GAC Automotive Research & Development Center, China-Bo Wang, Hongshan Zha, Guoqi Zhong, Shijing Weng, Qin Li
Jilin University, China-Pingping Lu
by SAE International in United States
A new concept of instantaneous wheel turn center (IWTC) is proposed to evaluate and improve multi-axle vehicle steering coordination performance. The concept of IWTC and its calculation method are studied. The index named dispersion of IWTC is developed to evaluate the vehicle steering coordination performance quantitatively. The simulation tests based on a three-axle off-road vehicle model are conducted under different vehicle velocities and lateral accelerations. The simulation results show that the turn centers of different wheels are disperse, and the dispersion becomes larger with the increase of vehicle velocities and lateral acceleration. Since suspension has important influences on vehicle steering performance, the genetic algorithm is used to optimize the suspension hard points and bushing stiffness, aiming at minimizing the dispersion of wheel turn centers (DWTC) to improve the vehicle steering coordination performance. The optimization results indicate that the suspension optimization can effectively reduce the DWTC and improve the vehicle steering coordination performance. The proposed wheel turn center method provides an index and tool for the suspension design and optimization in the pre-development phase of the…
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