KR101986325B1 - Apparatus and method for maintaining optimal storage temperature of fresh cargo using reefer container - Google Patents

Abstract

The present invention is characterized in that a plurality of sensor tags capable of wireless communication are installed in a freezing container freight cargo bay and the temperature of the freight container proper setting is changed flexibly on the basis of the temperature inside the cargo loading part, A container body which forms a cargo loading section capable of loading cargo; and a control unit which is installed in a closed space on one side of the container body, and controls the air supplied from the refrigeration module A sensor tag mounted on at least two or more of the cargo mounts for outputting the actual temperature measured by measuring the temperature inside the cargo mount through wireless communication; The actual temperature value in the cargo loading section output from the sensor tag is used to determine the freezing container A controller for calculating a proper set temperature and generating a control signal for adjusting the flow direction of the air entering the cargo loading unit in the refrigeration unit to maintain the calculated appropriate set temperature; And at least one drive switch unit for switching the path of the air circulation passage connected to the inside of the cargo stacking unit with the air generated by the refrigeration module of the refrigeration unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for maintaining optimal storage temperature of a fresh cargo using a freezing container,

The present invention relates to a freezing container, and in particular, to maintain the optimal storage temperature of a fresh cargo, a proper setting temperature of the freezing container is automatically changed during transportation based on the temperature inside the cargo loading container of the refrigeration container carrying the fresh cargo, And an apparatus and a method for maintaining an optimum storage temperature.

Generally, refrigerated containers are used as warehouses that store refrigerated goods such as foods that require refrigeration or freezing, or foods such as agriculture, water, and livestock products that require freshness at low temperatures, .

A conventional refrigeration container having a function of controlling the temperature inside the cargo loading portion of the container is provided with a cooling unit including a heater and a cooler that keeps the cargo loading temperature constant during transportation. The air cooled or warmed by the cooling unit is supplied to the cargo loading portion of the container to circulate the cargo loading portion of the container and then recycled to the cooling unit to maintain the temperature at the cargo loading portion of the container I will.

The refrigerated container maintains the inside temperature of the cargo loading section based on the temperature sensor installed inside the refrigeration unit so that the temperature inside the cargo loading section can be maintained at a predetermined set temperature.

However, in the case of a 40ft refrigerator container, when the temperature is maintained based on the temperature sensor installed in the refrigeration unit, there is a problem that it is difficult to maintain the optimum storage temperature of the fresh cargo due to a variation between the temperature inside the cargo loading box and the temperature set by the controller.

Therefore, it takes a long time to adjust the internal temperature of the cargo container based on the pre-set refrigerator container setting temperature to adjust the optimum storage temperature of the cargo, thereby breaking the cold chain of the fresh cargo at the initial stage of cargo transportation, Lt; / RTI >

Patent Registration No. 10-1286565 (registered on January 10, 2013)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a refrigerator having a plurality of sensor tags capable of wireless communication, So that the temperature inside the cargo loading box can be maintained at the optimal storage temperature of the fresh cargo.

Other objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided an apparatus for maintaining optimal storage temperature of a fresh cargo using a freezing container, comprising: a container body constituting a cargo loading unit capable of loading cargo; A refrigeration unit installed in the cargo loading unit to supply air of cool or warm air supplied from the freezing module into the cargo loading unit of the container main body; And an actual temperature value in the cargo loading section output from the sensor tag is used to calculate a proper set temperature of the freezing container, A control signal is generated to control the direction of air flow from the unit to the cargo hold At least one or more of the at least one drive circuit for opening or closing the path of the air circulation passage connected to the inside of the cargo stacking portion by air of warm or cool air generated in the refrigeration module of the refrigeration unit based on the control signal generated by the control portion, And a switch unit.

Preferably, the control unit controls the temperature of the air supplied to the cargo loading unit in the refrigeration unit by setting the proper set temperature of the refrigeration container through the refrigeration container temperature control algorithm based on the actual temperature value in the cargo loading unit delivered from the sensor tag .

Preferably, the freezing unit includes a freezing container freezing module including a cooler, a heater, and a circulating motor that can be independently operated according to the internal state of the cargo loading unit, and a controller for controlling the temperature of the air, And a first and a second temperature sensor unit for sensing the temperature of the air circulating through the loading unit and returning to the freezing unit.

Preferably, the air circulation passage serves as a passage through which the air of the freezing unit flows into the cargo carrying section, and the air circulation passage is formed in the lower part of the freezing container, and the longitudinal section is formed as a 'T' .

