JPS60174429A - Heating and cooking unit - Google Patents

Abstract

PURPOSE:To facilitate a preheating time setting operation by a method wherein a preheating time corresponding to a set temperature is defined for every cooking menu and the preheating operation is terminated after the preheating time is elapsed. CONSTITUTION:When a menu key 5-1 at the operating part 9 is operated, a cooking operation is started and also a preheating operation is started. As each of the cooking menus, a predetermined time and a cooking temperature are stored in a microcomputer 11, so that the microcomputer 11 calculates a maximum preheating time (t) corresponding to the predetermined time in accordance with the predetermined formula and the preheating time is set. The preheating operation is finished when the temperature 6 in the heating chamber is reached to the predetermined temperature or when the calculated time is elapsed. With this arrangement, the preheating operation can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a heating cooker, and specifically relates to controlling the preheating time of an oven.

[Prior art]

Conventionally, this type of cooking device has a heater placed in a heating chamber provided inside the main body, and is configured to heat food inserted into the heating chamber to a temperature corresponding to the type of cooking. .

By the way, with such a heating cooker, it is possible to perform reheating cooking that simply warms food and oven cooking that heats and cooks food.In oven cooking, there is a method of preheating the heating chamber before cooking. It is taken.

However, the preheating time in conventional oven cooking is controlled by setting the preheating time for each cooking menu listed in a cookbook to a timer in advance, or by setting the preheating time to a timer in advance. - A method of controlling the heating chamber by monitoring the temperature in the heating chamber in the evening and notifying the end of preheating when it reaches a predetermined temperature has been used.

For this reason, preheating time control using a timer has different preheating times for each cooking menu, making the setting cumbersome, and preheating time control using a microcomputer has difficulty reaching the set temperature when the power supply voltage is low. There was a drawback that the preheating time was too long.

This invention was made to solve this problem, and its purpose is to provide a heating cooker that can ensure an appropriate preheating time for oven cooking without complicated operations. be.

[Summary of the invention]

The present invention controls the preheating time to the time required for the heating chamber temperature to reach the set temperature for each cooking item, or converts the preheating time corresponding to the set temperature and adjusts the preheating time to the time required to reach this converted time. It is configured to control.

[Embodiments of the invention]

Hereinafter, the present invention will be explained based on examples.

FIG. 1 is an external view showing an embodiment of the present invention.

In the same figure, ■ is the main body of the heating cooker, 2 is the heating chamber, and 3 is the main body of the heating cooker.
Reference numeral 4 indicates a sheath type heater placed in the heating chamber 2, 4 a door for opening and closing the heating chamber, and 5 an operation gH.

FIG. 2 is a block diagram of the electrical system, in which the temperature in the heating chamber is detected by a temperature detecting thermistor 6 placed inside the heating chamber 2, and a temperature detecting section 7. The lower heater 3A and upper heater 3B are controlled through the heating control section 8.

FIG. 3 is a diagram showing details of the operation section 5, and the key manual section 9.
and a display section 10.

FIG. 4 is a block diagram of the control unit 8, in which signals input from the operation unit 5 are input to the one-chip microcomputer 11, which controls the control relays 12, 13, 14.
A lower heater 3A and an upper heater 3B, which are heat sources, are controlled through the lower heater 3A and the upper heater 3B.

When cooking, when a cooking key (5-1) corresponding to a cooking menu is selected and operated on the operation unit 9 shown in FIG. 3, cooking starts and preheating starts.

Each cooking menu has a predetermined cooking time and cooking temperature stored in the memory (R) of the microcontroller 11 shown in FIG.
The cooking temperature is stored in the cooking temperature (OM), and heating is performed for a certain period of time at that cooking temperature, but before that, preheating is required until the set temperature is reached. The maximum time limit for this preheating time is determined by the following formula:
CPU), and this is the maximum value of the preheating time.

t=kT (minutes)...(1) However, t: Maximum limited preheating time (minutes) T: Set temperature ('C) k: Constant For example, if k = 0.6, the preheating time t is as follows. It will look like Table 1.

As shown in Table 1, when preheating starts, the temperature in the heating chamber is detected by the thermistor 6.

The output signal from the thermister 6 is sent to the central processing unit (A/D) through the A/D converter (A/D) of the microcomputer 11.
(CPU), and the heating chamber temperature is detected. As a result, when this detected temperature reaches the set temperature,
When the maximum limited preheating time t calculated using the first equation is reached, it is determined that the preheating has ended, and the preheating is completed.

The above operation is shown in a flowchart as shown in FIG.

In this way, preheating is completed and the food is placed in the heating chamber.
When re-cooking is performed, cooking is completed after heating for a predetermined cooking time. In this example, the set temperature and maximum preheating time are treated as a linear function.
It can be converted using any function, not just this one.

〔Effect of the invention〕

As described above, the preheating time of the oven according to the present invention is determined to be completed when the temperature in the heating chamber reaches the set temperature or when the maximum preheating time limit calculated according to the set temperature is reached. By setting the value of k in the first equation appropriately, even if the temperature in the heating chamber does not reach the set temperature easily when the power supply voltage is low, it is possible to preheat to a certain degree necessary for oven cooking. Preheating can be completed. As a result, the preheating time will not become unnecessarily long, and the optimal preheating time for each type of cooking can always be ensured, resulting in effects such as power savings.

[Brief explanation of drawings]

FIG. 1 is an external view showing an embodiment of the heating cooker of the present invention,
FIG. 2 is a block diagram of the electrical system; FIG. 3 is a diagram showing one implementation of the operation panel section; FIG. 4 is a block diagram of the control section; and FIG. 5 is a flowchart of preheating time control. ■...Main body, 2...Heating chamber, 3!33A. 3B... Heater, 5... Operation tJIS, 6... Temperature sensor, 11... Microcomputer, CPU.
...Central processing unit, ROM...memory. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa (and 2 others)

Claims (1)

[Claims] a heating chamber; a heating means for heating the food inserted into the heating chamber to a set temperature according to the cooking type; a first control means for determining a preheating time corresponding to the set temperature for each cooking type;
a second control means for stopping preheating by the heating means when a preheating time determined by the first control means is reached during a heating chamber preheating time before cooking; .