KR19990042139A - Cover open and unbalance detection device and control method of washing machine - Google Patents

Abstract

The present invention relates to a cover opening and unbalance detection device and a control method of a washing machine, and more particularly, to a cover opening and unbalance of a washing machine that can prevent malfunction by moisture and contact damage and eliminate operation noise by using a self-driven switch. It relates to a sensing device and a control method.

By the unbalance detection device of the washing machine according to the present invention, by using a reed switch which is a self-driven switch, by implementing a detection device for detecting the opening and closing of the washing machine cover and the unbalance of the washing machine to prevent malfunctions due to moisture and contact damage and operating noise Can be eliminated to increase the reliability of the device.

Description

Washing machine cover open and unbalance detection device and control method

The present invention relates to a cover opening and unbalance detection device and a control method of a washing machine, and more particularly, to a cover opening and unbalance of a washing machine that can prevent malfunction by moisture and contact damage and eliminate operation noise by using a self-driven switch. It relates to a sensing device and a control method.

In general, a washing machine uses a motor as a power to drive a rotary blade (also called a pulse shader) or an agitator (edge data) to form a stream of water, which causes the laundry to impact the laundry.

1 is a cross-sectional view of a conventional washing machine.

2 is a block diagram of an unbalance detection device of a conventional washing machine.

Referring to FIG. 1, a general washing machine includes a main body 10 in which a water tank 13, a dehydration tank 14, and an agitator 15 are installed, and a cover 12 on an upper surface of the main body 10. ) Is provided with the upper cover 11 is coupled. A power motor 17 is provided below the water tank 13, and a transmission 16 is provided on one side of the power motor 17.

The washing machine configured as described above allows the transmission 16 to shift the rotation of the power motor 17 so that the stirrer 15 is rotated forward and reverse to perform the washing stroke, and the dehydration tank 14 is rotated to dehydrate the stroke. Let's do it.

On the other hand, there was a need for a device for controlling the irregular movement of the dehydration tank 14 and the water tank 13 by the unbalance that may occur during dehydration administration. Thus, an unbalance detection switch is provided on one side of the upper cover 11. In addition, the unbalance switch 1 is hinged of the washing machine cover 12 so that the unbalance switch 1 is turned on when the cover 12 is opened.

When irregular movement of the dehydration tank 14 occurs due to unbalance during the dehydration stroke, the water tank 13 is shaken. When the water tank 13 is shaken, the upper portion of the water tank 13 pushes the unbalance switch 1 on and restores it to its original position, thereby turning off the unbalance switch 1. The water tank 13 is shaken in accordance with the rotation of the dewatering tank 14 which is irregularly moved by unbalance, and thus the unbalance switch 1 is intermittently turned on / off.

When the unbalance switch 1 is turned on, the input signal falls to the microcomputer 20 which has maintained high, but the high signal and the low signal are irregularly repeated and input to the microcomputer 20.

The microcomputer 20 detects unbalance according to the input from the unbalance switch 1. If the signal input from the unbalanced switch 1 to the microcomputer 20 remains high, but the high signal and the low signal are irregularly repeated, the microcomputer 20 detects the unbalance and stops the motor driver 30 to power the motor. ) Stop the rotation.

However, if the user opens the cover 12 of the washing machine during the dehydration administration, the unbalanced switch 1 connected to the cover 12 by a hinge is turned on. When the unbalance switch 1 is turned on, the input signal falls to the microcomputer 20 that has maintained a high level and is input to the microcomputer 20. The input signal at this time is a low signal that continues for a predetermined time.

That is, the microcomputer 20 senses unbalance according to the input from the unbalanced switch 1, and if the signal input from the unbalanced switch 1 to the microcomputer 20 remains high and then falls to low, When the microcomputer 20 determines that the cover 12 of the washing machine is opened, the microcomputer 20 stops the motor driving unit 30 to stop the rotation of the power motor 17.

However, the conventional unbalance detection device is driven by a mechanical operation, and the contact of the switch may be damaged during repetitive operation, and the contact may be damaged by moisture. Thus, there is a risk of malfunction, and the reliability of the product is lowered. In addition, there was a problem that generates the operation noise when the unbalance switch.

The present invention has been made to solve the above problems, the object of the present invention is to provide a cover opening and unbalance detection device of the washing machine that can prevent malfunction by moisture and contact damage by using a magnetic drive type switch and eliminate operation noise. I would like to.

1 is a cross-sectional view of a conventional washing machine.

2 is a block diagram of an unbalance detection device of a conventional washing machine.

3 is a cross-sectional view of a washing machine equipped with an unbalance detection device for a washing machine according to the present invention.

4 is a block diagram of an unbalance detection device of a washing machine according to the present invention.

