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1. Introduction of parking guidance system
The parking guidance system is mainly suitable for large and medium-sized parking lots, and is widely used in public parking lots such as government office buildings, railway stations and shopping centers. The main working principle is to use the wireless geomagnetic vehicle detector to detect the presence or absence of vehicles in each parking space, and then transmit the parking information of each parking space to the control computer through the network line. The computer processes the software and transmits the guidance signal to the guidance indicator. The indicator guides the driver to quickly find a vacant seat.
The main features of the parking guidance system: increase the utilization rate of the parking lot, and better manage the parking lot, reduce the operating cost of large and medium-sized parking lots, and greatly improve the social and economic benefits. Eliminate parking troubles for customers, easily park, save time, and improve efficiency. It is one of the necessary systems for high-end parking lots, and it is a comprehensive manifestation of strength.
The parking guidance system shows humanized management from the subtleties, which further improves the management level of the parking lot.
Its working principle is: first collect the parking space related information of the parking lot through the data acquisition system of the parking lot, and send the information to the parking guidance control system through the data transmission network according to certain rules, and the central control system analyzes and processes the information. Put it on the database server and distribute it to the information publishing system to provide information services. For parking space information in the database server, the system provides a data query interface.
2. Benefits of parking guidance system
(1) Improve parking efficiency
In parking lots that do not use the parking guidance system, drivers often drive ineffectively at low speeds in the parking lot and reduce lane circulation in the parking lot. In parking lots using the parking guidance system, drivers can find empty parking spaces accurately, safely and efficiently through eye-catching guidance screens.
(2) Increase parking spaces
Increase the number of parking spaces through redesign, improve the flow of vehicles, reduce lane space and increase parking spaces: generally 3 to 5% of the increase in parking spaces.
3. Working principle of parking detector
3.1 Wireless geomagnetic vehicle detector method
The principle of geomagnetic detection is used to detect motor vehicles. In the absence of motor vehicles, the earth’s magnetic field is in a relatively stable state. When a motor vehicle passes by, it will cause changes in the earth’s magnetic field. The wireless geomagnetic vehicle detector detects motor vehicles by analyzing changes in the earth’s magnetic field. The wireless geomagnetic vehicle detector is embedded in the ground and powered by its own battery. The vehicle information (existence, traffic, speed, vehicle length, occupancy and other traffic parameters) detected by the detector is sent wirelessly to the roadside installation Signal receiver, which transmits vehicle information to application systems, such as traffic collection systems.
The wireless geomagnetic vehicle detector is buried under the surface of the parking space. Whenever a vehicle stops, it detects the arrival of the vehicle according to the changes in the magnetic field around the ground. After the signal is stable, the signal is sent to the receiver installed in the appropriate position. Similarly, when the vehicle leaves, the wireless geomagnetic vehicle detector can also detect this information based on the change in the magnetic field and inform the receiver. The same receiver can detect the usage status of about 20 parking spaces at the same time. Scheme diagram:
The receiver (reader) can transmit the received signal to the background through zigbee wireless communication, and the background application software refreshes the parking space occupancy status according to the signal, so that the system can accurately grasp the actual occupancy of each parking space. Maximizing the use of resources, in conjunction with parking guidance screens, can play a role in dispersing traffic and reducing congestion during peak traffic hours. At the same time, the problem of “finding a car” in some super-large parking lots is easily solved. When a vehicle enters the parking lot, the system automatically allocates parking spaces and drives and parks in accordance with the directions specified by the system, so that car owners can accurately find their parking location.
4. System components
The parking space guidance system of the parking lot is mainly composed of the following:
2) Wireless geomagnetic vehicle detector:
The geomagnetic induction wireless vehicle detector using RFID technology can effectively solve the problem of parking space detection and statistics in large parking lots. Based on the design of the Xiupai micro-power technology platform, it can be maintenance-free for about five years, and has certain advantages in performance, cost, system installation and maintenance. Features of wireless geomagnetic detector.
High precision: The geomagnetism is basically constant within a certain range, but large ferromagnetic objects will cause huge disturbances to the earth’s magnetic field. The geomagnetic sensor can distinguish the change of 1 in 6000 of the earth’s magnetic field, and when a vehicle passes by, it will affect the geomagnetism. The influence will reach a fraction of the strength of the geomagnetism, so the use of geomagnetic sensors to detect vehicles has extremely high sensitivity, accuracy and high.
Installation and maintenance are convenient, no excavation and construction are required, and the damage to the ground is small.
The geomagnetic sensor uses the changing magnetic field of ferromagnetic objects to detect it, and it is not affected by the weather.
The two-way high-speed data exchange can be realized between the detector and the receiver, and there is no need to worry about the simultaneous data exchange between each detector and the receiver.
High reliability, working temperature -40℃~85℃, moisture-proof and shock-proof.
High anti-interference: no special requirements for various interference sources.
There is no need to apply for and pay for the ISM microwave frequency band that is open worldwide.
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