KR19990051546A - Dehydration termination control method of washing machine - Google Patents

Abstract

The present invention relates to a dehydration termination control method of the washing machine to terminate the dehydration while preventing the vibration or noise of the washing tub rotating inertia upon completion of dehydration in a series of washing administration,

The present invention is a dehydration step (30) to proceed with dehydration after every stroke in a series of washing administration, and the dehydration end judging step (31) to determine whether the dehydration end time during the dehydration in the dehydration step (30) ), And when the dehydration termination time step 31 is 1 minute before the end of the dehydration time, the washing motor power off step 32 of turning off the power to stop the washing motor, and the washing motor power off step 32 The frequency calculation step 33 of detecting the rotation speed of the washing motor which is terminated in the state where the power of the motor is turned off and calculating the frequency with respect to the detected rotation speed, and the frequency calculated in the frequency calculation step 33 is a suspension value. A frequency judging step 34 for determining whether the vibration vibration natural frequency (0-3 HZ) of the device is in the range, and if the frequency calculated in the frequency judgment step 34 is not within the vibration natural frequency of the suspension device, Detected by the rotational speed and, on the other hand it is characterized by dewatering made of an end stage 35, which operates the brake exit the dehydration is within the range of the natural frequency of the vibration frequency of the computed suspension.

Description

Dehydration end control method of washing machine

The present invention relates to a dehydration end control method of the washing machine, and more particularly, to a dehydration end control method of the washing machine to terminate the dehydration while preventing vibration or noise of the washing tub rotating inertia upon completion of dehydration in a series of washing administration. .

In general, the washing machine is dehydrated in order to remove the detergent liquid or contaminated washing water penetrated into the laundry at the end of each of the series of washing operations in the washing machine.

However, when the dehydration administration proceeds to drain the detergent liquid or the contaminated washing water and when the dehydration is finished, the washing motor is turned off and the dehydration shaft is forcibly stopped by the brake mounted on the gear unit. Is not stopped but is gradually stopped by rotating inertia by the weight of the laundry in the washing tank.

In stopping the dehydration as described above, when the dehydration shaft is braked after the end of the dehydration, the rotation speed of the dehydration shaft during high-speed rotation is rapidly reduced by braking. The washing tank causes vertical vibration because it is out of the range of vibration natural frequency (0-3 HZ), and this vertical vibration causes a lot of vibration and noise when the dehydration ends by hitting the reservoir on the outer side of the washing machine. In the case of forced braking of the brake, damage to the brake may be caused by the static frictional force, thereby shortening the life of the brake when used for a long time.

An object of the present invention is to calculate the frequency according to the number of revolutions of the motor that is terminated after turning off the power of the motor at the end of dehydration when dehydration of a series of washing administrations, the calculated frequency reaches within the vibration natural frequency of the suspension When the brake is operated, the vibration noise caused by the braking impact during the brake operation is maximally prevented to terminate the dehydration.

In order to achieve the above object, the present invention comprises the steps of proceeding dehydration after every stroke in a series of washing administration, and in the step of determining the dehydration end time 1 minute before the dehydration in the step, and dehydration in the step 1 minute before the end time, turn off the power to terminate the dehydration, and detect the rotational speed of the washing motor to be terminated to calculate a frequency for the detected rotational speed, wherein the frequency calculated in this step is unique to the vibration of the suspension Determining whether the frequency is within the range of the frequency, and if the frequency calculated in the step is not within the range of the vibration natural frequency of the suspension device, the number of revolutions is continuously detected, while the calculated frequency is equal to the vibration natural frequency of the suspension device. If it is in the range it is characterized in that the step of stopping the dehydration by operating the brake.

1 is a schematic longitudinal sectional view of a washing machine used in the present invention;

2 is a schematic control block diagram of a washing machine used in the present invention.

Figure 3 is a flow chart for the dehydration end control method of the washing machine of the present invention

Explanation of symbols for main parts of the drawings

end; Operation signal input unit b; Micom

All; Drainage and driving part d; Water level detector

hemp; Motor drive bar; Speed sensing part

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic longitudinal sectional view of a washing machine used in the present invention, a reservoir (1) for storing the washing water supplied in a series of washing administrations, and washing, rinsing, and dehydrating laundry inside the reservoir (1). Washing tank 2, a pulsator (3) for washing and rinsing laundry while rotating forward and reverse in the inner center of the washing tank (2), and the pulsator (3) and washing tank in the lower center of the water storage tank (1) Gear portion 4 for rotating (2), a motor (5) for supplying rotational force to the gear portion 4 to the lower side of the reservoir (1), and the water level to be supplied and drained to the reservoir (1) The water level sensor 6 for detecting the rotational speed sensor 7 for detecting the rotational speed of the motor (5).

Figure 2 is a schematic control block diagram of a washing machine used in the present invention, the operation signal input unit (a) for setting and inputting a series of washing operation, washing, rinsing, dehydration operation and input from the operation signal input unit (a) To control the driving signal by a predetermined program and output the controlled signal to each drive unit to control each drive unit, and to receive and control the microcomb control signal to feed and drain the washing tank. Water supply and drainage drive (C), the water level detection unit (D) for detecting the water level of the wash water supplied to the washing tank and drained by the control signal of the microcomputer (b), and the control signal of the microcomputer (b) The motor driving unit (e) for washing and rinsing while rotating forward and reverse by rotating the motor at high speed, and the rotation speed sensing unit (ba) for detecting the rotational speed of the motor driven by dehydration by the control signal of the microcomputer (b). It was made up of.

