KR970005275B1 - Clothing volume sensing apparatus of a washing machine - Google Patents

Abstract

The constant voltage of the constant voltage circuit(14) is fed to the hole sensor circuit(14B) of the constant voltage circuit(14A). The signal sensed by the hole sensor(13) is provided to the comparer(14B) which outputs a spherical pulse signal based on the result of the comparison. This signal is outputted in a spherical signal of the specific level to be reversed by the transistor(Q6) of the buffer(15), inputted to the microcomputer(16), having the microcomputer(16) counting the number of pulse inputted. The microcomputer(16) compares the number of the pulse counted with the preset standard pulse value, and judges the amount and determines the water level.

Description

Quantity detector of washing machine

The present invention rotates a multi-pole magnet with a washing motor shaft, converts the magnetic flux change of the magnet into an electrical signal using a Hall sensor, precisely segmenting and detecting the residual rotational speed of the washing motor, and detects the detected pulse number. Is appropriately compared with the reference values of the granular quantity detection, and the quantity is determined in multiple stages, and the water level corresponding to the determined quantity is divided into multiple stages, and the water level is executed while displaying the determined level. Apparatus and method for detecting the quantity of washing machine and determining and displaying the water level according to the detected quantity to improve the precision of the detection of the quantity of laundry, and to proceed with the washing by maintaining the appropriate level of the quantity of laundry The purpose is to provide.

1 is a circuit diagram of a conventional washing machine dose detection device.

2 is a waveform diagram of a conventional washing machine dose detection device.

3 is a flowchart of a conventional washing machine dose detection device.

4 is a circuit diagram of a dose detection and level determination and display device of the present invention.

Figure 5 is a waveform diagram of the detection signal at the time of detection of capacity in the apparatus of the present invention.

6 is a flowchart of a method for detecting a quantity of water and determining the water level in the device of the present invention.

7 is a graph showing the water level division of the apparatus of the present invention.

8 shows an example of the water level display of the apparatus of the present invention.

9 is a view showing another example of the water level display of the apparatus of the present invention.

10 is a view showing another example of the water level display of the apparatus of the present invention.

* Explanation of symbols for main parts of the drawings

11: washing motor 12: multi-pole magnet

13 Hall sensor 14 Hall sensor circuit

15: Buffer 16: Microcomputer

17: display means 18: motor drive unit

19: belt 20: clutch

21: washing wing 22: washing tank

4 is a view illustrating a configuration of a quantity detection and level determination and display device of the present invention which achieves the above object. Referring to FIG. A multi-pole magnet 12 which is rotated together with an axis of the washing motor 11 and divided into equal intervals, a Hall sensor 13 which detects a magnetic flux changed by the multi-pole magnet 12 as an electric signal, and the hall sensor A Hall sensor circuit 14 for converting the signal detected by (13) into a square wave pulse and outputting the same; a buffer 15 for supplying an output pulse signal of the Hall sensor circuit 14 to the microcomputer 16; The microcomputer 16 which counts the pulse input from (15), compares this count value with the reference value of the quantity determination, and controls the display in multiple stages, and the water level is subdivided and displayed under the control of the microcomputer 16. Display means 17, a motor drive unit 18 for driving the washing motor 11 under the control of the microcomputer 16, and a belt for transmitting the power of the washing motor 11 to the washing blade 21 ( 19 and a clutch to control the power transmitted from the belt 19 to the washing blade 21 ( 20), a washing blade 21 for stirring the laundry by receiving power through the clutch 20, and a washing tank 22 containing the laundry.

In the figure, 14A is a constant voltage circuit, 14B is a comparator, 17A is a water level display, 17B is a water level display, VCC is a power supply, R17 to R20 is a resistor, C5 is a capacitor, Q5, Q6 is a transistor, and D3 is a diode.

According to the present invention configured as described above, a process of detecting and determining a water level is performed as follows.

That is, the first and second steps of counting the number of pulses by receiving the residual rotational detection signal of the hall sensor detected for a predetermined time after the stoppage of the washing motor 11 left and right, and the number of pulses counted in the first step A second step of recognizing a quantity of water compared with a reference value of a set quantity determination; and a third step of determining the water level by comparing the number of pulses of the first step with reference values of the level determination in response to the quantity of quantity recognized in the second step And the fourth step of determining the granular water level by dividing the water level determined in the third step into n levels again.

