Stability Control Of Distributed Driven Vehicle After Tire Blow-out

During the high speed driving,it's very dangerous for the car to have a tire blow-out.The common situation after the tire blow-out is that the vehicle bumps into the traffic facilities or other vehicles,if the rim of the car bump into the road it may leads to the rollover,which will cause huge loss of property and even harm the safety of human life.Therefore,most of the automobile OEMS gradually equip the cars with the tire pressure monitoring system,to warn the abnormal condition of tire pressure and tire temperature.Besides it is necessary to establish a vehicle active safety control system for the situation of tire blow-out,in order to keep the car's stability with the help of several actuators.Based on the research of other scholars,this paper carries out further exploration of tire blow-out.This paper uses FWID EV(Four Wheel Independent Driving Electric Vehicle)as a platform to do the research for tire blow-out,aiming to make full use of the advantages of the FWID EV.The full text focuses on the modeling of blown-up tire,the modeling of tire blowout vehicle,the dynamic response of the car after tire blow-out,and the stability control of the vehicle after tire blow-out.The full paper includes the following parts:1)The mechanical characteristics of tire blow-out tire were studied,and the model of such tire was established.The change of the tire parameters before and after the tire blow-out is compared and analyzed,and the vehicle dynamic response that influence by the change of tire and vehicle's parameters after the tire blow-up is discussed.2)The dynamic model of the vehicle after tire blow-out is described in detail,including the tire lateral force,the longitudinal force,and the additional yaw torque caused by the lateral force and the longitudinal force.The "brake effect of blow-out tire" caused by the longitudinal force and the “rollover effect of blow-out tire” caused by the lateral force is introduced.3)The vehicle model and the blow-out tire model was set up by using CarSim.The simulation of vehicle blowout has been carried out in various working conditions,including the front/rear tire blow out when the car driving straight,the outside front/rear tire blow out tire blow out when the car steering,and the inside front/rear tire blow out tire blow out when the car steering.The dynamic response of the vehicle under the control of an inexperienced driver after tire blow-out is considered,and it is demonstrated that the inexperienced driver's wrong operation will leads to the instability of the vehicle.4)A monitoring method of indirect tire burst based on wheel speed is designed.Taking the DYC(direct yaw moment control)as the core idea,an equal torque allocation control strategy based on distributed drive is proposed,and the fuzzy control algorithm is used for feedback control.The control strategy of equal torque distribution and the fuzzy control algorithm are constructed,and the stability controller of the whole vehicle is constructed.The stability control of the vehicle at different working condition has been simulated.The results show that the controller and the control strategy have excellent results.5)The active brake system after tire blow-out is designed.After the stability control of the blowout vehicle,the brake operation is carried out,and the stability controller of the tire blowout continues to work in the process of braking.The simulation result shows that the coordinated control of active braking system and stability controller can slow down the vehicle slowly until the tire burst is stable.6)A FWIA EV experiment platform is made and the platform can support most of the vehicle dynamics experiments.The platform is equipped with active steering system,and the motor controller can implement electronic brakes,so the platform can also support the research of intelligent driving.The main innovations of this article are as follows:1)The "rollover effect of blow-out tire" is put forward,and the influence of tire lateral force on the dynamic response of tire blowout is analyzed in detail.2)Other scholars have proposed that the wrong operation of the inexperienced drivers after the blowout will lead to the instability of the vehicle,but most of which have not been demonstrated.In this paper,a single point preview driver model is set up to make the driver operate at high speed and emergency with poor driving ability,and this view is demonstrated with CarSim/Simulink's simulation.3)A control strategy for tire blow-out based on distributed driving is proposed.Most of the control methods of other scholars are realized by differential braking.The distributed drive control strategy is different from the differential brake,and its control is more accurate and efficient,and it avoids the potential danger that the excessive brake may cause further instability of the vehicle.4)Most of the study has achieved stability control after the vehicle blowout,but the vehicle still maintains a high speed,which is unsafe.In this paper,the active braking system of the blowout vehicle is designed.After the control of the stability of the vehicle,the braking operation of the vehicle is carried out,and the vehicle is changed from high speed to stop.