KR19980017250A - How to check the water supply failure of the washing machine - Google Patents

Abstract

The present invention relates to a technology for checking a water supply abnormality of a washing machine, and more particularly, in a microcomputer control washing machine controlling the opening and closing of a water supply valve to supply washing water for a washing machine, by supplying washing water by opening a water valve and supplying the washing water to a washing tank. Determining whether the time has reached a specified time, and if the time reaches a predetermined time in the step, the water level data (from the water level sensor) H) is input and the specified time is supplied to the water supply time data ( Set to T), and using the data input in the step, H / And a step of comparing the speed displacement amount and the preset speed displacement amount obtained in the step, and simultaneously performing water supply interruption, error display, and alarm occurrence when it is determined to be equal to or less than the set speed displacement value. As a feature of the present invention, an abnormality in water supply can be detected at an early stage, thereby shortening the waste time required for washing.

Description

How to check the water supply failure of the washing machine

The present invention relates to a technology for checking a water supply failure of a washing machine, and more particularly, a water supply failure of a washing machine in which a water supply abnormality is detected using a speed, ie, a displacement amount, obtained from the water level and water supply time of the water supplied to the washing tank. It is about checking method.

In general, the washing machine is provided with a water supply abnormality alarm device in order to prepare for the water supply is not smooth, which is to alarm if the water supply does not reach the water level set in a certain time regardless of the water level after the start of the water supply. However, in general, the water level is different in the amount of water at the high and low water level, but if the alarm is generated by checking only a predetermined time in advance and ignoring this situation, the time for detecting water supply abnormality becomes longer. There has been an inherent problem of a long time spent on washing.

In the present invention, the microcomputer control washing machine to control the opening and closing of the water supply valve to supply the washing water of the washing machine, opening the water supply valve to supply the washing water to the washing tank, and determining whether the water supply time has reached a designated time; When the water level reaches a certain time in the step, the water level data ( H) is input and the specified time is supplied to the water supply time data ( Set to T), and using the data input in the step, H / And a step of comparing the speed displacement amount and the preset speed displacement amount obtained in the step, and simultaneously performing water supply interruption, error display, and alarm generation when it is determined to be equal to or less than the set speed displacement value. have.

1 is a control block diagram of devices employed in the present invention.

2 is a detailed circuit diagram illustrating an example of FIG. 1;

3 is a control flow chart of the water supply abnormality check method of the present invention washing machine,

Figure 4 is a graph showing the displacement amount of the washing machine of the present invention.

* Description of Signs of Main Parts

1: microcomputer 2: water level detection unit

3: water supply valve drive unit 4: alarm unit

5: display unit

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

1 is a control block diagram of the apparatus employed in the present invention, Figure 2 is a detailed circuit diagram showing an example of Figure 1, Figure 3 is a control flow diagram of the water supply failure check method of the washing machine of the present invention, Figure 4 is a displacement amount of the washing machine of the present invention This is a graph.

The apparatus employed in the present invention comprises a water level detecting unit 2, a water supply valve driving unit 3, a display unit 5, an alarm unit 4, and a microcomputer 1.

As shown in FIGS. 1 and 2, reference numeral 2 denotes a water level detection unit, which includes resistors R1-R5, capacitors C1, C2, and coils (2) as input ports PI1 of the microcomputer 1. L), inverters I1 (I2), and transistors Q1 are configured to generate natural frequencies in response to changes in the water level pressure (small, low, medium, high) in the washing tank. Numeral 3 denotes a water supply valve driver, which is composed of a resistor R6-R8, a transistor Q2, a triac T, a condenser C3, and a water supply valve V as an output port PO1 of the microcomputer 1. To supply water to the wash tub. (4) is an alarm unit, which is composed of resistors R9-R11, transistors Q3, and buzzer B as an output port PO2 of the microcomputer 1 to inform the outside as a buzzer alarm. Denoted at 5 is an error display means configured as an output port PO3 of the microcomputer 1 to display the water supply abnormality display.

(1) is a microcomputer, which is composed of a central processing unit (cpu), an input / output device, and a one-chip microcomputer consisting of a ROM and a RAM in which the driving program of the present invention is incorporated. The water level data of the water level detection unit is input to PI1, and the water supply valve driving unit 3, the alarm unit 4, and the display unit 5 are connected to the output ports PO1-PO3.

