Automatic parking management system for VD300 wireless vehicle detector products
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I. Introduction
With the rapid development of my country’s automobile industry, the problem of “difficult parking” in cities is quite serious. It is urgent to improve parking conditions and parking facilities, and improve efficiency. Moreover, the large-scale parking lots in my country did not have intelligent parking space management systems, and the parking spaces were managed by the parking lot staff in different areas. For users, it is still relatively difficult for users to quickly reach effective parking spaces in a large parking lot, which will result in low overall operation efficiency of the parking lot, and even management confusion due to the inconvenience of parking.
In order to effectively solve the problem of random parking and improve the efficiency of parking spaces, Sunsun Technology uses its technical advantages in the field of wireless sensing and adopts the VD300 series of ground-sensing, geomagnetic, ultrasonic, and RF vehicle detectors to provide all-weather parking space automation management for various environments System solutions. The management system can count the free parking spaces in time, allocate user-designated parking spaces, speed up the parking speed of users, improve the operating efficiency of the parking lot, and save costs. In particular, Shengyang’s unique CAN&RFeild Bus hybrid wireless field bus is used to complete data collection including various vehicle detectors in the open and underground, and is released through the center to form an automated management system that automatically displays the information of free parking spaces.
2. The overall design of the system
The VD300 series of vehicle detector products are a series of vehicle detector products developed by Liming Shengyang Electronic Technology Research Institute in response to the needs of the development of dynamic | static intelligent transportation systems. Among them, the VD300B and VD300D wireless vehicle detectors provide low-cost, high-reliability and applicability wireless parking detection solutions for static parking detection. The VD3x0B series is suitable for outdoor harsh environments and uses surface installation. The VD300D series adopts ultrasonic detection method, which is only suitable for indoor environment and must be top-mounted.
The system uses wireless transceivers to realize parking space detection and intelligent management of the parking lot, and is composed of a central information processing node and multiple wireless sensor detection nodes. The central node is composed of receiving module, single chip microcomputer minimum system and display liquid crystal to realize the intelligent management of parking spaces; and parking space detector (sensing sensor node) is installed in each parking space, and the application includes eddy current parking space detection technology, embedded The integrated single-chip microcomputer and RF technology report the status information of the parking space to the parking management center node. The information of each detection point is processed at the system terminal, the central node, and the terminal results are displayed through media such as screens and signal lights.
3. The advanced nature of applied products and technology
The VD300B series wireless vehicle detector is a wireless vehicle detector (sensor) product developed by Shengyang Technology for the application of urban parking Internet of Things. It applies advanced eddy current detection technology, geomagnetic detection technology and radio frequency technology, whether it is in the detection Accuracy (>99%), anti-interference (with obvious detection direction and boundary, adjacent parking spaces do not interfere with each other), wireless communication (two-way interaction, automatic frequency hopping, in line with FCC standards, power consumption <10mw, distance visual range> 100M), industrial grade design (waterproof IPX7) and long-term low power consumption (10-year service life and solar power supply) and other indicators far exceed similar foreign products.
Among them, VD300B is the existence type vehicle detection, adopts the eddy current detection method, VD310 is the passing type vehicle detection, adopts the geomagnetic detection technology method, and the VD320 uses the hybrid detection method. The VD300 series are all powered by solar energy and have a service life of >10 years.
VD300BS adopts a 10db high-gain fiberglass omni-directional antenna to receive the antenna, which can receive wireless vehicle inspection information within the diameter range of 200-300M (line of sight, 2.5m installation height, outdoor weather), and high-gain orientation can be used for roadside parking. The antenna will effectively increase the receiving distance and signal strength.
VD300BS is a fully dynamic route, which can form a network relay with other base stations. Each base station is a relay point; it adopts a mesh structure instead of a tree structure with a fixed route. Its communication path types include relay, primary relay, secondary relay, and tertiary relay. The transmission distance between two distributed nodes can reach up to 500 meters, and the longest distance (three-level relay) can completely transmit one kilometer.
