JPH0790078B2 - Washing machine controller - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine controller for supplying an optimum amount of water to a washing tub.

2. Description of the Related Art A conventional washing machine control device is provided with a water supply valve for supplying water to a washing tub and a water level sensor for detecting the water level in the washing tub, and the water supply valve is set at a water level set according to the output of the water level sensor. It controlled and stopped the water supply. That is, before the start of washing, put laundry such as clothes in the washing tub, and when the washing operation is started, the water supply starts in the washing tub through the water supply valve, and when the set water level is reached, the water supply is stopped and the washing is performed. A series of steps of rinsing and dehydration were continued.

Problems to be Solved by the Invention However, in the conventional configuration, when a large laundry that easily absorbs water, such as a blanket, is placed in the washing tub and water is supplied, the water level sensor detects the set water level and stops the water supply. However, since the laundry absorbs water during this agitation, the water level is lowered and the agitation of the laundry is deteriorated, resulting in a decrease in washing.

In view of the above problems, it is an object of the present invention to prevent a decrease in cleaning ability due to a decrease in water level.

Means for Solving the Problems In order to achieve the above object, the present invention provides a water level detecting means for detecting the water level in a washing tub supplied from a water supply valve, and a signal of the water level detecting means for inputting the water supply. A control means for controlling the valve is provided, and the control means, before starting the washing operation,
Measure the water supply time from the start of water supply to the washing tub until the rated water level is detected by the water level detection means, and based on this water supply time, set the replenishment water supply time to be performed after the lapse of a certain time after the start of washing operation. To do.

Operation According to the above configuration, when a large item such as a blanket is put into the washing tub, the amount of water that can be supplied into the washing tub is smaller than when ordinary clothes are put. In other words, a bulky large product occupies most of the volume in the washing tub, and the amount of water supply decreases. Using this principle, the bulky state of the cloth in the washing tub is estimated from the water supply time from the start of washing to reaching the rated water level, and if the water supply time is short, the water supply time for replenishing is set to be long because it is bulky. To do.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a control device of a fully automatic washing machine. In FIG. 1, an AC power source 1 includes a motor 2 having a condenser 3 connected between windings, a drainage solenoid 4, and a water supply valve (water supply solenoid) 5 via switching means 6a, 6b, 6c, 6d. Connected. The motor 2 is controlled by switching means 6a, 6b for forward / reverse rotation control, and at the time of dehydration, the drainage solenoid 4 which is linked with a brake clutch is driven by the switching means 60, and when the switching means 6a is driven, dehydration is started. The switching means 6d drives the water supply valve. The control circuit 7 is composed of a microcomputer, and inputs and outputs signals from a motor rotation detection circuit 8, a sensor input circuit 9 such as a cleaning sensor, and an operation display input circuit 10 including a key switch and a display unit. Further, the control circuit 7 has a water level changeover switch which is a water level detecting means.
11 are also connected.

The operation of the control device having the above configuration will be described with reference to FIG. That is, the user puts the laundry into the washing tub,
When the key switch of the operation display input circuit 10 is operated to start the water supply, the timer T starts and the control circuit 7 measures the water supply time t up to the rated water level h shown in FIG. Then, it is detected whether the water supply time t is the washing water supply time A ₁ , A ₂ , ... A _n divided and set in advance in the review stage. It is determined that the shorter the water supply time is, the more bulky the laundry is, that is, the laundry having a large water absorption amount, and the water supply time to be replenished is set longer according to the water absorption amount. After the water supply is stopped, the washing operation is started, but since the laundry is initially in the dry state, it is rotated in the water during the washing operation and quickly absorbs water. Especially in the case of blankets, the water supply is large, and the water level in the water tank is
It decreases to h ₀ . A certain time (t ₀ −t) after the start of washing operation
After the lapse of time, the washing operation is temporarily stopped, and the time t ₀₁ −t ₀ (t ₁₀ , t is predetermined according to the level of the washing water supply time detected earlier.
₂₀ , t ₃₀ , ...) Water is supplied, the water level in the water tank is set to h ₀₁ as shown in Fig. 2, water supply is stopped, and the washing operation is restarted. If the water supply time before the start of the washing operation is extremely long, it is determined that A _n is abnormal, and the operation display input circuit 10 notifies the abnormality.

As described above, it is possible to prevent a decrease in the water level due to the absorption of water in the laundry by supplying water after the start of the washing operation, and to prevent a decrease in cleaning.

In the present embodiment, the case of a fully automatic washing machine is shown, but even a two-tub type washing machine can be easily realized by controlling the water supply valve.

EFFECTS OF THE INVENTION As described above, according to the present invention, the water supply time up to the rated water level before the start of the washing operation is measured, and after a certain time has elapsed since the start of the washing operation (the water level absorbed by the laundry is lowered and the water level is stable. The washing performance can be prevented from lowering due to washing with the water level lowered by replenishing water according to the water supply time, setting the water level to a rated water level or a slightly higher water level, and washing again. Cloth damage can also be prevented. In addition, the user is not required to supply water during washing to raise the water level, which is very effective.
In particular, the effect is great when washing a blanket having a large water absorption amount.

[Brief description of drawings]

FIG. 1 is a block diagram of a washing machine control device according to an embodiment of the present invention, FIG. 2 is a diagram showing a relationship between water level in a washing tub and time in a washing process, and FIG. 3 is a flowchart showing control in the washing process. Is. 2 ... motor, 4 ... drainage solenoid, 5 ... water supply valve, 11 ... water level switch.

Claims (1)

[Claims] 1. A water level detecting means for detecting a water level in a washing tub supplied with water from a water supply valve, and a control means for inputting a signal from the water level detecting means to control the water supply valve. Before the start of operation, measure the water supply time from the start of water supply to the washing tub until the rated water level is detected by the water level detection means, and based on this water supply time, replenishment performed after a certain time has elapsed since the start of washing operation Washer control device to set the water supply time of.