JPS63318996A - Water level 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 Field of the Invention The present invention relates to a water level control device used in a washing machine.

BACKGROUND OF THE INVENTION In recent years, it has become mainstream to use microcomputers to control washing machines, and along with this, some washing machines also use microcomputers to control the water level. Here, as a method for converting water level analog data into digital data, a method that converts it into frequency data is often used.

Problems to be Solved by the Invention Conventionally, in the method of digitally controlling the water level by converting this water level data into frequency data, it is difficult to detect a failure in the water level detection path 1 frequency conversion path, water supply valve, etc. I wasn't supposed to do that.

The present invention provides such a water level detection path 1 frequency conversion path,
The overall purpose is to detect all abnormal conditions at an early stage in the event of a failure of a water supply valve, etc., and to notify the user of the abnormality using a display or buzzer.

Means for Solving the Problems In order to achieve the above object, the present invention, as shown in FIG.
A water level detection means 1, a water level data frequency conversion means 2 which takes this as an input and converts the water level data into a frequency, an abnormal frequency determination means 3 which determines from this frequency data whether or not it is an abnormal frequency, and this data and the water level It is configured to include a control means 7 that receives data from the data frequency conversion means 2 as input and controls a water supply valve 4, display means 6, and buzzer 6 as output.

Function Generally, the relationship between water level and frequency is as shown in Figure 4. The maximum and minimum values of the water level are determined by the size of the washing tub, and therefore the maximum value of the frequency = fT11tLX, and the minimum value = fmin. It is determined as a constant value. In the block diagram of FIG. 3, water level detection means 1
, the water level data frequency conversion means 2, and the water supply valve 4, the abnormal frequency determination means 3 compares the input frequency data with the fmax and fmin to determine whether or not there is an abnormality. Based on this information, the control means 7 turns off the water supply valve 4 and uses the display means 6 or the buzzer 5 to notify the user of the abnormality.

Embodiment FIG. 1 is a circuit diagram showing a specific configuration of an embodiment of the present invention. In FIG. 1, reference numeral 9 denotes a bidirectional thyristor, which is used to drive the water supply valve 4.

A resistor 10 connected to the bidirectional thyristor 9 limits this gate current. Reference numeral 1 denotes a water level detection means, which detects the water level in all the stages in the washing tub. Reference numeral 2 denotes water level data frequency converting means for converting the water level data of the water level detecting means 1 into full frequencies. Reference numeral 8 designates a microcomputer, which internally includes an input section 8a for inputting water level data frequency conversion means 2ft, a water supply valve 4, a display means 6, an output section 8b for outputting an output signal to the buzzer 5, and a storage section for storing the frequency data of the water level. Based on the data of the 8C1 input section 8a, the output section 8b
It has an arithmetic control section 8d that outputs a control signal to. Note 1
1 is an AC commercial power source.

Next, the operation of this embodiment will be explained. FIG. 2 shows the main part of a flowchart controlled by the microcomputer 8.

That is, when entering the water supply process, the microcomputer 8
In step 2Q, the water supply valve 4 is driven. Next, in step 21, the current water level data is converted into frequency data f
Enter N.

Here, let fmin and fmax be data obtained by converting the minimum and maximum water level data that the washing tub can take from empty to full, respectively, into frequencies, then the microcomputer 8 determines in step 22 that fN is fm
in (fs < fmax 't" is satisfied, fs <j'min or f or > fm
If the frequency is a, the frequency is determined to be abnormal in step 26, and a counter Q7i is counted up to measure the number of times the frequency has been determined. Furthermore, in step 27, this person's output value is 1.
It is determined whether the number of times is 0 or more. If it is less than 10 times, the process returns to step 20, and if it is 10 times or more, the process proceeds to step 28. Here, since the abnormal frequency data has been input ten times in a row, the microcomputer 8 detects that an abnormality has occurred in the water level control system, and turns off the water supply valve. Furthermore, in step 29, this abnormal state is notified or displayed. Returning to step 22, the microcomputer 8 determines that fmin < f
If it is determined that H< 1m2Lz is satisfied,
In step 23, the abnormal frequency discrimination frequency counter is cleared. Furthermore, in step 24, it is determined whether fx ) fH is satisfied, assuming that the frequency data of the set water level is fx.

Here, if f engineering>9, the microcomputer 8 is
It is determined that the set water level is currently reached, and step 25
Turn off the water supply valve L and proceed to the next step.

If fx<f,I, return to step 2o and repeat the following operations.

According to the above embodiment, in the water level control system using the water level detection means and the water level data frequency conversion means, by providing the abnormal frequency determination means, it is possible to detect an abnormality in the water level control system from 10 consecutive inputs of the abnormal frequency. Can be identified early.

Effects of the Invention As is clear from the above embodiments, the present invention includes a water level detection means for detecting the water level in a washing tub in multiple stages, and a water level data system that uses the water level detection means as an input and converts the water level data into frequency data. An abnormality determining means receives the frequency converting means and the water level data frequency converting means as inputs and determines whether the converted frequency is abnormal; and an abnormality determining means receives the water level data frequency converting means and the abnormality determining means as inputs; By providing a control means for controlling the display means, if there is an abnormality in the water supply control system, the abnormality can be determined early from the data of the abnormality determination means, the water supply 9f is completely stopped, and a buzzer or display means is used to detect the abnormality. Therefore, it is possible to provide an excellent water level control device that can notify the user of abnormal conditions.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a water level control device for a washing machine according to an embodiment of the present invention, FIG. 2 is a flowchart of the main parts, and FIG.
The figure is a block diagram of the water level control device, and FIG. 4 is a graph showing the relationship between water level and frequency. 1...Water level detection means, 2...Water level data frequency conversion means, 3...Abnormal frequency discrimination means, 4...Water supply valve, 6... ...Buzzer, 6.
...Display means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3, 9 Figure 4 1 inch;

Claims (1)

[Claims] water level detection means for detecting the water level in a washing tub in multiple stages; water level data frequency conversion means for converting water level data into frequency data using the water level detection means as an input; Abnormal frequency determining means for determining whether the converted frequency is abnormal; and control means for receiving the water level data frequency converting means and the abnormal frequency determining means as inputs and controlling a water supply valve, display means, and buzzer as outputs. A washing machine water level control device characterized by: