JPS60108084A - Control method of washer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method of controlling a washing machine, and more particularly to automatic setting of the amount of washing water according to the load on cloth.

(Prior art) In conventional washing machines, the amount of washing water can be set by the user supplying water according to the cloth load, and in automatic washing machines, the user operates a water level setting switch to set the water level. There is a method in which water is automatically supplied to a water level according to a setting switch, and in either case, the user determines the amount of washing water. For this reason, depending on the user's handling, washing may not be done with the optimum amount of water, and if the amount of water is low, not only will the washing not be done properly, but the time the cloth will be in direct contact with the pulsator will be longer. This caused the fabric to become longer and cause damage to the fabric. Also, if the amount of water is too large, washing may not be done properly, resulting in water loss.

Recently, as a solution to these shortcomings, the special public
As seen in Publication No. 8-80078, after water is supplied to the washing tub to the lowest water level, the motor is driven and the current flowing through the motor is detected, and the need for additional water supply is determined according to the average value of the current. A system has been proposed in which water is determined and additional water is supplied when necessary.

(White eyes) The above-mentioned drawbacks can be solved by a method different from the method shown in Invention 6:1, Japanese Patent Publication No. 58-30078, and after water is supplied to the lowest water level of the washing tub, the motor is driven for a predetermined period of time and then stopped, the fall time of the induced voltage in the motor windings during inert rotation of the motor is measured, the level of the fall time is determined, and when the level is above a predetermined level, the When the water is below a predetermined level, additional water is supplied to the water level corresponding to the level difference, and then the washing operation is started, so that washing and rinsing are always carried out with the appropriate amount of water according to the cloth load, resulting in less cloth damage and high water saving effect. It provides washing machines.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In the figure, the lFi washing tub 2 is a pulsator for stirring the laundry, and is driven by a motor 3. Reference numeral 4 denotes a motor 3f, a motor control section that controls the motor 3f.

This is a water supply valve for supplying water to the five washing tubs 1, and is controlled on/off by the water supply valve control section 6.

811-j This is an induced voltage detection section of the motor 3, and the motor 3
The time counter section 9 measures the time it takes for the detected voltage to fall to a certain predetermined value. . The level of this fall time is determined by the level determination section 10, and the water supply valve control section 6 operates based on this fall time level to adjust the amount of water supply.

7 is a water amount detection unit that detects the amount of water supplied to the washing tub l.

The operation of the above configuration will now be described.

When the washing start switch (not shown) is turned on, the water supply valve 5 is activated, and when the water is supplied to the lowest washing water level, the water amount detection section 7 activates the water supply valve control section 6, and the water supply valve 5 is turned off. The water supply will be stopped.

Then, when the motor control unit 4 drives the motor 3 for a certain predetermined time and then stops it, the power to the motor 3 is cut off.
Motor 3tr! The rotor rotates due to inertia, and at this time an induced voltage is generated in the windings due to the residual magnetism of the rotor, and this voltage changes depending on the rotation speed of the inertia. That is, when the cloth load is heavy, the rotation decreases quickly, and therefore the rate of drop of the induced voltage also increases. This voltage is detected by a motor induced voltage detection section 8, and a time counter section 9 measures the time required for this voltage to fall to a predetermined voltage value after cutting off power to the motor.

And level determination? Tl510 determines the level difference between this falling time level and a predetermined value.0 At this time, if the fabric load is large relative to the amount of water, the fabric will come into contact with the pulsator 2, so the load on the motor 8 will increase. As a result, the fall time is 9 hours (short).

Figure 2 shows the relationship between fabric load and fall time when the amount of water is constant. That is, by knowing the fall time, the fabric load amount can be known.

