| Considering the application of virtual reality technology in the testing of electric vehicle dynamic performance,it can solve the shortage of automobile test site,reduce the safety of personal accidents,shorten the research and development cycle,which is of pivotal significance to the development of the automobile industry.Therefore,according to the current development status of virtual reality technology,based on three-dimensional modeling technology,visual simulation technology and vehicle dynamics theory,this thesis designed and constructed a virtual test platform for electric vehicle dynamic performance,and realized immersive and interactive electric vehicle dynamic performance testing in the virtual vehicle test site.The main research contents of this thesis are as follows:(1)On the basis of detailed analysis of virtual reality technology theory,taking immersive virtual reality system as the research object,the overall scheme of electric vehicle dynamic performance virtual test simulation platform is designed,and the software and hardware systems of the virtual reality simulation platform for electric vehicle are constructed.(2)A virtual simulation test site for electric vehicle dynamic performance based on Unity3 D environment was constructed,including 8 different types of test roads,such as high-speed ring road,straight-line comprehensive road and standard ramp.Through the simulation analysis of the high-speed loop,it is known that the normal and longitudinal acceleration generated by the road surface are 2.81 times and 1.21 times of the human sensory threshold,which meets the requirements of the national standard of T/CECS G: T10-2018 "Technical Specification for Special Road Design and Construction of Automobile Test Ground" and the road test standards.Based on an electric vehicle,parametric modeling was carried out,including body,tire,steering wheel,seat and other components.On this basis,the virtual test site is added to include vegetation,grass,sky box,rain,snow,sound and other environments,so that it can get a more real driving sense.(3)Based on actual motor performance test data and Map map,motor driving characteristics were constructed as power input;Write C# script,establish electric vehicle dynamic performance simulation module,including power input,drive control and speed conversion sub-modules;At the same time develop UI visual interface,including speed realtime feedback and timing function;On this basis,a human-vehicle immersive driving interaction platform is constructed,and the function design and implementation of the driving platform are carried out.Through the steering and trajectory simulation tests at speeds of 45km/h,55km/h and 65km/h,it is verified that the human-computer interactive driving platform has good interaction and responsiveness,and can be used for the dynamic performance test of electric vehicles.(4)According to GB/T 18385-2005 "Test Methods for Dynamic Performance of Electric Vehicles",a virtual simulation test of the dynamic performance of an electric vehicle was carried out.Through comparison and analysis with the test values of real vehicles,it was concluded that: The simulation error of the maximum speed of the vehicle is 1.8%,the start acceleration time error is 8.3%,and the overtaking acceleration time error is 3.75%.The maximum climbing slope can reach the requirement of 30%,which meets the requirements of the electric vehicle dynamic performance test.It lays a good foundation for enriching other performance tests of electric vehicles in the next step. |
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