JPH05137692A - Controller for dish washer - Google Patents

Abstract

PURPOSE:To enable displaying and checking even afterward by storing abnormal contents even when a power source switch is cut off. CONSTITUTION:A controller 1 is provided which comprises a key input device 3 for setting drying time and operation courses and a microcomputer which performs a series of sequential operations. The controller detects abnormal contents during an operation from a sensor 4 and the contents are stored into a memory 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a dishwasher which performs a series of sequential operations of cleaning, rinsing and drying by a control device.

[0002]

2. Description of the Related Art In recent years, a dishwasher has come to perform a series of sequential operations of washing, rinsing and drying by a control device using a microcomputer.

Conventionally, as a control device for a washing machine, for example, as disclosed in Japanese Patent Publication No. 58-2716, when an abnormality occurs during the washing process, a plurality of contents for displaying the progress of the washing process are displayed as the contents of the abnormality. It was displayed by the combination of blinking of the indicator lights of the progress indicator consisting of the indicator lights. In particular, in the case of a dishwasher, it is necessary to promptly take countermeasures by displaying abnormality contents such as water supply abnormality, drainage abnormality, boiling water abnormality, overflow abnormality and the like.

[0004]

In such a conventional configuration, the user usually shuts off the power switch of the product in consideration of safety when an abnormal display occurs. The content of the error may be due to improper handling by the user or due to a product failure.In the former case, even if the power switch is turned off and then on again and restarted, an error will occur if proper use is performed. It is not a display. Even in the latter case, the content that does not cause an error display immediately after operation,
For example, there is a boiling water anomaly that does not reach a certain temperature even after a certain period of time, and the user as well as the service person cannot confirm what the anomaly display was afterwards. In most cases, it was treated as a control device failure because it could not be determined.

The present invention is intended to solve the above-mentioned conventional problems, and a first object of the present invention is to provide a dishwasher which stores and retains the abnormality content even when the power is cut off. A second object is to be able to confirm the details of this abnormality by performing key input in a predetermined order. Further, a third object is to erase the stored abnormality content by confirming the abnormality content and then performing the normal operation again.

[0006]

In order to achieve the first object, a control device for a dishwasher according to the present invention comprises a key input device for setting a drying time and a driving course, and a series of washing, rinsing and drying. A control device that performs a sequential operation, a display device that displays the progress thereof, a load drive device that is controlled by the control device, and a sensor that detects an abnormality content during operation and outputs the abnormality to the control device. The control device stores and retains the details of the abnormality even when the power switch is cut off.

Further, in order to achieve the second object, the control device displays the stored abnormality content on the display device by operating the key input device according to a preset order. Further, in order to achieve the third object, the control device is configured to erase the stored abnormality content when starting a series of sequential operations of cleaning, rinsing and drying after confirming the abnormality content.

[0008]

According to the above construction, since the content of the abnormality is stored when the abnormal state occurs, after the content of the abnormality is confirmed by the service person, the repair can be performed according to the content of the abnormality.

Further, after confirming the contents of the abnormality, the contents are erased only by starting the normal operation. Therefore, the display of the contents of the abnormality confirmed by the service person is highly reliable, and the second repair is required. Even if there is, it can be done efficiently.

[0010]

【Example】

(Embodiment 1) One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a microcomputer (hereinafter, referred to as a microcomputer) 1 which is a control device is preliminarily stored in a ROM of the microcomputer 1 according to a setting signal from a key input device and a signal from a sensor 4 such as a water level sensor or a thermistor. The load circuit 6 such as the water supply valve, the motor, and the drainage pump is driven via the load driving device 5 according to the procedure of the written program. The display device 2 is a display device that displays the progress of the sequential operation. Microcomputer 1
Usually has a memory called ROM and RAM inside, but the present invention has a non-volatile memory outside. Normally, the data in the RAM of the one-chip microcomputer disappears when the power is turned off, but in the present invention, the abnormality content data in the RAM is transferred to and stored in the nonvolatile raw memory.

Reference numeral 10 in FIG. 2 shows an operation display panel of the dishwasher. A progress indicator 2a, 2b, 2c for displaying the progress of a series of sequential operations of cleaning, rinsing and drying, a drying time indicator 2d, a driving course indicator 2e, and a drying time switch for operating the settings of the drying time indicator 2d. It comprises a key 3a, a driving course switching key 3b and a start / pause key 3c.

