JPH07280280A - Heating and cooking device - Google Patents

Abstract

PURPOSE:To improve a setting accuracy of a heating and cooking time and concurrently to reduce data for use in setting heating and cooking time. CONSTITUTION:A control device 24 is operated such that a temperature within a heating and cooking chamber is detected by a temperature sensor 7 when a heating and cooking is completed, the detected temperature is stored in a nonvolatile memory 28, a temperature within the heating and cooking chamber is detected also when the heating and cooking are started and then the heating and cooking time is set in response to the detected temperature of the present time (the temperature when the heating and cooking are started) and a stored detected temperature of the previous time (the temperature when the heating and cooking are finished).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention comprises a temperature detecting means,
The present invention relates to a heating cooker in which a heating cooking time is set based on the detection result of the temperature detecting means.

[0002]

2. Description of the Related Art Conventionally, there is known a heating cooker, such as a toaster, in which heating (baking) is performed for a set time based on a user's time setting. However, in this one, when the cooking is continuously performed, the bread is overbaked because the initial temperature in the cooking chamber is considerably high in the second and subsequent cooking. There was an occasion.
As a countermeasure, there are the following.

(A) A temperature sensor for detecting the temperature inside the heating / cooking chamber is provided, and the temperature inside the heating / cooking chamber is detected by this temperature sensor at the start of heating and cooking. The higher the detected temperature, the shorter the heating / cooking time is set. To do.

(B) The time from the end of the previous cooking to the start of cooking this time, that is, the interval time is measured, and the shorter the interval time, the shorter the cooking time is set.

[0005]

However, in the conventional apparatus (a) described above, when the cooking is started immediately after the door of the cooking chamber is opened and closed, the residual temperature in the cooking chamber is reduced. There is also a situation in which the temperature detected by the temperature sensor is low even though it is still high, and in this case, there is a problem that the heating and cooking time is set long even though it should be set short.

In the conventional type (b), the time when the next cooking is started varies, and the number of times the cooking is continuously performed may be small. There are many cases. Therefore, the temperature at the end of heating and cooking must be predicted to be quite high, and the time required for the temperature to drop from this predicted temperature to room temperature is extremely long. Therefore, it is necessary to predict the interval time considerably long. There is also a problem that the amount of setting data for the cooking time required from the time is extremely large and the capacity of the memory for storing the setting data is large.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the setting accuracy of the cooking time and to store data without requiring much setting data for setting the cooking time. It is an object of the present invention to provide a heating cooker that does not require a large storage capacity in the means.

[0008]

[Means for Solving the Problems] A first means is a heating means for heating an object to be cooked contained in a heating cooking chamber, and a temperature detecting means for detecting the temperature of the heating cooking chamber.
Temperature storage means for storing the temperature detected by the temperature detection means at the end of heating and cooking, data storage means for storing setting data for setting the cooking time, and heating by the temperature detection means at the start of heating and cooking. A heating cooking time setting means for detecting the temperature of the cooking chamber and setting a heating cooking time based on the detected temperature of this time, the detected temperature stored in the temperature storage means, and the setting data of the data storage means; , And operation control means for executing the heating and cooking operation at the heating and cooking time set by the heating and cooking time setting means.

The second means is a heating means for heating the food to be heated contained in the heating and cooking chamber, a temperature detecting means for detecting the temperature of the heating and cooking chamber, and the temperature at the end of the heating and cooking. A temperature storage unit that stores the temperature detected by the detection unit, a data storage unit that stores setting data for setting the cooking time, and a temperature detection unit that detects the temperature of the cooking chamber at the start of cooking. At the same time, when the detected temperature of this time is equal to or lower than the predetermined temperature, the cooking time is set to a fixed time, and when the detected temperature of this time exceeds the predetermined temperature, the detected temperature of this time and the temperature are stored in the temperature storage means. Heating cooking time setting means for setting the heating cooking time based on the detected temperature and the setting data of the data storage means, and the heating cooking time set by the heating cooking time setting means Configured to include an operation control means for performing a cooking operation at.

In the third means, in the first or second means, the heating cooking time is set. As the detected temperature is higher this time, the heating cooking time is shortened and the detected temperature stored in the temperature storage means is higher. The heating and cooking time is set shorter.

