Research And Designation On The Chassis Layout Of Electric Vehicle

Accelerating the development of New Energy Vehicles is vital for the solution of Energy shortage and mollifying environmental pressures.As one important part of the development of new energy vehicles,electric vehicle have been listed as key development areas in Made in China 2025.It indicates the future development of China’s automotive industry.At present,new energy product development in China’s automobile enterprises are lagging behind,especially in special chassis for electric vehicle and chassis layout of electric vehicle.It is necessary to carry out research in related fields,providing analysis and reference for the electric car chassis layout.In this paper,the motor,transmission system and power battery parameters have been designed based on one commercially available electric vehicle parameters and performance.3D models for different chassis layout of electric vehicle were built to obtain the dynamic moment of inertia and mass centre coordinate.In order to facilitate the handling stability and ride comfort simulation analysis,electric vehicle models for different chassis layouts was built.It inclueded front and rear suspension,braking,steering,drive motor,power battery,front and rear tires,passenger seats and vehicle body.Through the simulation of linear acceleration and the circumference of the vehicle movement,the model was reasonable and feasible.The following simulation of handling performance for different chassis layouts were tested.The results indicate that handling performance of the third chassis layout scheme was the best.The gravity center position forward and lower chassis layout can improve the handling performance.In the simulation of ride comfort for different chassis layouts,the results indicated:In the random input ride simulation,the root mean square value of weighted acceleration(RMS)of paasengers’ seat value from third chssis layout was relatively small,but the higher the speed,the worse the ride comfort of three chassis layout.In the simulation of the convex block pulse,the three kinds of chassis layout have good ride performance,which will not have adverse effects on the crew.The flexible lower control arm model of front suspensions was built.Compared with the original rigid body model,the results indicated that the flexible body can can reduce vibration.The peak value of vehicle yaw velocity decreased 6.6%,peak value of lateral acceleration decreased 6.9%,peak value of lateral slip for tires decreased 4.6%and 7.6%respectively.The handling performance was improved.Flexible connection was established,and by the result of random input ride simulation,RMS reduced by 33.1%.It means that passengers ride comfort has been effectively improved.