KR910000837B1 - The method of detecting for washing objects - Google Patents

Abstract

The method compensates detected inertia of tank according to line voltage variation which causes variation of state torque of motor so that exact inertia corresponding to the amount of the wash is obtained water is filled to a certain level (H1) and rotating wing rotates one direction intermittently until water level reaches a certain leverl (H2) to get clothes wet uniformly. On time of the motor is set according to input voltage level, motor is drived for compensated on time and then count the rotation of motor during set off time.

Description

Washing amount detection control method of washing machine

1 is a circuit diagram of a control device of a washing machine to which the present invention is applied.

2 is a partial cross-sectional view of the washing machine.

3 shows another partial cutaway view of a washing machine.

4 is a flow chart of the laundry detection method according to the invention.

5 is a graph showing a relationship in which the inertia rotational speed of the motor corresponding to the washing amount is changed according to the potential of the input power voltage when the washing amount is sensed according to the conventional method.

6 is a graph showing the relationship between the washing amount and the inertia rotational speed of the motor according to the motor driving time when the potential level of the input power voltage is constant.

7 is a potential conversion timing diagram of a power supply voltage according to a state of a motor.

8 is a graph showing the relationship between the washing amount and the inertia rotational speed of the motor when detecting the washing amount according to the present invention.

* Explanation of symbols for main parts of the drawings

1: constant voltage circuit 2: shaping circuit

3: display part 4: function operation part

5: water level sensor part 6: driving part

7 input power voltage detection unit 8 rotation speed detection unit

IC1: Microcomputer IC2: Constant Voltage IC (Integrated Circuit)

IC3: Inverter IC 21: Drainage well

22: drain hose 23: reduction gear box

24: reduction gear rotary wing 25: belt

26: motor rotor blade 27: motor

28: magnet 29: reed switch

31: water supply hose 32: water supply well

33: rotor blade 34: washing tank

35: dehydration tank 36: laundry cloth

The present invention relates to a washing amount sensing control method of a washing machine, and more particularly, to a control method capable of accurately detecting a washing amount by obtaining a predetermined inertia rotational speed corresponding to the washing amount in a washing tank regardless of a change in an input line voltage.

In general, it is well known that in the use of a washing machine, it is effective to grasp the amount of laundry and control various functions according to the amount. This is because the amount of water or detergent is determined according to the size of the laundry, and when the amount of water or detergent is appropriate, the normal washing operation can be performed without damaging the laundry or the machine.

However, in the conventional washing machine, the method of determining the washing amount in the washing tank is to supply the water at a certain level, and then turn the motor on for a predetermined time and then turn it off again to determine the washing amount according to the rotational speed of the rotor blade at this time. The method was adopted. Inertia rotational speed means the rotational speed of the motor until it stops by inertia when the motor is turned on for a certain period of time. Input power is taken into account when the starting torque of the motor varies depending on the magnitude of the input voltage. If the potential of the voltage is assumed to be constant, the turn-on time of the motor is closely related to the inertia speed. That is, as shown in FIG. 6, when the input power supply voltage is constant, the longer the motor on time for the same amount of laundry X2, the greater the inertia rotation speed. (Y4 < Y5)

By the way, the conventional method for determining the amount of washing is to detect the water level in the washing tank by a predetermined level sensor without permission, and as shown in the partial cutaway sectional view of the washing machine shown in FIG. 2, the magnet 28 and the magnet mounted on the rotor blade 26 of the motor are shown. In order to determine the washing amount according to the inertia rotational speed of the rotor blade 33 by configuring the rotational speed detection unit so as to detect the rotational speed of the motor by the sensor 29, the change of the input power voltage is not considered and the turn-on of the motor And turn-off time were made constant. That is, as shown in FIG. 1 (the present invention can also be performed in this circuit, a detailed configuration will be described later). The reed switch 29 and the pull-down resistor R9 are connected to each other to rotate the motor in FIG. When the magnet 28 mounted on the 26 passes the upper surface of the reed switch 29, the reed switch 29 is opened and closed so that the microcomputer IC1 rotates to the seventh input terminal IN7 every time the motor 27 is rotated. A number sensing pulse was supplied to recognize the rotation speed of the motor 27. In this way, when the motor is turned on and off for a predetermined time regardless of the change in the input power voltage, the rotor blade 33 in the washing tank 34 rotates based on the inertia rotational force. . However, if the inertia rotation speed is detected by turning the motor on and off for a certain time without considering the change of the input power voltage Vin as described above, and the input power voltage Vin changes, the inertia rotation speed is also used for the same washing amount. There was a different problem. This problem stems from the fact that the power supplied to the home is not always constant even on the same day, and even though it differs from region to region, it is not taken into account.

