Research On Zigbee-based Shared Parking Space Parking Guidance System And Allocation Model

With the increase of car ownership in China,the problem of difficult parking has become more and more prominent,and shared parking spaces have started to appear as an effective solution.The centralized allocation and management of shared parking spaces and parking guidance can effectively reduce vehicle parking cruising,thereby alleviating local traffic congestion during peak periods and increasing the willingness of vehicle owners to use shared parking spaces.Therefore,this thesis proposes a Zigbee-based shared parking space allocation model and parking guidance system.First of all,in order to realize centralized parking space management and parking guidance,Zigbee wireless communication network is built,and Zigbee communication modules with parking space and vehicle detection functions are laid in parking spaces,and communication is established for different types of Zigbee communication modules through specific networking rules.Further,a mesh Zigbee network established under specific rules is used to monitor the parking situation in real time thus providing parking space data support for the allocation model,and to determine the relative position of the entering vehicles and indoor parking guidance,solving the problem of low parking efficiency of vehicles under unfamiliar parking lots,reducing parade congestion in the field and improving the efficiency of entry.Secondly,in order to solve the problem that individual parking lots as the optimal choice for users in the same area cause road congestion around the peak period and waste of resources due to uneven use of parking resources,this thesis proposes to divide the peak commuting period into continuous time segments with Markovianity.The congestion delay index is predicted by Markov prediction method to determine the road capacity of the road where each parking lot entrance is located at each time period.And then,using the Greenshields model as well as the LWR traffic continuity model,the road traffic flow state under the corresponding congestion delay index and the traffic increment that can be carried to the next stage index are calculated.Finally,the calculation results combined with the available parking space data obtained by the server through the Zigbee wireless communication network are used to make timely adjustments to the parking allocation for shared parking users in order to build an allocation model that serves to reduce local traffic congestion and improve the overall parking efficiency of shared parking users.Finally,the model calculation and simulation analysis are carried out in a place in Huizhou City as an example.The data parameters that are as similar as possible to the actual road conditions are set in the vissim traffic simulation software,and the traffic flow data obtained from the distribution model calculation is combined with the simulation analysis to output the road network traffic flow data.The data show that the assignment model can save a total of 8.9 minutes of parking cruising time for shared space users in 5 minutes under the assumed simulation conditions,and can reduce 220 minutes of roadway travel time for all general vehicle owners passing through the corresponding roadways.This shows that the allocation model can effectively reduce the overall parking cruise time of shared space users as well as the overall passing time of passing vehicles while balancing the burden on the road network.In addition,the real-time car parking information monitoring system can provide data support for the allocation system and improve the effectiveness of the allocation model.