JPS627450B2 - - Google Patents

Description

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

In recent electronically controlled cooking appliances, when the selection means is selected and set to a position corresponding to a desired cooking item among a plurality of cooking items, a signal corresponding to the selected position is output from the encoder, and a signal is output from the encoder based on this signal. Desired cooking is automatically performed.

However, the cooking device described above has a drawback in that it is not possible to independently manually set the desired heating time, heating temperature, etc., and therefore, it is not possible to perform cooking of items other than the plurality of cooking items described above.

The present invention has been made in view of these points, and embodiments of the present invention will be described in detail below with reference to the drawings regarding a microwave oven.

In Fig. 1, 1 is the main body of the microwave oven, 2 is a heating chamber disposed within the main body, and 3 is a device that detects infrared rays emitted from food in the heating chamber and outputs an analog signal according to the temperature of the food. Infrared detector, 4
5 is a door that opens and closes the opening of the heating chamber 2, and 5 is an operating section provided on the front surface of the main body 1. In the operation section, 6 is a display section on which a plurality of cooking item names, ie, 1 to 20, are listed and displayed; 7 is a selection means, ie, a knob, disposed vertically movably along the display section; 8; is an encoder placed behind the knob 7 in the main body 1, and when the knob 7 is selected and set to a position corresponding to the position where the name of the desired cooking item is written, the encoder 8 indicates the position of the knob 7. That is, a signal corresponding to the desired cooking item is output. In more detail, the output state of the signal from the encoder 8 is
To explain with the drawings, when the knob 7 is selectively set to each position of 1 to 20 corresponding to each position of the cooking item name of 1 to 20, the encoder 8 will output 1 to 20.
A 5-bit digital signal corresponding to each position is output. Further, the knob 7 can be set to the 21st and 22nd sub-positions, and when the knob 7 is set to such a position, the encoder 8 outputs a 5-bit digital signal corresponding to the 21st and 22nd positions. Output. When such a signal is output, heating can be performed by setting a timer, which will be described later. And the above knob 7
The signals corresponding to positions 1 to 22 form a Gray code system.

9 is a timer for setting a desired heating time by rotating the rotary knob 10; 11 and 12 are first and second lighting means, that is, first and second light emitting diodes; 13 is a start button; 14 is a This is a door opening lever for opening the door 4.

Figure 3 shows a circuit diagram of the microwave oven, 15
16 is a DC high voltage circuit for applying DC high voltage to the magnetron; 17 is a commercial power source;
Reference numeral 18 denotes a triax connected between the power source and the DC high voltage circuit 16, and when the triax is turned on or off, the DC high voltage circuit 1 is connected to the power source 17.
6 is controlled. Reference numeral 19 denotes a gate circuit for the triac 18, which includes a phototransistor 20 which is turned on by light emission from a light emitting diode, which will be described later, and outputs a gate signal for turning on the triac 18 when the transistor is turned on. Reference numeral 21 is a timer motor, and 22 is a relay switch connected in series to the motor, which is turned on when a relay coil, which will be described later, is energized.

23 is a microcomputer (hereinafter referred to as μCOM) that controls the microwave oven based on the signals from the encoder 8, etc.;
Cooking conditions, etc. for different types of cooking items are memorized.
ROM (read only memory) 24, storage area
ENCODE, TEMP, TEMP ₁ , K, COUNT,
COUNT ₁ and temporary stop flag FLG ₁ , coefficient flag
A count flag FLG ₂ and a count flag FLG ₃ are provided.
25 is an automatic return type start switch that is turned on when the start button 13 is pressed; 26 is the door 4;
A door switch 27 is a timer switch that is turned on when the heating time is set by the timer 9, and when the switches 25, 26, and 27 are turned on, 1 level signals a, b, and c are sent to μCOM.
23.

28 is an AD converter that converts the analog signal from the infrared detector 3 into a digital signal; 29-
33 are first to fifth transistors that are turned on by the 1-level signals A to E from the μCOM 23;
4 is a light emitting diode that emits light to turn on the phototransistor 20 when the first transistor 29 is on; 35 is a buzzer that sounds when the second transistor 30 is on; 36 is excited when the third transistor 31 is on; This is a relay coil that turns on the switch 22. When the fourth and fifth transistors 32 and 33 are turned on, the first and second light emitting diodes 11 and 12 respectively emit light.

Next, the operation of the above microwave oven is shown in Figure 4.
This will be explained along with a flowchart of the COM23 program.

Normally, the program remains at step _S1 unless the start switch 25 is turned on by pressing the start button 13, that is, unless the signal a is generated.

[] As shown in Figure 5, the time t until the temperature of the food reaches 95℃ and the time obtained by multiplying this time by a coefficient of 0.6 depending on the type of food, etc.
Cooking is performed with the total heating time being t+0.6t.

