Railway wagon wireless warning method and warning system based on ZigBee

A railway freight car and alarm system technology, applied in railway signaling and security, etc., can solve problems such as inconvenient monitoring methods and changes in the number of carriages, and achieve the effects of being beneficial to system costs, control system costs, and anti-theft real-time effects.

Inactive Publication Date: 2012-01-18

LIAONING UNIVERSITY OF TECHNOLOGY

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AI-Extracted Technical Summary

Problems solved by technology

However, due to the mobility of railway wagons, there will be increases or decreases in goods, increases or decreases in car...

Abstract

The invention discloses a railway wagon wireless warning method based on ZigBee. Carriage ZigBee equipment nodes are arranged above each wagon carriage door, a wireless sensor network is built, a ratio frequency card is adopted for writing the media access control (MAC) address of the ZigBee equipment nodes arranged on each carriage into the radio frequency card, the carriage number and the MAC address of the ZigBee equipment nodes can be statically bound, in addition, the carriage number can be correctly displayed on a hand-held terminal, a door magnetic sensing circuit is arranged on each carriage door for collecting the door state switch quantity signal, the ZigBee equipment nodes corresponding to the opened carriage door generate warning information when the carriage door is illegallyopened, the warning information is uploaded to a ZigBee coordinator through a wireless network, and the warning information is displayed on the hand-held terminal interface. The method is suitable for conditions with freely increased and decreased carriages, the operation by nonprofessional personnel is convenient, the carriage number is convenient to modify, safety and reliability are realized, the invasion of illegal personnel into the wagon carriage can be timely discovered, in addition, railway workers are prompted to adopt measures for processing through the warning, the labor and the materials can be greatly saved, the efficiency for fighting against the crime of stealing can be improved.

Application Domain

Railway signalling and safety

Technology Topic

TruckEmbedded system +9

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Examples

Experimental program(1)

Example Embodiment

[0033] As shown in the figure, the ZigBee-based wireless alarm system for railway freight cars is composed of the following units: There are multiple ZigBee device nodes 2 installed above the doors of each freight car, and ZigBee installed on each car that transports goods out of the station. The radio frequency card 4 written into the MAC address of the device node 2 statically binds the car number with the MAC address of the ZigBee device node 2 and is used to correctly display the car number and the handheld terminal 5 for displaying alarm information. Install it on the handheld terminal 5 for use To upload the alarm information of the corresponding ZigBee device node 2 to the ZigBee coordinator 3 through the wireless network, and install it on each car door to monitor the status of the truck car door in real time so that the ZigBee device node 2 corresponding to the opened car door According to actual needs, the door magnetic sensor circuit 1 that generates alarm information can also be equipped with a remote monitoring PC 7 connected to the handheld terminal through the GPRS network 6.

[0034] The ZigBee device node 2 is composed of a wireless microprocessor 201 (using JN5139) as the main control chip, a peripheral extended radio frequency transmitting circuit 207, a crystal oscillator circuit 203, a reset circuit 202, and a battery power supply circuit connected to the wireless microprocessor 201 204, GPIO export 205 and programming download circuit 206.

[0035] The ZigBee coordinator 3 is integrated with the handheld terminal 5 as a battery-powered module component, and mainly processes the alarm data sent by each ZigBee device node 2. The ZigBee coordinator 3 is the main controller in the ZigBee network, a ZigBee The network is equipped with a ZigBee coordinator, responsible for the establishment and data upload of the ZigBee network. After obtaining the alarm data sent by each field node, the ZigBee coordinator 3 communicates with the handheld terminal 5 through the serial port. The ZigBee device node 2 mainly joins the wireless network, monitors the alarm signal in real time, performs data routing relay and uploads the alarm information to the ZigBee coordinator 3.

[0036] The handheld terminal 5 is composed of a processor 501 (Inter Xscale), an IC card radio frequency module 502, a crystal oscillator circuit 503, an LCD display module 504, a peripheral expansion memory 505 and an SDRAM 506.

[0037] The door magnetic sensor circuit 1 can use an infrared heat sensor to detect the movement of a person, or use a reed switch to detect the open state of the door, or use Hall components to detect the open state of the door. Considering the stability, sensitivity and cost of the sensing circuit and other factors, the door magnetic sensing circuit composed of a reed switch and a magnet is used in this embodiment. Once the magnet and the reed switch are separated to a certain distance (that is, when the car door is opened), the reed switch bounces and sends a high-level signal to the wireless microprocessor 201 in the ZigBee device node 2, and then enters an interruption to generate an alarm.

[0038] The ZigBee-based wireless alarm method for railway wagons, the specific process is as follows:

[0039] 1. Each ZigBee device node 2 automatically builds a wireless sensor network, and uses the radio frequency card 4 to write the MAC address of the ZigBee device node 2 installed on each carriage that is about to transport goods out of the station to the radio frequency card 4;

[0040] 2. Perform static binding of the car number with the MAC address of the ZigBee device node 2 to correctly display the car number on the handheld terminal 5;

[0041] 3. Use the door magnetic sensor circuit 1 to collect the door status switch signal to monitor the status of the truck compartment door in real time;

[0042] 4. When the car door is opened illegally, the wireless microprocessor 201 is sent to the wireless microprocessor 201 through the door sensor circuit 1 to make the ZigBee device node 2 corresponding to the opened car door generate alarm information, and the alarm information of the ZigBee device node 2 passes The peripheral expansion radio frequency transmitting circuit 207 wirelessly transmits to the ZigBee coordinator 3 at the handheld terminal 5. The ZigBee coordinator 3 communicates with the handheld terminal 5 through the serial port, and displays alarm information on the interface of the handheld terminal 5 to remind the escorts to take safety protection measures .

[0043] The system software consists of ZigBee coordinator software, Zigbee device node software and handheld terminal software.

[0044] Such as Figure 4 As shown, the program flow of ZigBee Coordinator 3 is as follows:

[0045] The ZigBee coordinator 3 is mainly used to establish a wireless ZigBee network. When the ZigBee coordinator 3 is powered on, first configure the network parameters, including the network channel number, PAN ID (personal area network ID), etc., and establish the sensor network according to the configured network parameters. After the network is successfully built, execute the protocol stack scheduling module and judge Whether there is a data event, if so, start running to process network events (such as waiting for other nodes to join the network), data events (processing data sent by other nodes), hardware interrupt events (processing hardware interrupts), etc.; if not continue to judge .

[0046] Such as Figure 5 As shown, the program flow of ZigBee device node 2 is as follows:

[0047] ZigBee device node 2 mainly completes the detection of the safety status of the carriage, power supply detection, and data transfer. After the ZigBee device node 2 is powered on, first configure the network parameters to realize the routing function, and the maximum number of nodes is 100; then search for available networks, request to join the network, set the PANID of the network, and allow child nodes to join, etc. Then execute the protocol stack scheduling module to determine whether there is an interrupt event. When the door sensor circuit 1 collects the open state of the car door, an interrupt is triggered, the hardware interrupt event is processed, and then the protocol stack scheduling module is executed to send the alarm information to the ZigBee coordinator 3 through wireless transmission; if there is no interrupt event, continue to execute the protocol stack scheduling Module.

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Load switching experimental system based on power line carrier AD hoc network and operation method of load switching experimental system

ActiveCN110223577AFlexible networkingImprove scalability

Owner:NANJING AGRICULTURAL UNIVERSITY

Classification and recommendation of technical efficacy words

Flexible networking
easy maintenance

Railway wagon wireless warning method and warning system based on ZigBee

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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