JPH074317B2 - rice cooker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker which controls the heating state of the rice cooker by using a microcomputer.

[0002]

2. Description of the Related Art Conventionally, rice cookers have been widely known in which the electricity to the rice cooker heater is controlled by a microcomputer to control the heating so that the temperature of the rice cooker changes according to a predetermined rice cooker temperature curve. (For example, JP-A-60
-See the 193417 publication).

In the case of the rice cooker in which the temperature is controlled by the microcomputer as described above, for example, as shown in FIG. 9, the rice cooker temperature curve L ₀ and the actual rice cooker temperature which are the reference in the heating process before boiling is reached. comparing the curve L _1, and the time of rice device temperature curve L ₁ exceeds the cooking temperature curve L ₀ (i.e., off-time power supply to the cooking heater is stopped) t (off), rice device temperature curve The time when L ₁ is below the rice cooking temperature curve L ₀ (that is, the ON time during which the rice cooking heater is energized) t (o
n) is integrated in a predetermined range, and the off time t (off)
Alternatively, the amount of cooked rice is generally determined based on the integrated value of the on-time t (on).

However, in the case of the method of comparing the rice cooker temperature curve and the rice cooker temperature curve as described above, no problem occurs when the rice cooker and the rice cooker heater are in normal contact with each other, but When rice is cooked with foreign matter such as rice grains caught on the contact surface with the rice cooker (that is, foreign matter cooked), the center sensor erroneously detects that the temperature rises quickly and the rice cooker temperature curve has an error. Occurrence may occur, and the rice may be misjudged as a small amount even though it is actually full. If such an erroneous determination is made, the cooked rice may not be cooked properly because the core remains.

Therefore, the weight of the rice cooker as a whole is measured, the amount of rice cooked is estimated from the total weight, and the energization control of the rice cooker heater is performed according to the estimated amount of rice cooked. Attempts have been made to resolve it (for example,
(See JP-A-59-20124).

In the case of rice cooking control by the above-mentioned weight judgment,
There is a fact that the cooked state of rice is not good compared with the case of rice cooking control based on the above-mentioned temperature curve judgment, although foreign matter rice can be dealt with. This means that the rice cooking control based on the temperature curve judgment is the most suitable for the state of the contents of the rice cooker during the heating process, whereas the rice cooking control based on the weight judgment corresponds to the rice cooking control during the heating process. This is probably because it is difficult to adapt to the condition of the object. In other words, there is a conflicting requirement that rice cooking control based on temperature curve determination is desirable to cook delicious rice, and rice cooking control based on weight determination is desirable to cope with foreign rice cooking.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conflicting requirements, and combines rice cooking control by temperature curve determination and rice cooking control by weight determination. The purpose is to cook delicious rice while dealing with rice cooked with foreign substances.

[0008]

In the invention of claim 1, as means for solving the above-mentioned problems, the rice cooker 3 set in the container body X is heated by the rice cooker heater 9 so that the inside of the rice cooker 3 is heated. In a rice cooker that cooks the contents stored in the rice cooker, temperature detecting means 5 for detecting the temperature T of the rice cooker 3
0, the first determination means 61 for comparing the rice cooking temperature curve L ₀ preset within the preset rice cooking amount determination range with the rice cooker temperature T detected by the temperature detecting means 50, The rice cooker temperature T is determined by the first determining means 61.
Is lower than the rice cooking temperature curve L ₀ , the energization control means 62 energizes the rice cooking heater 9 only, and the total energization amount to the rice cooking heater 9 by the energization control means 62 determines the a first cooking quantity calculating means 63 for calculating a first estimated rice amount W _1, and the weight detection means 32 for detecting the total weight W ₀ of the container body X, the total weight W ₀ detected by the weight detection means 32 a second cooking quantity calculating means 64 for calculating a second estimated rice amount W ₂ in the rice device 3, rice device in炊上up process based on the first estimated rice weight W ₁ and the second estimated rice weight W ₂ The rice cooking control means 65 for controlling the heating state of No. 3 is attached.

According to the second aspect of the invention, as a means for solving the above-mentioned problems, the rice cooker 3 set in the container body X is used.
In a rice cooker that cooks the contents stored in the rice cooker 3 by heating the rice cooker 9 with the rice cooker 9, a temperature detecting means 50 that detects the temperature T of the rice cooker 3 and a preset rice cooked amount determination Within the range for the rice cooker temperature curve L ₀ set in advance and the rice cooker temperature T detected by the temperature detecting means 50, the first judging means 61, and the rice cooker by the first judging means 61. An energization control unit 62 that energizes the rice cooking heater 9 only when it is determined that the temperature T is lower than the rice cooking temperature curve L ₀ , and the energization control unit 62.
The first rice cooking amount calculation means 63 for calculating the first estimated rice cooking amount W ₁ in the rice cooker 3 from the total energization amount to the rice cooking heater 9 and the weight detecting means 3 for detecting the total weight W ₀ of the container body X.
2 and the total weight W detected by the weight detection means 32
_Second calculating the second estimated rice cooking amount W ₂ in the rice cooker 3 from ₀
Rice cooking amount calculation means 64, the first estimated rice cooking amount W ₁ and the second
When the second determining means 66 for comparing the estimated rice cooking amount W ₂ and the second determining means 66 determine that they match each other, the cooking step based on the first estimated rice cooking amount W ₁ The cooked rice for controlling the heating state of the rice cooker 3 in the case of controlling the heating state of the rice cooker 3 in the cooking process based on the second estimated rice cooking amount W ₂ when it is determined that they are different from each other. The control means 67 is attached.

According to a third aspect of the invention, as a means for solving the above-mentioned problems, in the rice cooker according to the first or second aspect, the rice cooker 3 in the water absorbing step based on the second estimated rice cooking amount W ₂ is used. Water absorption control means 6 for controlling the heating state
8 is attached.

According to the invention of claim 4, as means for solving the above-mentioned problems, in the rice cooker according to claim 1, 2 or 3, the cooked temperature Ts is set in accordance with the second estimated rice cooking amount W _2. A temperature changing means 69 for changing is attached.

[0012]

According to the first aspect of the invention, the following actions can be obtained by the above means.

That is, the first estimated rice-cooking amount calculated by the first rice-cooking amount calculation means 63 (that is, the rice-cooking amount determined based on the rice-cooking temperature curve L ₀ ) W ₁ and the second rice-cooking amount calculation means 64 The heating state of the rice cooker 3 in the cooking process is controlled based on the calculated second estimated rice cooking amount (that is, the rice cooking amount determined based on the total weight W ₀ of the container body X) W _2. .

