JP2869175B2 - Inspection method for the control unit of home appliances such as washing machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for inspecting a control unit of a household electric appliance such as a washing machine.

[Conventional technology]

A washing machine is an example of a home electric appliance in which an operation control device using a microcomputer or the like is incorporated in a control unit.

FIG. 5 shows an example of a stirring type fully automatic one-tank type washing machine in this washing machine. A water receiving tank (not shown) is disposed in an outer box (20), and the water receiving tank is further placed in the water receiving tank. A washing and dewatering tub (23) provided with a stirring blade (24) is disposed on the motor (11) (not shown) via a drive shaft. 5 (not shown in FIG. 5).

An operation switch (6) (not shown in FIG. 5) for operation and a light emitting diode (LED) lamp (5) as a display element for displaying a water level, a course, and the like are provided on the upper surface of the outer box (20).
a) An operation panel (22) provided with a display and the like using (5b) (also not shown in FIG. 5) is provided, and a top opening of the washing and dewatering tub (23) is provided with a lid (21). Covered.

In the figure, (25) is a drain hose, (26) is a power cord, (2
7) indicates a ground wire.

FIG. 6 is a control circuit diagram of the washing machine. A drive circuit of a motor (11), a water supply valve (12), and a torque motor (13) for controlling a drain valve are connected in parallel to a power supply (10) of AC100V. However, a control device (1) using a microcomputer is connected to the same power supply (10) via a constant voltage power supply circuit (14).

(9) in the figure is an AC clock circuit provided between the constant voltage power supply circuit (14) and the control device (1).

An oscillation circuit (2) is connected to an input terminal of the control device (1).
A clock oscillation circuit (3), a reset circuit (4), an operation switch (6) provided on an operation panel (22), a motor circuit detection circuit (7) having a speed generator, and opening / closing of a lid (21) are detected. The lid switch (8) and the water level sensor (15) are connected.

On the other hand, the output terminal of the control device (1) has a
The LED (light emitting diode) lamp (5b) and other LED lamps (5a) are connected via the driving IC circuits (17) and (18), and other external component drive circuits (16) are connected. .

Thus, LED (light emitting diode) lamp (5a)
The display and the motor (11) by (5b) are operated by the output of the control device (1) by the input from the operation switch (6), and the control device (1) controls whether or not these operate correctly. Inspection is performed after assembling the device (1).

As such an inspection method, conventionally, the control device (1) is operated by the same program as in a normal washing operation to supply water,
Operate all processes such as washing, draining, rinsing, draining and dehydrating, input circuit of operation switch (6) and LED lamp (5a)
It was inspected whether output circuits such as (5b) and motor (11) operate normally.

FIG. 7 is a flowchart showing an example of such an inspection.
In particular, LED lamps (5
a) (5b) and an operation switch (6) for lighting the LED lamps (5a) and (5b) to check whether the operation is normal. Next, according to this flowchart, a conventional inspection method is described. explain.

When the power is turned on, the operation of the washing machine starts in accordance with the normal operation program (step a), and the water supply valve (12) is started.
Is opened and water is supplied into the washing and dewatering tank (23). And
It is detected from the output from the water level sensor (15) that water has been supplied to the high water level, and the LED lamp 4 (5a) and the LED lamp 8 (5
If b) lights up, the output to LEDs 4 and 8 is determined to be normal (Step B).

Then, press the course select switch SW ₄ of the manipulation switch (6) once (step C), LED lamps 3 which displays a strong course powerful course is set as (5a) LED
When the lamp 8 (5a) is turned on (step d), it is determined that the switch SW4 and the output to the LEDs ₃ , 8 are normal.

Further pressing the course select switch SW ₄ (Suteppuho), when selecting a hand washing course, the LED lamp 2 to view the hand-washing course (5a) is If the LED lamp 8 and (5a) is lit (Suteppuhe), and the switch SW ₄ The output to LEDs 2 and 8 is determined to be normal.

Next, press the water level change switch SW ₆ (step),
LED lamp 4 (5a) that indicates that the water level has changed is LED lamp 7
If (5a) is lit (stepch), switch SW ₆ and L
The outputs to ED4 and ED7 are determined to be normal.

Next, when the reservation switch SW ₇ is pressed (stepping), and the LED lamp 12 (5a) for indicating the reservation is turned on (step nu), the output to the switch SW ₇ and the LED 12 is determined to be normal. Each operation switch (6) is sequentially pressed to check whether the switch input and the output to the LED lamp are normal.

Finally, press the off switch SW ₁₄ (steple) and press the LED
Lamp (5a) when off all (5b), the output relation to all of the LED lamp and switch SW ₁₄ (5a) (5b) is determined to be normal (Suteppuwa).

Then, the switch SW ₁ to SW at each step mentioned above
_{14 If} the LED lamps (5a) and (5b) corresponding to (6) did not light up, and if they did not turn off in step LED,
It judges that there is an abnormality in the output or switch input and displays it (step f).

