JPS5937098B2 - electronically controlled cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronically controlled cooking appliance that controls energization of heating energy generating means while detecting the temperature of a detected part.

Embodiments of the present invention will be described below regarding a fryer for frying food.

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

In other words, the dielectric loss of food is generally much larger than that of oil, so when microwaves are applied to an area where food and oil are present, most of the microwaves are absorbed by the food, and therefore microwave heating is difficult. In the combined fryer, 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, 3 is a heater installed at the bottom of the oil tank 1 to heat the oil 4 placed in the oil tank 1, 5 is a temperature sensor with a built-in thermistor (described later), and 6 is a magnetron that oscillates microwaves. , 7.7... are food products, 8 is a basket on which the food products are placed, 9a and 9b are connected to each other, and a support shaft 1
A pair of rotating frames are rotatably supported at 0, and the hanging shafts 11a and 11b of the heel 8 are hung on one end of the rotating frames.

12 is a drive motor; 13 is a drive rod that is directly connected to the drive shaft of the motor and whose free end is connected to the other end of the rotating frame 9b; and 14a and 14b are drive rods that restrict the rotation of the drive rod. 1. This is the second regulation section.

When the motor 12 is energized, the rotational force of the motor 12 causes the drive rod 13 to rotate counterclockwise until it comes into contact with the second restricting portion 14b, and the rotation frames 9a and 9b rotate clockwise. , and the above-mentioned 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.

A car switch 15 is turned on at the other end of the rotating frame 9b when the car 8 is lowered.

FIG. 3 shows the circuit of the fryer, where 15' is a commercial power supply, 16 is a high voltage supply circuit that supplies high voltage to the magnetron 6, and 17, 18, and 19 are first, second, and third relay switches, respectively. When 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, and 21, 22, and 23 are the μCs, respectively.
First, second and third switch signals R1, R2, from OM
The first, second, and third switching circuits 24, 25, and 26, which are turned on by R3, are connected to the first, second, and third relay switches 17, 18 when the first, second, and third switching circuits are turned on, respectively. The first, second, and third relay coils 27 are energized to turn on the oil temperature 19, and a display 27 is provided on the front of the fryer to display the oil temperature and remaining frying time. It consists of a character display part and a colon.

Reference numeral 28 denotes an operation section provided on the front side of the fryer, and the operation section includes a group of keys 29 for setting the frying time and microwave time, a start key 30, and two positions that can be switched to "off" and "frying". A switching knob 31 is provided.

32 is a ladder circuit which continuously inputs an 8-bit binary signal corresponding to the temperature of 1° C. from OoC to 255° C. from the μC0M2O and outputs a step waveform voltage □ as shown in FIG. 33 is a temperature detection section, and in this detection section,
34 is a thermistor manufactured by Shibaura Denshi Kogyo Co., Ltd., product number TNN-342, which is built into the temperature sensor 5, and 35 is a resistor having a resistance value of 13.8 Ω and connected in series with the thermistor.

The temperature detection section 33 outputs the detected oil temperature as a voltage ■T from the connection point between the thermistor 34 and the resistor 35. 336 outputs the voltage ■T to the positive input terminal.

It is a comparator that inputs the above voltage ■□ to the negative side input terminal, and outputs a match signal when both mold pressures match.

When the μC0M2O receives the coincidence signal, it detects the oil temperature based on the 8-bit binary signal output to the ladder circuit 32 at this timing.

Here, the above voltage ■.

As shown in FIG. 4, changes in an inverted S-shape according to changes in oil temperature.

When the oil temperature is in the temperature range of 90° C. to 190° C., the voltage vT is approximately equal to the voltage □, and there is almost no difference between the two.

On the other hand, as the oil temperature becomes smaller than 90℃, or
As the temperature rises above 90°C, a large difference arises between the two Den-Os.

Therefore, in a range where the oil temperature is lower than 90°C and in a range higher than 190°C, the detection accuracy of the temperature detection section 33 is poor, and an error occurs in the oil temperature detected by μC0M2O.