According to the second aspect of the invention, the following effects can be obtained by the above means.

That is, the first estimated rice-cooking amount calculated by the first rice-cooking amount calculation means 63 (that is, the rice-cooking amount determined based on the rice-cooking temperature curve L ₀ ) W ₁ and the second rice-cooking amount calculation means 64 When the second estimated rice cooking amount (that is, the rice cooking amount determined based on the total weight W ₀ of the container body X) W ₂ matches (that is, the rice cooker 3 and the rice cooking heater 9 are normally operated). During normal rice cooking that is in contact), rice cooker 3 in the cooking process
The heating state of No. 1 is controlled based on the first estimated rice cooking amount W ₁ , while the first estimated rice cooking amount W ₁ and the second estimated rice cooking amount W ₂ are different (that is, the rice cooker). 3 and rice cooker 9
During the cooking of foreign matter that is not normally in contact with and, the heating state of the rice cooker 3 in the cooking process is controlled based on the second estimated rice cooking amount W ₂ .

According to the invention of claim 3, the following effects can be obtained by the above means.

That is, the heating state of the rice cooker 3 in the water absorption step is controlled based on the second estimated rice cooked amount W ₂ calculated by the second rice cooked amount calculating means 64.

According to the invention of claim 4, the following effects can be obtained by the above means.

That is, the cooked temperature Ts of the rice is changed and corrected according to the second estimated rice cooking amount W ₂ calculated by the second rice cooking amount calculation means 64.

[0020]

According to the invention of claim 1, the first estimated rice cooked amount calculated by the first rice cooked amount calculating means 63 (that is, the rice cooked amount determined based on the rice cooking temperature curve L ₀ ) W ₁ and Second
Second estimated rice cooking amount calculated by the rice cooking amount calculation means 64
Since the heating state of the rice cooker 3 in the cooking process is controlled based on (that is, the amount of cooked rice determined based on the total weight W ₀ of the container body X) W ₂ , If an error occurs in the estimated rice weight W ₁ also becomes to be rice controlled based on the first estimated rice weight W ₁ and the second estimated rice weight W ₂ to minimize said error, due to incorrect determination It has an excellent effect of preventing defective rice cooking.

According to the second aspect of the present invention, the first estimated rice-cooking amount calculated by the first rice-cooking amount calculation means 63 (that is, the rice-cooking amount determined based on the rice-cooking temperature curve L ₀ ) W ₁ and the second When the second estimated rice cooked amount calculated by the rice cooked amount calculation means 64 (that is, the rice cooked amount determined based on the total weight W ₀ of the container body X) W ₂ matches (that is, the rice cooker 3 and During normal rice cooking in which the rice cooking heater 9 is in normal contact), the heating state of the rice cooker 3 in the cooking process is determined by the first estimated rice cooking amount W ₁
On the other hand, when the first estimated rice cooking amount W ₁ and the second estimated rice cooking amount W ₂ are different from each other (that is, the rice cooker 3 and the rice cooking heater 9 are normally in contact with each other). When cooking rice with no foreign substances), set the heating state of the rice cooker 3 during the cooking process to the second
Since so as to control based on the estimated rice amount W _2, at the time of normal cooking, with cook a delicious rice by cooking control according to the first estimated rice amount W _1, which is determined on the basis of the cooking temperature curve L _0, the foreign matter During rice cooking, there is an excellent effect that defective rice cooking due to erroneous determination can be prevented by rice cooking control based on the second estimated rice cooking amount W ₂ determined based on the total weight W ₀ of the container body X.

According to the invention of claim 3, the heating state of the rice cooker 3 in the water absorption step is controlled based on the second estimated rice cooking amount W ₂ calculated by the second rice cooking amount calculating means 64. Since water is absorbed according to the amount of cooked rice, there is an excellent effect that an ideal water absorption state can be obtained.

According to the invention of claim 4, the cooking temperature Ts of the rice can be changed according to the second estimated rice cooking amount W ₂ calculated by the second rice cooking amount calculating means 64.
Since it is possible to cook at a cooking temperature according to the amount of rice cooked, it is possible to prevent kogation when cooking a small amount of rice and to prevent premature cutting when cooking a large amount of rice.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Embodiment 1 FIGS. 1 to 4 show a rice cooker according to Embodiment 1 of the present invention. The present embodiment relates to claims 1, 3 and 4.
It corresponds to the invention of.

The rice cooker of this embodiment is used for both rice cooking and heat retention. As shown in FIG. 2, a rice cooker having a bottomed cylindrical shape is constructed so that the rice cooker 3 can be set therein. The container main body X includes an outer case 1 and a lid unit 2 that covers the upper portion of the outer case 1.

The outer case 1 is composed of a cylindrical cover member 4 formed of a thin metal plate, and a shoulder member 5 and a bottom member 6 made of synthetic resin, which are connected to the upper and lower ends of the cover member 4, respectively. It is configured, and inside thereof, a bottomed cylindrical inner container 7 for removably setting the rice cooker 3 is provided.

At the center of the bottom surface of the inner container 7, there is provided a center sensor 8 whose top surface comes into contact with the bottom surface of the rice cooker 3. An annular rice cooking heater 9 heats the center sensor 8 so as to surround it. It is arranged so as to be embedded in the panel 10.
Inside the center sensor 8, a thermistor which detects the temperature of the rice cooker 3 described later, a sensor which detects whether or not the rice cooker 3 is set, and the like are incorporated.

The lid unit 2 is formed in a hollow structure by an outer cover 11 made of synthetic resin forming the outer peripheral surface and an inner cover 12 made of synthetic resin forming the inner peripheral surface. The inner cover 12 and the inner cover 12 are joined to each other with high airtightness by high frequency welding or the like. The lid unit 2 is rotatably attached to one side of the shoulder member 5 via a hinge mechanism 13, and its open end side is engaged with a predetermined position of the lid unit 2, Lid unit 2
A lock mechanism 14 for maintaining the closed state is provided.

Further, in the substantially central portion of the lid unit 2,
A steam outlet 15 is provided, and a one-touch pin mounting hole 16 is formed in the lower portion of the steam outlet 15. A rubber one-touch packing 17 is attached to the one-touch pin attachment hole 16.

