JP2805558B2 - Washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine with a built-in microcomputer provided with an inverter circuit.

[0002]

2. Description of the Related Art In conventional microcomputer washing machines, there are many types of failure diagnosis contents, and display at that time due to mishandling by a user or the like.

[0003] In addition, when performing a failure diagnosis display, it has been limited to when the motor for rotating the pulsator and the dewatering tub is stopped.

As described above, the conventional model does not have the function of storing the failure mode and the content of the handling error.

[0005]

In the above-mentioned prior art, in a microcomputer type washing machine provided with an inverter circuit, the number of failures increases due to the provision of the inverter circuit, and serial communication becomes abnormal due to the strong influence of external noise. Some failures cannot be reproduced immediately. A conventional washing machine that does not have a failure content memory has a disadvantage that it takes a long time to find the cause of the failure, and the service efficiency is poor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a washing machine which can quickly display the contents of failure diagnosis and improve service efficiency even in a microcomputer type washing machine having an inverter circuit.

[0007]

As shown in FIGS. 1 and 2, the operation means 4 of the washing machine main body 1 includes a switch 5 for self-diagnosis and a timer display section 8 as shown in FIGS.
And a control unit for controlling the display of the display unit 8 are provided,
The control unit displays the normal time display and the ON operation of the switch 5 so that the display unit displays the failure mode and the handling error that occurred in the past according to the latest stored contents and the previously stored contents . Means for simultaneously displaying error messages.

The means for solving the problems according to claim 2 is the display unit 8
Has a four-digit display area, and the failure diagnosis content is
The error display of the latest stored contents is displayed in the digit,
The error display of the content stored last time is performed on the digit, and the failure diagnosis content of the two modes is simultaneously displayed.

[0009]

In the above means for solving the above problems, by turning on the switch 5 for self-diagnosis of the operation unit 4, the latest failure and the handling error content M1 stored in the control unit are obtained. depending on the content M 2 of the last generated, an error message is displayed on the timer display, informing the user.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the contents of failure diagnosis of a microcomputer type washing machine having an inverter circuit according to the present invention will be described below with reference to FIGS.

FIG. 3 is a perspective view of the washing machine. A washing and dewatering tub 2 is provided inside a washing machine main body 1, and a pulsator 3 is rotatably provided at the center of the bottom.

An operation unit 4 used by a user is provided on the upper surface of the main body 1 of the washing machine. This operation unit 4 looks the same as the conventional machine, but is provided with a push-button switch 5 for self-diagnosis only at one point. That is, the operation unit 4 includes a push-button switch 5 for self-diagnosis (not self-holding), a power switch 6 and a start switch 7.
And a timer display section 8 (display).

The inverter electrical unit 11 for controlling the three-phase induction motor or the DC brushless motor 10 for driving the pulsator 3 and the like is located on the lower side of the lid 1a.

The timer display section 8 has a four-digit display area, and is controlled so as to normally display minutes in the lower two digits and hour display in the upper two digits. Further, there are five types of patterns displayed on the timer display section 8, and a clock display, a reserved time display, a remaining time display, an error display at the time of failure and mishandling, and a failure diagnosis storage display can be performed. In particular, in the failure diagnosis contents display, as shown in FIG. 2C, an error display of the latest stored contents is performed in the lower two digits, an error display of the previously stored contents is performed in the upper two digits, and a two-mode error is displayed. The failure diagnosis contents are displayed at the same time.

The control section for controlling the timer display section 8 is mainly composed of a main control circuit section 12 having a microcomputer. The main sequence control of the washing machine is performed by the main control circuit section 12, and information is transmitted to the motor control circuit section 30 by the serial communication 14 which can transmit and receive each other.

The main control circuit section 12 includes a means for displaying a normal time, a means for storing again a memory M0 for error display contents in the event of a failure or mishandling in the memories M1 and M2, When the button switch 5 is turned on, the timer display section 8 has means for switching to an error display corresponding to the HEX number in the memories M1 and M2.
The main control circuit 12, the or abnormal heat generation discovery switching-element 26 and the diode yellowtail Tsuji 24 in the inverter circuit 22, the overcurrent protection circuit of the switching-element 26
Of the inverter circuit, such as the failure of the serial communication 14 for exchanging information between the main control circuit unit 12 and the motor control circuit unit 30, and the mechanical failure of the conventional washing machine and the mishandling of the user, Means for replacing and displaying error numbers (E1 to E9, EC) are provided. Although not shown in FIG. 3, the main control circuit unit 12 is incorporated below the operation unit 4.

In FIG. 1, reference numeral 16 denotes a water supply valve;
Is a drain valve, 18 is a water level sensor, 19 is a lid opening / closing switch, 20 is a dewatering tank safety switch, and 21 is an AC current sensor. Reference numeral 22 denotes an inverter circuit. The circuit 22 rectifies an AC power supply 23 by a diode bridge 24, turns on and off a power supply smoothed by a smoothing capacitor 25 by a switching element 26, and applies the power to the motor 10. It is. The on / off of the switching element 26 is
The operation is performed by the motor control circuit unit 30 based on the signals of the temperature sensor 28 and the DC current sensor 27 .

