JPS63119708A - Cooker - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to cooking appliances such as rice cookers, water heaters, open cookers, etc. for cooking food to be heated in ordinary households.

2. Description of the Related Art A conventional cooker of this type employs a microcomputer 1 and peripheral circuits, as shown in the examples of rice cookers shown in FIGS. 4 and 5. CPU, ROM.

It is a so-called one-chip microcomputer that is made up of RAM, input/output boards, etc. 2 is a first temperature sensor attached to the center of the bottom of the bottomed cylindrical pot 3; 4 is a second temperature sensor attached to the lid 5 that closes the opening of the bottomed cylindrical pot 3; This first temperature sensor 2 and the second temperature sensor
The temperature sensor 4 is connected to the input port of the microcomputer 1 via MU/D converters 6 and 7. As a result, the temperature signals from the first temperature sensor 2 and the second temperature sensor 4 are converted into binary codes and read into the microcomputer 1. Reference numeral 8 denotes a start switch, and an input is made to the microcomputer 1 to determine whether or not the start switch 8 has been pressed. 9
is an AC power source, and a series circuit of a heater 1o and a relay contact 11 for heating food such as rice and water stored in a pot 3 is connected to this AC power source 9. The relay contact 11 is opened and closed by passing a current through the relay coil 13 through the transistor 12. 14 is a DC power supply for operating the circuit described above.

In a cooker configured in this way (a rice cooker is shown here), when the food to be heated, such as rice or water, is placed in the pot 3 and the start switch 8 is pressed, electricity is turned on to the heater 10. The heater 1o is repeatedly energized and de-energized according to the sequence stored in the microcomputer 1 using signals from the first temperature sensor 2 and the second temperature sensor 4, and then the cooking is completed. Ta. and,
If the first temperature sensor 2 or the second temperature sensor 4 is disconnected, the heater 1o is not energized even if the start switch 8 is pressed.

In addition, some cookers use liquid crystal display elements or light emitting diodes to show the cooking process. This means that if the temperature sensor is disconnected, the heater will not be energized and the liquid crystal display element will Problems to be Solved by the Invention However, with such a conventional configuration, it is difficult to see whether the microcomputer or peripheral circuits are damaged and the circuits do not operate. It was not possible to determine whether the temperature sensor was broken or the temperature sensor was disconnected. Furthermore, since temperature sensors are often connected to circuits using connectors, simple disconnection of the connector often occurs, and even in this case, it is not possible to determine whether it is a circuit failure, and if there are multiple temperature sensors. As a result, simple connector disconnections and contact failures often occur, which takes time to analyze failures in the process and in the market.As a result, costs increase due to increased man-hours and repair times increase, resulting in a loss to users. There was a problem with the inconvenience.

The present invention solves these problems, and by detecting each disconnection of a plurality of temperature sensors and displaying each disconnection, it is possible to immediately determine whether it is a circuit failure and improve serviceability. The purpose is to provide a cooking device that can

Determined Means for Solving the Problems In order to solve the above problems, the cooking device of the present invention includes a heater that heats the food to be heated, and a plurality of temperatures that directly or indirectly detect the temperature of the food to be heated. a sensor, a plurality of wire breakage detection means for detecting wire breakage in each of the plurality of temperature sensors; and a plurality of wire breakage display means for displaying a wire breakage in each of the plurality of temperature sensors based on outputs of the plurality of wire breakage detection means. It is constructed by

Effects According to the above configuration, each disconnection of a plurality of temperature sensors can be detected and each disconnection can be displayed, so that it can be immediately determined whether the circuit itself is malfunctioning.
As a result, failures such as incorrect connector insertion or disconnection of temperature sensors during the process can be detected immediately, making it possible to perform failure analysis quickly and smoothly. Furthermore, even if the temperature sensor becomes disconnected or the temperature sensor connector becomes disconnected during use, this can be easily detected, reducing the time required for repairs and improving serviceability. become. With such a simple configuration, it is possible to provide a cooking appliance that can efficiently perform failure analysis in the process and completely improve serviceability.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. Note that in FIGS. 1 to 3, the same parts as in FIGS. 4 and 6 shown in the conventional example are given the same numbers, and the explanation thereof will be omitted.

