JPH01164318A - Microcomputer-controlled rice cooker - Google Patents

Abstract

PURPOSE: To prevent uneven rice cooking, by cooking rice with maximum cooking power until the temperature of a rice cooking pan reaches the vicinity of the boiling temperature after judging the cooking rice volume by a rice cooking volume judging means. CONSTITUTION: Power control for heating in a rice cooking process is started. At this time, a microcomputer 10 inputs the voltage output converted to digital quantity through an input port of an analog/digital converting function, processes to convert the inputted digital quantity to temperature, and judges the inputted temperature to control various rice cooking processes. The rice cooking process performs a water absorbing process to make rice absorb water by reducing heating power at the initial period of rice cooking. Then heating power is increased for a cooking finishing process to raise temperature rapidly to boil water then a boiling retaining process to retain a boiling condition is performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a microcomputer-controlled rice cooker, and particularly to a microcomputer-controlled rice cooker that controls rice cooking to eliminate uneven cooking and sticky rice at the bottom of the pot. It is.

[Conventional technology]

Traditionally, the purpose was to cook rice deliciously.

A controller equipped with a temperature sensor and a microcomputer measures the temperature of the rice cooking pot, inputs this temperature and temperature rise into the microcomputer, determines the rice cooking capacity, and performs appropriate power control according to the rice cooking capacity. A rice cooker with microconvection control has been developed. In an automatic rice cooker that cooks rice under the control of a microcomputer, the steps are sequentially: ■ water absorption process, ■ rice cooking capacity determination process, ■ boiling process, ■ boiling maintenance process, ■ first scouring process, ■ additional cooking process, ■Second unevenness process and ■Warmth retention process are performed. How to control this rice cooking process.

This is performed automatically and sequentially under the program control of a microcomputer.

[Problem that the invention seeks to solve]

However, in such a microcomputer-controlled rice cooker, the rice cooking capacity is determined.

Next, rice is cooked using the rice cooking power according to the rice cooking capacity.

The temperature when shifting to the rice cooking power control according to the rice cooking capacity is below the boiling temperature.

In rice cooking power control, following the determination of the rice cooking capacity, rice is cooked using the rice cooking power according to the rice cooking capacity after the determination, so depending on the difference in rice cooking capacity, the degree of temperature rise until reaching the boiling temperature of the rice cooking pot may vary. There was a problem that the progress of gelatinization of the rice changed, and the rice at the bottom of the pot became sticky, which was not a desirable condition. The present invention was made to solve the above problems.

An object of the present invention is to provide a microcomputer-controlled rice cooker that controls rice cooking so as to eliminate uneven cooking and eliminate stickiness of rice at the bottom of the pot.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means for solving problems]

In order to achieve the above object, in the present invention.

It has a rice cooking capacity determining means that measures the temperature change of the rice cooking pot and determines the rice cooking capacity using a temperature sensor and a microcomputer provided near the rice cooking pot, and the rice cooking power is determined according to the rice cooking capacity determined by the rice cooking capacity determining means. In a microcomputer-controlled rice cooker that cooks rice with rice, after determining the rice cooking capacity with the rice cooking capacity determining means, rice is cooked with the maximum cooking power until the temperature of the rice cooker reaches near the boiling temperature, and then the rice cooking power is adjusted according to the rice cooking capacity. The main feature is that it is equipped with a rice cooking power control means that switches to cook rice.

[Effect]

According to the above-mentioned means, after the rice cooking power control means determines the rice cooking capacity using the rice cooking capacity determination means, the rice cooking power control means cooks rice at the maximum rice cooking power until the temperature of the rice cooker reaches near the boiling temperature, and then,
Switch to the cooking power according to the rice cooking capacity and cook the rice. As a result, until the temperature of the rice cooker reaches near boiling temperature,
Rice is cooked at the maximum cooking power, so there is no uneven cooking.
It also eliminates the stickiness of rice at the bottom of the pot.

