Scheme of parking space dispatching and parking guidance system in bus station
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1. System overview
Many of the existing parking management systems on the market are simply the management of the entrance and exit passages of the parking lot.In fact, a complete parking lot management system should also include parking space guidance and parking scheduling control.White. In order to achieve the purpose of safety management of access channels, vehicle guidance in parking lots and parking space scheduling control,We install short-distance vehicle identification equipment on the side of each parking space and equip each car with a vehicle-specific identityThe identification card is used to identify whether there is a car in the parking space and what kind of car it is, and to install a long distance at the entrance of the parking lotThe vehicle identification equipment is used to judge and identify the time when the vehicle enters and exits the parking lot.Use radio frequency management equipment to achieveComplete vehicle identification, coupled with our company’s targeted research and development of the parking lot management system to achieve system automatic overall planningThe overall function of automatic allocation of parking spaces.
2. Overall design
The workstations and upper computers of the various subsystems of the vehicle identification equipment reside in the high-speed management information domain of the system.Use an external power supply, and use RS485 as the bus in parallel, and the total server can be connected through the bus controller.Total controlIntranet can directly access the system through INTRANET and automatically arrange parking spaces according to the system.The driver parked the vehicle into a certain parking space.The most advanced industrial control is adopted between the subsystem workstation and the on-site control pointThe network is used as a communication link between distributed control equipment and data acquisition equipment. The total system database supports ODBCAccess, the integrated computer IBMS can establish a communication connection with it through the local area network, and read its database,Write access.
2.1 System design principles
When designing the system integration scheme, the following principles were fully considered and followed:
Advanced
The system adopts an intelligent modular design idea, and the system server integrates various subsystems through EthernetOn a computer-supported platform, the interface of the “Parking Space Management System” for the entire area is established.PassThrough this unified interface, it is very convenient and simple to realize the monitoring and control of the integrated subsystems.System and management.
safety
Each subsystem maintains the principle of mutual independence, which can reduce the possibility of simultaneous failure.Multi-level authority control technology, different operators have different problems on different subsystems or management workstations.The same operation authority makes the system safer and management more convenient.Event tracking technology, that is, “log management” has a complete function, which can record all operation behaviors and system status, For management and evidence collection purposes.Integrated management system (IMS, Integrated Management System) dual-system hot backup, the database can be automaticallyActive backup, firewall software can be installed on the server and each management workstation to improve data security.
Practicality
All adopt WINDOWS interface operation technology, and now the most popular webpage homepage interface man-machine exchange technology.The operation adopts the following pull-up menu, pop-up box and the combination of left and right mouse buttons, with perfect functions and friendlyPractical and easy to master. The system has an automatic service function, which can collect data in real time, update the blacklist, and synchronize the system time.
Compatibility and scalability
Each subsystem runs in the system as a module, and other functional subsystem modules can be added at any time. Each database adopts the same database technology to improve the efficiency of integration and management. Each subsystem and integrated management system (IMS) support ODBC technology to make the system open,Subsystems and even Integrated Management System (IMS) lay the foundation for integration with other external systems.
2.2 System design description
Features of long-distance recognition equipment
Ø Long-distance identification equipment uses radio frequency technology (RFID) as the core, and the frequency band is free and open to ISM worldwideFrequency band (2.4G), which determines the characteristics of the identification card and many performances of the card reader.
Ø The long-distance smart radio frequency card is made with advanced chip manufacturing technology.The card is small in size (similar to the name)The film is large), thinner, and the card is initially conceived to be uniformly glued to the upper left corner of the rear windshield of each car.
Ø Long-distance smart radio frequency card adopts active labeling method, built-in button battery, normal working life 2Over years; the parking space card reader can only identify the tags of the vehicles in the parking space.
Ø A long-distance vehicle identification device is installed at the gate, that is, a long-distance card reader, which can identify incoming vehicles from a long distance.The vehicle tag of the parking lot is automatically uploaded to the server.
Ø When the card is manufactured, it has a unique card serial number, and there is no duplicate of the same two cards.
Ø It is safe and reliable, and the chance of misreading or not reading the card is almost zero.
Ø It is very simple to report the loss of the long-distance vehicle identification card.If the used card is lost, a new card can be used immediatelyMake up and register again. The old card will then automatically become invalid.
3. System application
u Parking lot management: ***Manage the entry and exit of vehicles in the parking lot, parking space scheduling, etc.
System topology diagram:
4. System characteristics
The 485 bus is deployed when the network is wired, the data backend adopts SQL SERVER2000 storage (supports dual-machine hot backup), and the data is centrally managed. Administrators and operators at all levels can call various business subsystems according to their authority, and share vehicle entry and exit information and parking space arrangement information. Realize the collaborative work of various departments. This method guarantees data security, reduces system risks, reduces the workload of SYSTEM, speeds up data processing (data processing can be paralleled by multiple workstations), and facilitates inquiries by agency leaders. The system structure adopts a modular approach. When the company issues cards, the application format of each application subsystem has been determined. When each subsystem is added in the future, there is no need to reissue the card, and it can be used directly, and the vehicle information of each system is unified. manage.
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