Here, in the fryer, the temperature detection section 33
It is sufficient that the detection accuracy is excellent in the temperature range of 90° C. to 190° C. Therefore, there is no problem in using the temperature detecting section 33.

However, when displaying the detected oil temperature on the display 27 based on the voltage (1) from the temperature detection section 33, if the detected oil temperature is displayed in a range where the detection accuracy is poor, the actual Since the temperature displayed is quite different from the oil temperature, a cook may feel distrustful of such a temperature display.

Therefore, in the above fryer, when the oil temperature detected by μC0M2O by the voltage 7 from the temperature detection unit 33 is lower than 90°C and when it is higher than 190°C, μC0M2O is
7 is prohibited from displaying the detected oil temperature.

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

Normally, the knob 31 of the operating section 28 is in the "off" position, and in this case the programs are S1, S2. It is cycling through the S3 step.

In the S1 step, a signal corresponding to the switching position of the knob 31 is written in the position register PST of μC0M2O, and in the S2 step, the signal corresponding to the switching position of the knob 31 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 output of the first to third switch signals R1 to R3 is completely stopped.

Therefore, when performing the fly operation, first turn the knob 31 to "
Switch to "Fly" position.

Then, the program is Sl, S2. After exiting the cyclic state of S3 step, proceed to S4. S5. Proceed to step S6.

In step S4, the current key operation in the key group 29 of the operating section 28 is detected, and if the fry time and microwave time have been set, these are written into the fly register FRY and microwave register MCR of μC0M2O, respectively.

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

In step S5, the third switch signal R3 is output, and the motor 12 is driven, so that the car 8 rises to come out of the oil.

At this time, the car switch 15 is turned off.

In step S6, the detected oil temperature based on the voltage vT from the temperature detection section 33 is written into the detection register DET.

In the following step S7, the detected oil temperature is 90°C to 190°C.
It is determined whether the temperature is within the temperature range of ℃.

In this case, assuming the oil temperature is low enough, the program is S.
This leads to 8 steps.

In this step, only "C" representing °C is displayed on the display 27 as shown in FIG. 6a.

In the next 89 steps, the oil temperature is adjusted to a predetermined range, for example 116
In order to maintain the oil temperature within the range of .degree. C. to 130.degree. C., output control of the second switch F-signal R2, that is, energization control to the heater 3, is started based on the detected oil temperature.

In the following S1o step, the oil temperature is 116℃~130℃ as mentioned above.
It is determined whether the temperature is maintained within the range of ℃.

In this case, the oil temperature is sufficiently low, so the program reaches step 811 and the appropriate temperature flag GD is cleared.

In the next step 812, it is determined whether the appropriate temperature flag GD is 1 or not, but since it is currently O, the program is
Returning to step S1, S2°, S4 to S1□ steps are cycled (hereinafter, such a cycle will be referred to as the first loop).

Then, when the heating of the oil progresses and the oil temperature falls within the range of 90 DEG C. to 190 DEG C., the program exits the first loop at step 87 and proceeds to step S13.

In this step, the detected oil temperature (for example, 91° C.) is displayed on the display 27 as <r91cJ, as shown in FIG.

Then, the program goes through steps 89 to S1□ to S1.
Return to step SL, S2. S4~S7 + S13
t Sg to S1□ steps are circulated (hereinafter, such circulation will be referred to as a second loop).

After that, the oil heats up further and the detected oil temperature reaches 1160C~
If the temperature is maintained within the range of 130°C, the program exits the second loop at step 810 and proceeds to step S14.

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

The program then proceeds to step 812, 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 31 is currently being operated, but since it is not being operated at the moment, the program then returns to step S1 and switches to Sl, S2, and S1.
4-S7・S13・S9・810・S14・812・S
15 steps (hereinafter such circulation will be referred to as the third loop).