VD300B far exceeds similar foreign products in terms of indicators and performance. The following is a comparison from wireless communication, testing technology and manufacturing technology:
1. VD300B has 433M|866M|915M that can be selected. In Mainland China, the 433M ISM frequency band is selected, and the 2.4G ISM frequency band used by VD100BVD200B. The upgraded VD3X0B uses a lower frequency band. The reasons are:
The 433MHz frequency band is selected, and its wavelength is about 1 meter, which can easily bypass large obstacles such as cars and containers. However, when the 2.4GHz frequency band is selected, its wavelength is only about 0.1 meters, and the corresponding diffraction ability is much more limited. Compared with the 433M, there will be more blind spots and the effective range will be small.
2. The choice of power limit and communication distance: when different frequencies are used, there is still a big difference in the transmission power, the transmission power limit: 10mW (erp). For example, when 433MHz is selected, the transmission power is required to be within 10mW, which can reach a communication distance of 300 meters; if 2.4MHz is selected, the maximum distance is less than 100 meters.
3. VD300B uses eddy current detection technology to directly detect the presence of vehicles, while similar foreign products use the geomagnetic detection method used by VD310B to indirectly determine the presence of vehicles through changes in geomagnetism.
VD300B adopts the method of direct detection of vehicles. Its advantage is that the detection of vehicle presence is much more stable and reliable than the geomagnetic detection method, and at the same time it is more energy-saving. The geomagnetic detection method used by VD310B is the impact of the vehicle on the geomagnetism at the moment of passing, so it is suitable for passing-through detection, and the accuracy and stability of vehicle parking detection are not as good as the VD300B using eddy current detection technology.
Our solution is for the detection of the existence of parking spaces, so we use VD300B as the sensor instead of VD310B. As a passing vehicle detection, VD310B is mainly used for vehicle pass counting detection in lanes and red light running captures. VD320B mixes two detection methods and is specially developed for application environments that require both pass-through and presence detection accuracy. The most typical application is an intelligent traffic light system at an intersection, which takes into account both static and dynamic vehicle detection.
4. The VD300B series of wireless vehicle detector products have been upgraded from VD100200 continuous software and hardware versions, and their accuracy and stability meet various application environments.
The user sets the detection threshold: the user can adjust the equipment to the best working condition through the setting and fine-tuning of different car, no car and interference thresholds;
VD300BS (CV200A+CV200D) is the receiving base station corresponding to VD3X0B. VD300B and VD300B adopt two-way data interaction, which can ensure stable and reliable data exchange between VD3X0B and VD300BS.
VD3X0B adopts wireless frequency modulation communication, compared with fixed frequency communication, it has good anti-interference ability, even if some frequency points are interfered.
VD3X0B sends detection value, change value, voltage value, communication signal strength and other indicators to the base station, which are functions that other similar devices do not have. It helps the server to monitor the working status of each device and respond to abnormal situations in a timely manner.
5. VD300B’s extremely low power consumption is suitable for solar power supply, thus extending the service life to more than 10 years, while similar foreign products generally use battery power supply, and the service life is basically within 3 years.
The average power consumption of VD300B is only 20ua at the lowest and 80ua at the highest. It is equipped with a 600mah rechargeable lithium polymer battery and a solar panel with a peak charging current of 20ma. It can work continuously for 0.5-1 years without charging, and the minimum 300 times according to the lithium battery The charging and discharging life, its theoretical life is far more than 15 years, which is mainly restricted by the life of the lithium polymer battery.
6. VD300B industrial outdoor grade design, IPX7 or higher, in terms of waterproof, anti-rolling, high-temperature resistance, etc., it is designed in accordance with the military grade and exceeds the civilian grade of similar foreign products.
The shell is made of high-strength epoxy resin material, which has higher strength and hardness than similar products ABS;
The solar panel uses high-grade PC, which is far more rigid and rigid than ABS.
Using outdoor single crystal (VD300B) and amorphous (VD310B | VD320B) solar panels can reach a life span of 15 years;
The interior uses polyurethane + epoxy resin potting glue, insulation, combustion-supporting heat insulation and waterproofing, and it can work reliably and stably in low temperature (-70oc) and high temperature (+85oc) environments.
4. The working process of the system is as follows:
When a vehicle enters a parking space, a wireless parking space detector installed on the ground detects the vehicle, and sends the detection data to the base station on the roadside in real time, and the base station transmits the management center server in real time via wired broadband or wireless 3G network. When the vehicle leaves the parking space, the information about the vehicle leaving the parking space is transmitted to the management center server.