[0011]

When the heating cooking is started, the temperature in the heating cooking chamber is low in the first heating cooking and increases as the number of times of the heating cooking increases, but only the temperature at the beginning of the heating cooking is increased. To set the cooking time with a little less reliable. However, when the temperature in the heating cooking chamber at the end of heating cooking is observed, it tends to be low in the first heating cooking and increase as the number of times of heating cooking increases.

In the first means, the temperature detected by the temperature detecting means is stored at the end of heating and cooking, and the temperature of the heating and cooking chamber is detected by the temperature detecting means at the beginning of heating and the current detection is performed. Since the cooking time is set on the basis of the temperature, the stored detected temperature, and the setting data stored in the data storage means, the accuracy of setting the cooking time is improved. Further, since the interval time is not an element for setting the cooking time, the data storage means does not need a large storage capacity.

By the way, at the start of cooking, if the cooking is the first one or if the elapsed time from the previous cooking is considerably long, the temperature in the cooking chamber also becomes normal temperature. Further, even if the temperature is not room temperature, it is often not necessary to change the heating and cooking time when the temperature is low to some extent.

In the second means, however, the heating and cooking time is set to a fixed time when the detected temperature at the start of the present heating and cooking is equal to or lower than the predetermined temperature. Therefore, the heating and cooking time is not changed. It is not necessary to perform variable control of cooking time, which simplifies control. When the detected temperature exceeds a predetermined temperature,
Since the cooking time is set based on the detected temperature and the detected temperature stored in the temperature storage means and the setting data stored in the data storage means this time, when performing variable control of the cooking time, The accuracy of setting the cooking time is improved. In this case, since the interval time is not an element for setting the cooking time, the data storage means does not need a large storage capacity.

In the third means, the heating and cooking time is set so that the heating and cooking time is shortened as the current detected temperature is higher and the heating and cooking time is shortened as the previous detected temperature is higher. , Underheating and overheating disappear.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a microwave oven having a toaster function will be described below with reference to the drawings. FIG. 2 shows a schematic configuration of a microwave oven. Inside the main body 1, an inner box 3 having a heating and cooking chamber 2 inside is arranged. A magnetron 4 is provided on the outer surface of the inner box 3, and microwaves generated by the magnetron 4 are supplied to the heating and cooking chamber 2. Further, an upper heater 5 as a heating means is provided on the upper surface of the inner box 3, and a lower heater 6 as a heating means is also provided on the lower surface. Further, a temperature sensor 7 as a temperature detecting means is arranged on the inner side surface of the inner box 3, and a turntable 9 which is also driven by a motor 8 and also serves as a grill is arranged at the bottom.

On the other hand, as shown in FIG. 3, a door 13 for opening and closing the cooking chamber 2 is provided on the front surface of the main body 1, and an operation panel 14 is provided on the right side of the door 13. ing. The operation panel 14 is provided with a cooking selection switch 15 including a cooking selection means switch 15a for toasting bread serving as a food to be heated, and a start switch 16 serving as heating and cooking start means. A display 17 for displaying the state is provided.

FIG. 1 shows an electric circuit configuration. In FIG. 1, the magnetron 4 is connected to a high voltage transformer 19 via a rectifier circuit 18 composed of, for example, a voltage doubler rectifier circuit, and an AC power supply to the high voltage transformer 19 is provided. 20 supplies
It is controlled by the relay switches 21 and 22. The supply of the AC power supply 20 to the upper heater 5 is controlled by the relay switches 21 and 22 and another relay switch 23, and the supply of the AC power supply 20 to the lower heater 6 is controlled by the relay switches 21 and 22. It is supposed to be done.

The relay switches 21 to 23 are controlled by the controller 24. The control device 24 includes a microcomputer and various A / Ds.
It is configured to include a converter and the like. Signals from the temperature sensor 7, various switches 15 and start switch 16 are input to the control device 24. The control device 24 controls the relay switches 21 to 23 through the NPN transistors 25 to 27 based on those signals and a program stored in advance. In addition, the control device 24
Has a ROM as a data storage means therein,
A non-volatile memory 28 is provided as a temperature storage means.

The control device 24 functions as heating and cooking time setting means and operation control means, which will be described below with reference to the flow chart of FIG. This flow chart is started when the "toast" cooking is selected by the switch 15a and the start switch 16 is operated.

In step S1, the display 17 indicates that the "toast" cooking course is in operation, and the upper heater 5 and the lower heater 6 are energized. Then, as shown in step S2, the detected temperature from the temperature sensor 7 is read, and as shown in step S3, the detected temperature data at the end of the previous cooking is read from the nonvolatile memory 28.

