A new energy refrigeration truck cold compartment temperature monitoring device

Abstract

The utility model discloses a new energy refrigeration truck's cold compartment temperature monitoring equipment in the field of temperature automatic detection, including the temperature sensor probe group for detecting the temperature in the refrigeration box, AD sampling conversion module for converting the analog quantity of temperature sensor probe group output into digital quantity, MCU singlechip module for data processing, data storage module for storing temperature data, CAN communication module for communicating with external CAN bus and power module for power supply for each module, temperature sensor probe group and AD sampling conversion module electric connection, AD sampling conversion module and MCU singlechip module electric connection, the temperature monitoring equipment of the present application is more suitable for new energy refrigeration truck, can gather the temperature value of temperature sensor probe arrangement in the different position of cold compartment, real -time acquisition, and through the Tbox of whole car self -supporting is transmitted to the operation platform, thereby to reduce operation cost, improve the reliability of system operation.

Description

Technical Field

[0001] This utility model relates to the field of automatic temperature detection, specifically a temperature monitoring device for the refrigerated compartment of a new energy refrigerated truck. Background Technology

[0002] With the continuous growth of demand in my country's cold chain logistics market, the cold chain transportation industry is developing rapidly. New energy refrigerated trucks, due to their low transportation costs and green energy characteristics, have gained widespread recognition in the cold chain distribution market. The cold chain industry has stringent requirements for temperature monitoring of refrigerated trucks. During operation, the temperature inside the refrigerated compartment must be monitored in real time. Especially in high-value or temperature-controlled transportation scenarios, multiple temperature sampling points need to be set up inside the refrigerated compartment for multi-point monitoring. Temperature data is then transmitted to a cloud platform via a wireless 4G network, allowing users to check temperature uniformity through computers, mobile phones, and other terminals to ensure consistent cargo temperature and reduce cargo damage.

[0003] In existing technologies, traditional refrigerated trucks typically monitor temperature using a combination of a temperature sensor and a temperature acquisition box. The temperature sensor connects to the acquisition box, which converts analog electrical signals into digital signals and then uploads them to a cloud platform via its built-in 4G module. However, new energy refrigerated trucks generally come equipped with a Tbox device (with a built-in 4G module). If the traditional solution is still used, it would result in a situation where "each temperature acquisition box and Tbox has a 4G module," which would increase hardware procurement and operating costs (such as 4G data charges). Furthermore, the distributed dual 4G module design would increase system failure points (such as network outages or hardware failures in one module), reducing overall reliability.

[0004] Therefore, those skilled in the art provide a refrigerated compartment temperature monitoring device for new energy refrigerated vehicles to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this utility model is to provide a temperature monitoring device for the refrigerated compartment of a new energy refrigerated truck, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A temperature monitoring device for the refrigerated compartment of a new energy refrigerated truck includes a temperature sensor probe group for detecting the internal temperature of the refrigerated compartment, an AD sampling conversion module for converting the analog quantity output by the temperature sensor probe group into a digital quantity, an MCU microcontroller module for data processing, a data storage module for storing temperature data, a CAN communication module for communicating with an external CAN bus, and a power supply module for powering each module. The temperature sensor probe group is electrically connected to the AD sampling conversion module, the AD sampling conversion module is electrically connected to the MCU microcontroller module, the MCU microcontroller module is electrically connected to the data storage module and the CAN communication module respectively, and the power supply module is electrically connected to the AD sampling conversion module, the MCU microcontroller module, the data storage module and the CAN communication module respectively. The CAN communication module is connected to the CAN bus of the new energy refrigerated vehicle, and the Tbox of the new energy refrigerated vehicle is connected to the CAN bus through its own CAN interface to obtain temperature data.

[0007] As a further improvement of this utility model: the temperature sensor probe group includes temperature sensor probe one, temperature sensor probe two, temperature sensor probe three and temperature sensor probe four. Each temperature probe is arranged in different areas of the refrigerator according to the temperature monitoring requirements of the refrigerator. Temperature sensor probe one, temperature sensor probe two, temperature sensor probe three and temperature sensor probe four are all electrically connected to the AD sampling conversion module to realize synchronous acquisition of multi-point temperature in the refrigerator.

[0008] As a further improvement of this utility model: the input terminal of the power module is connected to the low-voltage power supply of the new energy refrigerated vehicle. The power module can convert the low-voltage power supply of the vehicle into the stable voltage required by the AD sampling conversion module, the MCU microcontroller module, the data storage module, and the CAN communication module. When the voltage of the low-voltage power supply of the vehicle is lower than a preset threshold, the power module automatically shuts off the voltage output, so that the entire temperature monitoring device enters a shutdown state to protect the device hardware.