5 is a control flowchart of an unbalance detection device of a washing machine according to the present invention.

6 is an operation diagram when a magnetic field is not applied to the magnetically driven switch of the unbalance detection device of the washing machine according to the present invention.

7 is an operation diagram when a magnetic field is applied to the magnetically driven switch of the unbalance detection device of the washing machine according to the present invention.

8 is an operation waveform of the unbalance detection device of the washing machine when the cover of the washing machine according to the present invention is opened.

Explanation of symbols on the main parts of the drawings

42: cover 44: water tank 45: dewatering tank 48: motor

50: magnet 60: lead switch 70: microcomputer 80: motor drive unit

Cover opening and unbalance detection device and control method of the washing machine according to the present invention for realizing the above object, a power motor for generating power, a transmission for shifting the rotation of the power motor, a dehydration tank connected to the transmission to perform dehydration, A cover covering the dehydration tank, a magnetic field generating unit provided outside the dehydration tank to generate a magnetic field, a magnetic drive switch for outputting an unbalance signal or an open cover signal by a magnetic field generated by the magnetic field generating unit, and an unbalanced output of the magnetic drive switch. The microcomputer is configured to receive a signal or a cover open signal as an input, and determine whether the dehydration tank is unbalanced or whether the cover is open or closed to turn on / off the power motor. Then, the operation of the washing machine according to the setting step of setting the operating state of the washing machine, the operation step of operating the washing machine according to the setting set in the setting step, the signal detection step of detecting the operation signal during the operation step, the signal detected during the predetermined time If the signal detected in the signal detection step is not an unbalanced signal, the result of the determination of the unbalanced signal that determines whether the signal is an unbalanced signal, which is a signal repeated between the normal signal and the threshold signal, the operation signal detected in the signal detection step is predetermined. If the operation signal is determined to be an unbalanced signal in the cover open determination step, an unbalance determination step that determines whether the cover open signal is a signal that maintains the threshold signal for a time, or the operation signal is determined to be a cover open signal in the cover open determination step, the corresponding alarm And stopping the operation of the washing machine. A method which comprises.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view of a washing machine equipped with an unbalance detection device for a washing machine according to the present invention.

4 is a block diagram of an unbalance detection device of a washing machine according to the present invention.

5 is a control flowchart of an unbalance detection device of a washing machine according to the present invention.

6 is an operation diagram when a magnetic field is not applied to the magnetically driven switch of the unbalance detection device of the washing machine according to the present invention.

7 is an operating waveform when a magnetic field is applied to the magnetically driven switch of the unbalance detection device of the washing machine according to the present invention.

8 is an operation waveform of the unbalance detection device of the washing machine when the cover of the washing machine according to the present invention is opened.

In the washing machine according to the present invention, a water tank 44, a dehydration tank 45, and a stirrer 46 are provided with a main body 40 installed therein, and an upper surface of the main body 40 is provided with a cover 42 on its upper surface. The upper cover 41 is attached to it. A power motor 48 is provided below the water tank 44, and a transmission device 47 is provided on one side of the power motor 48. In addition, a magnet 50 is provided at one side of the water tank 44, and a magnetically driven switch, that is, a reed switch 60, is turned on and off by a magnetic field generated by the magnet 50. And the reed switch 60 is hinged 43 so as to move toward the magnet 50 when the cover 42 is opened.

On the other hand, the reed switch 60 is a magnetically driven switch enclosed in the glass tube 64 together with the inert gas 63 so as to have a suitable overlap and gap in the lead pieces 61 and 62 in which the magnetic material is pressed. If the type of the reed switch 60 is classified by function, a type A (make type) to be shorted by applying a magnetic field, a type B (brake type) to be opened when a magnetic field is applied, and a type C or D (which transfers when a magnetic field is applied) transfer type). Since the reed switch is sealed with glass, it is not affected by contact failure, etc., and the response speed is fast and there is no fear of moisture penetration. The type of reed switch used in the present invention is an A type (make type) which is shorted by applying a magnetic field.

First, in order to operate the washing machine, the microcomputer 70 sets a function, but the user may set the function directly. At this time, the microcomputer 70 sets the water level of the tank, washing time, dehydration time and the like (S10).

After setting, the microcomputer 70 performs the washing operation (S20).

When the laundry administration (S20) of the laundry is finished, the microcomputer 70 performs dehydration administration (S30). Then, the microcomputer 70 detects an unbalanced switch, that is, an input signal from the reed switch 60 (S40).

The microcomputer 70 determines whether the input signal from the reed switch 60 is a signal repeated from high to low or from low to high for a predetermined time (S50). If it is determined in S50 that the input signal from the reed switch 60 is a signal repeated from high to low or low to high for a predetermined time, the microcomputer 70 determines that it is unbalanced.

