JPS61181493A - Rinsing control in 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 (Technical Field) The present invention relates to a method for controlling rinsing in a washing machine.

(Prior art) Recently, a detector has been developed to detect the turbidity of the liquid in the tank, and a device detects the temporal change in the turbidity detected by the detector, and determines the end of rinsing when the change falls below a predetermined value. Comprising a rinsing end determining means, and a re-rinsing determining means for determining whether re-rinsing is necessary by taking an average value of turbidity at the beginning of rinsing and turbidity at the end of rinsing and comparing the average value with a reference value. A washing machine that can repeatedly perform rinsing up to three times has been proposed, but there is a risk that such washing machines may not be able to provide optimal rinsing due to the way the reference values are set.
This was a problem when it came to practical use.

(Purpose) The present invention has been made in view of the above points, and it is possible to eliminate insufficient rinsing and over rinsing by setting the reference values at the first and second re-rinsing judgments in an optimal relationship. This is what I did.

(Example) Examples of the present invention shown in the drawings will be described in detail below.

FIG. 1 is a block diagram showing a control system of a washing machine in an embodiment of the present invention. In Figure 1, 1 is an outer washing tank, 2 is
is water, 3 is the washing inner tank, 4 is the pulsator, 5 is the communication pipe, 6
1 is a turbidity detector that optically detects turbidity using a combination of a light emitting element and a light receiving element; 7 is a conduit pipe for draining water in the tank through a drain valve 11; 8 is a motor; and 9 is a motor control unit. be.

10 is a turbidity determination unit, which has a memory function to store the detected value from the turbidity detector 6, an arithmetic function to calculate the temporal change in the detected value, and a turbidity determination unit that determines whether the detected value has a temporal change below a predetermined value. A determination function determines that the process is complete when the process is completed, and the average value of the memorized initial value and the detected value at the time of determining completion is determined, and the necessity of re-rinsing is determined by comparing the average value with a reference value. It has a judgment function. 11 is a drain valve, 12 is a drain valve control section, and +3 is a sequence control section. At the same time as the motor 8 rotates, the pulsator 4 rotates, so that the water 2 in the tank flows through the inner tank 3-outer tank 1 continuous pipe 5-conducting pipe 7-inner tank 3 as shown by the arrow in FIG. It circulates with the bottom 6-inner tank 3. FIG. 2 is a diagram representative of temporal changes in the detected turbidity value during the rinsing process, and point A is the detected turbidity value at the start of motor rotation. In the case of the rinsing process, the foam and detergent residue that cannot be completely drained out during the intermediate dehydration and accumulates at the bottom.
The turbidity at point A is high. When the motor rotates and the water in the tank begins to circulate, the concentration of the metal bodies in the tank becomes uniform, so the detected turbidity value decreases. In the rinsing process, the detergent contained in the cloth begins to precipitate, so the turbidity stops decreasing and instead increases. The point of the boundary (point B)
The detected turbidity value is stored in the turbidity determination section as an initial value. Even if the turbidity is increasing, if the residual detergent in the cloth is precipitated, the change in turbidity becomes very small and becomes saturated.

When the temporal increase in turbidity becomes less than or equal to a certain predetermined value, the turbidity determination unit determines that the process is complete (point C).

FIG. 3 is a rinsing control flowchart, and the control will be explained below.

Now, when the first rinsing is started, first, the initial value is detected, and then it is determined whether the temporal change in turbidity is less than a predetermined value, and when the temporal change is less than the predetermined value, the rinsing is started. The end is determined, and the turbidity at this time is detected as the end value. Next, calculate the average value of the initial value and the final value, and calculate the average value and the reference value V.
When the average value is smaller than the reference value v1, it is determined that re-rinsing is not necessary, and the process moves to the next step, such as a dehydration step. When the average value is larger than the reference value v1, it is determined that rinsing is necessary again, and a second rinsing is performed.

The second rinsing is performed in the same way as the first rinsing, and the initial value is detected, the rinsing completion judgment, and the end value are detected in this order.Then, the average value of the initial value and the end value is calculated, and the average value is calculated. The necessity of re-rinsing is determined by comparing with the reference value (■2). Here, when it is determined that rinsing is necessary again, a third rinsing is performed.

The third rinse ends when the temporal change in turbidity becomes equal to or less than a predetermined value, and the process proceeds to the next step, for example, a dehydration step.

Next, the reference value v1. V2 will be explained according to FIGS. 4 to 8.

Now, if the relationship between the first reference value v1 and the second reference value v2 is set to be Vl>V2, then the first reference value v1
is large, so even if the average value between the initial value and the final value after the first rinse is quite large and requires two rinses, there is a risk that the laundry will be rinsed only once.
Furthermore, since the second reference value v2 is small, there is a risk that the third rinse will be performed even though the average value has become considerably smaller after the second rinse. That is,
As shown in Figure 4, laundry that only needs to be rinsed twice may be rinsed once, resulting in insufficient rinsing, or may be rinsed three times, resulting in over-rinsing.

Also, if the relationship v1=v2 is set and both values are set to large values, insufficient rinsing will occur as shown in Figure 5, and conversely, if both values are set to small values, over-rinsing will occur as shown in Figure 6. , and further, when both are set to intermediate values, as shown in FIG. 7, under-rinsing and over-rinsing decrease, but they still occur.

However, in the present invention, by setting the relationship between the first reference value v1 and the second reference value 2 to be Vl<V2, under-rinsing and over-rinsing can be prevented as shown in Figure 8. I have to.

(Effects) As described above, according to the control method of the present invention, it is possible to eliminate cloth damage due to insufficient rinsing or over-rinsing, as well as waste of water, electricity, and time, and to perform optimal rinsing.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the control system of the washing machine according to the embodiment of the present invention, FIG. 2 is a diagram representatively showing temporal changes in the detected turbidity value, FIG. FIG. 4 to FIG. 8 are diagrams for explaining the relationship between the type of laundry, the actual number of times of rinsing, and the reference value. 6: Detector, 8: Motor, lO: Turbidity determining unit. Agent Patent attorney Aihiko Fukushi (and 2 others) 2'-do
Figure 2 3r2 4 Figure 185 Figure 6

Claims (1)

[Claims] 1. A detector that detects the turbidity of the liquid in the tank, and a rinsing completion determining means that detects the temporal change in the turbidity detected by the detector and determines the end of rinsing when the change falls below a predetermined value. The average value of the turbidity detected by the detector at the beginning of rinsing and the turbidity detected at the time of rinsing completion determination by the rinsing completion determination means is taken, and the need for re-rinsing is determined by comparing the average value with a reference value. and a re-rinsing determination means,
In the case where rinsing is repeated at least three times at most, the first reference value V_1 and the second reference value V_
1. A method for controlling rinsing in a washing machine, characterized in that the relationship between V_1 and V_2 is set to satisfy the relationship V_1<V_2.