JPS6164214A - Jar rice cooker - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a jar rice cooker that has a built-in microcomputer (hereinafter referred to as microcomputer) and has a function of determining the amount of rice cooked from the rate of temperature rise during rice cooking. .

Conventional structure and its problems In recent years, in order to cook more delicious rice, microcomputers have been installed, and a heating sequence has been implemented that mimics the so-called ``starting slowly, middle popping, popping eruption...'' However, in order to effectively implement this method, it is necessary to determine the amount of rice to be cooked and supply the amount of heating commensurate with the amount of rice to be cooked.

However, in conventional jar rice cookers, the amount of rice to be cooked is determined by comparing a single reference time sequence and the time it takes to pass between two predetermined temperatures. If the initial temperature of the product is significantly different from normal, a large difference may occur in the temperature rise curve, and an appropriate amount of rice to be cooked may not be determined, resulting in an inappropriate amount of heating.

purpose of invention The present invention solves the above-mentioned conventional problems.

To provide a jar rice cooker capable of supplying an appropriate heating amount according to the content capacity by considering the initial temperature even when the initial temperature of the inner pot or the contents is significantly different from normal.

Structure of the Invention In order to achieve the above object, the jar rice cooker of the present invention includes a temperature detection means for detecting the cooking temperature, and the temperature detected by the temperature detection means reaches a second predetermined temperature from a first predetermined temperature. a storage means for storing a plurality of reference time sequences; and an initial temperature classification means for classifying the temperature detected by the temperature detection means at the beginning of rice cooking into N temperature categories. , a reference time sequence selection means for inputting the output of the initial temperature classification means and selecting one reference time sequence from among the plurality of reference time sequences stored in the storage means; Rice cooking amount determining means for determining the amount of cooked rice by comparing the output of the timing means;
It is equipped with a heating amount control means that controls the heating amount based on the result of rice cooking amount determination.With this configuration, rice cooking can be started not only from a normal initial temperature, but also from an initial temperature that is significantly different from normal. Even in such a case, it is possible to correctly determine the amount of cooked rice and control and supply an appropriate amount of heating.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic cross-sectional view of the rice cooker, in which 1 is the main body, and 2 is a lid rotatably attached to the main body 1 so as to cover the opening of the inner pot 3. An annular cast-in heater 4 is disposed at the inner bottom of the main body 1, and a temperature detecting means 6 is attached to the central opening of the heater 4 so as to come into elastic contact with the outer bottom surface of the inner pot 3. Fig. 2 shows a block diagram constituting the main part of the present invention, and 6 is a temperature detection means for detecting the temperature of the inner pot or the contents of the inner pot, which is the same as that shown in Fig. 1. It is.

Reference numeral 6 denotes an initial temperature classification means for classifying the temperature detected by the temperature detection means 6 into N temperature categories at the beginning of rice cooking. Reference numeral 7 denotes a storage means, which stores N reference time sequences from the first to the Nth. Reference numeral 8 denotes a reference time sequence selection means, which selects the n-th reference time sequence from among the reference time sequence group stored in the storage means 7 when the initial temperature is in the n-th temperature division by the initial temperature classification means 6. Select the reference time column. Reference numeral 9 denotes a timer means, which measures the time from the first predetermined temperature to the second predetermined temperature higher than the first predetermined temperature based on the output of the temperature detection means 5. 10 is a rice cooking amount determining means.

The amount of cooked rice is determined by comparing the output of the timer 9 with the n-th reference time sequence. Reference numeral 11 denotes a heating amount control means, which controls the amount of heating in the heating 7-can based on the result of determining the amount of rice cooked.

Next, the operation of this embodiment will be explained. Figure 3 shows an example of how the temperature at the bottom of the pot changes over time when rice is cooked with a constant electric power.First, after the rice starts cooking, the initial temperature is separated, and then heating continues until the first predetermined temperature is reached. . If the first predetermined temperature and the second predetermined temperature are selected within a range where the rate of temperature increase is stable and linear, the time T1 required to pass between these two temperatures will be approximately proportional to the amount of rice cooked. .

FIG. 4 shows an experimental example of the relationship between the amount of cooked rice and the time required to pass between two temperatures using the initial water temperature as a parameter. The initial temperature is θ1<θ2×θ3×θ, where the initial temperature θ2 is a normal temperature, the initial temperature θ1 is a temperature lower than normal, the initial temperature 03 is a temperature higher than normal, and the initial temperature θ4 is a temperature significantly higher than normal. It is. Multiple reference time sequences are created based on this data. Next, when the second predetermined temperature is reached, the time T1 required to go back and forth between the two temperatures is compared with one reference time series selected from multiple reference time series according to the initial temperature. Then, determine the amount of cooked rice. The rice cooking amount determination result obtained in this way is used for controlling the heating amount in the subsequent heating sequence.

As described above, according to this embodiment, the reference time sequence is selected according to the initial temperature of rice cooking.

The amount of cooked rice can be determined correctly even when the initial temperature is different from normal.

Effects of the Invention As described above, the jar rice cooker of the present invention includes an initial temperature classification means for classifying the temperature of the inner pot or its contents at the initial stage of rice cooking into N temperature categories, and a standard corresponding to the classified initial temperature. a reference time sequence selection means for selecting a time sequence; a timekeeping means for measuring the time required to pass between two predetermined temperature points; Since it is equipped with a means for determining the amount of cooked rice by comparison and a means for determining the amount of cooked rice and a heating amount control means for controlling the amount of heating based on the result of determining the amount of cooked rice, even if the initial temperature is different from normal, Appropriate heating control can be performed by determining the amount of cooked rice. For example, if the initial temperature is significantly higher than normal, the rice may become too soft.
Or, conversely, it is possible to perform optimal heating control that takes into account both the initial temperature and the amount of rice to be cooked, and to cook good rice without making the rice grainy.

[Brief explanation of the drawing]

Figure 1 is a schematic elevational view of a jar rice cooker according to an embodiment of the present invention, Figure 2 is a perspective view of the main parts of the jar rice cooker, and Figure 3 is the temperature at the bottom of the pot in the jar rice cooker. FIG. 4 is a characteristic diagram showing data used for determining the amount of cooked rice in an embodiment of the present invention. 1...Body, 2...Lid, 3...
・Inner pot, 4... Heater, 5... @ degree detection means, 6... Initial temperature classification means, 7...
. . . Storage means, 8 . . . Reference time sequence selection means, 9
. . . Timing means, 10 . . . Cooking amount determination means. 11... Heating amount control means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 3 Rishi Figure 4 Cooking rice □

Claims (1)

[Claims] Temperature detection means for detecting the cooking rice temperature; time measurement means for measuring the time until the temperature detected by the temperature detection means reaches a second predetermined temperature from a first predetermined temperature; and a plurality of reference time sequences. an initial temperature classification means for classifying the temperature detected by the temperature detection means into N stages of temperature classification at the initial stage of the start of rice cooking; and an output of the initial temperature classification means is inputted and stored in the storage means. a reference time sequence selection means for selecting one reference time sequence from among a plurality of reference time sequences; and a rice cooking amount determination means for comparing the selected reference time sequence and the output of the timer means to determine the amount of cooked rice. and,
A jar rice cooker comprising heating amount control means for controlling the amount of heating based on the result of determining the amount of rice to be cooked.