According to an aspect of the present invention, there is provided a method of maintaining an optimal storage temperature of a fresh cargo using a refrigeration container, the method comprising: (A) using a plurality of sensor tags attached inside a refrigeration container freight cargo, Collecting the collected indoor temperature data and transferring the collected indoor temperature data to the control unit via wireless communication; and (B) calculating a proper refrigeration container setting temperature using the delivered actual temperature data in the cargo hold (C) generating a control signal for controlling the flow of air flowing into the cargo loading unit in the refrigeration unit to maintain the calculated appropriate set temperature in the control unit; and (D) Occurs in the refrigeration module of the refrigeration unit through switching of at least one of the driving switch parts Key is that comprising the step of circulating the air in the warm or cool air into the air circulation passage through to the inner part cargo.

Preferably, the step (B) includes the steps of: (B1) preliminarily setting an optimal storage temperature, a low temperature failure temperature, and a high temperature failure temperature data of the fresh cargo to calculate a proper set temperature for the refrigerator container for maintaining the optimal storage temperature of the fresh cargo; (B2) selecting a temperature (reference temperature, lower limit and upper limit temperature) for controlling the internal temperature of the refrigerated container loading section; and (B3) collecting at least two sensor tags attached to the inside of the loading section (B4) comparing the maximum, minimum temperature, and the selected lower and upper temperatures of the cargo loading unit with the determined optimum setting temperature of the refrigeration unit And judging whether or not it is changed.

Preferably, the step (B3) aligns the collected inside temperature of the cargo carrying unit using at least two sensor tags attached to the inside of the cargo carrying unit, so that the temperature inside the cargo carrying unit, the maximum temperature inside the cargo carrying unit, Is confirmed.

을 이용하여 A를 구하고, A가 상한온도(Upper limit)보다 낮을 경우 A를 적정 설정온도(Set temp.)로 설정하고, 높을 경우 상한온도(Upper limit)를 적정 설정온도(Set temp.)로 설정하는 단계와, 상기 수집된 최고온도(Max temp.)가 상한온도(Upper limit) 이상인 경우, 수식

을 이용하여 B를 구하고, B가 하한온도(Lower limit)보다 높을 경우 B를 적정 설정온도(Set temp.)로 설정하고, 낮을 경우 하한온도(Lower limit)를 적정 설정온도(Set temp.)로 설정하는 단계와, 상기 수집된 최저온도(Min temp.)가 하한온도(Lower limit) 미만이고 최고온도(Max temp.)가 상한온도(Upper limit) 이하인 경우, 수식

을 이용하여 C를 구하고, C가 상한온도(Upper limit)보다 낮을 경우 C를 적정 설정온도(Set temp.)로 설정하고, 높을 경우 상한온도(Upper limit)를 적정 설정온도(Set temp.)로 설정하는 단계와, 상기 수집된 최저온도(Min temp.)가 하한온도(Lower limit) 이상이고, 최고온도(Max temp.)가 상한온도(Upper limit) 초과인 경우, 수식

를 이용하여 D를 구하고, D가 하한온도(Lower limit)보다 높을 경우 D를 적정 설정온도(Set temp.)로 설정하고, 낮을 경우 하한온도(Lower limit)를 적정 설정온도(Set temp.)로 설정하는 단계와, 상기 수집된 최고온도(Max temp.)와 최저온도(Min temp.)가 상한온도(Upper limit)와 하한온도(Lower limit) 이내인 경우, 기준온도를 적정 설정온도(Set temp.)로 설정하는 단계를 포함하여 이루어지는 것을 특징으로 한다.Preferably, the step (B4) includes the steps of collecting the lowest temperature and the highest temperature by sorting the temperature values of the collected sensor tags, and if the collected maximum temperature (Max temp.) Is lower than the lower limit,

A is set to a set temp. When A is lower than the upper limit, A is set to a set temp. When A is higher than the upper limit, A is set to a set temp. And if the collected maximum temperature (Max temp.) Is equal to or greater than the upper limit temperature,

B is set to the set temp. When B is higher than the lower limit, B is set to the set temp. When the temperature is lower than the lower limit, B is set to the set temp. And when the collected minimum temperature (Min temp.) Is less than the lower limit and the maximum temperature (Max temp.) Is less than the upper temperature limit,