[Problems to be solved by the invention]

This is the conventional test method for press the normal washing operation program various operation switches SW ₁ to SW ₁₄ in accordance with, the number of patterns of operating modes are numerous, also steering mistakes occur because the operation is complex It is easy and the inspection time is long.

Also, press the same switch many times in different operation modes,
In some cases, the same LED lamp was turned on many times, resulting in poor inspection efficiency.

Although some control devices have a time reduction mode for shortening the inspection time, there are still many operation modes, so that the effect of time reduction is not so much obtained.

SUMMARY OF THE INVENTION An object of the present invention is to solve the disadvantages of the conventional example, to turn on the display element by a program different from the normal operation mode, to shorten the inspection time, and to improve the reliability of the inspection of home appliances such as a washing machine. To provide an inspection method for the control unit.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a dynamic lighting type light emitting diode composed of a matrix circuit, a display circuit using a display element such as a liquid crystal, and a control device for controlling lighting of the display element of the display circuit. In the control unit of a household appliance such as a washing machine, an input circuit such as an operation key used when the household appliance is normally operated through the control device and the display circuit correspond to a program different from a normal operation, The gist of the present invention is to test the display elements by sequentially turning on and off the display elements formed of the matrix circuit in a diagonal line by a key input of the input circuit.

[Action]

According to the present invention, an operation key used during a normal driving operation is made to correspond to a dynamic lighting display element configured by a matrix circuit, but this correspondence is different from a normal driving operation via a control device. The correspondence is made by a program, and the light emitting diodes of the matrix circuit are sequentially turned on and off in a diagonal line by a key input.

As a result, the light emitting diode is turned on and off only once for the inspection, and the number of operation modes is reduced, so that the inspection time is reduced. Further, by turning on and off the light on the diagonal line, even if there is a short-circuited part in the same column, the defective part can be found without fail.

〔Example〕

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

FIG. 1 is a flowchart showing an operation of a control device showing an embodiment of a method of inspecting a control section of a home appliance such as a washing machine of the present invention, and FIG. 2 is a flowchart showing an inspection operation of the same. The home electric appliance is, for example, a stirring type fully automatic one-tank type washing machine described above with reference to FIG.

The control unit (1) using a microcomputer or the like is incorporated in the control unit, and the input from the operation switch (6) to the control unit (1) causes the operation of the control unit (1) to operate the LED lamps (5a) and (5b). Operate the display and motor (11).

As shown in FIG. 3, the display using the LED lamps (5a) and (5b) is composed of a matrix circuit composed of seven display element segments of, for example, 12 LED lamps (5a), and is dynamically lit. The dynamic lighting method is a lighting method in which the number of lights is generally large, and a display element is arranged at a cross point between the scan line and the data line to control the lighting. For example, in the case of scan line 4 and data line 8, 4 × 8 =
32 display elements can be controlled. The lighting control in this case is
Eight data lines on one scan line are turned on or off by data lines, and all display elements on the other scan lines are turned off. After a certain time, all display elements on the current scan line are turned off, and then the display elements on the next scan line are turned on or off. In this way, by controlling the display elements in order of eight cycles in four cycles and by setting the repetition cycle to normally 100 Hz or more, the display elements that are actually lit are lit for only 1/4 of the time,
It will be as if it is lit continuously. This is the dynamic lighting method.

FIG. 4 is a control circuit diagram. The basic configuration is the same as that of the conventional example already described with reference to FIG. 6, and the same reference numerals are assigned. However, in the present invention, in addition to the conventional configuration, a program for function test is provided. Function switch SW ₁₅ for selecting
Is provided as one of the operation switches (6), and a program for testing its function is set in the control device (1) in advance separately from a normal washing operation program.

Next, the control device (1) is operated by the inspection program.
A method for testing the function of the first embodiment will be described with reference to the flowcharts of FIGS.

When performing a function test instead of a normal washing operation, first, the function SW ₁₅ (6) is pressed (step yo), and then the power is turned on (step ta, step no).
In this case, if the power is turned on without pressing function SW ₁₅ (6) before the power is turned on (steps 1 and 2).
2), the program for the function inspection does not start, and the normal washing operation starts (step 3).

Next, apply 25 KHz without water to the input side of the water level sensor (15) (Step 4, Step 4), and do not press any of the switches SW ₁₁ , SW ₁₂ , and SW ₁₃ as they are. (Stepsaw, steps 5, 6, 7), all 12 L
If the ED lamps 1 to 12 (5a) remain off (steps, steps 5, 6, 7, 8), it is determined to be normal.

In this case, the switch SW _11, SW _12, SW ₁₃ on (6), and off, on the LED lamp 1 to 12 (5a), the relationship between the off set in advance as in the following table.

