JPH0289923A - Cooking appliance - Google Patents

Abstract

PURPOSE:To perform an analysis of defects within a short period of time, shorten a repairing time and improve a service work by a method wherein a short-circuited state of a temperature sensor is detected and displayed. CONSTITUTION:For example, in a rice cooker, as a cooking switch 4 is turned on, a micro-computer 1 turns ON a heater 6 so as to start a rice cooking operation. Then, a temperature of a temperature sensor 2 is measured so as to judge whether the temperature sensor 2 is short-circuited or not. In case that no short-circuited condition is found, it is judged if a rice cooking is completed, and if the rice cooking is not completed, a measurement of temperature through the temperature sensor 2 is carried out. In case of completed rice cooking operation, the heater is turned OFF to terminate the rice cooking operation. In case that it is judged that the temperature sensor 2 is short-circuited, the heater 6 is turned OFF and for example a short-circuited state displaying device 14 is lit.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention detects a short circuit in a temperature sensor and displays 1.
[Prior Art] FIG. 3 shows an example of a conventional cooking device 2, such as a rice cooker.

This will be explained using FIG.

In the same figure, (1) is OPU, RAM, R
OM.

A microcomputer consisting of an input/output board, etc.

(2) is attached to the center of the bottom of the pot (3) and is 7j N
A temperature sensor using a TC thermistor is connected to the input port of the microcomputer (1). From this sum, the temperature signal from the temperature sensor (2) is converted into a digital value and processed by the A/D converter inside the microcomputer fil.

(4) is a cooking switch connected to the input port of the microcomputer (1), and (5) is an AC power source. A heater (6) that is housed inside the pot (3) and heats objects to be heated such as rice or water and a relay contact (7) are connected in series to this AC power source (5), and the microcomputer (1) A signal from the output port causes current to flow through the relay coil (9) through the transistor (8), thereby opening and closing the relay contact (7). 01 is the power supply that supplies current to the t circuit described above; 11! +, na is resistance.

Next, the operation will be explained. When you put something to be heated such as rice or water into the pot (3) and press the cooking switch (5), the microcomputer is activated by the signal from the temperature sensor (2).
According to the rice cooking sequence stored in the rice cooker, the heater (6) is energized and de-energized to perform cooking.

[Problem to be solved by the invention]

However, in the conventional cooker configured as described above, if the temperature sensor (2) is short-circuited by water droplets or the like, the microcomputer (1) determines that the temperature is high and no heating is performed. However, there is no way to notify that the temperature sensor (2) is short-circuited, and the user may not notice that there is an abnormality. It is difficult to distinguish between malfunctions and peripheral circuit failures, takes a long time to repair, and causes inconvenience to users.

The present invention has been made to solve the above-mentioned problems, and detects a short circuit in a temperature sensor.

The button displays this to notify the user of the abnormality.

To provide a cooking appliance that can easily distinguish malfunctions from malfunctioning circuits and improve serviceability.

[Means to solve the problem]

The cooking appliance according to the present invention includes a temperature sensor that directly or indirectly detects the temperature of the object to be heated, and includes a short-circuit detection means for detecting a short circuit of the temperature sensor, and a detection output of the short-circuit detection means to detect a short circuit of the temperature sensor. The device is also equipped with display means for indicating a short circuit.

[Effect]

According to this invention, a short circuit in a temperature sensor is detected.

By displaying this, it is possible to notify that the temperature sensor is short-circuited, and the user can be informed of the abnormality. Furthermore, it is possible to immediately determine whether a circuit is malfunctioning, and failure analysis can be done in a short time, which shortens the repair period and improves serviceability.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to the diagrams.

FIG. 1 shows a circuit diagram of a rice cooker according to an embodiment of the present invention, in which the microcomputer (2) inputs temperature data to the microcomputer (1) using a temperature sensor. ) is connected to the input port of the microcomputer (1) with a cooking switch.(5) is connected in series with a heater (6) that heats the object using an AC battery and a relay contact (7). 1)
The output signal causes a current to flow through the relay coil (9) through the transistor (8), which causes the relay contact (7) to flow.
is opened and closed. 111.113. α3 resistance, a4 resistance
, KD, etc., detects a short circuit in the temperature sensor (2) and, when detected, displays this short circuit.

I will explain the next VC@ work. FIG. 2 shows a flowchart of the program stored in the ROM of the microcomputer (1). First, in step sr, heater f6 is
Turn on 1 and cook f! i, @Start the work. Next, in step S2, the temperature of the temperature sensor (2) is measured, and in the next step S3, it is determined whether or not the temperature sensor (2) is short-circuited. If it is not short-circuited, in step S4, the rice cooking is completed or not. If the rice cooking has not been completed, the process returns to step S2, and in step S5, the station where the rice cooking has been completed turns the heater OFF and completes the rice cooking operation.

If it is determined that the temperature sensor (2) is short-circuited in step S5, the heater is turned off in step S6.
,.

Next, in step S7, the short circuit display device α is turned on.

In the above embodiment, a short circuit of the temperature sensor (2) is indicated by a dedicated short circuit display device 0, and a third display device such as an LED or LCDK is provided to display the process etc., which is normally displayed in a specific cooker. Not displayed.

For example, a short circuit indication may be made by blinking all the indications.

〔Effect of the invention〕

As described above, according to the present invention, a short circuit in the temperature sensor is detected and displayed.

It is possible to notify the user of an abnormality, and also to immediately determine whether it is a circuit failure.Failure analysis can be performed in a short time, and the repair period can be shortened.

We can provide inexpensive cooking equipment that can improve serviceability.

[Brief explanation of drawings]

Figure 1 of the bottle is a circuit diagram of a cooker with a button according to an embodiment of the present invention.
The second figure is a flowchart showing an example of the program of the rice cooker, the third figure is the circuit diagram of the conventional rice cooker, and the t44 figure is a broken side view of the same rice cooker. The temperature sensor and all are short-circuit indicating devices.

Claims (1)

[Claims] In a cooking appliance having a temperature sensor that directly or indirectly detects the temperature of a heated object, a short-circuit detection means for detecting a short-circuit in the temperature sensor, and a display indicating a short-circuit in the temperature sensor based on a detection output of the short-circuit detection means A cooking device characterized by being equipped with means.