C is set to a set temp. When C is lower than the upper limit, C is set to a set temp. When the temperature is higher than the upper limit, C is set to a set temp. And if the collected minimum temperature is equal to or greater than the lower limit and the maximum temperature is greater than the upper limit,

D is set to a set temp. When D is higher than the lower limit, D is set to a set temp. When the temperature is lower than the lower limit, D is set to a set temp. And when the collected maximum temperature and the minimum temperature are within an upper limit and a lower limit, the reference temperature is set to an appropriate set temperature (Set temp .). ≪ / RTI >

As described above, the apparatus and method for maintaining optimum storage temperature of fresh cargo using the refrigerator container according to the present invention can automatically adjust the temperature of the refrigerator container proper temperature during the fresh cargo transportation using the refrigerator container, It is possible to change the internal temperature of the cargo hold in time similar to the optimal storage temperature of the fresh cargo, and to maintain the optimum storage temperature of the fresh cargo, thereby preventing the deterioration of the quality of the fresh cargo.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an optimum storage temperature storage apparatus for fresh cargo using a refrigeration container according to an embodiment of the present invention; FIG.
2 is a flow chart for explaining a method for maintaining an optimum storage temperature of a fresh cargo using a refrigeration container according to an embodiment of the present invention.
FIG. 3 is a flow chart for explaining a process of calculating and setting a suitable refrigerator container set temperature in FIG.

Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of an apparatus and method for maintaining optimum storage temperature of fresh cargo using a refrigeration container according to the present invention will now be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to let you know. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of an apparatus for maintaining optimum storage temperature of fresh cargo using a refrigeration container according to an embodiment of the present invention; FIG.

1, a container main body 10 constituting a cargo loading section 100 capable of loading cargo, a main body 10 installed in a closed space on one side of the container main body 100, A refrigeration unit 200 for supplying air (cold or warm) supplied from the refrigeration unit 210 to the cargo loading unit 100 of the container main body; and at least two cargo loading units 100 attached to the cargo loading unit 100 100 and the actual temperature value measured by the temperature sensor is output through wireless communication; and a temperature sensor for detecting a temperature of the cargo loading unit 100 output from the sensor tag 110, A control unit 300 for calculating a container proper set temperature and generating a control signal for adjusting the flow direction of air entering the cargo loading unit 100 in the refrigeration unit 200 to maintain the calculated proper set temperature, In the control unit 300, The air circulation path 400 connected to the inside of the cargo loading unit 100 is opened or closed by opening / closing the path of the air (warm or cool) generated in the freezing module 210 of the freezing unit 200 based on the generated control signal (Or closing) at least one of the driving switch portions 120a and 120b.

The sensor tag 110 is attached to the refrigerator container loading unit 100 and collects temperature and humidity around the cargo according to a predetermined cycle to collect the refrigerator container condition information installed in the refrigeration unit 200. The control unit is connected to the Wi- Fi, 433MHz RF, 2.5GHz RF, and Bluetooth. At this time, it is possible to collect temperature and humidity information from up to 16 sensor tags using controller by using time sharing method. In addition, the sensor tag 110 can check the log recorded in the USB interface, and can be reused through battery charging.

The control unit 300 sets the set temperature of the freezing container through the freezing container temperature control algorithm on the basis of the actual temperature value in the cargo loading unit 100 transmitted from the sensor tag 110 so that the cargo loading unit 100 To control the temperature of the air supplied to the cargo loading section 100 to maintain the optimum storage temperature of the cargo. At this time, the first set temperature to be set first is the temperature remotely controlled by the manager from the real-time status information monitoring server (not shown), and the appropriate set temperature is calculated by the controller 300 to automatically adjust the internal temperature according to the internal state of the freezing container Lt; / RTI > Accordingly, the control unit 300 automatically calculates the internal temperature by calculating the optimal set temperature of the freezing container using the initial set temperature and the temperature information collected from the sensor tag 110 through the freezing container temperature control algorithm.

The real-time status information monitoring server includes a middleware for receiving information transmitted from the control device and a database for storing information, a web for providing freezing container shipping information to users, Program. Middleware collects information about freezing container status o Receives freezing container information from control device, transmits ACK (Acknowledgment) that information is normally received, and remote setting of refrigerating container in transit is possible.

The freezing unit 200 includes a freezing container freezing module 210 configured by a cooler, a heater, and a circulating motor that can be independently operated according to the internal state of the cargo loading unit 100, The first and second temperature sensor units 220a and 220b for sensing the temperature of the air flowing into the cargo loading unit 100 and the temperature of air circulating through the cargo loading unit 100 and returning to the freezing unit 200 .

