JP2994049B2 - Control device of cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a cooking device for heating food in a heating chamber by a heater.

[0003]

2. Description of the Related Art In a cooking device such as a microwave oven,
When cooking food such as cookies and butter rolls, the temperature inside the heating chamber is detected by a thermistor, and the heater is controlled to be cut off to maintain a substantially constant temperature. FIG. 6 shows temperature characteristics when a cookie is conventionally cooked.

That is, first, in a state in which no cookie material is stored in the heating chamber, a heater is energized to generate heat, thereby performing a preheating operation. Thereafter, when the temperature detected by the thermistor reaches the upper limit set temperature TU (time T1 or T2), the heater is turned off and the alarm is sounded.

[0005] Therefore, the cooking operation is started after the cookie material is stored in the heating chamber. Therefore, this time, the heater is repeatedly energized when the temperature detected by the thermistor reaches the lower limit set temperature TD, and cuts off when the temperature reaches the upper limit set temperature TU, so that the temperature in the heating chamber is maintained at approximately 170 ° C. You will be drooped.

Thereafter, when a set time Tc (for example, 15 minutes) elapses from time T1 or T2 when the temperature detected by the thermistor first reaches the upper limit set temperature TU (time T3 or T4), the heater is turned off and the cooking operation is started. Is terminated.

[0007]

In the conventional configuration, when the temperature of the thermistor is detected, if the power supply voltage is normal, the detected temperature of FIG.
, But when the power supply voltage is low,
This is shown by the two-dot chain line in FIG.

That is, when the power supply voltage is normal, the time T
a reaches the upper limit set temperature TU, and thereafter, twice (total of 3)
Times) When the power supply voltage is low while reaching the upper limit set temperature TU, the upper limit set temperature TU is reached in a time Tb longer than the time Ta, and thereafter the upper limit set temperature TU is only once (total two times). Does not reach.

As a result, in both cases, the temperature in the heating chamber is about 170 ° C. on average, but the fluctuation in the voltage changes the calorific value of the heater, and the degree of scorching on the surface of the cookie and the like. There was a problem that the cooking condition was different.

[0010] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a control device for a heating cooker which can constantly cook food in a stable condition.

[Structure of the Invention]

[0012]

According to the present invention, there is provided a control device for a cooking device, in which a heating chamber is preheated by a heater, and then the food is stored in the heating chamber and heated by the heater. , A temperature detecting means for detecting a temperature in the heating chamber is provided, and a preheating time until the temperature detected by the temperature detecting means reaches a set temperature is detected, and as the detection time increases, the energization ratio per unit time increases. The present invention is characterized in that a control means for causing the heater to execute the heating cooking in a heating pattern is provided.

[0013]

According to the control device of the heating cooker of the present invention, the longer the preheating time until the temperature detected by the temperature detecting means reaches the set temperature, the longer the power cutoff per unit time of the heater thereafter. Since the heating pattern in which the energization ratio is large is executed, the calorific value of the heater becomes substantially constant.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is applied to a microwave oven will be described below with reference to FIGS.

First, the overall configuration will be described with reference to FIG.
Reference numeral 1 denotes a main body, and 2 denotes a heating chamber provided in the main body 1. An upper heater 3 composed of a quartz tube heater and a lower heater 4 composed of a planar heater are disposed in the upper and lower parts of the heating chamber 2. Have been. A door 5 for opening and closing the front opening of the heating chamber 2 is attached to the front of the main body 1, and an operation panel 6 is attached to the right front of the main body 1.

In the operation panel 6, a display section 7 is provided at an upper end, and a number of menu setting keys, a start key, a reset key, a manual temperature setting key, and a manual time setting key are provided below the display section 7. A key operation unit 8 having the same is provided.

Reference numeral 9 denotes a thermistor as a temperature detecting means for detecting the temperature in the heating chamber 2. Although not shown, a magnetron for supplying high frequency into the heating chamber 2 and a fan for cooling the magnetron are arranged in the main body 1.

Now, the electrical configuration will be described with reference to FIG.
Reference numeral 10 denotes a microcomputer as control means, which has a ROM 11 as storage means. This ROM 11 contains
A program for executing various cooking operations is stored, and a plurality of heating patterns described later are stored. In the microcomputer 10, the thermistor 9 is connected to one input port,
A plurality of output terminals of the key operation unit 8 are connected to the plurality of input ports, and one output port is connected to the drive circuit 12.
Are connected to the upper and lower heaters 3 and 4 via a drive circuit 13 and another output port is connected to an alarm 14 such as a buzzer through a drive circuit 13.
And a plurality of output ports are connected to a plurality of input terminals of the display unit 7.

