increased as the degree of entangling becomes greater than a certain level, Off time of the washing machine is reduced. The method according to claim 1, And the number of times of performing the entangling detection step and the disentangling step is increased or decreased in proportion to the entire washing time.