When the amount of inertia rotation of the motor corresponding to the amount of washing is detected according to the conventional method, the rated input voltage and the rated input voltage X110% and the rated input voltage X90% may be supplied. For example, the case may have a shape similar to that of the graph of FIG. 5. That is, for the same amount of laundry X1, the inertia rotation speed of the motor 27 has a Y2 value at the rated input voltage, and a lower Y1 value at the rated input voltage X90%, and the rated input voltage X110%. In the case of the case of the rated input voltage has a higher Y3 value as the inertia rotational speed.

In addition to the above problems, the water absorption degree of the laundry when water is supplied at a certain level may vary depending on the location. It is a well-known fact that the laundry on the side of the water supply position has a slower water absorption rate than the laundry on the opposite side, and the laundry is biased on the opposite side of the lower side of the water supply side. It could be another cause.

Therefore, an object of the present invention is to detect the potential of the input power in the automatic washing machine to automatically adjust the on time of the motor appropriately and to detect the inertia rotational speed of the rotor blades when the motor off to respond to the washing amount irrespective of the variation of the input power voltage The present invention provides a laundry amount detection control method capable of detecting an accurate amount of washing by obtaining a constant inertia rotational speed.

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

1 is a circuit diagram of a control device of a washing machine in which the washing amount detection control method of the present invention is executed, and includes a voltage drop transformer T1, a full-wave rectifying diode BD1, a smoothing capacitor C1, C2, and a constant voltage IC IC2. A constant voltage circuit 1, two resistors R1 and R2, and a transistor Q1 are configured to display a sinusoidal waveform of the input power source Vin into a single-wave waveform and display various operating states of the washing machine. A display unit 3, a resistor R11, R12, R13, and a switch SW1-SW6, and a function operating unit 4 for inputting various function execution commands of the washing machine, an inverter IC (IC3), and a resistor. (R4, R15), temperature compensated thermistor (R16), capacitors (C5, C6) and inductance (L4), the inductance (L4) is variable according to the water level, the square wave signal having a constant frequency according to the variable value Water level sensor unit 5 for generating a, and a motor (M1) for driving the washing tank in accordance with the state of the input power voltage (Vin), A drive unit 6 composed of a drain drive solenoid L1, a feed water drive solenoid L2, and a resistor R3-R6, a triac TR1-TR4, and a motor start capacitor C4 to control such a drive body; , Rectifier diode (D1), resistor (R7, R8) with divided voltage potential, capacitor (C3) for obtaining smoothing potential, and switching diode (D2, D3) for bypassing overvoltage or surge voltage. The input power voltage sensing unit 7 generating a DC power waveform corresponding to the voltage, the reed switch 29 and the pull-down resistor R9 which are opened and closed according to the position of the magnet 28, and the number of rotations of the motor It consists of a microcomputer (IC1) programmed to control the overall function of the control device having a rotation speed detection unit (8) for detecting the number of input and output terminals (wherein reference numeral IN1-IN7 is a microcomputer input terminal and OUT1). -OUT10 is the output terminal and Vcc is the power supply terminal.)

FIG. 2 is a cross-sectional view of another partial cutaway of a washing machine for explaining the principle of detecting the inertia rotational speed of a motor, and FIG. 3 is a cross-sectional view of another partial cutaway of the washing machine for explaining the principle of detecting the amount of laundry. 4 is a flowchart of a washing amount sensing method according to the present invention, FIG. 7 is a timing diagram of power supply potential conversion according to a state of a motor, and FIG. 8 is a washing amount and an inertia rotational speed of a motor when the washing amount is detected according to the present invention. It is a graph showing the relationship with.

The present invention will be described in detail based on the above configuration. Various functions can be operated by a plurality of function operation switches SW1-SW6 of the function operation unit 4 of FIG. 1. When the operation switch of the switches is pressed, the microcomputer IC1 receives a key through the input terminals IN2-IN4. By scanning the input state, it recognizes this and controls the operation of each part of the system. First, as shown in FIG. 3, the microcomputer IC1 generates a drive signal in a logic " high " state to the output terminal OUT4 until the first stage switch H1 is reached, thereby switching the water supply control in the drive unit 6. As shown in FIG. Operate the device. That is, the fourth triac TR4 is turned on and the input power supply voltage Vin is supplied to the water supply driving solenoid L2. As a result, as shown in FIG. 3, the water supply valve 32 is opened to supply water. [This corresponds to step (4a) of FIG. 4]

At this time, the inductance (L4) in the water level sensor unit 5 is proportionally variable according to the water pressure, and according to the phase inversion amplifier IC (IC3), resistors (R14, R15) and capacitors (C5, C6) of the microcomputer (IC1) The oscillating square waveform corresponding to the water pressure is transmitted to the input terminal IN6. Therefore, the microcomputer IC1 reads this frequency to sense the current water level. [Equivalent to step (4b) of FIG. 4] This water level detection operation is repeated until the first level water level M1 is reached.

