JPH05184769A - Controller for drum type washing machine - Google Patents

Abstract

PURPOSE:To achieve a removal of a liquid while preventing the generation of abnormal vibration by detecting vibration with a vibration detection switch in a process of removing the liquid at the number of revolutions reduced from the number of revolutions found of the detection of vibration when the number of revolutions at the detection of vibration is larger than a specified number of revolutions. CONSTITUTION:In a drum type washing machine, firstly, washing is loosened in a drum 12 with a low-speed rotation of a motor 14, and then, a removal of a liquid is performed with a high-speed rotation of the motor 14. At this point. when an outer washing tank 9 causes a vibration exceeding an al lovable value to activate a vibration detection sensor 26, the number of revolutions of the drum 12 is detected with a number of revolutions sensor 25 and the number of revolutions N detected is compared with a specified number of revolutions N0 predetermined using a microcomputer. When N>N0, the number of revolutions is reduced to a set number of revolutions less by 3-5% than the number of revolutions detected and the drum 12 is rotated for a specified time (about 3min.). Thereafter, a switching is made over to the number of revolutions of a higher speed in the residual time of the liquid removing process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type washing machine control device for washing and draining.

[0002]

2. Description of the Related Art When laundry is hard in the drum,
Abnormal vibration of the drum occurs when deliquoring due to high speed rotation. Therefore, it is necessary to loosen the laundry at a relatively low rotation speed to eliminate the eccentric load before the high-speed rotation at the time of draining liquid. Such a drum-type washing machine has already been disclosed in JP-A-60-261497. It is shown.

In such a conventional example, after the loosening of the low speed rotation is performed, the system is started at the high speed rotation, and when the vibration detection switch is activated, the loosening is performed again, and then the liquid is drained by the high speed rotation. In this state, the loosening effect due to low speed rotation cannot be achieved as desired, and the load can not be reduced due to liquid removal performed during rotation until vibration detection during that time, and the eccentric load cannot be eliminated, so shift to high speed rotation. It may not be possible and the cycle may be repeated many times. In such a case, when the vibration detection switch has been actuated a predetermined number of times in advance, the process is shifted to the next stroke without draining liquid by high speed rotation, or the stroke is ended by sounding a buzzer. (Fig. 7
(See the flowchart of

[0004]

It is an object of the present invention to perform drive control so as not to generate abnormal vibration even if the vibration detection switch is activated after the liquid removal process is started and the laundry is loosened at low speed. To do.

[0005]

SUMMARY OF THE INVENTION The present invention provides a drum type washing machine having a washing step for rotating a drum at a low speed and a dewatering step for rotating at a high speed, and performing a loosening operation at a low speed during the dewatering step. A motor that drives the drum, a drive circuit that drives by changing the rotation speed of this motor, and a vibration detection switch that detects abnormal vibration of the drum,
A drum rotation speed sensor for detecting the rotation speed at the time of occurrence of abnormal vibration, and a control means for controlling the progress of the stroke are provided, and when the detected rotation speed detected by the rotation speed sensor is lower than a predetermined rotation speed, the speed is reduced again. When the rotation speed is loosened and the detected rotation speed is high, the liquid removal process is controlled at the set rotation speed which is reduced by about 3 to 5% from the detected rotation speed. Then, the detected rotation speed is compared with a predetermined rotation speed, and when the detected rotation speed is high, the liquid is driven to drain at a set rotation speed for a predetermined time, and then switched to a predetermined high-speed rotation to perform the drainage stroke control.

[0006]

[Operation] Vibration is detected by the vibration detection switch. When the rotation speed is higher than the predetermined rotation speed, liquid removal is performed at a rotation speed that is slower than the rotation speed at the time of vibration detection, and at a rotation speed that does not cause vibration. Perform the liquid stroke.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in FIGS. The present invention is not limited to this.

In FIGS. 1 and 2, 1 is a top plate, 2 is an exterior frame, and a door 3 is pivotally supported by a hinge 4 so as to be opened and closed so that an object to be cleaned can be put in and taken out. There is.
Reference numeral 5 is a door lock, and 6 is an operation panel provided with a select button 7 such as a start and an operation program and a display section 8 for displaying each content.