[Embodiments of the invention]

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

FIG. 1 is a partially cutaway side view of a microcomputer-controlled rice cooker according to an embodiment of the present invention. In Figure 1, 1
2 is the rice cooker main body, 2 is an inner pot, and 3 is an inner pot storage container for storing the inner pot 2.

Further, 4 is a rice cooking heater, and 5 is a temperature sensor composed of a thermistor or the like that is in contact with the bottom of the inner pot 2. 6
is a control unit incorporating a microcomputer, etc. 7 is a rice cooking switch, and 8 is a heat-retaining heater.

FIG. 2 is a block diagram showing the configuration of main parts of the control unit 6. As shown in FIG. In Fig. 2, 4 is a rice cooking heater;
is a temperature sensor composed of a thermistor or the like. 7 is a rice cooking switch. Reference numeral 10 denotes a microcomputer, which includes a processing device CPU, a memory RAM, a program memory ROM, an input port having an analog/digital conversion function, an output port for outputting a control output signal, and the like. Reference numeral 11 denotes an energization control means such as a triac, which controls the heating power by controlling the pulse width applied thereto. 12 is a commercial AC power source.

Reference numeral 13 denotes a display means consisting of an LED or the like.

Next, the operation of the microcomputer-controlled rice cooker configured as described above will be explained.

When you put the desired amount of rice and water in the inner pot 2 and turn on the rice cooking switch 7, the microcomputer 10 starts the rice cooking process according to the processing steps of the rice cooking program stored in the program memory ROM. Start power control for heating at. At this time, the microcomputer 10 inputs the voltage output from the temperature sensor 5 by converting it into a digital quantity from the input port of the analog/digital conversion function, performs processing to convert it into temperature, and determines the input temperature. Various rice cooking processes are controlled based on the temperature determination results.

To explain the outline of this rice cooking process, in the initial stage of rice cooking, a water absorption process is performed in which the heating power is reduced and the rice absorbs water. Next, increase the heating power.

The cooking process involves rapidly raising the temperature and bringing it to a boil.

Then, a boiling maintenance step is performed to maintain boiling.

As this boiling maintenance process continues, the rice absorbs enough water, the moisture at the bottom of the inner pot disappears, and when a predetermined temperature, for example 130°C, is reached, this temperature is detected and the microcomputer 10
Turns off the heater and ends the boiling maintenance process. Next, a first shading process, an additional cooking process, and a second shading process are performed, and finally a warming process is reached, and the rice cooking process is ended.

FIG. 3 is a diagram showing an example of a rice cooking temperature curve showing the temperature change of w42 when rice is cooked by such a microcomputer-controlled rice cooker. In FIG. 3, area ■ indicates the water absorption process.

Area ■ indicates the cooking process including the rice cooking capacity determination process,
Area (■) indicates a boiling maintenance process, and area (2) indicates an uneven process in which the heating power for cooking rice is reduced to zero. The cooking process in area ■ is a process in which the heating power is increased, the temperature is rapidly increased, the temperature is brought to a boil, and the process continues to the boiling maintenance process, but here it includes the process of determining the rice cooking capacity (determining the number of units). ,
Through this rice cooking capacity determination step, the rice cooking capacity is determined. Then, in the next boiling maintenance step, heating power is controlled to be appropriate according to the determined rice cooking capacity to maintain boiling appropriately.

The method of determining the rice cooking capacity (determining the number of rice cookers) here will be explained using FIG. 3.

The rice cooking capacity in this example is determined by turning off electricity for a certain period of time (several seconds) at a low temperature that does not affect gelatinization and is not easily influenced by environmental conditions during the temperature rise in the cooking process, and then The rice cooking capacity is determined by heating the rice at maximum heating power and measuring the time it takes to reach a predetermined temperature.