Then, as shown in step S4, the detected temperature and the detected temperature data of the non-volatile memory 28,
The cooking time is set on the basis of the setting data for setting the cooking time described below. Setting data for setting the cooking time is stored in advance in a ROM (not shown) which is a data storage unit in the control device 24, and the stored contents are shown in Table 1.

[0023]

[Table 1]

That is, the detected temperature (detected temperature data) at the end of the previous cooking is "70 ° C or lower", "71 ° C to 1".
00 ° C "," 101 ° C-140 ° C "," 141 ° C-19 "
0 ° C ”and“ 191 ° C or higher ”are classified into ranks, while the detected temperature at the start of cooking this time is“ 50 ° C or lower ”,
"51 ° C to 70 ° C", "71 ° C to 100 ° C", "101
"C-130C", "131C-160C", "161C"
~ 190 ° C "and" 191 ° C or higher ", and when the detected temperature at the start of cooking this time is" 50 ° C "which is a predetermined temperature or less, the heating cooking time is set to a certain time, for example" 270 ".
Seconds ". This "50 ° C" and a certain time "270
The purpose of the setting of "second" is that when the temperature inside the heating / cooking room 2 is 50 ° C or lower, it can be determined that there is no residual heat remaining inside. This is where variable control is omitted.

If the detected temperature at the start of cooking this time exceeds the above "50 ° C", the heating cooking time is divided into ranks according to the rank of the detected temperature at the end of the previous cooking. The settings are made as shown in the table. In this embodiment, the higher the detected temperature at the start of cooking this time, the shorter the cooking time, and the higher the previously detected temperature, the shorter the cooking time.

The reason why the detected temperature (detected temperature data) at the end of the previous cooking is ranked in a wide range from a relatively low temperature to a high temperature is that the heating by the heaters 5 and 6 is usually performed at the end of cooking. The temperature in the cooking chamber 2 is high, but the heating by the magnetron 4 does not raise the temperature in the heating chamber 2 itself as much as the heating by the heater, but the temperature state of about 70 ° C. is still expected. . Further, the non-volatile memory 28 stores in advance, for example, a value of about room temperature (about 30 ° C.) as an initial value of the temperature at the end of cooking.

After the heating and cooking time is set based on Table 1, time counting is started as shown in step S5, and when this set time has elapsed (step S6
Determination), as shown in step S7, the temperature sensor 7
The detected temperature from is read and stored in the non-volatile memory 28 as detected temperature data, and the upper heater 5 and the lower heater 6 are turned off, thereby ending the cooking.

During such heating and cooking control, the bread, which is the food to be heated, placed on the turntable 9 is
After heating by the upper and lower heaters 5 and 6 and the set cooking time has elapsed, this heating is completed and the baking state is established.

Next, when cooking is continuously performed,
Since the detected temperature at the end of the previous cooking and the detected temperature at the start of the cooking this time become higher, the cooking time is set shorter in sequence. In this way, when the residual heat is present in the cooking chamber 2, the cooking time is set to be short, so that the bread is appropriately baked without being overheated.

According to this embodiment, the temperature inside the cooking chamber 2 is detected at the end of heating and the detected temperature is stored in the non-volatile memory 28.
The temperature in the cooking chamber 2 is detected, and the detected temperature at this time (the temperature at the start of heating and cooking), the detected temperature at the previous time (the temperature at the end of heating and cooking), and the R of the control device 24 as the data storage means.
Since the cooking time is set based on the setting data stored in the OM, the accuracy of setting the cooking time is improved. Further, since the interval time is not an element for setting the cooking time, the control device 2 which is a data storage means.
4 does not require a large storage capacity in ROM.

By the way, at the start of cooking, if this cooking is the first one or if the elapsed time from the previous cooking is considerably long, the temperature in the cooking chamber is also at room temperature. Further, even if the temperature is not room temperature, it is often not necessary to change the heating and cooking time when the temperature is low to some extent.

According to this point, particularly, according to this embodiment, when the detected temperature at the start of the current cooking is below the predetermined temperature (50 ° C.), it is determined that there is no residual heat remaining in the cooking chamber 2. That is, since it is determined that the variable control of the cooking time is not necessary and the cooking time is set to a fixed time, the variable control of the cooking time is not wastefully performed, thereby simplifying the control. . When the detected temperature exceeds a predetermined temperature, as described above, based on the detected temperature at the start of the current cooking, the detected temperature at the end of the previous cooking and the setting data stored in the ROM. Since the heating and cooking time is set, when the heating and cooking time is variably controlled, the accuracy of setting the heating and cooking time is improved as described above.

