JPH0763338A - Heating cooker - Google Patents

Abstract

PURPOSE:To restrain effect to a cooking time or baking degree due to the ambient condition, variability and the like of a room temperature sensor by a method wherein a relative formula between a room temperature and a cooking time is set so as to be slanted slowly with respect to the relative formula of the optimum cooking time. CONSTITUTION:A control circuit 26 is provided with a cooking time setting means 28. A memory A 29 stores a given reference time (alpha) while a memory B 30 stores a changing time (beta), changed in accordance with a room temperature. A detecting circuit 31 converts an output signal of a room temperature sensor 17 into a digital signal while a correcting circuit 32 determines a correcting value based on the detecting temperature of the temperature sensor 17 and the information of a weight sensor 23. A cooking time determining circuit 33 determines a cooking time based on the combination of the reference time (alpha) and the changing time (beta). According to this method, the rate of the detecting temperature of the room temperature sensor 17 on the cooking time is reduced whereby effect of the ambient condition of the room temperature sensor 17, the variability of the sensibility of the room temperature sensor and the like to the cooking time or the degree of baking can be restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker for setting a cooking time based on the temperature detected by a room temperature sensor.

[0002]

2. Description of the Related Art Conventionally, there is a heating cooker such as a microwave oven having a toaster function. In this type of microwave oven, for example, the room temperature is 25 ° C.
In order to cook two toasts of 6 slices of bread left at room temperature, the cooking time was 370 from the experimental results.
Seconds are considered good (however, it depends on the model). Then, the cooking time for achieving a certain degree of baking is 375 seconds when the room temperature is 20 ° C, and 15 ° C.
In the case of, the optimum time is 380 seconds, and in the case of 30 ° C, the optimum time is 365 seconds.

As described above, since the optimum cooking time for achieving a certain degree of baking differs depending on the room temperature, the following equation (1) is set as the relational expression between the room temperature and the optimum cooking time:
The optimum cooking time is calculated and set from the equation (1) and the temperature detected by the room temperature sensor that detects the temperature of the environment in which the microwave oven body is installed.

F1 = F + (25−T0) (1) where F1: Optimum cooking time (seconds) F: Cooking time (seconds) at the standard room temperature (25 ° C.) T0: Temperature detected by the room temperature sensor (° C.) Then, in the equation (1), when F is set to 370 (seconds), F1 = -T0 +395 (2), and the relationship between room temperature and cooking time in this case is as shown in FIG. .

[0005]

By the way, the above relationship is a method of calculating the cooking time F1 on the assumption that the room temperature sensor detects a correct room temperature, and therefore the detected temperature T0 of the room temperature sensor is actually calculated for some reason. Even if it is slightly deviated from the room temperature, the cooking time and the baking condition will be relatively different from the correct case.

For example, when cooking is continuously performed, the temperature inside the machine room where the room temperature sensor is mounted is not completely cooled, or a relatively high temperature is placed near the room temperature sensor. , When the room temperature sensor is affected by the heat, the detected temperature T of the room temperature sensor
0 is higher than the actual room temperature. When the temperature T0 detected by the room temperature sensor is higher than the actual room temperature, the cooking time F1 is shortened more than necessary as a result of the correction by the equation (2), resulting in insufficient heating. Will end up. In addition, variations in the sensitivity of the room temperature sensor itself have a large effect on the cooking time and eventually on the baking condition, which may result in insufficient heating or excessive heating.

Therefore, the object of the present invention is to set the cooking time based on the temperature detected by the room temperature sensor. In this case, the influence of the surrounding condition of the room temperature sensor, the variation in the sensitivity of the room temperature sensor itself, etc., on the cooking time and the baking condition. It is to provide a heating cooker capable of suppressing the above.

[0008]

According to the present invention, there is provided a main body having a heating chamber, heating means for heating a food contained in the heating chamber, and a room temperature sensor for detecting the temperature of the environment in which the main body is installed. A cooking time setting means for setting the cooking time based on the temperature detected by the room temperature sensor, and the cooking time setting means sets the relational expression between the room temperature and the cooking time to a constant degree of baking according to the room temperature. It is characterized in that the slope is set so as to be gentle with respect to the set relational expression of the optimum cooking time forming a straight line.