That is, as shown in FIG. 3, first, at a relatively early stage of the cooking process, when a certain temperature reaches 10, the heating power is turned off for a certain period of time (S seconds). Even when the heating power is turned off, the temperature of the rice cooker continues to rise, but the way the rice cooker overruns varies depending on the difference in rice cooking capacity, and the temperature of the rice cooker changes after 8 seconds. For example, when the rice cooking capacity is small, the temperature is t1, and when the rice cooking capacity is large, the temperature is t2. Then, 8 seconds after turning off the heating power, the rice is heated with the maximum cooking power, that is, heated with the maximum heating power from this different temperature (t i, t t 2 ) to reach the predetermined temperature t3. By measuring the time S], ..., S2, the rice cooking capacity is determined. Therefore, in this rice cooking capacity determination method, the temperature at which time counting for rice cooking capacity determination is started differs depending on the rice cooking capacity. By counting the time until the predetermined temperature is reached with this temperature difference, the determination time for rice cooking capacity determination can be shortened. Especially when the rice cooking capacity is small, the rice cooking capacity can be determined in a short time.

Next, a cooking process including a rice cooking capacity determination process and a boiling maintenance process in the present application will be explained.

FIG. 4 is a flowchart showing an example of the control operation of the rice cooking process and boiling maintenance process including the rice cooking capacity determination process performed by the microcomputer.

Once the water absorption process is complete, the cooking process begins and Step 2
Perform processing from 0. First, in step 20, the rice cooking heater is turned on at full output HW.

Next, in step 21, the temperature at the bottom of the inner pot reaches a predetermined temperature t.
It is determined whether or not the temperature has reached 0°C, and if it has not reached tO°C, the full output HW of the rice cooking heater is continued to be energized in step 20. When the temperature of the inner pot reaches 10℃, step 22
The power to the rice cooking heater is turned off at step 23, and it is determined whether a predetermined time (8 seconds) has elapsed at step 23, and the power supply to the rice cooking heater at step 22 is continued until S seconds have elapsed. do. When the rice cooking heater is turned off for S seconds, a time counting process corresponding to the rice cooking capacity starts, and in step 24, the T1 counter starts counting the time. Turn on the rice cooking heater at full output HW. Then, in step 26, it is determined whether the temperature at the bottom of the inner pot has reached a predetermined temperature t3°C, and if it has not reached t3°C, step 2
Continue energizing the rice cooking heater at full output in step 5. That is,
In step 26, the temperature of the inner pot is detected, and until the temperature at the bottom of the inner pot reaches t3°C, the rice cooking heater continues to be energized and the Tl counter continues to count, and the temperature at the bottom of the inner pot is When reaches t3℃, the next step 27
Then, the counting operation of the Tl counter is stopped.

The series of steps up to now are steps for determining the rice cooking capacity.

The manner in which the temperature of the rice cooker overruns when the heating power is turned off when the temperature of the rice cooker reaches a constant temperature tO<0>C differs depending on the rice cooking capacity. For this reason, after heating to a constant temperature of 10 °C.

The temperature of the rice cooker after a certain period of time (8 seconds) has elapsed since the heating power was turned off varies depending on the rice cooking capacity.

On the other hand, under constant power heating conditions, the gradient of temperature rise is inversely proportional to the heat capacity (cooking capacity) of the object to be heated.

Therefore, when a certain temperature to °C is reached, the heating power is turned off for a certain period of time (8 seconds), and then the heating power is turned on again and counting starts for 1 hour, and the judgment end temperature t
When the temperature reaches 3° C., time counting is stopped and counting is performed for 1 hour. The time is proportional to the rice cooking capacity, and the rice cooking capacity can be determined. That is, the count value by the Tl counter is proportional to the rice cooking capacity.

