JPH09126902A - Method for measuring and recording temperature in refrigerator of refrigerating vehicle mounting operation control meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to measure the temperature in a refrigerator at will without the effects of external noises by transmitting the output of the temperature sensor in the refrigerator to an operation control meter by a radio. SOLUTION: The temperature in a refrigerator is measured by a temperature sensor 6 of a temperature sensor part 7, and the measured data are converted by an A/D converter circuit 9 of a radio transmitting part 8. The output of the A/D converter circuit 9 is fetched into a CPU 10 and transmitted as the radiowave through a high-frequency transmitting part 11 and a transmitting antenna 13. The radiowave is received into a radio receiver part 14 of an operation control meter 5. That is to say, the radiowave received by a receiving antenna 15 is sequentially fetched into a CPU 17 through a high-frequency receiving part 16 and accepted to a CPU 20 of a main body 18 of the operation control meter through an I/O 19. The temperature data inputted to the CPU 20 undergoes signal processing adequately. The temperature is displayed on a display part 21 or recorded in the memory region of a recording medium 23 through an I/O 22 together with the time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating vehicle or a refrigerating vehicle (hereinafter, both are collectively referred to as a refrigerating vehicle) for carrying cargo such as food and medical products such as fresh seafood and meat, and particularly to operation. The present invention relates to a temperature measuring method and a temperature recording method in a cold storage (freezer or refrigerator) of a cold storage vehicle equipped with a management meter.

[0002]

2. Description of the Related Art Recently, vehicles such as trucks, buses, and taxis are equipped with an operation control meter for recording the operation state thereof with time. As this operation management meter, for example, there is one disclosed in Japanese Patent Publication No. 3-30920 which is related to the applicant of this application. Further, even in cold storage vehicles for transporting food and medical products such as fresh seafood and meat, many vehicles equipped with an operation control meter are becoming popular.

By the way, in, for example, a refrigerating vehicle equipped with the above operation control meter, the temperature in the freezer is measured,
In order to send the measurement data to the operation management meter provided on the driver's seat side, as shown in FIG. 5, a plurality of temperature sensors 52 are provided at appropriate places in the freezer 51, and output signals from the temperature sensors 52 are provided. Is sent to the signal processing circuit 53 provided on the driver's seat side via the signal cable 54, and the appropriately processed signal is sent to the operation management unit 55 via the signal cable 56.

In the operation controller 55, the measured temperature data is recorded on a recording medium such as a memory card. In that case, in the conventional case, the recording cycle was fixed (for example, 1 minute). .

[0005]

However, in the method of transmitting the output of the temperature sensor 52 to the signal processing circuit 53 via the signal cable 54 as shown in FIG. When measuring temperature,
It is necessary to change the length of the signal cable 54 according to the installation position of the temperature sensor 52, or to use a sufficiently long signal cable 54. However, when the cable length is changed, the impedance up to the signal processing circuit 53 changes, and it is necessary to appropriately adjust the constant in the signal processing circuit 53 according to the length. If the signal cable 54 is too long, external noise is liable to be introduced and malfunction may occur. Further, when the temperature sensor 52 is installed in various places, there is a disadvantage that the signal cable 54 needs to be routed correspondingly.

Further, as described above, the recording method of recording the temperature data at a constant recording cycle always has the following disadvantages. That is, if the recording cycle is set short,
Even if the temperature of the freezer 51 is suddenly changed such as when the door is opened, the temperature data can be recorded correspondingly, but when the temperature hardly changes,
Just by consuming the recording space of the recording medium,
Recording efficiency is poor. Conversely, if you set a large recording cycle,
It is not possible to cope with the abrupt temperature change as described above, and it is impossible to perform recording in accordance with the actual temperature change.

