Research On The Optimal Collapse Distance Of Electric Power Assisted Steering System(C-EPS) For Micro Electric Vehicles

With the development of the times,more and more people choose to use electric vehicles as their means of transportation,and micro-electric vehicles are gradually being pursued by people on increasingly crowded roads.However,researchers mainly focus on faster and more expensive electric vehicles for their safety issues,and pay less attention to micro electric vehicles.This article takes the optimal collapse distance of the power-assisted steering system in micro electric vehicles as the research object,revealing the relationship between the collapse distance of the power-assisted steering system and human head injury and chest injury,and clarifying the optimal collapse distance range of the steering column during collisions,which is beneficial for reducing driver injuries in accidents and providing a basis for the design and development of passive safety equipment in automotive accidents,It has significant practical significance.Firstly,based on the micro electric vehicle power steering system,this article provides a detailed explanation of the energy absorption and collapse principle of the electric power steering system,and analyzes the various energy absorption components of the steering mechanism.Secondly,based on the actual data of the physical two-dimensional drawings,SolidWorks was used to conduct three-dimensional modeling of various components of the steering mechanism.After completing the three-dimensional modeling,Hyperwork software was used to mesh and assign material properties to each three-dimensional component of the steering system.CAE analysis was also conducted on the upper and lower column pipes and shaft assemblies of the electric power steering system using HyperMesh,At the same time,conduct static pressure experiments on the above components and compare the obtained experimental curves and simulation curves to determine the reliability of the part model constructed in this simulation.To ensure the accuracy and reliability of the overall simulation model of the steering mechanism,the verified parts involved in the collapse are referred to the national standard GB/T11557,The collision simulation between the electric steering system and the human body module is constructed according to relevant experimental requirements(such as angle and speed).To ensure the reliability of simulation results,a dummy module model collision test is conducted,comparing the horizontal force-time curve of the test dummy’s chest with the simulation results,and optimizing the steering mechanism model to ensure the accuracy of the electric steering system model.Finally,by combining the above steering mechanism with the trolley model and changing the folding distance of the steering mechanism,17 sets of collision simulations are conducted to obtain two sets of data,namely,the collapse distance of the electric steering column,the head injury of the dummy,and the displacement of the dummy’s chest.Through two data sets,this article obtained the mathematical relationship between the collapse distance of the steering column and driver head and chest injuries.The optimal collapse distance of the steering column is found to be 60mm～65mm.It is found that micro electric vehicles without airbag protection cannot effectively protect driver safety through the power steering system and other energy-absorbing collision prevention components.It is necessary to combine the security of airbags to protect the driver from collision injuries effectively.