Next, in steps 28, 33, and 38, the count value of the Tl counter is determined, and according to the content of each count value (rice cooking capacity), processing is performed to control the rice cooking power according to the rice cooking capacity. In this rice cooking power control, first, the rice is cooked at the maximum cooking power HW until the rice reaches near the boiling temperature, and then the rice cooking power is switched to the rice cooking power according to the respective rice cooking capacity. Switching from the maximum rice cooking power to the rice cooking power according to the rice cooking capacity is done by cooking rice at the maximum rice cooking power for a predetermined time set corresponding to each rice cooking capacity, and then switching to the rice cooking power according to the rice cooking capacity. There is. That is, first, in step 28, it is determined whether the content of the T1 counter is less than or equal to a predetermined value m1. The content of T1 counter is m1
If not, the process proceeds to step 33, where it is determined whether the contents of the T1 counter are between m1 and m2. Tl
If the contents of the counter are not m1-m2, the process proceeds to step 38, where it is determined whether the contents of the Tl counter are m2-m3.

On the other hand, in step 28, the content of the Tl counter is m
When the value is 1 or less, the process proceeds to step 29 and the rice cooking heater is turned on at the maximum rice cooking power HW. Next, in step 30, it is determined whether the time ta seconds set according to the rice cooking capacity has elapsed. If ta seconds have not elapsed, step 2
At step 9, rice cooking is continued using the maximum rice cooking power HW, and when ta seconds have elapsed, the temperature of the rice cooking pot has reached near the boiling temperature, so the process proceeds to step 31 to switch to the rice cooking power according to the rice cooking capacity. In step 31, the rice cooking power AW is changed according to the rice cooking capacity, and the rice cooking heater is turned on with the rice cooking power AW. Then, in step 32, it is determined whether the temperature of the rice cooker is 130° C. or lower. When the temperature of the rice cooking pot is 130° C. or lower, the process returns to step 31, the rice cooking heater is turned on with the rice cooking power AW according to the rice cooking capacity, and the rice is cooked while maintaining boiling. The temperature of the rice cooker is 130℃
When this happens, the cooking and boiling maintenance are completed, so the process proceeds to step 47, the rice cooking heater is turned off, and the process moves to the next scouring process.

Also, in step 33, the content of the Tl counter is m
1 to m2, the process proceeds to step 34 and the rice cooking heater is turned on at the maximum rice cooking power HW.

Next, in step 35, the time tb is set according to the rice cooking capacity.
Determine whether seconds have elapsed. If tb seconds have not elapsed, rice cooking is continued using the maximum rice cooking power HW in step 34, and when tb seconds have elapsed, the temperature of the rice cooker has reached near the boiling temperature, so the rice cooking pot is adjusted according to the rice cooking capacity. Proceed to step 36 to switch to rice cooking power. In step 36, switch to rice cooking power BW according to the rice cooking capacity, and change to rice cooking power B.
Turn on the rice cooking heater with W. Then, in step 37, it is determined whether the temperature of the rice cooker is 130° C. or lower. When the temperature of the rice cooking pot is 130° C. or lower, the process returns to step 36, the rice cooking heater is turned on with the rice cooking power BW according to the rice cooking capacity, and the rice is cooked while maintaining boiling. When the temperature of the rice cooker reaches 130°C, the cooking and boiling maintenance are completed, so the process proceeds to step 47, the rice cooking heater is turned off, and the process moves to the next steaming process.

Also, in step 38, the content of the Tl counter is m
When the amount is 2 to m3, the process proceeds to step 39 and the rice cooking heater is turned on at the maximum rice cooking power HW.

Next, in step 40, the time tc is set according to the rice cooking capacity.
Determine whether seconds have elapsed. If te seconds have not elapsed, rice cooking is continued using the maximum rice cooking power HW in step 39, and when tc seconds have elapsed, the temperature of the rice cooker has reached near the boiling temperature, so the rice cooking pot is adjusted according to the rice cooking capacity. Proceed to step 41 to switch to rice cooking power. In step 41, the rice cooking power CW is changed according to the rice cooking capacity, and the rice cooking power C
Turn on the rice cooking heater with W. Then, in step 42, it is determined whether the temperature of the rice cooker is 130° C. or lower. When the temperature of the rice cooking pot is 130° C. or less, the process returns to step 41, the rice cooking heater is turned on with the rice cooking power CW corresponding to the rice cooking capacity, and the rice is cooked while maintaining boiling. When the temperature of the rice cooker reaches 130°C, the cooking and boiling maintenance are completed, so the process proceeds to step 47, the rice cooking heater is turned off, and the process moves to the next steaming process.