Further, an inner lid 18 for closing the upper opening of the rice cooker 3 is provided below the lid unit 2, and the inner lid 18 is provided at the center of the inner lid 18. A pressure adjusting device 21 for letting the steam introduced into the space 20 above the inner lid 18 to the outside through a steam port 19 formed in a proper position.
The one-touch pin 22 incorporating the is fixed. The one-touch pin 22 is detachably attached to the one-touch packing 17. In other words, the inner lid 18 is attached to the lid unit 2 via the one-touch pin 22.
It is supposed to be detachably attached to. The space between the lid unit 2 and the inner lid 18 is sealed by a seal packing 23 attached to the peripheral portion of the inner cover 12 to prevent steam from leaking to the outside from other than the pressure regulator 21. ..

A heat insulating heater 24 is provided on the outer surface of the side peripheral portion of the inner container 7, and a shoulder heater 25 is provided at a portion of the shoulder member 5 to which the inner lid 18 is joined. . The warming heater 24 is mainly used to keep warm cooked rice and prevent spoilage, and the shoulder heater 25 is used.
Is used to heat the inner lid 18 by heat conduction to evaporate the water droplets generated on the surface thereof and prevent the water droplets from falling into the rice cooker 3.

However, in the rice cooker of this embodiment,
A plurality of parts for supporting the container body X are provided at appropriate positions of the bottom member 6.
(For example, four support legs 26, 26 ...) Are provided so as to be relatively movable in the vertical direction. Each of the support legs 26 is supported by a support plate 28, which is provided on a pair of protrusions 27, 27 protruding from the top surface of the bottom member 6, so as to be vertically movable via a spring 29. Further, an operating rod 30 which extends through the through hole 28a formed in the supporting plate 28 and extends upward is integrally provided at the center of the supporting leg 26. Further, at a position facing the upper end of the operating rod 30,
A piezoelectric element type weight detection means 32 is provided via a bracket 31 fixed to the support plate 28. The weight detecting means 32 is a cooked rice housed in the rice cooker 3.
(Or, the total weight of the container body X containing rice and water) is detected, and the detected amount is output as an electric signal. In addition to the piezoelectric element type as the weight detecting means 32,
A strain gauge type or capacitance type can also be adopted. In the case of the present embodiment, the weight detecting means 32 is provided so as to correspond to each support leg 26.
In some cases, it is provided so as to correspond to a pair of diagonally located 6,26.

On the other hand, between the inner container 7 and the outer case 1, a rice cooking heater 9, a heat retaining heater 24 and a shoulder heater 25 are provided.
A microcomputer 33 for controlling power supply to the power source is housed. In addition to the normal rice cooking, the shoulder member 5 includes switches 35 for selecting a cooking menu such as a quick cooking operation that omits a soaking step and cooking porridge, and setting a timer. , A timer setting display 36 and a display means 3 for displaying the contents in the rice cooker 3
An operation unit 34 having the number 7 (see FIG. 3) is provided.

Next, the electrical construction of the rice cooker of this embodiment will be described with reference to the electric circuit diagram shown in FIG.
The parts corresponding to the parts shown in FIG. 2 are designated by the same reference numerals.

The electric power from the commercial AC power supply 38 is fed through a temperature fuse 39 (not shown in FIG. 2) that detects abnormal heating of the rice cooker 3 and blows it off. While being supplied to the shoulder heater 25,
The voltage is stepped down by the step-down transformer 40, rectified by the rectifier 41, and supplied to the microcomputer 33 as its power supply.

The rice cooking heater 9 and the warming heater 24 are connected in series, and the rice cooking heater 9 and the warming heater 24 are connected in parallel to the shoulder heater 25. Further, a normally open contact 42a of the relay 42 is connected to the warming heater 24 and the rice cooking heater 9 in parallel. The relay coil 42b of the relay 42 is turned on / off by a command from the microcomputer 33.
Excitation / demagnetization is controlled by the FF-controlled NPN transistor 43. Reference numeral 44 is a diode for thermally consuming and absorbing the counter electromotive force generated when the relay coil 42b is demagnetized.

Triacs 45 and 46 are connected between the heat retaining heater 24 and the commercial AC power source 38 and between the shoulder heater 25 and the commercial AC power source 38, respectively. The gates of these triacs 45 and 46 are turned on / off by a command from the microcomputer 33.
Control signals from PNP transistors 47 and 48 to be controlled are to be given.

The microcomputer 33 operates on the basis of the clock signal from the reference frequency generation circuit (OSC) 49, and operates the transistor 4 according to a predetermined program.
3, 47, and 48 are controlled to control power supply to the rice cooking heater 9, the warming heater 24, and the shoulder heater 25. This power supply control is performed based on the output signal from the thermistor 50 which is built in the center sensor 8 and acts as a temperature detecting means and the output signal from the weight detecting means 32. Reference numeral 51 is a sensor for detecting whether or not the rice cooker 3 is set, and 52 is a thermostat.

Further, the microcomputer 33 is connected to the switches 35, a timer setting indicator 36 composed of a liquid crystal display element and the like, and a display means 37. The display means 37 is composed of a light emitting diode and has a display function of about three levels of large amount, medium amount and small amount.

The microcomputer 33 of this embodiment is
As shown in FIG. 1, a first determining means 61 for comparing a preset rice cooking temperature curve L ₀ with a rice cooker temperature T detected by the thermistor 50 within a preset range for determining the amount of cooked rice. An energization control unit 62 that energizes the rice cooking heater 9 only when the first determination unit 61 determines that the rice cooker temperature T is lower than the rice cooking temperature curve L ₀ .
Total energization amount to the rice cooking heater 9 by the energization control means 62
[In the case of the present embodiment, the first rice cooking amount calculation means 6 for calculating the first estimated rice cooking amount W ₁ in the rice cooker 3 from the cumulative energization time Σt (on)]
3, the container main body second cooking amount calculating means for calculating a second estimated rice amount W ₂ of said rice unit 3 from the total weight W ₀ detected by the weight detecting means 32 for detecting the total weight W ₀ of the X 64, a cooking control means 65 for controlling the heating state of the food unit 3 in炊上up process based on the first estimated rice weight W ₁ and the second estimated rice weight W _2, the second estimated rice weight W
_{The functional} means including the water absorption control means 68 for controlling the heating state of the rice cooker 3 in the water absorption step based on ₂ and the temperature changing means 69 for changing the cooked temperature Ts according to the second estimated rice cooking amount W _2. I have it.

In the case of this embodiment, the cooked rice temperature curve L ₀ and cooked temperature Ts are read from the ROM incorporated in the microcomputer 33.