On the other hand, since the optimum amount of water for washing with respect to the cloth load is determined by the performance of each washing machine, the optimum amount of water can be determined based on the fall time. An example in which three water amounts can be set, low, medium, and high, will be explained with reference to FIG. When the fabric load is A or less, the optimum water amount is a low water amount, when it is between A and B, the medium water amount is, and when it is 8 or more, the high water amount is the optimal water amount. The fall time is 9 when a low amount of water is supplied.
Since time is measured, the predetermined value for level determination is T. When the fall time T is T≧T1, the washing process starts with the water amount remaining at a low level. Then, when T<T, the level difference IT, -Tl≦Δt, additional water is supplied to the medium water level, and then the washing process is started. If IT, -TI>Δt, additional water is supplied up to a high water amount, and then the washing process begins.

Figure 2 shows an example of three water volume settings;
1. Δt2. Δt3. By increasing the amount in multiple steps, it is possible to increase the determination level of the optimal water amount to multiple levels. Furthermore, if the fall time is extremely short, it is possible to notify with a buzzer or the like.

In addition, by installing a power supply voltage compensation circuit that detects fluctuations in the power supply voltage and changes the fall time judgment level according to the power supply voltage, it is possible to operate with the appropriate amount of water at all times without being affected by power supply voltage fluctuations. becomes. Furthermore, by changing the determination level depending on the power supply frequency, the influence of frequency can also be removed. In addition, as mentioned above, since the amount of fabric load can be determined from the fall time, the strength of the washing water stream can be appropriately controlled by changing the strength of stirring the laundry'f: according to the amount of fabric load. be able to. In other words, if the load on the fabric is small, the machine is operated at a weak water flow of 11, and as the load on the fabric increases, the strength of the water flow is increased, thereby making it possible to wash the laundry at a proper water flow with less damage (and without insufficient washing). Further, by changing the dehydration time depending on the cloth load, appropriate dehydration can be performed.

(Other Examples) After water is supplied to the lowest water level of the washing tub 1, the motor 3 is driven in the forward direction for a predetermined time, and then the motor 3 is driven in the reverse direction for a predetermined time and then stopped, and during the subsequent inertial rotation. The falling of the induced voltage may be measured for 9 hours.

In this way, the clothes to be washed that float near the water surface due to forward rotation can be determined by reverse rotation, and the cloth load can be detected more accurately. However, the driving time in the reverse direction must be shorter than the driving time in the forward direction, and must be set within a range in which the laundry and water do not lose their forward inertia force.

(Effects) As described above, according to the present invention, by an unprecedented method,
Washing and pampering can always be carried out with an appropriate amount of water according to the load on the cloth, resulting in less damage to the cloth and a high water-saving effect, resulting in significant practical effects.

A block diagram showing the system. Figure 2 is a diagram showing the relationship between the cloth load and the fall time of the induced voltage.Ol: Washing tub, 2:
pulsator, 3: motor, 4: motor control section, 5: water supply valve, 6: water supply valve control section.

7: Water amount detection section, 8: Motor induced voltage detection section, 9: Part of time counter.

Claims (1)

[Claims] 1. A motor for rotating a pulsator to agitate the laundry, a control unit for driving the motor, and a voltage detector for detecting the induced voltage in the motor windings during inertial rotation of the motor. a part of a time counter that measures the time until the voltage detected by the detection part falls to a predetermined value;
a level determination section for determining the level of the fall time measured by the time counter part; a water supply valve for supplying water to the washing tub; a water amount detection section for detecting the amount of water in the washing tub; and a water supply valve control valve that controls the opening and closing of the water supply section valve, and after supplying water to the lowest water level of the washing tub, the motor is driven for a predetermined time and then stopped, and the induced voltage in the motor winding during inertial rotation of the motor is controlled. The fall time of the novel is measured, the level of the fall time is determined, and when the novel is above a predetermined level, water is directly supplied, and when it is below a predetermined level, additional water is supplied to the water level according to the level difference, and then the washing is carried out. A method of controlling a washing machine by putting it into operation. 2. A patent claim made by driving the motor in the forward direction for a predetermined time, then driving it in the reverse direction for a predetermined time and stopping, and measuring the fall time of the induced voltage in the motor windings during the accompanying inertia rotation. A method for controlling a washing machine according to item 1.