| With the development of the highway,and the performance is improved contantly,the avergaer speed of vehicle is more and more higher,in all traffic accidents,vehicle rollover accient causes loss of lives and property of the major traffic after the collision.Because of a unique configuration for electric wheel drive vehicles,studying on the roll stability of electric wheel is the prerequisite and basis of the proposed effective anti-rollover control method.Which is of important theoretical and engineering value for improving the active safety of such vehicles.Firstly,the tread model of tire is studied in this paper,and the inclusion characteristics of the tire is analyzed.then the effective road surface is solved.Secondly,the tire model is modeled as a rigid ring model,the tire model is divided into a tread model and a carcass model,the tread model is connected to the carcass model by a tread spring,the road surface is modeled as equivalent road surface because of the inclusion characteristic,it was analyzed that the higher the speed is,the greater the load is,the higher the bump is,the greater the vertical force of tire is.The rigid ring model is then combined with the suspension model in the complete vehicle model,a pavement model with bumps,a mcpherson front suspension model,a torsion beam rear suspension model,and a body model are set up,and the electric wheel model is combined to establish the multi-dimensional nonlinear dynamic coupling model.The model is simulated by Simulink software,finally,in each movement state,the impact laws of various factors on the vehicle in the process of driving through the obstacles are discussed,the LTR lateral load transfer rate is used as the basis for judging the rollover warning,and to determine the threshold value when the side of the wheel starts off the ground of various motion forms,it is concluded that the higher the speed is,the higher the corner is,the higher the bump is,the heavier the wheel is,the worse the roll stability. |
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