JPH01148296A - Controller of washing machine - Google Patents

Abstract

PURPOSE: To secure stability by giving information of a fault at an early stage and preventing starting of a washing process at the time of a fault. CONSTITUTION: A power source of a controller 1, which is supplied separately from a power source switch 71, can operate a display device 2 even in the case of disconnecting the switch 71. The controller 1 stops water supply and turns of a transistor part 31 of a load driving device 3. Next, the controller 1 detects the terminal voltage of the bidirectional thyristor 33 of a feeding valve 5 by a fault detector 6 to judge whether a load driving device is already turned off or not. At the time of judging that it is not yet, the controller 1 drives the bidirectional thyristor 73 of a disconnecting device 7 to disconnect the switch 71. Then, the controller 1 displays 'FF1' on the display 2 and always forms the loop of FF1 to keep FF1 displayed though the switch 71 is turned again.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a washing machine control device that clarifies the nature of the failure when the washing machine malfunctions and further ensures safety in the event of failure.

2. Description of the Related Art Conventionally, a control device for a washing machine of this type has a configuration as shown in FIG. In other words, 1 is washing, rinsing,
This is a control device that controls a series of washing steps including dehydration, and 2 is a display device that displays the progress status of the washing steps. 3
is a load drive device that drives loads such as the motor 4 and water supply valve 5 of the washing machine. This load drive device 3 is composed of a transistor 31 that is turned on and off by the control device 1, and bidirectional thyristors 32 and 33 that turn on and off the motor 4 and the water supply valve 5, respectively, when the transistor 31 is turned on and off. . Reference numeral 6 denotes a failure detection device for detecting a failure of the load driving device 3, and when the control device 1 determines that the load driving device 3 has failed based on the failure detection device 6,
A power switch 7 connected to the motor 4 and the load of the water supply valve 5
A bidirectional thyristor 73 connected in series with a relay coil 72 is turned on to operate a cutoff device 7 that cuts off a power switch 71. 8 is an AC power supply.

In the above configuration, the control flow when the failure detection device 6 detects a failure in the motor 4 and shuts off the power switch 71 is shown in FIG. 4, and its operation will be explained. The control device 1 is
Dehydration during a series of washing steps is completed in step 9, and the motor is turned off in step 1o. Next, in step 11, the control device 1 determines whether the motor 4 is in the off or on state by detecting the terminal voltage of the bidirectional motor thyristor 32 using the failure detection device 6. Here, motor 4
is off, the terminal voltage of the bidirectional thyristor 32 is applied with AC power, and when the motor 4 is on, the terminal voltage is approximately Ov. . If the motor 4 is off, the process proceeds to step 12, and if the motor 4 is not off, it is determined that the load drive device 3 is out of order, and in step 13, the bidirectional thyristor 73 is turned on, and the power switch 71 is turned off. At the same time, the display on the display device 2 that displays the progress status of the washing process also disappears.

In addition, when the load drive device of the water supply valve 6 fails, the terminal voltage of the bidirectional thyristor 33 at the end of water supply is detected, and it is determined whether the bidirectional thyristor 33 is turned off at that time, Based on the determination, the same operation as described above is performed.

Problems to be Solved by the Invention In such a conventional configuration, when the load drive device 3 such as the motor 4 or the water supply valve 6 breaks down during the washing process, the power switch 1 is shut off and the display disappears. Therefore, the user could not determine whether the washing process had finished normally or not, and was able to turn on the power switch again and continue the washing process without noticing the failure of the washing machine immediately.
The problem was that safety could not be ensured.

The present invention is intended to solve these problems, and aims to ensure stability by notifying the user of a malfunction at an early stage and preventing the washing process from starting in the event of a malfunction. It is.

A foolproof way to solve problems In order to solve this problem, the present invention is designed to solve this problem.

A control device that controls a series of washing processes such as rinsing and dehydration;
a display device that displays the progress status of the washing process; a load drive device that drives a load such as a washing machine motor; a failure detection device that detects a failure of the load drive device; and a failure detection device that detects a failure of the load drive device. and a cutoff device that cuts off a power switch connected to the load when the device detects a failure, and the display device includes a cutoff device that cuts off the power switch connected to the load when the load driving device breaks down and the power switch is cut off by the cutoff device. An abnormality in the load driving device is displayed at the time, and the control device does not start the washing process even if the power switch is turned on again.