Next, the operation of the rice cooker of this embodiment during rice cooking will be described.

FIG. 5 shows an ideal temperature change of the rice cooker 3 during the rice cooking operation.

According to this, the rice cooking operation includes a water absorption step (I) in which the rice absorbs water at a predetermined temperature, a cooking step (II) in which the rice is heated to a boiling state, and a boiling step in which the boiling state is maintained.
(III) and the steaming step (IV) of steaming the cooked rice
Includes and.

The ideal heating condition of the rice cooker 3 varies depending on the amount of cooked rice, for example, the length of the boiling step (III) and the boiling step.
It is known that delicious rice can be cooked by setting the electric power supplied to the rice cooking heater 9 in (III) according to the amount of rice cooked. On the other hand, in the cooking step (II), it has been empirically known that the rice can be cooked deliciously by causing a substantially constant temperature change regardless of the amount of cooked rice.

In this embodiment, the amount of cooked rice is determined at a predetermined time Δts (for example, 4 minutes after the temperature of the rice cooker 3 reaches 71 ° C.) during the cooking process (II), and then the cooked rice amount is determined. The heating control in the boiling step (III) is performed according to the determined amount of cooked rice. That is, in the present embodiment, the rice cooking temperature curve L based on the curve of FIG.
_0, is an enlarged該炊rice temperature curve L ₀ has a FIG.

Next, referring to the flow charts shown in FIGS. 6 to 8, the water absorption step (I) to the cooking step (II)
The control in I) will be described.

The water absorption step (I) is performed according to the flow chart shown in FIG.

When the rice cooker 3 is set in the container body X,
In step S ₁ , the information from the weight detecting means 32 and the thermistor 50 (that is, the total weight W ₀ of the container body X and the temperature T of the rice cooker) is input to the microcomputer 33, and in step S ₂ , the total weight W _{0 is changed} to the second value. The estimated amount of cooked rice W ₂ is calculated. The control is performed by the second rice cooking amount calculation means 6
4 is performed.

Then, in steps S ₃ and S ₄ , the second estimated rice cooking amount W ₂ calculated in step S ₂ is determined.

When it is determined in step S ₃ that the second estimated rice cooking amount W ₂ is not less than the predetermined value M ₁ (for example, 6 go),
The rice cooking heater 9 and the heat retaining heater 24 are turned on at a predetermined power supply duty ratio of 10/14 and 4/14 until the rice cooker temperature T reaches 60 ° C. or more, and when the temperature T ≧ 60 ° C., the rice cooking heater 9 and the heat retaining heater are heated. after 24 are both OFF, the process proceeds to the left 15 minutes in water step (I) is completed (step S ₅ ~S _8), next炊上up step (II). Here, the rice cooking heater 9 and the warming heater 24 are energized by the relay 42 being turned on by the conduction of the transistor 43 according to a command from the microcomputer 33. The power supply duty ratio means the time during which the rice cooking heater 9 or the warming heater 24 is energized, and indicates, for example, how many seconds the transistor 43 is turned on in a 14-second cycle.

In step S ₃ , the second estimated rice cooking amount W ₂ is determined to be less than the predetermined value M ₁ , and in step S ₄ the second estimated rice cooking amount W ₂ is determined to be the predetermined value M ₂ (for example, 3 go) or more. In such a case, the rice cooking heater 9 and the warming heater 24 are turned on at predetermined power supply duty ratios of 7/14 and 7/14 until the rice cooker temperature T reaches 50 ° C. or higher, and the rice is cooked when T ≧ 50 ° C. Both the heater 9 and the heat retention heater 24 are OF
After being treated with water, it is left for 12 minutes to complete the water absorption step (I).
(Steps S _{9 to} S ₁₂ ), the process proceeds to the next cooking step (II).

If it is determined in step S ₄ that the second estimated rice cooking amount W ₂ is less than the predetermined value M ₂ , the rice cooker temperature T is 4
Rice cooker 9 and warmer heater 24 until the temperature rises above 0 ° C
Is turned on at a predetermined power supply duty ratio of 4/14 and 10/14, and when T ≧ 40 ° C., both the rice cooking heater 9 and the heat retention heater 24 are turned off, and then left for 9 minutes to perform the water absorption step (I). There completed (step S ₁₃ ~S _16), it proceeds to the next炊上up step (II).

As described above, in the present embodiment, the heating state of the rice cooker 3 in the water absorption step (I) (in other words, the second estimated rice cooking amount W ₂ (in other words, the actual rice cooking amount)) Output control of the rice cooking heater 9 and the heat retention heater 24,
Since the holding temperature and the holding time) are controlled, an ideal water absorption state according to the amount of cooked rice can be obtained.

Next, the cooking step (II) will be described with reference to the flowcharts shown in FIGS. 7 and 8.

[0056] Proceeding to炊上up step after the water absorption step (I) (II), in step S _17, cooking heater 9 is turned ON by the power supply duty ratio 14/14. Then, step S ₁₈
In, it is determined whether or not the rice cooker temperature T exceeds 71 ° C., and if it is 71 ° C. or less, power is continuously supplied to the rice cooking heater 9 at a power supply duty ratio of 14/14,
When it exceeds 71 ° C., the process proceeds to step S ₁₉ .

In step S ₁₉ , the first judging means 6
1, the rice cooker temperature T is compared with the point on the rice cooking temperature curve L ₀ (see FIG. 9) at that time. A predetermined time tn is stored in the memory (not shown) built in the microcomputer 33.
A reference temperature Tm (m = 1, 2, 3, ...) Indicating each point of the rice cooking temperature curve L ₀ for each (for example, 10 seconds) is stored as a table, and the rice cooker temperature for each predetermined time tn described above. T and the reference temperature Tm are compared in step S ₁₉ .

[0058] The results of this comparison, if it is determined that T> Tm, the process proceeds to step S _20, power supply to the cooking heater 9 to shut off the transistor 43 is stopped, further, rice heater in step S ₂₁ The cumulative time Σt (off) of the power supply stop time to 9 is integrated.

If it is determined in step S ₁₉ that T ≦ Tm, the process proceeds to step S ₂₂ and the transistor 43
Conduction continues for, at the feed duty ratio 14/14 power supply to the cooking heater 9 is performed, the accumulated time of the power feed time to the cooking heater 9 .SIGMA.t (on) is integrated further in step S _23. The control is performed by the energization control means 62.

