JP2589166B2 - Cooker - Google Patents

Description

The present invention relates to a heating cooker such as an oven toaster.

(B) Conventional technology Usually, for example, when heating is performed several times continuously in an oven toaster, the temperature of the heating chamber at the start of heating is 1%.
Even if heating the same menu is continued, it will not be in a uniform finished state in the same heating time even if heating is continued for the second and subsequent times.For example, when baking a toast, the temperature in the heating chamber at the start of heating will be at room temperature. Even if the first optimal heating time is 3 minutes, since the heating chamber temperature has already become high at the start of the second heating, the same 3
If it is heated for a minute, it will be in an overbaked state.

In Japanese Patent Application Laid-Open No. 58-78490, an attempt is made to solve the above-described problem by storing the number of times of continuous heating and shortening the actual heating time from the set heating time in accordance with the increase in the number of times of heating. However, in such a configuration, 1
Since the non-heating time from the end of the second heating to the start of the second heating is not taken into account, the variation in the temperature of the heating chamber due to the length of the non-heating time cannot be corrected, and the heating finish may be excessive or insufficient. .

On the other hand, the applicant of the present application calculates a correction value according to the current heating time and the non-heating time after the completion of the heating, and calculates the next heating time based on the correction value as disclosed in Japanese Patent Application No.
-274075. According to this, it is possible to correct the heating time with respect to the length of the non-heating time, but in this non-heating time, the door of the heating chamber is often opened and closed to take out and out of food, and the number of times the door is opened and closed, The degree of decrease in the temperature of the heating chamber during the non-heating time also changes depending on the time. For example, if the opening time of the door is long, the temperature of the heating chamber rapidly decreases, and the heating may be insufficient during the next heating. Further, the decrease in the heating chamber temperature during the non-heating time is also affected by the ambient temperature.

(C) Problems to be Solved by the Invention The present invention is not limited to the length of the current heating time, the length of the time until the next heating is started, the open / closed state of the door in the non-heating time, and the ambient temperature. The purpose is to provide a finished heating cooker.

(D) Means for Solving the Problems The heating cooker of the present invention comprises a heating chamber, a heating source, a door for opening and closing the heating chamber, an opening and closing detecting means for detecting the open / closed state of the door, and an ambient temperature. , A time setting means for setting a basic heating time, an adding means for adding and calculating a correction value according to the current heating time, and a non-heating time from the end of the current heating to the start of the next heating. Subtraction means for subtracting and correcting the correction value according to the ambient temperature of the heating time and the opening / closing state of the door; and calculating the next heating time by correcting the basic heating time by the correction value subtracted and corrected by the subtraction means. Time calculating means.

(E) Action The correction value added during the current heating is subtracted and corrected according to the non-heating time from the end of the current heating to the start of the next heating, the ambient temperature, and the open / closed state of the door. By correcting the basic heating time, the next heating time is calculated.

(F) Example The drawings show an embodiment of the oven toaster of the present invention,
(1) a main body having a heating chamber (10) formed therein;
(2) a door for opening and closing the opening of the heating chamber (10), (3)
Is an operation panel provided on the front of the main body (1). The operation panel is provided with a display section (4) for displaying the remaining heating time and the like and a plurality of key switches (5) for specifying a heating menu. A heater (6) is provided in the heating chamber (10) as a heating source for heating food stored in the heating chamber.

FIG. 2 shows a circuit block diagram, and (7) shows a heater (6) with reference to menu information input from the key switch (5) and heating information stored in a memory (8).
(Hereinafter referred to as a microcomputer) for controlling the display and the display unit (4), (9) a driving circuit comprising a relay or the like for driving the heater (6), and (11) a latch (11) for the door (2). (Not shown), a door switch as an open / close detecting means for detecting the open / closed state of the door (2), and (12) a temperature measuring element such as a thermistor and an amplifier for amplifying the output signal thereof. The main body (1) is a temperature measuring means for measuring the temperature around the periphery.

FIG. 3 shows a flowchart of a control program incorporated in the microcomputer (7), which will be described below. still,
Here, T ₁ , T ₂ , and A are variables representing time (unit: second), and TE is a variable representing temperature (unit: ° C.). S1 when power is supplied
Reset the memory and CPU, variable T ₂ , flag BSY
Is set to 0, and the process proceeds to S2. In S2, the display unit (4) is controlled, and the current time is displayed when heating is not performed, and the remaining heating time is displayed during heating. Subsequently, in S3, a key scan is performed to determine the presence or absence of a key input, and in S4, it is determined whether or not a toast key has been input.