The air circulation passage 400 serves as a passage through which the air of the freezing unit 200 flows into the cargo loading unit 100. The air circulation passage 400 is formed in the lower portion of the freezing container 400. The air circulation passage 400 is composed of a passage portion 400a having a T-shaped vertical cross-section as shown in FIG. 1, Thereby preventing the air from spreading at one time and moving it far.

The operation of the fresh-cargo optimum storage temperature maintenance apparatus using the refrigeration container according to the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals as those in Fig. 1 designate the same members performing the same function.

2 is a flowchart illustrating a method for maintaining an optimum storage temperature of fresh cargo using a refrigeration container according to an embodiment of the present invention.

Referring to FIG. 2, first, the actual temperature data in the cargo loading box 100 is collected using a plurality of sensor tags 110 attached to the inside of the refrigeration container cargo loading box 100 and transmitted to the controller 300 through wireless communication. And transmits the collected indoor temperature data of the cargo loading box 100 (S100).

In operation S200, the control unit 300 calculates an appropriate set temperature of the freezing container using the delivered actual temperature data in the cargo loading box 100.

The control unit 300 generates a control signal for controlling the flow of air flowing into the cargo loading unit 100 from the refrigeration unit 200 to maintain the calculated appropriate set temperature (S300).

(Warm or cool) generated in the refrigeration module 210 of the refrigeration unit 200 through the switching of at least one of the driving switch units 120a and 120b based on the control signal thus generated, To the air circulation passage 400 connected to the inside of the air circulation passage 400 (S400).

At this time, in calculating the proper set temperature of the freezing container, the optimal storage temperature, the low temperature failure temperature, and the high temperature failure temperature data of the fresh cargo are preset in order to calculate the optimal set temperature of the freezing container for maintaining the optimal storage temperature of fresh cargo, The appropriate set temperature of the freezing container is calculated through the process shown in FIG.

Referring to FIG. 3, first set temperatures (reference temperature, lower limit and upper temperature) for controlling the internal temperature of the refrigerator container loading unit 100 are selected (S201). That is, when the manager sets the low temperature failure temperature, the high temperature failure temperature, and the proper storage temperature, the low temperature failure temperature and the high temperature failure temperature are selected as the lower limit temperature and the upper limit temperature, respectively, The storage temperature is used as the reference temperature in the freezing container loading section 100.

In step S202, the maximum and minimum temperatures inside the cargo loading box 100 are checked based on the internal temperatures collected using at least two sensor tags 110 installed in the cargo loading unit 100. This is because the internal temperature of the collected cargo loading section 100 is aligned by using at least two sensor tags 110 attached to the inside of the cargo loading section 100 and the inside temperature deviation of the cargo loading section 100 and the inside temperature of the cargo loading section 100 Check the maximum and minimum temperatures.

Then, in step S203, it is determined whether the optimum set temperature of the freezing unit 200 has been changed by comparing the maximum, minimum temperature, and the selected lower and upper limit temperatures within the identified cargo loading unit. The most important thing is to prevent the fresh cargo from being exposed to low-temperature or high-temperature disturbances.

Whether or not the proper set temperature of the freezing unit 200 is changed is determined according to the following five conditions using the refrigeration container temperature control algorithm.

First, the temperature values of the collected sensor tags 110 are sorted to collect the lowest temperature and the highest temperature.

When the collected maximum temperature (Max temp.) Is less than or equal to the lower limit (Condition 1), A is obtained using the following equation (1). If A is lower than the upper limit, A is set to the set temp. If it is higher, the upper limit is set to the set temp.

When the collected maximum temperature (Max temp.) Is equal to or higher than the upper limit temperature (Condition 2), B is obtained using the following equation (2). When B is higher than the lower limit, B is set to the set temp. When the temperature is lower than the lower limit, B is set to the set temp.

When the collected minimum temperature (Temp.) Is less than the lower limit and the maximum temperature (Max temp.) Is less than the upper limit (Condition 3), C I ask. If C is lower than the upper limit, C is set to the set temp., And if it is higher, the upper limit is set to the set temp.

When the collected minimum temperature (Min temp.) Is equal to or greater than the lower limit and the maximum temperature (Max temp.) Exceeds the upper limit (Condition 4), the following equation D is obtained. D is set to the set temp. When D is higher than the lower limit, and the lower limit is set to the set temp.

