JPS5921616B2 - electronically controlled cooker - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electronically controlled cooking appliance.

In conventional electronically controlled cooking appliances, heating is performed by controlling energization of heating energy generating means in a control section.

When an abnormality occurs in the cooking appliance, the abnormality is detected by the abnormality detection means, and in this case, the control section enters an abnormality standby state to stop controlling the energization to the heating energy generation means.

After repairs have been made and the abnormal state has been canceled, by operating a reset key provided on the operating section on the front of the cooker, the control section can exit the abnormal standby state and switch the heating energy back on. The normal operating state is returned to control the energization of the generating means.

Here, after the above-mentioned abnormal state is canceled, the user forgets to operate the reset key because the user is living in the home, and in this case, the above-mentioned control section remains in the abnormal standby state, so even if heating is not performed next time, such heating will not occur. The disadvantage is that it is not executed.

The present invention has been made in view of these points, and an embodiment of the present invention will be described below regarding a fryer for frying foods.

Note that microwave heating is also used in this fryer in order to shorten the frying time.

In other words, -B: The dielectric loss of food is sufficiently larger than that of oil, so when microwaves are applied to a place where food and oil exist, most of the microwaves are absorbed by the food, and therefore microwave heating In a fryer that uses both, the food is heated with oil from the outside and heated with microwaves from the inside, so the frying time of the food is considerably shortened.

In Figures 1 and 2, 1 is a heating chamber, that is, an oil tank;
is a door that opens and closes the front opening 2' of the oil tank, and when the door is opened and closed, a door switch, which will be described later, is turned off and on.

3 is a heater provided at the bottom of the oil tank 1 to heat the oil 4 placed in the oil tank 1, and 5a and 5b are the first heaters with built-in thermistors. a second temperature sensor, a second temperature sensor 5b;
is located higher.

6 is a magnetron that oscillates microwaves; 7 and 7 are foods; 8 is a basket in which the foods are placed; 9a' and 9b are a pair of drives connected to each other and rotatably supported on a support shaft 10; A suspension shaft 11at of the car 8 is attached to one end of the drive rod.
llb is attached.

12 is a drive motor; 13 is a drive rod that is directly connected to the drive shaft of the motor and has a free end connected to the other end of the drive rod 9b; 14a and 14b are first drive rods that respectively restrict rotation of the drive rod; ．． This is the second regulatory department.

When the motor 12 is energized, the drive rod 13 is rotated counterclockwise by the rotational force of the motor 12 until it comes into contact with the second restricting portion 14b, and the rotation frames 9a and 9b are rotated clockwise. It rotates, and thus the heel 8 rises.

On the other hand, when the motor 12 is de-energized, the motor 12
The turning force is lost, and as a result, the above-mentioned dowel 8 descends under its own weight.

Incidentally, such descent stops when the drive rod 13 rotates clockwise and comes into contact with the first regulating portion 14a.

15 is a car switch which is turned on at the other end of the rotating frame 9b when the clutch 8 is completely lowered.0 Figure 3 shows the circuit of the fryer, 15' is the commercial power supply, and 16 is the above-mentioned High voltage supply circuit that supplies high voltage to the magnetron 6, 1
7.18 and 19 are the 1st. With the second and third relay switches,
When each of them is turned on, the high voltage supply circuit 16, heater 3, and motor 12 are energized.

20 is a microcomputer (hereinafter referred to as μCOM) that controls the fryer; 21, 22, and 23 are the μCOs, respectively;
1st from M. Second. Third switch signal R1, R2, R
1st to turn on by 3. Second. a third switching circuit;
24, 25, and 26 are the first and second degrees, respectively. When the third switching circuit is turned on, the first and second switching circuits are switched on. The first relay switch is energized to turn on the third relay switch 17, 18, 19. Second
．． A third relay coil, 27, is provided on the front of the fryer,
An indicator 33a includes a main display section 28, an abnormality display section 29, an oil amount display section 30, a basket display section 31, and an oil temperature display section 32 for displaying remaining frying time, oil temperature, etc.

33b are the above-mentioned No. 1. The first temperature sensor converts the output signals of the second temperature sensors 5a and 5b into digital signals. A second A-D (analog-digital) converter 34 is an operation section provided on the front of the fryer, and the operation section includes a group of keys 35 for setting the frying time and microwave time, and a start key 36.
A switching knob 37 is provided that can be switched between two positions: "off" and "fly".