The unbalanced case is described as follows.

When the dehydration tank 45 is irregularly moved by debalance during dehydration, the dehydration tank 45 swings left and right. When the dehydration tank 45 swings left and right, the water tank 44, which was not shaken in a normal state, is shaken (a and b directions in FIG. 4). When the water tank 44 is shaken, the magnet 50 attached to the outside of the water tank 44 approaches the reed switch 60 as shown in FIG. 4 and moves away according to the shaking of the water tank 44. 4 direction) will be repeated.

When the magnet 50 approaches the reed switch 60 within a predetermined distance due to unbalance, that is, the dehydration tank 45 is irregularly rotated by the unbalance so that the magnet 50 provided in the water tank 44 is a predetermined distance. The reed switch 60 is turned ON when it approaches within the reed switch 60 within this time.

When the reed switch 60 is ON, the unbalanced signal inputted to the microcomputer 70 that was held high by the power supply Vcc drops to low. When the reed switch 60 is turned off, the microcomputer ( 70 is input high. When the aforementioned unbalance occurs, the reed switch 60 alternately inputs the low or high to the microcomputer 70 while repeating the on / off. At that time, the microcomputer 70 determines that an unbalance has occurred.

If it is determined in S50 that the unbalance has occurred, the microcomputer 70 drives the alarm unit 90 to give an unbalance warning S51 and turns off the motor driving unit 80 to stop the motor 48 (S80). ). Thus, dehydration administration is stopped.

However, if the input signal from the reed switch 60 is not a signal repeated from high to low or low to high for a predetermined time in the determination (S50), the microcomputer input signal from the reed switch 60 for a predetermined time. It is determined whether to maintain a low (S60)

If it is determined in S60 that the input signal from the reed switch 60 is kept low for a predetermined time, the microcomputer 70 determines that the cover 42 of the washing machine is opened. When it is determined that the cover 42 of the washing machine is opened, the microcomputer 70 drives the alarm unit 90 to warn the opening of the cover (S61) and turns off the motor driving unit 80 to stop the motor 48 (S80). ). Thus, dehydration administration is stopped.

By the way, if the input signal from the reed switch 60 is not the signal that the input signal from the reed switch 60 is kept low for a predetermined time in the determination (S60), the microcomputer 70 is dehydration set in step (S10). It is determined whether the time is up (S70).

If the dehydration time has not ended in the determination S70, the microcomputer 70 continues the dehydration stroke. However, if the dehydration time is finished in the determination (S70), the microcomputer 70 stops the motor 48 by turning off the motor driving unit 80 (S80). Thus, the dehydration administration ends.

Looking at the ON / OFF (OFF) operation of the reed switch 60 due to unbalance as follows.

When the dehydration tank 45 is dehydrated normally without unbalance, the magnet 50 and the reed switch 60 provided on the outer side of the water tank 44 maintain a constant distance. The predetermined distance between the magnet 50 and the reed switch 60 is a distance at which the magnetic field generated by the magnet 50 does not affect the reed switch 60. At this time, since the reed switch 60 is not affected by the magnetic field, the reed switch 60 is turned off, that is, the contact is opened (as shown in FIG. 6). As shown in FIG. 6, the reed 61 and the reed 62 are mutually inclined. Away. In this case, the high signal is output to the microcomputer 70 by the power supply Vcc.

However, if unbalance occurs in the dehydration stroke, the dehydration tank 45 has an irregular rotational motion. When the dehydration tank 45 is irregularly rotated, the water tank 44 is shaken, and the magnet 50 provided on the outside of the water tank 44 which maintains a constant distance with the reed switch 60 is the reed switch 60. Approach Accordingly, when the distance between the magnet 50 and the reed switch 60 is within a predetermined distance, the magnetic field generated by the magnet 50 affects the reed switch 60.

The ON / OFF operation of the reed switch 60 by opening and closing the lid 42 of the washing machine is as follows.

When the lid 42 of the washing machine is closed, the magnet 50 and the reed switch 60 are spaced apart by a predetermined distance as in the case where the above-described dehydration tank 45 operates without unbalance. In this case as well, the magnetic field generated by the magnet 50 does not affect the reed switch 60, and thus the reed switch 60 is not affected by the magnetic field. The contact of the reed switch 60 is in an open state (Fig. 6). The lead 61 and the lead 62 are separated from each other as shown in FIG. In this case, the high signal is output to the microcomputer 70 by the power supply Vcc.

However, when the user opens the cover 42 of the washing machine, the lid switch 60, which is connected to the cover and the hinge 43, moves toward the magnet 50 (multi-direction in FIG. 4). In this case, the reed switch 60 is affected by the magnetic field by the magnet 50.