6 and 7 determine the level of water in all seven levels, and when the determined level is subdivided into four levels again, detecting the quantity of washing machine and determining and displaying the level according to the detected quantity An example is shown.

The operation of the dose detection, the water level determination, and the water level display according to the present invention made as described above will be described with reference to FIGS.

First, as shown in FIGS. 4 and 6, the microcomputer 16 drives the washing motor 11 to the left and right reversely by controlling the motor driving unit 18 without supplying water into the washing tank 22. .

Since the power of the washing motor 11 is transmitted to the washing blade 21 through the belt 19 and the clutch 20, the washing blade 21 rotates the laundry in a dry state in which the water is not supplied with water.

At this time, the microcomputer 16 rotates the washing motor 11 intermittently as shown in (b) of FIG. 5, and turns off the washing motor 11 at any one time, and the motor 11 during this off section T1. While detecting the spread due to the remaining rotational force of the motor, the washing motor 11 is intermittently rotated to the right as shown in (b) of FIG. 5, and the washing motor 11 is turned off at any one point. Pulses due to the residual rotational force of the motor 11 are detected.

That is, when the washing motor 11 is rotated, the multi-pole magnetism 12 connected to the motor shaft is rotated together, and the change of the magnetic flux according to the rotation of the multi-pole magnetoque 12 is shown in FIG. It is detected by a change in the electrical signal as shown in (a), and the detected signal is converted into a square wave pulse signal by the hall sensor circuit 14.

The hall sensor circuit 14 operates by applying the constant voltage power of the constant voltage circuit 14A to the comparator 14B. The signal sensed by the hall sensor 13 is input to the comparator 14B, and the square wave pulse signal is output as a result of the comparison. The signal is output (waveform shaping), and this signal is output as a square wave pulse signal of a constant level through the constant current source transistor Q6.

The hall sensor 13 is an element that detects a change in the magnetic field by using a Hall Effect that converts the change in the magnetic field into an electric signal.

As described above, the square wave pulse signal output from the hall sensor circuit 14 is inverted by the transistor Q5 of the buffer 15 and then input to the microcomputer 16.

The microcomputer 16 counts the number of input pulses.

The pulse number input at this time is inversely proportional to the amount of water in the washing tank 22.

That is, when the quantity is large, the washing motor 11 is stopped in a short time, and when the quantity is small, the remaining rotation time of the washing motor 11 becomes long.

As such, the pulse detected by the hall sensor 13 becomes a pulse approximately proportional to the number of poles of the multipole magnetek 13 per revolution of the washing motor 11, and thus the residual rotational speed of the washing motor 11 is accurately observed. It is done.

Therefore, the number of input pulses per unit time counted by the microcomputer 16 can be converted into a frequency, which is counted as a number of pulses further subdivided than the number of pulses in the conventional counter electromotive force count.

The microcomputer 16 compares the number of counted pulses with preset reference pulse values, and determines a quantity of water, and determines the water level in accordance with the determined quantity of water.

FIG. 6 shows an embodiment of determining the dose and the water level in seven steps, and FIG. 7 shows an embodiment of further subdividing the amount and the water level of the seven steps into four steps (levels) for each step.

Referring to this, first, the water level is determined by dividing it into seven levels, and the seven levels are determined by one of the seven levels of high, medium, medium, low, low, small, and minimum in the level display unit 17A of the display means 17. The level is divided into four levels of -0, 0, 1, 2, and 3 again in the level display unit 17B.

First, the seven-level water level determination is made through the following process.

Referring to FIG. 6, the number of pulses currently input through the buffer 15 is counted, and the count value PPL (the pulse value per unit time is a frequency value) is used as the reference value P11 for minimum dose and water level determination. (Frequently, it is fg0 as shown in Fig. 7).

When the comparison result count value PPL is equal to or less than the reference value P11, the current quantity is determined to be the minimum quantity and the level is also determined to be the minimum level to turn on the corresponding LED of the water level display portion 17A of the display means 17.