38 is a buzzer; 39 is a buzzer-1 drive circuit that drives the buzzer 38 to sound by the S signal from μC0M2O; 4
0 is a door switch that is turned off and on when the door 2 is opened and closed.

Next, the operation of the fryer is shown in FIG.
This will be explained based on the program flowchart of 2O.

Normally, the knob 37 of the operating section 34 is in the "off" position, and in this case, the programs SL, S2. It is cycling through the S3 step.

In the S1 step, a signal corresponding to the switching position of the knob 37 is written in the position register PST of μC0M2O, and in the S2 step, the signal corresponding to the switching position of the knob 37 is written in the position register PST of μC0M2O.
It is determined whether or not it is in the "off" position.

In step S3, all registers and flags in μC0M2O are cleared and the first . 2nd switch signal R
1.degree. R2 is completely stopped and output of the third switch signal R3 is started. Therefore, in the circulation state, the heel 8 is raised by the 1 drive of the motor 12 and comes out of the oil.

Therefore, when performing the fly operation, first turn the knob 37 to 1.
Switch to "Fly" position.

Then, the program is SL, S2. The process exits the cyclical state of step S3 and proceeds to steps 84-S7.

In step S4, the key operation at the time of the dust is detected in the key group 35 of the operating section 34, and if the fly time and microwave time have been set, these are written in the fly register FRY and microwave register MCRK of μC0M2O, respectively.

Usually, the frying time is set longer than the microwave time.

At step S5, output of the third switch signal R3 is started.

Incidentally, since the signal R3 has already been output, the current step has no meaning.

In step S6, the temperature detected by the first temperature sensor 5a is written to the detection register DET1, and the temperature detected by the first temperature detector 5a is written to the detection register DET1, and
is displayed on the main display section 28 of.

In step S7, the temperature detected by the second temperature detector 5b is written into the detection register DET2.

In the next 88 steps, both detection registers DET1 and D
Based on the contents of ET2, the first. Second temperature sensor 5 a
> 5 b It is determined whether there is a difference of 10° C. or more between the detected temperatures.

Usually, the first. The second temperature sensors 5a and 5b are both submerged in the oil, so the respective detected temperatures are the oil temperatures and there is no difference between them.

In addition, when the second temperature sensor 5b comes out from the oil due to a decrease in the amount of oil when the oil is heated to a high temperature, the second temperature sensor 5b
1. detects the atmospheric temperature inside the oil tank 1, and the detected temperature becomes extremely low. A difference of 10° C. or more occurs between the respective detected temperatures of the second temperature detectors 5a and 5b.

Next, in step S9, it is determined based on the contents of the detection register DET1 whether the oil temperature has reached an abnormally high temperature, for example, 195° C. or higher, but since this does not normally occur, the program continues to step S10.

In this step, the oil temperature is kept within a predetermined range, for example, 116°C to 1°C.
In order to maintain the temperature within the range of 30°C, the above detection resistor DET1
2nd switch signal R based on the detected oil temperature written in
2 output control, that is, energization control to the heater 3 is started.

In the following S11 step, the oil temperature is 116°C to 130°C.
It is determined whether the temperature is maintained within the range of ℃.

In this case, assuming the oil temperature is low enough, the program is S.
At step 12, the appropriate temperature flag GD is cleared.

In the next step 813, it is determined whether or not the appropriate temperature flag GD is 1, but since it is currently O, the program is
Return to step SL, S2. The steps S4 to S13 are cycled (hereinafter, such cycle will be referred to as the first loop).

Then, as the heating of the oil progresses and the oil temperature is maintained within the range of 116 DEG C. to 130 DEG C., the program exits the first loop at step Sll and proceeds to step S14.

In this step, the appropriate temperature flag GD is set to 1.

The program then proceeds to step 813, but since the appropriate temperature flag GD is 1 in this case, the program then proceeds to step S15.

In this step, it is determined whether or not the start key 36 is currently being operated, but since it is not currently being operated, the program then returns to step S1 and returns to step S1.

S2. S4-S11. S14. S13. Step S15 is cycled (hereinafter, such cycle will be referred to as the second loop).