Further, in the present embodiment, the heating cooking time is set based on the detected temperature at the start of the current cooking and the detected temperature at the end of the previous cooking, and the higher the detected temperature at this time, the more the cooking becomes. Since the heating time is set to be shorter as the time is shortened and the previously detected temperature is higher, it is possible to surely eliminate insufficient heating and excessive heating. Further, since the non-volatile memory 28 is provided as the temperature storage means, the detected temperature at the end of the previous cooking can be stored even if the power is interrupted or the plug is unplugged from the outlet, which hinders the setting of the cooking time. There is nothing to do.

[0034]

As is apparent from the above description, the present invention can obtain the following effects. According to the invention of claim 1, at the end of heating cooking, the temperature inside the heating cooking chamber is detected and the detected temperature is stored in the data storage means, and at the start of heating cooking, the temperature inside the heating cooking chamber is also detected. The cooking time is set based on the detected temperature (the temperature at the start of cooking), the previously detected temperature (the temperature at the end of cooking) and the setting data stored in the data storage means. It is possible to improve the setting accuracy of
Since the interval time is not an element for setting the cooking time, the data storage means does not need a large storage capacity.

According to the second aspect of the present invention, the heating cooking time is set to a constant time when the detected temperature at the start of the current heating cooking is equal to or lower than the predetermined temperature. It is not necessary to perform variable control of the cooking time, which simplifies the control, and when the detected temperature exceeds a predetermined temperature,
Similarly to the above, the heating cooking time is set based on the detected temperature at the start of the current cooking, the detected temperature at the end of the previous cooking and the setting data stored in the data storage means. The accuracy can be improved.

According to the invention of claim 3, the heating and cooking time is set such that the heating and cooking time is shortened as the detected temperature at this time becomes higher and the heating and cooking time is shortened as the detected temperature at the previous time becomes higher. Therefore, insufficient heating and excessive heating can be reliably eliminated.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of the present invention.

FIG. 2 is a vertical sectional front view showing a schematic configuration of a microwave oven.

FIG. 3 is a perspective view.

FIG. 4 is a flowchart showing control contents.

[Explanation of symbols]

2 is a cooking chamber, 5 is an upper heater (heating means), 5 is a lower heater (heating means), 7 is a temperature sensor (temperature detection means),
Reference numeral 24 is a control device (heating and cooking time setting means, operation control means, data storage means), and 28 is a non-volatile memory (temperature storage means).

Claims (3)

[Claims] 1. A heating means for heating an object to be heated housed in a heating cooking chamber, a temperature detecting means for detecting a temperature of the heating cooking chamber, and a detection by the temperature detecting means at the end of heating cooking. A temperature storage means for storing the temperature, a data storage means for storing the setting data for setting the cooking time, and a temperature detecting means for detecting the temperature of the cooking chamber at the time of starting the cooking, and Heating cooking time setting means for setting a heating cooking time based on the detected temperature, the detected temperature stored in the temperature storing means, and the setting data in the data storing means; and the heating cooking time setting means. A heating cooker comprising: an operation control unit that executes a heating and cooking operation during a heating and cooking time. 2. A heating means for heating an object to be cooked contained in the heating and cooking chamber, a temperature detecting means for detecting the temperature of the heating and cooking chamber, and a detection by the temperature detecting means at the end of the heating and cooking. A temperature storage means for storing the temperature, a data storage means for storing the setting data for setting the cooking time, and a temperature detecting means for detecting the temperature of the cooking chamber at the time of starting the cooking, and When the detected temperature is equal to or lower than the predetermined temperature, the heating and cooking time is set to a fixed time, and when the detected temperature of this time exceeds the predetermined temperature, the detected temperature of this time and the detected temperature stored in the temperature storage means Heating and cooking time setting means for setting the heating and cooking time based on the setting data of the data storage means, and heating at the heating and cooking time set by the heating and cooking time setting means Cooking device comprising a driving control means for executing management operation. 3. The heating-cooking time setting means sets the heating-cooking time such that the heating-cooking time is shortened as the current detected temperature becomes higher, and the heating-cooking time becomes shorter as the detected temperature stored in the temperature storage means becomes higher. The cooking device according to claim 1, wherein the cooking device is set to