JPS61240917A - Rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to rice cookers, and particularly to microcomputer-controlled rice cookers, which have become common in recent years.

(Prior art) This type of rice cooker uses a temperature sensor to measure the temperature at the bottom of the inner pot or, in addition, at the side of the inner pot, and determines the amount of rice cooked based on the temperature rise curve of the inner pot during rice cooking. There is a normal rice cooking mode in which the rice is cooked with electricity commensurate with the amount of rice cooked, and an abnormal rice cooking mode in which the rice is cooked with a constant electricity regardless of the amount of rice cooked since the amount of rice cannot be judged if the temperature exceeds the rice cooking amount judgment area from the start of cooking. Conventionally, selection of these modes was performed based on the detection output of the temperature sensor at the start of rice cooking, that is, immediately after the user operated the rice cooking switch.

(Problems to be Solved by the Invention) However, in the conventional method, the inner pot is stored in the main body and the rice cooking switch is operated when the main body and temperature sensor are warm, such as immediately after warming or immediately after cooking rice.

Even when the inner pot is at a low temperature, depending on the followability of the temperature sensor, there is a problem in that the temperature sensor does not immediately reach a low temperature and selects the abnormal rice cooking mode. As a result, in the abnormal rice cooking mode, rice is cooked using a constant amount of electricity regardless of the amount of rice cooked, so there is a problem that the rice cannot be cooked as deliciously as in the normal rice cooking mode. In order to solve this problem, the rice cooking method is such that the rice cooking heater is not energized for a certain period of time after the user operates the rice cooking switch, and after the temperature of the temperature sensor and the inner pot become equal, the mode is selected and the energization is started. However, in this case, there was always a pause for a certain period of time, which caused the problem of longer cooking times.

(Means for Solving the Problems) The present invention has been made in order to solve the above problems, and has the purpose of preventing erroneous selection of the abnormal rice cooking mode and unnecessarily lengthening the rice cooking time. There is no need to get a rice cooker. For this purpose, the temperature T1 of the inner pot before the power supply to the rice cooking heater starts, the temperature T2 of the inner pot set in advance, and the temperature T of the inner pot after a certain period of time when temperature TI≧temperature T2.
Equipped with a temperature sensor that detects 3, the various temperatures T+ mentioned above are provided.
, Tt, and Ts.

(Function) By doing this, the temperature T+ < Tt
When the temperature Ts<Tt, the normal rice cooking mode is selected, and when the temperature T3≧T2, the abnormal rice cooking mode is selected.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

The configuration of this embodiment is as shown in FIG. 1, and FIG. 2 shows a flowchart of the same operation. In the figure, reference numeral 1 denotes a cylindrical main body with a bottom, which has an opening at the top and houses an inner pot 2 that can be attached and detached therein. Reference numeral 3 denotes a temperature sensor, which is installed inside the main body 1 so as to be in close contact with the outer bottom of the inner pot 2, and detects the temperature of the inner pot 2. 4 is a rice cooking heater.

It is installed inside the main body 1 so as to be in close contact with the outer bottom of the inner pot 2, and heats the inner pot 2. A lid 5 is attached to the main body 1 so as to be openable and closable so as to cover the openings of the two main bodies 1 and the inner pot 2. Reference numeral 6 denotes mode selection means, which is built in the control section 8 provided at the inner bottom of the main body 1 and is a micro combiator equipped with a rice cooking program.
Abnormal rice cooking mode is selected according to the correlation between the temperature TI of the inner pot before the start of energization + the pre-scheduled temperature T2 of the inner pot + temperature T, and the temperature T3 of the inner pot after a certain period of time when the temperature is ≧T2. It is something to do. Reference numeral 7 denotes an energization delay means, which is built in the control section 8 and is connected to a control circuit (not shown) in the control section 8;
It consists of a contact portion (not shown) that opens and closes a current supply circuit (not shown) to the rice cooking heater 2 via this control circuit.

Next, the operation of this embodiment will be described.

The user puts washed rice and an appropriate amount of water into inner pot 2.

The rice cooking switch (
When the rice cooker lamp (not shown) is operated, a rice cooking lamp (not shown) lights up to indicate that rice cooking has started.

Next, the temperature TI of the inner pot 2 detected by the temperature sensor 3 at this time is read and compared to see if it is higher or lower than the temperature T2 preset by the mode selection means B, and if the comparison result is temperature T+<temperature T2 .

Immediately after the normal rice cooking mode is selected, power supply to the rice cooking heater 4 is started according to the rice cooking program stored in the normal rice cooking mode. Moreover, the comparison result temperature TI≧temperature T2
In this case, it is generally considered that the rice cooking switch was turned off once during boiling water or rice cooking, and then operated again.
If the temperature sensor 3 has been in a high temperature state for some reason even though the internal cooked rice temperature is low, depending on the thermal responsiveness of the temperature sensor 3, it may incorrectly judge that the temperature TI≧temperature T2. However, in the second embodiment, in order to prevent this misjudgment, in the case of temperature T1≧temperature T2, the abnormal rice cooking mode is not selected immediately, but the energization delay means 7 is used to control the rice cooking heater 4 for a preset certain period of time θ. Shut off power. However, the rice cooking lamp remains lit. After a certain period of time θ, the inner pot 2 is detected again by the temperature sensor 3.
The temperature T3 is read and the mode selection means 6 selects the temperature T3.
and temperature T2, and as a result of this comparison, temperature T3≧temperature T2
If so, since the temperature of the inner pot 2 remains high even after a certain period of time has elapsed, it is determined that the situation is definitely abnormal, and the abnormal rice cooking mode is selected.

The power supply to the rice cooking heater 4 is started according to the rice cooking program stored in the abnormal rice cooking mode. or.

If temperature T3<temperature T2, temperature TI during a certain period of time θ
This means that the rice has cooled down to a temperature T3, and the mode selection means 6 selects the normal rice cooking mode.

The power supply to the rice cooking heater 4 is started according to the rice cooking program stored in this normal rice cooking mode.

(Effects of the Invention) As described above, according to the present invention, the temperature of the inner pot before starting rice cooking, the preset temperature of the inner pot, and the temperature of the inner pot after a certain period of time when the former temperature ≧ the latter temperature, etc. By comparison, it is possible to obtain a rice cooker that does not erroneously select an abnormal rice cooking mode and does not unnecessarily lengthen the rice cooking time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rice cooker according to an embodiment of the present invention, and FIG.
The figure is a flow chart diagram of the same operation. 1...Main body, 2...Inner pot. 6...Temperature sensor, 4...Rice cooking heater. 6... Mode selection means, 7... Energization delay means. θ...certain time, T+ + T2 + T
s...Temperature.

Claims (1)

[Claims] A detachable inner pot (2) housed in the main body (1), a rice cooking heater (4) that heats the inner pot (2), and a temperature sensor (3) that detects the temperature of the inner pot (2). Mode selection means (6) for selecting one mode from a plurality of rice cooking modes
) and start energizing the rice cooking heater (4) for a certain period of time (θ
), the temperature of the inner pot (2) (T_1) before the start of energization to the rice cooking heater (4), and the preset temperature (T_2) of the inner pot (2), temperature(
The mode selection means (
6) A rice cooker that selects an optimal rice cooking mode.