Design And Implementation Of Automatic Test Platform For DC Charging Pile Of Electric Vehicle

In recent years,in order to promote the development of the new energy electric vehicle industry,major cities in the country are making efforts to build DC charging piles and other infrastructure.Since the construction of the charging pile is now in its infancy,many cities must have some problems when constructing the charging pile.For example,when technicians inspect DC charging piles on site,it is found that the installed charging piles still have faults.In the final analysis,enterprises cannot fully detect charging piles when the DC charging piles are tested at the factory.In addition,due to the low efficiency of traditional manual or semi-automated testing techniques,charging pile testing is much more complex than power supply testing.Enterprises urgently need efficient automated inspection platforms to rapidly inspect large quantities of charging piles to meet production needs.Therefore,research and design of DC charging pile automatic test platform is of great significance to solve the above problems.This dissertation mainly studies and implements an automatic test platform for DC charging piles of electric vehicles.The details are as follows:(1)The task of the automatic test system was first proposed based on the test requirements of the charging pile.According to the related national standards of charging piles,a design scheme of DC charging pile automatic testing platform was proposed.(2)Design of electric vehicle simulator.The electric vehicle simulation device needs to simulate various states of the electric vehicle to test the DC charging pile,especially the fault simulation test of the electric vehicle.Electric vehicle simulation devices can be divided into two parts: DC charging line simulation and BMS communication message simulation.Based on the working principle of electric vehicles and charging piles,the design of a DC charging circuit simulator and an electric vehicle BMS simulator is realized.(3)Design of automatic test software.The main function of the automatic test system software is the testing of complex test tasks and the generation of test reports.There are many integrated instruments in this automatic test system,and the communication with each instrument is realized through the virtual instrument architecture.After the execution of the test task is completed,a large amount of test data needs to be exported to the test report table.Based on the EPPlus open source library,the replacement of data and charts in the report template is realized.Finally,all the data and charts can be inserted into the EXCEl format report template.The software development environment was developed in Visual Studio 2013 in the Visual C# project.The system has many test tasks and the test task execution process is more complex.Compared to the common power supply test,the system involves complicated communication between the charging pile and the BMS simulator,which greatly increases the difficulty of software design.In the end,this system tested the electrical characteristics,protocol consistency,and interoperability of Nanjing Renrui's charging piles.The results show that the system not only can fully test charging piles according to national standards,but also greatly improves the company's test efficiency.At the same time,according to the actual test experience,an optimized solution that can be achieved is proposed.