JPH0453079B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention relates to a diagnostic control device, and more specifically, a diagnostic control device for easily finding the location of a failure when a failure occurs in various devices such as microwave ovens and microwave ovens. Regarding equipment. <Prior art> Microcomputers have traditionally been incorporated into various devices such as cooking appliances and office equipment to control the execution of various functions, thereby allowing complex functions to be executed automatically and in a short time. I am now able to do this. In order to cope with the increasing complexity of control, the device is equipped with a so-called self-diagnosis function that allows the device itself to detect and display the location of the failure when a failure occurs. This self-diagnosis function operates to automatically display the fault location when a fault occurs, so diagnostic sensors are attached to various functional parts that are set as parts to be diagnosed, and any When the sensor outputs a signal indicating a failure condition,
It is necessary to use this signal as input to drive the display. As a result, when a failure occurs and the device cannot operate normally, the location of the failure can be automatically detected and displayed. <Problems to be Solved by the Invention> However, when the above self-diagnosis function is incorporated, there is a problem in that it is necessary to attach a sensor to each sensor separately, which complicates the configuration. This problem becomes particularly serious when the number of functional parts constituting a functional section increases as devices become more multifunctional. Furthermore, this problem is caused by the addition of a self-diagnosis function that is not the original function of the device, which imposes a financial burden on users who do not receive much benefit from this self-diagnosis function. Particular emphasis is placed on this point. This invention was made in view of the above-mentioned problems, and it is possible to simplify the configuration without installing a sensor to specifically detect the state of the functional part.
It is an object of the present invention to provide a diagnostic control device that can easily detect a location where a failure occurs. <Means for Solving the Problems> To achieve the above object, the diagnostic control device of the present invention selects an operating state in which a specific functional section is operated from among the functional sections provided in each section of the device. at least one input means attached to the apparatus main body, a switch means for selecting a diagnosis mode for diagnosing the state of the apparatus main body, and a diagnosis mode selection signal from the switch means as an input; and control means for driving only the functional section corresponding to the operating state selected based on the signal. However, the number of input means may be smaller than the number of functional sections, and the control means may drive preset functional sections in accordance with the number of times of signal input from the input means. In addition, the above-mentioned functional section is a display device, and a number set in advance,
It may also be something that displays a symbol. Furthermore, the switch means may be an unexpected combination of input means, or may short-circuit specific electrical components built into the main body of the apparatus. <Function> With the diagnostic control device having the above configuration, by operating the input means in a state in which the switch means selects the diagnosis mode for diagnosing the state of the main body of the device, preset functional units can be driven. You can select the state. Since the control means operates only the relevant functional unit, the user can check whether the relevant functional unit is actually operating or not.
It can be determined whether the input means and the functional unit are normal. In addition, if the number of input means is smaller than the number of functional parts, and the control means drives a preset functional part in correspondence with the number of signal inputs from the input means, the number of times the input means is operated is Since each functional section can be driven by changing the input means, it is possible to determine whether the input means is normal and whether the functional section is normal or not, independently of each other. Furthermore, if the functional unit is a display unit that displays preset numbers and symbols in response to input signals from the input means, it is necessary to check whether the input means is normal or not, and whether the display unit It is possible to determine whether or not these are normal independently of each other. Furthermore, if the switch means is an unexpected combination of input means, if the normal operation of the input means for operating the device is performed, the diagnostic mode will not be entered, and the unexpected combination of input means will not be activated. Diagnostic mode can only be entered by performing an operation. Additionally, if the switch means shorts out a specific electrical component built into the main body of the device,