Next, the operation procedure of the washing machine according to the present invention will be described. As an example, it is assumed that the lid 1a is open, so that the dehydration operation cannot be performed, and then the lid 1a is always closed and the normal operation is repeated, but a failure has occurred in the switching element 26 and an overcurrent has flowed.

The detection of the opening / closing of the lid 1a is performed by the lid opening / closing switch 19, and is inputted to the main control circuit section 12. As shown in FIG. 4, the operation procedure is as follows. Since the lid 1a is open, the dehydration operation cannot be performed, the operation is stopped, and (01) is stored in the error display content memory M0 when a failure or mishandling occurs.
H) is set. Then, as shown in the error display subroutine of FIG. 6 and FIG. 2, the timer display unit 8 in the operation unit 4 is switched from the remaining time display of FIG. A to the error display content of FIG. "E1" flashes and an error tone sounds at the same time.

Next, the contents of the memory M1 storing the latest contents of the failure and the handling error are checked.
If there is no storage (00H), the content (01H) of M0 is input to M1.

When the above processing is completed, the user can restart by closing the lid 1a.

Thereafter, when a malfunction occurs in the switching element 26 and the DC current sensor 27 detects an overcurrent, the motor control circuit section 30 stops the switching and then inputs the content to an internal microcomputer. And
The motor control circuit unit 30 transmits operation information of the overcurrent protection circuit to the main control circuit unit 12 via the serial communication 14. The received main control circuit unit 12 stops the sequence control of the washing machine and sets (07H) in the memory M0. The error display on the timer display section 8 also blinks “E7” in the lower two digits as in the previous case of opening the lid.
Since the previous (01H) is input to the memory M,
1 is moved to the memory M2. Then, the content (07H) of M0 newly generated this time is input to the memory M1 of the main control circuit unit 12.

When the above processing is completed, the main control circuit 1
2 issues a command to the motor control circuit unit 30 via the serial communication 14 to retry, releases the latch function to the overcurrent protection circuit, and returns to normal operation.

Next, when the push-button switch 5 for self-diagnosis of the operation section 4 is turned on, the microcomputer in the main control circuit section 12 reads the data and always stores the latest failure and mishandling stored in the RAM. In accordance with the content M1 and the HEX number of the content M2 generated last time, E () is displayed on the timer display section 8 to notify the user. For example, as shown in FIG. 2C, an error display “E1” with an open lid is displayed in the upper two-digit hour display area, and an overcurrent detection error display “E7” is displayed in the lower two-digit minute display area. Do.

As described above, when two types of failures and mishandlings occur, the contents thereof are stored in the memories M1 and M2, and when the failure diagnosis switch 5 is turned on,
The display on the timer display section 8 switches from the clock display to the failure diagnosis display.

Therefore, of the five types of patterns to be displayed, the error display at the time of failure or mishandling has the highest priority, and its contents are described in the flow chart of the failure diagnosis storage display subroutine of the flowchart of FIG. Be executed.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention.

[0028]

As is apparent from the above description, according to the present invention, although the inverter washing machine has a complicated electronic circuit, the inverter washing machine has a failure diagnosis storage function . Failure modes and handling
Error of the most recent memorized content and the last memorized content
Since the display is performed at the same time, when the user requests a repair , the user can more accurately and surely hear the details of the failure and the error number, and the level of the estimated contents of the failure cause is improved.

2) According to 1), repair parts can be prepared in advance.

3) When there are many mishandlings by the user,
He can give detailed instructions on how to handle it.

As described above, the time required to find the cause of a failure can be reduced, and service efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electronic circuit of an inverter washing machine according to the present invention.

FIG. 2 is an explanatory diagram of display contents of a timer display unit.

FIG. 3 is an external view of the main body of the washing machine.

FIG. 4 is a control flowchart of a timer display unit.

FIG. 5 is a control flowchart of a timer display unit.

FIG. 6 is a control flowchart of a timer display unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing machine main body 2 Washing dehydration tub 3 Pulsator 4 Operation part 5 Switch for failure diagnosis 6 Power switch 7 Start switch 8 Timer display part 10 Motor 11 Inverter electrical part 12 Main control circuit part

Continuation of the front page (56) References JP-A-3-259398 (JP, A) JP-A-62-247991 (JP, A) JP-A-1-185291 (JP, A) JP-A-1-164392 (JP) JP-A-63-153093 (JP, A) JP-A-57-39888 (JP, A) JP-A-5-15685 (JP, A) JP-A-61-15882 (JP, A) (58) Field surveyed (Int.Cl. ⁶ , DB name) D06F 33 / 02,39 / 00 G08B 19 / 00,23 / 00 H02M 7/48

Claims (2)

(57) [Claims] An operation unit of a washing machine main body is provided with a switch for self-diagnosis, a timer display unit, and a control unit for controlling display of the display unit. And means for causing the display unit to simultaneously display the most recently stored contents of a failure mode and a handling error that occurred in the past and an error display corresponding to the previously stored contents by the ON operation of the switch. A washing machine characterized by having a washing machine. 2. The display unit according to claim 1, wherein the display unit has a four-digit display area. In the failure diagnosis content, an error display of the latest stored content is displayed in the lower two digits, and the last two digits are displayed in the upper two digits. A washing machine characterized in that an error display of the stored contents is performed and two modes of failure diagnosis contents are simultaneously displayed.