First, system overview
The toll collection system is also called the Electronic Collection System (ETC). It uses vehicle automatic identification technology to complete wireless data communication between the vehicle and the toll station, carries out automatic vehicle identification and exchange of related charging data, and processes the charging data through the computer network to realize a full electronic toll management system that does not stop automatically charging. . The system uses a microwave-dedicated short-range communication between an on-board active electronic tag installed on the windshield of a vehicle or other parts of a car body and a remote reader on the ETC lane of a toll booth to use a computer networking technology to perform background settlement with the bank. To deal with, so as to achieve the purpose of the vehicle through the road and bridge toll stations do not need to stop and can pay the tolls. The toll collection system mainly utilizes the automatic vehicle identification technology, and identifies the passing vehicle number through the signal transmission and receiving device of the roadside lane control system, and automatically deducts the toll from the user's special account.
Second, the system requirements
1) The entire system equipment requires 24 hours of continuous work, and the reliability of the main control equipment is relatively high. The main control equipment generally adopts an industrial control computer. The MTBF is 20,000 hours. Commercial machines are generally not considered.
2) The main control equipment is installed in the high-speed toll station, which is greatly affected by harsh environments such as vibration and dust. The main control equipment must be dustproof, shockproof and moisture-proof.
3) VGA port, PS2 port, COM port, USB port, and LAN port are required to debug the device, set parameters, display results, connect peripherals, upload data, etc. The USB port is preferred to facilitate manual operation. ;
4) The application has a full Chinese interface and is easy to operate. The operating system is generally Windows XP.
5) The main control system to complete the information collection, processing, analysis, transmission and other functions, CPU performance can not be too low, but generally do not require too high, can be applied, the general can be more than 2.4GHZ CPU;
6) Expansion interface: Considering future and old product maintenance considerations, it is generally required that the whole machine provide three PCI interfaces (expanding video acquisition card, serial port card, PCI network card) and two ISA interfaces (data acquisition card or serial port card).
Third, the system description
The system collects radio frequency card information through long-distance and non-contact. After the car is equipped with an electronic tag, it enters the ETC lane and the microwave device in the special lane automatically searches for signals and communicates with the electronic tags in the car to realize rapid vehicle movement. Automatic identification under moving conditions to achieve the goal of automated management. This system product integrates computer hardware and software, wireless communication, information acquisition and processing, data transmission, network communication, automatic control and smart card production technology applications. It is an advanced intelligent traffic information collection device and a high-security intelligent identification system. , is an important technical means that can effectively carry out automatic identification and network supervision of vehicles. With current technological means, only active electronic tags can achieve stable high-speed identification.
In addition to the key charge services, the system has to complete a variety of tasks, such as vehicle location awareness, vehicle picture capture, image character overlay, fee display, automatic rail opening and closing, traffic signal indication, automatic alarm setting, etc. The function has the corresponding function module connected with the master control, such as serial port, USB interface, network port and so on.
Fourth, the system block diagram
The main components of ETC lanes are: RSU, OBU, traffic lights, alarms, character overlays, fee display, automatic barriers, and lane computers (including monitors, keyboards, and mainframes). ), lane controllers, canopy lights, vehicle detectors, ground coils, cameras, card readers, etc.
Explanation: The ETC toll islands are 7 meters longer than the manual toll islands. The main ETC lane equipment is installed on this extended 7-meter island.
V. Product List
Main Control Equipment: EVOC EPE Machine IPC-6805E
The motherboard of the main control device is a high-performance platform with Intel® H61 chipset supporting Intel® LGA1155 packaged dual-core, quad-core I3, I5, I7 and other CPUs; it supports two 800M/1066M/1333M DDR3 memory modules. The total capacity of the largest support 16GB; Onboard 2 10/100/1000Mbps network interface; Support VGA + VGA, VGA + DVI dual display capabilities; Support 4 SATA interface; 10 USB 2.0 interfaces, 2 serial ports (1 of them Supports rich I/O interfaces such as RS-232/RS-422/RS-485 and 1 parallel port; PCI and ISA combo expansion can be performed through the backplane.
The whole chassis is a wall-mounted chassis. The chassis is made of 1.2mm thick high-quality steel sheet, sprayed with high-temperature baking paint, and has a strong structure. Has excellent heat dissipation, vibration and radiation resistance. It can meet the use of harsh working environments such as vibration and electromagnetic interference. The CPU board and backplane of the main control equipment adopt the Evobus design of EVOC, and the connection between the CPU board and the backplane is implemented using the CPCI pinhole connector. The chassis is small in size and suitable for installation in relatively small spaces.
VI. Advantages of EVOC products
1) The whole system adopts the EVOC EPE bus design. The CPCI pinhole connector is used between the CPU board and the backplane. It is surrounded by 360 degrees and has a high degree of hermeticity, anti-corrosion and oxidation resistance, and dust resistance. Dirty, wet, high/low temperature, corrosive and other industrial bad environment caused by contact with the contact surface between the plugging, oxidation or mold caused by poor electrical contact, completely eliminate the gold finger connection in the actual use of all the bad performance , to ensure the reliability of the IPC work;
2) Once the CPU board is in place, the relative displacement between the male and female contact surfaces of the CPCI pinhole connector will not occur, relative friction will not occur, the conductive layer will not be damaged, and the ability of the system to resist vibration and shock will be improved, ensuring the equipment Requirements for long-term reliable operation in vibration environments;
3) The unique CPU backplane bracket design shifts the weight of the CPU heat sink to the metal chassis, avoiding the CPCI's unbalanced contact force between the connectors and making the two connectors more stable without relative displacement. Further improve the ability of the whole machine to work reliably under vibration environment;
4) The EPE bus computer solves the problem that the traditional golden finger industrial computer platform cannot supply power through the backplane, resulting in complicated chassis routing; the EPE bus defines signals such as PS-ON#, 5V SBS(2A), and the 12V power supply has 5 pins that can withstand 7A Current, to avoid control connection between the backplane and the CPU board when using the ATX power supply;
5) The EPE bus system expansion interface prioritizes high-speed control signal routing in the signal distribution. The ground signal and the high-speed control signal pins are adjacent to each other, avoiding the influence of large distributed capacitance on the signal transmission line, thereby enhancing the signal. Integrity, enhanced EMC performance, enhanced reference and shielding of high-speed signals to the ground, making the PCI, PCIE extended signal quality has been greatly improved, ensuring the reliability of the system;
6) The whole system adopts oil cushion to cushion the hard disk, and the oil cushion is used for soft connection between the hard disk and its mounting bracket, which effectively avoids the hard collision between the hard disk and the bracket under external vibration and impact force. , In order to effectively protect the hard disk from vibration or impact damage; oil cushioning structure is simple, suitable for wide temperature environment, long service life, able to shock three-dimensional vibration, compatible with different weight objects shock absorption.
Seven conclusions
EVOC EPE bus products have the characteristics of long-term trouble-free and stable operation in harsh industrial environments, and can well meet the hardware requirements under various harsh environments such as dust, humidity, high/low temperature, corrosion and vibration.
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