As in the case above, diagnostic mode can only be entered if there is a true need to be in diagnostic mode. <Examples> Hereinafter, examples will be described in detail with reference to the accompanying drawings showing examples. FIG. 3 is an enlarged exploded perspective view of essential parts showing one embodiment of the cooking device of the present invention, FIG. 4 is a longitudinal sectional view, and FIG. 5 is a horizontal sectional view. In the figure, a cooking chamber 2 is provided inside an exterior body 1, and a door 1a that can be opened and closed closes a front opening of the cooking chamber 2. A magnetron 3 for introducing high-frequency radio waves into the cooking chamber is attached to the upper plate 2a of the cooking chamber 2, and a circulation fan 4 is attached to the space 2b formed by curving the back plate outward. Furthermore, the combustion space 5a between the lower plate and the exterior body 1
Gas burner 5 is installed on the Further, the front side of the circulation fan 4 has an opening 6a in the center for the circulation fan 4 to take in air, and an exhaust space 6c is formed in the periphery between it and the back plate of the cooking chamber 2. As the circulation fan 4 rotates,
Air is circulated inside the cooking chamber 2 by sucking air through the opening 6a and expelling air from the exhaust space 6c. Furthermore, a predetermined position on the back plate of the cooking chamber 2 (the above-mentioned exhaust space 6c)
By forming a communication hole 5b that communicates the combustion space 5a with the internal space of the cooking chamber 2 at a predetermined position closer to the outside, the effect of the circulation flow of the air allows
Combustion air obtained by igniting the gas burner 5 can be introduced into the cooking chamber 2. Furthermore, an exhaust port 2c is provided in the upper part of the space 2b.
By forming this, a part of the air being circulated can be discharged from the cooking chamber 2 into the atmosphere. In addition, 4a is a circulation motor for rotationally driving the circulation fan 4, 7 is a mounting table for placing the object to be heated, and 7a is a turntable mechanism for rotating the above-mentioned mounting table 7. , 3a is a control board for controlling the magnetron 3, etc., 8 is an operation panel, 8a is a control board for the operation panel, 9 is an interior light, and 10 is a thermistor. FIG. 6 is a front view of the operation panel 8, in which a start switch 8c and a cancel switch 8c are installed on the rightmost side in two stages, upper and lower, and on the left side there is a temperature adjustment knob 8d, a temperature fine adjustment screw 8u,
Install the timer knob 8e in this order, and on the left side, install the drying switch 8f, S switch 8g, defrost switch 8h, high speed range switch 8i, low microwave oven switch 8j, and combination switch 8.
k, high-power microwave switch 8m and preheat switch 8
n are installed in two stages, upper and lower, in this order, and a numeric display 8p is installed on the left side, and a gas continuous indicator 8 is installed above the numeric display 8p.
q and combustion indicator 8r are installed, and the brightness switch 8s and time setting switch 8 are installed on the leftmost side.
T is installed in two stages, upper and lower. In addition, the above drying switch 8f, S switch 8g, defrosting switch 8h,
LEDs 8fs, 8hs, 8is, 8js, 8ks, 8 in close proximity to high speed range switch 8i, weak microwave switch 8j, combination switch 8k, strong microwave switch 8m, and preheating switch 8n.
ms and 8ns are installed. FIG. 1 is a block diagram showing the electrical configuration of the main parts of the cooker, including a start switch 8b, a drying switch 8f, and an S
The microcomputer 11 receives signals from various switches such as the switch 8g, signals from the door switch 1b, and signals from the diagnostic mode selection switch 15 mounted on the control board 3a shown in FIG.
and an output signal from the A/D conversion circuit 13 which inputs the voltage signal output from the timer volume 12 operated by the timer knob 8e, and an output from the temperature detection circuit 14 having the thermistor 10. The microcomputer 11 receives the output signal from the A/D conversion circuit 19 which inputs the signal, the output signal from the rotary encoder 16 driven by the temperature control knob 8d, and the output signal from the flame rod 17 for ignition confirmation.
is being input. Then, the control signal from the microcomputer 11 is directly transmitted to the digit driver 1.
8 to the numeric display 8p, and the LED via the LED driver 20 and digit driver 18.
and the blower motor 23, interior light 25,
It is inputted to the first solenoid valve 27 and the magnetron 3, inputted to the triax 29 that controls the energization of the circulation motor 4a, and inputted to the igniter 31, the second
Transistors 30 and 3 control energization to the solenoid valve 33 and the buzzer 35, respectively.