The (referred to hereafter as H _1, similarly to the second heating between H ₂ referred) first and toast heating proceeds from the entering toast key for starting S4 to S5, S5 corresponds to the time setting means, here as ideal fundamental heating time to toast heating reading the 180 seconds stored in the memory (8) as T _1. Continued S6 corresponds to the time calculating means, correcting by subtracting the correction value T ₂ from T _1, and the remaining heating time A. Since the H ₁ at the start T ₂ is at 0 A 180, and this A is displayed on the display unit (4) in S7, the start of the energization of the heater (6) The flag BSY as 1 in S8.

During the heating, the measurement result of the outside air temperature is obtained as a variable TE in a loop of S2, S3, S9, and S10. During the heating, S9 and S11 to S15 are executed every one second since BSY is 1. S12, S13 corresponds to adding means, the correction value T ₂ adds up to 90 by 3 per second depending on the heating time. In S14, remaining heating time A
Then, it is determined whether or not the remaining heating time becomes 0 in S15.

T ₂ are reached a maximum of 90 in the course of H _1, the heating chamber (10) temperature at that time is in a state of completely elevated. Then, after the set heating time has elapsed, in S15, A ≦ 0
Advances to S16 when a turns off the power to the heater (6), and ends the H ₁ 0 the BSY causes the buzzer. Then, subsequently to prepare the H ₂ to perform opening and closing of the door (2), although the work such as out of bread is performed, H ₁ ends at the same time as the heating chamber (10) temperature starts to decrease, at the same also starts the correction value T ₂ the temperature reflecting the subtraction simultaneously. Moreover the speed of the heating chamber (10) temperature drop can be influenced by the temperature close state and around the door (2), the subtraction also T ₂ by subtracting means, the opening and closing state and surrounding the door (2) Temperature It is performed according to. That is, the door (2) closed but the rate of decrease in the heating chamber (10) temperature is low, less 0.8 Subtraction per second of T ₂ of the this time. When the door (2) is opened, the temperature of the heating chamber (10) decreases slowly when the ambient temperature is high and fast when the ambient temperature is low.
Subtraction also T _2, depending on the temperature measurement result TE in S10, less when the ambient temperature is high, is often at low. By thus one corresponding subtraction T ₂ to open and ambient temperature of the door (2), the value of T ₂ are made as reflecting better heating chamber (10) temperature. Incidentally, the T ₂ becomes zero or less by the subtraction, the process proceeds from S17 to S25, T ₂ is zero. At this time, the temperature of the heating chamber (10) has dropped to almost room temperature.

And Thus, although the process proceeds to to S6 earlier as well as S4 and instructs the start of H ₂ Press toast key again, the present invention increases with during H ₁ execution time, during the non-heating time heating chamber decreases with (10) the temperature was expressed by T ₂ is the correction value, the second by subtracting the T ₂ from the basic heating time T ₁ in S6
The second heating time is calculated. Therefore, the heating time of H ₂ is substantially shortened as the temperature of the heating chamber (10) at that time is higher, and even when several heatings are continuously performed, the heating after the second heating does not become overheating. Good,
In particular, when roasting of the same menu such as toast is performed continuously, a uniform heated finish is always obtained. Moreover, the subtraction of the correction value T ₂ are, since it is made on the basis of the repeated temperature measurements made (S10) and door opening and closing determination (S18), even if they are changed during the non-heating time accordingly subtraction is performed , the value of T ₂ are made as reflecting better heating chamber (10) temperature.

Note that the program in the above embodiment, the value of the constant and the calculation formula in the program, the size of the cooker to be implemented, the calorific value,
It is desirable to make various changes according to the heat radiation speed and the like.

(G) Effects of the Invention According to the present invention, when heating is performed several times continuously, the heating time after the second heating is changed to the previous heating time, the non-heating time from the end of the previous heating to the start of the current heating. Since the correction is made according to the ambient temperature and the opening / closing state of the door, optimal heating can be performed without being affected by these factors, and when heating the same menu is repeated, the individual heating states can be made uniform and excellent. .

[Brief description of the drawings]

The drawings show one embodiment of the present invention, and FIG.
FIG. 2 is a circuit block diagram, and FIG. 3 is a flowchart showing control. (2) ... door, (6) ... heater, (7) ... microcomputer, (8) ... memory, (10) ... heating room, (11) ...
Door switch, (12) ... measuring means.

Claims (1)

(57) [Claims] 1. A heating chamber, a heating source, a door for opening and closing the heating chamber, open / close detection means for detecting the open / closed state of the door, temperature measurement means for measuring an ambient temperature, and a basic heating time are set. Time setting means, addition means for adding and calculating a correction value according to the current heating time, and non-heating time from the end of the current heating to the start of the next heating, the ambient temperature of the non-heating time, and the open / close state of the door. Heating means for subtracting and correcting the correction value, and time calculating means for correcting the basic heating time with the correction value subtracted and corrected by the subtraction means to calculate the next heating time. Cooking device.