The present invention has been made in view of the above matters. A first object of the present invention is to arbitrarily measure the temperature in the cool box without restriction on the measurement site and the influence of external noise. It is to provide a method for measuring the temperature inside the cold storage of a cold storage vehicle (hereinafter simply referred to as a temperature measurement method) equipped with an operation control meter that can accurately measure without receiving
A second object is to provide a method for recording the temperature inside the cold storage of a cold storage vehicle (hereinafter referred to as a temperature recording method) equipped with an operation control meter capable of efficiently recording the temperature data obtained by measurement. is there.

[0008]

In order to achieve the above-mentioned first object, in the first aspect of the invention, the operation management is configured to record various data necessary for vehicle operation management in a storage medium with time. In a cold storage vehicle equipped with a meter, a temperature sensor for measuring the internal temperature of the cold storage or the temperature of the cargo stored in the cold storage is provided, and the output of this temperature sensor is transmitted to the operation management meter wirelessly. (Claim 1).

In this case, the temperature sensor and the wireless transmitter may be integrally formed, while the operation control meter and the wireless receiver may be integrally formed (claim 2).

Further, a humidity sensor may be provided in the cool box and the output of the humidity sensor may be transmitted to the operation management device by radio (claim 3).

In order to achieve the above second object,
According to the second aspect of the invention, in a cold storage vehicle equipped with an operation control meter configured to record various data necessary for vehicle operation management in a storage medium with time, the rate of change in temperature in the cold storage can be reduced. Accordingly, the cycle of recording on the storage medium is changed (claim 4).

According to the first aspect of the present invention, since the cable wiring in the cool box is eliminated, the problems associated with the cable wiring can be solved, and the temperature in the cool box can be measured arbitrarily without restricting the measurement site and the like. Can measure with high accuracy.

When the humidity inside the cool box is measured and the humidity is transmitted wirelessly to the operation management meter, the state inside the cool box can be grasped more accurately.

According to the second aspect of the present invention, the memory area can be effectively used by increasing the recording cycle when the temperature change is small and shortening the recording cycle when the temperature change is large, thereby improving the recording efficiency. Can be improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings.

First, the first invention will be described. 1 and 2 show one embodiment of the first invention,
In FIG. 1, reference numeral 1 denotes a refrigerating vehicle (an example of a refrigerating vehicle) having a freezer 2 at a rear portion thereof, and foods such as fish or meat (hereinafter, referred to as cargo) 3 to be frozen are appropriately loaded inside the freezer 2. ing. On the other hand, in the vicinity of the driver's seat 4 of the refrigeration vehicle 1, an operation management device 5 (details of this configuration will be described later in detail) is provided.

A major characteristic configuration of the first invention is that a temperature sensor 6 for measuring the temperature inside the freezer 2 is provided in the freezer 2.
The output of the temperature sensor 6 is wirelessly transmitted to the operation management device 5. Therefore, details of this configuration will be described with reference to FIG.

In FIG. 2, reference numeral 7 is a temperature sensor unit with a wireless transmission unit (hereinafter referred to as a temperature sensor unit) in which the temperature sensor 6 and the wireless transmission unit 8 are integrally incorporated.
Is provided with, for example, a 4-channel A / D conversion circuit 9 for A / D converting the output of the temperature sensor 6, a CPU 10, a high frequency transmission unit 11 and a power supply unit 12, and a transmission antenna 13, and the temperature sensor The temperature data measured by 6 is transmitted to the operation management device 5.

On the driver's seat 5 side, there is provided an operation management device 5 in which a wireless receiver 14 corresponding to the wireless transmitter 8 is integrally incorporated. That is, this receiving unit 14
For example, the receiving antenna 15, the high frequency receiving unit 16, the CPU 1
7 etc. In addition, I /
A recording medium 2 such as a memory card is provided with an O19, a CPU 20, a display unit 21, an I / O 22 and the like.
2 is configured to be detachably attachable. In other words, in this embodiment,
It has a receiving function. Although not shown, it goes without saying that the operation management device 5 is provided with a power supply unit for operating each member.

