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1. System overview
With the rapid development of urban economy and automobile industry, the number of urban cars, especially private cars, has surged, and a huge flow of cars has entered urban households. However, due to the lag in the construction of parking lots and parking facilities, the problems of parking difficulties and parking management have also arisen, especially in some high-end communities, enterprises, and government agencies. Disputes continue with parking management parties such as property. The intelligent parking lot management system using radio frequency identification RFID technology combined with image digital processing and automatic control can effectively solve the above parking management problems.
The RFID smart parking lot system can effectively, accurately and intelligently identify, collect, record and press the data information of system vehicles (vehicles with electronic license plates) and non-system vehicles (vehicles without electronic license plates) entering and leaving the parking lot. It needs to be uploaded, processed, and supplemented by corresponding manual intervention when necessary to avoid the impact of abnormal events (when non-system vehicles enter and exit) and ensure that the system has efficient vehicle intelligent release capabilities.
Second, the composition of the system
2.1 System topology
The intelligent parking lot management system can adopt various network topologies. The server and the management workstation are connected in the form of a local area network (LAN), and the computer is connected to the lower computer by RS485 bus type, which is simple, quick to put into use and good system stability. The highest rate of return on investment. The block diagram of its topology is as follows:
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Figure 1 System topology
2.2 Network topology diagram
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Figure 2 Network topology diagram
3. System workflow
3.1 Schematic diagram of approach
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Figure 3 Schematic diagram of approach
3.1.1 Monthly card holders and stored-value card holders
l Drive the car into the card reading area of the card reader, the reader will automatically sense the tag card on the vehicle and automatically open the barrier; the computer in the duty room will automatically check, record, and display the license plate;
l After the induction process is completed, a beep will sound and the process ends;
l The barriers are automatically raised, and the Chinese electronic display screen displays: “Welcome to the venue”, and a prompt tone will sound. If the card is read incorrectly, the Chinese electronic display screen will also display the reason, such as: “Insufficient amount”, “This card has been invalidated” “Wait;
l When the driver enters the venue by car, the barrier will automatically close after entering the venue.
3.1.2 Temporary parking users
l The driver drove the car to the card reader, and the person on duty entered the license plate number through the keyboard;
l The driver presses the card eject button located on the card reader to take out the card;
l Shake the card in the induction area of the card reader to read the license plate number into the card;
l After the induction process is completed, a beep will sound, and the Chinese display on the card reader will display the polite language, and the voice will be emitted simultaneously;
l The barrier is opened and the driver enters the venue by car, and the barrier is automatically closed after entering the venue.
3.2 Schematic diagram of appearance
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Figure 4 Schematic diagram of appearance
3.2.1 Monthly card holders, stored-value card holders
l Drive the car into the card reading area of the card reader, the reader will automatically sense the tag card on the vehicle and automatically open the barrier; the computer in the duty room will automatically check, record, and display the license plate;
l The card reader accepts information, the computer automatically records, deducts fees, and displays the license plate on the display screen for the duty officer to compare with the actual license plate to ensure the “one card, one vehicle” system and vehicle safety;
l After the induction process is completed, the card reader will make a beep to complete the process;
l The scrolling LED Chinese display on the panel of the card reader displays the subtitles “A good trip”. If you can’t show up, the reason will be displayed;
l The barriers are automatically raised, and the driver drives off the field. The barriers are automatically closed after leaving the field.
3.2.2 Temporary parking users
l The driver drove the car to the parking lot;
l Give the card to the attendant on duty;
l The attendant shakes the card in the sensing area of the toll meter, and the toll computer automatically charges according to the charging procedure;
l The billing result is automatically displayed on the computer display screen and the Chinese display screen on the card reader panel, and voice prompts are provided at the same time;
l Driver payment;
l The person on duty presses the computer confirmation button, and the computer automatically records the amount of money received;
l The Chinese display shows “A good way to go”, the barrier is opened, and the vehicle leaves the scene.
3.3 One-in-one-out parking system diagram
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Figure 5 One-in-one-out parking system diagram
Four, reader and label installation
4.1 Reader installation
Use the fasteners provided in the reader package box to fix it on a bracket or other wooden, cement or brick wall. The height of the reader from the ground between 2.0 meters and 2.8 meters works best. During the installation process, in order to achieve the best effect of the reader, the reader can be maintained at an angle from the vertical, that is, the depression angle, which is between 20 and 25°. The site can be installed according to the specific test results.
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Figure 6 Reader installation
4.1.1 On-site installation method one
There is no safety island in the middle of the road, and road control equipment (barriers) are installed on both sides of the road, and vehicles pass through the card reading area at a speed of less than 10 km/h.
Lane
Lane
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Figure 7 Site installation 1
4.1.2 On-site installation method two
The road has an isolated safety island, and the control equipment (barrier) is installed on the isolated safety island, and the vehicle speed is less than 10 km/h through the card reading area.
Lane
Safe way
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Figure 8 Site installation 2
Lane
4.2 Installation of electronic label
(1) The application of the electronic tag in the vehicle management system is to install the tag on the front windshield of the car cockpit, as shown in Figure 9. The specific installation position should be determined according to the installation position of the radio frequency antenna.
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Figure 9 Label installation
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Figure 10 Installation position without metal film
(2) The metal card encapsulated in the license plate.
If the front windshield of the car is equipped with a metal film, according to European standards, the car manufacturer reserves a 120mm long and 70mm wide microwave window without metal ion components for the electronic label at the position behind the upper reflector of the front windshield. Use, as long as the label is installed here when installing. See below:
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Figure 11 Installation position with metal film
Use metal tags to install the tags on the license plate, rain cover, roaster, etc. outside the car, but they need to be tamper-proof installation. The installation location can be as follows:
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Figure 12 Installation position of the metal label
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