Next, in step S ₂₄ , the elapse of the predetermined time tn is waited, and after the elapse of the predetermined time tn, it is determined in step S ₂₅ whether the parameter m has reached the predetermined value n. determination is made, the value of the parameter m is, if you have not yet reached the predetermined value n, the parameter m is incremented in step S _26, the similar process is performed for the new m.

By the way, in order to perform heating control so as to follow a constant rice cooking temperature curve L ₀ (see FIG. 9) regardless of the rice cooking amount, the power supply time to the rice cooking heater 9 is lengthened as the rice cooking amount increases. from where it is necessary, the above steps S ₁₇ ~S ₂₆
On-state cumulative time Σt (o
n) is proportional to the amount of cooked rice in the rice cooker 3. In addition,
The off-state cumulative time Σt (off) is inversely proportional to the amount of cooked rice. Therefore, the first estimated rice cooking amount W ₁ can be determined by comparing the on-state cumulative time Σt (on) with the set value.

Therefore, at step S ₂₇ , Σt (on) =
Replacing with W ₁ , the first estimated rice cooking amount W ₁ is determined in steps S ₂₈ and S ₂₉ .

In step S ₂₈ , the first estimated rice cooking amount W ₁
Is determined to be equal to or greater than a predetermined value M ₁ (for example, 6 go), A = 7 is set in step S _{30 and} it is determined that the first estimated cooked rice amount W ₁ is less than the predetermined value M ₁ in step S ₂₈ . Is
In step S ₂₉ , the first estimated rice cooking amount W ₁ is the predetermined value M.
If it is determined that the number is ₂ (for example, 3 go) or more, step S
Sets A = 5.5 in _31, sets the A = 4 in step S ₃₂ when the first estimated rice amount W ₁ is determined to be less than the predetermined value M ₂ in step S _29. Here, A is the rice cooking heater 9 according to the first estimated rice cooking amount W _1.
Power supply time (that is, the transistor 43
Is the numerical value (that is, the numerator of the above-mentioned power supply duty ratio).

Then, step S ₃₃ and step S ₃₄
In step S ₂ , the second estimated rice cooking amount W ₂ calculated is read and the determination is made.

In step S ₃₃ , the second estimated rice cooking amount W ₂
Is determined to be equal to or larger than the predetermined value M ₁ (for example, 6 go), B = 7 is set in step S ₃₅ , and step S ₃₃
In the second estimation rice amount W ₂ is determined to be less than the predetermined value M _1, the second estimated rice amount W ₂ is predetermined value M ₂ (e.g., 3 Go) in step S ₃₄ step when it is determined that more than S sets B = 5.5 at _36, sets the B = 4 in step S ₃₇ if the second estimated rice weight W ₂ in step S ₃₄ is determined to be less than the predetermined value M _2. Here, B is the rice cooking heater 9 according to the second estimated rice cooking amount W _2.
Power supply time (that is, the transistor 43
Is the numerical value (that is, the numerator of the above-mentioned power supply duty ratio).

The power supply duty ratio to the rice cooking heater 9 is determined based on the numerical values A and B set as described above.
(Step _S38 ). In this embodiment, the power supply duty ratio is
(A + B) / 14.

Therefore, the first estimated rice cooking amount W ₁ calculated by the first rice cooking amount calculating means 63 and the second rice cooking amount calculating means 64.
At the time of normal rice cooking in which the second estimated rice cooking amount W ₂ calculated by the above is in agreement, the power supply duty ratio of the rice cooking heater 9 at the time of large amount (ie 6 or more) rice is 14/14, and the medium amount ( That is, the feeding duty ratio of the rice cooking heater 9 during rice cooking is 11/14, and the feeding duty ratio of the rice cooking heater 9 during small amount (ie less than 3 rice) is 8/14. .

On the other hand, the first estimated rice cooking amount W ₁ calculated by the first rice cooking amount calculation means 63 and the second estimated rice cooking amount W ₂ calculated by the second rice cooking amount calculation means 64 are different from each other. during cooking, the first estimated rice amount W ₁ is less than the second estimated rice weight W _2, for example, the second estimated rice weight W ₂
When the first estimated rice cooking amount W ₁ is erroneously determined to be a small amount in the case of a large amount of rice, the power supply duty ratio of the rice cooking heater 9 is 11/14, and the first estimated rice cooking amount W ₁ becomes Power supply duty ratio of the rice cooking heater 9 determined based only on
It is 3/14 larger than (ie, 8/14). Therefore, even when cooking rice with foreign matter, defective rice cooking such as leaving a core in the rice does not occur.

In this embodiment, in step S ₃₉ , the power supply duty ratio (14-A
-B) / 14.

Further, in step S ₄₀ , it is judged whether or not the cooker temperature T is the cooked temperature Ts (= 120 + A + B) ° C., and the cooker temperature T is the cooked temperature Ts.
When the temperature reaches, the power supply to the rice cooking heater 9 and the heat retention heater 24 is stopped (step S ₄₁ ), and the process proceeds to the steaming step (IV). Here, the cooking temperature Ts is to be changed according to the amount of rice cooked in the rice cooker 3, and as a result,
Prevents kogation due to overrun when cooking a small amount of rice, or prevents defective cooking due to premature cutting when cooking a large amount of rice. The above control is performed by the temperature changing means 68. In the case of this embodiment, the cooking temperature Ts is 128 ° C to 1
It is supposed to be changed within the range of 34 ℃, but above
By replacing (A + B) with another numerical value, the temperature change range can be set appropriately.

Embodiment 2 FIG. 10 shows functional means of a microcomputer in a rice cooker according to Embodiment 2 of the present invention. The present embodiment corresponds to the inventions of claims 2, 3 and 4.

The microcomputer 33 of this embodiment is
As shown in FIG. 10, a first determination unit 61 that compares a preset rice cooking temperature curve L ₀ with a rice cooker temperature T detected by the thermistor 50 within a preset rice cooking amount determination range. An energization control unit 62 that energizes the rice cooking heater 9 only when the first determination unit 61 determines that the rice cooker temperature T is lower than the rice cooking temperature curve L _0.
And the total energization amount to the rice cooking heater 9 by the energization control means 62 [in the present embodiment, the cumulative energization time Σt (on)] from the rice cooker 3
A first cooking quantity calculating means 63 for calculating a first estimated rice amount W ₁ of the inner, weight detecting means 32 the rice unit 3 from the total weight W ₀ detected by detecting the total weight W ₀ of the container main body X
A second cooking quantity calculating means 64 for calculating a second estimated rice amount W ₂ of the inner, and the second determining means 66 for comparing the first estimated rice weight W ₁ and the second estimated rice weight W _2, said If the two determining means 66 determine that the two match, then the first
The heating state of the rice cooker 3 in the cooking process is controlled based on the estimated rice cooking amount W ₁ , and when it is determined that they are different from each other, the cooking process is performed based on the second estimated rice cooking amount W _2. Rice control means 67 for controlling the heating state of the rice cooker 3 in
When the water-absorbing control unit 68 for controlling the heating state of the food unit 3 in the second estimated rice weight W ₂ water process based on the temperature change the炊上up temperature Ts in response to the second estimate rice weight W ₂ The functional means including the changing means 69 is provided.