Reference numeral 9 denotes an outer washing tub, which is attached to the exterior frame 2.
It is suspended by a suspension spring 10 and a shock absorber 11. A horizontal shaft type drum 12 is positioned inside the outer washing tub 9 and is supported by a bearing 13. A washing motor 14 is attached to the lower portion of the outer washing tub 9, and the pulleys 15, 16 and V are controlled by a variable means such as an inverter.
The drum 12 is driven via the belt 17. A drain valve 18 is provided at the bottom of the outer washing tub 9 and is connected to the outside of the machine by a hose 19. Reference numeral 21 is a pressure sensor, which is in communication with the air-trap chamber 20 and which is the liquid level (water level) in the outer washing tub 9.
Is detected by pressure. Reference numeral 22 denotes a water supply (hot water) valve, which is controlled by a signal from the pressure sensor -21.

Numeral 25 is a rotation speed detection sensor for detecting the rotation speed of the drum 12, which is provided near the metal arm 16 'of the pulley 16 and is connected to the next metal arm as the pulley 16 rotates. Mu 1
The number of revolutions is detected from the time from the passage of 6'to the passage of the next arm.

Reference numeral 26 is a vibration detection switch composed of a mercury switch for detecting the vibration of the drum 12. The vibration detection switch 26 is attached to the outer washing tub 9 and detects the vibration of the outer washing tub 9 to detect the vibration of the drum 1.
The vibration of 2 is detected.

FIG. 3 is a circuit block diagram showing a control circuit. Reference numeral 31 is a microcomputer (hereinafter abbreviated as a microcomputer) including a CPU, a ROM and a RAM, which is an I / O port 3
A signal is output to the display unit 8 via 2, and an instruction signal of the rotation speed of the drum 12 is input / output to / from the drive signal circuit 33 of the washing motor 14.

Further, the microcomputer 31 has an I / O port 3
The rotation speed signal from the rotation speed detection sensor 25 and the detection signal from the vibration detection switch 26 are input via 2.

The operating principle of the present invention will be described below with reference to FIGS. First, the drum 12 completes the washing process by the washing rotation of the motor 14 (about 45 rpm), and enters the draining process. In the liquid removal process, the drum 12 unravels the laundry by driving the motor 14 at low speed (about 100 rpm) for a predetermined time of about 30 seconds (S-51), and then starts driving at high speed (about 800 rpm). To do. When the vibration detection switch 26 does not operate in S-52, that is, of
In the case of f, the vibration is within the set allowable unbalanced load, the high speed rotation is performed for a predetermined time of about 8 minutes, and the liquid removal process is completed (S-53).

However, in S-52, when the outer washing tub 9 has an unacceptable vibration and the vibration detection switch 26 is activated, the rotation speed detection sensor 25 detects the rotation speed of the drum 12 at that time (S-54). ). The rotation speed is set to I / O port 32.
It is stored in the microcomputer 31 via. Then, the detected rotation speed is set to a predetermined rotation speed (for example, a medium speed rotation speed of about 5
50 rpm) (S-55), when the detected rotation speed is large, the speed is reduced to a set rotation speed that is 3% to 5% less than the detected rotation speed, and the drum 12 is rotationally driven for 3 minutes. The remaining deliquoring stroke time is switched to the high speed rotation speed to control the deliquoring stroke, and the process ends (S-53).

On the other hand, when comparing the detected rotation speed with the predetermined rotation speed, if the eccentric load amount is too large and the detected rotation speed is small, the high speed rotation is stopped, and the operation returns to (S-51) to rotate at a low speed. Do the loosening again. Then, after further loosening the entanglement in the washing process, high-speed rotation start is performed, and the vibration detection switch 26 detects the vibration again in S-52. When the control is performed up to this stage in this way, the dewatering progresses from the beginning, the load is lightened, the loosening effect is enhanced, and the eccentric load state is alleviated. Therefore, the rotational speed of the drum 12 becomes higher than the predetermined rotational speed. The vibration detection switch 26 is activated for the first time in this state, and after that, the drive control can be performed for a new liquid removal process in which the vibration detection switch 26 does not operate.

That is, the drive control of the new dewatering process does not have to be restarted from loosening due to low speed rotation when vibration is detected, but when the rotation speed at the time of vibration detection has reached the predetermined rotation speed. Since the eccentric load amount can be reduced by increasing the liquid removal rate by driving by decreasing the number of rotations by a predetermined number, the drive control of the liquid removal process can be performed without detecting vibration even after shifting to high speed rotation. You can do it.

The vibration detection switch 2 is shown in FIGS.
6 sets the number of rotations of the drum 12 at 200 when the vibration is detected.
It represents the type of load varied to 400 rpm, and 1 to 7% on the horizontal axis indicates how much the rotational speed detected by the rotational speed sensor 26 in S-54 of FIG. 4 is reduced by what percentage to rotate the drum 12. It is a thing. And N-20 indicates that each test was performed 20 times, and ○ indicates a certain percentage.
Vibration detection switch 2 when liquid is drained at the reduced rotation speed
6 shows the case where 6 did not work.