Next, the operation of this embodiment will be described with reference to FIGS. 1, 4 and 5.

When power is supplied to the microcomputer 10 (start), the microcomputer 10
In step S1 of "initialization", a predetermined initialization operation is performed, and a RAM, a preheating counter, and a cooking counter (not shown) are cleared. After that, the microcomputer 10 proceeds to a determination step S2 of “menu setting?”, In which the microcomputer 10 determines whether any menu setting key is pressed on the key operation unit 8 or not.
When the determination is "NO", the process returns to the determination step S2.

If the user presses the menu setting key of, for example, "cookie" of the key operation unit 8, the microcomputer 10 determines "YE" in the judgment step S2.
S ”, the process proceeds to step S3 of“ read upper and lower limit set temperatures ”, where“ cookie ”is read from ROM 11.
After cooking, the lower limit set temperature is read and stored in the RAM. Next, the microcomputer 10 proceeds to step S4 for determining "Start key operation?"
It is determined whether or not the start key has been pressed.
When the judgment is "O", the process returns to the judgment step S4.

When the user presses the start key of the key operation unit 8, the microcomputer 10 determines "YES" in the determination step S4, and proceeds to the output step S5 of "preheating operation". 4 is continuously energized. Thereby, the inside of the heating chamber 2 is heated, so that the preheating operation is performed. Further, the microcomputer 10
Becomes the processing step S6 of "start of preheating counter", starts the counting operation of the preheating counter, and shifts to the determination step S7 of "upper limit setting temperature?"

The microcomputer 10 determines in step S7 that the temperature detected by the thermistor 9 is equal to the upper limit set temperature TU.
Is determined, and if "NO", the determination step S7 is repeated. Thereafter, when the temperature inside the heating chamber 2 rises and the detected temperature of the thermistor 9 reaches the upper limit set temperature TU (time T1), the microcomputer 10
In the judgment step S7, "YES" is judged, and the processing step S8 is "stop of preheating operation, stop of preheating counter". The microcomputer 10 executes this processing step S
At 8, the upper and lower heaters 3 and 4 are turned off, and the counting operation of the preheating counter is stopped. Then, the microcomputer 10 causes the annunciator 14 to perform a sounding operation in the next processing step S9 of “informing operation” to notify that the preheating operation has ended.

Further, the microcomputer 10 shifts to the processing step S10 of "reading of the power cut condition" and performs the following processing. That is, the microcomputer 10
Is the time from the count value of the preheating counter until the temperature detected by the thermistor 9 reaches the upper limit set temperature TU (preheating time
Interval ) Td is detected, and the ROM 11 is detected based on the detected time Td.
One of the heating patterns shown in FIG. 5 stored in advance is selected and read out. For example, when the detection time Td is in the range from 4 minutes 30 seconds to 4 minutes 49 seconds, it is determined to be “standard” and “23 seconds energization (ON) and 7 seconds power cut (OFF) during the unit time of 30 seconds. Is selected and written and stored in the RAM.

In the above case, when the detection time Td is shorter than the range of 4 minutes 30 seconds to 4 minutes 49 seconds of the "standard", the microcomputer 10 determines that the detection time is "strong" and turns on the power in accordance with the degree. Select a heating pattern of "21 seconds energization and 9 seconds interruption" or "19 seconds energization and 11 seconds interruption" with a small ratio. If the heating pattern is larger than the "standard" range, it is judged as "weak" Then, a heating pattern of “25-second energization and 5-second interruption”, “27-second energization and 3-second interruption”, or “29-second energization and 1-second interruption” with a large energization ratio is selected according to the degree. . And the microcomputer 10
The process proceeds to the next step S11 of “start key operation?”, And if “NO” is determined here, this determination step S11 is repeated.

The user knows the end of the preheating operation by the sound of the alarm 14 and stores the cookie material as a food in the heating chamber 2 and presses the start key of the key operation section 8 again. . Thereby, the microcomputer 10
Determines "YES" in the determination step S11, and executes the "heating time calculation, cooking counter start" processing step S1.
Move to 2. Here, the microcomputer 10 detects the weight of the cookie material stored in the heating chamber 2 by a weight sensor (not shown), and determines a heating time (for example, 15 minutes to 17 minutes) according to the weight. Calculation, the calculation result is set in the cooking counter, and the display unit 7
, And the counting operation of the cooking counter is started.