FIG. 1 shows a liquid crystal display element (hereinafter referred to as LCD) of a rice cooker in one embodiment of the present invention, and 16 is an LC.
D, and Figure 1a shows the display when I and CD15 are all lit.
Figure 1 shows the display when the first temperature sensor 2 of the LCD 15 is disconnected, and Figure 1 C shows the display of the second temperature sensor 4 of the LCD 15.
The following shows the display when the wire is disconnected.

FIG. 2 shows a schematic diagram of a rice cooker according to an embodiment of the present invention, which is composed of a microcomputer 1 and peripheral circuits. The system/D converter 6.7 is composed of a comparator and a resistor, and transmits temperature data from the first temperature sensor 2 and the second temperature sensor 4 to the microcomputer 1.
is inputting to. LCD 15J'j: Connected to the output port of the microcomputer 1.

Next, the operation of the rice cooker configured as above will be explained. FIG. 3 shows a flowchart of a program stored in the ROM in the microcomputer 1, and its operation will be explained according to the steps of the program shown in this flowchart.

First, in step 1, the temperature of the first temperature sensor 2 is measured, in step 2, the temperature of the second temperature sensor 4 is measured and stored, and in step 3, the first temperature sensor 2 is disconnected. If the second temperature sensor 4 is not disconnected, proceed to step 4. Determine whether the second temperature sensor 4 is disconnected. If not, proceed to step 6, and the rice cooking ends. Did you or not? judge,
If the rice has not been finished, the rice is cooked according to the rice cooking sequence stored in the ROM in step 6, and the process returns to step 1. If it is determined in step 6 that the rice cooking has ended, in step 7 the rice is kept warm according to the warming sequence stored in the ROM, and the process returns to step 1. If it is determined in step 3 that the first temperature sensor 2 is disconnected, only "sensor 1" is displayed on the LCD 15 in step 8, and the process proceeds to step 9, where the power supply to the heater 10 is stopped. Return to Further, if it is determined in step 4 that the second temperature sensor 4 is disconnected, the LCD
15 to display only "sensor 2" and proceed to step 9.

In this way, each disconnection of a plurality of temperature sensors is detected and each disconnection is displayed individually, so it can be quickly determined that it is a circuit failure.

Effects of the Invention As described above, according to the present invention, each disconnection of a plurality of temperature sensors is detected and each disconnection is displayed, so that it can be immediately determined whether the circuit itself is malfunctioning. As a result, failures such as incorrect connector insertion or disconnection of temperature sensors during the process can be detected immediately, allowing failure analysis to be carried out quickly and smoothly. Furthermore, even if the temperature sensor is disconnected or the temperature sensor connector is disconnected during use, the user can easily tell, which shortens the repair time and improves serviceability. It is something that can be done.

[Brief explanation of the drawing]

Figures 1a, b, and a are front views of the liquid crystal display of a rice cooker showing an embodiment of the present invention, Figure 2 is a circuit diagram of the rice cooker, and Figure 3 is an example of a program for the rice cooker. Flowchart showing,
FIG. 4 is a circuit diagram of a conventional rice cooker, and FIG. 6 is a cutaway side view of the rice cooker. 1...Microcomputer, 2...
First temperature sensor, 4... Second temperature sensor, 6, 7... Mu/D converter, 10...
・Heater, 16...Liquid crystal display element. 15-511 crystal display element Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] A heater that heats the food to be heated, a plurality of temperature sensors that directly or indirectly detects the temperature of the food to be heated, a plurality of disconnection detection means that detects disconnection of each of the plurality of temperature sensors, and A cooking appliance comprising a plurality of disconnection display means for displaying disconnection of each of the plurality of temperature sensors based on outputs from the plurality of disconnection detection means.