Further, the cooking time setting means weakens the baking condition when the temperature detected by the room temperature sensor is lower than the reference room temperature with respect to the standard baking condition at room temperature, and the baking condition when the temperature is higher than the reference room temperature. The cooking time may be set to be stronger.

Further, the cooking time setting means combines a constant reference time with a change time that changes based on the temperature detected by the room temperature sensor, so that the cooking time is set to a constant linear condition according to the room temperature. The relational expression between the room temperature and the cooking time can be set so that the slope becomes gentle with respect to the relational expression of the optimum cooking time.

Further, the cooking time setting means shortens the optimum cooking time which is set so as to have a certain degree of baking according to the room temperature when the temperature detected by the room temperature sensor is lower than the reference room temperature, If it is high, the cooking time can be set by correcting it so that it becomes longer.

[0012]

According to the above means, the ratio of the temperature detected by the room temperature sensor to the cooking time is lower than that in the relational expression of the optimum cooking time. It is possible to suppress the influence on the cooking time and the baking condition due to variations and the like.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, in FIGS. 2 and 3 showing the overall configuration, a heating chamber 3 that is opened and closed by a rotatable door 2 is provided in a main body 1 of a microwave oven as a heating cooker, and the heating chamber 3 is also provided. Machine room 4 on the right side of
Is provided, and an operation panel 5 is provided on the front surface of the machine room 4.

On the side of the machine room 4 of the heating chamber 3, a magnetron 6 as heating means for supplying microwaves into the heating chamber 3.
And a hot air supply device 7 as a heating means for supplying hot air into the heating chamber 3 is provided at the back of the heating chamber 3. The hot air supply device 7 includes a hot air heater 8, a hot air fan motor 9, and a fan 10. Also,
An upper heater 11 and a lower heater 12, which also serve as heating means, are provided on the ceiling and bottom of the heating chamber 3.

A fan device 16 including a cooling fan motor 14 and a fan 15 is provided at the rear of the machine room 4 for cooling the magnetron 6 and the transformer 13 installed in the machine room 4. . Further, a room temperature sensor 17 for detecting the temperature of the environment in which the main body 1 is installed is provided in the front part of the machine room 4 (back part of the operation panel 5), and in the front part of the heating room 3, An internal sensor 18 for detecting the temperature inside the heating chamber 3 is provided. An exhaust duct 19 is provided on the left side of the heating chamber 3, and a gas sensor 20 and an alcohol sensor 21 are provided in the exhaust duct 19. Furthermore, at the bottom of the heating chamber 3, as shown in FIG.
An RT motor 22 for rotating the food contained in the heating chamber 3 and a weight sensor 23 for detecting the weight of the food.
Is provided.

The operation panel 5 is provided with various switches 24 for the user to select a cooking menu or to instruct the start of cooking, a display 25 for displaying cooking time, and the like. ing.

4, the control circuit 26 is configured to include a microcomputer and a memory, and the room temperature sensor 17 and the in-compartment sensor are provided on the input terminal side of the control circuit 26. 18, a gas sensor 20, an alcohol sensor 21, a weight sensor 22, and various switches 24 are connected, and a magnetron 6, a hot air heater 8, a hot air fan motor 9, an upper heater 11, is connected to an output terminal side via a drive circuit 27. The lower heater 12, the cooling fan motor 14, and the RT motor 22 are connected, and the display 25 is connected. The control circuit 26 has a control program, and based on the output signals of the various switches 24 and the sensors 17, 18, 20, 21, 23, the magnetron 6, the hot air heater 8, the hot air fan motor 9, and the upper heater 11 are provided. , Lower heater 12, cooling fan motor 1
4. It has a function of controlling the RT motor 22.