The other structure is the same as that of the first embodiment, and the description thereof will be omitted to avoid duplication.

Next, referring to the flow chart shown in FIG. 11, the rice cooking control of the rice cooker according to the second embodiment of the present invention will be described.

In the case of this embodiment, the first estimated rice cooking amount W ₁ in the water absorption step (I) and the cooking step (II) is calculated (that is,
The control up to step S ₂₇ ) in the flowchart of FIG. 7 is the same as that in the first embodiment. Only the subsequent rice cooking control will be described below.

In steps S ₅₁ and S ₅₂ , the first estimated rice cooking amount W ₁ is determined.

In step S ₅₁ , the first estimated rice cooking amount W ₁
Is determined to be equal to or greater than the predetermined value M ₁ (for example, 6 go), it is determined in step S ₅₃ whether or not the second estimated rice cooking amount W ₂ is equal to or greater than the predetermined value M ₁ (for example, 6 go). Is done,
If it is determined that W ₂ ≧ M ₁ , the process proceeds to step S ₅₄ ,
The first estimated rice cooked amount W ₁ calculated by the first rice cooked amount calculation means 63 and the second estimated rice cooked amount by the second rice cooked amount calculation means 64
Since the estimated rice cooking amount W ₂ matches, the rice cooking heater 9 supplies the power supply duty ratio 14 / based on the first estimated rice cooking amount W _1.
It is turned on at 14. At this time, the heat retention heater 24 is in the OFF state.

Then, in step S ₅₅ , the rice cooker temperature T
It is judged whether or not the cooking temperature is Ts (= 140 ° C), and the rice cooker temperature T is the cooking temperature Ts (= 140 ° C).
When reaching, the power supply to the rice cooking heater 9 is stopped (step S ₅₆ ), and the process proceeds to the steaming process (IV).

In step S ₅₃ , the second estimated rice cooking amount W ₂
Is determined to be less than the predetermined value M ₁ , step S ₅₇
In the second estimated rice cooking amount W ₂ is a predetermined value M ₂ (for example, 3 go)
If it is determined whether or not the above is true and it is determined that W ₂ ≧ M ₂ , the process proceeds to step S ₅₈ , and the first estimated rice cooking amount W ₁ calculated by the first rice cooking amount calculation means 63 and the first estimated rice cooking amount W ₁ are calculated. Since the second estimated rice cooking amount W ₂ calculated by the second rice cooking amount calculation means 64 is different, the rice cooking heater 9 is turned on at the power supply duty ratio 11/14 based on the second estimated rice cooking amount W ₂ . The heat retention heater 24 is turned on at a power supply duty ratio of 3/14.

Then, in step S ₅₉ , the rice cooker temperature T
It is determined whether or not the cooking temperature is Ts (= 136 ° C), and the rice cooker temperature T is the cooking temperature Ts (= 136 ° C).
When reaching, the power supply to the rice cooking heater 9 and the heat retention heater 24 is stopped (step S ₆₀ ), and the process proceeds to the steaming process (IV).

In step S ₅₇ , the second estimated rice cooking amount W ₂
When it is determined that is less than the predetermined value M ₂ (for example, 3 go), the process proceeds to step S ₆₁ , and the first estimated rice cooking amount W ₁ and the second rice cooking amount calculation calculated by the first rice cooking amount calculation means 63. Since the second estimated rice cooking amount W ₂ calculated by the means 64 is different, the rice cooking heater 9 is based on the second estimated rice cooking amount W _2.
Is turned on at a power supply duty ratio of 7/14, and the heat insulation heater 2
4 is turned on at a power supply duty ratio of 7/14.

Then, in step S ₆₂ , the rice cooker temperature T
It is judged whether or not the cooking temperature is Ts (= 132 ° C), and the rice cooker temperature T is the cooking temperature Ts (= 132 ° C).
When reached, the energization of the cooking heater 9 and thermal insulation heater 24 is stopped (Step S _63), the process proceeds steaming in step (IV).

[0083] Further, in the case where the first estimation cooker amount W ₁ is determined to be less than the predetermined value M ₁ step S _51, the first estimated cooker amount in step S ₅₂ W ₁ a predetermined value M ₂ (e.g.,
If it is determined that W ₁ ≧ M _2, it is determined in step S ₅₃ that the second estimated cooked rice amount W ₂ is a predetermined value M ₁ (for example, 6 cases) or more. If it is determined that W ₂ ≧ M ₁ , it proceeds to step S ₅₄ , and the first estimated rice cooking amount W ₁ and the second estimated rice cooking amount W ₁ calculated by the first rice cooking amount calculation means 63. Since the second estimated rice cooking amount W ₂ calculated by the rice cooking amount calculation means 64 is different, the rice cooking heater 9 is turned on at the power supply duty ratio 14/14 based on the second estimated rice cooking amount W ₂ . Heat insulation heater 24 at this time
Is in the OFF state.

Then, in step S ₅₅ , the rice cooker temperature T
It is judged whether or not the cooking temperature is Ts (= 140 ° C), and the rice cooker temperature T is the cooking temperature Ts (= 140 ° C).
When reaching, the power supply to the rice cooking heater 9 is stopped (step S ₅₆ ), and the process proceeds to the steaming process (IV).

In step S ₅₃ , the second estimated rice cooking amount W ₂
Is determined to be less than the predetermined value M ₁ , step S ₅₇
In the second estimated rice cooking amount W ₂ is a predetermined value M ₂ (for example, 3 go)
If it is determined whether or not the above is true and it is determined that W ₂ ≧ M ₂ , the process proceeds to step S ₅₈ , and the first estimated rice cooking amount W ₁ calculated by the first rice cooking amount calculation means 63 and the first estimated rice cooking amount W ₁ are calculated. Since the second estimated rice cooked amount W ₂ calculated by the 2 rice cooked amount calculating means 64 matches, the rice cooker heater 9 is turned on at the power supply duty ratio 11/14 based on the first estimated rice cooked amount W ₁ to keep warm. The heater 24 is turned on with a power supply duty ratio of 3/14.

