KR970006590B1 - A water level perception mrthod of an washing machine - Google Patents

Abstract

As the operating signal of the washing procedure is inputted, a microcomputer controls the water supply part to apply the water supply into the water tank. When supply starts, the microcomputer senses the level of water supplied by the way of the first level sensing part. At this time, the microcomputer judges whether there is any change of the inductance of coils(L1, L2) caused by the movement from up to down, if any, judges that the sensing is completed. As a result of judgement, when it is not completed, the water supply is continued until the sensing is completed, and when completed, the microcomputer controls drive part, stopping the water supply.

Description

How to detect the water level of the washing machine

1 is a circuit diagram of a schematic washing machine water level detection device applied to the present invention.

2 is a flowchart of the water level detection method of the washing machine of the present invention.

* Explanation of symbols for main parts of the drawings

A: Micom B: Water Supply Unit

C) first level sensor d. Second level sensor

1: Core 1: Water level contact

The present invention relates to a water level detection method of a washing machine. In particular, when an abnormality occurs in a water level sensor that detects the level of water supplied to a water tank during washing, the washing machine is capable of washing the water level by mechanical operation. It relates to a water level detection method.

In general, the water level detection method of the washing machine is mainly detected by using an electronic water level sensor, in which the detection method has a coil inductance value of the oscillator which is integrated circuit by moving the core with air pressure by water flowing through the water pipe. However, the electronic water level sensor as described above is sometimes destroyed due to a defective circuit element or an external shock, and when the electronic water level sensor is destroyed, the water level detection is not possible at all, as well as a washing machine. Had the problem of not working.

Accordingly, an object of the present invention is to provide a convenience in using a washing machine by enabling the washing operation while detecting the water level by the focusing operation when the electronic water level sensor detects an abnormality or a malfunction in washing the water level during washing. .

In order to achieve the above object, the present invention provides a method for detecting water level during a washing operation, determining whether there is a change in the detected water level, and if there is a water level change in the water level sensor, Determining that it is operating normally, the washing operation while supplying the detected water level, if there is no water level number in the step, determining whether the water level contact is operating, and if the water level contact is not operating in the step continues When the water supply, the water level contact is characterized in that the step of washing.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram of a water level sensor of a washing machine according to the present invention, which is controlled by a predetermined program and outputs a controlled signal to a series of input laundry administration signals. When driven by a control signal of the water supply unit (B) for supplying water and the core (1) for detecting the water level supplied from the water supply unit (B) and input the detected water level signal to the microcomputer (A), resistance A first water level sensing section (C) consisting of (R3-R5), coils L1 (L2), capacitors C1 (C2), and inverters INV1-INV3, and the first water level sensing section (C) If the water level is not sensed at, the water level contact 2, which operates while sensing the water level, consists of a second water level sensing unit (d) consisting of a resistor (R1) (R2), transistor (TR1).

2 is a flow chart for the water level detection method applied to the present invention, when the washing operation signal is input, the water supply step 20 for supplying water and the water level for detecting the water level of the water supply state in the water supply step 20 Level detection step 22 to determine whether there is a change in the water level detected in the detection step 21, the water level detection step 21, and the water level sensor if there is a water level change as a result of the determination in the water level change determination step 22 The water level detection completion determination step 23 for determining whether the water is completed, the water supply stop step 24 for stopping the water supply if the water level is detected in the water level completion determination step 23, and the water supply stop step 24 If the water supply is stopped in the washing start step 25 to start the washing and the water level conversion determination step 22, it is determined whether there is no change in the water level and the water level contact is operating, and if the water level contact is not operating continuously rating And, if the water level contact was to operate the water level contact operation determination step 26 to start the washing.

Referring to the effects of the present invention made as described above are as follows.

First, when a series of washing administration operation signals preset to the microcomputer are input while the power is supplied to the washing machine, the water supply driving unit (b) is controlled by the microcomputer according to the washing operation signal input thereto. Watering will be.

When the water supply to the water tank is started, the microcomputer (a) goes to the water level sensing step 21 and starts to detect the water level supplied through the first water level sensing unit (c), and then the microcomputer (a) changes the water level. Going to the determination step 22, it is determined whether there is a change in the level of water detected through the first water level detecting unit (c), that is, the change in inductance of the coils L1 and L2 due to the shandong of the core 1, In this case, if there is a change in the detected water level, the microcomputer (a) determines that there is no abnormality in the first water level detecting unit (c), and goes to the water level detection completion step 23 to determine whether the water level detection is completed. If the water level detection is not completed, the microcomputer (a) goes to the water supply step 20 to supply water until the water level detection is completed, and if the water level detection is completed, the water supply is completed in the microcomputer (a). Go to the support step (24) will stop the water supply by controlling the water supply drive (B) to start the washing operation of the washing process with a series of wash steps to start (25).

On the other hand, if there is no change in the water level detected by the first water level detector (C) in the water level change determination step 22, the microcomputer (A) determines that an abnormality occurs in the first water level sensor (C). The microcomputer (a) goes to the water level contact operation judging step 26 to determine whether the water level contact 2 of the second water level sensing unit (D) is operating, and if the water level contact 2 is not operating, the micom In step (a), go to the water supply step 20 to control the water supply driving unit (b) to continue to supply water to the water tank, and if the water level contact point 2 is operated, the water supplied to the water tank from the microcomputer (a). It is determined that the water level is filled with a high water level, the microcomputer (a) goes to the washing start step 25 to perform a washing operation during a series of washing administrations.

As described above, in the present invention, when an error occurs in the water level sensor for detecting the level of water supplied during washing, the water level can sometimes be washed by continuously supplying water to a high level while detecting the level of the second water level detection contact point. Due to the abnormality of the sensor it is possible to eliminate the washing stops or can not be provided to the effect that can provide convenience to use the washing machine.

Claims (2)

A water level detection method of a washing machine, comprising: detecting a water level with respect to a water level supplied during a washing operation, determining whether the detected water level is changed in the step, and when the water level is changed in the step, the water level sensor operates normally. Performing washing operation while supplying water to the detected water level and determining that the water level contact operates if there is no water level change in the step, and continuously supplying water without the water level contact operating in the step. And, when the water level contact is operated, the water level detection method of the washing machine, characterized in that the step consisting of washing to the water level of the operating point. The method of claim 1, wherein the water level contact is configured to detect a high water level.