KR20040059223A - method for detecting load in dehydration mode and method for controlling operation of washing machine by using the same - Google Patents

Abstract

PURPOSE: A dewatering load detecting method of a washing machine and an operation control method thereof are provided to drive the washing machine at set RPM(Revolution Per Minute) if the detected load is in a set load by accurately detecting load in a dewatering process and to improve the stability and reliability of the system by stopping a dewatering tub at once for overload. CONSTITUTION: In a washing machine for successively progressing washing, rinsing, draining and dewatering processes for the constant time after putting the laundry into a washing tub and supplying water, a dewatering load detecting method of a washing machine accelerates a dewatering tub with keeping the torque of a motor constant in the dewatering process and detects overload by measuring the acceleration time that the rotational speed of the dewatering tub reaches the constant speed from the acceleration starting time, and starts to decelerate at one point of the constant speed during the dewatering process and detects the overload by the deceleration time decreased to the predetermined RPM from the deceleration starting time.

Description

Method for detecting load in dehydration mode and method for controlling operation of washing machine by using the same

The present invention relates to a washing machine, and more particularly, to accurately detect a load through measurement of acceleration time and deceleration time in a certain section during dehydration, and thereby to effectively control the dehydration process, thereby securing stability and reliability of the system. It is to be done.

In general, a washing machine is a product that removes various contaminants attached to clothes, bedding, etc. by using the emulsification of the detergent and the friction action of the water flow due to the rotation of the washing blade and the impact of the pulsator on the laundry. By detecting the amount and type of laundry, the washing method is automatically set, and the water level of the washing water is supplied to the appropriate level according to the amount and type of the laundry, and then washing is performed under the control of the microcomputer.

On the other hand, the driving method of the conventional washing machine is to transmit the rotational power of the drive motor to the washing shaft through the power transmission belt and pulley, etc. to rotate the pulsator or to the dehydration shaft to rotate the washing tank combined dehydration tank and By rotating the BLDC motor, there is a method of rotating the washing / dehydration tank for washing and dewatering at different speeds.

In addition, there is also a method of controlling the power transmission path differently while using a BLDC motor to perform washing by rotating the pulsator at low speed during washing, and dehydrating by rotating the pulsator and the dehydrating tank at the same time at the same time.

In addition, a method of performing permeation by spraying the pumped water stream into the washing tank while rotating the washing tank or the washing blade at a high speed during washing is also applied.

1 is a longitudinal sectional view showing an example of a conventional washing machine, and shows a structural example of a washing machine that performs washing and dehydration by speed control of a BLDC motor.

Looking at the configuration briefly, the outer tank (2) supported by the suspension device (7) is installed in the outer case (1), the inside of the outer tank (2), the washing tank combined dehydration tank (3) (hereinafter referred to as "washing tank") Or "dehydration tank" is optionally installed rotatably.

In addition, a pulsator 4 is installed at the center of the bottom of the washing tub 3, and a motor 5 for transmitting a driving force to the washing tub 3 is mounted at a lower side of the outer tub 2.

In addition, a drain hose 11 is connected to the other side of the lower portion of the outer tub 2, and a drain valve 6 is provided on a conduit of the drain hose 11.

On the other hand, the top cover 12 of the upper case 1 is provided with a door 8, the water level sensor 9 is provided at a predetermined position of the top cover 12, the control of the top cover 12 The controller 300 is provided inside the panel.

And, between the water level sensor 9 and the outer tank 2 is connected to the pressure transmission tube 10 for transmitting the air pressure according to the level of the outer tank to the level sensor (9).

At this time, as the water level sensor 9, a water level sensor having a mechanical structure and a water level sensor using a semiconductor are usually applied.

On the other hand, the inside of the upper end of the washing tank (3) is provided with a fluid balancer 20 to reduce the unbalance of the washing tank by the fluid flow inside.

In the conventional washing machine configured as described above, if laundry and detergent are put into the washing tank 3 and the washing start button is selected, washing start and washing are rinsed for a predetermined time after water supply is made according to the control signal of the microcomputer after detecting the quantity. , Drainage and dehydration are automatically performed.

However, in the conventional washing machine, there is a problem that dehydration proceeds in a state in which the load is not accurately detected when dehydration proceeds after completion of drainage.