2,34 is entered. In the electrical configuration shown in FIG. 1, for example, when the switch 15 is operated, a program corresponding to the diagnostic mode is loaded into the microcomputer 11, and various operating states and numerical displays are displayed as shown in Table 1. The display on the right two digits of device 8p,
The lighting of the LED and various functional parts are set in a predetermined correspondence relationship, and as shown in Table 2,
The temperature set by the temperature adjustment knob 8d and read by the rotary encoder 16 and the display in the left two digits of the numerical display 8p are set in a predetermined correspondence relationship. Here, the functional section refers to a section that performs some kind of operation or display according to instructions from the microcomputer 11, and whose operation or display can be checked from the outside, such as the numeric display 8p, the igniter 31, the blower motor, etc. 23, SV27,
33, magnetron relay, circulation motor 4a, buzzer 35, interior light 25, etc.

【table】

【table】

[Table] The operation when diagnosing a failure location using the cooker configured as described above is as shown in the flowchart of FIG. In this step, it is determined whether or not the diagnostic mode selection switch 15 is turned on, and if it is turned on, the microcomputer 11 loads a program corresponding to the diagnostic mode. Then, in the step, the value of the rotary encoder 16, which has read the set value of the temperature control knob 8d, is displayed in the left two digits of the numerical display 8p according to Table 2. As a result, the temperature set with the temperature control knob 8d is read into the rotary encoder 16, and the number or symbol corresponding to the set cooking temperature is displayed on the numeric display 8p through the microcomputer 11. By checking this number or symbol, the rotary encoder 1
6 or the numeric marking device 8p is in a state where it can operate normally. Next, in step it is determined whether any of the various switches have been operated. When any of the various switches is operated, the code corresponding to the operated switch is displayed in the right two digits of the numeric display 8p in accordance with Table 1 in step. By checking the displayed codes, it can be confirmed whether the various switches are operating normally and whether the operating signals have certainly reached the microcomputer 11. Furthermore, in the step, the functional section corresponding to the operated switch is activated. At this time, the functional section corresponding to the switch (hereinafter referred to as the "applicable functional section")
), and other functional parts are not operated. That is, the microcomputer 11 sends out operation signals to the relevant functional section, but does not send out any operation signals corresponding to other functional sections. Therefore, the cooking device itself does not perform normal cooking operations. This allows the inspector to
By focusing only on the functional section and checking its operating state, it can be confirmed whether a predetermined drive signal is transmitted from the microcomputer 11 to the functional section and whether the functional section is operating correctly. . To illustrate the above, the rotary encoder 16 is set to 200°C, and the start switch 8 is set to 200°C.
When b is operated, the number display 8p will display the number "11" on the right two digits and the number "30" on the left two digits, and the igniter 31 will be activated, so the inspector should By checking the display status and checking the sound or spark from the igniter 31 with your ears or eyes, you can confirm this display and whether or not the drive is being performed. It is possible to determine whether the device is in a state where it can operate. At this time, as mentioned above, since normal cooking operations are not performed, gas is of course not supplied. Next, in a step, for example, switch 15 is activated.