Then food 7, 7. is placed in basket 8. After closing the door 2, press the keys to set the desired frying time of 4 minutes and the microwave time of 2 minutes using the key group 35.The frying time of 4 minutes and the microwave time of 2 minutes will be set respectively. At step S4, fly register FRY and microwave register MCR
written to.

Next, when the start key 36 is operated, the program exits the second loop at step 815 and returns to step 816°S17.
Reaching the steps.

At step S16, the output of the third switch signal R3 is stopped and the heel 8 begins to descend under its own weight.

In step S17, 10 seconds is written to the register CNT, and the register CNT starts decrementing the time every 1 second from the 10 seconds.

In the following step S18, it is determined whether the car switch 15 is on or not, but in this case, since it is just after the descent of 8 has started, the car switch 15 is not on, so the program is Next, the process advances to step S19.

In this step, it is determined whether the register CNT is O or not, but since it is not 0 now, the program returns to step S18, and then returns to step S18. Cycle through step S19.

Here, the car 8 normally descends completely before the register CNT becomes 0, that is, before 10 seconds elapse after the car 8 starts descending, and the car switch 15 is turned on.

Then, when the car switch 15 is turned on, the program S
20. S21. S22. Proceed to step S22'.

In step S20, time decrement in the register CNT is stopped and its contents are cleared.

In step S21, the frying time is 4 minutes and the microwave time is decreasing every 1/2 second in the frying register FRY and the microwave register MCR, and the first switch signal R1 is outputted to start microwave heating. Ru.

In step S22, the remaining fly time is displayed on the main display section 27.

In step 822', the temperature detected by the first temperature sensor 5a is written into the detection register DET1.

Next S23. S24. In step S25, the above steps are performed in step S7.
．． S8. This is similar to step S9.

In step 826, it is determined whether or not the remaining fly time is 0 in the fly register FRY, but for now O
Since this is not the case, the program advances to step S27.

In this step, it is determined whether the remaining microwave time is 0 in the microwave register MCR, but since this time is not O at the moment, the program returns to step S22. S22'.

Steps S23 to S27 are cycled.

When the remaining microwave time becomes 0, the program exits this cyclical state at step 827 and proceeds to step S28.

In this step, the time reduction in the microwave register MCR is stopped, and the output of the first switch signal R1 is also stopped to stop microwave heating.

Thereafter, the program returns to step S22. S
The process cycles through steps 22' and S23 to S28, but when the remaining frying time reaches O, the process exits this cycle at step 826 and reaches step S29.

In this step, the time reduction in the fry register FRY is stopped, and the output of the third switch signal R3 is started, the basket 8 is raised and the foods 7, 7, etc. are lifted out of the oil, and therefore the frying operation is started. ends.

Furthermore, in step S29, if the first switch signal R1 is being output, the output of this signal is stopped, and the signal S is output for a predetermined period of time and the buzzer 38 is sounded to notify the end of the process.

In response to this notification, the cook opens the door 2 and releases the food 7, 7...
・Take out.

Thereafter, the program returns to step S1 and enters the second loop.

Then, when the knob 37 is returned to the "off" position, S1, S2.
Cycle through S3 steps.

Next, a case where an abnormal condition occurs in the fryer will be explained.

First, when the program is in a loop passing through step S8 or S24, when the second temperature sensor 5b comes out of the oil due to a decrease in the amount of oil while the oil 4 is being heated to a high temperature, as described above (the first .There is a difference of 10°C or more between the detected temperatures of the second temperature detectors 5a and 5b.
The program runs from step S8 or S24 to step 830.

In this step, the abnormality display section 29 of the display 27 starts blinking at a predetermined period, and the oil amount display section 30 starts lighting up continuously.

In the subsequent step S31, the signal S is intermittently output for 15 seconds at a predetermined cycle (for example, output for 0.2 seconds at a 0.4 second cycle), and the buzzer 38 starts to sound intermittently.

Furthermore, in step S31, the first. Second switch signal R1
, R2 are output, they are completely stopped and microwave heating and heater heating are stopped, and if output of the third switch signal R3 is stopped, output is started and the signal 8 rises.

The program then remains at the next step 832 as long as the door switch 40 is turned on by closing the door 2.

Here, when the cook is notified of an abnormal condition of the fryer,
First, open the door 2 and check the condition inside the oil tank 1.