Further, as shown in FIG. 5, the control circuit 26 controls the room temperature sensor 1 especially when performing toaster cooking.
7 and the weight sensor 23, and has cooking time setting means 28 for calculating and setting the cooking time based on the information. The cooking time setting means 28 digitizes the output signal from the memory A 29 that stores a constant reference time α depending on the weight, the memory B 30 that stores the change time β that changes according to the room temperature, and the output signal from the room temperature sensor 17. Detection circuit 31
A correction circuit 32 that determines a correction value based on the temperature detected by the room temperature sensor 17 and information from the weight sensor 23; and a cooking time determination circuit 33 that determines the cooking time F2 by combining the reference time α and the change time β. It has a configuration having. That is, the cooking time determination circuit 33 determines that the cooking time F2
Is calculated by the following equation (3).

F2 = α + β (3) Next, the operation of performing toast cooking in the above configuration will be described with reference to FIG. When the toast cooking switch 24 is operated after the bread is stored as the food in the heating chamber 3 and the door 2 is closed, the cooking time F2 is first calculated and determined by the cooking time setting means 28 of the control circuit 26. .

Specifically, the weight sensor 23 detects the weight of the bread as the food, the number of the bread is determined by the weight, and the room temperature sensor 17 detects the temperature of the environment (room temperature). At this time, when the number of breads is two, the reference time α is set to 360 seconds, and the change time β is a linear expression of the room temperature T0 (-0.5).
× T0 +22.5), and the above equation (3) is represented by the following equation (4).

F2 = 360 + (− 0.5 × T0 + 22.5) (4) The relational expression between the room temperature T0 and the cooking time F2 is represented by the solid line in FIG. As is clear from FIG. 1, in the relational expression of the present embodiment, when the reference room temperature is 25 ° C.,
The cooking time F2 is set to 370 seconds,
The relational expression of the optimum cooking time F1 which has been optimum in the past intersects with the relational expression of the optimum cooking time F1 when the room temperature is 25 ° C., and the slope is gentle.

Then, the control circuit 26 controls the energization of the upper heater 11 and the lower heater 12 of the heating means, and heats the bread by the upper heater 11 and the lower heater 12.
The cooking time at this time is the heating time F2 determined from the above relational expression.

As described above, the room temperature T in this embodiment is
The relational expression between 0 and the cooking time F2 is as follows:
As compared with the relational expression (1), the inclination is gentler, so that the temperature T0 detected by the room temperature sensor 17 is less dependent on the cooking time F2. For this reason, it is possible to suppress the influence on the cooking time F2 and eventually the baking condition due to the ambient conditions of the room temperature sensor 17 and variations in the sensitivity of the room temperature sensor 17 itself.

Further, the relational expression between the room temperature T0 and the cooking time F2 in this embodiment is the temperature T detected by the room temperature sensor 17.
When 0 is lower than the standard room temperature (25 ° C), the cooking time is shorter than in the case of the relational expression of the optimum cooking time F1 set so that the baking condition becomes constant according to the room temperature. Therefore, the baking condition becomes weaker than the baking condition at the reference room temperature (25 ° C.), and the temperature T 0 detected by the room temperature sensor 17 becomes the reference room temperature (25 ° C.).
If the temperature is higher than ℃), the cooking time is longer than in the case of the relational expression of the optimum cooking time F1. Therefore, the baking condition is stronger than the standard room temperature (25 ° C). Will be.

FIG. 6 shows a second embodiment of the present invention, which is different from the above-mentioned first embodiment in the following points.
That is, the cooking time setting means 34 in the control circuit 26
Is a memory C storing the optimum cooking time F1 according to the weight.
35 and a memory D36 that stores a correction value according to the room temperature
A detection circuit 31 for digitizing the output signal from the room temperature sensor 17, a correction circuit 37 for determining a correction value based on the temperature detected by the room temperature sensor 17 and information from the weight sensor 23, an optimum cooking time F1 and a correction value. Cooking time F2
And a cooking time determination circuit 38 for determining.