[0009] As a further improvement of this utility model: after receiving the temperature digital signal transmitted by the AD sampling conversion module, the MCU microcontroller module first stores the temperature data in real time to the data storage module, and then forwards the temperature data to the CAN communication module to ensure that the temperature data is not lost and can be transmitted in a timely manner.

[0010] As a further improvement of this utility model: the CAN communication module sends temperature data to the CAN bus in the form of a message. The Tbox of the new energy refrigerated vehicle obtains the message from the CAN bus through its own CAN interface and parses the temperature data. Then, the parsed temperature data is uploaded to the operation platform through the 4G module built into the Tbox of the new energy refrigerated vehicle, so that users can view it through terminal devices.

[0011] Compared with the prior art, the beneficial effects of this utility model are: (1) Reduce operating costs: There is no need to configure an additional 4G module in the temperature monitoring equipment. The 4G module of the Tbox that comes with the new energy refrigerated vehicle can be directly shared, which reduces the hardware procurement cost of the 4G module and the subsequent 4G traffic operation cost. (2) Improve system reliability: The system structure is simplified, one 4G module and related distributed circuits are reduced, the number of system failure points is reduced, and the risk of temperature monitoring interruption due to module network failure or hardware damage is reduced; (3) Adapt to multi-point monitoring needs: The number of probes in the temperature sensor probe group can be flexibly configured according to the size of the cold compartment and the monitoring needs. The probes can be placed in different areas of the cold compartment to accurately monitor the temperature uniformity inside the cold compartment and meet the transportation needs of high-value, temperature-controlled goods. (4) Ensure data security: The data storage module can store historical temperature data to avoid the loss of temperature records due to temporary power outages, and facilitate subsequent tracking of temperature changes during cargo transportation. Attached Figure Description

[0012] Figure 1 This is a connection structure diagram of the present invention; Figure 2 This is a circuit block diagram of the present invention.

[0013] In the diagram: 1. Cold compartment temperature monitoring equipment; 101. AD sampling conversion module; 102. MCU microcontroller module; 103. Data storage module; 104. CAN communication module; 105. Power supply module; 2. Temperature sensor probe group; 201. Temperature sensor probe one; 202. Temperature sensor probe two; 203. Temperature sensor probe three; 204. Temperature sensor probe four; 3. Tbox of the new energy refrigerated truck. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figures 1-2 In this embodiment of the present invention, a refrigerated compartment temperature monitoring device for a new energy refrigerated truck includes a temperature sensor probe group 2, an AD sampling conversion module 101, an MCU microcontroller module 102, a data storage module 103, a CAN communication module 104, and a power supply module 105. The connection relationship and data transmission process of each module are as follows: 1. Module Composition and Connection Relationship Temperature sensor probe group 2: used to collect the internal temperature of the refrigerator. At least two temperature probes are configured according to the monitoring requirements. The probes are arranged in different areas of the refrigerator, such as the front, middle, rear and bottom. All probes are electrically connected to the AD sampling conversion module 101. AD sampling conversion module 101: used to receive the analog temperature signal output by the temperature sensor probe group 2, and convert the analog signal into a digital signal that can be recognized by the MCU microcontroller module 102, and electrically connected to the MCU microcontroller module 102; MCU microcontroller module 102: As the core of data processing, after receiving the digital signal transmitted by AD sampling conversion module 101, it temporarily stores the temperature data in data storage module 103 on the one hand, and forwards the temperature data to CAN communication module 104 on the other hand, and is electrically connected to data storage module 103 and CAN communication module 104 respectively. Data storage module 103: Used to store temperature data including historical temperature records to avoid data loss due to temporary power outages; electrically connected to MCU microcontroller module 102. CAN communication module 104: As the interface between the device and the CAN bus of the new energy refrigerated vehicle, it sends the temperature data transmitted by the MCU microcontroller module 102 to the CAN bus in the form of messages, and is electrically connected to both the CAN bus and the MCU microcontroller module 102. Power module 105: Takes low-voltage power, such as 12V / 24V, from the new energy refrigerated truck and converts it into a stable voltage required by the AD sampling conversion module 101, MCU microcontroller module 102, data storage module 103, and CAN communication module 104 to power each module; when the low-voltage power supply voltage of the vehicle is too low, it automatically shuts off the voltage output to protect the equipment hardware.

[0016] 2 Data Transmission Process After the system is powered on, each probe in temperature sensor probe group 2 collects the temperature of the corresponding area inside the refrigerated compartment and outputs an analog signal to the AD sampling conversion module 101. The AD sampling conversion module 101 converts the analog signal into a digital signal and transmits it to the MCU microcontroller module 102. After receiving the digital signal, the MCU microcontroller module 102 first stores the temperature data in the data storage module 103, and then forwards the temperature data to the CAN communication module 104. The CAN communication module 104 sends the temperature data in the form of a message to the CAN bus of the new energy refrigerated truck. The Tbox3 of the new energy refrigerated truck obtains the temperature data message from the CAN bus through its own CAN interface, parses the temperature value, and then uploads the temperature value to the operation platform through the 4G module built into the Tbox3 of the new energy refrigerated truck. Users can log in to the operation platform through terminal devices such as computers and mobile phones to view the real-time temperature of each area inside the refrigerated compartment.