In this case, the abnormal state of decrease in oil amount causes the abnormality display section 29 to blink, the oil amount display section 30 to light up, and the buzzer 3 to
8, the cook opens the door 2 to check whether the amount of oil has decreased.

Then, the program exits step S32 and reaches step S33.

In this step, the output of the signal S is completely stopped, so that the intermittent ringing is stopped within 15 seconds from the start of the intermittent ringing.

Furthermore, in step 833, the blinking of the abnormality display section 29 changes to continuous lighting.

Subsequently, the program remains at step S34 unless the door switch 10 is turned on again by closing the door 2.

When the door 2 is closed after the second temperature sensor 5b has added oil until it reaches 0-, the door switch 40 is turned on.

The program then proceeds to step S35.

In this step, the lighting of all display sections including the abnormality display section 29 is subsequently stopped.

The program then returns to step S1.

Here, the stopped state in the above steps S32 and S34 is a so-called abnormal standby state, and after exiting the abnormal standby state, the process proceeds to S1.
Returning to the step means returning to normal operating conditions.

Next, if the program is in a loop that passes through the above steps S9 or S25, the oil temperature may change to 19 for some reason.
If the temperature reaches an abnormally high temperature of 5℃ or higher, the program will switch to S9 or S.
From 25 steps to 836 steps.

In this step, the abnormality display section 29 blinks at a predetermined period, and the oil temperature display section 32 starts to light up continuously.

The program then proceeds to step 832 via step S31.

The cook then opens the door to confirm whether or not to take appropriate measures to lower the oil temperature based on the oil temperature abnormality notification.
open it.

When the door 2 is closed after taking appropriate measures, the program reaches step S1 as described above.

Further, in step S16, after the car 8 has started to descend, if the car 8 is caught by a foreign object in the oil tank 1 and has not descended completely even after 10 seconds have elapsed, and the car switch 15 is still off, the program will continue. From step S19 to step 837.

In this step, the abnormality display section 29 starts blinking at a predetermined period, and the car display section 31 starts lighting up continuously.

Further, in step S37, time decrement in the register CNT is stopped and its contents are cleared.

Next LIT, the program passes through step S31 and reaches step S32.

Then, the cook opens the door 2 to check whether the heel 8 is caught on a foreign object in the oil tank 1 based on the heel abnormality notification.

When the door 2 is closed after repairs have been made to prevent it from getting caught, the programmer returns to step S1 as described above.

As is clear from the above description, according to the present invention, the heating chamber,
A door that opens and closes the opening of the heating chamber, a door switch that is activated by opening and closing the door, a heating energy generating means that generates heating energy for heating food in the heating chamber, and controlling energization to the heating energy generating means. and an abnormality detection means for detecting an abnormality in the cooking device, the control unit comprising:
Upon detection of an abnormality by the abnormality detection means, an abnormal standby state is entered to stop the control of energization to the heating energy generating means, and when the door switch is operated thereafter, the abnormal standby state is exited and the energization to the heating energy generating means is stopped. Since it returns to the normal operating state for control, there is no need to operate the reset key like in the past, and there is no need to worry about forgetting to operate the reset key. Can be provided.

[Brief explanation of the drawing]

The figures show a flyer according to an embodiment of the present invention, and FIG. 1 is a front sectional view;
FIG. 2 is a side sectional view, FIG. 3 is a circuit diagram, and FIG. 4 is a program flow chart of the microcomputer. 1...Oil tank, 2...Door, 2'...
...Opening, 3...Heater, 5a, 5b...
...First. Second temperature detector, 6... Magnetron, 8... Car, 12... Drive motor, 15... Car switch, 20...・
Microcomputer, 10...Door switch.

Claims (1)

[Claims] 1. A heating chamber, a door that opens and closes the opening of the heating chamber, a door switch that is activated by opening and closing the door, a heating energy generating means that generates heating energy for heating food in the heating chamber, and a heating energy generating means that generates heating energy for heating food in the heating chamber. and an abnormality detection means for detecting an abnormality in the cooking device, and the control unit is configured to perform an abnormality standby for stopping the control of energization to the heating energy generation means when the abnormality detection means detects an abnormality. The electronically controlled cooking appliance is characterized in that when the door switch is activated, the electronically controlled cooking appliance exits the abnormal standby state and returns to a normal operating state for controlling energization of the heating energy generating means.