In this case, the cooking time determination circuit 38 uses the temperature detected by the room temperature sensor 17 as a reference temperature (25
Temperature is lower than the optimum cooking time F1 by a correction value, the cooking time F2 is determined, and the temperature T0 detected by the room temperature sensor 17 is used as a reference room temperature (25 ° C). ), The cooking time F2 is determined so as to be longer than the optimum cooking time F1 by the correction value.

Also in the second embodiment, the same effect as that of the first embodiment can be obtained as a result.

In each of the above-mentioned embodiments, the case of toast cooking is illustrated, but the present invention can be applied to cases other than toast cooking.

[0029]

As is apparent from the above description, according to the present invention, the ratio of the temperature detected by the room temperature sensor to the cooking time is lower than that in the relational expression of the optimum cooking time.
It is possible to suppress the influence on the cooking time and the baking condition due to the surrounding conditions of the room temperature sensor and variations in the sensitivity of the room temperature sensor itself.

[Brief description of drawings]

FIG. 1 shows the first embodiment of the present invention, and is a diagram showing the relationship between room temperature and cooking time.

FIG. 2 is an overall perspective view of the appearance.

FIG. 3 is a schematic cross-sectional plan view.

FIG. 4 is a block diagram showing an electrical configuration.

FIG. 5 is a block diagram functionally showing a cooking time setting means portion of the control circuit.

FIG. 6 is a view corresponding to FIG. 5 showing a second embodiment of the present invention.

FIG. 7 is a view corresponding to FIG. 1 in a conventional example.

[Explanation of symbols]

1 is a main body, 3 is a heating chamber, 4 is a machine room, 6 is a magnetron (heating means), 7 is a hot air supply device (heating means), 11 is an upper heater (heating means), 12 is a lower heater (heating means),
Reference numeral 17 is a room temperature sensor, 26 is a control circuit, and 28 and 34 are cooking time setting means.

Claims (4)

[Claims] 1. A main body having a heating chamber, heating means for heating a food item contained in the heating chamber, a room temperature sensor for detecting a temperature of an environment in which the main body is installed, and a detected temperature of the room temperature sensor. And a cooking time setting means for setting the cooking time based on the above, wherein the cooking time setting means is a linear expression set so that the relational expression between the room temperature and the cooking time is a constant degree of baking according to the room temperature. A heating cooker characterized by being set so that its inclination is gentle with respect to the relational expression of the optimum cooking time. 2. A main body having a heating chamber, a heating means for heating the food contained in the heating chamber, a room temperature sensor for detecting the temperature of the environment in which the main body is installed, and a temperature detected by the room temperature sensor. And a cooking time setting means for setting a cooking time based on the above, wherein the cooking time setting means, when the temperature detected by the room temperature sensor is lower than the reference room temperature with respect to the baking temperature at the reference room temperature, The cooking device is characterized in that the cooking time is set so that the cooking temperature is weakened and the baking condition is strengthened when the cooking temperature is high. 3. A main body having a heating chamber, heating means for heating the food contained in the heating chamber, a room temperature sensor for detecting the temperature of the environment in which the main body is installed, and a temperature detected by the room temperature sensor. And a cooking time setting means for setting the cooking time based on the above, wherein the cooking time setting means adjusts a constant reference time and a change time that changes based on the temperature detected by the room temperature sensor to obtain a constant time according to the room temperature. For the relational expression of the optimum cooking time that makes a linear shape set to be the baking condition,
A heating cooker characterized by setting a relational expression between room temperature and cooking time so that the inclination becomes gentle. 4. A main body having a heating chamber, a heating means for heating the food contained in the heating chamber, a room temperature sensor for detecting the temperature of the environment in which the main body is installed, and a temperature detected by the room temperature sensor. And a cooking time setting means for setting a cooking time based on the cooking time setting means, wherein the cooking time setting means detects the temperature detected by the room temperature sensor with respect to the optimum cooking time set to have a certain degree of baking according to the room temperature. A cooking device characterized in that the cooking time is set so that the cooking time is shortened when the temperature is lower than the reference room temperature and is lengthened when the temperature is higher than the reference room temperature.