Then, in step S ₅₉ , the rice cooker temperature T
It is determined whether or not the cooking temperature is Ts (= 136 ° C), and the rice cooker temperature T is the cooking temperature Ts (= 136 ° C).
When reaching, the power supply to the rice cooking heater 9 and the heat retention heater 24 is stopped (step S ₆₀ ), and the process proceeds to the steaming process (IV).

In step S ₅₇ , the second estimated rice cooking amount W ₂
When it is determined that is less than the predetermined value M ₂ (for example, 3 go), the process proceeds to step S ₆₁ , and the first estimated rice cooking amount W ₁ and the second rice cooking amount calculation calculated by the first rice cooking amount calculation means 63. Since the second estimated rice cooking amount W ₂ calculated by the means 64 is different, the rice cooking heater 9 is based on the second estimated rice cooking amount W _2.
Is turned on at a power supply duty ratio of 7/14, and the heat insulation heater 2
4 is turned on at a power supply duty ratio of 7/14.

Then, in step S ₆₂ , the rice cooker temperature T
It is judged whether or not the cooking temperature is Ts (= 132 ° C), and the rice cooker temperature T is the cooking temperature Ts (= 132 ° C).
When reached, the energization of the cooking heater 9 and thermal insulation heater 24 is stopped (Step S _63), the process proceeds steaming in step (IV).

[0089] Further, in the case where the first estimation cooker amount W ₁ is determined to be less than the predetermined value M ₁ step S _52, in step S ₅₃ second estimated rice amount W ₂ is predetermined value M ₁ (e.g., 6 It is determined whether or not the above is satisfied, and W ₂ ≧ M ₁
And when it is determined, the process proceeds to step S _54, the second estimated rice amount W calculated by the first estimated rice weight W ₁ and the second cooking amount calculating means 64 calculated by the first cooking amount calculation means 63 ₂ is different, the rice cooking heater 9 is turned on at the power supply duty ratio 14/14 based on the second estimated rice cooking amount W _2.
To be done. At this time, the heat retention heater 24 is in the OFF state.

Then, in step S ₅₅ , the rice cooker temperature T
It is judged whether or not the cooking temperature is Ts (= 140 ° C), and the rice cooker temperature T is the cooking temperature Ts (= 140 ° C).
When reaching, the power supply to the rice cooking heater 9 is stopped (step S ₅₆ ), and the process proceeds to the steaming process (IV).

In step S ₅₃ , the second estimated rice cooking amount W ₂
Is determined to be less than the predetermined value M ₁ , step S ₅₇
In the second estimated rice cooking amount W ₂ is a predetermined value M ₂ (for example, 3 go)
If it is determined whether or not the above is true and it is determined that W ₂ ≧ M ₂ , the process proceeds to step S ₅₈ , and the first estimated rice cooking amount W ₁ calculated by the first rice cooking amount calculation means 63 and the first estimated rice cooking amount W ₁ are calculated. Since the second estimated rice cooking amount W ₂ calculated by the second rice cooking amount calculation means 64 is different, the rice cooking heater 9 is turned on at the power supply duty ratio 11/14 based on the second estimated rice cooking amount W ₂ . The heat retention heater 24 is turned on at a power supply duty ratio of 3/14.

Then, in step S ₅₉ , the rice cooker temperature T
It is determined whether or not the cooking temperature is Ts (= 136 ° C), and the rice cooker temperature T is the cooking temperature Ts (= 136 ° C).
When reaching, the power supply to the rice cooking heater 9 and the heat retention heater 24 is stopped (step S ₆₀ ), and the process proceeds to the steaming process (IV).

In step S ₅₇ , the second estimated rice cooking amount W ₂
When it is determined that is less than the predetermined value M ₂ (for example, 3 go), the process proceeds to step S ₆₁ , and the first estimated rice cooking amount W ₁ and the second rice cooking amount calculation calculated by the first rice cooking amount calculation means 63. Since the second estimated rice cooking amount W ₂ calculated by the means 64 matches, the rice cooking heater 9 is based on the first estimated rice cooking amount W _1.
Is turned on at a power supply duty ratio of 7/14, and the heat insulation heater 2
4 is turned on at a power supply duty ratio of 7/14.

Then, in step S ₆₂ , the rice cooker temperature T
It is judged whether or not the cooking temperature is Ts (= 132 ° C), and the rice cooker temperature T is the cooking temperature Ts (= 132 ° C).
When reached, the energization of the cooking heater 9 and thermal insulation heater 24 is stopped (Step S _63), the process proceeds steaming in step (IV).

As described above, in the case of this embodiment, the first estimated cooked rice amount W ₁ calculated by the first cooked rice amount calculating means 63.
When the second estimated rice cooking amount W ₂ calculated by the second rice cooking amount calculation means 64 matches, the heating state of the rice cooker 3 is controlled based on the first estimated rice cooking amount W ₁ , and the first rice cooking The first estimated rice cooking amount W ₁ calculated by the amount calculating means 63 and the second estimated rice cooking amount W ₂ calculated by the second rice cooking amount calculating means 64.
DOO when the the are differences, since the heated state of the food unit 3 based on the second estimated rice amount W ₂ is in the to be controlled, the normal cooking, heating control in accordance with the cooking temperature curve L ₀ This makes it possible to cook delicious rice and prevent defective rice by heating control based on weight judgment when cooking foreign matter.

In the case of this embodiment as well, the cooking temperature Ts is changed according to the amount of rice cooked in the rice cooker 3, which causes kogation due to overrun during small amount rice cooking. Prevents or prevents defective cooking due to premature cutting during large-scale rice cooking.

Embodiment 3 FIG. 12 shows a portion of the rice cooker according to Embodiment 3 of the present invention in which the weight detecting means is installed. In this example,
The invention corresponds to the inventions of claims 1, 2, 3 and 4.

In the case of this embodiment, the weight detecting means 32 has three
It is composed of contact switches.

