KR900004856B1 - Washing machine checking method and apparatus - Google Patents

Abstract

Test program is executed when three test keys (TS1-TS3) are pushed at the same time and checks buzzer (BZ), motors (SM, TM), and valves (GB,VB). The program includes delay routine to prevent chattering. Two different beep sounds are set at start and end of test routine for discriminating function routine and test routine.

Description

Method and device for checking the failure of the washing machine

1 is a circuit diagram of the present invention.

2 is a drive program chart of the present invention.

3 is a failure check test program chart of the present invention.

* Explanation of symbols for main parts of the drawings

1: microprocessor 2: power circuit and peripheral circuit

3: drive and display section 4: buffer section

5: key operation part 6: warning part

TC ₁ -TC ₄ : Triac LD ₁ -LD ₄ : Light Emitting Diode

S ₄ -S ₈ : key TS ₁ -TS ₃ : test key

I ₁ -I ₅ : Buffer SM: Washing Motor

TM: Dewatering Motor GB: Water Supply Valve

VB: Drain Valve

The present invention relates to a failure checking method and apparatus of a washing machine.

It was very inconvenient during mass production process and after service because it takes a lot of time to find the cause of the defect during inspection by the driving part and the circuit abnormality in the washing machine.

Therefore, in the related art, a separate jig was manufactured to reduce the mass production process and after-sales service time, but since the circuit boards were different for each model, there was a disadvantage in that each jig for each circuit board had to be manufactured. .

An object of the present invention is to determine whether or not to perform a test program according to whether a key is input by supplying power while pressing a plurality of keys in a power-off state by using software and hardware of a microprocessor. It is intended to provide a method and a device that can easily determine the fault location of each drive part by sequentially operating the drive parts of the display. This purpose is to generate an input during the failure test when three test keys are pressed simultaneously. The LED display unit is configured between the key operation unit and the triac and the buffer unit connected to each driving unit, and the LED display unit is configured to blink each LED corresponding to the failure point during the failure test. It is.

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

FIG. 1 is a circuit diagram of the present invention, in which a microprocessor 1 having a power supply circuit and a peripheral circuit 2 is connected to an alarm unit 6 including a buffer I ₅ and a buzzer BZ. The driving and display unit 3 is configured to be connected to the ports PA _{1 to} PA ₄ through the buffer unit _{4 including the} buffers I _{1 to} I _{4. The} driving and display unit 3 is a washing motor SM. The triac (TC ₁ -TC ₄ ) is connected to the dehydration motor (TM), the water supply valve (GB) and the drain valve (VB), respectively, and the light emitting diodes (LD ₁ -LD ₄ ) are connected through the resistors (R ₅ -R ₈ ). ) to be connected to the anode side and the triac (TC ₁ -TC ₄ side of the gate) thereby configured to be via the resistor (R ₁ -R ₄₎ connected cheukga cathode of the light emitting diode (LD ₁ -LD _4).

Here the buffers I ₁ -I ₅ are for the inverter.

Then, the ports PB ₁ -PB ₂ of the microprocessor are connected to the test keys TS ₁ -TS ₃ and the keys S ₅ -S ₈ through the diodes D ₁ -D ₂ , and then the resistors R ₈ -R ₁₂ ) the key processor 5 is configured to connect the microprocessor 1 to the input ports PC _{1 to} PC ₄ .

FIG. 2 is a drive program chart of the present invention, in which a delay time is provided depending on whether the test keys TS ₁ -TS ₃ of the key control unit 5 are pressed at the same time to prevent chattering, and then initial driving of the test program and the general washing machine. Fig. 3 shows a flow chart for checking a buzzer, a washing motor, a dehydration motor, a water supply valve, a drain valve, and a buzzer as a failure check test program chart of the present invention.

In the present invention configured as described above, the circuit diagram of the present invention shown in FIG. 1 shows the key operation unit 5, the driving and display unit 3, and the warning unit 6. First, the operation principle of the key operation unit 5 is as follows.

In determining whether there is a key input for performing a failure test at power supply, performing a test program with only one key input may cause a malfunction in an undesired state.

Therefore, in order to prevent the test key from being operated due to sub-circumference, the present invention configures three test keys TS _{1 to} TS ₃ to perform a test when three test keys are pressed at the same time. In the power-off state in which the valve is not driven, the test program of FIG. 3 is performed only when the power is supplied while pressing the three test keys TS ₁ -TS ₃ .

That is, the detection of the input of the test key when performing a "start" routine that the power supply is supplied in a state in which operation of three test key as a second help first to signal the microprocessor "port PB H level output to the _second" When the test keys TS _{1 to} TS ₃ are all pressed and the test keys TS _{1 to} TS ₃ are pressed, the H level signals are simultaneously applied to the ports PC _{1 to} PC ₃ .