The reed switch 60 affected by the magnetic field by the magnet 50 by the unbalance of the dehydration tank 45 and the opening of the cover 42 of the washing machine operates as follows.

The reed switch 60 according to the present invention has a normal open type in which the contacts between the leads 61 and 62 are separated (see FIG. 6) when the magnet 50 is separated and a magnetic field is not applied. Type).

First, the operation of the reed switch 60 by opening the cover 42 of the washing machine. Since the lead 61 of the reed switch 60 affected by the magnetic field is magnetic, it is magnetized under the influence of the magnet 50. The lead 62 is also magnetized under the influence of the magnetic field because the magnet 50 approaches, but is magnetized with a polarity opposite to that of the lead 61. Thus, the attraction force to each other occurs between the lead 61 and the lead 62. By the attraction force, the lead 61 and the lead 62 come into contact with each other as much as overlapping portions (Fig. 7D). At that time, a low is applied to the microcomputer 70. By the way, the signal generated by the opening of the washing machine cover 42 and input to the microcomputer 70 is continuously maintained low for a predetermined time. That is, when the cover 42 is closed (section a in FIG. 8), the input signal to the high microcomputer 70 is opened by the power supply Vcc and the cover 42 is opened (section b in FIG. 8) to close the cover. Is kept low until then (section c of FIG. 8).

This is when the reed switch 60 is operated by the dehydration tank 45 of the washing machine.

When the dehydration tank 45 operates normally, the input signal to the microcomputer 70 is high (section d in FIG. 9) by the power supply Vcc. However, when unbalance occurs and the dehydration tank 45 makes an irregular rotation movement, the water tank 44 is shaken accordingly. When the water tank 44 is shaken, the magnet 50 provided in the water tank 44 is the reed switch 60. The operation of the above-described reed switch 60 is repeated because of the proximity to and the distance. Thus, the input signal input to the microcomputer 70 is repeatedly converted from high to low or from low to high (section e of FIG. 9).

By the unbalance detection device of the washing machine according to the present invention, by using a reed switch which is a self-driven switch, by implementing a detection device for detecting the opening and closing of the washing machine cover and the unbalance of the washing machine to prevent malfunctions due to moisture and contact damage and operating noise Can be eliminated to increase the reliability of the device.

Claims (7)

Power motor for generating power, A transmission for shifting the rotation of the power motor, A dehydration tank connected to the transmission to perform dehydration, A cover for covering the dehydration tank, A magnetic field generating unit provided outside the dehydration tank to generate a magnetic field, A magnetic drive switch for outputting an unbalance signal or a cover open signal by the magnetic field generated by the magnetic field generator; And a microcomputer for turning on and off the power motor by determining whether the dehydration tank is unbalanced or whether the lid is opened or closed by receiving the unbalance signal or the cover open signal output from the magnetically driven switch. Cover opening and unbalance detection in the washing machine. The method of claim 1, The self-driven switch detects the opening and unbalance of the washing machine, characterized in that the dewatering tank is irregularly rotated due to unbalance and outputs the unbalanced signal to the microcomputer when the magnetic field generating unit provided in the dewatering tank is within a predetermined distance. Device. The method of claim 1, The magnetically driven switch is turned on / off by the magnetic field generated by the magnetic generator by approaching the magnetic generator within a predetermined distance when the lid is opened while the dehydration tank is in operation, and outputs the lid open signal to the microcomputer. Cover opening and unbalance detection device of the washing machine characterized in that. A setting step of setting an operating state of the washing machine; Operating the washing machine in accordance with the setting set in the setting step, A signal detection step of detecting an operation signal during the operation step; An unbalance determination step of determining whether the operation signal detected in the signal detection step is an unbalanced signal that is a signal repeating between a normal signal and a threshold signal for a predetermined time; As a result of the determination of the unbalance determination step, if the operation signal detected in the signal detection step is not the unbalance signal, whether the operation signal detected in the signal detection step is a cover opening signal, which is a signal for maintaining the threshold signal for a predetermined time. Determination of the cover open to determine the step, If the operation signal is determined to be the unbalance signal in the unbalance determination step, or the operation signal is determined to be the cover open signal in the cover open determination step, a corresponding alarm and stop operation of the washing machine; Cover opening and unbalance control method of the washing machine, characterized in that. The method of claim 4, wherein The threshold signal is low when the normal signal is high, the cover opening and unbalance control method of the washing machine. The method according to claim 4 or 5, If the operation signal is the unbalance signal in the unbalance determination step, an unbalance alarm and stops driving of the washing machine motor to stop the operation of the washing machine. The method according to claim 4 or 5, If the operation signal is the cover open signal in the unbalance determination step, the cover open and unbalanced control method of the washing machine, characterized in that to stop the operation of the washing machine by stopping the drive of the washing machine motor.