That is, the weight detecting means 32 of the present embodiment has three leaf spring contacts arranged vertically at a predetermined interval at a position facing the upper end of the operating rod 30 erected from the supporting leg 26. It is composed of 32a, 32b and 32c. With such a configuration, the leaf spring contacts 32a, 32b, 32c are brought into contact with each other after the leaf spring contacts 32a, 32b are brought into contact with the upward movement of the operating rod 30. Therefore, when the leaf spring contacts 32a, 32b, 32c are in contact with each other, the total weight of the container main body A exhibits the maximum weight (in other words, the amount of cooked rice W ₂ is large), and the leaf spring contacts 32a, 32b.
When only the container is in contact, the total weight of the container body A shows a medium amount (in other words, the amount of cooked rice W ₂ is medium amount), and when the leaf spring contacts 32a, 32b, 32c are both open, By setting the biasing force of the spring 29 so that the total weight of the main body A is small (in other words, the amount of cooked rice W ₂ is small), the function as the weight detecting means 32 can be exhibited. Of.

The other constructions and effects are the same as those of the first embodiment.
The description is omitted because it is the same as.

The invention of the present application is not limited to the configuration of each of the above-described embodiments, and it goes without saying that the design can be appropriately changed without departing from the gist of the invention.

[Brief description of drawings]

FIG. 1 is a functional correspondence diagram showing a control function during rice cooking in a rice cooker according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the rice cooker according to the first embodiment of the present invention.

FIG. 3 is a front view showing the operation portion of the rice cooker according to the first embodiment of the present invention.

FIG. 4 is an electric circuit diagram showing an electric configuration of the rice cooker according to the first embodiment of the present invention.

FIG. 5 is a characteristic diagram showing a temperature change of a general rice cooker during rice cooking.

FIG. 6 is a flowchart showing control in a water absorption step of the rice cooker according to the first embodiment of the present invention.

[Fig. 7] Fig. 7 is a flowchart showing the first half of control during rice cooking by the rice cooker according to the first embodiment of the present invention.

[Fig. 8] Fig. 8 is a flowchart showing the latter half of the control of the rice cooker according to the first embodiment of the present invention during rice cooking.

FIG. 9 is an enlarged view of a portion for determining the amount of cooked rice in FIG. 5.

FIG. 10 is a functional correspondence diagram showing a control function during rice cooking in the rice cooker according to the second embodiment of the present invention.

FIG. 11 is a flowchart showing a main part of control at the time of rice cooking of the rice cooker according to the second embodiment of the present invention.

FIG. 12 is a cross-sectional view of a portion where the weight detecting means is installed in the rice cooker according to the third embodiment of the present invention.

[Explanation of symbols]

3 is a rice cooker, 9 is a rice cooking heater, 32 is a weight detecting means, 33
Is a microcomputer, 50 is a temperature detecting means (thermistor), 61 is a first judging means, 62 is an energization controlling means, 6
3 is a first rice cooking amount calculation means, 64 is a second rice cooking amount calculation means,
Reference numeral 65 is a rice cooking control means, 66 is a second determination means, 67 is a rice cooking control means, 68 is a water absorption control means, 69 is a temperature changing means,
A is the container body, T is the rice cooker temperature, Ts is the cooking temperature, L ₀ is the rice cooking temperature curve, W ₀ is the overall weight, W ₁ is the first estimated rice cooking amount,
W ₂ is the second estimated rice cooking amount.

Claims (4)

[Claims] 1. A rice cooker (3) set in a container body (X)
In a rice cooker that cooks the contents stored in the rice cooker (3) by heating the rice cooker (9), a temperature detecting means (50) for detecting the temperature (T) of the rice cooker (3). )When,
The rice cooking temperature curve (L ₀ ) and the temperature detecting means (5) set in advance within the range for determining the amount of rice cooking set in advance.
A first judging means for comparing a rice device temperature (T) detected by 0) (61), the rice device temperature by the first determination means (61) (T) is the cooking temperature curve (L ₀₎ An energization control means (62) for energizing the rice cooking heater (9) only when it is determined to be lower, and a rice cooking heater by the energization control means (62)
First estimated rice cooking amount in the rice cooker (3) from the total energizing amount to (9)
First rice cooking amount calculation means (63) for calculating (W ₁ ) and weight detection means (3) for detecting the total weight (W ₀ ) of the container body (X).
2) and a second rice cooking amount calculation means (64) for calculating a second estimated rice cooking amount (W ₂ ) in the rice cooker (3) from the total weight (W ₀ ) detected by the weight detecting means (32). ) And the first estimated rice cooking amount (W ₁ ) and the second estimated rice cooking amount (W ₂ ) based on the first estimated rice cooking amount (W ₁ ) and the heating state of the rice cooker (3) in the cooking process.
(65) is attached to the rice cooker. 2. A rice cooker (3) set in the container body (X)
In a rice cooker that cooks the contents stored in the rice cooker (3) by heating the rice cooker (9), a temperature detecting means (50) for detecting the temperature (T) of the rice cooker (3). )When,
The rice cooking temperature curve (L ₀ ) and the temperature detecting means (5) set in advance within the range for determining the amount of rice cooking set in advance.
A first judging means for comparing a rice device temperature (T) detected by 0) (61), the rice device temperature by the first determination means (61) (T) is the cooking temperature curve (L ₀₎ An energization control means (62) for energizing the rice cooking heater (9) only when it is determined to be lower, and a rice cooking heater by the energization control means (62)
First estimated rice cooking amount in the rice cooker (3) from the total energizing amount to (9)
First rice cooking amount calculation means (63) for calculating (W ₁ ) and weight detection means (3) for detecting the total weight (W ₀ ) of the container body (X).
2) and a second rice cooking amount calculation means (64) for calculating a second estimated rice cooking amount (W ₂ ) in the rice cooker (3) from the total weight (W ₀ ) detected by the weight detecting means (32). ), The second estimated means (66) for comparing the first estimated rice cooking amount (W ₁ ) with the second estimated rice cooked amount (W ₂ ) and the second determining means (66) If it is determined that the rice is present, the first estimated rice cooking amount (W ₁ )
Based on the above, the heating state of the rice cooker (3) in the cooking process is controlled, and when it is determined that they are different from each other, in the cooking process based on the second estimated rice cooking amount (W ₂ ). Rice cooker
A rice cooker characterized by being provided with a rice cooker control means (67) for controlling the heating state of (3). 3. The water absorption control means (68) for controlling the heating state of the rice cooker (3) in the water absorption step based on the second estimated rice cooking amount (W ₂ ) is attached. Alternatively, the rice cooker described in 2. 4. The temperature changing means (69) for changing the cooking temperature (Ts) according to the second estimated rice cooking amount (W ₂ ) is attached, and the temperature changing device (69) is attached. Rice cooker.