Key Technology Research Of Networked Electric Bicycle Charging Pile Platform

Under the background that public's appeal for traffic convenience and environmen-tal protection is increasing day by day,social security of electric bicycles is increasing likewise,which promotes development to safety and intelligence of public charging pile industry.The existing coin-based public charging piles are in the stage of trans-forming to networked charging piles,but there is a phenomenon of unstable service during the peak charging period,mainly because the platform does not have sufficient support for high concurrent access.In addition,the existing charging piles are owned by different manufacturers,and each of them is often develops and deploys a system by their own during the transformation,which increases the cost of the construction of the charging pile industry.In view of the problems in the existing transformation stage,this paper proposes a distributed charging pile platform architecture and a cloud-based multi-tenant system design.Specifically,the following work is mainly carried out:1.The overall architecture design of the access platform of the networked charging pile was studied.The platform was divided into four modules:IoT Hub,registration center,device shadow and rule engine.For the IoT Hub module,through distributed session management and server communication,the design solves the shortcomings of traditional server access capability,and uses Raft algorithm to keep data consistence.For the registration center,by introducing AR(3)prediction,the improved load balance based on greedy algorithm solves the problem of data skew in the traditional load bal-ancing algorithm.The necessity and implementation method of the device shadow and rule engine module are also fully discussed.The four modules work together to provide a highly efficient,secure access service with low information loss rate.2.From the purpose of satisfying the multitenant sharing charging pile platform,the SaaS multigroup design was introduced into the system.Firstly,the IoT Hub mod-ule was improved to enable differentiating and authenticating multiple tenants.Then,the technical scheme of storing multitenant data is discussed.The structure design of data table supporting multilevel index based on nonrelational database is proposed.Al-so,Elasticsearch helps to realize federated index.Finally,in view of the multitenant application customization requirements,the idea of abstracting tenant configuration da-ta in the system and the solution of the atomic function combination are proposed.3.The implementation and testing of the access platform and multitenant archi-tecture design was completed.The access server cluster is built and compared with the commercial EMQTT cluster.It proves that the design of this paper is not lost in the existing commercial system in terms of connection capability,processing capability and message loss rate.For multitenant data storage,this paper designs basic addition,deletion and change performance test and multitenant customized query test.In both experiments,it has passed test by largescale data.4.Based on the distributed charging pile access platform for communication be-tween the cloud and the device in 1,as well as the multigroup data storage mode to store system data and service data in 2,the data communication format and data table structure were designed,the networked charging pile remote control management sys-tem was built to realize the real-time interaction requirements between administrators and users and charging piles.Finally,the K-means clustering analysis was used to mine the user's usage rules and the Pearson correlation analysis was used to explore the key characteristics of the network revenue.