Modeling And Stability Control Of The Vehicle With Tire Blow-out

With the development of our national pavement construction as well as the increaseof automobile quantities, the traffic safety has become a common problem in our dailylife. The attribution of tire blow-out to a variety of traffic accidents is increasing yearby year. Especially for circumstances on a highway, tire blow-out has been consideredas one of the significant causes leading to varieties of severe traffic accidents, whichmay cause utmost damage to the life and property safety of people.The radial and shear characteristics change sharply when a tire blows out. Thesechanges may bring serious effects on the maneuvering ability and stability of a vehi-cle. Moreover, interferences caused by these changes may easily make the driver toconduct improper manipulations which will make things worsen. Thus it is very signi-ficant in theory and practical engineering to analyse the tire blow-out.Notice that there is still a few reseaches on modeling and dynamics of vehicle withtire blow-out. Our emphases are played on the modeling of the blown-out tire,modeling of whole car when its tire blows out and the stability control to a car withtire blow-out. The work is summarized as follows:(1) Mathmetical model is estabilished by simplifying tire to be a series of springsystem, to reflect changes in radial characteristics when tire blows out. The model canintuitively and correctly reflect the blown-out course.(2) The shear mechanical properties of the blown-out tire are modeled usingUA-Tire theory model, which may effectively weaken the dependency to experimentsof a deflated tire. The mechanical properties after the rim touches the ground are alsosimulated by changing some parameters in the UA-Tire model. The correctness andpractical applicability are implemented through loading the blown-out tire model intoCarsim software. Furthermore, vehicle dynamic responses under considering somedriver manipulations after tire blow-out are also analysed briefly in the same way.(3) Combining the blown-out tire model, a14-DOF whole car model is establishedbased on the Newton’s second law using Matlab/Simulink. The model is also verifiedby comparing the simulation results with Carsim model under straight and curve driveconditions. The absolute coordinate is adopted to establish the ride model, so that thesimulation can intuitively show the vehicle attitude changes when a tire blow-outtakes place.(4) The motions of a car with tire blow-out under straight and curve drive conditions are investigated with the aid of the proposed whole-vehicle model. Thosemotion tendencies in different circumstances are also analysed by studying theparameter changes and mutual influences using the proposed model. The results showthat the model can be very useful to do such analytical works.(5) The fundamental ideology of stability control system to a car with tire blow-outis analysed. Then, a fuzzy controller is proposed to replace the common LinearQuadratic Regulator (LQR) to calculate the additional yaw moment. The controlprocess is effectively simplified by using the fuzzy controller. Finally, the controlleris verified by a cosimulation of Simulink and Carsim, and the results show thecontroller can play a positive role to the car stability.