KR19990085002A - Load sensing device of drum washing machine and control method - Google Patents

Abstract

The disclosed drum washing machine relates to a load sensing device of a drum washing machine and a control method thereof so as to more effectively sense a load input into a drum. The present invention, a drum in which laundry is put therein, a motor for rotating the drum through a power transmission means, a rotation system for detecting the pulse number according to the rotation of the motor and the driving of the motor, the rotation system And a control unit for determining an amount of load in the drum based on the number of pulses detected from the motor. The motor driving step of driving a motor to rotate the drum, a pulse detection step of detecting and counting pulses according to the motor driving A load amount determination step of determining the load amount according to the detected number of pulses. Therefore, the cause of error is eliminated, so that the load amount can be detected more accurately, the noise caused by the increase in the number of revolutions is suppressed, and the detection time and the washing time of the load amount are greatly shortened.

Description

Load sensing device of drum washing machine and control method

The present invention relates to a drum washing machine, and more particularly, to a load washing apparatus and a control method of the drum washing machine to more effectively detect the load amount put into the drum.

In general, a washing machine is a device for washing clothes by using the power of a machine. The washing machine is mainly driven by an electric motor. Also, a washing machine, washing and rinsing, and dehydration process are carried out to remove the dirt on clothes by using detergent and water. do. In particular, the drum washing machine puts water, detergent and laundry inside the drum in which several protrusions are formed and rotates at a low speed on the horizontal axis so that the laundry is lifted up by the protrusions. It has the feature of using less water.

1 is a block diagram schematically showing a load sensing device of a conventional drum washing machine. According to this, the drum 1 into which laundry is put, and the motor 3 which generate | occur | produce power are provided in the inside. In addition, a power transmission means (2) is provided to transmit the power of the motor (3) to the drum (1). Preferably, the power shear means (2) is formed on each side of the motor (3) and the drum (1) each pulley (2a) (2c) is fastened to each other by a belt (2b). In addition, a control unit 4 for adjusting the driving state of the motor 3 is provided, and a rotation state detection unit 5 for detecting the rotation or stop state of the drum 1 and applying it to the control unit 4 is provided. do.

2 is a flowchart illustrating a load sensing method of a conventional drum washing machine, and FIG. 3 is a view showing a drum stop time according to a load of a conventional drum washing machine.

The operation of the load sensing device and method of the conventional drum washing machine configured as described above will be described in detail.

The washing operation of the conventional drum washing machine is performed in the order of a series of washing process, rinsing process and dehydration process. In addition, this washing operation is performed by different programs predetermined according to the load amount put into the drum 1. Therefore, it is a very important factor to accurately sense the load inside the drum 1 before performing the washing process.

In the conventional load sensing method, as shown in FIG. 3, the controller 4 first drives the motor 3 to raise the rotation state of the motor 3 to a predetermined rotation speed W1. Here, the rotational force of this motor 3 rotates the drum 1 via the power transmission means 2 which consists of pulleys 2a and 2c and the belt 2b (S101-S102).

Thereafter, when the power of the motor 3 is cut off, the drum 1 is slowly rotated for a predetermined time due to inertia (S103).

In addition, the rotation state detecting unit 5 detects the state where the drum 1 is stopped and immediately applies it to the control unit 4. Therefore, the controller 4 counts the time at which the rotation of the drum 1 is completely stopped from the time when the power of the motor 3 is stopped (S104 to S105), and counts the counted time as a predetermined reference time. Compared with (t1, t2, t3), respectively, the internal load is determined.

That is, the more the load inside, the longer the stop time of the drum, and the less the load, the shorter the stop time of the drum. For example, as shown in FIG. 3, when the count time is t1 or less, it is determined as "load amount small (A)" (S106 to S107), and when the count time is t2 (t1 <t2 <t3), "in load amount". (B) "(S108 to S109), and if the count time is t3 or more, it is determined to be" load amount C "(S110 to S111).

Thereafter, the controller 4 drives an appropriate program according to the detected load, and performs washing, rinsing, and dehydration processes.

However, the load sensing device and method of the conventional drum washing machine operated as described above have an error e1 between the stop times t1, t2 and t3 according to the respective loads of the drum due to the frictional resistance between the laundry inside the drum and the door. , e2, e3) are generated, and the error due to the frictional resistance is different depending on the load. In other words, the greater the load, the greater the frictional resistance and the greater the error of the stop time. (See the reference signs C and e3 shown in FIG. 3). Therefore, there is a problem in that it is not possible to detect the exact load due to such an irregular error.

In addition, by increasing the motor to a predetermined number of revolutions (W1) to detect the load amount, the noise is increased accordingly, and there is another problem that the detection time of the load amount is long.

The present invention has been made to solve the above problems, and an object thereof is to provide a load washing device for a drum washing machine that can accurately detect the load amount put into the drum.

Another object of the present invention is to provide a load sensing control method for a drum washing machine, which can more effectively sense the amount of load put into the drum through the load sensing device of the drum washing machine according to the present invention.

1 is a block diagram schematically showing a load sensing device of a conventional drum washing machine;

2 is a flowchart illustrating a load sensing method of a conventional drum washing machine.