In the refrigerating vehicle 1 having the above structure, the temperature inside the freezer 2 is measured by the temperature sensor 6 of the temperature sensor unit 7, and the measured data is A / D converted by the A / D conversion circuit 9 of the wireless transmission unit 8. To be done. This A / D conversion circuit 9
Output of the high frequency transmitter 11 is captured by the CPU 10.
And it is transmitted by radio waves via the transmitting antenna 13.

The radio wave is received by the radio receiver 14 provided in the operation management device 5. That is, the receiving antenna 1
The radio wave received at 5 is passed through the high frequency receiving unit 16 to the CPU.
It is sequentially taken in by 17, and taken in by the CPU 19 of the operation management main body 18 via the I / O 19. Various signals such as a speed signal from a speed sensor provided in the refrigeration vehicle 1 and an input signal input by a driver are input to the CPU 19, and the CPU 19 appropriately processes these signals. The temperature data input to the CPU 19 via O18 is also subjected to appropriate signal processing, and the temperature is displayed on the display unit 21 or recorded with time in the memory area of the recording medium 23 via the I / O 22.

As described above, in the first invention,
Unlike the conventional method, there is no need to route the signal cable, so there is no need to make adjustments due to differences in cable length. Eliminates cable handling. Accurate measurement can be performed without being affected by external noise. Further, the temperature sensor 6 can be directly applied to the surface of the cargo 3. As a result, the temperature at any place inside the freezer 2 can be accurately measured.

While the temperature sensor 6 and the wireless transmitter 8 are integrally formed, the operation management main body 18 and the wireless receiver 1 are integrated.
Since 4 is integrally configured, it is compact and easy to handle.

The first aspect of the present invention is not limited to the above-described embodiment, and for example, a plurality of temperature sensor sections 7 may be provided. In that case, the inside of the freezer 2 is divided into appropriate areas, Measure the temperature of each area and
The temperature of can be measured.

Then, at the transmitter side, the temperature sensor 6
Alternatively, the wireless transmission unit 8 and the wireless transmission unit 8 may be separated from each other, and both 6 and 8 may be connected by a short cable. Further, on the receiving side, the wireless receiving section 14 and the operation control meter main body 18 are separately configured, and both 14 and 18 are connected by a short cable, and temperature data is transmitted to the operation control meter main body 18 by a method such as serial communication. You may send it. Further, the recording medium 23 may be a memory inside the operation management device 5.

Further, the present invention can be applied not only to the refrigerating vehicle 1 but also to the refrigerating vehicle. In that case, as shown in FIG. 1, the humidity sensor 24 is integrated in the refrigerator. The built-in humidity sensor unit 25 may be provided, and humidity data may be wirelessly transmitted to the operation management device 5 in the same manner as the above temperature. In addition, 2
6 is a transmitting antenna.

Next, the second invention will be described. 3 and 4 show an embodiment of the second invention,
In FIG. 3, reference numeral 31 denotes an operation control meter, which receives temperature data from a temperature sensor 33 provided in the freezer 2 in addition to an arithmetic circuit 32 to which a speed signal from the speed sensor and an engine key ON / OFF signal are input. An A / D conversion circuit 34, a change rate comparison circuit 35, a data recording circuit 36 for recording various data over time, a recording medium 37, and the like are provided. In this embodiment, as in the first invention, the temperature sensor 33 and the operation management meter 31 may be wirelessly communicable, but the both 33, 31 are connected by the cable 38. Has been done.

The operation of the second invention will be described with reference to FIG. FIG. 4 shows the actual temperature change I in the freezer 2 measured by the temperature sensor 33, the temperature change rate II, and the sampling timing III in the upper, middle, and lower stages, respectively.

The temperature data from the temperature sensor 33 is input to the operation control meter 31 via the communication cable 38.
This input temperature data is A / D converted in the A / D conversion circuit 34, and the temperature change rate thereof is input to the change rate comparison circuit 35. Then, the data recording circuit 36 records the temperature data on the recording medium 37 based on the recording cycle determined in the change rate comparison circuit 35.