First, food is placed in the heating chamber 2 and the door 4 is closed. If such cooking corresponds to the fifth cooking item on the display section 6, the knob 7 is selectively set to a position corresponding to the position where the name of the cooking item is written. In this case, the encoder 8 outputs μ
Signal for 5th position on COM23 [11100]
(Figure 2) is input. Then, start button 1
When 3 is pressed, the above cooking is automatically executed. First, the start switch 25 is turned on by pressing the start button 13, thereby generating the signal a, and the program then reaches step S2. In this step, it is determined whether the content of the temporary stop flag _FLG1 is O. In this case, if O is selected, the program reaches step S3. In this step, the above signal [11100] input from encoder 8 is stored in the storage area ENCODE.
is read and stored. And the program is S
Proceed to step 4. In this step, the area
The signal stored in ENCODE is shown in Figure 222
It is determined whether the signal is one of the types of signals. If the signal stored in the ENCODE area becomes undesirable other than the 22 types of signals for some reason, the program immediately
Return to S1 step and press start button 1 again
Stays at SI step unless 3 is pressed. In this case, since the signal stored in the area EMCODE is [11100], which is one of the 22 types of signals mentioned above, the program reaches step S5. In this step, it is determined whether the signal in the area ENCODE is one of the signals corresponding to cooking items 1 to 20 of the above 22 types of signals, but the signal in the area ENCODE is 5 as described above. Since the signal corresponds to the second cooking item,
The program advances to step S6. In this step, based on the signal [11100] in the area ENCODE, signals representing the cooking conditions for the fifth cooking item, ie, 95°C and 0.6, are transferred and stored in the storage areas TEMP and K, respectively. Further, 1 is written to the coefficient flag FLG ₂ . Note that 1 is written to this flag FLG ₂ only when there is information to be transferred to area K.

The program then advances to step S7.
In this step, it is determined whether the door 4 is closed or not based on the presence or absence of the signal b. Since the door 4 is immediately closed, the signal b is generated when the door switch 26 is turned on. Therefore, it is determined that the door 4 is closed. Then, the program continues to steps S8 and S9. In step S8, the output of signals D and E is started, and the first and second light emitting diodes 11 and 12 begin to emit light.
In step S9, the output of the signal A is started, the triac 18 is turned on, and the magnetron 15 therefore starts to oscillate and microwave heating is started. The program then proceeds to step _S10 . In this step, an up count every second is started in the area COUNT. The program then proceeds to step S11. In this step, a signal corresponding to the temperature of the food from the AD converter 28 is stored in area _TEMP1 . The program then reaches step S12. In this step, the current food temperature is set to the above temperature as the cooking condition.
Area TEMP ₁ and TEMP whether 95℃ has been reached or not
The judgment is made by comparing the signals stored in the
The program reaches step S13. In this step, the closed state of the door 4 is determined as in the S7 step, but since the door 4 is currently closed, the program returns to the S11 step. Then, the program cycles through steps S11 to S13 until the temperature of the food reaches 95°C (hereinafter this process will be referred to as the first loop).

Then, when the heating progresses and the food temperature reaches 95℃, the program executes the above first loop in S12.
The process exits at step S14.
In this step, it is determined whether or not the content of the coefficient flag _FLG2 is 1. Since it is 1 in this case, the program proceeds to steps S15 to S17. In step S15, the up count in the area COUNT is stopped, and the up count in the area COUNT is stopped.
The contents of COUNT, that is, the count time, are multiplied by the contents of the area K, that is, 0.6, and the value is updated and stored in the area COUNT as a new heating time. In step S16, counting down every second from the time updated and stored in the area COUNT is started. In step S17, 1 is written to count flag _FLG3 . The program then proceeds to step S18. In this step, it is determined whether the contents of the area COUNT are O or not, but in this case, since counting has just started, the contents of the area COUNT are not O, so the program continues to step S19. reach. In this step, the closed state of the door 4 is determined as in steps S7 and S13, but since the door 4 is closed, the program returns to step S18 and continues in steps S18 and S19 until the content of the area COUNT becomes O. (hereinafter this process will be referred to as the second loop).

When the content of the area COUNT becomes O, the program exits the second loop at step S18 and then proceeds to steps S20 to S23. S20
In step S21, the count in the area COUNT is stopped, and in step S21, the output of the signals A, D, and E is stopped, and the microwave heating and the light emission of the first and second light emitting diodes 11 and 12 are stopped.
Therefore, the cooking of the fifth cooking item is completed. Coefficient flag in S22 step
FLG ₂ , count flag FLG ₃ and storage area
The contents of TEMP and K are cleared to O. S23
In step, signal B is output for several seconds and buzzer 3 is output.
5 will sound, thus announcing the end of cooking.
The program then returns to the SI step and remains there until the start button 13 is pressed for the next cooking run.

