JPH02277419A - Rice cooker - Google Patents

Abstract

PURPOSE:To cook tasteful rice regardless of a rice cooking quantity, by controlling a heating means so that a definite temperature rise rate of a pot is kept. CONSTITUTION:A heater 13 is controlled so that a temperature may come to T1 in a pre-cooking process. In a rice cooking process, first, the heater 13 is electrified, and it is discriminated whether 15 seconds or more are spent for rise by 2 deg.C or not. In case of 15 seconds or less, it is confirmed that 13 seconds or more are spent for further rise by 2 deg.C on a following step, and it is discriminated whether the detection temperature of a temperature-sensitive element comes to approx. 95 deg.C or not. In the cooking process, the heater 13 is electrified, and is continuously heated till water in a pot comes to nothing, and it is discriminated whether the heater comes to a specified temperature 135 deg.C or not. Finally, a time after a steaming mode is set is discriminated, and when rice cooking is completed, then a heat retaining mode for retaining the heat of cooked rice is set. Then, a temperature in the pot is heightened along a specified curve.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rice cooker for general household use.

Prior art This type of conventional rice cooker is disclosed in Japanese Patent Application Laid-open No. 60-419.
As shown in Publication No. 09, after the pre-cooking process is completed, the rice is cooked by continuously operating the heater in the leveling process and the rice cooking amount determination process, and the rice cooking amount is determined based on the temperature rise. In the rice cooking process/cooking process, the heater was controlled according to the determined amount of rice cooked.

Problems to be Solved by the Invention However, in such conventional rice cookers, it is not possible to control the heater during the rice cooking and finishing processes based on the determination of the amount of rice to be cooked, so that the temperature rise detected by the temperature sensor is optimized. However, since the heater is operated continuously during the break-in process and judgment process, the slope of the temperature detected by the temperature sensor will be large if the amount of rice cooked is small, and the slope will be small if the amount of rice cooked is large. In the break-in process/judgment process,
The problem was that the temperature could not be raised appropriately for the amount of rice being cooked, making it impossible to cook delicious rice.

The present invention is intended to solve these problems, and provides a rice cooker that can cook delicious rice by controlling the heating means so that the temperature rise in the pot is optimal, regardless of the amount of rice being cooked. The purpose is to provide

Means for Solving the Problems In order to achieve the above object, the rice cooker of the present invention includes a rice cooking switch for starting rice cooking, a heating means for heating the pot, a temperature sensor for detecting the temperature of the pot, and this temperature sensor. and a slope correction means for correcting the temperature increase rate by detecting the temperature increase rate and controlling the heating means so that the temperature increase rate becomes constant.

Function According to the above configuration, rice can be cooked by controlling the heating means so that the temperature rise in the pot is optimal regardless of the amount of rice being cooked, so delicious rice can be cooked regardless of the amount of rice being cooked. I can do it.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

Figure 1 shows a block diagram of a rice cooker according to an embodiment of the present invention, in which 1 is a heating means such as a heater that heats a pot, 2 is a rice cooking switch that starts cooking rice, and 3 is a sensor that detects the temperature of the pot. 4 is a pre-cooking means that energizes the heating means 1 using the rice cooking switch 2 to keep the temperature in the pot constant and allows water to be absorbed into the rice; 6 is a pre-cooking means that detects the temperature rise rate of the temperature sensor 3 and raises the temperature. Inclination correction means corrects the temperature increase rate by correcting and controlling the energization rate of the heating means 1 so that the rate becomes a predetermined value that is optimal for rice cooking; and 6 is a control means that completes the rice cooking by heating the rice unevenly. be.

FIG. 2 is a circuit diagram of a rice cooker according to an embodiment of the present invention, which is made up of a microcomputer 7 and peripheral circuits. The microcomputer 7 shown here includes a CPU, R
It is a so-called one-chip microcomputer consisting of OM, RAM, input/output ports, etc. 8 is a temperature sensing element that detects the temperature of the pot, and this temperature sensing element 8 is connected to an A/D converter 9.
It is connected to the input port of the microcomputer 7 via. As a result, the temperature signal from the temperature sensing element 8 is converted into a binary code and read into the microcomputer 7. 1o is a rice cooking switch, and 11 is a cancel switch, which are input to the microcomputer 7 to determine whether or not they are pressed. Reference numeral 12 is an AC power supply, and a series circuit of a heater 13 that heats the pot and a relay contact 14 is connected to this AC power supply 12, and a current is caused to flow through the relay coil (V16) via a transistor 16 in response to a signal from the output port of the microcomputer 7. Accordingly, the relay contact 14 is configured to open and close. 1
7 is a DC power supply for operating the circuit described above.