Further, the mark X indicates that the vibration detection switch 26 is still activated even when it is rotated by a certain percentage.
The number after the x mark indicates how many times the vibration was detected in the 20 tests.

For example, the load A will be described as S-
Although the rotational speed after 55 was driven for a predetermined time (for example, 3 minutes) at a set rotational speed that is 1% lower than the vibration detection rotational speed,
It shows that vibration was detected 20 times. Next, similarly, in the case of the set rotation speed which is 2% lower than the vibration detection rotation speed, it is shown that the vibration is detected three times, and 3% to
The mark ◯ is attached to indicate that vibration was not detected at the set rotation speed reduced by 7%.

On the other hand, with respect to the load C, it is shown that vibration was detected once in 20 tests when the load C was driven at a set rotation speed that was 3% and 5% lower than the vibration detection rotation speed. There is. Since this one test is one of 20 tests, it can be ignored. Therefore, it can be understood from FIG. 5 that the liquid removal drive may be controlled at a set rotation speed that is 3 to 5% lower than the vibration detection rotation speed.

FIG. 6 is a graph showing the liquid removal performance,
(A) is a high speed rotation (800 rpm), (b) is a predetermined rotation speed (medium speed rotation 550 rpm), (c) is a load A, and the rotation speed is reduced by 3% after the vibration is detected. When the liquid removal process is driven, (d) shows the respective liquid removal performance when the remaining speed is changed to high speed rotation after being driven for 3 minutes at the set rotation speed of (c).

That is, it can be understood that the d-curve in FIG. 6 has the value of the residual liquid amount of the clothes which is the closest to the a-curve at the time of high speed rotation at the end of the liquid removal process. It is driven at a set speed that is 3% slower than the speed at the time of vibration detection, and the load weight can be reduced more by draining for a predetermined time (the drainage efficiency is higher than the C curve in the graph until about 3 minutes). Is better),
In the experimental example, a deliquoring rate of about 40 to 45% is obtained at a medium speed, but after that, high speed rotation driving is performed. By driving at the set number of revolutions for a predetermined time in this way, the load weight can be reduced and the occurrence of abnormal vibration can be prevented from occurring again, and the liquid removal stroke control can be performed without significantly reducing the liquid removal rate. It can be controlled efficiently within a predetermined time.

[0024]

According to the present invention, since the liquid removal driving rotation speed is controlled after the vibration is detected to perform the liquid removal, the liquid removal process in which the abnormal vibration is prevented from occurring again within the predetermined liquid removal process time is controlled. can do.

Further, after the dewatering drive rotation speed is controlled and the dewatering is performed for a predetermined time, abnormal vibration does not reoccur even if the high speed rotation is switched, so that the dewatering process can be controlled without significantly reducing the dewatering effect. ..

[Brief description of drawings]

FIG. 1 is an external view of a drum type washing machine of the present invention.

FIG. 2 is a rear view of the same.

FIG. 3 is a circuit block diagram showing a control circuit of the same.

FIG. 4 is a flowchart showing the operation of the embodiment.

FIG. 5 is a detection experiment data showing the result of the vibration test of the liquid removal control
Ta.

FIG. 6 is a performance graph showing liquid removal performance.

FIG. 7 is a flowchart showing a conventional general operation.

[Explanation of symbols]

 12 drum 14 motor 25 rotation speed detection sensor 26 vibration detection switch

Claims (2)

[Claims] 1. A drum type washing machine having a washing process for rotating the drum at a low speed and a dewatering process for rotating at a high speed, and performing a loosening operation by a low speed rotation during the dewatering process, a motor for driving the drum. A drive circuit that drives the motor by changing the rotation speed of the motor, a vibration detection switch that detects abnormal vibration of the drum, a drum rotation speed sensor that detects the rotation speed when abnormal vibration occurs, When the detected rotation speed detected by the rotation speed sensor is lower than a predetermined rotation speed, a loosening operation of low speed rotation is performed again, and when the detected rotation speed is high, the detection rotation speed is increased. A control device for a drum-type washing machine, which controls a dewatering process at a set number of revolutions that is approximately 3 to 5% less than the number of revolutions. 2. The detected rotation speed is compared with a predetermined rotation speed, and when the detected rotation speed is high, the liquid is driven to drain at a set rotation speed for a predetermined time, and then switched to a predetermined high-speed rotation to perform the drainage stroke control. Item 1. A control device for a drum type washing machine according to Item 1.