When the door 4 is opened to season the food during the first loop circulation during heating, the program exits the first loop at step S13 and proceeds to steps S24 and S25. . In step S24, the output of the signals A and E is stopped, and therefore the oscillation of the magnetron 15 is stopped, microwave heating is stopped, and the second light emitting diode 12 stops emitting light. At this time,
The first light emitting diode 11 is still emitting light. At S25 step, temporary stop flag FLG ₁
1 is written to . Therefore, the program is S1
Return to the step and stay there. and,
When the food is seasoned, the door 4 is closed, and the start button 13 is pressed again, the program moves from the SI step to the S2 step. However, in such a case, since 1 is written in the temporary stop flag _FLG1 , the program proceeds to step S26. In this step, the contents of the temporary stop flag _FLG1 are cleared to O. Next, the program
The process advances to step S27, where the same processing as in step S5 is performed. In this case as well, since the signal in the area ENCODE corresponds to the fifth cooking item, the program reaches step S28. The count flag is set at this step.
It is determined whether the content of FLG ₃ is 1 or not, and since it is O in this case, the program passes through step S7 and reaches steps S8 to S10, so that the second light emitting diode 12 emits light and the magnetron 15 starts to oscillate, and the area
The up-counting in COUNT is restarted from the time when the counting was stopped due to the door 4 being opened. Thereafter, the program enters the first loop.

Further, when the door 4 is opened to season the food during the second loop circulation during heating, the program exits the second loop at step S19. In the subsequent process, S28
The steps up to step are the same as when the door 4 is opened during the first loop circulation. and,
When the program reaches step S28, the content of the count flag _FLG3 is 1 in this case, so the program then advances to step S29. In this step, signals A and E are output, and the oscillation of the magnetron 15 and the light emission of the second light emitting diode 12 are restarted. Then, the program reaches step S16, and the down count in the area COUNT is restarted. Thereafter, the program passes through step S17 and enters the second loop.

For reference, for cooking items other than the fifth among cooking items 1 to 20, the cooking conditions stored in area TEMP in step S6 are the same as those stored in area K at 95°C. The content is 0.9. Alternatively, for still another cooking item, the content of the cooking conditions stored in the area TEMP in step S6 is 45° C., and the content stored in the area K is nothing. Note that if there is no content stored in the area K, the content of the coefficient flag _FLG2 remains O, and in this case, after the first loop ends, the process immediately proceeds to steps S21 to S23 via step S14. In this way, the contents of the cooking conditions stored in the areas TEMP and K are different for each cooking item.

[] Next, under 100% duty control (microwaves are constantly oscillated), cooking is performed with a heating time of 3 minutes manually set by timer 9.

First, food is placed in the heating chamber 2 and the door 4 is closed. Then, select and set knob 7 to the 21st position. Then, from encoder 8 μ
A signal [11111] (FIG. 2) for the 21st position is input to the COM 23. As will be understood from the explanation below, this signal [11111] sets 100% duty control. Then,
After manually setting the heating time of 3 minutes by turning the knob 10 on the timer 9, press the start button 13.
Press. Then, the program moves from step S1 through step S2 to step S3.
In this step, the above signal [11111] is the area
Stored in ENCODE. Then, the program passes through the S4 step and reaches the S5 step. In this case, the signal in the area ENCODE is for cooking item 1
Since there are no signals corresponding to ~20, the program then proceeds to step S30. In this step, the timer switch 27 is activated depending on the presence or absence of signal C.
The judgment is made based on whether the timer switch 27 is on or not, but since the timer switch 27 is already on with the heating time set to 3 minutes, the signal C is generated, so it is determined that the timer switch 27 is on. be done. The program then passes through step S31, which is similar to step S7, and then reaches steps S32 and S33. In step S32, signals A and C are output, the magnetron 15 starts to oscillate, microwave heating is started, and the relay switch 22 is turned on to start driving the timer motor 21. In step S33, signal E is output and the second light emitting diode 12 starts emitting light. Note that in this case, the first light emitting diode 11 does not emit light. The program then proceeds to step S34. In this step, it is determined whether the contents of the area ENCODE correspond to the 21st position of knob 7, and in this case, since the contents correspond to the 21st position, the program continues to S30. It reaches the S35 step, which is similar to the step. However, in this case, since the time has just been heated, the timer switch 27 is in the on state, and the program reaches step S36, which is similar to step S7. At this point, since the door 4 is closed, the program returns to step S34, and then cycles through steps S34 to S36 until the heating time of 3 minutes has elapsed and the timer switch 27 is turned off. (referred to as a loop).