In other words, after draining after washing and rinsing, when dehydration is in progress, if overloading occurs, the dehydration should be stopped. There were a lot of problems, including the crowd.

The present invention is to solve the above-mentioned problems, the present invention is to measure the acceleration and deceleration time before the constant speed section when entering the dehydration in the washing machine to detect the exact load amount, while the set RPM when the detected load amount is within the set load amount It aims to ensure stability and reliability of the system by driving with Revolution Per Minute and stopping the dehydration tank immediately when overloaded.

1 is a longitudinal sectional view showing an example of a conventional washing machine structure

2 is a graph for explaining the principle of the dehydration load detection method of the present invention

Figure 3 is a graph showing the process of dehydration in accordance with the present invention

Explanation of symbols on the main parts of the drawings

2: outer group 3: washing tank

5: motor

In order to achieve the above object, the present invention provides a washing machine that sequentially proceeds washing, rinsing, draining, dehydration over a predetermined time after the laundry is put into the washing tank and water supply; The dehydration load detection method of the washing machine is characterized by measuring the acceleration time from the starting point of acceleration until the rotation speed of the dehydration tank reaches the constant speed during acceleration of dehydration and detecting the amount of load. do.

According to another aspect of the present invention for achieving the above object, the present invention provides a washing machine that sequentially proceeds washing, rinsing, draining, dehydration over a predetermined time after the laundry is put into the washing tank and water supply; A dehydration load detection method of a washing machine is provided, which starts deceleration at a time point at a constant speed section during dehydration, measures a deceleration time from a deceleration start time to a predetermined RPM, and detects a load amount through the deceleration time.

The deceleration is characterized by the motor off.

The deceleration is characterized in that it is made by generating and braking the motor.

The deceleration is characterized in that the motor is made by reverse braking.

According to another aspect of the present invention for achieving the above object, in the laundry control operation of the washing machine to sequentially proceed with washing, rinsing, draining, dehydration over a predetermined time after the laundry is put into the washing tank and water supply; When dehydration proceeds, the motor torque is made constant and accelerated.The acceleration time from the start of acceleration until the rotational speed of the dehydration tank reaches the constant speed is measured and the load is detected through this.If the detected load is within the set range, the load According to the present invention, there is provided a washing control operation of the washing machine, wherein dehydration is performed at the maximum dewatering RPM set in accordance with the present invention, and the dehydration is stopped when it is determined that the detected load is greater than the set range.

On the other hand, according to another aspect of the present invention for achieving the above object, the present invention is a washing machine that proceeds the washing, rinsing, draining, dehydration sequentially over a period of time after putting the laundry in the washing tank and water supply; When dehydration is progressed, deceleration starts at the time point of the constant speed section, and the deceleration time from the deceleration start time until it drops to a predetermined RPM is detected, and the load is detected through this. If the detected load is within the set range, The dehydration is performed at the set maximum dewatering RPM, and when it is determined that the detected load is greater than the set range, the dehydration is stopped.

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

2 is a graph for explaining the principle of the dehydration load detection method of the present invention. It can be seen that the acceleration time ΔT1 is long when the load amount, that is, the load amount is long, and the deceleration time ΔT2 is long when the load amount is large.

On the other hand, Figure 3 is a graph showing the dehydration progression process according to the present invention, it shows the RPM change from the start of dehydration to the end of dehydration.

Referring to the drawings, one of the dehydration load detection method of the present invention, by accelerating to accelerate the motor torque during the dehydration progress, and measures the acceleration time (ΔT1) from the acceleration start point until the rotational speed of the dehydration tank reaches a constant speed This is to detect the load through this.

On the other hand, the washing machine operation control process through the load detection method according to the acceleration time measurement is as follows.

First, the motor torque is made constant during acceleration of dehydration, and the acceleration time ΔT1 from the acceleration start point until the rotational speed of the dehydration tank reaches a constant speed is measured.

Then, the load amount according to the measured acceleration time DELTA T1 is detected. That is, the smaller the load, the smaller the load on the motor and the greater the angular acceleration.

Accordingly, when the detected load amount is within the set range, dehydration is performed at the maximum dewatering RPM set according to the load amount, and when the detected load amount is determined to be overload greater than the set range, the dehydration is stopped.