Figure 3 is a flow chart for the dehydration end control method of the washing machine of the present invention, dehydration step 30 to proceed with dehydration after every stroke in a series of washing administration, and dehydration during the dehydration in the dehydration step (30) Dehydration end determination step 31 to determine whether the end time 1 minutes before, and if the dehydration end time 1 minute before the end of the dehydration termination step 31, washing motor power off step 32 to turn off the power to stop the washing motor And a frequency calculation step 33 of detecting the rotation speed of the washing motor which is terminated in the state in which the washing motor is turned off in the washing motor power-off step 32, and calculating a frequency with respect to the detected rotation speed. A frequency judging step 34 for judging whether the frequency calculated in the frequency calculating step 33 is within the range of vibration natural frequency (0-3 HZ) of the suspension device, and the frequency calculated in the frequency judging step 34 If the vibration is not in the range of the natural oscillation frequency of the suspension continues to detect the number of revolutions, while if the calculated frequency is in the range of the vibration natural frequency of the suspension, dehydration termination step of terminating the dehydration by operating the brake (35 It is to be made of).

Referring to the operation of the present invention made as described above are as follows.

First, the power is supplied to the washing machine, and the laundry signal to be washed is put in the washing tank 2, and the driving signal input unit sets a series of washing administrations to be operated through the microcomputer (B). B) In the operation signal input from the operation signal input unit (A) by a predetermined program, the water supply and drainage drive unit (C) is first controlled by the predetermined program to supply water to the washing tank (2). At this time, the water supply level is controlled by the water level sensor (D) to detect water through the water level detector (6), and when the water supply is completed, the microcomputer (B) controls the motor driving unit (E) to control the motor (5). ) Is rotated forward and backward, and washing is performed while the pulsator 3 is rotated forward and backward through the gear unit 4 at a predetermined rotation speed.

As described above, it is determined whether the washing is completed while the washing motor is rotated forward and backward. If the washing is completed, the contaminated washing water generated during washing is drained, and the dehydration is performed. Subsequently, the water supply and drainage drive unit (C) is controlled to supply water to the determined water level, and the motor driving unit (E) is controlled to rinse a predetermined number of times (twice) while rotating the pulsator 3 forward and backward. .

On the other hand, if the rinsing operation is completed during the rinsing, in order to remove the detergent liquid and contaminated wash water that has soaked in the laundry during rinsing, go to the dehydration step 30 to control the motor driving part (e) to control the motor (5). Rotate the washing tank 2 while rotating in one direction at high speed until the set dehydration time is completed. In the microcomputer (b), go to the dehydration end determination step 31. The set dehydration time reaches 1 minute before the end of dehydration. If the dehydration time does not reach 1 minute before the end of dehydration, the microcomputer (b) continues dehydration, while the dehydration time is 1 minute after the dehydration end time. When it is reached, the microcomputer (b) goes to the washing motor power off step 32 to terminate the dehydration and controls the motor driving part e to turn off the power to the motor 5. Then, the microcomputer (b) goes to the frequency calculation step 33 and controls the rotation speed sensing unit (bar) to sense the rotation speed of the motor 5 which is turned off and dehydrated by the rotation speed sensing unit 7. In order to know the vibration according to the detected rotation speed, it is calculated as the frequency (f = 1 / T).

When the frequency according to the rotational speed of the motor is terminated as described above, the microcomputer (b) goes to the frequency determination step 34 and the frequency f according to the rotational speed of the ending motor is the vibration intrinsic frequency of the suspension device. (f1) (0-3HZ) is determined, and if the frequency (f) is not within the vibration intrinsic frequency (f1) of the suspension device, go to the frequency calculation step 33 and detect the rotation speed In the frequency determination step 34, if the frequency f is within the vibration intrinsic frequency f1 of the suspension device, the motor 5 currently rotating in the microcomputer vibrates. It is determined that the rotational speed that does not cause the end to go to the dehydration end step 35 is to operate the brake mounted on the motor 5 of the motor driving part (bar) to end the dehydration.

As described above, the present invention calculates a frequency according to the number of revolutions of a rotating motor by inertia after turning off the power of the motor at the time of dehydration when dehydration is completed during a series of washing operations. When the calculated frequency is within the vibration natural frequency of the suspension device, the brake is operated to terminate the dehydration, thereby preventing the vibration noise caused by the braking of the brake at the end of the dehydration. It will provide an effect that can terminate the dehydration.

Claims (1)

Dehydration step (30) and the dehydration end judging step (31) to determine whether the dehydration end time 1 minute before the dehydration in progress during the dehydration step 30, and the dehydration step 30 in the dehydration step 30, 1 minute before the end of the dehydration end time in the dehydration end determination step 31, the washing motor power off step 32 of turning off the power to stop the washing motor, and the washing motor power off step 32 of the washing motor power off step 32 The frequency calculation step 33 for detecting the rotation speed of the washing motor which is terminated in the off state and calculating the frequency for the detected rotation speed, and the frequency calculated in the frequency calculation step 33 is the vibration of the suspension device The frequency judging step 34 for determining whether it is in the range of the natural frequency (0-3 HZ), and if the frequency calculated in the frequency judging step 34 is not in the range of the vibration natural frequency of the suspension device, it continues to rotate Dehydration termination control method of the washing machine, characterized in that the dehydration end step (35) to detect the number, and if the calculated frequency is within the range of the vibration natural frequency of the suspension device to operate the brake to terminate the dehydration.