Also, in step 38, the content of the T1 counter is m
When it is not 2 to m3, the process proceeds to step 43 and the rice cooking heater is turned on at the maximum rice cooking power HW. Next, in step 44, it is determined whether the time td seconds set according to the rice cooking capacity has elapsed.

If td seconds have not elapsed, rice cooking is continued using the maximum rice cooking power HW in step 43, and when td seconds have elapsed, the temperature of the rice cooker has reached near the boiling temperature, so the rice cooking pot is adjusted according to the rice cooking capacity. Proceed to step 45 to switch to rice cooking power. In step 45, the rice cooking power DW is changed according to the rice cooking capacity.
, and turn on the rice cooking heater using the rice cooking power DW. Then, in step 46, the temperature of the rice cooker is set to 130°C.
Determine whether the following is true. The temperature of the rice cooker is 130℃
In the following cases, the process returns to step 45, the rice cooking heater is turned on with the rice cooking power DW according to the rice cooking capacity, and the rice is cooked while maintaining boiling. When the temperature of the rice cooker reaches 130°C, the cooking and boiling maintenance are completed, so the process proceeds to step 47, the rice cooking heater is turned off, and the process moves to the next steaming process.

In this way, after determining the rice cooking capacity, the rice is cooked at the maximum rice cooking power for a predetermined time set according to the rice cooking capacity until it reaches near boiling temperature, and then the rice is cooked at the rice cooking power according to each rice cooking capacity. The rice cooking control is performed by switching the rice cooking power and controlling the rice cooking power. As a result, regardless of the rice cooking capacity, the rice cooker will continue to cook until it reaches near boiling temperature.
゛Since rice is cooked at the maximum rice cooking power without reducing the heating power for cooking rice, the temperature rise during cooking can be kept almost constant, eliminating uneven cooking of rice and sticky rice at the bottom of the pot.

Next, another embodiment will be described. In the rice cooking power control of the above-described embodiment, after determining the rice cooking capacity, rice is cooked at the maximum rice cooking power for a predetermined time set according to the rice cooking capacity, so that the rice is cooked to a temperature close to the boiling temperature. That is, the cooking is controlled to a temperature close to the boiling temperature by time control. By the way, the rice cooking control may be performed by detecting the temperature of the rice cooking pot and, when this temperature reaches the boiling temperature, switching to the cooking fFl power according to the rice cooking capacity. Such an embodiment will be described next.

FIG. 5 is a flowchart showing another example of the control operation of the rice cooking process and boiling maintenance process including the rice cooking capacity determination process performed by the microcomputer.

Once the water absorption process is complete, the cooking process begins and step 5
Perform processing from 0. The processing from step 50 to step 57 here is a processing step for performing rice cooking capacity size window processing. The processing from step 50 to step 57 is similar to the processing from step 20 to step 27 in FIG. 4, so a detailed explanation will be omitted. The explanation will start from the state in which the corresponding count value is set. Step 57
When the determination of the rice cooking capacity is completed in step 58, the process starts from step 58.

In this example, after determining the rice cooking capacity, the rice cooking heater is turned on at the maximum rice cooking power to perform heating, the temperature of the rice cooking pot is detected, and when this temperature reaches the boiling temperature, the rice cooking capacity is determined. The process of switching to the rice cooking power is performed.

When the determination of the rice cooking capacity is completed in step 57, the process moves to step 58, and the rice cooking heater is turned on at the maximum rice cooking power HW. Next, in step 59, it is determined whether or not the temperature of the rice cooking pot has reached the set boiling temperature. If the temperature has not reached the boiling temperature, the process returns to step 58 and the rice cooking heater is turned on with the maximum rice cooking power HW. continue. In step 59, if the boiling temperature has been reached, the process proceeds to step 60 in order to switch to the rice cooking power according to the rice cooking capacity.