Hereinafter, another one of the dehydration load detection method of the present invention will be described.

In the dehydration load detection method according to another embodiment of the present invention, when dehydration proceeds, the deceleration starts at a time point at a constant speed section, and the deceleration time (ΔT2) from the deceleration start time to a predetermined RPM is measured and thus the load amount. Will be detected.

On the other hand, the washing machine operation control process through the load detection method according to the deceleration time measurement is as follows.

First, deceleration is started at a temporary point in the constant speed section during dehydration, and the deceleration time ΔT2 is measured from the deceleration start point to the predetermined RPM.

Then, the load amount according to the measured deceleration time ΔT2 is detected. That is, since the deceleration time ΔT2 is proportional to the inertia of the load and the inertia is proportional to the load amount, the load amount may be determined using this.

Accordingly, when the detected load amount is within the set range, dehydration is performed at the maximum dewatering RPM set according to the load amount, and when the detected load amount is determined to be overload greater than the set range, the dehydration is stopped.

On the other hand, the deceleration in the above may be made by the motor off, or may be made by the power generation braking to short the three phases of the motor to form a closed circuit, by the reverse phase braking to generate the rotational force in the opposite direction It may be done.

In short, the present invention measures the acceleration time ΔT1 and the deceleration time ΔT2 in a certain section by using the point that the acceleration time ΔT1 is long when the load is large and the deceleration time ΔT2 is long when the load is large. ) Accurate load can be detected through measurement, and if the detected load is within the set load, it will be driven at the set RPM. In case of overload, the dehydration tank will be stopped immediately to ensure the stability and reliability of the system.

That is, the present invention can accurately determine the load and time of dehydration by accurately detecting the load during dehydration, and effectively prevents the strike phenomenon caused by the instability of the system during overload, thereby improving system stability and reliability of the washing machine. You can do it.

As described above, the present invention accurately detects the load at the time of dehydration in the washing machine, and when the detected load is within the set load amount, it drives at the set RPM, and immediately stops the dehydration tank at the time of overload, thereby ensuring stability of the system. And reliability can be ensured.

Claims (7)

A washing machine which sequentially performs washing, rinsing, draining, and dehydration for a predetermined time after putting laundry into a washing tank and supplying water; The dehydration load detection method of a washing machine, characterized in that the acceleration of the motor constant by dehydration proceeds, and to measure the acceleration time from the acceleration start point until the rotation speed of the dehydration tank reaches a constant speed. A washing machine which sequentially performs washing, rinsing, draining, and dehydration for a predetermined time after putting laundry into a washing tank and supplying water; Dehydration load detection method of the washing machine characterized by starting the deceleration at the time point of the constant speed section during the dehydration progress, by measuring the deceleration time from the start of the deceleration until it falls to a predetermined RPM. The method of claim 2, Decelerating load detection method of the washing machine characterized in that the deceleration is made by the motor off. The method of claim 2, Decelerating load detection method of the washing machine characterized in that the deceleration is made by generating and braking the motor. The method of claim 2, The deceleration is a dewatering load detection method of the washing machine, characterized in that the deceleration is made by braking the motor. In the washing control method of the washing machine to sequentially perform washing, rinsing, draining, dehydration for a predetermined time after the laundry is put into the washing tank and water supply; When dehydration proceeds, the motor torque is made constant and accelerated, and the acceleration time from the start of acceleration until the rotation speed of the dehydration tank reaches the constant speed is detected and the load is detected through this. When the detected load amount is within the set range, dehydration is performed at the maximum dewatering RPM set according to the load amount, and when it is determined that the detected load amount is greater than the set range, the dehydration is stopped. This is provided. A washing machine which sequentially performs washing, rinsing, draining, and dehydration for a predetermined time after putting laundry into a washing tank and supplying water; When dehydration is progressed, deceleration starts at the time point of the constant speed section, and the deceleration time from the start of deceleration to the predetermined RPM is measured, and the load is detected through this. When the detected load amount is within the set range, dehydration is performed at the maximum dewatering RPM set according to the load amount, and when it is determined that the detected load amount is greater than the set range, the dehydration is stopped. .