is turned OFF and the diagnostic mode is finished. If it is determined in this step that the diagnostic mode has ended, other processing is performed as is, but if it is determined that the diagnostic mode has not ended, the determination and processing in the following steps are repeated. Additionally, if it is determined in the above step that none of the various switches have been operated,
In the step, the value obtained by A/D conversion of the detection value of the thermistor 10 is displayed in the right two digits of the numerical display 8p (A to E at room temperature, blank when thermistor is open, 00 on thermistor short, and operate the temperature fine adjustment screw 8u). (approximately 3 digit change). Thereby, it can be determined whether the thermistor 10 is in a state where it can operate normally. Thereafter, in a step, the driving of the functional section is stopped, and the determination and processing subsequent to the step are performed. By operating the following different switches in sequence, check whether the corresponding numbers or symbols are displayed, the LEDs are lit, and the functional parts are operating to confirm that they can operate normally. It can be determined whether or not. As is clear from the above explanation, in the above embodiment, there is no need to attach sensors to each functional part, and each functional part can be operated normally using existing parts. It can be easily determined whether or not. Note that the present invention is not limited to the above-mentioned embodiment, and in FIG. 3, instead of the switch 15 for selecting the diagnostic mode, the diagnostic mode is selected by shorting the terminals of the connecting plaque 36 of the thermistor 10. It may be configured so that Therefore, in the case of this embodiment, special effort is required to short-circuit the terminals of the connection plug of the thermistor 10, which are not normally exposed to the outside, but there is no need to install a special switch. The configuration can be simplified. The specific procedure for determining the state is the same as in the above embodiment except for the selection operation of the diagnostic mode. It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, the diagnostic mode may be selected by simultaneously operating switches that are not operated at the same time during normal operation, or the display may be omitted. In addition to being possible, when the number of input means such as input switches is smaller than the number of functional parts, a specific functional part can be driven in accordance with not only the type of input means but also the number of operations of the input means. It is possible to make various design changes without changing the gist of the invention. <Effects of the Invention> As described above, the present invention enables normal operation by operating the existing input means and actually driving the existing functional parts set in advance without installing any special sensors etc. This has the unique effect of being able to directly and reliably determine through the eyes, ears, etc. whether or not the device is in a state where it can be performed.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the electrical configuration of the diagnostic control device, Fig. 2 is a flowchart explaining the diagnostic operation, and Fig. 3 is an enlarged exploded perspective view of essential parts showing an embodiment of the cooking device of the present invention. , FIG. 4 is a longitudinal cross-sectional view, FIG. 5 is a cross-sectional view, and FIG. 6 is a front view of the operation panel. 3... Magnetron, 8b... Start switch, 8c... Cancel switch, 8d... Temperature adjustment knob, 8e... Timer knob, 8f... Drying switch, 8g... S switch, 8h... Defrosting switch, 8i... ...High speed range switch, 8j...Weak microwave switch, 8k...Combination switch, 8m...High microwave oven switch, 8n...
...Preheating switch, 8p...Numeric display, 8q...
Gas continuous indicator, 8r... Combustion indicator, 8s...
Brightness switch, 8t...Time setting switch, 8
u...Temperature fine adjustment screw, 8fs, 8hs, 8is, 8js,
8ks, 8ms, 8ns...LED, 23...Blower motor, 25...Interior light, 27...First solenoid valve, 29...Triack, 31...Igniter, 33...Second solenoid valve, 35...
buzzer.

Claims (1)

[Scope of Claims] 1. A diagnostic control device for discovering failures in functional sections provided in various parts of the device, which controls the main body of the device to select an operating state for operating a specific functional section among the functional sections. at least one input means attached to the apparatus, a switch means for selecting a diagnosis mode for diagnosing the state of the main body of the apparatus, and a diagnosis mode selection signal from the switch means as an input, and based on the input signal from the input means. 1. A control device for diagnosis, comprising: a control means for driving only a functional section corresponding to an operating state selected by the user. 2. The number of input means is smaller than the number of functional parts, and the control means drives preset functional parts in accordance with the number of times of signal input from the input means. Diagnostic control device according to item 1. 3. The diagnostic control device according to claim 1, wherein the functional section is a display device that displays preset numbers and symbols in response to input signals from the input means. 4. The diagnostic control device according to claim 1, wherein the switch means is an unexpected combination of input means. 5. The diagnostic control device according to claim 1, wherein the switch means short-circuits a specific electrical component built into the main body of the device. 6. The diagnostic control device according to claim 1, wherein the input means is selected from various switches already installed in the device. 7. The device is a cooking device, and the functional part is selected from a display, an igniter, a blower motor, a solenoid valve, a magnetron relay, a circulation motor, a buzzer, and an interior light. diagnostic control device.