Due to the wireless parking space detector and its communication base station, the management center can obtain parking space information in real time, and has accurate, reliable, real-time and effective important information that is accurate to the usage of each parking space. Realize the openness and sharing of urban traffic information. Traffic information can be obtained through teletext, radio, telephone, radio and mobile phone SMS inquiries, and even through Internet access, the use of every parking lot and every parking space in the city can be obtained.
Since the management center has accurate usage information of all parking spaces, the guidance service provided is the precise urban guidance based on the parking space information system.
The driver arrives at the parking lot according to the guidance of the electronic display screen (location guidance), and finds the parking space (parking guidance) through the display device in the stadium. The change in the state of the parking space after the driver has parked, or the change in the state of the parking space after the original parked vehicle has left the parking space, can be transmitted to the management center in real time, and the management center will feedback the changed parking space information status to the front-end electronic display in real time The guide card, through a series of equipment and related networks, including wireless parking detectors, base stations, GPRS networks, Internet, etc., forms a complete information collection, transmission, processing, and release process to realize the integration of parking spaces, drivers, and management departments. The organic connection between the two, precise parking guidance can provide users with a way to quickly find parking spaces.
5. Application of Precise Parking Guidance——Traffic Guidance
Through the collection, processing and release of traffic information in the parking lot and related roads, the organic connection between the driver, the parking lot and the management department is realized, and the parking guidance information system is displayed in real time at the main location and even the departure point. Information on the current vacant parking spaces or presence/absence of vacant parking spaces in the yard, and at the same time aggregate and analyze the traffic flow, parking space occupancy rate and other data of each parking lot, and achieve coordination with the surrounding road traffic signal control and management systems. It can make vehicles entering the area know the real-time information of the main parking garage in the area in time, so that the driver can find a suitable parking garage, and finally guide the vehicle into the parking space, avoid blindly driving in, reduce the time to find a parking space, and improve efficient.
6. Value-added services of precise parking space induction-parking space reservation
Because it can obtain the precise parking space status, there are two kinds of reserved parking space services: one is the time sharing reservation service; the other is the real-time reservation service. In the time-sharing reservation service, travelers need to determine when they plan to enter the parking lot and when they plan to leave the parking lot, and they need to pay parking fees in advance. If the user has not left after the scheduled time, an additional fee will be paid. In the real-time reservation service, the reservation fee paid by the user is the parking fee between the scheduled time and the scheduled time for entering the parking lot. After entering the parking lot, the vehicle will be charged the same as a vehicle without reservation. If the actual parking fee is less than the scheduled fee, the difference will be returned to the booker. This kind of service is suitable for users who must reach the area near the parking lot in the shortest possible time.
Seven, expansion module-wireless live photo
Collect the analog video signal from the CCD camera through the remote data image collector, and then encode and compress the image data into digital video data. Finally, the CDMA1X/GPRS/EDGE wireless transmission module is used to send the video and field data to the image data monitoring server in the form of IP packets. The image data monitoring server and the image data monitoring client are PCs equipped with remote image monitoring server software and client software respectively. They are both connected to the interconnection network. Because the remote data image collector does not have a fixed IP address, The client actively browses the monitoring images and sets the monitoring parameters through the server to transfer.
It can monitor the real-time situation of the parking lot from multiple angles at any time of the day; determine the location of the camera according to the actual situation of the parking lot, and use a wide-angle lens to achieve the largest photographing range;
1. High-resolution infrared camera
Using high-resolution infrared waterproof camera, it can still take pictures clearly in rainy weather and dark night;
2. Photo information return
It can take a snapshot of the scene and send it back to the center in time, and reflect it immediately, and can supervise the management staff to conduct on-site inspections to ensure safety. You can set to take pictures manually, or take pictures automatically at regular intervals.
3. Parking space monitoring and on-site alarm
When letting in the car, understand the remaining vacant spaces in the parking lot, whether the parking space is occupied, and whether the vehicle is safe. In the case of photos being posted back,
4. Web release
Log in via computer or mobile phone: mobi-parking.com can see the real-time status of each parking lot. You can set the notification method: SMS, email, MMS, etc.
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