However, at the point of water supply up to the first stage water level (H1), as shown in FIG. 3, the laundry located on the lower side of the water well is sufficiently absorbed and descended to the bottom, and the opposite side is relatively stiffened or the amount of water absorption is low. There is a fear that the washing is generated, causing not only a large cause of the detection error when detecting the amount of laundry, but also the main cause of the twist of the laundry during washing. Therefore, in order to solve this problem, the rotor blade 33 is intermittently rotated in a predetermined direction from the first stage water level H1, and the entire laundry is wetted by re-watering to the second stage water level H2, which is an appropriate level for detecting the washing amount. It is possible to prevent the washing of the laundry cloth, and to sufficiently absorb the water of the laundry cloth so that the amount of washing can be accurately detected. This operation state is called a wetting operation for convenience of description. Herein, the wet operation state will be further described in detail. When the water level reaches the first level H1 in FIG. 3, the microcomputer IC1 drives the high state to the second output terminal OUT2 in FIG. 1. Generate a signal. As a result, the second triac TR2 is turned on so that the washing motor 27 is rotated forward clockwise, and the rotor blade 33 is rotated forward based on the belt 25. At this time, the turn-on time of the washing motor 27 is shorter than the turn-on time at the time of washing and the turn-off time is lengthened to reduce the twist of the laundry during the wet operation as much as possible. That is, the wetting operation is sufficient to fill the entire laundry cloth by supplying water until the water level reaches the second stage water level (H2) while the washing motor 27 continuously performs the operations of forward rotation → stop → forward rotation → stop. This is the operation process to make it wet. [This corresponds to step (4c) of FIG. 4]

As shown in FIG. 7A, the motor 27 is rotated forward while the second output terminal OUT2 of the microcomputer IC1 is "high" for a predetermined time t0-t2, and when the water level reaches H2, the second Switching the output terminal OUT2 to the low state turns off the water supply valve 32 and stops the motor 27 (the above steps correspond to (4d) → (4e) in FIG. 4). The potential of the input power source Vin is changed as shown in FIG. 7b. This is because the motor 27 does not rotate normally at the time t0 and after the predetermined time has elapsed even when the driving signal of the high state is generated from the second output terminal OUT2 of the microcomputer IC1 at the time t0. It can be started by RPM. Therefore, as shown in FIG. 7B, at the time t0, the potential rapidly descends and gradually increases with a gentle curve after a predetermined time delay, and then maintains a constant potential state when the motor 27 is fully started. . At this time, the delay time interval until reaching the time when the motor 27 is completely started varies depending on the amount of laundry, and the smaller the amount of laundry, the smaller the delay time interval since the motor can be driven to a normal state quickly. In addition, when the amount of laundry is large, the delay time interval is not only long, but increases substantially linearly until the predetermined potential level is reached after a predetermined time delay in a state where the potential is down, and the potential level is somewhat lower than when the amount of laundry is small.

The input power voltage Vin is applied to the input power detector 7 of FIG. The input power detection unit 7 obtains a direct current by half-wave rectifying the input power waveform based on the rectifying diode D1 and the smoothing capacitor C3, and applies the input power voltage based on voltage division resistors R7 and R8. The DC potential as shown in FIG. 7C is generated and transferred to the fifth input terminal IN5 of the microcomputer IC1, thereby making it possible to read the potential inside the microcomputer IC1 (above FIG. 4 (4f). )).

On the other hand, the potential of the fifth input terminal IN5 of the microcomputer IC1 may vary according to the excessive amount of washing. After a predetermined time has elapsed after turning on the motor (at time t1 in FIG. 7), as described above. Since the operation state of the motor 27 becomes constant, almost constant voltage can be transmitted to the fifth input terminal IN5 regardless of the excessive washing amount. Therefore, by reading the potential of the input power at the time t1, the washing amount sensing flow can be set in consideration of the voltage drop at the time of driving the motor 27. Here, the washing amount sensing water flow refers to turning on and turning off for the left and right rotation of the motor. The turn-on time of the motor 27 is changed when the input voltage is low in consideration of the principle of the graph of FIG. When the time is long and the input voltage is high, the on time is shortened to compensate for the error of inertia rotation of the motor due to the change of the input power voltage so that the washing amount can be detected more accurately. In addition, the reason why the motor off time is constant despite the change in the on time at the time of setting the water flow is to sum up the number of pulses generated during the predetermined time to take an average value. In conclusion, the motor turn-on time is varied according to the input power supply voltage, and the motor off time is made constant so that the conditions for generating the inertia rotation rate for the unit washing amount are the same.