The control flow of the microcomputer having the above configuration will be described with reference to FIG. In step 21, the power plug is inserted into the outlet. When the power switch is turned on by step 22, the microcomputer 1 displays on the display device 2 and at the same time starts the input of the key input device 3. If the service check mode is not set in step 23, the process proceeds to step 24, and after the driving course is set by the driving course switching key 3b, the start / pause key 3c is pressed to start the driving. Next, when the water supply valve operates in step 25, if the time until the water level sensor outputs the water level detection signal is longer than the predetermined time, an indication of water supply abnormality is displayed on the display device 2.
The progress indicators for washing, rinsing, and drying were blinking, and indicators such as "strong" in the driving course were lit.
(The example is shown in FIG. 3) Usually, these lighting locations are classified according to the content of the abnormality, and for example, it takes more than a predetermined time to detect the water temperature in the cleaning process by a temperature detection device (such as a thermistor). In some cases, the "standard" indicator was lit, such as when there was an abnormality in boiling water. In step 27 (not shown), the content of the water supply abnormality is stored in a memory called RAM of the microcomputer, and the data is transferred to a non-volatile memory. In step 28, the power switch is turned off to eliminate the cause of the water supply abnormality, such as forgetting to open the tap of the water supply, and when the power switch is turned on again in step 22, normal operation is performed.

(Second Embodiment) It is assumed that the service check mode is set in step 23. This service check mode is different from the normal input method, for example, an operation of turning on the power switch while pressing the drying time switching key 3a. With these operations, the process proceeds from step 23 to step 29, and the microcomputer does , The content of the water supply abnormality stored in the non-volatile memory is displayed on the calling display device. When a service person requests repair from an abnormality, the service person can confirm a water supply abnormality caused by this service check. Therefore, it suffices to inspect whether it is due to forgetting to open the water tap or a malfunction of the water supply valve.

(Embodiment 3) When a service person once confirms the content by a service check when an abnormality is displayed and an abnormality is displayed, the content of the abnormality can be confirmed without error for the first time. However, in the case of an abnormality that does not accompany the abnormality display, for example, when an abnormal sound is generated from the product motor or the like, the user may
Although you will be asked to repair it for the second time, some servicemen will first check the details of the abnormality again by the same operation. However, if the contents of the previous abnormality are left as they are, it is expected that the abnormality will be determined to have occurred at the same time as this time, and will be replaced even if it is normal. Therefore, turn off the power switch in step 30,
The serviceman repairs the faulty part, step 31
Then, the power switch is turned on again, and when the operation is started in step 32, the microcomputer's R
The contents of the abnormal mode stored and held in the AM and the non-volatile memory are also erased. After that, the routine proceeds to step 25, and the normal operation is performed thereafter. Further, the erasure of the memory in step 33 may be performed after starting the operation a plurality of times on the assumption that the serviceman has made an operation error or the user has checked the service.

In the microcomputer 1, for example, when the power supply to the microcomputer is started by inserting a power plug, or if there is a non-volatile memory as long as there is a backup power source such as a battery, the abnormal mode is in the RAM of the microcomputer. Can be stored in memory.

[0016]

As is apparent from the embodiments described above, the abnormal content can be stored when an abnormal state occurs, and the abnormal content that occurred in the past can be easily recalled by an unusual input operation.

Further, since the contents are erased only by starting the normal operation after confirming the abnormality contents by the service person, even if the service person comes again for repair, the service person is confused by the previous abnormality contents. The content of this abnormality can be reliably judged without incident, and repairs can be performed without waste.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a dishwasher / dryer showing an embodiment of the present invention.

[Figure 2] Front view of the operation display panel of the dishwasher

FIG. 3 is a flowchart for displaying anomaly contents by a service check.

[Explanation of symbols]

 1 control device 2 display device 3 key input device 4 sensor 5 load drive means 6 load 7 memory

Claims (3)

[Claims] 1. A key input device for setting a drying time, a driving course, etc., a control device for performing a series of sequential operations of cleaning, rinsing, and drying, a display device for displaying the progress thereof, and the control device. A dishwasher that has a load driving device to control and a sensor that detects an abnormality content during operation and outputs it to the control device, and the control device stores and retains the abnormality content even when the power switch is cut off. Control device. 2. The control device for the dishwasher according to claim 1, wherein the control device displays the stored abnormality content on the display device by operating the key input device according to a preset order. 3. The control device for the dishwasher according to claim 1, wherein when the control device starts a series of sequential operations of cleaning, rinsing and drying after confirming the abnormality content, the stored abnormality content is erased.