When the maximum temperature (Max temp.) And the minimum temperature (Min temp.) Are within the upper limit temperature and the lower limit (condition 5), the reference temperature is set to the appropriate set temperature (Set temp. .

In the case of Condition 1 and Condition 3, when the inside temperature of the cargo loading section 100 is lower than the lower limit temperature, it is selected to raise the inside temperature of the cargo loading section 100. In the case of condition 2 and condition 4, And is selected to lower the temperature inside the cargo area when it is higher.

As shown in the following Table 1, when the method of maintaining the optimum storage temperature of the fresh cargo according to the present invention is applied to the actual sea transportation zone transported from Singapore to Singapore, And the temperature deviation of about 0.5 ℃ was less than 3.0 ℃, which is the temperature deviation inside the container loading part. For reference, Table 1 shows that 16 sensor tags attached inside the 20ft refrigerated container cargo area loaded with the melon cargo from Singapore to Kyungbuk Province from June 16, 2017 to June 28, 2017, The results of summarizing about 1,690 temperature values collected. Unit is ℃.

Intermodal Local Maritime Sensor Tag # 1 4.6 5.6 4.3 Sensor Tag # 2 4.3 4.5 4.2 Sensor Tag # 3 4.7 5.9 4.3 Sensor Tag # 4 4.1 4.2 4.0 Sensor Tag # 5 4.3 4.5 4.3 Sensor Tag # 6 5.0 6.6 4.4 Sensor Tag # 7 4.6 5.9 4.2 Sensor Tag # 8 4.1 4.2 4.0 Sensor Tag # 9 5.0 6.9 4.4 Sensor Tag # 10 4.5 4.3 4.3 Sensor Tag # 11 4.7 6.1 4.3 Sensor Tag # 12 4.2 4.4 4.2 Sensor Tag # 13 5.3 7.4 4.5 Sensor Tag # 14 4.3 4.5 4.2 Sensor Tag # 15 5.2 7.5 4.5 Sensor Tag # 16 4.2 4.4 4.2

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (8)

A container body constituting a cargo loading section capable of loading cargo,
A refrigeration unit installed in a space sealed to one side of the container body and supplying air of cold or warm air supplied from the refrigeration module into a cargo loading portion of the container body;
At least two or more sensors attached to the cargo loading part to measure the temperature inside the cargo loading part and to output the measured actual temperature value through wireless communication,
A control unit for calculating a proper set temperature of the freezing container using the actual temperature value in the cargo loading unit output from the sensor tag and controlling the flow direction of the air entering the cargo loading unit in the freezing unit to maintain the calculated proper set temperature, A control unit for generating a signal,
And at least one drive switch unit for opening or closing a path of an air circulation passage connected to the interior of the cargo stacking unit, the warm or cool air generated by the refrigeration module of the refrigeration unit based on the control signal generated by the control unit Respectively,
Wherein the control unit uses a pre-selected reference temperature, a lower limit and an upper limit temperature in a process of calculating a refrigeration container proper set temperature using an actual temperature value in the cargo loading unit output from the sensor tag,
Collecting the lowest temperature and the highest temperature by sorting the temperature values of the collected sensor tags, and if the collected maximum temperature (Max temp.) Is less than the lower limit (Lower limit)

A is set to a set temp. When A is lower than the upper limit, A is set to a set temp. When A is higher than the upper limit, A is set to a set temp. Setting,
When the collected maximum temperature (Max temp.) Is equal to or higher than the upper limit temperature,

B is set to the set temp. When B is higher than the lower limit, B is set to the set temp. When the temperature is lower than the lower limit, B is set to the set temp. Setting,
If the collected minimum temperature (Min temp.) Is below the lower limit and the maximum temperature (Max temp.) Is below the upper limit,

C is set to a set temp. When C is lower than the upper limit, C is set to a set temp. When the temperature is higher than the upper limit, C is set to a set temp. Setting,
When the collected minimum temperature (Min temp.) Is equal to or higher than the lower limit and the maximum temperature (Max temp.) Exceeds the upper limit,

