JPS61125390A - Rinse process controller of washing machine - 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 <Industrial Field of Application> The present invention relates to a rinsing process control device for a washing rock.

<Conventional technology> The rinsing process of a washing machine involves repeating rinsing while exchanging the rinsing liquid (water) until the detergent ingredients are sufficiently reduced, which eliminates waste of electricity and water and reduces damage to fabrics. In order to do this, it has already been proposed to detect the turbidity of the rinsing liquid and terminate the rinsing process when the detergent components in the liquid reach a certain reference value. In this case, the speed of the washing motor was constant, and the speed was not changed as the rinsing process progressed.

<Problems to be Solved by the Invention> In the conventional rinsing process, rinsing is repeated at the same motor speed, which tends to cause fabric stains and fabric tangles, and there are also problems in that power is wasted.

The present invention has been made for the purpose of solving this problem and providing a washing machine that can reduce cloth damage and cloth tangles and save power consumption.

<Means for Solving the Problems> In order to achieve the above object, the rinse stroke control device of the present invention includes a rinse sensor that detects the turbidity of the rinse liquid, and a speed control that variable-speed controls the speed of the washing motor. the turbid liquid detected by the rinsing sensor and its rate of change are compared with a preset change rate reference value and a turbidity reference value; If the turbidity is below the turbidity standard value when the change rate is below the change rate standard value, the rinsing process is terminated, and if the turbidity exceeds the turbidity standard value, the rinsing liquid is supplied to the next rinse. The present invention is characterized by comprising a control section that repeats the rinsing process while decreasing the speed of the washing motor compared to the previous rinsing process.

Effect> In the device of the present invention, rinsing is repeated when the turbidity change rate is below the change rate standard value and the turbidity exceeds the turbidity standard value, and the speed of the washing motor is sequentially decreased each time the rinsing is repeated. This reduces wasteful power consumption and fabric stains and fabric tangles during the rinsing process.

<Example> Hereinafter, one example shown in the drawings will be specifically described.

Figure 1 is a block diagram of the control device, where 1 is a ROM (for storing control programs, etc.), 2 is a RAM for temporarily storing data necessary for control, 3 is a timer, and 4 is a CPU for control. and l10g, 5 is a rinse start switch, 6 is a rinse sensor that detects the turbidity of the rinse liquid, 7 is a rotation speed sensor that detects the rotation speed of the washing motor, and 8 is a washing machine that uses the output from the control section 4. A drive circuit that opens and closes the motor circuit, 9 is a frequency transmitter, IO is a single-phase AC power supply, 11 is an inverter, 12 is a three-phase washing motor, 1
3 is an opening/closing means such as a relay.

As the rinse sensor 6, for example, a type of sensor whose output voltage decreases in accordance with an increase in turbidity is used. Figure 2 shows an example of the relationship between the rinsing time and the sensor output.As shown in the figure, the output voltage (■) decreases with the passage of time t, but the rate of change decreases as time passes, and eventually the change occurs. I won't.

Further, the inverter 11 changes the rotation speed of the washing motor 12 according to the output of the frequency transmitting section 9 which is controlled by the output of the control section 4, and as illustrated in FIG. The rotational torque characteristic changes as shown in T0 to T), and the rated rotational speed is controlled as variable speed as shown in R0 to R1.

Next, the operation will be explained with reference to charts 70 shown in FIGS. 4(a) to 4(C).

After the laundry has been sufficiently washed in the washing process, the dirty liquid is drained and the rinsing process shown in FIG. 4(a) is started. First, after water is supplied, timer 3 starts, and washing motor 1 starts.
2 is driven. At this time, the motor rotation speed R is controlled by the frequency transmission n9 and the inverter 11 so that it becomes a preset steady rotation speed R0. At the same time, reading of the output voltage V(t) of the rinse sensor 6 is started in order to detect the turbidity of the rinse liquid.

The degree of progress of rinsing is detected by the rate of change in the output voltage (2) read every predetermined period of time. That is, the rate of change is detected as follows, this is compared with a predetermined rate of change reference value S0, and when the rate of change is less than 80, it is determined that the detergent from the clothes can no longer be taken out.

Next, the average value of the sensor output voltage V(t), ↓ and Ω, is a predetermined reference value ■. Compared to , the average value is ■. If the size is larger, rinsing is judged to be insufficient, as shown in Figure 4 (b).
Move to. In other words, the washing motor 2 is stopped and the timer 3 is stopped.
The water is cleared, the rinsing liquid is drained, and new water is supplied.
The motor rotation speed RN for the next rinse is set. The motor rotation speed RN is calculated as -N RN=□·R, (A and N are constants and A>N), and the rinsing shown in Figure 4(a) is repeated again at a rotation speed RN smaller than Ro. This repetition is the sensor output voltage V(
The average value of t) is the reference value ■. This is repeated until the number of revolutions reaches RI TR, R, . . . with each repetition.

After rinsing is repeated in this way, the sensor output voltage V
The average value of (t) is ■. When the amount is below, it is determined that rinsing is sufficient, and the process moves to FIG. 4(c), where the rinsing process ends.

Generally, when the amount of detergent in the clothes is reduced due to repeated rinsing, even if the washing motor 12 is operated at the same high speed as when there is a large amount of detergent, the effect of removing the detergent will not be very high, and the However, in this embodiment, rinsing is repeated while detecting the turbidity of the rinsing liquid using the output voltage of the rinsing sensor 6, and the rotational speed of the washing motor 12 is lowered each time. As a result, it is possible to reduce stains and stains on clothes while obtaining an appropriate rinsing effect.

Although the above embodiment is an example in which rinsing is performed after stopping the water, which is the rinsing liquid, the present invention can of course also be practiced in the case of a rinsing process in which rinsing is performed while continuously supplying water. <Effects of the Invention> As is clear from the description of the above-mentioned embodiments, the present invention provides a method for comparing the turbidity of the rinsing liquid and its rate of change with a predetermined turbidity reference value and a predetermined rate of change reference value. The rinsing process is repeated until the rinsing is sufficiently done, and the speed of the washing motor is gradually lowered each time the rinsing process is completed.This allows rinsing to be carried out effectively while reducing stains and dirt on the clothes. This makes it possible to reduce unnecessary power consumption.

[Brief explanation of the drawing]

Figure w & 1 is a block wiring diagram of one embodiment of the present invention,
The figure is a characteristic diagram showing an example of the output characteristics of the rinse sensor, Figure 3 is a characteristic diagram showing an example of the operating characteristics of the washing motor, and Figures 4 (a), (b), and (c) are the control ++-) figure. 1...ROM, 4...Control unit 6...
Rinse sensor, 11... Inverter 12... Washing motor

Claims (1)

[Claims] A rinsing sensor that detects turbid liquid in the rinsing liquid, a speed control means that variable speed controls the speed of the washing motor, a storage means that stores a program for controlling the rinsing process, and a turbid liquid detected by the rinsing sensor. Compare the change rate with a preset change rate reference value and turbidity reference value, and if the turbidity is less than the change rate reference value and the turbidity is less than the turbidity reference value, terminate the rinsing process, A washing machine rinsing device comprising: a control unit that moves to the next rinsing when the turbidity exceeds a turbidity reference value, and repeats rinsing by lowering the speed of the washing motor compared to the previous rinsing. Stroke control device.