In the case of the minimum water level as described above, four levels of granular determination are not performed.

When the count value PPL is greater than or equal to the minimum reference value P11 as a result of the comparison between the count value PPS and the minimum reference value P11, the reference value P1 of the decimal point determination is compared.

If the count value PPL is equal to or less than the decimal point reference value P1, the current amount is determined to be a small amount of water, and the water level is also determined to be a decimal point, thereby turning on the corresponding LED of the display unit 17A of the display means 17.

In this case, when a small amount of dose determination and a small number of determinations are made, the count value PPL is again compared with the reference values ff1, ff2, and ff3 divided into four levels from the decimal position as shown in FIG. -3, L-2 and L-1) are subdivided and determined.

The determined result is displayed on the water level level display section 17B of the display means 17, as shown in Fig. 8A, 0 level, -1 level as shown in (b), (c) and -2 level, and (d). As shown in the 4 levels of -3 levels, it is possible to display more detailed water level even in the low water level.

In this way, the microcomputer 16 compares the count value PPL with the reference values Pm1, Pm, Phm, and Ph in the remaining level determination, and determines the amount of water and determines the level.

Of course, even in the determination amount and the determined water level at each stage, the determination of the more detailed amount of water and water level is carried out as compared with the subdivided reference values fa1 to fe3 at each water level as shown in FIG. It is displayed in the format as shown in (a) to (d) of FIG.

9 shows another example of the display means 17 of the present invention, as long as the level is displayed in a normal amount (more, more, more, less than normal) without displaying the level in numbers. It is an example.

FIG. 10 shows another example of the display means 17 of the present invention, in which the level of the water level is commonly displayed on an indicator for displaying the remaining time of washing. In this case, the washing level is displayed numerically. Will be.

As described above, according to the present invention, in determining and displaying an appropriate water level by detecting a quantity of water in a washing machine, it is possible to determine the amount of water and the water level divided in multiple stages, and thus to perform washing by supplying water at a precise water level. Because of this, it is possible to prevent kinking due to excessive water supply or damage caused by excessive water supply.

In addition, since the residual rotation speed of the washing motor is accurately detected using the hall sensor, the detection accuracy of the quantity determination can be further increased, and the water level can be reduced by maintaining the optimum level.

(1) The technical field to which the invention belongs and the prior art in that field

The present invention relates to a device for sensing the amount of washing machine, and determines the appropriate level of washing with the detected amount of water, and displays the level of water, in particular, using a Hall sensor to count the pulse according to the residual counter electromotive force of the washing motor, this count The present invention relates to a quantity detection and water level display apparatus which can determine and display a quantity of washing in multiple stages using the determined values, and determine and display an appropriate washing level in multiple stages using the determined values.

In the conventional apparatus for detecting a quantity of washing machine, referring to FIG. 1, a microcomputer 1 for determining a quantity of water and displaying and controlling a water level, a display unit 2 for displaying the water level under the control of the microcomputer 1, and Transistors Q1 and Q2 and triac TR1 and TR2 for driving the washing motor 3 under the control of the microcomputer 1, the washing motor 3 driven by the triac, and the washing. A belt 4 for transmitting the power of the motor 3 to the washing blade 6, a clutch 5 for intermittently controlling the power transmitted from the belt 4 to the washing blade 6, and the clutch 5. The power transmission is controlled by the control unit, and the washing wing 6 for stirring the laundry and the washing water in the washing tank 7, the washing tank 7 containing the laundry, and the residual counter electromotive force of the washing motor 3 are detected and pulsed. An optical coupler PT1 and transistors Q3 and Q4 supplied to the microcomputer 1 in a waveform form.

In the drawings, R1 to R14 are resistors, C1 to C4 are capacitors, D1 and D2 are diodes, Vcc is a DC power supply, and AVC is an AC 110V / 220V power supply.

The amount of detection by the conventional amount detecting device configured as described above will be described with reference to FIGS. 1 to 3.

