FSEC Racing Car Transmission System Design And Research On Torque Distribution Control Strategy

Formula Student Electric of China(referred to FSEC)The first event was successfully held in November 2015,has gone through five years,FSEC team has grown,but also trained a number of outstanding automotive engineer.With the various schools of domestic R & D team increasingly high level,a variety of "black technology",the new technology is widely used in the car.In terms of power transmission system of four independent motor drive system as a new technology,it has begun to be applied more and more schools in their own cars.This article is based on the four-motor independent driven racing car preparatory research project of the Liaoning University of Technology Wonder Racing Team of electricity.Car transmission system design include matching transmission ratio of the planetary gear design and wheel reducer integrated design.The transmission ratio is matched according to the dynamic characteristics and sports characteristics of the car.Reducer wheel arrangement according to design appropriate engineering design methods and processes and a reasonable gear calculation parameters selected.Creating 3D models of the all parts in and using the DMU module core member for the planetary gear reducer transmission gear ratio and motion verification interference simulation.The paper uses ANSYS to perform finite element analysis on the parts to verify whether the strength of the parts meets the engineering requirements.In terms of Torque vectoring control,the control goal is to have good driving stability of.Traction control is designed to avoid the car wheels slip When we want to accelerate the racing car.According to the selected slip rate range,three different torque adjustment algorithms are designed to adjust the driving torque of the racing car.When the car is turning,a torque coordinated distribution control strategy based on direct yaw moment and vertical load is designed,and the additional yaw moment is calculated using the yaw rate of the linear two-degree-of-freedom vehicle reference model as the control variable.According to the vertical load and additional yaw moment of the front and rear axles,the additional torque of the four drive motors is allocated to ensure that the car has good lateral stability when turning.Finally,CarSim-Simulink build simulation models to do co-simulation.There are four scenarios for the simulation experiment project.Including Accelerated testing,the Double Lane Changes testing,the Skidpad testing and Autocross testing.Experiments show that the control strategy to coordinate the distribution of drive torque This design not only ensure that the car has good driving stability,but also to make good acceleration performance.