That is, the sampling of the temperature data is
As shown in the lower part of FIG. 4, the data is recorded at a constant time interval Δt. In the circuit 36, temperature data is recorded at the time intervals Δt. Then, the sections A, B, C
In other sections, the temperature change rate is small, so sampling is performed at Δt, but data recording is performed at a time interval larger than the time interval Δt.

As described above, in the second invention,
Unlike the conventional case, the period of recording in the storage medium 37 is changed according to the magnitude of the rate of change of the temperature in the freezer 2. That is, since the recording interval is increased when the temperature change is small and the recording interval is decreased when the temperature change is large (severe), the memory area in the recording medium 37 may be consumed unnecessarily. Instead, the temperature change in the freezer 2 can be efficiently recorded, and the temperature can be recorded at low cost.

As shown in FIG. 3, the data recording circuit 36 also records the calculation result of the calculation circuit 32 over time. By efficiently recording the temperature data as described above, Various data can be efficiently recorded in the operation management device 31.

The second invention is not limited to the above-described embodiment, and an alarm may be output when the temperature change is significantly large, for example. The temperature change rate is likely to change greatly when the door of the freezer 2 is opened or closed or when the amount of the cargo 3 changes greatly. However, by grasping these phenomena, the recording cycle is changed before the temperature change rate increases. You may do it.

Further, it goes without saying that the second invention can be similarly applied to the refrigerating vehicle.

[0035]

As described above, according to the first aspect of the present invention, the temperature inside the cool box can be measured arbitrarily and accurately without being restricted by the measurement site and the like. Temperature control becomes possible. Then, in the refrigerating vehicle, the condition inside the refrigerator can be more accurately grasped by measuring the humidity as well.

According to the second aspect of the invention, the memory area can be effectively used, the recording efficiency can be improved, and various data can be efficiently recorded inside the operation control meter. .

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a configuration of a refrigeration vehicle equipped with an operation control meter according to an embodiment of the first invention.

FIG. 2 is a block diagram for explaining temperature measurement in the operation control meter.

FIG. 3 is a diagram schematically showing a configuration in the vicinity of an operation management meter in one embodiment of the second invention.

FIG. 4 is an operation explanatory diagram of the second invention.

FIG. 5 is a diagram for explaining a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Frozen vehicle, 2 ... Freezer, 3 ... Cargo, 5, 31 ... Operation management meter, 6, 33 ... Temperature sensor, 8 ... Wireless transmitter, 14
... wireless receiver, 18 ... operation controller main body, 23, 37 ... storage medium, 24 ... humidity sensor.

Claims (4)

[Claims] 1. A cold storage vehicle equipped with an operation control meter configured to record various data required for vehicle operation management in a storage medium with time, and is stored in a cold storage at its internal temperature or inside. A temperature sensor for measuring the temperature of the cargo is installed, and the output of this temperature sensor is transmitted to the operation control meter wirelessly.Measurement of the temperature inside the cold storage of the cold storage vehicle equipped with the operation control meter Method. 2. A refrigerated vehicle equipped with the operation control meter according to claim 1, wherein the temperature sensor and the wireless transmission section are integrally formed, while the operation control main body and the wireless reception section are integrally formed. How to measure the temperature inside the cool box. 3. A cold storage of a cold storage vehicle equipped with the operation control meter according to claim 1, wherein a humidity sensor is provided in the cold storage and the output of the humidity sensor is wirelessly transmitted to the operation control meter. How to measure the internal temperature. 4. A cold storage vehicle equipped with an operation control meter configured to record various data required for vehicle operation management in a storage medium with time, according to the rate of change in temperature in the cold storage. A method for recording the temperature inside the cold storage of a cold storage vehicle equipped with an operation control meter, characterized in that the cycle of recording in the storage medium is changed.