JPH06221578A - Controller for thermal cooker - Google Patents

Abstract

PURPOSE:To eliminate changes in the cooking condition such as burning color even when an interval time becomes shorter apparently because of a starting/ stopping operation of a thermal cooker such as oven toaster. CONSTITUTION:An interval time of a cooking operation such as toasting operation is measured by a first time measuring means 24 to estimate a temperature in a chamber of a thermal cooker such as oven toaster by a heating time decision means 25 and the energization time of heaters 20 and 21 is determined. During a cooking operation. the energization time is measured by a second time measuring means 27 during the operation of cooking and when the energization time does not exceed a fixed value, a first measuring means 24 is forbidden from being rest by a resetting means 26 using a reset forbidding means 28 in the end of the heating operation and the energization time not exceeding the fixed time is ignored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an oven toaster,
The present invention relates to a control device for controlling a cooking time and a roasting time of food such as toast, which is used in a microwave oven equipped with an electric range, an electric heater for browning and a magnetron.

[0002]

2. Description of the Related Art Conventionally, in a heating cooker such as an oven toaster, a mechanical timer such as a mainspring timer or the like is used for setting a cooking time such as a bread toast time.
An electronic timer such as a CR timer was used.

In recent years, an oven in which a toast time of bread is controlled by a program using a microcomputer (hereinafter referred to as a microcomputer) as shown in Japanese Patent Laid-Open No. 63-277021 instead of a mainspring timer or a CR timer. Toasters have come to be made. A control device for such an oven toaster will be described with reference to FIGS. 3 and 4. FIG. 3 is a cross-sectional view of the main body showing the structure of the oven toaster, in which the upper heater 2 and the lower heater 3 are provided in the main body 1, and the cooked food 5 placed on the placing table 4 is heated by the upper and lower heaters 2 and 3. It is configured to toast. Reference numeral 6 is a printed wiring board to which a microcomputer or the like is attached, and time can be set, start and stop by the input means 7. FIG. 4 is a block diagram showing an electrical configuration, in which relay contacts 8 are connected to the upper and lower heaters 2 and 3 so that the heaters can be turned on and off.
Reference numeral 9 denotes a time measuring means, which measures the time from the end of energization of the upper and lower heaters 2 and 3 to the start of the next toast operation, and after the toast starts from the measured interval time, the heating time determining means 10 optimizes the toast. Determine the energization time for obtaining the burn color. The relay drive circuit 11 closes the relay contact 8 for a determined time, and the upper and lower heaters 2 and 3 are energized to toast.

FIG. 5 shows a flow chart of a program when the above-mentioned operation is performed by the microcomputer. In step 1J, wait for the start switch input, and if the start is operated, step 2J
In step 3J, the baking time Ton is determined based on the measurement result output from the time measuring means. Next, in step 4J, the relay contact is turned on to start the toast operation. When the energization time has elapsed by Ton, the process proceeds to step 6J by step 5J to turn off the relay contact. At the same time, the time measuring means is reset to start measuring the time until the start of the next toast operation. And step 9J
Wait until the start switch is operated at.

[0005]

However, in the above configuration, when the heating heater is forcibly turned off for a short period of time before the cooking time such as the toast time is completed, that is, during uncooking, the toast is turned off. Since the measured value between cooking operations is apparently short, the cooking time for the next toast and the like is not the optimum value and the baking color of the toast and other cooking products becomes lighter, which is a drawback that the cooking state is not sufficient.

This will be described with reference to FIG. 6 which is a characteristic diagram showing the state of changes in the temperature inside the oven for each toast of an oven toaster. In the figure, the first toast operation is the energization time T
1, the internal temperature 12 gradually increases with the energization time. Then, when the toast ends, the internal temperature gradually decreases. As described above, the time to the next toast, that is, the interval time TS, is estimated from the temperature decrease in the refrigerator to determine the next toast time T2, but shortly after operating the start switch, When it is forcibly turned off after the time T1-A, the next toast is determined by the interval time TS-A, so it is estimated that the time from the end of the toast is short and the inside temperature is high. Since the time determined by 10 was shortened, the burning color was light.

An object of the present invention is to solve the above problems.

[0008]

In order to achieve the above object, a control device for a heating cooker according to the present invention includes a heating heater provided in a main body, a contact of a relay for turning on / off the electricity of the heating heater, and a relay. A relay drive circuit to be operated; a first time measuring means for measuring the time after the end of cooking; a heating time determining means for determining a heating time based on the elapsed time from the end of the previous cooking; The reset means of the first time measuring means which operates at the end of energization, the second time measuring means for measuring the time from the start of energization of the heater and the output of the second time measuring means operate for the first time. A reset prohibiting unit that prohibits resetting the measuring unit is provided.

