JPH02130383A - Sensor checking of cold storage case - Google Patents

Abstract

PURPOSE:To permit checking through sensors easily after assembling by a method wherein the short-circuit or the disconnection of a sensor circuit is judged from the resistance- temperature relation of the sensors while the detecting value of the sensor is judged whether it satisfies a predetermined temperature relation to check the erroneous mounting place or the erroneous insertion of a connector. CONSTITUTION:The short-circuit or the disconnection of a sensor circuit is judged from the resistance-temperature relations of respective sensors 13-17 while the mistake of mounting place and/or the mistake of the insertion of a connector are judged whether the detecting value of temperature of the sensor satisfies a predetermined temperature relation between a cold storage case and coolers 11, 12 upon cooling operation. When the detecting values of temperature of the sensors 13-17 are deviated remarkably from the range of using temperatures and the resistances thereof are near zero, it is judged as short-circuit from the resistance-temperature relations of the sensors and when the resistances become excessive, it is judged as disconnection. When the detecting values of temperature of respective sensors 13-17 for respective chambers and coolers 11, 12 upon cooling operation coincide with predetermined relations, the assembling of the title cold storage case is judged as normal while it is judged as the erroneous mounting place or the insertion of connector when the detecting values are different from the predetermined relations.

Description

[Detailed description of the invention] (Industrial application field) The present invention is a refrigerator equipped with a plurality of chambers having different temperatures.

This article relates to a method for checking the temperature sensor of a cold storage refrigerator such as a 7JL refrigerator for disconnection, incorrect installation, etc.

(Prior Art) Conventionally, as shown in Fig. 3, a cold storage warehouse equipped with a plurality of chambers having different temperatures has a sensor (13) for detecting temperature in each chamber,
(14) and (15) are provided.

Each cooler (11), (12) is also equipped with temperature detection sensors (16), (17), and the controller (4) controls the temperature in each room based on the temperature values detected by these sensors. It is done. When assembling such sensors, in order to prevent mistakes in the installation location of each sensor, measures such as painting the sensors in different colors or pasting name tags are done, and workers can visually tell whether they have been installed in the correct position or not. checked by.

(Problem to be solved by the invention) As mentioned above, in the past, sensors were checked directly visually, so it was difficult to check again after assembly, and therefore post-assembly checks were rarely performed. Ta. As a result, problems such as installing the sensor in the wrong place, inserting the wrong connector, and disconnecting or shorting the sensor circuit could occur.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and therefore provides a method for checking the temperature sensor of a cold storage refrigerator by easily checking the temperature sensor after assembly.

(Means for Solving the Problems) The feature of the sensor check method according to the present invention is that the check is performed based on the temperature value taken in by each sensor, and short circuit or disconnection of the sensor circuit is determined from the resistance-temperature relationship of each sensor. , If the sensor is installed in the wrong place or the connector is inserted incorrectly, the problem may occur in the refrigerator compartment during cooling operation.
The temperature relationship between the coolers is determined in advance, and the determination is made based on whether the temperature value of each sensor satisfies the above relationship. The determination is made automatically by writing a flowchart into the microcomputer.

(Function) According to the sensor resistance-temperature relationship, when the temperature value of the sensor is far outside the operating temperature range and the resistance is close to O, it is considered a short circuit, and when the resistance becomes excessive, it is considered a disconnection. If the relationship between the temperature values of the sensors of each cooler matches a predetermined relationship, it is normal; if they differ, it is determined that the sensor has been installed in the wrong place or the connector has been inserted incorrectly.

(Example) Next, an example of the present invention will be described with reference to the drawings. FIGS. 2 and 3 show the structure of a cold storage to which the present invention relates, and in the illustrated example, there is a door (2) on the front of the cold storage main body (1).
), on which an inspection lid (3) is provided, and a controller (4) is housed inside.

(5) is a handle for opening and closing the door (2), 6 (6) is a compressor that constitutes the main part of the refrigeration cycle, and (7)
is a blower for circulating cold air. The inside of the refrigerator is divided into a plurality of rooms (8), (9), and (10) with different temperatures, and a cooler (11) is installed in the room (8), and a cooler (12) is installed in the room (10).
) are installed respectively.