In step 60, it is determined whether the content of the T1 counter is less than or equal to m1, and if it is not less than m1, step 6
Proceeding to step 3, it is determined whether the contents of the Tl counter are between m1 and m2. If not m1-m2, step 66
Proceeding to , it is determined whether the contents of the Tl counter are between m2 and m3.

Meanwhile, in step 60, the content of the T1 counter is m
When the rice cooking power is 1 or less, the process proceeds to step 61 and switches to the rice cooking power AW set according to the rice cooking capacity.
Turn on the rice cooker heater.

In the next step 62, it is determined whether the temperature of the rice cooker is 130"C or less, and if the temperature of the rice cooker is 130"C or less, the process returns to step 61 and the rice is cooked with the rice cooking power AW according to the rice cooking capacity. Turn on the heater.

Cook the rice by keeping it boiling. The temperature of the rice cooker is 130
When the temperature reaches 0.degree. C., the cooking and boiling maintenance are completed, so the process proceeds to step 71, the rice cooking heater is turned off, and the process moves on to the next shading process.

Also, in step 63, the contents of the T1 counter are m1 to m.
2, proceed to step 64.

Switch to the rice cooking power BW set according to the rice cooking capacity.

Turn on the rice cooking heater using the rice cooking power BW. In the next step 65, it is determined whether the temperature of the rice cooker is below 130°C. When the temperature of the rice cooker is below 130°C, the process returns to step 64, and the rice heater is turned on with the rice cooking power BW according to the rice cooking capacity to continue cooking rice while maintaining boiling.The temperature of the rice cooker is 130°C. When it is cooked,
Since the boiling maintenance is completed, the process proceeds to step 71, the rice cooking heater is turned off, and the process moves to the next shading process.

Also, in step 66, the contents of the Tl counter are m2 to m.
3, the process proceeds to step 67, switches to the rice cooking power CW set according to the rice cooking capacity, and turns on the rice cooking heater with the rice cooking power CW.In the next step 68, the temperature of the rice cooking pot is 130°C or lower. Determine whether or not. When the temperature of the rice cooking pot is 130°C or lower, the process returns to step 67 and turns on the rice cooking heater with the rice cooking power CW according to the rice cooking capacity.
Cook the rice by keeping it boiling. The temperature of the rice cooker is 13
When the temperature reaches 0° C., the cooking and boiling maintenance are completed, so the process proceeds to step 71, where the rice cooking heater is turned off and the process proceeds to the first unevenness step.

Meanwhile, in step 66, the contents of the Tl counter are m2 to m
If it is not 3, the process proceeds to step 69, where the rice cooking power DW is switched to the rice cooking power DW set according to the rice cooking capacity, and the rice cooking heater is turned on with the rice cooking power DW.

In the next step 70, it is determined whether the temperature of the rice cooker is 130° C. or lower. The temperature of the rice cooker.

When the temperature is below 130° C., the process returns to step 69, and the rice cooking heater is turned on with the rice cooking power DW according to the rice cooking capacity to continue cooking the rice while maintaining boiling. The temperature of the rice cooker is 130℃
When it's done, it's cooked.

Since the boiling maintenance is completed, the process proceeds to step 71, the rice cooking heater is turned off, and the process moves to the next shading process.

As explained above, according to this embodiment, after determining the rice cooking capacity, the rice is not immediately switched to the cooking power according to the rice cooking capacity, but the rice is cooked at the maximum cooking power until the rice reaches near the boiling temperature. After that, the rice cooking power is switched to the rice cooking power according to the rice cooking capacity, so that the temperature rise until the rice cooking pot reaches the boiling temperature can be kept almost constant, and uneven cooking can be eliminated.

In addition, in the rice cooking capacity determination used in this example, when the temperature of the rice cooker reaches a certain temperature of 10, the heating power is turned off for a certain period of time (S seconds), and then the heating power is turned on again and time counting is started. death.