And, as shown in FIG. 3, the drive program of the microcomputer, in the microcomputer control washing machine to control the opening and closing of the water supply valve to supply the washing water of the washing machine, by supplying the washing water to the washing tank by opening the water supply valve, the water supply time Step (S1-S2) for determining whether the specified time has been reached, and the water level data (from the water level sensor) H) is input and the specified time is supplied to the water supply time data ( Using the step S3-S4 and the data input in the step S3-S4, H / Comparing the step S5 to the step S5, and comparing the speed displacement amount obtained in the step S5 with the preset speed displacement amount, when it is determined to be less than or equal to the set speed displacement value, the water supply stoppage, error display, and alarm generation are performed simultaneously. S6-S9) is provided, including.

Referring to the operation of the present invention configured as described above are as follows.

First, when power is supplied to the washing machine and the washing course is selected and the start switch is turned on, the microcomputer 1 outputs a low signal to the output port PO1 to turn on the transistor Q2 through the resistor R6. At the same time, the trigger signal is applied to the gate of the triac T so that the triac T is turned on, so that the power supply AC is applied to the water supply valve V to open the water supply valve V, and the water supply to the washing tank is started (S1). ). Subsequently, the microcomputer 1 checks a predetermined time set in advance (S2), and if the time is within the time, the water supply according to the step S1 is continued. Let's proceed.

Step S3 reads the signal input from the input port PI1 of the water level detection unit 2 to obtain the water level data, that is, the specific operation is the iron core of the pressure sensor coil L according to the water level pressure of the washing tank. Since the reactance value of the coil L is changed, the unique LC oscillation is performed by the changed values of the capacitors C1 and C2, and the oscillation signal passes through the transistor Q1 through the resistor R3. By turning on intermittently, the oscillation square wave is input to the input port PI1 of the microcomputer 1 through the resistor R5. In this way, the water level detecting unit 2 generates a constant natural frequency according to the water level in the washing tank and is input to the microcomputer 1 input port PI1 so that the microcomputer 1 reads the constant oscillation frequency to obtain the water level. H).

Step S4 is to set the water supply time identified in step S2 ( T) Select by time data of speed displacement.

Then, the water level data obtained in steps S3 and S4 ( H) and time data ( T) as shown in Figure 4, the expression ( H / Using T), the velocity displacement A is obtained.

This speed displacement A is compared with the reference speed displacement B optimally designed through the experiment at the microcomputer 1, and the result is that if the currently measured speed displacement is more than the reference speed displacement, the current water supply is determined to be normal and water supply is completed. On the other hand, if the currently measured speed displacement is less than the reference speed displacement, the controller determines that the current water supply is abnormal and immediately stops the water supply, displays an error, and generates an alarm (S9).

In step S9, the microcomputer 1 outputs a high signal to the output port PO1 to turn off the transistor Q2 through the resistor R6. At the same time, the trigger signal is not applied to the gate of the triac (T). Therefore, the triac (T) is not conducting and the power supply (AC) is cut off from the water supply valve (V). Is blocked. In step S9, the error display control outputs the water supply error signal through the output port PO3 of the microcomputer 1 to display an error code display for the water supply error, and the alarm control outputs a low signal to the output port PO3. The transistor Q3 is turned on through the resistor R8 so that the power supply Vcc flows to the emitter ground of the transistor Q4 through the buzzer B and the resistor R11, and the buzzer B emits an emergency alarm. .

As described above, the present invention not only has an advantage of shortening the wasting time required for washing by detecting the water supply abnormality early by using the speed displacement, and also displays an error at the same time so that the water supply abnormality can be easily confirmed from the outside. There are also features that trigger alarms and stop water supply.

The above description is only one embodiment of the present invention, and any change and modification can be made within the scope of the present invention.

The present invention compares the result of calculating the speed (displacement amount) of the water supplied to the washing tank during water supply and comparing the previously set speed (displacement amount) value to determine the water supply abnormality. The purpose is to provide a check method.

In addition, another object of the present invention is to issue a water supply stop, water supply error indication, and water supply alarm at the same time if water supply abnormality is found early.

Claims (1)

In the microcomputer control washing machine to control the opening and closing of the water supply valve to supply the washing water of the washing machine, the step of opening the water supply valve to supply the washing water to the washing tank, and determining whether the water supply time has reached a specified time, and in the step When a certain time is reached, the water level data from the water level detection unit ( H) is input and the specified time is supplied to the water supply time data ( Set to T), and using the data input in the step, H / Comprising a step of obtaining T), and comparing the speed displacement obtained in the above step and the predetermined speed displacement amount, and when it turns out to be below the set speed displacement value, the water supply abnormality check is provided. Way.