On the other hand, by using the principle as shown in the graph of FIG. 6 described above, the equation for obtaining the motor turn-on time (T) during the water flow for detecting the washing amount with respect to the input power voltage Vin can be expressed as the following equation (*). Can be.

Where α denotes the turn-on time of the motor 27 when an input power supply voltage having a rated input voltage x 90% is supplied, Vin denotes an input power supply voltage, and β denotes (Vin-rated input voltage x 90%). It means an arbitrary constant value for converting the voltage value which is) into time.

Therefore, for example, assuming that the rated input voltage is 100 volts, the motor turn-on time of the rated input voltage x 90% is 1 second, and the β value is "0.01", the input voltage is 110 volts. * 1) 0.8 seconds based on equation.

In addition, when the input voltage Vin is 100 volts, the motor turn-on time is 0.9 seconds according to the following equation (* 2).

When the input voltage is 90 volts, the motor turn-on time is 1 second as is according to the following equation (* 3).

Therefore, the lowest potential is called the rated input voltage × 90, and the motor turn-on time is the longest at 1 second, and the higher the input potential is, the shorter the turn-on time of the motor is. You can compensate.

In this way, when the motor 27 is operated by selecting an appropriate water flow according to the input power voltage Vin (above 4g (4g)), the amount of laundry is detected according to the inertia rotational speed (RPM). 4 degrees (4h)], and the relationship with the amount of laundry according to the rotational inertia, as shown in Figure 8 RPM inertia for a certain amount of washing according to the input power supply voltage (Vin) The number is almost constant. However, if the amount of washing is very small, a slight difference may occur, but this is almost negligible in the conditions of use, and it is possible to detect the amount of washing with almost no error, and thus it is possible to select another optimal level for the amount of washing, thus reducing the waste of water. In addition to minimizing the washing machine with the ability to automatically dispense detergent according to the quantity used, it is possible to reduce the waste of detergent because the proper detergent can be added correctly. In addition, it is possible to select the level of the variable variable according to the washing amount without having to select the level of the level.

When the proper water level is selected through the above-described process, the water supply valve 32 is closed, water is opened until the water is filled in the proper water level, and when it is sensed that the proper water level is reached, the water supply valve 32 is closed and the fourth of the microcomputer IC1 is closed. With the output terminal OUT4 in the "low" state, the washing operation is performed for the selected washing time based on the selected water flow. [Equivalent to Figure 4 (4i) → (4m) step.] In addition, although omitted in the flow chart, the appropriate washing time may be selected and operated depending on the amount of washing. After the washing time elapses, the washing function is stopped (corresponding to the fourth step (4n) → (4o) step) to start the next operation (rinsing or stopping).

By performing the wetting operation as described above, it is possible to evenly absorb the laundry, thereby preventing the laundry from being biased toward one side, and thus, there is an advantage of eliminating a factor that causes one of the laundry detection errors.

In addition, by adjusting the motor driving time for detecting the washing amount in consideration of the change of the input power voltage, there is an advantage that the correct washing amount can be detected by compensating the inertia rotational generation error according to the difference of the input power voltage. In addition, it is possible to accurately detect the amount of laundry, it is possible to more accurately determine the amount of water and detergent input required for washing, there is an economic advantage.

Claims (2)

In the washing amount detection control method of the washing machine, the first water supply process for supplying water until the water in the washing tank reaches a predetermined first stage water level (H1), and when the water in the washing tank reaches the first water level (H1) The process of repeatedly rotating or stopping the rotary blade 33 of the lower portion of the washing tank until the water in the washing tank reaches a predetermined second stage water level H2 so as to uniformly wet the laundry and washing the laundry in the washing tank. When water reaches the second stage water level H2, the water supply is stopped and the washing motor 27 is rotated forward for the first predetermined time (t0-t2) to detect when the washing motor 27 enters the normal starting point. An input power voltage sensing process of setting a voltage as an input power voltage sensing value, and comparing the input power voltage sensing value with a preset rated input voltage value and, when the input power voltage sensing value is large, a corresponding motor on time value. Predetermined time is smaller than the motor on time value of the rated input voltage value, if it is smaller, the motor on time setting process is set by increasing the predetermined time, and the washing motor 27 is driven in a predetermined direction by the set motor on time, and then set in advance. Washing amount detection control method characterized in that it consists of a washing amount detection process for detecting the washing amount by counting the number of motor inertia rotation generated during the off time. The method of claim 1, wherein the setting of the motor on time satisfies the following equation. T = α- (Vin-rated input voltage × 90%) × β (α; motor turn-on time for rated input voltage x 90%, β; any constant for converting (Vin-rated input voltage x 90%) value into time, Vin; input power voltage).

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