A sensor (13), (14) or (15) is installed in each room (8), (9), (10) to detect the air temperature in the room, and also to detect the temperature of the cooler (11). A sensor (16) for detecting the temperature of the cooler (12) and a sensor (17) for detecting the temperature of the cooler (12) are provided. Also, the fourth
As shown, each sensor is connected to the controller (4) by a connector (18). controller(
4) includes a switch (19) for starting the sensor check function, a microcomputer (20) into which a sensor check program is written, and a display section (21).
) exists.

Prior to implementing the sensor check method according to the present invention,
First, the temperature relationship between the chamber and the cooler is determined. For this reason, a line test is conducted after the refrigerator body is assembled. that time,
When the power to the refrigerator is turned on, the compressor (6) is activated first, and the refrigerant is distributed to each cooler (IT).

(12) to cool each chamber. In the cooling operation, if the room temperature is, for example, room (8)>room (9)>room (io).

The temperature of the cooler is cooler (11) > cooler (I2), and the graph shown in Figure 5 is obtained6 In Figure 5, (22) is the temperature detected by the sensor (13), and (23) is The temperature detected by the sensor (14), (24) is the temperature detected by the sensor (15), (2
5) is the temperature detected by the sensor (16) and (26
) is the temperature detected by sensor (17). In addition, Figure 6 shows the relationship between the electrical resistance and temperature of each sensor, and it is judged at a value that is far outside the operating temperature range, and when the resistance value is almost 0, it is considered a short circuit, and the resistance value If the value becomes excessive, it is determined that the wire is disconnected.

Fig. 1 shows a flowchart of the sensor checking method according to the present invention, where ■ in Fig. 1 is for checking for disconnections and short circuits in the sensor circuit, and ■ is for checking for incorrect installation of the sensor and incorrect insertion of the connector. Show check.

First, when you press the switch (19), '1' will appear on the display (21).
-''' is displayed at an appropriate time interval, for example, 3 seconds, and a sensor failure check is performed based on the resistance-time relationship shown in Figure 6.If there is a disconnection or short circuit in any sensor circuit, it indicates that the sensor is defective. Number II E nl
” will be displayed and return to ■ again. Continue this process until there is no longer any sensor defect. If it is normal, II Q A
11 is displayed and the process proceeds to the first stage.

■ is cooling operation, when the switch (19) is pressed, 2~ will be displayed on the display (21), 6 to start the compressor (6), and then when the switch (19) is pressed again, 11 will be displayed on the display (21).
3 Display I+ for, for example, 3 seconds, and each sensor (13)
The temperature values of ~(17) are read into the microcomputer (20). Next, these values are compared with the relationship between temperature values recorded in advance, and in the case of the cold storage with the structure shown in FIG. 3, if the temperature value of each sensor satisfies the following relationship, it is determined to be normal.

Sensor (13) > Sensor (14) > Sensor (15)
Sensor (16) > Sensor (17) Sensor (13) > Sensor (16) Sensor (15) > Sensor (17) If the above relationship is not satisfied, the sensor may have been installed in the wrong location or the connector (I8) may have been inserted incorrectly. It is judged as a mistake and an error II E I+ is displayed.

(Effects of the Invention) As described above, according to the present invention, the sensors are checked not by directly looking at the sensors, but by using the temperature values taken in by each sensor, making it possible to check easily and with high reliability. Furthermore, you can check for disconnections, short circuits, incorrect installation locations, and incorrect connector connections after the cooler is assembled.
The product quality of cold storage can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a flowchart of the sensor check method according to the present invention, FIG. 2 is a front view of an example of a cold storage box in which the present invention is implemented, FIG. 3 is a diagram showing the internal structure of the cold storage box, and FIG. 4 is a diagram showing the internal structure of the cold storage box. The wiring diagram of the controller, FIG. 5 is a graph showing the relationship between each temperature sensor and time, and FIG. 6 is a graph showing the relationship between temperature sensor resistance and time.

Claims (1)

[Claims] In the method for checking the sensors of a cold storage including a sensor that detects the air temperature in a plurality of rooms with different temperatures and a sensor that detects the temperature of each cooler, it is determined whether the sensor circuit is short-circuited or not based on the resistance-temperature relationship of each sensor. Determine the disconnection, predetermine the temperature relationship between those chambers and coolers during cooling operation, determine whether the values of each of the sensors satisfy the above-mentioned planned temperature relationship, and determine the installation location of the sensor. A sensor checking method for a cold storage refrigerator, which is characterized by checking for mistakes and incorrect connector insertion.