When the user selects the automatic washing course by using the key input unit, this command is inputted to the microcomputer 1 to select the quantity detection. When the quantity detection is selected, the microcomputer 1 controls the water supply valve so that the small amount in the washing tank 7 is selected. After the water is supplied, the transistors Q1 and Q2 and the triac TR1 and TR2 are driven to supply the power source AVC to the washing motor 3.

When power is supplied, the washing motor 3 is driven, and the power of the washing motor 3 is transmitted to the washing blade 6 through the belt 4 and the clutch 5, wherein the microcomputer 1 is the washing motor ( Rotate 3) forward and reverse about 10 to 30 times and stop driving.

As described above, from the time when the driving of the washing motor 3 is stopped, the washing machine 3 generates residual counter electromotive force in a waveform as shown in FIG. 2A, and the counter electromotive force is generated by the diodes D1 and D2. After the waveform of the period is removed, it is converted into a square and pulse signal as shown in (b) of FIG. 2 through the optical coupler PT1, and this signal is passed again through the transistors Q3 and Q4. Inverted and waveform-shaped as shown in the input to the microcomputer (1).

The number of pulses input to the microcomputer 1 is counted during the section T2 in which the washing motor 3 is turned off, and the number of the pulses is inversely proportional to the amount of laundry in the washing tank 7.

That is, in case of large quantity, since the frictional force of the washing blade 6 becomes large, the load on the washing motor 3 also increases, and the washing motor 3 will be stopped within a short time. Since the frictional force of 6) is small, the load on the washing motor 3 is also reduced so that the number of pulses generated due to the residual rotation of the washing motor 3 for a long time increases.

Therefore, the microcomputer 1 counts the number of pulses according to the residual rotation for the T2 time from the time when the washing mocker 3 is initially turned on for the first T1 seconds and then turned off. Determined by

The microcomputer 1 proceeds with water in accordance with the determined quantity of water. At this time, the water level is displayed on the display unit 2 in the level of high, medium, low, small amount, minimum amount, etc. in accordance with the result of the quantity determination.

As described above, in detecting a quantity of water and displaying a corresponding water level, a conventional quantity sensing device detects a quantity of water by repeatedly inverting the washing blade after supplying water to the minority level and repeating a plurality of times. This problem, and the accuracy is reduced because only the number of pulses due to the remaining motor rotation, the accuracy is lowered, and the problem that can not be determined by subdividing the water level according to the amount of laundry due to the decrease in accuracy, Due to the difficulty in supplying a suitable water level, there was a high possibility of occurrence of foam damage or kinking.

Claims (4)

Fully automatic including a laundry blade for rotating and stirring the laundry contained in the washing tank, a laundry motor for rotating the laundry blade, a power transmission mechanism for transmitting the power of the laundry motor to the laundry blade, and a control drive circuit for rotationally controlling the laundry motor. In the washing machine, the multi-pole magnet 12 is rotated together with the axis of the washing motor 11 and divided into equal intervals, and the Hall sensor 13 for detecting the magnetic flux changes by the multi-pole magnet neck 12 as an electric signal. And a Hall sensor circuit 14 for converting the signal detected by the Hall sensor 13 into a square wave pulse signal and outputting the same, and a buffer for supplying the output pulse signal of the Hall sensor circuit 14 to the microcomputer 16 ( 15) and the pulse inputted from the buffer 15 are counted, this count value is compared with the reference value of the quantity determination, and the quantity is divided into multiple stages to determine, and the water level corresponding to the determined quantity is subdivided. The microcomputer 16 and the microcomputer 16 poryang of the washing machine, characterized in that consisting of a display means 17 that the water level of detail display under the control of a sensing device which controls display in multiple stages. The water level display unit (17A) for displaying the washing water level divided into multiple stages, and the water level displayed on the water level display unit (17A) are further subdivided into multiple stages, and the water level is numbered. The quantity detection device of the washing machine, characterized in that consisting of a water level display unit (17B) to display. The quantity detection device of the washing machine according to claim 1, wherein the fraud display means (17) also serves as a remaining washing time indicator of the washing machine. The apparatus of claim 2, wherein the water level display unit (17B) subdivides the water level displayed on the water level display unit (17A) in multiple stages to display the water level level normally.