Next, the operation of the rice cooker configured as above will be explained. FIG. 3 is a flowchart of a program stored in the ROM in the microcomputer 7, and the operation of the program will be explained in accordance with the procedure shown in this flowchart, also with reference to FIG.

First, in step S1, it is determined whether or not the rice cooking switch 1o has been pressed, and the determination is repeated until it has been pressed, and when it has been pressed, the process advances to step S2. In step S2, the pre-cooking mode is entered and the heater 13 is controlled over a certain period of time so that the temperature detected by the temperature sensing element 8 becomes τ1. This process is a pre-cooking process.

When the pre-cooking process is completed, the process proceeds to step S3, where the heater 13 is energized, and the process proceeds to step S4. In step S4, wait until the temperature rises by 2 degrees, and when it rises by 2 degrees, proceed to step 5.
To determine whether it took more than 16 seconds,
Proceeding to step S6, the energization rate of the heater 13 is increased by 1 second.

However, if the energization exceeds 16 seconds, the time shall be 16 seconds. Then, the process advances to step S7.

If it takes less than 16 seconds to rise by 2 dogs in step S6, it is determined in step S8 whether it takes less than 13 seconds to rise by 2 dogs, and if it takes more than 13 seconds, the process advances to step S7; If so, proceed to Nuteno7'S9. In step S9, the energization rate of the heater 13 is reduced by 1 second. However, if the current is energized for less than 2 seconds, set it to 2 seconds. Then, the process advances to step S7.

In step S7, the temperature detected by the temperature sensing element 8 is T2 (approximately 96 degrees Celsius).
), and if T2 has not been reached, return to step S4, and if T2 has been reached, step S10
Proceed to. This process is a rice cooking process.

In step S10, the cooking mode is entered, and the heater 13
energize. Then, the process proceeds to step S11, where the pot is heated until the water in the pot runs out.When the water runs out, the temperature sensing element 8 rapidly rises and determines whether the temperature has reached a predetermined temperature (approximately 136°C). Then, the process advances to step 312. This process is a cooking process.

In step S12, the mode is entered into irregularity mode, and step S12 is entered.
In step 13, it is determined whether a predetermined amount of time has elapsed since entering the uneven mode, and it is determined whether rice cooking is complete. When the rice cooking is completed, in step S14, the mode enters a warming mode to keep the cooked rice warm, and in step S15, the cancel switch is turned 1.
1 has been pressed, and if the cancel switch 11 has not been pressed, the process returns to step S14, and if the cancel switch 11 has been pressed, the process returns to step S1.

In this way, according to this embodiment, regardless of the amount of rice to be cooked, the temperature rise in the pot can be made to pass on the optimal predetermined curve, and the rice can be cooked, so that delicious plates can be produced regardless of the amount of rice to be cooked. Can be cooked.

By keeping the temperature rise in the pot constant throughout the entire rice cooking process from immediately after the pre-cooking process, an optimal rice cooking pattern can be achieved and delicious rice can be cooked.

Although a heater is used as the heating means in this embodiment, a heating coil for induction heating or a magnetron for dielectric heating may be used as the heating means, for example.

Moreover, although the temperature increase rate was determined based on the time required for the temperature to rise by 2 dogs, it may also be determined based on the temperature that increases over a certain period of time, and in short, any method that determines the temperature rise may be used.

Effects of the Invention As is clear from the description of the above embodiments, according to the present invention,
Regardless of the amount of rice cooked, it is now possible to control the heating means for the entire rice cooking process so that the temperature rise in the pot is optimal, making it possible to cook delicious rice regardless of the amount of rice cooked. It becomes like this.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a rice cooker showing an embodiment of the present invention;
Fig. 2 is a circuit diagram of the rice cooker, Fig. 3 is a flowchart showing an example of a program of the rice cooker, and Fig. 4 is a temperature characteristic diagram within the pot. 1... Heating means, 2... Rice cooking switch, 3... Temperature sensor, 4... Pre-cooking means, 6... Tilt correction Means, 6... Control means. Name of agent: Patent attorney Shigetaka Awano and one other person II
Fig. 7-°-Mygro Compieg 8・-nu 1 Qinko lθ・-Rice Cooking Suidute 13・-Heater 14°"Ware Ale, 16・-Ware Fil

Claims (1)

[Claims] A rice cooking switch that starts cooking rice, a heating means that heats a pot, a temperature sensor that detects the temperature of the pot, and a temperature rise rate of this temperature sensor is detected and the heating means is controlled so that the temperature rise rate is constant. A rice cooker comprising a tilt correction means for correcting a temperature rise rate.