Therefore, when the keys are operated to set the desired frying time of 4 minutes and the microwave time of 2 minutes using the key group 29, the frying time of 4 minutes and the microwave time of 2 minutes are set in the fry register FRY and the microwave time in step S4, respectively. Written to the rippled disk MCR.

Next, when the start key 30 is operated, the program exits the third loop at step 815 and reaches the sia step.

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

The program continues until the basket switch 15 is turned on after the basket 8 finishes descending, that is, the foods 7, 7...
S1 until it enters the oil for frying operation (oil heating)
It remains at step 7, and when the car switch 15 is turned on, it reaches step 818tS]9.

At step 818, the frying time is 4 minutes and the microwave time is decreasing every 1/2 second in the fry register FRY and the microwave disc MCR, and the first switch signal R1 is outputted to start microwave heating. be done.

At step 819, the remaining fly time (currently, for example, 3 minutes 4
0 seconds) is displayed on the display 2γ as shown in Figure 6C.
:40" is displayed.

Next, in step S20, it is determined whether the remaining fly time is 0 in the fly register FRY, but it is currently 0.
Since this is not the case, the program proceeds with step S21.

In this step, it is determined in the microwave disc MCR whether the remaining microwave time is O or not, but since this time is not 0 at the moment, the program returns to step S19 and cycles through steps 819 to 821. .

When the remaining microwave time reaches O, the program exits this circulation state at step 82□ and proceeds to step S2□.

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

After that, the program returns to step 819 and steps 819-S
It cycles through 22 steps, but then exits this cycle at step 820 until the remaining frying time becomes 0 and returns to step 823.
Reaching the steps.

In this step, time reduction in the fly register FRY is stopped, and the third switch signal R3 is outputted to the car 8.
Foods 7, 7. ... was pulled out of the oil,
Therefore, the frying operation is completed.

Further, in step S23, if the first switch signal R1 is being output, the output of this signal is stopped, and a buzzer (not shown) is sounded to report the completion.

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

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

Then, when the knob 31 is returned to the "off" position, 81. S2.
Cycle through S3 steps.

As can be seen from the above explanation, for the detected temperature in the range where the detection accuracy of the temperature detection section 33 is poor, the program passes through the first roof '0'') S3 step, so the detected temperature is not displayed on the display 27. Not done.

On the other hand, for a detected temperature in a range where the detection accuracy of the temperature detection section 33 is excellent, the program passes through step 813 of the second or third loop, so the detected temperature is displayed on the display 27.

As is clear from the above description, according to the present invention, there is provided a heating chamber, a heating energy generating means for generating heating energy for heating metal articles, a temperature detecting section for detecting the temperature of the detected part, and a temperature detecting section for detecting the temperature of the detected part. The control unit includes a control unit that opens and closes energization to the heating energy generating means based on the detected temperature, and a display that displays the detected temperature, and the temperature detected by the temperature detection unit is within a range where the detection accuracy of the temperature detection unit is inferior. In some cases, the control section prohibits the display of the detected temperature on the display, so that the cook does not feel distrustful of the temperature display, and an extremely practical electronically controlled cooking appliance can be provided.

[Brief explanation of drawings]

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, Fig. 4 is a main part output voltage characteristic diagram, Fig. 5 is a microcomputer program flow chart, and Fig. 6 a, b + c are respective display states on the display. It is a diagram. 1...Oil tank, 3...Heater, 20...
... Microcomputer, 27 ... Display unit, 33 ... Temperature detection section.

Claims (1)

[Claims] 1. A heating chamber, a heating energy generating means that generates heating energy for heating food, a temperature detecting section that detects the temperature of the detected part, and energizing the heating energy generating means based on the temperature detected by the temperature detecting section. and a display device that displays the detected temperature, and when the temperature detected by the temperature detection portion is in a range where the detection accuracy of the temperature detection portion is poor, the control portion displays the temperature detected by the display device. An electronically controlled cooking device characterized by prohibiting the display of.