Abstract: In order to provide accurate information of vehicle rollover timely, a vehicle rollover warning algorithm based on the dynamic stability is presented. Taking the tire cornering properties influenced by roll casting, roll steering and suspension deformation into consideration, a multiple degrees of freedom model of vehicle rollover is established. From the theory of vehicle rollover and Routh-Hurwitz stability criterion, the physical constraint and stability of steady state motion of vehicle rollover are obtained. Then a dynamic stability rollover indicator is put forward to design the vehicle rollover warning algorithm. Also, some numerical simulations are given for a sport utility vehicle rollover in typical cases. The results show that this algorithm can accurately obtain the time-to-rollover(TTR) in super real time, increase the precision of TTR in dynamic rollover, reduce the times of false alarming for rollover risk, and improve active safety for vehicle anti-rollover.

Key words: Dynamic stability, Rollover warning, Vehicle active safety, Vehicle rollover