[0017] The working principle of this utility model is as follows: 1. Module Selection Temperature sensor probe group 2: Select a temperature sensor probe with a negative temperature coefficient, such as an NTC model with a resistance of 10K at 25 degrees Celsius, a measurement range of -40℃ to 105℃, R25=10kΩ±1%, and configure 4 probes 201-204 according to the size of the cold compartment, which are respectively arranged on the upper front, lower middle, upper rear, and center bottom of the cold compartment. AD sampling conversion module 101: It uses the ADS1115 model 16-bit high-precision AD chip, supports 4 channels of analog input, has a maximum sampling rate of 860SPS, and can accurately convert the analog signal output by the temperature sensor probe group 2. The power supply voltage is 3.3V. The AD sampling conversion module can also be integrated into the MCU microcontroller to achieve the same function.

[0018] MCU microcontroller module 102: Selects STM32F103C8T6 microcontroller, based on ARM Cortex-M3 core, with a main frequency of 72MHz, supports communication interfaces such as I2C and UART, and can communicate with AD sampling conversion module 101, data storage module 103 and CAN communication module 104. The power supply voltage is 3.3V. Data storage module 103: Uses AT24C02 EEPROM chip, with storage capacity of 2KB, supports I2C communication, can store nearly 1000 temperature data records including acquisition timestamps, and can retain data for more than 10 years after power failure, with a power supply voltage of 3.3V; CAN communication module 104: Selects TJA1050 CAN transceiver, conforms to ISO11898-2 standard, supports a maximum communication rate of 1Mbps, is compatible with the CAN bus protocol of new energy refrigerated trucks, and has a power supply voltage of 5V. Power module 105: Employs the LM2596 power chip, with an input voltage of 4.5V~40V adapted to the 12V / 24V low-voltage power supply of new energy refrigerated trucks, and outputs 5V power to power the CAN communication module 104; it also uses the LM1117-3.3V voltage regulator chip, taking power from the 5V provided by the LM2596 and stepping it down to output 3.3V power to power the AD sampling conversion module 101, the MCU microcontroller module 102, and the data storage module 103; it also integrates a voltage detection circuit, such as using a TL431 reference source, to disable the LM2596 power chip when the vehicle's low-voltage power supply voltage is below 9V, thus achieving low-voltage protection.

[0019] 2. Work Process 1. Powering on the equipment: After the new energy refrigerated truck starts, the vehicle's low-voltage power supply, such as 24V, supplies power to the power module 105. The power module 105 converts the vehicle's low-voltage power into stable 3.3V and 5V voltages, which power the AD sampling conversion module 101, MCU microcontroller module 102, data storage module 103, and CAN communication module 104, respectively, and the equipment enters the working state. 2. Temperature acquisition: The four probes 201-204 of the temperature sensor probe group 2 acquire the real-time temperature of the corresponding area inside the cold compartment, and output the analog temperature signal to the AD sampling conversion module 101. 3. Signal Conversion and Processing: After receiving the analog signal, the AD sampling conversion module 101 converts it into a 16-bit digital signal and transmits it to the MCU microcontroller module 102 through the I2C communication interface. After receiving the digital signal, the MCU microcontroller module 102 stores the "temperature value + acquisition time" to the data storage module 103 through the I2C communication interface, and forwards the temperature data to the CAN communication module 104 through the SPI communication interface. 4. Data upload to the operation platform: The CAN communication module 104 encapsulates the temperature data into a message that conforms to the CAN bus protocol of new energy refrigerated vehicles, such as the J1939 protocol, and sends it to the vehicle's CAN bus; the Tbox obtains the message from the CAN bus through its own CAN interface, parses out the temperature values ​​corresponding to the four probes, and then uploads the temperature values ​​to the operation platform in real time through its built-in 4G module. 5. Low-voltage protection: If the low-voltage power supply voltage of the whole vehicle drops below 9V, the voltage detection circuit of the power module 105 will trigger the protection mechanism, cut off the voltage output, and automatically shut down the equipment to avoid damage to the hardware of each module due to low voltage.

[0020] 3. Adaptation and Expansion In this embodiment, the temperature sensor probe group 2 is configured with 4 probes. In actual applications, the number of probes can be flexibly adjusted according to the cold compartment volume and monitoring accuracy requirements, such as 2 or 6. This can be achieved by simply adding an input channel to the AD sampling conversion module 101, such as using an 8-channel AD chip like the ADS1118. At the same time, the function of the MCU microcontroller module 102 can be optimized through software to add a temperature abnormality alarm function. When the temperature collected by a certain temperature probe exceeds the preset range, such as the 2℃~8℃ required for refrigerated goods, the MCU microcontroller module 102 controls the CAN communication module 104 to send an alarm message to the CAN bus. After the Tbox receives the alarm message, it pushes the alarm information to the user terminal, such as a mobile APP, through the 4G module to remind the user to handle it in time, further improving the practicality of the equipment.