Function According to the above configuration, when the load drive device fails and the power switch is cut off, the abnormality is displayed and the washing process is not started even if the power switch is turned on again. In the event of a malfunction, notify the user of the malfunction,
This will ensure safety in the event of a failure.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, parts that are the same as those of the conventional component shown in FIG. 3 are given the same numbers, and their explanations will be omitted.

The power to the control device 1 shown in FIG. 1 is supplied separately from the power switch 71, and the display device 2 can be operated even when the power switch 71 is shut off.

Next, the control flow of the control device will be explained with reference to FIG.

In step 14, the control device 1 ends water supply and turns off the transistor section 31 of the load drive device 3. Next, in step 15, the control device 1.

The terminal voltage of the bidirectional thyristor 33 of the water supply valve 5 is detected by the failure detection device 6, it is determined whether the load drive device 31 is turned off, and if it is determined that the load drive device 31 is not turned off,
In step 16, the bidirectional thyristor 73 of the cutoff device 7 is driven to cut off the power switch 71. Then, in step 17, the control device 1 displays "FF1" on the display device 2.

Then, a loop of FF1 is always formed, and the power switch 7
Even if FF1 is input again, FF1 remains displayed.

Next, in step 16, the load drive device 31 of the water supply valve 6
If it is normal, the process proceeds to step 18, where the control device 1 drives the motor 4 for the next washing process, and after driving for a certain period of time, turns off the motor 4 in step 19. Here, the control device 1 detects the terminal voltage of the bidirectional thyristor 32 of the motor 4 using the fault removal device 6, determines whether the load drive device 31 can be turned off, and if it is determined that the load drive device 31 cannot be turned off. For example, in step 21, the bidirectional thyristor 73 of the cutoff device 7 is driven to cut off the power switch 71. Then, at 22, the control device 1 causes the display device 2 to display F F
2'' is displayed.The loop of FF2 is always formed, and even if the power switch 71 is turned on again, FF2 remains displayed.

Further, in step 2Q, the load drive device 31 of the motor 4
If it is normal, the process proceeds to step 23, the next step.

In this way, in this embodiment, when it is determined that each load of the washing machine is being driven when it should not be, the power switch 71 is turned off, and the display device 2 shows the following:
It is displayed in such a way that it is easy to determine which load has failed, and even if the power switch is turned on again, the display cannot be removed from the display, making it impossible to start the washing process, which improves serviceability. It is possible to improve performance and safety.

Effects of the Invention As is clear from the above embodiments, according to the present invention, when the load driving device fails and the power switch is cut off by the cutoff device, the abnormality of the load driving device is displayed and the power switch is turned on again. Since the washing process is not started even if the washing machine is loaded, the user can be notified of a malfunction at an early stage, and safety can be improved in the event of a malfunction.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a control device for a washing machine according to an embodiment of the present invention, FIG. 2 is a flowchart explaining the operation of FIG. 1,
FIG. 3 is a block diagram showing a conventional washing machine control device, and FIG. 4 is a flowchart explaining the operation of FIG. 3. 1...Control device, 2...Display device, 3
...Load drive device, 4...Motor, 5
... Water supply valve, 6 ... Failure detection device, 7
...... Cutting device, 8... AC power supply. Name of agent: Patent attorney Toshio Nakao et al. 16th
2 Figure 4

Claims (2)

[Claims] (1) A control device that controls a series of washing processes such as washing, rinsing, and spin-drying, a display device that displays the progress status of the washing process, a load drive device that drives a load such as a washing machine motor, and the load The display device includes a failure detection device that detects a failure of the drive device, and a cutoff device that shuts off a power switch connected to the load when the failure detection device detects that the load drive device has failed. When the load driving device fails and the power switch is cut off by the cutoff device, an abnormality of the load driving device is displayed, and the control device starts the washing process even if the power switch is turned on again. A washing machine control device configured to (2) The washing machine control device according to claim 1, wherein the display device changes the displayed content depending on the content of the failed load drive device.