D is set to a set temp. When D is higher than the lower limit, D is set to a set temp. When the temperature is lower than the lower limit, D is set to a set temp. Setting,
If the collected maximum temperature (Max temp.) And the minimum temperature (Min temp.) Are within the upper limit temperature and the lower limit temperature, the reference temperature is set to the appropriate set temperature (Set temp.) And a storage container for storing the fresh cargo. The method according to claim 1,
The control unit sets the proper set temperature of the freezing container through the freezing container temperature control algorithm based on the actual temperature value in the cargo loading unit delivered from the sensor tag to adjust the temperature of the air supplied into the cargo loading unit in the freezing unit An optimal storage temperature maintenance device for fresh cargo using a freezing container. The refrigeration system according to claim 1, wherein the freezing unit
A refrigeration container refrigeration module composed of a cooler, a heater and a circulating motor that can be independently operated according to the internal state of the cargo loading section,
And a first and second temperature sensor units installed in the freezing unit for sensing the temperature of the air flowing into the cargo loading unit and the temperature of the air returning to the freezing unit by circulating the cargo loading unit. Optimum storage temperature maintenance device using fresh cargo. The method of claim 3,
And the air circulation passage constitutes an air circulation passage serving as a passage through which the air of the freezing unit flows into the inside of the cargo loading section, and the air circulation passage is formed in the lower part of the freezing container and has a vertical cross- Optimal storage temperature maintenance of fresh cargo using freezing container. (A) collecting the actual temperature data in the cargo loading box using a plurality of sensor tags attached to the inside of the freezing container cargo loading box and transmitting the collected indoor temperature data to the control unit through wireless communication,
(B) calculating a proper set temperature of the freezing container using the delivered actual temperature data in the cargo hold in the control unit,
(C) generating a control signal for controlling the flow of air flowing into the cargo loading unit in the refrigeration unit to maintain the calculated appropriate set temperature in the control unit, and
(D) circulating warm or cool air generated in the refrigeration module of the refrigeration unit through at least one of the at least one drive switch unit based on the generated control signal to an air circulation passage connected to the inside of the cargo loading unit and,
In order to calculate an appropriate set temperature in the step (B), a predetermined temperature, a lower limit and an upper limit temperature are used, and the temperature values of the collected sensor tags are sorted to collect the lowest temperature and the highest temperature,
When the collected maximum temperature (Max temp.) Is lower than the lower limit (Lower limit)

A is set to a set temp. When A is lower than the upper limit, A is set to a set temp. When A is higher than the upper limit, A is set to a set temp. Setting,
When the collected maximum temperature (Max temp.) Is equal to or higher than the upper limit temperature,

B is set to the set temp. When B is higher than the lower limit, B is set to the set temp. When the temperature is lower than the lower limit, B is set to the set temp. Setting,
If the collected minimum temperature (Min temp.) Is below the lower limit and the maximum temperature (Max temp.) Is below the upper limit,

C is set to a set temp. When C is lower than the upper limit, C is set to a set temp. When the temperature is higher than the upper limit, C is set to a set temp. Setting,
When the collected minimum temperature (Min temp.) Is equal to or higher than the lower limit and the maximum temperature (Max temp.) Exceeds the upper limit,

D is set to a set temp. When D is higher than the lower limit, D is set to a set temp. When the temperature is lower than the lower limit, D is set to a set temp. Setting,
If the collected maximum temperature (Max temp.) And the minimum temperature (Min temp.) Are within the upper limit temperature and the lower limit temperature, the reference temperature is set to the appropriate set temperature (Set temp.) The method of claim 1, further comprising: 6. The method of claim 5, wherein step (B)
(B1) a step of preliminarily setting the optimal storage temperature, low temperature failure temperature and high temperature failure temperature data of the fresh cargo in order to calculate the optimum set temperature of the refrigerator container for maintaining the optimal storage temperature of fresh cargo,
(B2) selecting a reference temperature, a lower limit and an upper limit temperature for controlling the inside temperature of the freezing container loading section,
(B3) confirming the maximum and minimum temperatures inside the cargo loading box based on the internal temperature collected using at least two sensor tags attached to the inside of the cargo loading section,
(B4) comparing the maximum, minimum temperature, and the selected lower and upper limit temperatures in the identified cargo loading section to determine whether the refrigeration unit proper set temperature has been changed. How to maintain optimum storage temperature. The method according to claim 6,
The step (B3) aligns the collected inside temperature of the cargo carrying unit using at least two sensor tags attached to the inside of the cargo carrying unit to determine a temperature variation inside the cargo carrying unit and a maximum temperature and a minimum temperature inside the cargo carrying unit Wherein the fresh cargo is stored in the freezing container. delete

Images