When the heating time of 3 minutes has elapsed, the program exits the third loop at step S35 and proceeds to steps S37 to S39. In step S37, the output of the signals A and C is stopped, the oscillation of the magnetron 15 is stopped, the microwave heating is completed, and the driving of the timer motor 21 is also stopped. In step S38, the output of the signal E is stopped and the second light emitting diode 12 stops emitting light.
In step S39, the buzzer 35 sounds to notify the end of cooking, and at the same time, counting in area COUNT ₁ is stopped and its contents are cleared (not relevant since it is not currently being counted).
Thereafter, the program returns to step S1 and remains there.

Now, during the elapse of the above heating time of 3 minutes, that is, during the third heating period,
During loop circulation, when the door 4 is opened to season the food, the program exits the third loop at step S36 and proceeds to steps S40 to S42. S40 and S41 steps are respectively
This is the same as steps S37 and S38. In step S42, 1 is written to the temporary stop flag _FLG1 .
The program then returns to step S1. After that, season the food, close the door 4, press the start button 13 again, and the program will start.
From step S1, through steps S2, S26, S27, S30, and S31, steps S32 and S33 are reached, and the magnetron 15 oscillates, the timer motor 21
The driving of the second light emitting diode 12 and the light emission of the second light emitting diode 12 are restarted. Thereafter, the program passes through step S34 and enters the third loop.

[] Next, under 40% duty control (microwaves are oscillated for 10 seconds and stopped for 15 seconds at a cycle of 25 seconds), cooking is performed with a heating time of 5 minutes manually set by timer 9.

In this case, select and set knob 7 to the 22nd position. Then, from encoder 8, μCOM23
A signal [10111] (Fig. 2) for the 22nd position is input. This signal is for performing 40% duty control. After manually setting the heating time of 5 minutes by turning the knob 10 on the timer 9, the start button 13 is pressed. Then, the program goes through steps S1, S2-S5, S30-S33, and then S34.
In this case, the signal stored in the area ENCODE is [10111], so the program continues to step S43. In this step, up counting starts every second in the area COUNT ₁ . Next, the program is S44
step, but in that step the area
It is determined whether the contents of COUNT ₁ , that is, the count time is 10 seconds or more. However, in this case, since the count has just started, 10 seconds have not yet been reached, so the program reaches step S45. In this step, the area COUNT ₁
It is determined whether the count time has reached 25 seconds or not, but in this case, of course, it has not reached 25 seconds, so the program reaches step S35, and then steps S36.
After the step, return to step S34. after that,
The program continues from S34, S43 to S45, S35, until the count time in area COUNT ₁ reaches 10 seconds.
Each step of S36 is cycled through (hereinafter this process will be referred to as the fourth loop).

Therefore, when the above count time becomes 10 seconds,
The program exits the fourth loop at step S44 and reaches step S46. In this step, signal A
The output of the magnetron 15 is stopped, and therefore the oscillation of the magnetron 15 is stopped. After that, the program will continue to S34 until the above count time reaches 25 seconds.
Each step of S43, S44, S46, S45, S35, and S36 is cycled (this process is called the fifth loop).
When the count time reaches 25 seconds, the program exits the fifth loop at step S45 and proceeds to steps S47 and S48. At step S47, signal A starts to be output, and magnetron 1
The oscillation of 5 is restarted. Area in S48 step
Counting at COUNT ₁ is stopped and its contents are cleared to O. Thereafter, the program repeats the fourth and fifth loops until the heating time of 5 minutes has elapsed (this process is referred to as the sixth loop). Then, when the heating time of 5 minutes has elapsed, the program exits the 6th loop at step S35, and then
Steps S37 to S39 are reached, and the above cooking is therefore completed.

As is clear from the above description, according to the present invention, one selection means allows automatic cooking based on a plurality of predetermined cooking items and manual cooking in which desired heating time, heating temperature, etc. are independently set. Since you can select and set the settings according to the
It is possible to provide an electronically controlled cooker that can perform various types of cooking with good operability.

[Brief explanation of the drawing]

The figures show a microwave oven according to an embodiment of the present invention; Fig. 1 is a partially cutaway front view, Fig. 2 is an encoder output signal status diagram, Fig. 3 is a circuit diagram, and Figs. 4 A to D are microcomputer programs. flow chart,
FIG. 5 is a characteristic diagram of food temperature rise with respect to heating time. 7... knob, 8... encoder, 23... microcomputer.

Claims (1)

[Claims] 1. A selection means that is selectively set at a position corresponding to a desired cooking item among a plurality of cooking items, and an encoder that outputs a signal according to the selected position of the selection means, and based on the output signal of the encoder. In an electronically controlled cooker that automatically performs desired cooking, the selection means can be selectively set to a sub-position other than the position corresponding to the plurality of cooking items, and when the selection means is set to the sub-position, An electronically controlled cooking device characterized in that the encoder outputs a signal that allows manual setting of heating time, heating temperature, etc.