[0021] This device provides a temperature monitoring system more suitable for new energy refrigerated trucks. It can collect temperature values ​​in real time from the probes of temperature sensor probe group 2, which are placed in different locations in the refrigerated compartment, and transmit them to the operation platform through the vehicle's built-in Tbox. This reduces operating costs and improves system reliability. It eliminates the need for an additional 4G module in the temperature monitoring device, directly sharing the 4G module of the new energy refrigerated truck's built-in Tbox, reducing the hardware procurement cost of the 4G module and subsequent 4G data operation costs. The system structure is simplified by eliminating one 4G module and related distributed circuits, reducing the number of system failure points and minimizing the risk of temperature monitoring interruptions due to module network failure or hardware damage. The number of probes in temperature sensor probe group 2 can be flexibly configured according to the size of the refrigerated compartment and monitoring needs, and the probes can be placed in different areas of the refrigerated compartment to accurately monitor the temperature uniformity within the compartment, meeting the transportation needs of high-value, temperature-controlled goods. The data storage module 103 can store historical temperature data, preventing the loss of temperature records due to temporary power outages and facilitating subsequent tracking of temperature changes during cargo transportation.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A temperature monitoring device for the refrigerated compartment of a new energy refrigerated truck, characterized in that: It includes a temperature sensor probe group (2) for detecting the internal temperature of the refrigerator, an AD sampling conversion module (101) for converting the analog quantity output by the temperature sensor probe group (2) into a digital quantity, an MCU microcontroller module (102) for data processing, a data storage module (103) for storing temperature data, a CAN communication module (104) for communicating with an external CAN bus, and a power supply module (105) for powering each module. The temperature sensor probe group (2) is electrically connected to the AD sampling conversion module (101), the AD sampling conversion module (101) is electrically connected to the MCU microcontroller module (102), the MCU microcontroller module (102) is electrically connected to the data storage module (103) and the CAN communication module (104) respectively, and the power supply module (105) is electrically connected to the AD sampling conversion module (101), the MCU microcontroller module (102), the data storage module (103), and the CAN communication module (104) respectively. The CAN communication module (104) is connected to the CAN bus of the new energy refrigerated vehicle. The Tbox (3) of the new energy refrigerated vehicle is connected to the CAN bus through its own CAN interface to obtain temperature data.

2. The refrigerated compartment temperature monitoring device for a new energy refrigerated truck according to claim 1, characterized in that: The temperature sensor probe group (2) includes temperature sensor probe one (201), temperature sensor probe two (202), temperature sensor probe three (203) and temperature sensor probe four (204). Each temperature probe is arranged in different areas of the refrigerator according to the temperature monitoring requirements of the refrigerator. Temperature sensor probe one (201), temperature sensor probe two (202), temperature sensor probe three (203) and temperature sensor probe four (204) are all electrically connected to the AD sampling conversion module (101) to realize synchronous acquisition of multi-point temperature in the refrigerator.

3. The refrigerated compartment temperature monitoring device for a new energy refrigerated truck according to claim 1, characterized in that: The input terminal of the power module (105) is connected to the low-voltage power supply of the new energy refrigerated vehicle. The power module (105) can convert the low-voltage power supply of the vehicle into the stable voltage required by the AD sampling conversion module (101), the MCU microcontroller module (102), the data storage module (103), and the CAN communication module (104). When the voltage of the low-voltage power supply of the vehicle is lower than the preset threshold, the power module (105) automatically shuts off the voltage output, so that the entire temperature monitoring device enters the shutdown state to protect the device hardware.

4. The refrigerated compartment temperature monitoring device for a new energy refrigerated truck according to claim 1, characterized in that: After receiving the temperature digital signal transmitted by the AD sampling conversion module (101), the MCU microcontroller module (102) first stores the temperature data in real time to the data storage module (103), and then forwards the temperature data to the CAN communication module (104) to ensure that the temperature data is not lost and can be transmitted in a timely manner.

5. The refrigerated compartment temperature monitoring device for a new energy refrigerated truck according to claim 1, characterized in that: The CAN communication module (104) sends temperature data to the CAN bus in the form of a message. The Tbox (3) of the new energy refrigerated vehicle obtains the message from the CAN bus through its own CAN interface and parses the temperature data. Then, the parsed temperature data is uploaded to the operation platform through the 4G module built into the Tbox (3) of the new energy refrigerated vehicle, so that users can view it through the terminal device.

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