At this time, perform delay for preventing chatling to prevent malfunction due to chattering that occurs during key input, and then judge whether the input of ports PC _{1 to} PC ₃ is H level signal at the same time. When the H level signal is applied to the ports PC _1- PC ₃ , the L level signal is output from the port PB ₂ as the input of the test key, and the jump to the test program routine shown in FIG. 3 is performed. After delaying and checking the key input, if the ports (PC _1- PC ₃ ) are not in the H level state, the microprocessor 1 determines that the test state is not in the test state and outputs the L level signal to the port (PB ₂ ), and then powers on. After the jump to the initial state is driven in the same manner as a general washing machine is the initial function of the key input standby state, the washing process is selected by the input key to perform the washing function.

The fault check test program is performed as shown in FIG. 3, and the buzzer BZ is turned on and off every X seconds to be distinguished from the general washing function. (BEEP) The sound is repeated Z times. At this time, the H level signal is output to the port PD ₁ of the microprocessor ₁ , and the L level signal is supplied to the buzzer BZ through the buffer I ₅ to supply power (V). ₁ ) flows through the buzzer (BZ) to generate a beep sound.

After that, when the washing motor on routine is executed and the H level signal is output for the time (A second) set by the port PA ₁ of the microprocessor 1, the L level signal inverted in the buffer I ₁ is converted into a triac ( It applied to the gate of the TC _1), because the direct current power source (V ₁₎ through the gate of the triac (TC ₁₎ so flows to the ground of the buffer (I ₁₎ is turned on, the triac (TC _1).

At this time, when the triac is turned on, the DC power supply V ₁ is applied to the light emitting diode LD ₁ of the display unit, and flows into the resistor R ₅ and the light emitting diode LD ₁ , thereby illuminating that the circuit is in a normal state.

At this time, if the light emitting diode LD ₁ is turned on and the washing motor SM is not driven, the light flows to the resistor R ₅ and the light emitting diode LD ₁ , and thus the microprocessor 1 and the buffer I ₁ are in a normal state. And it can be seen that the triac (TC ₁ ) device is bad.

In addition, if both the washing motor SM and the light emitting diode LD ₁ do not operate, it is understood that an abnormality occurs in the buffer unit 4 and the microprocessor 1. You can easily check for failure by checking the output of the processor.

Then, the washing motor off routine is performed to cut off the power applied to the light emitting diode LD ₁ and the washing motor SM, thereby giving off time to prevent confusion caused by the inspector inspecting the display unit one by one.

When the dehydration motor (TM), the water supply valve (GB) and the drain valve (VB) are driven in this manner and checked for failures, the buzzer (BZ) is driven as in the beginning to indicate that the test program is finished. The initial driving state of the general washing machine is passed.

As described above, the present invention allows a plurality of test keys to be input at the same time when a function of a general washing machine and a failure check test program are executed depending on whether a test key is input, and a malfunction of the test key is normally pressed and a predetermined time when the test key is input. It is possible to prevent malfunction due to chattering by delaying, and beep sound is generated at the beginning and the end of the failure test program, so that it can be distinguished from the operation of the general washing machine. By sequentially driving the light emitting diodes to be turned on, it is possible to easily identify the failure point, which has the effect of greatly reducing the unnecessary time and labor during mass production process and after service of the washing machine.

Claims (5)

After selecting the initial state of the general washing machine and the test program routine according to the state in which the key of the key control unit 5 is pressed, the buzzer (BZ), the washing motor (SM), the dehydration motor (TM) and the water supply valve ( GB), drain valve (VB), buzzer (BZ) in order to check the fault of the washing machine to detect the fault. The washing machine according to claim 1, wherein the test key of the key control unit 5 performs a test program routine when three test keys TS _{1 to} TS ₃ are simultaneously pressed and includes a delay routine for preventing chattering. How to check failure. The method of claim 1, wherein a beep sound is set at the beginning and the end of the test program (Z times) (Y times) so that a function of a general washing machine and a failure test function are distinguished from each other. In a washing machine circuit in which a power supply circuit and a peripheral circuit (2), an alarm unit (6), and a key operation unit (5) are connected to a microprocessor (1), a key (S _4- S ₈ ) connected through a diode (D ₁ -D ₂ ). ) Connect the test key (TS ₁ -TS ₃ ) to the cathode side of the diode (D ₂ ), and then through the resistors (R ₉ -R ₁₁ ), the input port (PC _1- ) of the microprocessor (1). PC ₃ ) the failure check method of the washing machine configured to be connected to the drive and display unit (3) through a buffer unit (4) connected to the output port (PA ₁ -PA ₄ ). 5. The driving and display unit 3 of claim ₄ is configured to contact the triac TC ₁ -TC ₄ with the washing motor SM, the dehydration motor TM, the water supply valve GB, and the drain valve VB. The cathode side of the light emitting diodes LD _1- LD ₄ connected to the resistors R _5- R ₈ through the resistors R _1- R ₄ on the gate side is connected to the buffer part 4. Device for checking the failure of the washing machine.

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