Thereafter, the microcomputer 10
The process proceeds to step S13 for determining “lower limit set temperature?”
Here, it is determined whether or not the detected temperature of the thermist 9 has reached the lower limit set temperature TD. If “NO” is determined, the determination step S13 is repeated. If “YES” is determined (time T2), “ Output step S1 of "cooking operation"
At 4, the heaters 3 and 4 are turned off and on according to the heating pattern stored in the RAM. That is, as described above,
The heaters 3 and 4 are set for a set time (for example, 15 minutes to 1
7 minutes), the energization for the time Te and the interruption for the time Tf stored in the RAM are repeated, for example, “standard”.
At the time of energization, energization for 23 seconds, which is the time Te, and 7 times, which is the time Tf,
Second power interruption is repeated.

Then, the microcomputer 10
This is a determination step S15 of "end?", In which it is determined whether or not the cooking counter has counted up. If "NO", this determination step S15 is repeated. Thereafter, when the cooking counter counts up and the cooking is completed, the microcomputer 10 determines “ YES” in the determination step S15 and proceeds to the processing step S16 of “end processing”, in which the upper and lower heaters 3 and 4 are turned off. At the same time, each counter is cleared, and the alarm 14 is sounded for a short time, thereby ending the operation (end).

As described above, according to the present embodiment, the microcomputer 10 detects the time Td until the temperature detected by the thermistor 9 reaches the upper limit set temperature TU, and stores the time Td in the ROM 11 based on the detected time Td. Since the heaters 3 and 4 select an optimal heating pattern from a plurality of heating patterns having different energization ratios and cause the heaters 3 and 4 to execute the heating pattern, the power supply voltage of the heaters 3 and 4 fluctuates and the heaters 3 and 4 generate heat. Even if the capacity changes, the amount of heat generated per unit time becomes substantially constant, and the effect of the radiant heat on the food cookie becomes substantially constant, so that the degree of scorching of the cookie surface becomes substantially uniform. Become stable.

The above control can also deal with differences in heat generation capacity due to manufacturing variations of the heaters 3 and 4, variations in heat radiation in the heating chamber 2, or differences in ambient temperature.

In the above embodiment, a plurality of heating patterns having different energization ratios are stored in the ROM 11 in advance. However, for example, a heating pattern having a standard energization ratio is stored in the ROM 11 so that the detection time Td Accordingly, a heating pattern having a different energization ratio may be obtained from the heating pattern by calculation.

In addition, the present invention is not limited to the embodiment described above and shown in the drawings. For example, the present invention is applicable not only to a microwave oven but also to a general cooking device using a heater. Needless to say, the present invention can be modified and implemented as appropriate.

[0033]

As described above, the control device of the cooking device according to the present invention, as described above, changes the heating pattern in which the heater is energized differently according to the preheating time until the temperature detected by the temperature detecting means reaches the set temperature. Therefore, the present invention has an excellent effect that food can be cooked to a stable degree even if the power supply voltage fluctuates .

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating an operation of an embodiment of the present invention.

FIG. 2 is an overall perspective view.

FIG. 3 is an electrical configuration diagram

FIG. 4 is a temperature characteristic diagram for explaining the operation.

FIG. 5 is an explanatory diagram of a heating pattern stored in a ROM.

FIG. 6 is a diagram corresponding to FIG. 4 of a conventional example.

[Explanation of symbols]

1 is a main body, 2 is a heating chamber, 3 is an upper heater, 4 is a lower heater,
8 is a key operation unit, 9 is a thermistor (temperature detection means), 1
0 is a microcomputer (control means), 11 is a ROM
Is shown.

Claims (1)

(57) [Claims] After the heating chamber is preheated by a heater,
In the one in which food is accommodated in the heating chamber and heated by a heater, a temperature detecting means for detecting a temperature in the heating chamber, and a preheating time until the temperature detected by the temperature detecting means reaches a set temperature is detected. A control device for a heating cooker, comprising: control means for causing the heater to perform heating cooking in a heating pattern in which the energization ratio per unit time increases as the detection time increases.