Time counting is stopped when the determination end temperature t3 is reached. The rice cooking capacity is determined based on this time count. By using such a rice cooking capacity determination method together with the rice cooking power control means of this embodiment, in this embodiment,
It has the following characteristics.

(1) The time required to determine the rice cooking capacity becomes short regardless of the rice cooking capacity, and as a result, the rice cooking time can be shortened. This is especially effective when cooking small amounts of rice.

(2) While the temperature of the rice cooker is rising, turn off the electricity to the rice cooker heater to determine the rice cooking capacity.The electricity off time is short, and the period of turning off one electricity is done while the temperature of the rice cooker is low. This eliminates uneven cooking and sticky rice after cooking.

(3) The initial temperature at the start of rice cooking capacity determination is different depending on the rice cooking capacity, and there is a synergistic effect of emphasizing the difference in temperature rise depending on the rice cooking capacity.
It becomes possible to judge the rice cooking capacity more accurately.

(4) In this rice cooking capacity determination, even if environmental conditions change, the determination can be made in a direction that corrects them. In other words.

If the water temperature is low, the counting time corresponding to the rice cooking capacity will be slightly longer, and the rice cooking power will be determined to be higher. If the water temperature is high, the counting time corresponding to the rice cooking capacity will be slightly shorter.
It is determined that the rice cooking power is decreasing, and the rice cooking power that performs the rice cooking control is inevitably corrected.

The present invention has been specifically described above based on examples.
It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

〔Effect of the invention〕

As described above, according to the present invention, the rice cooking power control means, after determining the rice cooking capacity, cooks the rice using the maximum cooking power until the temperature of the rice cooking pot reaches near the boiling temperature, and then, Since the rice cooking power is switched according to the rice cooking capacity, the temperature rise until the rice cooking pot reaches boiling temperature can be kept almost constant, eliminating uneven cooking and rice cooking control that eliminates sticky rice at the bottom of the pot. It can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a microcomputer-controlled rice cooker according to an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of main parts of the control unit. Fig. 3 is a diagram showing an example of a rice cooking temperature curve showing the temperature change of the inner pot when rice is cooked by a microcomputer-controlled rice cooker. A flowchart showing one example of the control operation of the raising process and the boiling maintenance process. FIG. It is. In the figure, 1... Rice cooker body, 2... Inner pot, 3... Inner pot storage container, 4... Rice cooking heater, 5... Temperature sensor, 6... Control unit, 7...・Rice cooking switch, 8・
・・Thermos heater, 10 ・・Microcomputer, 1
1... Energization control means, 12... Commercial AC power supply, 13
...This is a display section.

Claims (3)

[Claims] (1) It has a rice cooking capacity determination means that measures the temperature change of the rice cooking pot and determines the rice cooking capacity using a temperature sensor and a microcomputer installed near the rice cooking pot, and the rice cooking capacity determined by the rice cooking capacity determination means is determined according to the rice cooking capacity determined by the rice cooking capacity determination means. In the microcomputer-controlled rice cooker that cooks rice using the rice cooking power, the rice cooking capacity is determined by the rice cooking capacity determination means, and then the rice is cooked at the maximum rice cooking power until the temperature of the rice cooker reaches near the boiling temperature, and then the rice is cooked according to the rice cooking capacity. A microcomputer-controlled rice cooker characterized in that it is equipped with a rice cooking power control means that switches to a rice cooking power that is different from the original one. (2) The rice cooking power control means cooks rice at the maximum rice cooking power for a predetermined time set according to the rice cooking capacity, and then switches to the rice cooking power according to the rice cooking capacity and cooks the rice. A microcomputer-controlled rice cooker according to claim 1. (3) The rice cooking capacity determining means turns off the heating power for a certain period of time when the temperature of the rice cooker reaches the first temperature, turns on the heating power again, and starts counting from the time when the heating power is turned on; Claim 1, characterized in that the rice cooking capacity is detected by counting the time until the second temperature is reached.
The microcomputer-controlled rice cooker described in Section 1.