[0009]

With the above configuration, the reset of the first measuring means for measuring the interval time from the end of the first cooking such as toast to the start of the second cooking such as toast is reset by the second measuring means. If the energizing time of the heating heater such as the toast is less than a certain time, the energizing of the heating heater is stopped by the prohibiting means for prohibiting the resetting of the first measuring means, and the interval time from the heating cooking such as the toast before the second is stopped. Since the heating time is determined by the above, the cooking state such as a constant baking color can always be obtained regardless of whether the start switch is on or off.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an oven / toaster showing an embodiment of the present invention. Reference numerals 20 and 21 are heaters provided in the main body, 22 is a relay contact for turning on / off the heater, and 23 is a relay. It is a relay drive circuit for operating. A first time measuring means 24 measures an interval time from the end of the toast to the start of the next toast. A heating time determining unit 25 estimates the temperature inside the refrigerator from the measurement result of the first time measuring unit 24 and determines the heating time of the toast. Reference numeral 26 is a resetting means that resets the first measuring means at the end of the toast and restarts the measurement of the interval time with the end point of the toast as the origin.

Numeral 27 is a second time measuring means for measuring the time from the start to the end of energization of the heater when toasting. Reference numeral 28 denotes a reset prohibiting means for resetting the first time measuring means 24 by the reset means 26 at the end of the toast when the energization time obtained by the second measuring time is shorter than the predetermined time. It acts to prohibit.

FIG. 2 shows a flow chart of a program when the above configuration is realized by a microcomputer. The operation will be described with reference to the flowchart. First, in Step 1, the operation of the start switch is waited, and when the start switch is operated, in Step 2, the first measuring means for measuring the interval time between the toasts. Is output, and the baking time Ton which is the energization time for the toast is determined in step 3. Next, at step 4, the relay contact 22 is closed and the heaters 20 and 21 start the toasting operation.

During the toasting operation, in step 5, the energizing time T2 is measured by the second time measuring means. During this period, the first time measuring means is stopped. When the energization time T2 reaches the predetermined energization time Ton, the process proceeds to the next step in step 6. Then, in step 7, the relay contact is opened. If the output T2 of the second time measuring means is 25 seconds or more in step 8, the first time measuring means is reset in step 9 and the toast operation is finished.

If in step 8, the heaters 20 and 2 are
If the energization time for 1 is less than 25 seconds, step 9 is skipped and step 10 is entered, so that resetting of the first time measuring means is prohibited. Therefore, if the heater is turned on and the energization to the heater is immediately turned off during the toast operation during which the interval time is being measured, the time from the end of the toast before the start is retained as data, and this time The energization time is determined by the total of the interval time until the toast is started after the current is energized.

In step 10, while measuring the interval time until the next toast, the process waits until the start switch is operated again in step 11, and the next toast can be recycled as described above.

In the present embodiment, it is set to 25 seconds, but the present invention is not limited to 25 seconds, and the time can be set appropriately. Further, the present invention can be applied not only to an oven toaster but also to an electric range or a microwave oven equipped with an electric heater and a magnetron.

[0018]

As described above, the controller of the heating cooker according to the present invention measures the interval time between cooking operations such as toast operation and determines the energization time of the heating heater during cooking operations such as toast operation. However, if the heater is energized for a short time during the interval time measurement, the energization is ignored and the energization time is determined. The energizing time of the heater can be determined so that the cooking state is constant, and its practical value is great.

[Brief description of drawings]

FIG. 1 is a block diagram of an oven toaster according to an embodiment of the present invention.

FIG. 2 is a flow chart of a program for an oven / toaster showing an embodiment of the present invention.

FIG. 3 is a schematic sectional view of an oven toaster according to an embodiment of the present invention.

FIG. 4 is a block diagram of a conventional oven toaster.

FIG. 5 is a flowchart of a program showing an example of a conventional oven toaster.

FIG. 6 is an operating characteristic diagram of the oven toaster.

[Explanation of symbols]

 20 and 21 heating heater 22 contact point of relay 23 relay drive circuit 24 first time measuring means 25 heating time determining means 26 resetting means 26 second time measuring means 28 reset inhibiting means

Claims (2)

[Claims] Claim: What is claimed is: 1. A heater provided in a main body, a contact point of a relay for turning on and off electricity to the heater, a relay drive circuit for operating the relay, and a first time measuring means for measuring a time after completion of cooking. And heating time determining means for determining the heating time based on the elapsed time from the end of the previous cooking,
It operates by the reset means of the first time measuring means that operates at the end of energization of the heating heater, the second time measuring means that measures the time from the start of energizing the heater and the output of the second time measuring means, A control device for a heating cooker, comprising: reset prohibiting means for prohibiting reset of the first time measuring means. 2. The heating cooker according to claim 1, which is an oven toaster in which a heater is provided in a main body.