Next, press only switch SW ₁₁ (Stepne, Step
5,13,14) If only LED lamp 1 is lit (Stepner,
Step 15) is determined to be normal, it is determined Pressing the switch SW ₁₂ (step la, Step 5, 6, 10) if only the LED lamp 2, 5 lights (Suteppumu, and step 11) normal, the switch SW _11, Press SW ₁₂ simultaneously (Step,
Steps 5, 13, 17) If only LED lamps 3, 6, 9 are lit (Step No., Step 18), it is determined that the operation is normal, and switch SW
_If only ₁₃ is pressed (step o, steps 5, 6, 7) and the LED lamps 4, 7, 10 are lit (step h, step 9), it is determined to be normal, and switches SW ₁₁ and SW ₁₃ are simultaneously pressed (step h, Steps 5, 13, 14) If the LED lamps 8, 11 are lit (Step, Step 16), it is determined that the operation is normal and the switch SW
₁₂ and SW ₁₃ at the same time (Step 5, Step 5, 6, 1
0) when only the LED lamp 12 is lit (Suteppufu, step 12) similarly input relationship LED output and the switch SW _11, SW _12, SW ₁₃ is determined to be completely normal (step co).

Switch SW ₁₁ on the contrary, SW _12, when the SW ₁₃ is pressed in various combinations as described above, if the LED lamp 11-12 corresponding thereto does not light correctly, LED output or switch SW _11, SW ₁₂ , It is determined that there is an abnormality in SW _13, and an abnormality is displayed.

In this way, the normal course select switch during the operation of the display unit is constituted by a matrix circuit dynamics lighting system in the present invention, the set switch SW _11, SW _12, SW ₁₃ is used as an operation switch (6) of the water level changing switch By pressing together, 12 LED lamps 11-12 (5
a) is turned on and off in sequence. However, the lighting of these LED lamps 11 to 12 (5a) turns on only LED lamps 2 and 5 (5a) after turning on LED lamp 1 (5a), and then the LED Lamps 3, 6, 9
(5a) is lit, and then the LED lamps 4, 7, 10 (5a) are lit by diagonal lines of the matrix circuit.

The method of the present invention can be applied to a liquid crystal type display as long as the display is constituted by a matrix circuit of a dynamic lighting system.

〔The invention's effect〕

As described above, in the inspection of the dynamic lighting type light emitting diode composed of the matrix circuit, by turning on the diagonal line of the matrix circuit, it needs to be turned on and off once, and the normal driving operation is not necessary. Since it is not necessary to perform the inspection, the inspection time can be reduced.

In addition, the normal lighting and extinguishing control is performed by turning on and off the diagonal line of the LED lamp composed of a matrix circuit of the dynamic lighting system that is performed by vertical and horizontal lines, so that the solder bridge of the lead of the board etc. This makes it easy to detect a defective portion, for example, when there is a short-circuited portion in the same row, thereby improving the inspection accuracy and accuracy.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an operation of a control device showing an embodiment of an inspection method of a control unit of a home appliance such as a washing machine of the present invention, FIG. 2 is a flowchart showing an inspection operation of the same,
The figure is an explanatory view of a matrix circuit forming a display, FIG.
FIG. 5 is a control circuit diagram, FIG. 5 is a perspective view of a stirring type washing machine, and FIG.
FIG. 1 is a conventional control circuit diagram, and FIG. 7 is a flowchart showing a conventional example of an inspection method. (1) Control device (2) Oscillation circuit (3) Clock oscillation circuit (4) Reset circuit (5a) LED (light emitting diode) lamp (5b) Character display Light emitting diode lamp (6) Operation switch (7) Motor rotation detection circuit (8) Lid switch (9) AC clock circuit (10) 100V AC power supply (11) Motor (12) Water supply valve (13) Torque motor (14) Constant voltage power supply circuit (15) Water level sensor (16) External component drive circuit (17) (18) IC Circuit, (20) Outer box (21) Lid, (22) Operation panel (23) Washing and dewatering tub, (24) Stirrer blade (25) Drain hose, (26) ) Power cord (27) Earth wire

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirofumi Urabe 1-1-1 Yamate, Funabashi-shi, Chiba Japan Inside the Funabashi Mfg. Co., Ltd. (56) References JP-A-56-31793 (JP, A) Kaihei 2-8913 (JP, A)

Claims (1)

(57) [Claims] 1. A washing machine or the like provided with a display circuit including a display element such as a light emitting diode or a liquid crystal of a dynamic lighting system constituted by a matrix circuit, and a control device for controlling lighting of the display element of the display circuit. In the control unit of the home appliance, the input circuit and the display circuit by operation keys and the like used when the home appliance is normally operated via the control device, and the display circuit correspond to a different program from the normal operation,
The control unit of a household electrical appliance such as a washing machine characterized in that a display element configured by the matrix circuit is sequentially turned on and off in a diagonal line by a key input of the input circuit, and the display element is inspected by turning off the display element. Inspection methods.