3 is a view showing a drum stop time according to the load of the conventional drum washing machine,

Figure 4 is a block diagram showing a preferred embodiment of the load sensing device of the drum washing machine according to the present invention,

5 is a flowchart showing a preferred embodiment of a load sensing control method of a drum washing machine according to the present invention.

Explanation of symbols on the main parts of the drawings

10 drum 20 power transmission means

30: motor 40: control unit

50: tachometer

Features of the load sensing device of the drum washing machine according to the present invention for achieving the above object, in the drum washing machine, a drum in which laundry is put therein, a motor for rotating the drum through a power transmission means, and It includes a rotation system for detecting the number of pulses according to the rotation of the motor and controlling the driving of the motor, and determines the amount of load in the drum through the number of pulses detected from the rotation system.

Preferably, the tachometer is a digital tachometer that generates and counts pulses according to rotation.

The load sensing control method of the drum washing machine according to the present invention is characterized in that, in the drum washing machine control method, a motor driving step of driving a motor to rotate the drum, and pulse detection for detecting and counting pulses according to the motor driving And determining a load amount according to the detected number of pulses.

Therefore, the cause of error is eliminated, so that the load amount can be detected more accurately, the noise caused by the increase in the number of revolutions is suppressed, and the detection time and the washing time of the load amount are greatly shortened.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the load sensing device and method of the drum washing machine according to the present invention will be described in detail.

Figure 4 is a block diagram showing a preferred embodiment of the load sensing device of the drum washing machine according to the present invention.

According to this, a preferred embodiment according to the present invention includes a drum 10, a power transmission means 20, a motor 30, a control unit 40, and a tachometer (50). Laundry is introduced into the drum 10, and the motor 30 generates power. In addition, the power transmission means 20 transmits the power of the motor 30 to the drum 10 to rotate the drum (10). Here, a common pulley is formed on one side of the motor 30 and one side of the drum 10, and the pulleys are fastened to each other by a belt.

In addition, the tachometer 50 detects the number of pulses according to the rotation of the motor 30. To this end, it is preferable that the rotation system 50 is a digital rotation system that generates and counts a pulse according to rotation. In addition, the controller 40 may determine the load amount in the drum 10 based on the number of pulses detected by the tachometer 50.

Figure 5 is a flow chart showing a preferred embodiment of the load sensing control method of the drum washing machine according to the present invention, when described in more detail the operation of the preferred embodiment of the present invention configured as follows.

According to this, first, the controller 40 drives the motor 30 to generate a rotational force, which is transmitted to the drum 10 through a power transmission means 20 composed of a conventional belt and pulley, thereby providing the drum 10. ) Is rotated (S201).

On the other hand, the rotation system 50 generates and counts pulses according to the rotation of the motor 30, and the number of pulses of the motor 30 thus counted is applied to the controller 40 (S202).

Therefore, the controller 40 compares each reference pulse number F1, F2, F3 preset according to the load amount with the pulse number detected by the tachometer 50 to determine the load amount.

That is, since the number of pulses is proportional to the inertia and thus the rotational speed, when the detected number of pulses is less than or equal to F1, it is determined that the load is small (S203 to S204), and when the number of pulses is F2 (F1 <F2 <F3). It is determined as "in load amount" (S205 to S206), and when the number of pulses is F3 or more, it is determined as "load amount band" (S207 to S208).

Such load determination can be immediately detected when the motor 30 is driven. That is, the drum 30 is rotated by raising the motor 30 at a predetermined rotation speed as in the related art, and the motor 30 is driven together without driving the predetermined time until the drum 10 is stopped. When the number of pulses is detected, the lower the number of pulses is detected, the higher the number of pulses, the higher the number of pulses is detected, and thus the load amount can be immediately determined.

In addition, the controller 40 performs appropriate washing, rinsing, and dehydration processes according to the detected load amount as described above, and after detecting the load amount, immediately performs the washing process without stopping the drum 10, thereby detecting the load amount. In addition to the shortening of time, it is possible to further shorten the total washing time.

As described above, according to the load sensing device and control method of the drum washing machine according to the present invention, the error of the resistance is eliminated, so that the load can be detected more accurately, and the noise caused by the increase in the number of revolutions is suppressed. There are various effects of greatly reducing the load detection time and washing time.

Although the above has been illustrated and described with respect to the preferred embodiments of the present invention, the present invention is not limited to the above-described embodiments, and the general knowledge in the field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Anyone with a variety of modifications can be made, as well as such modifications are within the scope of the claims.

Claims (3)

In the drum washing machine, A drum into which laundry is put; A motor for rotating the drum through a power transmission means; A tachometer for detecting the number of pulses according to the rotation of the motor; And And a control unit for controlling the driving of the motor and determining the amount of load inside the drum based on the number of pulses detected from the tachometer. According to claim 1, The rotation system, A load washing device for a drum washing machine, characterized in that it is a digital tachometer which generates and counts a pulse according to rotation. In the control method of the drum washing machine, A motor driving step of driving the motor to rotate the drum; A pulse detecting step of detecting and counting a pulse according to the motor driving; And And a load amount determining step of determining a load amount according to the detected number of pulses.